File: | clang/lib/Sema/SemaDeclCXX.cpp |
Warning: | line 5533, column 56 Called C++ object pointer is null |
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1 | //===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// | |||
2 | // | |||
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | |||
4 | // See https://llvm.org/LICENSE.txt for license information. | |||
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | |||
6 | // | |||
7 | //===----------------------------------------------------------------------===// | |||
8 | // | |||
9 | // This file implements semantic analysis for C++ declarations. | |||
10 | // | |||
11 | //===----------------------------------------------------------------------===// | |||
12 | ||||
13 | #include "clang/AST/ASTConsumer.h" | |||
14 | #include "clang/AST/ASTContext.h" | |||
15 | #include "clang/AST/ASTLambda.h" | |||
16 | #include "clang/AST/ASTMutationListener.h" | |||
17 | #include "clang/AST/CXXInheritance.h" | |||
18 | #include "clang/AST/CharUnits.h" | |||
19 | #include "clang/AST/ComparisonCategories.h" | |||
20 | #include "clang/AST/EvaluatedExprVisitor.h" | |||
21 | #include "clang/AST/ExprCXX.h" | |||
22 | #include "clang/AST/RecordLayout.h" | |||
23 | #include "clang/AST/RecursiveASTVisitor.h" | |||
24 | #include "clang/AST/StmtVisitor.h" | |||
25 | #include "clang/AST/TypeLoc.h" | |||
26 | #include "clang/AST/TypeOrdering.h" | |||
27 | #include "clang/Basic/AttributeCommonInfo.h" | |||
28 | #include "clang/Basic/PartialDiagnostic.h" | |||
29 | #include "clang/Basic/TargetInfo.h" | |||
30 | #include "clang/Lex/LiteralSupport.h" | |||
31 | #include "clang/Lex/Preprocessor.h" | |||
32 | #include "clang/Sema/CXXFieldCollector.h" | |||
33 | #include "clang/Sema/DeclSpec.h" | |||
34 | #include "clang/Sema/Initialization.h" | |||
35 | #include "clang/Sema/Lookup.h" | |||
36 | #include "clang/Sema/ParsedTemplate.h" | |||
37 | #include "clang/Sema/Scope.h" | |||
38 | #include "clang/Sema/ScopeInfo.h" | |||
39 | #include "clang/Sema/SemaInternal.h" | |||
40 | #include "clang/Sema/Template.h" | |||
41 | #include "llvm/ADT/ScopeExit.h" | |||
42 | #include "llvm/ADT/SmallString.h" | |||
43 | #include "llvm/ADT/STLExtras.h" | |||
44 | #include "llvm/ADT/StringExtras.h" | |||
45 | #include <map> | |||
46 | #include <set> | |||
47 | ||||
48 | using namespace clang; | |||
49 | ||||
50 | //===----------------------------------------------------------------------===// | |||
51 | // CheckDefaultArgumentVisitor | |||
52 | //===----------------------------------------------------------------------===// | |||
53 | ||||
54 | namespace { | |||
55 | /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses | |||
56 | /// the default argument of a parameter to determine whether it | |||
57 | /// contains any ill-formed subexpressions. For example, this will | |||
58 | /// diagnose the use of local variables or parameters within the | |||
59 | /// default argument expression. | |||
60 | class CheckDefaultArgumentVisitor | |||
61 | : public ConstStmtVisitor<CheckDefaultArgumentVisitor, bool> { | |||
62 | Sema &S; | |||
63 | const Expr *DefaultArg; | |||
64 | ||||
65 | public: | |||
66 | CheckDefaultArgumentVisitor(Sema &S, const Expr *DefaultArg) | |||
67 | : S(S), DefaultArg(DefaultArg) {} | |||
68 | ||||
69 | bool VisitExpr(const Expr *Node); | |||
70 | bool VisitDeclRefExpr(const DeclRefExpr *DRE); | |||
71 | bool VisitCXXThisExpr(const CXXThisExpr *ThisE); | |||
72 | bool VisitLambdaExpr(const LambdaExpr *Lambda); | |||
73 | bool VisitPseudoObjectExpr(const PseudoObjectExpr *POE); | |||
74 | }; | |||
75 | ||||
76 | /// VisitExpr - Visit all of the children of this expression. | |||
77 | bool CheckDefaultArgumentVisitor::VisitExpr(const Expr *Node) { | |||
78 | bool IsInvalid = false; | |||
79 | for (const Stmt *SubStmt : Node->children()) | |||
80 | IsInvalid |= Visit(SubStmt); | |||
81 | return IsInvalid; | |||
82 | } | |||
83 | ||||
84 | /// VisitDeclRefExpr - Visit a reference to a declaration, to | |||
85 | /// determine whether this declaration can be used in the default | |||
86 | /// argument expression. | |||
87 | bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(const DeclRefExpr *DRE) { | |||
88 | const NamedDecl *Decl = DRE->getDecl(); | |||
89 | if (const auto *Param = dyn_cast<ParmVarDecl>(Decl)) { | |||
90 | // C++ [dcl.fct.default]p9: | |||
91 | // [...] parameters of a function shall not be used in default | |||
92 | // argument expressions, even if they are not evaluated. [...] | |||
93 | // | |||
94 | // C++17 [dcl.fct.default]p9 (by CWG 2082): | |||
95 | // [...] A parameter shall not appear as a potentially-evaluated | |||
96 | // expression in a default argument. [...] | |||
97 | // | |||
98 | if (DRE->isNonOdrUse() != NOUR_Unevaluated) | |||
99 | return S.Diag(DRE->getBeginLoc(), | |||
100 | diag::err_param_default_argument_references_param) | |||
101 | << Param->getDeclName() << DefaultArg->getSourceRange(); | |||
102 | } else if (const auto *VDecl = dyn_cast<VarDecl>(Decl)) { | |||
103 | // C++ [dcl.fct.default]p7: | |||
104 | // Local variables shall not be used in default argument | |||
105 | // expressions. | |||
106 | // | |||
107 | // C++17 [dcl.fct.default]p7 (by CWG 2082): | |||
108 | // A local variable shall not appear as a potentially-evaluated | |||
109 | // expression in a default argument. | |||
110 | // | |||
111 | // C++20 [dcl.fct.default]p7 (DR as part of P0588R1, see also CWG 2346): | |||
112 | // Note: A local variable cannot be odr-used (6.3) in a default argument. | |||
113 | // | |||
114 | if (VDecl->isLocalVarDecl() && !DRE->isNonOdrUse()) | |||
115 | return S.Diag(DRE->getBeginLoc(), | |||
116 | diag::err_param_default_argument_references_local) | |||
117 | << VDecl->getDeclName() << DefaultArg->getSourceRange(); | |||
118 | } | |||
119 | ||||
120 | return false; | |||
121 | } | |||
122 | ||||
123 | /// VisitCXXThisExpr - Visit a C++ "this" expression. | |||
124 | bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(const CXXThisExpr *ThisE) { | |||
125 | // C++ [dcl.fct.default]p8: | |||
126 | // The keyword this shall not be used in a default argument of a | |||
127 | // member function. | |||
128 | return S.Diag(ThisE->getBeginLoc(), | |||
129 | diag::err_param_default_argument_references_this) | |||
130 | << ThisE->getSourceRange(); | |||
131 | } | |||
132 | ||||
133 | bool CheckDefaultArgumentVisitor::VisitPseudoObjectExpr( | |||
134 | const PseudoObjectExpr *POE) { | |||
135 | bool Invalid = false; | |||
136 | for (const Expr *E : POE->semantics()) { | |||
137 | // Look through bindings. | |||
138 | if (const auto *OVE = dyn_cast<OpaqueValueExpr>(E)) { | |||
139 | E = OVE->getSourceExpr(); | |||
140 | assert(E && "pseudo-object binding without source expression?")((E && "pseudo-object binding without source expression?" ) ? static_cast<void> (0) : __assert_fail ("E && \"pseudo-object binding without source expression?\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 140, __PRETTY_FUNCTION__)); | |||
141 | } | |||
142 | ||||
143 | Invalid |= Visit(E); | |||
144 | } | |||
145 | return Invalid; | |||
146 | } | |||
147 | ||||
148 | bool CheckDefaultArgumentVisitor::VisitLambdaExpr(const LambdaExpr *Lambda) { | |||
149 | // C++11 [expr.lambda.prim]p13: | |||
150 | // A lambda-expression appearing in a default argument shall not | |||
151 | // implicitly or explicitly capture any entity. | |||
152 | if (Lambda->capture_begin() == Lambda->capture_end()) | |||
153 | return false; | |||
154 | ||||
155 | return S.Diag(Lambda->getBeginLoc(), diag::err_lambda_capture_default_arg); | |||
156 | } | |||
157 | } // namespace | |||
158 | ||||
159 | void | |||
160 | Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, | |||
161 | const CXXMethodDecl *Method) { | |||
162 | // If we have an MSAny spec already, don't bother. | |||
163 | if (!Method || ComputedEST == EST_MSAny) | |||
164 | return; | |||
165 | ||||
166 | const FunctionProtoType *Proto | |||
167 | = Method->getType()->getAs<FunctionProtoType>(); | |||
168 | Proto = Self->ResolveExceptionSpec(CallLoc, Proto); | |||
169 | if (!Proto) | |||
170 | return; | |||
171 | ||||
172 | ExceptionSpecificationType EST = Proto->getExceptionSpecType(); | |||
173 | ||||
174 | // If we have a throw-all spec at this point, ignore the function. | |||
175 | if (ComputedEST == EST_None) | |||
176 | return; | |||
177 | ||||
178 | if (EST == EST_None && Method->hasAttr<NoThrowAttr>()) | |||
179 | EST = EST_BasicNoexcept; | |||
180 | ||||
181 | switch (EST) { | |||
182 | case EST_Unparsed: | |||
183 | case EST_Uninstantiated: | |||
184 | case EST_Unevaluated: | |||
185 | llvm_unreachable("should not see unresolved exception specs here")::llvm::llvm_unreachable_internal("should not see unresolved exception specs here" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 185); | |||
186 | ||||
187 | // If this function can throw any exceptions, make a note of that. | |||
188 | case EST_MSAny: | |||
189 | case EST_None: | |||
190 | // FIXME: Whichever we see last of MSAny and None determines our result. | |||
191 | // We should make a consistent, order-independent choice here. | |||
192 | ClearExceptions(); | |||
193 | ComputedEST = EST; | |||
194 | return; | |||
195 | case EST_NoexceptFalse: | |||
196 | ClearExceptions(); | |||
197 | ComputedEST = EST_None; | |||
198 | return; | |||
199 | // FIXME: If the call to this decl is using any of its default arguments, we | |||
200 | // need to search them for potentially-throwing calls. | |||
201 | // If this function has a basic noexcept, it doesn't affect the outcome. | |||
202 | case EST_BasicNoexcept: | |||
203 | case EST_NoexceptTrue: | |||
204 | case EST_NoThrow: | |||
205 | return; | |||
206 | // If we're still at noexcept(true) and there's a throw() callee, | |||
207 | // change to that specification. | |||
208 | case EST_DynamicNone: | |||
209 | if (ComputedEST == EST_BasicNoexcept) | |||
210 | ComputedEST = EST_DynamicNone; | |||
211 | return; | |||
212 | case EST_DependentNoexcept: | |||
213 | llvm_unreachable(::llvm::llvm_unreachable_internal("should not generate implicit declarations for dependent cases" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 214) | |||
214 | "should not generate implicit declarations for dependent cases")::llvm::llvm_unreachable_internal("should not generate implicit declarations for dependent cases" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 214); | |||
215 | case EST_Dynamic: | |||
216 | break; | |||
217 | } | |||
218 | assert(EST == EST_Dynamic && "EST case not considered earlier.")((EST == EST_Dynamic && "EST case not considered earlier." ) ? static_cast<void> (0) : __assert_fail ("EST == EST_Dynamic && \"EST case not considered earlier.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 218, __PRETTY_FUNCTION__)); | |||
219 | assert(ComputedEST != EST_None &&((ComputedEST != EST_None && "Shouldn't collect exceptions when throw-all is guaranteed." ) ? static_cast<void> (0) : __assert_fail ("ComputedEST != EST_None && \"Shouldn't collect exceptions when throw-all is guaranteed.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 220, __PRETTY_FUNCTION__)) | |||
220 | "Shouldn't collect exceptions when throw-all is guaranteed.")((ComputedEST != EST_None && "Shouldn't collect exceptions when throw-all is guaranteed." ) ? static_cast<void> (0) : __assert_fail ("ComputedEST != EST_None && \"Shouldn't collect exceptions when throw-all is guaranteed.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 220, __PRETTY_FUNCTION__)); | |||
221 | ComputedEST = EST_Dynamic; | |||
222 | // Record the exceptions in this function's exception specification. | |||
223 | for (const auto &E : Proto->exceptions()) | |||
224 | if (ExceptionsSeen.insert(Self->Context.getCanonicalType(E)).second) | |||
225 | Exceptions.push_back(E); | |||
226 | } | |||
227 | ||||
228 | void Sema::ImplicitExceptionSpecification::CalledStmt(Stmt *S) { | |||
229 | if (!S || ComputedEST == EST_MSAny) | |||
230 | return; | |||
231 | ||||
232 | // FIXME: | |||
233 | // | |||
234 | // C++0x [except.spec]p14: | |||
235 | // [An] implicit exception-specification specifies the type-id T if and | |||
236 | // only if T is allowed by the exception-specification of a function directly | |||
237 | // invoked by f's implicit definition; f shall allow all exceptions if any | |||
238 | // function it directly invokes allows all exceptions, and f shall allow no | |||
239 | // exceptions if every function it directly invokes allows no exceptions. | |||
240 | // | |||
241 | // Note in particular that if an implicit exception-specification is generated | |||
242 | // for a function containing a throw-expression, that specification can still | |||
243 | // be noexcept(true). | |||
244 | // | |||
245 | // Note also that 'directly invoked' is not defined in the standard, and there | |||
246 | // is no indication that we should only consider potentially-evaluated calls. | |||
247 | // | |||
248 | // Ultimately we should implement the intent of the standard: the exception | |||
249 | // specification should be the set of exceptions which can be thrown by the | |||
250 | // implicit definition. For now, we assume that any non-nothrow expression can | |||
251 | // throw any exception. | |||
252 | ||||
253 | if (Self->canThrow(S)) | |||
254 | ComputedEST = EST_None; | |||
255 | } | |||
256 | ||||
257 | ExprResult Sema::ConvertParamDefaultArgument(const ParmVarDecl *Param, | |||
258 | Expr *Arg, | |||
259 | SourceLocation EqualLoc) { | |||
260 | if (RequireCompleteType(Param->getLocation(), Param->getType(), | |||
261 | diag::err_typecheck_decl_incomplete_type)) | |||
262 | return true; | |||
263 | ||||
264 | // C++ [dcl.fct.default]p5 | |||
265 | // A default argument expression is implicitly converted (clause | |||
266 | // 4) to the parameter type. The default argument expression has | |||
267 | // the same semantic constraints as the initializer expression in | |||
268 | // a declaration of a variable of the parameter type, using the | |||
269 | // copy-initialization semantics (8.5). | |||
270 | InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, | |||
271 | Param); | |||
272 | InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), | |||
273 | EqualLoc); | |||
274 | InitializationSequence InitSeq(*this, Entity, Kind, Arg); | |||
275 | ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); | |||
276 | if (Result.isInvalid()) | |||
277 | return true; | |||
278 | Arg = Result.getAs<Expr>(); | |||
279 | ||||
280 | CheckCompletedExpr(Arg, EqualLoc); | |||
281 | Arg = MaybeCreateExprWithCleanups(Arg); | |||
282 | ||||
283 | return Arg; | |||
284 | } | |||
285 | ||||
286 | void Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, | |||
287 | SourceLocation EqualLoc) { | |||
288 | // Add the default argument to the parameter | |||
289 | Param->setDefaultArg(Arg); | |||
290 | ||||
291 | // We have already instantiated this parameter; provide each of the | |||
292 | // instantiations with the uninstantiated default argument. | |||
293 | UnparsedDefaultArgInstantiationsMap::iterator InstPos | |||
294 | = UnparsedDefaultArgInstantiations.find(Param); | |||
295 | if (InstPos != UnparsedDefaultArgInstantiations.end()) { | |||
296 | for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) | |||
297 | InstPos->second[I]->setUninstantiatedDefaultArg(Arg); | |||
298 | ||||
299 | // We're done tracking this parameter's instantiations. | |||
300 | UnparsedDefaultArgInstantiations.erase(InstPos); | |||
301 | } | |||
302 | } | |||
303 | ||||
304 | /// ActOnParamDefaultArgument - Check whether the default argument | |||
305 | /// provided for a function parameter is well-formed. If so, attach it | |||
306 | /// to the parameter declaration. | |||
307 | void | |||
308 | Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, | |||
309 | Expr *DefaultArg) { | |||
310 | if (!param || !DefaultArg) | |||
311 | return; | |||
312 | ||||
313 | ParmVarDecl *Param = cast<ParmVarDecl>(param); | |||
314 | UnparsedDefaultArgLocs.erase(Param); | |||
315 | ||||
316 | auto Fail = [&] { | |||
317 | Param->setInvalidDecl(); | |||
318 | Param->setDefaultArg(new (Context) OpaqueValueExpr( | |||
319 | EqualLoc, Param->getType().getNonReferenceType(), VK_RValue)); | |||
320 | }; | |||
321 | ||||
322 | // Default arguments are only permitted in C++ | |||
323 | if (!getLangOpts().CPlusPlus) { | |||
324 | Diag(EqualLoc, diag::err_param_default_argument) | |||
325 | << DefaultArg->getSourceRange(); | |||
326 | return Fail(); | |||
327 | } | |||
328 | ||||
329 | // Check for unexpanded parameter packs. | |||
330 | if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { | |||
331 | return Fail(); | |||
332 | } | |||
333 | ||||
334 | // C++11 [dcl.fct.default]p3 | |||
335 | // A default argument expression [...] shall not be specified for a | |||
336 | // parameter pack. | |||
337 | if (Param->isParameterPack()) { | |||
338 | Diag(EqualLoc, diag::err_param_default_argument_on_parameter_pack) | |||
339 | << DefaultArg->getSourceRange(); | |||
340 | // Recover by discarding the default argument. | |||
341 | Param->setDefaultArg(nullptr); | |||
342 | return; | |||
343 | } | |||
344 | ||||
345 | ExprResult Result = ConvertParamDefaultArgument(Param, DefaultArg, EqualLoc); | |||
346 | if (Result.isInvalid()) | |||
347 | return Fail(); | |||
348 | ||||
349 | DefaultArg = Result.getAs<Expr>(); | |||
350 | ||||
351 | // Check that the default argument is well-formed | |||
352 | CheckDefaultArgumentVisitor DefaultArgChecker(*this, DefaultArg); | |||
353 | if (DefaultArgChecker.Visit(DefaultArg)) | |||
354 | return Fail(); | |||
355 | ||||
356 | SetParamDefaultArgument(Param, DefaultArg, EqualLoc); | |||
357 | } | |||
358 | ||||
359 | /// ActOnParamUnparsedDefaultArgument - We've seen a default | |||
360 | /// argument for a function parameter, but we can't parse it yet | |||
361 | /// because we're inside a class definition. Note that this default | |||
362 | /// argument will be parsed later. | |||
363 | void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, | |||
364 | SourceLocation EqualLoc, | |||
365 | SourceLocation ArgLoc) { | |||
366 | if (!param) | |||
367 | return; | |||
368 | ||||
369 | ParmVarDecl *Param = cast<ParmVarDecl>(param); | |||
370 | Param->setUnparsedDefaultArg(); | |||
371 | UnparsedDefaultArgLocs[Param] = ArgLoc; | |||
372 | } | |||
373 | ||||
374 | /// ActOnParamDefaultArgumentError - Parsing or semantic analysis of | |||
375 | /// the default argument for the parameter param failed. | |||
376 | void Sema::ActOnParamDefaultArgumentError(Decl *param, | |||
377 | SourceLocation EqualLoc) { | |||
378 | if (!param) | |||
379 | return; | |||
380 | ||||
381 | ParmVarDecl *Param = cast<ParmVarDecl>(param); | |||
382 | Param->setInvalidDecl(); | |||
383 | UnparsedDefaultArgLocs.erase(Param); | |||
384 | Param->setDefaultArg(new(Context) | |||
385 | OpaqueValueExpr(EqualLoc, | |||
386 | Param->getType().getNonReferenceType(), | |||
387 | VK_RValue)); | |||
388 | } | |||
389 | ||||
390 | /// CheckExtraCXXDefaultArguments - Check for any extra default | |||
391 | /// arguments in the declarator, which is not a function declaration | |||
392 | /// or definition and therefore is not permitted to have default | |||
393 | /// arguments. This routine should be invoked for every declarator | |||
394 | /// that is not a function declaration or definition. | |||
395 | void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { | |||
396 | // C++ [dcl.fct.default]p3 | |||
397 | // A default argument expression shall be specified only in the | |||
398 | // parameter-declaration-clause of a function declaration or in a | |||
399 | // template-parameter (14.1). It shall not be specified for a | |||
400 | // parameter pack. If it is specified in a | |||
401 | // parameter-declaration-clause, it shall not occur within a | |||
402 | // declarator or abstract-declarator of a parameter-declaration. | |||
403 | bool MightBeFunction = D.isFunctionDeclarationContext(); | |||
404 | for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { | |||
405 | DeclaratorChunk &chunk = D.getTypeObject(i); | |||
406 | if (chunk.Kind == DeclaratorChunk::Function) { | |||
407 | if (MightBeFunction) { | |||
408 | // This is a function declaration. It can have default arguments, but | |||
409 | // keep looking in case its return type is a function type with default | |||
410 | // arguments. | |||
411 | MightBeFunction = false; | |||
412 | continue; | |||
413 | } | |||
414 | for (unsigned argIdx = 0, e = chunk.Fun.NumParams; argIdx != e; | |||
415 | ++argIdx) { | |||
416 | ParmVarDecl *Param = cast<ParmVarDecl>(chunk.Fun.Params[argIdx].Param); | |||
417 | if (Param->hasUnparsedDefaultArg()) { | |||
418 | std::unique_ptr<CachedTokens> Toks = | |||
419 | std::move(chunk.Fun.Params[argIdx].DefaultArgTokens); | |||
420 | SourceRange SR; | |||
421 | if (Toks->size() > 1) | |||
422 | SR = SourceRange((*Toks)[1].getLocation(), | |||
423 | Toks->back().getLocation()); | |||
424 | else | |||
425 | SR = UnparsedDefaultArgLocs[Param]; | |||
426 | Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) | |||
427 | << SR; | |||
428 | } else if (Param->getDefaultArg()) { | |||
429 | Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) | |||
430 | << Param->getDefaultArg()->getSourceRange(); | |||
431 | Param->setDefaultArg(nullptr); | |||
432 | } | |||
433 | } | |||
434 | } else if (chunk.Kind != DeclaratorChunk::Paren) { | |||
435 | MightBeFunction = false; | |||
436 | } | |||
437 | } | |||
438 | } | |||
439 | ||||
440 | static bool functionDeclHasDefaultArgument(const FunctionDecl *FD) { | |||
441 | return std::any_of(FD->param_begin(), FD->param_end(), [](ParmVarDecl *P) { | |||
442 | return P->hasDefaultArg() && !P->hasInheritedDefaultArg(); | |||
443 | }); | |||
444 | } | |||
445 | ||||
446 | /// MergeCXXFunctionDecl - Merge two declarations of the same C++ | |||
447 | /// function, once we already know that they have the same | |||
448 | /// type. Subroutine of MergeFunctionDecl. Returns true if there was an | |||
449 | /// error, false otherwise. | |||
450 | bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, | |||
451 | Scope *S) { | |||
452 | bool Invalid = false; | |||
453 | ||||
454 | // The declaration context corresponding to the scope is the semantic | |||
455 | // parent, unless this is a local function declaration, in which case | |||
456 | // it is that surrounding function. | |||
457 | DeclContext *ScopeDC = New->isLocalExternDecl() | |||
458 | ? New->getLexicalDeclContext() | |||
459 | : New->getDeclContext(); | |||
460 | ||||
461 | // Find the previous declaration for the purpose of default arguments. | |||
462 | FunctionDecl *PrevForDefaultArgs = Old; | |||
463 | for (/**/; PrevForDefaultArgs; | |||
464 | // Don't bother looking back past the latest decl if this is a local | |||
465 | // extern declaration; nothing else could work. | |||
466 | PrevForDefaultArgs = New->isLocalExternDecl() | |||
467 | ? nullptr | |||
468 | : PrevForDefaultArgs->getPreviousDecl()) { | |||
469 | // Ignore hidden declarations. | |||
470 | if (!LookupResult::isVisible(*this, PrevForDefaultArgs)) | |||
471 | continue; | |||
472 | ||||
473 | if (S && !isDeclInScope(PrevForDefaultArgs, ScopeDC, S) && | |||
474 | !New->isCXXClassMember()) { | |||
475 | // Ignore default arguments of old decl if they are not in | |||
476 | // the same scope and this is not an out-of-line definition of | |||
477 | // a member function. | |||
478 | continue; | |||
479 | } | |||
480 | ||||
481 | if (PrevForDefaultArgs->isLocalExternDecl() != New->isLocalExternDecl()) { | |||
482 | // If only one of these is a local function declaration, then they are | |||
483 | // declared in different scopes, even though isDeclInScope may think | |||
484 | // they're in the same scope. (If both are local, the scope check is | |||
485 | // sufficient, and if neither is local, then they are in the same scope.) | |||
486 | continue; | |||
487 | } | |||
488 | ||||
489 | // We found the right previous declaration. | |||
490 | break; | |||
491 | } | |||
492 | ||||
493 | // C++ [dcl.fct.default]p4: | |||
494 | // For non-template functions, default arguments can be added in | |||
495 | // later declarations of a function in the same | |||
496 | // scope. Declarations in different scopes have completely | |||
497 | // distinct sets of default arguments. That is, declarations in | |||
498 | // inner scopes do not acquire default arguments from | |||
499 | // declarations in outer scopes, and vice versa. In a given | |||
500 | // function declaration, all parameters subsequent to a | |||
501 | // parameter with a default argument shall have default | |||
502 | // arguments supplied in this or previous declarations. A | |||
503 | // default argument shall not be redefined by a later | |||
504 | // declaration (not even to the same value). | |||
505 | // | |||
506 | // C++ [dcl.fct.default]p6: | |||
507 | // Except for member functions of class templates, the default arguments | |||
508 | // in a member function definition that appears outside of the class | |||
509 | // definition are added to the set of default arguments provided by the | |||
510 | // member function declaration in the class definition. | |||
511 | for (unsigned p = 0, NumParams = PrevForDefaultArgs | |||
512 | ? PrevForDefaultArgs->getNumParams() | |||
513 | : 0; | |||
514 | p < NumParams; ++p) { | |||
515 | ParmVarDecl *OldParam = PrevForDefaultArgs->getParamDecl(p); | |||
516 | ParmVarDecl *NewParam = New->getParamDecl(p); | |||
517 | ||||
518 | bool OldParamHasDfl = OldParam ? OldParam->hasDefaultArg() : false; | |||
519 | bool NewParamHasDfl = NewParam->hasDefaultArg(); | |||
520 | ||||
521 | if (OldParamHasDfl && NewParamHasDfl) { | |||
522 | unsigned DiagDefaultParamID = | |||
523 | diag::err_param_default_argument_redefinition; | |||
524 | ||||
525 | // MSVC accepts that default parameters be redefined for member functions | |||
526 | // of template class. The new default parameter's value is ignored. | |||
527 | Invalid = true; | |||
528 | if (getLangOpts().MicrosoftExt) { | |||
529 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(New); | |||
530 | if (MD && MD->getParent()->getDescribedClassTemplate()) { | |||
531 | // Merge the old default argument into the new parameter. | |||
532 | NewParam->setHasInheritedDefaultArg(); | |||
533 | if (OldParam->hasUninstantiatedDefaultArg()) | |||
534 | NewParam->setUninstantiatedDefaultArg( | |||
535 | OldParam->getUninstantiatedDefaultArg()); | |||
536 | else | |||
537 | NewParam->setDefaultArg(OldParam->getInit()); | |||
538 | DiagDefaultParamID = diag::ext_param_default_argument_redefinition; | |||
539 | Invalid = false; | |||
540 | } | |||
541 | } | |||
542 | ||||
543 | // FIXME: If we knew where the '=' was, we could easily provide a fix-it | |||
544 | // hint here. Alternatively, we could walk the type-source information | |||
545 | // for NewParam to find the last source location in the type... but it | |||
546 | // isn't worth the effort right now. This is the kind of test case that | |||
547 | // is hard to get right: | |||
548 | // int f(int); | |||
549 | // void g(int (*fp)(int) = f); | |||
550 | // void g(int (*fp)(int) = &f); | |||
551 | Diag(NewParam->getLocation(), DiagDefaultParamID) | |||
552 | << NewParam->getDefaultArgRange(); | |||
553 | ||||
554 | // Look for the function declaration where the default argument was | |||
555 | // actually written, which may be a declaration prior to Old. | |||
556 | for (auto Older = PrevForDefaultArgs; | |||
557 | OldParam->hasInheritedDefaultArg(); /**/) { | |||
558 | Older = Older->getPreviousDecl(); | |||
559 | OldParam = Older->getParamDecl(p); | |||
560 | } | |||
561 | ||||
562 | Diag(OldParam->getLocation(), diag::note_previous_definition) | |||
563 | << OldParam->getDefaultArgRange(); | |||
564 | } else if (OldParamHasDfl) { | |||
565 | // Merge the old default argument into the new parameter unless the new | |||
566 | // function is a friend declaration in a template class. In the latter | |||
567 | // case the default arguments will be inherited when the friend | |||
568 | // declaration will be instantiated. | |||
569 | if (New->getFriendObjectKind() == Decl::FOK_None || | |||
570 | !New->getLexicalDeclContext()->isDependentContext()) { | |||
571 | // It's important to use getInit() here; getDefaultArg() | |||
572 | // strips off any top-level ExprWithCleanups. | |||
573 | NewParam->setHasInheritedDefaultArg(); | |||
574 | if (OldParam->hasUnparsedDefaultArg()) | |||
575 | NewParam->setUnparsedDefaultArg(); | |||
576 | else if (OldParam->hasUninstantiatedDefaultArg()) | |||
577 | NewParam->setUninstantiatedDefaultArg( | |||
578 | OldParam->getUninstantiatedDefaultArg()); | |||
579 | else | |||
580 | NewParam->setDefaultArg(OldParam->getInit()); | |||
581 | } | |||
582 | } else if (NewParamHasDfl) { | |||
583 | if (New->getDescribedFunctionTemplate()) { | |||
584 | // Paragraph 4, quoted above, only applies to non-template functions. | |||
585 | Diag(NewParam->getLocation(), | |||
586 | diag::err_param_default_argument_template_redecl) | |||
587 | << NewParam->getDefaultArgRange(); | |||
588 | Diag(PrevForDefaultArgs->getLocation(), | |||
589 | diag::note_template_prev_declaration) | |||
590 | << false; | |||
591 | } else if (New->getTemplateSpecializationKind() | |||
592 | != TSK_ImplicitInstantiation && | |||
593 | New->getTemplateSpecializationKind() != TSK_Undeclared) { | |||
594 | // C++ [temp.expr.spec]p21: | |||
595 | // Default function arguments shall not be specified in a declaration | |||
596 | // or a definition for one of the following explicit specializations: | |||
597 | // - the explicit specialization of a function template; | |||
598 | // - the explicit specialization of a member function template; | |||
599 | // - the explicit specialization of a member function of a class | |||
600 | // template where the class template specialization to which the | |||
601 | // member function specialization belongs is implicitly | |||
602 | // instantiated. | |||
603 | Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) | |||
604 | << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) | |||
605 | << New->getDeclName() | |||
606 | << NewParam->getDefaultArgRange(); | |||
607 | } else if (New->getDeclContext()->isDependentContext()) { | |||
608 | // C++ [dcl.fct.default]p6 (DR217): | |||
609 | // Default arguments for a member function of a class template shall | |||
610 | // be specified on the initial declaration of the member function | |||
611 | // within the class template. | |||
612 | // | |||
613 | // Reading the tea leaves a bit in DR217 and its reference to DR205 | |||
614 | // leads me to the conclusion that one cannot add default function | |||
615 | // arguments for an out-of-line definition of a member function of a | |||
616 | // dependent type. | |||
617 | int WhichKind = 2; | |||
618 | if (CXXRecordDecl *Record | |||
619 | = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { | |||
620 | if (Record->getDescribedClassTemplate()) | |||
621 | WhichKind = 0; | |||
622 | else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) | |||
623 | WhichKind = 1; | |||
624 | else | |||
625 | WhichKind = 2; | |||
626 | } | |||
627 | ||||
628 | Diag(NewParam->getLocation(), | |||
629 | diag::err_param_default_argument_member_template_redecl) | |||
630 | << WhichKind | |||
631 | << NewParam->getDefaultArgRange(); | |||
632 | } | |||
633 | } | |||
634 | } | |||
635 | ||||
636 | // DR1344: If a default argument is added outside a class definition and that | |||
637 | // default argument makes the function a special member function, the program | |||
638 | // is ill-formed. This can only happen for constructors. | |||
639 | if (isa<CXXConstructorDecl>(New) && | |||
640 | New->getMinRequiredArguments() < Old->getMinRequiredArguments()) { | |||
641 | CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)), | |||
642 | OldSM = getSpecialMember(cast<CXXMethodDecl>(Old)); | |||
643 | if (NewSM != OldSM) { | |||
644 | ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments()); | |||
645 | assert(NewParam->hasDefaultArg())((NewParam->hasDefaultArg()) ? static_cast<void> (0) : __assert_fail ("NewParam->hasDefaultArg()", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 645, __PRETTY_FUNCTION__)); | |||
646 | Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special) | |||
647 | << NewParam->getDefaultArgRange() << NewSM; | |||
648 | Diag(Old->getLocation(), diag::note_previous_declaration); | |||
649 | } | |||
650 | } | |||
651 | ||||
652 | const FunctionDecl *Def; | |||
653 | // C++11 [dcl.constexpr]p1: If any declaration of a function or function | |||
654 | // template has a constexpr specifier then all its declarations shall | |||
655 | // contain the constexpr specifier. | |||
656 | if (New->getConstexprKind() != Old->getConstexprKind()) { | |||
657 | Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) | |||
658 | << New << static_cast<int>(New->getConstexprKind()) | |||
659 | << static_cast<int>(Old->getConstexprKind()); | |||
660 | Diag(Old->getLocation(), diag::note_previous_declaration); | |||
661 | Invalid = true; | |||
662 | } else if (!Old->getMostRecentDecl()->isInlined() && New->isInlined() && | |||
663 | Old->isDefined(Def) && | |||
664 | // If a friend function is inlined but does not have 'inline' | |||
665 | // specifier, it is a definition. Do not report attribute conflict | |||
666 | // in this case, redefinition will be diagnosed later. | |||
667 | (New->isInlineSpecified() || | |||
668 | New->getFriendObjectKind() == Decl::FOK_None)) { | |||
669 | // C++11 [dcl.fcn.spec]p4: | |||
670 | // If the definition of a function appears in a translation unit before its | |||
671 | // first declaration as inline, the program is ill-formed. | |||
672 | Diag(New->getLocation(), diag::err_inline_decl_follows_def) << New; | |||
673 | Diag(Def->getLocation(), diag::note_previous_definition); | |||
674 | Invalid = true; | |||
675 | } | |||
676 | ||||
677 | // C++17 [temp.deduct.guide]p3: | |||
678 | // Two deduction guide declarations in the same translation unit | |||
679 | // for the same class template shall not have equivalent | |||
680 | // parameter-declaration-clauses. | |||
681 | if (isa<CXXDeductionGuideDecl>(New) && | |||
682 | !New->isFunctionTemplateSpecialization() && isVisible(Old)) { | |||
683 | Diag(New->getLocation(), diag::err_deduction_guide_redeclared); | |||
684 | Diag(Old->getLocation(), diag::note_previous_declaration); | |||
685 | } | |||
686 | ||||
687 | // C++11 [dcl.fct.default]p4: If a friend declaration specifies a default | |||
688 | // argument expression, that declaration shall be a definition and shall be | |||
689 | // the only declaration of the function or function template in the | |||
690 | // translation unit. | |||
691 | if (Old->getFriendObjectKind() == Decl::FOK_Undeclared && | |||
692 | functionDeclHasDefaultArgument(Old)) { | |||
693 | Diag(New->getLocation(), diag::err_friend_decl_with_def_arg_redeclared); | |||
694 | Diag(Old->getLocation(), diag::note_previous_declaration); | |||
695 | Invalid = true; | |||
696 | } | |||
697 | ||||
698 | // C++11 [temp.friend]p4 (DR329): | |||
699 | // When a function is defined in a friend function declaration in a class | |||
700 | // template, the function is instantiated when the function is odr-used. | |||
701 | // The same restrictions on multiple declarations and definitions that | |||
702 | // apply to non-template function declarations and definitions also apply | |||
703 | // to these implicit definitions. | |||
704 | const FunctionDecl *OldDefinition = nullptr; | |||
705 | if (New->isThisDeclarationInstantiatedFromAFriendDefinition() && | |||
706 | Old->isDefined(OldDefinition, true)) | |||
707 | CheckForFunctionRedefinition(New, OldDefinition); | |||
708 | ||||
709 | return Invalid; | |||
710 | } | |||
711 | ||||
712 | NamedDecl * | |||
713 | Sema::ActOnDecompositionDeclarator(Scope *S, Declarator &D, | |||
714 | MultiTemplateParamsArg TemplateParamLists) { | |||
715 | assert(D.isDecompositionDeclarator())((D.isDecompositionDeclarator()) ? static_cast<void> (0 ) : __assert_fail ("D.isDecompositionDeclarator()", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 715, __PRETTY_FUNCTION__)); | |||
716 | const DecompositionDeclarator &Decomp = D.getDecompositionDeclarator(); | |||
717 | ||||
718 | // The syntax only allows a decomposition declarator as a simple-declaration, | |||
719 | // a for-range-declaration, or a condition in Clang, but we parse it in more | |||
720 | // cases than that. | |||
721 | if (!D.mayHaveDecompositionDeclarator()) { | |||
722 | Diag(Decomp.getLSquareLoc(), diag::err_decomp_decl_context) | |||
723 | << Decomp.getSourceRange(); | |||
724 | return nullptr; | |||
725 | } | |||
726 | ||||
727 | if (!TemplateParamLists.empty()) { | |||
728 | // FIXME: There's no rule against this, but there are also no rules that | |||
729 | // would actually make it usable, so we reject it for now. | |||
730 | Diag(TemplateParamLists.front()->getTemplateLoc(), | |||
731 | diag::err_decomp_decl_template); | |||
732 | return nullptr; | |||
733 | } | |||
734 | ||||
735 | Diag(Decomp.getLSquareLoc(), | |||
736 | !getLangOpts().CPlusPlus17 | |||
737 | ? diag::ext_decomp_decl | |||
738 | : D.getContext() == DeclaratorContext::Condition | |||
739 | ? diag::ext_decomp_decl_cond | |||
740 | : diag::warn_cxx14_compat_decomp_decl) | |||
741 | << Decomp.getSourceRange(); | |||
742 | ||||
743 | // The semantic context is always just the current context. | |||
744 | DeclContext *const DC = CurContext; | |||
745 | ||||
746 | // C++17 [dcl.dcl]/8: | |||
747 | // The decl-specifier-seq shall contain only the type-specifier auto | |||
748 | // and cv-qualifiers. | |||
749 | // C++2a [dcl.dcl]/8: | |||
750 | // If decl-specifier-seq contains any decl-specifier other than static, | |||
751 | // thread_local, auto, or cv-qualifiers, the program is ill-formed. | |||
752 | auto &DS = D.getDeclSpec(); | |||
753 | { | |||
754 | SmallVector<StringRef, 8> BadSpecifiers; | |||
755 | SmallVector<SourceLocation, 8> BadSpecifierLocs; | |||
756 | SmallVector<StringRef, 8> CPlusPlus20Specifiers; | |||
757 | SmallVector<SourceLocation, 8> CPlusPlus20SpecifierLocs; | |||
758 | if (auto SCS = DS.getStorageClassSpec()) { | |||
759 | if (SCS == DeclSpec::SCS_static) { | |||
760 | CPlusPlus20Specifiers.push_back(DeclSpec::getSpecifierName(SCS)); | |||
761 | CPlusPlus20SpecifierLocs.push_back(DS.getStorageClassSpecLoc()); | |||
762 | } else { | |||
763 | BadSpecifiers.push_back(DeclSpec::getSpecifierName(SCS)); | |||
764 | BadSpecifierLocs.push_back(DS.getStorageClassSpecLoc()); | |||
765 | } | |||
766 | } | |||
767 | if (auto TSCS = DS.getThreadStorageClassSpec()) { | |||
768 | CPlusPlus20Specifiers.push_back(DeclSpec::getSpecifierName(TSCS)); | |||
769 | CPlusPlus20SpecifierLocs.push_back(DS.getThreadStorageClassSpecLoc()); | |||
770 | } | |||
771 | if (DS.hasConstexprSpecifier()) { | |||
772 | BadSpecifiers.push_back( | |||
773 | DeclSpec::getSpecifierName(DS.getConstexprSpecifier())); | |||
774 | BadSpecifierLocs.push_back(DS.getConstexprSpecLoc()); | |||
775 | } | |||
776 | if (DS.isInlineSpecified()) { | |||
777 | BadSpecifiers.push_back("inline"); | |||
778 | BadSpecifierLocs.push_back(DS.getInlineSpecLoc()); | |||
779 | } | |||
780 | if (!BadSpecifiers.empty()) { | |||
781 | auto &&Err = Diag(BadSpecifierLocs.front(), diag::err_decomp_decl_spec); | |||
782 | Err << (int)BadSpecifiers.size() | |||
783 | << llvm::join(BadSpecifiers.begin(), BadSpecifiers.end(), " "); | |||
784 | // Don't add FixItHints to remove the specifiers; we do still respect | |||
785 | // them when building the underlying variable. | |||
786 | for (auto Loc : BadSpecifierLocs) | |||
787 | Err << SourceRange(Loc, Loc); | |||
788 | } else if (!CPlusPlus20Specifiers.empty()) { | |||
789 | auto &&Warn = Diag(CPlusPlus20SpecifierLocs.front(), | |||
790 | getLangOpts().CPlusPlus20 | |||
791 | ? diag::warn_cxx17_compat_decomp_decl_spec | |||
792 | : diag::ext_decomp_decl_spec); | |||
793 | Warn << (int)CPlusPlus20Specifiers.size() | |||
794 | << llvm::join(CPlusPlus20Specifiers.begin(), | |||
795 | CPlusPlus20Specifiers.end(), " "); | |||
796 | for (auto Loc : CPlusPlus20SpecifierLocs) | |||
797 | Warn << SourceRange(Loc, Loc); | |||
798 | } | |||
799 | // We can't recover from it being declared as a typedef. | |||
800 | if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) | |||
801 | return nullptr; | |||
802 | } | |||
803 | ||||
804 | // C++2a [dcl.struct.bind]p1: | |||
805 | // A cv that includes volatile is deprecated | |||
806 | if ((DS.getTypeQualifiers() & DeclSpec::TQ_volatile) && | |||
807 | getLangOpts().CPlusPlus20) | |||
808 | Diag(DS.getVolatileSpecLoc(), | |||
809 | diag::warn_deprecated_volatile_structured_binding); | |||
810 | ||||
811 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); | |||
812 | QualType R = TInfo->getType(); | |||
813 | ||||
814 | if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, | |||
815 | UPPC_DeclarationType)) | |||
816 | D.setInvalidType(); | |||
817 | ||||
818 | // The syntax only allows a single ref-qualifier prior to the decomposition | |||
819 | // declarator. No other declarator chunks are permitted. Also check the type | |||
820 | // specifier here. | |||
821 | if (DS.getTypeSpecType() != DeclSpec::TST_auto || | |||
822 | D.hasGroupingParens() || D.getNumTypeObjects() > 1 || | |||
823 | (D.getNumTypeObjects() == 1 && | |||
824 | D.getTypeObject(0).Kind != DeclaratorChunk::Reference)) { | |||
825 | Diag(Decomp.getLSquareLoc(), | |||
826 | (D.hasGroupingParens() || | |||
827 | (D.getNumTypeObjects() && | |||
828 | D.getTypeObject(0).Kind == DeclaratorChunk::Paren)) | |||
829 | ? diag::err_decomp_decl_parens | |||
830 | : diag::err_decomp_decl_type) | |||
831 | << R; | |||
832 | ||||
833 | // In most cases, there's no actual problem with an explicitly-specified | |||
834 | // type, but a function type won't work here, and ActOnVariableDeclarator | |||
835 | // shouldn't be called for such a type. | |||
836 | if (R->isFunctionType()) | |||
837 | D.setInvalidType(); | |||
838 | } | |||
839 | ||||
840 | // Build the BindingDecls. | |||
841 | SmallVector<BindingDecl*, 8> Bindings; | |||
842 | ||||
843 | // Build the BindingDecls. | |||
844 | for (auto &B : D.getDecompositionDeclarator().bindings()) { | |||
845 | // Check for name conflicts. | |||
846 | DeclarationNameInfo NameInfo(B.Name, B.NameLoc); | |||
847 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, | |||
848 | ForVisibleRedeclaration); | |||
849 | LookupName(Previous, S, | |||
850 | /*CreateBuiltins*/DC->getRedeclContext()->isTranslationUnit()); | |||
851 | ||||
852 | // It's not permitted to shadow a template parameter name. | |||
853 | if (Previous.isSingleResult() && | |||
854 | Previous.getFoundDecl()->isTemplateParameter()) { | |||
855 | DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), | |||
856 | Previous.getFoundDecl()); | |||
857 | Previous.clear(); | |||
858 | } | |||
859 | ||||
860 | bool ConsiderLinkage = DC->isFunctionOrMethod() && | |||
861 | DS.getStorageClassSpec() == DeclSpec::SCS_extern; | |||
862 | FilterLookupForScope(Previous, DC, S, ConsiderLinkage, | |||
863 | /*AllowInlineNamespace*/false); | |||
864 | if (!Previous.empty()) { | |||
865 | auto *Old = Previous.getRepresentativeDecl(); | |||
866 | Diag(B.NameLoc, diag::err_redefinition) << B.Name; | |||
867 | Diag(Old->getLocation(), diag::note_previous_definition); | |||
868 | } | |||
869 | ||||
870 | auto *BD = BindingDecl::Create(Context, DC, B.NameLoc, B.Name); | |||
871 | PushOnScopeChains(BD, S, true); | |||
872 | Bindings.push_back(BD); | |||
873 | ParsingInitForAutoVars.insert(BD); | |||
874 | } | |||
875 | ||||
876 | // There are no prior lookup results for the variable itself, because it | |||
877 | // is unnamed. | |||
878 | DeclarationNameInfo NameInfo((IdentifierInfo *)nullptr, | |||
879 | Decomp.getLSquareLoc()); | |||
880 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, | |||
881 | ForVisibleRedeclaration); | |||
882 | ||||
883 | // Build the variable that holds the non-decomposed object. | |||
884 | bool AddToScope = true; | |||
885 | NamedDecl *New = | |||
886 | ActOnVariableDeclarator(S, D, DC, TInfo, Previous, | |||
887 | MultiTemplateParamsArg(), AddToScope, Bindings); | |||
888 | if (AddToScope) { | |||
889 | S->AddDecl(New); | |||
890 | CurContext->addHiddenDecl(New); | |||
891 | } | |||
892 | ||||
893 | if (isInOpenMPDeclareTargetContext()) | |||
894 | checkDeclIsAllowedInOpenMPTarget(nullptr, New); | |||
895 | ||||
896 | return New; | |||
897 | } | |||
898 | ||||
899 | static bool checkSimpleDecomposition( | |||
900 | Sema &S, ArrayRef<BindingDecl *> Bindings, ValueDecl *Src, | |||
901 | QualType DecompType, const llvm::APSInt &NumElems, QualType ElemType, | |||
902 | llvm::function_ref<ExprResult(SourceLocation, Expr *, unsigned)> GetInit) { | |||
903 | if ((int64_t)Bindings.size() != NumElems) { | |||
904 | S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings) | |||
905 | << DecompType << (unsigned)Bindings.size() | |||
906 | << (unsigned)NumElems.getLimitedValue(UINT_MAX(2147483647 *2U +1U)) << NumElems.toString(10) | |||
907 | << (NumElems < Bindings.size()); | |||
908 | return true; | |||
909 | } | |||
910 | ||||
911 | unsigned I = 0; | |||
912 | for (auto *B : Bindings) { | |||
913 | SourceLocation Loc = B->getLocation(); | |||
914 | ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc); | |||
915 | if (E.isInvalid()) | |||
916 | return true; | |||
917 | E = GetInit(Loc, E.get(), I++); | |||
918 | if (E.isInvalid()) | |||
919 | return true; | |||
920 | B->setBinding(ElemType, E.get()); | |||
921 | } | |||
922 | ||||
923 | return false; | |||
924 | } | |||
925 | ||||
926 | static bool checkArrayLikeDecomposition(Sema &S, | |||
927 | ArrayRef<BindingDecl *> Bindings, | |||
928 | ValueDecl *Src, QualType DecompType, | |||
929 | const llvm::APSInt &NumElems, | |||
930 | QualType ElemType) { | |||
931 | return checkSimpleDecomposition( | |||
932 | S, Bindings, Src, DecompType, NumElems, ElemType, | |||
933 | [&](SourceLocation Loc, Expr *Base, unsigned I) -> ExprResult { | |||
934 | ExprResult E = S.ActOnIntegerConstant(Loc, I); | |||
935 | if (E.isInvalid()) | |||
936 | return ExprError(); | |||
937 | return S.CreateBuiltinArraySubscriptExpr(Base, Loc, E.get(), Loc); | |||
938 | }); | |||
939 | } | |||
940 | ||||
941 | static bool checkArrayDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings, | |||
942 | ValueDecl *Src, QualType DecompType, | |||
943 | const ConstantArrayType *CAT) { | |||
944 | return checkArrayLikeDecomposition(S, Bindings, Src, DecompType, | |||
945 | llvm::APSInt(CAT->getSize()), | |||
946 | CAT->getElementType()); | |||
947 | } | |||
948 | ||||
949 | static bool checkVectorDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings, | |||
950 | ValueDecl *Src, QualType DecompType, | |||
951 | const VectorType *VT) { | |||
952 | return checkArrayLikeDecomposition( | |||
953 | S, Bindings, Src, DecompType, llvm::APSInt::get(VT->getNumElements()), | |||
954 | S.Context.getQualifiedType(VT->getElementType(), | |||
955 | DecompType.getQualifiers())); | |||
956 | } | |||
957 | ||||
958 | static bool checkComplexDecomposition(Sema &S, | |||
959 | ArrayRef<BindingDecl *> Bindings, | |||
960 | ValueDecl *Src, QualType DecompType, | |||
961 | const ComplexType *CT) { | |||
962 | return checkSimpleDecomposition( | |||
963 | S, Bindings, Src, DecompType, llvm::APSInt::get(2), | |||
964 | S.Context.getQualifiedType(CT->getElementType(), | |||
965 | DecompType.getQualifiers()), | |||
966 | [&](SourceLocation Loc, Expr *Base, unsigned I) -> ExprResult { | |||
967 | return S.CreateBuiltinUnaryOp(Loc, I ? UO_Imag : UO_Real, Base); | |||
968 | }); | |||
969 | } | |||
970 | ||||
971 | static std::string printTemplateArgs(const PrintingPolicy &PrintingPolicy, | |||
972 | TemplateArgumentListInfo &Args) { | |||
973 | SmallString<128> SS; | |||
974 | llvm::raw_svector_ostream OS(SS); | |||
975 | bool First = true; | |||
976 | for (auto &Arg : Args.arguments()) { | |||
977 | if (!First) | |||
978 | OS << ", "; | |||
979 | Arg.getArgument().print(PrintingPolicy, OS); | |||
980 | First = false; | |||
981 | } | |||
982 | return std::string(OS.str()); | |||
983 | } | |||
984 | ||||
985 | static bool lookupStdTypeTraitMember(Sema &S, LookupResult &TraitMemberLookup, | |||
986 | SourceLocation Loc, StringRef Trait, | |||
987 | TemplateArgumentListInfo &Args, | |||
988 | unsigned DiagID) { | |||
989 | auto DiagnoseMissing = [&] { | |||
990 | if (DiagID) | |||
991 | S.Diag(Loc, DiagID) << printTemplateArgs(S.Context.getPrintingPolicy(), | |||
992 | Args); | |||
993 | return true; | |||
994 | }; | |||
995 | ||||
996 | // FIXME: Factor out duplication with lookupPromiseType in SemaCoroutine. | |||
997 | NamespaceDecl *Std = S.getStdNamespace(); | |||
998 | if (!Std) | |||
999 | return DiagnoseMissing(); | |||
1000 | ||||
1001 | // Look up the trait itself, within namespace std. We can diagnose various | |||
1002 | // problems with this lookup even if we've been asked to not diagnose a | |||
1003 | // missing specialization, because this can only fail if the user has been | |||
1004 | // declaring their own names in namespace std or we don't support the | |||
1005 | // standard library implementation in use. | |||
1006 | LookupResult Result(S, &S.PP.getIdentifierTable().get(Trait), | |||
1007 | Loc, Sema::LookupOrdinaryName); | |||
1008 | if (!S.LookupQualifiedName(Result, Std)) | |||
1009 | return DiagnoseMissing(); | |||
1010 | if (Result.isAmbiguous()) | |||
1011 | return true; | |||
1012 | ||||
1013 | ClassTemplateDecl *TraitTD = Result.getAsSingle<ClassTemplateDecl>(); | |||
1014 | if (!TraitTD) { | |||
1015 | Result.suppressDiagnostics(); | |||
1016 | NamedDecl *Found = *Result.begin(); | |||
1017 | S.Diag(Loc, diag::err_std_type_trait_not_class_template) << Trait; | |||
1018 | S.Diag(Found->getLocation(), diag::note_declared_at); | |||
1019 | return true; | |||
1020 | } | |||
1021 | ||||
1022 | // Build the template-id. | |||
1023 | QualType TraitTy = S.CheckTemplateIdType(TemplateName(TraitTD), Loc, Args); | |||
1024 | if (TraitTy.isNull()) | |||
1025 | return true; | |||
1026 | if (!S.isCompleteType(Loc, TraitTy)) { | |||
1027 | if (DiagID) | |||
1028 | S.RequireCompleteType( | |||
1029 | Loc, TraitTy, DiagID, | |||
1030 | printTemplateArgs(S.Context.getPrintingPolicy(), Args)); | |||
1031 | return true; | |||
1032 | } | |||
1033 | ||||
1034 | CXXRecordDecl *RD = TraitTy->getAsCXXRecordDecl(); | |||
1035 | assert(RD && "specialization of class template is not a class?")((RD && "specialization of class template is not a class?" ) ? static_cast<void> (0) : __assert_fail ("RD && \"specialization of class template is not a class?\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 1035, __PRETTY_FUNCTION__)); | |||
1036 | ||||
1037 | // Look up the member of the trait type. | |||
1038 | S.LookupQualifiedName(TraitMemberLookup, RD); | |||
1039 | return TraitMemberLookup.isAmbiguous(); | |||
1040 | } | |||
1041 | ||||
1042 | static TemplateArgumentLoc | |||
1043 | getTrivialIntegralTemplateArgument(Sema &S, SourceLocation Loc, QualType T, | |||
1044 | uint64_t I) { | |||
1045 | TemplateArgument Arg(S.Context, S.Context.MakeIntValue(I, T), T); | |||
1046 | return S.getTrivialTemplateArgumentLoc(Arg, T, Loc); | |||
1047 | } | |||
1048 | ||||
1049 | static TemplateArgumentLoc | |||
1050 | getTrivialTypeTemplateArgument(Sema &S, SourceLocation Loc, QualType T) { | |||
1051 | return S.getTrivialTemplateArgumentLoc(TemplateArgument(T), QualType(), Loc); | |||
1052 | } | |||
1053 | ||||
1054 | namespace { enum class IsTupleLike { TupleLike, NotTupleLike, Error }; } | |||
1055 | ||||
1056 | static IsTupleLike isTupleLike(Sema &S, SourceLocation Loc, QualType T, | |||
1057 | llvm::APSInt &Size) { | |||
1058 | EnterExpressionEvaluationContext ContextRAII( | |||
1059 | S, Sema::ExpressionEvaluationContext::ConstantEvaluated); | |||
1060 | ||||
1061 | DeclarationName Value = S.PP.getIdentifierInfo("value"); | |||
1062 | LookupResult R(S, Value, Loc, Sema::LookupOrdinaryName); | |||
1063 | ||||
1064 | // Form template argument list for tuple_size<T>. | |||
1065 | TemplateArgumentListInfo Args(Loc, Loc); | |||
1066 | Args.addArgument(getTrivialTypeTemplateArgument(S, Loc, T)); | |||
1067 | ||||
1068 | // If there's no tuple_size specialization or the lookup of 'value' is empty, | |||
1069 | // it's not tuple-like. | |||
1070 | if (lookupStdTypeTraitMember(S, R, Loc, "tuple_size", Args, /*DiagID*/ 0) || | |||
1071 | R.empty()) | |||
1072 | return IsTupleLike::NotTupleLike; | |||
1073 | ||||
1074 | // If we get this far, we've committed to the tuple interpretation, but | |||
1075 | // we can still fail if there actually isn't a usable ::value. | |||
1076 | ||||
1077 | struct ICEDiagnoser : Sema::VerifyICEDiagnoser { | |||
1078 | LookupResult &R; | |||
1079 | TemplateArgumentListInfo &Args; | |||
1080 | ICEDiagnoser(LookupResult &R, TemplateArgumentListInfo &Args) | |||
1081 | : R(R), Args(Args) {} | |||
1082 | Sema::SemaDiagnosticBuilder diagnoseNotICE(Sema &S, | |||
1083 | SourceLocation Loc) override { | |||
1084 | return S.Diag(Loc, diag::err_decomp_decl_std_tuple_size_not_constant) | |||
1085 | << printTemplateArgs(S.Context.getPrintingPolicy(), Args); | |||
1086 | } | |||
1087 | } Diagnoser(R, Args); | |||
1088 | ||||
1089 | ExprResult E = | |||
1090 | S.BuildDeclarationNameExpr(CXXScopeSpec(), R, /*NeedsADL*/false); | |||
1091 | if (E.isInvalid()) | |||
1092 | return IsTupleLike::Error; | |||
1093 | ||||
1094 | E = S.VerifyIntegerConstantExpression(E.get(), &Size, Diagnoser); | |||
1095 | if (E.isInvalid()) | |||
1096 | return IsTupleLike::Error; | |||
1097 | ||||
1098 | return IsTupleLike::TupleLike; | |||
1099 | } | |||
1100 | ||||
1101 | /// \return std::tuple_element<I, T>::type. | |||
1102 | static QualType getTupleLikeElementType(Sema &S, SourceLocation Loc, | |||
1103 | unsigned I, QualType T) { | |||
1104 | // Form template argument list for tuple_element<I, T>. | |||
1105 | TemplateArgumentListInfo Args(Loc, Loc); | |||
1106 | Args.addArgument( | |||
1107 | getTrivialIntegralTemplateArgument(S, Loc, S.Context.getSizeType(), I)); | |||
1108 | Args.addArgument(getTrivialTypeTemplateArgument(S, Loc, T)); | |||
1109 | ||||
1110 | DeclarationName TypeDN = S.PP.getIdentifierInfo("type"); | |||
1111 | LookupResult R(S, TypeDN, Loc, Sema::LookupOrdinaryName); | |||
1112 | if (lookupStdTypeTraitMember( | |||
1113 | S, R, Loc, "tuple_element", Args, | |||
1114 | diag::err_decomp_decl_std_tuple_element_not_specialized)) | |||
1115 | return QualType(); | |||
1116 | ||||
1117 | auto *TD = R.getAsSingle<TypeDecl>(); | |||
1118 | if (!TD) { | |||
1119 | R.suppressDiagnostics(); | |||
1120 | S.Diag(Loc, diag::err_decomp_decl_std_tuple_element_not_specialized) | |||
1121 | << printTemplateArgs(S.Context.getPrintingPolicy(), Args); | |||
1122 | if (!R.empty()) | |||
1123 | S.Diag(R.getRepresentativeDecl()->getLocation(), diag::note_declared_at); | |||
1124 | return QualType(); | |||
1125 | } | |||
1126 | ||||
1127 | return S.Context.getTypeDeclType(TD); | |||
1128 | } | |||
1129 | ||||
1130 | namespace { | |||
1131 | struct InitializingBinding { | |||
1132 | Sema &S; | |||
1133 | InitializingBinding(Sema &S, BindingDecl *BD) : S(S) { | |||
1134 | Sema::CodeSynthesisContext Ctx; | |||
1135 | Ctx.Kind = Sema::CodeSynthesisContext::InitializingStructuredBinding; | |||
1136 | Ctx.PointOfInstantiation = BD->getLocation(); | |||
1137 | Ctx.Entity = BD; | |||
1138 | S.pushCodeSynthesisContext(Ctx); | |||
1139 | } | |||
1140 | ~InitializingBinding() { | |||
1141 | S.popCodeSynthesisContext(); | |||
1142 | } | |||
1143 | }; | |||
1144 | } | |||
1145 | ||||
1146 | static bool checkTupleLikeDecomposition(Sema &S, | |||
1147 | ArrayRef<BindingDecl *> Bindings, | |||
1148 | VarDecl *Src, QualType DecompType, | |||
1149 | const llvm::APSInt &TupleSize) { | |||
1150 | if ((int64_t)Bindings.size() != TupleSize) { | |||
1151 | S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings) | |||
1152 | << DecompType << (unsigned)Bindings.size() | |||
1153 | << (unsigned)TupleSize.getLimitedValue(UINT_MAX(2147483647 *2U +1U)) | |||
1154 | << TupleSize.toString(10) << (TupleSize < Bindings.size()); | |||
1155 | return true; | |||
1156 | } | |||
1157 | ||||
1158 | if (Bindings.empty()) | |||
1159 | return false; | |||
1160 | ||||
1161 | DeclarationName GetDN = S.PP.getIdentifierInfo("get"); | |||
1162 | ||||
1163 | // [dcl.decomp]p3: | |||
1164 | // The unqualified-id get is looked up in the scope of E by class member | |||
1165 | // access lookup ... | |||
1166 | LookupResult MemberGet(S, GetDN, Src->getLocation(), Sema::LookupMemberName); | |||
1167 | bool UseMemberGet = false; | |||
1168 | if (S.isCompleteType(Src->getLocation(), DecompType)) { | |||
1169 | if (auto *RD = DecompType->getAsCXXRecordDecl()) | |||
1170 | S.LookupQualifiedName(MemberGet, RD); | |||
1171 | if (MemberGet.isAmbiguous()) | |||
1172 | return true; | |||
1173 | // ... and if that finds at least one declaration that is a function | |||
1174 | // template whose first template parameter is a non-type parameter ... | |||
1175 | for (NamedDecl *D : MemberGet) { | |||
1176 | if (FunctionTemplateDecl *FTD = | |||
1177 | dyn_cast<FunctionTemplateDecl>(D->getUnderlyingDecl())) { | |||
1178 | TemplateParameterList *TPL = FTD->getTemplateParameters(); | |||
1179 | if (TPL->size() != 0 && | |||
1180 | isa<NonTypeTemplateParmDecl>(TPL->getParam(0))) { | |||
1181 | // ... the initializer is e.get<i>(). | |||
1182 | UseMemberGet = true; | |||
1183 | break; | |||
1184 | } | |||
1185 | } | |||
1186 | } | |||
1187 | } | |||
1188 | ||||
1189 | unsigned I = 0; | |||
1190 | for (auto *B : Bindings) { | |||
1191 | InitializingBinding InitContext(S, B); | |||
1192 | SourceLocation Loc = B->getLocation(); | |||
1193 | ||||
1194 | ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc); | |||
1195 | if (E.isInvalid()) | |||
1196 | return true; | |||
1197 | ||||
1198 | // e is an lvalue if the type of the entity is an lvalue reference and | |||
1199 | // an xvalue otherwise | |||
1200 | if (!Src->getType()->isLValueReferenceType()) | |||
1201 | E = ImplicitCastExpr::Create(S.Context, E.get()->getType(), CK_NoOp, | |||
1202 | E.get(), nullptr, VK_XValue, | |||
1203 | FPOptionsOverride()); | |||
1204 | ||||
1205 | TemplateArgumentListInfo Args(Loc, Loc); | |||
1206 | Args.addArgument( | |||
1207 | getTrivialIntegralTemplateArgument(S, Loc, S.Context.getSizeType(), I)); | |||
1208 | ||||
1209 | if (UseMemberGet) { | |||
1210 | // if [lookup of member get] finds at least one declaration, the | |||
1211 | // initializer is e.get<i-1>(). | |||
1212 | E = S.BuildMemberReferenceExpr(E.get(), DecompType, Loc, false, | |||
1213 | CXXScopeSpec(), SourceLocation(), nullptr, | |||
1214 | MemberGet, &Args, nullptr); | |||
1215 | if (E.isInvalid()) | |||
1216 | return true; | |||
1217 | ||||
1218 | E = S.BuildCallExpr(nullptr, E.get(), Loc, None, Loc); | |||
1219 | } else { | |||
1220 | // Otherwise, the initializer is get<i-1>(e), where get is looked up | |||
1221 | // in the associated namespaces. | |||
1222 | Expr *Get = UnresolvedLookupExpr::Create( | |||
1223 | S.Context, nullptr, NestedNameSpecifierLoc(), SourceLocation(), | |||
1224 | DeclarationNameInfo(GetDN, Loc), /*RequiresADL*/true, &Args, | |||
1225 | UnresolvedSetIterator(), UnresolvedSetIterator()); | |||
1226 | ||||
1227 | Expr *Arg = E.get(); | |||
1228 | E = S.BuildCallExpr(nullptr, Get, Loc, Arg, Loc); | |||
1229 | } | |||
1230 | if (E.isInvalid()) | |||
1231 | return true; | |||
1232 | Expr *Init = E.get(); | |||
1233 | ||||
1234 | // Given the type T designated by std::tuple_element<i - 1, E>::type, | |||
1235 | QualType T = getTupleLikeElementType(S, Loc, I, DecompType); | |||
1236 | if (T.isNull()) | |||
1237 | return true; | |||
1238 | ||||
1239 | // each vi is a variable of type "reference to T" initialized with the | |||
1240 | // initializer, where the reference is an lvalue reference if the | |||
1241 | // initializer is an lvalue and an rvalue reference otherwise | |||
1242 | QualType RefType = | |||
1243 | S.BuildReferenceType(T, E.get()->isLValue(), Loc, B->getDeclName()); | |||
1244 | if (RefType.isNull()) | |||
1245 | return true; | |||
1246 | auto *RefVD = VarDecl::Create( | |||
1247 | S.Context, Src->getDeclContext(), Loc, Loc, | |||
1248 | B->getDeclName().getAsIdentifierInfo(), RefType, | |||
1249 | S.Context.getTrivialTypeSourceInfo(T, Loc), Src->getStorageClass()); | |||
1250 | RefVD->setLexicalDeclContext(Src->getLexicalDeclContext()); | |||
1251 | RefVD->setTSCSpec(Src->getTSCSpec()); | |||
1252 | RefVD->setImplicit(); | |||
1253 | if (Src->isInlineSpecified()) | |||
1254 | RefVD->setInlineSpecified(); | |||
1255 | RefVD->getLexicalDeclContext()->addHiddenDecl(RefVD); | |||
1256 | ||||
1257 | InitializedEntity Entity = InitializedEntity::InitializeBinding(RefVD); | |||
1258 | InitializationKind Kind = InitializationKind::CreateCopy(Loc, Loc); | |||
1259 | InitializationSequence Seq(S, Entity, Kind, Init); | |||
1260 | E = Seq.Perform(S, Entity, Kind, Init); | |||
1261 | if (E.isInvalid()) | |||
1262 | return true; | |||
1263 | E = S.ActOnFinishFullExpr(E.get(), Loc, /*DiscardedValue*/ false); | |||
1264 | if (E.isInvalid()) | |||
1265 | return true; | |||
1266 | RefVD->setInit(E.get()); | |||
1267 | S.CheckCompleteVariableDeclaration(RefVD); | |||
1268 | ||||
1269 | E = S.BuildDeclarationNameExpr(CXXScopeSpec(), | |||
1270 | DeclarationNameInfo(B->getDeclName(), Loc), | |||
1271 | RefVD); | |||
1272 | if (E.isInvalid()) | |||
1273 | return true; | |||
1274 | ||||
1275 | B->setBinding(T, E.get()); | |||
1276 | I++; | |||
1277 | } | |||
1278 | ||||
1279 | return false; | |||
1280 | } | |||
1281 | ||||
1282 | /// Find the base class to decompose in a built-in decomposition of a class type. | |||
1283 | /// This base class search is, unfortunately, not quite like any other that we | |||
1284 | /// perform anywhere else in C++. | |||
1285 | static DeclAccessPair findDecomposableBaseClass(Sema &S, SourceLocation Loc, | |||
1286 | const CXXRecordDecl *RD, | |||
1287 | CXXCastPath &BasePath) { | |||
1288 | auto BaseHasFields = [](const CXXBaseSpecifier *Specifier, | |||
1289 | CXXBasePath &Path) { | |||
1290 | return Specifier->getType()->getAsCXXRecordDecl()->hasDirectFields(); | |||
1291 | }; | |||
1292 | ||||
1293 | const CXXRecordDecl *ClassWithFields = nullptr; | |||
1294 | AccessSpecifier AS = AS_public; | |||
1295 | if (RD->hasDirectFields()) | |||
1296 | // [dcl.decomp]p4: | |||
1297 | // Otherwise, all of E's non-static data members shall be public direct | |||
1298 | // members of E ... | |||
1299 | ClassWithFields = RD; | |||
1300 | else { | |||
1301 | // ... or of ... | |||
1302 | CXXBasePaths Paths; | |||
1303 | Paths.setOrigin(const_cast<CXXRecordDecl*>(RD)); | |||
1304 | if (!RD->lookupInBases(BaseHasFields, Paths)) { | |||
1305 | // If no classes have fields, just decompose RD itself. (This will work | |||
1306 | // if and only if zero bindings were provided.) | |||
1307 | return DeclAccessPair::make(const_cast<CXXRecordDecl*>(RD), AS_public); | |||
1308 | } | |||
1309 | ||||
1310 | CXXBasePath *BestPath = nullptr; | |||
1311 | for (auto &P : Paths) { | |||
1312 | if (!BestPath) | |||
1313 | BestPath = &P; | |||
1314 | else if (!S.Context.hasSameType(P.back().Base->getType(), | |||
1315 | BestPath->back().Base->getType())) { | |||
1316 | // ... the same ... | |||
1317 | S.Diag(Loc, diag::err_decomp_decl_multiple_bases_with_members) | |||
1318 | << false << RD << BestPath->back().Base->getType() | |||
1319 | << P.back().Base->getType(); | |||
1320 | return DeclAccessPair(); | |||
1321 | } else if (P.Access < BestPath->Access) { | |||
1322 | BestPath = &P; | |||
1323 | } | |||
1324 | } | |||
1325 | ||||
1326 | // ... unambiguous ... | |||
1327 | QualType BaseType = BestPath->back().Base->getType(); | |||
1328 | if (Paths.isAmbiguous(S.Context.getCanonicalType(BaseType))) { | |||
1329 | S.Diag(Loc, diag::err_decomp_decl_ambiguous_base) | |||
1330 | << RD << BaseType << S.getAmbiguousPathsDisplayString(Paths); | |||
1331 | return DeclAccessPair(); | |||
1332 | } | |||
1333 | ||||
1334 | // ... [accessible, implied by other rules] base class of E. | |||
1335 | S.CheckBaseClassAccess(Loc, BaseType, S.Context.getRecordType(RD), | |||
1336 | *BestPath, diag::err_decomp_decl_inaccessible_base); | |||
1337 | AS = BestPath->Access; | |||
1338 | ||||
1339 | ClassWithFields = BaseType->getAsCXXRecordDecl(); | |||
1340 | S.BuildBasePathArray(Paths, BasePath); | |||
1341 | } | |||
1342 | ||||
1343 | // The above search did not check whether the selected class itself has base | |||
1344 | // classes with fields, so check that now. | |||
1345 | CXXBasePaths Paths; | |||
1346 | if (ClassWithFields->lookupInBases(BaseHasFields, Paths)) { | |||
1347 | S.Diag(Loc, diag::err_decomp_decl_multiple_bases_with_members) | |||
1348 | << (ClassWithFields == RD) << RD << ClassWithFields | |||
1349 | << Paths.front().back().Base->getType(); | |||
1350 | return DeclAccessPair(); | |||
1351 | } | |||
1352 | ||||
1353 | return DeclAccessPair::make(const_cast<CXXRecordDecl*>(ClassWithFields), AS); | |||
1354 | } | |||
1355 | ||||
1356 | static bool checkMemberDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings, | |||
1357 | ValueDecl *Src, QualType DecompType, | |||
1358 | const CXXRecordDecl *OrigRD) { | |||
1359 | if (S.RequireCompleteType(Src->getLocation(), DecompType, | |||
1360 | diag::err_incomplete_type)) | |||
1361 | return true; | |||
1362 | ||||
1363 | CXXCastPath BasePath; | |||
1364 | DeclAccessPair BasePair = | |||
1365 | findDecomposableBaseClass(S, Src->getLocation(), OrigRD, BasePath); | |||
1366 | const CXXRecordDecl *RD = cast_or_null<CXXRecordDecl>(BasePair.getDecl()); | |||
1367 | if (!RD) | |||
1368 | return true; | |||
1369 | QualType BaseType = S.Context.getQualifiedType(S.Context.getRecordType(RD), | |||
1370 | DecompType.getQualifiers()); | |||
1371 | ||||
1372 | auto DiagnoseBadNumberOfBindings = [&]() -> bool { | |||
1373 | unsigned NumFields = | |||
1374 | std::count_if(RD->field_begin(), RD->field_end(), | |||
1375 | [](FieldDecl *FD) { return !FD->isUnnamedBitfield(); }); | |||
1376 | assert(Bindings.size() != NumFields)((Bindings.size() != NumFields) ? static_cast<void> (0) : __assert_fail ("Bindings.size() != NumFields", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 1376, __PRETTY_FUNCTION__)); | |||
1377 | S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings) | |||
1378 | << DecompType << (unsigned)Bindings.size() << NumFields << NumFields | |||
1379 | << (NumFields < Bindings.size()); | |||
1380 | return true; | |||
1381 | }; | |||
1382 | ||||
1383 | // all of E's non-static data members shall be [...] well-formed | |||
1384 | // when named as e.name in the context of the structured binding, | |||
1385 | // E shall not have an anonymous union member, ... | |||
1386 | unsigned I = 0; | |||
1387 | for (auto *FD : RD->fields()) { | |||
1388 | if (FD->isUnnamedBitfield()) | |||
1389 | continue; | |||
1390 | ||||
1391 | // All the non-static data members are required to be nameable, so they | |||
1392 | // must all have names. | |||
1393 | if (!FD->getDeclName()) { | |||
1394 | if (RD->isLambda()) { | |||
1395 | S.Diag(Src->getLocation(), diag::err_decomp_decl_lambda); | |||
1396 | S.Diag(RD->getLocation(), diag::note_lambda_decl); | |||
1397 | return true; | |||
1398 | } | |||
1399 | ||||
1400 | if (FD->isAnonymousStructOrUnion()) { | |||
1401 | S.Diag(Src->getLocation(), diag::err_decomp_decl_anon_union_member) | |||
1402 | << DecompType << FD->getType()->isUnionType(); | |||
1403 | S.Diag(FD->getLocation(), diag::note_declared_at); | |||
1404 | return true; | |||
1405 | } | |||
1406 | ||||
1407 | // FIXME: Are there any other ways we could have an anonymous member? | |||
1408 | } | |||
1409 | ||||
1410 | // We have a real field to bind. | |||
1411 | if (I >= Bindings.size()) | |||
1412 | return DiagnoseBadNumberOfBindings(); | |||
1413 | auto *B = Bindings[I++]; | |||
1414 | SourceLocation Loc = B->getLocation(); | |||
1415 | ||||
1416 | // The field must be accessible in the context of the structured binding. | |||
1417 | // We already checked that the base class is accessible. | |||
1418 | // FIXME: Add 'const' to AccessedEntity's classes so we can remove the | |||
1419 | // const_cast here. | |||
1420 | S.CheckStructuredBindingMemberAccess( | |||
1421 | Loc, const_cast<CXXRecordDecl *>(OrigRD), | |||
1422 | DeclAccessPair::make(FD, CXXRecordDecl::MergeAccess( | |||
1423 | BasePair.getAccess(), FD->getAccess()))); | |||
1424 | ||||
1425 | // Initialize the binding to Src.FD. | |||
1426 | ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc); | |||
1427 | if (E.isInvalid()) | |||
1428 | return true; | |||
1429 | E = S.ImpCastExprToType(E.get(), BaseType, CK_UncheckedDerivedToBase, | |||
1430 | VK_LValue, &BasePath); | |||
1431 | if (E.isInvalid()) | |||
1432 | return true; | |||
1433 | E = S.BuildFieldReferenceExpr(E.get(), /*IsArrow*/ false, Loc, | |||
1434 | CXXScopeSpec(), FD, | |||
1435 | DeclAccessPair::make(FD, FD->getAccess()), | |||
1436 | DeclarationNameInfo(FD->getDeclName(), Loc)); | |||
1437 | if (E.isInvalid()) | |||
1438 | return true; | |||
1439 | ||||
1440 | // If the type of the member is T, the referenced type is cv T, where cv is | |||
1441 | // the cv-qualification of the decomposition expression. | |||
1442 | // | |||
1443 | // FIXME: We resolve a defect here: if the field is mutable, we do not add | |||
1444 | // 'const' to the type of the field. | |||
1445 | Qualifiers Q = DecompType.getQualifiers(); | |||
1446 | if (FD->isMutable()) | |||
1447 | Q.removeConst(); | |||
1448 | B->setBinding(S.BuildQualifiedType(FD->getType(), Loc, Q), E.get()); | |||
1449 | } | |||
1450 | ||||
1451 | if (I != Bindings.size()) | |||
1452 | return DiagnoseBadNumberOfBindings(); | |||
1453 | ||||
1454 | return false; | |||
1455 | } | |||
1456 | ||||
1457 | void Sema::CheckCompleteDecompositionDeclaration(DecompositionDecl *DD) { | |||
1458 | QualType DecompType = DD->getType(); | |||
1459 | ||||
1460 | // If the type of the decomposition is dependent, then so is the type of | |||
1461 | // each binding. | |||
1462 | if (DecompType->isDependentType()) { | |||
1463 | for (auto *B : DD->bindings()) | |||
1464 | B->setType(Context.DependentTy); | |||
1465 | return; | |||
1466 | } | |||
1467 | ||||
1468 | DecompType = DecompType.getNonReferenceType(); | |||
1469 | ArrayRef<BindingDecl*> Bindings = DD->bindings(); | |||
1470 | ||||
1471 | // C++1z [dcl.decomp]/2: | |||
1472 | // If E is an array type [...] | |||
1473 | // As an extension, we also support decomposition of built-in complex and | |||
1474 | // vector types. | |||
1475 | if (auto *CAT = Context.getAsConstantArrayType(DecompType)) { | |||
1476 | if (checkArrayDecomposition(*this, Bindings, DD, DecompType, CAT)) | |||
1477 | DD->setInvalidDecl(); | |||
1478 | return; | |||
1479 | } | |||
1480 | if (auto *VT = DecompType->getAs<VectorType>()) { | |||
1481 | if (checkVectorDecomposition(*this, Bindings, DD, DecompType, VT)) | |||
1482 | DD->setInvalidDecl(); | |||
1483 | return; | |||
1484 | } | |||
1485 | if (auto *CT = DecompType->getAs<ComplexType>()) { | |||
1486 | if (checkComplexDecomposition(*this, Bindings, DD, DecompType, CT)) | |||
1487 | DD->setInvalidDecl(); | |||
1488 | return; | |||
1489 | } | |||
1490 | ||||
1491 | // C++1z [dcl.decomp]/3: | |||
1492 | // if the expression std::tuple_size<E>::value is a well-formed integral | |||
1493 | // constant expression, [...] | |||
1494 | llvm::APSInt TupleSize(32); | |||
1495 | switch (isTupleLike(*this, DD->getLocation(), DecompType, TupleSize)) { | |||
1496 | case IsTupleLike::Error: | |||
1497 | DD->setInvalidDecl(); | |||
1498 | return; | |||
1499 | ||||
1500 | case IsTupleLike::TupleLike: | |||
1501 | if (checkTupleLikeDecomposition(*this, Bindings, DD, DecompType, TupleSize)) | |||
1502 | DD->setInvalidDecl(); | |||
1503 | return; | |||
1504 | ||||
1505 | case IsTupleLike::NotTupleLike: | |||
1506 | break; | |||
1507 | } | |||
1508 | ||||
1509 | // C++1z [dcl.dcl]/8: | |||
1510 | // [E shall be of array or non-union class type] | |||
1511 | CXXRecordDecl *RD = DecompType->getAsCXXRecordDecl(); | |||
1512 | if (!RD || RD->isUnion()) { | |||
1513 | Diag(DD->getLocation(), diag::err_decomp_decl_unbindable_type) | |||
1514 | << DD << !RD << DecompType; | |||
1515 | DD->setInvalidDecl(); | |||
1516 | return; | |||
1517 | } | |||
1518 | ||||
1519 | // C++1z [dcl.decomp]/4: | |||
1520 | // all of E's non-static data members shall be [...] direct members of | |||
1521 | // E or of the same unambiguous public base class of E, ... | |||
1522 | if (checkMemberDecomposition(*this, Bindings, DD, DecompType, RD)) | |||
1523 | DD->setInvalidDecl(); | |||
1524 | } | |||
1525 | ||||
1526 | /// Merge the exception specifications of two variable declarations. | |||
1527 | /// | |||
1528 | /// This is called when there's a redeclaration of a VarDecl. The function | |||
1529 | /// checks if the redeclaration might have an exception specification and | |||
1530 | /// validates compatibility and merges the specs if necessary. | |||
1531 | void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { | |||
1532 | // Shortcut if exceptions are disabled. | |||
1533 | if (!getLangOpts().CXXExceptions) | |||
1534 | return; | |||
1535 | ||||
1536 | assert(Context.hasSameType(New->getType(), Old->getType()) &&((Context.hasSameType(New->getType(), Old->getType()) && "Should only be called if types are otherwise the same.") ? static_cast <void> (0) : __assert_fail ("Context.hasSameType(New->getType(), Old->getType()) && \"Should only be called if types are otherwise the same.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 1537, __PRETTY_FUNCTION__)) | |||
1537 | "Should only be called if types are otherwise the same.")((Context.hasSameType(New->getType(), Old->getType()) && "Should only be called if types are otherwise the same.") ? static_cast <void> (0) : __assert_fail ("Context.hasSameType(New->getType(), Old->getType()) && \"Should only be called if types are otherwise the same.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 1537, __PRETTY_FUNCTION__)); | |||
1538 | ||||
1539 | QualType NewType = New->getType(); | |||
1540 | QualType OldType = Old->getType(); | |||
1541 | ||||
1542 | // We're only interested in pointers and references to functions, as well | |||
1543 | // as pointers to member functions. | |||
1544 | if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { | |||
1545 | NewType = R->getPointeeType(); | |||
1546 | OldType = OldType->castAs<ReferenceType>()->getPointeeType(); | |||
1547 | } else if (const PointerType *P = NewType->getAs<PointerType>()) { | |||
1548 | NewType = P->getPointeeType(); | |||
1549 | OldType = OldType->castAs<PointerType>()->getPointeeType(); | |||
1550 | } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { | |||
1551 | NewType = M->getPointeeType(); | |||
1552 | OldType = OldType->castAs<MemberPointerType>()->getPointeeType(); | |||
1553 | } | |||
1554 | ||||
1555 | if (!NewType->isFunctionProtoType()) | |||
1556 | return; | |||
1557 | ||||
1558 | // There's lots of special cases for functions. For function pointers, system | |||
1559 | // libraries are hopefully not as broken so that we don't need these | |||
1560 | // workarounds. | |||
1561 | if (CheckEquivalentExceptionSpec( | |||
1562 | OldType->getAs<FunctionProtoType>(), Old->getLocation(), | |||
1563 | NewType->getAs<FunctionProtoType>(), New->getLocation())) { | |||
1564 | New->setInvalidDecl(); | |||
1565 | } | |||
1566 | } | |||
1567 | ||||
1568 | /// CheckCXXDefaultArguments - Verify that the default arguments for a | |||
1569 | /// function declaration are well-formed according to C++ | |||
1570 | /// [dcl.fct.default]. | |||
1571 | void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { | |||
1572 | unsigned NumParams = FD->getNumParams(); | |||
1573 | unsigned ParamIdx = 0; | |||
1574 | ||||
1575 | // This checking doesn't make sense for explicit specializations; their | |||
1576 | // default arguments are determined by the declaration we're specializing, | |||
1577 | // not by FD. | |||
1578 | if (FD->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) | |||
1579 | return; | |||
1580 | if (auto *FTD = FD->getDescribedFunctionTemplate()) | |||
1581 | if (FTD->isMemberSpecialization()) | |||
1582 | return; | |||
1583 | ||||
1584 | // Find first parameter with a default argument | |||
1585 | for (; ParamIdx < NumParams; ++ParamIdx) { | |||
1586 | ParmVarDecl *Param = FD->getParamDecl(ParamIdx); | |||
1587 | if (Param->hasDefaultArg()) | |||
1588 | break; | |||
1589 | } | |||
1590 | ||||
1591 | // C++20 [dcl.fct.default]p4: | |||
1592 | // In a given function declaration, each parameter subsequent to a parameter | |||
1593 | // with a default argument shall have a default argument supplied in this or | |||
1594 | // a previous declaration, unless the parameter was expanded from a | |||
1595 | // parameter pack, or shall be a function parameter pack. | |||
1596 | for (; ParamIdx < NumParams; ++ParamIdx) { | |||
1597 | ParmVarDecl *Param = FD->getParamDecl(ParamIdx); | |||
1598 | if (!Param->hasDefaultArg() && !Param->isParameterPack() && | |||
1599 | !(CurrentInstantiationScope && | |||
1600 | CurrentInstantiationScope->isLocalPackExpansion(Param))) { | |||
1601 | if (Param->isInvalidDecl()) | |||
1602 | /* We already complained about this parameter. */; | |||
1603 | else if (Param->getIdentifier()) | |||
1604 | Diag(Param->getLocation(), | |||
1605 | diag::err_param_default_argument_missing_name) | |||
1606 | << Param->getIdentifier(); | |||
1607 | else | |||
1608 | Diag(Param->getLocation(), | |||
1609 | diag::err_param_default_argument_missing); | |||
1610 | } | |||
1611 | } | |||
1612 | } | |||
1613 | ||||
1614 | /// Check that the given type is a literal type. Issue a diagnostic if not, | |||
1615 | /// if Kind is Diagnose. | |||
1616 | /// \return \c true if a problem has been found (and optionally diagnosed). | |||
1617 | template <typename... Ts> | |||
1618 | static bool CheckLiteralType(Sema &SemaRef, Sema::CheckConstexprKind Kind, | |||
1619 | SourceLocation Loc, QualType T, unsigned DiagID, | |||
1620 | Ts &&...DiagArgs) { | |||
1621 | if (T->isDependentType()) | |||
1622 | return false; | |||
1623 | ||||
1624 | switch (Kind) { | |||
1625 | case Sema::CheckConstexprKind::Diagnose: | |||
1626 | return SemaRef.RequireLiteralType(Loc, T, DiagID, | |||
1627 | std::forward<Ts>(DiagArgs)...); | |||
1628 | ||||
1629 | case Sema::CheckConstexprKind::CheckValid: | |||
1630 | return !T->isLiteralType(SemaRef.Context); | |||
1631 | } | |||
1632 | ||||
1633 | llvm_unreachable("unknown CheckConstexprKind")::llvm::llvm_unreachable_internal("unknown CheckConstexprKind" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 1633); | |||
1634 | } | |||
1635 | ||||
1636 | /// Determine whether a destructor cannot be constexpr due to | |||
1637 | static bool CheckConstexprDestructorSubobjects(Sema &SemaRef, | |||
1638 | const CXXDestructorDecl *DD, | |||
1639 | Sema::CheckConstexprKind Kind) { | |||
1640 | auto Check = [&](SourceLocation Loc, QualType T, const FieldDecl *FD) { | |||
1641 | const CXXRecordDecl *RD = | |||
1642 | T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl(); | |||
1643 | if (!RD || RD->hasConstexprDestructor()) | |||
1644 | return true; | |||
1645 | ||||
1646 | if (Kind == Sema::CheckConstexprKind::Diagnose) { | |||
1647 | SemaRef.Diag(DD->getLocation(), diag::err_constexpr_dtor_subobject) | |||
1648 | << static_cast<int>(DD->getConstexprKind()) << !FD | |||
1649 | << (FD ? FD->getDeclName() : DeclarationName()) << T; | |||
1650 | SemaRef.Diag(Loc, diag::note_constexpr_dtor_subobject) | |||
1651 | << !FD << (FD ? FD->getDeclName() : DeclarationName()) << T; | |||
1652 | } | |||
1653 | return false; | |||
1654 | }; | |||
1655 | ||||
1656 | const CXXRecordDecl *RD = DD->getParent(); | |||
1657 | for (const CXXBaseSpecifier &B : RD->bases()) | |||
1658 | if (!Check(B.getBaseTypeLoc(), B.getType(), nullptr)) | |||
1659 | return false; | |||
1660 | for (const FieldDecl *FD : RD->fields()) | |||
1661 | if (!Check(FD->getLocation(), FD->getType(), FD)) | |||
1662 | return false; | |||
1663 | return true; | |||
1664 | } | |||
1665 | ||||
1666 | /// Check whether a function's parameter types are all literal types. If so, | |||
1667 | /// return true. If not, produce a suitable diagnostic and return false. | |||
1668 | static bool CheckConstexprParameterTypes(Sema &SemaRef, | |||
1669 | const FunctionDecl *FD, | |||
1670 | Sema::CheckConstexprKind Kind) { | |||
1671 | unsigned ArgIndex = 0; | |||
1672 | const auto *FT = FD->getType()->castAs<FunctionProtoType>(); | |||
1673 | for (FunctionProtoType::param_type_iterator i = FT->param_type_begin(), | |||
1674 | e = FT->param_type_end(); | |||
1675 | i != e; ++i, ++ArgIndex) { | |||
1676 | const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); | |||
1677 | SourceLocation ParamLoc = PD->getLocation(); | |||
1678 | if (CheckLiteralType(SemaRef, Kind, ParamLoc, *i, | |||
1679 | diag::err_constexpr_non_literal_param, ArgIndex + 1, | |||
1680 | PD->getSourceRange(), isa<CXXConstructorDecl>(FD), | |||
1681 | FD->isConsteval())) | |||
1682 | return false; | |||
1683 | } | |||
1684 | return true; | |||
1685 | } | |||
1686 | ||||
1687 | /// Check whether a function's return type is a literal type. If so, return | |||
1688 | /// true. If not, produce a suitable diagnostic and return false. | |||
1689 | static bool CheckConstexprReturnType(Sema &SemaRef, const FunctionDecl *FD, | |||
1690 | Sema::CheckConstexprKind Kind) { | |||
1691 | if (CheckLiteralType(SemaRef, Kind, FD->getLocation(), FD->getReturnType(), | |||
1692 | diag::err_constexpr_non_literal_return, | |||
1693 | FD->isConsteval())) | |||
1694 | return false; | |||
1695 | return true; | |||
1696 | } | |||
1697 | ||||
1698 | /// Get diagnostic %select index for tag kind for | |||
1699 | /// record diagnostic message. | |||
1700 | /// WARNING: Indexes apply to particular diagnostics only! | |||
1701 | /// | |||
1702 | /// \returns diagnostic %select index. | |||
1703 | static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { | |||
1704 | switch (Tag) { | |||
1705 | case TTK_Struct: return 0; | |||
1706 | case TTK_Interface: return 1; | |||
1707 | case TTK_Class: return 2; | |||
1708 | default: llvm_unreachable("Invalid tag kind for record diagnostic!")::llvm::llvm_unreachable_internal("Invalid tag kind for record diagnostic!" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 1708); | |||
1709 | } | |||
1710 | } | |||
1711 | ||||
1712 | static bool CheckConstexprFunctionBody(Sema &SemaRef, const FunctionDecl *Dcl, | |||
1713 | Stmt *Body, | |||
1714 | Sema::CheckConstexprKind Kind); | |||
1715 | ||||
1716 | // Check whether a function declaration satisfies the requirements of a | |||
1717 | // constexpr function definition or a constexpr constructor definition. If so, | |||
1718 | // return true. If not, produce appropriate diagnostics (unless asked not to by | |||
1719 | // Kind) and return false. | |||
1720 | // | |||
1721 | // This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. | |||
1722 | bool Sema::CheckConstexprFunctionDefinition(const FunctionDecl *NewFD, | |||
1723 | CheckConstexprKind Kind) { | |||
1724 | const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); | |||
1725 | if (MD && MD->isInstance()) { | |||
1726 | // C++11 [dcl.constexpr]p4: | |||
1727 | // The definition of a constexpr constructor shall satisfy the following | |||
1728 | // constraints: | |||
1729 | // - the class shall not have any virtual base classes; | |||
1730 | // | |||
1731 | // FIXME: This only applies to constructors and destructors, not arbitrary | |||
1732 | // member functions. | |||
1733 | const CXXRecordDecl *RD = MD->getParent(); | |||
1734 | if (RD->getNumVBases()) { | |||
1735 | if (Kind == CheckConstexprKind::CheckValid) | |||
1736 | return false; | |||
1737 | ||||
1738 | Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) | |||
1739 | << isa<CXXConstructorDecl>(NewFD) | |||
1740 | << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); | |||
1741 | for (const auto &I : RD->vbases()) | |||
1742 | Diag(I.getBeginLoc(), diag::note_constexpr_virtual_base_here) | |||
1743 | << I.getSourceRange(); | |||
1744 | return false; | |||
1745 | } | |||
1746 | } | |||
1747 | ||||
1748 | if (!isa<CXXConstructorDecl>(NewFD)) { | |||
1749 | // C++11 [dcl.constexpr]p3: | |||
1750 | // The definition of a constexpr function shall satisfy the following | |||
1751 | // constraints: | |||
1752 | // - it shall not be virtual; (removed in C++20) | |||
1753 | const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); | |||
1754 | if (Method && Method->isVirtual()) { | |||
1755 | if (getLangOpts().CPlusPlus20) { | |||
1756 | if (Kind == CheckConstexprKind::Diagnose) | |||
1757 | Diag(Method->getLocation(), diag::warn_cxx17_compat_constexpr_virtual); | |||
1758 | } else { | |||
1759 | if (Kind == CheckConstexprKind::CheckValid) | |||
1760 | return false; | |||
1761 | ||||
1762 | Method = Method->getCanonicalDecl(); | |||
1763 | Diag(Method->getLocation(), diag::err_constexpr_virtual); | |||
1764 | ||||
1765 | // If it's not obvious why this function is virtual, find an overridden | |||
1766 | // function which uses the 'virtual' keyword. | |||
1767 | const CXXMethodDecl *WrittenVirtual = Method; | |||
1768 | while (!WrittenVirtual->isVirtualAsWritten()) | |||
1769 | WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); | |||
1770 | if (WrittenVirtual != Method) | |||
1771 | Diag(WrittenVirtual->getLocation(), | |||
1772 | diag::note_overridden_virtual_function); | |||
1773 | return false; | |||
1774 | } | |||
1775 | } | |||
1776 | ||||
1777 | // - its return type shall be a literal type; | |||
1778 | if (!CheckConstexprReturnType(*this, NewFD, Kind)) | |||
1779 | return false; | |||
1780 | } | |||
1781 | ||||
1782 | if (auto *Dtor = dyn_cast<CXXDestructorDecl>(NewFD)) { | |||
1783 | // A destructor can be constexpr only if the defaulted destructor could be; | |||
1784 | // we don't need to check the members and bases if we already know they all | |||
1785 | // have constexpr destructors. | |||
1786 | if (!Dtor->getParent()->defaultedDestructorIsConstexpr()) { | |||
1787 | if (Kind == CheckConstexprKind::CheckValid) | |||
1788 | return false; | |||
1789 | if (!CheckConstexprDestructorSubobjects(*this, Dtor, Kind)) | |||
1790 | return false; | |||
1791 | } | |||
1792 | } | |||
1793 | ||||
1794 | // - each of its parameter types shall be a literal type; | |||
1795 | if (!CheckConstexprParameterTypes(*this, NewFD, Kind)) | |||
1796 | return false; | |||
1797 | ||||
1798 | Stmt *Body = NewFD->getBody(); | |||
1799 | assert(Body &&((Body && "CheckConstexprFunctionDefinition called on function with no body" ) ? static_cast<void> (0) : __assert_fail ("Body && \"CheckConstexprFunctionDefinition called on function with no body\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 1800, __PRETTY_FUNCTION__)) | |||
1800 | "CheckConstexprFunctionDefinition called on function with no body")((Body && "CheckConstexprFunctionDefinition called on function with no body" ) ? static_cast<void> (0) : __assert_fail ("Body && \"CheckConstexprFunctionDefinition called on function with no body\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 1800, __PRETTY_FUNCTION__)); | |||
1801 | return CheckConstexprFunctionBody(*this, NewFD, Body, Kind); | |||
1802 | } | |||
1803 | ||||
1804 | /// Check the given declaration statement is legal within a constexpr function | |||
1805 | /// body. C++11 [dcl.constexpr]p3,p4, and C++1y [dcl.constexpr]p3. | |||
1806 | /// | |||
1807 | /// \return true if the body is OK (maybe only as an extension), false if we | |||
1808 | /// have diagnosed a problem. | |||
1809 | static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, | |||
1810 | DeclStmt *DS, SourceLocation &Cxx1yLoc, | |||
1811 | Sema::CheckConstexprKind Kind) { | |||
1812 | // C++11 [dcl.constexpr]p3 and p4: | |||
1813 | // The definition of a constexpr function(p3) or constructor(p4) [...] shall | |||
1814 | // contain only | |||
1815 | for (const auto *DclIt : DS->decls()) { | |||
1816 | switch (DclIt->getKind()) { | |||
1817 | case Decl::StaticAssert: | |||
1818 | case Decl::Using: | |||
1819 | case Decl::UsingShadow: | |||
1820 | case Decl::UsingDirective: | |||
1821 | case Decl::UnresolvedUsingTypename: | |||
1822 | case Decl::UnresolvedUsingValue: | |||
1823 | // - static_assert-declarations | |||
1824 | // - using-declarations, | |||
1825 | // - using-directives, | |||
1826 | continue; | |||
1827 | ||||
1828 | case Decl::Typedef: | |||
1829 | case Decl::TypeAlias: { | |||
1830 | // - typedef declarations and alias-declarations that do not define | |||
1831 | // classes or enumerations, | |||
1832 | const auto *TN = cast<TypedefNameDecl>(DclIt); | |||
1833 | if (TN->getUnderlyingType()->isVariablyModifiedType()) { | |||
1834 | // Don't allow variably-modified types in constexpr functions. | |||
1835 | if (Kind == Sema::CheckConstexprKind::Diagnose) { | |||
1836 | TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); | |||
1837 | SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) | |||
1838 | << TL.getSourceRange() << TL.getType() | |||
1839 | << isa<CXXConstructorDecl>(Dcl); | |||
1840 | } | |||
1841 | return false; | |||
1842 | } | |||
1843 | continue; | |||
1844 | } | |||
1845 | ||||
1846 | case Decl::Enum: | |||
1847 | case Decl::CXXRecord: | |||
1848 | // C++1y allows types to be defined, not just declared. | |||
1849 | if (cast<TagDecl>(DclIt)->isThisDeclarationADefinition()) { | |||
1850 | if (Kind == Sema::CheckConstexprKind::Diagnose) { | |||
1851 | SemaRef.Diag(DS->getBeginLoc(), | |||
1852 | SemaRef.getLangOpts().CPlusPlus14 | |||
1853 | ? diag::warn_cxx11_compat_constexpr_type_definition | |||
1854 | : diag::ext_constexpr_type_definition) | |||
1855 | << isa<CXXConstructorDecl>(Dcl); | |||
1856 | } else if (!SemaRef.getLangOpts().CPlusPlus14) { | |||
1857 | return false; | |||
1858 | } | |||
1859 | } | |||
1860 | continue; | |||
1861 | ||||
1862 | case Decl::EnumConstant: | |||
1863 | case Decl::IndirectField: | |||
1864 | case Decl::ParmVar: | |||
1865 | // These can only appear with other declarations which are banned in | |||
1866 | // C++11 and permitted in C++1y, so ignore them. | |||
1867 | continue; | |||
1868 | ||||
1869 | case Decl::Var: | |||
1870 | case Decl::Decomposition: { | |||
1871 | // C++1y [dcl.constexpr]p3 allows anything except: | |||
1872 | // a definition of a variable of non-literal type or of static or | |||
1873 | // thread storage duration or [before C++2a] for which no | |||
1874 | // initialization is performed. | |||
1875 | const auto *VD = cast<VarDecl>(DclIt); | |||
1876 | if (VD->isThisDeclarationADefinition()) { | |||
1877 | if (VD->isStaticLocal()) { | |||
1878 | if (Kind == Sema::CheckConstexprKind::Diagnose) { | |||
1879 | SemaRef.Diag(VD->getLocation(), | |||
1880 | diag::err_constexpr_local_var_static) | |||
1881 | << isa<CXXConstructorDecl>(Dcl) | |||
1882 | << (VD->getTLSKind() == VarDecl::TLS_Dynamic); | |||
1883 | } | |||
1884 | return false; | |||
1885 | } | |||
1886 | if (CheckLiteralType(SemaRef, Kind, VD->getLocation(), VD->getType(), | |||
1887 | diag::err_constexpr_local_var_non_literal_type, | |||
1888 | isa<CXXConstructorDecl>(Dcl))) | |||
1889 | return false; | |||
1890 | if (!VD->getType()->isDependentType() && | |||
1891 | !VD->hasInit() && !VD->isCXXForRangeDecl()) { | |||
1892 | if (Kind == Sema::CheckConstexprKind::Diagnose) { | |||
1893 | SemaRef.Diag( | |||
1894 | VD->getLocation(), | |||
1895 | SemaRef.getLangOpts().CPlusPlus20 | |||
1896 | ? diag::warn_cxx17_compat_constexpr_local_var_no_init | |||
1897 | : diag::ext_constexpr_local_var_no_init) | |||
1898 | << isa<CXXConstructorDecl>(Dcl); | |||
1899 | } else if (!SemaRef.getLangOpts().CPlusPlus20) { | |||
1900 | return false; | |||
1901 | } | |||
1902 | continue; | |||
1903 | } | |||
1904 | } | |||
1905 | if (Kind == Sema::CheckConstexprKind::Diagnose) { | |||
1906 | SemaRef.Diag(VD->getLocation(), | |||
1907 | SemaRef.getLangOpts().CPlusPlus14 | |||
1908 | ? diag::warn_cxx11_compat_constexpr_local_var | |||
1909 | : diag::ext_constexpr_local_var) | |||
1910 | << isa<CXXConstructorDecl>(Dcl); | |||
1911 | } else if (!SemaRef.getLangOpts().CPlusPlus14) { | |||
1912 | return false; | |||
1913 | } | |||
1914 | continue; | |||
1915 | } | |||
1916 | ||||
1917 | case Decl::NamespaceAlias: | |||
1918 | case Decl::Function: | |||
1919 | // These are disallowed in C++11 and permitted in C++1y. Allow them | |||
1920 | // everywhere as an extension. | |||
1921 | if (!Cxx1yLoc.isValid()) | |||
1922 | Cxx1yLoc = DS->getBeginLoc(); | |||
1923 | continue; | |||
1924 | ||||
1925 | default: | |||
1926 | if (Kind == Sema::CheckConstexprKind::Diagnose) { | |||
1927 | SemaRef.Diag(DS->getBeginLoc(), diag::err_constexpr_body_invalid_stmt) | |||
1928 | << isa<CXXConstructorDecl>(Dcl) << Dcl->isConsteval(); | |||
1929 | } | |||
1930 | return false; | |||
1931 | } | |||
1932 | } | |||
1933 | ||||
1934 | return true; | |||
1935 | } | |||
1936 | ||||
1937 | /// Check that the given field is initialized within a constexpr constructor. | |||
1938 | /// | |||
1939 | /// \param Dcl The constexpr constructor being checked. | |||
1940 | /// \param Field The field being checked. This may be a member of an anonymous | |||
1941 | /// struct or union nested within the class being checked. | |||
1942 | /// \param Inits All declarations, including anonymous struct/union members and | |||
1943 | /// indirect members, for which any initialization was provided. | |||
1944 | /// \param Diagnosed Whether we've emitted the error message yet. Used to attach | |||
1945 | /// multiple notes for different members to the same error. | |||
1946 | /// \param Kind Whether we're diagnosing a constructor as written or determining | |||
1947 | /// whether the formal requirements are satisfied. | |||
1948 | /// \return \c false if we're checking for validity and the constructor does | |||
1949 | /// not satisfy the requirements on a constexpr constructor. | |||
1950 | static bool CheckConstexprCtorInitializer(Sema &SemaRef, | |||
1951 | const FunctionDecl *Dcl, | |||
1952 | FieldDecl *Field, | |||
1953 | llvm::SmallSet<Decl*, 16> &Inits, | |||
1954 | bool &Diagnosed, | |||
1955 | Sema::CheckConstexprKind Kind) { | |||
1956 | // In C++20 onwards, there's nothing to check for validity. | |||
1957 | if (Kind == Sema::CheckConstexprKind::CheckValid && | |||
1958 | SemaRef.getLangOpts().CPlusPlus20) | |||
1959 | return true; | |||
1960 | ||||
1961 | if (Field->isInvalidDecl()) | |||
1962 | return true; | |||
1963 | ||||
1964 | if (Field->isUnnamedBitfield()) | |||
1965 | return true; | |||
1966 | ||||
1967 | // Anonymous unions with no variant members and empty anonymous structs do not | |||
1968 | // need to be explicitly initialized. FIXME: Anonymous structs that contain no | |||
1969 | // indirect fields don't need initializing. | |||
1970 | if (Field->isAnonymousStructOrUnion() && | |||
1971 | (Field->getType()->isUnionType() | |||
1972 | ? !Field->getType()->getAsCXXRecordDecl()->hasVariantMembers() | |||
1973 | : Field->getType()->getAsCXXRecordDecl()->isEmpty())) | |||
1974 | return true; | |||
1975 | ||||
1976 | if (!Inits.count(Field)) { | |||
1977 | if (Kind == Sema::CheckConstexprKind::Diagnose) { | |||
1978 | if (!Diagnosed) { | |||
1979 | SemaRef.Diag(Dcl->getLocation(), | |||
1980 | SemaRef.getLangOpts().CPlusPlus20 | |||
1981 | ? diag::warn_cxx17_compat_constexpr_ctor_missing_init | |||
1982 | : diag::ext_constexpr_ctor_missing_init); | |||
1983 | Diagnosed = true; | |||
1984 | } | |||
1985 | SemaRef.Diag(Field->getLocation(), | |||
1986 | diag::note_constexpr_ctor_missing_init); | |||
1987 | } else if (!SemaRef.getLangOpts().CPlusPlus20) { | |||
1988 | return false; | |||
1989 | } | |||
1990 | } else if (Field->isAnonymousStructOrUnion()) { | |||
1991 | const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); | |||
1992 | for (auto *I : RD->fields()) | |||
1993 | // If an anonymous union contains an anonymous struct of which any member | |||
1994 | // is initialized, all members must be initialized. | |||
1995 | if (!RD->isUnion() || Inits.count(I)) | |||
1996 | if (!CheckConstexprCtorInitializer(SemaRef, Dcl, I, Inits, Diagnosed, | |||
1997 | Kind)) | |||
1998 | return false; | |||
1999 | } | |||
2000 | return true; | |||
2001 | } | |||
2002 | ||||
2003 | /// Check the provided statement is allowed in a constexpr function | |||
2004 | /// definition. | |||
2005 | static bool | |||
2006 | CheckConstexprFunctionStmt(Sema &SemaRef, const FunctionDecl *Dcl, Stmt *S, | |||
2007 | SmallVectorImpl<SourceLocation> &ReturnStmts, | |||
2008 | SourceLocation &Cxx1yLoc, SourceLocation &Cxx2aLoc, | |||
2009 | Sema::CheckConstexprKind Kind) { | |||
2010 | // - its function-body shall be [...] a compound-statement that contains only | |||
2011 | switch (S->getStmtClass()) { | |||
2012 | case Stmt::NullStmtClass: | |||
2013 | // - null statements, | |||
2014 | return true; | |||
2015 | ||||
2016 | case Stmt::DeclStmtClass: | |||
2017 | // - static_assert-declarations | |||
2018 | // - using-declarations, | |||
2019 | // - using-directives, | |||
2020 | // - typedef declarations and alias-declarations that do not define | |||
2021 | // classes or enumerations, | |||
2022 | if (!CheckConstexprDeclStmt(SemaRef, Dcl, cast<DeclStmt>(S), Cxx1yLoc, Kind)) | |||
2023 | return false; | |||
2024 | return true; | |||
2025 | ||||
2026 | case Stmt::ReturnStmtClass: | |||
2027 | // - and exactly one return statement; | |||
2028 | if (isa<CXXConstructorDecl>(Dcl)) { | |||
2029 | // C++1y allows return statements in constexpr constructors. | |||
2030 | if (!Cxx1yLoc.isValid()) | |||
2031 | Cxx1yLoc = S->getBeginLoc(); | |||
2032 | return true; | |||
2033 | } | |||
2034 | ||||
2035 | ReturnStmts.push_back(S->getBeginLoc()); | |||
2036 | return true; | |||
2037 | ||||
2038 | case Stmt::CompoundStmtClass: { | |||
2039 | // C++1y allows compound-statements. | |||
2040 | if (!Cxx1yLoc.isValid()) | |||
2041 | Cxx1yLoc = S->getBeginLoc(); | |||
2042 | ||||
2043 | CompoundStmt *CompStmt = cast<CompoundStmt>(S); | |||
2044 | for (auto *BodyIt : CompStmt->body()) { | |||
2045 | if (!CheckConstexprFunctionStmt(SemaRef, Dcl, BodyIt, ReturnStmts, | |||
2046 | Cxx1yLoc, Cxx2aLoc, Kind)) | |||
2047 | return false; | |||
2048 | } | |||
2049 | return true; | |||
2050 | } | |||
2051 | ||||
2052 | case Stmt::AttributedStmtClass: | |||
2053 | if (!Cxx1yLoc.isValid()) | |||
2054 | Cxx1yLoc = S->getBeginLoc(); | |||
2055 | return true; | |||
2056 | ||||
2057 | case Stmt::IfStmtClass: { | |||
2058 | // C++1y allows if-statements. | |||
2059 | if (!Cxx1yLoc.isValid()) | |||
2060 | Cxx1yLoc = S->getBeginLoc(); | |||
2061 | ||||
2062 | IfStmt *If = cast<IfStmt>(S); | |||
2063 | if (!CheckConstexprFunctionStmt(SemaRef, Dcl, If->getThen(), ReturnStmts, | |||
2064 | Cxx1yLoc, Cxx2aLoc, Kind)) | |||
2065 | return false; | |||
2066 | if (If->getElse() && | |||
2067 | !CheckConstexprFunctionStmt(SemaRef, Dcl, If->getElse(), ReturnStmts, | |||
2068 | Cxx1yLoc, Cxx2aLoc, Kind)) | |||
2069 | return false; | |||
2070 | return true; | |||
2071 | } | |||
2072 | ||||
2073 | case Stmt::WhileStmtClass: | |||
2074 | case Stmt::DoStmtClass: | |||
2075 | case Stmt::ForStmtClass: | |||
2076 | case Stmt::CXXForRangeStmtClass: | |||
2077 | case Stmt::ContinueStmtClass: | |||
2078 | // C++1y allows all of these. We don't allow them as extensions in C++11, | |||
2079 | // because they don't make sense without variable mutation. | |||
2080 | if (!SemaRef.getLangOpts().CPlusPlus14) | |||
2081 | break; | |||
2082 | if (!Cxx1yLoc.isValid()) | |||
2083 | Cxx1yLoc = S->getBeginLoc(); | |||
2084 | for (Stmt *SubStmt : S->children()) | |||
2085 | if (SubStmt && | |||
2086 | !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts, | |||
2087 | Cxx1yLoc, Cxx2aLoc, Kind)) | |||
2088 | return false; | |||
2089 | return true; | |||
2090 | ||||
2091 | case Stmt::SwitchStmtClass: | |||
2092 | case Stmt::CaseStmtClass: | |||
2093 | case Stmt::DefaultStmtClass: | |||
2094 | case Stmt::BreakStmtClass: | |||
2095 | // C++1y allows switch-statements, and since they don't need variable | |||
2096 | // mutation, we can reasonably allow them in C++11 as an extension. | |||
2097 | if (!Cxx1yLoc.isValid()) | |||
2098 | Cxx1yLoc = S->getBeginLoc(); | |||
2099 | for (Stmt *SubStmt : S->children()) | |||
2100 | if (SubStmt && | |||
2101 | !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts, | |||
2102 | Cxx1yLoc, Cxx2aLoc, Kind)) | |||
2103 | return false; | |||
2104 | return true; | |||
2105 | ||||
2106 | case Stmt::GCCAsmStmtClass: | |||
2107 | case Stmt::MSAsmStmtClass: | |||
2108 | // C++2a allows inline assembly statements. | |||
2109 | case Stmt::CXXTryStmtClass: | |||
2110 | if (Cxx2aLoc.isInvalid()) | |||
2111 | Cxx2aLoc = S->getBeginLoc(); | |||
2112 | for (Stmt *SubStmt : S->children()) { | |||
2113 | if (SubStmt && | |||
2114 | !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts, | |||
2115 | Cxx1yLoc, Cxx2aLoc, Kind)) | |||
2116 | return false; | |||
2117 | } | |||
2118 | return true; | |||
2119 | ||||
2120 | case Stmt::CXXCatchStmtClass: | |||
2121 | // Do not bother checking the language mode (already covered by the | |||
2122 | // try block check). | |||
2123 | if (!CheckConstexprFunctionStmt(SemaRef, Dcl, | |||
2124 | cast<CXXCatchStmt>(S)->getHandlerBlock(), | |||
2125 | ReturnStmts, Cxx1yLoc, Cxx2aLoc, Kind)) | |||
2126 | return false; | |||
2127 | return true; | |||
2128 | ||||
2129 | default: | |||
2130 | if (!isa<Expr>(S)) | |||
2131 | break; | |||
2132 | ||||
2133 | // C++1y allows expression-statements. | |||
2134 | if (!Cxx1yLoc.isValid()) | |||
2135 | Cxx1yLoc = S->getBeginLoc(); | |||
2136 | return true; | |||
2137 | } | |||
2138 | ||||
2139 | if (Kind == Sema::CheckConstexprKind::Diagnose) { | |||
2140 | SemaRef.Diag(S->getBeginLoc(), diag::err_constexpr_body_invalid_stmt) | |||
2141 | << isa<CXXConstructorDecl>(Dcl) << Dcl->isConsteval(); | |||
2142 | } | |||
2143 | return false; | |||
2144 | } | |||
2145 | ||||
2146 | /// Check the body for the given constexpr function declaration only contains | |||
2147 | /// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. | |||
2148 | /// | |||
2149 | /// \return true if the body is OK, false if we have found or diagnosed a | |||
2150 | /// problem. | |||
2151 | static bool CheckConstexprFunctionBody(Sema &SemaRef, const FunctionDecl *Dcl, | |||
2152 | Stmt *Body, | |||
2153 | Sema::CheckConstexprKind Kind) { | |||
2154 | SmallVector<SourceLocation, 4> ReturnStmts; | |||
2155 | ||||
2156 | if (isa<CXXTryStmt>(Body)) { | |||
2157 | // C++11 [dcl.constexpr]p3: | |||
2158 | // The definition of a constexpr function shall satisfy the following | |||
2159 | // constraints: [...] | |||
2160 | // - its function-body shall be = delete, = default, or a | |||
2161 | // compound-statement | |||
2162 | // | |||
2163 | // C++11 [dcl.constexpr]p4: | |||
2164 | // In the definition of a constexpr constructor, [...] | |||
2165 | // - its function-body shall not be a function-try-block; | |||
2166 | // | |||
2167 | // This restriction is lifted in C++2a, as long as inner statements also | |||
2168 | // apply the general constexpr rules. | |||
2169 | switch (Kind) { | |||
2170 | case Sema::CheckConstexprKind::CheckValid: | |||
2171 | if (!SemaRef.getLangOpts().CPlusPlus20) | |||
2172 | return false; | |||
2173 | break; | |||
2174 | ||||
2175 | case Sema::CheckConstexprKind::Diagnose: | |||
2176 | SemaRef.Diag(Body->getBeginLoc(), | |||
2177 | !SemaRef.getLangOpts().CPlusPlus20 | |||
2178 | ? diag::ext_constexpr_function_try_block_cxx20 | |||
2179 | : diag::warn_cxx17_compat_constexpr_function_try_block) | |||
2180 | << isa<CXXConstructorDecl>(Dcl); | |||
2181 | break; | |||
2182 | } | |||
2183 | } | |||
2184 | ||||
2185 | // - its function-body shall be [...] a compound-statement that contains only | |||
2186 | // [... list of cases ...] | |||
2187 | // | |||
2188 | // Note that walking the children here is enough to properly check for | |||
2189 | // CompoundStmt and CXXTryStmt body. | |||
2190 | SourceLocation Cxx1yLoc, Cxx2aLoc; | |||
2191 | for (Stmt *SubStmt : Body->children()) { | |||
2192 | if (SubStmt && | |||
2193 | !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts, | |||
2194 | Cxx1yLoc, Cxx2aLoc, Kind)) | |||
2195 | return false; | |||
2196 | } | |||
2197 | ||||
2198 | if (Kind == Sema::CheckConstexprKind::CheckValid) { | |||
2199 | // If this is only valid as an extension, report that we don't satisfy the | |||
2200 | // constraints of the current language. | |||
2201 | if ((Cxx2aLoc.isValid() && !SemaRef.getLangOpts().CPlusPlus20) || | |||
2202 | (Cxx1yLoc.isValid() && !SemaRef.getLangOpts().CPlusPlus17)) | |||
2203 | return false; | |||
2204 | } else if (Cxx2aLoc.isValid()) { | |||
2205 | SemaRef.Diag(Cxx2aLoc, | |||
2206 | SemaRef.getLangOpts().CPlusPlus20 | |||
2207 | ? diag::warn_cxx17_compat_constexpr_body_invalid_stmt | |||
2208 | : diag::ext_constexpr_body_invalid_stmt_cxx20) | |||
2209 | << isa<CXXConstructorDecl>(Dcl); | |||
2210 | } else if (Cxx1yLoc.isValid()) { | |||
2211 | SemaRef.Diag(Cxx1yLoc, | |||
2212 | SemaRef.getLangOpts().CPlusPlus14 | |||
2213 | ? diag::warn_cxx11_compat_constexpr_body_invalid_stmt | |||
2214 | : diag::ext_constexpr_body_invalid_stmt) | |||
2215 | << isa<CXXConstructorDecl>(Dcl); | |||
2216 | } | |||
2217 | ||||
2218 | if (const CXXConstructorDecl *Constructor | |||
2219 | = dyn_cast<CXXConstructorDecl>(Dcl)) { | |||
2220 | const CXXRecordDecl *RD = Constructor->getParent(); | |||
2221 | // DR1359: | |||
2222 | // - every non-variant non-static data member and base class sub-object | |||
2223 | // shall be initialized; | |||
2224 | // DR1460: | |||
2225 | // - if the class is a union having variant members, exactly one of them | |||
2226 | // shall be initialized; | |||
2227 | if (RD->isUnion()) { | |||
2228 | if (Constructor->getNumCtorInitializers() == 0 && | |||
2229 | RD->hasVariantMembers()) { | |||
2230 | if (Kind == Sema::CheckConstexprKind::Diagnose) { | |||
2231 | SemaRef.Diag( | |||
2232 | Dcl->getLocation(), | |||
2233 | SemaRef.getLangOpts().CPlusPlus20 | |||
2234 | ? diag::warn_cxx17_compat_constexpr_union_ctor_no_init | |||
2235 | : diag::ext_constexpr_union_ctor_no_init); | |||
2236 | } else if (!SemaRef.getLangOpts().CPlusPlus20) { | |||
2237 | return false; | |||
2238 | } | |||
2239 | } | |||
2240 | } else if (!Constructor->isDependentContext() && | |||
2241 | !Constructor->isDelegatingConstructor()) { | |||
2242 | assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases")((RD->getNumVBases() == 0 && "constexpr ctor with virtual bases" ) ? static_cast<void> (0) : __assert_fail ("RD->getNumVBases() == 0 && \"constexpr ctor with virtual bases\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 2242, __PRETTY_FUNCTION__)); | |||
2243 | ||||
2244 | // Skip detailed checking if we have enough initializers, and we would | |||
2245 | // allow at most one initializer per member. | |||
2246 | bool AnyAnonStructUnionMembers = false; | |||
2247 | unsigned Fields = 0; | |||
2248 | for (CXXRecordDecl::field_iterator I = RD->field_begin(), | |||
2249 | E = RD->field_end(); I != E; ++I, ++Fields) { | |||
2250 | if (I->isAnonymousStructOrUnion()) { | |||
2251 | AnyAnonStructUnionMembers = true; | |||
2252 | break; | |||
2253 | } | |||
2254 | } | |||
2255 | // DR1460: | |||
2256 | // - if the class is a union-like class, but is not a union, for each of | |||
2257 | // its anonymous union members having variant members, exactly one of | |||
2258 | // them shall be initialized; | |||
2259 | if (AnyAnonStructUnionMembers || | |||
2260 | Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { | |||
2261 | // Check initialization of non-static data members. Base classes are | |||
2262 | // always initialized so do not need to be checked. Dependent bases | |||
2263 | // might not have initializers in the member initializer list. | |||
2264 | llvm::SmallSet<Decl*, 16> Inits; | |||
2265 | for (const auto *I: Constructor->inits()) { | |||
2266 | if (FieldDecl *FD = I->getMember()) | |||
2267 | Inits.insert(FD); | |||
2268 | else if (IndirectFieldDecl *ID = I->getIndirectMember()) | |||
2269 | Inits.insert(ID->chain_begin(), ID->chain_end()); | |||
2270 | } | |||
2271 | ||||
2272 | bool Diagnosed = false; | |||
2273 | for (auto *I : RD->fields()) | |||
2274 | if (!CheckConstexprCtorInitializer(SemaRef, Dcl, I, Inits, Diagnosed, | |||
2275 | Kind)) | |||
2276 | return false; | |||
2277 | } | |||
2278 | } | |||
2279 | } else { | |||
2280 | if (ReturnStmts.empty()) { | |||
2281 | // C++1y doesn't require constexpr functions to contain a 'return' | |||
2282 | // statement. We still do, unless the return type might be void, because | |||
2283 | // otherwise if there's no return statement, the function cannot | |||
2284 | // be used in a core constant expression. | |||
2285 | bool OK = SemaRef.getLangOpts().CPlusPlus14 && | |||
2286 | (Dcl->getReturnType()->isVoidType() || | |||
2287 | Dcl->getReturnType()->isDependentType()); | |||
2288 | switch (Kind) { | |||
2289 | case Sema::CheckConstexprKind::Diagnose: | |||
2290 | SemaRef.Diag(Dcl->getLocation(), | |||
2291 | OK ? diag::warn_cxx11_compat_constexpr_body_no_return | |||
2292 | : diag::err_constexpr_body_no_return) | |||
2293 | << Dcl->isConsteval(); | |||
2294 | if (!OK) | |||
2295 | return false; | |||
2296 | break; | |||
2297 | ||||
2298 | case Sema::CheckConstexprKind::CheckValid: | |||
2299 | // The formal requirements don't include this rule in C++14, even | |||
2300 | // though the "must be able to produce a constant expression" rules | |||
2301 | // still imply it in some cases. | |||
2302 | if (!SemaRef.getLangOpts().CPlusPlus14) | |||
2303 | return false; | |||
2304 | break; | |||
2305 | } | |||
2306 | } else if (ReturnStmts.size() > 1) { | |||
2307 | switch (Kind) { | |||
2308 | case Sema::CheckConstexprKind::Diagnose: | |||
2309 | SemaRef.Diag( | |||
2310 | ReturnStmts.back(), | |||
2311 | SemaRef.getLangOpts().CPlusPlus14 | |||
2312 | ? diag::warn_cxx11_compat_constexpr_body_multiple_return | |||
2313 | : diag::ext_constexpr_body_multiple_return); | |||
2314 | for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) | |||
2315 | SemaRef.Diag(ReturnStmts[I], | |||
2316 | diag::note_constexpr_body_previous_return); | |||
2317 | break; | |||
2318 | ||||
2319 | case Sema::CheckConstexprKind::CheckValid: | |||
2320 | if (!SemaRef.getLangOpts().CPlusPlus14) | |||
2321 | return false; | |||
2322 | break; | |||
2323 | } | |||
2324 | } | |||
2325 | } | |||
2326 | ||||
2327 | // C++11 [dcl.constexpr]p5: | |||
2328 | // if no function argument values exist such that the function invocation | |||
2329 | // substitution would produce a constant expression, the program is | |||
2330 | // ill-formed; no diagnostic required. | |||
2331 | // C++11 [dcl.constexpr]p3: | |||
2332 | // - every constructor call and implicit conversion used in initializing the | |||
2333 | // return value shall be one of those allowed in a constant expression. | |||
2334 | // C++11 [dcl.constexpr]p4: | |||
2335 | // - every constructor involved in initializing non-static data members and | |||
2336 | // base class sub-objects shall be a constexpr constructor. | |||
2337 | // | |||
2338 | // Note that this rule is distinct from the "requirements for a constexpr | |||
2339 | // function", so is not checked in CheckValid mode. | |||
2340 | SmallVector<PartialDiagnosticAt, 8> Diags; | |||
2341 | if (Kind == Sema::CheckConstexprKind::Diagnose && | |||
2342 | !Expr::isPotentialConstantExpr(Dcl, Diags)) { | |||
2343 | SemaRef.Diag(Dcl->getLocation(), | |||
2344 | diag::ext_constexpr_function_never_constant_expr) | |||
2345 | << isa<CXXConstructorDecl>(Dcl) << Dcl->isConsteval(); | |||
2346 | for (size_t I = 0, N = Diags.size(); I != N; ++I) | |||
2347 | SemaRef.Diag(Diags[I].first, Diags[I].second); | |||
2348 | // Don't return false here: we allow this for compatibility in | |||
2349 | // system headers. | |||
2350 | } | |||
2351 | ||||
2352 | return true; | |||
2353 | } | |||
2354 | ||||
2355 | /// Get the class that is directly named by the current context. This is the | |||
2356 | /// class for which an unqualified-id in this scope could name a constructor | |||
2357 | /// or destructor. | |||
2358 | /// | |||
2359 | /// If the scope specifier denotes a class, this will be that class. | |||
2360 | /// If the scope specifier is empty, this will be the class whose | |||
2361 | /// member-specification we are currently within. Otherwise, there | |||
2362 | /// is no such class. | |||
2363 | CXXRecordDecl *Sema::getCurrentClass(Scope *, const CXXScopeSpec *SS) { | |||
2364 | assert(getLangOpts().CPlusPlus && "No class names in C!")((getLangOpts().CPlusPlus && "No class names in C!") ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"No class names in C!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 2364, __PRETTY_FUNCTION__)); | |||
2365 | ||||
2366 | if (SS && SS->isInvalid()) | |||
2367 | return nullptr; | |||
2368 | ||||
2369 | if (SS && SS->isNotEmpty()) { | |||
2370 | DeclContext *DC = computeDeclContext(*SS, true); | |||
2371 | return dyn_cast_or_null<CXXRecordDecl>(DC); | |||
2372 | } | |||
2373 | ||||
2374 | return dyn_cast_or_null<CXXRecordDecl>(CurContext); | |||
2375 | } | |||
2376 | ||||
2377 | /// isCurrentClassName - Determine whether the identifier II is the | |||
2378 | /// name of the class type currently being defined. In the case of | |||
2379 | /// nested classes, this will only return true if II is the name of | |||
2380 | /// the innermost class. | |||
2381 | bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *S, | |||
2382 | const CXXScopeSpec *SS) { | |||
2383 | CXXRecordDecl *CurDecl = getCurrentClass(S, SS); | |||
2384 | return CurDecl && &II == CurDecl->getIdentifier(); | |||
2385 | } | |||
2386 | ||||
2387 | /// Determine whether the identifier II is a typo for the name of | |||
2388 | /// the class type currently being defined. If so, update it to the identifier | |||
2389 | /// that should have been used. | |||
2390 | bool Sema::isCurrentClassNameTypo(IdentifierInfo *&II, const CXXScopeSpec *SS) { | |||
2391 | assert(getLangOpts().CPlusPlus && "No class names in C!")((getLangOpts().CPlusPlus && "No class names in C!") ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"No class names in C!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 2391, __PRETTY_FUNCTION__)); | |||
2392 | ||||
2393 | if (!getLangOpts().SpellChecking) | |||
2394 | return false; | |||
2395 | ||||
2396 | CXXRecordDecl *CurDecl; | |||
2397 | if (SS && SS->isSet() && !SS->isInvalid()) { | |||
2398 | DeclContext *DC = computeDeclContext(*SS, true); | |||
2399 | CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); | |||
2400 | } else | |||
2401 | CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); | |||
2402 | ||||
2403 | if (CurDecl && CurDecl->getIdentifier() && II != CurDecl->getIdentifier() && | |||
2404 | 3 * II->getName().edit_distance(CurDecl->getIdentifier()->getName()) | |||
2405 | < II->getLength()) { | |||
2406 | II = CurDecl->getIdentifier(); | |||
2407 | return true; | |||
2408 | } | |||
2409 | ||||
2410 | return false; | |||
2411 | } | |||
2412 | ||||
2413 | /// Determine whether the given class is a base class of the given | |||
2414 | /// class, including looking at dependent bases. | |||
2415 | static bool findCircularInheritance(const CXXRecordDecl *Class, | |||
2416 | const CXXRecordDecl *Current) { | |||
2417 | SmallVector<const CXXRecordDecl*, 8> Queue; | |||
2418 | ||||
2419 | Class = Class->getCanonicalDecl(); | |||
2420 | while (true) { | |||
2421 | for (const auto &I : Current->bases()) { | |||
2422 | CXXRecordDecl *Base = I.getType()->getAsCXXRecordDecl(); | |||
2423 | if (!Base) | |||
2424 | continue; | |||
2425 | ||||
2426 | Base = Base->getDefinition(); | |||
2427 | if (!Base) | |||
2428 | continue; | |||
2429 | ||||
2430 | if (Base->getCanonicalDecl() == Class) | |||
2431 | return true; | |||
2432 | ||||
2433 | Queue.push_back(Base); | |||
2434 | } | |||
2435 | ||||
2436 | if (Queue.empty()) | |||
2437 | return false; | |||
2438 | ||||
2439 | Current = Queue.pop_back_val(); | |||
2440 | } | |||
2441 | ||||
2442 | return false; | |||
2443 | } | |||
2444 | ||||
2445 | /// Check the validity of a C++ base class specifier. | |||
2446 | /// | |||
2447 | /// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics | |||
2448 | /// and returns NULL otherwise. | |||
2449 | CXXBaseSpecifier * | |||
2450 | Sema::CheckBaseSpecifier(CXXRecordDecl *Class, | |||
2451 | SourceRange SpecifierRange, | |||
2452 | bool Virtual, AccessSpecifier Access, | |||
2453 | TypeSourceInfo *TInfo, | |||
2454 | SourceLocation EllipsisLoc) { | |||
2455 | QualType BaseType = TInfo->getType(); | |||
2456 | if (BaseType->containsErrors()) { | |||
2457 | // Already emitted a diagnostic when parsing the error type. | |||
2458 | return nullptr; | |||
2459 | } | |||
2460 | // C++ [class.union]p1: | |||
2461 | // A union shall not have base classes. | |||
2462 | if (Class->isUnion()) { | |||
2463 | Diag(Class->getLocation(), diag::err_base_clause_on_union) | |||
2464 | << SpecifierRange; | |||
2465 | return nullptr; | |||
2466 | } | |||
2467 | ||||
2468 | if (EllipsisLoc.isValid() && | |||
2469 | !TInfo->getType()->containsUnexpandedParameterPack()) { | |||
2470 | Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) | |||
2471 | << TInfo->getTypeLoc().getSourceRange(); | |||
2472 | EllipsisLoc = SourceLocation(); | |||
2473 | } | |||
2474 | ||||
2475 | SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); | |||
2476 | ||||
2477 | if (BaseType->isDependentType()) { | |||
2478 | // Make sure that we don't have circular inheritance among our dependent | |||
2479 | // bases. For non-dependent bases, the check for completeness below handles | |||
2480 | // this. | |||
2481 | if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { | |||
2482 | if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || | |||
2483 | ((BaseDecl = BaseDecl->getDefinition()) && | |||
2484 | findCircularInheritance(Class, BaseDecl))) { | |||
2485 | Diag(BaseLoc, diag::err_circular_inheritance) | |||
2486 | << BaseType << Context.getTypeDeclType(Class); | |||
2487 | ||||
2488 | if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) | |||
2489 | Diag(BaseDecl->getLocation(), diag::note_previous_decl) | |||
2490 | << BaseType; | |||
2491 | ||||
2492 | return nullptr; | |||
2493 | } | |||
2494 | } | |||
2495 | ||||
2496 | return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, | |||
2497 | Class->getTagKind() == TTK_Class, | |||
2498 | Access, TInfo, EllipsisLoc); | |||
2499 | } | |||
2500 | ||||
2501 | // Base specifiers must be record types. | |||
2502 | if (!BaseType->isRecordType()) { | |||
2503 | Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; | |||
2504 | return nullptr; | |||
2505 | } | |||
2506 | ||||
2507 | // C++ [class.union]p1: | |||
2508 | // A union shall not be used as a base class. | |||
2509 | if (BaseType->isUnionType()) { | |||
2510 | Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; | |||
2511 | return nullptr; | |||
2512 | } | |||
2513 | ||||
2514 | // For the MS ABI, propagate DLL attributes to base class templates. | |||
2515 | if (Context.getTargetInfo().getCXXABI().isMicrosoft()) { | |||
2516 | if (Attr *ClassAttr = getDLLAttr(Class)) { | |||
2517 | if (auto *BaseTemplate = dyn_cast_or_null<ClassTemplateSpecializationDecl>( | |||
2518 | BaseType->getAsCXXRecordDecl())) { | |||
2519 | propagateDLLAttrToBaseClassTemplate(Class, ClassAttr, BaseTemplate, | |||
2520 | BaseLoc); | |||
2521 | } | |||
2522 | } | |||
2523 | } | |||
2524 | ||||
2525 | // C++ [class.derived]p2: | |||
2526 | // The class-name in a base-specifier shall not be an incompletely | |||
2527 | // defined class. | |||
2528 | if (RequireCompleteType(BaseLoc, BaseType, | |||
2529 | diag::err_incomplete_base_class, SpecifierRange)) { | |||
2530 | Class->setInvalidDecl(); | |||
2531 | return nullptr; | |||
2532 | } | |||
2533 | ||||
2534 | // If the base class is polymorphic or isn't empty, the new one is/isn't, too. | |||
2535 | RecordDecl *BaseDecl = BaseType->castAs<RecordType>()->getDecl(); | |||
2536 | assert(BaseDecl && "Record type has no declaration")((BaseDecl && "Record type has no declaration") ? static_cast <void> (0) : __assert_fail ("BaseDecl && \"Record type has no declaration\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 2536, __PRETTY_FUNCTION__)); | |||
2537 | BaseDecl = BaseDecl->getDefinition(); | |||
2538 | assert(BaseDecl && "Base type is not incomplete, but has no definition")((BaseDecl && "Base type is not incomplete, but has no definition" ) ? static_cast<void> (0) : __assert_fail ("BaseDecl && \"Base type is not incomplete, but has no definition\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 2538, __PRETTY_FUNCTION__)); | |||
2539 | CXXRecordDecl *CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); | |||
2540 | assert(CXXBaseDecl && "Base type is not a C++ type")((CXXBaseDecl && "Base type is not a C++ type") ? static_cast <void> (0) : __assert_fail ("CXXBaseDecl && \"Base type is not a C++ type\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 2540, __PRETTY_FUNCTION__)); | |||
2541 | ||||
2542 | // Microsoft docs say: | |||
2543 | // "If a base-class has a code_seg attribute, derived classes must have the | |||
2544 | // same attribute." | |||
2545 | const auto *BaseCSA = CXXBaseDecl->getAttr<CodeSegAttr>(); | |||
2546 | const auto *DerivedCSA = Class->getAttr<CodeSegAttr>(); | |||
2547 | if ((DerivedCSA || BaseCSA) && | |||
2548 | (!BaseCSA || !DerivedCSA || BaseCSA->getName() != DerivedCSA->getName())) { | |||
2549 | Diag(Class->getLocation(), diag::err_mismatched_code_seg_base); | |||
2550 | Diag(CXXBaseDecl->getLocation(), diag::note_base_class_specified_here) | |||
2551 | << CXXBaseDecl; | |||
2552 | return nullptr; | |||
2553 | } | |||
2554 | ||||
2555 | // A class which contains a flexible array member is not suitable for use as a | |||
2556 | // base class: | |||
2557 | // - If the layout determines that a base comes before another base, | |||
2558 | // the flexible array member would index into the subsequent base. | |||
2559 | // - If the layout determines that base comes before the derived class, | |||
2560 | // the flexible array member would index into the derived class. | |||
2561 | if (CXXBaseDecl->hasFlexibleArrayMember()) { | |||
2562 | Diag(BaseLoc, diag::err_base_class_has_flexible_array_member) | |||
2563 | << CXXBaseDecl->getDeclName(); | |||
2564 | return nullptr; | |||
2565 | } | |||
2566 | ||||
2567 | // C++ [class]p3: | |||
2568 | // If a class is marked final and it appears as a base-type-specifier in | |||
2569 | // base-clause, the program is ill-formed. | |||
2570 | if (FinalAttr *FA = CXXBaseDecl->getAttr<FinalAttr>()) { | |||
2571 | Diag(BaseLoc, diag::err_class_marked_final_used_as_base) | |||
2572 | << CXXBaseDecl->getDeclName() | |||
2573 | << FA->isSpelledAsSealed(); | |||
2574 | Diag(CXXBaseDecl->getLocation(), diag::note_entity_declared_at) | |||
2575 | << CXXBaseDecl->getDeclName() << FA->getRange(); | |||
2576 | return nullptr; | |||
2577 | } | |||
2578 | ||||
2579 | if (BaseDecl->isInvalidDecl()) | |||
2580 | Class->setInvalidDecl(); | |||
2581 | ||||
2582 | // Create the base specifier. | |||
2583 | return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, | |||
2584 | Class->getTagKind() == TTK_Class, | |||
2585 | Access, TInfo, EllipsisLoc); | |||
2586 | } | |||
2587 | ||||
2588 | /// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is | |||
2589 | /// one entry in the base class list of a class specifier, for | |||
2590 | /// example: | |||
2591 | /// class foo : public bar, virtual private baz { | |||
2592 | /// 'public bar' and 'virtual private baz' are each base-specifiers. | |||
2593 | BaseResult | |||
2594 | Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, | |||
2595 | ParsedAttributes &Attributes, | |||
2596 | bool Virtual, AccessSpecifier Access, | |||
2597 | ParsedType basetype, SourceLocation BaseLoc, | |||
2598 | SourceLocation EllipsisLoc) { | |||
2599 | if (!classdecl) | |||
2600 | return true; | |||
2601 | ||||
2602 | AdjustDeclIfTemplate(classdecl); | |||
2603 | CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); | |||
2604 | if (!Class) | |||
2605 | return true; | |||
2606 | ||||
2607 | // We haven't yet attached the base specifiers. | |||
2608 | Class->setIsParsingBaseSpecifiers(); | |||
2609 | ||||
2610 | // We do not support any C++11 attributes on base-specifiers yet. | |||
2611 | // Diagnose any attributes we see. | |||
2612 | for (const ParsedAttr &AL : Attributes) { | |||
2613 | if (AL.isInvalid() || AL.getKind() == ParsedAttr::IgnoredAttribute) | |||
2614 | continue; | |||
2615 | Diag(AL.getLoc(), AL.getKind() == ParsedAttr::UnknownAttribute | |||
2616 | ? (unsigned)diag::warn_unknown_attribute_ignored | |||
2617 | : (unsigned)diag::err_base_specifier_attribute) | |||
2618 | << AL << AL.getRange(); | |||
2619 | } | |||
2620 | ||||
2621 | TypeSourceInfo *TInfo = nullptr; | |||
2622 | GetTypeFromParser(basetype, &TInfo); | |||
2623 | ||||
2624 | if (EllipsisLoc.isInvalid() && | |||
2625 | DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, | |||
2626 | UPPC_BaseType)) | |||
2627 | return true; | |||
2628 | ||||
2629 | if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, | |||
2630 | Virtual, Access, TInfo, | |||
2631 | EllipsisLoc)) | |||
2632 | return BaseSpec; | |||
2633 | else | |||
2634 | Class->setInvalidDecl(); | |||
2635 | ||||
2636 | return true; | |||
2637 | } | |||
2638 | ||||
2639 | /// Use small set to collect indirect bases. As this is only used | |||
2640 | /// locally, there's no need to abstract the small size parameter. | |||
2641 | typedef llvm::SmallPtrSet<QualType, 4> IndirectBaseSet; | |||
2642 | ||||
2643 | /// Recursively add the bases of Type. Don't add Type itself. | |||
2644 | static void | |||
2645 | NoteIndirectBases(ASTContext &Context, IndirectBaseSet &Set, | |||
2646 | const QualType &Type) | |||
2647 | { | |||
2648 | // Even though the incoming type is a base, it might not be | |||
2649 | // a class -- it could be a template parm, for instance. | |||
2650 | if (auto Rec = Type->getAs<RecordType>()) { | |||
2651 | auto Decl = Rec->getAsCXXRecordDecl(); | |||
2652 | ||||
2653 | // Iterate over its bases. | |||
2654 | for (const auto &BaseSpec : Decl->bases()) { | |||
2655 | QualType Base = Context.getCanonicalType(BaseSpec.getType()) | |||
2656 | .getUnqualifiedType(); | |||
2657 | if (Set.insert(Base).second) | |||
2658 | // If we've not already seen it, recurse. | |||
2659 | NoteIndirectBases(Context, Set, Base); | |||
2660 | } | |||
2661 | } | |||
2662 | } | |||
2663 | ||||
2664 | /// Performs the actual work of attaching the given base class | |||
2665 | /// specifiers to a C++ class. | |||
2666 | bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, | |||
2667 | MutableArrayRef<CXXBaseSpecifier *> Bases) { | |||
2668 | if (Bases.empty()) | |||
2669 | return false; | |||
2670 | ||||
2671 | // Used to keep track of which base types we have already seen, so | |||
2672 | // that we can properly diagnose redundant direct base types. Note | |||
2673 | // that the key is always the unqualified canonical type of the base | |||
2674 | // class. | |||
2675 | std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; | |||
2676 | ||||
2677 | // Used to track indirect bases so we can see if a direct base is | |||
2678 | // ambiguous. | |||
2679 | IndirectBaseSet IndirectBaseTypes; | |||
2680 | ||||
2681 | // Copy non-redundant base specifiers into permanent storage. | |||
2682 | unsigned NumGoodBases = 0; | |||
2683 | bool Invalid = false; | |||
2684 | for (unsigned idx = 0; idx < Bases.size(); ++idx) { | |||
2685 | QualType NewBaseType | |||
2686 | = Context.getCanonicalType(Bases[idx]->getType()); | |||
2687 | NewBaseType = NewBaseType.getLocalUnqualifiedType(); | |||
2688 | ||||
2689 | CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; | |||
2690 | if (KnownBase) { | |||
2691 | // C++ [class.mi]p3: | |||
2692 | // A class shall not be specified as a direct base class of a | |||
2693 | // derived class more than once. | |||
2694 | Diag(Bases[idx]->getBeginLoc(), diag::err_duplicate_base_class) | |||
2695 | << KnownBase->getType() << Bases[idx]->getSourceRange(); | |||
2696 | ||||
2697 | // Delete the duplicate base class specifier; we're going to | |||
2698 | // overwrite its pointer later. | |||
2699 | Context.Deallocate(Bases[idx]); | |||
2700 | ||||
2701 | Invalid = true; | |||
2702 | } else { | |||
2703 | // Okay, add this new base class. | |||
2704 | KnownBase = Bases[idx]; | |||
2705 | Bases[NumGoodBases++] = Bases[idx]; | |||
2706 | ||||
2707 | // Note this base's direct & indirect bases, if there could be ambiguity. | |||
2708 | if (Bases.size() > 1) | |||
2709 | NoteIndirectBases(Context, IndirectBaseTypes, NewBaseType); | |||
2710 | ||||
2711 | if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { | |||
2712 | const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); | |||
2713 | if (Class->isInterface() && | |||
2714 | (!RD->isInterfaceLike() || | |||
2715 | KnownBase->getAccessSpecifier() != AS_public)) { | |||
2716 | // The Microsoft extension __interface does not permit bases that | |||
2717 | // are not themselves public interfaces. | |||
2718 | Diag(KnownBase->getBeginLoc(), diag::err_invalid_base_in_interface) | |||
2719 | << getRecordDiagFromTagKind(RD->getTagKind()) << RD | |||
2720 | << RD->getSourceRange(); | |||
2721 | Invalid = true; | |||
2722 | } | |||
2723 | if (RD->hasAttr<WeakAttr>()) | |||
2724 | Class->addAttr(WeakAttr::CreateImplicit(Context)); | |||
2725 | } | |||
2726 | } | |||
2727 | } | |||
2728 | ||||
2729 | // Attach the remaining base class specifiers to the derived class. | |||
2730 | Class->setBases(Bases.data(), NumGoodBases); | |||
2731 | ||||
2732 | // Check that the only base classes that are duplicate are virtual. | |||
2733 | for (unsigned idx = 0; idx < NumGoodBases; ++idx) { | |||
2734 | // Check whether this direct base is inaccessible due to ambiguity. | |||
2735 | QualType BaseType = Bases[idx]->getType(); | |||
2736 | ||||
2737 | // Skip all dependent types in templates being used as base specifiers. | |||
2738 | // Checks below assume that the base specifier is a CXXRecord. | |||
2739 | if (BaseType->isDependentType()) | |||
2740 | continue; | |||
2741 | ||||
2742 | CanQualType CanonicalBase = Context.getCanonicalType(BaseType) | |||
2743 | .getUnqualifiedType(); | |||
2744 | ||||
2745 | if (IndirectBaseTypes.count(CanonicalBase)) { | |||
2746 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, | |||
2747 | /*DetectVirtual=*/true); | |||
2748 | bool found | |||
2749 | = Class->isDerivedFrom(CanonicalBase->getAsCXXRecordDecl(), Paths); | |||
2750 | assert(found)((found) ? static_cast<void> (0) : __assert_fail ("found" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 2750, __PRETTY_FUNCTION__)); | |||
2751 | (void)found; | |||
2752 | ||||
2753 | if (Paths.isAmbiguous(CanonicalBase)) | |||
2754 | Diag(Bases[idx]->getBeginLoc(), diag::warn_inaccessible_base_class) | |||
2755 | << BaseType << getAmbiguousPathsDisplayString(Paths) | |||
2756 | << Bases[idx]->getSourceRange(); | |||
2757 | else | |||
2758 | assert(Bases[idx]->isVirtual())((Bases[idx]->isVirtual()) ? static_cast<void> (0) : __assert_fail ("Bases[idx]->isVirtual()", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 2758, __PRETTY_FUNCTION__)); | |||
2759 | } | |||
2760 | ||||
2761 | // Delete the base class specifier, since its data has been copied | |||
2762 | // into the CXXRecordDecl. | |||
2763 | Context.Deallocate(Bases[idx]); | |||
2764 | } | |||
2765 | ||||
2766 | return Invalid; | |||
2767 | } | |||
2768 | ||||
2769 | /// ActOnBaseSpecifiers - Attach the given base specifiers to the | |||
2770 | /// class, after checking whether there are any duplicate base | |||
2771 | /// classes. | |||
2772 | void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, | |||
2773 | MutableArrayRef<CXXBaseSpecifier *> Bases) { | |||
2774 | if (!ClassDecl || Bases.empty()) | |||
2775 | return; | |||
2776 | ||||
2777 | AdjustDeclIfTemplate(ClassDecl); | |||
2778 | AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), Bases); | |||
2779 | } | |||
2780 | ||||
2781 | /// Determine whether the type \p Derived is a C++ class that is | |||
2782 | /// derived from the type \p Base. | |||
2783 | bool Sema::IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base) { | |||
2784 | if (!getLangOpts().CPlusPlus) | |||
2785 | return false; | |||
2786 | ||||
2787 | CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); | |||
2788 | if (!DerivedRD) | |||
2789 | return false; | |||
2790 | ||||
2791 | CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); | |||
2792 | if (!BaseRD) | |||
2793 | return false; | |||
2794 | ||||
2795 | // If either the base or the derived type is invalid, don't try to | |||
2796 | // check whether one is derived from the other. | |||
2797 | if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl()) | |||
2798 | return false; | |||
2799 | ||||
2800 | // FIXME: In a modules build, do we need the entire path to be visible for us | |||
2801 | // to be able to use the inheritance relationship? | |||
2802 | if (!isCompleteType(Loc, Derived) && !DerivedRD->isBeingDefined()) | |||
2803 | return false; | |||
2804 | ||||
2805 | return DerivedRD->isDerivedFrom(BaseRD); | |||
2806 | } | |||
2807 | ||||
2808 | /// Determine whether the type \p Derived is a C++ class that is | |||
2809 | /// derived from the type \p Base. | |||
2810 | bool Sema::IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base, | |||
2811 | CXXBasePaths &Paths) { | |||
2812 | if (!getLangOpts().CPlusPlus) | |||
2813 | return false; | |||
2814 | ||||
2815 | CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); | |||
2816 | if (!DerivedRD) | |||
2817 | return false; | |||
2818 | ||||
2819 | CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); | |||
2820 | if (!BaseRD) | |||
2821 | return false; | |||
2822 | ||||
2823 | if (!isCompleteType(Loc, Derived) && !DerivedRD->isBeingDefined()) | |||
2824 | return false; | |||
2825 | ||||
2826 | return DerivedRD->isDerivedFrom(BaseRD, Paths); | |||
2827 | } | |||
2828 | ||||
2829 | static void BuildBasePathArray(const CXXBasePath &Path, | |||
2830 | CXXCastPath &BasePathArray) { | |||
2831 | // We first go backward and check if we have a virtual base. | |||
2832 | // FIXME: It would be better if CXXBasePath had the base specifier for | |||
2833 | // the nearest virtual base. | |||
2834 | unsigned Start = 0; | |||
2835 | for (unsigned I = Path.size(); I != 0; --I) { | |||
2836 | if (Path[I - 1].Base->isVirtual()) { | |||
2837 | Start = I - 1; | |||
2838 | break; | |||
2839 | } | |||
2840 | } | |||
2841 | ||||
2842 | // Now add all bases. | |||
2843 | for (unsigned I = Start, E = Path.size(); I != E; ++I) | |||
2844 | BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); | |||
2845 | } | |||
2846 | ||||
2847 | ||||
2848 | void Sema::BuildBasePathArray(const CXXBasePaths &Paths, | |||
2849 | CXXCastPath &BasePathArray) { | |||
2850 | assert(BasePathArray.empty() && "Base path array must be empty!")((BasePathArray.empty() && "Base path array must be empty!" ) ? static_cast<void> (0) : __assert_fail ("BasePathArray.empty() && \"Base path array must be empty!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 2850, __PRETTY_FUNCTION__)); | |||
2851 | assert(Paths.isRecordingPaths() && "Must record paths!")((Paths.isRecordingPaths() && "Must record paths!") ? static_cast<void> (0) : __assert_fail ("Paths.isRecordingPaths() && \"Must record paths!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 2851, __PRETTY_FUNCTION__)); | |||
2852 | return ::BuildBasePathArray(Paths.front(), BasePathArray); | |||
2853 | } | |||
2854 | /// CheckDerivedToBaseConversion - Check whether the Derived-to-Base | |||
2855 | /// conversion (where Derived and Base are class types) is | |||
2856 | /// well-formed, meaning that the conversion is unambiguous (and | |||
2857 | /// that all of the base classes are accessible). Returns true | |||
2858 | /// and emits a diagnostic if the code is ill-formed, returns false | |||
2859 | /// otherwise. Loc is the location where this routine should point to | |||
2860 | /// if there is an error, and Range is the source range to highlight | |||
2861 | /// if there is an error. | |||
2862 | /// | |||
2863 | /// If either InaccessibleBaseID or AmbiguousBaseConvID are 0, then the | |||
2864 | /// diagnostic for the respective type of error will be suppressed, but the | |||
2865 | /// check for ill-formed code will still be performed. | |||
2866 | bool | |||
2867 | Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, | |||
2868 | unsigned InaccessibleBaseID, | |||
2869 | unsigned AmbiguousBaseConvID, | |||
2870 | SourceLocation Loc, SourceRange Range, | |||
2871 | DeclarationName Name, | |||
2872 | CXXCastPath *BasePath, | |||
2873 | bool IgnoreAccess) { | |||
2874 | // First, determine whether the path from Derived to Base is | |||
