File: | tools/clang/lib/Sema/SemaDeclCXX.cpp |
Warning: | line 10816, column 5 Passed-by-value struct argument contains uninitialized data (e.g., field: 'SavedInNonInstantiationSFINAEContext') |
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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/PartialDiagnostic.h" |
28 | #include "clang/Basic/TargetInfo.h" |
29 | #include "clang/Lex/LiteralSupport.h" |
30 | #include "clang/Lex/Preprocessor.h" |
31 | #include "clang/Sema/CXXFieldCollector.h" |
32 | #include "clang/Sema/DeclSpec.h" |
33 | #include "clang/Sema/Initialization.h" |
34 | #include "clang/Sema/Lookup.h" |
35 | #include "clang/Sema/ParsedTemplate.h" |
36 | #include "clang/Sema/Scope.h" |
37 | #include "clang/Sema/ScopeInfo.h" |
38 | #include "clang/Sema/SemaInternal.h" |
39 | #include "clang/Sema/Template.h" |
40 | #include "llvm/ADT/STLExtras.h" |
41 | #include "llvm/ADT/SmallString.h" |
42 | #include "llvm/ADT/StringExtras.h" |
43 | #include <map> |
44 | #include <set> |
45 | |
46 | using namespace clang; |
47 | |
48 | //===----------------------------------------------------------------------===// |
49 | // CheckDefaultArgumentVisitor |
50 | //===----------------------------------------------------------------------===// |
51 | |
52 | namespace { |
53 | /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses |
54 | /// the default argument of a parameter to determine whether it |
55 | /// contains any ill-formed subexpressions. For example, this will |
56 | /// diagnose the use of local variables or parameters within the |
57 | /// default argument expression. |
58 | class CheckDefaultArgumentVisitor |
59 | : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { |
60 | Expr *DefaultArg; |
61 | Sema *S; |
62 | |
63 | public: |
64 | CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) |
65 | : DefaultArg(defarg), S(s) {} |
66 | |
67 | bool VisitExpr(Expr *Node); |
68 | bool VisitDeclRefExpr(DeclRefExpr *DRE); |
69 | bool VisitCXXThisExpr(CXXThisExpr *ThisE); |
70 | bool VisitLambdaExpr(LambdaExpr *Lambda); |
71 | bool VisitPseudoObjectExpr(PseudoObjectExpr *POE); |
72 | }; |
73 | |
74 | /// VisitExpr - Visit all of the children of this expression. |
75 | bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { |
76 | bool IsInvalid = false; |
77 | for (Stmt *SubStmt : Node->children()) |
78 | IsInvalid |= Visit(SubStmt); |
79 | return IsInvalid; |
80 | } |
81 | |
82 | /// VisitDeclRefExpr - Visit a reference to a declaration, to |
83 | /// determine whether this declaration can be used in the default |
84 | /// argument expression. |
85 | bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { |
86 | NamedDecl *Decl = DRE->getDecl(); |
87 | if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { |
88 | // C++ [dcl.fct.default]p9 |
89 | // Default arguments are evaluated each time the function is |
90 | // called. The order of evaluation of function arguments is |
91 | // unspecified. Consequently, parameters of a function shall not |
92 | // be used in default argument expressions, even if they are not |
93 | // evaluated. Parameters of a function declared before a default |
94 | // argument expression are in scope and can hide namespace and |
95 | // class member names. |
96 | return S->Diag(DRE->getBeginLoc(), |
97 | diag::err_param_default_argument_references_param) |
98 | << Param->getDeclName() << DefaultArg->getSourceRange(); |
99 | } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { |
100 | // C++ [dcl.fct.default]p7 |
101 | // Local variables shall not be used in default argument |
102 | // expressions. |
103 | if (VDecl->isLocalVarDecl()) |
104 | return S->Diag(DRE->getBeginLoc(), |
105 | diag::err_param_default_argument_references_local) |
106 | << VDecl->getDeclName() << DefaultArg->getSourceRange(); |
107 | } |
108 | |
109 | return false; |
110 | } |
111 | |
112 | /// VisitCXXThisExpr - Visit a C++ "this" expression. |
113 | bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { |
114 | // C++ [dcl.fct.default]p8: |
115 | // The keyword this shall not be used in a default argument of a |
116 | // member function. |
117 | return S->Diag(ThisE->getBeginLoc(), |
118 | diag::err_param_default_argument_references_this) |
119 | << ThisE->getSourceRange(); |
120 | } |
121 | |
122 | bool CheckDefaultArgumentVisitor::VisitPseudoObjectExpr(PseudoObjectExpr *POE) { |
123 | bool Invalid = false; |
124 | for (PseudoObjectExpr::semantics_iterator |
125 | i = POE->semantics_begin(), e = POE->semantics_end(); i != e; ++i) { |
126 | Expr *E = *i; |
127 | |
128 | // Look through bindings. |
129 | if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) { |
130 | E = OVE->getSourceExpr(); |
131 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 131, __PRETTY_FUNCTION__)); |
132 | } |
133 | |
134 | Invalid |= Visit(E); |
135 | } |
136 | return Invalid; |
137 | } |
138 | |
139 | bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { |
140 | // C++11 [expr.lambda.prim]p13: |
141 | // A lambda-expression appearing in a default argument shall not |
142 | // implicitly or explicitly capture any entity. |
143 | if (Lambda->capture_begin() == Lambda->capture_end()) |
144 | return false; |
145 | |
146 | return S->Diag(Lambda->getBeginLoc(), diag::err_lambda_capture_default_arg); |
147 | } |
148 | } |
149 | |
150 | void |
151 | Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, |
152 | const CXXMethodDecl *Method) { |
153 | // If we have an MSAny spec already, don't bother. |
154 | if (!Method || ComputedEST == EST_MSAny) |
155 | return; |
156 | |
157 | const FunctionProtoType *Proto |
158 | = Method->getType()->getAs<FunctionProtoType>(); |
159 | Proto = Self->ResolveExceptionSpec(CallLoc, Proto); |
160 | if (!Proto) |
161 | return; |
162 | |
163 | ExceptionSpecificationType EST = Proto->getExceptionSpecType(); |
164 | |
165 | // If we have a throw-all spec at this point, ignore the function. |
166 | if (ComputedEST == EST_None) |
167 | return; |
168 | |
169 | if (EST == EST_None && Method->hasAttr<NoThrowAttr>()) |
170 | EST = EST_BasicNoexcept; |
171 | |
172 | switch (EST) { |
173 | case EST_Unparsed: |
174 | case EST_Uninstantiated: |
175 | case EST_Unevaluated: |
176 | llvm_unreachable("should not see unresolved exception specs here")::llvm::llvm_unreachable_internal("should not see unresolved exception specs here" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 176); |
177 | |
178 | // If this function can throw any exceptions, make a note of that. |
179 | case EST_MSAny: |
180 | case EST_None: |
181 | // FIXME: Whichever we see last of MSAny and None determines our result. |
182 | // We should make a consistent, order-independent choice here. |
183 | ClearExceptions(); |
184 | ComputedEST = EST; |
185 | return; |
186 | case EST_NoexceptFalse: |
187 | ClearExceptions(); |
188 | ComputedEST = EST_None; |
189 | return; |
190 | // FIXME: If the call to this decl is using any of its default arguments, we |
191 | // need to search them for potentially-throwing calls. |
192 | // If this function has a basic noexcept, it doesn't affect the outcome. |
193 | case EST_BasicNoexcept: |
194 | case EST_NoexceptTrue: |
195 | return; |
196 | // If we're still at noexcept(true) and there's a throw() callee, |
