File: | clang/lib/Sema/SemaDeclCXX.cpp |
Warning: | line 5460, 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/STLExtras.h" | |||
42 | #include "llvm/ADT/SmallString.h" | |||
43 | #include "llvm/ADT/StringExtras.h" | |||
44 | #include <map> | |||
45 | #include <set> | |||
46 | ||||
47 | using namespace clang; | |||
48 | ||||
49 | //===----------------------------------------------------------------------===// | |||
50 | // CheckDefaultArgumentVisitor | |||
51 | //===----------------------------------------------------------------------===// | |||
52 | ||||
53 | namespace { | |||
54 | /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses | |||
55 | /// the default argument of a parameter to determine whether it | |||
56 | /// contains any ill-formed subexpressions. For example, this will | |||
57 | /// diagnose the use of local variables or parameters within the | |||
58 | /// default argument expression. | |||
59 | class CheckDefaultArgumentVisitor | |||
60 | : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { | |||
61 | Expr *DefaultArg; | |||
62 | Sema *S; | |||
63 | ||||
64 | public: | |||
65 | CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) | |||
66 | : DefaultArg(defarg), S(s) {} | |||
67 | ||||
68 | bool VisitExpr(Expr *Node); | |||
69 | bool VisitDeclRefExpr(DeclRefExpr *DRE); | |||
70 | bool VisitCXXThisExpr(CXXThisExpr *ThisE); | |||
71 | bool VisitLambdaExpr(LambdaExpr *Lambda); | |||
72 | bool VisitPseudoObjectExpr(PseudoObjectExpr *POE); | |||
73 | }; | |||
74 | ||||
75 | /// VisitExpr - Visit all of the children of this expression. | |||
76 | bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { | |||
77 | bool IsInvalid = false; | |||
78 | for (Stmt *SubStmt : Node->children()) | |||
79 | IsInvalid |= Visit(SubStmt); | |||
80 | return IsInvalid; | |||
81 | } | |||
82 | ||||
83 | /// VisitDeclRefExpr - Visit a reference to a declaration, to | |||
84 | /// determine whether this declaration can be used in the default | |||
85 | /// argument expression. | |||
86 | bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { | |||
87 | NamedDecl *Decl = DRE->getDecl(); | |||
88 | if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { | |||
89 | // C++ [dcl.fct.default]p9 | |||
90 | // Default arguments are evaluated each time the function is | |||
91 | // called. The order of evaluation of function arguments is | |||
92 | // unspecified. Consequently, parameters of a function shall not | |||
93 | // be used in default argument expressions, even if they are not | |||
94 | // evaluated. Parameters of a function declared before a default | |||
95 | // argument expression are in scope and can hide namespace and | |||
96 | // class member names. | |||
97 | return S->Diag(DRE->getBeginLoc(), | |||
98 | diag::err_param_default_argument_references_param) | |||
99 | << Param->getDeclName() << DefaultArg->getSourceRange(); | |||
100 | } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { | |||
101 | // C++ [dcl.fct.default]p7 | |||
102 | // Local variables shall not be used in default argument | |||
103 | // expressions. | |||
104 | if (VDecl->isLocalVarDecl()) | |||
105 | return S->Diag(DRE->getBeginLoc(), | |||
106 | diag::err_param_default_argument_references_local) | |||
107 | << VDecl->getDeclName() << DefaultArg->getSourceRange(); | |||
108 | } | |||
109 | ||||
110 | return false; | |||
111 | } | |||
112 | ||||
113 | /// VisitCXXThisExpr - Visit a C++ "this" expression. | |||
114 | bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { | |||
115 | // C++ [dcl.fct.default]p8: | |||
116 | // The keyword this shall not be used in a default argument of a | |||
117 | // member function. | |||
118 | return S->Diag(ThisE->getBeginLoc(), | |||
119 | diag::err_param_default_argument_references_this) | |||
120 | << ThisE->getSourceRange(); | |||
121 | } | |||
122 | ||||
123 | bool CheckDefaultArgumentVisitor::VisitPseudoObjectExpr(PseudoObjectExpr *POE) { | |||
124 | bool Invalid = false; | |||
125 | for (PseudoObjectExpr::semantics_iterator | |||
126 | i = POE->semantics_begin(), e = POE->semantics_end(); i != e; ++i) { | |||
127 | Expr *E = *i; | |||
128 | ||||
129 | // Look through bindings. | |||
130 | if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) { | |||
131 | E = OVE->getSourceExpr(); | |||
132 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 132, __PRETTY_FUNCTION__)); | |||
133 | } | |||
134 | ||||
135 | Invalid |= Visit(E); | |||
136 | } | |||
137 | return Invalid; | |||
138 | } | |||
139 | ||||
140 | bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { | |||
141 | // C++11 [expr.lambda.prim]p13: | |||
142 | // A lambda-expression appearing in a default argument shall not | |||
143 | // implicitly or explicitly capture any entity. | |||
144 | if (Lambda->capture_begin() == Lambda->capture_end()) | |||
145 | return false; | |||
146 | ||||
147 | return S->Diag(Lambda->getBeginLoc(), diag::err_lambda_capture_default_arg); | |||
148 | } | |||
149 | } | |||
150 | ||||
151 | void | |||
152 | Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, | |||
153 | const CXXMethodDecl *Method) { | |||
154 | // If we have an MSAny spec already, don't bother. | |||
155 | if (!Method || ComputedEST == EST_MSAny) | |||
156 | return; | |||
157 | ||||
158 | const FunctionProtoType *Proto | |||
159 | = Method->getType()->getAs<FunctionProtoType>(); | |||
160 | Proto = Self->ResolveExceptionSpec(CallLoc, Proto); | |||
161 | if (!Proto) | |||
162 | return; | |||
163 | ||||
164 | ExceptionSpecificationType EST = Proto->getExceptionSpecType(); | |||
165 | ||||
166 | // If we have a throw-all spec at this point, ignore the function. | |||
167 | if (ComputedEST == EST_None) | |||
168 | return; | |||
169 | ||||
170 | if (EST == EST_None && Method->hasAttr<NoThrowAttr>()) | |||
171 | EST = EST_BasicNoexcept; | |||
172 | ||||
173 | switch (EST) { | |||
174 | case EST_Unparsed: | |||
175 | case EST_Uninstantiated: | |||
176 | case EST_Unevaluated: | |||
177 | llvm_unreachable("should not see unresolved exception specs here")::llvm::llvm_unreachable_internal("should not see unresolved exception specs here" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 177); | |||
178 | ||||
179 | // If this function can throw any exceptions, make a note of that. | |||
180 | case EST_MSAny: | |||
181 | case EST_None: | |||
182 | // FIXME: Whichever we see last of MSAny and None determines our result. | |||
183 | // We should make a consistent, order-independent choice here. | |||
184 | ClearExceptions(); | |||
185 | ComputedEST = EST; | |||
186 | return; | |||
187 | case EST_NoexceptFalse: | |||
188 | ClearExceptions(); | |||
189 | ComputedEST = EST_None; | |||
190 | return; | |||
191 | // FIXME: If the call to this decl is using any of its default arguments, we | |||
192 | // need to search them for potentially-throwing calls. | |||
193 | // If this function has a basic noexcept, it doesn't affect the outcome. | |||
194 | case EST_BasicNoexcept: | |||
195 | case EST_NoexceptTrue: | |||
196 | case EST_NoThrow: | |||
197 | return; | |||
198 | // If we're still at noexcept(true) and there's a throw() callee, | |||
199 | // change to that specification. | |||
200 | case EST_DynamicNone: | |||
201 | if (ComputedEST == EST_BasicNoexcept) | |||
202 | ComputedEST = EST_DynamicNone; | |||
203 | return; | |||
204 | case EST_DependentNoexcept: | |||
205 | llvm_unreachable(::llvm::llvm_unreachable_internal("should not generate implicit declarations for dependent cases" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 206) | |||
206 | "should not generate implicit declarations for dependent cases")::llvm::llvm_unreachable_internal("should not generate implicit declarations for dependent cases" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 206); | |||
207 | case EST_Dynamic: | |||
208 | break; | |||
209 | } | |||
210 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 210, __PRETTY_FUNCTION__)); | |||
211 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 212, __PRETTY_FUNCTION__)) | |||
212 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 212, __PRETTY_FUNCTION__)); | |||
213 | ComputedEST = EST_Dynamic; | |||
214 | // Record the exceptions in this function's exception specification. | |||
215 | for (const auto &E : Proto->exceptions()) | |||
216 | if (ExceptionsSeen.insert(Self->Context.getCanonicalType(E)).second) | |||
217 | Exceptions.push_back(E); | |||
218 | } | |||
219 | ||||
220 | void Sema::ImplicitExceptionSpecification::CalledStmt(Stmt *S) { | |||
221 | if (!S || ComputedEST == EST_MSAny) | |||
222 | return; | |||
223 | ||||
224 | // FIXME: | |||
225 | // | |||
226 | // C++0x [except.spec]p14: | |||
227 | // [An] implicit exception-specification specifies the type-id T if and | |||
228 | // only if T is allowed by the exception-specification of a function directly | |||
229 | // invoked by f's implicit definition; f shall allow all exceptions if any | |||
230 | // function it directly invokes allows all exceptions, and f shall allow no | |||
231 | // exceptions if every function it directly invokes allows no exceptions. | |||
232 | // | |||
233 | // Note in particular that if an implicit exception-specification is generated | |||
234 | // for a function containing a throw-expression, that specification can still | |||
235 | // be noexcept(true). | |||
236 | // | |||
237 | // Note also that 'directly invoked' is not defined in the standard, and there | |||
238 | // is no indication that we should only consider potentially-evaluated calls. | |||
239 | // | |||
240 | // Ultimately we should implement the intent of the standard: the exception | |||
241 | // specification should be the set of exceptions which can be thrown by the | |||
242 | // implicit definition. For now, we assume that any non-nothrow expression can | |||
243 | // throw any exception. | |||
244 | ||||
245 | if (Self->canThrow(S)) | |||
246 | ComputedEST = EST_None; | |||
247 | } | |||
248 | ||||
249 | bool | |||
250 | Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, | |||
251 | SourceLocation EqualLoc) { | |||
252 | if (RequireCompleteType(Param->getLocation(), Param->getType(), | |||
253 | diag::err_typecheck_decl_incomplete_type)) { | |||
254 | Param->setInvalidDecl(); | |||
255 | return true; | |||
256 | } | |||
257 | ||||
258 | // C++ [dcl.fct.default]p5 | |||
259 | // A default argument expression is implicitly converted (clause | |||
260 | // 4) to the parameter type. The default argument expression has | |||
261 | // the same semantic constraints as the initializer expression in | |||
262 | // a declaration of a variable of the parameter type, using the | |||
263 | // copy-initialization semantics (8.5). | |||
264 | InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, | |||
265 | Param); | |||
266 | InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), | |||
267 | EqualLoc); | |||
268 | InitializationSequence InitSeq(*this, Entity, Kind, Arg); | |||
269 | ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); | |||
270 | if (Result.isInvalid()) | |||
271 | return true; | |||
272 | Arg = Result.getAs<Expr>(); | |||
273 | ||||
274 | CheckCompletedExpr(Arg, EqualLoc); | |||
275 | Arg = MaybeCreateExprWithCleanups(Arg); | |||
276 | ||||
277 | // Okay: add the default argument to the parameter | |||
278 | Param->setDefaultArg(Arg); | |||
279 | ||||
280 | // We have already instantiated this parameter; provide each of the | |||
281 | // instantiations with the uninstantiated default argument. | |||
282 | UnparsedDefaultArgInstantiationsMap::iterator InstPos | |||
283 | = UnparsedDefaultArgInstantiations.find(Param); | |||
284 | if (InstPos != UnparsedDefaultArgInstantiations.end()) { | |||
285 | for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) | |||
286 | InstPos->second[I]->setUninstantiatedDefaultArg(Arg); | |||
287 | ||||
288 | // We're done tracking this parameter's instantiations. | |||
289 | UnparsedDefaultArgInstantiations.erase(InstPos); | |||
290 | } | |||
291 | ||||
292 | return false; | |||
293 | } | |||
294 | ||||
295 | /// ActOnParamDefaultArgument - Check whether the default argument | |||
296 | /// provided for a function parameter is well-formed. If so, attach it | |||
297 | /// to the parameter declaration. | |||
298 | void | |||
299 | Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, | |||
300 | Expr *DefaultArg) { | |||
301 | if (!param || !DefaultArg) | |||
302 | return; | |||
303 | ||||
304 | ParmVarDecl *Param = cast<ParmVarDecl>(param); | |||
305 | UnparsedDefaultArgLocs.erase(Param); | |||
306 | ||||
307 | // Default arguments are only permitted in C++ | |||
308 | if (!getLangOpts().CPlusPlus) { | |||
309 | Diag(EqualLoc, diag::err_param_default_argument) | |||
310 | << DefaultArg->getSourceRange(); | |||
311 | Param->setInvalidDecl(); | |||
312 | return; | |||
313 | } | |||
314 | ||||
315 | // Check for unexpanded parameter packs. | |||
316 | if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { | |||
317 | Param->setInvalidDecl(); | |||
318 | return; | |||
319 | } | |||
320 | ||||
321 | // C++11 [dcl.fct.default]p3 | |||
322 | // A default argument expression [...] shall not be specified for a | |||
323 | // parameter pack. | |||
324 | if (Param->isParameterPack()) { | |||
325 | Diag(EqualLoc, diag::err_param_default_argument_on_parameter_pack) | |||
326 | << DefaultArg->getSourceRange(); | |||
327 | return; | |||
328 | } | |||
329 | ||||
330 | // Check that the default argument is well-formed | |||
331 | CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); | |||
332 | if (DefaultArgChecker.Visit(DefaultArg)) { | |||
333 | Param->setInvalidDecl(); | |||
334 | return; | |||
335 | } | |||
336 | ||||
337 | SetParamDefaultArgument(Param, DefaultArg, EqualLoc); | |||
338 | } | |||
339 | ||||
340 | /// ActOnParamUnparsedDefaultArgument - We've seen a default | |||
341 | /// argument for a function parameter, but we can't parse it yet | |||
342 | /// because we're inside a class definition. Note that this default | |||
343 | /// argument will be parsed later. | |||
344 | void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, | |||
345 | SourceLocation EqualLoc, | |||
346 | SourceLocation ArgLoc) { | |||
347 | if (!param) | |||
348 | return; | |||
349 | ||||
350 | ParmVarDecl *Param = cast<ParmVarDecl>(param); | |||
351 | Param->setUnparsedDefaultArg(); | |||
352 | UnparsedDefaultArgLocs[Param] = ArgLoc; | |||
353 | } | |||
354 | ||||
355 | /// ActOnParamDefaultArgumentError - Parsing or semantic analysis of | |||
356 | /// the default argument for the parameter param failed. | |||
357 | void Sema::ActOnParamDefaultArgumentError(Decl *param, | |||
358 | SourceLocation EqualLoc) { | |||
359 | if (!param) | |||
360 | return; | |||
361 | ||||
362 | ParmVarDecl *Param = cast<ParmVarDecl>(param); | |||
363 | Param->setInvalidDecl(); | |||
364 | UnparsedDefaultArgLocs.erase(Param); | |||
365 | Param->setDefaultArg(new(Context) | |||
366 | OpaqueValueExpr(EqualLoc, | |||
367 | Param->getType().getNonReferenceType(), | |||
368 | VK_RValue)); | |||
369 | } | |||
370 | ||||
371 | /// CheckExtraCXXDefaultArguments - Check for any extra default | |||
372 | /// arguments in the declarator, which is not a function declaration | |||
373 | /// or definition and therefore is not permitted to have default | |||
374 | /// arguments. This routine should be invoked for every declarator | |||
375 | /// that is not a function declaration or definition. | |||
376 | void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { | |||
377 | // C++ [dcl.fct.default]p3 | |||
378 | // A default argument expression shall be specified only in the | |||
379 | // parameter-declaration-clause of a function declaration or in a | |||
380 | // template-parameter (14.1). It shall not be specified for a | |||
381 | // parameter pack. If it is specified in a | |||
382 | // parameter-declaration-clause, it shall not occur within a | |||
383 | // declarator or abstract-declarator of a parameter-declaration. | |||
384 | bool MightBeFunction = D.isFunctionDeclarationContext(); | |||
385 | for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { | |||
386 | DeclaratorChunk &chunk = D.getTypeObject(i); | |||
387 | if (chunk.Kind == DeclaratorChunk::Function) { | |||
388 | if (MightBeFunction) { | |||
389 | // This is a function declaration. It can have default arguments, but | |||
390 | // keep looking in case its return type is a function type with default | |||
391 | // arguments. | |||
392 | MightBeFunction = false; | |||
393 | continue; | |||
394 | } | |||
395 | for (unsigned argIdx = 0, e = chunk.Fun.NumParams; argIdx != e; | |||
396 | ++argIdx) { | |||
397 | ParmVarDecl *Param = cast<ParmVarDecl>(chunk.Fun.Params[argIdx].Param); | |||
398 | if (Param->hasUnparsedDefaultArg()) { | |||
399 | std::unique_ptr<CachedTokens> Toks = | |||
400 | std::move(chunk.Fun.Params[argIdx].DefaultArgTokens); | |||
401 | SourceRange SR; | |||
402 | if (Toks->size() > 1) | |||
403 | SR = SourceRange((*Toks)[1].getLocation(), | |||
404 | Toks->back().getLocation()); | |||
405 | else | |||
406 | SR = UnparsedDefaultArgLocs[Param]; | |||
407 | Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) | |||
408 | << SR; | |||
409 | } else if (Param->getDefaultArg()) { | |||
410 | Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) | |||
411 | << Param->getDefaultArg()->getSourceRange(); | |||
412 | Param->setDefaultArg(nullptr); | |||
413 | } | |||
414 | } | |||
415 | } else if (chunk.Kind != DeclaratorChunk::Paren) { | |||
416 | MightBeFunction = false; | |||
417 | } | |||
418 | } | |||
419 | } | |||
420 | ||||
421 | static bool functionDeclHasDefaultArgument(const FunctionDecl *FD) { | |||
422 | for (unsigned NumParams = FD->getNumParams(); NumParams > 0; --NumParams) { | |||
423 | const ParmVarDecl *PVD = FD->getParamDecl(NumParams-1); | |||
424 | if (!PVD->hasDefaultArg()) | |||
425 | return false; | |||
426 | if (!PVD->hasInheritedDefaultArg()) | |||
427 | return true; | |||
428 | } | |||
429 | return false; | |||
430 | } | |||
431 | ||||
432 | /// MergeCXXFunctionDecl - Merge two declarations of the same C++ | |||
433 | /// function, once we already know that they have the same | |||
434 | /// type. Subroutine of MergeFunctionDecl. Returns true if there was an | |||
435 | /// error, false otherwise. | |||
436 | bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, | |||
437 | Scope *S) { | |||
438 | bool Invalid = false; | |||
439 | ||||
440 | // The declaration context corresponding to the scope is the semantic | |||
441 | // parent, unless this is a local function declaration, in which case | |||
442 | // it is that surrounding function. | |||
443 | DeclContext *ScopeDC = New->isLocalExternDecl() | |||
444 | ? New->getLexicalDeclContext() | |||
445 | : New->getDeclContext(); | |||
446 | ||||
447 | // Find the previous declaration for the purpose of default arguments. | |||
448 | FunctionDecl *PrevForDefaultArgs = Old; | |||
449 | for (/**/; PrevForDefaultArgs; | |||
450 | // Don't bother looking back past the latest decl if this is a local | |||
451 | // extern declaration; nothing else could work. | |||
452 | PrevForDefaultArgs = New->isLocalExternDecl() | |||
453 | ? nullptr | |||
454 | : PrevForDefaultArgs->getPreviousDecl()) { | |||
455 | // Ignore hidden declarations. | |||
456 | if (!LookupResult::isVisible(*this, PrevForDefaultArgs)) | |||
457 | continue; | |||
458 | ||||
459 | if (S && !isDeclInScope(PrevForDefaultArgs, ScopeDC, S) && | |||
460 | !New->isCXXClassMember()) { | |||
461 | // Ignore default arguments of old decl if they are not in | |||
462 | // the same scope and this is not an out-of-line definition of | |||
463 | // a member function. | |||
464 | continue; | |||
465 | } | |||
466 | ||||
467 | if (PrevForDefaultArgs->isLocalExternDecl() != New->isLocalExternDecl()) { | |||
468 | // If only one of these is a local function declaration, then they are | |||
469 | // declared in different scopes, even though isDeclInScope may think | |||
470 | // they're in the same scope. (If both are local, the scope check is | |||
471 | // sufficient, and if neither is local, then they are in the same scope.) | |||
472 | continue; | |||
473 | } | |||
474 | ||||
475 | // We found the right previous declaration. | |||
476 | break; | |||
477 | } | |||
478 | ||||
479 | // C++ [dcl.fct.default]p4: | |||
480 | // For non-template functions, default arguments can be added in | |||
481 | // later declarations of a function in the same | |||
482 | // scope. Declarations in different scopes have completely | |||
483 | // distinct sets of default arguments. That is, declarations in | |||
484 | // inner scopes do not acquire default arguments from | |||
485 | // declarations in outer scopes, and vice versa. In a given | |||
486 | // function declaration, all parameters subsequent to a | |||
487 | // parameter with a default argument shall have default | |||
488 | // arguments supplied in this or previous declarations. A | |||
489 | // default argument shall not be redefined by a later | |||
490 | // declaration (not even to the same value). | |||
491 | // | |||
492 | // C++ [dcl.fct.default]p6: | |||
493 | // Except for member functions of class templates, the default arguments | |||
494 | // in a member function definition that appears outside of the class | |||
495 | // definition are added to the set of default arguments provided by the | |||
496 | // member function declaration in the class definition. | |||
497 | for (unsigned p = 0, NumParams = PrevForDefaultArgs | |||
498 | ? PrevForDefaultArgs->getNumParams() | |||
499 | : 0; | |||
500 | p < NumParams; ++p) { | |||
501 | ParmVarDecl *OldParam = PrevForDefaultArgs->getParamDecl(p); | |||
502 | ParmVarDecl *NewParam = New->getParamDecl(p); | |||
503 | ||||
504 | bool OldParamHasDfl = OldParam ? OldParam->hasDefaultArg() : false; | |||
505 | bool NewParamHasDfl = NewParam->hasDefaultArg(); | |||
506 | ||||
507 | if (OldParamHasDfl && NewParamHasDfl) { | |||
508 | unsigned DiagDefaultParamID = | |||
509 | diag::err_param_default_argument_redefinition; | |||
510 | ||||
511 | // MSVC accepts that default parameters be redefined for member functions | |||
512 | // of template class. The new default parameter's value is ignored. | |||
513 | Invalid = true; | |||
514 | if (getLangOpts().MicrosoftExt) { | |||
515 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(New); | |||
516 | if (MD && MD->getParent()->getDescribedClassTemplate()) { | |||
517 | // Merge the old default argument into the new parameter. | |||
518 | NewParam->setHasInheritedDefaultArg(); | |||
519 | if (OldParam->hasUninstantiatedDefaultArg()) | |||
520 | NewParam->setUninstantiatedDefaultArg( | |||
521 | OldParam->getUninstantiatedDefaultArg()); | |||
522 | else | |||
523 | NewParam->setDefaultArg(OldParam->getInit()); | |||
524 | DiagDefaultParamID = diag::ext_param_default_argument_redefinition; | |||
525 | Invalid = false; | |||
526 | } | |||
527 | } | |||
528 | ||||
529 | // FIXME: If we knew where the '=' was, we could easily provide a fix-it | |||
530 | // hint here. Alternatively, we could walk the type-source information | |||
531 | // for NewParam to find the last source location in the type... but it | |||
532 | // isn't worth the effort right now. This is the kind of test case that | |||
533 | // is hard to get right: | |||
534 | // int f(int); | |||
535 | // void g(int (*fp)(int) = f); | |||
536 | // void g(int (*fp)(int) = &f); | |||
537 | Diag(NewParam->getLocation(), DiagDefaultParamID) | |||
538 | << NewParam->getDefaultArgRange(); | |||
539 | ||||
540 | // Look for the function declaration where the default argument was | |||
541 | // actually written, which may be a declaration prior to Old. | |||
542 | for (auto Older = PrevForDefaultArgs; | |||
543 | OldParam->hasInheritedDefaultArg(); /**/) { | |||
544 | Older = Older->getPreviousDecl(); | |||
545 | OldParam = Older->getParamDecl(p); | |||
546 | } | |||
547 | ||||
548 | Diag(OldParam->getLocation(), diag::note_previous_definition) | |||
549 | << OldParam->getDefaultArgRange(); | |||
550 | } else if (OldParamHasDfl) { | |||
551 | // Merge the old default argument into the new parameter unless the new | |||
552 | // function is a friend declaration in a template class. In the latter | |||
553 | // case the default arguments will be inherited when the friend | |||
554 | // declaration will be instantiated. | |||
555 | if (New->getFriendObjectKind() == Decl::FOK_None || | |||
556 | !New->getLexicalDeclContext()->isDependentContext()) { | |||
557 | // It's important to use getInit() here; getDefaultArg() | |||
558 | // strips off any top-level ExprWithCleanups. | |||
559 | NewParam->setHasInheritedDefaultArg(); | |||
560 | if (OldParam->hasUnparsedDefaultArg()) | |||
561 | NewParam->setUnparsedDefaultArg(); | |||
562 | else if (OldParam->hasUninstantiatedDefaultArg()) | |||
563 | NewParam->setUninstantiatedDefaultArg( | |||
564 | OldParam->getUninstantiatedDefaultArg()); | |||
565 | else | |||
566 | NewParam->setDefaultArg(OldParam->getInit()); | |||
567 | } | |||
568 | } else if (NewParamHasDfl) { | |||
569 | if (New->getDescribedFunctionTemplate()) { | |||
570 | // Paragraph 4, quoted above, only applies to non-template functions. | |||
571 | Diag(NewParam->getLocation(), | |||
572 | diag::err_param_default_argument_template_redecl) | |||
573 | << NewParam->getDefaultArgRange(); | |||
574 | Diag(PrevForDefaultArgs->getLocation(), | |||
575 | diag::note_template_prev_declaration) | |||
576 | << false; | |||
577 | } else if (New->getTemplateSpecializationKind() | |||
578 | != TSK_ImplicitInstantiation && | |||
579 | New->getTemplateSpecializationKind() != TSK_Undeclared) { | |||
580 | // C++ [temp.expr.spec]p21: | |||
581 | // Default function arguments shall not be specified in a declaration | |||
582 | // or a definition for one of the following explicit specializations: | |||
583 | // - the explicit specialization of a function template; | |||
584 | // - the explicit specialization of a member function template; | |||
585 | // - the explicit specialization of a member function of a class | |||
586 | // template where the class template specialization to which the | |||
587 | // member function specialization belongs is implicitly | |||
588 | // instantiated. | |||
589 | Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) | |||
590 | << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) | |||
591 | << New->getDeclName() | |||
592 | << NewParam->getDefaultArgRange(); | |||
593 | } else if (New->getDeclContext()->isDependentContext()) { | |||
594 | // C++ [dcl.fct.default]p6 (DR217): | |||
595 | // Default arguments for a member function of a class template shall | |||
596 | // be specified on the initial declaration of the member function | |||
597 | // within the class template. | |||
598 | // | |||
599 | // Reading the tea leaves a bit in DR217 and its reference to DR205 | |||
600 | // leads me to the conclusion that one cannot add default function | |||
601 | // arguments for an out-of-line definition of a member function of a | |||
602 | // dependent type. | |||
603 | int WhichKind = 2; | |||
604 | if (CXXRecordDecl *Record | |||
605 | = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { | |||
606 | if (Record->getDescribedClassTemplate()) | |||
607 | WhichKind = 0; | |||
608 | else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) | |||
609 | WhichKind = 1; | |||
610 | else | |||
611 | WhichKind = 2; | |||
612 | } | |||
613 | ||||
614 | Diag(NewParam->getLocation(), | |||
615 | diag::err_param_default_argument_member_template_redecl) | |||
616 | << WhichKind | |||
617 | << NewParam->getDefaultArgRange(); | |||
618 | } | |||
619 | } | |||
620 | } | |||
621 | ||||
622 | // DR1344: If a default argument is added outside a class definition and that | |||
623 | // default argument makes the function a special member function, the program | |||
624 | // is ill-formed. This can only happen for constructors. | |||
625 | if (isa<CXXConstructorDecl>(New) && | |||
626 | New->getMinRequiredArguments() < Old->getMinRequiredArguments()) { | |||
627 | CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)), | |||
628 | OldSM = getSpecialMember(cast<CXXMethodDecl>(Old)); | |||
629 | if (NewSM != OldSM) { | |||
630 | ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments()); | |||
631 | assert(NewParam->hasDefaultArg())((NewParam->hasDefaultArg()) ? static_cast<void> (0) : __assert_fail ("NewParam->hasDefaultArg()", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 631, __PRETTY_FUNCTION__)); | |||
632 | Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special) | |||
633 | << NewParam->getDefaultArgRange() << NewSM; | |||
634 | Diag(Old->getLocation(), diag::note_previous_declaration); | |||
635 | } | |||
636 | } | |||
637 | ||||
638 | const FunctionDecl *Def; | |||
639 | // C++11 [dcl.constexpr]p1: If any declaration of a function or function | |||
640 | // template has a constexpr specifier then all its declarations shall | |||
641 | // contain the constexpr specifier. | |||
642 | if (New->getConstexprKind() != Old->getConstexprKind()) { | |||
643 | Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) | |||
644 | << New << New->getConstexprKind() << Old->getConstexprKind(); | |||
645 | Diag(Old->getLocation(), diag::note_previous_declaration); | |||
646 | Invalid = true; | |||
647 | } else if (!Old->getMostRecentDecl()->isInlined() && New->isInlined() && | |||
648 | Old->isDefined(Def) && | |||
649 | // If a friend function is inlined but does not have 'inline' | |||
650 | // specifier, it is a definition. Do not report attribute conflict | |||
651 | // in this case, redefinition will be diagnosed later. | |||
652 | (New->isInlineSpecified() || | |||
653 | New->getFriendObjectKind() == Decl::FOK_None)) { | |||
654 | // C++11 [dcl.fcn.spec]p4: | |||
655 | // If the definition of a function appears in a translation unit before its | |||
656 | // first declaration as inline, the program is ill-formed. | |||
657 | Diag(New->getLocation(), diag::err_inline_decl_follows_def) << New; | |||
658 | Diag(Def->getLocation(), diag::note_previous_definition); | |||
659 | Invalid = true; | |||
660 | } | |||
661 | ||||
662 | // C++17 [temp.deduct.guide]p3: | |||
663 | // Two deduction guide declarations in the same translation unit | |||
664 | // for the same class template shall not have equivalent | |||
665 | // parameter-declaration-clauses. | |||
666 | if (isa<CXXDeductionGuideDecl>(New) && | |||
667 | !New->isFunctionTemplateSpecialization()) { | |||
668 | Diag(New->getLocation(), diag::err_deduction_guide_redeclared); | |||
669 | Diag(Old->getLocation(), diag::note_previous_declaration); | |||
670 | } | |||
671 | ||||
672 | // C++11 [dcl.fct.default]p4: If a friend declaration specifies a default | |||
673 | // argument expression, that declaration shall be a definition and shall be | |||
674 | // the only declaration of the function or function template in the | |||
675 | // translation unit. | |||
676 | if (Old->getFriendObjectKind() == Decl::FOK_Undeclared && | |||
677 | functionDeclHasDefaultArgument(Old)) { | |||
678 | Diag(New->getLocation(), diag::err_friend_decl_with_def_arg_redeclared); | |||
679 | Diag(Old->getLocation(), diag::note_previous_declaration); | |||
680 | Invalid = true; | |||
681 | } | |||
682 | ||||
683 | return Invalid; | |||
684 | } | |||
685 | ||||
686 | NamedDecl * | |||
687 | Sema::ActOnDecompositionDeclarator(Scope *S, Declarator &D, | |||
688 | MultiTemplateParamsArg TemplateParamLists) { | |||
689 | assert(D.isDecompositionDeclarator())((D.isDecompositionDeclarator()) ? static_cast<void> (0 ) : __assert_fail ("D.isDecompositionDeclarator()", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 689, __PRETTY_FUNCTION__)); | |||
690 | const DecompositionDeclarator &Decomp = D.getDecompositionDeclarator(); | |||
691 | ||||
692 | // The syntax only allows a decomposition declarator as a simple-declaration, | |||
693 | // a for-range-declaration, or a condition in Clang, but we parse it in more | |||
694 | // cases than that. | |||
695 | if (!D.mayHaveDecompositionDeclarator()) { | |||
696 | Diag(Decomp.getLSquareLoc(), diag::err_decomp_decl_context) | |||
697 | << Decomp.getSourceRange(); | |||
698 | return nullptr; | |||
699 | } | |||
700 | ||||
701 | if (!TemplateParamLists.empty()) { | |||
702 | // FIXME: There's no rule against this, but there are also no rules that | |||
703 | // would actually make it usable, so we reject it for now. | |||
704 | Diag(TemplateParamLists.front()->getTemplateLoc(), | |||
705 | diag::err_decomp_decl_template); | |||
706 | return nullptr; | |||
707 | } | |||
708 | ||||
709 | Diag(Decomp.getLSquareLoc(), | |||
710 | !getLangOpts().CPlusPlus17 | |||
711 | ? diag::ext_decomp_decl | |||
712 | : D.getContext() == DeclaratorContext::ConditionContext | |||
713 | ? diag::ext_decomp_decl_cond | |||
714 | : diag::warn_cxx14_compat_decomp_decl) | |||
715 | << Decomp.getSourceRange(); | |||
716 | ||||
717 | // The semantic context is always just the current context. | |||
718 | DeclContext *const DC = CurContext; | |||
719 | ||||
720 | // C++17 [dcl.dcl]/8: | |||
721 | // The decl-specifier-seq shall contain only the type-specifier auto | |||
722 | // and cv-qualifiers. | |||
723 | // C++2a [dcl.dcl]/8: | |||
724 | // If decl-specifier-seq contains any decl-specifier other than static, | |||
725 | // thread_local, auto, or cv-qualifiers, the program is ill-formed. | |||
726 | auto &DS = D.getDeclSpec(); | |||
727 | { | |||
728 | SmallVector<StringRef, 8> BadSpecifiers; | |||
729 | SmallVector<SourceLocation, 8> BadSpecifierLocs; | |||
730 | SmallVector<StringRef, 8> CPlusPlus20Specifiers; | |||
731 | SmallVector<SourceLocation, 8> CPlusPlus20SpecifierLocs; | |||
732 | if (auto SCS = DS.getStorageClassSpec()) { | |||
733 | if (SCS == DeclSpec::SCS_static) { | |||
734 | CPlusPlus20Specifiers.push_back(DeclSpec::getSpecifierName(SCS)); | |||
735 | CPlusPlus20SpecifierLocs.push_back(DS.getStorageClassSpecLoc()); | |||
736 | } else { | |||
737 | BadSpecifiers.push_back(DeclSpec::getSpecifierName(SCS)); | |||
738 | BadSpecifierLocs.push_back(DS.getStorageClassSpecLoc()); | |||
739 | } | |||
740 | } | |||
741 | if (auto TSCS = DS.getThreadStorageClassSpec()) { | |||
742 | CPlusPlus20Specifiers.push_back(DeclSpec::getSpecifierName(TSCS)); | |||
743 | CPlusPlus20SpecifierLocs.push_back(DS.getThreadStorageClassSpecLoc()); | |||
744 | } | |||
745 | if (DS.hasConstexprSpecifier()) { | |||
746 | BadSpecifiers.push_back( | |||
747 | DeclSpec::getSpecifierName(DS.getConstexprSpecifier())); | |||
748 | BadSpecifierLocs.push_back(DS.getConstexprSpecLoc()); | |||
749 | } | |||
750 | if (DS.isInlineSpecified()) { | |||
751 | BadSpecifiers.push_back("inline"); | |||
752 | BadSpecifierLocs.push_back(DS.getInlineSpecLoc()); | |||
753 | } | |||
754 | if (!BadSpecifiers.empty()) { | |||
755 | auto &&Err = Diag(BadSpecifierLocs.front(), diag::err_decomp_decl_spec); | |||
756 | Err << (int)BadSpecifiers.size() | |||
757 | << llvm::join(BadSpecifiers.begin(), BadSpecifiers.end(), " "); | |||
758 | // Don't add FixItHints to remove the specifiers; we do still respect | |||
759 | // them when building the underlying variable. | |||
760 | for (auto Loc : BadSpecifierLocs) | |||
761 | Err << SourceRange(Loc, Loc); | |||
762 | } else if (!CPlusPlus20Specifiers.empty()) { | |||
763 | auto &&Warn = Diag(CPlusPlus20SpecifierLocs.front(), | |||
764 | getLangOpts().CPlusPlus2a | |||
765 | ? diag::warn_cxx17_compat_decomp_decl_spec | |||
766 | : diag::ext_decomp_decl_spec); | |||
767 | Warn << (int)CPlusPlus20Specifiers.size() | |||
768 | << llvm::join(CPlusPlus20Specifiers.begin(), | |||
769 | CPlusPlus20Specifiers.end(), " "); | |||
770 | for (auto Loc : CPlusPlus20SpecifierLocs) | |||
771 | Warn << SourceRange(Loc, Loc); | |||
772 | } | |||
773 | // We can't recover from it being declared as a typedef. | |||
774 | if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) | |||
775 | return nullptr; | |||
776 | } | |||
777 | ||||
778 | // C++2a [dcl.struct.bind]p1: | |||
779 | // A cv that includes volatile is deprecated | |||
780 | if ((DS.getTypeQualifiers() & DeclSpec::TQ_volatile) && | |||
781 | getLangOpts().CPlusPlus2a) | |||
782 | Diag(DS.getVolatileSpecLoc(), | |||
783 | diag::warn_deprecated_volatile_structured_binding); | |||
784 | ||||
785 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); | |||
786 | QualType R = TInfo->getType(); | |||
787 | ||||
788 | if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, | |||
789 | UPPC_DeclarationType)) | |||
790 | D.setInvalidType(); | |||
791 | ||||
792 | // The syntax only allows a single ref-qualifier prior to the decomposition | |||
793 | // declarator. No other declarator chunks are permitted. Also check the type | |||
794 | // specifier here. | |||
795 | if (DS.getTypeSpecType() != DeclSpec::TST_auto || | |||
796 | D.hasGroupingParens() || D.getNumTypeObjects() > 1 || | |||
797 | (D.getNumTypeObjects() == 1 && | |||
798 | D.getTypeObject(0).Kind != DeclaratorChunk::Reference)) { | |||
799 | Diag(Decomp.getLSquareLoc(), | |||
800 | (D.hasGroupingParens() || | |||
801 | (D.getNumTypeObjects() && | |||
802 | D.getTypeObject(0).Kind == DeclaratorChunk::Paren)) | |||
803 | ? diag::err_decomp_decl_parens | |||
804 | : diag::err_decomp_decl_type) | |||
805 | << R; | |||
806 | ||||
807 | // In most cases, there's no actual problem with an explicitly-specified | |||
808 | // type, but a function type won't work here, and ActOnVariableDeclarator | |||
809 | // shouldn't be called for such a type. | |||
810 | if (R->isFunctionType()) | |||
811 | D.setInvalidType(); | |||
812 | } | |||
813 | ||||
814 | // Build the BindingDecls. | |||
815 | SmallVector<BindingDecl*, 8> Bindings; | |||
816 | ||||
817 | // Build the BindingDecls. | |||
818 | for (auto &B : D.getDecompositionDeclarator().bindings()) { | |||
819 | // Check for name conflicts. | |||
820 | DeclarationNameInfo NameInfo(B.Name, B.NameLoc); | |||
821 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, | |||
822 | ForVisibleRedeclaration); | |||
823 | LookupName(Previous, S, | |||
824 | /*CreateBuiltins*/DC->getRedeclContext()->isTranslationUnit()); | |||
825 | ||||
826 | // It's not permitted to shadow a template parameter name. | |||
827 | if (Previous.isSingleResult() && | |||
828 | Previous.getFoundDecl()->isTemplateParameter()) { | |||
829 | DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), | |||
830 | Previous.getFoundDecl()); | |||
831 | Previous.clear(); | |||
832 | } | |||
833 | ||||
834 | bool ConsiderLinkage = DC->isFunctionOrMethod() && | |||
835 | DS.getStorageClassSpec() == DeclSpec::SCS_extern; | |||
836 | FilterLookupForScope(Previous, DC, S, ConsiderLinkage, | |||
837 | /*AllowInlineNamespace*/false); | |||
838 | if (!Previous.empty()) { | |||
839 | auto *Old = Previous.getRepresentativeDecl(); | |||
840 | Diag(B.NameLoc, diag::err_redefinition) << B.Name; | |||
841 | Diag(Old->getLocation(), diag::note_previous_definition); | |||
842 | } | |||
843 | ||||
844 | auto *BD = BindingDecl::Create(Context, DC, B.NameLoc, B.Name); | |||
845 | PushOnScopeChains(BD, S, true); | |||
846 | Bindings.push_back(BD); | |||
847 | ParsingInitForAutoVars.insert(BD); | |||
848 | } | |||
849 | ||||
850 | // There are no prior lookup results for the variable itself, because it | |||
851 | // is unnamed. | |||
852 | DeclarationNameInfo NameInfo((IdentifierInfo *)nullptr, | |||
853 | Decomp.getLSquareLoc()); | |||
854 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, | |||
855 | ForVisibleRedeclaration); | |||
856 | ||||
857 | // Build the variable that holds the non-decomposed object. | |||
858 | bool AddToScope = true; | |||
859 | NamedDecl *New = | |||
860 | ActOnVariableDeclarator(S, D, DC, TInfo, Previous, | |||
861 | MultiTemplateParamsArg(), AddToScope, Bindings); | |||
862 | if (AddToScope) { | |||
863 | S->AddDecl(New); | |||
864 | CurContext->addHiddenDecl(New); | |||
865 | } | |||
866 | ||||
867 | if (isInOpenMPDeclareTargetContext()) | |||
868 | checkDeclIsAllowedInOpenMPTarget(nullptr, New); | |||
869 | ||||
870 | return New; | |||
871 | } | |||
872 | ||||
873 | static bool checkSimpleDecomposition( | |||
874 | Sema &S, ArrayRef<BindingDecl *> Bindings, ValueDecl *Src, | |||
875 | QualType DecompType, const llvm::APSInt &NumElems, QualType ElemType, | |||
876 | llvm::function_ref<ExprResult(SourceLocation, Expr *, unsigned)> GetInit) { | |||
877 | if ((int64_t)Bindings.size() != NumElems) { | |||
878 | S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings) | |||
879 | << DecompType << (unsigned)Bindings.size() << NumElems.toString(10) | |||
880 | << (NumElems < Bindings.size()); | |||
881 | return true; | |||
882 | } | |||
883 | ||||
884 | unsigned I = 0; | |||
885 | for (auto *B : Bindings) { | |||
886 | SourceLocation Loc = B->getLocation(); | |||
887 | ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc); | |||
888 | if (E.isInvalid()) | |||
889 | return true; | |||
890 | E = GetInit(Loc, E.get(), I++); | |||
891 | if (E.isInvalid()) | |||
892 | return true; | |||
893 | B->setBinding(ElemType, E.get()); | |||
894 | } | |||
895 | ||||
896 | return false; | |||
897 | } | |||
898 | ||||
899 | static bool checkArrayLikeDecomposition(Sema &S, | |||
900 | ArrayRef<BindingDecl *> Bindings, | |||
901 | ValueDecl *Src, QualType DecompType, | |||
902 | const llvm::APSInt &NumElems, | |||
903 | QualType ElemType) { | |||
904 | return checkSimpleDecomposition( | |||
905 | S, Bindings, Src, DecompType, NumElems, ElemType, | |||
906 | [&](SourceLocation Loc, Expr *Base, unsigned I) -> ExprResult { | |||
907 | ExprResult E = S.ActOnIntegerConstant(Loc, I); | |||
908 | if (E.isInvalid()) | |||
909 | return ExprError(); | |||
910 | return S.CreateBuiltinArraySubscriptExpr(Base, Loc, E.get(), Loc); | |||
911 | }); | |||
912 | } | |||
913 | ||||
914 | static bool checkArrayDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings, | |||
915 | ValueDecl *Src, QualType DecompType, | |||
916 | const ConstantArrayType *CAT) { | |||
917 | return checkArrayLikeDecomposition(S, Bindings, Src, DecompType, | |||
918 | llvm::APSInt(CAT->getSize()), | |||
919 | CAT->getElementType()); | |||
920 | } | |||
921 | ||||
922 | static bool checkVectorDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings, | |||
923 | ValueDecl *Src, QualType DecompType, | |||
924 | const VectorType *VT) { | |||
925 | return checkArrayLikeDecomposition( | |||
926 | S, Bindings, Src, DecompType, llvm::APSInt::get(VT->getNumElements()), | |||
927 | S.Context.getQualifiedType(VT->getElementType(), | |||
928 | DecompType.getQualifiers())); | |||
929 | } | |||
930 | ||||
931 | static bool checkComplexDecomposition(Sema &S, | |||
932 | ArrayRef<BindingDecl *> Bindings, | |||
933 | ValueDecl *Src, QualType DecompType, | |||
934 | const ComplexType *CT) { | |||
935 | return checkSimpleDecomposition( | |||
936 | S, Bindings, Src, DecompType, llvm::APSInt::get(2), | |||
937 | S.Context.getQualifiedType(CT->getElementType(), | |||
938 | DecompType.getQualifiers()), | |||
939 | [&](SourceLocation Loc, Expr *Base, unsigned I) -> ExprResult { | |||
940 | return S.CreateBuiltinUnaryOp(Loc, I ? UO_Imag : UO_Real, Base); | |||
941 | }); | |||
942 | } | |||
943 | ||||
944 | static std::string printTemplateArgs(const PrintingPolicy &PrintingPolicy, | |||
945 | TemplateArgumentListInfo &Args) { | |||
946 | SmallString<128> SS; | |||
947 | llvm::raw_svector_ostream OS(SS); | |||
948 | bool First = true; | |||
949 | for (auto &Arg : Args.arguments()) { | |||
950 | if (!First) | |||
951 | OS << ", "; | |||
952 | Arg.getArgument().print(PrintingPolicy, OS); | |||
953 | First = false; | |||
954 | } | |||
955 | return std::string(OS.str()); | |||
956 | } | |||
957 | ||||
958 | static bool lookupStdTypeTraitMember(Sema &S, LookupResult &TraitMemberLookup, | |||
959 | SourceLocation Loc, StringRef Trait, | |||
960 | TemplateArgumentListInfo &Args, | |||
961 | unsigned DiagID) { | |||
962 | auto DiagnoseMissing = [&] { | |||
963 | if (DiagID) | |||
964 | S.Diag(Loc, DiagID) << printTemplateArgs(S.Context.getPrintingPolicy(), | |||
965 | Args); | |||
966 | return true; | |||
967 | }; | |||
968 | ||||
969 | // FIXME: Factor out duplication with lookupPromiseType in SemaCoroutine. | |||
970 | NamespaceDecl *Std = S.getStdNamespace(); | |||
971 | if (!Std) | |||
972 | return DiagnoseMissing(); | |||
973 | ||||
974 | // Look up the trait itself, within namespace std. We can diagnose various | |||
975 | // problems with this lookup even if we've been asked to not diagnose a | |||
976 | // missing specialization, because this can only fail if the user has been | |||
977 | // declaring their own names in namespace std or we don't support the | |||
978 | // standard library implementation in use. | |||
979 | LookupResult Result(S, &S.PP.getIdentifierTable().get(Trait), | |||
980 | Loc, Sema::LookupOrdinaryName); | |||
981 | if (!S.LookupQualifiedName(Result, Std)) | |||
982 | return DiagnoseMissing(); | |||
983 | if (Result.isAmbiguous()) | |||
984 | return true; | |||
985 | ||||
986 | ClassTemplateDecl *TraitTD = Result.getAsSingle<ClassTemplateDecl>(); | |||
987 | if (!TraitTD) { | |||
988 | Result.suppressDiagnostics(); | |||
989 | NamedDecl *Found = *Result.begin(); | |||
990 | S.Diag(Loc, diag::err_std_type_trait_not_class_template) << Trait; | |||
991 | S.Diag(Found->getLocation(), diag::note_declared_at); | |||
992 | return true; | |||
993 | } | |||
994 | ||||
995 | // Build the template-id. | |||
996 | QualType TraitTy = S.CheckTemplateIdType(TemplateName(TraitTD), Loc, Args); | |||
997 | if (TraitTy.isNull()) | |||
998 | return true; | |||
999 | if (!S.isCompleteType(Loc, TraitTy)) { | |||
1000 | if (DiagID) | |||
1001 | S.RequireCompleteType( | |||
1002 | Loc, TraitTy, DiagID, | |||
1003 | printTemplateArgs(S.Context.getPrintingPolicy(), Args)); | |||
1004 | return true; | |||
1005 | } | |||
1006 | ||||
1007 | CXXRecordDecl *RD = TraitTy->getAsCXXRecordDecl(); | |||
1008 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 1008, __PRETTY_FUNCTION__)); | |||
1009 | ||||
1010 | // Look up the member of the trait type. | |||
1011 | S.LookupQualifiedName(TraitMemberLookup, RD); | |||
1012 | return TraitMemberLookup.isAmbiguous(); | |||
1013 | } | |||
1014 | ||||
1015 | static TemplateArgumentLoc | |||
1016 | getTrivialIntegralTemplateArgument(Sema &S, SourceLocation Loc, QualType T, | |||
1017 | uint64_t I) { | |||
1018 | TemplateArgument Arg(S.Context, S.Context.MakeIntValue(I, T), T); | |||
1019 | return S.getTrivialTemplateArgumentLoc(Arg, T, Loc); | |||
1020 | } | |||
1021 | ||||
1022 | static TemplateArgumentLoc | |||
1023 | getTrivialTypeTemplateArgument(Sema &S, SourceLocation Loc, QualType T) { | |||
1024 | return S.getTrivialTemplateArgumentLoc(TemplateArgument(T), QualType(), Loc); | |||
1025 | } | |||
1026 | ||||
1027 | namespace { enum class IsTupleLike { TupleLike, NotTupleLike, Error }; } | |||
1028 | ||||
1029 | static IsTupleLike isTupleLike(Sema &S, SourceLocation Loc, QualType T, | |||
1030 | llvm::APSInt &Size) { | |||
1031 | EnterExpressionEvaluationContext ContextRAII( | |||
1032 | S, Sema::ExpressionEvaluationContext::ConstantEvaluated); | |||
1033 | ||||
1034 | DeclarationName Value = S.PP.getIdentifierInfo("value"); | |||
1035 | LookupResult R(S, Value, Loc, Sema::LookupOrdinaryName); | |||
1036 | ||||
1037 | // Form template argument list for tuple_size<T>. | |||
1038 | TemplateArgumentListInfo Args(Loc, Loc); | |||
1039 | Args.addArgument(getTrivialTypeTemplateArgument(S, Loc, T)); | |||
1040 | ||||
1041 | // If there's no tuple_size specialization or the lookup of 'value' is empty, | |||
1042 | // it's not tuple-like. | |||
1043 | if (lookupStdTypeTraitMember(S, R, Loc, "tuple_size", Args, /*DiagID*/ 0) || | |||
1044 | R.empty()) | |||
1045 | return IsTupleLike::NotTupleLike; | |||
1046 | ||||
1047 | // If we get this far, we've committed to the tuple interpretation, but | |||
1048 | // we can still fail if there actually isn't a usable ::value. | |||
1049 | ||||
1050 | struct ICEDiagnoser : Sema::VerifyICEDiagnoser { | |||
1051 | LookupResult &R; | |||
1052 | TemplateArgumentListInfo &Args; | |||
1053 | ICEDiagnoser(LookupResult &R, TemplateArgumentListInfo &Args) | |||
1054 | : R(R), Args(Args) {} | |||
1055 | void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) { | |||
1056 | S.Diag(Loc, diag::err_decomp_decl_std_tuple_size_not_constant) | |||
1057 | << printTemplateArgs(S.Context.getPrintingPolicy(), Args); | |||
1058 | } | |||
1059 | } Diagnoser(R, Args); | |||
1060 | ||||
1061 | ExprResult E = | |||
1062 | S.BuildDeclarationNameExpr(CXXScopeSpec(), R, /*NeedsADL*/false); | |||
1063 | if (E.isInvalid()) | |||
1064 | return IsTupleLike::Error; | |||
1065 | ||||
1066 | E = S.VerifyIntegerConstantExpression(E.get(), &Size, Diagnoser, false); | |||
1067 | if (E.isInvalid()) | |||
1068 | return IsTupleLike::Error; | |||
1069 | ||||
1070 | return IsTupleLike::TupleLike; | |||
1071 | } | |||
1072 | ||||
1073 | /// \return std::tuple_element<I, T>::type. | |||
1074 | static QualType getTupleLikeElementType(Sema &S, SourceLocation Loc, | |||
1075 | unsigned I, QualType T) { | |||
1076 | // Form template argument list for tuple_element<I, T>. | |||
1077 | TemplateArgumentListInfo Args(Loc, Loc); | |||
1078 | Args.addArgument( | |||
1079 | getTrivialIntegralTemplateArgument(S, Loc, S.Context.getSizeType(), I)); | |||
1080 | Args.addArgument(getTrivialTypeTemplateArgument(S, Loc, T)); | |||
1081 | ||||
1082 | DeclarationName TypeDN = S.PP.getIdentifierInfo("type"); | |||
1083 | LookupResult R(S, TypeDN, Loc, Sema::LookupOrdinaryName); | |||
1084 | if (lookupStdTypeTraitMember( | |||
1085 | S, R, Loc, "tuple_element", Args, | |||
1086 | diag::err_decomp_decl_std_tuple_element_not_specialized)) | |||
1087 | return QualType(); | |||
1088 | ||||
1089 | auto *TD = R.getAsSingle<TypeDecl>(); | |||
1090 | if (!TD) { | |||
1091 | R.suppressDiagnostics(); | |||
1092 | S.Diag(Loc, diag::err_decomp_decl_std_tuple_element_not_specialized) | |||
1093 | << printTemplateArgs(S.Context.getPrintingPolicy(), Args); | |||
1094 | if (!R.empty()) | |||
1095 | S.Diag(R.getRepresentativeDecl()->getLocation(), diag::note_declared_at); | |||
1096 | return QualType(); | |||
1097 | } | |||
1098 | ||||
1099 | return S.Context.getTypeDeclType(TD); | |||
1100 | } | |||
1101 | ||||
1102 | namespace { | |||
1103 | struct BindingDiagnosticTrap { | |||
1104 | Sema &S; | |||
1105 | DiagnosticErrorTrap Trap; | |||
1106 | BindingDecl *BD; | |||
1107 | ||||
1108 | BindingDiagnosticTrap(Sema &S, BindingDecl *BD) | |||
1109 | : S(S), Trap(S.Diags), BD(BD) {} | |||
1110 | ~BindingDiagnosticTrap() { | |||
1111 | if (Trap.hasErrorOccurred()) | |||
1112 | S.Diag(BD->getLocation(), diag::note_in_binding_decl_init) << BD; | |||
1113 | } | |||
1114 | }; | |||
1115 | } | |||
1116 | ||||
1117 | static bool checkTupleLikeDecomposition(Sema &S, | |||
1118 | ArrayRef<BindingDecl *> Bindings, | |||
1119 | VarDecl *Src, QualType DecompType, | |||
1120 | const llvm::APSInt &TupleSize) { | |||
1121 | if ((int64_t)Bindings.size() != TupleSize) { | |||
1122 | S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings) | |||
1123 | << DecompType << (unsigned)Bindings.size() << TupleSize.toString(10) | |||
1124 | << (TupleSize < Bindings.size()); | |||
1125 | return true; | |||
1126 | } | |||
1127 | ||||
1128 | if (Bindings.empty()) | |||
1129 | return false; | |||
1130 | ||||
1131 | DeclarationName GetDN = S.PP.getIdentifierInfo("get"); | |||
1132 | ||||
1133 | // [dcl.decomp]p3: | |||
1134 | // The unqualified-id get is looked up in the scope of E by class member | |||
1135 | // access lookup ... | |||
1136 | LookupResult MemberGet(S, GetDN, Src->getLocation(), Sema::LookupMemberName); | |||
1137 | bool UseMemberGet = false; | |||
1138 | if (S.isCompleteType(Src->getLocation(), DecompType)) { | |||
1139 | if (auto *RD = DecompType->getAsCXXRecordDecl()) | |||
1140 | S.LookupQualifiedName(MemberGet, RD); | |||
1141 | if (MemberGet.isAmbiguous()) | |||
1142 | return true; | |||
1143 | // ... and if that finds at least one declaration that is a function | |||
1144 | // template whose first template parameter is a non-type parameter ... | |||
1145 | for (NamedDecl *D : MemberGet) { | |||
1146 | if (FunctionTemplateDecl *FTD = | |||
1147 | dyn_cast<FunctionTemplateDecl>(D->getUnderlyingDecl())) { | |||
1148 | TemplateParameterList *TPL = FTD->getTemplateParameters(); | |||
1149 | if (TPL->size() != 0 && | |||
1150 | isa<NonTypeTemplateParmDecl>(TPL->getParam(0))) { | |||
1151 | // ... the initializer is e.get<i>(). | |||
1152 | UseMemberGet = true; | |||
1153 | break; | |||
1154 | } | |||
1155 | } | |||
1156 | } | |||
1157 | } | |||
1158 | ||||
1159 | unsigned I = 0; | |||
1160 | for (auto *B : Bindings) { | |||
1161 | BindingDiagnosticTrap Trap(S, B); | |||
1162 | SourceLocation Loc = B->getLocation(); | |||
1163 | ||||
1164 | ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc); | |||
1165 | if (E.isInvalid()) | |||
1166 | return true; | |||
1167 | ||||
1168 | // e is an lvalue if the type of the entity is an lvalue reference and | |||
1169 | // an xvalue otherwise | |||
1170 | if (!Src->getType()->isLValueReferenceType()) | |||
1171 | E = ImplicitCastExpr::Create(S.Context, E.get()->getType(), CK_NoOp, | |||
1172 | E.get(), nullptr, VK_XValue); | |||
1173 | ||||
1174 | TemplateArgumentListInfo Args(Loc, Loc); | |||
1175 | Args.addArgument( | |||
1176 | getTrivialIntegralTemplateArgument(S, Loc, S.Context.getSizeType(), I)); | |||
1177 | ||||
1178 | if (UseMemberGet) { | |||
1179 | // if [lookup of member get] finds at least one declaration, the | |||
1180 | // initializer is e.get<i-1>(). | |||
1181 | E = S.BuildMemberReferenceExpr(E.get(), DecompType, Loc, false, | |||
1182 | CXXScopeSpec(), SourceLocation(), nullptr, | |||
1183 | MemberGet, &Args, nullptr); | |||
1184 | if (E.isInvalid()) | |||
1185 | return true; | |||
1186 | ||||
1187 | E = S.BuildCallExpr(nullptr, E.get(), Loc, None, Loc); | |||
1188 | } else { | |||
1189 | // Otherwise, the initializer is get<i-1>(e), where get is looked up | |||
1190 | // in the associated namespaces. | |||
1191 | Expr *Get = UnresolvedLookupExpr::Create( | |||
1192 | S.Context, nullptr, NestedNameSpecifierLoc(), SourceLocation(), | |||
1193 | DeclarationNameInfo(GetDN, Loc), /*RequiresADL*/true, &Args, | |||
1194 | UnresolvedSetIterator(), UnresolvedSetIterator()); | |||
1195 | ||||
1196 | Expr *Arg = E.get(); | |||
1197 | E = S.BuildCallExpr(nullptr, Get, Loc, Arg, Loc); | |||
1198 | } | |||
1199 | if (E.isInvalid()) | |||
1200 | return true; | |||
1201 | Expr *Init = E.get(); | |||
1202 | ||||
1203 | // Given the type T designated by std::tuple_element<i - 1, E>::type, | |||
1204 | QualType T = getTupleLikeElementType(S, Loc, I, DecompType); | |||
1205 | if (T.isNull()) | |||
1206 | return true; | |||
1207 | ||||
1208 | // each vi is a variable of type "reference to T" initialized with the | |||
1209 | // initializer, where the reference is an lvalue reference if the | |||
1210 | // initializer is an lvalue and an rvalue reference otherwise | |||
1211 | QualType RefType = | |||
1212 | S.BuildReferenceType(T, E.get()->isLValue(), Loc, B->getDeclName()); | |||
1213 | if (RefType.isNull()) | |||
1214 | return true; | |||
1215 | auto *RefVD = VarDecl::Create( | |||
1216 | S.Context, Src->getDeclContext(), Loc, Loc, | |||
1217 | B->getDeclName().getAsIdentifierInfo(), RefType, | |||
1218 | S.Context.getTrivialTypeSourceInfo(T, Loc), Src->getStorageClass()); | |||
1219 | RefVD->setLexicalDeclContext(Src->getLexicalDeclContext()); | |||
1220 | RefVD->setTSCSpec(Src->getTSCSpec()); | |||
1221 | RefVD->setImplicit(); | |||
1222 | if (Src->isInlineSpecified()) | |||
1223 | RefVD->setInlineSpecified(); | |||
1224 | RefVD->getLexicalDeclContext()->addHiddenDecl(RefVD); | |||
1225 | ||||
1226 | InitializedEntity Entity = InitializedEntity::InitializeBinding(RefVD); | |||
1227 | InitializationKind Kind = InitializationKind::CreateCopy(Loc, Loc); | |||
1228 | InitializationSequence Seq(S, Entity, Kind, Init); | |||
1229 | E = Seq.Perform(S, Entity, Kind, Init); | |||
1230 | if (E.isInvalid()) | |||
1231 | return true; | |||
1232 | E = S.ActOnFinishFullExpr(E.get(), Loc, /*DiscardedValue*/ false); | |||
1233 | if (E.isInvalid()) | |||
1234 | return true; | |||
1235 | RefVD->setInit(E.get()); | |||
1236 | if (!E.get()->isValueDependent()) | |||
1237 | RefVD->checkInitIsICE(); | |||
1238 | ||||
1239 | E = S.BuildDeclarationNameExpr(CXXScopeSpec(), | |||
1240 | DeclarationNameInfo(B->getDeclName(), Loc), | |||
1241 | RefVD); | |||
1242 | if (E.isInvalid()) | |||
1243 | return true; | |||
1244 | ||||
1245 | B->setBinding(T, E.get()); | |||
1246 | I++; | |||
1247 | } | |||
1248 | ||||
1249 | return false; | |||
1250 | } | |||
1251 | ||||
1252 | /// Find the base class to decompose in a built-in decomposition of a class type. | |||
1253 | /// This base class search is, unfortunately, not quite like any other that we | |||
1254 | /// perform anywhere else in C++. | |||
1255 | static DeclAccessPair findDecomposableBaseClass(Sema &S, SourceLocation Loc, | |||
1256 | const CXXRecordDecl *RD, | |||
1257 | CXXCastPath &BasePath) { | |||
1258 | auto BaseHasFields = [](const CXXBaseSpecifier *Specifier, | |||
1259 | CXXBasePath &Path) { | |||
1260 | return Specifier->getType()->getAsCXXRecordDecl()->hasDirectFields(); | |||
1261 | }; | |||
1262 | ||||
1263 | const CXXRecordDecl *ClassWithFields = nullptr; | |||
1264 | AccessSpecifier AS = AS_public; | |||
1265 | if (RD->hasDirectFields()) | |||
1266 | // [dcl.decomp]p4: | |||
1267 | // Otherwise, all of E's non-static data members shall be public direct | |||
1268 | // members of E ... | |||
1269 | ClassWithFields = RD; | |||
1270 | else { | |||
1271 | // ... or of ... | |||
1272 | CXXBasePaths Paths; | |||
1273 | Paths.setOrigin(const_cast<CXXRecordDecl*>(RD)); | |||
1274 | if (!RD->lookupInBases(BaseHasFields, Paths)) { | |||
1275 | // If no classes have fields, just decompose RD itself. (This will work | |||
1276 | // if and only if zero bindings were provided.) | |||
1277 | return DeclAccessPair::make(const_cast<CXXRecordDecl*>(RD), AS_public); | |||
1278 | } | |||
1279 | ||||
1280 | CXXBasePath *BestPath = nullptr; | |||
1281 | for (auto &P : Paths) { | |||
1282 | if (!BestPath) | |||
1283 | BestPath = &P; | |||
1284 | else if (!S.Context.hasSameType(P.back().Base->getType(), | |||
1285 | BestPath->back().Base->getType())) { | |||
1286 | // ... the same ... | |||
1287 | S.Diag(Loc, diag::err_decomp_decl_multiple_bases_with_members) | |||
1288 | << false << RD << BestPath->back().Base->getType() | |||
1289 | << P.back().Base->getType(); | |||
1290 | return DeclAccessPair(); | |||
1291 | } else if (P.Access < BestPath->Access) { | |||
1292 | BestPath = &P; | |||
1293 | } | |||
1294 | } | |||
1295 | ||||
1296 | // ... unambiguous ... | |||
1297 | QualType BaseType = BestPath->back().Base->getType(); | |||
1298 | if (Paths.isAmbiguous(S.Context.getCanonicalType(BaseType))) { | |||
1299 | S.Diag(Loc, diag::err_decomp_decl_ambiguous_base) | |||
1300 | << RD << BaseType << S.getAmbiguousPathsDisplayString(Paths); | |||
1301 | return DeclAccessPair(); | |||
1302 | } | |||
1303 | ||||
1304 | // ... [accessible, implied by other rules] base class of E. | |||
1305 | S.CheckBaseClassAccess(Loc, BaseType, S.Context.getRecordType(RD), | |||
1306 | *BestPath, diag::err_decomp_decl_inaccessible_base); | |||
1307 | AS = BestPath->Access; | |||
1308 | ||||
1309 | ClassWithFields = BaseType->getAsCXXRecordDecl(); | |||
1310 | S.BuildBasePathArray(Paths, BasePath); | |||
1311 | } | |||
1312 | ||||
1313 | // The above search did not check whether the selected class itself has base | |||
1314 | // classes with fields, so check that now. | |||
1315 | CXXBasePaths Paths; | |||
1316 | if (ClassWithFields->lookupInBases(BaseHasFields, Paths)) { | |||
1317 | S.Diag(Loc, diag::err_decomp_decl_multiple_bases_with_members) | |||
1318 | << (ClassWithFields == RD) << RD << ClassWithFields | |||
1319 | << Paths.front().back().Base->getType(); | |||
1320 | return DeclAccessPair(); | |||
1321 | } | |||
1322 | ||||
1323 | return DeclAccessPair::make(const_cast<CXXRecordDecl*>(ClassWithFields), AS); | |||
1324 | } | |||
1325 | ||||
1326 | static bool checkMemberDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings, | |||
1327 | ValueDecl *Src, QualType DecompType, | |||
1328 | const CXXRecordDecl *OrigRD) { | |||
1329 | if (S.RequireCompleteType(Src->getLocation(), DecompType, | |||
1330 | diag::err_incomplete_type)) | |||
1331 | return true; | |||
1332 | ||||
1333 | CXXCastPath BasePath; | |||
1334 | DeclAccessPair BasePair = | |||
1335 | findDecomposableBaseClass(S, Src->getLocation(), OrigRD, BasePath); | |||
1336 | const CXXRecordDecl *RD = cast_or_null<CXXRecordDecl>(BasePair.getDecl()); | |||
1337 | if (!RD) | |||
1338 | return true; | |||
1339 | QualType BaseType = S.Context.getQualifiedType(S.Context.getRecordType(RD), | |||
1340 | DecompType.getQualifiers()); | |||
1341 | ||||
1342 | auto DiagnoseBadNumberOfBindings = [&]() -> bool { | |||
1343 | unsigned NumFields = | |||
1344 | std::count_if(RD->field_begin(), RD->field_end(), | |||
1345 | [](FieldDecl *FD) { return !FD->isUnnamedBitfield(); }); | |||
1346 | assert(Bindings.size() != NumFields)((Bindings.size() != NumFields) ? static_cast<void> (0) : __assert_fail ("Bindings.size() != NumFields", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 1346, __PRETTY_FUNCTION__)); | |||
1347 | S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings) | |||
1348 | << DecompType << (unsigned)Bindings.size() << NumFields | |||
1349 | << (NumFields < Bindings.size()); | |||
1350 | return true; | |||
1351 | }; | |||
1352 | ||||
1353 | // all of E's non-static data members shall be [...] well-formed | |||
1354 | // when named as e.name in the context of the structured binding, | |||
1355 | // E shall not have an anonymous union member, ... | |||
1356 | unsigned I = 0; | |||
1357 | for (auto *FD : RD->fields()) { | |||
1358 | if (FD->isUnnamedBitfield()) | |||
1359 | continue; | |||
1360 | ||||
1361 | if (FD->isAnonymousStructOrUnion()) { | |||
1362 | S.Diag(Src->getLocation(), diag::err_decomp_decl_anon_union_member) | |||
1363 | << DecompType << FD->getType()->isUnionType(); | |||
1364 | S.Diag(FD->getLocation(), diag::note_declared_at); | |||
1365 | return true; | |||
1366 | } | |||
1367 | ||||
1368 | // We have a real field to bind. | |||
1369 | if (I >= Bindings.size()) | |||
1370 | return DiagnoseBadNumberOfBindings(); | |||
1371 | auto *B = Bindings[I++]; | |||
1372 | SourceLocation Loc = B->getLocation(); | |||
1373 | ||||
1374 | // The field must be accessible in the context of the structured binding. | |||
1375 | // We already checked that the base class is accessible. | |||
1376 | // FIXME: Add 'const' to AccessedEntity's classes so we can remove the | |||
1377 | // const_cast here. | |||
1378 | S.CheckStructuredBindingMemberAccess( | |||
1379 | Loc, const_cast<CXXRecordDecl *>(OrigRD), | |||
1380 | DeclAccessPair::make(FD, CXXRecordDecl::MergeAccess( | |||
1381 | BasePair.getAccess(), FD->getAccess()))); | |||
1382 | ||||
1383 | // Initialize the binding to Src.FD. | |||
1384 | ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc); | |||
1385 | if (E.isInvalid()) | |||
1386 | return true; | |||
1387 | E = S.ImpCastExprToType(E.get(), BaseType, CK_UncheckedDerivedToBase, | |||
1388 | VK_LValue, &BasePath); | |||
1389 | if (E.isInvalid()) | |||
1390 | return true; | |||
1391 | E = S.BuildFieldReferenceExpr(E.get(), /*IsArrow*/ false, Loc, | |||
1392 | CXXScopeSpec(), FD, | |||
1393 | DeclAccessPair::make(FD, FD->getAccess()), | |||
1394 | DeclarationNameInfo(FD->getDeclName(), Loc)); | |||
1395 | if (E.isInvalid()) | |||
1396 | return true; | |||
1397 | ||||
1398 | // If the type of the member is T, the referenced type is cv T, where cv is | |||
1399 | // the cv-qualification of the decomposition expression. | |||
1400 | // | |||
1401 | // FIXME: We resolve a defect here: if the field is mutable, we do not add | |||
1402 | // 'const' to the type of the field. | |||
1403 | Qualifiers Q = DecompType.getQualifiers(); | |||
1404 | if (FD->isMutable()) | |||
1405 | Q.removeConst(); | |||
1406 | B->setBinding(S.BuildQualifiedType(FD->getType(), Loc, Q), E.get()); | |||
1407 | } | |||
1408 | ||||
1409 | if (I != Bindings.size()) | |||
1410 | return DiagnoseBadNumberOfBindings(); | |||
1411 | ||||
1412 | return false; | |||
1413 | } | |||
1414 | ||||
1415 | void Sema::CheckCompleteDecompositionDeclaration(DecompositionDecl *DD) { | |||
1416 | QualType DecompType = DD->getType(); | |||
1417 | ||||
1418 | // If the type of the decomposition is dependent, then so is the type of | |||
1419 | // each binding. | |||
1420 | if (DecompType->isDependentType()) { | |||
1421 | for (auto *B : DD->bindings()) | |||
1422 | B->setType(Context.DependentTy); | |||
1423 | return; | |||
1424 | } | |||
1425 | ||||
1426 | DecompType = DecompType.getNonReferenceType(); | |||
1427 | ArrayRef<BindingDecl*> Bindings = DD->bindings(); | |||
1428 | ||||
1429 | // C++1z [dcl.decomp]/2: | |||
1430 | // If E is an array type [...] | |||
1431 | // As an extension, we also support decomposition of built-in complex and | |||
1432 | // vector types. | |||
1433 | if (auto *CAT = Context.getAsConstantArrayType(DecompType)) { | |||
1434 | if (checkArrayDecomposition(*this, Bindings, DD, DecompType, CAT)) | |||
1435 | DD->setInvalidDecl(); | |||
1436 | return; | |||
1437 | } | |||
1438 | if (auto *VT = DecompType->getAs<VectorType>()) { | |||
1439 | if (checkVectorDecomposition(*this, Bindings, DD, DecompType, VT)) | |||
1440 | DD->setInvalidDecl(); | |||
1441 | return; | |||
1442 | } | |||
1443 | if (auto *CT = DecompType->getAs<ComplexType>()) { | |||
1444 | if (checkComplexDecomposition(*this, Bindings, DD, DecompType, CT)) | |||
1445 | DD->setInvalidDecl(); | |||
1446 | return; | |||
1447 | } | |||
1448 | ||||
1449 | // C++1z [dcl.decomp]/3: | |||
1450 | // if the expression std::tuple_size<E>::value is a well-formed integral | |||
1451 | // constant expression, [...] | |||
1452 | llvm::APSInt TupleSize(32); | |||
1453 | switch (isTupleLike(*this, DD->getLocation(), DecompType, TupleSize)) { | |||
1454 | case IsTupleLike::Error: | |||
1455 | DD->setInvalidDecl(); | |||
1456 | return; | |||
1457 | ||||
1458 | case IsTupleLike::TupleLike: | |||
1459 | if (checkTupleLikeDecomposition(*this, Bindings, DD, DecompType, TupleSize)) | |||
1460 | DD->setInvalidDecl(); | |||
1461 | return; | |||
1462 | ||||
1463 | case IsTupleLike::NotTupleLike: | |||
1464 | break; | |||
1465 | } | |||
1466 | ||||
1467 | // C++1z [dcl.dcl]/8: | |||
1468 | // [E shall be of array or non-union class type] | |||
1469 | CXXRecordDecl *RD = DecompType->getAsCXXRecordDecl(); | |||
1470 | if (!RD || RD->isUnion()) { | |||
1471 | Diag(DD->getLocation(), diag::err_decomp_decl_unbindable_type) | |||
1472 | << DD << !RD << DecompType; | |||
1473 | DD->setInvalidDecl(); | |||
1474 | return; | |||
1475 | } | |||
1476 | ||||
1477 | // C++1z [dcl.decomp]/4: | |||
1478 | // all of E's non-static data members shall be [...] direct members of | |||
1479 | // E or of the same unambiguous public base class of E, ... | |||
1480 | if (checkMemberDecomposition(*this, Bindings, DD, DecompType, RD)) | |||
1481 | DD->setInvalidDecl(); | |||
1482 | } | |||
1483 | ||||
1484 | /// Merge the exception specifications of two variable declarations. | |||
1485 | /// | |||
1486 | /// This is called when there's a redeclaration of a VarDecl. The function | |||
1487 | /// checks if the redeclaration might have an exception specification and | |||
1488 | /// validates compatibility and merges the specs if necessary. | |||
1489 | void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { | |||
1490 | // Shortcut if exceptions are disabled. | |||
1491 | if (!getLangOpts().CXXExceptions) | |||
1492 | return; | |||
1493 | ||||
1494 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 1495, __PRETTY_FUNCTION__)) | |||
1495 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 1495, __PRETTY_FUNCTION__)); | |||
1496 | ||||
1497 | QualType NewType = New->getType(); | |||
1498 | QualType OldType = Old->getType(); | |||
1499 | ||||
1500 | // We're only interested in pointers and references to functions, as well | |||
1501 | // as pointers to member functions. | |||
1502 | if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { | |||
1503 | NewType = R->getPointeeType(); | |||
1504 | OldType = OldType->castAs<ReferenceType>()->getPointeeType(); | |||
1505 | } else if (const PointerType *P = NewType->getAs<PointerType>()) { | |||
1506 | NewType = P->getPointeeType(); | |||
1507 | OldType = OldType->castAs<PointerType>()->getPointeeType(); | |||
1508 | } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { | |||
1509 | NewType = M->getPointeeType(); | |||
1510 | OldType = OldType->castAs<MemberPointerType>()->getPointeeType(); | |||
1511 | } | |||
1512 | ||||
1513 | if (!NewType->isFunctionProtoType()) | |||
1514 | return; | |||
1515 | ||||
1516 | // There's lots of special cases for functions. For function pointers, system | |||
1517 | // libraries are hopefully not as broken so that we don't need these | |||
1518 | // workarounds. | |||
1519 | if (CheckEquivalentExceptionSpec( | |||
1520 | OldType->getAs<FunctionProtoType>(), Old->getLocation(), | |||
1521 | NewType->getAs<FunctionProtoType>(), New->getLocation())) { | |||
1522 | New->setInvalidDecl(); | |||
1523 | } | |||
1524 | } | |||
1525 | ||||
1526 | /// CheckCXXDefaultArguments - Verify that the default arguments for a | |||
1527 | /// function declaration are well-formed according to C++ | |||
1528 | /// [dcl.fct.default]. | |||
1529 | void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { | |||
1530 | unsigned NumParams = FD->getNumParams(); | |||
1531 | unsigned p; | |||
1532 | ||||
1533 | // Find first parameter with a default argument | |||
1534 | for (p = 0; p < NumParams; ++p) { | |||
1535 | ParmVarDecl *Param = FD->getParamDecl(p); | |||
1536 | if (Param->hasDefaultArg()) | |||
1537 | break; | |||
1538 | } | |||
1539 | ||||
1540 | // C++11 [dcl.fct.default]p4: | |||
1541 | // In a given function declaration, each parameter subsequent to a parameter | |||
1542 | // with a default argument shall have a default argument supplied in this or | |||
1543 | // a previous declaration or shall be a function parameter pack. A default | |||
1544 | // argument shall not be redefined by a later declaration (not even to the | |||
1545 | // same value). | |||
1546 | unsigned LastMissingDefaultArg = 0; | |||
1547 | for (; p < NumParams; ++p) { | |||
1548 | ParmVarDecl *Param = FD->getParamDecl(p); | |||
1549 | if (!Param->hasDefaultArg() && !Param->isParameterPack()) { | |||
1550 | if (Param->isInvalidDecl()) | |||
1551 | /* We already complained about this parameter. */; | |||
1552 | else if (Param->getIdentifier()) | |||
1553 | Diag(Param->getLocation(), | |||
1554 | diag::err_param_default_argument_missing_name) | |||
1555 | << Param->getIdentifier(); | |||
1556 | else | |||
1557 | Diag(Param->getLocation(), | |||
1558 | diag::err_param_default_argument_missing); | |||
1559 | ||||
1560 | LastMissingDefaultArg = p; | |||
1561 | } | |||
1562 | } | |||
1563 | ||||
1564 | if (LastMissingDefaultArg > 0) { | |||
1565 | // Some default arguments were missing. Clear out all of the | |||
1566 | // default arguments up to (and including) the last missing | |||
1567 | // default argument, so that we leave the function parameters | |||
1568 | // in a semantically valid state. | |||
1569 | for (p = 0; p <= LastMissingDefaultArg; ++p) { | |||
1570 | ParmVarDecl *Param = FD->getParamDecl(p); | |||
1571 | if (Param->hasDefaultArg()) { | |||
1572 | Param->setDefaultArg(nullptr); | |||
1573 | } | |||
1574 | } | |||
1575 | } | |||
1576 | } | |||
1577 | ||||
1578 | /// Check that the given type is a literal type. Issue a diagnostic if not, | |||
1579 | /// if Kind is Diagnose. | |||
1580 | /// \return \c true if a problem has been found (and optionally diagnosed). | |||
1581 | template <typename... Ts> | |||
1582 | static bool CheckLiteralType(Sema &SemaRef, Sema::CheckConstexprKind Kind, | |||
1583 | SourceLocation Loc, QualType T, unsigned DiagID, | |||
1584 | Ts &&...DiagArgs) { | |||
1585 | if (T->isDependentType()) | |||
1586 | return false; | |||
1587 | ||||
1588 | switch (Kind) { | |||
1589 | case Sema::CheckConstexprKind::Diagnose: | |||
1590 | return SemaRef.RequireLiteralType(Loc, T, DiagID, | |||
1591 | std::forward<Ts>(DiagArgs)...); | |||
1592 | ||||
1593 | case Sema::CheckConstexprKind::CheckValid: | |||
1594 | return !T->isLiteralType(SemaRef.Context); | |||
1595 | } | |||
1596 | ||||
1597 | llvm_unreachable("unknown CheckConstexprKind")::llvm::llvm_unreachable_internal("unknown CheckConstexprKind" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 1597); | |||
1598 | } | |||
1599 | ||||
1600 | /// Determine whether a destructor cannot be constexpr due to | |||
1601 | static bool CheckConstexprDestructorSubobjects(Sema &SemaRef, | |||
1602 | const CXXDestructorDecl *DD, | |||
1603 | Sema::CheckConstexprKind Kind) { | |||
1604 | auto Check = [&](SourceLocation Loc, QualType T, const FieldDecl *FD) { | |||
1605 | const CXXRecordDecl *RD = | |||
1606 | T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl(); | |||
1607 | if (!RD || RD->hasConstexprDestructor()) | |||
1608 | return true; | |||
1609 | ||||
1610 | if (Kind == Sema::CheckConstexprKind::Diagnose) { | |||
1611 | SemaRef.Diag(DD->getLocation(), diag::err_constexpr_dtor_subobject) | |||
1612 | << DD->getConstexprKind() << !FD | |||
1613 | << (FD ? FD->getDeclName() : DeclarationName()) << T; | |||
1614 | SemaRef.Diag(Loc, diag::note_constexpr_dtor_subobject) | |||
1615 | << !FD << (FD ? FD->getDeclName() : DeclarationName()) << T; | |||
1616 | } | |||
1617 | return false; | |||
1618 | }; | |||
1619 | ||||
1620 | const CXXRecordDecl *RD = DD->getParent(); | |||
1621 | for (const CXXBaseSpecifier &B : RD->bases()) | |||
1622 | if (!Check(B.getBaseTypeLoc(), B.getType(), nullptr)) | |||
1623 | return false; | |||
1624 | for (const FieldDecl *FD : RD->fields()) | |||
1625 | if (!Check(FD->getLocation(), FD->getType(), FD)) | |||
1626 | return false; | |||
1627 | return true; | |||
1628 | } | |||
1629 | ||||
1630 | /// Check whether a function's parameter types are all literal types. If so, | |||
1631 | /// return true. If not, produce a suitable diagnostic and return false. | |||
1632 | static bool CheckConstexprParameterTypes(Sema &SemaRef, | |||
1633 | const FunctionDecl *FD, | |||
1634 | Sema::CheckConstexprKind Kind) { | |||
1635 | unsigned ArgIndex = 0; | |||
1636 | const auto *FT = FD->getType()->castAs<FunctionProtoType>(); | |||
1637 | for (FunctionProtoType::param_type_iterator i = FT->param_type_begin(), | |||
1638 | e = FT->param_type_end(); | |||
1639 | i != e; ++i, ++ArgIndex) { | |||
1640 | const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); | |||
1641 | SourceLocation ParamLoc = PD->getLocation(); | |||
1642 | if (CheckLiteralType(SemaRef, Kind, ParamLoc, *i, | |||
1643 | diag::err_constexpr_non_literal_param, ArgIndex + 1, | |||
1644 | PD->getSourceRange(), isa<CXXConstructorDecl>(FD), | |||
1645 | FD->isConsteval())) | |||
1646 | return false; | |||
1647 | } | |||
1648 | return true; | |||
1649 | } | |||
1650 | ||||
1651 | /// Check whether a function's return type is a literal type. If so, return | |||
1652 | /// true. If not, produce a suitable diagnostic and return false. | |||
1653 | static bool CheckConstexprReturnType(Sema &SemaRef, const FunctionDecl *FD, | |||
1654 | Sema::CheckConstexprKind Kind) { | |||
1655 | if (CheckLiteralType(SemaRef, Kind, FD->getLocation(), FD->getReturnType(), | |||
1656 | diag::err_constexpr_non_literal_return, | |||
1657 | FD->isConsteval())) | |||
1658 | return false; | |||
1659 | return true; | |||
1660 | } | |||
1661 | ||||
1662 | /// Get diagnostic %select index for tag kind for | |||
1663 | /// record diagnostic message. | |||
1664 | /// WARNING: Indexes apply to particular diagnostics only! | |||
1665 | /// | |||
1666 | /// \returns diagnostic %select index. | |||
1667 | static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { | |||
1668 | switch (Tag) { | |||
1669 | case TTK_Struct: return 0; | |||
1670 | case TTK_Interface: return 1; | |||
1671 | case TTK_Class: return 2; | |||
1672 | default: llvm_unreachable("Invalid tag kind for record diagnostic!")::llvm::llvm_unreachable_internal("Invalid tag kind for record diagnostic!" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 1672); | |||
1673 | } | |||
1674 | } | |||
1675 | ||||
1676 | static bool CheckConstexprFunctionBody(Sema &SemaRef, const FunctionDecl *Dcl, | |||
1677 | Stmt *Body, | |||
1678 | Sema::CheckConstexprKind Kind); | |||
1679 | ||||
1680 | // Check whether a function declaration satisfies the requirements of a | |||
1681 | // constexpr function definition or a constexpr constructor definition. If so, | |||
1682 | // return true. If not, produce appropriate diagnostics (unless asked not to by | |||
1683 | // Kind) and return false. | |||
1684 | // | |||
1685 | // This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. | |||
1686 | bool Sema::CheckConstexprFunctionDefinition(const FunctionDecl *NewFD, | |||
1687 | CheckConstexprKind Kind) { | |||
1688 | const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); | |||
1689 | if (MD && MD->isInstance()) { | |||
1690 | // C++11 [dcl.constexpr]p4: | |||
1691 | // The definition of a constexpr constructor shall satisfy the following | |||
1692 | // constraints: | |||
1693 | // - the class shall not have any virtual base classes; | |||
1694 | // | |||
1695 | // FIXME: This only applies to constructors and destructors, not arbitrary | |||
1696 | // member functions. | |||
1697 | const CXXRecordDecl *RD = MD->getParent(); | |||
1698 | if (RD->getNumVBases()) { | |||
1699 | if (Kind == CheckConstexprKind::CheckValid) | |||
1700 | return false; | |||
1701 | ||||
1702 | Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) | |||
1703 | << isa<CXXConstructorDecl>(NewFD) | |||
1704 | << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); | |||
1705 | for (const auto &I : RD->vbases()) | |||
1706 | Diag(I.getBeginLoc(), diag::note_constexpr_virtual_base_here) | |||
1707 | << I.getSourceRange(); | |||
1708 | return false; | |||
1709 | } | |||
1710 | } | |||
1711 | ||||
1712 | if (!isa<CXXConstructorDecl>(NewFD)) { | |||
1713 | // C++11 [dcl.constexpr]p3: | |||
1714 | // The definition of a constexpr function shall satisfy the following | |||
1715 | // constraints: | |||
1716 | // - it shall not be virtual; (removed in C++20) | |||
1717 | const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); | |||
1718 | if (Method && Method->isVirtual()) { | |||
1719 | if (getLangOpts().CPlusPlus2a) { | |||
1720 | if (Kind == CheckConstexprKind::Diagnose) | |||
1721 | Diag(Method->getLocation(), diag::warn_cxx17_compat_constexpr_virtual); | |||
1722 | } else { | |||
1723 | if (Kind == CheckConstexprKind::CheckValid) | |||
1724 | return false; | |||
1725 | ||||
1726 | Method = Method->getCanonicalDecl(); | |||
1727 | Diag(Method->getLocation(), diag::err_constexpr_virtual); | |||
1728 | ||||
1729 | // If it's not obvious why this function is virtual, find an overridden | |||
1730 | // function which uses the 'virtual' keyword. | |||
1731 | const CXXMethodDecl *WrittenVirtual = Method; | |||
1732 | while (!WrittenVirtual->isVirtualAsWritten()) | |||
1733 | WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); | |||
1734 | if (WrittenVirtual != Method) | |||
1735 | Diag(WrittenVirtual->getLocation(), | |||
1736 | diag::note_overridden_virtual_function); | |||
1737 | return false; | |||
1738 | } | |||
1739 | } | |||
1740 | ||||
1741 | // - its return type shall be a literal type; | |||
1742 | if (!CheckConstexprReturnType(*this, NewFD, Kind)) | |||
1743 | return false; | |||
1744 | } | |||
1745 | ||||
1746 | if (auto *Dtor = dyn_cast<CXXDestructorDecl>(NewFD)) { | |||
1747 | // A destructor can be constexpr only if the defaulted destructor could be; | |||
1748 | // we don't need to check the members and bases if we already know they all | |||
1749 | // have constexpr destructors. | |||
1750 | if (!Dtor->getParent()->defaultedDestructorIsConstexpr()) { | |||
1751 | if (Kind == CheckConstexprKind::CheckValid) | |||
1752 | return false; | |||
1753 | if (!CheckConstexprDestructorSubobjects(*this, Dtor, Kind)) | |||
1754 | return false; | |||
1755 | } | |||
1756 | } | |||
1757 | ||||
1758 | // - each of its parameter types shall be a literal type; | |||
1759 | if (!CheckConstexprParameterTypes(*this, NewFD, Kind)) | |||
1760 | return false; | |||
1761 | ||||
1762 | Stmt *Body = NewFD->getBody(); | |||
1763 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 1764, __PRETTY_FUNCTION__)) | |||
1764 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 1764, __PRETTY_FUNCTION__)); | |||
1765 | return CheckConstexprFunctionBody(*this, NewFD, Body, Kind); | |||
1766 | } | |||
1767 | ||||
1768 | /// Check the given declaration statement is legal within a constexpr function | |||
1769 | /// body. C++11 [dcl.constexpr]p3,p4, and C++1y [dcl.constexpr]p3. | |||
1770 | /// | |||
1771 | /// \return true if the body is OK (maybe only as an extension), false if we | |||
1772 | /// have diagnosed a problem. | |||
1773 | static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, | |||
1774 | DeclStmt *DS, SourceLocation &Cxx1yLoc, | |||
1775 | Sema::CheckConstexprKind Kind) { | |||
1776 | // C++11 [dcl.constexpr]p3 and p4: | |||
1777 | // The definition of a constexpr function(p3) or constructor(p4) [...] shall | |||
1778 | // contain only | |||
1779 | for (const auto *DclIt : DS->decls()) { | |||
1780 | switch (DclIt->getKind()) { | |||
1781 | case Decl::StaticAssert: | |||
1782 | case Decl::Using: | |||
1783 | case Decl::UsingShadow: | |||
1784 | case Decl::UsingDirective: | |||
1785 | case Decl::UnresolvedUsingTypename: | |||
1786 | case Decl::UnresolvedUsingValue: | |||
1787 | // - static_assert-declarations | |||
1788 | // - using-declarations, | |||
1789 | // - using-directives, | |||
1790 | continue; | |||
1791 | ||||
1792 | case Decl::Typedef: | |||
1793 | case Decl::TypeAlias: { | |||
1794 | // - typedef declarations and alias-declarations that do not define | |||
1795 | // classes or enumerations, | |||
1796 | const auto *TN = cast<TypedefNameDecl>(DclIt); | |||
1797 | if (TN->getUnderlyingType()->isVariablyModifiedType()) { | |||
1798 | // Don't allow variably-modified types in constexpr functions. | |||
1799 | if (Kind == Sema::CheckConstexprKind::Diagnose) { | |||
1800 | TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); | |||
1801 | SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) | |||
1802 | << TL.getSourceRange() << TL.getType() | |||
1803 | << isa<CXXConstructorDecl>(Dcl); | |||
1804 | } | |||
1805 | return false; | |||
1806 | } | |||
1807 | continue; | |||
1808 | } | |||
1809 | ||||
1810 | case Decl::Enum: | |||
1811 | case Decl::CXXRecord: | |||
1812 | // C++1y allows types to be defined, not just declared. | |||
1813 | if (cast<TagDecl>(DclIt)->isThisDeclarationADefinition()) { | |||
1814 | if (Kind == Sema::CheckConstexprKind::Diagnose) { | |||
1815 | SemaRef.Diag(DS->getBeginLoc(), | |||
1816 | SemaRef.getLangOpts().CPlusPlus14 | |||
1817 | ? diag::warn_cxx11_compat_constexpr_type_definition | |||
1818 | : diag::ext_constexpr_type_definition) | |||
1819 | << isa<CXXConstructorDecl>(Dcl); | |||
1820 | } else if (!SemaRef.getLangOpts().CPlusPlus14) { | |||
1821 | return false; | |||
1822 | } | |||
1823 | } | |||
1824 | continue; | |||
1825 | ||||
1826 | case Decl::EnumConstant: | |||
1827 | case Decl::IndirectField: | |||
1828 | case Decl::ParmVar: | |||
1829 | // These can only appear with other declarations which are banned in | |||
1830 | // C++11 and permitted in C++1y, so ignore them. | |||
1831 | continue; | |||
1832 | ||||
1833 | case Decl::Var: | |||
1834 | case Decl::Decomposition: { | |||
1835 | // C++1y [dcl.constexpr]p3 allows anything except: | |||
1836 | // a definition of a variable of non-literal type or of static or | |||
1837 | // thread storage duration or [before C++2a] for which no | |||
1838 | // initialization is performed. | |||
1839 | const auto *VD = cast<VarDecl>(DclIt); | |||
1840 | if (VD->isThisDeclarationADefinition()) { | |||
1841 | if (VD->isStaticLocal()) { | |||
1842 | if (Kind == Sema::CheckConstexprKind::Diagnose) { | |||
1843 | SemaRef.Diag(VD->getLocation(), | |||
1844 | diag::err_constexpr_local_var_static) | |||
1845 | << isa<CXXConstructorDecl>(Dcl) | |||
1846 | << (VD->getTLSKind() == VarDecl::TLS_Dynamic); | |||
1847 | } | |||
1848 | return false; | |||
1849 | } | |||
1850 | if (CheckLiteralType(SemaRef, Kind, VD->getLocation(), VD->getType(), | |||
1851 | diag::err_constexpr_local_var_non_literal_type, | |||
1852 | isa<CXXConstructorDecl>(Dcl))) | |||
1853 | return false; | |||
1854 | if (!VD->getType()->isDependentType() && | |||
1855 | !VD->hasInit() && !VD->isCXXForRangeDecl()) { | |||
1856 | if (Kind == Sema::CheckConstexprKind::Diagnose) { | |||
1857 | SemaRef.Diag( | |||
1858 | VD->getLocation(), | |||
1859 | SemaRef.getLangOpts().CPlusPlus2a | |||
1860 | ? diag::warn_cxx17_compat_constexpr_local_var_no_init | |||
1861 | : diag::ext_constexpr_local_var_no_init) | |||
1862 | << isa<CXXConstructorDecl>(Dcl); | |||
1863 | } else if (!SemaRef.getLangOpts().CPlusPlus2a) { | |||
1864 | return false; | |||
1865 | } | |||
1866 | continue; | |||
1867 | } | |||
1868 | } | |||
1869 | if (Kind == Sema::CheckConstexprKind::Diagnose) { | |||
1870 | SemaRef.Diag(VD->getLocation(), | |||
1871 | SemaRef.getLangOpts().CPlusPlus14 | |||
1872 | ? diag::warn_cxx11_compat_constexpr_local_var | |||
1873 | : diag::ext_constexpr_local_var) | |||
1874 | << isa<CXXConstructorDecl>(Dcl); | |||
1875 | } else if (!SemaRef.getLangOpts().CPlusPlus14) { | |||
1876 | return false; | |||
1877 | } | |||
1878 | continue; | |||
1879 | } | |||
1880 | ||||
1881 | case Decl::NamespaceAlias: | |||
1882 | case Decl::Function: | |||
1883 | // These are disallowed in C++11 and permitted in C++1y. Allow them | |||
1884 | // everywhere as an extension. | |||
1885 | if (!Cxx1yLoc.isValid()) | |||
1886 | Cxx1yLoc = DS->getBeginLoc(); | |||
1887 | continue; | |||
1888 | ||||
1889 | default: | |||
1890 | if (Kind == Sema::CheckConstexprKind::Diagnose) { | |||
1891 | SemaRef.Diag(DS->getBeginLoc(), diag::err_constexpr_body_invalid_stmt) | |||
1892 | << isa<CXXConstructorDecl>(Dcl) << Dcl->isConsteval(); | |||
1893 | } | |||
1894 | return false; | |||
1895 | } | |||
1896 | } | |||
1897 | ||||
1898 | return true; | |||
1899 | } | |||
1900 | ||||
1901 | /// Check that the given field is initialized within a constexpr constructor. | |||
1902 | /// | |||
1903 | /// \param Dcl The constexpr constructor being checked. | |||
1904 | /// \param Field The field being checked. This may be a member of an anonymous | |||
1905 | /// struct or union nested within the class being checked. | |||
1906 | /// \param Inits All declarations, including anonymous struct/union members and | |||
1907 | /// indirect members, for which any initialization was provided. | |||
1908 | /// \param Diagnosed Whether we've emitted the error message yet. Used to attach | |||
1909 | /// multiple notes for different members to the same error. | |||
1910 | /// \param Kind Whether we're diagnosing a constructor as written or determining | |||
1911 | /// whether the formal requirements are satisfied. | |||
1912 | /// \return \c false if we're checking for validity and the constructor does | |||
1913 | /// not satisfy the requirements on a constexpr constructor. | |||
1914 | static bool CheckConstexprCtorInitializer(Sema &SemaRef, | |||
1915 | const FunctionDecl *Dcl, | |||
1916 | FieldDecl *Field, | |||
1917 | llvm::SmallSet<Decl*, 16> &Inits, | |||
1918 | bool &Diagnosed, | |||
1919 | Sema::CheckConstexprKind Kind) { | |||
1920 | // In C++20 onwards, there's nothing to check for validity. | |||
1921 | if (Kind == Sema::CheckConstexprKind::CheckValid && | |||
1922 | SemaRef.getLangOpts().CPlusPlus2a) | |||
1923 | return true; | |||
1924 | ||||
1925 | if (Field->isInvalidDecl()) | |||
1926 | return true; | |||
1927 | ||||
1928 | if (Field->isUnnamedBitfield()) | |||
1929 | return true; | |||
1930 | ||||
1931 | // Anonymous unions with no variant members and empty anonymous structs do not | |||
1932 | // need to be explicitly initialized. FIXME: Anonymous structs that contain no | |||
1933 | // indirect fields don't need initializing. | |||
1934 | if (Field->isAnonymousStructOrUnion() && | |||
1935 | (Field->getType()->isUnionType() | |||
1936 | ? !Field->getType()->getAsCXXRecordDecl()->hasVariantMembers() | |||
1937 | : Field->getType()->getAsCXXRecordDecl()->isEmpty())) | |||
1938 | return true; | |||
1939 | ||||
1940 | if (!Inits.count(Field)) { | |||
1941 | if (Kind == Sema::CheckConstexprKind::Diagnose) { | |||
1942 | if (!Diagnosed) { | |||
1943 | SemaRef.Diag(Dcl->getLocation(), | |||
1944 | SemaRef.getLangOpts().CPlusPlus2a | |||
1945 | ? diag::warn_cxx17_compat_constexpr_ctor_missing_init | |||
1946 | : diag::ext_constexpr_ctor_missing_init); | |||
1947 | Diagnosed = true; | |||
1948 | } | |||
1949 | SemaRef.Diag(Field->getLocation(), | |||
1950 | diag::note_constexpr_ctor_missing_init); | |||
1951 | } else if (!SemaRef.getLangOpts().CPlusPlus2a) { | |||
1952 | return false; | |||
1953 | } | |||
1954 | } else if (Field->isAnonymousStructOrUnion()) { | |||
1955 | const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); | |||
1956 | for (auto *I : RD->fields()) | |||
1957 | // If an anonymous union contains an anonymous struct of which any member | |||
1958 | // is initialized, all members must be initialized. | |||
1959 | if (!RD->isUnion() || Inits.count(I)) | |||
1960 | if (!CheckConstexprCtorInitializer(SemaRef, Dcl, I, Inits, Diagnosed, | |||
1961 | Kind)) | |||
1962 | return false; | |||
1963 | } | |||
1964 | return true; | |||
1965 | } | |||
1966 | ||||
1967 | /// Check the provided statement is allowed in a constexpr function | |||
1968 | /// definition. | |||
1969 | static bool | |||
1970 | CheckConstexprFunctionStmt(Sema &SemaRef, const FunctionDecl *Dcl, Stmt *S, | |||
1971 | SmallVectorImpl<SourceLocation> &ReturnStmts, | |||
1972 | SourceLocation &Cxx1yLoc, SourceLocation &Cxx2aLoc, | |||
1973 | Sema::CheckConstexprKind Kind) { | |||
1974 | // - its function-body shall be [...] a compound-statement that contains only | |||
1975 | switch (S->getStmtClass()) { | |||
1976 | case Stmt::NullStmtClass: | |||
1977 | // - null statements, | |||
1978 | return true; | |||
1979 | ||||
1980 | case Stmt::DeclStmtClass: | |||
1981 | // - static_assert-declarations | |||
1982 | // - using-declarations, | |||
1983 | // - using-directives, | |||
1984 | // - typedef declarations and alias-declarations that do not define | |||
1985 | // classes or enumerations, | |||
1986 | if (!CheckConstexprDeclStmt(SemaRef, Dcl, cast<DeclStmt>(S), Cxx1yLoc, Kind)) | |||
1987 | return false; | |||
1988 | return true; | |||
1989 | ||||
1990 | case Stmt::ReturnStmtClass: | |||
1991 | // - and exactly one return statement; | |||
1992 | if (isa<CXXConstructorDecl>(Dcl)) { | |||
1993 | // C++1y allows return statements in constexpr constructors. | |||
1994 | if (!Cxx1yLoc.isValid()) | |||
1995 | Cxx1yLoc = S->getBeginLoc(); | |||
1996 | return true; | |||
1997 | } | |||
1998 | ||||
1999 | ReturnStmts.push_back(S->getBeginLoc()); | |||
2000 | return true; | |||
2001 | ||||
2002 | case Stmt::CompoundStmtClass: { | |||
2003 | // C++1y allows compound-statements. | |||
2004 | if (!Cxx1yLoc.isValid()) | |||
2005 | Cxx1yLoc = S->getBeginLoc(); | |||
2006 | ||||
2007 | CompoundStmt *CompStmt = cast<CompoundStmt>(S); | |||
2008 | for (auto *BodyIt : CompStmt->body()) { | |||
2009 | if (!CheckConstexprFunctionStmt(SemaRef, Dcl, BodyIt, ReturnStmts, | |||
2010 | Cxx1yLoc, Cxx2aLoc, Kind)) | |||
2011 | return false; | |||
2012 | } | |||
2013 | return true; | |||
2014 | } | |||
2015 | ||||
2016 | case Stmt::AttributedStmtClass: | |||
2017 | if (!Cxx1yLoc.isValid()) | |||
2018 | Cxx1yLoc = S->getBeginLoc(); | |||
2019 | return true; | |||
2020 | ||||
2021 | case Stmt::IfStmtClass: { | |||
2022 | // C++1y allows if-statements. | |||
2023 | if (!Cxx1yLoc.isValid()) | |||
2024 | Cxx1yLoc = S->getBeginLoc(); | |||
2025 | ||||
2026 | IfStmt *If = cast<IfStmt>(S); | |||
2027 | if (!CheckConstexprFunctionStmt(SemaRef, Dcl, If->getThen(), ReturnStmts, | |||
2028 | Cxx1yLoc, Cxx2aLoc, Kind)) | |||
2029 | return false; | |||
2030 | if (If->getElse() && | |||
2031 | !CheckConstexprFunctionStmt(SemaRef, Dcl, If->getElse(), ReturnStmts, | |||
2032 | Cxx1yLoc, Cxx2aLoc, Kind)) | |||
2033 | return false; | |||
2034 | return true; | |||
2035 | } | |||
2036 | ||||
2037 | case Stmt::WhileStmtClass: | |||
2038 | case Stmt::DoStmtClass: | |||
2039 | case Stmt::ForStmtClass: | |||
2040 | case Stmt::CXXForRangeStmtClass: | |||
2041 | case Stmt::ContinueStmtClass: | |||
2042 | // C++1y allows all of these. We don't allow them as extensions in C++11, | |||
2043 | // because they don't make sense without variable mutation. | |||
2044 | if (!SemaRef.getLangOpts().CPlusPlus14) | |||
2045 | break; | |||
2046 | if (!Cxx1yLoc.isValid()) | |||
2047 | Cxx1yLoc = S->getBeginLoc(); | |||
2048 | for (Stmt *SubStmt : S->children()) | |||
2049 | if (SubStmt && | |||
2050 | !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts, | |||
2051 | Cxx1yLoc, Cxx2aLoc, Kind)) | |||
2052 | return false; | |||
2053 | return true; | |||
2054 | ||||
2055 | case Stmt::SwitchStmtClass: | |||
2056 | case Stmt::CaseStmtClass: | |||
2057 | case Stmt::DefaultStmtClass: | |||
2058 | case Stmt::BreakStmtClass: | |||
2059 | // C++1y allows switch-statements, and since they don't need variable | |||
2060 | // mutation, we can reasonably allow them in C++11 as an extension. | |||
2061 | if (!Cxx1yLoc.isValid()) | |||
2062 | Cxx1yLoc = S->getBeginLoc(); | |||
2063 | for (Stmt *SubStmt : S->children()) | |||
2064 | if (SubStmt && | |||
2065 | !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts, | |||
2066 | Cxx1yLoc, Cxx2aLoc, Kind)) | |||
2067 | return false; | |||
2068 | return true; | |||
2069 | ||||
2070 | case Stmt::GCCAsmStmtClass: | |||
2071 | case Stmt::MSAsmStmtClass: | |||
2072 | // C++2a allows inline assembly statements. | |||
2073 | case Stmt::CXXTryStmtClass: | |||
2074 | if (Cxx2aLoc.isInvalid()) | |||
2075 | Cxx2aLoc = S->getBeginLoc(); | |||
2076 | for (Stmt *SubStmt : S->children()) { | |||
2077 | if (SubStmt && | |||
2078 | !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts, | |||
2079 | Cxx1yLoc, Cxx2aLoc, Kind)) | |||
2080 | return false; | |||
2081 | } | |||
2082 | return true; | |||
2083 | ||||
2084 | case Stmt::CXXCatchStmtClass: | |||
2085 | // Do not bother checking the language mode (already covered by the | |||
2086 | // try block check). | |||
2087 | if (!CheckConstexprFunctionStmt(SemaRef, Dcl, | |||
2088 | cast<CXXCatchStmt>(S)->getHandlerBlock(), | |||
2089 | ReturnStmts, Cxx1yLoc, Cxx2aLoc, Kind)) | |||
2090 | return false; | |||
2091 | return true; | |||
2092 | ||||
2093 | default: | |||
2094 | if (!isa<Expr>(S)) | |||
2095 | break; | |||
2096 | ||||
2097 | // C++1y allows expression-statements. | |||
2098 | if (!Cxx1yLoc.isValid()) | |||
2099 | Cxx1yLoc = S->getBeginLoc(); | |||
2100 | return true; | |||
2101 | } | |||
2102 | ||||
2103 | if (Kind == Sema::CheckConstexprKind::Diagnose) { | |||
2104 | SemaRef.Diag(S->getBeginLoc(), diag::err_constexpr_body_invalid_stmt) | |||
2105 | << isa<CXXConstructorDecl>(Dcl) << Dcl->isConsteval(); | |||
2106 | } | |||
2107 | return false; | |||
2108 | } | |||
2109 | ||||
2110 | /// Check the body for the given constexpr function declaration only contains | |||
2111 | /// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. | |||
2112 | /// | |||
2113 | /// \return true if the body is OK, false if we have found or diagnosed a | |||
2114 | /// problem. | |||
2115 | static bool CheckConstexprFunctionBody(Sema &SemaRef, const FunctionDecl *Dcl, | |||
2116 | Stmt *Body, | |||
2117 | Sema::CheckConstexprKind Kind) { | |||
2118 | SmallVector<SourceLocation, 4> ReturnStmts; | |||
2119 | ||||
2120 | if (isa<CXXTryStmt>(Body)) { | |||
2121 | // C++11 [dcl.constexpr]p3: | |||
2122 | // The definition of a constexpr function shall satisfy the following | |||
2123 | // constraints: [...] | |||
2124 | // - its function-body shall be = delete, = default, or a | |||
2125 | // compound-statement | |||
2126 | // | |||
2127 | // C++11 [dcl.constexpr]p4: | |||
2128 | // In the definition of a constexpr constructor, [...] | |||
2129 | // - its function-body shall not be a function-try-block; | |||
2130 | // | |||
2131 | // This restriction is lifted in C++2a, as long as inner statements also | |||
2132 | // apply the general constexpr rules. | |||
2133 | switch (Kind) { | |||
2134 | case Sema::CheckConstexprKind::CheckValid: | |||
2135 | if (!SemaRef.getLangOpts().CPlusPlus2a) | |||
2136 | return false; | |||
2137 | break; | |||
2138 | ||||
2139 | case Sema::CheckConstexprKind::Diagnose: | |||
2140 | SemaRef.Diag(Body->getBeginLoc(), | |||
2141 | !SemaRef.getLangOpts().CPlusPlus2a | |||
2142 | ? diag::ext_constexpr_function_try_block_cxx2a | |||
2143 | : diag::warn_cxx17_compat_constexpr_function_try_block) | |||
2144 | << isa<CXXConstructorDecl>(Dcl); | |||
2145 | break; | |||
2146 | } | |||
2147 | } | |||
2148 | ||||
2149 | // - its function-body shall be [...] a compound-statement that contains only | |||
2150 | // [... list of cases ...] | |||
2151 | // | |||
2152 | // Note that walking the children here is enough to properly check for | |||
2153 | // CompoundStmt and CXXTryStmt body. | |||
2154 | SourceLocation Cxx1yLoc, Cxx2aLoc; | |||
2155 | for (Stmt *SubStmt : Body->children()) { | |||
2156 | if (SubStmt && | |||
2157 | !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts, | |||
2158 | Cxx1yLoc, Cxx2aLoc, Kind)) | |||
2159 | return false; | |||
2160 | } | |||
2161 | ||||
2162 | if (Kind == Sema::CheckConstexprKind::CheckValid) { | |||
2163 | // If this is only valid as an extension, report that we don't satisfy the | |||
2164 | // constraints of the current language. | |||
2165 | if ((Cxx2aLoc.isValid() && !SemaRef.getLangOpts().CPlusPlus2a) || | |||
2166 | (Cxx1yLoc.isValid() && !SemaRef.getLangOpts().CPlusPlus17)) | |||
2167 | return false; | |||
2168 | } else if (Cxx2aLoc.isValid()) { | |||
2169 | SemaRef.Diag(Cxx2aLoc, | |||
2170 | SemaRef.getLangOpts().CPlusPlus2a | |||
2171 | ? diag::warn_cxx17_compat_constexpr_body_invalid_stmt | |||
2172 | : diag::ext_constexpr_body_invalid_stmt_cxx2a) | |||
2173 | << isa<CXXConstructorDecl>(Dcl); | |||
2174 | } else if (Cxx1yLoc.isValid()) { | |||
2175 | SemaRef.Diag(Cxx1yLoc, | |||
2176 | SemaRef.getLangOpts().CPlusPlus14 | |||
2177 | ? diag::warn_cxx11_compat_constexpr_body_invalid_stmt | |||
2178 | : diag::ext_constexpr_body_invalid_stmt) | |||
2179 | << isa<CXXConstructorDecl>(Dcl); | |||
2180 | } | |||
2181 | ||||
2182 | if (const CXXConstructorDecl *Constructor | |||
2183 | = dyn_cast<CXXConstructorDecl>(Dcl)) { | |||
2184 | const CXXRecordDecl *RD = Constructor->getParent(); | |||
2185 | // DR1359: | |||
2186 | // - every non-variant non-static data member and base class sub-object | |||
2187 | // shall be initialized; | |||
2188 | // DR1460: | |||
2189 | // - if the class is a union having variant members, exactly one of them | |||
2190 | // shall be initialized; | |||
2191 | if (RD->isUnion()) { | |||
2192 | if (Constructor->getNumCtorInitializers() == 0 && | |||
2193 | RD->hasVariantMembers()) { | |||
2194 | if (Kind == Sema::CheckConstexprKind::Diagnose) { | |||
2195 | SemaRef.Diag( | |||
2196 | Dcl->getLocation(), | |||
2197 | SemaRef.getLangOpts().CPlusPlus2a | |||
2198 | ? diag::warn_cxx17_compat_constexpr_union_ctor_no_init | |||
2199 | : diag::ext_constexpr_union_ctor_no_init); | |||
2200 | } else if (!SemaRef.getLangOpts().CPlusPlus2a) { | |||
2201 | return false; | |||
2202 | } | |||
2203 | } | |||
2204 | } else if (!Constructor->isDependentContext() && | |||
2205 | !Constructor->isDelegatingConstructor()) { | |||
2206 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 2206, __PRETTY_FUNCTION__)); | |||
2207 | ||||
2208 | // Skip detailed checking if we have enough initializers, and we would | |||
2209 | // allow at most one initializer per member. | |||
2210 | bool AnyAnonStructUnionMembers = false; | |||
2211 | unsigned Fields = 0; | |||
2212 | for (CXXRecordDecl::field_iterator I = RD->field_begin(), | |||
2213 | E = RD->field_end(); I != E; ++I, ++Fields) { | |||
2214 | if (I->isAnonymousStructOrUnion()) { | |||
2215 | AnyAnonStructUnionMembers = true; | |||
2216 | break; | |||
2217 | } | |||
2218 | } | |||
2219 | // DR1460: | |||
2220 | // - if the class is a union-like class, but is not a union, for each of | |||
2221 | // its anonymous union members having variant members, exactly one of | |||
2222 | // them shall be initialized; | |||
2223 | if (AnyAnonStructUnionMembers || | |||
2224 | Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { | |||
2225 | // Check initialization of non-static data members. Base classes are | |||
2226 | // always initialized so do not need to be checked. Dependent bases | |||
2227 | // might not have initializers in the member initializer list. | |||
2228 | llvm::SmallSet<Decl*, 16> Inits; | |||
2229 | for (const auto *I: Constructor->inits()) { | |||
2230 | if (FieldDecl *FD = I->getMember()) | |||
2231 | Inits.insert(FD); | |||
2232 | else if (IndirectFieldDecl *ID = I->getIndirectMember()) | |||
2233 | Inits.insert(ID->chain_begin(), ID->chain_end()); | |||
2234 | } | |||
2235 | ||||
2236 | bool Diagnosed = false; | |||
2237 | for (auto *I : RD->fields()) | |||
2238 | if (!CheckConstexprCtorInitializer(SemaRef, Dcl, I, Inits, Diagnosed, | |||
2239 | Kind)) | |||
2240 | return false; | |||
2241 | } | |||
2242 | } | |||
2243 | } else { | |||
2244 | if (ReturnStmts.empty()) { | |||
2245 | // C++1y doesn't require constexpr functions to contain a 'return' | |||
2246 | // statement. We still do, unless the return type might be void, because | |||
2247 | // otherwise if there's no return statement, the function cannot | |||
2248 | // be used in a core constant expression. | |||
2249 | bool OK = SemaRef.getLangOpts().CPlusPlus14 && | |||
2250 | (Dcl->getReturnType()->isVoidType() || | |||
2251 | Dcl->getReturnType()->isDependentType()); | |||
2252 | switch (Kind) { | |||
2253 | case Sema::CheckConstexprKind::Diagnose: | |||
2254 | SemaRef.Diag(Dcl->getLocation(), | |||
2255 | OK ? diag::warn_cxx11_compat_constexpr_body_no_return | |||
2256 | : diag::err_constexpr_body_no_return) | |||
2257 | << Dcl->isConsteval(); | |||
2258 | if (!OK) | |||
2259 | return false; | |||
2260 | break; | |||
2261 | ||||
2262 | case Sema::CheckConstexprKind::CheckValid: | |||
2263 | // The formal requirements don't include this rule in C++14, even | |||
2264 | // though the "must be able to produce a constant expression" rules | |||
2265 | // still imply it in some cases. | |||
2266 | if (!SemaRef.getLangOpts().CPlusPlus14) | |||
2267 | return false; | |||
2268 | break; | |||
2269 | } | |||
2270 | } else if (ReturnStmts.size() > 1) { | |||
2271 | switch (Kind) { | |||
2272 | case Sema::CheckConstexprKind::Diagnose: | |||
2273 | SemaRef.Diag( | |||
2274 | ReturnStmts.back(), | |||
2275 | SemaRef.getLangOpts().CPlusPlus14 | |||
2276 | ? diag::warn_cxx11_compat_constexpr_body_multiple_return | |||
2277 | : diag::ext_constexpr_body_multiple_return); | |||
2278 | for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) | |||
2279 | SemaRef.Diag(ReturnStmts[I], | |||
2280 | diag::note_constexpr_body_previous_return); | |||
2281 | break; | |||
2282 | ||||
2283 | case Sema::CheckConstexprKind::CheckValid: | |||
2284 | if (!SemaRef.getLangOpts().CPlusPlus14) | |||
2285 | return false; | |||
2286 | break; | |||
2287 | } | |||
2288 | } | |||
2289 | } | |||
2290 | ||||
2291 | // C++11 [dcl.constexpr]p5: | |||
2292 | // if no function argument values exist such that the function invocation | |||
2293 | // substitution would produce a constant expression, the program is | |||
2294 | // ill-formed; no diagnostic required. | |||
2295 | // C++11 [dcl.constexpr]p3: | |||
2296 | // - every constructor call and implicit conversion used in initializing the | |||
2297 | // return value shall be one of those allowed in a constant expression. | |||
2298 | // C++11 [dcl.constexpr]p4: | |||
2299 | // - every constructor involved in initializing non-static data members and | |||
2300 | // base class sub-objects shall be a constexpr constructor. | |||
2301 | // | |||
2302 | // Note that this rule is distinct from the "requirements for a constexpr | |||
2303 | // function", so is not checked in CheckValid mode. | |||
2304 | SmallVector<PartialDiagnosticAt, 8> Diags; | |||
2305 | if (Kind == Sema::CheckConstexprKind::Diagnose && | |||
2306 | !Expr::isPotentialConstantExpr(Dcl, Diags)) { | |||
2307 | SemaRef.Diag(Dcl->getLocation(), | |||
2308 | diag::ext_constexpr_function_never_constant_expr) | |||
2309 | << isa<CXXConstructorDecl>(Dcl) << Dcl->isConsteval(); | |||
2310 | for (size_t I = 0, N = Diags.size(); I != N; ++I) | |||
2311 | SemaRef.Diag(Diags[I].first, Diags[I].second); | |||
2312 | // Don't return false here: we allow this for compatibility in | |||
2313 | // system headers. | |||
2314 | } | |||
2315 | ||||
2316 | return true; | |||
2317 | } | |||
2318 | ||||
2319 | /// Get the class that is directly named by the current context. This is the | |||
2320 | /// class for which an unqualified-id in this scope could name a constructor | |||
2321 | /// or destructor. | |||
2322 | /// | |||
2323 | /// If the scope specifier denotes a class, this will be that class. | |||
2324 | /// If the scope specifier is empty, this will be the class whose | |||
2325 | /// member-specification we are currently within. Otherwise, there | |||
2326 | /// is no such class. | |||
2327 | CXXRecordDecl *Sema::getCurrentClass(Scope *, const CXXScopeSpec *SS) { | |||
2328 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 2328, __PRETTY_FUNCTION__)); | |||
2329 | ||||
2330 | if (SS && SS->isInvalid()) | |||
2331 | return nullptr; | |||
2332 | ||||
2333 | if (SS && SS->isNotEmpty()) { | |||
2334 | DeclContext *DC = computeDeclContext(*SS, true); | |||
2335 | return dyn_cast_or_null<CXXRecordDecl>(DC); | |||
2336 | } | |||
2337 | ||||
2338 | return dyn_cast_or_null<CXXRecordDecl>(CurContext); | |||
2339 | } | |||
2340 | ||||
2341 | /// isCurrentClassName - Determine whether the identifier II is the | |||
2342 | /// name of the class type currently being defined. In the case of | |||
2343 | /// nested classes, this will only return true if II is the name of | |||
2344 | /// the innermost class. | |||
2345 | bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *S, | |||
2346 | const CXXScopeSpec *SS) { | |||
2347 | CXXRecordDecl *CurDecl = getCurrentClass(S, SS); | |||
2348 | return CurDecl && &II == CurDecl->getIdentifier(); | |||
2349 | } | |||
2350 | ||||
2351 | /// Determine whether the identifier II is a typo for the name of | |||
2352 | /// the class type currently being defined. If so, update it to the identifier | |||
2353 | /// that should have been used. | |||
2354 | bool Sema::isCurrentClassNameTypo(IdentifierInfo *&II, const CXXScopeSpec *SS) { | |||
2355 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 2355, __PRETTY_FUNCTION__)); | |||
2356 | ||||
2357 | if (!getLangOpts().SpellChecking) | |||
2358 | return false; | |||
2359 | ||||
2360 | CXXRecordDecl *CurDecl; | |||
2361 | if (SS && SS->isSet() && !SS->isInvalid()) { | |||
2362 | DeclContext *DC = computeDeclContext(*SS, true); | |||
2363 | CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); | |||
2364 | } else | |||
2365 | CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); | |||
2366 | ||||
2367 | if (CurDecl && CurDecl->getIdentifier() && II != CurDecl->getIdentifier() && | |||
2368 | 3 * II->getName().edit_distance(CurDecl->getIdentifier()->getName()) | |||
2369 | < II->getLength()) { | |||
2370 | II = CurDecl->getIdentifier(); | |||
2371 | return true; | |||
2372 | } | |||
2373 | ||||
2374 | return false; | |||
2375 | } | |||
2376 | ||||
2377 | /// Determine whether the given class is a base class of the given | |||
2378 | /// class, including looking at dependent bases. | |||
2379 | static bool findCircularInheritance(const CXXRecordDecl *Class, | |||
2380 | const CXXRecordDecl *Current) { | |||
2381 | SmallVector<const CXXRecordDecl*, 8> Queue; | |||
2382 | ||||
2383 | Class = Class->getCanonicalDecl(); | |||
2384 | while (true) { | |||
2385 | for (const auto &I : Current->bases()) { | |||
2386 | CXXRecordDecl *Base = I.getType()->getAsCXXRecordDecl(); | |||
2387 | if (!Base) | |||
2388 | continue; | |||
2389 | ||||
2390 | Base = Base->getDefinition(); | |||
2391 | if (!Base) | |||
2392 | continue; | |||
2393 | ||||
2394 | if (Base->getCanonicalDecl() == Class) | |||
2395 | return true; | |||
2396 | ||||
2397 | Queue.push_back(Base); | |||
2398 | } | |||
2399 | ||||
2400 | if (Queue.empty()) | |||
2401 | return false; | |||
2402 | ||||
2403 | Current = Queue.pop_back_val(); | |||
2404 | } | |||
2405 | ||||
2406 | return false; | |||
2407 | } | |||
2408 | ||||
2409 | /// Check the validity of a C++ base class specifier. | |||
2410 | /// | |||
2411 | /// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics | |||
2412 | /// and returns NULL otherwise. | |||
2413 | CXXBaseSpecifier * | |||
2414 | Sema::CheckBaseSpecifier(CXXRecordDecl *Class, | |||
2415 | SourceRange SpecifierRange, | |||
2416 | bool Virtual, AccessSpecifier Access, | |||
2417 | TypeSourceInfo *TInfo, | |||
2418 | SourceLocation EllipsisLoc) { | |||
2419 | QualType BaseType = TInfo->getType(); | |||
2420 | ||||
2421 | // C++ [class.union]p1: | |||
2422 | // A union shall not have base classes. | |||
2423 | if (Class->isUnion()) { | |||
2424 | Diag(Class->getLocation(), diag::err_base_clause_on_union) | |||
2425 | << SpecifierRange; | |||
2426 | return nullptr; | |||
2427 | } | |||
2428 | ||||
2429 | if (EllipsisLoc.isValid() && | |||
2430 | !TInfo->getType()->containsUnexpandedParameterPack()) { | |||
2431 | Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) | |||
2432 | << TInfo->getTypeLoc().getSourceRange(); | |||
2433 | EllipsisLoc = SourceLocation(); | |||
2434 | } | |||
2435 | ||||
2436 | SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); | |||
2437 | ||||
2438 | if (BaseType->isDependentType()) { | |||
2439 | // Make sure that we don't have circular inheritance among our dependent | |||
2440 | // bases. For non-dependent bases, the check for completeness below handles | |||
2441 | // this. | |||
2442 | if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { | |||
2443 | if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || | |||
2444 | ((BaseDecl = BaseDecl->getDefinition()) && | |||
2445 | findCircularInheritance(Class, BaseDecl))) { | |||
2446 | Diag(BaseLoc, diag::err_circular_inheritance) | |||
2447 | << BaseType << Context.getTypeDeclType(Class); | |||
2448 | ||||
2449 | if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) | |||
2450 | Diag(BaseDecl->getLocation(), diag::note_previous_decl) | |||
2451 | << BaseType; | |||
2452 | ||||
2453 | return nullptr; | |||
2454 | } | |||
2455 | } | |||
2456 | ||||
2457 | return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, | |||
2458 | Class->getTagKind() == TTK_Class, | |||
2459 | Access, TInfo, EllipsisLoc); | |||
2460 | } | |||
2461 | ||||
2462 | // Base specifiers must be record types. | |||
2463 | if (!BaseType->isRecordType()) { | |||
2464 | Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; | |||
2465 | return nullptr; | |||
2466 | } | |||
2467 | ||||
2468 | // C++ [class.union]p1: | |||
2469 | // A union shall not be used as a base class. | |||
2470 | if (BaseType->isUnionType()) { | |||
2471 | Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; | |||
2472 | return nullptr; | |||
2473 | } | |||
2474 | ||||
2475 | // For the MS ABI, propagate DLL attributes to base class templates. | |||
2476 | if (Context.getTargetInfo().getCXXABI().isMicrosoft()) { | |||
2477 | if (Attr *ClassAttr = getDLLAttr(Class)) { | |||
2478 | if (auto *BaseTemplate = dyn_cast_or_null<ClassTemplateSpecializationDecl>( | |||
2479 | BaseType->getAsCXXRecordDecl())) { | |||
2480 | propagateDLLAttrToBaseClassTemplate(Class, ClassAttr, BaseTemplate, | |||
2481 | BaseLoc); | |||
2482 | } | |||
2483 | } | |||
2484 | } | |||
2485 | ||||
2486 | // C++ [class.derived]p2: | |||
2487 | // The class-name in a base-specifier shall not be an incompletely | |||
2488 | // defined class. | |||
2489 | if (RequireCompleteType(BaseLoc, BaseType, | |||
2490 | diag::err_incomplete_base_class, SpecifierRange)) { | |||
2491 | Class->setInvalidDecl(); | |||
2492 | return nullptr; | |||
2493 | } | |||
2494 | ||||
2495 | // If the base class is polymorphic or isn't empty, the new one is/isn't, too. | |||
2496 | RecordDecl *BaseDecl = BaseType->castAs<RecordType>()->getDecl(); | |||
2497 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 2497, __PRETTY_FUNCTION__)); | |||
2498 | BaseDecl = BaseDecl->getDefinition(); | |||
2499 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 2499, __PRETTY_FUNCTION__)); | |||
2500 | CXXRecordDecl *CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); | |||
2501 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 2501, __PRETTY_FUNCTION__)); | |||
2502 | ||||
2503 | // Microsoft docs say: | |||
2504 | // "If a base-class has a code_seg attribute, derived classes must have the | |||
2505 | // same attribute." | |||
2506 | const auto *BaseCSA = CXXBaseDecl->getAttr<CodeSegAttr>(); | |||
2507 | const auto *DerivedCSA = Class->getAttr<CodeSegAttr>(); | |||
2508 | if ((DerivedCSA || BaseCSA) && | |||
2509 | (!BaseCSA || !DerivedCSA || BaseCSA->getName() != DerivedCSA->getName())) { | |||
2510 | Diag(Class->getLocation(), diag::err_mismatched_code_seg_base); | |||
2511 | Diag(CXXBaseDecl->getLocation(), diag::note_base_class_specified_here) | |||
2512 | << CXXBaseDecl; | |||
2513 | return nullptr; | |||
2514 | } | |||
2515 | ||||
2516 | // A class which contains a flexible array member is not suitable for use as a | |||
2517 | // base class: | |||
2518 | // - If the layout determines that a base comes before another base, | |||
2519 | // the flexible array member would index into the subsequent base. | |||
2520 | // - If the layout determines that base comes before the derived class, | |||
2521 | // the flexible array member would index into the derived class. | |||
2522 | if (CXXBaseDecl->hasFlexibleArrayMember()) { | |||
2523 | Diag(BaseLoc, diag::err_base_class_has_flexible_array_member) | |||
2524 | << CXXBaseDecl->getDeclName(); | |||
2525 | return nullptr; | |||
2526 | } | |||
2527 | ||||
2528 | // C++ [class]p3: | |||
2529 | // If a class is marked final and it appears as a base-type-specifier in | |||
2530 | // base-clause, the program is ill-formed. | |||
2531 | if (FinalAttr *FA = CXXBaseDecl->getAttr<FinalAttr>()) { | |||
2532 | Diag(BaseLoc, diag::err_class_marked_final_used_as_base) | |||
2533 | << CXXBaseDecl->getDeclName() | |||
2534 | << FA->isSpelledAsSealed(); | |||
2535 | Diag(CXXBaseDecl->getLocation(), diag::note_entity_declared_at) | |||
2536 | << CXXBaseDecl->getDeclName() << FA->getRange(); | |||
2537 | return nullptr; | |||
2538 | } | |||
2539 | ||||
2540 | if (BaseDecl->isInvalidDecl()) | |||
2541 | Class->setInvalidDecl(); | |||
2542 | ||||
2543 | // Create the base specifier. | |||
2544 | return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, | |||
2545 | Class->getTagKind() == TTK_Class, | |||
2546 | Access, TInfo, EllipsisLoc); | |||
2547 | } | |||
2548 | ||||
2549 | /// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is | |||
2550 | /// one entry in the base class list of a class specifier, for | |||
2551 | /// example: | |||
2552 | /// class foo : public bar, virtual private baz { | |||
2553 | /// 'public bar' and 'virtual private baz' are each base-specifiers. | |||
2554 | BaseResult | |||
2555 | Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, | |||
2556 | ParsedAttributes &Attributes, | |||
2557 | bool Virtual, AccessSpecifier Access, | |||
2558 | ParsedType basetype, SourceLocation BaseLoc, | |||
2559 | SourceLocation EllipsisLoc) { | |||
2560 | if (!classdecl) | |||
2561 | return true; | |||
2562 | ||||
2563 | AdjustDeclIfTemplate(classdecl); | |||
2564 | CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); | |||
2565 | if (!Class) | |||
2566 | return true; | |||
2567 | ||||
2568 | // We haven't yet attached the base specifiers. | |||
2569 | Class->setIsParsingBaseSpecifiers(); | |||
2570 | ||||
2571 | // We do not support any C++11 attributes on base-specifiers yet. | |||
2572 | // Diagnose any attributes we see. | |||
2573 | for (const ParsedAttr &AL : Attributes) { | |||
2574 | if (AL.isInvalid() || AL.getKind() == ParsedAttr::IgnoredAttribute) | |||
2575 | continue; | |||
2576 | Diag(AL.getLoc(), AL.getKind() == ParsedAttr::UnknownAttribute | |||
2577 | ? (unsigned)diag::warn_unknown_attribute_ignored | |||
2578 | : (unsigned)diag::err_base_specifier_attribute) | |||
2579 | << AL; | |||
2580 | } | |||
2581 | ||||
2582 | TypeSourceInfo *TInfo = nullptr; | |||
2583 | GetTypeFromParser(basetype, &TInfo); | |||
2584 | ||||
2585 | if (EllipsisLoc.isInvalid() && | |||
2586 | DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, | |||
2587 | UPPC_BaseType)) | |||
2588 | return true; | |||
2589 | ||||
2590 | if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, | |||
2591 | Virtual, Access, TInfo, | |||
2592 | EllipsisLoc)) | |||
2593 | return BaseSpec; | |||
2594 | else | |||
2595 | Class->setInvalidDecl(); | |||
2596 | ||||
2597 | return true; | |||
2598 | } | |||
2599 | ||||
2600 | /// Use small set to collect indirect bases. As this is only used | |||
2601 | /// locally, there's no need to abstract the small size parameter. | |||
2602 | typedef llvm::SmallPtrSet<QualType, 4> IndirectBaseSet; | |||
2603 | ||||
2604 | /// Recursively add the bases of Type. Don't add Type itself. | |||
2605 | static void | |||
2606 | NoteIndirectBases(ASTContext &Context, IndirectBaseSet &Set, | |||
2607 | const QualType &Type) | |||
2608 | { | |||
2609 | // Even though the incoming type is a base, it might not be | |||
2610 | // a class -- it could be a template parm, for instance. | |||
2611 | if (auto Rec = Type->getAs<RecordType>()) { | |||
2612 | auto Decl = Rec->getAsCXXRecordDecl(); | |||
2613 | ||||
2614 | // Iterate over its bases. | |||
2615 | for (const auto &BaseSpec : Decl->bases()) { | |||
2616 | QualType Base = Context.getCanonicalType(BaseSpec.getType()) | |||
2617 | .getUnqualifiedType(); | |||
2618 | if (Set.insert(Base).second) | |||
2619 | // If we've not already seen it, recurse. | |||
2620 | NoteIndirectBases(Context, Set, Base); | |||
2621 | } | |||
2622 | } | |||
2623 | } | |||
2624 | ||||
2625 | /// Performs the actual work of attaching the given base class | |||
2626 | /// specifiers to a C++ class. | |||
2627 | bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, | |||
2628 | MutableArrayRef<CXXBaseSpecifier *> Bases) { | |||
2629 | if (Bases.empty()) | |||
2630 | return false; | |||
2631 | ||||
2632 | // Used to keep track of which base types we have already seen, so | |||
2633 | // that we can properly diagnose redundant direct base types. Note | |||
2634 | // that the key is always the unqualified canonical type of the base | |||
2635 | // class. | |||
2636 | std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; | |||
2637 | ||||
2638 | // Used to track indirect bases so we can see if a direct base is | |||
2639 | // ambiguous. | |||
2640 | IndirectBaseSet IndirectBaseTypes; | |||
2641 | ||||
2642 | // Copy non-redundant base specifiers into permanent storage. | |||
2643 | unsigned NumGoodBases = 0; | |||
2644 | bool Invalid = false; | |||
2645 | for (unsigned idx = 0; idx < Bases.size(); ++idx) { | |||
2646 | QualType NewBaseType | |||
2647 | = Context.getCanonicalType(Bases[idx]->getType()); | |||
2648 | NewBaseType = NewBaseType.getLocalUnqualifiedType(); | |||
2649 | ||||
2650 | CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; | |||
2651 | if (KnownBase) { | |||
2652 | // C++ [class.mi]p3: | |||
2653 | // A class shall not be specified as a direct base class of a | |||
2654 | // derived class more than once. | |||
2655 | Diag(Bases[idx]->getBeginLoc(), diag::err_duplicate_base_class) | |||
2656 | << KnownBase->getType() << Bases[idx]->getSourceRange(); | |||
2657 | ||||
2658 | // Delete the duplicate base class specifier; we're going to | |||
2659 | // overwrite its pointer later. | |||
2660 | Context.Deallocate(Bases[idx]); | |||
2661 | ||||
2662 | Invalid = true; | |||
2663 | } else { | |||
2664 | // Okay, add this new base class. | |||
2665 | KnownBase = Bases[idx]; | |||
2666 | Bases[NumGoodBases++] = Bases[idx]; | |||
2667 | ||||
2668 | // Note this base's direct & indirect bases, if there could be ambiguity. | |||
2669 | if (Bases.size() > 1) | |||
2670 | NoteIndirectBases(Context, IndirectBaseTypes, NewBaseType); | |||
2671 | ||||
2672 | if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { | |||
2673 | const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); | |||
2674 | if (Class->isInterface() && | |||
2675 | (!RD->isInterfaceLike() || | |||
2676 | KnownBase->getAccessSpecifier() != AS_public)) { | |||
2677 | // The Microsoft extension __interface does not permit bases that | |||
2678 | // are not themselves public interfaces. | |||
2679 | Diag(KnownBase->getBeginLoc(), diag::err_invalid_base_in_interface) | |||
2680 | << getRecordDiagFromTagKind(RD->getTagKind()) << RD | |||
2681 | << RD->getSourceRange(); | |||
2682 | Invalid = true; | |||
2683 | } | |||
2684 | if (RD->hasAttr<WeakAttr>()) | |||
2685 | Class->addAttr(WeakAttr::CreateImplicit(Context)); | |||
2686 | } | |||
2687 | } | |||
2688 | } | |||
2689 | ||||
2690 | // Attach the remaining base class specifiers to the derived class. | |||
2691 | Class->setBases(Bases.data(), NumGoodBases); | |||
2692 | ||||
2693 | // Check that the only base classes that are duplicate are virtual. | |||
2694 | for (unsigned idx = 0; idx < NumGoodBases; ++idx) { | |||
2695 | // Check whether this direct base is inaccessible due to ambiguity. | |||
2696 | QualType BaseType = Bases[idx]->getType(); | |||
2697 | ||||
2698 | // Skip all dependent types in templates being used as base specifiers. | |||
2699 | // Checks below assume that the base specifier is a CXXRecord. | |||
2700 | if (BaseType->isDependentType()) | |||
2701 | continue; | |||
2702 | ||||
2703 | CanQualType CanonicalBase = Context.getCanonicalType(BaseType) | |||
2704 | .getUnqualifiedType(); | |||
2705 | ||||
2706 | if (IndirectBaseTypes.count(CanonicalBase)) { | |||
2707 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, | |||
2708 | /*DetectVirtual=*/true); | |||
2709 | bool found | |||
2710 | = Class->isDerivedFrom(CanonicalBase->getAsCXXRecordDecl(), Paths); | |||
2711 | assert(found)((found) ? static_cast<void> (0) : __assert_fail ("found" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 2711, __PRETTY_FUNCTION__)); | |||
2712 | (void)found; | |||
2713 | ||||
2714 | if (Paths.isAmbiguous(CanonicalBase)) | |||
2715 | Diag(Bases[idx]->getBeginLoc(), diag::warn_inaccessible_base_class) | |||
2716 | << BaseType << getAmbiguousPathsDisplayString(Paths) | |||
2717 | << Bases[idx]->getSourceRange(); | |||
2718 | else | |||
2719 | assert(Bases[idx]->isVirtual())((Bases[idx]->isVirtual()) ? static_cast<void> (0) : __assert_fail ("Bases[idx]->isVirtual()", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 2719, __PRETTY_FUNCTION__)); | |||
2720 | } | |||
2721 | ||||
2722 | // Delete the base class specifier, since its data has been copied | |||
2723 | // into the CXXRecordDecl. | |||
2724 | Context.Deallocate(Bases[idx]); | |||
2725 | } | |||
2726 | ||||
2727 | return Invalid; | |||
2728 | } | |||
2729 | ||||
2730 | /// ActOnBaseSpecifiers - Attach the given base specifiers to the | |||
2731 | /// class, after checking whether there are any duplicate base | |||
2732 | /// classes. | |||
2733 | void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, | |||
2734 | MutableArrayRef<CXXBaseSpecifier *> Bases) { | |||
2735 | if (!ClassDecl || Bases.empty()) | |||
2736 | return; | |||
2737 | ||||
2738 | AdjustDeclIfTemplate(ClassDecl); | |||
2739 | AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), Bases); | |||
2740 | } | |||
2741 | ||||
2742 | /// Determine whether the type \p Derived is a C++ class that is | |||
2743 | /// derived from the type \p Base. | |||
2744 | bool Sema::IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base) { | |||
2745 | if (!getLangOpts().CPlusPlus) | |||
2746 | return false; | |||
2747 | ||||
2748 | CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); | |||
2749 | if (!DerivedRD) | |||
2750 | return false; | |||
2751 | ||||
2752 | CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); | |||
2753 | if (!BaseRD) | |||
2754 | return false; | |||
2755 | ||||
2756 | // If either the base or the derived type is invalid, don't try to | |||
2757 | // check whether one is derived from the other. | |||
2758 | if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl()) | |||
2759 | return false; | |||
2760 | ||||
2761 | // FIXME: In a modules build, do we need the entire path to be visible for us | |||
2762 | // to be able to use the inheritance relationship? | |||
2763 | if (!isCompleteType(Loc, Derived) && !DerivedRD->isBeingDefined()) | |||
2764 | return false; | |||
2765 | ||||
2766 | return DerivedRD->isDerivedFrom(BaseRD); | |||
2767 | } | |||
2768 | ||||
2769 | /// Determine whether the type \p Derived is a C++ class that is | |||