2875 | // ambiguous. This is slightly more expensive than checking whether | |||
2876 | // the Derived to Base conversion exists, because here we need to | |||
2877 | // explore multiple paths to determine if there is an ambiguity. | |||
2878 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, | |||
2879 | /*DetectVirtual=*/false); | |||
2880 | bool DerivationOkay = IsDerivedFrom(Loc, Derived, Base, Paths); | |||
2881 | if (!DerivationOkay) | |||
2882 | return true; | |||
2883 | ||||
2884 | const CXXBasePath *Path = nullptr; | |||
2885 | if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) | |||
2886 | Path = &Paths.front(); | |||
2887 | ||||
2888 | // For MSVC compatibility, check if Derived directly inherits from Base. Clang | |||
2889 | // warns about this hierarchy under -Winaccessible-base, but MSVC allows the | |||
2890 | // user to access such bases. | |||
2891 | if (!Path && getLangOpts().MSVCCompat) { | |||
2892 | for (const CXXBasePath &PossiblePath : Paths) { | |||
2893 | if (PossiblePath.size() == 1) { | |||
2894 | Path = &PossiblePath; | |||
2895 | if (AmbiguousBaseConvID) | |||
2896 | Diag(Loc, diag::ext_ms_ambiguous_direct_base) | |||
2897 | << Base << Derived << Range; | |||
2898 | break; | |||
2899 | } | |||
2900 | } | |||
2901 | } | |||
2902 | ||||
2903 | if (Path) { | |||
2904 | if (!IgnoreAccess) { | |||
2905 | // Check that the base class can be accessed. | |||
2906 | switch ( | |||
2907 | CheckBaseClassAccess(Loc, Base, Derived, *Path, InaccessibleBaseID)) { | |||
2908 | case AR_inaccessible: | |||
2909 | return true; | |||
2910 | case AR_accessible: | |||
2911 | case AR_dependent: | |||
2912 | case AR_delayed: | |||
2913 | break; | |||
2914 | } | |||
2915 | } | |||
2916 | ||||
2917 | // Build a base path if necessary. | |||
2918 | if (BasePath) | |||
2919 | ::BuildBasePathArray(*Path, *BasePath); | |||
2920 | return false; | |||
2921 | } | |||
2922 | ||||
2923 | if (AmbiguousBaseConvID) { | |||
2924 | // We know that the derived-to-base conversion is ambiguous, and | |||
2925 | // we're going to produce a diagnostic. Perform the derived-to-base | |||
2926 | // search just one more time to compute all of the possible paths so | |||
2927 | // that we can print them out. This is more expensive than any of | |||
2928 | // the previous derived-to-base checks we've done, but at this point | |||
2929 | // performance isn't as much of an issue. | |||
2930 | Paths.clear(); | |||
2931 | Paths.setRecordingPaths(true); | |||
2932 | bool StillOkay = IsDerivedFrom(Loc, Derived, Base, Paths); | |||
2933 | assert(StillOkay && "Can only be used with a derived-to-base conversion")((StillOkay && "Can only be used with a derived-to-base conversion" ) ? static_cast<void> (0) : __assert_fail ("StillOkay && \"Can only be used with a derived-to-base conversion\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 2933, __PRETTY_FUNCTION__)); | |||
2934 | (void)StillOkay; | |||
2935 | ||||
2936 | // Build up a textual representation of the ambiguous paths, e.g., | |||
2937 | // D -> B -> A, that will be used to illustrate the ambiguous | |||
2938 | // conversions in the diagnostic. We only print one of the paths | |||
2939 | // to each base class subobject. | |||
2940 | std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); | |||
2941 | ||||
2942 | Diag(Loc, AmbiguousBaseConvID) | |||
2943 | << Derived << Base << PathDisplayStr << Range << Name; | |||
2944 | } | |||
2945 | return true; | |||
2946 | } | |||
2947 | ||||
2948 | bool | |||
2949 | Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, | |||
2950 | SourceLocation Loc, SourceRange Range, | |||
2951 | CXXCastPath *BasePath, | |||
2952 | bool IgnoreAccess) { | |||
2953 | return CheckDerivedToBaseConversion( | |||
2954 | Derived, Base, diag::err_upcast_to_inaccessible_base, | |||
2955 | diag::err_ambiguous_derived_to_base_conv, Loc, Range, DeclarationName(), | |||
2956 | BasePath, IgnoreAccess); | |||
2957 | } | |||
2958 | ||||
2959 | ||||
2960 | /// Builds a string representing ambiguous paths from a | |||
2961 | /// specific derived class to different subobjects of the same base | |||
2962 | /// class. | |||
2963 | /// | |||
2964 | /// This function builds a string that can be used in error messages | |||
2965 | /// to show the different paths that one can take through the | |||
2966 | /// inheritance hierarchy to go from the derived class to different | |||
2967 | /// subobjects of a base class. The result looks something like this: | |||
2968 | /// @code | |||
2969 | /// struct D -> struct B -> struct A | |||
2970 | /// struct D -> struct C -> struct A | |||
2971 | /// @endcode | |||
2972 | std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { | |||
2973 | std::string PathDisplayStr; | |||
2974 | std::set<unsigned> DisplayedPaths; | |||
2975 | for (CXXBasePaths::paths_iterator Path = Paths.begin(); | |||
2976 | Path != Paths.end(); ++Path) { | |||
2977 | if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { | |||
2978 | // We haven't displayed a path to this particular base | |||
2979 | // class subobject yet. | |||
2980 | PathDisplayStr += "\n "; | |||
2981 | PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); | |||
2982 | for (CXXBasePath::const_iterator Element = Path->begin(); | |||
2983 | Element != Path->end(); ++Element) | |||
2984 | PathDisplayStr += " -> " + Element->Base->getType().getAsString(); | |||
2985 | } | |||
2986 | } | |||
2987 | ||||
2988 | return PathDisplayStr; | |||
2989 | } | |||
2990 | ||||
2991 | //===----------------------------------------------------------------------===// | |||
2992 | // C++ class member Handling | |||
2993 | //===----------------------------------------------------------------------===// | |||
2994 | ||||
2995 | /// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. | |||
2996 | bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, SourceLocation ASLoc, | |||
2997 | SourceLocation ColonLoc, | |||
2998 | const ParsedAttributesView &Attrs) { | |||
2999 | assert(Access != AS_none && "Invalid kind for syntactic access specifier!")((Access != AS_none && "Invalid kind for syntactic access specifier!" ) ? static_cast<void> (0) : __assert_fail ("Access != AS_none && \"Invalid kind for syntactic access specifier!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 2999, __PRETTY_FUNCTION__)); | |||
3000 | AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, | |||
3001 | ASLoc, ColonLoc); | |||
3002 | CurContext->addHiddenDecl(ASDecl); | |||
3003 | return ProcessAccessDeclAttributeList(ASDecl, Attrs); | |||
3004 | } | |||
3005 | ||||
3006 | /// CheckOverrideControl - Check C++11 override control semantics. | |||
3007 | void Sema::CheckOverrideControl(NamedDecl *D) { | |||
3008 | if (D->isInvalidDecl()) | |||
3009 | return; | |||
3010 | ||||
3011 | // We only care about "override" and "final" declarations. | |||
3012 | if (!D->hasAttr<OverrideAttr>() && !D->hasAttr<FinalAttr>()) | |||
3013 | return; | |||
3014 | ||||
3015 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); | |||
3016 | ||||
3017 | // We can't check dependent instance methods. | |||
3018 | if (MD && MD->isInstance() && | |||
3019 | (MD->getParent()->hasAnyDependentBases() || | |||
3020 | MD->getType()->isDependentType())) | |||
3021 | return; | |||
3022 | ||||
3023 | if (MD && !MD->isVirtual()) { | |||
3024 | // If we have a non-virtual method, check if if hides a virtual method. | |||
3025 | // (In that case, it's most likely the method has the wrong type.) | |||
3026 | SmallVector<CXXMethodDecl *, 8> OverloadedMethods; | |||
3027 | FindHiddenVirtualMethods(MD, OverloadedMethods); | |||
3028 | ||||
3029 | if (!OverloadedMethods.empty()) { | |||
3030 | if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { | |||
3031 | Diag(OA->getLocation(), | |||
3032 | diag::override_keyword_hides_virtual_member_function) | |||
3033 | << "override" << (OverloadedMethods.size() > 1); | |||
3034 | } else if (FinalAttr *FA = D->getAttr<FinalAttr>()) { | |||
3035 | Diag(FA->getLocation(), | |||
3036 | diag::override_keyword_hides_virtual_member_function) | |||
3037 | << (FA->isSpelledAsSealed() ? "sealed" : "final") | |||
3038 | << (OverloadedMethods.size() > 1); | |||
3039 | } | |||
3040 | NoteHiddenVirtualMethods(MD, OverloadedMethods); | |||
3041 | MD->setInvalidDecl(); | |||
3042 | return; | |||
3043 | } | |||
3044 | // Fall through into the general case diagnostic. | |||
3045 | // FIXME: We might want to attempt typo correction here. | |||
3046 | } | |||
3047 | ||||
3048 | if (!MD || !MD->isVirtual()) { | |||
3049 | if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { | |||
3050 | Diag(OA->getLocation(), | |||
3051 | diag::override_keyword_only_allowed_on_virtual_member_functions) | |||
3052 | << "override" << FixItHint::CreateRemoval(OA->getLocation()); | |||
3053 | D->dropAttr<OverrideAttr>(); | |||
3054 | } | |||
3055 | if (FinalAttr *FA = D->getAttr<FinalAttr>()) { | |||
3056 | Diag(FA->getLocation(), | |||
3057 | diag::override_keyword_only_allowed_on_virtual_member_functions) | |||
3058 | << (FA->isSpelledAsSealed() ? "sealed" : "final") | |||
3059 | << FixItHint::CreateRemoval(FA->getLocation()); | |||
3060 | D->dropAttr<FinalAttr>(); | |||
3061 | } | |||
3062 | return; | |||
3063 | } | |||
3064 | ||||
3065 | // C++11 [class.virtual]p5: | |||
3066 | // If a function is marked with the virt-specifier override and | |||
3067 | // does not override a member function of a base class, the program is | |||
3068 | // ill-formed. | |||
3069 | bool HasOverriddenMethods = MD->size_overridden_methods() != 0; | |||
3070 | if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) | |||
3071 | Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) | |||
3072 | << MD->getDeclName(); | |||
3073 | } | |||
3074 | ||||
3075 | void Sema::DiagnoseAbsenceOfOverrideControl(NamedDecl *D, bool Inconsistent) { | |||
3076 | if (D->isInvalidDecl() || D->hasAttr<OverrideAttr>()) | |||
3077 | return; | |||
3078 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); | |||
3079 | if (!MD || MD->isImplicit() || MD->hasAttr<FinalAttr>()) | |||
3080 | return; | |||
3081 | ||||
3082 | SourceLocation Loc = MD->getLocation(); | |||
3083 | SourceLocation SpellingLoc = Loc; | |||
3084 | if (getSourceManager().isMacroArgExpansion(Loc)) | |||
3085 | SpellingLoc = getSourceManager().getImmediateExpansionRange(Loc).getBegin(); | |||
3086 | SpellingLoc = getSourceManager().getSpellingLoc(SpellingLoc); | |||
3087 | if (SpellingLoc.isValid() && getSourceManager().isInSystemHeader(SpellingLoc)) | |||
3088 | return; | |||
3089 | ||||
3090 | if (MD->size_overridden_methods() > 0) { | |||
3091 | auto EmitDiag = [&](unsigned DiagInconsistent, unsigned DiagSuggest) { | |||
3092 | unsigned DiagID = | |||
3093 | Inconsistent && !Diags.isIgnored(DiagInconsistent, MD->getLocation()) | |||
3094 | ? DiagInconsistent | |||
3095 | : DiagSuggest; | |||
3096 | Diag(MD->getLocation(), DiagID) << MD->getDeclName(); | |||
3097 | const CXXMethodDecl *OMD = *MD->begin_overridden_methods(); | |||
3098 | Diag(OMD->getLocation(), diag::note_overridden_virtual_function); | |||
3099 | }; | |||
3100 | if (isa<CXXDestructorDecl>(MD)) | |||
3101 | EmitDiag( | |||
3102 | diag::warn_inconsistent_destructor_marked_not_override_overriding, | |||
3103 | diag::warn_suggest_destructor_marked_not_override_overriding); | |||
3104 | else | |||
3105 | EmitDiag(diag::warn_inconsistent_function_marked_not_override_overriding, | |||
3106 | diag::warn_suggest_function_marked_not_override_overriding); | |||
3107 | } | |||
3108 | } | |||
3109 | ||||
3110 | /// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member | |||
3111 | /// function overrides a virtual member function marked 'final', according to | |||
3112 | /// C++11 [class.virtual]p4. | |||
3113 | bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, | |||
3114 | const CXXMethodDecl *Old) { | |||
3115 | FinalAttr *FA = Old->getAttr<FinalAttr>(); | |||
3116 | if (!FA) | |||
3117 | return false; | |||
3118 | ||||
3119 | Diag(New->getLocation(), diag::err_final_function_overridden) | |||
3120 | << New->getDeclName() | |||
3121 | << FA->isSpelledAsSealed(); | |||
3122 | Diag(Old->getLocation(), diag::note_overridden_virtual_function); | |||
3123 | return true; | |||
3124 | } | |||
3125 | ||||
3126 | static bool InitializationHasSideEffects(const FieldDecl &FD) { | |||
3127 | const Type *T = FD.getType()->getBaseElementTypeUnsafe(); | |||
3128 | // FIXME: Destruction of ObjC lifetime types has side-effects. | |||
3129 | if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) | |||
3130 | return !RD->isCompleteDefinition() || | |||
3131 | !RD->hasTrivialDefaultConstructor() || | |||
3132 | !RD->hasTrivialDestructor(); | |||
3133 | return false; | |||
3134 | } | |||
3135 | ||||
3136 | static const ParsedAttr *getMSPropertyAttr(const ParsedAttributesView &list) { | |||
3137 | ParsedAttributesView::const_iterator Itr = | |||
3138 | llvm::find_if(list, [](const ParsedAttr &AL) { | |||
3139 | return AL.isDeclspecPropertyAttribute(); | |||
3140 | }); | |||
3141 | if (Itr != list.end()) | |||
3142 | return &*Itr; | |||
3143 | return nullptr; | |||
3144 | } | |||
3145 | ||||
3146 | // Check if there is a field shadowing. | |||
3147 | void Sema::CheckShadowInheritedFields(const SourceLocation &Loc, | |||
3148 | DeclarationName FieldName, | |||
3149 | const CXXRecordDecl *RD, | |||
3150 | bool DeclIsField) { | |||
3151 | if (Diags.isIgnored(diag::warn_shadow_field, Loc)) | |||
3152 | return; | |||
3153 | ||||
3154 | // To record a shadowed field in a base | |||
3155 | std::map<CXXRecordDecl*, NamedDecl*> Bases; | |||
3156 | auto FieldShadowed = [&](const CXXBaseSpecifier *Specifier, | |||
3157 | CXXBasePath &Path) { | |||
3158 | const auto Base = Specifier->getType()->getAsCXXRecordDecl(); | |||
3159 | // Record an ambiguous path directly | |||
3160 | if (Bases.find(Base) != Bases.end()) | |||
3161 | return true; | |||
3162 | for (const auto Field : Base->lookup(FieldName)) { | |||
3163 | if ((isa<FieldDecl>(Field) || isa<IndirectFieldDecl>(Field)) && | |||
3164 | Field->getAccess() != AS_private) { | |||
3165 | assert(Field->getAccess() != AS_none)((Field->getAccess() != AS_none) ? static_cast<void> (0) : __assert_fail ("Field->getAccess() != AS_none", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 3165, __PRETTY_FUNCTION__)); | |||
3166 | assert(Bases.find(Base) == Bases.end())((Bases.find(Base) == Bases.end()) ? static_cast<void> ( 0) : __assert_fail ("Bases.find(Base) == Bases.end()", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 3166, __PRETTY_FUNCTION__)); | |||
3167 | Bases[Base] = Field; | |||
3168 | return true; | |||
3169 | } | |||
3170 | } | |||
3171 | return false; | |||
3172 | }; | |||
3173 | ||||
3174 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, | |||
3175 | /*DetectVirtual=*/true); | |||
3176 | if (!RD->lookupInBases(FieldShadowed, Paths)) | |||
3177 | return; | |||
3178 | ||||
3179 | for (const auto &P : Paths) { | |||
3180 | auto Base = P.back().Base->getType()->getAsCXXRecordDecl(); | |||
3181 | auto It = Bases.find(Base); | |||
3182 | // Skip duplicated bases | |||
3183 | if (It == Bases.end()) | |||
3184 | continue; | |||
3185 | auto BaseField = It->second; | |||
3186 | assert(BaseField->getAccess() != AS_private)((BaseField->getAccess() != AS_private) ? static_cast<void > (0) : __assert_fail ("BaseField->getAccess() != AS_private" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 3186, __PRETTY_FUNCTION__)); | |||
3187 | if (AS_none != | |||
3188 | CXXRecordDecl::MergeAccess(P.Access, BaseField->getAccess())) { | |||
3189 | Diag(Loc, diag::warn_shadow_field) | |||
3190 | << FieldName << RD << Base << DeclIsField; | |||
3191 | Diag(BaseField->getLocation(), diag::note_shadow_field); | |||
3192 | Bases.erase(It); | |||
3193 | } | |||
3194 | } | |||
3195 | } | |||
3196 | ||||
3197 | /// ActOnCXXMemberDeclarator - This is invoked when a C++ class member | |||
3198 | /// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the | |||
3199 | /// bitfield width if there is one, 'InitExpr' specifies the initializer if | |||
3200 | /// one has been parsed, and 'InitStyle' is set if an in-class initializer is | |||
3201 | /// present (but parsing it has been deferred). | |||
3202 | NamedDecl * | |||
3203 | Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, | |||
3204 | MultiTemplateParamsArg TemplateParameterLists, | |||
3205 | Expr *BW, const VirtSpecifiers &VS, | |||
3206 | InClassInitStyle InitStyle) { | |||
3207 | const DeclSpec &DS = D.getDeclSpec(); | |||
3208 | DeclarationNameInfo NameInfo = GetNameForDeclarator(D); | |||
3209 | DeclarationName Name = NameInfo.getName(); | |||
3210 | SourceLocation Loc = NameInfo.getLoc(); | |||
3211 | ||||
3212 | // For anonymous bitfields, the location should point to the type. | |||
3213 | if (Loc.isInvalid()) | |||
3214 | Loc = D.getBeginLoc(); | |||
3215 | ||||
3216 | Expr *BitWidth = static_cast<Expr*>(BW); | |||
3217 | ||||
3218 | assert(isa<CXXRecordDecl>(CurContext))((isa<CXXRecordDecl>(CurContext)) ? static_cast<void > (0) : __assert_fail ("isa<CXXRecordDecl>(CurContext)" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 3218, __PRETTY_FUNCTION__)); | |||
3219 | assert(!DS.isFriendSpecified())((!DS.isFriendSpecified()) ? static_cast<void> (0) : __assert_fail ("!DS.isFriendSpecified()", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 3219, __PRETTY_FUNCTION__)); | |||
3220 | ||||
3221 | bool isFunc = D.isDeclarationOfFunction(); | |||
3222 | const ParsedAttr *MSPropertyAttr = | |||
3223 | getMSPropertyAttr(D.getDeclSpec().getAttributes()); | |||
3224 | ||||
3225 | if (cast<CXXRecordDecl>(CurContext)->isInterface()) { | |||
3226 | // The Microsoft extension __interface only permits public member functions | |||
3227 | // and prohibits constructors, destructors, operators, non-public member | |||
3228 | // functions, static methods and data members. | |||
3229 | unsigned InvalidDecl; | |||
3230 | bool ShowDeclName = true; | |||
3231 | if (!isFunc && | |||
3232 | (DS.getStorageClassSpec() == DeclSpec::SCS_typedef || MSPropertyAttr)) | |||
3233 | InvalidDecl = 0; | |||
3234 | else if (!isFunc) | |||
3235 | InvalidDecl = 1; | |||
3236 | else if (AS != AS_public) | |||
3237 | InvalidDecl = 2; | |||
3238 | else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) | |||
3239 | InvalidDecl = 3; | |||
3240 | else switch (Name.getNameKind()) { | |||
3241 | case DeclarationName::CXXConstructorName: | |||
3242 | InvalidDecl = 4; | |||
3243 | ShowDeclName = false; | |||
3244 | break; | |||
3245 | ||||
3246 | case DeclarationName::CXXDestructorName: | |||
3247 | InvalidDecl = 5; | |||
3248 | ShowDeclName = false; | |||
3249 | break; | |||
3250 | ||||
3251 | case DeclarationName::CXXOperatorName: | |||
3252 | case DeclarationName::CXXConversionFunctionName: | |||
3253 | InvalidDecl = 6; | |||
3254 | break; | |||
3255 | ||||
3256 | default: | |||
3257 | InvalidDecl = 0; | |||
3258 | break; | |||
3259 | } | |||
3260 | ||||
3261 | if (InvalidDecl) { | |||
3262 | if (ShowDeclName) | |||
3263 | Diag(Loc, diag::err_invalid_member_in_interface) | |||
3264 | << (InvalidDecl-1) << Name; | |||
3265 | else | |||
3266 | Diag(Loc, diag::err_invalid_member_in_interface) | |||
3267 | << (InvalidDecl-1) << ""; | |||
3268 | return nullptr; | |||
3269 | } | |||
3270 | } | |||
3271 | ||||
3272 | // C++ 9.2p6: A member shall not be declared to have automatic storage | |||
3273 | // duration (auto, register) or with the extern storage-class-specifier. | |||
3274 | // C++ 7.1.1p8: The mutable specifier can be applied only to names of class | |||
3275 | // data members and cannot be applied to names declared const or static, | |||
3276 | // and cannot be applied to reference members. | |||
3277 | switch (DS.getStorageClassSpec()) { | |||
3278 | case DeclSpec::SCS_unspecified: | |||
3279 | case DeclSpec::SCS_typedef: | |||
3280 | case DeclSpec::SCS_static: | |||
3281 | break; | |||
3282 | case DeclSpec::SCS_mutable: | |||
3283 | if (isFunc) { | |||
3284 | Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); | |||
3285 | ||||
3286 | // FIXME: It would be nicer if the keyword was ignored only for this | |||
3287 | // declarator. Otherwise we could get follow-up errors. | |||
3288 | D.getMutableDeclSpec().ClearStorageClassSpecs(); | |||
3289 | } | |||
3290 | break; | |||
3291 | default: | |||
3292 | Diag(DS.getStorageClassSpecLoc(), | |||
3293 | diag::err_storageclass_invalid_for_member); | |||
3294 | D.getMutableDeclSpec().ClearStorageClassSpecs(); | |||
3295 | break; | |||
3296 | } | |||
3297 | ||||
3298 | bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || | |||
3299 | DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && | |||
3300 | !isFunc); | |||
3301 | ||||
3302 | if (DS.hasConstexprSpecifier() && isInstField) { | |||
3303 | SemaDiagnosticBuilder B = | |||
3304 | Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member); | |||
3305 | SourceLocation ConstexprLoc = DS.getConstexprSpecLoc(); | |||
3306 | if (InitStyle == ICIS_NoInit) { | |||
3307 | B << 0 << 0; | |||
3308 | if (D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) | |||
3309 | B << FixItHint::CreateRemoval(ConstexprLoc); | |||
3310 | else { | |||
3311 | B << FixItHint::CreateReplacement(ConstexprLoc, "const"); | |||
3312 | D.getMutableDeclSpec().ClearConstexprSpec(); | |||
3313 | const char *PrevSpec; | |||
3314 | unsigned DiagID; | |||
3315 | bool Failed = D.getMutableDeclSpec().SetTypeQual( | |||
3316 | DeclSpec::TQ_const, ConstexprLoc, PrevSpec, DiagID, getLangOpts()); | |||
3317 | (void)Failed; | |||
3318 | assert(!Failed && "Making a constexpr member const shouldn't fail")((!Failed && "Making a constexpr member const shouldn't fail" ) ? static_cast<void> (0) : __assert_fail ("!Failed && \"Making a constexpr member const shouldn't fail\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 3318, __PRETTY_FUNCTION__)); | |||
3319 | } | |||
3320 | } else { | |||
3321 | B << 1; | |||
3322 | const char *PrevSpec; | |||
3323 | unsigned DiagID; | |||
3324 | if (D.getMutableDeclSpec().SetStorageClassSpec( | |||
3325 | *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID, | |||
3326 | Context.getPrintingPolicy())) { | |||
3327 | assert(DS.getStorageClassSpec() == DeclSpec::SCS_mutable &&((DS.getStorageClassSpec() == DeclSpec::SCS_mutable && "This is the only DeclSpec that should fail to be applied") ? static_cast<void> (0) : __assert_fail ("DS.getStorageClassSpec() == DeclSpec::SCS_mutable && \"This is the only DeclSpec that should fail to be applied\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 3328, __PRETTY_FUNCTION__)) | |||
3328 | "This is the only DeclSpec that should fail to be applied")((DS.getStorageClassSpec() == DeclSpec::SCS_mutable && "This is the only DeclSpec that should fail to be applied") ? static_cast<void> (0) : __assert_fail ("DS.getStorageClassSpec() == DeclSpec::SCS_mutable && \"This is the only DeclSpec that should fail to be applied\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 3328, __PRETTY_FUNCTION__)); | |||
3329 | B << 1; | |||
3330 | } else { | |||
3331 | B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static "); | |||
3332 | isInstField = false; | |||
3333 | } | |||
3334 | } | |||
3335 | } | |||
3336 | ||||
3337 | NamedDecl *Member; | |||
3338 | if (isInstField) { | |||
3339 | CXXScopeSpec &SS = D.getCXXScopeSpec(); | |||
3340 | ||||
3341 | // Data members must have identifiers for names. | |||
3342 | if (!Name.isIdentifier()) { | |||
3343 | Diag(Loc, diag::err_bad_variable_name) | |||
3344 | << Name; | |||
3345 | return nullptr; | |||
3346 | } | |||
3347 | ||||
3348 | IdentifierInfo *II = Name.getAsIdentifierInfo(); | |||
3349 | ||||
3350 | // Member field could not be with "template" keyword. | |||
3351 | // So TemplateParameterLists should be empty in this case. | |||
3352 | if (TemplateParameterLists.size()) { | |||
3353 | TemplateParameterList* TemplateParams = TemplateParameterLists[0]; | |||
3354 | if (TemplateParams->size()) { | |||
3355 | // There is no such thing as a member field template. | |||
3356 | Diag(D.getIdentifierLoc(), diag::err_template_member) | |||
3357 | << II | |||
3358 | << SourceRange(TemplateParams->getTemplateLoc(), | |||
3359 | TemplateParams->getRAngleLoc()); | |||
3360 | } else { | |||
3361 | // There is an extraneous 'template<>' for this member. | |||
3362 | Diag(TemplateParams->getTemplateLoc(), | |||
3363 | diag::err_template_member_noparams) | |||
3364 | << II | |||
3365 | << SourceRange(TemplateParams->getTemplateLoc(), | |||
3366 | TemplateParams->getRAngleLoc()); | |||
3367 | } | |||
3368 | return nullptr; | |||
3369 | } | |||
3370 | ||||
3371 | if (SS.isSet() && !SS.isInvalid()) { | |||
3372 | // The user provided a superfluous scope specifier inside a class | |||
3373 | // definition: | |||
3374 | // | |||
3375 | // class X { | |||
3376 | // int X::member; | |||
3377 | // }; | |||
3378 | if (DeclContext *DC = computeDeclContext(SS, false)) | |||
3379 | diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc(), | |||
3380 | D.getName().getKind() == | |||
3381 | UnqualifiedIdKind::IK_TemplateId); | |||
3382 | else | |||
3383 | Diag(D.getIdentifierLoc(), diag::err_member_qualification) | |||
3384 | << Name << SS.getRange(); | |||
3385 | ||||
3386 | SS.clear(); | |||
3387 | } | |||
3388 | ||||
3389 | if (MSPropertyAttr) { | |||
3390 | Member = HandleMSProperty(S, cast<CXXRecordDecl>(CurContext), Loc, D, | |||
3391 | BitWidth, InitStyle, AS, *MSPropertyAttr); | |||
3392 | if (!Member) | |||
3393 | return nullptr; | |||
3394 | isInstField = false; | |||
3395 | } else { | |||
3396 | Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, | |||
3397 | BitWidth, InitStyle, AS); | |||
3398 | if (!Member) | |||
3399 | return nullptr; | |||
3400 | } | |||
3401 | ||||
3402 | CheckShadowInheritedFields(Loc, Name, cast<CXXRecordDecl>(CurContext)); | |||
3403 | } else { | |||
3404 | Member = HandleDeclarator(S, D, TemplateParameterLists); | |||
3405 | if (!Member) | |||
3406 | return nullptr; | |||
3407 | ||||
3408 | // Non-instance-fields can't have a bitfield. | |||
3409 | if (BitWidth) { | |||
3410 | if (Member->isInvalidDecl()) { | |||
3411 | // don't emit another diagnostic. | |||
3412 | } else if (isa<VarDecl>(Member) || isa<VarTemplateDecl>(Member)) { | |||
3413 | // C++ 9.6p3: A bit-field shall not be a static member. | |||
3414 | // "static member 'A' cannot be a bit-field" | |||
3415 | Diag(Loc, diag::err_static_not_bitfield) | |||
3416 | << Name << BitWidth->getSourceRange(); | |||
3417 | } else if (isa<TypedefDecl>(Member)) { | |||
3418 | // "typedef member 'x' cannot be a bit-field" | |||
3419 | Diag(Loc, diag::err_typedef_not_bitfield) | |||
3420 | << Name << BitWidth->getSourceRange(); | |||
3421 | } else { | |||
3422 | // A function typedef ("typedef int f(); f a;"). | |||
3423 | // C++ 9.6p3: A bit-field shall have integral or enumeration type. | |||
3424 | Diag(Loc, diag::err_not_integral_type_bitfield) | |||
3425 | << Name << cast<ValueDecl>(Member)->getType() | |||
3426 | << BitWidth->getSourceRange(); | |||
3427 | } | |||
3428 | ||||
3429 | BitWidth = nullptr; | |||
3430 | Member->setInvalidDecl(); | |||
3431 | } | |||
3432 | ||||
3433 | NamedDecl *NonTemplateMember = Member; | |||
3434 | if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) | |||
3435 | NonTemplateMember = FunTmpl->getTemplatedDecl(); | |||
3436 | else if (VarTemplateDecl *VarTmpl = dyn_cast<VarTemplateDecl>(Member)) | |||
3437 | NonTemplateMember = VarTmpl->getTemplatedDecl(); | |||
3438 | ||||
3439 | Member->setAccess(AS); | |||
3440 | ||||
3441 | // If we have declared a member function template or static data member | |||
3442 | // template, set the access of the templated declaration as well. | |||
3443 | if (NonTemplateMember != Member) | |||
3444 | NonTemplateMember->setAccess(AS); | |||
3445 | ||||
3446 | // C++ [temp.deduct.guide]p3: | |||
3447 | // A deduction guide [...] for a member class template [shall be | |||
3448 | // declared] with the same access [as the template]. | |||
3449 | if (auto *DG = dyn_cast<CXXDeductionGuideDecl>(NonTemplateMember)) { | |||
3450 | auto *TD = DG->getDeducedTemplate(); | |||
3451 | // Access specifiers are only meaningful if both the template and the | |||
3452 | // deduction guide are from the same scope. | |||
3453 | if (AS != TD->getAccess() && | |||
3454 | TD->getDeclContext()->getRedeclContext()->Equals( | |||
3455 | DG->getDeclContext()->getRedeclContext())) { | |||
3456 | Diag(DG->getBeginLoc(), diag::err_deduction_guide_wrong_access); | |||
3457 | Diag(TD->getBeginLoc(), diag::note_deduction_guide_template_access) | |||
3458 | << TD->getAccess(); | |||
3459 | const AccessSpecDecl *LastAccessSpec = nullptr; | |||
3460 | for (const auto *D : cast<CXXRecordDecl>(CurContext)->decls()) { | |||
3461 | if (const auto *AccessSpec = dyn_cast<AccessSpecDecl>(D)) | |||
3462 | LastAccessSpec = AccessSpec; | |||
3463 | } | |||
3464 | assert(LastAccessSpec && "differing access with no access specifier")((LastAccessSpec && "differing access with no access specifier" ) ? static_cast<void> (0) : __assert_fail ("LastAccessSpec && \"differing access with no access specifier\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 3464, __PRETTY_FUNCTION__)); | |||
3465 | Diag(LastAccessSpec->getBeginLoc(), diag::note_deduction_guide_access) | |||
3466 | << AS; | |||
3467 | } | |||
3468 | } | |||
3469 | } | |||
3470 | ||||
3471 | if (VS.isOverrideSpecified()) | |||
3472 | Member->addAttr(OverrideAttr::Create(Context, VS.getOverrideLoc(), | |||
3473 | AttributeCommonInfo::AS_Keyword)); | |||
3474 | if (VS.isFinalSpecified()) | |||
3475 | Member->addAttr(FinalAttr::Create( | |||
3476 | Context, VS.getFinalLoc(), AttributeCommonInfo::AS_Keyword, | |||
3477 | static_cast<FinalAttr::Spelling>(VS.isFinalSpelledSealed()))); | |||
3478 | ||||
3479 | if (VS.getLastLocation().isValid()) { | |||
3480 | // Update the end location of a method that has a virt-specifiers. | |||
3481 | if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) | |||
3482 | MD->setRangeEnd(VS.getLastLocation()); | |||
3483 | } | |||
3484 | ||||
3485 | CheckOverrideControl(Member); | |||
3486 | ||||
3487 | assert((Name || isInstField) && "No identifier for non-field ?")(((Name || isInstField) && "No identifier for non-field ?" ) ? static_cast<void> (0) : __assert_fail ("(Name || isInstField) && \"No identifier for non-field ?\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 3487, __PRETTY_FUNCTION__)); | |||
3488 | ||||
3489 | if (isInstField) { | |||
3490 | FieldDecl *FD = cast<FieldDecl>(Member); | |||
3491 | FieldCollector->Add(FD); | |||
3492 | ||||
3493 | if (!Diags.isIgnored(diag::warn_unused_private_field, FD->getLocation())) { | |||
3494 | // Remember all explicit private FieldDecls that have a name, no side | |||
3495 | // effects and are not part of a dependent type declaration. | |||
3496 | if (!FD->isImplicit() && FD->getDeclName() && | |||
3497 | FD->getAccess() == AS_private && | |||
3498 | !FD->hasAttr<UnusedAttr>() && | |||
3499 | !FD->getParent()->isDependentContext() && | |||
3500 | !InitializationHasSideEffects(*FD)) | |||
3501 | UnusedPrivateFields.insert(FD); | |||
3502 | } | |||
3503 | } | |||
3504 | ||||
3505 | return Member; | |||
3506 | } | |||
3507 | ||||
3508 | namespace { | |||
3509 | class UninitializedFieldVisitor | |||
3510 | : public EvaluatedExprVisitor<UninitializedFieldVisitor> { | |||
3511 | Sema &S; | |||
3512 | // List of Decls to generate a warning on. Also remove Decls that become | |||
3513 | // initialized. | |||
3514 | llvm::SmallPtrSetImpl<ValueDecl*> &Decls; | |||
3515 | // List of base classes of the record. Classes are removed after their | |||
3516 | // initializers. | |||
3517 | llvm::SmallPtrSetImpl<QualType> &BaseClasses; | |||
3518 | // Vector of decls to be removed from the Decl set prior to visiting the | |||
3519 | // nodes. These Decls may have been initialized in the prior initializer. | |||
3520 | llvm::SmallVector<ValueDecl*, 4> DeclsToRemove; | |||
3521 | // If non-null, add a note to the warning pointing back to the constructor. | |||
3522 | const CXXConstructorDecl *Constructor; | |||
3523 | // Variables to hold state when processing an initializer list. When | |||
3524 | // InitList is true, special case initialization of FieldDecls matching | |||
3525 | // InitListFieldDecl. | |||
3526 | bool InitList; | |||
3527 | FieldDecl *InitListFieldDecl; | |||
3528 | llvm::SmallVector<unsigned, 4> InitFieldIndex; | |||
3529 | ||||
3530 | public: | |||
3531 | typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; | |||
3532 | UninitializedFieldVisitor(Sema &S, | |||
3533 | llvm::SmallPtrSetImpl<ValueDecl*> &Decls, | |||
3534 | llvm::SmallPtrSetImpl<QualType> &BaseClasses) | |||
3535 | : Inherited(S.Context), S(S), Decls(Decls), BaseClasses(BaseClasses), | |||
3536 | Constructor(nullptr), InitList(false), InitListFieldDecl(nullptr) {} | |||
3537 | ||||
3538 | // Returns true if the use of ME is not an uninitialized use. | |||
3539 | bool IsInitListMemberExprInitialized(MemberExpr *ME, | |||
3540 | bool CheckReferenceOnly) { | |||
3541 | llvm::SmallVector<FieldDecl*, 4> Fields; | |||
3542 | bool ReferenceField = false; | |||
3543 | while (ME) { | |||
3544 | FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl()); | |||
3545 | if (!FD) | |||
3546 | return false; | |||
3547 | Fields.push_back(FD); | |||
3548 | if (FD->getType()->isReferenceType()) | |||
3549 | ReferenceField = true; | |||
3550 | ME = dyn_cast<MemberExpr>(ME->getBase()->IgnoreParenImpCasts()); | |||
3551 | } | |||
3552 | ||||
3553 | // Binding a reference to an uninitialized field is not an | |||
3554 | // uninitialized use. | |||
3555 | if (CheckReferenceOnly && !ReferenceField) | |||
3556 | return true; | |||
3557 | ||||
3558 | llvm::SmallVector<unsigned, 4> UsedFieldIndex; | |||
3559 | // Discard the first field since it is the field decl that is being | |||
3560 | // initialized. | |||
3561 | for (auto I = Fields.rbegin() + 1, E = Fields.rend(); I != E; ++I) { | |||
3562 | UsedFieldIndex.push_back((*I)->getFieldIndex()); | |||
3563 | } | |||
3564 | ||||
3565 | for (auto UsedIter = UsedFieldIndex.begin(), | |||
3566 | UsedEnd = UsedFieldIndex.end(), | |||
3567 | OrigIter = InitFieldIndex.begin(), | |||
3568 | OrigEnd = InitFieldIndex.end(); | |||
3569 | UsedIter != UsedEnd && OrigIter != OrigEnd; ++UsedIter, ++OrigIter) { | |||
3570 | if (*UsedIter < *OrigIter) | |||
3571 | return true; | |||
3572 | if (*UsedIter > *OrigIter) | |||
3573 | break; | |||
3574 | } | |||
3575 | ||||
3576 | return false; | |||
3577 | } | |||
3578 | ||||
3579 | void HandleMemberExpr(MemberExpr *ME, bool CheckReferenceOnly, | |||
3580 | bool AddressOf) { | |||
3581 | if (isa<EnumConstantDecl>(ME->getMemberDecl())) | |||
3582 | return; | |||
3583 | ||||
3584 | // FieldME is the inner-most MemberExpr that is not an anonymous struct | |||
3585 | // or union. | |||
3586 | MemberExpr *FieldME = ME; | |||
3587 | ||||
3588 | bool AllPODFields = FieldME->getType().isPODType(S.Context); | |||
3589 | ||||
3590 | Expr *Base = ME; | |||
3591 | while (MemberExpr *SubME = | |||
3592 | dyn_cast<MemberExpr>(Base->IgnoreParenImpCasts())) { | |||
3593 | ||||
3594 | if (isa<VarDecl>(SubME->getMemberDecl())) | |||
3595 | return; | |||
3596 | ||||
3597 | if (FieldDecl *FD = dyn_cast<FieldDecl>(SubME->getMemberDecl())) | |||
3598 | if (!FD->isAnonymousStructOrUnion()) | |||
3599 | FieldME = SubME; | |||
3600 | ||||
3601 | if (!FieldME->getType().isPODType(S.Context)) | |||
3602 | AllPODFields = false; | |||
3603 | ||||
3604 | Base = SubME->getBase(); | |||
3605 | } | |||
3606 | ||||
3607 | if (!isa<CXXThisExpr>(Base->IgnoreParenImpCasts())) { | |||
3608 | Visit(Base); | |||
3609 | return; | |||
3610 | } | |||
3611 | ||||
3612 | if (AddressOf && AllPODFields) | |||
3613 | return; | |||
3614 | ||||
3615 | ValueDecl* FoundVD = FieldME->getMemberDecl(); | |||
3616 | ||||
3617 | if (ImplicitCastExpr *BaseCast = dyn_cast<ImplicitCastExpr>(Base)) { | |||
3618 | while (isa<ImplicitCastExpr>(BaseCast->getSubExpr())) { | |||
3619 | BaseCast = cast<ImplicitCastExpr>(BaseCast->getSubExpr()); | |||
3620 | } | |||
3621 | ||||
3622 | if (BaseCast->getCastKind() == CK_UncheckedDerivedToBase) { | |||
3623 | QualType T = BaseCast->getType(); | |||
3624 | if (T->isPointerType() && | |||
3625 | BaseClasses.count(T->getPointeeType())) { | |||
3626 | S.Diag(FieldME->getExprLoc(), diag::warn_base_class_is_uninit) | |||
3627 | << T->getPointeeType() << FoundVD; | |||
3628 | } | |||
3629 | } | |||
3630 | } | |||
3631 | ||||
3632 | if (!Decls.count(FoundVD)) | |||
3633 | return; | |||
3634 | ||||
3635 | const bool IsReference = FoundVD->getType()->isReferenceType(); | |||
3636 | ||||
3637 | if (InitList && !AddressOf && FoundVD == InitListFieldDecl) { | |||
3638 | // Special checking for initializer lists. | |||
3639 | if (IsInitListMemberExprInitialized(ME, CheckReferenceOnly)) { | |||
3640 | return; | |||
3641 | } | |||
3642 | } else { | |||
3643 | // Prevent double warnings on use of unbounded references. | |||
3644 | if (CheckReferenceOnly && !IsReference) | |||
3645 | return; | |||
3646 | } | |||
3647 | ||||
3648 | unsigned diag = IsReference | |||
3649 | ? diag::warn_reference_field_is_uninit | |||
3650 | : diag::warn_field_is_uninit; | |||
3651 | S.Diag(FieldME->getExprLoc(), diag) << FoundVD; | |||
3652 | if (Constructor) | |||
3653 | S.Diag(Constructor->getLocation(), | |||
3654 | diag::note_uninit_in_this_constructor) | |||
3655 | << (Constructor->isDefaultConstructor() && Constructor->isImplicit()); | |||
3656 | ||||
3657 | } | |||
3658 | ||||
3659 | void HandleValue(Expr *E, bool AddressOf) { | |||
3660 | E = E->IgnoreParens(); | |||
3661 | ||||
3662 | if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { | |||
3663 | HandleMemberExpr(ME, false /*CheckReferenceOnly*/, | |||
3664 | AddressOf /*AddressOf*/); | |||
3665 | return; | |||
3666 | } | |||
3667 | ||||
3668 | if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { | |||
3669 | Visit(CO->getCond()); | |||
3670 | HandleValue(CO->getTrueExpr(), AddressOf); | |||
3671 | HandleValue(CO->getFalseExpr(), AddressOf); | |||
3672 | return; | |||
3673 | } | |||
3674 | ||||
3675 | if (BinaryConditionalOperator *BCO = | |||
3676 | dyn_cast<BinaryConditionalOperator>(E)) { | |||
3677 | Visit(BCO->getCond()); | |||
3678 | HandleValue(BCO->getFalseExpr(), AddressOf); | |||
3679 | return; | |||
3680 | } | |||
3681 | ||||
3682 | if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) { | |||
3683 | HandleValue(OVE->getSourceExpr(), AddressOf); | |||
3684 | return; | |||
3685 | } | |||
3686 | ||||
3687 | if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { | |||
3688 | switch (BO->getOpcode()) { | |||
3689 | default: | |||
3690 | break; | |||
3691 | case(BO_PtrMemD): | |||
3692 | case(BO_PtrMemI): | |||
3693 | HandleValue(BO->getLHS(), AddressOf); | |||
3694 | Visit(BO->getRHS()); | |||
3695 | return; | |||
3696 | case(BO_Comma): | |||
3697 | Visit(BO->getLHS()); | |||
3698 | HandleValue(BO->getRHS(), AddressOf); | |||
3699 | return; | |||
3700 | } | |||
3701 | } | |||
3702 | ||||
3703 | Visit(E); | |||
3704 | } | |||
3705 | ||||
3706 | void CheckInitListExpr(InitListExpr *ILE) { | |||
3707 | InitFieldIndex.push_back(0); | |||
3708 | for (auto Child : ILE->children()) { | |||
3709 | if (InitListExpr *SubList = dyn_cast<InitListExpr>(Child)) { | |||
3710 | CheckInitListExpr(SubList); | |||
3711 | } else { | |||
3712 | Visit(Child); | |||
3713 | } | |||
3714 | ++InitFieldIndex.back(); | |||
3715 | } | |||
3716 | InitFieldIndex.pop_back(); | |||
3717 | } | |||
3718 | ||||
3719 | void CheckInitializer(Expr *E, const CXXConstructorDecl *FieldConstructor, | |||
3720 | FieldDecl *Field, const Type *BaseClass) { | |||
3721 | // Remove Decls that may have been initialized in the previous | |||
3722 | // initializer. | |||
3723 | for (ValueDecl* VD : DeclsToRemove) | |||
3724 | Decls.erase(VD); | |||
3725 | DeclsToRemove.clear(); | |||
3726 | ||||
3727 | Constructor = FieldConstructor; | |||
3728 | InitListExpr *ILE = dyn_cast<InitListExpr>(E); | |||
3729 | ||||
3730 | if (ILE && Field) { | |||
3731 | InitList = true; | |||
3732 | InitListFieldDecl = Field; | |||
3733 | InitFieldIndex.clear(); | |||
3734 | CheckInitListExpr(ILE); | |||
3735 | } else { | |||
3736 | InitList = false; | |||
3737 | Visit(E); | |||
3738 | } | |||
3739 | ||||
3740 | if (Field) | |||
3741 | Decls.erase(Field); | |||
3742 | if (BaseClass) | |||
3743 | BaseClasses.erase(BaseClass->getCanonicalTypeInternal()); | |||
3744 | } | |||
3745 | ||||
3746 | void VisitMemberExpr(MemberExpr *ME) { | |||
3747 | // All uses of unbounded reference fields will warn. | |||
3748 | HandleMemberExpr(ME, true /*CheckReferenceOnly*/, false /*AddressOf*/); | |||
3749 | } | |||
3750 | ||||
3751 | void VisitImplicitCastExpr(ImplicitCastExpr *E) { | |||
3752 | if (E->getCastKind() == CK_LValueToRValue) { | |||
3753 | HandleValue(E->getSubExpr(), false /*AddressOf*/); | |||
3754 | return; | |||
3755 | } | |||
3756 | ||||
3757 | Inherited::VisitImplicitCastExpr(E); | |||
3758 | } | |||
3759 | ||||
3760 | void VisitCXXConstructExpr(CXXConstructExpr *E) { | |||
3761 | if (E->getConstructor()->isCopyConstructor()) { | |||
3762 | Expr *ArgExpr = E->getArg(0); | |||
3763 | if (InitListExpr *ILE = dyn_cast<InitListExpr>(ArgExpr)) | |||
3764 | if (ILE->getNumInits() == 1) | |||
3765 | ArgExpr = ILE->getInit(0); | |||
3766 | if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr)) | |||
3767 | if (ICE->getCastKind() == CK_NoOp) | |||
3768 | ArgExpr = ICE->getSubExpr(); | |||
3769 | HandleValue(ArgExpr, false /*AddressOf*/); | |||
3770 | return; | |||
3771 | } | |||
3772 | Inherited::VisitCXXConstructExpr(E); | |||
3773 | } | |||
3774 | ||||
3775 | void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { | |||
3776 | Expr *Callee = E->getCallee(); | |||
3777 | if (isa<MemberExpr>(Callee)) { | |||
3778 | HandleValue(Callee, false /*AddressOf*/); | |||
3779 | for (auto Arg : E->arguments()) | |||
3780 | Visit(Arg); | |||
3781 | return; | |||
3782 | } | |||
3783 | ||||
3784 | Inherited::VisitCXXMemberCallExpr(E); | |||
3785 | } | |||
3786 | ||||
3787 | void VisitCallExpr(CallExpr *E) { | |||
3788 | // Treat std::move as a use. | |||
3789 | if (E->isCallToStdMove()) { | |||
3790 | HandleValue(E->getArg(0), /*AddressOf=*/false); | |||
3791 | return; | |||
3792 | } | |||
3793 | ||||
3794 | Inherited::VisitCallExpr(E); | |||
3795 | } | |||
3796 | ||||
3797 | void VisitCXXOperatorCallExpr(CXXOperatorCallExpr *E) { | |||
3798 | Expr *Callee = E->getCallee(); | |||
3799 | ||||
3800 | if (isa<UnresolvedLookupExpr>(Callee)) | |||
3801 | return Inherited::VisitCXXOperatorCallExpr(E); | |||
3802 | ||||
3803 | Visit(Callee); | |||
3804 | for (auto Arg : E->arguments()) | |||
3805 | HandleValue(Arg->IgnoreParenImpCasts(), false /*AddressOf*/); | |||
3806 | } | |||
3807 | ||||
3808 | void VisitBinaryOperator(BinaryOperator *E) { | |||
3809 | // If a field assignment is detected, remove the field from the | |||
3810 | // uninitiailized field set. | |||
3811 | if (E->getOpcode() == BO_Assign) | |||
3812 | if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getLHS())) | |||
3813 | if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) | |||
3814 | if (!FD->getType()->isReferenceType()) | |||
3815 | DeclsToRemove.push_back(FD); | |||
3816 | ||||
3817 | if (E->isCompoundAssignmentOp()) { | |||
3818 | HandleValue(E->getLHS(), false /*AddressOf*/); | |||
3819 | Visit(E->getRHS()); | |||
3820 | return; | |||
3821 | } | |||
3822 | ||||
3823 | Inherited::VisitBinaryOperator(E); | |||
3824 | } | |||
3825 | ||||
3826 | void VisitUnaryOperator(UnaryOperator *E) { | |||
3827 | if (E->isIncrementDecrementOp()) { | |||
3828 | HandleValue(E->getSubExpr(), false /*AddressOf*/); | |||
3829 | return; | |||
3830 | } | |||
3831 | if (E->getOpcode() == UO_AddrOf) { | |||
3832 | if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getSubExpr())) { | |||
3833 | HandleValue(ME->getBase(), true /*AddressOf*/); | |||
3834 | return; | |||
3835 | } | |||
3836 | } | |||
3837 | ||||
3838 | Inherited::VisitUnaryOperator(E); | |||
3839 | } | |||
3840 | }; | |||
3841 | ||||
3842 | // Diagnose value-uses of fields to initialize themselves, e.g. | |||
3843 | // foo(foo) | |||
3844 | // where foo is not also a parameter to the constructor. | |||
3845 | // Also diagnose across field uninitialized use such as | |||
3846 | // x(y), y(x) | |||
3847 | // TODO: implement -Wuninitialized and fold this into that framework. | |||
3848 | static void DiagnoseUninitializedFields( | |||
3849 | Sema &SemaRef, const CXXConstructorDecl *Constructor) { | |||
3850 | ||||
3851 | if (SemaRef.getDiagnostics().isIgnored(diag::warn_field_is_uninit, | |||
3852 | Constructor->getLocation())) { | |||
3853 | return; | |||
3854 | } | |||
3855 | ||||
3856 | if (Constructor->isInvalidDecl()) | |||
3857 | return; | |||
3858 | ||||
3859 | const CXXRecordDecl *RD = Constructor->getParent(); | |||
3860 | ||||
3861 | if (RD->isDependentContext()) | |||
3862 | return; | |||
3863 | ||||
3864 | // Holds fields that are uninitialized. | |||
3865 | llvm::SmallPtrSet<ValueDecl*, 4> UninitializedFields; | |||
3866 | ||||
3867 | // At the beginning, all fields are uninitialized. | |||
3868 | for (auto *I : RD->decls()) { | |||
3869 | if (auto *FD = dyn_cast<FieldDecl>(I)) { | |||
3870 | UninitializedFields.insert(FD); | |||
3871 | } else if (auto *IFD = dyn_cast<IndirectFieldDecl>(I)) { | |||
3872 | UninitializedFields.insert(IFD->getAnonField()); | |||
3873 | } | |||
3874 | } | |||
3875 | ||||
3876 | llvm::SmallPtrSet<QualType, 4> UninitializedBaseClasses; | |||
3877 | for (auto I : RD->bases()) | |||
3878 | UninitializedBaseClasses.insert(I.getType().getCanonicalType()); | |||
3879 | ||||
3880 | if (UninitializedFields.empty() && UninitializedBaseClasses.empty()) | |||
3881 | return; | |||
3882 | ||||
3883 | UninitializedFieldVisitor UninitializedChecker(SemaRef, | |||
3884 | UninitializedFields, | |||
3885 | UninitializedBaseClasses); | |||
3886 | ||||
3887 | for (const auto *FieldInit : Constructor->inits()) { | |||
3888 | if (UninitializedFields.empty() && UninitializedBaseClasses.empty()) | |||
3889 | break; | |||
3890 | ||||
3891 | Expr *InitExpr = FieldInit->getInit(); | |||
3892 | if (!InitExpr) | |||
3893 | continue; | |||
3894 | ||||
3895 | if (CXXDefaultInitExpr *Default = | |||
3896 | dyn_cast<CXXDefaultInitExpr>(InitExpr)) { | |||
3897 | InitExpr = Default->getExpr(); | |||
3898 | if (!InitExpr) | |||
3899 | continue; | |||
3900 | // In class initializers will point to the constructor. | |||
3901 | UninitializedChecker.CheckInitializer(InitExpr, Constructor, | |||
3902 | FieldInit->getAnyMember(), | |||
3903 | FieldInit->getBaseClass()); | |||
3904 | } else { | |||
3905 | UninitializedChecker.CheckInitializer(InitExpr, nullptr, | |||
3906 | FieldInit->getAnyMember(), | |||
3907 | FieldInit->getBaseClass()); | |||
3908 | } | |||
3909 | } | |||
3910 | } | |||
3911 | } // namespace | |||
3912 | ||||
3913 | /// Enter a new C++ default initializer scope. After calling this, the | |||
3914 | /// caller must call \ref ActOnFinishCXXInClassMemberInitializer, even if | |||
3915 | /// parsing or instantiating the initializer failed. | |||
3916 | void Sema::ActOnStartCXXInClassMemberInitializer() { | |||
3917 | // Create a synthetic function scope to represent the call to the constructor | |||
3918 | // that notionally surrounds a use of this initializer. | |||
3919 | PushFunctionScope(); | |||
3920 | } | |||
3921 | ||||
3922 | void Sema::ActOnStartTrailingRequiresClause(Scope *S, Declarator &D) { | |||
3923 | if (!D.isFunctionDeclarator()) | |||
3924 | return; | |||
3925 | auto &FTI = D.getFunctionTypeInfo(); | |||
3926 | if (!FTI.Params) | |||
3927 | return; | |||
3928 | for (auto &Param : ArrayRef<DeclaratorChunk::ParamInfo>(FTI.Params, | |||
3929 | FTI.NumParams)) { | |||
3930 | auto *ParamDecl = cast<NamedDecl>(Param.Param); | |||
3931 | if (ParamDecl->getDeclName()) | |||
3932 | PushOnScopeChains(ParamDecl, S, /*AddToContext=*/false); | |||
3933 | } | |||
3934 | } | |||
3935 | ||||
3936 | ExprResult Sema::ActOnFinishTrailingRequiresClause(ExprResult ConstraintExpr) { | |||
3937 | return ActOnRequiresClause(ConstraintExpr); | |||
3938 | } | |||
3939 | ||||
3940 | ExprResult Sema::ActOnRequiresClause(ExprResult ConstraintExpr) { | |||
3941 | if (ConstraintExpr.isInvalid()) | |||
3942 | return ExprError(); | |||
3943 | ||||
3944 | ConstraintExpr = CorrectDelayedTyposInExpr(ConstraintExpr); | |||
3945 | if (ConstraintExpr.isInvalid()) | |||
3946 | return ExprError(); | |||
3947 | ||||
3948 | if (DiagnoseUnexpandedParameterPack(ConstraintExpr.get(), | |||
3949 | UPPC_RequiresClause)) | |||
3950 | return ExprError(); | |||
3951 | ||||
3952 | return ConstraintExpr; | |||
3953 | } | |||
3954 | ||||
3955 | /// This is invoked after parsing an in-class initializer for a | |||
3956 | /// non-static C++ class member, and after instantiating an in-class initializer | |||
3957 | /// in a class template. Such actions are deferred until the class is complete. | |||
3958 | void Sema::ActOnFinishCXXInClassMemberInitializer(Decl *D, | |||
3959 | SourceLocation InitLoc, | |||
3960 | Expr *InitExpr) { | |||
3961 | // Pop the notional constructor scope we created earlier. | |||
3962 | PopFunctionScopeInfo(nullptr, D); | |||
3963 | ||||
3964 | FieldDecl *FD = dyn_cast<FieldDecl>(D); | |||
3965 | assert((isa<MSPropertyDecl>(D) || FD->getInClassInitStyle() != ICIS_NoInit) &&(((isa<MSPropertyDecl>(D) || FD->getInClassInitStyle () != ICIS_NoInit) && "must set init style when field is created" ) ? static_cast<void> (0) : __assert_fail ("(isa<MSPropertyDecl>(D) || FD->getInClassInitStyle() != ICIS_NoInit) && \"must set init style when field is created\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 3966, __PRETTY_FUNCTION__)) | |||
3966 | "must set init style when field is created")(((isa<MSPropertyDecl>(D) || FD->getInClassInitStyle () != ICIS_NoInit) && "must set init style when field is created" ) ? static_cast<void> (0) : __assert_fail ("(isa<MSPropertyDecl>(D) || FD->getInClassInitStyle() != ICIS_NoInit) && \"must set init style when field is created\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 3966, __PRETTY_FUNCTION__)); | |||
3967 | ||||
3968 | if (!InitExpr) { | |||
3969 | D->setInvalidDecl(); | |||
3970 | if (FD) | |||
3971 | FD->removeInClassInitializer(); | |||
3972 | return; | |||
3973 | } | |||
3974 | ||||
3975 | if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { | |||
3976 | FD->setInvalidDecl(); | |||
3977 | FD->removeInClassInitializer(); | |||
3978 | return; | |||
3979 | } | |||
3980 | ||||
3981 | ExprResult Init = InitExpr; | |||
3982 | if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { | |||
3983 | InitializedEntity Entity = | |||
3984 | InitializedEntity::InitializeMemberFromDefaultMemberInitializer(FD); | |||
3985 | InitializationKind Kind = | |||
3986 | FD->getInClassInitStyle() == ICIS_ListInit | |||
3987 | ? InitializationKind::CreateDirectList(InitExpr->getBeginLoc(), | |||
3988 | InitExpr->getBeginLoc(), | |||
3989 | InitExpr->getEndLoc()) | |||
3990 | : InitializationKind::CreateCopy(InitExpr->getBeginLoc(), InitLoc); | |||
3991 | InitializationSequence Seq(*this, Entity, Kind, InitExpr); | |||
3992 | Init = Seq.Perform(*this, Entity, Kind, InitExpr); | |||
3993 | if (Init.isInvalid()) { | |||
3994 | FD->setInvalidDecl(); | |||
3995 | return; | |||
3996 | } | |||
3997 | } | |||
3998 | ||||
3999 | // C++11 [class.base.init]p7: | |||
4000 | // The initialization of each base and member constitutes a | |||
4001 | // full-expression. | |||
4002 | Init = ActOnFinishFullExpr(Init.get(), InitLoc, /*DiscardedValue*/ false); | |||
4003 | if (Init.isInvalid()) { | |||
4004 | FD->setInvalidDecl(); | |||
4005 | return; | |||
4006 | } | |||
4007 | ||||
4008 | InitExpr = Init.get(); | |||
4009 | ||||
4010 | FD->setInClassInitializer(InitExpr); | |||
4011 | } | |||
4012 | ||||
4013 | /// Find the direct and/or virtual base specifiers that | |||
4014 | /// correspond to the given base type, for use in base initialization | |||
4015 | /// within a constructor. | |||
4016 | static bool FindBaseInitializer(Sema &SemaRef, | |||
4017 | CXXRecordDecl *ClassDecl, | |||
4018 | QualType BaseType, | |||
4019 | const CXXBaseSpecifier *&DirectBaseSpec, | |||
4020 | const CXXBaseSpecifier *&VirtualBaseSpec) { | |||
4021 | // First, check for a direct base class. | |||
4022 | DirectBaseSpec = nullptr; | |||
4023 | for (const auto &Base : ClassDecl->bases()) { | |||
4024 | if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base.getType())) { | |||
4025 | // We found a direct base of this type. That's what we're | |||
4026 | // initializing. | |||
4027 | DirectBaseSpec = &Base; | |||
4028 | break; | |||
4029 | } | |||
4030 | } | |||
4031 | ||||
4032 | // Check for a virtual base class. | |||
4033 | // FIXME: We might be able to short-circuit this if we know in advance that | |||
4034 | // there are no virtual bases. | |||
4035 | VirtualBaseSpec = nullptr; | |||
4036 | if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { | |||
4037 | // We haven't found a base yet; search the class hierarchy for a | |||
4038 | // virtual base class. | |||
4039 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, | |||
4040 | /*DetectVirtual=*/false); | |||
4041 | if (SemaRef.IsDerivedFrom(ClassDecl->getLocation(), | |||
4042 | SemaRef.Context.getTypeDeclType(ClassDecl), | |||
4043 | BaseType, Paths)) { | |||
4044 | for (CXXBasePaths::paths_iterator Path = Paths.begin(); | |||
4045 | Path != Paths.end(); ++Path) { | |||
4046 | if (Path->back().Base->isVirtual()) { | |||
4047 | VirtualBaseSpec = Path->back().Base; | |||
4048 | break; | |||
4049 | } | |||
4050 | } | |||
4051 | } | |||
4052 | } | |||
4053 | ||||
4054 | return DirectBaseSpec || VirtualBaseSpec; | |||
4055 | } | |||
4056 | ||||
4057 | /// Handle a C++ member initializer using braced-init-list syntax. | |||
4058 | MemInitResult | |||
4059 | Sema::ActOnMemInitializer(Decl *ConstructorD, | |||
4060 | Scope *S, | |||
4061 | CXXScopeSpec &SS, | |||
4062 | IdentifierInfo *MemberOrBase, | |||
4063 | ParsedType TemplateTypeTy, | |||
4064 | const DeclSpec &DS, | |||
4065 | SourceLocation IdLoc, | |||
4066 | Expr *InitList, | |||
4067 | SourceLocation EllipsisLoc) { | |||
4068 | return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, | |||
4069 | DS, IdLoc, InitList, | |||
4070 | EllipsisLoc); | |||
4071 | } | |||
4072 | ||||
4073 | /// Handle a C++ member initializer using parentheses syntax. | |||
4074 | MemInitResult | |||
4075 | Sema::ActOnMemInitializer(Decl *ConstructorD, | |||
4076 | Scope *S, | |||
4077 | CXXScopeSpec &SS, | |||
4078 | IdentifierInfo *MemberOrBase, | |||
4079 | ParsedType TemplateTypeTy, | |||
4080 | const DeclSpec &DS, | |||
4081 | SourceLocation IdLoc, | |||
4082 | SourceLocation LParenLoc, | |||
4083 | ArrayRef<Expr *> Args, | |||
4084 | SourceLocation RParenLoc, | |||
4085 | SourceLocation EllipsisLoc) { | |||
4086 | Expr *List = ParenListExpr::Create(Context, LParenLoc, Args, RParenLoc); | |||
4087 | return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, | |||
4088 | DS, IdLoc, List, EllipsisLoc); | |||
4089 | } | |||
4090 | ||||
4091 | namespace { | |||
4092 | ||||
4093 | // Callback to only accept typo corrections that can be a valid C++ member | |||
4094 | // intializer: either a non-static field member or a base class. | |||
4095 | class MemInitializerValidatorCCC final : public CorrectionCandidateCallback { | |||
4096 | public: | |||
4097 | explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) | |||
4098 | : ClassDecl(ClassDecl) {} | |||
4099 | ||||
4100 | bool ValidateCandidate(const TypoCorrection &candidate) override { | |||
4101 | if (NamedDecl *ND = candidate.getCorrectionDecl()) { | |||
4102 | if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) | |||
4103 | return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); | |||
4104 | return isa<TypeDecl>(ND); | |||
4105 | } | |||
4106 | return false; | |||
4107 | } | |||
4108 | ||||
4109 | std::unique_ptr<CorrectionCandidateCallback> clone() override { | |||
4110 | return std::make_unique<MemInitializerValidatorCCC>(*this); | |||
4111 | } | |||
4112 | ||||
4113 | private: | |||
4114 | CXXRecordDecl *ClassDecl; | |||
4115 | }; | |||
4116 | ||||
4117 | } | |||
4118 | ||||
4119 | ValueDecl *Sema::tryLookupCtorInitMemberDecl(CXXRecordDecl *ClassDecl, | |||
4120 | CXXScopeSpec &SS, | |||
4121 | ParsedType TemplateTypeTy, | |||
4122 | IdentifierInfo *MemberOrBase) { | |||
4123 | if (SS.getScopeRep() || TemplateTypeTy) | |||
4124 | return nullptr; | |||
4125 | DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase); | |||
4126 | if (Result.empty()) | |||
4127 | return nullptr; | |||
4128 | ValueDecl *Member; | |||
4129 | if ((Member = dyn_cast<FieldDecl>(Result.front())) || | |||
4130 | (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) | |||
4131 | return Member; | |||
4132 | return nullptr; | |||
4133 | } | |||
4134 | ||||
4135 | /// Handle a C++ member initializer. | |||
4136 | MemInitResult | |||
4137 | Sema::BuildMemInitializer(Decl *ConstructorD, | |||
4138 | Scope *S, | |||
4139 | CXXScopeSpec &SS, | |||
4140 | IdentifierInfo *MemberOrBase, | |||
4141 | ParsedType TemplateTypeTy, | |||
4142 | const DeclSpec &DS, | |||
4143 | SourceLocation IdLoc, | |||
4144 | Expr *Init, | |||
4145 | SourceLocation EllipsisLoc) { | |||
4146 | ExprResult Res = CorrectDelayedTyposInExpr(Init); | |||
4147 | if (!Res.isUsable()) | |||
4148 | return true; | |||
4149 | Init = Res.get(); | |||
4150 | ||||
4151 | if (!ConstructorD) | |||
4152 | return true; | |||
4153 | ||||
4154 | AdjustDeclIfTemplate(ConstructorD); | |||
4155 | ||||
4156 | CXXConstructorDecl *Constructor | |||
4157 | = dyn_cast<CXXConstructorDecl>(ConstructorD); | |||
4158 | if (!Constructor) { | |||
4159 | // The user wrote a constructor initializer on a function that is | |||
4160 | // not a C++ constructor. Ignore the error for now, because we may | |||
4161 | // have more member initializers coming; we'll diagnose it just | |||
4162 | // once in ActOnMemInitializers. | |||
4163 | return true; | |||
4164 | } | |||
4165 | ||||
4166 | CXXRecordDecl *ClassDecl = Constructor->getParent(); | |||
4167 | ||||
4168 | // C++ [class.base.init]p2: | |||
4169 | // Names in a mem-initializer-id are looked up in the scope of the | |||
4170 | // constructor's class and, if not found in that scope, are looked | |||
4171 | // up in the scope containing the constructor's definition. | |||
4172 | // [Note: if the constructor's class contains a member with the | |||
4173 | // same name as a direct or virtual base class of the class, a | |||
4174 | // mem-initializer-id naming the member or base class and composed | |||
4175 | // of a single identifier refers to the class member. A | |||
4176 | // mem-initializer-id for the hidden base class may be specified | |||
4177 | // using a qualified name. ] | |||
4178 | ||||
4179 | // Look for a member, first. | |||
4180 | if (ValueDecl *Member = tryLookupCtorInitMemberDecl( | |||
4181 | ClassDecl, SS, TemplateTypeTy, MemberOrBase)) { | |||
4182 | if (EllipsisLoc.isValid()) | |||
4183 | Diag(EllipsisLoc, diag::err_pack_expansion_member_init) | |||
4184 | << MemberOrBase | |||
4185 | << SourceRange(IdLoc, Init->getSourceRange().getEnd()); | |||
4186 | ||||
4187 | return BuildMemberInitializer(Member, Init, IdLoc); | |||
4188 | } | |||
4189 | // It didn't name a member, so see if it names a class. | |||
4190 | QualType BaseType; | |||
4191 | TypeSourceInfo *TInfo = nullptr; | |||
4192 | ||||
4193 | if (TemplateTypeTy) { | |||
4194 | BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); | |||
4195 | if (BaseType.isNull()) | |||
4196 | return true; | |||
4197 | } else if (DS.getTypeSpecType() == TST_decltype) { | |||
4198 | BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); | |||
4199 | } else if (DS.getTypeSpecType() == TST_decltype_auto) { | |||
4200 | Diag(DS.getTypeSpecTypeLoc(), diag::err_decltype_auto_invalid); | |||
4201 | return true; | |||
4202 | } else { | |||
4203 | LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); | |||
4204 | LookupParsedName(R, S, &SS); | |||
4205 | ||||
4206 | TypeDecl *TyD = R.getAsSingle<TypeDecl>(); | |||
4207 | if (!TyD) { | |||
4208 | if (R.isAmbiguous()) return true; | |||
4209 | ||||
4210 | // We don't want access-control diagnostics here. | |||
4211 | R.suppressDiagnostics(); | |||
4212 | ||||
4213 | if (SS.isSet() && isDependentScopeSpecifier(SS)) { | |||
4214 | bool NotUnknownSpecialization = false; | |||
4215 | DeclContext *DC = computeDeclContext(SS, false); | |||
4216 | if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) | |||
4217 | NotUnknownSpecialization = !Record->hasAnyDependentBases(); | |||
4218 | ||||
4219 | if (!NotUnknownSpecialization) { | |||
4220 | // When the scope specifier can refer to a member of an unknown | |||
4221 | // specialization, we take it as a type name. | |||
4222 | BaseType = CheckTypenameType(ETK_None, SourceLocation(), | |||
4223 | SS.getWithLocInContext(Context), | |||
4224 | *MemberOrBase, IdLoc); | |||
4225 | if (BaseType.isNull()) | |||
4226 | return true; | |||
4227 | ||||
4228 | TInfo = Context.CreateTypeSourceInfo(BaseType); | |||
4229 | DependentNameTypeLoc TL = | |||
4230 | TInfo->getTypeLoc().castAs<DependentNameTypeLoc>(); | |||
4231 | if (!TL.isNull()) { | |||
4232 | TL.setNameLoc(IdLoc); | |||
4233 | TL.setElaboratedKeywordLoc(SourceLocation()); | |||
4234 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); | |||
4235 | } | |||
4236 | ||||
4237 | R.clear(); | |||
4238 | R.setLookupName(MemberOrBase); | |||
4239 | } | |||
4240 | } | |||
4241 | ||||
4242 | // If no results were found, try to correct typos. | |||
4243 | TypoCorrection Corr; | |||
4244 | MemInitializerValidatorCCC CCC(ClassDecl); | |||
4245 | if (R.empty() && BaseType.isNull() && | |||
4246 | (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, | |||
4247 | CCC, CTK_ErrorRecovery, ClassDecl))) { | |||
4248 | if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { | |||
4249 | // We have found a non-static data member with a similar | |||
4250 | // name to what was typed; complain and initialize that | |||
4251 | // member. | |||
4252 | diagnoseTypo(Corr, | |||
4253 | PDiag(diag::err_mem_init_not_member_or_class_suggest) | |||
4254 | << MemberOrBase << true); | |||
4255 | return BuildMemberInitializer(Member, Init, IdLoc); | |||
4256 | } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { | |||
4257 | const CXXBaseSpecifier *DirectBaseSpec; | |||
4258 | const CXXBaseSpecifier *VirtualBaseSpec; | |||
4259 | if (FindBaseInitializer(*this, ClassDecl, | |||
4260 | Context.getTypeDeclType(Type), | |||
4261 | DirectBaseSpec, VirtualBaseSpec)) { | |||
4262 | // We have found a direct or virtual base class with a | |||
4263 | // similar name to what was typed; complain and initialize | |||
4264 | // that base class. | |||
4265 | diagnoseTypo(Corr, | |||
4266 | PDiag(diag::err_mem_init_not_member_or_class_suggest) | |||
4267 | << MemberOrBase << false, | |||
4268 | PDiag() /*Suppress note, we provide our own.*/); | |||
4269 | ||||
4270 | const CXXBaseSpecifier *BaseSpec = DirectBaseSpec ? DirectBaseSpec | |||
4271 | : VirtualBaseSpec; | |||
4272 | Diag(BaseSpec->getBeginLoc(), diag::note_base_class_specified_here) | |||
4273 | << BaseSpec->getType() << BaseSpec->getSourceRange(); | |||
4274 | ||||
4275 | TyD = Type; | |||
4276 | } | |||
4277 | } | |||
4278 | } | |||
4279 | ||||
4280 | if (!TyD && BaseType.isNull()) { | |||
4281 | Diag(IdLoc, diag::err_mem_init_not_member_or_class) | |||
4282 | << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); | |||
4283 | return true; | |||
4284 | } | |||
4285 | } | |||
4286 | ||||
4287 | if (BaseType.isNull()) { | |||
4288 | BaseType = Context.getTypeDeclType(TyD); | |||
4289 | MarkAnyDeclReferenced(TyD->getLocation(), TyD, /*OdrUse=*/false); | |||
4290 | if (SS.isSet()) { | |||
4291 | BaseType = Context.getElaboratedType(ETK_None, SS.getScopeRep(), | |||
4292 | BaseType); | |||
4293 | TInfo = Context.CreateTypeSourceInfo(BaseType); | |||
4294 | ElaboratedTypeLoc TL = TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>(); | |||
4295 | TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(IdLoc); | |||
4296 | TL.setElaboratedKeywordLoc(SourceLocation()); | |||
4297 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); | |||
4298 | } | |||
4299 | } | |||
4300 | } | |||
4301 | ||||
4302 | if (!TInfo) | |||
4303 | TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); | |||
4304 | ||||
4305 | return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); | |||
4306 | } | |||
4307 | ||||
4308 | MemInitResult | |||
4309 | Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, | |||
4310 | SourceLocation IdLoc) { | |||
4311 | FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); | |||
4312 | IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); | |||
4313 | assert((DirectMember || IndirectMember) &&(((DirectMember || IndirectMember) && "Member must be a FieldDecl or IndirectFieldDecl" ) ? static_cast<void> (0) : __assert_fail ("(DirectMember || IndirectMember) && \"Member must be a FieldDecl or IndirectFieldDecl\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 4314, __PRETTY_FUNCTION__)) | |||
4314 | "Member must be a FieldDecl or IndirectFieldDecl")(((DirectMember || IndirectMember) && "Member must be a FieldDecl or IndirectFieldDecl" ) ? static_cast<void> (0) : __assert_fail ("(DirectMember || IndirectMember) && \"Member must be a FieldDecl or IndirectFieldDecl\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 4314, __PRETTY_FUNCTION__)); | |||
4315 | ||||
4316 | if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) | |||
4317 | return true; | |||
4318 | ||||
4319 | if (Member->isInvalidDecl()) | |||
4320 | return true; | |||
4321 | ||||
4322 | MultiExprArg Args; | |||
4323 | if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { | |||
4324 | Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); | |||
4325 | } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) { | |||
4326 | Args = MultiExprArg(InitList->getInits(), InitList->getNumInits()); | |||
4327 | } else { | |||
4328 | // Template instantiation doesn't reconstruct ParenListExprs for us. | |||
4329 | Args = Init; | |||
4330 | } | |||
4331 | ||||
4332 | SourceRange InitRange = Init->getSourceRange(); | |||
4333 | ||||
4334 | if (Member->getType()->isDependentType() || Init->isTypeDependent()) { | |||
4335 | // Can't check initialization for a member of dependent type or when | |||
4336 | // any of the arguments are type-dependent expressions. | |||
4337 | DiscardCleanupsInEvaluationContext(); | |||
4338 | } else { | |||
4339 | bool InitList = false; | |||
4340 | if (isa<InitListExpr>(Init)) { | |||
4341 | InitList = true; | |||
4342 | Args = Init; | |||
4343 | } | |||
4344 | ||||
4345 | // Initialize the member. | |||
4346 | InitializedEntity MemberEntity = | |||
4347 | DirectMember ? InitializedEntity::InitializeMember(DirectMember, nullptr) | |||
4348 | : InitializedEntity::InitializeMember(IndirectMember, | |||
4349 | nullptr); | |||
4350 | InitializationKind Kind = | |||
4351 | InitList ? InitializationKind::CreateDirectList( | |||
4352 | IdLoc, Init->getBeginLoc(), Init->getEndLoc()) | |||
4353 | : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), | |||
4354 | InitRange.getEnd()); | |||
4355 | ||||
4356 | InitializationSequence InitSeq(*this, MemberEntity, Kind, Args); | |||
4357 | ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, Args, | |||
4358 | nullptr); | |||
4359 | if (MemberInit.isInvalid()) | |||
4360 | return true; | |||
4361 | ||||
4362 | // C++11 [class.base.init]p7: | |||
4363 | // The initialization of each base and member constitutes a | |||
4364 | // full-expression. | |||
4365 | MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin(), | |||
4366 | /*DiscardedValue*/ false); | |||
4367 | if (MemberInit.isInvalid()) | |||
4368 | return true; | |||
4369 | ||||
4370 | Init = MemberInit.get(); | |||
4371 | } | |||
4372 | ||||
4373 | if (DirectMember) { | |||
4374 | return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, | |||
4375 | InitRange.getBegin(), Init, | |||
4376 | InitRange.getEnd()); | |||
4377 | } else { | |||
4378 | return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, | |||
4379 | InitRange.getBegin(), Init, | |||
4380 | InitRange.getEnd()); | |||
4381 | } | |||
4382 | } | |||
4383 | ||||
4384 | MemInitResult | |||
4385 | Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, | |||
4386 | CXXRecordDecl *ClassDecl) { | |||
4387 | SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); | |||
4388 | if (!LangOpts.CPlusPlus11) | |||
4389 | return Diag(NameLoc, diag::err_delegating_ctor) | |||
4390 | << TInfo->getTypeLoc().getLocalSourceRange(); | |||
4391 | Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); | |||
4392 | ||||
4393 | bool InitList = true; | |||
4394 | MultiExprArg Args = Init; | |||
4395 | if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { | |||
4396 | InitList = false; | |||
4397 | Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); | |||
4398 | } | |||
4399 | ||||
4400 | SourceRange InitRange = Init->getSourceRange(); | |||
4401 | // Initialize the object. | |||
4402 | InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( | |||
4403 | QualType(ClassDecl->getTypeForDecl(), 0)); | |||
4404 | InitializationKind Kind = | |||
4405 | InitList ? InitializationKind::CreateDirectList( | |||
4406 | NameLoc, Init->getBeginLoc(), Init->getEndLoc()) | |||
4407 | : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), | |||
4408 | InitRange.getEnd()); | |||
4409 | InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args); | |||
4410 | ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, | |||
4411 | Args, nullptr); | |||
4412 | if (DelegationInit.isInvalid()) | |||
4413 | return true; | |||
4414 | ||||
4415 | assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() &&((cast<CXXConstructExpr>(DelegationInit.get())->getConstructor () && "Delegating constructor with no target?") ? static_cast <void> (0) : __assert_fail ("cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && \"Delegating constructor with no target?\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 4416, __PRETTY_FUNCTION__)) | |||
4416 | "Delegating constructor with no target?")((cast<CXXConstructExpr>(DelegationInit.get())->getConstructor () && "Delegating constructor with no target?") ? static_cast <void> (0) : __assert_fail ("cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && \"Delegating constructor with no target?\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 4416, __PRETTY_FUNCTION__)); | |||
4417 | ||||
4418 | // C++11 [class.base.init]p7: | |||
4419 | // The initialization of each base and member constitutes a | |||
4420 | // full-expression. | |||
4421 | DelegationInit = ActOnFinishFullExpr( | |||
4422 | DelegationInit.get(), InitRange.getBegin(), /*DiscardedValue*/ false); | |||
4423 | if (DelegationInit.isInvalid()) | |||
4424 | return true; | |||
4425 | ||||
4426 | // If we are in a dependent context, template instantiation will | |||
4427 | // perform this type-checking again. Just save the arguments that we | |||
4428 | // received in a ParenListExpr. | |||
4429 | // FIXME: This isn't quite ideal, since our ASTs don't capture all | |||
4430 | // of the information that we have about the base | |||
4431 | // initializer. However, deconstructing the ASTs is a dicey process, | |||
4432 | // and this approach is far more likely to get the corner cases right. | |||
4433 | if (CurContext->isDependentContext()) | |||
4434 | DelegationInit = Init; | |||
4435 | ||||
4436 | return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), | |||
4437 | DelegationInit.getAs<Expr>(), | |||
4438 | InitRange.getEnd()); | |||
4439 | } | |||
4440 | ||||
4441 | MemInitResult | |||
4442 | Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, | |||
4443 | Expr *Init, CXXRecordDecl *ClassDecl, | |||
4444 | SourceLocation EllipsisLoc) { | |||
4445 | SourceLocation BaseLoc | |||
4446 | = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); | |||
4447 | ||||
4448 | if (!BaseType->isDependentType() && !BaseType->isRecordType()) | |||
4449 | return Diag(BaseLoc, diag::err_base_init_does_not_name_class) | |||
4450 | << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); | |||
4451 | ||||
4452 | // C++ [class.base.init]p2: | |||
4453 | // [...] Unless the mem-initializer-id names a nonstatic data | |||
4454 | // member of the constructor's class or a direct or virtual base | |||
4455 | // of that class, the mem-initializer is ill-formed. A | |||
4456 | // mem-initializer-list can initialize a base class using any | |||
4457 | // name that denotes that base class type. | |||
4458 | bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); | |||
4459 | ||||
4460 | SourceRange InitRange = Init->getSourceRange(); | |||
4461 | if (EllipsisLoc.isValid()) { | |||
4462 | // This is a pack expansion. | |||
4463 | if (!BaseType->containsUnexpandedParameterPack()) { | |||
4464 | Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) | |||
4465 | << SourceRange(BaseLoc, InitRange.getEnd()); | |||
4466 | ||||
4467 | EllipsisLoc = SourceLocation(); | |||
4468 | } | |||
4469 | } else { | |||
4470 | // Check for any unexpanded parameter packs. | |||
4471 | if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) | |||
4472 | return true; | |||
4473 | ||||
4474 | if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) | |||
4475 | return true; | |||
4476 | } | |||
4477 | ||||
4478 | // Check for direct and virtual base classes. | |||
4479 | const CXXBaseSpecifier *DirectBaseSpec = nullptr; | |||
4480 | const CXXBaseSpecifier *VirtualBaseSpec = nullptr; | |||
4481 | if (!Dependent) { | |||
4482 | if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), | |||
4483 | BaseType)) | |||
4484 | return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); | |||
4485 | ||||
4486 | FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, | |||
4487 | VirtualBaseSpec); | |||
4488 | ||||
4489 | // C++ [base.class.init]p2: | |||
4490 | // Unless the mem-initializer-id names a nonstatic data member of the | |||
4491 | // constructor's class or a direct or virtual base of that class, the | |||
4492 | // mem-initializer is ill-formed. | |||
4493 | if (!DirectBaseSpec && !VirtualBaseSpec) { | |||
4494 | // If the class has any dependent bases, then it's possible that | |||
4495 | // one of those types will resolve to the same type as | |||
4496 | // BaseType. Therefore, just treat this as a dependent base | |||
4497 | // class initialization. FIXME: Should we try to check the | |||
4498 | // initialization anyway? It seems odd. | |||
4499 | if (ClassDecl->hasAnyDependentBases()) | |||
4500 | Dependent = true; | |||
4501 | else | |||
4502 | return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) | |||
4503 | << BaseType << Context.getTypeDeclType(ClassDecl) | |||
4504 | << BaseTInfo->getTypeLoc().getLocalSourceRange(); | |||
4505 | } | |||
4506 | } | |||
4507 | ||||
4508 | if (Dependent) { | |||
4509 | DiscardCleanupsInEvaluationContext(); | |||
4510 | ||||
4511 | return new (Context) CXXCtorInitializer(Context, BaseTInfo, | |||
4512 | /*IsVirtual=*/false, | |||
4513 | InitRange.getBegin(), Init, | |||
4514 | InitRange.getEnd(), EllipsisLoc); | |||
4515 | } | |||
4516 | ||||
4517 | // C++ [base.class.init]p2: | |||
4518 | // If a mem-initializer-id is ambiguous because it designates both | |||
4519 | // a direct non-virtual base class and an inherited virtual base | |||
4520 | // class, the mem-initializer is ill-formed. | |||
4521 | if (DirectBaseSpec && VirtualBaseSpec) | |||
4522 | return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) | |||
4523 | << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); | |||
4524 | ||||
4525 | const CXXBaseSpecifier *BaseSpec = DirectBaseSpec; | |||
4526 | if (!BaseSpec) | |||
4527 | BaseSpec = VirtualBaseSpec; | |||
4528 | ||||
4529 | // Initialize the base. | |||
4530 | bool InitList = true; | |||
4531 | MultiExprArg Args = Init; | |||
4532 | if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { | |||
4533 | InitList = false; | |||
4534 | Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); | |||
4535 | } | |||
4536 | ||||
4537 | InitializedEntity BaseEntity = | |||
4538 | InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); | |||
4539 | InitializationKind Kind = | |||
4540 | InitList ? InitializationKind::CreateDirectList(BaseLoc) | |||
4541 | : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), | |||
4542 | InitRange.getEnd()); | |||
4543 | InitializationSequence InitSeq(*this, BaseEntity, Kind, Args); | |||
4544 | ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, Args, nullptr); | |||
4545 | if (BaseInit.isInvalid()) | |||
4546 | return true; | |||
4547 | ||||
4548 | // C++11 [class.base.init]p7: | |||
4549 | // The initialization of each base and member constitutes a | |||
4550 | // full-expression. | |||
4551 | BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin(), | |||
4552 | /*DiscardedValue*/ false); | |||
4553 | if (BaseInit.isInvalid()) | |||
4554 | return true; | |||
4555 | ||||
4556 | // If we are in a dependent context, template instantiation will | |||
4557 | // perform this type-checking again. Just save the arguments that we | |||
4558 | // received in a ParenListExpr. | |||
4559 | // FIXME: This isn't quite ideal, since our ASTs don't capture all | |||
4560 | // of the information that we have about the base | |||
4561 | // initializer. However, deconstructing the ASTs is a dicey process, | |||
4562 | // and this approach is far more likely to get the corner cases right. | |||
4563 | if (CurContext->isDependentContext()) | |||
4564 | BaseInit = Init; | |||
4565 | ||||
4566 | return new (Context) CXXCtorInitializer(Context, BaseTInfo, | |||
4567 | BaseSpec->isVirtual(), | |||
4568 | InitRange.getBegin(), | |||
4569 | BaseInit.getAs<Expr>(), | |||
4570 | InitRange.getEnd(), EllipsisLoc); | |||
4571 | } | |||
4572 | ||||
4573 | // Create a static_cast\<T&&>(expr). | |||
4574 | static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) { | |||
4575 | if (T.isNull()) T = E->getType(); | |||
4576 | QualType TargetType = SemaRef.BuildReferenceType( | |||
4577 | T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName()); | |||
4578 | SourceLocation ExprLoc = E->getBeginLoc(); | |||
4579 | TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( | |||
4580 | TargetType, ExprLoc); | |||
4581 | ||||
4582 | return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, | |||
4583 | SourceRange(ExprLoc, ExprLoc), | |||
4584 | E->getSourceRange()).get(); | |||
4585 | } | |||
4586 | ||||
4587 | /// ImplicitInitializerKind - How an implicit base or member initializer should | |||
4588 | /// initialize its base or member. | |||
4589 | enum ImplicitInitializerKind { | |||
4590 | IIK_Default, | |||
4591 | IIK_Copy, | |||
4592 | IIK_Move, | |||
4593 | IIK_Inherit | |||
4594 | }; | |||
4595 | ||||
4596 | static bool | |||
4597 | BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, | |||
4598 | ImplicitInitializerKind ImplicitInitKind, | |||
4599 | CXXBaseSpecifier *BaseSpec, | |||
4600 | bool IsInheritedVirtualBase, | |||
4601 | CXXCtorInitializer *&CXXBaseInit) { | |||
4602 | InitializedEntity InitEntity | |||
4603 | = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, | |||
4604 | IsInheritedVirtualBase); | |||
4605 | ||||
4606 | ExprResult BaseInit; | |||
4607 | ||||
4608 | switch (ImplicitInitKind) { | |||
4609 | case IIK_Inherit: | |||
4610 | case IIK_Default: { | |||
4611 | InitializationKind InitKind | |||
4612 | = InitializationKind::CreateDefault(Constructor->getLocation()); | |||
4613 | InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); | |||
4614 | BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, None); | |||
4615 | break; | |||
4616 | } | |||
4617 | ||||
4618 | case IIK_Move: | |||
4619 | case IIK_Copy: { | |||
4620 | bool Moving = ImplicitInitKind == IIK_Move; | |||
4621 | ParmVarDecl *Param = Constructor->getParamDecl(0); | |||
4622 | QualType ParamType = Param->getType().getNonReferenceType(); | |||
4623 | ||||
4624 | Expr *CopyCtorArg = | |||
4625 | DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), | |||
4626 | SourceLocation(), Param, false, | |||
4627 | Constructor->getLocation(), ParamType, | |||
4628 | VK_LValue, nullptr); | |||
4629 | ||||
4630 | SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); | |||
4631 | ||||
4632 | // Cast to the base class to avoid ambiguities. | |||
4633 | QualType ArgTy = | |||
4634 | SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), | |||
4635 | ParamType.getQualifiers()); | |||
4636 | ||||
4637 | if (Moving) { | |||
4638 | CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); | |||
4639 | } | |||
4640 | ||||
4641 | CXXCastPath BasePath; | |||
4642 | BasePath.push_back(BaseSpec); | |||
4643 | CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, | |||
4644 | CK_UncheckedDerivedToBase, | |||
4645 | Moving ? VK_XValue : VK_LValue, | |||
4646 | &BasePath).get(); | |||
4647 | ||||
4648 | InitializationKind InitKind | |||
4649 | = InitializationKind::CreateDirect(Constructor->getLocation(), | |||
4650 | SourceLocation(), SourceLocation()); | |||
4651 | InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, CopyCtorArg); | |||
4652 | BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, CopyCtorArg); | |||
4653 | break; | |||
4654 | } | |||
4655 | } | |||
4656 | ||||
4657 | BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); | |||
4658 | if (BaseInit.isInvalid()) | |||
4659 | return true; | |||
4660 | ||||
4661 | CXXBaseInit = | |||
4662 | new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, | |||
4663 | SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), | |||
4664 | SourceLocation()), | |||
4665 | BaseSpec->isVirtual(), | |||
4666 | SourceLocation(), | |||
4667 | BaseInit.getAs<Expr>(), | |||
4668 | SourceLocation(), | |||
4669 | SourceLocation()); | |||
4670 | ||||
4671 | return false; | |||
4672 | } | |||
4673 | ||||
4674 | static bool RefersToRValueRef(Expr *MemRef) { | |||
4675 | ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); | |||
4676 | return Referenced->getType()->isRValueReferenceType(); | |||
4677 | } | |||
4678 | ||||
4679 | static bool | |||
4680 | BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, | |||
4681 | ImplicitInitializerKind ImplicitInitKind, | |||
4682 | FieldDecl *Field, IndirectFieldDecl *Indirect, | |||
4683 | CXXCtorInitializer *&CXXMemberInit) { | |||
4684 | if (Field->isInvalidDecl()) | |||
4685 | return true; | |||
4686 | ||||
4687 | SourceLocation Loc = Constructor->getLocation(); | |||
4688 | ||||
4689 | if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { | |||
4690 | bool Moving = ImplicitInitKind == IIK_Move; | |||
4691 | ParmVarDecl *Param = Constructor->getParamDecl(0); | |||
4692 | QualType ParamType = Param->getType().getNonReferenceType(); | |||
4693 | ||||
4694 | // Suppress copying zero-width bitfields. | |||
4695 | if (Field->isZeroLengthBitField(SemaRef.Context)) | |||
4696 | return false; | |||
4697 | ||||
4698 | Expr *MemberExprBase = | |||
4699 | DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), | |||
4700 | SourceLocation(), Param, false, | |||
4701 | Loc, ParamType, VK_LValue, nullptr); | |||
4702 | ||||
4703 | SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); | |||
4704 | ||||
4705 | if (Moving) { | |||
4706 | MemberExprBase = CastForMoving(SemaRef, MemberExprBase); | |||
4707 | } | |||
4708 | ||||
4709 | // Build a reference to this field within the parameter. | |||
4710 | CXXScopeSpec SS; | |||
4711 | LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, | |||
4712 | Sema::LookupMemberName); | |||
4713 | MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) | |||
4714 | : cast<ValueDecl>(Field), AS_public); | |||
4715 | MemberLookup.resolveKind(); | |||
4716 | ExprResult CtorArg | |||
4717 | = SemaRef.BuildMemberReferenceExpr(MemberExprBase, | |||
4718 | ParamType, Loc, | |||
4719 | /*IsArrow=*/false, | |||
4720 | SS, | |||
4721 | /*TemplateKWLoc=*/SourceLocation(), | |||
4722 | /*FirstQualifierInScope=*/nullptr, | |||
4723 | MemberLookup, | |||
4724 | /*TemplateArgs=*/nullptr, | |||
4725 | /*S*/nullptr); | |||
4726 | if (CtorArg.isInvalid()) | |||
4727 | return true; | |||
4728 | ||||
4729 | // C++11 [class.copy]p15: | |||
4730 | // - if a member m has rvalue reference type T&&, it is direct-initialized | |||
4731 | // with static_cast<T&&>(x.m); | |||
4732 | if (RefersToRValueRef(CtorArg.get())) { | |||
4733 | CtorArg = CastForMoving(SemaRef, CtorArg.get()); | |||
4734 | } | |||
4735 | ||||
4736 | InitializedEntity Entity = | |||
4737 | Indirect ? InitializedEntity::InitializeMember(Indirect, nullptr, | |||
4738 | /*Implicit*/ true) | |||
4739 | : InitializedEntity::InitializeMember(Field, nullptr, | |||
4740 | /*Implicit*/ true); | |||
4741 | ||||
4742 | // Direct-initialize to use the copy constructor. | |||
4743 | InitializationKind InitKind = | |||
4744 | InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); | |||
4745 | ||||
4746 | Expr *CtorArgE = CtorArg.getAs<Expr>(); | |||
4747 | InitializationSequence InitSeq(SemaRef, Entity, InitKind, CtorArgE); | |||
4748 | ExprResult MemberInit = | |||
4749 | InitSeq.Perform(SemaRef, Entity, InitKind, MultiExprArg(&CtorArgE, 1)); | |||
4750 | MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); | |||
4751 | if (MemberInit.isInvalid()) | |||
4752 | return true; | |||
4753 | ||||
4754 | if (Indirect) | |||
4755 | CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer( | |||
4756 | SemaRef.Context, Indirect, Loc, Loc, MemberInit.getAs<Expr>(), Loc); | |||
4757 | else | |||
4758 | CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer( | |||
4759 | SemaRef.Context, Field, Loc, Loc, MemberInit.getAs<Expr>(), Loc); | |||
4760 | return false; | |||
4761 | } | |||
4762 | ||||
4763 | assert((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) &&(((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit ) && "Unhandled implicit init kind!") ? static_cast< void> (0) : __assert_fail ("(ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) && \"Unhandled implicit init kind!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 4764, __PRETTY_FUNCTION__)) | |||
4764 | "Unhandled implicit init kind!")(((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit ) && "Unhandled implicit init kind!") ? static_cast< void> (0) : __assert_fail ("(ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) && \"Unhandled implicit init kind!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 4764, __PRETTY_FUNCTION__)); | |||
4765 | ||||
4766 | QualType FieldBaseElementType = | |||
4767 | SemaRef.Context.getBaseElementType(Field->getType()); | |||
4768 | ||||
4769 | if (FieldBaseElementType->isRecordType()) { | |||
4770 | InitializedEntity InitEntity = | |||
4771 | Indirect ? InitializedEntity::InitializeMember(Indirect, nullptr, | |||
4772 | /*Implicit*/ true) | |||
4773 | : InitializedEntity::InitializeMember(Field, nullptr, | |||
4774 | /*Implicit*/ true); | |||
4775 | InitializationKind InitKind = | |||
4776 | InitializationKind::CreateDefault(Loc); | |||
4777 | ||||
4778 | InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); | |||
4779 | ExprResult MemberInit = | |||
4780 | InitSeq.Perform(SemaRef, InitEntity, InitKind, None); | |||
4781 | ||||
4782 | MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); | |||
4783 | if (MemberInit.isInvalid()) | |||
4784 | return true; | |||
4785 | ||||
4786 | if (Indirect) | |||
4787 | CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, | |||
4788 | Indirect, Loc, | |||
4789 | Loc, | |||
4790 | MemberInit.get(), | |||
4791 | Loc); | |||
4792 | else | |||
4793 | CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, | |||
4794 | Field, Loc, Loc, | |||
4795 | MemberInit.get(), | |||
4796 | Loc); | |||
4797 | return false; | |||
4798 | } | |||
4799 | ||||
4800 | if (!Field->getParent()->isUnion()) { | |||
4801 | if (FieldBaseElementType->isReferenceType()) { | |||
4802 | SemaRef.Diag(Constructor->getLocation(), | |||
4803 | diag::err_uninitialized_member_in_ctor) | |||
4804 | << (int)Constructor->isImplicit() | |||
4805 | << SemaRef.Context.getTagDeclType(Constructor->getParent()) | |||
4806 | << 0 << Field->getDeclName(); | |||
4807 | SemaRef.Diag(Field->getLocation(), diag::note_declared_at); | |||
4808 | return true; | |||
4809 | } | |||
4810 | ||||
4811 | if (FieldBaseElementType.isConstQualified()) { | |||
4812 | SemaRef.Diag(Constructor->getLocation(), | |||
4813 | diag::err_uninitialized_member_in_ctor) | |||
4814 | << (int)Constructor->isImplicit() | |||
4815 | << SemaRef.Context.getTagDeclType(Constructor->getParent()) | |||
4816 | << 1 << Field->getDeclName(); | |||
4817 | SemaRef.Diag(Field->getLocation(), diag::note_declared_at); | |||
4818 | return true; | |||
4819 | } | |||
4820 | } | |||
4821 | ||||
4822 | if (FieldBaseElementType.hasNonTrivialObjCLifetime()) { | |||
4823 | // ARC and Weak: | |||
4824 | // Default-initialize Objective-C pointers to NULL. | |||
4825 | CXXMemberInit | |||
4826 | = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, | |||
4827 | Loc, Loc, | |||
4828 | new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), | |||
4829 | Loc); | |||
4830 | return false; | |||
4831 | } | |||
4832 | ||||
4833 | // Nothing to initialize. | |||
4834 | CXXMemberInit = nullptr; | |||
4835 | return false; | |||
4836 | } | |||
4837 | ||||
4838 | namespace { | |||
4839 | struct BaseAndFieldInfo { | |||
4840 | Sema &S; | |||
4841 | CXXConstructorDecl *Ctor; | |||
4842 | bool AnyErrorsInInits; | |||
4843 | ImplicitInitializerKind IIK; | |||
4844 | llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; | |||
4845 | SmallVector<CXXCtorInitializer*, 8> AllToInit; | |||
4846 | llvm::DenseMap<TagDecl*, FieldDecl*> ActiveUnionMember; | |||
4847 | ||||
4848 | BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) | |||
4849 | : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { | |||
4850 | bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); | |||
4851 | if (Ctor->getInheritedConstructor()) | |||
4852 | IIK = IIK_Inherit; | |||
4853 | else if (Generated && Ctor->isCopyConstructor()) | |||
4854 | IIK = IIK_Copy; | |||
4855 | else if (Generated && Ctor->isMoveConstructor()) | |||
4856 | IIK = IIK_Move; | |||
4857 | else | |||
4858 | IIK = IIK_Default; | |||
4859 | } | |||
4860 | ||||
4861 | bool isImplicitCopyOrMove() const { | |||
4862 | switch (IIK) { | |||
4863 | case IIK_Copy: | |||
4864 | case IIK_Move: | |||
4865 | return true; | |||
4866 | ||||
4867 | case IIK_Default: | |||
4868 | case IIK_Inherit: | |||
4869 | return false; | |||
4870 | } | |||
4871 | ||||
4872 | llvm_unreachable("Invalid ImplicitInitializerKind!")::llvm::llvm_unreachable_internal("Invalid ImplicitInitializerKind!" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 4872); | |||
4873 | } | |||
4874 | ||||
4875 | bool addFieldInitializer(CXXCtorInitializer *Init) { | |||
4876 | AllToInit.push_back(Init); | |||
4877 | ||||
4878 | // Check whether this initializer makes the field "used". | |||
4879 | if (Init->getInit()->HasSideEffects(S.Context)) | |||
4880 | S.UnusedPrivateFields.remove(Init->getAnyMember()); | |||
4881 | ||||
4882 | return false; | |||
4883 | } | |||
4884 | ||||
4885 | bool isInactiveUnionMember(FieldDecl *Field) { | |||
4886 | RecordDecl *Record = Field->getParent(); | |||
4887 | if (!Record->isUnion()) | |||
4888 | return false; | |||
4889 | ||||
4890 | if (FieldDecl *Active = | |||
4891 | ActiveUnionMember.lookup(Record->getCanonicalDecl())) | |||
4892 | return Active != Field->getCanonicalDecl(); | |||
4893 | ||||
4894 | // In an implicit copy or move constructor, ignore any in-class initializer. | |||
4895 | if (isImplicitCopyOrMove()) | |||
4896 | return true; | |||
4897 | ||||
4898 | // If there's no explicit initialization, the field is active only if it | |||
4899 | // has an in-class initializer... | |||
4900 | if (Field->hasInClassInitializer()) | |||
4901 | return false; | |||
4902 | // ... or it's an anonymous struct or union whose class has an in-class | |||
4903 | // initializer. | |||
4904 | if (!Field->isAnonymousStructOrUnion()) | |||
4905 | return true; | |||
4906 | CXXRecordDecl *FieldRD = Field->getType()->getAsCXXRecordDecl(); | |||
4907 | return !FieldRD->hasInClassInitializer(); | |||
4908 | } | |||
4909 | ||||
4910 | /// Determine whether the given field is, or is within, a union member | |||
4911 | /// that is inactive (because there was an initializer given for a different | |||
4912 | /// member of the union, or because the union was not initialized at all). | |||
4913 | bool isWithinInactiveUnionMember(FieldDecl *Field, | |||
4914 | IndirectFieldDecl *Indirect) { | |||
4915 | if (!Indirect) | |||
4916 | return isInactiveUnionMember(Field); | |||
4917 | ||||
4918 | for (auto *C : Indirect->chain()) { | |||
4919 | FieldDecl *Field = dyn_cast<FieldDecl>(C); | |||
4920 | if (Field && isInactiveUnionMember(Field)) | |||
4921 | return true; | |||
4922 | } | |||
4923 | return false; | |||
4924 | } | |||
4925 | }; | |||
4926 | } | |||
4927 | ||||
4928 | /// Determine whether the given type is an incomplete or zero-lenfgth | |||
4929 | /// array type. | |||
4930 | static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { | |||
4931 | if (T->isIncompleteArrayType()) | |||
4932 | return true; | |||
4933 | ||||
4934 | while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { | |||
4935 | if (!ArrayT->getSize()) | |||
4936 | return true; | |||
4937 | ||||
4938 | T = ArrayT->getElementType(); | |||
4939 | } | |||
4940 | ||||
4941 | return false; | |||
4942 | } | |||
4943 | ||||
4944 | static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, | |||
4945 | FieldDecl *Field, | |||
4946 | IndirectFieldDecl *Indirect = nullptr) { | |||
4947 | if (Field->isInvalidDecl()) | |||
4948 | return false; | |||
4949 | ||||
4950 | // Overwhelmingly common case: we have a direct initializer for this field. | |||
4951 | if (CXXCtorInitializer *Init = | |||
4952 | Info.AllBaseFields.lookup(Field->getCanonicalDecl())) | |||
4953 | return Info.addFieldInitializer(Init); | |||
4954 | ||||
4955 | // C++11 [class.base.init]p8: | |||
4956 | // if the entity is a non-static data member that has a | |||
4957 | // brace-or-equal-initializer and either | |||
4958 | // -- the constructor's class is a union and no other variant member of that | |||
4959 | // union is designated by a mem-initializer-id or | |||
4960 | // -- the constructor's class is not a union, and, if the entity is a member | |||
4961 | // of an anonymous union, no other member of that union is designated by | |||
4962 | // a mem-initializer-id, | |||
4963 | // the entity is initialized as specified in [dcl.init]. | |||
4964 | // | |||
4965 | // We also apply the same rules to handle anonymous structs within anonymous | |||
4966 | // unions. | |||
4967 | if (Info.isWithinInactiveUnionMember(Field, Indirect)) | |||
4968 | return false; | |||
4969 | ||||
4970 | if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { | |||
4971 | ExprResult DIE = | |||
4972 | SemaRef.BuildCXXDefaultInitExpr(Info.Ctor->getLocation(), Field); | |||
4973 | if (DIE.isInvalid()) | |||
4974 | return true; | |||
4975 | ||||
4976 | auto Entity = InitializedEntity::InitializeMember(Field, nullptr, true); | |||
4977 | SemaRef.checkInitializerLifetime(Entity, DIE.get()); | |||
4978 | ||||
4979 | CXXCtorInitializer *Init; | |||
4980 | if (Indirect) | |||
4981 | Init = new (SemaRef.Context) | |||
4982 | CXXCtorInitializer(SemaRef.Context, Indirect, SourceLocation(), | |||
4983 | SourceLocation(), DIE.get(), SourceLocation()); | |||
4984 | else | |||
4985 | Init = new (SemaRef.Context) | |||
4986 | CXXCtorInitializer(SemaRef.Context, Field, SourceLocation(), | |||
4987 | SourceLocation(), DIE.get(), SourceLocation()); | |||
4988 | return Info.addFieldInitializer(Init); | |||
4989 | } | |||
4990 | ||||
4991 | // Don't initialize incomplete or zero-length arrays. | |||
4992 | if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) | |||
4993 | return false; | |||
4994 | ||||
4995 | // Don't try to build an implicit initializer if there were semantic | |||
4996 | // errors in any of the initializers (and therefore we might be | |||
4997 | // missing some that the user actually wrote). | |||
4998 | if (Info.AnyErrorsInInits) | |||
4999 | return false; | |||
5000 | ||||
5001 | CXXCtorInitializer *Init = nullptr; | |||
5002 | if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, | |||
5003 | Indirect, Init)) | |||
5004 | return true; | |||
5005 | ||||
5006 | if (!Init) | |||
5007 | return false; | |||
5008 | ||||
5009 | return Info.addFieldInitializer(Init); | |||
5010 | } | |||
5011 | ||||
5012 | bool | |||
5013 | Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, | |||
5014 | CXXCtorInitializer *Initializer) { | |||
5015 | assert(Initializer->isDelegatingInitializer())((Initializer->isDelegatingInitializer()) ? static_cast< void> (0) : __assert_fail ("Initializer->isDelegatingInitializer()" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 5015, __PRETTY_FUNCTION__)); | |||
5016 | Constructor->setNumCtorInitializers(1); | |||
5017 | CXXCtorInitializer **initializer = | |||
5018 | new (Context) CXXCtorInitializer*[1]; | |||
5019 | memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); | |||
5020 | Constructor->setCtorInitializers(initializer); | |||
5021 | ||||
5022 | if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { | |||
5023 | MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); | |||
5024 | DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); | |||
5025 | } | |||
5026 | ||||
5027 | DelegatingCtorDecls.push_back(Constructor); | |||
5028 | ||||
5029 | DiagnoseUninitializedFields(*this, Constructor); | |||
5030 | ||||
5031 | return false; | |||
5032 | } | |||
5033 | ||||
5034 | bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors, | |||
5035 | ArrayRef<CXXCtorInitializer *> Initializers) { | |||
5036 | if (Constructor->isDependentContext()) { | |||
5037 | // Just store the initializers as written, they will be checked during | |||
5038 | // instantiation. | |||
5039 | if (!Initializers.empty()) { | |||
5040 | Constructor->setNumCtorInitializers(Initializers.size()); | |||
5041 | CXXCtorInitializer **baseOrMemberInitializers = | |||
5042 | new (Context) CXXCtorInitializer*[Initializers.size()]; | |||
5043 | memcpy(baseOrMemberInitializers, Initializers.data(), | |||
5044 | Initializers.size() * sizeof(CXXCtorInitializer*)); | |||
5045 | Constructor->setCtorInitializers(baseOrMemberInitializers); | |||
5046 | } | |||
5047 | ||||
5048 | // Let template instantiation know whether we had errors. | |||
5049 | if (AnyErrors) | |||
5050 | Constructor->setInvalidDecl(); | |||
5051 | ||||
5052 | return false; | |||
5053 | } | |||
5054 | ||||
5055 | BaseAndFieldInfo Info(*this, Constructor, AnyErrors); | |||
5056 | ||||
5057 | // We need to build the initializer AST according to order of construction | |||
5058 | // and not what user specified in the Initializers list. | |||
5059 | CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); | |||
5060 | if (!ClassDecl) | |||
5061 | return true; | |||
5062 | ||||
5063 | bool HadError = false; | |||
5064 | ||||
5065 | for (unsigned i = 0; i < Initializers.size(); i++) { | |||
5066 | CXXCtorInitializer *Member = Initializers[i]; | |||
5067 | ||||
5068 | if (Member->isBaseInitializer()) | |||
5069 | Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; | |||
5070 | else { | |||
5071 | Info.AllBaseFields[Member->getAnyMember()->getCanonicalDecl()] = Member; | |||
5072 | ||||
5073 | if (IndirectFieldDecl *F = Member->getIndirectMember()) { | |||
5074 | for (auto *C : F->chain()) { | |||
5075 | FieldDecl *FD = dyn_cast<FieldDecl>(C); | |||
5076 | if (FD && FD->getParent()->isUnion()) | |||
5077 | Info.ActiveUnionMember.insert(std::make_pair( | |||
5078 | FD->getParent()->getCanonicalDecl(), FD->getCanonicalDecl())); | |||
5079 | } | |||
5080 | } else if (FieldDecl *FD = Member->getMember()) { | |||
5081 | if (FD->getParent()->isUnion()) | |||
5082 | Info.ActiveUnionMember.insert(std::make_pair( | |||
5083 | FD->getParent()->getCanonicalDecl(), FD->getCanonicalDecl())); | |||
5084 | } | |||
5085 | } | |||
5086 | } | |||
5087 | ||||
5088 | // Keep track of the direct virtual bases. | |||
5089 | llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; | |||
5090 | for (auto &I : ClassDecl->bases()) { | |||
5091 | if (I.isVirtual()) | |||
5092 | DirectVBases.insert(&I); | |||
5093 | } | |||
5094 | ||||
5095 | // Push virtual bases before others. | |||
5096 | for (auto &VBase : ClassDecl->vbases()) { | |||
5097 | if (CXXCtorInitializer *Value | |||
5098 | = Info.AllBaseFields.lookup(VBase.getType()->getAs<RecordType>())) { | |||
5099 | // [class.base.init]p7, per DR257: | |||
5100 | // A mem-initializer where the mem-initializer-id names a virtual base | |||
5101 | // class is ignored during execution of a constructor of any class that | |||
5102 | // is not the most derived class. | |||
5103 | if (ClassDecl->isAbstract()) { | |||
5104 | // FIXME: Provide a fixit to remove the base specifier. This requires | |||
5105 | // tracking the location of the associated comma for a base specifier. | |||
5106 | Diag(Value->getSourceLocation(), diag::warn_abstract_vbase_init_ignored) | |||
5107 | << VBase.getType() << ClassDecl; | |||
5108 | DiagnoseAbstractType(ClassDecl); | |||
5109 | } | |||
5110 | ||||
5111 | Info.AllToInit.push_back(Value); | |||
5112 | } else if (!AnyErrors && !ClassDecl->isAbstract()) { | |||
5113 | // [class.base.init]p8, per DR257: | |||
5114 | // If a given [...] base class is not named by a mem-initializer-id | |||
5115 | // [...] and the entity is not a virtual base class of an abstract | |||
5116 | // class, then [...] the entity is default-initialized. | |||
5117 | bool IsInheritedVirtualBase = !DirectVBases.count(&VBase); | |||
5118 | CXXCtorInitializer *CXXBaseInit; | |||
5119 | if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, | |||
5120 | &VBase, IsInheritedVirtualBase, | |||
5121 | CXXBaseInit)) { | |||
5122 | HadError = true; | |||
5123 | continue; | |||
5124 | } | |||
5125 | ||||
5126 | Info.AllToInit.push_back(CXXBaseInit); | |||
5127 | } | |||
5128 | } | |||
5129 | ||||
5130 | // Non-virtual bases. | |||
5131 | for (auto &Base : ClassDecl->bases()) { | |||
5132 | // Virtuals are in the virtual base list and already constructed. | |||
5133 | if (Base.isVirtual()) | |||
5134 | continue; | |||
5135 | ||||
5136 | if (CXXCtorInitializer *Value | |||
5137 | = Info.AllBaseFields.lookup(Base.getType()->getAs<RecordType>())) { | |||
5138 | Info.AllToInit.push_back(Value); | |||
5139 | } else if (!AnyErrors) { | |||
5140 | CXXCtorInitializer *CXXBaseInit; | |||
5141 | if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, | |||
5142 | &Base, /*IsInheritedVirtualBase=*/false, | |||
5143 | CXXBaseInit)) { | |||
5144 | HadError = true; | |||
5145 | continue; | |||
5146 | } | |||
5147 | ||||
5148 | Info.AllToInit.push_back(CXXBaseInit); | |||
5149 | } | |||
5150 | } | |||
5151 | ||||
5152 | // Fields. | |||
5153 | for (auto *Mem : ClassDecl->decls()) { | |||
5154 | if (auto *F = dyn_cast<FieldDecl>(Mem)) { | |||
5155 | // C++ [class.bit]p2: | |||
5156 | // A declaration for a bit-field that omits the identifier declares an | |||
5157 | // unnamed bit-field. Unnamed bit-fields are not members and cannot be | |||
5158 | // initialized. | |||
5159 | if (F->isUnnamedBitfield()) | |||
5160 | continue; | |||
5161 | ||||
5162 | // If we're not generating the implicit copy/move constructor, then we'll | |||
5163 | // handle anonymous struct/union fields based on their individual | |||
5164 | // indirect fields. | |||
5165 | if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove()) | |||
5166 | continue; | |||
5167 | ||||
5168 | if (CollectFieldInitializer(*this, Info, F)) | |||
5169 | HadError = true; | |||
5170 | continue; | |||
5171 | } | |||
5172 | ||||
5173 | // Beyond this point, we only consider default initialization. | |||
5174 | if (Info.isImplicitCopyOrMove()) | |||
5175 | continue; | |||
5176 | ||||
5177 | if (auto *F = dyn_cast<IndirectFieldDecl>(Mem)) { | |||
5178 | if (F->getType()->isIncompleteArrayType()) { | |||
5179 | assert(ClassDecl->hasFlexibleArrayMember() &&((ClassDecl->hasFlexibleArrayMember() && "Incomplete array type is not valid" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl->hasFlexibleArrayMember() && \"Incomplete array type is not valid\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 5180, __PRETTY_FUNCTION__)) | |||
5180 | "Incomplete array type is not valid")((ClassDecl->hasFlexibleArrayMember() && "Incomplete array type is not valid" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl->hasFlexibleArrayMember() && \"Incomplete array type is not valid\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 5180, __PRETTY_FUNCTION__)); | |||
5181 | continue; | |||
5182 | } | |||
5183 | ||||
5184 | // Initialize each field of an anonymous struct individually. | |||
5185 | if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) | |||
5186 | HadError = true; | |||
5187 | ||||
5188 | continue; | |||
5189 | } | |||
5190 | } | |||
5191 | ||||
5192 | unsigned NumInitializers = Info.AllToInit.size(); | |||
5193 | if (NumInitializers > 0) { | |||
5194 | Constructor->setNumCtorInitializers(NumInitializers); | |||
5195 | CXXCtorInitializer **baseOrMemberInitializers = | |||
5196 | new (Context) CXXCtorInitializer*[NumInitializers]; | |||
5197 | memcpy(baseOrMemberInitializers, Info.AllToInit.data(), | |||
5198 | NumInitializers * sizeof(CXXCtorInitializer*)); | |||
5199 | Constructor->setCtorInitializers(baseOrMemberInitializers); | |||
5200 | ||||
5201 | // Constructors implicitly reference the base and member | |||
5202 | // destructors. | |||
5203 | MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), | |||
5204 | Constructor->getParent()); | |||
5205 | } | |||
5206 | ||||
5207 | return HadError; | |||
5208 | } | |||
5209 | ||||
5210 | static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) { | |||
5211 | if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { | |||
5212 | const RecordDecl *RD = RT->getDecl(); | |||
5213 | if (RD->isAnonymousStructOrUnion()) { | |||
5214 | for (auto *Field : RD->fields()) | |||
5215 | PopulateKeysForFields(Field, IdealInits); | |||
5216 | return; | |||
5217 | } | |||
5218 | } | |||
5219 | IdealInits.push_back(Field->getCanonicalDecl()); | |||
5220 | } | |||
5221 | ||||
5222 | static const void *GetKeyForBase(ASTContext &Context, QualType BaseType) { | |||
5223 | return Context.getCanonicalType(BaseType).getTypePtr(); | |||
5224 | } | |||
5225 | ||||
5226 | static const void *GetKeyForMember(ASTContext &Context, | |||
5227 | CXXCtorInitializer *Member) { | |||
5228 | if (!Member->isAnyMemberInitializer()) | |||
5229 | return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); | |||
5230 | ||||
5231 | return Member->getAnyMember()->getCanonicalDecl(); | |||
5232 | } | |||
5233 | ||||
5234 | static void DiagnoseBaseOrMemInitializerOrder( | |||
5235 | Sema &SemaRef, const CXXConstructorDecl *Constructor, | |||
5236 | ArrayRef<CXXCtorInitializer *> Inits) { | |||
5237 | if (Constructor->getDeclContext()->isDependentContext()) | |||
5238 | return; | |||
5239 | ||||
5240 | // Don't check initializers order unless the warning is enabled at the | |||
5241 | // location of at least one initializer. | |||
5242 | bool ShouldCheckOrder = false; | |||
5243 | for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { | |||
5244 | CXXCtorInitializer *Init = Inits[InitIndex]; | |||
5245 | if (!SemaRef.Diags.isIgnored(diag::warn_initializer_out_of_order, | |||
5246 | Init->getSourceLocation())) { | |||
5247 | ShouldCheckOrder = true; | |||
5248 | break; | |||
5249 | } | |||
5250 | } | |||
5251 | if (!ShouldCheckOrder) | |||
5252 | return; | |||
5253 | ||||
5254 | // Build the list of bases and members in the order that they'll | |||
5255 | // actually be initialized. The explicit initializers should be in | |||
5256 | // this same order but may be missing things. | |||
5257 | SmallVector<const void*, 32> IdealInitKeys; | |||
5258 | ||||
5259 | const CXXRecordDecl *ClassDecl = Constructor->getParent(); | |||
5260 | ||||
5261 | // 1. Virtual bases. | |||
5262 | for (const auto &VBase : ClassDecl->vbases()) | |||
5263 | IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase.getType())); | |||
5264 | ||||
5265 | // 2. Non-virtual bases. | |||
5266 | for (const auto &Base : ClassDecl->bases()) { | |||
5267 | if (Base.isVirtual()) | |||
5268 | continue; | |||
5269 | IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base.getType())); | |||
5270 | } | |||
5271 | ||||
5272 | // 3. Direct fields. | |||
5273 | for (auto *Field : ClassDecl->fields()) { | |||
5274 | if (Field->isUnnamedBitfield()) | |||
5275 | continue; | |||
5276 | ||||
5277 | PopulateKeysForFields(Field, IdealInitKeys); | |||
5278 | } | |||
5279 | ||||
5280 | unsigned NumIdealInits = IdealInitKeys.size(); | |||
5281 | unsigned IdealIndex = 0; | |||
5282 | ||||
5283 | CXXCtorInitializer *PrevInit = nullptr; | |||
5284 | for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { | |||
5285 | CXXCtorInitializer *Init = Inits[InitIndex]; | |||
5286 | const void *InitKey = GetKeyForMember(SemaRef.Context, Init); | |||
5287 | ||||
5288 | // Scan forward to try to find this initializer in the idealized | |||
5289 | // initializers list. | |||
5290 | for (; IdealIndex != NumIdealInits; ++IdealIndex) | |||
5291 | if (InitKey == IdealInitKeys[IdealIndex]) | |||
5292 | break; | |||
5293 | ||||
5294 | // If we didn't find this initializer, it must be because we | |||
5295 | // scanned past it on a previous iteration. That can only | |||
5296 | // happen if we're out of order; emit a warning. | |||
5297 | if (IdealIndex == NumIdealInits && PrevInit) { | |||
5298 | Sema::SemaDiagnosticBuilder D = | |||
5299 | SemaRef.Diag(PrevInit->getSourceLocation(), | |||
5300 | diag::warn_initializer_out_of_order); | |||
5301 | ||||
5302 | if (PrevInit->isAnyMemberInitializer()) | |||
5303 | D << 0 << PrevInit->getAnyMember()->getDeclName(); | |||
5304 | else | |||
5305 | D << 1 << PrevInit->getTypeSourceInfo()->getType(); | |||
5306 | ||||
5307 | if (Init->isAnyMemberInitializer()) | |||
5308 | D << 0 << Init->getAnyMember()->getDeclName(); | |||
5309 | else | |||
5310 | D << 1 << Init->getTypeSourceInfo()->getType(); | |||
5311 | ||||
5312 | // Move back to the initializer's location in the ideal list. | |||
5313 | for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) | |||
5314 | if (InitKey == IdealInitKeys[IdealIndex]) | |||
5315 | break; | |||
5316 | ||||
5317 | assert(IdealIndex < NumIdealInits &&((IdealIndex < NumIdealInits && "initializer not found in initializer list" ) ? static_cast<void> (0) : __assert_fail ("IdealIndex < NumIdealInits && \"initializer not found in initializer list\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 5318, __PRETTY_FUNCTION__)) | |||
5318 | "initializer not found in initializer list")((IdealIndex < NumIdealInits && "initializer not found in initializer list" ) ? static_cast<void> (0) : __assert_fail ("IdealIndex < NumIdealInits && \"initializer not found in initializer list\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 5318, __PRETTY_FUNCTION__)); | |||
5319 | } | |||
5320 | ||||
5321 | PrevInit = Init; | |||
5322 | } | |||
5323 | } | |||
5324 | ||||
5325 | namespace { | |||
5326 | bool CheckRedundantInit(Sema &S, | |||
5327 | CXXCtorInitializer *Init, | |||
5328 | CXXCtorInitializer *&PrevInit) { | |||
5329 | if (!PrevInit) { | |||
5330 | PrevInit = Init; | |||
5331 | return false; | |||
5332 | } | |||
5333 | ||||
5334 | if (FieldDecl *Field = Init->getAnyMember()) | |||
5335 | S.Diag(Init->getSourceLocation(), | |||
5336 | diag::err_multiple_mem_initialization) | |||
5337 | << Field->getDeclName() | |||
5338 | << Init->getSourceRange(); | |||
5339 | else { | |||
5340 | const Type *BaseClass = Init->getBaseClass(); | |||
5341 | assert(BaseClass && "neither field nor base")((BaseClass && "neither field nor base") ? static_cast <void> (0) : __assert_fail ("BaseClass && \"neither field nor base\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 5341, __PRETTY_FUNCTION__)); | |||
5342 | S.Diag(Init->getSourceLocation(), | |||
5343 | diag::err_multiple_base_initialization) | |||
5344 | << QualType(BaseClass, 0) | |||
5345 | << Init->getSourceRange(); | |||
5346 | } | |||
5347 | S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) | |||
5348 | << 0 << PrevInit->getSourceRange(); | |||
5349 | ||||
5350 | return true; | |||
5351 | } | |||
5352 | ||||
5353 | typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; | |||
5354 | typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; | |||
5355 | ||||
5356 | bool CheckRedundantUnionInit(Sema &S, | |||
5357 | CXXCtorInitializer *Init, | |||
5358 | RedundantUnionMap &Unions) { | |||
5359 | FieldDecl *Field = Init->getAnyMember(); | |||
5360 | RecordDecl *Parent = Field->getParent(); | |||
5361 | NamedDecl *Child = Field; | |||
5362 | ||||
5363 | while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { | |||
5364 | if (Parent->isUnion()) { | |||
5365 | UnionEntry &En = Unions[Parent]; | |||
5366 | if (En.first && En.first != Child) { | |||
5367 | S.Diag(Init->getSourceLocation(), | |||
5368 | diag::err_multiple_mem_union_initialization) | |||
5369 | << Field->getDeclName() | |||
5370 | << Init->getSourceRange(); | |||
5371 | S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) | |||
5372 | << 0 << En.second->getSourceRange(); | |||
5373 | return true; | |||
5374 | } | |||
5375 | if (!En.first) { | |||
5376 | En.first = Child; | |||
5377 | En.second = Init; | |||
5378 | } | |||
5379 | if (!Parent->isAnonymousStructOrUnion()) | |||
5380 | return false; | |||
5381 | } | |||
5382 | ||||
5383 | Child = Parent; | |||
5384 | Parent = cast<RecordDecl>(Parent->getDeclContext()); | |||
5385 | } | |||
5386 | ||||
5387 | return false; | |||
5388 | } | |||
5389 | } | |||
5390 | ||||
5391 | /// ActOnMemInitializers - Handle the member initializers for a constructor. | |||
5392 | void Sema::ActOnMemInitializers(Decl *ConstructorDecl, | |||
5393 | SourceLocation ColonLoc, | |||
5394 | ArrayRef<CXXCtorInitializer*> MemInits, | |||
5395 | bool AnyErrors) { | |||
5396 | if (!ConstructorDecl) | |||
5397 | return; | |||
5398 | ||||
5399 | AdjustDeclIfTemplate(ConstructorDecl); | |||
5400 | ||||
5401 | CXXConstructorDecl *Constructor | |||
5402 | = dyn_cast<CXXConstructorDecl>(ConstructorDecl); | |||
5403 | ||||
5404 | if (!Constructor) { | |||
5405 | Diag(ColonLoc, diag::err_only_constructors_take_base_inits); | |||
5406 | return; | |||
5407 | } | |||
5408 | ||||
5409 | // Mapping for the duplicate initializers check. | |||
5410 | // For member initializers, this is keyed with a FieldDecl*. | |||
5411 | // For base initializers, this is keyed with a Type*. | |||
5412 | llvm::DenseMap<const void *, CXXCtorInitializer *> Members; | |||
5413 | ||||
5414 | // Mapping for the inconsistent anonymous-union initializers check. | |||
5415 | RedundantUnionMap MemberUnions; | |||
5416 | ||||
5417 | bool HadError = false; | |||
5418 | for (unsigned i = 0; i < MemInits.size(); i++) { | |||
5419 | CXXCtorInitializer *Init = MemInits[i]; | |||
5420 | ||||
5421 | // Set the source order index. | |||
5422 | Init->setSourceOrder(i); | |||
5423 | ||||
5424 | if (Init->isAnyMemberInitializer()) { | |||
5425 | const void *Key = GetKeyForMember(Context, Init); | |||
5426 | if (CheckRedundantInit(*this, Init, Members[Key]) || | |||
5427 | CheckRedundantUnionInit(*this, Init, MemberUnions)) | |||
5428 | HadError = true; | |||
5429 | } else if (Init->isBaseInitializer()) { | |||
5430 | const void *Key = GetKeyForMember(Context, Init); | |||
5431 | if (CheckRedundantInit(*this, Init, Members[Key])) | |||
5432 | HadError = true; | |||
5433 | } else { | |||
5434 | assert(Init->isDelegatingInitializer())((Init->isDelegatingInitializer()) ? static_cast<void> (0) : __assert_fail ("Init->isDelegatingInitializer()", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 5434, __PRETTY_FUNCTION__)); | |||
5435 | // This must be the only initializer | |||
5436 | if (MemInits.size() != 1) { | |||
5437 | Diag(Init->getSourceLocation(), | |||
5438 | diag::err_delegating_initializer_alone) | |||
5439 | << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); | |||
5440 | // We will treat this as being the only initializer. | |||
5441 | } | |||
5442 | SetDelegatingInitializer(Constructor, MemInits[i]); | |||
5443 | // Return immediately as the initializer is set. | |||
5444 | return; | |||
5445 | } | |||
5446 | } | |||
5447 | ||||
5448 | if (HadError) | |||
5449 | return; | |||
5450 | ||||
5451 | DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits); | |||
5452 | ||||
5453 | SetCtorInitializers(Constructor, AnyErrors, MemInits); | |||
5454 | ||||
5455 | DiagnoseUninitializedFields(*this, Constructor); | |||
5456 | } | |||
5457 | ||||
5458 | void | |||
5459 | Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, | |||
5460 | CXXRecordDecl *ClassDecl) { | |||
5461 | // Ignore dependent contexts. Also ignore unions, since their members never | |||
5462 | // have destructors implicitly called. | |||
5463 | if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) | |||
5464 | return; | |||
5465 | ||||
5466 | // FIXME: all the access-control diagnostics are positioned on the | |||
5467 | // field/base declaration. That's probably good; that said, the | |||
5468 | // user might reasonably want to know why the destructor is being | |||
5469 | // emitted, and we currently don't say. | |||
5470 | ||||
5471 | // Non-static data members. | |||
5472 | for (auto *Field : ClassDecl->fields()) { | |||
5473 | if (Field->isInvalidDecl()) | |||
5474 | continue; | |||
5475 | ||||
5476 | // Don't destroy incomplete or zero-length arrays. | |||
5477 | if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) | |||
5478 | continue; | |||
5479 | ||||
5480 | QualType FieldType = Context.getBaseElementType(Field->getType()); | |||
5481 | ||||
5482 | const RecordType* RT = FieldType->getAs<RecordType>(); | |||
5483 | if (!RT) | |||
5484 | continue; | |||
5485 | ||||
5486 | CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); | |||
5487 | if (FieldClassDecl->isInvalidDecl()) | |||
5488 | continue; | |||
5489 | if (FieldClassDecl->hasIrrelevantDestructor()) | |||
5490 | continue; | |||
5491 | // The destructor for an implicit anonymous union member is never invoked. | |||
5492 | if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) | |||
5493 | continue; | |||
5494 | ||||
5495 | CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); | |||
5496 | assert(Dtor && "No dtor found for FieldClassDecl!")((Dtor && "No dtor found for FieldClassDecl!") ? static_cast <void> (0) : __assert_fail ("Dtor && \"No dtor found for FieldClassDecl!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 5496, __PRETTY_FUNCTION__)); | |||
5497 | CheckDestructorAccess(Field->getLocation(), Dtor, | |||
5498 | PDiag(diag::err_access_dtor_field) | |||
5499 | << Field->getDeclName() | |||
5500 | << FieldType); | |||
5501 | ||||
5502 | MarkFunctionReferenced(Location, Dtor); | |||
5503 | DiagnoseUseOfDecl(Dtor, Location); | |||
5504 | } | |||
5505 | ||||
5506 | // We only potentially invoke the destructors of potentially constructed | |||
5507 | // subobjects. | |||
5508 | bool VisitVirtualBases = !ClassDecl->isAbstract(); | |||
5509 | ||||
5510 | // If the destructor exists and has already been marked used in the MS ABI, | |||
5511 | // then virtual base destructors have already been checked and marked used. | |||
5512 | // Skip checking them again to avoid duplicate diagnostics. | |||
5513 | if (Context.getTargetInfo().getCXXABI().isMicrosoft()) { | |||
5514 | CXXDestructorDecl *Dtor = ClassDecl->getDestructor(); | |||
5515 | if (Dtor && Dtor->isUsed()) | |||
5516 | VisitVirtualBases = false; | |||
5517 | } | |||
5518 | ||||
5519 | llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; | |||
5520 | ||||
5521 | // Bases. | |||
5522 | for (const auto &Base : ClassDecl->bases()) { | |||
5523 | // Bases are always records in a well-formed non-dependent class. | |||
5524 | const RecordType *RT = Base.getType()->getAs<RecordType>(); | |||
5525 | ||||
5526 | // Remember direct virtual bases. | |||
5527 | if (Base.isVirtual()) { | |||
5528 | if (!VisitVirtualBases) | |||
5529 | continue; | |||
5530 | DirectVirtualBases.insert(RT); | |||
5531 | } | |||
5532 | ||||
5533 | CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); | |||
| ||||
5534 | // If our base class is invalid, we probably can't get its dtor anyway. | |||
5535 | if (BaseClassDecl->isInvalidDecl()) | |||
5536 | continue; | |||
5537 | if (BaseClassDecl->hasIrrelevantDestructor()) | |||
5538 | continue; | |||
5539 | ||||
5540 | CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); | |||
5541 | assert(Dtor && "No dtor found for BaseClassDecl!")((Dtor && "No dtor found for BaseClassDecl!") ? static_cast <void> (0) : __assert_fail ("Dtor && \"No dtor found for BaseClassDecl!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 5541, __PRETTY_FUNCTION__)); | |||
5542 | ||||
5543 | // FIXME: caret should be on the start of the class name | |||
5544 | CheckDestructorAccess(Base.getBeginLoc(), Dtor, | |||
5545 | PDiag(diag::err_access_dtor_base) | |||
5546 | << Base.getType() << Base.getSourceRange(), | |||
5547 | Context.getTypeDeclType(ClassDecl)); | |||
5548 | ||||
5549 | MarkFunctionReferenced(Location, Dtor); | |||
5550 | DiagnoseUseOfDecl(Dtor, Location); | |||
5551 | } | |||
5552 | ||||
5553 | if (VisitVirtualBases) | |||
5554 | MarkVirtualBaseDestructorsReferenced(Location, ClassDecl, | |||
5555 | &DirectVirtualBases); | |||
5556 | } | |||
5557 | ||||
5558 | void Sema::MarkVirtualBaseDestructorsReferenced( | |||
5559 | SourceLocation Location, CXXRecordDecl *ClassDecl, | |||
5560 | llvm::SmallPtrSetImpl<const RecordType *> *DirectVirtualBases) { | |||
5561 | // Virtual bases. | |||
5562 | for (const auto &VBase : ClassDecl->vbases()) { | |||
5563 | // Bases are always records in a well-formed non-dependent class. | |||
5564 | const RecordType *RT = VBase.getType()->castAs<RecordType>(); | |||
5565 | ||||
5566 | // Ignore already visited direct virtual bases. | |||
5567 | if (DirectVirtualBases && DirectVirtualBases->count(RT)) | |||
5568 | continue; | |||
5569 | ||||
5570 | CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); | |||
5571 | // If our base class is invalid, we probably can't get its dtor anyway. | |||
5572 | if (BaseClassDecl->isInvalidDecl()) | |||
5573 | continue; | |||
5574 | if (BaseClassDecl->hasIrrelevantDestructor()) | |||
5575 | continue; | |||
5576 | ||||
5577 | CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); | |||
5578 | assert(Dtor && "No dtor found for BaseClassDecl!")((Dtor && "No dtor found for BaseClassDecl!") ? static_cast <void> (0) : __assert_fail ("Dtor && \"No dtor found for BaseClassDecl!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 5578, __PRETTY_FUNCTION__)); | |||
5579 | if (CheckDestructorAccess( | |||
5580 | ClassDecl->getLocation(), Dtor, | |||
5581 | PDiag(diag::err_access_dtor_vbase) | |||
5582 | << Context.getTypeDeclType(ClassDecl) << VBase.getType(), | |||
5583 | Context.getTypeDeclType(ClassDecl)) == | |||
5584 | AR_accessible) { | |||
5585 | CheckDerivedToBaseConversion( | |||
5586 | Context.getTypeDeclType(ClassDecl), VBase.getType(), | |||
5587 | diag::err_access_dtor_vbase, 0, ClassDecl->getLocation(), | |||
5588 | SourceRange(), DeclarationName(), nullptr); | |||
5589 | } | |||
5590 | ||||
5591 | MarkFunctionReferenced(Location, Dtor); | |||
5592 | DiagnoseUseOfDecl(Dtor, Location); | |||
5593 | } | |||
5594 | } | |||
5595 | ||||
5596 | void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { | |||
5597 | if (!CDtorDecl) | |||
5598 | return; | |||
5599 | ||||
5600 | if (CXXConstructorDecl *Constructor | |||
5601 | = dyn_cast<CXXConstructorDecl>(CDtorDecl)) { | |||
5602 | SetCtorInitializers(Constructor, /*AnyErrors=*/false); | |||
5603 | DiagnoseUninitializedFields(*this, Constructor); | |||
5604 | } | |||
5605 | } | |||
5606 | ||||
5607 | bool Sema::isAbstractType(SourceLocation Loc, QualType T) { | |||
5608 | if (!getLangOpts().CPlusPlus) | |||
5609 | return false; | |||
5610 | ||||
5611 | const auto *RD = Context.getBaseElementType(T)->getAsCXXRecordDecl(); | |||
5612 | if (!RD) | |||
5613 | return false; | |||
5614 | ||||
5615 | // FIXME: Per [temp.inst]p1, we are supposed to trigger instantiation of a | |||
5616 | // class template specialization here, but doing so breaks a lot of code. | |||
5617 | ||||
5618 | // We can't answer whether something is abstract until it has a | |||
5619 | // definition. If it's currently being defined, we'll walk back | |||
5620 | // over all the declarations when we have a full definition. | |||
5621 | const CXXRecordDecl *Def = RD->getDefinition(); | |||
5622 | if (!Def || Def->isBeingDefined()) | |||
5623 | return false; | |||
5624 | ||||
5625 | return RD->isAbstract(); | |||
5626 | } | |||
5627 | ||||
5628 | bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, | |||
5629 | TypeDiagnoser &Diagnoser) { | |||
5630 | if (!isAbstractType(Loc, T)) | |||
5631 | return false; | |||
5632 | ||||
5633 | T = Context.getBaseElementType(T); | |||
5634 | Diagnoser.diagnose(*this, Loc, T); | |||
5635 | DiagnoseAbstractType(T->getAsCXXRecordDecl()); | |||
5636 | return true; | |||
5637 | } | |||
5638 | ||||
5639 | void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { | |||
5640 | // Check if we've already emitted the list of pure virtual functions | |||
5641 | // for this class. | |||
5642 | if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) | |||
5643 | return; | |||
5644 | ||||
5645 | // If the diagnostic is suppressed, don't emit the notes. We're only | |||
5646 | // going to emit them once, so try to attach them to a diagnostic we're | |||
5647 | // actually going to show. | |||
5648 | if (Diags.isLastDiagnosticIgnored()) | |||
5649 | return; | |||
5650 | ||||
5651 | CXXFinalOverriderMap FinalOverriders; | |||
5652 | RD->getFinalOverriders(FinalOverriders); | |||
5653 | ||||
5654 | // Keep a set of seen pure methods so we won't diagnose the same method | |||
5655 | // more than once. | |||
5656 | llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; | |||
5657 | ||||
5658 | for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), | |||
5659 | MEnd = FinalOverriders.end(); | |||
5660 | M != MEnd; | |||
5661 | ++M) { | |||
5662 | for (OverridingMethods::iterator SO = M->second.begin(), | |||
5663 | SOEnd = M->second.end(); | |||
5664 | SO != SOEnd; ++SO) { | |||
5665 | // C++ [class.abstract]p4: | |||
5666 | // A class is abstract if it contains or inherits at least one | |||
5667 | // pure virtual function for which the final overrider is pure | |||
5668 | // virtual. | |||
5669 | ||||
5670 | // | |||
5671 | if (SO->second.size() != 1) | |||
5672 | continue; | |||
5673 | ||||
5674 | if (!SO->second.front().Method->isPure()) | |||
5675 | continue; | |||
5676 | ||||
5677 | if (!SeenPureMethods.insert(SO->second.front().Method).second) | |||
5678 | continue; | |||
5679 | ||||
5680 | Diag(SO->second.front().Method->getLocation(), | |||
5681 | diag::note_pure_virtual_function) | |||
5682 | << SO->second.front().Method->getDeclName() << RD->getDeclName(); | |||
5683 | } | |||
5684 | } | |||
5685 | ||||
5686 | if (!PureVirtualClassDiagSet) | |||
5687 | PureVirtualClassDiagSet.reset(new RecordDeclSetTy); | |||
5688 | PureVirtualClassDiagSet->insert(RD); | |||
5689 | } | |||
5690 | ||||
5691 | namespace { | |||
5692 | struct AbstractUsageInfo { | |||
5693 | Sema &S; | |||
5694 | CXXRecordDecl *Record; | |||
5695 | CanQualType AbstractType; | |||
5696 | bool Invalid; | |||
5697 | ||||
5698 | AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) | |||
5699 | : S(S), Record(Record), | |||
5700 | AbstractType(S.Context.getCanonicalType( | |||
5701 | S.Context.getTypeDeclType(Record))), | |||
5702 | Invalid(false) {} | |||
5703 | ||||
5704 | void DiagnoseAbstractType() { | |||
5705 | if (Invalid) return; | |||
5706 | S.DiagnoseAbstractType(Record); | |||
5707 | Invalid = true; | |||
5708 | } | |||
5709 | ||||
5710 | void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); | |||
5711 | }; | |||
5712 | ||||
5713 | struct CheckAbstractUsage { | |||
5714 | AbstractUsageInfo &Info; | |||
5715 | const NamedDecl *Ctx; | |||
5716 | ||||
5717 | CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) | |||
5718 | : Info(Info), Ctx(Ctx) {} | |||
5719 | ||||
5720 | void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { | |||
5721 | switch (TL.getTypeLocClass()) { | |||
5722 | #define ABSTRACT_TYPELOC(CLASS, PARENT) | |||
5723 | #define TYPELOC(CLASS, PARENT) \ | |||
5724 | case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break; | |||
5725 | #include "clang/AST/TypeLocNodes.def" | |||
5726 | } | |||
5727 | } | |||
5728 | ||||
5729 | void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { | |||
5730 | Visit(TL.getReturnLoc(), Sema::AbstractReturnType); | |||
5731 | for (unsigned I = 0, E = TL.getNumParams(); I != E; ++I) { | |||
5732 | if (!TL.getParam(I)) | |||
5733 | continue; | |||
5734 | ||||
5735 | TypeSourceInfo *TSI = TL.getParam(I)->getTypeSourceInfo(); | |||
5736 | if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); | |||
5737 | } | |||
5738 | } | |||
5739 | ||||
5740 | void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { | |||
5741 | Visit(TL.getElementLoc(), Sema::AbstractArrayType); | |||
5742 | } | |||
5743 | ||||
5744 | void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { | |||
5745 | // Visit the type parameters from a permissive context. | |||
5746 | for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { | |||
5747 | TemplateArgumentLoc TAL = TL.getArgLoc(I); | |||
5748 | if (TAL.getArgument().getKind() == TemplateArgument::Type) | |||
5749 | if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) | |||
5750 | Visit(TSI->getTypeLoc(), Sema::AbstractNone); | |||
5751 | // TODO: other template argument types? | |||
5752 | } | |||
5753 | } | |||
5754 | ||||
5755 | // Visit pointee types from a permissive context. | |||
5756 | #define CheckPolymorphic(Type)void Check(Type TL, Sema::AbstractDiagSelID Sel) { Visit(TL.getNextTypeLoc (), Sema::AbstractNone); } \ | |||
5757 | void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ | |||
5758 | Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ | |||
5759 | } | |||
5760 | CheckPolymorphic(PointerTypeLoc)void Check(PointerTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit (TL.getNextTypeLoc(), Sema::AbstractNone); } | |||
5761 | CheckPolymorphic(ReferenceTypeLoc)void Check(ReferenceTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); } | |||
5762 | CheckPolymorphic(MemberPointerTypeLoc)void Check(MemberPointerTypeLoc TL, Sema::AbstractDiagSelID Sel ) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); } | |||
5763 | CheckPolymorphic(BlockPointerTypeLoc)void Check(BlockPointerTypeLoc TL, Sema::AbstractDiagSelID Sel ) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); } | |||
5764 | CheckPolymorphic(AtomicTypeLoc)void Check(AtomicTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit (TL.getNextTypeLoc(), Sema::AbstractNone); } | |||
5765 | ||||
5766 | /// Handle all the types we haven't given a more specific | |||
5767 | /// implementation for above. | |||
5768 | void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { | |||
5769 | // Every other kind of type that we haven't called out already | |||
5770 | // that has an inner type is either (1) sugar or (2) contains that | |||
5771 | // inner type in some way as a subobject. | |||
5772 | if (TypeLoc Next = TL.getNextTypeLoc()) | |||
5773 | return Visit(Next, Sel); | |||
5774 | ||||
5775 | // If there's no inner type and we're in a permissive context, | |||
5776 | // don't diagnose. | |||
5777 | if (Sel == Sema::AbstractNone) return; | |||
5778 | ||||
5779 | // Check whether the type matches the abstract type. | |||
5780 | QualType T = TL.getType(); | |||
5781 | if (T->isArrayType()) { | |||
5782 | Sel = Sema::AbstractArrayType; | |||
5783 | T = Info.S.Context.getBaseElementType(T); | |||
5784 | } | |||
5785 | CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); | |||
5786 | if (CT != Info.AbstractType) return; | |||
5787 | ||||
5788 | // It matched; do some magic. | |||
5789 | if (Sel == Sema::AbstractArrayType) { | |||
5790 | Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) | |||
5791 | << T << TL.getSourceRange(); | |||
5792 | } else { | |||
5793 | Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) | |||
5794 | << Sel << T << TL.getSourceRange(); | |||
5795 | } | |||
5796 | Info.DiagnoseAbstractType(); | |||
5797 | } | |||
5798 | }; | |||
5799 | ||||
5800 | void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, | |||
5801 | Sema::AbstractDiagSelID Sel) { | |||
5802 | CheckAbstractUsage(*this, D).Visit(TL, Sel); | |||
5803 | } | |||
5804 | ||||
5805 | } | |||
5806 | ||||
5807 | /// Check for invalid uses of an abstract type in a method declaration. | |||
5808 | static void CheckAbstractClassUsage(AbstractUsageInfo &Info, | |||
5809 | CXXMethodDecl *MD) { | |||
5810 | // No need to do the check on definitions, which require that | |||
5811 | // the return/param types be complete. | |||
5812 | if (MD->doesThisDeclarationHaveABody()) | |||
5813 | return; | |||
5814 | ||||
5815 | // For safety's sake, just ignore it if we don't have type source | |||
5816 | // information. This should never happen for non-implicit methods, | |||
5817 | // but... | |||
5818 | if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) | |||
5819 | Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); | |||
5820 | } | |||
5821 | ||||
5822 | /// Check for invalid uses of an abstract type within a class definition. | |||
5823 | static void CheckAbstractClassUsage(AbstractUsageInfo &Info, | |||
5824 | CXXRecordDecl *RD) { | |||
5825 | for (auto *D : RD->decls()) { | |||
5826 | if (D->isImplicit()) continue; | |||
5827 | ||||
5828 | // Methods and method templates. | |||
5829 | if (isa<CXXMethodDecl>(D)) { | |||
5830 | CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); | |||
5831 | } else if (isa<FunctionTemplateDecl>(D)) { | |||
5832 | FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); | |||
5833 | CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); | |||
5834 | ||||
5835 | // Fields and static variables. | |||
5836 | } else if (isa<FieldDecl>(D)) { | |||
5837 | FieldDecl *FD = cast<FieldDecl>(D); | |||
5838 | if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) | |||
5839 | Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); | |||
5840 | } else if (isa<VarDecl>(D)) { | |||
5841 | VarDecl *VD = cast<VarDecl>(D); | |||
5842 | if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) | |||
5843 | Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); | |||
5844 | ||||
5845 | // Nested classes and class templates. | |||
5846 | } else if (isa<CXXRecordDecl>(D)) { | |||
5847 | CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); | |||
5848 | } else if (isa<ClassTemplateDecl>(D)) { | |||
5849 | CheckAbstractClassUsage(Info, | |||
5850 | cast<ClassTemplateDecl>(D)->getTemplatedDecl()); | |||
5851 | } | |||
5852 | } | |||
5853 | } | |||
5854 | ||||
5855 | static void ReferenceDllExportedMembers(Sema &S, CXXRecordDecl *Class) { | |||
5856 | Attr *ClassAttr = getDLLAttr(Class); | |||
5857 | if (!ClassAttr) | |||
5858 | return; | |||
5859 | ||||
5860 | assert(ClassAttr->getKind() == attr::DLLExport)((ClassAttr->getKind() == attr::DLLExport) ? static_cast< void> (0) : __assert_fail ("ClassAttr->getKind() == attr::DLLExport" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 5860, __PRETTY_FUNCTION__)); | |||
5861 | ||||
5862 | TemplateSpecializationKind TSK = Class->getTemplateSpecializationKind(); | |||
5863 | ||||
5864 | if (TSK == TSK_ExplicitInstantiationDeclaration) | |||
5865 | // Don't go any further if this is just an explicit instantiation | |||
5866 | // declaration. | |||
5867 | return; | |||
5868 | ||||
5869 | // Add a context note to explain how we got to any diagnostics produced below. | |||
5870 | struct MarkingClassDllexported { | |||
5871 | Sema &S; | |||
5872 | MarkingClassDllexported(Sema &S, CXXRecordDecl *Class, | |||
5873 | SourceLocation AttrLoc) | |||
5874 | : S(S) { | |||
5875 | Sema::CodeSynthesisContext Ctx; | |||
5876 | Ctx.Kind = Sema::CodeSynthesisContext::MarkingClassDllexported; | |||
5877 | Ctx.PointOfInstantiation = AttrLoc; | |||
5878 | Ctx.Entity = Class; | |||
5879 | S.pushCodeSynthesisContext(Ctx); | |||
5880 | } | |||
5881 | ~MarkingClassDllexported() { | |||
5882 | S.popCodeSynthesisContext(); | |||
5883 | } | |||
5884 | } MarkingDllexportedContext(S, Class, ClassAttr->getLocation()); | |||
5885 | ||||
5886 | if (S.Context.getTargetInfo().getTriple().isWindowsGNUEnvironment()) | |||
5887 | S.MarkVTableUsed(Class->getLocation(), Class, true); | |||
5888 | ||||
5889 | for (Decl *Member : Class->decls()) { | |||
5890 | // Defined static variables that are members of an exported base | |||
5891 | // class must be marked export too. | |||
5892 | auto *VD = dyn_cast<VarDecl>(Member); | |||