197 | // change to that specification. |
198 | case EST_DynamicNone: |
199 | if (ComputedEST == EST_BasicNoexcept) |
200 | ComputedEST = EST_DynamicNone; |
201 | return; |
202 | case EST_DependentNoexcept: |
203 | llvm_unreachable(::llvm::llvm_unreachable_internal("should not generate implicit declarations for dependent cases" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 204) |
204 | "should not generate implicit declarations for dependent cases")::llvm::llvm_unreachable_internal("should not generate implicit declarations for dependent cases" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 204); |
205 | case EST_Dynamic: |
206 | break; |
207 | } |
208 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 208, __PRETTY_FUNCTION__)); |
209 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 210, __PRETTY_FUNCTION__)) |
210 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 210, __PRETTY_FUNCTION__)); |
211 | ComputedEST = EST_Dynamic; |
212 | // Record the exceptions in this function's exception specification. |
213 | for (const auto &E : Proto->exceptions()) |
214 | if (ExceptionsSeen.insert(Self->Context.getCanonicalType(E)).second) |
215 | Exceptions.push_back(E); |
216 | } |
217 | |
218 | void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { |
219 | if (!E || ComputedEST == EST_MSAny) |
220 | return; |
221 | |
222 | // FIXME: |
223 | // |
224 | // C++0x [except.spec]p14: |
225 | // [An] implicit exception-specification specifies the type-id T if and |
226 | // only if T is allowed by the exception-specification of a function directly |
227 | // invoked by f's implicit definition; f shall allow all exceptions if any |
228 | // function it directly invokes allows all exceptions, and f shall allow no |
229 | // exceptions if every function it directly invokes allows no exceptions. |
230 | // |
231 | // Note in particular that if an implicit exception-specification is generated |
232 | // for a function containing a throw-expression, that specification can still |
233 | // be noexcept(true). |
234 | // |
235 | // Note also that 'directly invoked' is not defined in the standard, and there |
236 | // is no indication that we should only consider potentially-evaluated calls. |
237 | // |
238 | // Ultimately we should implement the intent of the standard: the exception |
239 | // specification should be the set of exceptions which can be thrown by the |
240 | // implicit definition. For now, we assume that any non-nothrow expression can |
241 | // throw any exception. |
242 | |
243 | if (Self->canThrow(E)) |
244 | ComputedEST = EST_None; |
245 | } |
246 | |
247 | bool |
248 | Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, |
249 | SourceLocation EqualLoc) { |
250 | if (RequireCompleteType(Param->getLocation(), Param->getType(), |
251 | diag::err_typecheck_decl_incomplete_type)) { |
252 | Param->setInvalidDecl(); |
253 | return true; |
254 | } |
255 | |
256 | // C++ [dcl.fct.default]p5 |
257 | // A default argument expression is implicitly converted (clause |
258 | // 4) to the parameter type. The default argument expression has |
259 | // the same semantic constraints as the initializer expression in |
260 | // a declaration of a variable of the parameter type, using the |
261 | // copy-initialization semantics (8.5). |
262 | InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, |
263 | Param); |
264 | InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), |
265 | EqualLoc); |
266 | InitializationSequence InitSeq(*this, Entity, Kind, Arg); |
267 | ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); |
268 | if (Result.isInvalid()) |
269 | return true; |
270 | Arg = Result.getAs<Expr>(); |
271 | |
272 | CheckCompletedExpr(Arg, EqualLoc); |
273 | Arg = MaybeCreateExprWithCleanups(Arg); |
274 | |
275 | // Okay: add the default argument to the parameter |
276 | Param->setDefaultArg(Arg); |
277 | |
278 | // We have already instantiated this parameter; provide each of the |
279 | // instantiations with the uninstantiated default argument. |
280 | UnparsedDefaultArgInstantiationsMap::iterator InstPos |
281 | = UnparsedDefaultArgInstantiations.find(Param); |
282 | if (InstPos != UnparsedDefaultArgInstantiations.end()) { |
283 | for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) |
284 | InstPos->second[I]->setUninstantiatedDefaultArg(Arg); |
285 | |
286 | // We're done tracking this parameter's instantiations. |
287 | UnparsedDefaultArgInstantiations.erase(InstPos); |
288 | } |
289 | |
290 | return false; |
291 | } |
292 | |
293 | /// ActOnParamDefaultArgument - Check whether the default argument |
294 | /// provided for a function parameter is well-formed. If so, attach it |
295 | /// to the parameter declaration. |
296 | void |
297 | Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, |
298 | Expr *DefaultArg) { |
299 | if (!param || !DefaultArg) |
300 | return; |
301 | |
302 | ParmVarDecl *Param = cast<ParmVarDecl>(param); |
303 | UnparsedDefaultArgLocs.erase(Param); |
304 | |
305 | // Default arguments are only permitted in C++ |
306 | if (!getLangOpts().CPlusPlus) { |
307 | Diag(EqualLoc, diag::err_param_default_argument) |
308 | << DefaultArg->getSourceRange(); |
309 | Param->setInvalidDecl(); |
310 | return; |
311 | } |
312 | |
313 | // Check for unexpanded parameter packs. |
314 | if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { |
315 | Param->setInvalidDecl(); |
316 | return; |
317 | } |
318 | |
319 | // C++11 [dcl.fct.default]p3 |
320 | // A default argument expression [...] shall not be specified for a |
321 | // parameter pack. |
322 | if (Param->isParameterPack()) { |
323 | Diag(EqualLoc, diag::err_param_default_argument_on_parameter_pack) |
324 | << DefaultArg->getSourceRange(); |
325 | return; |
326 | } |
327 | |
328 | // Check that the default argument is well-formed |
329 | CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); |
330 | if (DefaultArgChecker.Visit(DefaultArg)) { |
331 | Param->setInvalidDecl(); |
332 | return; |
333 | } |
334 | |
335 | SetParamDefaultArgument(Param, DefaultArg, EqualLoc); |
336 | } |
337 | |
338 | /// ActOnParamUnparsedDefaultArgument - We've seen a default |
339 | /// argument for a function parameter, but we can't parse it yet |
340 | /// because we're inside a class definition. Note that this default |
341 | /// argument will be parsed later. |
342 | void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, |
343 | SourceLocation EqualLoc, |
344 | SourceLocation ArgLoc) { |
345 | if (!param) |
346 | return; |
347 | |
348 | ParmVarDecl *Param = cast<ParmVarDecl>(param); |
349 | Param->setUnparsedDefaultArg(); |
350 | UnparsedDefaultArgLocs[Param] = ArgLoc; |
351 | } |
352 | |
353 | /// ActOnParamDefaultArgumentError - Parsing or semantic analysis of |
354 | /// the default argument for the parameter param failed. |
355 | void Sema::ActOnParamDefaultArgumentError(Decl *param, |
356 | SourceLocation EqualLoc) { |
357 | if (!param) |
358 | return; |
359 | |
360 | ParmVarDecl *Param = cast<ParmVarDecl>(param); |
361 | Param->setInvalidDecl(); |
362 | UnparsedDefaultArgLocs.erase(Param); |
363 | Param->setDefaultArg(new(Context) |
364 | OpaqueValueExpr(EqualLoc, |
365 | Param->getType().getNonReferenceType(), |