2770 | /// derived from the type \p Base. | |||
2771 | bool Sema::IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base, | |||
2772 | CXXBasePaths &Paths) { | |||
2773 | if (!getLangOpts().CPlusPlus) | |||
2774 | return false; | |||
2775 | ||||
2776 | CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); | |||
2777 | if (!DerivedRD) | |||
2778 | return false; | |||
2779 | ||||
2780 | CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); | |||
2781 | if (!BaseRD) | |||
2782 | return false; | |||
2783 | ||||
2784 | if (!isCompleteType(Loc, Derived) && !DerivedRD->isBeingDefined()) | |||
2785 | return false; | |||
2786 | ||||
2787 | return DerivedRD->isDerivedFrom(BaseRD, Paths); | |||
2788 | } | |||
2789 | ||||
2790 | static void BuildBasePathArray(const CXXBasePath &Path, | |||
2791 | CXXCastPath &BasePathArray) { | |||
2792 | // We first go backward and check if we have a virtual base. | |||
2793 | // FIXME: It would be better if CXXBasePath had the base specifier for | |||
2794 | // the nearest virtual base. | |||
2795 | unsigned Start = 0; | |||
2796 | for (unsigned I = Path.size(); I != 0; --I) { | |||
2797 | if (Path[I - 1].Base->isVirtual()) { | |||
2798 | Start = I - 1; | |||
2799 | break; | |||
2800 | } | |||
2801 | } | |||
2802 | ||||
2803 | // Now add all bases. | |||
2804 | for (unsigned I = Start, E = Path.size(); I != E; ++I) | |||
2805 | BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); | |||
2806 | } | |||
2807 | ||||
2808 | ||||
2809 | void Sema::BuildBasePathArray(const CXXBasePaths &Paths, | |||
2810 | CXXCastPath &BasePathArray) { | |||
2811 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 2811, __PRETTY_FUNCTION__)); | |||
2812 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 2812, __PRETTY_FUNCTION__)); | |||
2813 | return ::BuildBasePathArray(Paths.front(), BasePathArray); | |||
2814 | } | |||
2815 | /// CheckDerivedToBaseConversion - Check whether the Derived-to-Base | |||
2816 | /// conversion (where Derived and Base are class types) is | |||
2817 | /// well-formed, meaning that the conversion is unambiguous (and | |||
2818 | /// that all of the base classes are accessible). Returns true | |||
2819 | /// and emits a diagnostic if the code is ill-formed, returns false | |||
2820 | /// otherwise. Loc is the location where this routine should point to | |||
2821 | /// if there is an error, and Range is the source range to highlight | |||
2822 | /// if there is an error. | |||
2823 | /// | |||
2824 | /// If either InaccessibleBaseID or AmbigiousBaseConvID are 0, then the | |||
2825 | /// diagnostic for the respective type of error will be suppressed, but the | |||
2826 | /// check for ill-formed code will still be performed. | |||
2827 | bool | |||
2828 | Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, | |||
2829 | unsigned InaccessibleBaseID, | |||
2830 | unsigned AmbigiousBaseConvID, | |||
2831 | SourceLocation Loc, SourceRange Range, | |||
2832 | DeclarationName Name, | |||
2833 | CXXCastPath *BasePath, | |||
2834 | bool IgnoreAccess) { | |||
2835 | // First, determine whether the path from Derived to Base is | |||
2836 | // ambiguous. This is slightly more expensive than checking whether | |||
2837 | // the Derived to Base conversion exists, because here we need to | |||
2838 | // explore multiple paths to determine if there is an ambiguity. | |||
2839 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, | |||
2840 | /*DetectVirtual=*/false); | |||
2841 | bool DerivationOkay = IsDerivedFrom(Loc, Derived, Base, Paths); | |||
2842 | if (!DerivationOkay) | |||
2843 | return true; | |||
2844 | ||||
2845 | const CXXBasePath *Path = nullptr; | |||
2846 | if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) | |||
2847 | Path = &Paths.front(); | |||
2848 | ||||
2849 | // For MSVC compatibility, check if Derived directly inherits from Base. Clang | |||
2850 | // warns about this hierarchy under -Winaccessible-base, but MSVC allows the | |||
2851 | // user to access such bases. | |||
2852 | if (!Path && getLangOpts().MSVCCompat) { | |||
2853 | for (const CXXBasePath &PossiblePath : Paths) { | |||
2854 | if (PossiblePath.size() == 1) { | |||
2855 | Path = &PossiblePath; | |||
2856 | if (AmbigiousBaseConvID) | |||
2857 | Diag(Loc, diag::ext_ms_ambiguous_direct_base) | |||
2858 | << Base << Derived << Range; | |||
2859 | break; | |||
2860 | } | |||
2861 | } | |||
2862 | } | |||
2863 | ||||
2864 | if (Path) { | |||
2865 | if (!IgnoreAccess) { | |||
2866 | // Check that the base class can be accessed. | |||
2867 | switch ( | |||
2868 | CheckBaseClassAccess(Loc, Base, Derived, *Path, InaccessibleBaseID)) { | |||
2869 | case AR_inaccessible: | |||
2870 | return true; | |||
2871 | case AR_accessible: | |||
2872 | case AR_dependent: | |||
2873 | case AR_delayed: | |||
2874 | break; | |||
2875 | } | |||
2876 | } | |||
2877 | ||||
2878 | // Build a base path if necessary. | |||
2879 | if (BasePath) | |||
2880 | ::BuildBasePathArray(*Path, *BasePath); | |||
2881 | return false; | |||
2882 | } | |||
2883 | ||||
2884 | if (AmbigiousBaseConvID) { | |||
2885 | // We know that the derived-to-base conversion is ambiguous, and | |||
2886 | // we're going to produce a diagnostic. Perform the derived-to-base | |||
2887 | // search just one more time to compute all of the possible paths so | |||
2888 | // that we can print them out. This is more expensive than any of | |||
2889 | // the previous derived-to-base checks we've done, but at this point | |||
2890 | // performance isn't as much of an issue. | |||
2891 | Paths.clear(); | |||
2892 | Paths.setRecordingPaths(true); | |||
2893 | bool StillOkay = IsDerivedFrom(Loc, Derived, Base, Paths); | |||
2894 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 2894, __PRETTY_FUNCTION__)); | |||
2895 | (void)StillOkay; | |||
2896 | ||||
2897 | // Build up a textual representation of the ambiguous paths, e.g., | |||
2898 | // D -> B -> A, that will be used to illustrate the ambiguous | |||
2899 | // conversions in the diagnostic. We only print one of the paths | |||
2900 | // to each base class subobject. | |||
2901 | std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); | |||
2902 | ||||
2903 | Diag(Loc, AmbigiousBaseConvID) | |||
2904 | << Derived << Base << PathDisplayStr << Range << Name; | |||
2905 | } | |||
2906 | return true; | |||
2907 | } | |||
2908 | ||||
2909 | bool | |||
2910 | Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, | |||
2911 | SourceLocation Loc, SourceRange Range, | |||
2912 | CXXCastPath *BasePath, | |||
2913 | bool IgnoreAccess) { | |||
2914 | return CheckDerivedToBaseConversion( | |||
2915 | Derived, Base, diag::err_upcast_to_inaccessible_base, | |||
2916 | diag::err_ambiguous_derived_to_base_conv, Loc, Range, DeclarationName(), | |||
2917 | BasePath, IgnoreAccess); | |||
2918 | } | |||
2919 | ||||
2920 | ||||
2921 | /// Builds a string representing ambiguous paths from a | |||
2922 | /// specific derived class to different subobjects of the same base | |||
2923 | /// class. | |||
2924 | /// | |||
2925 | /// This function builds a string that can be used in error messages | |||
2926 | /// to show the different paths that one can take through the | |||
2927 | /// inheritance hierarchy to go from the derived class to different | |||
2928 | /// subobjects of a base class. The result looks something like this: | |||
2929 | /// @code | |||
2930 | /// struct D -> struct B -> struct A | |||
2931 | /// struct D -> struct C -> struct A | |||
2932 | /// @endcode | |||
2933 | std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { | |||
2934 | std::string PathDisplayStr; | |||
2935 | std::set<unsigned> DisplayedPaths; | |||
2936 | for (CXXBasePaths::paths_iterator Path = Paths.begin(); | |||
2937 | Path != Paths.end(); ++Path) { | |||
2938 | if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { | |||
2939 | // We haven't displayed a path to this particular base | |||
2940 | // class subobject yet. | |||
2941 | PathDisplayStr += "\n "; | |||
2942 | PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); | |||
2943 | for (CXXBasePath::const_iterator Element = Path->begin(); | |||
2944 | Element != Path->end(); ++Element) | |||
2945 | PathDisplayStr += " -> " + Element->Base->getType().getAsString(); | |||
2946 | } | |||
2947 | } | |||
2948 | ||||
2949 | return PathDisplayStr; | |||
2950 | } | |||
2951 | ||||
2952 | //===----------------------------------------------------------------------===// | |||
2953 | // C++ class member Handling | |||
2954 | //===----------------------------------------------------------------------===// | |||
2955 | ||||
2956 | /// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. | |||
2957 | bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, SourceLocation ASLoc, | |||
2958 | SourceLocation ColonLoc, | |||
2959 | const ParsedAttributesView &Attrs) { | |||
2960 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 2960, __PRETTY_FUNCTION__)); | |||
2961 | AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, | |||
2962 | ASLoc, ColonLoc); | |||
2963 | CurContext->addHiddenDecl(ASDecl); | |||
2964 | return ProcessAccessDeclAttributeList(ASDecl, Attrs); | |||
2965 | } | |||
2966 | ||||
2967 | /// CheckOverrideControl - Check C++11 override control semantics. | |||
2968 | void Sema::CheckOverrideControl(NamedDecl *D) { | |||
2969 | if (D->isInvalidDecl()) | |||
2970 | return; | |||
2971 | ||||
2972 | // We only care about "override" and "final" declarations. | |||
2973 | if (!D->hasAttr<OverrideAttr>() && !D->hasAttr<FinalAttr>()) | |||
2974 | return; | |||
2975 | ||||
2976 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); | |||
2977 | ||||
2978 | // We can't check dependent instance methods. | |||
2979 | if (MD && MD->isInstance() && | |||
2980 | (MD->getParent()->hasAnyDependentBases() || | |||
2981 | MD->getType()->isDependentType())) | |||
2982 | return; | |||
2983 | ||||
2984 | if (MD && !MD->isVirtual()) { | |||
2985 | // If we have a non-virtual method, check if if hides a virtual method. | |||
2986 | // (In that case, it's most likely the method has the wrong type.) | |||
2987 | SmallVector<CXXMethodDecl *, 8> OverloadedMethods; | |||
2988 | FindHiddenVirtualMethods(MD, OverloadedMethods); | |||
2989 | ||||
2990 | if (!OverloadedMethods.empty()) { | |||
2991 | if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { | |||
2992 | Diag(OA->getLocation(), | |||
2993 | diag::override_keyword_hides_virtual_member_function) | |||
2994 | << "override" << (OverloadedMethods.size() > 1); | |||
2995 | } else if (FinalAttr *FA = D->getAttr<FinalAttr>()) { | |||
2996 | Diag(FA->getLocation(), | |||
2997 | diag::override_keyword_hides_virtual_member_function) | |||
2998 | << (FA->isSpelledAsSealed() ? "sealed" : "final") | |||
2999 | << (OverloadedMethods.size() > 1); | |||
3000 | } | |||
3001 | NoteHiddenVirtualMethods(MD, OverloadedMethods); | |||
3002 | MD->setInvalidDecl(); | |||
3003 | return; | |||
3004 | } | |||
3005 | // Fall through into the general case diagnostic. | |||
3006 | // FIXME: We might want to attempt typo correction here. | |||
3007 | } | |||
3008 | ||||
3009 | if (!MD || !MD->isVirtual()) { | |||
3010 | if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { | |||
3011 | Diag(OA->getLocation(), | |||
3012 | diag::override_keyword_only_allowed_on_virtual_member_functions) | |||
3013 | << "override" << FixItHint::CreateRemoval(OA->getLocation()); | |||
3014 | D->dropAttr<OverrideAttr>(); | |||
3015 | } | |||
3016 | if (FinalAttr *FA = D->getAttr<FinalAttr>()) { | |||
3017 | Diag(FA->getLocation(), | |||
3018 | diag::override_keyword_only_allowed_on_virtual_member_functions) | |||
3019 | << (FA->isSpelledAsSealed() ? "sealed" : "final") | |||
3020 | << FixItHint::CreateRemoval(FA->getLocation()); | |||
3021 | D->dropAttr<FinalAttr>(); | |||
3022 | } | |||
3023 | return; | |||
3024 | } | |||
3025 | ||||
3026 | // C++11 [class.virtual]p5: | |||
3027 | // If a function is marked with the virt-specifier override and | |||
3028 | // does not override a member function of a base class, the program is | |||
3029 | // ill-formed. | |||
3030 | bool HasOverriddenMethods = MD->size_overridden_methods() != 0; | |||
3031 | if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) | |||
3032 | Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) | |||
3033 | << MD->getDeclName(); | |||
3034 | } | |||
3035 | ||||
3036 | void Sema::DiagnoseAbsenceOfOverrideControl(NamedDecl *D) { | |||
3037 | if (D->isInvalidDecl() || D->hasAttr<OverrideAttr>()) | |||
3038 | return; | |||
3039 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); | |||
3040 | if (!MD || MD->isImplicit() || MD->hasAttr<FinalAttr>()) | |||
3041 | return; | |||
3042 | ||||
3043 | SourceLocation Loc = MD->getLocation(); | |||
3044 | SourceLocation SpellingLoc = Loc; | |||
3045 | if (getSourceManager().isMacroArgExpansion(Loc)) | |||
3046 | SpellingLoc = getSourceManager().getImmediateExpansionRange(Loc).getBegin(); | |||
3047 | SpellingLoc = getSourceManager().getSpellingLoc(SpellingLoc); | |||
3048 | if (SpellingLoc.isValid() && getSourceManager().isInSystemHeader(SpellingLoc)) | |||
3049 | return; | |||
3050 | ||||
3051 | if (MD->size_overridden_methods() > 0) { | |||
3052 | unsigned DiagID = isa<CXXDestructorDecl>(MD) | |||
3053 | ? diag::warn_destructor_marked_not_override_overriding | |||
3054 | : diag::warn_function_marked_not_override_overriding; | |||
3055 | Diag(MD->getLocation(), DiagID) << MD->getDeclName(); | |||
3056 | const CXXMethodDecl *OMD = *MD->begin_overridden_methods(); | |||
3057 | Diag(OMD->getLocation(), diag::note_overridden_virtual_function); | |||
3058 | } | |||
3059 | } | |||
3060 | ||||
3061 | /// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member | |||
3062 | /// function overrides a virtual member function marked 'final', according to | |||
3063 | /// C++11 [class.virtual]p4. | |||
3064 | bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, | |||
3065 | const CXXMethodDecl *Old) { | |||
3066 | FinalAttr *FA = Old->getAttr<FinalAttr>(); | |||
3067 | if (!FA) | |||
3068 | return false; | |||
3069 | ||||
3070 | Diag(New->getLocation(), diag::err_final_function_overridden) | |||
3071 | << New->getDeclName() | |||
3072 | << FA->isSpelledAsSealed(); | |||
3073 | Diag(Old->getLocation(), diag::note_overridden_virtual_function); | |||
3074 | return true; | |||
3075 | } | |||
3076 | ||||
3077 | static bool InitializationHasSideEffects(const FieldDecl &FD) { | |||
3078 | const Type *T = FD.getType()->getBaseElementTypeUnsafe(); | |||
3079 | // FIXME: Destruction of ObjC lifetime types has side-effects. | |||
3080 | if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) | |||
3081 | return !RD->isCompleteDefinition() || | |||
3082 | !RD->hasTrivialDefaultConstructor() || | |||
3083 | !RD->hasTrivialDestructor(); | |||
3084 | return false; | |||
3085 | } | |||
3086 | ||||
3087 | static const ParsedAttr *getMSPropertyAttr(const ParsedAttributesView &list) { | |||
3088 | ParsedAttributesView::const_iterator Itr = | |||
3089 | llvm::find_if(list, [](const ParsedAttr &AL) { | |||
3090 | return AL.isDeclspecPropertyAttribute(); | |||
3091 | }); | |||
3092 | if (Itr != list.end()) | |||
3093 | return &*Itr; | |||
3094 | return nullptr; | |||
3095 | } | |||
3096 | ||||
3097 | // Check if there is a field shadowing. | |||
3098 | void Sema::CheckShadowInheritedFields(const SourceLocation &Loc, | |||
3099 | DeclarationName FieldName, | |||
3100 | const CXXRecordDecl *RD, | |||
3101 | bool DeclIsField) { | |||
3102 | if (Diags.isIgnored(diag::warn_shadow_field, Loc)) | |||
3103 | return; | |||
3104 | ||||
3105 | // To record a shadowed field in a base | |||
3106 | std::map<CXXRecordDecl*, NamedDecl*> Bases; | |||
3107 | auto FieldShadowed = [&](const CXXBaseSpecifier *Specifier, | |||
3108 | CXXBasePath &Path) { | |||
3109 | const auto Base = Specifier->getType()->getAsCXXRecordDecl(); | |||
3110 | // Record an ambiguous path directly | |||
3111 | if (Bases.find(Base) != Bases.end()) | |||
3112 | return true; | |||
3113 | for (const auto Field : Base->lookup(FieldName)) { | |||
3114 | if ((isa<FieldDecl>(Field) || isa<IndirectFieldDecl>(Field)) && | |||
3115 | Field->getAccess() != AS_private) { | |||
3116 | assert(Field->getAccess() != AS_none)((Field->getAccess() != AS_none) ? static_cast<void> (0) : __assert_fail ("Field->getAccess() != AS_none", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 3116, __PRETTY_FUNCTION__)); | |||
3117 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 3117, __PRETTY_FUNCTION__)); | |||
3118 | Bases[Base] = Field; | |||
3119 | return true; | |||
3120 | } | |||
3121 | } | |||
3122 | return false; | |||
3123 | }; | |||
3124 | ||||
3125 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, | |||
3126 | /*DetectVirtual=*/true); | |||
3127 | if (!RD->lookupInBases(FieldShadowed, Paths)) | |||
3128 | return; | |||
3129 | ||||
3130 | for (const auto &P : Paths) { | |||
3131 | auto Base = P.back().Base->getType()->getAsCXXRecordDecl(); | |||
3132 | auto It = Bases.find(Base); | |||
3133 | // Skip duplicated bases | |||
3134 | if (It == Bases.end()) | |||
3135 | continue; | |||
3136 | auto BaseField = It->second; | |||
3137 | assert(BaseField->getAccess() != AS_private)((BaseField->getAccess() != AS_private) ? static_cast<void > (0) : __assert_fail ("BaseField->getAccess() != AS_private" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 3137, __PRETTY_FUNCTION__)); | |||
3138 | if (AS_none != | |||
3139 | CXXRecordDecl::MergeAccess(P.Access, BaseField->getAccess())) { | |||
3140 | Diag(Loc, diag::warn_shadow_field) | |||
3141 | << FieldName << RD << Base << DeclIsField; | |||
3142 | Diag(BaseField->getLocation(), diag::note_shadow_field); | |||
3143 | Bases.erase(It); | |||
3144 | } | |||
3145 | } | |||
3146 | } | |||
3147 | ||||
3148 | /// ActOnCXXMemberDeclarator - This is invoked when a C++ class member | |||
3149 | /// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the | |||
3150 | /// bitfield width if there is one, 'InitExpr' specifies the initializer if | |||
3151 | /// one has been parsed, and 'InitStyle' is set if an in-class initializer is | |||
3152 | /// present (but parsing it has been deferred). | |||
3153 | NamedDecl * | |||
3154 | Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, | |||
3155 | MultiTemplateParamsArg TemplateParameterLists, | |||
3156 | Expr *BW, const VirtSpecifiers &VS, | |||
3157 | InClassInitStyle InitStyle) { | |||
3158 | const DeclSpec &DS = D.getDeclSpec(); | |||
3159 | DeclarationNameInfo NameInfo = GetNameForDeclarator(D); | |||
3160 | DeclarationName Name = NameInfo.getName(); | |||
3161 | SourceLocation Loc = NameInfo.getLoc(); | |||
3162 | ||||
3163 | // For anonymous bitfields, the location should point to the type. | |||
3164 | if (Loc.isInvalid()) | |||
3165 | Loc = D.getBeginLoc(); | |||
3166 | ||||
3167 | Expr *BitWidth = static_cast<Expr*>(BW); | |||
3168 | ||||
3169 | assert(isa<CXXRecordDecl>(CurContext))((isa<CXXRecordDecl>(CurContext)) ? static_cast<void > (0) : __assert_fail ("isa<CXXRecordDecl>(CurContext)" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 3169, __PRETTY_FUNCTION__)); | |||
3170 | assert(!DS.isFriendSpecified())((!DS.isFriendSpecified()) ? static_cast<void> (0) : __assert_fail ("!DS.isFriendSpecified()", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 3170, __PRETTY_FUNCTION__)); | |||
3171 | ||||
3172 | bool isFunc = D.isDeclarationOfFunction(); | |||
3173 | const ParsedAttr *MSPropertyAttr = | |||
3174 | getMSPropertyAttr(D.getDeclSpec().getAttributes()); | |||
3175 | ||||
3176 | if (cast<CXXRecordDecl>(CurContext)->isInterface()) { | |||
3177 | // The Microsoft extension __interface only permits public member functions | |||
3178 | // and prohibits constructors, destructors, operators, non-public member | |||
3179 | // functions, static methods and data members. | |||
3180 | unsigned InvalidDecl; | |||
3181 | bool ShowDeclName = true; | |||
3182 | if (!isFunc && | |||
3183 | (DS.getStorageClassSpec() == DeclSpec::SCS_typedef || MSPropertyAttr)) | |||
3184 | InvalidDecl = 0; | |||
3185 | else if (!isFunc) | |||
3186 | InvalidDecl = 1; | |||
3187 | else if (AS != AS_public) | |||
3188 | InvalidDecl = 2; | |||
3189 | else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) | |||
3190 | InvalidDecl = 3; | |||
3191 | else switch (Name.getNameKind()) { | |||
3192 | case DeclarationName::CXXConstructorName: | |||
3193 | InvalidDecl = 4; | |||
3194 | ShowDeclName = false; | |||
3195 | break; | |||
3196 | ||||
3197 | case DeclarationName::CXXDestructorName: | |||
3198 | InvalidDecl = 5; | |||
3199 | ShowDeclName = false; | |||
3200 | break; | |||
3201 | ||||
3202 | case DeclarationName::CXXOperatorName: | |||
3203 | case DeclarationName::CXXConversionFunctionName: | |||
3204 | InvalidDecl = 6; | |||
3205 | break; | |||
3206 | ||||
3207 | default: | |||
3208 | InvalidDecl = 0; | |||
3209 | break; | |||
3210 | } | |||
3211 | ||||
3212 | if (InvalidDecl) { | |||
3213 | if (ShowDeclName) | |||
3214 | Diag(Loc, diag::err_invalid_member_in_interface) | |||
3215 | << (InvalidDecl-1) << Name; | |||
3216 | else | |||
3217 | Diag(Loc, diag::err_invalid_member_in_interface) | |||
3218 | << (InvalidDecl-1) << ""; | |||
3219 | return nullptr; | |||
3220 | } | |||
3221 | } | |||
3222 | ||||
3223 | // C++ 9.2p6: A member shall not be declared to have automatic storage | |||
3224 | // duration (auto, register) or with the extern storage-class-specifier. | |||
3225 | // C++ 7.1.1p8: The mutable specifier can be applied only to names of class | |||
3226 | // data members and cannot be applied to names declared const or static, | |||
3227 | // and cannot be applied to reference members. | |||
3228 | switch (DS.getStorageClassSpec()) { | |||
3229 | case DeclSpec::SCS_unspecified: | |||
3230 | case DeclSpec::SCS_typedef: | |||
3231 | case DeclSpec::SCS_static: | |||
3232 | break; | |||
3233 | case DeclSpec::SCS_mutable: | |||
3234 | if (isFunc) { | |||
3235 | Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); | |||
3236 | ||||
3237 | // FIXME: It would be nicer if the keyword was ignored only for this | |||
3238 | // declarator. Otherwise we could get follow-up errors. | |||
3239 | D.getMutableDeclSpec().ClearStorageClassSpecs(); | |||
3240 | } | |||
3241 | break; | |||
3242 | default: | |||
3243 | Diag(DS.getStorageClassSpecLoc(), | |||
3244 | diag::err_storageclass_invalid_for_member); | |||
3245 | D.getMutableDeclSpec().ClearStorageClassSpecs(); | |||
3246 | break; | |||
3247 | } | |||
3248 | ||||
3249 | bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || | |||
3250 | DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && | |||
3251 | !isFunc); | |||
3252 | ||||
3253 | if (DS.hasConstexprSpecifier() && isInstField) { | |||
3254 | SemaDiagnosticBuilder B = | |||
3255 | Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member); | |||
3256 | SourceLocation ConstexprLoc = DS.getConstexprSpecLoc(); | |||
3257 | if (InitStyle == ICIS_NoInit) { | |||
3258 | B << 0 << 0; | |||
3259 | if (D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) | |||
3260 | B << FixItHint::CreateRemoval(ConstexprLoc); | |||
3261 | else { | |||
3262 | B << FixItHint::CreateReplacement(ConstexprLoc, "const"); | |||
3263 | D.getMutableDeclSpec().ClearConstexprSpec(); | |||
3264 | const char *PrevSpec; | |||
3265 | unsigned DiagID; | |||
3266 | bool Failed = D.getMutableDeclSpec().SetTypeQual( | |||
3267 | DeclSpec::TQ_const, ConstexprLoc, PrevSpec, DiagID, getLangOpts()); | |||
3268 | (void)Failed; | |||
3269 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 3269, __PRETTY_FUNCTION__)); | |||
3270 | } | |||
3271 | } else { | |||
3272 | B << 1; | |||
3273 | const char *PrevSpec; | |||
3274 | unsigned DiagID; | |||
3275 | if (D.getMutableDeclSpec().SetStorageClassSpec( | |||
3276 | *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID, | |||
3277 | Context.getPrintingPolicy())) { | |||
3278 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 3279, __PRETTY_FUNCTION__)) | |||
3279 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 3279, __PRETTY_FUNCTION__)); | |||
3280 | B << 1; | |||
3281 | } else { | |||
3282 | B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static "); | |||
3283 | isInstField = false; | |||
3284 | } | |||
3285 | } | |||
3286 | } | |||
3287 | ||||
3288 | NamedDecl *Member; | |||
3289 | if (isInstField) { | |||
3290 | CXXScopeSpec &SS = D.getCXXScopeSpec(); | |||
3291 | ||||
3292 | // Data members must have identifiers for names. | |||
3293 | if (!Name.isIdentifier()) { | |||
3294 | Diag(Loc, diag::err_bad_variable_name) | |||
3295 | << Name; | |||
3296 | return nullptr; | |||
3297 | } | |||
3298 | ||||
3299 | IdentifierInfo *II = Name.getAsIdentifierInfo(); | |||
3300 | ||||
3301 | // Member field could not be with "template" keyword. | |||
3302 | // So TemplateParameterLists should be empty in this case. | |||
3303 | if (TemplateParameterLists.size()) { | |||
3304 | TemplateParameterList* TemplateParams = TemplateParameterLists[0]; | |||
3305 | if (TemplateParams->size()) { | |||
3306 | // There is no such thing as a member field template. | |||
3307 | Diag(D.getIdentifierLoc(), diag::err_template_member) | |||
3308 | << II | |||
3309 | << SourceRange(TemplateParams->getTemplateLoc(), | |||
3310 | TemplateParams->getRAngleLoc()); | |||
3311 | } else { | |||
3312 | // There is an extraneous 'template<>' for this member. | |||
3313 | Diag(TemplateParams->getTemplateLoc(), | |||
3314 | diag::err_template_member_noparams) | |||
3315 | << II | |||
3316 | << SourceRange(TemplateParams->getTemplateLoc(), | |||
3317 | TemplateParams->getRAngleLoc()); | |||
3318 | } | |||
3319 | return nullptr; | |||
3320 | } | |||
3321 | ||||
3322 | if (SS.isSet() && !SS.isInvalid()) { | |||
3323 | // The user provided a superfluous scope specifier inside a class | |||
3324 | // definition: | |||
3325 | // | |||
3326 | // class X { | |||
3327 | // int X::member; | |||
3328 | // }; | |||
3329 | if (DeclContext *DC = computeDeclContext(SS, false)) | |||
3330 | diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc(), | |||
3331 | D.getName().getKind() == | |||
3332 | UnqualifiedIdKind::IK_TemplateId); | |||
3333 | else | |||
3334 | Diag(D.getIdentifierLoc(), diag::err_member_qualification) | |||
3335 | << Name << SS.getRange(); | |||
3336 | ||||
3337 | SS.clear(); | |||
3338 | } | |||
3339 | ||||
3340 | if (MSPropertyAttr) { | |||
3341 | Member = HandleMSProperty(S, cast<CXXRecordDecl>(CurContext), Loc, D, | |||
3342 | BitWidth, InitStyle, AS, *MSPropertyAttr); | |||
3343 | if (!Member) | |||
3344 | return nullptr; | |||
3345 | isInstField = false; | |||
3346 | } else { | |||
3347 | Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, | |||
3348 | BitWidth, InitStyle, AS); | |||
3349 | if (!Member) | |||
3350 | return nullptr; | |||
3351 | } | |||
3352 | ||||
3353 | CheckShadowInheritedFields(Loc, Name, cast<CXXRecordDecl>(CurContext)); | |||
3354 | } else { | |||
3355 | Member = HandleDeclarator(S, D, TemplateParameterLists); | |||
3356 | if (!Member) | |||
3357 | return nullptr; | |||
3358 | ||||
3359 | // Non-instance-fields can't have a bitfield. | |||
3360 | if (BitWidth) { | |||
3361 | if (Member->isInvalidDecl()) { | |||
3362 | // don't emit another diagnostic. | |||
3363 | } else if (isa<VarDecl>(Member) || isa<VarTemplateDecl>(Member)) { | |||
3364 | // C++ 9.6p3: A bit-field shall not be a static member. | |||
3365 | // "static member 'A' cannot be a bit-field" | |||
3366 | Diag(Loc, diag::err_static_not_bitfield) | |||
3367 | << Name << BitWidth->getSourceRange(); | |||
3368 | } else if (isa<TypedefDecl>(Member)) { | |||
3369 | // "typedef member 'x' cannot be a bit-field" | |||
3370 | Diag(Loc, diag::err_typedef_not_bitfield) | |||
3371 | << Name << BitWidth->getSourceRange(); | |||
3372 | } else { | |||
3373 | // A function typedef ("typedef int f(); f a;"). | |||
3374 | // C++ 9.6p3: A bit-field shall have integral or enumeration type. | |||
3375 | Diag(Loc, diag::err_not_integral_type_bitfield) | |||
3376 | << Name << cast<ValueDecl>(Member)->getType() | |||
3377 | << BitWidth->getSourceRange(); | |||
3378 | } | |||
3379 | ||||
3380 | BitWidth = nullptr; | |||
3381 | Member->setInvalidDecl(); | |||
3382 | } | |||
3383 | ||||
3384 | NamedDecl *NonTemplateMember = Member; | |||
3385 | if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) | |||
3386 | NonTemplateMember = FunTmpl->getTemplatedDecl(); | |||
3387 | else if (VarTemplateDecl *VarTmpl = dyn_cast<VarTemplateDecl>(Member)) | |||
3388 | NonTemplateMember = VarTmpl->getTemplatedDecl(); | |||
3389 | ||||
3390 | Member->setAccess(AS); | |||
3391 | ||||
3392 | // If we have declared a member function template or static data member | |||
3393 | // template, set the access of the templated declaration as well. | |||
3394 | if (NonTemplateMember != Member) | |||
3395 | NonTemplateMember->setAccess(AS); | |||
3396 | ||||
3397 | // C++ [temp.deduct.guide]p3: | |||
3398 | // A deduction guide [...] for a member class template [shall be | |||
3399 | // declared] with the same access [as the template]. | |||
3400 | if (auto *DG = dyn_cast<CXXDeductionGuideDecl>(NonTemplateMember)) { | |||
3401 | auto *TD = DG->getDeducedTemplate(); | |||
3402 | // Access specifiers are only meaningful if both the template and the | |||
3403 | // deduction guide are from the same scope. | |||
3404 | if (AS != TD->getAccess() && | |||
3405 | TD->getDeclContext()->getRedeclContext()->Equals( | |||
3406 | DG->getDeclContext()->getRedeclContext())) { | |||
3407 | Diag(DG->getBeginLoc(), diag::err_deduction_guide_wrong_access); | |||
3408 | Diag(TD->getBeginLoc(), diag::note_deduction_guide_template_access) | |||
3409 | << TD->getAccess(); | |||
3410 | const AccessSpecDecl *LastAccessSpec = nullptr; | |||
3411 | for (const auto *D : cast<CXXRecordDecl>(CurContext)->decls()) { | |||
3412 | if (const auto *AccessSpec = dyn_cast<AccessSpecDecl>(D)) | |||
3413 | LastAccessSpec = AccessSpec; | |||
3414 | } | |||
3415 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 3415, __PRETTY_FUNCTION__)); | |||
3416 | Diag(LastAccessSpec->getBeginLoc(), diag::note_deduction_guide_access) | |||
3417 | << AS; | |||
3418 | } | |||
3419 | } | |||
3420 | } | |||
3421 | ||||
3422 | if (VS.isOverrideSpecified()) | |||
3423 | Member->addAttr(OverrideAttr::Create(Context, VS.getOverrideLoc(), | |||
3424 | AttributeCommonInfo::AS_Keyword)); | |||
3425 | if (VS.isFinalSpecified()) | |||
3426 | Member->addAttr(FinalAttr::Create( | |||
3427 | Context, VS.getFinalLoc(), AttributeCommonInfo::AS_Keyword, | |||
3428 | static_cast<FinalAttr::Spelling>(VS.isFinalSpelledSealed()))); | |||
3429 | ||||
3430 | if (VS.getLastLocation().isValid()) { | |||
3431 | // Update the end location of a method that has a virt-specifiers. | |||
3432 | if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) | |||
3433 | MD->setRangeEnd(VS.getLastLocation()); | |||
3434 | } | |||
3435 | ||||
3436 | CheckOverrideControl(Member); | |||
3437 | ||||
3438 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 3438, __PRETTY_FUNCTION__)); | |||
3439 | ||||
3440 | if (isInstField) { | |||
3441 | FieldDecl *FD = cast<FieldDecl>(Member); | |||
3442 | FieldCollector->Add(FD); | |||
3443 | ||||
3444 | if (!Diags.isIgnored(diag::warn_unused_private_field, FD->getLocation())) { | |||
3445 | // Remember all explicit private FieldDecls that have a name, no side | |||
3446 | // effects and are not part of a dependent type declaration. | |||
3447 | if (!FD->isImplicit() && FD->getDeclName() && | |||
3448 | FD->getAccess() == AS_private && | |||
3449 | !FD->hasAttr<UnusedAttr>() && | |||
3450 | !FD->getParent()->isDependentContext() && | |||
3451 | !InitializationHasSideEffects(*FD)) | |||
3452 | UnusedPrivateFields.insert(FD); | |||
3453 | } | |||
3454 | } | |||
3455 | ||||
3456 | return Member; | |||
3457 | } | |||
3458 | ||||
3459 | namespace { | |||
3460 | class UninitializedFieldVisitor | |||
3461 | : public EvaluatedExprVisitor<UninitializedFieldVisitor> { | |||
3462 | Sema &S; | |||
3463 | // List of Decls to generate a warning on. Also remove Decls that become | |||
3464 | // initialized. | |||
3465 | llvm::SmallPtrSetImpl<ValueDecl*> &Decls; | |||
3466 | // List of base classes of the record. Classes are removed after their | |||
3467 | // initializers. | |||
3468 | llvm::SmallPtrSetImpl<QualType> &BaseClasses; | |||
3469 | // Vector of decls to be removed from the Decl set prior to visiting the | |||
3470 | // nodes. These Decls may have been initialized in the prior initializer. | |||
3471 | llvm::SmallVector<ValueDecl*, 4> DeclsToRemove; | |||
3472 | // If non-null, add a note to the warning pointing back to the constructor. | |||
3473 | const CXXConstructorDecl *Constructor; | |||
3474 | // Variables to hold state when processing an initializer list. When | |||
3475 | // InitList is true, special case initialization of FieldDecls matching | |||
3476 | // InitListFieldDecl. | |||
3477 | bool InitList; | |||
3478 | FieldDecl *InitListFieldDecl; | |||
3479 | llvm::SmallVector<unsigned, 4> InitFieldIndex; | |||
3480 | ||||
3481 | public: | |||
3482 | typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; | |||
3483 | UninitializedFieldVisitor(Sema &S, | |||
3484 | llvm::SmallPtrSetImpl<ValueDecl*> &Decls, | |||
3485 | llvm::SmallPtrSetImpl<QualType> &BaseClasses) | |||
3486 | : Inherited(S.Context), S(S), Decls(Decls), BaseClasses(BaseClasses), | |||
3487 | Constructor(nullptr), InitList(false), InitListFieldDecl(nullptr) {} | |||
3488 | ||||
3489 | // Returns true if the use of ME is not an uninitialized use. | |||
3490 | bool IsInitListMemberExprInitialized(MemberExpr *ME, | |||
3491 | bool CheckReferenceOnly) { | |||
3492 | llvm::SmallVector<FieldDecl*, 4> Fields; | |||
3493 | bool ReferenceField = false; | |||
3494 | while (ME) { | |||
3495 | FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl()); | |||
3496 | if (!FD) | |||
3497 | return false; | |||
3498 | Fields.push_back(FD); | |||
3499 | if (FD->getType()->isReferenceType()) | |||
3500 | ReferenceField = true; | |||
3501 | ME = dyn_cast<MemberExpr>(ME->getBase()->IgnoreParenImpCasts()); | |||
3502 | } | |||
3503 | ||||
3504 | // Binding a reference to an uninitialized field is not an | |||
3505 | // uninitialized use. | |||
3506 | if (CheckReferenceOnly && !ReferenceField) | |||
3507 | return true; | |||
3508 | ||||
3509 | llvm::SmallVector<unsigned, 4> UsedFieldIndex; | |||
3510 | // Discard the first field since it is the field decl that is being | |||
3511 | // initialized. | |||
3512 | for (auto I = Fields.rbegin() + 1, E = Fields.rend(); I != E; ++I) { | |||
3513 | UsedFieldIndex.push_back((*I)->getFieldIndex()); | |||
3514 | } | |||
3515 | ||||
3516 | for (auto UsedIter = UsedFieldIndex.begin(), | |||
3517 | UsedEnd = UsedFieldIndex.end(), | |||
3518 | OrigIter = InitFieldIndex.begin(), | |||
3519 | OrigEnd = InitFieldIndex.end(); | |||
3520 | UsedIter != UsedEnd && OrigIter != OrigEnd; ++UsedIter, ++OrigIter) { | |||
3521 | if (*UsedIter < *OrigIter) | |||
3522 | return true; | |||
3523 | if (*UsedIter > *OrigIter) | |||
3524 | break; | |||
3525 | } | |||
3526 | ||||
3527 | return false; | |||
3528 | } | |||
3529 | ||||
3530 | void HandleMemberExpr(MemberExpr *ME, bool CheckReferenceOnly, | |||
3531 | bool AddressOf) { | |||
3532 | if (isa<EnumConstantDecl>(ME->getMemberDecl())) | |||
3533 | return; | |||
3534 | ||||
3535 | // FieldME is the inner-most MemberExpr that is not an anonymous struct | |||
3536 | // or union. | |||
3537 | MemberExpr *FieldME = ME; | |||
3538 | ||||
3539 | bool AllPODFields = FieldME->getType().isPODType(S.Context); | |||
3540 | ||||
3541 | Expr *Base = ME; | |||
3542 | while (MemberExpr *SubME = | |||
3543 | dyn_cast<MemberExpr>(Base->IgnoreParenImpCasts())) { | |||
3544 | ||||
3545 | if (isa<VarDecl>(SubME->getMemberDecl())) | |||
3546 | return; | |||
3547 | ||||
3548 | if (FieldDecl *FD = dyn_cast<FieldDecl>(SubME->getMemberDecl())) | |||
3549 | if (!FD->isAnonymousStructOrUnion()) | |||
3550 | FieldME = SubME; | |||
3551 | ||||
3552 | if (!FieldME->getType().isPODType(S.Context)) | |||
3553 | AllPODFields = false; | |||
3554 | ||||
3555 | Base = SubME->getBase(); | |||
3556 | } | |||
3557 | ||||
3558 | if (!isa<CXXThisExpr>(Base->IgnoreParenImpCasts())) | |||
3559 | return; | |||
3560 | ||||
3561 | if (AddressOf && AllPODFields) | |||
3562 | return; | |||
3563 | ||||
3564 | ValueDecl* FoundVD = FieldME->getMemberDecl(); | |||
3565 | ||||
3566 | if (ImplicitCastExpr *BaseCast = dyn_cast<ImplicitCastExpr>(Base)) { | |||
3567 | while (isa<ImplicitCastExpr>(BaseCast->getSubExpr())) { | |||
3568 | BaseCast = cast<ImplicitCastExpr>(BaseCast->getSubExpr()); | |||
3569 | } | |||
3570 | ||||
3571 | if (BaseCast->getCastKind() == CK_UncheckedDerivedToBase) { | |||
3572 | QualType T = BaseCast->getType(); | |||
3573 | if (T->isPointerType() && | |||
3574 | BaseClasses.count(T->getPointeeType())) { | |||
3575 | S.Diag(FieldME->getExprLoc(), diag::warn_base_class_is_uninit) | |||
3576 | << T->getPointeeType() << FoundVD; | |||
3577 | } | |||
3578 | } | |||
3579 | } | |||
3580 | ||||
3581 | if (!Decls.count(FoundVD)) | |||
3582 | return; | |||
3583 | ||||
3584 | const bool IsReference = FoundVD->getType()->isReferenceType(); | |||
3585 | ||||
3586 | if (InitList && !AddressOf && FoundVD == InitListFieldDecl) { | |||
3587 | // Special checking for initializer lists. | |||
3588 | if (IsInitListMemberExprInitialized(ME, CheckReferenceOnly)) { | |||
3589 | return; | |||
3590 | } | |||
3591 | } else { | |||
3592 | // Prevent double warnings on use of unbounded references. | |||
3593 | if (CheckReferenceOnly && !IsReference) | |||
3594 | return; | |||
3595 | } | |||
3596 | ||||
3597 | unsigned diag = IsReference | |||
3598 | ? diag::warn_reference_field_is_uninit | |||
3599 | : diag::warn_field_is_uninit; | |||
3600 | S.Diag(FieldME->getExprLoc(), diag) << FoundVD; | |||
3601 | if (Constructor) | |||
3602 | S.Diag(Constructor->getLocation(), | |||
3603 | diag::note_uninit_in_this_constructor) | |||
3604 | << (Constructor->isDefaultConstructor() && Constructor->isImplicit()); | |||
3605 | ||||
3606 | } | |||
3607 | ||||
3608 | void HandleValue(Expr *E, bool AddressOf) { | |||
3609 | E = E->IgnoreParens(); | |||
3610 | ||||
3611 | if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { | |||
3612 | HandleMemberExpr(ME, false /*CheckReferenceOnly*/, | |||
3613 | AddressOf /*AddressOf*/); | |||
3614 | return; | |||
3615 | } | |||
3616 | ||||
3617 | if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { | |||
3618 | Visit(CO->getCond()); | |||
3619 | HandleValue(CO->getTrueExpr(), AddressOf); | |||
3620 | HandleValue(CO->getFalseExpr(), AddressOf); | |||
3621 | return; | |||
3622 | } | |||
3623 | ||||
3624 | if (BinaryConditionalOperator *BCO = | |||
3625 | dyn_cast<BinaryConditionalOperator>(E)) { | |||
3626 | Visit(BCO->getCond()); | |||
3627 | HandleValue(BCO->getFalseExpr(), AddressOf); | |||
3628 | return; | |||
3629 | } | |||
3630 | ||||
3631 | if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) { | |||
3632 | HandleValue(OVE->getSourceExpr(), AddressOf); | |||
3633 | return; | |||
3634 | } | |||
3635 | ||||
3636 | if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { | |||
3637 | switch (BO->getOpcode()) { | |||
3638 | default: | |||
3639 | break; | |||
3640 | case(BO_PtrMemD): | |||
3641 | case(BO_PtrMemI): | |||
3642 | HandleValue(BO->getLHS(), AddressOf); | |||
3643 | Visit(BO->getRHS()); | |||
3644 | return; | |||
3645 | case(BO_Comma): | |||
3646 | Visit(BO->getLHS()); | |||
3647 | HandleValue(BO->getRHS(), AddressOf); | |||
3648 | return; | |||
3649 | } | |||
3650 | } | |||
3651 | ||||
3652 | Visit(E); | |||
3653 | } | |||
3654 | ||||
3655 | void CheckInitListExpr(InitListExpr *ILE) { | |||
3656 | InitFieldIndex.push_back(0); | |||
3657 | for (auto Child : ILE->children()) { | |||
3658 | if (InitListExpr *SubList = dyn_cast<InitListExpr>(Child)) { | |||
3659 | CheckInitListExpr(SubList); | |||
3660 | } else { | |||
3661 | Visit(Child); | |||
3662 | } | |||
3663 | ++InitFieldIndex.back(); | |||
3664 | } | |||
3665 | InitFieldIndex.pop_back(); | |||
3666 | } | |||
3667 | ||||
3668 | void CheckInitializer(Expr *E, const CXXConstructorDecl *FieldConstructor, | |||
3669 | FieldDecl *Field, const Type *BaseClass) { | |||
3670 | // Remove Decls that may have been initialized in the previous | |||
3671 | // initializer. | |||
3672 | for (ValueDecl* VD : DeclsToRemove) | |||
3673 | Decls.erase(VD); | |||
3674 | DeclsToRemove.clear(); | |||
3675 | ||||
3676 | Constructor = FieldConstructor; | |||
3677 | InitListExpr *ILE = dyn_cast<InitListExpr>(E); | |||
3678 | ||||
3679 | if (ILE && Field) { | |||
3680 | InitList = true; | |||
3681 | InitListFieldDecl = Field; | |||
3682 | InitFieldIndex.clear(); | |||
3683 | CheckInitListExpr(ILE); | |||
3684 | } else { | |||
3685 | InitList = false; | |||
3686 | Visit(E); | |||
3687 | } | |||
3688 | ||||
3689 | if (Field) | |||
3690 | Decls.erase(Field); | |||
3691 | if (BaseClass) | |||
3692 | BaseClasses.erase(BaseClass->getCanonicalTypeInternal()); | |||
3693 | } | |||
3694 | ||||
3695 | void VisitMemberExpr(MemberExpr *ME) { | |||
3696 | // All uses of unbounded reference fields will warn. | |||
3697 | HandleMemberExpr(ME, true /*CheckReferenceOnly*/, false /*AddressOf*/); | |||
3698 | } | |||
3699 | ||||
3700 | void VisitImplicitCastExpr(ImplicitCastExpr *E) { | |||
3701 | if (E->getCastKind() == CK_LValueToRValue) { | |||
3702 | HandleValue(E->getSubExpr(), false /*AddressOf*/); | |||
3703 | return; | |||
3704 | } | |||
3705 | ||||
3706 | Inherited::VisitImplicitCastExpr(E); | |||
3707 | } | |||
3708 | ||||
3709 | void VisitCXXConstructExpr(CXXConstructExpr *E) { | |||
3710 | if (E->getConstructor()->isCopyConstructor()) { | |||
3711 | Expr *ArgExpr = E->getArg(0); | |||
3712 | if (InitListExpr *ILE = dyn_cast<InitListExpr>(ArgExpr)) | |||
3713 | if (ILE->getNumInits() == 1) | |||
3714 | ArgExpr = ILE->getInit(0); | |||
3715 | if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr)) | |||
3716 | if (ICE->getCastKind() == CK_NoOp) | |||
3717 | ArgExpr = ICE->getSubExpr(); | |||
3718 | HandleValue(ArgExpr, false /*AddressOf*/); | |||
3719 | return; | |||
3720 | } | |||
3721 | Inherited::VisitCXXConstructExpr(E); | |||
3722 | } | |||
3723 | ||||
3724 | void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { | |||
3725 | Expr *Callee = E->getCallee(); | |||
3726 | if (isa<MemberExpr>(Callee)) { | |||
3727 | HandleValue(Callee, false /*AddressOf*/); | |||
3728 | for (auto Arg : E->arguments()) | |||
3729 | Visit(Arg); | |||
3730 | return; | |||
3731 | } | |||
3732 | ||||
3733 | Inherited::VisitCXXMemberCallExpr(E); | |||
3734 | } | |||
3735 | ||||
3736 | void VisitCallExpr(CallExpr *E) { | |||
3737 | // Treat std::move as a use. | |||
3738 | if (E->isCallToStdMove()) { | |||
3739 | HandleValue(E->getArg(0), /*AddressOf=*/false); | |||
3740 | return; | |||
3741 | } | |||
3742 | ||||
3743 | Inherited::VisitCallExpr(E); | |||
3744 | } | |||
3745 | ||||
3746 | void VisitCXXOperatorCallExpr(CXXOperatorCallExpr *E) { | |||
3747 | Expr *Callee = E->getCallee(); | |||
3748 | ||||
3749 | if (isa<UnresolvedLookupExpr>(Callee)) | |||
3750 | return Inherited::VisitCXXOperatorCallExpr(E); | |||
3751 | ||||
3752 | Visit(Callee); | |||
3753 | for (auto Arg : E->arguments()) | |||
3754 | HandleValue(Arg->IgnoreParenImpCasts(), false /*AddressOf*/); | |||
3755 | } | |||
3756 | ||||
3757 | void VisitBinaryOperator(BinaryOperator *E) { | |||
3758 | // If a field assignment is detected, remove the field from the | |||
3759 | // uninitiailized field set. | |||
3760 | if (E->getOpcode() == BO_Assign) | |||
3761 | if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getLHS())) | |||
3762 | if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) | |||
3763 | if (!FD->getType()->isReferenceType()) | |||
3764 | DeclsToRemove.push_back(FD); | |||
3765 | ||||
3766 | if (E->isCompoundAssignmentOp()) { | |||
3767 | HandleValue(E->getLHS(), false /*AddressOf*/); | |||
3768 | Visit(E->getRHS()); | |||
3769 | return; | |||
3770 | } | |||
3771 | ||||
3772 | Inherited::VisitBinaryOperator(E); | |||
3773 | } | |||
3774 | ||||
3775 | void VisitUnaryOperator(UnaryOperator *E) { | |||
3776 | if (E->isIncrementDecrementOp()) { | |||
3777 | HandleValue(E->getSubExpr(), false /*AddressOf*/); | |||
3778 | return; | |||
3779 | } | |||
3780 | if (E->getOpcode() == UO_AddrOf) { | |||
3781 | if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getSubExpr())) { | |||
3782 | HandleValue(ME->getBase(), true /*AddressOf*/); | |||
3783 | return; | |||
3784 | } | |||
3785 | } | |||
3786 | ||||
3787 | Inherited::VisitUnaryOperator(E); | |||
3788 | } | |||
3789 | }; | |||
3790 | ||||
3791 | // Diagnose value-uses of fields to initialize themselves, e.g. | |||
3792 | // foo(foo) | |||
3793 | // where foo is not also a parameter to the constructor. | |||
3794 | // Also diagnose across field uninitialized use such as | |||
3795 | // x(y), y(x) | |||
3796 | // TODO: implement -Wuninitialized and fold this into that framework. | |||
3797 | static void DiagnoseUninitializedFields( | |||
3798 | Sema &SemaRef, const CXXConstructorDecl *Constructor) { | |||
3799 | ||||
3800 | if (SemaRef.getDiagnostics().isIgnored(diag::warn_field_is_uninit, | |||
3801 | Constructor->getLocation())) { | |||
3802 | return; | |||
3803 | } | |||
3804 | ||||
3805 | if (Constructor->isInvalidDecl()) | |||
3806 | return; | |||
3807 | ||||
3808 | const CXXRecordDecl *RD = Constructor->getParent(); | |||
3809 | ||||
3810 | if (RD->isDependentContext()) | |||
3811 | return; | |||
3812 | ||||
3813 | // Holds fields that are uninitialized. | |||
3814 | llvm::SmallPtrSet<ValueDecl*, 4> UninitializedFields; | |||
3815 | ||||
3816 | // At the beginning, all fields are uninitialized. | |||
3817 | for (auto *I : RD->decls()) { | |||
3818 | if (auto *FD = dyn_cast<FieldDecl>(I)) { | |||
3819 | UninitializedFields.insert(FD); | |||
3820 | } else if (auto *IFD = dyn_cast<IndirectFieldDecl>(I)) { | |||
3821 | UninitializedFields.insert(IFD->getAnonField()); | |||
3822 | } | |||
3823 | } | |||
3824 | ||||
3825 | llvm::SmallPtrSet<QualType, 4> UninitializedBaseClasses; | |||
3826 | for (auto I : RD->bases()) | |||
3827 | UninitializedBaseClasses.insert(I.getType().getCanonicalType()); | |||
3828 | ||||
3829 | if (UninitializedFields.empty() && UninitializedBaseClasses.empty()) | |||
3830 | return; | |||
3831 | ||||
3832 | UninitializedFieldVisitor UninitializedChecker(SemaRef, | |||
3833 | UninitializedFields, | |||
3834 | UninitializedBaseClasses); | |||
3835 | ||||
3836 | for (const auto *FieldInit : Constructor->inits()) { | |||
3837 | if (UninitializedFields.empty() && UninitializedBaseClasses.empty()) | |||
3838 | break; | |||
3839 | ||||
3840 | Expr *InitExpr = FieldInit->getInit(); | |||
3841 | if (!InitExpr) | |||
3842 | continue; | |||
3843 | ||||
3844 | if (CXXDefaultInitExpr *Default = | |||
3845 | dyn_cast<CXXDefaultInitExpr>(InitExpr)) { | |||
3846 | InitExpr = Default->getExpr(); | |||
3847 | if (!InitExpr) | |||
3848 | continue; | |||
3849 | // In class initializers will point to the constructor. | |||
3850 | UninitializedChecker.CheckInitializer(InitExpr, Constructor, | |||
3851 | FieldInit->getAnyMember(), | |||
3852 | FieldInit->getBaseClass()); | |||
3853 | } else { | |||
3854 | UninitializedChecker.CheckInitializer(InitExpr, nullptr, | |||
3855 | FieldInit->getAnyMember(), | |||
3856 | FieldInit->getBaseClass()); | |||
3857 | } | |||
3858 | } | |||
3859 | } | |||
3860 | } // namespace | |||
3861 | ||||
3862 | /// Enter a new C++ default initializer scope. After calling this, the | |||
3863 | /// caller must call \ref ActOnFinishCXXInClassMemberInitializer, even if | |||
3864 | /// parsing or instantiating the initializer failed. | |||
3865 | void Sema::ActOnStartCXXInClassMemberInitializer() { | |||
3866 | // Create a synthetic function scope to represent the call to the constructor | |||
3867 | // that notionally surrounds a use of this initializer. | |||
3868 | PushFunctionScope(); | |||
3869 | } | |||
3870 | ||||
3871 | void Sema::ActOnStartTrailingRequiresClause(Scope *S, Declarator &D) { | |||
3872 | if (!D.isFunctionDeclarator()) | |||
3873 | return; | |||
3874 | auto &FTI = D.getFunctionTypeInfo(); | |||
3875 | if (!FTI.Params) | |||
3876 | return; | |||
3877 | for (auto &Param : ArrayRef<DeclaratorChunk::ParamInfo>(FTI.Params, | |||
3878 | FTI.NumParams)) { | |||
3879 | auto *ParamDecl = cast<NamedDecl>(Param.Param); | |||
3880 | if (ParamDecl->getDeclName()) | |||
3881 | PushOnScopeChains(ParamDecl, S, /*AddToContext=*/false); | |||
3882 | } | |||
3883 | } | |||
3884 | ||||
3885 | ExprResult Sema::ActOnFinishTrailingRequiresClause(ExprResult ConstraintExpr) { | |||
3886 | if (ConstraintExpr.isInvalid()) | |||
3887 | return ExprError(); | |||
3888 | return CorrectDelayedTyposInExpr(ConstraintExpr); | |||
3889 | } | |||
3890 | ||||
3891 | /// This is invoked after parsing an in-class initializer for a | |||
3892 | /// non-static C++ class member, and after instantiating an in-class initializer | |||
3893 | /// in a class template. Such actions are deferred until the class is complete. | |||
3894 | void Sema::ActOnFinishCXXInClassMemberInitializer(Decl *D, | |||
3895 | SourceLocation InitLoc, | |||
3896 | Expr *InitExpr) { | |||
3897 | // Pop the notional constructor scope we created earlier. | |||
3898 | PopFunctionScopeInfo(nullptr, D); | |||
3899 | ||||
3900 | FieldDecl *FD = dyn_cast<FieldDecl>(D); | |||
3901 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 3902, __PRETTY_FUNCTION__)) | |||
3902 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 3902, __PRETTY_FUNCTION__)); | |||
3903 | ||||
3904 | if (!InitExpr) { | |||
3905 | D->setInvalidDecl(); | |||
3906 | if (FD) | |||
3907 | FD->removeInClassInitializer(); | |||
3908 | return; | |||
3909 | } | |||
3910 | ||||
3911 | if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { | |||
3912 | FD->setInvalidDecl(); | |||
3913 | FD->removeInClassInitializer(); | |||
3914 | return; | |||
3915 | } | |||
3916 | ||||
3917 | ExprResult Init = InitExpr; | |||
3918 | if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { | |||
3919 | InitializedEntity Entity = | |||
3920 | InitializedEntity::InitializeMemberFromDefaultMemberInitializer(FD); | |||
3921 | InitializationKind Kind = | |||
3922 | FD->getInClassInitStyle() == ICIS_ListInit | |||
3923 | ? InitializationKind::CreateDirectList(InitExpr->getBeginLoc(), | |||
3924 | InitExpr->getBeginLoc(), | |||
3925 | InitExpr->getEndLoc()) | |||
3926 | : InitializationKind::CreateCopy(InitExpr->getBeginLoc(), InitLoc); | |||
3927 | InitializationSequence Seq(*this, Entity, Kind, InitExpr); | |||
3928 | Init = Seq.Perform(*this, Entity, Kind, InitExpr); | |||
3929 | if (Init.isInvalid()) { | |||
3930 | FD->setInvalidDecl(); | |||
3931 | return; | |||
3932 | } | |||
3933 | } | |||
3934 | ||||
3935 | // C++11 [class.base.init]p7: | |||
3936 | // The initialization of each base and member constitutes a | |||
3937 | // full-expression. | |||
3938 | Init = ActOnFinishFullExpr(Init.get(), InitLoc, /*DiscardedValue*/ false); | |||
3939 | if (Init.isInvalid()) { | |||
3940 | FD->setInvalidDecl(); | |||
3941 | return; | |||
3942 | } | |||
3943 | ||||
3944 | InitExpr = Init.get(); | |||
3945 | ||||
3946 | FD->setInClassInitializer(InitExpr); | |||
3947 | } | |||
3948 | ||||
3949 | /// Find the direct and/or virtual base specifiers that | |||
3950 | /// correspond to the given base type, for use in base initialization | |||
3951 | /// within a constructor. | |||
3952 | static bool FindBaseInitializer(Sema &SemaRef, | |||
3953 | CXXRecordDecl *ClassDecl, | |||
3954 | QualType BaseType, | |||
3955 | const CXXBaseSpecifier *&DirectBaseSpec, | |||
3956 | const CXXBaseSpecifier *&VirtualBaseSpec) { | |||
3957 | // First, check for a direct base class. | |||
3958 | DirectBaseSpec = nullptr; | |||
3959 | for (const auto &Base : ClassDecl->bases()) { | |||
3960 | if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base.getType())) { | |||
3961 | // We found a direct base of this type. That's what we're | |||
3962 | // initializing. | |||
3963 | DirectBaseSpec = &Base; | |||
3964 | break; | |||
3965 | } | |||
3966 | } | |||
3967 | ||||
3968 | // Check for a virtual base class. | |||
3969 | // FIXME: We might be able to short-circuit this if we know in advance that | |||
3970 | // there are no virtual bases. | |||
3971 | VirtualBaseSpec = nullptr; | |||
3972 | if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { | |||
3973 | // We haven't found a base yet; search the class hierarchy for a | |||
3974 | // virtual base class. | |||
3975 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, | |||
3976 | /*DetectVirtual=*/false); | |||
3977 | if (SemaRef.IsDerivedFrom(ClassDecl->getLocation(), | |||
3978 | SemaRef.Context.getTypeDeclType(ClassDecl), | |||
3979 | BaseType, Paths)) { | |||
3980 | for (CXXBasePaths::paths_iterator Path = Paths.begin(); | |||
3981 | Path != Paths.end(); ++Path) { | |||
3982 | if (Path->back().Base->isVirtual()) { | |||
3983 | VirtualBaseSpec = Path->back().Base; | |||
3984 | break; | |||
3985 | } | |||
3986 | } | |||
3987 | } | |||
3988 | } | |||
3989 | ||||
3990 | return DirectBaseSpec || VirtualBaseSpec; | |||
3991 | } | |||
3992 | ||||
3993 | /// Handle a C++ member initializer using braced-init-list syntax. | |||
3994 | MemInitResult | |||
3995 | Sema::ActOnMemInitializer(Decl *ConstructorD, | |||
3996 | Scope *S, | |||
3997 | CXXScopeSpec &SS, | |||
3998 | IdentifierInfo *MemberOrBase, | |||
3999 | ParsedType TemplateTypeTy, | |||
4000 | const DeclSpec &DS, | |||
4001 | SourceLocation IdLoc, | |||
4002 | Expr *InitList, | |||
4003 | SourceLocation EllipsisLoc) { | |||
4004 | return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, | |||
4005 | DS, IdLoc, InitList, | |||
4006 | EllipsisLoc); | |||
4007 | } | |||
4008 | ||||
4009 | /// Handle a C++ member initializer using parentheses syntax. | |||
4010 | MemInitResult | |||
4011 | Sema::ActOnMemInitializer(Decl *ConstructorD, | |||
4012 | Scope *S, | |||
4013 | CXXScopeSpec &SS, | |||
4014 | IdentifierInfo *MemberOrBase, | |||
4015 | ParsedType TemplateTypeTy, | |||
4016 | const DeclSpec &DS, | |||
4017 | SourceLocation IdLoc, | |||
4018 | SourceLocation LParenLoc, | |||
4019 | ArrayRef<Expr *> Args, | |||
4020 | SourceLocation RParenLoc, | |||
4021 | SourceLocation EllipsisLoc) { | |||
4022 | Expr *List = ParenListExpr::Create(Context, LParenLoc, Args, RParenLoc); | |||
4023 | return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, | |||
4024 | DS, IdLoc, List, EllipsisLoc); | |||
4025 | } | |||
4026 | ||||
4027 | namespace { | |||
4028 | ||||
4029 | // Callback to only accept typo corrections that can be a valid C++ member | |||
4030 | // intializer: either a non-static field member or a base class. | |||
4031 | class MemInitializerValidatorCCC final : public CorrectionCandidateCallback { | |||
4032 | public: | |||
4033 | explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) | |||
4034 | : ClassDecl(ClassDecl) {} | |||
4035 | ||||
4036 | bool ValidateCandidate(const TypoCorrection &candidate) override { | |||
4037 | if (NamedDecl *ND = candidate.getCorrectionDecl()) { | |||
4038 | if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) | |||
4039 | return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); | |||
4040 | return isa<TypeDecl>(ND); | |||
4041 | } | |||
4042 | return false; | |||
4043 | } | |||
4044 | ||||
4045 | std::unique_ptr<CorrectionCandidateCallback> clone() override { | |||
4046 | return std::make_unique<MemInitializerValidatorCCC>(*this); | |||
4047 | } | |||
4048 | ||||
4049 | private: | |||
4050 | CXXRecordDecl *ClassDecl; | |||
4051 | }; | |||
4052 | ||||
4053 | } | |||
4054 | ||||
4055 | ValueDecl *Sema::tryLookupCtorInitMemberDecl(CXXRecordDecl *ClassDecl, | |||
4056 | CXXScopeSpec &SS, | |||
4057 | ParsedType TemplateTypeTy, | |||
4058 | IdentifierInfo *MemberOrBase) { | |||
4059 | if (SS.getScopeRep() || TemplateTypeTy) | |||
4060 | return nullptr; | |||
4061 | DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase); | |||
4062 | if (Result.empty()) | |||
4063 | return nullptr; | |||
4064 | ValueDecl *Member; | |||
4065 | if ((Member = dyn_cast<FieldDecl>(Result.front())) || | |||
4066 | (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) | |||
4067 | return Member; | |||
4068 | return nullptr; | |||
4069 | } | |||
4070 | ||||
4071 | /// Handle a C++ member initializer. | |||
4072 | MemInitResult | |||
4073 | Sema::BuildMemInitializer(Decl *ConstructorD, | |||
4074 | Scope *S, | |||
4075 | CXXScopeSpec &SS, | |||
4076 | IdentifierInfo *MemberOrBase, | |||
4077 | ParsedType TemplateTypeTy, | |||
4078 | const DeclSpec &DS, | |||
4079 | SourceLocation IdLoc, | |||
4080 | Expr *Init, | |||
4081 | SourceLocation EllipsisLoc) { | |||
4082 | ExprResult Res = CorrectDelayedTyposInExpr(Init); | |||
4083 | if (!Res.isUsable()) | |||
4084 | return true; | |||
4085 | Init = Res.get(); | |||
4086 | ||||
4087 | if (!ConstructorD) | |||
4088 | return true; | |||
4089 | ||||
4090 | AdjustDeclIfTemplate(ConstructorD); | |||
4091 | ||||
4092 | CXXConstructorDecl *Constructor | |||
4093 | = dyn_cast<CXXConstructorDecl>(ConstructorD); | |||
4094 | if (!Constructor) { | |||
4095 | // The user wrote a constructor initializer on a function that is | |||
4096 | // not a C++ constructor. Ignore the error for now, because we may | |||
4097 | // have more member initializers coming; we'll diagnose it just | |||
4098 | // once in ActOnMemInitializers. | |||
4099 | return true; | |||
4100 | } | |||
4101 | ||||
4102 | CXXRecordDecl *ClassDecl = Constructor->getParent(); | |||
4103 | ||||
4104 | // C++ [class.base.init]p2: | |||
4105 | // Names in a mem-initializer-id are looked up in the scope of the | |||
4106 | // constructor's class and, if not found in that scope, are looked | |||
4107 | // up in the scope containing the constructor's definition. | |||
4108 | // [Note: if the constructor's class contains a member with the | |||
4109 | // same name as a direct or virtual base class of the class, a | |||
4110 | // mem-initializer-id naming the member or base class and composed | |||
4111 | // of a single identifier refers to the class member. A | |||
4112 | // mem-initializer-id for the hidden base class may be specified | |||
4113 | // using a qualified name. ] | |||
4114 | ||||
4115 | // Look for a member, first. | |||
4116 | if (ValueDecl *Member = tryLookupCtorInitMemberDecl( | |||
4117 | ClassDecl, SS, TemplateTypeTy, MemberOrBase)) { | |||
4118 | if (EllipsisLoc.isValid()) | |||
4119 | Diag(EllipsisLoc, diag::err_pack_expansion_member_init) | |||
4120 | << MemberOrBase | |||
4121 | << SourceRange(IdLoc, Init->getSourceRange().getEnd()); | |||
4122 | ||||
4123 | return BuildMemberInitializer(Member, Init, IdLoc); | |||
4124 | } | |||
4125 | // It didn't name a member, so see if it names a class. | |||
4126 | QualType BaseType; | |||
4127 | TypeSourceInfo *TInfo = nullptr; | |||
4128 | ||||
4129 | if (TemplateTypeTy) { | |||
4130 | BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); | |||
4131 | if (BaseType.isNull()) | |||
4132 | return true; | |||
4133 | } else if (DS.getTypeSpecType() == TST_decltype) { | |||
4134 | BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); | |||
4135 | } else if (DS.getTypeSpecType() == TST_decltype_auto) { | |||
4136 | Diag(DS.getTypeSpecTypeLoc(), diag::err_decltype_auto_invalid); | |||
4137 | return true; | |||
4138 | } else { | |||
4139 | LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); | |||
4140 | LookupParsedName(R, S, &SS); | |||
4141 | ||||
4142 | TypeDecl *TyD = R.getAsSingle<TypeDecl>(); | |||
4143 | if (!TyD) { | |||
4144 | if (R.isAmbiguous()) return true; | |||
4145 | ||||
4146 | // We don't want access-control diagnostics here. | |||
4147 | R.suppressDiagnostics(); | |||
4148 | ||||
4149 | if (SS.isSet() && isDependentScopeSpecifier(SS)) { | |||
4150 | bool NotUnknownSpecialization = false; | |||
4151 | DeclContext *DC = computeDeclContext(SS, false); | |||
4152 | if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) | |||
4153 | NotUnknownSpecialization = !Record->hasAnyDependentBases(); | |||
4154 | ||||
4155 | if (!NotUnknownSpecialization) { | |||
4156 | // When the scope specifier can refer to a member of an unknown | |||
4157 | // specialization, we take it as a type name. | |||
4158 | BaseType = CheckTypenameType(ETK_None, SourceLocation(), | |||
4159 | SS.getWithLocInContext(Context), | |||
4160 | *MemberOrBase, IdLoc); | |||
4161 | if (BaseType.isNull()) | |||
4162 | return true; | |||
4163 | ||||
4164 | TInfo = Context.CreateTypeSourceInfo(BaseType); | |||
4165 | DependentNameTypeLoc TL = | |||
4166 | TInfo->getTypeLoc().castAs<DependentNameTypeLoc>(); | |||
4167 | if (!TL.isNull()) { | |||
4168 | TL.setNameLoc(IdLoc); | |||
4169 | TL.setElaboratedKeywordLoc(SourceLocation()); | |||
4170 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); | |||
4171 | } | |||
4172 | ||||
4173 | R.clear(); | |||
4174 | R.setLookupName(MemberOrBase); | |||
4175 | } | |||
4176 | } | |||
4177 | ||||
4178 | // If no results were found, try to correct typos. | |||
4179 | TypoCorrection Corr; | |||
4180 | MemInitializerValidatorCCC CCC(ClassDecl); | |||
4181 | if (R.empty() && BaseType.isNull() && | |||
4182 | (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, | |||
4183 | CCC, CTK_ErrorRecovery, ClassDecl))) { | |||
4184 | if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { | |||
4185 | // We have found a non-static data member with a similar | |||
4186 | // name to what was typed; complain and initialize that | |||
4187 | // member. | |||
4188 | diagnoseTypo(Corr, | |||
4189 | PDiag(diag::err_mem_init_not_member_or_class_suggest) | |||
4190 | << MemberOrBase << true); | |||
4191 | return BuildMemberInitializer(Member, Init, IdLoc); | |||
4192 | } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { | |||
4193 | const CXXBaseSpecifier *DirectBaseSpec; | |||
4194 | const CXXBaseSpecifier *VirtualBaseSpec; | |||
4195 | if (FindBaseInitializer(*this, ClassDecl, | |||
4196 | Context.getTypeDeclType(Type), | |||
4197 | DirectBaseSpec, VirtualBaseSpec)) { | |||
4198 | // We have found a direct or virtual base class with a | |||
4199 | // similar name to what was typed; complain and initialize | |||
4200 | // that base class. | |||
4201 | diagnoseTypo(Corr, | |||
4202 | PDiag(diag::err_mem_init_not_member_or_class_suggest) | |||
4203 | << MemberOrBase << false, | |||
4204 | PDiag() /*Suppress note, we provide our own.*/); | |||
4205 | ||||
4206 | const CXXBaseSpecifier *BaseSpec = DirectBaseSpec ? DirectBaseSpec | |||
4207 | : VirtualBaseSpec; | |||
4208 | Diag(BaseSpec->getBeginLoc(), diag::note_base_class_specified_here) | |||
4209 | << BaseSpec->getType() << BaseSpec->getSourceRange(); | |||
4210 | ||||
4211 | TyD = Type; | |||
4212 | } | |||
4213 | } | |||
4214 | } | |||
4215 | ||||
4216 | if (!TyD && BaseType.isNull()) { | |||
4217 | Diag(IdLoc, diag::err_mem_init_not_member_or_class) | |||
4218 | << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); | |||
4219 | return true; | |||
4220 | } | |||
4221 | } | |||
4222 | ||||
4223 | if (BaseType.isNull()) { | |||
4224 | BaseType = Context.getTypeDeclType(TyD); | |||
4225 | MarkAnyDeclReferenced(TyD->getLocation(), TyD, /*OdrUse=*/false); | |||
4226 | if (SS.isSet()) { | |||
4227 | BaseType = Context.getElaboratedType(ETK_None, SS.getScopeRep(), | |||
4228 | BaseType); | |||
4229 | TInfo = Context.CreateTypeSourceInfo(BaseType); | |||
4230 | ElaboratedTypeLoc TL = TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>(); | |||
4231 | TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(IdLoc); | |||
4232 | TL.setElaboratedKeywordLoc(SourceLocation()); | |||
4233 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); | |||
4234 | } | |||
4235 | } | |||
4236 | } | |||
4237 | ||||
4238 | if (!TInfo) | |||
4239 | TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); | |||
4240 | ||||
4241 | return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); | |||
4242 | } | |||
4243 | ||||
4244 | MemInitResult | |||
4245 | Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, | |||
4246 | SourceLocation IdLoc) { | |||
4247 | FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); | |||
4248 | IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); | |||
4249 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 4250, __PRETTY_FUNCTION__)) | |||
4250 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 4250, __PRETTY_FUNCTION__)); | |||
4251 | ||||
4252 | if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) | |||
4253 | return true; | |||
4254 | ||||
4255 | if (Member->isInvalidDecl()) | |||
4256 | return true; | |||
4257 | ||||
4258 | MultiExprArg Args; | |||
4259 | if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { | |||
4260 | Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); | |||
4261 | } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) { | |||
4262 | Args = MultiExprArg(InitList->getInits(), InitList->getNumInits()); | |||
4263 | } else { | |||
4264 | // Template instantiation doesn't reconstruct ParenListExprs for us. | |||
4265 | Args = Init; | |||
4266 | } | |||
4267 | ||||
4268 | SourceRange InitRange = Init->getSourceRange(); | |||
4269 | ||||
4270 | if (Member->getType()->isDependentType() || Init->isTypeDependent()) { | |||
4271 | // Can't check initialization for a member of dependent type or when | |||
4272 | // any of the arguments are type-dependent expressions. | |||
4273 | DiscardCleanupsInEvaluationContext(); | |||
4274 | } else { | |||
4275 | bool InitList = false; | |||
4276 | if (isa<InitListExpr>(Init)) { | |||
4277 | InitList = true; | |||
4278 | Args = Init; | |||
4279 | } | |||
4280 | ||||
4281 | // Initialize the member. | |||
4282 | InitializedEntity MemberEntity = | |||
4283 | DirectMember ? InitializedEntity::InitializeMember(DirectMember, nullptr) | |||
4284 | : InitializedEntity::InitializeMember(IndirectMember, | |||
4285 | nullptr); | |||
4286 | InitializationKind Kind = | |||
4287 | InitList ? InitializationKind::CreateDirectList( | |||
4288 | IdLoc, Init->getBeginLoc(), Init->getEndLoc()) | |||
4289 | : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), | |||
4290 | InitRange.getEnd()); | |||
4291 | ||||
4292 | InitializationSequence InitSeq(*this, MemberEntity, Kind, Args); | |||
4293 | ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, Args, | |||
4294 | nullptr); | |||
4295 | if (MemberInit.isInvalid()) | |||
4296 | return true; | |||
4297 | ||||
4298 | // C++11 [class.base.init]p7: | |||
4299 | // The initialization of each base and member constitutes a | |||
4300 | // full-expression. | |||
4301 | MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin(), | |||
4302 | /*DiscardedValue*/ false); | |||
4303 | if (MemberInit.isInvalid()) | |||
4304 | return true; | |||
4305 | ||||
4306 | Init = MemberInit.get(); | |||
4307 | } | |||
4308 | ||||
4309 | if (DirectMember) { | |||
4310 | return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, | |||
4311 | InitRange.getBegin(), Init, | |||
4312 | InitRange.getEnd()); | |||
4313 | } else { | |||
4314 | return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, | |||
4315 | InitRange.getBegin(), Init, | |||
4316 | InitRange.getEnd()); | |||
4317 | } | |||
4318 | } | |||
4319 | ||||
4320 | MemInitResult | |||
4321 | Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, | |||
4322 | CXXRecordDecl *ClassDecl) { | |||
4323 | SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); | |||
4324 | if (!LangOpts.CPlusPlus11) | |||
4325 | return Diag(NameLoc, diag::err_delegating_ctor) | |||
4326 | << TInfo->getTypeLoc().getLocalSourceRange(); | |||
4327 | Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); | |||
4328 | ||||
4329 | bool InitList = true; | |||
4330 | MultiExprArg Args = Init; | |||
4331 | if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { | |||
4332 | InitList = false; | |||
4333 | Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); | |||
4334 | } | |||
4335 | ||||
4336 | SourceRange InitRange = Init->getSourceRange(); | |||
4337 | // Initialize the object. | |||
4338 | InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( | |||
4339 | QualType(ClassDecl->getTypeForDecl(), 0)); | |||
4340 | InitializationKind Kind = | |||
4341 | InitList ? InitializationKind::CreateDirectList( | |||
4342 | NameLoc, Init->getBeginLoc(), Init->getEndLoc()) | |||
4343 | : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), | |||
4344 | InitRange.getEnd()); | |||
4345 | InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args); | |||
4346 | ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, | |||
4347 | Args, nullptr); | |||
4348 | if (DelegationInit.isInvalid()) | |||
4349 | return true; | |||
4350 | ||||
4351 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 4352, __PRETTY_FUNCTION__)) | |||
4352 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 4352, __PRETTY_FUNCTION__)); | |||
4353 | ||||
4354 | // C++11 [class.base.init]p7: | |||
4355 | // The initialization of each base and member constitutes a | |||
4356 | // full-expression. | |||
4357 | DelegationInit = ActOnFinishFullExpr( | |||
4358 | DelegationInit.get(), InitRange.getBegin(), /*DiscardedValue*/ false); | |||
4359 | if (DelegationInit.isInvalid()) | |||
4360 | return true; | |||
4361 | ||||
4362 | // If we are in a dependent context, template instantiation will | |||
4363 | // perform this type-checking again. Just save the arguments that we | |||
4364 | // received in a ParenListExpr. | |||
4365 | // FIXME: This isn't quite ideal, since our ASTs don't capture all | |||
4366 | // of the information that we have about the base | |||
4367 | // initializer. However, deconstructing the ASTs is a dicey process, | |||
4368 | // and this approach is far more likely to get the corner cases right. | |||
4369 | if (CurContext->isDependentContext()) | |||
4370 | DelegationInit = Init; | |||
4371 | ||||
4372 | return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), | |||
4373 | DelegationInit.getAs<Expr>(), | |||
4374 | InitRange.getEnd()); | |||
4375 | } | |||
4376 | ||||
4377 | MemInitResult | |||
4378 | Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, | |||
4379 | Expr *Init, CXXRecordDecl *ClassDecl, | |||
4380 | SourceLocation EllipsisLoc) { | |||
4381 | SourceLocation BaseLoc | |||
4382 | = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); | |||
4383 | ||||
4384 | if (!BaseType->isDependentType() && !BaseType->isRecordType()) | |||
4385 | return Diag(BaseLoc, diag::err_base_init_does_not_name_class) | |||
4386 | << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); | |||
4387 | ||||
4388 | // C++ [class.base.init]p2: | |||
4389 | // [...] Unless the mem-initializer-id names a nonstatic data | |||
4390 | // member of the constructor's class or a direct or virtual base | |||
4391 | // of that class, the mem-initializer is ill-formed. A | |||
4392 | // mem-initializer-list can initialize a base class using any | |||
4393 | // name that denotes that base class type. | |||
4394 | bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); | |||
4395 | ||||
4396 | SourceRange InitRange = Init->getSourceRange(); | |||
4397 | if (EllipsisLoc.isValid()) { | |||
4398 | // This is a pack expansion. | |||
4399 | if (!BaseType->containsUnexpandedParameterPack()) { | |||
4400 | Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) | |||
4401 | << SourceRange(BaseLoc, InitRange.getEnd()); | |||
4402 | ||||
4403 | EllipsisLoc = SourceLocation(); | |||
4404 | } | |||
4405 | } else { | |||
4406 | // Check for any unexpanded parameter packs. | |||
4407 | if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) | |||
4408 | return true; | |||
4409 | ||||
4410 | if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) | |||
4411 | return true; | |||
4412 | } | |||
4413 | ||||
4414 | // Check for direct and virtual base classes. | |||
4415 | const CXXBaseSpecifier *DirectBaseSpec = nullptr; | |||
4416 | const CXXBaseSpecifier *VirtualBaseSpec = nullptr; | |||
4417 | if (!Dependent) { | |||
4418 | if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), | |||
4419 | BaseType)) | |||
4420 | return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); | |||
4421 | ||||
4422 | FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, | |||
4423 | VirtualBaseSpec); | |||
4424 | ||||
4425 | // C++ [base.class.init]p2: | |||
4426 | // Unless the mem-initializer-id names a nonstatic data member of the | |||
4427 | // constructor's class or a direct or virtual base of that class, the | |||
4428 | // mem-initializer is ill-formed. | |||
4429 | if (!DirectBaseSpec && !VirtualBaseSpec) { | |||
4430 | // If the class has any dependent bases, then it's possible that | |||
4431 | // one of those types will resolve to the same type as | |||
4432 | // BaseType. Therefore, just treat this as a dependent base | |||
4433 | // class initialization. FIXME: Should we try to check the | |||
4434 | // initialization anyway? It seems odd. | |||
4435 | if (ClassDecl->hasAnyDependentBases()) | |||
4436 | Dependent = true; | |||
4437 | else | |||
4438 | return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) | |||
4439 | << BaseType << Context.getTypeDeclType(ClassDecl) | |||
4440 | << BaseTInfo->getTypeLoc().getLocalSourceRange(); | |||
4441 | } | |||
4442 | } | |||
4443 | ||||
4444 | if (Dependent) { | |||
4445 | DiscardCleanupsInEvaluationContext(); | |||
4446 | ||||
4447 | return new (Context) CXXCtorInitializer(Context, BaseTInfo, | |||
4448 | /*IsVirtual=*/false, | |||
4449 | InitRange.getBegin(), Init, | |||
4450 | InitRange.getEnd(), EllipsisLoc); | |||
4451 | } | |||
4452 | ||||
4453 | // C++ [base.class.init]p2: | |||
4454 | // If a mem-initializer-id is ambiguous because it designates both | |||
4455 | // a direct non-virtual base class and an inherited virtual base | |||
4456 | // class, the mem-initializer is ill-formed. | |||
4457 | if (DirectBaseSpec && VirtualBaseSpec) | |||
4458 | return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) | |||
4459 | << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); | |||
4460 | ||||
4461 | const CXXBaseSpecifier *BaseSpec = DirectBaseSpec; | |||
4462 | if (!BaseSpec) | |||
4463 | BaseSpec = VirtualBaseSpec; | |||
4464 | ||||
4465 | // Initialize the base. | |||
4466 | bool InitList = true; | |||
4467 | MultiExprArg Args = Init; | |||
4468 | if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { | |||
4469 | InitList = false; | |||
4470 | Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); | |||
4471 | } | |||
4472 | ||||
4473 | InitializedEntity BaseEntity = | |||
4474 | InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); | |||
4475 | InitializationKind Kind = | |||
4476 | InitList ? InitializationKind::CreateDirectList(BaseLoc) | |||
4477 | : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), | |||
4478 | InitRange.getEnd()); | |||
4479 | InitializationSequence InitSeq(*this, BaseEntity, Kind, Args); | |||
4480 | ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, Args, nullptr); | |||
4481 | if (BaseInit.isInvalid()) | |||
4482 | return true; | |||
4483 | ||||
4484 | // C++11 [class.base.init]p7: | |||
4485 | // The initialization of each base and member constitutes a | |||
4486 | // full-expression. | |||
4487 | BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin(), | |||
4488 | /*DiscardedValue*/ false); | |||
4489 | if (BaseInit.isInvalid()) | |||
4490 | return true; | |||
4491 | ||||
4492 | // If we are in a dependent context, template instantiation will | |||
4493 | // perform this type-checking again. Just save the arguments that we | |||
4494 | // received in a ParenListExpr. | |||
4495 | // FIXME: This isn't quite ideal, since our ASTs don't capture all | |||
4496 | // of the information that we have about the base | |||
4497 | // initializer. However, deconstructing the ASTs is a dicey process, | |||
4498 | // and this approach is far more likely to get the corner cases right. | |||
4499 | if (CurContext->isDependentContext()) | |||
4500 | BaseInit = Init; | |||
4501 | ||||
4502 | return new (Context) CXXCtorInitializer(Context, BaseTInfo, | |||
4503 | BaseSpec->isVirtual(), | |||
4504 | InitRange.getBegin(), | |||
4505 | BaseInit.getAs<Expr>(), | |||
4506 | InitRange.getEnd(), EllipsisLoc); | |||
4507 | } | |||
4508 | ||||
4509 | // Create a static_cast\<T&&>(expr). | |||
4510 | static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) { | |||
4511 | if (T.isNull()) T = E->getType(); | |||
4512 | QualType TargetType = SemaRef.BuildReferenceType( | |||
4513 | T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName()); | |||
4514 | SourceLocation ExprLoc = E->getBeginLoc(); | |||
4515 | TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( | |||
4516 | TargetType, ExprLoc); | |||
4517 | ||||
4518 | return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, | |||
4519 | SourceRange(ExprLoc, ExprLoc), | |||
4520 | E->getSourceRange()).get(); | |||
4521 | } | |||
4522 | ||||
4523 | /// ImplicitInitializerKind - How an implicit base or member initializer should | |||
4524 | /// initialize its base or member. | |||
4525 | enum ImplicitInitializerKind { | |||
4526 | IIK_Default, | |||
4527 | IIK_Copy, | |||
4528 | IIK_Move, | |||
4529 | IIK_Inherit | |||
4530 | }; | |||
4531 | ||||
4532 | static bool | |||
4533 | BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, | |||
4534 | ImplicitInitializerKind ImplicitInitKind, | |||
4535 | CXXBaseSpecifier *BaseSpec, | |||
4536 | bool IsInheritedVirtualBase, | |||
4537 | CXXCtorInitializer *&CXXBaseInit) { | |||
4538 | InitializedEntity InitEntity | |||
4539 | = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, | |||
4540 | IsInheritedVirtualBase); | |||
4541 | ||||
4542 | ExprResult BaseInit; | |||
4543 | ||||
4544 | switch (ImplicitInitKind) { | |||
4545 | case IIK_Inherit: | |||
4546 | case IIK_Default: { | |||
4547 | InitializationKind InitKind | |||
4548 | = InitializationKind::CreateDefault(Constructor->getLocation()); | |||
4549 | InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); | |||
4550 | BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, None); | |||
4551 | break; | |||
4552 | } | |||
4553 | ||||
4554 | case IIK_Move: | |||
4555 | case IIK_Copy: { | |||
4556 | bool Moving = ImplicitInitKind == IIK_Move; | |||
4557 | ParmVarDecl *Param = Constructor->getParamDecl(0); | |||
4558 | QualType ParamType = Param->getType().getNonReferenceType(); | |||
4559 | ||||
4560 | Expr *CopyCtorArg = | |||
4561 | DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), | |||
4562 | SourceLocation(), Param, false, | |||
4563 | Constructor->getLocation(), ParamType, | |||
4564 | VK_LValue, nullptr); | |||
4565 | ||||
4566 | SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); | |||
4567 | ||||
4568 | // Cast to the base class to avoid ambiguities. | |||
4569 | QualType ArgTy = | |||
4570 | SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), | |||
4571 | ParamType.getQualifiers()); | |||
4572 | ||||
4573 | if (Moving) { | |||
4574 | CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); | |||
4575 | } | |||
4576 | ||||
4577 | CXXCastPath BasePath; | |||
4578 | BasePath.push_back(BaseSpec); | |||
4579 | CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, | |||
4580 | CK_UncheckedDerivedToBase, | |||
4581 | Moving ? VK_XValue : VK_LValue, | |||
4582 | &BasePath).get(); | |||
4583 | ||||
4584 | InitializationKind InitKind | |||
4585 | = InitializationKind::CreateDirect(Constructor->getLocation(), | |||
4586 | SourceLocation(), SourceLocation()); | |||
4587 | InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, CopyCtorArg); | |||
4588 | BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, CopyCtorArg); | |||
4589 | break; | |||
4590 | } | |||
4591 | } | |||
4592 | ||||
4593 | BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); | |||
4594 | if (BaseInit.isInvalid()) | |||
4595 | return true; | |||
4596 | ||||
4597 | CXXBaseInit = | |||
4598 | new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, | |||
4599 | SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), | |||
4600 | SourceLocation()), | |||
4601 | BaseSpec->isVirtual(), | |||
4602 | SourceLocation(), | |||
4603 | BaseInit.getAs<Expr>(), | |||
4604 | SourceLocation(), | |||
4605 | SourceLocation()); | |||
4606 | ||||
4607 | return false; | |||
4608 | } | |||
4609 | ||||
4610 | static bool RefersToRValueRef(Expr *MemRef) { | |||
4611 | ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); | |||
4612 | return Referenced->getType()->isRValueReferenceType(); | |||
4613 | } | |||
4614 | ||||
4615 | static bool | |||
4616 | BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, | |||
4617 | ImplicitInitializerKind ImplicitInitKind, | |||
4618 | FieldDecl *Field, IndirectFieldDecl *Indirect, | |||
4619 | CXXCtorInitializer *&CXXMemberInit) { | |||
4620 | if (Field->isInvalidDecl()) | |||
4621 | return true; | |||
4622 | ||||
4623 | SourceLocation Loc = Constructor->getLocation(); | |||
4624 | ||||
4625 | if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { | |||
4626 | bool Moving = ImplicitInitKind == IIK_Move; | |||
4627 | ParmVarDecl *Param = Constructor->getParamDecl(0); | |||
4628 | QualType ParamType = Param->getType().getNonReferenceType(); | |||
4629 | ||||
4630 | // Suppress copying zero-width bitfields. | |||
4631 | if (Field->isZeroLengthBitField(SemaRef.Context)) | |||
4632 | return false; | |||
4633 | ||||
4634 | Expr *MemberExprBase = | |||
4635 | DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), | |||
4636 | SourceLocation(), Param, false, | |||
4637 | Loc, ParamType, VK_LValue, nullptr); | |||
4638 | ||||
4639 | SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); | |||
4640 | ||||
4641 | if (Moving) { | |||
4642 | MemberExprBase = CastForMoving(SemaRef, MemberExprBase); | |||
4643 | } | |||
4644 | ||||
4645 | // Build a reference to this field within the parameter. | |||
4646 | CXXScopeSpec SS; | |||
4647 | LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, | |||
4648 | Sema::LookupMemberName); | |||
4649 | MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) | |||
4650 | : cast<ValueDecl>(Field), AS_public); | |||
4651 | MemberLookup.resolveKind(); | |||
4652 | ExprResult CtorArg | |||
4653 | = SemaRef.BuildMemberReferenceExpr(MemberExprBase, | |||
4654 | ParamType, Loc, | |||
4655 | /*IsArrow=*/false, | |||
4656 | SS, | |||
4657 | /*TemplateKWLoc=*/SourceLocation(), | |||
4658 | /*FirstQualifierInScope=*/nullptr, | |||
4659 | MemberLookup, | |||
4660 | /*TemplateArgs=*/nullptr, | |||
4661 | /*S*/nullptr); | |||
4662 | if (CtorArg.isInvalid()) | |||
4663 | return true; | |||
4664 | ||||
4665 | // C++11 [class.copy]p15: | |||
4666 | // - if a member m has rvalue reference type T&&, it is direct-initialized | |||
4667 | // with static_cast<T&&>(x.m); | |||
4668 | if (RefersToRValueRef(CtorArg.get())) { | |||
4669 | CtorArg = CastForMoving(SemaRef, CtorArg.get()); | |||
4670 | } | |||
4671 | ||||
4672 | InitializedEntity Entity = | |||
4673 | Indirect ? InitializedEntity::InitializeMember(Indirect, nullptr, | |||
4674 | /*Implicit*/ true) | |||
4675 | : InitializedEntity::InitializeMember(Field, nullptr, | |||
4676 | /*Implicit*/ true); | |||
4677 | ||||
4678 | // Direct-initialize to use the copy constructor. | |||
4679 | InitializationKind InitKind = | |||
4680 | InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); | |||
4681 | ||||
4682 | Expr *CtorArgE = CtorArg.getAs<Expr>(); | |||
4683 | InitializationSequence InitSeq(SemaRef, Entity, InitKind, CtorArgE); | |||
4684 | ExprResult MemberInit = | |||
4685 | InitSeq.Perform(SemaRef, Entity, InitKind, MultiExprArg(&CtorArgE, 1)); | |||
4686 | MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); | |||
4687 | if (MemberInit.isInvalid()) | |||
4688 | return true; | |||
4689 | ||||
4690 | if (Indirect) | |||
4691 | CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer( | |||
4692 | SemaRef.Context, Indirect, Loc, Loc, MemberInit.getAs<Expr>(), Loc); | |||
4693 | else | |||
4694 | CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer( | |||
4695 | SemaRef.Context, Field, Loc, Loc, MemberInit.getAs<Expr>(), Loc); | |||
4696 | return false; | |||
4697 | } | |||
4698 | ||||
4699 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 4700, __PRETTY_FUNCTION__)) | |||
4700 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 4700, __PRETTY_FUNCTION__)); | |||
4701 | ||||
4702 | QualType FieldBaseElementType = | |||
4703 | SemaRef.Context.getBaseElementType(Field->getType()); | |||
4704 | ||||
4705 | if (FieldBaseElementType->isRecordType()) { | |||
4706 | InitializedEntity InitEntity = | |||
4707 | Indirect ? InitializedEntity::InitializeMember(Indirect, nullptr, | |||
4708 | /*Implicit*/ true) | |||
4709 | : InitializedEntity::InitializeMember(Field, nullptr, | |||
4710 | /*Implicit*/ true); | |||
4711 | InitializationKind InitKind = | |||
4712 | InitializationKind::CreateDefault(Loc); | |||
4713 | ||||
4714 | InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); | |||
4715 | ExprResult MemberInit = | |||
4716 | InitSeq.Perform(SemaRef, InitEntity, InitKind, None); | |||
4717 | ||||
4718 | MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); | |||
4719 | if (MemberInit.isInvalid()) | |||
4720 | return true; | |||
4721 | ||||
4722 | if (Indirect) | |||
4723 | CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, | |||
4724 | Indirect, Loc, | |||
4725 | Loc, | |||
4726 | MemberInit.get(), | |||
4727 | Loc); | |||
4728 | else | |||
4729 | CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, | |||
4730 | Field, Loc, Loc, | |||
4731 | MemberInit.get(), | |||
4732 | Loc); | |||
4733 | return false; | |||
4734 | } | |||
4735 | ||||
4736 | if (!Field->getParent()->isUnion()) { | |||
4737 | if (FieldBaseElementType->isReferenceType()) { | |||
4738 | SemaRef.Diag(Constructor->getLocation(), | |||
4739 | diag::err_uninitialized_member_in_ctor) | |||
4740 | << (int)Constructor->isImplicit() | |||
4741 | << SemaRef.Context.getTagDeclType(Constructor->getParent()) | |||
4742 | << 0 << Field->getDeclName(); | |||
4743 | SemaRef.Diag(Field->getLocation(), diag::note_declared_at); | |||
4744 | return true; | |||
4745 | } | |||
4746 | ||||
4747 | if (FieldBaseElementType.isConstQualified()) { | |||
4748 | SemaRef.Diag(Constructor->getLocation(), | |||
4749 | diag::err_uninitialized_member_in_ctor) | |||
4750 | << (int)Constructor->isImplicit() | |||
4751 | << SemaRef.Context.getTagDeclType(Constructor->getParent()) | |||
4752 | << 1 << Field->getDeclName(); | |||
4753 | SemaRef.Diag(Field->getLocation(), diag::note_declared_at); | |||
4754 | return true; | |||
4755 | } | |||
4756 | } | |||
4757 | ||||
4758 | if (FieldBaseElementType.hasNonTrivialObjCLifetime()) { | |||
4759 | // ARC and Weak: | |||
4760 | // Default-initialize Objective-C pointers to NULL. | |||
4761 | CXXMemberInit | |||
4762 | = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, | |||
4763 | Loc, Loc, | |||
4764 | new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), | |||
4765 | Loc); | |||
4766 | return false; | |||
4767 | } | |||
4768 | ||||
4769 | // Nothing to initialize. | |||
4770 | CXXMemberInit = nullptr; | |||
4771 | return false; | |||
4772 | } | |||
4773 | ||||
4774 | namespace { | |||
4775 | struct BaseAndFieldInfo { | |||
4776 | Sema &S; | |||
4777 | CXXConstructorDecl *Ctor; | |||
4778 | bool AnyErrorsInInits; | |||
4779 | ImplicitInitializerKind IIK; | |||
4780 | llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; | |||
4781 | SmallVector<CXXCtorInitializer*, 8> AllToInit; | |||
4782 | llvm::DenseMap<TagDecl*, FieldDecl*> ActiveUnionMember; | |||
4783 | ||||
4784 | BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) | |||
4785 | : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { | |||
4786 | bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); | |||
4787 | if (Ctor->getInheritedConstructor()) | |||
4788 | IIK = IIK_Inherit; | |||
4789 | else if (Generated && Ctor->isCopyConstructor()) | |||
4790 | IIK = IIK_Copy; | |||
4791 | else if (Generated && Ctor->isMoveConstructor()) | |||
4792 | IIK = IIK_Move; | |||
4793 | else | |||
4794 | IIK = IIK_Default; | |||
4795 | } | |||
4796 | ||||
4797 | bool isImplicitCopyOrMove() const { | |||
4798 | switch (IIK) { | |||
4799 | case IIK_Copy: | |||
4800 | case IIK_Move: | |||
4801 | return true; | |||
4802 | ||||
4803 | case IIK_Default: | |||
4804 | case IIK_Inherit: | |||
4805 | return false; | |||
4806 | } | |||
4807 | ||||
4808 | llvm_unreachable("Invalid ImplicitInitializerKind!")::llvm::llvm_unreachable_internal("Invalid ImplicitInitializerKind!" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 4808); | |||
4809 | } | |||
4810 | ||||
4811 | bool addFieldInitializer(CXXCtorInitializer *Init) { | |||
4812 | AllToInit.push_back(Init); | |||
4813 | ||||
4814 | // Check whether this initializer makes the field "used". | |||
4815 | if (Init->getInit()->HasSideEffects(S.Context)) | |||
4816 | S.UnusedPrivateFields.remove(Init->getAnyMember()); | |||
4817 | ||||
4818 | return false; | |||
4819 | } | |||
4820 | ||||
4821 | bool isInactiveUnionMember(FieldDecl *Field) { | |||
4822 | RecordDecl *Record = Field->getParent(); | |||
4823 | if (!Record->isUnion()) | |||
4824 | return false; | |||
4825 | ||||
4826 | if (FieldDecl *Active = | |||
4827 | ActiveUnionMember.lookup(Record->getCanonicalDecl())) | |||
4828 | return Active != Field->getCanonicalDecl(); | |||
4829 | ||||
4830 | // In an implicit copy or move constructor, ignore any in-class initializer. | |||
4831 | if (isImplicitCopyOrMove()) | |||
4832 | return true; | |||
4833 | ||||
4834 | // If there's no explicit initialization, the field is active only if it | |||
4835 | // has an in-class initializer... | |||
4836 | if (Field->hasInClassInitializer()) | |||
4837 | return false; | |||
4838 | // ... or it's an anonymous struct or union whose class has an in-class | |||
4839 | // initializer. | |||
4840 | if (!Field->isAnonymousStructOrUnion()) | |||
4841 | return true; | |||
4842 | CXXRecordDecl *FieldRD = Field->getType()->getAsCXXRecordDecl(); | |||
4843 | return !FieldRD->hasInClassInitializer(); | |||
4844 | } | |||
4845 | ||||
4846 | /// Determine whether the given field is, or is within, a union member | |||
4847 | /// that is inactive (because there was an initializer given for a different | |||
4848 | /// member of the union, or because the union was not initialized at all). | |||
4849 | bool isWithinInactiveUnionMember(FieldDecl *Field, | |||
4850 | IndirectFieldDecl *Indirect) { | |||
4851 | if (!Indirect) | |||
4852 | return isInactiveUnionMember(Field); | |||
4853 | ||||
4854 | for (auto *C : Indirect->chain()) { | |||
4855 | FieldDecl *Field = dyn_cast<FieldDecl>(C); | |||
4856 | if (Field && isInactiveUnionMember(Field)) | |||
4857 | return true; | |||
4858 | } | |||
4859 | return false; | |||
4860 | } | |||
4861 | }; | |||
4862 | } | |||
4863 | ||||
4864 | /// Determine whether the given type is an incomplete or zero-lenfgth | |||
4865 | /// array type. | |||
4866 | static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { | |||
4867 | if (T->isIncompleteArrayType()) | |||
4868 | return true; | |||
4869 | ||||
4870 | while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { | |||
4871 | if (!ArrayT->getSize()) | |||
4872 | return true; | |||
4873 | ||||
4874 | T = ArrayT->getElementType(); | |||
4875 | } | |||
4876 | ||||
4877 | return false; | |||
4878 | } | |||
4879 | ||||
4880 | static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, | |||
4881 | FieldDecl *Field, | |||
4882 | IndirectFieldDecl *Indirect = nullptr) { | |||
4883 | if (Field->isInvalidDecl()) | |||
4884 | return false; | |||
4885 | ||||
4886 | // Overwhelmingly common case: we have a direct initializer for this field. | |||
4887 | if (CXXCtorInitializer *Init = | |||
4888 | Info.AllBaseFields.lookup(Field->getCanonicalDecl())) | |||
4889 | return Info.addFieldInitializer(Init); | |||
4890 | ||||
4891 | // C++11 [class.base.init]p8: | |||
4892 | // if the entity is a non-static data member that has a | |||
4893 | // brace-or-equal-initializer and either | |||
4894 | // -- the constructor's class is a union and no other variant member of that | |||
4895 | // union is designated by a mem-initializer-id or | |||
4896 | // -- the constructor's class is not a union, and, if the entity is a member | |||
4897 | // of an anonymous union, no other member of that union is designated by | |||
4898 | // a mem-initializer-id, | |||
4899 | // the entity is initialized as specified in [dcl.init]. | |||
4900 | // | |||
4901 | // We also apply the same rules to handle anonymous structs within anonymous | |||
4902 | // unions. | |||
4903 | if (Info.isWithinInactiveUnionMember(Field, Indirect)) | |||
4904 | return false; | |||
4905 | ||||
4906 | if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { | |||
4907 | ExprResult DIE = | |||
4908 | SemaRef.BuildCXXDefaultInitExpr(Info.Ctor->getLocation(), Field); | |||
4909 | if (DIE.isInvalid()) | |||
4910 | return true; | |||
4911 | ||||
4912 | auto Entity = InitializedEntity::InitializeMember(Field, nullptr, true); | |||
4913 | SemaRef.checkInitializerLifetime(Entity, DIE.get()); | |||
4914 | ||||
4915 | CXXCtorInitializer *Init; | |||
4916 | if (Indirect) | |||
4917 | Init = new (SemaRef.Context) | |||
4918 | CXXCtorInitializer(SemaRef.Context, Indirect, SourceLocation(), | |||
4919 | SourceLocation(), DIE.get(), SourceLocation()); | |||
4920 | else | |||
4921 | Init = new (SemaRef.Context) | |||
4922 | CXXCtorInitializer(SemaRef.Context, Field, SourceLocation(), | |||
4923 | SourceLocation(), DIE.get(), SourceLocation()); | |||
4924 | return Info.addFieldInitializer(Init); | |||
4925 | } | |||
4926 | ||||
4927 | // Don't initialize incomplete or zero-length arrays. | |||
4928 | if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) | |||
4929 | return false; | |||
4930 | ||||
4931 | // Don't try to build an implicit initializer if there were semantic | |||
4932 | // errors in any of the initializers (and therefore we might be | |||
4933 | // missing some that the user actually wrote). | |||
4934 | if (Info.AnyErrorsInInits) | |||
4935 | return false; | |||
4936 | ||||
4937 | CXXCtorInitializer *Init = nullptr; | |||
4938 | if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, | |||
4939 | Indirect, Init)) | |||
4940 | return true; | |||
4941 | ||||
4942 | if (!Init) | |||
4943 | return false; | |||
4944 | ||||
4945 | return Info.addFieldInitializer(Init); | |||
4946 | } | |||
4947 | ||||
4948 | bool | |||
4949 | Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, | |||
4950 | CXXCtorInitializer *Initializer) { | |||
4951 | assert(Initializer->isDelegatingInitializer())((Initializer->isDelegatingInitializer()) ? static_cast< void> (0) : __assert_fail ("Initializer->isDelegatingInitializer()" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 4951, __PRETTY_FUNCTION__)); | |||
4952 | Constructor->setNumCtorInitializers(1); | |||
4953 | CXXCtorInitializer **initializer = | |||
4954 | new (Context) CXXCtorInitializer*[1]; | |||
4955 | memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); | |||
4956 | Constructor->setCtorInitializers(initializer); | |||
4957 | ||||
4958 | if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { | |||
4959 | MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); | |||
4960 | DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); | |||
4961 | } | |||
4962 | ||||
4963 | DelegatingCtorDecls.push_back(Constructor); | |||
4964 | ||||
4965 | DiagnoseUninitializedFields(*this, Constructor); | |||
4966 | ||||
4967 | return false; | |||
4968 | } | |||
4969 | ||||
4970 | bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors, | |||
4971 | ArrayRef<CXXCtorInitializer *> Initializers) { | |||
4972 | if (Constructor->isDependentContext()) { | |||
4973 | // Just store the initializers as written, they will be checked during | |||
4974 | // instantiation. | |||
4975 | if (!Initializers.empty()) { | |||
4976 | Constructor->setNumCtorInitializers(Initializers.size()); | |||
4977 | CXXCtorInitializer **baseOrMemberInitializers = | |||
4978 | new (Context) CXXCtorInitializer*[Initializers.size()]; | |||
4979 | memcpy(baseOrMemberInitializers, Initializers.data(), | |||
4980 | Initializers.size() * sizeof(CXXCtorInitializer*)); | |||
4981 | Constructor->setCtorInitializers(baseOrMemberInitializers); | |||
4982 | } | |||
4983 | ||||
4984 | // Let template instantiation know whether we had errors. | |||
4985 | if (AnyErrors) | |||
4986 | Constructor->setInvalidDecl(); | |||
4987 | ||||
4988 | return false; | |||
4989 | } | |||
4990 | ||||
4991 | BaseAndFieldInfo Info(*this, Constructor, AnyErrors); | |||
4992 | ||||
4993 | // We need to build the initializer AST according to order of construction | |||
4994 | // and not what user specified in the Initializers list. | |||
4995 | CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); | |||
4996 | if (!ClassDecl) | |||
4997 | return true; | |||
4998 | ||||
4999 | bool HadError = false; | |||
5000 | ||||
5001 | for (unsigned i = 0; i < Initializers.size(); i++) { | |||
5002 | CXXCtorInitializer *Member = Initializers[i]; | |||
5003 | ||||
5004 | if (Member->isBaseInitializer()) | |||
5005 | Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; | |||
5006 | else { | |||
5007 | Info.AllBaseFields[Member->getAnyMember()->getCanonicalDecl()] = Member; | |||
5008 | ||||
5009 | if (IndirectFieldDecl *F = Member->getIndirectMember()) { | |||
5010 | for (auto *C : F->chain()) { | |||
5011 | FieldDecl *FD = dyn_cast<FieldDecl>(C); | |||
5012 | if (FD && FD->getParent()->isUnion()) | |||
5013 | Info.ActiveUnionMember.insert(std::make_pair( | |||
5014 | FD->getParent()->getCanonicalDecl(), FD->getCanonicalDecl())); | |||
5015 | } | |||
5016 | } else if (FieldDecl *FD = Member->getMember()) { | |||
5017 | if (FD->getParent()->isUnion()) | |||
5018 | Info.ActiveUnionMember.insert(std::make_pair( | |||
5019 | FD->getParent()->getCanonicalDecl(), FD->getCanonicalDecl())); | |||
5020 | } | |||
5021 | } | |||
5022 | } | |||
5023 | ||||
5024 | // Keep track of the direct virtual bases. | |||
5025 | llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; | |||
5026 | for (auto &I : ClassDecl->bases()) { | |||
5027 | if (I.isVirtual()) | |||
5028 | DirectVBases.insert(&I); | |||
5029 | } | |||
5030 | ||||
5031 | // Push virtual bases before others. | |||
5032 | for (auto &VBase : ClassDecl->vbases()) { | |||
5033 | if (CXXCtorInitializer *Value | |||
5034 | = Info.AllBaseFields.lookup(VBase.getType()->getAs<RecordType>())) { | |||
5035 | // [class.base.init]p7, per DR257: | |||
5036 | // A mem-initializer where the mem-initializer-id names a virtual base | |||
5037 | // class is ignored during execution of a constructor of any class that | |||
5038 | // is not the most derived class. | |||
5039 | if (ClassDecl->isAbstract()) { | |||
5040 | // FIXME: Provide a fixit to remove the base specifier. This requires | |||
5041 | // tracking the location of the associated comma for a base specifier. | |||
5042 | Diag(Value->getSourceLocation(), diag::warn_abstract_vbase_init_ignored) | |||
5043 | << VBase.getType() << ClassDecl; | |||
5044 | DiagnoseAbstractType(ClassDecl); | |||
5045 | } | |||
5046 | ||||
5047 | Info.AllToInit.push_back(Value); | |||
5048 | } else if (!AnyErrors && !ClassDecl->isAbstract()) { | |||
5049 | // [class.base.init]p8, per DR257: | |||
5050 | // If a given [...] base class is not named by a mem-initializer-id | |||
5051 | // [...] and the entity is not a virtual base class of an abstract | |||
5052 | // class, then [...] the entity is default-initialized. | |||
5053 | bool IsInheritedVirtualBase = !DirectVBases.count(&VBase); | |||
5054 | CXXCtorInitializer *CXXBaseInit; | |||
5055 | if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, | |||
5056 | &VBase, IsInheritedVirtualBase, | |||
5057 | CXXBaseInit)) { | |||
5058 | HadError = true; | |||
5059 | continue; | |||
5060 | } | |||
5061 | ||||
5062 | Info.AllToInit.push_back(CXXBaseInit); | |||
5063 | } | |||
5064 | } | |||
5065 | ||||
5066 | // Non-virtual bases. | |||
5067 | for (auto &Base : ClassDecl->bases()) { | |||
5068 | // Virtuals are in the virtual base list and already constructed. | |||
5069 | if (Base.isVirtual()) | |||
5070 | continue; | |||
5071 | ||||
5072 | if (CXXCtorInitializer *Value | |||
5073 | = Info.AllBaseFields.lookup(Base.getType()->getAs<RecordType>())) { | |||
5074 | Info.AllToInit.push_back(Value); | |||
5075 | } else if (!AnyErrors) { | |||
5076 | CXXCtorInitializer *CXXBaseInit; | |||
5077 | if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, | |||
5078 | &Base, /*IsInheritedVirtualBase=*/false, | |||
5079 | CXXBaseInit)) { | |||
5080 | HadError = true; | |||
5081 | continue; | |||
5082 | } | |||
5083 | ||||
5084 | Info.AllToInit.push_back(CXXBaseInit); | |||
5085 | } | |||
5086 | } | |||
5087 | ||||
5088 | // Fields. | |||
5089 | for (auto *Mem : ClassDecl->decls()) { | |||
5090 | if (auto *F = dyn_cast<FieldDecl>(Mem)) { | |||
5091 | // C++ [class.bit]p2: | |||
5092 | // A declaration for a bit-field that omits the identifier declares an | |||
5093 | // unnamed bit-field. Unnamed bit-fields are not members and cannot be | |||
5094 | // initialized. | |||
5095 | if (F->isUnnamedBitfield()) | |||
5096 | continue; | |||
5097 | ||||
5098 | // If we're not generating the implicit copy/move constructor, then we'll | |||
5099 | // handle anonymous struct/union fields based on their individual | |||
5100 | // indirect fields. | |||
5101 | if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove()) | |||
5102 | continue; | |||
5103 | ||||
5104 | if (CollectFieldInitializer(*this, Info, F)) | |||
5105 | HadError = true; | |||
5106 | continue; | |||
5107 | } | |||
5108 | ||||
5109 | // Beyond this point, we only consider default initialization. | |||
5110 | if (Info.isImplicitCopyOrMove()) | |||
5111 | continue; | |||
5112 | ||||
5113 | if (auto *F = dyn_cast<IndirectFieldDecl>(Mem)) { | |||
5114 | if (F->getType()->isIncompleteArrayType()) { | |||
5115 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 5116, __PRETTY_FUNCTION__)) | |||
5116 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 5116, __PRETTY_FUNCTION__)); | |||
5117 | continue; | |||
5118 | } | |||
5119 | ||||
5120 | // Initialize each field of an anonymous struct individually. | |||
5121 | if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) | |||
5122 | HadError = true; | |||
5123 | ||||
5124 | continue; | |||
5125 | } | |||
5126 | } | |||
5127 | ||||
5128 | unsigned NumInitializers = Info.AllToInit.size(); | |||
5129 | if (NumInitializers > 0) { | |||
5130 | Constructor->setNumCtorInitializers(NumInitializers); | |||
5131 | CXXCtorInitializer **baseOrMemberInitializers = | |||
5132 | new (Context) CXXCtorInitializer*[NumInitializers]; | |||
5133 | memcpy(baseOrMemberInitializers, Info.AllToInit.data(), | |||
5134 | NumInitializers * sizeof(CXXCtorInitializer*)); | |||
5135 | Constructor->setCtorInitializers(baseOrMemberInitializers); | |||
5136 | ||||
5137 | // Constructors implicitly reference the base and member | |||
5138 | // destructors. | |||
5139 | MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), | |||
5140 | Constructor->getParent()); | |||
5141 | } | |||
5142 | ||||
5143 | return HadError; | |||
5144 | } | |||
5145 | ||||
5146 | static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) { | |||
5147 | if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { | |||
5148 | const RecordDecl *RD = RT->getDecl(); | |||
5149 | if (RD->isAnonymousStructOrUnion()) { | |||
5150 | for (auto *Field : RD->fields()) | |||
5151 | PopulateKeysForFields(Field, IdealInits); | |||
5152 | return; | |||
5153 | } | |||
5154 | } | |||
5155 | IdealInits.push_back(Field->getCanonicalDecl()); | |||
5156 | } | |||
5157 | ||||
5158 | static const void *GetKeyForBase(ASTContext &Context, QualType BaseType) { | |||
5159 | return Context.getCanonicalType(BaseType).getTypePtr(); | |||
5160 | } | |||
5161 | ||||
5162 | static const void *GetKeyForMember(ASTContext &Context, | |||
5163 | CXXCtorInitializer *Member) { | |||
5164 | if (!Member->isAnyMemberInitializer()) | |||
5165 | return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); | |||
5166 | ||||
5167 | return Member->getAnyMember()->getCanonicalDecl(); | |||
5168 | } | |||
5169 | ||||
5170 | static void DiagnoseBaseOrMemInitializerOrder( | |||
5171 | Sema &SemaRef, const CXXConstructorDecl *Constructor, | |||
5172 | ArrayRef<CXXCtorInitializer *> Inits) { | |||
5173 | if (Constructor->getDeclContext()->isDependentContext()) | |||
5174 | return; | |||
5175 | ||||
5176 | // Don't check initializers order unless the warning is enabled at the | |||
5177 | // location of at least one initializer. | |||
5178 | bool ShouldCheckOrder = false; | |||
5179 | for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { | |||
5180 | CXXCtorInitializer *Init = Inits[InitIndex]; | |||
5181 | if (!SemaRef.Diags.isIgnored(diag::warn_initializer_out_of_order, | |||
5182 | Init->getSourceLocation())) { | |||
5183 | ShouldCheckOrder = true; | |||
5184 | break; | |||
5185 | } | |||
5186 | } | |||
5187 | if (!ShouldCheckOrder) | |||
5188 | return; | |||
5189 | ||||
5190 | // Build the list of bases and members in the order that they'll | |||
5191 | // actually be initialized. The explicit initializers should be in | |||
5192 | // this same order but may be missing things. | |||
5193 | SmallVector<const void*, 32> IdealInitKeys; | |||
5194 | ||||
5195 | const CXXRecordDecl *ClassDecl = Constructor->getParent(); | |||
5196 | ||||
5197 | // 1. Virtual bases. | |||
5198 | for (const auto &VBase : ClassDecl->vbases()) | |||
5199 | IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase.getType())); | |||
5200 | ||||
5201 | // 2. Non-virtual bases. | |||
5202 | for (const auto &Base : ClassDecl->bases()) { | |||
5203 | if (Base.isVirtual()) | |||
5204 | continue; | |||
5205 | IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base.getType())); | |||
5206 | } | |||
5207 | ||||
5208 | // 3. Direct fields. | |||
5209 | for (auto *Field : ClassDecl->fields()) { | |||
5210 | if (Field->isUnnamedBitfield()) | |||
5211 | continue; | |||
5212 | ||||
5213 | PopulateKeysForFields(Field, IdealInitKeys); | |||
5214 | } | |||
5215 | ||||
5216 | unsigned NumIdealInits = IdealInitKeys.size(); | |||
5217 | unsigned IdealIndex = 0; | |||
5218 | ||||
5219 | CXXCtorInitializer *PrevInit = nullptr; | |||
5220 | for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { | |||
5221 | CXXCtorInitializer *Init = Inits[InitIndex]; | |||
5222 | const void *InitKey = GetKeyForMember(SemaRef.Context, Init); | |||
5223 | ||||
5224 | // Scan forward to try to find this initializer in the idealized | |||
5225 | // initializers list. | |||
5226 | for (; IdealIndex != NumIdealInits; ++IdealIndex) | |||
5227 | if (InitKey == IdealInitKeys[IdealIndex]) | |||
5228 | break; | |||
5229 | ||||
5230 | // If we didn't find this initializer, it must be because we | |||
5231 | // scanned past it on a previous iteration. That can only | |||
5232 | // happen if we're out of order; emit a warning. | |||
5233 | if (IdealIndex == NumIdealInits && PrevInit) { | |||
5234 | Sema::SemaDiagnosticBuilder D = | |||
5235 | SemaRef.Diag(PrevInit->getSourceLocation(), | |||
5236 | diag::warn_initializer_out_of_order); | |||
5237 | ||||
5238 | if (PrevInit->isAnyMemberInitializer()) | |||
5239 | D << 0 << PrevInit->getAnyMember()->getDeclName(); | |||
5240 | else | |||
5241 | D << 1 << PrevInit->getTypeSourceInfo()->getType(); | |||
5242 | ||||
5243 | if (Init->isAnyMemberInitializer()) | |||
5244 | D << 0 << Init->getAnyMember()->getDeclName(); | |||
5245 | else | |||
5246 | D << 1 << Init->getTypeSourceInfo()->getType(); | |||
5247 | ||||
5248 | // Move back to the initializer's location in the ideal list. | |||
5249 | for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) | |||
5250 | if (InitKey == IdealInitKeys[IdealIndex]) | |||
5251 | break; | |||
5252 | ||||
5253 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 5254, __PRETTY_FUNCTION__)) | |||
5254 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 5254, __PRETTY_FUNCTION__)); | |||
5255 | } | |||
5256 | ||||
5257 | PrevInit = Init; | |||
5258 | } | |||
5259 | } | |||
5260 | ||||
5261 | namespace { | |||
5262 | bool CheckRedundantInit(Sema &S, | |||
5263 | CXXCtorInitializer *Init, | |||
5264 | CXXCtorInitializer *&PrevInit) { | |||
5265 | if (!PrevInit) { | |||
5266 | PrevInit = Init; | |||
5267 | return false; | |||
5268 | } | |||
5269 | ||||
5270 | if (FieldDecl *Field = Init->getAnyMember()) | |||
5271 | S.Diag(Init->getSourceLocation(), | |||
5272 | diag::err_multiple_mem_initialization) | |||
5273 | << Field->getDeclName() | |||
5274 | << Init->getSourceRange(); | |||
5275 | else { | |||
5276 | const Type *BaseClass = Init->getBaseClass(); | |||
5277 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 5277, __PRETTY_FUNCTION__)); | |||
5278 | S.Diag(Init->getSourceLocation(), | |||
5279 | diag::err_multiple_base_initialization) | |||
5280 | << QualType(BaseClass, 0) | |||
5281 | << Init->getSourceRange(); | |||
5282 | } | |||
5283 | S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) | |||
5284 | << 0 << PrevInit->getSourceRange(); | |||
5285 | ||||
5286 | return true; | |||
5287 | } | |||
5288 | ||||
5289 | typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; | |||
5290 | typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; | |||
5291 | ||||
5292 | bool CheckRedundantUnionInit(Sema &S, | |||
5293 | CXXCtorInitializer *Init, | |||
5294 | RedundantUnionMap &Unions) { | |||
5295 | FieldDecl *Field = Init->getAnyMember(); | |||
5296 | RecordDecl *Parent = Field->getParent(); | |||
5297 | NamedDecl *Child = Field; | |||
5298 | ||||
5299 | while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { | |||
5300 | if (Parent->isUnion()) { | |||
5301 | UnionEntry &En = Unions[Parent]; | |||
5302 | if (En.first && En.first != Child) { | |||
5303 | S.Diag(Init->getSourceLocation(), | |||
5304 | diag::err_multiple_mem_union_initialization) | |||
5305 | << Field->getDeclName() | |||
5306 | << Init->getSourceRange(); | |||
5307 | S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) | |||
5308 | << 0 << En.second->getSourceRange(); | |||
5309 | return true; | |||
5310 | } | |||
5311 | if (!En.first) { | |||
5312 | En.first = Child; | |||
5313 | En.second = Init; | |||
5314 | } | |||
5315 | if (!Parent->isAnonymousStructOrUnion()) | |||
5316 | return false; | |||
5317 | } | |||
5318 | ||||
5319 | Child = Parent; | |||
5320 | Parent = cast<RecordDecl>(Parent->getDeclContext()); | |||
5321 | } | |||
5322 | ||||
5323 | return false; | |||
5324 | } | |||
5325 | } | |||
5326 | ||||
5327 | /// ActOnMemInitializers - Handle the member initializers for a constructor. | |||
5328 | void Sema::ActOnMemInitializers(Decl *ConstructorDecl, | |||
5329 | SourceLocation ColonLoc, | |||
5330 | ArrayRef<CXXCtorInitializer*> MemInits, | |||
5331 | bool AnyErrors) { | |||
5332 | if (!ConstructorDecl) | |||
5333 | return; | |||
5334 | ||||
5335 | AdjustDeclIfTemplate(ConstructorDecl); | |||
5336 | ||||
5337 | CXXConstructorDecl *Constructor | |||
5338 | = dyn_cast<CXXConstructorDecl>(ConstructorDecl); | |||
5339 | ||||
5340 | if (!Constructor) { | |||
5341 | Diag(ColonLoc, diag::err_only_constructors_take_base_inits); | |||
5342 | return; | |||
5343 | } | |||
5344 | ||||
5345 | // Mapping for the duplicate initializers check. | |||
5346 | // For member initializers, this is keyed with a FieldDecl*. | |||
5347 | // For base initializers, this is keyed with a Type*. | |||
5348 | llvm::DenseMap<const void *, CXXCtorInitializer *> Members; | |||
5349 | ||||
5350 | // Mapping for the inconsistent anonymous-union initializers check. | |||
5351 | RedundantUnionMap MemberUnions; | |||
5352 | ||||
5353 | bool HadError = false; | |||
5354 | for (unsigned i = 0; i < MemInits.size(); i++) { | |||
5355 | CXXCtorInitializer *Init = MemInits[i]; | |||
5356 | ||||
5357 | // Set the source order index. | |||
5358 | Init->setSourceOrder(i); | |||
5359 | ||||
5360 | if (Init->isAnyMemberInitializer()) { | |||
5361 | const void *Key = GetKeyForMember(Context, Init); | |||
5362 | if (CheckRedundantInit(*this, Init, Members[Key]) || | |||
5363 | CheckRedundantUnionInit(*this, Init, MemberUnions)) | |||
5364 | HadError = true; | |||
5365 | } else if (Init->isBaseInitializer()) { | |||
5366 | const void *Key = GetKeyForMember(Context, Init); | |||
5367 | if (CheckRedundantInit(*this, Init, Members[Key])) | |||
5368 | HadError = true; | |||
5369 | } else { | |||
5370 | assert(Init->isDelegatingInitializer())((Init->isDelegatingInitializer()) ? static_cast<void> (0) : __assert_fail ("Init->isDelegatingInitializer()", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 5370, __PRETTY_FUNCTION__)); | |||
5371 | // This must be the only initializer | |||
5372 | if (MemInits.size() != 1) { | |||
5373 | Diag(Init->getSourceLocation(), | |||
5374 | diag::err_delegating_initializer_alone) | |||
5375 | << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); | |||
5376 | // We will treat this as being the only initializer. | |||
5377 | } | |||
5378 | SetDelegatingInitializer(Constructor, MemInits[i]); | |||
5379 | // Return immediately as the initializer is set. | |||
5380 | return; | |||
5381 | } | |||
5382 | } | |||
5383 | ||||
5384 | if (HadError) | |||
5385 | return; | |||
5386 | ||||
5387 | DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits); | |||
5388 | ||||
5389 | SetCtorInitializers(Constructor, AnyErrors, MemInits); | |||
5390 | ||||
5391 | DiagnoseUninitializedFields(*this, Constructor); | |||
5392 | } | |||
5393 | ||||
5394 | void | |||
5395 | Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, | |||
5396 | CXXRecordDecl *ClassDecl) { | |||
5397 | // Ignore dependent contexts. Also ignore unions, since their members never | |||
5398 | // have destructors implicitly called. | |||
5399 | if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) | |||
5400 | return; | |||
5401 | ||||
5402 | // FIXME: all the access-control diagnostics are positioned on the | |||
5403 | // field/base declaration. That's probably good; that said, the | |||
5404 | // user might reasonably want to know why the destructor is being | |||
5405 | // emitted, and we currently don't say. | |||
5406 | ||||
5407 | // Non-static data members. | |||
5408 | for (auto *Field : ClassDecl->fields()) { | |||
5409 | if (Field->isInvalidDecl()) | |||
5410 | continue; | |||
5411 | ||||
5412 | // Don't destroy incomplete or zero-length arrays. | |||
5413 | if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) | |||
5414 | continue; | |||
5415 | ||||
5416 | QualType FieldType = Context.getBaseElementType(Field->getType()); | |||
5417 | ||||
5418 | const RecordType* RT = FieldType->getAs<RecordType>(); | |||
5419 | if (!RT) | |||
5420 | continue; | |||
5421 | ||||
5422 | CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); | |||
5423 | if (FieldClassDecl->isInvalidDecl()) | |||
5424 | continue; | |||
5425 | if (FieldClassDecl->hasIrrelevantDestructor()) | |||
5426 | continue; | |||
5427 | // The destructor for an implicit anonymous union member is never invoked. | |||
5428 | if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) | |||
5429 | continue; | |||
5430 | ||||
5431 | CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); | |||
5432 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 5432, __PRETTY_FUNCTION__)); | |||
5433 | CheckDestructorAccess(Field->getLocation(), Dtor, | |||
5434 | PDiag(diag::err_access_dtor_field) | |||
5435 | << Field->getDeclName() | |||
5436 | << FieldType); | |||
5437 | ||||
5438 | MarkFunctionReferenced(Location, Dtor); | |||
5439 | DiagnoseUseOfDecl(Dtor, Location); | |||
5440 | } | |||
5441 | ||||
5442 | // We only potentially invoke the destructors of potentially constructed | |||
5443 | // subobjects. | |||
5444 | bool VisitVirtualBases = !ClassDecl->isAbstract(); | |||
5445 | ||||
5446 | llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; | |||
5447 | ||||
5448 | // Bases. | |||
5449 | for (const auto &Base : ClassDecl->bases()) { | |||
5450 | // Bases are always records in a well-formed non-dependent class. | |||
5451 | const RecordType *RT = Base.getType()->getAs<RecordType>(); | |||
5452 | ||||
5453 | // Remember direct virtual bases. | |||
5454 | if (Base.isVirtual()) { | |||
5455 | if (!VisitVirtualBases) | |||
5456 | continue; | |||
5457 | DirectVirtualBases.insert(RT); | |||
5458 | } | |||
5459 | ||||
5460 | CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); | |||
| ||||
5461 | // If our base class is invalid, we probably can't get its dtor anyway. | |||
5462 | if (BaseClassDecl->isInvalidDecl()) | |||
5463 | continue; | |||
5464 | if (BaseClassDecl->hasIrrelevantDestructor()) | |||
5465 | continue; | |||
5466 | ||||
5467 | CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); | |||
5468 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 5468, __PRETTY_FUNCTION__)); | |||
5469 | ||||
5470 | // FIXME: caret should be on the start of the class name | |||
5471 | CheckDestructorAccess(Base.getBeginLoc(), Dtor, | |||
5472 | PDiag(diag::err_access_dtor_base) | |||
5473 | << Base.getType() << Base.getSourceRange(), | |||
5474 | Context.getTypeDeclType(ClassDecl)); | |||
5475 | ||||
5476 | MarkFunctionReferenced(Location, Dtor); | |||
5477 | DiagnoseUseOfDecl(Dtor, Location); | |||
5478 | } | |||
5479 | ||||
5480 | if (!VisitVirtualBases) | |||
5481 | return; | |||
5482 | ||||
5483 | // Virtual bases. | |||
5484 | for (const auto &VBase : ClassDecl->vbases()) { | |||
5485 | // Bases are always records in a well-formed non-dependent class. | |||
5486 | const RecordType *RT = VBase.getType()->castAs<RecordType>(); | |||
5487 | ||||
5488 | // Ignore direct virtual bases. | |||
5489 | if (DirectVirtualBases.count(RT)) | |||
5490 | continue; | |||
5491 | ||||
5492 | CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); | |||
5493 | // If our base class is invalid, we probably can't get its dtor anyway. | |||
5494 | if (BaseClassDecl->isInvalidDecl()) | |||
5495 | continue; | |||
5496 | if (BaseClassDecl->hasIrrelevantDestructor()) | |||
5497 | continue; | |||
5498 | ||||
5499 | CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); | |||
5500 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 5500, __PRETTY_FUNCTION__)); | |||
5501 | if (CheckDestructorAccess( | |||
5502 | ClassDecl->getLocation(), Dtor, | |||
5503 | PDiag(diag::err_access_dtor_vbase) | |||
5504 | << Context.getTypeDeclType(ClassDecl) << VBase.getType(), | |||
5505 | Context.getTypeDeclType(ClassDecl)) == | |||
5506 | AR_accessible) { | |||
5507 | CheckDerivedToBaseConversion( | |||
5508 | Context.getTypeDeclType(ClassDecl), VBase.getType(), | |||
5509 | diag::err_access_dtor_vbase, 0, ClassDecl->getLocation(), | |||
5510 | SourceRange(), DeclarationName(), nullptr); | |||
5511 | } | |||
5512 | ||||
5513 | MarkFunctionReferenced(Location, Dtor); | |||
5514 | DiagnoseUseOfDecl(Dtor, Location); | |||
5515 | } | |||
5516 | } | |||
5517 | ||||
5518 | void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { | |||
5519 | if (!CDtorDecl) | |||
5520 | return; | |||
5521 | ||||
5522 | if (CXXConstructorDecl *Constructor | |||
5523 | = dyn_cast<CXXConstructorDecl>(CDtorDecl)) { | |||
5524 | SetCtorInitializers(Constructor, /*AnyErrors=*/false); | |||
5525 | DiagnoseUninitializedFields(*this, Constructor); | |||
5526 | } | |||
5527 | } | |||
5528 | ||||
5529 | bool Sema::isAbstractType(SourceLocation Loc, QualType T) { | |||
5530 | if (!getLangOpts().CPlusPlus) | |||
5531 | return false; | |||
5532 | ||||
5533 | const auto *RD = Context.getBaseElementType(T)->getAsCXXRecordDecl(); | |||
5534 | if (!RD) | |||
5535 | return false; | |||
5536 | ||||
5537 | // FIXME: Per [temp.inst]p1, we are supposed to trigger instantiation of a | |||
5538 | // class template specialization here, but doing so breaks a lot of code. | |||
5539 | ||||
5540 | // We can't answer whether something is abstract until it has a | |||
5541 | // definition. If it's currently being defined, we'll walk back | |||
5542 | // over all the declarations when we have a full definition. | |||
5543 | const CXXRecordDecl *Def = RD->getDefinition(); | |||
5544 | if (!Def || Def->isBeingDefined()) | |||
5545 | return false; | |||
5546 | ||||
5547 | return RD->isAbstract(); | |||
5548 | } | |||
5549 | ||||
5550 | bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, | |||
5551 | TypeDiagnoser &Diagnoser) { | |||
5552 | if (!isAbstractType(Loc, T)) | |||
5553 | return false; | |||
5554 | ||||
5555 | T = Context.getBaseElementType(T); | |||
5556 | Diagnoser.diagnose(*this, Loc, T); | |||
5557 | DiagnoseAbstractType(T->getAsCXXRecordDecl()); | |||
5558 | return true; | |||
5559 | } | |||
5560 | ||||
5561 | void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { | |||
5562 | // Check if we've already emitted the list of pure virtual functions | |||
5563 | // for this class. | |||
5564 | if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) | |||
5565 | return; | |||
5566 | ||||
5567 | // If the diagnostic is suppressed, don't emit the notes. We're only | |||
5568 | // going to emit them once, so try to attach them to a diagnostic we're | |||
5569 | // actually going to show. | |||
5570 | if (Diags.isLastDiagnosticIgnored()) | |||
5571 | return; | |||
5572 | ||||
5573 | CXXFinalOverriderMap FinalOverriders; | |||
5574 | RD->getFinalOverriders(FinalOverriders); | |||
5575 | ||||
5576 | // Keep a set of seen pure methods so we won't diagnose the same method | |||
5577 | // more than once. | |||
5578 | llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; | |||
5579 | ||||
5580 | for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), | |||
5581 | MEnd = FinalOverriders.end(); | |||
5582 | M != MEnd; | |||
5583 | ++M) { | |||
5584 | for (OverridingMethods::iterator SO = M->second.begin(), | |||
5585 | SOEnd = M->second.end(); | |||
5586 | SO != SOEnd; ++SO) { | |||
5587 | // C++ [class.abstract]p4: | |||
5588 | // A class is abstract if it contains or inherits at least one | |||
5589 | // pure virtual function for which the final overrider is pure | |||
5590 | // virtual. | |||
5591 | ||||
5592 | // | |||
5593 | if (SO->second.size() != 1) | |||
5594 | continue; | |||
5595 | ||||
5596 | if (!SO->second.front().Method->isPure()) | |||
5597 | continue; | |||
5598 | ||||
5599 | if (!SeenPureMethods.insert(SO->second.front().Method).second) | |||
5600 | continue; | |||
5601 | ||||
5602 | Diag(SO->second.front().Method->getLocation(), | |||
5603 | diag::note_pure_virtual_function) | |||
5604 | << SO->second.front().Method->getDeclName() << RD->getDeclName(); | |||
5605 | } | |||
5606 | } | |||
5607 | ||||
5608 | if (!PureVirtualClassDiagSet) | |||
5609 | PureVirtualClassDiagSet.reset(new RecordDeclSetTy); | |||
5610 | PureVirtualClassDiagSet->insert(RD); | |||
5611 | } | |||
5612 | ||||
5613 | namespace { | |||
5614 | struct AbstractUsageInfo { | |||
5615 | Sema &S; | |||
5616 | CXXRecordDecl *Record; | |||
5617 | CanQualType AbstractType; | |||
5618 | bool Invalid; | |||
5619 | ||||
5620 | AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) | |||
5621 | : S(S), Record(Record), | |||
5622 | AbstractType(S.Context.getCanonicalType( | |||
5623 | S.Context.getTypeDeclType(Record))), | |||
5624 | Invalid(false) {} | |||
5625 | ||||
5626 | void DiagnoseAbstractType() { | |||
5627 | if (Invalid) return; | |||
5628 | S.DiagnoseAbstractType(Record); | |||
5629 | Invalid = true; | |||
5630 | } | |||
5631 | ||||
5632 | void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); | |||
5633 | }; | |||
5634 | ||||
5635 | struct CheckAbstractUsage { | |||
5636 | AbstractUsageInfo &Info; | |||
5637 | const NamedDecl *Ctx; | |||
5638 | ||||
5639 | CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) | |||
5640 | : Info(Info), Ctx(Ctx) {} | |||
5641 | ||||
5642 | void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { | |||
5643 | switch (TL.getTypeLocClass()) { | |||
5644 | #define ABSTRACT_TYPELOC(CLASS, PARENT) | |||
5645 | #define TYPELOC(CLASS, PARENT) \ | |||
5646 | case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break; | |||
5647 | #include "clang/AST/TypeLocNodes.def" | |||
5648 | } | |||
5649 | } | |||
5650 | ||||
5651 | void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { | |||
5652 | Visit(TL.getReturnLoc(), Sema::AbstractReturnType); | |||
5653 | for (unsigned I = 0, E = TL.getNumParams(); I != E; ++I) { | |||
5654 | if (!TL.getParam(I)) | |||
5655 | continue; | |||
5656 | ||||
5657 | TypeSourceInfo *TSI = TL.getParam(I)->getTypeSourceInfo(); | |||
5658 | if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); | |||
5659 | } | |||
5660 | } | |||
5661 | ||||
5662 | void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { | |||
5663 | Visit(TL.getElementLoc(), Sema::AbstractArrayType); | |||
5664 | } | |||
5665 | ||||
5666 | void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { | |||
5667 | // Visit the type parameters from a permissive context. | |||
5668 | for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { | |||
5669 | TemplateArgumentLoc TAL = TL.getArgLoc(I); | |||
5670 | if (TAL.getArgument().getKind() == TemplateArgument::Type) | |||
5671 | if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) | |||
5672 | Visit(TSI->getTypeLoc(), Sema::AbstractNone); | |||
5673 | // TODO: other template argument types? | |||
5674 | } | |||
5675 | } | |||
5676 | ||||
5677 | // Visit pointee types from a permissive context. | |||
5678 | #define CheckPolymorphic(Type)void Check(Type TL, Sema::AbstractDiagSelID Sel) { Visit(TL.getNextTypeLoc (), Sema::AbstractNone); } \ | |||
5679 | void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ | |||