5893 | if (VD && Member->getAttr<DLLExportAttr>() && | |||
5894 | VD->getStorageClass() == SC_Static && | |||
5895 | TSK == TSK_ImplicitInstantiation) | |||
5896 | S.MarkVariableReferenced(VD->getLocation(), VD); | |||
5897 | ||||
5898 | auto *MD = dyn_cast<CXXMethodDecl>(Member); | |||
5899 | if (!MD) | |||
5900 | continue; | |||
5901 | ||||
5902 | if (Member->getAttr<DLLExportAttr>()) { | |||
5903 | if (MD->isUserProvided()) { | |||
5904 | // Instantiate non-default class member functions ... | |||
5905 | ||||
5906 | // .. except for certain kinds of template specializations. | |||
5907 | if (TSK == TSK_ImplicitInstantiation && !ClassAttr->isInherited()) | |||
5908 | continue; | |||
5909 | ||||
5910 | S.MarkFunctionReferenced(Class->getLocation(), MD); | |||
5911 | ||||
5912 | // The function will be passed to the consumer when its definition is | |||
5913 | // encountered. | |||
5914 | } else if (MD->isExplicitlyDefaulted()) { | |||
5915 | // Synthesize and instantiate explicitly defaulted methods. | |||
5916 | S.MarkFunctionReferenced(Class->getLocation(), MD); | |||
5917 | ||||
5918 | if (TSK != TSK_ExplicitInstantiationDefinition) { | |||
5919 | // Except for explicit instantiation defs, we will not see the | |||
5920 | // definition again later, so pass it to the consumer now. | |||
5921 | S.Consumer.HandleTopLevelDecl(DeclGroupRef(MD)); | |||
5922 | } | |||
5923 | } else if (!MD->isTrivial() || | |||
5924 | MD->isCopyAssignmentOperator() || | |||
5925 | MD->isMoveAssignmentOperator()) { | |||
5926 | // Synthesize and instantiate non-trivial implicit methods, and the copy | |||
5927 | // and move assignment operators. The latter are exported even if they | |||
5928 | // are trivial, because the address of an operator can be taken and | |||
5929 | // should compare equal across libraries. | |||
5930 | S.MarkFunctionReferenced(Class->getLocation(), MD); | |||
5931 | ||||
5932 | // There is no later point when we will see the definition of this | |||
5933 | // function, so pass it to the consumer now. | |||
5934 | S.Consumer.HandleTopLevelDecl(DeclGroupRef(MD)); | |||
5935 | } | |||
5936 | } | |||
5937 | } | |||
5938 | } | |||
5939 | ||||
5940 | static void checkForMultipleExportedDefaultConstructors(Sema &S, | |||
5941 | CXXRecordDecl *Class) { | |||
5942 | // Only the MS ABI has default constructor closures, so we don't need to do | |||
5943 | // this semantic checking anywhere else. | |||
5944 | if (!S.Context.getTargetInfo().getCXXABI().isMicrosoft()) | |||
5945 | return; | |||
5946 | ||||
5947 | CXXConstructorDecl *LastExportedDefaultCtor = nullptr; | |||
5948 | for (Decl *Member : Class->decls()) { | |||
5949 | // Look for exported default constructors. | |||
5950 | auto *CD = dyn_cast<CXXConstructorDecl>(Member); | |||
5951 | if (!CD || !CD->isDefaultConstructor()) | |||
5952 | continue; | |||
5953 | auto *Attr = CD->getAttr<DLLExportAttr>(); | |||
5954 | if (!Attr) | |||
5955 | continue; | |||
5956 | ||||
5957 | // If the class is non-dependent, mark the default arguments as ODR-used so | |||
5958 | // that we can properly codegen the constructor closure. | |||
5959 | if (!Class->isDependentContext()) { | |||
5960 | for (ParmVarDecl *PD : CD->parameters()) { | |||
5961 | (void)S.CheckCXXDefaultArgExpr(Attr->getLocation(), CD, PD); | |||
5962 | S.DiscardCleanupsInEvaluationContext(); | |||
5963 | } | |||
5964 | } | |||
5965 | ||||
5966 | if (LastExportedDefaultCtor) { | |||
5967 | S.Diag(LastExportedDefaultCtor->getLocation(), | |||
5968 | diag::err_attribute_dll_ambiguous_default_ctor) | |||
5969 | << Class; | |||
5970 | S.Diag(CD->getLocation(), diag::note_entity_declared_at) | |||
5971 | << CD->getDeclName(); | |||
5972 | return; | |||
5973 | } | |||
5974 | LastExportedDefaultCtor = CD; | |||
5975 | } | |||
5976 | } | |||
5977 | ||||
5978 | static void checkCUDADeviceBuiltinSurfaceClassTemplate(Sema &S, | |||
5979 | CXXRecordDecl *Class) { | |||
5980 | bool ErrorReported = false; | |||
5981 | auto reportIllegalClassTemplate = [&ErrorReported](Sema &S, | |||
5982 | ClassTemplateDecl *TD) { | |||
5983 | if (ErrorReported) | |||
5984 | return; | |||
5985 | S.Diag(TD->getLocation(), | |||
5986 | diag::err_cuda_device_builtin_surftex_cls_template) | |||
5987 | << /*surface*/ 0 << TD; | |||
5988 | ErrorReported = true; | |||
5989 | }; | |||
5990 | ||||
5991 | ClassTemplateDecl *TD = Class->getDescribedClassTemplate(); | |||
5992 | if (!TD) { | |||
5993 | auto *SD = dyn_cast<ClassTemplateSpecializationDecl>(Class); | |||
5994 | if (!SD) { | |||
5995 | S.Diag(Class->getLocation(), | |||
5996 | diag::err_cuda_device_builtin_surftex_ref_decl) | |||
5997 | << /*surface*/ 0 << Class; | |||
5998 | S.Diag(Class->getLocation(), | |||
5999 | diag::note_cuda_device_builtin_surftex_should_be_template_class) | |||
6000 | << Class; | |||
6001 | return; | |||
6002 | } | |||
6003 | TD = SD->getSpecializedTemplate(); | |||
6004 | } | |||
6005 | ||||
6006 | TemplateParameterList *Params = TD->getTemplateParameters(); | |||
6007 | unsigned N = Params->size(); | |||
6008 | ||||
6009 | if (N != 2) { | |||
6010 | reportIllegalClassTemplate(S, TD); | |||
6011 | S.Diag(TD->getLocation(), | |||
6012 | diag::note_cuda_device_builtin_surftex_cls_should_have_n_args) | |||
6013 | << TD << 2; | |||
6014 | } | |||
6015 | if (N > 0 && !isa<TemplateTypeParmDecl>(Params->getParam(0))) { | |||
6016 | reportIllegalClassTemplate(S, TD); | |||
6017 | S.Diag(TD->getLocation(), | |||
6018 | diag::note_cuda_device_builtin_surftex_cls_should_have_match_arg) | |||
6019 | << TD << /*1st*/ 0 << /*type*/ 0; | |||
6020 | } | |||
6021 | if (N > 1) { | |||
6022 | auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(1)); | |||
6023 | if (!NTTP || !NTTP->getType()->isIntegralOrEnumerationType()) { | |||
6024 | reportIllegalClassTemplate(S, TD); | |||
6025 | S.Diag(TD->getLocation(), | |||
6026 | diag::note_cuda_device_builtin_surftex_cls_should_have_match_arg) | |||
6027 | << TD << /*2nd*/ 1 << /*integer*/ 1; | |||
6028 | } | |||
6029 | } | |||
6030 | } | |||
6031 | ||||
6032 | static void checkCUDADeviceBuiltinTextureClassTemplate(Sema &S, | |||
6033 | CXXRecordDecl *Class) { | |||
6034 | bool ErrorReported = false; | |||
6035 | auto reportIllegalClassTemplate = [&ErrorReported](Sema &S, | |||
6036 | ClassTemplateDecl *TD) { | |||
6037 | if (ErrorReported) | |||
6038 | return; | |||
6039 | S.Diag(TD->getLocation(), | |||
6040 | diag::err_cuda_device_builtin_surftex_cls_template) | |||
6041 | << /*texture*/ 1 << TD; | |||
6042 | ErrorReported = true; | |||
6043 | }; | |||
6044 | ||||
6045 | ClassTemplateDecl *TD = Class->getDescribedClassTemplate(); | |||
6046 | if (!TD) { | |||
6047 | auto *SD = dyn_cast<ClassTemplateSpecializationDecl>(Class); | |||
6048 | if (!SD) { | |||
6049 | S.Diag(Class->getLocation(), | |||
6050 | diag::err_cuda_device_builtin_surftex_ref_decl) | |||
6051 | << /*texture*/ 1 << Class; | |||
6052 | S.Diag(Class->getLocation(), | |||
6053 | diag::note_cuda_device_builtin_surftex_should_be_template_class) | |||
6054 | << Class; | |||
6055 | return; | |||
6056 | } | |||
6057 | TD = SD->getSpecializedTemplate(); | |||
6058 | } | |||
6059 | ||||
6060 | TemplateParameterList *Params = TD->getTemplateParameters(); | |||
6061 | unsigned N = Params->size(); | |||
6062 | ||||
6063 | if (N != 3) { | |||
6064 | reportIllegalClassTemplate(S, TD); | |||
6065 | S.Diag(TD->getLocation(), | |||
6066 | diag::note_cuda_device_builtin_surftex_cls_should_have_n_args) | |||
6067 | << TD << 3; | |||
6068 | } | |||
6069 | if (N > 0 && !isa<TemplateTypeParmDecl>(Params->getParam(0))) { | |||
6070 | reportIllegalClassTemplate(S, TD); | |||
6071 | S.Diag(TD->getLocation(), | |||
6072 | diag::note_cuda_device_builtin_surftex_cls_should_have_match_arg) | |||
6073 | << TD << /*1st*/ 0 << /*type*/ 0; | |||
6074 | } | |||
6075 | if (N > 1) { | |||
6076 | auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(1)); | |||
6077 | if (!NTTP || !NTTP->getType()->isIntegralOrEnumerationType()) { | |||
6078 | reportIllegalClassTemplate(S, TD); | |||
6079 | S.Diag(TD->getLocation(), | |||
6080 | diag::note_cuda_device_builtin_surftex_cls_should_have_match_arg) | |||
6081 | << TD << /*2nd*/ 1 << /*integer*/ 1; | |||
6082 | } | |||
6083 | } | |||
6084 | if (N > 2) { | |||
6085 | auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(2)); | |||
6086 | if (!NTTP || !NTTP->getType()->isIntegralOrEnumerationType()) { | |||
6087 | reportIllegalClassTemplate(S, TD); | |||
6088 | S.Diag(TD->getLocation(), | |||
6089 | diag::note_cuda_device_builtin_surftex_cls_should_have_match_arg) | |||
6090 | << TD << /*3rd*/ 2 << /*integer*/ 1; | |||
6091 | } | |||
6092 | } | |||
6093 | } | |||
6094 | ||||
6095 | void Sema::checkClassLevelCodeSegAttribute(CXXRecordDecl *Class) { | |||
6096 | // Mark any compiler-generated routines with the implicit code_seg attribute. | |||
6097 | for (auto *Method : Class->methods()) { | |||
6098 | if (Method->isUserProvided()) | |||
6099 | continue; | |||
6100 | if (Attr *A = getImplicitCodeSegOrSectionAttrForFunction(Method, /*IsDefinition=*/true)) | |||
6101 | Method->addAttr(A); | |||
6102 | } | |||
6103 | } | |||
6104 | ||||
6105 | /// Check class-level dllimport/dllexport attribute. | |||
6106 | void Sema::checkClassLevelDLLAttribute(CXXRecordDecl *Class) { | |||
6107 | Attr *ClassAttr = getDLLAttr(Class); | |||
6108 | ||||
6109 | // MSVC inherits DLL attributes to partial class template specializations. | |||
6110 | if (Context.getTargetInfo().shouldDLLImportComdatSymbols() && !ClassAttr) { | |||
6111 | if (auto *Spec = dyn_cast<ClassTemplatePartialSpecializationDecl>(Class)) { | |||
6112 | if (Attr *TemplateAttr = | |||
6113 | getDLLAttr(Spec->getSpecializedTemplate()->getTemplatedDecl())) { | |||
6114 | auto *A = cast<InheritableAttr>(TemplateAttr->clone(getASTContext())); | |||
6115 | A->setInherited(true); | |||
6116 | ClassAttr = A; | |||
6117 | } | |||
6118 | } | |||
6119 | } | |||
6120 | ||||
6121 | if (!ClassAttr) | |||
6122 | return; | |||
6123 | ||||
6124 | if (!Class->isExternallyVisible()) { | |||
6125 | Diag(Class->getLocation(), diag::err_attribute_dll_not_extern) | |||
6126 | << Class << ClassAttr; | |||
6127 | return; | |||
6128 | } | |||
6129 | ||||
6130 | if (Context.getTargetInfo().shouldDLLImportComdatSymbols() && | |||
6131 | !ClassAttr->isInherited()) { | |||
6132 | // Diagnose dll attributes on members of class with dll attribute. | |||
6133 | for (Decl *Member : Class->decls()) { | |||
6134 | if (!isa<VarDecl>(Member) && !isa<CXXMethodDecl>(Member)) | |||
6135 | continue; | |||
6136 | InheritableAttr *MemberAttr = getDLLAttr(Member); | |||
6137 | if (!MemberAttr || MemberAttr->isInherited() || Member->isInvalidDecl()) | |||
6138 | continue; | |||
6139 | ||||
6140 | Diag(MemberAttr->getLocation(), | |||
6141 | diag::err_attribute_dll_member_of_dll_class) | |||
6142 | << MemberAttr << ClassAttr; | |||
6143 | Diag(ClassAttr->getLocation(), diag::note_previous_attribute); | |||
6144 | Member->setInvalidDecl(); | |||
6145 | } | |||
6146 | } | |||
6147 | ||||
6148 | if (Class->getDescribedClassTemplate()) | |||
6149 | // Don't inherit dll attribute until the template is instantiated. | |||
6150 | return; | |||
6151 | ||||
6152 | // The class is either imported or exported. | |||
6153 | const bool ClassExported = ClassAttr->getKind() == attr::DLLExport; | |||
6154 | ||||
6155 | // Check if this was a dllimport attribute propagated from a derived class to | |||
6156 | // a base class template specialization. We don't apply these attributes to | |||
6157 | // static data members. | |||
6158 | const bool PropagatedImport = | |||
6159 | !ClassExported && | |||
6160 | cast<DLLImportAttr>(ClassAttr)->wasPropagatedToBaseTemplate(); | |||
6161 | ||||
6162 | TemplateSpecializationKind TSK = Class->getTemplateSpecializationKind(); | |||
6163 | ||||
6164 | // Ignore explicit dllexport on explicit class template instantiation | |||
6165 | // declarations, except in MinGW mode. | |||
6166 | if (ClassExported && !ClassAttr->isInherited() && | |||
6167 | TSK == TSK_ExplicitInstantiationDeclaration && | |||
6168 | !Context.getTargetInfo().getTriple().isWindowsGNUEnvironment()) { | |||
6169 | Class->dropAttr<DLLExportAttr>(); | |||
6170 | return; | |||
6171 | } | |||
6172 | ||||
6173 | // Force declaration of implicit members so they can inherit the attribute. | |||
6174 | ForceDeclarationOfImplicitMembers(Class); | |||
6175 | ||||
6176 | // FIXME: MSVC's docs say all bases must be exportable, but this doesn't | |||
6177 | // seem to be true in practice? | |||
6178 | ||||
6179 | for (Decl *Member : Class->decls()) { | |||
6180 | VarDecl *VD = dyn_cast<VarDecl>(Member); | |||
6181 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); | |||
6182 | ||||
6183 | // Only methods and static fields inherit the attributes. | |||
6184 | if (!VD && !MD) | |||
6185 | continue; | |||
6186 | ||||
6187 | if (MD) { | |||
6188 | // Don't process deleted methods. | |||
6189 | if (MD->isDeleted()) | |||
6190 | continue; | |||
6191 | ||||
6192 | if (MD->isInlined()) { | |||
6193 | // MinGW does not import or export inline methods. But do it for | |||
6194 | // template instantiations. | |||
6195 | if (!Context.getTargetInfo().shouldDLLImportComdatSymbols() && | |||
6196 | TSK != TSK_ExplicitInstantiationDeclaration && | |||
6197 | TSK != TSK_ExplicitInstantiationDefinition) | |||
6198 | continue; | |||
6199 | ||||
6200 | // MSVC versions before 2015 don't export the move assignment operators | |||
6201 | // and move constructor, so don't attempt to import/export them if | |||
6202 | // we have a definition. | |||
6203 | auto *Ctor = dyn_cast<CXXConstructorDecl>(MD); | |||
6204 | if ((MD->isMoveAssignmentOperator() || | |||
6205 | (Ctor && Ctor->isMoveConstructor())) && | |||
6206 | !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015)) | |||
6207 | continue; | |||
6208 | ||||
6209 | // MSVC2015 doesn't export trivial defaulted x-tor but copy assign | |||
6210 | // operator is exported anyway. | |||
6211 | if (getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015) && | |||
6212 | (Ctor || isa<CXXDestructorDecl>(MD)) && MD->isTrivial()) | |||
6213 | continue; | |||
6214 | } | |||
6215 | } | |||
6216 | ||||
6217 | // Don't apply dllimport attributes to static data members of class template | |||
6218 | // instantiations when the attribute is propagated from a derived class. | |||
6219 | if (VD && PropagatedImport) | |||
6220 | continue; | |||
6221 | ||||
6222 | if (!cast<NamedDecl>(Member)->isExternallyVisible()) | |||
6223 | continue; | |||
6224 | ||||
6225 | if (!getDLLAttr(Member)) { | |||
6226 | InheritableAttr *NewAttr = nullptr; | |||
6227 | ||||
6228 | // Do not export/import inline function when -fno-dllexport-inlines is | |||
6229 | // passed. But add attribute for later local static var check. | |||
6230 | if (!getLangOpts().DllExportInlines && MD && MD->isInlined() && | |||
6231 | TSK != TSK_ExplicitInstantiationDeclaration && | |||
6232 | TSK != TSK_ExplicitInstantiationDefinition) { | |||
6233 | if (ClassExported) { | |||
6234 | NewAttr = ::new (getASTContext()) | |||
6235 | DLLExportStaticLocalAttr(getASTContext(), *ClassAttr); | |||
6236 | } else { | |||
6237 | NewAttr = ::new (getASTContext()) | |||
6238 | DLLImportStaticLocalAttr(getASTContext(), *ClassAttr); | |||
6239 | } | |||
6240 | } else { | |||
6241 | NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext())); | |||
6242 | } | |||
6243 | ||||
6244 | NewAttr->setInherited(true); | |||
6245 | Member->addAttr(NewAttr); | |||
6246 | ||||
6247 | if (MD) { | |||
6248 | // Propagate DLLAttr to friend re-declarations of MD that have already | |||
6249 | // been constructed. | |||
6250 | for (FunctionDecl *FD = MD->getMostRecentDecl(); FD; | |||
6251 | FD = FD->getPreviousDecl()) { | |||
6252 | if (FD->getFriendObjectKind() == Decl::FOK_None) | |||
6253 | continue; | |||
6254 | assert(!getDLLAttr(FD) &&((!getDLLAttr(FD) && "friend re-decl should not already have a DLLAttr" ) ? static_cast<void> (0) : __assert_fail ("!getDLLAttr(FD) && \"friend re-decl should not already have a DLLAttr\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 6255, __PRETTY_FUNCTION__)) | |||
6255 | "friend re-decl should not already have a DLLAttr")((!getDLLAttr(FD) && "friend re-decl should not already have a DLLAttr" ) ? static_cast<void> (0) : __assert_fail ("!getDLLAttr(FD) && \"friend re-decl should not already have a DLLAttr\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 6255, __PRETTY_FUNCTION__)); | |||
6256 | NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext())); | |||
6257 | NewAttr->setInherited(true); | |||
6258 | FD->addAttr(NewAttr); | |||
6259 | } | |||
6260 | } | |||
6261 | } | |||
6262 | } | |||
6263 | ||||
6264 | if (ClassExported) | |||
6265 | DelayedDllExportClasses.push_back(Class); | |||
6266 | } | |||
6267 | ||||
6268 | /// Perform propagation of DLL attributes from a derived class to a | |||
6269 | /// templated base class for MS compatibility. | |||
6270 | void Sema::propagateDLLAttrToBaseClassTemplate( | |||
6271 | CXXRecordDecl *Class, Attr *ClassAttr, | |||
6272 | ClassTemplateSpecializationDecl *BaseTemplateSpec, SourceLocation BaseLoc) { | |||
6273 | if (getDLLAttr( | |||
6274 | BaseTemplateSpec->getSpecializedTemplate()->getTemplatedDecl())) { | |||
6275 | // If the base class template has a DLL attribute, don't try to change it. | |||
6276 | return; | |||
6277 | } | |||
6278 | ||||
6279 | auto TSK = BaseTemplateSpec->getSpecializationKind(); | |||
6280 | if (!getDLLAttr(BaseTemplateSpec) && | |||
6281 | (TSK == TSK_Undeclared || TSK == TSK_ExplicitInstantiationDeclaration || | |||
6282 | TSK == TSK_ImplicitInstantiation)) { | |||
6283 | // The template hasn't been instantiated yet (or it has, but only as an | |||
6284 | // explicit instantiation declaration or implicit instantiation, which means | |||
6285 | // we haven't codegenned any members yet), so propagate the attribute. | |||
6286 | auto *NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext())); | |||
6287 | NewAttr->setInherited(true); | |||
6288 | BaseTemplateSpec->addAttr(NewAttr); | |||
6289 | ||||
6290 | // If this was an import, mark that we propagated it from a derived class to | |||
6291 | // a base class template specialization. | |||
6292 | if (auto *ImportAttr = dyn_cast<DLLImportAttr>(NewAttr)) | |||
6293 | ImportAttr->setPropagatedToBaseTemplate(); | |||
6294 | ||||
6295 | // If the template is already instantiated, checkDLLAttributeRedeclaration() | |||
6296 | // needs to be run again to work see the new attribute. Otherwise this will | |||
6297 | // get run whenever the template is instantiated. | |||
6298 | if (TSK != TSK_Undeclared) | |||
6299 | checkClassLevelDLLAttribute(BaseTemplateSpec); | |||
6300 | ||||
6301 | return; | |||
6302 | } | |||
6303 | ||||
6304 | if (getDLLAttr(BaseTemplateSpec)) { | |||
6305 | // The template has already been specialized or instantiated with an | |||
6306 | // attribute, explicitly or through propagation. We should not try to change | |||
6307 | // it. | |||
6308 | return; | |||
6309 | } | |||
6310 | ||||
6311 | // The template was previously instantiated or explicitly specialized without | |||
6312 | // a dll attribute, It's too late for us to add an attribute, so warn that | |||
6313 | // this is unsupported. | |||
6314 | Diag(BaseLoc, diag::warn_attribute_dll_instantiated_base_class) | |||
6315 | << BaseTemplateSpec->isExplicitSpecialization(); | |||
6316 | Diag(ClassAttr->getLocation(), diag::note_attribute); | |||
6317 | if (BaseTemplateSpec->isExplicitSpecialization()) { | |||
6318 | Diag(BaseTemplateSpec->getLocation(), | |||
6319 | diag::note_template_class_explicit_specialization_was_here) | |||
6320 | << BaseTemplateSpec; | |||
6321 | } else { | |||
6322 | Diag(BaseTemplateSpec->getPointOfInstantiation(), | |||
6323 | diag::note_template_class_instantiation_was_here) | |||
6324 | << BaseTemplateSpec; | |||
6325 | } | |||
6326 | } | |||
6327 | ||||
6328 | /// Determine the kind of defaulting that would be done for a given function. | |||
6329 | /// | |||
6330 | /// If the function is both a default constructor and a copy / move constructor | |||
6331 | /// (due to having a default argument for the first parameter), this picks | |||
6332 | /// CXXDefaultConstructor. | |||
6333 | /// | |||
6334 | /// FIXME: Check that case is properly handled by all callers. | |||
6335 | Sema::DefaultedFunctionKind | |||
6336 | Sema::getDefaultedFunctionKind(const FunctionDecl *FD) { | |||
6337 | if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) { | |||
6338 | if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(FD)) { | |||
6339 | if (Ctor->isDefaultConstructor()) | |||
6340 | return Sema::CXXDefaultConstructor; | |||
6341 | ||||
6342 | if (Ctor->isCopyConstructor()) | |||
6343 | return Sema::CXXCopyConstructor; | |||
6344 | ||||
6345 | if (Ctor->isMoveConstructor()) | |||
6346 | return Sema::CXXMoveConstructor; | |||
6347 | } | |||
6348 | ||||
6349 | if (MD->isCopyAssignmentOperator()) | |||
6350 | return Sema::CXXCopyAssignment; | |||
6351 | ||||
6352 | if (MD->isMoveAssignmentOperator()) | |||
6353 | return Sema::CXXMoveAssignment; | |||
6354 | ||||
6355 | if (isa<CXXDestructorDecl>(FD)) | |||
6356 | return Sema::CXXDestructor; | |||
6357 | } | |||
6358 | ||||
6359 | switch (FD->getDeclName().getCXXOverloadedOperator()) { | |||
6360 | case OO_EqualEqual: | |||
6361 | return DefaultedComparisonKind::Equal; | |||
6362 | ||||
6363 | case OO_ExclaimEqual: | |||
6364 | return DefaultedComparisonKind::NotEqual; | |||
6365 | ||||
6366 | case OO_Spaceship: | |||
6367 | // No point allowing this if <=> doesn't exist in the current language mode. | |||
6368 | if (!getLangOpts().CPlusPlus20) | |||
6369 | break; | |||
6370 | return DefaultedComparisonKind::ThreeWay; | |||
6371 | ||||
6372 | case OO_Less: | |||
6373 | case OO_LessEqual: | |||
6374 | case OO_Greater: | |||
6375 | case OO_GreaterEqual: | |||
6376 | // No point allowing this if <=> doesn't exist in the current language mode. | |||
6377 | if (!getLangOpts().CPlusPlus20) | |||
6378 | break; | |||
6379 | return DefaultedComparisonKind::Relational; | |||
6380 | ||||
6381 | default: | |||
6382 | break; | |||
6383 | } | |||
6384 | ||||
6385 | // Not defaultable. | |||
6386 | return DefaultedFunctionKind(); | |||
6387 | } | |||
6388 | ||||
6389 | static void DefineDefaultedFunction(Sema &S, FunctionDecl *FD, | |||
6390 | SourceLocation DefaultLoc) { | |||
6391 | Sema::DefaultedFunctionKind DFK = S.getDefaultedFunctionKind(FD); | |||
6392 | if (DFK.isComparison()) | |||
6393 | return S.DefineDefaultedComparison(DefaultLoc, FD, DFK.asComparison()); | |||
6394 | ||||
6395 | switch (DFK.asSpecialMember()) { | |||
6396 | case Sema::CXXDefaultConstructor: | |||
6397 | S.DefineImplicitDefaultConstructor(DefaultLoc, | |||
6398 | cast<CXXConstructorDecl>(FD)); | |||
6399 | break; | |||
6400 | case Sema::CXXCopyConstructor: | |||
6401 | S.DefineImplicitCopyConstructor(DefaultLoc, cast<CXXConstructorDecl>(FD)); | |||
6402 | break; | |||
6403 | case Sema::CXXCopyAssignment: | |||
6404 | S.DefineImplicitCopyAssignment(DefaultLoc, cast<CXXMethodDecl>(FD)); | |||
6405 | break; | |||
6406 | case Sema::CXXDestructor: | |||
6407 | S.DefineImplicitDestructor(DefaultLoc, cast<CXXDestructorDecl>(FD)); | |||
6408 | break; | |||
6409 | case Sema::CXXMoveConstructor: | |||
6410 | S.DefineImplicitMoveConstructor(DefaultLoc, cast<CXXConstructorDecl>(FD)); | |||
6411 | break; | |||
6412 | case Sema::CXXMoveAssignment: | |||
6413 | S.DefineImplicitMoveAssignment(DefaultLoc, cast<CXXMethodDecl>(FD)); | |||
6414 | break; | |||
6415 | case Sema::CXXInvalid: | |||
6416 | llvm_unreachable("Invalid special member.")::llvm::llvm_unreachable_internal("Invalid special member.", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 6416); | |||
6417 | } | |||
6418 | } | |||
6419 | ||||
6420 | /// Determine whether a type is permitted to be passed or returned in | |||
6421 | /// registers, per C++ [class.temporary]p3. | |||
6422 | static bool canPassInRegisters(Sema &S, CXXRecordDecl *D, | |||
6423 | TargetInfo::CallingConvKind CCK) { | |||
6424 | if (D->isDependentType() || D->isInvalidDecl()) | |||
6425 | return false; | |||
6426 | ||||
6427 | // Clang <= 4 used the pre-C++11 rule, which ignores move operations. | |||
6428 | // The PS4 platform ABI follows the behavior of Clang 3.2. | |||
6429 | if (CCK == TargetInfo::CCK_ClangABI4OrPS4) | |||
6430 | return !D->hasNonTrivialDestructorForCall() && | |||
6431 | !D->hasNonTrivialCopyConstructorForCall(); | |||
6432 | ||||
6433 | if (CCK == TargetInfo::CCK_MicrosoftWin64) { | |||
6434 | bool CopyCtorIsTrivial = false, CopyCtorIsTrivialForCall = false; | |||
6435 | bool DtorIsTrivialForCall = false; | |||
6436 | ||||
6437 | // If a class has at least one non-deleted, trivial copy constructor, it | |||
6438 | // is passed according to the C ABI. Otherwise, it is passed indirectly. | |||
6439 | // | |||
6440 | // Note: This permits classes with non-trivial copy or move ctors to be | |||
6441 | // passed in registers, so long as they *also* have a trivial copy ctor, | |||
6442 | // which is non-conforming. | |||
6443 | if (D->needsImplicitCopyConstructor()) { | |||
6444 | if (!D->defaultedCopyConstructorIsDeleted()) { | |||
6445 | if (D->hasTrivialCopyConstructor()) | |||
6446 | CopyCtorIsTrivial = true; | |||
6447 | if (D->hasTrivialCopyConstructorForCall()) | |||
6448 | CopyCtorIsTrivialForCall = true; | |||
6449 | } | |||
6450 | } else { | |||
6451 | for (const CXXConstructorDecl *CD : D->ctors()) { | |||
6452 | if (CD->isCopyConstructor() && !CD->isDeleted()) { | |||
6453 | if (CD->isTrivial()) | |||
6454 | CopyCtorIsTrivial = true; | |||
6455 | if (CD->isTrivialForCall()) | |||
6456 | CopyCtorIsTrivialForCall = true; | |||
6457 | } | |||
6458 | } | |||
6459 | } | |||
6460 | ||||
6461 | if (D->needsImplicitDestructor()) { | |||
6462 | if (!D->defaultedDestructorIsDeleted() && | |||
6463 | D->hasTrivialDestructorForCall()) | |||
6464 | DtorIsTrivialForCall = true; | |||
6465 | } else if (const auto *DD = D->getDestructor()) { | |||
6466 | if (!DD->isDeleted() && DD->isTrivialForCall()) | |||
6467 | DtorIsTrivialForCall = true; | |||
6468 | } | |||
6469 | ||||
6470 | // If the copy ctor and dtor are both trivial-for-calls, pass direct. | |||
6471 | if (CopyCtorIsTrivialForCall && DtorIsTrivialForCall) | |||
6472 | return true; | |||
6473 | ||||
6474 | // If a class has a destructor, we'd really like to pass it indirectly | |||
6475 | // because it allows us to elide copies. Unfortunately, MSVC makes that | |||
6476 | // impossible for small types, which it will pass in a single register or | |||
6477 | // stack slot. Most objects with dtors are large-ish, so handle that early. | |||
6478 | // We can't call out all large objects as being indirect because there are | |||
6479 | // multiple x64 calling conventions and the C++ ABI code shouldn't dictate | |||
6480 | // how we pass large POD types. | |||
6481 | ||||
6482 | // Note: This permits small classes with nontrivial destructors to be | |||
6483 | // passed in registers, which is non-conforming. | |||
6484 | bool isAArch64 = S.Context.getTargetInfo().getTriple().isAArch64(); | |||
6485 | uint64_t TypeSize = isAArch64 ? 128 : 64; | |||
6486 | ||||
6487 | if (CopyCtorIsTrivial && | |||
6488 | S.getASTContext().getTypeSize(D->getTypeForDecl()) <= TypeSize) | |||
6489 | return true; | |||
6490 | return false; | |||
6491 | } | |||
6492 | ||||
6493 | // Per C++ [class.temporary]p3, the relevant condition is: | |||
6494 | // each copy constructor, move constructor, and destructor of X is | |||
6495 | // either trivial or deleted, and X has at least one non-deleted copy | |||
6496 | // or move constructor | |||
6497 | bool HasNonDeletedCopyOrMove = false; | |||
6498 | ||||
6499 | if (D->needsImplicitCopyConstructor() && | |||
6500 | !D->defaultedCopyConstructorIsDeleted()) { | |||
6501 | if (!D->hasTrivialCopyConstructorForCall()) | |||
6502 | return false; | |||
6503 | HasNonDeletedCopyOrMove = true; | |||
6504 | } | |||
6505 | ||||
6506 | if (S.getLangOpts().CPlusPlus11 && D->needsImplicitMoveConstructor() && | |||
6507 | !D->defaultedMoveConstructorIsDeleted()) { | |||
6508 | if (!D->hasTrivialMoveConstructorForCall()) | |||
6509 | return false; | |||
6510 | HasNonDeletedCopyOrMove = true; | |||
6511 | } | |||
6512 | ||||
6513 | if (D->needsImplicitDestructor() && !D->defaultedDestructorIsDeleted() && | |||
6514 | !D->hasTrivialDestructorForCall()) | |||
6515 | return false; | |||
6516 | ||||
6517 | for (const CXXMethodDecl *MD : D->methods()) { | |||
6518 | if (MD->isDeleted()) | |||
6519 | continue; | |||
6520 | ||||
6521 | auto *CD = dyn_cast<CXXConstructorDecl>(MD); | |||
6522 | if (CD && CD->isCopyOrMoveConstructor()) | |||
6523 | HasNonDeletedCopyOrMove = true; | |||
6524 | else if (!isa<CXXDestructorDecl>(MD)) | |||
6525 | continue; | |||
6526 | ||||
6527 | if (!MD->isTrivialForCall()) | |||
6528 | return false; | |||
6529 | } | |||
6530 | ||||
6531 | return HasNonDeletedCopyOrMove; | |||
6532 | } | |||
6533 | ||||
6534 | /// Report an error regarding overriding, along with any relevant | |||
6535 | /// overridden methods. | |||
6536 | /// | |||
6537 | /// \param DiagID the primary error to report. | |||
6538 | /// \param MD the overriding method. | |||
6539 | static bool | |||
6540 | ReportOverrides(Sema &S, unsigned DiagID, const CXXMethodDecl *MD, | |||
6541 | llvm::function_ref<bool(const CXXMethodDecl *)> Report) { | |||
6542 | bool IssuedDiagnostic = false; | |||
6543 | for (const CXXMethodDecl *O : MD->overridden_methods()) { | |||
6544 | if (Report(O)) { | |||
6545 | if (!IssuedDiagnostic) { | |||
6546 | S.Diag(MD->getLocation(), DiagID) << MD->getDeclName(); | |||
6547 | IssuedDiagnostic = true; | |||
6548 | } | |||
6549 | S.Diag(O->getLocation(), diag::note_overridden_virtual_function); | |||
6550 | } | |||
6551 | } | |||
6552 | return IssuedDiagnostic; | |||
6553 | } | |||
6554 | ||||
6555 | /// Perform semantic checks on a class definition that has been | |||
6556 | /// completing, introducing implicitly-declared members, checking for | |||
6557 | /// abstract types, etc. | |||
6558 | /// | |||
6559 | /// \param S The scope in which the class was parsed. Null if we didn't just | |||
6560 | /// parse a class definition. | |||
6561 | /// \param Record The completed class. | |||
6562 | void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { | |||
6563 | if (!Record) | |||
6564 | return; | |||
6565 | ||||
6566 | if (Record->isAbstract() && !Record->isInvalidDecl()) { | |||
6567 | AbstractUsageInfo Info(*this, Record); | |||
6568 | CheckAbstractClassUsage(Info, Record); | |||
6569 | } | |||
6570 | ||||
6571 | // If this is not an aggregate type and has no user-declared constructor, | |||
6572 | // complain about any non-static data members of reference or const scalar | |||
6573 | // type, since they will never get initializers. | |||
6574 | if (!Record->isInvalidDecl() && !Record->isDependentType() && | |||
6575 | !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && | |||
6576 | !Record->isLambda()) { | |||
6577 | bool Complained = false; | |||
6578 | for (const auto *F : Record->fields()) { | |||
6579 | if (F->hasInClassInitializer() || F->isUnnamedBitfield()) | |||
6580 | continue; | |||
6581 | ||||
6582 | if (F->getType()->isReferenceType() || | |||
6583 | (F->getType().isConstQualified() && F->getType()->isScalarType())) { | |||
6584 | if (!Complained) { | |||
6585 | Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) | |||
6586 | << Record->getTagKind() << Record; | |||
6587 | Complained = true; | |||
6588 | } | |||
6589 | ||||
6590 | Diag(F->getLocation(), diag::note_refconst_member_not_initialized) | |||
6591 | << F->getType()->isReferenceType() | |||
6592 | << F->getDeclName(); | |||
6593 | } | |||
6594 | } | |||
6595 | } | |||
6596 | ||||
6597 | if (Record->getIdentifier()) { | |||
6598 | // C++ [class.mem]p13: | |||
6599 | // If T is the name of a class, then each of the following shall have a | |||
6600 | // name different from T: | |||
6601 | // - every member of every anonymous union that is a member of class T. | |||
6602 | // | |||
6603 | // C++ [class.mem]p14: | |||
6604 | // In addition, if class T has a user-declared constructor (12.1), every | |||
6605 | // non-static data member of class T shall have a name different from T. | |||
6606 | DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); | |||
6607 | for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; | |||
6608 | ++I) { | |||
6609 | NamedDecl *D = (*I)->getUnderlyingDecl(); | |||
6610 | if (((isa<FieldDecl>(D) || isa<UnresolvedUsingValueDecl>(D)) && | |||
6611 | Record->hasUserDeclaredConstructor()) || | |||
6612 | isa<IndirectFieldDecl>(D)) { | |||
6613 | Diag((*I)->getLocation(), diag::err_member_name_of_class) | |||
6614 | << D->getDeclName(); | |||
6615 | break; | |||
6616 | } | |||
6617 | } | |||
6618 | } | |||
6619 | ||||
6620 | // Warn if the class has virtual methods but non-virtual public destructor. | |||
6621 | if (Record->isPolymorphic() && !Record->isDependentType()) { | |||
6622 | CXXDestructorDecl *dtor = Record->getDestructor(); | |||
6623 | if ((!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) && | |||
6624 | !Record->hasAttr<FinalAttr>()) | |||
6625 | Diag(dtor ? dtor->getLocation() : Record->getLocation(), | |||
6626 | diag::warn_non_virtual_dtor) << Context.getRecordType(Record); | |||
6627 | } | |||
6628 | ||||
6629 | if (Record->isAbstract()) { | |||
6630 | if (FinalAttr *FA = Record->getAttr<FinalAttr>()) { | |||
6631 | Diag(Record->getLocation(), diag::warn_abstract_final_class) | |||
6632 | << FA->isSpelledAsSealed(); | |||
6633 | DiagnoseAbstractType(Record); | |||
6634 | } | |||
6635 | } | |||
6636 | ||||
6637 | // Warn if the class has a final destructor but is not itself marked final. | |||
6638 | if (!Record->hasAttr<FinalAttr>()) { | |||
6639 | if (const CXXDestructorDecl *dtor = Record->getDestructor()) { | |||
6640 | if (const FinalAttr *FA = dtor->getAttr<FinalAttr>()) { | |||
6641 | Diag(FA->getLocation(), diag::warn_final_dtor_non_final_class) | |||
6642 | << FA->isSpelledAsSealed() | |||
6643 | << FixItHint::CreateInsertion( | |||
6644 | getLocForEndOfToken(Record->getLocation()), | |||
6645 | (FA->isSpelledAsSealed() ? " sealed" : " final")); | |||
6646 | Diag(Record->getLocation(), | |||
6647 | diag::note_final_dtor_non_final_class_silence) | |||
6648 | << Context.getRecordType(Record) << FA->isSpelledAsSealed(); | |||
6649 | } | |||
6650 | } | |||
6651 | } | |||
6652 | ||||
6653 | // See if trivial_abi has to be dropped. | |||
6654 | if (Record->hasAttr<TrivialABIAttr>()) | |||
6655 | checkIllFormedTrivialABIStruct(*Record); | |||
6656 | ||||
6657 | // Set HasTrivialSpecialMemberForCall if the record has attribute | |||
6658 | // "trivial_abi". | |||
6659 | bool HasTrivialABI = Record->hasAttr<TrivialABIAttr>(); | |||
6660 | ||||
6661 | if (HasTrivialABI) | |||
6662 | Record->setHasTrivialSpecialMemberForCall(); | |||
6663 | ||||
6664 | // Explicitly-defaulted secondary comparison functions (!=, <, <=, >, >=). | |||
6665 | // We check these last because they can depend on the properties of the | |||
6666 | // primary comparison functions (==, <=>). | |||
6667 | llvm::SmallVector<FunctionDecl*, 5> DefaultedSecondaryComparisons; | |||
6668 | ||||
6669 | // Perform checks that can't be done until we know all the properties of a | |||
6670 | // member function (whether it's defaulted, deleted, virtual, overriding, | |||
6671 | // ...). | |||
6672 | auto CheckCompletedMemberFunction = [&](CXXMethodDecl *MD) { | |||
6673 | // A static function cannot override anything. | |||
6674 | if (MD->getStorageClass() == SC_Static) { | |||
6675 | if (ReportOverrides(*this, diag::err_static_overrides_virtual, MD, | |||
6676 | [](const CXXMethodDecl *) { return true; })) | |||
6677 | return; | |||
6678 | } | |||
6679 | ||||
6680 | // A deleted function cannot override a non-deleted function and vice | |||
6681 | // versa. | |||
6682 | if (ReportOverrides(*this, | |||
6683 | MD->isDeleted() ? diag::err_deleted_override | |||
6684 | : diag::err_non_deleted_override, | |||
6685 | MD, [&](const CXXMethodDecl *V) { | |||
6686 | return MD->isDeleted() != V->isDeleted(); | |||
6687 | })) { | |||
6688 | if (MD->isDefaulted() && MD->isDeleted()) | |||
6689 | // Explain why this defaulted function was deleted. | |||
6690 | DiagnoseDeletedDefaultedFunction(MD); | |||
6691 | return; | |||
6692 | } | |||
6693 | ||||
6694 | // A consteval function cannot override a non-consteval function and vice | |||
6695 | // versa. | |||
6696 | if (ReportOverrides(*this, | |||
6697 | MD->isConsteval() ? diag::err_consteval_override | |||
6698 | : diag::err_non_consteval_override, | |||
6699 | MD, [&](const CXXMethodDecl *V) { | |||
6700 | return MD->isConsteval() != V->isConsteval(); | |||
6701 | })) { | |||
6702 | if (MD->isDefaulted() && MD->isDeleted()) | |||
6703 | // Explain why this defaulted function was deleted. | |||
6704 | DiagnoseDeletedDefaultedFunction(MD); | |||
6705 | return; | |||
6706 | } | |||
6707 | }; | |||
6708 | ||||
6709 | auto CheckForDefaultedFunction = [&](FunctionDecl *FD) -> bool { | |||
6710 | if (!FD || FD->isInvalidDecl() || !FD->isExplicitlyDefaulted()) | |||
6711 | return false; | |||
6712 | ||||
6713 | DefaultedFunctionKind DFK = getDefaultedFunctionKind(FD); | |||
6714 | if (DFK.asComparison() == DefaultedComparisonKind::NotEqual || | |||
6715 | DFK.asComparison() == DefaultedComparisonKind::Relational) { | |||
6716 | DefaultedSecondaryComparisons.push_back(FD); | |||
6717 | return true; | |||
6718 | } | |||
6719 | ||||
6720 | CheckExplicitlyDefaultedFunction(S, FD); | |||
6721 | return false; | |||
6722 | }; | |||
6723 | ||||
6724 | auto CompleteMemberFunction = [&](CXXMethodDecl *M) { | |||
6725 | // Check whether the explicitly-defaulted members are valid. | |||
6726 | bool Incomplete = CheckForDefaultedFunction(M); | |||
6727 | ||||
6728 | // Skip the rest of the checks for a member of a dependent class. | |||
6729 | if (Record->isDependentType()) | |||
6730 | return; | |||
6731 | ||||
6732 | // For an explicitly defaulted or deleted special member, we defer | |||
6733 | // determining triviality until the class is complete. That time is now! | |||
6734 | CXXSpecialMember CSM = getSpecialMember(M); | |||
6735 | if (!M->isImplicit() && !M->isUserProvided()) { | |||
6736 | if (CSM != CXXInvalid) { | |||
6737 | M->setTrivial(SpecialMemberIsTrivial(M, CSM)); | |||
6738 | // Inform the class that we've finished declaring this member. | |||
6739 | Record->finishedDefaultedOrDeletedMember(M); | |||
6740 | M->setTrivialForCall( | |||
6741 | HasTrivialABI || | |||
6742 | SpecialMemberIsTrivial(M, CSM, TAH_ConsiderTrivialABI)); | |||
6743 | Record->setTrivialForCallFlags(M); | |||
6744 | } | |||
6745 | } | |||
6746 | ||||
6747 | // Set triviality for the purpose of calls if this is a user-provided | |||
6748 | // copy/move constructor or destructor. | |||
6749 | if ((CSM == CXXCopyConstructor || CSM == CXXMoveConstructor || | |||
6750 | CSM == CXXDestructor) && M->isUserProvided()) { | |||
6751 | M->setTrivialForCall(HasTrivialABI); | |||
6752 | Record->setTrivialForCallFlags(M); | |||
6753 | } | |||
6754 | ||||
6755 | if (!M->isInvalidDecl() && M->isExplicitlyDefaulted() && | |||
6756 | M->hasAttr<DLLExportAttr>()) { | |||
6757 | if (getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015) && | |||
6758 | M->isTrivial() && | |||
6759 | (CSM == CXXDefaultConstructor || CSM == CXXCopyConstructor || | |||
6760 | CSM == CXXDestructor)) | |||
6761 | M->dropAttr<DLLExportAttr>(); | |||
6762 | ||||
6763 | if (M->hasAttr<DLLExportAttr>()) { | |||
6764 | // Define after any fields with in-class initializers have been parsed. | |||
6765 | DelayedDllExportMemberFunctions.push_back(M); | |||
6766 | } | |||
6767 | } | |||
6768 | ||||
6769 | // Define defaulted constexpr virtual functions that override a base class | |||
6770 | // function right away. | |||
6771 | // FIXME: We can defer doing this until the vtable is marked as used. | |||
6772 | if (M->isDefaulted() && M->isConstexpr() && M->size_overridden_methods()) | |||
6773 | DefineDefaultedFunction(*this, M, M->getLocation()); | |||
6774 | ||||
6775 | if (!Incomplete) | |||
6776 | CheckCompletedMemberFunction(M); | |||
6777 | }; | |||
6778 | ||||
6779 | // Check the destructor before any other member function. We need to | |||
6780 | // determine whether it's trivial in order to determine whether the claas | |||
6781 | // type is a literal type, which is a prerequisite for determining whether | |||
6782 | // other special member functions are valid and whether they're implicitly | |||
6783 | // 'constexpr'. | |||
6784 | if (CXXDestructorDecl *Dtor = Record->getDestructor()) | |||
6785 | CompleteMemberFunction(Dtor); | |||
6786 | ||||
6787 | bool HasMethodWithOverrideControl = false, | |||
6788 | HasOverridingMethodWithoutOverrideControl = false; | |||
6789 | for (auto *D : Record->decls()) { | |||
6790 | if (auto *M = dyn_cast<CXXMethodDecl>(D)) { | |||
6791 | // FIXME: We could do this check for dependent types with non-dependent | |||
6792 | // bases. | |||
6793 | if (!Record->isDependentType()) { | |||
6794 | // See if a method overloads virtual methods in a base | |||
6795 | // class without overriding any. | |||
6796 | if (!M->isStatic()) | |||
6797 | DiagnoseHiddenVirtualMethods(M); | |||
6798 | if (M->hasAttr<OverrideAttr>()) | |||
6799 | HasMethodWithOverrideControl = true; | |||
6800 | else if (M->size_overridden_methods() > 0) | |||
6801 | HasOverridingMethodWithoutOverrideControl = true; | |||
6802 | } | |||
6803 | ||||
6804 | if (!isa<CXXDestructorDecl>(M)) | |||
6805 | CompleteMemberFunction(M); | |||
6806 | } else if (auto *F = dyn_cast<FriendDecl>(D)) { | |||
6807 | CheckForDefaultedFunction( | |||
6808 | dyn_cast_or_null<FunctionDecl>(F->getFriendDecl())); | |||
6809 | } | |||
6810 | } | |||
6811 | ||||
6812 | if (HasOverridingMethodWithoutOverrideControl) { | |||
6813 | bool HasInconsistentOverrideControl = HasMethodWithOverrideControl; | |||
6814 | for (auto *M : Record->methods()) | |||
6815 | DiagnoseAbsenceOfOverrideControl(M, HasInconsistentOverrideControl); | |||
6816 | } | |||
6817 | ||||
6818 | // Check the defaulted secondary comparisons after any other member functions. | |||
6819 | for (FunctionDecl *FD : DefaultedSecondaryComparisons) { | |||
6820 | CheckExplicitlyDefaultedFunction(S, FD); | |||
6821 | ||||
6822 | // If this is a member function, we deferred checking it until now. | |||
6823 | if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) | |||
6824 | CheckCompletedMemberFunction(MD); | |||
6825 | } | |||
6826 | ||||
6827 | // ms_struct is a request to use the same ABI rules as MSVC. Check | |||
6828 | // whether this class uses any C++ features that are implemented | |||
6829 | // completely differently in MSVC, and if so, emit a diagnostic. | |||
6830 | // That diagnostic defaults to an error, but we allow projects to | |||
6831 | // map it down to a warning (or ignore it). It's a fairly common | |||
6832 | // practice among users of the ms_struct pragma to mass-annotate | |||
6833 | // headers, sweeping up a bunch of types that the project doesn't | |||
6834 | // really rely on MSVC-compatible layout for. We must therefore | |||
6835 | // support "ms_struct except for C++ stuff" as a secondary ABI. | |||
6836 | // Don't emit this diagnostic if the feature was enabled as a | |||
6837 | // language option (as opposed to via a pragma or attribute), as | |||
6838 | // the option -mms-bitfields otherwise essentially makes it impossible | |||
6839 | // to build C++ code, unless this diagnostic is turned off. | |||
6840 | if (Record->isMsStruct(Context) && !Context.getLangOpts().MSBitfields && | |||
6841 | (Record->isPolymorphic() || Record->getNumBases())) { | |||
6842 | Diag(Record->getLocation(), diag::warn_cxx_ms_struct); | |||
6843 | } | |||
6844 | ||||
6845 | checkClassLevelDLLAttribute(Record); | |||
6846 | checkClassLevelCodeSegAttribute(Record); | |||
6847 | ||||
6848 | bool ClangABICompat4 = | |||
6849 | Context.getLangOpts().getClangABICompat() <= LangOptions::ClangABI::Ver4; | |||
6850 | TargetInfo::CallingConvKind CCK = | |||
6851 | Context.getTargetInfo().getCallingConvKind(ClangABICompat4); | |||
6852 | bool CanPass = canPassInRegisters(*this, Record, CCK); | |||
6853 | ||||
6854 | // Do not change ArgPassingRestrictions if it has already been set to | |||
6855 | // APK_CanNeverPassInRegs. | |||
6856 | if (Record->getArgPassingRestrictions() != RecordDecl::APK_CanNeverPassInRegs) | |||
6857 | Record->setArgPassingRestrictions(CanPass | |||
6858 | ? RecordDecl::APK_CanPassInRegs | |||
6859 | : RecordDecl::APK_CannotPassInRegs); | |||
6860 | ||||
6861 | // If canPassInRegisters returns true despite the record having a non-trivial | |||
6862 | // destructor, the record is destructed in the callee. This happens only when | |||
6863 | // the record or one of its subobjects has a field annotated with trivial_abi | |||
6864 | // or a field qualified with ObjC __strong/__weak. | |||
6865 | if (Context.getTargetInfo().getCXXABI().areArgsDestroyedLeftToRightInCallee()) | |||
6866 | Record->setParamDestroyedInCallee(true); | |||
6867 | else if (Record->hasNonTrivialDestructor()) | |||
6868 | Record->setParamDestroyedInCallee(CanPass); | |||
6869 | ||||
6870 | if (getLangOpts().ForceEmitVTables) { | |||
6871 | // If we want to emit all the vtables, we need to mark it as used. This | |||
6872 | // is especially required for cases like vtable assumption loads. | |||
6873 | MarkVTableUsed(Record->getInnerLocStart(), Record); | |||
6874 | } | |||
6875 | ||||
6876 | if (getLangOpts().CUDA) { | |||
6877 | if (Record->hasAttr<CUDADeviceBuiltinSurfaceTypeAttr>()) | |||
6878 | checkCUDADeviceBuiltinSurfaceClassTemplate(*this, Record); | |||
6879 | else if (Record->hasAttr<CUDADeviceBuiltinTextureTypeAttr>()) | |||
6880 | checkCUDADeviceBuiltinTextureClassTemplate(*this, Record); | |||
6881 | } | |||
6882 | } | |||
6883 | ||||
6884 | /// Look up the special member function that would be called by a special | |||
6885 | /// member function for a subobject of class type. | |||
6886 | /// | |||
6887 | /// \param Class The class type of the subobject. | |||
6888 | /// \param CSM The kind of special member function. | |||
6889 | /// \param FieldQuals If the subobject is a field, its cv-qualifiers. | |||
6890 | /// \param ConstRHS True if this is a copy operation with a const object | |||
6891 | /// on its RHS, that is, if the argument to the outer special member | |||
6892 | /// function is 'const' and this is not a field marked 'mutable'. | |||
6893 | static Sema::SpecialMemberOverloadResult lookupCallFromSpecialMember( | |||
6894 | Sema &S, CXXRecordDecl *Class, Sema::CXXSpecialMember CSM, | |||
6895 | unsigned FieldQuals, bool ConstRHS) { | |||
6896 | unsigned LHSQuals = 0; | |||
6897 | if (CSM == Sema::CXXCopyAssignment || CSM == Sema::CXXMoveAssignment) | |||
6898 | LHSQuals = FieldQuals; | |||
6899 | ||||
6900 | unsigned RHSQuals = FieldQuals; | |||
6901 | if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) | |||
6902 | RHSQuals = 0; | |||
6903 | else if (ConstRHS) | |||
6904 | RHSQuals |= Qualifiers::Const; | |||
6905 | ||||
6906 | return S.LookupSpecialMember(Class, CSM, | |||
6907 | RHSQuals & Qualifiers::Const, | |||
6908 | RHSQuals & Qualifiers::Volatile, | |||
6909 | false, | |||
6910 | LHSQuals & Qualifiers::Const, | |||
6911 | LHSQuals & Qualifiers::Volatile); | |||
6912 | } | |||
6913 | ||||
6914 | class Sema::InheritedConstructorInfo { | |||
6915 | Sema &S; | |||
6916 | SourceLocation UseLoc; | |||
6917 | ||||
6918 | /// A mapping from the base classes through which the constructor was | |||
6919 | /// inherited to the using shadow declaration in that base class (or a null | |||
6920 | /// pointer if the constructor was declared in that base class). | |||
6921 | llvm::DenseMap<CXXRecordDecl *, ConstructorUsingShadowDecl *> | |||
6922 | InheritedFromBases; | |||
6923 | ||||
6924 | public: | |||
6925 | InheritedConstructorInfo(Sema &S, SourceLocation UseLoc, | |||
6926 | ConstructorUsingShadowDecl *Shadow) | |||
6927 | : S(S), UseLoc(UseLoc) { | |||
6928 | bool DiagnosedMultipleConstructedBases = false; | |||
6929 | CXXRecordDecl *ConstructedBase = nullptr; | |||
6930 | UsingDecl *ConstructedBaseUsing = nullptr; | |||
6931 | ||||
6932 | // Find the set of such base class subobjects and check that there's a | |||
6933 | // unique constructed subobject. | |||
6934 | for (auto *D : Shadow->redecls()) { | |||
6935 | auto *DShadow = cast<ConstructorUsingShadowDecl>(D); | |||
6936 | auto *DNominatedBase = DShadow->getNominatedBaseClass(); | |||
6937 | auto *DConstructedBase = DShadow->getConstructedBaseClass(); | |||
6938 | ||||
6939 | InheritedFromBases.insert( | |||
6940 | std::make_pair(DNominatedBase->getCanonicalDecl(), | |||
6941 | DShadow->getNominatedBaseClassShadowDecl())); | |||
6942 | if (DShadow->constructsVirtualBase()) | |||
6943 | InheritedFromBases.insert( | |||
6944 | std::make_pair(DConstructedBase->getCanonicalDecl(), | |||
6945 | DShadow->getConstructedBaseClassShadowDecl())); | |||
6946 | else | |||
6947 | assert(DNominatedBase == DConstructedBase)((DNominatedBase == DConstructedBase) ? static_cast<void> (0) : __assert_fail ("DNominatedBase == DConstructedBase", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 6947, __PRETTY_FUNCTION__)); | |||
6948 | ||||
6949 | // [class.inhctor.init]p2: | |||
6950 | // If the constructor was inherited from multiple base class subobjects | |||
6951 | // of type B, the program is ill-formed. | |||
6952 | if (!ConstructedBase) { | |||
6953 | ConstructedBase = DConstructedBase; | |||
6954 | ConstructedBaseUsing = D->getUsingDecl(); | |||
6955 | } else if (ConstructedBase != DConstructedBase && | |||
6956 | !Shadow->isInvalidDecl()) { | |||
6957 | if (!DiagnosedMultipleConstructedBases) { | |||
6958 | S.Diag(UseLoc, diag::err_ambiguous_inherited_constructor) | |||
6959 | << Shadow->getTargetDecl(); | |||
6960 | S.Diag(ConstructedBaseUsing->getLocation(), | |||
6961 | diag::note_ambiguous_inherited_constructor_using) | |||
6962 | << ConstructedBase; | |||
6963 | DiagnosedMultipleConstructedBases = true; | |||
6964 | } | |||
6965 | S.Diag(D->getUsingDecl()->getLocation(), | |||
6966 | diag::note_ambiguous_inherited_constructor_using) | |||
6967 | << DConstructedBase; | |||
6968 | } | |||
6969 | } | |||
6970 | ||||
6971 | if (DiagnosedMultipleConstructedBases) | |||
6972 | Shadow->setInvalidDecl(); | |||
6973 | } | |||
6974 | ||||
6975 | /// Find the constructor to use for inherited construction of a base class, | |||
6976 | /// and whether that base class constructor inherits the constructor from a | |||
6977 | /// virtual base class (in which case it won't actually invoke it). | |||
6978 | std::pair<CXXConstructorDecl *, bool> | |||
6979 | findConstructorForBase(CXXRecordDecl *Base, CXXConstructorDecl *Ctor) const { | |||
6980 | auto It = InheritedFromBases.find(Base->getCanonicalDecl()); | |||
6981 | if (It == InheritedFromBases.end()) | |||
6982 | return std::make_pair(nullptr, false); | |||
6983 | ||||
6984 | // This is an intermediary class. | |||
6985 | if (It->second) | |||
6986 | return std::make_pair( | |||
6987 | S.findInheritingConstructor(UseLoc, Ctor, It->second), | |||
6988 | It->second->constructsVirtualBase()); | |||
6989 | ||||
6990 | // This is the base class from which the constructor was inherited. | |||
6991 | return std::make_pair(Ctor, false); | |||
6992 | } | |||
6993 | }; | |||
6994 | ||||
6995 | /// Is the special member function which would be selected to perform the | |||
6996 | /// specified operation on the specified class type a constexpr constructor? | |||
6997 | static bool | |||
6998 | specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, | |||
6999 | Sema::CXXSpecialMember CSM, unsigned Quals, | |||
7000 | bool ConstRHS, | |||
7001 | CXXConstructorDecl *InheritedCtor = nullptr, | |||
7002 | Sema::InheritedConstructorInfo *Inherited = nullptr) { | |||
7003 | // If we're inheriting a constructor, see if we need to call it for this base | |||
7004 | // class. | |||
7005 | if (InheritedCtor) { | |||
7006 | assert(CSM == Sema::CXXDefaultConstructor)((CSM == Sema::CXXDefaultConstructor) ? static_cast<void> (0) : __assert_fail ("CSM == Sema::CXXDefaultConstructor", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 7006, __PRETTY_FUNCTION__)); | |||
7007 | auto BaseCtor = | |||
7008 | Inherited->findConstructorForBase(ClassDecl, InheritedCtor).first; | |||
7009 | if (BaseCtor) | |||
7010 | return BaseCtor->isConstexpr(); | |||
7011 | } | |||
7012 | ||||
7013 | if (CSM == Sema::CXXDefaultConstructor) | |||
7014 | return ClassDecl->hasConstexprDefaultConstructor(); | |||
7015 | if (CSM == Sema::CXXDestructor) | |||
7016 | return ClassDecl->hasConstexprDestructor(); | |||
7017 | ||||
7018 | Sema::SpecialMemberOverloadResult SMOR = | |||
7019 | lookupCallFromSpecialMember(S, ClassDecl, CSM, Quals, ConstRHS); | |||
7020 | if (!SMOR.getMethod()) | |||
7021 | // A constructor we wouldn't select can't be "involved in initializing" | |||
7022 | // anything. | |||
7023 | return true; | |||
7024 | return SMOR.getMethod()->isConstexpr(); | |||
7025 | } | |||
7026 | ||||
7027 | /// Determine whether the specified special member function would be constexpr | |||
7028 | /// if it were implicitly defined. | |||
7029 | static bool defaultedSpecialMemberIsConstexpr( | |||
7030 | Sema &S, CXXRecordDecl *ClassDecl, Sema::CXXSpecialMember CSM, | |||
7031 | bool ConstArg, CXXConstructorDecl *InheritedCtor = nullptr, | |||
7032 | Sema::InheritedConstructorInfo *Inherited = nullptr) { | |||
7033 | if (!S.getLangOpts().CPlusPlus11) | |||
7034 | return false; | |||
7035 | ||||
7036 | // C++11 [dcl.constexpr]p4: | |||
7037 | // In the definition of a constexpr constructor [...] | |||
7038 | bool Ctor = true; | |||
7039 | switch (CSM) { | |||
7040 | case Sema::CXXDefaultConstructor: | |||
7041 | if (Inherited) | |||
7042 | break; | |||
7043 | // Since default constructor lookup is essentially trivial (and cannot | |||
7044 | // involve, for instance, template instantiation), we compute whether a | |||
7045 | // defaulted default constructor is constexpr directly within CXXRecordDecl. | |||
7046 | // | |||
7047 | // This is important for performance; we need to know whether the default | |||
7048 | // constructor is constexpr to determine whether the type is a literal type. | |||
7049 | return ClassDecl->defaultedDefaultConstructorIsConstexpr(); | |||
7050 | ||||
7051 | case Sema::CXXCopyConstructor: | |||
7052 | case Sema::CXXMoveConstructor: | |||
7053 | // For copy or move constructors, we need to perform overload resolution. | |||
7054 | break; | |||
7055 | ||||
7056 | case Sema::CXXCopyAssignment: | |||
7057 | case Sema::CXXMoveAssignment: | |||
7058 | if (!S.getLangOpts().CPlusPlus14) | |||
7059 | return false; | |||
7060 | // In C++1y, we need to perform overload resolution. | |||
7061 | Ctor = false; | |||
7062 | break; | |||
7063 | ||||
7064 | case Sema::CXXDestructor: | |||
7065 | return ClassDecl->defaultedDestructorIsConstexpr(); | |||
7066 | ||||
7067 | case Sema::CXXInvalid: | |||
7068 | return false; | |||
7069 | } | |||
7070 | ||||
7071 | // -- if the class is a non-empty union, or for each non-empty anonymous | |||
7072 | // union member of a non-union class, exactly one non-static data member | |||
7073 | // shall be initialized; [DR1359] | |||
7074 | // | |||
7075 | // If we squint, this is guaranteed, since exactly one non-static data member | |||
7076 | // will be initialized (if the constructor isn't deleted), we just don't know | |||
7077 | // which one. | |||
7078 | if (Ctor && ClassDecl->isUnion()) | |||
7079 | return CSM == Sema::CXXDefaultConstructor | |||
7080 | ? ClassDecl->hasInClassInitializer() || | |||
7081 | !ClassDecl->hasVariantMembers() | |||
7082 | : true; | |||
7083 | ||||
7084 | // -- the class shall not have any virtual base classes; | |||
7085 | if (Ctor && ClassDecl->getNumVBases()) | |||
7086 | return false; | |||
7087 | ||||
7088 | // C++1y [class.copy]p26: | |||
7089 | // -- [the class] is a literal type, and | |||
7090 | if (!Ctor && !ClassDecl->isLiteral()) | |||
7091 | return false; | |||
7092 | ||||
7093 | // -- every constructor involved in initializing [...] base class | |||
7094 | // sub-objects shall be a constexpr constructor; | |||
7095 | // -- the assignment operator selected to copy/move each direct base | |||
7096 | // class is a constexpr function, and | |||
7097 | for (const auto &B : ClassDecl->bases()) { | |||
7098 | const RecordType *BaseType = B.getType()->getAs<RecordType>(); | |||
7099 | if (!BaseType) continue; | |||
7100 | ||||
7101 | CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); | |||
7102 | if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, 0, ConstArg, | |||
7103 | InheritedCtor, Inherited)) | |||
7104 | return false; | |||
7105 | } | |||
7106 | ||||
7107 | // -- every constructor involved in initializing non-static data members | |||
7108 | // [...] shall be a constexpr constructor; | |||
7109 | // -- every non-static data member and base class sub-object shall be | |||
7110 | // initialized | |||
7111 | // -- for each non-static data member of X that is of class type (or array | |||
7112 | // thereof), the assignment operator selected to copy/move that member is | |||
7113 | // a constexpr function | |||
7114 | for (const auto *F : ClassDecl->fields()) { | |||
7115 | if (F->isInvalidDecl()) | |||
7116 | continue; | |||
7117 | if (CSM == Sema::CXXDefaultConstructor && F->hasInClassInitializer()) | |||
7118 | continue; | |||
7119 | QualType BaseType = S.Context.getBaseElementType(F->getType()); | |||
7120 | if (const RecordType *RecordTy = BaseType->getAs<RecordType>()) { | |||
7121 | CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); | |||
7122 | if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, | |||
7123 | BaseType.getCVRQualifiers(), | |||
7124 | ConstArg && !F->isMutable())) | |||
7125 | return false; | |||
7126 | } else if (CSM == Sema::CXXDefaultConstructor) { | |||
7127 | return false; | |||
7128 | } | |||
7129 | } | |||
7130 | ||||
7131 | // All OK, it's constexpr! | |||
7132 | return true; | |||
7133 | } | |||
7134 | ||||
7135 | namespace { | |||
7136 | /// RAII object to register a defaulted function as having its exception | |||
7137 | /// specification computed. | |||
7138 | struct ComputingExceptionSpec { | |||
7139 | Sema &S; | |||
7140 | ||||
7141 | ComputingExceptionSpec(Sema &S, FunctionDecl *FD, SourceLocation Loc) | |||
7142 | : S(S) { | |||
7143 | Sema::CodeSynthesisContext Ctx; | |||
7144 | Ctx.Kind = Sema::CodeSynthesisContext::ExceptionSpecEvaluation; | |||
7145 | Ctx.PointOfInstantiation = Loc; | |||
7146 | Ctx.Entity = FD; | |||
7147 | S.pushCodeSynthesisContext(Ctx); | |||
7148 | } | |||
7149 | ~ComputingExceptionSpec() { | |||
7150 | S.popCodeSynthesisContext(); | |||
7151 | } | |||
7152 | }; | |||
7153 | } | |||
7154 | ||||
7155 | static Sema::ImplicitExceptionSpecification | |||
7156 | ComputeDefaultedSpecialMemberExceptionSpec( | |||
7157 | Sema &S, SourceLocation Loc, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM, | |||
7158 | Sema::InheritedConstructorInfo *ICI); | |||
7159 | ||||
7160 | static Sema::ImplicitExceptionSpecification | |||
7161 | ComputeDefaultedComparisonExceptionSpec(Sema &S, SourceLocation Loc, | |||
7162 | FunctionDecl *FD, | |||
7163 | Sema::DefaultedComparisonKind DCK); | |||
7164 | ||||
7165 | static Sema::ImplicitExceptionSpecification | |||
7166 | computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, FunctionDecl *FD) { | |||
7167 | auto DFK = S.getDefaultedFunctionKind(FD); | |||
7168 | if (DFK.isSpecialMember()) | |||
7169 | return ComputeDefaultedSpecialMemberExceptionSpec( | |||
7170 | S, Loc, cast<CXXMethodDecl>(FD), DFK.asSpecialMember(), nullptr); | |||
7171 | if (DFK.isComparison()) | |||
7172 | return ComputeDefaultedComparisonExceptionSpec(S, Loc, FD, | |||
7173 | DFK.asComparison()); | |||
7174 | ||||
7175 | auto *CD = cast<CXXConstructorDecl>(FD); | |||
7176 | assert(CD->getInheritedConstructor() &&((CD->getInheritedConstructor() && "only defaulted functions and inherited constructors have implicit " "exception specs") ? static_cast<void> (0) : __assert_fail ("CD->getInheritedConstructor() && \"only defaulted functions and inherited constructors have implicit \" \"exception specs\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 7178, __PRETTY_FUNCTION__)) | |||
7177 | "only defaulted functions and inherited constructors have implicit "((CD->getInheritedConstructor() && "only defaulted functions and inherited constructors have implicit " "exception specs") ? static_cast<void> (0) : __assert_fail ("CD->getInheritedConstructor() && \"only defaulted functions and inherited constructors have implicit \" \"exception specs\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 7178, __PRETTY_FUNCTION__)) | |||
7178 | "exception specs")((CD->getInheritedConstructor() && "only defaulted functions and inherited constructors have implicit " "exception specs") ? static_cast<void> (0) : __assert_fail ("CD->getInheritedConstructor() && \"only defaulted functions and inherited constructors have implicit \" \"exception specs\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 7178, __PRETTY_FUNCTION__)); | |||
7179 | Sema::InheritedConstructorInfo ICI( | |||
7180 | S, Loc, CD->getInheritedConstructor().getShadowDecl()); | |||
7181 | return ComputeDefaultedSpecialMemberExceptionSpec( | |||
7182 | S, Loc, CD, Sema::CXXDefaultConstructor, &ICI); | |||
7183 | } | |||
7184 | ||||
7185 | static FunctionProtoType::ExtProtoInfo getImplicitMethodEPI(Sema &S, | |||
7186 | CXXMethodDecl *MD) { | |||
7187 | FunctionProtoType::ExtProtoInfo EPI; | |||
7188 | ||||
7189 | // Build an exception specification pointing back at this member. | |||
7190 | EPI.ExceptionSpec.Type = EST_Unevaluated; | |||
7191 | EPI.ExceptionSpec.SourceDecl = MD; | |||
7192 | ||||
7193 | // Set the calling convention to the default for C++ instance methods. | |||
7194 | EPI.ExtInfo = EPI.ExtInfo.withCallingConv( | |||
7195 | S.Context.getDefaultCallingConvention(/*IsVariadic=*/false, | |||
7196 | /*IsCXXMethod=*/true)); | |||
7197 | return EPI; | |||
7198 | } | |||
7199 | ||||
7200 | void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, FunctionDecl *FD) { | |||
7201 | const FunctionProtoType *FPT = FD->getType()->castAs<FunctionProtoType>(); | |||
7202 | if (FPT->getExceptionSpecType() != EST_Unevaluated) | |||
7203 | return; | |||
7204 | ||||
7205 | // Evaluate the exception specification. | |||
7206 | auto IES = computeImplicitExceptionSpec(*this, Loc, FD); | |||
7207 | auto ESI = IES.getExceptionSpec(); | |||
7208 | ||||
7209 | // Update the type of the special member to use it. | |||
7210 | UpdateExceptionSpec(FD, ESI); | |||
7211 | } | |||
7212 | ||||
7213 | void Sema::CheckExplicitlyDefaultedFunction(Scope *S, FunctionDecl *FD) { | |||
7214 | assert(FD->isExplicitlyDefaulted() && "not explicitly-defaulted")((FD->isExplicitlyDefaulted() && "not explicitly-defaulted" ) ? static_cast<void> (0) : __assert_fail ("FD->isExplicitlyDefaulted() && \"not explicitly-defaulted\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 7214, __PRETTY_FUNCTION__)); | |||
7215 | ||||
7216 | DefaultedFunctionKind DefKind = getDefaultedFunctionKind(FD); | |||
7217 | if (!DefKind) { | |||
7218 | assert(FD->getDeclContext()->isDependentContext())((FD->getDeclContext()->isDependentContext()) ? static_cast <void> (0) : __assert_fail ("FD->getDeclContext()->isDependentContext()" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 7218, __PRETTY_FUNCTION__)); | |||
7219 | return; | |||
7220 | } | |||
7221 | ||||
7222 | if (DefKind.isSpecialMember() | |||
7223 | ? CheckExplicitlyDefaultedSpecialMember(cast<CXXMethodDecl>(FD), | |||
7224 | DefKind.asSpecialMember()) | |||
7225 | : CheckExplicitlyDefaultedComparison(S, FD, DefKind.asComparison())) | |||
7226 | FD->setInvalidDecl(); | |||
7227 | } | |||
7228 | ||||
7229 | bool Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD, | |||
7230 | CXXSpecialMember CSM) { | |||
7231 | CXXRecordDecl *RD = MD->getParent(); | |||
7232 | ||||
7233 | assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid &&((MD->isExplicitlyDefaulted() && CSM != CXXInvalid && "not an explicitly-defaulted special member") ? static_cast <void> (0) : __assert_fail ("MD->isExplicitlyDefaulted() && CSM != CXXInvalid && \"not an explicitly-defaulted special member\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 7234, __PRETTY_FUNCTION__)) | |||
7234 | "not an explicitly-defaulted special member")((MD->isExplicitlyDefaulted() && CSM != CXXInvalid && "not an explicitly-defaulted special member") ? static_cast <void> (0) : __assert_fail ("MD->isExplicitlyDefaulted() && CSM != CXXInvalid && \"not an explicitly-defaulted special member\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 7234, __PRETTY_FUNCTION__)); | |||
7235 | ||||
7236 | // Defer all checking for special members of a dependent type. | |||
7237 | if (RD->isDependentType()) | |||
7238 | return false; | |||
7239 | ||||
7240 | // Whether this was the first-declared instance of the constructor. | |||
7241 | // This affects whether we implicitly add an exception spec and constexpr. | |||
7242 | bool First = MD == MD->getCanonicalDecl(); | |||
7243 | ||||
7244 | bool HadError = false; | |||
7245 | ||||
7246 | // C++11 [dcl.fct.def.default]p1: | |||
7247 | // A function that is explicitly defaulted shall | |||
7248 | // -- be a special member function [...] (checked elsewhere), | |||
7249 | // -- have the same type (except for ref-qualifiers, and except that a | |||
7250 | // copy operation can take a non-const reference) as an implicit | |||
7251 | // declaration, and | |||
7252 | // -- not have default arguments. | |||
7253 | // C++2a changes the second bullet to instead delete the function if it's | |||
7254 | // defaulted on its first declaration, unless it's "an assignment operator, | |||
7255 | // and its return type differs or its parameter type is not a reference". | |||
7256 | bool DeleteOnTypeMismatch = getLangOpts().CPlusPlus20 && First; | |||
7257 | bool ShouldDeleteForTypeMismatch = false; | |||
7258 | unsigned ExpectedParams = 1; | |||
7259 | if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) | |||
7260 | ExpectedParams = 0; | |||
7261 | if (MD->getNumParams() != ExpectedParams) { | |||
7262 | // This checks for default arguments: a copy or move constructor with a | |||
7263 | // default argument is classified as a default constructor, and assignment | |||
7264 | // operations and destructors can't have default arguments. | |||
7265 | Diag(MD->getLocation(), diag::err_defaulted_special_member_params) | |||
7266 | << CSM << MD->getSourceRange(); | |||
7267 | HadError = true; | |||
7268 | } else if (MD->isVariadic()) { | |||
7269 | if (DeleteOnTypeMismatch) | |||
7270 | ShouldDeleteForTypeMismatch = true; | |||
7271 | else { | |||
7272 | Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic) | |||
7273 | << CSM << MD->getSourceRange(); | |||
7274 | HadError = true; | |||
7275 | } | |||
7276 | } | |||
7277 | ||||
7278 | const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); | |||
7279 | ||||
7280 | bool CanHaveConstParam = false; | |||
7281 | if (CSM == CXXCopyConstructor) | |||
7282 | CanHaveConstParam = RD->implicitCopyConstructorHasConstParam(); | |||
7283 | else if (CSM == CXXCopyAssignment) | |||
7284 | CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam(); | |||
7285 | ||||
7286 | QualType ReturnType = Context.VoidTy; | |||
7287 | if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { | |||
7288 | // Check for return type matching. | |||
7289 | ReturnType = Type->getReturnType(); | |||
7290 | ||||
7291 | QualType DeclType = Context.getTypeDeclType(RD); | |||
7292 | DeclType = Context.getAddrSpaceQualType(DeclType, MD->getMethodQualifiers().getAddressSpace()); | |||
7293 | QualType ExpectedReturnType = Context.getLValueReferenceType(DeclType); | |||
7294 | ||||
7295 | if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { | |||
7296 | Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) | |||
7297 | << (CSM == CXXMoveAssignment) << ExpectedReturnType; | |||
7298 | HadError = true; | |||
7299 | } | |||
7300 | ||||
7301 | // A defaulted special member cannot have cv-qualifiers. | |||
7302 | if (Type->getMethodQuals().hasConst() || Type->getMethodQuals().hasVolatile()) { | |||
7303 | if (DeleteOnTypeMismatch) | |||
7304 | ShouldDeleteForTypeMismatch = true; | |||
7305 | else { | |||
7306 | Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) | |||
7307 | << (CSM == CXXMoveAssignment) << getLangOpts().CPlusPlus14; | |||
7308 | HadError = true; | |||
7309 | } | |||
7310 | } | |||
7311 | } | |||
7312 | ||||
7313 | // Check for parameter type matching. | |||
7314 | QualType ArgType = ExpectedParams ? Type->getParamType(0) : QualType(); | |||
7315 | bool HasConstParam = false; | |||
7316 | if (ExpectedParams && ArgType->isReferenceType()) { | |||
7317 | // Argument must be reference to possibly-const T. | |||
7318 | QualType ReferentType = ArgType->getPointeeType(); | |||
7319 | HasConstParam = ReferentType.isConstQualified(); | |||
7320 | ||||
7321 | if (ReferentType.isVolatileQualified()) { | |||
7322 | if (DeleteOnTypeMismatch) | |||
7323 | ShouldDeleteForTypeMismatch = true; | |||
7324 | else { | |||
7325 | Diag(MD->getLocation(), | |||
7326 | diag::err_defaulted_special_member_volatile_param) << CSM; | |||
7327 | HadError = true; | |||
7328 | } | |||
7329 | } | |||
7330 | ||||
7331 | if (HasConstParam && !CanHaveConstParam) { | |||
7332 | if (DeleteOnTypeMismatch) | |||
7333 | ShouldDeleteForTypeMismatch = true; | |||
7334 | else if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { | |||
7335 | Diag(MD->getLocation(), | |||
7336 | diag::err_defaulted_special_member_copy_const_param) | |||
7337 | << (CSM == CXXCopyAssignment); | |||
7338 | // FIXME: Explain why this special member can't be const. | |||
7339 | HadError = true; | |||
7340 | } else { | |||
7341 | Diag(MD->getLocation(), | |||
7342 | diag::err_defaulted_special_member_move_const_param) | |||
7343 | << (CSM == CXXMoveAssignment); | |||
7344 | HadError = true; | |||
7345 | } | |||
7346 | } | |||
7347 | } else if (ExpectedParams) { | |||
7348 | // A copy assignment operator can take its argument by value, but a | |||
7349 | // defaulted one cannot. | |||
7350 | assert(CSM == CXXCopyAssignment && "unexpected non-ref argument")((CSM == CXXCopyAssignment && "unexpected non-ref argument" ) ? static_cast<void> (0) : __assert_fail ("CSM == CXXCopyAssignment && \"unexpected non-ref argument\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 7350, __PRETTY_FUNCTION__)); | |||
7351 | Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); | |||
7352 | HadError = true; | |||
7353 | } | |||
7354 | ||||
7355 | // C++11 [dcl.fct.def.default]p2: | |||
7356 | // An explicitly-defaulted function may be declared constexpr only if it | |||
7357 | // would have been implicitly declared as constexpr, | |||
7358 | // Do not apply this rule to members of class templates, since core issue 1358 | |||
7359 | // makes such functions always instantiate to constexpr functions. For | |||
7360 | // functions which cannot be constexpr (for non-constructors in C++11 and for | |||
7361 | // destructors in C++14 and C++17), this is checked elsewhere. | |||
7362 | // | |||
7363 | // FIXME: This should not apply if the member is deleted. | |||
7364 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, | |||
7365 | HasConstParam); | |||
7366 | if ((getLangOpts().CPlusPlus20 || | |||
7367 | (getLangOpts().CPlusPlus14 ? !isa<CXXDestructorDecl>(MD) | |||
7368 | : isa<CXXConstructorDecl>(MD))) && | |||
7369 | MD->isConstexpr() && !Constexpr && | |||
7370 | MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { | |||
7371 | Diag(MD->getBeginLoc(), MD->isConsteval() | |||
7372 | ? diag::err_incorrect_defaulted_consteval | |||
7373 | : diag::err_incorrect_defaulted_constexpr) | |||
7374 | << CSM; | |||
7375 | // FIXME: Explain why the special member can't be constexpr. | |||
7376 | HadError = true; | |||
7377 | } | |||
7378 | ||||
7379 | if (First) { | |||
7380 | // C++2a [dcl.fct.def.default]p3: | |||
7381 | // If a function is explicitly defaulted on its first declaration, it is | |||
7382 | // implicitly considered to be constexpr if the implicit declaration | |||
7383 | // would be. | |||
7384 | MD->setConstexprKind(Constexpr ? (MD->isConsteval() | |||
7385 | ? ConstexprSpecKind::Consteval | |||
7386 | : ConstexprSpecKind::Constexpr) | |||
7387 | : ConstexprSpecKind::Unspecified); | |||
7388 | ||||
7389 | if (!Type->hasExceptionSpec()) { | |||
7390 | // C++2a [except.spec]p3: | |||
7391 | // If a declaration of a function does not have a noexcept-specifier | |||
7392 | // [and] is defaulted on its first declaration, [...] the exception | |||
7393 | // specification is as specified below | |||
7394 | FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); | |||
7395 | EPI.ExceptionSpec.Type = EST_Unevaluated; | |||
7396 | EPI.ExceptionSpec.SourceDecl = MD; | |||
7397 | MD->setType(Context.getFunctionType(ReturnType, | |||
7398 | llvm::makeArrayRef(&ArgType, | |||
7399 | ExpectedParams), | |||
7400 | EPI)); | |||
7401 | } | |||
7402 | } | |||
7403 | ||||
7404 | if (ShouldDeleteForTypeMismatch || ShouldDeleteSpecialMember(MD, CSM)) { | |||
7405 | if (First) { | |||
7406 | SetDeclDeleted(MD, MD->getLocation()); | |||
7407 | if (!inTemplateInstantiation() && !HadError) { | |||
7408 | Diag(MD->getLocation(), diag::warn_defaulted_method_deleted) << CSM; | |||
7409 | if (ShouldDeleteForTypeMismatch) { | |||
7410 | Diag(MD->getLocation(), diag::note_deleted_type_mismatch) << CSM; | |||
7411 | } else { | |||
7412 | ShouldDeleteSpecialMember(MD, CSM, nullptr, /*Diagnose*/true); | |||
7413 | } | |||
7414 | } | |||
7415 | if (ShouldDeleteForTypeMismatch && !HadError) { | |||
7416 | Diag(MD->getLocation(), | |||
7417 | diag::warn_cxx17_compat_defaulted_method_type_mismatch) << CSM; | |||
7418 | } | |||
7419 | } else { | |||
7420 | // C++11 [dcl.fct.def.default]p4: | |||
7421 | // [For a] user-provided explicitly-defaulted function [...] if such a | |||
7422 | // function is implicitly defined as deleted, the program is ill-formed. | |||
7423 | Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; | |||
7424 | assert(!ShouldDeleteForTypeMismatch && "deleted non-first decl")((!ShouldDeleteForTypeMismatch && "deleted non-first decl" ) ? static_cast<void> (0) : __assert_fail ("!ShouldDeleteForTypeMismatch && \"deleted non-first decl\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 7424, __PRETTY_FUNCTION__)); | |||
7425 | ShouldDeleteSpecialMember(MD, CSM, nullptr, /*Diagnose*/true); | |||
7426 | HadError = true; | |||
7427 | } | |||
7428 | } | |||
7429 | ||||
7430 | return HadError; | |||
7431 | } | |||
7432 | ||||
7433 | namespace { | |||
7434 | /// Helper class for building and checking a defaulted comparison. | |||
7435 | /// | |||
7436 | /// Defaulted functions are built in two phases: | |||
7437 | /// | |||
7438 | /// * First, the set of operations that the function will perform are | |||
7439 | /// identified, and some of them are checked. If any of the checked | |||
7440 | /// operations is invalid in certain ways, the comparison function is | |||
7441 | /// defined as deleted and no body is built. | |||
7442 | /// * Then, if the function is not defined as deleted, the body is built. | |||
7443 | /// | |||
7444 | /// This is accomplished by performing two visitation steps over the eventual | |||
7445 | /// body of the function. | |||
7446 | template<typename Derived, typename ResultList, typename Result, | |||
7447 | typename Subobject> | |||
7448 | class DefaultedComparisonVisitor { | |||
7449 | public: | |||
7450 | using DefaultedComparisonKind = Sema::DefaultedComparisonKind; | |||
7451 | ||||
7452 | DefaultedComparisonVisitor(Sema &S, CXXRecordDecl *RD, FunctionDecl *FD, | |||
7453 | DefaultedComparisonKind DCK) | |||
7454 | : S(S), RD(RD), FD(FD), DCK(DCK) { | |||
7455 | if (auto *Info = FD->getDefaultedFunctionInfo()) { | |||
7456 | // FIXME: Change CreateOverloadedBinOp to take an ArrayRef instead of an | |||
7457 | // UnresolvedSet to avoid this copy. | |||
7458 | Fns.assign(Info->getUnqualifiedLookups().begin(), | |||
7459 | Info->getUnqualifiedLookups().end()); | |||
7460 | } | |||
7461 | } | |||
7462 | ||||
7463 | ResultList visit() { | |||
7464 | // The type of an lvalue naming a parameter of this function. | |||
7465 | QualType ParamLvalType = | |||
7466 | FD->getParamDecl(0)->getType().getNonReferenceType(); | |||
7467 | ||||
7468 | ResultList Results; | |||
7469 | ||||
7470 | switch (DCK) { | |||
7471 | case DefaultedComparisonKind::None: | |||
7472 | llvm_unreachable("not a defaulted comparison")::llvm::llvm_unreachable_internal("not a defaulted comparison" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 7472); | |||
7473 | ||||
7474 | case DefaultedComparisonKind::Equal: | |||
7475 | case DefaultedComparisonKind::ThreeWay: | |||
7476 | getDerived().visitSubobjects(Results, RD, ParamLvalType.getQualifiers()); | |||
7477 | return Results; | |||
7478 | ||||
7479 | case DefaultedComparisonKind::NotEqual: | |||
7480 | case DefaultedComparisonKind::Relational: | |||
7481 | Results.add(getDerived().visitExpandedSubobject( | |||
7482 | ParamLvalType, getDerived().getCompleteObject())); | |||
7483 | return Results; | |||
7484 | } | |||
7485 | llvm_unreachable("")::llvm::llvm_unreachable_internal("", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 7485); | |||
7486 | } | |||
7487 | ||||
7488 | protected: | |||
7489 | Derived &getDerived() { return static_cast<Derived&>(*this); } | |||
7490 | ||||
7491 | /// Visit the expanded list of subobjects of the given type, as specified in | |||
7492 | /// C++2a [class.compare.default]. | |||
7493 | /// | |||
7494 | /// \return \c true if the ResultList object said we're done, \c false if not. | |||
7495 | bool visitSubobjects(ResultList &Results, CXXRecordDecl *Record, | |||
7496 | Qualifiers Quals) { | |||
7497 | // C++2a [class.compare.default]p4: | |||
7498 | // The direct base class subobjects of C | |||
7499 | for (CXXBaseSpecifier &Base : Record->bases()) | |||
7500 | if (Results.add(getDerived().visitSubobject( | |||
7501 | S.Context.getQualifiedType(Base.getType(), Quals), | |||
7502 | getDerived().getBase(&Base)))) | |||
7503 | return true; | |||
7504 | ||||
7505 | // followed by the non-static data members of C | |||
7506 | for (FieldDecl *Field : Record->fields()) { | |||
7507 | // Recursively expand anonymous structs. | |||
7508 | if (Field->isAnonymousStructOrUnion()) { | |||
7509 | if (visitSubobjects(Results, Field->getType()->getAsCXXRecordDecl(), | |||
7510 | Quals)) | |||
7511 | return true; | |||
7512 | continue; | |||
7513 | } | |||
7514 | ||||
7515 | // Figure out the type of an lvalue denoting this field. | |||
7516 | Qualifiers FieldQuals = Quals; | |||
7517 | if (Field->isMutable()) | |||
7518 | FieldQuals.removeConst(); | |||
7519 | QualType FieldType = | |||
7520 | S.Context.getQualifiedType(Field->getType(), FieldQuals); | |||
7521 | ||||
7522 | if (Results.add(getDerived().visitSubobject( | |||
7523 | FieldType, getDerived().getField(Field)))) | |||
7524 | return true; | |||
7525 | } | |||
7526 | ||||
7527 | // form a list of subobjects. | |||
7528 | return false; | |||
7529 | } | |||
7530 | ||||
7531 | Result visitSubobject(QualType Type, Subobject Subobj) { | |||
7532 | // In that list, any subobject of array type is recursively expanded | |||
7533 | const ArrayType *AT = S.Context.getAsArrayType(Type); | |||
7534 | if (auto *CAT = dyn_cast_or_null<ConstantArrayType>(AT)) | |||
7535 | return getDerived().visitSubobjectArray(CAT->getElementType(), | |||
7536 | CAT->getSize(), Subobj); | |||
7537 | return getDerived().visitExpandedSubobject(Type, Subobj); | |||
7538 | } | |||
7539 | ||||
7540 | Result visitSubobjectArray(QualType Type, const llvm::APInt &Size, | |||
7541 | Subobject Subobj) { | |||
7542 | return getDerived().visitSubobject(Type, Subobj); | |||
7543 | } | |||
7544 | ||||
7545 | protected: | |||
7546 | Sema &S; | |||
7547 | CXXRecordDecl *RD; | |||
7548 | FunctionDecl *FD; | |||
7549 | DefaultedComparisonKind DCK; | |||
7550 | UnresolvedSet<16> Fns; | |||
7551 | }; | |||
7552 | ||||
7553 | /// Information about a defaulted comparison, as determined by | |||
7554 | /// DefaultedComparisonAnalyzer. | |||
7555 | struct DefaultedComparisonInfo { | |||
7556 | bool Deleted = false; | |||
7557 | bool Constexpr = true; | |||
7558 | ComparisonCategoryType Category = ComparisonCategoryType::StrongOrdering; | |||
7559 | ||||
7560 | static DefaultedComparisonInfo deleted() { | |||
7561 | DefaultedComparisonInfo Deleted; | |||
7562 | Deleted.Deleted = true; | |||
7563 | return Deleted; | |||
7564 | } | |||
7565 | ||||
7566 | bool add(const DefaultedComparisonInfo &R) { | |||
7567 | Deleted |= R.Deleted; | |||
7568 | Constexpr &= R.Constexpr; | |||
7569 | Category = commonComparisonType(Category, R.Category); | |||
7570 | return Deleted; | |||
7571 | } | |||
7572 | }; | |||
7573 | ||||
7574 | /// An element in the expanded list of subobjects of a defaulted comparison, as | |||
7575 | /// specified in C++2a [class.compare.default]p4. | |||
7576 | struct DefaultedComparisonSubobject { | |||
7577 | enum { CompleteObject, Member, Base } Kind; | |||
7578 | NamedDecl *Decl; | |||
7579 | SourceLocation Loc; | |||
7580 | }; | |||
7581 | ||||
7582 | /// A visitor over the notional body of a defaulted comparison that determines | |||
7583 | /// whether that body would be deleted or constexpr. | |||
7584 | class DefaultedComparisonAnalyzer | |||
7585 | : public DefaultedComparisonVisitor<DefaultedComparisonAnalyzer, | |||
7586 | DefaultedComparisonInfo, | |||
7587 | DefaultedComparisonInfo, | |||
7588 | DefaultedComparisonSubobject> { | |||
7589 | public: | |||
7590 | enum DiagnosticKind { NoDiagnostics, ExplainDeleted, ExplainConstexpr }; | |||
7591 | ||||
7592 | private: | |||
7593 | DiagnosticKind Diagnose; | |||
7594 | ||||
7595 | public: | |||
7596 | using Base = DefaultedComparisonVisitor; | |||
7597 | using Result = DefaultedComparisonInfo; | |||
7598 | using Subobject = DefaultedComparisonSubobject; | |||
7599 | ||||
7600 | friend Base; | |||
7601 | ||||
7602 | DefaultedComparisonAnalyzer(Sema &S, CXXRecordDecl *RD, FunctionDecl *FD, | |||
7603 | DefaultedComparisonKind DCK, | |||
7604 | DiagnosticKind Diagnose = NoDiagnostics) | |||
7605 | : Base(S, RD, FD, DCK), Diagnose(Diagnose) {} | |||
7606 | ||||
7607 | Result visit() { | |||
7608 | if ((DCK == DefaultedComparisonKind::Equal || | |||
7609 | DCK == DefaultedComparisonKind::ThreeWay) && | |||
7610 | RD->hasVariantMembers()) { | |||
7611 | // C++2a [class.compare.default]p2 [P2002R0]: | |||
7612 | // A defaulted comparison operator function for class C is defined as | |||
7613 | // deleted if [...] C has variant members. | |||
7614 | if (Diagnose == ExplainDeleted) { | |||
7615 | S.Diag(FD->getLocation(), diag::note_defaulted_comparison_union) | |||
7616 | << FD << RD->isUnion() << RD; | |||
7617 | } | |||
7618 | return Result::deleted(); | |||
7619 | } | |||
7620 | ||||
7621 | return Base::visit(); | |||
7622 | } | |||
7623 | ||||
7624 | private: | |||
7625 | Subobject getCompleteObject() { | |||
7626 | return Subobject{Subobject::CompleteObject, nullptr, FD->getLocation()}; | |||
7627 | } | |||
7628 | ||||
7629 | Subobject getBase(CXXBaseSpecifier *Base) { | |||
7630 | return Subobject{Subobject::Base, Base->getType()->getAsCXXRecordDecl(), | |||
7631 | Base->getBaseTypeLoc()}; | |||
7632 | } | |||
7633 | ||||
7634 | Subobject getField(FieldDecl *Field) { | |||
7635 | return Subobject{Subobject::Member, Field, Field->getLocation()}; | |||
7636 | } | |||
7637 | ||||
7638 | Result visitExpandedSubobject(QualType Type, Subobject Subobj) { | |||
7639 | // C++2a [class.compare.default]p2 [P2002R0]: | |||
7640 | // A defaulted <=> or == operator function for class C is defined as | |||
7641 | // deleted if any non-static data member of C is of reference type | |||
7642 | if (Type->isReferenceType()) { | |||
7643 | if (Diagnose == ExplainDeleted) { | |||
7644 | S.Diag(Subobj.Loc, diag::note_defaulted_comparison_reference_member) | |||
7645 | << FD << RD; | |||
7646 | } | |||
7647 | return Result::deleted(); | |||
7648 | } | |||
7649 | ||||
7650 | // [...] Let xi be an lvalue denoting the ith element [...] | |||
7651 | OpaqueValueExpr Xi(FD->getLocation(), Type, VK_LValue); | |||
7652 | Expr *Args[] = {&Xi, &Xi}; | |||
7653 | ||||
7654 | // All operators start by trying to apply that same operator recursively. | |||
7655 | OverloadedOperatorKind OO = FD->getOverloadedOperator(); | |||
7656 | assert(OO != OO_None && "not an overloaded operator!")((OO != OO_None && "not an overloaded operator!") ? static_cast <void> (0) : __assert_fail ("OO != OO_None && \"not an overloaded operator!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 7656, __PRETTY_FUNCTION__)); | |||
7657 | return visitBinaryOperator(OO, Args, Subobj); | |||
7658 | } | |||
7659 | ||||
7660 | Result | |||
7661 | visitBinaryOperator(OverloadedOperatorKind OO, ArrayRef<Expr *> Args, | |||
7662 | Subobject Subobj, | |||
7663 | OverloadCandidateSet *SpaceshipCandidates = nullptr) { | |||
7664 | // Note that there is no need to consider rewritten candidates here if | |||
7665 | // we've already found there is no viable 'operator<=>' candidate (and are | |||
7666 | // considering synthesizing a '<=>' from '==' and '<'). | |||
7667 | OverloadCandidateSet CandidateSet( | |||
7668 | FD->getLocation(), OverloadCandidateSet::CSK_Operator, | |||
7669 | OverloadCandidateSet::OperatorRewriteInfo( | |||
7670 | OO, /*AllowRewrittenCandidates=*/!SpaceshipCandidates)); | |||
7671 | ||||
7672 | /// C++2a [class.compare.default]p1 [P2002R0]: | |||
7673 | /// [...] the defaulted function itself is never a candidate for overload | |||
7674 | /// resolution [...] | |||
7675 | CandidateSet.exclude(FD); | |||
7676 | ||||
7677 | if (Args[0]->getType()->isOverloadableType()) | |||
7678 | S.LookupOverloadedBinOp(CandidateSet, OO, Fns, Args); | |||
7679 | else { | |||
7680 | // FIXME: We determine whether this is a valid expression by checking to | |||
7681 | // see if there's a viable builtin operator candidate for it. That isn't | |||
7682 | // really what the rules ask us to do, but should give the right results. | |||
7683 | S.AddBuiltinOperatorCandidates(OO, FD->getLocation(), Args, CandidateSet); | |||
7684 | } | |||
7685 | ||||
7686 | Result R; | |||
7687 | ||||
7688 | OverloadCandidateSet::iterator Best; | |||
7689 | switch (CandidateSet.BestViableFunction(S, FD->getLocation(), Best)) { | |||
7690 | case OR_Success: { | |||
7691 | // C++2a [class.compare.secondary]p2 [P2002R0]: | |||
7692 | // The operator function [...] is defined as deleted if [...] the | |||
7693 | // candidate selected by overload resolution is not a rewritten | |||
7694 | // candidate. | |||
7695 | if ((DCK == DefaultedComparisonKind::NotEqual || | |||
7696 | DCK == DefaultedComparisonKind::Relational) && | |||
7697 | !Best->RewriteKind) { | |||
7698 | if (Diagnose == ExplainDeleted) { | |||
7699 | S.Diag(Best->Function->getLocation(), | |||
7700 | diag::note_defaulted_comparison_not_rewritten_callee) | |||
7701 | << FD; | |||
7702 | } | |||
7703 | return Result::deleted(); | |||
7704 | } | |||
7705 | ||||
7706 | // Throughout C++2a [class.compare]: if overload resolution does not | |||
7707 | // result in a usable function, the candidate function is defined as | |||
7708 | // deleted. This requires that we selected an accessible function. | |||
7709 | // | |||
7710 | // Note that this only considers the access of the function when named | |||
7711 | // within the type of the subobject, and not the access path for any | |||
7712 | // derived-to-base conversion. | |||
7713 | CXXRecordDecl *ArgClass = Args[0]->getType()->getAsCXXRecordDecl(); | |||
7714 | if (ArgClass && Best->FoundDecl.getDecl() && | |||
7715 | Best->FoundDecl.getDecl()->isCXXClassMember()) { | |||
7716 | QualType ObjectType = Subobj.Kind == Subobject::Member | |||
7717 | ? Args[0]->getType() | |||
7718 | : S.Context.getRecordType(RD); | |||
7719 | if (!S.isMemberAccessibleForDeletion( | |||
7720 | ArgClass, Best->FoundDecl, ObjectType, Subobj.Loc, | |||
7721 | Diagnose == ExplainDeleted | |||
7722 | ? S.PDiag(diag::note_defaulted_comparison_inaccessible) | |||
7723 | << FD << Subobj.Kind << Subobj.Decl | |||
7724 | : S.PDiag())) | |||
7725 | return Result::deleted(); | |||
7726 | } | |||
7727 | ||||
7728 | // C++2a [class.compare.default]p3 [P2002R0]: | |||
7729 | // A defaulted comparison function is constexpr-compatible if [...] | |||
7730 | // no overlod resolution performed [...] results in a non-constexpr | |||
7731 | // function. | |||
7732 | if (FunctionDecl *BestFD = Best->Function) { | |||
7733 | assert(!BestFD->isDeleted() && "wrong overload resolution result")((!BestFD->isDeleted() && "wrong overload resolution result" ) ? static_cast<void> (0) : __assert_fail ("!BestFD->isDeleted() && \"wrong overload resolution result\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 7733, __PRETTY_FUNCTION__)); | |||
7734 | // If it's not constexpr, explain why not. | |||
7735 | if (Diagnose == ExplainConstexpr && !BestFD->isConstexpr()) { | |||
7736 | if (Subobj.Kind != Subobject::CompleteObject) | |||
7737 | S.Diag(Subobj.Loc, diag::note_defaulted_comparison_not_constexpr) | |||
7738 | << Subobj.Kind << Subobj.Decl; | |||
7739 | S.Diag(BestFD->getLocation(), | |||
7740 | diag::note_defaulted_comparison_not_constexpr_here); | |||
7741 | // Bail out after explaining; we don't want any more notes. | |||
7742 | return Result::deleted(); | |||
7743 | } | |||
7744 | R.Constexpr &= BestFD->isConstexpr(); | |||
7745 | } | |||
7746 | ||||
7747 | if (OO == OO_Spaceship && FD->getReturnType()->isUndeducedAutoType()) { | |||
7748 | if (auto *BestFD = Best->Function) { | |||
7749 | // If any callee has an undeduced return type, deduce it now. | |||
7750 | // FIXME: It's not clear how a failure here should be handled. For | |||
7751 | // now, we produce an eager diagnostic, because that is forward | |||
7752 | // compatible with most (all?) other reasonable options. | |||
7753 | if (BestFD->getReturnType()->isUndeducedType() && | |||
7754 | S.DeduceReturnType(BestFD, FD->getLocation(), | |||
7755 | /*Diagnose=*/false)) { | |||
7756 | // Don't produce a duplicate error when asked to explain why the | |||
7757 | // comparison is deleted: we diagnosed that when initially checking | |||
7758 | // the defaulted operator. | |||
7759 | if (Diagnose == NoDiagnostics) { | |||
7760 | S.Diag( | |||
7761 | FD->getLocation(), | |||
7762 | diag::err_defaulted_comparison_cannot_deduce_undeduced_auto) | |||
7763 | << Subobj.Kind << Subobj.Decl; | |||
7764 | S.Diag( | |||
7765 | Subobj.Loc, | |||
7766 | diag::note_defaulted_comparison_cannot_deduce_undeduced_auto) | |||
7767 | << Subobj.Kind << Subobj.Decl; | |||
7768 | S.Diag(BestFD->getLocation(), | |||
7769 | diag::note_defaulted_comparison_cannot_deduce_callee) | |||
7770 | << Subobj.Kind << Subobj.Decl; | |||
7771 | } | |||
7772 | return Result::deleted(); | |||
7773 | } | |||
7774 | if (auto *Info = S.Context.CompCategories.lookupInfoForType( | |||
7775 | BestFD->getCallResultType())) { | |||
7776 | R.Category = Info->Kind; | |||
7777 | } else { | |||
7778 | if (Diagnose == ExplainDeleted) { | |||
7779 | S.Diag(Subobj.Loc, diag::note_defaulted_comparison_cannot_deduce) | |||
7780 | << Subobj.Kind << Subobj.Decl | |||
7781 | << BestFD->getCallResultType().withoutLocalFastQualifiers(); | |||
7782 | S.Diag(BestFD->getLocation(), | |||
7783 | diag::note_defaulted_comparison_cannot_deduce_callee) | |||
7784 | << Subobj.Kind << Subobj.Decl; | |||
7785 | } | |||
7786 | return Result::deleted(); | |||
7787 | } | |||
7788 | } else { | |||
7789 | Optional<ComparisonCategoryType> Cat = | |||
7790 | getComparisonCategoryForBuiltinCmp(Args[0]->getType()); | |||
7791 | assert(Cat && "no category for builtin comparison?")((Cat && "no category for builtin comparison?") ? static_cast <void> (0) : __assert_fail ("Cat && \"no category for builtin comparison?\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 7791, __PRETTY_FUNCTION__)); | |||
7792 | R.Category = *Cat; | |||
7793 | } | |||
7794 | } | |||
7795 | ||||
7796 | // Note that we might be rewriting to a different operator. That call is | |||
7797 | // not considered until we come to actually build the comparison function. | |||
7798 | break; | |||
7799 | } | |||
7800 | ||||
7801 | case OR_Ambiguous: | |||
7802 | if (Diagnose == ExplainDeleted) { | |||
7803 | unsigned Kind = 0; | |||
7804 | if (FD->getOverloadedOperator() == OO_Spaceship && OO != OO_Spaceship) | |||
7805 | Kind = OO == OO_EqualEqual ? 1 : 2; | |||
7806 | CandidateSet.NoteCandidates( | |||
7807 | PartialDiagnosticAt( | |||
7808 | Subobj.Loc, S.PDiag(diag::note_defaulted_comparison_ambiguous) | |||
7809 | << FD << Kind << Subobj.Kind << Subobj.Decl), | |||
7810 | S, OCD_AmbiguousCandidates, Args); | |||
7811 | } | |||
7812 | R = Result::deleted(); | |||
7813 | break; | |||
7814 | ||||
7815 | case OR_Deleted: | |||
7816 | if (Diagnose == ExplainDeleted) { | |||
7817 | if ((DCK == DefaultedComparisonKind::NotEqual || | |||
7818 | DCK == DefaultedComparisonKind::Relational) && | |||
7819 | !Best->RewriteKind) { | |||
7820 | S.Diag(Best->Function->getLocation(), | |||
7821 | diag::note_defaulted_comparison_not_rewritten_callee) | |||
7822 | << FD; | |||
7823 | } else { | |||
7824 | S.Diag(Subobj.Loc, | |||
7825 | diag::note_defaulted_comparison_calls_deleted) | |||
7826 | << FD << Subobj.Kind << Subobj.Decl; | |||
7827 | S.NoteDeletedFunction(Best->Function); | |||
7828 | } | |||
7829 | } | |||
7830 | R = Result::deleted(); | |||
7831 | break; | |||
7832 | ||||
7833 | case OR_No_Viable_Function: | |||
7834 | // If there's no usable candidate, we're done unless we can rewrite a | |||
7835 | // '<=>' in terms of '==' and '<'. | |||
7836 | if (OO == OO_Spaceship && | |||
7837 | S.Context.CompCategories.lookupInfoForType(FD->getReturnType())) { | |||
7838 | // For any kind of comparison category return type, we need a usable | |||
7839 | // '==' and a usable '<'. | |||
7840 | if (!R.add(visitBinaryOperator(OO_EqualEqual, Args, Subobj, | |||
7841 | &CandidateSet))) | |||
7842 | R.add(visitBinaryOperator(OO_Less, Args, Subobj, &CandidateSet)); | |||
7843 | break; | |||
7844 | } | |||
7845 | ||||
7846 | if (Diagnose == ExplainDeleted) { | |||
7847 | S.Diag(Subobj.Loc, diag::note_defaulted_comparison_no_viable_function) | |||
7848 | << FD << Subobj.Kind << Subobj.Decl; | |||
7849 | ||||
7850 | // For a three-way comparison, list both the candidates for the | |||
7851 | // original operator and the candidates for the synthesized operator. | |||
7852 | if (SpaceshipCandidates) { | |||
7853 | SpaceshipCandidates->NoteCandidates( | |||
7854 | S, Args, | |||
7855 | SpaceshipCandidates->CompleteCandidates(S, OCD_AllCandidates, | |||
7856 | Args, FD->getLocation())); | |||
7857 | S.Diag(Subobj.Loc, | |||
7858 | diag::note_defaulted_comparison_no_viable_function_synthesized) | |||
7859 | << (OO == OO_EqualEqual ? 0 : 1); | |||
7860 | } | |||
7861 | ||||
7862 | CandidateSet.NoteCandidates( | |||
7863 | S, Args, | |||
7864 | CandidateSet.CompleteCandidates(S, OCD_AllCandidates, Args, | |||
7865 | FD->getLocation())); | |||
7866 | } | |||
7867 | R = Result::deleted(); | |||
7868 | break; | |||
7869 | } | |||
7870 | ||||
7871 | return R; | |||
7872 | } | |||
7873 | }; | |||
7874 | ||||
7875 | /// A list of statements. | |||
7876 | struct StmtListResult { | |||
7877 | bool IsInvalid = false; | |||
7878 | llvm::SmallVector<Stmt*, 16> Stmts; | |||
7879 | ||||
7880 | bool add(const StmtResult &S) { | |||
7881 | IsInvalid |= S.isInvalid(); | |||
7882 | if (IsInvalid) | |||
7883 | return true; | |||
7884 | Stmts.push_back(S.get()); | |||
7885 | return false; | |||
7886 | } | |||
7887 | }; | |||
7888 | ||||
7889 | /// A visitor over the notional body of a defaulted comparison that synthesizes | |||
7890 | /// the actual body. | |||
7891 | class DefaultedComparisonSynthesizer | |||
7892 | : public DefaultedComparisonVisitor<DefaultedComparisonSynthesizer, | |||
7893 | StmtListResult, StmtResult, | |||
7894 | std::pair<ExprResult, ExprResult>> { | |||
7895 | SourceLocation Loc; | |||
7896 | unsigned ArrayDepth = 0; | |||
7897 | ||||
7898 | public: | |||
7899 | using Base = DefaultedComparisonVisitor; | |||
7900 | using ExprPair = std::pair<ExprResult, ExprResult>; | |||
7901 | ||||
7902 | friend Base; | |||
7903 | ||||
7904 | DefaultedComparisonSynthesizer(Sema &S, CXXRecordDecl *RD, FunctionDecl *FD, | |||
7905 | DefaultedComparisonKind DCK, | |||
7906 | SourceLocation BodyLoc) | |||
7907 | : Base(S, RD, FD, DCK), Loc(BodyLoc) {} | |||
7908 | ||||
7909 | /// Build a suitable function body for this defaulted comparison operator. | |||
7910 | StmtResult build() { | |||
7911 | Sema::CompoundScopeRAII CompoundScope(S); | |||
7912 | ||||
7913 | StmtListResult Stmts = visit(); | |||
7914 | if (Stmts.IsInvalid) | |||
7915 | return StmtError(); | |||
7916 | ||||
7917 | ExprResult RetVal; | |||
7918 | switch (DCK) { | |||
7919 | case DefaultedComparisonKind::None: | |||
7920 | llvm_unreachable("not a defaulted comparison")::llvm::llvm_unreachable_internal("not a defaulted comparison" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 7920); | |||
7921 | ||||
7922 | case DefaultedComparisonKind::Equal: { | |||
7923 | // C++2a [class.eq]p3: | |||
7924 | // [...] compar[e] the corresponding elements [...] until the first | |||
7925 | // index i where xi == yi yields [...] false. If no such index exists, | |||
7926 | // V is true. Otherwise, V is false. | |||
7927 | // | |||
7928 | // Join the comparisons with '&&'s and return the result. Use a right | |||
7929 | // fold (traversing the conditions right-to-left), because that | |||
7930 | // short-circuits more naturally. | |||
7931 | auto OldStmts = std::move(Stmts.Stmts); | |||
7932 | Stmts.Stmts.clear(); | |||
7933 | ExprResult CmpSoFar; | |||
7934 | // Finish a particular comparison chain. | |||
7935 | auto FinishCmp = [&] { | |||
7936 | if (Expr *Prior = CmpSoFar.get()) { | |||
7937 | // Convert the last expression to 'return ...;' | |||
7938 | if (RetVal.isUnset() && Stmts.Stmts.empty()) | |||
7939 | RetVal = CmpSoFar; | |||
7940 | // Convert any prior comparison to 'if (!(...)) return false;' | |||
7941 | else if (Stmts.add(buildIfNotCondReturnFalse(Prior))) | |||
7942 | return true; | |||
7943 | CmpSoFar = ExprResult(); | |||
7944 | } | |||
7945 | return false; | |||
7946 | }; | |||
7947 | for (Stmt *EAsStmt : llvm::reverse(OldStmts)) { | |||
7948 | Expr *E = dyn_cast<Expr>(EAsStmt); | |||
7949 | if (!E) { | |||
7950 | // Found an array comparison. | |||
7951 | if (FinishCmp() || Stmts.add(EAsStmt)) | |||
7952 | return StmtError(); | |||
7953 | continue; | |||
7954 | } | |||
7955 | ||||
7956 | if (CmpSoFar.isUnset()) { | |||
7957 | CmpSoFar = E; | |||
7958 | continue; | |||
7959 | } | |||
7960 | CmpSoFar = S.CreateBuiltinBinOp(Loc, BO_LAnd, E, CmpSoFar.get()); | |||
7961 | if (CmpSoFar.isInvalid()) | |||
7962 | return StmtError(); | |||
7963 | } | |||
7964 | if (FinishCmp()) | |||
7965 | return StmtError(); | |||
7966 | std::reverse(Stmts.Stmts.begin(), Stmts.Stmts.end()); | |||
7967 | // If no such index exists, V is true. | |||
7968 | if (RetVal.isUnset()) | |||
7969 | RetVal = S.ActOnCXXBoolLiteral(Loc, tok::kw_true); | |||
7970 | break; | |||
7971 | } | |||
7972 | ||||
7973 | case DefaultedComparisonKind::ThreeWay: { | |||
7974 | // Per C++2a [class.spaceship]p3, as a fallback add: | |||
7975 | // return static_cast<R>(std::strong_ordering::equal); | |||
7976 | QualType StrongOrdering = S.CheckComparisonCategoryType( | |||
7977 | ComparisonCategoryType::StrongOrdering, Loc, | |||
7978 | Sema::ComparisonCategoryUsage::DefaultedOperator); | |||
7979 | if (StrongOrdering.isNull()) | |||
7980 | return StmtError(); | |||
7981 | VarDecl *EqualVD = S.Context.CompCategories.getInfoForType(StrongOrdering) | |||
7982 | .getValueInfo(ComparisonCategoryResult::Equal) | |||
7983 | ->VD; | |||
7984 | RetVal = getDecl(EqualVD); | |||
7985 | if (RetVal.isInvalid()) | |||
7986 | return StmtError(); | |||
7987 | RetVal = buildStaticCastToR(RetVal.get()); | |||
7988 | break; | |||
7989 | } | |||
7990 | ||||
7991 | case DefaultedComparisonKind::NotEqual: | |||
7992 | case DefaultedComparisonKind::Relational: | |||
7993 | RetVal = cast<Expr>(Stmts.Stmts.pop_back_val()); | |||
7994 | break; | |||
7995 | } | |||
7996 | ||||
7997 | // Build the final return statement. | |||
7998 | if (RetVal.isInvalid()) | |||
7999 | return StmtError(); | |||
8000 | StmtResult ReturnStmt = S.BuildReturnStmt(Loc, RetVal.get()); | |||
8001 | if (ReturnStmt.isInvalid()) | |||
8002 | return StmtError(); | |||
8003 | Stmts.Stmts.push_back(ReturnStmt.get()); | |||
8004 | ||||
8005 | return S.ActOnCompoundStmt(Loc, Loc, Stmts.Stmts, /*IsStmtExpr=*/false); | |||
8006 | } | |||
8007 | ||||
8008 | private: | |||
8009 | ExprResult getDecl(ValueDecl *VD) { | |||
8010 | return S.BuildDeclarationNameExpr( | |||
8011 | CXXScopeSpec(), DeclarationNameInfo(VD->getDeclName(), Loc), VD); | |||
8012 | } | |||
8013 | ||||
8014 | ExprResult getParam(unsigned I) { | |||
8015 | ParmVarDecl *PD = FD->getParamDecl(I); | |||
8016 | return getDecl(PD); | |||
8017 | } | |||
8018 | ||||
8019 | ExprPair getCompleteObject() { | |||
8020 | unsigned Param = 0; | |||
8021 | ExprResult LHS; | |||
8022 | if (isa<CXXMethodDecl>(FD)) { | |||
8023 | // LHS is '*this'. | |||
8024 | LHS = S.ActOnCXXThis(Loc); | |||
8025 | if (!LHS.isInvalid()) | |||
8026 | LHS = S.CreateBuiltinUnaryOp(Loc, UO_Deref, LHS.get()); | |||
8027 | } else { | |||
8028 | LHS = getParam(Param++); | |||
8029 | } | |||
8030 | ExprResult RHS = getParam(Param++); | |||
8031 | assert(Param == FD->getNumParams())((Param == FD->getNumParams()) ? static_cast<void> ( 0) : __assert_fail ("Param == FD->getNumParams()", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 8031, __PRETTY_FUNCTION__)); | |||
8032 | return {LHS, RHS}; | |||
8033 | } | |||
8034 | ||||
8035 | ExprPair getBase(CXXBaseSpecifier *Base) { | |||
8036 | ExprPair Obj = getCompleteObject(); | |||
8037 | if (Obj.first.isInvalid() || Obj.second.isInvalid()) | |||
8038 | return {ExprError(), ExprError()}; | |||
8039 | CXXCastPath Path = {Base}; | |||
8040 | return {S.ImpCastExprToType(Obj.first.get(), Base->getType(), | |||
8041 | CK_DerivedToBase, VK_LValue, &Path), | |||
8042 | S.ImpCastExprToType(Obj.second.get(), Base->getType(), | |||
8043 | CK_DerivedToBase, VK_LValue, &Path)}; | |||
8044 | } | |||
8045 | ||||
8046 | ExprPair getField(FieldDecl *Field) { | |||
8047 | ExprPair Obj = getCompleteObject(); | |||
8048 | if (Obj.first.isInvalid() || Obj.second.isInvalid()) | |||
8049 | return {ExprError(), ExprError()}; | |||
8050 | ||||
8051 | DeclAccessPair Found = DeclAccessPair::make(Field, Field->getAccess()); | |||
8052 | DeclarationNameInfo NameInfo(Field->getDeclName(), Loc); | |||
8053 | return {S.BuildFieldReferenceExpr(Obj.first.get(), /*IsArrow=*/false, Loc, | |||
8054 | CXXScopeSpec(), Field, Found, NameInfo), | |||
8055 | S.BuildFieldReferenceExpr(Obj.second.get(), /*IsArrow=*/false, Loc, | |||
8056 | CXXScopeSpec(), Field, Found, NameInfo)}; | |||
8057 | } | |||
8058 | ||||
8059 | // FIXME: When expanding a subobject, register a note in the code synthesis | |||
8060 | // stack to say which subobject we're comparing. | |||
8061 | ||||
8062 | StmtResult buildIfNotCondReturnFalse(ExprResult Cond) { | |||
8063 | if (Cond.isInvalid()) | |||
8064 | return StmtError(); | |||
8065 | ||||
8066 | ExprResult NotCond = S.CreateBuiltinUnaryOp(Loc, UO_LNot, Cond.get()); | |||
8067 | if (NotCond.isInvalid()) | |||
8068 | return StmtError(); | |||
8069 | ||||
8070 | ExprResult False = S.ActOnCXXBoolLiteral(Loc, tok::kw_false); | |||
8071 | assert(!False.isInvalid() && "should never fail")((!False.isInvalid() && "should never fail") ? static_cast <void> (0) : __assert_fail ("!False.isInvalid() && \"should never fail\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 8071, __PRETTY_FUNCTION__)); | |||
8072 | StmtResult ReturnFalse = S.BuildReturnStmt(Loc, False.get()); | |||
8073 | if (ReturnFalse.isInvalid()) | |||
8074 | return StmtError(); | |||
8075 | ||||
8076 | return S.ActOnIfStmt(Loc, false, Loc, nullptr, | |||
8077 | S.ActOnCondition(nullptr, Loc, NotCond.get(), | |||
8078 | Sema::ConditionKind::Boolean), | |||
8079 | Loc, ReturnFalse.get(), SourceLocation(), nullptr); | |||
8080 | } | |||
8081 | ||||
8082 | StmtResult visitSubobjectArray(QualType Type, llvm::APInt Size, | |||
8083 | ExprPair Subobj) { | |||
8084 | QualType SizeType = S.Context.getSizeType(); | |||
8085 | Size = Size.zextOrTrunc(S.Context.getTypeSize(SizeType)); | |||
8086 | ||||
8087 | // Build 'size_t i$n = 0'. | |||
8088 | IdentifierInfo *IterationVarName = nullptr; | |||
8089 | { | |||
8090 | SmallString<8> Str; | |||
8091 | llvm::raw_svector_ostream OS(Str); | |||
8092 | OS << "i" << ArrayDepth; | |||
8093 | IterationVarName = &S.Context.Idents.get(OS.str()); | |||
8094 | } | |||
8095 | VarDecl *IterationVar = VarDecl::Create( | |||
8096 | S.Context, S.CurContext, Loc, Loc, IterationVarName, SizeType, | |||
8097 | S.Context.getTrivialTypeSourceInfo(SizeType, Loc), SC_None); | |||
8098 | llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); | |||
8099 | IterationVar->setInit( | |||
8100 | IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); | |||
8101 | Stmt *Init = new (S.Context) DeclStmt(DeclGroupRef(IterationVar), Loc, Loc); | |||
8102 | ||||
8103 | auto IterRef = [&] { | |||
8104 | ExprResult Ref = S.BuildDeclarationNameExpr( | |||
8105 | CXXScopeSpec(), DeclarationNameInfo(IterationVarName, Loc), | |||
8106 | IterationVar); | |||
8107 | assert(!Ref.isInvalid() && "can't reference our own variable?")((!Ref.isInvalid() && "can't reference our own variable?" ) ? static_cast<void> (0) : __assert_fail ("!Ref.isInvalid() && \"can't reference our own variable?\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 8107, __PRETTY_FUNCTION__)); | |||
8108 | return Ref.get(); | |||
8109 | }; | |||
8110 | ||||
8111 | // Build 'i$n != Size'. | |||
8112 | ExprResult Cond = S.CreateBuiltinBinOp( | |||
8113 | Loc, BO_NE, IterRef(), | |||
8114 | IntegerLiteral::Create(S.Context, Size, SizeType, Loc)); | |||
8115 | assert(!Cond.isInvalid() && "should never fail")((!Cond.isInvalid() && "should never fail") ? static_cast <void> (0) : __assert_fail ("!Cond.isInvalid() && \"should never fail\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 8115, __PRETTY_FUNCTION__)); | |||
8116 | ||||
8117 | // Build '++i$n'. | |||
8118 | ExprResult Inc = S.CreateBuiltinUnaryOp(Loc, UO_PreInc, IterRef()); | |||
8119 | assert(!Inc.isInvalid() && "should never fail")((!Inc.isInvalid() && "should never fail") ? static_cast <void> (0) : __assert_fail ("!Inc.isInvalid() && \"should never fail\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 8119, __PRETTY_FUNCTION__)); | |||
8120 | ||||
8121 | // Build 'a[i$n]' and 'b[i$n]'. | |||
8122 | auto Index = [&](ExprResult E) { | |||
8123 | if (E.isInvalid()) | |||
8124 | return ExprError(); | |||
8125 | return S.CreateBuiltinArraySubscriptExpr(E.get(), Loc, IterRef(), Loc); | |||
8126 | }; | |||
8127 | Subobj.first = Index(Subobj.first); | |||
8128 | Subobj.second = Index(Subobj.second); | |||
8129 | ||||
8130 | // Compare the array elements. | |||
8131 | ++ArrayDepth; | |||
8132 | StmtResult Substmt = visitSubobject(Type, Subobj); | |||
8133 | --ArrayDepth; | |||
8134 | ||||
8135 | if (Substmt.isInvalid()) | |||
8136 | return StmtError(); | |||
8137 | ||||
8138 | // For the inner level of an 'operator==', build 'if (!cmp) return false;'. | |||
8139 | // For outer levels or for an 'operator<=>' we already have a suitable | |||
8140 | // statement that returns as necessary. | |||
8141 | if (Expr *ElemCmp = dyn_cast<Expr>(Substmt.get())) { | |||
8142 | assert(DCK == DefaultedComparisonKind::Equal &&((DCK == DefaultedComparisonKind::Equal && "should have non-expression statement" ) ? static_cast<void> (0) : __assert_fail ("DCK == DefaultedComparisonKind::Equal && \"should have non-expression statement\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 8143, __PRETTY_FUNCTION__)) | |||
8143 | "should have non-expression statement")((DCK == DefaultedComparisonKind::Equal && "should have non-expression statement" ) ? static_cast<void> (0) : __assert_fail ("DCK == DefaultedComparisonKind::Equal && \"should have non-expression statement\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 8143, __PRETTY_FUNCTION__)); | |||
8144 | Substmt = buildIfNotCondReturnFalse(ElemCmp); | |||
8145 | if (Substmt.isInvalid()) | |||
8146 | return StmtError(); | |||
8147 | } | |||
8148 | ||||
8149 | // Build 'for (...) ...' | |||
8150 | return S.ActOnForStmt(Loc, Loc, Init, | |||
8151 | S.ActOnCondition(nullptr, Loc, Cond.get(), | |||
8152 | Sema::ConditionKind::Boolean), | |||
8153 | S.MakeFullDiscardedValueExpr(Inc.get()), Loc, | |||
8154 | Substmt.get()); | |||
8155 | } | |||
8156 | ||||
8157 | StmtResult visitExpandedSubobject(QualType Type, ExprPair Obj) { | |||
8158 | if (Obj.first.isInvalid() || Obj.second.isInvalid()) | |||
8159 | return StmtError(); | |||
8160 | ||||
8161 | OverloadedOperatorKind OO = FD->getOverloadedOperator(); | |||
8162 | BinaryOperatorKind Opc = BinaryOperator::getOverloadedOpcode(OO); | |||
8163 | ExprResult Op; | |||
8164 | if (Type->isOverloadableType()) | |||
8165 | Op = S.CreateOverloadedBinOp(Loc, Opc, Fns, Obj.first.get(), | |||
8166 | Obj.second.get(), /*PerformADL=*/true, | |||
8167 | /*AllowRewrittenCandidates=*/true, FD); | |||
8168 | else | |||
8169 | Op = S.CreateBuiltinBinOp(Loc, Opc, Obj.first.get(), Obj.second.get()); | |||
8170 | if (Op.isInvalid()) | |||
8171 | return StmtError(); | |||
8172 | ||||
8173 | switch (DCK) { | |||
8174 | case DefaultedComparisonKind::None: | |||
8175 | llvm_unreachable("not a defaulted comparison")::llvm::llvm_unreachable_internal("not a defaulted comparison" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 8175); | |||
8176 | ||||
8177 | case DefaultedComparisonKind::Equal: | |||
8178 | // Per C++2a [class.eq]p2, each comparison is individually contextually | |||
8179 | // converted to bool. | |||
8180 | Op = S.PerformContextuallyConvertToBool(Op.get()); | |||
8181 | if (Op.isInvalid()) | |||
8182 | return StmtError(); | |||
8183 | return Op.get(); | |||
8184 | ||||
8185 | case DefaultedComparisonKind::ThreeWay: { | |||
8186 | // Per C++2a [class.spaceship]p3, form: | |||
8187 | // if (R cmp = static_cast<R>(op); cmp != 0) | |||
8188 | // return cmp; | |||
8189 | QualType R = FD->getReturnType(); | |||
8190 | Op = buildStaticCastToR(Op.get()); | |||
8191 | if (Op.isInvalid()) | |||
8192 | return StmtError(); | |||
8193 | ||||
8194 | // R cmp = ...; | |||
8195 | IdentifierInfo *Name = &S.Context.Idents.get("cmp"); | |||
8196 | VarDecl *VD = | |||
8197 | VarDecl::Create(S.Context, S.CurContext, Loc, Loc, Name, R, | |||
8198 | S.Context.getTrivialTypeSourceInfo(R, Loc), SC_None); | |||
8199 | S.AddInitializerToDecl(VD, Op.get(), /*DirectInit=*/false); | |||
8200 | Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(VD), Loc, Loc); | |||
8201 | ||||
8202 | // cmp != 0 | |||
8203 | ExprResult VDRef = getDecl(VD); | |||
8204 | if (VDRef.isInvalid()) | |||
8205 | return StmtError(); | |||
8206 | llvm::APInt ZeroVal(S.Context.getIntWidth(S.Context.IntTy), 0); | |||
8207 | Expr *Zero = | |||
8208 | IntegerLiteral::Create(S.Context, ZeroVal, S.Context.IntTy, Loc); | |||
8209 | ExprResult Comp; | |||
8210 | if (VDRef.get()->getType()->isOverloadableType()) | |||
8211 | Comp = S.CreateOverloadedBinOp(Loc, BO_NE, Fns, VDRef.get(), Zero, true, | |||
8212 | true, FD); | |||
8213 | else | |||
8214 | Comp = S.CreateBuiltinBinOp(Loc, BO_NE, VDRef.get(), Zero); | |||
8215 | if (Comp.isInvalid()) | |||
8216 | return StmtError(); | |||
8217 | Sema::ConditionResult Cond = S.ActOnCondition( | |||
8218 | nullptr, Loc, Comp.get(), Sema::ConditionKind::Boolean); | |||
8219 | if (Cond.isInvalid()) | |||
8220 | return StmtError(); | |||
8221 | ||||
8222 | // return cmp; | |||
8223 | VDRef = getDecl(VD); | |||
8224 | if (VDRef.isInvalid()) | |||
8225 | return StmtError(); | |||
8226 | StmtResult ReturnStmt = S.BuildReturnStmt(Loc, VDRef.get()); | |||
8227 | if (ReturnStmt.isInvalid()) | |||
8228 | return StmtError(); | |||
8229 | ||||
8230 | // if (...) | |||
8231 | return S.ActOnIfStmt(Loc, /*IsConstexpr=*/false, Loc, InitStmt, Cond, Loc, | |||
8232 | ReturnStmt.get(), | |||
8233 | /*ElseLoc=*/SourceLocation(), /*Else=*/nullptr); | |||
8234 | } | |||
8235 | ||||
8236 | case DefaultedComparisonKind::NotEqual: | |||
8237 | case DefaultedComparisonKind::Relational: | |||
8238 | // C++2a [class.compare.secondary]p2: | |||
8239 | // Otherwise, the operator function yields x @ y. | |||
8240 | return Op.get(); | |||
8241 | } | |||
8242 | llvm_unreachable("")::llvm::llvm_unreachable_internal("", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 8242); | |||
8243 | } | |||
8244 | ||||
8245 | /// Build "static_cast<R>(E)". | |||
8246 | ExprResult buildStaticCastToR(Expr *E) { | |||
8247 | QualType R = FD->getReturnType(); | |||
8248 | assert(!R->isUndeducedType() && "type should have been deduced already")((!R->isUndeducedType() && "type should have been deduced already" ) ? static_cast<void> (0) : __assert_fail ("!R->isUndeducedType() && \"type should have been deduced already\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 8248, __PRETTY_FUNCTION__)); | |||
8249 | ||||
8250 | // Don't bother forming a no-op cast in the common case. | |||
8251 | if (E->isRValue() && S.Context.hasSameType(E->getType(), R)) | |||
8252 | return E; | |||
8253 | return S.BuildCXXNamedCast(Loc, tok::kw_static_cast, | |||
8254 | S.Context.getTrivialTypeSourceInfo(R, Loc), E, | |||
8255 | SourceRange(Loc, Loc), SourceRange(Loc, Loc)); | |||
8256 | } | |||
8257 | }; | |||
8258 | } | |||
8259 | ||||
8260 | /// Perform the unqualified lookups that might be needed to form a defaulted | |||
8261 | /// comparison function for the given operator. | |||
8262 | static void lookupOperatorsForDefaultedComparison(Sema &Self, Scope *S, | |||
8263 | UnresolvedSetImpl &Operators, | |||
8264 | OverloadedOperatorKind Op) { | |||
8265 | auto Lookup = [&](OverloadedOperatorKind OO) { | |||
8266 | Self.LookupOverloadedOperatorName(OO, S, Operators); | |||
8267 | }; | |||
8268 | ||||
8269 | // Every defaulted operator looks up itself. | |||
8270 | Lookup(Op); | |||
8271 | // ... and the rewritten form of itself, if any. | |||
8272 | if (OverloadedOperatorKind ExtraOp = getRewrittenOverloadedOperator(Op)) | |||
8273 | Lookup(ExtraOp); | |||
8274 | ||||
8275 | // For 'operator<=>', we also form a 'cmp != 0' expression, and might | |||
8276 | // synthesize a three-way comparison from '<' and '=='. In a dependent | |||
8277 | // context, we also need to look up '==' in case we implicitly declare a | |||
8278 | // defaulted 'operator=='. | |||
8279 | if (Op == OO_Spaceship) { | |||
8280 | Lookup(OO_ExclaimEqual); | |||
8281 | Lookup(OO_Less); | |||
8282 | Lookup(OO_EqualEqual); | |||
8283 | } | |||
8284 | } | |||
8285 | ||||
8286 | bool Sema::CheckExplicitlyDefaultedComparison(Scope *S, FunctionDecl *FD, | |||
8287 | DefaultedComparisonKind DCK) { | |||
8288 | assert(DCK != DefaultedComparisonKind::None && "not a defaulted comparison")((DCK != DefaultedComparisonKind::None && "not a defaulted comparison" ) ? static_cast<void> (0) : __assert_fail ("DCK != DefaultedComparisonKind::None && \"not a defaulted comparison\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 8288, __PRETTY_FUNCTION__)); | |||
8289 | ||||
8290 | CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(FD->getLexicalDeclContext()); | |||
8291 | assert(RD && "defaulted comparison is not defaulted in a class")((RD && "defaulted comparison is not defaulted in a class" ) ? static_cast<void> (0) : __assert_fail ("RD && \"defaulted comparison is not defaulted in a class\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 8291, __PRETTY_FUNCTION__)); | |||
8292 | ||||
8293 | // Perform any unqualified lookups we're going to need to default this | |||
8294 | // function. | |||
8295 | if (S) { | |||
8296 | UnresolvedSet<32> Operators; | |||
8297 | lookupOperatorsForDefaultedComparison(*this, S, Operators, | |||
8298 | FD->getOverloadedOperator()); | |||
8299 | FD->setDefaultedFunctionInfo(FunctionDecl::DefaultedFunctionInfo::Create( | |||
8300 | Context, Operators.pairs())); | |||
8301 | } | |||
8302 | ||||
8303 | // C++2a [class.compare.default]p1: | |||
8304 | // A defaulted comparison operator function for some class C shall be a | |||
8305 | // non-template function declared in the member-specification of C that is | |||
8306 | // -- a non-static const member of C having one parameter of type | |||
8307 | // const C&, or | |||
8308 | // -- a friend of C having two parameters of type const C& or two | |||
8309 | // parameters of type C. | |||
8310 | QualType ExpectedParmType1 = Context.getRecordType(RD); | |||
8311 | QualType ExpectedParmType2 = | |||
8312 | Context.getLValueReferenceType(ExpectedParmType1.withConst()); | |||
8313 | if (isa<CXXMethodDecl>(FD)) | |||
8314 | ExpectedParmType1 = ExpectedParmType2; | |||
8315 | for (const ParmVarDecl *Param : FD->parameters()) { | |||
8316 | if (!Param->getType()->isDependentType() && | |||
8317 | !Context.hasSameType(Param->getType(), ExpectedParmType1) && | |||
8318 | !Context.hasSameType(Param->getType(), ExpectedParmType2)) { | |||
8319 | // Don't diagnose an implicit 'operator=='; we will have diagnosed the | |||
8320 | // corresponding defaulted 'operator<=>' already. | |||
8321 | if (!FD->isImplicit()) { | |||
8322 | Diag(FD->getLocation(), diag::err_defaulted_comparison_param) | |||
8323 | << (int)DCK << Param->getType() << ExpectedParmType1 | |||
8324 | << !isa<CXXMethodDecl>(FD) | |||
8325 | << ExpectedParmType2 << Param->getSourceRange(); | |||
8326 | } | |||
8327 | return true; | |||
8328 | } | |||
8329 | } | |||
8330 | if (FD->getNumParams() == 2 && | |||
8331 | !Context.hasSameType(FD->getParamDecl(0)->getType(), | |||
8332 | FD->getParamDecl(1)->getType())) { | |||
8333 | if (!FD->isImplicit()) { | |||
8334 | Diag(FD->getLocation(), diag::err_defaulted_comparison_param_mismatch) | |||
8335 | << (int)DCK | |||
8336 | << FD->getParamDecl(0)->getType() | |||
8337 | << FD->getParamDecl(0)->getSourceRange() | |||
8338 | << FD->getParamDecl(1)->getType() | |||
8339 | << FD->getParamDecl(1)->getSourceRange(); | |||
8340 | } | |||
8341 | return true; | |||
8342 | } | |||
8343 | ||||
8344 | // ... non-static const member ... | |||
8345 | if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) { | |||
8346 | assert(!MD->isStatic() && "comparison function cannot be a static member")((!MD->isStatic() && "comparison function cannot be a static member" ) ? static_cast<void> (0) : __assert_fail ("!MD->isStatic() && \"comparison function cannot be a static member\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 8346, __PRETTY_FUNCTION__)); | |||
8347 | if (!MD->isConst()) { | |||
8348 | SourceLocation InsertLoc; | |||
8349 | if (FunctionTypeLoc Loc = MD->getFunctionTypeLoc()) | |||
8350 | InsertLoc = getLocForEndOfToken(Loc.getRParenLoc()); | |||
8351 | // Don't diagnose an implicit 'operator=='; we will have diagnosed the | |||
8352 | // corresponding defaulted 'operator<=>' already. | |||
8353 | if (!MD->isImplicit()) { | |||
8354 | Diag(MD->getLocation(), diag::err_defaulted_comparison_non_const) | |||
8355 | << (int)DCK << FixItHint::CreateInsertion(InsertLoc, " const"); | |||
8356 | } | |||
8357 | ||||
8358 | // Add the 'const' to the type to recover. | |||
8359 | const auto *FPT = MD->getType()->castAs<FunctionProtoType>(); | |||
8360 | FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); | |||
8361 | EPI.TypeQuals.addConst(); | |||
8362 | MD->setType(Context.getFunctionType(FPT->getReturnType(), | |||
8363 | FPT->getParamTypes(), EPI)); | |||
8364 | } | |||
8365 | } else { | |||
8366 | // A non-member function declared in a class must be a friend. | |||
8367 | assert(FD->getFriendObjectKind() && "expected a friend declaration")((FD->getFriendObjectKind() && "expected a friend declaration" ) ? static_cast<void> (0) : __assert_fail ("FD->getFriendObjectKind() && \"expected a friend declaration\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 8367, __PRETTY_FUNCTION__)); | |||
8368 | } | |||
8369 | ||||
8370 | // C++2a [class.eq]p1, [class.rel]p1: | |||
8371 | // A [defaulted comparison other than <=>] shall have a declared return | |||
8372 | // type bool. | |||
8373 | if (DCK != DefaultedComparisonKind::ThreeWay && | |||
8374 | !FD->getDeclaredReturnType()->isDependentType() && | |||
8375 | !Context.hasSameType(FD->getDeclaredReturnType(), Context.BoolTy)) { | |||
8376 | Diag(FD->getLocation(), diag::err_defaulted_comparison_return_type_not_bool) | |||
8377 | << (int)DCK << FD->getDeclaredReturnType() << Context.BoolTy | |||
8378 | << FD->getReturnTypeSourceRange(); | |||
8379 | return true; | |||
8380 | } | |||
8381 | // C++2a [class.spaceship]p2 [P2002R0]: | |||
8382 | // Let R be the declared return type [...]. If R is auto, [...]. Otherwise, | |||
8383 | // R shall not contain a placeholder type. | |||
8384 | if (DCK == DefaultedComparisonKind::ThreeWay && | |||
8385 | FD->getDeclaredReturnType()->getContainedDeducedType() && | |||
8386 | !Context.hasSameType(FD->getDeclaredReturnType(), | |||
8387 | Context.getAutoDeductType())) { | |||
8388 | Diag(FD->getLocation(), | |||
8389 | diag::err_defaulted_comparison_deduced_return_type_not_auto) | |||
8390 | << (int)DCK << FD->getDeclaredReturnType() << Context.AutoDeductTy | |||
8391 | << FD->getReturnTypeSourceRange(); | |||
8392 | return true; | |||
8393 | } | |||
8394 | ||||
8395 | // For a defaulted function in a dependent class, defer all remaining checks | |||
8396 | // until instantiation. | |||
8397 | if (RD->isDependentType()) | |||
8398 | return false; | |||
8399 | ||||
8400 | // Determine whether the function should be defined as deleted. | |||
8401 | DefaultedComparisonInfo Info = | |||
8402 | DefaultedComparisonAnalyzer(*this, RD, FD, DCK).visit(); | |||
8403 | ||||
8404 | bool First = FD == FD->getCanonicalDecl(); | |||
8405 | ||||
8406 | // If we want to delete the function, then do so; there's nothing else to | |||
8407 | // check in that case. | |||
8408 | if (Info.Deleted) { | |||
8409 | if (!First) { | |||
8410 | // C++11 [dcl.fct.def.default]p4: | |||
8411 | // [For a] user-provided explicitly-defaulted function [...] if such a | |||
8412 | // function is implicitly defined as deleted, the program is ill-formed. | |||
8413 | // | |||
8414 | // This is really just a consequence of the general rule that you can | |||
8415 | // only delete a function on its first declaration. | |||
8416 | Diag(FD->getLocation(), diag::err_non_first_default_compare_deletes) | |||
8417 | << FD->isImplicit() << (int)DCK; | |||
8418 | DefaultedComparisonAnalyzer(*this, RD, FD, DCK, | |||
8419 | DefaultedComparisonAnalyzer::ExplainDeleted) | |||
8420 | .visit(); | |||
8421 | return true; | |||
8422 | } | |||
8423 | ||||
8424 | SetDeclDeleted(FD, FD->getLocation()); | |||
8425 | if (!inTemplateInstantiation() && !FD->isImplicit()) { | |||
8426 | Diag(FD->getLocation(), diag::warn_defaulted_comparison_deleted) | |||
8427 | << (int)DCK; | |||
8428 | DefaultedComparisonAnalyzer(*this, RD, FD, DCK, | |||
8429 | DefaultedComparisonAnalyzer::ExplainDeleted) | |||
8430 | .visit(); | |||
8431 | } | |||
8432 | return false; | |||
8433 | } | |||
8434 | ||||
8435 | // C++2a [class.spaceship]p2: | |||
8436 | // The return type is deduced as the common comparison type of R0, R1, ... | |||
8437 | if (DCK == DefaultedComparisonKind::ThreeWay && | |||
8438 | FD->getDeclaredReturnType()->isUndeducedAutoType()) { | |||
8439 | SourceLocation RetLoc = FD->getReturnTypeSourceRange().getBegin(); | |||
8440 | if (RetLoc.isInvalid()) | |||
8441 | RetLoc = FD->getBeginLoc(); | |||
8442 | // FIXME: Should we really care whether we have the complete type and the | |||
8443 | // 'enumerator' constants here? A forward declaration seems sufficient. | |||
8444 | QualType Cat = CheckComparisonCategoryType( | |||
8445 | Info.Category, RetLoc, ComparisonCategoryUsage::DefaultedOperator); | |||
8446 | if (Cat.isNull()) | |||
8447 | return true; | |||
8448 | Context.adjustDeducedFunctionResultType( | |||
8449 | FD, SubstAutoType(FD->getDeclaredReturnType(), Cat)); | |||
8450 | } | |||
8451 | ||||
8452 | // C++2a [dcl.fct.def.default]p3 [P2002R0]: | |||
8453 | // An explicitly-defaulted function that is not defined as deleted may be | |||
8454 | // declared constexpr or consteval only if it is constexpr-compatible. | |||
8455 | // C++2a [class.compare.default]p3 [P2002R0]: | |||
8456 | // A defaulted comparison function is constexpr-compatible if it satisfies | |||
8457 | // the requirements for a constexpr function [...] | |||
8458 | // The only relevant requirements are that the parameter and return types are | |||
8459 | // literal types. The remaining conditions are checked by the analyzer. | |||
8460 | if (FD->isConstexpr()) { | |||
8461 | if (CheckConstexprReturnType(*this, FD, CheckConstexprKind::Diagnose) && | |||
8462 | CheckConstexprParameterTypes(*this, FD, CheckConstexprKind::Diagnose) && | |||
8463 | !Info.Constexpr) { | |||
8464 | Diag(FD->getBeginLoc(), | |||
8465 | diag::err_incorrect_defaulted_comparison_constexpr) | |||
8466 | << FD->isImplicit() << (int)DCK << FD->isConsteval(); | |||
8467 | DefaultedComparisonAnalyzer(*this, RD, FD, DCK, | |||
8468 | DefaultedComparisonAnalyzer::ExplainConstexpr) | |||
8469 | .visit(); | |||
8470 | } | |||
8471 | } | |||
8472 | ||||
8473 | // C++2a [dcl.fct.def.default]p3 [P2002R0]: | |||
8474 | // If a constexpr-compatible function is explicitly defaulted on its first | |||
8475 | // declaration, it is implicitly considered to be constexpr. | |||
8476 | // FIXME: Only applying this to the first declaration seems problematic, as | |||
8477 | // simple reorderings can affect the meaning of the program. | |||
8478 | if (First && !FD->isConstexpr() && Info.Constexpr) | |||
8479 | FD->setConstexprKind(ConstexprSpecKind::Constexpr); | |||
8480 | ||||
8481 | // C++2a [except.spec]p3: | |||
8482 | // If a declaration of a function does not have a noexcept-specifier | |||
8483 | // [and] is defaulted on its first declaration, [...] the exception | |||
8484 | // specification is as specified below | |||
8485 | if (FD->getExceptionSpecType() == EST_None) { | |||
8486 | auto *FPT = FD->getType()->castAs<FunctionProtoType>(); | |||
8487 | FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); | |||
8488 | EPI.ExceptionSpec.Type = EST_Unevaluated; | |||
8489 | EPI.ExceptionSpec.SourceDecl = FD; | |||
8490 | FD->setType(Context.getFunctionType(FPT->getReturnType(), | |||
8491 | FPT->getParamTypes(), EPI)); | |||
8492 | } | |||
8493 | ||||
8494 | return false; | |||
8495 | } | |||
8496 | ||||
8497 | void Sema::DeclareImplicitEqualityComparison(CXXRecordDecl *RD, | |||
8498 | FunctionDecl *Spaceship) { | |||
8499 | Sema::CodeSynthesisContext Ctx; | |||
8500 | Ctx.Kind = Sema::CodeSynthesisContext::DeclaringImplicitEqualityComparison; | |||
8501 | Ctx.PointOfInstantiation = Spaceship->getEndLoc(); | |||
8502 | Ctx.Entity = Spaceship; | |||
8503 | pushCodeSynthesisContext(Ctx); | |||
8504 | ||||
8505 | if (FunctionDecl *EqualEqual = SubstSpaceshipAsEqualEqual(RD, Spaceship)) | |||
8506 | EqualEqual->setImplicit(); | |||
8507 | ||||
8508 | popCodeSynthesisContext(); | |||
8509 | } | |||
8510 | ||||
8511 | void Sema::DefineDefaultedComparison(SourceLocation UseLoc, FunctionDecl *FD, | |||
8512 | DefaultedComparisonKind DCK) { | |||
8513 | assert(FD->isDefaulted() && !FD->isDeleted() &&((FD->isDefaulted() && !FD->isDeleted() && !FD->doesThisDeclarationHaveABody()) ? static_cast<void > (0) : __assert_fail ("FD->isDefaulted() && !FD->isDeleted() && !FD->doesThisDeclarationHaveABody()" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 8514, __PRETTY_FUNCTION__)) | |||
8514 | !FD->doesThisDeclarationHaveABody())((FD->isDefaulted() && !FD->isDeleted() && !FD->doesThisDeclarationHaveABody()) ? static_cast<void > (0) : __assert_fail ("FD->isDefaulted() && !FD->isDeleted() && !FD->doesThisDeclarationHaveABody()" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 8514, __PRETTY_FUNCTION__)); | |||
8515 | if (FD->willHaveBody() || FD->isInvalidDecl()) | |||
8516 | return; | |||
8517 | ||||
8518 | SynthesizedFunctionScope Scope(*this, FD); | |||
8519 | ||||
8520 | // Add a context note for diagnostics produced after this point. | |||
8521 | Scope.addContextNote(UseLoc); | |||
8522 | ||||
8523 | { | |||
8524 | // Build and set up the function body. | |||
8525 | CXXRecordDecl *RD = cast<CXXRecordDecl>(FD->getLexicalParent()); | |||
8526 | SourceLocation BodyLoc = | |||
8527 | FD->getEndLoc().isValid() ? FD->getEndLoc() : FD->getLocation(); | |||
8528 | StmtResult Body = | |||
8529 | DefaultedComparisonSynthesizer(*this, RD, FD, DCK, BodyLoc).build(); | |||
8530 | if (Body.isInvalid()) { | |||
8531 | FD->setInvalidDecl(); | |||
8532 | return; | |||
8533 | } | |||
8534 | FD->setBody(Body.get()); | |||
8535 | FD->markUsed(Context); | |||
8536 | } | |||
8537 | ||||
8538 | // The exception specification is needed because we are defining the | |||
8539 | // function. Note that this will reuse the body we just built. | |||
8540 | ResolveExceptionSpec(UseLoc, FD->getType()->castAs<FunctionProtoType>()); | |||
8541 | ||||
8542 | if (ASTMutationListener *L = getASTMutationListener()) | |||
8543 | L->CompletedImplicitDefinition(FD); | |||
8544 | } | |||
8545 | ||||
8546 | static Sema::ImplicitExceptionSpecification | |||
8547 | ComputeDefaultedComparisonExceptionSpec(Sema &S, SourceLocation Loc, | |||
8548 | FunctionDecl *FD, | |||
8549 | Sema::DefaultedComparisonKind DCK) { | |||
8550 | ComputingExceptionSpec CES(S, FD, Loc); | |||
8551 | Sema::ImplicitExceptionSpecification ExceptSpec(S); | |||
8552 | ||||
8553 | if (FD->isInvalidDecl()) | |||
8554 | return ExceptSpec; | |||
8555 | ||||
8556 | // The common case is that we just defined the comparison function. In that | |||
8557 | // case, just look at whether the body can throw. | |||
8558 | if (FD->hasBody()) { | |||
8559 | ExceptSpec.CalledStmt(FD->getBody()); | |||
8560 | } else { | |||
8561 | // Otherwise, build a body so we can check it. This should ideally only | |||
8562 | // happen when we're not actually marking the function referenced. (This is | |||
8563 | // only really important for efficiency: we don't want to build and throw | |||
8564 | // away bodies for comparison functions more than we strictly need to.) | |||
8565 | ||||
8566 | // Pretend to synthesize the function body in an unevaluated context. | |||
8567 | // Note that we can't actually just go ahead and define the function here: | |||
8568 | // we are not permitted to mark its callees as referenced. | |||
8569 | Sema::SynthesizedFunctionScope Scope(S, FD); | |||
8570 | EnterExpressionEvaluationContext Context( | |||
8571 | S, Sema::ExpressionEvaluationContext::Unevaluated); | |||
8572 | ||||
8573 | CXXRecordDecl *RD = cast<CXXRecordDecl>(FD->getLexicalParent()); | |||
8574 | SourceLocation BodyLoc = | |||
8575 | FD->getEndLoc().isValid() ? FD->getEndLoc() : FD->getLocation(); | |||
8576 | StmtResult Body = | |||
8577 | DefaultedComparisonSynthesizer(S, RD, FD, DCK, BodyLoc).build(); | |||
8578 | if (!Body.isInvalid()) | |||
8579 | ExceptSpec.CalledStmt(Body.get()); | |||
8580 | ||||
8581 | // FIXME: Can we hold onto this body and just transform it to potentially | |||
8582 | // evaluated when we're asked to define the function rather than rebuilding | |||
8583 | // it? Either that, or we should only build the bits of the body that we | |||
8584 | // need (the expressions, not the statements). | |||
8585 | } | |||
8586 | ||||
8587 | return ExceptSpec; | |||
8588 | } | |||
8589 | ||||
8590 | void Sema::CheckDelayedMemberExceptionSpecs() { | |||
8591 | decltype(DelayedOverridingExceptionSpecChecks) Overriding; | |||
8592 | decltype(DelayedEquivalentExceptionSpecChecks) Equivalent; | |||
8593 | ||||
8594 | std::swap(Overriding, DelayedOverridingExceptionSpecChecks); | |||
8595 | std::swap(Equivalent, DelayedEquivalentExceptionSpecChecks); | |||
8596 | ||||
8597 | // Perform any deferred checking of exception specifications for virtual | |||
8598 | // destructors. | |||
8599 | for (auto &Check : Overriding) | |||
8600 | CheckOverridingFunctionExceptionSpec(Check.first, Check.second); | |||
8601 | ||||
8602 | // Perform any deferred checking of exception specifications for befriended | |||
8603 | // special members. | |||
8604 | for (auto &Check : Equivalent) | |||
8605 | CheckEquivalentExceptionSpec(Check.second, Check.first); | |||
8606 | } | |||
8607 | ||||
8608 | namespace { | |||
8609 | /// CRTP base class for visiting operations performed by a special member | |||
8610 | /// function (or inherited constructor). | |||
8611 | template<typename Derived> | |||
8612 | struct SpecialMemberVisitor { | |||
8613 | Sema &S; | |||
8614 | CXXMethodDecl *MD; | |||
8615 | Sema::CXXSpecialMember CSM; | |||
8616 | Sema::InheritedConstructorInfo *ICI; | |||
8617 | ||||
8618 | // Properties of the special member, computed for convenience. | |||
8619 | bool IsConstructor = false, IsAssignment = false, ConstArg = false; | |||
8620 | ||||
8621 | SpecialMemberVisitor(Sema &S, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM, | |||
8622 | Sema::InheritedConstructorInfo *ICI) | |||
8623 | : S(S), MD(MD), CSM(CSM), ICI(ICI) { | |||
8624 | switch (CSM) { | |||
8625 | case Sema::CXXDefaultConstructor: | |||
8626 | case Sema::CXXCopyConstructor: | |||
8627 | case Sema::CXXMoveConstructor: | |||
8628 | IsConstructor = true; | |||
8629 | break; | |||
8630 | case Sema::CXXCopyAssignment: | |||
8631 | case Sema::CXXMoveAssignment: | |||
8632 | IsAssignment = true; | |||
8633 | break; | |||
8634 | case Sema::CXXDestructor: | |||
8635 | break; | |||
8636 | case Sema::CXXInvalid: | |||
8637 | llvm_unreachable("invalid special member kind")::llvm::llvm_unreachable_internal("invalid special member kind" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 8637); | |||
8638 | } | |||
8639 | ||||
8640 | if (MD->getNumParams()) { | |||
8641 | if (const ReferenceType *RT = | |||
8642 | MD->getParamDecl(0)->getType()->getAs<ReferenceType>()) | |||
8643 | ConstArg = RT->getPointeeType().isConstQualified(); | |||
8644 | } | |||
8645 | } | |||
8646 | ||||
8647 | Derived &getDerived() { return static_cast<Derived&>(*this); } | |||
8648 | ||||
8649 | /// Is this a "move" special member? | |||
8650 | bool isMove() const { | |||
8651 | return CSM == Sema::CXXMoveConstructor || CSM == Sema::CXXMoveAssignment; | |||
8652 | } | |||
8653 | ||||
8654 | /// Look up the corresponding special member in the given class. | |||
8655 | Sema::SpecialMemberOverloadResult lookupIn(CXXRecordDecl *Class, | |||
8656 | unsigned Quals, bool IsMutable) { | |||
8657 | return lookupCallFromSpecialMember(S, Class, CSM, Quals, | |||
8658 | ConstArg && !IsMutable); | |||
8659 | } | |||
8660 | ||||
8661 | /// Look up the constructor for the specified base class to see if it's | |||
8662 | /// overridden due to this being an inherited constructor. | |||
8663 | Sema::SpecialMemberOverloadResult lookupInheritedCtor(CXXRecordDecl *Class) { | |||
8664 | if (!ICI) | |||
8665 | return {}; | |||
8666 | assert(CSM == Sema::CXXDefaultConstructor)((CSM == Sema::CXXDefaultConstructor) ? static_cast<void> (0) : __assert_fail ("CSM == Sema::CXXDefaultConstructor", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 8666, __PRETTY_FUNCTION__)); | |||
8667 | auto *BaseCtor = | |||
8668 | cast<CXXConstructorDecl>(MD)->getInheritedConstructor().getConstructor(); | |||
8669 | if (auto *MD = ICI->findConstructorForBase(Class, BaseCtor).first) | |||
8670 | return MD; | |||
8671 | return {}; | |||
8672 | } | |||
8673 | ||||
8674 | /// A base or member subobject. | |||
8675 | typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; | |||
8676 | ||||
8677 | /// Get the location to use for a subobject in diagnostics. | |||
8678 | static SourceLocation getSubobjectLoc(Subobject Subobj) { | |||
8679 | // FIXME: For an indirect virtual base, the direct base leading to | |||
8680 | // the indirect virtual base would be a more useful choice. | |||
8681 | if (auto *B = Subobj.dyn_cast<CXXBaseSpecifier*>()) | |||
8682 | return B->getBaseTypeLoc(); | |||
8683 | else | |||
8684 | return Subobj.get<FieldDecl*>()->getLocation(); | |||
8685 | } | |||
8686 | ||||
8687 | enum BasesToVisit { | |||
8688 | /// Visit all non-virtual (direct) bases. | |||
8689 | VisitNonVirtualBases, | |||
8690 | /// Visit all direct bases, virtual or not. | |||
8691 | VisitDirectBases, | |||
8692 | /// Visit all non-virtual bases, and all virtual bases if the class | |||
8693 | /// is not abstract. | |||
8694 | VisitPotentiallyConstructedBases, | |||
8695 | /// Visit all direct or virtual bases. | |||
8696 | VisitAllBases | |||
8697 | }; | |||
8698 | ||||
8699 | // Visit the bases and members of the class. | |||