366 | VK_RValue)); |
367 | } |
368 | |
369 | /// CheckExtraCXXDefaultArguments - Check for any extra default |
370 | /// arguments in the declarator, which is not a function declaration |
371 | /// or definition and therefore is not permitted to have default |
372 | /// arguments. This routine should be invoked for every declarator |
373 | /// that is not a function declaration or definition. |
374 | void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { |
375 | // C++ [dcl.fct.default]p3 |
376 | // A default argument expression shall be specified only in the |
377 | // parameter-declaration-clause of a function declaration or in a |
378 | // template-parameter (14.1). It shall not be specified for a |
379 | // parameter pack. If it is specified in a |
380 | // parameter-declaration-clause, it shall not occur within a |
381 | // declarator or abstract-declarator of a parameter-declaration. |
382 | bool MightBeFunction = D.isFunctionDeclarationContext(); |
383 | for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { |
384 | DeclaratorChunk &chunk = D.getTypeObject(i); |
385 | if (chunk.Kind == DeclaratorChunk::Function) { |
386 | if (MightBeFunction) { |
387 | // This is a function declaration. It can have default arguments, but |
388 | // keep looking in case its return type is a function type with default |
389 | // arguments. |
390 | MightBeFunction = false; |
391 | continue; |
392 | } |
393 | for (unsigned argIdx = 0, e = chunk.Fun.NumParams; argIdx != e; |
394 | ++argIdx) { |
395 | ParmVarDecl *Param = cast<ParmVarDecl>(chunk.Fun.Params[argIdx].Param); |
396 | if (Param->hasUnparsedDefaultArg()) { |
397 | std::unique_ptr<CachedTokens> Toks = |
398 | std::move(chunk.Fun.Params[argIdx].DefaultArgTokens); |
399 | SourceRange SR; |
400 | if (Toks->size() > 1) |
401 | SR = SourceRange((*Toks)[1].getLocation(), |
402 | Toks->back().getLocation()); |
403 | else |
404 | SR = UnparsedDefaultArgLocs[Param]; |
405 | Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) |
406 | << SR; |
407 | } else if (Param->getDefaultArg()) { |
408 | Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) |
409 | << Param->getDefaultArg()->getSourceRange(); |
410 | Param->setDefaultArg(nullptr); |
411 | } |
412 | } |
413 | } else if (chunk.Kind != DeclaratorChunk::Paren) { |
414 | MightBeFunction = false; |
415 | } |
416 | } |
417 | } |
418 | |
419 | static bool functionDeclHasDefaultArgument(const FunctionDecl *FD) { |
420 | for (unsigned NumParams = FD->getNumParams(); NumParams > 0; --NumParams) { |
421 | const ParmVarDecl *PVD = FD->getParamDecl(NumParams-1); |
422 | if (!PVD->hasDefaultArg()) |
423 | return false; |
424 | if (!PVD->hasInheritedDefaultArg()) |
425 | return true; |
426 | } |
427 | return false; |
428 | } |
429 | |
430 | /// MergeCXXFunctionDecl - Merge two declarations of the same C++ |
431 | /// function, once we already know that they have the same |
432 | /// type. Subroutine of MergeFunctionDecl. Returns true if there was an |
433 | /// error, false otherwise. |
434 | bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, |
435 | Scope *S) { |
436 | bool Invalid = false; |
437 | |
438 | // The declaration context corresponding to the scope is the semantic |
439 | // parent, unless this is a local function declaration, in which case |
440 | // it is that surrounding function. |
441 | DeclContext *ScopeDC = New->isLocalExternDecl() |
442 | ? New->getLexicalDeclContext() |
443 | : New->getDeclContext(); |
444 | |
445 | // Find the previous declaration for the purpose of default arguments. |
446 | FunctionDecl *PrevForDefaultArgs = Old; |
447 | for (/**/; PrevForDefaultArgs; |
448 | // Don't bother looking back past the latest decl if this is a local |
449 | // extern declaration; nothing else could work. |
450 | PrevForDefaultArgs = New->isLocalExternDecl() |
451 | ? nullptr |
452 | : PrevForDefaultArgs->getPreviousDecl()) { |
453 | // Ignore hidden declarations. |
454 | if (!LookupResult::isVisible(*this, PrevForDefaultArgs)) |
455 | continue; |
456 | |
457 | if (S && !isDeclInScope(PrevForDefaultArgs, ScopeDC, S) && |
458 | !New->isCXXClassMember()) { |
459 | // Ignore default arguments of old decl if they are not in |
460 | // the same scope and this is not an out-of-line definition of |
461 | // a member function. |
462 | continue; |
463 | } |
464 | |
465 | if (PrevForDefaultArgs->isLocalExternDecl() != New->isLocalExternDecl()) { |
466 | // If only one of these is a local function declaration, then they are |
467 | // declared in different scopes, even though isDeclInScope may think |
468 | // they're in the same scope. (If both are local, the scope check is |
469 | // sufficient, and if neither is local, then they are in the same scope.) |
470 | continue; |
471 | } |
472 | |
473 | // We found the right previous declaration. |
474 | break; |
475 | } |
476 | |
477 | // C++ [dcl.fct.default]p4: |
478 | // For non-template functions, default arguments can be added in |
479 | // later declarations of a function in the same |
480 | // scope. Declarations in different scopes have completely |
481 | // distinct sets of default arguments. That is, declarations in |
482 | // inner scopes do not acquire default arguments from |
483 | // declarations in outer scopes, and vice versa. In a given |
484 | // function declaration, all parameters subsequent to a |
485 | // parameter with a default argument shall have default |
486 | // arguments supplied in this or previous declarations. A |
487 | // default argument shall not be redefined by a later |
488 | // declaration (not even to the same value). |
489 | // |
490 | // C++ [dcl.fct.default]p6: |
491 | // Except for member functions of class templates, the default arguments |
492 | // in a member function definition that appears outside of the class |
493 | // definition are added to the set of default arguments provided by the |
494 | // member function declaration in the class definition. |
495 | for (unsigned p = 0, NumParams = PrevForDefaultArgs |
496 | ? PrevForDefaultArgs->getNumParams() |
497 | : 0; |
498 | p < NumParams; ++p) { |
499 | ParmVarDecl *OldParam = PrevForDefaultArgs->getParamDecl(p); |
500 | ParmVarDecl *NewParam = New->getParamDecl(p); |
501 | |
502 | bool OldParamHasDfl = OldParam ? OldParam->hasDefaultArg() : false; |
503 | bool NewParamHasDfl = NewParam->hasDefaultArg(); |
504 | |
505 | if (OldParamHasDfl && NewParamHasDfl) { |
506 | unsigned DiagDefaultParamID = |
507 | diag::err_param_default_argument_redefinition; |
508 | |
509 | // MSVC accepts that default parameters be redefined for member functions |
510 | // of template class. The new default parameter's value is ignored. |
511 | Invalid = true; |
512 | if (getLangOpts().MicrosoftExt) { |
513 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(New); |
514 | if (MD && MD->getParent()->getDescribedClassTemplate()) { |
515 | // Merge the old default argument into the new parameter. |
516 | NewParam->setHasInheritedDefaultArg(); |
517 | if (OldParam->hasUninstantiatedDefaultArg()) |
518 | NewParam->setUninstantiatedDefaultArg( |
519 | OldParam->getUninstantiatedDefaultArg()); |
520 | else |
521 | NewParam->setDefaultArg(OldParam->getInit()); |