5680 | Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ | |||
5681 | } | |||
5682 | CheckPolymorphic(PointerTypeLoc)void Check(PointerTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit (TL.getNextTypeLoc(), Sema::AbstractNone); } | |||
5683 | CheckPolymorphic(ReferenceTypeLoc)void Check(ReferenceTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); } | |||
5684 | CheckPolymorphic(MemberPointerTypeLoc)void Check(MemberPointerTypeLoc TL, Sema::AbstractDiagSelID Sel ) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); } | |||
5685 | CheckPolymorphic(BlockPointerTypeLoc)void Check(BlockPointerTypeLoc TL, Sema::AbstractDiagSelID Sel ) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); } | |||
5686 | CheckPolymorphic(AtomicTypeLoc)void Check(AtomicTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit (TL.getNextTypeLoc(), Sema::AbstractNone); } | |||
5687 | ||||
5688 | /// Handle all the types we haven't given a more specific | |||
5689 | /// implementation for above. | |||
5690 | void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { | |||
5691 | // Every other kind of type that we haven't called out already | |||
5692 | // that has an inner type is either (1) sugar or (2) contains that | |||
5693 | // inner type in some way as a subobject. | |||
5694 | if (TypeLoc Next = TL.getNextTypeLoc()) | |||
5695 | return Visit(Next, Sel); | |||
5696 | ||||
5697 | // If there's no inner type and we're in a permissive context, | |||
5698 | // don't diagnose. | |||
5699 | if (Sel == Sema::AbstractNone) return; | |||
5700 | ||||
5701 | // Check whether the type matches the abstract type. | |||
5702 | QualType T = TL.getType(); | |||
5703 | if (T->isArrayType()) { | |||
5704 | Sel = Sema::AbstractArrayType; | |||
5705 | T = Info.S.Context.getBaseElementType(T); | |||
5706 | } | |||
5707 | CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); | |||
5708 | if (CT != Info.AbstractType) return; | |||
5709 | ||||
5710 | // It matched; do some magic. | |||
5711 | if (Sel == Sema::AbstractArrayType) { | |||
5712 | Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) | |||
5713 | << T << TL.getSourceRange(); | |||
5714 | } else { | |||
5715 | Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) | |||
5716 | << Sel << T << TL.getSourceRange(); | |||
5717 | } | |||
5718 | Info.DiagnoseAbstractType(); | |||
5719 | } | |||
5720 | }; | |||
5721 | ||||
5722 | void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, | |||
5723 | Sema::AbstractDiagSelID Sel) { | |||
5724 | CheckAbstractUsage(*this, D).Visit(TL, Sel); | |||
5725 | } | |||
5726 | ||||
5727 | } | |||
5728 | ||||
5729 | /// Check for invalid uses of an abstract type in a method declaration. | |||
5730 | static void CheckAbstractClassUsage(AbstractUsageInfo &Info, | |||
5731 | CXXMethodDecl *MD) { | |||
5732 | // No need to do the check on definitions, which require that | |||
5733 | // the return/param types be complete. | |||
5734 | if (MD->doesThisDeclarationHaveABody()) | |||
5735 | return; | |||
5736 | ||||
5737 | // For safety's sake, just ignore it if we don't have type source | |||
5738 | // information. This should never happen for non-implicit methods, | |||
5739 | // but... | |||
5740 | if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) | |||
5741 | Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); | |||
5742 | } | |||
5743 | ||||
5744 | /// Check for invalid uses of an abstract type within a class definition. | |||
5745 | static void CheckAbstractClassUsage(AbstractUsageInfo &Info, | |||
5746 | CXXRecordDecl *RD) { | |||
5747 | for (auto *D : RD->decls()) { | |||
5748 | if (D->isImplicit()) continue; | |||
5749 | ||||
5750 | // Methods and method templates. | |||
5751 | if (isa<CXXMethodDecl>(D)) { | |||
5752 | CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); | |||
5753 | } else if (isa<FunctionTemplateDecl>(D)) { | |||
5754 | FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); | |||
5755 | CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); | |||
5756 | ||||
5757 | // Fields and static variables. | |||
5758 | } else if (isa<FieldDecl>(D)) { | |||
5759 | FieldDecl *FD = cast<FieldDecl>(D); | |||
5760 | if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) | |||
5761 | Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); | |||
5762 | } else if (isa<VarDecl>(D)) { | |||
5763 | VarDecl *VD = cast<VarDecl>(D); | |||
5764 | if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) | |||
5765 | Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); | |||
5766 | ||||
5767 | // Nested classes and class templates. | |||
5768 | } else if (isa<CXXRecordDecl>(D)) { | |||
5769 | CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); | |||
5770 | } else if (isa<ClassTemplateDecl>(D)) { | |||
5771 | CheckAbstractClassUsage(Info, | |||
5772 | cast<ClassTemplateDecl>(D)->getTemplatedDecl()); | |||
5773 | } | |||
5774 | } | |||
5775 | } | |||
5776 | ||||
5777 | static void ReferenceDllExportedMembers(Sema &S, CXXRecordDecl *Class) { | |||
5778 | Attr *ClassAttr = getDLLAttr(Class); | |||
5779 | if (!ClassAttr) | |||
5780 | return; | |||
5781 | ||||
5782 | assert(ClassAttr->getKind() == attr::DLLExport)((ClassAttr->getKind() == attr::DLLExport) ? static_cast< void> (0) : __assert_fail ("ClassAttr->getKind() == attr::DLLExport" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 5782, __PRETTY_FUNCTION__)); | |||
5783 | ||||
5784 | TemplateSpecializationKind TSK = Class->getTemplateSpecializationKind(); | |||
5785 | ||||
5786 | if (TSK == TSK_ExplicitInstantiationDeclaration) | |||
5787 | // Don't go any further if this is just an explicit instantiation | |||
5788 | // declaration. | |||
5789 | return; | |||
5790 | ||||
5791 | if (S.Context.getTargetInfo().getTriple().isWindowsGNUEnvironment()) | |||
5792 | S.MarkVTableUsed(Class->getLocation(), Class, true); | |||
5793 | ||||
5794 | for (Decl *Member : Class->decls()) { | |||
5795 | // Defined static variables that are members of an exported base | |||
5796 | // class must be marked export too. | |||
5797 | auto *VD = dyn_cast<VarDecl>(Member); | |||
5798 | if (VD && Member->getAttr<DLLExportAttr>() && | |||
5799 | VD->getStorageClass() == SC_Static && | |||
5800 | TSK == TSK_ImplicitInstantiation) | |||
5801 | S.MarkVariableReferenced(VD->getLocation(), VD); | |||
5802 | ||||
5803 | auto *MD = dyn_cast<CXXMethodDecl>(Member); | |||
5804 | if (!MD) | |||
5805 | continue; | |||
5806 | ||||
5807 | if (Member->getAttr<DLLExportAttr>()) { | |||
5808 | if (MD->isUserProvided()) { | |||
5809 | // Instantiate non-default class member functions ... | |||
5810 | ||||
5811 | // .. except for certain kinds of template specializations. | |||
5812 | if (TSK == TSK_ImplicitInstantiation && !ClassAttr->isInherited()) | |||
5813 | continue; | |||
5814 | ||||
5815 | S.MarkFunctionReferenced(Class->getLocation(), MD); | |||
5816 | ||||
5817 | // The function will be passed to the consumer when its definition is | |||
5818 | // encountered. | |||
5819 | } else if (!MD->isTrivial() || MD->isExplicitlyDefaulted() || | |||
5820 | MD->isCopyAssignmentOperator() || | |||
5821 | MD->isMoveAssignmentOperator()) { | |||
5822 | // Synthesize and instantiate non-trivial implicit methods, explicitly | |||
5823 | // defaulted methods, and the copy and move assignment operators. The | |||
5824 | // latter are exported even if they are trivial, because the address of | |||
5825 | // an operator can be taken and should compare equal across libraries. | |||
5826 | DiagnosticErrorTrap Trap(S.Diags); | |||
5827 | S.MarkFunctionReferenced(Class->getLocation(), MD); | |||
5828 | if (Trap.hasErrorOccurred()) { | |||
5829 | S.Diag(ClassAttr->getLocation(), diag::note_due_to_dllexported_class) | |||
5830 | << Class << !S.getLangOpts().CPlusPlus11; | |||
5831 | break; | |||
5832 | } | |||
5833 | ||||
5834 | // There is no later point when we will see the definition of this | |||
5835 | // function, so pass it to the consumer now. | |||
5836 | S.Consumer.HandleTopLevelDecl(DeclGroupRef(MD)); | |||
5837 | } | |||
5838 | } | |||
5839 | } | |||
5840 | } | |||
5841 | ||||
5842 | static void checkForMultipleExportedDefaultConstructors(Sema &S, | |||
5843 | CXXRecordDecl *Class) { | |||
5844 | // Only the MS ABI has default constructor closures, so we don't need to do | |||
5845 | // this semantic checking anywhere else. | |||
5846 | if (!S.Context.getTargetInfo().getCXXABI().isMicrosoft()) | |||
5847 | return; | |||
5848 | ||||
5849 | CXXConstructorDecl *LastExportedDefaultCtor = nullptr; | |||
5850 | for (Decl *Member : Class->decls()) { | |||
5851 | // Look for exported default constructors. | |||
5852 | auto *CD = dyn_cast<CXXConstructorDecl>(Member); | |||
5853 | if (!CD || !CD->isDefaultConstructor()) | |||
5854 | continue; | |||
5855 | auto *Attr = CD->getAttr<DLLExportAttr>(); | |||
5856 | if (!Attr) | |||
5857 | continue; | |||
5858 | ||||
5859 | // If the class is non-dependent, mark the default arguments as ODR-used so | |||
5860 | // that we can properly codegen the constructor closure. | |||
5861 | if (!Class->isDependentContext()) { | |||
5862 | for (ParmVarDecl *PD : CD->parameters()) { | |||
5863 | (void)S.CheckCXXDefaultArgExpr(Attr->getLocation(), CD, PD); | |||
5864 | S.DiscardCleanupsInEvaluationContext(); | |||
5865 | } | |||
5866 | } | |||
5867 | ||||
5868 | if (LastExportedDefaultCtor) { | |||
5869 | S.Diag(LastExportedDefaultCtor->getLocation(), | |||
5870 | diag::err_attribute_dll_ambiguous_default_ctor) | |||
5871 | << Class; | |||
5872 | S.Diag(CD->getLocation(), diag::note_entity_declared_at) | |||
5873 | << CD->getDeclName(); | |||
5874 | return; | |||
5875 | } | |||
5876 | LastExportedDefaultCtor = CD; | |||
5877 | } | |||
5878 | } | |||
5879 | ||||
5880 | void Sema::checkClassLevelCodeSegAttribute(CXXRecordDecl *Class) { | |||
5881 | // Mark any compiler-generated routines with the implicit code_seg attribute. | |||
5882 | for (auto *Method : Class->methods()) { | |||
5883 | if (Method->isUserProvided()) | |||
5884 | continue; | |||
5885 | if (Attr *A = getImplicitCodeSegOrSectionAttrForFunction(Method, /*IsDefinition=*/true)) | |||
5886 | Method->addAttr(A); | |||
5887 | } | |||
5888 | } | |||
5889 | ||||
5890 | /// Check class-level dllimport/dllexport attribute. | |||
5891 | void Sema::checkClassLevelDLLAttribute(CXXRecordDecl *Class) { | |||
5892 | Attr *ClassAttr = getDLLAttr(Class); | |||
5893 | ||||
5894 | // MSVC inherits DLL attributes to partial class template specializations. | |||
5895 | if (Context.getTargetInfo().getCXXABI().isMicrosoft() && !ClassAttr) { | |||
5896 | if (auto *Spec = dyn_cast<ClassTemplatePartialSpecializationDecl>(Class)) { | |||
5897 | if (Attr *TemplateAttr = | |||
5898 | getDLLAttr(Spec->getSpecializedTemplate()->getTemplatedDecl())) { | |||
5899 | auto *A = cast<InheritableAttr>(TemplateAttr->clone(getASTContext())); | |||
5900 | A->setInherited(true); | |||
5901 | ClassAttr = A; | |||
5902 | } | |||
5903 | } | |||
5904 | } | |||
5905 | ||||
5906 | if (!ClassAttr) | |||
5907 | return; | |||
5908 | ||||
5909 | if (!Class->isExternallyVisible()) { | |||
5910 | Diag(Class->getLocation(), diag::err_attribute_dll_not_extern) | |||
5911 | << Class << ClassAttr; | |||
5912 | return; | |||
5913 | } | |||
5914 | ||||
5915 | if (Context.getTargetInfo().getCXXABI().isMicrosoft() && | |||
5916 | !ClassAttr->isInherited()) { | |||
5917 | // Diagnose dll attributes on members of class with dll attribute. | |||
5918 | for (Decl *Member : Class->decls()) { | |||
5919 | if (!isa<VarDecl>(Member) && !isa<CXXMethodDecl>(Member)) | |||
5920 | continue; | |||
5921 | InheritableAttr *MemberAttr = getDLLAttr(Member); | |||
5922 | if (!MemberAttr || MemberAttr->isInherited() || Member->isInvalidDecl()) | |||
5923 | continue; | |||
5924 | ||||
5925 | Diag(MemberAttr->getLocation(), | |||
5926 | diag::err_attribute_dll_member_of_dll_class) | |||
5927 | << MemberAttr << ClassAttr; | |||
5928 | Diag(ClassAttr->getLocation(), diag::note_previous_attribute); | |||
5929 | Member->setInvalidDecl(); | |||
5930 | } | |||
5931 | } | |||
5932 | ||||
5933 | if (Class->getDescribedClassTemplate()) | |||
5934 | // Don't inherit dll attribute until the template is instantiated. | |||
5935 | return; | |||
5936 | ||||
5937 | // The class is either imported or exported. | |||
5938 | const bool ClassExported = ClassAttr->getKind() == attr::DLLExport; | |||
5939 | ||||
5940 | // Check if this was a dllimport attribute propagated from a derived class to | |||
5941 | // a base class template specialization. We don't apply these attributes to | |||
5942 | // static data members. | |||
5943 | const bool PropagatedImport = | |||
5944 | !ClassExported && | |||
5945 | cast<DLLImportAttr>(ClassAttr)->wasPropagatedToBaseTemplate(); | |||
5946 | ||||
5947 | TemplateSpecializationKind TSK = Class->getTemplateSpecializationKind(); | |||
5948 | ||||
5949 | // Ignore explicit dllexport on explicit class template instantiation | |||
5950 | // declarations, except in MinGW mode. | |||
5951 | if (ClassExported && !ClassAttr->isInherited() && | |||
5952 | TSK == TSK_ExplicitInstantiationDeclaration && | |||
5953 | !Context.getTargetInfo().getTriple().isWindowsGNUEnvironment()) { | |||
5954 | Class->dropAttr<DLLExportAttr>(); | |||
5955 | return; | |||
5956 | } | |||
5957 | ||||
5958 | // Force declaration of implicit members so they can inherit the attribute. | |||
5959 | ForceDeclarationOfImplicitMembers(Class); | |||
5960 | ||||
5961 | // FIXME: MSVC's docs say all bases must be exportable, but this doesn't | |||
5962 | // seem to be true in practice? | |||
5963 | ||||
5964 | for (Decl *Member : Class->decls()) { | |||
5965 | VarDecl *VD = dyn_cast<VarDecl>(Member); | |||
5966 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); | |||
5967 | ||||
5968 | // Only methods and static fields inherit the attributes. | |||
5969 | if (!VD && !MD) | |||
5970 | continue; | |||
5971 | ||||
5972 | if (MD) { | |||
5973 | // Don't process deleted methods. | |||
5974 | if (MD->isDeleted()) | |||
5975 | continue; | |||
5976 | ||||
5977 | if (MD->isInlined()) { | |||
5978 | // MinGW does not import or export inline methods. But do it for | |||
5979 | // template instantiations. | |||
5980 | if (!Context.getTargetInfo().getCXXABI().isMicrosoft() && | |||
5981 | !Context.getTargetInfo().getTriple().isWindowsItaniumEnvironment() && | |||
5982 | TSK != TSK_ExplicitInstantiationDeclaration && | |||
5983 | TSK != TSK_ExplicitInstantiationDefinition) | |||
5984 | continue; | |||
5985 | ||||
5986 | // MSVC versions before 2015 don't export the move assignment operators | |||
5987 | // and move constructor, so don't attempt to import/export them if | |||
5988 | // we have a definition. | |||
5989 | auto *Ctor = dyn_cast<CXXConstructorDecl>(MD); | |||
5990 | if ((MD->isMoveAssignmentOperator() || | |||
5991 | (Ctor && Ctor->isMoveConstructor())) && | |||
5992 | !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015)) | |||
5993 | continue; | |||
5994 | ||||
5995 | // MSVC2015 doesn't export trivial defaulted x-tor but copy assign | |||
5996 | // operator is exported anyway. | |||
5997 | if (getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015) && | |||
5998 | (Ctor || isa<CXXDestructorDecl>(MD)) && MD->isTrivial()) | |||
5999 | continue; | |||
6000 | } | |||
6001 | } | |||
6002 | ||||
6003 | // Don't apply dllimport attributes to static data members of class template | |||
6004 | // instantiations when the attribute is propagated from a derived class. | |||
6005 | if (VD && PropagatedImport) | |||
6006 | continue; | |||
6007 | ||||
6008 | if (!cast<NamedDecl>(Member)->isExternallyVisible()) | |||
6009 | continue; | |||
6010 | ||||
6011 | if (!getDLLAttr(Member)) { | |||
6012 | InheritableAttr *NewAttr = nullptr; | |||
6013 | ||||
6014 | // Do not export/import inline function when -fno-dllexport-inlines is | |||
6015 | // passed. But add attribute for later local static var check. | |||
6016 | if (!getLangOpts().DllExportInlines && MD && MD->isInlined() && | |||
6017 | TSK != TSK_ExplicitInstantiationDeclaration && | |||
6018 | TSK != TSK_ExplicitInstantiationDefinition) { | |||
6019 | if (ClassExported) { | |||
6020 | NewAttr = ::new (getASTContext()) | |||
6021 | DLLExportStaticLocalAttr(getASTContext(), *ClassAttr); | |||
6022 | } else { | |||
6023 | NewAttr = ::new (getASTContext()) | |||
6024 | DLLImportStaticLocalAttr(getASTContext(), *ClassAttr); | |||
6025 | } | |||
6026 | } else { | |||
6027 | NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext())); | |||
6028 | } | |||
6029 | ||||
6030 | NewAttr->setInherited(true); | |||
6031 | Member->addAttr(NewAttr); | |||
6032 | ||||
6033 | if (MD) { | |||
6034 | // Propagate DLLAttr to friend re-declarations of MD that have already | |||
6035 | // been constructed. | |||
6036 | for (FunctionDecl *FD = MD->getMostRecentDecl(); FD; | |||
6037 | FD = FD->getPreviousDecl()) { | |||
6038 | if (FD->getFriendObjectKind() == Decl::FOK_None) | |||
6039 | continue; | |||
6040 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 6041, __PRETTY_FUNCTION__)) | |||
6041 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 6041, __PRETTY_FUNCTION__)); | |||
6042 | NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext())); | |||
6043 | NewAttr->setInherited(true); | |||
6044 | FD->addAttr(NewAttr); | |||
6045 | } | |||
6046 | } | |||
6047 | } | |||
6048 | } | |||
6049 | ||||
6050 | if (ClassExported) | |||
6051 | DelayedDllExportClasses.push_back(Class); | |||
6052 | } | |||
6053 | ||||
6054 | /// Perform propagation of DLL attributes from a derived class to a | |||
6055 | /// templated base class for MS compatibility. | |||
6056 | void Sema::propagateDLLAttrToBaseClassTemplate( | |||
6057 | CXXRecordDecl *Class, Attr *ClassAttr, | |||
6058 | ClassTemplateSpecializationDecl *BaseTemplateSpec, SourceLocation BaseLoc) { | |||
6059 | if (getDLLAttr( | |||
6060 | BaseTemplateSpec->getSpecializedTemplate()->getTemplatedDecl())) { | |||
6061 | // If the base class template has a DLL attribute, don't try to change it. | |||
6062 | return; | |||
6063 | } | |||
6064 | ||||
6065 | auto TSK = BaseTemplateSpec->getSpecializationKind(); | |||
6066 | if (!getDLLAttr(BaseTemplateSpec) && | |||
6067 | (TSK == TSK_Undeclared || TSK == TSK_ExplicitInstantiationDeclaration || | |||
6068 | TSK == TSK_ImplicitInstantiation)) { | |||
6069 | // The template hasn't been instantiated yet (or it has, but only as an | |||
6070 | // explicit instantiation declaration or implicit instantiation, which means | |||
6071 | // we haven't codegenned any members yet), so propagate the attribute. | |||
6072 | auto *NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext())); | |||
6073 | NewAttr->setInherited(true); | |||
6074 | BaseTemplateSpec->addAttr(NewAttr); | |||
6075 | ||||
6076 | // If this was an import, mark that we propagated it from a derived class to | |||
6077 | // a base class template specialization. | |||
6078 | if (auto *ImportAttr = dyn_cast<DLLImportAttr>(NewAttr)) | |||
6079 | ImportAttr->setPropagatedToBaseTemplate(); | |||
6080 | ||||
6081 | // If the template is already instantiated, checkDLLAttributeRedeclaration() | |||
6082 | // needs to be run again to work see the new attribute. Otherwise this will | |||
6083 | // get run whenever the template is instantiated. | |||
6084 | if (TSK != TSK_Undeclared) | |||
6085 | checkClassLevelDLLAttribute(BaseTemplateSpec); | |||
6086 | ||||
6087 | return; | |||
6088 | } | |||
6089 | ||||
6090 | if (getDLLAttr(BaseTemplateSpec)) { | |||
6091 | // The template has already been specialized or instantiated with an | |||
6092 | // attribute, explicitly or through propagation. We should not try to change | |||
6093 | // it. | |||
6094 | return; | |||
6095 | } | |||
6096 | ||||
6097 | // The template was previously instantiated or explicitly specialized without | |||
6098 | // a dll attribute, It's too late for us to add an attribute, so warn that | |||
6099 | // this is unsupported. | |||
6100 | Diag(BaseLoc, diag::warn_attribute_dll_instantiated_base_class) | |||
6101 | << BaseTemplateSpec->isExplicitSpecialization(); | |||
6102 | Diag(ClassAttr->getLocation(), diag::note_attribute); | |||
6103 | if (BaseTemplateSpec->isExplicitSpecialization()) { | |||
6104 | Diag(BaseTemplateSpec->getLocation(), | |||
6105 | diag::note_template_class_explicit_specialization_was_here) | |||
6106 | << BaseTemplateSpec; | |||
6107 | } else { | |||
6108 | Diag(BaseTemplateSpec->getPointOfInstantiation(), | |||
6109 | diag::note_template_class_instantiation_was_here) | |||
6110 | << BaseTemplateSpec; | |||
6111 | } | |||
6112 | } | |||
6113 | ||||
6114 | /// Determine the kind of defaulting that would be done for a given function. | |||
6115 | /// | |||
6116 | /// If the function is both a default constructor and a copy / move constructor | |||
6117 | /// (due to having a default argument for the first parameter), this picks | |||
6118 | /// CXXDefaultConstructor. | |||
6119 | /// | |||
6120 | /// FIXME: Check that case is properly handled by all callers. | |||
6121 | Sema::DefaultedFunctionKind | |||
6122 | Sema::getDefaultedFunctionKind(const FunctionDecl *FD) { | |||
6123 | if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) { | |||
6124 | if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(FD)) { | |||
6125 | if (Ctor->isDefaultConstructor()) | |||
6126 | return Sema::CXXDefaultConstructor; | |||
6127 | ||||
6128 | if (Ctor->isCopyConstructor()) | |||
6129 | return Sema::CXXCopyConstructor; | |||
6130 | ||||
6131 | if (Ctor->isMoveConstructor()) | |||
6132 | return Sema::CXXMoveConstructor; | |||
6133 | } | |||
6134 | ||||
6135 | if (MD->isCopyAssignmentOperator()) | |||
6136 | return Sema::CXXCopyAssignment; | |||
6137 | ||||
6138 | if (MD->isMoveAssignmentOperator()) | |||
6139 | return Sema::CXXMoveAssignment; | |||
6140 | ||||
6141 | if (isa<CXXDestructorDecl>(FD)) | |||
6142 | return Sema::CXXDestructor; | |||
6143 | } | |||
6144 | ||||
6145 | switch (FD->getDeclName().getCXXOverloadedOperator()) { | |||
6146 | case OO_EqualEqual: | |||
6147 | return DefaultedComparisonKind::Equal; | |||
6148 | ||||
6149 | case OO_ExclaimEqual: | |||
6150 | return DefaultedComparisonKind::NotEqual; | |||
6151 | ||||
6152 | case OO_Spaceship: | |||
6153 | // No point allowing this if <=> doesn't exist in the current language mode. | |||
6154 | if (!getLangOpts().CPlusPlus2a) | |||
6155 | break; | |||
6156 | return DefaultedComparisonKind::ThreeWay; | |||
6157 | ||||
6158 | case OO_Less: | |||
6159 | case OO_LessEqual: | |||
6160 | case OO_Greater: | |||
6161 | case OO_GreaterEqual: | |||
6162 | // No point allowing this if <=> doesn't exist in the current language mode. | |||
6163 | if (!getLangOpts().CPlusPlus2a) | |||
6164 | break; | |||
6165 | return DefaultedComparisonKind::Relational; | |||
6166 | ||||
6167 | default: | |||
6168 | break; | |||
6169 | } | |||
6170 | ||||
6171 | // Not defaultable. | |||
6172 | return DefaultedFunctionKind(); | |||
6173 | } | |||
6174 | ||||
6175 | static void DefineImplicitSpecialMember(Sema &S, CXXMethodDecl *MD, | |||
6176 | SourceLocation DefaultLoc) { | |||
6177 | switch (S.getSpecialMember(MD)) { | |||
6178 | case Sema::CXXDefaultConstructor: | |||
6179 | S.DefineImplicitDefaultConstructor(DefaultLoc, | |||
6180 | cast<CXXConstructorDecl>(MD)); | |||
6181 | break; | |||
6182 | case Sema::CXXCopyConstructor: | |||
6183 | S.DefineImplicitCopyConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD)); | |||
6184 | break; | |||
6185 | case Sema::CXXCopyAssignment: | |||
6186 | S.DefineImplicitCopyAssignment(DefaultLoc, MD); | |||
6187 | break; | |||
6188 | case Sema::CXXDestructor: | |||
6189 | S.DefineImplicitDestructor(DefaultLoc, cast<CXXDestructorDecl>(MD)); | |||
6190 | break; | |||
6191 | case Sema::CXXMoveConstructor: | |||
6192 | S.DefineImplicitMoveConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD)); | |||
6193 | break; | |||
6194 | case Sema::CXXMoveAssignment: | |||
6195 | S.DefineImplicitMoveAssignment(DefaultLoc, MD); | |||
6196 | break; | |||
6197 | case Sema::CXXInvalid: | |||
6198 | llvm_unreachable("Invalid special member.")::llvm::llvm_unreachable_internal("Invalid special member.", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 6198); | |||
6199 | } | |||
6200 | } | |||
6201 | ||||
6202 | /// Determine whether a type is permitted to be passed or returned in | |||
6203 | /// registers, per C++ [class.temporary]p3. | |||
6204 | static bool canPassInRegisters(Sema &S, CXXRecordDecl *D, | |||
6205 | TargetInfo::CallingConvKind CCK) { | |||
6206 | if (D->isDependentType() || D->isInvalidDecl()) | |||
6207 | return false; | |||
6208 | ||||
6209 | // Clang <= 4 used the pre-C++11 rule, which ignores move operations. | |||
6210 | // The PS4 platform ABI follows the behavior of Clang 3.2. | |||
6211 | if (CCK == TargetInfo::CCK_ClangABI4OrPS4) | |||
6212 | return !D->hasNonTrivialDestructorForCall() && | |||
6213 | !D->hasNonTrivialCopyConstructorForCall(); | |||
6214 | ||||
6215 | if (CCK == TargetInfo::CCK_MicrosoftWin64) { | |||
6216 | bool CopyCtorIsTrivial = false, CopyCtorIsTrivialForCall = false; | |||
6217 | bool DtorIsTrivialForCall = false; | |||
6218 | ||||
6219 | // If a class has at least one non-deleted, trivial copy constructor, it | |||
6220 | // is passed according to the C ABI. Otherwise, it is passed indirectly. | |||
6221 | // | |||
6222 | // Note: This permits classes with non-trivial copy or move ctors to be | |||
6223 | // passed in registers, so long as they *also* have a trivial copy ctor, | |||
6224 | // which is non-conforming. | |||
6225 | if (D->needsImplicitCopyConstructor()) { | |||
6226 | if (!D->defaultedCopyConstructorIsDeleted()) { | |||
6227 | if (D->hasTrivialCopyConstructor()) | |||
6228 | CopyCtorIsTrivial = true; | |||
6229 | if (D->hasTrivialCopyConstructorForCall()) | |||
6230 | CopyCtorIsTrivialForCall = true; | |||
6231 | } | |||
6232 | } else { | |||
6233 | for (const CXXConstructorDecl *CD : D->ctors()) { | |||
6234 | if (CD->isCopyConstructor() && !CD->isDeleted()) { | |||
6235 | if (CD->isTrivial()) | |||
6236 | CopyCtorIsTrivial = true; | |||
6237 | if (CD->isTrivialForCall()) | |||
6238 | CopyCtorIsTrivialForCall = true; | |||
6239 | } | |||
6240 | } | |||
6241 | } | |||
6242 | ||||
6243 | if (D->needsImplicitDestructor()) { | |||
6244 | if (!D->defaultedDestructorIsDeleted() && | |||
6245 | D->hasTrivialDestructorForCall()) | |||
6246 | DtorIsTrivialForCall = true; | |||
6247 | } else if (const auto *DD = D->getDestructor()) { | |||
6248 | if (!DD->isDeleted() && DD->isTrivialForCall()) | |||
6249 | DtorIsTrivialForCall = true; | |||
6250 | } | |||
6251 | ||||
6252 | // If the copy ctor and dtor are both trivial-for-calls, pass direct. | |||
6253 | if (CopyCtorIsTrivialForCall && DtorIsTrivialForCall) | |||
6254 | return true; | |||
6255 | ||||
6256 | // If a class has a destructor, we'd really like to pass it indirectly | |||
6257 | // because it allows us to elide copies. Unfortunately, MSVC makes that | |||
6258 | // impossible for small types, which it will pass in a single register or | |||
6259 | // stack slot. Most objects with dtors are large-ish, so handle that early. | |||
6260 | // We can't call out all large objects as being indirect because there are | |||
6261 | // multiple x64 calling conventions and the C++ ABI code shouldn't dictate | |||
6262 | // how we pass large POD types. | |||
6263 | ||||
6264 | // Note: This permits small classes with nontrivial destructors to be | |||
6265 | // passed in registers, which is non-conforming. | |||
6266 | bool isAArch64 = S.Context.getTargetInfo().getTriple().isAArch64(); | |||
6267 | uint64_t TypeSize = isAArch64 ? 128 : 64; | |||
6268 | ||||
6269 | if (CopyCtorIsTrivial && | |||
6270 | S.getASTContext().getTypeSize(D->getTypeForDecl()) <= TypeSize) | |||
6271 | return true; | |||
6272 | return false; | |||
6273 | } | |||
6274 | ||||
6275 | // Per C++ [class.temporary]p3, the relevant condition is: | |||
6276 | // each copy constructor, move constructor, and destructor of X is | |||
6277 | // either trivial or deleted, and X has at least one non-deleted copy | |||
6278 | // or move constructor | |||
6279 | bool HasNonDeletedCopyOrMove = false; | |||
6280 | ||||
6281 | if (D->needsImplicitCopyConstructor() && | |||
6282 | !D->defaultedCopyConstructorIsDeleted()) { | |||
6283 | if (!D->hasTrivialCopyConstructorForCall()) | |||
6284 | return false; | |||
6285 | HasNonDeletedCopyOrMove = true; | |||
6286 | } | |||
6287 | ||||
6288 | if (S.getLangOpts().CPlusPlus11 && D->needsImplicitMoveConstructor() && | |||
6289 | !D->defaultedMoveConstructorIsDeleted()) { | |||
6290 | if (!D->hasTrivialMoveConstructorForCall()) | |||
6291 | return false; | |||
6292 | HasNonDeletedCopyOrMove = true; | |||
6293 | } | |||
6294 | ||||
6295 | if (D->needsImplicitDestructor() && !D->defaultedDestructorIsDeleted() && | |||
6296 | !D->hasTrivialDestructorForCall()) | |||
6297 | return false; | |||
6298 | ||||
6299 | for (const CXXMethodDecl *MD : D->methods()) { | |||
6300 | if (MD->isDeleted()) | |||
6301 | continue; | |||
6302 | ||||
6303 | auto *CD = dyn_cast<CXXConstructorDecl>(MD); | |||
6304 | if (CD && CD->isCopyOrMoveConstructor()) | |||
6305 | HasNonDeletedCopyOrMove = true; | |||
6306 | else if (!isa<CXXDestructorDecl>(MD)) | |||
6307 | continue; | |||
6308 | ||||
6309 | if (!MD->isTrivialForCall()) | |||
6310 | return false; | |||
6311 | } | |||
6312 | ||||
6313 | return HasNonDeletedCopyOrMove; | |||
6314 | } | |||
6315 | ||||
6316 | /// Perform semantic checks on a class definition that has been | |||
6317 | /// completing, introducing implicitly-declared members, checking for | |||
6318 | /// abstract types, etc. | |||
6319 | /// | |||
6320 | /// \param S The scope in which the class was parsed. Null if we didn't just | |||
6321 | /// parse a class definition. | |||
6322 | /// \param Record The completed class. | |||
6323 | void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { | |||
6324 | if (!Record) | |||
6325 | return; | |||
6326 | ||||
6327 | if (Record->isAbstract() && !Record->isInvalidDecl()) { | |||
6328 | AbstractUsageInfo Info(*this, Record); | |||
6329 | CheckAbstractClassUsage(Info, Record); | |||
6330 | } | |||
6331 | ||||
6332 | // If this is not an aggregate type and has no user-declared constructor, | |||
6333 | // complain about any non-static data members of reference or const scalar | |||
6334 | // type, since they will never get initializers. | |||
6335 | if (!Record->isInvalidDecl() && !Record->isDependentType() && | |||
6336 | !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && | |||
6337 | !Record->isLambda()) { | |||
6338 | bool Complained = false; | |||
6339 | for (const auto *F : Record->fields()) { | |||
6340 | if (F->hasInClassInitializer() || F->isUnnamedBitfield()) | |||
6341 | continue; | |||
6342 | ||||
6343 | if (F->getType()->isReferenceType() || | |||
6344 | (F->getType().isConstQualified() && F->getType()->isScalarType())) { | |||
6345 | if (!Complained) { | |||
6346 | Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) | |||
6347 | << Record->getTagKind() << Record; | |||
6348 | Complained = true; | |||
6349 | } | |||
6350 | ||||
6351 | Diag(F->getLocation(), diag::note_refconst_member_not_initialized) | |||
6352 | << F->getType()->isReferenceType() | |||
6353 | << F->getDeclName(); | |||
6354 | } | |||
6355 | } | |||
6356 | } | |||
6357 | ||||
6358 | if (Record->getIdentifier()) { | |||
6359 | // C++ [class.mem]p13: | |||
6360 | // If T is the name of a class, then each of the following shall have a | |||
6361 | // name different from T: | |||
6362 | // - every member of every anonymous union that is a member of class T. | |||
6363 | // | |||
6364 | // C++ [class.mem]p14: | |||
6365 | // In addition, if class T has a user-declared constructor (12.1), every | |||
6366 | // non-static data member of class T shall have a name different from T. | |||
6367 | DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); | |||
6368 | for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; | |||
6369 | ++I) { | |||
6370 | NamedDecl *D = (*I)->getUnderlyingDecl(); | |||
6371 | if (((isa<FieldDecl>(D) || isa<UnresolvedUsingValueDecl>(D)) && | |||
6372 | Record->hasUserDeclaredConstructor()) || | |||
6373 | isa<IndirectFieldDecl>(D)) { | |||
6374 | Diag((*I)->getLocation(), diag::err_member_name_of_class) | |||
6375 | << D->getDeclName(); | |||
6376 | break; | |||
6377 | } | |||
6378 | } | |||
6379 | } | |||
6380 | ||||
6381 | // Warn if the class has virtual methods but non-virtual public destructor. | |||
6382 | if (Record->isPolymorphic() && !Record->isDependentType()) { | |||
6383 | CXXDestructorDecl *dtor = Record->getDestructor(); | |||
6384 | if ((!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) && | |||
6385 | !Record->hasAttr<FinalAttr>()) | |||
6386 | Diag(dtor ? dtor->getLocation() : Record->getLocation(), | |||
6387 | diag::warn_non_virtual_dtor) << Context.getRecordType(Record); | |||
6388 | } | |||
6389 | ||||
6390 | if (Record->isAbstract()) { | |||
6391 | if (FinalAttr *FA = Record->getAttr<FinalAttr>()) { | |||
6392 | Diag(Record->getLocation(), diag::warn_abstract_final_class) | |||
6393 | << FA->isSpelledAsSealed(); | |||
6394 | DiagnoseAbstractType(Record); | |||
6395 | } | |||
6396 | } | |||
6397 | ||||
6398 | // Warn if the class has a final destructor but is not itself marked final. | |||
6399 | if (!Record->hasAttr<FinalAttr>()) { | |||
6400 | if (const CXXDestructorDecl *dtor = Record->getDestructor()) { | |||
6401 | if (const FinalAttr *FA = dtor->getAttr<FinalAttr>()) { | |||
6402 | Diag(FA->getLocation(), diag::warn_final_dtor_non_final_class) | |||
6403 | << FA->isSpelledAsSealed() | |||
6404 | << FixItHint::CreateInsertion( | |||
6405 | getLocForEndOfToken(Record->getLocation()), | |||
6406 | (FA->isSpelledAsSealed() ? " sealed" : " final")); | |||
6407 | Diag(Record->getLocation(), | |||
6408 | diag::note_final_dtor_non_final_class_silence) | |||
6409 | << Context.getRecordType(Record) << FA->isSpelledAsSealed(); | |||
6410 | } | |||
6411 | } | |||
6412 | } | |||
6413 | ||||
6414 | // See if trivial_abi has to be dropped. | |||
6415 | if (Record->hasAttr<TrivialABIAttr>()) | |||
6416 | checkIllFormedTrivialABIStruct(*Record); | |||
6417 | ||||
6418 | // Set HasTrivialSpecialMemberForCall if the record has attribute | |||
6419 | // "trivial_abi". | |||
6420 | bool HasTrivialABI = Record->hasAttr<TrivialABIAttr>(); | |||
6421 | ||||
6422 | if (HasTrivialABI) | |||
6423 | Record->setHasTrivialSpecialMemberForCall(); | |||
6424 | ||||
6425 | // Explicitly-defaulted secondary comparison functions (!=, <, <=, >, >=). | |||
6426 | // We check these last because they can depend on the properties of the | |||
6427 | // primary comparison functions (==, <=>). | |||
6428 | llvm::SmallVector<FunctionDecl*, 5> DefaultedSecondaryComparisons; | |||
6429 | ||||
6430 | auto CheckForDefaultedFunction = [&](FunctionDecl *FD) { | |||
6431 | if (!FD || FD->isInvalidDecl() || !FD->isExplicitlyDefaulted()) | |||
6432 | return; | |||
6433 | ||||
6434 | DefaultedFunctionKind DFK = getDefaultedFunctionKind(FD); | |||
6435 | if (DFK.asComparison() == DefaultedComparisonKind::NotEqual || | |||
6436 | DFK.asComparison() == DefaultedComparisonKind::Relational) | |||
6437 | DefaultedSecondaryComparisons.push_back(FD); | |||
6438 | else | |||
6439 | CheckExplicitlyDefaultedFunction(S, FD); | |||
6440 | }; | |||
6441 | ||||
6442 | auto CompleteMemberFunction = [&](CXXMethodDecl *M) { | |||
6443 | // Check whether the explicitly-defaulted members are valid. | |||
6444 | CheckForDefaultedFunction(M); | |||
6445 | ||||
6446 | // Skip the rest of the checks for a member of a dependent class. | |||
6447 | if (Record->isDependentType()) | |||
6448 | return; | |||
6449 | ||||
6450 | // For an explicitly defaulted or deleted special member, we defer | |||
6451 | // determining triviality until the class is complete. That time is now! | |||
6452 | CXXSpecialMember CSM = getSpecialMember(M); | |||
6453 | if (!M->isImplicit() && !M->isUserProvided()) { | |||
6454 | if (CSM != CXXInvalid) { | |||
6455 | M->setTrivial(SpecialMemberIsTrivial(M, CSM)); | |||
6456 | // Inform the class that we've finished declaring this member. | |||
6457 | Record->finishedDefaultedOrDeletedMember(M); | |||
6458 | M->setTrivialForCall( | |||
6459 | HasTrivialABI || | |||
6460 | SpecialMemberIsTrivial(M, CSM, TAH_ConsiderTrivialABI)); | |||
6461 | Record->setTrivialForCallFlags(M); | |||
6462 | } | |||
6463 | } | |||
6464 | ||||
6465 | // Set triviality for the purpose of calls if this is a user-provided | |||
6466 | // copy/move constructor or destructor. | |||
6467 | if ((CSM == CXXCopyConstructor || CSM == CXXMoveConstructor || | |||
6468 | CSM == CXXDestructor) && M->isUserProvided()) { | |||
6469 | M->setTrivialForCall(HasTrivialABI); | |||
6470 | Record->setTrivialForCallFlags(M); | |||
6471 | } | |||
6472 | ||||
6473 | if (!M->isInvalidDecl() && M->isExplicitlyDefaulted() && | |||
6474 | M->hasAttr<DLLExportAttr>()) { | |||
6475 | if (getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015) && | |||
6476 | M->isTrivial() && | |||
6477 | (CSM == CXXDefaultConstructor || CSM == CXXCopyConstructor || | |||
6478 | CSM == CXXDestructor)) | |||
6479 | M->dropAttr<DLLExportAttr>(); | |||
6480 | ||||
6481 | if (M->hasAttr<DLLExportAttr>()) { | |||
6482 | // Define after any fields with in-class initializers have been parsed. | |||
6483 | DelayedDllExportMemberFunctions.push_back(M); | |||
6484 | } | |||
6485 | } | |||
6486 | ||||
6487 | // Define defaulted constexpr virtual functions that override a base class | |||
6488 | // function right away. | |||
6489 | // FIXME: We can defer doing this until the vtable is marked as used. | |||
6490 | if (M->isDefaulted() && M->isConstexpr() && M->size_overridden_methods()) | |||
6491 | DefineImplicitSpecialMember(*this, M, M->getLocation()); | |||
6492 | }; | |||
6493 | ||||
6494 | // Check the destructor before any other member function. We need to | |||
6495 | // determine whether it's trivial in order to determine whether the claas | |||
6496 | // type is a literal type, which is a prerequisite for determining whether | |||
6497 | // other special member functions are valid and whether they're implicitly | |||
6498 | // 'constexpr'. | |||
6499 | if (CXXDestructorDecl *Dtor = Record->getDestructor()) | |||
6500 | CompleteMemberFunction(Dtor); | |||
6501 | ||||
6502 | bool HasMethodWithOverrideControl = false, | |||
6503 | HasOverridingMethodWithoutOverrideControl = false; | |||
6504 | for (auto *D : Record->decls()) { | |||
6505 | if (auto *M = dyn_cast<CXXMethodDecl>(D)) { | |||
6506 | // FIXME: We could do this check for dependent types with non-dependent | |||
6507 | // bases. | |||
6508 | if (!Record->isDependentType()) { | |||
6509 | // See if a method overloads virtual methods in a base | |||
6510 | // class without overriding any. | |||
6511 | if (!M->isStatic()) | |||
6512 | DiagnoseHiddenVirtualMethods(M); | |||
6513 | if (M->hasAttr<OverrideAttr>()) | |||
6514 | HasMethodWithOverrideControl = true; | |||
6515 | else if (M->size_overridden_methods() > 0) | |||
6516 | HasOverridingMethodWithoutOverrideControl = true; | |||
6517 | } | |||
6518 | ||||
6519 | if (!isa<CXXDestructorDecl>(M)) | |||
6520 | CompleteMemberFunction(M); | |||
6521 | } else if (auto *F = dyn_cast<FriendDecl>(D)) { | |||
6522 | CheckForDefaultedFunction( | |||
6523 | dyn_cast_or_null<FunctionDecl>(F->getFriendDecl())); | |||
6524 | } | |||
6525 | } | |||
6526 | ||||
6527 | if (HasMethodWithOverrideControl && | |||
6528 | HasOverridingMethodWithoutOverrideControl) { | |||
6529 | // At least one method has the 'override' control declared. | |||
6530 | // Diagnose all other overridden methods which do not have 'override' | |||
6531 | // specified on them. | |||
6532 | for (auto *M : Record->methods()) | |||
6533 | DiagnoseAbsenceOfOverrideControl(M); | |||
6534 | } | |||
6535 | ||||
6536 | // Check the defaulted secondary comparisons after any other member functions. | |||
6537 | for (FunctionDecl *FD : DefaultedSecondaryComparisons) | |||
6538 | CheckExplicitlyDefaultedFunction(S, FD); | |||
6539 | ||||
6540 | // ms_struct is a request to use the same ABI rules as MSVC. Check | |||
6541 | // whether this class uses any C++ features that are implemented | |||
6542 | // completely differently in MSVC, and if so, emit a diagnostic. | |||
6543 | // That diagnostic defaults to an error, but we allow projects to | |||
6544 | // map it down to a warning (or ignore it). It's a fairly common | |||
6545 | // practice among users of the ms_struct pragma to mass-annotate | |||
6546 | // headers, sweeping up a bunch of types that the project doesn't | |||
6547 | // really rely on MSVC-compatible layout for. We must therefore | |||
6548 | // support "ms_struct except for C++ stuff" as a secondary ABI. | |||
6549 | if (Record->isMsStruct(Context) && | |||
6550 | (Record->isPolymorphic() || Record->getNumBases())) { | |||
6551 | Diag(Record->getLocation(), diag::warn_cxx_ms_struct); | |||
6552 | } | |||
6553 | ||||
6554 | checkClassLevelDLLAttribute(Record); | |||
6555 | checkClassLevelCodeSegAttribute(Record); | |||
6556 | ||||
6557 | bool ClangABICompat4 = | |||
6558 | Context.getLangOpts().getClangABICompat() <= LangOptions::ClangABI::Ver4; | |||
6559 | TargetInfo::CallingConvKind CCK = | |||
6560 | Context.getTargetInfo().getCallingConvKind(ClangABICompat4); | |||
6561 | bool CanPass = canPassInRegisters(*this, Record, CCK); | |||
6562 | ||||
6563 | // Do not change ArgPassingRestrictions if it has already been set to | |||
6564 | // APK_CanNeverPassInRegs. | |||
6565 | if (Record->getArgPassingRestrictions() != RecordDecl::APK_CanNeverPassInRegs) | |||
6566 | Record->setArgPassingRestrictions(CanPass | |||
6567 | ? RecordDecl::APK_CanPassInRegs | |||
6568 | : RecordDecl::APK_CannotPassInRegs); | |||
6569 | ||||
6570 | // If canPassInRegisters returns true despite the record having a non-trivial | |||
6571 | // destructor, the record is destructed in the callee. This happens only when | |||
6572 | // the record or one of its subobjects has a field annotated with trivial_abi | |||
6573 | // or a field qualified with ObjC __strong/__weak. | |||
6574 | if (Context.getTargetInfo().getCXXABI().areArgsDestroyedLeftToRightInCallee()) | |||
6575 | Record->setParamDestroyedInCallee(true); | |||
6576 | else if (Record->hasNonTrivialDestructor()) | |||
6577 | Record->setParamDestroyedInCallee(CanPass); | |||
6578 | ||||
6579 | if (getLangOpts().ForceEmitVTables) { | |||
6580 | // If we want to emit all the vtables, we need to mark it as used. This | |||
6581 | // is especially required for cases like vtable assumption loads. | |||
6582 | MarkVTableUsed(Record->getInnerLocStart(), Record); | |||
6583 | } | |||
6584 | } | |||
6585 | ||||
6586 | /// Look up the special member function that would be called by a special | |||
6587 | /// member function for a subobject of class type. | |||
6588 | /// | |||
6589 | /// \param Class The class type of the subobject. | |||
6590 | /// \param CSM The kind of special member function. | |||
6591 | /// \param FieldQuals If the subobject is a field, its cv-qualifiers. | |||
6592 | /// \param ConstRHS True if this is a copy operation with a const object | |||
6593 | /// on its RHS, that is, if the argument to the outer special member | |||
6594 | /// function is 'const' and this is not a field marked 'mutable'. | |||
6595 | static Sema::SpecialMemberOverloadResult lookupCallFromSpecialMember( | |||
6596 | Sema &S, CXXRecordDecl *Class, Sema::CXXSpecialMember CSM, | |||
6597 | unsigned FieldQuals, bool ConstRHS) { | |||
6598 | unsigned LHSQuals = 0; | |||
6599 | if (CSM == Sema::CXXCopyAssignment || CSM == Sema::CXXMoveAssignment) | |||
6600 | LHSQuals = FieldQuals; | |||
6601 | ||||
6602 | unsigned RHSQuals = FieldQuals; | |||
6603 | if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) | |||
6604 | RHSQuals = 0; | |||
6605 | else if (ConstRHS) | |||
6606 | RHSQuals |= Qualifiers::Const; | |||
6607 | ||||
6608 | return S.LookupSpecialMember(Class, CSM, | |||
6609 | RHSQuals & Qualifiers::Const, | |||
6610 | RHSQuals & Qualifiers::Volatile, | |||
6611 | false, | |||
6612 | LHSQuals & Qualifiers::Const, | |||
6613 | LHSQuals & Qualifiers::Volatile); | |||
6614 | } | |||
6615 | ||||
6616 | class Sema::InheritedConstructorInfo { | |||
6617 | Sema &S; | |||
6618 | SourceLocation UseLoc; | |||
6619 | ||||
6620 | /// A mapping from the base classes through which the constructor was | |||
6621 | /// inherited to the using shadow declaration in that base class (or a null | |||
6622 | /// pointer if the constructor was declared in that base class). | |||
6623 | llvm::DenseMap<CXXRecordDecl *, ConstructorUsingShadowDecl *> | |||
6624 | InheritedFromBases; | |||
6625 | ||||
6626 | public: | |||
6627 | InheritedConstructorInfo(Sema &S, SourceLocation UseLoc, | |||
6628 | ConstructorUsingShadowDecl *Shadow) | |||
6629 | : S(S), UseLoc(UseLoc) { | |||
6630 | bool DiagnosedMultipleConstructedBases = false; | |||
6631 | CXXRecordDecl *ConstructedBase = nullptr; | |||
6632 | UsingDecl *ConstructedBaseUsing = nullptr; | |||
6633 | ||||
6634 | // Find the set of such base class subobjects and check that there's a | |||
6635 | // unique constructed subobject. | |||
6636 | for (auto *D : Shadow->redecls()) { | |||
6637 | auto *DShadow = cast<ConstructorUsingShadowDecl>(D); | |||
6638 | auto *DNominatedBase = DShadow->getNominatedBaseClass(); | |||
6639 | auto *DConstructedBase = DShadow->getConstructedBaseClass(); | |||
6640 | ||||
6641 | InheritedFromBases.insert( | |||
6642 | std::make_pair(DNominatedBase->getCanonicalDecl(), | |||
6643 | DShadow->getNominatedBaseClassShadowDecl())); | |||
6644 | if (DShadow->constructsVirtualBase()) | |||
6645 | InheritedFromBases.insert( | |||
6646 | std::make_pair(DConstructedBase->getCanonicalDecl(), | |||
6647 | DShadow->getConstructedBaseClassShadowDecl())); | |||
6648 | else | |||
6649 | assert(DNominatedBase == DConstructedBase)((DNominatedBase == DConstructedBase) ? static_cast<void> (0) : __assert_fail ("DNominatedBase == DConstructedBase", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 6649, __PRETTY_FUNCTION__)); | |||
6650 | ||||
6651 | // [class.inhctor.init]p2: | |||
6652 | // If the constructor was inherited from multiple base class subobjects | |||
6653 | // of type B, the program is ill-formed. | |||
6654 | if (!ConstructedBase) { | |||
6655 | ConstructedBase = DConstructedBase; | |||
6656 | ConstructedBaseUsing = D->getUsingDecl(); | |||
6657 | } else if (ConstructedBase != DConstructedBase && | |||
6658 | !Shadow->isInvalidDecl()) { | |||
6659 | if (!DiagnosedMultipleConstructedBases) { | |||
6660 | S.Diag(UseLoc, diag::err_ambiguous_inherited_constructor) | |||
6661 | << Shadow->getTargetDecl(); | |||
6662 | S.Diag(ConstructedBaseUsing->getLocation(), | |||
6663 | diag::note_ambiguous_inherited_constructor_using) | |||
6664 | << ConstructedBase; | |||
6665 | DiagnosedMultipleConstructedBases = true; | |||
6666 | } | |||
6667 | S.Diag(D->getUsingDecl()->getLocation(), | |||
6668 | diag::note_ambiguous_inherited_constructor_using) | |||
6669 | << DConstructedBase; | |||
6670 | } | |||
6671 | } | |||
6672 | ||||
6673 | if (DiagnosedMultipleConstructedBases) | |||
6674 | Shadow->setInvalidDecl(); | |||
6675 | } | |||
6676 | ||||
6677 | /// Find the constructor to use for inherited construction of a base class, | |||
6678 | /// and whether that base class constructor inherits the constructor from a | |||
6679 | /// virtual base class (in which case it won't actually invoke it). | |||
6680 | std::pair<CXXConstructorDecl *, bool> | |||
6681 | findConstructorForBase(CXXRecordDecl *Base, CXXConstructorDecl *Ctor) const { | |||
6682 | auto It = InheritedFromBases.find(Base->getCanonicalDecl()); | |||
6683 | if (It == InheritedFromBases.end()) | |||
6684 | return std::make_pair(nullptr, false); | |||
6685 | ||||
6686 | // This is an intermediary class. | |||
6687 | if (It->second) | |||
6688 | return std::make_pair( | |||
6689 | S.findInheritingConstructor(UseLoc, Ctor, It->second), | |||
6690 | It->second->constructsVirtualBase()); | |||
6691 | ||||
6692 | // This is the base class from which the constructor was inherited. | |||
6693 | return std::make_pair(Ctor, false); | |||
6694 | } | |||
6695 | }; | |||
6696 | ||||
6697 | /// Is the special member function which would be selected to perform the | |||
6698 | /// specified operation on the specified class type a constexpr constructor? | |||
6699 | static bool | |||
6700 | specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, | |||
6701 | Sema::CXXSpecialMember CSM, unsigned Quals, | |||
6702 | bool ConstRHS, | |||
6703 | CXXConstructorDecl *InheritedCtor = nullptr, | |||
6704 | Sema::InheritedConstructorInfo *Inherited = nullptr) { | |||
6705 | // If we're inheriting a constructor, see if we need to call it for this base | |||
6706 | // class. | |||
6707 | if (InheritedCtor) { | |||
6708 | assert(CSM == Sema::CXXDefaultConstructor)((CSM == Sema::CXXDefaultConstructor) ? static_cast<void> (0) : __assert_fail ("CSM == Sema::CXXDefaultConstructor", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 6708, __PRETTY_FUNCTION__)); | |||
6709 | auto BaseCtor = | |||
6710 | Inherited->findConstructorForBase(ClassDecl, InheritedCtor).first; | |||
6711 | if (BaseCtor) | |||
6712 | return BaseCtor->isConstexpr(); | |||
6713 | } | |||
6714 | ||||
6715 | if (CSM == Sema::CXXDefaultConstructor) | |||
6716 | return ClassDecl->hasConstexprDefaultConstructor(); | |||
6717 | if (CSM == Sema::CXXDestructor) | |||
6718 | return ClassDecl->hasConstexprDestructor(); | |||
6719 | ||||
6720 | Sema::SpecialMemberOverloadResult SMOR = | |||
6721 | lookupCallFromSpecialMember(S, ClassDecl, CSM, Quals, ConstRHS); | |||
6722 | if (!SMOR.getMethod()) | |||
6723 | // A constructor we wouldn't select can't be "involved in initializing" | |||
6724 | // anything. | |||
6725 | return true; | |||
6726 | return SMOR.getMethod()->isConstexpr(); | |||
6727 | } | |||
6728 | ||||
6729 | /// Determine whether the specified special member function would be constexpr | |||
6730 | /// if it were implicitly defined. | |||
6731 | static bool defaultedSpecialMemberIsConstexpr( | |||
6732 | Sema &S, CXXRecordDecl *ClassDecl, Sema::CXXSpecialMember CSM, | |||
6733 | bool ConstArg, CXXConstructorDecl *InheritedCtor = nullptr, | |||
6734 | Sema::InheritedConstructorInfo *Inherited = nullptr) { | |||
6735 | if (!S.getLangOpts().CPlusPlus11) | |||
6736 | return false; | |||
6737 | ||||
6738 | // C++11 [dcl.constexpr]p4: | |||
6739 | // In the definition of a constexpr constructor [...] | |||
6740 | bool Ctor = true; | |||
6741 | switch (CSM) { | |||
6742 | case Sema::CXXDefaultConstructor: | |||
6743 | if (Inherited) | |||
6744 | break; | |||
6745 | // Since default constructor lookup is essentially trivial (and cannot | |||
6746 | // involve, for instance, template instantiation), we compute whether a | |||
6747 | // defaulted default constructor is constexpr directly within CXXRecordDecl. | |||
6748 | // | |||
6749 | // This is important for performance; we need to know whether the default | |||
6750 | // constructor is constexpr to determine whether the type is a literal type. | |||
6751 | return ClassDecl->defaultedDefaultConstructorIsConstexpr(); | |||
6752 | ||||
6753 | case Sema::CXXCopyConstructor: | |||
6754 | case Sema::CXXMoveConstructor: | |||
6755 | // For copy or move constructors, we need to perform overload resolution. | |||
6756 | break; | |||
6757 | ||||
6758 | case Sema::CXXCopyAssignment: | |||
6759 | case Sema::CXXMoveAssignment: | |||
6760 | if (!S.getLangOpts().CPlusPlus14) | |||
6761 | return false; | |||
6762 | // In C++1y, we need to perform overload resolution. | |||
6763 | Ctor = false; | |||
6764 | break; | |||
6765 | ||||
6766 | case Sema::CXXDestructor: | |||
6767 | return ClassDecl->defaultedDestructorIsConstexpr(); | |||
6768 | ||||
6769 | case Sema::CXXInvalid: | |||
6770 | return false; | |||
6771 | } | |||
6772 | ||||
6773 | // -- if the class is a non-empty union, or for each non-empty anonymous | |||
6774 | // union member of a non-union class, exactly one non-static data member | |||
6775 | // shall be initialized; [DR1359] | |||
6776 | // | |||
6777 | // If we squint, this is guaranteed, since exactly one non-static data member | |||
6778 | // will be initialized (if the constructor isn't deleted), we just don't know | |||
6779 | // which one. | |||
6780 | if (Ctor && ClassDecl->isUnion()) | |||
6781 | return CSM == Sema::CXXDefaultConstructor | |||
6782 | ? ClassDecl->hasInClassInitializer() || | |||
6783 | !ClassDecl->hasVariantMembers() | |||
6784 | : true; | |||
6785 | ||||
6786 | // -- the class shall not have any virtual base classes; | |||
6787 | if (Ctor && ClassDecl->getNumVBases()) | |||
6788 | return false; | |||
6789 | ||||
6790 | // C++1y [class.copy]p26: | |||
6791 | // -- [the class] is a literal type, and | |||
6792 | if (!Ctor && !ClassDecl->isLiteral()) | |||
6793 | return false; | |||
6794 | ||||
6795 | // -- every constructor involved in initializing [...] base class | |||
6796 | // sub-objects shall be a constexpr constructor; | |||
6797 | // -- the assignment operator selected to copy/move each direct base | |||
6798 | // class is a constexpr function, and | |||
6799 | for (const auto &B : ClassDecl->bases()) { | |||
6800 | const RecordType *BaseType = B.getType()->getAs<RecordType>(); | |||
6801 | if (!BaseType) continue; | |||
6802 | ||||
6803 | CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); | |||
6804 | if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, 0, ConstArg, | |||
6805 | InheritedCtor, Inherited)) | |||
6806 | return false; | |||
6807 | } | |||
6808 | ||||
6809 | // -- every constructor involved in initializing non-static data members | |||
6810 | // [...] shall be a constexpr constructor; | |||
6811 | // -- every non-static data member and base class sub-object shall be | |||
6812 | // initialized | |||
6813 | // -- for each non-static data member of X that is of class type (or array | |||
6814 | // thereof), the assignment operator selected to copy/move that member is | |||
6815 | // a constexpr function | |||
6816 | for (const auto *F : ClassDecl->fields()) { | |||
6817 | if (F->isInvalidDecl()) | |||
6818 | continue; | |||
6819 | if (CSM == Sema::CXXDefaultConstructor && F->hasInClassInitializer()) | |||
6820 | continue; | |||
6821 | QualType BaseType = S.Context.getBaseElementType(F->getType()); | |||
6822 | if (const RecordType *RecordTy = BaseType->getAs<RecordType>()) { | |||
6823 | CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); | |||
6824 | if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, | |||
6825 | BaseType.getCVRQualifiers(), | |||
6826 | ConstArg && !F->isMutable())) | |||
6827 | return false; | |||
6828 | } else if (CSM == Sema::CXXDefaultConstructor) { | |||
6829 | return false; | |||
6830 | } | |||
6831 | } | |||
6832 | ||||
6833 | // All OK, it's constexpr! | |||
6834 | return true; | |||
6835 | } | |||
6836 | ||||
6837 | namespace { | |||
6838 | /// RAII object to register a defaulted function as having its exception | |||
6839 | /// specification computed. | |||
6840 | struct ComputingExceptionSpec { | |||
6841 | Sema &S; | |||
6842 | ||||
6843 | ComputingExceptionSpec(Sema &S, FunctionDecl *FD, SourceLocation Loc) | |||
6844 | : S(S) { | |||
6845 | Sema::CodeSynthesisContext Ctx; | |||
6846 | Ctx.Kind = Sema::CodeSynthesisContext::ExceptionSpecEvaluation; | |||
6847 | Ctx.PointOfInstantiation = Loc; | |||
6848 | Ctx.Entity = FD; | |||
6849 | S.pushCodeSynthesisContext(Ctx); | |||
6850 | } | |||
6851 | ~ComputingExceptionSpec() { | |||
6852 | S.popCodeSynthesisContext(); | |||
6853 | } | |||
6854 | }; | |||
6855 | } | |||
6856 | ||||
6857 | static Sema::ImplicitExceptionSpecification | |||
6858 | ComputeDefaultedSpecialMemberExceptionSpec( | |||
6859 | Sema &S, SourceLocation Loc, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM, | |||
6860 | Sema::InheritedConstructorInfo *ICI); | |||
6861 | ||||
6862 | static Sema::ImplicitExceptionSpecification | |||
6863 | ComputeDefaultedComparisonExceptionSpec(Sema &S, SourceLocation Loc, | |||
6864 | FunctionDecl *FD, | |||
6865 | Sema::DefaultedComparisonKind DCK); | |||
6866 | ||||
6867 | static Sema::ImplicitExceptionSpecification | |||
6868 | computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, FunctionDecl *FD) { | |||
6869 | auto DFK = S.getDefaultedFunctionKind(FD); | |||
6870 | if (DFK.isSpecialMember()) | |||
6871 | return ComputeDefaultedSpecialMemberExceptionSpec( | |||
6872 | S, Loc, cast<CXXMethodDecl>(FD), DFK.asSpecialMember(), nullptr); | |||
6873 | if (DFK.isComparison()) | |||
6874 | return ComputeDefaultedComparisonExceptionSpec(S, Loc, FD, | |||
6875 | DFK.asComparison()); | |||
6876 | ||||
6877 | auto *CD = cast<CXXConstructorDecl>(FD); | |||
6878 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 6880, __PRETTY_FUNCTION__)) | |||
6879 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 6880, __PRETTY_FUNCTION__)) | |||
6880 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 6880, __PRETTY_FUNCTION__)); | |||
6881 | Sema::InheritedConstructorInfo ICI( | |||
6882 | S, Loc, CD->getInheritedConstructor().getShadowDecl()); | |||
6883 | return ComputeDefaultedSpecialMemberExceptionSpec( | |||
6884 | S, Loc, CD, Sema::CXXDefaultConstructor, &ICI); | |||
6885 | } | |||
6886 | ||||
6887 | static FunctionProtoType::ExtProtoInfo getImplicitMethodEPI(Sema &S, | |||
6888 | CXXMethodDecl *MD) { | |||
6889 | FunctionProtoType::ExtProtoInfo EPI; | |||
6890 | ||||
6891 | // Build an exception specification pointing back at this member. | |||
6892 | EPI.ExceptionSpec.Type = EST_Unevaluated; | |||
6893 | EPI.ExceptionSpec.SourceDecl = MD; | |||
6894 | ||||
6895 | // Set the calling convention to the default for C++ instance methods. | |||
6896 | EPI.ExtInfo = EPI.ExtInfo.withCallingConv( | |||
6897 | S.Context.getDefaultCallingConvention(/*IsVariadic=*/false, | |||
6898 | /*IsCXXMethod=*/true)); | |||
6899 | return EPI; | |||
6900 | } | |||
6901 | ||||
6902 | void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, FunctionDecl *FD) { | |||
6903 | const FunctionProtoType *FPT = FD->getType()->castAs<FunctionProtoType>(); | |||
6904 | if (FPT->getExceptionSpecType() != EST_Unevaluated) | |||
6905 | return; | |||
6906 | ||||
6907 | // Evaluate the exception specification. | |||
6908 | auto IES = computeImplicitExceptionSpec(*this, Loc, FD); | |||
6909 | auto ESI = IES.getExceptionSpec(); | |||
6910 | ||||
6911 | // Update the type of the special member to use it. | |||
6912 | UpdateExceptionSpec(FD, ESI); | |||
6913 | } | |||
6914 | ||||
6915 | void Sema::CheckExplicitlyDefaultedFunction(Scope *S, FunctionDecl *FD) { | |||
6916 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 6916, __PRETTY_FUNCTION__)); | |||
6917 | ||||
6918 | DefaultedFunctionKind DefKind = getDefaultedFunctionKind(FD); | |||
6919 | if (!DefKind) { | |||
6920 | assert(FD->getDeclContext()->isDependentContext())((FD->getDeclContext()->isDependentContext()) ? static_cast <void> (0) : __assert_fail ("FD->getDeclContext()->isDependentContext()" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 6920, __PRETTY_FUNCTION__)); | |||
6921 | return; | |||
6922 | } | |||
6923 | ||||
6924 | if (DefKind.isSpecialMember() | |||
6925 | ? CheckExplicitlyDefaultedSpecialMember(cast<CXXMethodDecl>(FD), | |||
6926 | DefKind.asSpecialMember()) | |||
6927 | : CheckExplicitlyDefaultedComparison(S, FD, DefKind.asComparison())) | |||
6928 | FD->setInvalidDecl(); | |||
6929 | } | |||
6930 | ||||
6931 | bool Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD, | |||
6932 | CXXSpecialMember CSM) { | |||
6933 | CXXRecordDecl *RD = MD->getParent(); | |||
6934 | ||||
6935 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 6936, __PRETTY_FUNCTION__)) | |||
6936 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 6936, __PRETTY_FUNCTION__)); | |||
6937 | ||||
6938 | // Defer all checking for special members of a dependent type. | |||
6939 | if (RD->isDependentType()) | |||
6940 | return false; | |||
6941 | ||||
6942 | // Whether this was the first-declared instance of the constructor. | |||
6943 | // This affects whether we implicitly add an exception spec and constexpr. | |||
6944 | bool First = MD == MD->getCanonicalDecl(); | |||
6945 | ||||
6946 | bool HadError = false; | |||
6947 | ||||
6948 | // C++11 [dcl.fct.def.default]p1: | |||
6949 | // A function that is explicitly defaulted shall | |||
6950 | // -- be a special member function [...] (checked elsewhere), | |||
6951 | // -- have the same type (except for ref-qualifiers, and except that a | |||
6952 | // copy operation can take a non-const reference) as an implicit | |||
6953 | // declaration, and | |||
6954 | // -- not have default arguments. | |||
6955 | // C++2a changes the second bullet to instead delete the function if it's | |||
6956 | // defaulted on its first declaration, unless it's "an assignment operator, | |||
6957 | // and its return type differs or its parameter type is not a reference". | |||
6958 | bool DeleteOnTypeMismatch = getLangOpts().CPlusPlus2a && First; | |||
6959 | bool ShouldDeleteForTypeMismatch = false; | |||
6960 | unsigned ExpectedParams = 1; | |||
6961 | if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) | |||
6962 | ExpectedParams = 0; | |||
6963 | if (MD->getNumParams() != ExpectedParams) { | |||
6964 | // This checks for default arguments: a copy or move constructor with a | |||
6965 | // default argument is classified as a default constructor, and assignment | |||
6966 | // operations and destructors can't have default arguments. | |||
6967 | Diag(MD->getLocation(), diag::err_defaulted_special_member_params) | |||
6968 | << CSM << MD->getSourceRange(); | |||
6969 | HadError = true; | |||
6970 | } else if (MD->isVariadic()) { | |||
6971 | if (DeleteOnTypeMismatch) | |||
6972 | ShouldDeleteForTypeMismatch = true; | |||
6973 | else { | |||
6974 | Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic) | |||
6975 | << CSM << MD->getSourceRange(); | |||
6976 | HadError = true; | |||
6977 | } | |||
6978 | } | |||
6979 | ||||
6980 | const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); | |||
6981 | ||||
6982 | bool CanHaveConstParam = false; | |||
6983 | if (CSM == CXXCopyConstructor) | |||
6984 | CanHaveConstParam = RD->implicitCopyConstructorHasConstParam(); | |||
6985 | else if (CSM == CXXCopyAssignment) | |||
6986 | CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam(); | |||
6987 | ||||
6988 | QualType ReturnType = Context.VoidTy; | |||
6989 | if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { | |||
6990 | // Check for return type matching. | |||
6991 | ReturnType = Type->getReturnType(); | |||
6992 | ||||
6993 | QualType DeclType = Context.getTypeDeclType(RD); | |||
6994 | DeclType = Context.getAddrSpaceQualType(DeclType, MD->getMethodQualifiers().getAddressSpace()); | |||
6995 | QualType ExpectedReturnType = Context.getLValueReferenceType(DeclType); | |||
6996 | ||||
6997 | if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { | |||
6998 | Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) | |||
6999 | << (CSM == CXXMoveAssignment) << ExpectedReturnType; | |||
7000 | HadError = true; | |||
7001 | } | |||
7002 | ||||
7003 | // A defaulted special member cannot have cv-qualifiers. | |||
7004 | if (Type->getMethodQuals().hasConst() || Type->getMethodQuals().hasVolatile()) { | |||
7005 | if (DeleteOnTypeMismatch) | |||
7006 | ShouldDeleteForTypeMismatch = true; | |||
7007 | else { | |||
7008 | Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) | |||
7009 | << (CSM == CXXMoveAssignment) << getLangOpts().CPlusPlus14; | |||
7010 | HadError = true; | |||
7011 | } | |||
7012 | } | |||
7013 | } | |||
7014 | ||||
7015 | // Check for parameter type matching. | |||
7016 | QualType ArgType = ExpectedParams ? Type->getParamType(0) : QualType(); | |||
7017 | bool HasConstParam = false; | |||
7018 | if (ExpectedParams && ArgType->isReferenceType()) { | |||
7019 | // Argument must be reference to possibly-const T. | |||
7020 | QualType ReferentType = ArgType->getPointeeType(); | |||
7021 | HasConstParam = ReferentType.isConstQualified(); | |||
7022 | ||||
7023 | if (ReferentType.isVolatileQualified()) { | |||
7024 | if (DeleteOnTypeMismatch) | |||
7025 | ShouldDeleteForTypeMismatch = true; | |||
7026 | else { | |||
7027 | Diag(MD->getLocation(), | |||
7028 | diag::err_defaulted_special_member_volatile_param) << CSM; | |||
7029 | HadError = true; | |||
7030 | } | |||
7031 | } | |||
7032 | ||||
7033 | if (HasConstParam && !CanHaveConstParam) { | |||
7034 | if (DeleteOnTypeMismatch) | |||
7035 | ShouldDeleteForTypeMismatch = true; | |||
7036 | else if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { | |||
7037 | Diag(MD->getLocation(), | |||
7038 | diag::err_defaulted_special_member_copy_const_param) | |||
7039 | << (CSM == CXXCopyAssignment); | |||
7040 | // FIXME: Explain why this special member can't be const. | |||
7041 | HadError = true; | |||
7042 | } else { | |||
7043 | Diag(MD->getLocation(), | |||
7044 | diag::err_defaulted_special_member_move_const_param) | |||
7045 | << (CSM == CXXMoveAssignment); | |||
7046 | HadError = true; | |||
7047 | } | |||
7048 | } | |||
7049 | } else if (ExpectedParams) { | |||
7050 | // A copy assignment operator can take its argument by value, but a | |||
7051 | // defaulted one cannot. | |||
7052 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 7052, __PRETTY_FUNCTION__)); | |||
7053 | Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); | |||
7054 | HadError = true; | |||
7055 | } | |||
7056 | ||||
7057 | // C++11 [dcl.fct.def.default]p2: | |||
7058 | // An explicitly-defaulted function may be declared constexpr only if it | |||
7059 | // would have been implicitly declared as constexpr, | |||
7060 | // Do not apply this rule to members of class templates, since core issue 1358 | |||
7061 | // makes such functions always instantiate to constexpr functions. For | |||
7062 | // functions which cannot be constexpr (for non-constructors in C++11 and for | |||
7063 | // destructors in C++14 and C++17), this is checked elsewhere. | |||
7064 | // | |||
7065 | // FIXME: This should not apply if the member is deleted. | |||
7066 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, | |||
7067 | HasConstParam); | |||
7068 | if ((getLangOpts().CPlusPlus2a || | |||
7069 | (getLangOpts().CPlusPlus14 ? !isa<CXXDestructorDecl>(MD) | |||
7070 | : isa<CXXConstructorDecl>(MD))) && | |||
7071 | MD->isConstexpr() && !Constexpr && | |||
7072 | MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { | |||
7073 | Diag(MD->getBeginLoc(), MD->isConsteval() | |||
7074 | ? diag::err_incorrect_defaulted_consteval | |||
7075 | : diag::err_incorrect_defaulted_constexpr) | |||
7076 | << CSM; | |||
7077 | // FIXME: Explain why the special member can't be constexpr. | |||
7078 | HadError = true; | |||
7079 | } | |||
7080 | ||||
7081 | if (First) { | |||
7082 | // C++2a [dcl.fct.def.default]p3: | |||
7083 | // If a function is explicitly defaulted on its first declaration, it is | |||
7084 | // implicitly considered to be constexpr if the implicit declaration | |||
7085 | // would be. | |||
7086 | MD->setConstexprKind( | |||
7087 | Constexpr ? (MD->isConsteval() ? CSK_consteval : CSK_constexpr) | |||
7088 | : CSK_unspecified); | |||
7089 | ||||
7090 | if (!Type->hasExceptionSpec()) { | |||
7091 | // C++2a [except.spec]p3: | |||
7092 | // If a declaration of a function does not have a noexcept-specifier | |||
7093 | // [and] is defaulted on its first declaration, [...] the exception | |||
7094 | // specification is as specified below | |||
7095 | FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); | |||
7096 | EPI.ExceptionSpec.Type = EST_Unevaluated; | |||
7097 | EPI.ExceptionSpec.SourceDecl = MD; | |||
7098 | MD->setType(Context.getFunctionType(ReturnType, | |||
7099 | llvm::makeArrayRef(&ArgType, | |||
7100 | ExpectedParams), | |||
7101 | EPI)); | |||
7102 | } | |||
7103 | } | |||
7104 | ||||
7105 | if (ShouldDeleteForTypeMismatch || ShouldDeleteSpecialMember(MD, CSM)) { | |||
7106 | if (First) { | |||
7107 | SetDeclDeleted(MD, MD->getLocation()); | |||
7108 | if (!inTemplateInstantiation() && !HadError) { | |||
7109 | Diag(MD->getLocation(), diag::warn_defaulted_method_deleted) << CSM; | |||
7110 | if (ShouldDeleteForTypeMismatch) { | |||
7111 | Diag(MD->getLocation(), diag::note_deleted_type_mismatch) << CSM; | |||
7112 | } else { | |||
7113 | ShouldDeleteSpecialMember(MD, CSM, nullptr, /*Diagnose*/true); | |||
7114 | } | |||
7115 | } | |||
7116 | if (ShouldDeleteForTypeMismatch && !HadError) { | |||
7117 | Diag(MD->getLocation(), | |||
7118 | diag::warn_cxx17_compat_defaulted_method_type_mismatch) << CSM; | |||
7119 | } | |||
7120 | } else { | |||
7121 | // C++11 [dcl.fct.def.default]p4: | |||
7122 | // [For a] user-provided explicitly-defaulted function [...] if such a | |||
7123 | // function is implicitly defined as deleted, the program is ill-formed. | |||
7124 | Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; | |||
7125 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 7125, __PRETTY_FUNCTION__)); | |||
7126 | ShouldDeleteSpecialMember(MD, CSM, nullptr, /*Diagnose*/true); | |||
7127 | HadError = true; | |||
7128 | } | |||
7129 | } | |||
7130 | ||||
7131 | return HadError; | |||
7132 | } | |||
7133 | ||||
7134 | namespace { | |||
7135 | /// Helper class for building and checking a defaulted comparison. | |||
7136 | /// | |||
7137 | /// Defaulted functions are built in two phases: | |||
7138 | /// | |||
7139 | /// * First, the set of operations that the function will perform are | |||
7140 | /// identified, and some of them are checked. If any of the checked | |||
7141 | /// operations is invalid in certain ways, the comparison function is | |||
7142 | /// defined as deleted and no body is built. | |||
7143 | /// * Then, if the function is not defined as deleted, the body is built. | |||
7144 | /// | |||
7145 | /// This is accomplished by performing two visitation steps over the eventual | |||
7146 | /// body of the function. | |||
7147 | template<typename Derived, typename ResultList, typename Result, | |||
7148 | typename Subobject> | |||
7149 | class DefaultedComparisonVisitor { | |||
7150 | public: | |||
7151 | using DefaultedComparisonKind = Sema::DefaultedComparisonKind; | |||
7152 | ||||
7153 | DefaultedComparisonVisitor(Sema &S, CXXRecordDecl *RD, FunctionDecl *FD, | |||
7154 | DefaultedComparisonKind DCK) | |||
7155 | : S(S), RD(RD), FD(FD), DCK(DCK) { | |||
7156 | if (auto *Info = FD->getDefaultedFunctionInfo()) { | |||
7157 | // FIXME: Change CreateOverloadedBinOp to take an ArrayRef instead of an | |||
7158 | // UnresolvedSet to avoid this copy. | |||
7159 | Fns.assign(Info->getUnqualifiedLookups().begin(), | |||
7160 | Info->getUnqualifiedLookups().end()); | |||
7161 | } | |||
7162 | } | |||
7163 | ||||
7164 | ResultList visit() { | |||
7165 | // The type of an lvalue naming a parameter of this function. | |||
7166 | QualType ParamLvalType = | |||
7167 | FD->getParamDecl(0)->getType().getNonReferenceType(); | |||
7168 | ||||
7169 | ResultList Results; | |||
7170 | ||||
7171 | switch (DCK) { | |||
7172 | case DefaultedComparisonKind::None: | |||
7173 | llvm_unreachable("not a defaulted comparison")::llvm::llvm_unreachable_internal("not a defaulted comparison" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 7173); | |||
7174 | ||||
7175 | case DefaultedComparisonKind::Equal: | |||
7176 | case DefaultedComparisonKind::ThreeWay: | |||
7177 | getDerived().visitSubobjects(Results, RD, ParamLvalType.getQualifiers()); | |||
7178 | return Results; | |||
7179 | ||||
7180 | case DefaultedComparisonKind::NotEqual: | |||
7181 | case DefaultedComparisonKind::Relational: | |||
7182 | Results.add(getDerived().visitExpandedSubobject( | |||
7183 | ParamLvalType, getDerived().getCompleteObject())); | |||
7184 | return Results; | |||
7185 | } | |||
7186 | llvm_unreachable("")::llvm::llvm_unreachable_internal("", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 7186); | |||
7187 | } | |||
7188 | ||||
7189 | protected: | |||
7190 | Derived &getDerived() { return static_cast<Derived&>(*this); } | |||
7191 | ||||
7192 | /// Visit the expanded list of subobjects of the given type, as specified in | |||
7193 | /// C++2a [class.compare.default]. | |||
7194 | /// | |||
7195 | /// \return \c true if the ResultList object said we're done, \c false if not. | |||
7196 | bool visitSubobjects(ResultList &Results, CXXRecordDecl *Record, | |||
7197 | Qualifiers Quals) { | |||
7198 | // C++2a [class.compare.default]p4: | |||
7199 | // The direct base class subobjects of C | |||
7200 | for (CXXBaseSpecifier &Base : Record->bases()) | |||
7201 | if (Results.add(getDerived().visitSubobject( | |||
7202 | S.Context.getQualifiedType(Base.getType(), Quals), | |||
7203 | getDerived().getBase(&Base)))) | |||
7204 | return true; | |||
7205 | ||||
7206 | // followed by the non-static data members of C | |||
7207 | for (FieldDecl *Field : Record->fields()) { | |||
7208 | // Recursively expand anonymous structs. | |||
7209 | if (Field->isAnonymousStructOrUnion()) { | |||
7210 | if (visitSubobjects(Results, Field->getType()->getAsCXXRecordDecl(), | |||
7211 | Quals)) | |||
7212 | return true; | |||
7213 | continue; | |||
7214 | } | |||
7215 | ||||
7216 | // Figure out the type of an lvalue denoting this field. | |||
7217 | Qualifiers FieldQuals = Quals; | |||
7218 | if (Field->isMutable()) | |||
7219 | FieldQuals.removeConst(); | |||
7220 | QualType FieldType = | |||
7221 | S.Context.getQualifiedType(Field->getType(), FieldQuals); | |||
7222 | ||||
7223 | if (Results.add(getDerived().visitSubobject( | |||
7224 | FieldType, getDerived().getField(Field)))) | |||
7225 | return true; | |||
7226 | } | |||
7227 | ||||
7228 | // form a list of subobjects. | |||
7229 | return false; | |||
7230 | } | |||
7231 | ||||
7232 | Result visitSubobject(QualType Type, Subobject Subobj) { | |||
7233 | // In that list, any subobject of array type is recursively expanded | |||
7234 | const ArrayType *AT = S.Context.getAsArrayType(Type); | |||
7235 | if (auto *CAT = dyn_cast_or_null<ConstantArrayType>(AT)) | |||
7236 | return getDerived().visitSubobjectArray(CAT->getElementType(), | |||
7237 | CAT->getSize(), Subobj); | |||
7238 | return getDerived().visitExpandedSubobject(Type, Subobj); | |||
7239 | } | |||
7240 | ||||
7241 | Result visitSubobjectArray(QualType Type, const llvm::APInt &Size, | |||
7242 | Subobject Subobj) { | |||
7243 | return getDerived().visitSubobject(Type, Subobj); | |||
7244 | } | |||
7245 | ||||
7246 | protected: | |||
7247 | Sema &S; | |||
7248 | CXXRecordDecl *RD; | |||
7249 | FunctionDecl *FD; | |||
7250 | DefaultedComparisonKind DCK; | |||
7251 | UnresolvedSet<16> Fns; | |||
7252 | }; | |||
7253 | ||||
7254 | /// Information about a defaulted comparison, as determined by | |||
7255 | /// DefaultedComparisonAnalyzer. | |||
7256 | struct DefaultedComparisonInfo { | |||
7257 | bool Deleted = false; | |||
7258 | bool Constexpr = true; | |||
7259 | ComparisonCategoryType Category = ComparisonCategoryType::StrongOrdering; | |||
7260 | ||||
7261 | static DefaultedComparisonInfo deleted() { | |||
7262 | DefaultedComparisonInfo Deleted; | |||
7263 | Deleted.Deleted = true; | |||
7264 | return Deleted; | |||
7265 | } | |||
7266 | ||||
7267 | bool add(const DefaultedComparisonInfo &R) { | |||
7268 | Deleted |= R.Deleted; | |||
7269 | Constexpr &= R.Constexpr; | |||
7270 | Category = commonComparisonType(Category, R.Category); | |||
7271 | return Deleted; | |||
7272 | } | |||
7273 | }; | |||
7274 | ||||
7275 | /// An element in the expanded list of subobjects of a defaulted comparison, as | |||
7276 | /// specified in C++2a [class.compare.default]p4. | |||
7277 | struct DefaultedComparisonSubobject { | |||
7278 | enum { CompleteObject, Member, Base } Kind; | |||
7279 | NamedDecl *Decl; | |||
7280 | SourceLocation Loc; | |||
7281 | }; | |||
7282 | ||||
7283 | /// A visitor over the notional body of a defaulted comparison that determines | |||
7284 | /// whether that body would be deleted or constexpr. | |||
7285 | class DefaultedComparisonAnalyzer | |||
7286 | : public DefaultedComparisonVisitor<DefaultedComparisonAnalyzer, | |||
7287 | DefaultedComparisonInfo, | |||
7288 | DefaultedComparisonInfo, | |||
7289 | DefaultedComparisonSubobject> { | |||
7290 | public: | |||
7291 | enum DiagnosticKind { NoDiagnostics, ExplainDeleted, ExplainConstexpr }; | |||
7292 | ||||
7293 | private: | |||
7294 | DiagnosticKind Diagnose; | |||
7295 | ||||
7296 | public: | |||
7297 | using Base = DefaultedComparisonVisitor; | |||
7298 | using Result = DefaultedComparisonInfo; | |||
7299 | using Subobject = DefaultedComparisonSubobject; | |||
7300 | ||||
7301 | friend Base; | |||
7302 | ||||
7303 | DefaultedComparisonAnalyzer(Sema &S, CXXRecordDecl *RD, FunctionDecl *FD, | |||
7304 | DefaultedComparisonKind DCK, | |||
7305 | DiagnosticKind Diagnose = NoDiagnostics) | |||
7306 | : Base(S, RD, FD, DCK), Diagnose(Diagnose) {} | |||
7307 | ||||
7308 | Result visit() { | |||
7309 | if ((DCK == DefaultedComparisonKind::Equal || | |||
7310 | DCK == DefaultedComparisonKind::ThreeWay) && | |||
7311 | RD->hasVariantMembers()) { | |||
7312 | // C++2a [class.compare.default]p2 [P2002R0]: | |||
7313 | // A defaulted comparison operator function for class C is defined as | |||
7314 | // deleted if [...] C has variant members. | |||
7315 | if (Diagnose == ExplainDeleted) { | |||
7316 | S.Diag(FD->getLocation(), diag::note_defaulted_comparison_union) | |||
7317 | << FD << RD->isUnion() << RD; | |||
7318 | } | |||
7319 | return Result::deleted(); | |||
7320 | } | |||
7321 | ||||
7322 | return Base::visit(); | |||
7323 | } | |||
7324 | ||||
7325 | private: | |||
7326 | Subobject getCompleteObject() { | |||
7327 | return Subobject{Subobject::CompleteObject, nullptr, FD->getLocation()}; | |||
7328 | } | |||
7329 | ||||
7330 | Subobject getBase(CXXBaseSpecifier *Base) { | |||
7331 | return Subobject{Subobject::Base, Base->getType()->getAsCXXRecordDecl(), | |||
7332 | Base->getBaseTypeLoc()}; | |||
7333 | } | |||
7334 | ||||
7335 | Subobject getField(FieldDecl *Field) { | |||
7336 | return Subobject{Subobject::Member, Field, Field->getLocation()}; | |||
7337 | } | |||
7338 | ||||
7339 | Result visitExpandedSubobject(QualType Type, Subobject Subobj) { | |||
7340 | // C++2a [class.compare.default]p2 [P2002R0]: | |||
7341 | // A defaulted <=> or == operator function for class C is defined as | |||
7342 | // deleted if any non-static data member of C is of reference type | |||
7343 | if (Type->isReferenceType()) { | |||
7344 | if (Diagnose == ExplainDeleted) { | |||
7345 | S.Diag(Subobj.Loc, diag::note_defaulted_comparison_reference_member) | |||
7346 | << FD << RD; | |||
7347 | } | |||
7348 | return Result::deleted(); | |||
7349 | } | |||
7350 | ||||
7351 | // [...] Let xi be an lvalue denoting the ith element [...] | |||
7352 | OpaqueValueExpr Xi(FD->getLocation(), Type, VK_LValue); | |||
7353 | Expr *Args[] = {&Xi, &Xi}; | |||
7354 | ||||
7355 | // All operators start by trying to apply that same operator recursively. | |||
7356 | OverloadedOperatorKind OO = FD->getOverloadedOperator(); | |||
7357 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 7357, __PRETTY_FUNCTION__)); | |||
7358 | return visitBinaryOperator(OO, Args, Subobj); | |||
7359 | } | |||
7360 | ||||
7361 | Result | |||
7362 | visitBinaryOperator(OverloadedOperatorKind OO, ArrayRef<Expr *> Args, | |||
7363 | Subobject Subobj, | |||
7364 | OverloadCandidateSet *SpaceshipCandidates = nullptr) { | |||
7365 | // Note that there is no need to consider rewritten candidates here if | |||
7366 | // we've already found there is no viable 'operator<=>' candidate (and are | |||
7367 | // considering synthesizing a '<=>' from '==' and '<'). | |||
7368 | OverloadCandidateSet CandidateSet( | |||
7369 | FD->getLocation(), OverloadCandidateSet::CSK_Operator, | |||
7370 | OverloadCandidateSet::OperatorRewriteInfo( | |||
7371 | OO, /*AllowRewrittenCandidates=*/!SpaceshipCandidates)); | |||
7372 | ||||
7373 | /// C++2a [class.compare.default]p1 [P2002R0]: | |||
7374 | /// [...] the defaulted function itself is never a candidate for overload | |||
7375 | /// resolution [...] | |||
7376 | CandidateSet.exclude(FD); | |||
7377 | ||||
7378 | if (Args[0]->getType()->isOverloadableType()) | |||
7379 | S.LookupOverloadedBinOp(CandidateSet, OO, Fns, Args); | |||
7380 | else { | |||
7381 | // FIXME: We determine whether this is a valid expression by checking to | |||
7382 | // see if there's a viable builtin operator candidate for it. That isn't | |||
7383 | // really what the rules ask us to do, but should give the right results. | |||
7384 | S.AddBuiltinOperatorCandidates(OO, FD->getLocation(), Args, CandidateSet); | |||
7385 | } | |||
7386 | ||||
7387 | Result R; | |||
7388 | ||||
7389 | OverloadCandidateSet::iterator Best; | |||
7390 | switch (CandidateSet.BestViableFunction(S, FD->getLocation(), Best)) { | |||
7391 | case OR_Success: { | |||
7392 | // C++2a [class.compare.secondary]p2 [P2002R0]: | |||
7393 | // The operator function [...] is defined as deleted if [...] the | |||
7394 | // candidate selected by overload resolution is not a rewritten | |||
7395 | // candidate. | |||
7396 | if ((DCK == DefaultedComparisonKind::NotEqual || | |||
7397 | DCK == DefaultedComparisonKind::Relational) && | |||
7398 | !Best->RewriteKind) { | |||
7399 | if (Diagnose == ExplainDeleted) { | |||
7400 | S.Diag(Best->Function->getLocation(), | |||
7401 | diag::note_defaulted_comparison_not_rewritten_callee) | |||
7402 | << FD; | |||
7403 | } | |||
7404 | return Result::deleted(); | |||
7405 | } | |||
7406 | ||||
7407 | // Throughout C++2a [class.compare]: if overload resolution does not | |||
7408 | // result in a usable function, the candidate function is defined as | |||
7409 | // deleted. This requires that we selected an accessible function. | |||
7410 | // | |||
7411 | // Note that this only considers the access of the function when named | |||
7412 | // within the type of the subobject, and not the access path for any | |||
7413 | // derived-to-base conversion. | |||
7414 | CXXRecordDecl *ArgClass = Args[0]->getType()->getAsCXXRecordDecl(); | |||
7415 | if (ArgClass && Best->FoundDecl.getDecl() && | |||
7416 | Best->FoundDecl.getDecl()->isCXXClassMember()) { | |||
7417 | QualType ObjectType = Subobj.Kind == Subobject::Member | |||
7418 | ? Args[0]->getType() | |||
7419 | : S.Context.getRecordType(RD); | |||
7420 | if (!S.isMemberAccessibleForDeletion( | |||
7421 | ArgClass, Best->FoundDecl, ObjectType, Subobj.Loc, | |||
7422 | Diagnose == ExplainDeleted | |||
7423 | ? S.PDiag(diag::note_defaulted_comparison_inaccessible) | |||
7424 | << FD << Subobj.Kind << Subobj.Decl | |||
7425 | : S.PDiag())) | |||
7426 | return Result::deleted(); | |||
7427 | } | |||
7428 | ||||
7429 | // C++2a [class.compare.default]p3 [P2002R0]: | |||
7430 | // A defaulted comparison function is constexpr-compatible if [...] | |||
7431 | // no overlod resolution performed [...] results in a non-constexpr | |||
7432 | // function. | |||
7433 | if (FunctionDecl *BestFD = Best->Function) { | |||
7434 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 7434, __PRETTY_FUNCTION__)); | |||
7435 | // If it's not constexpr, explain why not. | |||
7436 | if (Diagnose == ExplainConstexpr && !BestFD->isConstexpr()) { | |||
7437 | if (Subobj.Kind != Subobject::CompleteObject) | |||
7438 | S.Diag(Subobj.Loc, diag::note_defaulted_comparison_not_constexpr) | |||
7439 | << Subobj.Kind << Subobj.Decl; | |||
7440 | S.Diag(BestFD->getLocation(), | |||
7441 | diag::note_defaulted_comparison_not_constexpr_here); | |||
7442 | // Bail out after explaining; we don't want any more notes. | |||
7443 | return Result::deleted(); | |||
7444 | } | |||
7445 | R.Constexpr &= BestFD->isConstexpr(); | |||
7446 | } | |||
7447 | ||||
7448 | if (OO == OO_Spaceship && FD->getReturnType()->isUndeducedAutoType()) { | |||
7449 | if (auto *BestFD = Best->Function) { | |||
7450 | // If any callee has an undeduced return type, deduce it now. | |||
7451 | // FIXME: It's not clear how a failure here should be handled. For | |||
7452 | // now, we produce an eager diagnostic, because that is forward | |||
7453 | // compatible with most (all?) other reasonable options. | |||
7454 | if (BestFD->getReturnType()->isUndeducedType() && | |||
7455 | S.DeduceReturnType(BestFD, FD->getLocation(), | |||
7456 | /*Diagnose=*/false)) { | |||
7457 | // Don't produce a duplicate error when asked to explain why the | |||
7458 | // comparison is deleted: we diagnosed that when initially checking | |||
7459 | // the defaulted operator. | |||
7460 | if (Diagnose == NoDiagnostics) { | |||
7461 | S.Diag( | |||
7462 | FD->getLocation(), | |||
7463 | diag::err_defaulted_comparison_cannot_deduce_undeduced_auto) | |||
7464 | << Subobj.Kind << Subobj.Decl; | |||
7465 | S.Diag( | |||
7466 | Subobj.Loc, | |||
7467 | diag::note_defaulted_comparison_cannot_deduce_undeduced_auto) | |||
7468 | << Subobj.Kind << Subobj.Decl; | |||
7469 | S.Diag(BestFD->getLocation(), | |||
7470 | diag::note_defaulted_comparison_cannot_deduce_callee) | |||
7471 | << Subobj.Kind << Subobj.Decl; | |||
7472 | } | |||
7473 | return Result::deleted(); | |||
7474 | } | |||
7475 | if (auto *Info = S.Context.CompCategories.lookupInfoForType( | |||
7476 | BestFD->getCallResultType())) { | |||
7477 | R.Category = Info->Kind; | |||
7478 | } else { | |||
7479 | if (Diagnose == ExplainDeleted) { | |||
7480 | S.Diag(Subobj.Loc, diag::note_defaulted_comparison_cannot_deduce) | |||
7481 | << Subobj.Kind << Subobj.Decl | |||
7482 | << BestFD->getCallResultType().withoutLocalFastQualifiers(); | |||
7483 | S.Diag(BestFD->getLocation(), | |||
7484 | diag::note_defaulted_comparison_cannot_deduce_callee) | |||
7485 | << Subobj.Kind << Subobj.Decl; | |||
7486 | } | |||
7487 | return Result::deleted(); | |||
7488 | } | |||
7489 | } else { | |||
7490 | Optional<ComparisonCategoryType> Cat = | |||
7491 | getComparisonCategoryForBuiltinCmp(Args[0]->getType()); | |||
7492 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 7492, __PRETTY_FUNCTION__)); | |||
7493 | R.Category = *Cat; | |||
7494 | } | |||
7495 | } | |||
7496 | ||||
7497 | // Note that we might be rewriting to a different operator. That call is | |||
7498 | // not considered until we come to actually build the comparison function. | |||
7499 | break; | |||
7500 | } | |||
7501 | ||||
7502 | case OR_Ambiguous: | |||
7503 | if (Diagnose == ExplainDeleted) { | |||
7504 | unsigned Kind = 0; | |||
7505 | if (FD->getOverloadedOperator() == OO_Spaceship && OO != OO_Spaceship) | |||
7506 | Kind = OO == OO_EqualEqual ? 1 : 2; | |||
7507 | CandidateSet.NoteCandidates( | |||
7508 | PartialDiagnosticAt( | |||
7509 | Subobj.Loc, S.PDiag(diag::note_defaulted_comparison_ambiguous) | |||
7510 | << FD << Kind << Subobj.Kind << Subobj.Decl), | |||
7511 | S, OCD_AmbiguousCandidates, Args); | |||
7512 | } | |||
7513 | R = Result::deleted(); | |||
7514 | break; | |||
7515 | ||||
7516 | case OR_Deleted: | |||
7517 | if (Diagnose == ExplainDeleted) { | |||
7518 | if ((DCK == DefaultedComparisonKind::NotEqual || | |||
7519 | DCK == DefaultedComparisonKind::Relational) && | |||
7520 | !Best->RewriteKind) { | |||
7521 | S.Diag(Best->Function->getLocation(), | |||
7522 | diag::note_defaulted_comparison_not_rewritten_callee) | |||
7523 | << FD; | |||
7524 | } else { | |||
7525 | S.Diag(Subobj.Loc, | |||
7526 | diag::note_defaulted_comparison_calls_deleted) | |||
7527 | << FD << Subobj.Kind << Subobj.Decl; | |||
7528 | S.NoteDeletedFunction(Best->Function); | |||
7529 | } | |||
7530 | } | |||
7531 | R = Result::deleted(); | |||
7532 | break; | |||
7533 | ||||
7534 | case OR_No_Viable_Function: | |||
7535 | // If there's no usable candidate, we're done unless we can rewrite a | |||
7536 | // '<=>' in terms of '==' and '<'. | |||
7537 | if (OO == OO_Spaceship && | |||
7538 | S.Context.CompCategories.lookupInfoForType(FD->getReturnType())) { | |||
7539 | // For any kind of comparison category return type, we need a usable | |||
7540 | // '==' and a usable '<'. | |||
7541 | if (!R.add(visitBinaryOperator(OO_EqualEqual, Args, Subobj, | |||
7542 | &CandidateSet))) | |||
7543 | R.add(visitBinaryOperator(OO_Less, Args, Subobj, &CandidateSet)); | |||
7544 | break; | |||
7545 | } | |||
7546 | ||||
7547 | if (Diagnose == ExplainDeleted) { | |||
7548 | S.Diag(Subobj.Loc, diag::note_defaulted_comparison_no_viable_function) | |||
7549 | << FD << Subobj.Kind << Subobj.Decl; | |||
7550 | ||||
7551 | // For a three-way comparison, list both the candidates for the | |||
7552 | // original operator and the candidates for the synthesized operator. | |||
7553 | if (SpaceshipCandidates) { | |||
7554 | SpaceshipCandidates->NoteCandidates( | |||
7555 | S, Args, | |||
7556 | SpaceshipCandidates->CompleteCandidates(S, OCD_AllCandidates, | |||
7557 | Args, FD->getLocation())); | |||
7558 | S.Diag(Subobj.Loc, | |||
7559 | diag::note_defaulted_comparison_no_viable_function_synthesized) | |||
7560 | << (OO == OO_EqualEqual ? 0 : 1); | |||
7561 | } | |||
7562 | ||||
7563 | CandidateSet.NoteCandidates( | |||
7564 | S, Args, | |||
7565 | CandidateSet.CompleteCandidates(S, OCD_AllCandidates, Args, | |||
7566 | FD->getLocation())); | |||
7567 | } | |||
7568 | R = Result::deleted(); | |||
7569 | break; | |||
7570 | } | |||
7571 | ||||
7572 | return R; | |||
7573 | } | |||
7574 | }; | |||
7575 | ||||
7576 | /// A list of statements. | |||
7577 | struct StmtListResult { | |||
7578 | bool IsInvalid = false; | |||
7579 | llvm::SmallVector<Stmt*, 16> Stmts; | |||
7580 | ||||
7581 | bool add(const StmtResult &S) { | |||
7582 | IsInvalid |= S.isInvalid(); | |||
7583 | if (IsInvalid) | |||
7584 | return true; | |||
7585 | Stmts.push_back(S.get()); | |||
7586 | return false; | |||
7587 | } | |||
7588 | }; | |||
7589 | ||||
7590 | /// A visitor over the notional body of a defaulted comparison that synthesizes | |||
7591 | /// the actual body. | |||
7592 | class DefaultedComparisonSynthesizer | |||
7593 | : public DefaultedComparisonVisitor<DefaultedComparisonSynthesizer, | |||
7594 | StmtListResult, StmtResult, | |||
7595 | std::pair<ExprResult, ExprResult>> { | |||
7596 | SourceLocation Loc; | |||
7597 | unsigned ArrayDepth = 0; | |||
7598 | ||||
7599 | public: | |||
7600 | using Base = DefaultedComparisonVisitor; | |||
7601 | using ExprPair = std::pair<ExprResult, ExprResult>; | |||
7602 | ||||
7603 | friend Base; | |||
7604 | ||||
7605 | DefaultedComparisonSynthesizer(Sema &S, CXXRecordDecl *RD, FunctionDecl *FD, | |||
7606 | DefaultedComparisonKind DCK, | |||
7607 | SourceLocation BodyLoc) | |||
7608 | : Base(S, RD, FD, DCK), Loc(BodyLoc) {} | |||
7609 | ||||
7610 | /// Build a suitable function body for this defaulted comparison operator. | |||
7611 | StmtResult build() { | |||
7612 | Sema::CompoundScopeRAII CompoundScope(S); | |||
7613 | ||||
7614 | StmtListResult Stmts = visit(); | |||
7615 | if (Stmts.IsInvalid) | |||
7616 | return StmtError(); | |||
7617 | ||||
7618 | ExprResult RetVal; | |||
7619 | switch (DCK) { | |||
7620 | case DefaultedComparisonKind::None: | |||
7621 | llvm_unreachable("not a defaulted comparison")::llvm::llvm_unreachable_internal("not a defaulted comparison" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 7621); | |||
7622 | ||||
7623 | case DefaultedComparisonKind::Equal: { | |||
7624 | // C++2a [class.eq]p3: | |||
7625 | // [...] compar[e] the corresponding elements [...] until the first | |||
7626 | // index i where xi == yi yields [...] false. If no such index exists, | |||
7627 | // V is true. Otherwise, V is false. | |||
7628 | // | |||
7629 | // Join the comparisons with '&&'s and return the result. Use a right | |||
7630 | // fold (traversing the conditions right-to-left), because that | |||
7631 | // short-circuits more naturally. | |||
7632 | auto OldStmts = std::move(Stmts.Stmts); | |||
7633 | Stmts.Stmts.clear(); | |||
7634 | ExprResult CmpSoFar; | |||
7635 | // Finish a particular comparison chain. | |||
7636 | auto FinishCmp = [&] { | |||
7637 | if (Expr *Prior = CmpSoFar.get()) { | |||
7638 | // Convert the last expression to 'return ...;' | |||
7639 | if (RetVal.isUnset() && Stmts.Stmts.empty()) | |||
7640 | RetVal = CmpSoFar; | |||
7641 | // Convert any prior comparison to 'if (!(...)) return false;' | |||
7642 | else if (Stmts.add(buildIfNotCondReturnFalse(Prior))) | |||
7643 | return true; | |||
7644 | CmpSoFar = ExprResult(); | |||
7645 | } | |||
7646 | return false; | |||
7647 | }; | |||
7648 | for (Stmt *EAsStmt : llvm::reverse(OldStmts)) { | |||
7649 | Expr *E = dyn_cast<Expr>(EAsStmt); | |||
7650 | if (!E) { | |||
7651 | // Found an array comparison. | |||
7652 | if (FinishCmp() || Stmts.add(EAsStmt)) | |||
7653 | return StmtError(); | |||
7654 | continue; | |||
7655 | } | |||
7656 | ||||
7657 | if (CmpSoFar.isUnset()) { | |||
7658 | CmpSoFar = E; | |||
7659 | continue; | |||
7660 | } | |||
7661 | CmpSoFar = S.CreateBuiltinBinOp(Loc, BO_LAnd, E, CmpSoFar.get()); | |||
7662 | if (CmpSoFar.isInvalid()) | |||
7663 | return StmtError(); | |||
7664 | } | |||
7665 | if (FinishCmp()) | |||
7666 | return StmtError(); | |||
7667 | std::reverse(Stmts.Stmts.begin(), Stmts.Stmts.end()); | |||
7668 | // If no such index exists, V is true. | |||
7669 | if (RetVal.isUnset()) | |||
7670 | RetVal = S.ActOnCXXBoolLiteral(Loc, tok::kw_true); | |||
7671 | break; | |||
7672 | } | |||
7673 | ||||
7674 | case DefaultedComparisonKind::ThreeWay: { | |||
7675 | // Per C++2a [class.spaceship]p3, as a fallback add: | |||
7676 | // return static_cast<R>(std::strong_ordering::equal); | |||
7677 | QualType StrongOrdering = S.CheckComparisonCategoryType( | |||
7678 | ComparisonCategoryType::StrongOrdering, Loc, | |||
7679 | Sema::ComparisonCategoryUsage::DefaultedOperator); | |||
7680 | if (StrongOrdering.isNull()) | |||
7681 | return StmtError(); | |||
7682 | VarDecl *EqualVD = S.Context.CompCategories.getInfoForType(StrongOrdering) | |||
7683 | .getValueInfo(ComparisonCategoryResult::Equal) | |||
7684 | ->VD; | |||
7685 | RetVal = getDecl(EqualVD); | |||
7686 | if (RetVal.isInvalid()) | |||
7687 | return StmtError(); | |||
7688 | RetVal = buildStaticCastToR(RetVal.get()); | |||
7689 | break; | |||
7690 | } | |||
7691 | ||||
7692 | case DefaultedComparisonKind::NotEqual: | |||
7693 | case DefaultedComparisonKind::Relational: | |||
7694 | RetVal = cast<Expr>(Stmts.Stmts.pop_back_val()); | |||
7695 | break; | |||
7696 | } | |||
7697 | ||||
7698 | // Build the final return statement. | |||
7699 | if (RetVal.isInvalid()) | |||
7700 | return StmtError(); | |||
7701 | StmtResult ReturnStmt = S.BuildReturnStmt(Loc, RetVal.get()); | |||
7702 | if (ReturnStmt.isInvalid()) | |||
7703 | return StmtError(); | |||
7704 | Stmts.Stmts.push_back(ReturnStmt.get()); | |||
7705 | ||||
7706 | return S.ActOnCompoundStmt(Loc, Loc, Stmts.Stmts, /*IsStmtExpr=*/false); | |||
7707 | } | |||
7708 | ||||
7709 | private: | |||
7710 | ExprResult getDecl(ValueDecl *VD) { | |||
7711 | return S.BuildDeclarationNameExpr( | |||
7712 | CXXScopeSpec(), DeclarationNameInfo(VD->getDeclName(), Loc), VD); | |||
7713 | } | |||
7714 | ||||
7715 | ExprResult getParam(unsigned I) { | |||
7716 | ParmVarDecl *PD = FD->getParamDecl(I); | |||
7717 | return getDecl(PD); | |||
7718 | } | |||
7719 | ||||
7720 | ExprPair getCompleteObject() { | |||
7721 | unsigned Param = 0; | |||
7722 | ExprResult LHS; | |||
7723 | if (isa<CXXMethodDecl>(FD)) { | |||
7724 | // LHS is '*this'. | |||
7725 | LHS = S.ActOnCXXThis(Loc); | |||
7726 | if (!LHS.isInvalid()) | |||
7727 | LHS = S.CreateBuiltinUnaryOp(Loc, UO_Deref, LHS.get()); | |||
7728 | } else { | |||
7729 | LHS = getParam(Param++); | |||
7730 | } | |||
7731 | ExprResult RHS = getParam(Param++); | |||
7732 | assert(Param == FD->getNumParams())((Param == FD->getNumParams()) ? static_cast<void> ( 0) : __assert_fail ("Param == FD->getNumParams()", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 7732, __PRETTY_FUNCTION__)); | |||
7733 | return {LHS, RHS}; | |||
7734 | } | |||
7735 | ||||
7736 | ExprPair getBase(CXXBaseSpecifier *Base) { | |||
7737 | ExprPair Obj = getCompleteObject(); | |||
7738 | if (Obj.first.isInvalid() || Obj.second.isInvalid()) | |||
7739 | return {ExprError(), ExprError()}; | |||
7740 | CXXCastPath Path = {Base}; | |||
7741 | return {S.ImpCastExprToType(Obj.first.get(), Base->getType(), | |||
7742 | CK_DerivedToBase, VK_LValue, &Path), | |||
7743 | S.ImpCastExprToType(Obj.second.get(), Base->getType(), | |||
7744 | CK_DerivedToBase, VK_LValue, &Path)}; | |||
7745 | } | |||
7746 | ||||
7747 | ExprPair getField(FieldDecl *Field) { | |||
7748 | ExprPair Obj = getCompleteObject(); | |||
7749 | if (Obj.first.isInvalid() || Obj.second.isInvalid()) | |||
7750 | return {ExprError(), ExprError()}; | |||
7751 | ||||
7752 | DeclAccessPair Found = DeclAccessPair::make(Field, Field->getAccess()); | |||
7753 | DeclarationNameInfo NameInfo(Field->getDeclName(), Loc); | |||
7754 | return {S.BuildFieldReferenceExpr(Obj.first.get(), /*IsArrow=*/false, Loc, | |||
7755 | CXXScopeSpec(), Field, Found, NameInfo), | |||
7756 | S.BuildFieldReferenceExpr(Obj.second.get(), /*IsArrow=*/false, Loc, | |||
7757 | CXXScopeSpec(), Field, Found, NameInfo)}; | |||
7758 | } | |||
7759 | ||||
7760 | // FIXME: When expanding a subobject, register a note in the code synthesis | |||
7761 | // stack to say which subobject we're comparing. | |||
7762 | ||||
7763 | StmtResult buildIfNotCondReturnFalse(ExprResult Cond) { | |||
7764 | if (Cond.isInvalid()) | |||
7765 | return StmtError(); | |||
7766 | ||||
7767 | ExprResult NotCond = S.CreateBuiltinUnaryOp(Loc, UO_LNot, Cond.get()); | |||
7768 | if (NotCond.isInvalid()) | |||
7769 | return StmtError(); | |||
7770 | ||||
7771 | ExprResult False = S.ActOnCXXBoolLiteral(Loc, tok::kw_false); | |||
7772 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 7772, __PRETTY_FUNCTION__)); | |||
7773 | StmtResult ReturnFalse = S.BuildReturnStmt(Loc, False.get()); | |||
7774 | if (ReturnFalse.isInvalid()) | |||
7775 | return StmtError(); | |||
7776 | ||||
7777 | return S.ActOnIfStmt(Loc, false, nullptr, | |||
7778 | S.ActOnCondition(nullptr, Loc, NotCond.get(), | |||
7779 | Sema::ConditionKind::Boolean), | |||
7780 | ReturnFalse.get(), SourceLocation(), nullptr); | |||
7781 | } | |||
7782 | ||||
7783 | StmtResult visitSubobjectArray(QualType Type, llvm::APInt Size, | |||
7784 | ExprPair Subobj) { | |||
7785 | QualType SizeType = S.Context.getSizeType(); | |||
7786 | Size = Size.zextOrTrunc(S.Context.getTypeSize(SizeType)); | |||
7787 | ||||
7788 | // Build 'size_t i$n = 0'. | |||
7789 | IdentifierInfo *IterationVarName = nullptr; | |||
7790 | { | |||
7791 | SmallString<8> Str; | |||
7792 | llvm::raw_svector_ostream OS(Str); | |||
7793 | OS << "i" << ArrayDepth; | |||
7794 | IterationVarName = &S.Context.Idents.get(OS.str()); | |||
7795 | } | |||
7796 | VarDecl *IterationVar = VarDecl::Create( | |||
7797 | S.Context, S.CurContext, Loc, Loc, IterationVarName, SizeType, | |||
7798 | S.Context.getTrivialTypeSourceInfo(SizeType, Loc), SC_None); | |||
7799 | llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); | |||
7800 | IterationVar->setInit( | |||
7801 | IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); | |||
7802 | Stmt *Init = new (S.Context) DeclStmt(DeclGroupRef(IterationVar), Loc, Loc); | |||
7803 | ||||
7804 | auto IterRef = [&] { | |||
7805 | ExprResult Ref = S.BuildDeclarationNameExpr( | |||
7806 | CXXScopeSpec(), DeclarationNameInfo(IterationVarName, Loc), | |||
7807 | IterationVar); | |||
7808 | assert(!Ref.isInvalid() && "can't reference our own variable?")((!Ref.isInvalid() && "can't reference our own variable?" ) ? static_cast<void> (0) : __assert_fail ("!Ref.isInvalid() && \"can't reference our own variable?\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 7808, __PRETTY_FUNCTION__)); | |||
7809 | return Ref.get(); | |||
7810 | }; | |||
7811 | ||||
7812 | // Build 'i$n != Size'. | |||
7813 | ExprResult Cond = S.CreateBuiltinBinOp( | |||
7814 | Loc, BO_NE, IterRef(), | |||
7815 | IntegerLiteral::Create(S.Context, Size, SizeType, Loc)); | |||
7816 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 7816, __PRETTY_FUNCTION__)); | |||
7817 | ||||
7818 | // Build '++i$n'. | |||
7819 | ExprResult Inc = S.CreateBuiltinUnaryOp(Loc, UO_PreInc, IterRef()); | |||
7820 | assert(!Inc.isInvalid() && "should never fail")((!Inc.isInvalid() && "should never fail") ? static_cast <void> (0) : __assert_fail ("!Inc.isInvalid() && \"should never fail\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 7820, __PRETTY_FUNCTION__)); | |||
7821 | ||||
7822 | // Build 'a[i$n]' and 'b[i$n]'. | |||
7823 | auto Index = [&](ExprResult E) { | |||
7824 | if (E.isInvalid()) | |||
7825 | return ExprError(); | |||
7826 | return S.CreateBuiltinArraySubscriptExpr(E.get(), Loc, IterRef(), Loc); | |||
7827 | }; | |||
7828 | Subobj.first = Index(Subobj.first); | |||
7829 | Subobj.second = Index(Subobj.second); | |||
7830 | ||||
7831 | // Compare the array elements. | |||
7832 | ++ArrayDepth; | |||
7833 | StmtResult Substmt = visitSubobject(Type, Subobj); | |||
7834 | --ArrayDepth; | |||
7835 | ||||
7836 | if (Substmt.isInvalid()) | |||
7837 | return StmtError(); | |||
7838 | ||||
7839 | // For the inner level of an 'operator==', build 'if (!cmp) return false;'. | |||
7840 | // For outer levels or for an 'operator<=>' we already have a suitable | |||
7841 | // statement that returns as necessary. | |||
7842 | if (Expr *ElemCmp = dyn_cast<Expr>(Substmt.get())) { | |||
7843 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 7844, __PRETTY_FUNCTION__)) | |||
7844 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 7844, __PRETTY_FUNCTION__)); | |||
7845 | Substmt = buildIfNotCondReturnFalse(ElemCmp); | |||
7846 | if (Substmt.isInvalid()) | |||
7847 | return StmtError(); | |||
7848 | } | |||
7849 | ||||
7850 | // Build 'for (...) ...' | |||
7851 | return S.ActOnForStmt(Loc, Loc, Init, | |||
7852 | S.ActOnCondition(nullptr, Loc, Cond.get(), | |||
7853 | Sema::ConditionKind::Boolean), | |||
7854 | S.MakeFullDiscardedValueExpr(Inc.get()), Loc, | |||
7855 | Substmt.get()); | |||
7856 | } | |||
7857 | ||||
7858 | StmtResult visitExpandedSubobject(QualType Type, ExprPair Obj) { | |||
7859 | if (Obj.first.isInvalid() || Obj.second.isInvalid()) | |||
7860 | return StmtError(); | |||
7861 | ||||
7862 | OverloadedOperatorKind OO = FD->getOverloadedOperator(); | |||
7863 | BinaryOperatorKind Opc = BinaryOperator::getOverloadedOpcode(OO); | |||
7864 | ExprResult Op; | |||
7865 | if (Type->isOverloadableType()) | |||
7866 | Op = S.CreateOverloadedBinOp(Loc, Opc, Fns, Obj.first.get(), | |||
7867 | Obj.second.get(), /*PerformADL=*/true, | |||
7868 | /*AllowRewrittenCandidates=*/true, FD); | |||
7869 | else | |||
7870 | Op = S.CreateBuiltinBinOp(Loc, Opc, Obj.first.get(), Obj.second.get()); | |||
7871 | if (Op.isInvalid()) | |||
7872 | return StmtError(); | |||
7873 | ||||
7874 | switch (DCK) { | |||
7875 | case DefaultedComparisonKind::None: | |||
7876 | llvm_unreachable("not a defaulted comparison")::llvm::llvm_unreachable_internal("not a defaulted comparison" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 7876); | |||
7877 | ||||
7878 | case DefaultedComparisonKind::Equal: | |||
7879 | // Per C++2a [class.eq]p2, each comparison is individually contextually | |||
7880 | // converted to bool. | |||
7881 | Op = S.PerformContextuallyConvertToBool(Op.get()); | |||
7882 | if (Op.isInvalid()) | |||
7883 | return StmtError(); | |||
7884 | return Op.get(); | |||
7885 | ||||
7886 | case DefaultedComparisonKind::ThreeWay: { | |||
7887 | // Per C++2a [class.spaceship]p3, form: | |||
7888 | // if (R cmp = static_cast<R>(op); cmp != 0) | |||
7889 | // return cmp; | |||
7890 | QualType R = FD->getReturnType(); | |||
7891 | Op = buildStaticCastToR(Op.get()); | |||
7892 | if (Op.isInvalid()) | |||
7893 | return StmtError(); | |||
7894 | ||||
7895 | // R cmp = ...; | |||
7896 | IdentifierInfo *Name = &S.Context.Idents.get("cmp"); | |||
7897 | VarDecl *VD = | |||
7898 | VarDecl::Create(S.Context, S.CurContext, Loc, Loc, Name, R, | |||
7899 | S.Context.getTrivialTypeSourceInfo(R, Loc), SC_None); | |||
7900 | S.AddInitializerToDecl(VD, Op.get(), /*DirectInit=*/false); | |||
7901 | Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(VD), Loc, Loc); | |||
7902 | ||||
7903 | // cmp != 0 | |||
7904 | ExprResult VDRef = getDecl(VD); | |||
7905 | if (VDRef.isInvalid()) | |||
7906 | return StmtError(); | |||
7907 | llvm::APInt ZeroVal(S.Context.getIntWidth(S.Context.IntTy), 0); | |||
7908 | Expr *Zero = | |||
7909 | IntegerLiteral::Create(S.Context, ZeroVal, S.Context.IntTy, Loc); | |||
7910 | ExprResult Comp; | |||
7911 | if (VDRef.get()->getType()->isOverloadableType()) | |||
7912 | Comp = S.CreateOverloadedBinOp(Loc, BO_NE, Fns, VDRef.get(), Zero, true, | |||
7913 | true, FD); | |||
7914 | else | |||
7915 | Comp = S.CreateBuiltinBinOp(Loc, BO_NE, VDRef.get(), Zero); | |||
7916 | if (Comp.isInvalid()) | |||
7917 | return StmtError(); | |||
7918 | Sema::ConditionResult Cond = S.ActOnCondition( | |||
7919 | nullptr, Loc, Comp.get(), Sema::ConditionKind::Boolean); | |||
7920 | if (Cond.isInvalid()) | |||
7921 | return StmtError(); | |||
7922 | ||||
7923 | // return cmp; | |||
7924 | VDRef = getDecl(VD); | |||
7925 | if (VDRef.isInvalid()) | |||
7926 | return StmtError(); | |||
7927 | StmtResult ReturnStmt = S.BuildReturnStmt(Loc, VDRef.get()); | |||
7928 | if (ReturnStmt.isInvalid()) | |||
7929 | return StmtError(); | |||
7930 | ||||
7931 | // if (...) | |||
7932 | return S.ActOnIfStmt(Loc, /*IsConstexpr=*/false, InitStmt, Cond, | |||
7933 | ReturnStmt.get(), /*ElseLoc=*/SourceLocation(), | |||
7934 | /*Else=*/nullptr); | |||
7935 | } | |||
7936 | ||||
7937 | case DefaultedComparisonKind::NotEqual: | |||
7938 | case DefaultedComparisonKind::Relational: | |||
7939 | // C++2a [class.compare.secondary]p2: | |||
7940 | // Otherwise, the operator function yields x @ y. | |||
7941 | return Op.get(); | |||
7942 | } | |||
7943 | llvm_unreachable("")::llvm::llvm_unreachable_internal("", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 7943); | |||
7944 | } | |||
7945 | ||||
7946 | /// Build "static_cast<R>(E)". | |||
7947 | ExprResult buildStaticCastToR(Expr *E) { | |||
7948 | QualType R = FD->getReturnType(); | |||
7949 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 7949, __PRETTY_FUNCTION__)); | |||
7950 | ||||
7951 | // Don't bother forming a no-op cast in the common case. | |||
7952 | if (E->isRValue() && S.Context.hasSameType(E->getType(), R)) | |||
7953 | return E; | |||
7954 | return S.BuildCXXNamedCast(Loc, tok::kw_static_cast, | |||
7955 | S.Context.getTrivialTypeSourceInfo(R, Loc), E, | |||
7956 | SourceRange(Loc, Loc), SourceRange(Loc, Loc)); | |||
7957 | } | |||
7958 | }; | |||
7959 | } | |||
7960 | ||||
7961 | /// Perform the unqualified lookups that might be needed to form a defaulted | |||
7962 | /// comparison function for the given operator. | |||
7963 | static void lookupOperatorsForDefaultedComparison(Sema &Self, Scope *S, | |||
7964 | UnresolvedSetImpl &Operators, | |||
7965 | OverloadedOperatorKind Op) { | |||
7966 | auto Lookup = [&](OverloadedOperatorKind OO) { | |||
7967 | Self.LookupOverloadedOperatorName(OO, S, QualType(), QualType(), Operators); | |||
7968 | }; | |||
7969 | ||||
7970 | // Every defaulted operator looks up itself. | |||
7971 | Lookup(Op); | |||
7972 | // ... and the rewritten form of itself, if any. | |||
7973 | if (OverloadedOperatorKind ExtraOp = getRewrittenOverloadedOperator(Op)) | |||
7974 | Lookup(ExtraOp); | |||
7975 | ||||
7976 | // For 'operator<=>', we also form a 'cmp != 0' expression, and might | |||
7977 | // synthesize a three-way comparison from '<' and '=='. In a dependent | |||
7978 | // context, we also need to look up '==' in case we implicitly declare a | |||
7979 | // defaulted 'operator=='. | |||
7980 | if (Op == OO_Spaceship) { | |||
7981 | Lookup(OO_ExclaimEqual); | |||
7982 | Lookup(OO_Less); | |||
7983 | Lookup(OO_EqualEqual); | |||
7984 | } | |||
7985 | } | |||
7986 | ||||
7987 | bool Sema::CheckExplicitlyDefaultedComparison(Scope *S, FunctionDecl *FD, | |||
7988 | DefaultedComparisonKind DCK) { | |||
7989 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 7989, __PRETTY_FUNCTION__)); | |||
7990 | ||||
7991 | CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(FD->getLexicalDeclContext()); | |||
7992 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 7992, __PRETTY_FUNCTION__)); | |||
7993 | ||||
7994 | // Perform any unqualified lookups we're going to need to default this | |||
7995 | // function. | |||
7996 | if (S) { | |||
7997 | UnresolvedSet<32> Operators; | |||
7998 | lookupOperatorsForDefaultedComparison(*this, S, Operators, | |||
7999 | FD->getOverloadedOperator()); | |||
8000 | FD->setDefaultedFunctionInfo(FunctionDecl::DefaultedFunctionInfo::Create( | |||
8001 | Context, Operators.pairs())); | |||
8002 | } | |||
8003 | ||||
8004 | // C++2a [class.compare.default]p1: | |||
8005 | // A defaulted comparison operator function for some class C shall be a | |||
8006 | // non-template function declared in the member-specification of C that is | |||
8007 | // -- a non-static const member of C having one parameter of type | |||
8008 | // const C&, or | |||
8009 | // -- a friend of C having two parameters of type const C& or two | |||
8010 | // parameters of type C. | |||
8011 | QualType ExpectedParmType1 = Context.getRecordType(RD); | |||
8012 | QualType ExpectedParmType2 = | |||
8013 | Context.getLValueReferenceType(ExpectedParmType1.withConst()); | |||
8014 | if (isa<CXXMethodDecl>(FD)) | |||
8015 | ExpectedParmType1 = ExpectedParmType2; | |||
8016 | for (const ParmVarDecl *Param : FD->parameters()) { | |||
8017 | if (!Param->getType()->isDependentType() && | |||
8018 | !Context.hasSameType(Param->getType(), ExpectedParmType1) && | |||
8019 | !Context.hasSameType(Param->getType(), ExpectedParmType2)) { | |||
8020 | // Don't diagnose an implicit 'operator=='; we will have diagnosed the | |||
8021 | // corresponding defaulted 'operator<=>' already. | |||
8022 | if (!FD->isImplicit()) { | |||
8023 | Diag(FD->getLocation(), diag::err_defaulted_comparison_param) | |||
8024 | << (int)DCK << Param->getType() << ExpectedParmType1 | |||
8025 | << !isa<CXXMethodDecl>(FD) | |||
8026 | << ExpectedParmType2 << Param->getSourceRange(); | |||
8027 | } | |||
8028 | return true; | |||
8029 | } | |||
8030 | } | |||
8031 | if (FD->getNumParams() == 2 && | |||
8032 | !Context.hasSameType(FD->getParamDecl(0)->getType(), | |||
8033 | FD->getParamDecl(1)->getType())) { | |||
8034 | if (!FD->isImplicit()) { | |||
8035 | Diag(FD->getLocation(), diag::err_defaulted_comparison_param_mismatch) | |||
8036 | << (int)DCK | |||
8037 | << FD->getParamDecl(0)->getType() | |||
8038 | << FD->getParamDecl(0)->getSourceRange() | |||
8039 | << FD->getParamDecl(1)->getType() | |||
8040 | << FD->getParamDecl(1)->getSourceRange(); | |||
8041 | } | |||
8042 | return true; | |||
8043 | } | |||
8044 | ||||
8045 | // ... non-static const member ... | |||
8046 | if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) { | |||
8047 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 8047, __PRETTY_FUNCTION__)); | |||
8048 | if (!MD->isConst()) { | |||
8049 | SourceLocation InsertLoc; | |||
8050 | if (FunctionTypeLoc Loc = MD->getFunctionTypeLoc()) | |||
8051 | InsertLoc = getLocForEndOfToken(Loc.getRParenLoc()); | |||
8052 | // Don't diagnose an implicit 'operator=='; we will have diagnosed the | |||
8053 | // corresponding defaulted 'operator<=>' already. | |||
8054 | if (!MD->isImplicit()) { | |||
8055 | Diag(MD->getLocation(), diag::err_defaulted_comparison_non_const) | |||
8056 | << (int)DCK << FixItHint::CreateInsertion(InsertLoc, " const"); | |||
8057 | } | |||
8058 | ||||
8059 | // Add the 'const' to the type to recover. | |||
8060 | const auto *FPT = MD->getType()->castAs<FunctionProtoType>(); | |||
8061 | FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); | |||
8062 | EPI.TypeQuals.addConst(); | |||
8063 | MD->setType(Context.getFunctionType(FPT->getReturnType(), | |||
8064 | FPT->getParamTypes(), EPI)); | |||
8065 | } | |||
8066 | } else { | |||
8067 | // A non-member function declared in a class must be a friend. | |||
8068 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 8068, __PRETTY_FUNCTION__)); | |||
8069 | } | |||
8070 | ||||
8071 | // C++2a [class.eq]p1, [class.rel]p1: | |||
8072 | // A [defaulted comparison other than <=>] shall have a declared return | |||
8073 | // type bool. | |||
8074 | if (DCK != DefaultedComparisonKind::ThreeWay && | |||
8075 | !FD->getDeclaredReturnType()->isDependentType() && | |||
8076 | !Context.hasSameType(FD->getDeclaredReturnType(), Context.BoolTy)) { | |||
8077 | Diag(FD->getLocation(), diag::err_defaulted_comparison_return_type_not_bool) | |||
8078 | << (int)DCK << FD->getDeclaredReturnType() << Context.BoolTy | |||
8079 | << FD->getReturnTypeSourceRange(); | |||
8080 | return true; | |||
8081 | } | |||
8082 | // C++2a [class.spaceship]p2 [P2002R0]: | |||
8083 | // Let R be the declared return type [...]. If R is auto, [...]. Otherwise, | |||
8084 | // R shall not contain a placeholder type. | |||
8085 | if (DCK == DefaultedComparisonKind::ThreeWay && | |||
8086 | FD->getDeclaredReturnType()->getContainedDeducedType() && | |||
8087 | !Context.hasSameType(FD->getDeclaredReturnType(), | |||
8088 | Context.getAutoDeductType())) { | |||
8089 | Diag(FD->getLocation(), | |||
8090 | diag::err_defaulted_comparison_deduced_return_type_not_auto) | |||
8091 | << (int)DCK << FD->getDeclaredReturnType() << Context.AutoDeductTy | |||
8092 | << FD->getReturnTypeSourceRange(); | |||
8093 | return true; | |||
8094 | } | |||
8095 | ||||
8096 | // For a defaulted function in a dependent class, defer all remaining checks | |||
8097 | // until instantiation. | |||
8098 | if (RD->isDependentType()) | |||
8099 | return false; | |||
8100 | ||||
8101 | // Determine whether the function should be defined as deleted. | |||
8102 | DefaultedComparisonInfo Info = | |||
8103 | DefaultedComparisonAnalyzer(*this, RD, FD, DCK).visit(); | |||
8104 | ||||
8105 | bool First = FD == FD->getCanonicalDecl(); | |||
8106 | ||||
8107 | // If we want to delete the function, then do so; there's nothing else to | |||
8108 | // check in that case. | |||
8109 | if (Info.Deleted) { | |||
8110 | if (!First) { | |||
8111 | // C++11 [dcl.fct.def.default]p4: | |||
8112 | // [For a] user-provided explicitly-defaulted function [...] if such a | |||
8113 | // function is implicitly defined as deleted, the program is ill-formed. | |||
8114 | // | |||
8115 | // This is really just a consequence of the general rule that you can | |||
8116 | // only delete a function on its first declaration. | |||
8117 | Diag(FD->getLocation(), diag::err_non_first_default_compare_deletes) | |||
8118 | << FD->isImplicit() << (int)DCK; | |||
8119 | DefaultedComparisonAnalyzer(*this, RD, FD, DCK, | |||
8120 | DefaultedComparisonAnalyzer::ExplainDeleted) | |||
8121 | .visit(); | |||
8122 | return true; | |||
8123 | } | |||
8124 | ||||
8125 | SetDeclDeleted(FD, FD->getLocation()); | |||
8126 | if (!inTemplateInstantiation() && !FD->isImplicit()) { | |||
8127 | Diag(FD->getLocation(), diag::warn_defaulted_comparison_deleted) | |||
8128 | << (int)DCK; | |||
8129 | DefaultedComparisonAnalyzer(*this, RD, FD, DCK, | |||
8130 | DefaultedComparisonAnalyzer::ExplainDeleted) | |||
8131 | .visit(); | |||
8132 | } | |||
8133 | return false; | |||
8134 | } | |||
8135 | ||||
8136 | // C++2a [class.spaceship]p2: | |||
8137 | // The return type is deduced as the common comparison type of R0, R1, ... | |||
8138 | if (DCK == DefaultedComparisonKind::ThreeWay && | |||
8139 | FD->getDeclaredReturnType()->isUndeducedAutoType()) { | |||
8140 | SourceLocation RetLoc = FD->getReturnTypeSourceRange().getBegin(); | |||
8141 | if (RetLoc.isInvalid()) | |||
8142 | RetLoc = FD->getBeginLoc(); | |||
8143 | // FIXME: Should we really care whether we have the complete type and the | |||
8144 | // 'enumerator' constants here? A forward declaration seems sufficient. | |||
8145 | QualType Cat = CheckComparisonCategoryType( | |||
8146 | Info.Category, RetLoc, ComparisonCategoryUsage::DefaultedOperator); | |||
8147 | if (Cat.isNull()) | |||
8148 | return true; | |||
8149 | Context.adjustDeducedFunctionResultType( | |||
8150 | FD, SubstAutoType(FD->getDeclaredReturnType(), Cat)); | |||
8151 | } | |||
8152 | ||||
8153 | // C++2a [dcl.fct.def.default]p3 [P2002R0]: | |||
8154 | // An explicitly-defaulted function that is not defined as deleted may be | |||
8155 | // declared constexpr or consteval only if it is constexpr-compatible. | |||
8156 | // C++2a [class.compare.default]p3 [P2002R0]: | |||
8157 | // A defaulted comparison function is constexpr-compatible if it satisfies | |||
8158 | // the requirements for a constexpr function [...] | |||
8159 | // The only relevant requirements are that the parameter and return types are | |||
8160 | // literal types. The remaining conditions are checked by the analyzer. | |||
8161 | if (FD->isConstexpr()) { | |||
8162 | if (CheckConstexprReturnType(*this, FD, CheckConstexprKind::Diagnose) && | |||
8163 | CheckConstexprParameterTypes(*this, FD, CheckConstexprKind::Diagnose) && | |||
8164 | !Info.Constexpr) { | |||
8165 | Diag(FD->getBeginLoc(), | |||
8166 | diag::err_incorrect_defaulted_comparison_constexpr) | |||
8167 | << FD->isImplicit() << (int)DCK << FD->isConsteval(); | |||
8168 | DefaultedComparisonAnalyzer(*this, RD, FD, DCK, | |||
8169 | DefaultedComparisonAnalyzer::ExplainConstexpr) | |||
8170 | .visit(); | |||
8171 | } | |||
8172 | } | |||
8173 | ||||
8174 | // C++2a [dcl.fct.def.default]p3 [P2002R0]: | |||
8175 | // If a constexpr-compatible function is explicitly defaulted on its first | |||
8176 | // declaration, it is implicitly considered to be constexpr. | |||
8177 | // FIXME: Only applying this to the first declaration seems problematic, as | |||
8178 | // simple reorderings can affect the meaning of the program. | |||
8179 | if (First && !FD->isConstexpr() && Info.Constexpr) | |||
8180 | FD->setConstexprKind(CSK_constexpr); | |||
8181 | ||||
8182 | // C++2a [except.spec]p3: | |||
8183 | // If a declaration of a function does not have a noexcept-specifier | |||
8184 | // [and] is defaulted on its first declaration, [...] the exception | |||
8185 | // specification is as specified below | |||
8186 | if (FD->getExceptionSpecType() == EST_None) { | |||
8187 | auto *FPT = FD->getType()->castAs<FunctionProtoType>(); | |||
8188 | FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); | |||
8189 | EPI.ExceptionSpec.Type = EST_Unevaluated; | |||
8190 | EPI.ExceptionSpec.SourceDecl = FD; | |||
8191 | FD->setType(Context.getFunctionType(FPT->getReturnType(), | |||
8192 | FPT->getParamTypes(), EPI)); | |||
8193 | } | |||
8194 | ||||
8195 | return false; | |||
8196 | } | |||
8197 | ||||
8198 | void Sema::DeclareImplicitEqualityComparison(CXXRecordDecl *RD, | |||
8199 | FunctionDecl *Spaceship) { | |||
8200 | Sema::CodeSynthesisContext Ctx; | |||
8201 | Ctx.Kind = Sema::CodeSynthesisContext::DeclaringImplicitEqualityComparison; | |||
8202 | Ctx.PointOfInstantiation = Spaceship->getEndLoc(); | |||
8203 | Ctx.Entity = Spaceship; | |||
8204 | pushCodeSynthesisContext(Ctx); | |||
8205 | ||||
8206 | if (FunctionDecl *EqualEqual = SubstSpaceshipAsEqualEqual(RD, Spaceship)) | |||
8207 | EqualEqual->setImplicit(); | |||
8208 | ||||
8209 | popCodeSynthesisContext(); | |||
8210 | } | |||
8211 | ||||
8212 | void Sema::DefineDefaultedComparison(SourceLocation UseLoc, FunctionDecl *FD, | |||
8213 | DefaultedComparisonKind DCK) { | |||
8214 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 8215, __PRETTY_FUNCTION__)) | |||
8215 | !FD->doesThisDeclarationHaveABody())((FD->isDefaulted() && !FD->isDeleted() && !FD->doesThisDeclarationHaveABody()) ? static_cast<void > (0) : __assert_fail ("FD->isDefaulted() && !FD->isDeleted() && !FD->doesThisDeclarationHaveABody()" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 8215, __PRETTY_FUNCTION__)); | |||
8216 | if (FD->willHaveBody() || FD->isInvalidDecl()) | |||
8217 | return; | |||
8218 | ||||
8219 | SynthesizedFunctionScope Scope(*this, FD); | |||
8220 | ||||
8221 | // Add a context note for diagnostics produced after this point. | |||
8222 | Scope.addContextNote(UseLoc); | |||
8223 | ||||
8224 | { | |||
8225 | // Build and set up the function body. | |||
8226 | CXXRecordDecl *RD = cast<CXXRecordDecl>(FD->getLexicalParent()); | |||
8227 | SourceLocation BodyLoc = | |||
8228 | FD->getEndLoc().isValid() ? FD->getEndLoc() : FD->getLocation(); | |||
8229 | StmtResult Body = | |||
8230 | DefaultedComparisonSynthesizer(*this, RD, FD, DCK, BodyLoc).build(); | |||
8231 | if (Body.isInvalid()) { | |||
8232 | FD->setInvalidDecl(); | |||
8233 | return; | |||
8234 | } | |||
8235 | FD->setBody(Body.get()); | |||
8236 | FD->markUsed(Context); | |||
8237 | } | |||
8238 | ||||
8239 | // The exception specification is needed because we are defining the | |||
8240 | // function. Note that this will reuse the body we just built. | |||
8241 | ResolveExceptionSpec(UseLoc, FD->getType()->castAs<FunctionProtoType>()); | |||
8242 | ||||
8243 | if (ASTMutationListener *L = getASTMutationListener()) | |||
8244 | L->CompletedImplicitDefinition(FD); | |||
8245 | } | |||
8246 | ||||
8247 | static Sema::ImplicitExceptionSpecification | |||
8248 | ComputeDefaultedComparisonExceptionSpec(Sema &S, SourceLocation Loc, | |||
8249 | FunctionDecl *FD, | |||
8250 | Sema::DefaultedComparisonKind DCK) { | |||
8251 | ComputingExceptionSpec CES(S, FD, Loc); | |||
8252 | Sema::ImplicitExceptionSpecification ExceptSpec(S); | |||
8253 | ||||
8254 | if (FD->isInvalidDecl()) | |||
8255 | return ExceptSpec; | |||
8256 | ||||
8257 | // The common case is that we just defined the comparison function. In that | |||
8258 | // case, just look at whether the body can throw. | |||
8259 | if (FD->hasBody()) { | |||
8260 | ExceptSpec.CalledStmt(FD->getBody()); | |||
8261 | } else { | |||
8262 | // Otherwise, build a body so we can check it. This should ideally only | |||
8263 | // happen when we're not actually marking the function referenced. (This is | |||
8264 | // only really important for efficiency: we don't want to build and throw | |||
8265 | // away bodies for comparison functions more than we strictly need to.) | |||
8266 | ||||
8267 | // Pretend to synthesize the function body in an unevaluated context. | |||
8268 | // Note that we can't actually just go ahead and define the function here: | |||
8269 | // we are not permitted to mark its callees as referenced. | |||
8270 | Sema::SynthesizedFunctionScope Scope(S, FD); | |||
8271 | EnterExpressionEvaluationContext Context( | |||
8272 | S, Sema::ExpressionEvaluationContext::Unevaluated); | |||
8273 | ||||
8274 | CXXRecordDecl *RD = cast<CXXRecordDecl>(FD->getLexicalParent()); | |||
8275 | SourceLocation BodyLoc = | |||
8276 | FD->getEndLoc().isValid() ? FD->getEndLoc() : FD->getLocation(); | |||
8277 | StmtResult Body = | |||
8278 | DefaultedComparisonSynthesizer(S, RD, FD, DCK, BodyLoc).build(); | |||
8279 | if (!Body.isInvalid()) | |||
8280 | ExceptSpec.CalledStmt(Body.get()); | |||
8281 | ||||
8282 | // FIXME: Can we hold onto this body and just transform it to potentially | |||
8283 | // evaluated when we're asked to define the function rather than rebuilding | |||
8284 | // it? Either that, or we should only build the bits of the body that we | |||
8285 | // need (the expressions, not the statements). | |||
8286 | } | |||
8287 | ||||
8288 | return ExceptSpec; | |||
8289 | } | |||
8290 | ||||
8291 | void Sema::CheckDelayedMemberExceptionSpecs() { | |||
8292 | decltype(DelayedOverridingExceptionSpecChecks) Overriding; | |||
8293 | decltype(DelayedEquivalentExceptionSpecChecks) Equivalent; | |||
8294 | ||||
8295 | std::swap(Overriding, DelayedOverridingExceptionSpecChecks); | |||
8296 | std::swap(Equivalent, DelayedEquivalentExceptionSpecChecks); | |||
8297 | ||||
8298 | // Perform any deferred checking of exception specifications for virtual | |||
8299 | // destructors. | |||
8300 | for (auto &Check : Overriding) | |||
8301 | CheckOverridingFunctionExceptionSpec(Check.first, Check.second); | |||
8302 | ||||
8303 | // Perform any deferred checking of exception specifications for befriended | |||
8304 | // special members. | |||
8305 | for (auto &Check : Equivalent) | |||
8306 | CheckEquivalentExceptionSpec(Check.second, Check.first); | |||
8307 | } | |||
8308 | ||||
8309 | namespace { | |||
8310 | /// CRTP base class for visiting operations performed by a special member | |||
8311 | /// function (or inherited constructor). | |||
8312 | template<typename Derived> | |||
8313 | struct SpecialMemberVisitor { | |||
8314 | Sema &S; | |||
8315 | CXXMethodDecl *MD; | |||
8316 | Sema::CXXSpecialMember CSM; | |||
8317 | Sema::InheritedConstructorInfo *ICI; | |||
8318 | ||||
8319 | // Properties of the special member, computed for convenience. | |||
8320 | bool IsConstructor = false, IsAssignment = false, ConstArg = false; | |||
8321 | ||||
8322 | SpecialMemberVisitor(Sema &S, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM, | |||
8323 | Sema::InheritedConstructorInfo *ICI) | |||
8324 | : S(S), MD(MD), CSM(CSM), ICI(ICI) { | |||
8325 | switch (CSM) { | |||
8326 | case Sema::CXXDefaultConstructor: | |||
8327 | case Sema::CXXCopyConstructor: | |||
8328 | case Sema::CXXMoveConstructor: | |||
8329 | IsConstructor = true; | |||
8330 | break; | |||
8331 | case Sema::CXXCopyAssignment: | |||
8332 | case Sema::CXXMoveAssignment: | |||
8333 | IsAssignment = true; | |||
8334 | break; | |||
8335 | case Sema::CXXDestructor: | |||