8700 | bool visit(BasesToVisit Bases) { | |||
8701 | CXXRecordDecl *RD = MD->getParent(); | |||
8702 | ||||
8703 | if (Bases == VisitPotentiallyConstructedBases) | |||
8704 | Bases = RD->isAbstract() ? VisitNonVirtualBases : VisitAllBases; | |||
8705 | ||||
8706 | for (auto &B : RD->bases()) | |||
8707 | if ((Bases == VisitDirectBases || !B.isVirtual()) && | |||
8708 | getDerived().visitBase(&B)) | |||
8709 | return true; | |||
8710 | ||||
8711 | if (Bases == VisitAllBases) | |||
8712 | for (auto &B : RD->vbases()) | |||
8713 | if (getDerived().visitBase(&B)) | |||
8714 | return true; | |||
8715 | ||||
8716 | for (auto *F : RD->fields()) | |||
8717 | if (!F->isInvalidDecl() && !F->isUnnamedBitfield() && | |||
8718 | getDerived().visitField(F)) | |||
8719 | return true; | |||
8720 | ||||
8721 | return false; | |||
8722 | } | |||
8723 | }; | |||
8724 | } | |||
8725 | ||||
8726 | namespace { | |||
8727 | struct SpecialMemberDeletionInfo | |||
8728 | : SpecialMemberVisitor<SpecialMemberDeletionInfo> { | |||
8729 | bool Diagnose; | |||
8730 | ||||
8731 | SourceLocation Loc; | |||
8732 | ||||
8733 | bool AllFieldsAreConst; | |||
8734 | ||||
8735 | SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, | |||
8736 | Sema::CXXSpecialMember CSM, | |||
8737 | Sema::InheritedConstructorInfo *ICI, bool Diagnose) | |||
8738 | : SpecialMemberVisitor(S, MD, CSM, ICI), Diagnose(Diagnose), | |||
8739 | Loc(MD->getLocation()), AllFieldsAreConst(true) {} | |||
8740 | ||||
8741 | bool inUnion() const { return MD->getParent()->isUnion(); } | |||
8742 | ||||
8743 | Sema::CXXSpecialMember getEffectiveCSM() { | |||
8744 | return ICI ? Sema::CXXInvalid : CSM; | |||
8745 | } | |||
8746 | ||||
8747 | bool shouldDeleteForVariantObjCPtrMember(FieldDecl *FD, QualType FieldType); | |||
8748 | ||||
8749 | bool visitBase(CXXBaseSpecifier *Base) { return shouldDeleteForBase(Base); } | |||
8750 | bool visitField(FieldDecl *Field) { return shouldDeleteForField(Field); } | |||
8751 | ||||
8752 | bool shouldDeleteForBase(CXXBaseSpecifier *Base); | |||
8753 | bool shouldDeleteForField(FieldDecl *FD); | |||
8754 | bool shouldDeleteForAllConstMembers(); | |||
8755 | ||||
8756 | bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, | |||
8757 | unsigned Quals); | |||
8758 | bool shouldDeleteForSubobjectCall(Subobject Subobj, | |||
8759 | Sema::SpecialMemberOverloadResult SMOR, | |||
8760 | bool IsDtorCallInCtor); | |||
8761 | ||||
8762 | bool isAccessible(Subobject Subobj, CXXMethodDecl *D); | |||
8763 | }; | |||
8764 | } | |||
8765 | ||||
8766 | /// Is the given special member inaccessible when used on the given | |||
8767 | /// sub-object. | |||
8768 | bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, | |||
8769 | CXXMethodDecl *target) { | |||
8770 | /// If we're operating on a base class, the object type is the | |||
8771 | /// type of this special member. | |||
8772 | QualType objectTy; | |||
8773 | AccessSpecifier access = target->getAccess(); | |||
8774 | if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { | |||
8775 | objectTy = S.Context.getTypeDeclType(MD->getParent()); | |||
8776 | access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); | |||
8777 | ||||
8778 | // If we're operating on a field, the object type is the type of the field. | |||
8779 | } else { | |||
8780 | objectTy = S.Context.getTypeDeclType(target->getParent()); | |||
8781 | } | |||
8782 | ||||
8783 | return S.isMemberAccessibleForDeletion( | |||
8784 | target->getParent(), DeclAccessPair::make(target, access), objectTy); | |||
8785 | } | |||
8786 | ||||
8787 | /// Check whether we should delete a special member due to the implicit | |||
8788 | /// definition containing a call to a special member of a subobject. | |||
8789 | bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( | |||
8790 | Subobject Subobj, Sema::SpecialMemberOverloadResult SMOR, | |||
8791 | bool IsDtorCallInCtor) { | |||
8792 | CXXMethodDecl *Decl = SMOR.getMethod(); | |||
8793 | FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); | |||
8794 | ||||
8795 | int DiagKind = -1; | |||
8796 | ||||
8797 | if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) | |||
8798 | DiagKind = !Decl ? 0 : 1; | |||
8799 | else if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) | |||
8800 | DiagKind = 2; | |||
8801 | else if (!isAccessible(Subobj, Decl)) | |||
8802 | DiagKind = 3; | |||
8803 | else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && | |||
8804 | !Decl->isTrivial()) { | |||
8805 | // A member of a union must have a trivial corresponding special member. | |||
8806 | // As a weird special case, a destructor call from a union's constructor | |||
8807 | // must be accessible and non-deleted, but need not be trivial. Such a | |||
8808 | // destructor is never actually called, but is semantically checked as | |||
8809 | // if it were. | |||
8810 | DiagKind = 4; | |||
8811 | } | |||
8812 | ||||
8813 | if (DiagKind == -1) | |||
8814 | return false; | |||
8815 | ||||
8816 | if (Diagnose) { | |||
8817 | if (Field) { | |||
8818 | S.Diag(Field->getLocation(), | |||
8819 | diag::note_deleted_special_member_class_subobject) | |||
8820 | << getEffectiveCSM() << MD->getParent() << /*IsField*/true | |||
8821 | << Field << DiagKind << IsDtorCallInCtor << /*IsObjCPtr*/false; | |||
8822 | } else { | |||
8823 | CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); | |||
8824 | S.Diag(Base->getBeginLoc(), | |||
8825 | diag::note_deleted_special_member_class_subobject) | |||
8826 | << getEffectiveCSM() << MD->getParent() << /*IsField*/ false | |||
8827 | << Base->getType() << DiagKind << IsDtorCallInCtor | |||
8828 | << /*IsObjCPtr*/false; | |||
8829 | } | |||
8830 | ||||
8831 | if (DiagKind == 1) | |||
8832 | S.NoteDeletedFunction(Decl); | |||
8833 | // FIXME: Explain inaccessibility if DiagKind == 3. | |||
8834 | } | |||
8835 | ||||
8836 | return true; | |||
8837 | } | |||
8838 | ||||
8839 | /// Check whether we should delete a special member function due to having a | |||
8840 | /// direct or virtual base class or non-static data member of class type M. | |||
8841 | bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( | |||
8842 | CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { | |||
8843 | FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); | |||
8844 | bool IsMutable = Field && Field->isMutable(); | |||
8845 | ||||
8846 | // C++11 [class.ctor]p5: | |||
8847 | // -- any direct or virtual base class, or non-static data member with no | |||
8848 | // brace-or-equal-initializer, has class type M (or array thereof) and | |||
8849 | // either M has no default constructor or overload resolution as applied | |||
8850 | // to M's default constructor results in an ambiguity or in a function | |||
8851 | // that is deleted or inaccessible | |||
8852 | // C++11 [class.copy]p11, C++11 [class.copy]p23: | |||
8853 | // -- a direct or virtual base class B that cannot be copied/moved because | |||
8854 | // overload resolution, as applied to B's corresponding special member, | |||
8855 | // results in an ambiguity or a function that is deleted or inaccessible | |||
8856 | // from the defaulted special member | |||
8857 | // C++11 [class.dtor]p5: | |||
8858 | // -- any direct or virtual base class [...] has a type with a destructor | |||
8859 | // that is deleted or inaccessible | |||
8860 | if (!(CSM == Sema::CXXDefaultConstructor && | |||
8861 | Field && Field->hasInClassInitializer()) && | |||
8862 | shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals, IsMutable), | |||
8863 | false)) | |||
8864 | return true; | |||
8865 | ||||
8866 | // C++11 [class.ctor]p5, C++11 [class.copy]p11: | |||
8867 | // -- any direct or virtual base class or non-static data member has a | |||
8868 | // type with a destructor that is deleted or inaccessible | |||
8869 | if (IsConstructor) { | |||
8870 | Sema::SpecialMemberOverloadResult SMOR = | |||
8871 | S.LookupSpecialMember(Class, Sema::CXXDestructor, | |||
8872 | false, false, false, false, false); | |||
8873 | if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) | |||
8874 | return true; | |||
8875 | } | |||
8876 | ||||
8877 | return false; | |||
8878 | } | |||
8879 | ||||
8880 | bool SpecialMemberDeletionInfo::shouldDeleteForVariantObjCPtrMember( | |||
8881 | FieldDecl *FD, QualType FieldType) { | |||
8882 | // The defaulted special functions are defined as deleted if this is a variant | |||
8883 | // member with a non-trivial ownership type, e.g., ObjC __strong or __weak | |||
8884 | // type under ARC. | |||
8885 | if (!FieldType.hasNonTrivialObjCLifetime()) | |||
8886 | return false; | |||
8887 | ||||
8888 | // Don't make the defaulted default constructor defined as deleted if the | |||
8889 | // member has an in-class initializer. | |||
8890 | if (CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer()) | |||
8891 | return false; | |||
8892 | ||||
8893 | if (Diagnose) { | |||
8894 | auto *ParentClass = cast<CXXRecordDecl>(FD->getParent()); | |||
8895 | S.Diag(FD->getLocation(), | |||
8896 | diag::note_deleted_special_member_class_subobject) | |||
8897 | << getEffectiveCSM() << ParentClass << /*IsField*/true | |||
8898 | << FD << 4 << /*IsDtorCallInCtor*/false << /*IsObjCPtr*/true; | |||
8899 | } | |||
8900 | ||||
8901 | return true; | |||
8902 | } | |||
8903 | ||||
8904 | /// Check whether we should delete a special member function due to the class | |||
8905 | /// having a particular direct or virtual base class. | |||
8906 | bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { | |||
8907 | CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); | |||
8908 | // If program is correct, BaseClass cannot be null, but if it is, the error | |||
8909 | // must be reported elsewhere. | |||
8910 | if (!BaseClass) | |||
8911 | return false; | |||
8912 | // If we have an inheriting constructor, check whether we're calling an | |||
8913 | // inherited constructor instead of a default constructor. | |||
8914 | Sema::SpecialMemberOverloadResult SMOR = lookupInheritedCtor(BaseClass); | |||
8915 | if (auto *BaseCtor = SMOR.getMethod()) { | |||
8916 | // Note that we do not check access along this path; other than that, | |||
8917 | // this is the same as shouldDeleteForSubobjectCall(Base, BaseCtor, false); | |||
8918 | // FIXME: Check that the base has a usable destructor! Sink this into | |||
8919 | // shouldDeleteForClassSubobject. | |||
8920 | if (BaseCtor->isDeleted() && Diagnose) { | |||
8921 | S.Diag(Base->getBeginLoc(), | |||
8922 | diag::note_deleted_special_member_class_subobject) | |||
8923 | << getEffectiveCSM() << MD->getParent() << /*IsField*/ false | |||
8924 | << Base->getType() << /*Deleted*/ 1 << /*IsDtorCallInCtor*/ false | |||
8925 | << /*IsObjCPtr*/false; | |||
8926 | S.NoteDeletedFunction(BaseCtor); | |||
8927 | } | |||
8928 | return BaseCtor->isDeleted(); | |||
8929 | } | |||
8930 | return shouldDeleteForClassSubobject(BaseClass, Base, 0); | |||
8931 | } | |||
8932 | ||||
8933 | /// Check whether we should delete a special member function due to the class | |||
8934 | /// having a particular non-static data member. | |||
8935 | bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { | |||
8936 | QualType FieldType = S.Context.getBaseElementType(FD->getType()); | |||
8937 | CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); | |||
8938 | ||||
8939 | if (inUnion() && shouldDeleteForVariantObjCPtrMember(FD, FieldType)) | |||
8940 | return true; | |||
8941 | ||||
8942 | if (CSM == Sema::CXXDefaultConstructor) { | |||
8943 | // For a default constructor, all references must be initialized in-class | |||
8944 | // and, if a union, it must have a non-const member. | |||
8945 | if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { | |||
8946 | if (Diagnose) | |||
8947 | S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) | |||
8948 | << !!ICI << MD->getParent() << FD << FieldType << /*Reference*/0; | |||
8949 | return true; | |||
8950 | } | |||
8951 | // C++11 [class.ctor]p5: any non-variant non-static data member of | |||
8952 | // const-qualified type (or array thereof) with no | |||
8953 | // brace-or-equal-initializer does not have a user-provided default | |||
8954 | // constructor. | |||
8955 | if (!inUnion() && FieldType.isConstQualified() && | |||
8956 | !FD->hasInClassInitializer() && | |||
8957 | (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { | |||
8958 | if (Diagnose) | |||
8959 | S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) | |||
8960 | << !!ICI << MD->getParent() << FD << FD->getType() << /*Const*/1; | |||
8961 | return true; | |||
8962 | } | |||
8963 | ||||
8964 | if (inUnion() && !FieldType.isConstQualified()) | |||
8965 | AllFieldsAreConst = false; | |||
8966 | } else if (CSM == Sema::CXXCopyConstructor) { | |||
8967 | // For a copy constructor, data members must not be of rvalue reference | |||
8968 | // type. | |||
8969 | if (FieldType->isRValueReferenceType()) { | |||
8970 | if (Diagnose) | |||
8971 | S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) | |||
8972 | << MD->getParent() << FD << FieldType; | |||
8973 | return true; | |||
8974 | } | |||
8975 | } else if (IsAssignment) { | |||
8976 | // For an assignment operator, data members must not be of reference type. | |||
8977 | if (FieldType->isReferenceType()) { | |||
8978 | if (Diagnose) | |||
8979 | S.Diag(FD->getLocation(), diag::note_deleted_assign_field) | |||
8980 | << isMove() << MD->getParent() << FD << FieldType << /*Reference*/0; | |||
8981 | return true; | |||
8982 | } | |||
8983 | if (!FieldRecord && FieldType.isConstQualified()) { | |||
8984 | // C++11 [class.copy]p23: | |||
8985 | // -- a non-static data member of const non-class type (or array thereof) | |||
8986 | if (Diagnose) | |||
8987 | S.Diag(FD->getLocation(), diag::note_deleted_assign_field) | |||
8988 | << isMove() << MD->getParent() << FD << FD->getType() << /*Const*/1; | |||
8989 | return true; | |||
8990 | } | |||
8991 | } | |||
8992 | ||||
8993 | if (FieldRecord) { | |||
8994 | // Some additional restrictions exist on the variant members. | |||
8995 | if (!inUnion() && FieldRecord->isUnion() && | |||
8996 | FieldRecord->isAnonymousStructOrUnion()) { | |||
8997 | bool AllVariantFieldsAreConst = true; | |||
8998 | ||||
8999 | // FIXME: Handle anonymous unions declared within anonymous unions. | |||
9000 | for (auto *UI : FieldRecord->fields()) { | |||
9001 | QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); | |||
9002 | ||||
9003 | if (shouldDeleteForVariantObjCPtrMember(&*UI, UnionFieldType)) | |||
9004 | return true; | |||
9005 | ||||
9006 | if (!UnionFieldType.isConstQualified()) | |||
9007 | AllVariantFieldsAreConst = false; | |||
9008 | ||||
9009 | CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); | |||
9010 | if (UnionFieldRecord && | |||
9011 | shouldDeleteForClassSubobject(UnionFieldRecord, UI, | |||
9012 | UnionFieldType.getCVRQualifiers())) | |||
9013 | return true; | |||
9014 | } | |||
9015 | ||||
9016 | // At least one member in each anonymous union must be non-const | |||
9017 | if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && | |||
9018 | !FieldRecord->field_empty()) { | |||
9019 | if (Diagnose) | |||
9020 | S.Diag(FieldRecord->getLocation(), | |||
9021 | diag::note_deleted_default_ctor_all_const) | |||
9022 | << !!ICI << MD->getParent() << /*anonymous union*/1; | |||
9023 | return true; | |||
9024 | } | |||
9025 | ||||
9026 | // Don't check the implicit member of the anonymous union type. | |||
9027 | // This is technically non-conformant, but sanity demands it. | |||
9028 | return false; | |||
9029 | } | |||
9030 | ||||
9031 | if (shouldDeleteForClassSubobject(FieldRecord, FD, | |||
9032 | FieldType.getCVRQualifiers())) | |||
9033 | return true; | |||
9034 | } | |||
9035 | ||||
9036 | return false; | |||
9037 | } | |||
9038 | ||||
9039 | /// C++11 [class.ctor] p5: | |||
9040 | /// A defaulted default constructor for a class X is defined as deleted if | |||
9041 | /// X is a union and all of its variant members are of const-qualified type. | |||
9042 | bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { | |||
9043 | // This is a silly definition, because it gives an empty union a deleted | |||
9044 | // default constructor. Don't do that. | |||
9045 | if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst) { | |||
9046 | bool AnyFields = false; | |||
9047 | for (auto *F : MD->getParent()->fields()) | |||
9048 | if ((AnyFields = !F->isUnnamedBitfield())) | |||
9049 | break; | |||
9050 | if (!AnyFields) | |||
9051 | return false; | |||
9052 | if (Diagnose) | |||
9053 | S.Diag(MD->getParent()->getLocation(), | |||
9054 | diag::note_deleted_default_ctor_all_const) | |||
9055 | << !!ICI << MD->getParent() << /*not anonymous union*/0; | |||
9056 | return true; | |||
9057 | } | |||
9058 | return false; | |||
9059 | } | |||
9060 | ||||
9061 | /// Determine whether a defaulted special member function should be defined as | |||
9062 | /// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, | |||
9063 | /// C++11 [class.copy]p23, and C++11 [class.dtor]p5. | |||
9064 | bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, | |||
9065 | InheritedConstructorInfo *ICI, | |||
9066 | bool Diagnose) { | |||
9067 | if (MD->isInvalidDecl()) | |||
9068 | return false; | |||
9069 | CXXRecordDecl *RD = MD->getParent(); | |||
9070 | assert(!RD->isDependentType() && "do deletion after instantiation")((!RD->isDependentType() && "do deletion after instantiation" ) ? static_cast<void> (0) : __assert_fail ("!RD->isDependentType() && \"do deletion after instantiation\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 9070, __PRETTY_FUNCTION__)); | |||
9071 | if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl()) | |||
9072 | return false; | |||
9073 | ||||
9074 | // C++11 [expr.lambda.prim]p19: | |||
9075 | // The closure type associated with a lambda-expression has a | |||
9076 | // deleted (8.4.3) default constructor and a deleted copy | |||
9077 | // assignment operator. | |||
9078 | // C++2a adds back these operators if the lambda has no lambda-capture. | |||
9079 | if (RD->isLambda() && !RD->lambdaIsDefaultConstructibleAndAssignable() && | |||
9080 | (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { | |||
9081 | if (Diagnose) | |||
9082 | Diag(RD->getLocation(), diag::note_lambda_decl); | |||
9083 | return true; | |||
9084 | } | |||
9085 | ||||
9086 | // For an anonymous struct or union, the copy and assignment special members | |||
9087 | // will never be used, so skip the check. For an anonymous union declared at | |||
9088 | // namespace scope, the constructor and destructor are used. | |||
9089 | if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && | |||
9090 | RD->isAnonymousStructOrUnion()) | |||
9091 | return false; | |||
9092 | ||||
9093 | // C++11 [class.copy]p7, p18: | |||
9094 | // If the class definition declares a move constructor or move assignment | |||
9095 | // operator, an implicitly declared copy constructor or copy assignment | |||
9096 | // operator is defined as deleted. | |||
9097 | if (MD->isImplicit() && | |||
9098 | (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { | |||
9099 | CXXMethodDecl *UserDeclaredMove = nullptr; | |||
9100 | ||||
9101 | // In Microsoft mode up to MSVC 2013, a user-declared move only causes the | |||
9102 | // deletion of the corresponding copy operation, not both copy operations. | |||
9103 | // MSVC 2015 has adopted the standards conforming behavior. | |||
9104 | bool DeletesOnlyMatchingCopy = | |||
9105 | getLangOpts().MSVCCompat && | |||
9106 | !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015); | |||
9107 | ||||
9108 | if (RD->hasUserDeclaredMoveConstructor() && | |||
9109 | (!DeletesOnlyMatchingCopy || CSM == CXXCopyConstructor)) { | |||
9110 | if (!Diagnose) return true; | |||
9111 | ||||
9112 | // Find any user-declared move constructor. | |||
9113 | for (auto *I : RD->ctors()) { | |||
9114 | if (I->isMoveConstructor()) { | |||
9115 | UserDeclaredMove = I; | |||
9116 | break; | |||
9117 | } | |||
9118 | } | |||
9119 | assert(UserDeclaredMove)((UserDeclaredMove) ? static_cast<void> (0) : __assert_fail ("UserDeclaredMove", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 9119, __PRETTY_FUNCTION__)); | |||
9120 | } else if (RD->hasUserDeclaredMoveAssignment() && | |||
9121 | (!DeletesOnlyMatchingCopy || CSM == CXXCopyAssignment)) { | |||
9122 | if (!Diagnose) return true; | |||
9123 | ||||
9124 | // Find any user-declared move assignment operator. | |||
9125 | for (auto *I : RD->methods()) { | |||
9126 | if (I->isMoveAssignmentOperator()) { | |||
9127 | UserDeclaredMove = I; | |||
9128 | break; | |||
9129 | } | |||
9130 | } | |||
9131 | assert(UserDeclaredMove)((UserDeclaredMove) ? static_cast<void> (0) : __assert_fail ("UserDeclaredMove", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 9131, __PRETTY_FUNCTION__)); | |||
9132 | } | |||
9133 | ||||
9134 | if (UserDeclaredMove) { | |||
9135 | Diag(UserDeclaredMove->getLocation(), | |||
9136 | diag::note_deleted_copy_user_declared_move) | |||
9137 | << (CSM == CXXCopyAssignment) << RD | |||
9138 | << UserDeclaredMove->isMoveAssignmentOperator(); | |||
9139 | return true; | |||
9140 | } | |||
9141 | } | |||
9142 | ||||
9143 | // Do access control from the special member function | |||
9144 | ContextRAII MethodContext(*this, MD); | |||
9145 | ||||
9146 | // C++11 [class.dtor]p5: | |||
9147 | // -- for a virtual destructor, lookup of the non-array deallocation function | |||
9148 | // results in an ambiguity or in a function that is deleted or inaccessible | |||
9149 | if (CSM == CXXDestructor && MD->isVirtual()) { | |||
9150 | FunctionDecl *OperatorDelete = nullptr; | |||
9151 | DeclarationName Name = | |||
9152 | Context.DeclarationNames.getCXXOperatorName(OO_Delete); | |||
9153 | if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, | |||
9154 | OperatorDelete, /*Diagnose*/false)) { | |||
9155 | if (Diagnose) | |||
9156 | Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); | |||
9157 | return true; | |||
9158 | } | |||
9159 | } | |||
9160 | ||||
9161 | SpecialMemberDeletionInfo SMI(*this, MD, CSM, ICI, Diagnose); | |||
9162 | ||||
9163 | // Per DR1611, do not consider virtual bases of constructors of abstract | |||
9164 | // classes, since we are not going to construct them. | |||
9165 | // Per DR1658, do not consider virtual bases of destructors of abstract | |||
9166 | // classes either. | |||
9167 | // Per DR2180, for assignment operators we only assign (and thus only | |||
9168 | // consider) direct bases. | |||
9169 | if (SMI.visit(SMI.IsAssignment ? SMI.VisitDirectBases | |||
9170 | : SMI.VisitPotentiallyConstructedBases)) | |||
9171 | return true; | |||
9172 | ||||
9173 | if (SMI.shouldDeleteForAllConstMembers()) | |||
9174 | return true; | |||
9175 | ||||
9176 | if (getLangOpts().CUDA) { | |||
9177 | // We should delete the special member in CUDA mode if target inference | |||
9178 | // failed. | |||
9179 | // For inherited constructors (non-null ICI), CSM may be passed so that MD | |||
9180 | // is treated as certain special member, which may not reflect what special | |||
9181 | // member MD really is. However inferCUDATargetForImplicitSpecialMember | |||
9182 | // expects CSM to match MD, therefore recalculate CSM. | |||
9183 | assert(ICI || CSM == getSpecialMember(MD))((ICI || CSM == getSpecialMember(MD)) ? static_cast<void> (0) : __assert_fail ("ICI || CSM == getSpecialMember(MD)", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 9183, __PRETTY_FUNCTION__)); | |||
9184 | auto RealCSM = CSM; | |||
9185 | if (ICI) | |||
9186 | RealCSM = getSpecialMember(MD); | |||
9187 | ||||
9188 | return inferCUDATargetForImplicitSpecialMember(RD, RealCSM, MD, | |||
9189 | SMI.ConstArg, Diagnose); | |||
9190 | } | |||
9191 | ||||
9192 | return false; | |||
9193 | } | |||
9194 | ||||
9195 | void Sema::DiagnoseDeletedDefaultedFunction(FunctionDecl *FD) { | |||
9196 | DefaultedFunctionKind DFK = getDefaultedFunctionKind(FD); | |||
9197 | assert(DFK && "not a defaultable function")((DFK && "not a defaultable function") ? static_cast< void> (0) : __assert_fail ("DFK && \"not a defaultable function\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 9197, __PRETTY_FUNCTION__)); | |||
9198 | assert(FD->isDefaulted() && FD->isDeleted() && "not defaulted and deleted")((FD->isDefaulted() && FD->isDeleted() && "not defaulted and deleted") ? static_cast<void> (0) : __assert_fail ("FD->isDefaulted() && FD->isDeleted() && \"not defaulted and deleted\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 9198, __PRETTY_FUNCTION__)); | |||
9199 | ||||
9200 | if (DFK.isSpecialMember()) { | |||
9201 | ShouldDeleteSpecialMember(cast<CXXMethodDecl>(FD), DFK.asSpecialMember(), | |||
9202 | nullptr, /*Diagnose=*/true); | |||
9203 | } else { | |||
9204 | DefaultedComparisonAnalyzer( | |||
9205 | *this, cast<CXXRecordDecl>(FD->getLexicalDeclContext()), FD, | |||
9206 | DFK.asComparison(), DefaultedComparisonAnalyzer::ExplainDeleted) | |||
9207 | .visit(); | |||
9208 | } | |||
9209 | } | |||
9210 | ||||
9211 | /// Perform lookup for a special member of the specified kind, and determine | |||
9212 | /// whether it is trivial. If the triviality can be determined without the | |||
9213 | /// lookup, skip it. This is intended for use when determining whether a | |||
9214 | /// special member of a containing object is trivial, and thus does not ever | |||
9215 | /// perform overload resolution for default constructors. | |||
9216 | /// | |||
9217 | /// If \p Selected is not \c NULL, \c *Selected will be filled in with the | |||
9218 | /// member that was most likely to be intended to be trivial, if any. | |||
9219 | /// | |||
9220 | /// If \p ForCall is true, look at CXXRecord::HasTrivialSpecialMembersForCall to | |||
9221 | /// determine whether the special member is trivial. | |||
9222 | static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD, | |||
9223 | Sema::CXXSpecialMember CSM, unsigned Quals, | |||
9224 | bool ConstRHS, | |||
9225 | Sema::TrivialABIHandling TAH, | |||
9226 | CXXMethodDecl **Selected) { | |||
9227 | if (Selected) | |||
9228 | *Selected = nullptr; | |||
9229 | ||||
9230 | switch (CSM) { | |||
9231 | case Sema::CXXInvalid: | |||
9232 | llvm_unreachable("not a special member")::llvm::llvm_unreachable_internal("not a special member", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 9232); | |||
9233 | ||||
9234 | case Sema::CXXDefaultConstructor: | |||
9235 | // C++11 [class.ctor]p5: | |||
9236 | // A default constructor is trivial if: | |||
9237 | // - all the [direct subobjects] have trivial default constructors | |||
9238 | // | |||
9239 | // Note, no overload resolution is performed in this case. | |||
9240 | if (RD->hasTrivialDefaultConstructor()) | |||
9241 | return true; | |||
9242 | ||||
9243 | if (Selected) { | |||
9244 | // If there's a default constructor which could have been trivial, dig it | |||
9245 | // out. Otherwise, if there's any user-provided default constructor, point | |||
9246 | // to that as an example of why there's not a trivial one. | |||
9247 | CXXConstructorDecl *DefCtor = nullptr; | |||
9248 | if (RD->needsImplicitDefaultConstructor()) | |||
9249 | S.DeclareImplicitDefaultConstructor(RD); | |||
9250 | for (auto *CI : RD->ctors()) { | |||
9251 | if (!CI->isDefaultConstructor()) | |||
9252 | continue; | |||
9253 | DefCtor = CI; | |||
9254 | if (!DefCtor->isUserProvided()) | |||
9255 | break; | |||
9256 | } | |||
9257 | ||||
9258 | *Selected = DefCtor; | |||
9259 | } | |||
9260 | ||||
9261 | return false; | |||
9262 | ||||
9263 | case Sema::CXXDestructor: | |||
9264 | // C++11 [class.dtor]p5: | |||
9265 | // A destructor is trivial if: | |||
9266 | // - all the direct [subobjects] have trivial destructors | |||
9267 | if (RD->hasTrivialDestructor() || | |||
9268 | (TAH == Sema::TAH_ConsiderTrivialABI && | |||
9269 | RD->hasTrivialDestructorForCall())) | |||
9270 | return true; | |||
9271 | ||||
9272 | if (Selected) { | |||
9273 | if (RD->needsImplicitDestructor()) | |||
9274 | S.DeclareImplicitDestructor(RD); | |||
9275 | *Selected = RD->getDestructor(); | |||
9276 | } | |||
9277 | ||||
9278 | return false; | |||
9279 | ||||
9280 | case Sema::CXXCopyConstructor: | |||
9281 | // C++11 [class.copy]p12: | |||
9282 | // A copy constructor is trivial if: | |||
9283 | // - the constructor selected to copy each direct [subobject] is trivial | |||
9284 | if (RD->hasTrivialCopyConstructor() || | |||
9285 | (TAH == Sema::TAH_ConsiderTrivialABI && | |||
9286 | RD->hasTrivialCopyConstructorForCall())) { | |||
9287 | if (Quals == Qualifiers::Const) | |||
9288 | // We must either select the trivial copy constructor or reach an | |||
9289 | // ambiguity; no need to actually perform overload resolution. | |||
9290 | return true; | |||
9291 | } else if (!Selected) { | |||
9292 | return false; | |||
9293 | } | |||
9294 | // In C++98, we are not supposed to perform overload resolution here, but we | |||
9295 | // treat that as a language defect, as suggested on cxx-abi-dev, to treat | |||
9296 | // cases like B as having a non-trivial copy constructor: | |||
9297 | // struct A { template<typename T> A(T&); }; | |||
9298 | // struct B { mutable A a; }; | |||
9299 | goto NeedOverloadResolution; | |||
9300 | ||||
9301 | case Sema::CXXCopyAssignment: | |||
9302 | // C++11 [class.copy]p25: | |||
9303 | // A copy assignment operator is trivial if: | |||
9304 | // - the assignment operator selected to copy each direct [subobject] is | |||
9305 | // trivial | |||
9306 | if (RD->hasTrivialCopyAssignment()) { | |||
9307 | if (Quals == Qualifiers::Const) | |||
9308 | return true; | |||
9309 | } else if (!Selected) { | |||
9310 | return false; | |||
9311 | } | |||
9312 | // In C++98, we are not supposed to perform overload resolution here, but we | |||
9313 | // treat that as a language defect. | |||
9314 | goto NeedOverloadResolution; | |||
9315 | ||||
9316 | case Sema::CXXMoveConstructor: | |||
9317 | case Sema::CXXMoveAssignment: | |||
9318 | NeedOverloadResolution: | |||
9319 | Sema::SpecialMemberOverloadResult SMOR = | |||
9320 | lookupCallFromSpecialMember(S, RD, CSM, Quals, ConstRHS); | |||
9321 | ||||
9322 | // The standard doesn't describe how to behave if the lookup is ambiguous. | |||
9323 | // We treat it as not making the member non-trivial, just like the standard | |||
9324 | // mandates for the default constructor. This should rarely matter, because | |||
9325 | // the member will also be deleted. | |||
9326 | if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) | |||
9327 | return true; | |||
9328 | ||||
9329 | if (!SMOR.getMethod()) { | |||
9330 | assert(SMOR.getKind() ==((SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted ) ? static_cast<void> (0) : __assert_fail ("SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 9331, __PRETTY_FUNCTION__)) | |||
9331 | Sema::SpecialMemberOverloadResult::NoMemberOrDeleted)((SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted ) ? static_cast<void> (0) : __assert_fail ("SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 9331, __PRETTY_FUNCTION__)); | |||
9332 | return false; | |||
9333 | } | |||
9334 | ||||
9335 | // We deliberately don't check if we found a deleted special member. We're | |||
9336 | // not supposed to! | |||
9337 | if (Selected) | |||
9338 | *Selected = SMOR.getMethod(); | |||
9339 | ||||
9340 | if (TAH == Sema::TAH_ConsiderTrivialABI && | |||
9341 | (CSM == Sema::CXXCopyConstructor || CSM == Sema::CXXMoveConstructor)) | |||
9342 | return SMOR.getMethod()->isTrivialForCall(); | |||
9343 | return SMOR.getMethod()->isTrivial(); | |||
9344 | } | |||
9345 | ||||
9346 | llvm_unreachable("unknown special method kind")::llvm::llvm_unreachable_internal("unknown special method kind" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 9346); | |||
9347 | } | |||
9348 | ||||
9349 | static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) { | |||
9350 | for (auto *CI : RD->ctors()) | |||
9351 | if (!CI->isImplicit()) | |||
9352 | return CI; | |||
9353 | ||||
9354 | // Look for constructor templates. | |||
9355 | typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter; | |||
9356 | for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) { | |||
9357 | if (CXXConstructorDecl *CD = | |||
9358 | dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl())) | |||
9359 | return CD; | |||
9360 | } | |||
9361 | ||||
9362 | return nullptr; | |||
9363 | } | |||
9364 | ||||
9365 | /// The kind of subobject we are checking for triviality. The values of this | |||
9366 | /// enumeration are used in diagnostics. | |||
9367 | enum TrivialSubobjectKind { | |||
9368 | /// The subobject is a base class. | |||
9369 | TSK_BaseClass, | |||
9370 | /// The subobject is a non-static data member. | |||
9371 | TSK_Field, | |||
9372 | /// The object is actually the complete object. | |||
9373 | TSK_CompleteObject | |||
9374 | }; | |||
9375 | ||||
9376 | /// Check whether the special member selected for a given type would be trivial. | |||
9377 | static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc, | |||
9378 | QualType SubType, bool ConstRHS, | |||
9379 | Sema::CXXSpecialMember CSM, | |||
9380 | TrivialSubobjectKind Kind, | |||
9381 | Sema::TrivialABIHandling TAH, bool Diagnose) { | |||
9382 | CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl(); | |||
9383 | if (!SubRD) | |||
9384 | return true; | |||
9385 | ||||
9386 | CXXMethodDecl *Selected; | |||
9387 | if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(), | |||
9388 | ConstRHS, TAH, Diagnose ? &Selected : nullptr)) | |||
9389 | return true; | |||
9390 | ||||
9391 | if (Diagnose) { | |||
9392 | if (ConstRHS) | |||
9393 | SubType.addConst(); | |||
9394 | ||||
9395 | if (!Selected && CSM == Sema::CXXDefaultConstructor) { | |||
9396 | S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor) | |||
9397 | << Kind << SubType.getUnqualifiedType(); | |||
9398 | if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD)) | |||
9399 | S.Diag(CD->getLocation(), diag::note_user_declared_ctor); | |||
9400 | } else if (!Selected) | |||
9401 | S.Diag(SubobjLoc, diag::note_nontrivial_no_copy) | |||
9402 | << Kind << SubType.getUnqualifiedType() << CSM << SubType; | |||
9403 | else if (Selected->isUserProvided()) { | |||
9404 | if (Kind == TSK_CompleteObject) | |||
9405 | S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided) | |||
9406 | << Kind << SubType.getUnqualifiedType() << CSM; | |||
9407 | else { | |||
9408 | S.Diag(SubobjLoc, diag::note_nontrivial_user_provided) | |||
9409 | << Kind << SubType.getUnqualifiedType() << CSM; | |||
9410 | S.Diag(Selected->getLocation(), diag::note_declared_at); | |||
9411 | } | |||
9412 | } else { | |||
9413 | if (Kind != TSK_CompleteObject) | |||
9414 | S.Diag(SubobjLoc, diag::note_nontrivial_subobject) | |||
9415 | << Kind << SubType.getUnqualifiedType() << CSM; | |||
9416 | ||||
9417 | // Explain why the defaulted or deleted special member isn't trivial. | |||
9418 | S.SpecialMemberIsTrivial(Selected, CSM, Sema::TAH_IgnoreTrivialABI, | |||
9419 | Diagnose); | |||
9420 | } | |||
9421 | } | |||
9422 | ||||
9423 | return false; | |||
9424 | } | |||
9425 | ||||
9426 | /// Check whether the members of a class type allow a special member to be | |||
9427 | /// trivial. | |||
9428 | static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD, | |||
9429 | Sema::CXXSpecialMember CSM, | |||
9430 | bool ConstArg, | |||
9431 | Sema::TrivialABIHandling TAH, | |||
9432 | bool Diagnose) { | |||
9433 | for (const auto *FI : RD->fields()) { | |||
9434 | if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) | |||
9435 | continue; | |||
9436 | ||||
9437 | QualType FieldType = S.Context.getBaseElementType(FI->getType()); | |||
9438 | ||||
9439 | // Pretend anonymous struct or union members are members of this class. | |||
9440 | if (FI->isAnonymousStructOrUnion()) { | |||
9441 | if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(), | |||
9442 | CSM, ConstArg, TAH, Diagnose)) | |||
9443 | return false; | |||
9444 | continue; | |||
9445 | } | |||
9446 | ||||
9447 | // C++11 [class.ctor]p5: | |||
9448 | // A default constructor is trivial if [...] | |||
9449 | // -- no non-static data member of its class has a | |||
9450 | // brace-or-equal-initializer | |||
9451 | if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) { | |||
9452 | if (Diagnose) | |||
9453 | S.Diag(FI->getLocation(), diag::note_nontrivial_default_member_init) | |||
9454 | << FI; | |||
9455 | return false; | |||
9456 | } | |||
9457 | ||||
9458 | // Objective C ARC 4.3.5: | |||
9459 | // [...] nontrivally ownership-qualified types are [...] not trivially | |||
9460 | // default constructible, copy constructible, move constructible, copy | |||
9461 | // assignable, move assignable, or destructible [...] | |||
9462 | if (FieldType.hasNonTrivialObjCLifetime()) { | |||
9463 | if (Diagnose) | |||
9464 | S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership) | |||
9465 | << RD << FieldType.getObjCLifetime(); | |||
9466 | return false; | |||
9467 | } | |||
9468 | ||||
9469 | bool ConstRHS = ConstArg && !FI->isMutable(); | |||
9470 | if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, ConstRHS, | |||
9471 | CSM, TSK_Field, TAH, Diagnose)) | |||
9472 | return false; | |||
9473 | } | |||
9474 | ||||
9475 | return true; | |||
9476 | } | |||
9477 | ||||
9478 | /// Diagnose why the specified class does not have a trivial special member of | |||
9479 | /// the given kind. | |||
9480 | void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) { | |||
9481 | QualType Ty = Context.getRecordType(RD); | |||
9482 | ||||
9483 | bool ConstArg = (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment); | |||
9484 | checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, ConstArg, CSM, | |||
9485 | TSK_CompleteObject, TAH_IgnoreTrivialABI, | |||
9486 | /*Diagnose*/true); | |||
9487 | } | |||
9488 | ||||
9489 | /// Determine whether a defaulted or deleted special member function is trivial, | |||
9490 | /// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12, | |||
9491 | /// C++11 [class.copy]p25, and C++11 [class.dtor]p5. | |||
9492 | bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM, | |||
9493 | TrivialABIHandling TAH, bool Diagnose) { | |||
9494 | assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough")((!MD->isUserProvided() && CSM != CXXInvalid && "not special enough") ? static_cast<void> (0) : __assert_fail ("!MD->isUserProvided() && CSM != CXXInvalid && \"not special enough\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 9494, __PRETTY_FUNCTION__)); | |||
9495 | ||||
9496 | CXXRecordDecl *RD = MD->getParent(); | |||
9497 | ||||
9498 | bool ConstArg = false; | |||
9499 | ||||
9500 | // C++11 [class.copy]p12, p25: [DR1593] | |||
9501 | // A [special member] is trivial if [...] its parameter-type-list is | |||
9502 | // equivalent to the parameter-type-list of an implicit declaration [...] | |||
9503 | switch (CSM) { | |||
9504 | case CXXDefaultConstructor: | |||
9505 | case CXXDestructor: | |||
9506 | // Trivial default constructors and destructors cannot have parameters. | |||
9507 | break; | |||
9508 | ||||
9509 | case CXXCopyConstructor: | |||
9510 | case CXXCopyAssignment: { | |||
9511 | // Trivial copy operations always have const, non-volatile parameter types. | |||
9512 | ConstArg = true; | |||
9513 | const ParmVarDecl *Param0 = MD->getParamDecl(0); | |||
9514 | const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>(); | |||
9515 | if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) { | |||
9516 | if (Diagnose) | |||
9517 | Diag(Param0->getLocation(), diag::note_nontrivial_param_type) | |||
9518 | << Param0->getSourceRange() << Param0->getType() | |||
9519 | << Context.getLValueReferenceType( | |||
9520 | Context.getRecordType(RD).withConst()); | |||
9521 | return false; | |||
9522 | } | |||
9523 | break; | |||
9524 | } | |||
9525 | ||||
9526 | case CXXMoveConstructor: | |||
9527 | case CXXMoveAssignment: { | |||
9528 | // Trivial move operations always have non-cv-qualified parameters. | |||
9529 | const ParmVarDecl *Param0 = MD->getParamDecl(0); | |||
9530 | const RValueReferenceType *RT = | |||
9531 | Param0->getType()->getAs<RValueReferenceType>(); | |||
9532 | if (!RT || RT->getPointeeType().getCVRQualifiers()) { | |||
9533 | if (Diagnose) | |||
9534 | Diag(Param0->getLocation(), diag::note_nontrivial_param_type) | |||
9535 | << Param0->getSourceRange() << Param0->getType() | |||
9536 | << Context.getRValueReferenceType(Context.getRecordType(RD)); | |||
9537 | return false; | |||
9538 | } | |||
9539 | break; | |||
9540 | } | |||
9541 | ||||
9542 | case CXXInvalid: | |||
9543 | llvm_unreachable("not a special member")::llvm::llvm_unreachable_internal("not a special member", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 9543); | |||
9544 | } | |||
9545 | ||||
9546 | if (MD->getMinRequiredArguments() < MD->getNumParams()) { | |||
9547 | if (Diagnose) | |||
9548 | Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(), | |||
9549 | diag::note_nontrivial_default_arg) | |||
9550 | << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange(); | |||
9551 | return false; | |||
9552 | } | |||
9553 | if (MD->isVariadic()) { | |||
9554 | if (Diagnose) | |||
9555 | Diag(MD->getLocation(), diag::note_nontrivial_variadic); | |||
9556 | return false; | |||
9557 | } | |||
9558 | ||||
9559 | // C++11 [class.ctor]p5, C++11 [class.dtor]p5: | |||
9560 | // A copy/move [constructor or assignment operator] is trivial if | |||
9561 | // -- the [member] selected to copy/move each direct base class subobject | |||
9562 | // is trivial | |||
9563 | // | |||
9564 | // C++11 [class.copy]p12, C++11 [class.copy]p25: | |||
9565 | // A [default constructor or destructor] is trivial if | |||
9566 | // -- all the direct base classes have trivial [default constructors or | |||
9567 | // destructors] | |||
9568 | for (const auto &BI : RD->bases()) | |||
9569 | if (!checkTrivialSubobjectCall(*this, BI.getBeginLoc(), BI.getType(), | |||
9570 | ConstArg, CSM, TSK_BaseClass, TAH, Diagnose)) | |||
9571 | return false; | |||
9572 | ||||
9573 | // C++11 [class.ctor]p5, C++11 [class.dtor]p5: | |||
9574 | // A copy/move [constructor or assignment operator] for a class X is | |||
9575 | // trivial if | |||
9576 | // -- for each non-static data member of X that is of class type (or array | |||
9577 | // thereof), the constructor selected to copy/move that member is | |||
9578 | // trivial | |||
9579 | // | |||
9580 | // C++11 [class.copy]p12, C++11 [class.copy]p25: | |||
9581 | // A [default constructor or destructor] is trivial if | |||
9582 | // -- for all of the non-static data members of its class that are of class | |||
9583 | // type (or array thereof), each such class has a trivial [default | |||
9584 | // constructor or destructor] | |||
9585 | if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, TAH, Diagnose)) | |||
9586 | return false; | |||
9587 | ||||
9588 | // C++11 [class.dtor]p5: | |||
9589 | // A destructor is trivial if [...] | |||
9590 | // -- the destructor is not virtual | |||
9591 | if (CSM == CXXDestructor && MD->isVirtual()) { | |||
9592 | if (Diagnose) | |||
9593 | Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD; | |||
9594 | return false; | |||
9595 | } | |||
9596 | ||||
9597 | // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25: | |||
9598 | // A [special member] for class X is trivial if [...] | |||
9599 | // -- class X has no virtual functions and no virtual base classes | |||
9600 | if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) { | |||
9601 | if (!Diagnose) | |||
9602 | return false; | |||
9603 | ||||
9604 | if (RD->getNumVBases()) { | |||
9605 | // Check for virtual bases. We already know that the corresponding | |||
9606 | // member in all bases is trivial, so vbases must all be direct. | |||
9607 | CXXBaseSpecifier &BS = *RD->vbases_begin(); | |||
9608 | assert(BS.isVirtual())((BS.isVirtual()) ? static_cast<void> (0) : __assert_fail ("BS.isVirtual()", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 9608, __PRETTY_FUNCTION__)); | |||
9609 | Diag(BS.getBeginLoc(), diag::note_nontrivial_has_virtual) << RD << 1; | |||
9610 | return false; | |||
9611 | } | |||
9612 | ||||
9613 | // Must have a virtual method. | |||
9614 | for (const auto *MI : RD->methods()) { | |||
9615 | if (MI->isVirtual()) { | |||
9616 | SourceLocation MLoc = MI->getBeginLoc(); | |||
9617 | Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0; | |||
9618 | return false; | |||
9619 | } | |||
9620 | } | |||
9621 | ||||
9622 | llvm_unreachable("dynamic class with no vbases and no virtual functions")::llvm::llvm_unreachable_internal("dynamic class with no vbases and no virtual functions" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 9622); | |||
9623 | } | |||
9624 | ||||
9625 | // Looks like it's trivial! | |||
9626 | return true; | |||
9627 | } | |||
9628 | ||||
9629 | namespace { | |||
9630 | struct FindHiddenVirtualMethod { | |||
9631 | Sema *S; | |||
9632 | CXXMethodDecl *Method; | |||
9633 | llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; | |||
9634 | SmallVector<CXXMethodDecl *, 8> OverloadedMethods; | |||
9635 | ||||
9636 | private: | |||
9637 | /// Check whether any most overridden method from MD in Methods | |||
9638 | static bool CheckMostOverridenMethods( | |||
9639 | const CXXMethodDecl *MD, | |||
9640 | const llvm::SmallPtrSetImpl<const CXXMethodDecl *> &Methods) { | |||
9641 | if (MD->size_overridden_methods() == 0) | |||
9642 | return Methods.count(MD->getCanonicalDecl()); | |||
9643 | for (const CXXMethodDecl *O : MD->overridden_methods()) | |||
9644 | if (CheckMostOverridenMethods(O, Methods)) | |||
9645 | return true; | |||
9646 | return false; | |||
9647 | } | |||
9648 | ||||
9649 | public: | |||
9650 | /// Member lookup function that determines whether a given C++ | |||
9651 | /// method overloads virtual methods in a base class without overriding any, | |||
9652 | /// to be used with CXXRecordDecl::lookupInBases(). | |||
9653 | bool operator()(const CXXBaseSpecifier *Specifier, CXXBasePath &Path) { | |||
9654 | RecordDecl *BaseRecord = | |||
9655 | Specifier->getType()->castAs<RecordType>()->getDecl(); | |||
9656 | ||||
9657 | DeclarationName Name = Method->getDeclName(); | |||
9658 | assert(Name.getNameKind() == DeclarationName::Identifier)((Name.getNameKind() == DeclarationName::Identifier) ? static_cast <void> (0) : __assert_fail ("Name.getNameKind() == DeclarationName::Identifier" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 9658, __PRETTY_FUNCTION__)); | |||
9659 | ||||
9660 | bool foundSameNameMethod = false; | |||
9661 | SmallVector<CXXMethodDecl *, 8> overloadedMethods; | |||
9662 | for (Path.Decls = BaseRecord->lookup(Name); !Path.Decls.empty(); | |||
9663 | Path.Decls = Path.Decls.slice(1)) { | |||
9664 | NamedDecl *D = Path.Decls.front(); | |||
9665 | if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { | |||
9666 | MD = MD->getCanonicalDecl(); | |||
9667 | foundSameNameMethod = true; | |||
9668 | // Interested only in hidden virtual methods. | |||
9669 | if (!MD->isVirtual()) | |||
9670 | continue; | |||
9671 | // If the method we are checking overrides a method from its base | |||
9672 | // don't warn about the other overloaded methods. Clang deviates from | |||
9673 | // GCC by only diagnosing overloads of inherited virtual functions that | |||
9674 | // do not override any other virtual functions in the base. GCC's | |||
9675 | // -Woverloaded-virtual diagnoses any derived function hiding a virtual | |||
9676 | // function from a base class. These cases may be better served by a | |||
9677 | // warning (not specific to virtual functions) on call sites when the | |||
9678 | // call would select a different function from the base class, were it | |||
9679 | // visible. | |||
9680 | // See FIXME in test/SemaCXX/warn-overload-virtual.cpp for an example. | |||
9681 | if (!S->IsOverload(Method, MD, false)) | |||
9682 | return true; | |||
9683 | // Collect the overload only if its hidden. | |||
9684 | if (!CheckMostOverridenMethods(MD, OverridenAndUsingBaseMethods)) | |||
9685 | overloadedMethods.push_back(MD); | |||
9686 | } | |||
9687 | } | |||
9688 | ||||
9689 | if (foundSameNameMethod) | |||
9690 | OverloadedMethods.append(overloadedMethods.begin(), | |||
9691 | overloadedMethods.end()); | |||
9692 | return foundSameNameMethod; | |||
9693 | } | |||
9694 | }; | |||
9695 | } // end anonymous namespace | |||
9696 | ||||
9697 | /// Add the most overriden methods from MD to Methods | |||
9698 | static void AddMostOverridenMethods(const CXXMethodDecl *MD, | |||
9699 | llvm::SmallPtrSetImpl<const CXXMethodDecl *>& Methods) { | |||
9700 | if (MD->size_overridden_methods() == 0) | |||
9701 | Methods.insert(MD->getCanonicalDecl()); | |||
9702 | else | |||
9703 | for (const CXXMethodDecl *O : MD->overridden_methods()) | |||
9704 | AddMostOverridenMethods(O, Methods); | |||
9705 | } | |||
9706 | ||||
9707 | /// Check if a method overloads virtual methods in a base class without | |||
9708 | /// overriding any. | |||
9709 | void Sema::FindHiddenVirtualMethods(CXXMethodDecl *MD, | |||
9710 | SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) { | |||
9711 | if (!MD->getDeclName().isIdentifier()) | |||
9712 | return; | |||
9713 | ||||
9714 | CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. | |||
9715 | /*bool RecordPaths=*/false, | |||
9716 | /*bool DetectVirtual=*/false); | |||
9717 | FindHiddenVirtualMethod FHVM; | |||
9718 | FHVM.Method = MD; | |||
9719 | FHVM.S = this; | |||
9720 | ||||
9721 | // Keep the base methods that were overridden or introduced in the subclass | |||
9722 | // by 'using' in a set. A base method not in this set is hidden. | |||
9723 | CXXRecordDecl *DC = MD->getParent(); | |||
9724 | DeclContext::lookup_result R = DC->lookup(MD->getDeclName()); | |||
9725 | for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) { | |||
9726 | NamedDecl *ND = *I; | |||
9727 | if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I)) | |||
9728 | ND = shad->getTargetDecl(); | |||
9729 | if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) | |||
9730 | AddMostOverridenMethods(MD, FHVM.OverridenAndUsingBaseMethods); | |||
9731 | } | |||
9732 | ||||
9733 | if (DC->lookupInBases(FHVM, Paths)) | |||
9734 | OverloadedMethods = FHVM.OverloadedMethods; | |||
9735 | } | |||
9736 | ||||
9737 | void Sema::NoteHiddenVirtualMethods(CXXMethodDecl *MD, | |||
9738 | SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) { | |||
9739 | for (unsigned i = 0, e = OverloadedMethods.size(); i != e; ++i) { | |||
9740 | CXXMethodDecl *overloadedMD = OverloadedMethods[i]; | |||
9741 | PartialDiagnostic PD = PDiag( | |||
9742 | diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; | |||
9743 | HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType()); | |||
9744 | Diag(overloadedMD->getLocation(), PD); | |||
9745 | } | |||
9746 | } | |||
9747 | ||||
9748 | /// Diagnose methods which overload virtual methods in a base class | |||
9749 | /// without overriding any. | |||
9750 | void Sema::DiagnoseHiddenVirtualMethods(CXXMethodDecl *MD) { | |||
9751 | if (MD->isInvalidDecl()) | |||
9752 | return; | |||
9753 | ||||
9754 | if (Diags.isIgnored(diag::warn_overloaded_virtual, MD->getLocation())) | |||
9755 | return; | |||
9756 | ||||
9757 | SmallVector<CXXMethodDecl *, 8> OverloadedMethods; | |||
9758 | FindHiddenVirtualMethods(MD, OverloadedMethods); | |||
9759 | if (!OverloadedMethods.empty()) { | |||
9760 | Diag(MD->getLocation(), diag::warn_overloaded_virtual) | |||
9761 | << MD << (OverloadedMethods.size() > 1); | |||
9762 | ||||
9763 | NoteHiddenVirtualMethods(MD, OverloadedMethods); | |||
9764 | } | |||
9765 | } | |||
9766 | ||||
9767 | void Sema::checkIllFormedTrivialABIStruct(CXXRecordDecl &RD) { | |||
9768 | auto PrintDiagAndRemoveAttr = [&](unsigned N) { | |||
9769 | // No diagnostics if this is a template instantiation. | |||
9770 | if (!isTemplateInstantiation(RD.getTemplateSpecializationKind())) { | |||
9771 | Diag(RD.getAttr<TrivialABIAttr>()->getLocation(), | |||
9772 | diag::ext_cannot_use_trivial_abi) << &RD; | |||
9773 | Diag(RD.getAttr<TrivialABIAttr>()->getLocation(), | |||
9774 | diag::note_cannot_use_trivial_abi_reason) << &RD << N; | |||
9775 | } | |||
9776 | RD.dropAttr<TrivialABIAttr>(); | |||
9777 | }; | |||
9778 | ||||
9779 | // Ill-formed if the copy and move constructors are deleted. | |||
9780 | auto HasNonDeletedCopyOrMoveConstructor = [&]() { | |||
9781 | // If the type is dependent, then assume it might have | |||
9782 | // implicit copy or move ctor because we won't know yet at this point. | |||
9783 | if (RD.isDependentType()) | |||
9784 | return true; | |||
9785 | if (RD.needsImplicitCopyConstructor() && | |||
9786 | !RD.defaultedCopyConstructorIsDeleted()) | |||
9787 | return true; | |||
9788 | if (RD.needsImplicitMoveConstructor() && | |||
9789 | !RD.defaultedMoveConstructorIsDeleted()) | |||
9790 | return true; | |||
9791 | for (const CXXConstructorDecl *CD : RD.ctors()) | |||
9792 | if (CD->isCopyOrMoveConstructor() && !CD->isDeleted()) | |||
9793 | return true; | |||
9794 | return false; | |||
9795 | }; | |||
9796 | ||||
9797 | if (!HasNonDeletedCopyOrMoveConstructor()) { | |||
9798 | PrintDiagAndRemoveAttr(0); | |||
9799 | return; | |||
9800 | } | |||
9801 | ||||
9802 | // Ill-formed if the struct has virtual functions. | |||
9803 | if (RD.isPolymorphic()) { | |||
9804 | PrintDiagAndRemoveAttr(1); | |||
9805 | return; | |||
9806 | } | |||
9807 | ||||
9808 | for (const auto &B : RD.bases()) { | |||
9809 | // Ill-formed if the base class is non-trivial for the purpose of calls or a | |||
9810 | // virtual base. | |||
9811 | if (!B.getType()->isDependentType() && | |||
9812 | !B.getType()->getAsCXXRecordDecl()->canPassInRegisters()) { | |||
9813 | PrintDiagAndRemoveAttr(2); | |||
9814 | return; | |||
9815 | } | |||
9816 | ||||
9817 | if (B.isVirtual()) { | |||
9818 | PrintDiagAndRemoveAttr(3); | |||
9819 | return; | |||
9820 | } | |||
9821 | } | |||
9822 | ||||
9823 | for (const auto *FD : RD.fields()) { | |||
9824 | // Ill-formed if the field is an ObjectiveC pointer or of a type that is | |||
9825 | // non-trivial for the purpose of calls. | |||
9826 | QualType FT = FD->getType(); | |||
9827 | if (FT.getObjCLifetime() == Qualifiers::OCL_Weak) { | |||
9828 | PrintDiagAndRemoveAttr(4); | |||
9829 | return; | |||
9830 | } | |||
9831 | ||||
9832 | if (const auto *RT = FT->getBaseElementTypeUnsafe()->getAs<RecordType>()) | |||
9833 | if (!RT->isDependentType() && | |||
9834 | !cast<CXXRecordDecl>(RT->getDecl())->canPassInRegisters()) { | |||
9835 | PrintDiagAndRemoveAttr(5); | |||
9836 | return; | |||
9837 | } | |||
9838 | } | |||
9839 | } | |||
9840 | ||||
9841 | void Sema::ActOnFinishCXXMemberSpecification( | |||
9842 | Scope *S, SourceLocation RLoc, Decl *TagDecl, SourceLocation LBrac, | |||
9843 | SourceLocation RBrac, const ParsedAttributesView &AttrList) { | |||
9844 | if (!TagDecl) | |||
9845 | return; | |||
9846 | ||||
9847 | AdjustDeclIfTemplate(TagDecl); | |||
9848 | ||||
9849 | for (const ParsedAttr &AL : AttrList) { | |||
9850 | if (AL.getKind() != ParsedAttr::AT_Visibility) | |||
9851 | continue; | |||
9852 | AL.setInvalid(); | |||
9853 | Diag(AL.getLoc(), diag::warn_attribute_after_definition_ignored) << AL; | |||
9854 | } | |||
9855 | ||||
9856 | ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( | |||
9857 | // strict aliasing violation! | |||
9858 | reinterpret_cast<Decl**>(FieldCollector->getCurFields()), | |||
9859 | FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); | |||
9860 | ||||
9861 | CheckCompletedCXXClass(S, cast<CXXRecordDecl>(TagDecl)); | |||
9862 | } | |||
9863 | ||||
9864 | /// Find the equality comparison functions that should be implicitly declared | |||
9865 | /// in a given class definition, per C++2a [class.compare.default]p3. | |||
9866 | static void findImplicitlyDeclaredEqualityComparisons( | |||
9867 | ASTContext &Ctx, CXXRecordDecl *RD, | |||
9868 | llvm::SmallVectorImpl<FunctionDecl *> &Spaceships) { | |||
9869 | DeclarationName EqEq = Ctx.DeclarationNames.getCXXOperatorName(OO_EqualEqual); | |||
9870 | if (!RD->lookup(EqEq).empty()) | |||
9871 | // Member operator== explicitly declared: no implicit operator==s. | |||
9872 | return; | |||
9873 | ||||
9874 | // Traverse friends looking for an '==' or a '<=>'. | |||
9875 | for (FriendDecl *Friend : RD->friends()) { | |||
9876 | FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(Friend->getFriendDecl()); | |||
9877 | if (!FD) continue; | |||
9878 | ||||
9879 | if (FD->getOverloadedOperator() == OO_EqualEqual) { | |||
9880 | // Friend operator== explicitly declared: no implicit operator==s. | |||
9881 | Spaceships.clear(); | |||
9882 | return; | |||
9883 | } | |||
9884 | ||||
9885 | if (FD->getOverloadedOperator() == OO_Spaceship && | |||
9886 | FD->isExplicitlyDefaulted()) | |||
9887 | Spaceships.push_back(FD); | |||
9888 | } | |||
9889 | ||||
9890 | // Look for members named 'operator<=>'. | |||
9891 | DeclarationName Cmp = Ctx.DeclarationNames.getCXXOperatorName(OO_Spaceship); | |||
9892 | for (NamedDecl *ND : RD->lookup(Cmp)) { | |||
9893 | // Note that we could find a non-function here (either a function template | |||
9894 | // or a using-declaration). Neither case results in an implicit | |||
9895 | // 'operator=='. | |||
9896 | if (auto *FD = dyn_cast<FunctionDecl>(ND)) | |||
9897 | if (FD->isExplicitlyDefaulted()) | |||
9898 | Spaceships.push_back(FD); | |||
9899 | } | |||
9900 | } | |||
9901 | ||||
9902 | /// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared | |||
9903 | /// special functions, such as the default constructor, copy | |||
9904 | /// constructor, or destructor, to the given C++ class (C++ | |||
9905 | /// [special]p1). This routine can only be executed just before the | |||
9906 | /// definition of the class is complete. | |||
9907 | void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { | |||
9908 | // Don't add implicit special members to templated classes. | |||
9909 | // FIXME: This means unqualified lookups for 'operator=' within a class | |||
9910 | // template don't work properly. | |||
9911 | if (!ClassDecl->isDependentType()) { | |||
9912 | if (ClassDecl->needsImplicitDefaultConstructor()) { | |||
9913 | ++getASTContext().NumImplicitDefaultConstructors; | |||
9914 | ||||
9915 | if (ClassDecl->hasInheritedConstructor()) | |||
9916 | DeclareImplicitDefaultConstructor(ClassDecl); | |||
9917 | } | |||
9918 | ||||
9919 | if (ClassDecl->needsImplicitCopyConstructor()) { | |||
9920 | ++getASTContext().NumImplicitCopyConstructors; | |||
9921 | ||||
9922 | // If the properties or semantics of the copy constructor couldn't be | |||
9923 | // determined while the class was being declared, force a declaration | |||
9924 | // of it now. | |||
9925 | if (ClassDecl->needsOverloadResolutionForCopyConstructor() || | |||
9926 | ClassDecl->hasInheritedConstructor()) | |||
9927 | DeclareImplicitCopyConstructor(ClassDecl); | |||
9928 | // For the MS ABI we need to know whether the copy ctor is deleted. A | |||
9929 | // prerequisite for deleting the implicit copy ctor is that the class has | |||
9930 | // a move ctor or move assignment that is either user-declared or whose | |||
9931 | // semantics are inherited from a subobject. FIXME: We should provide a | |||
9932 | // more direct way for CodeGen to ask whether the constructor was deleted. | |||
9933 | else if (Context.getTargetInfo().getCXXABI().isMicrosoft() && | |||
9934 | (ClassDecl->hasUserDeclaredMoveConstructor() || | |||
9935 | ClassDecl->needsOverloadResolutionForMoveConstructor() || | |||
9936 | ClassDecl->hasUserDeclaredMoveAssignment() || | |||
9937 | ClassDecl->needsOverloadResolutionForMoveAssignment())) | |||
9938 | DeclareImplicitCopyConstructor(ClassDecl); | |||
9939 | } | |||
9940 | ||||
9941 | if (getLangOpts().CPlusPlus11 && | |||
9942 | ClassDecl->needsImplicitMoveConstructor()) { | |||
9943 | ++getASTContext().NumImplicitMoveConstructors; | |||
9944 | ||||
9945 | if (ClassDecl->needsOverloadResolutionForMoveConstructor() || | |||
9946 | ClassDecl->hasInheritedConstructor()) | |||
9947 | DeclareImplicitMoveConstructor(ClassDecl); | |||
9948 | } | |||
9949 | ||||
9950 | if (ClassDecl->needsImplicitCopyAssignment()) { | |||
9951 | ++getASTContext().NumImplicitCopyAssignmentOperators; | |||
9952 | ||||
9953 | // If we have a dynamic class, then the copy assignment operator may be | |||
9954 | // virtual, so we have to declare it immediately. This ensures that, e.g., | |||
9955 | // it shows up in the right place in the vtable and that we diagnose | |||
9956 | // problems with the implicit exception specification. | |||
9957 | if (ClassDecl->isDynamicClass() || | |||
9958 | ClassDecl->needsOverloadResolutionForCopyAssignment() || | |||
9959 | ClassDecl->hasInheritedAssignment()) | |||
9960 | DeclareImplicitCopyAssignment(ClassDecl); | |||
9961 | } | |||
9962 | ||||
9963 | if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) { | |||
9964 | ++getASTContext().NumImplicitMoveAssignmentOperators; | |||
9965 | ||||
9966 | // Likewise for the move assignment operator. | |||
9967 | if (ClassDecl->isDynamicClass() || | |||
9968 | ClassDecl->needsOverloadResolutionForMoveAssignment() || | |||
9969 | ClassDecl->hasInheritedAssignment()) | |||
9970 | DeclareImplicitMoveAssignment(ClassDecl); | |||
9971 | } | |||
9972 | ||||
9973 | if (ClassDecl->needsImplicitDestructor()) { | |||
9974 | ++getASTContext().NumImplicitDestructors; | |||
9975 | ||||
9976 | // If we have a dynamic class, then the destructor may be virtual, so we | |||
9977 | // have to declare the destructor immediately. This ensures that, e.g., it | |||
9978 | // shows up in the right place in the vtable and that we diagnose problems | |||
9979 | // with the implicit exception specification. | |||
9980 | if (ClassDecl->isDynamicClass() || | |||
9981 | ClassDecl->needsOverloadResolutionForDestructor()) | |||
9982 | DeclareImplicitDestructor(ClassDecl); | |||
9983 | } | |||
9984 | } | |||
9985 | ||||
9986 | // C++2a [class.compare.default]p3: | |||
9987 | // If the member-specification does not explicitly declare any member or | |||
9988 | // friend named operator==, an == operator function is declared implicitly | |||
9989 | // for each defaulted three-way comparison operator function defined in | |||
9990 | // the member-specification | |||
9991 | // FIXME: Consider doing this lazily. | |||
9992 | // We do this during the initial parse for a class template, not during | |||
9993 | // instantiation, so that we can handle unqualified lookups for 'operator==' | |||
9994 | // when parsing the template. | |||
9995 | if (getLangOpts().CPlusPlus20 && !inTemplateInstantiation()) { | |||
9996 | llvm::SmallVector<FunctionDecl *, 4> DefaultedSpaceships; | |||
9997 | findImplicitlyDeclaredEqualityComparisons(Context, ClassDecl, | |||
9998 | DefaultedSpaceships); | |||
9999 | for (auto *FD : DefaultedSpaceships) | |||
10000 | DeclareImplicitEqualityComparison(ClassDecl, FD); | |||
10001 | } | |||
10002 | } | |||
10003 | ||||
10004 | unsigned | |||
10005 | Sema::ActOnReenterTemplateScope(Decl *D, | |||
10006 | llvm::function_ref<Scope *()> EnterScope) { | |||
10007 | if (!D) | |||
10008 | return 0; | |||
10009 | AdjustDeclIfTemplate(D); | |||
10010 | ||||
10011 | // In order to get name lookup right, reenter template scopes in order from | |||
10012 | // outermost to innermost. | |||
10013 | SmallVector<TemplateParameterList *, 4> ParameterLists; | |||
10014 | DeclContext *LookupDC = dyn_cast<DeclContext>(D); | |||
10015 | ||||
10016 | if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)) { | |||
10017 | for (unsigned i = 0; i < DD->getNumTemplateParameterLists(); ++i) | |||
10018 | ParameterLists.push_back(DD->getTemplateParameterList(i)); | |||
10019 | ||||
10020 | if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { | |||
10021 | if (FunctionTemplateDecl *FTD = FD->getDescribedFunctionTemplate()) | |||
10022 | ParameterLists.push_back(FTD->getTemplateParameters()); | |||
10023 | } else if (VarDecl *VD = dyn_cast<VarDecl>(D)) { | |||
10024 | LookupDC = VD->getDeclContext(); | |||
10025 | ||||
10026 | if (VarTemplateDecl *VTD = VD->getDescribedVarTemplate()) | |||
10027 | ParameterLists.push_back(VTD->getTemplateParameters()); | |||
10028 | else if (auto *PSD = dyn_cast<VarTemplatePartialSpecializationDecl>(D)) | |||
10029 | ParameterLists.push_back(PSD->getTemplateParameters()); | |||
10030 | } | |||
10031 | } else if (TagDecl *TD = dyn_cast<TagDecl>(D)) { | |||
10032 | for (unsigned i = 0; i < TD->getNumTemplateParameterLists(); ++i) | |||
10033 | ParameterLists.push_back(TD->getTemplateParameterList(i)); | |||
10034 | ||||
10035 | if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) { | |||
10036 | if (ClassTemplateDecl *CTD = RD->getDescribedClassTemplate()) | |||
10037 | ParameterLists.push_back(CTD->getTemplateParameters()); | |||
10038 | else if (auto *PSD = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) | |||
10039 | ParameterLists.push_back(PSD->getTemplateParameters()); | |||
10040 | } | |||
10041 | } | |||
10042 | // FIXME: Alias declarations and concepts. | |||
10043 | ||||
10044 | unsigned Count = 0; | |||
10045 | Scope *InnermostTemplateScope = nullptr; | |||
10046 | for (TemplateParameterList *Params : ParameterLists) { | |||
10047 | // Ignore explicit specializations; they don't contribute to the template | |||
10048 | // depth. | |||
10049 | if (Params->size() == 0) | |||
10050 | continue; | |||
10051 | ||||
10052 | InnermostTemplateScope = EnterScope(); | |||
10053 | for (NamedDecl *Param : *Params) { | |||
10054 | if (Param->getDeclName()) { | |||
10055 | InnermostTemplateScope->AddDecl(Param); | |||
10056 | IdResolver.AddDecl(Param); | |||
10057 | } | |||
10058 | } | |||
10059 | ++Count; | |||
10060 | } | |||
10061 | ||||
10062 | // Associate the new template scopes with the corresponding entities. | |||
10063 | if (InnermostTemplateScope) { | |||
10064 | assert(LookupDC && "no enclosing DeclContext for template lookup")((LookupDC && "no enclosing DeclContext for template lookup" ) ? static_cast<void> (0) : __assert_fail ("LookupDC && \"no enclosing DeclContext for template lookup\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 10064, __PRETTY_FUNCTION__)); | |||
10065 | EnterTemplatedContext(InnermostTemplateScope, LookupDC); | |||
10066 | } | |||
10067 | ||||
10068 | return Count; | |||
10069 | } | |||
10070 | ||||
10071 | void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { | |||
10072 | if (!RecordD) return; | |||
10073 | AdjustDeclIfTemplate(RecordD); | |||
10074 | CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); | |||
10075 | PushDeclContext(S, Record); | |||
10076 | } | |||
10077 | ||||
10078 | void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { | |||
10079 | if (!RecordD) return; | |||
10080 | PopDeclContext(); | |||
10081 | } | |||
10082 | ||||
10083 | /// This is used to implement the constant expression evaluation part of the | |||
10084 | /// attribute enable_if extension. There is nothing in standard C++ which would | |||
10085 | /// require reentering parameters. | |||
10086 | void Sema::ActOnReenterCXXMethodParameter(Scope *S, ParmVarDecl *Param) { | |||
10087 | if (!Param) | |||
10088 | return; | |||
10089 | ||||
10090 | S->AddDecl(Param); | |||
10091 | if (Param->getDeclName()) | |||
10092 | IdResolver.AddDecl(Param); | |||
10093 | } | |||
10094 | ||||
10095 | /// ActOnStartDelayedCXXMethodDeclaration - We have completed | |||
10096 | /// parsing a top-level (non-nested) C++ class, and we are now | |||
10097 | /// parsing those parts of the given Method declaration that could | |||
10098 | /// not be parsed earlier (C++ [class.mem]p2), such as default | |||
10099 | /// arguments. This action should enter the scope of the given | |||
10100 | /// Method declaration as if we had just parsed the qualified method | |||
10101 | /// name. However, it should not bring the parameters into scope; | |||
10102 | /// that will be performed by ActOnDelayedCXXMethodParameter. | |||
10103 | void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { | |||
10104 | } | |||
10105 | ||||
10106 | /// ActOnDelayedCXXMethodParameter - We've already started a delayed | |||
10107 | /// C++ method declaration. We're (re-)introducing the given | |||
10108 | /// function parameter into scope for use in parsing later parts of | |||
10109 | /// the method declaration. For example, we could see an | |||
10110 | /// ActOnParamDefaultArgument event for this parameter. | |||
10111 | void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { | |||
10112 | if (!ParamD) | |||
10113 | return; | |||
10114 | ||||
10115 | ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); | |||
10116 | ||||
10117 | S->AddDecl(Param); | |||
10118 | if (Param->getDeclName()) | |||
10119 | IdResolver.AddDecl(Param); | |||
10120 | } | |||
10121 | ||||
10122 | /// ActOnFinishDelayedCXXMethodDeclaration - We have finished | |||
10123 | /// processing the delayed method declaration for Method. The method | |||
10124 | /// declaration is now considered finished. There may be a separate | |||
10125 | /// ActOnStartOfFunctionDef action later (not necessarily | |||
10126 | /// immediately!) for this method, if it was also defined inside the | |||
10127 | /// class body. | |||
10128 | void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { | |||
10129 | if (!MethodD) | |||
10130 | return; | |||
10131 | ||||
10132 | AdjustDeclIfTemplate(MethodD); | |||
10133 | ||||
10134 | FunctionDecl *Method = cast<FunctionDecl>(MethodD); | |||
10135 | ||||
10136 | // Now that we have our default arguments, check the constructor | |||
10137 | // again. It could produce additional diagnostics or affect whether | |||
10138 | // the class has implicitly-declared destructors, among other | |||
10139 | // things. | |||
10140 | if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) | |||
10141 | CheckConstructor(Constructor); | |||
10142 | ||||
10143 | // Check the default arguments, which we may have added. | |||
10144 | if (!Method->isInvalidDecl()) | |||
10145 | CheckCXXDefaultArguments(Method); | |||
10146 | } | |||
10147 | ||||
10148 | // Emit the given diagnostic for each non-address-space qualifier. | |||
10149 | // Common part of CheckConstructorDeclarator and CheckDestructorDeclarator. | |||
10150 | static void checkMethodTypeQualifiers(Sema &S, Declarator &D, unsigned DiagID) { | |||
10151 | const DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); | |||
10152 | if (FTI.hasMethodTypeQualifiers() && !D.isInvalidType()) { | |||
10153 | bool DiagOccured = false; | |||
10154 | FTI.MethodQualifiers->forEachQualifier( | |||
10155 | [DiagID, &S, &DiagOccured](DeclSpec::TQ, StringRef QualName, | |||
10156 | SourceLocation SL) { | |||
10157 | // This diagnostic should be emitted on any qualifier except an addr | |||
10158 | // space qualifier. However, forEachQualifier currently doesn't visit | |||
10159 | // addr space qualifiers, so there's no way to write this condition | |||
10160 | // right now; we just diagnose on everything. | |||
10161 | S.Diag(SL, DiagID) << QualName << SourceRange(SL); | |||
10162 | DiagOccured = true; | |||
10163 | }); | |||
10164 | if (DiagOccured) | |||
10165 | D.setInvalidType(); | |||
10166 | } | |||
10167 | } | |||
10168 | ||||
10169 | /// CheckConstructorDeclarator - Called by ActOnDeclarator to check | |||
10170 | /// the well-formedness of the constructor declarator @p D with type @p | |||
10171 | /// R. If there are any errors in the declarator, this routine will | |||
10172 | /// emit diagnostics and set the invalid bit to true. In any case, the type | |||
10173 | /// will be updated to reflect a well-formed type for the constructor and | |||
10174 | /// returned. | |||
10175 | QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, | |||
10176 | StorageClass &SC) { | |||
10177 | bool isVirtual = D.getDeclSpec().isVirtualSpecified(); | |||
10178 | ||||
10179 | // C++ [class.ctor]p3: | |||
10180 | // A constructor shall not be virtual (10.3) or static (9.4). A | |||
10181 | // constructor can be invoked for a const, volatile or const | |||
10182 | // volatile object. A constructor shall not be declared const, | |||
10183 | // volatile, or const volatile (9.3.2). | |||
10184 | if (isVirtual) { | |||
10185 | if (!D.isInvalidType()) | |||
10186 | Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) | |||
10187 | << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) | |||
10188 | << SourceRange(D.getIdentifierLoc()); | |||
10189 | D.setInvalidType(); | |||
10190 | } | |||
10191 | if (SC == SC_Static) { | |||
10192 | if (!D.isInvalidType()) | |||
10193 | Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) | |||
10194 | << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) | |||
10195 | << SourceRange(D.getIdentifierLoc()); | |||
10196 | D.setInvalidType(); | |||
10197 | SC = SC_None; | |||
10198 | } | |||
10199 | ||||
10200 | if (unsigned TypeQuals = D.getDeclSpec().getTypeQualifiers()) { | |||
10201 | diagnoseIgnoredQualifiers( | |||
10202 | diag::err_constructor_return_type, TypeQuals, SourceLocation(), | |||
10203 | D.getDeclSpec().getConstSpecLoc(), D.getDeclSpec().getVolatileSpecLoc(), | |||
10204 | D.getDeclSpec().getRestrictSpecLoc(), | |||
10205 | D.getDeclSpec().getAtomicSpecLoc()); | |||
10206 | D.setInvalidType(); | |||
10207 | } | |||
10208 | ||||
10209 | checkMethodTypeQualifiers(*this, D, diag::err_invalid_qualified_constructor); | |||
10210 | ||||
10211 | // C++0x [class.ctor]p4: | |||
10212 | // A constructor shall not be declared with a ref-qualifier. | |||
10213 | DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); | |||
10214 | if (FTI.hasRefQualifier()) { | |||
10215 | Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) | |||
10216 | << FTI.RefQualifierIsLValueRef | |||
10217 | << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); | |||
10218 | D.setInvalidType(); | |||
10219 | } | |||
10220 | ||||
10221 | // Rebuild the function type "R" without any type qualifiers (in | |||
10222 | // case any of the errors above fired) and with "void" as the | |||
10223 | // return type, since constructors don't have return types. | |||
10224 | const FunctionProtoType *Proto = R->castAs<FunctionProtoType>(); | |||
10225 | if (Proto->getReturnType() == Context.VoidTy && !D.isInvalidType()) | |||
10226 | return R; | |||
10227 | ||||
10228 | FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); | |||
10229 | EPI.TypeQuals = Qualifiers(); | |||
10230 | EPI.RefQualifier = RQ_None; | |||
10231 | ||||
10232 | return Context.getFunctionType(Context.VoidTy, Proto->getParamTypes(), EPI); | |||
10233 | } | |||
10234 | ||||
10235 | /// CheckConstructor - Checks a fully-formed constructor for | |||
10236 | /// well-formedness, issuing any diagnostics required. Returns true if | |||
10237 | /// the constructor declarator is invalid. | |||
10238 | void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { | |||
10239 | CXXRecordDecl *ClassDecl | |||
10240 | = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); | |||
10241 | if (!ClassDecl) | |||
10242 | return Constructor->setInvalidDecl(); | |||
10243 | ||||
10244 | // C++ [class.copy]p3: | |||
10245 | // A declaration of a constructor for a class X is ill-formed if | |||
10246 | // its first parameter is of type (optionally cv-qualified) X and | |||
10247 | // either there are no other parameters or else all other | |||
10248 | // parameters have default arguments. | |||
10249 | if (!Constructor->isInvalidDecl() && | |||
10250 | Constructor->hasOneParamOrDefaultArgs() && | |||
10251 | Constructor->getTemplateSpecializationKind() != | |||
10252 | TSK_ImplicitInstantiation) { | |||
10253 | QualType ParamType = Constructor->getParamDecl(0)->getType(); | |||
10254 | QualType ClassTy = Context.getTagDeclType(ClassDecl); | |||
10255 | if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { | |||
10256 | SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); | |||
10257 | const char *ConstRef | |||
10258 | = Constructor->getParamDecl(0)->getIdentifier() ? "const &" | |||
10259 | : " const &"; | |||
10260 | Diag(ParamLoc, diag::err_constructor_byvalue_arg) | |||
10261 | << FixItHint::CreateInsertion(ParamLoc, ConstRef); | |||
10262 | ||||
10263 | // FIXME: Rather that making the constructor invalid, we should endeavor | |||
10264 | // to fix the type. | |||
10265 | Constructor->setInvalidDecl(); | |||
10266 | } | |||
10267 | } | |||
10268 | } | |||
10269 | ||||
10270 | /// CheckDestructor - Checks a fully-formed destructor definition for | |||
10271 | /// well-formedness, issuing any diagnostics required. Returns true | |||
10272 | /// on error. | |||
10273 | bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { | |||
10274 | CXXRecordDecl *RD = Destructor->getParent(); | |||
10275 | ||||
10276 | if (!Destructor->getOperatorDelete() && Destructor->isVirtual()) { | |||
10277 | SourceLocation Loc; | |||
10278 | ||||
10279 | if (!Destructor->isImplicit()) | |||
10280 | Loc = Destructor->getLocation(); | |||
10281 | else | |||
10282 | Loc = RD->getLocation(); | |||
10283 | ||||
10284 | // If we have a virtual destructor, look up the deallocation function | |||
10285 | if (FunctionDecl *OperatorDelete = | |||
10286 | FindDeallocationFunctionForDestructor(Loc, RD)) { | |||
10287 | Expr *ThisArg = nullptr; | |||
10288 | ||||
10289 | // If the notional 'delete this' expression requires a non-trivial | |||
10290 | // conversion from 'this' to the type of a destroying operator delete's | |||
10291 | // first parameter, perform that conversion now. | |||
10292 | if (OperatorDelete->isDestroyingOperatorDelete()) { | |||
10293 | QualType ParamType = OperatorDelete->getParamDecl(0)->getType(); | |||
10294 | if (!declaresSameEntity(ParamType->getAsCXXRecordDecl(), RD)) { | |||
10295 | // C++ [class.dtor]p13: | |||
10296 | // ... as if for the expression 'delete this' appearing in a | |||
10297 | // non-virtual destructor of the destructor's class. | |||
10298 | ContextRAII SwitchContext(*this, Destructor); | |||
10299 | ExprResult This = | |||
10300 | ActOnCXXThis(OperatorDelete->getParamDecl(0)->getLocation()); | |||
10301 | assert(!This.isInvalid() && "couldn't form 'this' expr in dtor?")((!This.isInvalid() && "couldn't form 'this' expr in dtor?" ) ? static_cast<void> (0) : __assert_fail ("!This.isInvalid() && \"couldn't form 'this' expr in dtor?\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 10301, __PRETTY_FUNCTION__)); | |||
10302 | This = PerformImplicitConversion(This.get(), ParamType, AA_Passing); | |||
10303 | if (This.isInvalid()) { | |||
10304 | // FIXME: Register this as a context note so that it comes out | |||
10305 | // in the right order. | |||
10306 | Diag(Loc, diag::note_implicit_delete_this_in_destructor_here); | |||
10307 | return true; | |||
10308 | } | |||
10309 | ThisArg = This.get(); | |||
10310 | } | |||
10311 | } | |||
10312 | ||||
10313 | DiagnoseUseOfDecl(OperatorDelete, Loc); | |||
10314 | MarkFunctionReferenced(Loc, OperatorDelete); | |||
10315 | Destructor->setOperatorDelete(OperatorDelete, ThisArg); | |||
10316 | } | |||
10317 | } | |||
10318 | ||||
10319 | return false; | |||
10320 | } | |||
10321 | ||||
10322 | /// CheckDestructorDeclarator - Called by ActOnDeclarator to check | |||
10323 | /// the well-formednes of the destructor declarator @p D with type @p | |||
10324 | /// R. If there are any errors in the declarator, this routine will | |||
10325 | /// emit diagnostics and set the declarator to invalid. Even if this happens, | |||
10326 | /// will be updated to reflect a well-formed type for the destructor and | |||
10327 | /// returned. | |||
10328 | QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, | |||
10329 | StorageClass& SC) { | |||
10330 | // C++ [class.dtor]p1: | |||
10331 | // [...] A typedef-name that names a class is a class-name | |||
10332 | // (7.1.3); however, a typedef-name that names a class shall not | |||
10333 | // be used as the identifier in the declarator for a destructor | |||
10334 | // declaration. | |||
10335 | QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); | |||
10336 | if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) | |||
10337 | Diag(D.getIdentifierLoc(), diag::ext_destructor_typedef_name) | |||
10338 | << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); | |||
10339 | else if (const TemplateSpecializationType *TST = | |||
10340 | DeclaratorType->getAs<TemplateSpecializationType>()) | |||
10341 | if (TST->isTypeAlias()) | |||
10342 | Diag(D.getIdentifierLoc(), diag::ext_destructor_typedef_name) | |||
10343 | << DeclaratorType << 1; | |||
10344 | ||||
10345 | // C++ [class.dtor]p2: | |||
10346 | // A destructor is used to destroy objects of its class type. A | |||
10347 | // destructor takes no parameters, and no return type can be | |||
10348 | // specified for it (not even void). The address of a destructor | |||
10349 | // shall not be taken. A destructor shall not be static. A | |||
10350 | // destructor can be invoked for a const, volatile or const | |||
10351 | // volatile object. A destructor shall not be declared const, | |||
10352 | // volatile or const volatile (9.3.2). | |||
10353 | if (SC == SC_Static) { | |||
10354 | if (!D.isInvalidType()) | |||
10355 | Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) | |||
10356 | << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) | |||
10357 | << SourceRange(D.getIdentifierLoc()) | |||
10358 | << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); | |||
10359 | ||||
10360 | SC = SC_None; | |||
10361 | } | |||
10362 | if (!D.isInvalidType()) { | |||
10363 | // Destructors don't have return types, but the parser will | |||
10364 | // happily parse something like: | |||
10365 | // | |||
10366 | // class X { | |||
10367 | // float ~X(); | |||
10368 | // }; | |||
10369 | // | |||
10370 | // The return type will be eliminated later. | |||
10371 | if (D.getDeclSpec().hasTypeSpecifier()) | |||
10372 | Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) | |||
10373 | << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) | |||
10374 | << SourceRange(D.getIdentifierLoc()); | |||
10375 | else if (unsigned TypeQuals = D.getDeclSpec().getTypeQualifiers()) { | |||
10376 | diagnoseIgnoredQualifiers(diag::err_destructor_return_type, TypeQuals, | |||
10377 | SourceLocation(), | |||
10378 | D.getDeclSpec().getConstSpecLoc(), | |||
10379 | D.getDeclSpec().getVolatileSpecLoc(), | |||
10380 | D.getDeclSpec().getRestrictSpecLoc(), | |||
10381 | D.getDeclSpec().getAtomicSpecLoc()); | |||
10382 | D.setInvalidType(); | |||
10383 | } | |||
10384 | } | |||
10385 | ||||
10386 | checkMethodTypeQualifiers(*this, D, diag::err_invalid_qualified_destructor); | |||
10387 | ||||
10388 | // C++0x [class.dtor]p2: | |||
10389 | // A destructor shall not be declared with a ref-qualifier. | |||
10390 | DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); | |||
10391 | if (FTI.hasRefQualifier()) { | |||
10392 | Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) | |||
10393 | << FTI.RefQualifierIsLValueRef | |||
10394 | << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); | |||
10395 | D.setInvalidType(); | |||
10396 | } | |||
10397 | ||||
10398 | // Make sure we don't have any parameters. | |||
10399 | if (FTIHasNonVoidParameters(FTI)) { | |||
10400 | Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); | |||
10401 | ||||
10402 | // Delete the parameters. | |||
10403 | FTI.freeParams(); | |||
10404 | D.setInvalidType(); | |||
10405 | } | |||
10406 | ||||
10407 | // Make sure the destructor isn't variadic. | |||
10408 | if (FTI.isVariadic) { | |||
10409 | Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); | |||
10410 | D.setInvalidType(); | |||
10411 | } | |||
10412 | ||||
10413 | // Rebuild the function type "R" without any type qualifiers or | |||
10414 | // parameters (in case any of the errors above fired) and with | |||
10415 | // "void" as the return type, since destructors don't have return | |||
10416 | // types. | |||
10417 | if (!D.isInvalidType()) | |||
10418 | return R; | |||
10419 | ||||
10420 | const FunctionProtoType *Proto = R->castAs<FunctionProtoType>(); | |||
10421 | FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); | |||
10422 | EPI.Variadic = false; | |||
10423 | EPI.TypeQuals = Qualifiers(); | |||
10424 | EPI.RefQualifier = RQ_None; | |||
10425 | return Context.getFunctionType(Context.VoidTy, None, EPI); | |||
10426 | } | |||
10427 | ||||
10428 | static void extendLeft(SourceRange &R, SourceRange Before) { | |||
10429 | if (Before.isInvalid()) | |||
10430 | return; | |||
10431 | R.setBegin(Before.getBegin()); | |||
10432 | if (R.getEnd().isInvalid()) | |||
10433 | R.setEnd(Before.getEnd()); | |||
10434 | } | |||
10435 | ||||
10436 | static void extendRight(SourceRange &R, SourceRange After) { | |||
10437 | if (After.isInvalid()) | |||
10438 | return; | |||
10439 | if (R.getBegin().isInvalid()) | |||
10440 | R.setBegin(After.getBegin()); | |||
10441 | R.setEnd(After.getEnd()); | |||
10442 | } | |||
10443 | ||||
10444 | /// CheckConversionDeclarator - Called by ActOnDeclarator to check the | |||
10445 | /// well-formednes of the conversion function declarator @p D with | |||
10446 | /// type @p R. If there are any errors in the declarator, this routine | |||
10447 | /// will emit diagnostics and return true. Otherwise, it will return | |||
10448 | /// false. Either way, the type @p R will be updated to reflect a | |||
10449 | /// well-formed type for the conversion operator. | |||
10450 | void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, | |||
10451 | StorageClass& SC) { | |||
10452 | // C++ [class.conv.fct]p1: | |||
10453 | // Neither parameter types nor return type can be specified. The | |||
10454 | // type of a conversion function (8.3.5) is "function taking no | |||
10455 | // parameter returning conversion-type-id." | |||
10456 | if (SC == SC_Static) { | |||
10457 | if (!D.isInvalidType()) | |||
10458 | Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) | |||
10459 | << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) | |||
10460 | << D.getName().getSourceRange(); | |||
10461 | D.setInvalidType(); | |||
10462 | SC = SC_None; | |||
10463 | } | |||
10464 | ||||
10465 | TypeSourceInfo *ConvTSI = nullptr; | |||
10466 | QualType ConvType = | |||
10467 | GetTypeFromParser(D.getName().ConversionFunctionId, &ConvTSI); | |||
10468 | ||||
10469 | const DeclSpec &DS = D.getDeclSpec(); | |||
10470 | if (DS.hasTypeSpecifier() && !D.isInvalidType()) { | |||
10471 | // Conversion functions don't have return types, but the parser will | |||
10472 | // happily parse something like: | |||
10473 | // | |||
10474 | // class X { | |||
10475 | // float operator bool(); | |||
10476 | // }; | |||
10477 | // | |||
10478 | // The return type will be changed later anyway. | |||
10479 | Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) | |||
10480 | << SourceRange(DS.getTypeSpecTypeLoc()) | |||
10481 | << SourceRange(D.getIdentifierLoc()); | |||
10482 | D.setInvalidType(); | |||
10483 | } else if (DS.getTypeQualifiers() && !D.isInvalidType()) { | |||
10484 | // It's also plausible that the user writes type qualifiers in the wrong | |||
10485 | // place, such as: | |||
10486 | // struct S { const operator int(); }; | |||
10487 | // FIXME: we could provide a fixit to move the qualifiers onto the | |||
10488 | // conversion type. | |||
10489 | Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) | |||
10490 | << SourceRange(D.getIdentifierLoc()) << 0; | |||
10491 | D.setInvalidType(); | |||
10492 | } | |||
10493 | ||||
10494 | const auto *Proto = R->castAs<FunctionProtoType>(); | |||
10495 | ||||
10496 | // Make sure we don't have any parameters. | |||
10497 | if (Proto->getNumParams() > 0) { | |||
10498 | Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); | |||
10499 | ||||
10500 | // Delete the parameters. | |||
10501 | D.getFunctionTypeInfo().freeParams(); | |||
10502 | D.setInvalidType(); | |||
10503 | } else if (Proto->isVariadic()) { | |||
10504 | Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); | |||
10505 | D.setInvalidType(); | |||
10506 | } | |||
10507 | ||||
10508 | // Diagnose "&operator bool()" and other such nonsense. This | |||
10509 | // is actually a gcc extension which we don't support. | |||
10510 | if (Proto->getReturnType() != ConvType) { | |||
10511 | bool NeedsTypedef = false; | |||
10512 | SourceRange Before, After; | |||
10513 | ||||
10514 | // Walk the chunks and extract information on them for our diagnostic. | |||
10515 | bool PastFunctionChunk = false; | |||
10516 | for (auto &Chunk : D.type_objects()) { | |||
10517 | switch (Chunk.Kind) { | |||
10518 | case DeclaratorChunk::Function: | |||
10519 | if (!PastFunctionChunk) { | |||
10520 | if (Chunk.Fun.HasTrailingReturnType) { | |||
10521 | TypeSourceInfo *TRT = nullptr; | |||
10522 | GetTypeFromParser(Chunk.Fun.getTrailingReturnType(), &TRT); | |||
10523 | if (TRT) extendRight(After, TRT->getTypeLoc().getSourceRange()); | |||
10524 | } | |||
10525 | PastFunctionChunk = true; | |||
10526 | break; | |||
10527 | } | |||
10528 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
10529 | case DeclaratorChunk::Array: | |||
10530 | NeedsTypedef = true; | |||
10531 | extendRight(After, Chunk.getSourceRange()); | |||
10532 | break; | |||
10533 | ||||
10534 | case DeclaratorChunk::Pointer: | |||
10535 | case DeclaratorChunk::BlockPointer: | |||
10536 | case DeclaratorChunk::Reference: | |||
10537 | case DeclaratorChunk::MemberPointer: | |||
10538 | case DeclaratorChunk::Pipe: | |||
10539 | extendLeft(Before, Chunk.getSourceRange()); | |||
10540 | break; | |||
10541 | ||||
10542 | case DeclaratorChunk::Paren: | |||
10543 | extendLeft(Before, Chunk.Loc); | |||
10544 | extendRight(After, Chunk.EndLoc); | |||
10545 | break; | |||
10546 | } | |||
10547 | } | |||
10548 | ||||
10549 | SourceLocation Loc = Before.isValid() ? Before.getBegin() : | |||
10550 | After.isValid() ? After.getBegin() : | |||
10551 | D.getIdentifierLoc(); | |||
10552 | auto &&DB = Diag(Loc, diag::err_conv_function_with_complex_decl); | |||
10553 | DB << Before << After; | |||
10554 | ||||
10555 | if (!NeedsTypedef) { | |||
10556 | DB << /*don't need a typedef*/0; | |||
10557 | ||||
10558 | // If we can provide a correct fix-it hint, do so. | |||
10559 | if (After.isInvalid() && ConvTSI) { | |||
10560 | SourceLocation InsertLoc = | |||
10561 | getLocForEndOfToken(ConvTSI->getTypeLoc().getEndLoc()); | |||
10562 | DB << FixItHint::CreateInsertion(InsertLoc, " ") | |||
10563 | << FixItHint::CreateInsertionFromRange( | |||
10564 | InsertLoc, CharSourceRange::getTokenRange(Before)) | |||
10565 | << FixItHint::CreateRemoval(Before); | |||
10566 | } | |||
10567 | } else if (!Proto->getReturnType()->isDependentType()) { | |||
10568 | DB << /*typedef*/1 << Proto->getReturnType(); | |||
10569 | } else if (getLangOpts().CPlusPlus11) { | |||
10570 | DB << /*alias template*/2 << Proto->getReturnType(); | |||
10571 | } else { | |||
10572 | DB << /*might not be fixable*/3; | |||
10573 | } | |||
10574 | ||||
10575 | // Recover by incorporating the other type chunks into the result type. | |||
10576 | // Note, this does *not* change the name of the function. This is compatible | |||
10577 | // with the GCC extension: | |||
10578 | // struct S { &operator int(); } s; | |||
10579 | // int &r = s.operator int(); // ok in GCC | |||
10580 | // S::operator int&() {} // error in GCC, function name is 'operator int'. | |||
10581 | ConvType = Proto->getReturnType(); | |||
10582 | } | |||
10583 | ||||
10584 | // C++ [class.conv.fct]p4: | |||
10585 | // The conversion-type-id shall not represent a function type nor | |||
10586 | // an array type. | |||
10587 | if (ConvType->isArrayType()) { | |||
10588 | Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); | |||
10589 | ConvType = Context.getPointerType(ConvType); | |||
10590 | D.setInvalidType(); | |||
10591 | } else if (ConvType->isFunctionType()) { | |||
10592 | Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); | |||
10593 | ConvType = Context.getPointerType(ConvType); | |||
10594 | D.setInvalidType(); | |||
10595 | } | |||
10596 | ||||
10597 | // Rebuild the function type "R" without any parameters (in case any | |||
10598 | // of the errors above fired) and with the conversion type as the | |||
10599 | // return type. | |||
10600 | if (D.isInvalidType()) | |||
10601 | R = Context.getFunctionType(ConvType, None, Proto->getExtProtoInfo()); | |||
10602 | ||||
10603 | // C++0x explicit conversion operators. | |||
10604 | if (DS.hasExplicitSpecifier() && !getLangOpts().CPlusPlus20) | |||
10605 | Diag(DS.getExplicitSpecLoc(), | |||
10606 | getLangOpts().CPlusPlus11 | |||
10607 | ? diag::warn_cxx98_compat_explicit_conversion_functions | |||
10608 | : diag::ext_explicit_conversion_functions) | |||
10609 | << SourceRange(DS.getExplicitSpecRange()); | |||
10610 | } | |||
10611 | ||||
10612 | /// ActOnConversionDeclarator - Called by ActOnDeclarator to complete | |||
10613 | /// the declaration of the given C++ conversion function. This routine | |||
10614 | /// is responsible for recording the conversion function in the C++ | |||
10615 | /// class, if possible. | |||
10616 | Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { | |||
10617 | assert(Conversion && "Expected to receive a conversion function declaration")((Conversion && "Expected to receive a conversion function declaration" ) ? static_cast<void> (0) : __assert_fail ("Conversion && \"Expected to receive a conversion function declaration\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 10617, __PRETTY_FUNCTION__)); | |||
10618 | ||||
10619 | CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); | |||
10620 | ||||
10621 | // Make sure we aren't redeclaring the conversion function. | |||
10622 | QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); | |||
10623 | // C++ [class.conv.fct]p1: | |||
10624 | // [...] A conversion function is never used to convert a | |||
10625 | // (possibly cv-qualified) object to the (possibly cv-qualified) | |||
10626 | // same object type (or a reference to it), to a (possibly | |||
10627 | // cv-qualified) base class of that type (or a reference to it), | |||
10628 | // or to (possibly cv-qualified) void. | |||
10629 | QualType ClassType | |||
10630 | = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); | |||
10631 | if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) | |||
10632 | ConvType = ConvTypeRef->getPointeeType(); | |||
10633 | if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && | |||
10634 | Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) | |||
10635 | /* Suppress diagnostics for instantiations. */; | |||
10636 | else if (Conversion->size_overridden_methods() != 0) | |||
10637 | /* Suppress diagnostics for overriding virtual function in a base class. */; | |||
10638 | else if (ConvType->isRecordType()) { | |||
10639 | ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); | |||
10640 | if (ConvType == ClassType) | |||
10641 | Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) | |||
10642 | << ClassType; | |||
10643 | else if (IsDerivedFrom(Conversion->getLocation(), ClassType, ConvType)) | |||
10644 | Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) | |||
10645 | << ClassType << ConvType; | |||
10646 | } else if (ConvType->isVoidType()) { | |||
10647 | Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) | |||
10648 | << ClassType << ConvType; | |||
10649 | } | |||
10650 | ||||
10651 | if (FunctionTemplateDecl *ConversionTemplate | |||
10652 | = Conversion->getDescribedFunctionTemplate()) | |||
10653 | return ConversionTemplate; | |||
10654 | ||||
10655 | return Conversion; | |||
10656 | } | |||
10657 | ||||
10658 | namespace { | |||
10659 | /// Utility class to accumulate and print a diagnostic listing the invalid | |||
10660 | /// specifier(s) on a declaration. | |||
10661 | struct BadSpecifierDiagnoser { | |||
10662 | BadSpecifierDiagnoser(Sema &S, SourceLocation Loc, unsigned DiagID) | |||
10663 | : S(S), Diagnostic(S.Diag(Loc, DiagID)) {} | |||
10664 | ~BadSpecifierDiagnoser() { | |||
10665 | Diagnostic << Specifiers; | |||
10666 | } | |||
10667 | ||||
10668 | template<typename T> void check(SourceLocation SpecLoc, T Spec) { | |||
10669 | return check(SpecLoc, DeclSpec::getSpecifierName(Spec)); | |||
10670 | } | |||
10671 | void check(SourceLocation SpecLoc, DeclSpec::TST Spec) { | |||
10672 | return check(SpecLoc, | |||
10673 | DeclSpec::getSpecifierName(Spec, S.getPrintingPolicy())); | |||
10674 | } | |||
10675 | void check(SourceLocation SpecLoc, const char *Spec) { | |||
10676 | if (SpecLoc.isInvalid()) return; | |||
10677 | Diagnostic << SourceRange(SpecLoc, SpecLoc); | |||
10678 | if (!Specifiers.empty()) Specifiers += " "; | |||
10679 | Specifiers += Spec; | |||
10680 | } | |||
10681 | ||||
10682 | Sema &S; | |||
10683 | Sema::SemaDiagnosticBuilder Diagnostic; | |||
10684 | std::string Specifiers; | |||
10685 | }; | |||
10686 | } | |||
10687 | ||||
10688 | /// Check the validity of a declarator that we parsed for a deduction-guide. | |||
10689 | /// These aren't actually declarators in the grammar, so we need to check that | |||
10690 | /// the user didn't specify any pieces that are not part of the deduction-guide | |||
10691 | /// grammar. | |||
10692 | void Sema::CheckDeductionGuideDeclarator(Declarator &D, QualType &R, | |||
10693 | StorageClass &SC) { | |||
10694 | TemplateName GuidedTemplate = D.getName().TemplateName.get().get(); | |||
10695 | TemplateDecl *GuidedTemplateDecl = GuidedTemplate.getAsTemplateDecl(); | |||
10696 | assert(GuidedTemplateDecl && "missing template decl for deduction guide")((GuidedTemplateDecl && "missing template decl for deduction guide" ) ? static_cast<void> (0) : __assert_fail ("GuidedTemplateDecl && \"missing template decl for deduction guide\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 10696, __PRETTY_FUNCTION__)); | |||
10697 | ||||
10698 | // C++ [temp.deduct.guide]p3: | |||
10699 | // A deduction-gide shall be declared in the same scope as the | |||
10700 | // corresponding class template. | |||
10701 | if (!CurContext->getRedeclContext()->Equals( | |||
10702 | GuidedTemplateDecl->getDeclContext()->getRedeclContext())) { | |||
10703 | Diag(D.getIdentifierLoc(), diag::err_deduction_guide_wrong_scope) | |||
10704 | << GuidedTemplateDecl; | |||
10705 | Diag(GuidedTemplateDecl->getLocation(), diag::note_template_decl_here); | |||
10706 | } | |||
10707 | ||||
10708 | auto &DS = D.getMutableDeclSpec(); | |||
10709 | // We leave 'friend' and 'virtual' to be rejected in the normal way. | |||
10710 | if (DS.hasTypeSpecifier() || DS.getTypeQualifiers() || | |||
10711 | DS.getStorageClassSpecLoc().isValid() || DS.isInlineSpecified() || | |||
10712 | DS.isNoreturnSpecified() || DS.hasConstexprSpecifier()) { | |||
10713 | BadSpecifierDiagnoser Diagnoser( | |||
10714 | *this, D.getIdentifierLoc(), | |||
10715 | diag::err_deduction_guide_invalid_specifier); | |||
10716 | ||||
10717 | Diagnoser.check(DS.getStorageClassSpecLoc(), DS.getStorageClassSpec()); | |||
10718 | DS.ClearStorageClassSpecs(); | |||
10719 | SC = SC_None; | |||
10720 | ||||
10721 | // 'explicit' is permitted. | |||
10722 | Diagnoser.check(DS.getInlineSpecLoc(), "inline"); | |||
10723 | Diagnoser.check(DS.getNoreturnSpecLoc(), "_Noreturn"); | |||
10724 | Diagnoser.check(DS.getConstexprSpecLoc(), "constexpr"); | |||
10725 | DS.ClearConstexprSpec(); | |||
10726 | ||||
10727 | Diagnoser.check(DS.getConstSpecLoc(), "const"); | |||
10728 | Diagnoser.check(DS.getRestrictSpecLoc(), "__restrict"); | |||
10729 | Diagnoser.check(DS.getVolatileSpecLoc(), "volatile"); | |||
10730 | Diagnoser.check(DS.getAtomicSpecLoc(), "_Atomic"); | |||
10731 | Diagnoser.check(DS.getUnalignedSpecLoc(), "__unaligned"); | |||
10732 | DS.ClearTypeQualifiers(); | |||
10733 | ||||
10734 | Diagnoser.check(DS.getTypeSpecComplexLoc(), DS.getTypeSpecComplex()); | |||
10735 | Diagnoser.check(DS.getTypeSpecSignLoc(), DS.getTypeSpecSign()); | |||
10736 | Diagnoser.check(DS.getTypeSpecWidthLoc(), DS.getTypeSpecWidth()); | |||
10737 | Diagnoser.check(DS.getTypeSpecTypeLoc(), DS.getTypeSpecType()); | |||
10738 | DS.ClearTypeSpecType(); | |||
10739 | } | |||
10740 | ||||
10741 | if (D.isInvalidType()) | |||
10742 | return; | |||
10743 | ||||
10744 | // Check the declarator is simple enough. | |||
10745 | bool FoundFunction = false; | |||
10746 | for (const DeclaratorChunk &Chunk : llvm::reverse(D.type_objects())) { | |||
10747 | if (Chunk.Kind == DeclaratorChunk::Paren) | |||
10748 | continue; | |||
10749 | if (Chunk.Kind != DeclaratorChunk::Function || FoundFunction) { | |||
10750 | Diag(D.getDeclSpec().getBeginLoc(), | |||
10751 | diag::err_deduction_guide_with_complex_decl) | |||
10752 | << D.getSourceRange(); | |||
10753 | break; | |||
10754 | } | |||
10755 | if (!Chunk.Fun.hasTrailingReturnType()) { | |||
10756 | Diag(D.getName().getBeginLoc(), | |||
10757 | diag::err_deduction_guide_no_trailing_return_type); | |||
10758 | break; | |||
10759 | } | |||
10760 | ||||
10761 | // Check that the return type is written as a specialization of | |||
10762 | // the template specified as the deduction-guide's name. | |||
10763 | ParsedType TrailingReturnType = Chunk.Fun.getTrailingReturnType(); | |||
10764 | TypeSourceInfo *TSI = nullptr; | |||
10765 | QualType RetTy = GetTypeFromParser(TrailingReturnType, &TSI); | |||
10766 | assert(TSI && "deduction guide has valid type but invalid return type?")((TSI && "deduction guide has valid type but invalid return type?" ) ? static_cast<void> (0) : __assert_fail ("TSI && \"deduction guide has valid type but invalid return type?\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 10766, __PRETTY_FUNCTION__)); | |||
10767 | bool AcceptableReturnType = false; | |||
10768 | bool MightInstantiateToSpecialization = false; | |||
10769 | if (auto RetTST = | |||
10770 | TSI->getTypeLoc().getAs<TemplateSpecializationTypeLoc>()) { | |||
10771 | TemplateName SpecifiedName = RetTST.getTypePtr()->getTemplateName(); | |||
10772 | bool TemplateMatches = | |||
10773 | Context.hasSameTemplateName(SpecifiedName, GuidedTemplate); | |||
10774 | if (SpecifiedName.getKind() == TemplateName::Template && TemplateMatches) | |||
10775 | AcceptableReturnType = true; | |||
10776 | else { | |||
10777 | // This could still instantiate to the right type, unless we know it | |||
10778 | // names the wrong class template. | |||
10779 | auto *TD = SpecifiedName.getAsTemplateDecl(); | |||
10780 | MightInstantiateToSpecialization = !(TD && isa<ClassTemplateDecl>(TD) && | |||
10781 | !TemplateMatches); | |||
10782 | } | |||
10783 | } else if (!RetTy.hasQualifiers() && RetTy->isDependentType()) { | |||
10784 | MightInstantiateToSpecialization = true; | |||
10785 | } | |||
10786 | ||||
10787 | if (!AcceptableReturnType) { | |||
10788 | Diag(TSI->getTypeLoc().getBeginLoc(), | |||
10789 | diag::err_deduction_guide_bad_trailing_return_type) | |||
10790 | << GuidedTemplate << TSI->getType() | |||
10791 | << MightInstantiateToSpecialization | |||
10792 | << TSI->getTypeLoc().getSourceRange(); | |||
10793 | } | |||
10794 | ||||
10795 | // Keep going to check that we don't have any inner declarator pieces (we | |||
10796 | // could still have a function returning a pointer to a function). | |||
10797 | FoundFunction = true; | |||
10798 | } | |||
10799 | ||||
10800 | if (D.isFunctionDefinition()) | |||
10801 | Diag(D.getIdentifierLoc(), diag::err_deduction_guide_defines_function); | |||
10802 | } | |||
10803 | ||||
10804 | //===----------------------------------------------------------------------===// | |||
10805 | // Namespace Handling | |||
10806 | //===----------------------------------------------------------------------===// | |||
10807 | ||||
10808 | /// Diagnose a mismatch in 'inline' qualifiers when a namespace is | |||
10809 | /// reopened. | |||
10810 | static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, | |||
10811 | SourceLocation Loc, | |||
10812 | IdentifierInfo *II, bool *IsInline, | |||
10813 | NamespaceDecl *PrevNS) { | |||
10814 | assert(*IsInline != PrevNS->isInline())((*IsInline != PrevNS->isInline()) ? static_cast<void> (0) : __assert_fail ("*IsInline != PrevNS->isInline()", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 10814, __PRETTY_FUNCTION__)); | |||
10815 | ||||
10816 | // HACK: Work around a bug in libstdc++4.6's <atomic>, where | |||
10817 | // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as | |||
10818 | // inline namespaces, with the intention of bringing names into namespace std. | |||
10819 | // | |||
10820 | // We support this just well enough to get that case working; this is not | |||
10821 | // sufficient to support reopening namespaces as inline in general. | |||
10822 | if (*IsInline && II && II->getName().startswith("__atomic") && | |||
10823 | S.getSourceManager().isInSystemHeader(Loc)) { | |||
10824 | // Mark all prior declarations of the namespace as inline. | |||
10825 | for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; | |||
10826 | NS = NS->getPreviousDecl()) | |||
10827 | NS->setInline(*IsInline); | |||
10828 | // Patch up the lookup table for the containing namespace. This isn't really | |||
10829 | // correct, but it's good enough for this particular case. | |||
10830 | for (auto *I : PrevNS->decls()) | |||
10831 | if (auto *ND = dyn_cast<NamedDecl>(I)) | |||
10832 | PrevNS->getParent()->makeDeclVisibleInContext(ND); | |||
10833 | return; | |||
10834 | } | |||
10835 | ||||
10836 | if (PrevNS->isInline()) | |||
10837 | // The user probably just forgot the 'inline', so suggest that it | |||
10838 | // be added back. | |||
10839 | S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) | |||
10840 | << FixItHint::CreateInsertion(KeywordLoc, "inline "); | |||
10841 | else | |||
10842 | S.Diag(Loc, diag::err_inline_namespace_mismatch); | |||
10843 | ||||
10844 | S.Diag(PrevNS->getLocation(), diag::note_previous_definition); | |||
10845 | *IsInline = PrevNS->isInline(); | |||
10846 | } | |||
10847 | ||||
10848 | /// ActOnStartNamespaceDef - This is called at the start of a namespace | |||
10849 | /// definition. | |||
10850 | Decl *Sema::ActOnStartNamespaceDef( | |||
10851 | Scope *NamespcScope, SourceLocation InlineLoc, SourceLocation NamespaceLoc, | |||
10852 | SourceLocation IdentLoc, IdentifierInfo *II, SourceLocation LBrace, | |||
10853 | const ParsedAttributesView &AttrList, UsingDirectiveDecl *&UD) { | |||
10854 | SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; | |||
10855 | // For anonymous namespace, take the location of the left brace. | |||
10856 | SourceLocation Loc = II ? IdentLoc : LBrace; | |||
10857 | bool IsInline = InlineLoc.isValid(); | |||
10858 | bool IsInvalid = false; | |||
10859 | bool IsStd = false; | |||
10860 | bool AddToKnown = false; | |||
10861 | Scope *DeclRegionScope = NamespcScope->getParent(); | |||
10862 | ||||
10863 | NamespaceDecl *PrevNS = nullptr; | |||
10864 | if (II) { | |||
10865 | // C++ [namespace.def]p2: | |||
10866 | // The identifier in an original-namespace-definition shall not | |||
10867 | // have been previously defined in the declarative region in | |||
10868 | // which the original-namespace-definition appears. The | |||
10869 | // identifier in an original-namespace-definition is the name of | |||
10870 | // the namespace. Subsequently in that declarative region, it is | |||
10871 | // treated as an original-namespace-name. | |||
10872 | // | |||
10873 | // Since namespace names are unique in their scope, and we don't | |||
10874 | // look through using directives, just look for any ordinary names | |||
10875 | // as if by qualified name lookup. | |||
10876 | LookupResult R(*this, II, IdentLoc, LookupOrdinaryName, | |||
10877 | ForExternalRedeclaration); | |||
10878 | LookupQualifiedName(R, CurContext->getRedeclContext()); | |||
10879 | NamedDecl *PrevDecl = | |||
10880 | R.isSingleResult() ? R.getRepresentativeDecl() : nullptr; | |||
10881 | PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); | |||
10882 | ||||
10883 | if (PrevNS) { | |||
10884 | // This is an extended namespace definition. | |||
10885 | if (IsInline != PrevNS->isInline()) | |||
10886 | DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, | |||
10887 | &IsInline, PrevNS); | |||
10888 | } else if (PrevDecl) { | |||
10889 | // This is an invalid name redefinition. | |||
10890 | Diag(Loc, diag::err_redefinition_different_kind) | |||
10891 | << II; | |||
10892 | Diag(PrevDecl->getLocation(), diag::note_previous_definition); | |||
10893 | IsInvalid = true; | |||
10894 | // Continue on to push Namespc as current DeclContext and return it. | |||
10895 | } else if (II->isStr("std") && | |||
10896 | CurContext->getRedeclContext()->isTranslationUnit()) { | |||
10897 | // This is the first "real" definition of the namespace "std", so update | |||
10898 | // our cache of the "std" namespace to point at this definition. | |||
10899 | PrevNS = getStdNamespace(); | |||
10900 | IsStd = true; | |||
10901 | AddToKnown = !IsInline; | |||
10902 | } else { | |||
10903 | // We've seen this namespace for the first time. | |||
10904 | AddToKnown = !IsInline; | |||
10905 | } | |||
10906 | } else { | |||
10907 | // Anonymous namespaces. | |||
10908 | ||||
10909 | // Determine whether the parent already has an anonymous namespace. | |||
10910 | DeclContext *Parent = CurContext->getRedeclContext(); | |||
10911 | if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { | |||
10912 | PrevNS = TU->getAnonymousNamespace(); | |||
10913 | } else { | |||
10914 | NamespaceDecl *ND = cast<NamespaceDecl>(Parent); | |||
10915 | PrevNS = ND->getAnonymousNamespace(); | |||
10916 | } | |||
10917 | ||||
10918 | if (PrevNS && IsInline != PrevNS->isInline()) | |||
10919 | DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, | |||
10920 | &IsInline, PrevNS); | |||
10921 | } | |||
10922 | ||||
10923 | NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, | |||
10924 | StartLoc, Loc, II, PrevNS); | |||
10925 | if (IsInvalid) | |||
10926 | Namespc->setInvalidDecl(); | |||
10927 | ||||
10928 | ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); | |||
10929 | AddPragmaAttributes(DeclRegionScope, Namespc); | |||
10930 | ||||
10931 | // FIXME: Should we be merging attributes? | |||
10932 | if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) | |||
10933 | PushNamespaceVisibilityAttr(Attr, Loc); | |||
10934 | ||||
10935 | if (IsStd) | |||
10936 | StdNamespace = Namespc; | |||
10937 | if (AddToKnown) | |||
10938 | KnownNamespaces[Namespc] = false; | |||
10939 | ||||
10940 | if (II) { | |||
10941 | PushOnScopeChains(Namespc, DeclRegionScope); | |||
10942 | } else { | |||
10943 | // Link the anonymous namespace into its parent. | |||
10944 | DeclContext *Parent = CurContext->getRedeclContext(); | |||
10945 | if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { | |||
10946 | TU->setAnonymousNamespace(Namespc); | |||
10947 | } else { | |||
10948 | cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); | |||
10949 | } | |||
10950 | ||||
10951 | CurContext->addDecl(Namespc); | |||
10952 | ||||
10953 | // C++ [namespace.unnamed]p1. An unnamed-namespace-definition | |||
10954 | // behaves as if it were replaced by | |||
10955 | // namespace unique { /* empty body */ } | |||
10956 | // using namespace unique; | |||
10957 | // namespace unique { namespace-body } | |||
10958 | // where all occurrences of 'unique' in a translation unit are | |||
10959 | // replaced by the same identifier and this identifier differs | |||
10960 | // from all other identifiers in the entire program. | |||
10961 | ||||
10962 | // We just create the namespace with an empty name and then add an | |||
10963 | // implicit using declaration, just like the standard suggests. | |||
10964 | // | |||
10965 | // CodeGen enforces the "universally unique" aspect by giving all | |||
10966 | // declarations semantically contained within an anonymous | |||
10967 | // namespace internal linkage. | |||
10968 | ||||
10969 | if (!PrevNS) { | |||
10970 | UD = UsingDirectiveDecl::Create(Context, Parent, | |||
10971 | /* 'using' */ LBrace, | |||
10972 | /* 'namespace' */ SourceLocation(), | |||
10973 | /* qualifier */ NestedNameSpecifierLoc(), | |||
10974 | /* identifier */ SourceLocation(), | |||
10975 | Namespc, | |||
10976 | /* Ancestor */ Parent); | |||
10977 | UD->setImplicit(); | |||
10978 | Parent->addDecl(UD); | |||
10979 | } | |||
10980 | } | |||
10981 | ||||
10982 | ActOnDocumentableDecl(Namespc); | |||
10983 | ||||
10984 | // Although we could have an invalid decl (i.e. the namespace name is a | |||
10985 | // redefinition), push it as current DeclContext and try to continue parsing. | |||
10986 | // FIXME: We should be able to push Namespc here, so that the each DeclContext | |||
10987 | // for the namespace has the declarations that showed up in that particular | |||
10988 | // namespace definition. | |||
10989 | PushDeclContext(NamespcScope, Namespc); | |||
10990 | return Namespc; | |||
10991 | } | |||
10992 | ||||
10993 | /// getNamespaceDecl - Returns the namespace a decl represents. If the decl | |||
10994 | /// is a namespace alias, returns the namespace it points to. | |||
10995 | static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { | |||
10996 | if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) | |||
10997 | return AD->getNamespace(); | |||
10998 | return dyn_cast_or_null<NamespaceDecl>(D); | |||
10999 | } | |||
11000 | ||||
11001 | /// ActOnFinishNamespaceDef - This callback is called after a namespace is | |||
11002 | /// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. | |||
11003 | void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { | |||
11004 | NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); | |||
11005 | assert(Namespc && "Invalid parameter, expected NamespaceDecl")((Namespc && "Invalid parameter, expected NamespaceDecl" ) ? static_cast<void> (0) : __assert_fail ("Namespc && \"Invalid parameter, expected NamespaceDecl\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11005, __PRETTY_FUNCTION__)); | |||
11006 | Namespc->setRBraceLoc(RBrace); | |||
11007 | PopDeclContext(); | |||
11008 | if (Namespc->hasAttr<VisibilityAttr>()) | |||
11009 | PopPragmaVisibility(true, RBrace); | |||
11010 | // If this namespace contains an export-declaration, export it now. | |||
11011 | if (DeferredExportedNamespaces.erase(Namespc)) | |||
11012 | Dcl->setModuleOwnershipKind(Decl::ModuleOwnershipKind::VisibleWhenImported); | |||
11013 | } | |||
11014 | ||||
11015 | CXXRecordDecl *Sema::getStdBadAlloc() const { | |||
11016 | return cast_or_null<CXXRecordDecl>( | |||
11017 | StdBadAlloc.get(Context.getExternalSource())); | |||
11018 | } | |||
11019 | ||||
11020 | EnumDecl *Sema::getStdAlignValT() const { | |||
11021 | return cast_or_null<EnumDecl>(StdAlignValT.get(Context.getExternalSource())); | |||
11022 | } | |||
11023 | ||||
11024 | NamespaceDecl *Sema::getStdNamespace() const { | |||
11025 | return cast_or_null<NamespaceDecl>( | |||
11026 | StdNamespace.get(Context.getExternalSource())); | |||
11027 | } | |||
11028 | ||||
11029 | NamespaceDecl *Sema::lookupStdExperimentalNamespace() { | |||
11030 | if (!StdExperimentalNamespaceCache) { | |||
11031 | if (auto Std = getStdNamespace()) { | |||
11032 | LookupResult Result(*this, &PP.getIdentifierTable().get("experimental"), | |||
11033 | SourceLocation(), LookupNamespaceName); | |||
11034 | if (!LookupQualifiedName(Result, Std) || | |||
11035 | !(StdExperimentalNamespaceCache = | |||
11036 | Result.getAsSingle<NamespaceDecl>())) | |||
11037 | Result.suppressDiagnostics(); | |||
11038 | } | |||
11039 | } | |||
11040 | return StdExperimentalNamespaceCache; | |||
11041 | } | |||
11042 | ||||
11043 | namespace { | |||
11044 | ||||
11045 | enum UnsupportedSTLSelect { | |||
11046 | USS_InvalidMember, | |||
11047 | USS_MissingMember, | |||
11048 | USS_NonTrivial, | |||
11049 | USS_Other | |||
11050 | }; | |||
11051 | ||||
11052 | struct InvalidSTLDiagnoser { | |||
11053 | Sema &S; | |||
11054 | SourceLocation Loc; | |||
11055 | QualType TyForDiags; | |||
11056 | ||||
11057 | QualType operator()(UnsupportedSTLSelect Sel = USS_Other, StringRef Name = "", | |||
11058 | const VarDecl *VD = nullptr) { | |||
11059 | { | |||
11060 | auto D = S.Diag(Loc, diag::err_std_compare_type_not_supported) | |||
11061 | << TyForDiags << ((int)Sel); | |||
11062 | if (Sel == USS_InvalidMember || Sel == USS_MissingMember) { | |||
11063 | assert(!Name.empty())((!Name.empty()) ? static_cast<void> (0) : __assert_fail ("!Name.empty()", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11063, __PRETTY_FUNCTION__)); | |||
11064 | D << Name; | |||
11065 | } | |||
11066 | } | |||
11067 | if (Sel == USS_InvalidMember) { | |||
11068 | S.Diag(VD->getLocation(), diag::note_var_declared_here) | |||
11069 | << VD << VD->getSourceRange(); | |||
11070 | } | |||
11071 | return QualType(); | |||
11072 | } | |||
11073 | }; | |||
11074 | } // namespace | |||
11075 | ||||
11076 | QualType Sema::CheckComparisonCategoryType(ComparisonCategoryType Kind, | |||
11077 | SourceLocation Loc, | |||
11078 | ComparisonCategoryUsage Usage) { | |||
11079 | assert(getLangOpts().CPlusPlus &&((getLangOpts().CPlusPlus && "Looking for comparison category type outside of C++." ) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"Looking for comparison category type outside of C++.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11080, __PRETTY_FUNCTION__)) | |||
11080 | "Looking for comparison category type outside of C++.")((getLangOpts().CPlusPlus && "Looking for comparison category type outside of C++." ) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"Looking for comparison category type outside of C++.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11080, __PRETTY_FUNCTION__)); | |||
11081 | ||||
11082 | // Use an elaborated type for diagnostics which has a name containing the | |||
11083 | // prepended 'std' namespace but not any inline namespace names. | |||
11084 | auto TyForDiags = [&](ComparisonCategoryInfo *Info) { | |||
11085 | auto *NNS = | |||
11086 | NestedNameSpecifier::Create(Context, nullptr, getStdNamespace()); | |||
11087 | return Context.getElaboratedType(ETK_None, NNS, Info->getType()); | |||
11088 | }; | |||
11089 | ||||
11090 | // Check if we've already successfully checked the comparison category type | |||
11091 | // before. If so, skip checking it again. | |||
11092 | ComparisonCategoryInfo *Info = Context.CompCategories.lookupInfo(Kind); | |||
11093 | if (Info && FullyCheckedComparisonCategories[static_cast<unsigned>(Kind)]) { | |||
11094 | // The only thing we need to check is that the type has a reachable | |||
11095 | // definition in the current context. | |||
11096 | if (RequireCompleteType(Loc, TyForDiags(Info), diag::err_incomplete_type)) | |||
11097 | return QualType(); | |||
11098 | ||||
11099 | return Info->getType(); | |||
11100 | } | |||
11101 | ||||
11102 | // If lookup failed | |||
11103 | if (!Info) { | |||
11104 | std::string NameForDiags = "std::"; | |||
11105 | NameForDiags += ComparisonCategories::getCategoryString(Kind); | |||
11106 | Diag(Loc, diag::err_implied_comparison_category_type_not_found) | |||
11107 | << NameForDiags << (int)Usage; | |||
11108 | return QualType(); | |||
11109 | } | |||
11110 | ||||
11111 | assert(Info->Kind == Kind)((Info->Kind == Kind) ? static_cast<void> (0) : __assert_fail ("Info->Kind == Kind", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11111, __PRETTY_FUNCTION__)); | |||
11112 | assert(Info->Record)((Info->Record) ? static_cast<void> (0) : __assert_fail ("Info->Record", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11112, __PRETTY_FUNCTION__)); | |||
11113 | ||||
11114 | // Update the Record decl in case we encountered a forward declaration on our | |||
11115 | // first pass. FIXME: This is a bit of a hack. | |||
11116 | if (Info->Record->hasDefinition()) | |||
11117 | Info->Record = Info->Record->getDefinition(); | |||
11118 | ||||
11119 | if (RequireCompleteType(Loc, TyForDiags(Info), diag::err_incomplete_type)) | |||
11120 | return QualType(); | |||
11121 | ||||
11122 | InvalidSTLDiagnoser UnsupportedSTLError{*this, Loc, TyForDiags(Info)}; | |||
11123 | ||||
11124 | if (!Info->Record->isTriviallyCopyable()) | |||
11125 | return UnsupportedSTLError(USS_NonTrivial); | |||
11126 | ||||
11127 | for (const CXXBaseSpecifier &BaseSpec : Info->Record->bases()) { | |||
11128 | CXXRecordDecl *Base = BaseSpec.getType()->getAsCXXRecordDecl(); | |||
11129 | // Tolerate empty base classes. | |||
11130 | if (Base->isEmpty()) | |||
11131 | continue; | |||
11132 | // Reject STL implementations which have at least one non-empty base. | |||
11133 | return UnsupportedSTLError(); | |||
11134 | } | |||
11135 | ||||
11136 | // Check that the STL has implemented the types using a single integer field. | |||
11137 | // This expectation allows better codegen for builtin operators. We require: | |||
11138 | // (1) The class has exactly one field. | |||
11139 | // (2) The field is an integral or enumeration type. | |||
11140 | auto FIt = Info->Record->field_begin(), FEnd = Info->Record->field_end(); | |||
11141 | if (std::distance(FIt, FEnd) != 1 || | |||
11142 | !FIt->getType()->isIntegralOrEnumerationType()) { | |||
11143 | return UnsupportedSTLError(); | |||
11144 | } | |||
11145 | ||||
11146 | // Build each of the require values and store them in Info. | |||
11147 | for (ComparisonCategoryResult CCR : | |||
11148 | ComparisonCategories::getPossibleResultsForType(Kind)) { | |||
11149 | StringRef MemName = ComparisonCategories::getResultString(CCR); | |||
11150 | ComparisonCategoryInfo::ValueInfo *ValInfo = Info->lookupValueInfo(CCR); | |||
11151 | ||||
11152 | if (!ValInfo) | |||
11153 | return UnsupportedSTLError(USS_MissingMember, MemName); | |||
11154 | ||||
11155 | VarDecl *VD = ValInfo->VD; | |||
11156 | assert(VD && "should not be null!")((VD && "should not be null!") ? static_cast<void> (0) : __assert_fail ("VD && \"should not be null!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11156, __PRETTY_FUNCTION__)); | |||
11157 | ||||
11158 | // Attempt to diagnose reasons why the STL definition of this type | |||
11159 | // might be foobar, including it failing to be a constant expression. | |||
11160 | // TODO Handle more ways the lookup or result can be invalid. | |||
11161 | if (!VD->isStaticDataMember() || | |||
11162 | !VD->isUsableInConstantExpressions(Context)) | |||
11163 | return UnsupportedSTLError(USS_InvalidMember, MemName, VD); | |||
11164 | ||||
11165 | // Attempt to evaluate the var decl as a constant expression and extract | |||
11166 | // the value of its first field as a ICE. If this fails, the STL | |||
11167 | // implementation is not supported. | |||
11168 | if (!ValInfo->hasValidIntValue()) | |||
11169 | return UnsupportedSTLError(); | |||
11170 | ||||
11171 | MarkVariableReferenced(Loc, VD); | |||
11172 | } | |||
11173 | ||||
11174 | // We've successfully built the required types and expressions. Update | |||
11175 | // the cache and return the newly cached value. | |||
11176 | FullyCheckedComparisonCategories[static_cast<unsigned>(Kind)] = true; | |||
11177 | return Info->getType(); | |||
11178 | } | |||
11179 | ||||
11180 | /// Retrieve the special "std" namespace, which may require us to | |||
11181 | /// implicitly define the namespace. | |||
11182 | NamespaceDecl *Sema::getOrCreateStdNamespace() { | |||
11183 | if (!StdNamespace) { | |||
11184 | // The "std" namespace has not yet been defined, so build one implicitly. | |||
11185 | StdNamespace = NamespaceDecl::Create(Context, | |||
11186 | Context.getTranslationUnitDecl(), | |||
11187 | /*Inline=*/false, | |||
11188 | SourceLocation(), SourceLocation(), | |||
11189 | &PP.getIdentifierTable().get("std"), | |||
11190 | /*PrevDecl=*/nullptr); | |||
11191 | getStdNamespace()->setImplicit(true); | |||
11192 | } | |||
11193 | ||||
11194 | return getStdNamespace(); | |||
11195 | } | |||
11196 | ||||
11197 | bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { | |||
11198 | assert(getLangOpts().CPlusPlus &&((getLangOpts().CPlusPlus && "Looking for std::initializer_list outside of C++." ) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"Looking for std::initializer_list outside of C++.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11199, __PRETTY_FUNCTION__)) | |||
11199 | "Looking for std::initializer_list outside of C++.")((getLangOpts().CPlusPlus && "Looking for std::initializer_list outside of C++." ) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"Looking for std::initializer_list outside of C++.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11199, __PRETTY_FUNCTION__)); | |||
11200 | ||||
11201 | // We're looking for implicit instantiations of | |||
11202 | // template <typename E> class std::initializer_list. | |||
11203 | ||||
11204 | if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. | |||
11205 | return false; | |||
11206 | ||||
11207 | ClassTemplateDecl *Template = nullptr; | |||
11208 | const TemplateArgument *Arguments = nullptr; | |||
11209 | ||||
11210 | if (const RecordType *RT = Ty->getAs<RecordType>()) { | |||
11211 | ||||
11212 | ClassTemplateSpecializationDecl *Specialization = | |||
11213 | dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); | |||
11214 | if (!Specialization) | |||
11215 | return false; | |||
11216 | ||||
11217 | Template = Specialization->getSpecializedTemplate(); | |||
11218 | Arguments = Specialization->getTemplateArgs().data(); | |||
11219 | } else if (const TemplateSpecializationType *TST = | |||
11220 | Ty->getAs<TemplateSpecializationType>()) { | |||
11221 | Template = dyn_cast_or_null<ClassTemplateDecl>( | |||
11222 | TST->getTemplateName().getAsTemplateDecl()); | |||
11223 | Arguments = TST->getArgs(); | |||
11224 | } | |||
11225 | if (!Template) | |||
11226 | return false; | |||
11227 | ||||
11228 | if (!StdInitializerList) { | |||
11229 | // Haven't recognized std::initializer_list yet, maybe this is it. | |||
11230 | CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); | |||
11231 | if (TemplateClass->getIdentifier() != | |||
11232 | &PP.getIdentifierTable().get("initializer_list") || | |||
11233 | !getStdNamespace()->InEnclosingNamespaceSetOf( | |||
11234 | TemplateClass->getDeclContext())) | |||
11235 | return false; | |||
11236 | // This is a template called std::initializer_list, but is it the right | |||
11237 | // template? | |||
11238 | TemplateParameterList *Params = Template->getTemplateParameters(); | |||
11239 | if (Params->getMinRequiredArguments() != 1) | |||
11240 | return false; | |||
11241 | if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) | |||
11242 | return false; | |||
11243 | ||||
11244 | // It's the right template. | |||
11245 | StdInitializerList = Template; | |||
11246 | } | |||
11247 | ||||
11248 | if (Template->getCanonicalDecl() != StdInitializerList->getCanonicalDecl()) | |||
11249 | return false; | |||
11250 | ||||
11251 | // This is an instance of std::initializer_list. Find the argument type. | |||
11252 | if (Element) | |||
11253 | *Element = Arguments[0].getAsType(); | |||
11254 | return true; | |||
11255 | } | |||
11256 | ||||
11257 | static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ | |||
11258 | NamespaceDecl *Std = S.getStdNamespace(); | |||
11259 | if (!Std) { | |||
11260 | S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); | |||
11261 | return nullptr; | |||
11262 | } | |||
11263 | ||||
11264 | LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), | |||
11265 | Loc, Sema::LookupOrdinaryName); | |||
11266 | if (!S.LookupQualifiedName(Result, Std)) { | |||
11267 | S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); | |||
11268 | return nullptr; | |||
11269 | } | |||
11270 | ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); | |||
11271 | if (!Template) { | |||
11272 | Result.suppressDiagnostics(); | |||
11273 | // We found something weird. Complain about the first thing we found. | |||
11274 | NamedDecl *Found = *Result.begin(); | |||
11275 | S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); | |||
11276 | return nullptr; | |||
11277 | } | |||
11278 | ||||
11279 | // We found some template called std::initializer_list. Now verify that it's | |||
11280 | // correct. | |||
11281 | TemplateParameterList *Params = Template->getTemplateParameters(); | |||
11282 | if (Params->getMinRequiredArguments() != 1 || | |||
11283 | !isa<TemplateTypeParmDecl>(Params->getParam(0))) { | |||
11284 | S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); | |||
11285 | return nullptr; | |||
11286 | } | |||
11287 | ||||
11288 | return Template; | |||
11289 | } | |||
11290 | ||||
11291 | QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { | |||
11292 | if (!StdInitializerList) { | |||
11293 | StdInitializerList = LookupStdInitializerList(*this, Loc); | |||
11294 | if (!StdInitializerList) | |||
11295 | return QualType(); | |||
11296 | } | |||
11297 | ||||
11298 | TemplateArgumentListInfo Args(Loc, Loc); | |||
11299 | Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), | |||
11300 | Context.getTrivialTypeSourceInfo(Element, | |||
11301 | Loc))); | |||
11302 | return Context.getCanonicalType( | |||
11303 | CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); | |||
11304 | } | |||
11305 | ||||
11306 | bool Sema::isInitListConstructor(const FunctionDecl *Ctor) { | |||
11307 | // C++ [dcl.init.list]p2: | |||
11308 | // A constructor is an initializer-list constructor if its first parameter | |||
11309 | // is of type std::initializer_list<E> or reference to possibly cv-qualified | |||
11310 | // std::initializer_list<E> for some type E, and either there are no other | |||
11311 | // parameters or else all other parameters have default arguments. | |||
11312 | if (!Ctor->hasOneParamOrDefaultArgs()) | |||
11313 | return false; | |||
11314 | ||||
11315 | QualType ArgType = Ctor->getParamDecl(0)->getType(); | |||
11316 | if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) | |||
11317 | ArgType = RT->getPointeeType().getUnqualifiedType(); | |||
11318 | ||||
11319 | return isStdInitializerList(ArgType, nullptr); | |||
11320 | } | |||
11321 | ||||
11322 | /// Determine whether a using statement is in a context where it will be | |||
11323 | /// apply in all contexts. | |||
11324 | static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { | |||
11325 | switch (CurContext->getDeclKind()) { | |||
11326 | case Decl::TranslationUnit: | |||
11327 | return true; | |||
11328 | case Decl::LinkageSpec: | |||
11329 | return IsUsingDirectiveInToplevelContext(CurContext->getParent()); | |||
11330 | default: | |||
11331 | return false; | |||
11332 | } | |||
11333 | } | |||
11334 | ||||
11335 | namespace { | |||
11336 | ||||
11337 | // Callback to only accept typo corrections that are namespaces. | |||
11338 | class NamespaceValidatorCCC final : public CorrectionCandidateCallback { | |||
11339 | public: | |||
11340 | bool ValidateCandidate(const TypoCorrection &candidate) override { | |||
11341 | if (NamedDecl *ND = candidate.getCorrectionDecl()) | |||
11342 | return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); | |||
11343 | return false; | |||
11344 | } | |||
11345 | ||||
11346 | std::unique_ptr<CorrectionCandidateCallback> clone() override { | |||
11347 | return std::make_unique<NamespaceValidatorCCC>(*this); | |||
11348 | } | |||
11349 | }; | |||
11350 | ||||
11351 | } | |||
11352 | ||||
11353 | static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, | |||
11354 | CXXScopeSpec &SS, | |||
11355 | SourceLocation IdentLoc, | |||
11356 | IdentifierInfo *Ident) { | |||
11357 | R.clear(); | |||
11358 | NamespaceValidatorCCC CCC{}; | |||
11359 | if (TypoCorrection Corrected = | |||
11360 | S.CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), Sc, &SS, CCC, | |||
11361 | Sema::CTK_ErrorRecovery)) { | |||
11362 | if (DeclContext *DC = S.computeDeclContext(SS, false)) { | |||
11363 | std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); | |||
11364 | bool DroppedSpecifier = Corrected.WillReplaceSpecifier() && | |||
11365 | Ident->getName().equals(CorrectedStr); | |||
11366 | S.diagnoseTypo(Corrected, | |||
11367 | S.PDiag(diag::err_using_directive_member_suggest) | |||
11368 | << Ident << DC << DroppedSpecifier << SS.getRange(), | |||
11369 | S.PDiag(diag::note_namespace_defined_here)); | |||
11370 | } else { | |||
11371 | S.diagnoseTypo(Corrected, | |||
11372 | S.PDiag(diag::err_using_directive_suggest) << Ident, | |||
11373 | S.PDiag(diag::note_namespace_defined_here)); | |||
11374 | } | |||
11375 | R.addDecl(Corrected.getFoundDecl()); | |||
11376 | return true; | |||
11377 | } | |||
11378 | return false; | |||
11379 | } | |||
11380 | ||||
11381 | Decl *Sema::ActOnUsingDirective(Scope *S, SourceLocation UsingLoc, | |||
11382 | SourceLocation NamespcLoc, CXXScopeSpec &SS, | |||
11383 | SourceLocation IdentLoc, | |||
11384 | IdentifierInfo *NamespcName, | |||
11385 | const ParsedAttributesView &AttrList) { | |||
11386 | assert(!SS.isInvalid() && "Invalid CXXScopeSpec.")((!SS.isInvalid() && "Invalid CXXScopeSpec.") ? static_cast <void> (0) : __assert_fail ("!SS.isInvalid() && \"Invalid CXXScopeSpec.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11386, __PRETTY_FUNCTION__)); | |||
11387 | assert(NamespcName && "Invalid NamespcName.")((NamespcName && "Invalid NamespcName.") ? static_cast <void> (0) : __assert_fail ("NamespcName && \"Invalid NamespcName.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11387, __PRETTY_FUNCTION__)); | |||
11388 | assert(IdentLoc.isValid() && "Invalid NamespceName location.")((IdentLoc.isValid() && "Invalid NamespceName location." ) ? static_cast<void> (0) : __assert_fail ("IdentLoc.isValid() && \"Invalid NamespceName location.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11388, __PRETTY_FUNCTION__)); | |||
11389 | ||||
11390 | // This can only happen along a recovery path. | |||
11391 | while (S->isTemplateParamScope()) | |||
11392 | S = S->getParent(); | |||
11393 | assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.")((S->getFlags() & Scope::DeclScope && "Invalid Scope." ) ? static_cast<void> (0) : __assert_fail ("S->getFlags() & Scope::DeclScope && \"Invalid Scope.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11393, __PRETTY_FUNCTION__)); | |||
11394 | ||||
11395 | UsingDirectiveDecl *UDir = nullptr; | |||
11396 | NestedNameSpecifier *Qualifier = nullptr; | |||
11397 | if (SS.isSet()) | |||
11398 | Qualifier = SS.getScopeRep(); | |||
11399 | ||||
11400 | // Lookup namespace name. | |||
11401 | LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); | |||
11402 | LookupParsedName(R, S, &SS); | |||
11403 | if (R.isAmbiguous()) | |||
11404 | return nullptr; | |||
11405 | ||||
11406 | if (R.empty()) { | |||
11407 | R.clear(); | |||
11408 | // Allow "using namespace std;" or "using namespace ::std;" even if | |||
11409 | // "std" hasn't been defined yet, for GCC compatibility. | |||
11410 | if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && | |||
11411 | NamespcName->isStr("std")) { | |||
11412 | Diag(IdentLoc, diag::ext_using_undefined_std); | |||
11413 | R.addDecl(getOrCreateStdNamespace()); | |||
11414 | R.resolveKind(); | |||
11415 | } | |||
11416 | // Otherwise, attempt typo correction. | |||
11417 | else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); | |||
11418 | } | |||
11419 | ||||
11420 | if (!R.empty()) { | |||
11421 | NamedDecl *Named = R.getRepresentativeDecl(); | |||
11422 | NamespaceDecl *NS = R.getAsSingle<NamespaceDecl>(); | |||
11423 | assert(NS && "expected namespace decl")((NS && "expected namespace decl") ? static_cast<void > (0) : __assert_fail ("NS && \"expected namespace decl\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11423, __PRETTY_FUNCTION__)); | |||
11424 | ||||
11425 | // The use of a nested name specifier may trigger deprecation warnings. | |||
11426 | DiagnoseUseOfDecl(Named, IdentLoc); | |||
11427 | ||||
11428 | // C++ [namespace.udir]p1: | |||
11429 | // A using-directive specifies that the names in the nominated | |||
11430 | // namespace can be used in the scope in which the | |||
11431 | // using-directive appears after the using-directive. During | |||
11432 | // unqualified name lookup (3.4.1), the names appear as if they | |||
11433 | // were declared in the nearest enclosing namespace which | |||
11434 | // contains both the using-directive and the nominated | |||
11435 | // namespace. [Note: in this context, "contains" means "contains | |||
11436 | // directly or indirectly". ] | |||
11437 | ||||
11438 | // Find enclosing context containing both using-directive and | |||
11439 | // nominated namespace. | |||
11440 | DeclContext *CommonAncestor = NS; | |||
11441 | while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) | |||
11442 | CommonAncestor = CommonAncestor->getParent(); | |||
11443 | ||||
11444 | UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, | |||
11445 | SS.getWithLocInContext(Context), | |||
11446 | IdentLoc, Named, CommonAncestor); | |||
11447 | ||||
11448 | if (IsUsingDirectiveInToplevelContext(CurContext) && | |||
11449 | !SourceMgr.isInMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { | |||
11450 | Diag(IdentLoc, diag::warn_using_directive_in_header); | |||
11451 | } | |||
11452 | ||||
11453 | PushUsingDirective(S, UDir); | |||
11454 | } else { | |||
11455 | Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); | |||
11456 | } | |||
11457 | ||||
11458 | if (UDir) | |||