522 | DiagDefaultParamID = diag::ext_param_default_argument_redefinition; |
523 | Invalid = false; |
524 | } |
525 | } |
526 | |
527 | // FIXME: If we knew where the '=' was, we could easily provide a fix-it |
528 | // hint here. Alternatively, we could walk the type-source information |
529 | // for NewParam to find the last source location in the type... but it |
530 | // isn't worth the effort right now. This is the kind of test case that |
531 | // is hard to get right: |
532 | // int f(int); |
533 | // void g(int (*fp)(int) = f); |
534 | // void g(int (*fp)(int) = &f); |
535 | Diag(NewParam->getLocation(), DiagDefaultParamID) |
536 | << NewParam->getDefaultArgRange(); |
537 | |
538 | // Look for the function declaration where the default argument was |
539 | // actually written, which may be a declaration prior to Old. |
540 | for (auto Older = PrevForDefaultArgs; |
541 | OldParam->hasInheritedDefaultArg(); /**/) { |
542 | Older = Older->getPreviousDecl(); |
543 | OldParam = Older->getParamDecl(p); |
544 | } |
545 | |
546 | Diag(OldParam->getLocation(), diag::note_previous_definition) |
547 | << OldParam->getDefaultArgRange(); |
548 | } else if (OldParamHasDfl) { |
549 | // Merge the old default argument into the new parameter unless the new |
550 | // function is a friend declaration in a template class. In the latter |
551 | // case the default arguments will be inherited when the friend |
552 | // declaration will be instantiated. |
553 | if (New->getFriendObjectKind() == Decl::FOK_None || |
554 | !New->getLexicalDeclContext()->isDependentContext()) { |
555 | // It's important to use getInit() here; getDefaultArg() |
556 | // strips off any top-level ExprWithCleanups. |
557 | NewParam->setHasInheritedDefaultArg(); |
558 | if (OldParam->hasUnparsedDefaultArg()) |
559 | NewParam->setUnparsedDefaultArg(); |
560 | else if (OldParam->hasUninstantiatedDefaultArg()) |
561 | NewParam->setUninstantiatedDefaultArg( |
562 | OldParam->getUninstantiatedDefaultArg()); |
563 | else |
564 | NewParam->setDefaultArg(OldParam->getInit()); |
565 | } |
566 | } else if (NewParamHasDfl) { |
567 | if (New->getDescribedFunctionTemplate()) { |
568 | // Paragraph 4, quoted above, only applies to non-template functions. |
569 | Diag(NewParam->getLocation(), |
570 | diag::err_param_default_argument_template_redecl) |
571 | << NewParam->getDefaultArgRange(); |
572 | Diag(PrevForDefaultArgs->getLocation(), |
573 | diag::note_template_prev_declaration) |
574 | << false; |
575 | } else if (New->getTemplateSpecializationKind() |
576 | != TSK_ImplicitInstantiation && |
577 | New->getTemplateSpecializationKind() != TSK_Undeclared) { |
578 | // C++ [temp.expr.spec]p21: |
579 | // Default function arguments shall not be specified in a declaration |
580 | // or a definition for one of the following explicit specializations: |
581 | // - the explicit specialization of a function template; |
582 | // - the explicit specialization of a member function template; |
583 | // - the explicit specialization of a member function of a class |
584 | // template where the class template specialization to which the |
585 | // member function specialization belongs is implicitly |
586 | // instantiated. |
587 | Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) |
588 | << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) |
589 | << New->getDeclName() |
590 | << NewParam->getDefaultArgRange(); |
591 | } else if (New->getDeclContext()->isDependentContext()) { |
592 | // C++ [dcl.fct.default]p6 (DR217): |
593 | // Default arguments for a member function of a class template shall |
594 | // be specified on the initial declaration of the member function |
595 | // within the class template. |
596 | // |
597 | // Reading the tea leaves a bit in DR217 and its reference to DR205 |
598 | // leads me to the conclusion that one cannot add default function |
599 | // arguments for an out-of-line definition of a member function of a |
600 | // dependent type. |
601 | int WhichKind = 2; |
602 | if (CXXRecordDecl *Record |
603 | = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { |
604 | if (Record->getDescribedClassTemplate()) |
605 | WhichKind = 0; |
606 | else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) |
607 | WhichKind = 1; |
608 | else |
609 | WhichKind = 2; |
610 | } |
611 | |
612 | Diag(NewParam->getLocation(), |
613 | diag::err_param_default_argument_member_template_redecl) |
614 | << WhichKind |
615 | << NewParam->getDefaultArgRange(); |
616 | } |
617 | } |
618 | } |
619 | |
620 | // DR1344: If a default argument is added outside a class definition and that |
621 | // default argument makes the function a special member function, the program |
622 | // is ill-formed. This can only happen for constructors. |
623 | if (isa<CXXConstructorDecl>(New) && |
624 | New->getMinRequiredArguments() < Old->getMinRequiredArguments()) { |
625 | CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)), |
626 | OldSM = getSpecialMember(cast<CXXMethodDecl>(Old)); |
627 | if (NewSM != OldSM) { |
628 | ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments()); |
629 | assert(NewParam->hasDefaultArg())((NewParam->hasDefaultArg()) ? static_cast<void> (0) : __assert_fail ("NewParam->hasDefaultArg()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 629, __PRETTY_FUNCTION__)); |
630 | Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special) |
631 | << NewParam->getDefaultArgRange() << NewSM; |
632 | Diag(Old->getLocation(), diag::note_previous_declaration); |
633 | } |
634 | } |
635 | |
636 | const FunctionDecl *Def; |
637 | // C++11 [dcl.constexpr]p1: If any declaration of a function or function |
638 | // template has a constexpr specifier then all its declarations shall |
639 | // contain the constexpr specifier. |
640 | if (New->isConstexpr() != Old->isConstexpr()) { |
641 | Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) |
642 | << New << New->isConstexpr(); |
643 | Diag(Old->getLocation(), diag::note_previous_declaration); |
644 | Invalid = true; |
645 | } else if (!Old->getMostRecentDecl()->isInlined() && New->isInlined() && |
646 | Old->isDefined(Def) && |
647 | // If a friend function is inlined but does not have 'inline' |
648 | // specifier, it is a definition. Do not report attribute conflict |
649 | // in this case, redefinition will be diagnosed later. |
650 | (New->isInlineSpecified() || |
651 | New->getFriendObjectKind() == Decl::FOK_None)) { |
652 | // C++11 [dcl.fcn.spec]p4: |
653 | // If the definition of a function appears in a translation unit before its |
654 | // first declaration as inline, the program is ill-formed. |
655 | Diag(New->getLocation(), diag::err_inline_decl_follows_def) << New; |
656 | Diag(Def->getLocation(), diag::note_previous_definition); |
657 | Invalid = true; |
658 | } |
659 | |
660 | // C++17 [temp.deduct.guide]p3: |
661 | // Two deduction guide declarations in the same translation unit |
662 | // for the same class template shall not have equivalent |
663 | // parameter-declaration-clauses. |
664 | if (isa<CXXDeductionGuideDecl>(New) && |
665 | !New->isFunctionTemplateSpecialization()) { |
666 | Diag(New->getLocation(), diag::err_deduction_guide_redeclared); |
667 | Diag(Old->getLocation(), diag::note_previous_declaration); |