8336 | break; | |||
8337 | case Sema::CXXInvalid: | |||
8338 | llvm_unreachable("invalid special member kind")::llvm::llvm_unreachable_internal("invalid special member kind" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 8338); | |||
8339 | } | |||
8340 | ||||
8341 | if (MD->getNumParams()) { | |||
8342 | if (const ReferenceType *RT = | |||
8343 | MD->getParamDecl(0)->getType()->getAs<ReferenceType>()) | |||
8344 | ConstArg = RT->getPointeeType().isConstQualified(); | |||
8345 | } | |||
8346 | } | |||
8347 | ||||
8348 | Derived &getDerived() { return static_cast<Derived&>(*this); } | |||
8349 | ||||
8350 | /// Is this a "move" special member? | |||
8351 | bool isMove() const { | |||
8352 | return CSM == Sema::CXXMoveConstructor || CSM == Sema::CXXMoveAssignment; | |||
8353 | } | |||
8354 | ||||
8355 | /// Look up the corresponding special member in the given class. | |||
8356 | Sema::SpecialMemberOverloadResult lookupIn(CXXRecordDecl *Class, | |||
8357 | unsigned Quals, bool IsMutable) { | |||
8358 | return lookupCallFromSpecialMember(S, Class, CSM, Quals, | |||
8359 | ConstArg && !IsMutable); | |||
8360 | } | |||
8361 | ||||
8362 | /// Look up the constructor for the specified base class to see if it's | |||
8363 | /// overridden due to this being an inherited constructor. | |||
8364 | Sema::SpecialMemberOverloadResult lookupInheritedCtor(CXXRecordDecl *Class) { | |||
8365 | if (!ICI) | |||
8366 | return {}; | |||
8367 | assert(CSM == Sema::CXXDefaultConstructor)((CSM == Sema::CXXDefaultConstructor) ? static_cast<void> (0) : __assert_fail ("CSM == Sema::CXXDefaultConstructor", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 8367, __PRETTY_FUNCTION__)); | |||
8368 | auto *BaseCtor = | |||
8369 | cast<CXXConstructorDecl>(MD)->getInheritedConstructor().getConstructor(); | |||
8370 | if (auto *MD = ICI->findConstructorForBase(Class, BaseCtor).first) | |||
8371 | return MD; | |||
8372 | return {}; | |||
8373 | } | |||
8374 | ||||
8375 | /// A base or member subobject. | |||
8376 | typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; | |||
8377 | ||||
8378 | /// Get the location to use for a subobject in diagnostics. | |||
8379 | static SourceLocation getSubobjectLoc(Subobject Subobj) { | |||
8380 | // FIXME: For an indirect virtual base, the direct base leading to | |||
8381 | // the indirect virtual base would be a more useful choice. | |||
8382 | if (auto *B = Subobj.dyn_cast<CXXBaseSpecifier*>()) | |||
8383 | return B->getBaseTypeLoc(); | |||
8384 | else | |||
8385 | return Subobj.get<FieldDecl*>()->getLocation(); | |||
8386 | } | |||
8387 | ||||
8388 | enum BasesToVisit { | |||
8389 | /// Visit all non-virtual (direct) bases. | |||
8390 | VisitNonVirtualBases, | |||
8391 | /// Visit all direct bases, virtual or not. | |||
8392 | VisitDirectBases, | |||
8393 | /// Visit all non-virtual bases, and all virtual bases if the class | |||
8394 | /// is not abstract. | |||
8395 | VisitPotentiallyConstructedBases, | |||
8396 | /// Visit all direct or virtual bases. | |||
8397 | VisitAllBases | |||
8398 | }; | |||
8399 | ||||
8400 | // Visit the bases and members of the class. | |||
8401 | bool visit(BasesToVisit Bases) { | |||
8402 | CXXRecordDecl *RD = MD->getParent(); | |||
8403 | ||||
8404 | if (Bases == VisitPotentiallyConstructedBases) | |||
8405 | Bases = RD->isAbstract() ? VisitNonVirtualBases : VisitAllBases; | |||
8406 | ||||
8407 | for (auto &B : RD->bases()) | |||
8408 | if ((Bases == VisitDirectBases || !B.isVirtual()) && | |||
8409 | getDerived().visitBase(&B)) | |||
8410 | return true; | |||
8411 | ||||
8412 | if (Bases == VisitAllBases) | |||
8413 | for (auto &B : RD->vbases()) | |||
8414 | if (getDerived().visitBase(&B)) | |||
8415 | return true; | |||
8416 | ||||
8417 | for (auto *F : RD->fields()) | |||
8418 | if (!F->isInvalidDecl() && !F->isUnnamedBitfield() && | |||
8419 | getDerived().visitField(F)) | |||
8420 | return true; | |||
8421 | ||||
8422 | return false; | |||
8423 | } | |||
8424 | }; | |||
8425 | } | |||
8426 | ||||
8427 | namespace { | |||
8428 | struct SpecialMemberDeletionInfo | |||
8429 | : SpecialMemberVisitor<SpecialMemberDeletionInfo> { | |||
8430 | bool Diagnose; | |||
8431 | ||||
8432 | SourceLocation Loc; | |||
8433 | ||||
8434 | bool AllFieldsAreConst; | |||
8435 | ||||
8436 | SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, | |||
8437 | Sema::CXXSpecialMember CSM, | |||
8438 | Sema::InheritedConstructorInfo *ICI, bool Diagnose) | |||
8439 | : SpecialMemberVisitor(S, MD, CSM, ICI), Diagnose(Diagnose), | |||
8440 | Loc(MD->getLocation()), AllFieldsAreConst(true) {} | |||
8441 | ||||
8442 | bool inUnion() const { return MD->getParent()->isUnion(); } | |||
8443 | ||||
8444 | Sema::CXXSpecialMember getEffectiveCSM() { | |||
8445 | return ICI ? Sema::CXXInvalid : CSM; | |||
8446 | } | |||
8447 | ||||
8448 | bool shouldDeleteForVariantObjCPtrMember(FieldDecl *FD, QualType FieldType); | |||
8449 | ||||
8450 | bool visitBase(CXXBaseSpecifier *Base) { return shouldDeleteForBase(Base); } | |||
8451 | bool visitField(FieldDecl *Field) { return shouldDeleteForField(Field); } | |||
8452 | ||||
8453 | bool shouldDeleteForBase(CXXBaseSpecifier *Base); | |||
8454 | bool shouldDeleteForField(FieldDecl *FD); | |||
8455 | bool shouldDeleteForAllConstMembers(); | |||
8456 | ||||
8457 | bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, | |||
8458 | unsigned Quals); | |||
8459 | bool shouldDeleteForSubobjectCall(Subobject Subobj, | |||
8460 | Sema::SpecialMemberOverloadResult SMOR, | |||
8461 | bool IsDtorCallInCtor); | |||
8462 | ||||
8463 | bool isAccessible(Subobject Subobj, CXXMethodDecl *D); | |||
8464 | }; | |||
8465 | } | |||
8466 | ||||
8467 | /// Is the given special member inaccessible when used on the given | |||
8468 | /// sub-object. | |||
8469 | bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, | |||
8470 | CXXMethodDecl *target) { | |||
8471 | /// If we're operating on a base class, the object type is the | |||
8472 | /// type of this special member. | |||
8473 | QualType objectTy; | |||
8474 | AccessSpecifier access = target->getAccess(); | |||
8475 | if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { | |||
8476 | objectTy = S.Context.getTypeDeclType(MD->getParent()); | |||
8477 | access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); | |||
8478 | ||||
8479 | // If we're operating on a field, the object type is the type of the field. | |||
8480 | } else { | |||
8481 | objectTy = S.Context.getTypeDeclType(target->getParent()); | |||
8482 | } | |||
8483 | ||||
8484 | return S.isMemberAccessibleForDeletion( | |||
8485 | target->getParent(), DeclAccessPair::make(target, access), objectTy); | |||
8486 | } | |||
8487 | ||||
8488 | /// Check whether we should delete a special member due to the implicit | |||
8489 | /// definition containing a call to a special member of a subobject. | |||
8490 | bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( | |||
8491 | Subobject Subobj, Sema::SpecialMemberOverloadResult SMOR, | |||
8492 | bool IsDtorCallInCtor) { | |||
8493 | CXXMethodDecl *Decl = SMOR.getMethod(); | |||
8494 | FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); | |||
8495 | ||||
8496 | int DiagKind = -1; | |||
8497 | ||||
8498 | if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) | |||
8499 | DiagKind = !Decl ? 0 : 1; | |||
8500 | else if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) | |||
8501 | DiagKind = 2; | |||
8502 | else if (!isAccessible(Subobj, Decl)) | |||
8503 | DiagKind = 3; | |||
8504 | else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && | |||
8505 | !Decl->isTrivial()) { | |||
8506 | // A member of a union must have a trivial corresponding special member. | |||
8507 | // As a weird special case, a destructor call from a union's constructor | |||
8508 | // must be accessible and non-deleted, but need not be trivial. Such a | |||
8509 | // destructor is never actually called, but is semantically checked as | |||
8510 | // if it were. | |||
8511 | DiagKind = 4; | |||
8512 | } | |||
8513 | ||||
8514 | if (DiagKind == -1) | |||
8515 | return false; | |||
8516 | ||||
8517 | if (Diagnose) { | |||
8518 | if (Field) { | |||
8519 | S.Diag(Field->getLocation(), | |||
8520 | diag::note_deleted_special_member_class_subobject) | |||
8521 | << getEffectiveCSM() << MD->getParent() << /*IsField*/true | |||
8522 | << Field << DiagKind << IsDtorCallInCtor << /*IsObjCPtr*/false; | |||
8523 | } else { | |||
8524 | CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); | |||
8525 | S.Diag(Base->getBeginLoc(), | |||
8526 | diag::note_deleted_special_member_class_subobject) | |||
8527 | << getEffectiveCSM() << MD->getParent() << /*IsField*/ false | |||
8528 | << Base->getType() << DiagKind << IsDtorCallInCtor | |||
8529 | << /*IsObjCPtr*/false; | |||
8530 | } | |||
8531 | ||||
8532 | if (DiagKind == 1) | |||
8533 | S.NoteDeletedFunction(Decl); | |||
8534 | // FIXME: Explain inaccessibility if DiagKind == 3. | |||
8535 | } | |||
8536 | ||||
8537 | return true; | |||
8538 | } | |||
8539 | ||||
8540 | /// Check whether we should delete a special member function due to having a | |||
8541 | /// direct or virtual base class or non-static data member of class type M. | |||
8542 | bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( | |||
8543 | CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { | |||
8544 | FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); | |||
8545 | bool IsMutable = Field && Field->isMutable(); | |||
8546 | ||||
8547 | // C++11 [class.ctor]p5: | |||
8548 | // -- any direct or virtual base class, or non-static data member with no | |||
8549 | // brace-or-equal-initializer, has class type M (or array thereof) and | |||
8550 | // either M has no default constructor or overload resolution as applied | |||
8551 | // to M's default constructor results in an ambiguity or in a function | |||
8552 | // that is deleted or inaccessible | |||
8553 | // C++11 [class.copy]p11, C++11 [class.copy]p23: | |||
8554 | // -- a direct or virtual base class B that cannot be copied/moved because | |||
8555 | // overload resolution, as applied to B's corresponding special member, | |||
8556 | // results in an ambiguity or a function that is deleted or inaccessible | |||
8557 | // from the defaulted special member | |||
8558 | // C++11 [class.dtor]p5: | |||
8559 | // -- any direct or virtual base class [...] has a type with a destructor | |||
8560 | // that is deleted or inaccessible | |||
8561 | if (!(CSM == Sema::CXXDefaultConstructor && | |||
8562 | Field && Field->hasInClassInitializer()) && | |||
8563 | shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals, IsMutable), | |||
8564 | false)) | |||
8565 | return true; | |||
8566 | ||||
8567 | // C++11 [class.ctor]p5, C++11 [class.copy]p11: | |||
8568 | // -- any direct or virtual base class or non-static data member has a | |||
8569 | // type with a destructor that is deleted or inaccessible | |||
8570 | if (IsConstructor) { | |||
8571 | Sema::SpecialMemberOverloadResult SMOR = | |||
8572 | S.LookupSpecialMember(Class, Sema::CXXDestructor, | |||
8573 | false, false, false, false, false); | |||
8574 | if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) | |||
8575 | return true; | |||
8576 | } | |||
8577 | ||||
8578 | return false; | |||
8579 | } | |||
8580 | ||||
8581 | bool SpecialMemberDeletionInfo::shouldDeleteForVariantObjCPtrMember( | |||
8582 | FieldDecl *FD, QualType FieldType) { | |||
8583 | // The defaulted special functions are defined as deleted if this is a variant | |||
8584 | // member with a non-trivial ownership type, e.g., ObjC __strong or __weak | |||
8585 | // type under ARC. | |||
8586 | if (!FieldType.hasNonTrivialObjCLifetime()) | |||
8587 | return false; | |||
8588 | ||||
8589 | // Don't make the defaulted default constructor defined as deleted if the | |||
8590 | // member has an in-class initializer. | |||
8591 | if (CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer()) | |||
8592 | return false; | |||
8593 | ||||
8594 | if (Diagnose) { | |||
8595 | auto *ParentClass = cast<CXXRecordDecl>(FD->getParent()); | |||
8596 | S.Diag(FD->getLocation(), | |||
8597 | diag::note_deleted_special_member_class_subobject) | |||
8598 | << getEffectiveCSM() << ParentClass << /*IsField*/true | |||
8599 | << FD << 4 << /*IsDtorCallInCtor*/false << /*IsObjCPtr*/true; | |||
8600 | } | |||
8601 | ||||
8602 | return true; | |||
8603 | } | |||
8604 | ||||
8605 | /// Check whether we should delete a special member function due to the class | |||
8606 | /// having a particular direct or virtual base class. | |||
8607 | bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { | |||
8608 | CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); | |||
8609 | // If program is correct, BaseClass cannot be null, but if it is, the error | |||
8610 | // must be reported elsewhere. | |||
8611 | if (!BaseClass) | |||
8612 | return false; | |||
8613 | // If we have an inheriting constructor, check whether we're calling an | |||
8614 | // inherited constructor instead of a default constructor. | |||
8615 | Sema::SpecialMemberOverloadResult SMOR = lookupInheritedCtor(BaseClass); | |||
8616 | if (auto *BaseCtor = SMOR.getMethod()) { | |||
8617 | // Note that we do not check access along this path; other than that, | |||
8618 | // this is the same as shouldDeleteForSubobjectCall(Base, BaseCtor, false); | |||
8619 | // FIXME: Check that the base has a usable destructor! Sink this into | |||
8620 | // shouldDeleteForClassSubobject. | |||
8621 | if (BaseCtor->isDeleted() && Diagnose) { | |||
8622 | S.Diag(Base->getBeginLoc(), | |||
8623 | diag::note_deleted_special_member_class_subobject) | |||
8624 | << getEffectiveCSM() << MD->getParent() << /*IsField*/ false | |||
8625 | << Base->getType() << /*Deleted*/ 1 << /*IsDtorCallInCtor*/ false | |||
8626 | << /*IsObjCPtr*/false; | |||
8627 | S.NoteDeletedFunction(BaseCtor); | |||
8628 | } | |||
8629 | return BaseCtor->isDeleted(); | |||
8630 | } | |||
8631 | return shouldDeleteForClassSubobject(BaseClass, Base, 0); | |||
8632 | } | |||
8633 | ||||
8634 | /// Check whether we should delete a special member function due to the class | |||
8635 | /// having a particular non-static data member. | |||
8636 | bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { | |||
8637 | QualType FieldType = S.Context.getBaseElementType(FD->getType()); | |||
8638 | CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); | |||
8639 | ||||
8640 | if (inUnion() && shouldDeleteForVariantObjCPtrMember(FD, FieldType)) | |||
8641 | return true; | |||
8642 | ||||
8643 | if (CSM == Sema::CXXDefaultConstructor) { | |||
8644 | // For a default constructor, all references must be initialized in-class | |||
8645 | // and, if a union, it must have a non-const member. | |||
8646 | if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { | |||
8647 | if (Diagnose) | |||
8648 | S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) | |||
8649 | << !!ICI << MD->getParent() << FD << FieldType << /*Reference*/0; | |||
8650 | return true; | |||
8651 | } | |||
8652 | // C++11 [class.ctor]p5: any non-variant non-static data member of | |||
8653 | // const-qualified type (or array thereof) with no | |||
8654 | // brace-or-equal-initializer does not have a user-provided default | |||
8655 | // constructor. | |||
8656 | if (!inUnion() && FieldType.isConstQualified() && | |||
8657 | !FD->hasInClassInitializer() && | |||
8658 | (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { | |||
8659 | if (Diagnose) | |||
8660 | S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) | |||
8661 | << !!ICI << MD->getParent() << FD << FD->getType() << /*Const*/1; | |||
8662 | return true; | |||
8663 | } | |||
8664 | ||||
8665 | if (inUnion() && !FieldType.isConstQualified()) | |||
8666 | AllFieldsAreConst = false; | |||
8667 | } else if (CSM == Sema::CXXCopyConstructor) { | |||
8668 | // For a copy constructor, data members must not be of rvalue reference | |||
8669 | // type. | |||
8670 | if (FieldType->isRValueReferenceType()) { | |||
8671 | if (Diagnose) | |||
8672 | S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) | |||
8673 | << MD->getParent() << FD << FieldType; | |||
8674 | return true; | |||
8675 | } | |||
8676 | } else if (IsAssignment) { | |||
8677 | // For an assignment operator, data members must not be of reference type. | |||
8678 | if (FieldType->isReferenceType()) { | |||
8679 | if (Diagnose) | |||
8680 | S.Diag(FD->getLocation(), diag::note_deleted_assign_field) | |||
8681 | << isMove() << MD->getParent() << FD << FieldType << /*Reference*/0; | |||
8682 | return true; | |||
8683 | } | |||
8684 | if (!FieldRecord && FieldType.isConstQualified()) { | |||
8685 | // C++11 [class.copy]p23: | |||
8686 | // -- a non-static data member of const non-class type (or array thereof) | |||
8687 | if (Diagnose) | |||
8688 | S.Diag(FD->getLocation(), diag::note_deleted_assign_field) | |||
8689 | << isMove() << MD->getParent() << FD << FD->getType() << /*Const*/1; | |||
8690 | return true; | |||
8691 | } | |||
8692 | } | |||
8693 | ||||
8694 | if (FieldRecord) { | |||
8695 | // Some additional restrictions exist on the variant members. | |||
8696 | if (!inUnion() && FieldRecord->isUnion() && | |||
8697 | FieldRecord->isAnonymousStructOrUnion()) { | |||
8698 | bool AllVariantFieldsAreConst = true; | |||
8699 | ||||
8700 | // FIXME: Handle anonymous unions declared within anonymous unions. | |||
8701 | for (auto *UI : FieldRecord->fields()) { | |||
8702 | QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); | |||
8703 | ||||
8704 | if (shouldDeleteForVariantObjCPtrMember(&*UI, UnionFieldType)) | |||
8705 | return true; | |||
8706 | ||||
8707 | if (!UnionFieldType.isConstQualified()) | |||
8708 | AllVariantFieldsAreConst = false; | |||
8709 | ||||
8710 | CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); | |||
8711 | if (UnionFieldRecord && | |||
8712 | shouldDeleteForClassSubobject(UnionFieldRecord, UI, | |||
8713 | UnionFieldType.getCVRQualifiers())) | |||
8714 | return true; | |||
8715 | } | |||
8716 | ||||
8717 | // At least one member in each anonymous union must be non-const | |||
8718 | if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && | |||
8719 | !FieldRecord->field_empty()) { | |||
8720 | if (Diagnose) | |||
8721 | S.Diag(FieldRecord->getLocation(), | |||
8722 | diag::note_deleted_default_ctor_all_const) | |||
8723 | << !!ICI << MD->getParent() << /*anonymous union*/1; | |||
8724 | return true; | |||
8725 | } | |||
8726 | ||||
8727 | // Don't check the implicit member of the anonymous union type. | |||
8728 | // This is technically non-conformant, but sanity demands it. | |||
8729 | return false; | |||
8730 | } | |||
8731 | ||||
8732 | if (shouldDeleteForClassSubobject(FieldRecord, FD, | |||
8733 | FieldType.getCVRQualifiers())) | |||
8734 | return true; | |||
8735 | } | |||
8736 | ||||
8737 | return false; | |||
8738 | } | |||
8739 | ||||
8740 | /// C++11 [class.ctor] p5: | |||
8741 | /// A defaulted default constructor for a class X is defined as deleted if | |||
8742 | /// X is a union and all of its variant members are of const-qualified type. | |||
8743 | bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { | |||
8744 | // This is a silly definition, because it gives an empty union a deleted | |||
8745 | // default constructor. Don't do that. | |||
8746 | if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst) { | |||
8747 | bool AnyFields = false; | |||
8748 | for (auto *F : MD->getParent()->fields()) | |||
8749 | if ((AnyFields = !F->isUnnamedBitfield())) | |||
8750 | break; | |||
8751 | if (!AnyFields) | |||
8752 | return false; | |||
8753 | if (Diagnose) | |||
8754 | S.Diag(MD->getParent()->getLocation(), | |||
8755 | diag::note_deleted_default_ctor_all_const) | |||
8756 | << !!ICI << MD->getParent() << /*not anonymous union*/0; | |||
8757 | return true; | |||
8758 | } | |||
8759 | return false; | |||
8760 | } | |||
8761 | ||||
8762 | /// Determine whether a defaulted special member function should be defined as | |||
8763 | /// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, | |||
8764 | /// C++11 [class.copy]p23, and C++11 [class.dtor]p5. | |||
8765 | bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, | |||
8766 | InheritedConstructorInfo *ICI, | |||
8767 | bool Diagnose) { | |||
8768 | if (MD->isInvalidDecl()) | |||
8769 | return false; | |||
8770 | CXXRecordDecl *RD = MD->getParent(); | |||
8771 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 8771, __PRETTY_FUNCTION__)); | |||
8772 | if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl()) | |||
8773 | return false; | |||
8774 | ||||
8775 | // C++11 [expr.lambda.prim]p19: | |||
8776 | // The closure type associated with a lambda-expression has a | |||
8777 | // deleted (8.4.3) default constructor and a deleted copy | |||
8778 | // assignment operator. | |||
8779 | // C++2a adds back these operators if the lambda has no lambda-capture. | |||
8780 | if (RD->isLambda() && !RD->lambdaIsDefaultConstructibleAndAssignable() && | |||
8781 | (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { | |||
8782 | if (Diagnose) | |||
8783 | Diag(RD->getLocation(), diag::note_lambda_decl); | |||
8784 | return true; | |||
8785 | } | |||
8786 | ||||
8787 | // For an anonymous struct or union, the copy and assignment special members | |||
8788 | // will never be used, so skip the check. For an anonymous union declared at | |||
8789 | // namespace scope, the constructor and destructor are used. | |||
8790 | if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && | |||
8791 | RD->isAnonymousStructOrUnion()) | |||
8792 | return false; | |||
8793 | ||||
8794 | // C++11 [class.copy]p7, p18: | |||
8795 | // If the class definition declares a move constructor or move assignment | |||
8796 | // operator, an implicitly declared copy constructor or copy assignment | |||
8797 | // operator is defined as deleted. | |||
8798 | if (MD->isImplicit() && | |||
8799 | (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { | |||
8800 | CXXMethodDecl *UserDeclaredMove = nullptr; | |||
8801 | ||||
8802 | // In Microsoft mode up to MSVC 2013, a user-declared move only causes the | |||
8803 | // deletion of the corresponding copy operation, not both copy operations. | |||
8804 | // MSVC 2015 has adopted the standards conforming behavior. | |||
8805 | bool DeletesOnlyMatchingCopy = | |||
8806 | getLangOpts().MSVCCompat && | |||
8807 | !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015); | |||
8808 | ||||
8809 | if (RD->hasUserDeclaredMoveConstructor() && | |||
8810 | (!DeletesOnlyMatchingCopy || CSM == CXXCopyConstructor)) { | |||
8811 | if (!Diagnose) return true; | |||
8812 | ||||
8813 | // Find any user-declared move constructor. | |||
8814 | for (auto *I : RD->ctors()) { | |||
8815 | if (I->isMoveConstructor()) { | |||
8816 | UserDeclaredMove = I; | |||
8817 | break; | |||
8818 | } | |||
8819 | } | |||
8820 | assert(UserDeclaredMove)((UserDeclaredMove) ? static_cast<void> (0) : __assert_fail ("UserDeclaredMove", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 8820, __PRETTY_FUNCTION__)); | |||
8821 | } else if (RD->hasUserDeclaredMoveAssignment() && | |||
8822 | (!DeletesOnlyMatchingCopy || CSM == CXXCopyAssignment)) { | |||
8823 | if (!Diagnose) return true; | |||
8824 | ||||
8825 | // Find any user-declared move assignment operator. | |||
8826 | for (auto *I : RD->methods()) { | |||
8827 | if (I->isMoveAssignmentOperator()) { | |||
8828 | UserDeclaredMove = I; | |||
8829 | break; | |||
8830 | } | |||
8831 | } | |||
8832 | assert(UserDeclaredMove)((UserDeclaredMove) ? static_cast<void> (0) : __assert_fail ("UserDeclaredMove", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 8832, __PRETTY_FUNCTION__)); | |||
8833 | } | |||
8834 | ||||
8835 | if (UserDeclaredMove) { | |||
8836 | Diag(UserDeclaredMove->getLocation(), | |||
8837 | diag::note_deleted_copy_user_declared_move) | |||
8838 | << (CSM == CXXCopyAssignment) << RD | |||
8839 | << UserDeclaredMove->isMoveAssignmentOperator(); | |||
8840 | return true; | |||
8841 | } | |||
8842 | } | |||
8843 | ||||
8844 | // Do access control from the special member function | |||
8845 | ContextRAII MethodContext(*this, MD); | |||
8846 | ||||
8847 | // C++11 [class.dtor]p5: | |||
8848 | // -- for a virtual destructor, lookup of the non-array deallocation function | |||
8849 | // results in an ambiguity or in a function that is deleted or inaccessible | |||
8850 | if (CSM == CXXDestructor && MD->isVirtual()) { | |||
8851 | FunctionDecl *OperatorDelete = nullptr; | |||
8852 | DeclarationName Name = | |||
8853 | Context.DeclarationNames.getCXXOperatorName(OO_Delete); | |||
8854 | if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, | |||
8855 | OperatorDelete, /*Diagnose*/false)) { | |||
8856 | if (Diagnose) | |||
8857 | Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); | |||
8858 | return true; | |||
8859 | } | |||
8860 | } | |||
8861 | ||||
8862 | SpecialMemberDeletionInfo SMI(*this, MD, CSM, ICI, Diagnose); | |||
8863 | ||||
8864 | // Per DR1611, do not consider virtual bases of constructors of abstract | |||
8865 | // classes, since we are not going to construct them. | |||
8866 | // Per DR1658, do not consider virtual bases of destructors of abstract | |||
8867 | // classes either. | |||
8868 | // Per DR2180, for assignment operators we only assign (and thus only | |||
8869 | // consider) direct bases. | |||
8870 | if (SMI.visit(SMI.IsAssignment ? SMI.VisitDirectBases | |||
8871 | : SMI.VisitPotentiallyConstructedBases)) | |||
8872 | return true; | |||
8873 | ||||
8874 | if (SMI.shouldDeleteForAllConstMembers()) | |||
8875 | return true; | |||
8876 | ||||
8877 | if (getLangOpts().CUDA) { | |||
8878 | // We should delete the special member in CUDA mode if target inference | |||
8879 | // failed. | |||
8880 | // For inherited constructors (non-null ICI), CSM may be passed so that MD | |||
8881 | // is treated as certain special member, which may not reflect what special | |||
8882 | // member MD really is. However inferCUDATargetForImplicitSpecialMember | |||
8883 | // expects CSM to match MD, therefore recalculate CSM. | |||
8884 | assert(ICI || CSM == getSpecialMember(MD))((ICI || CSM == getSpecialMember(MD)) ? static_cast<void> (0) : __assert_fail ("ICI || CSM == getSpecialMember(MD)", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 8884, __PRETTY_FUNCTION__)); | |||
8885 | auto RealCSM = CSM; | |||
8886 | if (ICI) | |||
8887 | RealCSM = getSpecialMember(MD); | |||
8888 | ||||
8889 | return inferCUDATargetForImplicitSpecialMember(RD, RealCSM, MD, | |||
8890 | SMI.ConstArg, Diagnose); | |||
8891 | } | |||
8892 | ||||
8893 | return false; | |||
8894 | } | |||
8895 | ||||
8896 | void Sema::DiagnoseDeletedDefaultedFunction(FunctionDecl *FD) { | |||
8897 | DefaultedFunctionKind DFK = getDefaultedFunctionKind(FD); | |||
8898 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 8898, __PRETTY_FUNCTION__)); | |||
8899 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 8899, __PRETTY_FUNCTION__)); | |||
8900 | ||||
8901 | if (DFK.isSpecialMember()) { | |||
8902 | ShouldDeleteSpecialMember(cast<CXXMethodDecl>(FD), DFK.asSpecialMember(), | |||
8903 | nullptr, /*Diagnose=*/true); | |||
8904 | } else { | |||
8905 | DefaultedComparisonAnalyzer( | |||
8906 | *this, cast<CXXRecordDecl>(FD->getLexicalDeclContext()), FD, | |||
8907 | DFK.asComparison(), DefaultedComparisonAnalyzer::ExplainDeleted) | |||
8908 | .visit(); | |||
8909 | } | |||
8910 | } | |||
8911 | ||||
8912 | /// Perform lookup for a special member of the specified kind, and determine | |||
8913 | /// whether it is trivial. If the triviality can be determined without the | |||
8914 | /// lookup, skip it. This is intended for use when determining whether a | |||
8915 | /// special member of a containing object is trivial, and thus does not ever | |||
8916 | /// perform overload resolution for default constructors. | |||
8917 | /// | |||
8918 | /// If \p Selected is not \c NULL, \c *Selected will be filled in with the | |||
8919 | /// member that was most likely to be intended to be trivial, if any. | |||
8920 | /// | |||
8921 | /// If \p ForCall is true, look at CXXRecord::HasTrivialSpecialMembersForCall to | |||
8922 | /// determine whether the special member is trivial. | |||
8923 | static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD, | |||
8924 | Sema::CXXSpecialMember CSM, unsigned Quals, | |||
8925 | bool ConstRHS, | |||
8926 | Sema::TrivialABIHandling TAH, | |||
8927 | CXXMethodDecl **Selected) { | |||
8928 | if (Selected) | |||
8929 | *Selected = nullptr; | |||
8930 | ||||
8931 | switch (CSM) { | |||
8932 | case Sema::CXXInvalid: | |||
8933 | llvm_unreachable("not a special member")::llvm::llvm_unreachable_internal("not a special member", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 8933); | |||
8934 | ||||
8935 | case Sema::CXXDefaultConstructor: | |||
8936 | // C++11 [class.ctor]p5: | |||
8937 | // A default constructor is trivial if: | |||
8938 | // - all the [direct subobjects] have trivial default constructors | |||
8939 | // | |||
8940 | // Note, no overload resolution is performed in this case. | |||
8941 | if (RD->hasTrivialDefaultConstructor()) | |||
8942 | return true; | |||
8943 | ||||
8944 | if (Selected) { | |||
8945 | // If there's a default constructor which could have been trivial, dig it | |||
8946 | // out. Otherwise, if there's any user-provided default constructor, point | |||
8947 | // to that as an example of why there's not a trivial one. | |||
8948 | CXXConstructorDecl *DefCtor = nullptr; | |||
8949 | if (RD->needsImplicitDefaultConstructor()) | |||
8950 | S.DeclareImplicitDefaultConstructor(RD); | |||
8951 | for (auto *CI : RD->ctors()) { | |||
8952 | if (!CI->isDefaultConstructor()) | |||
8953 | continue; | |||
8954 | DefCtor = CI; | |||
8955 | if (!DefCtor->isUserProvided()) | |||
8956 | break; | |||
8957 | } | |||
8958 | ||||
8959 | *Selected = DefCtor; | |||
8960 | } | |||
8961 | ||||
8962 | return false; | |||
8963 | ||||
8964 | case Sema::CXXDestructor: | |||
8965 | // C++11 [class.dtor]p5: | |||
8966 | // A destructor is trivial if: | |||
8967 | // - all the direct [subobjects] have trivial destructors | |||
8968 | if (RD->hasTrivialDestructor() || | |||
8969 | (TAH == Sema::TAH_ConsiderTrivialABI && | |||
8970 | RD->hasTrivialDestructorForCall())) | |||
8971 | return true; | |||
8972 | ||||
8973 | if (Selected) { | |||
8974 | if (RD->needsImplicitDestructor()) | |||
8975 | S.DeclareImplicitDestructor(RD); | |||
8976 | *Selected = RD->getDestructor(); | |||
8977 | } | |||
8978 | ||||
8979 | return false; | |||
8980 | ||||
8981 | case Sema::CXXCopyConstructor: | |||
8982 | // C++11 [class.copy]p12: | |||
8983 | // A copy constructor is trivial if: | |||
8984 | // - the constructor selected to copy each direct [subobject] is trivial | |||
8985 | if (RD->hasTrivialCopyConstructor() || | |||
8986 | (TAH == Sema::TAH_ConsiderTrivialABI && | |||
8987 | RD->hasTrivialCopyConstructorForCall())) { | |||
8988 | if (Quals == Qualifiers::Const) | |||
8989 | // We must either select the trivial copy constructor or reach an | |||
8990 | // ambiguity; no need to actually perform overload resolution. | |||
8991 | return true; | |||
8992 | } else if (!Selected) { | |||
8993 | return false; | |||
8994 | } | |||
8995 | // In C++98, we are not supposed to perform overload resolution here, but we | |||
8996 | // treat that as a language defect, as suggested on cxx-abi-dev, to treat | |||
8997 | // cases like B as having a non-trivial copy constructor: | |||
8998 | // struct A { template<typename T> A(T&); }; | |||
8999 | // struct B { mutable A a; }; | |||
9000 | goto NeedOverloadResolution; | |||
9001 | ||||
9002 | case Sema::CXXCopyAssignment: | |||
9003 | // C++11 [class.copy]p25: | |||
9004 | // A copy assignment operator is trivial if: | |||
9005 | // - the assignment operator selected to copy each direct [subobject] is | |||
9006 | // trivial | |||
9007 | if (RD->hasTrivialCopyAssignment()) { | |||
9008 | if (Quals == Qualifiers::Const) | |||
9009 | return true; | |||
9010 | } else if (!Selected) { | |||
9011 | return false; | |||
9012 | } | |||
9013 | // In C++98, we are not supposed to perform overload resolution here, but we | |||
9014 | // treat that as a language defect. | |||
9015 | goto NeedOverloadResolution; | |||
9016 | ||||
9017 | case Sema::CXXMoveConstructor: | |||
9018 | case Sema::CXXMoveAssignment: | |||
9019 | NeedOverloadResolution: | |||
9020 | Sema::SpecialMemberOverloadResult SMOR = | |||
9021 | lookupCallFromSpecialMember(S, RD, CSM, Quals, ConstRHS); | |||
9022 | ||||
9023 | // The standard doesn't describe how to behave if the lookup is ambiguous. | |||
9024 | // We treat it as not making the member non-trivial, just like the standard | |||
9025 | // mandates for the default constructor. This should rarely matter, because | |||
9026 | // the member will also be deleted. | |||
9027 | if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) | |||
9028 | return true; | |||
9029 | ||||
9030 | if (!SMOR.getMethod()) { | |||
9031 | assert(SMOR.getKind() ==((SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted ) ? static_cast<void> (0) : __assert_fail ("SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 9032, __PRETTY_FUNCTION__)) | |||
9032 | Sema::SpecialMemberOverloadResult::NoMemberOrDeleted)((SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted ) ? static_cast<void> (0) : __assert_fail ("SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 9032, __PRETTY_FUNCTION__)); | |||
9033 | return false; | |||
9034 | } | |||
9035 | ||||
9036 | // We deliberately don't check if we found a deleted special member. We're | |||
9037 | // not supposed to! | |||
9038 | if (Selected) | |||
9039 | *Selected = SMOR.getMethod(); | |||
9040 | ||||
9041 | if (TAH == Sema::TAH_ConsiderTrivialABI && | |||
9042 | (CSM == Sema::CXXCopyConstructor || CSM == Sema::CXXMoveConstructor)) | |||
9043 | return SMOR.getMethod()->isTrivialForCall(); | |||
9044 | return SMOR.getMethod()->isTrivial(); | |||
9045 | } | |||
9046 | ||||
9047 | llvm_unreachable("unknown special method kind")::llvm::llvm_unreachable_internal("unknown special method kind" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 9047); | |||
9048 | } | |||
9049 | ||||
9050 | static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) { | |||
9051 | for (auto *CI : RD->ctors()) | |||
9052 | if (!CI->isImplicit()) | |||
9053 | return CI; | |||
9054 | ||||
9055 | // Look for constructor templates. | |||
9056 | typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter; | |||
9057 | for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) { | |||
9058 | if (CXXConstructorDecl *CD = | |||
9059 | dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl())) | |||
9060 | return CD; | |||
9061 | } | |||
9062 | ||||
9063 | return nullptr; | |||
9064 | } | |||
9065 | ||||
9066 | /// The kind of subobject we are checking for triviality. The values of this | |||
9067 | /// enumeration are used in diagnostics. | |||
9068 | enum TrivialSubobjectKind { | |||
9069 | /// The subobject is a base class. | |||
9070 | TSK_BaseClass, | |||
9071 | /// The subobject is a non-static data member. | |||
9072 | TSK_Field, | |||
9073 | /// The object is actually the complete object. | |||
9074 | TSK_CompleteObject | |||
9075 | }; | |||
9076 | ||||
9077 | /// Check whether the special member selected for a given type would be trivial. | |||
9078 | static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc, | |||
9079 | QualType SubType, bool ConstRHS, | |||
9080 | Sema::CXXSpecialMember CSM, | |||
9081 | TrivialSubobjectKind Kind, | |||
9082 | Sema::TrivialABIHandling TAH, bool Diagnose) { | |||
9083 | CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl(); | |||
9084 | if (!SubRD) | |||
9085 | return true; | |||
9086 | ||||
9087 | CXXMethodDecl *Selected; | |||
9088 | if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(), | |||
9089 | ConstRHS, TAH, Diagnose ? &Selected : nullptr)) | |||
9090 | return true; | |||
9091 | ||||
9092 | if (Diagnose) { | |||
9093 | if (ConstRHS) | |||
9094 | SubType.addConst(); | |||
9095 | ||||
9096 | if (!Selected && CSM == Sema::CXXDefaultConstructor) { | |||
9097 | S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor) | |||
9098 | << Kind << SubType.getUnqualifiedType(); | |||
9099 | if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD)) | |||
9100 | S.Diag(CD->getLocation(), diag::note_user_declared_ctor); | |||
9101 | } else if (!Selected) | |||
9102 | S.Diag(SubobjLoc, diag::note_nontrivial_no_copy) | |||
9103 | << Kind << SubType.getUnqualifiedType() << CSM << SubType; | |||
9104 | else if (Selected->isUserProvided()) { | |||
9105 | if (Kind == TSK_CompleteObject) | |||
9106 | S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided) | |||
9107 | << Kind << SubType.getUnqualifiedType() << CSM; | |||
9108 | else { | |||
9109 | S.Diag(SubobjLoc, diag::note_nontrivial_user_provided) | |||
9110 | << Kind << SubType.getUnqualifiedType() << CSM; | |||
9111 | S.Diag(Selected->getLocation(), diag::note_declared_at); | |||
9112 | } | |||
9113 | } else { | |||
9114 | if (Kind != TSK_CompleteObject) | |||
9115 | S.Diag(SubobjLoc, diag::note_nontrivial_subobject) | |||
9116 | << Kind << SubType.getUnqualifiedType() << CSM; | |||
9117 | ||||
9118 | // Explain why the defaulted or deleted special member isn't trivial. | |||
9119 | S.SpecialMemberIsTrivial(Selected, CSM, Sema::TAH_IgnoreTrivialABI, | |||
9120 | Diagnose); | |||
9121 | } | |||
9122 | } | |||
9123 | ||||
9124 | return false; | |||
9125 | } | |||
9126 | ||||
9127 | /// Check whether the members of a class type allow a special member to be | |||
9128 | /// trivial. | |||
9129 | static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD, | |||
9130 | Sema::CXXSpecialMember CSM, | |||
9131 | bool ConstArg, | |||
9132 | Sema::TrivialABIHandling TAH, | |||
9133 | bool Diagnose) { | |||
9134 | for (const auto *FI : RD->fields()) { | |||
9135 | if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) | |||
9136 | continue; | |||
9137 | ||||
9138 | QualType FieldType = S.Context.getBaseElementType(FI->getType()); | |||
9139 | ||||
9140 | // Pretend anonymous struct or union members are members of this class. | |||
9141 | if (FI->isAnonymousStructOrUnion()) { | |||
9142 | if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(), | |||
9143 | CSM, ConstArg, TAH, Diagnose)) | |||
9144 | return false; | |||
9145 | continue; | |||
9146 | } | |||
9147 | ||||
9148 | // C++11 [class.ctor]p5: | |||
9149 | // A default constructor is trivial if [...] | |||
9150 | // -- no non-static data member of its class has a | |||
9151 | // brace-or-equal-initializer | |||
9152 | if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) { | |||
9153 | if (Diagnose) | |||
9154 | S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << FI; | |||
9155 | return false; | |||
9156 | } | |||
9157 | ||||
9158 | // Objective C ARC 4.3.5: | |||
9159 | // [...] nontrivally ownership-qualified types are [...] not trivially | |||
9160 | // default constructible, copy constructible, move constructible, copy | |||
9161 | // assignable, move assignable, or destructible [...] | |||
9162 | if (FieldType.hasNonTrivialObjCLifetime()) { | |||
9163 | if (Diagnose) | |||
9164 | S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership) | |||
9165 | << RD << FieldType.getObjCLifetime(); | |||
9166 | return false; | |||
9167 | } | |||
9168 | ||||
9169 | bool ConstRHS = ConstArg && !FI->isMutable(); | |||
9170 | if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, ConstRHS, | |||
9171 | CSM, TSK_Field, TAH, Diagnose)) | |||
9172 | return false; | |||
9173 | } | |||
9174 | ||||
9175 | return true; | |||
9176 | } | |||
9177 | ||||
9178 | /// Diagnose why the specified class does not have a trivial special member of | |||
9179 | /// the given kind. | |||
9180 | void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) { | |||
9181 | QualType Ty = Context.getRecordType(RD); | |||
9182 | ||||
9183 | bool ConstArg = (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment); | |||
9184 | checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, ConstArg, CSM, | |||
9185 | TSK_CompleteObject, TAH_IgnoreTrivialABI, | |||
9186 | /*Diagnose*/true); | |||
9187 | } | |||
9188 | ||||
9189 | /// Determine whether a defaulted or deleted special member function is trivial, | |||
9190 | /// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12, | |||
9191 | /// C++11 [class.copy]p25, and C++11 [class.dtor]p5. | |||
9192 | bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM, | |||
9193 | TrivialABIHandling TAH, bool Diagnose) { | |||
9194 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 9194, __PRETTY_FUNCTION__)); | |||
9195 | ||||
9196 | CXXRecordDecl *RD = MD->getParent(); | |||
9197 | ||||
9198 | bool ConstArg = false; | |||
9199 | ||||
9200 | // C++11 [class.copy]p12, p25: [DR1593] | |||
9201 | // A [special member] is trivial if [...] its parameter-type-list is | |||
9202 | // equivalent to the parameter-type-list of an implicit declaration [...] | |||
9203 | switch (CSM) { | |||
9204 | case CXXDefaultConstructor: | |||
9205 | case CXXDestructor: | |||
9206 | // Trivial default constructors and destructors cannot have parameters. | |||
9207 | break; | |||
9208 | ||||
9209 | case CXXCopyConstructor: | |||
9210 | case CXXCopyAssignment: { | |||
9211 | // Trivial copy operations always have const, non-volatile parameter types. | |||
9212 | ConstArg = true; | |||
9213 | const ParmVarDecl *Param0 = MD->getParamDecl(0); | |||
9214 | const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>(); | |||
9215 | if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) { | |||
9216 | if (Diagnose) | |||
9217 | Diag(Param0->getLocation(), diag::note_nontrivial_param_type) | |||
9218 | << Param0->getSourceRange() << Param0->getType() | |||
9219 | << Context.getLValueReferenceType( | |||
9220 | Context.getRecordType(RD).withConst()); | |||
9221 | return false; | |||
9222 | } | |||
9223 | break; | |||
9224 | } | |||
9225 | ||||
9226 | case CXXMoveConstructor: | |||
9227 | case CXXMoveAssignment: { | |||
9228 | // Trivial move operations always have non-cv-qualified parameters. | |||
9229 | const ParmVarDecl *Param0 = MD->getParamDecl(0); | |||
9230 | const RValueReferenceType *RT = | |||
9231 | Param0->getType()->getAs<RValueReferenceType>(); | |||
9232 | if (!RT || RT->getPointeeType().getCVRQualifiers()) { | |||
9233 | if (Diagnose) | |||
9234 | Diag(Param0->getLocation(), diag::note_nontrivial_param_type) | |||
9235 | << Param0->getSourceRange() << Param0->getType() | |||
9236 | << Context.getRValueReferenceType(Context.getRecordType(RD)); | |||
9237 | return false; | |||
9238 | } | |||
9239 | break; | |||
9240 | } | |||
9241 | ||||
9242 | case CXXInvalid: | |||
9243 | llvm_unreachable("not a special member")::llvm::llvm_unreachable_internal("not a special member", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 9243); | |||
9244 | } | |||
9245 | ||||
9246 | if (MD->getMinRequiredArguments() < MD->getNumParams()) { | |||
9247 | if (Diagnose) | |||
9248 | Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(), | |||
9249 | diag::note_nontrivial_default_arg) | |||
9250 | << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange(); | |||
9251 | return false; | |||
9252 | } | |||
9253 | if (MD->isVariadic()) { | |||
9254 | if (Diagnose) | |||
9255 | Diag(MD->getLocation(), diag::note_nontrivial_variadic); | |||
9256 | return false; | |||
9257 | } | |||
9258 | ||||
9259 | // C++11 [class.ctor]p5, C++11 [class.dtor]p5: | |||
9260 | // A copy/move [constructor or assignment operator] is trivial if | |||
9261 | // -- the [member] selected to copy/move each direct base class subobject | |||
9262 | // is trivial | |||
9263 | // | |||
9264 | // C++11 [class.copy]p12, C++11 [class.copy]p25: | |||
9265 | // A [default constructor or destructor] is trivial if | |||
9266 | // -- all the direct base classes have trivial [default constructors or | |||
9267 | // destructors] | |||
9268 | for (const auto &BI : RD->bases()) | |||
9269 | if (!checkTrivialSubobjectCall(*this, BI.getBeginLoc(), BI.getType(), | |||
9270 | ConstArg, CSM, TSK_BaseClass, TAH, Diagnose)) | |||
9271 | return false; | |||
9272 | ||||
9273 | // C++11 [class.ctor]p5, C++11 [class.dtor]p5: | |||
9274 | // A copy/move [constructor or assignment operator] for a class X is | |||
9275 | // trivial if | |||
9276 | // -- for each non-static data member of X that is of class type (or array | |||
9277 | // thereof), the constructor selected to copy/move that member is | |||
9278 | // trivial | |||
9279 | // | |||
9280 | // C++11 [class.copy]p12, C++11 [class.copy]p25: | |||
9281 | // A [default constructor or destructor] is trivial if | |||
9282 | // -- for all of the non-static data members of its class that are of class | |||
9283 | // type (or array thereof), each such class has a trivial [default | |||
9284 | // constructor or destructor] | |||
9285 | if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, TAH, Diagnose)) | |||
9286 | return false; | |||
9287 | ||||
9288 | // C++11 [class.dtor]p5: | |||
9289 | // A destructor is trivial if [...] | |||
9290 | // -- the destructor is not virtual | |||
9291 | if (CSM == CXXDestructor && MD->isVirtual()) { | |||
9292 | if (Diagnose) | |||
9293 | Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD; | |||
9294 | return false; | |||
9295 | } | |||
9296 | ||||
9297 | // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25: | |||
9298 | // A [special member] for class X is trivial if [...] | |||
9299 | // -- class X has no virtual functions and no virtual base classes | |||
9300 | if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) { | |||
9301 | if (!Diagnose) | |||
9302 | return false; | |||
9303 | ||||
9304 | if (RD->getNumVBases()) { | |||
9305 | // Check for virtual bases. We already know that the corresponding | |||
9306 | // member in all bases is trivial, so vbases must all be direct. | |||
9307 | CXXBaseSpecifier &BS = *RD->vbases_begin(); | |||
9308 | assert(BS.isVirtual())((BS.isVirtual()) ? static_cast<void> (0) : __assert_fail ("BS.isVirtual()", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 9308, __PRETTY_FUNCTION__)); | |||
9309 | Diag(BS.getBeginLoc(), diag::note_nontrivial_has_virtual) << RD << 1; | |||
9310 | return false; | |||
9311 | } | |||
9312 | ||||
9313 | // Must have a virtual method. | |||
9314 | for (const auto *MI : RD->methods()) { | |||
9315 | if (MI->isVirtual()) { | |||
9316 | SourceLocation MLoc = MI->getBeginLoc(); | |||
9317 | Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0; | |||
9318 | return false; | |||
9319 | } | |||
9320 | } | |||
9321 | ||||
9322 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 9322); | |||
9323 | } | |||
9324 | ||||
9325 | // Looks like it's trivial! | |||
9326 | return true; | |||
9327 | } | |||
9328 | ||||
9329 | namespace { | |||
9330 | struct FindHiddenVirtualMethod { | |||
9331 | Sema *S; | |||
9332 | CXXMethodDecl *Method; | |||
9333 | llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; | |||
9334 | SmallVector<CXXMethodDecl *, 8> OverloadedMethods; | |||
9335 | ||||
9336 | private: | |||
9337 | /// Check whether any most overridden method from MD in Methods | |||
9338 | static bool CheckMostOverridenMethods( | |||
9339 | const CXXMethodDecl *MD, | |||
9340 | const llvm::SmallPtrSetImpl<const CXXMethodDecl *> &Methods) { | |||
9341 | if (MD->size_overridden_methods() == 0) | |||
9342 | return Methods.count(MD->getCanonicalDecl()); | |||
9343 | for (const CXXMethodDecl *O : MD->overridden_methods()) | |||
9344 | if (CheckMostOverridenMethods(O, Methods)) | |||
9345 | return true; | |||
9346 | return false; | |||
9347 | } | |||
9348 | ||||
9349 | public: | |||
9350 | /// Member lookup function that determines whether a given C++ | |||
9351 | /// method overloads virtual methods in a base class without overriding any, | |||
9352 | /// to be used with CXXRecordDecl::lookupInBases(). | |||
9353 | bool operator()(const CXXBaseSpecifier *Specifier, CXXBasePath &Path) { | |||
9354 | RecordDecl *BaseRecord = | |||
9355 | Specifier->getType()->castAs<RecordType>()->getDecl(); | |||
9356 | ||||
9357 | DeclarationName Name = Method->getDeclName(); | |||
9358 | assert(Name.getNameKind() == DeclarationName::Identifier)((Name.getNameKind() == DeclarationName::Identifier) ? static_cast <void> (0) : __assert_fail ("Name.getNameKind() == DeclarationName::Identifier" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 9358, __PRETTY_FUNCTION__)); | |||
9359 | ||||
9360 | bool foundSameNameMethod = false; | |||
9361 | SmallVector<CXXMethodDecl *, 8> overloadedMethods; | |||
9362 | for (Path.Decls = BaseRecord->lookup(Name); !Path.Decls.empty(); | |||
9363 | Path.Decls = Path.Decls.slice(1)) { | |||
9364 | NamedDecl *D = Path.Decls.front(); | |||
9365 | if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { | |||
9366 | MD = MD->getCanonicalDecl(); | |||
9367 | foundSameNameMethod = true; | |||
9368 | // Interested only in hidden virtual methods. | |||
9369 | if (!MD->isVirtual()) | |||
9370 | continue; | |||
9371 | // If the method we are checking overrides a method from its base | |||
9372 | // don't warn about the other overloaded methods. Clang deviates from | |||
9373 | // GCC by only diagnosing overloads of inherited virtual functions that | |||
9374 | // do not override any other virtual functions in the base. GCC's | |||
9375 | // -Woverloaded-virtual diagnoses any derived function hiding a virtual | |||
9376 | // function from a base class. These cases may be better served by a | |||
9377 | // warning (not specific to virtual functions) on call sites when the | |||
9378 | // call would select a different function from the base class, were it | |||
9379 | // visible. | |||
9380 | // See FIXME in test/SemaCXX/warn-overload-virtual.cpp for an example. | |||
9381 | if (!S->IsOverload(Method, MD, false)) | |||
9382 | return true; | |||
9383 | // Collect the overload only if its hidden. | |||
9384 | if (!CheckMostOverridenMethods(MD, OverridenAndUsingBaseMethods)) | |||
9385 | overloadedMethods.push_back(MD); | |||
9386 | } | |||
9387 | } | |||
9388 | ||||
9389 | if (foundSameNameMethod) | |||
9390 | OverloadedMethods.append(overloadedMethods.begin(), | |||
9391 | overloadedMethods.end()); | |||
9392 | return foundSameNameMethod; | |||
9393 | } | |||
9394 | }; | |||
9395 | } // end anonymous namespace | |||
9396 | ||||
9397 | /// Add the most overriden methods from MD to Methods | |||
9398 | static void AddMostOverridenMethods(const CXXMethodDecl *MD, | |||
9399 | llvm::SmallPtrSetImpl<const CXXMethodDecl *>& Methods) { | |||
9400 | if (MD->size_overridden_methods() == 0) | |||
9401 | Methods.insert(MD->getCanonicalDecl()); | |||
9402 | else | |||
9403 | for (const CXXMethodDecl *O : MD->overridden_methods()) | |||
9404 | AddMostOverridenMethods(O, Methods); | |||
9405 | } | |||
9406 | ||||
9407 | /// Check if a method overloads virtual methods in a base class without | |||
9408 | /// overriding any. | |||
9409 | void Sema::FindHiddenVirtualMethods(CXXMethodDecl *MD, | |||
9410 | SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) { | |||
9411 | if (!MD->getDeclName().isIdentifier()) | |||
9412 | return; | |||
9413 | ||||
9414 | CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. | |||
9415 | /*bool RecordPaths=*/false, | |||
9416 | /*bool DetectVirtual=*/false); | |||
9417 | FindHiddenVirtualMethod FHVM; | |||
9418 | FHVM.Method = MD; | |||
9419 | FHVM.S = this; | |||
9420 | ||||
9421 | // Keep the base methods that were overridden or introduced in the subclass | |||
9422 | // by 'using' in a set. A base method not in this set is hidden. | |||
9423 | CXXRecordDecl *DC = MD->getParent(); | |||
9424 | DeclContext::lookup_result R = DC->lookup(MD->getDeclName()); | |||
9425 | for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) { | |||
9426 | NamedDecl *ND = *I; | |||
9427 | if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I)) | |||
9428 | ND = shad->getTargetDecl(); | |||
9429 | if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) | |||
9430 | AddMostOverridenMethods(MD, FHVM.OverridenAndUsingBaseMethods); | |||
9431 | } | |||
9432 | ||||
9433 | if (DC->lookupInBases(FHVM, Paths)) | |||
9434 | OverloadedMethods = FHVM.OverloadedMethods; | |||
9435 | } | |||
9436 | ||||
9437 | void Sema::NoteHiddenVirtualMethods(CXXMethodDecl *MD, | |||
9438 | SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) { | |||
9439 | for (unsigned i = 0, e = OverloadedMethods.size(); i != e; ++i) { | |||
9440 | CXXMethodDecl *overloadedMD = OverloadedMethods[i]; | |||
9441 | PartialDiagnostic PD = PDiag( | |||
9442 | diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; | |||
9443 | HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType()); | |||
9444 | Diag(overloadedMD->getLocation(), PD); | |||
9445 | } | |||
9446 | } | |||
9447 | ||||
9448 | /// Diagnose methods which overload virtual methods in a base class | |||
9449 | /// without overriding any. | |||
9450 | void Sema::DiagnoseHiddenVirtualMethods(CXXMethodDecl *MD) { | |||
9451 | if (MD->isInvalidDecl()) | |||
9452 | return; | |||
9453 | ||||
9454 | if (Diags.isIgnored(diag::warn_overloaded_virtual, MD->getLocation())) | |||
9455 | return; | |||
9456 | ||||
9457 | SmallVector<CXXMethodDecl *, 8> OverloadedMethods; | |||
9458 | FindHiddenVirtualMethods(MD, OverloadedMethods); | |||
9459 | if (!OverloadedMethods.empty()) { | |||
9460 | Diag(MD->getLocation(), diag::warn_overloaded_virtual) | |||
9461 | << MD << (OverloadedMethods.size() > 1); | |||
9462 | ||||
9463 | NoteHiddenVirtualMethods(MD, OverloadedMethods); | |||
9464 | } | |||
9465 | } | |||
9466 | ||||
9467 | void Sema::checkIllFormedTrivialABIStruct(CXXRecordDecl &RD) { | |||
9468 | auto PrintDiagAndRemoveAttr = [&]() { | |||
9469 | // No diagnostics if this is a template instantiation. | |||
9470 | if (!isTemplateInstantiation(RD.getTemplateSpecializationKind())) | |||
9471 | Diag(RD.getAttr<TrivialABIAttr>()->getLocation(), | |||
9472 | diag::ext_cannot_use_trivial_abi) << &RD; | |||
9473 | RD.dropAttr<TrivialABIAttr>(); | |||
9474 | }; | |||
9475 | ||||
9476 | // Ill-formed if the struct has virtual functions. | |||
9477 | if (RD.isPolymorphic()) { | |||
9478 | PrintDiagAndRemoveAttr(); | |||
9479 | return; | |||
9480 | } | |||
9481 | ||||
9482 | for (const auto &B : RD.bases()) { | |||
9483 | // Ill-formed if the base class is non-trivial for the purpose of calls or a | |||
9484 | // virtual base. | |||
9485 | if ((!B.getType()->isDependentType() && | |||
9486 | !B.getType()->getAsCXXRecordDecl()->canPassInRegisters()) || | |||
9487 | B.isVirtual()) { | |||
9488 | PrintDiagAndRemoveAttr(); | |||
9489 | return; | |||
9490 | } | |||
9491 | } | |||
9492 | ||||
9493 | for (const auto *FD : RD.fields()) { | |||
9494 | // Ill-formed if the field is an ObjectiveC pointer or of a type that is | |||
9495 | // non-trivial for the purpose of calls. | |||
9496 | QualType FT = FD->getType(); | |||
9497 | if (FT.getObjCLifetime() == Qualifiers::OCL_Weak) { | |||
9498 | PrintDiagAndRemoveAttr(); | |||
9499 | return; | |||
9500 | } | |||
9501 | ||||
9502 | if (const auto *RT = FT->getBaseElementTypeUnsafe()->getAs<RecordType>()) | |||
9503 | if (!RT->isDependentType() && | |||
9504 | !cast<CXXRecordDecl>(RT->getDecl())->canPassInRegisters()) { | |||
9505 | PrintDiagAndRemoveAttr(); | |||
9506 | return; | |||
9507 | } | |||
9508 | } | |||
9509 | } | |||
9510 | ||||
9511 | void Sema::ActOnFinishCXXMemberSpecification( | |||
9512 | Scope *S, SourceLocation RLoc, Decl *TagDecl, SourceLocation LBrac, | |||
9513 | SourceLocation RBrac, const ParsedAttributesView &AttrList) { | |||
9514 | if (!TagDecl) | |||
9515 | return; | |||
9516 | ||||
9517 | AdjustDeclIfTemplate(TagDecl); | |||
9518 | ||||
9519 | for (const ParsedAttr &AL : AttrList) { | |||
9520 | if (AL.getKind() != ParsedAttr::AT_Visibility) | |||
9521 | continue; | |||
9522 | AL.setInvalid(); | |||
9523 | Diag(AL.getLoc(), diag::warn_attribute_after_definition_ignored) << AL; | |||
9524 | } | |||
9525 | ||||
9526 | ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( | |||
9527 | // strict aliasing violation! | |||
9528 | reinterpret_cast<Decl**>(FieldCollector->getCurFields()), | |||
9529 | FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); | |||
9530 | ||||
9531 | CheckCompletedCXXClass(S, cast<CXXRecordDecl>(TagDecl)); | |||
9532 | } | |||
9533 | ||||
9534 | /// Find the equality comparison functions that should be implicitly declared | |||
9535 | /// in a given class definition, per C++2a [class.compare.default]p3. | |||
9536 | static void findImplicitlyDeclaredEqualityComparisons( | |||
9537 | ASTContext &Ctx, CXXRecordDecl *RD, | |||
9538 | llvm::SmallVectorImpl<FunctionDecl *> &Spaceships) { | |||
9539 | DeclarationName EqEq = Ctx.DeclarationNames.getCXXOperatorName(OO_EqualEqual); | |||
9540 | if (!RD->lookup(EqEq).empty()) | |||
9541 | // Member operator== explicitly declared: no implicit operator==s. | |||
9542 | return; | |||
9543 | ||||
9544 | // Traverse friends looking for an '==' or a '<=>'. | |||
9545 | for (FriendDecl *Friend : RD->friends()) { | |||
9546 | FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(Friend->getFriendDecl()); | |||
9547 | if (!FD) continue; | |||
9548 | ||||
9549 | if (FD->getOverloadedOperator() == OO_EqualEqual) { | |||
9550 | // Friend operator== explicitly declared: no implicit operator==s. | |||
9551 | Spaceships.clear(); | |||
9552 | return; | |||
9553 | } | |||
9554 | ||||
9555 | if (FD->getOverloadedOperator() == OO_Spaceship && | |||
9556 | FD->isExplicitlyDefaulted()) | |||
9557 | Spaceships.push_back(FD); | |||
9558 | } | |||
9559 | ||||
9560 | // Look for members named 'operator<=>'. | |||
9561 | DeclarationName Cmp = Ctx.DeclarationNames.getCXXOperatorName(OO_Spaceship); | |||
9562 | for (NamedDecl *ND : RD->lookup(Cmp)) { | |||
9563 | // Note that we could find a non-function here (either a function template | |||
9564 | // or a using-declaration). Neither case results in an implicit | |||
9565 | // 'operator=='. | |||
9566 | if (auto *FD = dyn_cast<FunctionDecl>(ND)) | |||
9567 | if (FD->isExplicitlyDefaulted()) | |||
9568 | Spaceships.push_back(FD); | |||
9569 | } | |||
9570 | } | |||
9571 | ||||
9572 | /// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared | |||
9573 | /// special functions, such as the default constructor, copy | |||
9574 | /// constructor, or destructor, to the given C++ class (C++ | |||
9575 | /// [special]p1). This routine can only be executed just before the | |||
9576 | /// definition of the class is complete. | |||
9577 | void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { | |||
9578 | if (ClassDecl->needsImplicitDefaultConstructor()) { | |||
9579 | ++getASTContext().NumImplicitDefaultConstructors; | |||
9580 | ||||
9581 | if (ClassDecl->hasInheritedConstructor()) | |||
9582 | DeclareImplicitDefaultConstructor(ClassDecl); | |||
9583 | } | |||
9584 | ||||
9585 | if (ClassDecl->needsImplicitCopyConstructor()) { | |||
9586 | ++getASTContext().NumImplicitCopyConstructors; | |||
9587 | ||||
9588 | // If the properties or semantics of the copy constructor couldn't be | |||
9589 | // determined while the class was being declared, force a declaration | |||
9590 | // of it now. | |||
9591 | if (ClassDecl->needsOverloadResolutionForCopyConstructor() || | |||
9592 | ClassDecl->hasInheritedConstructor()) | |||
9593 | DeclareImplicitCopyConstructor(ClassDecl); | |||
9594 | // For the MS ABI we need to know whether the copy ctor is deleted. A | |||
9595 | // prerequisite for deleting the implicit copy ctor is that the class has a | |||
9596 | // move ctor or move assignment that is either user-declared or whose | |||
9597 | // semantics are inherited from a subobject. FIXME: We should provide a more | |||
9598 | // direct way for CodeGen to ask whether the constructor was deleted. | |||
9599 | else if (Context.getTargetInfo().getCXXABI().isMicrosoft() && | |||
9600 | (ClassDecl->hasUserDeclaredMoveConstructor() || | |||
9601 | ClassDecl->needsOverloadResolutionForMoveConstructor() || | |||
9602 | ClassDecl->hasUserDeclaredMoveAssignment() || | |||
9603 | ClassDecl->needsOverloadResolutionForMoveAssignment())) | |||
9604 | DeclareImplicitCopyConstructor(ClassDecl); | |||
9605 | } | |||
9606 | ||||
9607 | if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) { | |||
9608 | ++getASTContext().NumImplicitMoveConstructors; | |||
9609 | ||||
9610 | if (ClassDecl->needsOverloadResolutionForMoveConstructor() || | |||
9611 | ClassDecl->hasInheritedConstructor()) | |||
9612 | DeclareImplicitMoveConstructor(ClassDecl); | |||
9613 | } | |||
9614 | ||||
9615 | if (ClassDecl->needsImplicitCopyAssignment()) { | |||
9616 | ++getASTContext().NumImplicitCopyAssignmentOperators; | |||
9617 | ||||
9618 | // If we have a dynamic class, then the copy assignment operator may be | |||
9619 | // virtual, so we have to declare it immediately. This ensures that, e.g., | |||
9620 | // it shows up in the right place in the vtable and that we diagnose | |||
9621 | // problems with the implicit exception specification. | |||
9622 | if (ClassDecl->isDynamicClass() || | |||
9623 | ClassDecl->needsOverloadResolutionForCopyAssignment() || | |||
9624 | ClassDecl->hasInheritedAssignment()) | |||
9625 | DeclareImplicitCopyAssignment(ClassDecl); | |||
9626 | } | |||
9627 | ||||
9628 | if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) { | |||
9629 | ++getASTContext().NumImplicitMoveAssignmentOperators; | |||
9630 | ||||
9631 | // Likewise for the move assignment operator. | |||
9632 | if (ClassDecl->isDynamicClass() || | |||
9633 | ClassDecl->needsOverloadResolutionForMoveAssignment() || | |||
9634 | ClassDecl->hasInheritedAssignment()) | |||
9635 | DeclareImplicitMoveAssignment(ClassDecl); | |||
9636 | } | |||
9637 | ||||
9638 | if (ClassDecl->needsImplicitDestructor()) { | |||
9639 | ++getASTContext().NumImplicitDestructors; | |||
9640 | ||||
9641 | // If we have a dynamic class, then the destructor may be virtual, so we | |||
9642 | // have to declare the destructor immediately. This ensures that, e.g., it | |||
9643 | // shows up in the right place in the vtable and that we diagnose problems | |||
9644 | // with the implicit exception specification. | |||
9645 | if (ClassDecl->isDynamicClass() || | |||
9646 | ClassDecl->needsOverloadResolutionForDestructor()) | |||
9647 | DeclareImplicitDestructor(ClassDecl); | |||
9648 | } | |||
9649 | ||||
9650 | // C++2a [class.compare.default]p3: | |||
9651 | // If the member-specification does not explicitly declare any member or | |||
9652 | // friend named operator==, an == operator function is declared implicitly | |||
9653 | // for each defaulted three-way comparison operator function defined in the | |||
9654 | // member-specification | |||
9655 | // FIXME: Consider doing this lazily. | |||
9656 | if (getLangOpts().CPlusPlus2a) { | |||
9657 | llvm::SmallVector<FunctionDecl*, 4> DefaultedSpaceships; | |||
9658 | findImplicitlyDeclaredEqualityComparisons(Context, ClassDecl, | |||
9659 | DefaultedSpaceships); | |||
9660 | for (auto *FD : DefaultedSpaceships) | |||
9661 | DeclareImplicitEqualityComparison(ClassDecl, FD); | |||
9662 | } | |||
9663 | } | |||
9664 | ||||
9665 | unsigned Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { | |||
9666 | if (!D) | |||
9667 | return 0; | |||
9668 | ||||
9669 | // The order of template parameters is not important here. All names | |||
9670 | // get added to the same scope. | |||
9671 | SmallVector<TemplateParameterList *, 4> ParameterLists; | |||
9672 | ||||
9673 | if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) | |||
9674 | D = TD->getTemplatedDecl(); | |||
9675 | ||||
9676 | if (auto *PSD = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) | |||
9677 | ParameterLists.push_back(PSD->getTemplateParameters()); | |||
9678 | ||||
9679 | if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)) { | |||
9680 | for (unsigned i = 0; i < DD->getNumTemplateParameterLists(); ++i) | |||
9681 | ParameterLists.push_back(DD->getTemplateParameterList(i)); | |||
9682 | ||||
9683 | if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { | |||
9684 | if (FunctionTemplateDecl *FTD = FD->getDescribedFunctionTemplate()) | |||
9685 | ParameterLists.push_back(FTD->getTemplateParameters()); | |||
9686 | } | |||
9687 | } | |||
9688 | ||||
9689 | if (TagDecl *TD = dyn_cast<TagDecl>(D)) { | |||
9690 | for (unsigned i = 0; i < TD->getNumTemplateParameterLists(); ++i) | |||
9691 | ParameterLists.push_back(TD->getTemplateParameterList(i)); | |||
9692 | ||||
9693 | if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) { | |||
9694 | if (ClassTemplateDecl *CTD = RD->getDescribedClassTemplate()) | |||
9695 | ParameterLists.push_back(CTD->getTemplateParameters()); | |||
9696 | } | |||
9697 | } | |||
9698 | ||||
9699 | unsigned Count = 0; | |||
9700 | for (TemplateParameterList *Params : ParameterLists) { | |||
9701 | if (Params->size() > 0) | |||
9702 | // Ignore explicit specializations; they don't contribute to the template | |||
9703 | // depth. | |||
9704 | ++Count; | |||
9705 | for (NamedDecl *Param : *Params) { | |||
9706 | if (Param->getDeclName()) { | |||
9707 | S->AddDecl(Param); | |||
9708 | IdResolver.AddDecl(Param); | |||
9709 | } | |||
9710 | } | |||
9711 | } | |||
9712 | ||||
9713 | return Count; | |||
9714 | } | |||
9715 | ||||
9716 | void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { | |||
9717 | if (!RecordD) return; | |||
9718 | AdjustDeclIfTemplate(RecordD); | |||
9719 | CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); | |||
9720 | PushDeclContext(S, Record); | |||
9721 | } | |||
9722 | ||||
9723 | void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { | |||
9724 | if (!RecordD) return; | |||
9725 | PopDeclContext(); | |||
9726 | } | |||
9727 | ||||
9728 | /// This is used to implement the constant expression evaluation part of the | |||
9729 | /// attribute enable_if extension. There is nothing in standard C++ which would | |||
9730 | /// require reentering parameters. | |||
9731 | void Sema::ActOnReenterCXXMethodParameter(Scope *S, ParmVarDecl *Param) { | |||
9732 | if (!Param) | |||
9733 | return; | |||
9734 | ||||
9735 | S->AddDecl(Param); | |||
9736 | if (Param->getDeclName()) | |||
9737 | IdResolver.AddDecl(Param); | |||
9738 | } | |||
9739 | ||||
9740 | /// ActOnStartDelayedCXXMethodDeclaration - We have completed | |||
9741 | /// parsing a top-level (non-nested) C++ class, and we are now | |||
9742 | /// parsing those parts of the given Method declaration that could | |||
9743 | /// not be parsed earlier (C++ [class.mem]p2), such as default | |||
9744 | /// arguments. This action should enter the scope of the given | |||
9745 | /// Method declaration as if we had just parsed the qualified method | |||
9746 | /// name. However, it should not bring the parameters into scope; | |||
9747 | /// that will be performed by ActOnDelayedCXXMethodParameter. | |||
9748 | void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { | |||
9749 | } | |||
9750 | ||||
9751 | /// ActOnDelayedCXXMethodParameter - We've already started a delayed | |||
9752 | /// C++ method declaration. We're (re-)introducing the given | |||
9753 | /// function parameter into scope for use in parsing later parts of | |||
9754 | /// the method declaration. For example, we could see an | |||
9755 | /// ActOnParamDefaultArgument event for this parameter. | |||
9756 | void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { | |||
9757 | if (!ParamD) | |||
9758 | return; | |||
9759 | ||||
9760 | ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); | |||
9761 | ||||
9762 | // If this parameter has an unparsed default argument, clear it out | |||
9763 | // to make way for the parsed default argument. | |||
9764 | if (Param->hasUnparsedDefaultArg()) | |||
9765 | Param->setDefaultArg(nullptr); | |||
9766 | ||||
9767 | S->AddDecl(Param); | |||
9768 | if (Param->getDeclName()) | |||
9769 | IdResolver.AddDecl(Param); | |||
9770 | } | |||
9771 | ||||
9772 | /// ActOnFinishDelayedCXXMethodDeclaration - We have finished | |||
9773 | /// processing the delayed method declaration for Method. The method | |||
9774 | /// declaration is now considered finished. There may be a separate | |||
9775 | /// ActOnStartOfFunctionDef action later (not necessarily | |||
9776 | /// immediately!) for this method, if it was also defined inside the | |||
9777 | /// class body. | |||
9778 | void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { | |||
9779 | if (!MethodD) | |||
9780 | return; | |||
9781 | ||||
9782 | AdjustDeclIfTemplate(MethodD); | |||
9783 | ||||
9784 | FunctionDecl *Method = cast<FunctionDecl>(MethodD); | |||
9785 | ||||
9786 | // Now that we have our default arguments, check the constructor | |||
9787 | // again. It could produce additional diagnostics or affect whether | |||
9788 | // the class has implicitly-declared destructors, among other | |||
9789 | // things. | |||
9790 | if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) | |||
9791 | CheckConstructor(Constructor); | |||
9792 | ||||
9793 | // Check the default arguments, which we may have added. | |||
9794 | if (!Method->isInvalidDecl()) | |||
9795 | CheckCXXDefaultArguments(Method); | |||
9796 | } | |||
9797 | ||||
9798 | // Emit the given diagnostic for each non-address-space qualifier. | |||
9799 | // Common part of CheckConstructorDeclarator and CheckDestructorDeclarator. | |||
9800 | static void checkMethodTypeQualifiers(Sema &S, Declarator &D, unsigned DiagID) { | |||
9801 | const DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); | |||
9802 | if (FTI.hasMethodTypeQualifiers() && !D.isInvalidType()) { | |||
9803 | bool DiagOccured = false; | |||
9804 | FTI.MethodQualifiers->forEachQualifier( | |||
9805 | [DiagID, &S, &DiagOccured](DeclSpec::TQ, StringRef QualName, | |||
9806 | SourceLocation SL) { | |||
9807 | // This diagnostic should be emitted on any qualifier except an addr | |||
9808 | // space qualifier. However, forEachQualifier currently doesn't visit | |||
9809 | // addr space qualifiers, so there's no way to write this condition | |||
9810 | // right now; we just diagnose on everything. | |||
9811 | S.Diag(SL, DiagID) << QualName << SourceRange(SL); | |||
9812 | DiagOccured = true; | |||
9813 | }); | |||
9814 | if (DiagOccured) | |||
9815 | D.setInvalidType(); | |||
9816 | } | |||
9817 | } | |||
9818 | ||||
9819 | /// CheckConstructorDeclarator - Called by ActOnDeclarator to check | |||
9820 | /// the well-formedness of the constructor declarator @p D with type @p | |||
9821 | /// R. If there are any errors in the declarator, this routine will | |||
9822 | /// emit diagnostics and set the invalid bit to true. In any case, the type | |||
9823 | /// will be updated to reflect a well-formed type for the constructor and | |||
9824 | /// returned. | |||
9825 | QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, | |||
9826 | StorageClass &SC) { | |||
9827 | bool isVirtual = D.getDeclSpec().isVirtualSpecified(); | |||
9828 | ||||
9829 | // C++ [class.ctor]p3: | |||
9830 | // A constructor shall not be virtual (10.3) or static (9.4). A | |||
9831 | // constructor can be invoked for a const, volatile or const | |||
9832 | // volatile object. A constructor shall not be declared const, | |||
9833 | // volatile, or const volatile (9.3.2). | |||
9834 | if (isVirtual) { | |||
9835 | if (!D.isInvalidType()) | |||
9836 | Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) | |||
9837 | << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) | |||
9838 | << SourceRange(D.getIdentifierLoc()); | |||
9839 | D.setInvalidType(); | |||
9840 | } | |||
9841 | if (SC == SC_Static) { | |||
9842 | if (!D.isInvalidType()) | |||
9843 | Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) | |||
9844 | << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) | |||
9845 | << SourceRange(D.getIdentifierLoc()); | |||
9846 | D.setInvalidType(); | |||
9847 | SC = SC_None; | |||
9848 | } | |||
9849 | ||||
9850 | if (unsigned TypeQuals = D.getDeclSpec().getTypeQualifiers()) { | |||
9851 | diagnoseIgnoredQualifiers( | |||
9852 | diag::err_constructor_return_type, TypeQuals, SourceLocation(), | |||
9853 | D.getDeclSpec().getConstSpecLoc(), D.getDeclSpec().getVolatileSpecLoc(), | |||
9854 | D.getDeclSpec().getRestrictSpecLoc(), | |||
9855 | D.getDeclSpec().getAtomicSpecLoc()); | |||
9856 | D.setInvalidType(); | |||
9857 | } | |||
9858 | ||||
9859 | checkMethodTypeQualifiers(*this, D, diag::err_invalid_qualified_constructor); | |||
9860 | ||||
9861 | // C++0x [class.ctor]p4: | |||
9862 | // A constructor shall not be declared with a ref-qualifier. | |||
9863 | DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); | |||
9864 | if (FTI.hasRefQualifier()) { | |||
9865 | Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) | |||
9866 | << FTI.RefQualifierIsLValueRef | |||
9867 | << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); | |||
9868 | D.setInvalidType(); | |||
9869 | } | |||
9870 | ||||
9871 | // Rebuild the function type "R" without any type qualifiers (in | |||
9872 | // case any of the errors above fired) and with "void" as the | |||
9873 | // return type, since constructors don't have return types. | |||
9874 | const FunctionProtoType *Proto = R->castAs<FunctionProtoType>(); | |||
9875 | if (Proto->getReturnType() == Context.VoidTy && !D.isInvalidType()) | |||
9876 | return R; | |||
9877 | ||||
9878 | FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); | |||
9879 | EPI.TypeQuals = Qualifiers(); | |||
9880 | EPI.RefQualifier = RQ_None; | |||
9881 | ||||
9882 | return Context.getFunctionType(Context.VoidTy, Proto->getParamTypes(), EPI); | |||
9883 | } | |||
9884 | ||||
9885 | /// CheckConstructor - Checks a fully-formed constructor for | |||
9886 | /// well-formedness, issuing any diagnostics required. Returns true if | |||
9887 | /// the constructor declarator is invalid. | |||
9888 | void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { | |||
9889 | CXXRecordDecl *ClassDecl | |||
9890 | = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); | |||
9891 | if (!ClassDecl) | |||
9892 | return Constructor->setInvalidDecl(); | |||
9893 | ||||
9894 | // C++ [class.copy]p3: | |||
9895 | // A declaration of a constructor for a class X is ill-formed if | |||
9896 | // its first parameter is of type (optionally cv-qualified) X and | |||
9897 | // either there are no other parameters or else all other | |||
9898 | // parameters have default arguments. | |||
9899 | if (!Constructor->isInvalidDecl() && | |||
9900 | ((Constructor->getNumParams() == 1) || | |||
9901 | (Constructor->getNumParams() > 1 && | |||
9902 | Constructor->getParamDecl(1)->hasDefaultArg())) && | |||
9903 | Constructor->getTemplateSpecializationKind() | |||
9904 | != TSK_ImplicitInstantiation) { | |||
9905 | QualType ParamType = Constructor->getParamDecl(0)->getType(); | |||
9906 | QualType ClassTy = Context.getTagDeclType(ClassDecl); | |||
9907 | if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { | |||
9908 | SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); | |||
9909 | const char *ConstRef | |||
9910 | = Constructor->getParamDecl(0)->getIdentifier() ? "const &" | |||
9911 | : " const &"; | |||
9912 | Diag(ParamLoc, diag::err_constructor_byvalue_arg) | |||
9913 | << FixItHint::CreateInsertion(ParamLoc, ConstRef); | |||
9914 | ||||
9915 | // FIXME: Rather that making the constructor invalid, we should endeavor | |||
9916 | // to fix the type. | |||
9917 | Constructor->setInvalidDecl(); | |||
9918 | } | |||
9919 | } | |||
9920 | } | |||
9921 | ||||
9922 | /// CheckDestructor - Checks a fully-formed destructor definition for | |||
9923 | /// well-formedness, issuing any diagnostics required. Returns true | |||
9924 | /// on error. | |||
9925 | bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { | |||
9926 | CXXRecordDecl *RD = Destructor->getParent(); | |||
9927 | ||||
9928 | if (!Destructor->getOperatorDelete() && Destructor->isVirtual()) { | |||
9929 | SourceLocation Loc; | |||
9930 | ||||
9931 | if (!Destructor->isImplicit()) | |||
9932 | Loc = Destructor->getLocation(); | |||
9933 | else | |||
9934 | Loc = RD->getLocation(); | |||
9935 | ||||
9936 | // If we have a virtual destructor, look up the deallocation function | |||
9937 | if (FunctionDecl *OperatorDelete = | |||
9938 | FindDeallocationFunctionForDestructor(Loc, RD)) { | |||
9939 | Expr *ThisArg = nullptr; | |||
9940 | ||||
9941 | // If the notional 'delete this' expression requires a non-trivial | |||
9942 | // conversion from 'this' to the type of a destroying operator delete's | |||
9943 | // first parameter, perform that conversion now. | |||
9944 | if (OperatorDelete->isDestroyingOperatorDelete()) { | |||
9945 | QualType ParamType = OperatorDelete->getParamDecl(0)->getType(); | |||
9946 | if (!declaresSameEntity(ParamType->getAsCXXRecordDecl(), RD)) { | |||
9947 | // C++ [class.dtor]p13: | |||
9948 | // ... as if for the expression 'delete this' appearing in a | |||
9949 | // non-virtual destructor of the destructor's class. | |||
9950 | ContextRAII SwitchContext(*this, Destructor); | |||
9951 | ExprResult This = | |||
9952 | ActOnCXXThis(OperatorDelete->getParamDecl(0)->getLocation()); | |||
9953 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 9953, __PRETTY_FUNCTION__)); | |||
9954 | This = PerformImplicitConversion(This.get(), ParamType, AA_Passing); | |||
9955 | if (This.isInvalid()) { | |||
9956 | // FIXME: Register this as a context note so that it comes out | |||
9957 | // in the right order. | |||
9958 | Diag(Loc, diag::note_implicit_delete_this_in_destructor_here); | |||
9959 | return true; | |||
9960 | } | |||
9961 | ThisArg = This.get(); | |||
9962 | } | |||
9963 | } | |||
9964 | ||||
9965 | DiagnoseUseOfDecl(OperatorDelete, Loc); | |||
9966 | MarkFunctionReferenced(Loc, OperatorDelete); | |||
9967 | Destructor->setOperatorDelete(OperatorDelete, ThisArg); | |||
9968 | } | |||
9969 | } | |||
9970 | ||||
9971 | return false; | |||
9972 | } | |||
9973 | ||||
9974 | /// CheckDestructorDeclarator - Called by ActOnDeclarator to check | |||
9975 | /// the well-formednes of the destructor declarator @p D with type @p | |||
9976 | /// R. If there are any errors in the declarator, this routine will | |||
9977 | /// emit diagnostics and set the declarator to invalid. Even if this happens, | |||
9978 | /// will be updated to reflect a well-formed type for the destructor and | |||
9979 | /// returned. | |||
9980 | QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, | |||
9981 | StorageClass& SC) { | |||
9982 | // C++ [class.dtor]p1: | |||
9983 | // [...] A typedef-name that names a class is a class-name | |||
9984 | // (7.1.3); however, a typedef-name that names a class shall not | |||
9985 | // be used as the identifier in the declarator for a destructor | |||
9986 | // declaration. | |||
9987 | QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); | |||
9988 | if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) | |||
9989 | Diag(D.getIdentifierLoc(), diag::ext_destructor_typedef_name) | |||
9990 | << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); | |||
9991 | else if (const TemplateSpecializationType *TST = | |||
9992 | DeclaratorType->getAs<TemplateSpecializationType>()) | |||
9993 | if (TST->isTypeAlias()) | |||
9994 | Diag(D.getIdentifierLoc(), diag::ext_destructor_typedef_name) | |||
9995 | << DeclaratorType << 1; | |||
9996 | ||||
9997 | // C++ [class.dtor]p2: | |||
9998 | // A destructor is used to destroy objects of its class type. A | |||
9999 | // destructor takes no parameters, and no return type can be | |||
10000 | // specified for it (not even void). The address of a destructor | |||
10001 | // shall not be taken. A destructor shall not be static. A | |||
10002 | // destructor can be invoked for a const, volatile or const | |||
10003 | // volatile object. A destructor shall not be declared const, | |||
10004 | // volatile or const volatile (9.3.2). | |||
10005 | if (SC == SC_Static) { | |||
10006 | if (!D.isInvalidType()) | |||
10007 | Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) | |||
10008 | << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) | |||
10009 | << SourceRange(D.getIdentifierLoc()) | |||
10010 | << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); | |||
10011 | ||||
10012 | SC = SC_None; | |||
10013 | } | |||
10014 | if (!D.isInvalidType()) { | |||
10015 | // Destructors don't have return types, but the parser will | |||
10016 | // happily parse something like: | |||
10017 | // | |||
10018 | // class X { | |||
10019 | // float ~X(); | |||
10020 | // }; | |||
10021 | // | |||
10022 | // The return type will be eliminated later. | |||
10023 | if (D.getDeclSpec().hasTypeSpecifier()) | |||
10024 | Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) | |||
10025 | << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) | |||
10026 | << SourceRange(D.getIdentifierLoc()); | |||
10027 | else if (unsigned TypeQuals = D.getDeclSpec().getTypeQualifiers()) { | |||
10028 | diagnoseIgnoredQualifiers(diag::err_destructor_return_type, TypeQuals, | |||
10029 | SourceLocation(), | |||
10030 | D.getDeclSpec().getConstSpecLoc(), | |||
10031 | D.getDeclSpec().getVolatileSpecLoc(), | |||
10032 | D.getDeclSpec().getRestrictSpecLoc(), | |||
10033 | D.getDeclSpec().getAtomicSpecLoc()); | |||
10034 | D.setInvalidType(); | |||
10035 | } | |||
10036 | } | |||
10037 | ||||
10038 | checkMethodTypeQualifiers(*this, D, diag::err_invalid_qualified_destructor); | |||
10039 | ||||
10040 | // C++0x [class.dtor]p2: | |||
10041 | // A destructor shall not be declared with a ref-qualifier. | |||
10042 | DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); | |||
10043 | if (FTI.hasRefQualifier()) { | |||
10044 | Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) | |||
10045 | << FTI.RefQualifierIsLValueRef | |||
10046 | << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); | |||
10047 | D.setInvalidType(); | |||
10048 | } | |||
10049 | ||||
10050 | // Make sure we don't have any parameters. | |||
10051 | if (FTIHasNonVoidParameters(FTI)) { | |||
10052 | Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); | |||
10053 | ||||
10054 | // Delete the parameters. | |||
10055 | FTI.freeParams(); | |||
10056 | D.setInvalidType(); | |||
10057 | } | |||
10058 | ||||
10059 | // Make sure the destructor isn't variadic. | |||
10060 | if (FTI.isVariadic) { | |||
10061 | Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); | |||
10062 | D.setInvalidType(); | |||
10063 | } | |||
10064 | ||||
10065 | // Rebuild the function type "R" without any type qualifiers or | |||
10066 | // parameters (in case any of the errors above fired) and with | |||
10067 | // "void" as the return type, since destructors don't have return | |||
10068 | // types. | |||
10069 | if (!D.isInvalidType()) | |||
10070 | return R; | |||
10071 | ||||
10072 | const FunctionProtoType *Proto = R->castAs<FunctionProtoType>(); | |||
10073 | FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); | |||
10074 | EPI.Variadic = false; | |||
10075 | EPI.TypeQuals = Qualifiers(); | |||
10076 | EPI.RefQualifier = RQ_None; | |||
10077 | return Context.getFunctionType(Context.VoidTy, None, EPI); | |||
10078 | } | |||
10079 | ||||
10080 | static void extendLeft(SourceRange &R, SourceRange Before) { | |||
10081 | if (Before.isInvalid()) | |||
10082 | return; | |||
10083 | R.setBegin(Before.getBegin()); | |||
10084 | if (R.getEnd().isInvalid()) | |||
10085 | R.setEnd(Before.getEnd()); | |||
10086 | } | |||
10087 | ||||
10088 | static void extendRight(SourceRange &R, SourceRange After) { | |||
10089 | if (After.isInvalid()) | |||
10090 | return; | |||
10091 | if (R.getBegin().isInvalid()) | |||
10092 | R.setBegin(After.getBegin()); | |||
10093 | R.setEnd(After.getEnd()); | |||
10094 | } | |||
10095 | ||||
10096 | /// CheckConversionDeclarator - Called by ActOnDeclarator to check the | |||
10097 | /// well-formednes of the conversion function declarator @p D with | |||
10098 | /// type @p R. If there are any errors in the declarator, this routine | |||
10099 | /// will emit diagnostics and return true. Otherwise, it will return | |||
10100 | /// false. Either way, the type @p R will be updated to reflect a | |||
10101 | /// well-formed type for the conversion operator. | |||
10102 | void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, | |||
10103 | StorageClass& SC) { | |||
10104 | // C++ [class.conv.fct]p1: | |||
10105 | // Neither parameter types nor return type can be specified. The | |||
10106 | // type of a conversion function (8.3.5) is "function taking no | |||
10107 | // parameter returning conversion-type-id." | |||
10108 | if (SC == SC_Static) { | |||
10109 | if (!D.isInvalidType()) | |||
10110 | Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) | |||
10111 | << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) | |||
10112 | << D.getName().getSourceRange(); | |||
10113 | D.setInvalidType(); | |||
10114 | SC = SC_None; | |||
10115 | } | |||
10116 | ||||
10117 | TypeSourceInfo *ConvTSI = nullptr; | |||
10118 | QualType ConvType = | |||
10119 | GetTypeFromParser(D.getName().ConversionFunctionId, &ConvTSI); | |||
10120 | ||||
10121 | const DeclSpec &DS = D.getDeclSpec(); | |||
10122 | if (DS.hasTypeSpecifier() && !D.isInvalidType()) { | |||
10123 | // Conversion functions don't have return types, but the parser will | |||
10124 | // happily parse something like: | |||
10125 | // | |||
10126 | // class X { | |||
10127 | // float operator bool(); | |||
10128 | // }; | |||
10129 | // | |||
10130 | // The return type will be changed later anyway. | |||
10131 | Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) | |||
10132 | << SourceRange(DS.getTypeSpecTypeLoc()) | |||
10133 | << SourceRange(D.getIdentifierLoc()); | |||
10134 | D.setInvalidType(); | |||
10135 | } else if (DS.getTypeQualifiers() && !D.isInvalidType()) { | |||
10136 | // It's also plausible that the user writes type qualifiers in the wrong | |||
10137 | // place, such as: | |||
10138 | // struct S { const operator int(); }; | |||
10139 | // FIXME: we could provide a fixit to move the qualifiers onto the | |||
10140 | // conversion type. | |||
10141 | Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) | |||
10142 | << SourceRange(D.getIdentifierLoc()) << 0; | |||
10143 | D.setInvalidType(); | |||
10144 | } | |||
10145 | ||||
10146 | const auto *Proto = R->castAs<FunctionProtoType>(); | |||
10147 | ||||
10148 | // Make sure we don't have any parameters. | |||
10149 | if (Proto->getNumParams() > 0) { | |||
10150 | Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); | |||
10151 | ||||
10152 | // Delete the parameters. | |||
10153 | D.getFunctionTypeInfo().freeParams(); | |||
10154 | D.setInvalidType(); | |||
10155 | } else if (Proto->isVariadic()) { | |||
10156 | Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); | |||
10157 | D.setInvalidType(); | |||
10158 | } | |||
10159 | ||||
10160 | // Diagnose "&operator bool()" and other such nonsense. This | |||
10161 | // is actually a gcc extension which we don't support. | |||
10162 | if (Proto->getReturnType() != ConvType) { | |||
10163 | bool NeedsTypedef = false; | |||
10164 | SourceRange Before, After; | |||
10165 | ||||
10166 | // Walk the chunks and extract information on them for our diagnostic. | |||
10167 | bool PastFunctionChunk = false; | |||
10168 | for (auto &Chunk : D.type_objects()) { | |||
10169 | switch (Chunk.Kind) { | |||
10170 | case DeclaratorChunk::Function: | |||
10171 | if (!PastFunctionChunk) { | |||
10172 | if (Chunk.Fun.HasTrailingReturnType) { | |||
10173 | TypeSourceInfo *TRT = nullptr; | |||
10174 | GetTypeFromParser(Chunk.Fun.getTrailingReturnType(), &TRT); | |||
10175 | if (TRT) extendRight(After, TRT->getTypeLoc().getSourceRange()); | |||
10176 | } | |||
10177 | PastFunctionChunk = true; | |||
10178 | break; | |||
10179 | } | |||
10180 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
10181 | case DeclaratorChunk::Array: | |||
10182 | NeedsTypedef = true; | |||
10183 | extendRight(After, Chunk.getSourceRange()); | |||
10184 | break; | |||
10185 | ||||
10186 | case DeclaratorChunk::Pointer: | |||
10187 | case DeclaratorChunk::BlockPointer: | |||
10188 | case DeclaratorChunk::Reference: | |||
10189 | case DeclaratorChunk::MemberPointer: | |||
10190 | case DeclaratorChunk::Pipe: | |||
10191 | extendLeft(Before, Chunk.getSourceRange()); | |||
10192 | break; | |||
10193 | ||||
10194 | case DeclaratorChunk::Paren: | |||
10195 | extendLeft(Before, Chunk.Loc); | |||
10196 | extendRight(After, Chunk.EndLoc); | |||
10197 | break; | |||
10198 | } | |||
10199 | } | |||
10200 | ||||
10201 | SourceLocation Loc = Before.isValid() ? Before.getBegin() : | |||
10202 | After.isValid() ? After.getBegin() : | |||
10203 | D.getIdentifierLoc(); | |||
10204 | auto &&DB = Diag(Loc, diag::err_conv_function_with_complex_decl); | |||
10205 | DB << Before << After; | |||
10206 | ||||
10207 | if (!NeedsTypedef) { | |||
10208 | DB << /*don't need a typedef*/0; | |||
10209 | ||||
10210 | // If we can provide a correct fix-it hint, do so. | |||
10211 | if (After.isInvalid() && ConvTSI) { | |||
10212 | SourceLocation InsertLoc = | |||
10213 | getLocForEndOfToken(ConvTSI->getTypeLoc().getEndLoc()); | |||
10214 | DB << FixItHint::CreateInsertion(InsertLoc, " ") | |||
10215 | << FixItHint::CreateInsertionFromRange( | |||
10216 | InsertLoc, CharSourceRange::getTokenRange(Before)) | |||
10217 | << FixItHint::CreateRemoval(Before); | |||
10218 | } | |||
10219 | } else if (!Proto->getReturnType()->isDependentType()) { | |||
10220 | DB << /*typedef*/1 << Proto->getReturnType(); | |||
10221 | } else if (getLangOpts().CPlusPlus11) { | |||
10222 | DB << /*alias template*/2 << Proto->getReturnType(); | |||
10223 | } else { | |||
10224 | DB << /*might not be fixable*/3; | |||
10225 | } | |||
10226 | ||||
10227 | // Recover by incorporating the other type chunks into the result type. | |||
10228 | // Note, this does *not* change the name of the function. This is compatible | |||
10229 | // with the GCC extension: | |||
10230 | // struct S { &operator int(); } s; | |||
10231 | // int &r = s.operator int(); // ok in GCC | |||
10232 | // S::operator int&() {} // error in GCC, function name is 'operator int'. | |||
10233 | ConvType = Proto->getReturnType(); | |||
10234 | } | |||
10235 | ||||
10236 | // C++ [class.conv.fct]p4: | |||
10237 | // The conversion-type-id shall not represent a function type nor | |||
10238 | // an array type. | |||
10239 | if (ConvType->isArrayType()) { | |||
10240 | Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); | |||
10241 | ConvType = Context.getPointerType(ConvType); | |||
10242 | D.setInvalidType(); | |||
10243 | } else if (ConvType->isFunctionType()) { | |||
10244 | Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); | |||
10245 | ConvType = Context.getPointerType(ConvType); | |||
10246 | D.setInvalidType(); | |||
10247 | } | |||
10248 | ||||
10249 | // Rebuild the function type "R" without any parameters (in case any | |||
10250 | // of the errors above fired) and with the conversion type as the | |||
10251 | // return type. | |||
10252 | if (D.isInvalidType()) | |||
10253 | R = Context.getFunctionType(ConvType, None, Proto->getExtProtoInfo()); | |||
10254 | ||||
10255 | // C++0x explicit conversion operators. | |||
10256 | if (DS.hasExplicitSpecifier() && !getLangOpts().CPlusPlus2a) | |||
10257 | Diag(DS.getExplicitSpecLoc(), | |||
10258 | getLangOpts().CPlusPlus11 | |||
10259 | ? diag::warn_cxx98_compat_explicit_conversion_functions | |||
10260 | : diag::ext_explicit_conversion_functions) | |||
10261 | << SourceRange(DS.getExplicitSpecRange()); | |||
10262 | } | |||
10263 | ||||
10264 | /// ActOnConversionDeclarator - Called by ActOnDeclarator to complete | |||
10265 | /// the declaration of the given C++ conversion function. This routine | |||
10266 | /// is responsible for recording the conversion function in the C++ | |||
10267 | /// class, if possible. | |||
10268 | Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { | |||
10269 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 10269, __PRETTY_FUNCTION__)); | |||
10270 | ||||
10271 | CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); | |||
10272 | ||||
10273 | // Make sure we aren't redeclaring the conversion function. | |||
10274 | QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); | |||
10275 | ||||
10276 | // C++ [class.conv.fct]p1: | |||
10277 | // [...] A conversion function is never used to convert a | |||
10278 | // (possibly cv-qualified) object to the (possibly cv-qualified) | |||
10279 | // same object type (or a reference to it), to a (possibly | |||
10280 | // cv-qualified) base class of that type (or a reference to it), | |||
10281 | // or to (possibly cv-qualified) void. | |||
10282 | // FIXME: Suppress this warning if the conversion function ends up being a | |||
10283 | // virtual function that overrides a virtual function in a base class. | |||
10284 | QualType ClassType | |||
10285 | = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); | |||
10286 | if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) | |||
10287 | ConvType = ConvTypeRef->getPointeeType(); | |||
10288 | if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && | |||
10289 | Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) | |||
10290 | /* Suppress diagnostics for instantiations. */; | |||
10291 | else if (ConvType->isRecordType()) { | |||
10292 | ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); | |||
10293 | if (ConvType == ClassType) | |||
10294 | Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) | |||
10295 | << ClassType; | |||
10296 | else if (IsDerivedFrom(Conversion->getLocation(), ClassType, ConvType)) | |||
10297 | Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) | |||
10298 | << ClassType << ConvType; | |||
10299 | } else if (ConvType->isVoidType()) { | |||
10300 | Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) | |||
10301 | << ClassType << ConvType; | |||
10302 | } | |||
10303 | ||||
10304 | if (FunctionTemplateDecl *ConversionTemplate | |||
10305 | = Conversion->getDescribedFunctionTemplate()) | |||
10306 | return ConversionTemplate; | |||
10307 | ||||
10308 | return Conversion; | |||
10309 | } | |||
10310 | ||||
10311 | namespace { | |||
10312 | /// Utility class to accumulate and print a diagnostic listing the invalid | |||
10313 | /// specifier(s) on a declaration. | |||
10314 | struct BadSpecifierDiagnoser { | |||
10315 | BadSpecifierDiagnoser(Sema &S, SourceLocation Loc, unsigned DiagID) | |||
10316 | : S(S), Diagnostic(S.Diag(Loc, DiagID)) {} | |||
10317 | ~BadSpecifierDiagnoser() { | |||
10318 | Diagnostic << Specifiers; | |||
10319 | } | |||
10320 | ||||
10321 | template<typename T> void check(SourceLocation SpecLoc, T Spec) { | |||
10322 | return check(SpecLoc, DeclSpec::getSpecifierName(Spec)); | |||
10323 | } | |||
10324 | void check(SourceLocation SpecLoc, DeclSpec::TST Spec) { | |||
10325 | return check(SpecLoc, | |||
10326 | DeclSpec::getSpecifierName(Spec, S.getPrintingPolicy())); | |||
10327 | } | |||
10328 | void check(SourceLocation SpecLoc, const char *Spec) { | |||
10329 | if (SpecLoc.isInvalid()) return; | |||
10330 | Diagnostic << SourceRange(SpecLoc, SpecLoc); | |||
10331 | if (!Specifiers.empty()) Specifiers += " "; | |||
10332 | Specifiers += Spec; | |||
10333 | } | |||
10334 | ||||
10335 | Sema &S; | |||
10336 | Sema::SemaDiagnosticBuilder Diagnostic; | |||
10337 | std::string Specifiers; | |||
10338 | }; | |||
10339 | } | |||
10340 | ||||
10341 | /// Check the validity of a declarator that we parsed for a deduction-guide. | |||
10342 | /// These aren't actually declarators in the grammar, so we need to check that | |||
10343 | /// the user didn't specify any pieces that are not part of the deduction-guide | |||
10344 | /// grammar. | |||
10345 | void Sema::CheckDeductionGuideDeclarator(Declarator &D, QualType &R, | |||
10346 | StorageClass &SC) { | |||
10347 | TemplateName GuidedTemplate = D.getName().TemplateName.get().get(); | |||
10348 | TemplateDecl *GuidedTemplateDecl = GuidedTemplate.getAsTemplateDecl(); | |||
10349 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 10349, __PRETTY_FUNCTION__)); | |||
10350 | ||||
10351 | // C++ [temp.deduct.guide]p3: | |||
10352 | // A deduction-gide shall be declared in the same scope as the | |||
10353 | // corresponding class template. | |||
10354 | if (!CurContext->getRedeclContext()->Equals( | |||
10355 | GuidedTemplateDecl->getDeclContext()->getRedeclContext())) { | |||
10356 | Diag(D.getIdentifierLoc(), diag::err_deduction_guide_wrong_scope) | |||
10357 | << GuidedTemplateDecl; | |||
10358 | Diag(GuidedTemplateDecl->getLocation(), diag::note_template_decl_here); | |||
10359 | } | |||
10360 | ||||
10361 | auto &DS = D.getMutableDeclSpec(); | |||
10362 | // We leave 'friend' and 'virtual' to be rejected in the normal way. | |||
10363 | if (DS.hasTypeSpecifier() || DS.getTypeQualifiers() || | |||
10364 | DS.getStorageClassSpecLoc().isValid() || DS.isInlineSpecified() || | |||
10365 | DS.isNoreturnSpecified() || DS.hasConstexprSpecifier()) { | |||
10366 | BadSpecifierDiagnoser Diagnoser( | |||
10367 | *this, D.getIdentifierLoc(), | |||
10368 | diag::err_deduction_guide_invalid_specifier); | |||
10369 | ||||
10370 | Diagnoser.check(DS.getStorageClassSpecLoc(), DS.getStorageClassSpec()); | |||
10371 | DS.ClearStorageClassSpecs(); | |||
10372 | SC = SC_None; | |||
10373 | ||||
10374 | // 'explicit' is permitted. | |||
10375 | Diagnoser.check(DS.getInlineSpecLoc(), "inline"); | |||
10376 | Diagnoser.check(DS.getNoreturnSpecLoc(), "_Noreturn"); | |||
10377 | Diagnoser.check(DS.getConstexprSpecLoc(), "constexpr"); | |||
10378 | DS.ClearConstexprSpec(); | |||
10379 | ||||
10380 | Diagnoser.check(DS.getConstSpecLoc(), "const"); | |||
10381 | Diagnoser.check(DS.getRestrictSpecLoc(), "__restrict"); | |||
10382 | Diagnoser.check(DS.getVolatileSpecLoc(), "volatile"); | |||
10383 | Diagnoser.check(DS.getAtomicSpecLoc(), "_Atomic"); | |||
10384 | Diagnoser.check(DS.getUnalignedSpecLoc(), "__unaligned"); | |||
10385 | DS.ClearTypeQualifiers(); | |||
10386 | ||||
10387 | Diagnoser.check(DS.getTypeSpecComplexLoc(), DS.getTypeSpecComplex()); | |||
10388 | Diagnoser.check(DS.getTypeSpecSignLoc(), DS.getTypeSpecSign()); | |||
10389 | Diagnoser.check(DS.getTypeSpecWidthLoc(), DS.getTypeSpecWidth()); | |||
10390 | Diagnoser.check(DS.getTypeSpecTypeLoc(), DS.getTypeSpecType()); | |||
10391 | DS.ClearTypeSpecType(); | |||
10392 | } | |||
10393 | ||||
10394 | if (D.isInvalidType()) | |||
10395 | return; | |||
10396 | ||||
10397 | // Check the declarator is simple enough. | |||
10398 | bool FoundFunction = false; | |||
10399 | for (const DeclaratorChunk &Chunk : llvm::reverse(D.type_objects())) { | |||
10400 | if (Chunk.Kind == DeclaratorChunk::Paren) | |||
10401 | continue; | |||
10402 | if (Chunk.Kind != DeclaratorChunk::Function || FoundFunction) { | |||
10403 | Diag(D.getDeclSpec().getBeginLoc(), | |||
10404 | diag::err_deduction_guide_with_complex_decl) | |||
10405 | << D.getSourceRange(); | |||
10406 | break; | |||
10407 | } | |||
10408 | if (!Chunk.Fun.hasTrailingReturnType()) { | |||
10409 | Diag(D.getName().getBeginLoc(), | |||
10410 | diag::err_deduction_guide_no_trailing_return_type); | |||
10411 | break; | |||
10412 | } | |||
10413 | ||||
10414 | // Check that the return type is written as a specialization of | |||
10415 | // the template specified as the deduction-guide's name. | |||
10416 | ParsedType TrailingReturnType = Chunk.Fun.getTrailingReturnType(); | |||
10417 | TypeSourceInfo *TSI = nullptr; | |||
10418 | QualType RetTy = GetTypeFromParser(TrailingReturnType, &TSI); | |||
10419 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 10419, __PRETTY_FUNCTION__)); | |||
10420 | bool AcceptableReturnType = false; | |||
10421 | bool MightInstantiateToSpecialization = false; | |||
10422 | if (auto RetTST = | |||
10423 | TSI->getTypeLoc().getAs<TemplateSpecializationTypeLoc>()) { | |||
10424 | TemplateName SpecifiedName = RetTST.getTypePtr()->getTemplateName(); | |||
10425 | bool TemplateMatches = | |||
10426 | Context.hasSameTemplateName(SpecifiedName, GuidedTemplate); | |||
10427 | if (SpecifiedName.getKind() == TemplateName::Template && TemplateMatches) | |||
10428 | AcceptableReturnType = true; | |||
10429 | else { | |||
10430 | // This could still instantiate to the right type, unless we know it | |||
10431 | // names the wrong class template. | |||
10432 | auto *TD = SpecifiedName.getAsTemplateDecl(); | |||
10433 | MightInstantiateToSpecialization = !(TD && isa<ClassTemplateDecl>(TD) && | |||
10434 | !TemplateMatches); | |||
10435 | } | |||
10436 | } else if (!RetTy.hasQualifiers() && RetTy->isDependentType()) { | |||
10437 | MightInstantiateToSpecialization = true; | |||
10438 | } | |||
10439 | ||||
10440 | if (!AcceptableReturnType) { | |||
10441 | Diag(TSI->getTypeLoc().getBeginLoc(), | |||
10442 | diag::err_deduction_guide_bad_trailing_return_type) | |||
10443 | << GuidedTemplate << TSI->getType() | |||
10444 | << MightInstantiateToSpecialization | |||
10445 | << TSI->getTypeLoc().getSourceRange(); | |||
10446 | } | |||
10447 | ||||
10448 | // Keep going to check that we don't have any inner declarator pieces (we | |||
10449 | // could still have a function returning a pointer to a function). | |||
10450 | FoundFunction = true; | |||
10451 | } | |||
10452 | ||||
10453 | if (D.isFunctionDefinition()) | |||
10454 | Diag(D.getIdentifierLoc(), diag::err_deduction_guide_defines_function); | |||
10455 | } | |||
10456 | ||||
10457 | //===----------------------------------------------------------------------===// | |||
10458 | // Namespace Handling | |||
10459 | //===----------------------------------------------------------------------===// | |||
10460 | ||||
10461 | /// Diagnose a mismatch in 'inline' qualifiers when a namespace is | |||
10462 | /// reopened. | |||
10463 | static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, | |||
10464 | SourceLocation Loc, | |||
10465 | IdentifierInfo *II, bool *IsInline, | |||
10466 | NamespaceDecl *PrevNS) { | |||
10467 | assert(*IsInline != PrevNS->isInline())((*IsInline != PrevNS->isInline()) ? static_cast<void> (0) : __assert_fail ("*IsInline != PrevNS->isInline()", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 10467, __PRETTY_FUNCTION__)); | |||
10468 | ||||
10469 | // HACK: Work around a bug in libstdc++4.6's <atomic>, where | |||
10470 | // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as | |||
10471 | // inline namespaces, with the intention of bringing names into namespace std. | |||
10472 | // | |||
10473 | // We support this just well enough to get that case working; this is not | |||
10474 | // sufficient to support reopening namespaces as inline in general. | |||
10475 | if (*IsInline && II && II->getName().startswith("__atomic") && | |||
10476 | S.getSourceManager().isInSystemHeader(Loc)) { | |||
10477 | // Mark all prior declarations of the namespace as inline. | |||
10478 | for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; | |||
10479 | NS = NS->getPreviousDecl()) | |||
10480 | NS->setInline(*IsInline); | |||
10481 | // Patch up the lookup table for the containing namespace. This isn't really | |||
10482 | // correct, but it's good enough for this particular case. | |||
10483 | for (auto *I : PrevNS->decls()) | |||
10484 | if (auto *ND = dyn_cast<NamedDecl>(I)) | |||
10485 | PrevNS->getParent()->makeDeclVisibleInContext(ND); | |||
10486 | return; | |||
10487 | } | |||
10488 | ||||
10489 | if (PrevNS->isInline()) | |||
10490 | // The user probably just forgot the 'inline', so suggest that it | |||
10491 | // be added back. | |||
10492 | S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) | |||
10493 | << FixItHint::CreateInsertion(KeywordLoc, "inline "); | |||
10494 | else | |||
10495 | S.Diag(Loc, diag::err_inline_namespace_mismatch); | |||
10496 | ||||
10497 | S.Diag(PrevNS->getLocation(), diag::note_previous_definition); | |||
10498 | *IsInline = PrevNS->isInline(); | |||
10499 | } | |||
10500 | ||||
10501 | /// ActOnStartNamespaceDef - This is called at the start of a namespace | |||
10502 | /// definition. | |||
10503 | Decl *Sema::ActOnStartNamespaceDef( | |||
10504 | Scope *NamespcScope, SourceLocation InlineLoc, SourceLocation NamespaceLoc, | |||
10505 | SourceLocation IdentLoc, IdentifierInfo *II, SourceLocation LBrace, | |||
10506 | const ParsedAttributesView &AttrList, UsingDirectiveDecl *&UD) { | |||
10507 | SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; | |||
10508 | // For anonymous namespace, take the location of the left brace. | |||
10509 | SourceLocation Loc = II ? IdentLoc : LBrace; | |||
10510 | bool IsInline = InlineLoc.isValid(); | |||
10511 | bool IsInvalid = false; | |||
10512 | bool IsStd = false; | |||
10513 | bool AddToKnown = false; | |||
10514 | Scope *DeclRegionScope = NamespcScope->getParent(); | |||
10515 | ||||
10516 | NamespaceDecl *PrevNS = nullptr; | |||
10517 | if (II) { | |||
10518 | // C++ [namespace.def]p2: | |||
10519 | // The identifier in an original-namespace-definition shall not | |||
10520 | // have been previously defined in the declarative region in | |||
10521 | // which the original-namespace-definition appears. The | |||
10522 | // identifier in an original-namespace-definition is the name of | |||
10523 | // the namespace. Subsequently in that declarative region, it is | |||
10524 | // treated as an original-namespace-name. | |||
10525 | // | |||
10526 | // Since namespace names are unique in their scope, and we don't | |||
10527 | // look through using directives, just look for any ordinary names | |||
10528 | // as if by qualified name lookup. | |||
10529 | LookupResult R(*this, II, IdentLoc, LookupOrdinaryName, | |||
10530 | ForExternalRedeclaration); | |||
10531 | LookupQualifiedName(R, CurContext->getRedeclContext()); | |||
10532 | NamedDecl *PrevDecl = | |||
10533 | R.isSingleResult() ? R.getRepresentativeDecl() : nullptr; | |||
10534 | PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); | |||
10535 | ||||
10536 | if (PrevNS) { | |||
10537 | // This is an extended namespace definition. | |||
10538 | if (IsInline != PrevNS->isInline()) | |||
10539 | DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, | |||
10540 | &IsInline, PrevNS); | |||
10541 | } else if (PrevDecl) { | |||
10542 | // This is an invalid name redefinition. | |||
10543 | Diag(Loc, diag::err_redefinition_different_kind) | |||
10544 | << II; | |||
10545 | Diag(PrevDecl->getLocation(), diag::note_previous_definition); | |||
10546 | IsInvalid = true; | |||
10547 | // Continue on to push Namespc as current DeclContext and return it. | |||
10548 | } else if (II->isStr("std") && | |||
10549 | CurContext->getRedeclContext()->isTranslationUnit()) { | |||
10550 | // This is the first "real" definition of the namespace "std", so update | |||
10551 | // our cache of the "std" namespace to point at this definition. | |||
10552 | PrevNS = getStdNamespace(); | |||
10553 | IsStd = true; | |||
10554 | AddToKnown = !IsInline; | |||
10555 | } else { | |||
10556 | // We've seen this namespace for the first time. | |||
10557 | AddToKnown = !IsInline; | |||
10558 | } | |||
10559 | } else { | |||
10560 | // Anonymous namespaces. | |||
10561 | ||||
10562 | // Determine whether the parent already has an anonymous namespace. | |||
10563 | DeclContext *Parent = CurContext->getRedeclContext(); | |||
10564 | if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { | |||
10565 | PrevNS = TU->getAnonymousNamespace(); | |||
10566 | } else { | |||
10567 | NamespaceDecl *ND = cast<NamespaceDecl>(Parent); | |||
10568 | PrevNS = ND->getAnonymousNamespace(); | |||
10569 | } | |||
10570 | ||||
10571 | if (PrevNS && IsInline != PrevNS->isInline()) | |||
10572 | DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, | |||
10573 | &IsInline, PrevNS); | |||
10574 | } | |||
10575 | ||||
10576 | NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, | |||
10577 | StartLoc, Loc, II, PrevNS); | |||
10578 | if (IsInvalid) | |||
10579 | Namespc->setInvalidDecl(); | |||
10580 | ||||
10581 | ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); | |||
10582 | AddPragmaAttributes(DeclRegionScope, Namespc); | |||
10583 | ||||
10584 | // FIXME: Should we be merging attributes? | |||
10585 | if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) | |||
10586 | PushNamespaceVisibilityAttr(Attr, Loc); | |||
10587 | ||||
10588 | if (IsStd) | |||
10589 | StdNamespace = Namespc; | |||
10590 | if (AddToKnown) | |||
10591 | KnownNamespaces[Namespc] = false; | |||
10592 | ||||
10593 | if (II) { | |||
10594 | PushOnScopeChains(Namespc, DeclRegionScope); | |||
10595 | } else { | |||
10596 | // Link the anonymous namespace into its parent. | |||
10597 | DeclContext *Parent = CurContext->getRedeclContext(); | |||
10598 | if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { | |||
10599 | TU->setAnonymousNamespace(Namespc); | |||
10600 | } else { | |||
10601 | cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); | |||
10602 | } | |||
10603 | ||||
10604 | CurContext->addDecl(Namespc); | |||
10605 | ||||
10606 | // C++ [namespace.unnamed]p1. An unnamed-namespace-definition | |||
10607 | // behaves as if it were replaced by | |||
10608 | // namespace unique { /* empty body */ } | |||
10609 | // using namespace unique; | |||
10610 | // namespace unique { namespace-body } | |||
10611 | // where all occurrences of 'unique' in a translation unit are | |||
10612 | // replaced by the same identifier and this identifier differs | |||
10613 | // from all other identifiers in the entire program. | |||
10614 | ||||
10615 | // We just create the namespace with an empty name and then add an | |||
10616 | // implicit using declaration, just like the standard suggests. | |||
10617 | // | |||
10618 | // CodeGen enforces the "universally unique" aspect by giving all | |||
10619 | // declarations semantically contained within an anonymous | |||
10620 | // namespace internal linkage. | |||
10621 | ||||
10622 | if (!PrevNS) { | |||
10623 | UD = UsingDirectiveDecl::Create(Context, Parent, | |||
10624 | /* 'using' */ LBrace, | |||
10625 | /* 'namespace' */ SourceLocation(), | |||
10626 | /* qualifier */ NestedNameSpecifierLoc(), | |||
10627 | /* identifier */ SourceLocation(), | |||
10628 | Namespc, | |||
10629 | /* Ancestor */ Parent); | |||
10630 | UD->setImplicit(); | |||
10631 | Parent->addDecl(UD); | |||
10632 | } | |||
10633 | } | |||
10634 | ||||
10635 | ActOnDocumentableDecl(Namespc); | |||
10636 | ||||
10637 | // Although we could have an invalid decl (i.e. the namespace name is a | |||
10638 | // redefinition), push it as current DeclContext and try to continue parsing. | |||
10639 | // FIXME: We should be able to push Namespc here, so that the each DeclContext | |||
10640 | // for the namespace has the declarations that showed up in that particular | |||
10641 | // namespace definition. | |||
10642 | PushDeclContext(NamespcScope, Namespc); | |||
10643 | return Namespc; | |||
10644 | } | |||
10645 | ||||
10646 | /// getNamespaceDecl - Returns the namespace a decl represents. If the decl | |||
10647 | /// is a namespace alias, returns the namespace it points to. | |||
10648 | static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { | |||
10649 | if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) | |||
10650 | return AD->getNamespace(); | |||
10651 | return dyn_cast_or_null<NamespaceDecl>(D); | |||
10652 | } | |||
10653 | ||||
10654 | /// ActOnFinishNamespaceDef - This callback is called after a namespace is | |||
10655 | /// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. | |||
10656 | void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { | |||
10657 | NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); | |||
10658 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 10658, __PRETTY_FUNCTION__)); | |||
10659 | Namespc->setRBraceLoc(RBrace); | |||
10660 | PopDeclContext(); | |||
10661 | if (Namespc->hasAttr<VisibilityAttr>()) | |||
10662 | PopPragmaVisibility(true, RBrace); | |||
10663 | // If this namespace contains an export-declaration, export it now. | |||
10664 | if (DeferredExportedNamespaces.erase(Namespc)) | |||
10665 | Dcl->setModuleOwnershipKind(Decl::ModuleOwnershipKind::VisibleWhenImported); | |||
10666 | } | |||
10667 | ||||
10668 | CXXRecordDecl *Sema::getStdBadAlloc() const { | |||
10669 | return cast_or_null<CXXRecordDecl>( | |||
10670 | StdBadAlloc.get(Context.getExternalSource())); | |||
10671 | } | |||
10672 | ||||
10673 | EnumDecl *Sema::getStdAlignValT() const { | |||
10674 | return cast_or_null<EnumDecl>(StdAlignValT.get(Context.getExternalSource())); | |||
10675 | } | |||
10676 | ||||
10677 | NamespaceDecl *Sema::getStdNamespace() const { | |||
10678 | return cast_or_null<NamespaceDecl>( | |||
10679 | StdNamespace.get(Context.getExternalSource())); | |||
10680 | } | |||
10681 | ||||
10682 | NamespaceDecl *Sema::lookupStdExperimentalNamespace() { | |||
10683 | if (!StdExperimentalNamespaceCache) { | |||
10684 | if (auto Std = getStdNamespace()) { | |||
10685 | LookupResult Result(*this, &PP.getIdentifierTable().get("experimental"), | |||
10686 | SourceLocation(), LookupNamespaceName); | |||
10687 | if (!LookupQualifiedName(Result, Std) || | |||
10688 | !(StdExperimentalNamespaceCache = | |||
10689 | Result.getAsSingle<NamespaceDecl>())) | |||
10690 | Result.suppressDiagnostics(); | |||
10691 | } | |||
10692 | } | |||
10693 | return StdExperimentalNamespaceCache; | |||
10694 | } | |||
10695 | ||||
10696 | namespace { | |||
10697 | ||||
10698 | enum UnsupportedSTLSelect { | |||
10699 | USS_InvalidMember, | |||
10700 | USS_MissingMember, | |||
10701 | USS_NonTrivial, | |||
10702 | USS_Other | |||
10703 | }; | |||
10704 | ||||
10705 | struct InvalidSTLDiagnoser { | |||
10706 | Sema &S; | |||
10707 | SourceLocation Loc; | |||
10708 | QualType TyForDiags; | |||
10709 | ||||
10710 | QualType operator()(UnsupportedSTLSelect Sel = USS_Other, StringRef Name = "", | |||
10711 | const VarDecl *VD = nullptr) { | |||
10712 | { | |||
10713 | auto D = S.Diag(Loc, diag::err_std_compare_type_not_supported) | |||
10714 | << TyForDiags << ((int)Sel); | |||
10715 | if (Sel == USS_InvalidMember || Sel == USS_MissingMember) { | |||
10716 | assert(!Name.empty())((!Name.empty()) ? static_cast<void> (0) : __assert_fail ("!Name.empty()", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 10716, __PRETTY_FUNCTION__)); | |||
10717 | D << Name; | |||
10718 | } | |||
10719 | } | |||
10720 | if (Sel == USS_InvalidMember) { | |||
10721 | S.Diag(VD->getLocation(), diag::note_var_declared_here) | |||
10722 | << VD << VD->getSourceRange(); | |||
10723 | } | |||
10724 | return QualType(); | |||
10725 | } | |||
10726 | }; | |||
10727 | } // namespace | |||
10728 | ||||
10729 | QualType Sema::CheckComparisonCategoryType(ComparisonCategoryType Kind, | |||
10730 | SourceLocation Loc, | |||
10731 | ComparisonCategoryUsage Usage) { | |||
10732 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 10733, __PRETTY_FUNCTION__)) | |||
10733 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 10733, __PRETTY_FUNCTION__)); | |||
10734 | ||||
10735 | // Use an elaborated type for diagnostics which has a name containing the | |||
10736 | // prepended 'std' namespace but not any inline namespace names. | |||
10737 | auto TyForDiags = [&](ComparisonCategoryInfo *Info) { | |||
10738 | auto *NNS = | |||
10739 | NestedNameSpecifier::Create(Context, nullptr, getStdNamespace()); | |||
10740 | return Context.getElaboratedType(ETK_None, NNS, Info->getType()); | |||
10741 | }; | |||
10742 | ||||
10743 | // Check if we've already successfully checked the comparison category type | |||
10744 | // before. If so, skip checking it again. | |||
10745 | ComparisonCategoryInfo *Info = Context.CompCategories.lookupInfo(Kind); | |||
10746 | if (Info && FullyCheckedComparisonCategories[static_cast<unsigned>(Kind)]) { | |||
10747 | // The only thing we need to check is that the type has a reachable | |||
10748 | // definition in the current context. | |||
10749 | if (RequireCompleteType(Loc, TyForDiags(Info), diag::err_incomplete_type)) | |||
10750 | return QualType(); | |||
10751 | ||||
10752 | return Info->getType(); | |||
10753 | } | |||
10754 | ||||
10755 | // If lookup failed | |||
10756 | if (!Info) { | |||
10757 | std::string NameForDiags = "std::"; | |||
10758 | NameForDiags += ComparisonCategories::getCategoryString(Kind); | |||
10759 | Diag(Loc, diag::err_implied_comparison_category_type_not_found) | |||
10760 | << NameForDiags << (int)Usage; | |||
10761 | return QualType(); | |||
10762 | } | |||
10763 | ||||
10764 | assert(Info->Kind == Kind)((Info->Kind == Kind) ? static_cast<void> (0) : __assert_fail ("Info->Kind == Kind", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 10764, __PRETTY_FUNCTION__)); | |||
10765 | assert(Info->Record)((Info->Record) ? static_cast<void> (0) : __assert_fail ("Info->Record", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 10765, __PRETTY_FUNCTION__)); | |||
10766 | ||||
10767 | // Update the Record decl in case we encountered a forward declaration on our | |||
10768 | // first pass. FIXME: This is a bit of a hack. | |||
10769 | if (Info->Record->hasDefinition()) | |||
10770 | Info->Record = Info->Record->getDefinition(); | |||
10771 | ||||
10772 | if (RequireCompleteType(Loc, TyForDiags(Info), diag::err_incomplete_type)) | |||
10773 | return QualType(); | |||
10774 | ||||
10775 | InvalidSTLDiagnoser UnsupportedSTLError{*this, Loc, TyForDiags(Info)}; | |||
10776 | ||||
10777 | if (!Info->Record->isTriviallyCopyable()) | |||
10778 | return UnsupportedSTLError(USS_NonTrivial); | |||
10779 | ||||
10780 | for (const CXXBaseSpecifier &BaseSpec : Info->Record->bases()) { | |||
10781 | CXXRecordDecl *Base = BaseSpec.getType()->getAsCXXRecordDecl(); | |||
10782 | // Tolerate empty base classes. | |||
10783 | if (Base->isEmpty()) | |||
10784 | continue; | |||
10785 | // Reject STL implementations which have at least one non-empty base. | |||
10786 | return UnsupportedSTLError(); | |||
10787 | } | |||
10788 | ||||
10789 | // Check that the STL has implemented the types using a single integer field. | |||
10790 | // This expectation allows better codegen for builtin operators. We require: | |||
10791 | // (1) The class has exactly one field. | |||
10792 | // (2) The field is an integral or enumeration type. | |||
10793 | auto FIt = Info->Record->field_begin(), FEnd = Info->Record->field_end(); | |||
10794 | if (std::distance(FIt, FEnd) != 1 || | |||
10795 | !FIt->getType()->isIntegralOrEnumerationType()) { | |||
10796 | return UnsupportedSTLError(); | |||
10797 | } | |||
10798 | ||||
10799 | // Build each of the require values and store them in Info. | |||
10800 | for (ComparisonCategoryResult CCR : | |||
10801 | ComparisonCategories::getPossibleResultsForType(Kind)) { | |||
10802 | StringRef MemName = ComparisonCategories::getResultString(CCR); | |||
10803 | ComparisonCategoryInfo::ValueInfo *ValInfo = Info->lookupValueInfo(CCR); | |||
10804 | ||||
10805 | if (!ValInfo) | |||
10806 | return UnsupportedSTLError(USS_MissingMember, MemName); | |||
10807 | ||||
10808 | VarDecl *VD = ValInfo->VD; | |||
10809 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 10809, __PRETTY_FUNCTION__)); | |||
10810 | ||||
10811 | // Attempt to diagnose reasons why the STL definition of this type | |||
10812 | // might be foobar, including it failing to be a constant expression. | |||
10813 | // TODO Handle more ways the lookup or result can be invalid. | |||
10814 | if (!VD->isStaticDataMember() || !VD->isConstexpr() || !VD->hasInit() || | |||
10815 | !VD->checkInitIsICE()) | |||
10816 | return UnsupportedSTLError(USS_InvalidMember, MemName, VD); | |||
10817 | ||||
10818 | // Attempt to evaluate the var decl as a constant expression and extract | |||
10819 | // the value of its first field as a ICE. If this fails, the STL | |||
10820 | // implementation is not supported. | |||
10821 | if (!ValInfo->hasValidIntValue()) | |||
10822 | return UnsupportedSTLError(); | |||
10823 | ||||
10824 | MarkVariableReferenced(Loc, VD); | |||
10825 | } | |||
10826 | ||||
10827 | // We've successfully built the required types and expressions. Update | |||
10828 | // the cache and return the newly cached value. | |||
10829 | FullyCheckedComparisonCategories[static_cast<unsigned>(Kind)] = true; | |||
10830 | return Info->getType(); | |||
10831 | } | |||
10832 | ||||
10833 | /// Retrieve the special "std" namespace, which may require us to | |||
10834 | /// implicitly define the namespace. | |||
10835 | NamespaceDecl *Sema::getOrCreateStdNamespace() { | |||
10836 | if (!StdNamespace) { | |||
10837 | // The "std" namespace has not yet been defined, so build one implicitly. | |||
10838 | StdNamespace = NamespaceDecl::Create(Context, | |||
10839 | Context.getTranslationUnitDecl(), | |||
10840 | /*Inline=*/false, | |||
10841 | SourceLocation(), SourceLocation(), | |||
10842 | &PP.getIdentifierTable().get("std"), | |||
10843 | /*PrevDecl=*/nullptr); | |||
10844 | getStdNamespace()->setImplicit(true); | |||
10845 | } | |||
10846 | ||||
10847 | return getStdNamespace(); | |||
10848 | } | |||
10849 | ||||
10850 | bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { | |||
10851 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 10852, __PRETTY_FUNCTION__)) | |||
10852 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 10852, __PRETTY_FUNCTION__)); | |||
10853 | ||||
10854 | // We're looking for implicit instantiations of | |||
10855 | // template <typename E> class std::initializer_list. | |||
10856 | ||||
10857 | if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. | |||
10858 | return false; | |||
10859 | ||||
10860 | ClassTemplateDecl *Template = nullptr; | |||
10861 | const TemplateArgument *Arguments = nullptr; | |||
10862 | ||||
10863 | if (const RecordType *RT = Ty->getAs<RecordType>()) { | |||
10864 | ||||
10865 | ClassTemplateSpecializationDecl *Specialization = | |||
10866 | dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); | |||
10867 | if (!Specialization) | |||
10868 | return false; | |||
10869 | ||||
10870 | Template = Specialization->getSpecializedTemplate(); | |||
10871 | Arguments = Specialization->getTemplateArgs().data(); | |||
10872 | } else if (const TemplateSpecializationType *TST = | |||
10873 | Ty->getAs<TemplateSpecializationType>()) { | |||
10874 | Template = dyn_cast_or_null<ClassTemplateDecl>( | |||
10875 | TST->getTemplateName().getAsTemplateDecl()); | |||
10876 | Arguments = TST->getArgs(); | |||
10877 | } | |||
10878 | if (!Template) | |||
10879 | return false; | |||
10880 | ||||
10881 | if (!StdInitializerList) { | |||
10882 | // Haven't recognized std::initializer_list yet, maybe this is it. | |||
10883 | CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); | |||
10884 | if (TemplateClass->getIdentifier() != | |||
10885 | &PP.getIdentifierTable().get("initializer_list") || | |||
10886 | !getStdNamespace()->InEnclosingNamespaceSetOf( | |||
10887 | TemplateClass->getDeclContext())) | |||
10888 | return false; | |||
10889 | // This is a template called std::initializer_list, but is it the right | |||
10890 | // template? | |||
10891 | TemplateParameterList *Params = Template->getTemplateParameters(); | |||
10892 | if (Params->getMinRequiredArguments() != 1) | |||
10893 | return false; | |||
10894 | if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) | |||
10895 | return false; | |||
10896 | ||||
10897 | // It's the right template. | |||
10898 | StdInitializerList = Template; | |||
10899 | } | |||
10900 | ||||
10901 | if (Template->getCanonicalDecl() != StdInitializerList->getCanonicalDecl()) | |||
10902 | return false; | |||
10903 | ||||
10904 | // This is an instance of std::initializer_list. Find the argument type. | |||
10905 | if (Element) | |||
10906 | *Element = Arguments[0].getAsType(); | |||
10907 | return true; | |||
10908 | } | |||
10909 | ||||
10910 | static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ | |||
10911 | NamespaceDecl *Std = S.getStdNamespace(); | |||
10912 | if (!Std) { | |||
10913 | S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); | |||
10914 | return nullptr; | |||
10915 | } | |||
10916 | ||||
10917 | LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), | |||
10918 | Loc, Sema::LookupOrdinaryName); | |||
10919 | if (!S.LookupQualifiedName(Result, Std)) { | |||
10920 | S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); | |||
10921 | return nullptr; | |||
10922 | } | |||
10923 | ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); | |||
10924 | if (!Template) { | |||
10925 | Result.suppressDiagnostics(); | |||
10926 | // We found something weird. Complain about the first thing we found. | |||
10927 | NamedDecl *Found = *Result.begin(); | |||
10928 | S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); | |||
10929 | return nullptr; | |||
10930 | } | |||
10931 | ||||
10932 | // We found some template called std::initializer_list. Now verify that it's | |||
10933 | // correct. | |||
10934 | TemplateParameterList *Params = Template->getTemplateParameters(); | |||
10935 | if (Params->getMinRequiredArguments() != 1 || | |||
10936 | !isa<TemplateTypeParmDecl>(Params->getParam(0))) { | |||
10937 | S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); | |||
10938 | return nullptr; | |||
10939 | } | |||
10940 | ||||
10941 | return Template; | |||
10942 | } | |||
10943 | ||||
10944 | QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { | |||
10945 | if (!StdInitializerList) { | |||
10946 | StdInitializerList = LookupStdInitializerList(*this, Loc); | |||
10947 | if (!StdInitializerList) | |||
10948 | return QualType(); | |||
10949 | } | |||
10950 | ||||
10951 | TemplateArgumentListInfo Args(Loc, Loc); | |||
10952 | Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), | |||