11459 | ProcessDeclAttributeList(S, UDir, AttrList); | |||
11460 | ||||
11461 | return UDir; | |||
11462 | } | |||
11463 | ||||
11464 | void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { | |||
11465 | // If the scope has an associated entity and the using directive is at | |||
11466 | // namespace or translation unit scope, add the UsingDirectiveDecl into | |||
11467 | // its lookup structure so qualified name lookup can find it. | |||
11468 | DeclContext *Ctx = S->getEntity(); | |||
11469 | if (Ctx && !Ctx->isFunctionOrMethod()) | |||
11470 | Ctx->addDecl(UDir); | |||
11471 | else | |||
11472 | // Otherwise, it is at block scope. The using-directives will affect lookup | |||
11473 | // only to the end of the scope. | |||
11474 | S->PushUsingDirective(UDir); | |||
11475 | } | |||
11476 | ||||
11477 | Decl *Sema::ActOnUsingDeclaration(Scope *S, AccessSpecifier AS, | |||
11478 | SourceLocation UsingLoc, | |||
11479 | SourceLocation TypenameLoc, CXXScopeSpec &SS, | |||
11480 | UnqualifiedId &Name, | |||
11481 | SourceLocation EllipsisLoc, | |||
11482 | const ParsedAttributesView &AttrList) { | |||
11483 | assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.")((S->getFlags() & Scope::DeclScope && "Invalid Scope." ) ? static_cast<void> (0) : __assert_fail ("S->getFlags() & Scope::DeclScope && \"Invalid Scope.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11483, __PRETTY_FUNCTION__)); | |||
11484 | ||||
11485 | if (SS.isEmpty()) { | |||
11486 | Diag(Name.getBeginLoc(), diag::err_using_requires_qualname); | |||
11487 | return nullptr; | |||
11488 | } | |||
11489 | ||||
11490 | switch (Name.getKind()) { | |||
11491 | case UnqualifiedIdKind::IK_ImplicitSelfParam: | |||
11492 | case UnqualifiedIdKind::IK_Identifier: | |||
11493 | case UnqualifiedIdKind::IK_OperatorFunctionId: | |||
11494 | case UnqualifiedIdKind::IK_LiteralOperatorId: | |||
11495 | case UnqualifiedIdKind::IK_ConversionFunctionId: | |||
11496 | break; | |||
11497 | ||||
11498 | case UnqualifiedIdKind::IK_ConstructorName: | |||
11499 | case UnqualifiedIdKind::IK_ConstructorTemplateId: | |||
11500 | // C++11 inheriting constructors. | |||
11501 | Diag(Name.getBeginLoc(), | |||
11502 | getLangOpts().CPlusPlus11 | |||
11503 | ? diag::warn_cxx98_compat_using_decl_constructor | |||
11504 | : diag::err_using_decl_constructor) | |||
11505 | << SS.getRange(); | |||
11506 | ||||
11507 | if (getLangOpts().CPlusPlus11) break; | |||
11508 | ||||
11509 | return nullptr; | |||
11510 | ||||
11511 | case UnqualifiedIdKind::IK_DestructorName: | |||
11512 | Diag(Name.getBeginLoc(), diag::err_using_decl_destructor) << SS.getRange(); | |||
11513 | return nullptr; | |||
11514 | ||||
11515 | case UnqualifiedIdKind::IK_TemplateId: | |||
11516 | Diag(Name.getBeginLoc(), diag::err_using_decl_template_id) | |||
11517 | << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); | |||
11518 | return nullptr; | |||
11519 | ||||
11520 | case UnqualifiedIdKind::IK_DeductionGuideName: | |||
11521 | llvm_unreachable("cannot parse qualified deduction guide name")::llvm::llvm_unreachable_internal("cannot parse qualified deduction guide name" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11521); | |||
11522 | } | |||
11523 | ||||
11524 | DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); | |||
11525 | DeclarationName TargetName = TargetNameInfo.getName(); | |||
11526 | if (!TargetName) | |||
11527 | return nullptr; | |||
11528 | ||||
11529 | // Warn about access declarations. | |||
11530 | if (UsingLoc.isInvalid()) { | |||
11531 | Diag(Name.getBeginLoc(), getLangOpts().CPlusPlus11 | |||
11532 | ? diag::err_access_decl | |||
11533 | : diag::warn_access_decl_deprecated) | |||
11534 | << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); | |||
11535 | } | |||
11536 | ||||
11537 | if (EllipsisLoc.isInvalid()) { | |||
11538 | if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || | |||
11539 | DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) | |||
11540 | return nullptr; | |||
11541 | } else { | |||
11542 | if (!SS.getScopeRep()->containsUnexpandedParameterPack() && | |||
11543 | !TargetNameInfo.containsUnexpandedParameterPack()) { | |||
11544 | Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) | |||
11545 | << SourceRange(SS.getBeginLoc(), TargetNameInfo.getEndLoc()); | |||
11546 | EllipsisLoc = SourceLocation(); | |||
11547 | } | |||
11548 | } | |||
11549 | ||||
11550 | NamedDecl *UD = | |||
11551 | BuildUsingDeclaration(S, AS, UsingLoc, TypenameLoc.isValid(), TypenameLoc, | |||
11552 | SS, TargetNameInfo, EllipsisLoc, AttrList, | |||
11553 | /*IsInstantiation*/false); | |||
11554 | if (UD) | |||
11555 | PushOnScopeChains(UD, S, /*AddToContext*/ false); | |||
11556 | ||||
11557 | return UD; | |||
11558 | } | |||
11559 | ||||
11560 | /// Determine whether a using declaration considers the given | |||
11561 | /// declarations as "equivalent", e.g., if they are redeclarations of | |||
11562 | /// the same entity or are both typedefs of the same type. | |||
11563 | static bool | |||
11564 | IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2) { | |||
11565 | if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) | |||
11566 | return true; | |||
11567 | ||||
11568 | if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) | |||
11569 | if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) | |||
11570 | return Context.hasSameType(TD1->getUnderlyingType(), | |||
11571 | TD2->getUnderlyingType()); | |||
11572 | ||||
11573 | return false; | |||
11574 | } | |||
11575 | ||||
11576 | ||||
11577 | /// Determines whether to create a using shadow decl for a particular | |||
11578 | /// decl, given the set of decls existing prior to this using lookup. | |||
11579 | bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, | |||
11580 | const LookupResult &Previous, | |||
11581 | UsingShadowDecl *&PrevShadow) { | |||
11582 | // Diagnose finding a decl which is not from a base class of the | |||
11583 | // current class. We do this now because there are cases where this | |||
11584 | // function will silently decide not to build a shadow decl, which | |||
11585 | // will pre-empt further diagnostics. | |||
11586 | // | |||
11587 | // We don't need to do this in C++11 because we do the check once on | |||
11588 | // the qualifier. | |||
11589 | // | |||
11590 | // FIXME: diagnose the following if we care enough: | |||
11591 | // struct A { int foo; }; | |||
11592 | // struct B : A { using A::foo; }; | |||
11593 | // template <class T> struct C : A {}; | |||
11594 | // template <class T> struct D : C<T> { using B::foo; } // <--- | |||
11595 | // This is invalid (during instantiation) in C++03 because B::foo | |||
11596 | // resolves to the using decl in B, which is not a base class of D<T>. | |||
11597 | // We can't diagnose it immediately because C<T> is an unknown | |||
11598 | // specialization. The UsingShadowDecl in D<T> then points directly | |||
11599 | // to A::foo, which will look well-formed when we instantiate. | |||
11600 | // The right solution is to not collapse the shadow-decl chain. | |||
11601 | if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) { | |||
11602 | DeclContext *OrigDC = Orig->getDeclContext(); | |||
11603 | ||||
11604 | // Handle enums and anonymous structs. | |||
11605 | if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); | |||
11606 | CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); | |||
11607 | while (OrigRec->isAnonymousStructOrUnion()) | |||
11608 | OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); | |||
11609 | ||||
11610 | if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { | |||
11611 | if (OrigDC == CurContext) { | |||
11612 | Diag(Using->getLocation(), | |||
11613 | diag::err_using_decl_nested_name_specifier_is_current_class) | |||
11614 | << Using->getQualifierLoc().getSourceRange(); | |||
11615 | Diag(Orig->getLocation(), diag::note_using_decl_target); | |||
11616 | Using->setInvalidDecl(); | |||
11617 | return true; | |||
11618 | } | |||
11619 | ||||
11620 | Diag(Using->getQualifierLoc().getBeginLoc(), | |||
11621 | diag::err_using_decl_nested_name_specifier_is_not_base_class) | |||
11622 | << Using->getQualifier() | |||
11623 | << cast<CXXRecordDecl>(CurContext) | |||
11624 | << Using->getQualifierLoc().getSourceRange(); | |||
11625 | Diag(Orig->getLocation(), diag::note_using_decl_target); | |||
11626 | Using->setInvalidDecl(); | |||
11627 | return true; | |||
11628 | } | |||
11629 | } | |||
11630 | ||||
11631 | if (Previous.empty()) return false; | |||
11632 | ||||
11633 | NamedDecl *Target = Orig; | |||
11634 | if (isa<UsingShadowDecl>(Target)) | |||
11635 | Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); | |||
11636 | ||||
11637 | // If the target happens to be one of the previous declarations, we | |||
11638 | // don't have a conflict. | |||
11639 | // | |||
11640 | // FIXME: but we might be increasing its access, in which case we | |||
11641 | // should redeclare it. | |||
11642 | NamedDecl *NonTag = nullptr, *Tag = nullptr; | |||
11643 | bool FoundEquivalentDecl = false; | |||
11644 | for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); | |||
11645 | I != E; ++I) { | |||
11646 | NamedDecl *D = (*I)->getUnderlyingDecl(); | |||
11647 | // We can have UsingDecls in our Previous results because we use the same | |||
11648 | // LookupResult for checking whether the UsingDecl itself is a valid | |||
11649 | // redeclaration. | |||
11650 | if (isa<UsingDecl>(D) || isa<UsingPackDecl>(D)) | |||
11651 | continue; | |||
11652 | ||||
11653 | if (auto *RD = dyn_cast<CXXRecordDecl>(D)) { | |||
11654 | // C++ [class.mem]p19: | |||
11655 | // If T is the name of a class, then [every named member other than | |||
11656 | // a non-static data member] shall have a name different from T | |||
11657 | if (RD->isInjectedClassName() && !isa<FieldDecl>(Target) && | |||
11658 | !isa<IndirectFieldDecl>(Target) && | |||
11659 | !isa<UnresolvedUsingValueDecl>(Target) && | |||
11660 | DiagnoseClassNameShadow( | |||
11661 | CurContext, | |||
11662 | DeclarationNameInfo(Using->getDeclName(), Using->getLocation()))) | |||
11663 | return true; | |||
11664 | } | |||
11665 | ||||
11666 | if (IsEquivalentForUsingDecl(Context, D, Target)) { | |||
11667 | if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(*I)) | |||
11668 | PrevShadow = Shadow; | |||
11669 | FoundEquivalentDecl = true; | |||
11670 | } else if (isEquivalentInternalLinkageDeclaration(D, Target)) { | |||
11671 | // We don't conflict with an existing using shadow decl of an equivalent | |||
11672 | // declaration, but we're not a redeclaration of it. | |||
11673 | FoundEquivalentDecl = true; | |||
11674 | } | |||
11675 | ||||
11676 | if (isVisible(D)) | |||
11677 | (isa<TagDecl>(D) ? Tag : NonTag) = D; | |||
11678 | } | |||
11679 | ||||
11680 | if (FoundEquivalentDecl) | |||
11681 | return false; | |||
11682 | ||||
11683 | if (FunctionDecl *FD = Target->getAsFunction()) { | |||
11684 | NamedDecl *OldDecl = nullptr; | |||
11685 | switch (CheckOverload(nullptr, FD, Previous, OldDecl, | |||
11686 | /*IsForUsingDecl*/ true)) { | |||
11687 | case Ovl_Overload: | |||
11688 | return false; | |||
11689 | ||||
11690 | case Ovl_NonFunction: | |||
11691 | Diag(Using->getLocation(), diag::err_using_decl_conflict); | |||
11692 | break; | |||
11693 | ||||
11694 | // We found a decl with the exact signature. | |||
11695 | case Ovl_Match: | |||
11696 | // If we're in a record, we want to hide the target, so we | |||
11697 | // return true (without a diagnostic) to tell the caller not to | |||
11698 | // build a shadow decl. | |||
11699 | if (CurContext->isRecord()) | |||
11700 | return true; | |||
11701 | ||||
11702 | // If we're not in a record, this is an error. | |||
11703 | Diag(Using->getLocation(), diag::err_using_decl_conflict); | |||
11704 | break; | |||
11705 | } | |||
11706 | ||||
11707 | Diag(Target->getLocation(), diag::note_using_decl_target); | |||
11708 | Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); | |||
11709 | Using->setInvalidDecl(); | |||
11710 | return true; | |||
11711 | } | |||
11712 | ||||
11713 | // Target is not a function. | |||
11714 | ||||
11715 | if (isa<TagDecl>(Target)) { | |||
11716 | // No conflict between a tag and a non-tag. | |||
11717 | if (!Tag) return false; | |||
11718 | ||||
11719 | Diag(Using->getLocation(), diag::err_using_decl_conflict); | |||
11720 | Diag(Target->getLocation(), diag::note_using_decl_target); | |||
11721 | Diag(Tag->getLocation(), diag::note_using_decl_conflict); | |||
11722 | Using->setInvalidDecl(); | |||
11723 | return true; | |||
11724 | } | |||
11725 | ||||
11726 | // No conflict between a tag and a non-tag. | |||
11727 | if (!NonTag) return false; | |||
11728 | ||||
11729 | Diag(Using->getLocation(), diag::err_using_decl_conflict); | |||
11730 | Diag(Target->getLocation(), diag::note_using_decl_target); | |||
11731 | Diag(NonTag->getLocation(), diag::note_using_decl_conflict); | |||
11732 | Using->setInvalidDecl(); | |||
11733 | return true; | |||
11734 | } | |||
11735 | ||||
11736 | /// Determine whether a direct base class is a virtual base class. | |||
11737 | static bool isVirtualDirectBase(CXXRecordDecl *Derived, CXXRecordDecl *Base) { | |||
11738 | if (!Derived->getNumVBases()) | |||
11739 | return false; | |||
11740 | for (auto &B : Derived->bases()) | |||
11741 | if (B.getType()->getAsCXXRecordDecl() == Base) | |||
11742 | return B.isVirtual(); | |||
11743 | llvm_unreachable("not a direct base class")::llvm::llvm_unreachable_internal("not a direct base class", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11743); | |||
11744 | } | |||
11745 | ||||
11746 | /// Builds a shadow declaration corresponding to a 'using' declaration. | |||
11747 | UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, | |||
11748 | UsingDecl *UD, | |||
11749 | NamedDecl *Orig, | |||
11750 | UsingShadowDecl *PrevDecl) { | |||
11751 | // If we resolved to another shadow declaration, just coalesce them. | |||
11752 | NamedDecl *Target = Orig; | |||
11753 | if (isa<UsingShadowDecl>(Target)) { | |||
11754 | Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); | |||
11755 | assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration")((!isa<UsingShadowDecl>(Target) && "nested shadow declaration" ) ? static_cast<void> (0) : __assert_fail ("!isa<UsingShadowDecl>(Target) && \"nested shadow declaration\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11755, __PRETTY_FUNCTION__)); | |||
11756 | } | |||
11757 | ||||
11758 | NamedDecl *NonTemplateTarget = Target; | |||
11759 | if (auto *TargetTD = dyn_cast<TemplateDecl>(Target)) | |||
11760 | NonTemplateTarget = TargetTD->getTemplatedDecl(); | |||
11761 | ||||
11762 | UsingShadowDecl *Shadow; | |||
11763 | if (NonTemplateTarget && isa<CXXConstructorDecl>(NonTemplateTarget)) { | |||
11764 | bool IsVirtualBase = | |||
11765 | isVirtualDirectBase(cast<CXXRecordDecl>(CurContext), | |||
11766 | UD->getQualifier()->getAsRecordDecl()); | |||
11767 | Shadow = ConstructorUsingShadowDecl::Create( | |||
11768 | Context, CurContext, UD->getLocation(), UD, Orig, IsVirtualBase); | |||
11769 | } else { | |||
11770 | Shadow = UsingShadowDecl::Create(Context, CurContext, UD->getLocation(), UD, | |||
11771 | Target); | |||
11772 | } | |||
11773 | UD->addShadowDecl(Shadow); | |||
11774 | ||||
11775 | Shadow->setAccess(UD->getAccess()); | |||
11776 | if (Orig->isInvalidDecl() || UD->isInvalidDecl()) | |||
11777 | Shadow->setInvalidDecl(); | |||
11778 | ||||
11779 | Shadow->setPreviousDecl(PrevDecl); | |||
11780 | ||||
11781 | if (S) | |||
11782 | PushOnScopeChains(Shadow, S); | |||
11783 | else | |||
11784 | CurContext->addDecl(Shadow); | |||
11785 | ||||
11786 | ||||
11787 | return Shadow; | |||
11788 | } | |||
11789 | ||||
11790 | /// Hides a using shadow declaration. This is required by the current | |||
11791 | /// using-decl implementation when a resolvable using declaration in a | |||
11792 | /// class is followed by a declaration which would hide or override | |||
11793 | /// one or more of the using decl's targets; for example: | |||
11794 | /// | |||
11795 | /// struct Base { void foo(int); }; | |||
11796 | /// struct Derived : Base { | |||
11797 | /// using Base::foo; | |||
11798 | /// void foo(int); | |||
11799 | /// }; | |||
11800 | /// | |||
11801 | /// The governing language is C++03 [namespace.udecl]p12: | |||
11802 | /// | |||
11803 | /// When a using-declaration brings names from a base class into a | |||
11804 | /// derived class scope, member functions in the derived class | |||
11805 | /// override and/or hide member functions with the same name and | |||
11806 | /// parameter types in a base class (rather than conflicting). | |||
11807 | /// | |||
11808 | /// There are two ways to implement this: | |||
11809 | /// (1) optimistically create shadow decls when they're not hidden | |||
11810 | /// by existing declarations, or | |||
11811 | /// (2) don't create any shadow decls (or at least don't make them | |||
11812 | /// visible) until we've fully parsed/instantiated the class. | |||
11813 | /// The problem with (1) is that we might have to retroactively remove | |||
11814 | /// a shadow decl, which requires several O(n) operations because the | |||
11815 | /// decl structures are (very reasonably) not designed for removal. | |||
11816 | /// (2) avoids this but is very fiddly and phase-dependent. | |||
11817 | void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { | |||
11818 | if (Shadow->getDeclName().getNameKind() == | |||
11819 | DeclarationName::CXXConversionFunctionName) | |||
11820 | cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); | |||
11821 | ||||
11822 | // Remove it from the DeclContext... | |||
11823 | Shadow->getDeclContext()->removeDecl(Shadow); | |||
11824 | ||||
11825 | // ...and the scope, if applicable... | |||
11826 | if (S) { | |||
11827 | S->RemoveDecl(Shadow); | |||
11828 | IdResolver.RemoveDecl(Shadow); | |||
11829 | } | |||
11830 | ||||
11831 | // ...and the using decl. | |||
11832 | Shadow->getUsingDecl()->removeShadowDecl(Shadow); | |||
11833 | ||||
11834 | // TODO: complain somehow if Shadow was used. It shouldn't | |||
11835 | // be possible for this to happen, because...? | |||
11836 | } | |||
11837 | ||||
11838 | /// Find the base specifier for a base class with the given type. | |||
11839 | static CXXBaseSpecifier *findDirectBaseWithType(CXXRecordDecl *Derived, | |||
11840 | QualType DesiredBase, | |||
11841 | bool &AnyDependentBases) { | |||
11842 | // Check whether the named type is a direct base class. | |||
11843 | CanQualType CanonicalDesiredBase = DesiredBase->getCanonicalTypeUnqualified() | |||
11844 | .getUnqualifiedType(); | |||
11845 | for (auto &Base : Derived->bases()) { | |||
11846 | CanQualType BaseType = Base.getType()->getCanonicalTypeUnqualified(); | |||
11847 | if (CanonicalDesiredBase == BaseType) | |||
11848 | return &Base; | |||
11849 | if (BaseType->isDependentType()) | |||
11850 | AnyDependentBases = true; | |||
11851 | } | |||
11852 | return nullptr; | |||
11853 | } | |||
11854 | ||||
11855 | namespace { | |||
11856 | class UsingValidatorCCC final : public CorrectionCandidateCallback { | |||
11857 | public: | |||
11858 | UsingValidatorCCC(bool HasTypenameKeyword, bool IsInstantiation, | |||
11859 | NestedNameSpecifier *NNS, CXXRecordDecl *RequireMemberOf) | |||
11860 | : HasTypenameKeyword(HasTypenameKeyword), | |||
11861 | IsInstantiation(IsInstantiation), OldNNS(NNS), | |||
11862 | RequireMemberOf(RequireMemberOf) {} | |||
11863 | ||||
11864 | bool ValidateCandidate(const TypoCorrection &Candidate) override { | |||
11865 | NamedDecl *ND = Candidate.getCorrectionDecl(); | |||
11866 | ||||
11867 | // Keywords are not valid here. | |||
11868 | if (!ND || isa<NamespaceDecl>(ND)) | |||
11869 | return false; | |||
11870 | ||||
11871 | // Completely unqualified names are invalid for a 'using' declaration. | |||
11872 | if (Candidate.WillReplaceSpecifier() && !Candidate.getCorrectionSpecifier()) | |||
11873 | return false; | |||
11874 | ||||
11875 | // FIXME: Don't correct to a name that CheckUsingDeclRedeclaration would | |||
11876 | // reject. | |||
11877 | ||||
11878 | if (RequireMemberOf) { | |||
11879 | auto *FoundRecord = dyn_cast<CXXRecordDecl>(ND); | |||
11880 | if (FoundRecord && FoundRecord->isInjectedClassName()) { | |||
11881 | // No-one ever wants a using-declaration to name an injected-class-name | |||
11882 | // of a base class, unless they're declaring an inheriting constructor. | |||
11883 | ASTContext &Ctx = ND->getASTContext(); | |||
11884 | if (!Ctx.getLangOpts().CPlusPlus11) | |||
11885 | return false; | |||
11886 | QualType FoundType = Ctx.getRecordType(FoundRecord); | |||
11887 | ||||
11888 | // Check that the injected-class-name is named as a member of its own | |||
11889 | // type; we don't want to suggest 'using Derived::Base;', since that | |||
11890 | // means something else. | |||
11891 | NestedNameSpecifier *Specifier = | |||
11892 | Candidate.WillReplaceSpecifier() | |||
11893 | ? Candidate.getCorrectionSpecifier() | |||
11894 | : OldNNS; | |||
11895 | if (!Specifier->getAsType() || | |||
11896 | !Ctx.hasSameType(QualType(Specifier->getAsType(), 0), FoundType)) | |||
11897 | return false; | |||
11898 | ||||
11899 | // Check that this inheriting constructor declaration actually names a | |||
11900 | // direct base class of the current class. | |||
11901 | bool AnyDependentBases = false; | |||
11902 | if (!findDirectBaseWithType(RequireMemberOf, | |||
11903 | Ctx.getRecordType(FoundRecord), | |||
11904 | AnyDependentBases) && | |||
11905 | !AnyDependentBases) | |||
11906 | return false; | |||
11907 | } else { | |||
11908 | auto *RD = dyn_cast<CXXRecordDecl>(ND->getDeclContext()); | |||
11909 | if (!RD || RequireMemberOf->isProvablyNotDerivedFrom(RD)) | |||
11910 | return false; | |||
11911 | ||||
11912 | // FIXME: Check that the base class member is accessible? | |||
11913 | } | |||
11914 | } else { | |||
11915 | auto *FoundRecord = dyn_cast<CXXRecordDecl>(ND); | |||
11916 | if (FoundRecord && FoundRecord->isInjectedClassName()) | |||
11917 | return false; | |||
11918 | } | |||
11919 | ||||
11920 | if (isa<TypeDecl>(ND)) | |||
11921 | return HasTypenameKeyword || !IsInstantiation; | |||
11922 | ||||
11923 | return !HasTypenameKeyword; | |||
11924 | } | |||
11925 | ||||
11926 | std::unique_ptr<CorrectionCandidateCallback> clone() override { | |||
11927 | return std::make_unique<UsingValidatorCCC>(*this); | |||
11928 | } | |||
11929 | ||||
11930 | private: | |||
11931 | bool HasTypenameKeyword; | |||
11932 | bool IsInstantiation; | |||
11933 | NestedNameSpecifier *OldNNS; | |||
11934 | CXXRecordDecl *RequireMemberOf; | |||
11935 | }; | |||
11936 | } // end anonymous namespace | |||
11937 | ||||
11938 | /// Builds a using declaration. | |||
11939 | /// | |||
11940 | /// \param IsInstantiation - Whether this call arises from an | |||
11941 | /// instantiation of an unresolved using declaration. We treat | |||
11942 | /// the lookup differently for these declarations. | |||
11943 | NamedDecl *Sema::BuildUsingDeclaration( | |||
11944 | Scope *S, AccessSpecifier AS, SourceLocation UsingLoc, | |||
11945 | bool HasTypenameKeyword, SourceLocation TypenameLoc, CXXScopeSpec &SS, | |||
11946 | DeclarationNameInfo NameInfo, SourceLocation EllipsisLoc, | |||
11947 | const ParsedAttributesView &AttrList, bool IsInstantiation) { | |||
11948 | assert(!SS.isInvalid() && "Invalid CXXScopeSpec.")((!SS.isInvalid() && "Invalid CXXScopeSpec.") ? static_cast <void> (0) : __assert_fail ("!SS.isInvalid() && \"Invalid CXXScopeSpec.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11948, __PRETTY_FUNCTION__)); | |||
11949 | SourceLocation IdentLoc = NameInfo.getLoc(); | |||
11950 | assert(IdentLoc.isValid() && "Invalid TargetName location.")((IdentLoc.isValid() && "Invalid TargetName location." ) ? static_cast<void> (0) : __assert_fail ("IdentLoc.isValid() && \"Invalid TargetName location.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11950, __PRETTY_FUNCTION__)); | |||
11951 | ||||
11952 | // FIXME: We ignore attributes for now. | |||
11953 | ||||
11954 | // For an inheriting constructor declaration, the name of the using | |||
11955 | // declaration is the name of a constructor in this class, not in the | |||
11956 | // base class. | |||
11957 | DeclarationNameInfo UsingName = NameInfo; | |||
11958 | if (UsingName.getName().getNameKind() == DeclarationName::CXXConstructorName) | |||
11959 | if (auto *RD = dyn_cast<CXXRecordDecl>(CurContext)) | |||
11960 | UsingName.setName(Context.DeclarationNames.getCXXConstructorName( | |||
11961 | Context.getCanonicalType(Context.getRecordType(RD)))); | |||
11962 | ||||
11963 | // Do the redeclaration lookup in the current scope. | |||
11964 | LookupResult Previous(*this, UsingName, LookupUsingDeclName, | |||
11965 | ForVisibleRedeclaration); | |||
11966 | Previous.setHideTags(false); | |||
11967 | if (S) { | |||
11968 | LookupName(Previous, S); | |||
11969 | ||||
11970 | // It is really dumb that we have to do this. | |||
11971 | LookupResult::Filter F = Previous.makeFilter(); | |||
11972 | while (F.hasNext()) { | |||
11973 | NamedDecl *D = F.next(); | |||
11974 | if (!isDeclInScope(D, CurContext, S)) | |||
11975 | F.erase(); | |||
11976 | // If we found a local extern declaration that's not ordinarily visible, | |||
11977 | // and this declaration is being added to a non-block scope, ignore it. | |||
11978 | // We're only checking for scope conflicts here, not also for violations | |||
11979 | // of the linkage rules. | |||
11980 | else if (!CurContext->isFunctionOrMethod() && D->isLocalExternDecl() && | |||
11981 | !(D->getIdentifierNamespace() & Decl::IDNS_Ordinary)) | |||
11982 | F.erase(); | |||
11983 | } | |||
11984 | F.done(); | |||
11985 | } else { | |||
11986 | assert(IsInstantiation && "no scope in non-instantiation")((IsInstantiation && "no scope in non-instantiation") ? static_cast<void> (0) : __assert_fail ("IsInstantiation && \"no scope in non-instantiation\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 11986, __PRETTY_FUNCTION__)); | |||
11987 | if (CurContext->isRecord()) | |||
11988 | LookupQualifiedName(Previous, CurContext); | |||
11989 | else { | |||
11990 | // No redeclaration check is needed here; in non-member contexts we | |||
11991 | // diagnosed all possible conflicts with other using-declarations when | |||
11992 | // building the template: | |||
11993 | // | |||
11994 | // For a dependent non-type using declaration, the only valid case is | |||
11995 | // if we instantiate to a single enumerator. We check for conflicts | |||
11996 | // between shadow declarations we introduce, and we check in the template | |||
11997 | // definition for conflicts between a non-type using declaration and any | |||
11998 | // other declaration, which together covers all cases. | |||
11999 | // | |||
12000 | // A dependent typename using declaration will never successfully | |||
12001 | // instantiate, since it will always name a class member, so we reject | |||
12002 | // that in the template definition. | |||
12003 | } | |||
12004 | } | |||
12005 | ||||
12006 | // Check for invalid redeclarations. | |||
12007 | if (CheckUsingDeclRedeclaration(UsingLoc, HasTypenameKeyword, | |||
12008 | SS, IdentLoc, Previous)) | |||
12009 | return nullptr; | |||
12010 | ||||
12011 | // Check for bad qualifiers. | |||
12012 | if (CheckUsingDeclQualifier(UsingLoc, HasTypenameKeyword, SS, NameInfo, | |||
12013 | IdentLoc)) | |||
12014 | return nullptr; | |||
12015 | ||||
12016 | DeclContext *LookupContext = computeDeclContext(SS); | |||
12017 | NamedDecl *D; | |||
12018 | NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); | |||
12019 | if (!LookupContext || EllipsisLoc.isValid()) { | |||
12020 | if (HasTypenameKeyword) { | |||
12021 | // FIXME: not all declaration name kinds are legal here | |||
12022 | D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, | |||
12023 | UsingLoc, TypenameLoc, | |||
12024 | QualifierLoc, | |||
12025 | IdentLoc, NameInfo.getName(), | |||
12026 | EllipsisLoc); | |||
12027 | } else { | |||
12028 | D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, | |||
12029 | QualifierLoc, NameInfo, EllipsisLoc); | |||
12030 | } | |||
12031 | D->setAccess(AS); | |||
12032 | CurContext->addDecl(D); | |||
12033 | return D; | |||
12034 | } | |||
12035 | ||||
12036 | auto Build = [&](bool Invalid) { | |||
12037 | UsingDecl *UD = | |||
12038 | UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, | |||
12039 | UsingName, HasTypenameKeyword); | |||
12040 | UD->setAccess(AS); | |||
12041 | CurContext->addDecl(UD); | |||
12042 | UD->setInvalidDecl(Invalid); | |||
12043 | return UD; | |||
12044 | }; | |||
12045 | auto BuildInvalid = [&]{ return Build(true); }; | |||
12046 | auto BuildValid = [&]{ return Build(false); }; | |||
12047 | ||||
12048 | if (RequireCompleteDeclContext(SS, LookupContext)) | |||
12049 | return BuildInvalid(); | |||
12050 | ||||
12051 | // Look up the target name. | |||
12052 | LookupResult R(*this, NameInfo, LookupOrdinaryName); | |||
12053 | ||||
12054 | // Unlike most lookups, we don't always want to hide tag | |||
12055 | // declarations: tag names are visible through the using declaration | |||
12056 | // even if hidden by ordinary names, *except* in a dependent context | |||
12057 | // where it's important for the sanity of two-phase lookup. | |||
12058 | if (!IsInstantiation) | |||
12059 | R.setHideTags(false); | |||
12060 | ||||
12061 | // For the purposes of this lookup, we have a base object type | |||
12062 | // equal to that of the current context. | |||
12063 | if (CurContext->isRecord()) { | |||
12064 | R.setBaseObjectType( | |||
12065 | Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); | |||
12066 | } | |||
12067 | ||||
12068 | LookupQualifiedName(R, LookupContext); | |||
12069 | ||||
12070 | // Try to correct typos if possible. If constructor name lookup finds no | |||
12071 | // results, that means the named class has no explicit constructors, and we | |||
12072 | // suppressed declaring implicit ones (probably because it's dependent or | |||
12073 | // invalid). | |||
12074 | if (R.empty() && | |||
12075 | NameInfo.getName().getNameKind() != DeclarationName::CXXConstructorName) { | |||
12076 | // HACK: Work around a bug in libstdc++'s detection of ::gets. Sometimes | |||
12077 | // it will believe that glibc provides a ::gets in cases where it does not, | |||
12078 | // and will try to pull it into namespace std with a using-declaration. | |||
12079 | // Just ignore the using-declaration in that case. | |||
12080 | auto *II = NameInfo.getName().getAsIdentifierInfo(); | |||
12081 | if (getLangOpts().CPlusPlus14 && II && II->isStr("gets") && | |||
12082 | CurContext->isStdNamespace() && | |||
12083 | isa<TranslationUnitDecl>(LookupContext) && | |||
12084 | getSourceManager().isInSystemHeader(UsingLoc)) | |||
12085 | return nullptr; | |||
12086 | UsingValidatorCCC CCC(HasTypenameKeyword, IsInstantiation, SS.getScopeRep(), | |||
12087 | dyn_cast<CXXRecordDecl>(CurContext)); | |||
12088 | if (TypoCorrection Corrected = | |||
12089 | CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, CCC, | |||
12090 | CTK_ErrorRecovery)) { | |||
12091 | // We reject candidates where DroppedSpecifier == true, hence the | |||
12092 | // literal '0' below. | |||
12093 | diagnoseTypo(Corrected, PDiag(diag::err_no_member_suggest) | |||
12094 | << NameInfo.getName() << LookupContext << 0 | |||
12095 | << SS.getRange()); | |||
12096 | ||||
12097 | // If we picked a correction with no attached Decl we can't do anything | |||
12098 | // useful with it, bail out. | |||
12099 | NamedDecl *ND = Corrected.getCorrectionDecl(); | |||
12100 | if (!ND) | |||
12101 | return BuildInvalid(); | |||
12102 | ||||
12103 | // If we corrected to an inheriting constructor, handle it as one. | |||
12104 | auto *RD = dyn_cast<CXXRecordDecl>(ND); | |||
12105 | if (RD && RD->isInjectedClassName()) { | |||
12106 | // The parent of the injected class name is the class itself. | |||
12107 | RD = cast<CXXRecordDecl>(RD->getParent()); | |||
12108 | ||||
12109 | // Fix up the information we'll use to build the using declaration. | |||
12110 | if (Corrected.WillReplaceSpecifier()) { | |||
12111 | NestedNameSpecifierLocBuilder Builder; | |||
12112 | Builder.MakeTrivial(Context, Corrected.getCorrectionSpecifier(), | |||
12113 | QualifierLoc.getSourceRange()); | |||
12114 | QualifierLoc = Builder.getWithLocInContext(Context); | |||
12115 | } | |||
12116 | ||||
12117 | // In this case, the name we introduce is the name of a derived class | |||
12118 | // constructor. | |||
12119 | auto *CurClass = cast<CXXRecordDecl>(CurContext); | |||
12120 | UsingName.setName(Context.DeclarationNames.getCXXConstructorName( | |||
12121 | Context.getCanonicalType(Context.getRecordType(CurClass)))); | |||
12122 | UsingName.setNamedTypeInfo(nullptr); | |||
12123 | for (auto *Ctor : LookupConstructors(RD)) | |||
12124 | R.addDecl(Ctor); | |||
12125 | R.resolveKind(); | |||
12126 | } else { | |||
12127 | // FIXME: Pick up all the declarations if we found an overloaded | |||
12128 | // function. | |||
12129 | UsingName.setName(ND->getDeclName()); | |||
12130 | R.addDecl(ND); | |||
12131 | } | |||
12132 | } else { | |||
12133 | Diag(IdentLoc, diag::err_no_member) | |||
12134 | << NameInfo.getName() << LookupContext << SS.getRange(); | |||
12135 | return BuildInvalid(); | |||
12136 | } | |||
12137 | } | |||
12138 | ||||
12139 | if (R.isAmbiguous()) | |||
12140 | return BuildInvalid(); | |||
12141 | ||||
12142 | if (HasTypenameKeyword) { | |||
12143 | // If we asked for a typename and got a non-type decl, error out. | |||
12144 | if (!R.getAsSingle<TypeDecl>()) { | |||
12145 | Diag(IdentLoc, diag::err_using_typename_non_type); | |||
12146 | for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) | |||
12147 | Diag((*I)->getUnderlyingDecl()->getLocation(), | |||
12148 | diag::note_using_decl_target); | |||
12149 | return BuildInvalid(); | |||
12150 | } | |||
12151 | } else { | |||
12152 | // If we asked for a non-typename and we got a type, error out, | |||
12153 | // but only if this is an instantiation of an unresolved using | |||
12154 | // decl. Otherwise just silently find the type name. | |||
12155 | if (IsInstantiation && R.getAsSingle<TypeDecl>()) { | |||
12156 | Diag(IdentLoc, diag::err_using_dependent_value_is_type); | |||
12157 | Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); | |||
12158 | return BuildInvalid(); | |||
12159 | } | |||
12160 | } | |||
12161 | ||||
12162 | // C++14 [namespace.udecl]p6: | |||
12163 | // A using-declaration shall not name a namespace. | |||
12164 | if (R.getAsSingle<NamespaceDecl>()) { | |||
12165 | Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) | |||
12166 | << SS.getRange(); | |||
12167 | return BuildInvalid(); | |||
12168 | } | |||
12169 | ||||
12170 | // C++14 [namespace.udecl]p7: | |||
12171 | // A using-declaration shall not name a scoped enumerator. | |||
12172 | if (auto *ED = R.getAsSingle<EnumConstantDecl>()) { | |||
12173 | if (cast<EnumDecl>(ED->getDeclContext())->isScoped()) { | |||
12174 | Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_scoped_enum) | |||
12175 | << SS.getRange(); | |||
12176 | return BuildInvalid(); | |||
12177 | } | |||
12178 | } | |||
12179 | ||||
12180 | UsingDecl *UD = BuildValid(); | |||
12181 | ||||
12182 | // Some additional rules apply to inheriting constructors. | |||
12183 | if (UsingName.getName().getNameKind() == | |||
12184 | DeclarationName::CXXConstructorName) { | |||
12185 | // Suppress access diagnostics; the access check is instead performed at the | |||
12186 | // point of use for an inheriting constructor. | |||
12187 | R.suppressDiagnostics(); | |||
12188 | if (CheckInheritingConstructorUsingDecl(UD)) | |||
12189 | return UD; | |||
12190 | } | |||
12191 | ||||
12192 | for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { | |||
12193 | UsingShadowDecl *PrevDecl = nullptr; | |||
12194 | if (!CheckUsingShadowDecl(UD, *I, Previous, PrevDecl)) | |||
12195 | BuildUsingShadowDecl(S, UD, *I, PrevDecl); | |||
12196 | } | |||
12197 | ||||
12198 | return UD; | |||
12199 | } | |||
12200 | ||||
12201 | NamedDecl *Sema::BuildUsingPackDecl(NamedDecl *InstantiatedFrom, | |||
12202 | ArrayRef<NamedDecl *> Expansions) { | |||
12203 | assert(isa<UnresolvedUsingValueDecl>(InstantiatedFrom) ||((isa<UnresolvedUsingValueDecl>(InstantiatedFrom) || isa <UnresolvedUsingTypenameDecl>(InstantiatedFrom) || isa< UsingPackDecl>(InstantiatedFrom)) ? static_cast<void> (0) : __assert_fail ("isa<UnresolvedUsingValueDecl>(InstantiatedFrom) || isa<UnresolvedUsingTypenameDecl>(InstantiatedFrom) || isa<UsingPackDecl>(InstantiatedFrom)" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 12205, __PRETTY_FUNCTION__)) | |||
12204 | isa<UnresolvedUsingTypenameDecl>(InstantiatedFrom) ||((isa<UnresolvedUsingValueDecl>(InstantiatedFrom) || isa <UnresolvedUsingTypenameDecl>(InstantiatedFrom) || isa< UsingPackDecl>(InstantiatedFrom)) ? static_cast<void> (0) : __assert_fail ("isa<UnresolvedUsingValueDecl>(InstantiatedFrom) || isa<UnresolvedUsingTypenameDecl>(InstantiatedFrom) || isa<UsingPackDecl>(InstantiatedFrom)" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 12205, __PRETTY_FUNCTION__)) | |||
12205 | isa<UsingPackDecl>(InstantiatedFrom))((isa<UnresolvedUsingValueDecl>(InstantiatedFrom) || isa <UnresolvedUsingTypenameDecl>(InstantiatedFrom) || isa< UsingPackDecl>(InstantiatedFrom)) ? static_cast<void> (0) : __assert_fail ("isa<UnresolvedUsingValueDecl>(InstantiatedFrom) || isa<UnresolvedUsingTypenameDecl>(InstantiatedFrom) || isa<UsingPackDecl>(InstantiatedFrom)" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 12205, __PRETTY_FUNCTION__)); | |||
12206 | ||||
12207 | auto *UPD = | |||
12208 | UsingPackDecl::Create(Context, CurContext, InstantiatedFrom, Expansions); | |||
12209 | UPD->setAccess(InstantiatedFrom->getAccess()); | |||
12210 | CurContext->addDecl(UPD); | |||
12211 | return UPD; | |||
12212 | } | |||
12213 | ||||
12214 | /// Additional checks for a using declaration referring to a constructor name. | |||
12215 | bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { | |||
12216 | assert(!UD->hasTypename() && "expecting a constructor name")((!UD->hasTypename() && "expecting a constructor name" ) ? static_cast<void> (0) : __assert_fail ("!UD->hasTypename() && \"expecting a constructor name\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 12216, __PRETTY_FUNCTION__)); | |||
12217 | ||||
12218 | const Type *SourceType = UD->getQualifier()->getAsType(); | |||
12219 | assert(SourceType &&((SourceType && "Using decl naming constructor doesn't have type in scope spec." ) ? static_cast<void> (0) : __assert_fail ("SourceType && \"Using decl naming constructor doesn't have type in scope spec.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 12220, __PRETTY_FUNCTION__)) | |||
12220 | "Using decl naming constructor doesn't have type in scope spec.")((SourceType && "Using decl naming constructor doesn't have type in scope spec." ) ? static_cast<void> (0) : __assert_fail ("SourceType && \"Using decl naming constructor doesn't have type in scope spec.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 12220, __PRETTY_FUNCTION__)); | |||
12221 | CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); | |||
12222 | ||||
12223 | // Check whether the named type is a direct base class. | |||
12224 | bool AnyDependentBases = false; | |||
12225 | auto *Base = findDirectBaseWithType(TargetClass, QualType(SourceType, 0), | |||
12226 | AnyDependentBases); | |||
12227 | if (!Base && !AnyDependentBases) { | |||
12228 | Diag(UD->getUsingLoc(), | |||
12229 | diag::err_using_decl_constructor_not_in_direct_base) | |||
12230 | << UD->getNameInfo().getSourceRange() | |||
12231 | << QualType(SourceType, 0) << TargetClass; | |||
12232 | UD->setInvalidDecl(); | |||
12233 | return true; | |||
12234 | } | |||
12235 | ||||
12236 | if (Base) | |||
12237 | Base->setInheritConstructors(); | |||
12238 | ||||
12239 | return false; | |||
12240 | } | |||
12241 | ||||
12242 | /// Checks that the given using declaration is not an invalid | |||
12243 | /// redeclaration. Note that this is checking only for the using decl | |||
12244 | /// itself, not for any ill-formedness among the UsingShadowDecls. | |||
12245 | bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, | |||
12246 | bool HasTypenameKeyword, | |||
12247 | const CXXScopeSpec &SS, | |||
12248 | SourceLocation NameLoc, | |||
12249 | const LookupResult &Prev) { | |||
12250 | NestedNameSpecifier *Qual = SS.getScopeRep(); | |||
12251 | ||||
12252 | // C++03 [namespace.udecl]p8: | |||
12253 | // C++0x [namespace.udecl]p10: | |||
12254 | // A using-declaration is a declaration and can therefore be used | |||
12255 | // repeatedly where (and only where) multiple declarations are | |||
12256 | // allowed. | |||
12257 | // | |||
12258 | // That's in non-member contexts. | |||
12259 | if (!CurContext->getRedeclContext()->isRecord()) { | |||
12260 | // A dependent qualifier outside a class can only ever resolve to an | |||
12261 | // enumeration type. Therefore it conflicts with any other non-type | |||
12262 | // declaration in the same scope. | |||
12263 | // FIXME: How should we check for dependent type-type conflicts at block | |||
12264 | // scope? | |||
12265 | if (Qual->isDependent() && !HasTypenameKeyword) { | |||
12266 | for (auto *D : Prev) { | |||
12267 | if (!isa<TypeDecl>(D) && !isa<UsingDecl>(D) && !isa<UsingPackDecl>(D)) { | |||
12268 | bool OldCouldBeEnumerator = | |||
12269 | isa<UnresolvedUsingValueDecl>(D) || isa<EnumConstantDecl>(D); | |||
12270 | Diag(NameLoc, | |||
12271 | OldCouldBeEnumerator ? diag::err_redefinition | |||
12272 | : diag::err_redefinition_different_kind) | |||
12273 | << Prev.getLookupName(); | |||
12274 | Diag(D->getLocation(), diag::note_previous_definition); | |||
12275 | return true; | |||
12276 | } | |||
12277 | } | |||
12278 | } | |||
12279 | return false; | |||
12280 | } | |||
12281 | ||||
12282 | for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { | |||
12283 | NamedDecl *D = *I; | |||
12284 | ||||
12285 | bool DTypename; | |||
12286 | NestedNameSpecifier *DQual; | |||
12287 | if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { | |||
12288 | DTypename = UD->hasTypename(); | |||
12289 | DQual = UD->getQualifier(); | |||
12290 | } else if (UnresolvedUsingValueDecl *UD | |||
12291 | = dyn_cast<UnresolvedUsingValueDecl>(D)) { | |||
12292 | DTypename = false; | |||
12293 | DQual = UD->getQualifier(); | |||
12294 | } else if (UnresolvedUsingTypenameDecl *UD | |||
12295 | = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { | |||
12296 | DTypename = true; | |||
12297 | DQual = UD->getQualifier(); | |||
12298 | } else continue; | |||
12299 | ||||
12300 | // using decls differ if one says 'typename' and the other doesn't. | |||
12301 | // FIXME: non-dependent using decls? | |||
12302 | if (HasTypenameKeyword != DTypename) continue; | |||
12303 | ||||
12304 | // using decls differ if they name different scopes (but note that | |||
12305 | // template instantiation can cause this check to trigger when it | |||
12306 | // didn't before instantiation). | |||
12307 | if (Context.getCanonicalNestedNameSpecifier(Qual) != | |||
12308 | Context.getCanonicalNestedNameSpecifier(DQual)) | |||
12309 | continue; | |||
12310 | ||||
12311 | Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); | |||
12312 | Diag(D->getLocation(), diag::note_using_decl) << 1; | |||
12313 | return true; | |||
12314 | } | |||
12315 | ||||
12316 | return false; | |||
12317 | } | |||
12318 | ||||
12319 | ||||
12320 | /// Checks that the given nested-name qualifier used in a using decl | |||
12321 | /// in the current context is appropriately related to the current | |||
12322 | /// scope. If an error is found, diagnoses it and returns true. | |||
12323 | bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, | |||
12324 | bool HasTypename, | |||
12325 | const CXXScopeSpec &SS, | |||
12326 | const DeclarationNameInfo &NameInfo, | |||
12327 | SourceLocation NameLoc) { | |||
12328 | DeclContext *NamedContext = computeDeclContext(SS); | |||
12329 | ||||
12330 | if (!CurContext->isRecord()) { | |||
12331 | // C++03 [namespace.udecl]p3: | |||
12332 | // C++0x [namespace.udecl]p8: | |||
12333 | // A using-declaration for a class member shall be a member-declaration. | |||
12334 | ||||
12335 | // If we weren't able to compute a valid scope, it might validly be a | |||
12336 | // dependent class scope or a dependent enumeration unscoped scope. If | |||
12337 | // we have a 'typename' keyword, the scope must resolve to a class type. | |||
12338 | if ((HasTypename && !NamedContext) || | |||
12339 | (NamedContext && NamedContext->getRedeclContext()->isRecord())) { | |||
12340 | auto *RD = NamedContext | |||
12341 | ? cast<CXXRecordDecl>(NamedContext->getRedeclContext()) | |||
12342 | : nullptr; | |||
12343 | if (RD && RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), RD)) | |||
12344 | RD = nullptr; | |||
12345 | ||||
12346 | Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) | |||
12347 | << SS.getRange(); | |||
12348 | ||||
12349 | // If we have a complete, non-dependent source type, try to suggest a | |||
12350 | // way to get the same effect. | |||
12351 | if (!RD) | |||
12352 | return true; | |||
12353 | ||||
12354 | // Find what this using-declaration was referring to. | |||
12355 | LookupResult R(*this, NameInfo, LookupOrdinaryName); | |||
12356 | R.setHideTags(false); | |||
12357 | R.suppressDiagnostics(); | |||
12358 | LookupQualifiedName(R, RD); | |||
12359 | ||||
12360 | if (R.getAsSingle<TypeDecl>()) { | |||
12361 | if (getLangOpts().CPlusPlus11) { | |||
12362 | // Convert 'using X::Y;' to 'using Y = X::Y;'. | |||
12363 | Diag(SS.getBeginLoc(), diag::note_using_decl_class_member_workaround) | |||
12364 | << 0 // alias declaration | |||
12365 | << FixItHint::CreateInsertion(SS.getBeginLoc(), | |||
12366 | NameInfo.getName().getAsString() + | |||
12367 | " = "); | |||
12368 | } else { | |||
12369 | // Convert 'using X::Y;' to 'typedef X::Y Y;'. | |||
12370 | SourceLocation InsertLoc = getLocForEndOfToken(NameInfo.getEndLoc()); | |||
12371 | Diag(InsertLoc, diag::note_using_decl_class_member_workaround) | |||
12372 | << 1 // typedef declaration | |||
12373 | << FixItHint::CreateReplacement(UsingLoc, "typedef") | |||
12374 | << FixItHint::CreateInsertion( | |||
12375 | InsertLoc, " " + NameInfo.getName().getAsString()); | |||
12376 | } | |||
12377 | } else if (R.getAsSingle<VarDecl>()) { | |||
12378 | // Don't provide a fixit outside C++11 mode; we don't want to suggest | |||
12379 | // repeating the type of the static data member here. | |||
12380 | FixItHint FixIt; | |||
12381 | if (getLangOpts().CPlusPlus11) { | |||
12382 | // Convert 'using X::Y;' to 'auto &Y = X::Y;'. | |||
12383 | FixIt = FixItHint::CreateReplacement( | |||
12384 | UsingLoc, "auto &" + NameInfo.getName().getAsString() + " = "); | |||
12385 | } | |||
12386 | ||||
12387 | Diag(UsingLoc, diag::note_using_decl_class_member_workaround) | |||
12388 | << 2 // reference declaration | |||
12389 | << FixIt; | |||
12390 | } else if (R.getAsSingle<EnumConstantDecl>()) { | |||
12391 | // Don't provide a fixit outside C++11 mode; we don't want to suggest | |||
12392 | // repeating the type of the enumeration here, and we can't do so if | |||
12393 | // the type is anonymous. | |||
12394 | FixItHint FixIt; | |||
12395 | if (getLangOpts().CPlusPlus11) { | |||
12396 | // Convert 'using X::Y;' to 'auto &Y = X::Y;'. | |||
12397 | FixIt = FixItHint::CreateReplacement( | |||
12398 | UsingLoc, | |||
12399 | "constexpr auto " + NameInfo.getName().getAsString() + " = "); | |||
12400 | } | |||
12401 | ||||
12402 | Diag(UsingLoc, diag::note_using_decl_class_member_workaround) | |||
12403 | << (getLangOpts().CPlusPlus11 ? 4 : 3) // const[expr] variable | |||
12404 | << FixIt; | |||
12405 | } | |||
12406 | return true; | |||
12407 | } | |||
12408 | ||||
12409 | // Otherwise, this might be valid. | |||
12410 | return false; | |||
12411 | } | |||
12412 | ||||
12413 | // The current scope is a record. | |||
12414 | ||||
12415 | // If the named context is dependent, we can't decide much. | |||
12416 | if (!NamedContext) { | |||
12417 | // FIXME: in C++0x, we can diagnose if we can prove that the | |||
12418 | // nested-name-specifier does not refer to a base class, which is | |||
12419 | // still possible in some cases. | |||
12420 | ||||
12421 | // Otherwise we have to conservatively report that things might be | |||
12422 | // okay. | |||
12423 | return false; | |||
12424 | } | |||
12425 | ||||
12426 | if (!NamedContext->isRecord()) { | |||
12427 | // Ideally this would point at the last name in the specifier, | |||
12428 | // but we don't have that level of source info. | |||
12429 | Diag(SS.getRange().getBegin(), | |||
12430 | diag::err_using_decl_nested_name_specifier_is_not_class) | |||
12431 | << SS.getScopeRep() << SS.getRange(); | |||
12432 | return true; | |||
12433 | } | |||
12434 | ||||
12435 | if (!NamedContext->isDependentContext() && | |||
12436 | RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) | |||
12437 | return true; | |||
12438 | ||||
12439 | if (getLangOpts().CPlusPlus11) { | |||
12440 | // C++11 [namespace.udecl]p3: | |||
12441 | // In a using-declaration used as a member-declaration, the | |||
12442 | // nested-name-specifier shall name a base class of the class | |||
12443 | // being defined. | |||
12444 | ||||
12445 | if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( | |||
12446 | cast<CXXRecordDecl>(NamedContext))) { | |||
12447 | if (CurContext == NamedContext) { | |||
12448 | Diag(NameLoc, | |||
12449 | diag::err_using_decl_nested_name_specifier_is_current_class) | |||
12450 | << SS.getRange(); | |||
12451 | return true; | |||
12452 | } | |||
12453 | ||||
12454 | if (!cast<CXXRecordDecl>(NamedContext)->isInvalidDecl()) { | |||
12455 | Diag(SS.getRange().getBegin(), | |||
12456 | diag::err_using_decl_nested_name_specifier_is_not_base_class) | |||
12457 | << SS.getScopeRep() | |||
12458 | << cast<CXXRecordDecl>(CurContext) | |||
12459 | << SS.getRange(); | |||
12460 | } | |||
12461 | return true; | |||
12462 | } | |||
12463 | ||||
12464 | return false; | |||
12465 | } | |||
12466 | ||||
12467 | // C++03 [namespace.udecl]p4: | |||
12468 | // A using-declaration used as a member-declaration shall refer | |||
12469 | // to a member of a base class of the class being defined [etc.]. | |||
12470 | ||||
12471 | // Salient point: SS doesn't have to name a base class as long as | |||
12472 | // lookup only finds members from base classes. Therefore we can | |||
12473 | // diagnose here only if we can prove that that can't happen, | |||
12474 | // i.e. if the class hierarchies provably don't intersect. | |||
12475 | ||||
12476 | // TODO: it would be nice if "definitely valid" results were cached | |||
12477 | // in the UsingDecl and UsingShadowDecl so that these checks didn't | |||
12478 | // need to be repeated. | |||
12479 | ||||
12480 | llvm::SmallPtrSet<const CXXRecordDecl *, 4> Bases; | |||
12481 | auto Collect = [&Bases](const CXXRecordDecl *Base) { | |||
12482 | Bases.insert(Base); | |||
12483 | return true; | |||
12484 | }; | |||
12485 | ||||
12486 | // Collect all bases. Return false if we find a dependent base. | |||
12487 | if (!cast<CXXRecordDecl>(CurContext)->forallBases(Collect)) | |||
12488 | return false; | |||
12489 | ||||
12490 | // Returns true if the base is dependent or is one of the accumulated base | |||
12491 | // classes. | |||
12492 | auto IsNotBase = [&Bases](const CXXRecordDecl *Base) { | |||
12493 | return !Bases.count(Base); | |||
12494 | }; | |||
12495 | ||||
12496 | // Return false if the class has a dependent base or if it or one | |||
12497 | // of its bases is present in the base set of the current context. | |||
12498 | if (Bases.count(cast<CXXRecordDecl>(NamedContext)) || | |||
12499 | !cast<CXXRecordDecl>(NamedContext)->forallBases(IsNotBase)) | |||
12500 | return false; | |||
12501 | ||||
12502 | Diag(SS.getRange().getBegin(), | |||
12503 | diag::err_using_decl_nested_name_specifier_is_not_base_class) | |||
12504 | << SS.getScopeRep() | |||
12505 | << cast<CXXRecordDecl>(CurContext) | |||
12506 | << SS.getRange(); | |||
12507 | ||||
12508 | return true; | |||
12509 | } | |||
12510 | ||||
12511 | Decl *Sema::ActOnAliasDeclaration(Scope *S, AccessSpecifier AS, | |||
12512 | MultiTemplateParamsArg TemplateParamLists, | |||
12513 | SourceLocation UsingLoc, UnqualifiedId &Name, | |||
12514 | const ParsedAttributesView &AttrList, | |||
12515 | TypeResult Type, Decl *DeclFromDeclSpec) { | |||
12516 | // Skip up to the relevant declaration scope. | |||
12517 | while (S->isTemplateParamScope()) | |||
12518 | S = S->getParent(); | |||
12519 | assert((S->getFlags() & Scope::DeclScope) &&(((S->getFlags() & Scope::DeclScope) && "got alias-declaration outside of declaration scope" ) ? static_cast<void> (0) : __assert_fail ("(S->getFlags() & Scope::DeclScope) && \"got alias-declaration outside of declaration scope\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 12520, __PRETTY_FUNCTION__)) | |||
12520 | "got alias-declaration outside of declaration scope")(((S->getFlags() & Scope::DeclScope) && "got alias-declaration outside of declaration scope" ) ? static_cast<void> (0) : __assert_fail ("(S->getFlags() & Scope::DeclScope) && \"got alias-declaration outside of declaration scope\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 12520, __PRETTY_FUNCTION__)); | |||
12521 | ||||
12522 | if (Type.isInvalid()) | |||
12523 | return nullptr; | |||
12524 | ||||
12525 | bool Invalid = false; | |||
12526 | DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); | |||
12527 | TypeSourceInfo *TInfo = nullptr; | |||
12528 | GetTypeFromParser(Type.get(), &TInfo); | |||
12529 | ||||
12530 | if (DiagnoseClassNameShadow(CurContext, NameInfo)) | |||
12531 | return nullptr; | |||
12532 | ||||
12533 | if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, | |||
12534 | UPPC_DeclarationType)) { | |||
12535 | Invalid = true; | |||
12536 | TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, | |||
12537 | TInfo->getTypeLoc().getBeginLoc()); | |||
12538 | } | |||
12539 | ||||
12540 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, | |||
12541 | TemplateParamLists.size() | |||
12542 | ? forRedeclarationInCurContext() | |||
12543 | : ForVisibleRedeclaration); | |||
12544 | LookupName(Previous, S); | |||
12545 | ||||
12546 | // Warn about shadowing the name of a template parameter. | |||
12547 | if (Previous.isSingleResult() && | |||
12548 | Previous.getFoundDecl()->isTemplateParameter()) { | |||
12549 | DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); | |||
12550 | Previous.clear(); | |||
12551 | } | |||
12552 | ||||
12553 | assert(Name.Kind == UnqualifiedIdKind::IK_Identifier &&((Name.Kind == UnqualifiedIdKind::IK_Identifier && "name in alias declaration must be an identifier" ) ? static_cast<void> (0) : __assert_fail ("Name.Kind == UnqualifiedIdKind::IK_Identifier && \"name in alias declaration must be an identifier\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 12554, __PRETTY_FUNCTION__)) | |||
12554 | "name in alias declaration must be an identifier")((Name.Kind == UnqualifiedIdKind::IK_Identifier && "name in alias declaration must be an identifier" ) ? static_cast<void> (0) : __assert_fail ("Name.Kind == UnqualifiedIdKind::IK_Identifier && \"name in alias declaration must be an identifier\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 12554, __PRETTY_FUNCTION__)); | |||
12555 | TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, | |||
12556 | Name.StartLocation, | |||
12557 | Name.Identifier, TInfo); | |||
12558 | ||||
12559 | NewTD->setAccess(AS); | |||
12560 | ||||
12561 | if (Invalid) | |||
12562 | NewTD->setInvalidDecl(); | |||
12563 | ||||
12564 | ProcessDeclAttributeList(S, NewTD, AttrList); | |||
12565 | AddPragmaAttributes(S, NewTD); | |||
12566 | ||||
12567 | CheckTypedefForVariablyModifiedType(S, NewTD); | |||
12568 | Invalid |= NewTD->isInvalidDecl(); | |||
12569 | ||||
12570 | bool Redeclaration = false; | |||
12571 | ||||
12572 | NamedDecl *NewND; | |||
12573 | if (TemplateParamLists.size()) { | |||
12574 | TypeAliasTemplateDecl *OldDecl = nullptr; | |||
12575 | TemplateParameterList *OldTemplateParams = nullptr; | |||
12576 | ||||
12577 | if (TemplateParamLists.size() != 1) { | |||
12578 | Diag(UsingLoc, diag::err_alias_template_extra_headers) | |||
12579 | << SourceRange(TemplateParamLists[1]->getTemplateLoc(), | |||
12580 | TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); | |||
12581 | } | |||
12582 | TemplateParameterList *TemplateParams = TemplateParamLists[0]; | |||
12583 | ||||
12584 | // Check that we can declare a template here. | |||
12585 | if (CheckTemplateDeclScope(S, TemplateParams)) | |||
12586 | return nullptr; | |||
12587 | ||||
12588 | // Only consider previous declarations in the same scope. | |||
12589 | FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, | |||
12590 | /*ExplicitInstantiationOrSpecialization*/false); | |||
12591 | if (!Previous.empty()) { | |||
12592 | Redeclaration = true; | |||
12593 | ||||
12594 | OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); | |||
12595 | if (!OldDecl && !Invalid) { | |||
12596 | Diag(UsingLoc, diag::err_redefinition_different_kind) | |||
12597 | << Name.Identifier; | |||
12598 | ||||
12599 | NamedDecl *OldD = Previous.getRepresentativeDecl(); | |||
12600 | if (OldD->getLocation().isValid()) | |||
12601 | Diag(OldD->getLocation(), diag::note_previous_definition); | |||
12602 | ||||
12603 | Invalid = true; | |||
12604 | } | |||
12605 | ||||
12606 | if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { | |||
12607 | if (TemplateParameterListsAreEqual(TemplateParams, | |||
12608 | OldDecl->getTemplateParameters(), | |||
12609 | /*Complain=*/true, | |||
12610 | TPL_TemplateMatch)) | |||
12611 | OldTemplateParams = | |||
12612 | OldDecl->getMostRecentDecl()->getTemplateParameters(); | |||
12613 | else | |||
12614 | Invalid = true; | |||
12615 | ||||
12616 | TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); | |||
12617 | if (!Invalid && | |||
12618 | !Context.hasSameType(OldTD->getUnderlyingType(), | |||
12619 | NewTD->getUnderlyingType())) { | |||
12620 | // FIXME: The C++0x standard does not clearly say this is ill-formed, | |||
12621 | // but we can't reasonably accept it. | |||
12622 | Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) | |||
12623 | << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); | |||
12624 | if (OldTD->getLocation().isValid()) | |||
12625 | Diag(OldTD->getLocation(), diag::note_previous_definition); | |||
12626 | Invalid = true; | |||
12627 | } | |||
12628 | } | |||
12629 | } | |||
12630 | ||||
12631 | // Merge any previous default template arguments into our parameters, | |||
12632 | // and check the parameter list. | |||
12633 | if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, | |||
12634 | TPC_TypeAliasTemplate)) | |||
12635 | return nullptr; | |||
12636 | ||||
12637 | TypeAliasTemplateDecl *NewDecl = | |||
12638 | TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, | |||
12639 | Name.Identifier, TemplateParams, | |||
12640 | NewTD); | |||
12641 | NewTD->setDescribedAliasTemplate(NewDecl); | |||
12642 | ||||
12643 | NewDecl->setAccess(AS); | |||
12644 | ||||
12645 | if (Invalid) | |||
12646 | NewDecl->setInvalidDecl(); | |||
12647 | else if (OldDecl) { | |||
12648 | NewDecl->setPreviousDecl(OldDecl); | |||
12649 | CheckRedeclarationModuleOwnership(NewDecl, OldDecl); | |||
12650 | } | |||
12651 | ||||
12652 | NewND = NewDecl; | |||
12653 | } else { | |||
12654 | if (auto *TD = dyn_cast_or_null<TagDecl>(DeclFromDeclSpec)) { | |||
12655 | setTagNameForLinkagePurposes(TD, NewTD); | |||
12656 | handleTagNumbering(TD, S); | |||
12657 | } | |||
12658 | ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); | |||
12659 | NewND = NewTD; | |||
12660 | } | |||
12661 | ||||
12662 | PushOnScopeChains(NewND, S); | |||
12663 | ActOnDocumentableDecl(NewND); | |||
12664 | return NewND; | |||
12665 | } | |||
12666 | ||||
12667 | Decl *Sema::ActOnNamespaceAliasDef(Scope *S, SourceLocation NamespaceLoc, | |||
12668 | SourceLocation AliasLoc, | |||
12669 | IdentifierInfo *Alias, CXXScopeSpec &SS, | |||
12670 | SourceLocation IdentLoc, | |||
12671 | IdentifierInfo *Ident) { | |||
12672 | ||||
12673 | // Lookup the namespace name. | |||
12674 | LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); | |||
12675 | LookupParsedName(R, S, &SS); | |||
12676 | ||||
12677 | if (R.isAmbiguous()) | |||
12678 | return nullptr; | |||
12679 | ||||
12680 | if (R.empty()) { | |||
12681 | if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { | |||
12682 | Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); | |||
12683 | return nullptr; | |||
12684 | } | |||
12685 | } | |||
12686 | assert(!R.isAmbiguous() && !R.empty())((!R.isAmbiguous() && !R.empty()) ? static_cast<void > (0) : __assert_fail ("!R.isAmbiguous() && !R.empty()" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 12686, __PRETTY_FUNCTION__)); | |||
12687 | NamedDecl *ND = R.getRepresentativeDecl(); | |||
12688 | ||||
12689 | // Check if we have a previous declaration with the same name. | |||
12690 | LookupResult PrevR(*this, Alias, AliasLoc, LookupOrdinaryName, | |||
12691 | ForVisibleRedeclaration); | |||
12692 | LookupName(PrevR, S); | |||
12693 | ||||
12694 | // Check we're not shadowing a template parameter. | |||
12695 | if (PrevR.isSingleResult() && PrevR.getFoundDecl()->isTemplateParameter()) { | |||
12696 | DiagnoseTemplateParameterShadow(AliasLoc, PrevR.getFoundDecl()); | |||
12697 | PrevR.clear(); | |||
12698 | } | |||
12699 | ||||
12700 | // Filter out any other lookup result from an enclosing scope. | |||
12701 | FilterLookupForScope(PrevR, CurContext, S, /*ConsiderLinkage*/false, | |||
12702 | /*AllowInlineNamespace*/false); | |||
12703 | ||||
12704 | // Find the previous declaration and check that we can redeclare it. | |||
12705 | NamespaceAliasDecl *Prev = nullptr; | |||
12706 | if (PrevR.isSingleResult()) { | |||
12707 | NamedDecl *PrevDecl = PrevR.getRepresentativeDecl(); | |||
12708 | if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { | |||
12709 | // We already have an alias with the same name that points to the same | |||
12710 | // namespace; check that it matches. | |||
12711 | if (AD->getNamespace()->Equals(getNamespaceDecl(ND))) { | |||
12712 | Prev = AD; | |||
12713 | } else if (isVisible(PrevDecl)) { | |||
12714 | Diag(AliasLoc, diag::err_redefinition_different_namespace_alias) | |||
12715 | << Alias; | |||
12716 | Diag(AD->getLocation(), diag::note_previous_namespace_alias) | |||
12717 | << AD->getNamespace(); | |||
12718 | return nullptr; | |||
12719 | } | |||
12720 | } else if (isVisible(PrevDecl)) { | |||
12721 | unsigned DiagID = isa<NamespaceDecl>(PrevDecl->getUnderlyingDecl()) | |||
12722 | ? diag::err_redefinition | |||
12723 | : diag::err_redefinition_different_kind; | |||
12724 | Diag(AliasLoc, DiagID) << Alias; | |||
12725 | Diag(PrevDecl->getLocation(), diag::note_previous_definition); | |||
12726 | return nullptr; | |||
12727 | } | |||
12728 | } | |||
12729 | ||||
12730 | // The use of a nested name specifier may trigger deprecation warnings. | |||
12731 | DiagnoseUseOfDecl(ND, IdentLoc); | |||
12732 | ||||
12733 | NamespaceAliasDecl *AliasDecl = | |||
12734 | NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, | |||
12735 | Alias, SS.getWithLocInContext(Context), | |||
12736 | IdentLoc, ND); | |||
12737 | if (Prev) | |||
12738 | AliasDecl->setPreviousDecl(Prev); | |||
12739 | ||||
12740 | PushOnScopeChains(AliasDecl, S); | |||
12741 | return AliasDecl; | |||
12742 | } | |||
12743 | ||||
12744 | namespace { | |||
12745 | struct SpecialMemberExceptionSpecInfo | |||
12746 | : SpecialMemberVisitor<SpecialMemberExceptionSpecInfo> { | |||
12747 | SourceLocation Loc; | |||
12748 | Sema::ImplicitExceptionSpecification ExceptSpec; | |||
12749 | ||||
12750 | SpecialMemberExceptionSpecInfo(Sema &S, CXXMethodDecl *MD, | |||
12751 | Sema::CXXSpecialMember CSM, | |||
12752 | Sema::InheritedConstructorInfo *ICI, | |||
12753 | SourceLocation Loc) | |||
12754 | : SpecialMemberVisitor(S, MD, CSM, ICI), Loc(Loc), ExceptSpec(S) {} | |||
12755 | ||||
12756 | bool visitBase(CXXBaseSpecifier *Base); | |||
12757 | bool visitField(FieldDecl *FD); | |||
12758 | ||||
12759 | void visitClassSubobject(CXXRecordDecl *Class, Subobject Subobj, | |||
12760 | unsigned Quals); | |||
12761 | ||||
12762 | void visitSubobjectCall(Subobject Subobj, | |||
12763 | Sema::SpecialMemberOverloadResult SMOR); | |||
12764 | }; | |||
12765 | } | |||
12766 | ||||
12767 | bool SpecialMemberExceptionSpecInfo::visitBase(CXXBaseSpecifier *Base) { | |||
12768 | auto *RT = Base->getType()->getAs<RecordType>(); | |||
12769 | if (!RT) | |||
12770 | return false; | |||
12771 | ||||
12772 | auto *BaseClass = cast<CXXRecordDecl>(RT->getDecl()); | |||
12773 | Sema::SpecialMemberOverloadResult SMOR = lookupInheritedCtor(BaseClass); | |||
12774 | if (auto *BaseCtor = SMOR.getMethod()) { | |||
12775 | visitSubobjectCall(Base, BaseCtor); | |||
12776 | return false; | |||
12777 | } | |||
12778 | ||||
12779 | visitClassSubobject(BaseClass, Base, 0); | |||
12780 | return false; | |||
12781 | } | |||
12782 | ||||
12783 | bool SpecialMemberExceptionSpecInfo::visitField(FieldDecl *FD) { | |||
12784 | if (CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer()) { | |||
12785 | Expr *E = FD->getInClassInitializer(); | |||
12786 | if (!E) | |||
12787 | // FIXME: It's a little wasteful to build and throw away a | |||
12788 | // CXXDefaultInitExpr here. | |||
12789 | // FIXME: We should have a single context note pointing at Loc, and | |||
12790 | // this location should be MD->getLocation() instead, since that's | |||
12791 | // the location where we actually use the default init expression. | |||
12792 | E = S.BuildCXXDefaultInitExpr(Loc, FD).get(); | |||
12793 | if (E) | |||
12794 | ExceptSpec.CalledExpr(E); | |||
12795 | } else if (auto *RT = S.Context.getBaseElementType(FD->getType()) | |||
12796 | ->getAs<RecordType>()) { | |||
12797 | visitClassSubobject(cast<CXXRecordDecl>(RT->getDecl()), FD, | |||
12798 | FD->getType().getCVRQualifiers()); | |||
12799 | } | |||
12800 | return false; | |||
12801 | } | |||
12802 | ||||
12803 | void SpecialMemberExceptionSpecInfo::visitClassSubobject(CXXRecordDecl *Class, | |||
12804 | Subobject Subobj, | |||
12805 | unsigned Quals) { | |||
12806 | FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); | |||
12807 | bool IsMutable = Field && Field->isMutable(); | |||
12808 | visitSubobjectCall(Subobj, lookupIn(Class, Quals, IsMutable)); | |||
12809 | } | |||
12810 | ||||
12811 | void SpecialMemberExceptionSpecInfo::visitSubobjectCall( | |||
12812 | Subobject Subobj, Sema::SpecialMemberOverloadResult SMOR) { | |||
12813 | // Note, if lookup fails, it doesn't matter what exception specification we | |||
12814 | // choose because the special member will be deleted. | |||
12815 | if (CXXMethodDecl *MD = SMOR.getMethod()) | |||
12816 | ExceptSpec.CalledDecl(getSubobjectLoc(Subobj), MD); | |||
12817 | } | |||
12818 | ||||
12819 | bool Sema::tryResolveExplicitSpecifier(ExplicitSpecifier &ExplicitSpec) { | |||
12820 | llvm::APSInt Result; | |||
12821 | ExprResult Converted = CheckConvertedConstantExpression( | |||
12822 | ExplicitSpec.getExpr(), Context.BoolTy, Result, CCEK_ExplicitBool); | |||
12823 | ExplicitSpec.setExpr(Converted.get()); | |||
12824 | if (Converted.isUsable() && !Converted.get()->isValueDependent()) { | |||
12825 | ExplicitSpec.setKind(Result.getBoolValue() | |||
12826 | ? ExplicitSpecKind::ResolvedTrue | |||
12827 | : ExplicitSpecKind::ResolvedFalse); | |||
12828 | return true; | |||
12829 | } | |||
12830 | ExplicitSpec.setKind(ExplicitSpecKind::Unresolved); | |||
12831 | return false; | |||
12832 | } | |||
12833 | ||||
12834 | ExplicitSpecifier Sema::ActOnExplicitBoolSpecifier(Expr *ExplicitExpr) { | |||
12835 | ExplicitSpecifier ES(ExplicitExpr, ExplicitSpecKind::Unresolved); | |||
12836 | if (!ExplicitExpr->isTypeDependent()) | |||
12837 | tryResolveExplicitSpecifier(ES); | |||
12838 | return ES; | |||
12839 | } | |||
12840 | ||||
12841 | static Sema::ImplicitExceptionSpecification | |||
12842 | ComputeDefaultedSpecialMemberExceptionSpec( | |||
12843 | Sema &S, SourceLocation Loc, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM, | |||
12844 | Sema::InheritedConstructorInfo *ICI) { | |||
12845 | ComputingExceptionSpec CES(S, MD, Loc); | |||
12846 | ||||
12847 | CXXRecordDecl *ClassDecl = MD->getParent(); | |||
12848 | ||||
12849 | // C++ [except.spec]p14: | |||
12850 | // An implicitly declared special member function (Clause 12) shall have an | |||
12851 | // exception-specification. [...] | |||
12852 | SpecialMemberExceptionSpecInfo Info(S, MD, CSM, ICI, MD->getLocation()); | |||
12853 | if (ClassDecl->isInvalidDecl()) | |||
12854 | return Info.ExceptSpec; | |||
12855 | ||||
12856 | // FIXME: If this diagnostic fires, we're probably missing a check for | |||
12857 | // attempting to resolve an exception specification before it's known | |||
12858 | // at a higher level. | |||
12859 | if (S.RequireCompleteType(MD->getLocation(), | |||
12860 | S.Context.getRecordType(ClassDecl), | |||
12861 | diag::err_exception_spec_incomplete_type)) | |||
12862 | return Info.ExceptSpec; | |||
12863 | ||||
12864 | // C++1z [except.spec]p7: | |||
12865 | // [Look for exceptions thrown by] a constructor selected [...] to | |||
12866 | // initialize a potentially constructed subobject, | |||
12867 | // C++1z [except.spec]p8: | |||
12868 | // The exception specification for an implicitly-declared destructor, or a | |||
12869 | // destructor without a noexcept-specifier, is potentially-throwing if and | |||
12870 | // only if any of the destructors for any of its potentially constructed | |||
12871 | // subojects is potentially throwing. | |||
12872 | // FIXME: We respect the first rule but ignore the "potentially constructed" | |||
12873 | // in the second rule to resolve a core issue (no number yet) that would have | |||
12874 | // us reject: | |||
12875 | // struct A { virtual void f() = 0; virtual ~A() noexcept(false) = 0; }; | |||
12876 | // struct B : A {}; | |||
12877 | // struct C : B { void f(); }; | |||
12878 | // ... due to giving B::~B() a non-throwing exception specification. | |||
12879 | Info.visit(Info.IsConstructor ? Info.VisitPotentiallyConstructedBases | |||
12880 | : Info.VisitAllBases); | |||
12881 | ||||
12882 | return Info.ExceptSpec; | |||
12883 | } | |||
12884 | ||||
12885 | namespace { | |||
12886 | /// RAII object to register a special member as being currently declared. | |||
12887 | struct DeclaringSpecialMember { | |||
12888 | Sema &S; | |||
12889 | Sema::SpecialMemberDecl D; | |||
12890 | Sema::ContextRAII SavedContext; | |||
12891 | bool WasAlreadyBeingDeclared; | |||
12892 | ||||
12893 | DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM) | |||
12894 | : S(S), D(RD, CSM), SavedContext(S, RD) { | |||
12895 | WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D).second; | |||
12896 | if (WasAlreadyBeingDeclared) | |||
12897 | // This almost never happens, but if it does, ensure that our cache | |||
12898 | // doesn't contain a stale result. | |||
12899 | S.SpecialMemberCache.clear(); | |||
12900 | else { | |||
12901 | // Register a note to be produced if we encounter an error while | |||
12902 | // declaring the special member. | |||
12903 | Sema::CodeSynthesisContext Ctx; | |||
12904 | Ctx.Kind = Sema::CodeSynthesisContext::DeclaringSpecialMember; | |||
12905 | // FIXME: We don't have a location to use here. Using the class's | |||
12906 | // location maintains the fiction that we declare all special members | |||
12907 | // with the class, but (1) it's not clear that lying about that helps our | |||
12908 | // users understand what's going on, and (2) there may be outer contexts | |||
12909 | // on the stack (some of which are relevant) and printing them exposes | |||
12910 | // our lies. | |||
12911 | Ctx.PointOfInstantiation = RD->getLocation(); | |||
12912 | Ctx.Entity = RD; | |||
12913 | Ctx.SpecialMember = CSM; | |||
12914 | S.pushCodeSynthesisContext(Ctx); | |||
12915 | } | |||
12916 | } | |||
12917 | ~DeclaringSpecialMember() { | |||
12918 | if (!WasAlreadyBeingDeclared) { | |||
12919 | S.SpecialMembersBeingDeclared.erase(D); | |||
12920 | S.popCodeSynthesisContext(); | |||
12921 | } | |||
12922 | } | |||
12923 | ||||
12924 | /// Are we already trying to declare this special member? | |||
12925 | bool isAlreadyBeingDeclared() const { | |||
12926 | return WasAlreadyBeingDeclared; | |||
12927 | } | |||
12928 | }; | |||
12929 | } | |||
12930 | ||||
12931 | void Sema::CheckImplicitSpecialMemberDeclaration(Scope *S, FunctionDecl *FD) { | |||
12932 | // Look up any existing declarations, but don't trigger declaration of all | |||
12933 | // implicit special members with this name. | |||
12934 | DeclarationName Name = FD->getDeclName(); | |||
12935 | LookupResult R(*this, Name, SourceLocation(), LookupOrdinaryName, | |||
12936 | ForExternalRedeclaration); | |||
12937 | for (auto *D : FD->getParent()->lookup(Name)) | |||
12938 | if (auto *Acceptable = R.getAcceptableDecl(D)) | |||
12939 | R.addDecl(Acceptable); | |||
12940 | R.resolveKind(); | |||
12941 | R.suppressDiagnostics(); | |||
12942 | ||||
12943 | CheckFunctionDeclaration(S, FD, R, /*IsMemberSpecialization*/false); | |||
12944 | } | |||
12945 | ||||
12946 | void Sema::setupImplicitSpecialMemberType(CXXMethodDecl *SpecialMem, | |||
12947 | QualType ResultTy, | |||
12948 | ArrayRef<QualType> Args) { | |||
12949 | // Build an exception specification pointing back at this constructor. | |||
12950 | FunctionProtoType::ExtProtoInfo EPI = getImplicitMethodEPI(*this, SpecialMem); | |||
12951 | ||||
12952 | LangAS AS = getDefaultCXXMethodAddrSpace(); | |||
12953 | if (AS != LangAS::Default) { | |||
12954 | EPI.TypeQuals.addAddressSpace(AS); | |||
12955 | } | |||
12956 | ||||
12957 | auto QT = Context.getFunctionType(ResultTy, Args, EPI); | |||
12958 | SpecialMem->setType(QT); | |||
12959 | } | |||
12960 | ||||
12961 | CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( | |||
12962 | CXXRecordDecl *ClassDecl) { | |||
12963 | // C++ [class.ctor]p5: | |||
12964 | // A default constructor for a class X is a constructor of class X | |||
12965 | // that can be called without an argument. If there is no | |||
12966 | // user-declared constructor for class X, a default constructor is | |||
12967 | // implicitly declared. An implicitly-declared default constructor | |||
12968 | // is an inline public member of its class. | |||
12969 | assert(ClassDecl->needsImplicitDefaultConstructor() &&((ClassDecl->needsImplicitDefaultConstructor() && "Should not build implicit default constructor!" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl->needsImplicitDefaultConstructor() && \"Should not build implicit default constructor!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 12970, __PRETTY_FUNCTION__)) | |||
12970 | "Should not build implicit default constructor!")((ClassDecl->needsImplicitDefaultConstructor() && "Should not build implicit default constructor!" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl->needsImplicitDefaultConstructor() && \"Should not build implicit default constructor!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 12970, __PRETTY_FUNCTION__)); | |||
12971 | ||||
12972 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor); | |||
12973 | if (DSM.isAlreadyBeingDeclared()) | |||
12974 | return nullptr; | |||
12975 | ||||
12976 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, | |||
12977 | CXXDefaultConstructor, | |||
12978 | false); | |||
12979 | ||||
12980 | // Create the actual constructor declaration. | |||
12981 | CanQualType ClassType | |||
12982 | = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); | |||
12983 | SourceLocation ClassLoc = ClassDecl->getLocation(); | |||
12984 | DeclarationName Name | |||
12985 | = Context.DeclarationNames.getCXXConstructorName(ClassType); | |||
12986 | DeclarationNameInfo NameInfo(Name, ClassLoc); | |||
12987 | CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( | |||
12988 | Context, ClassDecl, ClassLoc, NameInfo, /*Type*/ QualType(), | |||
12989 | /*TInfo=*/nullptr, ExplicitSpecifier(), | |||
12990 | /*isInline=*/true, /*isImplicitlyDeclared=*/true, | |||
12991 | Constexpr ? ConstexprSpecKind::Constexpr | |||
12992 | : ConstexprSpecKind::Unspecified); | |||
12993 | DefaultCon->setAccess(AS_public); | |||
12994 | DefaultCon->setDefaulted(); | |||
12995 | ||||
12996 | if (getLangOpts().CUDA) { | |||
12997 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXDefaultConstructor, | |||
12998 | DefaultCon, | |||
12999 | /* ConstRHS */ false, | |||
13000 | /* Diagnose */ false); | |||
13001 | } | |||
13002 | ||||
13003 | setupImplicitSpecialMemberType(DefaultCon, Context.VoidTy, None); | |||
13004 | ||||
13005 | // We don't need to use SpecialMemberIsTrivial here; triviality for default | |||
13006 | // constructors is easy to compute. | |||
13007 | DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); | |||
13008 | ||||
13009 | // Note that we have declared this constructor. | |||
13010 | ++getASTContext().NumImplicitDefaultConstructorsDeclared; | |||
13011 | ||||
13012 | Scope *S = getScopeForContext(ClassDecl); | |||
13013 | CheckImplicitSpecialMemberDeclaration(S, DefaultCon); | |||
13014 | ||||
13015 | if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) | |||
13016 | SetDeclDeleted(DefaultCon, ClassLoc); | |||
13017 | ||||
13018 | if (S) | |||
13019 | PushOnScopeChains(DefaultCon, S, false); | |||
13020 | ClassDecl->addDecl(DefaultCon); | |||
13021 | ||||
13022 | return DefaultCon; | |||
13023 | } | |||
13024 | ||||
13025 | void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, | |||
13026 | CXXConstructorDecl *Constructor) { | |||
13027 | assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() &&(((Constructor->isDefaulted() && Constructor->isDefaultConstructor () && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()) && "DefineImplicitDefaultConstructor - call it for implicit default ctor" ) ? static_cast<void> (0) : __assert_fail ("(Constructor->isDefaulted() && Constructor->isDefaultConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()) && \"DefineImplicitDefaultConstructor - call it for implicit default ctor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13030, __PRETTY_FUNCTION__)) | |||
13028 | !Constructor->doesThisDeclarationHaveABody() &&(((Constructor->isDefaulted() && Constructor->isDefaultConstructor () && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()) && "DefineImplicitDefaultConstructor - call it for implicit default ctor" ) ? static_cast<void> (0) : __assert_fail ("(Constructor->isDefaulted() && Constructor->isDefaultConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()) && \"DefineImplicitDefaultConstructor - call it for implicit default ctor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13030, __PRETTY_FUNCTION__)) | |||
13029 | !Constructor->isDeleted()) &&(((Constructor->isDefaulted() && Constructor->isDefaultConstructor () && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()) && "DefineImplicitDefaultConstructor - call it for implicit default ctor" ) ? static_cast<void> (0) : __assert_fail ("(Constructor->isDefaulted() && Constructor->isDefaultConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()) && \"DefineImplicitDefaultConstructor - call it for implicit default ctor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13030, __PRETTY_FUNCTION__)) | |||
13030 | "DefineImplicitDefaultConstructor - call it for implicit default ctor")(((Constructor->isDefaulted() && Constructor->isDefaultConstructor () && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()) && "DefineImplicitDefaultConstructor - call it for implicit default ctor" ) ? static_cast<void> (0) : __assert_fail ("(Constructor->isDefaulted() && Constructor->isDefaultConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()) && \"DefineImplicitDefaultConstructor - call it for implicit default ctor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13030, __PRETTY_FUNCTION__)); | |||
13031 | if (Constructor->willHaveBody() || Constructor->isInvalidDecl()) | |||
13032 | return; | |||
13033 | ||||
13034 | CXXRecordDecl *ClassDecl = Constructor->getParent(); | |||
13035 | assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor")((ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl && \"DefineImplicitDefaultConstructor - invalid constructor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13035, __PRETTY_FUNCTION__)); | |||
13036 | ||||
13037 | SynthesizedFunctionScope Scope(*this, Constructor); | |||
13038 | ||||
13039 | // The exception specification is needed because we are defining the | |||
13040 | // function. | |||
13041 | ResolveExceptionSpec(CurrentLocation, | |||
13042 | Constructor->getType()->castAs<FunctionProtoType>()); | |||
13043 | MarkVTableUsed(CurrentLocation, ClassDecl); | |||
13044 | ||||
13045 | // Add a context note for diagnostics produced after this point. | |||
13046 | Scope.addContextNote(CurrentLocation); | |||
13047 | ||||
13048 | if (SetCtorInitializers(Constructor, /*AnyErrors=*/false)) { | |||
13049 | Constructor->setInvalidDecl(); | |||
13050 | return; | |||
13051 | } | |||
13052 | ||||
13053 | SourceLocation Loc = Constructor->getEndLoc().isValid() | |||
13054 | ? Constructor->getEndLoc() | |||
13055 | : Constructor->getLocation(); | |||
13056 | Constructor->setBody(new (Context) CompoundStmt(Loc)); | |||
13057 | Constructor->markUsed(Context); | |||
13058 | ||||
13059 | if (ASTMutationListener *L = getASTMutationListener()) { | |||
13060 | L->CompletedImplicitDefinition(Constructor); | |||
13061 | } | |||
13062 | ||||
13063 | DiagnoseUninitializedFields(*this, Constructor); | |||
13064 | } | |||
13065 | ||||
13066 | void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { | |||
13067 | // Perform any delayed checks on exception specifications. | |||
13068 | CheckDelayedMemberExceptionSpecs(); | |||
13069 | } | |||
13070 | ||||
13071 | /// Find or create the fake constructor we synthesize to model constructing an | |||
13072 | /// object of a derived class via a constructor of a base class. | |||
13073 | CXXConstructorDecl * | |||
13074 | Sema::findInheritingConstructor(SourceLocation Loc, | |||
13075 | CXXConstructorDecl *BaseCtor, | |||
13076 | ConstructorUsingShadowDecl *Shadow) { | |||
13077 | CXXRecordDecl *Derived = Shadow->getParent(); | |||
13078 | SourceLocation UsingLoc = Shadow->getLocation(); | |||
13079 | ||||
13080 | // FIXME: Add a new kind of DeclarationName for an inherited constructor. | |||
13081 | // For now we use the name of the base class constructor as a member of the | |||
13082 | // derived class to indicate a (fake) inherited constructor name. | |||
13083 | DeclarationName Name = BaseCtor->getDeclName(); | |||
13084 | ||||
13085 | // Check to see if we already have a fake constructor for this inherited | |||
13086 | // constructor call. | |||
13087 | for (NamedDecl *Ctor : Derived->lookup(Name)) | |||
13088 | if (declaresSameEntity(cast<CXXConstructorDecl>(Ctor) | |||
13089 | ->getInheritedConstructor() | |||
13090 | .getConstructor(), | |||
13091 | BaseCtor)) | |||
13092 | return cast<CXXConstructorDecl>(Ctor); | |||
13093 | ||||
13094 | DeclarationNameInfo NameInfo(Name, UsingLoc); | |||
13095 | TypeSourceInfo *TInfo = | |||
13096 | Context.getTrivialTypeSourceInfo(BaseCtor->getType(), UsingLoc); | |||
13097 | FunctionProtoTypeLoc ProtoLoc = | |||
13098 | TInfo->getTypeLoc().IgnoreParens().castAs<FunctionProtoTypeLoc>(); | |||
13099 | ||||
13100 | // Check the inherited constructor is valid and find the list of base classes | |||
13101 | // from which it was inherited. | |||
13102 | InheritedConstructorInfo ICI(*this, Loc, Shadow); | |||
13103 | ||||
13104 | bool Constexpr = | |||
13105 | BaseCtor->isConstexpr() && | |||
13106 | defaultedSpecialMemberIsConstexpr(*this, Derived, CXXDefaultConstructor, | |||
13107 | false, BaseCtor, &ICI); | |||
13108 | ||||
13109 | CXXConstructorDecl *DerivedCtor = CXXConstructorDecl::Create( | |||
13110 | Context, Derived, UsingLoc, NameInfo, TInfo->getType(), TInfo, | |||
13111 | BaseCtor->getExplicitSpecifier(), /*isInline=*/true, | |||
13112 | /*isImplicitlyDeclared=*/true, | |||
13113 | Constexpr ? BaseCtor->getConstexprKind() : ConstexprSpecKind::Unspecified, | |||
13114 | InheritedConstructor(Shadow, BaseCtor), | |||
13115 | BaseCtor->getTrailingRequiresClause()); | |||
13116 | if (Shadow->isInvalidDecl()) | |||
13117 | DerivedCtor->setInvalidDecl(); | |||
13118 | ||||
13119 | // Build an unevaluated exception specification for this fake constructor. | |||
13120 | const FunctionProtoType *FPT = TInfo->getType()->castAs<FunctionProtoType>(); | |||
13121 | FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); | |||
13122 | EPI.ExceptionSpec.Type = EST_Unevaluated; | |||
13123 | EPI.ExceptionSpec.SourceDecl = DerivedCtor; | |||
13124 | DerivedCtor->setType(Context.getFunctionType(FPT->getReturnType(), | |||
13125 | FPT->getParamTypes(), EPI)); | |||
13126 | ||||
13127 | // Build the parameter declarations. | |||
13128 | SmallVector<ParmVarDecl *, 16> ParamDecls; | |||
13129 | for (unsigned I = 0, N = FPT->getNumParams(); I != N; ++I) { | |||
13130 | TypeSourceInfo *TInfo = | |||
13131 | Context.getTrivialTypeSourceInfo(FPT->getParamType(I), UsingLoc); | |||
13132 | ParmVarDecl *PD = ParmVarDecl::Create( | |||
13133 | Context, DerivedCtor, UsingLoc, UsingLoc, /*IdentifierInfo=*/nullptr, | |||
13134 | FPT->getParamType(I), TInfo, SC_None, /*DefArg=*/nullptr); | |||
13135 | PD->setScopeInfo(0, I); | |||
13136 | PD->setImplicit(); | |||
13137 | // Ensure attributes are propagated onto parameters (this matters for | |||
13138 | // format, pass_object_size, ...). | |||
13139 | mergeDeclAttributes(PD, BaseCtor->getParamDecl(I)); | |||
13140 | ParamDecls.push_back(PD); | |||
13141 | ProtoLoc.setParam(I, PD); | |||
13142 | } | |||
13143 | ||||
13144 | // Set up the new constructor. | |||
13145 | assert(!BaseCtor->isDeleted() && "should not use deleted constructor")((!BaseCtor->isDeleted() && "should not use deleted constructor" ) ? static_cast<void> (0) : __assert_fail ("!BaseCtor->isDeleted() && \"should not use deleted constructor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13145, __PRETTY_FUNCTION__)); | |||
13146 | DerivedCtor->setAccess(BaseCtor->getAccess()); | |||
13147 | DerivedCtor->setParams(ParamDecls); | |||
13148 | Derived->addDecl(DerivedCtor); | |||
13149 | ||||
13150 | if (ShouldDeleteSpecialMember(DerivedCtor, CXXDefaultConstructor, &ICI)) | |||
13151 | SetDeclDeleted(DerivedCtor, UsingLoc); | |||
13152 | ||||
13153 | return DerivedCtor; | |||
13154 | } | |||
13155 | ||||
13156 | void Sema::NoteDeletedInheritingConstructor(CXXConstructorDecl *Ctor) { | |||
13157 | InheritedConstructorInfo ICI(*this, Ctor->getLocation(), | |||
13158 | Ctor->getInheritedConstructor().getShadowDecl()); | |||
13159 | ShouldDeleteSpecialMember(Ctor, CXXDefaultConstructor, &ICI, | |||
13160 | /*Diagnose*/true); | |||
13161 | } | |||
13162 | ||||
13163 | void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation, | |||
13164 | CXXConstructorDecl *Constructor) { | |||
13165 | CXXRecordDecl *ClassDecl = Constructor->getParent(); | |||
13166 | assert(Constructor->getInheritedConstructor() &&((Constructor->getInheritedConstructor() && !Constructor ->doesThisDeclarationHaveABody() && !Constructor-> isDeleted()) ? static_cast<void> (0) : __assert_fail ("Constructor->getInheritedConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13168, __PRETTY_FUNCTION__)) | |||
13167 | !Constructor->doesThisDeclarationHaveABody() &&((Constructor->getInheritedConstructor() && !Constructor ->doesThisDeclarationHaveABody() && !Constructor-> isDeleted()) ? static_cast<void> (0) : __assert_fail ("Constructor->getInheritedConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13168, __PRETTY_FUNCTION__)) | |||
13168 | !Constructor->isDeleted())((Constructor->getInheritedConstructor() && !Constructor ->doesThisDeclarationHaveABody() && !Constructor-> isDeleted()) ? static_cast<void> (0) : __assert_fail ("Constructor->getInheritedConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13168, __PRETTY_FUNCTION__)); | |||
13169 | if (Constructor->willHaveBody() || Constructor->isInvalidDecl()) | |||
13170 | return; | |||
13171 | ||||
13172 | // Initializations are performed "as if by a defaulted default constructor", | |||
13173 | // so enter the appropriate scope. | |||
13174 | SynthesizedFunctionScope Scope(*this, Constructor); | |||
13175 | ||||
13176 | // The exception specification is needed because we are defining the | |||
13177 | // function. | |||
13178 | ResolveExceptionSpec(CurrentLocation, | |||
13179 | Constructor->getType()->castAs<FunctionProtoType>()); | |||
13180 | MarkVTableUsed(CurrentLocation, ClassDecl); | |||
13181 | ||||
13182 | // Add a context note for diagnostics produced after this point. | |||
13183 | Scope.addContextNote(CurrentLocation); | |||
13184 | ||||
13185 | ConstructorUsingShadowDecl *Shadow = | |||
13186 | Constructor->getInheritedConstructor().getShadowDecl(); | |||
13187 | CXXConstructorDecl *InheritedCtor = | |||
13188 | Constructor->getInheritedConstructor().getConstructor(); | |||
13189 | ||||
13190 | // [class.inhctor.init]p1: | |||
13191 | // initialization proceeds as if a defaulted default constructor is used to | |||
13192 | // initialize the D object and each base class subobject from which the | |||
13193 | // constructor was inherited | |||
13194 | ||||
13195 | InheritedConstructorInfo ICI(*this, CurrentLocation, Shadow); | |||
13196 | CXXRecordDecl *RD = Shadow->getParent(); | |||
13197 | SourceLocation InitLoc = Shadow->getLocation(); | |||
13198 | ||||
13199 | // Build explicit initializers for all base classes from which the | |||
13200 | // constructor was inherited. | |||
13201 | SmallVector<CXXCtorInitializer*, 8> Inits; | |||
13202 | for (bool VBase : {false, true}) { | |||
13203 | for (CXXBaseSpecifier &B : VBase ? RD->vbases() : RD->bases()) { | |||
13204 | if (B.isVirtual() != VBase) | |||
13205 | continue; | |||
13206 | ||||
13207 | auto *BaseRD = B.getType()->getAsCXXRecordDecl(); | |||
13208 | if (!BaseRD) | |||
13209 | continue; | |||
13210 | ||||
13211 | auto BaseCtor = ICI.findConstructorForBase(BaseRD, InheritedCtor); | |||
13212 | if (!BaseCtor.first) | |||
13213 | continue; | |||
13214 | ||||
13215 | MarkFunctionReferenced(CurrentLocation, BaseCtor.first); | |||
13216 | ExprResult Init = new (Context) CXXInheritedCtorInitExpr( | |||
13217 | InitLoc, B.getType(), BaseCtor.first, VBase, BaseCtor.second); | |||
13218 | ||||
13219 | auto *TInfo = Context.getTrivialTypeSourceInfo(B.getType(), InitLoc); | |||
13220 | Inits.push_back(new (Context) CXXCtorInitializer( | |||
13221 | Context, TInfo, VBase, InitLoc, Init.get(), InitLoc, | |||
13222 | SourceLocation())); | |||
13223 | } | |||
13224 | } | |||
13225 | ||||
13226 | // We now proceed as if for a defaulted default constructor, with the relevant | |||
13227 | // initializers replaced. | |||
13228 | ||||
13229 | if (SetCtorInitializers(Constructor, /*AnyErrors*/false, Inits)) { | |||
13230 | Constructor->setInvalidDecl(); | |||
13231 | return; | |||
13232 | } | |||
13233 | ||||
13234 | Constructor->setBody(new (Context) CompoundStmt(InitLoc)); | |||
13235 | Constructor->markUsed(Context); | |||
13236 | ||||
13237 | if (ASTMutationListener *L = getASTMutationListener()) { | |||
13238 | L->CompletedImplicitDefinition(Constructor); | |||
13239 | } | |||
13240 | ||||
13241 | DiagnoseUninitializedFields(*this, Constructor); | |||
13242 | } | |||
13243 | ||||
13244 | CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { | |||
13245 | // C++ [class.dtor]p2: | |||
13246 | // If a class has no user-declared destructor, a destructor is | |||
13247 | // declared implicitly. An implicitly-declared destructor is an | |||
13248 | // inline public member of its class. | |||
13249 | assert(ClassDecl->needsImplicitDestructor())((ClassDecl->needsImplicitDestructor()) ? static_cast<void > (0) : __assert_fail ("ClassDecl->needsImplicitDestructor()" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13249, __PRETTY_FUNCTION__)); | |||
13250 | ||||
13251 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor); | |||
13252 | if (DSM.isAlreadyBeingDeclared()) | |||
13253 | return nullptr; | |||
13254 | ||||
13255 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, | |||
13256 | CXXDestructor, | |||
13257 | false); | |||
13258 | ||||
13259 | // Create the actual destructor declaration. | |||
13260 | CanQualType ClassType | |||
13261 | = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); | |||
13262 | SourceLocation ClassLoc = ClassDecl->getLocation(); | |||
13263 | DeclarationName Name | |||
13264 | = Context.DeclarationNames.getCXXDestructorName(ClassType); | |||
13265 | DeclarationNameInfo NameInfo(Name, ClassLoc); | |||
13266 | CXXDestructorDecl *Destructor = | |||
13267 | CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, | |||
13268 | QualType(), nullptr, /*isInline=*/true, | |||
13269 | /*isImplicitlyDeclared=*/true, | |||
13270 | Constexpr ? ConstexprSpecKind::Constexpr | |||
13271 | : ConstexprSpecKind::Unspecified); | |||
13272 | Destructor->setAccess(AS_public); | |||
13273 | Destructor->setDefaulted(); | |||
13274 | ||||
13275 | if (getLangOpts().CUDA) { | |||
13276 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXDestructor, | |||
13277 | Destructor, | |||
13278 | /* ConstRHS */ false, | |||
13279 | /* Diagnose */ false); | |||
13280 | } | |||
13281 | ||||
13282 | setupImplicitSpecialMemberType(Destructor, Context.VoidTy, None); | |||
13283 | ||||
13284 | // We don't need to use SpecialMemberIsTrivial here; triviality for | |||
13285 | // destructors is easy to compute. | |||
13286 | Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); | |||
13287 | Destructor->setTrivialForCall(ClassDecl->hasAttr<TrivialABIAttr>() || | |||
13288 | ClassDecl->hasTrivialDestructorForCall()); | |||
13289 | ||||
13290 | // Note that we have declared this destructor. | |||
13291 | ++getASTContext().NumImplicitDestructorsDeclared; | |||
13292 | ||||
13293 | Scope *S = getScopeForContext(ClassDecl); | |||
13294 | CheckImplicitSpecialMemberDeclaration(S, Destructor); | |||
13295 | ||||
13296 | // We can't check whether an implicit destructor is deleted before we complete | |||
13297 | // the definition of the class, because its validity depends on the alignment | |||
13298 | // of the class. We'll check this from ActOnFields once the class is complete. | |||
13299 | if (ClassDecl->isCompleteDefinition() && | |||
13300 | ShouldDeleteSpecialMember(Destructor, CXXDestructor)) | |||
13301 | SetDeclDeleted(Destructor, ClassLoc); | |||
13302 | ||||
13303 | // Introduce this destructor into its scope. | |||
13304 | if (S) | |||
13305 | PushOnScopeChains(Destructor, S, false); | |||
13306 | ClassDecl->addDecl(Destructor); | |||
13307 | ||||
13308 | return Destructor; | |||
13309 | } | |||
13310 | ||||
13311 | void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, | |||
13312 | CXXDestructorDecl *Destructor) { | |||
13313 | assert((Destructor->isDefaulted() &&(((Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody () && !Destructor->isDeleted()) && "DefineImplicitDestructor - call it for implicit default dtor" ) ? static_cast<void> (0) : __assert_fail ("(Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody() && !Destructor->isDeleted()) && \"DefineImplicitDestructor - call it for implicit default dtor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13316, __PRETTY_FUNCTION__)) | |||
13314 | !Destructor->doesThisDeclarationHaveABody() &&(((Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody () && !Destructor->isDeleted()) && "DefineImplicitDestructor - call it for implicit default dtor" ) ? static_cast<void> (0) : __assert_fail ("(Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody() && !Destructor->isDeleted()) && \"DefineImplicitDestructor - call it for implicit default dtor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13316, __PRETTY_FUNCTION__)) | |||
13315 | !Destructor->isDeleted()) &&(((Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody () && !Destructor->isDeleted()) && "DefineImplicitDestructor - call it for implicit default dtor" ) ? static_cast<void> (0) : __assert_fail ("(Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody() && !Destructor->isDeleted()) && \"DefineImplicitDestructor - call it for implicit default dtor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13316, __PRETTY_FUNCTION__)) | |||
13316 | "DefineImplicitDestructor - call it for implicit default dtor")(((Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody () && !Destructor->isDeleted()) && "DefineImplicitDestructor - call it for implicit default dtor" ) ? static_cast<void> (0) : __assert_fail ("(Destructor->isDefaulted() && !Destructor->doesThisDeclarationHaveABody() && !Destructor->isDeleted()) && \"DefineImplicitDestructor - call it for implicit default dtor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13316, __PRETTY_FUNCTION__)); | |||
13317 | if (Destructor->willHaveBody() || Destructor->isInvalidDecl()) | |||
13318 | return; | |||
13319 | ||||
13320 | CXXRecordDecl *ClassDecl = Destructor->getParent(); | |||
13321 | assert(ClassDecl && "DefineImplicitDestructor - invalid destructor")((ClassDecl && "DefineImplicitDestructor - invalid destructor" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl && \"DefineImplicitDestructor - invalid destructor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13321, __PRETTY_FUNCTION__)); | |||
13322 | ||||
13323 | SynthesizedFunctionScope Scope(*this, Destructor); | |||
13324 | ||||
13325 | // The exception specification is needed because we are defining the | |||
13326 | // function. | |||
13327 | ResolveExceptionSpec(CurrentLocation, | |||
13328 | Destructor->getType()->castAs<FunctionProtoType>()); | |||
13329 | MarkVTableUsed(CurrentLocation, ClassDecl); | |||
13330 | ||||
13331 | // Add a context note for diagnostics produced after this point. | |||
13332 | Scope.addContextNote(CurrentLocation); | |||
13333 | ||||
13334 | MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), | |||
13335 | Destructor->getParent()); | |||
13336 | ||||
13337 | if (CheckDestructor(Destructor)) { | |||
13338 | Destructor->setInvalidDecl(); | |||
13339 | return; | |||
13340 | } | |||
13341 | ||||
13342 | SourceLocation Loc = Destructor->getEndLoc().isValid() | |||
13343 | ? Destructor->getEndLoc() | |||
13344 | : Destructor->getLocation(); | |||
13345 | Destructor->setBody(new (Context) CompoundStmt(Loc)); | |||
13346 | Destructor->markUsed(Context); | |||
13347 | ||||
13348 | if (ASTMutationListener *L = getASTMutationListener()) { | |||
13349 | L->CompletedImplicitDefinition(Destructor); | |||
13350 | } | |||
13351 | } | |||
13352 | ||||
13353 | void Sema::CheckCompleteDestructorVariant(SourceLocation CurrentLocation, | |||
13354 | CXXDestructorDecl *Destructor) { | |||
13355 | if (Destructor->isInvalidDecl()) | |||
13356 | return; | |||
13357 | ||||
13358 | CXXRecordDecl *ClassDecl = Destructor->getParent(); | |||
13359 | assert(Context.getTargetInfo().getCXXABI().isMicrosoft() &&((Context.getTargetInfo().getCXXABI().isMicrosoft() && "implicit complete dtors unneeded outside MS ABI") ? static_cast <void> (0) : __assert_fail ("Context.getTargetInfo().getCXXABI().isMicrosoft() && \"implicit complete dtors unneeded outside MS ABI\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13360, __PRETTY_FUNCTION__)) | |||
13360 | "implicit complete dtors unneeded outside MS ABI")((Context.getTargetInfo().getCXXABI().isMicrosoft() && "implicit complete dtors unneeded outside MS ABI") ? static_cast <void> (0) : __assert_fail ("Context.getTargetInfo().getCXXABI().isMicrosoft() && \"implicit complete dtors unneeded outside MS ABI\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13360, __PRETTY_FUNCTION__)); | |||
13361 | assert(ClassDecl->getNumVBases() > 0 &&((ClassDecl->getNumVBases() > 0 && "complete dtor only exists for classes with vbases" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl->getNumVBases() > 0 && \"complete dtor only exists for classes with vbases\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13362, __PRETTY_FUNCTION__)) | |||
13362 | "complete dtor only exists for classes with vbases")((ClassDecl->getNumVBases() > 0 && "complete dtor only exists for classes with vbases" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl->getNumVBases() > 0 && \"complete dtor only exists for classes with vbases\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13362, __PRETTY_FUNCTION__)); | |||
13363 | ||||
13364 | SynthesizedFunctionScope Scope(*this, Destructor); | |||
13365 | ||||
13366 | // Add a context note for diagnostics produced after this point. | |||
13367 | Scope.addContextNote(CurrentLocation); | |||
13368 | ||||
13369 | MarkVirtualBaseDestructorsReferenced(Destructor->getLocation(), ClassDecl); | |||
13370 | } | |||
13371 | ||||
13372 | /// Perform any semantic analysis which needs to be delayed until all | |||
13373 | /// pending class member declarations have been parsed. | |||
13374 | void Sema::ActOnFinishCXXMemberDecls() { | |||
13375 | // If the context is an invalid C++ class, just suppress these checks. | |||
13376 | if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) { | |||
13377 | if (Record->isInvalidDecl()) { | |||
13378 | DelayedOverridingExceptionSpecChecks.clear(); | |||
13379 | DelayedEquivalentExceptionSpecChecks.clear(); | |||
13380 | return; | |||
13381 | } | |||
13382 | checkForMultipleExportedDefaultConstructors(*this, Record); | |||
13383 | } | |||
13384 | } | |||
13385 | ||||
13386 | void Sema::ActOnFinishCXXNonNestedClass() { | |||
13387 | referenceDLLExportedClassMethods(); | |||
13388 | ||||
13389 | if (!DelayedDllExportMemberFunctions.empty()) { | |||
| ||||
13390 | SmallVector<CXXMethodDecl*, 4> WorkList; | |||
13391 | std::swap(DelayedDllExportMemberFunctions, WorkList); | |||
13392 | for (CXXMethodDecl *M : WorkList) { | |||
13393 | DefineDefaultedFunction(*this, M, M->getLocation()); | |||
13394 | ||||
13395 | // Pass the method to the consumer to get emitted. This is not necessary | |||
13396 | // for explicit instantiation definitions, as they will get emitted | |||
13397 | // anyway. | |||
13398 | if (M->getParent()->getTemplateSpecializationKind() != | |||
13399 | TSK_ExplicitInstantiationDefinition) | |||
13400 | ActOnFinishInlineFunctionDef(M); | |||
13401 | } | |||
13402 | } | |||
13403 | } | |||
13404 | ||||
13405 | void Sema::referenceDLLExportedClassMethods() { | |||
13406 | if (!DelayedDllExportClasses.empty()) { | |||
13407 | // Calling ReferenceDllExportedMembers might cause the current function to | |||
13408 | // be called again, so use a local copy of DelayedDllExportClasses. | |||
13409 | SmallVector<CXXRecordDecl *, 4> WorkList; | |||
13410 | std::swap(DelayedDllExportClasses, WorkList); | |||
13411 | for (CXXRecordDecl *Class : WorkList) | |||
13412 | ReferenceDllExportedMembers(*this, Class); | |||
13413 | } | |||
13414 | } | |||
13415 | ||||
13416 | void Sema::AdjustDestructorExceptionSpec(CXXDestructorDecl *Destructor) { | |||
13417 | assert(getLangOpts().CPlusPlus11 &&((getLangOpts().CPlusPlus11 && "adjusting dtor exception specs was introduced in c++11" ) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus11 && \"adjusting dtor exception specs was introduced in c++11\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13418, __PRETTY_FUNCTION__)) | |||
13418 | "adjusting dtor exception specs was introduced in c++11")((getLangOpts().CPlusPlus11 && "adjusting dtor exception specs was introduced in c++11" ) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus11 && \"adjusting dtor exception specs was introduced in c++11\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13418, __PRETTY_FUNCTION__)); | |||
13419 | ||||
13420 | if (Destructor->isDependentContext()) | |||
13421 | return; | |||
13422 | ||||
13423 | // C++11 [class.dtor]p3: | |||
13424 | // A declaration of a destructor that does not have an exception- | |||
13425 | // specification is implicitly considered to have the same exception- | |||
13426 | // specification as an implicit declaration. | |||
13427 | const auto *DtorType = Destructor->getType()->castAs<FunctionProtoType>(); | |||
13428 | if (DtorType->hasExceptionSpec()) | |||
13429 | return; | |||
13430 | ||||
13431 | // Replace the destructor's type, building off the existing one. Fortunately, | |||
13432 | // the only thing of interest in the destructor type is its extended info. | |||
13433 | // The return and arguments are fixed. | |||
13434 | FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); | |||
13435 | EPI.ExceptionSpec.Type = EST_Unevaluated; | |||
13436 | EPI.ExceptionSpec.SourceDecl = Destructor; | |||
13437 | Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); | |||
13438 | ||||
13439 | // FIXME: If the destructor has a body that could throw, and the newly created | |||
13440 | // spec doesn't allow exceptions, we should emit a warning, because this | |||
13441 | // change in behavior can break conforming C++03 programs at runtime. | |||
13442 | // However, we don't have a body or an exception specification yet, so it | |||
13443 | // needs to be done somewhere else. | |||
13444 | } | |||
13445 | ||||
13446 | namespace { | |||
13447 | /// An abstract base class for all helper classes used in building the | |||
13448 | // copy/move operators. These classes serve as factory functions and help us | |||
13449 | // avoid using the same Expr* in the AST twice. | |||
13450 | class ExprBuilder { | |||
13451 | ExprBuilder(const ExprBuilder&) = delete; | |||
13452 | ExprBuilder &operator=(const ExprBuilder&) = delete; | |||
13453 | ||||
13454 | protected: | |||
13455 | static Expr *assertNotNull(Expr *E) { | |||
13456 | assert(E && "Expression construction must not fail.")((E && "Expression construction must not fail.") ? static_cast <void> (0) : __assert_fail ("E && \"Expression construction must not fail.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13456, __PRETTY_FUNCTION__)); | |||
13457 | return E; | |||
13458 | } | |||
13459 | ||||
13460 | public: | |||
13461 | ExprBuilder() {} | |||
13462 | virtual ~ExprBuilder() {} | |||
13463 | ||||
13464 | virtual Expr *build(Sema &S, SourceLocation Loc) const = 0; | |||
13465 | }; | |||
13466 | ||||
13467 | class RefBuilder: public ExprBuilder { | |||
13468 | VarDecl *Var; | |||
13469 | QualType VarType; | |||
13470 | ||||
13471 | public: | |||
13472 | Expr *build(Sema &S, SourceLocation Loc) const override { | |||
13473 | return assertNotNull(S.BuildDeclRefExpr(Var, VarType, VK_LValue, Loc)); | |||
13474 | } | |||
13475 | ||||
13476 | RefBuilder(VarDecl *Var, QualType VarType) | |||
13477 | : Var(Var), VarType(VarType) {} | |||
13478 | }; | |||
13479 | ||||
13480 | class ThisBuilder: public ExprBuilder { | |||
13481 | public: | |||
13482 | Expr *build(Sema &S, SourceLocation Loc) const override { | |||
13483 | return assertNotNull(S.ActOnCXXThis(Loc).getAs<Expr>()); | |||
13484 | } | |||
13485 | }; | |||
13486 | ||||
13487 | class CastBuilder: public ExprBuilder { | |||
13488 | const ExprBuilder &Builder; | |||
13489 | QualType Type; | |||
13490 | ExprValueKind Kind; | |||
13491 | const CXXCastPath &Path; | |||
13492 | ||||
13493 | public: | |||
13494 | Expr *build(Sema &S, SourceLocation Loc) const override { | |||
13495 | return assertNotNull(S.ImpCastExprToType(Builder.build(S, Loc), Type, | |||
13496 | CK_UncheckedDerivedToBase, Kind, | |||
13497 | &Path).get()); | |||
13498 | } | |||
13499 | ||||
13500 | CastBuilder(const ExprBuilder &Builder, QualType Type, ExprValueKind Kind, | |||
13501 | const CXXCastPath &Path) | |||
13502 | : Builder(Builder), Type(Type), Kind(Kind), Path(Path) {} | |||
13503 | }; | |||
13504 | ||||
13505 | class DerefBuilder: public ExprBuilder { | |||
13506 | const ExprBuilder &Builder; | |||
13507 | ||||
13508 | public: | |||
13509 | Expr *build(Sema &S, SourceLocation Loc) const override { | |||
13510 | return assertNotNull( | |||
13511 | S.CreateBuiltinUnaryOp(Loc, UO_Deref, Builder.build(S, Loc)).get()); | |||
13512 | } | |||
13513 | ||||
13514 | DerefBuilder(const ExprBuilder &Builder) : Builder(Builder) {} | |||
13515 | }; | |||
13516 | ||||
13517 | class MemberBuilder: public ExprBuilder { | |||
13518 | const ExprBuilder &Builder; | |||
13519 | QualType Type; | |||
13520 | CXXScopeSpec SS; | |||
13521 | bool IsArrow; | |||
13522 | LookupResult &MemberLookup; | |||
13523 | ||||
13524 | public: | |||
13525 | Expr *build(Sema &S, SourceLocation Loc) const override { | |||
13526 | return assertNotNull(S.BuildMemberReferenceExpr( | |||
13527 | Builder.build(S, Loc), Type, Loc, IsArrow, SS, SourceLocation(), | |||
13528 | nullptr, MemberLookup, nullptr, nullptr).get()); | |||
13529 | } | |||
13530 | ||||
13531 | MemberBuilder(const ExprBuilder &Builder, QualType Type, bool IsArrow, | |||
13532 | LookupResult &MemberLookup) | |||
13533 | : Builder(Builder), Type(Type), IsArrow(IsArrow), | |||
13534 | MemberLookup(MemberLookup) {} | |||
13535 | }; | |||
13536 | ||||
13537 | class MoveCastBuilder: public ExprBuilder { | |||
13538 | const ExprBuilder &Builder; | |||
13539 | ||||
13540 | public: | |||
13541 | Expr *build(Sema &S, SourceLocation Loc) const override { | |||
13542 | return assertNotNull(CastForMoving(S, Builder.build(S, Loc))); | |||
13543 | } | |||
13544 | ||||
13545 | MoveCastBuilder(const ExprBuilder &Builder) : Builder(Builder) {} | |||
13546 | }; | |||
13547 | ||||
13548 | class LvalueConvBuilder: public ExprBuilder { | |||
13549 | const ExprBuilder &Builder; | |||
13550 | ||||
13551 | public: | |||
13552 | Expr *build(Sema &S, SourceLocation Loc) const override { | |||
13553 | return assertNotNull( | |||
13554 | S.DefaultLvalueConversion(Builder.build(S, Loc)).get()); | |||
13555 | } | |||
13556 | ||||
13557 | LvalueConvBuilder(const ExprBuilder &Builder) : Builder(Builder) {} | |||
13558 | }; | |||
13559 | ||||
13560 | class SubscriptBuilder: public ExprBuilder { | |||
13561 | const ExprBuilder &Base; | |||
13562 | const ExprBuilder &Index; | |||
13563 | ||||
13564 | public: | |||
13565 | Expr *build(Sema &S, SourceLocation Loc) const override { | |||
13566 | return assertNotNull(S.CreateBuiltinArraySubscriptExpr( | |||
13567 | Base.build(S, Loc), Loc, Index.build(S, Loc), Loc).get()); | |||
13568 | } | |||
13569 | ||||
13570 | SubscriptBuilder(const ExprBuilder &Base, const ExprBuilder &Index) | |||
13571 | : Base(Base), Index(Index) {} | |||
13572 | }; | |||
13573 | ||||
13574 | } // end anonymous namespace | |||
13575 | ||||
13576 | /// When generating a defaulted copy or move assignment operator, if a field | |||
13577 | /// should be copied with __builtin_memcpy rather than via explicit assignments, | |||
13578 | /// do so. This optimization only applies for arrays of scalars, and for arrays | |||
13579 | /// of class type where the selected copy/move-assignment operator is trivial. | |||
13580 | static StmtResult | |||
13581 | buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, | |||
13582 | const ExprBuilder &ToB, const ExprBuilder &FromB) { | |||
13583 | // Compute the size of the memory buffer to be copied. | |||
13584 | QualType SizeType = S.Context.getSizeType(); | |||
13585 | llvm::APInt Size(S.Context.getTypeSize(SizeType), | |||
13586 | S.Context.getTypeSizeInChars(T).getQuantity()); | |||
13587 | ||||
13588 | // Take the address of the field references for "from" and "to". We | |||
13589 | // directly construct UnaryOperators here because semantic analysis | |||
13590 | // does not permit us to take the address of an xvalue. | |||
13591 | Expr *From = FromB.build(S, Loc); | |||
13592 | From = UnaryOperator::Create( | |||
13593 | S.Context, From, UO_AddrOf, S.Context.getPointerType(From->getType()), | |||
13594 | VK_RValue, OK_Ordinary, Loc, false, S.CurFPFeatureOverrides()); | |||
13595 | Expr *To = ToB.build(S, Loc); | |||
13596 | To = UnaryOperator::Create( | |||
13597 | S.Context, To, UO_AddrOf, S.Context.getPointerType(To->getType()), | |||
13598 | VK_RValue, OK_Ordinary, Loc, false, S.CurFPFeatureOverrides()); | |||
13599 | ||||
13600 | const Type *E = T->getBaseElementTypeUnsafe(); | |||
13601 | bool NeedsCollectableMemCpy = | |||
13602 | E->isRecordType() && | |||
13603 | E->castAs<RecordType>()->getDecl()->hasObjectMember(); | |||
13604 | ||||
13605 | // Create a reference to the __builtin_objc_memmove_collectable function | |||
13606 | StringRef MemCpyName = NeedsCollectableMemCpy ? | |||
13607 | "__builtin_objc_memmove_collectable" : | |||
13608 | "__builtin_memcpy"; | |||
13609 | LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc, | |||
13610 | Sema::LookupOrdinaryName); | |||
13611 | S.LookupName(R, S.TUScope, true); | |||
13612 | ||||
13613 | FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>(); | |||
13614 | if (!MemCpy) | |||
13615 | // Something went horribly wrong earlier, and we will have complained | |||
13616 | // about it. | |||
13617 | return StmtError(); | |||
13618 | ||||
13619 | ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy, | |||
13620 | VK_RValue, Loc, nullptr); | |||
13621 | assert(MemCpyRef.isUsable() && "Builtin reference cannot fail")((MemCpyRef.isUsable() && "Builtin reference cannot fail" ) ? static_cast<void> (0) : __assert_fail ("MemCpyRef.isUsable() && \"Builtin reference cannot fail\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13621, __PRETTY_FUNCTION__)); | |||
13622 | ||||
13623 | Expr *CallArgs[] = { | |||
13624 | To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc) | |||
13625 | }; | |||
13626 | ExprResult Call = S.BuildCallExpr(/*Scope=*/nullptr, MemCpyRef.get(), | |||
13627 | Loc, CallArgs, Loc); | |||
13628 | ||||
13629 | assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!")((!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!" ) ? static_cast<void> (0) : __assert_fail ("!Call.isInvalid() && \"Call to __builtin_memcpy cannot fail!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13629, __PRETTY_FUNCTION__)); | |||
13630 | return Call.getAs<Stmt>(); | |||
13631 | } | |||
13632 | ||||
13633 | /// Builds a statement that copies/moves the given entity from \p From to | |||
13634 | /// \c To. | |||
13635 | /// | |||
13636 | /// This routine is used to copy/move the members of a class with an | |||
13637 | /// implicitly-declared copy/move assignment operator. When the entities being | |||
13638 | /// copied are arrays, this routine builds for loops to copy them. | |||
13639 | /// | |||
13640 | /// \param S The Sema object used for type-checking. | |||
13641 | /// | |||
13642 | /// \param Loc The location where the implicit copy/move is being generated. | |||
13643 | /// | |||
13644 | /// \param T The type of the expressions being copied/moved. Both expressions | |||
13645 | /// must have this type. | |||
13646 | /// | |||
13647 | /// \param To The expression we are copying/moving to. | |||
13648 | /// | |||
13649 | /// \param From The expression we are copying/moving from. | |||
13650 | /// | |||
13651 | /// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. | |||
13652 | /// Otherwise, it's a non-static member subobject. | |||
13653 | /// | |||
13654 | /// \param Copying Whether we're copying or moving. | |||
13655 | /// | |||
13656 | /// \param Depth Internal parameter recording the depth of the recursion. | |||
13657 | /// | |||
13658 | /// \returns A statement or a loop that copies the expressions, or StmtResult(0) | |||
13659 | /// if a memcpy should be used instead. | |||
13660 | static StmtResult | |||
13661 | buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, | |||
13662 | const ExprBuilder &To, const ExprBuilder &From, | |||
13663 | bool CopyingBaseSubobject, bool Copying, | |||
13664 | unsigned Depth = 0) { | |||
13665 | // C++11 [class.copy]p28: | |||
13666 | // Each subobject is assigned in the manner appropriate to its type: | |||
13667 | // | |||
13668 | // - if the subobject is of class type, as if by a call to operator= with | |||
13669 | // the subobject as the object expression and the corresponding | |||
13670 | // subobject of x as a single function argument (as if by explicit | |||
13671 | // qualification; that is, ignoring any possible virtual overriding | |||
13672 | // functions in more derived classes); | |||
13673 | // | |||
13674 | // C++03 [class.copy]p13: | |||
13675 | // - if the subobject is of class type, the copy assignment operator for | |||
13676 | // the class is used (as if by explicit qualification; that is, | |||
13677 | // ignoring any possible virtual overriding functions in more derived | |||
13678 | // classes); | |||
13679 | if (const RecordType *RecordTy = T->getAs<RecordType>()) { | |||
13680 | CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); | |||
13681 | ||||
13682 | // Look for operator=. | |||
13683 | DeclarationName Name | |||
13684 | = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); | |||
13685 | LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); | |||
13686 | S.LookupQualifiedName(OpLookup, ClassDecl, false); | |||
13687 | ||||
13688 | // Prior to C++11, filter out any result that isn't a copy/move-assignment | |||
13689 | // operator. | |||
13690 | if (!S.getLangOpts().CPlusPlus11) { | |||
13691 | LookupResult::Filter F = OpLookup.makeFilter(); | |||
13692 | while (F.hasNext()) { | |||
13693 | NamedDecl *D = F.next(); | |||
13694 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) | |||
13695 | if (Method->isCopyAssignmentOperator() || | |||
13696 | (!Copying && Method->isMoveAssignmentOperator())) | |||
13697 | continue; | |||
13698 | ||||
13699 | F.erase(); | |||
13700 | } | |||
13701 | F.done(); | |||
13702 | } | |||
13703 | ||||
13704 | // Suppress the protected check (C++ [class.protected]) for each of the | |||
13705 | // assignment operators we found. This strange dance is required when | |||
13706 | // we're assigning via a base classes's copy-assignment operator. To | |||
13707 | // ensure that we're getting the right base class subobject (without | |||
13708 | // ambiguities), we need to cast "this" to that subobject type; to | |||
13709 | // ensure that we don't go through the virtual call mechanism, we need | |||
13710 | // to qualify the operator= name with the base class (see below). However, | |||
13711 | // this means that if the base class has a protected copy assignment | |||
13712 | // operator, the protected member access check will fail. So, we | |||
13713 | // rewrite "protected" access to "public" access in this case, since we | |||
13714 | // know by construction that we're calling from a derived class. | |||
13715 | if (CopyingBaseSubobject) { | |||
13716 | for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); | |||
13717 | L != LEnd; ++L) { | |||
13718 | if (L.getAccess() == AS_protected) | |||
13719 | L.setAccess(AS_public); | |||
13720 | } | |||
13721 | } | |||
13722 | ||||
13723 | // Create the nested-name-specifier that will be used to qualify the | |||
13724 | // reference to operator=; this is required to suppress the virtual | |||
13725 | // call mechanism. | |||
13726 | CXXScopeSpec SS; | |||
13727 | const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); | |||
13728 | SS.MakeTrivial(S.Context, | |||
13729 | NestedNameSpecifier::Create(S.Context, nullptr, false, | |||
13730 | CanonicalT), | |||
13731 | Loc); | |||
13732 | ||||
13733 | // Create the reference to operator=. | |||
13734 | ExprResult OpEqualRef | |||
13735 | = S.BuildMemberReferenceExpr(To.build(S, Loc), T, Loc, /*IsArrow=*/false, | |||
13736 | SS, /*TemplateKWLoc=*/SourceLocation(), | |||
13737 | /*FirstQualifierInScope=*/nullptr, | |||
13738 | OpLookup, | |||
13739 | /*TemplateArgs=*/nullptr, /*S*/nullptr, | |||
13740 | /*SuppressQualifierCheck=*/true); | |||
13741 | if (OpEqualRef.isInvalid()) | |||
13742 | return StmtError(); | |||
13743 | ||||
13744 | // Build the call to the assignment operator. | |||
13745 | ||||
13746 | Expr *FromInst = From.build(S, Loc); | |||
13747 | ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/nullptr, | |||
13748 | OpEqualRef.getAs<Expr>(), | |||
13749 | Loc, FromInst, Loc); | |||
13750 | if (Call.isInvalid()) | |||
13751 | return StmtError(); | |||
13752 | ||||
13753 | // If we built a call to a trivial 'operator=' while copying an array, | |||
13754 | // bail out. We'll replace the whole shebang with a memcpy. | |||
13755 | CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get()); | |||
13756 | if (CE && CE->getMethodDecl()->isTrivial() && Depth) | |||
13757 | return StmtResult((Stmt*)nullptr); | |||
13758 | ||||
13759 | // Convert to an expression-statement, and clean up any produced | |||
13760 | // temporaries. | |||
13761 | return S.ActOnExprStmt(Call); | |||
13762 | } | |||
13763 | ||||
13764 | // - if the subobject is of scalar type, the built-in assignment | |||
13765 | // operator is used. | |||
13766 | const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); | |||
13767 | if (!ArrayTy) { | |||
13768 | ExprResult Assignment = S.CreateBuiltinBinOp( | |||
13769 | Loc, BO_Assign, To.build(S, Loc), From.build(S, Loc)); | |||
13770 | if (Assignment.isInvalid()) | |||
13771 | return StmtError(); | |||
13772 | return S.ActOnExprStmt(Assignment); | |||
13773 | } | |||
13774 | ||||
13775 | // - if the subobject is an array, each element is assigned, in the | |||
13776 | // manner appropriate to the element type; | |||
13777 | ||||
13778 | // Construct a loop over the array bounds, e.g., | |||
13779 | // | |||
13780 | // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) | |||
13781 | // | |||
13782 | // that will copy each of the array elements. | |||
13783 | QualType SizeType = S.Context.getSizeType(); | |||
13784 | ||||
13785 | // Create the iteration variable. | |||
13786 | IdentifierInfo *IterationVarName = nullptr; | |||
13787 | { | |||
13788 | SmallString<8> Str; | |||
13789 | llvm::raw_svector_ostream OS(Str); | |||
13790 | OS << "__i" << Depth; | |||
13791 | IterationVarName = &S.Context.Idents.get(OS.str()); | |||
13792 | } | |||
13793 | VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, | |||
13794 | IterationVarName, SizeType, | |||
13795 | S.Context.getTrivialTypeSourceInfo(SizeType, Loc), | |||
13796 | SC_None); | |||
13797 | ||||
13798 | // Initialize the iteration variable to zero. | |||
13799 | llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); | |||
13800 | IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); | |||
13801 | ||||
13802 | // Creates a reference to the iteration variable. | |||
13803 | RefBuilder IterationVarRef(IterationVar, SizeType); | |||
13804 | LvalueConvBuilder IterationVarRefRVal(IterationVarRef); | |||
13805 | ||||
13806 | // Create the DeclStmt that holds the iteration variable. | |||
13807 | Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); | |||
13808 | ||||
13809 | // Subscript the "from" and "to" expressions with the iteration variable. | |||
13810 | SubscriptBuilder FromIndexCopy(From, IterationVarRefRVal); | |||
13811 | MoveCastBuilder FromIndexMove(FromIndexCopy); | |||
13812 | const ExprBuilder *FromIndex; | |||
13813 | if (Copying) | |||
13814 | FromIndex = &FromIndexCopy; | |||
13815 | else | |||
13816 | FromIndex = &FromIndexMove; | |||
13817 | ||||
13818 | SubscriptBuilder ToIndex(To, IterationVarRefRVal); | |||
13819 | ||||
13820 | // Build the copy/move for an individual element of the array. | |||
13821 | StmtResult Copy = | |||
13822 | buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(), | |||
13823 | ToIndex, *FromIndex, CopyingBaseSubobject, | |||
13824 | Copying, Depth + 1); | |||
13825 | // Bail out if copying fails or if we determined that we should use memcpy. | |||
13826 | if (Copy.isInvalid() || !Copy.get()) | |||
13827 | return Copy; | |||
13828 | ||||
13829 | // Create the comparison against the array bound. | |||
13830 | llvm::APInt Upper | |||
13831 | = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); | |||
13832 | Expr *Comparison = BinaryOperator::Create( | |||
13833 | S.Context, IterationVarRefRVal.build(S, Loc), | |||
13834 | IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), BO_NE, | |||
13835 | S.Context.BoolTy, VK_RValue, OK_Ordinary, Loc, S.CurFPFeatureOverrides()); | |||
13836 | ||||
13837 | // Create the pre-increment of the iteration variable. We can determine | |||
13838 | // whether the increment will overflow based on the value of the array | |||
13839 | // bound. | |||
13840 | Expr *Increment = UnaryOperator::Create( | |||
13841 | S.Context, IterationVarRef.build(S, Loc), UO_PreInc, SizeType, VK_LValue, | |||
13842 | OK_Ordinary, Loc, Upper.isMaxValue(), S.CurFPFeatureOverrides()); | |||
13843 | ||||
13844 | // Construct the loop that copies all elements of this array. | |||
13845 | return S.ActOnForStmt( | |||
13846 | Loc, Loc, InitStmt, | |||
13847 | S.ActOnCondition(nullptr, Loc, Comparison, Sema::ConditionKind::Boolean), | |||
13848 | S.MakeFullDiscardedValueExpr(Increment), Loc, Copy.get()); | |||
13849 | } | |||
13850 | ||||
13851 | static StmtResult | |||
13852 | buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, | |||
13853 | const ExprBuilder &To, const ExprBuilder &From, | |||
13854 | bool CopyingBaseSubobject, bool Copying) { | |||
13855 | // Maybe we should use a memcpy? | |||
13856 | if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() && | |||
13857 | T.isTriviallyCopyableType(S.Context)) | |||
13858 | return buildMemcpyForAssignmentOp(S, Loc, T, To, From); | |||
13859 | ||||
13860 | StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From, | |||
13861 | CopyingBaseSubobject, | |||
13862 | Copying, 0)); | |||
13863 | ||||
13864 | // If we ended up picking a trivial assignment operator for an array of a | |||
13865 | // non-trivially-copyable class type, just emit a memcpy. | |||
13866 | if (!Result.isInvalid() && !Result.get()) | |||
13867 | return buildMemcpyForAssignmentOp(S, Loc, T, To, From); | |||
13868 | ||||
13869 | return Result; | |||
13870 | } | |||
13871 | ||||
13872 | CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { | |||
13873 | // Note: The following rules are largely analoguous to the copy | |||
13874 | // constructor rules. Note that virtual bases are not taken into account | |||
13875 | // for determining the argument type of the operator. Note also that | |||
13876 | // operators taking an object instead of a reference are allowed. | |||
13877 | assert(ClassDecl->needsImplicitCopyAssignment())((ClassDecl->needsImplicitCopyAssignment()) ? static_cast< void> (0) : __assert_fail ("ClassDecl->needsImplicitCopyAssignment()" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13877, __PRETTY_FUNCTION__)); | |||
13878 | ||||
13879 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment); | |||
13880 | if (DSM.isAlreadyBeingDeclared()) | |||
13881 | return nullptr; | |||
13882 | ||||
13883 | QualType ArgType = Context.getTypeDeclType(ClassDecl); | |||
13884 | LangAS AS = getDefaultCXXMethodAddrSpace(); | |||
13885 | if (AS != LangAS::Default) | |||
13886 | ArgType = Context.getAddrSpaceQualType(ArgType, AS); | |||
13887 | QualType RetType = Context.getLValueReferenceType(ArgType); | |||
13888 | bool Const = ClassDecl->implicitCopyAssignmentHasConstParam(); | |||
13889 | if (Const) | |||
13890 | ArgType = ArgType.withConst(); | |||
13891 | ||||
13892 | ArgType = Context.getLValueReferenceType(ArgType); | |||
13893 | ||||
13894 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, | |||
13895 | CXXCopyAssignment, | |||
13896 | Const); | |||
13897 | ||||
13898 | // An implicitly-declared copy assignment operator is an inline public | |||
13899 | // member of its class. | |||
13900 | DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); | |||
13901 | SourceLocation ClassLoc = ClassDecl->getLocation(); | |||
13902 | DeclarationNameInfo NameInfo(Name, ClassLoc); | |||
13903 | CXXMethodDecl *CopyAssignment = CXXMethodDecl::Create( | |||
13904 | Context, ClassDecl, ClassLoc, NameInfo, QualType(), | |||
13905 | /*TInfo=*/nullptr, /*StorageClass=*/SC_None, | |||
13906 | /*isInline=*/true, | |||
13907 | Constexpr ? ConstexprSpecKind::Constexpr : ConstexprSpecKind::Unspecified, | |||
13908 | SourceLocation()); | |||
13909 | CopyAssignment->setAccess(AS_public); | |||
13910 | CopyAssignment->setDefaulted(); | |||
13911 | CopyAssignment->setImplicit(); | |||
13912 | ||||
13913 | if (getLangOpts().CUDA) { | |||
13914 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXCopyAssignment, | |||
13915 | CopyAssignment, | |||
13916 | /* ConstRHS */ Const, | |||
13917 | /* Diagnose */ false); | |||
13918 | } | |||
13919 | ||||
13920 | setupImplicitSpecialMemberType(CopyAssignment, RetType, ArgType); | |||
13921 | ||||
13922 | // Add the parameter to the operator. | |||
13923 | ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, | |||
13924 | ClassLoc, ClassLoc, | |||
13925 | /*Id=*/nullptr, ArgType, | |||
13926 | /*TInfo=*/nullptr, SC_None, | |||
13927 | nullptr); | |||
13928 | CopyAssignment->setParams(FromParam); | |||
13929 | ||||
13930 | CopyAssignment->setTrivial( | |||
13931 | ClassDecl->needsOverloadResolutionForCopyAssignment() | |||
13932 | ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment) | |||
13933 | : ClassDecl->hasTrivialCopyAssignment()); | |||
13934 | ||||
13935 | // Note that we have added this copy-assignment operator. | |||
13936 | ++getASTContext().NumImplicitCopyAssignmentOperatorsDeclared; | |||
13937 | ||||
13938 | Scope *S = getScopeForContext(ClassDecl); | |||
13939 | CheckImplicitSpecialMemberDeclaration(S, CopyAssignment); | |||
13940 | ||||
13941 | if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) { | |||
13942 | ClassDecl->setImplicitCopyAssignmentIsDeleted(); | |||
13943 | SetDeclDeleted(CopyAssignment, ClassLoc); | |||
13944 | } | |||
13945 | ||||
13946 | if (S) | |||
13947 | PushOnScopeChains(CopyAssignment, S, false); | |||
13948 | ClassDecl->addDecl(CopyAssignment); | |||
13949 | ||||
13950 | return CopyAssignment; | |||
13951 | } | |||
13952 | ||||
13953 | /// Diagnose an implicit copy operation for a class which is odr-used, but | |||
13954 | /// which is deprecated because the class has a user-declared copy constructor, | |||
13955 | /// copy assignment operator, or destructor. | |||
13956 | static void diagnoseDeprecatedCopyOperation(Sema &S, CXXMethodDecl *CopyOp) { | |||
13957 | assert(CopyOp->isImplicit())((CopyOp->isImplicit()) ? static_cast<void> (0) : __assert_fail ("CopyOp->isImplicit()", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13957, __PRETTY_FUNCTION__)); | |||
13958 | ||||
13959 | CXXRecordDecl *RD = CopyOp->getParent(); | |||
13960 | CXXMethodDecl *UserDeclaredOperation = nullptr; | |||
13961 | ||||
13962 | // In Microsoft mode, assignment operations don't affect constructors and | |||
13963 | // vice versa. | |||
13964 | if (RD->hasUserDeclaredDestructor()) { | |||
13965 | UserDeclaredOperation = RD->getDestructor(); | |||
13966 | } else if (!isa<CXXConstructorDecl>(CopyOp) && | |||
13967 | RD->hasUserDeclaredCopyConstructor() && | |||
13968 | !S.getLangOpts().MSVCCompat) { | |||
13969 | // Find any user-declared copy constructor. | |||
13970 | for (auto *I : RD->ctors()) { | |||
13971 | if (I->isCopyConstructor()) { | |||
13972 | UserDeclaredOperation = I; | |||
13973 | break; | |||
13974 | } | |||
13975 | } | |||
13976 | assert(UserDeclaredOperation)((UserDeclaredOperation) ? static_cast<void> (0) : __assert_fail ("UserDeclaredOperation", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13976, __PRETTY_FUNCTION__)); | |||
13977 | } else if (isa<CXXConstructorDecl>(CopyOp) && | |||
13978 | RD->hasUserDeclaredCopyAssignment() && | |||
13979 | !S.getLangOpts().MSVCCompat) { | |||
13980 | // Find any user-declared move assignment operator. | |||
13981 | for (auto *I : RD->methods()) { | |||
13982 | if (I->isCopyAssignmentOperator()) { | |||
13983 | UserDeclaredOperation = I; | |||
13984 | break; | |||
13985 | } | |||
13986 | } | |||
13987 | assert(UserDeclaredOperation)((UserDeclaredOperation) ? static_cast<void> (0) : __assert_fail ("UserDeclaredOperation", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 13987, __PRETTY_FUNCTION__)); | |||
13988 | } | |||
13989 | ||||
13990 | if (UserDeclaredOperation && UserDeclaredOperation->isUserProvided()) { | |||
13991 | S.Diag(UserDeclaredOperation->getLocation(), | |||
13992 | isa<CXXDestructorDecl>(UserDeclaredOperation) | |||
13993 | ? diag::warn_deprecated_copy_dtor_operation | |||
13994 | : diag::warn_deprecated_copy_operation) | |||
13995 | << RD << /*copy assignment*/ !isa<CXXConstructorDecl>(CopyOp); | |||
13996 | } | |||
13997 | } | |||
13998 | ||||
13999 | void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, | |||
14000 | CXXMethodDecl *CopyAssignOperator) { | |||
14001 | assert((CopyAssignOperator->isDefaulted() &&(((CopyAssignOperator->isDefaulted() && CopyAssignOperator ->isOverloadedOperator() && CopyAssignOperator-> getOverloadedOperator() == OO_Equal && !CopyAssignOperator ->doesThisDeclarationHaveABody() && !CopyAssignOperator ->isDeleted()) && "DefineImplicitCopyAssignment called for wrong function" ) ? static_cast<void> (0) : __assert_fail ("(CopyAssignOperator->isDefaulted() && CopyAssignOperator->isOverloadedOperator() && CopyAssignOperator->getOverloadedOperator() == OO_Equal && !CopyAssignOperator->doesThisDeclarationHaveABody() && !CopyAssignOperator->isDeleted()) && \"DefineImplicitCopyAssignment called for wrong function\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14006, __PRETTY_FUNCTION__)) | |||
14002 | CopyAssignOperator->isOverloadedOperator() &&(((CopyAssignOperator->isDefaulted() && CopyAssignOperator ->isOverloadedOperator() && CopyAssignOperator-> getOverloadedOperator() == OO_Equal && !CopyAssignOperator ->doesThisDeclarationHaveABody() && !CopyAssignOperator ->isDeleted()) && "DefineImplicitCopyAssignment called for wrong function" ) ? static_cast<void> (0) : __assert_fail ("(CopyAssignOperator->isDefaulted() && CopyAssignOperator->isOverloadedOperator() && CopyAssignOperator->getOverloadedOperator() == OO_Equal && !CopyAssignOperator->doesThisDeclarationHaveABody() && !CopyAssignOperator->isDeleted()) && \"DefineImplicitCopyAssignment called for wrong function\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14006, __PRETTY_FUNCTION__)) | |||
14003 | CopyAssignOperator->getOverloadedOperator() == OO_Equal &&(((CopyAssignOperator->isDefaulted() && CopyAssignOperator ->isOverloadedOperator() && CopyAssignOperator-> getOverloadedOperator() == OO_Equal && !CopyAssignOperator ->doesThisDeclarationHaveABody() && !CopyAssignOperator ->isDeleted()) && "DefineImplicitCopyAssignment called for wrong function" ) ? static_cast<void> (0) : __assert_fail ("(CopyAssignOperator->isDefaulted() && CopyAssignOperator->isOverloadedOperator() && CopyAssignOperator->getOverloadedOperator() == OO_Equal && !CopyAssignOperator->doesThisDeclarationHaveABody() && !CopyAssignOperator->isDeleted()) && \"DefineImplicitCopyAssignment called for wrong function\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14006, __PRETTY_FUNCTION__)) | |||
14004 | !CopyAssignOperator->doesThisDeclarationHaveABody() &&(((CopyAssignOperator->isDefaulted() && CopyAssignOperator ->isOverloadedOperator() && CopyAssignOperator-> getOverloadedOperator() == OO_Equal && !CopyAssignOperator ->doesThisDeclarationHaveABody() && !CopyAssignOperator ->isDeleted()) && "DefineImplicitCopyAssignment called for wrong function" ) ? static_cast<void> (0) : __assert_fail ("(CopyAssignOperator->isDefaulted() && CopyAssignOperator->isOverloadedOperator() && CopyAssignOperator->getOverloadedOperator() == OO_Equal && !CopyAssignOperator->doesThisDeclarationHaveABody() && !CopyAssignOperator->isDeleted()) && \"DefineImplicitCopyAssignment called for wrong function\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14006, __PRETTY_FUNCTION__)) | |||
14005 | !CopyAssignOperator->isDeleted()) &&(((CopyAssignOperator->isDefaulted() && CopyAssignOperator ->isOverloadedOperator() && CopyAssignOperator-> getOverloadedOperator() == OO_Equal && !CopyAssignOperator ->doesThisDeclarationHaveABody() && !CopyAssignOperator ->isDeleted()) && "DefineImplicitCopyAssignment called for wrong function" ) ? static_cast<void> (0) : __assert_fail ("(CopyAssignOperator->isDefaulted() && CopyAssignOperator->isOverloadedOperator() && CopyAssignOperator->getOverloadedOperator() == OO_Equal && !CopyAssignOperator->doesThisDeclarationHaveABody() && !CopyAssignOperator->isDeleted()) && \"DefineImplicitCopyAssignment called for wrong function\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14006, __PRETTY_FUNCTION__)) | |||
14006 | "DefineImplicitCopyAssignment called for wrong function")(((CopyAssignOperator->isDefaulted() && CopyAssignOperator ->isOverloadedOperator() && CopyAssignOperator-> getOverloadedOperator() == OO_Equal && !CopyAssignOperator ->doesThisDeclarationHaveABody() && !CopyAssignOperator ->isDeleted()) && "DefineImplicitCopyAssignment called for wrong function" ) ? static_cast<void> (0) : __assert_fail ("(CopyAssignOperator->isDefaulted() && CopyAssignOperator->isOverloadedOperator() && CopyAssignOperator->getOverloadedOperator() == OO_Equal && !CopyAssignOperator->doesThisDeclarationHaveABody() && !CopyAssignOperator->isDeleted()) && \"DefineImplicitCopyAssignment called for wrong function\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14006, __PRETTY_FUNCTION__)); | |||