668 | } |
669 | |
670 | // C++11 [dcl.fct.default]p4: If a friend declaration specifies a default |
671 | // argument expression, that declaration shall be a definition and shall be |
672 | // the only declaration of the function or function template in the |
673 | // translation unit. |
674 | if (Old->getFriendObjectKind() == Decl::FOK_Undeclared && |
675 | functionDeclHasDefaultArgument(Old)) { |
676 | Diag(New->getLocation(), diag::err_friend_decl_with_def_arg_redeclared); |
677 | Diag(Old->getLocation(), diag::note_previous_declaration); |
678 | Invalid = true; |
679 | } |
680 | |
681 | return Invalid; |
682 | } |
683 | |
684 | NamedDecl * |
685 | Sema::ActOnDecompositionDeclarator(Scope *S, Declarator &D, |
686 | MultiTemplateParamsArg TemplateParamLists) { |
687 | assert(D.isDecompositionDeclarator())((D.isDecompositionDeclarator()) ? static_cast<void> (0 ) : __assert_fail ("D.isDecompositionDeclarator()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 687, __PRETTY_FUNCTION__)); |
688 | const DecompositionDeclarator &Decomp = D.getDecompositionDeclarator(); |
689 | |
690 | // The syntax only allows a decomposition declarator as a simple-declaration, |
691 | // a for-range-declaration, or a condition in Clang, but we parse it in more |
692 | // cases than that. |
693 | if (!D.mayHaveDecompositionDeclarator()) { |
694 | Diag(Decomp.getLSquareLoc(), diag::err_decomp_decl_context) |
695 | << Decomp.getSourceRange(); |
696 | return nullptr; |
697 | } |
698 | |
699 | if (!TemplateParamLists.empty()) { |
700 | // FIXME: There's no rule against this, but there are also no rules that |
701 | // would actually make it usable, so we reject it for now. |
702 | Diag(TemplateParamLists.front()->getTemplateLoc(), |
703 | diag::err_decomp_decl_template); |
704 | return nullptr; |
705 | } |
706 | |
707 | Diag(Decomp.getLSquareLoc(), |
708 | !getLangOpts().CPlusPlus17 |
709 | ? diag::ext_decomp_decl |
710 | : D.getContext() == DeclaratorContext::ConditionContext |
711 | ? diag::ext_decomp_decl_cond |
712 | : diag::warn_cxx14_compat_decomp_decl) |
713 | << Decomp.getSourceRange(); |
714 | |
715 | // The semantic context is always just the current context. |
716 | DeclContext *const DC = CurContext; |
717 | |
718 | // C++1z [dcl.dcl]/8: |
719 | // The decl-specifier-seq shall contain only the type-specifier auto |
720 | // and cv-qualifiers. |
721 | auto &DS = D.getDeclSpec(); |
722 | { |
723 | SmallVector<StringRef, 8> BadSpecifiers; |
724 | SmallVector<SourceLocation, 8> BadSpecifierLocs; |
725 | if (auto SCS = DS.getStorageClassSpec()) { |
726 | BadSpecifiers.push_back(DeclSpec::getSpecifierName(SCS)); |
727 | BadSpecifierLocs.push_back(DS.getStorageClassSpecLoc()); |
728 | } |
729 | if (auto TSCS = DS.getThreadStorageClassSpec()) { |
730 | BadSpecifiers.push_back(DeclSpec::getSpecifierName(TSCS)); |
731 | BadSpecifierLocs.push_back(DS.getThreadStorageClassSpecLoc()); |
732 | } |
733 | if (DS.isConstexprSpecified()) { |
734 | BadSpecifiers.push_back("constexpr"); |
735 | BadSpecifierLocs.push_back(DS.getConstexprSpecLoc()); |
736 | } |
737 | if (DS.isInlineSpecified()) { |
738 | BadSpecifiers.push_back("inline"); |
739 | BadSpecifierLocs.push_back(DS.getInlineSpecLoc()); |
740 | } |
741 | if (!BadSpecifiers.empty()) { |
742 | auto &&Err = Diag(BadSpecifierLocs.front(), diag::err_decomp_decl_spec); |
743 | Err << (int)BadSpecifiers.size() |
744 | << llvm::join(BadSpecifiers.begin(), BadSpecifiers.end(), " "); |
745 | // Don't add FixItHints to remove the specifiers; we do still respect |
746 | // them when building the underlying variable. |
747 | for (auto Loc : BadSpecifierLocs) |
748 | Err << SourceRange(Loc, Loc); |
749 | } |
750 | // We can't recover from it being declared as a typedef. |
751 | if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) |
752 | return nullptr; |
753 | } |
754 | |
755 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); |
756 | QualType R = TInfo->getType(); |
757 | |
758 | if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, |
759 | UPPC_DeclarationType)) |
760 | D.setInvalidType(); |
761 | |
762 | // The syntax only allows a single ref-qualifier prior to the decomposition |
763 | // declarator. No other declarator chunks are permitted. Also check the type |
764 | // specifier here. |
765 | if (DS.getTypeSpecType() != DeclSpec::TST_auto || |
766 | D.hasGroupingParens() || D.getNumTypeObjects() > 1 || |
767 | (D.getNumTypeObjects() == 1 && |
768 | D.getTypeObject(0).Kind != DeclaratorChunk::Reference)) { |
769 | Diag(Decomp.getLSquareLoc(), |
770 | (D.hasGroupingParens() || |
771 | (D.getNumTypeObjects() && |
772 | D.getTypeObject(0).Kind == DeclaratorChunk::Paren)) |
773 | ? diag::err_decomp_decl_parens |
774 | : diag::err_decomp_decl_type) |
775 | << R; |
776 | |
777 | // In most cases, there's no actual problem with an explicitly-specified |
778 | // type, but a function type won't work here, and ActOnVariableDeclarator |
779 | // shouldn't be called for such a type. |
780 | if (R->isFunctionType()) |
781 | D.setInvalidType(); |
782 | } |
783 | |
784 | // Build the BindingDecls. |
785 | SmallVector<BindingDecl*, 8> Bindings; |
786 | |
787 | // Build the BindingDecls. |
788 | for (auto &B : D.getDecompositionDeclarator().bindings()) { |
789 | // Check for name conflicts. |
790 | DeclarationNameInfo NameInfo(B.Name, B.NameLoc); |
791 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, |
792 | ForVisibleRedeclaration); |
793 | LookupName(Previous, S, |
794 | /*CreateBuiltins*/DC->getRedeclContext()->isTranslationUnit()); |
795 | |
796 | // It's not permitted to shadow a template parameter name. |
797 | if (Previous.isSingleResult() && |
798 | Previous.getFoundDecl()->isTemplateParameter()) { |
799 | DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), |
800 | Previous.getFoundDecl()); |
801 | Previous.clear(); |
802 | } |
803 | |
804 | bool ConsiderLinkage = DC->isFunctionOrMethod() && |
805 | DS.getStorageClassSpec() == DeclSpec::SCS_extern; |
806 | FilterLookupForScope(Previous, DC, S, ConsiderLinkage, |
807 | /*AllowInlineNamespace*/false); |
808 | if (!Previous.empty()) { |
809 | auto *Old = Previous.getRepresentativeDecl(); |
810 | Diag(B.NameLoc, diag::err_redefinition) << B.Name; |
811 | Diag(Old->getLocation(), diag::note_previous_definition); |
812 | } |
813 | |
814 | auto *BD = BindingDecl::Create(Context, DC, B.NameLoc, B.Name); |
815 | PushOnScopeChains(BD, S, true); |
816 | Bindings.push_back(BD); |
817 | ParsingInitForAutoVars.insert(BD); |
818 | } |
819 | |
820 | // There are no prior lookup results for the variable itself, because it |
821 | // is unnamed. |
822 | DeclarationNameInfo NameInfo((IdentifierInfo *)nullptr, |
823 | Decomp.getLSquareLoc()); |
824 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, |
825 | ForVisibleRedeclaration); |
826 | |
827 | // Build the variable that holds the non-decomposed object. |
828 | bool AddToScope = true; |
829 | NamedDecl *New = |
830 | ActOnVariableDeclarator(S, D, DC, TInfo, Previous, |
831 | MultiTemplateParamsArg(), AddToScope, Bindings); |
832 | if (AddToScope) { |
833 | S->AddDecl(New); |
834 | CurContext->addHiddenDecl(New); |
835 | } |
836 | |
837 | if (isInOpenMPDeclareTargetContext()) |