10953 | Context.getTrivialTypeSourceInfo(Element, | |||
10954 | Loc))); | |||
10955 | return Context.getCanonicalType( | |||
10956 | CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); | |||
10957 | } | |||
10958 | ||||
10959 | bool Sema::isInitListConstructor(const FunctionDecl *Ctor) { | |||
10960 | // C++ [dcl.init.list]p2: | |||
10961 | // A constructor is an initializer-list constructor if its first parameter | |||
10962 | // is of type std::initializer_list<E> or reference to possibly cv-qualified | |||
10963 | // std::initializer_list<E> for some type E, and either there are no other | |||
10964 | // parameters or else all other parameters have default arguments. | |||
10965 | if (Ctor->getNumParams() < 1 || | |||
10966 | (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) | |||
10967 | return false; | |||
10968 | ||||
10969 | QualType ArgType = Ctor->getParamDecl(0)->getType(); | |||
10970 | if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) | |||
10971 | ArgType = RT->getPointeeType().getUnqualifiedType(); | |||
10972 | ||||
10973 | return isStdInitializerList(ArgType, nullptr); | |||
10974 | } | |||
10975 | ||||
10976 | /// Determine whether a using statement is in a context where it will be | |||
10977 | /// apply in all contexts. | |||
10978 | static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { | |||
10979 | switch (CurContext->getDeclKind()) { | |||
10980 | case Decl::TranslationUnit: | |||
10981 | return true; | |||
10982 | case Decl::LinkageSpec: | |||
10983 | return IsUsingDirectiveInToplevelContext(CurContext->getParent()); | |||
10984 | default: | |||
10985 | return false; | |||
10986 | } | |||
10987 | } | |||
10988 | ||||
10989 | namespace { | |||
10990 | ||||
10991 | // Callback to only accept typo corrections that are namespaces. | |||
10992 | class NamespaceValidatorCCC final : public CorrectionCandidateCallback { | |||
10993 | public: | |||
10994 | bool ValidateCandidate(const TypoCorrection &candidate) override { | |||
10995 | if (NamedDecl *ND = candidate.getCorrectionDecl()) | |||
10996 | return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); | |||
10997 | return false; | |||
10998 | } | |||
10999 | ||||
11000 | std::unique_ptr<CorrectionCandidateCallback> clone() override { | |||
11001 | return std::make_unique<NamespaceValidatorCCC>(*this); | |||
11002 | } | |||
11003 | }; | |||
11004 | ||||
11005 | } | |||
11006 | ||||
11007 | static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, | |||
11008 | CXXScopeSpec &SS, | |||
11009 | SourceLocation IdentLoc, | |||
11010 | IdentifierInfo *Ident) { | |||
11011 | R.clear(); | |||
11012 | NamespaceValidatorCCC CCC{}; | |||
11013 | if (TypoCorrection Corrected = | |||
11014 | S.CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), Sc, &SS, CCC, | |||
11015 | Sema::CTK_ErrorRecovery)) { | |||
11016 | if (DeclContext *DC = S.computeDeclContext(SS, false)) { | |||
11017 | std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); | |||
11018 | bool DroppedSpecifier = Corrected.WillReplaceSpecifier() && | |||
11019 | Ident->getName().equals(CorrectedStr); | |||
11020 | S.diagnoseTypo(Corrected, | |||
11021 | S.PDiag(diag::err_using_directive_member_suggest) | |||
11022 | << Ident << DC << DroppedSpecifier << SS.getRange(), | |||
11023 | S.PDiag(diag::note_namespace_defined_here)); | |||
11024 | } else { | |||
11025 | S.diagnoseTypo(Corrected, | |||
11026 | S.PDiag(diag::err_using_directive_suggest) << Ident, | |||
11027 | S.PDiag(diag::note_namespace_defined_here)); | |||
11028 | } | |||
11029 | R.addDecl(Corrected.getFoundDecl()); | |||
11030 | return true; | |||
11031 | } | |||
11032 | return false; | |||
11033 | } | |||
11034 | ||||
11035 | Decl *Sema::ActOnUsingDirective(Scope *S, SourceLocation UsingLoc, | |||
11036 | SourceLocation NamespcLoc, CXXScopeSpec &SS, | |||
11037 | SourceLocation IdentLoc, | |||
11038 | IdentifierInfo *NamespcName, | |||
11039 | const ParsedAttributesView &AttrList) { | |||
11040 | assert(!SS.isInvalid() && "Invalid CXXScopeSpec.")((!SS.isInvalid() && "Invalid CXXScopeSpec.") ? static_cast <void> (0) : __assert_fail ("!SS.isInvalid() && \"Invalid CXXScopeSpec.\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 11040, __PRETTY_FUNCTION__)); | |||
11041 | assert(NamespcName && "Invalid NamespcName.")((NamespcName && "Invalid NamespcName.") ? static_cast <void> (0) : __assert_fail ("NamespcName && \"Invalid NamespcName.\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 11041, __PRETTY_FUNCTION__)); | |||
11042 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 11042, __PRETTY_FUNCTION__)); | |||
11043 | ||||
11044 | // This can only happen along a recovery path. | |||
11045 | while (S->isTemplateParamScope()) | |||
11046 | S = S->getParent(); | |||
11047 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 11047, __PRETTY_FUNCTION__)); | |||
11048 | ||||
11049 | UsingDirectiveDecl *UDir = nullptr; | |||
11050 | NestedNameSpecifier *Qualifier = nullptr; | |||
11051 | if (SS.isSet()) | |||
11052 | Qualifier = SS.getScopeRep(); | |||
11053 | ||||
11054 | // Lookup namespace name. | |||
11055 | LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); | |||
11056 | LookupParsedName(R, S, &SS); | |||
11057 | if (R.isAmbiguous()) | |||
11058 | return nullptr; | |||
11059 | ||||
11060 | if (R.empty()) { | |||
11061 | R.clear(); | |||
11062 | // Allow "using namespace std;" or "using namespace ::std;" even if | |||
11063 | // "std" hasn't been defined yet, for GCC compatibility. | |||
11064 | if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && | |||
11065 | NamespcName->isStr("std")) { | |||
11066 | Diag(IdentLoc, diag::ext_using_undefined_std); | |||
11067 | R.addDecl(getOrCreateStdNamespace()); | |||
11068 | R.resolveKind(); | |||
11069 | } | |||
11070 | // Otherwise, attempt typo correction. | |||
11071 | else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); | |||
11072 | } | |||
11073 | ||||
11074 | if (!R.empty()) { | |||
11075 | NamedDecl *Named = R.getRepresentativeDecl(); | |||
11076 | NamespaceDecl *NS = R.getAsSingle<NamespaceDecl>(); | |||
11077 | assert(NS && "expected namespace decl")((NS && "expected namespace decl") ? static_cast<void > (0) : __assert_fail ("NS && \"expected namespace decl\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 11077, __PRETTY_FUNCTION__)); | |||
11078 | ||||
11079 | // The use of a nested name specifier may trigger deprecation warnings. | |||
11080 | DiagnoseUseOfDecl(Named, IdentLoc); | |||
11081 | ||||
11082 | // C++ [namespace.udir]p1: | |||
11083 | // A using-directive specifies that the names in the nominated | |||
11084 | // namespace can be used in the scope in which the | |||
11085 | // using-directive appears after the using-directive. During | |||
11086 | // unqualified name lookup (3.4.1), the names appear as if they | |||
11087 | // were declared in the nearest enclosing namespace which | |||
11088 | // contains both the using-directive and the nominated | |||
11089 | // namespace. [Note: in this context, "contains" means "contains | |||
11090 | // directly or indirectly". ] | |||
11091 | ||||
11092 | // Find enclosing context containing both using-directive and | |||
11093 | // nominated namespace. | |||
11094 | DeclContext *CommonAncestor = NS; | |||
11095 | while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) | |||
11096 | CommonAncestor = CommonAncestor->getParent(); | |||
11097 | ||||
11098 | UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, | |||
11099 | SS.getWithLocInContext(Context), | |||
11100 | IdentLoc, Named, CommonAncestor); | |||
11101 | ||||
11102 | if (IsUsingDirectiveInToplevelContext(CurContext) && | |||
11103 | !SourceMgr.isInMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { | |||
11104 | Diag(IdentLoc, diag::warn_using_directive_in_header); | |||
11105 | } | |||
11106 | ||||
11107 | PushUsingDirective(S, UDir); | |||
11108 | } else { | |||
11109 | Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); | |||
11110 | } | |||
11111 | ||||
11112 | if (UDir) | |||
11113 | ProcessDeclAttributeList(S, UDir, AttrList); | |||
11114 | ||||
11115 | return UDir; | |||
11116 | } | |||
11117 | ||||
11118 | void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { | |||
11119 | // If the scope has an associated entity and the using directive is at | |||
11120 | // namespace or translation unit scope, add the UsingDirectiveDecl into | |||
11121 | // its lookup structure so qualified name lookup can find it. | |||
11122 | DeclContext *Ctx = S->getEntity(); | |||
11123 | if (Ctx && !Ctx->isFunctionOrMethod()) | |||
11124 | Ctx->addDecl(UDir); | |||
11125 | else | |||
11126 | // Otherwise, it is at block scope. The using-directives will affect lookup | |||
11127 | // only to the end of the scope. | |||
11128 | S->PushUsingDirective(UDir); | |||
11129 | } | |||
11130 | ||||
11131 | Decl *Sema::ActOnUsingDeclaration(Scope *S, AccessSpecifier AS, | |||
11132 | SourceLocation UsingLoc, | |||
11133 | SourceLocation TypenameLoc, CXXScopeSpec &SS, | |||
11134 | UnqualifiedId &Name, | |||
11135 | SourceLocation EllipsisLoc, | |||
11136 | const ParsedAttributesView &AttrList) { | |||
11137 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 11137, __PRETTY_FUNCTION__)); | |||
11138 | ||||
11139 | if (SS.isEmpty()) { | |||
11140 | Diag(Name.getBeginLoc(), diag::err_using_requires_qualname); | |||
11141 | return nullptr; | |||
11142 | } | |||
11143 | ||||
11144 | switch (Name.getKind()) { | |||
11145 | case UnqualifiedIdKind::IK_ImplicitSelfParam: | |||
11146 | case UnqualifiedIdKind::IK_Identifier: | |||
11147 | case UnqualifiedIdKind::IK_OperatorFunctionId: | |||
11148 | case UnqualifiedIdKind::IK_LiteralOperatorId: | |||
11149 | case UnqualifiedIdKind::IK_ConversionFunctionId: | |||
11150 | break; | |||
11151 | ||||
11152 | case UnqualifiedIdKind::IK_ConstructorName: | |||
11153 | case UnqualifiedIdKind::IK_ConstructorTemplateId: | |||
11154 | // C++11 inheriting constructors. | |||
11155 | Diag(Name.getBeginLoc(), | |||
11156 | getLangOpts().CPlusPlus11 | |||
11157 | ? diag::warn_cxx98_compat_using_decl_constructor | |||
11158 | : diag::err_using_decl_constructor) | |||
11159 | << SS.getRange(); | |||
11160 | ||||
11161 | if (getLangOpts().CPlusPlus11) break; | |||
11162 | ||||
11163 | return nullptr; | |||
11164 | ||||
11165 | case UnqualifiedIdKind::IK_DestructorName: | |||
11166 | Diag(Name.getBeginLoc(), diag::err_using_decl_destructor) << SS.getRange(); | |||
11167 | return nullptr; | |||
11168 | ||||
11169 | case UnqualifiedIdKind::IK_TemplateId: | |||
11170 | Diag(Name.getBeginLoc(), diag::err_using_decl_template_id) | |||
11171 | << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); | |||
11172 | return nullptr; | |||
11173 | ||||
11174 | case UnqualifiedIdKind::IK_DeductionGuideName: | |||
11175 | llvm_unreachable("cannot parse qualified deduction guide name")::llvm::llvm_unreachable_internal("cannot parse qualified deduction guide name" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 11175); | |||
11176 | } | |||
11177 | ||||
11178 | DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); | |||
11179 | DeclarationName TargetName = TargetNameInfo.getName(); | |||
11180 | if (!TargetName) | |||
11181 | return nullptr; | |||
11182 | ||||
11183 | // Warn about access declarations. | |||
11184 | if (UsingLoc.isInvalid()) { | |||
11185 | Diag(Name.getBeginLoc(), getLangOpts().CPlusPlus11 | |||
11186 | ? diag::err_access_decl | |||
11187 | : diag::warn_access_decl_deprecated) | |||
11188 | << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); | |||
11189 | } | |||
11190 | ||||
11191 | if (EllipsisLoc.isInvalid()) { | |||
11192 | if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || | |||
11193 | DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) | |||
11194 | return nullptr; | |||
11195 | } else { | |||
11196 | if (!SS.getScopeRep()->containsUnexpandedParameterPack() && | |||
11197 | !TargetNameInfo.containsUnexpandedParameterPack()) { | |||
11198 | Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) | |||
11199 | << SourceRange(SS.getBeginLoc(), TargetNameInfo.getEndLoc()); | |||
11200 | EllipsisLoc = SourceLocation(); | |||
11201 | } | |||
11202 | } | |||
11203 | ||||
11204 | NamedDecl *UD = | |||
11205 | BuildUsingDeclaration(S, AS, UsingLoc, TypenameLoc.isValid(), TypenameLoc, | |||
11206 | SS, TargetNameInfo, EllipsisLoc, AttrList, | |||
11207 | /*IsInstantiation*/false); | |||
11208 | if (UD) | |||
11209 | PushOnScopeChains(UD, S, /*AddToContext*/ false); | |||
11210 | ||||
11211 | return UD; | |||
11212 | } | |||
11213 | ||||
11214 | /// Determine whether a using declaration considers the given | |||
11215 | /// declarations as "equivalent", e.g., if they are redeclarations of | |||
11216 | /// the same entity or are both typedefs of the same type. | |||
11217 | static bool | |||
11218 | IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2) { | |||
11219 | if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) | |||
11220 | return true; | |||
11221 | ||||
11222 | if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) | |||
11223 | if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) | |||
11224 | return Context.hasSameType(TD1->getUnderlyingType(), | |||
11225 | TD2->getUnderlyingType()); | |||
11226 | ||||
11227 | return false; | |||
11228 | } | |||
11229 | ||||
11230 | ||||
11231 | /// Determines whether to create a using shadow decl for a particular | |||
11232 | /// decl, given the set of decls existing prior to this using lookup. | |||
11233 | bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, | |||
11234 | const LookupResult &Previous, | |||
11235 | UsingShadowDecl *&PrevShadow) { | |||
11236 | // Diagnose finding a decl which is not from a base class of the | |||
11237 | // current class. We do this now because there are cases where this | |||
11238 | // function will silently decide not to build a shadow decl, which | |||
11239 | // will pre-empt further diagnostics. | |||
11240 | // | |||
11241 | // We don't need to do this in C++11 because we do the check once on | |||
11242 | // the qualifier. | |||
11243 | // | |||
11244 | // FIXME: diagnose the following if we care enough: | |||
11245 | // struct A { int foo; }; | |||
11246 | // struct B : A { using A::foo; }; | |||
11247 | // template <class T> struct C : A {}; | |||
11248 | // template <class T> struct D : C<T> { using B::foo; } // <--- | |||
11249 | // This is invalid (during instantiation) in C++03 because B::foo | |||
11250 | // resolves to the using decl in B, which is not a base class of D<T>. | |||
11251 | // We can't diagnose it immediately because C<T> is an unknown | |||
11252 | // specialization. The UsingShadowDecl in D<T> then points directly | |||
11253 | // to A::foo, which will look well-formed when we instantiate. | |||
11254 | // The right solution is to not collapse the shadow-decl chain. | |||
11255 | if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) { | |||
11256 | DeclContext *OrigDC = Orig->getDeclContext(); | |||
11257 | ||||
11258 | // Handle enums and anonymous structs. | |||
11259 | if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); | |||
11260 | CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); | |||
11261 | while (OrigRec->isAnonymousStructOrUnion()) | |||
11262 | OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); | |||
11263 | ||||
11264 | if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { | |||
11265 | if (OrigDC == CurContext) { | |||
11266 | Diag(Using->getLocation(), | |||
11267 | diag::err_using_decl_nested_name_specifier_is_current_class) | |||
11268 | << Using->getQualifierLoc().getSourceRange(); | |||
11269 | Diag(Orig->getLocation(), diag::note_using_decl_target); | |||
11270 | Using->setInvalidDecl(); | |||
11271 | return true; | |||
11272 | } | |||
11273 | ||||
11274 | Diag(Using->getQualifierLoc().getBeginLoc(), | |||
11275 | diag::err_using_decl_nested_name_specifier_is_not_base_class) | |||
11276 | << Using->getQualifier() | |||
11277 | << cast<CXXRecordDecl>(CurContext) | |||
11278 | << Using->getQualifierLoc().getSourceRange(); | |||
11279 | Diag(Orig->getLocation(), diag::note_using_decl_target); | |||
11280 | Using->setInvalidDecl(); | |||
11281 | return true; | |||
11282 | } | |||
11283 | } | |||
11284 | ||||
11285 | if (Previous.empty()) return false; | |||
11286 | ||||
11287 | NamedDecl *Target = Orig; | |||
11288 | if (isa<UsingShadowDecl>(Target)) | |||
11289 | Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); | |||
11290 | ||||
11291 | // If the target happens to be one of the previous declarations, we | |||
11292 | // don't have a conflict. | |||
11293 | // | |||
11294 | // FIXME: but we might be increasing its access, in which case we | |||
11295 | // should redeclare it. | |||
11296 | NamedDecl *NonTag = nullptr, *Tag = nullptr; | |||
11297 | bool FoundEquivalentDecl = false; | |||
11298 | for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); | |||
11299 | I != E; ++I) { | |||
11300 | NamedDecl *D = (*I)->getUnderlyingDecl(); | |||
11301 | // We can have UsingDecls in our Previous results because we use the same | |||
11302 | // LookupResult for checking whether the UsingDecl itself is a valid | |||
11303 | // redeclaration. | |||
11304 | if (isa<UsingDecl>(D) || isa<UsingPackDecl>(D)) | |||
11305 | continue; | |||
11306 | ||||
11307 | if (auto *RD = dyn_cast<CXXRecordDecl>(D)) { | |||
11308 | // C++ [class.mem]p19: | |||
11309 | // If T is the name of a class, then [every named member other than | |||
11310 | // a non-static data member] shall have a name different from T | |||
11311 | if (RD->isInjectedClassName() && !isa<FieldDecl>(Target) && | |||
11312 | !isa<IndirectFieldDecl>(Target) && | |||
11313 | !isa<UnresolvedUsingValueDecl>(Target) && | |||
11314 | DiagnoseClassNameShadow( | |||
11315 | CurContext, | |||
11316 | DeclarationNameInfo(Using->getDeclName(), Using->getLocation()))) | |||
11317 | return true; | |||
11318 | } | |||
11319 | ||||
11320 | if (IsEquivalentForUsingDecl(Context, D, Target)) { | |||
11321 | if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(*I)) | |||
11322 | PrevShadow = Shadow; | |||
11323 | FoundEquivalentDecl = true; | |||
11324 | } else if (isEquivalentInternalLinkageDeclaration(D, Target)) { | |||
11325 | // We don't conflict with an existing using shadow decl of an equivalent | |||
11326 | // declaration, but we're not a redeclaration of it. | |||
11327 | FoundEquivalentDecl = true; | |||
11328 | } | |||
11329 | ||||
11330 | if (isVisible(D)) | |||
11331 | (isa<TagDecl>(D) ? Tag : NonTag) = D; | |||
11332 | } | |||
11333 | ||||
11334 | if (FoundEquivalentDecl) | |||
11335 | return false; | |||
11336 | ||||
11337 | if (FunctionDecl *FD = Target->getAsFunction()) { | |||
11338 | NamedDecl *OldDecl = nullptr; | |||
11339 | switch (CheckOverload(nullptr, FD, Previous, OldDecl, | |||
11340 | /*IsForUsingDecl*/ true)) { | |||
11341 | case Ovl_Overload: | |||
11342 | return false; | |||
11343 | ||||
11344 | case Ovl_NonFunction: | |||
11345 | Diag(Using->getLocation(), diag::err_using_decl_conflict); | |||
11346 | break; | |||
11347 | ||||
11348 | // We found a decl with the exact signature. | |||
11349 | case Ovl_Match: | |||
11350 | // If we're in a record, we want to hide the target, so we | |||
11351 | // return true (without a diagnostic) to tell the caller not to | |||
11352 | // build a shadow decl. | |||
11353 | if (CurContext->isRecord()) | |||
11354 | return true; | |||
11355 | ||||
11356 | // If we're not in a record, this is an error. | |||
11357 | Diag(Using->getLocation(), diag::err_using_decl_conflict); | |||
11358 | break; | |||
11359 | } | |||
11360 | ||||
11361 | Diag(Target->getLocation(), diag::note_using_decl_target); | |||
11362 | Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); | |||
11363 | Using->setInvalidDecl(); | |||
11364 | return true; | |||
11365 | } | |||
11366 | ||||
11367 | // Target is not a function. | |||
11368 | ||||
11369 | if (isa<TagDecl>(Target)) { | |||
11370 | // No conflict between a tag and a non-tag. | |||
11371 | if (!Tag) return false; | |||
11372 | ||||
11373 | Diag(Using->getLocation(), diag::err_using_decl_conflict); | |||
11374 | Diag(Target->getLocation(), diag::note_using_decl_target); | |||
11375 | Diag(Tag->getLocation(), diag::note_using_decl_conflict); | |||
11376 | Using->setInvalidDecl(); | |||
11377 | return true; | |||
11378 | } | |||
11379 | ||||
11380 | // No conflict between a tag and a non-tag. | |||
11381 | if (!NonTag) return false; | |||
11382 | ||||
11383 | Diag(Using->getLocation(), diag::err_using_decl_conflict); | |||
11384 | Diag(Target->getLocation(), diag::note_using_decl_target); | |||
11385 | Diag(NonTag->getLocation(), diag::note_using_decl_conflict); | |||
11386 | Using->setInvalidDecl(); | |||
11387 | return true; | |||
11388 | } | |||
11389 | ||||
11390 | /// Determine whether a direct base class is a virtual base class. | |||
11391 | static bool isVirtualDirectBase(CXXRecordDecl *Derived, CXXRecordDecl *Base) { | |||
11392 | if (!Derived->getNumVBases()) | |||
11393 | return false; | |||
11394 | for (auto &B : Derived->bases()) | |||
11395 | if (B.getType()->getAsCXXRecordDecl() == Base) | |||
11396 | return B.isVirtual(); | |||
11397 | llvm_unreachable("not a direct base class")::llvm::llvm_unreachable_internal("not a direct base class", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 11397); | |||
11398 | } | |||
11399 | ||||
11400 | /// Builds a shadow declaration corresponding to a 'using' declaration. | |||
11401 | UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, | |||
11402 | UsingDecl *UD, | |||
11403 | NamedDecl *Orig, | |||
11404 | UsingShadowDecl *PrevDecl) { | |||
11405 | // If we resolved to another shadow declaration, just coalesce them. | |||
11406 | NamedDecl *Target = Orig; | |||
11407 | if (isa<UsingShadowDecl>(Target)) { | |||
11408 | Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); | |||
11409 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 11409, __PRETTY_FUNCTION__)); | |||
11410 | } | |||
11411 | ||||
11412 | NamedDecl *NonTemplateTarget = Target; | |||
11413 | if (auto *TargetTD = dyn_cast<TemplateDecl>(Target)) | |||
11414 | NonTemplateTarget = TargetTD->getTemplatedDecl(); | |||
11415 | ||||
11416 | UsingShadowDecl *Shadow; | |||
11417 | if (NonTemplateTarget && isa<CXXConstructorDecl>(NonTemplateTarget)) { | |||
11418 | bool IsVirtualBase = | |||
11419 | isVirtualDirectBase(cast<CXXRecordDecl>(CurContext), | |||
11420 | UD->getQualifier()->getAsRecordDecl()); | |||
11421 | Shadow = ConstructorUsingShadowDecl::Create( | |||
11422 | Context, CurContext, UD->getLocation(), UD, Orig, IsVirtualBase); | |||
11423 | } else { | |||
11424 | Shadow = UsingShadowDecl::Create(Context, CurContext, UD->getLocation(), UD, | |||
11425 | Target); | |||
11426 | } | |||
11427 | UD->addShadowDecl(Shadow); | |||
11428 | ||||
11429 | Shadow->setAccess(UD->getAccess()); | |||
11430 | if (Orig->isInvalidDecl() || UD->isInvalidDecl()) | |||
11431 | Shadow->setInvalidDecl(); | |||
11432 | ||||
11433 | Shadow->setPreviousDecl(PrevDecl); | |||
11434 | ||||
11435 | if (S) | |||
11436 | PushOnScopeChains(Shadow, S); | |||
11437 | else | |||
11438 | CurContext->addDecl(Shadow); | |||
11439 | ||||
11440 | ||||
11441 | return Shadow; | |||
11442 | } | |||
11443 | ||||
11444 | /// Hides a using shadow declaration. This is required by the current | |||
11445 | /// using-decl implementation when a resolvable using declaration in a | |||
11446 | /// class is followed by a declaration which would hide or override | |||
11447 | /// one or more of the using decl's targets; for example: | |||
11448 | /// | |||
11449 | /// struct Base { void foo(int); }; | |||
11450 | /// struct Derived : Base { | |||
11451 | /// using Base::foo; | |||
11452 | /// void foo(int); | |||
11453 | /// }; | |||
11454 | /// | |||
11455 | /// The governing language is C++03 [namespace.udecl]p12: | |||
11456 | /// | |||
11457 | /// When a using-declaration brings names from a base class into a | |||
11458 | /// derived class scope, member functions in the derived class | |||
11459 | /// override and/or hide member functions with the same name and | |||
11460 | /// parameter types in a base class (rather than conflicting). | |||
11461 | /// | |||
11462 | /// There are two ways to implement this: | |||
11463 | /// (1) optimistically create shadow decls when they're not hidden | |||
11464 | /// by existing declarations, or | |||
11465 | /// (2) don't create any shadow decls (or at least don't make them | |||
11466 | /// visible) until we've fully parsed/instantiated the class. | |||
11467 | /// The problem with (1) is that we might have to retroactively remove | |||
11468 | /// a shadow decl, which requires several O(n) operations because the | |||
11469 | /// decl structures are (very reasonably) not designed for removal. | |||
11470 | /// (2) avoids this but is very fiddly and phase-dependent. | |||
11471 | void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { | |||
11472 | if (Shadow->getDeclName().getNameKind() == | |||
11473 | DeclarationName::CXXConversionFunctionName) | |||
11474 | cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); | |||
11475 | ||||
11476 | // Remove it from the DeclContext... | |||
11477 | Shadow->getDeclContext()->removeDecl(Shadow); | |||
11478 | ||||
11479 | // ...and the scope, if applicable... | |||
11480 | if (S) { | |||
11481 | S->RemoveDecl(Shadow); | |||
11482 | IdResolver.RemoveDecl(Shadow); | |||
11483 | } | |||
11484 | ||||
11485 | // ...and the using decl. | |||
11486 | Shadow->getUsingDecl()->removeShadowDecl(Shadow); | |||
11487 | ||||
11488 | // TODO: complain somehow if Shadow was used. It shouldn't | |||
11489 | // be possible for this to happen, because...? | |||
11490 | } | |||
11491 | ||||
11492 | /// Find the base specifier for a base class with the given type. | |||
11493 | static CXXBaseSpecifier *findDirectBaseWithType(CXXRecordDecl *Derived, | |||
11494 | QualType DesiredBase, | |||
11495 | bool &AnyDependentBases) { | |||
11496 | // Check whether the named type is a direct base class. | |||
11497 | CanQualType CanonicalDesiredBase = DesiredBase->getCanonicalTypeUnqualified() | |||
11498 | .getUnqualifiedType(); | |||
11499 | for (auto &Base : Derived->bases()) { | |||
11500 | CanQualType BaseType = Base.getType()->getCanonicalTypeUnqualified(); | |||
11501 | if (CanonicalDesiredBase == BaseType) | |||
11502 | return &Base; | |||
11503 | if (BaseType->isDependentType()) | |||
11504 | AnyDependentBases = true; | |||
11505 | } | |||
11506 | return nullptr; | |||
11507 | } | |||
11508 | ||||
11509 | namespace { | |||
11510 | class UsingValidatorCCC final : public CorrectionCandidateCallback { | |||
11511 | public: | |||
11512 | UsingValidatorCCC(bool HasTypenameKeyword, bool IsInstantiation, | |||
11513 | NestedNameSpecifier *NNS, CXXRecordDecl *RequireMemberOf) | |||
11514 | : HasTypenameKeyword(HasTypenameKeyword), | |||
11515 | IsInstantiation(IsInstantiation), OldNNS(NNS), | |||
11516 | RequireMemberOf(RequireMemberOf) {} | |||
11517 | ||||
11518 | bool ValidateCandidate(const TypoCorrection &Candidate) override { | |||
11519 | NamedDecl *ND = Candidate.getCorrectionDecl(); | |||
11520 | ||||
11521 | // Keywords are not valid here. | |||
11522 | if (!ND || isa<NamespaceDecl>(ND)) | |||
11523 | return false; | |||
11524 | ||||
11525 | // Completely unqualified names are invalid for a 'using' declaration. | |||
11526 | if (Candidate.WillReplaceSpecifier() && !Candidate.getCorrectionSpecifier()) | |||
11527 | return false; | |||
11528 | ||||
11529 | // FIXME: Don't correct to a name that CheckUsingDeclRedeclaration would | |||
11530 | // reject. | |||
11531 | ||||
11532 | if (RequireMemberOf) { | |||
11533 | auto *FoundRecord = dyn_cast<CXXRecordDecl>(ND); | |||
11534 | if (FoundRecord && FoundRecord->isInjectedClassName()) { | |||
11535 | // No-one ever wants a using-declaration to name an injected-class-name | |||
11536 | // of a base class, unless they're declaring an inheriting constructor. | |||
11537 | ASTContext &Ctx = ND->getASTContext(); | |||
11538 | if (!Ctx.getLangOpts().CPlusPlus11) | |||
11539 | return false; | |||
11540 | QualType FoundType = Ctx.getRecordType(FoundRecord); | |||
11541 | ||||
11542 | // Check that the injected-class-name is named as a member of its own | |||
11543 | // type; we don't want to suggest 'using Derived::Base;', since that | |||
11544 | // means something else. | |||
11545 | NestedNameSpecifier *Specifier = | |||
11546 | Candidate.WillReplaceSpecifier() | |||
11547 | ? Candidate.getCorrectionSpecifier() | |||
11548 | : OldNNS; | |||
11549 | if (!Specifier->getAsType() || | |||
11550 | !Ctx.hasSameType(QualType(Specifier->getAsType(), 0), FoundType)) | |||
11551 | return false; | |||
11552 | ||||
11553 | // Check that this inheriting constructor declaration actually names a | |||
11554 | // direct base class of the current class. | |||
11555 | bool AnyDependentBases = false; | |||
11556 | if (!findDirectBaseWithType(RequireMemberOf, | |||
11557 | Ctx.getRecordType(FoundRecord), | |||
11558 | AnyDependentBases) && | |||
11559 | !AnyDependentBases) | |||
11560 | return false; | |||
11561 | } else { | |||
11562 | auto *RD = dyn_cast<CXXRecordDecl>(ND->getDeclContext()); | |||
11563 | if (!RD || RequireMemberOf->isProvablyNotDerivedFrom(RD)) | |||
11564 | return false; | |||
11565 | ||||
11566 | // FIXME: Check that the base class member is accessible? | |||
11567 | } | |||
11568 | } else { | |||
11569 | auto *FoundRecord = dyn_cast<CXXRecordDecl>(ND); | |||
11570 | if (FoundRecord && FoundRecord->isInjectedClassName()) | |||
11571 | return false; | |||
11572 | } | |||
11573 | ||||
11574 | if (isa<TypeDecl>(ND)) | |||
11575 | return HasTypenameKeyword || !IsInstantiation; | |||
11576 | ||||
11577 | return !HasTypenameKeyword; | |||
11578 | } | |||
11579 | ||||
11580 | std::unique_ptr<CorrectionCandidateCallback> clone() override { | |||
11581 | return std::make_unique<UsingValidatorCCC>(*this); | |||
11582 | } | |||
11583 | ||||
11584 | private: | |||
11585 | bool HasTypenameKeyword; | |||
11586 | bool IsInstantiation; | |||
11587 | NestedNameSpecifier *OldNNS; | |||
11588 | CXXRecordDecl *RequireMemberOf; | |||
11589 | }; | |||
11590 | } // end anonymous namespace | |||
11591 | ||||
11592 | /// Builds a using declaration. | |||
11593 | /// | |||
11594 | /// \param IsInstantiation - Whether this call arises from an | |||
11595 | /// instantiation of an unresolved using declaration. We treat | |||
11596 | /// the lookup differently for these declarations. | |||
11597 | NamedDecl *Sema::BuildUsingDeclaration( | |||
11598 | Scope *S, AccessSpecifier AS, SourceLocation UsingLoc, | |||
11599 | bool HasTypenameKeyword, SourceLocation TypenameLoc, CXXScopeSpec &SS, | |||
11600 | DeclarationNameInfo NameInfo, SourceLocation EllipsisLoc, | |||
11601 | const ParsedAttributesView &AttrList, bool IsInstantiation) { | |||
11602 | assert(!SS.isInvalid() && "Invalid CXXScopeSpec.")((!SS.isInvalid() && "Invalid CXXScopeSpec.") ? static_cast <void> (0) : __assert_fail ("!SS.isInvalid() && \"Invalid CXXScopeSpec.\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 11602, __PRETTY_FUNCTION__)); | |||
11603 | SourceLocation IdentLoc = NameInfo.getLoc(); | |||
11604 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 11604, __PRETTY_FUNCTION__)); | |||
11605 | ||||
11606 | // FIXME: We ignore attributes for now. | |||
11607 | ||||
11608 | // For an inheriting constructor declaration, the name of the using | |||
11609 | // declaration is the name of a constructor in this class, not in the | |||
11610 | // base class. | |||
11611 | DeclarationNameInfo UsingName = NameInfo; | |||
11612 | if (UsingName.getName().getNameKind() == DeclarationName::CXXConstructorName) | |||
11613 | if (auto *RD = dyn_cast<CXXRecordDecl>(CurContext)) | |||
11614 | UsingName.setName(Context.DeclarationNames.getCXXConstructorName( | |||
11615 | Context.getCanonicalType(Context.getRecordType(RD)))); | |||
11616 | ||||
11617 | // Do the redeclaration lookup in the current scope. | |||
11618 | LookupResult Previous(*this, UsingName, LookupUsingDeclName, | |||
11619 | ForVisibleRedeclaration); | |||
11620 | Previous.setHideTags(false); | |||
11621 | if (S) { | |||
11622 | LookupName(Previous, S); | |||
11623 | ||||
11624 | // It is really dumb that we have to do this. | |||
11625 | LookupResult::Filter F = Previous.makeFilter(); | |||
11626 | while (F.hasNext()) { | |||
11627 | NamedDecl *D = F.next(); | |||
11628 | if (!isDeclInScope(D, CurContext, S)) | |||
11629 | F.erase(); | |||
11630 | // If we found a local extern declaration that's not ordinarily visible, | |||
11631 | // and this declaration is being added to a non-block scope, ignore it. | |||
11632 | // We're only checking for scope conflicts here, not also for violations | |||
11633 | // of the linkage rules. | |||
11634 | else if (!CurContext->isFunctionOrMethod() && D->isLocalExternDecl() && | |||
11635 | !(D->getIdentifierNamespace() & Decl::IDNS_Ordinary)) | |||
11636 | F.erase(); | |||
11637 | } | |||
11638 | F.done(); | |||
11639 | } else { | |||
11640 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 11640, __PRETTY_FUNCTION__)); | |||
11641 | if (CurContext->isRecord()) | |||
11642 | LookupQualifiedName(Previous, CurContext); | |||
11643 | else { | |||
11644 | // No redeclaration check is needed here; in non-member contexts we | |||
11645 | // diagnosed all possible conflicts with other using-declarations when | |||
11646 | // building the template: | |||
11647 | // | |||
11648 | // For a dependent non-type using declaration, the only valid case is | |||
11649 | // if we instantiate to a single enumerator. We check for conflicts | |||
11650 | // between shadow declarations we introduce, and we check in the template | |||
11651 | // definition for conflicts between a non-type using declaration and any | |||
11652 | // other declaration, which together covers all cases. | |||
11653 | // | |||
11654 | // A dependent typename using declaration will never successfully | |||
11655 | // instantiate, since it will always name a class member, so we reject | |||
11656 | // that in the template definition. | |||
11657 | } | |||
11658 | } | |||
11659 | ||||
11660 | // Check for invalid redeclarations. | |||
11661 | if (CheckUsingDeclRedeclaration(UsingLoc, HasTypenameKeyword, | |||
11662 | SS, IdentLoc, Previous)) | |||
11663 | return nullptr; | |||
11664 | ||||
11665 | // Check for bad qualifiers. | |||
11666 | if (CheckUsingDeclQualifier(UsingLoc, HasTypenameKeyword, SS, NameInfo, | |||
11667 | IdentLoc)) | |||
11668 | return nullptr; | |||
11669 | ||||
11670 | DeclContext *LookupContext = computeDeclContext(SS); | |||
11671 | NamedDecl *D; | |||
11672 | NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); | |||
11673 | if (!LookupContext || EllipsisLoc.isValid()) { | |||
11674 | if (HasTypenameKeyword) { | |||
11675 | // FIXME: not all declaration name kinds are legal here | |||
11676 | D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, | |||
11677 | UsingLoc, TypenameLoc, | |||
11678 | QualifierLoc, | |||
11679 | IdentLoc, NameInfo.getName(), | |||
11680 | EllipsisLoc); | |||
11681 | } else { | |||
11682 | D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, | |||
11683 | QualifierLoc, NameInfo, EllipsisLoc); | |||
11684 | } | |||
11685 | D->setAccess(AS); | |||
11686 | CurContext->addDecl(D); | |||
11687 | return D; | |||
11688 | } | |||
11689 | ||||
11690 | auto Build = [&](bool Invalid) { | |||
11691 | UsingDecl *UD = | |||
11692 | UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, | |||
11693 | UsingName, HasTypenameKeyword); | |||
11694 | UD->setAccess(AS); | |||
11695 | CurContext->addDecl(UD); | |||
11696 | UD->setInvalidDecl(Invalid); | |||
11697 | return UD; | |||
11698 | }; | |||
11699 | auto BuildInvalid = [&]{ return Build(true); }; | |||
11700 | auto BuildValid = [&]{ return Build(false); }; | |||
11701 | ||||
11702 | if (RequireCompleteDeclContext(SS, LookupContext)) | |||
11703 | return BuildInvalid(); | |||
11704 | ||||
11705 | // Look up the target name. | |||
11706 | LookupResult R(*this, NameInfo, LookupOrdinaryName); | |||
11707 | ||||
11708 | // Unlike most lookups, we don't always want to hide tag | |||
11709 | // declarations: tag names are visible through the using declaration | |||
11710 | // even if hidden by ordinary names, *except* in a dependent context | |||
11711 | // where it's important for the sanity of two-phase lookup. | |||
11712 | if (!IsInstantiation) | |||
11713 | R.setHideTags(false); | |||
11714 | ||||
11715 | // For the purposes of this lookup, we have a base object type | |||
11716 | // equal to that of the current context. | |||
11717 | if (CurContext->isRecord()) { | |||
11718 | R.setBaseObjectType( | |||
11719 | Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); | |||
11720 | } | |||
11721 | ||||
11722 | LookupQualifiedName(R, LookupContext); | |||
11723 | ||||
11724 | // Try to correct typos if possible. If constructor name lookup finds no | |||
11725 | // results, that means the named class has no explicit constructors, and we | |||
11726 | // suppressed declaring implicit ones (probably because it's dependent or | |||
11727 | // invalid). | |||
11728 | if (R.empty() && | |||
11729 | NameInfo.getName().getNameKind() != DeclarationName::CXXConstructorName) { | |||
11730 | // HACK: Work around a bug in libstdc++'s detection of ::gets. Sometimes | |||
11731 | // it will believe that glibc provides a ::gets in cases where it does not, | |||
11732 | // and will try to pull it into namespace std with a using-declaration. | |||
11733 | // Just ignore the using-declaration in that case. | |||
11734 | auto *II = NameInfo.getName().getAsIdentifierInfo(); | |||
11735 | if (getLangOpts().CPlusPlus14 && II && II->isStr("gets") && | |||
11736 | CurContext->isStdNamespace() && | |||
11737 | isa<TranslationUnitDecl>(LookupContext) && | |||
11738 | getSourceManager().isInSystemHeader(UsingLoc)) | |||
11739 | return nullptr; | |||
11740 | UsingValidatorCCC CCC(HasTypenameKeyword, IsInstantiation, SS.getScopeRep(), | |||
11741 | dyn_cast<CXXRecordDecl>(CurContext)); | |||
11742 | if (TypoCorrection Corrected = | |||
11743 | CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, CCC, | |||
11744 | CTK_ErrorRecovery)) { | |||
11745 | // We reject candidates where DroppedSpecifier == true, hence the | |||
11746 | // literal '0' below. | |||
11747 | diagnoseTypo(Corrected, PDiag(diag::err_no_member_suggest) | |||
11748 | << NameInfo.getName() << LookupContext << 0 | |||
11749 | << SS.getRange()); | |||
11750 | ||||
11751 | // If we picked a correction with no attached Decl we can't do anything | |||
11752 | // useful with it, bail out. | |||
11753 | NamedDecl *ND = Corrected.getCorrectionDecl(); | |||
11754 | if (!ND) | |||
11755 | return BuildInvalid(); | |||
11756 | ||||
11757 | // If we corrected to an inheriting constructor, handle it as one. | |||
11758 | auto *RD = dyn_cast<CXXRecordDecl>(ND); | |||
11759 | if (RD && RD->isInjectedClassName()) { | |||
11760 | // The parent of the injected class name is the class itself. | |||
11761 | RD = cast<CXXRecordDecl>(RD->getParent()); | |||
11762 | ||||
11763 | // Fix up the information we'll use to build the using declaration. | |||
11764 | if (Corrected.WillReplaceSpecifier()) { | |||
11765 | NestedNameSpecifierLocBuilder Builder; | |||
11766 | Builder.MakeTrivial(Context, Corrected.getCorrectionSpecifier(), | |||
11767 | QualifierLoc.getSourceRange()); | |||
11768 | QualifierLoc = Builder.getWithLocInContext(Context); | |||
11769 | } | |||
11770 | ||||
11771 | // In this case, the name we introduce is the name of a derived class | |||
11772 | // constructor. | |||
11773 | auto *CurClass = cast<CXXRecordDecl>(CurContext); | |||
11774 | UsingName.setName(Context.DeclarationNames.getCXXConstructorName( | |||
11775 | Context.getCanonicalType(Context.getRecordType(CurClass)))); | |||
11776 | UsingName.setNamedTypeInfo(nullptr); | |||
11777 | for (auto *Ctor : LookupConstructors(RD)) | |||
11778 | R.addDecl(Ctor); | |||
11779 | R.resolveKind(); | |||
11780 | } else { | |||
11781 | // FIXME: Pick up all the declarations if we found an overloaded | |||
11782 | // function. | |||
11783 | UsingName.setName(ND->getDeclName()); | |||
11784 | R.addDecl(ND); | |||
11785 | } | |||
11786 | } else { | |||
11787 | Diag(IdentLoc, diag::err_no_member) | |||
11788 | << NameInfo.getName() << LookupContext << SS.getRange(); | |||
11789 | return BuildInvalid(); | |||
11790 | } | |||
11791 | } | |||
11792 | ||||
11793 | if (R.isAmbiguous()) | |||
11794 | return BuildInvalid(); | |||
11795 | ||||
11796 | if (HasTypenameKeyword) { | |||
11797 | // If we asked for a typename and got a non-type decl, error out. | |||
11798 | if (!R.getAsSingle<TypeDecl>()) { | |||
11799 | Diag(IdentLoc, diag::err_using_typename_non_type); | |||
11800 | for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) | |||
11801 | Diag((*I)->getUnderlyingDecl()->getLocation(), | |||
11802 | diag::note_using_decl_target); | |||
11803 | return BuildInvalid(); | |||
11804 | } | |||
11805 | } else { | |||
11806 | // If we asked for a non-typename and we got a type, error out, | |||
11807 | // but only if this is an instantiation of an unresolved using | |||
11808 | // decl. Otherwise just silently find the type name. | |||
11809 | if (IsInstantiation && R.getAsSingle<TypeDecl>()) { | |||
11810 | Diag(IdentLoc, diag::err_using_dependent_value_is_type); | |||
11811 | Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); | |||
11812 | return BuildInvalid(); | |||
11813 | } | |||
11814 | } | |||
11815 | ||||
11816 | // C++14 [namespace.udecl]p6: | |||
11817 | // A using-declaration shall not name a namespace. | |||
11818 | if (R.getAsSingle<NamespaceDecl>()) { | |||
11819 | Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) | |||
11820 | << SS.getRange(); | |||
11821 | return BuildInvalid(); | |||
11822 | } | |||
11823 | ||||
11824 | // C++14 [namespace.udecl]p7: | |||
11825 | // A using-declaration shall not name a scoped enumerator. | |||
11826 | if (auto *ED = R.getAsSingle<EnumConstantDecl>()) { | |||
11827 | if (cast<EnumDecl>(ED->getDeclContext())->isScoped()) { | |||
11828 | Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_scoped_enum) | |||
11829 | << SS.getRange(); | |||
11830 | return BuildInvalid(); | |||
11831 | } | |||
11832 | } | |||
11833 | ||||
11834 | UsingDecl *UD = BuildValid(); | |||
11835 | ||||
11836 | // Some additional rules apply to inheriting constructors. | |||
11837 | if (UsingName.getName().getNameKind() == | |||
11838 | DeclarationName::CXXConstructorName) { | |||
11839 | // Suppress access diagnostics; the access check is instead performed at the | |||
11840 | // point of use for an inheriting constructor. | |||
11841 | R.suppressDiagnostics(); | |||
11842 | if (CheckInheritingConstructorUsingDecl(UD)) | |||
11843 | return UD; | |||
11844 | } | |||
11845 | ||||
11846 | for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { | |||
11847 | UsingShadowDecl *PrevDecl = nullptr; | |||
11848 | if (!CheckUsingShadowDecl(UD, *I, Previous, PrevDecl)) | |||
11849 | BuildUsingShadowDecl(S, UD, *I, PrevDecl); | |||
11850 | } | |||
11851 | ||||
11852 | return UD; | |||
11853 | } | |||
11854 | ||||
11855 | NamedDecl *Sema::BuildUsingPackDecl(NamedDecl *InstantiatedFrom, | |||
11856 | ArrayRef<NamedDecl *> Expansions) { | |||
11857 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 11859, __PRETTY_FUNCTION__)) | |||
11858 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 11859, __PRETTY_FUNCTION__)) | |||
11859 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 11859, __PRETTY_FUNCTION__)); | |||
11860 | ||||
11861 | auto *UPD = | |||
11862 | UsingPackDecl::Create(Context, CurContext, InstantiatedFrom, Expansions); | |||
11863 | UPD->setAccess(InstantiatedFrom->getAccess()); | |||
11864 | CurContext->addDecl(UPD); | |||
11865 | return UPD; | |||
11866 | } | |||
11867 | ||||
11868 | /// Additional checks for a using declaration referring to a constructor name. | |||
11869 | bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { | |||
11870 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 11870, __PRETTY_FUNCTION__)); | |||
11871 | ||||
11872 | const Type *SourceType = UD->getQualifier()->getAsType(); | |||
11873 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 11874, __PRETTY_FUNCTION__)) | |||
11874 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 11874, __PRETTY_FUNCTION__)); | |||
11875 | CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); | |||
11876 | ||||
11877 | // Check whether the named type is a direct base class. | |||
11878 | bool AnyDependentBases = false; | |||
11879 | auto *Base = findDirectBaseWithType(TargetClass, QualType(SourceType, 0), | |||
11880 | AnyDependentBases); | |||
11881 | if (!Base && !AnyDependentBases) { | |||
11882 | Diag(UD->getUsingLoc(), | |||
11883 | diag::err_using_decl_constructor_not_in_direct_base) | |||
11884 | << UD->getNameInfo().getSourceRange() | |||
11885 | << QualType(SourceType, 0) << TargetClass; | |||
11886 | UD->setInvalidDecl(); | |||
11887 | return true; | |||
11888 | } | |||
11889 | ||||
11890 | if (Base) | |||
11891 | Base->setInheritConstructors(); | |||
11892 | ||||
11893 | return false; | |||
11894 | } | |||
11895 | ||||
11896 | /// Checks that the given using declaration is not an invalid | |||
11897 | /// redeclaration. Note that this is checking only for the using decl | |||
11898 | /// itself, not for any ill-formedness among the UsingShadowDecls. | |||
11899 | bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, | |||
11900 | bool HasTypenameKeyword, | |||
11901 | const CXXScopeSpec &SS, | |||
11902 | SourceLocation NameLoc, | |||
11903 | const LookupResult &Prev) { | |||
11904 | NestedNameSpecifier *Qual = SS.getScopeRep(); | |||
11905 | ||||
11906 | // C++03 [namespace.udecl]p8: | |||
11907 | // C++0x [namespace.udecl]p10: | |||
11908 | // A using-declaration is a declaration and can therefore be used | |||
11909 | // repeatedly where (and only where) multiple declarations are | |||
11910 | // allowed. | |||
11911 | // | |||
11912 | // That's in non-member contexts. | |||
11913 | if (!CurContext->getRedeclContext()->isRecord()) { | |||
11914 | // A dependent qualifier outside a class can only ever resolve to an | |||
11915 | // enumeration type. Therefore it conflicts with any other non-type | |||
11916 | // declaration in the same scope. | |||
11917 | // FIXME: How should we check for dependent type-type conflicts at block | |||
11918 | // scope? | |||
11919 | if (Qual->isDependent() && !HasTypenameKeyword) { | |||
11920 | for (auto *D : Prev) { | |||
11921 | if (!isa<TypeDecl>(D) && !isa<UsingDecl>(D) && !isa<UsingPackDecl>(D)) { | |||
11922 | bool OldCouldBeEnumerator = | |||
11923 | isa<UnresolvedUsingValueDecl>(D) || isa<EnumConstantDecl>(D); | |||
11924 | Diag(NameLoc, | |||
11925 | OldCouldBeEnumerator ? diag::err_redefinition | |||
11926 | : diag::err_redefinition_different_kind) | |||
11927 | << Prev.getLookupName(); | |||
11928 | Diag(D->getLocation(), diag::note_previous_definition); | |||
11929 | return true; | |||
11930 | } | |||
11931 | } | |||
11932 | } | |||
11933 | return false; | |||
11934 | } | |||
11935 | ||||
11936 | for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { | |||
11937 | NamedDecl *D = *I; | |||
11938 | ||||
11939 | bool DTypename; | |||
11940 | NestedNameSpecifier *DQual; | |||
11941 | if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { | |||
11942 | DTypename = UD->hasTypename(); | |||
11943 | DQual = UD->getQualifier(); | |||
11944 | } else if (UnresolvedUsingValueDecl *UD | |||
11945 | = dyn_cast<UnresolvedUsingValueDecl>(D)) { | |||
11946 | DTypename = false; | |||
11947 | DQual = UD->getQualifier(); | |||
11948 | } else if (UnresolvedUsingTypenameDecl *UD | |||
11949 | = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { | |||
11950 | DTypename = true; | |||
11951 | DQual = UD->getQualifier(); | |||
11952 | } else continue; | |||
11953 | ||||
11954 | // using decls differ if one says 'typename' and the other doesn't. | |||
11955 | // FIXME: non-dependent using decls? | |||
11956 | if (HasTypenameKeyword != DTypename) continue; | |||
11957 | ||||
11958 | // using decls differ if they name different scopes (but note that | |||
11959 | // template instantiation can cause this check to trigger when it | |||
11960 | // didn't before instantiation). | |||
11961 | if (Context.getCanonicalNestedNameSpecifier(Qual) != | |||
11962 | Context.getCanonicalNestedNameSpecifier(DQual)) | |||
11963 | continue; | |||
11964 | ||||
11965 | Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); | |||
11966 | Diag(D->getLocation(), diag::note_using_decl) << 1; | |||
11967 | return true; | |||
11968 | } | |||
11969 | ||||
11970 | return false; | |||
11971 | } | |||
11972 | ||||
11973 | ||||
11974 | /// Checks that the given nested-name qualifier used in a using decl | |||
11975 | /// in the current context is appropriately related to the current | |||
11976 | /// scope. If an error is found, diagnoses it and returns true. | |||
11977 | bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, | |||
11978 | bool HasTypename, | |||
11979 | const CXXScopeSpec &SS, | |||
11980 | const DeclarationNameInfo &NameInfo, | |||
11981 | SourceLocation NameLoc) { | |||
11982 | DeclContext *NamedContext = computeDeclContext(SS); | |||
11983 | ||||
11984 | if (!CurContext->isRecord()) { | |||
11985 | // C++03 [namespace.udecl]p3: | |||
11986 | // C++0x [namespace.udecl]p8: | |||
11987 | // A using-declaration for a class member shall be a member-declaration. | |||
11988 | ||||
11989 | // If we weren't able to compute a valid scope, it might validly be a | |||
11990 | // dependent class scope or a dependent enumeration unscoped scope. If | |||
11991 | // we have a 'typename' keyword, the scope must resolve to a class type. | |||
11992 | if ((HasTypename && !NamedContext) || | |||
11993 | (NamedContext && NamedContext->getRedeclContext()->isRecord())) { | |||
11994 | auto *RD = NamedContext | |||
11995 | ? cast<CXXRecordDecl>(NamedContext->getRedeclContext()) | |||
11996 | : nullptr; | |||
11997 | if (RD && RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), RD)) | |||
11998 | RD = nullptr; | |||
11999 | ||||
12000 | Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) | |||
12001 | << SS.getRange(); | |||
12002 | ||||
12003 | // If we have a complete, non-dependent source type, try to suggest a | |||
12004 | // way to get the same effect. | |||
12005 | if (!RD) | |||
12006 | return true; | |||
12007 | ||||
12008 | // Find what this using-declaration was referring to. | |||
12009 | LookupResult R(*this, NameInfo, LookupOrdinaryName); | |||
12010 | R.setHideTags(false); | |||
12011 | R.suppressDiagnostics(); | |||
12012 | LookupQualifiedName(R, RD); | |||
12013 | ||||
12014 | if (R.getAsSingle<TypeDecl>()) { | |||
12015 | if (getLangOpts().CPlusPlus11) { | |||
12016 | // Convert 'using X::Y;' to 'using Y = X::Y;'. | |||
12017 | Diag(SS.getBeginLoc(), diag::note_using_decl_class_member_workaround) | |||
12018 | << 0 // alias declaration | |||
12019 | << FixItHint::CreateInsertion(SS.getBeginLoc(), | |||
12020 | NameInfo.getName().getAsString() + | |||
12021 | " = "); | |||
12022 | } else { | |||
12023 | // Convert 'using X::Y;' to 'typedef X::Y Y;'. | |||
12024 | SourceLocation InsertLoc = getLocForEndOfToken(NameInfo.getEndLoc()); | |||
12025 | Diag(InsertLoc, diag::note_using_decl_class_member_workaround) | |||
12026 | << 1 // typedef declaration | |||
12027 | << FixItHint::CreateReplacement(UsingLoc, "typedef") | |||
12028 | << FixItHint::CreateInsertion( | |||
12029 | InsertLoc, " " + NameInfo.getName().getAsString()); | |||
12030 | } | |||
12031 | } else if (R.getAsSingle<VarDecl>()) { | |||
12032 | // Don't provide a fixit outside C++11 mode; we don't want to suggest | |||
12033 | // repeating the type of the static data member here. | |||
12034 | FixItHint FixIt; | |||
12035 | if (getLangOpts().CPlusPlus11) { | |||
12036 | // Convert 'using X::Y;' to 'auto &Y = X::Y;'. | |||
12037 | FixIt = FixItHint::CreateReplacement( | |||
12038 | UsingLoc, "auto &" + NameInfo.getName().getAsString() + " = "); | |||
12039 | } | |||
12040 | ||||
12041 | Diag(UsingLoc, diag::note_using_decl_class_member_workaround) | |||
12042 | << 2 // reference declaration | |||
12043 | << FixIt; | |||
12044 | } else if (R.getAsSingle<EnumConstantDecl>()) { | |||
12045 | // Don't provide a fixit outside C++11 mode; we don't want to suggest | |||
12046 | // repeating the type of the enumeration here, and we can't do so if | |||
12047 | // the type is anonymous. | |||
12048 | FixItHint FixIt; | |||
12049 | if (getLangOpts().CPlusPlus11) { | |||
12050 | // Convert 'using X::Y;' to 'auto &Y = X::Y;'. | |||
12051 | FixIt = FixItHint::CreateReplacement( | |||
12052 | UsingLoc, | |||
12053 | "constexpr auto " + NameInfo.getName().getAsString() + " = "); | |||
12054 | } | |||
12055 | ||||
12056 | Diag(UsingLoc, diag::note_using_decl_class_member_workaround) | |||
12057 | << (getLangOpts().CPlusPlus11 ? 4 : 3) // const[expr] variable | |||
12058 | << FixIt; | |||
12059 | } | |||
12060 | return true; | |||
12061 | } | |||
12062 | ||||
12063 | // Otherwise, this might be valid. | |||
12064 | return false; | |||
12065 | } | |||
12066 | ||||
12067 | // The current scope is a record. | |||
12068 | ||||
12069 | // If the named context is dependent, we can't decide much. | |||
12070 | if (!NamedContext) { | |||
12071 | // FIXME: in C++0x, we can diagnose if we can prove that the | |||
12072 | // nested-name-specifier does not refer to a base class, which is | |||
12073 | // still possible in some cases. | |||
12074 | ||||
12075 | // Otherwise we have to conservatively report that things might be | |||
12076 | // okay. | |||
12077 | return false; | |||
12078 | } | |||
12079 | ||||
12080 | if (!NamedContext->isRecord()) { | |||
12081 | // Ideally this would point at the last name in the specifier, | |||
12082 | // but we don't have that level of source info. | |||
12083 | Diag(SS.getRange().getBegin(), | |||
12084 | diag::err_using_decl_nested_name_specifier_is_not_class) | |||
12085 | << SS.getScopeRep() << SS.getRange(); | |||
12086 | return true; | |||
12087 | } | |||
12088 | ||||
12089 | if (!NamedContext->isDependentContext() && | |||
12090 | RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) | |||
12091 | return true; | |||
12092 | ||||
12093 | if (getLangOpts().CPlusPlus11) { | |||
12094 | // C++11 [namespace.udecl]p3: | |||
12095 | // In a using-declaration used as a member-declaration, the | |||
12096 | // nested-name-specifier shall name a base class of the class | |||
12097 | // being defined. | |||
12098 | ||||
12099 | if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( | |||
12100 | cast<CXXRecordDecl>(NamedContext))) { | |||
12101 | if (CurContext == NamedContext) { | |||
12102 | Diag(NameLoc, | |||
12103 | diag::err_using_decl_nested_name_specifier_is_current_class) | |||
12104 | << SS.getRange(); | |||
12105 | return true; | |||
12106 | } | |||
12107 | ||||
12108 | if (!cast<CXXRecordDecl>(NamedContext)->isInvalidDecl()) { | |||
12109 | Diag(SS.getRange().getBegin(), | |||
12110 | diag::err_using_decl_nested_name_specifier_is_not_base_class) | |||
12111 | << SS.getScopeRep() | |||
12112 | << cast<CXXRecordDecl>(CurContext) | |||
12113 | << SS.getRange(); | |||
12114 | } | |||
12115 | return true; | |||
12116 | } | |||
12117 | ||||
12118 | return false; | |||
12119 | } | |||
12120 | ||||
12121 | // C++03 [namespace.udecl]p4: | |||
12122 | // A using-declaration used as a member-declaration shall refer | |||
12123 | // to a member of a base class of the class being defined [etc.]. | |||
12124 | ||||
12125 | // Salient point: SS doesn't have to name a base class as long as | |||
12126 | // lookup only finds members from base classes. Therefore we can | |||
12127 | // diagnose here only if we can prove that that can't happen, | |||
12128 | // i.e. if the class hierarchies provably don't intersect. | |||
12129 | ||||
12130 | // TODO: it would be nice if "definitely valid" results were cached | |||
12131 | // in the UsingDecl and UsingShadowDecl so that these checks didn't | |||
12132 | // need to be repeated. | |||
12133 | ||||
12134 | llvm::SmallPtrSet<const CXXRecordDecl *, 4> Bases; | |||
12135 | auto Collect = [&Bases](const CXXRecordDecl *Base) { | |||
12136 | Bases.insert(Base); | |||
12137 | return true; | |||
12138 | }; | |||
12139 | ||||
12140 | // Collect all bases. Return false if we find a dependent base. | |||
12141 | if (!cast<CXXRecordDecl>(CurContext)->forallBases(Collect)) | |||
12142 | return false; | |||
12143 | ||||
12144 | // Returns true if the base is dependent or is one of the accumulated base | |||
12145 | // classes. | |||
12146 | auto IsNotBase = [&Bases](const CXXRecordDecl *Base) { | |||
12147 | return !Bases.count(Base); | |||
12148 | }; | |||
12149 | ||||
12150 | // Return false if the class has a dependent base or if it or one | |||
12151 | // of its bases is present in the base set of the current context. | |||
12152 | if (Bases.count(cast<CXXRecordDecl>(NamedContext)) || | |||
12153 | !cast<CXXRecordDecl>(NamedContext)->forallBases(IsNotBase)) | |||
12154 | return false; | |||
12155 | ||||
12156 | Diag(SS.getRange().getBegin(), | |||
12157 | diag::err_using_decl_nested_name_specifier_is_not_base_class) | |||
12158 | << SS.getScopeRep() | |||
12159 | << cast<CXXRecordDecl>(CurContext) | |||
12160 | << SS.getRange(); | |||
12161 | ||||
12162 | return true; | |||
12163 | } | |||
12164 | ||||
12165 | Decl *Sema::ActOnAliasDeclaration(Scope *S, AccessSpecifier AS, | |||
12166 | MultiTemplateParamsArg TemplateParamLists, | |||
12167 | SourceLocation UsingLoc, UnqualifiedId &Name, | |||
12168 | const ParsedAttributesView &AttrList, | |||
12169 | TypeResult Type, Decl *DeclFromDeclSpec) { | |||
12170 | // Skip up to the relevant declaration scope. | |||
12171 | while (S->isTemplateParamScope()) | |||
12172 | S = S->getParent(); | |||
12173 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12174, __PRETTY_FUNCTION__)) | |||
12174 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12174, __PRETTY_FUNCTION__)); | |||
12175 | ||||
12176 | if (Type.isInvalid()) | |||
12177 | return nullptr; | |||
12178 | ||||
12179 | bool Invalid = false; | |||
12180 | DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); | |||
12181 | TypeSourceInfo *TInfo = nullptr; | |||
12182 | GetTypeFromParser(Type.get(), &TInfo); | |||
12183 | ||||
12184 | if (DiagnoseClassNameShadow(CurContext, NameInfo)) | |||
12185 | return nullptr; | |||
12186 | ||||
12187 | if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, | |||
12188 | UPPC_DeclarationType)) { | |||
12189 | Invalid = true; | |||
12190 | TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, | |||
12191 | TInfo->getTypeLoc().getBeginLoc()); | |||
12192 | } | |||
12193 | ||||
12194 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, | |||
12195 | TemplateParamLists.size() | |||
12196 | ? forRedeclarationInCurContext() | |||
12197 | : ForVisibleRedeclaration); | |||
12198 | LookupName(Previous, S); | |||
12199 | ||||
12200 | // Warn about shadowing the name of a template parameter. | |||
12201 | if (Previous.isSingleResult() && | |||
12202 | Previous.getFoundDecl()->isTemplateParameter()) { | |||
12203 | DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); | |||
12204 | Previous.clear(); | |||
12205 | } | |||
12206 | ||||
12207 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12208, __PRETTY_FUNCTION__)) | |||
12208 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12208, __PRETTY_FUNCTION__)); | |||
12209 | TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, | |||
12210 | Name.StartLocation, | |||
12211 | Name.Identifier, TInfo); | |||
12212 | ||||
12213 | NewTD->setAccess(AS); | |||
12214 | ||||
12215 | if (Invalid) | |||
12216 | NewTD->setInvalidDecl(); | |||
12217 | ||||
12218 | ProcessDeclAttributeList(S, NewTD, AttrList); | |||
12219 | AddPragmaAttributes(S, NewTD); | |||
12220 | ||||
12221 | CheckTypedefForVariablyModifiedType(S, NewTD); | |||
12222 | Invalid |= NewTD->isInvalidDecl(); | |||
12223 | ||||
12224 | bool Redeclaration = false; | |||
12225 | ||||
12226 | NamedDecl *NewND; | |||
12227 | if (TemplateParamLists.size()) { | |||
12228 | TypeAliasTemplateDecl *OldDecl = nullptr; | |||
12229 | TemplateParameterList *OldTemplateParams = nullptr; | |||
12230 | ||||
12231 | if (TemplateParamLists.size() != 1) { | |||
12232 | Diag(UsingLoc, diag::err_alias_template_extra_headers) | |||
12233 | << SourceRange(TemplateParamLists[1]->getTemplateLoc(), | |||
12234 | TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); | |||
12235 | } | |||
12236 | TemplateParameterList *TemplateParams = TemplateParamLists[0]; | |||
12237 | ||||
12238 | // Check that we can declare a template here. | |||
12239 | if (CheckTemplateDeclScope(S, TemplateParams)) | |||
12240 | return nullptr; | |||
12241 | ||||
12242 | // Only consider previous declarations in the same scope. | |||
12243 | FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, | |||
12244 | /*ExplicitInstantiationOrSpecialization*/false); | |||
12245 | if (!Previous.empty()) { | |||
12246 | Redeclaration = true; | |||
12247 | ||||
12248 | OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); | |||
12249 | if (!OldDecl && !Invalid) { | |||
12250 | Diag(UsingLoc, diag::err_redefinition_different_kind) | |||
12251 | << Name.Identifier; | |||
12252 | ||||
12253 | NamedDecl *OldD = Previous.getRepresentativeDecl(); | |||
12254 | if (OldD->getLocation().isValid()) | |||
12255 | Diag(OldD->getLocation(), diag::note_previous_definition); | |||
12256 | ||||
12257 | Invalid = true; | |||
12258 | } | |||
12259 | ||||
12260 | if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { | |||
12261 | if (TemplateParameterListsAreEqual(TemplateParams, | |||
12262 | OldDecl->getTemplateParameters(), | |||
12263 | /*Complain=*/true, | |||
12264 | TPL_TemplateMatch)) | |||
12265 | OldTemplateParams = | |||
12266 | OldDecl->getMostRecentDecl()->getTemplateParameters(); | |||
12267 | else | |||
12268 | Invalid = true; | |||
12269 | ||||
12270 | TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); | |||
12271 | if (!Invalid && | |||
12272 | !Context.hasSameType(OldTD->getUnderlyingType(), | |||
12273 | NewTD->getUnderlyingType())) { | |||
12274 | // FIXME: The C++0x standard does not clearly say this is ill-formed, | |||
12275 | // but we can't reasonably accept it. | |||
12276 | Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) | |||
12277 | << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); | |||
12278 | if (OldTD->getLocation().isValid()) | |||
12279 | Diag(OldTD->getLocation(), diag::note_previous_definition); | |||
12280 | Invalid = true; | |||
12281 | } | |||
12282 | } | |||
12283 | } | |||
12284 | ||||
12285 | // Merge any previous default template arguments into our parameters, | |||
12286 | // and check the parameter list. | |||
12287 | if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, | |||
12288 | TPC_TypeAliasTemplate)) | |||
12289 | return nullptr; | |||
12290 | ||||
12291 | TypeAliasTemplateDecl *NewDecl = | |||
12292 | TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, | |||
12293 | Name.Identifier, TemplateParams, | |||
12294 | NewTD); | |||
12295 | NewTD->setDescribedAliasTemplate(NewDecl); | |||
12296 | ||||
12297 | NewDecl->setAccess(AS); | |||
12298 | ||||
12299 | if (Invalid) | |||
12300 | NewDecl->setInvalidDecl(); | |||
12301 | else if (OldDecl) { | |||
12302 | NewDecl->setPreviousDecl(OldDecl); | |||
12303 | CheckRedeclarationModuleOwnership(NewDecl, OldDecl); | |||
12304 | } | |||
12305 | ||||
12306 | NewND = NewDecl; | |||
12307 | } else { | |||
12308 | if (auto *TD = dyn_cast_or_null<TagDecl>(DeclFromDeclSpec)) { | |||
12309 | setTagNameForLinkagePurposes(TD, NewTD); | |||
12310 | handleTagNumbering(TD, S); | |||
12311 | } | |||
12312 | ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); | |||
12313 | NewND = NewTD; | |||
12314 | } | |||
12315 | ||||
12316 | PushOnScopeChains(NewND, S); | |||
12317 | ActOnDocumentableDecl(NewND); | |||
12318 | return NewND; | |||
12319 | } | |||
12320 | ||||
12321 | Decl *Sema::ActOnNamespaceAliasDef(Scope *S, SourceLocation NamespaceLoc, | |||
12322 | SourceLocation AliasLoc, | |||
12323 | IdentifierInfo *Alias, CXXScopeSpec &SS, | |||
12324 | SourceLocation IdentLoc, | |||
12325 | IdentifierInfo *Ident) { | |||
12326 | ||||
12327 | // Lookup the namespace name. | |||
12328 | LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); | |||
12329 | LookupParsedName(R, S, &SS); | |||
12330 | ||||
12331 | if (R.isAmbiguous()) | |||
12332 | return nullptr; | |||
12333 | ||||
12334 | if (R.empty()) { | |||
12335 | if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { | |||
12336 | Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); | |||
12337 | return nullptr; | |||
12338 | } | |||
12339 | } | |||
12340 | assert(!R.isAmbiguous() && !R.empty())((!R.isAmbiguous() && !R.empty()) ? static_cast<void > (0) : __assert_fail ("!R.isAmbiguous() && !R.empty()" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12340, __PRETTY_FUNCTION__)); | |||
12341 | NamedDecl *ND = R.getRepresentativeDecl(); | |||
12342 | ||||
12343 | // Check if we have a previous declaration with the same name. | |||
12344 | LookupResult PrevR(*this, Alias, AliasLoc, LookupOrdinaryName, | |||
12345 | ForVisibleRedeclaration); | |||
12346 | LookupName(PrevR, S); | |||
12347 | ||||
12348 | // Check we're not shadowing a template parameter. | |||
12349 | if (PrevR.isSingleResult() && PrevR.getFoundDecl()->isTemplateParameter()) { | |||
12350 | DiagnoseTemplateParameterShadow(AliasLoc, PrevR.getFoundDecl()); | |||
12351 | PrevR.clear(); | |||
12352 | } | |||
12353 | ||||
12354 | // Filter out any other lookup result from an enclosing scope. | |||
12355 | FilterLookupForScope(PrevR, CurContext, S, /*ConsiderLinkage*/false, | |||
12356 | /*AllowInlineNamespace*/false); | |||
12357 | ||||
12358 | // Find the previous declaration and check that we can redeclare it. | |||
12359 | NamespaceAliasDecl *Prev = nullptr; | |||
12360 | if (PrevR.isSingleResult()) { | |||
12361 | NamedDecl *PrevDecl = PrevR.getRepresentativeDecl(); | |||
12362 | if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { | |||
12363 | // We already have an alias with the same name that points to the same | |||
12364 | // namespace; check that it matches. | |||
12365 | if (AD->getNamespace()->Equals(getNamespaceDecl(ND))) { | |||
12366 | Prev = AD; | |||
12367 | } else if (isVisible(PrevDecl)) { | |||
12368 | Diag(AliasLoc, diag::err_redefinition_different_namespace_alias) | |||
12369 | << Alias; | |||
12370 | Diag(AD->getLocation(), diag::note_previous_namespace_alias) | |||
12371 | << AD->getNamespace(); | |||
12372 | return nullptr; | |||
12373 | } | |||
12374 | } else if (isVisible(PrevDecl)) { | |||
12375 | unsigned DiagID = isa<NamespaceDecl>(PrevDecl->getUnderlyingDecl()) | |||
12376 | ? diag::err_redefinition | |||
12377 | : diag::err_redefinition_different_kind; | |||
12378 | Diag(AliasLoc, DiagID) << Alias; | |||
12379 | Diag(PrevDecl->getLocation(), diag::note_previous_definition); | |||
12380 | return nullptr; | |||
12381 | } | |||
12382 | } | |||
12383 | ||||
12384 | // The use of a nested name specifier may trigger deprecation warnings. | |||
12385 | DiagnoseUseOfDecl(ND, IdentLoc); | |||
12386 | ||||
12387 | NamespaceAliasDecl *AliasDecl = | |||
12388 | NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, | |||
12389 | Alias, SS.getWithLocInContext(Context), | |||
12390 | IdentLoc, ND); | |||
12391 | if (Prev) | |||
12392 | AliasDecl->setPreviousDecl(Prev); | |||
12393 | ||||
12394 | PushOnScopeChains(AliasDecl, S); | |||
12395 | return AliasDecl; | |||
12396 | } | |||
12397 | ||||
12398 | namespace { | |||
12399 | struct SpecialMemberExceptionSpecInfo | |||
12400 | : SpecialMemberVisitor<SpecialMemberExceptionSpecInfo> { | |||
12401 | SourceLocation Loc; | |||
12402 | Sema::ImplicitExceptionSpecification ExceptSpec; | |||
12403 | ||||
12404 | SpecialMemberExceptionSpecInfo(Sema &S, CXXMethodDecl *MD, | |||
12405 | Sema::CXXSpecialMember CSM, | |||
12406 | Sema::InheritedConstructorInfo *ICI, | |||
12407 | SourceLocation Loc) | |||
12408 | : SpecialMemberVisitor(S, MD, CSM, ICI), Loc(Loc), ExceptSpec(S) {} | |||
12409 | ||||
12410 | bool visitBase(CXXBaseSpecifier *Base); | |||
12411 | bool visitField(FieldDecl *FD); | |||
12412 | ||||
12413 | void visitClassSubobject(CXXRecordDecl *Class, Subobject Subobj, | |||
12414 | unsigned Quals); | |||
12415 | ||||
12416 | void visitSubobjectCall(Subobject Subobj, | |||
12417 | Sema::SpecialMemberOverloadResult SMOR); | |||
12418 | }; | |||
12419 | } | |||
12420 | ||||
12421 | bool SpecialMemberExceptionSpecInfo::visitBase(CXXBaseSpecifier *Base) { | |||
12422 | auto *RT = Base->getType()->getAs<RecordType>(); | |||
12423 | if (!RT) | |||
12424 | return false; | |||
12425 | ||||
12426 | auto *BaseClass = cast<CXXRecordDecl>(RT->getDecl()); | |||
12427 | Sema::SpecialMemberOverloadResult SMOR = lookupInheritedCtor(BaseClass); | |||
12428 | if (auto *BaseCtor = SMOR.getMethod()) { | |||
12429 | visitSubobjectCall(Base, BaseCtor); | |||
12430 | return false; | |||
12431 | } | |||
12432 | ||||
12433 | visitClassSubobject(BaseClass, Base, 0); | |||
12434 | return false; | |||
12435 | } | |||
12436 | ||||
12437 | bool SpecialMemberExceptionSpecInfo::visitField(FieldDecl *FD) { | |||
12438 | if (CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer()) { | |||
12439 | Expr *E = FD->getInClassInitializer(); | |||
12440 | if (!E) | |||
12441 | // FIXME: It's a little wasteful to build and throw away a | |||
12442 | // CXXDefaultInitExpr here. | |||
12443 | // FIXME: We should have a single context note pointing at Loc, and | |||
12444 | // this location should be MD->getLocation() instead, since that's | |||
12445 | // the location where we actually use the default init expression. | |||
12446 | E = S.BuildCXXDefaultInitExpr(Loc, FD).get(); | |||
12447 | if (E) | |||
12448 | ExceptSpec.CalledExpr(E); | |||
12449 | } else if (auto *RT = S.Context.getBaseElementType(FD->getType()) | |||
12450 | ->getAs<RecordType>()) { | |||
12451 | visitClassSubobject(cast<CXXRecordDecl>(RT->getDecl()), FD, | |||
12452 | FD->getType().getCVRQualifiers()); | |||
12453 | } | |||
12454 | return false; | |||
12455 | } | |||
12456 | ||||
12457 | void SpecialMemberExceptionSpecInfo::visitClassSubobject(CXXRecordDecl *Class, | |||
12458 | Subobject Subobj, | |||
12459 | unsigned Quals) { | |||
12460 | FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); | |||
12461 | bool IsMutable = Field && Field->isMutable(); | |||
12462 | visitSubobjectCall(Subobj, lookupIn(Class, Quals, IsMutable)); | |||
12463 | } | |||
12464 | ||||
12465 | void SpecialMemberExceptionSpecInfo::visitSubobjectCall( | |||
12466 | Subobject Subobj, Sema::SpecialMemberOverloadResult SMOR) { | |||
12467 | // Note, if lookup fails, it doesn't matter what exception specification we | |||
12468 | // choose because the special member will be deleted. | |||
12469 | if (CXXMethodDecl *MD = SMOR.getMethod()) | |||
12470 | ExceptSpec.CalledDecl(getSubobjectLoc(Subobj), MD); | |||
12471 | } | |||
12472 | ||||
12473 | bool Sema::tryResolveExplicitSpecifier(ExplicitSpecifier &ExplicitSpec) { | |||
12474 | llvm::APSInt Result; | |||
12475 | ExprResult Converted = CheckConvertedConstantExpression( | |||
12476 | ExplicitSpec.getExpr(), Context.BoolTy, Result, CCEK_ExplicitBool); | |||
12477 | ExplicitSpec.setExpr(Converted.get()); | |||
12478 | if (Converted.isUsable() && !Converted.get()->isValueDependent()) { | |||
12479 | ExplicitSpec.setKind(Result.getBoolValue() | |||
12480 | ? ExplicitSpecKind::ResolvedTrue | |||
12481 | : ExplicitSpecKind::ResolvedFalse); | |||
12482 | return true; | |||
12483 | } | |||
12484 | ExplicitSpec.setKind(ExplicitSpecKind::Unresolved); | |||
12485 | return false; | |||
12486 | } | |||
12487 | ||||
12488 | ExplicitSpecifier Sema::ActOnExplicitBoolSpecifier(Expr *ExplicitExpr) { | |||
12489 | ExplicitSpecifier ES(ExplicitExpr, ExplicitSpecKind::Unresolved); | |||
12490 | if (!ExplicitExpr->isTypeDependent()) | |||
12491 | tryResolveExplicitSpecifier(ES); | |||
12492 | return ES; | |||
12493 | } | |||
12494 | ||||
12495 | static Sema::ImplicitExceptionSpecification | |||
12496 | ComputeDefaultedSpecialMemberExceptionSpec( | |||
12497 | Sema &S, SourceLocation Loc, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM, | |||
12498 | Sema::InheritedConstructorInfo *ICI) { | |||
12499 | ComputingExceptionSpec CES(S, MD, Loc); | |||
12500 | ||||
12501 | CXXRecordDecl *ClassDecl = MD->getParent(); | |||
12502 | ||||
12503 | // C++ [except.spec]p14: | |||
12504 | // An implicitly declared special member function (Clause 12) shall have an | |||
12505 | // exception-specification. [...] | |||
12506 | SpecialMemberExceptionSpecInfo Info(S, MD, CSM, ICI, MD->getLocation()); | |||
12507 | if (ClassDecl->isInvalidDecl()) | |||
12508 | return Info.ExceptSpec; | |||
12509 | ||||
12510 | // FIXME: If this diagnostic fires, we're probably missing a check for | |||
12511 | // attempting to resolve an exception specification before it's known | |||
12512 | // at a higher level. | |||
12513 | if (S.RequireCompleteType(MD->getLocation(), | |||
12514 | S.Context.getRecordType(ClassDecl), | |||
12515 | diag::err_exception_spec_incomplete_type)) | |||
12516 | return Info.ExceptSpec; | |||
12517 | ||||
12518 | // C++1z [except.spec]p7: | |||
12519 | // [Look for exceptions thrown by] a constructor selected [...] to | |||
12520 | // initialize a potentially constructed subobject, | |||
12521 | // C++1z [except.spec]p8: | |||
12522 | // The exception specification for an implicitly-declared destructor, or a | |||
12523 | // destructor without a noexcept-specifier, is potentially-throwing if and | |||
12524 | // only if any of the destructors for any of its potentially constructed | |||
12525 | // subojects is potentially throwing. | |||
12526 | // FIXME: We respect the first rule but ignore the "potentially constructed" | |||
12527 | // in the second rule to resolve a core issue (no number yet) that would have | |||
12528 | // us reject: | |||
12529 | // struct A { virtual void f() = 0; virtual ~A() noexcept(false) = 0; }; | |||
12530 | // struct B : A {}; | |||
12531 | // struct C : B { void f(); }; | |||
12532 | // ... due to giving B::~B() a non-throwing exception specification. | |||
12533 | Info.visit(Info.IsConstructor ? Info.VisitPotentiallyConstructedBases | |||
12534 | : Info.VisitAllBases); | |||
12535 | ||||
12536 | return Info.ExceptSpec; | |||
12537 | } | |||
12538 | ||||
12539 | namespace { | |||
12540 | /// RAII object to register a special member as being currently declared. | |||
12541 | struct DeclaringSpecialMember { | |||
12542 | Sema &S; | |||
12543 | Sema::SpecialMemberDecl D; | |||
12544 | Sema::ContextRAII SavedContext; | |||
12545 | bool WasAlreadyBeingDeclared; | |||
12546 | ||||
12547 | DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM) | |||
12548 | : S(S), D(RD, CSM), SavedContext(S, RD) { | |||
12549 | WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D).second; | |||
12550 | if (WasAlreadyBeingDeclared) | |||
12551 | // This almost never happens, but if it does, ensure that our cache | |||
12552 | // doesn't contain a stale result. | |||
12553 | S.SpecialMemberCache.clear(); | |||
12554 | else { | |||
12555 | // Register a note to be produced if we encounter an error while | |||
12556 | // declaring the special member. | |||
12557 | Sema::CodeSynthesisContext Ctx; | |||
12558 | Ctx.Kind = Sema::CodeSynthesisContext::DeclaringSpecialMember; | |||
12559 | // FIXME: We don't have a location to use here. Using the class's | |||
12560 | // location maintains the fiction that we declare all special members | |||
12561 | // with the class, but (1) it's not clear that lying about that helps our | |||
12562 | // users understand what's going on, and (2) there may be outer contexts | |||
12563 | // on the stack (some of which are relevant) and printing them exposes | |||
12564 | // our lies. | |||
12565 | Ctx.PointOfInstantiation = RD->getLocation(); | |||
12566 | Ctx.Entity = RD; | |||
12567 | Ctx.SpecialMember = CSM; | |||
12568 | S.pushCodeSynthesisContext(Ctx); | |||
12569 | } | |||
12570 | } | |||
12571 | ~DeclaringSpecialMember() { | |||
12572 | if (!WasAlreadyBeingDeclared) { | |||
12573 | S.SpecialMembersBeingDeclared.erase(D); | |||
12574 | S.popCodeSynthesisContext(); | |||
12575 | } | |||
12576 | } | |||
12577 | ||||
12578 | /// Are we already trying to declare this special member? | |||
12579 | bool isAlreadyBeingDeclared() const { | |||
12580 | return WasAlreadyBeingDeclared; | |||
12581 | } | |||
12582 | }; | |||
12583 | } | |||
12584 | ||||
12585 | void Sema::CheckImplicitSpecialMemberDeclaration(Scope *S, FunctionDecl *FD) { | |||
12586 | // Look up any existing declarations, but don't trigger declaration of all | |||
12587 | // implicit special members with this name. | |||
12588 | DeclarationName Name = FD->getDeclName(); | |||
12589 | LookupResult R(*this, Name, SourceLocation(), LookupOrdinaryName, | |||
12590 | ForExternalRedeclaration); | |||
12591 | for (auto *D : FD->getParent()->lookup(Name)) | |||
12592 | if (auto *Acceptable = R.getAcceptableDecl(D)) | |||
12593 | R.addDecl(Acceptable); | |||
12594 | R.resolveKind(); | |||
12595 | R.suppressDiagnostics(); | |||
12596 | ||||
12597 | CheckFunctionDeclaration(S, FD, R, /*IsMemberSpecialization*/false); | |||
12598 | } | |||
12599 | ||||
12600 | void Sema::setupImplicitSpecialMemberType(CXXMethodDecl *SpecialMem, | |||
12601 | QualType ResultTy, | |||
12602 | ArrayRef<QualType> Args) { | |||
12603 | // Build an exception specification pointing back at this constructor. | |||
12604 | FunctionProtoType::ExtProtoInfo EPI = getImplicitMethodEPI(*this, SpecialMem); | |||
12605 | ||||
12606 | LangAS AS = getDefaultCXXMethodAddrSpace(); | |||
12607 | if (AS != LangAS::Default) { | |||
12608 | EPI.TypeQuals.addAddressSpace(AS); | |||
12609 | } | |||
12610 | ||||
12611 | auto QT = Context.getFunctionType(ResultTy, Args, EPI); | |||
12612 | SpecialMem->setType(QT); | |||
12613 | } | |||
12614 | ||||
12615 | CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( | |||
12616 | CXXRecordDecl *ClassDecl) { | |||
12617 | // C++ [class.ctor]p5: | |||
12618 | // A default constructor for a class X is a constructor of class X | |||
12619 | // that can be called without an argument. If there is no | |||
12620 | // user-declared constructor for class X, a default constructor is | |||
12621 | // implicitly declared. An implicitly-declared default constructor | |||
12622 | // is an inline public member of its class. | |||
12623 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12624, __PRETTY_FUNCTION__)) | |||
12624 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12624, __PRETTY_FUNCTION__)); | |||
12625 | ||||
12626 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor); | |||
12627 | if (DSM.isAlreadyBeingDeclared()) | |||
12628 | return nullptr; | |||
12629 | ||||
12630 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, | |||
12631 | CXXDefaultConstructor, | |||
12632 | false); | |||
12633 | ||||
12634 | // Create the actual constructor declaration. | |||
12635 | CanQualType ClassType | |||
12636 | = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); | |||
12637 | SourceLocation ClassLoc = ClassDecl->getLocation(); | |||
12638 | DeclarationName Name | |||
12639 | = Context.DeclarationNames.getCXXConstructorName(ClassType); | |||
12640 | DeclarationNameInfo NameInfo(Name, ClassLoc); | |||
12641 | CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( | |||
12642 | Context, ClassDecl, ClassLoc, NameInfo, /*Type*/ QualType(), | |||
12643 | /*TInfo=*/nullptr, ExplicitSpecifier(), | |||
12644 | /*isInline=*/true, /*isImplicitlyDeclared=*/true, | |||
12645 | Constexpr ? CSK_constexpr : CSK_unspecified); | |||
12646 | DefaultCon->setAccess(AS_public); | |||
12647 | DefaultCon->setDefaulted(); | |||
12648 | ||||
12649 | if (getLangOpts().CUDA) { | |||
12650 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXDefaultConstructor, | |||
12651 | DefaultCon, | |||
12652 | /* ConstRHS */ false, | |||
12653 | /* Diagnose */ false); | |||
12654 | } | |||
12655 | ||||
12656 | setupImplicitSpecialMemberType(DefaultCon, Context.VoidTy, None); | |||
12657 | ||||
12658 | // We don't need to use SpecialMemberIsTrivial here; triviality for default | |||
12659 | // constructors is easy to compute. | |||
12660 | DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); | |||
12661 | ||||
12662 | // Note that we have declared this constructor. | |||
12663 | ++getASTContext().NumImplicitDefaultConstructorsDeclared; | |||
12664 | ||||
12665 | Scope *S = getScopeForContext(ClassDecl); | |||
12666 | CheckImplicitSpecialMemberDeclaration(S, DefaultCon); | |||
12667 | ||||
12668 | if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) | |||
12669 | SetDeclDeleted(DefaultCon, ClassLoc); | |||
12670 | ||||
12671 | if (S) | |||
12672 | PushOnScopeChains(DefaultCon, S, false); | |||
12673 | ClassDecl->addDecl(DefaultCon); | |||
12674 | ||||
12675 | return DefaultCon; | |||
12676 | } | |||
12677 | ||||
12678 | void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, | |||
12679 | CXXConstructorDecl *Constructor) { | |||
12680 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12683, __PRETTY_FUNCTION__)) | |||
12681 | !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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12683, __PRETTY_FUNCTION__)) | |||
12682 | !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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12683, __PRETTY_FUNCTION__)) | |||
12683 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12683, __PRETTY_FUNCTION__)); | |||
12684 | if (Constructor->willHaveBody() || Constructor->isInvalidDecl()) | |||
12685 | return; | |||
12686 | ||||
12687 | CXXRecordDecl *ClassDecl = Constructor->getParent(); | |||
12688 | assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor")((ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl && \"DefineImplicitDefaultConstructor - invalid constructor\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12688, __PRETTY_FUNCTION__)); | |||
12689 | ||||
12690 | SynthesizedFunctionScope Scope(*this, Constructor); | |||
12691 | ||||
12692 | // The exception specification is needed because we are defining the | |||
12693 | // function. | |||
12694 | ResolveExceptionSpec(CurrentLocation, | |||
12695 | Constructor->getType()->castAs<FunctionProtoType>()); | |||
12696 | MarkVTableUsed(CurrentLocation, ClassDecl); | |||
12697 | ||||
12698 | // Add a context note for diagnostics produced after this point. | |||
12699 | Scope.addContextNote(CurrentLocation); | |||
12700 | ||||
12701 | if (SetCtorInitializers(Constructor, /*AnyErrors=*/false)) { | |||
12702 | Constructor->setInvalidDecl(); | |||
12703 | return; | |||
12704 | } | |||
12705 | ||||
12706 | SourceLocation Loc = Constructor->getEndLoc().isValid() | |||
12707 | ? Constructor->getEndLoc() | |||
12708 | : Constructor->getLocation(); | |||
12709 | Constructor->setBody(new (Context) CompoundStmt(Loc)); | |||
12710 | Constructor->markUsed(Context); | |||
12711 | ||||
12712 | if (ASTMutationListener *L = getASTMutationListener()) { | |||
12713 | L->CompletedImplicitDefinition(Constructor); | |||
12714 | } | |||
12715 | ||||
12716 | DiagnoseUninitializedFields(*this, Constructor); | |||
12717 | } | |||
12718 | ||||
12719 | void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { | |||
12720 | // Perform any delayed checks on exception specifications. | |||
12721 | CheckDelayedMemberExceptionSpecs(); | |||
12722 | } | |||
12723 | ||||
12724 | /// Find or create the fake constructor we synthesize to model constructing an | |||
12725 | /// object of a derived class via a constructor of a base class. | |||
12726 | CXXConstructorDecl * | |||
12727 | Sema::findInheritingConstructor(SourceLocation Loc, | |||
12728 | CXXConstructorDecl *BaseCtor, | |||
12729 | ConstructorUsingShadowDecl *Shadow) { | |||
12730 | CXXRecordDecl *Derived = Shadow->getParent(); | |||
12731 | SourceLocation UsingLoc = Shadow->getLocation(); | |||
12732 | ||||
12733 | // FIXME: Add a new kind of DeclarationName for an inherited constructor. | |||
12734 | // For now we use the name of the base class constructor as a member of the | |||
12735 | // derived class to indicate a (fake) inherited constructor name. | |||
12736 | DeclarationName Name = BaseCtor->getDeclName(); | |||
12737 | ||||
12738 | // Check to see if we already have a fake constructor for this inherited | |||
12739 | // constructor call. | |||
12740 | for (NamedDecl *Ctor : Derived->lookup(Name)) | |||
12741 | if (declaresSameEntity(cast<CXXConstructorDecl>(Ctor) | |||
12742 | ->getInheritedConstructor() | |||
12743 | .getConstructor(), | |||
12744 | BaseCtor)) | |||
12745 | return cast<CXXConstructorDecl>(Ctor); | |||
12746 | ||||
12747 | DeclarationNameInfo NameInfo(Name, UsingLoc); | |||
12748 | TypeSourceInfo *TInfo = | |||
12749 | Context.getTrivialTypeSourceInfo(BaseCtor->getType(), UsingLoc); | |||
12750 | FunctionProtoTypeLoc ProtoLoc = | |||
12751 | TInfo->getTypeLoc().IgnoreParens().castAs<FunctionProtoTypeLoc>(); | |||
12752 | ||||
12753 | // Check the inherited constructor is valid and find the list of base classes | |||
12754 | // from which it was inherited. | |||
12755 | InheritedConstructorInfo ICI(*this, Loc, Shadow); | |||
12756 | ||||
12757 | bool Constexpr = | |||
12758 | BaseCtor->isConstexpr() && | |||
12759 | defaultedSpecialMemberIsConstexpr(*this, Derived, CXXDefaultConstructor, | |||
12760 | false, BaseCtor, &ICI); | |||
12761 | ||||
12762 | CXXConstructorDecl *DerivedCtor = CXXConstructorDecl::Create( | |||
12763 | Context, Derived, UsingLoc, NameInfo, TInfo->getType(), TInfo, | |||
12764 | BaseCtor->getExplicitSpecifier(), /*isInline=*/true, | |||
12765 | /*isImplicitlyDeclared=*/true, | |||
12766 | Constexpr ? BaseCtor->getConstexprKind() : CSK_unspecified, | |||
12767 | InheritedConstructor(Shadow, BaseCtor), | |||
12768 | BaseCtor->getTrailingRequiresClause()); | |||
12769 | if (Shadow->isInvalidDecl()) | |||
12770 | DerivedCtor->setInvalidDecl(); | |||
12771 | ||||
12772 | // Build an unevaluated exception specification for this fake constructor. | |||
12773 | const FunctionProtoType *FPT = TInfo->getType()->castAs<FunctionProtoType>(); | |||
12774 | FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); | |||
12775 | EPI.ExceptionSpec.Type = EST_Unevaluated; | |||
12776 | EPI.ExceptionSpec.SourceDecl = DerivedCtor; | |||
12777 | DerivedCtor->setType(Context.getFunctionType(FPT->getReturnType(), | |||
12778 | FPT->getParamTypes(), EPI)); | |||
12779 | ||||
12780 | // Build the parameter declarations. | |||
12781 | SmallVector<ParmVarDecl *, 16> ParamDecls; | |||
12782 | for (unsigned I = 0, N = FPT->getNumParams(); I != N; ++I) { | |||
12783 | TypeSourceInfo *TInfo = | |||
12784 | Context.getTrivialTypeSourceInfo(FPT->getParamType(I), UsingLoc); | |||
12785 | ParmVarDecl *PD = ParmVarDecl::Create( | |||
12786 | Context, DerivedCtor, UsingLoc, UsingLoc, /*IdentifierInfo=*/nullptr, | |||
12787 | FPT->getParamType(I), TInfo, SC_None, /*DefArg=*/nullptr); | |||
12788 | PD->setScopeInfo(0, I); | |||
12789 | PD->setImplicit(); | |||
12790 | // Ensure attributes are propagated onto parameters (this matters for | |||
12791 | // format, pass_object_size, ...). | |||
12792 | mergeDeclAttributes(PD, BaseCtor->getParamDecl(I)); | |||
12793 | ParamDecls.push_back(PD); | |||
12794 | ProtoLoc.setParam(I, PD); | |||
12795 | } | |||
12796 | ||||
12797 | // Set up the new constructor. | |||
12798 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12798, __PRETTY_FUNCTION__)); | |||
12799 | DerivedCtor->setAccess(BaseCtor->getAccess()); | |||
12800 | DerivedCtor->setParams(ParamDecls); | |||
12801 | Derived->addDecl(DerivedCtor); | |||
12802 | ||||
12803 | if (ShouldDeleteSpecialMember(DerivedCtor, CXXDefaultConstructor, &ICI)) | |||
12804 | SetDeclDeleted(DerivedCtor, UsingLoc); | |||
12805 | ||||
12806 | return DerivedCtor; | |||
12807 | } | |||
12808 | ||||
12809 | void Sema::NoteDeletedInheritingConstructor(CXXConstructorDecl *Ctor) { | |||
12810 | InheritedConstructorInfo ICI(*this, Ctor->getLocation(), | |||
12811 | Ctor->getInheritedConstructor().getShadowDecl()); | |||
12812 | ShouldDeleteSpecialMember(Ctor, CXXDefaultConstructor, &ICI, | |||
12813 | /*Diagnose*/true); | |||
12814 | } | |||
12815 | ||||
12816 | void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation, | |||
12817 | CXXConstructorDecl *Constructor) { | |||
12818 | CXXRecordDecl *ClassDecl = Constructor->getParent(); | |||
12819 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12821, __PRETTY_FUNCTION__)) | |||
12820 | !Constructor->doesThisDeclarationHaveABody() &&((Constructor->getInheritedConstructor() && !Constructor ->doesThisDeclarationHaveABody() && !Constructor-> isDeleted()) ? static_cast<void> (0) : __assert_fail ("Constructor->getInheritedConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12821, __PRETTY_FUNCTION__)) | |||
12821 | !Constructor->isDeleted())((Constructor->getInheritedConstructor() && !Constructor ->doesThisDeclarationHaveABody() && !Constructor-> isDeleted()) ? static_cast<void> (0) : __assert_fail ("Constructor->getInheritedConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12821, __PRETTY_FUNCTION__)); | |||
12822 | if (Constructor->willHaveBody() || Constructor->isInvalidDecl()) | |||
12823 | return; | |||
12824 | ||||
12825 | // Initializations are performed "as if by a defaulted default constructor", | |||
12826 | // so enter the appropriate scope. | |||
12827 | SynthesizedFunctionScope Scope(*this, Constructor); | |||
12828 | ||||
12829 | // The exception specification is needed because we are defining the | |||
12830 | // function. | |||
12831 | ResolveExceptionSpec(CurrentLocation, | |||
12832 | Constructor->getType()->castAs<FunctionProtoType>()); | |||
12833 | MarkVTableUsed(CurrentLocation, ClassDecl); | |||
12834 | ||||
12835 | // Add a context note for diagnostics produced after this point. | |||
12836 | Scope.addContextNote(CurrentLocation); | |||
12837 | ||||
12838 | ConstructorUsingShadowDecl *Shadow = | |||
12839 | Constructor->getInheritedConstructor().getShadowDecl(); | |||
12840 | CXXConstructorDecl *InheritedCtor = | |||
12841 | Constructor->getInheritedConstructor().getConstructor(); | |||
12842 | ||||
12843 | // [class.inhctor.init]p1: | |||
12844 | // initialization proceeds as if a defaulted default constructor is used to | |||
12845 | // initialize the D object and each base class subobject from which the | |||
12846 | // constructor was inherited | |||
12847 | ||||
12848 | InheritedConstructorInfo ICI(*this, CurrentLocation, Shadow); | |||
12849 | CXXRecordDecl *RD = Shadow->getParent(); | |||
12850 | SourceLocation InitLoc = Shadow->getLocation(); | |||
12851 | ||||
12852 | // Build explicit initializers for all base classes from which the | |||
12853 | // constructor was inherited. | |||
12854 | SmallVector<CXXCtorInitializer*, 8> Inits; | |||
12855 | for (bool VBase : {false, true}) { | |||
12856 | for (CXXBaseSpecifier &B : VBase ? RD->vbases() : RD->bases()) { | |||
12857 | if (B.isVirtual() != VBase) | |||
12858 | continue; | |||
12859 | ||||
12860 | auto *BaseRD = B.getType()->getAsCXXRecordDecl(); | |||
12861 | if (!BaseRD) | |||
12862 | continue; | |||
12863 | ||||
12864 | auto BaseCtor = ICI.findConstructorForBase(BaseRD, InheritedCtor); | |||
12865 | if (!BaseCtor.first) | |||
12866 | continue; | |||
12867 | ||||
12868 | MarkFunctionReferenced(CurrentLocation, BaseCtor.first); | |||
12869 | ExprResult Init = new (Context) CXXInheritedCtorInitExpr( | |||
12870 | InitLoc, B.getType(), BaseCtor.first, VBase, BaseCtor.second); | |||
12871 | ||||
12872 | auto *TInfo = Context.getTrivialTypeSourceInfo(B.getType(), InitLoc); | |||
12873 | Inits.push_back(new (Context) CXXCtorInitializer( | |||
12874 | Context, TInfo, VBase, InitLoc, Init.get(), InitLoc, | |||
12875 | SourceLocation())); | |||
12876 | } | |||
12877 | } | |||
12878 | ||||
12879 | // We now proceed as if for a defaulted default constructor, with the relevant | |||
12880 | // initializers replaced. | |||
12881 | ||||
12882 | if (SetCtorInitializers(Constructor, /*AnyErrors*/false, Inits)) { | |||
12883 | Constructor->setInvalidDecl(); | |||
12884 | return; | |||
12885 | } | |||
12886 | ||||
12887 | Constructor->setBody(new (Context) CompoundStmt(InitLoc)); | |||
12888 | Constructor->markUsed(Context); | |||
12889 | ||||
12890 | if (ASTMutationListener *L = getASTMutationListener()) { | |||
12891 | L->CompletedImplicitDefinition(Constructor); | |||
12892 | } | |||
12893 | ||||
12894 | DiagnoseUninitializedFields(*this, Constructor); | |||
12895 | } | |||
12896 | ||||
12897 | CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { | |||
12898 | // C++ [class.dtor]p2: | |||
12899 | // If a class has no user-declared destructor, a destructor is | |||
12900 | // declared implicitly. An implicitly-declared destructor is an | |||
12901 | // inline public member of its class. | |||
12902 | assert(ClassDecl->needsImplicitDestructor())((ClassDecl->needsImplicitDestructor()) ? static_cast<void > (0) : __assert_fail ("ClassDecl->needsImplicitDestructor()" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12902, __PRETTY_FUNCTION__)); | |||
12903 | ||||
12904 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor); | |||
12905 | if (DSM.isAlreadyBeingDeclared()) | |||
12906 | return nullptr; | |||
12907 | ||||
12908 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, | |||
12909 | CXXDestructor, | |||
12910 | false); | |||
12911 | ||||
12912 | // Create the actual destructor declaration. | |||
12913 | CanQualType ClassType | |||
12914 | = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); | |||
12915 | SourceLocation ClassLoc = ClassDecl->getLocation(); | |||
12916 | DeclarationName Name | |||
12917 | = Context.DeclarationNames.getCXXDestructorName(ClassType); | |||
12918 | DeclarationNameInfo NameInfo(Name, ClassLoc); | |||
12919 | CXXDestructorDecl *Destructor = | |||
12920 | CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, | |||
12921 | QualType(), nullptr, /*isInline=*/true, | |||
12922 | /*isImplicitlyDeclared=*/true, | |||
12923 | Constexpr ? CSK_constexpr : CSK_unspecified); | |||
12924 | Destructor->setAccess(AS_public); | |||
12925 | Destructor->setDefaulted(); | |||
12926 | ||||
12927 | if (getLangOpts().CUDA) { | |||
12928 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXDestructor, | |||
12929 | Destructor, | |||
12930 | /* ConstRHS */ false, | |||
12931 | /* Diagnose */ false); | |||
12932 | } | |||
12933 | ||||
12934 | setupImplicitSpecialMemberType(Destructor, Context.VoidTy, None); | |||
12935 | ||||
12936 | // We don't need to use SpecialMemberIsTrivial here; triviality for | |||
12937 | // destructors is easy to compute. | |||
12938 | Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); | |||
12939 | Destructor->setTrivialForCall(ClassDecl->hasAttr<TrivialABIAttr>() || | |||
12940 | ClassDecl->hasTrivialDestructorForCall()); | |||
12941 | ||||
12942 | // Note that we have declared this destructor. | |||
12943 | ++getASTContext().NumImplicitDestructorsDeclared; | |||
12944 | ||||
12945 | Scope *S = getScopeForContext(ClassDecl); | |||
12946 | CheckImplicitSpecialMemberDeclaration(S, Destructor); | |||
12947 | ||||
12948 | // We can't check whether an implicit destructor is deleted before we complete | |||
12949 | // the definition of the class, because its validity depends on the alignment | |||
12950 | // of the class. We'll check this from ActOnFields once the class is complete. | |||
12951 | if (ClassDecl->isCompleteDefinition() && | |||
12952 | ShouldDeleteSpecialMember(Destructor, CXXDestructor)) | |||
12953 | SetDeclDeleted(Destructor, ClassLoc); | |||
12954 | ||||
12955 | // Introduce this destructor into its scope. | |||
12956 | if (S) | |||
12957 | PushOnScopeChains(Destructor, S, false); | |||
12958 | ClassDecl->addDecl(Destructor); | |||
12959 | ||||
12960 | return Destructor; | |||
12961 | } | |||
12962 | ||||
12963 | void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, | |||
12964 | CXXDestructorDecl *Destructor) { | |||
12965 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12968, __PRETTY_FUNCTION__)) | |||
12966 | !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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12968, __PRETTY_FUNCTION__)) | |||
12967 | !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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12968, __PRETTY_FUNCTION__)) | |||
12968 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12968, __PRETTY_FUNCTION__)); | |||
12969 | if (Destructor->willHaveBody() || Destructor->isInvalidDecl()) | |||
12970 | return; | |||
12971 | ||||
12972 | CXXRecordDecl *ClassDecl = Destructor->getParent(); | |||
12973 | assert(ClassDecl && "DefineImplicitDestructor - invalid destructor")((ClassDecl && "DefineImplicitDestructor - invalid destructor" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl && \"DefineImplicitDestructor - invalid destructor\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 12973, __PRETTY_FUNCTION__)); | |||
12974 | ||||
12975 | SynthesizedFunctionScope Scope(*this, Destructor); | |||
12976 | ||||
12977 | // The exception specification is needed because we are defining the | |||
12978 | // function. | |||
12979 | ResolveExceptionSpec(CurrentLocation, | |||
12980 | Destructor->getType()->castAs<FunctionProtoType>()); | |||
12981 | MarkVTableUsed(CurrentLocation, ClassDecl); | |||
12982 | ||||
12983 | // Add a context note for diagnostics produced after this point. | |||
12984 | Scope.addContextNote(CurrentLocation); | |||
12985 | ||||
12986 | MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), | |||
12987 | Destructor->getParent()); | |||
12988 | ||||
12989 | if (CheckDestructor(Destructor)) { | |||
12990 | Destructor->setInvalidDecl(); | |||
12991 | return; | |||
12992 | } | |||
12993 | ||||
12994 | SourceLocation Loc = Destructor->getEndLoc().isValid() | |||
12995 | ? Destructor->getEndLoc() | |||
12996 | : Destructor->getLocation(); | |||
12997 | Destructor->setBody(new (Context) CompoundStmt(Loc)); | |||
12998 | Destructor->markUsed(Context); | |||
12999 | ||||
13000 | if (ASTMutationListener *L = getASTMutationListener()) { | |||
13001 | L->CompletedImplicitDefinition(Destructor); | |||
13002 | } | |||
13003 | } | |||
13004 | ||||
13005 | /// Perform any semantic analysis which needs to be delayed until all | |||
13006 | /// pending class member declarations have been parsed. | |||
13007 | void Sema::ActOnFinishCXXMemberDecls() { | |||
13008 | // If the context is an invalid C++ class, just suppress these checks. | |||
13009 | if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) { | |||
13010 | if (Record->isInvalidDecl()) { | |||
13011 | DelayedOverridingExceptionSpecChecks.clear(); | |||
13012 | DelayedEquivalentExceptionSpecChecks.clear(); | |||
13013 | return; | |||
13014 | } | |||
13015 | checkForMultipleExportedDefaultConstructors(*this, Record); | |||
13016 | } | |||
13017 | } | |||
13018 | ||||
13019 | void Sema::ActOnFinishCXXNonNestedClass() { | |||
13020 | referenceDLLExportedClassMethods(); | |||
13021 | ||||
13022 | if (!DelayedDllExportMemberFunctions.empty()) { | |||
| ||||
13023 | SmallVector<CXXMethodDecl*, 4> WorkList; | |||
13024 | std::swap(DelayedDllExportMemberFunctions, WorkList); | |||
13025 | for (CXXMethodDecl *M : WorkList) { | |||
13026 | DefineImplicitSpecialMember(*this, M, M->getLocation()); | |||
13027 | ||||
13028 | // Pass the method to the consumer to get emitted. This is not necessary | |||
13029 | // for explicit instantiation definitions, as they will get emitted | |||
13030 | // anyway. | |||
13031 | if (M->getParent()->getTemplateSpecializationKind() != | |||
13032 | TSK_ExplicitInstantiationDefinition) | |||
13033 | ActOnFinishInlineFunctionDef(M); | |||
13034 | } | |||
13035 | } | |||
13036 | } | |||
13037 | ||||
13038 | void Sema::referenceDLLExportedClassMethods() { | |||
13039 | if (!DelayedDllExportClasses.empty()) { | |||
13040 | // Calling ReferenceDllExportedMembers might cause the current function to | |||
13041 | // be called again, so use a local copy of DelayedDllExportClasses. | |||
13042 | SmallVector<CXXRecordDecl *, 4> WorkList; | |||
13043 | std::swap(DelayedDllExportClasses, WorkList); | |||
13044 | for (CXXRecordDecl *Class : WorkList) | |||
13045 | ReferenceDllExportedMembers(*this, Class); | |||
13046 | } | |||
13047 | } | |||
13048 | ||||
13049 | void Sema::AdjustDestructorExceptionSpec(CXXDestructorDecl *Destructor) { | |||
13050 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 13051, __PRETTY_FUNCTION__)) | |||
13051 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 13051, __PRETTY_FUNCTION__)); | |||
13052 | ||||
13053 | if (Destructor->isDependentContext()) | |||
13054 | return; | |||
13055 | ||||
13056 | // C++11 [class.dtor]p3: | |||
13057 | // A declaration of a destructor that does not have an exception- | |||
13058 | // specification is implicitly considered to have the same exception- | |||
13059 | // specification as an implicit declaration. | |||
13060 | const auto *DtorType = Destructor->getType()->castAs<FunctionProtoType>(); | |||
13061 | if (DtorType->hasExceptionSpec()) | |||
13062 | return; | |||
13063 | ||||
13064 | // Replace the destructor's type, building off the existing one. Fortunately, | |||
13065 | // the only thing of interest in the destructor type is its extended info. | |||
13066 | // The return and arguments are fixed. | |||
13067 | FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); | |||
13068 | EPI.ExceptionSpec.Type = EST_Unevaluated; | |||
13069 | EPI.ExceptionSpec.SourceDecl = Destructor; | |||
13070 | Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); | |||
13071 | ||||
13072 | // FIXME: If the destructor has a body that could throw, and the newly created | |||
13073 | // spec doesn't allow exceptions, we should emit a warning, because this | |||
13074 | // change in behavior can break conforming C++03 programs at runtime. | |||
13075 | // However, we don't have a body or an exception specification yet, so it | |||
13076 | // needs to be done somewhere else. | |||
13077 | } | |||
13078 | ||||
13079 | namespace { | |||
13080 | /// An abstract base class for all helper classes used in building the | |||
13081 | // copy/move operators. These classes serve as factory functions and help us | |||
13082 | // avoid using the same Expr* in the AST twice. | |||
13083 | class ExprBuilder { | |||
13084 | ExprBuilder(const ExprBuilder&) = delete; | |||
13085 | ExprBuilder &operator=(const ExprBuilder&) = delete; | |||
13086 | ||||
13087 | protected: | |||
13088 | static Expr *assertNotNull(Expr *E) { | |||
13089 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 13089, __PRETTY_FUNCTION__)); | |||
13090 | return E; | |||
13091 | } | |||
13092 | ||||
13093 | public: | |||
13094 | ExprBuilder() {} | |||
13095 | virtual ~ExprBuilder() {} | |||
13096 | ||||
13097 | virtual Expr *build(Sema &S, SourceLocation Loc) const = 0; | |||
13098 | }; | |||
13099 | ||||
13100 | class RefBuilder: public ExprBuilder { | |||
13101 | VarDecl *Var; | |||
13102 | QualType VarType; | |||
13103 | ||||
13104 | public: | |||
13105 | Expr *build(Sema &S, SourceLocation Loc) const override { | |||
13106 | return assertNotNull(S.BuildDeclRefExpr(Var, VarType, VK_LValue, Loc)); | |||
13107 | } | |||
13108 | ||||
13109 | RefBuilder(VarDecl *Var, QualType VarType) | |||
13110 | : Var(Var), VarType(VarType) {} | |||
13111 | }; | |||
13112 | ||||
13113 | class ThisBuilder: public ExprBuilder { | |||
13114 | public: | |||
13115 | Expr *build(Sema &S, SourceLocation Loc) const override { | |||
13116 | return assertNotNull(S.ActOnCXXThis(Loc).getAs<Expr>()); | |||
13117 | } | |||
13118 | }; | |||
13119 | ||||
13120 | class CastBuilder: public ExprBuilder { | |||
13121 | const ExprBuilder &Builder; | |||
13122 | QualType Type; | |||
13123 | ExprValueKind Kind; | |||
13124 | const CXXCastPath &Path; | |||
13125 | ||||
13126 | public: | |||
13127 | Expr *build(Sema &S, SourceLocation Loc) const override { | |||
13128 | return assertNotNull(S.ImpCastExprToType(Builder.build(S, Loc), Type, | |||
13129 | CK_UncheckedDerivedToBase, Kind, | |||
13130 | &Path).get()); | |||
13131 | } | |||
13132 | ||||
13133 | CastBuilder(const ExprBuilder &Builder, QualType Type, ExprValueKind Kind, | |||
13134 | const CXXCastPath &Path) | |||
13135 | : Builder(Builder), Type(Type), Kind(Kind), Path(Path) {} | |||
13136 | }; | |||
13137 | ||||
13138 | class DerefBuilder: public ExprBuilder { | |||
13139 | const ExprBuilder &Builder; | |||
13140 | ||||
13141 | public: | |||
13142 | Expr *build(Sema &S, SourceLocation Loc) const override { | |||
13143 | return assertNotNull( | |||
13144 | S.CreateBuiltinUnaryOp(Loc, UO_Deref, Builder.build(S, Loc)).get()); | |||
13145 | } | |||
13146 | ||||
13147 | DerefBuilder(const ExprBuilder &Builder) : Builder(Builder) {} | |||
13148 | }; | |||
13149 | ||||
13150 | class MemberBuilder: public ExprBuilder { | |||
13151 | const ExprBuilder &Builder; | |||
13152 | QualType Type; | |||
13153 | CXXScopeSpec SS; | |||
13154 | bool IsArrow; | |||
13155 | LookupResult &MemberLookup; | |||
13156 | ||||
13157 | public: | |||
13158 | Expr *build(Sema &S, SourceLocation Loc) const override { | |||
13159 | return assertNotNull(S.BuildMemberReferenceExpr( | |||
13160 | Builder.build(S, Loc), Type, Loc, IsArrow, SS, SourceLocation(), | |||
13161 | nullptr, MemberLookup, nullptr, nullptr).get()); | |||
13162 | } | |||
13163 | ||||
13164 | MemberBuilder(const ExprBuilder &Builder, QualType Type, bool IsArrow, | |||
13165 | LookupResult &MemberLookup) | |||
13166 | : Builder(Builder), Type(Type), IsArrow(IsArrow), | |||
13167 | MemberLookup(MemberLookup) {} | |||
13168 | }; | |||
13169 | ||||
13170 | class MoveCastBuilder: public ExprBuilder { | |||
13171 | const ExprBuilder &Builder; | |||
13172 | ||||
13173 | public: | |||
13174 | Expr *build(Sema &S, SourceLocation Loc) const override { | |||
13175 | return assertNotNull(CastForMoving(S, Builder.build(S, Loc))); | |||
13176 | } | |||
13177 | ||||
13178 | MoveCastBuilder(const ExprBuilder &Builder) : Builder(Builder) {} | |||
13179 | }; | |||
13180 | ||||
13181 | class LvalueConvBuilder: public ExprBuilder { | |||
13182 | const ExprBuilder &Builder; | |||
13183 | ||||
13184 | public: | |||
13185 | Expr *build(Sema &S, SourceLocation Loc) const override { | |||
13186 | return assertNotNull( | |||
13187 | S.DefaultLvalueConversion(Builder.build(S, Loc)).get()); | |||
13188 | } | |||
13189 | ||||
13190 | LvalueConvBuilder(const ExprBuilder &Builder) : Builder(Builder) {} | |||
13191 | }; | |||
13192 | ||||
13193 | class SubscriptBuilder: public ExprBuilder { | |||
13194 | const ExprBuilder &Base; | |||
13195 | const ExprBuilder &Index; | |||
13196 | ||||
13197 | public: | |||
13198 | Expr *build(Sema &S, SourceLocation Loc) const override { | |||
13199 | return assertNotNull(S.CreateBuiltinArraySubscriptExpr( | |||
13200 | Base.build(S, Loc), Loc, Index.build(S, Loc), Loc).get()); | |||
13201 | } | |||
13202 | ||||
13203 | SubscriptBuilder(const ExprBuilder &Base, const ExprBuilder &Index) | |||
13204 | : Base(Base), Index(Index) {} | |||
13205 | }; | |||
13206 | ||||
13207 | } // end anonymous namespace | |||
13208 | ||||
13209 | /// When generating a defaulted copy or move assignment operator, if a field | |||
13210 | /// should be copied with __builtin_memcpy rather than via explicit assignments, | |||
13211 | /// do so. This optimization only applies for arrays of scalars, and for arrays | |||
13212 | /// of class type where the selected copy/move-assignment operator is trivial. | |||
13213 | static StmtResult | |||
13214 | buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, | |||
13215 | const ExprBuilder &ToB, const ExprBuilder &FromB) { | |||
13216 | // Compute the size of the memory buffer to be copied. | |||
13217 | QualType SizeType = S.Context.getSizeType(); | |||
13218 | llvm::APInt Size(S.Context.getTypeSize(SizeType), | |||
13219 | S.Context.getTypeSizeInChars(T).getQuantity()); | |||
13220 | ||||
13221 | // Take the address of the field references for "from" and "to". We | |||
13222 | // directly construct UnaryOperators here because semantic analysis | |||
13223 | // does not permit us to take the address of an xvalue. | |||
13224 | Expr *From = FromB.build(S, Loc); | |||
13225 | From = new (S.Context) UnaryOperator(From, UO_AddrOf, | |||
13226 | S.Context.getPointerType(From->getType()), | |||
13227 | VK_RValue, OK_Ordinary, Loc, false); | |||
13228 | Expr *To = ToB.build(S, Loc); | |||
13229 | To = new (S.Context) UnaryOperator(To, UO_AddrOf, | |||
13230 | S.Context.getPointerType(To->getType()), | |||
13231 | VK_RValue, OK_Ordinary, Loc, false); | |||
13232 | ||||
13233 | const Type *E = T->getBaseElementTypeUnsafe(); | |||
13234 | bool NeedsCollectableMemCpy = | |||
13235 | E->isRecordType() && | |||
13236 | E->castAs<RecordType>()->getDecl()->hasObjectMember(); | |||
13237 | ||||
13238 | // Create a reference to the __builtin_objc_memmove_collectable function | |||
13239 | StringRef MemCpyName = NeedsCollectableMemCpy ? | |||
13240 | "__builtin_objc_memmove_collectable" : | |||
13241 | "__builtin_memcpy"; | |||
13242 | LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc, | |||
13243 | Sema::LookupOrdinaryName); | |||
13244 | S.LookupName(R, S.TUScope, true); | |||
13245 | ||||
13246 | FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>(); | |||
13247 | if (!MemCpy) | |||
13248 | // Something went horribly wrong earlier, and we will have complained | |||
13249 | // about it. | |||
13250 | return StmtError(); | |||
13251 | ||||
13252 | ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy, | |||
13253 | VK_RValue, Loc, nullptr); | |||
13254 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 13254, __PRETTY_FUNCTION__)); | |||
13255 | ||||
13256 | Expr *CallArgs[] = { | |||
13257 | To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc) | |||
13258 | }; | |||
13259 | ExprResult Call = S.BuildCallExpr(/*Scope=*/nullptr, MemCpyRef.get(), | |||
13260 | Loc, CallArgs, Loc); | |||
13261 | ||||
13262 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 13262, __PRETTY_FUNCTION__)); | |||
13263 | return Call.getAs<Stmt>(); | |||
13264 | } | |||
13265 | ||||
13266 | /// Builds a statement that copies/moves the given entity from \p From to | |||
13267 | /// \c To. | |||
13268 | /// | |||
13269 | /// This routine is used to copy/move the members of a class with an | |||
13270 | /// implicitly-declared copy/move assignment operator. When the entities being | |||
13271 | /// copied are arrays, this routine builds for loops to copy them. | |||
13272 | /// | |||
13273 | /// \param S The Sema object used for type-checking. | |||
13274 | /// | |||
13275 | /// \param Loc The location where the implicit copy/move is being generated. | |||
13276 | /// | |||
13277 | /// \param T The type of the expressions being copied/moved. Both expressions | |||
13278 | /// must have this type. | |||
13279 | /// | |||
13280 | /// \param To The expression we are copying/moving to. | |||
13281 | /// | |||
13282 | /// \param From The expression we are copying/moving from. | |||
13283 | /// | |||
13284 | /// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. | |||
13285 | /// Otherwise, it's a non-static member subobject. | |||
13286 | /// | |||
13287 | /// \param Copying Whether we're copying or moving. | |||
13288 | /// | |||
13289 | /// \param Depth Internal parameter recording the depth of the recursion. | |||
13290 | /// | |||
13291 | /// \returns A statement or a loop that copies the expressions, or StmtResult(0) | |||
13292 | /// if a memcpy should be used instead. | |||
13293 | static StmtResult | |||
13294 | buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, | |||
13295 | const ExprBuilder &To, const ExprBuilder &From, | |||
13296 | bool CopyingBaseSubobject, bool Copying, | |||
13297 | unsigned Depth = 0) { | |||
13298 | // C++11 [class.copy]p28: | |||
13299 | // Each subobject is assigned in the manner appropriate to its type: | |||
13300 | // | |||
13301 | // - if the subobject is of class type, as if by a call to operator= with | |||
13302 | // the subobject as the object expression and the corresponding | |||
13303 | // subobject of x as a single function argument (as if by explicit | |||
13304 | // qualification; that is, ignoring any possible virtual overriding | |||
13305 | // functions in more derived classes); | |||
13306 | // | |||
13307 | // C++03 [class.copy]p13: | |||
13308 | // - if the subobject is of class type, the copy assignment operator for | |||
13309 | // the class is used (as if by explicit qualification; that is, | |||
13310 | // ignoring any possible virtual overriding functions in more derived | |||
13311 | // classes); | |||
13312 | if (const RecordType *RecordTy = T->getAs<RecordType>()) { | |||
13313 | CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); | |||
13314 | ||||
13315 | // Look for operator=. | |||
13316 | DeclarationName Name | |||
13317 | = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); | |||
13318 | LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); | |||
13319 | S.LookupQualifiedName(OpLookup, ClassDecl, false); | |||
13320 | ||||
13321 | // Prior to C++11, filter out any result that isn't a copy/move-assignment | |||
13322 | // operator. | |||
13323 | if (!S.getLangOpts().CPlusPlus11) { | |||
13324 | LookupResult::Filter F = OpLookup.makeFilter(); | |||
13325 | while (F.hasNext()) { | |||
13326 | NamedDecl *D = F.next(); | |||
13327 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) | |||
13328 | if (Method->isCopyAssignmentOperator() || | |||
13329 | (!Copying && Method->isMoveAssignmentOperator())) | |||
13330 | continue; | |||
13331 | ||||
13332 | F.erase(); | |||
13333 | } | |||
13334 | F.done(); | |||
13335 | } | |||
13336 | ||||
13337 | // Suppress the protected check (C++ [class.protected]) for each of the | |||
13338 | // assignment operators we found. This strange dance is required when | |||
13339 | // we're assigning via a base classes's copy-assignment operator. To | |||
13340 | // ensure that we're getting the right base class subobject (without | |||
13341 | // ambiguities), we need to cast "this" to that subobject type; to | |||
13342 | // ensure that we don't go through the virtual call mechanism, we need | |||
13343 | // to qualify the operator= name with the base class (see below). However, | |||
13344 | // this means that if the base class has a protected copy assignment | |||
13345 | // operator, the protected member access check will fail. So, we | |||
13346 | // rewrite "protected" access to "public" access in this case, since we | |||
13347 | // know by construction that we're calling from a derived class. | |||
13348 | if (CopyingBaseSubobject) { | |||
13349 | for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); | |||
13350 | L != LEnd; ++L) { | |||
13351 | if (L.getAccess() == AS_protected) | |||
13352 | L.setAccess(AS_public); | |||
13353 | } | |||
13354 | } | |||
13355 | ||||
13356 | // Create the nested-name-specifier that will be used to qualify the | |||
13357 | // reference to operator=; this is required to suppress the virtual | |||
13358 | // call mechanism. | |||
13359 | CXXScopeSpec SS; | |||
13360 | const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); | |||
13361 | SS.MakeTrivial(S.Context, | |||
13362 | NestedNameSpecifier::Create(S.Context, nullptr, false, | |||
13363 | CanonicalT), | |||
13364 | Loc); | |||
13365 | ||||
13366 | // Create the reference to operator=. | |||
13367 | ExprResult OpEqualRef | |||
13368 | = S.BuildMemberReferenceExpr(To.build(S, Loc), T, Loc, /*IsArrow=*/false, | |||
13369 | SS, /*TemplateKWLoc=*/SourceLocation(), | |||
13370 | /*FirstQualifierInScope=*/nullptr, | |||
13371 | OpLookup, | |||
13372 | /*TemplateArgs=*/nullptr, /*S*/nullptr, | |||
13373 | /*SuppressQualifierCheck=*/true); | |||
13374 | if (OpEqualRef.isInvalid()) | |||
13375 | return StmtError(); | |||
13376 | ||||
13377 | // Build the call to the assignment operator. | |||
13378 | ||||
13379 | Expr *FromInst = From.build(S, Loc); | |||
13380 | ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/nullptr, | |||
13381 | OpEqualRef.getAs<Expr>(), | |||
13382 | Loc, FromInst, Loc); | |||
13383 | if (Call.isInvalid()) | |||
13384 | return StmtError(); | |||
13385 | ||||
13386 | // If we built a call to a trivial 'operator=' while copying an array, | |||
13387 | // bail out. We'll replace the whole shebang with a memcpy. | |||
13388 | CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get()); | |||
13389 | if (CE && CE->getMethodDecl()->isTrivial() && Depth) | |||
13390 | return StmtResult((Stmt*)nullptr); | |||
13391 | ||||
13392 | // Convert to an expression-statement, and clean up any produced | |||
13393 | // temporaries. | |||
13394 | return S.ActOnExprStmt(Call); | |||
13395 | } | |||
13396 | ||||
13397 | // - if the subobject is of scalar type, the built-in assignment | |||
13398 | // operator is used. | |||
13399 | const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); | |||
13400 | if (!ArrayTy) { | |||
13401 | ExprResult Assignment = S.CreateBuiltinBinOp( | |||
13402 | Loc, BO_Assign, To.build(S, Loc), From.build(S, Loc)); | |||
13403 | if (Assignment.isInvalid()) | |||
13404 | return StmtError(); | |||
13405 | return S.ActOnExprStmt(Assignment); | |||
13406 | } | |||
13407 | ||||
13408 | // - if the subobject is an array, each element is assigned, in the | |||
13409 | // manner appropriate to the element type; | |||
13410 | ||||
13411 | // Construct a loop over the array bounds, e.g., | |||
13412 | // | |||
13413 | // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) | |||
13414 | // | |||
13415 | // that will copy each of the array elements. | |||
13416 | QualType SizeType = S.Context.getSizeType(); | |||
13417 | ||||
13418 | // Create the iteration variable. | |||
13419 | IdentifierInfo *IterationVarName = nullptr; | |||
13420 | { | |||
13421 | SmallString<8> Str; | |||
13422 | llvm::raw_svector_ostream OS(Str); | |||
13423 | OS << "__i" << Depth; | |||
13424 | IterationVarName = &S.Context.Idents.get(OS.str()); | |||
13425 | } | |||
13426 | VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, | |||
13427 | IterationVarName, SizeType, | |||
13428 | S.Context.getTrivialTypeSourceInfo(SizeType, Loc), | |||
13429 | SC_None); | |||
13430 | ||||
13431 | // Initialize the iteration variable to zero. | |||
13432 | llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); | |||
13433 | IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); | |||
13434 | ||||
13435 | // Creates a reference to the iteration variable. | |||
13436 | RefBuilder IterationVarRef(IterationVar, SizeType); | |||
13437 | LvalueConvBuilder IterationVarRefRVal(IterationVarRef); | |||
13438 | ||||
13439 | // Create the DeclStmt that holds the iteration variable. | |||
13440 | Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); | |||
13441 | ||||
13442 | // Subscript the "from" and "to" expressions with the iteration variable. | |||
13443 | SubscriptBuilder FromIndexCopy(From, IterationVarRefRVal); | |||
13444 | MoveCastBuilder FromIndexMove(FromIndexCopy); | |||
13445 | const ExprBuilder *FromIndex; | |||
13446 | if (Copying) | |||
13447 | FromIndex = &FromIndexCopy; | |||
13448 | else | |||
13449 | FromIndex = &FromIndexMove; | |||
13450 | ||||
13451 | SubscriptBuilder ToIndex(To, IterationVarRefRVal); | |||
13452 | ||||
13453 | // Build the copy/move for an individual element of the array. | |||
13454 | StmtResult Copy = | |||
13455 | buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(), | |||
13456 | ToIndex, *FromIndex, CopyingBaseSubobject, | |||
13457 | Copying, Depth + 1); | |||
13458 | // Bail out if copying fails or if we determined that we should use memcpy. | |||
13459 | if (Copy.isInvalid() || !Copy.get()) | |||
13460 | return Copy; | |||
13461 | ||||
13462 | // Create the comparison against the array bound. | |||
13463 | llvm::APInt Upper | |||
13464 | = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); | |||
13465 | Expr *Comparison | |||
13466 | = new (S.Context) BinaryOperator(IterationVarRefRVal.build(S, Loc), | |||
13467 | IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), | |||
13468 | BO_NE, S.Context.BoolTy, | |||
13469 | VK_RValue, OK_Ordinary, Loc, FPOptions()); | |||
13470 | ||||
13471 | // Create the pre-increment of the iteration variable. We can determine | |||
13472 | // whether the increment will overflow based on the value of the array | |||
13473 | // bound. | |||
13474 | Expr *Increment = new (S.Context) | |||
13475 | UnaryOperator(IterationVarRef.build(S, Loc), UO_PreInc, SizeType, | |||
13476 | VK_LValue, OK_Ordinary, Loc, Upper.isMaxValue()); | |||
13477 | ||||
13478 | // Construct the loop that copies all elements of this array. | |||
13479 | return S.ActOnForStmt( | |||
13480 | Loc, Loc, InitStmt, | |||
13481 | S.ActOnCondition(nullptr, Loc, Comparison, Sema::ConditionKind::Boolean), | |||
13482 | S.MakeFullDiscardedValueExpr(Increment), Loc, Copy.get()); | |||
13483 | } | |||
13484 | ||||
13485 | static StmtResult | |||
13486 | buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, | |||
13487 | const ExprBuilder &To, const ExprBuilder &From, | |||
13488 | bool CopyingBaseSubobject, bool Copying) { | |||
13489 | // Maybe we should use a memcpy? | |||
13490 | if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() && | |||
13491 | T.isTriviallyCopyableType(S.Context)) | |||
13492 | return buildMemcpyForAssignmentOp(S, Loc, T, To, From); | |||
13493 | ||||
13494 | StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From, | |||
13495 | CopyingBaseSubobject, | |||
13496 | Copying, 0)); | |||
13497 | ||||
13498 | // If we ended up picking a trivial assignment operator for an array of a | |||
13499 | // non-trivially-copyable class type, just emit a memcpy. | |||
13500 | if (!Result.isInvalid() && !Result.get()) | |||
13501 | return buildMemcpyForAssignmentOp(S, Loc, T, To, From); | |||
13502 | ||||
13503 | return Result; | |||
13504 | } | |||
13505 | ||||
13506 | CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { | |||
13507 | // Note: The following rules are largely analoguous to the copy | |||
13508 | // constructor rules. Note that virtual bases are not taken into account | |||
13509 | // for determining the argument type of the operator. Note also that | |||
13510 | // operators taking an object instead of a reference are allowed. | |||
13511 | assert(ClassDecl->needsImplicitCopyAssignment())((ClassDecl->needsImplicitCopyAssignment()) ? static_cast< void> (0) : __assert_fail ("ClassDecl->needsImplicitCopyAssignment()" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 13511, __PRETTY_FUNCTION__)); | |||
13512 | ||||
13513 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment); | |||
13514 | if (DSM.isAlreadyBeingDeclared()) | |||
13515 | return nullptr; | |||
13516 | ||||
13517 | QualType ArgType = Context.getTypeDeclType(ClassDecl); | |||
13518 | LangAS AS = getDefaultCXXMethodAddrSpace(); | |||
13519 | if (AS != LangAS::Default) | |||
13520 | ArgType = Context.getAddrSpaceQualType(ArgType, AS); | |||
13521 | QualType RetType = Context.getLValueReferenceType(ArgType); | |||
13522 | bool Const = ClassDecl->implicitCopyAssignmentHasConstParam(); | |||
13523 | if (Const) | |||
13524 | ArgType = ArgType.withConst(); | |||
13525 | ||||
13526 | ArgType = Context.getLValueReferenceType(ArgType); | |||
13527 | ||||
13528 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, | |||
13529 | CXXCopyAssignment, | |||
13530 | Const); | |||
13531 | ||||
13532 | // An implicitly-declared copy assignment operator is an inline public | |||
13533 | // member of its class. | |||
13534 | DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); | |||
13535 | SourceLocation ClassLoc = ClassDecl->getLocation(); | |||
13536 | DeclarationNameInfo NameInfo(Name, ClassLoc); | |||
13537 | CXXMethodDecl *CopyAssignment = CXXMethodDecl::Create( | |||
13538 | Context, ClassDecl, ClassLoc, NameInfo, QualType(), | |||
13539 | /*TInfo=*/nullptr, /*StorageClass=*/SC_None, | |||
13540 | /*isInline=*/true, Constexpr ? CSK_constexpr : CSK_unspecified, | |||
13541 | SourceLocation()); | |||
13542 | CopyAssignment->setAccess(AS_public); | |||
13543 | CopyAssignment->setDefaulted(); | |||
13544 | CopyAssignment->setImplicit(); | |||
13545 | ||||
13546 | if (getLangOpts().CUDA) { | |||
13547 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXCopyAssignment, | |||
13548 | CopyAssignment, | |||
13549 | /* ConstRHS */ Const, | |||
13550 | /* Diagnose */ false); | |||
13551 | } | |||
13552 | ||||
13553 | setupImplicitSpecialMemberType(CopyAssignment, RetType, ArgType); | |||
13554 | ||||
13555 | // Add the parameter to the operator. | |||
13556 | ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, | |||
13557 | ClassLoc, ClassLoc, | |||
13558 | /*Id=*/nullptr, ArgType, | |||
13559 | /*TInfo=*/nullptr, SC_None, | |||
13560 | nullptr); | |||
13561 | CopyAssignment->setParams(FromParam); | |||
13562 | ||||
13563 | CopyAssignment->setTrivial( | |||
13564 | ClassDecl->needsOverloadResolutionForCopyAssignment() | |||
13565 | ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment) | |||
13566 | : ClassDecl->hasTrivialCopyAssignment()); | |||
13567 | ||||
13568 | // Note that we have added this copy-assignment operator. | |||