14007 | if (CopyAssignOperator->willHaveBody() || CopyAssignOperator->isInvalidDecl()) | |||
14008 | return; | |||
14009 | ||||
14010 | CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); | |||
14011 | if (ClassDecl->isInvalidDecl()) { | |||
14012 | CopyAssignOperator->setInvalidDecl(); | |||
14013 | return; | |||
14014 | } | |||
14015 | ||||
14016 | SynthesizedFunctionScope Scope(*this, CopyAssignOperator); | |||
14017 | ||||
14018 | // The exception specification is needed because we are defining the | |||
14019 | // function. | |||
14020 | ResolveExceptionSpec(CurrentLocation, | |||
14021 | CopyAssignOperator->getType()->castAs<FunctionProtoType>()); | |||
14022 | ||||
14023 | // Add a context note for diagnostics produced after this point. | |||
14024 | Scope.addContextNote(CurrentLocation); | |||
14025 | ||||
14026 | // C++11 [class.copy]p18: | |||
14027 | // The [definition of an implicitly declared copy assignment operator] is | |||
14028 | // deprecated if the class has a user-declared copy constructor or a | |||
14029 | // user-declared destructor. | |||
14030 | if (getLangOpts().CPlusPlus11 && CopyAssignOperator->isImplicit()) | |||
14031 | diagnoseDeprecatedCopyOperation(*this, CopyAssignOperator); | |||
14032 | ||||
14033 | // C++0x [class.copy]p30: | |||
14034 | // The implicitly-defined or explicitly-defaulted copy assignment operator | |||
14035 | // for a non-union class X performs memberwise copy assignment of its | |||
14036 | // subobjects. The direct base classes of X are assigned first, in the | |||
14037 | // order of their declaration in the base-specifier-list, and then the | |||
14038 | // immediate non-static data members of X are assigned, in the order in | |||
14039 | // which they were declared in the class definition. | |||
14040 | ||||
14041 | // The statements that form the synthesized function body. | |||
14042 | SmallVector<Stmt*, 8> Statements; | |||
14043 | ||||
14044 | // The parameter for the "other" object, which we are copying from. | |||
14045 | ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); | |||
14046 | Qualifiers OtherQuals = Other->getType().getQualifiers(); | |||
14047 | QualType OtherRefType = Other->getType(); | |||
14048 | if (const LValueReferenceType *OtherRef | |||
14049 | = OtherRefType->getAs<LValueReferenceType>()) { | |||
14050 | OtherRefType = OtherRef->getPointeeType(); | |||
14051 | OtherQuals = OtherRefType.getQualifiers(); | |||
14052 | } | |||
14053 | ||||
14054 | // Our location for everything implicitly-generated. | |||
14055 | SourceLocation Loc = CopyAssignOperator->getEndLoc().isValid() | |||
14056 | ? CopyAssignOperator->getEndLoc() | |||
14057 | : CopyAssignOperator->getLocation(); | |||
14058 | ||||
14059 | // Builds a DeclRefExpr for the "other" object. | |||
14060 | RefBuilder OtherRef(Other, OtherRefType); | |||
14061 | ||||
14062 | // Builds the "this" pointer. | |||
14063 | ThisBuilder This; | |||
14064 | ||||
14065 | // Assign base classes. | |||
14066 | bool Invalid = false; | |||
14067 | for (auto &Base : ClassDecl->bases()) { | |||
14068 | // Form the assignment: | |||
14069 | // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); | |||
14070 | QualType BaseType = Base.getType().getUnqualifiedType(); | |||
14071 | if (!BaseType->isRecordType()) { | |||
14072 | Invalid = true; | |||
14073 | continue; | |||
14074 | } | |||
14075 | ||||
14076 | CXXCastPath BasePath; | |||
14077 | BasePath.push_back(&Base); | |||
14078 | ||||
14079 | // Construct the "from" expression, which is an implicit cast to the | |||
14080 | // appropriately-qualified base type. | |||
14081 | CastBuilder From(OtherRef, Context.getQualifiedType(BaseType, OtherQuals), | |||
14082 | VK_LValue, BasePath); | |||
14083 | ||||
14084 | // Dereference "this". | |||
14085 | DerefBuilder DerefThis(This); | |||
14086 | CastBuilder To(DerefThis, | |||
14087 | Context.getQualifiedType( | |||
14088 | BaseType, CopyAssignOperator->getMethodQualifiers()), | |||
14089 | VK_LValue, BasePath); | |||
14090 | ||||
14091 | // Build the copy. | |||
14092 | StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType, | |||
14093 | To, From, | |||
14094 | /*CopyingBaseSubobject=*/true, | |||
14095 | /*Copying=*/true); | |||
14096 | if (Copy.isInvalid()) { | |||
14097 | CopyAssignOperator->setInvalidDecl(); | |||
14098 | return; | |||
14099 | } | |||
14100 | ||||
14101 | // Success! Record the copy. | |||
14102 | Statements.push_back(Copy.getAs<Expr>()); | |||
14103 | } | |||
14104 | ||||
14105 | // Assign non-static members. | |||
14106 | for (auto *Field : ClassDecl->fields()) { | |||
14107 | // FIXME: We should form some kind of AST representation for the implied | |||
14108 | // memcpy in a union copy operation. | |||
14109 | if (Field->isUnnamedBitfield() || Field->getParent()->isUnion()) | |||
14110 | continue; | |||
14111 | ||||
14112 | if (Field->isInvalidDecl()) { | |||
14113 | Invalid = true; | |||
14114 | continue; | |||
14115 | } | |||
14116 | ||||
14117 | // Check for members of reference type; we can't copy those. | |||
14118 | if (Field->getType()->isReferenceType()) { | |||
14119 | Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) | |||
14120 | << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); | |||
14121 | Diag(Field->getLocation(), diag::note_declared_at); | |||
14122 | Invalid = true; | |||
14123 | continue; | |||
14124 | } | |||
14125 | ||||
14126 | // Check for members of const-qualified, non-class type. | |||
14127 | QualType BaseType = Context.getBaseElementType(Field->getType()); | |||
14128 | if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { | |||
14129 | Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) | |||
14130 | << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); | |||
14131 | Diag(Field->getLocation(), diag::note_declared_at); | |||
14132 | Invalid = true; | |||
14133 | continue; | |||
14134 | } | |||
14135 | ||||
14136 | // Suppress assigning zero-width bitfields. | |||
14137 | if (Field->isZeroLengthBitField(Context)) | |||
14138 | continue; | |||
14139 | ||||
14140 | QualType FieldType = Field->getType().getNonReferenceType(); | |||
14141 | if (FieldType->isIncompleteArrayType()) { | |||
14142 | assert(ClassDecl->hasFlexibleArrayMember() &&((ClassDecl->hasFlexibleArrayMember() && "Incomplete array type is not valid" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl->hasFlexibleArrayMember() && \"Incomplete array type is not valid\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14143, __PRETTY_FUNCTION__)) | |||
14143 | "Incomplete array type is not valid")((ClassDecl->hasFlexibleArrayMember() && "Incomplete array type is not valid" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl->hasFlexibleArrayMember() && \"Incomplete array type is not valid\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14143, __PRETTY_FUNCTION__)); | |||
14144 | continue; | |||
14145 | } | |||
14146 | ||||
14147 | // Build references to the field in the object we're copying from and to. | |||
14148 | CXXScopeSpec SS; // Intentionally empty | |||
14149 | LookupResult MemberLookup(*this, Field->getDeclName(), Loc, | |||
14150 | LookupMemberName); | |||
14151 | MemberLookup.addDecl(Field); | |||
14152 | MemberLookup.resolveKind(); | |||
14153 | ||||
14154 | MemberBuilder From(OtherRef, OtherRefType, /*IsArrow=*/false, MemberLookup); | |||
14155 | ||||
14156 | MemberBuilder To(This, getCurrentThisType(), /*IsArrow=*/true, MemberLookup); | |||
14157 | ||||
14158 | // Build the copy of this field. | |||
14159 | StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType, | |||
14160 | To, From, | |||
14161 | /*CopyingBaseSubobject=*/false, | |||
14162 | /*Copying=*/true); | |||
14163 | if (Copy.isInvalid()) { | |||
14164 | CopyAssignOperator->setInvalidDecl(); | |||
14165 | return; | |||
14166 | } | |||
14167 | ||||
14168 | // Success! Record the copy. | |||
14169 | Statements.push_back(Copy.getAs<Stmt>()); | |||
14170 | } | |||
14171 | ||||
14172 | if (!Invalid) { | |||
14173 | // Add a "return *this;" | |||
14174 | ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc)); | |||
14175 | ||||
14176 | StmtResult Return = BuildReturnStmt(Loc, ThisObj.get()); | |||
14177 | if (Return.isInvalid()) | |||
14178 | Invalid = true; | |||
14179 | else | |||
14180 | Statements.push_back(Return.getAs<Stmt>()); | |||
14181 | } | |||
14182 | ||||
14183 | if (Invalid) { | |||
14184 | CopyAssignOperator->setInvalidDecl(); | |||
14185 | return; | |||
14186 | } | |||
14187 | ||||
14188 | StmtResult Body; | |||
14189 | { | |||
14190 | CompoundScopeRAII CompoundScope(*this); | |||
14191 | Body = ActOnCompoundStmt(Loc, Loc, Statements, | |||
14192 | /*isStmtExpr=*/false); | |||
14193 | assert(!Body.isInvalid() && "Compound statement creation cannot fail")((!Body.isInvalid() && "Compound statement creation cannot fail" ) ? static_cast<void> (0) : __assert_fail ("!Body.isInvalid() && \"Compound statement creation cannot fail\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14193, __PRETTY_FUNCTION__)); | |||
14194 | } | |||
14195 | CopyAssignOperator->setBody(Body.getAs<Stmt>()); | |||
14196 | CopyAssignOperator->markUsed(Context); | |||
14197 | ||||
14198 | if (ASTMutationListener *L = getASTMutationListener()) { | |||
14199 | L->CompletedImplicitDefinition(CopyAssignOperator); | |||
14200 | } | |||
14201 | } | |||
14202 | ||||
14203 | CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { | |||
14204 | assert(ClassDecl->needsImplicitMoveAssignment())((ClassDecl->needsImplicitMoveAssignment()) ? static_cast< void> (0) : __assert_fail ("ClassDecl->needsImplicitMoveAssignment()" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14204, __PRETTY_FUNCTION__)); | |||
14205 | ||||
14206 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment); | |||
14207 | if (DSM.isAlreadyBeingDeclared()) | |||
14208 | return nullptr; | |||
14209 | ||||
14210 | // Note: The following rules are largely analoguous to the move | |||
14211 | // constructor rules. | |||
14212 | ||||
14213 | QualType ArgType = Context.getTypeDeclType(ClassDecl); | |||
14214 | LangAS AS = getDefaultCXXMethodAddrSpace(); | |||
14215 | if (AS != LangAS::Default) | |||
14216 | ArgType = Context.getAddrSpaceQualType(ArgType, AS); | |||
14217 | QualType RetType = Context.getLValueReferenceType(ArgType); | |||
14218 | ArgType = Context.getRValueReferenceType(ArgType); | |||
14219 | ||||
14220 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, | |||
14221 | CXXMoveAssignment, | |||
14222 | false); | |||
14223 | ||||
14224 | // An implicitly-declared move assignment operator is an inline public | |||
14225 | // member of its class. | |||
14226 | DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); | |||
14227 | SourceLocation ClassLoc = ClassDecl->getLocation(); | |||
14228 | DeclarationNameInfo NameInfo(Name, ClassLoc); | |||
14229 | CXXMethodDecl *MoveAssignment = CXXMethodDecl::Create( | |||
14230 | Context, ClassDecl, ClassLoc, NameInfo, QualType(), | |||
14231 | /*TInfo=*/nullptr, /*StorageClass=*/SC_None, | |||
14232 | /*isInline=*/true, | |||
14233 | Constexpr ? ConstexprSpecKind::Constexpr : ConstexprSpecKind::Unspecified, | |||
14234 | SourceLocation()); | |||
14235 | MoveAssignment->setAccess(AS_public); | |||
14236 | MoveAssignment->setDefaulted(); | |||
14237 | MoveAssignment->setImplicit(); | |||
14238 | ||||
14239 | if (getLangOpts().CUDA) { | |||
14240 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXMoveAssignment, | |||
14241 | MoveAssignment, | |||
14242 | /* ConstRHS */ false, | |||
14243 | /* Diagnose */ false); | |||
14244 | } | |||
14245 | ||||
14246 | // Build an exception specification pointing back at this member. | |||
14247 | FunctionProtoType::ExtProtoInfo EPI = | |||
14248 | getImplicitMethodEPI(*this, MoveAssignment); | |||
14249 | MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); | |||
14250 | ||||
14251 | // Add the parameter to the operator. | |||
14252 | ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, | |||
14253 | ClassLoc, ClassLoc, | |||
14254 | /*Id=*/nullptr, ArgType, | |||
14255 | /*TInfo=*/nullptr, SC_None, | |||
14256 | nullptr); | |||
14257 | MoveAssignment->setParams(FromParam); | |||
14258 | ||||
14259 | MoveAssignment->setTrivial( | |||
14260 | ClassDecl->needsOverloadResolutionForMoveAssignment() | |||
14261 | ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment) | |||
14262 | : ClassDecl->hasTrivialMoveAssignment()); | |||
14263 | ||||
14264 | // Note that we have added this copy-assignment operator. | |||
14265 | ++getASTContext().NumImplicitMoveAssignmentOperatorsDeclared; | |||
14266 | ||||
14267 | Scope *S = getScopeForContext(ClassDecl); | |||
14268 | CheckImplicitSpecialMemberDeclaration(S, MoveAssignment); | |||
14269 | ||||
14270 | if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { | |||
14271 | ClassDecl->setImplicitMoveAssignmentIsDeleted(); | |||
14272 | SetDeclDeleted(MoveAssignment, ClassLoc); | |||
14273 | } | |||
14274 | ||||
14275 | if (S) | |||
14276 | PushOnScopeChains(MoveAssignment, S, false); | |||
14277 | ClassDecl->addDecl(MoveAssignment); | |||
14278 | ||||
14279 | return MoveAssignment; | |||
14280 | } | |||
14281 | ||||
14282 | /// Check if we're implicitly defining a move assignment operator for a class | |||
14283 | /// with virtual bases. Such a move assignment might move-assign the virtual | |||
14284 | /// base multiple times. | |||
14285 | static void checkMoveAssignmentForRepeatedMove(Sema &S, CXXRecordDecl *Class, | |||
14286 | SourceLocation CurrentLocation) { | |||
14287 | assert(!Class->isDependentContext() && "should not define dependent move")((!Class->isDependentContext() && "should not define dependent move" ) ? static_cast<void> (0) : __assert_fail ("!Class->isDependentContext() && \"should not define dependent move\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14287, __PRETTY_FUNCTION__)); | |||
14288 | ||||
14289 | // Only a virtual base could get implicitly move-assigned multiple times. | |||
14290 | // Only a non-trivial move assignment can observe this. We only want to | |||
14291 | // diagnose if we implicitly define an assignment operator that assigns | |||
14292 | // two base classes, both of which move-assign the same virtual base. | |||
14293 | if (Class->getNumVBases() == 0 || Class->hasTrivialMoveAssignment() || | |||
14294 | Class->getNumBases() < 2) | |||
14295 | return; | |||
14296 | ||||
14297 | llvm::SmallVector<CXXBaseSpecifier *, 16> Worklist; | |||
14298 | typedef llvm::DenseMap<CXXRecordDecl*, CXXBaseSpecifier*> VBaseMap; | |||
14299 | VBaseMap VBases; | |||
14300 | ||||
14301 | for (auto &BI : Class->bases()) { | |||
14302 | Worklist.push_back(&BI); | |||
14303 | while (!Worklist.empty()) { | |||
14304 | CXXBaseSpecifier *BaseSpec = Worklist.pop_back_val(); | |||
14305 | CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl(); | |||
14306 | ||||
14307 | // If the base has no non-trivial move assignment operators, | |||
14308 | // we don't care about moves from it. | |||
14309 | if (!Base->hasNonTrivialMoveAssignment()) | |||
14310 | continue; | |||
14311 | ||||
14312 | // If there's nothing virtual here, skip it. | |||
14313 | if (!BaseSpec->isVirtual() && !Base->getNumVBases()) | |||
14314 | continue; | |||
14315 | ||||
14316 | // If we're not actually going to call a move assignment for this base, | |||
14317 | // or the selected move assignment is trivial, skip it. | |||
14318 | Sema::SpecialMemberOverloadResult SMOR = | |||
14319 | S.LookupSpecialMember(Base, Sema::CXXMoveAssignment, | |||
14320 | /*ConstArg*/false, /*VolatileArg*/false, | |||
14321 | /*RValueThis*/true, /*ConstThis*/false, | |||
14322 | /*VolatileThis*/false); | |||
14323 | if (!SMOR.getMethod() || SMOR.getMethod()->isTrivial() || | |||
14324 | !SMOR.getMethod()->isMoveAssignmentOperator()) | |||
14325 | continue; | |||
14326 | ||||
14327 | if (BaseSpec->isVirtual()) { | |||
14328 | // We're going to move-assign this virtual base, and its move | |||
14329 | // assignment operator is not trivial. If this can happen for | |||
14330 | // multiple distinct direct bases of Class, diagnose it. (If it | |||
14331 | // only happens in one base, we'll diagnose it when synthesizing | |||
14332 | // that base class's move assignment operator.) | |||
14333 | CXXBaseSpecifier *&Existing = | |||
14334 | VBases.insert(std::make_pair(Base->getCanonicalDecl(), &BI)) | |||
14335 | .first->second; | |||
14336 | if (Existing && Existing != &BI) { | |||
14337 | S.Diag(CurrentLocation, diag::warn_vbase_moved_multiple_times) | |||
14338 | << Class << Base; | |||
14339 | S.Diag(Existing->getBeginLoc(), diag::note_vbase_moved_here) | |||
14340 | << (Base->getCanonicalDecl() == | |||
14341 | Existing->getType()->getAsCXXRecordDecl()->getCanonicalDecl()) | |||
14342 | << Base << Existing->getType() << Existing->getSourceRange(); | |||
14343 | S.Diag(BI.getBeginLoc(), diag::note_vbase_moved_here) | |||
14344 | << (Base->getCanonicalDecl() == | |||
14345 | BI.getType()->getAsCXXRecordDecl()->getCanonicalDecl()) | |||
14346 | << Base << BI.getType() << BaseSpec->getSourceRange(); | |||
14347 | ||||
14348 | // Only diagnose each vbase once. | |||
14349 | Existing = nullptr; | |||
14350 | } | |||
14351 | } else { | |||
14352 | // Only walk over bases that have defaulted move assignment operators. | |||
14353 | // We assume that any user-provided move assignment operator handles | |||
14354 | // the multiple-moves-of-vbase case itself somehow. | |||
14355 | if (!SMOR.getMethod()->isDefaulted()) | |||
14356 | continue; | |||
14357 | ||||
14358 | // We're going to move the base classes of Base. Add them to the list. | |||
14359 | for (auto &BI : Base->bases()) | |||
14360 | Worklist.push_back(&BI); | |||
14361 | } | |||
14362 | } | |||
14363 | } | |||
14364 | } | |||
14365 | ||||
14366 | void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, | |||
14367 | CXXMethodDecl *MoveAssignOperator) { | |||
14368 | assert((MoveAssignOperator->isDefaulted() &&(((MoveAssignOperator->isDefaulted() && MoveAssignOperator ->isOverloadedOperator() && MoveAssignOperator-> getOverloadedOperator() == OO_Equal && !MoveAssignOperator ->doesThisDeclarationHaveABody() && !MoveAssignOperator ->isDeleted()) && "DefineImplicitMoveAssignment called for wrong function" ) ? static_cast<void> (0) : __assert_fail ("(MoveAssignOperator->isDefaulted() && MoveAssignOperator->isOverloadedOperator() && MoveAssignOperator->getOverloadedOperator() == OO_Equal && !MoveAssignOperator->doesThisDeclarationHaveABody() && !MoveAssignOperator->isDeleted()) && \"DefineImplicitMoveAssignment called for wrong function\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14373, __PRETTY_FUNCTION__)) | |||
14369 | MoveAssignOperator->isOverloadedOperator() &&(((MoveAssignOperator->isDefaulted() && MoveAssignOperator ->isOverloadedOperator() && MoveAssignOperator-> getOverloadedOperator() == OO_Equal && !MoveAssignOperator ->doesThisDeclarationHaveABody() && !MoveAssignOperator ->isDeleted()) && "DefineImplicitMoveAssignment called for wrong function" ) ? static_cast<void> (0) : __assert_fail ("(MoveAssignOperator->isDefaulted() && MoveAssignOperator->isOverloadedOperator() && MoveAssignOperator->getOverloadedOperator() == OO_Equal && !MoveAssignOperator->doesThisDeclarationHaveABody() && !MoveAssignOperator->isDeleted()) && \"DefineImplicitMoveAssignment called for wrong function\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14373, __PRETTY_FUNCTION__)) | |||
14370 | MoveAssignOperator->getOverloadedOperator() == OO_Equal &&(((MoveAssignOperator->isDefaulted() && MoveAssignOperator ->isOverloadedOperator() && MoveAssignOperator-> getOverloadedOperator() == OO_Equal && !MoveAssignOperator ->doesThisDeclarationHaveABody() && !MoveAssignOperator ->isDeleted()) && "DefineImplicitMoveAssignment called for wrong function" ) ? static_cast<void> (0) : __assert_fail ("(MoveAssignOperator->isDefaulted() && MoveAssignOperator->isOverloadedOperator() && MoveAssignOperator->getOverloadedOperator() == OO_Equal && !MoveAssignOperator->doesThisDeclarationHaveABody() && !MoveAssignOperator->isDeleted()) && \"DefineImplicitMoveAssignment called for wrong function\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14373, __PRETTY_FUNCTION__)) | |||
14371 | !MoveAssignOperator->doesThisDeclarationHaveABody() &&(((MoveAssignOperator->isDefaulted() && MoveAssignOperator ->isOverloadedOperator() && MoveAssignOperator-> getOverloadedOperator() == OO_Equal && !MoveAssignOperator ->doesThisDeclarationHaveABody() && !MoveAssignOperator ->isDeleted()) && "DefineImplicitMoveAssignment called for wrong function" ) ? static_cast<void> (0) : __assert_fail ("(MoveAssignOperator->isDefaulted() && MoveAssignOperator->isOverloadedOperator() && MoveAssignOperator->getOverloadedOperator() == OO_Equal && !MoveAssignOperator->doesThisDeclarationHaveABody() && !MoveAssignOperator->isDeleted()) && \"DefineImplicitMoveAssignment called for wrong function\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14373, __PRETTY_FUNCTION__)) | |||
14372 | !MoveAssignOperator->isDeleted()) &&(((MoveAssignOperator->isDefaulted() && MoveAssignOperator ->isOverloadedOperator() && MoveAssignOperator-> getOverloadedOperator() == OO_Equal && !MoveAssignOperator ->doesThisDeclarationHaveABody() && !MoveAssignOperator ->isDeleted()) && "DefineImplicitMoveAssignment called for wrong function" ) ? static_cast<void> (0) : __assert_fail ("(MoveAssignOperator->isDefaulted() && MoveAssignOperator->isOverloadedOperator() && MoveAssignOperator->getOverloadedOperator() == OO_Equal && !MoveAssignOperator->doesThisDeclarationHaveABody() && !MoveAssignOperator->isDeleted()) && \"DefineImplicitMoveAssignment called for wrong function\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14373, __PRETTY_FUNCTION__)) | |||
14373 | "DefineImplicitMoveAssignment called for wrong function")(((MoveAssignOperator->isDefaulted() && MoveAssignOperator ->isOverloadedOperator() && MoveAssignOperator-> getOverloadedOperator() == OO_Equal && !MoveAssignOperator ->doesThisDeclarationHaveABody() && !MoveAssignOperator ->isDeleted()) && "DefineImplicitMoveAssignment called for wrong function" ) ? static_cast<void> (0) : __assert_fail ("(MoveAssignOperator->isDefaulted() && MoveAssignOperator->isOverloadedOperator() && MoveAssignOperator->getOverloadedOperator() == OO_Equal && !MoveAssignOperator->doesThisDeclarationHaveABody() && !MoveAssignOperator->isDeleted()) && \"DefineImplicitMoveAssignment called for wrong function\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14373, __PRETTY_FUNCTION__)); | |||
14374 | if (MoveAssignOperator->willHaveBody() || MoveAssignOperator->isInvalidDecl()) | |||
14375 | return; | |||
14376 | ||||
14377 | CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); | |||
14378 | if (ClassDecl->isInvalidDecl()) { | |||
14379 | MoveAssignOperator->setInvalidDecl(); | |||
14380 | return; | |||
14381 | } | |||
14382 | ||||
14383 | // C++0x [class.copy]p28: | |||
14384 | // The implicitly-defined or move assignment operator for a non-union class | |||
14385 | // X performs memberwise move assignment of its subobjects. The direct base | |||
14386 | // classes of X are assigned first, in the order of their declaration in the | |||
14387 | // base-specifier-list, and then the immediate non-static data members of X | |||
14388 | // are assigned, in the order in which they were declared in the class | |||
14389 | // definition. | |||
14390 | ||||
14391 | // Issue a warning if our implicit move assignment operator will move | |||
14392 | // from a virtual base more than once. | |||
14393 | checkMoveAssignmentForRepeatedMove(*this, ClassDecl, CurrentLocation); | |||
14394 | ||||
14395 | SynthesizedFunctionScope Scope(*this, MoveAssignOperator); | |||
14396 | ||||
14397 | // The exception specification is needed because we are defining the | |||
14398 | // function. | |||
14399 | ResolveExceptionSpec(CurrentLocation, | |||
14400 | MoveAssignOperator->getType()->castAs<FunctionProtoType>()); | |||
14401 | ||||
14402 | // Add a context note for diagnostics produced after this point. | |||
14403 | Scope.addContextNote(CurrentLocation); | |||
14404 | ||||
14405 | // The statements that form the synthesized function body. | |||
14406 | SmallVector<Stmt*, 8> Statements; | |||
14407 | ||||
14408 | // The parameter for the "other" object, which we are move from. | |||
14409 | ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); | |||
14410 | QualType OtherRefType = | |||
14411 | Other->getType()->castAs<RValueReferenceType>()->getPointeeType(); | |||
14412 | ||||
14413 | // Our location for everything implicitly-generated. | |||
14414 | SourceLocation Loc = MoveAssignOperator->getEndLoc().isValid() | |||
14415 | ? MoveAssignOperator->getEndLoc() | |||
14416 | : MoveAssignOperator->getLocation(); | |||
14417 | ||||
14418 | // Builds a reference to the "other" object. | |||
14419 | RefBuilder OtherRef(Other, OtherRefType); | |||
14420 | // Cast to rvalue. | |||
14421 | MoveCastBuilder MoveOther(OtherRef); | |||
14422 | ||||
14423 | // Builds the "this" pointer. | |||
14424 | ThisBuilder This; | |||
14425 | ||||
14426 | // Assign base classes. | |||
14427 | bool Invalid = false; | |||
14428 | for (auto &Base : ClassDecl->bases()) { | |||
14429 | // C++11 [class.copy]p28: | |||
14430 | // It is unspecified whether subobjects representing virtual base classes | |||
14431 | // are assigned more than once by the implicitly-defined copy assignment | |||
14432 | // operator. | |||
14433 | // FIXME: Do not assign to a vbase that will be assigned by some other base | |||
14434 | // class. For a move-assignment, this can result in the vbase being moved | |||
14435 | // multiple times. | |||
14436 | ||||
14437 | // Form the assignment: | |||
14438 | // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); | |||
14439 | QualType BaseType = Base.getType().getUnqualifiedType(); | |||
14440 | if (!BaseType->isRecordType()) { | |||
14441 | Invalid = true; | |||
14442 | continue; | |||
14443 | } | |||
14444 | ||||
14445 | CXXCastPath BasePath; | |||
14446 | BasePath.push_back(&Base); | |||
14447 | ||||
14448 | // Construct the "from" expression, which is an implicit cast to the | |||
14449 | // appropriately-qualified base type. | |||
14450 | CastBuilder From(OtherRef, BaseType, VK_XValue, BasePath); | |||
14451 | ||||
14452 | // Dereference "this". | |||
14453 | DerefBuilder DerefThis(This); | |||
14454 | ||||
14455 | // Implicitly cast "this" to the appropriately-qualified base type. | |||
14456 | CastBuilder To(DerefThis, | |||
14457 | Context.getQualifiedType( | |||
14458 | BaseType, MoveAssignOperator->getMethodQualifiers()), | |||
14459 | VK_LValue, BasePath); | |||
14460 | ||||
14461 | // Build the move. | |||
14462 | StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType, | |||
14463 | To, From, | |||
14464 | /*CopyingBaseSubobject=*/true, | |||
14465 | /*Copying=*/false); | |||
14466 | if (Move.isInvalid()) { | |||
14467 | MoveAssignOperator->setInvalidDecl(); | |||
14468 | return; | |||
14469 | } | |||
14470 | ||||
14471 | // Success! Record the move. | |||
14472 | Statements.push_back(Move.getAs<Expr>()); | |||
14473 | } | |||
14474 | ||||
14475 | // Assign non-static members. | |||
14476 | for (auto *Field : ClassDecl->fields()) { | |||
14477 | // FIXME: We should form some kind of AST representation for the implied | |||
14478 | // memcpy in a union copy operation. | |||
14479 | if (Field->isUnnamedBitfield() || Field->getParent()->isUnion()) | |||
14480 | continue; | |||
14481 | ||||
14482 | if (Field->isInvalidDecl()) { | |||
14483 | Invalid = true; | |||
14484 | continue; | |||
14485 | } | |||
14486 | ||||
14487 | // Check for members of reference type; we can't move those. | |||
14488 | if (Field->getType()->isReferenceType()) { | |||
14489 | Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) | |||
14490 | << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); | |||
14491 | Diag(Field->getLocation(), diag::note_declared_at); | |||
14492 | Invalid = true; | |||
14493 | continue; | |||
14494 | } | |||
14495 | ||||
14496 | // Check for members of const-qualified, non-class type. | |||
14497 | QualType BaseType = Context.getBaseElementType(Field->getType()); | |||
14498 | if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { | |||
14499 | Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) | |||
14500 | << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); | |||
14501 | Diag(Field->getLocation(), diag::note_declared_at); | |||
14502 | Invalid = true; | |||
14503 | continue; | |||
14504 | } | |||
14505 | ||||
14506 | // Suppress assigning zero-width bitfields. | |||
14507 | if (Field->isZeroLengthBitField(Context)) | |||
14508 | continue; | |||
14509 | ||||
14510 | QualType FieldType = Field->getType().getNonReferenceType(); | |||
14511 | if (FieldType->isIncompleteArrayType()) { | |||
14512 | assert(ClassDecl->hasFlexibleArrayMember() &&((ClassDecl->hasFlexibleArrayMember() && "Incomplete array type is not valid" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl->hasFlexibleArrayMember() && \"Incomplete array type is not valid\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14513, __PRETTY_FUNCTION__)) | |||
14513 | "Incomplete array type is not valid")((ClassDecl->hasFlexibleArrayMember() && "Incomplete array type is not valid" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl->hasFlexibleArrayMember() && \"Incomplete array type is not valid\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14513, __PRETTY_FUNCTION__)); | |||
14514 | continue; | |||
14515 | } | |||
14516 | ||||
14517 | // Build references to the field in the object we're copying from and to. | |||
14518 | LookupResult MemberLookup(*this, Field->getDeclName(), Loc, | |||
14519 | LookupMemberName); | |||
14520 | MemberLookup.addDecl(Field); | |||
14521 | MemberLookup.resolveKind(); | |||
14522 | MemberBuilder From(MoveOther, OtherRefType, | |||
14523 | /*IsArrow=*/false, MemberLookup); | |||
14524 | MemberBuilder To(This, getCurrentThisType(), | |||
14525 | /*IsArrow=*/true, MemberLookup); | |||
14526 | ||||
14527 | assert(!From.build(*this, Loc)->isLValue() && // could be xvalue or prvalue((!From.build(*this, Loc)->isLValue() && "Member reference with rvalue base must be rvalue except for reference " "members, which aren't allowed for move assignment.") ? static_cast <void> (0) : __assert_fail ("!From.build(*this, Loc)->isLValue() && \"Member reference with rvalue base must be rvalue except for reference \" \"members, which aren't allowed for move assignment.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14529, __PRETTY_FUNCTION__)) | |||
14528 | "Member reference with rvalue base must be rvalue except for reference "((!From.build(*this, Loc)->isLValue() && "Member reference with rvalue base must be rvalue except for reference " "members, which aren't allowed for move assignment.") ? static_cast <void> (0) : __assert_fail ("!From.build(*this, Loc)->isLValue() && \"Member reference with rvalue base must be rvalue except for reference \" \"members, which aren't allowed for move assignment.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14529, __PRETTY_FUNCTION__)) | |||
14529 | "members, which aren't allowed for move assignment.")((!From.build(*this, Loc)->isLValue() && "Member reference with rvalue base must be rvalue except for reference " "members, which aren't allowed for move assignment.") ? static_cast <void> (0) : __assert_fail ("!From.build(*this, Loc)->isLValue() && \"Member reference with rvalue base must be rvalue except for reference \" \"members, which aren't allowed for move assignment.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14529, __PRETTY_FUNCTION__)); | |||
14530 | ||||
14531 | // Build the move of this field. | |||
14532 | StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType, | |||
14533 | To, From, | |||
14534 | /*CopyingBaseSubobject=*/false, | |||
14535 | /*Copying=*/false); | |||
14536 | if (Move.isInvalid()) { | |||
14537 | MoveAssignOperator->setInvalidDecl(); | |||
14538 | return; | |||
14539 | } | |||
14540 | ||||
14541 | // Success! Record the copy. | |||
14542 | Statements.push_back(Move.getAs<Stmt>()); | |||
14543 | } | |||
14544 | ||||
14545 | if (!Invalid) { | |||
14546 | // Add a "return *this;" | |||
14547 | ExprResult ThisObj = | |||
14548 | CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc)); | |||
14549 | ||||
14550 | StmtResult Return = BuildReturnStmt(Loc, ThisObj.get()); | |||
14551 | if (Return.isInvalid()) | |||
14552 | Invalid = true; | |||
14553 | else | |||
14554 | Statements.push_back(Return.getAs<Stmt>()); | |||
14555 | } | |||
14556 | ||||
14557 | if (Invalid) { | |||
14558 | MoveAssignOperator->setInvalidDecl(); | |||
14559 | return; | |||
14560 | } | |||
14561 | ||||
14562 | StmtResult Body; | |||
14563 | { | |||
14564 | CompoundScopeRAII CompoundScope(*this); | |||
14565 | Body = ActOnCompoundStmt(Loc, Loc, Statements, | |||
14566 | /*isStmtExpr=*/false); | |||
14567 | assert(!Body.isInvalid() && "Compound statement creation cannot fail")((!Body.isInvalid() && "Compound statement creation cannot fail" ) ? static_cast<void> (0) : __assert_fail ("!Body.isInvalid() && \"Compound statement creation cannot fail\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14567, __PRETTY_FUNCTION__)); | |||
14568 | } | |||
14569 | MoveAssignOperator->setBody(Body.getAs<Stmt>()); | |||
14570 | MoveAssignOperator->markUsed(Context); | |||
14571 | ||||
14572 | if (ASTMutationListener *L = getASTMutationListener()) { | |||
14573 | L->CompletedImplicitDefinition(MoveAssignOperator); | |||
14574 | } | |||
14575 | } | |||
14576 | ||||
14577 | CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( | |||
14578 | CXXRecordDecl *ClassDecl) { | |||
14579 | // C++ [class.copy]p4: | |||
14580 | // If the class definition does not explicitly declare a copy | |||
14581 | // constructor, one is declared implicitly. | |||
14582 | assert(ClassDecl->needsImplicitCopyConstructor())((ClassDecl->needsImplicitCopyConstructor()) ? static_cast <void> (0) : __assert_fail ("ClassDecl->needsImplicitCopyConstructor()" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14582, __PRETTY_FUNCTION__)); | |||
14583 | ||||
14584 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor); | |||
14585 | if (DSM.isAlreadyBeingDeclared()) | |||
14586 | return nullptr; | |||
14587 | ||||
14588 | QualType ClassType = Context.getTypeDeclType(ClassDecl); | |||
14589 | QualType ArgType = ClassType; | |||
14590 | bool Const = ClassDecl->implicitCopyConstructorHasConstParam(); | |||
14591 | if (Const) | |||
14592 | ArgType = ArgType.withConst(); | |||
14593 | ||||
14594 | LangAS AS = getDefaultCXXMethodAddrSpace(); | |||
14595 | if (AS != LangAS::Default) | |||
14596 | ArgType = Context.getAddrSpaceQualType(ArgType, AS); | |||
14597 | ||||
14598 | ArgType = Context.getLValueReferenceType(ArgType); | |||
14599 | ||||
14600 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, | |||
14601 | CXXCopyConstructor, | |||
14602 | Const); | |||
14603 | ||||
14604 | DeclarationName Name | |||
14605 | = Context.DeclarationNames.getCXXConstructorName( | |||
14606 | Context.getCanonicalType(ClassType)); | |||
14607 | SourceLocation ClassLoc = ClassDecl->getLocation(); | |||
14608 | DeclarationNameInfo NameInfo(Name, ClassLoc); | |||
14609 | ||||
14610 | // An implicitly-declared copy constructor is an inline public | |||
14611 | // member of its class. | |||
14612 | CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( | |||
14613 | Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/nullptr, | |||
14614 | ExplicitSpecifier(), | |||
14615 | /*isInline=*/true, | |||
14616 | /*isImplicitlyDeclared=*/true, | |||
14617 | Constexpr ? ConstexprSpecKind::Constexpr | |||
14618 | : ConstexprSpecKind::Unspecified); | |||
14619 | CopyConstructor->setAccess(AS_public); | |||
14620 | CopyConstructor->setDefaulted(); | |||
14621 | ||||
14622 | if (getLangOpts().CUDA) { | |||
14623 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXCopyConstructor, | |||
14624 | CopyConstructor, | |||
14625 | /* ConstRHS */ Const, | |||
14626 | /* Diagnose */ false); | |||
14627 | } | |||
14628 | ||||
14629 | setupImplicitSpecialMemberType(CopyConstructor, Context.VoidTy, ArgType); | |||
14630 | ||||
14631 | // Add the parameter to the constructor. | |||
14632 | ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, | |||
14633 | ClassLoc, ClassLoc, | |||
14634 | /*IdentifierInfo=*/nullptr, | |||
14635 | ArgType, /*TInfo=*/nullptr, | |||
14636 | SC_None, nullptr); | |||
14637 | CopyConstructor->setParams(FromParam); | |||
14638 | ||||
14639 | CopyConstructor->setTrivial( | |||
14640 | ClassDecl->needsOverloadResolutionForCopyConstructor() | |||
14641 | ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor) | |||
14642 | : ClassDecl->hasTrivialCopyConstructor()); | |||
14643 | ||||
14644 | CopyConstructor->setTrivialForCall( | |||
14645 | ClassDecl->hasAttr<TrivialABIAttr>() || | |||
14646 | (ClassDecl->needsOverloadResolutionForCopyConstructor() | |||
14647 | ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor, | |||
14648 | TAH_ConsiderTrivialABI) | |||
14649 | : ClassDecl->hasTrivialCopyConstructorForCall())); | |||
14650 | ||||
14651 | // Note that we have declared this constructor. | |||
14652 | ++getASTContext().NumImplicitCopyConstructorsDeclared; | |||
14653 | ||||
14654 | Scope *S = getScopeForContext(ClassDecl); | |||
14655 | CheckImplicitSpecialMemberDeclaration(S, CopyConstructor); | |||
14656 | ||||
14657 | if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) { | |||
14658 | ClassDecl->setImplicitCopyConstructorIsDeleted(); | |||
14659 | SetDeclDeleted(CopyConstructor, ClassLoc); | |||
14660 | } | |||
14661 | ||||
14662 | if (S) | |||
14663 | PushOnScopeChains(CopyConstructor, S, false); | |||
14664 | ClassDecl->addDecl(CopyConstructor); | |||
14665 | ||||
14666 | return CopyConstructor; | |||
14667 | } | |||
14668 | ||||
14669 | void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, | |||
14670 | CXXConstructorDecl *CopyConstructor) { | |||
14671 | assert((CopyConstructor->isDefaulted() &&(((CopyConstructor->isDefaulted() && CopyConstructor ->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody () && !CopyConstructor->isDeleted()) && "DefineImplicitCopyConstructor - call it for implicit copy ctor" ) ? static_cast<void> (0) : __assert_fail ("(CopyConstructor->isDefaulted() && CopyConstructor->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody() && !CopyConstructor->isDeleted()) && \"DefineImplicitCopyConstructor - call it for implicit copy ctor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14675, __PRETTY_FUNCTION__)) | |||
14672 | CopyConstructor->isCopyConstructor() &&(((CopyConstructor->isDefaulted() && CopyConstructor ->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody () && !CopyConstructor->isDeleted()) && "DefineImplicitCopyConstructor - call it for implicit copy ctor" ) ? static_cast<void> (0) : __assert_fail ("(CopyConstructor->isDefaulted() && CopyConstructor->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody() && !CopyConstructor->isDeleted()) && \"DefineImplicitCopyConstructor - call it for implicit copy ctor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14675, __PRETTY_FUNCTION__)) | |||
14673 | !CopyConstructor->doesThisDeclarationHaveABody() &&(((CopyConstructor->isDefaulted() && CopyConstructor ->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody () && !CopyConstructor->isDeleted()) && "DefineImplicitCopyConstructor - call it for implicit copy ctor" ) ? static_cast<void> (0) : __assert_fail ("(CopyConstructor->isDefaulted() && CopyConstructor->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody() && !CopyConstructor->isDeleted()) && \"DefineImplicitCopyConstructor - call it for implicit copy ctor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14675, __PRETTY_FUNCTION__)) | |||
14674 | !CopyConstructor->isDeleted()) &&(((CopyConstructor->isDefaulted() && CopyConstructor ->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody () && !CopyConstructor->isDeleted()) && "DefineImplicitCopyConstructor - call it for implicit copy ctor" ) ? static_cast<void> (0) : __assert_fail ("(CopyConstructor->isDefaulted() && CopyConstructor->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody() && !CopyConstructor->isDeleted()) && \"DefineImplicitCopyConstructor - call it for implicit copy ctor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14675, __PRETTY_FUNCTION__)) | |||
14675 | "DefineImplicitCopyConstructor - call it for implicit copy ctor")(((CopyConstructor->isDefaulted() && CopyConstructor ->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody () && !CopyConstructor->isDeleted()) && "DefineImplicitCopyConstructor - call it for implicit copy ctor" ) ? static_cast<void> (0) : __assert_fail ("(CopyConstructor->isDefaulted() && CopyConstructor->isCopyConstructor() && !CopyConstructor->doesThisDeclarationHaveABody() && !CopyConstructor->isDeleted()) && \"DefineImplicitCopyConstructor - call it for implicit copy ctor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14675, __PRETTY_FUNCTION__)); | |||
14676 | if (CopyConstructor->willHaveBody() || CopyConstructor->isInvalidDecl()) | |||
14677 | return; | |||
14678 | ||||
14679 | CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); | |||
14680 | assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor")((ClassDecl && "DefineImplicitCopyConstructor - invalid constructor" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl && \"DefineImplicitCopyConstructor - invalid constructor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14680, __PRETTY_FUNCTION__)); | |||
14681 | ||||
14682 | SynthesizedFunctionScope Scope(*this, CopyConstructor); | |||
14683 | ||||
14684 | // The exception specification is needed because we are defining the | |||
14685 | // function. | |||
14686 | ResolveExceptionSpec(CurrentLocation, | |||
14687 | CopyConstructor->getType()->castAs<FunctionProtoType>()); | |||
14688 | MarkVTableUsed(CurrentLocation, ClassDecl); | |||
14689 | ||||
14690 | // Add a context note for diagnostics produced after this point. | |||
14691 | Scope.addContextNote(CurrentLocation); | |||
14692 | ||||
14693 | // C++11 [class.copy]p7: | |||
14694 | // The [definition of an implicitly declared copy constructor] is | |||
14695 | // deprecated if the class has a user-declared copy assignment operator | |||
14696 | // or a user-declared destructor. | |||
14697 | if (getLangOpts().CPlusPlus11 && CopyConstructor->isImplicit()) | |||
14698 | diagnoseDeprecatedCopyOperation(*this, CopyConstructor); | |||
14699 | ||||
14700 | if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false)) { | |||
14701 | CopyConstructor->setInvalidDecl(); | |||
14702 | } else { | |||
14703 | SourceLocation Loc = CopyConstructor->getEndLoc().isValid() | |||
14704 | ? CopyConstructor->getEndLoc() | |||
14705 | : CopyConstructor->getLocation(); | |||
14706 | Sema::CompoundScopeRAII CompoundScope(*this); | |||
14707 | CopyConstructor->setBody( | |||
14708 | ActOnCompoundStmt(Loc, Loc, None, /*isStmtExpr=*/false).getAs<Stmt>()); | |||
14709 | CopyConstructor->markUsed(Context); | |||
14710 | } | |||
14711 | ||||
14712 | if (ASTMutationListener *L = getASTMutationListener()) { | |||
14713 | L->CompletedImplicitDefinition(CopyConstructor); | |||
14714 | } | |||
14715 | } | |||
14716 | ||||
14717 | CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( | |||
14718 | CXXRecordDecl *ClassDecl) { | |||
14719 | assert(ClassDecl->needsImplicitMoveConstructor())((ClassDecl->needsImplicitMoveConstructor()) ? static_cast <void> (0) : __assert_fail ("ClassDecl->needsImplicitMoveConstructor()" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14719, __PRETTY_FUNCTION__)); | |||
14720 | ||||
14721 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor); | |||
14722 | if (DSM.isAlreadyBeingDeclared()) | |||
14723 | return nullptr; | |||
14724 | ||||
14725 | QualType ClassType = Context.getTypeDeclType(ClassDecl); | |||
14726 | ||||
14727 | QualType ArgType = ClassType; | |||
14728 | LangAS AS = getDefaultCXXMethodAddrSpace(); | |||
14729 | if (AS != LangAS::Default) | |||
14730 | ArgType = Context.getAddrSpaceQualType(ClassType, AS); | |||
14731 | ArgType = Context.getRValueReferenceType(ArgType); | |||
14732 | ||||
14733 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, | |||
14734 | CXXMoveConstructor, | |||
14735 | false); | |||
14736 | ||||
14737 | DeclarationName Name | |||
14738 | = Context.DeclarationNames.getCXXConstructorName( | |||
14739 | Context.getCanonicalType(ClassType)); | |||
14740 | SourceLocation ClassLoc = ClassDecl->getLocation(); | |||
14741 | DeclarationNameInfo NameInfo(Name, ClassLoc); | |||
14742 | ||||
14743 | // C++11 [class.copy]p11: | |||
14744 | // An implicitly-declared copy/move constructor is an inline public | |||
14745 | // member of its class. | |||
14746 | CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( | |||
14747 | Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/nullptr, | |||
14748 | ExplicitSpecifier(), | |||
14749 | /*isInline=*/true, | |||
14750 | /*isImplicitlyDeclared=*/true, | |||
14751 | Constexpr ? ConstexprSpecKind::Constexpr | |||
14752 | : ConstexprSpecKind::Unspecified); | |||
14753 | MoveConstructor->setAccess(AS_public); | |||
14754 | MoveConstructor->setDefaulted(); | |||
14755 | ||||
14756 | if (getLangOpts().CUDA) { | |||
14757 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXMoveConstructor, | |||
14758 | MoveConstructor, | |||
14759 | /* ConstRHS */ false, | |||
14760 | /* Diagnose */ false); | |||
14761 | } | |||
14762 | ||||
14763 | setupImplicitSpecialMemberType(MoveConstructor, Context.VoidTy, ArgType); | |||
14764 | ||||
14765 | // Add the parameter to the constructor. | |||
14766 | ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, | |||
14767 | ClassLoc, ClassLoc, | |||
14768 | /*IdentifierInfo=*/nullptr, | |||
14769 | ArgType, /*TInfo=*/nullptr, | |||
14770 | SC_None, nullptr); | |||
14771 | MoveConstructor->setParams(FromParam); | |||
14772 | ||||
14773 | MoveConstructor->setTrivial( | |||
14774 | ClassDecl->needsOverloadResolutionForMoveConstructor() | |||
14775 | ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor) | |||
14776 | : ClassDecl->hasTrivialMoveConstructor()); | |||
14777 | ||||
14778 | MoveConstructor->setTrivialForCall( | |||
14779 | ClassDecl->hasAttr<TrivialABIAttr>() || | |||
14780 | (ClassDecl->needsOverloadResolutionForMoveConstructor() | |||
14781 | ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor, | |||
14782 | TAH_ConsiderTrivialABI) | |||
14783 | : ClassDecl->hasTrivialMoveConstructorForCall())); | |||
14784 | ||||
14785 | // Note that we have declared this constructor. | |||
14786 | ++getASTContext().NumImplicitMoveConstructorsDeclared; | |||
14787 | ||||
14788 | Scope *S = getScopeForContext(ClassDecl); | |||
14789 | CheckImplicitSpecialMemberDeclaration(S, MoveConstructor); | |||
14790 | ||||
14791 | if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { | |||
14792 | ClassDecl->setImplicitMoveConstructorIsDeleted(); | |||
14793 | SetDeclDeleted(MoveConstructor, ClassLoc); | |||
14794 | } | |||
14795 | ||||
14796 | if (S) | |||
14797 | PushOnScopeChains(MoveConstructor, S, false); | |||
14798 | ClassDecl->addDecl(MoveConstructor); | |||
14799 | ||||
14800 | return MoveConstructor; | |||
14801 | } | |||
14802 | ||||
14803 | void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, | |||
14804 | CXXConstructorDecl *MoveConstructor) { | |||
14805 | assert((MoveConstructor->isDefaulted() &&(((MoveConstructor->isDefaulted() && MoveConstructor ->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody () && !MoveConstructor->isDeleted()) && "DefineImplicitMoveConstructor - call it for implicit move ctor" ) ? static_cast<void> (0) : __assert_fail ("(MoveConstructor->isDefaulted() && MoveConstructor->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody() && !MoveConstructor->isDeleted()) && \"DefineImplicitMoveConstructor - call it for implicit move ctor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14809, __PRETTY_FUNCTION__)) | |||
14806 | MoveConstructor->isMoveConstructor() &&(((MoveConstructor->isDefaulted() && MoveConstructor ->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody () && !MoveConstructor->isDeleted()) && "DefineImplicitMoveConstructor - call it for implicit move ctor" ) ? static_cast<void> (0) : __assert_fail ("(MoveConstructor->isDefaulted() && MoveConstructor->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody() && !MoveConstructor->isDeleted()) && \"DefineImplicitMoveConstructor - call it for implicit move ctor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14809, __PRETTY_FUNCTION__)) | |||
14807 | !MoveConstructor->doesThisDeclarationHaveABody() &&(((MoveConstructor->isDefaulted() && MoveConstructor ->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody () && !MoveConstructor->isDeleted()) && "DefineImplicitMoveConstructor - call it for implicit move ctor" ) ? static_cast<void> (0) : __assert_fail ("(MoveConstructor->isDefaulted() && MoveConstructor->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody() && !MoveConstructor->isDeleted()) && \"DefineImplicitMoveConstructor - call it for implicit move ctor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14809, __PRETTY_FUNCTION__)) | |||
14808 | !MoveConstructor->isDeleted()) &&(((MoveConstructor->isDefaulted() && MoveConstructor ->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody () && !MoveConstructor->isDeleted()) && "DefineImplicitMoveConstructor - call it for implicit move ctor" ) ? static_cast<void> (0) : __assert_fail ("(MoveConstructor->isDefaulted() && MoveConstructor->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody() && !MoveConstructor->isDeleted()) && \"DefineImplicitMoveConstructor - call it for implicit move ctor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14809, __PRETTY_FUNCTION__)) | |||
14809 | "DefineImplicitMoveConstructor - call it for implicit move ctor")(((MoveConstructor->isDefaulted() && MoveConstructor ->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody () && !MoveConstructor->isDeleted()) && "DefineImplicitMoveConstructor - call it for implicit move ctor" ) ? static_cast<void> (0) : __assert_fail ("(MoveConstructor->isDefaulted() && MoveConstructor->isMoveConstructor() && !MoveConstructor->doesThisDeclarationHaveABody() && !MoveConstructor->isDeleted()) && \"DefineImplicitMoveConstructor - call it for implicit move ctor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14809, __PRETTY_FUNCTION__)); | |||
14810 | if (MoveConstructor->willHaveBody() || MoveConstructor->isInvalidDecl()) | |||
14811 | return; | |||
14812 | ||||
14813 | CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); | |||
14814 | assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor")((ClassDecl && "DefineImplicitMoveConstructor - invalid constructor" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl && \"DefineImplicitMoveConstructor - invalid constructor\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14814, __PRETTY_FUNCTION__)); | |||
14815 | ||||
14816 | SynthesizedFunctionScope Scope(*this, MoveConstructor); | |||
14817 | ||||
14818 | // The exception specification is needed because we are defining the | |||
14819 | // function. | |||
14820 | ResolveExceptionSpec(CurrentLocation, | |||
14821 | MoveConstructor->getType()->castAs<FunctionProtoType>()); | |||
14822 | MarkVTableUsed(CurrentLocation, ClassDecl); | |||
14823 | ||||
14824 | // Add a context note for diagnostics produced after this point. | |||
14825 | Scope.addContextNote(CurrentLocation); | |||
14826 | ||||
14827 | if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false)) { | |||
14828 | MoveConstructor->setInvalidDecl(); | |||
14829 | } else { | |||
14830 | SourceLocation Loc = MoveConstructor->getEndLoc().isValid() | |||
14831 | ? MoveConstructor->getEndLoc() | |||
14832 | : MoveConstructor->getLocation(); | |||
14833 | Sema::CompoundScopeRAII CompoundScope(*this); | |||
14834 | MoveConstructor->setBody(ActOnCompoundStmt( | |||
14835 | Loc, Loc, None, /*isStmtExpr=*/ false).getAs<Stmt>()); | |||
14836 | MoveConstructor->markUsed(Context); | |||
14837 | } | |||
14838 | ||||
14839 | if (ASTMutationListener *L = getASTMutationListener()) { | |||
14840 | L->CompletedImplicitDefinition(MoveConstructor); | |||
14841 | } | |||
14842 | } | |||
14843 | ||||
14844 | bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { | |||
14845 | return FD->isDeleted() && FD->isDefaulted() && isa<CXXMethodDecl>(FD); | |||
14846 | } | |||
14847 | ||||
14848 | void Sema::DefineImplicitLambdaToFunctionPointerConversion( | |||
14849 | SourceLocation CurrentLocation, | |||
14850 | CXXConversionDecl *Conv) { | |||
14851 | SynthesizedFunctionScope Scope(*this, Conv); | |||
14852 | assert(!Conv->getReturnType()->isUndeducedType())((!Conv->getReturnType()->isUndeducedType()) ? static_cast <void> (0) : __assert_fail ("!Conv->getReturnType()->isUndeducedType()" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14852, __PRETTY_FUNCTION__)); | |||
14853 | ||||
14854 | QualType ConvRT = Conv->getType()->getAs<FunctionType>()->getReturnType(); | |||
14855 | CallingConv CC = | |||
14856 | ConvRT->getPointeeType()->getAs<FunctionType>()->getCallConv(); | |||
14857 | ||||
14858 | CXXRecordDecl *Lambda = Conv->getParent(); | |||
14859 | FunctionDecl *CallOp = Lambda->getLambdaCallOperator(); | |||
14860 | FunctionDecl *Invoker = Lambda->getLambdaStaticInvoker(CC); | |||
14861 | ||||
14862 | if (auto *TemplateArgs = Conv->getTemplateSpecializationArgs()) { | |||
14863 | CallOp = InstantiateFunctionDeclaration( | |||
14864 | CallOp->getDescribedFunctionTemplate(), TemplateArgs, CurrentLocation); | |||
14865 | if (!CallOp) | |||
14866 | return; | |||
14867 | ||||
14868 | Invoker = InstantiateFunctionDeclaration( | |||
14869 | Invoker->getDescribedFunctionTemplate(), TemplateArgs, CurrentLocation); | |||
14870 | if (!Invoker) | |||
14871 | return; | |||
14872 | } | |||
14873 | ||||
14874 | if (CallOp->isInvalidDecl()) | |||
14875 | return; | |||
14876 | ||||
14877 | // Mark the call operator referenced (and add to pending instantiations | |||
14878 | // if necessary). | |||
14879 | // For both the conversion and static-invoker template specializations | |||
14880 | // we construct their body's in this function, so no need to add them | |||
14881 | // to the PendingInstantiations. | |||
14882 | MarkFunctionReferenced(CurrentLocation, CallOp); | |||
14883 | ||||
14884 | // Fill in the __invoke function with a dummy implementation. IR generation | |||
14885 | // will fill in the actual details. Update its type in case it contained | |||
14886 | // an 'auto'. | |||
14887 | Invoker->markUsed(Context); | |||
14888 | Invoker->setReferenced(); | |||
14889 | Invoker->setType(Conv->getReturnType()->getPointeeType()); | |||
14890 | Invoker->setBody(new (Context) CompoundStmt(Conv->getLocation())); | |||
14891 | ||||
14892 | // Construct the body of the conversion function { return __invoke; }. | |||
14893 | Expr *FunctionRef = BuildDeclRefExpr(Invoker, Invoker->getType(), | |||
14894 | VK_LValue, Conv->getLocation()); | |||
14895 | assert(FunctionRef && "Can't refer to __invoke function?")((FunctionRef && "Can't refer to __invoke function?") ? static_cast<void> (0) : __assert_fail ("FunctionRef && \"Can't refer to __invoke function?\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14895, __PRETTY_FUNCTION__)); | |||
14896 | Stmt *Return = BuildReturnStmt(Conv->getLocation(), FunctionRef).get(); | |||
14897 | Conv->setBody(CompoundStmt::Create(Context, Return, Conv->getLocation(), | |||
14898 | Conv->getLocation())); | |||
14899 | Conv->markUsed(Context); | |||
14900 | Conv->setReferenced(); | |||
14901 | ||||
14902 | if (ASTMutationListener *L = getASTMutationListener()) { | |||
14903 | L->CompletedImplicitDefinition(Conv); | |||
14904 | L->CompletedImplicitDefinition(Invoker); | |||
14905 | } | |||
14906 | } | |||
14907 | ||||
14908 | ||||
14909 | ||||
14910 | void Sema::DefineImplicitLambdaToBlockPointerConversion( | |||
14911 | SourceLocation CurrentLocation, | |||
14912 | CXXConversionDecl *Conv) | |||
14913 | { | |||
14914 | assert(!Conv->getParent()->isGenericLambda())((!Conv->getParent()->isGenericLambda()) ? static_cast< void> (0) : __assert_fail ("!Conv->getParent()->isGenericLambda()" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 14914, __PRETTY_FUNCTION__)); | |||
14915 | ||||
14916 | SynthesizedFunctionScope Scope(*this, Conv); | |||
14917 | ||||
14918 | // Copy-initialize the lambda object as needed to capture it. | |||
14919 | Expr *This = ActOnCXXThis(CurrentLocation).get(); | |||
14920 | Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).get(); | |||
14921 | ||||
14922 | ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, | |||
14923 | Conv->getLocation(), | |||
14924 | Conv, DerefThis); | |||
14925 | ||||
14926 | // If we're not under ARC, make sure we still get the _Block_copy/autorelease | |||
14927 | // behavior. Note that only the general conversion function does this | |||
14928 | // (since it's unusable otherwise); in the case where we inline the | |||
14929 | // block literal, it has block literal lifetime semantics. | |||
14930 | if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) | |||
14931 | BuildBlock = ImplicitCastExpr::Create( | |||
14932 | Context, BuildBlock.get()->getType(), CK_CopyAndAutoreleaseBlockObject, | |||
14933 | BuildBlock.get(), nullptr, VK_RValue, FPOptionsOverride()); | |||
14934 | ||||
14935 | if (BuildBlock.isInvalid()) { | |||
14936 | Diag(CurrentLocation, diag::note_lambda_to_block_conv); | |||
14937 | Conv->setInvalidDecl(); | |||
14938 | return; | |||
14939 | } | |||
14940 | ||||
14941 | // Create the return statement that returns the block from the conversion | |||
14942 | // function. | |||
14943 | StmtResult Return = BuildReturnStmt(Conv->getLocation(), BuildBlock.get()); | |||
14944 | if (Return.isInvalid()) { | |||
14945 | Diag(CurrentLocation, diag::note_lambda_to_block_conv); | |||
14946 | Conv->setInvalidDecl(); | |||
14947 | return; | |||
14948 | } | |||
14949 | ||||
14950 | // Set the body of the conversion function. | |||
14951 | Stmt *ReturnS = Return.get(); | |||
14952 | Conv->setBody(CompoundStmt::Create(Context, ReturnS, Conv->getLocation(), | |||
14953 | Conv->getLocation())); | |||
14954 | Conv->markUsed(Context); | |||
14955 | ||||
14956 | // We're done; notify the mutation listener, if any. | |||
14957 | if (ASTMutationListener *L = getASTMutationListener()) { | |||
14958 | L->CompletedImplicitDefinition(Conv); | |||
14959 | } | |||
14960 | } | |||
14961 | ||||
14962 | /// Determine whether the given list arguments contains exactly one | |||
14963 | /// "real" (non-default) argument. | |||
14964 | static bool hasOneRealArgument(MultiExprArg Args) { | |||
14965 | switch (Args.size()) { | |||
14966 | case 0: | |||
14967 | return false; | |||
14968 | ||||
14969 | default: | |||
14970 | if (!Args[1]->isDefaultArgument()) | |||
14971 | return false; | |||
14972 | ||||
14973 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
14974 | case 1: | |||
14975 | return !Args[0]->isDefaultArgument(); | |||
14976 | } | |||
14977 | ||||
14978 | return false; | |||
14979 | } | |||
14980 | ||||
14981 | ExprResult | |||
14982 | Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, | |||
14983 | NamedDecl *FoundDecl, | |||
14984 | CXXConstructorDecl *Constructor, | |||
14985 | MultiExprArg ExprArgs, | |||
14986 | bool HadMultipleCandidates, | |||
14987 | bool IsListInitialization, | |||
14988 | bool IsStdInitListInitialization, | |||
14989 | bool RequiresZeroInit, | |||
14990 | unsigned ConstructKind, | |||
14991 | SourceRange ParenRange) { | |||
14992 | bool Elidable = false; | |||
14993 | ||||
14994 | // C++0x [class.copy]p34: | |||
14995 | // When certain criteria are met, an implementation is allowed to | |||
14996 | // omit the copy/move construction of a class object, even if the | |||
14997 | // copy/move constructor and/or destructor for the object have | |||
14998 | // side effects. [...] | |||
14999 | // - when a temporary class object that has not been bound to a | |||
15000 | // reference (12.2) would be copied/moved to a class object | |||
15001 | // with the same cv-unqualified type, the copy/move operation | |||
15002 | // can be omitted by constructing the temporary object | |||
15003 | // directly into the target of the omitted copy/move | |||
15004 | if (ConstructKind == CXXConstructExpr::CK_Complete && Constructor && | |||
15005 | Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { | |||
15006 | Expr *SubExpr = ExprArgs[0]; | |||
15007 | Elidable = SubExpr->isTemporaryObject( | |||
15008 | Context, cast<CXXRecordDecl>(FoundDecl->getDeclContext())); | |||
15009 | } | |||
15010 | ||||
15011 | return BuildCXXConstructExpr(ConstructLoc, DeclInitType, | |||
15012 | FoundDecl, Constructor, | |||
15013 | Elidable, ExprArgs, HadMultipleCandidates, | |||
15014 | IsListInitialization, | |||
15015 | IsStdInitListInitialization, RequiresZeroInit, | |||
15016 | ConstructKind, ParenRange); | |||
15017 | } | |||
15018 | ||||
15019 | ExprResult | |||
15020 | Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, | |||
15021 | NamedDecl *FoundDecl, | |||
15022 | CXXConstructorDecl *Constructor, | |||
15023 | bool Elidable, | |||
15024 | MultiExprArg ExprArgs, | |||
15025 | bool HadMultipleCandidates, | |||
15026 | bool IsListInitialization, | |||
15027 | bool IsStdInitListInitialization, | |||
15028 | bool RequiresZeroInit, | |||
15029 | unsigned ConstructKind, | |||
15030 | SourceRange ParenRange) { | |||
15031 | if (auto *Shadow = dyn_cast<ConstructorUsingShadowDecl>(FoundDecl)) { | |||
15032 | Constructor = findInheritingConstructor(ConstructLoc, Constructor, Shadow); | |||
15033 | if (DiagnoseUseOfDecl(Constructor, ConstructLoc)) | |||
15034 | return ExprError(); | |||
15035 | } | |||
15036 | ||||
15037 | return BuildCXXConstructExpr( | |||
15038 | ConstructLoc, DeclInitType, Constructor, Elidable, ExprArgs, | |||
15039 | HadMultipleCandidates, IsListInitialization, IsStdInitListInitialization, | |||
15040 | RequiresZeroInit, ConstructKind, ParenRange); | |||
15041 | } | |||
15042 | ||||
15043 | /// BuildCXXConstructExpr - Creates a complete call to a constructor, | |||
15044 | /// including handling of its default argument expressions. | |||
15045 | ExprResult | |||
15046 | Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, | |||
15047 | CXXConstructorDecl *Constructor, | |||
15048 | bool Elidable, | |||
15049 | MultiExprArg ExprArgs, | |||
15050 | bool HadMultipleCandidates, | |||
15051 | bool IsListInitialization, | |||
15052 | bool IsStdInitListInitialization, | |||
15053 | bool RequiresZeroInit, | |||
15054 | unsigned ConstructKind, | |||
15055 | SourceRange ParenRange) { | |||
15056 | assert(declaresSameEntity(((declaresSameEntity( Constructor->getParent(), DeclInitType ->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) && "given constructor for wrong type") ? static_cast<void> (0) : __assert_fail ("declaresSameEntity( Constructor->getParent(), DeclInitType->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) && \"given constructor for wrong type\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 15059, __PRETTY_FUNCTION__)) | |||
15057 | Constructor->getParent(),((declaresSameEntity( Constructor->getParent(), DeclInitType ->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) && "given constructor for wrong type") ? static_cast<void> (0) : __assert_fail ("declaresSameEntity( Constructor->getParent(), DeclInitType->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) && \"given constructor for wrong type\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 15059, __PRETTY_FUNCTION__)) | |||
15058 | DeclInitType->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) &&((declaresSameEntity( Constructor->getParent(), DeclInitType ->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) && "given constructor for wrong type") ? static_cast<void> (0) : __assert_fail ("declaresSameEntity( Constructor->getParent(), DeclInitType->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) && \"given constructor for wrong type\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 15059, __PRETTY_FUNCTION__)) | |||
15059 | "given constructor for wrong type")((declaresSameEntity( Constructor->getParent(), DeclInitType ->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) && "given constructor for wrong type") ? static_cast<void> (0) : __assert_fail ("declaresSameEntity( Constructor->getParent(), DeclInitType->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) && \"given constructor for wrong type\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 15059, __PRETTY_FUNCTION__)); | |||
15060 | MarkFunctionReferenced(ConstructLoc, Constructor); | |||
15061 | if (getLangOpts().CUDA && !CheckCUDACall(ConstructLoc, Constructor)) | |||
15062 | return ExprError(); | |||
15063 | if (getLangOpts().SYCLIsDevice && | |||
15064 | !checkSYCLDeviceFunction(ConstructLoc, Constructor)) | |||
15065 | return ExprError(); | |||
15066 | ||||
15067 | return CheckForImmediateInvocation( | |||
15068 | CXXConstructExpr::Create( | |||
15069 | Context, DeclInitType, ConstructLoc, Constructor, Elidable, ExprArgs, | |||
15070 | HadMultipleCandidates, IsListInitialization, | |||
15071 | IsStdInitListInitialization, RequiresZeroInit, | |||
15072 | static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), | |||
15073 | ParenRange), | |||
15074 | Constructor); | |||
15075 | } | |||
15076 | ||||
15077 | ExprResult Sema::BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field) { | |||
15078 | assert(Field->hasInClassInitializer())((Field->hasInClassInitializer()) ? static_cast<void> (0) : __assert_fail ("Field->hasInClassInitializer()", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 15078, __PRETTY_FUNCTION__)); | |||
15079 | ||||
15080 | // If we already have the in-class initializer nothing needs to be done. | |||
15081 | if (Field->getInClassInitializer()) | |||
15082 | return CXXDefaultInitExpr::Create(Context, Loc, Field, CurContext); | |||
15083 | ||||
15084 | // If we might have already tried and failed to instantiate, don't try again. | |||
15085 | if (Field->isInvalidDecl()) | |||
15086 | return ExprError(); | |||
15087 | ||||
15088 | // Maybe we haven't instantiated the in-class initializer. Go check the | |||
15089 | // pattern FieldDecl to see if it has one. | |||
15090 | CXXRecordDecl *ParentRD = cast<CXXRecordDecl>(Field->getParent()); | |||
15091 | ||||
15092 | if (isTemplateInstantiation(ParentRD->getTemplateSpecializationKind())) { | |||
15093 | CXXRecordDecl *ClassPattern = ParentRD->getTemplateInstantiationPattern(); | |||
15094 | DeclContext::lookup_result Lookup = | |||
15095 | ClassPattern->lookup(Field->getDeclName()); | |||
15096 | ||||
15097 | FieldDecl *Pattern = nullptr; | |||
15098 | for (auto L : Lookup) { | |||
15099 | if (isa<FieldDecl>(L)) { | |||
15100 | Pattern = cast<FieldDecl>(L); | |||
15101 | break; | |||
15102 | } | |||
15103 | } | |||
15104 | assert(Pattern && "We must have set the Pattern!")((Pattern && "We must have set the Pattern!") ? static_cast <void> (0) : __assert_fail ("Pattern && \"We must have set the Pattern!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 15104, __PRETTY_FUNCTION__)); | |||
15105 | ||||
15106 | if (!Pattern->hasInClassInitializer() || | |||
15107 | InstantiateInClassInitializer(Loc, Field, Pattern, | |||
15108 | getTemplateInstantiationArgs(Field))) { | |||
15109 | // Don't diagnose this again. | |||
15110 | Field->setInvalidDecl(); | |||
15111 | return ExprError(); | |||
15112 | } | |||
15113 | return CXXDefaultInitExpr::Create(Context, Loc, Field, CurContext); | |||
15114 | } | |||
15115 | ||||
15116 | // DR1351: | |||
15117 | // If the brace-or-equal-initializer of a non-static data member | |||
15118 | // invokes a defaulted default constructor of its class or of an | |||
15119 | // enclosing class in a potentially evaluated subexpression, the | |||
15120 | // program is ill-formed. | |||
15121 | // | |||
15122 | // This resolution is unworkable: the exception specification of the | |||
15123 | // default constructor can be needed in an unevaluated context, in | |||
15124 | // particular, in the operand of a noexcept-expression, and we can be | |||
15125 | // unable to compute an exception specification for an enclosed class. | |||
15126 | // | |||
15127 | // Any attempt to resolve the exception specification of a defaulted default | |||
15128 | // constructor before the initializer is lexically complete will ultimately | |||
15129 | // come here at which point we can diagnose it. | |||
15130 | RecordDecl *OutermostClass = ParentRD->getOuterLexicalRecordContext(); | |||
15131 | Diag(Loc, diag::err_default_member_initializer_not_yet_parsed) | |||
15132 | << OutermostClass << Field; | |||
15133 | Diag(Field->getEndLoc(), | |||
15134 | diag::note_default_member_initializer_not_yet_parsed); | |||
15135 | // Recover by marking the field invalid, unless we're in a SFINAE context. | |||
15136 | if (!isSFINAEContext()) | |||
15137 | Field->setInvalidDecl(); | |||
15138 | return ExprError(); | |||
15139 | } | |||
15140 | ||||
15141 | void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { | |||
15142 | if (VD->isInvalidDecl()) return; | |||
15143 | // If initializing the variable failed, don't also diagnose problems with | |||
15144 | // the desctructor, they're likely related. | |||
15145 | if (VD->getInit() && VD->getInit()->containsErrors()) | |||
15146 | return; | |||
15147 | ||||
15148 | CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); | |||
15149 | if (ClassDecl->isInvalidDecl()) return; | |||
15150 | if (ClassDecl->hasIrrelevantDestructor()) return; | |||
15151 | if (ClassDecl->isDependentContext()) return; | |||
15152 | ||||
15153 | if (VD->isNoDestroy(getASTContext())) | |||
15154 | return; | |||
15155 | ||||
15156 | CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); | |||
15157 | ||||
15158 | // If this is an array, we'll require the destructor during initialization, so | |||
15159 | // we can skip over this. We still want to emit exit-time destructor warnings | |||
15160 | // though. | |||
15161 | if (!VD->getType()->isArrayType()) { | |||
15162 | MarkFunctionReferenced(VD->getLocation(), Destructor); | |||
15163 | CheckDestructorAccess(VD->getLocation(), Destructor, | |||
15164 | PDiag(diag::err_access_dtor_var) | |||
15165 | << VD->getDeclName() << VD->getType()); | |||
15166 | DiagnoseUseOfDecl(Destructor, VD->getLocation()); | |||
15167 | } | |||
15168 | ||||
15169 | if (Destructor->isTrivial()) return; | |||
15170 | ||||
15171 | // If the destructor is constexpr, check whether the variable has constant | |||
15172 | // destruction now. | |||
15173 | if (Destructor->isConstexpr()) { | |||
15174 | bool HasConstantInit = false; | |||
15175 | if (VD->getInit() && !VD->getInit()->isValueDependent()) | |||
15176 | HasConstantInit = VD->evaluateValue(); | |||
15177 | SmallVector<PartialDiagnosticAt, 8> Notes; | |||
15178 | if (!VD->evaluateDestruction(Notes) && VD->isConstexpr() && | |||
15179 | HasConstantInit) { | |||
15180 | Diag(VD->getLocation(), | |||
15181 | diag::err_constexpr_var_requires_const_destruction) << VD; | |||
15182 | for (unsigned I = 0, N = Notes.size(); I != N; ++I) | |||
15183 | Diag(Notes[I].first, Notes[I].second); | |||
15184 | } | |||
15185 | } | |||
15186 | ||||
15187 | if (!VD->hasGlobalStorage()) return; | |||
15188 | ||||
15189 | // Emit warning for non-trivial dtor in global scope (a real global, | |||
15190 | // class-static, function-static). | |||
15191 | Diag(VD->getLocation(), diag::warn_exit_time_destructor); | |||
15192 | ||||
15193 | // TODO: this should be re-enabled for static locals by !CXAAtExit | |||
15194 | if (!VD->isStaticLocal()) | |||
15195 | Diag(VD->getLocation(), diag::warn_global_destructor); | |||
15196 | } | |||
15197 | ||||
15198 | /// Given a constructor and the set of arguments provided for the | |||
15199 | /// constructor, convert the arguments and add any required default arguments | |||
15200 | /// to form a proper call to this constructor. | |||
15201 | /// | |||
15202 | /// \returns true if an error occurred, false otherwise. | |||
15203 | bool | |||
15204 | Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, | |||
15205 | MultiExprArg ArgsPtr, | |||
15206 | SourceLocation Loc, | |||
15207 | SmallVectorImpl<Expr*> &ConvertedArgs, | |||
15208 | bool AllowExplicit, | |||
15209 | bool IsListInitialization) { | |||
15210 | // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. | |||
15211 | unsigned NumArgs = ArgsPtr.size(); | |||
15212 | Expr **Args = ArgsPtr.data(); | |||
15213 | ||||
15214 | const auto *Proto = Constructor->getType()->castAs<FunctionProtoType>(); | |||
15215 | unsigned NumParams = Proto->getNumParams(); | |||
15216 | ||||
15217 | // If too few arguments are available, we'll fill in the rest with defaults. | |||
15218 | if (NumArgs < NumParams) | |||
15219 | ConvertedArgs.reserve(NumParams); | |||
15220 | else | |||
15221 | ConvertedArgs.reserve(NumArgs); | |||
15222 | ||||
15223 | VariadicCallType CallType = | |||
15224 | Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; | |||
15225 | SmallVector<Expr *, 8> AllArgs; | |||
15226 | bool Invalid = GatherArgumentsForCall(Loc, Constructor, | |||
15227 | Proto, 0, | |||
15228 | llvm::makeArrayRef(Args, NumArgs), | |||
15229 | AllArgs, | |||
15230 | CallType, AllowExplicit, | |||
15231 | IsListInitialization); | |||
15232 | ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); | |||
15233 | ||||
15234 | DiagnoseSentinelCalls(Constructor, Loc, AllArgs); | |||
15235 | ||||
15236 | CheckConstructorCall(Constructor, | |||
15237 | llvm::makeArrayRef(AllArgs.data(), AllArgs.size()), | |||
15238 | Proto, Loc); | |||
15239 | ||||
15240 | return Invalid; | |||
15241 | } | |||
15242 | ||||
15243 | static inline bool | |||
15244 | CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, | |||
15245 | const FunctionDecl *FnDecl) { | |||
15246 | const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); | |||
15247 | if (isa<NamespaceDecl>(DC)) { | |||
15248 | return SemaRef.Diag(FnDecl->getLocation(), | |||
15249 | diag::err_operator_new_delete_declared_in_namespace) | |||
15250 | << FnDecl->getDeclName(); | |||
15251 | } | |||
15252 | ||||
15253 | if (isa<TranslationUnitDecl>(DC) && | |||
15254 | FnDecl->getStorageClass() == SC_Static) { | |||
15255 | return SemaRef.Diag(FnDecl->getLocation(), | |||
15256 | diag::err_operator_new_delete_declared_static) | |||
15257 | << FnDecl->getDeclName(); | |||
15258 | } | |||
15259 | ||||
15260 | return false; | |||
15261 | } | |||
15262 | ||||
15263 | static QualType | |||
15264 | RemoveAddressSpaceFromPtr(Sema &SemaRef, const PointerType *PtrTy) { | |||
15265 | QualType QTy = PtrTy->getPointeeType(); | |||
15266 | QTy = SemaRef.Context.removeAddrSpaceQualType(QTy); | |||
15267 | return SemaRef.Context.getPointerType(QTy); | |||
15268 | } | |||
15269 | ||||
15270 | static inline bool | |||
15271 | CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, | |||
15272 | CanQualType ExpectedResultType, | |||
15273 | CanQualType ExpectedFirstParamType, | |||
15274 | unsigned DependentParamTypeDiag, | |||
15275 | unsigned InvalidParamTypeDiag) { | |||
15276 | QualType ResultType = | |||
15277 | FnDecl->getType()->castAs<FunctionType>()->getReturnType(); | |||
15278 | ||||
15279 | // The operator is valid on any address space for OpenCL. | |||
15280 | if (SemaRef.getLangOpts().OpenCLCPlusPlus) { | |||
15281 | if (auto *PtrTy = ResultType->getAs<PointerType>()) { | |||
15282 | ResultType = RemoveAddressSpaceFromPtr(SemaRef, PtrTy); | |||
15283 | } | |||
15284 | } | |||
15285 | ||||
15286 | // Check that the result type is what we expect. | |||
15287 | if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) { | |||
15288 | // Reject even if the type is dependent; an operator delete function is | |||
15289 | // required to have a non-dependent result type. | |||
15290 | return SemaRef.Diag( | |||
15291 | FnDecl->getLocation(), | |||
15292 | ResultType->isDependentType() | |||
15293 | ? diag::err_operator_new_delete_dependent_result_type | |||
15294 | : diag::err_operator_new_delete_invalid_result_type) | |||
15295 | << FnDecl->getDeclName() << ExpectedResultType; | |||
15296 | } | |||
15297 | ||||
15298 | // A function template must have at least 2 parameters. | |||
15299 | if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) | |||
15300 | return SemaRef.Diag(FnDecl->getLocation(), | |||
15301 | diag::err_operator_new_delete_template_too_few_parameters) | |||
15302 | << FnDecl->getDeclName(); | |||
15303 | ||||
15304 | // The function decl must have at least 1 parameter. | |||
15305 | if (FnDecl->getNumParams() == 0) | |||
15306 | return SemaRef.Diag(FnDecl->getLocation(), | |||
15307 | diag::err_operator_new_delete_too_few_parameters) | |||
15308 | << FnDecl->getDeclName(); | |||
15309 | ||||
15310 | QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); | |||
15311 | if (SemaRef.getLangOpts().OpenCLCPlusPlus) { | |||
15312 | // The operator is valid on any address space for OpenCL. | |||
15313 | if (auto *PtrTy = | |||
15314 | FnDecl->getParamDecl(0)->getType()->getAs<PointerType>()) { | |||
15315 | FirstParamType = RemoveAddressSpaceFromPtr(SemaRef, PtrTy); | |||
15316 | } | |||
15317 | } | |||
15318 | ||||
15319 | // Check that the first parameter type is what we expect. | |||
15320 | if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != | |||
15321 | ExpectedFirstParamType) { | |||
15322 | // The first parameter type is not allowed to be dependent. As a tentative | |||
15323 | // DR resolution, we allow a dependent parameter type if it is the right | |||
15324 | // type anyway, to allow destroying operator delete in class templates. | |||
15325 | return SemaRef.Diag(FnDecl->getLocation(), FirstParamType->isDependentType() | |||
15326 | ? DependentParamTypeDiag | |||
15327 | : InvalidParamTypeDiag) | |||
15328 | << FnDecl->getDeclName() << ExpectedFirstParamType; | |||
15329 | } | |||
15330 | ||||
15331 | return false; | |||
15332 | } | |||
15333 | ||||
15334 | static bool | |||
15335 | CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { | |||
15336 | // C++ [basic.stc.dynamic.allocation]p1: | |||
15337 | // A program is ill-formed if an allocation function is declared in a | |||
15338 | // namespace scope other than global scope or declared static in global | |||
15339 | // scope. | |||
15340 | if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) | |||
15341 | return true; | |||
15342 | ||||
15343 | CanQualType SizeTy = | |||
15344 | SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); | |||
15345 | ||||
15346 | // C++ [basic.stc.dynamic.allocation]p1: | |||
15347 | // The return type shall be void*. The first parameter shall have type | |||
15348 | // std::size_t. | |||
15349 | if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, | |||
15350 | SizeTy, | |||
15351 | diag::err_operator_new_dependent_param_type, | |||
15352 | diag::err_operator_new_param_type)) | |||
15353 | return true; | |||
15354 | ||||
15355 | // C++ [basic.stc.dynamic.allocation]p1: | |||
15356 | // The first parameter shall not have an associated default argument. | |||
15357 | if (FnDecl->getParamDecl(0)->hasDefaultArg()) | |||
15358 | return SemaRef.Diag(FnDecl->getLocation(), | |||
15359 | diag::err_operator_new_default_arg) | |||
15360 | << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); | |||
15361 | ||||
15362 | return false; | |||
15363 | } | |||
15364 | ||||
15365 | static bool | |||
15366 | CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { | |||
15367 | // C++ [basic.stc.dynamic.deallocation]p1: | |||
15368 | // A program is ill-formed if deallocation functions are declared in a | |||
15369 | // namespace scope other than global scope or declared static in global | |||
15370 | // scope. | |||
15371 | if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) | |||
15372 | return true; | |||
15373 | ||||
15374 | auto *MD = dyn_cast<CXXMethodDecl>(FnDecl); | |||
15375 | ||||
15376 | // C++ P0722: | |||
15377 | // Within a class C, the first parameter of a destroying operator delete | |||
15378 | // shall be of type C *. The first parameter of any other deallocation | |||
15379 | // function shall be of type void *. | |||
15380 | CanQualType ExpectedFirstParamType = | |||
15381 | MD && MD->isDestroyingOperatorDelete() | |||
15382 | ? SemaRef.Context.getCanonicalType(SemaRef.Context.getPointerType( | |||
15383 | SemaRef.Context.getRecordType(MD->getParent()))) | |||
15384 | : SemaRef.Context.VoidPtrTy; | |||
15385 | ||||
15386 | // C++ [basic.stc.dynamic.deallocation]p2: | |||
15387 | // Each deallocation function shall return void | |||
15388 | if (CheckOperatorNewDeleteTypes( | |||
15389 | SemaRef, FnDecl, SemaRef.Context.VoidTy, ExpectedFirstParamType, | |||
15390 | diag::err_operator_delete_dependent_param_type, | |||
15391 | diag::err_operator_delete_param_type)) | |||
15392 | return true; | |||
15393 | ||||
15394 | // C++ P0722: | |||
15395 | // A destroying operator delete shall be a usual deallocation function. | |||
15396 | if (MD && !MD->getParent()->isDependentContext() && | |||
15397 | MD->isDestroyingOperatorDelete() && | |||
15398 | !SemaRef.isUsualDeallocationFunction(MD)) { | |||
15399 | SemaRef.Diag(MD->getLocation(), | |||
15400 | diag::err_destroying_operator_delete_not_usual); | |||
15401 | return true; | |||
15402 | } | |||
15403 | ||||
15404 | return false; | |||
15405 | } | |||
15406 | ||||
15407 | /// CheckOverloadedOperatorDeclaration - Check whether the declaration | |||
15408 | /// of this overloaded operator is well-formed. If so, returns false; | |||
15409 | /// otherwise, emits appropriate diagnostics and returns true. | |||
15410 | bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { | |||
15411 | assert(FnDecl && FnDecl->isOverloadedOperator() &&((FnDecl && FnDecl->isOverloadedOperator() && "Expected an overloaded operator declaration") ? static_cast <void> (0) : __assert_fail ("FnDecl && FnDecl->isOverloadedOperator() && \"Expected an overloaded operator declaration\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 15412, __PRETTY_FUNCTION__)) | |||
15412 | "Expected an overloaded operator declaration")((FnDecl && FnDecl->isOverloadedOperator() && "Expected an overloaded operator declaration") ? static_cast <void> (0) : __assert_fail ("FnDecl && FnDecl->isOverloadedOperator() && \"Expected an overloaded operator declaration\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 15412, __PRETTY_FUNCTION__)); | |||
15413 | ||||
15414 | OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); | |||
15415 | ||||
15416 | // C++ [over.oper]p5: | |||
15417 | // The allocation and deallocation functions, operator new, | |||
15418 | // operator new[], operator delete and operator delete[], are | |||
15419 | // described completely in 3.7.3. The attributes and restrictions | |||
15420 | // found in the rest of this subclause do not apply to them unless | |||
15421 | // explicitly stated in 3.7.3. | |||
15422 | if (Op == OO_Delete || Op == OO_Array_Delete) | |||
15423 | return CheckOperatorDeleteDeclaration(*this, FnDecl); | |||
15424 | ||||
15425 | if (Op == OO_New || Op == OO_Array_New) | |||
15426 | return CheckOperatorNewDeclaration(*this, FnDecl); | |||
15427 | ||||
15428 | // C++ [over.oper]p6: | |||
15429 | // An operator function shall either be a non-static member | |||
15430 | // function or be a non-member function and have at least one | |||
15431 | // parameter whose type is a class, a reference to a class, an | |||
15432 | // enumeration, or a reference to an enumeration. | |||
15433 | if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { | |||
15434 | if (MethodDecl->isStatic()) | |||
15435 | return Diag(FnDecl->getLocation(), | |||
15436 | diag::err_operator_overload_static) << FnDecl->getDeclName(); | |||
15437 | } else { | |||
15438 | bool ClassOrEnumParam = false; | |||
15439 | for (auto Param : FnDecl->parameters()) { | |||
15440 | QualType ParamType = Param->getType().getNonReferenceType(); | |||
15441 | if (ParamType->isDependentType() || ParamType->isRecordType() || | |||
15442 | ParamType->isEnumeralType()) { | |||
15443 | ClassOrEnumParam = true; | |||
15444 | break; | |||
15445 | } | |||
15446 | } | |||
15447 | ||||
15448 | if (!ClassOrEnumParam) | |||
15449 | return Diag(FnDecl->getLocation(), | |||
15450 | diag::err_operator_overload_needs_class_or_enum) | |||
15451 | << FnDecl->getDeclName(); | |||
15452 | } | |||
15453 | ||||
15454 | // C++ [over.oper]p8: | |||
15455 | // An operator function cannot have default arguments (8.3.6), | |||
15456 | // except where explicitly stated below. | |||
15457 | // | |||
15458 | // Only the function-call operator allows default arguments | |||
15459 | // (C++ [over.call]p1). | |||
15460 | if (Op != OO_Call) { | |||
15461 | for (auto Param : FnDecl->parameters()) { | |||
15462 | if (Param->hasDefaultArg()) | |||
15463 | return Diag(Param->getLocation(), | |||
15464 | diag::err_operator_overload_default_arg) | |||
15465 | << FnDecl->getDeclName() << Param->getDefaultArgRange(); | |||
15466 | } | |||
15467 | } | |||
15468 | ||||
15469 | static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { | |||
15470 | { false, false, false } | |||
15471 | #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ | |||
15472 | , { Unary, Binary, MemberOnly } | |||
15473 | #include "clang/Basic/OperatorKinds.def" | |||
15474 | }; | |||
15475 | ||||
15476 | bool CanBeUnaryOperator = OperatorUses[Op][0]; | |||
15477 | bool CanBeBinaryOperator = OperatorUses[Op][1]; | |||
15478 | bool MustBeMemberOperator = OperatorUses[Op][2]; | |||
15479 | ||||
15480 | // C++ [over.oper]p8: | |||
15481 | // [...] Operator functions cannot have more or fewer parameters | |||
15482 | // than the number required for the corresponding operator, as | |||
15483 | // described in the rest of this subclause. | |||
15484 | unsigned NumParams = FnDecl->getNumParams() | |||
15485 | + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); | |||
15486 | if (Op != OO_Call && | |||
15487 | ((NumParams == 1 && !CanBeUnaryOperator) || | |||
15488 | (NumParams == 2 && !CanBeBinaryOperator) || | |||
15489 | (NumParams < 1) || (NumParams > 2))) { | |||
15490 | // We have the wrong number of parameters. | |||
15491 | unsigned ErrorKind; | |||
15492 | if (CanBeUnaryOperator && CanBeBinaryOperator) { | |||
15493 | ErrorKind = 2; // 2 -> unary or binary. | |||
15494 | } else if (CanBeUnaryOperator) { | |||
15495 | ErrorKind = 0; // 0 -> unary | |||
15496 | } else { | |||
15497 | assert(CanBeBinaryOperator &&((CanBeBinaryOperator && "All non-call overloaded operators are unary or binary!" ) ? static_cast<void> (0) : __assert_fail ("CanBeBinaryOperator && \"All non-call overloaded operators are unary or binary!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 15498, __PRETTY_FUNCTION__)) | |||
15498 | "All non-call overloaded operators are unary or binary!")((CanBeBinaryOperator && "All non-call overloaded operators are unary or binary!" ) ? static_cast<void> (0) : __assert_fail ("CanBeBinaryOperator && \"All non-call overloaded operators are unary or binary!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 15498, __PRETTY_FUNCTION__)); | |||
15499 | ErrorKind = 1; // 1 -> binary | |||
15500 | } | |||
15501 | ||||
15502 | return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) | |||
15503 | << FnDecl->getDeclName() << NumParams << ErrorKind; | |||
15504 | } | |||
15505 | ||||
15506 | // Overloaded operators other than operator() cannot be variadic. | |||
15507 | if (Op != OO_Call && | |||
15508 | FnDecl->getType()->castAs<FunctionProtoType>()->isVariadic()) { | |||
15509 | return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) | |||
15510 | << FnDecl->getDeclName(); | |||
15511 | } | |||
15512 | ||||
15513 | // Some operators must be non-static member functions. | |||
15514 | if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { | |||
15515 | return Diag(FnDecl->getLocation(), | |||
15516 | diag::err_operator_overload_must_be_member) | |||
15517 | << FnDecl->getDeclName(); | |||
15518 | } | |||
15519 | ||||
15520 | // C++ [over.inc]p1: | |||
15521 | // The user-defined function called operator++ implements the | |||
15522 | // prefix and postfix ++ operator. If this function is a member | |||
15523 | // function with no parameters, or a non-member function with one | |||
15524 | // parameter of class or enumeration type, it defines the prefix | |||
15525 | // increment operator ++ for objects of that type. If the function | |||
15526 | // is a member function with one parameter (which shall be of type | |||
15527 | // int) or a non-member function with two parameters (the second | |||
15528 | // of which shall be of type int), it defines the postfix | |||
15529 | // increment operator ++ for objects of that type. | |||
15530 | if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { | |||
15531 | ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); | |||
15532 | QualType ParamType = LastParam->getType(); | |||
15533 | ||||
15534 | if (!ParamType->isSpecificBuiltinType(BuiltinType::Int) && | |||
15535 | !ParamType->isDependentType()) | |||
15536 | return Diag(LastParam->getLocation(), | |||
15537 | diag::err_operator_overload_post_incdec_must_be_int) | |||
15538 | << LastParam->getType() << (Op == OO_MinusMinus); | |||
15539 | } | |||
15540 | ||||
15541 | return false; | |||
15542 | } | |||
15543 | ||||
15544 | static bool | |||
15545 | checkLiteralOperatorTemplateParameterList(Sema &SemaRef, | |||
15546 | FunctionTemplateDecl *TpDecl) { | |||
15547 | TemplateParameterList *TemplateParams = TpDecl->getTemplateParameters(); | |||
15548 | ||||
15549 | // Must have one or two template parameters. | |||
15550 | if (TemplateParams->size() == 1) { | |||
15551 | NonTypeTemplateParmDecl *PmDecl = | |||
15552 | dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(0)); | |||
15553 | ||||
15554 | // The template parameter must be a char parameter pack. | |||
15555 | if (PmDecl && PmDecl->isTemplateParameterPack() && | |||
15556 | SemaRef.Context.hasSameType(PmDecl->getType(), SemaRef.Context.CharTy)) | |||
15557 | return false; | |||
15558 | ||||
15559 | // C++20 [over.literal]p5: | |||
15560 | // A string literal operator template is a literal operator template | |||
15561 | // whose template-parameter-list comprises a single non-type | |||
15562 | // template-parameter of class type. | |||
15563 | // | |||
15564 | // As a DR resolution, we also allow placeholders for deduced class | |||
15565 | // template specializations. | |||
15566 | if (SemaRef.getLangOpts().CPlusPlus20 && | |||
15567 | !PmDecl->isTemplateParameterPack() && | |||
15568 | (PmDecl->getType()->isRecordType() || | |||
15569 | PmDecl->getType()->getAs<DeducedTemplateSpecializationType>())) | |||
15570 | return false; | |||
15571 | } else if (TemplateParams->size() == 2) { | |||
15572 | TemplateTypeParmDecl *PmType = | |||
15573 | dyn_cast<TemplateTypeParmDecl>(TemplateParams->getParam(0)); | |||
15574 | NonTypeTemplateParmDecl *PmArgs = | |||
15575 | dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(1)); | |||
15576 | ||||
15577 | // The second template parameter must be a parameter pack with the | |||
15578 | // first template parameter as its type. | |||
15579 | if (PmType && PmArgs && !PmType->isTemplateParameterPack() && | |||
15580 | PmArgs->isTemplateParameterPack()) { | |||
15581 | const TemplateTypeParmType *TArgs = | |||
15582 | PmArgs->getType()->getAs<TemplateTypeParmType>(); | |||
15583 | if (TArgs && TArgs->getDepth() == PmType->getDepth() && | |||
15584 | TArgs->getIndex() == PmType->getIndex()) { | |||
15585 | if (!SemaRef.inTemplateInstantiation()) | |||
15586 | SemaRef.Diag(TpDecl->getLocation(), | |||
15587 | diag::ext_string_literal_operator_template); | |||
15588 | return false; | |||
15589 | } | |||
15590 | } | |||
15591 | } | |||
15592 | ||||
15593 | SemaRef.Diag(TpDecl->getTemplateParameters()->getSourceRange().getBegin(), | |||
15594 | diag::err_literal_operator_template) | |||
15595 | << TpDecl->getTemplateParameters()->getSourceRange(); | |||
15596 | return true; | |||
15597 | } | |||
15598 | ||||
15599 | /// CheckLiteralOperatorDeclaration - Check whether the declaration | |||
15600 | /// of this literal operator function is well-formed. If so, returns | |||
15601 | /// false; otherwise, emits appropriate diagnostics and returns true. | |||
15602 | bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { | |||
15603 | if (isa<CXXMethodDecl>(FnDecl)) { | |||
15604 | Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) | |||
15605 | << FnDecl->getDeclName(); | |||
15606 | return true; | |||
15607 | } | |||
15608 | ||||
15609 | if (FnDecl->isExternC()) { | |||
15610 | Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); | |||
15611 | if (const LinkageSpecDecl *LSD = | |||
15612 | FnDecl->getDeclContext()->getExternCContext()) | |||
15613 | Diag(LSD->getExternLoc(), diag::note_extern_c_begins_here); | |||
15614 | return true; | |||
15615 | } | |||
15616 | ||||
15617 | // This might be the definition of a literal operator template. | |||
15618 | FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); | |||
15619 | ||||
15620 | // This might be a specialization of a literal operator template. | |||
15621 | if (!TpDecl) | |||
15622 | TpDecl = FnDecl->getPrimaryTemplate(); | |||
15623 | ||||
15624 | // template <char...> type operator "" name() and | |||
15625 | // template <class T, T...> type operator "" name() are the only valid | |||
15626 | // template signatures, and the only valid signatures with no parameters. | |||
15627 | // | |||
15628 | // C++20 also allows template <SomeClass T> type operator "" name(). | |||
15629 | if (TpDecl) { | |||
15630 | if (FnDecl->param_size() != 0) { | |||
15631 | Diag(FnDecl->getLocation(), | |||
15632 | diag::err_literal_operator_template_with_params); | |||
15633 | return true; | |||
15634 | } | |||
15635 | ||||
15636 | if (checkLiteralOperatorTemplateParameterList(*this, TpDecl)) | |||
15637 | return true; | |||
15638 | ||||
15639 | } else if (FnDecl->param_size() == 1) { | |||
15640 | const ParmVarDecl *Param = FnDecl->getParamDecl(0); | |||
15641 | ||||
15642 | QualType ParamType = Param->getType().getUnqualifiedType(); | |||
15643 | ||||
15644 | // Only unsigned long long int, long double, any character type, and const | |||
15645 | // char * are allowed as the only parameters. | |||
15646 | if (ParamType->isSpecificBuiltinType(BuiltinType::ULongLong) || | |||
15647 | ParamType->isSpecificBuiltinType(BuiltinType::LongDouble) || | |||
15648 | Context.hasSameType(ParamType, Context.CharTy) || | |||
15649 | Context.hasSameType(ParamType, Context.WideCharTy) || | |||
15650 | Context.hasSameType(ParamType, Context.Char8Ty) || | |||
15651 | Context.hasSameType(ParamType, Context.Char16Ty) || | |||
15652 | Context.hasSameType(ParamType, Context.Char32Ty)) { | |||
15653 | } else if (const PointerType *Ptr = ParamType->getAs<PointerType>()) { | |||
15654 | QualType InnerType = Ptr->getPointeeType(); | |||
15655 | ||||
15656 | // Pointer parameter must be a const char *. | |||
15657 | if (!(Context.hasSameType(InnerType.getUnqualifiedType(), | |||
15658 | Context.CharTy) && | |||
15659 | InnerType.isConstQualified() && !InnerType.isVolatileQualified())) { | |||
15660 | Diag(Param->getSourceRange().getBegin(), | |||
15661 | diag::err_literal_operator_param) | |||
15662 | << ParamType << "'const char *'" << Param->getSourceRange(); | |||
15663 | return true; | |||
15664 | } | |||
15665 | ||||
15666 | } else if (ParamType->isRealFloatingType()) { | |||
15667 | Diag(Param->getSourceRange().getBegin(), diag::err_literal_operator_param) | |||
15668 | << ParamType << Context.LongDoubleTy << Param->getSourceRange(); | |||
15669 | return true; | |||
15670 | ||||
15671 | } else if (ParamType->isIntegerType()) { | |||
15672 | Diag(Param->getSourceRange().getBegin(), diag::err_literal_operator_param) | |||
15673 | << ParamType << Context.UnsignedLongLongTy << Param->getSourceRange(); | |||
15674 | return true; | |||
15675 | ||||
15676 | } else { | |||
15677 | Diag(Param->getSourceRange().getBegin(), | |||
15678 | diag::err_literal_operator_invalid_param) | |||
15679 | << ParamType << Param->getSourceRange(); | |||
15680 | return true; | |||
15681 | } | |||
15682 | ||||
15683 | } else if (FnDecl->param_size() == 2) { | |||
15684 | FunctionDecl::param_iterator Param = FnDecl->param_begin(); | |||
15685 | ||||
15686 | // First, verify that the first parameter is correct. | |||
15687 | ||||
15688 | QualType FirstParamType = (*Param)->getType().getUnqualifiedType(); | |||
15689 | ||||
15690 | // Two parameter function must have a pointer to const as a | |||
15691 | // first parameter; let's strip those qualifiers. | |||
15692 | const PointerType *PT = FirstParamType->getAs<PointerType>(); | |||
15693 | ||||
15694 | if (!PT) { | |||
15695 | Diag((*Param)->getSourceRange().getBegin(), | |||
15696 | diag::err_literal_operator_param) | |||
15697 | << FirstParamType << "'const char *'" << (*Param)->getSourceRange(); | |||
15698 | return true; | |||
15699 | } | |||
15700 | ||||
15701 | QualType PointeeType = PT->getPointeeType(); | |||
15702 | // First parameter must be const | |||
15703 | if (!PointeeType.isConstQualified() || PointeeType.isVolatileQualified()) { | |||
15704 | Diag((*Param)->getSourceRange().getBegin(), | |||
15705 | diag::err_literal_operator_param) | |||
15706 | << FirstParamType << "'const char *'" << (*Param)->getSourceRange(); | |||
15707 | return true; | |||
15708 | } | |||
15709 | ||||
15710 | QualType InnerType = PointeeType.getUnqualifiedType(); | |||
15711 | // Only const char *, const wchar_t*, const char8_t*, const char16_t*, and | |||
15712 | // const char32_t* are allowed as the first parameter to a two-parameter | |||
15713 | // function | |||
15714 | if (!(Context.hasSameType(InnerType, Context.CharTy) || | |||
15715 | Context.hasSameType(InnerType, Context.WideCharTy) || | |||
15716 | Context.hasSameType(InnerType, Context.Char8Ty) || | |||
15717 | Context.hasSameType(InnerType, Context.Char16Ty) || | |||
15718 | Context.hasSameType(InnerType, Context.Char32Ty))) { | |||
15719 | Diag((*Param)->getSourceRange().getBegin(), | |||
15720 | diag::err_literal_operator_param) | |||
15721 | << FirstParamType << "'const char *'" << (*Param)->getSourceRange(); | |||
15722 | return true; | |||
15723 | } | |||
15724 | ||||
15725 | // Move on to the second and final parameter. | |||
15726 | ++Param; | |||
15727 | ||||
15728 | // The second parameter must be a std::size_t. | |||
15729 | QualType SecondParamType = (*Param)->getType().getUnqualifiedType(); | |||
15730 | if (!Context.hasSameType(SecondParamType, Context.getSizeType())) { | |||
15731 | Diag((*Param)->getSourceRange().getBegin(), | |||
15732 | diag::err_literal_operator_param) | |||
15733 | << SecondParamType << Context.getSizeType() | |||
15734 | << (*Param)->getSourceRange(); | |||
15735 | return true; | |||
15736 | } | |||
15737 | } else { | |||
15738 | Diag(FnDecl->getLocation(), diag::err_literal_operator_bad_param_count); | |||
15739 | return true; | |||
15740 | } | |||
15741 | ||||
15742 | // Parameters are good. | |||
15743 | ||||
15744 | // A parameter-declaration-clause containing a default argument is not | |||
15745 | // equivalent to any of the permitted forms. | |||
15746 | for (auto Param : FnDecl->parameters()) { | |||
15747 | if (Param->hasDefaultArg()) { | |||
15748 | Diag(Param->getDefaultArgRange().getBegin(), | |||
15749 | diag::err_literal_operator_default_argument) | |||
15750 | << Param->getDefaultArgRange(); | |||
15751 | break; | |||
15752 | } | |||
15753 | } | |||
15754 | ||||
15755 | StringRef LiteralName | |||
15756 | = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); | |||
15757 | if (LiteralName[0] != '_' && | |||
15758 | !getSourceManager().isInSystemHeader(FnDecl->getLocation())) { | |||
15759 | // C++11 [usrlit.suffix]p1: | |||
15760 | // Literal suffix identifiers that do not start with an underscore | |||
15761 | // are reserved for future standardization. | |||
15762 | Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved) | |||
15763 | << StringLiteralParser::isValidUDSuffix(getLangOpts(), LiteralName); | |||
15764 | } | |||
15765 | ||||
15766 | return false; | |||
15767 | } | |||
15768 | ||||
15769 | /// ActOnStartLinkageSpecification - Parsed the beginning of a C++ | |||
15770 | /// linkage specification, including the language and (if present) | |||
15771 | /// the '{'. ExternLoc is the location of the 'extern', Lang is the | |||
15772 | /// language string literal. LBraceLoc, if valid, provides the location of | |||
15773 | /// the '{' brace. Otherwise, this linkage specification does not | |||
15774 | /// have any braces. | |||
15775 | Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, | |||
15776 | Expr *LangStr, | |||
15777 | SourceLocation LBraceLoc) { | |||
15778 | StringLiteral *Lit = cast<StringLiteral>(LangStr); | |||
15779 | if (!Lit->isAscii()) { | |||
15780 | Diag(LangStr->getExprLoc(), diag::err_language_linkage_spec_not_ascii) | |||
15781 | << LangStr->getSourceRange(); | |||
15782 | return nullptr; | |||
15783 | } | |||
15784 | ||||
15785 | StringRef Lang = Lit->getString(); | |||
15786 | LinkageSpecDecl::LanguageIDs Language; | |||
15787 | if (Lang == "C") | |||
15788 | Language = LinkageSpecDecl::lang_c; | |||
15789 | else if (Lang == "C++") | |||
15790 | Language = LinkageSpecDecl::lang_cxx; | |||
15791 | else { | |||
15792 | Diag(LangStr->getExprLoc(), diag::err_language_linkage_spec_unknown) | |||
15793 | << LangStr->getSourceRange(); | |||
15794 | return nullptr; | |||
15795 | } | |||
15796 | ||||
15797 | // FIXME: Add all the various semantics of linkage specifications | |||
15798 | ||||
15799 | LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, ExternLoc, | |||
15800 | LangStr->getExprLoc(), Language, | |||
15801 | LBraceLoc.isValid()); | |||
15802 | CurContext->addDecl(D); | |||
15803 | PushDeclContext(S, D); | |||
15804 | return D; | |||
15805 | } | |||
15806 | ||||
15807 | /// ActOnFinishLinkageSpecification - Complete the definition of | |||
15808 | /// the C++ linkage specification LinkageSpec. If RBraceLoc is | |||
15809 | /// valid, it's the position of the closing '}' brace in a linkage | |||
15810 | /// specification that uses braces. | |||
15811 | Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, | |||
15812 | Decl *LinkageSpec, | |||
15813 | SourceLocation RBraceLoc) { | |||
15814 | if (RBraceLoc.isValid()) { | |||
15815 | LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); | |||
15816 | LSDecl->setRBraceLoc(RBraceLoc); | |||
15817 | } | |||
15818 | PopDeclContext(); | |||
15819 | return LinkageSpec; | |||
15820 | } | |||
15821 | ||||
15822 | Decl *Sema::ActOnEmptyDeclaration(Scope *S, | |||
15823 | const ParsedAttributesView &AttrList, | |||
15824 | SourceLocation SemiLoc) { | |||
15825 | Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc); | |||
15826 | // Attribute declarations appertain to empty declaration so we handle | |||
15827 | // them here. | |||
15828 | ProcessDeclAttributeList(S, ED, AttrList); | |||
15829 | ||||
15830 | CurContext->addDecl(ED); | |||
15831 | return ED; | |||
15832 | } | |||
15833 | ||||
15834 | /// Perform semantic analysis for the variable declaration that | |||
15835 | /// occurs within a C++ catch clause, returning the newly-created | |||
15836 | /// variable. | |||
15837 | VarDecl *Sema::BuildExceptionDeclaration(Scope *S, | |||
15838 | TypeSourceInfo *TInfo, | |||
15839 | SourceLocation StartLoc, | |||
15840 | SourceLocation Loc, | |||
15841 | IdentifierInfo *Name) { | |||
15842 | bool Invalid = false; | |||
15843 | QualType ExDeclType = TInfo->getType(); | |||
15844 | ||||
15845 | // Arrays and functions decay. | |||
15846 | if (ExDeclType->isArrayType()) | |||
15847 | ExDeclType = Context.getArrayDecayedType(ExDeclType); | |||
15848 | else if (ExDeclType->isFunctionType()) | |||
15849 | ExDeclType = Context.getPointerType(ExDeclType); | |||
15850 | ||||
15851 | // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. | |||
15852 | // The exception-declaration shall not denote a pointer or reference to an | |||
15853 | // incomplete type, other than [cv] void*. | |||
15854 | // N2844 forbids rvalue references. | |||
15855 | if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { | |||
15856 | Diag(Loc, diag::err_catch_rvalue_ref); | |||
15857 | Invalid = true; | |||
15858 | } | |||
15859 | ||||
15860 | if (ExDeclType->isVariablyModifiedType()) { | |||
15861 | Diag(Loc, diag::err_catch_variably_modified) << ExDeclType; | |||
15862 | Invalid = true; | |||
15863 | } | |||
15864 | ||||
15865 | QualType BaseType = ExDeclType; | |||
15866 | int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference | |||
15867 | unsigned DK = diag::err_catch_incomplete; | |||
15868 | if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { | |||
15869 | BaseType = Ptr->getPointeeType(); | |||
15870 | Mode = 1; | |||
15871 | DK = diag::err_catch_incomplete_ptr; | |||
15872 | } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { | |||
15873 | // For the purpose of error recovery, we treat rvalue refs like lvalue refs. | |||
15874 | BaseType = Ref->getPointeeType(); | |||
15875 | Mode = 2; | |||
15876 | DK = diag::err_catch_incomplete_ref; | |||
15877 | } | |||
15878 | if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && | |||
15879 | !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) | |||
15880 | Invalid = true; | |||
15881 | ||||
15882 | if (!Invalid && Mode != 1 && BaseType->isSizelessType()) { | |||
15883 | Diag(Loc, diag::err_catch_sizeless) << (Mode == 2 ? 1 : 0) << BaseType; | |||
15884 | Invalid = true; | |||
15885 | } | |||
15886 | ||||
15887 | if (!Invalid && !ExDeclType->isDependentType() && | |||
15888 | RequireNonAbstractType(Loc, ExDeclType, | |||
15889 | diag::err_abstract_type_in_decl, | |||
15890 | AbstractVariableType)) | |||
15891 | Invalid = true; | |||
15892 | ||||
15893 | // Only the non-fragile NeXT runtime currently supports C++ catches | |||
15894 | // of ObjC types, and no runtime supports catching ObjC types by value. | |||
15895 | if (!Invalid && getLangOpts().ObjC) { | |||
15896 | QualType T = ExDeclType; | |||
15897 | if (const ReferenceType *RT = T->getAs<ReferenceType>()) | |||
15898 | T = RT->getPointeeType(); | |||
15899 | ||||
15900 | if (T->isObjCObjectType()) { | |||
15901 | Diag(Loc, diag::err_objc_object_catch); | |||
15902 | Invalid = true; | |||
15903 | } else if (T->isObjCObjectPointerType()) { | |||
15904 | // FIXME: should this be a test for macosx-fragile specifically? | |||
15905 | if (getLangOpts().ObjCRuntime.isFragile()) | |||
15906 | Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); | |||
15907 | } | |||
15908 | } | |||
15909 | ||||
15910 | VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, | |||
15911 | ExDeclType, TInfo, SC_None); | |||
15912 | ExDecl->setExceptionVariable(true); | |||
15913 | ||||
15914 | // In ARC, infer 'retaining' for variables of retainable type. | |||
15915 | if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) | |||
15916 | Invalid = true; | |||
15917 | ||||
15918 | if (!Invalid && !ExDeclType->isDependentType()) { | |||
15919 | if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { | |||
15920 | // Insulate this from anything else we might currently be parsing. | |||
15921 | EnterExpressionEvaluationContext scope( | |||
15922 | *this, ExpressionEvaluationContext::PotentiallyEvaluated); | |||
15923 | ||||
15924 | // C++ [except.handle]p16: | |||
15925 | // The object declared in an exception-declaration or, if the | |||
15926 | // exception-declaration does not specify a name, a temporary (12.2) is | |||
15927 | // copy-initialized (8.5) from the exception object. [...] | |||
15928 | // The object is destroyed when the handler exits, after the destruction | |||
15929 | // of any automatic objects initialized within the handler. | |||
15930 | // | |||
15931 | // We just pretend to initialize the object with itself, then make sure | |||
15932 | // it can be destroyed later. | |||
15933 | QualType initType = Context.getExceptionObjectType(ExDeclType); | |||
15934 | ||||
15935 | InitializedEntity entity = | |||
15936 | InitializedEntity::InitializeVariable(ExDecl); | |||
15937 | InitializationKind initKind = | |||
15938 | InitializationKind::CreateCopy(Loc, SourceLocation()); | |||
15939 | ||||
15940 | Expr *opaqueValue = | |||
15941 | new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); | |||
15942 | InitializationSequence sequence(*this, entity, initKind, opaqueValue); | |||
15943 | ExprResult result = sequence.Perform(*this, entity, initKind, opaqueValue); | |||
15944 | if (result.isInvalid()) | |||
15945 | Invalid = true; | |||
15946 | else { | |||
15947 | // If the constructor used was non-trivial, set this as the | |||
15948 | // "initializer". | |||
15949 | CXXConstructExpr *construct = result.getAs<CXXConstructExpr>(); | |||
15950 | if (!construct->getConstructor()->isTrivial()) { | |||
15951 | Expr *init = MaybeCreateExprWithCleanups(construct); | |||
15952 | ExDecl->setInit(init); | |||
15953 | } | |||
15954 | ||||
15955 | // And make sure it's destructable. | |||
15956 | FinalizeVarWithDestructor(ExDecl, recordType); | |||
15957 | } | |||
15958 | } | |||
15959 | } | |||
15960 | ||||
15961 | if (Invalid) | |||
15962 | ExDecl->setInvalidDecl(); | |||
15963 | ||||
15964 | return ExDecl; | |||
15965 | } | |||
15966 | ||||
15967 | /// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch | |||
15968 | /// handler. | |||
15969 | Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { | |||
15970 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); | |||
15971 | bool Invalid = D.isInvalidType(); | |||
15972 | ||||
15973 | // Check for unexpanded parameter packs. | |||
15974 | if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, | |||
15975 | UPPC_ExceptionType)) { | |||
15976 | TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, | |||
15977 | D.getIdentifierLoc()); | |||
15978 | Invalid = true; | |||
15979 | } | |||
15980 | ||||
15981 | IdentifierInfo *II = D.getIdentifier(); | |||
15982 | if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), | |||
15983 | LookupOrdinaryName, | |||
15984 | ForVisibleRedeclaration)) { | |||
15985 | // The scope should be freshly made just for us. There is just no way | |||
15986 | // it contains any previous declaration, except for function parameters in | |||
15987 | // a function-try-block's catch statement. | |||
15988 | assert(!S->isDeclScope(PrevDecl))((!S->isDeclScope(PrevDecl)) ? static_cast<void> (0) : __assert_fail ("!S->isDeclScope(PrevDecl)", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 15988, __PRETTY_FUNCTION__)); | |||
15989 | if (isDeclInScope(PrevDecl, CurContext, S)) { | |||
15990 | Diag(D.getIdentifierLoc(), diag::err_redefinition) | |||
15991 | << D.getIdentifier(); | |||
15992 | Diag(PrevDecl->getLocation(), diag::note_previous_definition); | |||
15993 | Invalid = true; | |||
15994 | } else if (PrevDecl->isTemplateParameter()) | |||
15995 | // Maybe we will complain about the shadowed template parameter. | |||
15996 | DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); | |||
15997 | } | |||
15998 | ||||
15999 | if (D.getCXXScopeSpec().isSet() && !Invalid) { | |||
16000 | Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) | |||
16001 | << D.getCXXScopeSpec().getRange(); | |||
16002 | Invalid = true; | |||
16003 | } | |||
16004 | ||||
16005 | VarDecl *ExDecl = BuildExceptionDeclaration( | |||
16006 | S, TInfo, D.getBeginLoc(), D.getIdentifierLoc(), D.getIdentifier()); | |||
16007 | if (Invalid) | |||
16008 | ExDecl->setInvalidDecl(); | |||
16009 | ||||
16010 | // Add the exception declaration into this scope. | |||
16011 | if (II) | |||
16012 | PushOnScopeChains(ExDecl, S); | |||
16013 | else | |||
16014 | CurContext->addDecl(ExDecl); | |||
16015 | ||||
16016 | ProcessDeclAttributes(S, ExDecl, D); | |||
16017 | return ExDecl; | |||
16018 | } | |||
16019 | ||||
16020 | Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, | |||
16021 | Expr *AssertExpr, | |||
16022 | Expr *AssertMessageExpr, | |||
16023 | SourceLocation RParenLoc) { | |||
16024 | StringLiteral *AssertMessage = | |||
16025 | AssertMessageExpr ? cast<StringLiteral>(AssertMessageExpr) : nullptr; | |||
16026 | ||||
16027 | if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) | |||
16028 | return nullptr; | |||
16029 | ||||
16030 | return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, | |||
16031 | AssertMessage, RParenLoc, false); | |||
16032 | } | |||
16033 | ||||
16034 | Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, | |||
16035 | Expr *AssertExpr, | |||
16036 | StringLiteral *AssertMessage, | |||
16037 | SourceLocation RParenLoc, | |||
16038 | bool Failed) { | |||
16039 | assert(AssertExpr != nullptr && "Expected non-null condition")((AssertExpr != nullptr && "Expected non-null condition" ) ? static_cast<void> (0) : __assert_fail ("AssertExpr != nullptr && \"Expected non-null condition\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 16039, __PRETTY_FUNCTION__)); | |||
16040 | if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && | |||
16041 | !Failed) { | |||
16042 | // In a static_assert-declaration, the constant-expression shall be a | |||
16043 | // constant expression that can be contextually converted to bool. | |||
16044 | ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); | |||
16045 | if (Converted.isInvalid()) | |||
16046 | Failed = true; | |||
16047 | ||||
16048 | ExprResult FullAssertExpr = | |||
16049 | ActOnFinishFullExpr(Converted.get(), StaticAssertLoc, | |||
16050 | /*DiscardedValue*/ false, | |||
16051 | /*IsConstexpr*/ true); | |||
16052 | if (FullAssertExpr.isInvalid()) | |||
16053 | Failed = true; | |||
16054 | else | |||
16055 | AssertExpr = FullAssertExpr.get(); | |||
16056 | ||||
16057 | llvm::APSInt Cond; | |||
16058 | if (!Failed && VerifyIntegerConstantExpression( | |||
16059 | AssertExpr, &Cond, | |||
16060 | diag::err_static_assert_expression_is_not_constant) | |||
16061 | .isInvalid()) | |||
16062 | Failed = true; | |||
16063 | ||||
16064 | if (!Failed && !Cond) { | |||
16065 | SmallString<256> MsgBuffer; | |||
16066 | llvm::raw_svector_ostream Msg(MsgBuffer); | |||
16067 | if (AssertMessage) | |||
16068 | AssertMessage->printPretty(Msg, nullptr, getPrintingPolicy()); | |||
16069 | ||||
16070 | Expr *InnerCond = nullptr; | |||
16071 | std::string InnerCondDescription; | |||
16072 | std::tie(InnerCond, InnerCondDescription) = | |||
16073 | findFailedBooleanCondition(Converted.get()); | |||
16074 | if (InnerCond && isa<ConceptSpecializationExpr>(InnerCond)) { | |||
16075 | // Drill down into concept specialization expressions to see why they | |||
16076 | // weren't satisfied. | |||
16077 | Diag(StaticAssertLoc, diag::err_static_assert_failed) | |||
16078 | << !AssertMessage << Msg.str() << AssertExpr->getSourceRange(); | |||
16079 | ConstraintSatisfaction Satisfaction; | |||
16080 | if (!CheckConstraintSatisfaction(InnerCond, Satisfaction)) | |||
16081 | DiagnoseUnsatisfiedConstraint(Satisfaction); | |||
16082 | } else if (InnerCond && !isa<CXXBoolLiteralExpr>(InnerCond) | |||
16083 | && !isa<IntegerLiteral>(InnerCond)) { | |||
16084 | Diag(StaticAssertLoc, diag::err_static_assert_requirement_failed) | |||
16085 | << InnerCondDescription << !AssertMessage | |||
16086 | << Msg.str() << InnerCond->getSourceRange(); | |||
16087 | } else { | |||
16088 | Diag(StaticAssertLoc, diag::err_static_assert_failed) | |||
16089 | << !AssertMessage << Msg.str() << AssertExpr->getSourceRange(); | |||
16090 | } | |||
16091 | Failed = true; | |||
16092 | } | |||
16093 | } else { | |||
16094 | ExprResult FullAssertExpr = ActOnFinishFullExpr(AssertExpr, StaticAssertLoc, | |||
16095 | /*DiscardedValue*/false, | |||
16096 | /*IsConstexpr*/true); | |||
16097 | if (FullAssertExpr.isInvalid()) | |||
16098 | Failed = true; | |||
16099 | else | |||
16100 | AssertExpr = FullAssertExpr.get(); | |||
16101 | } | |||
16102 | ||||
16103 | Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, | |||
16104 | AssertExpr, AssertMessage, RParenLoc, | |||
16105 | Failed); | |||
16106 | ||||
16107 | CurContext->addDecl(Decl); | |||
16108 | return Decl; | |||
16109 | } | |||
16110 | ||||
16111 | /// Perform semantic analysis of the given friend type declaration. | |||
16112 | /// | |||
16113 | /// \returns A friend declaration that. | |||
16114 | FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, | |||
16115 | SourceLocation FriendLoc, | |||
16116 | TypeSourceInfo *TSInfo) { | |||
16117 | assert(TSInfo && "NULL TypeSourceInfo for friend type declaration")((TSInfo && "NULL TypeSourceInfo for friend type declaration" ) ? static_cast<void> (0) : __assert_fail ("TSInfo && \"NULL TypeSourceInfo for friend type declaration\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 16117, __PRETTY_FUNCTION__)); | |||
16118 | ||||
16119 | QualType T = TSInfo->getType(); | |||
16120 | SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); | |||
16121 | ||||
16122 | // C++03 [class.friend]p2: | |||
16123 | // An elaborated-type-specifier shall be used in a friend declaration | |||
16124 | // for a class.* | |||
16125 | // | |||
16126 | // * The class-key of the elaborated-type-specifier is required. | |||
16127 | if (!CodeSynthesisContexts.empty()) { | |||
16128 | // Do not complain about the form of friend template types during any kind | |||
16129 | // of code synthesis. For template instantiation, we will have complained | |||
16130 | // when the template was defined. | |||
16131 | } else { | |||
16132 | if (!T->isElaboratedTypeSpecifier()) { | |||
16133 | // If we evaluated the type to a record type, suggest putting | |||
16134 | // a tag in front. | |||
16135 | if (const RecordType *RT = T->getAs<RecordType>()) { | |||
16136 | RecordDecl *RD = RT->getDecl(); | |||
16137 | ||||
16138 | SmallString<16> InsertionText(" "); | |||
16139 | InsertionText += RD->getKindName(); | |||
16140 | ||||
16141 | Diag(TypeRange.getBegin(), | |||
16142 | getLangOpts().CPlusPlus11 ? | |||
16143 | diag::warn_cxx98_compat_unelaborated_friend_type : | |||
16144 | diag::ext_unelaborated_friend_type) | |||
16145 | << (unsigned) RD->getTagKind() | |||
16146 | << T | |||
16147 | << FixItHint::CreateInsertion(getLocForEndOfToken(FriendLoc), | |||
16148 | InsertionText); | |||
16149 | } else { | |||
16150 | Diag(FriendLoc, | |||
16151 | getLangOpts().CPlusPlus11 ? | |||
16152 | diag::warn_cxx98_compat_nonclass_type_friend : | |||
16153 | diag::ext_nonclass_type_friend) | |||
16154 | << T | |||
16155 | << TypeRange; | |||
16156 | } | |||
16157 | } else if (T->getAs<EnumType>()) { | |||
16158 | Diag(FriendLoc, | |||
16159 | getLangOpts().CPlusPlus11 ? | |||
16160 | diag::warn_cxx98_compat_enum_friend : | |||
16161 | diag::ext_enum_friend) | |||
16162 | << T | |||
16163 | << TypeRange; | |||
16164 | } | |||
16165 | ||||
16166 | // C++11 [class.friend]p3: | |||
16167 | // A friend declaration that does not declare a function shall have one | |||
16168 | // of the following forms: | |||
16169 | // friend elaborated-type-specifier ; | |||
16170 | // friend simple-type-specifier ; | |||
16171 | // friend typename-specifier ; | |||
16172 | if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc) | |||
16173 | Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; | |||
16174 | } | |||
16175 | ||||
16176 | // If the type specifier in a friend declaration designates a (possibly | |||
16177 | // cv-qualified) class type, that class is declared as a friend; otherwise, | |||
16178 | // the friend declaration is ignored. | |||
16179 | return FriendDecl::Create(Context, CurContext, | |||
16180 | TSInfo->getTypeLoc().getBeginLoc(), TSInfo, | |||
16181 | FriendLoc); | |||
16182 | } | |||
16183 | ||||
16184 | /// Handle a friend tag declaration where the scope specifier was | |||
16185 | /// templated. | |||
16186 | Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, | |||
16187 | unsigned TagSpec, SourceLocation TagLoc, | |||
16188 | CXXScopeSpec &SS, IdentifierInfo *Name, | |||
16189 | SourceLocation NameLoc, | |||
16190 | const ParsedAttributesView &Attr, | |||
16191 | MultiTemplateParamsArg TempParamLists) { | |||
16192 | TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); | |||
16193 | ||||
16194 | bool IsMemberSpecialization = false; | |||
16195 | bool Invalid = false; | |||
16196 | ||||
16197 | if (TemplateParameterList *TemplateParams = | |||
16198 | MatchTemplateParametersToScopeSpecifier( | |||
16199 | TagLoc, NameLoc, SS, nullptr, TempParamLists, /*friend*/ true, | |||
16200 | IsMemberSpecialization, Invalid)) { | |||
16201 | if (TemplateParams->size() > 0) { | |||
16202 | // This is a declaration of a class template. | |||
16203 | if (Invalid) | |||
16204 | return nullptr; | |||
16205 | ||||
16206 | return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, SS, Name, | |||
16207 | NameLoc, Attr, TemplateParams, AS_public, | |||
16208 | /*ModulePrivateLoc=*/SourceLocation(), | |||
16209 | FriendLoc, TempParamLists.size() - 1, | |||
16210 | TempParamLists.data()).get(); | |||
16211 | } else { | |||
16212 | // The "template<>" header is extraneous. | |||
16213 | Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) | |||
16214 | << TypeWithKeyword::getTagTypeKindName(Kind) << Name; | |||
16215 | IsMemberSpecialization = true; | |||
16216 | } | |||
16217 | } | |||
16218 | ||||
16219 | if (Invalid) return nullptr; | |||
16220 | ||||
16221 | bool isAllExplicitSpecializations = true; | |||
16222 | for (unsigned I = TempParamLists.size(); I-- > 0; ) { | |||
16223 | if (TempParamLists[I]->size()) { | |||
16224 | isAllExplicitSpecializations = false; | |||
16225 | break; | |||
16226 | } | |||
16227 | } | |||
16228 | ||||
16229 | // FIXME: don't ignore attributes. | |||
16230 | ||||
16231 | // If it's explicit specializations all the way down, just forget | |||
16232 | // about the template header and build an appropriate non-templated | |||
16233 | // friend. TODO: for source fidelity, remember the headers. | |||
16234 | if (isAllExplicitSpecializations) { | |||
16235 | if (SS.isEmpty()) { | |||
16236 | bool Owned = false; | |||
16237 | bool IsDependent = false; | |||
16238 | return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, | |||
16239 | Attr, AS_public, | |||
16240 | /*ModulePrivateLoc=*/SourceLocation(), | |||
16241 | MultiTemplateParamsArg(), Owned, IsDependent, | |||
16242 | /*ScopedEnumKWLoc=*/SourceLocation(), | |||
16243 | /*ScopedEnumUsesClassTag=*/false, | |||
16244 | /*UnderlyingType=*/TypeResult(), | |||
16245 | /*IsTypeSpecifier=*/false, | |||
16246 | /*IsTemplateParamOrArg=*/false); | |||
16247 | } | |||
16248 | ||||
16249 | NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); | |||
16250 | ElaboratedTypeKeyword Keyword | |||
16251 | = TypeWithKeyword::getKeywordForTagTypeKind(Kind); | |||
16252 | QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, | |||
16253 | *Name, NameLoc); | |||
16254 | if (T.isNull()) | |||
16255 | return nullptr; | |||
16256 | ||||
16257 | TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); | |||
16258 | if (isa<DependentNameType>(T)) { | |||
16259 | DependentNameTypeLoc TL = | |||
16260 | TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); | |||
16261 | TL.setElaboratedKeywordLoc(TagLoc); | |||
16262 | TL.setQualifierLoc(QualifierLoc); | |||
16263 | TL.setNameLoc(NameLoc); | |||
16264 | } else { | |||
16265 | ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>(); | |||
16266 | TL.setElaboratedKeywordLoc(TagLoc); | |||
16267 | TL.setQualifierLoc(QualifierLoc); | |||
16268 | TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc); | |||
16269 | } | |||
16270 | ||||
16271 | FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, | |||
16272 | TSI, FriendLoc, TempParamLists); | |||
16273 | Friend->setAccess(AS_public); | |||
16274 | CurContext->addDecl(Friend); | |||
16275 | return Friend; | |||
16276 | } | |||
16277 | ||||
16278 | assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?")((SS.isNotEmpty() && "valid templated tag with no SS and no direct?" ) ? static_cast<void> (0) : __assert_fail ("SS.isNotEmpty() && \"valid templated tag with no SS and no direct?\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 16278, __PRETTY_FUNCTION__)); | |||
16279 | ||||
16280 | ||||
16281 | ||||
16282 | // Handle the case of a templated-scope friend class. e.g. | |||
16283 | // template <class T> class A<T>::B; | |||
16284 | // FIXME: we don't support these right now. | |||
16285 | Diag(NameLoc, diag::warn_template_qualified_friend_unsupported) | |||
16286 | << SS.getScopeRep() << SS.getRange() << cast<CXXRecordDecl>(CurContext); | |||
16287 | ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); | |||
16288 | QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); | |||
16289 | TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); | |||
16290 | DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); | |||
16291 | TL.setElaboratedKeywordLoc(TagLoc); | |||
16292 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); | |||
16293 | TL.setNameLoc(NameLoc); | |||
16294 | ||||
16295 | FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, | |||
16296 | TSI, FriendLoc, TempParamLists); | |||
16297 | Friend->setAccess(AS_public); | |||
16298 | Friend->setUnsupportedFriend(true); | |||
16299 | CurContext->addDecl(Friend); | |||
16300 | return Friend; | |||
16301 | } | |||
16302 | ||||
16303 | /// Handle a friend type declaration. This works in tandem with | |||
16304 | /// ActOnTag. | |||
16305 | /// | |||
16306 | /// Notes on friend class templates: | |||
16307 | /// | |||
16308 | /// We generally treat friend class declarations as if they were | |||
16309 | /// declaring a class. So, for example, the elaborated type specifier | |||
16310 | /// in a friend declaration is required to obey the restrictions of a | |||
16311 | /// class-head (i.e. no typedefs in the scope chain), template | |||
16312 | /// parameters are required to match up with simple template-ids, &c. | |||
16313 | /// However, unlike when declaring a template specialization, it's | |||
16314 | /// okay to refer to a template specialization without an empty | |||
16315 | /// template parameter declaration, e.g. | |||
16316 | /// friend class A<T>::B<unsigned>; | |||
16317 | /// We permit this as a special case; if there are any template | |||
16318 | /// parameters present at all, require proper matching, i.e. | |||
16319 | /// template <> template \<class T> friend class A<int>::B; | |||
16320 | Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, | |||
16321 | MultiTemplateParamsArg TempParams) { | |||
16322 | SourceLocation Loc = DS.getBeginLoc(); | |||
16323 | ||||
16324 | assert(DS.isFriendSpecified())((DS.isFriendSpecified()) ? static_cast<void> (0) : __assert_fail ("DS.isFriendSpecified()", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 16324, __PRETTY_FUNCTION__)); | |||
16325 | assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified)((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) ? static_cast <void> (0) : __assert_fail ("DS.getStorageClassSpec() == DeclSpec::SCS_unspecified" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 16325, __PRETTY_FUNCTION__)); | |||
16326 | ||||
16327 | // C++ [class.friend]p3: | |||
16328 | // A friend declaration that does not declare a function shall have one of | |||
16329 | // the following forms: | |||
16330 | // friend elaborated-type-specifier ; | |||
16331 | // friend simple-type-specifier ; | |||
16332 | // friend typename-specifier ; | |||
16333 | // | |||
16334 | // Any declaration with a type qualifier does not have that form. (It's | |||
16335 | // legal to specify a qualified type as a friend, you just can't write the | |||
16336 | // keywords.) | |||
16337 | if (DS.getTypeQualifiers()) { | |||
16338 | if (DS.getTypeQualifiers() & DeclSpec::TQ_const) | |||
16339 | Diag(DS.getConstSpecLoc(), diag::err_friend_decl_spec) << "const"; | |||
16340 | if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) | |||
16341 | Diag(DS.getVolatileSpecLoc(), diag::err_friend_decl_spec) << "volatile"; | |||
16342 | if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) | |||
16343 | Diag(DS.getRestrictSpecLoc(), diag::err_friend_decl_spec) << "restrict"; | |||
16344 | if (DS.getTypeQualifiers() & DeclSpec::TQ_atomic) | |||
16345 | Diag(DS.getAtomicSpecLoc(), diag::err_friend_decl_spec) << "_Atomic"; | |||
16346 | if (DS.getTypeQualifiers() & DeclSpec::TQ_unaligned) | |||
16347 | Diag(DS.getUnalignedSpecLoc(), diag::err_friend_decl_spec) << "__unaligned"; | |||
16348 | } | |||
16349 | ||||
16350 | // Try to convert the decl specifier to a type. This works for | |||
16351 | // friend templates because ActOnTag never produces a ClassTemplateDecl | |||
16352 | // for a TUK_Friend. | |||
16353 | Declarator TheDeclarator(DS, DeclaratorContext::Member); | |||
16354 | TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); | |||
16355 | QualType T = TSI->getType(); | |||
16356 | if (TheDeclarator.isInvalidType()) | |||
16357 | return nullptr; | |||
16358 | ||||
16359 | if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) | |||
16360 | return nullptr; | |||
16361 | ||||
16362 | // This is definitely an error in C++98. It's probably meant to | |||
16363 | // be forbidden in C++0x, too, but the specification is just | |||
16364 | // poorly written. | |||
16365 | // | |||
16366 | // The problem is with declarations like the following: | |||
16367 | // template <T> friend A<T>::foo; | |||
16368 | // where deciding whether a class C is a friend or not now hinges | |||
16369 | // on whether there exists an instantiation of A that causes | |||
16370 | // 'foo' to equal C. There are restrictions on class-heads | |||
16371 | // (which we declare (by fiat) elaborated friend declarations to | |||
16372 | // be) that makes this tractable. | |||
16373 | // | |||
16374 | // FIXME: handle "template <> friend class A<T>;", which | |||
16375 | // is possibly well-formed? Who even knows? | |||
16376 | if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { | |||
16377 | Diag(Loc, diag::err_tagless_friend_type_template) | |||
16378 | << DS.getSourceRange(); | |||
16379 | return nullptr; | |||
16380 | } | |||
16381 | ||||
16382 | // C++98 [class.friend]p1: A friend of a class is a function | |||
16383 | // or class that is not a member of the class . . . | |||
16384 | // This is fixed in DR77, which just barely didn't make the C++03 | |||
16385 | // deadline. It's also a very silly restriction that seriously | |||
16386 | // affects inner classes and which nobody else seems to implement; | |||
16387 | // thus we never diagnose it, not even in -pedantic. | |||
16388 | // | |||
16389 | // But note that we could warn about it: it's always useless to | |||
16390 | // friend one of your own members (it's not, however, worthless to | |||
16391 | // friend a member of an arbitrary specialization of your template). | |||
16392 | ||||
16393 | Decl *D; | |||
16394 | if (!TempParams.empty()) | |||
16395 | D = FriendTemplateDecl::Create(Context, CurContext, Loc, | |||
16396 | TempParams, | |||
16397 | TSI, | |||
16398 | DS.getFriendSpecLoc()); | |||
16399 | else | |||
16400 | D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); | |||
16401 | ||||
16402 | if (!D) | |||
16403 | return nullptr; | |||
16404 | ||||
16405 | D->setAccess(AS_public); | |||
16406 | CurContext->addDecl(D); | |||
16407 | ||||
16408 | return D; | |||
16409 | } | |||
16410 | ||||
16411 | NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, | |||
16412 | MultiTemplateParamsArg TemplateParams) { | |||
16413 | const DeclSpec &DS = D.getDeclSpec(); | |||
16414 | ||||
16415 | assert(DS.isFriendSpecified())((DS.isFriendSpecified()) ? static_cast<void> (0) : __assert_fail ("DS.isFriendSpecified()", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 16415, __PRETTY_FUNCTION__)); | |||
16416 | assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified)((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) ? static_cast <void> (0) : __assert_fail ("DS.getStorageClassSpec() == DeclSpec::SCS_unspecified" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 16416, __PRETTY_FUNCTION__)); | |||
16417 | ||||
16418 | SourceLocation Loc = D.getIdentifierLoc(); | |||
16419 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); | |||
16420 | ||||
16421 | // C++ [class.friend]p1 | |||
16422 | // A friend of a class is a function or class.... | |||
16423 | // Note that this sees through typedefs, which is intended. | |||
16424 | // It *doesn't* see through dependent types, which is correct | |||
16425 | // according to [temp.arg.type]p3: | |||
16426 | // If a declaration acquires a function type through a | |||
16427 | // type dependent on a template-parameter and this causes | |||
16428 | // a declaration that does not use the syntactic form of a | |||
16429 | // function declarator to have a function type, the program | |||
16430 | // is ill-formed. | |||
16431 | if (!TInfo->getType()->isFunctionType()) { | |||
16432 | Diag(Loc, diag::err_unexpected_friend); | |||
16433 | ||||
16434 | // It might be worthwhile to try to recover by creating an | |||
16435 | // appropriate declaration. | |||
16436 | return nullptr; | |||
16437 | } | |||
16438 | ||||
16439 | // C++ [namespace.memdef]p3 | |||
16440 | // - If a friend declaration in a non-local class first declares a | |||
16441 | // class or function, the friend class or function is a member | |||
16442 | // of the innermost enclosing namespace. | |||
16443 | // - The name of the friend is not found by simple name lookup | |||
16444 | // until a matching declaration is provided in that namespace | |||
16445 | // scope (either before or after the class declaration granting | |||
16446 | // friendship). | |||
16447 | // - If a friend function is called, its name may be found by the | |||
16448 | // name lookup that considers functions from namespaces and | |||
16449 | // classes associated with the types of the function arguments. | |||
16450 | // - When looking for a prior declaration of a class or a function | |||
16451 | // declared as a friend, scopes outside the innermost enclosing | |||
16452 | // namespace scope are not considered. | |||
16453 | ||||
16454 | CXXScopeSpec &SS = D.getCXXScopeSpec(); | |||
16455 | DeclarationNameInfo NameInfo = GetNameForDeclarator(D); | |||
16456 | assert(NameInfo.getName())((NameInfo.getName()) ? static_cast<void> (0) : __assert_fail ("NameInfo.getName()", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 16456, __PRETTY_FUNCTION__)); | |||
16457 | ||||
16458 | // Check for unexpanded parameter packs. | |||
16459 | if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || | |||
16460 | DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || | |||
16461 | DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) | |||
16462 | return nullptr; | |||
16463 | ||||
16464 | // The context we found the declaration in, or in which we should | |||
16465 | // create the declaration. | |||
16466 | DeclContext *DC; | |||
16467 | Scope *DCScope = S; | |||
16468 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, | |||
16469 | ForExternalRedeclaration); | |||
16470 | ||||
16471 | // There are five cases here. | |||
16472 | // - There's no scope specifier and we're in a local class. Only look | |||
16473 | // for functions declared in the immediately-enclosing block scope. | |||
16474 | // We recover from invalid scope qualifiers as if they just weren't there. | |||
16475 | FunctionDecl *FunctionContainingLocalClass = nullptr; | |||
16476 | if ((SS.isInvalid() || !SS.isSet()) && | |||
16477 | (FunctionContainingLocalClass = | |||
16478 | cast<CXXRecordDecl>(CurContext)->isLocalClass())) { | |||
16479 | // C++11 [class.friend]p11: | |||
16480 | // If a friend declaration appears in a local class and the name | |||
16481 | // specified is an unqualified name, a prior declaration is | |||
16482 | // looked up without considering scopes that are outside the | |||
16483 | // innermost enclosing non-class scope. For a friend function | |||
16484 | // declaration, if there is no prior declaration, the program is | |||
16485 | // ill-formed. | |||
16486 | ||||
16487 | // Find the innermost enclosing non-class scope. This is the block | |||
16488 | // scope containing the local class definition (or for a nested class, | |||
16489 | // the outer local class). | |||
16490 | DCScope = S->getFnParent(); | |||
16491 | ||||
16492 | // Look up the function name in the scope. | |||
16493 | Previous.clear(LookupLocalFriendName); | |||
16494 | LookupName(Previous, S, /*AllowBuiltinCreation*/false); | |||
16495 | ||||
16496 | if (!Previous.empty()) { | |||
16497 | // All possible previous declarations must have the same context: | |||
16498 | // either they were declared at block scope or they are members of | |||
16499 | // one of the enclosing local classes. | |||
16500 | DC = Previous.getRepresentativeDecl()->getDeclContext(); | |||