838 | checkDeclIsAllowedInOpenMPTarget(nullptr, New); |
839 | |
840 | return New; |
841 | } |
842 | |
843 | static bool checkSimpleDecomposition( |
844 | Sema &S, ArrayRef<BindingDecl *> Bindings, ValueDecl *Src, |
845 | QualType DecompType, const llvm::APSInt &NumElems, QualType ElemType, |
846 | llvm::function_ref<ExprResult(SourceLocation, Expr *, unsigned)> GetInit) { |
847 | if ((int64_t)Bindings.size() != NumElems) { |
848 | S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings) |
849 | << DecompType << (unsigned)Bindings.size() << NumElems.toString(10) |
850 | << (NumElems < Bindings.size()); |
851 | return true; |
852 | } |
853 | |
854 | unsigned I = 0; |
855 | for (auto *B : Bindings) { |
856 | SourceLocation Loc = B->getLocation(); |
857 | ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc); |
858 | if (E.isInvalid()) |
859 | return true; |
860 | E = GetInit(Loc, E.get(), I++); |
861 | if (E.isInvalid()) |
862 | return true; |
863 | B->setBinding(ElemType, E.get()); |
864 | } |
865 | |
866 | return false; |
867 | } |
868 | |
869 | static bool checkArrayLikeDecomposition(Sema &S, |
870 | ArrayRef<BindingDecl *> Bindings, |
871 | ValueDecl *Src, QualType DecompType, |
872 | const llvm::APSInt &NumElems, |
873 | QualType ElemType) { |
874 | return checkSimpleDecomposition( |
875 | S, Bindings, Src, DecompType, NumElems, ElemType, |
876 | [&](SourceLocation Loc, Expr *Base, unsigned I) -> ExprResult { |
877 | ExprResult E = S.ActOnIntegerConstant(Loc, I); |
878 | if (E.isInvalid()) |
879 | return ExprError(); |
880 | return S.CreateBuiltinArraySubscriptExpr(Base, Loc, E.get(), Loc); |
881 | }); |
882 | } |
883 | |
884 | static bool checkArrayDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings, |
885 | ValueDecl *Src, QualType DecompType, |
886 | const ConstantArrayType *CAT) { |
887 | return checkArrayLikeDecomposition(S, Bindings, Src, DecompType, |
888 | llvm::APSInt(CAT->getSize()), |
889 | CAT->getElementType()); |
890 | } |
891 | |
892 | static bool checkVectorDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings, |
893 | ValueDecl *Src, QualType DecompType, |
894 | const VectorType *VT) { |
895 | return checkArrayLikeDecomposition( |
896 | S, Bindings, Src, DecompType, llvm::APSInt::get(VT->getNumElements()), |
897 | S.Context.getQualifiedType(VT->getElementType(), |
898 | DecompType.getQualifiers())); |
899 | } |
900 | |
901 | static bool checkComplexDecomposition(Sema &S, |
902 | ArrayRef<BindingDecl *> Bindings, |
903 | ValueDecl *Src, QualType DecompType, |
904 | const ComplexType *CT) { |
905 | return checkSimpleDecomposition( |
906 | S, Bindings, Src, DecompType, llvm::APSInt::get(2), |
907 | S.Context.getQualifiedType(CT->getElementType(), |
908 | DecompType.getQualifiers()), |
909 | [&](SourceLocation Loc, Expr *Base, unsigned I) -> ExprResult { |
910 | return S.CreateBuiltinUnaryOp(Loc, I ? UO_Imag : UO_Real, Base); |
911 | }); |
912 | } |
913 | |
914 | static std::string printTemplateArgs(const PrintingPolicy &PrintingPolicy, |
915 | TemplateArgumentListInfo &Args) { |
916 | SmallString<128> SS; |
917 | llvm::raw_svector_ostream OS(SS); |
918 | bool First = true; |
919 | for (auto &Arg : Args.arguments()) { |
920 | if (!First) |
921 | OS << ", "; |
922 | Arg.getArgument().print(PrintingPolicy, OS); |
923 | First = false; |
924 | } |
925 | return OS.str(); |
926 | } |
927 | |
928 | static bool lookupStdTypeTraitMember(Sema &S, LookupResult &TraitMemberLookup, |
929 | SourceLocation Loc, StringRef Trait, |
930 | TemplateArgumentListInfo &Args, |
931 | unsigned DiagID) { |
932 | auto DiagnoseMissing = [&] { |
933 | if (DiagID) |
934 | S.Diag(Loc, DiagID) << printTemplateArgs(S.Context.getPrintingPolicy(), |
935 | Args); |
936 | return true; |
937 | }; |
938 | |
939 | // FIXME: Factor out duplication with lookupPromiseType in SemaCoroutine. |
940 | NamespaceDecl *Std = S.getStdNamespace(); |
941 | if (!Std) |
942 | return DiagnoseMissing(); |
943 | |
944 | // Look up the trait itself, within namespace std. We can diagnose various |
945 | // problems with this lookup even if we've been asked to not diagnose a |
946 | // missing specialization, because this can only fail if the user has been |
947 | // declaring their own names in namespace std or we don't support the |
948 | // standard library implementation in use. |
949 | LookupResult Result(S, &S.PP.getIdentifierTable().get(Trait), |
950 | Loc, Sema::LookupOrdinaryName); |
951 | if (!S.LookupQualifiedName(Result, Std)) |
952 | return DiagnoseMissing(); |
953 | if (Result.isAmbiguous()) |
954 | return true; |
955 | |
956 | ClassTemplateDecl *TraitTD = Result.getAsSingle<ClassTemplateDecl>(); |
957 | if (!TraitTD) { |
958 | Result.suppressDiagnostics(); |
959 | NamedDecl *Found = *Result.begin(); |
960 | S.Diag(Loc, diag::err_std_type_trait_not_class_template) << Trait; |
961 | S.Diag(Found->getLocation(), diag::note_declared_at); |
962 | return true; |
963 | } |
964 | |
965 | // Build the template-id. |
966 | QualType TraitTy = S.CheckTemplateIdType(TemplateName(TraitTD), Loc, Args); |
967 | if (TraitTy.isNull()) |
968 | return true; |
969 | if (!S.isCompleteType(Loc, TraitTy)) { |
970 | if (DiagID) |
971 | S.RequireCompleteType( |
972 | Loc, TraitTy, DiagID, |
973 | printTemplateArgs(S.Context.getPrintingPolicy(), Args)); |
974 | return true; |
975 | } |
976 | |
977 | CXXRecordDecl *RD = TraitTy->getAsCXXRecordDecl(); |
978 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 978, __PRETTY_FUNCTION__)); |
979 | |
980 | // Look up the member of the trait type. |
981 | S.LookupQualifiedName(TraitMemberLookup, RD); |
982 | return TraitMemberLookup.isAmbiguous(); |
983 | } |
984 | |
985 | static TemplateArgumentLoc |
986 | getTrivialIntegralTemplateArgument(Sema &S, SourceLocation Loc, QualType T, |
987 | uint64_t I) { |
988 | TemplateArgument Arg(S.Context, S.Context.MakeIntValue(I, T), T); |
989 | return S.getTrivialTemplateArgumentLoc(Arg, T, Loc); |
990 | } |
991 | |
992 | static TemplateArgumentLoc |
993 | getTrivialTypeTemplateArgument(Sema &S, SourceLocation Loc, QualType T) { |
994 | return S.getTrivialTemplateArgumentLoc(TemplateArgument(T), QualType(), Loc); |
995 | } |
996 | |
997 | namespace { enum class IsTupleLike { TupleLike, NotTupleLike, Error }; } |
998 | |
999 | static IsTupleLike isTupleLike(Sema &S, SourceLocation Loc, QualType T, |
1000 | llvm::APSInt &Size) { |
1001 | EnterExpressionEvaluationContext ContextRAII( |
1002 | S, Sema::ExpressionEvaluationContext::ConstantEvaluated); |
1003 | |
1004 | DeclarationName Value = S.PP.getIdentifierInfo("value"); |
1005 | LookupResult R(S, Value, Loc, Sema::LookupOrdinaryName); |
1006 | |
1007 | // Form template argument list for tuple_size<T>. |
1008 | TemplateArgumentListInfo Args(Loc, Loc); |
1009 | Args.addArgument(getTrivialTypeTemplateArgument(S, Loc, T)); |
1010 | |
1011 | // If there's no tuple_size specialization, it's not tuple-like. |
1012 | if (lookupStdTypeTraitMember(S, R, Loc, "tuple_size", Args, /*DiagID*/0)) |
1013 | return IsTupleLike::NotTupleLike; |
1014 | |
1015 | // If we get this far, we've committed to the tuple interpretation, but |
1016 | // we can still fail if there actually isn't a usable ::value. |
1017 | |