13569 | ++getASTContext().NumImplicitCopyAssignmentOperatorsDeclared; | |||
13570 | ||||
13571 | Scope *S = getScopeForContext(ClassDecl); | |||
13572 | CheckImplicitSpecialMemberDeclaration(S, CopyAssignment); | |||
13573 | ||||
13574 | if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) | |||
13575 | SetDeclDeleted(CopyAssignment, ClassLoc); | |||
13576 | ||||
13577 | if (S) | |||
13578 | PushOnScopeChains(CopyAssignment, S, false); | |||
13579 | ClassDecl->addDecl(CopyAssignment); | |||
13580 | ||||
13581 | return CopyAssignment; | |||
13582 | } | |||
13583 | ||||
13584 | /// Diagnose an implicit copy operation for a class which is odr-used, but | |||
13585 | /// which is deprecated because the class has a user-declared copy constructor, | |||
13586 | /// copy assignment operator, or destructor. | |||
13587 | static void diagnoseDeprecatedCopyOperation(Sema &S, CXXMethodDecl *CopyOp) { | |||
13588 | assert(CopyOp->isImplicit())((CopyOp->isImplicit()) ? static_cast<void> (0) : __assert_fail ("CopyOp->isImplicit()", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 13588, __PRETTY_FUNCTION__)); | |||
13589 | ||||
13590 | CXXRecordDecl *RD = CopyOp->getParent(); | |||
13591 | CXXMethodDecl *UserDeclaredOperation = nullptr; | |||
13592 | ||||
13593 | // In Microsoft mode, assignment operations don't affect constructors and | |||
13594 | // vice versa. | |||
13595 | if (RD->hasUserDeclaredDestructor()) { | |||
13596 | UserDeclaredOperation = RD->getDestructor(); | |||
13597 | } else if (!isa<CXXConstructorDecl>(CopyOp) && | |||
13598 | RD->hasUserDeclaredCopyConstructor() && | |||
13599 | !S.getLangOpts().MSVCCompat) { | |||
13600 | // Find any user-declared copy constructor. | |||
13601 | for (auto *I : RD->ctors()) { | |||
13602 | if (I->isCopyConstructor()) { | |||
13603 | UserDeclaredOperation = I; | |||
13604 | break; | |||
13605 | } | |||
13606 | } | |||
13607 | assert(UserDeclaredOperation)((UserDeclaredOperation) ? static_cast<void> (0) : __assert_fail ("UserDeclaredOperation", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 13607, __PRETTY_FUNCTION__)); | |||
13608 | } else if (isa<CXXConstructorDecl>(CopyOp) && | |||
13609 | RD->hasUserDeclaredCopyAssignment() && | |||
13610 | !S.getLangOpts().MSVCCompat) { | |||
13611 | // Find any user-declared move assignment operator. | |||
13612 | for (auto *I : RD->methods()) { | |||
13613 | if (I->isCopyAssignmentOperator()) { | |||
13614 | UserDeclaredOperation = I; | |||
13615 | break; | |||
13616 | } | |||
13617 | } | |||
13618 | assert(UserDeclaredOperation)((UserDeclaredOperation) ? static_cast<void> (0) : __assert_fail ("UserDeclaredOperation", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 13618, __PRETTY_FUNCTION__)); | |||
13619 | } | |||
13620 | ||||
13621 | if (UserDeclaredOperation && UserDeclaredOperation->isUserProvided()) { | |||
13622 | S.Diag(UserDeclaredOperation->getLocation(), | |||
13623 | isa<CXXDestructorDecl>(UserDeclaredOperation) | |||
13624 | ? diag::warn_deprecated_copy_dtor_operation | |||
13625 | : diag::warn_deprecated_copy_operation) | |||
13626 | << RD << /*copy assignment*/ !isa<CXXConstructorDecl>(CopyOp); | |||
13627 | } | |||
13628 | } | |||
13629 | ||||
13630 | void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, | |||
13631 | CXXMethodDecl *CopyAssignOperator) { | |||
13632 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 13637, __PRETTY_FUNCTION__)) | |||
13633 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 13637, __PRETTY_FUNCTION__)) | |||
13634 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 13637, __PRETTY_FUNCTION__)) | |||
13635 | !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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 13637, __PRETTY_FUNCTION__)) | |||
13636 | !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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 13637, __PRETTY_FUNCTION__)) | |||
13637 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 13637, __PRETTY_FUNCTION__)); | |||
13638 | if (CopyAssignOperator->willHaveBody() || CopyAssignOperator->isInvalidDecl()) | |||
13639 | return; | |||
13640 | ||||
13641 | CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); | |||
13642 | if (ClassDecl->isInvalidDecl()) { | |||
13643 | CopyAssignOperator->setInvalidDecl(); | |||
13644 | return; | |||
13645 | } | |||
13646 | ||||
13647 | SynthesizedFunctionScope Scope(*this, CopyAssignOperator); | |||
13648 | ||||
13649 | // The exception specification is needed because we are defining the | |||
13650 | // function. | |||
13651 | ResolveExceptionSpec(CurrentLocation, | |||
13652 | CopyAssignOperator->getType()->castAs<FunctionProtoType>()); | |||
13653 | ||||
13654 | // Add a context note for diagnostics produced after this point. | |||
13655 | Scope.addContextNote(CurrentLocation); | |||
13656 | ||||
13657 | // C++11 [class.copy]p18: | |||
13658 | // The [definition of an implicitly declared copy assignment operator] is | |||
13659 | // deprecated if the class has a user-declared copy constructor or a | |||
13660 | // user-declared destructor. | |||
13661 | if (getLangOpts().CPlusPlus11 && CopyAssignOperator->isImplicit()) | |||
13662 | diagnoseDeprecatedCopyOperation(*this, CopyAssignOperator); | |||
13663 | ||||
13664 | // C++0x [class.copy]p30: | |||
13665 | // The implicitly-defined or explicitly-defaulted copy assignment operator | |||
13666 | // for a non-union class X performs memberwise copy assignment of its | |||
13667 | // subobjects. The direct base classes of X are assigned first, in the | |||
13668 | // order of their declaration in the base-specifier-list, and then the | |||
13669 | // immediate non-static data members of X are assigned, in the order in | |||
13670 | // which they were declared in the class definition. | |||
13671 | ||||
13672 | // The statements that form the synthesized function body. | |||
13673 | SmallVector<Stmt*, 8> Statements; | |||
13674 | ||||
13675 | // The parameter for the "other" object, which we are copying from. | |||
13676 | ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); | |||
13677 | Qualifiers OtherQuals = Other->getType().getQualifiers(); | |||
13678 | QualType OtherRefType = Other->getType(); | |||
13679 | if (const LValueReferenceType *OtherRef | |||
13680 | = OtherRefType->getAs<LValueReferenceType>()) { | |||
13681 | OtherRefType = OtherRef->getPointeeType(); | |||
13682 | OtherQuals = OtherRefType.getQualifiers(); | |||
13683 | } | |||
13684 | ||||
13685 | // Our location for everything implicitly-generated. | |||
13686 | SourceLocation Loc = CopyAssignOperator->getEndLoc().isValid() | |||
13687 | ? CopyAssignOperator->getEndLoc() | |||
13688 | : CopyAssignOperator->getLocation(); | |||
13689 | ||||
13690 | // Builds a DeclRefExpr for the "other" object. | |||
13691 | RefBuilder OtherRef(Other, OtherRefType); | |||
13692 | ||||
13693 | // Builds the "this" pointer. | |||
13694 | ThisBuilder This; | |||
13695 | ||||
13696 | // Assign base classes. | |||
13697 | bool Invalid = false; | |||
13698 | for (auto &Base : ClassDecl->bases()) { | |||
13699 | // Form the assignment: | |||
13700 | // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); | |||
13701 | QualType BaseType = Base.getType().getUnqualifiedType(); | |||
13702 | if (!BaseType->isRecordType()) { | |||
13703 | Invalid = true; | |||
13704 | continue; | |||
13705 | } | |||
13706 | ||||
13707 | CXXCastPath BasePath; | |||
13708 | BasePath.push_back(&Base); | |||
13709 | ||||
13710 | // Construct the "from" expression, which is an implicit cast to the | |||
13711 | // appropriately-qualified base type. | |||
13712 | CastBuilder From(OtherRef, Context.getQualifiedType(BaseType, OtherQuals), | |||
13713 | VK_LValue, BasePath); | |||
13714 | ||||
13715 | // Dereference "this". | |||
13716 | DerefBuilder DerefThis(This); | |||
13717 | CastBuilder To(DerefThis, | |||
13718 | Context.getQualifiedType( | |||
13719 | BaseType, CopyAssignOperator->getMethodQualifiers()), | |||
13720 | VK_LValue, BasePath); | |||
13721 | ||||
13722 | // Build the copy. | |||
13723 | StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType, | |||
13724 | To, From, | |||
13725 | /*CopyingBaseSubobject=*/true, | |||
13726 | /*Copying=*/true); | |||
13727 | if (Copy.isInvalid()) { | |||
13728 | CopyAssignOperator->setInvalidDecl(); | |||
13729 | return; | |||
13730 | } | |||
13731 | ||||
13732 | // Success! Record the copy. | |||
13733 | Statements.push_back(Copy.getAs<Expr>()); | |||
13734 | } | |||
13735 | ||||
13736 | // Assign non-static members. | |||
13737 | for (auto *Field : ClassDecl->fields()) { | |||
13738 | // FIXME: We should form some kind of AST representation for the implied | |||
13739 | // memcpy in a union copy operation. | |||
13740 | if (Field->isUnnamedBitfield() || Field->getParent()->isUnion()) | |||
13741 | continue; | |||
13742 | ||||
13743 | if (Field->isInvalidDecl()) { | |||
13744 | Invalid = true; | |||
13745 | continue; | |||
13746 | } | |||
13747 | ||||
13748 | // Check for members of reference type; we can't copy those. | |||
13749 | if (Field->getType()->isReferenceType()) { | |||
13750 | Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) | |||
13751 | << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); | |||
13752 | Diag(Field->getLocation(), diag::note_declared_at); | |||
13753 | Invalid = true; | |||
13754 | continue; | |||
13755 | } | |||
13756 | ||||
13757 | // Check for members of const-qualified, non-class type. | |||
13758 | QualType BaseType = Context.getBaseElementType(Field->getType()); | |||
13759 | if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { | |||
13760 | Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) | |||
13761 | << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); | |||
13762 | Diag(Field->getLocation(), diag::note_declared_at); | |||
13763 | Invalid = true; | |||
13764 | continue; | |||
13765 | } | |||
13766 | ||||
13767 | // Suppress assigning zero-width bitfields. | |||
13768 | if (Field->isZeroLengthBitField(Context)) | |||
13769 | continue; | |||
13770 | ||||
13771 | QualType FieldType = Field->getType().getNonReferenceType(); | |||
13772 | if (FieldType->isIncompleteArrayType()) { | |||
13773 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 13774, __PRETTY_FUNCTION__)) | |||
13774 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 13774, __PRETTY_FUNCTION__)); | |||
13775 | continue; | |||
13776 | } | |||
13777 | ||||
13778 | // Build references to the field in the object we're copying from and to. | |||
13779 | CXXScopeSpec SS; // Intentionally empty | |||
13780 | LookupResult MemberLookup(*this, Field->getDeclName(), Loc, | |||
13781 | LookupMemberName); | |||
13782 | MemberLookup.addDecl(Field); | |||
13783 | MemberLookup.resolveKind(); | |||
13784 | ||||
13785 | MemberBuilder From(OtherRef, OtherRefType, /*IsArrow=*/false, MemberLookup); | |||
13786 | ||||
13787 | MemberBuilder To(This, getCurrentThisType(), /*IsArrow=*/true, MemberLookup); | |||
13788 | ||||
13789 | // Build the copy of this field. | |||
13790 | StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType, | |||
13791 | To, From, | |||
13792 | /*CopyingBaseSubobject=*/false, | |||
13793 | /*Copying=*/true); | |||
13794 | if (Copy.isInvalid()) { | |||
13795 | CopyAssignOperator->setInvalidDecl(); | |||
13796 | return; | |||
13797 | } | |||
13798 | ||||
13799 | // Success! Record the copy. | |||
13800 | Statements.push_back(Copy.getAs<Stmt>()); | |||
13801 | } | |||
13802 | ||||
13803 | if (!Invalid) { | |||
13804 | // Add a "return *this;" | |||
13805 | ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc)); | |||
13806 | ||||
13807 | StmtResult Return = BuildReturnStmt(Loc, ThisObj.get()); | |||
13808 | if (Return.isInvalid()) | |||
13809 | Invalid = true; | |||
13810 | else | |||
13811 | Statements.push_back(Return.getAs<Stmt>()); | |||
13812 | } | |||
13813 | ||||
13814 | if (Invalid) { | |||
13815 | CopyAssignOperator->setInvalidDecl(); | |||
13816 | return; | |||
13817 | } | |||
13818 | ||||
13819 | StmtResult Body; | |||
13820 | { | |||
13821 | CompoundScopeRAII CompoundScope(*this); | |||
13822 | Body = ActOnCompoundStmt(Loc, Loc, Statements, | |||
13823 | /*isStmtExpr=*/false); | |||
13824 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 13824, __PRETTY_FUNCTION__)); | |||
13825 | } | |||
13826 | CopyAssignOperator->setBody(Body.getAs<Stmt>()); | |||
13827 | CopyAssignOperator->markUsed(Context); | |||
13828 | ||||
13829 | if (ASTMutationListener *L = getASTMutationListener()) { | |||
13830 | L->CompletedImplicitDefinition(CopyAssignOperator); | |||
13831 | } | |||
13832 | } | |||
13833 | ||||
13834 | CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { | |||
13835 | assert(ClassDecl->needsImplicitMoveAssignment())((ClassDecl->needsImplicitMoveAssignment()) ? static_cast< void> (0) : __assert_fail ("ClassDecl->needsImplicitMoveAssignment()" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 13835, __PRETTY_FUNCTION__)); | |||
13836 | ||||
13837 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment); | |||
13838 | if (DSM.isAlreadyBeingDeclared()) | |||
13839 | return nullptr; | |||
13840 | ||||
13841 | // Note: The following rules are largely analoguous to the move | |||
13842 | // constructor rules. | |||
13843 | ||||
13844 | QualType ArgType = Context.getTypeDeclType(ClassDecl); | |||
13845 | LangAS AS = getDefaultCXXMethodAddrSpace(); | |||
13846 | if (AS != LangAS::Default) | |||
13847 | ArgType = Context.getAddrSpaceQualType(ArgType, AS); | |||
13848 | QualType RetType = Context.getLValueReferenceType(ArgType); | |||
13849 | ArgType = Context.getRValueReferenceType(ArgType); | |||
13850 | ||||
13851 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, | |||
13852 | CXXMoveAssignment, | |||
13853 | false); | |||
13854 | ||||
13855 | // An implicitly-declared move assignment operator is an inline public | |||
13856 | // member of its class. | |||
13857 | DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); | |||
13858 | SourceLocation ClassLoc = ClassDecl->getLocation(); | |||
13859 | DeclarationNameInfo NameInfo(Name, ClassLoc); | |||
13860 | CXXMethodDecl *MoveAssignment = CXXMethodDecl::Create( | |||
13861 | Context, ClassDecl, ClassLoc, NameInfo, QualType(), | |||
13862 | /*TInfo=*/nullptr, /*StorageClass=*/SC_None, | |||
13863 | /*isInline=*/true, Constexpr ? CSK_constexpr : CSK_unspecified, | |||
13864 | SourceLocation()); | |||
13865 | MoveAssignment->setAccess(AS_public); | |||
13866 | MoveAssignment->setDefaulted(); | |||
13867 | MoveAssignment->setImplicit(); | |||
13868 | ||||
13869 | if (getLangOpts().CUDA) { | |||
13870 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXMoveAssignment, | |||
13871 | MoveAssignment, | |||
13872 | /* ConstRHS */ false, | |||
13873 | /* Diagnose */ false); | |||
13874 | } | |||
13875 | ||||
13876 | // Build an exception specification pointing back at this member. | |||
13877 | FunctionProtoType::ExtProtoInfo EPI = | |||
13878 | getImplicitMethodEPI(*this, MoveAssignment); | |||
13879 | MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); | |||
13880 | ||||
13881 | // Add the parameter to the operator. | |||
13882 | ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, | |||
13883 | ClassLoc, ClassLoc, | |||
13884 | /*Id=*/nullptr, ArgType, | |||
13885 | /*TInfo=*/nullptr, SC_None, | |||
13886 | nullptr); | |||
13887 | MoveAssignment->setParams(FromParam); | |||
13888 | ||||
13889 | MoveAssignment->setTrivial( | |||
13890 | ClassDecl->needsOverloadResolutionForMoveAssignment() | |||
13891 | ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment) | |||
13892 | : ClassDecl->hasTrivialMoveAssignment()); | |||
13893 | ||||
13894 | // Note that we have added this copy-assignment operator. | |||
13895 | ++getASTContext().NumImplicitMoveAssignmentOperatorsDeclared; | |||
13896 | ||||
13897 | Scope *S = getScopeForContext(ClassDecl); | |||
13898 | CheckImplicitSpecialMemberDeclaration(S, MoveAssignment); | |||
13899 | ||||
13900 | if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { | |||
13901 | ClassDecl->setImplicitMoveAssignmentIsDeleted(); | |||
13902 | SetDeclDeleted(MoveAssignment, ClassLoc); | |||
13903 | } | |||
13904 | ||||
13905 | if (S) | |||
13906 | PushOnScopeChains(MoveAssignment, S, false); | |||
13907 | ClassDecl->addDecl(MoveAssignment); | |||
13908 | ||||
13909 | return MoveAssignment; | |||
13910 | } | |||
13911 | ||||
13912 | /// Check if we're implicitly defining a move assignment operator for a class | |||
13913 | /// with virtual bases. Such a move assignment might move-assign the virtual | |||
13914 | /// base multiple times. | |||
13915 | static void checkMoveAssignmentForRepeatedMove(Sema &S, CXXRecordDecl *Class, | |||
13916 | SourceLocation CurrentLocation) { | |||
13917 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 13917, __PRETTY_FUNCTION__)); | |||
13918 | ||||
13919 | // Only a virtual base could get implicitly move-assigned multiple times. | |||
13920 | // Only a non-trivial move assignment can observe this. We only want to | |||
13921 | // diagnose if we implicitly define an assignment operator that assigns | |||
13922 | // two base classes, both of which move-assign the same virtual base. | |||
13923 | if (Class->getNumVBases() == 0 || Class->hasTrivialMoveAssignment() || | |||
13924 | Class->getNumBases() < 2) | |||
13925 | return; | |||
13926 | ||||
13927 | llvm::SmallVector<CXXBaseSpecifier *, 16> Worklist; | |||
13928 | typedef llvm::DenseMap<CXXRecordDecl*, CXXBaseSpecifier*> VBaseMap; | |||
13929 | VBaseMap VBases; | |||
13930 | ||||
13931 | for (auto &BI : Class->bases()) { | |||
13932 | Worklist.push_back(&BI); | |||
13933 | while (!Worklist.empty()) { | |||
13934 | CXXBaseSpecifier *BaseSpec = Worklist.pop_back_val(); | |||
13935 | CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl(); | |||
13936 | ||||
13937 | // If the base has no non-trivial move assignment operators, | |||
13938 | // we don't care about moves from it. | |||
13939 | if (!Base->hasNonTrivialMoveAssignment()) | |||
13940 | continue; | |||
13941 | ||||
13942 | // If there's nothing virtual here, skip it. | |||
13943 | if (!BaseSpec->isVirtual() && !Base->getNumVBases()) | |||
13944 | continue; | |||
13945 | ||||
13946 | // If we're not actually going to call a move assignment for this base, | |||
13947 | // or the selected move assignment is trivial, skip it. | |||
13948 | Sema::SpecialMemberOverloadResult SMOR = | |||
13949 | S.LookupSpecialMember(Base, Sema::CXXMoveAssignment, | |||
13950 | /*ConstArg*/false, /*VolatileArg*/false, | |||
13951 | /*RValueThis*/true, /*ConstThis*/false, | |||
13952 | /*VolatileThis*/false); | |||
13953 | if (!SMOR.getMethod() || SMOR.getMethod()->isTrivial() || | |||
13954 | !SMOR.getMethod()->isMoveAssignmentOperator()) | |||
13955 | continue; | |||
13956 | ||||
13957 | if (BaseSpec->isVirtual()) { | |||
13958 | // We're going to move-assign this virtual base, and its move | |||
13959 | // assignment operator is not trivial. If this can happen for | |||
13960 | // multiple distinct direct bases of Class, diagnose it. (If it | |||
13961 | // only happens in one base, we'll diagnose it when synthesizing | |||
13962 | // that base class's move assignment operator.) | |||
13963 | CXXBaseSpecifier *&Existing = | |||
13964 | VBases.insert(std::make_pair(Base->getCanonicalDecl(), &BI)) | |||
13965 | .first->second; | |||
13966 | if (Existing && Existing != &BI) { | |||
13967 | S.Diag(CurrentLocation, diag::warn_vbase_moved_multiple_times) | |||
13968 | << Class << Base; | |||
13969 | S.Diag(Existing->getBeginLoc(), diag::note_vbase_moved_here) | |||
13970 | << (Base->getCanonicalDecl() == | |||
13971 | Existing->getType()->getAsCXXRecordDecl()->getCanonicalDecl()) | |||
13972 | << Base << Existing->getType() << Existing->getSourceRange(); | |||
13973 | S.Diag(BI.getBeginLoc(), diag::note_vbase_moved_here) | |||
13974 | << (Base->getCanonicalDecl() == | |||
13975 | BI.getType()->getAsCXXRecordDecl()->getCanonicalDecl()) | |||
13976 | << Base << BI.getType() << BaseSpec->getSourceRange(); | |||
13977 | ||||
13978 | // Only diagnose each vbase once. | |||
13979 | Existing = nullptr; | |||
13980 | } | |||
13981 | } else { | |||
13982 | // Only walk over bases that have defaulted move assignment operators. | |||
13983 | // We assume that any user-provided move assignment operator handles | |||
13984 | // the multiple-moves-of-vbase case itself somehow. | |||
13985 | if (!SMOR.getMethod()->isDefaulted()) | |||
13986 | continue; | |||
13987 | ||||
13988 | // We're going to move the base classes of Base. Add them to the list. | |||
13989 | for (auto &BI : Base->bases()) | |||
13990 | Worklist.push_back(&BI); | |||
13991 | } | |||
13992 | } | |||
13993 | } | |||
13994 | } | |||
13995 | ||||
13996 | void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, | |||
13997 | CXXMethodDecl *MoveAssignOperator) { | |||
13998 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14003, __PRETTY_FUNCTION__)) | |||
13999 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14003, __PRETTY_FUNCTION__)) | |||
14000 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14003, __PRETTY_FUNCTION__)) | |||
14001 | !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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14003, __PRETTY_FUNCTION__)) | |||
14002 | !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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14003, __PRETTY_FUNCTION__)) | |||
14003 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14003, __PRETTY_FUNCTION__)); | |||
14004 | if (MoveAssignOperator->willHaveBody() || MoveAssignOperator->isInvalidDecl()) | |||
14005 | return; | |||
14006 | ||||
14007 | CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); | |||
14008 | if (ClassDecl->isInvalidDecl()) { | |||
14009 | MoveAssignOperator->setInvalidDecl(); | |||
14010 | return; | |||
14011 | } | |||
14012 | ||||
14013 | // C++0x [class.copy]p28: | |||
14014 | // The implicitly-defined or move assignment operator for a non-union class | |||
14015 | // X performs memberwise move assignment of its subobjects. The direct base | |||
14016 | // classes of X are assigned first, in the order of their declaration in the | |||
14017 | // base-specifier-list, and then the immediate non-static data members of X | |||
14018 | // are assigned, in the order in which they were declared in the class | |||
14019 | // definition. | |||
14020 | ||||
14021 | // Issue a warning if our implicit move assignment operator will move | |||
14022 | // from a virtual base more than once. | |||
14023 | checkMoveAssignmentForRepeatedMove(*this, ClassDecl, CurrentLocation); | |||
14024 | ||||
14025 | SynthesizedFunctionScope Scope(*this, MoveAssignOperator); | |||
14026 | ||||
14027 | // The exception specification is needed because we are defining the | |||
14028 | // function. | |||
14029 | ResolveExceptionSpec(CurrentLocation, | |||
14030 | MoveAssignOperator->getType()->castAs<FunctionProtoType>()); | |||
14031 | ||||
14032 | // Add a context note for diagnostics produced after this point. | |||
14033 | Scope.addContextNote(CurrentLocation); | |||
14034 | ||||
14035 | // The statements that form the synthesized function body. | |||
14036 | SmallVector<Stmt*, 8> Statements; | |||
14037 | ||||
14038 | // The parameter for the "other" object, which we are move from. | |||
14039 | ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); | |||
14040 | QualType OtherRefType = | |||
14041 | Other->getType()->castAs<RValueReferenceType>()->getPointeeType(); | |||
14042 | ||||
14043 | // Our location for everything implicitly-generated. | |||
14044 | SourceLocation Loc = MoveAssignOperator->getEndLoc().isValid() | |||
14045 | ? MoveAssignOperator->getEndLoc() | |||
14046 | : MoveAssignOperator->getLocation(); | |||
14047 | ||||
14048 | // Builds a reference to the "other" object. | |||
14049 | RefBuilder OtherRef(Other, OtherRefType); | |||
14050 | // Cast to rvalue. | |||
14051 | MoveCastBuilder MoveOther(OtherRef); | |||
14052 | ||||
14053 | // Builds the "this" pointer. | |||
14054 | ThisBuilder This; | |||
14055 | ||||
14056 | // Assign base classes. | |||
14057 | bool Invalid = false; | |||
14058 | for (auto &Base : ClassDecl->bases()) { | |||
14059 | // C++11 [class.copy]p28: | |||
14060 | // It is unspecified whether subobjects representing virtual base classes | |||
14061 | // are assigned more than once by the implicitly-defined copy assignment | |||
14062 | // operator. | |||
14063 | // FIXME: Do not assign to a vbase that will be assigned by some other base | |||
14064 | // class. For a move-assignment, this can result in the vbase being moved | |||
14065 | // multiple times. | |||
14066 | ||||
14067 | // Form the assignment: | |||
14068 | // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); | |||
14069 | QualType BaseType = Base.getType().getUnqualifiedType(); | |||
14070 | if (!BaseType->isRecordType()) { | |||
14071 | Invalid = true; | |||
14072 | continue; | |||
14073 | } | |||
14074 | ||||
14075 | CXXCastPath BasePath; | |||
14076 | BasePath.push_back(&Base); | |||
14077 | ||||
14078 | // Construct the "from" expression, which is an implicit cast to the | |||
14079 | // appropriately-qualified base type. | |||
14080 | CastBuilder From(OtherRef, BaseType, VK_XValue, BasePath); | |||
14081 | ||||
14082 | // Dereference "this". | |||
14083 | DerefBuilder DerefThis(This); | |||
14084 | ||||
14085 | // Implicitly cast "this" to the appropriately-qualified base type. | |||
14086 | CastBuilder To(DerefThis, | |||
14087 | Context.getQualifiedType( | |||
14088 | BaseType, MoveAssignOperator->getMethodQualifiers()), | |||
14089 | VK_LValue, BasePath); | |||
14090 | ||||
14091 | // Build the move. | |||
14092 | StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType, | |||
14093 | To, From, | |||
14094 | /*CopyingBaseSubobject=*/true, | |||
14095 | /*Copying=*/false); | |||
14096 | if (Move.isInvalid()) { | |||
14097 | MoveAssignOperator->setInvalidDecl(); | |||
14098 | return; | |||
14099 | } | |||
14100 | ||||
14101 | // Success! Record the move. | |||
14102 | Statements.push_back(Move.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 move 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-11~++20200309111110+2c36c23f347/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-11~++20200309111110+2c36c23f347/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 | LookupResult MemberLookup(*this, Field->getDeclName(), Loc, | |||
14149 | LookupMemberName); | |||
14150 | MemberLookup.addDecl(Field); | |||
14151 | MemberLookup.resolveKind(); | |||
14152 | MemberBuilder From(MoveOther, OtherRefType, | |||
14153 | /*IsArrow=*/false, MemberLookup); | |||
14154 | MemberBuilder To(This, getCurrentThisType(), | |||
14155 | /*IsArrow=*/true, MemberLookup); | |||
14156 | ||||
14157 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14159, __PRETTY_FUNCTION__)) | |||
14158 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14159, __PRETTY_FUNCTION__)) | |||
14159 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14159, __PRETTY_FUNCTION__)); | |||
14160 | ||||
14161 | // Build the move of this field. | |||
14162 | StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType, | |||
14163 | To, From, | |||
14164 | /*CopyingBaseSubobject=*/false, | |||
14165 | /*Copying=*/false); | |||
14166 | if (Move.isInvalid()) { | |||
14167 | MoveAssignOperator->setInvalidDecl(); | |||
14168 | return; | |||
14169 | } | |||
14170 | ||||
14171 | // Success! Record the copy. | |||
14172 | Statements.push_back(Move.getAs<Stmt>()); | |||
14173 | } | |||
14174 | ||||
14175 | if (!Invalid) { | |||
14176 | // Add a "return *this;" | |||
14177 | ExprResult ThisObj = | |||
14178 | CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc)); | |||
14179 | ||||
14180 | StmtResult Return = BuildReturnStmt(Loc, ThisObj.get()); | |||
14181 | if (Return.isInvalid()) | |||
14182 | Invalid = true; | |||
14183 | else | |||
14184 | Statements.push_back(Return.getAs<Stmt>()); | |||
14185 | } | |||
14186 | ||||
14187 | if (Invalid) { | |||
14188 | MoveAssignOperator->setInvalidDecl(); | |||
14189 | return; | |||
14190 | } | |||
14191 | ||||
14192 | StmtResult Body; | |||
14193 | { | |||
14194 | CompoundScopeRAII CompoundScope(*this); | |||
14195 | Body = ActOnCompoundStmt(Loc, Loc, Statements, | |||
14196 | /*isStmtExpr=*/false); | |||
14197 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14197, __PRETTY_FUNCTION__)); | |||
14198 | } | |||
14199 | MoveAssignOperator->setBody(Body.getAs<Stmt>()); | |||
14200 | MoveAssignOperator->markUsed(Context); | |||
14201 | ||||
14202 | if (ASTMutationListener *L = getASTMutationListener()) { | |||
14203 | L->CompletedImplicitDefinition(MoveAssignOperator); | |||
14204 | } | |||
14205 | } | |||
14206 | ||||
14207 | CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( | |||
14208 | CXXRecordDecl *ClassDecl) { | |||
14209 | // C++ [class.copy]p4: | |||
14210 | // If the class definition does not explicitly declare a copy | |||
14211 | // constructor, one is declared implicitly. | |||
14212 | assert(ClassDecl->needsImplicitCopyConstructor())((ClassDecl->needsImplicitCopyConstructor()) ? static_cast <void> (0) : __assert_fail ("ClassDecl->needsImplicitCopyConstructor()" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14212, __PRETTY_FUNCTION__)); | |||
14213 | ||||
14214 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor); | |||
14215 | if (DSM.isAlreadyBeingDeclared()) | |||
14216 | return nullptr; | |||
14217 | ||||
14218 | QualType ClassType = Context.getTypeDeclType(ClassDecl); | |||
14219 | QualType ArgType = ClassType; | |||
14220 | bool Const = ClassDecl->implicitCopyConstructorHasConstParam(); | |||
14221 | if (Const) | |||
14222 | ArgType = ArgType.withConst(); | |||
14223 | ||||
14224 | LangAS AS = getDefaultCXXMethodAddrSpace(); | |||
14225 | if (AS != LangAS::Default) | |||
14226 | ArgType = Context.getAddrSpaceQualType(ArgType, AS); | |||
14227 | ||||
14228 | ArgType = Context.getLValueReferenceType(ArgType); | |||
14229 | ||||
14230 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, | |||
14231 | CXXCopyConstructor, | |||
14232 | Const); | |||
14233 | ||||
14234 | DeclarationName Name | |||
14235 | = Context.DeclarationNames.getCXXConstructorName( | |||
14236 | Context.getCanonicalType(ClassType)); | |||
14237 | SourceLocation ClassLoc = ClassDecl->getLocation(); | |||
14238 | DeclarationNameInfo NameInfo(Name, ClassLoc); | |||
14239 | ||||
14240 | // An implicitly-declared copy constructor is an inline public | |||
14241 | // member of its class. | |||
14242 | CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( | |||
14243 | Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/nullptr, | |||
14244 | ExplicitSpecifier(), | |||
14245 | /*isInline=*/true, | |||
14246 | /*isImplicitlyDeclared=*/true, | |||
14247 | Constexpr ? CSK_constexpr : CSK_unspecified); | |||
14248 | CopyConstructor->setAccess(AS_public); | |||
14249 | CopyConstructor->setDefaulted(); | |||
14250 | ||||
14251 | if (getLangOpts().CUDA) { | |||
14252 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXCopyConstructor, | |||
14253 | CopyConstructor, | |||
14254 | /* ConstRHS */ Const, | |||
14255 | /* Diagnose */ false); | |||
14256 | } | |||
14257 | ||||
14258 | setupImplicitSpecialMemberType(CopyConstructor, Context.VoidTy, ArgType); | |||
14259 | ||||
14260 | // Add the parameter to the constructor. | |||
14261 | ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, | |||
14262 | ClassLoc, ClassLoc, | |||
14263 | /*IdentifierInfo=*/nullptr, | |||
14264 | ArgType, /*TInfo=*/nullptr, | |||
14265 | SC_None, nullptr); | |||
14266 | CopyConstructor->setParams(FromParam); | |||
14267 | ||||
14268 | CopyConstructor->setTrivial( | |||
14269 | ClassDecl->needsOverloadResolutionForCopyConstructor() | |||
14270 | ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor) | |||
14271 | : ClassDecl->hasTrivialCopyConstructor()); | |||
14272 | ||||
14273 | CopyConstructor->setTrivialForCall( | |||
14274 | ClassDecl->hasAttr<TrivialABIAttr>() || | |||
14275 | (ClassDecl->needsOverloadResolutionForCopyConstructor() | |||
14276 | ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor, | |||
14277 | TAH_ConsiderTrivialABI) | |||
14278 | : ClassDecl->hasTrivialCopyConstructorForCall())); | |||
14279 | ||||
14280 | // Note that we have declared this constructor. | |||
14281 | ++getASTContext().NumImplicitCopyConstructorsDeclared; | |||
14282 | ||||
14283 | Scope *S = getScopeForContext(ClassDecl); | |||
14284 | CheckImplicitSpecialMemberDeclaration(S, CopyConstructor); | |||
14285 | ||||
14286 | if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) { | |||
14287 | ClassDecl->setImplicitCopyConstructorIsDeleted(); | |||
14288 | SetDeclDeleted(CopyConstructor, ClassLoc); | |||
14289 | } | |||
14290 | ||||
14291 | if (S) | |||
14292 | PushOnScopeChains(CopyConstructor, S, false); | |||
14293 | ClassDecl->addDecl(CopyConstructor); | |||
14294 | ||||
14295 | return CopyConstructor; | |||
14296 | } | |||
14297 | ||||
14298 | void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, | |||
14299 | CXXConstructorDecl *CopyConstructor) { | |||
14300 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14304, __PRETTY_FUNCTION__)) | |||
14301 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14304, __PRETTY_FUNCTION__)) | |||
14302 | !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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14304, __PRETTY_FUNCTION__)) | |||
14303 | !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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14304, __PRETTY_FUNCTION__)) | |||
14304 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14304, __PRETTY_FUNCTION__)); | |||
14305 | if (CopyConstructor->willHaveBody() || CopyConstructor->isInvalidDecl()) | |||
14306 | return; | |||
14307 | ||||
14308 | CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); | |||
14309 | assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor")((ClassDecl && "DefineImplicitCopyConstructor - invalid constructor" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl && \"DefineImplicitCopyConstructor - invalid constructor\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14309, __PRETTY_FUNCTION__)); | |||
14310 | ||||
14311 | SynthesizedFunctionScope Scope(*this, CopyConstructor); | |||
14312 | ||||
14313 | // The exception specification is needed because we are defining the | |||
14314 | // function. | |||
14315 | ResolveExceptionSpec(CurrentLocation, | |||
14316 | CopyConstructor->getType()->castAs<FunctionProtoType>()); | |||
14317 | MarkVTableUsed(CurrentLocation, ClassDecl); | |||
14318 | ||||
14319 | // Add a context note for diagnostics produced after this point. | |||
14320 | Scope.addContextNote(CurrentLocation); | |||
14321 | ||||
14322 | // C++11 [class.copy]p7: | |||
14323 | // The [definition of an implicitly declared copy constructor] is | |||
14324 | // deprecated if the class has a user-declared copy assignment operator | |||
14325 | // or a user-declared destructor. | |||
14326 | if (getLangOpts().CPlusPlus11 && CopyConstructor->isImplicit()) | |||
14327 | diagnoseDeprecatedCopyOperation(*this, CopyConstructor); | |||
14328 | ||||
14329 | if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false)) { | |||
14330 | CopyConstructor->setInvalidDecl(); | |||
14331 | } else { | |||
14332 | SourceLocation Loc = CopyConstructor->getEndLoc().isValid() | |||
14333 | ? CopyConstructor->getEndLoc() | |||
14334 | : CopyConstructor->getLocation(); | |||
14335 | Sema::CompoundScopeRAII CompoundScope(*this); | |||
14336 | CopyConstructor->setBody( | |||
14337 | ActOnCompoundStmt(Loc, Loc, None, /*isStmtExpr=*/false).getAs<Stmt>()); | |||
14338 | CopyConstructor->markUsed(Context); | |||
14339 | } | |||
14340 | ||||
14341 | if (ASTMutationListener *L = getASTMutationListener()) { | |||
14342 | L->CompletedImplicitDefinition(CopyConstructor); | |||
14343 | } | |||
14344 | } | |||
14345 | ||||
14346 | CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( | |||
14347 | CXXRecordDecl *ClassDecl) { | |||
14348 | assert(ClassDecl->needsImplicitMoveConstructor())((ClassDecl->needsImplicitMoveConstructor()) ? static_cast <void> (0) : __assert_fail ("ClassDecl->needsImplicitMoveConstructor()" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14348, __PRETTY_FUNCTION__)); | |||
14349 | ||||
14350 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor); | |||
14351 | if (DSM.isAlreadyBeingDeclared()) | |||
14352 | return nullptr; | |||
14353 | ||||
14354 | QualType ClassType = Context.getTypeDeclType(ClassDecl); | |||
14355 | ||||
14356 | QualType ArgType = ClassType; | |||
14357 | LangAS AS = getDefaultCXXMethodAddrSpace(); | |||
14358 | if (AS != LangAS::Default) | |||
14359 | ArgType = Context.getAddrSpaceQualType(ClassType, AS); | |||
14360 | ArgType = Context.getRValueReferenceType(ArgType); | |||
14361 | ||||
14362 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, | |||
14363 | CXXMoveConstructor, | |||
14364 | false); | |||
14365 | ||||
14366 | DeclarationName Name | |||
14367 | = Context.DeclarationNames.getCXXConstructorName( | |||
14368 | Context.getCanonicalType(ClassType)); | |||
14369 | SourceLocation ClassLoc = ClassDecl->getLocation(); | |||
14370 | DeclarationNameInfo NameInfo(Name, ClassLoc); | |||
14371 | ||||
14372 | // C++11 [class.copy]p11: | |||
14373 | // An implicitly-declared copy/move constructor is an inline public | |||
14374 | // member of its class. | |||
14375 | CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( | |||
14376 | Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/nullptr, | |||
14377 | ExplicitSpecifier(), | |||
14378 | /*isInline=*/true, | |||
14379 | /*isImplicitlyDeclared=*/true, | |||
14380 | Constexpr ? CSK_constexpr : CSK_unspecified); | |||
14381 | MoveConstructor->setAccess(AS_public); | |||
14382 | MoveConstructor->setDefaulted(); | |||
14383 | ||||
14384 | if (getLangOpts().CUDA) { | |||
14385 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXMoveConstructor, | |||
14386 | MoveConstructor, | |||
14387 | /* ConstRHS */ false, | |||
14388 | /* Diagnose */ false); | |||
14389 | } | |||
14390 | ||||
14391 | setupImplicitSpecialMemberType(MoveConstructor, Context.VoidTy, ArgType); | |||
14392 | ||||
14393 | // Add the parameter to the constructor. | |||
14394 | ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, | |||
14395 | ClassLoc, ClassLoc, | |||
14396 | /*IdentifierInfo=*/nullptr, | |||
14397 | ArgType, /*TInfo=*/nullptr, | |||
14398 | SC_None, nullptr); | |||
14399 | MoveConstructor->setParams(FromParam); | |||
14400 | ||||
14401 | MoveConstructor->setTrivial( | |||
14402 | ClassDecl->needsOverloadResolutionForMoveConstructor() | |||
14403 | ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor) | |||
14404 | : ClassDecl->hasTrivialMoveConstructor()); | |||
14405 | ||||
14406 | MoveConstructor->setTrivialForCall( | |||
14407 | ClassDecl->hasAttr<TrivialABIAttr>() || | |||
14408 | (ClassDecl->needsOverloadResolutionForMoveConstructor() | |||
14409 | ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor, | |||
14410 | TAH_ConsiderTrivialABI) | |||
14411 | : ClassDecl->hasTrivialMoveConstructorForCall())); | |||
14412 | ||||
14413 | // Note that we have declared this constructor. | |||
14414 | ++getASTContext().NumImplicitMoveConstructorsDeclared; | |||
14415 | ||||
14416 | Scope *S = getScopeForContext(ClassDecl); | |||
14417 | CheckImplicitSpecialMemberDeclaration(S, MoveConstructor); | |||
14418 | ||||
14419 | if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { | |||
14420 | ClassDecl->setImplicitMoveConstructorIsDeleted(); | |||
14421 | SetDeclDeleted(MoveConstructor, ClassLoc); | |||
14422 | } | |||
14423 | ||||
14424 | if (S) | |||
14425 | PushOnScopeChains(MoveConstructor, S, false); | |||
14426 | ClassDecl->addDecl(MoveConstructor); | |||
14427 | ||||
14428 | return MoveConstructor; | |||
14429 | } | |||
14430 | ||||
14431 | void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, | |||
14432 | CXXConstructorDecl *MoveConstructor) { | |||
14433 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14437, __PRETTY_FUNCTION__)) | |||
14434 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14437, __PRETTY_FUNCTION__)) | |||
14435 | !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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14437, __PRETTY_FUNCTION__)) | |||
14436 | !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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14437, __PRETTY_FUNCTION__)) | |||
14437 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14437, __PRETTY_FUNCTION__)); | |||
14438 | if (MoveConstructor->willHaveBody() || MoveConstructor->isInvalidDecl()) | |||
14439 | return; | |||
14440 | ||||
14441 | CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); | |||
14442 | assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor")((ClassDecl && "DefineImplicitMoveConstructor - invalid constructor" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl && \"DefineImplicitMoveConstructor - invalid constructor\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14442, __PRETTY_FUNCTION__)); | |||
14443 | ||||
14444 | SynthesizedFunctionScope Scope(*this, MoveConstructor); | |||
14445 | ||||
14446 | // The exception specification is needed because we are defining the | |||
14447 | // function. | |||
14448 | ResolveExceptionSpec(CurrentLocation, | |||
14449 | MoveConstructor->getType()->castAs<FunctionProtoType>()); | |||
14450 | MarkVTableUsed(CurrentLocation, ClassDecl); | |||
14451 | ||||
14452 | // Add a context note for diagnostics produced after this point. | |||
14453 | Scope.addContextNote(CurrentLocation); | |||
14454 | ||||
14455 | if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false)) { | |||
14456 | MoveConstructor->setInvalidDecl(); | |||
14457 | } else { | |||
14458 | SourceLocation Loc = MoveConstructor->getEndLoc().isValid() | |||
14459 | ? MoveConstructor->getEndLoc() | |||
14460 | : MoveConstructor->getLocation(); | |||
14461 | Sema::CompoundScopeRAII CompoundScope(*this); | |||
14462 | MoveConstructor->setBody(ActOnCompoundStmt( | |||
14463 | Loc, Loc, None, /*isStmtExpr=*/ false).getAs<Stmt>()); | |||
14464 | MoveConstructor->markUsed(Context); | |||
14465 | } | |||
14466 | ||||
14467 | if (ASTMutationListener *L = getASTMutationListener()) { | |||
14468 | L->CompletedImplicitDefinition(MoveConstructor); | |||
14469 | } | |||
14470 | } | |||
14471 | ||||
14472 | bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { | |||
14473 | return FD->isDeleted() && FD->isDefaulted() && isa<CXXMethodDecl>(FD); | |||
14474 | } | |||
14475 | ||||
14476 | void Sema::DefineImplicitLambdaToFunctionPointerConversion( | |||
14477 | SourceLocation CurrentLocation, | |||
14478 | CXXConversionDecl *Conv) { | |||
14479 | SynthesizedFunctionScope Scope(*this, Conv); | |||
14480 | assert(!Conv->getReturnType()->isUndeducedType())((!Conv->getReturnType()->isUndeducedType()) ? static_cast <void> (0) : __assert_fail ("!Conv->getReturnType()->isUndeducedType()" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14480, __PRETTY_FUNCTION__)); | |||
14481 | ||||
14482 | CXXRecordDecl *Lambda = Conv->getParent(); | |||
14483 | FunctionDecl *CallOp = Lambda->getLambdaCallOperator(); | |||
14484 | FunctionDecl *Invoker = Lambda->getLambdaStaticInvoker(); | |||
14485 | ||||
14486 | if (auto *TemplateArgs = Conv->getTemplateSpecializationArgs()) { | |||
14487 | CallOp = InstantiateFunctionDeclaration( | |||
14488 | CallOp->getDescribedFunctionTemplate(), TemplateArgs, CurrentLocation); | |||
14489 | if (!CallOp) | |||
14490 | return; | |||
14491 | ||||
14492 | Invoker = InstantiateFunctionDeclaration( | |||
14493 | Invoker->getDescribedFunctionTemplate(), TemplateArgs, CurrentLocation); | |||
14494 | if (!Invoker) | |||
14495 | return; | |||
14496 | } | |||
14497 | ||||
14498 | if (CallOp->isInvalidDecl()) | |||
14499 | return; | |||
14500 | ||||
14501 | // Mark the call operator referenced (and add to pending instantiations | |||
14502 | // if necessary). | |||
14503 | // For both the conversion and static-invoker template specializations | |||
14504 | // we construct their body's in this function, so no need to add them | |||
14505 | // to the PendingInstantiations. | |||
14506 | MarkFunctionReferenced(CurrentLocation, CallOp); | |||
14507 | ||||
14508 | // Fill in the __invoke function with a dummy implementation. IR generation | |||
14509 | // will fill in the actual details. Update its type in case it contained | |||
14510 | // an 'auto'. | |||
14511 | Invoker->markUsed(Context); | |||
14512 | Invoker->setReferenced(); | |||
14513 | Invoker->setType(Conv->getReturnType()->getPointeeType()); | |||
14514 | Invoker->setBody(new (Context) CompoundStmt(Conv->getLocation())); | |||
14515 | ||||
14516 | // Construct the body of the conversion function { return __invoke; }. | |||
14517 | Expr *FunctionRef = BuildDeclRefExpr(Invoker, Invoker->getType(), | |||
14518 | VK_LValue, Conv->getLocation()); | |||
14519 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14519, __PRETTY_FUNCTION__)); | |||
14520 | Stmt *Return = BuildReturnStmt(Conv->getLocation(), FunctionRef).get(); | |||
14521 | Conv->setBody(CompoundStmt::Create(Context, Return, Conv->getLocation(), | |||
14522 | Conv->getLocation())); | |||
14523 | Conv->markUsed(Context); | |||
14524 | Conv->setReferenced(); | |||
14525 | ||||
14526 | if (ASTMutationListener *L = getASTMutationListener()) { | |||
14527 | L->CompletedImplicitDefinition(Conv); | |||
14528 | L->CompletedImplicitDefinition(Invoker); | |||
14529 | } | |||
14530 | } | |||
14531 | ||||
14532 | ||||
14533 | ||||
14534 | void Sema::DefineImplicitLambdaToBlockPointerConversion( | |||
14535 | SourceLocation CurrentLocation, | |||
14536 | CXXConversionDecl *Conv) | |||
14537 | { | |||
14538 | assert(!Conv->getParent()->isGenericLambda())((!Conv->getParent()->isGenericLambda()) ? static_cast< void> (0) : __assert_fail ("!Conv->getParent()->isGenericLambda()" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14538, __PRETTY_FUNCTION__)); | |||
14539 | ||||
14540 | SynthesizedFunctionScope Scope(*this, Conv); | |||
14541 | ||||
14542 | // Copy-initialize the lambda object as needed to capture it. | |||
14543 | Expr *This = ActOnCXXThis(CurrentLocation).get(); | |||
14544 | Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).get(); | |||
14545 | ||||
14546 | ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, | |||
14547 | Conv->getLocation(), | |||
14548 | Conv, DerefThis); | |||
14549 | ||||
14550 | // If we're not under ARC, make sure we still get the _Block_copy/autorelease | |||
14551 | // behavior. Note that only the general conversion function does this | |||
14552 | // (since it's unusable otherwise); in the case where we inline the | |||
14553 | // block literal, it has block literal lifetime semantics. | |||
14554 | if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) | |||
14555 | BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), | |||
14556 | CK_CopyAndAutoreleaseBlockObject, | |||
14557 | BuildBlock.get(), nullptr, VK_RValue); | |||
14558 | ||||
14559 | if (BuildBlock.isInvalid()) { | |||
14560 | Diag(CurrentLocation, diag::note_lambda_to_block_conv); | |||
14561 | Conv->setInvalidDecl(); | |||
14562 | return; | |||
14563 | } | |||
14564 | ||||
14565 | // Create the return statement that returns the block from the conversion | |||
14566 | // function. | |||
14567 | StmtResult Return = BuildReturnStmt(Conv->getLocation(), BuildBlock.get()); | |||
14568 | if (Return.isInvalid()) { | |||
14569 | Diag(CurrentLocation, diag::note_lambda_to_block_conv); | |||
14570 | Conv->setInvalidDecl(); | |||
14571 | return; | |||
14572 | } | |||
14573 | ||||
14574 | // Set the body of the conversion function. | |||
14575 | Stmt *ReturnS = Return.get(); | |||
14576 | Conv->setBody(CompoundStmt::Create(Context, ReturnS, Conv->getLocation(), | |||
14577 | Conv->getLocation())); | |||
14578 | Conv->markUsed(Context); | |||
14579 | ||||
14580 | // We're done; notify the mutation listener, if any. | |||
14581 | if (ASTMutationListener *L = getASTMutationListener()) { | |||
14582 | L->CompletedImplicitDefinition(Conv); | |||
14583 | } | |||
14584 | } | |||
14585 | ||||
14586 | /// Determine whether the given list arguments contains exactly one | |||
14587 | /// "real" (non-default) argument. | |||
14588 | static bool hasOneRealArgument(MultiExprArg Args) { | |||
14589 | switch (Args.size()) { | |||
14590 | case 0: | |||
14591 | return false; | |||
14592 | ||||
14593 | default: | |||
14594 | if (!Args[1]->isDefaultArgument()) | |||
14595 | return false; | |||
14596 | ||||
14597 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
14598 | case 1: | |||
14599 | return !Args[0]->isDefaultArgument(); | |||
14600 | } | |||
14601 | ||||
14602 | return false; | |||
14603 | } | |||
14604 | ||||
14605 | ExprResult | |||
14606 | Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, | |||
14607 | NamedDecl *FoundDecl, | |||
14608 | CXXConstructorDecl *Constructor, | |||
14609 | MultiExprArg ExprArgs, | |||
14610 | bool HadMultipleCandidates, | |||
14611 | bool IsListInitialization, | |||
14612 | bool IsStdInitListInitialization, | |||
14613 | bool RequiresZeroInit, | |||
14614 | unsigned ConstructKind, | |||
14615 | SourceRange ParenRange) { | |||
14616 | bool Elidable = false; | |||
14617 | ||||
14618 | // C++0x [class.copy]p34: | |||
14619 | // When certain criteria are met, an implementation is allowed to | |||
14620 | // omit the copy/move construction of a class object, even if the | |||
14621 | // copy/move constructor and/or destructor for the object have | |||
14622 | // side effects. [...] | |||
14623 | // - when a temporary class object that has not been bound to a | |||
14624 | // reference (12.2) would be copied/moved to a class object | |||
14625 | // with the same cv-unqualified type, the copy/move operation | |||
14626 | // can be omitted by constructing the temporary object | |||
14627 | // directly into the target of the omitted copy/move | |||
14628 | if (ConstructKind == CXXConstructExpr::CK_Complete && Constructor && | |||
14629 | Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { | |||
14630 | Expr *SubExpr = ExprArgs[0]; | |||
14631 | Elidable = SubExpr->isTemporaryObject( | |||
14632 | Context, cast<CXXRecordDecl>(FoundDecl->getDeclContext())); | |||
14633 | } | |||
14634 | ||||
14635 | return BuildCXXConstructExpr(ConstructLoc, DeclInitType, | |||
14636 | FoundDecl, Constructor, | |||
14637 | Elidable, ExprArgs, HadMultipleCandidates, | |||
14638 | IsListInitialization, | |||
14639 | IsStdInitListInitialization, RequiresZeroInit, | |||
14640 | ConstructKind, ParenRange); | |||
14641 | } | |||
14642 | ||||
14643 | ExprResult | |||
14644 | Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, | |||
14645 | NamedDecl *FoundDecl, | |||
14646 | CXXConstructorDecl *Constructor, | |||
14647 | bool Elidable, | |||
14648 | MultiExprArg ExprArgs, | |||
14649 | bool HadMultipleCandidates, | |||
14650 | bool IsListInitialization, | |||
14651 | bool IsStdInitListInitialization, | |||
14652 | bool RequiresZeroInit, | |||
14653 | unsigned ConstructKind, | |||
14654 | SourceRange ParenRange) { | |||
14655 | if (auto *Shadow = dyn_cast<ConstructorUsingShadowDecl>(FoundDecl)) { | |||
14656 | Constructor = findInheritingConstructor(ConstructLoc, Constructor, Shadow); | |||
14657 | if (DiagnoseUseOfDecl(Constructor, ConstructLoc)) | |||
14658 | return ExprError(); | |||
14659 | } | |||
14660 | ||||
14661 | return BuildCXXConstructExpr( | |||
14662 | ConstructLoc, DeclInitType, Constructor, Elidable, ExprArgs, | |||
14663 | HadMultipleCandidates, IsListInitialization, IsStdInitListInitialization, | |||
14664 | RequiresZeroInit, ConstructKind, ParenRange); | |||
14665 | } | |||
14666 | ||||
14667 | /// BuildCXXConstructExpr - Creates a complete call to a constructor, | |||
14668 | /// including handling of its default argument expressions. | |||
14669 | ExprResult | |||
14670 | Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, | |||
14671 | CXXConstructorDecl *Constructor, | |||
14672 | bool Elidable, | |||
14673 | MultiExprArg ExprArgs, | |||
14674 | bool HadMultipleCandidates, | |||
14675 | bool IsListInitialization, | |||
14676 | bool IsStdInitListInitialization, | |||
14677 | bool RequiresZeroInit, | |||
14678 | unsigned ConstructKind, | |||
14679 | SourceRange ParenRange) { | |||
14680 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14683, __PRETTY_FUNCTION__)) | |||
14681 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14683, __PRETTY_FUNCTION__)) | |||
14682 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14683, __PRETTY_FUNCTION__)) | |||
14683 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14683, __PRETTY_FUNCTION__)); | |||
14684 | MarkFunctionReferenced(ConstructLoc, Constructor); | |||
14685 | if (getLangOpts().CUDA && !CheckCUDACall(ConstructLoc, Constructor)) | |||
14686 | return ExprError(); | |||
14687 | ||||
14688 | return CXXConstructExpr::Create( | |||
14689 | Context, DeclInitType, ConstructLoc, Constructor, Elidable, | |||
14690 | ExprArgs, HadMultipleCandidates, IsListInitialization, | |||
14691 | IsStdInitListInitialization, RequiresZeroInit, | |||
14692 | static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), | |||
14693 | ParenRange); | |||
14694 | } | |||
14695 | ||||
14696 | ExprResult Sema::BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field) { | |||
14697 | assert(Field->hasInClassInitializer())((Field->hasInClassInitializer()) ? static_cast<void> (0) : __assert_fail ("Field->hasInClassInitializer()", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14697, __PRETTY_FUNCTION__)); | |||
14698 | ||||
14699 | // If we already have the in-class initializer nothing needs to be done. | |||
14700 | if (Field->getInClassInitializer()) | |||
14701 | return CXXDefaultInitExpr::Create(Context, Loc, Field, CurContext); | |||
14702 | ||||
14703 | // If we might have already tried and failed to instantiate, don't try again. | |||
14704 | if (Field->isInvalidDecl()) | |||
14705 | return ExprError(); | |||
14706 | ||||
14707 | // Maybe we haven't instantiated the in-class initializer. Go check the | |||
14708 | // pattern FieldDecl to see if it has one. | |||
14709 | CXXRecordDecl *ParentRD = cast<CXXRecordDecl>(Field->getParent()); | |||
14710 | ||||
14711 | if (isTemplateInstantiation(ParentRD->getTemplateSpecializationKind())) { | |||
14712 | CXXRecordDecl *ClassPattern = ParentRD->getTemplateInstantiationPattern(); | |||
14713 | DeclContext::lookup_result Lookup = | |||
14714 | ClassPattern->lookup(Field->getDeclName()); | |||
14715 | ||||
14716 | // Lookup can return at most two results: the pattern for the field, or the | |||
14717 | // injected class name of the parent record. No other member can have the | |||
14718 | // same name as the field. | |||
14719 | // In modules mode, lookup can return multiple results (coming from | |||
14720 | // different modules). | |||
14721 | assert((getLangOpts().Modules || (!Lookup.empty() && Lookup.size() <= 2)) &&(((getLangOpts().Modules || (!Lookup.empty() && Lookup .size() <= 2)) && "more than two lookup results for field name" ) ? static_cast<void> (0) : __assert_fail ("(getLangOpts().Modules || (!Lookup.empty() && Lookup.size() <= 2)) && \"more than two lookup results for field name\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14722, __PRETTY_FUNCTION__)) | |||
14722 | "more than two lookup results for field name")(((getLangOpts().Modules || (!Lookup.empty() && Lookup .size() <= 2)) && "more than two lookup results for field name" ) ? static_cast<void> (0) : __assert_fail ("(getLangOpts().Modules || (!Lookup.empty() && Lookup.size() <= 2)) && \"more than two lookup results for field name\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14722, __PRETTY_FUNCTION__)); | |||
14723 | FieldDecl *Pattern = dyn_cast<FieldDecl>(Lookup[0]); | |||
14724 | if (!Pattern) { | |||
14725 | assert(isa<CXXRecordDecl>(Lookup[0]) &&((isa<CXXRecordDecl>(Lookup[0]) && "cannot have other non-field member with same name" ) ? static_cast<void> (0) : __assert_fail ("isa<CXXRecordDecl>(Lookup[0]) && \"cannot have other non-field member with same name\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14726, __PRETTY_FUNCTION__)) | |||
14726 | "cannot have other non-field member with same name")((isa<CXXRecordDecl>(Lookup[0]) && "cannot have other non-field member with same name" ) ? static_cast<void> (0) : __assert_fail ("isa<CXXRecordDecl>(Lookup[0]) && \"cannot have other non-field member with same name\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14726, __PRETTY_FUNCTION__)); | |||
14727 | for (auto L : Lookup) | |||
14728 | if (isa<FieldDecl>(L)) { | |||
14729 | Pattern = cast<FieldDecl>(L); | |||
14730 | break; | |||
14731 | } | |||
14732 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 14732, __PRETTY_FUNCTION__)); | |||
14733 | } | |||
14734 | ||||
14735 | if (!Pattern->hasInClassInitializer() || | |||
14736 | InstantiateInClassInitializer(Loc, Field, Pattern, | |||
14737 | getTemplateInstantiationArgs(Field))) { | |||
14738 | // Don't diagnose this again. | |||
14739 | Field->setInvalidDecl(); | |||
14740 | return ExprError(); | |||
14741 | } | |||
14742 | return CXXDefaultInitExpr::Create(Context, Loc, Field, CurContext); | |||
14743 | } | |||
14744 | ||||
14745 | // DR1351: | |||
14746 | // If the brace-or-equal-initializer of a non-static data member | |||
14747 | // invokes a defaulted default constructor of its class or of an | |||
14748 | // enclosing class in a potentially evaluated subexpression, the | |||
14749 | // program is ill-formed. | |||
14750 | // | |||
14751 | // This resolution is unworkable: the exception specification of the | |||
14752 | // default constructor can be needed in an unevaluated context, in | |||
14753 | // particular, in the operand of a noexcept-expression, and we can be | |||
14754 | // unable to compute an exception specification for an enclosed class. | |||
14755 | // | |||
14756 | // Any attempt to resolve the exception specification of a defaulted default | |||
14757 | // constructor before the initializer is lexically complete will ultimately | |||
14758 | // come here at which point we can diagnose it. | |||
14759 | RecordDecl *OutermostClass = ParentRD->getOuterLexicalRecordContext(); | |||
14760 | Diag(Loc, diag::err_in_class_initializer_not_yet_parsed) | |||
14761 | << OutermostClass << Field; | |||
14762 | Diag(Field->getEndLoc(), diag::note_in_class_initializer_not_yet_parsed); | |||
14763 | // Recover by marking the field invalid, unless we're in a SFINAE context. | |||
14764 | if (!isSFINAEContext()) | |||
14765 | Field->setInvalidDecl(); | |||
14766 | return ExprError(); | |||
14767 | } | |||
14768 | ||||
14769 | void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { | |||
14770 | if (VD->isInvalidDecl()) return; | |||
14771 | ||||
14772 | CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); | |||
14773 | if (ClassDecl->isInvalidDecl()) return; | |||
14774 | if (ClassDecl->hasIrrelevantDestructor()) return; | |||
14775 | if (ClassDecl->isDependentContext()) return; | |||
14776 | ||||
14777 | if (VD->isNoDestroy(getASTContext())) | |||
14778 | return; | |||
14779 | ||||
14780 | CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); | |||
14781 | ||||
14782 | // If this is an array, we'll require the destructor during initialization, so | |||
14783 | // we can skip over this. We still want to emit exit-time destructor warnings | |||
14784 | // though. | |||
14785 | if (!VD->getType()->isArrayType()) { | |||
14786 | MarkFunctionReferenced(VD->getLocation(), Destructor); | |||
14787 | CheckDestructorAccess(VD->getLocation(), Destructor, | |||
14788 | PDiag(diag::err_access_dtor_var) | |||
14789 | << VD->getDeclName() << VD->getType()); | |||
14790 | DiagnoseUseOfDecl(Destructor, VD->getLocation()); | |||
14791 | } | |||
14792 | ||||
14793 | if (Destructor->isTrivial()) return; | |||
14794 | ||||
14795 | // If the destructor is constexpr, check whether the variable has constant | |||
14796 | // destruction now. | |||
14797 | if (Destructor->isConstexpr()) { | |||
14798 | bool HasConstantInit = false; | |||
14799 | if (VD->getInit() && !VD->getInit()->isValueDependent()) | |||
14800 | HasConstantInit = VD->evaluateValue(); | |||
14801 | SmallVector<PartialDiagnosticAt, 8> Notes; | |||
14802 | if (!VD->evaluateDestruction(Notes) && VD->isConstexpr() && | |||
14803 | HasConstantInit) { | |||
14804 | Diag(VD->getLocation(), | |||
14805 | diag::err_constexpr_var_requires_const_destruction) << VD; | |||
14806 | for (unsigned I = 0, N = Notes.size(); I != N; ++I) | |||
14807 | Diag(Notes[I].first, Notes[I].second); | |||
14808 | } | |||
14809 | } | |||
14810 | ||||
14811 | if (!VD->hasGlobalStorage()) return; | |||
14812 | ||||
14813 | // Emit warning for non-trivial dtor in global scope (a real global, | |||
14814 | // class-static, function-static). | |||
14815 | Diag(VD->getLocation(), diag::warn_exit_time_destructor); | |||
14816 | ||||
14817 | // TODO: this should be re-enabled for static locals by !CXAAtExit | |||
14818 | if (!VD->isStaticLocal()) | |||
14819 | Diag(VD->getLocation(), diag::warn_global_destructor); | |||
14820 | } | |||
14821 | ||||
14822 | /// Given a constructor and the set of arguments provided for the | |||
14823 | /// constructor, convert the arguments and add any required default arguments | |||
14824 | /// to form a proper call to this constructor. | |||
14825 | /// | |||
14826 | /// \returns true if an error occurred, false otherwise. | |||
14827 | bool | |||
14828 | Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, | |||
14829 | MultiExprArg ArgsPtr, | |||
14830 | SourceLocation Loc, | |||
14831 | SmallVectorImpl<Expr*> &ConvertedArgs, | |||
14832 | bool AllowExplicit, | |||
14833 | bool IsListInitialization) { | |||
14834 | // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. | |||
14835 | unsigned NumArgs = ArgsPtr.size(); | |||
14836 | Expr **Args = ArgsPtr.data(); | |||
14837 | ||||
14838 | const auto *Proto = Constructor->getType()->castAs<FunctionProtoType>(); | |||
14839 | unsigned NumParams = Proto->getNumParams(); | |||
14840 | ||||
14841 | // If too few arguments are available, we'll fill in the rest with defaults. | |||
14842 | if (NumArgs < NumParams) | |||
14843 | ConvertedArgs.reserve(NumParams); | |||
14844 | else | |||
14845 | ConvertedArgs.reserve(NumArgs); | |||
14846 | ||||
14847 | VariadicCallType CallType = | |||
14848 | Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; | |||
14849 | SmallVector<Expr *, 8> AllArgs; | |||
14850 | bool Invalid = GatherArgumentsForCall(Loc, Constructor, | |||
14851 | Proto, 0, | |||
14852 | llvm::makeArrayRef(Args, NumArgs), | |||
14853 | AllArgs, | |||
14854 | CallType, AllowExplicit, | |||
14855 | IsListInitialization); | |||
14856 | ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); | |||
14857 | ||||
14858 | DiagnoseSentinelCalls(Constructor, Loc, AllArgs); | |||
14859 | ||||
14860 | CheckConstructorCall(Constructor, | |||
14861 | llvm::makeArrayRef(AllArgs.data(), AllArgs.size()), | |||
14862 | Proto, Loc); | |||
14863 | ||||
14864 | return Invalid; | |||
14865 | } | |||
14866 | ||||
14867 | static inline bool | |||
14868 | CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, | |||
14869 | const FunctionDecl *FnDecl) { | |||
14870 | const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); | |||
14871 | if (isa<NamespaceDecl>(DC)) { | |||
14872 | return SemaRef.Diag(FnDecl->getLocation(), | |||
14873 | diag::err_operator_new_delete_declared_in_namespace) | |||
14874 | << FnDecl->getDeclName(); | |||
14875 | } | |||
14876 | ||||
14877 | if (isa<TranslationUnitDecl>(DC) && | |||
14878 | FnDecl->getStorageClass() == SC_Static) { | |||
14879 | return SemaRef.Diag(FnDecl->getLocation(), | |||
14880 | diag::err_operator_new_delete_declared_static) | |||
14881 | << FnDecl->getDeclName(); | |||
14882 | } | |||
14883 | ||||
14884 | return false; | |||
14885 | } | |||
14886 | ||||
14887 | static QualType | |||
14888 | RemoveAddressSpaceFromPtr(Sema &SemaRef, const PointerType *PtrTy) { | |||
14889 | QualType QTy = PtrTy->getPointeeType(); | |||
14890 | QTy = SemaRef.Context.removeAddrSpaceQualType(QTy); | |||
14891 | return SemaRef.Context.getPointerType(QTy); | |||
14892 | } | |||
14893 | ||||
14894 | static inline bool | |||
14895 | CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, | |||
14896 | CanQualType ExpectedResultType, | |||
14897 | CanQualType ExpectedFirstParamType, | |||
14898 | unsigned DependentParamTypeDiag, | |||
14899 | unsigned InvalidParamTypeDiag) { | |||
14900 | QualType ResultType = | |||
14901 | FnDecl->getType()->castAs<FunctionType>()->getReturnType(); | |||
14902 | ||||
14903 | // Check that the result type is not dependent. | |||
14904 | if (ResultType->isDependentType()) | |||
14905 | return SemaRef.Diag(FnDecl->getLocation(), | |||
14906 | diag::err_operator_new_delete_dependent_result_type) | |||
14907 | << FnDecl->getDeclName() << ExpectedResultType; | |||
14908 | ||||
14909 | // The operator is valid on any address space for OpenCL. | |||
14910 | if (SemaRef.getLangOpts().OpenCLCPlusPlus) { | |||
14911 | if (auto *PtrTy = ResultType->getAs<PointerType>()) { | |||
14912 | ResultType = RemoveAddressSpaceFromPtr(SemaRef, PtrTy); | |||
14913 | } | |||
14914 | } | |||
14915 | ||||
14916 | // Check that the result type is what we expect. | |||
14917 | if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) | |||
14918 | return SemaRef.Diag(FnDecl->getLocation(), | |||
14919 | diag::err_operator_new_delete_invalid_result_type) | |||
14920 | << FnDecl->getDeclName() << ExpectedResultType; | |||
14921 | ||||
14922 | // A function template must have at least 2 parameters. | |||
14923 | if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) | |||
14924 | return SemaRef.Diag(FnDecl->getLocation(), | |||
14925 | diag::err_operator_new_delete_template_too_few_parameters) | |||
14926 | << FnDecl->getDeclName(); | |||
14927 | ||||
14928 | // The function decl must have at least 1 parameter. | |||
14929 | if (FnDecl->getNumParams() == 0) | |||
14930 | return SemaRef.Diag(FnDecl->getLocation(), | |||
14931 | diag::err_operator_new_delete_too_few_parameters) | |||
14932 | << FnDecl->getDeclName(); | |||
14933 | ||||
14934 | // Check the first parameter type is not dependent. | |||
14935 | QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); | |||
14936 | if (FirstParamType->isDependentType()) | |||
14937 | return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) | |||
14938 | << FnDecl->getDeclName() << ExpectedFirstParamType; | |||
14939 | ||||
14940 | // Check that the first parameter type is what we expect. | |||
14941 | if (SemaRef.getLangOpts().OpenCLCPlusPlus) { | |||
14942 | // The operator is valid on any address space for OpenCL. | |||
14943 | if (auto *PtrTy = | |||
14944 | FnDecl->getParamDecl(0)->getType()->getAs<PointerType>()) { | |||
14945 | FirstParamType = RemoveAddressSpaceFromPtr(SemaRef, PtrTy); | |||
14946 | } | |||
14947 | } | |||
14948 | if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != | |||
14949 | ExpectedFirstParamType) | |||
14950 | return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) | |||
14951 | << FnDecl->getDeclName() << ExpectedFirstParamType; | |||
14952 | ||||
14953 | return false; | |||
14954 | } | |||
14955 | ||||
14956 | static bool | |||
14957 | CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { | |||
14958 | // C++ [basic.stc.dynamic.allocation]p1: | |||
14959 | // A program is ill-formed if an allocation function is declared in a | |||
14960 | // namespace scope other than global scope or declared static in global | |||
14961 | // scope. | |||
14962 | if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) | |||
14963 | return true; | |||
14964 | ||||
14965 | CanQualType SizeTy = | |||
14966 | SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); | |||
14967 | ||||
14968 | // C++ [basic.stc.dynamic.allocation]p1: | |||
14969 | // The return type shall be void*. The first parameter shall have type | |||
14970 | // std::size_t. | |||
14971 | if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, | |||
14972 | SizeTy, | |||
14973 | diag::err_operator_new_dependent_param_type, | |||
14974 | diag::err_operator_new_param_type)) | |||
14975 | return true; | |||
14976 | ||||
14977 | // C++ [basic.stc.dynamic.allocation]p1: | |||
14978 | // The first parameter shall not have an associated default argument. | |||
14979 | if (FnDecl->getParamDecl(0)->hasDefaultArg()) | |||
14980 | return SemaRef.Diag(FnDecl->getLocation(), | |||
14981 | diag::err_operator_new_default_arg) | |||
14982 | << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); | |||
14983 | ||||
14984 | return false; | |||
14985 | } | |||
14986 | ||||
14987 | static bool | |||
14988 | CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { | |||
14989 | // C++ [basic.stc.dynamic.deallocation]p1: | |||
14990 | // A program is ill-formed if deallocation functions are declared in a | |||
14991 | // namespace scope other than global scope or declared static in global | |||
14992 | // scope. | |||
14993 | if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) | |||
14994 | return true; | |||
14995 | ||||
14996 | auto *MD = dyn_cast<CXXMethodDecl>(FnDecl); | |||
14997 | ||||
14998 | // C++ P0722: | |||
14999 | // Within a class C, the first parameter of a destroying operator delete | |||
15000 | // shall be of type C *. The first parameter of any other deallocation | |||
15001 | // function shall be of type void *. | |||
15002 | CanQualType ExpectedFirstParamType = | |||
15003 | MD && MD->isDestroyingOperatorDelete() | |||
15004 | ? SemaRef.Context.getCanonicalType(SemaRef.Context.getPointerType( | |||
15005 | SemaRef.Context.getRecordType(MD->getParent()))) | |||
15006 | : SemaRef.Context.VoidPtrTy; | |||
15007 | ||||
15008 | // C++ [basic.stc.dynamic.deallocation]p2: | |||
15009 | // Each deallocation function shall return void | |||
15010 | if (CheckOperatorNewDeleteTypes( | |||
15011 | SemaRef, FnDecl, SemaRef.Context.VoidTy, ExpectedFirstParamType, | |||
15012 | diag::err_operator_delete_dependent_param_type, | |||
15013 | diag::err_operator_delete_param_type)) | |||
15014 | return true; | |||
15015 | ||||
15016 | // C++ P0722: | |||
15017 | // A destroying operator delete shall be a usual deallocation function. | |||
15018 | if (MD && !MD->getParent()->isDependentContext() && | |||
15019 | MD->isDestroyingOperatorDelete() && | |||
15020 | !SemaRef.isUsualDeallocationFunction(MD)) { | |||
15021 | SemaRef.Diag(MD->getLocation(), | |||
15022 | diag::err_destroying_operator_delete_not_usual); | |||
15023 | return true; | |||
15024 | } | |||
15025 | ||||
15026 | return false; | |||
15027 | } | |||
15028 | ||||
15029 | /// CheckOverloadedOperatorDeclaration - Check whether the declaration | |||
15030 | /// of this overloaded operator is well-formed. If so, returns false; | |||
15031 | /// otherwise, emits appropriate diagnostics and returns true. | |||
15032 | bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { | |||
15033 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 15034, __PRETTY_FUNCTION__)) | |||
15034 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 15034, __PRETTY_FUNCTION__)); | |||
15035 | ||||
15036 | OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); | |||
15037 | ||||
15038 | // C++ [over.oper]p5: | |||
15039 | // The allocation and deallocation functions, operator new, | |||
15040 | // operator new[], operator delete and operator delete[], are | |||
15041 | // described completely in 3.7.3. The attributes and restrictions | |||
15042 | // found in the rest of this subclause do not apply to them unless | |||
15043 | // explicitly stated in 3.7.3. | |||
15044 | if (Op == OO_Delete || Op == OO_Array_Delete) | |||
15045 | return CheckOperatorDeleteDeclaration(*this, FnDecl); | |||
15046 | ||||
15047 | if (Op == OO_New || Op == OO_Array_New) | |||
15048 | return CheckOperatorNewDeclaration(*this, FnDecl); | |||
15049 | ||||
15050 | // C++ [over.oper]p6: | |||
15051 | // An operator function shall either be a non-static member | |||
15052 | // function or be a non-member function and have at least one | |||
15053 | // parameter whose type is a class, a reference to a class, an | |||
15054 | // enumeration, or a reference to an enumeration. | |||
15055 | if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { | |||
15056 | if (MethodDecl->isStatic()) | |||
15057 | return Diag(FnDecl->getLocation(), | |||
15058 | diag::err_operator_overload_static) << FnDecl->getDeclName(); | |||
15059 | } else { | |||
15060 | bool ClassOrEnumParam = false; | |||
15061 | for (auto Param : FnDecl->parameters()) { | |||
15062 | QualType ParamType = Param->getType().getNonReferenceType(); | |||
15063 | if (ParamType->isDependentType() || ParamType->isRecordType() || | |||
15064 | ParamType->isEnumeralType()) { | |||
15065 | ClassOrEnumParam = true; | |||
15066 | break; | |||
15067 | } | |||
15068 | } | |||
15069 | ||||
15070 | if (!ClassOrEnumParam) | |||
15071 | return Diag(FnDecl->getLocation(), | |||
15072 | diag::err_operator_overload_needs_class_or_enum) | |||
15073 | << FnDecl->getDeclName(); | |||
15074 | } | |||
15075 | ||||
15076 | // C++ [over.oper]p8: | |||
15077 | // An operator function cannot have default arguments (8.3.6), | |||
15078 | // except where explicitly stated below. | |||
15079 | // | |||
15080 | // Only the function-call operator allows default arguments | |||
15081 | // (C++ [over.call]p1). | |||
15082 | if (Op != OO_Call) { | |||
15083 | for (auto Param : FnDecl->parameters()) { | |||
15084 | if (Param->hasDefaultArg()) | |||
15085 | return Diag(Param->getLocation(), | |||
15086 | diag::err_operator_overload_default_arg) | |||
15087 | << FnDecl->getDeclName() << Param->getDefaultArgRange(); | |||
15088 | } | |||
15089 | } | |||
15090 | ||||
15091 | static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { | |||
15092 | { false, false, false } | |||
15093 | #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ | |||
15094 | , { Unary, Binary, MemberOnly } | |||
15095 | #include "clang/Basic/OperatorKinds.def" | |||
15096 | }; | |||
15097 | ||||
15098 | bool CanBeUnaryOperator = OperatorUses[Op][0]; | |||
15099 | bool CanBeBinaryOperator = OperatorUses[Op][1]; | |||
15100 | bool MustBeMemberOperator = OperatorUses[Op][2]; | |||
15101 | ||||
15102 | // C++ [over.oper]p8: | |||
15103 | // [...] Operator functions cannot have more or fewer parameters | |||
15104 | // than the number required for the corresponding operator, as | |||
15105 | // described in the rest of this subclause. | |||
15106 | unsigned NumParams = FnDecl->getNumParams() | |||
15107 | + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); | |||
15108 | if (Op != OO_Call && | |||
15109 | ((NumParams == 1 && !CanBeUnaryOperator) || | |||
15110 | (NumParams == 2 && !CanBeBinaryOperator) || | |||
15111 | (NumParams < 1) || (NumParams > 2))) { | |||
15112 | // We have the wrong number of parameters. | |||
15113 | unsigned ErrorKind; | |||
15114 | if (CanBeUnaryOperator && CanBeBinaryOperator) { | |||
15115 | ErrorKind = 2; // 2 -> unary or binary. | |||
15116 | } else if (CanBeUnaryOperator) { | |||
15117 | ErrorKind = 0; // 0 -> unary | |||
15118 | } else { | |||
15119 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 15120, __PRETTY_FUNCTION__)) | |||
15120 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 15120, __PRETTY_FUNCTION__)); | |||
15121 | ErrorKind = 1; // 1 -> binary | |||
15122 | } | |||
15123 | ||||
15124 | return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) | |||
15125 | << FnDecl->getDeclName() << NumParams << ErrorKind; | |||
15126 | } | |||
15127 | ||||
15128 | // Overloaded operators other than operator() cannot be variadic. | |||
15129 | if (Op != OO_Call && | |||
15130 | FnDecl->getType()->castAs<FunctionProtoType>()->isVariadic()) { | |||
15131 | return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) | |||
15132 | << FnDecl->getDeclName(); | |||
15133 | } | |||
15134 | ||||
15135 | // Some operators must be non-static member functions. | |||
15136 | if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { | |||
15137 | return Diag(FnDecl->getLocation(), | |||
15138 | diag::err_operator_overload_must_be_member) | |||
15139 | << FnDecl->getDeclName(); | |||
15140 | } | |||
15141 | ||||
15142 | // C++ [over.inc]p1: | |||
15143 | // The user-defined function called operator++ implements the | |||
15144 | // prefix and postfix ++ operator. If this function is a member | |||
15145 | // function with no parameters, or a non-member function with one | |||
15146 | // parameter of class or enumeration type, it defines the prefix | |||
15147 | // increment operator ++ for objects of that type. If the function | |||
15148 | // is a member function with one parameter (which shall be of type | |||
15149 | // int) or a non-member function with two parameters (the second | |||
15150 | // of which shall be of type int), it defines the postfix | |||
15151 | // increment operator ++ for objects of that type. | |||
15152 | if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { | |||
15153 | ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); | |||
15154 | QualType ParamType = LastParam->getType(); | |||
15155 | ||||
15156 | if (!ParamType->isSpecificBuiltinType(BuiltinType::Int) && | |||
15157 | !ParamType->isDependentType()) | |||
15158 | return Diag(LastParam->getLocation(), | |||
15159 | diag::err_operator_overload_post_incdec_must_be_int) | |||
15160 | << LastParam->getType() << (Op == OO_MinusMinus); | |||
15161 | } | |||
15162 | ||||
15163 | return false; | |||
15164 | } | |||
15165 | ||||
15166 | static bool | |||
15167 | checkLiteralOperatorTemplateParameterList(Sema &SemaRef, | |||
15168 | FunctionTemplateDecl *TpDecl) { | |||
15169 | TemplateParameterList *TemplateParams = TpDecl->getTemplateParameters(); | |||
15170 | ||||
15171 | // Must have one or two template parameters. | |||
15172 | if (TemplateParams->size() == 1) { | |||
15173 | NonTypeTemplateParmDecl *PmDecl = | |||
15174 | dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(0)); | |||
15175 | ||||
15176 | // The template parameter must be a char parameter pack. | |||
15177 | if (PmDecl && PmDecl->isTemplateParameterPack() && | |||
15178 | SemaRef.Context.hasSameType(PmDecl->getType(), SemaRef.Context.CharTy)) | |||
15179 | return false; | |||
15180 | ||||
15181 | } else if (TemplateParams->size() == 2) { | |||
15182 | TemplateTypeParmDecl *PmType = | |||
15183 | dyn_cast<TemplateTypeParmDecl>(TemplateParams->getParam(0)); | |||
15184 | NonTypeTemplateParmDecl *PmArgs = | |||
15185 | dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(1)); | |||
15186 | ||||
15187 | // The second template parameter must be a parameter pack with the | |||
15188 | // first template parameter as its type. | |||
15189 | if (PmType && PmArgs && !PmType->isTemplateParameterPack() && | |||
15190 | PmArgs->isTemplateParameterPack()) { | |||
15191 | const TemplateTypeParmType *TArgs = | |||
15192 | PmArgs->getType()->getAs<TemplateTypeParmType>(); | |||
15193 | if (TArgs && TArgs->getDepth() == PmType->getDepth() && | |||
15194 | TArgs->getIndex() == PmType->getIndex()) { | |||
15195 | if (!SemaRef.inTemplateInstantiation()) | |||
15196 | SemaRef.Diag(TpDecl->getLocation(), | |||
15197 | diag::ext_string_literal_operator_template); | |||
15198 | return false; | |||
15199 | } | |||
15200 | } | |||
15201 | } | |||
15202 | ||||
15203 | SemaRef.Diag(TpDecl->getTemplateParameters()->getSourceRange().getBegin(), | |||
15204 | diag::err_literal_operator_template) | |||
15205 | << TpDecl->getTemplateParameters()->getSourceRange(); | |||
15206 | return true; | |||
15207 | } | |||
15208 | ||||
15209 | /// CheckLiteralOperatorDeclaration - Check whether the declaration | |||
15210 | /// of this literal operator function is well-formed. If so, returns | |||
15211 | /// false; otherwise, emits appropriate diagnostics and returns true. | |||
15212 | bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { | |||
15213 | if (isa<CXXMethodDecl>(FnDecl)) { | |||
15214 | Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) | |||
15215 | << FnDecl->getDeclName(); | |||
15216 | return true; | |||
15217 | } | |||
15218 | ||||
15219 | if (FnDecl->isExternC()) { | |||
15220 | Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); | |||
15221 | if (const LinkageSpecDecl *LSD = | |||
15222 | FnDecl->getDeclContext()->getExternCContext()) | |||
15223 | Diag(LSD->getExternLoc(), diag::note_extern_c_begins_here); | |||
15224 | return true; | |||
15225 | } | |||
15226 | ||||
15227 | // This might be the definition of a literal operator template. | |||
15228 | FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); | |||
15229 | ||||
15230 | // This might be a specialization of a literal operator template. | |||
15231 | if (!TpDecl) | |||
15232 | TpDecl = FnDecl->getPrimaryTemplate(); | |||
15233 | ||||
15234 | // template <char...> type operator "" name() and | |||
15235 | // template <class T, T...> type operator "" name() are the only valid | |||
15236 | // template signatures, and the only valid signatures with no parameters. | |||
15237 | if (TpDecl) { | |||
15238 | if (FnDecl->param_size() != 0) { | |||
15239 | Diag(FnDecl->getLocation(), | |||
15240 | diag::err_literal_operator_template_with_params); | |||
15241 | return true; | |||
15242 | } | |||
15243 | ||||
15244 | if (checkLiteralOperatorTemplateParameterList(*this, TpDecl)) | |||
15245 | return true; | |||
15246 | ||||
15247 | } else if (FnDecl->param_size() == 1) { | |||
15248 | const ParmVarDecl *Param = FnDecl->getParamDecl(0); | |||
15249 | ||||
15250 | QualType ParamType = Param->getType().getUnqualifiedType(); | |||
15251 | ||||
15252 | // Only unsigned long long int, long double, any character type, and const | |||
15253 | // char * are allowed as the only parameters. | |||
15254 | if (ParamType->isSpecificBuiltinType(BuiltinType::ULongLong) || | |||
15255 | ParamType->isSpecificBuiltinType(BuiltinType::LongDouble) || | |||
15256 | Context.hasSameType(ParamType, Context.CharTy) || | |||
15257 | Context.hasSameType(ParamType, Context.WideCharTy) || | |||
15258 | Context.hasSameType(ParamType, Context.Char8Ty) || | |||
15259 | Context.hasSameType(ParamType, Context.Char16Ty) || | |||
15260 | Context.hasSameType(ParamType, Context.Char32Ty)) { | |||
15261 | } else if (const PointerType *Ptr = ParamType->getAs<PointerType>()) { | |||
15262 | QualType InnerType = Ptr->getPointeeType(); | |||
15263 | ||||
15264 | // Pointer parameter must be a const char *. | |||
15265 | if (!(Context.hasSameType(InnerType.getUnqualifiedType(), | |||
15266 | Context.CharTy) && | |||
15267 | InnerType.isConstQualified() && !InnerType.isVolatileQualified())) { | |||
15268 | Diag(Param->getSourceRange().getBegin(), | |||
15269 | diag::err_literal_operator_param) | |||
15270 | << ParamType << "'const char *'" << Param->getSourceRange(); | |||
15271 | return true; | |||
15272 | } | |||
15273 | ||||
15274 | } else if (ParamType->isRealFloatingType()) { | |||
15275 | Diag(Param->getSourceRange().getBegin(), diag::err_literal_operator_param) | |||
15276 | << ParamType << Context.LongDoubleTy << Param->getSourceRange(); | |||
15277 | return true; | |||
15278 | ||||
15279 | } else if (ParamType->isIntegerType()) { | |||
15280 | Diag(Param->getSourceRange().getBegin(), diag::err_literal_operator_param) | |||
15281 | << ParamType << Context.UnsignedLongLongTy << Param->getSourceRange(); | |||
15282 | return true; | |||
15283 | ||||
15284 | } else { | |||
15285 | Diag(Param->getSourceRange().getBegin(), | |||
15286 | diag::err_literal_operator_invalid_param) | |||
15287 | << ParamType << Param->getSourceRange(); | |||
15288 | return true; | |||
15289 | } | |||
15290 | ||||
15291 | } else if (FnDecl->param_size() == 2) { | |||
15292 | FunctionDecl::param_iterator Param = FnDecl->param_begin(); | |||
15293 | ||||
15294 | // First, verify that the first parameter is correct. | |||
15295 | ||||
15296 | QualType FirstParamType = (*Param)->getType().getUnqualifiedType(); | |||
15297 | ||||
15298 | // Two parameter function must have a pointer to const as a | |||
15299 | // first parameter; let's strip those qualifiers. | |||
15300 | const PointerType *PT = FirstParamType->getAs<PointerType>(); | |||
15301 | ||||
15302 | if (!PT) { | |||
15303 | Diag((*Param)->getSourceRange().getBegin(), | |||
15304 | diag::err_literal_operator_param) | |||
15305 | << FirstParamType << "'const char *'" << (*Param)->getSourceRange(); | |||
15306 | return true; | |||
15307 | } | |||
15308 | ||||
15309 | QualType PointeeType = PT->getPointeeType(); | |||
15310 | // First parameter must be const | |||
15311 | if (!PointeeType.isConstQualified() || PointeeType.isVolatileQualified()) { | |||
15312 | Diag((*Param)->getSourceRange().getBegin(), | |||
15313 | diag::err_literal_operator_param) | |||
15314 | << FirstParamType << "'const char *'" << (*Param)->getSourceRange(); | |||
15315 | return true; | |||
15316 | } | |||
15317 | ||||
15318 | QualType InnerType = PointeeType.getUnqualifiedType(); | |||
15319 | // Only const char *, const wchar_t*, const char8_t*, const char16_t*, and | |||
15320 | // const char32_t* are allowed as the first parameter to a two-parameter | |||
15321 | // function | |||
15322 | if (!(Context.hasSameType(InnerType, Context.CharTy) || | |||
15323 | Context.hasSameType(InnerType, Context.WideCharTy) || | |||
15324 | Context.hasSameType(InnerType, Context.Char8Ty) || | |||
15325 | Context.hasSameType(InnerType, Context.Char16Ty) || | |||
15326 | Context.hasSameType(InnerType, Context.Char32Ty))) { | |||
15327 | Diag((*Param)->getSourceRange().getBegin(), | |||
15328 | diag::err_literal_operator_param) | |||
15329 | << FirstParamType << "'const char *'" << (*Param)->getSourceRange(); | |||
15330 | return true; | |||
15331 | } | |||
15332 | ||||
15333 | // Move on to the second and final parameter. | |||
15334 | ++Param; | |||
15335 | ||||
15336 | // The second parameter must be a std::size_t. | |||
15337 | QualType SecondParamType = (*Param)->getType().getUnqualifiedType(); | |||
15338 | if (!Context.hasSameType(SecondParamType, Context.getSizeType())) { | |||
15339 | Diag((*Param)->getSourceRange().getBegin(), | |||
15340 | diag::err_literal_operator_param) | |||
15341 | << SecondParamType << Context.getSizeType() | |||
15342 | << (*Param)->getSourceRange(); | |||
15343 | return true; | |||
15344 | } | |||
15345 | } else { | |||
15346 | Diag(FnDecl->getLocation(), diag::err_literal_operator_bad_param_count); | |||
15347 | return true; | |||
15348 | } | |||
15349 | ||||
15350 | // Parameters are good. | |||
15351 | ||||
15352 | // A parameter-declaration-clause containing a default argument is not | |||
15353 | // equivalent to any of the permitted forms. | |||
15354 | for (auto Param : FnDecl->parameters()) { | |||
15355 | if (Param->hasDefaultArg()) { | |||
15356 | Diag(Param->getDefaultArgRange().getBegin(), | |||
15357 | diag::err_literal_operator_default_argument) | |||
15358 | << Param->getDefaultArgRange(); | |||
15359 | break; | |||
15360 | } | |||
15361 | } | |||
15362 | ||||
15363 | StringRef LiteralName | |||
15364 | = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); | |||
15365 | if (LiteralName[0] != '_' && | |||
15366 | !getSourceManager().isInSystemHeader(FnDecl->getLocation())) { | |||
15367 | // C++11 [usrlit.suffix]p1: | |||
15368 | // Literal suffix identifiers that do not start with an underscore | |||
15369 | // are reserved for future standardization. | |||
15370 | Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved) | |||
15371 | << StringLiteralParser::isValidUDSuffix(getLangOpts(), LiteralName); | |||
15372 | } | |||
15373 | ||||
15374 | return false; | |||
15375 | } | |||
15376 | ||||
15377 | /// ActOnStartLinkageSpecification - Parsed the beginning of a C++ | |||
15378 | /// linkage specification, including the language and (if present) | |||
15379 | /// the '{'. ExternLoc is the location of the 'extern', Lang is the | |||
15380 | /// language string literal. LBraceLoc, if valid, provides the location of | |||
15381 | /// the '{' brace. Otherwise, this linkage specification does not | |||
15382 | /// have any braces. | |||
15383 | Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, | |||
15384 | Expr *LangStr, | |||
15385 | SourceLocation LBraceLoc) { | |||
15386 | StringLiteral *Lit = cast<StringLiteral>(LangStr); | |||
15387 | if (!Lit->isAscii()) { | |||
15388 | Diag(LangStr->getExprLoc(), diag::err_language_linkage_spec_not_ascii) | |||
15389 | << LangStr->getSourceRange(); | |||
15390 | return nullptr; | |||
15391 | } | |||
15392 | ||||
15393 | StringRef Lang = Lit->getString(); | |||
15394 | LinkageSpecDecl::LanguageIDs Language; | |||
15395 | if (Lang == "C") | |||
15396 | Language = LinkageSpecDecl::lang_c; | |||
15397 | else if (Lang == "C++") | |||
15398 | Language = LinkageSpecDecl::lang_cxx; | |||
15399 | else { | |||
15400 | Diag(LangStr->getExprLoc(), diag::err_language_linkage_spec_unknown) | |||
15401 | << LangStr->getSourceRange(); | |||
15402 | return nullptr; | |||
15403 | } | |||
15404 | ||||
15405 | // FIXME: Add all the various semantics of linkage specifications | |||
15406 | ||||
15407 | LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, ExternLoc, | |||
15408 | LangStr->getExprLoc(), Language, | |||
15409 | LBraceLoc.isValid()); | |||
15410 | CurContext->addDecl(D); | |||
15411 | PushDeclContext(S, D); | |||
15412 | return D; | |||
15413 | } | |||
15414 | ||||
15415 | /// ActOnFinishLinkageSpecification - Complete the definition of | |||
15416 | /// the C++ linkage specification LinkageSpec. If RBraceLoc is | |||
15417 | /// valid, it's the position of the closing '}' brace in a linkage | |||
15418 | /// specification that uses braces. | |||
15419 | Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, | |||
15420 | Decl *LinkageSpec, | |||
15421 | SourceLocation RBraceLoc) { | |||
15422 | if (RBraceLoc.isValid()) { | |||
15423 | LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); | |||
15424 | LSDecl->setRBraceLoc(RBraceLoc); | |||
15425 | } | |||
15426 | PopDeclContext(); | |||
15427 | return LinkageSpec; | |||
15428 | } | |||
15429 | ||||
15430 | Decl *Sema::ActOnEmptyDeclaration(Scope *S, | |||
15431 | const ParsedAttributesView &AttrList, | |||
15432 | SourceLocation SemiLoc) { | |||
15433 | Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc); | |||
15434 | // Attribute declarations appertain to empty declaration so we handle | |||
15435 | // them here. | |||
15436 | ProcessDeclAttributeList(S, ED, AttrList); | |||
15437 | ||||
15438 | CurContext->addDecl(ED); | |||
15439 | return ED; | |||
15440 | } | |||
15441 | ||||
15442 | /// Perform semantic analysis for the variable declaration that | |||
15443 | /// occurs within a C++ catch clause, returning the newly-created | |||
15444 | /// variable. | |||
15445 | VarDecl *Sema::BuildExceptionDeclaration(Scope *S, | |||
15446 | TypeSourceInfo *TInfo, | |||
15447 | SourceLocation StartLoc, | |||
15448 | SourceLocation Loc, | |||
15449 | IdentifierInfo *Name) { | |||
15450 | bool Invalid = false; | |||
15451 | QualType ExDeclType = TInfo->getType(); | |||
15452 | ||||
15453 | // Arrays and functions decay. | |||
15454 | if (ExDeclType->isArrayType()) | |||
15455 | ExDeclType = Context.getArrayDecayedType(ExDeclType); | |||
15456 | else if (ExDeclType->isFunctionType()) | |||
15457 | ExDeclType = Context.getPointerType(ExDeclType); | |||
15458 | ||||
15459 | // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. | |||
15460 | // The exception-declaration shall not denote a pointer or reference to an | |||
15461 | // incomplete type, other than [cv] void*. | |||
15462 | // N2844 forbids rvalue references. | |||
15463 | if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { | |||
15464 | Diag(Loc, diag::err_catch_rvalue_ref); | |||
15465 | Invalid = true; | |||
15466 | } | |||
15467 | ||||
15468 | if (ExDeclType->isVariablyModifiedType()) { | |||
15469 | Diag(Loc, diag::err_catch_variably_modified) << ExDeclType; | |||
15470 | Invalid = true; | |||
15471 | } | |||
15472 | ||||
15473 | QualType BaseType = ExDeclType; | |||
15474 | int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference | |||
15475 | unsigned DK = diag::err_catch_incomplete; | |||
15476 | if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { | |||
15477 | BaseType = Ptr->getPointeeType(); | |||
15478 | Mode = 1; | |||
15479 | DK = diag::err_catch_incomplete_ptr; | |||
15480 | } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { | |||
15481 | // For the purpose of error recovery, we treat rvalue refs like lvalue refs. | |||
15482 | BaseType = Ref->getPointeeType(); | |||
15483 | Mode = 2; | |||
15484 | DK = diag::err_catch_incomplete_ref; | |||
15485 | } | |||
15486 | if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && | |||
15487 | !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) | |||
15488 | Invalid = true; | |||
15489 | ||||
15490 | if (!Invalid && !ExDeclType->isDependentType() && | |||
15491 | RequireNonAbstractType(Loc, ExDeclType, | |||
15492 | diag::err_abstract_type_in_decl, | |||
15493 | AbstractVariableType)) | |||
15494 | Invalid = true; | |||
15495 | ||||
15496 | // Only the non-fragile NeXT runtime currently supports C++ catches | |||
15497 | // of ObjC types, and no runtime supports catching ObjC types by value. | |||
15498 | if (!Invalid && getLangOpts().ObjC) { | |||
15499 | QualType T = ExDeclType; | |||
15500 | if (const ReferenceType *RT = T->getAs<ReferenceType>()) | |||
15501 | T = RT->getPointeeType(); | |||
15502 | ||||
15503 | if (T->isObjCObjectType()) { | |||
15504 | Diag(Loc, diag::err_objc_object_catch); | |||
15505 | Invalid = true; | |||
15506 | } else if (T->isObjCObjectPointerType()) { | |||
15507 | // FIXME: should this be a test for macosx-fragile specifically? | |||
15508 | if (getLangOpts().ObjCRuntime.isFragile()) | |||
15509 | Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); | |||
15510 | } | |||
15511 | } | |||
15512 | ||||
15513 | VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, | |||
15514 | ExDeclType, TInfo, SC_None); | |||
15515 | ExDecl->setExceptionVariable(true); | |||
15516 | ||||
15517 | // In ARC, infer 'retaining' for variables of retainable type. | |||
15518 | if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) | |||
15519 | Invalid = true; | |||
15520 | ||||
15521 | if (!Invalid && !ExDeclType->isDependentType()) { | |||
15522 | if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { | |||
15523 | // Insulate this from anything else we might currently be parsing. | |||
15524 | EnterExpressionEvaluationContext scope( | |||
15525 | *this, ExpressionEvaluationContext::PotentiallyEvaluated); | |||
15526 | ||||
15527 | // C++ [except.handle]p16: | |||
15528 | // The object declared in an exception-declaration or, if the | |||
15529 | // exception-declaration does not specify a name, a temporary (12.2) is | |||
15530 | // copy-initialized (8.5) from the exception object. [...] | |||
15531 | // The object is destroyed when the handler exits, after the destruction | |||
15532 | // of any automatic objects initialized within the handler. | |||
15533 | // | |||
15534 | // We just pretend to initialize the object with itself, then make sure | |||
15535 | // it can be destroyed later. | |||
15536 | QualType initType = Context.getExceptionObjectType(ExDeclType); | |||
15537 | ||||
15538 | InitializedEntity entity = | |||
15539 | InitializedEntity::InitializeVariable(ExDecl); | |||
15540 | InitializationKind initKind = | |||
15541 | InitializationKind::CreateCopy(Loc, SourceLocation()); | |||
15542 | ||||
15543 | Expr *opaqueValue = | |||
15544 | new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); | |||
15545 | InitializationSequence sequence(*this, entity, initKind, opaqueValue); | |||
15546 | ExprResult result = sequence.Perform(*this, entity, initKind, opaqueValue); | |||
15547 | if (result.isInvalid()) | |||
15548 | Invalid = true; | |||
15549 | else { | |||
15550 | // If the constructor used was non-trivial, set this as the | |||
15551 | // "initializer". | |||
15552 | CXXConstructExpr *construct = result.getAs<CXXConstructExpr>(); | |||
15553 | if (!construct->getConstructor()->isTrivial()) { | |||
15554 | Expr *init = MaybeCreateExprWithCleanups(construct); | |||
15555 | ExDecl->setInit(init); | |||
15556 | } | |||
15557 | ||||
15558 | // And make sure it's destructable. | |||
15559 | FinalizeVarWithDestructor(ExDecl, recordType); | |||
15560 | } | |||
15561 | } | |||
15562 | } | |||
15563 | ||||
15564 | if (Invalid) | |||
15565 | ExDecl->setInvalidDecl(); | |||
15566 | ||||
15567 | return ExDecl; | |||
15568 | } | |||
15569 | ||||
15570 | /// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch | |||
15571 | /// handler. | |||
15572 | Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { | |||
15573 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); | |||
15574 | bool Invalid = D.isInvalidType(); | |||
15575 | ||||
15576 | // Check for unexpanded parameter packs. | |||
15577 | if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, | |||
15578 | UPPC_ExceptionType)) { | |||
15579 | TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, | |||
15580 | D.getIdentifierLoc()); | |||
15581 | Invalid = true; | |||
15582 | } | |||
15583 | ||||
15584 | IdentifierInfo *II = D.getIdentifier(); | |||
15585 | if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), | |||
15586 | LookupOrdinaryName, | |||
15587 | ForVisibleRedeclaration)) { | |||
15588 | // The scope should be freshly made just for us. There is just no way | |||
15589 | // it contains any previous declaration, except for function parameters in | |||
15590 | // a function-try-block's catch statement. | |||
15591 | assert(!S->isDeclScope(PrevDecl))((!S->isDeclScope(PrevDecl)) ? static_cast<void> (0) : __assert_fail ("!S->isDeclScope(PrevDecl)", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 15591, __PRETTY_FUNCTION__)); | |||
15592 | if (isDeclInScope(PrevDecl, CurContext, S)) { | |||
15593 | Diag(D.getIdentifierLoc(), diag::err_redefinition) | |||
15594 | << D.getIdentifier(); | |||
15595 | Diag(PrevDecl->getLocation(), diag::note_previous_definition); | |||
15596 | Invalid = true; | |||
15597 | } else if (PrevDecl->isTemplateParameter()) | |||
15598 | // Maybe we will complain about the shadowed template parameter. | |||
15599 | DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); | |||
15600 | } | |||
15601 | ||||
15602 | if (D.getCXXScopeSpec().isSet() && !Invalid) { | |||
15603 | Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) | |||
15604 | << D.getCXXScopeSpec().getRange(); | |||
15605 | Invalid = true; | |||
15606 | } | |||
15607 | ||||
15608 | VarDecl *ExDecl = BuildExceptionDeclaration( | |||
15609 | S, TInfo, D.getBeginLoc(), D.getIdentifierLoc(), D.getIdentifier()); | |||
15610 | if (Invalid) | |||
15611 | ExDecl->setInvalidDecl(); | |||
15612 | ||||
15613 | // Add the exception declaration into this scope. | |||
15614 | if (II) | |||
15615 | PushOnScopeChains(ExDecl, S); | |||
15616 | else | |||
15617 | CurContext->addDecl(ExDecl); | |||
15618 | ||||
15619 | ProcessDeclAttributes(S, ExDecl, D); | |||
15620 | return ExDecl; | |||
15621 | } | |||
15622 | ||||
15623 | Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, | |||
15624 | Expr *AssertExpr, | |||
15625 | Expr *AssertMessageExpr, | |||
15626 | SourceLocation RParenLoc) { | |||
15627 | StringLiteral *AssertMessage = | |||
15628 | AssertMessageExpr ? cast<StringLiteral>(AssertMessageExpr) : nullptr; | |||
15629 | ||||
15630 | if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) | |||
15631 | return nullptr; | |||
15632 | ||||
15633 | return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, | |||
15634 | AssertMessage, RParenLoc, false); | |||
15635 | } | |||
15636 | ||||
15637 | Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, | |||
15638 | Expr *AssertExpr, | |||
15639 | StringLiteral *AssertMessage, | |||
15640 | SourceLocation RParenLoc, | |||
15641 | bool Failed) { | |||
15642 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 15642, __PRETTY_FUNCTION__)); | |||
15643 | if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && | |||
15644 | !Failed) { | |||
15645 | // In a static_assert-declaration, the constant-expression shall be a | |||
15646 | // constant expression that can be contextually converted to bool. | |||
15647 | ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); | |||
15648 | if (Converted.isInvalid()) | |||
15649 | Failed = true; | |||
15650 | ||||
15651 | ExprResult FullAssertExpr = | |||
15652 | ActOnFinishFullExpr(Converted.get(), StaticAssertLoc, | |||
15653 | /*DiscardedValue*/ false, | |||
15654 | /*IsConstexpr*/ true); | |||
15655 | if (FullAssertExpr.isInvalid()) | |||
15656 | Failed = true; | |||
15657 | else | |||
15658 | AssertExpr = FullAssertExpr.get(); | |||
15659 | ||||
15660 | llvm::APSInt Cond; | |||
15661 | if (!Failed && VerifyIntegerConstantExpression(AssertExpr, &Cond, | |||
15662 | diag::err_static_assert_expression_is_not_constant, | |||
15663 | /*AllowFold=*/false).isInvalid()) | |||
15664 | Failed = true; | |||
15665 | ||||
15666 | if (!Failed && !Cond) { | |||
15667 | SmallString<256> MsgBuffer; | |||
15668 | llvm::raw_svector_ostream Msg(MsgBuffer); | |||
15669 | if (AssertMessage) | |||
15670 | AssertMessage->printPretty(Msg, nullptr, getPrintingPolicy()); | |||
15671 | ||||
15672 | Expr *InnerCond = nullptr; | |||
15673 | std::string InnerCondDescription; | |||
15674 | std::tie(InnerCond, InnerCondDescription) = | |||
15675 | findFailedBooleanCondition(Converted.get()); | |||
15676 | if (InnerCond && isa<ConceptSpecializationExpr>(InnerCond)) { | |||
15677 | // Drill down into concept specialization expressions to see why they | |||
15678 | // weren't satisfied. | |||
15679 | Diag(StaticAssertLoc, diag::err_static_assert_failed) | |||
15680 | << !AssertMessage << Msg.str() << AssertExpr->getSourceRange(); | |||
15681 | ConstraintSatisfaction Satisfaction; | |||
15682 | if (!CheckConstraintSatisfaction(InnerCond, Satisfaction)) | |||
15683 | DiagnoseUnsatisfiedConstraint(Satisfaction); | |||
15684 | } else if (InnerCond && !isa<CXXBoolLiteralExpr>(InnerCond) | |||
15685 | && !isa<IntegerLiteral>(InnerCond)) { | |||
15686 | Diag(StaticAssertLoc, diag::err_static_assert_requirement_failed) | |||
15687 | << InnerCondDescription << !AssertMessage | |||
15688 | << Msg.str() << InnerCond->getSourceRange(); | |||
15689 | } else { | |||
15690 | Diag(StaticAssertLoc, diag::err_static_assert_failed) | |||
15691 | << !AssertMessage << Msg.str() << AssertExpr->getSourceRange(); | |||
15692 | } | |||
15693 | Failed = true; | |||
15694 | } | |||
15695 | } else { | |||
15696 | ExprResult FullAssertExpr = ActOnFinishFullExpr(AssertExpr, StaticAssertLoc, | |||
15697 | /*DiscardedValue*/false, | |||
15698 | /*IsConstexpr*/true); | |||
15699 | if (FullAssertExpr.isInvalid()) | |||
15700 | Failed = true; | |||
15701 | else | |||
15702 | AssertExpr = FullAssertExpr.get(); | |||
15703 | } | |||
15704 | ||||
15705 | Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, | |||
15706 | AssertExpr, AssertMessage, RParenLoc, | |||
15707 | Failed); | |||
15708 | ||||
15709 | CurContext->addDecl(Decl); | |||
15710 | return Decl; | |||
15711 | } | |||
15712 | ||||
15713 | /// Perform semantic analysis of the given friend type declaration. | |||
15714 | /// | |||
15715 | /// \returns A friend declaration that. | |||
15716 | FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, | |||
15717 | SourceLocation FriendLoc, | |||
15718 | TypeSourceInfo *TSInfo) { | |||
15719 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 15719, __PRETTY_FUNCTION__)); | |||
15720 | ||||
15721 | QualType T = TSInfo->getType(); | |||
15722 | SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); | |||
15723 | ||||
15724 | // C++03 [class.friend]p2: | |||
15725 | // An elaborated-type-specifier shall be used in a friend declaration | |||
15726 | // for a class.* | |||
15727 | // | |||
15728 | // * The class-key of the elaborated-type-specifier is required. | |||
15729 | if (!CodeSynthesisContexts.empty()) { | |||
15730 | // Do not complain about the form of friend template types during any kind | |||
15731 | // of code synthesis. For template instantiation, we will have complained | |||
15732 | // when the template was defined. | |||
15733 | } else { | |||
15734 | if (!T->isElaboratedTypeSpecifier()) { | |||
15735 | // If we evaluated the type to a record type, suggest putting | |||
15736 | // a tag in front. | |||
15737 | if (const RecordType *RT = T->getAs<RecordType>()) { | |||
15738 | RecordDecl *RD = RT->getDecl(); | |||
15739 | ||||
15740 | SmallString<16> InsertionText(" "); | |||
15741 | InsertionText += RD->getKindName(); | |||
15742 | ||||
15743 | Diag(TypeRange.getBegin(), | |||
15744 | getLangOpts().CPlusPlus11 ? | |||
15745 | diag::warn_cxx98_compat_unelaborated_friend_type : | |||
15746 | diag::ext_unelaborated_friend_type) | |||
15747 | << (unsigned) RD->getTagKind() | |||
15748 | << T | |||
15749 | << FixItHint::CreateInsertion(getLocForEndOfToken(FriendLoc), | |||
15750 | InsertionText); | |||
15751 | } else { | |||
15752 | Diag(FriendLoc, | |||
15753 | getLangOpts().CPlusPlus11 ? | |||
15754 | diag::warn_cxx98_compat_nonclass_type_friend : | |||
15755 | diag::ext_nonclass_type_friend) | |||
15756 | << T | |||
15757 | << TypeRange; | |||
15758 | } | |||
15759 | } else if (T->getAs<EnumType>()) { | |||
15760 | Diag(FriendLoc, | |||
15761 | getLangOpts().CPlusPlus11 ? | |||
15762 | diag::warn_cxx98_compat_enum_friend : | |||
15763 | diag::ext_enum_friend) | |||
15764 | << T | |||
15765 | << TypeRange; | |||
15766 | } | |||
15767 | ||||
15768 | // C++11 [class.friend]p3: | |||
15769 | // A friend declaration that does not declare a function shall have one | |||
15770 | // of the following forms: | |||
15771 | // friend elaborated-type-specifier ; | |||
15772 | // friend simple-type-specifier ; | |||
15773 | // friend typename-specifier ; | |||
15774 | if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc) | |||
15775 | Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; | |||
15776 | } | |||
15777 | ||||
15778 | // If the type specifier in a friend declaration designates a (possibly | |||
15779 | // cv-qualified) class type, that class is declared as a friend; otherwise, | |||
15780 | // the friend declaration is ignored. | |||
15781 | return FriendDecl::Create(Context, CurContext, | |||
15782 | TSInfo->getTypeLoc().getBeginLoc(), TSInfo, | |||
15783 | FriendLoc); | |||
15784 | } | |||
15785 | ||||
15786 | /// Handle a friend tag declaration where the scope specifier was | |||
15787 | /// templated. | |||
15788 | Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, | |||
15789 | unsigned TagSpec, SourceLocation TagLoc, | |||
15790 | CXXScopeSpec &SS, IdentifierInfo *Name, | |||
15791 | SourceLocation NameLoc, | |||
15792 | const ParsedAttributesView &Attr, | |||
15793 | MultiTemplateParamsArg TempParamLists) { | |||
15794 | TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); | |||
15795 | ||||
15796 | bool IsMemberSpecialization = false; | |||
15797 | bool Invalid = false; | |||
15798 | ||||
15799 | if (TemplateParameterList *TemplateParams = | |||
15800 | MatchTemplateParametersToScopeSpecifier( | |||
15801 | TagLoc, NameLoc, SS, nullptr, TempParamLists, /*friend*/ true, | |||
15802 | IsMemberSpecialization, Invalid)) { | |||
15803 | if (TemplateParams->size() > 0) { | |||
15804 | // This is a declaration of a class template. | |||
15805 | if (Invalid) | |||
15806 | return nullptr; | |||
15807 | ||||
15808 | return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, SS, Name, | |||
15809 | NameLoc, Attr, TemplateParams, AS_public, | |||
15810 | /*ModulePrivateLoc=*/SourceLocation(), | |||
15811 | FriendLoc, TempParamLists.size() - 1, | |||
15812 | TempParamLists.data()).get(); | |||
15813 | } else { | |||
15814 | // The "template<>" header is extraneous. | |||
15815 | Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) | |||
15816 | << TypeWithKeyword::getTagTypeKindName(Kind) << Name; | |||
15817 | IsMemberSpecialization = true; | |||
15818 | } | |||
15819 | } | |||
15820 | ||||
15821 | if (Invalid) return nullptr; | |||
15822 | ||||
15823 | bool isAllExplicitSpecializations = true; | |||
15824 | for (unsigned I = TempParamLists.size(); I-- > 0; ) { | |||
15825 | if (TempParamLists[I]->size()) { | |||
15826 | isAllExplicitSpecializations = false; | |||
15827 | break; | |||
15828 | } | |||
15829 | } | |||
15830 | ||||
15831 | // FIXME: don't ignore attributes. | |||
15832 | ||||
15833 | // If it's explicit specializations all the way down, just forget | |||
15834 | // about the template header and build an appropriate non-templated | |||
15835 | // friend. TODO: for source fidelity, remember the headers. | |||
15836 | if (isAllExplicitSpecializations) { | |||
15837 | if (SS.isEmpty()) { | |||
15838 | bool Owned = false; | |||
15839 | bool IsDependent = false; | |||
15840 | return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, | |||
15841 | Attr, AS_public, | |||
15842 | /*ModulePrivateLoc=*/SourceLocation(), | |||
15843 | MultiTemplateParamsArg(), Owned, IsDependent, | |||
15844 | /*ScopedEnumKWLoc=*/SourceLocation(), | |||
15845 | /*ScopedEnumUsesClassTag=*/false, | |||
15846 | /*UnderlyingType=*/TypeResult(), | |||
15847 | /*IsTypeSpecifier=*/false, | |||
15848 | /*IsTemplateParamOrArg=*/false); | |||
15849 | } | |||
15850 | ||||
15851 | NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); | |||
15852 | ElaboratedTypeKeyword Keyword | |||
15853 | = TypeWithKeyword::getKeywordForTagTypeKind(Kind); | |||
15854 | QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, | |||
15855 | *Name, NameLoc); | |||
15856 | if (T.isNull()) | |||
15857 | return nullptr; | |||
15858 | ||||
15859 | TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); | |||
15860 | if (isa<DependentNameType>(T)) { | |||
15861 | DependentNameTypeLoc TL = | |||
15862 | TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); | |||
15863 | TL.setElaboratedKeywordLoc(TagLoc); | |||
15864 | TL.setQualifierLoc(QualifierLoc); | |||
15865 | TL.setNameLoc(NameLoc); | |||
15866 | } else { | |||
15867 | ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>(); | |||
15868 | TL.setElaboratedKeywordLoc(TagLoc); | |||
15869 | TL.setQualifierLoc(QualifierLoc); | |||
15870 | TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc); | |||
15871 | } | |||
15872 | ||||
15873 | FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, | |||
15874 | TSI, FriendLoc, TempParamLists); | |||
15875 | Friend->setAccess(AS_public); | |||
15876 | CurContext->addDecl(Friend); | |||
15877 | return Friend; | |||
15878 | } | |||
15879 | ||||
15880 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 15880, __PRETTY_FUNCTION__)); | |||
15881 | ||||
15882 | ||||
15883 | ||||
15884 | // Handle the case of a templated-scope friend class. e.g. | |||
15885 | // template <class T> class A<T>::B; | |||
15886 | // FIXME: we don't support these right now. | |||
15887 | Diag(NameLoc, diag::warn_template_qualified_friend_unsupported) | |||
15888 | << SS.getScopeRep() << SS.getRange() << cast<CXXRecordDecl>(CurContext); | |||
15889 | ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); | |||
15890 | QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); | |||
15891 | TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); | |||
15892 | DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); | |||
15893 | TL.setElaboratedKeywordLoc(TagLoc); | |||
15894 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); | |||
15895 | TL.setNameLoc(NameLoc); | |||
15896 | ||||
15897 | FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, | |||
15898 | TSI, FriendLoc, TempParamLists); | |||
15899 | Friend->setAccess(AS_public); | |||
15900 | Friend->setUnsupportedFriend(true); | |||
15901 | CurContext->addDecl(Friend); | |||
15902 | return Friend; | |||
15903 | } | |||
15904 | ||||
15905 | /// Handle a friend type declaration. This works in tandem with | |||
15906 | /// ActOnTag. | |||
15907 | /// | |||
15908 | /// Notes on friend class templates: | |||
15909 | /// | |||
15910 | /// We generally treat friend class declarations as if they were | |||
15911 | /// declaring a class. So, for example, the elaborated type specifier | |||
15912 | /// in a friend declaration is required to obey the restrictions of a | |||
15913 | /// class-head (i.e. no typedefs in the scope chain), template | |||
15914 | /// parameters are required to match up with simple template-ids, &c. | |||
15915 | /// However, unlike when declaring a template specialization, it's | |||
15916 | /// okay to refer to a template specialization without an empty | |||
15917 | /// template parameter declaration, e.g. | |||
15918 | /// friend class A<T>::B<unsigned>; | |||
15919 | /// We permit this as a special case; if there are any template | |||
15920 | /// parameters present at all, require proper matching, i.e. | |||
15921 | /// template <> template \<class T> friend class A<int>::B; | |||
15922 | Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, | |||
15923 | MultiTemplateParamsArg TempParams) { | |||
15924 | SourceLocation Loc = DS.getBeginLoc(); | |||
15925 | ||||
15926 | assert(DS.isFriendSpecified())((DS.isFriendSpecified()) ? static_cast<void> (0) : __assert_fail ("DS.isFriendSpecified()", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 15926, __PRETTY_FUNCTION__)); | |||
15927 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 15927, __PRETTY_FUNCTION__)); | |||
15928 | ||||
15929 | // C++ [class.friend]p3: | |||
15930 | // A friend declaration that does not declare a function shall have one of | |||
15931 | // the following forms: | |||
15932 | // friend elaborated-type-specifier ; | |||
15933 | // friend simple-type-specifier ; | |||
15934 | // friend typename-specifier ; | |||
15935 | // | |||
15936 | // Any declaration with a type qualifier does not have that form. (It's | |||
15937 | // legal to specify a qualified type as a friend, you just can't write the | |||
15938 | // keywords.) | |||
15939 | if (DS.getTypeQualifiers()) { | |||
15940 | if (DS.getTypeQualifiers() & DeclSpec::TQ_const) | |||
15941 | Diag(DS.getConstSpecLoc(), diag::err_friend_decl_spec) << "const"; | |||
15942 | if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) | |||
15943 | Diag(DS.getVolatileSpecLoc(), diag::err_friend_decl_spec) << "volatile"; | |||
15944 | if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) | |||
15945 | Diag(DS.getRestrictSpecLoc(), diag::err_friend_decl_spec) << "restrict"; | |||
15946 | if (DS.getTypeQualifiers() & DeclSpec::TQ_atomic) | |||
15947 | Diag(DS.getAtomicSpecLoc(), diag::err_friend_decl_spec) << "_Atomic"; | |||
15948 | if (DS.getTypeQualifiers() & DeclSpec::TQ_unaligned) | |||
15949 | Diag(DS.getUnalignedSpecLoc(), diag::err_friend_decl_spec) << "__unaligned"; | |||
15950 | } | |||
15951 | ||||
15952 | // Try to convert the decl specifier to a type. This works for | |||
15953 | // friend templates because ActOnTag never produces a ClassTemplateDecl | |||
15954 | // for a TUK_Friend. | |||
15955 | Declarator TheDeclarator(DS, DeclaratorContext::MemberContext); | |||
15956 | TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); | |||
15957 | QualType T = TSI->getType(); | |||
15958 | if (TheDeclarator.isInvalidType()) | |||
15959 | return nullptr; | |||
15960 | ||||
15961 | if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) | |||
15962 | return nullptr; | |||
15963 | ||||
15964 | // This is definitely an error in C++98. It's probably meant to | |||
15965 | // be forbidden in C++0x, too, but the specification is just | |||
15966 | // poorly written. | |||
15967 | // | |||
15968 | // The problem is with declarations like the following: | |||
15969 | // template <T> friend A<T>::foo; | |||
15970 | // where deciding whether a class C is a friend or not now hinges | |||
15971 | // on whether there exists an instantiation of A that causes | |||
15972 | // 'foo' to equal C. There are restrictions on class-heads | |||
15973 | // (which we declare (by fiat) elaborated friend declarations to | |||
15974 | // be) that makes this tractable. | |||
15975 | // | |||
15976 | // FIXME: handle "template <> friend class A<T>;", which | |||
15977 | // is possibly well-formed? Who even knows? | |||
15978 | if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { | |||
15979 | Diag(Loc, diag::err_tagless_friend_type_template) | |||
15980 | << DS.getSourceRange(); | |||
15981 | return nullptr; | |||
15982 | } | |||
15983 | ||||
15984 | // C++98 [class.friend]p1: A friend of a class is a function | |||
15985 | // or class that is not a member of the class . . . | |||
15986 | // This is fixed in DR77, which just barely didn't make the C++03 | |||
15987 | // deadline. It's also a very silly restriction that seriously | |||
15988 | // affects inner classes and which nobody else seems to implement; | |||
15989 | // thus we never diagnose it, not even in -pedantic. | |||
15990 | // | |||
15991 | // But note that we could warn about it: it's always useless to | |||
15992 | // friend one of your own members (it's not, however, worthless to | |||
15993 | // friend a member of an arbitrary specialization of your template). | |||
15994 | ||||
15995 | Decl *D; | |||
15996 | if (!TempParams.empty()) | |||
15997 | D = FriendTemplateDecl::Create(Context, CurContext, Loc, | |||
15998 | TempParams, | |||
15999 | TSI, | |||
16000 | DS.getFriendSpecLoc()); | |||
16001 | else | |||
16002 | D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); | |||
16003 | ||||
16004 | if (!D) | |||
16005 | return nullptr; | |||
16006 | ||||
16007 | D->setAccess(AS_public); | |||
16008 | CurContext->addDecl(D); | |||
16009 | ||||
16010 | return D; | |||
16011 | } | |||
16012 | ||||
16013 | NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, | |||
16014 | MultiTemplateParamsArg TemplateParams) { | |||
16015 | const DeclSpec &DS = D.getDeclSpec(); | |||
16016 | ||||
16017 | assert(DS.isFriendSpecified())((DS.isFriendSpecified()) ? static_cast<void> (0) : __assert_fail ("DS.isFriendSpecified()", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 16017, __PRETTY_FUNCTION__)); | |||
16018 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 16018, __PRETTY_FUNCTION__)); | |||
16019 | ||||
16020 | SourceLocation Loc = D.getIdentifierLoc(); | |||
16021 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); | |||
16022 | ||||
16023 | // C++ [class.friend]p1 | |||
16024 | // A friend of a class is a function or class.... | |||
16025 | // Note that this sees through typedefs, which is intended. | |||
16026 | // It *doesn't* see through dependent types, which is correct | |||
16027 | // according to [temp.arg.type]p3: | |||
16028 | // If a declaration acquires a function type through a | |||
16029 | // type dependent on a template-parameter and this causes | |||
16030 | // a declaration that does not use the syntactic form of a | |||
16031 | // function declarator to have a function type, the program | |||
16032 | // is ill-formed. | |||
16033 | if (!TInfo->getType()->isFunctionType()) { | |||
16034 | Diag(Loc, diag::err_unexpected_friend); | |||
16035 | ||||
16036 | // It might be worthwhile to try to recover by creating an | |||
16037 | // appropriate declaration. | |||
16038 | return nullptr; | |||
16039 | } | |||
16040 | ||||
16041 | // C++ [namespace.memdef]p3 | |||
16042 | // - If a friend declaration in a non-local class first declares a | |||
16043 | // class or function, the friend class or function is a member | |||
16044 | // of the innermost enclosing namespace. | |||
16045 | // - The name of the friend is not found by simple name lookup | |||
16046 | // until a matching declaration is provided in that namespace | |||
16047 | // scope (either before or after the class declaration granting | |||
16048 | // friendship). | |||
16049 | // - If a friend function is called, its name may be found by the | |||
16050 | // name lookup that considers functions from namespaces and | |||
16051 | // classes associated with the types of the function arguments. | |||
16052 | // - When looking for a prior declaration of a class or a function | |||
16053 | // declared as a friend, scopes outside the innermost enclosing | |||
16054 | // namespace scope are not considered. | |||
16055 | ||||
16056 | CXXScopeSpec &SS = D.getCXXScopeSpec(); | |||
16057 | DeclarationNameInfo NameInfo = GetNameForDeclarator(D); | |||
16058 | assert(NameInfo.getName())((NameInfo.getName()) ? static_cast<void> (0) : __assert_fail ("NameInfo.getName()", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 16058, __PRETTY_FUNCTION__)); | |||
16059 | ||||
16060 | // Check for unexpanded parameter packs. | |||
16061 | if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || | |||
16062 | DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || | |||
16063 | DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) | |||
16064 | return nullptr; | |||
16065 | ||||
16066 | // The context we found the declaration in, or in which we should | |||
16067 | // create the declaration. | |||
16068 | DeclContext *DC; | |||
16069 | Scope *DCScope = S; | |||
16070 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, | |||
16071 | ForExternalRedeclaration); | |||
16072 | ||||
16073 | // There are five cases here. | |||
16074 | // - There's no scope specifier and we're in a local class. Only look | |||
16075 | // for functions declared in the immediately-enclosing block scope. | |||
16076 | // We recover from invalid scope qualifiers as if they just weren't there. | |||
16077 | FunctionDecl *FunctionContainingLocalClass = nullptr; | |||
16078 | if ((SS.isInvalid() || !SS.isSet()) && | |||
16079 | (FunctionContainingLocalClass = | |||
16080 | cast<CXXRecordDecl>(CurContext)->isLocalClass())) { | |||
16081 | // C++11 [class.friend]p11: | |||
16082 | // If a friend declaration appears in a local class and the name | |||
16083 | // specified is an unqualified name, a prior declaration is | |||
16084 | // looked up without considering scopes that are outside the | |||
16085 | // innermost enclosing non-class scope. For a friend function | |||
16086 | // declaration, if there is no prior declaration, the program is | |||
16087 | // ill-formed. | |||
16088 | ||||
16089 | // Find the innermost enclosing non-class scope. This is the block | |||
16090 | // scope containing the local class definition (or for a nested class, | |||
16091 | // the outer local class). | |||
16092 | DCScope = S->getFnParent(); | |||
16093 | ||||
16094 | // Look up the function name in the scope. | |||
16095 | Previous.clear(LookupLocalFriendName); | |||
16096 | LookupName(Previous, S, /*AllowBuiltinCreation*/false); | |||
16097 | ||||
16098 | if (!Previous.empty()) { | |||
16099 | // All possible previous declarations must have the same context: | |||
16100 | // either they were declared at block scope or they are members of | |||
16101 | // one of the enclosing local classes. | |||
16102 | DC = Previous.getRepresentativeDecl()->getDeclContext(); | |||
16103 | } else { | |||
16104 | // This is ill-formed, but provide the context that we would have | |||
16105 | // declared the function in, if we were permitted to, for error recovery. | |||
16106 | DC = FunctionContainingLocalClass; | |||
16107 | } | |||
16108 | adjustContextForLocalExternDecl(DC); | |||
16109 | ||||
16110 | // C++ [class.friend]p6: | |||
16111 | // A function can be defined in a friend declaration of a class if and | |||
16112 | // only if the class is a non-local class (9.8), the function name is | |||
16113 | // unqualified, and the function has namespace scope. | |||
16114 | if (D.isFunctionDefinition()) { | |||
16115 | Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); | |||
16116 | } | |||
16117 | ||||
16118 | // - There's no scope specifier, in which case we just go to the | |||
16119 | // appropriate scope and look for a function or function template | |||
16120 | // there as appropriate. | |||
16121 | } else if (SS.isInvalid() || !SS.isSet()) { | |||
16122 | // C++11 [namespace.memdef]p3: | |||
16123 | // If the name in a friend declaration is neither qualified nor | |||
16124 | // a template-id and the declaration is a function or an | |||
16125 | // elaborated-type-specifier, the lookup to determine whether | |||
16126 | // the entity has been previously declared shall not consider | |||
16127 | // any scopes outside the innermost enclosing namespace. | |||
16128 | bool isTemplateId = | |||
16129 | D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId; | |||
16130 | ||||
16131 | // Find the appropriate context according to the above. | |||
16132 | DC = CurContext; | |||
16133 | ||||
16134 | // Skip class contexts. If someone can cite chapter and verse | |||
16135 | // for this behavior, that would be nice --- it's what GCC and | |||
16136 | // EDG do, and it seems like a reasonable intent, but the spec | |||
16137 | // really only says that checks for unqualified existing | |||
16138 | // declarations should stop at the nearest enclosing namespace, | |||
16139 | // not that they should only consider the nearest enclosing | |||
16140 | // namespace. | |||
16141 | while (DC->isRecord()) | |||
16142 | DC = DC->getParent(); | |||
16143 | ||||
16144 | DeclContext *LookupDC = DC; | |||
16145 | while (LookupDC->isTransparentContext()) | |||
16146 | LookupDC = LookupDC->getParent(); | |||
16147 | ||||
16148 | while (true) { | |||
16149 | LookupQualifiedName(Previous, LookupDC); | |||
16150 | ||||
16151 | if (!Previous.empty()) { | |||