16501 | } else { | |||
16502 | // This is ill-formed, but provide the context that we would have | |||
16503 | // declared the function in, if we were permitted to, for error recovery. | |||
16504 | DC = FunctionContainingLocalClass; | |||
16505 | } | |||
16506 | adjustContextForLocalExternDecl(DC); | |||
16507 | ||||
16508 | // C++ [class.friend]p6: | |||
16509 | // A function can be defined in a friend declaration of a class if and | |||
16510 | // only if the class is a non-local class (9.8), the function name is | |||
16511 | // unqualified, and the function has namespace scope. | |||
16512 | if (D.isFunctionDefinition()) { | |||
16513 | Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); | |||
16514 | } | |||
16515 | ||||
16516 | // - There's no scope specifier, in which case we just go to the | |||
16517 | // appropriate scope and look for a function or function template | |||
16518 | // there as appropriate. | |||
16519 | } else if (SS.isInvalid() || !SS.isSet()) { | |||
16520 | // C++11 [namespace.memdef]p3: | |||
16521 | // If the name in a friend declaration is neither qualified nor | |||
16522 | // a template-id and the declaration is a function or an | |||
16523 | // elaborated-type-specifier, the lookup to determine whether | |||
16524 | // the entity has been previously declared shall not consider | |||
16525 | // any scopes outside the innermost enclosing namespace. | |||
16526 | bool isTemplateId = | |||
16527 | D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId; | |||
16528 | ||||
16529 | // Find the appropriate context according to the above. | |||
16530 | DC = CurContext; | |||
16531 | ||||
16532 | // Skip class contexts. If someone can cite chapter and verse | |||
16533 | // for this behavior, that would be nice --- it's what GCC and | |||
16534 | // EDG do, and it seems like a reasonable intent, but the spec | |||
16535 | // really only says that checks for unqualified existing | |||
16536 | // declarations should stop at the nearest enclosing namespace, | |||
16537 | // not that they should only consider the nearest enclosing | |||
16538 | // namespace. | |||
16539 | while (DC->isRecord()) | |||
16540 | DC = DC->getParent(); | |||
16541 | ||||
16542 | DeclContext *LookupDC = DC; | |||
16543 | while (LookupDC->isTransparentContext()) | |||
16544 | LookupDC = LookupDC->getParent(); | |||
16545 | ||||
16546 | while (true) { | |||
16547 | LookupQualifiedName(Previous, LookupDC); | |||
16548 | ||||
16549 | if (!Previous.empty()) { | |||
16550 | DC = LookupDC; | |||
16551 | break; | |||
16552 | } | |||
16553 | ||||
16554 | if (isTemplateId) { | |||
16555 | if (isa<TranslationUnitDecl>(LookupDC)) break; | |||
16556 | } else { | |||
16557 | if (LookupDC->isFileContext()) break; | |||
16558 | } | |||
16559 | LookupDC = LookupDC->getParent(); | |||
16560 | } | |||
16561 | ||||
16562 | DCScope = getScopeForDeclContext(S, DC); | |||
16563 | ||||
16564 | // - There's a non-dependent scope specifier, in which case we | |||
16565 | // compute it and do a previous lookup there for a function | |||
16566 | // or function template. | |||
16567 | } else if (!SS.getScopeRep()->isDependent()) { | |||
16568 | DC = computeDeclContext(SS); | |||
16569 | if (!DC) return nullptr; | |||
16570 | ||||
16571 | if (RequireCompleteDeclContext(SS, DC)) return nullptr; | |||
16572 | ||||
16573 | LookupQualifiedName(Previous, DC); | |||
16574 | ||||
16575 | // C++ [class.friend]p1: A friend of a class is a function or | |||
16576 | // class that is not a member of the class . . . | |||
16577 | if (DC->Equals(CurContext)) | |||
16578 | Diag(DS.getFriendSpecLoc(), | |||
16579 | getLangOpts().CPlusPlus11 ? | |||
16580 | diag::warn_cxx98_compat_friend_is_member : | |||
16581 | diag::err_friend_is_member); | |||
16582 | ||||
16583 | if (D.isFunctionDefinition()) { | |||
16584 | // C++ [class.friend]p6: | |||
16585 | // A function can be defined in a friend declaration of a class if and | |||
16586 | // only if the class is a non-local class (9.8), the function name is | |||
16587 | // unqualified, and the function has namespace scope. | |||
16588 | // | |||
16589 | // FIXME: We should only do this if the scope specifier names the | |||
16590 | // innermost enclosing namespace; otherwise the fixit changes the | |||
16591 | // meaning of the code. | |||
16592 | SemaDiagnosticBuilder DB | |||
16593 | = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); | |||
16594 | ||||
16595 | DB << SS.getScopeRep(); | |||
16596 | if (DC->isFileContext()) | |||
16597 | DB << FixItHint::CreateRemoval(SS.getRange()); | |||
16598 | SS.clear(); | |||
16599 | } | |||
16600 | ||||
16601 | // - There's a scope specifier that does not match any template | |||
16602 | // parameter lists, in which case we use some arbitrary context, | |||
16603 | // create a method or method template, and wait for instantiation. | |||
16604 | // - There's a scope specifier that does match some template | |||
16605 | // parameter lists, which we don't handle right now. | |||
16606 | } else { | |||
16607 | if (D.isFunctionDefinition()) { | |||
16608 | // C++ [class.friend]p6: | |||
16609 | // A function can be defined in a friend declaration of a class if and | |||
16610 | // only if the class is a non-local class (9.8), the function name is | |||
16611 | // unqualified, and the function has namespace scope. | |||
16612 | Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) | |||
16613 | << SS.getScopeRep(); | |||
16614 | } | |||
16615 | ||||
16616 | DC = CurContext; | |||
16617 | assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?")((isa<CXXRecordDecl>(DC) && "friend declaration not in class?" ) ? static_cast<void> (0) : __assert_fail ("isa<CXXRecordDecl>(DC) && \"friend declaration not in class?\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 16617, __PRETTY_FUNCTION__)); | |||
16618 | } | |||
16619 | ||||
16620 | if (!DC->isRecord()) { | |||
16621 | int DiagArg = -1; | |||
16622 | switch (D.getName().getKind()) { | |||
16623 | case UnqualifiedIdKind::IK_ConstructorTemplateId: | |||
16624 | case UnqualifiedIdKind::IK_ConstructorName: | |||
16625 | DiagArg = 0; | |||
16626 | break; | |||
16627 | case UnqualifiedIdKind::IK_DestructorName: | |||
16628 | DiagArg = 1; | |||
16629 | break; | |||
16630 | case UnqualifiedIdKind::IK_ConversionFunctionId: | |||
16631 | DiagArg = 2; | |||
16632 | break; | |||
16633 | case UnqualifiedIdKind::IK_DeductionGuideName: | |||
16634 | DiagArg = 3; | |||
16635 | break; | |||
16636 | case UnqualifiedIdKind::IK_Identifier: | |||
16637 | case UnqualifiedIdKind::IK_ImplicitSelfParam: | |||
16638 | case UnqualifiedIdKind::IK_LiteralOperatorId: | |||
16639 | case UnqualifiedIdKind::IK_OperatorFunctionId: | |||
16640 | case UnqualifiedIdKind::IK_TemplateId: | |||
16641 | break; | |||
16642 | } | |||
16643 | // This implies that it has to be an operator or function. | |||
16644 | if (DiagArg >= 0) { | |||
16645 | Diag(Loc, diag::err_introducing_special_friend) << DiagArg; | |||
16646 | return nullptr; | |||
16647 | } | |||
16648 | } | |||
16649 | ||||
16650 | // FIXME: This is an egregious hack to cope with cases where the scope stack | |||
16651 | // does not contain the declaration context, i.e., in an out-of-line | |||
16652 | // definition of a class. | |||
16653 | Scope FakeDCScope(S, Scope::DeclScope, Diags); | |||
16654 | if (!DCScope) { | |||
16655 | FakeDCScope.setEntity(DC); | |||
16656 | DCScope = &FakeDCScope; | |||
16657 | } | |||
16658 | ||||
16659 | bool AddToScope = true; | |||
16660 | NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, | |||
16661 | TemplateParams, AddToScope); | |||
16662 | if (!ND) return nullptr; | |||
16663 | ||||
16664 | assert(ND->getLexicalDeclContext() == CurContext)((ND->getLexicalDeclContext() == CurContext) ? static_cast <void> (0) : __assert_fail ("ND->getLexicalDeclContext() == CurContext" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 16664, __PRETTY_FUNCTION__)); | |||
16665 | ||||
16666 | // If we performed typo correction, we might have added a scope specifier | |||
16667 | // and changed the decl context. | |||
16668 | DC = ND->getDeclContext(); | |||
16669 | ||||
16670 | // Add the function declaration to the appropriate lookup tables, | |||
16671 | // adjusting the redeclarations list as necessary. We don't | |||
16672 | // want to do this yet if the friending class is dependent. | |||
16673 | // | |||
16674 | // Also update the scope-based lookup if the target context's | |||
16675 | // lookup context is in lexical scope. | |||
16676 | if (!CurContext->isDependentContext()) { | |||
16677 | DC = DC->getRedeclContext(); | |||
16678 | DC->makeDeclVisibleInContext(ND); | |||
16679 | if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) | |||
16680 | PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); | |||
16681 | } | |||
16682 | ||||
16683 | FriendDecl *FrD = FriendDecl::Create(Context, CurContext, | |||
16684 | D.getIdentifierLoc(), ND, | |||
16685 | DS.getFriendSpecLoc()); | |||
16686 | FrD->setAccess(AS_public); | |||
16687 | CurContext->addDecl(FrD); | |||
16688 | ||||
16689 | if (ND->isInvalidDecl()) { | |||
16690 | FrD->setInvalidDecl(); | |||
16691 | } else { | |||
16692 | if (DC->isRecord()) CheckFriendAccess(ND); | |||
16693 | ||||
16694 | FunctionDecl *FD; | |||
16695 | if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) | |||
16696 | FD = FTD->getTemplatedDecl(); | |||
16697 | else | |||
16698 | FD = cast<FunctionDecl>(ND); | |||
16699 | ||||
16700 | // C++11 [dcl.fct.default]p4: If a friend declaration specifies a | |||
16701 | // default argument expression, that declaration shall be a definition | |||
16702 | // and shall be the only declaration of the function or function | |||
16703 | // template in the translation unit. | |||
16704 | if (functionDeclHasDefaultArgument(FD)) { | |||
16705 | // We can't look at FD->getPreviousDecl() because it may not have been set | |||
16706 | // if we're in a dependent context. If the function is known to be a | |||
16707 | // redeclaration, we will have narrowed Previous down to the right decl. | |||
16708 | if (D.isRedeclaration()) { | |||
16709 | Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_redeclared); | |||
16710 | Diag(Previous.getRepresentativeDecl()->getLocation(), | |||
16711 | diag::note_previous_declaration); | |||
16712 | } else if (!D.isFunctionDefinition()) | |||
16713 | Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_must_be_def); | |||
16714 | } | |||
16715 | ||||
16716 | // Mark templated-scope function declarations as unsupported. | |||
16717 | if (FD->getNumTemplateParameterLists() && SS.isValid()) { | |||
16718 | Diag(FD->getLocation(), diag::warn_template_qualified_friend_unsupported) | |||
16719 | << SS.getScopeRep() << SS.getRange() | |||
16720 | << cast<CXXRecordDecl>(CurContext); | |||
16721 | FrD->setUnsupportedFriend(true); | |||
16722 | } | |||
16723 | } | |||
16724 | ||||
16725 | return ND; | |||
16726 | } | |||
16727 | ||||
16728 | void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { | |||
16729 | AdjustDeclIfTemplate(Dcl); | |||
16730 | ||||
16731 | FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl); | |||
16732 | if (!Fn) { | |||
16733 | Diag(DelLoc, diag::err_deleted_non_function); | |||
16734 | return; | |||
16735 | } | |||
16736 | ||||
16737 | // Deleted function does not have a body. | |||
16738 | Fn->setWillHaveBody(false); | |||
16739 | ||||
16740 | if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { | |||
16741 | // Don't consider the implicit declaration we generate for explicit | |||
16742 | // specializations. FIXME: Do not generate these implicit declarations. | |||
16743 | if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization || | |||
16744 | Prev->getPreviousDecl()) && | |||
16745 | !Prev->isDefined()) { | |||
16746 | Diag(DelLoc, diag::err_deleted_decl_not_first); | |||
16747 | Diag(Prev->getLocation().isInvalid() ? DelLoc : Prev->getLocation(), | |||
16748 | Prev->isImplicit() ? diag::note_previous_implicit_declaration | |||
16749 | : diag::note_previous_declaration); | |||
16750 | // We can't recover from this; the declaration might have already | |||
16751 | // been used. | |||
16752 | Fn->setInvalidDecl(); | |||
16753 | return; | |||
16754 | } | |||
16755 | ||||
16756 | // To maintain the invariant that functions are only deleted on their first | |||
16757 | // declaration, mark the implicitly-instantiated declaration of the | |||
16758 | // explicitly-specialized function as deleted instead of marking the | |||
16759 | // instantiated redeclaration. | |||
16760 | Fn = Fn->getCanonicalDecl(); | |||
16761 | } | |||
16762 | ||||
16763 | // dllimport/dllexport cannot be deleted. | |||
16764 | if (const InheritableAttr *DLLAttr = getDLLAttr(Fn)) { | |||
16765 | Diag(Fn->getLocation(), diag::err_attribute_dll_deleted) << DLLAttr; | |||
16766 | Fn->setInvalidDecl(); | |||
16767 | } | |||
16768 | ||||
16769 | // C++11 [basic.start.main]p3: | |||
16770 | // A program that defines main as deleted [...] is ill-formed. | |||
16771 | if (Fn->isMain()) | |||
16772 | Diag(DelLoc, diag::err_deleted_main); | |||
16773 | ||||
16774 | // C++11 [dcl.fct.def.delete]p4: | |||
16775 | // A deleted function is implicitly inline. | |||
16776 | Fn->setImplicitlyInline(); | |||
16777 | Fn->setDeletedAsWritten(); | |||
16778 | } | |||
16779 | ||||
16780 | void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { | |||
16781 | if (!Dcl || Dcl->isInvalidDecl()) | |||
16782 | return; | |||
16783 | ||||
16784 | auto *FD = dyn_cast<FunctionDecl>(Dcl); | |||
16785 | if (!FD) { | |||
16786 | if (auto *FTD = dyn_cast<FunctionTemplateDecl>(Dcl)) { | |||
16787 | if (getDefaultedFunctionKind(FTD->getTemplatedDecl()).isComparison()) { | |||
16788 | Diag(DefaultLoc, diag::err_defaulted_comparison_template); | |||
16789 | return; | |||
16790 | } | |||
16791 | } | |||
16792 | ||||
16793 | Diag(DefaultLoc, diag::err_default_special_members) | |||
16794 | << getLangOpts().CPlusPlus20; | |||
16795 | return; | |||
16796 | } | |||
16797 | ||||
16798 | // Reject if this can't possibly be a defaultable function. | |||
16799 | DefaultedFunctionKind DefKind = getDefaultedFunctionKind(FD); | |||
16800 | if (!DefKind && | |||
16801 | // A dependent function that doesn't locally look defaultable can | |||
16802 | // still instantiate to a defaultable function if it's a constructor | |||
16803 | // or assignment operator. | |||
16804 | (!FD->isDependentContext() || | |||
16805 | (!isa<CXXConstructorDecl>(FD) && | |||
16806 | FD->getDeclName().getCXXOverloadedOperator() != OO_Equal))) { | |||
16807 | Diag(DefaultLoc, diag::err_default_special_members) | |||
16808 | << getLangOpts().CPlusPlus20; | |||
16809 | return; | |||
16810 | } | |||
16811 | ||||
16812 | if (DefKind.isComparison() && | |||
16813 | !isa<CXXRecordDecl>(FD->getLexicalDeclContext())) { | |||
16814 | Diag(FD->getLocation(), diag::err_defaulted_comparison_out_of_class) | |||
16815 | << (int)DefKind.asComparison(); | |||
16816 | return; | |||
16817 | } | |||
16818 | ||||
16819 | // Issue compatibility warning. We already warned if the operator is | |||
16820 | // 'operator<=>' when parsing the '<=>' token. | |||
16821 | if (DefKind.isComparison() && | |||
16822 | DefKind.asComparison() != DefaultedComparisonKind::ThreeWay) { | |||
16823 | Diag(DefaultLoc, getLangOpts().CPlusPlus20 | |||
16824 | ? diag::warn_cxx17_compat_defaulted_comparison | |||
16825 | : diag::ext_defaulted_comparison); | |||
16826 | } | |||
16827 | ||||
16828 | FD->setDefaulted(); | |||
16829 | FD->setExplicitlyDefaulted(); | |||
16830 | ||||
16831 | // Defer checking functions that are defaulted in a dependent context. | |||
16832 | if (FD->isDependentContext()) | |||
16833 | return; | |||
16834 | ||||
16835 | // Unset that we will have a body for this function. We might not, | |||
16836 | // if it turns out to be trivial, and we don't need this marking now | |||
16837 | // that we've marked it as defaulted. | |||
16838 | FD->setWillHaveBody(false); | |||
16839 | ||||
16840 | // If this definition appears within the record, do the checking when | |||
16841 | // the record is complete. This is always the case for a defaulted | |||
16842 | // comparison. | |||
16843 | if (DefKind.isComparison()) | |||
16844 | return; | |||
16845 | auto *MD = cast<CXXMethodDecl>(FD); | |||
16846 | ||||
16847 | const FunctionDecl *Primary = FD; | |||
16848 | if (const FunctionDecl *Pattern = FD->getTemplateInstantiationPattern()) | |||
16849 | // Ask the template instantiation pattern that actually had the | |||
16850 | // '= default' on it. | |||
16851 | Primary = Pattern; | |||
16852 | ||||
16853 | // If the method was defaulted on its first declaration, we will have | |||
16854 | // already performed the checking in CheckCompletedCXXClass. Such a | |||
16855 | // declaration doesn't trigger an implicit definition. | |||
16856 | if (Primary->getCanonicalDecl()->isDefaulted()) | |||
16857 | return; | |||
16858 | ||||
16859 | // FIXME: Once we support defining comparisons out of class, check for a | |||
16860 | // defaulted comparison here. | |||
16861 | if (CheckExplicitlyDefaultedSpecialMember(MD, DefKind.asSpecialMember())) | |||
16862 | MD->setInvalidDecl(); | |||
16863 | else | |||
16864 | DefineDefaultedFunction(*this, MD, DefaultLoc); | |||
16865 | } | |||
16866 | ||||
16867 | static void SearchForReturnInStmt(Sema &Self, Stmt *S) { | |||
16868 | for (Stmt *SubStmt : S->children()) { | |||
16869 | if (!SubStmt) | |||
16870 | continue; | |||
16871 | if (isa<ReturnStmt>(SubStmt)) | |||
16872 | Self.Diag(SubStmt->getBeginLoc(), | |||
16873 | diag::err_return_in_constructor_handler); | |||
16874 | if (!isa<Expr>(SubStmt)) | |||
16875 | SearchForReturnInStmt(Self, SubStmt); | |||
16876 | } | |||
16877 | } | |||
16878 | ||||
16879 | void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { | |||
16880 | for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { | |||
16881 | CXXCatchStmt *Handler = TryBlock->getHandler(I); | |||
16882 | SearchForReturnInStmt(*this, Handler); | |||
16883 | } | |||
16884 | } | |||
16885 | ||||
16886 | bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, | |||
16887 | const CXXMethodDecl *Old) { | |||
16888 | const auto *NewFT = New->getType()->castAs<FunctionProtoType>(); | |||
16889 | const auto *OldFT = Old->getType()->castAs<FunctionProtoType>(); | |||
16890 | ||||
16891 | if (OldFT->hasExtParameterInfos()) { | |||
16892 | for (unsigned I = 0, E = OldFT->getNumParams(); I != E; ++I) | |||
16893 | // A parameter of the overriding method should be annotated with noescape | |||
16894 | // if the corresponding parameter of the overridden method is annotated. | |||
16895 | if (OldFT->getExtParameterInfo(I).isNoEscape() && | |||
16896 | !NewFT->getExtParameterInfo(I).isNoEscape()) { | |||
16897 | Diag(New->getParamDecl(I)->getLocation(), | |||
16898 | diag::warn_overriding_method_missing_noescape); | |||
16899 | Diag(Old->getParamDecl(I)->getLocation(), | |||
16900 | diag::note_overridden_marked_noescape); | |||
16901 | } | |||
16902 | } | |||
16903 | ||||
16904 | // Virtual overrides must have the same code_seg. | |||
16905 | const auto *OldCSA = Old->getAttr<CodeSegAttr>(); | |||
16906 | const auto *NewCSA = New->getAttr<CodeSegAttr>(); | |||
16907 | if ((NewCSA || OldCSA) && | |||
16908 | (!OldCSA || !NewCSA || NewCSA->getName() != OldCSA->getName())) { | |||
16909 | Diag(New->getLocation(), diag::err_mismatched_code_seg_override); | |||
16910 | Diag(Old->getLocation(), diag::note_previous_declaration); | |||
16911 | return true; | |||
16912 | } | |||
16913 | ||||
16914 | CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv(); | |||
16915 | ||||
16916 | // If the calling conventions match, everything is fine | |||
16917 | if (NewCC == OldCC) | |||
16918 | return false; | |||
16919 | ||||
16920 | // If the calling conventions mismatch because the new function is static, | |||
16921 | // suppress the calling convention mismatch error; the error about static | |||
16922 | // function override (err_static_overrides_virtual from | |||
16923 | // Sema::CheckFunctionDeclaration) is more clear. | |||
16924 | if (New->getStorageClass() == SC_Static) | |||
16925 | return false; | |||
16926 | ||||
16927 | Diag(New->getLocation(), | |||
16928 | diag::err_conflicting_overriding_cc_attributes) | |||
16929 | << New->getDeclName() << New->getType() << Old->getType(); | |||
16930 | Diag(Old->getLocation(), diag::note_overridden_virtual_function); | |||
16931 | return true; | |||
16932 | } | |||
16933 | ||||
16934 | bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, | |||
16935 | const CXXMethodDecl *Old) { | |||
16936 | QualType NewTy = New->getType()->castAs<FunctionType>()->getReturnType(); | |||
16937 | QualType OldTy = Old->getType()->castAs<FunctionType>()->getReturnType(); | |||
16938 | ||||
16939 | if (Context.hasSameType(NewTy, OldTy) || | |||
16940 | NewTy->isDependentType() || OldTy->isDependentType()) | |||
16941 | return false; | |||
16942 | ||||
16943 | // Check if the return types are covariant | |||
16944 | QualType NewClassTy, OldClassTy; | |||
16945 | ||||
16946 | /// Both types must be pointers or references to classes. | |||
16947 | if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { | |||
16948 | if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { | |||
16949 | NewClassTy = NewPT->getPointeeType(); | |||
16950 | OldClassTy = OldPT->getPointeeType(); | |||
16951 | } | |||
16952 | } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { | |||
16953 | if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { | |||
16954 | if (NewRT->getTypeClass() == OldRT->getTypeClass()) { | |||
16955 | NewClassTy = NewRT->getPointeeType(); | |||
16956 | OldClassTy = OldRT->getPointeeType(); | |||
16957 | } | |||
16958 | } | |||
16959 | } | |||
16960 | ||||
16961 | // The return types aren't either both pointers or references to a class type. | |||
16962 | if (NewClassTy.isNull()) { | |||
16963 | Diag(New->getLocation(), | |||
16964 | diag::err_different_return_type_for_overriding_virtual_function) | |||
16965 | << New->getDeclName() << NewTy << OldTy | |||
16966 | << New->getReturnTypeSourceRange(); | |||
16967 | Diag(Old->getLocation(), diag::note_overridden_virtual_function) | |||
16968 | << Old->getReturnTypeSourceRange(); | |||
16969 | ||||
16970 | return true; | |||
16971 | } | |||
16972 | ||||
16973 | if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { | |||
16974 | // C++14 [class.virtual]p8: | |||
16975 | // If the class type in the covariant return type of D::f differs from | |||
16976 | // that of B::f, the class type in the return type of D::f shall be | |||
16977 | // complete at the point of declaration of D::f or shall be the class | |||
16978 | // type D. | |||
16979 | if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { | |||
16980 | if (!RT->isBeingDefined() && | |||
16981 | RequireCompleteType(New->getLocation(), NewClassTy, | |||
16982 | diag::err_covariant_return_incomplete, | |||
16983 | New->getDeclName())) | |||
16984 | return true; | |||
16985 | } | |||
16986 | ||||
16987 | // Check if the new class derives from the old class. | |||
16988 | if (!IsDerivedFrom(New->getLocation(), NewClassTy, OldClassTy)) { | |||
16989 | Diag(New->getLocation(), diag::err_covariant_return_not_derived) | |||
16990 | << New->getDeclName() << NewTy << OldTy | |||
16991 | << New->getReturnTypeSourceRange(); | |||
16992 | Diag(Old->getLocation(), diag::note_overridden_virtual_function) | |||
16993 | << Old->getReturnTypeSourceRange(); | |||
16994 | return true; | |||
16995 | } | |||
16996 | ||||
16997 | // Check if we the conversion from derived to base is valid. | |||
16998 | if (CheckDerivedToBaseConversion( | |||
16999 | NewClassTy, OldClassTy, | |||
17000 | diag::err_covariant_return_inaccessible_base, | |||
17001 | diag::err_covariant_return_ambiguous_derived_to_base_conv, | |||
17002 | New->getLocation(), New->getReturnTypeSourceRange(), | |||
17003 | New->getDeclName(), nullptr)) { | |||
17004 | // FIXME: this note won't trigger for delayed access control | |||
17005 | // diagnostics, and it's impossible to get an undelayed error | |||
17006 | // here from access control during the original parse because | |||
17007 | // the ParsingDeclSpec/ParsingDeclarator are still in scope. | |||
17008 | Diag(Old->getLocation(), diag::note_overridden_virtual_function) | |||
17009 | << Old->getReturnTypeSourceRange(); | |||
17010 | return true; | |||
17011 | } | |||
17012 | } | |||
17013 | ||||
17014 | // The qualifiers of the return types must be the same. | |||
17015 | if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { | |||
17016 | Diag(New->getLocation(), | |||
17017 | diag::err_covariant_return_type_different_qualifications) | |||
17018 | << New->getDeclName() << NewTy << OldTy | |||
17019 | << New->getReturnTypeSourceRange(); | |||
17020 | Diag(Old->getLocation(), diag::note_overridden_virtual_function) | |||
17021 | << Old->getReturnTypeSourceRange(); | |||
17022 | return true; | |||
17023 | } | |||
17024 | ||||
17025 | ||||
17026 | // The new class type must have the same or less qualifiers as the old type. | |||
17027 | if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { | |||
17028 | Diag(New->getLocation(), | |||
17029 | diag::err_covariant_return_type_class_type_more_qualified) | |||
17030 | << New->getDeclName() << NewTy << OldTy | |||
17031 | << New->getReturnTypeSourceRange(); | |||
17032 | Diag(Old->getLocation(), diag::note_overridden_virtual_function) | |||
17033 | << Old->getReturnTypeSourceRange(); | |||
17034 | return true; | |||
17035 | } | |||
17036 | ||||
17037 | return false; | |||
17038 | } | |||
17039 | ||||
17040 | /// Mark the given method pure. | |||
17041 | /// | |||
17042 | /// \param Method the method to be marked pure. | |||
17043 | /// | |||
17044 | /// \param InitRange the source range that covers the "0" initializer. | |||
17045 | bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { | |||
17046 | SourceLocation EndLoc = InitRange.getEnd(); | |||
17047 | if (EndLoc.isValid()) | |||
17048 | Method->setRangeEnd(EndLoc); | |||
17049 | ||||
17050 | if (Method->isVirtual() || Method->getParent()->isDependentContext()) { | |||
17051 | Method->setPure(); | |||
17052 | return false; | |||
17053 | } | |||
17054 | ||||
17055 | if (!Method->isInvalidDecl()) | |||
17056 | Diag(Method->getLocation(), diag::err_non_virtual_pure) | |||
17057 | << Method->getDeclName() << InitRange; | |||
17058 | return true; | |||
17059 | } | |||
17060 | ||||
17061 | void Sema::ActOnPureSpecifier(Decl *D, SourceLocation ZeroLoc) { | |||
17062 | if (D->getFriendObjectKind()) | |||
17063 | Diag(D->getLocation(), diag::err_pure_friend); | |||
17064 | else if (auto *M = dyn_cast<CXXMethodDecl>(D)) | |||
17065 | CheckPureMethod(M, ZeroLoc); | |||
17066 | else | |||
17067 | Diag(D->getLocation(), diag::err_illegal_initializer); | |||
17068 | } | |||
17069 | ||||
17070 | /// Determine whether the given declaration is a global variable or | |||
17071 | /// static data member. | |||
17072 | static bool isNonlocalVariable(const Decl *D) { | |||
17073 | if (const VarDecl *Var = dyn_cast_or_null<VarDecl>(D)) | |||
17074 | return Var->hasGlobalStorage(); | |||
17075 | ||||
17076 | return false; | |||
17077 | } | |||
17078 | ||||
17079 | /// Invoked when we are about to parse an initializer for the declaration | |||
17080 | /// 'Dcl'. | |||
17081 | /// | |||
17082 | /// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a | |||
17083 | /// static data member of class X, names should be looked up in the scope of | |||
17084 | /// class X. If the declaration had a scope specifier, a scope will have | |||
17085 | /// been created and passed in for this purpose. Otherwise, S will be null. | |||
17086 | void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { | |||
17087 | // If there is no declaration, there was an error parsing it. | |||
17088 | if (!D || D->isInvalidDecl()) | |||
17089 | return; | |||
17090 | ||||
17091 | // We will always have a nested name specifier here, but this declaration | |||
17092 | // might not be out of line if the specifier names the current namespace: | |||
17093 | // extern int n; | |||
17094 | // int ::n = 0; | |||
17095 | if (S && D->isOutOfLine()) | |||
17096 | EnterDeclaratorContext(S, D->getDeclContext()); | |||
17097 | ||||
17098 | // If we are parsing the initializer for a static data member, push a | |||
17099 | // new expression evaluation context that is associated with this static | |||
17100 | // data member. | |||
17101 | if (isNonlocalVariable(D)) | |||
17102 | PushExpressionEvaluationContext( | |||
17103 | ExpressionEvaluationContext::PotentiallyEvaluated, D); | |||
17104 | } | |||
17105 | ||||
17106 | /// Invoked after we are finished parsing an initializer for the declaration D. | |||
17107 | void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { | |||
17108 | // If there is no declaration, there was an error parsing it. | |||
17109 | if (!D || D->isInvalidDecl()) | |||
17110 | return; | |||
17111 | ||||
17112 | if (isNonlocalVariable(D)) | |||
17113 | PopExpressionEvaluationContext(); | |||
17114 | ||||
17115 | if (S && D->isOutOfLine()) | |||
17116 | ExitDeclaratorContext(S); | |||
17117 | } | |||
17118 | ||||
17119 | /// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a | |||
17120 | /// C++ if/switch/while/for statement. | |||
17121 | /// e.g: "if (int x = f()) {...}" | |||
17122 | DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { | |||
17123 | // C++ 6.4p2: | |||
17124 | // The declarator shall not specify a function or an array. | |||
17125 | // The type-specifier-seq shall not contain typedef and shall not declare a | |||
17126 | // new class or enumeration. | |||
17127 | assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&((D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && "Parser allowed 'typedef' as storage class of condition decl." ) ? static_cast<void> (0) : __assert_fail ("D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && \"Parser allowed 'typedef' as storage class of condition decl.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 17128, __PRETTY_FUNCTION__)) | |||
17128 | "Parser allowed 'typedef' as storage class of condition decl.")((D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && "Parser allowed 'typedef' as storage class of condition decl." ) ? static_cast<void> (0) : __assert_fail ("D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && \"Parser allowed 'typedef' as storage class of condition decl.\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 17128, __PRETTY_FUNCTION__)); | |||
17129 | ||||
17130 | Decl *Dcl = ActOnDeclarator(S, D); | |||
17131 | if (!Dcl) | |||
17132 | return true; | |||
17133 | ||||
17134 | if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. | |||
17135 | Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) | |||
17136 | << D.getSourceRange(); | |||
17137 | return true; | |||
17138 | } | |||
17139 | ||||
17140 | return Dcl; | |||
17141 | } | |||
17142 | ||||
17143 | void Sema::LoadExternalVTableUses() { | |||
17144 | if (!ExternalSource) | |||
17145 | return; | |||
17146 | ||||
17147 | SmallVector<ExternalVTableUse, 4> VTables; | |||
17148 | ExternalSource->ReadUsedVTables(VTables); | |||
17149 | SmallVector<VTableUse, 4> NewUses; | |||
17150 | for (unsigned I = 0, N = VTables.size(); I != N; ++I) { | |||
17151 | llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos | |||
17152 | = VTablesUsed.find(VTables[I].Record); | |||
17153 | // Even if a definition wasn't required before, it may be required now. | |||
17154 | if (Pos != VTablesUsed.end()) { | |||
17155 | if (!Pos->second && VTables[I].DefinitionRequired) | |||
17156 | Pos->second = true; | |||
17157 | continue; | |||
17158 | } | |||
17159 | ||||
17160 | VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; | |||
17161 | NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); | |||
17162 | } | |||
17163 | ||||
17164 | VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); | |||
17165 | } | |||
17166 | ||||
17167 | void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, | |||
17168 | bool DefinitionRequired) { | |||
17169 | // Ignore any vtable uses in unevaluated operands or for classes that do | |||
17170 | // not have a vtable. | |||
17171 | if (!Class->isDynamicClass() || Class->isDependentContext() || | |||
17172 | CurContext->isDependentContext() || isUnevaluatedContext()) | |||
17173 | return; | |||
17174 | // Do not mark as used if compiling for the device outside of the target | |||
17175 | // region. | |||
17176 | if (TUKind != TU_Prefix && LangOpts.OpenMP && LangOpts.OpenMPIsDevice && | |||
17177 | !isInOpenMPDeclareTargetContext() && | |||
17178 | !isInOpenMPTargetExecutionDirective()) { | |||
17179 | if (!DefinitionRequired) | |||
17180 | MarkVirtualMembersReferenced(Loc, Class); | |||
17181 | return; | |||
17182 | } | |||
17183 | ||||
17184 | // Try to insert this class into the map. | |||
17185 | LoadExternalVTableUses(); | |||
17186 | Class = Class->getCanonicalDecl(); | |||
17187 | std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> | |||
17188 | Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); | |||
17189 | if (!Pos.second) { | |||
17190 | // If we already had an entry, check to see if we are promoting this vtable | |||
17191 | // to require a definition. If so, we need to reappend to the VTableUses | |||
17192 | // list, since we may have already processed the first entry. | |||
17193 | if (DefinitionRequired && !Pos.first->second) { | |||
17194 | Pos.first->second = true; | |||
17195 | } else { | |||
17196 | // Otherwise, we can early exit. | |||
17197 | return; | |||
17198 | } | |||
17199 | } else { | |||
17200 | // The Microsoft ABI requires that we perform the destructor body | |||
17201 | // checks (i.e. operator delete() lookup) when the vtable is marked used, as | |||
17202 | // the deleting destructor is emitted with the vtable, not with the | |||
17203 | // destructor definition as in the Itanium ABI. | |||
17204 | if (Context.getTargetInfo().getCXXABI().isMicrosoft()) { | |||
17205 | CXXDestructorDecl *DD = Class->getDestructor(); | |||
17206 | if (DD && DD->isVirtual() && !DD->isDeleted()) { | |||
17207 | if (Class->hasUserDeclaredDestructor() && !DD->isDefined()) { | |||
17208 | // If this is an out-of-line declaration, marking it referenced will | |||
17209 | // not do anything. Manually call CheckDestructor to look up operator | |||
17210 | // delete(). | |||
17211 | ContextRAII SavedContext(*this, DD); | |||
17212 | CheckDestructor(DD); | |||
17213 | } else { | |||
17214 | MarkFunctionReferenced(Loc, Class->getDestructor()); | |||
17215 | } | |||
17216 | } | |||
17217 | } | |||
17218 | } | |||
17219 | ||||
17220 | // Local classes need to have their virtual members marked | |||
17221 | // immediately. For all other classes, we mark their virtual members | |||
17222 | // at the end of the translation unit. | |||
17223 | if (Class->isLocalClass()) | |||
17224 | MarkVirtualMembersReferenced(Loc, Class); | |||
17225 | else | |||
17226 | VTableUses.push_back(std::make_pair(Class, Loc)); | |||
17227 | } | |||
17228 | ||||
17229 | bool Sema::DefineUsedVTables() { | |||
17230 | LoadExternalVTableUses(); | |||
17231 | if (VTableUses.empty()) | |||
17232 | return false; | |||
17233 | ||||
17234 | // Note: The VTableUses vector could grow as a result of marking | |||
17235 | // the members of a class as "used", so we check the size each | |||
17236 | // time through the loop and prefer indices (which are stable) to | |||
17237 | // iterators (which are not). | |||
17238 | bool DefinedAnything = false; | |||
17239 | for (unsigned I = 0; I != VTableUses.size(); ++I) { | |||
17240 | CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); | |||
17241 | if (!Class) | |||
17242 | continue; | |||
17243 | TemplateSpecializationKind ClassTSK = | |||
17244 | Class->getTemplateSpecializationKind(); | |||
17245 | ||||
17246 | SourceLocation Loc = VTableUses[I].second; | |||
17247 | ||||
17248 | bool DefineVTable = true; | |||
17249 | ||||
17250 | // If this class has a key function, but that key function is | |||
17251 | // defined in another translation unit, we don't need to emit the | |||
17252 | // vtable even though we're using it. | |||
17253 | const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class); | |||
17254 | if (KeyFunction && !KeyFunction->hasBody()) { | |||
17255 | // The key function is in another translation unit. | |||
17256 | DefineVTable = false; | |||
17257 | TemplateSpecializationKind TSK = | |||
17258 | KeyFunction->getTemplateSpecializationKind(); | |||
17259 | assert(TSK != TSK_ExplicitInstantiationDefinition &&((TSK != TSK_ExplicitInstantiationDefinition && TSK != TSK_ImplicitInstantiation && "Instantiations don't have key functions" ) ? static_cast<void> (0) : __assert_fail ("TSK != TSK_ExplicitInstantiationDefinition && TSK != TSK_ImplicitInstantiation && \"Instantiations don't have key functions\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 17261, __PRETTY_FUNCTION__)) | |||
17260 | TSK != TSK_ImplicitInstantiation &&((TSK != TSK_ExplicitInstantiationDefinition && TSK != TSK_ImplicitInstantiation && "Instantiations don't have key functions" ) ? static_cast<void> (0) : __assert_fail ("TSK != TSK_ExplicitInstantiationDefinition && TSK != TSK_ImplicitInstantiation && \"Instantiations don't have key functions\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 17261, __PRETTY_FUNCTION__)) | |||
17261 | "Instantiations don't have key functions")((TSK != TSK_ExplicitInstantiationDefinition && TSK != TSK_ImplicitInstantiation && "Instantiations don't have key functions" ) ? static_cast<void> (0) : __assert_fail ("TSK != TSK_ExplicitInstantiationDefinition && TSK != TSK_ImplicitInstantiation && \"Instantiations don't have key functions\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 17261, __PRETTY_FUNCTION__)); | |||
17262 | (void)TSK; | |||
17263 | } else if (!KeyFunction) { | |||
17264 | // If we have a class with no key function that is the subject | |||
17265 | // of an explicit instantiation declaration, suppress the | |||
17266 | // vtable; it will live with the explicit instantiation | |||
17267 | // definition. | |||
17268 | bool IsExplicitInstantiationDeclaration = | |||
17269 | ClassTSK == TSK_ExplicitInstantiationDeclaration; | |||
17270 | for (auto R : Class->redecls()) { | |||
17271 | TemplateSpecializationKind TSK | |||
17272 | = cast<CXXRecordDecl>(R)->getTemplateSpecializationKind(); | |||
17273 | if (TSK == TSK_ExplicitInstantiationDeclaration) | |||
17274 | IsExplicitInstantiationDeclaration = true; | |||
17275 | else if (TSK == TSK_ExplicitInstantiationDefinition) { | |||
17276 | IsExplicitInstantiationDeclaration = false; | |||
17277 | break; | |||
17278 | } | |||
17279 | } | |||
17280 | ||||
17281 | if (IsExplicitInstantiationDeclaration) | |||
17282 | DefineVTable = false; | |||
17283 | } | |||
17284 | ||||
17285 | // The exception specifications for all virtual members may be needed even | |||
17286 | // if we are not providing an authoritative form of the vtable in this TU. | |||
17287 | // We may choose to emit it available_externally anyway. | |||
17288 | if (!DefineVTable) { | |||
17289 | MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); | |||
17290 | continue; | |||
17291 | } | |||
17292 | ||||
17293 | // Mark all of the virtual members of this class as referenced, so | |||
17294 | // that we can build a vtable. Then, tell the AST consumer that a | |||
17295 | // vtable for this class is required. | |||
17296 | DefinedAnything = true; | |||
17297 | MarkVirtualMembersReferenced(Loc, Class); | |||
17298 | CXXRecordDecl *Canonical = Class->getCanonicalDecl(); | |||
17299 | if (VTablesUsed[Canonical]) | |||
17300 | Consumer.HandleVTable(Class); | |||
17301 | ||||
17302 | // Warn if we're emitting a weak vtable. The vtable will be weak if there is | |||
17303 | // no key function or the key function is inlined. Don't warn in C++ ABIs | |||
17304 | // that lack key functions, since the user won't be able to make one. | |||
17305 | if (Context.getTargetInfo().getCXXABI().hasKeyFunctions() && | |||
17306 | Class->isExternallyVisible() && ClassTSK != TSK_ImplicitInstantiation) { | |||
17307 | const FunctionDecl *KeyFunctionDef = nullptr; | |||
17308 | if (!KeyFunction || (KeyFunction->hasBody(KeyFunctionDef) && | |||
17309 | KeyFunctionDef->isInlined())) { | |||
17310 | Diag(Class->getLocation(), | |||
17311 | ClassTSK == TSK_ExplicitInstantiationDefinition | |||
17312 | ? diag::warn_weak_template_vtable | |||
17313 | : diag::warn_weak_vtable) | |||
17314 | << Class; | |||
17315 | } | |||
17316 | } | |||
17317 | } | |||
17318 | VTableUses.clear(); | |||
17319 | ||||
17320 | return DefinedAnything; | |||
17321 | } | |||
17322 | ||||
17323 | void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, | |||
17324 | const CXXRecordDecl *RD) { | |||
17325 | for (const auto *I : RD->methods()) | |||
17326 | if (I->isVirtual() && !I->isPure()) | |||
17327 | ResolveExceptionSpec(Loc, I->getType()->castAs<FunctionProtoType>()); | |||
17328 | } | |||
17329 | ||||
17330 | void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, | |||
17331 | const CXXRecordDecl *RD, | |||
17332 | bool ConstexprOnly) { | |||
17333 | // Mark all functions which will appear in RD's vtable as used. | |||
17334 | CXXFinalOverriderMap FinalOverriders; | |||
17335 | RD->getFinalOverriders(FinalOverriders); | |||
17336 | for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), | |||
17337 | E = FinalOverriders.end(); | |||
17338 | I != E; ++I) { | |||
17339 | for (OverridingMethods::const_iterator OI = I->second.begin(), | |||
17340 | OE = I->second.end(); | |||
17341 | OI != OE; ++OI) { | |||
17342 | assert(OI->second.size() > 0 && "no final overrider")((OI->second.size() > 0 && "no final overrider" ) ? static_cast<void> (0) : __assert_fail ("OI->second.size() > 0 && \"no final overrider\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 17342, __PRETTY_FUNCTION__)); | |||
17343 | CXXMethodDecl *Overrider = OI->second.front().Method; | |||
17344 | ||||
17345 | // C++ [basic.def.odr]p2: | |||
17346 | // [...] A virtual member function is used if it is not pure. [...] | |||
17347 | if (!Overrider->isPure() && (!ConstexprOnly || Overrider->isConstexpr())) | |||
17348 | MarkFunctionReferenced(Loc, Overrider); | |||
17349 | } | |||
17350 | } | |||
17351 | ||||
17352 | // Only classes that have virtual bases need a VTT. | |||
17353 | if (RD->getNumVBases() == 0) | |||
17354 | return; | |||
17355 | ||||
17356 | for (const auto &I : RD->bases()) { | |||
17357 | const auto *Base = | |||
17358 | cast<CXXRecordDecl>(I.getType()->castAs<RecordType>()->getDecl()); | |||
17359 | if (Base->getNumVBases() == 0) | |||
17360 | continue; | |||
17361 | MarkVirtualMembersReferenced(Loc, Base); | |||
17362 | } | |||
17363 | } | |||
17364 | ||||
17365 | /// SetIvarInitializers - This routine builds initialization ASTs for the | |||
17366 | /// Objective-C implementation whose ivars need be initialized. | |||
17367 | void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { | |||
17368 | if (!getLangOpts().CPlusPlus) | |||
17369 | return; | |||
17370 | if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { | |||
17371 | SmallVector<ObjCIvarDecl*, 8> ivars; | |||
17372 | CollectIvarsToConstructOrDestruct(OID, ivars); | |||
17373 | if (ivars.empty()) | |||
17374 | return; | |||
17375 | SmallVector<CXXCtorInitializer*, 32> AllToInit; | |||
17376 | for (unsigned i = 0; i < ivars.size(); i++) { | |||
17377 | FieldDecl *Field = ivars[i]; | |||
17378 | if (Field->isInvalidDecl()) | |||
17379 | continue; | |||
17380 | ||||
17381 | CXXCtorInitializer *Member; | |||
17382 | InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); | |||
17383 | InitializationKind InitKind = | |||
17384 | InitializationKind::CreateDefault(ObjCImplementation->getLocation()); | |||
17385 | ||||
17386 | InitializationSequence InitSeq(*this, InitEntity, InitKind, None); | |||
17387 | ExprResult MemberInit = | |||
17388 | InitSeq.Perform(*this, InitEntity, InitKind, None); | |||
17389 | MemberInit = MaybeCreateExprWithCleanups(MemberInit); | |||
17390 | // Note, MemberInit could actually come back empty if no initialization | |||
17391 | // is required (e.g., because it would call a trivial default constructor) | |||
17392 | if (!MemberInit.get() || MemberInit.isInvalid()) | |||
17393 | continue; | |||
17394 | ||||
17395 | Member = | |||
17396 | new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), | |||
17397 | SourceLocation(), | |||
17398 | MemberInit.getAs<Expr>(), | |||
17399 | SourceLocation()); | |||
17400 | AllToInit.push_back(Member); | |||
17401 | ||||
17402 | // Be sure that the destructor is accessible and is marked as referenced. | |||
17403 | if (const RecordType *RecordTy = | |||
17404 | Context.getBaseElementType(Field->getType()) | |||
17405 | ->getAs<RecordType>()) { | |||
17406 | CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); | |||
17407 | if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { | |||
17408 | MarkFunctionReferenced(Field->getLocation(), Destructor); | |||
17409 | CheckDestructorAccess(Field->getLocation(), Destructor, | |||
17410 | PDiag(diag::err_access_dtor_ivar) | |||
17411 | << Context.getBaseElementType(Field->getType())); | |||
17412 | } | |||
17413 | } | |||
17414 | } | |||
17415 | ObjCImplementation->setIvarInitializers(Context, | |||
17416 | AllToInit.data(), AllToInit.size()); | |||
17417 | } | |||
17418 | } | |||
17419 | ||||
17420 | static | |||
17421 | void DelegatingCycleHelper(CXXConstructorDecl* Ctor, | |||
17422 | llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Valid, | |||
17423 | llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Invalid, | |||
17424 | llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Current, | |||
17425 | Sema &S) { | |||
17426 | if (Ctor->isInvalidDecl()) | |||
17427 | return; | |||
17428 | ||||
17429 | CXXConstructorDecl *Target = Ctor->getTargetConstructor(); | |||
17430 | ||||
17431 | // Target may not be determinable yet, for instance if this is a dependent | |||
17432 | // call in an uninstantiated template. | |||
17433 | if (Target) { | |||
17434 | const FunctionDecl *FNTarget = nullptr; | |||
17435 | (void)Target->hasBody(FNTarget); | |||
17436 | Target = const_cast<CXXConstructorDecl*>( | |||
17437 | cast_or_null<CXXConstructorDecl>(FNTarget)); | |||
17438 | } | |||
17439 | ||||
17440 | CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), | |||
17441 | // Avoid dereferencing a null pointer here. | |||
17442 | *TCanonical = Target? Target->getCanonicalDecl() : nullptr; | |||
17443 | ||||
17444 | if (!Current.insert(Canonical).second) | |||
17445 | return; | |||
17446 | ||||
17447 | // We know that beyond here, we aren't chaining into a cycle. | |||
17448 | if (!Target || !Target->isDelegatingConstructor() || | |||
17449 | Target->isInvalidDecl() || Valid.count(TCanonical)) { | |||
17450 | Valid.insert(Current.begin(), Current.end()); | |||
17451 | Current.clear(); | |||
17452 | // We've hit a cycle. | |||
17453 | } else if (TCanonical == Canonical || Invalid.count(TCanonical) || | |||
17454 | Current.count(TCanonical)) { | |||
17455 | // If we haven't diagnosed this cycle yet, do so now. | |||
17456 | if (!Invalid.count(TCanonical)) { | |||
17457 | S.Diag((*Ctor->init_begin())->getSourceLocation(), | |||
17458 | diag::warn_delegating_ctor_cycle) | |||
17459 | << Ctor; | |||
17460 | ||||
17461 | // Don't add a note for a function delegating directly to itself. | |||
17462 | if (TCanonical != Canonical) | |||
17463 | S.Diag(Target->getLocation(), diag::note_it_delegates_to); | |||
17464 | ||||
17465 | CXXConstructorDecl *C = Target; | |||
17466 | while (C->getCanonicalDecl() != Canonical) { | |||
17467 | const FunctionDecl *FNTarget = nullptr; | |||
17468 | (void)C->getTargetConstructor()->hasBody(FNTarget); | |||
17469 | assert(FNTarget && "Ctor cycle through bodiless function")((FNTarget && "Ctor cycle through bodiless function") ? static_cast<void> (0) : __assert_fail ("FNTarget && \"Ctor cycle through bodiless function\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 17469, __PRETTY_FUNCTION__)); | |||
17470 | ||||
17471 | C = const_cast<CXXConstructorDecl*>( | |||
17472 | cast<CXXConstructorDecl>(FNTarget)); | |||
17473 | S.Diag(C->getLocation(), diag::note_which_delegates_to); | |||
17474 | } | |||
17475 | } | |||
17476 | ||||
17477 | Invalid.insert(Current.begin(), Current.end()); | |||
17478 | Current.clear(); | |||
17479 | } else { | |||
17480 | DelegatingCycleHelper(Target, Valid, Invalid, Current, S); | |||
17481 | } | |||
17482 | } | |||
17483 | ||||
17484 | ||||
17485 | void Sema::CheckDelegatingCtorCycles() { | |||
17486 | llvm::SmallPtrSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; | |||
17487 | ||||
17488 | for (DelegatingCtorDeclsType::iterator | |||
17489 | I = DelegatingCtorDecls.begin(ExternalSource), | |||
17490 | E = DelegatingCtorDecls.end(); | |||
17491 | I != E; ++I) | |||
17492 | DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); | |||
17493 | ||||
17494 | for (auto CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) | |||
17495 | (*CI)->setInvalidDecl(); | |||
17496 | } | |||
17497 | ||||
17498 | namespace { | |||
17499 | /// AST visitor that finds references to the 'this' expression. | |||
17500 | class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { | |||
17501 | Sema &S; | |||
17502 | ||||
17503 | public: | |||
17504 | explicit FindCXXThisExpr(Sema &S) : S(S) { } | |||
17505 | ||||
17506 | bool VisitCXXThisExpr(CXXThisExpr *E) { | |||
17507 | S.Diag(E->getLocation(), diag::err_this_static_member_func) | |||
17508 | << E->isImplicit(); | |||
17509 | return false; | |||
17510 | } | |||
17511 | }; | |||
17512 | } | |||
17513 | ||||
17514 | bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { | |||
17515 | TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); | |||
17516 | if (!TSInfo) | |||
17517 | return false; | |||
17518 | ||||
17519 | TypeLoc TL = TSInfo->getTypeLoc(); | |||
17520 | FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); | |||
17521 | if (!ProtoTL) | |||
17522 | return false; | |||
17523 | ||||
17524 | // C++11 [expr.prim.general]p3: | |||
17525 | // [The expression this] shall not appear before the optional | |||
17526 | // cv-qualifier-seq and it shall not appear within the declaration of a | |||
17527 | // static member function (although its type and value category are defined | |||
17528 | // within a static member function as they are within a non-static member | |||
17529 | // function). [ Note: this is because declaration matching does not occur | |||
17530 | // until the complete declarator is known. - end note ] | |||
17531 | const FunctionProtoType *Proto = ProtoTL.getTypePtr(); | |||
17532 | FindCXXThisExpr Finder(*this); | |||
17533 | ||||
17534 | // If the return type came after the cv-qualifier-seq, check it now. | |||
17535 | if (Proto->hasTrailingReturn() && | |||
17536 | !Finder.TraverseTypeLoc(ProtoTL.getReturnLoc())) | |||
17537 | return true; | |||
17538 | ||||
17539 | // Check the exception specification. | |||
17540 | if (checkThisInStaticMemberFunctionExceptionSpec(Method)) | |||
17541 | return true; | |||
17542 | ||||
17543 | // Check the trailing requires clause | |||
17544 | if (Expr *E = Method->getTrailingRequiresClause()) | |||
17545 | if (!Finder.TraverseStmt(E)) | |||
17546 | return true; | |||
17547 | ||||
17548 | return checkThisInStaticMemberFunctionAttributes(Method); | |||
17549 | } | |||
17550 | ||||
17551 | bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { | |||
17552 | TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); | |||
17553 | if (!TSInfo) | |||
17554 | return false; | |||
17555 | ||||
17556 | TypeLoc TL = TSInfo->getTypeLoc(); | |||
17557 | FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); | |||
17558 | if (!ProtoTL) | |||
17559 | return false; | |||
17560 | ||||
17561 | const FunctionProtoType *Proto = ProtoTL.getTypePtr(); | |||
17562 | FindCXXThisExpr Finder(*this); | |||
17563 | ||||
17564 | switch (Proto->getExceptionSpecType()) { | |||
17565 | case EST_Unparsed: | |||
17566 | case EST_Uninstantiated: | |||
17567 | case EST_Unevaluated: | |||
17568 | case EST_BasicNoexcept: | |||
17569 | case EST_NoThrow: | |||
17570 | case EST_DynamicNone: | |||
17571 | case EST_MSAny: | |||
17572 | case EST_None: | |||
17573 | break; | |||
17574 | ||||
17575 | case EST_DependentNoexcept: | |||
17576 | case EST_NoexceptFalse: | |||
17577 | case EST_NoexceptTrue: | |||
17578 | if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) | |||
17579 | return true; | |||
17580 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
17581 | ||||
17582 | case EST_Dynamic: | |||
17583 | for (const auto &E : Proto->exceptions()) { | |||
17584 | if (!Finder.TraverseType(E)) | |||
17585 | return true; | |||
17586 | } | |||
17587 | break; | |||
17588 | } | |||
17589 | ||||
17590 | return false; | |||
17591 | } | |||
17592 | ||||
17593 | bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { | |||
17594 | FindCXXThisExpr Finder(*this); | |||
17595 | ||||
17596 | // Check attributes. | |||
17597 | for (const auto *A : Method->attrs()) { | |||
17598 | // FIXME: This should be emitted by tblgen. | |||
17599 | Expr *Arg = nullptr; | |||
17600 | ArrayRef<Expr *> Args; | |||
17601 | if (const auto *G = dyn_cast<GuardedByAttr>(A)) | |||
17602 | Arg = G->getArg(); | |||
17603 | else if (const auto *G = dyn_cast<PtGuardedByAttr>(A)) | |||
17604 | Arg = G->getArg(); | |||
17605 | else if (const auto *AA = dyn_cast<AcquiredAfterAttr>(A)) | |||
17606 | Args = llvm::makeArrayRef(AA->args_begin(), AA->args_size()); | |||
17607 | else if (const auto *AB = dyn_cast<AcquiredBeforeAttr>(A)) | |||
17608 | Args = llvm::makeArrayRef(AB->args_begin(), AB->args_size()); | |||
17609 | else if (const auto *ETLF = dyn_cast<ExclusiveTrylockFunctionAttr>(A)) { | |||
17610 | Arg = ETLF->getSuccessValue(); | |||
17611 | Args = llvm::makeArrayRef(ETLF->args_begin(), ETLF->args_size()); | |||
17612 | } else if (const auto *STLF = dyn_cast<SharedTrylockFunctionAttr>(A)) { | |||
17613 | Arg = STLF->getSuccessValue(); | |||
17614 | Args = llvm::makeArrayRef(STLF->args_begin(), STLF->args_size()); | |||
17615 | } else if (const auto *LR = dyn_cast<LockReturnedAttr>(A)) | |||
17616 | Arg = LR->getArg(); | |||
17617 | else if (const auto *LE = dyn_cast<LocksExcludedAttr>(A)) | |||
17618 | Args = llvm::makeArrayRef(LE->args_begin(), LE->args_size()); | |||
17619 | else if (const auto *RC = dyn_cast<RequiresCapabilityAttr>(A)) | |||
17620 | Args = llvm::makeArrayRef(RC->args_begin(), RC->args_size()); | |||
17621 | else if (const auto *AC = dyn_cast<AcquireCapabilityAttr>(A)) | |||
17622 | Args = llvm::makeArrayRef(AC->args_begin(), AC->args_size()); | |||
17623 | else if (const auto *AC = dyn_cast<TryAcquireCapabilityAttr>(A)) | |||
17624 | Args = llvm::makeArrayRef(AC->args_begin(), AC->args_size()); | |||
17625 | else if (const auto *RC = dyn_cast<ReleaseCapabilityAttr>(A)) | |||
17626 | Args = llvm::makeArrayRef(RC->args_begin(), RC->args_size()); | |||
17627 | ||||
17628 | if (Arg && !Finder.TraverseStmt(Arg)) | |||
17629 | return true; | |||
17630 | ||||
17631 | for (unsigned I = 0, N = Args.size(); I != N; ++I) { | |||
17632 | if (!Finder.TraverseStmt(Args[I])) | |||
17633 | return true; | |||
17634 | } | |||
17635 | } | |||
17636 | ||||
17637 | return false; | |||
17638 | } | |||
17639 | ||||
17640 | void Sema::checkExceptionSpecification( | |||
17641 | bool IsTopLevel, ExceptionSpecificationType EST, | |||
17642 | ArrayRef<ParsedType> DynamicExceptions, | |||
17643 | ArrayRef<SourceRange> DynamicExceptionRanges, Expr *NoexceptExpr, | |||
17644 | SmallVectorImpl<QualType> &Exceptions, | |||
17645 | FunctionProtoType::ExceptionSpecInfo &ESI) { | |||
17646 | Exceptions.clear(); | |||
17647 | ESI.Type = EST; | |||
17648 | if (EST == EST_Dynamic) { | |||
17649 | Exceptions.reserve(DynamicExceptions.size()); | |||
17650 | for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { | |||
17651 | // FIXME: Preserve type source info. | |||
17652 | QualType ET = GetTypeFromParser(DynamicExceptions[ei]); | |||
17653 | ||||
17654 | if (IsTopLevel) { | |||
17655 | SmallVector<UnexpandedParameterPack, 2> Unexpanded; | |||
17656 | collectUnexpandedParameterPacks(ET, Unexpanded); | |||
17657 | if (!Unexpanded.empty()) { | |||
17658 | DiagnoseUnexpandedParameterPacks( | |||
17659 | DynamicExceptionRanges[ei].getBegin(), UPPC_ExceptionType, | |||
17660 | Unexpanded); | |||
17661 | continue; | |||
17662 | } | |||
17663 | } | |||
17664 | ||||
17665 | // Check that the type is valid for an exception spec, and | |||
17666 | // drop it if not. | |||
17667 | if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) | |||
17668 | Exceptions.push_back(ET); | |||
17669 | } | |||
17670 | ESI.Exceptions = Exceptions; | |||
17671 | return; | |||
17672 | } | |||
17673 | ||||
17674 | if (isComputedNoexcept(EST)) { | |||
17675 | assert((NoexceptExpr->isTypeDependent() ||(((NoexceptExpr->isTypeDependent() || NoexceptExpr->getType ()->getCanonicalTypeUnqualified() == Context.BoolTy) && "Parser should have made sure that the expression is boolean" ) ? static_cast<void> (0) : __assert_fail ("(NoexceptExpr->isTypeDependent() || NoexceptExpr->getType()->getCanonicalTypeUnqualified() == Context.BoolTy) && \"Parser should have made sure that the expression is boolean\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 17678, __PRETTY_FUNCTION__)) | |||
17676 | NoexceptExpr->getType()->getCanonicalTypeUnqualified() ==(((NoexceptExpr->isTypeDependent() || NoexceptExpr->getType ()->getCanonicalTypeUnqualified() == Context.BoolTy) && "Parser should have made sure that the expression is boolean" ) ? static_cast<void> (0) : __assert_fail ("(NoexceptExpr->isTypeDependent() || NoexceptExpr->getType()->getCanonicalTypeUnqualified() == Context.BoolTy) && \"Parser should have made sure that the expression is boolean\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 17678, __PRETTY_FUNCTION__)) | |||
17677 | Context.BoolTy) &&(((NoexceptExpr->isTypeDependent() || NoexceptExpr->getType ()->getCanonicalTypeUnqualified() == Context.BoolTy) && "Parser should have made sure that the expression is boolean" ) ? static_cast<void> (0) : __assert_fail ("(NoexceptExpr->isTypeDependent() || NoexceptExpr->getType()->getCanonicalTypeUnqualified() == Context.BoolTy) && \"Parser should have made sure that the expression is boolean\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 17678, __PRETTY_FUNCTION__)) | |||
17678 | "Parser should have made sure that the expression is boolean")(((NoexceptExpr->isTypeDependent() || NoexceptExpr->getType ()->getCanonicalTypeUnqualified() == Context.BoolTy) && "Parser should have made sure that the expression is boolean" ) ? static_cast<void> (0) : __assert_fail ("(NoexceptExpr->isTypeDependent() || NoexceptExpr->getType()->getCanonicalTypeUnqualified() == Context.BoolTy) && \"Parser should have made sure that the expression is boolean\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/lib/Sema/SemaDeclCXX.cpp" , 17678, __PRETTY_FUNCTION__)); | |||
17679 | if (IsTopLevel && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { | |||
17680 | ESI.Type = EST_BasicNoexcept; | |||
17681 | return; | |||
17682 | } | |||
17683 | ||||
17684 | ESI.NoexceptExpr = NoexceptExpr; | |||
17685 | return; | |||
17686 | } | |||
17687 | } | |||
17688 | ||||
17689 | void Sema::actOnDelayedExceptionSpecification(Decl *MethodD, | |||
17690 | ExceptionSpecificationType EST, | |||
17691 | SourceRange SpecificationRange, | |||
17692 | ArrayRef<ParsedType> DynamicExceptions, | |||
17693 | ArrayRef<SourceRange> DynamicExceptionRanges, | |||
17694 | Expr *NoexceptExpr) { | |||
17695 | if (!MethodD) | |||
17696 | return; | |||
17697 | ||||
17698 | // Dig out the method we're referring to. | |||
17699 | if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(MethodD)) | |||
17700 | MethodD = FunTmpl->getTemplatedDecl(); | |||
17701 | ||||
17702 | CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(MethodD); | |||
17703 | if (!Method) | |||
17704 | return; | |||
17705 | ||||
17706 | // Check the exception specification. | |||
17707 | llvm::SmallVector<QualType, 4> Exceptions; | |||
17708 | FunctionProtoType::ExceptionSpecInfo ESI; | |||
17709 | checkExceptionSpecification(/*IsTopLevel*/true, EST, DynamicExceptions, | |||
17710 | DynamicExceptionRanges, NoexceptExpr, Exceptions, | |||
17711 | ESI); | |||
17712 | ||||
17713 | // Update the exception specification on the function type. | |||
17714 | Context.adjustExceptionSpec(Method, ESI, /*AsWritten*/true); | |||
17715 | ||||
17716 | if (Method->isStatic()) | |||
17717 | checkThisInStaticMemberFunctionExceptionSpec(Method); | |||
17718 | ||||
17719 | if (Method->isVirtual()) { | |||
17720 | // Check overrides, which we previously had to delay. | |||
17721 | for (const CXXMethodDecl *O : Method->overridden_methods()) | |||
17722 | CheckOverridingFunctionExceptionSpec(Method, O); | |||
17723 | } | |||
17724 | } | |||
17725 | ||||
17726 | /// HandleMSProperty - Analyze a __delcspec(property) field of a C++ class. | |||
17727 | /// | |||
17728 | MSPropertyDecl *Sema::HandleMSProperty(Scope *S, RecordDecl *Record, | |||
17729 | SourceLocation DeclStart, Declarator &D, | |||
17730 | Expr *BitWidth, | |||
17731 | InClassInitStyle InitStyle, | |||
17732 | AccessSpecifier AS, | |||
17733 | const ParsedAttr &MSPropertyAttr) { | |||
17734 | IdentifierInfo *II = D.getIdentifier(); | |||
17735 | if (!II) { | |||
17736 | Diag(DeclStart, diag::err_anonymous_property); | |||
17737 | return nullptr; | |||
17738 | } | |||
17739 | SourceLocation Loc = D.getIdentifierLoc(); | |||
17740 | ||||
17741 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); | |||
17742 | QualType T = TInfo->getType(); | |||
17743 | if (getLangOpts().CPlusPlus) { | |||
17744 | CheckExtraCXXDefaultArguments(D); | |||
17745 | ||||
17746 | if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, | |||
17747 | UPPC_DataMemberType)) { | |||
17748 | D.setInvalidType(); | |||
17749 | T = Context.IntTy; | |||
17750 | TInfo = Context.getTrivialTypeSourceInfo(T, Loc); | |||
17751 | } | |||
17752 | } | |||
17753 | ||||
17754 | DiagnoseFunctionSpecifiers(D.getDeclSpec()); | |||
17755 | ||||
17756 | if (D.getDeclSpec().isInlineSpecified()) | |||
17757 | Diag(D.getDeclSpec().getInlineSpecLoc(), diag::err_inline_non_function) | |||
17758 | << getLangOpts().CPlusPlus17; | |||
17759 | if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec()) | |||
17760 | Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(), | |||
17761 | diag::err_invalid_thread) | |||
17762 | << DeclSpec::getSpecifierName(TSCS); | |||
17763 | ||||
17764 | // Check to see if this name was declared as a member previously | |||
17765 | NamedDecl *PrevDecl = nullptr; | |||
17766 | LookupResult Previous(*this, II, Loc, LookupMemberName, | |||
17767 | ForVisibleRedeclaration); | |||
17768 | LookupName(Previous, S); | |||
17769 | switch (Previous.getResultKind()) { | |||
17770 | case LookupResult::Found: | |||
17771 | case LookupResult::FoundUnresolvedValue: | |||
17772 | PrevDecl = Previous.getAsSingle<NamedDecl>(); | |||
17773 | break; | |||
17774 | ||||
17775 | case LookupResult::FoundOverloaded: | |||
17776 | PrevDecl = Previous.getRepresentativeDecl(); | |||
17777 | break; | |||
17778 | ||||
17779 | case LookupResult::NotFound: | |||
17780 | case LookupResult::NotFoundInCurrentInstantiation: | |||
17781 | case LookupResult::Ambiguous: | |||
17782 | break; | |||
17783 | } | |||
17784 | ||||
17785 | if (PrevDecl && PrevDecl->isTemplateParameter()) { | |||
17786 | // Maybe we will complain about the shadowed template parameter. | |||
17787 | DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); | |||
17788 | // Just pretend that we didn't see the previous declaration. | |||
17789 | PrevDecl = nullptr; | |||
17790 | } | |||
17791 | ||||
17792 | if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) | |||
17793 | PrevDecl = nullptr; | |||
17794 | ||||
17795 | SourceLocation TSSL = D.getBeginLoc(); | |||
17796 | MSPropertyDecl *NewPD = | |||
17797 | MSPropertyDecl::Create(Context, Record, Loc, II, T, TInfo, TSSL, | |||
17798 | MSPropertyAttr.getPropertyDataGetter(), | |||
17799 | MSPropertyAttr.getPropertyDataSetter()); | |||
17800 | ProcessDeclAttributes(TUScope, NewPD, D); | |||
17801 | NewPD->setAccess(AS); | |||
17802 | ||||
17803 | if (NewPD->isInvalidDecl()) | |||
17804 | Record->setInvalidDecl(); | |||
17805 | ||||
17806 | if (D.getDeclSpec().isModulePrivateSpecified()) | |||
17807 | NewPD->setModulePrivate(); | |||
17808 | ||||
17809 | if (NewPD->isInvalidDecl() && PrevDecl) { | |||
17810 | // Don't introduce NewFD into scope; there's already something | |||
17811 | // with the same name in the same scope. | |||
17812 | } else if (II) { | |||
17813 | PushOnScopeChains(NewPD, S); | |||
17814 | } else | |||
17815 | Record->addDecl(NewPD); | |||
17816 | ||||
17817 | return NewPD; | |||
17818 | } | |||
17819 | ||||
17820 | void Sema::ActOnStartFunctionDeclarationDeclarator( | |||
17821 | Declarator &Declarator, unsigned TemplateParameterDepth) { | |||
17822 | auto &Info = InventedParameterInfos.emplace_back(); | |||
17823 | TemplateParameterList *ExplicitParams = nullptr; | |||
17824 | ArrayRef<TemplateParameterList *> ExplicitLists = | |||
17825 | Declarator.getTemplateParameterLists(); | |||
17826 | if (!ExplicitLists.empty()) { | |||
17827 | bool IsMemberSpecialization, IsInvalid; | |||
17828 | ExplicitParams = MatchTemplateParametersToScopeSpecifier( | |||
17829 | Declarator.getBeginLoc(), Declarator.getIdentifierLoc(), | |||
17830 | Declarator.getCXXScopeSpec(), /*TemplateId=*/nullptr, | |||
17831 | ExplicitLists, /*IsFriend=*/false, IsMemberSpecialization, IsInvalid, | |||
17832 | /*SuppressDiagnostic=*/true); | |||
17833 | } | |||
17834 | if (ExplicitParams) { | |||
17835 | Info.AutoTemplateParameterDepth = ExplicitParams->getDepth(); | |||
17836 | for (NamedDecl *Param : *ExplicitParams) | |||
17837 | Info.TemplateParams.push_back(Param); | |||
17838 | Info.NumExplicitTemplateParams = ExplicitParams->size(); | |||
17839 | } else { | |||
17840 | Info.AutoTemplateParameterDepth = TemplateParameterDepth; | |||
17841 | Info.NumExplicitTemplateParams = 0; | |||
17842 | } | |||
17843 | } | |||
17844 | ||||
17845 | void Sema::ActOnFinishFunctionDeclarationDeclarator(Declarator &Declarator) { | |||
17846 | auto &FSI = InventedParameterInfos.back(); | |||
17847 | if (FSI.TemplateParams.size() > FSI.NumExplicitTemplateParams) { | |||
17848 | if (FSI.NumExplicitTemplateParams != 0) { | |||
17849 | TemplateParameterList *ExplicitParams = | |||
17850 | Declarator.getTemplateParameterLists().back(); | |||
17851 | Declarator.setInventedTemplateParameterList( | |||
17852 | TemplateParameterList::Create( | |||
17853 | Context, ExplicitParams->getTemplateLoc(), | |||
17854 | ExplicitParams->getLAngleLoc(), FSI.TemplateParams, | |||
17855 | ExplicitParams->getRAngleLoc(), | |||
17856 | ExplicitParams->getRequiresClause())); | |||
17857 | } else { | |||
17858 | Declarator.setInventedTemplateParameterList( | |||
17859 | TemplateParameterList::Create( | |||
17860 | Context, SourceLocation(), SourceLocation(), FSI.TemplateParams, | |||
17861 | SourceLocation(), /*RequiresClause=*/nullptr)); | |||
17862 | } | |||
17863 | } | |||
17864 | InventedParameterInfos.pop_back(); | |||
17865 | } |
1 | //===- Decl.h - Classes for representing declarations -----------*- C++ -*-===// |
2 | // |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | // |
7 | //===----------------------------------------------------------------------===// |
8 | // |
9 | // This file defines the Decl subclasses. |
10 | // |
11 | //===----------------------------------------------------------------------===// |
12 | |
13 | #ifndef LLVM_CLANG_AST_DECL_H |
14 | #define LLVM_CLANG_AST_DECL_H |
15 | |
16 | #include "clang/AST/APValue.h" |
17 | #include "clang/AST/ASTContextAllocate.h" |
18 | #include "clang/AST/DeclAccessPair.h" |
19 | #include "clang/AST/DeclBase.h" |
20 | #include "clang/AST/DeclarationName.h" |
21 | #include "clang/AST/ExternalASTSource.h" |
22 | #include "clang/AST/NestedNameSpecifier.h" |
23 | #include "clang/AST/Redeclarable.h" |
24 | #include "clang/AST/Type.h" |
25 | #include "clang/Basic/AddressSpaces.h" |
26 | #include "clang/Basic/Diagnostic.h" |
27 | #include "clang/Basic/IdentifierTable.h" |
28 | #include "clang/Basic/LLVM.h" |
29 | #include "clang/Basic/Linkage.h" |
30 | #include "clang/Basic/OperatorKinds.h" |
31 | #include "clang/Basic/PartialDiagnostic.h" |
32 | #include "clang/Basic/PragmaKinds.h" |
33 | #include "clang/Basic/SourceLocation.h" |
34 | #include "clang/Basic/Specifiers.h" |
35 | #include "clang/Basic/Visibility.h" |
36 | #include "llvm/ADT/APSInt.h" |
37 | #include "llvm/ADT/ArrayRef.h" |
38 | #include "llvm/ADT/Optional.h" |
39 | #include "llvm/ADT/PointerIntPair.h" |
40 | #include "llvm/ADT/PointerUnion.h" |
41 | #include "llvm/ADT/StringRef.h" |
42 | #include "llvm/ADT/iterator_range.h" |
43 | #include "llvm/Support/Casting.h" |
44 | #include "llvm/Support/Compiler.h" |
45 | #include "llvm/Support/TrailingObjects.h" |
46 | #include <cassert> |
47 | #include <cstddef> |
48 | #include <cstdint> |
49 | #include <string> |
50 | #include <utility> |
51 | |
52 | namespace clang { |
53 | |
54 | class ASTContext; |
55 | struct ASTTemplateArgumentListInfo; |
56 | class Attr; |
57 | class CompoundStmt; |
58 | class DependentFunctionTemplateSpecializationInfo; |
59 | class EnumDecl; |
60 | class Expr; |
61 | class FunctionTemplateDecl; |
62 | class FunctionTemplateSpecializationInfo; |
63 | class FunctionTypeLoc; |
64 | class LabelStmt; |
65 | class MemberSpecializationInfo; |
66 | class Module; |
67 | class NamespaceDecl; |
68 | class ParmVarDecl; |
69 | class RecordDecl; |
70 | class Stmt; |
71 | class StringLiteral; |
72 | class TagDecl; |
73 | class TemplateArgumentList; |
74 | class TemplateArgumentListInfo; |
75 | class TemplateParameterList; |
76 | class TypeAliasTemplateDecl; |
77 | class TypeLoc; |
78 | class UnresolvedSetImpl; |
79 | class VarTemplateDecl; |
80 | |
81 | /// The top declaration context. |
82 | class TranslationUnitDecl : public Decl, public DeclContext { |
83 | ASTContext &Ctx; |
84 | |
85 | /// The (most recently entered) anonymous namespace for this |
86 | /// translation unit, if one has been created. |
87 | NamespaceDecl *AnonymousNamespace = nullptr; |
88 | |
89 | explicit TranslationUnitDecl(ASTContext &ctx); |
90 | |
91 | virtual void anchor(); |
92 | |
93 | public: |
94 | ASTContext &getASTContext() const { return Ctx; } |
95 | |
96 | NamespaceDecl *getAnonymousNamespace() const { return AnonymousNamespace; } |
97 | void setAnonymousNamespace(NamespaceDecl *D) { AnonymousNamespace = D; } |
98 | |
99 | static TranslationUnitDecl *Create(ASTContext &C); |
100 | |
101 | // Implement isa/cast/dyncast/etc. |
102 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
103 | static bool classofKind(Kind K) { return K == TranslationUnit; } |
104 | static DeclContext *castToDeclContext(const TranslationUnitDecl *D) { |
105 | return static_cast<DeclContext *>(const_cast<TranslationUnitDecl*>(D)); |
106 | } |
107 | static TranslationUnitDecl *castFromDeclContext(const DeclContext *DC) { |
108 | return static_cast<TranslationUnitDecl *>(const_cast<DeclContext*>(DC)); |
109 | } |
110 | }; |
111 | |
112 | /// Represents a `#pragma comment` line. Always a child of |
113 | /// TranslationUnitDecl. |
114 | class PragmaCommentDecl final |
115 | : public Decl, |
116 | private llvm::TrailingObjects<PragmaCommentDecl, char> { |
117 | friend class ASTDeclReader; |
118 | friend class ASTDeclWriter; |
119 | friend TrailingObjects; |
120 | |
121 | PragmaMSCommentKind CommentKind; |
122 | |
123 | PragmaCommentDecl(TranslationUnitDecl *TU, SourceLocation CommentLoc, |
124 | PragmaMSCommentKind CommentKind) |
125 | : Decl(PragmaComment, TU, CommentLoc), CommentKind(CommentKind) {} |
126 | |
127 | virtual void anchor(); |
128 | |
129 | public: |
130 | static PragmaCommentDecl *Create(const ASTContext &C, TranslationUnitDecl *DC, |
131 | SourceLocation CommentLoc, |
132 | PragmaMSCommentKind CommentKind, |
133 | StringRef Arg); |
134 | static PragmaCommentDecl *CreateDeserialized(ASTContext &C, unsigned ID, |
135 | unsigned ArgSize); |
136 | |
137 | PragmaMSCommentKind getCommentKind() const { return CommentKind; } |
138 | |
139 | StringRef getArg() const { return getTrailingObjects<char>(); } |
140 | |
141 | // Implement isa/cast/dyncast/etc. |
142 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
143 | static bool classofKind(Kind K) { return K == PragmaComment; } |
144 | }; |
145 | |
146 | /// Represents a `#pragma detect_mismatch` line. Always a child of |
147 | /// TranslationUnitDecl. |
148 | class PragmaDetectMismatchDecl final |
149 | : public Decl, |
150 | private llvm::TrailingObjects<PragmaDetectMismatchDecl, char> { |
151 | friend class ASTDeclReader; |
152 | friend class ASTDeclWriter; |
153 | friend TrailingObjects; |
154 | |
155 | size_t ValueStart; |
156 | |
157 | PragmaDetectMismatchDecl(TranslationUnitDecl *TU, SourceLocation Loc, |
158 | size_t ValueStart) |
159 | : Decl(PragmaDetectMismatch, TU, Loc), ValueStart(ValueStart) {} |
160 | |
161 | virtual void anchor(); |
162 | |
163 | public: |
164 | static PragmaDetectMismatchDecl *Create(const ASTContext &C, |
165 | TranslationUnitDecl *DC, |
166 | SourceLocation Loc, StringRef Name, |
167 | StringRef Value); |
168 | static PragmaDetectMismatchDecl * |
169 | CreateDeserialized(ASTContext &C, unsigned ID, unsigned NameValueSize); |
170 | |
171 | StringRef getName() const { return getTrailingObjects<char>(); } |
172 | StringRef getValue() const { return getTrailingObjects<char>() + ValueStart; } |
173 | |
174 | // Implement isa/cast/dyncast/etc. |
175 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
176 | static bool classofKind(Kind K) { return K == PragmaDetectMismatch; } |
177 | }; |
178 | |
179 | /// Declaration context for names declared as extern "C" in C++. This |
180 | /// is neither the semantic nor lexical context for such declarations, but is |
181 | /// used to check for conflicts with other extern "C" declarations. Example: |
182 | /// |
183 | /// \code |
184 | /// namespace N { extern "C" void f(); } // #1 |
185 | /// void N::f() {} // #2 |
186 | /// namespace M { extern "C" void f(); } // #3 |
187 | /// \endcode |
188 | /// |
189 | /// The semantic context of #1 is namespace N and its lexical context is the |
190 | /// LinkageSpecDecl; the semantic context of #2 is namespace N and its lexical |
191 | /// context is the TU. However, both declarations are also visible in the |
192 | /// extern "C" context. |
193 | /// |
194 | /// The declaration at #3 finds it is a redeclaration of \c N::f through |
195 | /// lookup in the extern "C" context. |
196 | class ExternCContextDecl : public Decl, public DeclContext { |
197 | explicit ExternCContextDecl(TranslationUnitDecl *TU) |
198 | : Decl(ExternCContext, TU, SourceLocation()), |
199 | DeclContext(ExternCContext) {} |
200 | |
201 | virtual void anchor(); |
202 | |
203 | public: |
204 | static ExternCContextDecl *Create(const ASTContext &C, |
205 | TranslationUnitDecl *TU); |
206 | |
207 | // Implement isa/cast/dyncast/etc. |
208 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
209 | static bool classofKind(Kind K) { return K == ExternCContext; } |
210 | static DeclContext *castToDeclContext(const ExternCContextDecl *D) { |
211 | return static_cast<DeclContext *>(const_cast<ExternCContextDecl*>(D)); |
212 | } |
213 | static ExternCContextDecl *castFromDeclContext(const DeclContext *DC) { |
214 | return static_cast<ExternCContextDecl *>(const_cast<DeclContext*>(DC)); |
215 | } |
216 | }; |
217 | |
218 | /// This represents a decl that may have a name. Many decls have names such |
219 | /// as ObjCMethodDecl, but not \@class, etc. |
220 | /// |
221 | /// Note that not every NamedDecl is actually named (e.g., a struct might |
222 | /// be anonymous), and not every name is an identifier. |
223 | class NamedDecl : public Decl { |
224 | /// The name of this declaration, which is typically a normal |
225 | /// identifier but may also be a special kind of name (C++ |
226 | /// constructor, Objective-C selector, etc.) |
227 | DeclarationName Name; |
228 | |
229 | virtual void anchor(); |
230 | |
231 | private: |
232 | NamedDecl *getUnderlyingDeclImpl() LLVM_READONLY__attribute__((__pure__)); |
233 | |
234 | protected: |
235 | NamedDecl(Kind DK, DeclContext *DC, SourceLocation L, DeclarationName N) |
236 | : Decl(DK, DC, L), Name(N) {} |
237 | |
238 | public: |
239 | /// Get the identifier that names this declaration, if there is one. |
240 | /// |
241 | /// This will return NULL if this declaration has no name (e.g., for |
242 | /// an unnamed class) or if the name is a special name (C++ constructor, |
243 | /// Objective-C selector, etc.). |
244 | IdentifierInfo *getIdentifier() const { return Name.getAsIdentifierInfo(); } |
245 | |
246 | /// Get the name of identifier for this declaration as a StringRef. |
247 | /// |
248 | /// This requires that the declaration have a name and that it be a simple |
249 | /// identifier. |
250 | StringRef getName() const { |
251 | assert(Name.isIdentifier() && "Name is not a simple identifier")((Name.isIdentifier() && "Name is not a simple identifier" ) ? static_cast<void> (0) : __assert_fail ("Name.isIdentifier() && \"Name is not a simple identifier\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 251, __PRETTY_FUNCTION__)); |
252 | return getIdentifier() ? getIdentifier()->getName() : ""; |
253 | } |
254 | |
255 | /// Get a human-readable name for the declaration, even if it is one of the |
256 | /// special kinds of names (C++ constructor, Objective-C selector, etc). |
257 | /// |
258 | /// Creating this name requires expensive string manipulation, so it should |
259 | /// be called only when performance doesn't matter. For simple declarations, |
260 | /// getNameAsCString() should suffice. |
261 | // |
262 | // FIXME: This function should be renamed to indicate that it is not just an |
263 | // alternate form of getName(), and clients should move as appropriate. |
264 | // |
265 | // FIXME: Deprecated, move clients to getName(). |
266 | std::string getNameAsString() const { return Name.getAsString(); } |
267 | |
268 | /// Pretty-print the unqualified name of this declaration. Can be overloaded |
269 | /// by derived classes to provide a more user-friendly name when appropriate. |
270 | virtual void printName(raw_ostream &os) const; |
271 | |
272 | /// Get the actual, stored name of the declaration, which may be a special |
273 | /// name. |
274 | /// |
275 | /// Note that generally in diagnostics, the non-null \p NamedDecl* itself |
276 | /// should be sent into the diagnostic instead of using the result of |
277 | /// \p getDeclName(). |
278 | /// |
279 | /// A \p DeclarationName in a diagnostic will just be streamed to the output, |
280 | /// which will directly result in a call to \p DeclarationName::print. |
281 | /// |
282 | /// A \p NamedDecl* in a diagnostic will also ultimately result in a call to |
283 | /// \p DeclarationName::print, but with two customisation points along the |
284 | /// way (\p getNameForDiagnostic and \p printName). These are used to print |
285 | /// the template arguments if any, and to provide a user-friendly name for |
286 | /// some entities (such as unnamed variables and anonymous records). |
287 | DeclarationName getDeclName() const { return Name; } |
288 | |
289 | /// Set the name of this declaration. |
290 | void setDeclName(DeclarationName N) { Name = N; } |
291 | |
292 | /// Returns a human-readable qualified name for this declaration, like |
293 | /// A::B::i, for i being member of namespace A::B. |
294 | /// |
295 | /// If the declaration is not a member of context which can be named (record, |
296 | /// namespace), it will return the same result as printName(). |
297 | /// |
298 | /// Creating this name is expensive, so it should be called only when |
299 | /// performance doesn't matter. |
300 | void printQualifiedName(raw_ostream &OS) const; |
301 | void printQualifiedName(raw_ostream &OS, const PrintingPolicy &Policy) const; |
302 | |
303 | /// Print only the nested name specifier part of a fully-qualified name, |
304 | /// including the '::' at the end. E.g. |
305 | /// when `printQualifiedName(D)` prints "A::B::i", |
306 | /// this function prints "A::B::". |
307 | void printNestedNameSpecifier(raw_ostream &OS) const; |
308 | void printNestedNameSpecifier(raw_ostream &OS, |
309 | const PrintingPolicy &Policy) const; |
310 | |
311 | // FIXME: Remove string version. |
312 | std::string getQualifiedNameAsString() const; |
313 | |
314 | /// Appends a human-readable name for this declaration into the given stream. |
315 | /// |
316 | /// This is the method invoked by Sema when displaying a NamedDecl |
317 | /// in a diagnostic. It does not necessarily produce the same |
318 | /// result as printName(); for example, class template |
319 | /// specializations are printed with their template arguments. |
320 | virtual void getNameForDiagnostic(raw_ostream &OS, |
321 | const PrintingPolicy &Policy, |
322 | bool Qualified) const; |
323 | |
324 | /// Determine whether this declaration, if known to be well-formed within |
325 | /// its context, will replace the declaration OldD if introduced into scope. |
326 | /// |
327 | /// A declaration will replace another declaration if, for example, it is |
328 | /// a redeclaration of the same variable or function, but not if it is a |
329 | /// declaration of a different kind (function vs. class) or an overloaded |
330 | /// function. |
331 | /// |
332 | /// \param IsKnownNewer \c true if this declaration is known to be newer |
333 | /// than \p OldD (for instance, if this declaration is newly-created). |
334 | bool declarationReplaces(NamedDecl *OldD, bool IsKnownNewer = true) const; |
335 | |
336 | /// Determine whether this declaration has linkage. |
337 | bool hasLinkage() const; |
338 | |
339 | using Decl::isModulePrivate; |
340 | using Decl::setModulePrivate; |
341 | |
342 | /// Determine whether this declaration is a C++ class member. |
343 | bool isCXXClassMember() const { |
344 | const DeclContext *DC = getDeclContext(); |
345 | |
346 | // C++0x [class.mem]p1: |
347 | // The enumerators of an unscoped enumeration defined in |
348 | // the class are members of the class. |
349 | if (isa<EnumDecl>(DC)) |
350 | DC = DC->getRedeclContext(); |
351 | |
352 | return DC->isRecord(); |
353 | } |
354 | |
355 | /// Determine whether the given declaration is an instance member of |
356 | /// a C++ class. |
357 | bool isCXXInstanceMember() const; |
358 | |
359 | /// Determine what kind of linkage this entity has. |
360 | /// |
361 | /// This is not the linkage as defined by the standard or the codegen notion |
362 | /// of linkage. It is just an implementation detail that is used to compute |
363 | /// those. |
364 | Linkage getLinkageInternal() const; |
365 | |
366 | /// Get the linkage from a semantic point of view. Entities in |
367 | /// anonymous namespaces are external (in c++98). |
368 | Linkage getFormalLinkage() const { |
369 | return clang::getFormalLinkage(getLinkageInternal()); |
370 | } |
371 | |
372 | /// True if this decl has external linkage. |
373 | bool hasExternalFormalLinkage() const { |
374 | return isExternalFormalLinkage(getLinkageInternal()); |
375 | } |
376 | |
377 | bool isExternallyVisible() const { |
378 | return clang::isExternallyVisible(getLinkageInternal()); |
379 | } |
380 | |
381 | /// Determine whether this declaration can be redeclared in a |
382 | /// different translation unit. |
383 | bool isExternallyDeclarable() const { |
384 | return isExternallyVisible() && !getOwningModuleForLinkage(); |
385 | } |
386 | |
387 | /// Determines the visibility of this entity. |
388 | Visibility getVisibility() const { |
389 | return getLinkageAndVisibility().getVisibility(); |
390 | } |
391 | |
392 | /// Determines the linkage and visibility of this entity. |
393 | LinkageInfo getLinkageAndVisibility() const; |
394 | |
395 | /// Kinds of explicit visibility. |
396 | enum ExplicitVisibilityKind { |
397 | /// Do an LV computation for, ultimately, a type. |
398 | /// Visibility may be restricted by type visibility settings and |
399 | /// the visibility of template arguments. |
400 | VisibilityForType, |
401 | |
402 | /// Do an LV computation for, ultimately, a non-type declaration. |
403 | /// Visibility may be restricted by value visibility settings and |
404 | /// the visibility of template arguments. |
405 | VisibilityForValue |
406 | }; |
407 | |
408 | /// If visibility was explicitly specified for this |
409 | /// declaration, return that visibility. |
410 | Optional<Visibility> |
411 | getExplicitVisibility(ExplicitVisibilityKind kind) const; |
412 | |
413 | /// True if the computed linkage is valid. Used for consistency |
414 | /// checking. Should always return true. |
415 | bool isLinkageValid() const; |
416 | |
417 | /// True if something has required us to compute the linkage |
418 | /// of this declaration. |
419 | /// |
420 | /// Language features which can retroactively change linkage (like a |
421 | /// typedef name for linkage purposes) may need to consider this, |
422 | /// but hopefully only in transitory ways during parsing. |
423 | bool hasLinkageBeenComputed() const { |
424 | return hasCachedLinkage(); |
425 | } |
426 | |
427 | /// Looks through UsingDecls and ObjCCompatibleAliasDecls for |
428 | /// the underlying named decl. |
429 | NamedDecl *getUnderlyingDecl() { |
430 | // Fast-path the common case. |
431 | if (this->getKind() != UsingShadow && |
432 | this->getKind() != ConstructorUsingShadow && |
433 | this->getKind() != ObjCCompatibleAlias && |
434 | this->getKind() != NamespaceAlias) |
435 | return this; |
436 | |
437 | return getUnderlyingDeclImpl(); |
438 | } |
439 | const NamedDecl *getUnderlyingDecl() const { |
440 | return const_cast<NamedDecl*>(this)->getUnderlyingDecl(); |
441 | } |
442 | |
443 | NamedDecl *getMostRecentDecl() { |
444 | return cast<NamedDecl>(static_cast<Decl *>(this)->getMostRecentDecl()); |
445 | } |
446 | const NamedDecl *getMostRecentDecl() const { |
447 | return const_cast<NamedDecl*>(this)->getMostRecentDecl(); |
448 | } |
449 | |
450 | ObjCStringFormatFamily getObjCFStringFormattingFamily() const; |
451 | |
452 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
453 | static bool classofKind(Kind K) { return K >= firstNamed && K <= lastNamed; } |
454 | }; |
455 | |
456 | inline raw_ostream &operator<<(raw_ostream &OS, const NamedDecl &ND) { |
457 | ND.printName(OS); |
458 | return OS; |
459 | } |
460 | |
461 | /// Represents the declaration of a label. Labels also have a |
462 | /// corresponding LabelStmt, which indicates the position that the label was |
463 | /// defined at. For normal labels, the location of the decl is the same as the |
464 | /// location of the statement. For GNU local labels (__label__), the decl |
465 | /// location is where the __label__ is. |
466 | class LabelDecl : public NamedDecl { |
467 | LabelStmt *TheStmt; |
468 | StringRef MSAsmName; |
469 | bool MSAsmNameResolved = false; |
470 | |
471 | /// For normal labels, this is the same as the main declaration |
472 | /// label, i.e., the location of the identifier; for GNU local labels, |
473 | /// this is the location of the __label__ keyword. |
474 | SourceLocation LocStart; |
475 | |
476 | LabelDecl(DeclContext *DC, SourceLocation IdentL, IdentifierInfo *II, |
477 | LabelStmt *S, SourceLocation StartL) |
478 | : NamedDecl(Label, DC, IdentL, II), TheStmt(S), LocStart(StartL) {} |
479 | |
480 | void anchor() override; |
481 | |
482 | public: |
483 | static LabelDecl *Create(ASTContext &C, DeclContext *DC, |
484 | SourceLocation IdentL, IdentifierInfo *II); |
485 | static LabelDecl *Create(ASTContext &C, DeclContext *DC, |
486 | SourceLocation IdentL, IdentifierInfo *II, |
487 | SourceLocation GnuLabelL); |
488 | static LabelDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
489 | |
490 | LabelStmt *getStmt() const { return TheStmt; } |
491 | void setStmt(LabelStmt *T) { TheStmt = T; } |
492 | |
493 | bool isGnuLocal() const { return LocStart != getLocation(); } |
494 | void setLocStart(SourceLocation L) { LocStart = L; } |
495 | |
496 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) { |
497 | return SourceRange(LocStart, getLocation()); |
498 | } |
499 | |
500 | bool isMSAsmLabel() const { return !MSAsmName.empty(); } |
501 | bool isResolvedMSAsmLabel() const { return isMSAsmLabel() && MSAsmNameResolved; } |
502 | void setMSAsmLabel(StringRef Name); |
503 | StringRef getMSAsmLabel() const { return MSAsmName; } |
504 | void setMSAsmLabelResolved() { MSAsmNameResolved = true; } |
505 | |
506 | // Implement isa/cast/dyncast/etc. |
507 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
508 | static bool classofKind(Kind K) { return K == Label; } |
509 | }; |
510 | |
511 | /// Represent a C++ namespace. |
512 | class NamespaceDecl : public NamedDecl, public DeclContext, |
513 | public Redeclarable<NamespaceDecl> |
514 | { |
515 | /// The starting location of the source range, pointing |
516 | /// to either the namespace or the inline keyword. |
517 | SourceLocation LocStart; |
518 | |
519 | /// The ending location of the source range. |
520 | SourceLocation RBraceLoc; |
521 | |
522 | /// A pointer to either the anonymous namespace that lives just inside |
523 | /// this namespace or to the first namespace in the chain (the latter case |
524 | /// only when this is not the first in the chain), along with a |
525 | /// boolean value indicating whether this is an inline namespace. |
526 | llvm::PointerIntPair<NamespaceDecl *, 1, bool> AnonOrFirstNamespaceAndInline; |
527 | |
528 | NamespaceDecl(ASTContext &C, DeclContext *DC, bool Inline, |
529 | SourceLocation StartLoc, SourceLocation IdLoc, |
530 | IdentifierInfo *Id, NamespaceDecl *PrevDecl); |
531 | |
532 | using redeclarable_base = Redeclarable<NamespaceDecl>; |
533 | |
534 | NamespaceDecl *getNextRedeclarationImpl() override; |
535 | NamespaceDecl *getPreviousDeclImpl() override; |
536 | NamespaceDecl *getMostRecentDeclImpl() override; |
537 | |
538 | public: |
539 | friend class ASTDeclReader; |
540 | friend class ASTDeclWriter; |
541 | |
542 | static NamespaceDecl *Create(ASTContext &C, DeclContext *DC, |
543 | bool Inline, SourceLocation StartLoc, |
544 | SourceLocation IdLoc, IdentifierInfo *Id, |
545 | NamespaceDecl *PrevDecl); |
546 | |
547 | static NamespaceDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
548 | |
549 | using redecl_range = redeclarable_base::redecl_range; |
550 | using redecl_iterator = redeclarable_base::redecl_iterator; |
551 | |
552 | using redeclarable_base::redecls_begin; |
553 | using redeclarable_base::redecls_end; |
554 | using redeclarable_base::redecls; |
555 | using redeclarable_base::getPreviousDecl; |
556 | using redeclarable_base::getMostRecentDecl; |
557 | using redeclarable_base::isFirstDecl; |
558 | |
559 | /// Returns true if this is an anonymous namespace declaration. |
560 | /// |
561 | /// For example: |
562 | /// \code |
563 | /// namespace { |
564 | /// ... |
565 | /// }; |
566 | /// \endcode |
567 | /// q.v. C++ [namespace.unnamed] |
568 | bool isAnonymousNamespace() const { |
569 | return !getIdentifier(); |
570 | } |
571 | |
572 | /// Returns true if this is an inline namespace declaration. |
573 | bool isInline() const { |
574 | return AnonOrFirstNamespaceAndInline.getInt(); |
575 | } |
576 | |
577 | /// Set whether this is an inline namespace declaration. |
578 | void setInline(bool Inline) { |
579 | AnonOrFirstNamespaceAndInline.setInt(Inline); |
580 | } |
581 | |
582 | /// Get the original (first) namespace declaration. |
583 | NamespaceDecl *getOriginalNamespace(); |
584 | |
585 | /// Get the original (first) namespace declaration. |
586 | const NamespaceDecl *getOriginalNamespace() const; |
587 | |
588 | /// Return true if this declaration is an original (first) declaration |
589 | /// of the namespace. This is false for non-original (subsequent) namespace |
590 | /// declarations and anonymous namespaces. |
591 | bool isOriginalNamespace() const; |
592 | |
593 | /// Retrieve the anonymous namespace nested inside this namespace, |
594 | /// if any. |
595 | NamespaceDecl *getAnonymousNamespace() const { |
596 | return getOriginalNamespace()->AnonOrFirstNamespaceAndInline.getPointer(); |
597 | } |
598 | |
599 | void setAnonymousNamespace(NamespaceDecl *D) { |
600 | getOriginalNamespace()->AnonOrFirstNamespaceAndInline.setPointer(D); |
601 | } |
602 | |
603 | /// Retrieves the canonical declaration of this namespace. |
604 | NamespaceDecl *getCanonicalDecl() override { |
605 | return getOriginalNamespace(); |
606 | } |
607 | const NamespaceDecl *getCanonicalDecl() const { |
608 | return getOriginalNamespace(); |
609 | } |
610 | |
611 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) { |
612 | return SourceRange(LocStart, RBraceLoc); |
613 | } |
614 | |
615 | SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return LocStart; } |
616 | SourceLocation getRBraceLoc() const { return RBraceLoc; } |
617 | void setLocStart(SourceLocation L) { LocStart = L; } |
618 | void setRBraceLoc(SourceLocation L) { RBraceLoc = L; } |
619 | |
620 | // Implement isa/cast/dyncast/etc. |
621 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
622 | static bool classofKind(Kind K) { return K == Namespace; } |
623 | static DeclContext *castToDeclContext(const NamespaceDecl *D) { |
624 | return static_cast<DeclContext *>(const_cast<NamespaceDecl*>(D)); |
625 | } |
626 | static NamespaceDecl *castFromDeclContext(const DeclContext *DC) { |
627 | return static_cast<NamespaceDecl *>(const_cast<DeclContext*>(DC)); |
628 | } |
629 | }; |
630 | |
631 | /// Represent the declaration of a variable (in which case it is |
632 | /// an lvalue) a function (in which case it is a function designator) or |
633 | /// an enum constant. |
634 | class ValueDecl : public NamedDecl { |
635 | QualType DeclType; |
636 | |
637 | void anchor() override; |
638 | |
639 | protected: |
640 | ValueDecl(Kind DK, DeclContext *DC, SourceLocation L, |
641 | DeclarationName N, QualType T) |
642 | : NamedDecl(DK, DC, L, N), DeclType(T) {} |
643 | |
644 | public: |
645 | QualType getType() const { return DeclType; } |
646 | void setType(QualType newType) { DeclType = newType; } |
647 | |
648 | /// Determine whether this symbol is weakly-imported, |
649 | /// or declared with the weak or weak-ref attr. |
650 | bool isWeak() const; |
651 | |
652 | // Implement isa/cast/dyncast/etc. |
653 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
654 | static bool classofKind(Kind K) { return K >= firstValue && K <= lastValue; } |
655 | }; |
656 | |
657 | /// A struct with extended info about a syntactic |
658 | /// name qualifier, to be used for the case of out-of-line declarations. |
659 | struct QualifierInfo { |
660 | NestedNameSpecifierLoc QualifierLoc; |
661 | |
662 | /// The number of "outer" template parameter lists. |
663 | /// The count includes all of the template parameter lists that were matched |
664 | /// against the template-ids occurring into the NNS and possibly (in the |
665 | /// case of an explicit specialization) a final "template <>". |
666 | unsigned NumTemplParamLists = 0; |
667 | |
668 | /// A new-allocated array of size NumTemplParamLists, |
669 | /// containing pointers to the "outer" template parameter lists. |
670 | /// It includes all of the template parameter lists that were matched |
671 | /// against the template-ids occurring into the NNS and possibly (in the |
672 | /// case of an explicit specialization) a final "template <>". |
673 | TemplateParameterList** TemplParamLists = nullptr; |
674 | |
675 | QualifierInfo() = default; |
676 | QualifierInfo(const QualifierInfo &) = delete; |
677 | QualifierInfo& operator=(const QualifierInfo &) = delete; |
678 | |
679 | /// Sets info about "outer" template parameter lists. |
680 | void setTemplateParameterListsInfo(ASTContext &Context, |
681 | ArrayRef<TemplateParameterList *> TPLists); |
682 | }; |
683 | |
684 | /// Represents a ValueDecl that came out of a declarator. |
685 | /// Contains type source information through TypeSourceInfo. |
686 | class DeclaratorDecl : public ValueDecl { |
687 | // A struct representing a TInfo, a trailing requires-clause and a syntactic |
688 | // qualifier, to be used for the (uncommon) case of out-of-line declarations |
689 | // and constrained function decls. |
690 | struct ExtInfo : public QualifierInfo { |
691 | TypeSourceInfo *TInfo; |
692 | Expr *TrailingRequiresClause = nullptr; |
693 | }; |
694 | |
695 | llvm::PointerUnion<TypeSourceInfo *, ExtInfo *> DeclInfo; |
696 | |
697 | /// The start of the source range for this declaration, |
698 | /// ignoring outer template declarations. |
699 | SourceLocation InnerLocStart; |
700 | |
701 | bool hasExtInfo() const { return DeclInfo.is<ExtInfo*>(); } |
702 | ExtInfo *getExtInfo() { return DeclInfo.get<ExtInfo*>(); } |
703 | const ExtInfo *getExtInfo() const { return DeclInfo.get<ExtInfo*>(); } |
704 | |
705 | protected: |
706 | DeclaratorDecl(Kind DK, DeclContext *DC, SourceLocation L, |
707 | DeclarationName N, QualType T, TypeSourceInfo *TInfo, |
708 | SourceLocation StartL) |
709 | : ValueDecl(DK, DC, L, N, T), DeclInfo(TInfo), InnerLocStart(StartL) {} |
710 | |
711 | public: |
712 | friend class ASTDeclReader; |
713 | friend class ASTDeclWriter; |
714 | |
715 | TypeSourceInfo *getTypeSourceInfo() const { |
716 | return hasExtInfo() |
717 | ? getExtInfo()->TInfo |
718 | : DeclInfo.get<TypeSourceInfo*>(); |
719 | } |
720 | |
721 | void setTypeSourceInfo(TypeSourceInfo *TI) { |
722 | if (hasExtInfo()) |
723 | getExtInfo()->TInfo = TI; |
724 | else |
725 | DeclInfo = TI; |
726 | } |
727 | |
728 | /// Return start of source range ignoring outer template declarations. |
729 | SourceLocation getInnerLocStart() const { return InnerLocStart; } |
730 | void setInnerLocStart(SourceLocation L) { InnerLocStart = L; } |
731 | |
732 | /// Return start of source range taking into account any outer template |
733 | /// declarations. |
734 | SourceLocation getOuterLocStart() const; |
735 | |
736 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
737 | |
738 | SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { |
739 | return getOuterLocStart(); |
740 | } |
741 | |
742 | /// Retrieve the nested-name-specifier that qualifies the name of this |
743 | /// declaration, if it was present in the source. |
744 | NestedNameSpecifier *getQualifier() const { |
745 | return hasExtInfo() ? getExtInfo()->QualifierLoc.getNestedNameSpecifier() |
746 | : nullptr; |
747 | } |
748 | |
749 | /// Retrieve the nested-name-specifier (with source-location |
750 | /// information) that qualifies the name of this declaration, if it was |
751 | /// present in the source. |
752 | NestedNameSpecifierLoc getQualifierLoc() const { |
753 | return hasExtInfo() ? getExtInfo()->QualifierLoc |
754 | : NestedNameSpecifierLoc(); |
755 | } |
756 | |
757 | void setQualifierInfo(NestedNameSpecifierLoc QualifierLoc); |
758 | |
759 | /// \brief Get the constraint-expression introduced by the trailing |
760 | /// requires-clause in the function/member declaration, or null if no |
761 | /// requires-clause was provided. |
762 | Expr *getTrailingRequiresClause() { |
763 | return hasExtInfo() ? getExtInfo()->TrailingRequiresClause |
764 | : nullptr; |
765 | } |
766 | |
767 | const Expr *getTrailingRequiresClause() const { |
768 | return hasExtInfo() ? getExtInfo()->TrailingRequiresClause |
769 | : nullptr; |
770 | } |
771 | |
772 | void setTrailingRequiresClause(Expr *TrailingRequiresClause); |
773 | |
774 | unsigned getNumTemplateParameterLists() const { |
775 | return hasExtInfo() ? getExtInfo()->NumTemplParamLists : 0; |
776 | } |
777 | |
778 | TemplateParameterList *getTemplateParameterList(unsigned index) const { |
779 | assert(index < getNumTemplateParameterLists())((index < getNumTemplateParameterLists()) ? static_cast< void> (0) : __assert_fail ("index < getNumTemplateParameterLists()" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 779, __PRETTY_FUNCTION__)); |
780 | return getExtInfo()->TemplParamLists[index]; |
781 | } |
782 | |
783 | void setTemplateParameterListsInfo(ASTContext &Context, |
784 | ArrayRef<TemplateParameterList *> TPLists); |
785 | |
786 | SourceLocation getTypeSpecStartLoc() const; |
787 | SourceLocation getTypeSpecEndLoc() const; |
788 | |
789 | // Implement isa/cast/dyncast/etc. |
790 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
791 | static bool classofKind(Kind K) { |
792 | return K >= firstDeclarator && K <= lastDeclarator; |
793 | } |
794 | }; |
795 | |
796 | /// Structure used to store a statement, the constant value to |
797 | /// which it was evaluated (if any), and whether or not the statement |
798 | /// is an integral constant expression (if known). |
799 | struct EvaluatedStmt { |
800 | /// Whether this statement was already evaluated. |
801 | bool WasEvaluated : 1; |
802 | |
803 | /// Whether this statement is being evaluated. |
804 | bool IsEvaluating : 1; |
805 | |
806 | /// Whether this variable is known to have constant initialization. This is |
807 | /// currently only computed in C++, for static / thread storage duration |
808 | /// variables that might have constant initialization and for variables that |
809 | /// are usable in constant expressions. |
810 | bool HasConstantInitialization : 1; |
811 | |
812 | /// Whether this variable is known to have constant destruction. That is, |
813 | /// whether running the destructor on the initial value is a side-effect |
814 | /// (and doesn't inspect any state that might have changed during program |
815 | /// execution). This is currently only computed if the destructor is |
816 | /// non-trivial. |
817 | bool HasConstantDestruction : 1; |
818 | |
819 | /// In C++98, whether the initializer is an ICE. This affects whether the |
820 | /// variable is usable in constant expressions. |
821 | bool HasICEInit : 1; |
822 | bool CheckedForICEInit : 1; |
823 | |
824 | Stmt *Value; |
825 | APValue Evaluated; |
826 | |
827 | EvaluatedStmt() |
828 | : WasEvaluated(false), IsEvaluating(false), |
829 | HasConstantInitialization(false), HasConstantDestruction(false), |
830 | HasICEInit(false), CheckedForICEInit(false) {} |
831 | }; |
832 | |
833 | /// Represents a variable declaration or definition. |
834 | class VarDecl : public DeclaratorDecl, public Redeclarable<VarDecl> { |
835 | public: |
836 | /// Initialization styles. |
837 | enum InitializationStyle { |
838 | /// C-style initialization with assignment |
839 | CInit, |
840 | |
841 | /// Call-style initialization (C++98) |
842 | CallInit, |
843 | |
844 | /// Direct list-initialization (C++11) |
845 | ListInit |
846 | }; |
847 | |
848 | /// Kinds of thread-local storage. |
849 | enum TLSKind { |
850 | /// Not a TLS variable. |
851 | TLS_None, |
852 | |
853 | /// TLS with a known-constant initializer. |
854 | TLS_Static, |
855 | |
856 | /// TLS with a dynamic initializer. |
857 | TLS_Dynamic |
858 | }; |
859 | |
860 | /// Return the string used to specify the storage class \p SC. |
861 | /// |
862 | /// It is illegal to call this function with SC == None. |
863 | static const char *getStorageClassSpecifierString(StorageClass SC); |
864 | |
865 | protected: |
866 | // A pointer union of Stmt * and EvaluatedStmt *. When an EvaluatedStmt, we |
867 | // have allocated the auxiliary struct of information there. |
868 | // |
869 | // TODO: It is a bit unfortunate to use a PointerUnion inside the VarDecl for |
870 | // this as *many* VarDecls are ParmVarDecls that don't have default |
871 | // arguments. We could save some space by moving this pointer union to be |
872 | // allocated in trailing space when necessary. |
873 | using InitType = llvm::PointerUnion<Stmt *, EvaluatedStmt *>; |
874 | |
875 | /// The initializer for this variable or, for a ParmVarDecl, the |
876 | /// C++ default argument. |
877 | mutable InitType Init; |
878 | |
879 | private: |
880 | friend class ASTDeclReader; |
881 | friend class ASTNodeImporter; |
882 | friend class StmtIteratorBase; |
883 | |
884 | class VarDeclBitfields { |
885 | friend class ASTDeclReader; |
886 | friend class VarDecl; |
887 | |
888 | unsigned SClass : 3; |
889 | unsigned TSCSpec : 2; |
890 | unsigned InitStyle : 2; |
891 | |
892 | /// Whether this variable is an ARC pseudo-__strong variable; see |
893 | /// isARCPseudoStrong() for details. |
894 | unsigned ARCPseudoStrong : 1; |
895 | }; |
896 | enum { NumVarDeclBits = 8 }; |
897 | |
898 | protected: |
899 | enum { NumParameterIndexBits = 8 }; |
900 | |
901 | enum DefaultArgKind { |
902 | DAK_None, |
903 | DAK_Unparsed, |
904 | DAK_Uninstantiated, |
905 | DAK_Normal |
906 | }; |
907 | |
908 | enum { NumScopeDepthOrObjCQualsBits = 7 }; |
909 | |
910 | class ParmVarDeclBitfields { |
911 | friend class ASTDeclReader; |
912 | friend class ParmVarDecl; |
913 | |
914 | unsigned : NumVarDeclBits; |
915 | |
916 | /// Whether this parameter inherits a default argument from a |
917 | /// prior declaration. |
918 | unsigned HasInheritedDefaultArg : 1; |
919 | |
920 | /// Describes the kind of default argument for this parameter. By default |
921 | /// this is none. If this is normal, then the default argument is stored in |
922 | /// the \c VarDecl initializer expression unless we were unable to parse |
923 | /// (even an invalid) expression for the default argument. |
924 | unsigned DefaultArgKind : 2; |
925 | |
926 | /// Whether this parameter undergoes K&R argument promotion. |
927 | unsigned IsKNRPromoted : 1; |
928 | |
929 | /// Whether this parameter is an ObjC method parameter or not. |
930 | unsigned IsObjCMethodParam : 1; |
931 | |
932 | /// If IsObjCMethodParam, a Decl::ObjCDeclQualifier. |
933 | /// Otherwise, the number of function parameter scopes enclosing |
934 | /// the function parameter scope in which this parameter was |
935 | /// declared. |
936 | unsigned ScopeDepthOrObjCQuals : NumScopeDepthOrObjCQualsBits; |
937 | |
938 | /// The number of parameters preceding this parameter in the |
939 | /// function parameter scope in which it was declared. |
940 | unsigned ParameterIndex : NumParameterIndexBits; |
941 | }; |
942 | |
943 | class NonParmVarDeclBitfields { |
944 | friend class ASTDeclReader; |
945 | friend class ImplicitParamDecl; |
946 | friend class VarDecl; |
947 | |
948 | unsigned : NumVarDeclBits; |
949 | |
950 | // FIXME: We need something similar to CXXRecordDecl::DefinitionData. |
951 | /// Whether this variable is a definition which was demoted due to |
952 | /// module merge. |
953 | unsigned IsThisDeclarationADemotedDefinition : 1; |
954 | |
955 | /// Whether this variable is the exception variable in a C++ catch |
956 | /// or an Objective-C @catch statement. |
957 | unsigned ExceptionVar : 1; |
958 | |
959 | /// Whether this local variable could be allocated in the return |
960 | /// slot of its function, enabling the named return value optimization |
961 | /// (NRVO). |
962 | unsigned NRVOVariable : 1; |
963 | |
964 | /// Whether this variable is the for-range-declaration in a C++0x |
965 | /// for-range statement. |
966 | unsigned CXXForRangeDecl : 1; |
967 | |
968 | /// Whether this variable is the for-in loop declaration in Objective-C. |
969 | unsigned ObjCForDecl : 1; |
970 | |
971 | /// Whether this variable is (C++1z) inline. |
972 | unsigned IsInline : 1; |
973 | |
974 | /// Whether this variable has (C++1z) inline explicitly specified. |
975 | unsigned IsInlineSpecified : 1; |
976 | |
977 | /// Whether this variable is (C++0x) constexpr. |
978 | unsigned IsConstexpr : 1; |
979 | |
980 | /// Whether this variable is the implicit variable for a lambda |
981 | /// init-capture. |
982 | unsigned IsInitCapture : 1; |
983 | |
984 | /// Whether this local extern variable's previous declaration was |
985 | /// declared in the same block scope. This controls whether we should merge |
986 | /// the type of this declaration with its previous declaration. |
987 | unsigned PreviousDeclInSameBlockScope : 1; |
988 | |
989 | /// Defines kind of the ImplicitParamDecl: 'this', 'self', 'vtt', '_cmd' or |
990 | /// something else. |
991 | unsigned ImplicitParamKind : 3; |
992 | |
993 | unsigned EscapingByref : 1; |
994 | }; |
995 | |
996 | union { |
997 | unsigned AllBits; |
998 | VarDeclBitfields VarDeclBits; |
999 | ParmVarDeclBitfields ParmVarDeclBits; |
1000 | NonParmVarDeclBitfields NonParmVarDeclBits; |
1001 | }; |
1002 | |
1003 | VarDecl(Kind DK, ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
1004 | SourceLocation IdLoc, IdentifierInfo *Id, QualType T, |
1005 | TypeSourceInfo *TInfo, StorageClass SC); |
1006 | |
1007 | using redeclarable_base = Redeclarable<VarDecl>; |
1008 | |
1009 | VarDecl *getNextRedeclarationImpl() override { |
1010 | return getNextRedeclaration(); |
1011 | } |
1012 | |
1013 | VarDecl *getPreviousDeclImpl() override { |
1014 | return getPreviousDecl(); |
1015 | } |
1016 | |
1017 | VarDecl *getMostRecentDeclImpl() override { |
1018 | return getMostRecentDecl(); |
1019 | } |
1020 | |
1021 | public: |
1022 | using redecl_range = redeclarable_base::redecl_range; |
1023 | using redecl_iterator = redeclarable_base::redecl_iterator; |
1024 | |
1025 | using redeclarable_base::redecls_begin; |
1026 | using redeclarable_base::redecls_end; |
1027 | using redeclarable_base::redecls; |
1028 | using redeclarable_base::getPreviousDecl; |
1029 | using redeclarable_base::getMostRecentDecl; |
1030 | using redeclarable_base::isFirstDecl; |
1031 | |
1032 | static VarDecl *Create(ASTContext &C, DeclContext *DC, |
1033 | SourceLocation StartLoc, SourceLocation IdLoc, |
1034 | IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo, |
1035 | StorageClass S); |
1036 | |
1037 | static VarDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
1038 | |
1039 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
1040 | |
1041 | /// Returns the storage class as written in the source. For the |
1042 | /// computed linkage of symbol, see getLinkage. |
1043 | StorageClass getStorageClass() const { |
1044 | return (StorageClass) VarDeclBits.SClass; |
1045 | } |
1046 | void setStorageClass(StorageClass SC); |
1047 | |
1048 | void setTSCSpec(ThreadStorageClassSpecifier TSC) { |
1049 | VarDeclBits.TSCSpec = TSC; |
1050 | assert(VarDeclBits.TSCSpec == TSC && "truncation")((VarDeclBits.TSCSpec == TSC && "truncation") ? static_cast <void> (0) : __assert_fail ("VarDeclBits.TSCSpec == TSC && \"truncation\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 1050, __PRETTY_FUNCTION__)); |
1051 | } |
1052 | ThreadStorageClassSpecifier getTSCSpec() const { |
1053 | return static_cast<ThreadStorageClassSpecifier>(VarDeclBits.TSCSpec); |
1054 | } |
1055 | TLSKind getTLSKind() const; |
1056 | |
1057 | /// Returns true if a variable with function scope is a non-static local |
1058 | /// variable. |
1059 | bool hasLocalStorage() const { |
1060 | if (getStorageClass() == SC_None) { |
1061 | // OpenCL v1.2 s6.5.3: The __constant or constant address space name is |
1062 | // used to describe variables allocated in global memory and which are |
1063 | // accessed inside a kernel(s) as read-only variables. As such, variables |
1064 | // in constant address space cannot have local storage. |
1065 | if (getType().getAddressSpace() == LangAS::opencl_constant) |
1066 | return false; |
1067 | // Second check is for C++11 [dcl.stc]p4. |
1068 | return !isFileVarDecl() && getTSCSpec() == TSCS_unspecified; |
1069 | } |
1070 | |
1071 | // Global Named Register (GNU extension) |
1072 | if (getStorageClass() == SC_Register && !isLocalVarDeclOrParm()) |
1073 | return false; |
1074 | |
1075 | // Return true for: Auto, Register. |
1076 | // Return false for: Extern, Static, PrivateExtern, OpenCLWorkGroupLocal. |
1077 | |
1078 | return getStorageClass() >= SC_Auto; |
1079 | } |
1080 | |
1081 | /// Returns true if a variable with function scope is a static local |
1082 | /// variable. |
1083 | bool isStaticLocal() const { |
1084 | return (getStorageClass() == SC_Static || |
1085 | // C++11 [dcl.stc]p4 |
1086 | (getStorageClass() == SC_None && getTSCSpec() == TSCS_thread_local)) |
1087 | && !isFileVarDecl(); |
1088 | } |
1089 | |
1090 | /// Returns true if a variable has extern or __private_extern__ |
1091 | /// storage. |
1092 | bool hasExternalStorage() const { |
1093 | return getStorageClass() == SC_Extern || |
1094 | getStorageClass() == SC_PrivateExtern; |
1095 | } |
1096 | |
1097 | /// Returns true for all variables that do not have local storage. |
1098 | /// |
1099 | /// This includes all global variables as well as static variables declared |
1100 | /// within a function. |
1101 | bool hasGlobalStorage() const { return !hasLocalStorage(); } |
1102 | |
1103 | /// Get the storage duration of this variable, per C++ [basic.stc]. |
1104 | StorageDuration getStorageDuration() const { |
1105 | return hasLocalStorage() ? SD_Automatic : |
1106 | getTSCSpec() ? SD_Thread : SD_Static; |
1107 | } |
1108 | |
1109 | /// Compute the language linkage. |
1110 | LanguageLinkage getLanguageLinkage() const; |
1111 | |
1112 | /// Determines whether this variable is a variable with external, C linkage. |
1113 | bool isExternC() const; |
1114 | |
1115 | /// Determines whether this variable's context is, or is nested within, |
1116 | /// a C++ extern "C" linkage spec. |
1117 | bool isInExternCContext() const; |
1118 | |
1119 | /// Determines whether this variable's context is, or is nested within, |
1120 | /// a C++ extern "C++" linkage spec. |
1121 | bool isInExternCXXContext() const; |
1122 | |
1123 | /// Returns true for local variable declarations other than parameters. |
1124 | /// Note that this includes static variables inside of functions. It also |
1125 | /// includes variables inside blocks. |
1126 | /// |
1127 | /// void foo() { int x; static int y; extern int z; } |
1128 | bool isLocalVarDecl() const { |
1129 | if (getKind() != Decl::Var && getKind() != Decl::Decomposition) |
1130 | return false; |
1131 | if (const DeclContext *DC = getLexicalDeclContext()) |
1132 | return DC->getRedeclContext()->isFunctionOrMethod(); |
1133 | return false; |
1134 | } |
1135 | |
1136 | /// Similar to isLocalVarDecl but also includes parameters. |
1137 | bool isLocalVarDeclOrParm() const { |
1138 | return isLocalVarDecl() || getKind() == Decl::ParmVar; |
1139 | } |
1140 | |
1141 | /// Similar to isLocalVarDecl, but excludes variables declared in blocks. |
1142 | bool isFunctionOrMethodVarDecl() const { |
1143 | if (getKind() != Decl::Var && getKind() != Decl::Decomposition) |
1144 | return false; |
1145 | const DeclContext *DC = getLexicalDeclContext()->getRedeclContext(); |
1146 | return DC->isFunctionOrMethod() && DC->getDeclKind() != Decl::Block; |
1147 | } |
1148 | |
1149 | /// Determines whether this is a static data member. |
1150 | /// |
1151 | /// This will only be true in C++, and applies to, e.g., the |
1152 | /// variable 'x' in: |
1153 | /// \code |
1154 | /// struct S { |
1155 | /// static int x; |
1156 | /// }; |
1157 | /// \endcode |
1158 | bool isStaticDataMember() const { |
1159 | // If it wasn't static, it would be a FieldDecl. |
1160 | return getKind() != Decl::ParmVar && getDeclContext()->isRecord(); |
1161 | } |
1162 | |
1163 | VarDecl *getCanonicalDecl() override; |
1164 | const VarDecl *getCanonicalDecl() const { |
1165 | return const_cast<VarDecl*>(this)->getCanonicalDecl(); |
1166 | } |
1167 | |
1168 | enum DefinitionKind { |
1169 | /// This declaration is only a declaration. |
1170 | DeclarationOnly, |
1171 | |
1172 | /// This declaration is a tentative definition. |
1173 | TentativeDefinition, |
1174 | |
1175 | /// This declaration is definitely a definition. |
1176 | Definition |
1177 | }; |
1178 | |
1179 | /// Check whether this declaration is a definition. If this could be |
1180 | /// a tentative definition (in C), don't check whether there's an overriding |
1181 | /// definition. |
1182 | DefinitionKind isThisDeclarationADefinition(ASTContext &) const; |
1183 | DefinitionKind isThisDeclarationADefinition() const { |
1184 | return isThisDeclarationADefinition(getASTContext()); |
1185 | } |
1186 | |
1187 | /// Check whether this variable is defined in this translation unit. |
1188 | DefinitionKind hasDefinition(ASTContext &) const; |
1189 | DefinitionKind hasDefinition() const { |
1190 | return hasDefinition(getASTContext()); |
1191 | } |
1192 | |
1193 | /// Get the tentative definition that acts as the real definition in a TU. |
1194 | /// Returns null if there is a proper definition available. |
1195 | VarDecl *getActingDefinition(); |
1196 | const VarDecl *getActingDefinition() const { |
1197 | return const_cast<VarDecl*>(this)->getActingDefinition(); |
1198 | } |
1199 | |
1200 | /// Get the real (not just tentative) definition for this declaration. |
1201 | VarDecl *getDefinition(ASTContext &); |
1202 | const VarDecl *getDefinition(ASTContext &C) const { |
1203 | return const_cast<VarDecl*>(this)->getDefinition(C); |
1204 | } |
1205 | VarDecl *getDefinition() { |
1206 | return getDefinition(getASTContext()); |
1207 | } |
1208 | const VarDecl *getDefinition() const { |
1209 | return const_cast<VarDecl*>(this)->getDefinition(); |
1210 | } |
1211 | |
1212 | /// Determine whether this is or was instantiated from an out-of-line |
1213 | /// definition of a static data member. |
1214 | bool isOutOfLine() const override; |
1215 | |
1216 | /// Returns true for file scoped variable declaration. |
1217 | bool isFileVarDecl() const { |
1218 | Kind K = getKind(); |
1219 | if (K == ParmVar || K == ImplicitParam) |
1220 | return false; |
1221 | |
1222 | if (getLexicalDeclContext()->getRedeclContext()->isFileContext()) |
1223 | return true; |
1224 | |
1225 | if (isStaticDataMember()) |
1226 | return true; |
1227 | |
1228 | return false; |
1229 | } |
1230 | |
1231 | /// Get the initializer for this variable, no matter which |
1232 | /// declaration it is attached to. |
1233 | const Expr *getAnyInitializer() const { |
1234 | const VarDecl *D; |
1235 | return getAnyInitializer(D); |
1236 | } |
1237 | |
1238 | /// Get the initializer for this variable, no matter which |
1239 | /// declaration it is attached to. Also get that declaration. |
1240 | const Expr *getAnyInitializer(const VarDecl *&D) const; |
1241 | |
1242 | bool hasInit() const; |
1243 | const Expr *getInit() const { |
1244 | return const_cast<VarDecl *>(this)->getInit(); |
1245 | } |
1246 | Expr *getInit(); |
1247 | |
1248 | /// Retrieve the address of the initializer expression. |
1249 | Stmt **getInitAddress(); |
1250 | |
1251 | void setInit(Expr *I); |
1252 | |
1253 | /// Get the initializing declaration of this variable, if any. This is |
1254 | /// usually the definition, except that for a static data member it can be |
1255 | /// the in-class declaration. |
1256 | VarDecl *getInitializingDeclaration(); |
1257 | const VarDecl *getInitializingDeclaration() const { |
1258 | return const_cast<VarDecl *>(this)->getInitializingDeclaration(); |
1259 | } |
1260 | |
1261 | /// Determine whether this variable's value might be usable in a |
1262 | /// constant expression, according to the relevant language standard. |
1263 | /// This only checks properties of the declaration, and does not check |
1264 | /// whether the initializer is in fact a constant expression. |
1265 | /// |
1266 | /// This corresponds to C++20 [expr.const]p3's notion of a |
1267 | /// "potentially-constant" variable. |
1268 | bool mightBeUsableInConstantExpressions(const ASTContext &C) const; |
1269 | |
1270 | /// Determine whether this variable's value can be used in a |
1271 | /// constant expression, according to the relevant language standard, |
1272 | /// including checking whether it was initialized by a constant expression. |
1273 | bool isUsableInConstantExpressions(const ASTContext &C) const; |
1274 | |
1275 | EvaluatedStmt *ensureEvaluatedStmt() const; |
1276 | EvaluatedStmt *getEvaluatedStmt() const; |
1277 | |
1278 | /// Attempt to evaluate the value of the initializer attached to this |
1279 | /// declaration, and produce notes explaining why it cannot be evaluated. |
1280 | /// Returns a pointer to the value if evaluation succeeded, 0 otherwise. |
1281 | APValue *evaluateValue() const; |
1282 | |
1283 | private: |
1284 | APValue *evaluateValueImpl(SmallVectorImpl<PartialDiagnosticAt> &Notes, |
1285 | bool IsConstantInitialization) const; |
1286 | |
1287 | public: |
1288 | /// Return the already-evaluated value of this variable's |
1289 | /// initializer, or NULL if the value is not yet known. Returns pointer |
1290 | /// to untyped APValue if the value could not be evaluated. |
1291 | APValue *getEvaluatedValue() const; |
1292 | |
1293 | /// Evaluate the destruction of this variable to determine if it constitutes |
1294 | /// constant destruction. |
1295 | /// |
1296 | /// \pre hasConstantInitialization() |
1297 | /// \return \c true if this variable has constant destruction, \c false if |
1298 | /// not. |
1299 | bool evaluateDestruction(SmallVectorImpl<PartialDiagnosticAt> &Notes) const; |
1300 | |
1301 | /// Determine whether this variable has constant initialization. |
1302 | /// |
1303 | /// This is only set in two cases: when the language semantics require |
1304 | /// constant initialization (globals in C and some globals in C++), and when |
1305 | /// the variable is usable in constant expressions (constexpr, const int, and |
1306 | /// reference variables in C++). |
1307 | bool hasConstantInitialization() const; |
1308 | |
1309 | /// Determine whether the initializer of this variable is an integer constant |
1310 | /// expression. For use in C++98, where this affects whether the variable is |
1311 | /// usable in constant expressions. |
1312 | bool hasICEInitializer(const ASTContext &Context) const; |
1313 | |
1314 | /// Evaluate the initializer of this variable to determine whether it's a |
1315 | /// constant initializer. Should only be called once, after completing the |
1316 | /// definition of the variable. |
1317 | bool checkForConstantInitialization( |
1318 | SmallVectorImpl<PartialDiagnosticAt> &Notes) const; |
1319 | |
1320 | void setInitStyle(InitializationStyle Style) { |
1321 | VarDeclBits.InitStyle = Style; |
1322 | } |
1323 | |
1324 | /// The style of initialization for this declaration. |
1325 | /// |
1326 | /// C-style initialization is "int x = 1;". Call-style initialization is |
1327 | /// a C++98 direct-initializer, e.g. "int x(1);". The Init expression will be |
1328 | /// the expression inside the parens or a "ClassType(a,b,c)" class constructor |
1329 | /// expression for class types. List-style initialization is C++11 syntax, |
1330 | /// e.g. "int x{1};". Clients can distinguish between different forms of |
1331 | /// initialization by checking this value. In particular, "int x = {1};" is |
1332 | /// C-style, "int x({1})" is call-style, and "int x{1};" is list-style; the |
1333 | /// Init expression in all three cases is an InitListExpr. |
1334 | InitializationStyle getInitStyle() const { |
1335 | return static_cast<InitializationStyle>(VarDeclBits.InitStyle); |
1336 | } |
1337 | |
1338 | /// Whether the initializer is a direct-initializer (list or call). |
1339 | bool isDirectInit() const { |
1340 | return getInitStyle() != CInit; |
1341 | } |
1342 | |
1343 | /// If this definition should pretend to be a declaration. |
1344 | bool isThisDeclarationADemotedDefinition() const { |
1345 | return isa<ParmVarDecl>(this) ? false : |
1346 | NonParmVarDeclBits.IsThisDeclarationADemotedDefinition; |
1347 | } |
1348 | |
1349 | /// This is a definition which should be demoted to a declaration. |
1350 | /// |
1351 | /// In some cases (mostly module merging) we can end up with two visible |
1352 | /// definitions one of which needs to be demoted to a declaration to keep |
1353 | /// the AST invariants. |
1354 | void demoteThisDefinitionToDeclaration() { |
1355 | assert(isThisDeclarationADefinition() && "Not a definition!")((isThisDeclarationADefinition() && "Not a definition!" ) ? static_cast<void> (0) : __assert_fail ("isThisDeclarationADefinition() && \"Not a definition!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 1355, __PRETTY_FUNCTION__)); |
1356 | assert(!isa<ParmVarDecl>(this) && "Cannot demote ParmVarDecls!")((!isa<ParmVarDecl>(this) && "Cannot demote ParmVarDecls!" ) ? static_cast<void> (0) : __assert_fail ("!isa<ParmVarDecl>(this) && \"Cannot demote ParmVarDecls!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 1356, __PRETTY_FUNCTION__)); |
1357 | NonParmVarDeclBits.IsThisDeclarationADemotedDefinition = 1; |
1358 | } |
1359 | |
1360 | /// Determine whether this variable is the exception variable in a |
1361 | /// C++ catch statememt or an Objective-C \@catch statement. |
1362 | bool isExceptionVariable() const { |
1363 | return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.ExceptionVar; |
1364 | } |
1365 | void setExceptionVariable(bool EV) { |
1366 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 1366, __PRETTY_FUNCTION__)); |
1367 | NonParmVarDeclBits.ExceptionVar = EV; |
1368 | } |
1369 | |
1370 | /// Determine whether this local variable can be used with the named |
1371 | /// return value optimization (NRVO). |
1372 | /// |
1373 | /// The named return value optimization (NRVO) works by marking certain |
1374 | /// non-volatile local variables of class type as NRVO objects. These |
1375 | /// locals can be allocated within the return slot of their containing |
1376 | /// function, in which case there is no need to copy the object to the |
1377 | /// return slot when returning from the function. Within the function body, |
1378 | /// each return that returns the NRVO object will have this variable as its |
1379 | /// NRVO candidate. |
1380 | bool isNRVOVariable() const { |
1381 | return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.NRVOVariable; |
1382 | } |
1383 | void setNRVOVariable(bool NRVO) { |
1384 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 1384, __PRETTY_FUNCTION__)); |
1385 | NonParmVarDeclBits.NRVOVariable = NRVO; |
1386 | } |
1387 | |
1388 | /// Determine whether this variable is the for-range-declaration in |
1389 | /// a C++0x for-range statement. |
1390 | bool isCXXForRangeDecl() const { |
1391 | return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.CXXForRangeDecl; |
1392 | } |
1393 | void setCXXForRangeDecl(bool FRD) { |
1394 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 1394, __PRETTY_FUNCTION__)); |
1395 | NonParmVarDeclBits.CXXForRangeDecl = FRD; |
1396 | } |
1397 | |
1398 | /// Determine whether this variable is a for-loop declaration for a |
1399 | /// for-in statement in Objective-C. |
1400 | bool isObjCForDecl() const { |
1401 | return NonParmVarDeclBits.ObjCForDecl; |
1402 | } |
1403 | |
1404 | void setObjCForDecl(bool FRD) { |
1405 | NonParmVarDeclBits.ObjCForDecl = FRD; |
1406 | } |
1407 | |
1408 | /// Determine whether this variable is an ARC pseudo-__strong variable. A |
1409 | /// pseudo-__strong variable has a __strong-qualified type but does not |
1410 | /// actually retain the object written into it. Generally such variables are |
1411 | /// also 'const' for safety. There are 3 cases where this will be set, 1) if |
1412 | /// the variable is annotated with the objc_externally_retained attribute, 2) |
1413 | /// if its 'self' in a non-init method, or 3) if its the variable in an for-in |
1414 | /// loop. |
1415 | bool isARCPseudoStrong() const { return VarDeclBits.ARCPseudoStrong; } |
1416 | void setARCPseudoStrong(bool PS) { VarDeclBits.ARCPseudoStrong = PS; } |
1417 | |
1418 | /// Whether this variable is (C++1z) inline. |
1419 | bool isInline() const { |
1420 | return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.IsInline; |
1421 | } |
1422 | bool isInlineSpecified() const { |
1423 | return isa<ParmVarDecl>(this) ? false |
1424 | : NonParmVarDeclBits.IsInlineSpecified; |
1425 | } |
1426 | void setInlineSpecified() { |
1427 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 1427, __PRETTY_FUNCTION__)); |
1428 | NonParmVarDeclBits.IsInline = true; |
1429 | NonParmVarDeclBits.IsInlineSpecified = true; |
1430 | } |
1431 | void setImplicitlyInline() { |
1432 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 1432, __PRETTY_FUNCTION__)); |
1433 | NonParmVarDeclBits.IsInline = true; |
1434 | } |
1435 | |
1436 | /// Whether this variable is (C++11) constexpr. |
1437 | bool isConstexpr() const { |
1438 | return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.IsConstexpr; |
1439 | } |
1440 | void setConstexpr(bool IC) { |
1441 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 1441, __PRETTY_FUNCTION__)); |
1442 | NonParmVarDeclBits.IsConstexpr = IC; |
1443 | } |
1444 | |
1445 | /// Whether this variable is the implicit variable for a lambda init-capture. |
1446 | bool isInitCapture() const { |
1447 | return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.IsInitCapture; |
1448 | } |
1449 | void setInitCapture(bool IC) { |
1450 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 1450, __PRETTY_FUNCTION__)); |
1451 | NonParmVarDeclBits.IsInitCapture = IC; |
1452 | } |
1453 | |
1454 | /// Determine whether this variable is actually a function parameter pack or |
1455 | /// init-capture pack. |
1456 | bool isParameterPack() const; |
1457 | |
1458 | /// Whether this local extern variable declaration's previous declaration |
1459 | /// was declared in the same block scope. Only correct in C++. |
1460 | bool isPreviousDeclInSameBlockScope() const { |
1461 | return isa<ParmVarDecl>(this) |
1462 | ? false |
1463 | : NonParmVarDeclBits.PreviousDeclInSameBlockScope; |
1464 | } |
1465 | void setPreviousDeclInSameBlockScope(bool Same) { |
1466 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 1466, __PRETTY_FUNCTION__)); |
1467 | NonParmVarDeclBits.PreviousDeclInSameBlockScope = Same; |
1468 | } |
1469 | |
1470 | /// Indicates the capture is a __block variable that is captured by a block |
1471 | /// that can potentially escape (a block for which BlockDecl::doesNotEscape |
1472 | /// returns false). |
1473 | bool isEscapingByref() const; |
1474 | |
1475 | /// Indicates the capture is a __block variable that is never captured by an |
1476 | /// escaping block. |
1477 | bool isNonEscapingByref() const; |
1478 | |
1479 | void setEscapingByref() { |
1480 | NonParmVarDeclBits.EscapingByref = true; |
1481 | } |
1482 | |
1483 | /// Retrieve the variable declaration from which this variable could |
1484 | /// be instantiated, if it is an instantiation (rather than a non-template). |
1485 | VarDecl *getTemplateInstantiationPattern() const; |
1486 | |
1487 | /// If this variable is an instantiated static data member of a |
1488 | /// class template specialization, returns the templated static data member |
1489 | /// from which it was instantiated. |
1490 | VarDecl *getInstantiatedFromStaticDataMember() const; |
1491 | |
1492 | /// If this variable is an instantiation of a variable template or a |
1493 | /// static data member of a class template, determine what kind of |
1494 | /// template specialization or instantiation this is. |
1495 | TemplateSpecializationKind getTemplateSpecializationKind() const; |
1496 | |
1497 | /// Get the template specialization kind of this variable for the purposes of |
1498 | /// template instantiation. This differs from getTemplateSpecializationKind() |
1499 | /// for an instantiation of a class-scope explicit specialization. |
1500 | TemplateSpecializationKind |
1501 | getTemplateSpecializationKindForInstantiation() const; |
1502 | |
1503 | /// If this variable is an instantiation of a variable template or a |
1504 | /// static data member of a class template, determine its point of |
1505 | /// instantiation. |
1506 | SourceLocation getPointOfInstantiation() const; |
1507 | |
1508 | /// If this variable is an instantiation of a static data member of a |
1509 | /// class template specialization, retrieves the member specialization |
1510 | /// information. |
1511 | MemberSpecializationInfo *getMemberSpecializationInfo() const; |
1512 | |
1513 | /// For a static data member that was instantiated from a static |
1514 | /// data member of a class template, set the template specialiation kind. |
1515 | void setTemplateSpecializationKind(TemplateSpecializationKind TSK, |
1516 | SourceLocation PointOfInstantiation = SourceLocation()); |
1517 | |
1518 | /// Specify that this variable is an instantiation of the |
1519 | /// static data member VD. |
1520 | void setInstantiationOfStaticDataMember(VarDecl *VD, |
1521 | TemplateSpecializationKind TSK); |
1522 | |
1523 | /// Retrieves the variable template that is described by this |
1524 | /// variable declaration. |
1525 | /// |
1526 | /// Every variable template is represented as a VarTemplateDecl and a |
1527 | /// VarDecl. The former contains template properties (such as |
1528 | /// the template parameter lists) while the latter contains the |
1529 | /// actual description of the template's |
1530 | /// contents. VarTemplateDecl::getTemplatedDecl() retrieves the |
1531 | /// VarDecl that from a VarTemplateDecl, while |
1532 | /// getDescribedVarTemplate() retrieves the VarTemplateDecl from |
1533 | /// a VarDecl. |
1534 | VarTemplateDecl *getDescribedVarTemplate() const; |
1535 | |
1536 | void setDescribedVarTemplate(VarTemplateDecl *Template); |
1537 | |
1538 | // Is this variable known to have a definition somewhere in the complete |
1539 | // program? This may be true even if the declaration has internal linkage and |
1540 | // has no definition within this source file. |
1541 | bool isKnownToBeDefined() const; |
1542 | |
1543 | /// Is destruction of this variable entirely suppressed? If so, the variable |
1544 | /// need not have a usable destructor at all. |
1545 | bool isNoDestroy(const ASTContext &) const; |
1546 | |
1547 | /// Would the destruction of this variable have any effect, and if so, what |
1548 | /// kind? |
1549 | QualType::DestructionKind needsDestruction(const ASTContext &Ctx) const; |
1550 | |
1551 | // Implement isa/cast/dyncast/etc. |
1552 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
1553 | static bool classofKind(Kind K) { return K >= firstVar && K <= lastVar; } |
1554 | }; |
1555 | |
1556 | class ImplicitParamDecl : public VarDecl { |
1557 | void anchor() override; |
1558 | |
1559 | public: |
1560 | /// Defines the kind of the implicit parameter: is this an implicit parameter |
1561 | /// with pointer to 'this', 'self', '_cmd', virtual table pointers, captured |
1562 | /// context or something else. |
1563 | enum ImplicitParamKind : unsigned { |
1564 | /// Parameter for Objective-C 'self' argument |
1565 | ObjCSelf, |
1566 | |
1567 | /// Parameter for Objective-C '_cmd' argument |
1568 | ObjCCmd, |
1569 | |
1570 | /// Parameter for C++ 'this' argument |
1571 | CXXThis, |
1572 | |
1573 | /// Parameter for C++ virtual table pointers |
1574 | CXXVTT, |
1575 | |
1576 | /// Parameter for captured context |
1577 | CapturedContext, |
1578 | |
1579 | /// Other implicit parameter |
1580 | Other, |
1581 | }; |
1582 | |
1583 | /// Create implicit parameter. |
1584 | static ImplicitParamDecl *Create(ASTContext &C, DeclContext *DC, |
1585 | SourceLocation IdLoc, IdentifierInfo *Id, |
1586 | QualType T, ImplicitParamKind ParamKind); |
1587 | static ImplicitParamDecl *Create(ASTContext &C, QualType T, |
1588 | ImplicitParamKind ParamKind); |
1589 | |
1590 | static ImplicitParamDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
1591 | |
1592 | ImplicitParamDecl(ASTContext &C, DeclContext *DC, SourceLocation IdLoc, |
1593 | IdentifierInfo *Id, QualType Type, |
1594 | ImplicitParamKind ParamKind) |
1595 | : VarDecl(ImplicitParam, C, DC, IdLoc, IdLoc, Id, Type, |
1596 | /*TInfo=*/nullptr, SC_None) { |
1597 | NonParmVarDeclBits.ImplicitParamKind = ParamKind; |
1598 | setImplicit(); |
1599 | } |
1600 | |
1601 | ImplicitParamDecl(ASTContext &C, QualType Type, ImplicitParamKind ParamKind) |
1602 | : VarDecl(ImplicitParam, C, /*DC=*/nullptr, SourceLocation(), |
1603 | SourceLocation(), /*Id=*/nullptr, Type, |
1604 | /*TInfo=*/nullptr, SC_None) { |
1605 | NonParmVarDeclBits.ImplicitParamKind = ParamKind; |
1606 | setImplicit(); |
1607 | } |
1608 | |
1609 | /// Returns the implicit parameter kind. |
1610 | ImplicitParamKind getParameterKind() const { |
1611 | return static_cast<ImplicitParamKind>(NonParmVarDeclBits.ImplicitParamKind); |
1612 | } |
1613 | |
1614 | // Implement isa/cast/dyncast/etc. |
1615 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
1616 | static bool classofKind(Kind K) { return K == ImplicitParam; } |
1617 | }; |
1618 | |
1619 | /// Represents a parameter to a function. |
1620 | class ParmVarDecl : public VarDecl { |
1621 | public: |
1622 | enum { MaxFunctionScopeDepth = 255 }; |
1623 | enum { MaxFunctionScopeIndex = 255 }; |
1624 | |
1625 | protected: |
1626 | ParmVarDecl(Kind DK, ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
1627 | SourceLocation IdLoc, IdentifierInfo *Id, QualType T, |
1628 | TypeSourceInfo *TInfo, StorageClass S, Expr *DefArg) |
1629 | : VarDecl(DK, C, DC, StartLoc, IdLoc, Id, T, TInfo, S) { |