1018 | struct ICEDiagnoser : Sema::VerifyICEDiagnoser { |
1019 | LookupResult &R; |
1020 | TemplateArgumentListInfo &Args; |
1021 | ICEDiagnoser(LookupResult &R, TemplateArgumentListInfo &Args) |
1022 | : R(R), Args(Args) {} |
1023 | void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) { |
1024 | S.Diag(Loc, diag::err_decomp_decl_std_tuple_size_not_constant) |
1025 | << printTemplateArgs(S.Context.getPrintingPolicy(), Args); |
1026 | } |
1027 | } Diagnoser(R, Args); |
1028 | |
1029 | if (R.empty()) { |
1030 | Diagnoser.diagnoseNotICE(S, Loc, SourceRange()); |
1031 | return IsTupleLike::Error; |
1032 | } |
1033 | |
1034 | ExprResult E = |
1035 | S.BuildDeclarationNameExpr(CXXScopeSpec(), R, /*NeedsADL*/false); |
1036 | if (E.isInvalid()) |
1037 | return IsTupleLike::Error; |
1038 | |
1039 | E = S.VerifyIntegerConstantExpression(E.get(), &Size, Diagnoser, false); |
1040 | if (E.isInvalid()) |
1041 | return IsTupleLike::Error; |
1042 | |
1043 | return IsTupleLike::TupleLike; |
1044 | } |
1045 | |
1046 | /// \return std::tuple_element<I, T>::type. |
1047 | static QualType getTupleLikeElementType(Sema &S, SourceLocation Loc, |
1048 | unsigned I, QualType T) { |
1049 | // Form template argument list for tuple_element<I, T>. |
1050 | TemplateArgumentListInfo Args(Loc, Loc); |
1051 | Args.addArgument( |
1052 | getTrivialIntegralTemplateArgument(S, Loc, S.Context.getSizeType(), I)); |
1053 | Args.addArgument(getTrivialTypeTemplateArgument(S, Loc, T)); |
1054 | |
1055 | DeclarationName TypeDN = S.PP.getIdentifierInfo("type"); |
1056 | LookupResult R(S, TypeDN, Loc, Sema::LookupOrdinaryName); |
1057 | if (lookupStdTypeTraitMember( |
1058 | S, R, Loc, "tuple_element", Args, |
1059 | diag::err_decomp_decl_std_tuple_element_not_specialized)) |
1060 | return QualType(); |
1061 | |
1062 | auto *TD = R.getAsSingle<TypeDecl>(); |
1063 | if (!TD) { |
1064 | R.suppressDiagnostics(); |
1065 | S.Diag(Loc, diag::err_decomp_decl_std_tuple_element_not_specialized) |
1066 | << printTemplateArgs(S.Context.getPrintingPolicy(), Args); |
1067 | if (!R.empty()) |
1068 | S.Diag(R.getRepresentativeDecl()->getLocation(), diag::note_declared_at); |
1069 | return QualType(); |
1070 | } |
1071 | |
1072 | return S.Context.getTypeDeclType(TD); |
1073 | } |
1074 | |
1075 | namespace { |
1076 | struct BindingDiagnosticTrap { |
1077 | Sema &S; |
1078 | DiagnosticErrorTrap Trap; |
1079 | BindingDecl *BD; |
1080 | |
1081 | BindingDiagnosticTrap(Sema &S, BindingDecl *BD) |
1082 | : S(S), Trap(S.Diags), BD(BD) {} |
1083 | ~BindingDiagnosticTrap() { |
1084 | if (Trap.hasErrorOccurred()) |
1085 | S.Diag(BD->getLocation(), diag::note_in_binding_decl_init) << BD; |
1086 | } |
1087 | }; |
1088 | } |
1089 | |
1090 | static bool checkTupleLikeDecomposition(Sema &S, |
1091 | ArrayRef<BindingDecl *> Bindings, |
1092 | VarDecl *Src, QualType DecompType, |
1093 | const llvm::APSInt &TupleSize) { |
1094 | if ((int64_t)Bindings.size() != TupleSize) { |
1095 | S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings) |
1096 | << DecompType << (unsigned)Bindings.size() << TupleSize.toString(10) |
1097 | << (TupleSize < Bindings.size()); |
1098 | return true; |
1099 | } |
1100 | |
1101 | if (Bindings.empty()) |
1102 | return false; |
1103 | |
1104 | DeclarationName GetDN = S.PP.getIdentifierInfo("get"); |
1105 | |
1106 | // [dcl.decomp]p3: |
1107 | // The unqualified-id get is looked up in the scope of E by class member |
1108 | // access lookup ... |
1109 | LookupResult MemberGet(S, GetDN, Src->getLocation(), Sema::LookupMemberName); |
1110 | bool UseMemberGet = false; |
1111 | if (S.isCompleteType(Src->getLocation(), DecompType)) { |
1112 | if (auto *RD = DecompType->getAsCXXRecordDecl()) |
1113 | S.LookupQualifiedName(MemberGet, RD); |
1114 | if (MemberGet.isAmbiguous()) |
1115 | return true; |
1116 | // ... and if that finds at least one declaration that is a function |
1117 | // template whose first template parameter is a non-type parameter ... |
1118 | for (NamedDecl *D : MemberGet) { |
1119 | if (FunctionTemplateDecl *FTD = |
1120 | dyn_cast<FunctionTemplateDecl>(D->getUnderlyingDecl())) { |
1121 | TemplateParameterList *TPL = FTD->getTemplateParameters(); |
1122 | if (TPL->size() != 0 && |
1123 | isa<NonTypeTemplateParmDecl>(TPL->getParam(0))) { |
1124 | // ... the initializer is e.get<i>(). |
1125 | UseMemberGet = true; |
1126 | break; |
1127 | } |
1128 | } |
1129 | } |
1130 | } |
1131 | |
1132 | unsigned I = 0; |
1133 | for (auto *B : Bindings) { |
1134 | BindingDiagnosticTrap Trap(S, B); |
1135 | SourceLocation Loc = B->getLocation(); |
1136 | |
1137 | ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc); |
1138 | if (E.isInvalid()) |
1139 | return true; |
1140 | |
1141 | // e is an lvalue if the type of the entity is an lvalue reference and |
1142 | // an xvalue otherwise |
1143 | if (!Src->getType()->isLValueReferenceType()) |
1144 | E = ImplicitCastExpr::Create(S.Context, E.get()->getType(), CK_NoOp, |
1145 | E.get(), nullptr, VK_XValue); |
1146 | |
1147 | TemplateArgumentListInfo Args(Loc, Loc); |
1148 | Args.addArgument( |
1149 | getTrivialIntegralTemplateArgument(S, Loc, S.Context.getSizeType(), I)); |
1150 | |
1151 | if (UseMemberGet) { |
1152 | // if [lookup of member get] finds at least one declaration, the |
1153 | // initializer is e.get<i-1>(). |
1154 | E = S.BuildMemberReferenceExpr(E.get(), DecompType, Loc, false, |
1155 | CXXScopeSpec(), SourceLocation(), nullptr, |
1156 | MemberGet, &Args, nullptr); |
1157 | if (E.isInvalid()) |
1158 | return true; |
1159 | |
1160 | E = S.BuildCallExpr(nullptr, E.get(), Loc, None, Loc); |
1161 | } else { |
1162 | // Otherwise, the initializer is get<i-1>(e), where get is looked up |
1163 | // in the associated namespaces. |
1164 | Expr *Get = UnresolvedLookupExpr::Create( |
1165 | S.Context, nullptr, NestedNameSpecifierLoc(), SourceLocation(), |
1166 | DeclarationNameInfo(GetDN, Loc), /*RequiresADL*/true, &Args, |
1167 | UnresolvedSetIterator(), UnresolvedSetIterator()); |
1168 | |
1169 | Expr *Arg = E.get(); |
1170 | E = S.BuildCallExpr(nullptr, Get, Loc, Arg, Loc); |
1171 | } |
1172 | if (E.isInvalid()) |
1173 | return true; |
1174 | Expr *Init = E.get(); |
1175 | |
1176 | // Given the type T designated by std::tuple_element<i - 1, E>::type, |
1177 | QualType T = getTupleLikeElementType(S, Loc, I, DecompType); |
1178 | if (T.isNull()) |
1179 | return true; |
1180 | |
1181 | // each vi is a variable of type "reference to T" initialized with the |
1182 | // initializer, where the reference is an lvalue reference if the |
1183 | // initializer is an lvalue and an rvalue reference otherwise |
1184 | QualType RefType = |
1185 | S.BuildReferenceType(T, E.get()->isLValue(), Loc, B->getDeclName()); |
1186 | if (RefType.isNull()) |
1187 | return true; |
1188 | auto *RefVD = VarDecl::Create( |
1189 | S.Context, Src->getDeclContext(), Loc, Loc, |
1190 | B->getDeclName().getAsIdentifierInfo(), RefType, |
1191 | S.Context.getTrivialTypeSourceInfo(T, Loc), Src->getStorageClass()); |
1192 | RefVD->setLexicalDeclContext(Src->getLexicalDeclContext()); |
1193 | RefVD->setTSCSpec(Src->getTSCSpec()); |
1194 | RefVD->setImplicit(); |
1195 | if (Src->isInlineSpecified()) |
1196 | RefVD->setInlineSpecified(); |