16152 | DC = LookupDC; | |||
16153 | break; | |||
16154 | } | |||
16155 | ||||
16156 | if (isTemplateId) { | |||
16157 | if (isa<TranslationUnitDecl>(LookupDC)) break; | |||
16158 | } else { | |||
16159 | if (LookupDC->isFileContext()) break; | |||
16160 | } | |||
16161 | LookupDC = LookupDC->getParent(); | |||
16162 | } | |||
16163 | ||||
16164 | DCScope = getScopeForDeclContext(S, DC); | |||
16165 | ||||
16166 | // - There's a non-dependent scope specifier, in which case we | |||
16167 | // compute it and do a previous lookup there for a function | |||
16168 | // or function template. | |||
16169 | } else if (!SS.getScopeRep()->isDependent()) { | |||
16170 | DC = computeDeclContext(SS); | |||
16171 | if (!DC) return nullptr; | |||
16172 | ||||
16173 | if (RequireCompleteDeclContext(SS, DC)) return nullptr; | |||
16174 | ||||
16175 | LookupQualifiedName(Previous, DC); | |||
16176 | ||||
16177 | // C++ [class.friend]p1: A friend of a class is a function or | |||
16178 | // class that is not a member of the class . . . | |||
16179 | if (DC->Equals(CurContext)) | |||
16180 | Diag(DS.getFriendSpecLoc(), | |||
16181 | getLangOpts().CPlusPlus11 ? | |||
16182 | diag::warn_cxx98_compat_friend_is_member : | |||
16183 | diag::err_friend_is_member); | |||
16184 | ||||
16185 | if (D.isFunctionDefinition()) { | |||
16186 | // C++ [class.friend]p6: | |||
16187 | // A function can be defined in a friend declaration of a class if and | |||
16188 | // only if the class is a non-local class (9.8), the function name is | |||
16189 | // unqualified, and the function has namespace scope. | |||
16190 | // | |||
16191 | // FIXME: We should only do this if the scope specifier names the | |||
16192 | // innermost enclosing namespace; otherwise the fixit changes the | |||
16193 | // meaning of the code. | |||
16194 | SemaDiagnosticBuilder DB | |||
16195 | = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); | |||
16196 | ||||
16197 | DB << SS.getScopeRep(); | |||
16198 | if (DC->isFileContext()) | |||
16199 | DB << FixItHint::CreateRemoval(SS.getRange()); | |||
16200 | SS.clear(); | |||
16201 | } | |||
16202 | ||||
16203 | // - There's a scope specifier that does not match any template | |||
16204 | // parameter lists, in which case we use some arbitrary context, | |||
16205 | // create a method or method template, and wait for instantiation. | |||
16206 | // - There's a scope specifier that does match some template | |||
16207 | // parameter lists, which we don't handle right now. | |||
16208 | } else { | |||
16209 | if (D.isFunctionDefinition()) { | |||
16210 | // C++ [class.friend]p6: | |||
16211 | // A function can be defined in a friend declaration of a class if and | |||
16212 | // only if the class is a non-local class (9.8), the function name is | |||
16213 | // unqualified, and the function has namespace scope. | |||
16214 | Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) | |||
16215 | << SS.getScopeRep(); | |||
16216 | } | |||
16217 | ||||
16218 | DC = CurContext; | |||
16219 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 16219, __PRETTY_FUNCTION__)); | |||
16220 | } | |||
16221 | ||||
16222 | if (!DC->isRecord()) { | |||
16223 | int DiagArg = -1; | |||
16224 | switch (D.getName().getKind()) { | |||
16225 | case UnqualifiedIdKind::IK_ConstructorTemplateId: | |||
16226 | case UnqualifiedIdKind::IK_ConstructorName: | |||
16227 | DiagArg = 0; | |||
16228 | break; | |||
16229 | case UnqualifiedIdKind::IK_DestructorName: | |||
16230 | DiagArg = 1; | |||
16231 | break; | |||
16232 | case UnqualifiedIdKind::IK_ConversionFunctionId: | |||
16233 | DiagArg = 2; | |||
16234 | break; | |||
16235 | case UnqualifiedIdKind::IK_DeductionGuideName: | |||
16236 | DiagArg = 3; | |||
16237 | break; | |||
16238 | case UnqualifiedIdKind::IK_Identifier: | |||
16239 | case UnqualifiedIdKind::IK_ImplicitSelfParam: | |||
16240 | case UnqualifiedIdKind::IK_LiteralOperatorId: | |||
16241 | case UnqualifiedIdKind::IK_OperatorFunctionId: | |||
16242 | case UnqualifiedIdKind::IK_TemplateId: | |||
16243 | break; | |||
16244 | } | |||
16245 | // This implies that it has to be an operator or function. | |||
16246 | if (DiagArg >= 0) { | |||
16247 | Diag(Loc, diag::err_introducing_special_friend) << DiagArg; | |||
16248 | return nullptr; | |||
16249 | } | |||
16250 | } | |||
16251 | ||||
16252 | // FIXME: This is an egregious hack to cope with cases where the scope stack | |||
16253 | // does not contain the declaration context, i.e., in an out-of-line | |||
16254 | // definition of a class. | |||
16255 | Scope FakeDCScope(S, Scope::DeclScope, Diags); | |||
16256 | if (!DCScope) { | |||
16257 | FakeDCScope.setEntity(DC); | |||
16258 | DCScope = &FakeDCScope; | |||
16259 | } | |||
16260 | ||||
16261 | bool AddToScope = true; | |||
16262 | NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, | |||
16263 | TemplateParams, AddToScope); | |||
16264 | if (!ND) return nullptr; | |||
16265 | ||||
16266 | assert(ND->getLexicalDeclContext() == CurContext)((ND->getLexicalDeclContext() == CurContext) ? static_cast <void> (0) : __assert_fail ("ND->getLexicalDeclContext() == CurContext" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 16266, __PRETTY_FUNCTION__)); | |||
16267 | ||||
16268 | // If we performed typo correction, we might have added a scope specifier | |||
16269 | // and changed the decl context. | |||
16270 | DC = ND->getDeclContext(); | |||
16271 | ||||
16272 | // Add the function declaration to the appropriate lookup tables, | |||
16273 | // adjusting the redeclarations list as necessary. We don't | |||
16274 | // want to do this yet if the friending class is dependent. | |||
16275 | // | |||
16276 | // Also update the scope-based lookup if the target context's | |||
16277 | // lookup context is in lexical scope. | |||
16278 | if (!CurContext->isDependentContext()) { | |||
16279 | DC = DC->getRedeclContext(); | |||
16280 | DC->makeDeclVisibleInContext(ND); | |||
16281 | if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) | |||
16282 | PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); | |||
16283 | } | |||
16284 | ||||
16285 | FriendDecl *FrD = FriendDecl::Create(Context, CurContext, | |||
16286 | D.getIdentifierLoc(), ND, | |||
16287 | DS.getFriendSpecLoc()); | |||
16288 | FrD->setAccess(AS_public); | |||
16289 | CurContext->addDecl(FrD); | |||
16290 | ||||
16291 | if (ND->isInvalidDecl()) { | |||
16292 | FrD->setInvalidDecl(); | |||
16293 | } else { | |||
16294 | if (DC->isRecord()) CheckFriendAccess(ND); | |||
16295 | ||||
16296 | FunctionDecl *FD; | |||
16297 | if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) | |||
16298 | FD = FTD->getTemplatedDecl(); | |||
16299 | else | |||
16300 | FD = cast<FunctionDecl>(ND); | |||
16301 | ||||
16302 | // C++11 [dcl.fct.default]p4: If a friend declaration specifies a | |||
16303 | // default argument expression, that declaration shall be a definition | |||
16304 | // and shall be the only declaration of the function or function | |||
16305 | // template in the translation unit. | |||
16306 | if (functionDeclHasDefaultArgument(FD)) { | |||
16307 | // We can't look at FD->getPreviousDecl() because it may not have been set | |||
16308 | // if we're in a dependent context. If the function is known to be a | |||
16309 | // redeclaration, we will have narrowed Previous down to the right decl. | |||
16310 | if (D.isRedeclaration()) { | |||
16311 | Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_redeclared); | |||
16312 | Diag(Previous.getRepresentativeDecl()->getLocation(), | |||
16313 | diag::note_previous_declaration); | |||
16314 | } else if (!D.isFunctionDefinition()) | |||
16315 | Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_must_be_def); | |||
16316 | } | |||
16317 | ||||
16318 | // Mark templated-scope function declarations as unsupported. | |||
16319 | if (FD->getNumTemplateParameterLists() && SS.isValid()) { | |||
16320 | Diag(FD->getLocation(), diag::warn_template_qualified_friend_unsupported) | |||
16321 | << SS.getScopeRep() << SS.getRange() | |||
16322 | << cast<CXXRecordDecl>(CurContext); | |||
16323 | FrD->setUnsupportedFriend(true); | |||
16324 | } | |||
16325 | } | |||
16326 | ||||
16327 | return ND; | |||
16328 | } | |||
16329 | ||||
16330 | void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { | |||
16331 | AdjustDeclIfTemplate(Dcl); | |||
16332 | ||||
16333 | FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl); | |||
16334 | if (!Fn) { | |||
16335 | Diag(DelLoc, diag::err_deleted_non_function); | |||
16336 | return; | |||
16337 | } | |||
16338 | ||||
16339 | // Deleted function does not have a body. | |||
16340 | Fn->setWillHaveBody(false); | |||
16341 | ||||
16342 | if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { | |||
16343 | // Don't consider the implicit declaration we generate for explicit | |||
16344 | // specializations. FIXME: Do not generate these implicit declarations. | |||
16345 | if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization || | |||
16346 | Prev->getPreviousDecl()) && | |||
16347 | !Prev->isDefined()) { | |||
16348 | Diag(DelLoc, diag::err_deleted_decl_not_first); | |||
16349 | Diag(Prev->getLocation().isInvalid() ? DelLoc : Prev->getLocation(), | |||
16350 | Prev->isImplicit() ? diag::note_previous_implicit_declaration | |||
16351 | : diag::note_previous_declaration); | |||
16352 | } | |||
16353 | // If the declaration wasn't the first, we delete the function anyway for | |||
16354 | // recovery. | |||
16355 | Fn = Fn->getCanonicalDecl(); | |||
16356 | } | |||
16357 | ||||
16358 | // dllimport/dllexport cannot be deleted. | |||
16359 | if (const InheritableAttr *DLLAttr = getDLLAttr(Fn)) { | |||
16360 | Diag(Fn->getLocation(), diag::err_attribute_dll_deleted) << DLLAttr; | |||
16361 | Fn->setInvalidDecl(); | |||
16362 | } | |||
16363 | ||||
16364 | if (Fn->isDeleted()) | |||
16365 | return; | |||
16366 | ||||
16367 | // C++11 [basic.start.main]p3: | |||
16368 | // A program that defines main as deleted [...] is ill-formed. | |||
16369 | if (Fn->isMain()) | |||
16370 | Diag(DelLoc, diag::err_deleted_main); | |||
16371 | ||||
16372 | // C++11 [dcl.fct.def.delete]p4: | |||
16373 | // A deleted function is implicitly inline. | |||
16374 | Fn->setImplicitlyInline(); | |||
16375 | Fn->setDeletedAsWritten(); | |||
16376 | ||||
16377 | // See if we're deleting a function which is already known to override a | |||
16378 | // non-deleted virtual function. | |||
16379 | if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn)) { | |||
16380 | bool IssuedDiagnostic = false; | |||
16381 | for (const CXXMethodDecl *O : MD->overridden_methods()) { | |||
16382 | if (!(*MD->begin_overridden_methods())->isDeleted()) { | |||
16383 | if (!IssuedDiagnostic) { | |||
16384 | Diag(DelLoc, diag::err_deleted_override) << MD->getDeclName(); | |||
16385 | IssuedDiagnostic = true; | |||
16386 | } | |||
16387 | Diag(O->getLocation(), diag::note_overridden_virtual_function); | |||
16388 | } | |||
16389 | } | |||
16390 | // If this function was implicitly deleted because it was defaulted, | |||
16391 | // explain why it was deleted. | |||
16392 | if (IssuedDiagnostic && MD->isDefaulted()) | |||
16393 | DiagnoseDeletedDefaultedFunction(MD); | |||
16394 | } | |||
16395 | } | |||
16396 | ||||
16397 | void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { | |||
16398 | if (!Dcl || Dcl->isInvalidDecl()) | |||
16399 | return; | |||
16400 | ||||
16401 | auto *FD = dyn_cast<FunctionDecl>(Dcl); | |||
16402 | if (!FD) { | |||
16403 | if (auto *FTD = dyn_cast<FunctionTemplateDecl>(Dcl)) { | |||
16404 | if (getDefaultedFunctionKind(FTD->getTemplatedDecl()).isComparison()) { | |||
16405 | Diag(DefaultLoc, diag::err_defaulted_comparison_template); | |||
16406 | return; | |||
16407 | } | |||
16408 | } | |||
16409 | ||||
16410 | Diag(DefaultLoc, diag::err_default_special_members) | |||
16411 | << getLangOpts().CPlusPlus2a; | |||
16412 | return; | |||
16413 | } | |||
16414 | ||||
16415 | // Reject if this can't possibly be a defaultable function. | |||
16416 | DefaultedFunctionKind DefKind = getDefaultedFunctionKind(FD); | |||
16417 | if (!DefKind && | |||
16418 | // A dependent function that doesn't locally look defaultable can | |||
16419 | // still instantiate to a defaultable function if it's a constructor | |||
16420 | // or assignment operator. | |||
16421 | (!FD->isDependentContext() || | |||
16422 | (!isa<CXXConstructorDecl>(FD) && | |||
16423 | FD->getDeclName().getCXXOverloadedOperator() != OO_Equal))) { | |||
16424 | Diag(DefaultLoc, diag::err_default_special_members) | |||
16425 | << getLangOpts().CPlusPlus2a; | |||
16426 | return; | |||
16427 | } | |||
16428 | ||||
16429 | if (DefKind.isComparison() && | |||
16430 | !isa<CXXRecordDecl>(FD->getLexicalDeclContext())) { | |||
16431 | Diag(FD->getLocation(), diag::err_defaulted_comparison_out_of_class) | |||
16432 | << (int)DefKind.asComparison(); | |||
16433 | return; | |||
16434 | } | |||
16435 | ||||
16436 | // Issue compatibility warning. We already warned if the operator is | |||
16437 | // 'operator<=>' when parsing the '<=>' token. | |||
16438 | if (DefKind.isComparison() && | |||
16439 | DefKind.asComparison() != DefaultedComparisonKind::ThreeWay) { | |||
16440 | Diag(DefaultLoc, getLangOpts().CPlusPlus2a | |||
16441 | ? diag::warn_cxx17_compat_defaulted_comparison | |||
16442 | : diag::ext_defaulted_comparison); | |||
16443 | } | |||
16444 | ||||
16445 | FD->setDefaulted(); | |||
16446 | FD->setExplicitlyDefaulted(); | |||
16447 | ||||
16448 | // Defer checking functions that are defaulted in a dependent context. | |||
16449 | if (FD->isDependentContext()) | |||
16450 | return; | |||
16451 | ||||
16452 | // Unset that we will have a body for this function. We might not, | |||
16453 | // if it turns out to be trivial, and we don't need this marking now | |||
16454 | // that we've marked it as defaulted. | |||
16455 | FD->setWillHaveBody(false); | |||
16456 | ||||
16457 | // If this definition appears within the record, do the checking when | |||
16458 | // the record is complete. This is always the case for a defaulted | |||
16459 | // comparison. | |||
16460 | if (DefKind.isComparison()) | |||
16461 | return; | |||
16462 | auto *MD = cast<CXXMethodDecl>(FD); | |||
16463 | ||||
16464 | const FunctionDecl *Primary = FD; | |||
16465 | if (const FunctionDecl *Pattern = FD->getTemplateInstantiationPattern()) | |||
16466 | // Ask the template instantiation pattern that actually had the | |||
16467 | // '= default' on it. | |||
16468 | Primary = Pattern; | |||
16469 | ||||
16470 | // If the method was defaulted on its first declaration, we will have | |||
16471 | // already performed the checking in CheckCompletedCXXClass. Such a | |||
16472 | // declaration doesn't trigger an implicit definition. | |||
16473 | if (Primary->getCanonicalDecl()->isDefaulted()) | |||
16474 | return; | |||
16475 | ||||
16476 | if (CheckExplicitlyDefaultedSpecialMember(MD, DefKind.asSpecialMember())) | |||
16477 | MD->setInvalidDecl(); | |||
16478 | else | |||
16479 | DefineImplicitSpecialMember(*this, MD, DefaultLoc); | |||
16480 | } | |||
16481 | ||||
16482 | static void SearchForReturnInStmt(Sema &Self, Stmt *S) { | |||
16483 | for (Stmt *SubStmt : S->children()) { | |||
16484 | if (!SubStmt) | |||
16485 | continue; | |||
16486 | if (isa<ReturnStmt>(SubStmt)) | |||
16487 | Self.Diag(SubStmt->getBeginLoc(), | |||
16488 | diag::err_return_in_constructor_handler); | |||
16489 | if (!isa<Expr>(SubStmt)) | |||
16490 | SearchForReturnInStmt(Self, SubStmt); | |||
16491 | } | |||
16492 | } | |||
16493 | ||||
16494 | void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { | |||
16495 | for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { | |||
16496 | CXXCatchStmt *Handler = TryBlock->getHandler(I); | |||
16497 | SearchForReturnInStmt(*this, Handler); | |||
16498 | } | |||
16499 | } | |||
16500 | ||||
16501 | bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, | |||
16502 | const CXXMethodDecl *Old) { | |||
16503 | const auto *NewFT = New->getType()->castAs<FunctionProtoType>(); | |||
16504 | const auto *OldFT = Old->getType()->castAs<FunctionProtoType>(); | |||
16505 | ||||
16506 | if (OldFT->hasExtParameterInfos()) { | |||
16507 | for (unsigned I = 0, E = OldFT->getNumParams(); I != E; ++I) | |||
16508 | // A parameter of the overriding method should be annotated with noescape | |||
16509 | // if the corresponding parameter of the overridden method is annotated. | |||
16510 | if (OldFT->getExtParameterInfo(I).isNoEscape() && | |||
16511 | !NewFT->getExtParameterInfo(I).isNoEscape()) { | |||
16512 | Diag(New->getParamDecl(I)->getLocation(), | |||
16513 | diag::warn_overriding_method_missing_noescape); | |||
16514 | Diag(Old->getParamDecl(I)->getLocation(), | |||
16515 | diag::note_overridden_marked_noescape); | |||
16516 | } | |||
16517 | } | |||
16518 | ||||
16519 | // Virtual overrides must have the same code_seg. | |||
16520 | const auto *OldCSA = Old->getAttr<CodeSegAttr>(); | |||
16521 | const auto *NewCSA = New->getAttr<CodeSegAttr>(); | |||
16522 | if ((NewCSA || OldCSA) && | |||
16523 | (!OldCSA || !NewCSA || NewCSA->getName() != OldCSA->getName())) { | |||
16524 | Diag(New->getLocation(), diag::err_mismatched_code_seg_override); | |||
16525 | Diag(Old->getLocation(), diag::note_previous_declaration); | |||
16526 | return true; | |||
16527 | } | |||
16528 | ||||
16529 | CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv(); | |||
16530 | ||||
16531 | // If the calling conventions match, everything is fine | |||
16532 | if (NewCC == OldCC) | |||
16533 | return false; | |||
16534 | ||||
16535 | // If the calling conventions mismatch because the new function is static, | |||
16536 | // suppress the calling convention mismatch error; the error about static | |||
16537 | // function override (err_static_overrides_virtual from | |||
16538 | // Sema::CheckFunctionDeclaration) is more clear. | |||
16539 | if (New->getStorageClass() == SC_Static) | |||
16540 | return false; | |||
16541 | ||||
16542 | Diag(New->getLocation(), | |||
16543 | diag::err_conflicting_overriding_cc_attributes) | |||
16544 | << New->getDeclName() << New->getType() << Old->getType(); | |||
16545 | Diag(Old->getLocation(), diag::note_overridden_virtual_function); | |||
16546 | return true; | |||
16547 | } | |||
16548 | ||||
16549 | bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, | |||
16550 | const CXXMethodDecl *Old) { | |||
16551 | QualType NewTy = New->getType()->castAs<FunctionType>()->getReturnType(); | |||
16552 | QualType OldTy = Old->getType()->castAs<FunctionType>()->getReturnType(); | |||
16553 | ||||
16554 | if (Context.hasSameType(NewTy, OldTy) || | |||
16555 | NewTy->isDependentType() || OldTy->isDependentType()) | |||
16556 | return false; | |||
16557 | ||||
16558 | // Check if the return types are covariant | |||
16559 | QualType NewClassTy, OldClassTy; | |||
16560 | ||||
16561 | /// Both types must be pointers or references to classes. | |||
16562 | if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { | |||
16563 | if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { | |||
16564 | NewClassTy = NewPT->getPointeeType(); | |||
16565 | OldClassTy = OldPT->getPointeeType(); | |||
16566 | } | |||
16567 | } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { | |||
16568 | if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { | |||
16569 | if (NewRT->getTypeClass() == OldRT->getTypeClass()) { | |||
16570 | NewClassTy = NewRT->getPointeeType(); | |||
16571 | OldClassTy = OldRT->getPointeeType(); | |||
16572 | } | |||
16573 | } | |||
16574 | } | |||
16575 | ||||
16576 | // The return types aren't either both pointers or references to a class type. | |||
16577 | if (NewClassTy.isNull()) { | |||
16578 | Diag(New->getLocation(), | |||
16579 | diag::err_different_return_type_for_overriding_virtual_function) | |||
16580 | << New->getDeclName() << NewTy << OldTy | |||
16581 | << New->getReturnTypeSourceRange(); | |||
16582 | Diag(Old->getLocation(), diag::note_overridden_virtual_function) | |||
16583 | << Old->getReturnTypeSourceRange(); | |||
16584 | ||||
16585 | return true; | |||
16586 | } | |||
16587 | ||||
16588 | if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { | |||
16589 | // C++14 [class.virtual]p8: | |||
16590 | // If the class type in the covariant return type of D::f differs from | |||
16591 | // that of B::f, the class type in the return type of D::f shall be | |||
16592 | // complete at the point of declaration of D::f or shall be the class | |||
16593 | // type D. | |||
16594 | if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { | |||
16595 | if (!RT->isBeingDefined() && | |||
16596 | RequireCompleteType(New->getLocation(), NewClassTy, | |||
16597 | diag::err_covariant_return_incomplete, | |||
16598 | New->getDeclName())) | |||
16599 | return true; | |||
16600 | } | |||
16601 | ||||
16602 | // Check if the new class derives from the old class. | |||
16603 | if (!IsDerivedFrom(New->getLocation(), NewClassTy, OldClassTy)) { | |||
16604 | Diag(New->getLocation(), diag::err_covariant_return_not_derived) | |||
16605 | << New->getDeclName() << NewTy << OldTy | |||
16606 | << New->getReturnTypeSourceRange(); | |||
16607 | Diag(Old->getLocation(), diag::note_overridden_virtual_function) | |||
16608 | << Old->getReturnTypeSourceRange(); | |||
16609 | return true; | |||
16610 | } | |||
16611 | ||||
16612 | // Check if we the conversion from derived to base is valid. | |||
16613 | if (CheckDerivedToBaseConversion( | |||
16614 | NewClassTy, OldClassTy, | |||
16615 | diag::err_covariant_return_inaccessible_base, | |||
16616 | diag::err_covariant_return_ambiguous_derived_to_base_conv, | |||
16617 | New->getLocation(), New->getReturnTypeSourceRange(), | |||
16618 | New->getDeclName(), nullptr)) { | |||
16619 | // FIXME: this note won't trigger for delayed access control | |||
16620 | // diagnostics, and it's impossible to get an undelayed error | |||
16621 | // here from access control during the original parse because | |||
16622 | // the ParsingDeclSpec/ParsingDeclarator are still in scope. | |||
16623 | Diag(Old->getLocation(), diag::note_overridden_virtual_function) | |||
16624 | << Old->getReturnTypeSourceRange(); | |||
16625 | return true; | |||
16626 | } | |||
16627 | } | |||
16628 | ||||
16629 | // The qualifiers of the return types must be the same. | |||
16630 | if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { | |||
16631 | Diag(New->getLocation(), | |||
16632 | diag::err_covariant_return_type_different_qualifications) | |||
16633 | << New->getDeclName() << NewTy << OldTy | |||
16634 | << New->getReturnTypeSourceRange(); | |||
16635 | Diag(Old->getLocation(), diag::note_overridden_virtual_function) | |||
16636 | << Old->getReturnTypeSourceRange(); | |||
16637 | return true; | |||
16638 | } | |||
16639 | ||||
16640 | ||||
16641 | // The new class type must have the same or less qualifiers as the old type. | |||
16642 | if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { | |||
16643 | Diag(New->getLocation(), | |||
16644 | diag::err_covariant_return_type_class_type_more_qualified) | |||
16645 | << New->getDeclName() << NewTy << OldTy | |||
16646 | << New->getReturnTypeSourceRange(); | |||
16647 | Diag(Old->getLocation(), diag::note_overridden_virtual_function) | |||
16648 | << Old->getReturnTypeSourceRange(); | |||
16649 | return true; | |||
16650 | } | |||
16651 | ||||
16652 | return false; | |||
16653 | } | |||
16654 | ||||
16655 | /// Mark the given method pure. | |||
16656 | /// | |||
16657 | /// \param Method the method to be marked pure. | |||
16658 | /// | |||
16659 | /// \param InitRange the source range that covers the "0" initializer. | |||
16660 | bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { | |||
16661 | SourceLocation EndLoc = InitRange.getEnd(); | |||
16662 | if (EndLoc.isValid()) | |||
16663 | Method->setRangeEnd(EndLoc); | |||
16664 | ||||
16665 | if (Method->isVirtual() || Method->getParent()->isDependentContext()) { | |||
16666 | Method->setPure(); | |||
16667 | return false; | |||
16668 | } | |||
16669 | ||||
16670 | if (!Method->isInvalidDecl()) | |||
16671 | Diag(Method->getLocation(), diag::err_non_virtual_pure) | |||
16672 | << Method->getDeclName() << InitRange; | |||
16673 | return true; | |||
16674 | } | |||
16675 | ||||
16676 | void Sema::ActOnPureSpecifier(Decl *D, SourceLocation ZeroLoc) { | |||
16677 | if (D->getFriendObjectKind()) | |||
16678 | Diag(D->getLocation(), diag::err_pure_friend); | |||
16679 | else if (auto *M = dyn_cast<CXXMethodDecl>(D)) | |||
16680 | CheckPureMethod(M, ZeroLoc); | |||
16681 | else | |||
16682 | Diag(D->getLocation(), diag::err_illegal_initializer); | |||
16683 | } | |||
16684 | ||||
16685 | /// Determine whether the given declaration is a global variable or | |||
16686 | /// static data member. | |||
16687 | static bool isNonlocalVariable(const Decl *D) { | |||
16688 | if (const VarDecl *Var = dyn_cast_or_null<VarDecl>(D)) | |||
16689 | return Var->hasGlobalStorage(); | |||
16690 | ||||
16691 | return false; | |||
16692 | } | |||
16693 | ||||
16694 | /// Invoked when we are about to parse an initializer for the declaration | |||
16695 | /// 'Dcl'. | |||
16696 | /// | |||
16697 | /// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a | |||
16698 | /// static data member of class X, names should be looked up in the scope of | |||
16699 | /// class X. If the declaration had a scope specifier, a scope will have | |||
16700 | /// been created and passed in for this purpose. Otherwise, S will be null. | |||
16701 | void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { | |||
16702 | // If there is no declaration, there was an error parsing it. | |||
16703 | if (!D || D->isInvalidDecl()) | |||
16704 | return; | |||
16705 | ||||
16706 | // We will always have a nested name specifier here, but this declaration | |||
16707 | // might not be out of line if the specifier names the current namespace: | |||
16708 | // extern int n; | |||
16709 | // int ::n = 0; | |||
16710 | if (S && D->isOutOfLine()) | |||
16711 | EnterDeclaratorContext(S, D->getDeclContext()); | |||
16712 | ||||
16713 | // If we are parsing the initializer for a static data member, push a | |||
16714 | // new expression evaluation context that is associated with this static | |||
16715 | // data member. | |||
16716 | if (isNonlocalVariable(D)) | |||
16717 | PushExpressionEvaluationContext( | |||
16718 | ExpressionEvaluationContext::PotentiallyEvaluated, D); | |||
16719 | } | |||
16720 | ||||
16721 | /// Invoked after we are finished parsing an initializer for the declaration D. | |||
16722 | void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { | |||
16723 | // If there is no declaration, there was an error parsing it. | |||
16724 | if (!D || D->isInvalidDecl()) | |||
16725 | return; | |||
16726 | ||||
16727 | if (isNonlocalVariable(D)) | |||
16728 | PopExpressionEvaluationContext(); | |||
16729 | ||||
16730 | if (S && D->isOutOfLine()) | |||
16731 | ExitDeclaratorContext(S); | |||
16732 | } | |||
16733 | ||||
16734 | /// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a | |||
16735 | /// C++ if/switch/while/for statement. | |||
16736 | /// e.g: "if (int x = f()) {...}" | |||
16737 | DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { | |||
16738 | // C++ 6.4p2: | |||
16739 | // The declarator shall not specify a function or an array. | |||
16740 | // The type-specifier-seq shall not contain typedef and shall not declare a | |||
16741 | // new class or enumeration. | |||
16742 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 16743, __PRETTY_FUNCTION__)) | |||
16743 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 16743, __PRETTY_FUNCTION__)); | |||
16744 | ||||
16745 | Decl *Dcl = ActOnDeclarator(S, D); | |||
16746 | if (!Dcl) | |||
16747 | return true; | |||
16748 | ||||
16749 | if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. | |||
16750 | Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) | |||
16751 | << D.getSourceRange(); | |||
16752 | return true; | |||
16753 | } | |||
16754 | ||||
16755 | return Dcl; | |||
16756 | } | |||
16757 | ||||
16758 | void Sema::LoadExternalVTableUses() { | |||
16759 | if (!ExternalSource) | |||
16760 | return; | |||
16761 | ||||
16762 | SmallVector<ExternalVTableUse, 4> VTables; | |||
16763 | ExternalSource->ReadUsedVTables(VTables); | |||
16764 | SmallVector<VTableUse, 4> NewUses; | |||
16765 | for (unsigned I = 0, N = VTables.size(); I != N; ++I) { | |||
16766 | llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos | |||
16767 | = VTablesUsed.find(VTables[I].Record); | |||
16768 | // Even if a definition wasn't required before, it may be required now. | |||
16769 | if (Pos != VTablesUsed.end()) { | |||
16770 | if (!Pos->second && VTables[I].DefinitionRequired) | |||
16771 | Pos->second = true; | |||
16772 | continue; | |||
16773 | } | |||
16774 | ||||
16775 | VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; | |||
16776 | NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); | |||
16777 | } | |||
16778 | ||||
16779 | VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); | |||
16780 | } | |||
16781 | ||||
16782 | void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, | |||
16783 | bool DefinitionRequired) { | |||
16784 | // Ignore any vtable uses in unevaluated operands or for classes that do | |||
16785 | // not have a vtable. | |||
16786 | if (!Class->isDynamicClass() || Class->isDependentContext() || | |||
16787 | CurContext->isDependentContext() || isUnevaluatedContext()) | |||
16788 | return; | |||
16789 | // Do not mark as used if compiling for the device outside of the target | |||
16790 | // region. | |||
16791 | if (TUKind != TU_Prefix && LangOpts.OpenMP && LangOpts.OpenMPIsDevice && | |||
16792 | !isInOpenMPDeclareTargetContext() && | |||
16793 | !isInOpenMPTargetExecutionDirective()) { | |||
16794 | if (!DefinitionRequired) | |||
16795 | MarkVirtualMembersReferenced(Loc, Class); | |||
16796 | return; | |||
16797 | } | |||
16798 | ||||
16799 | // Try to insert this class into the map. | |||
16800 | LoadExternalVTableUses(); | |||
16801 | Class = Class->getCanonicalDecl(); | |||
16802 | std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> | |||
16803 | Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); | |||
16804 | if (!Pos.second) { | |||
16805 | // If we already had an entry, check to see if we are promoting this vtable | |||
16806 | // to require a definition. If so, we need to reappend to the VTableUses | |||
16807 | // list, since we may have already processed the first entry. | |||
16808 | if (DefinitionRequired && !Pos.first->second) { | |||
16809 | Pos.first->second = true; | |||
16810 | } else { | |||
16811 | // Otherwise, we can early exit. | |||
16812 | return; | |||
16813 | } | |||
16814 | } else { | |||
16815 | // The Microsoft ABI requires that we perform the destructor body | |||
16816 | // checks (i.e. operator delete() lookup) when the vtable is marked used, as | |||
16817 | // the deleting destructor is emitted with the vtable, not with the | |||
16818 | // destructor definition as in the Itanium ABI. | |||
16819 | if (Context.getTargetInfo().getCXXABI().isMicrosoft()) { | |||
16820 | CXXDestructorDecl *DD = Class->getDestructor(); | |||
16821 | if (DD && DD->isVirtual() && !DD->isDeleted()) { | |||
16822 | if (Class->hasUserDeclaredDestructor() && !DD->isDefined()) { | |||
16823 | // If this is an out-of-line declaration, marking it referenced will | |||
16824 | // not do anything. Manually call CheckDestructor to look up operator | |||
16825 | // delete(). | |||
16826 | ContextRAII SavedContext(*this, DD); | |||
16827 | CheckDestructor(DD); | |||
16828 | } else { | |||
16829 | MarkFunctionReferenced(Loc, Class->getDestructor()); | |||
16830 | } | |||
16831 | } | |||
16832 | } | |||
16833 | } | |||
16834 | ||||
16835 | // Local classes need to have their virtual members marked | |||
16836 | // immediately. For all other classes, we mark their virtual members | |||
16837 | // at the end of the translation unit. | |||
16838 | if (Class->isLocalClass()) | |||
16839 | MarkVirtualMembersReferenced(Loc, Class); | |||
16840 | else | |||
16841 | VTableUses.push_back(std::make_pair(Class, Loc)); | |||
16842 | } | |||
16843 | ||||
16844 | bool Sema::DefineUsedVTables() { | |||
16845 | LoadExternalVTableUses(); | |||
16846 | if (VTableUses.empty()) | |||
16847 | return false; | |||
16848 | ||||
16849 | // Note: The VTableUses vector could grow as a result of marking | |||
16850 | // the members of a class as "used", so we check the size each | |||
16851 | // time through the loop and prefer indices (which are stable) to | |||
16852 | // iterators (which are not). | |||
16853 | bool DefinedAnything = false; | |||
16854 | for (unsigned I = 0; I != VTableUses.size(); ++I) { | |||
16855 | CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); | |||
16856 | if (!Class) | |||
16857 | continue; | |||
16858 | TemplateSpecializationKind ClassTSK = | |||
16859 | Class->getTemplateSpecializationKind(); | |||
16860 | ||||
16861 | SourceLocation Loc = VTableUses[I].second; | |||
16862 | ||||
16863 | bool DefineVTable = true; | |||
16864 | ||||
16865 | // If this class has a key function, but that key function is | |||
16866 | // defined in another translation unit, we don't need to emit the | |||
16867 | // vtable even though we're using it. | |||
16868 | const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class); | |||
16869 | if (KeyFunction && !KeyFunction->hasBody()) { | |||
16870 | // The key function is in another translation unit. | |||
16871 | DefineVTable = false; | |||
16872 | TemplateSpecializationKind TSK = | |||
16873 | KeyFunction->getTemplateSpecializationKind(); | |||
16874 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 16876, __PRETTY_FUNCTION__)) | |||
16875 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 16876, __PRETTY_FUNCTION__)) | |||
16876 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 16876, __PRETTY_FUNCTION__)); | |||
16877 | (void)TSK; | |||
16878 | } else if (!KeyFunction) { | |||
16879 | // If we have a class with no key function that is the subject | |||
16880 | // of an explicit instantiation declaration, suppress the | |||
16881 | // vtable; it will live with the explicit instantiation | |||
16882 | // definition. | |||
16883 | bool IsExplicitInstantiationDeclaration = | |||
16884 | ClassTSK == TSK_ExplicitInstantiationDeclaration; | |||
16885 | for (auto R : Class->redecls()) { | |||
16886 | TemplateSpecializationKind TSK | |||
16887 | = cast<CXXRecordDecl>(R)->getTemplateSpecializationKind(); | |||
16888 | if (TSK == TSK_ExplicitInstantiationDeclaration) | |||
16889 | IsExplicitInstantiationDeclaration = true; | |||
16890 | else if (TSK == TSK_ExplicitInstantiationDefinition) { | |||
16891 | IsExplicitInstantiationDeclaration = false; | |||
16892 | break; | |||
16893 | } | |||
16894 | } | |||
16895 | ||||
16896 | if (IsExplicitInstantiationDeclaration) | |||
16897 | DefineVTable = false; | |||
16898 | } | |||
16899 | ||||
16900 | // The exception specifications for all virtual members may be needed even | |||
16901 | // if we are not providing an authoritative form of the vtable in this TU. | |||
16902 | // We may choose to emit it available_externally anyway. | |||
16903 | if (!DefineVTable) { | |||
16904 | MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); | |||
16905 | continue; | |||
16906 | } | |||
16907 | ||||
16908 | // Mark all of the virtual members of this class as referenced, so | |||
16909 | // that we can build a vtable. Then, tell the AST consumer that a | |||
16910 | // vtable for this class is required. | |||
16911 | DefinedAnything = true; | |||
16912 | MarkVirtualMembersReferenced(Loc, Class); | |||
16913 | CXXRecordDecl *Canonical = Class->getCanonicalDecl(); | |||
16914 | if (VTablesUsed[Canonical]) | |||
16915 | Consumer.HandleVTable(Class); | |||
16916 | ||||
16917 | // Warn if we're emitting a weak vtable. The vtable will be weak if there is | |||
16918 | // no key function or the key function is inlined. Don't warn in C++ ABIs | |||
16919 | // that lack key functions, since the user won't be able to make one. | |||
16920 | if (Context.getTargetInfo().getCXXABI().hasKeyFunctions() && | |||
16921 | Class->isExternallyVisible() && ClassTSK != TSK_ImplicitInstantiation) { | |||
16922 | const FunctionDecl *KeyFunctionDef = nullptr; | |||
16923 | if (!KeyFunction || (KeyFunction->hasBody(KeyFunctionDef) && | |||
16924 | KeyFunctionDef->isInlined())) { | |||
16925 | Diag(Class->getLocation(), | |||
16926 | ClassTSK == TSK_ExplicitInstantiationDefinition | |||
16927 | ? diag::warn_weak_template_vtable | |||
16928 | : diag::warn_weak_vtable) | |||
16929 | << Class; | |||
16930 | } | |||
16931 | } | |||
16932 | } | |||
16933 | VTableUses.clear(); | |||
16934 | ||||
16935 | return DefinedAnything; | |||
16936 | } | |||
16937 | ||||
16938 | void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, | |||
16939 | const CXXRecordDecl *RD) { | |||
16940 | for (const auto *I : RD->methods()) | |||
16941 | if (I->isVirtual() && !I->isPure()) | |||
16942 | ResolveExceptionSpec(Loc, I->getType()->castAs<FunctionProtoType>()); | |||
16943 | } | |||
16944 | ||||
16945 | void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, | |||
16946 | const CXXRecordDecl *RD, | |||
16947 | bool ConstexprOnly) { | |||
16948 | // Mark all functions which will appear in RD's vtable as used. | |||
16949 | CXXFinalOverriderMap FinalOverriders; | |||
16950 | RD->getFinalOverriders(FinalOverriders); | |||
16951 | for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), | |||
16952 | E = FinalOverriders.end(); | |||
16953 | I != E; ++I) { | |||
16954 | for (OverridingMethods::const_iterator OI = I->second.begin(), | |||
16955 | OE = I->second.end(); | |||
16956 | OI != OE; ++OI) { | |||
16957 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 16957, __PRETTY_FUNCTION__)); | |||
16958 | CXXMethodDecl *Overrider = OI->second.front().Method; | |||
16959 | ||||
16960 | // C++ [basic.def.odr]p2: | |||
16961 | // [...] A virtual member function is used if it is not pure. [...] | |||
16962 | if (!Overrider->isPure() && (!ConstexprOnly || Overrider->isConstexpr())) | |||
16963 | MarkFunctionReferenced(Loc, Overrider); | |||
16964 | } | |||
16965 | } | |||
16966 | ||||
16967 | // Only classes that have virtual bases need a VTT. | |||
16968 | if (RD->getNumVBases() == 0) | |||
16969 | return; | |||
16970 | ||||
16971 | for (const auto &I : RD->bases()) { | |||
16972 | const auto *Base = | |||
16973 | cast<CXXRecordDecl>(I.getType()->castAs<RecordType>()->getDecl()); | |||
16974 | if (Base->getNumVBases() == 0) | |||
16975 | continue; | |||
16976 | MarkVirtualMembersReferenced(Loc, Base); | |||
16977 | } | |||
16978 | } | |||
16979 | ||||
16980 | /// SetIvarInitializers - This routine builds initialization ASTs for the | |||
16981 | /// Objective-C implementation whose ivars need be initialized. | |||
16982 | void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { | |||
16983 | if (!getLangOpts().CPlusPlus) | |||
16984 | return; | |||
16985 | if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { | |||
16986 | SmallVector<ObjCIvarDecl*, 8> ivars; | |||
16987 | CollectIvarsToConstructOrDestruct(OID, ivars); | |||
16988 | if (ivars.empty()) | |||
16989 | return; | |||
16990 | SmallVector<CXXCtorInitializer*, 32> AllToInit; | |||
16991 | for (unsigned i = 0; i < ivars.size(); i++) { | |||
16992 | FieldDecl *Field = ivars[i]; | |||
16993 | if (Field->isInvalidDecl()) | |||
16994 | continue; | |||
16995 | ||||
16996 | CXXCtorInitializer *Member; | |||
16997 | InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); | |||
16998 | InitializationKind InitKind = | |||
16999 | InitializationKind::CreateDefault(ObjCImplementation->getLocation()); | |||
17000 | ||||
17001 | InitializationSequence InitSeq(*this, InitEntity, InitKind, None); | |||
17002 | ExprResult MemberInit = | |||
17003 | InitSeq.Perform(*this, InitEntity, InitKind, None); | |||
17004 | MemberInit = MaybeCreateExprWithCleanups(MemberInit); | |||
17005 | // Note, MemberInit could actually come back empty if no initialization | |||
17006 | // is required (e.g., because it would call a trivial default constructor) | |||
17007 | if (!MemberInit.get() || MemberInit.isInvalid()) | |||
17008 | continue; | |||
17009 | ||||
17010 | Member = | |||
17011 | new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), | |||
17012 | SourceLocation(), | |||
17013 | MemberInit.getAs<Expr>(), | |||
17014 | SourceLocation()); | |||
17015 | AllToInit.push_back(Member); | |||
17016 | ||||
17017 | // Be sure that the destructor is accessible and is marked as referenced. | |||
17018 | if (const RecordType *RecordTy = | |||
17019 | Context.getBaseElementType(Field->getType()) | |||
17020 | ->getAs<RecordType>()) { | |||
17021 | CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); | |||
17022 | if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { | |||
17023 | MarkFunctionReferenced(Field->getLocation(), Destructor); | |||
17024 | CheckDestructorAccess(Field->getLocation(), Destructor, | |||
17025 | PDiag(diag::err_access_dtor_ivar) | |||
17026 | << Context.getBaseElementType(Field->getType())); | |||
17027 | } | |||
17028 | } | |||
17029 | } | |||
17030 | ObjCImplementation->setIvarInitializers(Context, | |||
17031 | AllToInit.data(), AllToInit.size()); | |||
17032 | } | |||
17033 | } | |||
17034 | ||||
17035 | static | |||
17036 | void DelegatingCycleHelper(CXXConstructorDecl* Ctor, | |||
17037 | llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Valid, | |||
17038 | llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Invalid, | |||
17039 | llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Current, | |||
17040 | Sema &S) { | |||
17041 | if (Ctor->isInvalidDecl()) | |||
17042 | return; | |||
17043 | ||||
17044 | CXXConstructorDecl *Target = Ctor->getTargetConstructor(); | |||
17045 | ||||
17046 | // Target may not be determinable yet, for instance if this is a dependent | |||
17047 | // call in an uninstantiated template. | |||
17048 | if (Target) { | |||
17049 | const FunctionDecl *FNTarget = nullptr; | |||
17050 | (void)Target->hasBody(FNTarget); | |||
17051 | Target = const_cast<CXXConstructorDecl*>( | |||
17052 | cast_or_null<CXXConstructorDecl>(FNTarget)); | |||
17053 | } | |||
17054 | ||||
17055 | CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), | |||
17056 | // Avoid dereferencing a null pointer here. | |||
17057 | *TCanonical = Target? Target->getCanonicalDecl() : nullptr; | |||
17058 | ||||
17059 | if (!Current.insert(Canonical).second) | |||
17060 | return; | |||
17061 | ||||
17062 | // We know that beyond here, we aren't chaining into a cycle. | |||
17063 | if (!Target || !Target->isDelegatingConstructor() || | |||
17064 | Target->isInvalidDecl() || Valid.count(TCanonical)) { | |||
17065 | Valid.insert(Current.begin(), Current.end()); | |||
17066 | Current.clear(); | |||
17067 | // We've hit a cycle. | |||
17068 | } else if (TCanonical == Canonical || Invalid.count(TCanonical) || | |||
17069 | Current.count(TCanonical)) { | |||
17070 | // If we haven't diagnosed this cycle yet, do so now. | |||
17071 | if (!Invalid.count(TCanonical)) { | |||
17072 | S.Diag((*Ctor->init_begin())->getSourceLocation(), | |||
17073 | diag::warn_delegating_ctor_cycle) | |||
17074 | << Ctor; | |||
17075 | ||||
17076 | // Don't add a note for a function delegating directly to itself. | |||
17077 | if (TCanonical != Canonical) | |||
17078 | S.Diag(Target->getLocation(), diag::note_it_delegates_to); | |||
17079 | ||||
17080 | CXXConstructorDecl *C = Target; | |||
17081 | while (C->getCanonicalDecl() != Canonical) { | |||
17082 | const FunctionDecl *FNTarget = nullptr; | |||
17083 | (void)C->getTargetConstructor()->hasBody(FNTarget); | |||
17084 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 17084, __PRETTY_FUNCTION__)); | |||
17085 | ||||
17086 | C = const_cast<CXXConstructorDecl*>( | |||
17087 | cast<CXXConstructorDecl>(FNTarget)); | |||
17088 | S.Diag(C->getLocation(), diag::note_which_delegates_to); | |||
17089 | } | |||
17090 | } | |||
17091 | ||||
17092 | Invalid.insert(Current.begin(), Current.end()); | |||
17093 | Current.clear(); | |||
17094 | } else { | |||
17095 | DelegatingCycleHelper(Target, Valid, Invalid, Current, S); | |||
17096 | } | |||
17097 | } | |||
17098 | ||||
17099 | ||||
17100 | void Sema::CheckDelegatingCtorCycles() { | |||
17101 | llvm::SmallPtrSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; | |||
17102 | ||||
17103 | for (DelegatingCtorDeclsType::iterator | |||
17104 | I = DelegatingCtorDecls.begin(ExternalSource), | |||
17105 | E = DelegatingCtorDecls.end(); | |||
17106 | I != E; ++I) | |||
17107 | DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); | |||
17108 | ||||
17109 | for (auto CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) | |||
17110 | (*CI)->setInvalidDecl(); | |||
17111 | } | |||
17112 | ||||
17113 | namespace { | |||
17114 | /// AST visitor that finds references to the 'this' expression. | |||
17115 | class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { | |||
17116 | Sema &S; | |||
17117 | ||||
17118 | public: | |||
17119 | explicit FindCXXThisExpr(Sema &S) : S(S) { } | |||
17120 | ||||
17121 | bool VisitCXXThisExpr(CXXThisExpr *E) { | |||
17122 | S.Diag(E->getLocation(), diag::err_this_static_member_func) | |||
17123 | << E->isImplicit(); | |||
17124 | return false; | |||
17125 | } | |||
17126 | }; | |||
17127 | } | |||
17128 | ||||
17129 | bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { | |||
17130 | TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); | |||
17131 | if (!TSInfo) | |||
17132 | return false; | |||
17133 | ||||
17134 | TypeLoc TL = TSInfo->getTypeLoc(); | |||
17135 | FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); | |||
17136 | if (!ProtoTL) | |||
17137 | return false; | |||
17138 | ||||
17139 | // C++11 [expr.prim.general]p3: | |||
17140 | // [The expression this] shall not appear before the optional | |||
17141 | // cv-qualifier-seq and it shall not appear within the declaration of a | |||
17142 | // static member function (although its type and value category are defined | |||
17143 | // within a static member function as they are within a non-static member | |||
17144 | // function). [ Note: this is because declaration matching does not occur | |||
17145 | // until the complete declarator is known. - end note ] | |||
17146 | const FunctionProtoType *Proto = ProtoTL.getTypePtr(); | |||
17147 | FindCXXThisExpr Finder(*this); | |||
17148 | ||||
17149 | // If the return type came after the cv-qualifier-seq, check it now. | |||
17150 | if (Proto->hasTrailingReturn() && | |||
17151 | !Finder.TraverseTypeLoc(ProtoTL.getReturnLoc())) | |||
17152 | return true; | |||
17153 | ||||
17154 | // Check the exception specification. | |||
17155 | if (checkThisInStaticMemberFunctionExceptionSpec(Method)) | |||
17156 | return true; | |||
17157 | ||||
17158 | // Check the trailing requires clause | |||
17159 | if (Expr *E = Method->getTrailingRequiresClause()) | |||
17160 | if (!Finder.TraverseStmt(E)) | |||
17161 | return true; | |||
17162 | ||||
17163 | return checkThisInStaticMemberFunctionAttributes(Method); | |||
17164 | } | |||
17165 | ||||
17166 | bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { | |||
17167 | TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); | |||
17168 | if (!TSInfo) | |||
17169 | return false; | |||
17170 | ||||
17171 | TypeLoc TL = TSInfo->getTypeLoc(); | |||
17172 | FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); | |||
17173 | if (!ProtoTL) | |||
17174 | return false; | |||
17175 | ||||
17176 | const FunctionProtoType *Proto = ProtoTL.getTypePtr(); | |||
17177 | FindCXXThisExpr Finder(*this); | |||
17178 | ||||
17179 | switch (Proto->getExceptionSpecType()) { | |||
17180 | case EST_Unparsed: | |||
17181 | case EST_Uninstantiated: | |||
17182 | case EST_Unevaluated: | |||
17183 | case EST_BasicNoexcept: | |||
17184 | case EST_NoThrow: | |||
17185 | case EST_DynamicNone: | |||
17186 | case EST_MSAny: | |||
17187 | case EST_None: | |||
17188 | break; | |||
17189 | ||||
17190 | case EST_DependentNoexcept: | |||
17191 | case EST_NoexceptFalse: | |||
17192 | case EST_NoexceptTrue: | |||
17193 | if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) | |||
17194 | return true; | |||
17195 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; | |||
17196 | ||||
17197 | case EST_Dynamic: | |||
17198 | for (const auto &E : Proto->exceptions()) { | |||
17199 | if (!Finder.TraverseType(E)) | |||
17200 | return true; | |||
17201 | } | |||
17202 | break; | |||
17203 | } | |||
17204 | ||||
17205 | return false; | |||
17206 | } | |||
17207 | ||||
17208 | bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { | |||
17209 | FindCXXThisExpr Finder(*this); | |||
17210 | ||||
17211 | // Check attributes. | |||
17212 | for (const auto *A : Method->attrs()) { | |||
17213 | // FIXME: This should be emitted by tblgen. | |||
17214 | Expr *Arg = nullptr; | |||
17215 | ArrayRef<Expr *> Args; | |||
17216 | if (const auto *G = dyn_cast<GuardedByAttr>(A)) | |||
17217 | Arg = G->getArg(); | |||
17218 | else if (const auto *G = dyn_cast<PtGuardedByAttr>(A)) | |||
17219 | Arg = G->getArg(); | |||
17220 | else if (const auto *AA = dyn_cast<AcquiredAfterAttr>(A)) | |||
17221 | Args = llvm::makeArrayRef(AA->args_begin(), AA->args_size()); | |||
17222 | else if (const auto *AB = dyn_cast<AcquiredBeforeAttr>(A)) | |||
17223 | Args = llvm::makeArrayRef(AB->args_begin(), AB->args_size()); | |||
17224 | else if (const auto *ETLF = dyn_cast<ExclusiveTrylockFunctionAttr>(A)) { | |||
17225 | Arg = ETLF->getSuccessValue(); | |||
17226 | Args = llvm::makeArrayRef(ETLF->args_begin(), ETLF->args_size()); | |||
17227 | } else if (const auto *STLF = dyn_cast<SharedTrylockFunctionAttr>(A)) { | |||
17228 | Arg = STLF->getSuccessValue(); | |||
17229 | Args = llvm::makeArrayRef(STLF->args_begin(), STLF->args_size()); | |||
17230 | } else if (const auto *LR = dyn_cast<LockReturnedAttr>(A)) | |||
17231 | Arg = LR->getArg(); | |||
17232 | else if (const auto *LE = dyn_cast<LocksExcludedAttr>(A)) | |||
17233 | Args = llvm::makeArrayRef(LE->args_begin(), LE->args_size()); | |||
17234 | else if (const auto *RC = dyn_cast<RequiresCapabilityAttr>(A)) | |||
17235 | Args = llvm::makeArrayRef(RC->args_begin(), RC->args_size()); | |||
17236 | else if (const auto *AC = dyn_cast<AcquireCapabilityAttr>(A)) | |||
17237 | Args = llvm::makeArrayRef(AC->args_begin(), AC->args_size()); | |||
17238 | else if (const auto *AC = dyn_cast<TryAcquireCapabilityAttr>(A)) | |||
17239 | Args = llvm::makeArrayRef(AC->args_begin(), AC->args_size()); | |||
17240 | else if (const auto *RC = dyn_cast<ReleaseCapabilityAttr>(A)) | |||
17241 | Args = llvm::makeArrayRef(RC->args_begin(), RC->args_size()); | |||
17242 | ||||
17243 | if (Arg && !Finder.TraverseStmt(Arg)) | |||
17244 | return true; | |||
17245 | ||||
17246 | for (unsigned I = 0, N = Args.size(); I != N; ++I) { | |||
17247 | if (!Finder.TraverseStmt(Args[I])) | |||
17248 | return true; | |||
17249 | } | |||
17250 | } | |||
17251 | ||||
17252 | return false; | |||
17253 | } | |||
17254 | ||||
17255 | void Sema::checkExceptionSpecification( | |||
17256 | bool IsTopLevel, ExceptionSpecificationType EST, | |||
17257 | ArrayRef<ParsedType> DynamicExceptions, | |||
17258 | ArrayRef<SourceRange> DynamicExceptionRanges, Expr *NoexceptExpr, | |||
17259 | SmallVectorImpl<QualType> &Exceptions, | |||
17260 | FunctionProtoType::ExceptionSpecInfo &ESI) { | |||
17261 | Exceptions.clear(); | |||
17262 | ESI.Type = EST; | |||
17263 | if (EST == EST_Dynamic) { | |||
17264 | Exceptions.reserve(DynamicExceptions.size()); | |||
17265 | for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { | |||
17266 | // FIXME: Preserve type source info. | |||
17267 | QualType ET = GetTypeFromParser(DynamicExceptions[ei]); | |||
17268 | ||||
17269 | if (IsTopLevel) { | |||
17270 | SmallVector<UnexpandedParameterPack, 2> Unexpanded; | |||
17271 | collectUnexpandedParameterPacks(ET, Unexpanded); | |||
17272 | if (!Unexpanded.empty()) { | |||
17273 | DiagnoseUnexpandedParameterPacks( | |||
17274 | DynamicExceptionRanges[ei].getBegin(), UPPC_ExceptionType, | |||
17275 | Unexpanded); | |||
17276 | continue; | |||
17277 | } | |||
17278 | } | |||
17279 | ||||
17280 | // Check that the type is valid for an exception spec, and | |||
17281 | // drop it if not. | |||
17282 | if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) | |||
17283 | Exceptions.push_back(ET); | |||
17284 | } | |||
17285 | ESI.Exceptions = Exceptions; | |||
17286 | return; | |||
17287 | } | |||
17288 | ||||
17289 | if (isComputedNoexcept(EST)) { | |||
17290 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 17293, __PRETTY_FUNCTION__)) | |||
17291 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 17293, __PRETTY_FUNCTION__)) | |||
17292 | 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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 17293, __PRETTY_FUNCTION__)) | |||
17293 | "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-11~++20200309111110+2c36c23f347/clang/lib/Sema/SemaDeclCXX.cpp" , 17293, __PRETTY_FUNCTION__)); | |||
17294 | if (IsTopLevel && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { | |||
17295 | ESI.Type = EST_BasicNoexcept; | |||
17296 | return; | |||
17297 | } | |||
17298 | ||||
17299 | ESI.NoexceptExpr = NoexceptExpr; | |||
17300 | return; | |||
17301 | } | |||
17302 | } | |||
17303 | ||||
17304 | void Sema::actOnDelayedExceptionSpecification(Decl *MethodD, | |||
17305 | ExceptionSpecificationType EST, | |||
17306 | SourceRange SpecificationRange, | |||
17307 | ArrayRef<ParsedType> DynamicExceptions, | |||
17308 | ArrayRef<SourceRange> DynamicExceptionRanges, | |||
17309 | Expr *NoexceptExpr) { | |||
17310 | if (!MethodD) | |||
17311 | return; | |||
17312 | ||||
17313 | // Dig out the method we're referring to. | |||
17314 | if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(MethodD)) | |||
17315 | MethodD = FunTmpl->getTemplatedDecl(); | |||
17316 | ||||
17317 | CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(MethodD); | |||
17318 | if (!Method) | |||
17319 | return; | |||
17320 | ||||
17321 | // Check the exception specification. | |||
17322 | llvm::SmallVector<QualType, 4> Exceptions; | |||
17323 | FunctionProtoType::ExceptionSpecInfo ESI; | |||
17324 | checkExceptionSpecification(/*IsTopLevel*/true, EST, DynamicExceptions, | |||
17325 | DynamicExceptionRanges, NoexceptExpr, Exceptions, | |||
17326 | ESI); | |||
17327 | ||||
17328 | // Update the exception specification on the function type. | |||
17329 | Context.adjustExceptionSpec(Method, ESI, /*AsWritten*/true); | |||
17330 | ||||
17331 | if (Method->isStatic()) | |||
17332 | checkThisInStaticMemberFunctionExceptionSpec(Method); | |||
17333 | ||||
17334 | if (Method->isVirtual()) { | |||
17335 | // Check overrides, which we previously had to delay. | |||
17336 | for (const CXXMethodDecl *O : Method->overridden_methods()) | |||
17337 | CheckOverridingFunctionExceptionSpec(Method, O); | |||
17338 | } | |||
17339 | } | |||
17340 | ||||
17341 | /// HandleMSProperty - Analyze a __delcspec(property) field of a C++ class. | |||
17342 | /// | |||
17343 | MSPropertyDecl *Sema::HandleMSProperty(Scope *S, RecordDecl *Record, | |||
17344 | SourceLocation DeclStart, Declarator &D, | |||
17345 | Expr *BitWidth, | |||
17346 | InClassInitStyle InitStyle, | |||
17347 | AccessSpecifier AS, | |||
17348 | const ParsedAttr &MSPropertyAttr) { | |||
17349 | IdentifierInfo *II = D.getIdentifier(); | |||
17350 | if (!II) { | |||
17351 | Diag(DeclStart, diag::err_anonymous_property); | |||
17352 | return nullptr; | |||
17353 | } | |||
17354 | SourceLocation Loc = D.getIdentifierLoc(); | |||
17355 | ||||
17356 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); | |||
17357 | QualType T = TInfo->getType(); | |||
17358 | if (getLangOpts().CPlusPlus) { | |||
17359 | CheckExtraCXXDefaultArguments(D); | |||
17360 | ||||
17361 | if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, | |||
17362 | UPPC_DataMemberType)) { | |||
17363 | D.setInvalidType(); | |||
17364 | T = Context.IntTy; | |||
17365 | TInfo = Context.getTrivialTypeSourceInfo(T, Loc); | |||
17366 | } | |||
17367 | } | |||
17368 | ||||
17369 | DiagnoseFunctionSpecifiers(D.getDeclSpec()); | |||
17370 | ||||
17371 | if (D.getDeclSpec().isInlineSpecified()) | |||
17372 | Diag(D.getDeclSpec().getInlineSpecLoc(), diag::err_inline_non_function) | |||
17373 | << getLangOpts().CPlusPlus17; | |||
17374 | if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec()) | |||
17375 | Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(), | |||
17376 | diag::err_invalid_thread) | |||
17377 | << DeclSpec::getSpecifierName(TSCS); | |||
17378 | ||||
17379 | // Check to see if this name was declared as a member previously | |||
17380 | NamedDecl *PrevDecl = nullptr; | |||
17381 | LookupResult Previous(*this, II, Loc, LookupMemberName, | |||
17382 | ForVisibleRedeclaration); | |||
17383 | LookupName(Previous, S); | |||
17384 | switch (Previous.getResultKind()) { | |||
17385 | case LookupResult::Found: | |||
17386 | case LookupResult::FoundUnresolvedValue: | |||
17387 | PrevDecl = Previous.getAsSingle<NamedDecl>(); | |||
17388 | break; | |||
17389 | ||||
17390 | case LookupResult::FoundOverloaded: | |||
17391 | PrevDecl = Previous.getRepresentativeDecl(); | |||
17392 | break; | |||
17393 | ||||
17394 | case LookupResult::NotFound: | |||
17395 | case LookupResult::NotFoundInCurrentInstantiation: | |||
17396 | case LookupResult::Ambiguous: | |||
17397 | break; | |||
17398 | } | |||
17399 | ||||
17400 | if (PrevDecl && PrevDecl->isTemplateParameter()) { | |||
17401 | // Maybe we will complain about the shadowed template parameter. | |||
17402 | DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); | |||
17403 | // Just pretend that we didn't see the previous declaration. | |||
17404 | PrevDecl = nullptr; | |||
17405 | } | |||
17406 | ||||
17407 | if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) | |||
17408 | PrevDecl = nullptr; | |||
17409 | ||||
17410 | SourceLocation TSSL = D.getBeginLoc(); | |||
17411 | MSPropertyDecl *NewPD = | |||
17412 | MSPropertyDecl::Create(Context, Record, Loc, II, T, TInfo, TSSL, | |||
17413 | MSPropertyAttr.getPropertyDataGetter(), | |||
17414 | MSPropertyAttr.getPropertyDataSetter()); | |||
17415 | ProcessDeclAttributes(TUScope, NewPD, D); | |||
17416 | NewPD->setAccess(AS); | |||
17417 | ||||
17418 | if (NewPD->isInvalidDecl()) | |||
17419 | Record->setInvalidDecl(); | |||
17420 | ||||
17421 | if (D.getDeclSpec().isModulePrivateSpecified()) | |||
17422 | NewPD->setModulePrivate(); | |||
17423 | ||||
17424 | if (NewPD->isInvalidDecl() && PrevDecl) { | |||
17425 | // Don't introduce NewFD into scope; there's already something | |||
17426 | // with the same name in the same scope. | |||
17427 | } else if (II) { | |||
17428 | PushOnScopeChains(NewPD, S); | |||
17429 | } else | |||
17430 | Record->addDecl(NewPD); | |||
17431 | ||||
17432 | return NewPD; | |||
17433 | } | |||
17434 | ||||
17435 | void Sema::ActOnStartFunctionDeclarationDeclarator( | |||
17436 | Declarator &Declarator, unsigned TemplateParameterDepth) { | |||
17437 | auto &Info = InventedParameterInfos.emplace_back(); | |||
17438 | TemplateParameterList *ExplicitParams = nullptr; | |||
17439 | ArrayRef<TemplateParameterList *> ExplicitLists = | |||
17440 | Declarator.getTemplateParameterLists(); | |||
17441 | if (!ExplicitLists.empty()) { | |||
17442 | bool IsMemberSpecialization, IsInvalid; | |||
17443 | ExplicitParams = MatchTemplateParametersToScopeSpecifier( | |||
17444 | Declarator.getBeginLoc(), Declarator.getIdentifierLoc(), | |||
17445 | Declarator.getCXXScopeSpec(), /*TemplateId=*/nullptr, | |||
17446 | ExplicitLists, /*IsFriend=*/false, IsMemberSpecialization, IsInvalid, | |||
17447 | /*SuppressDiagnostic=*/true); | |||
17448 | } | |||
17449 | if (ExplicitParams) { | |||
17450 | Info.AutoTemplateParameterDepth = ExplicitParams->getDepth(); | |||
17451 | for (NamedDecl *Param : *ExplicitParams) | |||
17452 | Info.TemplateParams.push_back(Param); | |||
17453 | Info.NumExplicitTemplateParams = ExplicitParams->size(); | |||
17454 | } else { | |||
17455 | Info.AutoTemplateParameterDepth = TemplateParameterDepth; | |||
17456 | Info.NumExplicitTemplateParams = 0; | |||
17457 | } | |||
17458 | } | |||
17459 | ||||
17460 | void Sema::ActOnFinishFunctionDeclarationDeclarator(Declarator &Declarator) { | |||
17461 | auto &FSI = InventedParameterInfos.back(); | |||
17462 | if (FSI.TemplateParams.size() > FSI.NumExplicitTemplateParams) { | |||
17463 | if (FSI.NumExplicitTemplateParams != 0) { | |||
17464 | TemplateParameterList *ExplicitParams = | |||
17465 | Declarator.getTemplateParameterLists().back(); | |||
17466 | Declarator.setInventedTemplateParameterList( | |||
17467 | TemplateParameterList::Create( | |||
17468 | Context, ExplicitParams->getTemplateLoc(), | |||
17469 | ExplicitParams->getLAngleLoc(), FSI.TemplateParams, | |||
17470 | ExplicitParams->getRAngleLoc(), | |||
17471 | ExplicitParams->getRequiresClause())); | |||
17472 | } else { | |||
17473 | Declarator.setInventedTemplateParameterList( | |||
17474 | TemplateParameterList::Create( | |||
17475 | Context, SourceLocation(), SourceLocation(), FSI.TemplateParams, | |||
17476 | SourceLocation(), /*RequiresClause=*/nullptr)); | |||
17477 | } | |||
17478 | } | |||
17479 | InventedParameterInfos.pop_back(); | |||
17480 | } |
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-11~++20200309111110+2c36c23f347/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 | virtual void printName(raw_ostream &os) const; |
269 | |
270 | /// Get the actual, stored name of the declaration, which may be a special |
271 | /// name. |
272 | DeclarationName getDeclName() const { return Name; } |
273 | |
274 | /// Set the name of this declaration. |
275 | void setDeclName(DeclarationName N) { Name = N; } |
276 | |
277 | /// Returns a human-readable qualified name for this declaration, like |
278 | /// A::B::i, for i being member of namespace A::B. |
279 | /// |
280 | /// If the declaration is not a member of context which can be named (record, |
281 | /// namespace), it will return the same result as printName(). |
282 | /// |
283 | /// Creating this name is expensive, so it should be called only when |
284 | /// performance doesn't matter. |
285 | void printQualifiedName(raw_ostream &OS) const; |
286 | void printQualifiedName(raw_ostream &OS, const PrintingPolicy &Policy) const; |
287 | |
288 | /// Print only the nested name specifier part of a fully-qualified name, |
289 | /// including the '::' at the end. E.g. |
290 | /// when `printQualifiedName(D)` prints "A::B::i", |
291 | /// this function prints "A::B::". |
292 | void printNestedNameSpecifier(raw_ostream &OS) const; |
293 | void printNestedNameSpecifier(raw_ostream &OS, |
294 | const PrintingPolicy &Policy) const; |
295 | |
296 | // FIXME: Remove string version. |
297 | std::string getQualifiedNameAsString() const; |
298 | |
299 | /// Appends a human-readable name for this declaration into the given stream. |
300 | /// |
301 | /// This is the method invoked by Sema when displaying a NamedDecl |
302 | /// in a diagnostic. It does not necessarily produce the same |
303 | /// result as printName(); for example, class template |
304 | /// specializations are printed with their template arguments. |
305 | virtual void getNameForDiagnostic(raw_ostream &OS, |
306 | const PrintingPolicy &Policy, |
307 | bool Qualified) const; |
308 | |
309 | /// Determine whether this declaration, if known to be well-formed within |
310 | /// its context, will replace the declaration OldD if introduced into scope. |
311 | /// |
312 | /// A declaration will replace another declaration if, for example, it is |
313 | /// a redeclaration of the same variable or function, but not if it is a |
314 | /// declaration of a different kind (function vs. class) or an overloaded |
315 | /// function. |
316 | /// |
317 | /// \param IsKnownNewer \c true if this declaration is known to be newer |
318 | /// than \p OldD (for instance, if this declaration is newly-created). |
319 | bool declarationReplaces(NamedDecl *OldD, bool IsKnownNewer = true) const; |
320 | |
321 | /// Determine whether this declaration has linkage. |
322 | bool hasLinkage() const; |
323 | |
324 | using Decl::isModulePrivate; |
325 | using Decl::setModulePrivate; |
326 | |
327 | /// Determine whether this declaration is a C++ class member. |
328 | bool isCXXClassMember() const { |
329 | const DeclContext *DC = getDeclContext(); |
330 | |
331 | // C++0x [class.mem]p1: |
332 | // The enumerators of an unscoped enumeration defined in |
333 | // the class are members of the class. |
334 | if (isa<EnumDecl>(DC)) |
335 | DC = DC->getRedeclContext(); |
336 | |
337 | return DC->isRecord(); |
338 | } |
339 | |
340 | /// Determine whether the given declaration is an instance member of |
341 | /// a C++ class. |
342 | bool isCXXInstanceMember() const; |
343 | |
344 | /// Determine what kind of linkage this entity has. |
345 | /// |
346 | /// This is not the linkage as defined by the standard or the codegen notion |
347 | /// of linkage. It is just an implementation detail that is used to compute |
348 | /// those. |
349 | Linkage getLinkageInternal() const; |
350 | |
351 | /// Get the linkage from a semantic point of view. Entities in |
352 | /// anonymous namespaces are external (in c++98). |
353 | Linkage getFormalLinkage() const { |
354 | return clang::getFormalLinkage(getLinkageInternal()); |
355 | } |
356 | |
357 | /// True if this decl has external linkage. |
358 | bool hasExternalFormalLinkage() const { |
359 | return isExternalFormalLinkage(getLinkageInternal()); |
360 | } |
361 | |
362 | bool isExternallyVisible() const { |
363 | return clang::isExternallyVisible(getLinkageInternal()); |
364 | } |
365 | |
366 | /// Determine whether this declaration can be redeclared in a |
367 | /// different translation unit. |
368 | bool isExternallyDeclarable() const { |
369 | return isExternallyVisible() && !getOwningModuleForLinkage(); |
370 | } |
371 | |
372 | /// Determines the visibility of this entity. |
373 | Visibility getVisibility() const { |
374 | return getLinkageAndVisibility().getVisibility(); |
375 | } |
376 | |
377 | /// Determines the linkage and visibility of this entity. |
378 | LinkageInfo getLinkageAndVisibility() const; |
379 | |
380 | /// Kinds of explicit visibility. |
381 | enum ExplicitVisibilityKind { |
382 | /// Do an LV computation for, ultimately, a type. |
383 | /// Visibility may be restricted by type visibility settings and |
384 | /// the visibility of template arguments. |
385 | VisibilityForType, |
386 | |
387 | /// Do an LV computation for, ultimately, a non-type declaration. |
388 | /// Visibility may be restricted by value visibility settings and |
389 | /// the visibility of template arguments. |
390 | VisibilityForValue |
391 | }; |
392 | |
393 | /// If visibility was explicitly specified for this |
394 | /// declaration, return that visibility. |
395 | Optional<Visibility> |
396 | getExplicitVisibility(ExplicitVisibilityKind kind) const; |
397 | |
398 | /// True if the computed linkage is valid. Used for consistency |
399 | /// checking. Should always return true. |
400 | bool isLinkageValid() const; |
401 | |
402 | /// True if something has required us to compute the linkage |
403 | /// of this declaration. |
404 | /// |
405 | /// Language features which can retroactively change linkage (like a |
406 | /// typedef name for linkage purposes) may need to consider this, |
407 | /// but hopefully only in transitory ways during parsing. |
408 | bool hasLinkageBeenComputed() const { |
409 | return hasCachedLinkage(); |
410 | } |
411 | |
412 | /// Looks through UsingDecls and ObjCCompatibleAliasDecls for |
413 | /// the underlying named decl. |
414 | NamedDecl *getUnderlyingDecl() { |
415 | // Fast-path the common case. |
416 | if (this->getKind() != UsingShadow && |
417 | this->getKind() != ConstructorUsingShadow && |
418 | this->getKind() != ObjCCompatibleAlias && |
419 | this->getKind() != NamespaceAlias) |
420 | return this; |
421 | |
422 | return getUnderlyingDeclImpl(); |
423 | } |
424 | const NamedDecl *getUnderlyingDecl() const { |
425 | return const_cast<NamedDecl*>(this)->getUnderlyingDecl(); |
426 | } |
427 | |
428 | NamedDecl *getMostRecentDecl() { |
429 | return cast<NamedDecl>(static_cast<Decl *>(this)->getMostRecentDecl()); |
430 | } |
431 | const NamedDecl *getMostRecentDecl() const { |
432 | return const_cast<NamedDecl*>(this)->getMostRecentDecl(); |
433 | } |
434 | |
435 | ObjCStringFormatFamily getObjCFStringFormattingFamily() const; |
436 | |
437 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
438 | static bool classofKind(Kind K) { return K >= firstNamed && K <= lastNamed; } |
439 | }; |
440 | |
441 | inline raw_ostream &operator<<(raw_ostream &OS, const NamedDecl &ND) { |
442 | ND.printName(OS); |
443 | return OS; |
444 | } |
445 | |
446 | /// Represents the declaration of a label. Labels also have a |
447 | /// corresponding LabelStmt, which indicates the position that the label was |
448 | /// defined at. For normal labels, the location of the decl is the same as the |
449 | /// location of the statement. For GNU local labels (__label__), the decl |
450 | /// location is where the __label__ is. |
451 | class LabelDecl : public NamedDecl { |
452 | LabelStmt *TheStmt; |
453 | StringRef MSAsmName; |
454 | bool MSAsmNameResolved = false; |
455 | |
456 | /// For normal labels, this is the same as the main declaration |
457 | /// label, i.e., the location of the identifier; for GNU local labels, |
458 | /// this is the location of the __label__ keyword. |
459 | SourceLocation LocStart; |
460 | |
461 | LabelDecl(DeclContext *DC, SourceLocation IdentL, IdentifierInfo *II, |
462 | LabelStmt *S, SourceLocation StartL) |
463 | : NamedDecl(Label, DC, IdentL, II), TheStmt(S), LocStart(StartL) {} |
464 | |
465 | void anchor() override; |
466 | |
467 | public: |
468 | static LabelDecl *Create(ASTContext &C, DeclContext *DC, |
469 | SourceLocation IdentL, IdentifierInfo *II); |
470 | static LabelDecl *Create(ASTContext &C, DeclContext *DC, |
471 | SourceLocation IdentL, IdentifierInfo *II, |
472 | SourceLocation GnuLabelL); |
473 | static LabelDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
474 | |
475 | LabelStmt *getStmt() const { return TheStmt; } |
476 | void setStmt(LabelStmt *T) { TheStmt = T; } |
477 | |
478 | bool isGnuLocal() const { return LocStart != getLocation(); } |
479 | void setLocStart(SourceLocation L) { LocStart = L; } |
480 | |
481 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) { |
482 | return SourceRange(LocStart, getLocation()); |
483 | } |
484 | |
485 | bool isMSAsmLabel() const { return !MSAsmName.empty(); } |
486 | bool isResolvedMSAsmLabel() const { return isMSAsmLabel() && MSAsmNameResolved; } |
487 | void setMSAsmLabel(StringRef Name); |
488 | StringRef getMSAsmLabel() const { return MSAsmName; } |
489 | void setMSAsmLabelResolved() { MSAsmNameResolved = true; } |
490 | |
491 | // Implement isa/cast/dyncast/etc. |
492 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
493 | static bool classofKind(Kind K) { return K == Label; } |
494 | }; |
495 | |
496 | /// Represent a C++ namespace. |
497 | class NamespaceDecl : public NamedDecl, public DeclContext, |
498 | public Redeclarable<NamespaceDecl> |
499 | { |
500 | /// The starting location of the source range, pointing |
501 | /// to either the namespace or the inline keyword. |
502 | SourceLocation LocStart; |
503 | |
504 | /// The ending location of the source range. |
505 | SourceLocation RBraceLoc; |
506 | |
507 | /// A pointer to either the anonymous namespace that lives just inside |
508 | /// this namespace or to the first namespace in the chain (the latter case |
509 | /// only when this is not the first in the chain), along with a |
510 | /// boolean value indicating whether this is an inline namespace. |
511 | llvm::PointerIntPair<NamespaceDecl *, 1, bool> AnonOrFirstNamespaceAndInline; |
512 | |
513 | NamespaceDecl(ASTContext &C, DeclContext *DC, bool Inline, |
514 | SourceLocation StartLoc, SourceLocation IdLoc, |
515 | IdentifierInfo *Id, NamespaceDecl *PrevDecl); |
516 | |
517 | using redeclarable_base = Redeclarable<NamespaceDecl>; |
518 | |
519 | NamespaceDecl *getNextRedeclarationImpl() override; |
520 | NamespaceDecl *getPreviousDeclImpl() override; |
521 | NamespaceDecl *getMostRecentDeclImpl() override; |
522 | |
523 | public: |
524 | friend class ASTDeclReader; |
525 | friend class ASTDeclWriter; |
526 | |
527 | static NamespaceDecl *Create(ASTContext &C, DeclContext *DC, |
528 | bool Inline, SourceLocation StartLoc, |
529 | SourceLocation IdLoc, IdentifierInfo *Id, |
530 | NamespaceDecl *PrevDecl); |
531 | |
532 | static NamespaceDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
533 | |
534 | using redecl_range = redeclarable_base::redecl_range; |
535 | using redecl_iterator = redeclarable_base::redecl_iterator; |
536 | |
537 | using redeclarable_base::redecls_begin; |
538 | using redeclarable_base::redecls_end; |
539 | using redeclarable_base::redecls; |
540 | using redeclarable_base::getPreviousDecl; |
541 | using redeclarable_base::getMostRecentDecl; |
542 | using redeclarable_base::isFirstDecl; |
543 | |
544 | /// Returns true if this is an anonymous namespace declaration. |
545 | /// |
546 | /// For example: |
547 | /// \code |
548 | /// namespace { |
549 | /// ... |
550 | /// }; |
551 | /// \endcode |
552 | /// q.v. C++ [namespace.unnamed] |
553 | bool isAnonymousNamespace() const { |
554 | return !getIdentifier(); |
555 | } |
556 | |
557 | /// Returns true if this is an inline namespace declaration. |
558 | bool isInline() const { |
559 | return AnonOrFirstNamespaceAndInline.getInt(); |
560 | } |
561 | |
562 | /// Set whether this is an inline namespace declaration. |
563 | void setInline(bool Inline) { |
564 | AnonOrFirstNamespaceAndInline.setInt(Inline); |
565 | } |
566 | |
567 | /// Get the original (first) namespace declaration. |
568 | NamespaceDecl *getOriginalNamespace(); |
569 | |
570 | /// Get the original (first) namespace declaration. |
571 | const NamespaceDecl *getOriginalNamespace() const; |
572 | |
573 | /// Return true if this declaration is an original (first) declaration |
574 | /// of the namespace. This is false for non-original (subsequent) namespace |
575 | /// declarations and anonymous namespaces. |
576 | bool isOriginalNamespace() const; |
577 | |
578 | /// Retrieve the anonymous namespace nested inside this namespace, |
579 | /// if any. |
580 | NamespaceDecl *getAnonymousNamespace() const { |
581 | return getOriginalNamespace()->AnonOrFirstNamespaceAndInline.getPointer(); |
582 | } |
583 | |
584 | void setAnonymousNamespace(NamespaceDecl *D) { |
585 | getOriginalNamespace()->AnonOrFirstNamespaceAndInline.setPointer(D); |
586 | } |
587 | |
588 | /// Retrieves the canonical declaration of this namespace. |
589 | NamespaceDecl *getCanonicalDecl() override { |
590 | return getOriginalNamespace(); |
591 | } |
592 | const NamespaceDecl *getCanonicalDecl() const { |
593 | return getOriginalNamespace(); |
594 | } |
595 | |
596 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) { |
597 | return SourceRange(LocStart, RBraceLoc); |
598 | } |
599 | |
600 | SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return LocStart; } |
601 | SourceLocation getRBraceLoc() const { return RBraceLoc; } |
602 | void setLocStart(SourceLocation L) { LocStart = L; } |
603 | void setRBraceLoc(SourceLocation L) { RBraceLoc = L; } |
604 | |
605 | // Implement isa/cast/dyncast/etc. |
606 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
607 | static bool classofKind(Kind K) { return K == Namespace; } |
608 | static DeclContext *castToDeclContext(const NamespaceDecl *D) { |
609 | return static_cast<DeclContext *>(const_cast<NamespaceDecl*>(D)); |
610 | } |
611 | static NamespaceDecl *castFromDeclContext(const DeclContext *DC) { |
612 | return static_cast<NamespaceDecl *>(const_cast<DeclContext*>(DC)); |
613 | } |
614 | }; |
615 | |
616 | /// Represent the declaration of a variable (in which case it is |
617 | /// an lvalue) a function (in which case it is a function designator) or |
618 | /// an enum constant. |
619 | class ValueDecl : public NamedDecl { |
620 | QualType DeclType; |
621 | |
622 | void anchor() override; |
623 | |
624 | protected: |
625 | ValueDecl(Kind DK, DeclContext *DC, SourceLocation L, |
626 | DeclarationName N, QualType T) |
627 | : NamedDecl(DK, DC, L, N), DeclType(T) {} |
628 | |
629 | public: |
630 | QualType getType() const { return DeclType; } |
631 | void setType(QualType newType) { DeclType = newType; } |
632 | |
633 | /// Determine whether this symbol is weakly-imported, |
634 | /// or declared with the weak or weak-ref attr. |
635 | bool isWeak() const; |
636 | |
637 | // Implement isa/cast/dyncast/etc. |
638 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
639 | static bool classofKind(Kind K) { return K >= firstValue && K <= lastValue; } |
640 | }; |
641 | |
642 | /// A struct with extended info about a syntactic |
643 | /// name qualifier, to be used for the case of out-of-line declarations. |
644 | struct QualifierInfo { |
645 | NestedNameSpecifierLoc QualifierLoc; |
646 | |
647 | /// The number of "outer" template parameter lists. |
648 | /// The count includes all of the template parameter lists that were matched |
649 | /// against the template-ids occurring into the NNS and possibly (in the |
650 | /// case of an explicit specialization) a final "template <>". |
651 | unsigned NumTemplParamLists = 0; |
652 | |
653 | /// A new-allocated array of size NumTemplParamLists, |
654 | /// containing pointers to the "outer" template parameter lists. |
655 | /// It includes all of the template parameter lists that were matched |
656 | /// against the template-ids occurring into the NNS and possibly (in the |
657 | /// case of an explicit specialization) a final "template <>". |
658 | TemplateParameterList** TemplParamLists = nullptr; |
659 | |
660 | QualifierInfo() = default; |
661 | QualifierInfo(const QualifierInfo &) = delete; |
662 | QualifierInfo& operator=(const QualifierInfo &) = delete; |
663 | |
664 | /// Sets info about "outer" template parameter lists. |
665 | void setTemplateParameterListsInfo(ASTContext &Context, |
666 | ArrayRef<TemplateParameterList *> TPLists); |
667 | }; |
668 | |
669 | /// Represents a ValueDecl that came out of a declarator. |
670 | /// Contains type source information through TypeSourceInfo. |
671 | class DeclaratorDecl : public ValueDecl { |
672 | // A struct representing a TInfo, a trailing requires-clause and a syntactic |
673 | // qualifier, to be used for the (uncommon) case of out-of-line declarations |
674 | // and constrained function decls. |
675 | struct ExtInfo : public QualifierInfo { |
676 | TypeSourceInfo *TInfo; |
677 | Expr *TrailingRequiresClause = nullptr; |
678 | }; |
679 | |
680 | llvm::PointerUnion<TypeSourceInfo *, ExtInfo *> DeclInfo; |
681 | |
682 | /// The start of the source range for this declaration, |
683 | /// ignoring outer template declarations. |
684 | SourceLocation InnerLocStart; |
685 | |
686 | bool hasExtInfo() const { return DeclInfo.is<ExtInfo*>(); } |
687 | ExtInfo *getExtInfo() { return DeclInfo.get<ExtInfo*>(); } |
688 | const ExtInfo *getExtInfo() const { return DeclInfo.get<ExtInfo*>(); } |
689 | |
690 | protected: |
691 | DeclaratorDecl(Kind DK, DeclContext *DC, SourceLocation L, |
692 | DeclarationName N, QualType T, TypeSourceInfo *TInfo, |
693 | SourceLocation StartL) |
694 | : ValueDecl(DK, DC, L, N, T), DeclInfo(TInfo), InnerLocStart(StartL) {} |
695 | |
696 | public: |
697 | friend class ASTDeclReader; |
698 | friend class ASTDeclWriter; |
699 | |
700 | TypeSourceInfo *getTypeSourceInfo() const { |
701 | return hasExtInfo() |
702 | ? getExtInfo()->TInfo |
703 | : DeclInfo.get<TypeSourceInfo*>(); |
704 | } |
705 | |
706 | void setTypeSourceInfo(TypeSourceInfo *TI) { |
707 | if (hasExtInfo()) |
708 | getExtInfo()->TInfo = TI; |
709 | else |
710 | DeclInfo = TI; |
711 | } |
712 | |
713 | /// Return start of source range ignoring outer template declarations. |
714 | SourceLocation getInnerLocStart() const { return InnerLocStart; } |
715 | void setInnerLocStart(SourceLocation L) { InnerLocStart = L; } |
716 | |
717 | /// Return start of source range taking into account any outer template |
718 | /// declarations. |
719 | SourceLocation getOuterLocStart() const; |
720 | |
721 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
722 | |
723 | SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { |
724 | return getOuterLocStart(); |
725 | } |
726 | |
727 | /// Retrieve the nested-name-specifier that qualifies the name of this |
728 | /// declaration, if it was present in the source. |
729 | NestedNameSpecifier *getQualifier() const { |
730 | return hasExtInfo() ? getExtInfo()->QualifierLoc.getNestedNameSpecifier() |
731 | : nullptr; |
732 | } |
733 | |
734 | /// Retrieve the nested-name-specifier (with source-location |
735 | /// information) that qualifies the name of this declaration, if it was |
736 | /// present in the source. |
737 | NestedNameSpecifierLoc getQualifierLoc() const { |
738 | return hasExtInfo() ? getExtInfo()->QualifierLoc |
739 | : NestedNameSpecifierLoc(); |
740 | } |
741 | |
742 | void setQualifierInfo(NestedNameSpecifierLoc QualifierLoc); |
743 | |
744 | /// \brief Get the constraint-expression introduced by the trailing |
745 | /// requires-clause in the function/member declaration, or null if no |
746 | /// requires-clause was provided. |
747 | Expr *getTrailingRequiresClause() { |
748 | return hasExtInfo() ? getExtInfo()->TrailingRequiresClause |
749 | : nullptr; |
750 | } |
751 | |
752 | const Expr *getTrailingRequiresClause() const { |
753 | return hasExtInfo() ? getExtInfo()->TrailingRequiresClause |
754 | : nullptr; |
755 | } |
756 | |
757 | void setTrailingRequiresClause(Expr *TrailingRequiresClause); |
758 | |
759 | unsigned getNumTemplateParameterLists() const { |
760 | return hasExtInfo() ? getExtInfo()->NumTemplParamLists : 0; |
761 | } |
762 | |
763 | TemplateParameterList *getTemplateParameterList(unsigned index) const { |
764 | assert(index < getNumTemplateParameterLists())((index < getNumTemplateParameterLists()) ? static_cast< void> (0) : __assert_fail ("index < getNumTemplateParameterLists()" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 764, __PRETTY_FUNCTION__)); |
765 | return getExtInfo()->TemplParamLists[index]; |
766 | } |
767 | |
768 | void setTemplateParameterListsInfo(ASTContext &Context, |
769 | ArrayRef<TemplateParameterList *> TPLists); |
770 | |
771 | SourceLocation getTypeSpecStartLoc() const; |
772 | SourceLocation getTypeSpecEndLoc() const; |
773 | |
774 | // Implement isa/cast/dyncast/etc. |
775 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
776 | static bool classofKind(Kind K) { |
777 | return K >= firstDeclarator && K <= lastDeclarator; |
778 | } |
779 | }; |
780 | |
781 | /// Structure used to store a statement, the constant value to |
782 | /// which it was evaluated (if any), and whether or not the statement |
783 | /// is an integral constant expression (if known). |
784 | struct EvaluatedStmt { |
785 | /// Whether this statement was already evaluated. |
786 | bool WasEvaluated : 1; |
787 | |
788 | /// Whether this statement is being evaluated. |
789 | bool IsEvaluating : 1; |
790 | |
791 | /// Whether we already checked whether this statement was an |
792 | /// integral constant expression. |
793 | bool CheckedICE : 1; |
794 | |
795 | /// Whether we are checking whether this statement is an |
796 | /// integral constant expression. |
797 | bool CheckingICE : 1; |
798 | |
799 | /// Whether this statement is an integral constant expression, |
800 | /// or in C++11, whether the statement is a constant expression. Only |
801 | /// valid if CheckedICE is true. |
802 | bool IsICE : 1; |
803 | |
804 | /// Whether this variable is known to have constant destruction. That is, |
805 | /// whether running the destructor on the initial value is a side-effect |
806 | /// (and doesn't inspect any state that might have changed during program |
807 | /// execution). This is currently only computed if the destructor is |
808 | /// non-trivial. |
809 | bool HasConstantDestruction : 1; |
810 | |
811 | Stmt *Value; |
812 | APValue Evaluated; |
813 | |
814 | EvaluatedStmt() |
815 | : WasEvaluated(false), IsEvaluating(false), CheckedICE(false), |
816 | CheckingICE(false), IsICE(false), HasConstantDestruction(false) {} |
817 | }; |
818 | |
819 | /// Represents a variable declaration or definition. |
820 | class VarDecl : public DeclaratorDecl, public Redeclarable<VarDecl> { |
821 | public: |
822 | /// Initialization styles. |
823 | enum InitializationStyle { |
824 | /// C-style initialization with assignment |
825 | CInit, |
826 | |
827 | /// Call-style initialization (C++98) |
828 | CallInit, |
829 | |
830 | /// Direct list-initialization (C++11) |
831 | ListInit |
832 | }; |
833 | |
834 | /// Kinds of thread-local storage. |
835 | enum TLSKind { |
836 | /// Not a TLS variable. |
837 | TLS_None, |
838 | |
839 | /// TLS with a known-constant initializer. |
840 | TLS_Static, |
841 | |
842 | /// TLS with a dynamic initializer. |
843 | TLS_Dynamic |
844 | }; |
845 | |
846 | /// Return the string used to specify the storage class \p SC. |
847 | /// |
848 | /// It is illegal to call this function with SC == None. |
849 | static const char *getStorageClassSpecifierString(StorageClass SC); |
850 | |
851 | protected: |
852 | // A pointer union of Stmt * and EvaluatedStmt *. When an EvaluatedStmt, we |
853 | // have allocated the auxiliary struct of information there. |
854 | // |
855 | // TODO: It is a bit unfortunate to use a PointerUnion inside the VarDecl for |
856 | // this as *many* VarDecls are ParmVarDecls that don't have default |
857 | // arguments. We could save some space by moving this pointer union to be |
858 | // allocated in trailing space when necessary. |
859 | using InitType = llvm::PointerUnion<Stmt *, EvaluatedStmt *>; |
860 | |
861 | /// The initializer for this variable or, for a ParmVarDecl, the |
862 | /// C++ default argument. |
863 | mutable InitType Init; |
864 | |
865 | private: |
866 | friend class ASTDeclReader; |
867 | friend class ASTNodeImporter; |
868 | friend class StmtIteratorBase; |
869 | |
870 | class VarDeclBitfields { |
871 | friend class ASTDeclReader; |
872 | friend class VarDecl; |
873 | |
874 | unsigned SClass : 3; |
875 | unsigned TSCSpec : 2; |
876 | unsigned InitStyle : 2; |
877 | |
878 | /// Whether this variable is an ARC pseudo-__strong variable; see |
879 | /// isARCPseudoStrong() for details. |
880 | unsigned ARCPseudoStrong : 1; |
881 | }; |
882 | enum { NumVarDeclBits = 8 }; |
883 | |
884 | protected: |
885 | enum { NumParameterIndexBits = 8 }; |
886 | |
887 | enum DefaultArgKind { |
888 | DAK_None, |
889 | DAK_Unparsed, |
890 | DAK_Uninstantiated, |
891 | DAK_Normal |
892 | }; |
893 | |
894 | enum { NumScopeDepthOrObjCQualsBits = 7 }; |
895 | |
896 | class ParmVarDeclBitfields { |
897 | friend class ASTDeclReader; |
898 | friend class ParmVarDecl; |
899 | |
900 | unsigned : NumVarDeclBits; |
901 | |
902 | /// Whether this parameter inherits a default argument from a |
903 | /// prior declaration. |
904 | unsigned HasInheritedDefaultArg : 1; |
905 | |
906 | /// Describes the kind of default argument for this parameter. By default |
907 | /// this is none. If this is normal, then the default argument is stored in |
908 | /// the \c VarDecl initializer expression unless we were unable to parse |
909 | /// (even an invalid) expression for the default argument. |
910 | unsigned DefaultArgKind : 2; |
911 | |
912 | /// Whether this parameter undergoes K&R argument promotion. |
913 | unsigned IsKNRPromoted : 1; |
914 | |
915 | /// Whether this parameter is an ObjC method parameter or not. |
916 | unsigned IsObjCMethodParam : 1; |
917 | |
918 | /// If IsObjCMethodParam, a Decl::ObjCDeclQualifier. |
919 | /// Otherwise, the number of function parameter scopes enclosing |
920 | /// the function parameter scope in which this parameter was |
921 | /// declared. |
922 | unsigned ScopeDepthOrObjCQuals : NumScopeDepthOrObjCQualsBits; |
923 | |
924 | /// The number of parameters preceding this parameter in the |
925 | /// function parameter scope in which it was declared. |
926 | unsigned ParameterIndex : NumParameterIndexBits; |
927 | }; |
928 | |
929 | class NonParmVarDeclBitfields { |
930 | friend class ASTDeclReader; |
931 | friend class ImplicitParamDecl; |
932 | friend class VarDecl; |
933 | |
934 | unsigned : NumVarDeclBits; |
935 | |
936 | // FIXME: We need something similar to CXXRecordDecl::DefinitionData. |
937 | /// Whether this variable is a definition which was demoted due to |
938 | /// module merge. |
939 | unsigned IsThisDeclarationADemotedDefinition : 1; |
940 | |
941 | /// Whether this variable is the exception variable in a C++ catch |
942 | /// or an Objective-C @catch statement. |
943 | unsigned ExceptionVar : 1; |
944 | |
945 | /// Whether this local variable could be allocated in the return |
946 | /// slot of its function, enabling the named return value optimization |
947 | /// (NRVO). |
948 | unsigned NRVOVariable : 1; |
949 | |
950 | /// Whether this variable is the for-range-declaration in a C++0x |
951 | /// for-range statement. |
952 | unsigned CXXForRangeDecl : 1; |
953 | |
954 | /// Whether this variable is the for-in loop declaration in Objective-C. |
955 | unsigned ObjCForDecl : 1; |
956 | |
957 | /// Whether this variable is (C++1z) inline. |
958 | unsigned IsInline : 1; |
959 | |
960 | /// Whether this variable has (C++1z) inline explicitly specified. |
961 | unsigned IsInlineSpecified : 1; |
962 | |
963 | /// Whether this variable is (C++0x) constexpr. |
964 | unsigned IsConstexpr : 1; |
965 | |
966 | /// Whether this variable is the implicit variable for a lambda |
967 | /// init-capture. |
968 | unsigned IsInitCapture : 1; |
969 | |
970 | /// Whether this local extern variable's previous declaration was |
971 | /// declared in the same block scope. This controls whether we should merge |
972 | /// the type of this declaration with its previous declaration. |
973 | unsigned PreviousDeclInSameBlockScope : 1; |
974 | |
975 | /// Defines kind of the ImplicitParamDecl: 'this', 'self', 'vtt', '_cmd' or |
976 | /// something else. |
977 | unsigned ImplicitParamKind : 3; |
978 | |
979 | unsigned EscapingByref : 1; |
980 | }; |
981 | |
982 | union { |
983 | unsigned AllBits; |
984 | VarDeclBitfields VarDeclBits; |
985 | ParmVarDeclBitfields ParmVarDeclBits; |
986 | NonParmVarDeclBitfields NonParmVarDeclBits; |
987 | }; |
988 | |
989 | VarDecl(Kind DK, ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
990 | SourceLocation IdLoc, IdentifierInfo *Id, QualType T, |
991 | TypeSourceInfo *TInfo, StorageClass SC); |
992 | |
993 | using redeclarable_base = Redeclarable<VarDecl>; |
994 | |
995 | VarDecl *getNextRedeclarationImpl() override { |
996 | return getNextRedeclaration(); |
997 | } |
998 | |
999 | VarDecl *getPreviousDeclImpl() override { |
1000 | return getPreviousDecl(); |
1001 | } |
1002 | |
1003 | VarDecl *getMostRecentDeclImpl() override { |
1004 | return getMostRecentDecl(); |
1005 | } |
1006 | |
1007 | public: |
1008 | using redecl_range = redeclarable_base::redecl_range; |
1009 | using redecl_iterator = redeclarable_base::redecl_iterator; |
1010 | |
1011 | using redeclarable_base::redecls_begin; |
1012 | using redeclarable_base::redecls_end; |
1013 | using redeclarable_base::redecls; |
1014 | using redeclarable_base::getPreviousDecl; |
1015 | using redeclarable_base::getMostRecentDecl; |
1016 | using redeclarable_base::isFirstDecl; |
1017 | |
1018 | static VarDecl *Create(ASTContext &C, DeclContext *DC, |
1019 | SourceLocation StartLoc, SourceLocation IdLoc, |
1020 | IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo, |
1021 | StorageClass S); |
1022 | |
1023 | static VarDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
1024 | |
1025 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
1026 | |
1027 | /// Returns the storage class as written in the source. For the |
1028 | /// computed linkage of symbol, see getLinkage. |
1029 | StorageClass getStorageClass() const { |
1030 | return (StorageClass) VarDeclBits.SClass; |
1031 | } |
1032 | void setStorageClass(StorageClass SC); |
1033 | |
1034 | void setTSCSpec(ThreadStorageClassSpecifier TSC) { |
1035 | VarDeclBits.TSCSpec = TSC; |
1036 | assert(VarDeclBits.TSCSpec == TSC && "truncation")((VarDeclBits.TSCSpec == TSC && "truncation") ? static_cast <void> (0) : __assert_fail ("VarDeclBits.TSCSpec == TSC && \"truncation\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 1036, __PRETTY_FUNCTION__)); |
1037 | } |
1038 | ThreadStorageClassSpecifier getTSCSpec() const { |
1039 | return static_cast<ThreadStorageClassSpecifier>(VarDeclBits.TSCSpec); |
1040 | } |
1041 | TLSKind getTLSKind() const; |
1042 | |
1043 | /// Returns true if a variable with function scope is a non-static local |
1044 | /// variable. |
1045 | bool hasLocalStorage() const { |
1046 | if (getStorageClass() == SC_None) { |
1047 | // OpenCL v1.2 s6.5.3: The __constant or constant address space name is |
1048 | // used to describe variables allocated in global memory and which are |
1049 | // accessed inside a kernel(s) as read-only variables. As such, variables |
1050 | // in constant address space cannot have local storage. |
1051 | if (getType().getAddressSpace() == LangAS::opencl_constant) |
1052 | return false; |
1053 | // Second check is for C++11 [dcl.stc]p4. |
1054 | return !isFileVarDecl() && getTSCSpec() == TSCS_unspecified; |
1055 | } |
1056 | |
1057 | // Global Named Register (GNU extension) |
1058 | if (getStorageClass() == SC_Register && !isLocalVarDeclOrParm()) |
1059 | return false; |
1060 | |
1061 | // Return true for: Auto, Register. |
1062 | // Return false for: Extern, Static, PrivateExtern, OpenCLWorkGroupLocal. |
1063 | |
1064 | return getStorageClass() >= SC_Auto; |
1065 | } |
1066 | |
1067 | /// Returns true if a variable with function scope is a static local |
1068 | /// variable. |
1069 | bool isStaticLocal() const { |
1070 | return (getStorageClass() == SC_Static || |
1071 | // C++11 [dcl.stc]p4 |
1072 | (getStorageClass() == SC_None && getTSCSpec() == TSCS_thread_local)) |
1073 | && !isFileVarDecl(); |
1074 | } |
1075 | |
1076 | /// Returns true if a variable has extern or __private_extern__ |
1077 | /// storage. |
1078 | bool hasExternalStorage() const { |
1079 | return getStorageClass() == SC_Extern || |
1080 | getStorageClass() == SC_PrivateExtern; |
1081 | } |
1082 | |
1083 | /// Returns true for all variables that do not have local storage. |
1084 | /// |
1085 | /// This includes all global variables as well as static variables declared |
1086 | /// within a function. |
1087 | bool hasGlobalStorage() const { return !hasLocalStorage(); } |
1088 | |
1089 | /// Get the storage duration of this variable, per C++ [basic.stc]. |
1090 | StorageDuration getStorageDuration() const { |
1091 | return hasLocalStorage() ? SD_Automatic : |
1092 | getTSCSpec() ? SD_Thread : SD_Static; |
1093 | } |
1094 | |
1095 | /// Compute the language linkage. |
1096 | LanguageLinkage getLanguageLinkage() const; |
1097 | |
1098 | /// Determines whether this variable is a variable with external, C linkage. |
1099 | bool isExternC() const; |
1100 | |
1101 | /// Determines whether this variable's context is, or is nested within, |
1102 | /// a C++ extern "C" linkage spec. |
1103 | bool isInExternCContext() const; |
1104 | |
1105 | /// Determines whether this variable's context is, or is nested within, |
1106 | /// a C++ extern "C++" linkage spec. |
1107 | bool isInExternCXXContext() const; |
1108 | |
1109 | /// Returns true for local variable declarations other than parameters. |
1110 | /// Note that this includes static variables inside of functions. It also |
1111 | /// includes variables inside blocks. |
1112 | /// |
1113 | /// void foo() { int x; static int y; extern int z; } |
1114 | bool isLocalVarDecl() const { |
1115 | if (getKind() != Decl::Var && getKind() != Decl::Decomposition) |
1116 | return false; |
1117 | if (const DeclContext *DC = getLexicalDeclContext()) |
1118 | return DC->getRedeclContext()->isFunctionOrMethod(); |
1119 | return false; |
1120 | } |
1121 | |
1122 | /// Similar to isLocalVarDecl but also includes parameters. |
1123 | bool isLocalVarDeclOrParm() const { |
1124 | return isLocalVarDecl() || getKind() == Decl::ParmVar; |
1125 | } |
1126 | |
1127 | /// Similar to isLocalVarDecl, but excludes variables declared in blocks. |
1128 | bool isFunctionOrMethodVarDecl() const { |
1129 | if (getKind() != Decl::Var && getKind() != Decl::Decomposition) |
1130 | return false; |
1131 | const DeclContext *DC = getLexicalDeclContext()->getRedeclContext(); |
1132 | return DC->isFunctionOrMethod() && DC->getDeclKind() != Decl::Block; |
1133 | } |
1134 | |
1135 | /// Determines whether this is a static data member. |
1136 | /// |
1137 | /// This will only be true in C++, and applies to, e.g., the |
1138 | /// variable 'x' in: |
1139 | /// \code |
1140 | /// struct S { |
1141 | /// static int x; |
1142 | /// }; |
1143 | /// \endcode |
1144 | bool isStaticDataMember() const { |
1145 | // If it wasn't static, it would be a FieldDecl. |
1146 | return getKind() != Decl::ParmVar && getDeclContext()->isRecord(); |
1147 | } |
1148 | |
1149 | VarDecl *getCanonicalDecl() override; |
1150 | const VarDecl *getCanonicalDecl() const { |
1151 | return const_cast<VarDecl*>(this)->getCanonicalDecl(); |
1152 | } |
1153 | |
1154 | enum DefinitionKind { |
1155 | /// This declaration is only a declaration. |
1156 | DeclarationOnly, |
1157 | |
1158 | /// This declaration is a tentative definition. |
1159 | TentativeDefinition, |
1160 | |
1161 | /// This declaration is definitely a definition. |
1162 | Definition |
1163 | }; |
1164 | |
1165 | /// Check whether this declaration is a definition. If this could be |
1166 | /// a tentative definition (in C), don't check whether there's an overriding |
1167 | /// definition. |
1168 | DefinitionKind isThisDeclarationADefinition(ASTContext &) const; |
1169 | DefinitionKind isThisDeclarationADefinition() const { |
1170 | return isThisDeclarationADefinition(getASTContext()); |
1171 | } |
1172 | |
1173 | /// Check whether this variable is defined in this translation unit. |
1174 | DefinitionKind hasDefinition(ASTContext &) const; |
1175 | DefinitionKind hasDefinition() const { |
1176 | return hasDefinition(getASTContext()); |
1177 | } |
1178 | |
1179 | /// Get the tentative definition that acts as the real definition in a TU. |
1180 | /// Returns null if there is a proper definition available. |
1181 | VarDecl *getActingDefinition(); |
1182 | const VarDecl *getActingDefinition() const { |
1183 | return const_cast<VarDecl*>(this)->getActingDefinition(); |
1184 | } |
1185 | |
1186 | /// Get the real (not just tentative) definition for this declaration. |
1187 | VarDecl *getDefinition(ASTContext &); |
1188 | const VarDecl *getDefinition(ASTContext &C) const { |
1189 | return const_cast<VarDecl*>(this)->getDefinition(C); |
1190 | } |
1191 | VarDecl *getDefinition() { |
1192 | return getDefinition(getASTContext()); |
1193 | } |
1194 | const VarDecl *getDefinition() const { |
1195 | return const_cast<VarDecl*>(this)->getDefinition(); |
1196 | } |
1197 | |
1198 | /// Determine whether this is or was instantiated from an out-of-line |
1199 | /// definition of a static data member. |
1200 | bool isOutOfLine() const override; |
1201 | |
1202 | /// Returns true for file scoped variable declaration. |
1203 | bool isFileVarDecl() const { |
1204 | Kind K = getKind(); |
1205 | if (K == ParmVar || K == ImplicitParam) |
1206 | return false; |
1207 | |
1208 | if (getLexicalDeclContext()->getRedeclContext()->isFileContext()) |
1209 | return true; |
1210 | |
1211 | if (isStaticDataMember()) |
1212 | return true; |
1213 | |
1214 | return false; |
1215 | } |
1216 | |
1217 | /// Get the initializer for this variable, no matter which |
1218 | /// declaration it is attached to. |
1219 | const Expr *getAnyInitializer() const { |
1220 | const VarDecl *D; |
1221 | return getAnyInitializer(D); |
1222 | } |
1223 | |
1224 | /// Get the initializer for this variable, no matter which |
1225 | /// declaration it is attached to. Also get that declaration. |
1226 | const Expr *getAnyInitializer(const VarDecl *&D) const; |
1227 | |
1228 | bool hasInit() const; |
1229 | const Expr *getInit() const { |
1230 | return const_cast<VarDecl *>(this)->getInit(); |
1231 | } |
1232 | Expr *getInit(); |
1233 | |
1234 | /// Retrieve the address of the initializer expression. |
1235 | Stmt **getInitAddress(); |
1236 | |
1237 | void setInit(Expr *I); |
1238 | |
1239 | /// Get the initializing declaration of this variable, if any. This is |
1240 | /// usually the definition, except that for a static data member it can be |
1241 | /// the in-class declaration. |
1242 | VarDecl *getInitializingDeclaration(); |
1243 | const VarDecl *getInitializingDeclaration() const { |
1244 | return const_cast<VarDecl *>(this)->getInitializingDeclaration(); |
1245 | } |
1246 | |
1247 | /// Determine whether this variable's value might be usable in a |
1248 | /// constant expression, according to the relevant language standard. |
1249 | /// This only checks properties of the declaration, and does not check |
1250 | /// whether the initializer is in fact a constant expression. |
1251 | bool mightBeUsableInConstantExpressions(ASTContext &C) const; |
1252 | |
1253 | /// Determine whether this variable's value can be used in a |
1254 | /// constant expression, according to the relevant language standard, |
1255 | /// including checking whether it was initialized by a constant expression. |
1256 | bool isUsableInConstantExpressions(ASTContext &C) const; |
1257 | |
1258 | EvaluatedStmt *ensureEvaluatedStmt() const; |
1259 | |
1260 | /// Attempt to evaluate the value of the initializer attached to this |
1261 | /// declaration, and produce notes explaining why it cannot be evaluated or is |
1262 | /// not a constant expression. Returns a pointer to the value if evaluation |
1263 | /// succeeded, 0 otherwise. |
1264 | APValue *evaluateValue() const; |
1265 | APValue *evaluateValue(SmallVectorImpl<PartialDiagnosticAt> &Notes) const; |
1266 | |
1267 | /// Return the already-evaluated value of this variable's |
1268 | /// initializer, or NULL if the value is not yet known. Returns pointer |
1269 | /// to untyped APValue if the value could not be evaluated. |
1270 | APValue *getEvaluatedValue() const; |
1271 | |
1272 | /// Evaluate the destruction of this variable to determine if it constitutes |
1273 | /// constant destruction. |
1274 | /// |
1275 | /// \pre isInitICE() |
1276 | /// \return \c true if this variable has constant destruction, \c false if |
1277 | /// not. |
1278 | bool evaluateDestruction(SmallVectorImpl<PartialDiagnosticAt> &Notes) const; |
1279 | |
1280 | /// Determines whether it is already known whether the |
1281 | /// initializer is an integral constant expression or not. |
1282 | bool isInitKnownICE() const; |
1283 | |
1284 | /// Determines whether the initializer is an integral constant |
1285 | /// expression, or in C++11, whether the initializer is a constant |
1286 | /// expression. |
1287 | /// |
1288 | /// \pre isInitKnownICE() |
1289 | bool isInitICE() const; |
1290 | |
1291 | /// Determine whether the value of the initializer attached to this |
1292 | /// declaration is an integral constant expression. |
1293 | bool checkInitIsICE() const; |
1294 | |
1295 | void setInitStyle(InitializationStyle Style) { |
1296 | VarDeclBits.InitStyle = Style; |
1297 | } |
1298 | |
1299 | /// The style of initialization for this declaration. |
1300 | /// |
1301 | /// C-style initialization is "int x = 1;". Call-style initialization is |
1302 | /// a C++98 direct-initializer, e.g. "int x(1);". The Init expression will be |
1303 | /// the expression inside the parens or a "ClassType(a,b,c)" class constructor |
1304 | /// expression for class types. List-style initialization is C++11 syntax, |
1305 | /// e.g. "int x{1};". Clients can distinguish between different forms of |
1306 | /// initialization by checking this value. In particular, "int x = {1};" is |
1307 | /// C-style, "int x({1})" is call-style, and "int x{1};" is list-style; the |
1308 | /// Init expression in all three cases is an InitListExpr. |
1309 | InitializationStyle getInitStyle() const { |
1310 | return static_cast<InitializationStyle>(VarDeclBits.InitStyle); |
1311 | } |
1312 | |
1313 | /// Whether the initializer is a direct-initializer (list or call). |
1314 | bool isDirectInit() const { |
1315 | return getInitStyle() != CInit; |
1316 | } |
1317 | |
1318 | /// If this definition should pretend to be a declaration. |
1319 | bool isThisDeclarationADemotedDefinition() const { |
1320 | return isa<ParmVarDecl>(this) ? false : |
1321 | NonParmVarDeclBits.IsThisDeclarationADemotedDefinition; |
1322 | } |
1323 | |
1324 | /// This is a definition which should be demoted to a declaration. |
1325 | /// |
1326 | /// In some cases (mostly module merging) we can end up with two visible |
1327 | /// definitions one of which needs to be demoted to a declaration to keep |
1328 | /// the AST invariants. |
1329 | void demoteThisDefinitionToDeclaration() { |
1330 | assert(isThisDeclarationADefinition() && "Not a definition!")((isThisDeclarationADefinition() && "Not a definition!" ) ? static_cast<void> (0) : __assert_fail ("isThisDeclarationADefinition() && \"Not a definition!\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 1330, __PRETTY_FUNCTION__)); |
1331 | 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-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 1331, __PRETTY_FUNCTION__)); |
1332 | NonParmVarDeclBits.IsThisDeclarationADemotedDefinition = 1; |
1333 | } |
1334 | |
1335 | /// Determine whether this variable is the exception variable in a |
1336 | /// C++ catch statememt or an Objective-C \@catch statement. |
1337 | bool isExceptionVariable() const { |
1338 | return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.ExceptionVar; |
1339 | } |
1340 | void setExceptionVariable(bool EV) { |
1341 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 1341, __PRETTY_FUNCTION__)); |
1342 | NonParmVarDeclBits.ExceptionVar = EV; |
1343 | } |
1344 | |
1345 | /// Determine whether this local variable can be used with the named |
1346 | /// return value optimization (NRVO). |
1347 | /// |
1348 | /// The named return value optimization (NRVO) works by marking certain |
1349 | /// non-volatile local variables of class type as NRVO objects. These |
1350 | /// locals can be allocated within the return slot of their containing |
1351 | /// function, in which case there is no need to copy the object to the |
1352 | /// return slot when returning from the function. Within the function body, |
1353 | /// each return that returns the NRVO object will have this variable as its |
1354 | /// NRVO candidate. |
1355 | bool isNRVOVariable() const { |
1356 | return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.NRVOVariable; |
1357 | } |
1358 | void setNRVOVariable(bool NRVO) { |
1359 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 1359, __PRETTY_FUNCTION__)); |
1360 | NonParmVarDeclBits.NRVOVariable = NRVO; |
1361 | } |
1362 | |
1363 | /// Determine whether this variable is the for-range-declaration in |
1364 | /// a C++0x for-range statement. |
1365 | bool isCXXForRangeDecl() const { |
1366 | return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.CXXForRangeDecl; |
1367 | } |
1368 | void setCXXForRangeDecl(bool FRD) { |
1369 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 1369, __PRETTY_FUNCTION__)); |
1370 | NonParmVarDeclBits.CXXForRangeDecl = FRD; |
1371 | } |
1372 | |
1373 | /// Determine whether this variable is a for-loop declaration for a |
1374 | /// for-in statement in Objective-C. |
1375 | bool isObjCForDecl() const { |
1376 | return NonParmVarDeclBits.ObjCForDecl; |
1377 | } |
1378 | |
1379 | void setObjCForDecl(bool FRD) { |
1380 | NonParmVarDeclBits.ObjCForDecl = FRD; |
1381 | } |
1382 | |
1383 | /// Determine whether this variable is an ARC pseudo-__strong variable. A |
1384 | /// pseudo-__strong variable has a __strong-qualified type but does not |
1385 | /// actually retain the object written into it. Generally such variables are |
1386 | /// also 'const' for safety. There are 3 cases where this will be set, 1) if |
1387 | /// the variable is annotated with the objc_externally_retained attribute, 2) |
1388 | /// if its 'self' in a non-init method, or 3) if its the variable in an for-in |
1389 | /// loop. |
1390 | bool isARCPseudoStrong() const { return VarDeclBits.ARCPseudoStrong; } |
1391 | void setARCPseudoStrong(bool PS) { VarDeclBits.ARCPseudoStrong = PS; } |
1392 | |
1393 | /// Whether this variable is (C++1z) inline. |
1394 | bool isInline() const { |
1395 | return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.IsInline; |
1396 | } |
1397 | bool isInlineSpecified() const { |
1398 | return isa<ParmVarDecl>(this) ? false |
1399 | : NonParmVarDeclBits.IsInlineSpecified; |
1400 | } |
1401 | void setInlineSpecified() { |
1402 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 1402, __PRETTY_FUNCTION__)); |
1403 | NonParmVarDeclBits.IsInline = true; |
1404 | NonParmVarDeclBits.IsInlineSpecified = true; |
1405 | } |
1406 | void setImplicitlyInline() { |
1407 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 1407, __PRETTY_FUNCTION__)); |
1408 | NonParmVarDeclBits.IsInline = true; |
1409 | } |
1410 | |
1411 | /// Whether this variable is (C++11) constexpr. |
1412 | bool isConstexpr() const { |
1413 | return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.IsConstexpr; |
1414 | } |
1415 | void setConstexpr(bool IC) { |
1416 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 1416, __PRETTY_FUNCTION__)); |
1417 | NonParmVarDeclBits.IsConstexpr = IC; |
1418 | } |
1419 | |
1420 | /// Whether this variable is the implicit variable for a lambda init-capture. |
1421 | bool isInitCapture() const { |
1422 | return isa<ParmVarDecl>(this) ? false : NonParmVarDeclBits.IsInitCapture; |
1423 | } |
1424 | void setInitCapture(bool IC) { |
1425 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 1425, __PRETTY_FUNCTION__)); |
1426 | NonParmVarDeclBits.IsInitCapture = IC; |
1427 | } |
1428 | |
1429 | /// Determine whether this variable is actually a function parameter pack or |
1430 | /// init-capture pack. |
1431 | bool isParameterPack() const; |
1432 | |
1433 | /// Whether this local extern variable declaration's previous declaration |
1434 | /// was declared in the same block scope. Only correct in C++. |
1435 | bool isPreviousDeclInSameBlockScope() const { |
1436 | return isa<ParmVarDecl>(this) |
1437 | ? false |
1438 | : NonParmVarDeclBits.PreviousDeclInSameBlockScope; |
1439 | } |
1440 | void setPreviousDeclInSameBlockScope(bool Same) { |
1441 | assert(!isa<ParmVarDecl>(this))((!isa<ParmVarDecl>(this)) ? static_cast<void> (0 ) : __assert_fail ("!isa<ParmVarDecl>(this)", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 1441, __PRETTY_FUNCTION__)); |
1442 | NonParmVarDeclBits.PreviousDeclInSameBlockScope = Same; |
1443 | } |
1444 | |
1445 | /// Indicates the capture is a __block variable that is captured by a block |
1446 | /// that can potentially escape (a block for which BlockDecl::doesNotEscape |
1447 | /// returns false). |
1448 | bool isEscapingByref() const; |
1449 | |
1450 | /// Indicates the capture is a __block variable that is never captured by an |
1451 | /// escaping block. |
1452 | bool isNonEscapingByref() const; |
1453 | |
1454 | void setEscapingByref() { |
1455 | NonParmVarDeclBits.EscapingByref = true; |
1456 | } |
1457 | |
1458 | /// Retrieve the variable declaration from which this variable could |
1459 | /// be instantiated, if it is an instantiation (rather than a non-template). |
1460 | VarDecl *getTemplateInstantiationPattern() const; |
1461 | |
1462 | /// If this variable is an instantiated static data member of a |
1463 | /// class template specialization, returns the templated static data member |
1464 | /// from which it was instantiated. |
1465 | VarDecl *getInstantiatedFromStaticDataMember() const; |
1466 | |
1467 | /// If this variable is an instantiation of a variable template or a |
1468 | /// static data member of a class template, determine what kind of |
1469 | /// template specialization or instantiation this is. |
1470 | TemplateSpecializationKind getTemplateSpecializationKind() const; |
1471 | |
1472 | /// Get the template specialization kind of this variable for the purposes of |
1473 | /// template instantiation. This differs from getTemplateSpecializationKind() |
1474 | /// for an instantiation of a class-scope explicit specialization. |
1475 | TemplateSpecializationKind |
1476 | getTemplateSpecializationKindForInstantiation() const; |
1477 | |
1478 | /// If this variable is an instantiation of a variable template or a |
1479 | /// static data member of a class template, determine its point of |
1480 | /// instantiation. |
1481 | SourceLocation getPointOfInstantiation() const; |
1482 | |
1483 | /// If this variable is an instantiation of a static data member of a |
1484 | /// class template specialization, retrieves the member specialization |
1485 | /// information. |
1486 | MemberSpecializationInfo *getMemberSpecializationInfo() const; |
1487 | |
1488 | /// For a static data member that was instantiated from a static |
1489 | /// data member of a class template, set the template specialiation kind. |
1490 | void setTemplateSpecializationKind(TemplateSpecializationKind TSK, |
1491 | SourceLocation PointOfInstantiation = SourceLocation()); |
1492 | |
1493 | /// Specify that this variable is an instantiation of the |
1494 | /// static data member VD. |
1495 | void setInstantiationOfStaticDataMember(VarDecl *VD, |
1496 | TemplateSpecializationKind TSK); |
1497 | |
1498 | /// Retrieves the variable template that is described by this |
1499 | /// variable declaration. |
1500 | /// |
1501 | /// Every variable template is represented as a VarTemplateDecl and a |
1502 | /// VarDecl. The former contains template properties (such as |
1503 | /// the template parameter lists) while the latter contains the |
1504 | /// actual description of the template's |
1505 | /// contents. VarTemplateDecl::getTemplatedDecl() retrieves the |
1506 | /// VarDecl that from a VarTemplateDecl, while |
1507 | /// getDescribedVarTemplate() retrieves the VarTemplateDecl from |
1508 | /// a VarDecl. |
1509 | VarTemplateDecl *getDescribedVarTemplate() const; |
1510 | |
1511 | void setDescribedVarTemplate(VarTemplateDecl *Template); |
1512 | |
1513 | // Is this variable known to have a definition somewhere in the complete |
1514 | // program? This may be true even if the declaration has internal linkage and |
1515 | // has no definition within this source file. |
1516 | bool isKnownToBeDefined() const; |
1517 | |
1518 | /// Is destruction of this variable entirely suppressed? If so, the variable |
1519 | /// need not have a usable destructor at all. |
1520 | bool isNoDestroy(const ASTContext &) const; |
1521 | |
1522 | /// Would the destruction of this variable have any effect, and if so, what |
1523 | /// kind? |
1524 | QualType::DestructionKind needsDestruction(const ASTContext &Ctx) const; |
1525 | |
1526 | // Implement isa/cast/dyncast/etc. |
1527 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
1528 | static bool classofKind(Kind K) { return K >= firstVar && K <= lastVar; } |
1529 | }; |
1530 | |
1531 | class ImplicitParamDecl : public VarDecl { |
1532 | void anchor() override; |
1533 | |
1534 | public: |
1535 | /// Defines the kind of the implicit parameter: is this an implicit parameter |
1536 | /// with pointer to 'this', 'self', '_cmd', virtual table pointers, captured |
1537 | /// context or something else. |
1538 | enum ImplicitParamKind : unsigned { |
1539 | /// Parameter for Objective-C 'self' argument |
1540 | ObjCSelf, |
1541 | |
1542 | /// Parameter for Objective-C '_cmd' argument |
1543 | ObjCCmd, |
1544 | |
1545 | /// Parameter for C++ 'this' argument |
1546 | CXXThis, |
1547 | |
1548 | /// Parameter for C++ virtual table pointers |
1549 | CXXVTT, |
1550 | |
1551 | /// Parameter for captured context |
1552 | CapturedContext, |
1553 | |
1554 | /// Other implicit parameter |
1555 | Other, |
1556 | }; |
1557 | |
1558 | /// Create implicit parameter. |
1559 | static ImplicitParamDecl *Create(ASTContext &C, DeclContext *DC, |
1560 | SourceLocation IdLoc, IdentifierInfo *Id, |
1561 | QualType T, ImplicitParamKind ParamKind); |
1562 | static ImplicitParamDecl *Create(ASTContext &C, QualType T, |
1563 | ImplicitParamKind ParamKind); |
1564 | |
1565 | static ImplicitParamDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
1566 | |
1567 | ImplicitParamDecl(ASTContext &C, DeclContext *DC, SourceLocation IdLoc, |
1568 | IdentifierInfo *Id, QualType Type, |
1569 | ImplicitParamKind ParamKind) |
1570 | : VarDecl(ImplicitParam, C, DC, IdLoc, IdLoc, Id, Type, |
1571 | /*TInfo=*/nullptr, SC_None) { |
1572 | NonParmVarDeclBits.ImplicitParamKind = ParamKind; |
1573 | setImplicit(); |
1574 | } |
1575 | |
1576 | ImplicitParamDecl(ASTContext &C, QualType Type, ImplicitParamKind ParamKind) |
1577 | : VarDecl(ImplicitParam, C, /*DC=*/nullptr, SourceLocation(), |
1578 | SourceLocation(), /*Id=*/nullptr, Type, |
1579 | /*TInfo=*/nullptr, SC_None) { |
1580 | NonParmVarDeclBits.ImplicitParamKind = ParamKind; |
1581 | setImplicit(); |
1582 | } |
1583 | |
1584 | /// Returns the implicit parameter kind. |
1585 | ImplicitParamKind getParameterKind() const { |
1586 | return static_cast<ImplicitParamKind>(NonParmVarDeclBits.ImplicitParamKind); |
1587 | } |
1588 | |
1589 | // Implement isa/cast/dyncast/etc. |
1590 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
1591 | static bool classofKind(Kind K) { return K == ImplicitParam; } |
1592 | }; |
1593 | |
1594 | /// Represents a parameter to a function. |
1595 | class ParmVarDecl : public VarDecl { |
1596 | public: |
1597 | enum { MaxFunctionScopeDepth = 255 }; |
1598 | enum { MaxFunctionScopeIndex = 255 }; |
1599 | |
1600 | protected: |
1601 | ParmVarDecl(Kind DK, ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
1602 | SourceLocation IdLoc, IdentifierInfo *Id, QualType T, |
1603 | TypeSourceInfo *TInfo, StorageClass S, Expr *DefArg) |
1604 | : VarDecl(DK, C, DC, StartLoc, IdLoc, Id, T, TInfo, S) { |
1605 | assert(ParmVarDeclBits.HasInheritedDefaultArg == false)((ParmVarDeclBits.HasInheritedDefaultArg == false) ? static_cast <void> (0) : __assert_fail ("ParmVarDeclBits.HasInheritedDefaultArg == false" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 1605, __PRETTY_FUNCTION__)); |
1606 | assert(ParmVarDeclBits.DefaultArgKind == DAK_None)((ParmVarDeclBits.DefaultArgKind == DAK_None) ? static_cast< void> (0) : __assert_fail ("ParmVarDeclBits.DefaultArgKind == DAK_None" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 1606, __PRETTY_FUNCTION__)); |
1607 | assert(ParmVarDeclBits.IsKNRPromoted == false)((ParmVarDeclBits.IsKNRPromoted == false) ? static_cast<void > (0) : __assert_fail ("ParmVarDeclBits.IsKNRPromoted == false" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 1607, __PRETTY_FUNCTION__)); |
1608 | assert(ParmVarDeclBits.IsObjCMethodParam == false)((ParmVarDeclBits.IsObjCMethodParam == false) ? static_cast< void> (0) : __assert_fail ("ParmVarDeclBits.IsObjCMethodParam == false" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 1608, __PRETTY_FUNCTION__)); |
1609 | setDefaultArg(DefArg); |
1610 | } |
1611 | |
1612 | public: |
1613 | static ParmVarDecl *Create(ASTContext &C, DeclContext *DC, |
1614 | SourceLocation StartLoc, |
1615 | SourceLocation IdLoc, IdentifierInfo *Id, |
1616 | QualType T, TypeSourceInfo *TInfo, |
1617 | StorageClass S, Expr *DefArg); |
1618 | |
1619 | static ParmVarDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
1620 | |
1621 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
1622 | |
1623 | void setObjCMethodScopeInfo(unsigned parameterIndex) { |
1624 | ParmVarDeclBits.IsObjCMethodParam = true; |
1625 | setParameterIndex(parameterIndex); |
1626 | } |
1627 | |
1628 | void setScopeInfo(unsigned scopeDepth, unsigned parameterIndex) { |
1629 | assert(!ParmVarDeclBits.IsObjCMethodParam)((!ParmVarDeclBits.IsObjCMethodParam) ? static_cast<void> (0) : __assert_fail ("!ParmVarDeclBits.IsObjCMethodParam", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 1629, __PRETTY_FUNCTION__)); |
1630 | |
1631 | ParmVarDeclBits.ScopeDepthOrObjCQuals = scopeDepth; |
1632 | assert(ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth((ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth && "truncation!") ? static_cast<void> (0) : __assert_fail ("ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth && \"truncation!\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 1633, __PRETTY_FUNCTION__)) |
1633 | && "truncation!")((ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth && "truncation!") ? static_cast<void> (0) : __assert_fail ("ParmVarDeclBits.ScopeDepthOrObjCQuals == scopeDepth && \"truncation!\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 1633, __PRETTY_FUNCTION__)); |
1634 | |
1635 | setParameterIndex(parameterIndex); |
1636 | } |
1637 | |
1638 | bool isObjCMethodParameter() const { |
1639 | return ParmVarDeclBits.IsObjCMethodParam; |
1640 | } |
1641 | |
1642 | unsigned getFunctionScopeDepth() const { |
1643 | if (ParmVarDeclBits.IsObjCMethodParam) return 0; |
1644 | return ParmVarDeclBits.ScopeDepthOrObjCQuals; |
1645 | } |
1646 | |
1647 | static constexpr unsigned getMaxFunctionScopeDepth() { |
1648 | return (1u << NumScopeDepthOrObjCQualsBits) - 1; |
1649 | } |
1650 | |
1651 | /// Returns the index of this parameter in its prototype or method scope. |
1652 | unsigned getFunctionScopeIndex() const { |
1653 | return getParameterIndex(); |
1654 | } |
1655 | |
1656 | ObjCDeclQualifier getObjCDeclQualifier() const { |
1657 | if (!ParmVarDeclBits.IsObjCMethodParam) return OBJC_TQ_None; |
1658 | return ObjCDeclQualifier(ParmVarDeclBits.ScopeDepthOrObjCQuals); |
1659 | } |
1660 | void setObjCDeclQualifier(ObjCDeclQualifier QTVal) { |
1661 | assert(ParmVarDeclBits.IsObjCMethodParam)((ParmVarDeclBits.IsObjCMethodParam) ? static_cast<void> (0) : __assert_fail ("ParmVarDeclBits.IsObjCMethodParam", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 1661, __PRETTY_FUNCTION__)); |
1662 | ParmVarDeclBits.ScopeDepthOrObjCQuals = QTVal; |
1663 | } |
1664 | |
1665 | /// True if the value passed to this parameter must undergo |
1666 | /// K&R-style default argument promotion: |
1667 | /// |
1668 | /// C99 6.5.2.2. |
1669 | /// If the expression that denotes the called function has a type |
1670 | /// that does not include a prototype, the integer promotions are |
1671 | /// performed on each argument, and arguments that have type float |
1672 | /// are promoted to double. |
1673 | bool isKNRPromoted() const { |
1674 | return ParmVarDeclBits.IsKNRPromoted; |
1675 | } |
1676 | void setKNRPromoted(bool promoted) { |
1677 | ParmVarDeclBits.IsKNRPromoted = promoted; |
1678 | } |
1679 | |
1680 | Expr *getDefaultArg(); |
1681 | const Expr *getDefaultArg() const { |
1682 | return const_cast<ParmVarDecl *>(this)->getDefaultArg(); |
1683 | } |
1684 | |
1685 | void setDefaultArg(Expr *defarg); |
1686 | |
1687 | /// Retrieve the source range that covers the entire default |
1688 | /// argument. |
1689 | SourceRange getDefaultArgRange() const; |
1690 | void setUninstantiatedDefaultArg(Expr *arg); |
1691 | Expr *getUninstantiatedDefaultArg(); |
1692 | const Expr *getUninstantiatedDefaultArg() const { |
1693 | return const_cast<ParmVarDecl *>(this)->getUninstantiatedDefaultArg(); |
1694 | } |
1695 | |
1696 | /// Determines whether this parameter has a default argument, |
1697 | /// either parsed or not. |
1698 | bool hasDefaultArg() const; |
1699 | |
1700 | /// Determines whether this parameter has a default argument that has not |
1701 | /// yet been parsed. This will occur during the processing of a C++ class |
1702 | /// whose member functions have default arguments, e.g., |
1703 | /// @code |
1704 | /// class X { |
1705 | /// public: |
1706 | /// void f(int x = 17); // x has an unparsed default argument now |
1707 | /// }; // x has a regular default argument now |
1708 | /// @endcode |
1709 | bool hasUnparsedDefaultArg() const { |
1710 | return ParmVarDeclBits.DefaultArgKind == DAK_Unparsed; |
1711 | } |
1712 | |
1713 | bool hasUninstantiatedDefaultArg() const { |
1714 | return ParmVarDeclBits.DefaultArgKind == DAK_Uninstantiated; |
1715 | } |
1716 | |
1717 | /// Specify that this parameter has an unparsed default argument. |
1718 | /// The argument will be replaced with a real default argument via |
1719 | /// setDefaultArg when the class definition enclosing the function |
1720 | /// declaration that owns this default argument is completed. |
1721 | void setUnparsedDefaultArg() { |
1722 | ParmVarDeclBits.DefaultArgKind = DAK_Unparsed; |
1723 | } |
1724 | |
1725 | bool hasInheritedDefaultArg() const { |
1726 | return ParmVarDeclBits.HasInheritedDefaultArg; |
1727 | } |
1728 | |
1729 | void setHasInheritedDefaultArg(bool I = true) { |
1730 | ParmVarDeclBits.HasInheritedDefaultArg = I; |
1731 | } |
1732 | |
1733 | QualType getOriginalType() const; |
1734 | |
1735 | /// Sets the function declaration that owns this |
1736 | /// ParmVarDecl. Since ParmVarDecls are often created before the |
1737 | /// FunctionDecls that own them, this routine is required to update |
1738 | /// the DeclContext appropriately. |