1630 | assert(ParmVarDeclBits.HasInheritedDefaultArg == false)((ParmVarDeclBits.HasInheritedDefaultArg == false) ? static_cast <void> (0) : __assert_fail ("ParmVarDeclBits.HasInheritedDefaultArg == false" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 1630, __PRETTY_FUNCTION__)); |
1631 | assert(ParmVarDeclBits.DefaultArgKind == DAK_None)((ParmVarDeclBits.DefaultArgKind == DAK_None) ? static_cast< void> (0) : __assert_fail ("ParmVarDeclBits.DefaultArgKind == DAK_None" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 1631, __PRETTY_FUNCTION__)); |
1632 | assert(ParmVarDeclBits.IsKNRPromoted == false)((ParmVarDeclBits.IsKNRPromoted == false) ? static_cast<void > (0) : __assert_fail ("ParmVarDeclBits.IsKNRPromoted == false" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 1632, __PRETTY_FUNCTION__)); |
1633 | assert(ParmVarDeclBits.IsObjCMethodParam == false)((ParmVarDeclBits.IsObjCMethodParam == false) ? static_cast< void> (0) : __assert_fail ("ParmVarDeclBits.IsObjCMethodParam == false" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 1633, __PRETTY_FUNCTION__)); |
1634 | setDefaultArg(DefArg); |
1635 | } |
1636 | |
1637 | public: |
1638 | static ParmVarDecl *Create(ASTContext &C, DeclContext *DC, |
1639 | SourceLocation StartLoc, |
1640 | SourceLocation IdLoc, IdentifierInfo *Id, |
1641 | QualType T, TypeSourceInfo *TInfo, |
1642 | StorageClass S, Expr *DefArg); |
1643 | |
1644 | static ParmVarDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
1645 | |
1646 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
1647 | |
1648 | void setObjCMethodScopeInfo(unsigned parameterIndex) { |
1649 | ParmVarDeclBits.IsObjCMethodParam = true; |
1650 | setParameterIndex(parameterIndex); |
1651 | } |
1652 | |
1653 | void setScopeInfo(unsigned scopeDepth, unsigned parameterIndex) { |
1654 | assert(!ParmVarDeclBits.IsObjCMethodParam)((!ParmVarDeclBits.IsObjCMethodParam) ? static_cast<void> (0) : __assert_fail ("!ParmVarDeclBits.IsObjCMethodParam", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 1654, __PRETTY_FUNCTION__)); |
1655 | |
1656 | ParmVarDeclBits.ScopeDepthOrObjCQuals = scopeDepth; |
1657 | assert(ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth((ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth && "truncation!") ? static_cast<void> (0) : __assert_fail ("ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth && \"truncation!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 1658, __PRETTY_FUNCTION__)) |
1658 | && "truncation!")((ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth && "truncation!") ? static_cast<void> (0) : __assert_fail ("ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth && \"truncation!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 1658, __PRETTY_FUNCTION__)); |
1659 | |
1660 | setParameterIndex(parameterIndex); |
1661 | } |
1662 | |
1663 | bool isObjCMethodParameter() const { |
1664 | return ParmVarDeclBits.IsObjCMethodParam; |
1665 | } |
1666 | |
1667 | /// Determines whether this parameter is destroyed in the callee function. |
1668 | bool isDestroyedInCallee() const; |
1669 | |
1670 | unsigned getFunctionScopeDepth() const { |
1671 | if (ParmVarDeclBits.IsObjCMethodParam) return 0; |
1672 | return ParmVarDeclBits.ScopeDepthOrObjCQuals; |
1673 | } |
1674 | |
1675 | static constexpr unsigned getMaxFunctionScopeDepth() { |
1676 | return (1u << NumScopeDepthOrObjCQualsBits) - 1; |
1677 | } |
1678 | |
1679 | /// Returns the index of this parameter in its prototype or method scope. |
1680 | unsigned getFunctionScopeIndex() const { |
1681 | return getParameterIndex(); |
1682 | } |
1683 | |
1684 | ObjCDeclQualifier getObjCDeclQualifier() const { |
1685 | if (!ParmVarDeclBits.IsObjCMethodParam) return OBJC_TQ_None; |
1686 | return ObjCDeclQualifier(ParmVarDeclBits.ScopeDepthOrObjCQuals); |
1687 | } |
1688 | void setObjCDeclQualifier(ObjCDeclQualifier QTVal) { |
1689 | assert(ParmVarDeclBits.IsObjCMethodParam)((ParmVarDeclBits.IsObjCMethodParam) ? static_cast<void> (0) : __assert_fail ("ParmVarDeclBits.IsObjCMethodParam", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 1689, __PRETTY_FUNCTION__)); |
1690 | ParmVarDeclBits.ScopeDepthOrObjCQuals = QTVal; |
1691 | } |
1692 | |
1693 | /// True if the value passed to this parameter must undergo |
1694 | /// K&R-style default argument promotion: |
1695 | /// |
1696 | /// C99 6.5.2.2. |
1697 | /// If the expression that denotes the called function has a type |
1698 | /// that does not include a prototype, the integer promotions are |
1699 | /// performed on each argument, and arguments that have type float |
1700 | /// are promoted to double. |
1701 | bool isKNRPromoted() const { |
1702 | return ParmVarDeclBits.IsKNRPromoted; |
1703 | } |
1704 | void setKNRPromoted(bool promoted) { |
1705 | ParmVarDeclBits.IsKNRPromoted = promoted; |
1706 | } |
1707 | |
1708 | Expr *getDefaultArg(); |
1709 | const Expr *getDefaultArg() const { |
1710 | return const_cast<ParmVarDecl *>(this)->getDefaultArg(); |
1711 | } |
1712 | |
1713 | void setDefaultArg(Expr *defarg); |
1714 | |
1715 | /// Retrieve the source range that covers the entire default |
1716 | /// argument. |
1717 | SourceRange getDefaultArgRange() const; |
1718 | void setUninstantiatedDefaultArg(Expr *arg); |
1719 | Expr *getUninstantiatedDefaultArg(); |
1720 | const Expr *getUninstantiatedDefaultArg() const { |
1721 | return const_cast<ParmVarDecl *>(this)->getUninstantiatedDefaultArg(); |
1722 | } |
1723 | |
1724 | /// Determines whether this parameter has a default argument, |
1725 | /// either parsed or not. |
1726 | bool hasDefaultArg() const; |
1727 | |
1728 | /// Determines whether this parameter has a default argument that has not |
1729 | /// yet been parsed. This will occur during the processing of a C++ class |
1730 | /// whose member functions have default arguments, e.g., |
1731 | /// @code |
1732 | /// class X { |
1733 | /// public: |
1734 | /// void f(int x = 17); // x has an unparsed default argument now |
1735 | /// }; // x has a regular default argument now |
1736 | /// @endcode |
1737 | bool hasUnparsedDefaultArg() const { |
1738 | return ParmVarDeclBits.DefaultArgKind == DAK_Unparsed; |
1739 | } |
1740 | |
1741 | bool hasUninstantiatedDefaultArg() const { |
1742 | return ParmVarDeclBits.DefaultArgKind == DAK_Uninstantiated; |
1743 | } |
1744 | |
1745 | /// Specify that this parameter has an unparsed default argument. |
1746 | /// The argument will be replaced with a real default argument via |
1747 | /// setDefaultArg when the class definition enclosing the function |
1748 | /// declaration that owns this default argument is completed. |
1749 | void setUnparsedDefaultArg() { |
1750 | ParmVarDeclBits.DefaultArgKind = DAK_Unparsed; |
1751 | } |
1752 | |
1753 | bool hasInheritedDefaultArg() const { |
1754 | return ParmVarDeclBits.HasInheritedDefaultArg; |
1755 | } |
1756 | |
1757 | void setHasInheritedDefaultArg(bool I = true) { |
1758 | ParmVarDeclBits.HasInheritedDefaultArg = I; |
1759 | } |
1760 | |
1761 | QualType getOriginalType() const; |
1762 | |
1763 | /// Sets the function declaration that owns this |
1764 | /// ParmVarDecl. Since ParmVarDecls are often created before the |
1765 | /// FunctionDecls that own them, this routine is required to update |
1766 | /// the DeclContext appropriately. |
1767 | void setOwningFunction(DeclContext *FD) { setDeclContext(FD); } |
1768 | |
1769 | // Implement isa/cast/dyncast/etc. |
1770 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
1771 | static bool classofKind(Kind K) { return K == ParmVar; } |
1772 | |
1773 | private: |
1774 | enum { ParameterIndexSentinel = (1 << NumParameterIndexBits) - 1 }; |
1775 | |
1776 | void setParameterIndex(unsigned parameterIndex) { |
1777 | if (parameterIndex >= ParameterIndexSentinel) { |
1778 | setParameterIndexLarge(parameterIndex); |
1779 | return; |
1780 | } |
1781 | |
1782 | ParmVarDeclBits.ParameterIndex = parameterIndex; |
1783 | assert(ParmVarDeclBits.ParameterIndex == parameterIndex && "truncation!")((ParmVarDeclBits.ParameterIndex == parameterIndex && "truncation!") ? static_cast<void> (0) : __assert_fail ("ParmVarDeclBits.ParameterIndex == parameterIndex && \"truncation!\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 1783, __PRETTY_FUNCTION__)); |
1784 | } |
1785 | unsigned getParameterIndex() const { |
1786 | unsigned d = ParmVarDeclBits.ParameterIndex; |
1787 | return d == ParameterIndexSentinel ? getParameterIndexLarge() : d; |
1788 | } |
1789 | |
1790 | void setParameterIndexLarge(unsigned parameterIndex); |
1791 | unsigned getParameterIndexLarge() const; |
1792 | }; |
1793 | |
1794 | enum class MultiVersionKind { |
1795 | None, |
1796 | Target, |
1797 | CPUSpecific, |
1798 | CPUDispatch |
1799 | }; |
1800 | |
1801 | /// Represents a function declaration or definition. |
1802 | /// |
1803 | /// Since a given function can be declared several times in a program, |
1804 | /// there may be several FunctionDecls that correspond to that |
1805 | /// function. Only one of those FunctionDecls will be found when |
1806 | /// traversing the list of declarations in the context of the |
1807 | /// FunctionDecl (e.g., the translation unit); this FunctionDecl |
1808 | /// contains all of the information known about the function. Other, |
1809 | /// previous declarations of the function are available via the |
1810 | /// getPreviousDecl() chain. |
1811 | class FunctionDecl : public DeclaratorDecl, |
1812 | public DeclContext, |
1813 | public Redeclarable<FunctionDecl> { |
1814 | // This class stores some data in DeclContext::FunctionDeclBits |
1815 | // to save some space. Use the provided accessors to access it. |
1816 | public: |
1817 | /// The kind of templated function a FunctionDecl can be. |
1818 | enum TemplatedKind { |
1819 | // Not templated. |
1820 | TK_NonTemplate, |
1821 | // The pattern in a function template declaration. |
1822 | TK_FunctionTemplate, |
1823 | // A non-template function that is an instantiation or explicit |
1824 | // specialization of a member of a templated class. |
1825 | TK_MemberSpecialization, |
1826 | // An instantiation or explicit specialization of a function template. |
1827 | // Note: this might have been instantiated from a templated class if it |
1828 | // is a class-scope explicit specialization. |
1829 | TK_FunctionTemplateSpecialization, |
1830 | // A function template specialization that hasn't yet been resolved to a |
1831 | // particular specialized function template. |
1832 | TK_DependentFunctionTemplateSpecialization |
1833 | }; |
1834 | |
1835 | /// Stashed information about a defaulted function definition whose body has |
1836 | /// not yet been lazily generated. |
1837 | class DefaultedFunctionInfo final |
1838 | : llvm::TrailingObjects<DefaultedFunctionInfo, DeclAccessPair> { |
1839 | friend TrailingObjects; |
1840 | unsigned NumLookups; |
1841 | |
1842 | public: |
1843 | static DefaultedFunctionInfo *Create(ASTContext &Context, |
1844 | ArrayRef<DeclAccessPair> Lookups); |
1845 | /// Get the unqualified lookup results that should be used in this |
1846 | /// defaulted function definition. |
1847 | ArrayRef<DeclAccessPair> getUnqualifiedLookups() const { |
1848 | return {getTrailingObjects<DeclAccessPair>(), NumLookups}; |
1849 | } |
1850 | }; |
1851 | |
1852 | private: |
1853 | /// A new[]'d array of pointers to VarDecls for the formal |
1854 | /// parameters of this function. This is null if a prototype or if there are |
1855 | /// no formals. |
1856 | ParmVarDecl **ParamInfo = nullptr; |
1857 | |
1858 | /// The active member of this union is determined by |
1859 | /// FunctionDeclBits.HasDefaultedFunctionInfo. |
1860 | union { |
1861 | /// The body of the function. |
1862 | LazyDeclStmtPtr Body; |
1863 | /// Information about a future defaulted function definition. |
1864 | DefaultedFunctionInfo *DefaultedInfo; |
1865 | }; |
1866 | |
1867 | unsigned ODRHash; |
1868 | |
1869 | /// End part of this FunctionDecl's source range. |
1870 | /// |
1871 | /// We could compute the full range in getSourceRange(). However, when we're |
1872 | /// dealing with a function definition deserialized from a PCH/AST file, |
1873 | /// we can only compute the full range once the function body has been |
1874 | /// de-serialized, so it's far better to have the (sometimes-redundant) |
1875 | /// EndRangeLoc. |
1876 | SourceLocation EndRangeLoc; |
1877 | |
1878 | /// The template or declaration that this declaration |
1879 | /// describes or was instantiated from, respectively. |
1880 | /// |
1881 | /// For non-templates, this value will be NULL. For function |
1882 | /// declarations that describe a function template, this will be a |
1883 | /// pointer to a FunctionTemplateDecl. For member functions |
1884 | /// of class template specializations, this will be a MemberSpecializationInfo |
1885 | /// pointer containing information about the specialization. |
1886 | /// For function template specializations, this will be a |
1887 | /// FunctionTemplateSpecializationInfo, which contains information about |
1888 | /// the template being specialized and the template arguments involved in |
1889 | /// that specialization. |
1890 | llvm::PointerUnion<FunctionTemplateDecl *, |
1891 | MemberSpecializationInfo *, |
1892 | FunctionTemplateSpecializationInfo *, |
1893 | DependentFunctionTemplateSpecializationInfo *> |
1894 | TemplateOrSpecialization; |
1895 | |
1896 | /// Provides source/type location info for the declaration name embedded in |
1897 | /// the DeclaratorDecl base class. |
1898 | DeclarationNameLoc DNLoc; |
1899 | |
1900 | /// Specify that this function declaration is actually a function |
1901 | /// template specialization. |
1902 | /// |
1903 | /// \param C the ASTContext. |
1904 | /// |
1905 | /// \param Template the function template that this function template |
1906 | /// specialization specializes. |
1907 | /// |
1908 | /// \param TemplateArgs the template arguments that produced this |
1909 | /// function template specialization from the template. |
1910 | /// |
1911 | /// \param InsertPos If non-NULL, the position in the function template |
1912 | /// specialization set where the function template specialization data will |
1913 | /// be inserted. |
1914 | /// |
1915 | /// \param TSK the kind of template specialization this is. |
1916 | /// |
1917 | /// \param TemplateArgsAsWritten location info of template arguments. |
1918 | /// |
1919 | /// \param PointOfInstantiation point at which the function template |
1920 | /// specialization was first instantiated. |
1921 | void setFunctionTemplateSpecialization(ASTContext &C, |
1922 | FunctionTemplateDecl *Template, |
1923 | const TemplateArgumentList *TemplateArgs, |
1924 | void *InsertPos, |
1925 | TemplateSpecializationKind TSK, |
1926 | const TemplateArgumentListInfo *TemplateArgsAsWritten, |
1927 | SourceLocation PointOfInstantiation); |
1928 | |
1929 | /// Specify that this record is an instantiation of the |
1930 | /// member function FD. |
1931 | void setInstantiationOfMemberFunction(ASTContext &C, FunctionDecl *FD, |
1932 | TemplateSpecializationKind TSK); |
1933 | |
1934 | void setParams(ASTContext &C, ArrayRef<ParmVarDecl *> NewParamInfo); |
1935 | |
1936 | // This is unfortunately needed because ASTDeclWriter::VisitFunctionDecl |
1937 | // need to access this bit but we want to avoid making ASTDeclWriter |
1938 | // a friend of FunctionDeclBitfields just for this. |
1939 | bool isDeletedBit() const { return FunctionDeclBits.IsDeleted; } |
1940 | |
1941 | /// Whether an ODRHash has been stored. |
1942 | bool hasODRHash() const { return FunctionDeclBits.HasODRHash; } |
1943 | |
1944 | /// State that an ODRHash has been stored. |
1945 | void setHasODRHash(bool B = true) { FunctionDeclBits.HasODRHash = B; } |
1946 | |
1947 | protected: |
1948 | FunctionDecl(Kind DK, ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
1949 | const DeclarationNameInfo &NameInfo, QualType T, |
1950 | TypeSourceInfo *TInfo, StorageClass S, bool isInlineSpecified, |
1951 | ConstexprSpecKind ConstexprKind, |
1952 | Expr *TrailingRequiresClause = nullptr); |
1953 | |
1954 | using redeclarable_base = Redeclarable<FunctionDecl>; |
1955 | |
1956 | FunctionDecl *getNextRedeclarationImpl() override { |
1957 | return getNextRedeclaration(); |
1958 | } |
1959 | |
1960 | FunctionDecl *getPreviousDeclImpl() override { |
1961 | return getPreviousDecl(); |
1962 | } |
1963 | |
1964 | FunctionDecl *getMostRecentDeclImpl() override { |
1965 | return getMostRecentDecl(); |
1966 | } |
1967 | |
1968 | public: |
1969 | friend class ASTDeclReader; |
1970 | friend class ASTDeclWriter; |
1971 | |
1972 | using redecl_range = redeclarable_base::redecl_range; |
1973 | using redecl_iterator = redeclarable_base::redecl_iterator; |
1974 | |
1975 | using redeclarable_base::redecls_begin; |
1976 | using redeclarable_base::redecls_end; |
1977 | using redeclarable_base::redecls; |
1978 | using redeclarable_base::getPreviousDecl; |
1979 | using redeclarable_base::getMostRecentDecl; |
1980 | using redeclarable_base::isFirstDecl; |
1981 | |
1982 | static FunctionDecl * |
1983 | Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
1984 | SourceLocation NLoc, DeclarationName N, QualType T, |
1985 | TypeSourceInfo *TInfo, StorageClass SC, bool isInlineSpecified = false, |
1986 | bool hasWrittenPrototype = true, |
1987 | ConstexprSpecKind ConstexprKind = ConstexprSpecKind::Unspecified, |
1988 | Expr *TrailingRequiresClause = nullptr) { |
1989 | DeclarationNameInfo NameInfo(N, NLoc); |
1990 | return FunctionDecl::Create(C, DC, StartLoc, NameInfo, T, TInfo, SC, |
1991 | isInlineSpecified, hasWrittenPrototype, |
1992 | ConstexprKind, TrailingRequiresClause); |
1993 | } |
1994 | |
1995 | static FunctionDecl *Create(ASTContext &C, DeclContext *DC, |
1996 | SourceLocation StartLoc, |
1997 | const DeclarationNameInfo &NameInfo, QualType T, |
1998 | TypeSourceInfo *TInfo, StorageClass SC, |
1999 | bool isInlineSpecified, bool hasWrittenPrototype, |
2000 | ConstexprSpecKind ConstexprKind, |
2001 | Expr *TrailingRequiresClause); |
2002 | |
2003 | static FunctionDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
2004 | |
2005 | DeclarationNameInfo getNameInfo() const { |
2006 | return DeclarationNameInfo(getDeclName(), getLocation(), DNLoc); |
2007 | } |
2008 | |
2009 | void getNameForDiagnostic(raw_ostream &OS, const PrintingPolicy &Policy, |
2010 | bool Qualified) const override; |
2011 | |
2012 | void setRangeEnd(SourceLocation E) { EndRangeLoc = E; } |
2013 | |
2014 | /// Returns the location of the ellipsis of a variadic function. |
2015 | SourceLocation getEllipsisLoc() const { |
2016 | const auto *FPT = getType()->getAs<FunctionProtoType>(); |
2017 | if (FPT && FPT->isVariadic()) |
2018 | return FPT->getEllipsisLoc(); |
2019 | return SourceLocation(); |
2020 | } |
2021 | |
2022 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
2023 | |
2024 | // Function definitions. |
2025 | // |
2026 | // A function declaration may be: |
2027 | // - a non defining declaration, |
2028 | // - a definition. A function may be defined because: |
2029 | // - it has a body, or will have it in the case of late parsing. |
2030 | // - it has an uninstantiated body. The body does not exist because the |
2031 | // function is not used yet, but the declaration is considered a |
2032 | // definition and does not allow other definition of this function. |
2033 | // - it does not have a user specified body, but it does not allow |
2034 | // redefinition, because it is deleted/defaulted or is defined through |
2035 | // some other mechanism (alias, ifunc). |
2036 | |
2037 | /// Returns true if the function has a body. |
2038 | /// |
2039 | /// The function body might be in any of the (re-)declarations of this |
2040 | /// function. The variant that accepts a FunctionDecl pointer will set that |
2041 | /// function declaration to the actual declaration containing the body (if |
2042 | /// there is one). |
2043 | bool hasBody(const FunctionDecl *&Definition) const; |
2044 | |
2045 | bool hasBody() const override { |
2046 | const FunctionDecl* Definition; |
2047 | return hasBody(Definition); |
2048 | } |
2049 | |
2050 | /// Returns whether the function has a trivial body that does not require any |
2051 | /// specific codegen. |
2052 | bool hasTrivialBody() const; |
2053 | |
2054 | /// Returns true if the function has a definition that does not need to be |
2055 | /// instantiated. |
2056 | /// |
2057 | /// The variant that accepts a FunctionDecl pointer will set that function |
2058 | /// declaration to the declaration that is a definition (if there is one). |
2059 | /// |
2060 | /// \param CheckForPendingFriendDefinition If \c true, also check for friend |
2061 | /// declarations that were instantiataed from function definitions. |
2062 | /// Such a declaration behaves as if it is a definition for the |
2063 | /// purpose of redefinition checking, but isn't actually a "real" |
2064 | /// definition until its body is instantiated. |
2065 | bool isDefined(const FunctionDecl *&Definition, |
2066 | bool CheckForPendingFriendDefinition = false) const; |
2067 | |
2068 | bool isDefined() const { |
2069 | const FunctionDecl* Definition; |
2070 | return isDefined(Definition); |
2071 | } |
2072 | |
2073 | /// Get the definition for this declaration. |
2074 | FunctionDecl *getDefinition() { |
2075 | const FunctionDecl *Definition; |
2076 | if (isDefined(Definition)) |
2077 | return const_cast<FunctionDecl *>(Definition); |
2078 | return nullptr; |
2079 | } |
2080 | const FunctionDecl *getDefinition() const { |
2081 | return const_cast<FunctionDecl *>(this)->getDefinition(); |
2082 | } |
2083 | |
2084 | /// Retrieve the body (definition) of the function. The function body might be |
2085 | /// in any of the (re-)declarations of this function. The variant that accepts |
2086 | /// a FunctionDecl pointer will set that function declaration to the actual |
2087 | /// declaration containing the body (if there is one). |
2088 | /// NOTE: For checking if there is a body, use hasBody() instead, to avoid |
2089 | /// unnecessary AST de-serialization of the body. |
2090 | Stmt *getBody(const FunctionDecl *&Definition) const; |
2091 | |
2092 | Stmt *getBody() const override { |
2093 | const FunctionDecl* Definition; |
2094 | return getBody(Definition); |
2095 | } |
2096 | |
2097 | /// Returns whether this specific declaration of the function is also a |
2098 | /// definition that does not contain uninstantiated body. |
2099 | /// |
2100 | /// This does not determine whether the function has been defined (e.g., in a |
2101 | /// previous definition); for that information, use isDefined. |
2102 | /// |
2103 | /// Note: the function declaration does not become a definition until the |
2104 | /// parser reaches the definition, if called before, this function will return |
2105 | /// `false`. |
2106 | bool isThisDeclarationADefinition() const { |
2107 | return isDeletedAsWritten() || isDefaulted() || |
2108 | doesThisDeclarationHaveABody() || hasSkippedBody() || |
2109 | willHaveBody() || hasDefiningAttr(); |
2110 | } |
2111 | |
2112 | /// Determine whether this specific declaration of the function is a friend |
2113 | /// declaration that was instantiated from a function definition. Such |
2114 | /// declarations behave like definitions in some contexts. |
2115 | bool isThisDeclarationInstantiatedFromAFriendDefinition() const; |
2116 | |
2117 | /// Returns whether this specific declaration of the function has a body. |
2118 | bool doesThisDeclarationHaveABody() const { |
2119 | return (!FunctionDeclBits.HasDefaultedFunctionInfo && Body) || |
2120 | isLateTemplateParsed(); |
2121 | } |
2122 | |
2123 | void setBody(Stmt *B); |
2124 | void setLazyBody(uint64_t Offset) { |
2125 | FunctionDeclBits.HasDefaultedFunctionInfo = false; |
2126 | Body = LazyDeclStmtPtr(Offset); |
2127 | } |
2128 | |
2129 | void setDefaultedFunctionInfo(DefaultedFunctionInfo *Info); |
2130 | DefaultedFunctionInfo *getDefaultedFunctionInfo() const; |
2131 | |
2132 | /// Whether this function is variadic. |
2133 | bool isVariadic() const; |
2134 | |
2135 | /// Whether this function is marked as virtual explicitly. |
2136 | bool isVirtualAsWritten() const { |
2137 | return FunctionDeclBits.IsVirtualAsWritten; |
2138 | } |
2139 | |
2140 | /// State that this function is marked as virtual explicitly. |
2141 | void setVirtualAsWritten(bool V) { FunctionDeclBits.IsVirtualAsWritten = V; } |
2142 | |
2143 | /// Whether this virtual function is pure, i.e. makes the containing class |
2144 | /// abstract. |
2145 | bool isPure() const { return FunctionDeclBits.IsPure; } |
2146 | void setPure(bool P = true); |
2147 | |
2148 | /// Whether this templated function will be late parsed. |
2149 | bool isLateTemplateParsed() const { |
2150 | return FunctionDeclBits.IsLateTemplateParsed; |
2151 | } |
2152 | |
2153 | /// State that this templated function will be late parsed. |
2154 | void setLateTemplateParsed(bool ILT = true) { |
2155 | FunctionDeclBits.IsLateTemplateParsed = ILT; |
2156 | } |
2157 | |
2158 | /// Whether this function is "trivial" in some specialized C++ senses. |
2159 | /// Can only be true for default constructors, copy constructors, |
2160 | /// copy assignment operators, and destructors. Not meaningful until |
2161 | /// the class has been fully built by Sema. |
2162 | bool isTrivial() const { return FunctionDeclBits.IsTrivial; } |
2163 | void setTrivial(bool IT) { FunctionDeclBits.IsTrivial = IT; } |
2164 | |
2165 | bool isTrivialForCall() const { return FunctionDeclBits.IsTrivialForCall; } |
2166 | void setTrivialForCall(bool IT) { FunctionDeclBits.IsTrivialForCall = IT; } |
2167 | |
2168 | /// Whether this function is defaulted. Valid for e.g. |
2169 | /// special member functions, defaulted comparisions (not methods!). |
2170 | bool isDefaulted() const { return FunctionDeclBits.IsDefaulted; } |
2171 | void setDefaulted(bool D = true) { FunctionDeclBits.IsDefaulted = D; } |
2172 | |
2173 | /// Whether this function is explicitly defaulted. |
2174 | bool isExplicitlyDefaulted() const { |
2175 | return FunctionDeclBits.IsExplicitlyDefaulted; |
2176 | } |
2177 | |
2178 | /// State that this function is explicitly defaulted. |
2179 | void setExplicitlyDefaulted(bool ED = true) { |
2180 | FunctionDeclBits.IsExplicitlyDefaulted = ED; |
2181 | } |
2182 | |
2183 | /// True if this method is user-declared and was not |
2184 | /// deleted or defaulted on its first declaration. |
2185 | bool isUserProvided() const { |
2186 | auto *DeclAsWritten = this; |
2187 | if (FunctionDecl *Pattern = getTemplateInstantiationPattern()) |
2188 | DeclAsWritten = Pattern; |
2189 | return !(DeclAsWritten->isDeleted() || |
2190 | DeclAsWritten->getCanonicalDecl()->isDefaulted()); |
2191 | } |
2192 | |
2193 | /// Whether falling off this function implicitly returns null/zero. |
2194 | /// If a more specific implicit return value is required, front-ends |
2195 | /// should synthesize the appropriate return statements. |
2196 | bool hasImplicitReturnZero() const { |
2197 | return FunctionDeclBits.HasImplicitReturnZero; |
2198 | } |
2199 | |
2200 | /// State that falling off this function implicitly returns null/zero. |
2201 | /// If a more specific implicit return value is required, front-ends |
2202 | /// should synthesize the appropriate return statements. |
2203 | void setHasImplicitReturnZero(bool IRZ) { |
2204 | FunctionDeclBits.HasImplicitReturnZero = IRZ; |
2205 | } |
2206 | |
2207 | /// Whether this function has a prototype, either because one |
2208 | /// was explicitly written or because it was "inherited" by merging |
2209 | /// a declaration without a prototype with a declaration that has a |
2210 | /// prototype. |
2211 | bool hasPrototype() const { |
2212 | return hasWrittenPrototype() || hasInheritedPrototype(); |
2213 | } |
2214 | |
2215 | /// Whether this function has a written prototype. |
2216 | bool hasWrittenPrototype() const { |
2217 | return FunctionDeclBits.HasWrittenPrototype; |
2218 | } |
2219 | |
2220 | /// State that this function has a written prototype. |
2221 | void setHasWrittenPrototype(bool P = true) { |
2222 | FunctionDeclBits.HasWrittenPrototype = P; |
2223 | } |
2224 | |
2225 | /// Whether this function inherited its prototype from a |
2226 | /// previous declaration. |
2227 | bool hasInheritedPrototype() const { |
2228 | return FunctionDeclBits.HasInheritedPrototype; |
2229 | } |
2230 | |
2231 | /// State that this function inherited its prototype from a |
2232 | /// previous declaration. |
2233 | void setHasInheritedPrototype(bool P = true) { |
2234 | FunctionDeclBits.HasInheritedPrototype = P; |
2235 | } |
2236 | |
2237 | /// Whether this is a (C++11) constexpr function or constexpr constructor. |
2238 | bool isConstexpr() const { |
2239 | return getConstexprKind() != ConstexprSpecKind::Unspecified; |
2240 | } |
2241 | void setConstexprKind(ConstexprSpecKind CSK) { |
2242 | FunctionDeclBits.ConstexprKind = static_cast<uint64_t>(CSK); |
2243 | } |
2244 | ConstexprSpecKind getConstexprKind() const { |
2245 | return static_cast<ConstexprSpecKind>(FunctionDeclBits.ConstexprKind); |
2246 | } |
2247 | bool isConstexprSpecified() const { |
2248 | return getConstexprKind() == ConstexprSpecKind::Constexpr; |
2249 | } |
2250 | bool isConsteval() const { |
2251 | return getConstexprKind() == ConstexprSpecKind::Consteval; |
2252 | } |
2253 | |
2254 | /// Whether the instantiation of this function is pending. |
2255 | /// This bit is set when the decision to instantiate this function is made |
2256 | /// and unset if and when the function body is created. That leaves out |
2257 | /// cases where instantiation did not happen because the template definition |
2258 | /// was not seen in this TU. This bit remains set in those cases, under the |
2259 | /// assumption that the instantiation will happen in some other TU. |
2260 | bool instantiationIsPending() const { |
2261 | return FunctionDeclBits.InstantiationIsPending; |
2262 | } |
2263 | |
2264 | /// State that the instantiation of this function is pending. |
2265 | /// (see instantiationIsPending) |
2266 | void setInstantiationIsPending(bool IC) { |
2267 | FunctionDeclBits.InstantiationIsPending = IC; |
2268 | } |
2269 | |
2270 | /// Indicates the function uses __try. |
2271 | bool usesSEHTry() const { return FunctionDeclBits.UsesSEHTry; } |
2272 | void setUsesSEHTry(bool UST) { FunctionDeclBits.UsesSEHTry = UST; } |
2273 | |
2274 | /// Whether this function has been deleted. |
2275 | /// |
2276 | /// A function that is "deleted" (via the C++0x "= delete" syntax) |
2277 | /// acts like a normal function, except that it cannot actually be |
2278 | /// called or have its address taken. Deleted functions are |
2279 | /// typically used in C++ overload resolution to attract arguments |
2280 | /// whose type or lvalue/rvalue-ness would permit the use of a |
2281 | /// different overload that would behave incorrectly. For example, |
2282 | /// one might use deleted functions to ban implicit conversion from |
2283 | /// a floating-point number to an Integer type: |
2284 | /// |
2285 | /// @code |
2286 | /// struct Integer { |
2287 | /// Integer(long); // construct from a long |
2288 | /// Integer(double) = delete; // no construction from float or double |
2289 | /// Integer(long double) = delete; // no construction from long double |
2290 | /// }; |
2291 | /// @endcode |
2292 | // If a function is deleted, its first declaration must be. |
2293 | bool isDeleted() const { |
2294 | return getCanonicalDecl()->FunctionDeclBits.IsDeleted; |
2295 | } |
2296 | |
2297 | bool isDeletedAsWritten() const { |
2298 | return FunctionDeclBits.IsDeleted && !isDefaulted(); |
2299 | } |
2300 | |
2301 | void setDeletedAsWritten(bool D = true) { FunctionDeclBits.IsDeleted = D; } |
2302 | |
2303 | /// Determines whether this function is "main", which is the |
2304 | /// entry point into an executable program. |
2305 | bool isMain() const; |
2306 | |
2307 | /// Determines whether this function is a MSVCRT user defined entry |
2308 | /// point. |
2309 | bool isMSVCRTEntryPoint() const; |
2310 | |
2311 | /// Determines whether this operator new or delete is one |
2312 | /// of the reserved global placement operators: |
2313 | /// void *operator new(size_t, void *); |
2314 | /// void *operator new[](size_t, void *); |
2315 | /// void operator delete(void *, void *); |
2316 | /// void operator delete[](void *, void *); |
2317 | /// These functions have special behavior under [new.delete.placement]: |
2318 | /// These functions are reserved, a C++ program may not define |
2319 | /// functions that displace the versions in the Standard C++ library. |
2320 | /// The provisions of [basic.stc.dynamic] do not apply to these |
2321 | /// reserved placement forms of operator new and operator delete. |
2322 | /// |
2323 | /// This function must be an allocation or deallocation function. |
2324 | bool isReservedGlobalPlacementOperator() const; |
2325 | |
2326 | /// Determines whether this function is one of the replaceable |
2327 | /// global allocation functions: |
2328 | /// void *operator new(size_t); |
2329 | /// void *operator new(size_t, const std::nothrow_t &) noexcept; |
2330 | /// void *operator new[](size_t); |
2331 | /// void *operator new[](size_t, const std::nothrow_t &) noexcept; |
2332 | /// void operator delete(void *) noexcept; |
2333 | /// void operator delete(void *, std::size_t) noexcept; [C++1y] |
2334 | /// void operator delete(void *, const std::nothrow_t &) noexcept; |
2335 | /// void operator delete[](void *) noexcept; |
2336 | /// void operator delete[](void *, std::size_t) noexcept; [C++1y] |
2337 | /// void operator delete[](void *, const std::nothrow_t &) noexcept; |
2338 | /// These functions have special behavior under C++1y [expr.new]: |
2339 | /// An implementation is allowed to omit a call to a replaceable global |
2340 | /// allocation function. [...] |
2341 | /// |
2342 | /// If this function is an aligned allocation/deallocation function, return |
2343 | /// the parameter number of the requested alignment through AlignmentParam. |
2344 | /// |
2345 | /// If this function is an allocation/deallocation function that takes |
2346 | /// the `std::nothrow_t` tag, return true through IsNothrow, |
2347 | bool isReplaceableGlobalAllocationFunction( |
2348 | Optional<unsigned> *AlignmentParam = nullptr, |
2349 | bool *IsNothrow = nullptr) const; |
2350 | |
2351 | /// Determine if this function provides an inline implementation of a builtin. |
2352 | bool isInlineBuiltinDeclaration() const; |
2353 | |
2354 | /// Determine whether this is a destroying operator delete. |
2355 | bool isDestroyingOperatorDelete() const; |
2356 | |
2357 | /// Compute the language linkage. |
2358 | LanguageLinkage getLanguageLinkage() const; |
2359 | |
2360 | /// Determines whether this function is a function with |
2361 | /// external, C linkage. |
2362 | bool isExternC() const; |
2363 | |
2364 | /// Determines whether this function's context is, or is nested within, |
2365 | /// a C++ extern "C" linkage spec. |
2366 | bool isInExternCContext() const; |
2367 | |
2368 | /// Determines whether this function's context is, or is nested within, |
2369 | /// a C++ extern "C++" linkage spec. |
2370 | bool isInExternCXXContext() const; |
2371 | |
2372 | /// Determines whether this is a global function. |
2373 | bool isGlobal() const; |
2374 | |
2375 | /// Determines whether this function is known to be 'noreturn', through |
2376 | /// an attribute on its declaration or its type. |
2377 | bool isNoReturn() const; |
2378 | |
2379 | /// True if the function was a definition but its body was skipped. |
2380 | bool hasSkippedBody() const { return FunctionDeclBits.HasSkippedBody; } |
2381 | void setHasSkippedBody(bool Skipped = true) { |
2382 | FunctionDeclBits.HasSkippedBody = Skipped; |
2383 | } |
2384 | |
2385 | /// True if this function will eventually have a body, once it's fully parsed. |
2386 | bool willHaveBody() const { return FunctionDeclBits.WillHaveBody; } |
2387 | void setWillHaveBody(bool V = true) { FunctionDeclBits.WillHaveBody = V; } |
2388 | |
2389 | /// True if this function is considered a multiversioned function. |
2390 | bool isMultiVersion() const { |
2391 | return getCanonicalDecl()->FunctionDeclBits.IsMultiVersion; |
2392 | } |
2393 | |
2394 | /// Sets the multiversion state for this declaration and all of its |
2395 | /// redeclarations. |
2396 | void setIsMultiVersion(bool V = true) { |
2397 | getCanonicalDecl()->FunctionDeclBits.IsMultiVersion = V; |
2398 | } |
2399 | |
2400 | /// Gets the kind of multiversioning attribute this declaration has. Note that |
2401 | /// this can return a value even if the function is not multiversion, such as |
2402 | /// the case of 'target'. |
2403 | MultiVersionKind getMultiVersionKind() const; |
2404 | |
2405 | |
2406 | /// True if this function is a multiversioned dispatch function as a part of |
2407 | /// the cpu_specific/cpu_dispatch functionality. |
2408 | bool isCPUDispatchMultiVersion() const; |
2409 | /// True if this function is a multiversioned processor specific function as a |
2410 | /// part of the cpu_specific/cpu_dispatch functionality. |
2411 | bool isCPUSpecificMultiVersion() const; |
2412 | |
2413 | /// True if this function is a multiversioned dispatch function as a part of |
2414 | /// the target functionality. |
2415 | bool isTargetMultiVersion() const; |
2416 | |
2417 | /// \brief Get the associated-constraints of this function declaration. |
2418 | /// Currently, this will either be a vector of size 1 containing the |
2419 | /// trailing-requires-clause or an empty vector. |
2420 | /// |
2421 | /// Use this instead of getTrailingRequiresClause for concepts APIs that |
2422 | /// accept an ArrayRef of constraint expressions. |
2423 | void getAssociatedConstraints(SmallVectorImpl<const Expr *> &AC) const { |
2424 | if (auto *TRC = getTrailingRequiresClause()) |
2425 | AC.push_back(TRC); |
2426 | } |
2427 | |
2428 | void setPreviousDeclaration(FunctionDecl * PrevDecl); |
2429 | |
2430 | FunctionDecl *getCanonicalDecl() override; |
2431 | const FunctionDecl *getCanonicalDecl() const { |
2432 | return const_cast<FunctionDecl*>(this)->getCanonicalDecl(); |
2433 | } |
2434 | |
2435 | unsigned getBuiltinID(bool ConsiderWrapperFunctions = false) const; |
2436 | |
2437 | // ArrayRef interface to parameters. |
2438 | ArrayRef<ParmVarDecl *> parameters() const { |
2439 | return {ParamInfo, getNumParams()}; |
2440 | } |
2441 | MutableArrayRef<ParmVarDecl *> parameters() { |
2442 | return {ParamInfo, getNumParams()}; |
2443 | } |
2444 | |
2445 | // Iterator access to formal parameters. |
2446 | using param_iterator = MutableArrayRef<ParmVarDecl *>::iterator; |
2447 | using param_const_iterator = ArrayRef<ParmVarDecl *>::const_iterator; |
2448 | |
2449 | bool param_empty() const { return parameters().empty(); } |
2450 | param_iterator param_begin() { return parameters().begin(); } |
2451 | param_iterator param_end() { return parameters().end(); } |
2452 | param_const_iterator param_begin() const { return parameters().begin(); } |
2453 | param_const_iterator param_end() const { return parameters().end(); } |
2454 | size_t param_size() const { return parameters().size(); } |
2455 | |
2456 | /// Return the number of parameters this function must have based on its |
2457 | /// FunctionType. This is the length of the ParamInfo array after it has been |
2458 | /// created. |
2459 | unsigned getNumParams() const; |
2460 | |
2461 | const ParmVarDecl *getParamDecl(unsigned i) const { |
2462 | assert(i < getNumParams() && "Illegal param #")((i < getNumParams() && "Illegal param #") ? static_cast <void> (0) : __assert_fail ("i < getNumParams() && \"Illegal param #\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 2462, __PRETTY_FUNCTION__)); |
2463 | return ParamInfo[i]; |
2464 | } |
2465 | ParmVarDecl *getParamDecl(unsigned i) { |
2466 | assert(i < getNumParams() && "Illegal param #")((i < getNumParams() && "Illegal param #") ? static_cast <void> (0) : __assert_fail ("i < getNumParams() && \"Illegal param #\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 2466, __PRETTY_FUNCTION__)); |
2467 | return ParamInfo[i]; |
2468 | } |
2469 | void setParams(ArrayRef<ParmVarDecl *> NewParamInfo) { |
2470 | setParams(getASTContext(), NewParamInfo); |
2471 | } |
2472 | |
2473 | /// Returns the minimum number of arguments needed to call this function. This |
2474 | /// may be fewer than the number of function parameters, if some of the |
2475 | /// parameters have default arguments (in C++). |
2476 | unsigned getMinRequiredArguments() const; |
2477 | |
2478 | /// Determine whether this function has a single parameter, or multiple |
2479 | /// parameters where all but the first have default arguments. |
2480 | /// |
2481 | /// This notion is used in the definition of copy/move constructors and |
2482 | /// initializer list constructors. Note that, unlike getMinRequiredArguments, |
2483 | /// parameter packs are not treated specially here. |
2484 | bool hasOneParamOrDefaultArgs() const; |
2485 | |
2486 | /// Find the source location information for how the type of this function |
2487 | /// was written. May be absent (for example if the function was declared via |
2488 | /// a typedef) and may contain a different type from that of the function |
2489 | /// (for example if the function type was adjusted by an attribute). |
2490 | FunctionTypeLoc getFunctionTypeLoc() const; |
2491 | |
2492 | QualType getReturnType() const { |
2493 | return getType()->castAs<FunctionType>()->getReturnType(); |
2494 | } |
2495 | |
2496 | /// Attempt to compute an informative source range covering the |
2497 | /// function return type. This may omit qualifiers and other information with |
2498 | /// limited representation in the AST. |
2499 | SourceRange getReturnTypeSourceRange() const; |
2500 | |
2501 | /// Attempt to compute an informative source range covering the |
2502 | /// function parameters, including the ellipsis of a variadic function. |
2503 | /// The source range excludes the parentheses, and is invalid if there are |
2504 | /// no parameters and no ellipsis. |
2505 | SourceRange getParametersSourceRange() const; |
2506 | |
2507 | /// Get the declared return type, which may differ from the actual return |
2508 | /// type if the return type is deduced. |
2509 | QualType getDeclaredReturnType() const { |
2510 | auto *TSI = getTypeSourceInfo(); |
2511 | QualType T = TSI ? TSI->getType() : getType(); |
2512 | return T->castAs<FunctionType>()->getReturnType(); |
2513 | } |
2514 | |
2515 | /// Gets the ExceptionSpecificationType as declared. |
2516 | ExceptionSpecificationType getExceptionSpecType() const { |
2517 | auto *TSI = getTypeSourceInfo(); |
2518 | QualType T = TSI ? TSI->getType() : getType(); |
2519 | const auto *FPT = T->getAs<FunctionProtoType>(); |
2520 | return FPT ? FPT->getExceptionSpecType() : EST_None; |
2521 | } |
2522 | |
2523 | /// Attempt to compute an informative source range covering the |
2524 | /// function exception specification, if any. |
2525 | SourceRange getExceptionSpecSourceRange() const; |
2526 | |
2527 | /// Determine the type of an expression that calls this function. |
2528 | QualType getCallResultType() const { |
2529 | return getType()->castAs<FunctionType>()->getCallResultType( |
2530 | getASTContext()); |
2531 | } |
2532 | |
2533 | /// Returns the storage class as written in the source. For the |
2534 | /// computed linkage of symbol, see getLinkage. |
2535 | StorageClass getStorageClass() const { |
2536 | return static_cast<StorageClass>(FunctionDeclBits.SClass); |
2537 | } |
2538 | |
2539 | /// Sets the storage class as written in the source. |
2540 | void setStorageClass(StorageClass SClass) { |
2541 | FunctionDeclBits.SClass = SClass; |
2542 | } |
2543 | |
2544 | /// Determine whether the "inline" keyword was specified for this |
2545 | /// function. |
2546 | bool isInlineSpecified() const { return FunctionDeclBits.IsInlineSpecified; } |
2547 | |
2548 | /// Set whether the "inline" keyword was specified for this function. |
2549 | void setInlineSpecified(bool I) { |
2550 | FunctionDeclBits.IsInlineSpecified = I; |
2551 | FunctionDeclBits.IsInline = I; |
2552 | } |
2553 | |
2554 | /// Flag that this function is implicitly inline. |
2555 | void setImplicitlyInline(bool I = true) { FunctionDeclBits.IsInline = I; } |
2556 | |
2557 | /// Determine whether this function should be inlined, because it is |
2558 | /// either marked "inline" or "constexpr" or is a member function of a class |
2559 | /// that was defined in the class body. |
2560 | bool isInlined() const { return FunctionDeclBits.IsInline; } |
2561 | |
2562 | bool isInlineDefinitionExternallyVisible() const; |
2563 | |
2564 | bool isMSExternInline() const; |
2565 | |
2566 | bool doesDeclarationForceExternallyVisibleDefinition() const; |
2567 | |
2568 | bool isStatic() const { return getStorageClass() == SC_Static; } |
2569 | |
2570 | /// Whether this function declaration represents an C++ overloaded |
2571 | /// operator, e.g., "operator+". |
2572 | bool isOverloadedOperator() const { |
2573 | return getOverloadedOperator() != OO_None; |
2574 | } |
2575 | |
2576 | OverloadedOperatorKind getOverloadedOperator() const; |
2577 | |
2578 | const IdentifierInfo *getLiteralIdentifier() const; |
2579 | |
2580 | /// If this function is an instantiation of a member function |
2581 | /// of a class template specialization, retrieves the function from |
2582 | /// which it was instantiated. |
2583 | /// |
2584 | /// This routine will return non-NULL for (non-templated) member |
2585 | /// functions of class templates and for instantiations of function |
2586 | /// templates. For example, given: |
2587 | /// |
2588 | /// \code |
2589 | /// template<typename T> |
2590 | /// struct X { |
2591 | /// void f(T); |
2592 | /// }; |
2593 | /// \endcode |
2594 | /// |
2595 | /// The declaration for X<int>::f is a (non-templated) FunctionDecl |
2596 | /// whose parent is the class template specialization X<int>. For |
2597 | /// this declaration, getInstantiatedFromFunction() will return |
2598 | /// the FunctionDecl X<T>::A. When a complete definition of |
2599 | /// X<int>::A is required, it will be instantiated from the |
2600 | /// declaration returned by getInstantiatedFromMemberFunction(). |
2601 | FunctionDecl *getInstantiatedFromMemberFunction() const; |
2602 | |
2603 | /// What kind of templated function this is. |
2604 | TemplatedKind getTemplatedKind() const; |
2605 | |
2606 | /// If this function is an instantiation of a member function of a |
2607 | /// class template specialization, retrieves the member specialization |
2608 | /// information. |
2609 | MemberSpecializationInfo *getMemberSpecializationInfo() const; |
2610 | |
2611 | /// Specify that this record is an instantiation of the |
2612 | /// member function FD. |
2613 | void setInstantiationOfMemberFunction(FunctionDecl *FD, |
2614 | TemplateSpecializationKind TSK) { |
2615 | setInstantiationOfMemberFunction(getASTContext(), FD, TSK); |
2616 | } |
2617 | |
2618 | /// Retrieves the function template that is described by this |
2619 | /// function declaration. |
2620 | /// |
2621 | /// Every function template is represented as a FunctionTemplateDecl |
2622 | /// and a FunctionDecl (or something derived from FunctionDecl). The |
2623 | /// former contains template properties (such as the template |
2624 | /// parameter lists) while the latter contains the actual |
2625 | /// description of the template's |
2626 | /// contents. FunctionTemplateDecl::getTemplatedDecl() retrieves the |
2627 | /// FunctionDecl that describes the function template, |
2628 | /// getDescribedFunctionTemplate() retrieves the |
2629 | /// FunctionTemplateDecl from a FunctionDecl. |
2630 | FunctionTemplateDecl *getDescribedFunctionTemplate() const; |
2631 | |
2632 | void setDescribedFunctionTemplate(FunctionTemplateDecl *Template); |
2633 | |
2634 | /// Determine whether this function is a function template |
2635 | /// specialization. |
2636 | bool isFunctionTemplateSpecialization() const { |
2637 | return getPrimaryTemplate() != nullptr; |
2638 | } |
2639 | |
2640 | /// If this function is actually a function template specialization, |
2641 | /// retrieve information about this function template specialization. |
2642 | /// Otherwise, returns NULL. |
2643 | FunctionTemplateSpecializationInfo *getTemplateSpecializationInfo() const; |
2644 | |
2645 | /// Determines whether this function is a function template |
2646 | /// specialization or a member of a class template specialization that can |
2647 | /// be implicitly instantiated. |
2648 | bool isImplicitlyInstantiable() const; |
2649 | |
2650 | /// Determines if the given function was instantiated from a |
2651 | /// function template. |
2652 | bool isTemplateInstantiation() const; |
2653 | |
2654 | /// Retrieve the function declaration from which this function could |
2655 | /// be instantiated, if it is an instantiation (rather than a non-template |
2656 | /// or a specialization, for example). |
2657 | /// |
2658 | /// If \p ForDefinition is \c false, explicit specializations will be treated |
2659 | /// as if they were implicit instantiations. This will then find the pattern |
2660 | /// corresponding to non-definition portions of the declaration, such as |
2661 | /// default arguments and the exception specification. |
2662 | FunctionDecl * |
2663 | getTemplateInstantiationPattern(bool ForDefinition = true) const; |
2664 | |
2665 | /// Retrieve the primary template that this function template |
2666 | /// specialization either specializes or was instantiated from. |
2667 | /// |
2668 | /// If this function declaration is not a function template specialization, |
2669 | /// returns NULL. |
2670 | FunctionTemplateDecl *getPrimaryTemplate() const; |
2671 | |
2672 | /// Retrieve the template arguments used to produce this function |
2673 | /// template specialization from the primary template. |
2674 | /// |
2675 | /// If this function declaration is not a function template specialization, |
2676 | /// returns NULL. |
2677 | const TemplateArgumentList *getTemplateSpecializationArgs() const; |
2678 | |
2679 | /// Retrieve the template argument list as written in the sources, |
2680 | /// if any. |
2681 | /// |
2682 | /// If this function declaration is not a function template specialization |
2683 | /// or if it had no explicit template argument list, returns NULL. |
2684 | /// Note that it an explicit template argument list may be written empty, |
2685 | /// e.g., template<> void foo<>(char* s); |
2686 | const ASTTemplateArgumentListInfo* |
2687 | getTemplateSpecializationArgsAsWritten() const; |
2688 | |
2689 | /// Specify that this function declaration is actually a function |
2690 | /// template specialization. |
2691 | /// |
2692 | /// \param Template the function template that this function template |
2693 | /// specialization specializes. |
2694 | /// |
2695 | /// \param TemplateArgs the template arguments that produced this |
2696 | /// function template specialization from the template. |
2697 | /// |
2698 | /// \param InsertPos If non-NULL, the position in the function template |
2699 | /// specialization set where the function template specialization data will |
2700 | /// be inserted. |
2701 | /// |
2702 | /// \param TSK the kind of template specialization this is. |
2703 | /// |
2704 | /// \param TemplateArgsAsWritten location info of template arguments. |
2705 | /// |
2706 | /// \param PointOfInstantiation point at which the function template |
2707 | /// specialization was first instantiated. |
2708 | void setFunctionTemplateSpecialization(FunctionTemplateDecl *Template, |
2709 | const TemplateArgumentList *TemplateArgs, |
2710 | void *InsertPos, |
2711 | TemplateSpecializationKind TSK = TSK_ImplicitInstantiation, |
2712 | const TemplateArgumentListInfo *TemplateArgsAsWritten = nullptr, |
2713 | SourceLocation PointOfInstantiation = SourceLocation()) { |
2714 | setFunctionTemplateSpecialization(getASTContext(), Template, TemplateArgs, |
2715 | InsertPos, TSK, TemplateArgsAsWritten, |
2716 | PointOfInstantiation); |
2717 | } |
2718 | |
2719 | /// Specifies that this function declaration is actually a |
2720 | /// dependent function template specialization. |
2721 | void setDependentTemplateSpecialization(ASTContext &Context, |
2722 | const UnresolvedSetImpl &Templates, |
2723 | const TemplateArgumentListInfo &TemplateArgs); |
2724 | |
2725 | DependentFunctionTemplateSpecializationInfo * |
2726 | getDependentSpecializationInfo() const; |
2727 | |
2728 | /// Determine what kind of template instantiation this function |
2729 | /// represents. |
2730 | TemplateSpecializationKind getTemplateSpecializationKind() const; |
2731 | |
2732 | /// Determine the kind of template specialization this function represents |
2733 | /// for the purpose of template instantiation. |
2734 | TemplateSpecializationKind |
2735 | getTemplateSpecializationKindForInstantiation() const; |
2736 | |
2737 | /// Determine what kind of template instantiation this function |
2738 | /// represents. |
2739 | void setTemplateSpecializationKind(TemplateSpecializationKind TSK, |
2740 | SourceLocation PointOfInstantiation = SourceLocation()); |
2741 | |
2742 | /// Retrieve the (first) point of instantiation of a function template |
2743 | /// specialization or a member of a class template specialization. |
2744 | /// |
2745 | /// \returns the first point of instantiation, if this function was |
2746 | /// instantiated from a template; otherwise, returns an invalid source |
2747 | /// location. |
2748 | SourceLocation getPointOfInstantiation() const; |
2749 | |
2750 | /// Determine whether this is or was instantiated from an out-of-line |
2751 | /// definition of a member function. |
2752 | bool isOutOfLine() const override; |
2753 | |
2754 | /// Identify a memory copying or setting function. |
2755 | /// If the given function is a memory copy or setting function, returns |
2756 | /// the corresponding Builtin ID. If the function is not a memory function, |
2757 | /// returns 0. |
2758 | unsigned getMemoryFunctionKind() const; |
2759 | |
2760 | /// Returns ODRHash of the function. This value is calculated and |
2761 | /// stored on first call, then the stored value returned on the other calls. |
2762 | unsigned getODRHash(); |
2763 | |
2764 | /// Returns cached ODRHash of the function. This must have been previously |
2765 | /// computed and stored. |
2766 | unsigned getODRHash() const; |
2767 | |
2768 | // Implement isa/cast/dyncast/etc. |
2769 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
2770 | static bool classofKind(Kind K) { |
2771 | return K >= firstFunction && K <= lastFunction; |
2772 | } |
2773 | static DeclContext *castToDeclContext(const FunctionDecl *D) { |
2774 | return static_cast<DeclContext *>(const_cast<FunctionDecl*>(D)); |
2775 | } |
2776 | static FunctionDecl *castFromDeclContext(const DeclContext *DC) { |
2777 | return static_cast<FunctionDecl *>(const_cast<DeclContext*>(DC)); |
2778 | } |
2779 | }; |
2780 | |
2781 | /// Represents a member of a struct/union/class. |
2782 | class FieldDecl : public DeclaratorDecl, public Mergeable<FieldDecl> { |
2783 | unsigned BitField : 1; |
2784 | unsigned Mutable : 1; |
2785 | mutable unsigned CachedFieldIndex : 30; |
2786 | |
2787 | /// The kinds of value we can store in InitializerOrBitWidth. |
2788 | /// |
2789 | /// Note that this is compatible with InClassInitStyle except for |
2790 | /// ISK_CapturedVLAType. |
2791 | enum InitStorageKind { |
2792 | /// If the pointer is null, there's nothing special. Otherwise, |
2793 | /// this is a bitfield and the pointer is the Expr* storing the |
2794 | /// bit-width. |
2795 | ISK_NoInit = (unsigned) ICIS_NoInit, |
2796 | |
2797 | /// The pointer is an (optional due to delayed parsing) Expr* |
2798 | /// holding the copy-initializer. |
2799 | ISK_InClassCopyInit = (unsigned) ICIS_CopyInit, |
2800 | |
2801 | /// The pointer is an (optional due to delayed parsing) Expr* |
2802 | /// holding the list-initializer. |
2803 | ISK_InClassListInit = (unsigned) ICIS_ListInit, |
2804 | |
2805 | /// The pointer is a VariableArrayType* that's been captured; |
2806 | /// the enclosing context is a lambda or captured statement. |
2807 | ISK_CapturedVLAType, |
2808 | }; |
2809 | |
2810 | /// If this is a bitfield with a default member initializer, this |
2811 | /// structure is used to represent the two expressions. |
2812 | struct InitAndBitWidth { |
2813 | Expr *Init; |
2814 | Expr *BitWidth; |
2815 | }; |
2816 | |
2817 | /// Storage for either the bit-width, the in-class initializer, or |
2818 | /// both (via InitAndBitWidth), or the captured variable length array bound. |
2819 | /// |
2820 | /// If the storage kind is ISK_InClassCopyInit or |
2821 | /// ISK_InClassListInit, but the initializer is null, then this |
2822 | /// field has an in-class initializer that has not yet been parsed |
2823 | /// and attached. |
2824 | // FIXME: Tail-allocate this to reduce the size of FieldDecl in the |
2825 | // overwhelmingly common case that we have none of these things. |
2826 | llvm::PointerIntPair<void *, 2, InitStorageKind> InitStorage; |
2827 | |
2828 | protected: |
2829 | FieldDecl(Kind DK, DeclContext *DC, SourceLocation StartLoc, |
2830 | SourceLocation IdLoc, IdentifierInfo *Id, |
2831 | QualType T, TypeSourceInfo *TInfo, Expr *BW, bool Mutable, |
2832 | InClassInitStyle InitStyle) |
2833 | : DeclaratorDecl(DK, DC, IdLoc, Id, T, TInfo, StartLoc), |
2834 | BitField(false), Mutable(Mutable), CachedFieldIndex(0), |
2835 | InitStorage(nullptr, (InitStorageKind) InitStyle) { |
2836 | if (BW) |
2837 | setBitWidth(BW); |
2838 | } |
2839 | |
2840 | public: |
2841 | friend class ASTDeclReader; |
2842 | friend class ASTDeclWriter; |
2843 | |
2844 | static FieldDecl *Create(const ASTContext &C, DeclContext *DC, |
2845 | SourceLocation StartLoc, SourceLocation IdLoc, |
2846 | IdentifierInfo *Id, QualType T, |
2847 | TypeSourceInfo *TInfo, Expr *BW, bool Mutable, |
2848 | InClassInitStyle InitStyle); |
2849 | |
2850 | static FieldDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
2851 | |
2852 | /// Returns the index of this field within its record, |
2853 | /// as appropriate for passing to ASTRecordLayout::getFieldOffset. |
2854 | unsigned getFieldIndex() const; |
2855 | |
2856 | /// Determines whether this field is mutable (C++ only). |
2857 | bool isMutable() const { return Mutable; } |
2858 | |
2859 | /// Determines whether this field is a bitfield. |
2860 | bool isBitField() const { return BitField; } |
2861 | |
2862 | /// Determines whether this is an unnamed bitfield. |
2863 | bool isUnnamedBitfield() const { return isBitField() && !getDeclName(); } |
2864 | |
2865 | /// Determines whether this field is a |
2866 | /// representative for an anonymous struct or union. Such fields are |
2867 | /// unnamed and are implicitly generated by the implementation to |
2868 | /// store the data for the anonymous union or struct. |
2869 | bool isAnonymousStructOrUnion() const; |
2870 | |
2871 | Expr *getBitWidth() const { |
2872 | if (!BitField) |
2873 | return nullptr; |
2874 | void *Ptr = InitStorage.getPointer(); |
2875 | if (getInClassInitStyle()) |
2876 | return static_cast<InitAndBitWidth*>(Ptr)->BitWidth; |
2877 | return static_cast<Expr*>(Ptr); |
2878 | } |
2879 | |
2880 | unsigned getBitWidthValue(const ASTContext &Ctx) const; |
2881 | |
2882 | /// Set the bit-field width for this member. |
2883 | // Note: used by some clients (i.e., do not remove it). |
2884 | void setBitWidth(Expr *Width) { |
2885 | assert(!hasCapturedVLAType() && !BitField &&((!hasCapturedVLAType() && !BitField && "bit width or captured type already set" ) ? static_cast<void> (0) : __assert_fail ("!hasCapturedVLAType() && !BitField && \"bit width or captured type already set\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 2886, __PRETTY_FUNCTION__)) |
2886 | "bit width or captured type already set")((!hasCapturedVLAType() && !BitField && "bit width or captured type already set" ) ? static_cast<void> (0) : __assert_fail ("!hasCapturedVLAType() && !BitField && \"bit width or captured type already set\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 2886, __PRETTY_FUNCTION__)); |
2887 | assert(Width && "no bit width specified")((Width && "no bit width specified") ? static_cast< void> (0) : __assert_fail ("Width && \"no bit width specified\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 2887, __PRETTY_FUNCTION__)); |
2888 | InitStorage.setPointer( |
2889 | InitStorage.getInt() |
2890 | ? new (getASTContext()) |
2891 | InitAndBitWidth{getInClassInitializer(), Width} |
2892 | : static_cast<void*>(Width)); |
2893 | BitField = true; |
2894 | } |
2895 | |
2896 | /// Remove the bit-field width from this member. |
2897 | // Note: used by some clients (i.e., do not remove it). |
2898 | void removeBitWidth() { |
2899 | assert(isBitField() && "no bitfield width to remove")((isBitField() && "no bitfield width to remove") ? static_cast <void> (0) : __assert_fail ("isBitField() && \"no bitfield width to remove\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 2899, __PRETTY_FUNCTION__)); |
2900 | InitStorage.setPointer(getInClassInitializer()); |
2901 | BitField = false; |
2902 | } |
2903 | |
2904 | /// Is this a zero-length bit-field? Such bit-fields aren't really bit-fields |
2905 | /// at all and instead act as a separator between contiguous runs of other |
2906 | /// bit-fields. |
2907 | bool isZeroLengthBitField(const ASTContext &Ctx) const; |
2908 | |
2909 | /// Determine if this field is a subobject of zero size, that is, either a |
2910 | /// zero-length bit-field or a field of empty class type with the |
2911 | /// [[no_unique_address]] attribute. |
2912 | bool isZeroSize(const ASTContext &Ctx) const; |
2913 | |
2914 | /// Get the kind of (C++11) default member initializer that this field has. |
2915 | InClassInitStyle getInClassInitStyle() const { |
2916 | InitStorageKind storageKind = InitStorage.getInt(); |
2917 | return (storageKind == ISK_CapturedVLAType |
2918 | ? ICIS_NoInit : (InClassInitStyle) storageKind); |
2919 | } |
2920 | |
2921 | /// Determine whether this member has a C++11 default member initializer. |
2922 | bool hasInClassInitializer() const { |
2923 | return getInClassInitStyle() != ICIS_NoInit; |
2924 | } |
2925 | |
2926 | /// Get the C++11 default member initializer for this member, or null if one |
2927 | /// has not been set. If a valid declaration has a default member initializer, |
2928 | /// but this returns null, then we have not parsed and attached it yet. |
2929 | Expr *getInClassInitializer() const { |
2930 | if (!hasInClassInitializer()) |
2931 | return nullptr; |
2932 | void *Ptr = InitStorage.getPointer(); |
2933 | if (BitField) |
2934 | return static_cast<InitAndBitWidth*>(Ptr)->Init; |
2935 | return static_cast<Expr*>(Ptr); |
2936 | } |
2937 | |
2938 | /// Set the C++11 in-class initializer for this member. |
2939 | void setInClassInitializer(Expr *Init) { |
2940 | assert(hasInClassInitializer() && !getInClassInitializer())((hasInClassInitializer() && !getInClassInitializer() ) ? static_cast<void> (0) : __assert_fail ("hasInClassInitializer() && !getInClassInitializer()" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 2940, __PRETTY_FUNCTION__)); |
2941 | if (BitField) |
2942 | static_cast<InitAndBitWidth*>(InitStorage.getPointer())->Init = Init; |
2943 | else |
2944 | InitStorage.setPointer(Init); |
2945 | } |
2946 | |
2947 | /// Remove the C++11 in-class initializer from this member. |
2948 | void removeInClassInitializer() { |
2949 | assert(hasInClassInitializer() && "no initializer to remove")((hasInClassInitializer() && "no initializer to remove" ) ? static_cast<void> (0) : __assert_fail ("hasInClassInitializer() && \"no initializer to remove\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 2949, __PRETTY_FUNCTION__)); |
2950 | InitStorage.setPointerAndInt(getBitWidth(), ISK_NoInit); |
2951 | } |
2952 | |
2953 | /// Determine whether this member captures the variable length array |
2954 | /// type. |
2955 | bool hasCapturedVLAType() const { |
2956 | return InitStorage.getInt() == ISK_CapturedVLAType; |
2957 | } |
2958 | |
2959 | /// Get the captured variable length array type. |
2960 | const VariableArrayType *getCapturedVLAType() const { |
2961 | return hasCapturedVLAType() ? static_cast<const VariableArrayType *>( |
2962 | InitStorage.getPointer()) |
2963 | : nullptr; |
2964 | } |
2965 | |
2966 | /// Set the captured variable length array type for this field. |
2967 | void setCapturedVLAType(const VariableArrayType *VLAType); |
2968 | |
2969 | /// Returns the parent of this field declaration, which |
2970 | /// is the struct in which this field is defined. |
2971 | /// |
2972 | /// Returns null if this is not a normal class/struct field declaration, e.g. |
2973 | /// ObjCAtDefsFieldDecl, ObjCIvarDecl. |
2974 | const RecordDecl *getParent() const { |
2975 | return dyn_cast<RecordDecl>(getDeclContext()); |
2976 | } |
2977 | |
2978 | RecordDecl *getParent() { |
2979 | return dyn_cast<RecordDecl>(getDeclContext()); |
2980 | } |
2981 | |
2982 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
2983 | |
2984 | /// Retrieves the canonical declaration of this field. |
2985 | FieldDecl *getCanonicalDecl() override { return getFirstDecl(); } |
2986 | const FieldDecl *getCanonicalDecl() const { return getFirstDecl(); } |
2987 | |
2988 | // Implement isa/cast/dyncast/etc. |
2989 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
2990 | static bool classofKind(Kind K) { return K >= firstField && K <= lastField; } |
2991 | }; |
2992 | |
2993 | /// An instance of this object exists for each enum constant |
2994 | /// that is defined. For example, in "enum X {a,b}", each of a/b are |
2995 | /// EnumConstantDecl's, X is an instance of EnumDecl, and the type of a/b is a |
2996 | /// TagType for the X EnumDecl. |
2997 | class EnumConstantDecl : public ValueDecl, public Mergeable<EnumConstantDecl> { |
2998 | Stmt *Init; // an integer constant expression |
2999 | llvm::APSInt Val; // The value. |
3000 | |
3001 | protected: |
3002 | EnumConstantDecl(DeclContext *DC, SourceLocation L, |
3003 | IdentifierInfo *Id, QualType T, Expr *E, |
3004 | const llvm::APSInt &V) |
3005 | : ValueDecl(EnumConstant, DC, L, Id, T), Init((Stmt*)E), Val(V) {} |
3006 | |
3007 | public: |
3008 | friend class StmtIteratorBase; |
3009 | |
3010 | static EnumConstantDecl *Create(ASTContext &C, EnumDecl *DC, |
3011 | SourceLocation L, IdentifierInfo *Id, |
3012 | QualType T, Expr *E, |
3013 | const llvm::APSInt &V); |
3014 | static EnumConstantDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
3015 | |
3016 | const Expr *getInitExpr() const { return (const Expr*) Init; } |
3017 | Expr *getInitExpr() { return (Expr*) Init; } |
3018 | const llvm::APSInt &getInitVal() const { return Val; } |
3019 | |
3020 | void setInitExpr(Expr *E) { Init = (Stmt*) E; } |
3021 | void setInitVal(const llvm::APSInt &V) { Val = V; } |
3022 | |
3023 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
3024 | |
3025 | /// Retrieves the canonical declaration of this enumerator. |
3026 | EnumConstantDecl *getCanonicalDecl() override { return getFirstDecl(); } |
3027 | const EnumConstantDecl *getCanonicalDecl() const { return getFirstDecl(); } |
3028 | |
3029 | // Implement isa/cast/dyncast/etc. |
3030 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3031 | static bool classofKind(Kind K) { return K == EnumConstant; } |
3032 | }; |
3033 | |
3034 | /// Represents a field injected from an anonymous union/struct into the parent |
3035 | /// scope. These are always implicit. |
3036 | class IndirectFieldDecl : public ValueDecl, |
3037 | public Mergeable<IndirectFieldDecl> { |
3038 | NamedDecl **Chaining; |
3039 | unsigned ChainingSize; |
3040 | |
3041 | IndirectFieldDecl(ASTContext &C, DeclContext *DC, SourceLocation L, |
3042 | DeclarationName N, QualType T, |
3043 | MutableArrayRef<NamedDecl *> CH); |
3044 | |
3045 | void anchor() override; |
3046 | |
3047 | public: |
3048 | friend class ASTDeclReader; |
3049 | |
3050 | static IndirectFieldDecl *Create(ASTContext &C, DeclContext *DC, |
3051 | SourceLocation L, IdentifierInfo *Id, |
3052 | QualType T, llvm::MutableArrayRef<NamedDecl *> CH); |
3053 | |
3054 | static IndirectFieldDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
3055 | |
3056 | using chain_iterator = ArrayRef<NamedDecl *>::const_iterator; |
3057 | |
3058 | ArrayRef<NamedDecl *> chain() const { |
3059 | return llvm::makeArrayRef(Chaining, ChainingSize); |
3060 | } |
3061 | chain_iterator chain_begin() const { return chain().begin(); } |
3062 | chain_iterator chain_end() const { return chain().end(); } |
3063 | |
3064 | unsigned getChainingSize() const { return ChainingSize; } |
3065 | |
3066 | FieldDecl *getAnonField() const { |
3067 | assert(chain().size() >= 2)((chain().size() >= 2) ? static_cast<void> (0) : __assert_fail ("chain().size() >= 2", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 3067, __PRETTY_FUNCTION__)); |
3068 | return cast<FieldDecl>(chain().back()); |
3069 | } |
3070 | |
3071 | VarDecl *getVarDecl() const { |
3072 | assert(chain().size() >= 2)((chain().size() >= 2) ? static_cast<void> (0) : __assert_fail ("chain().size() >= 2", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 3072, __PRETTY_FUNCTION__)); |
3073 | return dyn_cast<VarDecl>(chain().front()); |
3074 | } |
3075 | |
3076 | IndirectFieldDecl *getCanonicalDecl() override { return getFirstDecl(); } |
3077 | const IndirectFieldDecl *getCanonicalDecl() const { return getFirstDecl(); } |
3078 | |
3079 | // Implement isa/cast/dyncast/etc. |
3080 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3081 | static bool classofKind(Kind K) { return K == IndirectField; } |
3082 | }; |
3083 | |
3084 | /// Represents a declaration of a type. |
3085 | class TypeDecl : public NamedDecl { |
3086 | friend class ASTContext; |
3087 | |
3088 | /// This indicates the Type object that represents |
3089 | /// this TypeDecl. It is a cache maintained by |
3090 | /// ASTContext::getTypedefType, ASTContext::getTagDeclType, and |
3091 | /// ASTContext::getTemplateTypeParmType, and TemplateTypeParmDecl. |
3092 | mutable const Type *TypeForDecl = nullptr; |
3093 | |
3094 | /// The start of the source range for this declaration. |
3095 | SourceLocation LocStart; |
3096 | |
3097 | void anchor() override; |
3098 | |
3099 | protected: |
3100 | TypeDecl(Kind DK, DeclContext *DC, SourceLocation L, IdentifierInfo *Id, |
3101 | SourceLocation StartL = SourceLocation()) |
3102 | : NamedDecl(DK, DC, L, Id), LocStart(StartL) {} |
3103 | |
3104 | public: |
3105 | // Low-level accessor. If you just want the type defined by this node, |
3106 | // check out ASTContext::getTypeDeclType or one of |
3107 | // ASTContext::getTypedefType, ASTContext::getRecordType, etc. if you |
3108 | // already know the specific kind of node this is. |
3109 | const Type *getTypeForDecl() const { return TypeForDecl; } |
3110 | void setTypeForDecl(const Type *TD) { TypeForDecl = TD; } |
3111 | |
3112 | SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return LocStart; } |
3113 | void setLocStart(SourceLocation L) { LocStart = L; } |
3114 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) { |
3115 | if (LocStart.isValid()) |
3116 | return SourceRange(LocStart, getLocation()); |
3117 | else |
3118 | return SourceRange(getLocation()); |
3119 | } |
3120 | |
3121 | // Implement isa/cast/dyncast/etc. |
3122 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3123 | static bool classofKind(Kind K) { return K >= firstType && K <= lastType; } |
3124 | }; |
3125 | |
3126 | /// Base class for declarations which introduce a typedef-name. |
3127 | class TypedefNameDecl : public TypeDecl, public Redeclarable<TypedefNameDecl> { |
3128 | struct alignas(8) ModedTInfo { |
3129 | TypeSourceInfo *first; |
3130 | QualType second; |
3131 | }; |
3132 | |
3133 | /// If int part is 0, we have not computed IsTransparentTag. |
3134 | /// Otherwise, IsTransparentTag is (getInt() >> 1). |
3135 | mutable llvm::PointerIntPair< |
3136 | llvm::PointerUnion<TypeSourceInfo *, ModedTInfo *>, 2> |
3137 | MaybeModedTInfo; |
3138 | |
3139 | void anchor() override; |
3140 | |
3141 | protected: |
3142 | TypedefNameDecl(Kind DK, ASTContext &C, DeclContext *DC, |
3143 | SourceLocation StartLoc, SourceLocation IdLoc, |
3144 | IdentifierInfo *Id, TypeSourceInfo *TInfo) |
3145 | : TypeDecl(DK, DC, IdLoc, Id, StartLoc), redeclarable_base(C), |
3146 | MaybeModedTInfo(TInfo, 0) {} |
3147 | |
3148 | using redeclarable_base = Redeclarable<TypedefNameDecl>; |
3149 | |
3150 | TypedefNameDecl *getNextRedeclarationImpl() override { |
3151 | return getNextRedeclaration(); |
3152 | } |
3153 | |
3154 | TypedefNameDecl *getPreviousDeclImpl() override { |
3155 | return getPreviousDecl(); |
3156 | } |
3157 | |
3158 | TypedefNameDecl *getMostRecentDeclImpl() override { |
3159 | return getMostRecentDecl(); |
3160 | } |
3161 | |
3162 | public: |
3163 | using redecl_range = redeclarable_base::redecl_range; |
3164 | using redecl_iterator = redeclarable_base::redecl_iterator; |
3165 | |
3166 | using redeclarable_base::redecls_begin; |
3167 | using redeclarable_base::redecls_end; |
3168 | using redeclarable_base::redecls; |
3169 | using redeclarable_base::getPreviousDecl; |
3170 | using redeclarable_base::getMostRecentDecl; |
3171 | using redeclarable_base::isFirstDecl; |
3172 | |
3173 | bool isModed() const { |
3174 | return MaybeModedTInfo.getPointer().is<ModedTInfo *>(); |
3175 | } |
3176 | |
3177 | TypeSourceInfo *getTypeSourceInfo() const { |
3178 | return isModed() ? MaybeModedTInfo.getPointer().get<ModedTInfo *>()->first |
3179 | : MaybeModedTInfo.getPointer().get<TypeSourceInfo *>(); |
3180 | } |
3181 | |
3182 | QualType getUnderlyingType() const { |
3183 | return isModed() ? MaybeModedTInfo.getPointer().get<ModedTInfo *>()->second |
3184 | : MaybeModedTInfo.getPointer() |
3185 | .get<TypeSourceInfo *>() |
3186 | ->getType(); |
3187 | } |
3188 | |
3189 | void setTypeSourceInfo(TypeSourceInfo *newType) { |
3190 | MaybeModedTInfo.setPointer(newType); |
3191 | } |
3192 | |
3193 | void setModedTypeSourceInfo(TypeSourceInfo *unmodedTSI, QualType modedTy) { |
3194 | MaybeModedTInfo.setPointer(new (getASTContext(), 8) |
3195 | ModedTInfo({unmodedTSI, modedTy})); |
3196 | } |
3197 | |
3198 | /// Retrieves the canonical declaration of this typedef-name. |
3199 | TypedefNameDecl *getCanonicalDecl() override { return getFirstDecl(); } |
3200 | const TypedefNameDecl *getCanonicalDecl() const { return getFirstDecl(); } |
3201 | |
3202 | /// Retrieves the tag declaration for which this is the typedef name for |
3203 | /// linkage purposes, if any. |
3204 | /// |
3205 | /// \param AnyRedecl Look for the tag declaration in any redeclaration of |
3206 | /// this typedef declaration. |
3207 | TagDecl *getAnonDeclWithTypedefName(bool AnyRedecl = false) const; |
3208 | |
3209 | /// Determines if this typedef shares a name and spelling location with its |
3210 | /// underlying tag type, as is the case with the NS_ENUM macro. |
3211 | bool isTransparentTag() const { |
3212 | if (MaybeModedTInfo.getInt()) |
3213 | return MaybeModedTInfo.getInt() & 0x2; |
3214 | return isTransparentTagSlow(); |
3215 | } |
3216 | |
3217 | // Implement isa/cast/dyncast/etc. |
3218 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3219 | static bool classofKind(Kind K) { |
3220 | return K >= firstTypedefName && K <= lastTypedefName; |
3221 | } |
3222 | |
3223 | private: |
3224 | bool isTransparentTagSlow() const; |
3225 | }; |
3226 | |
3227 | /// Represents the declaration of a typedef-name via the 'typedef' |
3228 | /// type specifier. |
3229 | class TypedefDecl : public TypedefNameDecl { |
3230 | TypedefDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
3231 | SourceLocation IdLoc, IdentifierInfo *Id, TypeSourceInfo *TInfo) |
3232 | : TypedefNameDecl(Typedef, C, DC, StartLoc, IdLoc, Id, TInfo) {} |
3233 | |
3234 | public: |
3235 | static TypedefDecl *Create(ASTContext &C, DeclContext *DC, |
3236 | SourceLocation StartLoc, SourceLocation IdLoc, |
3237 | IdentifierInfo *Id, TypeSourceInfo *TInfo); |
3238 | static TypedefDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
3239 | |
3240 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
3241 | |
3242 | // Implement isa/cast/dyncast/etc. |
3243 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3244 | static bool classofKind(Kind K) { return K == Typedef; } |
3245 | }; |
3246 | |
3247 | /// Represents the declaration of a typedef-name via a C++11 |
3248 | /// alias-declaration. |
3249 | class TypeAliasDecl : public TypedefNameDecl { |
3250 | /// The template for which this is the pattern, if any. |
3251 | TypeAliasTemplateDecl *Template; |
3252 | |
3253 | TypeAliasDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
3254 | SourceLocation IdLoc, IdentifierInfo *Id, TypeSourceInfo *TInfo) |
3255 | : TypedefNameDecl(TypeAlias, C, DC, StartLoc, IdLoc, Id, TInfo), |
3256 | Template(nullptr) {} |
3257 | |
3258 | public: |
3259 | static TypeAliasDecl *Create(ASTContext &C, DeclContext *DC, |
3260 | SourceLocation StartLoc, SourceLocation IdLoc, |
3261 | IdentifierInfo *Id, TypeSourceInfo *TInfo); |
3262 | static TypeAliasDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
3263 | |
3264 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
3265 | |
3266 | TypeAliasTemplateDecl *getDescribedAliasTemplate() const { return Template; } |
3267 | void setDescribedAliasTemplate(TypeAliasTemplateDecl *TAT) { Template = TAT; } |
3268 | |
3269 | // Implement isa/cast/dyncast/etc. |
3270 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3271 | static bool classofKind(Kind K) { return K == TypeAlias; } |
3272 | }; |
3273 | |
3274 | /// Represents the declaration of a struct/union/class/enum. |
3275 | class TagDecl : public TypeDecl, |
3276 | public DeclContext, |
3277 | public Redeclarable<TagDecl> { |
3278 | // This class stores some data in DeclContext::TagDeclBits |
3279 | // to save some space. Use the provided accessors to access it. |
3280 | public: |
3281 | // This is really ugly. |
3282 | using TagKind = TagTypeKind; |
3283 | |
3284 | private: |
3285 | SourceRange BraceRange; |
3286 | |
3287 | // A struct representing syntactic qualifier info, |
3288 | // to be used for the (uncommon) case of out-of-line declarations. |
3289 | using ExtInfo = QualifierInfo; |
3290 | |
3291 | /// If the (out-of-line) tag declaration name |
3292 | /// is qualified, it points to the qualifier info (nns and range); |
3293 | /// otherwise, if the tag declaration is anonymous and it is part of |
3294 | /// a typedef or alias, it points to the TypedefNameDecl (used for mangling); |
3295 | /// otherwise, if the tag declaration is anonymous and it is used as a |
3296 | /// declaration specifier for variables, it points to the first VarDecl (used |
3297 | /// for mangling); |
3298 | /// otherwise, it is a null (TypedefNameDecl) pointer. |
3299 | llvm::PointerUnion<TypedefNameDecl *, ExtInfo *> TypedefNameDeclOrQualifier; |
3300 | |
3301 | bool hasExtInfo() const { return TypedefNameDeclOrQualifier.is<ExtInfo *>(); } |
3302 | ExtInfo *getExtInfo() { return TypedefNameDeclOrQualifier.get<ExtInfo *>(); } |
3303 | const ExtInfo *getExtInfo() const { |
3304 | return TypedefNameDeclOrQualifier.get<ExtInfo *>(); |
3305 | } |
3306 | |
3307 | protected: |
3308 | TagDecl(Kind DK, TagKind TK, const ASTContext &C, DeclContext *DC, |
3309 | SourceLocation L, IdentifierInfo *Id, TagDecl *PrevDecl, |
3310 | SourceLocation StartL); |
3311 | |
3312 | using redeclarable_base = Redeclarable<TagDecl>; |
3313 | |
3314 | TagDecl *getNextRedeclarationImpl() override { |
3315 | return getNextRedeclaration(); |
3316 | } |
3317 | |
3318 | TagDecl *getPreviousDeclImpl() override { |
3319 | return getPreviousDecl(); |
3320 | } |
3321 | |
3322 | TagDecl *getMostRecentDeclImpl() override { |
3323 | return getMostRecentDecl(); |
3324 | } |
3325 | |
3326 | /// Completes the definition of this tag declaration. |
3327 | /// |
3328 | /// This is a helper function for derived classes. |
3329 | void completeDefinition(); |
3330 | |
3331 | /// True if this decl is currently being defined. |
3332 | void setBeingDefined(bool V = true) { TagDeclBits.IsBeingDefined = V; } |
3333 | |
3334 | /// Indicates whether it is possible for declarations of this kind |
3335 | /// to have an out-of-date definition. |
3336 | /// |
3337 | /// This option is only enabled when modules are enabled. |
3338 | void setMayHaveOutOfDateDef(bool V = true) { |
3339 | TagDeclBits.MayHaveOutOfDateDef = V; |
3340 | } |
3341 | |
3342 | public: |
3343 | friend class ASTDeclReader; |
3344 | friend class ASTDeclWriter; |
3345 | |
3346 | using redecl_range = redeclarable_base::redecl_range; |
3347 | using redecl_iterator = redeclarable_base::redecl_iterator; |
3348 | |
3349 | using redeclarable_base::redecls_begin; |
3350 | using redeclarable_base::redecls_end; |
3351 | using redeclarable_base::redecls; |
3352 | using redeclarable_base::getPreviousDecl; |
3353 | using redeclarable_base::getMostRecentDecl; |
3354 | using redeclarable_base::isFirstDecl; |
3355 | |
3356 | SourceRange getBraceRange() const { return BraceRange; } |
3357 | void setBraceRange(SourceRange R) { BraceRange = R; } |
3358 | |
3359 | /// Return SourceLocation representing start of source |
3360 | /// range ignoring outer template declarations. |
3361 | SourceLocation getInnerLocStart() const { return getBeginLoc(); } |
3362 | |
3363 | /// Return SourceLocation representing start of source |
3364 | /// range taking into account any outer template declarations. |
3365 | SourceLocation getOuterLocStart() const; |
3366 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
3367 | |
3368 | TagDecl *getCanonicalDecl() override; |
3369 | const TagDecl *getCanonicalDecl() const { |
3370 | return const_cast<TagDecl*>(this)->getCanonicalDecl(); |
3371 | } |
3372 | |
3373 | /// Return true if this declaration is a completion definition of the type. |
3374 | /// Provided for consistency. |
3375 | bool isThisDeclarationADefinition() const { |
3376 | return isCompleteDefinition(); |
3377 | } |
3378 | |
3379 | /// Return true if this decl has its body fully specified. |
3380 | bool isCompleteDefinition() const { return TagDeclBits.IsCompleteDefinition; } |
3381 | |
3382 | /// True if this decl has its body fully specified. |
3383 | void setCompleteDefinition(bool V = true) { |
3384 | TagDeclBits.IsCompleteDefinition = V; |
3385 | } |
3386 | |
3387 | /// Return true if this complete decl is |
3388 | /// required to be complete for some existing use. |
3389 | bool isCompleteDefinitionRequired() const { |
3390 | return TagDeclBits.IsCompleteDefinitionRequired; |
3391 | } |
3392 | |
3393 | /// True if this complete decl is |
3394 | /// required to be complete for some existing use. |
3395 | void setCompleteDefinitionRequired(bool V = true) { |
3396 | TagDeclBits.IsCompleteDefinitionRequired = V; |
3397 | } |
3398 | |
3399 | /// Return true if this decl is currently being defined. |
3400 | bool isBeingDefined() const { return TagDeclBits.IsBeingDefined; } |
3401 | |
3402 | /// True if this tag declaration is "embedded" (i.e., defined or declared |
3403 | /// for the very first time) in the syntax of a declarator. |
3404 | bool isEmbeddedInDeclarator() const { |
3405 | return TagDeclBits.IsEmbeddedInDeclarator; |
3406 | } |
3407 | |
3408 | /// True if this tag declaration is "embedded" (i.e., defined or declared |
3409 | /// for the very first time) in the syntax of a declarator. |
3410 | void setEmbeddedInDeclarator(bool isInDeclarator) { |
3411 | TagDeclBits.IsEmbeddedInDeclarator = isInDeclarator; |
3412 | } |
3413 | |
3414 | /// True if this tag is free standing, e.g. "struct foo;". |
3415 | bool isFreeStanding() const { return TagDeclBits.IsFreeStanding; } |
3416 | |
3417 | /// True if this tag is free standing, e.g. "struct foo;". |
3418 | void setFreeStanding(bool isFreeStanding = true) { |
3419 | TagDeclBits.IsFreeStanding = isFreeStanding; |
3420 | } |
3421 | |
3422 | /// Indicates whether it is possible for declarations of this kind |
3423 | /// to have an out-of-date definition. |
3424 | /// |
3425 | /// This option is only enabled when modules are enabled. |
3426 | bool mayHaveOutOfDateDef() const { return TagDeclBits.MayHaveOutOfDateDef; } |
3427 | |
3428 | /// Whether this declaration declares a type that is |
3429 | /// dependent, i.e., a type that somehow depends on template |
3430 | /// parameters. |
3431 | bool isDependentType() const { return isDependentContext(); } |
3432 | |
3433 | /// Starts the definition of this tag declaration. |
3434 | /// |
3435 | /// This method should be invoked at the beginning of the definition |
3436 | /// of this tag declaration. It will set the tag type into a state |
3437 | /// where it is in the process of being defined. |
3438 | void startDefinition(); |
3439 | |
3440 | /// Returns the TagDecl that actually defines this |
3441 | /// struct/union/class/enum. When determining whether or not a |
3442 | /// struct/union/class/enum has a definition, one should use this |
3443 | /// method as opposed to 'isDefinition'. 'isDefinition' indicates |
3444 | /// whether or not a specific TagDecl is defining declaration, not |
3445 | /// whether or not the struct/union/class/enum type is defined. |
3446 | /// This method returns NULL if there is no TagDecl that defines |
3447 | /// the struct/union/class/enum. |
3448 | TagDecl *getDefinition() const; |
3449 | |
3450 | StringRef getKindName() const { |
3451 | return TypeWithKeyword::getTagTypeKindName(getTagKind()); |
3452 | } |
3453 | |
3454 | TagKind getTagKind() const { |
3455 | return static_cast<TagKind>(TagDeclBits.TagDeclKind); |
3456 | } |
3457 | |
3458 | void setTagKind(TagKind TK) { TagDeclBits.TagDeclKind = TK; } |
3459 | |
3460 | bool isStruct() const { return getTagKind() == TTK_Struct; } |
3461 | bool isInterface() const { return getTagKind() == TTK_Interface; } |
3462 | bool isClass() const { return getTagKind() == TTK_Class; } |
3463 | bool isUnion() const { return getTagKind() == TTK_Union; } |
3464 | bool isEnum() const { return getTagKind() == TTK_Enum; } |
3465 | |
3466 | /// Is this tag type named, either directly or via being defined in |
3467 | /// a typedef of this type? |
3468 | /// |
3469 | /// C++11 [basic.link]p8: |
3470 | /// A type is said to have linkage if and only if: |
3471 | /// - it is a class or enumeration type that is named (or has a |
3472 | /// name for linkage purposes) and the name has linkage; ... |
3473 | /// C++11 [dcl.typedef]p9: |
3474 | /// If the typedef declaration defines an unnamed class (or enum), |
3475 | /// the first typedef-name declared by the declaration to be that |
3476 | /// class type (or enum type) is used to denote the class type (or |
3477 | /// enum type) for linkage purposes only. |
3478 | /// |
3479 | /// C does not have an analogous rule, but the same concept is |
3480 | /// nonetheless useful in some places. |
3481 | bool hasNameForLinkage() const { |
3482 | return (getDeclName() || getTypedefNameForAnonDecl()); |
3483 | } |
3484 | |
3485 | TypedefNameDecl *getTypedefNameForAnonDecl() const { |
3486 | return hasExtInfo() ? nullptr |
3487 | : TypedefNameDeclOrQualifier.get<TypedefNameDecl *>(); |
3488 | } |
3489 | |
3490 | void setTypedefNameForAnonDecl(TypedefNameDecl *TDD); |
3491 | |
3492 | /// Retrieve the nested-name-specifier that qualifies the name of this |
3493 | /// declaration, if it was present in the source. |
3494 | NestedNameSpecifier *getQualifier() const { |
3495 | return hasExtInfo() ? getExtInfo()->QualifierLoc.getNestedNameSpecifier() |
3496 | : nullptr; |
3497 | } |
3498 | |
3499 | /// Retrieve the nested-name-specifier (with source-location |
3500 | /// information) that qualifies the name of this declaration, if it was |
3501 | /// present in the source. |
3502 | NestedNameSpecifierLoc getQualifierLoc() const { |
3503 | return hasExtInfo() ? getExtInfo()->QualifierLoc |
3504 | : NestedNameSpecifierLoc(); |
3505 | } |
3506 | |
3507 | void setQualifierInfo(NestedNameSpecifierLoc QualifierLoc); |
3508 | |
3509 | unsigned getNumTemplateParameterLists() const { |
3510 | return hasExtInfo() ? getExtInfo()->NumTemplParamLists : 0; |
3511 | } |
3512 | |
3513 | TemplateParameterList *getTemplateParameterList(unsigned i) const { |
3514 | assert(i < getNumTemplateParameterLists())((i < getNumTemplateParameterLists()) ? static_cast<void > (0) : __assert_fail ("i < getNumTemplateParameterLists()" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 3514, __PRETTY_FUNCTION__)); |
3515 | return getExtInfo()->TemplParamLists[i]; |
3516 | } |
3517 | |
3518 | void setTemplateParameterListsInfo(ASTContext &Context, |
3519 | ArrayRef<TemplateParameterList *> TPLists); |
3520 | |
3521 | // Implement isa/cast/dyncast/etc. |
3522 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3523 | static bool classofKind(Kind K) { return K >= firstTag && K <= lastTag; } |
3524 | |
3525 | static DeclContext *castToDeclContext(const TagDecl *D) { |
3526 | return static_cast<DeclContext *>(const_cast<TagDecl*>(D)); |
3527 | } |
3528 | |
3529 | static TagDecl *castFromDeclContext(const DeclContext *DC) { |
3530 | return static_cast<TagDecl *>(const_cast<DeclContext*>(DC)); |
3531 | } |
3532 | }; |
3533 | |
3534 | /// Represents an enum. In C++11, enums can be forward-declared |
3535 | /// with a fixed underlying type, and in C we allow them to be forward-declared |
3536 | /// with no underlying type as an extension. |
3537 | class EnumDecl : public TagDecl { |
3538 | // This class stores some data in DeclContext::EnumDeclBits |
3539 | // to save some space. Use the provided accessors to access it. |
3540 | |
3541 | /// This represent the integer type that the enum corresponds |
3542 | /// to for code generation purposes. Note that the enumerator constants may |
3543 | /// have a different type than this does. |
3544 | /// |
3545 | /// If the underlying integer type was explicitly stated in the source |
3546 | /// code, this is a TypeSourceInfo* for that type. Otherwise this type |
3547 | /// was automatically deduced somehow, and this is a Type*. |
3548 | /// |
3549 | /// Normally if IsFixed(), this would contain a TypeSourceInfo*, but in |
3550 | /// some cases it won't. |
3551 | /// |
3552 | /// The underlying type of an enumeration never has any qualifiers, so |
3553 | /// we can get away with just storing a raw Type*, and thus save an |
3554 | /// extra pointer when TypeSourceInfo is needed. |
3555 | llvm::PointerUnion<const Type *, TypeSourceInfo *> IntegerType; |
3556 | |
3557 | /// The integer type that values of this type should |
3558 | /// promote to. In C, enumerators are generally of an integer type |
3559 | /// directly, but gcc-style large enumerators (and all enumerators |
3560 | /// in C++) are of the enum type instead. |
3561 | QualType PromotionType; |
3562 | |
3563 | /// If this enumeration is an instantiation of a member enumeration |
3564 | /// of a class template specialization, this is the member specialization |
3565 | /// information. |
3566 | MemberSpecializationInfo *SpecializationInfo = nullptr; |
3567 | |
3568 | /// Store the ODRHash after first calculation. |
3569 | /// The corresponding flag HasODRHash is in EnumDeclBits |
3570 | /// and can be accessed with the provided accessors. |
3571 | unsigned ODRHash; |
3572 | |
3573 | EnumDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
3574 | SourceLocation IdLoc, IdentifierInfo *Id, EnumDecl *PrevDecl, |
3575 | bool Scoped, bool ScopedUsingClassTag, bool Fixed); |
3576 | |
3577 | void anchor() override; |
3578 | |
3579 | void setInstantiationOfMemberEnum(ASTContext &C, EnumDecl *ED, |
3580 | TemplateSpecializationKind TSK); |
3581 | |
3582 | /// Sets the width in bits required to store all the |
3583 | /// non-negative enumerators of this enum. |
3584 | void setNumPositiveBits(unsigned Num) { |
3585 | EnumDeclBits.NumPositiveBits = Num; |
3586 | assert(EnumDeclBits.NumPositiveBits == Num && "can't store this bitcount")((EnumDeclBits.NumPositiveBits == Num && "can't store this bitcount" ) ? static_cast<void> (0) : __assert_fail ("EnumDeclBits.NumPositiveBits == Num && \"can't store this bitcount\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 3586, __PRETTY_FUNCTION__)); |
3587 | } |
3588 | |
3589 | /// Returns the width in bits required to store all the |
3590 | /// negative enumerators of this enum. (see getNumNegativeBits) |
3591 | void setNumNegativeBits(unsigned Num) { EnumDeclBits.NumNegativeBits = Num; } |
3592 | |
3593 | public: |
3594 | /// True if this tag declaration is a scoped enumeration. Only |
3595 | /// possible in C++11 mode. |
3596 | void setScoped(bool Scoped = true) { EnumDeclBits.IsScoped = Scoped; } |
3597 | |
3598 | /// If this tag declaration is a scoped enum, |
3599 | /// then this is true if the scoped enum was declared using the class |
3600 | /// tag, false if it was declared with the struct tag. No meaning is |
3601 | /// associated if this tag declaration is not a scoped enum. |
3602 | void setScopedUsingClassTag(bool ScopedUCT = true) { |
3603 | EnumDeclBits.IsScopedUsingClassTag = ScopedUCT; |
3604 | } |
3605 | |
3606 | /// True if this is an Objective-C, C++11, or |
3607 | /// Microsoft-style enumeration with a fixed underlying type. |
3608 | void setFixed(bool Fixed = true) { EnumDeclBits.IsFixed = Fixed; } |
3609 | |
3610 | private: |
3611 | /// True if a valid hash is stored in ODRHash. |
3612 | bool hasODRHash() const { return EnumDeclBits.HasODRHash; } |
3613 | void setHasODRHash(bool Hash = true) { EnumDeclBits.HasODRHash = Hash; } |
3614 | |
3615 | public: |
3616 | friend class ASTDeclReader; |
3617 | |
3618 | EnumDecl *getCanonicalDecl() override { |
3619 | return cast<EnumDecl>(TagDecl::getCanonicalDecl()); |
3620 | } |
3621 | const EnumDecl *getCanonicalDecl() const { |
3622 | return const_cast<EnumDecl*>(this)->getCanonicalDecl(); |
3623 | } |
3624 | |
3625 | EnumDecl *getPreviousDecl() { |
3626 | return cast_or_null<EnumDecl>( |
3627 | static_cast<TagDecl *>(this)->getPreviousDecl()); |
3628 | } |
3629 | const EnumDecl *getPreviousDecl() const { |
3630 | return const_cast<EnumDecl*>(this)->getPreviousDecl(); |
3631 | } |
3632 | |
3633 | EnumDecl *getMostRecentDecl() { |
3634 | return cast<EnumDecl>(static_cast<TagDecl *>(this)->getMostRecentDecl()); |
3635 | } |
3636 | const EnumDecl *getMostRecentDecl() const { |
3637 | return const_cast<EnumDecl*>(this)->getMostRecentDecl(); |
3638 | } |
3639 | |
3640 | EnumDecl *getDefinition() const { |
3641 | return cast_or_null<EnumDecl>(TagDecl::getDefinition()); |
3642 | } |
3643 | |
3644 | static EnumDecl *Create(ASTContext &C, DeclContext *DC, |
3645 | SourceLocation StartLoc, SourceLocation IdLoc, |
3646 | IdentifierInfo *Id, EnumDecl *PrevDecl, |
3647 | bool IsScoped, bool IsScopedUsingClassTag, |
3648 | bool IsFixed); |
3649 | static EnumDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
3650 | |
3651 | /// When created, the EnumDecl corresponds to a |
3652 | /// forward-declared enum. This method is used to mark the |
3653 | /// declaration as being defined; its enumerators have already been |
3654 | /// added (via DeclContext::addDecl). NewType is the new underlying |
3655 | /// type of the enumeration type. |
3656 | void completeDefinition(QualType NewType, |
3657 | QualType PromotionType, |
3658 | unsigned NumPositiveBits, |
3659 | unsigned NumNegativeBits); |
3660 | |
3661 | // Iterates through the enumerators of this enumeration. |
3662 | using enumerator_iterator = specific_decl_iterator<EnumConstantDecl>; |
3663 | using enumerator_range = |
3664 | llvm::iterator_range<specific_decl_iterator<EnumConstantDecl>>; |
3665 | |
3666 | enumerator_range enumerators() const { |
3667 | return enumerator_range(enumerator_begin(), enumerator_end()); |
3668 | } |
3669 | |
3670 | enumerator_iterator enumerator_begin() const { |
3671 | const EnumDecl *E = getDefinition(); |
3672 | if (!E) |
3673 | E = this; |
3674 | return enumerator_iterator(E->decls_begin()); |
3675 | } |
3676 | |
3677 | enumerator_iterator enumerator_end() const { |
3678 | const EnumDecl *E = getDefinition(); |
3679 | if (!E) |
3680 | E = this; |
3681 | return enumerator_iterator(E->decls_end()); |
3682 | } |
3683 | |
3684 | /// Return the integer type that enumerators should promote to. |
3685 | QualType getPromotionType() const { return PromotionType; } |
3686 | |
3687 | /// Set the promotion type. |
3688 | void setPromotionType(QualType T) { PromotionType = T; } |
3689 | |
3690 | /// Return the integer type this enum decl corresponds to. |
3691 | /// This returns a null QualType for an enum forward definition with no fixed |
3692 | /// underlying type. |
3693 | QualType getIntegerType() const { |
3694 | if (!IntegerType) |
3695 | return QualType(); |
3696 | if (const Type *T = IntegerType.dyn_cast<const Type*>()) |
3697 | return QualType(T, 0); |
3698 | return IntegerType.get<TypeSourceInfo*>()->getType().getUnqualifiedType(); |
3699 | } |
3700 | |
3701 | /// Set the underlying integer type. |
3702 | void setIntegerType(QualType T) { IntegerType = T.getTypePtrOrNull(); } |
3703 | |
3704 | /// Set the underlying integer type source info. |
3705 | void setIntegerTypeSourceInfo(TypeSourceInfo *TInfo) { IntegerType = TInfo; } |
3706 | |
3707 | /// Return the type source info for the underlying integer type, |
3708 | /// if no type source info exists, return 0. |
3709 | TypeSourceInfo *getIntegerTypeSourceInfo() const { |
3710 | return IntegerType.dyn_cast<TypeSourceInfo*>(); |
3711 | } |
3712 | |
3713 | /// Retrieve the source range that covers the underlying type if |
3714 | /// specified. |
3715 | SourceRange getIntegerTypeRange() const LLVM_READONLY__attribute__((__pure__)); |
3716 | |
3717 | /// Returns the width in bits required to store all the |
3718 | /// non-negative enumerators of this enum. |
3719 | unsigned getNumPositiveBits() const { return EnumDeclBits.NumPositiveBits; } |
3720 | |
3721 | /// Returns the width in bits required to store all the |
3722 | /// negative enumerators of this enum. These widths include |
3723 | /// the rightmost leading 1; that is: |
3724 | /// |
3725 | /// MOST NEGATIVE ENUMERATOR PATTERN NUM NEGATIVE BITS |
3726 | /// ------------------------ ------- ----------------- |
3727 | /// -1 1111111 1 |
3728 | /// -10 1110110 5 |
3729 | /// -101 1001011 8 |
3730 | unsigned getNumNegativeBits() const { return EnumDeclBits.NumNegativeBits; } |
3731 | |
3732 | /// Returns true if this is a C++11 scoped enumeration. |
3733 | bool isScoped() const { return EnumDeclBits.IsScoped; } |
3734 | |
3735 | /// Returns true if this is a C++11 scoped enumeration. |
3736 | bool isScopedUsingClassTag() const { |
3737 | return EnumDeclBits.IsScopedUsingClassTag; |
3738 | } |
3739 | |
3740 | /// Returns true if this is an Objective-C, C++11, or |
3741 | /// Microsoft-style enumeration with a fixed underlying type. |
3742 | bool isFixed() const { return EnumDeclBits.IsFixed; } |
3743 | |
3744 | unsigned getODRHash(); |
3745 | |
3746 | /// Returns true if this can be considered a complete type. |
3747 | bool isComplete() const { |
3748 | // IntegerType is set for fixed type enums and non-fixed but implicitly |
3749 | // int-sized Microsoft enums. |
3750 | return isCompleteDefinition() || IntegerType; |
3751 | } |
3752 | |
3753 | /// Returns true if this enum is either annotated with |
3754 | /// enum_extensibility(closed) or isn't annotated with enum_extensibility. |
3755 | bool isClosed() const; |
3756 | |
3757 | /// Returns true if this enum is annotated with flag_enum and isn't annotated |
3758 | /// with enum_extensibility(open). |
3759 | bool isClosedFlag() const; |
3760 | |
3761 | /// Returns true if this enum is annotated with neither flag_enum nor |
3762 | /// enum_extensibility(open). |
3763 | bool isClosedNonFlag() const; |
3764 | |
3765 | /// Retrieve the enum definition from which this enumeration could |
3766 | /// be instantiated, if it is an instantiation (rather than a non-template). |
3767 | EnumDecl *getTemplateInstantiationPattern() const; |
3768 | |
3769 | /// Returns the enumeration (declared within the template) |
3770 | /// from which this enumeration type was instantiated, or NULL if |
3771 | /// this enumeration was not instantiated from any template. |
3772 | EnumDecl *getInstantiatedFromMemberEnum() const; |
3773 | |
3774 | /// If this enumeration is a member of a specialization of a |
3775 | /// templated class, determine what kind of template specialization |
3776 | /// or instantiation this is. |
3777 | TemplateSpecializationKind getTemplateSpecializationKind() const; |
3778 | |
3779 | /// For an enumeration member that was instantiated from a member |
3780 | /// enumeration of a templated class, set the template specialiation kind. |
3781 | void setTemplateSpecializationKind(TemplateSpecializationKind TSK, |
3782 | SourceLocation PointOfInstantiation = SourceLocation()); |
3783 | |
3784 | /// If this enumeration is an instantiation of a member enumeration of |
3785 | /// a class template specialization, retrieves the member specialization |
3786 | /// information. |
3787 | MemberSpecializationInfo *getMemberSpecializationInfo() const { |
3788 | return SpecializationInfo; |
3789 | } |
3790 | |
3791 | /// Specify that this enumeration is an instantiation of the |
3792 | /// member enumeration ED. |
3793 | void setInstantiationOfMemberEnum(EnumDecl *ED, |
3794 | TemplateSpecializationKind TSK) { |
3795 | setInstantiationOfMemberEnum(getASTContext(), ED, TSK); |
3796 | } |
3797 | |
3798 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3799 | static bool classofKind(Kind K) { return K == Enum; } |
3800 | }; |
3801 | |
3802 | /// Represents a struct/union/class. For example: |
3803 | /// struct X; // Forward declaration, no "body". |
3804 | /// union Y { int A, B; }; // Has body with members A and B (FieldDecls). |
3805 | /// This decl will be marked invalid if *any* members are invalid. |
3806 | class RecordDecl : public TagDecl { |
3807 | // This class stores some data in DeclContext::RecordDeclBits |
3808 | // to save some space. Use the provided accessors to access it. |
3809 | public: |
3810 | friend class DeclContext; |
3811 | /// Enum that represents the different ways arguments are passed to and |
3812 | /// returned from function calls. This takes into account the target-specific |
3813 | /// and version-specific rules along with the rules determined by the |
3814 | /// language. |
3815 | enum ArgPassingKind : unsigned { |
3816 | /// The argument of this type can be passed directly in registers. |
3817 | APK_CanPassInRegs, |
3818 | |
3819 | /// The argument of this type cannot be passed directly in registers. |
3820 | /// Records containing this type as a subobject are not forced to be passed |
3821 | /// indirectly. This value is used only in C++. This value is required by |
3822 | /// C++ because, in uncommon situations, it is possible for a class to have |
3823 | /// only trivial copy/move constructors even when one of its subobjects has |
3824 | /// a non-trivial copy/move constructor (if e.g. the corresponding copy/move |
3825 | /// constructor in the derived class is deleted). |
3826 | APK_CannotPassInRegs, |
3827 | |
3828 | /// The argument of this type cannot be passed directly in registers. |
3829 | /// Records containing this type as a subobject are forced to be passed |
3830 | /// indirectly. |
3831 | APK_CanNeverPassInRegs |
3832 | }; |
3833 | |
3834 | protected: |
3835 | RecordDecl(Kind DK, TagKind TK, const ASTContext &C, DeclContext *DC, |
3836 | SourceLocation StartLoc, SourceLocation IdLoc, |
3837 | IdentifierInfo *Id, RecordDecl *PrevDecl); |
3838 | |
3839 | public: |
3840 | static RecordDecl *Create(const ASTContext &C, TagKind TK, DeclContext *DC, |
3841 | SourceLocation StartLoc, SourceLocation IdLoc, |
3842 | IdentifierInfo *Id, RecordDecl* PrevDecl = nullptr); |
3843 | static RecordDecl *CreateDeserialized(const ASTContext &C, unsigned ID); |
3844 | |
3845 | RecordDecl *getPreviousDecl() { |
3846 | return cast_or_null<RecordDecl>( |
3847 | static_cast<TagDecl *>(this)->getPreviousDecl()); |
3848 | } |
3849 | const RecordDecl *getPreviousDecl() const { |
3850 | return const_cast<RecordDecl*>(this)->getPreviousDecl(); |
3851 | } |
3852 | |
3853 | RecordDecl *getMostRecentDecl() { |
3854 | return cast<RecordDecl>(static_cast<TagDecl *>(this)->getMostRecentDecl()); |
3855 | } |
3856 | const RecordDecl *getMostRecentDecl() const { |
3857 | return const_cast<RecordDecl*>(this)->getMostRecentDecl(); |
3858 | } |
3859 | |
3860 | bool hasFlexibleArrayMember() const { |
3861 | return RecordDeclBits.HasFlexibleArrayMember; |
3862 | } |
3863 | |
3864 | void setHasFlexibleArrayMember(bool V) { |
3865 | RecordDeclBits.HasFlexibleArrayMember = V; |
3866 | } |
3867 | |
3868 | /// Whether this is an anonymous struct or union. To be an anonymous |
3869 | /// struct or union, it must have been declared without a name and |
3870 | /// there must be no objects of this type declared, e.g., |
3871 | /// @code |
3872 | /// union { int i; float f; }; |
3873 | /// @endcode |
3874 | /// is an anonymous union but neither of the following are: |
3875 | /// @code |
3876 | /// union X { int i; float f; }; |
3877 | /// union { int i; float f; } obj; |
3878 | /// @endcode |
3879 | bool isAnonymousStructOrUnion() const { |
3880 | return RecordDeclBits.AnonymousStructOrUnion; |
3881 | } |
3882 | |
3883 | void setAnonymousStructOrUnion(bool Anon) { |
3884 | RecordDeclBits.AnonymousStructOrUnion = Anon; |
3885 | } |
3886 | |
3887 | bool hasObjectMember() const { return RecordDeclBits.HasObjectMember; } |
3888 | void setHasObjectMember(bool val) { RecordDeclBits.HasObjectMember = val; } |
3889 | |
3890 | bool hasVolatileMember() const { return RecordDeclBits.HasVolatileMember; } |
3891 | |
3892 | void setHasVolatileMember(bool val) { |
3893 | RecordDeclBits.HasVolatileMember = val; |
3894 | } |
3895 | |
3896 | bool hasLoadedFieldsFromExternalStorage() const { |
3897 | return RecordDeclBits.LoadedFieldsFromExternalStorage; |
3898 | } |
3899 | |
3900 | void setHasLoadedFieldsFromExternalStorage(bool val) const { |
3901 | RecordDeclBits.LoadedFieldsFromExternalStorage = val; |
3902 | } |
3903 | |
3904 | /// Functions to query basic properties of non-trivial C structs. |
3905 | bool isNonTrivialToPrimitiveDefaultInitialize() const { |
3906 | return RecordDeclBits.NonTrivialToPrimitiveDefaultInitialize; |
3907 | } |
3908 | |
3909 | void setNonTrivialToPrimitiveDefaultInitialize(bool V) { |
3910 | RecordDeclBits.NonTrivialToPrimitiveDefaultInitialize = V; |
3911 | } |
3912 | |
3913 | bool isNonTrivialToPrimitiveCopy() const { |
3914 | return RecordDeclBits.NonTrivialToPrimitiveCopy; |
3915 | } |
3916 | |
3917 | void setNonTrivialToPrimitiveCopy(bool V) { |
3918 | RecordDeclBits.NonTrivialToPrimitiveCopy = V; |
3919 | } |
3920 | |
3921 | bool isNonTrivialToPrimitiveDestroy() const { |
3922 | return RecordDeclBits.NonTrivialToPrimitiveDestroy; |
3923 | } |
3924 | |
3925 | void setNonTrivialToPrimitiveDestroy(bool V) { |
3926 | RecordDeclBits.NonTrivialToPrimitiveDestroy = V; |
3927 | } |
3928 | |
3929 | bool hasNonTrivialToPrimitiveDefaultInitializeCUnion() const { |
3930 | return RecordDeclBits.HasNonTrivialToPrimitiveDefaultInitializeCUnion; |
3931 | } |
3932 | |
3933 | void setHasNonTrivialToPrimitiveDefaultInitializeCUnion(bool V) { |
3934 | RecordDeclBits.HasNonTrivialToPrimitiveDefaultInitializeCUnion = V; |
3935 | } |
3936 | |
3937 | bool hasNonTrivialToPrimitiveDestructCUnion() const { |
3938 | return RecordDeclBits.HasNonTrivialToPrimitiveDestructCUnion; |
3939 | } |
3940 | |
3941 | void setHasNonTrivialToPrimitiveDestructCUnion(bool V) { |
3942 | RecordDeclBits.HasNonTrivialToPrimitiveDestructCUnion = V; |
3943 | } |
3944 | |
3945 | bool hasNonTrivialToPrimitiveCopyCUnion() const { |
3946 | return RecordDeclBits.HasNonTrivialToPrimitiveCopyCUnion; |
3947 | } |
3948 | |
3949 | void setHasNonTrivialToPrimitiveCopyCUnion(bool V) { |
3950 | RecordDeclBits.HasNonTrivialToPrimitiveCopyCUnion = V; |
3951 | } |
3952 | |
3953 | /// Determine whether this class can be passed in registers. In C++ mode, |
3954 | /// it must have at least one trivial, non-deleted copy or move constructor. |
3955 | /// FIXME: This should be set as part of completeDefinition. |
3956 | bool canPassInRegisters() const { |
3957 | return getArgPassingRestrictions() == APK_CanPassInRegs; |
3958 | } |
3959 | |
3960 | ArgPassingKind getArgPassingRestrictions() const { |
3961 | return static_cast<ArgPassingKind>(RecordDeclBits.ArgPassingRestrictions); |
3962 | } |
3963 | |
3964 | void setArgPassingRestrictions(ArgPassingKind Kind) { |
3965 | RecordDeclBits.ArgPassingRestrictions = Kind; |
3966 | } |
3967 | |
3968 | bool isParamDestroyedInCallee() const { |
3969 | return RecordDeclBits.ParamDestroyedInCallee; |
3970 | } |
3971 | |
3972 | void setParamDestroyedInCallee(bool V) { |
3973 | RecordDeclBits.ParamDestroyedInCallee = V; |
3974 | } |
3975 | |
3976 | /// Determines whether this declaration represents the |
3977 | /// injected class name. |
3978 | /// |
3979 | /// The injected class name in C++ is the name of the class that |
3980 | /// appears inside the class itself. For example: |
3981 | /// |
3982 | /// \code |
3983 | /// struct C { |
3984 | /// // C is implicitly declared here as a synonym for the class name. |
3985 | /// }; |
3986 | /// |
3987 | /// C::C c; // same as "C c;" |
3988 | /// \endcode |
3989 | bool isInjectedClassName() const; |
3990 | |
3991 | /// Determine whether this record is a class describing a lambda |
3992 | /// function object. |
3993 | bool isLambda() const; |
3994 | |
3995 | /// Determine whether this record is a record for captured variables in |
3996 | /// CapturedStmt construct. |
3997 | bool isCapturedRecord() const; |
3998 | |
3999 | /// Mark the record as a record for captured variables in CapturedStmt |
4000 | /// construct. |
4001 | void setCapturedRecord(); |
4002 | |
4003 | /// Returns the RecordDecl that actually defines |
4004 | /// this struct/union/class. When determining whether or not a |
4005 | /// struct/union/class is completely defined, one should use this |
4006 | /// method as opposed to 'isCompleteDefinition'. |
4007 | /// 'isCompleteDefinition' indicates whether or not a specific |
4008 | /// RecordDecl is a completed definition, not whether or not the |
4009 | /// record type is defined. This method returns NULL if there is |
4010 | /// no RecordDecl that defines the struct/union/tag. |
4011 | RecordDecl *getDefinition() const { |
4012 | return cast_or_null<RecordDecl>(TagDecl::getDefinition()); |
4013 | } |
4014 | |
4015 | /// Returns whether this record is a union, or contains (at any nesting level) |
4016 | /// a union member. This is used by CMSE to warn about possible information |
4017 | /// leaks. |
4018 | bool isOrContainsUnion() const; |
4019 | |
4020 | // Iterator access to field members. The field iterator only visits |
4021 | // the non-static data members of this class, ignoring any static |
4022 | // data members, functions, constructors, destructors, etc. |
4023 | using field_iterator = specific_decl_iterator<FieldDecl>; |
4024 | using field_range = llvm::iterator_range<specific_decl_iterator<FieldDecl>>; |
4025 | |
4026 | field_range fields() const { return field_range(field_begin(), field_end()); } |
4027 | field_iterator field_begin() const; |
4028 | |
4029 | field_iterator field_end() const { |
4030 | return field_iterator(decl_iterator()); |
4031 | } |
4032 | |
4033 | // Whether there are any fields (non-static data members) in this record. |
4034 | bool field_empty() const { |
4035 | return field_begin() == field_end(); |
4036 | } |
4037 | |
4038 | /// Note that the definition of this type is now complete. |
4039 | virtual void completeDefinition(); |
4040 | |
4041 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
4042 | static bool classofKind(Kind K) { |
4043 | return K >= firstRecord && K <= lastRecord; |
4044 | } |
4045 | |
4046 | /// Get whether or not this is an ms_struct which can |
4047 | /// be turned on with an attribute, pragma, or -mms-bitfields |
4048 | /// commandline option. |
4049 | bool isMsStruct(const ASTContext &C) const; |
4050 | |
4051 | /// Whether we are allowed to insert extra padding between fields. |
4052 | /// These padding are added to help AddressSanitizer detect |
4053 | /// intra-object-overflow bugs. |
4054 | bool mayInsertExtraPadding(bool EmitRemark = false) const; |
4055 | |
4056 | /// Finds the first data member which has a name. |
4057 | /// nullptr is returned if no named data member exists. |
4058 | const FieldDecl *findFirstNamedDataMember() const; |
4059 | |
4060 | private: |
4061 | /// Deserialize just the fields. |
4062 | void LoadFieldsFromExternalStorage() const; |
4063 | }; |
4064 | |
4065 | class FileScopeAsmDecl : public Decl { |
4066 | StringLiteral *AsmString; |
4067 | SourceLocation RParenLoc; |
4068 | |
4069 | FileScopeAsmDecl(DeclContext *DC, StringLiteral *asmstring, |
4070 | SourceLocation StartL, SourceLocation EndL) |
4071 | : Decl(FileScopeAsm, DC, StartL), AsmString(asmstring), RParenLoc(EndL) {} |
4072 | |
4073 | virtual void anchor(); |
4074 | |
4075 | public: |
4076 | static FileScopeAsmDecl *Create(ASTContext &C, DeclContext *DC, |
4077 | StringLiteral *Str, SourceLocation AsmLoc, |
4078 | SourceLocation RParenLoc); |
4079 | |
4080 | static FileScopeAsmDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
4081 | |
4082 | SourceLocation getAsmLoc() const { return getLocation(); } |
4083 | SourceLocation getRParenLoc() const { return RParenLoc; } |
4084 | void setRParenLoc(SourceLocation L) { RParenLoc = L; } |
4085 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) { |
4086 | return SourceRange(getAsmLoc(), getRParenLoc()); |
4087 | } |
4088 | |
4089 | const StringLiteral *getAsmString() const { return AsmString; } |
4090 | StringLiteral *getAsmString() { return AsmString; } |
4091 | void setAsmString(StringLiteral *Asm) { AsmString = Asm; } |
4092 | |
4093 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
4094 | static bool classofKind(Kind K) { return K == FileScopeAsm; } |
4095 | }; |
4096 | |
4097 | /// Represents a block literal declaration, which is like an |
4098 | /// unnamed FunctionDecl. For example: |
4099 | /// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } |
4100 | class BlockDecl : public Decl, public DeclContext { |
4101 | // This class stores some data in DeclContext::BlockDeclBits |
4102 | // to save some space. Use the provided accessors to access it. |
4103 | public: |
4104 | /// A class which contains all the information about a particular |
4105 | /// captured value. |
4106 | class Capture { |
4107 | enum { |
4108 | flag_isByRef = 0x1, |
4109 | flag_isNested = 0x2 |
4110 | }; |
4111 | |
4112 | /// The variable being captured. |
4113 | llvm::PointerIntPair<VarDecl*, 2> VariableAndFlags; |
4114 | |
4115 | /// The copy expression, expressed in terms of a DeclRef (or |
4116 | /// BlockDeclRef) to the captured variable. Only required if the |
4117 | /// variable has a C++ class type. |
4118 | Expr *CopyExpr; |
4119 | |
4120 | public: |
4121 | Capture(VarDecl *variable, bool byRef, bool nested, Expr *copy) |
4122 | : VariableAndFlags(variable, |
4123 | (byRef ? flag_isByRef : 0) | (nested ? flag_isNested : 0)), |
4124 | CopyExpr(copy) {} |
4125 | |
4126 | /// The variable being captured. |
4127 | VarDecl *getVariable() const { return VariableAndFlags.getPointer(); } |
4128 | |
4129 | /// Whether this is a "by ref" capture, i.e. a capture of a __block |
4130 | /// variable. |
4131 | bool isByRef() const { return VariableAndFlags.getInt() & flag_isByRef; } |
4132 | |
4133 | bool isEscapingByref() const { |
4134 | return getVariable()->isEscapingByref(); |
4135 | } |
4136 | |
4137 | bool isNonEscapingByref() const { |
4138 | return getVariable()->isNonEscapingByref(); |
4139 | } |
4140 | |
4141 | /// Whether this is a nested capture, i.e. the variable captured |
4142 | /// is not from outside the immediately enclosing function/block. |
4143 | bool isNested() const { return VariableAndFlags.getInt() & flag_isNested; } |
4144 | |
4145 | bool hasCopyExpr() const { return CopyExpr != nullptr; } |
4146 | Expr *getCopyExpr() const { return CopyExpr; } |
4147 | void setCopyExpr(Expr *e) { CopyExpr = e; } |
4148 | }; |
4149 | |
4150 | private: |
4151 | /// A new[]'d array of pointers to ParmVarDecls for the formal |
4152 | /// parameters of this function. This is null if a prototype or if there are |
4153 | /// no formals. |
4154 | ParmVarDecl **ParamInfo = nullptr; |
4155 | unsigned NumParams = 0; |
4156 | |
4157 | Stmt *Body = nullptr; |
4158 | TypeSourceInfo *SignatureAsWritten = nullptr; |
4159 | |
4160 | const Capture *Captures = nullptr; |
4161 | unsigned NumCaptures = 0; |
4162 | |
4163 | unsigned ManglingNumber = 0; |
4164 | Decl *ManglingContextDecl = nullptr; |
4165 | |
4166 | protected: |
4167 | BlockDecl(DeclContext *DC, SourceLocation CaretLoc); |
4168 | |
4169 | public: |
4170 | static BlockDecl *Create(ASTContext &C, DeclContext *DC, SourceLocation L); |
4171 | static BlockDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
4172 | |
4173 | SourceLocation getCaretLocation() const { return getLocation(); } |
4174 | |
4175 | bool isVariadic() const { return BlockDeclBits.IsVariadic; } |
4176 | void setIsVariadic(bool value) { BlockDeclBits.IsVariadic = value; } |
4177 | |
4178 | CompoundStmt *getCompoundBody() const { return (CompoundStmt*) Body; } |
4179 | Stmt *getBody() const override { return (Stmt*) Body; } |
4180 | void setBody(CompoundStmt *B) { Body = (Stmt*) B; } |
4181 | |
4182 | void setSignatureAsWritten(TypeSourceInfo *Sig) { SignatureAsWritten = Sig; } |
4183 | TypeSourceInfo *getSignatureAsWritten() const { return SignatureAsWritten; } |
4184 | |
4185 | // ArrayRef access to formal parameters. |
4186 | ArrayRef<ParmVarDecl *> parameters() const { |
4187 | return {ParamInfo, getNumParams()}; |
4188 | } |
4189 | MutableArrayRef<ParmVarDecl *> parameters() { |
4190 | return {ParamInfo, getNumParams()}; |
4191 | } |
4192 | |
4193 | // Iterator access to formal parameters. |
4194 | using param_iterator = MutableArrayRef<ParmVarDecl *>::iterator; |
4195 | using param_const_iterator = ArrayRef<ParmVarDecl *>::const_iterator; |
4196 | |
4197 | bool param_empty() const { return parameters().empty(); } |
4198 | param_iterator param_begin() { return parameters().begin(); } |
4199 | param_iterator param_end() { return parameters().end(); } |
4200 | param_const_iterator param_begin() const { return parameters().begin(); } |
4201 | param_const_iterator param_end() const { return parameters().end(); } |
4202 | size_t param_size() const { return parameters().size(); } |
4203 | |
4204 | unsigned getNumParams() const { return NumParams; } |
4205 | |
4206 | const ParmVarDecl *getParamDecl(unsigned i) const { |
4207 | assert(i < getNumParams() && "Illegal param #")((i < getNumParams() && "Illegal param #") ? static_cast <void> (0) : __assert_fail ("i < getNumParams() && \"Illegal param #\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 4207, __PRETTY_FUNCTION__)); |
4208 | return ParamInfo[i]; |
4209 | } |
4210 | ParmVarDecl *getParamDecl(unsigned i) { |
4211 | assert(i < getNumParams() && "Illegal param #")((i < getNumParams() && "Illegal param #") ? static_cast <void> (0) : __assert_fail ("i < getNumParams() && \"Illegal param #\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 4211, __PRETTY_FUNCTION__)); |
4212 | return ParamInfo[i]; |
4213 | } |
4214 | |
4215 | void setParams(ArrayRef<ParmVarDecl *> NewParamInfo); |
4216 | |
4217 | /// True if this block (or its nested blocks) captures |
4218 | /// anything of local storage from its enclosing scopes. |
4219 | bool hasCaptures() const { return NumCaptures || capturesCXXThis(); } |
4220 | |
4221 | /// Returns the number of captured variables. |
4222 | /// Does not include an entry for 'this'. |
4223 | unsigned getNumCaptures() const { return NumCaptures; } |
4224 | |
4225 | using capture_const_iterator = ArrayRef<Capture>::const_iterator; |
4226 | |
4227 | ArrayRef<Capture> captures() const { return {Captures, NumCaptures}; } |
4228 | |
4229 | capture_const_iterator capture_begin() const { return captures().begin(); } |
4230 | capture_const_iterator capture_end() const { return captures().end(); } |
4231 | |
4232 | bool capturesCXXThis() const { return BlockDeclBits.CapturesCXXThis; } |
4233 | void setCapturesCXXThis(bool B = true) { BlockDeclBits.CapturesCXXThis = B; } |
4234 | |
4235 | bool blockMissingReturnType() const { |
4236 | return BlockDeclBits.BlockMissingReturnType; |
4237 | } |
4238 | |
4239 | void setBlockMissingReturnType(bool val = true) { |
4240 | BlockDeclBits.BlockMissingReturnType = val; |
4241 | } |
4242 | |
4243 | bool isConversionFromLambda() const { |
4244 | return BlockDeclBits.IsConversionFromLambda; |
4245 | } |
4246 | |
4247 | void setIsConversionFromLambda(bool val = true) { |
4248 | BlockDeclBits.IsConversionFromLambda = val; |
4249 | } |
4250 | |
4251 | bool doesNotEscape() const { return BlockDeclBits.DoesNotEscape; } |
4252 | void setDoesNotEscape(bool B = true) { BlockDeclBits.DoesNotEscape = B; } |
4253 | |
4254 | bool canAvoidCopyToHeap() const { |
4255 | return BlockDeclBits.CanAvoidCopyToHeap; |
4256 | } |
4257 | void setCanAvoidCopyToHeap(bool B = true) { |
4258 | BlockDeclBits.CanAvoidCopyToHeap = B; |
4259 | } |
4260 | |
4261 | bool capturesVariable(const VarDecl *var) const; |
4262 | |
4263 | void setCaptures(ASTContext &Context, ArrayRef<Capture> Captures, |
4264 | bool CapturesCXXThis); |
4265 | |
4266 | unsigned getBlockManglingNumber() const { return ManglingNumber; } |
4267 | |
4268 | Decl *getBlockManglingContextDecl() const { return ManglingContextDecl; } |
4269 | |
4270 | void setBlockMangling(unsigned Number, Decl *Ctx) { |
4271 | ManglingNumber = Number; |
4272 | ManglingContextDecl = Ctx; |
4273 | } |
4274 | |
4275 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
4276 | |
4277 | // Implement isa/cast/dyncast/etc. |
4278 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
4279 | static bool classofKind(Kind K) { return K == Block; } |
4280 | static DeclContext *castToDeclContext(const BlockDecl *D) { |
4281 | return static_cast<DeclContext *>(const_cast<BlockDecl*>(D)); |
4282 | } |
4283 | static BlockDecl *castFromDeclContext(const DeclContext *DC) { |
4284 | return static_cast<BlockDecl *>(const_cast<DeclContext*>(DC)); |
4285 | } |
4286 | }; |
4287 | |
4288 | /// Represents the body of a CapturedStmt, and serves as its DeclContext. |
4289 | class CapturedDecl final |
4290 | : public Decl, |
4291 | public DeclContext, |
4292 | private llvm::TrailingObjects<CapturedDecl, ImplicitParamDecl *> { |
4293 | protected: |
4294 | size_t numTrailingObjects(OverloadToken<ImplicitParamDecl>) { |
4295 | return NumParams; |
4296 | } |
4297 | |
4298 | private: |
4299 | /// The number of parameters to the outlined function. |
4300 | unsigned NumParams; |
4301 | |
4302 | /// The position of context parameter in list of parameters. |
4303 | unsigned ContextParam; |
4304 | |
4305 | /// The body of the outlined function. |
4306 | llvm::PointerIntPair<Stmt *, 1, bool> BodyAndNothrow; |
4307 | |
4308 | explicit CapturedDecl(DeclContext *DC, unsigned NumParams); |
4309 | |
4310 | ImplicitParamDecl *const *getParams() const { |
4311 | return getTrailingObjects<ImplicitParamDecl *>(); |
4312 | } |
4313 | |
4314 | ImplicitParamDecl **getParams() { |
4315 | return getTrailingObjects<ImplicitParamDecl *>(); |
4316 | } |
4317 | |
4318 | public: |
4319 | friend class ASTDeclReader; |
4320 | friend class ASTDeclWriter; |
4321 | friend TrailingObjects; |
4322 | |
4323 | static CapturedDecl *Create(ASTContext &C, DeclContext *DC, |
4324 | unsigned NumParams); |
4325 | static CapturedDecl *CreateDeserialized(ASTContext &C, unsigned ID, |
4326 | unsigned NumParams); |
4327 | |
4328 | Stmt *getBody() const override; |
4329 | void setBody(Stmt *B); |
4330 | |
4331 | bool isNothrow() const; |
4332 | void setNothrow(bool Nothrow = true); |
4333 | |
4334 | unsigned getNumParams() const { return NumParams; } |
4335 | |
4336 | ImplicitParamDecl *getParam(unsigned i) const { |
4337 | assert(i < NumParams)((i < NumParams) ? static_cast<void> (0) : __assert_fail ("i < NumParams", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 4337, __PRETTY_FUNCTION__)); |
4338 | return getParams()[i]; |
4339 | } |
4340 | void setParam(unsigned i, ImplicitParamDecl *P) { |
4341 | assert(i < NumParams)((i < NumParams) ? static_cast<void> (0) : __assert_fail ("i < NumParams", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 4341, __PRETTY_FUNCTION__)); |
4342 | getParams()[i] = P; |
4343 | } |
4344 | |
4345 | // ArrayRef interface to parameters. |
4346 | ArrayRef<ImplicitParamDecl *> parameters() const { |
4347 | return {getParams(), getNumParams()}; |
4348 | } |
4349 | MutableArrayRef<ImplicitParamDecl *> parameters() { |
4350 | return {getParams(), getNumParams()}; |
4351 | } |
4352 | |
4353 | /// Retrieve the parameter containing captured variables. |
4354 | ImplicitParamDecl *getContextParam() const { |
4355 | assert(ContextParam < NumParams)((ContextParam < NumParams) ? static_cast<void> (0) : __assert_fail ("ContextParam < NumParams", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 4355, __PRETTY_FUNCTION__)); |
4356 | return getParam(ContextParam); |
4357 | } |
4358 | void setContextParam(unsigned i, ImplicitParamDecl *P) { |
4359 | assert(i < NumParams)((i < NumParams) ? static_cast<void> (0) : __assert_fail ("i < NumParams", "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 4359, __PRETTY_FUNCTION__)); |
4360 | ContextParam = i; |
4361 | setParam(i, P); |
4362 | } |
4363 | unsigned getContextParamPosition() const { return ContextParam; } |
4364 | |
4365 | using param_iterator = ImplicitParamDecl *const *; |
4366 | using param_range = llvm::iterator_range<param_iterator>; |
4367 | |
4368 | /// Retrieve an iterator pointing to the first parameter decl. |
4369 | param_iterator param_begin() const { return getParams(); } |
4370 | /// Retrieve an iterator one past the last parameter decl. |
4371 | param_iterator param_end() const { return getParams() + NumParams; } |
4372 | |
4373 | // Implement isa/cast/dyncast/etc. |
4374 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
4375 | static bool classofKind(Kind K) { return K == Captured; } |
4376 | static DeclContext *castToDeclContext(const CapturedDecl *D) { |
4377 | return static_cast<DeclContext *>(const_cast<CapturedDecl *>(D)); |
4378 | } |
4379 | static CapturedDecl *castFromDeclContext(const DeclContext *DC) { |
4380 | return static_cast<CapturedDecl *>(const_cast<DeclContext *>(DC)); |
4381 | } |
4382 | }; |
4383 | |
4384 | /// Describes a module import declaration, which makes the contents |
4385 | /// of the named module visible in the current translation unit. |
4386 | /// |
4387 | /// An import declaration imports the named module (or submodule). For example: |
4388 | /// \code |
4389 | /// @import std.vector; |
4390 | /// \endcode |
4391 | /// |
4392 | /// Import declarations can also be implicitly generated from |
4393 | /// \#include/\#import directives. |
4394 | class ImportDecl final : public Decl, |
4395 | llvm::TrailingObjects<ImportDecl, SourceLocation> { |
4396 | friend class ASTContext; |
4397 | friend class ASTDeclReader; |
4398 | friend class ASTReader; |
4399 | friend TrailingObjects; |
4400 | |
4401 | /// The imported module. |
4402 | Module *ImportedModule = nullptr; |
4403 | |
4404 | /// The next import in the list of imports local to the translation |
4405 | /// unit being parsed (not loaded from an AST file). |
4406 | /// |
4407 | /// Includes a bit that indicates whether we have source-location information |
4408 | /// for each identifier in the module name. |
4409 | /// |
4410 | /// When the bit is false, we only have a single source location for the |
4411 | /// end of the import declaration. |
4412 | llvm::PointerIntPair<ImportDecl *, 1, bool> NextLocalImportAndComplete; |
4413 | |
4414 | ImportDecl(DeclContext *DC, SourceLocation StartLoc, Module *Imported, |
4415 | ArrayRef<SourceLocation> IdentifierLocs); |
4416 | |
4417 | ImportDecl(DeclContext *DC, SourceLocation StartLoc, Module *Imported, |
4418 | SourceLocation EndLoc); |
4419 | |
4420 | ImportDecl(EmptyShell Empty) : Decl(Import, Empty) {} |
4421 | |
4422 | bool isImportComplete() const { return NextLocalImportAndComplete.getInt(); } |
4423 | |
4424 | void setImportComplete(bool C) { NextLocalImportAndComplete.setInt(C); } |
4425 | |
4426 | /// The next import in the list of imports local to the translation |
4427 | /// unit being parsed (not loaded from an AST file). |
4428 | ImportDecl *getNextLocalImport() const { |
4429 | return NextLocalImportAndComplete.getPointer(); |
4430 | } |
4431 | |
4432 | void setNextLocalImport(ImportDecl *Import) { |
4433 | NextLocalImportAndComplete.setPointer(Import); |
4434 | } |
4435 | |
4436 | public: |
4437 | /// Create a new module import declaration. |
4438 | static ImportDecl *Create(ASTContext &C, DeclContext *DC, |
4439 | SourceLocation StartLoc, Module *Imported, |
4440 | ArrayRef<SourceLocation> IdentifierLocs); |
4441 | |
4442 | /// Create a new module import declaration for an implicitly-generated |
4443 | /// import. |
4444 | static ImportDecl *CreateImplicit(ASTContext &C, DeclContext *DC, |
4445 | SourceLocation StartLoc, Module *Imported, |
4446 | SourceLocation EndLoc); |
4447 | |
4448 | /// Create a new, deserialized module import declaration. |
4449 | static ImportDecl *CreateDeserialized(ASTContext &C, unsigned ID, |
4450 | unsigned NumLocations); |
4451 | |
4452 | /// Retrieve the module that was imported by the import declaration. |
4453 | Module *getImportedModule() const { return ImportedModule; } |
4454 | |
4455 | /// Retrieves the locations of each of the identifiers that make up |
4456 | /// the complete module name in the import declaration. |
4457 | /// |
4458 | /// This will return an empty array if the locations of the individual |
4459 | /// identifiers aren't available. |
4460 | ArrayRef<SourceLocation> getIdentifierLocs() const; |
4461 | |
4462 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
4463 | |
4464 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
4465 | static bool classofKind(Kind K) { return K == Import; } |
4466 | }; |
4467 | |
4468 | /// Represents a C++ Modules TS module export declaration. |
4469 | /// |
4470 | /// For example: |
4471 | /// \code |
4472 | /// export void foo(); |
4473 | /// \endcode |
4474 | class ExportDecl final : public Decl, public DeclContext { |
4475 | virtual void anchor(); |
4476 | |
4477 | private: |
4478 | friend class ASTDeclReader; |
4479 | |
4480 | /// The source location for the right brace (if valid). |
4481 | SourceLocation RBraceLoc; |
4482 | |
4483 | ExportDecl(DeclContext *DC, SourceLocation ExportLoc) |
4484 | : Decl(Export, DC, ExportLoc), DeclContext(Export), |
4485 | RBraceLoc(SourceLocation()) {} |
4486 | |
4487 | public: |
4488 | static ExportDecl *Create(ASTContext &C, DeclContext *DC, |
4489 | SourceLocation ExportLoc); |
4490 | static ExportDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
4491 | |
4492 | SourceLocation getExportLoc() const { return getLocation(); } |
4493 | SourceLocation getRBraceLoc() const { return RBraceLoc; } |
4494 | void setRBraceLoc(SourceLocation L) { RBraceLoc = L; } |
4495 | |
4496 | bool hasBraces() const { return RBraceLoc.isValid(); } |
4497 | |
4498 | SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { |
4499 | if (hasBraces()) |
4500 | return RBraceLoc; |
4501 | // No braces: get the end location of the (only) declaration in context |
4502 | // (if present). |
4503 | return decls_empty() ? getLocation() : decls_begin()->getEndLoc(); |
4504 | } |
4505 | |
4506 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) { |
4507 | return SourceRange(getLocation(), getEndLoc()); |
4508 | } |
4509 | |
4510 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
4511 | static bool classofKind(Kind K) { return K == Export; } |
4512 | static DeclContext *castToDeclContext(const ExportDecl *D) { |
4513 | return static_cast<DeclContext *>(const_cast<ExportDecl*>(D)); |
4514 | } |
4515 | static ExportDecl *castFromDeclContext(const DeclContext *DC) { |
4516 | return static_cast<ExportDecl *>(const_cast<DeclContext*>(DC)); |
4517 | } |
4518 | }; |
4519 | |
4520 | /// Represents an empty-declaration. |
4521 | class EmptyDecl : public Decl { |
4522 | EmptyDecl(DeclContext *DC, SourceLocation L) : Decl(Empty, DC, L) {} |
4523 | |
4524 | virtual void anchor(); |
4525 | |
4526 | public: |
4527 | static EmptyDecl *Create(ASTContext &C, DeclContext *DC, |
4528 | SourceLocation L); |
4529 | static EmptyDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
4530 | |
4531 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
4532 | static bool classofKind(Kind K) { return K == Empty; } |
4533 | }; |
4534 | |
4535 | /// Insertion operator for diagnostics. This allows sending NamedDecl's |
4536 | /// into a diagnostic with <<. |
4537 | inline const StreamingDiagnostic &operator<<(const StreamingDiagnostic &PD, |
4538 | const NamedDecl *ND) { |
4539 | PD.AddTaggedVal(reinterpret_cast<intptr_t>(ND), |
4540 | DiagnosticsEngine::ak_nameddecl); |
4541 | return PD; |
4542 | } |
4543 | |
4544 | template<typename decl_type> |
4545 | void Redeclarable<decl_type>::setPreviousDecl(decl_type *PrevDecl) { |
4546 | // Note: This routine is implemented here because we need both NamedDecl |
4547 | // and Redeclarable to be defined. |
4548 | assert(RedeclLink.isFirst() &&((RedeclLink.isFirst() && "setPreviousDecl on a decl already in a redeclaration chain" ) ? static_cast<void> (0) : __assert_fail ("RedeclLink.isFirst() && \"setPreviousDecl on a decl already in a redeclaration chain\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 4549, __PRETTY_FUNCTION__)) |
4549 | "setPreviousDecl on a decl already in a redeclaration chain")((RedeclLink.isFirst() && "setPreviousDecl on a decl already in a redeclaration chain" ) ? static_cast<void> (0) : __assert_fail ("RedeclLink.isFirst() && \"setPreviousDecl on a decl already in a redeclaration chain\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 4549, __PRETTY_FUNCTION__)); |
4550 | |
4551 | if (PrevDecl) { |
4552 | // Point to previous. Make sure that this is actually the most recent |
4553 | // redeclaration, or we can build invalid chains. If the most recent |
4554 | // redeclaration is invalid, it won't be PrevDecl, but we want it anyway. |
4555 | First = PrevDecl->getFirstDecl(); |
4556 | assert(First->RedeclLink.isFirst() && "Expected first")((First->RedeclLink.isFirst() && "Expected first") ? static_cast<void> (0) : __assert_fail ("First->RedeclLink.isFirst() && \"Expected first\"" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 4556, __PRETTY_FUNCTION__)); |
4557 | decl_type *MostRecent = First->getNextRedeclaration(); |
4558 | RedeclLink = PreviousDeclLink(cast<decl_type>(MostRecent)); |
4559 | |
4560 | // If the declaration was previously visible, a redeclaration of it remains |
4561 | // visible even if it wouldn't be visible by itself. |
4562 | static_cast<decl_type*>(this)->IdentifierNamespace |= |
4563 | MostRecent->getIdentifierNamespace() & |
4564 | (Decl::IDNS_Ordinary | Decl::IDNS_Tag | Decl::IDNS_Type); |
4565 | } else { |
4566 | // Make this first. |
4567 | First = static_cast<decl_type*>(this); |
4568 | } |
4569 | |
4570 | // First one will point to this one as latest. |
4571 | First->RedeclLink.setLatest(static_cast<decl_type*>(this)); |
4572 | |
4573 | assert(!isa<NamedDecl>(static_cast<decl_type*>(this)) ||((!isa<NamedDecl>(static_cast<decl_type*>(this)) || cast<NamedDecl>(static_cast<decl_type*>(this))-> isLinkageValid()) ? static_cast<void> (0) : __assert_fail ("!isa<NamedDecl>(static_cast<decl_type*>(this)) || cast<NamedDecl>(static_cast<decl_type*>(this))->isLinkageValid()" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 4574, __PRETTY_FUNCTION__)) |
4574 | cast<NamedDecl>(static_cast<decl_type*>(this))->isLinkageValid())((!isa<NamedDecl>(static_cast<decl_type*>(this)) || cast<NamedDecl>(static_cast<decl_type*>(this))-> isLinkageValid()) ? static_cast<void> (0) : __assert_fail ("!isa<NamedDecl>(static_cast<decl_type*>(this)) || cast<NamedDecl>(static_cast<decl_type*>(this))->isLinkageValid()" , "/build/llvm-toolchain-snapshot-12~++20210114111115+2b1e25befefc/clang/include/clang/AST/Decl.h" , 4574, __PRETTY_FUNCTION__)); |
4575 | } |
4576 | |
4577 | // Inline function definitions. |
4578 | |
4579 | /// Check if the given decl is complete. |
4580 | /// |
4581 | /// We use this function to break a cycle between the inline definitions in |
4582 | /// Type.h and Decl.h. |
4583 | inline bool IsEnumDeclComplete(EnumDecl *ED) { |
4584 | return ED->isComplete(); |
4585 | } |
4586 | |
4587 | /// Check if the given decl is scoped. |
4588 | /// |
4589 | /// We use this function to break a cycle between the inline definitions in |
4590 | /// Type.h and Decl.h. |
4591 | inline bool IsEnumDeclScoped(EnumDecl *ED) { |
4592 | return ED->isScoped(); |
4593 | } |
4594 | |
4595 | /// OpenMP variants are mangled early based on their OpenMP context selector. |
4596 | /// The new name looks likes this: |
4597 | /// <name> + OpenMPVariantManglingSeparatorStr + <mangled OpenMP context> |
4598 | static constexpr StringRef getOpenMPVariantManglingSeparatorStr() { |
4599 | return "$ompvariant"; |
4600 | } |
4601 | |
4602 | } // namespace clang |
4603 | |
4604 | #endif // LLVM_CLANG_AST_DECL_H |