1739 | void setOwningFunction(DeclContext *FD) { setDeclContext(FD); } |
1740 | |
1741 | // Implement isa/cast/dyncast/etc. |
1742 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
1743 | static bool classofKind(Kind K) { return K == ParmVar; } |
1744 | |
1745 | private: |
1746 | enum { ParameterIndexSentinel = (1 << NumParameterIndexBits) - 1 }; |
1747 | |
1748 | void setParameterIndex(unsigned parameterIndex) { |
1749 | if (parameterIndex >= ParameterIndexSentinel) { |
1750 | setParameterIndexLarge(parameterIndex); |
1751 | return; |
1752 | } |
1753 | |
1754 | ParmVarDeclBits.ParameterIndex = parameterIndex; |
1755 | assert(ParmVarDeclBits.ParameterIndex == parameterIndex && "truncation!")((ParmVarDeclBits.ParameterIndex == parameterIndex && "truncation!") ? static_cast<void> (0) : __assert_fail ("ParmVarDeclBits.ParameterIndex == parameterIndex && \"truncation!\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 1755, __PRETTY_FUNCTION__)); |
1756 | } |
1757 | unsigned getParameterIndex() const { |
1758 | unsigned d = ParmVarDeclBits.ParameterIndex; |
1759 | return d == ParameterIndexSentinel ? getParameterIndexLarge() : d; |
1760 | } |
1761 | |
1762 | void setParameterIndexLarge(unsigned parameterIndex); |
1763 | unsigned getParameterIndexLarge() const; |
1764 | }; |
1765 | |
1766 | enum class MultiVersionKind { |
1767 | None, |
1768 | Target, |
1769 | CPUSpecific, |
1770 | CPUDispatch |
1771 | }; |
1772 | |
1773 | /// Represents a function declaration or definition. |
1774 | /// |
1775 | /// Since a given function can be declared several times in a program, |
1776 | /// there may be several FunctionDecls that correspond to that |
1777 | /// function. Only one of those FunctionDecls will be found when |
1778 | /// traversing the list of declarations in the context of the |
1779 | /// FunctionDecl (e.g., the translation unit); this FunctionDecl |
1780 | /// contains all of the information known about the function. Other, |
1781 | /// previous declarations of the function are available via the |
1782 | /// getPreviousDecl() chain. |
1783 | class FunctionDecl : public DeclaratorDecl, |
1784 | public DeclContext, |
1785 | public Redeclarable<FunctionDecl> { |
1786 | // This class stores some data in DeclContext::FunctionDeclBits |
1787 | // to save some space. Use the provided accessors to access it. |
1788 | public: |
1789 | /// The kind of templated function a FunctionDecl can be. |
1790 | enum TemplatedKind { |
1791 | // Not templated. |
1792 | TK_NonTemplate, |
1793 | // The pattern in a function template declaration. |
1794 | TK_FunctionTemplate, |
1795 | // A non-template function that is an instantiation or explicit |
1796 | // specialization of a member of a templated class. |
1797 | TK_MemberSpecialization, |
1798 | // An instantiation or explicit specialization of a function template. |
1799 | // Note: this might have been instantiated from a templated class if it |
1800 | // is a class-scope explicit specialization. |
1801 | TK_FunctionTemplateSpecialization, |
1802 | // A function template specialization that hasn't yet been resolved to a |
1803 | // particular specialized function template. |
1804 | TK_DependentFunctionTemplateSpecialization |
1805 | }; |
1806 | |
1807 | /// Stashed information about a defaulted function definition whose body has |
1808 | /// not yet been lazily generated. |
1809 | class DefaultedFunctionInfo final |
1810 | : llvm::TrailingObjects<DefaultedFunctionInfo, DeclAccessPair> { |
1811 | friend TrailingObjects; |
1812 | unsigned NumLookups; |
1813 | |
1814 | public: |
1815 | static DefaultedFunctionInfo *Create(ASTContext &Context, |
1816 | ArrayRef<DeclAccessPair> Lookups); |
1817 | /// Get the unqualified lookup results that should be used in this |
1818 | /// defaulted function definition. |
1819 | ArrayRef<DeclAccessPair> getUnqualifiedLookups() const { |
1820 | return {getTrailingObjects<DeclAccessPair>(), NumLookups}; |
1821 | } |
1822 | }; |
1823 | |
1824 | private: |
1825 | /// A new[]'d array of pointers to VarDecls for the formal |
1826 | /// parameters of this function. This is null if a prototype or if there are |
1827 | /// no formals. |
1828 | ParmVarDecl **ParamInfo = nullptr; |
1829 | |
1830 | /// The active member of this union is determined by |
1831 | /// FunctionDeclBits.HasDefaultedFunctionInfo. |
1832 | union { |
1833 | /// The body of the function. |
1834 | LazyDeclStmtPtr Body; |
1835 | /// Information about a future defaulted function definition. |
1836 | DefaultedFunctionInfo *DefaultedInfo; |
1837 | }; |
1838 | |
1839 | unsigned ODRHash; |
1840 | |
1841 | /// End part of this FunctionDecl's source range. |
1842 | /// |
1843 | /// We could compute the full range in getSourceRange(). However, when we're |
1844 | /// dealing with a function definition deserialized from a PCH/AST file, |
1845 | /// we can only compute the full range once the function body has been |
1846 | /// de-serialized, so it's far better to have the (sometimes-redundant) |
1847 | /// EndRangeLoc. |
1848 | SourceLocation EndRangeLoc; |
1849 | |
1850 | /// The template or declaration that this declaration |
1851 | /// describes or was instantiated from, respectively. |
1852 | /// |
1853 | /// For non-templates, this value will be NULL. For function |
1854 | /// declarations that describe a function template, this will be a |
1855 | /// pointer to a FunctionTemplateDecl. For member functions |
1856 | /// of class template specializations, this will be a MemberSpecializationInfo |
1857 | /// pointer containing information about the specialization. |
1858 | /// For function template specializations, this will be a |
1859 | /// FunctionTemplateSpecializationInfo, which contains information about |
1860 | /// the template being specialized and the template arguments involved in |
1861 | /// that specialization. |
1862 | llvm::PointerUnion<FunctionTemplateDecl *, |
1863 | MemberSpecializationInfo *, |
1864 | FunctionTemplateSpecializationInfo *, |
1865 | DependentFunctionTemplateSpecializationInfo *> |
1866 | TemplateOrSpecialization; |
1867 | |
1868 | /// Provides source/type location info for the declaration name embedded in |
1869 | /// the DeclaratorDecl base class. |
1870 | DeclarationNameLoc DNLoc; |
1871 | |
1872 | /// Specify that this function declaration is actually a function |
1873 | /// template specialization. |
1874 | /// |
1875 | /// \param C the ASTContext. |
1876 | /// |
1877 | /// \param Template the function template that this function template |
1878 | /// specialization specializes. |
1879 | /// |
1880 | /// \param TemplateArgs the template arguments that produced this |
1881 | /// function template specialization from the template. |
1882 | /// |
1883 | /// \param InsertPos If non-NULL, the position in the function template |
1884 | /// specialization set where the function template specialization data will |
1885 | /// be inserted. |
1886 | /// |
1887 | /// \param TSK the kind of template specialization this is. |
1888 | /// |
1889 | /// \param TemplateArgsAsWritten location info of template arguments. |
1890 | /// |
1891 | /// \param PointOfInstantiation point at which the function template |
1892 | /// specialization was first instantiated. |
1893 | void setFunctionTemplateSpecialization(ASTContext &C, |
1894 | FunctionTemplateDecl *Template, |
1895 | const TemplateArgumentList *TemplateArgs, |
1896 | void *InsertPos, |
1897 | TemplateSpecializationKind TSK, |
1898 | const TemplateArgumentListInfo *TemplateArgsAsWritten, |
1899 | SourceLocation PointOfInstantiation); |
1900 | |
1901 | /// Specify that this record is an instantiation of the |
1902 | /// member function FD. |
1903 | void setInstantiationOfMemberFunction(ASTContext &C, FunctionDecl *FD, |
1904 | TemplateSpecializationKind TSK); |
1905 | |
1906 | void setParams(ASTContext &C, ArrayRef<ParmVarDecl *> NewParamInfo); |
1907 | |
1908 | // This is unfortunately needed because ASTDeclWriter::VisitFunctionDecl |
1909 | // need to access this bit but we want to avoid making ASTDeclWriter |
1910 | // a friend of FunctionDeclBitfields just for this. |
1911 | bool isDeletedBit() const { return FunctionDeclBits.IsDeleted; } |
1912 | |
1913 | /// Whether an ODRHash has been stored. |
1914 | bool hasODRHash() const { return FunctionDeclBits.HasODRHash; } |
1915 | |
1916 | /// State that an ODRHash has been stored. |
1917 | void setHasODRHash(bool B = true) { FunctionDeclBits.HasODRHash = B; } |
1918 | |
1919 | protected: |
1920 | FunctionDecl(Kind DK, ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
1921 | const DeclarationNameInfo &NameInfo, QualType T, |
1922 | TypeSourceInfo *TInfo, StorageClass S, bool isInlineSpecified, |
1923 | ConstexprSpecKind ConstexprKind, |
1924 | Expr *TrailingRequiresClause = nullptr); |
1925 | |
1926 | using redeclarable_base = Redeclarable<FunctionDecl>; |
1927 | |
1928 | FunctionDecl *getNextRedeclarationImpl() override { |
1929 | return getNextRedeclaration(); |
1930 | } |
1931 | |
1932 | FunctionDecl *getPreviousDeclImpl() override { |
1933 | return getPreviousDecl(); |
1934 | } |
1935 | |
1936 | FunctionDecl *getMostRecentDeclImpl() override { |
1937 | return getMostRecentDecl(); |
1938 | } |
1939 | |
1940 | public: |
1941 | friend class ASTDeclReader; |
1942 | friend class ASTDeclWriter; |
1943 | |
1944 | using redecl_range = redeclarable_base::redecl_range; |
1945 | using redecl_iterator = redeclarable_base::redecl_iterator; |
1946 | |
1947 | using redeclarable_base::redecls_begin; |
1948 | using redeclarable_base::redecls_end; |
1949 | using redeclarable_base::redecls; |
1950 | using redeclarable_base::getPreviousDecl; |
1951 | using redeclarable_base::getMostRecentDecl; |
1952 | using redeclarable_base::isFirstDecl; |
1953 | |
1954 | static FunctionDecl * |
1955 | Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
1956 | SourceLocation NLoc, DeclarationName N, QualType T, |
1957 | TypeSourceInfo *TInfo, StorageClass SC, bool isInlineSpecified = false, |
1958 | bool hasWrittenPrototype = true, |
1959 | ConstexprSpecKind ConstexprKind = CSK_unspecified, |
1960 | Expr *TrailingRequiresClause = nullptr) { |
1961 | DeclarationNameInfo NameInfo(N, NLoc); |
1962 | return FunctionDecl::Create(C, DC, StartLoc, NameInfo, T, TInfo, SC, |
1963 | isInlineSpecified, hasWrittenPrototype, |
1964 | ConstexprKind, TrailingRequiresClause); |
1965 | } |
1966 | |
1967 | static FunctionDecl *Create(ASTContext &C, DeclContext *DC, |
1968 | SourceLocation StartLoc, |
1969 | const DeclarationNameInfo &NameInfo, QualType T, |
1970 | TypeSourceInfo *TInfo, StorageClass SC, |
1971 | bool isInlineSpecified, bool hasWrittenPrototype, |
1972 | ConstexprSpecKind ConstexprKind, |
1973 | Expr *TrailingRequiresClause); |
1974 | |
1975 | static FunctionDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
1976 | |
1977 | DeclarationNameInfo getNameInfo() const { |
1978 | return DeclarationNameInfo(getDeclName(), getLocation(), DNLoc); |
1979 | } |
1980 | |
1981 | void getNameForDiagnostic(raw_ostream &OS, const PrintingPolicy &Policy, |
1982 | bool Qualified) const override; |
1983 | |
1984 | void setRangeEnd(SourceLocation E) { EndRangeLoc = E; } |
1985 | |
1986 | /// Returns the location of the ellipsis of a variadic function. |
1987 | SourceLocation getEllipsisLoc() const { |
1988 | const auto *FPT = getType()->getAs<FunctionProtoType>(); |
1989 | if (FPT && FPT->isVariadic()) |
1990 | return FPT->getEllipsisLoc(); |
1991 | return SourceLocation(); |
1992 | } |
1993 | |
1994 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
1995 | |
1996 | // Function definitions. |
1997 | // |
1998 | // A function declaration may be: |
1999 | // - a non defining declaration, |
2000 | // - a definition. A function may be defined because: |
2001 | // - it has a body, or will have it in the case of late parsing. |
2002 | // - it has an uninstantiated body. The body does not exist because the |
2003 | // function is not used yet, but the declaration is considered a |
2004 | // definition and does not allow other definition of this function. |
2005 | // - it does not have a user specified body, but it does not allow |
2006 | // redefinition, because it is deleted/defaulted or is defined through |
2007 | // some other mechanism (alias, ifunc). |
2008 | |
2009 | /// Returns true if the function has a body. |
2010 | /// |
2011 | /// The function body might be in any of the (re-)declarations of this |
2012 | /// function. The variant that accepts a FunctionDecl pointer will set that |
2013 | /// function declaration to the actual declaration containing the body (if |
2014 | /// there is one). |
2015 | bool hasBody(const FunctionDecl *&Definition) const; |
2016 | |
2017 | bool hasBody() const override { |
2018 | const FunctionDecl* Definition; |
2019 | return hasBody(Definition); |
2020 | } |
2021 | |
2022 | /// Returns whether the function has a trivial body that does not require any |
2023 | /// specific codegen. |
2024 | bool hasTrivialBody() const; |
2025 | |
2026 | /// Returns true if the function has a definition that does not need to be |
2027 | /// instantiated. |
2028 | /// |
2029 | /// The variant that accepts a FunctionDecl pointer will set that function |
2030 | /// declaration to the declaration that is a definition (if there is one). |
2031 | bool isDefined(const FunctionDecl *&Definition) const; |
2032 | |
2033 | virtual bool isDefined() const { |
2034 | const FunctionDecl* Definition; |
2035 | return isDefined(Definition); |
2036 | } |
2037 | |
2038 | /// Get the definition for this declaration. |
2039 | FunctionDecl *getDefinition() { |
2040 | const FunctionDecl *Definition; |
2041 | if (isDefined(Definition)) |
2042 | return const_cast<FunctionDecl *>(Definition); |
2043 | return nullptr; |
2044 | } |
2045 | const FunctionDecl *getDefinition() const { |
2046 | return const_cast<FunctionDecl *>(this)->getDefinition(); |
2047 | } |
2048 | |
2049 | /// Retrieve the body (definition) of the function. The function body might be |
2050 | /// in any of the (re-)declarations of this function. The variant that accepts |
2051 | /// a FunctionDecl pointer will set that function declaration to the actual |
2052 | /// declaration containing the body (if there is one). |
2053 | /// NOTE: For checking if there is a body, use hasBody() instead, to avoid |
2054 | /// unnecessary AST de-serialization of the body. |
2055 | Stmt *getBody(const FunctionDecl *&Definition) const; |
2056 | |
2057 | Stmt *getBody() const override { |
2058 | const FunctionDecl* Definition; |
2059 | return getBody(Definition); |
2060 | } |
2061 | |
2062 | /// Returns whether this specific declaration of the function is also a |
2063 | /// definition that does not contain uninstantiated body. |
2064 | /// |
2065 | /// This does not determine whether the function has been defined (e.g., in a |
2066 | /// previous definition); for that information, use isDefined. |
2067 | /// |
2068 | /// Note: the function declaration does not become a definition until the |
2069 | /// parser reaches the definition, if called before, this function will return |
2070 | /// `false`. |
2071 | bool isThisDeclarationADefinition() const { |
2072 | return isDeletedAsWritten() || isDefaulted() || |
2073 | doesThisDeclarationHaveABody() || hasSkippedBody() || |
2074 | willHaveBody() || hasDefiningAttr(); |
2075 | } |
2076 | |
2077 | /// Returns whether this specific declaration of the function has a body. |
2078 | bool doesThisDeclarationHaveABody() const { |
2079 | return (!FunctionDeclBits.HasDefaultedFunctionInfo && Body) || |
2080 | isLateTemplateParsed(); |
2081 | } |
2082 | |
2083 | void setBody(Stmt *B); |
2084 | void setLazyBody(uint64_t Offset) { |
2085 | FunctionDeclBits.HasDefaultedFunctionInfo = false; |
2086 | Body = LazyDeclStmtPtr(Offset); |
2087 | } |
2088 | |
2089 | void setDefaultedFunctionInfo(DefaultedFunctionInfo *Info); |
2090 | DefaultedFunctionInfo *getDefaultedFunctionInfo() const; |
2091 | |
2092 | /// Whether this function is variadic. |
2093 | bool isVariadic() const; |
2094 | |
2095 | /// Whether this function is marked as virtual explicitly. |
2096 | bool isVirtualAsWritten() const { |
2097 | return FunctionDeclBits.IsVirtualAsWritten; |
2098 | } |
2099 | |
2100 | /// State that this function is marked as virtual explicitly. |
2101 | void setVirtualAsWritten(bool V) { FunctionDeclBits.IsVirtualAsWritten = V; } |
2102 | |
2103 | /// Whether this virtual function is pure, i.e. makes the containing class |
2104 | /// abstract. |
2105 | bool isPure() const { return FunctionDeclBits.IsPure; } |
2106 | void setPure(bool P = true); |
2107 | |
2108 | /// Whether this templated function will be late parsed. |
2109 | bool isLateTemplateParsed() const { |
2110 | return FunctionDeclBits.IsLateTemplateParsed; |
2111 | } |
2112 | |
2113 | /// State that this templated function will be late parsed. |
2114 | void setLateTemplateParsed(bool ILT = true) { |
2115 | FunctionDeclBits.IsLateTemplateParsed = ILT; |
2116 | } |
2117 | |
2118 | /// Whether this function is "trivial" in some specialized C++ senses. |
2119 | /// Can only be true for default constructors, copy constructors, |
2120 | /// copy assignment operators, and destructors. Not meaningful until |
2121 | /// the class has been fully built by Sema. |
2122 | bool isTrivial() const { return FunctionDeclBits.IsTrivial; } |
2123 | void setTrivial(bool IT) { FunctionDeclBits.IsTrivial = IT; } |
2124 | |
2125 | bool isTrivialForCall() const { return FunctionDeclBits.IsTrivialForCall; } |
2126 | void setTrivialForCall(bool IT) { FunctionDeclBits.IsTrivialForCall = IT; } |
2127 | |
2128 | /// Whether this function is defaulted per C++0x. Only valid for |
2129 | /// special member functions. |
2130 | bool isDefaulted() const { return FunctionDeclBits.IsDefaulted; } |
2131 | void setDefaulted(bool D = true) { FunctionDeclBits.IsDefaulted = D; } |
2132 | |
2133 | /// Whether this function is explicitly defaulted per C++0x. Only valid |
2134 | /// for special member functions. |
2135 | bool isExplicitlyDefaulted() const { |
2136 | return FunctionDeclBits.IsExplicitlyDefaulted; |
2137 | } |
2138 | |
2139 | /// State that this function is explicitly defaulted per C++0x. Only valid |
2140 | /// for special member functions. |
2141 | void setExplicitlyDefaulted(bool ED = true) { |
2142 | FunctionDeclBits.IsExplicitlyDefaulted = ED; |
2143 | } |
2144 | |
2145 | /// True if this method is user-declared and was not |
2146 | /// deleted or defaulted on its first declaration. |
2147 | bool isUserProvided() const { |
2148 | auto *DeclAsWritten = this; |
2149 | if (FunctionDecl *Pattern = getTemplateInstantiationPattern()) |
2150 | DeclAsWritten = Pattern; |
2151 | return !(DeclAsWritten->isDeleted() || |
2152 | DeclAsWritten->getCanonicalDecl()->isDefaulted()); |
2153 | } |
2154 | |
2155 | /// Whether falling off this function implicitly returns null/zero. |
2156 | /// If a more specific implicit return value is required, front-ends |
2157 | /// should synthesize the appropriate return statements. |
2158 | bool hasImplicitReturnZero() const { |
2159 | return FunctionDeclBits.HasImplicitReturnZero; |
2160 | } |
2161 | |
2162 | /// State that falling off this function implicitly returns null/zero. |
2163 | /// If a more specific implicit return value is required, front-ends |
2164 | /// should synthesize the appropriate return statements. |
2165 | void setHasImplicitReturnZero(bool IRZ) { |
2166 | FunctionDeclBits.HasImplicitReturnZero = IRZ; |
2167 | } |
2168 | |
2169 | /// Whether this function has a prototype, either because one |
2170 | /// was explicitly written or because it was "inherited" by merging |
2171 | /// a declaration without a prototype with a declaration that has a |
2172 | /// prototype. |
2173 | bool hasPrototype() const { |
2174 | return hasWrittenPrototype() || hasInheritedPrototype(); |
2175 | } |
2176 | |
2177 | /// Whether this function has a written prototype. |
2178 | bool hasWrittenPrototype() const { |
2179 | return FunctionDeclBits.HasWrittenPrototype; |
2180 | } |
2181 | |
2182 | /// State that this function has a written prototype. |
2183 | void setHasWrittenPrototype(bool P = true) { |
2184 | FunctionDeclBits.HasWrittenPrototype = P; |
2185 | } |
2186 | |
2187 | /// Whether this function inherited its prototype from a |
2188 | /// previous declaration. |
2189 | bool hasInheritedPrototype() const { |
2190 | return FunctionDeclBits.HasInheritedPrototype; |
2191 | } |
2192 | |
2193 | /// State that this function inherited its prototype from a |
2194 | /// previous declaration. |
2195 | void setHasInheritedPrototype(bool P = true) { |
2196 | FunctionDeclBits.HasInheritedPrototype = P; |
2197 | } |
2198 | |
2199 | /// Whether this is a (C++11) constexpr function or constexpr constructor. |
2200 | bool isConstexpr() const { |
2201 | return FunctionDeclBits.ConstexprKind != CSK_unspecified; |
2202 | } |
2203 | void setConstexprKind(ConstexprSpecKind CSK) { |
2204 | FunctionDeclBits.ConstexprKind = CSK; |
2205 | } |
2206 | ConstexprSpecKind getConstexprKind() const { |
2207 | return static_cast<ConstexprSpecKind>(FunctionDeclBits.ConstexprKind); |
2208 | } |
2209 | bool isConstexprSpecified() const { |
2210 | return FunctionDeclBits.ConstexprKind == CSK_constexpr; |
2211 | } |
2212 | bool isConsteval() const { |
2213 | return FunctionDeclBits.ConstexprKind == CSK_consteval; |
2214 | } |
2215 | |
2216 | /// Whether the instantiation of this function is pending. |
2217 | /// This bit is set when the decision to instantiate this function is made |
2218 | /// and unset if and when the function body is created. That leaves out |
2219 | /// cases where instantiation did not happen because the template definition |
2220 | /// was not seen in this TU. This bit remains set in those cases, under the |
2221 | /// assumption that the instantiation will happen in some other TU. |
2222 | bool instantiationIsPending() const { |
2223 | return FunctionDeclBits.InstantiationIsPending; |
2224 | } |
2225 | |
2226 | /// State that the instantiation of this function is pending. |
2227 | /// (see instantiationIsPending) |
2228 | void setInstantiationIsPending(bool IC) { |
2229 | FunctionDeclBits.InstantiationIsPending = IC; |
2230 | } |
2231 | |
2232 | /// Indicates the function uses __try. |
2233 | bool usesSEHTry() const { return FunctionDeclBits.UsesSEHTry; } |
2234 | void setUsesSEHTry(bool UST) { FunctionDeclBits.UsesSEHTry = UST; } |
2235 | |
2236 | /// Indicates the function uses Floating Point constrained intrinsics |
2237 | bool usesFPIntrin() const { return FunctionDeclBits.UsesFPIntrin; } |
2238 | void setUsesFPIntrin(bool Val) { FunctionDeclBits.UsesFPIntrin = Val; } |
2239 | |
2240 | /// Whether this function has been deleted. |
2241 | /// |
2242 | /// A function that is "deleted" (via the C++0x "= delete" syntax) |
2243 | /// acts like a normal function, except that it cannot actually be |
2244 | /// called or have its address taken. Deleted functions are |
2245 | /// typically used in C++ overload resolution to attract arguments |
2246 | /// whose type or lvalue/rvalue-ness would permit the use of a |
2247 | /// different overload that would behave incorrectly. For example, |
2248 | /// one might use deleted functions to ban implicit conversion from |
2249 | /// a floating-point number to an Integer type: |
2250 | /// |
2251 | /// @code |
2252 | /// struct Integer { |
2253 | /// Integer(long); // construct from a long |
2254 | /// Integer(double) = delete; // no construction from float or double |
2255 | /// Integer(long double) = delete; // no construction from long double |
2256 | /// }; |
2257 | /// @endcode |
2258 | // If a function is deleted, its first declaration must be. |
2259 | bool isDeleted() const { |
2260 | return getCanonicalDecl()->FunctionDeclBits.IsDeleted; |
2261 | } |
2262 | |
2263 | bool isDeletedAsWritten() const { |
2264 | return FunctionDeclBits.IsDeleted && !isDefaulted(); |
2265 | } |
2266 | |
2267 | void setDeletedAsWritten(bool D = true) { FunctionDeclBits.IsDeleted = D; } |
2268 | |
2269 | /// Determines whether this function is "main", which is the |
2270 | /// entry point into an executable program. |
2271 | bool isMain() const; |
2272 | |
2273 | /// Determines whether this function is a MSVCRT user defined entry |
2274 | /// point. |
2275 | bool isMSVCRTEntryPoint() const; |
2276 | |
2277 | /// Determines whether this operator new or delete is one |
2278 | /// of the reserved global placement operators: |
2279 | /// void *operator new(size_t, void *); |
2280 | /// void *operator new[](size_t, void *); |
2281 | /// void operator delete(void *, void *); |
2282 | /// void operator delete[](void *, void *); |
2283 | /// These functions have special behavior under [new.delete.placement]: |
2284 | /// These functions are reserved, a C++ program may not define |
2285 | /// functions that displace the versions in the Standard C++ library. |
2286 | /// The provisions of [basic.stc.dynamic] do not apply to these |
2287 | /// reserved placement forms of operator new and operator delete. |
2288 | /// |
2289 | /// This function must be an allocation or deallocation function. |
2290 | bool isReservedGlobalPlacementOperator() const; |
2291 | |
2292 | /// Determines whether this function is one of the replaceable |
2293 | /// global allocation functions: |
2294 | /// void *operator new(size_t); |
2295 | /// void *operator new(size_t, const std::nothrow_t &) noexcept; |
2296 | /// void *operator new[](size_t); |
2297 | /// void *operator new[](size_t, const std::nothrow_t &) noexcept; |
2298 | /// void operator delete(void *) noexcept; |
2299 | /// void operator delete(void *, std::size_t) noexcept; [C++1y] |
2300 | /// void operator delete(void *, const std::nothrow_t &) noexcept; |
2301 | /// void operator delete[](void *) noexcept; |
2302 | /// void operator delete[](void *, std::size_t) noexcept; [C++1y] |
2303 | /// void operator delete[](void *, const std::nothrow_t &) noexcept; |
2304 | /// These functions have special behavior under C++1y [expr.new]: |
2305 | /// An implementation is allowed to omit a call to a replaceable global |
2306 | /// allocation function. [...] |
2307 | /// |
2308 | /// If this function is an aligned allocation/deallocation function, return |
2309 | /// the parameter number of the requested alignment through AlignmentParam. |
2310 | /// |
2311 | /// If this function is an allocation/deallocation function that takes |
2312 | /// the `std::nothrow_t` tag, return true through IsNothrow, |
2313 | bool isReplaceableGlobalAllocationFunction( |
2314 | Optional<unsigned> *AlignmentParam = nullptr, |
2315 | bool *IsNothrow = nullptr) const; |
2316 | |
2317 | /// Determine if this function provides an inline implementation of a builtin. |
2318 | bool isInlineBuiltinDeclaration() const; |
2319 | |
2320 | /// Determine whether this is a destroying operator delete. |
2321 | bool isDestroyingOperatorDelete() const; |
2322 | |
2323 | /// Compute the language linkage. |
2324 | LanguageLinkage getLanguageLinkage() const; |
2325 | |
2326 | /// Determines whether this function is a function with |
2327 | /// external, C linkage. |
2328 | bool isExternC() const; |
2329 | |
2330 | /// Determines whether this function's context is, or is nested within, |
2331 | /// a C++ extern "C" linkage spec. |
2332 | bool isInExternCContext() const; |
2333 | |
2334 | /// Determines whether this function's context is, or is nested within, |
2335 | /// a C++ extern "C++" linkage spec. |
2336 | bool isInExternCXXContext() const; |
2337 | |
2338 | /// Determines whether this is a global function. |
2339 | bool isGlobal() const; |
2340 | |
2341 | /// Determines whether this function is known to be 'noreturn', through |
2342 | /// an attribute on its declaration or its type. |
2343 | bool isNoReturn() const; |
2344 | |
2345 | /// True if the function was a definition but its body was skipped. |
2346 | bool hasSkippedBody() const { return FunctionDeclBits.HasSkippedBody; } |
2347 | void setHasSkippedBody(bool Skipped = true) { |
2348 | FunctionDeclBits.HasSkippedBody = Skipped; |
2349 | } |
2350 | |
2351 | /// True if this function will eventually have a body, once it's fully parsed. |
2352 | bool willHaveBody() const { return FunctionDeclBits.WillHaveBody; } |
2353 | void setWillHaveBody(bool V = true) { FunctionDeclBits.WillHaveBody = V; } |
2354 | |
2355 | /// True if this function is considered a multiversioned function. |
2356 | bool isMultiVersion() const { |
2357 | return getCanonicalDecl()->FunctionDeclBits.IsMultiVersion; |
2358 | } |
2359 | |
2360 | /// Sets the multiversion state for this declaration and all of its |
2361 | /// redeclarations. |
2362 | void setIsMultiVersion(bool V = true) { |
2363 | getCanonicalDecl()->FunctionDeclBits.IsMultiVersion = V; |
2364 | } |
2365 | |
2366 | /// Gets the kind of multiversioning attribute this declaration has. Note that |
2367 | /// this can return a value even if the function is not multiversion, such as |
2368 | /// the case of 'target'. |
2369 | MultiVersionKind getMultiVersionKind() const; |
2370 | |
2371 | |
2372 | /// True if this function is a multiversioned dispatch function as a part of |
2373 | /// the cpu_specific/cpu_dispatch functionality. |
2374 | bool isCPUDispatchMultiVersion() const; |
2375 | /// True if this function is a multiversioned processor specific function as a |
2376 | /// part of the cpu_specific/cpu_dispatch functionality. |
2377 | bool isCPUSpecificMultiVersion() const; |
2378 | |
2379 | /// True if this function is a multiversioned dispatch function as a part of |
2380 | /// the target functionality. |
2381 | bool isTargetMultiVersion() const; |
2382 | |
2383 | /// \brief Get the associated-constraints of this function declaration. |
2384 | /// Currently, this will either be a vector of size 1 containing the |
2385 | /// trailing-requires-clause or an empty vector. |
2386 | /// |
2387 | /// Use this instead of getTrailingRequiresClause for concepts APIs that |
2388 | /// accept an ArrayRef of constraint expressions. |
2389 | void getAssociatedConstraints(SmallVectorImpl<const Expr *> &AC) const { |
2390 | if (auto *TRC = getTrailingRequiresClause()) |
2391 | AC.push_back(TRC); |
2392 | } |
2393 | |
2394 | void setPreviousDeclaration(FunctionDecl * PrevDecl); |
2395 | |
2396 | FunctionDecl *getCanonicalDecl() override; |
2397 | const FunctionDecl *getCanonicalDecl() const { |
2398 | return const_cast<FunctionDecl*>(this)->getCanonicalDecl(); |
2399 | } |
2400 | |
2401 | unsigned getBuiltinID(bool ConsiderWrapperFunctions = false) const; |
2402 | |
2403 | // ArrayRef interface to parameters. |
2404 | ArrayRef<ParmVarDecl *> parameters() const { |
2405 | return {ParamInfo, getNumParams()}; |
2406 | } |
2407 | MutableArrayRef<ParmVarDecl *> parameters() { |
2408 | return {ParamInfo, getNumParams()}; |
2409 | } |
2410 | |
2411 | // Iterator access to formal parameters. |
2412 | using param_iterator = MutableArrayRef<ParmVarDecl *>::iterator; |
2413 | using param_const_iterator = ArrayRef<ParmVarDecl *>::const_iterator; |
2414 | |
2415 | bool param_empty() const { return parameters().empty(); } |
2416 | param_iterator param_begin() { return parameters().begin(); } |
2417 | param_iterator param_end() { return parameters().end(); } |
2418 | param_const_iterator param_begin() const { return parameters().begin(); } |
2419 | param_const_iterator param_end() const { return parameters().end(); } |
2420 | size_t param_size() const { return parameters().size(); } |
2421 | |
2422 | /// Return the number of parameters this function must have based on its |
2423 | /// FunctionType. This is the length of the ParamInfo array after it has been |
2424 | /// created. |
2425 | unsigned getNumParams() const; |
2426 | |
2427 | const ParmVarDecl *getParamDecl(unsigned i) const { |
2428 | assert(i < getNumParams() && "Illegal param #")((i < getNumParams() && "Illegal param #") ? static_cast <void> (0) : __assert_fail ("i < getNumParams() && \"Illegal param #\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 2428, __PRETTY_FUNCTION__)); |
2429 | return ParamInfo[i]; |
2430 | } |
2431 | ParmVarDecl *getParamDecl(unsigned i) { |
2432 | assert(i < getNumParams() && "Illegal param #")((i < getNumParams() && "Illegal param #") ? static_cast <void> (0) : __assert_fail ("i < getNumParams() && \"Illegal param #\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 2432, __PRETTY_FUNCTION__)); |
2433 | return ParamInfo[i]; |
2434 | } |
2435 | void setParams(ArrayRef<ParmVarDecl *> NewParamInfo) { |
2436 | setParams(getASTContext(), NewParamInfo); |
2437 | } |
2438 | |
2439 | /// Returns the minimum number of arguments needed to call this function. This |
2440 | /// may be fewer than the number of function parameters, if some of the |
2441 | /// parameters have default arguments (in C++). |
2442 | unsigned getMinRequiredArguments() const; |
2443 | |
2444 | /// Find the source location information for how the type of this function |
2445 | /// was written. May be absent (for example if the function was declared via |
2446 | /// a typedef) and may contain a different type from that of the function |
2447 | /// (for example if the function type was adjusted by an attribute). |
2448 | FunctionTypeLoc getFunctionTypeLoc() const; |
2449 | |
2450 | QualType getReturnType() const { |
2451 | return getType()->castAs<FunctionType>()->getReturnType(); |
2452 | } |
2453 | |
2454 | /// Attempt to compute an informative source range covering the |
2455 | /// function return type. This may omit qualifiers and other information with |
2456 | /// limited representation in the AST. |
2457 | SourceRange getReturnTypeSourceRange() const; |
2458 | |
2459 | /// Attempt to compute an informative source range covering the |
2460 | /// function parameters, including the ellipsis of a variadic function. |
2461 | /// The source range excludes the parentheses, and is invalid if there are |
2462 | /// no parameters and no ellipsis. |
2463 | SourceRange getParametersSourceRange() const; |
2464 | |
2465 | /// Get the declared return type, which may differ from the actual return |
2466 | /// type if the return type is deduced. |
2467 | QualType getDeclaredReturnType() const { |
2468 | auto *TSI = getTypeSourceInfo(); |
2469 | QualType T = TSI ? TSI->getType() : getType(); |
2470 | return T->castAs<FunctionType>()->getReturnType(); |
2471 | } |
2472 | |
2473 | /// Gets the ExceptionSpecificationType as declared. |
2474 | ExceptionSpecificationType getExceptionSpecType() const { |
2475 | auto *TSI = getTypeSourceInfo(); |
2476 | QualType T = TSI ? TSI->getType() : getType(); |
2477 | const auto *FPT = T->getAs<FunctionProtoType>(); |
2478 | return FPT ? FPT->getExceptionSpecType() : EST_None; |
2479 | } |
2480 | |
2481 | /// Attempt to compute an informative source range covering the |
2482 | /// function exception specification, if any. |
2483 | SourceRange getExceptionSpecSourceRange() const; |
2484 | |
2485 | /// Determine the type of an expression that calls this function. |
2486 | QualType getCallResultType() const { |
2487 | return getType()->castAs<FunctionType>()->getCallResultType( |
2488 | getASTContext()); |
2489 | } |
2490 | |
2491 | /// Returns the storage class as written in the source. For the |
2492 | /// computed linkage of symbol, see getLinkage. |
2493 | StorageClass getStorageClass() const { |
2494 | return static_cast<StorageClass>(FunctionDeclBits.SClass); |
2495 | } |
2496 | |
2497 | /// Sets the storage class as written in the source. |
2498 | void setStorageClass(StorageClass SClass) { |
2499 | FunctionDeclBits.SClass = SClass; |
2500 | } |
2501 | |
2502 | /// Determine whether the "inline" keyword was specified for this |
2503 | /// function. |
2504 | bool isInlineSpecified() const { return FunctionDeclBits.IsInlineSpecified; } |
2505 | |
2506 | /// Set whether the "inline" keyword was specified for this function. |
2507 | void setInlineSpecified(bool I) { |
2508 | FunctionDeclBits.IsInlineSpecified = I; |
2509 | FunctionDeclBits.IsInline = I; |
2510 | } |
2511 | |
2512 | /// Flag that this function is implicitly inline. |
2513 | void setImplicitlyInline(bool I = true) { FunctionDeclBits.IsInline = I; } |
2514 | |
2515 | /// Determine whether this function should be inlined, because it is |
2516 | /// either marked "inline" or "constexpr" or is a member function of a class |
2517 | /// that was defined in the class body. |
2518 | bool isInlined() const { return FunctionDeclBits.IsInline; } |
2519 | |
2520 | bool isInlineDefinitionExternallyVisible() const; |
2521 | |
2522 | bool isMSExternInline() const; |
2523 | |
2524 | bool doesDeclarationForceExternallyVisibleDefinition() const; |
2525 | |
2526 | bool isStatic() const { return getStorageClass() == SC_Static; } |
2527 | |
2528 | /// Whether this function declaration represents an C++ overloaded |
2529 | /// operator, e.g., "operator+". |
2530 | bool isOverloadedOperator() const { |
2531 | return getOverloadedOperator() != OO_None; |
2532 | } |
2533 | |
2534 | OverloadedOperatorKind getOverloadedOperator() const; |
2535 | |
2536 | const IdentifierInfo *getLiteralIdentifier() const; |
2537 | |
2538 | /// If this function is an instantiation of a member function |
2539 | /// of a class template specialization, retrieves the function from |
2540 | /// which it was instantiated. |
2541 | /// |
2542 | /// This routine will return non-NULL for (non-templated) member |
2543 | /// functions of class templates and for instantiations of function |
2544 | /// templates. For example, given: |
2545 | /// |
2546 | /// \code |
2547 | /// template<typename T> |
2548 | /// struct X { |
2549 | /// void f(T); |
2550 | /// }; |
2551 | /// \endcode |
2552 | /// |
2553 | /// The declaration for X<int>::f is a (non-templated) FunctionDecl |
2554 | /// whose parent is the class template specialization X<int>. For |
2555 | /// this declaration, getInstantiatedFromFunction() will return |
2556 | /// the FunctionDecl X<T>::A. When a complete definition of |
2557 | /// X<int>::A is required, it will be instantiated from the |
2558 | /// declaration returned by getInstantiatedFromMemberFunction(). |
2559 | FunctionDecl *getInstantiatedFromMemberFunction() const; |
2560 | |
2561 | /// What kind of templated function this is. |
2562 | TemplatedKind getTemplatedKind() const; |
2563 | |
2564 | /// If this function is an instantiation of a member function of a |
2565 | /// class template specialization, retrieves the member specialization |
2566 | /// information. |
2567 | MemberSpecializationInfo *getMemberSpecializationInfo() const; |
2568 | |
2569 | /// Specify that this record is an instantiation of the |
2570 | /// member function FD. |
2571 | void setInstantiationOfMemberFunction(FunctionDecl *FD, |
2572 | TemplateSpecializationKind TSK) { |
2573 | setInstantiationOfMemberFunction(getASTContext(), FD, TSK); |
2574 | } |
2575 | |
2576 | /// Retrieves the function template that is described by this |
2577 | /// function declaration. |
2578 | /// |
2579 | /// Every function template is represented as a FunctionTemplateDecl |
2580 | /// and a FunctionDecl (or something derived from FunctionDecl). The |
2581 | /// former contains template properties (such as the template |
2582 | /// parameter lists) while the latter contains the actual |
2583 | /// description of the template's |
2584 | /// contents. FunctionTemplateDecl::getTemplatedDecl() retrieves the |
2585 | /// FunctionDecl that describes the function template, |
2586 | /// getDescribedFunctionTemplate() retrieves the |
2587 | /// FunctionTemplateDecl from a FunctionDecl. |
2588 | FunctionTemplateDecl *getDescribedFunctionTemplate() const; |
2589 | |
2590 | void setDescribedFunctionTemplate(FunctionTemplateDecl *Template); |
2591 | |
2592 | /// Determine whether this function is a function template |
2593 | /// specialization. |
2594 | bool isFunctionTemplateSpecialization() const { |
2595 | return getPrimaryTemplate() != nullptr; |
2596 | } |
2597 | |
2598 | /// If this function is actually a function template specialization, |
2599 | /// retrieve information about this function template specialization. |
2600 | /// Otherwise, returns NULL. |
2601 | FunctionTemplateSpecializationInfo *getTemplateSpecializationInfo() const; |
2602 | |
2603 | /// Determines whether this function is a function template |
2604 | /// specialization or a member of a class template specialization that can |
2605 | /// be implicitly instantiated. |
2606 | bool isImplicitlyInstantiable() const; |
2607 | |
2608 | /// Determines if the given function was instantiated from a |
2609 | /// function template. |
2610 | bool isTemplateInstantiation() const; |
2611 | |
2612 | /// Retrieve the function declaration from which this function could |
2613 | /// be instantiated, if it is an instantiation (rather than a non-template |
2614 | /// or a specialization, for example). |
2615 | FunctionDecl *getTemplateInstantiationPattern() const; |
2616 | |
2617 | /// Retrieve the primary template that this function template |
2618 | /// specialization either specializes or was instantiated from. |
2619 | /// |
2620 | /// If this function declaration is not a function template specialization, |
2621 | /// returns NULL. |
2622 | FunctionTemplateDecl *getPrimaryTemplate() const; |
2623 | |
2624 | /// Retrieve the template arguments used to produce this function |
2625 | /// template specialization from the primary template. |
2626 | /// |
2627 | /// If this function declaration is not a function template specialization, |
2628 | /// returns NULL. |
2629 | const TemplateArgumentList *getTemplateSpecializationArgs() const; |
2630 | |
2631 | /// Retrieve the template argument list as written in the sources, |
2632 | /// if any. |
2633 | /// |
2634 | /// If this function declaration is not a function template specialization |
2635 | /// or if it had no explicit template argument list, returns NULL. |
2636 | /// Note that it an explicit template argument list may be written empty, |
2637 | /// e.g., template<> void foo<>(char* s); |
2638 | const ASTTemplateArgumentListInfo* |
2639 | getTemplateSpecializationArgsAsWritten() const; |
2640 | |
2641 | /// Specify that this function declaration is actually a function |
2642 | /// template specialization. |
2643 | /// |
2644 | /// \param Template the function template that this function template |
2645 | /// specialization specializes. |
2646 | /// |
2647 | /// \param TemplateArgs the template arguments that produced this |
2648 | /// function template specialization from the template. |
2649 | /// |
2650 | /// \param InsertPos If non-NULL, the position in the function template |
2651 | /// specialization set where the function template specialization data will |
2652 | /// be inserted. |
2653 | /// |
2654 | /// \param TSK the kind of template specialization this is. |
2655 | /// |
2656 | /// \param TemplateArgsAsWritten location info of template arguments. |
2657 | /// |
2658 | /// \param PointOfInstantiation point at which the function template |
2659 | /// specialization was first instantiated. |
2660 | void setFunctionTemplateSpecialization(FunctionTemplateDecl *Template, |
2661 | const TemplateArgumentList *TemplateArgs, |
2662 | void *InsertPos, |
2663 | TemplateSpecializationKind TSK = TSK_ImplicitInstantiation, |
2664 | const TemplateArgumentListInfo *TemplateArgsAsWritten = nullptr, |
2665 | SourceLocation PointOfInstantiation = SourceLocation()) { |
2666 | setFunctionTemplateSpecialization(getASTContext(), Template, TemplateArgs, |
2667 | InsertPos, TSK, TemplateArgsAsWritten, |
2668 | PointOfInstantiation); |
2669 | } |
2670 | |
2671 | /// Specifies that this function declaration is actually a |
2672 | /// dependent function template specialization. |
2673 | void setDependentTemplateSpecialization(ASTContext &Context, |
2674 | const UnresolvedSetImpl &Templates, |
2675 | const TemplateArgumentListInfo &TemplateArgs); |
2676 | |
2677 | DependentFunctionTemplateSpecializationInfo * |
2678 | getDependentSpecializationInfo() const; |
2679 | |
2680 | /// Determine what kind of template instantiation this function |
2681 | /// represents. |
2682 | TemplateSpecializationKind getTemplateSpecializationKind() const; |
2683 | |
2684 | /// Determine the kind of template specialization this function represents |
2685 | /// for the purpose of template instantiation. |
2686 | TemplateSpecializationKind |
2687 | getTemplateSpecializationKindForInstantiation() const; |
2688 | |
2689 | /// Determine what kind of template instantiation this function |
2690 | /// represents. |
2691 | void setTemplateSpecializationKind(TemplateSpecializationKind TSK, |
2692 | SourceLocation PointOfInstantiation = SourceLocation()); |
2693 | |
2694 | /// Retrieve the (first) point of instantiation of a function template |
2695 | /// specialization or a member of a class template specialization. |
2696 | /// |
2697 | /// \returns the first point of instantiation, if this function was |
2698 | /// instantiated from a template; otherwise, returns an invalid source |
2699 | /// location. |
2700 | SourceLocation getPointOfInstantiation() const; |
2701 | |
2702 | /// Determine whether this is or was instantiated from an out-of-line |
2703 | /// definition of a member function. |
2704 | bool isOutOfLine() const override; |
2705 | |
2706 | /// Identify a memory copying or setting function. |
2707 | /// If the given function is a memory copy or setting function, returns |
2708 | /// the corresponding Builtin ID. If the function is not a memory function, |
2709 | /// returns 0. |
2710 | unsigned getMemoryFunctionKind() const; |
2711 | |
2712 | /// Returns ODRHash of the function. This value is calculated and |
2713 | /// stored on first call, then the stored value returned on the other calls. |
2714 | unsigned getODRHash(); |
2715 | |
2716 | /// Returns cached ODRHash of the function. This must have been previously |
2717 | /// computed and stored. |
2718 | unsigned getODRHash() const; |
2719 | |
2720 | // Implement isa/cast/dyncast/etc. |
2721 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
2722 | static bool classofKind(Kind K) { |
2723 | return K >= firstFunction && K <= lastFunction; |
2724 | } |
2725 | static DeclContext *castToDeclContext(const FunctionDecl *D) { |
2726 | return static_cast<DeclContext *>(const_cast<FunctionDecl*>(D)); |
2727 | } |
2728 | static FunctionDecl *castFromDeclContext(const DeclContext *DC) { |
2729 | return static_cast<FunctionDecl *>(const_cast<DeclContext*>(DC)); |
2730 | } |
2731 | }; |
2732 | |
2733 | /// Represents a member of a struct/union/class. |
2734 | class FieldDecl : public DeclaratorDecl, public Mergeable<FieldDecl> { |
2735 | unsigned BitField : 1; |
2736 | unsigned Mutable : 1; |
2737 | mutable unsigned CachedFieldIndex : 30; |
2738 | |
2739 | /// The kinds of value we can store in InitializerOrBitWidth. |
2740 | /// |
2741 | /// Note that this is compatible with InClassInitStyle except for |
2742 | /// ISK_CapturedVLAType. |
2743 | enum InitStorageKind { |
2744 | /// If the pointer is null, there's nothing special. Otherwise, |
2745 | /// this is a bitfield and the pointer is the Expr* storing the |
2746 | /// bit-width. |
2747 | ISK_NoInit = (unsigned) ICIS_NoInit, |
2748 | |
2749 | /// The pointer is an (optional due to delayed parsing) Expr* |
2750 | /// holding the copy-initializer. |
2751 | ISK_InClassCopyInit = (unsigned) ICIS_CopyInit, |
2752 | |
2753 | /// The pointer is an (optional due to delayed parsing) Expr* |
2754 | /// holding the list-initializer. |
2755 | ISK_InClassListInit = (unsigned) ICIS_ListInit, |
2756 | |
2757 | /// The pointer is a VariableArrayType* that's been captured; |
2758 | /// the enclosing context is a lambda or captured statement. |
2759 | ISK_CapturedVLAType, |
2760 | }; |
2761 | |
2762 | /// If this is a bitfield with a default member initializer, this |
2763 | /// structure is used to represent the two expressions. |
2764 | struct InitAndBitWidth { |
2765 | Expr *Init; |
2766 | Expr *BitWidth; |
2767 | }; |
2768 | |
2769 | /// Storage for either the bit-width, the in-class initializer, or |
2770 | /// both (via InitAndBitWidth), or the captured variable length array bound. |
2771 | /// |
2772 | /// If the storage kind is ISK_InClassCopyInit or |
2773 | /// ISK_InClassListInit, but the initializer is null, then this |
2774 | /// field has an in-class initializer that has not yet been parsed |
2775 | /// and attached. |
2776 | // FIXME: Tail-allocate this to reduce the size of FieldDecl in the |
2777 | // overwhelmingly common case that we have none of these things. |
2778 | llvm::PointerIntPair<void *, 2, InitStorageKind> InitStorage; |
2779 | |
2780 | protected: |
2781 | FieldDecl(Kind DK, DeclContext *DC, SourceLocation StartLoc, |
2782 | SourceLocation IdLoc, IdentifierInfo *Id, |
2783 | QualType T, TypeSourceInfo *TInfo, Expr *BW, bool Mutable, |
2784 | InClassInitStyle InitStyle) |
2785 | : DeclaratorDecl(DK, DC, IdLoc, Id, T, TInfo, StartLoc), |
2786 | BitField(false), Mutable(Mutable), CachedFieldIndex(0), |
2787 | InitStorage(nullptr, (InitStorageKind) InitStyle) { |
2788 | if (BW) |
2789 | setBitWidth(BW); |
2790 | } |
2791 | |
2792 | public: |
2793 | friend class ASTDeclReader; |
2794 | friend class ASTDeclWriter; |
2795 | |
2796 | static FieldDecl *Create(const ASTContext &C, DeclContext *DC, |
2797 | SourceLocation StartLoc, SourceLocation IdLoc, |
2798 | IdentifierInfo *Id, QualType T, |
2799 | TypeSourceInfo *TInfo, Expr *BW, bool Mutable, |
2800 | InClassInitStyle InitStyle); |
2801 | |
2802 | static FieldDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
2803 | |
2804 | /// Returns the index of this field within its record, |
2805 | /// as appropriate for passing to ASTRecordLayout::getFieldOffset. |
2806 | unsigned getFieldIndex() const; |
2807 | |
2808 | /// Determines whether this field is mutable (C++ only). |
2809 | bool isMutable() const { return Mutable; } |
2810 | |
2811 | /// Determines whether this field is a bitfield. |
2812 | bool isBitField() const { return BitField; } |
2813 | |
2814 | /// Determines whether this is an unnamed bitfield. |
2815 | bool isUnnamedBitfield() const { return isBitField() && !getDeclName(); } |
2816 | |
2817 | /// Determines whether this field is a |
2818 | /// representative for an anonymous struct or union. Such fields are |
2819 | /// unnamed and are implicitly generated by the implementation to |
2820 | /// store the data for the anonymous union or struct. |
2821 | bool isAnonymousStructOrUnion() const; |
2822 | |
2823 | Expr *getBitWidth() const { |
2824 | if (!BitField) |
2825 | return nullptr; |
2826 | void *Ptr = InitStorage.getPointer(); |
2827 | if (getInClassInitStyle()) |
2828 | return static_cast<InitAndBitWidth*>(Ptr)->BitWidth; |
2829 | return static_cast<Expr*>(Ptr); |
2830 | } |
2831 | |
2832 | unsigned getBitWidthValue(const ASTContext &Ctx) const; |
2833 | |
2834 | /// Set the bit-field width for this member. |
2835 | // Note: used by some clients (i.e., do not remove it). |
2836 | void setBitWidth(Expr *Width) { |
2837 | 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-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 2838, __PRETTY_FUNCTION__)) |
2838 | "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-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 2838, __PRETTY_FUNCTION__)); |
2839 | 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-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 2839, __PRETTY_FUNCTION__)); |
2840 | InitStorage.setPointer( |
2841 | InitStorage.getInt() |
2842 | ? new (getASTContext()) |
2843 | InitAndBitWidth{getInClassInitializer(), Width} |
2844 | : static_cast<void*>(Width)); |
2845 | BitField = true; |
2846 | } |
2847 | |
2848 | /// Remove the bit-field width from this member. |
2849 | // Note: used by some clients (i.e., do not remove it). |
2850 | void removeBitWidth() { |
2851 | 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-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 2851, __PRETTY_FUNCTION__)); |
2852 | InitStorage.setPointer(getInClassInitializer()); |
2853 | BitField = false; |
2854 | } |
2855 | |
2856 | /// Is this a zero-length bit-field? Such bit-fields aren't really bit-fields |
2857 | /// at all and instead act as a separator between contiguous runs of other |
2858 | /// bit-fields. |
2859 | bool isZeroLengthBitField(const ASTContext &Ctx) const; |
2860 | |
2861 | /// Determine if this field is a subobject of zero size, that is, either a |
2862 | /// zero-length bit-field or a field of empty class type with the |
2863 | /// [[no_unique_address]] attribute. |
2864 | bool isZeroSize(const ASTContext &Ctx) const; |
2865 | |
2866 | /// Get the kind of (C++11) default member initializer that this field has. |
2867 | InClassInitStyle getInClassInitStyle() const { |
2868 | InitStorageKind storageKind = InitStorage.getInt(); |
2869 | return (storageKind == ISK_CapturedVLAType |
2870 | ? ICIS_NoInit : (InClassInitStyle) storageKind); |
2871 | } |
2872 | |
2873 | /// Determine whether this member has a C++11 default member initializer. |
2874 | bool hasInClassInitializer() const { |
2875 | return getInClassInitStyle() != ICIS_NoInit; |
2876 | } |
2877 | |
2878 | /// Get the C++11 default member initializer for this member, or null if one |
2879 | /// has not been set. If a valid declaration has a default member initializer, |
2880 | /// but this returns null, then we have not parsed and attached it yet. |
2881 | Expr *getInClassInitializer() const { |
2882 | if (!hasInClassInitializer()) |
2883 | return nullptr; |
2884 | void *Ptr = InitStorage.getPointer(); |
2885 | if (BitField) |
2886 | return static_cast<InitAndBitWidth*>(Ptr)->Init; |
2887 | return static_cast<Expr*>(Ptr); |
2888 | } |
2889 | |
2890 | /// Set the C++11 in-class initializer for this member. |
2891 | void setInClassInitializer(Expr *Init) { |
2892 | assert(hasInClassInitializer() && !getInClassInitializer())((hasInClassInitializer() && !getInClassInitializer() ) ? static_cast<void> (0) : __assert_fail ("hasInClassInitializer() && !getInClassInitializer()" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 2892, __PRETTY_FUNCTION__)); |
2893 | if (BitField) |
2894 | static_cast<InitAndBitWidth*>(InitStorage.getPointer())->Init = Init; |
2895 | else |
2896 | InitStorage.setPointer(Init); |
2897 | } |
2898 | |
2899 | /// Remove the C++11 in-class initializer from this member. |
2900 | void removeInClassInitializer() { |
2901 | 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-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 2901, __PRETTY_FUNCTION__)); |
2902 | InitStorage.setPointerAndInt(getBitWidth(), ISK_NoInit); |
2903 | } |
2904 | |
2905 | /// Determine whether this member captures the variable length array |
2906 | /// type. |
2907 | bool hasCapturedVLAType() const { |
2908 | return InitStorage.getInt() == ISK_CapturedVLAType; |
2909 | } |
2910 | |
2911 | /// Get the captured variable length array type. |
2912 | const VariableArrayType *getCapturedVLAType() const { |
2913 | return hasCapturedVLAType() ? static_cast<const VariableArrayType *>( |
2914 | InitStorage.getPointer()) |
2915 | : nullptr; |
2916 | } |
2917 | |
2918 | /// Set the captured variable length array type for this field. |
2919 | void setCapturedVLAType(const VariableArrayType *VLAType); |
2920 | |
2921 | /// Returns the parent of this field declaration, which |
2922 | /// is the struct in which this field is defined. |
2923 | const RecordDecl *getParent() const { |
2924 | return cast<RecordDecl>(getDeclContext()); |
2925 | } |
2926 | |
2927 | RecordDecl *getParent() { |
2928 | return cast<RecordDecl>(getDeclContext()); |
2929 | } |
2930 | |
2931 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
2932 | |
2933 | /// Retrieves the canonical declaration of this field. |
2934 | FieldDecl *getCanonicalDecl() override { return getFirstDecl(); } |
2935 | const FieldDecl *getCanonicalDecl() const { return getFirstDecl(); } |
2936 | |
2937 | // Implement isa/cast/dyncast/etc. |
2938 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
2939 | static bool classofKind(Kind K) { return K >= firstField && K <= lastField; } |
2940 | }; |
2941 | |
2942 | /// An instance of this object exists for each enum constant |
2943 | /// that is defined. For example, in "enum X {a,b}", each of a/b are |
2944 | /// EnumConstantDecl's, X is an instance of EnumDecl, and the type of a/b is a |
2945 | /// TagType for the X EnumDecl. |
2946 | class EnumConstantDecl : public ValueDecl, public Mergeable<EnumConstantDecl> { |
2947 | Stmt *Init; // an integer constant expression |
2948 | llvm::APSInt Val; // The value. |
2949 | |
2950 | protected: |
2951 | EnumConstantDecl(DeclContext *DC, SourceLocation L, |
2952 | IdentifierInfo *Id, QualType T, Expr *E, |
2953 | const llvm::APSInt &V) |
2954 | : ValueDecl(EnumConstant, DC, L, Id, T), Init((Stmt*)E), Val(V) {} |
2955 | |
2956 | public: |
2957 | friend class StmtIteratorBase; |
2958 | |
2959 | static EnumConstantDecl *Create(ASTContext &C, EnumDecl *DC, |
2960 | SourceLocation L, IdentifierInfo *Id, |
2961 | QualType T, Expr *E, |
2962 | const llvm::APSInt &V); |
2963 | static EnumConstantDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
2964 | |
2965 | const Expr *getInitExpr() const { return (const Expr*) Init; } |
2966 | Expr *getInitExpr() { return (Expr*) Init; } |
2967 | const llvm::APSInt &getInitVal() const { return Val; } |
2968 | |
2969 | void setInitExpr(Expr *E) { Init = (Stmt*) E; } |
2970 | void setInitVal(const llvm::APSInt &V) { Val = V; } |
2971 | |
2972 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
2973 | |
2974 | /// Retrieves the canonical declaration of this enumerator. |
2975 | EnumConstantDecl *getCanonicalDecl() override { return getFirstDecl(); } |
2976 | const EnumConstantDecl *getCanonicalDecl() const { return getFirstDecl(); } |
2977 | |
2978 | // Implement isa/cast/dyncast/etc. |
2979 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
2980 | static bool classofKind(Kind K) { return K == EnumConstant; } |
2981 | }; |
2982 | |
2983 | /// Represents a field injected from an anonymous union/struct into the parent |
2984 | /// scope. These are always implicit. |
2985 | class IndirectFieldDecl : public ValueDecl, |
2986 | public Mergeable<IndirectFieldDecl> { |
2987 | NamedDecl **Chaining; |
2988 | unsigned ChainingSize; |
2989 | |
2990 | IndirectFieldDecl(ASTContext &C, DeclContext *DC, SourceLocation L, |
2991 | DeclarationName N, QualType T, |
2992 | MutableArrayRef<NamedDecl *> CH); |
2993 | |
2994 | void anchor() override; |
2995 | |
2996 | public: |
2997 | friend class ASTDeclReader; |
2998 | |
2999 | static IndirectFieldDecl *Create(ASTContext &C, DeclContext *DC, |
3000 | SourceLocation L, IdentifierInfo *Id, |
3001 | QualType T, llvm::MutableArrayRef<NamedDecl *> CH); |
3002 | |
3003 | static IndirectFieldDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
3004 | |
3005 | using chain_iterator = ArrayRef<NamedDecl *>::const_iterator; |
3006 | |
3007 | ArrayRef<NamedDecl *> chain() const { |
3008 | return llvm::makeArrayRef(Chaining, ChainingSize); |
3009 | } |
3010 | chain_iterator chain_begin() const { return chain().begin(); } |
3011 | chain_iterator chain_end() const { return chain().end(); } |
3012 | |
3013 | unsigned getChainingSize() const { return ChainingSize; } |
3014 | |
3015 | FieldDecl *getAnonField() const { |
3016 | assert(chain().size() >= 2)((chain().size() >= 2) ? static_cast<void> (0) : __assert_fail ("chain().size() >= 2", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 3016, __PRETTY_FUNCTION__)); |
3017 | return cast<FieldDecl>(chain().back()); |
3018 | } |
3019 | |
3020 | VarDecl *getVarDecl() const { |
3021 | assert(chain().size() >= 2)((chain().size() >= 2) ? static_cast<void> (0) : __assert_fail ("chain().size() >= 2", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 3021, __PRETTY_FUNCTION__)); |
3022 | return dyn_cast<VarDecl>(chain().front()); |
3023 | } |
3024 | |
3025 | IndirectFieldDecl *getCanonicalDecl() override { return getFirstDecl(); } |
3026 | const IndirectFieldDecl *getCanonicalDecl() const { return getFirstDecl(); } |
3027 | |
3028 | // Implement isa/cast/dyncast/etc. |
3029 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3030 | static bool classofKind(Kind K) { return K == IndirectField; } |
3031 | }; |
3032 | |
3033 | /// Represents a declaration of a type. |
3034 | class TypeDecl : public NamedDecl { |
3035 | friend class ASTContext; |
3036 | |
3037 | /// This indicates the Type object that represents |
3038 | /// this TypeDecl. It is a cache maintained by |
3039 | /// ASTContext::getTypedefType, ASTContext::getTagDeclType, and |
3040 | /// ASTContext::getTemplateTypeParmType, and TemplateTypeParmDecl. |
3041 | mutable const Type *TypeForDecl = nullptr; |
3042 | |
3043 | /// The start of the source range for this declaration. |
3044 | SourceLocation LocStart; |
3045 | |
3046 | void anchor() override; |
3047 | |
3048 | protected: |
3049 | TypeDecl(Kind DK, DeclContext *DC, SourceLocation L, IdentifierInfo *Id, |
3050 | SourceLocation StartL = SourceLocation()) |
3051 | : NamedDecl(DK, DC, L, Id), LocStart(StartL) {} |
3052 | |
3053 | public: |
3054 | // Low-level accessor. If you just want the type defined by this node, |
3055 | // check out ASTContext::getTypeDeclType or one of |
3056 | // ASTContext::getTypedefType, ASTContext::getRecordType, etc. if you |
3057 | // already know the specific kind of node this is. |
3058 | const Type *getTypeForDecl() const { return TypeForDecl; } |
3059 | void setTypeForDecl(const Type *TD) { TypeForDecl = TD; } |
3060 | |
3061 | SourceLocation getBeginLoc() const LLVM_READONLY__attribute__((__pure__)) { return LocStart; } |
3062 | void setLocStart(SourceLocation L) { LocStart = L; } |
3063 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) { |
3064 | if (LocStart.isValid()) |
3065 | return SourceRange(LocStart, getLocation()); |
3066 | else |
3067 | return SourceRange(getLocation()); |
3068 | } |
3069 | |
3070 | // Implement isa/cast/dyncast/etc. |
3071 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3072 | static bool classofKind(Kind K) { return K >= firstType && K <= lastType; } |
3073 | }; |
3074 | |
3075 | /// Base class for declarations which introduce a typedef-name. |
3076 | class TypedefNameDecl : public TypeDecl, public Redeclarable<TypedefNameDecl> { |
3077 | struct alignas(8) ModedTInfo { |
3078 | TypeSourceInfo *first; |
3079 | QualType second; |
3080 | }; |
3081 | |
3082 | /// If int part is 0, we have not computed IsTransparentTag. |
3083 | /// Otherwise, IsTransparentTag is (getInt() >> 1). |
3084 | mutable llvm::PointerIntPair< |
3085 | llvm::PointerUnion<TypeSourceInfo *, ModedTInfo *>, 2> |
3086 | MaybeModedTInfo; |
3087 | |
3088 | void anchor() override; |
3089 | |
3090 | protected: |
3091 | TypedefNameDecl(Kind DK, ASTContext &C, DeclContext *DC, |
3092 | SourceLocation StartLoc, SourceLocation IdLoc, |
3093 | IdentifierInfo *Id, TypeSourceInfo *TInfo) |
3094 | : TypeDecl(DK, DC, IdLoc, Id, StartLoc), redeclarable_base(C), |
3095 | MaybeModedTInfo(TInfo, 0) {} |
3096 | |
3097 | using redeclarable_base = Redeclarable<TypedefNameDecl>; |
3098 | |
3099 | TypedefNameDecl *getNextRedeclarationImpl() override { |
3100 | return getNextRedeclaration(); |
3101 | } |
3102 | |
3103 | TypedefNameDecl *getPreviousDeclImpl() override { |
3104 | return getPreviousDecl(); |
3105 | } |
3106 | |
3107 | TypedefNameDecl *getMostRecentDeclImpl() override { |
3108 | return getMostRecentDecl(); |
3109 | } |
3110 | |
3111 | public: |
3112 | using redecl_range = redeclarable_base::redecl_range; |
3113 | using redecl_iterator = redeclarable_base::redecl_iterator; |
3114 | |
3115 | using redeclarable_base::redecls_begin; |
3116 | using redeclarable_base::redecls_end; |
3117 | using redeclarable_base::redecls; |
3118 | using redeclarable_base::getPreviousDecl; |
3119 | using redeclarable_base::getMostRecentDecl; |
3120 | using redeclarable_base::isFirstDecl; |
3121 | |
3122 | bool isModed() const { |
3123 | return MaybeModedTInfo.getPointer().is<ModedTInfo *>(); |
3124 | } |
3125 | |
3126 | TypeSourceInfo *getTypeSourceInfo() const { |
3127 | return isModed() ? MaybeModedTInfo.getPointer().get<ModedTInfo *>()->first |
3128 | : MaybeModedTInfo.getPointer().get<TypeSourceInfo *>(); |
3129 | } |
3130 | |
3131 | QualType getUnderlyingType() const { |
3132 | return isModed() ? MaybeModedTInfo.getPointer().get<ModedTInfo *>()->second |
3133 | : MaybeModedTInfo.getPointer() |
3134 | .get<TypeSourceInfo *>() |
3135 | ->getType(); |
3136 | } |
3137 | |
3138 | void setTypeSourceInfo(TypeSourceInfo *newType) { |
3139 | MaybeModedTInfo.setPointer(newType); |
3140 | } |
3141 | |
3142 | void setModedTypeSourceInfo(TypeSourceInfo *unmodedTSI, QualType modedTy) { |
3143 | MaybeModedTInfo.setPointer(new (getASTContext(), 8) |
3144 | ModedTInfo({unmodedTSI, modedTy})); |
3145 | } |
3146 | |
3147 | /// Retrieves the canonical declaration of this typedef-name. |
3148 | TypedefNameDecl *getCanonicalDecl() override { return getFirstDecl(); } |
3149 | const TypedefNameDecl *getCanonicalDecl() const { return getFirstDecl(); } |
3150 | |
3151 | /// Retrieves the tag declaration for which this is the typedef name for |
3152 | /// linkage purposes, if any. |
3153 | /// |
3154 | /// \param AnyRedecl Look for the tag declaration in any redeclaration of |
3155 | /// this typedef declaration. |
3156 | TagDecl *getAnonDeclWithTypedefName(bool AnyRedecl = false) const; |
3157 | |
3158 | /// Determines if this typedef shares a name and spelling location with its |
3159 | /// underlying tag type, as is the case with the NS_ENUM macro. |
3160 | bool isTransparentTag() const { |
3161 | if (MaybeModedTInfo.getInt()) |
3162 | return MaybeModedTInfo.getInt() & 0x2; |
3163 | return isTransparentTagSlow(); |
3164 | } |
3165 | |
3166 | // Implement isa/cast/dyncast/etc. |
3167 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3168 | static bool classofKind(Kind K) { |
3169 | return K >= firstTypedefName && K <= lastTypedefName; |
3170 | } |
3171 | |
3172 | private: |
3173 | bool isTransparentTagSlow() const; |
3174 | }; |
3175 | |
3176 | /// Represents the declaration of a typedef-name via the 'typedef' |
3177 | /// type specifier. |
3178 | class TypedefDecl : public TypedefNameDecl { |
3179 | TypedefDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
3180 | SourceLocation IdLoc, IdentifierInfo *Id, TypeSourceInfo *TInfo) |
3181 | : TypedefNameDecl(Typedef, C, DC, StartLoc, IdLoc, Id, TInfo) {} |
3182 | |
3183 | public: |
3184 | static TypedefDecl *Create(ASTContext &C, DeclContext *DC, |
3185 | SourceLocation StartLoc, SourceLocation IdLoc, |
3186 | IdentifierInfo *Id, TypeSourceInfo *TInfo); |
3187 | static TypedefDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
3188 | |
3189 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
3190 | |
3191 | // Implement isa/cast/dyncast/etc. |
3192 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3193 | static bool classofKind(Kind K) { return K == Typedef; } |
3194 | }; |
3195 | |
3196 | /// Represents the declaration of a typedef-name via a C++11 |
3197 | /// alias-declaration. |
3198 | class TypeAliasDecl : public TypedefNameDecl { |
3199 | /// The template for which this is the pattern, if any. |
3200 | TypeAliasTemplateDecl *Template; |
3201 | |
3202 | TypeAliasDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
3203 | SourceLocation IdLoc, IdentifierInfo *Id, TypeSourceInfo *TInfo) |
3204 | : TypedefNameDecl(TypeAlias, C, DC, StartLoc, IdLoc, Id, TInfo), |
3205 | Template(nullptr) {} |
3206 | |
3207 | public: |
3208 | static TypeAliasDecl *Create(ASTContext &C, DeclContext *DC, |
3209 | SourceLocation StartLoc, SourceLocation IdLoc, |
3210 | IdentifierInfo *Id, TypeSourceInfo *TInfo); |
3211 | static TypeAliasDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
3212 | |
3213 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
3214 | |
3215 | TypeAliasTemplateDecl *getDescribedAliasTemplate() const { return Template; } |
3216 | void setDescribedAliasTemplate(TypeAliasTemplateDecl *TAT) { Template = TAT; } |
3217 | |
3218 | // Implement isa/cast/dyncast/etc. |
3219 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3220 | static bool classofKind(Kind K) { return K == TypeAlias; } |
3221 | }; |
3222 | |
3223 | /// Represents the declaration of a struct/union/class/enum. |
3224 | class TagDecl : public TypeDecl, |
3225 | public DeclContext, |
3226 | public Redeclarable<TagDecl> { |
3227 | // This class stores some data in DeclContext::TagDeclBits |
3228 | // to save some space. Use the provided accessors to access it. |
3229 | public: |
3230 | // This is really ugly. |
3231 | using TagKind = TagTypeKind; |
3232 | |
3233 | private: |
3234 | SourceRange BraceRange; |
3235 | |
3236 | // A struct representing syntactic qualifier info, |
3237 | // to be used for the (uncommon) case of out-of-line declarations. |
3238 | using ExtInfo = QualifierInfo; |
3239 | |
3240 | /// If the (out-of-line) tag declaration name |
3241 | /// is qualified, it points to the qualifier info (nns and range); |
3242 | /// otherwise, if the tag declaration is anonymous and it is part of |
3243 | /// a typedef or alias, it points to the TypedefNameDecl (used for mangling); |
3244 | /// otherwise, if the tag declaration is anonymous and it is used as a |
3245 | /// declaration specifier for variables, it points to the first VarDecl (used |
3246 | /// for mangling); |
3247 | /// otherwise, it is a null (TypedefNameDecl) pointer. |
3248 | llvm::PointerUnion<TypedefNameDecl *, ExtInfo *> TypedefNameDeclOrQualifier; |
3249 | |
3250 | bool hasExtInfo() const { return TypedefNameDeclOrQualifier.is<ExtInfo *>(); } |
3251 | ExtInfo *getExtInfo() { return TypedefNameDeclOrQualifier.get<ExtInfo *>(); } |
3252 | const ExtInfo *getExtInfo() const { |
3253 | return TypedefNameDeclOrQualifier.get<ExtInfo *>(); |
3254 | } |
3255 | |
3256 | protected: |
3257 | TagDecl(Kind DK, TagKind TK, const ASTContext &C, DeclContext *DC, |
3258 | SourceLocation L, IdentifierInfo *Id, TagDecl *PrevDecl, |
3259 | SourceLocation StartL); |
3260 | |
3261 | using redeclarable_base = Redeclarable<TagDecl>; |
3262 | |
3263 | TagDecl *getNextRedeclarationImpl() override { |
3264 | return getNextRedeclaration(); |
3265 | } |
3266 | |
3267 | TagDecl *getPreviousDeclImpl() override { |
3268 | return getPreviousDecl(); |
3269 | } |
3270 | |
3271 | TagDecl *getMostRecentDeclImpl() override { |
3272 | return getMostRecentDecl(); |
3273 | } |
3274 | |
3275 | /// Completes the definition of this tag declaration. |
3276 | /// |
3277 | /// This is a helper function for derived classes. |
3278 | void completeDefinition(); |
3279 | |
3280 | /// True if this decl is currently being defined. |
3281 | void setBeingDefined(bool V = true) { TagDeclBits.IsBeingDefined = V; } |
3282 | |
3283 | /// Indicates whether it is possible for declarations of this kind |
3284 | /// to have an out-of-date definition. |
3285 | /// |
3286 | /// This option is only enabled when modules are enabled. |
3287 | void setMayHaveOutOfDateDef(bool V = true) { |
3288 | TagDeclBits.MayHaveOutOfDateDef = V; |
3289 | } |
3290 | |
3291 | public: |
3292 | friend class ASTDeclReader; |
3293 | friend class ASTDeclWriter; |
3294 | |
3295 | using redecl_range = redeclarable_base::redecl_range; |
3296 | using redecl_iterator = redeclarable_base::redecl_iterator; |
3297 | |
3298 | using redeclarable_base::redecls_begin; |
3299 | using redeclarable_base::redecls_end; |
3300 | using redeclarable_base::redecls; |
3301 | using redeclarable_base::getPreviousDecl; |
3302 | using redeclarable_base::getMostRecentDecl; |
3303 | using redeclarable_base::isFirstDecl; |
3304 | |
3305 | SourceRange getBraceRange() const { return BraceRange; } |
3306 | void setBraceRange(SourceRange R) { BraceRange = R; } |
3307 | |
3308 | /// Return SourceLocation representing start of source |
3309 | /// range ignoring outer template declarations. |
3310 | SourceLocation getInnerLocStart() const { return getBeginLoc(); } |
3311 | |
3312 | /// Return SourceLocation representing start of source |
3313 | /// range taking into account any outer template declarations. |
3314 | SourceLocation getOuterLocStart() const; |
3315 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
3316 | |
3317 | TagDecl *getCanonicalDecl() override; |
3318 | const TagDecl *getCanonicalDecl() const { |
3319 | return const_cast<TagDecl*>(this)->getCanonicalDecl(); |
3320 | } |
3321 | |
3322 | /// Return true if this declaration is a completion definition of the type. |
3323 | /// Provided for consistency. |
3324 | bool isThisDeclarationADefinition() const { |
3325 | return isCompleteDefinition(); |
3326 | } |
3327 | |
3328 | /// Return true if this decl has its body fully specified. |
3329 | bool isCompleteDefinition() const { return TagDeclBits.IsCompleteDefinition; } |
3330 | |
3331 | /// True if this decl has its body fully specified. |
3332 | void setCompleteDefinition(bool V = true) { |
3333 | TagDeclBits.IsCompleteDefinition = V; |
3334 | } |
3335 | |
3336 | /// Return true if this complete decl is |
3337 | /// required to be complete for some existing use. |
3338 | bool isCompleteDefinitionRequired() const { |
3339 | return TagDeclBits.IsCompleteDefinitionRequired; |
3340 | } |
3341 | |
3342 | /// True if this complete decl is |
3343 | /// required to be complete for some existing use. |
3344 | void setCompleteDefinitionRequired(bool V = true) { |
3345 | TagDeclBits.IsCompleteDefinitionRequired = V; |
3346 | } |
3347 | |
3348 | /// Return true if this decl is currently being defined. |
3349 | bool isBeingDefined() const { return TagDeclBits.IsBeingDefined; } |
3350 | |
3351 | /// True if this tag declaration is "embedded" (i.e., defined or declared |
3352 | /// for the very first time) in the syntax of a declarator. |
3353 | bool isEmbeddedInDeclarator() const { |
3354 | return TagDeclBits.IsEmbeddedInDeclarator; |
3355 | } |
3356 | |
3357 | /// True if this tag declaration is "embedded" (i.e., defined or declared |
3358 | /// for the very first time) in the syntax of a declarator. |
3359 | void setEmbeddedInDeclarator(bool isInDeclarator) { |
3360 | TagDeclBits.IsEmbeddedInDeclarator = isInDeclarator; |
3361 | } |
3362 | |
3363 | /// True if this tag is free standing, e.g. "struct foo;". |
3364 | bool isFreeStanding() const { return TagDeclBits.IsFreeStanding; } |
3365 | |
3366 | /// True if this tag is free standing, e.g. "struct foo;". |
3367 | void setFreeStanding(bool isFreeStanding = true) { |
3368 | TagDeclBits.IsFreeStanding = isFreeStanding; |
3369 | } |
3370 | |
3371 | /// Indicates whether it is possible for declarations of this kind |
3372 | /// to have an out-of-date definition. |
3373 | /// |
3374 | /// This option is only enabled when modules are enabled. |
3375 | bool mayHaveOutOfDateDef() const { return TagDeclBits.MayHaveOutOfDateDef; } |
3376 | |
3377 | /// Whether this declaration declares a type that is |
3378 | /// dependent, i.e., a type that somehow depends on template |
3379 | /// parameters. |
3380 | bool isDependentType() const { return isDependentContext(); } |
3381 | |
3382 | /// Starts the definition of this tag declaration. |
3383 | /// |
3384 | /// This method should be invoked at the beginning of the definition |
3385 | /// of this tag declaration. It will set the tag type into a state |
3386 | /// where it is in the process of being defined. |
3387 | void startDefinition(); |
3388 | |
3389 | /// Returns the TagDecl that actually defines this |
3390 | /// struct/union/class/enum. When determining whether or not a |
3391 | /// struct/union/class/enum has a definition, one should use this |
3392 | /// method as opposed to 'isDefinition'. 'isDefinition' indicates |
3393 | /// whether or not a specific TagDecl is defining declaration, not |
3394 | /// whether or not the struct/union/class/enum type is defined. |
3395 | /// This method returns NULL if there is no TagDecl that defines |
3396 | /// the struct/union/class/enum. |
3397 | TagDecl *getDefinition() const; |
3398 | |
3399 | StringRef getKindName() const { |
3400 | return TypeWithKeyword::getTagTypeKindName(getTagKind()); |
3401 | } |
3402 | |
3403 | TagKind getTagKind() const { |
3404 | return static_cast<TagKind>(TagDeclBits.TagDeclKind); |
3405 | } |
3406 | |
3407 | void setTagKind(TagKind TK) { TagDeclBits.TagDeclKind = TK; } |
3408 | |
3409 | bool isStruct() const { return getTagKind() == TTK_Struct; } |
3410 | bool isInterface() const { return getTagKind() == TTK_Interface; } |
3411 | bool isClass() const { return getTagKind() == TTK_Class; } |
3412 | bool isUnion() const { return getTagKind() == TTK_Union; } |
3413 | bool isEnum() const { return getTagKind() == TTK_Enum; } |
3414 | |
3415 | /// Is this tag type named, either directly or via being defined in |
3416 | /// a typedef of this type? |
3417 | /// |
3418 | /// C++11 [basic.link]p8: |
3419 | /// A type is said to have linkage if and only if: |
3420 | /// - it is a class or enumeration type that is named (or has a |
3421 | /// name for linkage purposes) and the name has linkage; ... |
3422 | /// C++11 [dcl.typedef]p9: |
3423 | /// If the typedef declaration defines an unnamed class (or enum), |
3424 | /// the first typedef-name declared by the declaration to be that |
3425 | /// class type (or enum type) is used to denote the class type (or |
3426 | /// enum type) for linkage purposes only. |
3427 | /// |
3428 | /// C does not have an analogous rule, but the same concept is |
3429 | /// nonetheless useful in some places. |
3430 | bool hasNameForLinkage() const { |
3431 | return (getDeclName() || getTypedefNameForAnonDecl()); |
3432 | } |
3433 | |
3434 | TypedefNameDecl *getTypedefNameForAnonDecl() const { |
3435 | return hasExtInfo() ? nullptr |
3436 | : TypedefNameDeclOrQualifier.get<TypedefNameDecl *>(); |
3437 | } |
3438 | |
3439 | void setTypedefNameForAnonDecl(TypedefNameDecl *TDD); |
3440 | |
3441 | /// Retrieve the nested-name-specifier that qualifies the name of this |
3442 | /// declaration, if it was present in the source. |
3443 | NestedNameSpecifier *getQualifier() const { |
3444 | return hasExtInfo() ? getExtInfo()->QualifierLoc.getNestedNameSpecifier() |
3445 | : nullptr; |
3446 | } |
3447 | |
3448 | /// Retrieve the nested-name-specifier (with source-location |
3449 | /// information) that qualifies the name of this declaration, if it was |
3450 | /// present in the source. |
3451 | NestedNameSpecifierLoc getQualifierLoc() const { |
3452 | return hasExtInfo() ? getExtInfo()->QualifierLoc |
3453 | : NestedNameSpecifierLoc(); |
3454 | } |
3455 | |
3456 | void setQualifierInfo(NestedNameSpecifierLoc QualifierLoc); |
3457 | |
3458 | unsigned getNumTemplateParameterLists() const { |
3459 | return hasExtInfo() ? getExtInfo()->NumTemplParamLists : 0; |
3460 | } |
3461 | |
3462 | TemplateParameterList *getTemplateParameterList(unsigned i) const { |
3463 | assert(i < getNumTemplateParameterLists())((i < getNumTemplateParameterLists()) ? static_cast<void > (0) : __assert_fail ("i < getNumTemplateParameterLists()" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 3463, __PRETTY_FUNCTION__)); |
3464 | return getExtInfo()->TemplParamLists[i]; |
3465 | } |
3466 | |
3467 | void setTemplateParameterListsInfo(ASTContext &Context, |
3468 | ArrayRef<TemplateParameterList *> TPLists); |
3469 | |
3470 | // Implement isa/cast/dyncast/etc. |
3471 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3472 | static bool classofKind(Kind K) { return K >= firstTag && K <= lastTag; } |
3473 | |
3474 | static DeclContext *castToDeclContext(const TagDecl *D) { |
3475 | return static_cast<DeclContext *>(const_cast<TagDecl*>(D)); |
3476 | } |
3477 | |
3478 | static TagDecl *castFromDeclContext(const DeclContext *DC) { |
3479 | return static_cast<TagDecl *>(const_cast<DeclContext*>(DC)); |
3480 | } |
3481 | }; |
3482 | |
3483 | /// Represents an enum. In C++11, enums can be forward-declared |
3484 | /// with a fixed underlying type, and in C we allow them to be forward-declared |
3485 | /// with no underlying type as an extension. |
3486 | class EnumDecl : public TagDecl { |
3487 | // This class stores some data in DeclContext::EnumDeclBits |
3488 | // to save some space. Use the provided accessors to access it. |
3489 | |
3490 | /// This represent the integer type that the enum corresponds |
3491 | /// to for code generation purposes. Note that the enumerator constants may |
3492 | /// have a different type than this does. |
3493 | /// |
3494 | /// If the underlying integer type was explicitly stated in the source |
3495 | /// code, this is a TypeSourceInfo* for that type. Otherwise this type |
3496 | /// was automatically deduced somehow, and this is a Type*. |
3497 | /// |
3498 | /// Normally if IsFixed(), this would contain a TypeSourceInfo*, but in |
3499 | /// some cases it won't. |
3500 | /// |
3501 | /// The underlying type of an enumeration never has any qualifiers, so |
3502 | /// we can get away with just storing a raw Type*, and thus save an |
3503 | /// extra pointer when TypeSourceInfo is needed. |
3504 | llvm::PointerUnion<const Type *, TypeSourceInfo *> IntegerType; |
3505 | |
3506 | /// The integer type that values of this type should |
3507 | /// promote to. In C, enumerators are generally of an integer type |
3508 | /// directly, but gcc-style large enumerators (and all enumerators |
3509 | /// in C++) are of the enum type instead. |
3510 | QualType PromotionType; |
3511 | |
3512 | /// If this enumeration is an instantiation of a member enumeration |
3513 | /// of a class template specialization, this is the member specialization |
3514 | /// information. |
3515 | MemberSpecializationInfo *SpecializationInfo = nullptr; |
3516 | |
3517 | /// Store the ODRHash after first calculation. |
3518 | /// The corresponding flag HasODRHash is in EnumDeclBits |
3519 | /// and can be accessed with the provided accessors. |
3520 | unsigned ODRHash; |
3521 | |
3522 | EnumDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc, |
3523 | SourceLocation IdLoc, IdentifierInfo *Id, EnumDecl *PrevDecl, |
3524 | bool Scoped, bool ScopedUsingClassTag, bool Fixed); |
3525 | |
3526 | void anchor() override; |
3527 | |
3528 | void setInstantiationOfMemberEnum(ASTContext &C, EnumDecl *ED, |
3529 | TemplateSpecializationKind TSK); |
3530 | |
3531 | /// Sets the width in bits required to store all the |
3532 | /// non-negative enumerators of this enum. |
3533 | void setNumPositiveBits(unsigned Num) { |
3534 | EnumDeclBits.NumPositiveBits = Num; |
3535 | 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-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 3535, __PRETTY_FUNCTION__)); |
3536 | } |
3537 | |
3538 | /// Returns the width in bits required to store all the |
3539 | /// negative enumerators of this enum. (see getNumNegativeBits) |
3540 | void setNumNegativeBits(unsigned Num) { EnumDeclBits.NumNegativeBits = Num; } |
3541 | |
3542 | /// True if this tag declaration is a scoped enumeration. Only |
3543 | /// possible in C++11 mode. |
3544 | void setScoped(bool Scoped = true) { EnumDeclBits.IsScoped = Scoped; } |
3545 | |
3546 | /// If this tag declaration is a scoped enum, |
3547 | /// then this is true if the scoped enum was declared using the class |
3548 | /// tag, false if it was declared with the struct tag. No meaning is |
3549 | /// associated if this tag declaration is not a scoped enum. |
3550 | void setScopedUsingClassTag(bool ScopedUCT = true) { |
3551 | EnumDeclBits.IsScopedUsingClassTag = ScopedUCT; |
3552 | } |
3553 | |
3554 | /// True if this is an Objective-C, C++11, or |
3555 | /// Microsoft-style enumeration with a fixed underlying type. |
3556 | void setFixed(bool Fixed = true) { EnumDeclBits.IsFixed = Fixed; } |
3557 | |
3558 | /// True if a valid hash is stored in ODRHash. |
3559 | bool hasODRHash() const { return EnumDeclBits.HasODRHash; } |
3560 | void setHasODRHash(bool Hash = true) { EnumDeclBits.HasODRHash = Hash; } |
3561 | |
3562 | public: |
3563 | friend class ASTDeclReader; |
3564 | |
3565 | EnumDecl *getCanonicalDecl() override { |
3566 | return cast<EnumDecl>(TagDecl::getCanonicalDecl()); |
3567 | } |
3568 | const EnumDecl *getCanonicalDecl() const { |
3569 | return const_cast<EnumDecl*>(this)->getCanonicalDecl(); |
3570 | } |
3571 | |
3572 | EnumDecl *getPreviousDecl() { |
3573 | return cast_or_null<EnumDecl>( |
3574 | static_cast<TagDecl *>(this)->getPreviousDecl()); |
3575 | } |
3576 | const EnumDecl *getPreviousDecl() const { |
3577 | return const_cast<EnumDecl*>(this)->getPreviousDecl(); |
3578 | } |
3579 | |
3580 | EnumDecl *getMostRecentDecl() { |
3581 | return cast<EnumDecl>(static_cast<TagDecl *>(this)->getMostRecentDecl()); |
3582 | } |
3583 | const EnumDecl *getMostRecentDecl() const { |
3584 | return const_cast<EnumDecl*>(this)->getMostRecentDecl(); |
3585 | } |
3586 | |
3587 | EnumDecl *getDefinition() const { |
3588 | return cast_or_null<EnumDecl>(TagDecl::getDefinition()); |
3589 | } |
3590 | |
3591 | static EnumDecl *Create(ASTContext &C, DeclContext *DC, |
3592 | SourceLocation StartLoc, SourceLocation IdLoc, |
3593 | IdentifierInfo *Id, EnumDecl *PrevDecl, |
3594 | bool IsScoped, bool IsScopedUsingClassTag, |
3595 | bool IsFixed); |
3596 | static EnumDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
3597 | |
3598 | /// When created, the EnumDecl corresponds to a |
3599 | /// forward-declared enum. This method is used to mark the |
3600 | /// declaration as being defined; its enumerators have already been |
3601 | /// added (via DeclContext::addDecl). NewType is the new underlying |
3602 | /// type of the enumeration type. |
3603 | void completeDefinition(QualType NewType, |
3604 | QualType PromotionType, |
3605 | unsigned NumPositiveBits, |
3606 | unsigned NumNegativeBits); |
3607 | |
3608 | // Iterates through the enumerators of this enumeration. |
3609 | using enumerator_iterator = specific_decl_iterator<EnumConstantDecl>; |
3610 | using enumerator_range = |
3611 | llvm::iterator_range<specific_decl_iterator<EnumConstantDecl>>; |
3612 | |
3613 | enumerator_range enumerators() const { |
3614 | return enumerator_range(enumerator_begin(), enumerator_end()); |
3615 | } |
3616 | |
3617 | enumerator_iterator enumerator_begin() const { |
3618 | const EnumDecl *E = getDefinition(); |
3619 | if (!E) |
3620 | E = this; |
3621 | return enumerator_iterator(E->decls_begin()); |
3622 | } |
3623 | |
3624 | enumerator_iterator enumerator_end() const { |
3625 | const EnumDecl *E = getDefinition(); |
3626 | if (!E) |
3627 | E = this; |
3628 | return enumerator_iterator(E->decls_end()); |
3629 | } |
3630 | |
3631 | /// Return the integer type that enumerators should promote to. |
3632 | QualType getPromotionType() const { return PromotionType; } |
3633 | |
3634 | /// Set the promotion type. |
3635 | void setPromotionType(QualType T) { PromotionType = T; } |
3636 | |
3637 | /// Return the integer type this enum decl corresponds to. |
3638 | /// This returns a null QualType for an enum forward definition with no fixed |
3639 | /// underlying type. |
3640 | QualType getIntegerType() const { |
3641 | if (!IntegerType) |
3642 | return QualType(); |
3643 | if (const Type *T = IntegerType.dyn_cast<const Type*>()) |
3644 | return QualType(T, 0); |
3645 | return IntegerType.get<TypeSourceInfo*>()->getType().getUnqualifiedType(); |
3646 | } |
3647 | |
3648 | /// Set the underlying integer type. |
3649 | void setIntegerType(QualType T) { IntegerType = T.getTypePtrOrNull(); } |
3650 | |
3651 | /// Set the underlying integer type source info. |
3652 | void setIntegerTypeSourceInfo(TypeSourceInfo *TInfo) { IntegerType = TInfo; } |
3653 | |
3654 | /// Return the type source info for the underlying integer type, |
3655 | /// if no type source info exists, return 0. |
3656 | TypeSourceInfo *getIntegerTypeSourceInfo() const { |
3657 | return IntegerType.dyn_cast<TypeSourceInfo*>(); |
3658 | } |
3659 | |
3660 | /// Retrieve the source range that covers the underlying type if |
3661 | /// specified. |
3662 | SourceRange getIntegerTypeRange() const LLVM_READONLY__attribute__((__pure__)); |
3663 | |
3664 | /// Returns the width in bits required to store all the |
3665 | /// non-negative enumerators of this enum. |
3666 | unsigned getNumPositiveBits() const { return EnumDeclBits.NumPositiveBits; } |
3667 | |
3668 | /// Returns the width in bits required to store all the |
3669 | /// negative enumerators of this enum. These widths include |
3670 | /// the rightmost leading 1; that is: |
3671 | /// |
3672 | /// MOST NEGATIVE ENUMERATOR PATTERN NUM NEGATIVE BITS |
3673 | /// ------------------------ ------- ----------------- |
3674 | /// -1 1111111 1 |
3675 | /// -10 1110110 5 |
3676 | /// -101 1001011 8 |
3677 | unsigned getNumNegativeBits() const { return EnumDeclBits.NumNegativeBits; } |
3678 | |
3679 | /// Returns true if this is a C++11 scoped enumeration. |
3680 | bool isScoped() const { return EnumDeclBits.IsScoped; } |
3681 | |
3682 | /// Returns true if this is a C++11 scoped enumeration. |
3683 | bool isScopedUsingClassTag() const { |
3684 | return EnumDeclBits.IsScopedUsingClassTag; |
3685 | } |
3686 | |
3687 | /// Returns true if this is an Objective-C, C++11, or |
3688 | /// Microsoft-style enumeration with a fixed underlying type. |
3689 | bool isFixed() const { return EnumDeclBits.IsFixed; } |
3690 | |
3691 | unsigned getODRHash(); |
3692 | |
3693 | /// Returns true if this can be considered a complete type. |
3694 | bool isComplete() const { |
3695 | // IntegerType is set for fixed type enums and non-fixed but implicitly |
3696 | // int-sized Microsoft enums. |
3697 | return isCompleteDefinition() || IntegerType; |
3698 | } |
3699 | |
3700 | /// Returns true if this enum is either annotated with |
3701 | /// enum_extensibility(closed) or isn't annotated with enum_extensibility. |
3702 | bool isClosed() const; |
3703 | |
3704 | /// Returns true if this enum is annotated with flag_enum and isn't annotated |
3705 | /// with enum_extensibility(open). |
3706 | bool isClosedFlag() const; |
3707 | |
3708 | /// Returns true if this enum is annotated with neither flag_enum nor |
3709 | /// enum_extensibility(open). |
3710 | bool isClosedNonFlag() const; |
3711 | |
3712 | /// Retrieve the enum definition from which this enumeration could |
3713 | /// be instantiated, if it is an instantiation (rather than a non-template). |
3714 | EnumDecl *getTemplateInstantiationPattern() const; |
3715 | |
3716 | /// Returns the enumeration (declared within the template) |
3717 | /// from which this enumeration type was instantiated, or NULL if |
3718 | /// this enumeration was not instantiated from any template. |
3719 | EnumDecl *getInstantiatedFromMemberEnum() const; |
3720 | |
3721 | /// If this enumeration is a member of a specialization of a |
3722 | /// templated class, determine what kind of template specialization |
3723 | /// or instantiation this is. |
3724 | TemplateSpecializationKind getTemplateSpecializationKind() const; |
3725 | |
3726 | /// For an enumeration member that was instantiated from a member |
3727 | /// enumeration of a templated class, set the template specialiation kind. |
3728 | void setTemplateSpecializationKind(TemplateSpecializationKind TSK, |
3729 | SourceLocation PointOfInstantiation = SourceLocation()); |
3730 | |
3731 | /// If this enumeration is an instantiation of a member enumeration of |
3732 | /// a class template specialization, retrieves the member specialization |
3733 | /// information. |
3734 | MemberSpecializationInfo *getMemberSpecializationInfo() const { |
3735 | return SpecializationInfo; |
3736 | } |
3737 | |
3738 | /// Specify that this enumeration is an instantiation of the |
3739 | /// member enumeration ED. |
3740 | void setInstantiationOfMemberEnum(EnumDecl *ED, |
3741 | TemplateSpecializationKind TSK) { |
3742 | setInstantiationOfMemberEnum(getASTContext(), ED, TSK); |
3743 | } |
3744 | |
3745 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3746 | static bool classofKind(Kind K) { return K == Enum; } |
3747 | }; |
3748 | |
3749 | /// Represents a struct/union/class. For example: |
3750 | /// struct X; // Forward declaration, no "body". |
3751 | /// union Y { int A, B; }; // Has body with members A and B (FieldDecls). |
3752 | /// This decl will be marked invalid if *any* members are invalid. |
3753 | class RecordDecl : public TagDecl { |
3754 | // This class stores some data in DeclContext::RecordDeclBits |
3755 | // to save some space. Use the provided accessors to access it. |
3756 | public: |
3757 | friend class DeclContext; |
3758 | /// Enum that represents the different ways arguments are passed to and |
3759 | /// returned from function calls. This takes into account the target-specific |
3760 | /// and version-specific rules along with the rules determined by the |
3761 | /// language. |
3762 | enum ArgPassingKind : unsigned { |
3763 | /// The argument of this type can be passed directly in registers. |
3764 | APK_CanPassInRegs, |
3765 | |
3766 | /// The argument of this type cannot be passed directly in registers. |
3767 | /// Records containing this type as a subobject are not forced to be passed |
3768 | /// indirectly. This value is used only in C++. This value is required by |
3769 | /// C++ because, in uncommon situations, it is possible for a class to have |
3770 | /// only trivial copy/move constructors even when one of its subobjects has |
3771 | /// a non-trivial copy/move constructor (if e.g. the corresponding copy/move |
3772 | /// constructor in the derived class is deleted). |
3773 | APK_CannotPassInRegs, |
3774 | |
3775 | /// The argument of this type cannot be passed directly in registers. |
3776 | /// Records containing this type as a subobject are forced to be passed |
3777 | /// indirectly. |
3778 | APK_CanNeverPassInRegs |
3779 | }; |
3780 | |
3781 | protected: |
3782 | RecordDecl(Kind DK, TagKind TK, const ASTContext &C, DeclContext *DC, |
3783 | SourceLocation StartLoc, SourceLocation IdLoc, |
3784 | IdentifierInfo *Id, RecordDecl *PrevDecl); |
3785 | |
3786 | public: |
3787 | static RecordDecl *Create(const ASTContext &C, TagKind TK, DeclContext *DC, |
3788 | SourceLocation StartLoc, SourceLocation IdLoc, |
3789 | IdentifierInfo *Id, RecordDecl* PrevDecl = nullptr); |
3790 | static RecordDecl *CreateDeserialized(const ASTContext &C, unsigned ID); |
3791 | |
3792 | RecordDecl *getPreviousDecl() { |
3793 | return cast_or_null<RecordDecl>( |
3794 | static_cast<TagDecl *>(this)->getPreviousDecl()); |
3795 | } |
3796 | const RecordDecl *getPreviousDecl() const { |
3797 | return const_cast<RecordDecl*>(this)->getPreviousDecl(); |
3798 | } |
3799 | |
3800 | RecordDecl *getMostRecentDecl() { |
3801 | return cast<RecordDecl>(static_cast<TagDecl *>(this)->getMostRecentDecl()); |
3802 | } |
3803 | const RecordDecl *getMostRecentDecl() const { |
3804 | return const_cast<RecordDecl*>(this)->getMostRecentDecl(); |
3805 | } |
3806 | |
3807 | bool hasFlexibleArrayMember() const { |
3808 | return RecordDeclBits.HasFlexibleArrayMember; |
3809 | } |
3810 | |
3811 | void setHasFlexibleArrayMember(bool V) { |
3812 | RecordDeclBits.HasFlexibleArrayMember = V; |
3813 | } |
3814 | |
3815 | /// Whether this is an anonymous struct or union. To be an anonymous |
3816 | /// struct or union, it must have been declared without a name and |
3817 | /// there must be no objects of this type declared, e.g., |
3818 | /// @code |
3819 | /// union { int i; float f; }; |
3820 | /// @endcode |
3821 | /// is an anonymous union but neither of the following are: |
3822 | /// @code |
3823 | /// union X { int i; float f; }; |
3824 | /// union { int i; float f; } obj; |
3825 | /// @endcode |
3826 | bool isAnonymousStructOrUnion() const { |
3827 | return RecordDeclBits.AnonymousStructOrUnion; |
3828 | } |
3829 | |
3830 | void setAnonymousStructOrUnion(bool Anon) { |
3831 | RecordDeclBits.AnonymousStructOrUnion = Anon; |
3832 | } |
3833 | |
3834 | bool hasObjectMember() const { return RecordDeclBits.HasObjectMember; } |
3835 | void setHasObjectMember(bool val) { RecordDeclBits.HasObjectMember = val; } |
3836 | |
3837 | bool hasVolatileMember() const { return RecordDeclBits.HasVolatileMember; } |
3838 | |
3839 | void setHasVolatileMember(bool val) { |
3840 | RecordDeclBits.HasVolatileMember = val; |
3841 | } |
3842 | |
3843 | bool hasLoadedFieldsFromExternalStorage() const { |
3844 | return RecordDeclBits.LoadedFieldsFromExternalStorage; |
3845 | } |
3846 | |
3847 | void setHasLoadedFieldsFromExternalStorage(bool val) const { |
3848 | RecordDeclBits.LoadedFieldsFromExternalStorage = val; |
3849 | } |
3850 | |
3851 | /// Functions to query basic properties of non-trivial C structs. |
3852 | bool isNonTrivialToPrimitiveDefaultInitialize() const { |
3853 | return RecordDeclBits.NonTrivialToPrimitiveDefaultInitialize; |
3854 | } |
3855 | |
3856 | void setNonTrivialToPrimitiveDefaultInitialize(bool V) { |
3857 | RecordDeclBits.NonTrivialToPrimitiveDefaultInitialize = V; |
3858 | } |
3859 | |
3860 | bool isNonTrivialToPrimitiveCopy() const { |
3861 | return RecordDeclBits.NonTrivialToPrimitiveCopy; |
3862 | } |
3863 | |
3864 | void setNonTrivialToPrimitiveCopy(bool V) { |
3865 | RecordDeclBits.NonTrivialToPrimitiveCopy = V; |
3866 | } |
3867 | |
3868 | bool isNonTrivialToPrimitiveDestroy() const { |
3869 | return RecordDeclBits.NonTrivialToPrimitiveDestroy; |
3870 | } |
3871 | |
3872 | void setNonTrivialToPrimitiveDestroy(bool V) { |
3873 | RecordDeclBits.NonTrivialToPrimitiveDestroy = V; |
3874 | } |
3875 | |
3876 | bool hasNonTrivialToPrimitiveDefaultInitializeCUnion() const { |
3877 | return RecordDeclBits.HasNonTrivialToPrimitiveDefaultInitializeCUnion; |
3878 | } |
3879 | |
3880 | void setHasNonTrivialToPrimitiveDefaultInitializeCUnion(bool V) { |
3881 | RecordDeclBits.HasNonTrivialToPrimitiveDefaultInitializeCUnion = V; |
3882 | } |
3883 | |
3884 | bool hasNonTrivialToPrimitiveDestructCUnion() const { |
3885 | return RecordDeclBits.HasNonTrivialToPrimitiveDestructCUnion; |
3886 | } |
3887 | |
3888 | void setHasNonTrivialToPrimitiveDestructCUnion(bool V) { |
3889 | RecordDeclBits.HasNonTrivialToPrimitiveDestructCUnion = V; |
3890 | } |
3891 | |
3892 | bool hasNonTrivialToPrimitiveCopyCUnion() const { |
3893 | return RecordDeclBits.HasNonTrivialToPrimitiveCopyCUnion; |
3894 | } |
3895 | |
3896 | void setHasNonTrivialToPrimitiveCopyCUnion(bool V) { |
3897 | RecordDeclBits.HasNonTrivialToPrimitiveCopyCUnion = V; |
3898 | } |
3899 | |
3900 | /// Determine whether this class can be passed in registers. In C++ mode, |
3901 | /// it must have at least one trivial, non-deleted copy or move constructor. |
3902 | /// FIXME: This should be set as part of completeDefinition. |
3903 | bool canPassInRegisters() const { |
3904 | return getArgPassingRestrictions() == APK_CanPassInRegs; |
3905 | } |
3906 | |
3907 | ArgPassingKind getArgPassingRestrictions() const { |
3908 | return static_cast<ArgPassingKind>(RecordDeclBits.ArgPassingRestrictions); |
3909 | } |
3910 | |
3911 | void setArgPassingRestrictions(ArgPassingKind Kind) { |
3912 | RecordDeclBits.ArgPassingRestrictions = Kind; |
3913 | } |
3914 | |
3915 | bool isParamDestroyedInCallee() const { |
3916 | return RecordDeclBits.ParamDestroyedInCallee; |
3917 | } |
3918 | |
3919 | void setParamDestroyedInCallee(bool V) { |
3920 | RecordDeclBits.ParamDestroyedInCallee = V; |
3921 | } |
3922 | |
3923 | /// Determines whether this declaration represents the |
3924 | /// injected class name. |
3925 | /// |
3926 | /// The injected class name in C++ is the name of the class that |
3927 | /// appears inside the class itself. For example: |
3928 | /// |
3929 | /// \code |
3930 | /// struct C { |
3931 | /// // C is implicitly declared here as a synonym for the class name. |
3932 | /// }; |
3933 | /// |
3934 | /// C::C c; // same as "C c;" |
3935 | /// \endcode |
3936 | bool isInjectedClassName() const; |
3937 | |
3938 | /// Determine whether this record is a class describing a lambda |
3939 | /// function object. |
3940 | bool isLambda() const; |
3941 | |
3942 | /// Determine whether this record is a record for captured variables in |
3943 | /// CapturedStmt construct. |
3944 | bool isCapturedRecord() const; |
3945 | |
3946 | /// Mark the record as a record for captured variables in CapturedStmt |
3947 | /// construct. |
3948 | void setCapturedRecord(); |
3949 | |
3950 | /// Returns the RecordDecl that actually defines |
3951 | /// this struct/union/class. When determining whether or not a |
3952 | /// struct/union/class is completely defined, one should use this |
3953 | /// method as opposed to 'isCompleteDefinition'. |
3954 | /// 'isCompleteDefinition' indicates whether or not a specific |
3955 | /// RecordDecl is a completed definition, not whether or not the |
3956 | /// record type is defined. This method returns NULL if there is |
3957 | /// no RecordDecl that defines the struct/union/tag. |
3958 | RecordDecl *getDefinition() const { |
3959 | return cast_or_null<RecordDecl>(TagDecl::getDefinition()); |
3960 | } |
3961 | |
3962 | // Iterator access to field members. The field iterator only visits |
3963 | // the non-static data members of this class, ignoring any static |
3964 | // data members, functions, constructors, destructors, etc. |
3965 | using field_iterator = specific_decl_iterator<FieldDecl>; |
3966 | using field_range = llvm::iterator_range<specific_decl_iterator<FieldDecl>>; |
3967 | |
3968 | field_range fields() const { return field_range(field_begin(), field_end()); } |
3969 | field_iterator field_begin() const; |
3970 | |
3971 | field_iterator field_end() const { |
3972 | return field_iterator(decl_iterator()); |
3973 | } |
3974 | |
3975 | // Whether there are any fields (non-static data members) in this record. |
3976 | bool field_empty() const { |
3977 | return field_begin() == field_end(); |
3978 | } |
3979 | |
3980 | /// Note that the definition of this type is now complete. |
3981 | virtual void completeDefinition(); |
3982 | |
3983 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
3984 | static bool classofKind(Kind K) { |
3985 | return K >= firstRecord && K <= lastRecord; |
3986 | } |
3987 | |
3988 | /// Get whether or not this is an ms_struct which can |
3989 | /// be turned on with an attribute, pragma, or -mms-bitfields |
3990 | /// commandline option. |
3991 | bool isMsStruct(const ASTContext &C) const; |
3992 | |
3993 | /// Whether we are allowed to insert extra padding between fields. |
3994 | /// These padding are added to help AddressSanitizer detect |
3995 | /// intra-object-overflow bugs. |
3996 | bool mayInsertExtraPadding(bool EmitRemark = false) const; |
3997 | |
3998 | /// Finds the first data member which has a name. |
3999 | /// nullptr is returned if no named data member exists. |
4000 | const FieldDecl *findFirstNamedDataMember() const; |
4001 | |
4002 | private: |
4003 | /// Deserialize just the fields. |
4004 | void LoadFieldsFromExternalStorage() const; |
4005 | }; |
4006 | |
4007 | class FileScopeAsmDecl : public Decl { |
4008 | StringLiteral *AsmString; |
4009 | SourceLocation RParenLoc; |
4010 | |
4011 | FileScopeAsmDecl(DeclContext *DC, StringLiteral *asmstring, |
4012 | SourceLocation StartL, SourceLocation EndL) |
4013 | : Decl(FileScopeAsm, DC, StartL), AsmString(asmstring), RParenLoc(EndL) {} |
4014 | |
4015 | virtual void anchor(); |
4016 | |
4017 | public: |
4018 | static FileScopeAsmDecl *Create(ASTContext &C, DeclContext *DC, |
4019 | StringLiteral *Str, SourceLocation AsmLoc, |
4020 | SourceLocation RParenLoc); |
4021 | |
4022 | static FileScopeAsmDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
4023 | |
4024 | SourceLocation getAsmLoc() const { return getLocation(); } |
4025 | SourceLocation getRParenLoc() const { return RParenLoc; } |
4026 | void setRParenLoc(SourceLocation L) { RParenLoc = L; } |
4027 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) { |
4028 | return SourceRange(getAsmLoc(), getRParenLoc()); |
4029 | } |
4030 | |
4031 | const StringLiteral *getAsmString() const { return AsmString; } |
4032 | StringLiteral *getAsmString() { return AsmString; } |
4033 | void setAsmString(StringLiteral *Asm) { AsmString = Asm; } |
4034 | |
4035 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
4036 | static bool classofKind(Kind K) { return K == FileScopeAsm; } |
4037 | }; |
4038 | |
4039 | /// Represents a block literal declaration, which is like an |
4040 | /// unnamed FunctionDecl. For example: |
4041 | /// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } |
4042 | class BlockDecl : public Decl, public DeclContext { |
4043 | // This class stores some data in DeclContext::BlockDeclBits |
4044 | // to save some space. Use the provided accessors to access it. |
4045 | public: |
4046 | /// A class which contains all the information about a particular |
4047 | /// captured value. |
4048 | class Capture { |
4049 | enum { |
4050 | flag_isByRef = 0x1, |
4051 | flag_isNested = 0x2 |
4052 | }; |
4053 | |
4054 | /// The variable being captured. |
4055 | llvm::PointerIntPair<VarDecl*, 2> VariableAndFlags; |
4056 | |
4057 | /// The copy expression, expressed in terms of a DeclRef (or |
4058 | /// BlockDeclRef) to the captured variable. Only required if the |
4059 | /// variable has a C++ class type. |
4060 | Expr *CopyExpr; |
4061 | |
4062 | public: |
4063 | Capture(VarDecl *variable, bool byRef, bool nested, Expr *copy) |
4064 | : VariableAndFlags(variable, |
4065 | (byRef ? flag_isByRef : 0) | (nested ? flag_isNested : 0)), |
4066 | CopyExpr(copy) {} |
4067 | |
4068 | /// The variable being captured. |
4069 | VarDecl *getVariable() const { return VariableAndFlags.getPointer(); } |
4070 | |
4071 | /// Whether this is a "by ref" capture, i.e. a capture of a __block |
4072 | /// variable. |
4073 | bool isByRef() const { return VariableAndFlags.getInt() & flag_isByRef; } |
4074 | |
4075 | bool isEscapingByref() const { |
4076 | return getVariable()->isEscapingByref(); |
4077 | } |
4078 | |
4079 | bool isNonEscapingByref() const { |
4080 | return getVariable()->isNonEscapingByref(); |
4081 | } |
4082 | |
4083 | /// Whether this is a nested capture, i.e. the variable captured |
4084 | /// is not from outside the immediately enclosing function/block. |
4085 | bool isNested() const { return VariableAndFlags.getInt() & flag_isNested; } |
4086 | |
4087 | bool hasCopyExpr() const { return CopyExpr != nullptr; } |
4088 | Expr *getCopyExpr() const { return CopyExpr; } |
4089 | void setCopyExpr(Expr *e) { CopyExpr = e; } |
4090 | }; |
4091 | |
4092 | private: |
4093 | /// A new[]'d array of pointers to ParmVarDecls for the formal |
4094 | /// parameters of this function. This is null if a prototype or if there are |
4095 | /// no formals. |
4096 | ParmVarDecl **ParamInfo = nullptr; |
4097 | unsigned NumParams = 0; |
4098 | |
4099 | Stmt *Body = nullptr; |
4100 | TypeSourceInfo *SignatureAsWritten = nullptr; |
4101 | |
4102 | const Capture *Captures = nullptr; |
4103 | unsigned NumCaptures = 0; |
4104 | |
4105 | unsigned ManglingNumber = 0; |
4106 | Decl *ManglingContextDecl = nullptr; |
4107 | |
4108 | protected: |
4109 | BlockDecl(DeclContext *DC, SourceLocation CaretLoc); |
4110 | |
4111 | public: |
4112 | static BlockDecl *Create(ASTContext &C, DeclContext *DC, SourceLocation L); |
4113 | static BlockDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
4114 | |
4115 | SourceLocation getCaretLocation() const { return getLocation(); } |
4116 | |
4117 | bool isVariadic() const { return BlockDeclBits.IsVariadic; } |
4118 | void setIsVariadic(bool value) { BlockDeclBits.IsVariadic = value; } |
4119 | |
4120 | CompoundStmt *getCompoundBody() const { return (CompoundStmt*) Body; } |
4121 | Stmt *getBody() const override { return (Stmt*) Body; } |
4122 | void setBody(CompoundStmt *B) { Body = (Stmt*) B; } |
4123 | |
4124 | void setSignatureAsWritten(TypeSourceInfo *Sig) { SignatureAsWritten = Sig; } |
4125 | TypeSourceInfo *getSignatureAsWritten() const { return SignatureAsWritten; } |
4126 | |
4127 | // ArrayRef access to formal parameters. |
4128 | ArrayRef<ParmVarDecl *> parameters() const { |
4129 | return {ParamInfo, getNumParams()}; |
4130 | } |
4131 | MutableArrayRef<ParmVarDecl *> parameters() { |
4132 | return {ParamInfo, getNumParams()}; |
4133 | } |
4134 | |
4135 | // Iterator access to formal parameters. |
4136 | using param_iterator = MutableArrayRef<ParmVarDecl *>::iterator; |
4137 | using param_const_iterator = ArrayRef<ParmVarDecl *>::const_iterator; |
4138 | |
4139 | bool param_empty() const { return parameters().empty(); } |
4140 | param_iterator param_begin() { return parameters().begin(); } |
4141 | param_iterator param_end() { return parameters().end(); } |
4142 | param_const_iterator param_begin() const { return parameters().begin(); } |
4143 | param_const_iterator param_end() const { return parameters().end(); } |
4144 | size_t param_size() const { return parameters().size(); } |
4145 | |
4146 | unsigned getNumParams() const { return NumParams; } |
4147 | |
4148 | const ParmVarDecl *getParamDecl(unsigned i) const { |
4149 | assert(i < getNumParams() && "Illegal param #")((i < getNumParams() && "Illegal param #") ? static_cast <void> (0) : __assert_fail ("i < getNumParams() && \"Illegal param #\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 4149, __PRETTY_FUNCTION__)); |
4150 | return ParamInfo[i]; |
4151 | } |
4152 | ParmVarDecl *getParamDecl(unsigned i) { |
4153 | assert(i < getNumParams() && "Illegal param #")((i < getNumParams() && "Illegal param #") ? static_cast <void> (0) : __assert_fail ("i < getNumParams() && \"Illegal param #\"" , "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 4153, __PRETTY_FUNCTION__)); |
4154 | return ParamInfo[i]; |
4155 | } |
4156 | |
4157 | void setParams(ArrayRef<ParmVarDecl *> NewParamInfo); |
4158 | |
4159 | /// True if this block (or its nested blocks) captures |
4160 | /// anything of local storage from its enclosing scopes. |
4161 | bool hasCaptures() const { return NumCaptures || capturesCXXThis(); } |
4162 | |
4163 | /// Returns the number of captured variables. |
4164 | /// Does not include an entry for 'this'. |
4165 | unsigned getNumCaptures() const { return NumCaptures; } |
4166 | |
4167 | using capture_const_iterator = ArrayRef<Capture>::const_iterator; |
4168 | |
4169 | ArrayRef<Capture> captures() const { return {Captures, NumCaptures}; } |
4170 | |
4171 | capture_const_iterator capture_begin() const { return captures().begin(); } |
4172 | capture_const_iterator capture_end() const { return captures().end(); } |
4173 | |
4174 | bool capturesCXXThis() const { return BlockDeclBits.CapturesCXXThis; } |
4175 | void setCapturesCXXThis(bool B = true) { BlockDeclBits.CapturesCXXThis = B; } |
4176 | |
4177 | bool blockMissingReturnType() const { |
4178 | return BlockDeclBits.BlockMissingReturnType; |
4179 | } |
4180 | |
4181 | void setBlockMissingReturnType(bool val = true) { |
4182 | BlockDeclBits.BlockMissingReturnType = val; |
4183 | } |
4184 | |
4185 | bool isConversionFromLambda() const { |
4186 | return BlockDeclBits.IsConversionFromLambda; |
4187 | } |
4188 | |
4189 | void setIsConversionFromLambda(bool val = true) { |
4190 | BlockDeclBits.IsConversionFromLambda = val; |
4191 | } |
4192 | |
4193 | bool doesNotEscape() const { return BlockDeclBits.DoesNotEscape; } |
4194 | void setDoesNotEscape(bool B = true) { BlockDeclBits.DoesNotEscape = B; } |
4195 | |
4196 | bool canAvoidCopyToHeap() const { |
4197 | return BlockDeclBits.CanAvoidCopyToHeap; |
4198 | } |
4199 | void setCanAvoidCopyToHeap(bool B = true) { |
4200 | BlockDeclBits.CanAvoidCopyToHeap = B; |
4201 | } |
4202 | |
4203 | bool capturesVariable(const VarDecl *var) const; |
4204 | |
4205 | void setCaptures(ASTContext &Context, ArrayRef<Capture> Captures, |
4206 | bool CapturesCXXThis); |
4207 | |
4208 | unsigned getBlockManglingNumber() const { return ManglingNumber; } |
4209 | |
4210 | Decl *getBlockManglingContextDecl() const { return ManglingContextDecl; } |
4211 | |
4212 | void setBlockMangling(unsigned Number, Decl *Ctx) { |
4213 | ManglingNumber = Number; |
4214 | ManglingContextDecl = Ctx; |
4215 | } |
4216 | |
4217 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
4218 | |
4219 | // Implement isa/cast/dyncast/etc. |
4220 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
4221 | static bool classofKind(Kind K) { return K == Block; } |
4222 | static DeclContext *castToDeclContext(const BlockDecl *D) { |
4223 | return static_cast<DeclContext *>(const_cast<BlockDecl*>(D)); |
4224 | } |
4225 | static BlockDecl *castFromDeclContext(const DeclContext *DC) { |
4226 | return static_cast<BlockDecl *>(const_cast<DeclContext*>(DC)); |
4227 | } |
4228 | }; |
4229 | |
4230 | /// Represents the body of a CapturedStmt, and serves as its DeclContext. |
4231 | class CapturedDecl final |
4232 | : public Decl, |
4233 | public DeclContext, |
4234 | private llvm::TrailingObjects<CapturedDecl, ImplicitParamDecl *> { |
4235 | protected: |
4236 | size_t numTrailingObjects(OverloadToken<ImplicitParamDecl>) { |
4237 | return NumParams; |
4238 | } |
4239 | |
4240 | private: |
4241 | /// The number of parameters to the outlined function. |
4242 | unsigned NumParams; |
4243 | |
4244 | /// The position of context parameter in list of parameters. |
4245 | unsigned ContextParam; |
4246 | |
4247 | /// The body of the outlined function. |
4248 | llvm::PointerIntPair<Stmt *, 1, bool> BodyAndNothrow; |
4249 | |
4250 | explicit CapturedDecl(DeclContext *DC, unsigned NumParams); |
4251 | |
4252 | ImplicitParamDecl *const *getParams() const { |
4253 | return getTrailingObjects<ImplicitParamDecl *>(); |
4254 | } |
4255 | |
4256 | ImplicitParamDecl **getParams() { |
4257 | return getTrailingObjects<ImplicitParamDecl *>(); |
4258 | } |
4259 | |
4260 | public: |
4261 | friend class ASTDeclReader; |
4262 | friend class ASTDeclWriter; |
4263 | friend TrailingObjects; |
4264 | |
4265 | static CapturedDecl *Create(ASTContext &C, DeclContext *DC, |
4266 | unsigned NumParams); |
4267 | static CapturedDecl *CreateDeserialized(ASTContext &C, unsigned ID, |
4268 | unsigned NumParams); |
4269 | |
4270 | Stmt *getBody() const override; |
4271 | void setBody(Stmt *B); |
4272 | |
4273 | bool isNothrow() const; |
4274 | void setNothrow(bool Nothrow = true); |
4275 | |
4276 | unsigned getNumParams() const { return NumParams; } |
4277 | |
4278 | ImplicitParamDecl *getParam(unsigned i) const { |
4279 | assert(i < NumParams)((i < NumParams) ? static_cast<void> (0) : __assert_fail ("i < NumParams", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 4279, __PRETTY_FUNCTION__)); |
4280 | return getParams()[i]; |
4281 | } |
4282 | void setParam(unsigned i, ImplicitParamDecl *P) { |
4283 | assert(i < NumParams)((i < NumParams) ? static_cast<void> (0) : __assert_fail ("i < NumParams", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 4283, __PRETTY_FUNCTION__)); |
4284 | getParams()[i] = P; |
4285 | } |
4286 | |
4287 | // ArrayRef interface to parameters. |
4288 | ArrayRef<ImplicitParamDecl *> parameters() const { |
4289 | return {getParams(), getNumParams()}; |
4290 | } |
4291 | MutableArrayRef<ImplicitParamDecl *> parameters() { |
4292 | return {getParams(), getNumParams()}; |
4293 | } |
4294 | |
4295 | /// Retrieve the parameter containing captured variables. |
4296 | ImplicitParamDecl *getContextParam() const { |
4297 | assert(ContextParam < NumParams)((ContextParam < NumParams) ? static_cast<void> (0) : __assert_fail ("ContextParam < NumParams", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 4297, __PRETTY_FUNCTION__)); |
4298 | return getParam(ContextParam); |
4299 | } |
4300 | void setContextParam(unsigned i, ImplicitParamDecl *P) { |
4301 | assert(i < NumParams)((i < NumParams) ? static_cast<void> (0) : __assert_fail ("i < NumParams", "/build/llvm-toolchain-snapshot-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 4301, __PRETTY_FUNCTION__)); |
4302 | ContextParam = i; |
4303 | setParam(i, P); |
4304 | } |
4305 | unsigned getContextParamPosition() const { return ContextParam; } |
4306 | |
4307 | using param_iterator = ImplicitParamDecl *const *; |
4308 | using param_range = llvm::iterator_range<param_iterator>; |
4309 | |
4310 | /// Retrieve an iterator pointing to the first parameter decl. |
4311 | param_iterator param_begin() const { return getParams(); } |
4312 | /// Retrieve an iterator one past the last parameter decl. |
4313 | param_iterator param_end() const { return getParams() + NumParams; } |
4314 | |
4315 | // Implement isa/cast/dyncast/etc. |
4316 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
4317 | static bool classofKind(Kind K) { return K == Captured; } |
4318 | static DeclContext *castToDeclContext(const CapturedDecl *D) { |
4319 | return static_cast<DeclContext *>(const_cast<CapturedDecl *>(D)); |
4320 | } |
4321 | static CapturedDecl *castFromDeclContext(const DeclContext *DC) { |
4322 | return static_cast<CapturedDecl *>(const_cast<DeclContext *>(DC)); |
4323 | } |
4324 | }; |
4325 | |
4326 | /// Describes a module import declaration, which makes the contents |
4327 | /// of the named module visible in the current translation unit. |
4328 | /// |
4329 | /// An import declaration imports the named module (or submodule). For example: |
4330 | /// \code |
4331 | /// @import std.vector; |
4332 | /// \endcode |
4333 | /// |
4334 | /// Import declarations can also be implicitly generated from |
4335 | /// \#include/\#import directives. |
4336 | class ImportDecl final : public Decl, |
4337 | llvm::TrailingObjects<ImportDecl, SourceLocation> { |
4338 | friend class ASTContext; |
4339 | friend class ASTDeclReader; |
4340 | friend class ASTReader; |
4341 | friend TrailingObjects; |
4342 | |
4343 | /// The imported module, along with a bit that indicates whether |
4344 | /// we have source-location information for each identifier in the module |
4345 | /// name. |
4346 | /// |
4347 | /// When the bit is false, we only have a single source location for the |
4348 | /// end of the import declaration. |
4349 | llvm::PointerIntPair<Module *, 1, bool> ImportedAndComplete; |
4350 | |
4351 | /// The next import in the list of imports local to the translation |
4352 | /// unit being parsed (not loaded from an AST file). |
4353 | ImportDecl *NextLocalImport = nullptr; |
4354 | |
4355 | ImportDecl(DeclContext *DC, SourceLocation StartLoc, Module *Imported, |
4356 | ArrayRef<SourceLocation> IdentifierLocs); |
4357 | |
4358 | ImportDecl(DeclContext *DC, SourceLocation StartLoc, Module *Imported, |
4359 | SourceLocation EndLoc); |
4360 | |
4361 | ImportDecl(EmptyShell Empty) : Decl(Import, Empty) {} |
4362 | |
4363 | public: |
4364 | /// Create a new module import declaration. |
4365 | static ImportDecl *Create(ASTContext &C, DeclContext *DC, |
4366 | SourceLocation StartLoc, Module *Imported, |
4367 | ArrayRef<SourceLocation> IdentifierLocs); |
4368 | |
4369 | /// Create a new module import declaration for an implicitly-generated |
4370 | /// import. |
4371 | static ImportDecl *CreateImplicit(ASTContext &C, DeclContext *DC, |
4372 | SourceLocation StartLoc, Module *Imported, |
4373 | SourceLocation EndLoc); |
4374 | |
4375 | /// Create a new, deserialized module import declaration. |
4376 | static ImportDecl *CreateDeserialized(ASTContext &C, unsigned ID, |
4377 | unsigned NumLocations); |
4378 | |
4379 | /// Retrieve the module that was imported by the import declaration. |
4380 | Module *getImportedModule() const { return ImportedAndComplete.getPointer(); } |
4381 | |
4382 | /// Retrieves the locations of each of the identifiers that make up |
4383 | /// the complete module name in the import declaration. |
4384 | /// |
4385 | /// This will return an empty array if the locations of the individual |
4386 | /// identifiers aren't available. |
4387 | ArrayRef<SourceLocation> getIdentifierLocs() const; |
4388 | |
4389 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); |
4390 | |
4391 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
4392 | static bool classofKind(Kind K) { return K == Import; } |
4393 | }; |
4394 | |
4395 | /// Represents a C++ Modules TS module export declaration. |
4396 | /// |
4397 | /// For example: |
4398 | /// \code |
4399 | /// export void foo(); |
4400 | /// \endcode |
4401 | class ExportDecl final : public Decl, public DeclContext { |
4402 | virtual void anchor(); |
4403 | |
4404 | private: |
4405 | friend class ASTDeclReader; |
4406 | |
4407 | /// The source location for the right brace (if valid). |
4408 | SourceLocation RBraceLoc; |
4409 | |
4410 | ExportDecl(DeclContext *DC, SourceLocation ExportLoc) |
4411 | : Decl(Export, DC, ExportLoc), DeclContext(Export), |
4412 | RBraceLoc(SourceLocation()) {} |
4413 | |
4414 | public: |
4415 | static ExportDecl *Create(ASTContext &C, DeclContext *DC, |
4416 | SourceLocation ExportLoc); |
4417 | static ExportDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
4418 | |
4419 | SourceLocation getExportLoc() const { return getLocation(); } |
4420 | SourceLocation getRBraceLoc() const { return RBraceLoc; } |
4421 | void setRBraceLoc(SourceLocation L) { RBraceLoc = L; } |
4422 | |
4423 | bool hasBraces() const { return RBraceLoc.isValid(); } |
4424 | |
4425 | SourceLocation getEndLoc() const LLVM_READONLY__attribute__((__pure__)) { |
4426 | if (hasBraces()) |
4427 | return RBraceLoc; |
4428 | // No braces: get the end location of the (only) declaration in context |
4429 | // (if present). |
4430 | return decls_empty() ? getLocation() : decls_begin()->getEndLoc(); |
4431 | } |
4432 | |
4433 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) { |
4434 | return SourceRange(getLocation(), getEndLoc()); |
4435 | } |
4436 | |
4437 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
4438 | static bool classofKind(Kind K) { return K == Export; } |
4439 | static DeclContext *castToDeclContext(const ExportDecl *D) { |
4440 | return static_cast<DeclContext *>(const_cast<ExportDecl*>(D)); |
4441 | } |
4442 | static ExportDecl *castFromDeclContext(const DeclContext *DC) { |
4443 | return static_cast<ExportDecl *>(const_cast<DeclContext*>(DC)); |
4444 | } |
4445 | }; |
4446 | |
4447 | /// Represents an empty-declaration. |
4448 | class EmptyDecl : public Decl { |
4449 | EmptyDecl(DeclContext *DC, SourceLocation L) : Decl(Empty, DC, L) {} |
4450 | |
4451 | virtual void anchor(); |
4452 | |
4453 | public: |
4454 | static EmptyDecl *Create(ASTContext &C, DeclContext *DC, |
4455 | SourceLocation L); |
4456 | static EmptyDecl *CreateDeserialized(ASTContext &C, unsigned ID); |
4457 | |
4458 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } |
4459 | static bool classofKind(Kind K) { return K == Empty; } |
4460 | }; |
4461 | |
4462 | /// Insertion operator for diagnostics. This allows sending NamedDecl's |
4463 | /// into a diagnostic with <<. |
4464 | inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB, |
4465 | const NamedDecl* ND) { |
4466 | DB.AddTaggedVal(reinterpret_cast<intptr_t>(ND), |
4467 | DiagnosticsEngine::ak_nameddecl); |
4468 | return DB; |
4469 | } |
4470 | inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD, |
4471 | const NamedDecl* ND) { |
4472 | PD.AddTaggedVal(reinterpret_cast<intptr_t>(ND), |
4473 | DiagnosticsEngine::ak_nameddecl); |
4474 | return PD; |
4475 | } |
4476 | |
4477 | template<typename decl_type> |
4478 | void Redeclarable<decl_type>::setPreviousDecl(decl_type *PrevDecl) { |
4479 | // Note: This routine is implemented here because we need both NamedDecl |
4480 | // and Redeclarable to be defined. |
4481 | 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-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 4482, __PRETTY_FUNCTION__)) |
4482 | "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-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 4482, __PRETTY_FUNCTION__)); |
4483 | |
4484 | if (PrevDecl) { |
4485 | // Point to previous. Make sure that this is actually the most recent |
4486 | // redeclaration, or we can build invalid chains. If the most recent |
4487 | // redeclaration is invalid, it won't be PrevDecl, but we want it anyway. |
4488 | First = PrevDecl->getFirstDecl(); |
4489 | 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-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 4489, __PRETTY_FUNCTION__)); |
4490 | decl_type *MostRecent = First->getNextRedeclaration(); |
4491 | RedeclLink = PreviousDeclLink(cast<decl_type>(MostRecent)); |
4492 | |
4493 | // If the declaration was previously visible, a redeclaration of it remains |
4494 | // visible even if it wouldn't be visible by itself. |
4495 | static_cast<decl_type*>(this)->IdentifierNamespace |= |
4496 | MostRecent->getIdentifierNamespace() & |
4497 | (Decl::IDNS_Ordinary | Decl::IDNS_Tag | Decl::IDNS_Type); |
4498 | } else { |
4499 | // Make this first. |
4500 | First = static_cast<decl_type*>(this); |
4501 | } |
4502 | |
4503 | // First one will point to this one as latest. |
4504 | First->RedeclLink.setLatest(static_cast<decl_type*>(this)); |
4505 | |
4506 | 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-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 4507, __PRETTY_FUNCTION__)) |
4507 | 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-11~++20200309111110+2c36c23f347/clang/include/clang/AST/Decl.h" , 4507, __PRETTY_FUNCTION__)); |
4508 | } |
4509 | |
4510 | // Inline function definitions. |
4511 | |
4512 | /// Check if the given decl is complete. |
4513 | /// |
4514 | /// We use this function to break a cycle between the inline definitions in |
4515 | /// Type.h and Decl.h. |
4516 | inline bool IsEnumDeclComplete(EnumDecl *ED) { |
4517 | return ED->isComplete(); |
4518 | } |
4519 | |
4520 | /// Check if the given decl is scoped. |
4521 | /// |
4522 | /// We use this function to break a cycle between the inline definitions in |
4523 | /// Type.h and Decl.h. |
4524 | inline bool IsEnumDeclScoped(EnumDecl *ED) { |
4525 | return ED->isScoped(); |
4526 | } |
4527 | |
4528 | } // namespace clang |
4529 | |
4530 | #endif // LLVM_CLANG_AST_DECL_H |