1197 | RefVD->getLexicalDeclContext()->addHiddenDecl(RefVD); |
1198 | |
1199 | InitializedEntity Entity = InitializedEntity::InitializeBinding(RefVD); |
1200 | InitializationKind Kind = InitializationKind::CreateCopy(Loc, Loc); |
1201 | InitializationSequence Seq(S, Entity, Kind, Init); |
1202 | E = Seq.Perform(S, Entity, Kind, Init); |
1203 | if (E.isInvalid()) |
1204 | return true; |
1205 | E = S.ActOnFinishFullExpr(E.get(), Loc, /*DiscardedValue*/ false); |
1206 | if (E.isInvalid()) |
1207 | return true; |
1208 | RefVD->setInit(E.get()); |
1209 | RefVD->checkInitIsICE(); |
1210 | |
1211 | E = S.BuildDeclarationNameExpr(CXXScopeSpec(), |
1212 | DeclarationNameInfo(B->getDeclName(), Loc), |
1213 | RefVD); |
1214 | if (E.isInvalid()) |
1215 | return true; |
1216 | |
1217 | B->setBinding(T, E.get()); |
1218 | I++; |
1219 | } |
1220 | |
1221 | return false; |
1222 | } |
1223 | |
1224 | /// Find the base class to decompose in a built-in decomposition of a class type. |
1225 | /// This base class search is, unfortunately, not quite like any other that we |
1226 | /// perform anywhere else in C++. |
1227 | static DeclAccessPair findDecomposableBaseClass(Sema &S, SourceLocation Loc, |
1228 | const CXXRecordDecl *RD, |
1229 | CXXCastPath &BasePath) { |
1230 | auto BaseHasFields = [](const CXXBaseSpecifier *Specifier, |
1231 | CXXBasePath &Path) { |
1232 | return Specifier->getType()->getAsCXXRecordDecl()->hasDirectFields(); |
1233 | }; |
1234 | |
1235 | const CXXRecordDecl *ClassWithFields = nullptr; |
1236 | AccessSpecifier AS = AS_public; |
1237 | if (RD->hasDirectFields()) |
1238 | // [dcl.decomp]p4: |
1239 | // Otherwise, all of E's non-static data members shall be public direct |
1240 | // members of E ... |
1241 | ClassWithFields = RD; |
1242 | else { |
1243 | // ... or of ... |
1244 | CXXBasePaths Paths; |
1245 | Paths.setOrigin(const_cast<CXXRecordDecl*>(RD)); |
1246 | if (!RD->lookupInBases(BaseHasFields, Paths)) { |
1247 | // If no classes have fields, just decompose RD itself. (This will work |
1248 | // if and only if zero bindings were provided.) |
1249 | return DeclAccessPair::make(const_cast<CXXRecordDecl*>(RD), AS_public); |
1250 | } |
1251 | |
1252 | CXXBasePath *BestPath = nullptr; |
1253 | for (auto &P : Paths) { |
1254 | if (!BestPath) |
1255 | BestPath = &P; |
1256 | else if (!S.Context.hasSameType(P.back().Base->getType(), |
1257 | BestPath->back().Base->getType())) { |
1258 | // ... the same ... |
1259 | S.Diag(Loc, diag::err_decomp_decl_multiple_bases_with_members) |
1260 | << false << RD << BestPath->back().Base->getType() |
1261 | << P.back().Base->getType(); |
1262 | return DeclAccessPair(); |
1263 | } else if (P.Access < BestPath->Access) { |
1264 | BestPath = &P; |
1265 | } |
1266 | } |
1267 | |
1268 | // ... unambiguous ... |
1269 | QualType BaseType = BestPath->back().Base->getType(); |
1270 | if (Paths.isAmbiguous(S.Context.getCanonicalType(BaseType))) { |
1271 | S.Diag(Loc, diag::err_decomp_decl_ambiguous_base) |
1272 | << RD << BaseType << S.getAmbiguousPathsDisplayString(Paths); |
1273 | return DeclAccessPair(); |
1274 | } |
1275 | |
1276 | // ... [accessible, implied by other rules] base class of E. |
1277 | S.CheckBaseClassAccess(Loc, BaseType, S.Context.getRecordType(RD), |
1278 | *BestPath, diag::err_decomp_decl_inaccessible_base); |
1279 | AS = BestPath->Access; |
1280 | |
1281 | ClassWithFields = BaseType->getAsCXXRecordDecl(); |
1282 | S.BuildBasePathArray(Paths, BasePath); |
1283 | } |
1284 | |
1285 | // The above search did not check whether the selected class itself has base |
1286 | // classes with fields, so check that now. |
1287 | CXXBasePaths Paths; |
1288 | if (ClassWithFields->lookupInBases(BaseHasFields, Paths)) { |
1289 | S.Diag(Loc, diag::err_decomp_decl_multiple_bases_with_members) |
1290 | << (ClassWithFields == RD) << RD << ClassWithFields |
1291 | << Paths.front().back().Base->getType(); |
1292 | return DeclAccessPair(); |
1293 | } |
1294 | |
1295 | return DeclAccessPair::make(const_cast<CXXRecordDecl*>(ClassWithFields), AS); |
1296 | } |
1297 | |
1298 | static bool checkMemberDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings, |
1299 | ValueDecl *Src, QualType DecompType, |
1300 | const CXXRecordDecl *OrigRD) { |
1301 | if (S.RequireCompleteType(Src->getLocation(), DecompType, |
1302 | diag::err_incomplete_type)) |
1303 | return true; |
1304 | |
1305 | CXXCastPath BasePath; |
1306 | DeclAccessPair BasePair = |
1307 | findDecomposableBaseClass(S, Src->getLocation(), OrigRD, BasePath); |
1308 | const CXXRecordDecl *RD = cast_or_null<CXXRecordDecl>(BasePair.getDecl()); |
1309 | if (!RD) |
1310 | return true; |
1311 | QualType BaseType = S.Context.getQualifiedType(S.Context.getRecordType(RD), |
1312 | DecompType.getQualifiers()); |
1313 | |
1314 | auto DiagnoseBadNumberOfBindings = [&]() -> bool { |
1315 | unsigned NumFields = |
1316 | std::count_if(RD->field_begin(), RD->field_end(), |
1317 | [](FieldDecl *FD) { return !FD->isUnnamedBitfield(); }); |
1318 | assert(Bindings.size() != NumFields)((Bindings.size() != NumFields) ? static_cast<void> (0) : __assert_fail ("Bindings.size() != NumFields", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 1318, __PRETTY_FUNCTION__)); |
1319 | S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings) |
1320 | << DecompType << (unsigned)Bindings.size() << NumFields |
1321 | << (NumFields < Bindings.size()); |
1322 | return true; |
1323 | }; |
1324 | |
1325 | // all of E's non-static data members shall be [...] well-formed |
1326 | // when named as e.name in the context of the structured binding, |
1327 | // E shall not have an anonymous union member, ... |
1328 | unsigned I = 0; |
1329 | for (auto *FD : RD->fields()) { |
1330 | if (FD->isUnnamedBitfield()) |
1331 | continue; |
1332 | |
1333 | if (FD->isAnonymousStructOrUnion()) { |
1334 | S.Diag(Src->getLocation(), diag::err_decomp_decl_anon_union_member) |
1335 | << DecompType << FD->getType()->isUnionType(); |
1336 | S.Diag(FD->getLocation(), diag::note_declared_at); |
1337 | return true; |
1338 | } |
1339 | |
1340 | // We have a real field to bind. |
1341 | if (I >= Bindings.size()) |
1342 | return DiagnoseBadNumberOfBindings(); |
1343 | auto *B = Bindings[I++]; |
1344 | SourceLocation Loc = B->getLocation(); |
1345 | |
1346 | // The field must be accessible in the context of the structured binding. |
1347 | // We already checked that the base class is accessible. |
1348 | // FIXME: Add 'const' to AccessedEntity's classes so we can remove the |
1349 | // const_cast here. |
1350 | S.CheckStructuredBindingMemberAccess( |
1351 | Loc, const_cast<CXXRecordDecl *>(OrigRD), |
1352 | DeclAccessPair::make(FD, CXXRecordDecl::MergeAccess( |
1353 | BasePair.getAccess(), FD->getAccess()))); |
1354 | |
1355 | // Initialize the binding to Src.FD. |
1356 | ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc); |
1357 | if (E.isInvalid()) |
1358 | return true; |
1359 | E = S.ImpCastExprToType(E.get(), BaseType, CK_UncheckedDerivedToBase, |
1360 | VK_LValue, &BasePath); |
1361 | if (E.isInvalid()) |
1362 | return true; |
1363 | E = S.BuildFieldReferenceExpr(E.get(), /*IsArrow*/ false, Loc, |
1364 | CXXScopeSpec(), FD, |
1365 | DeclAccessPair::make(FD, FD->getAccess()), |
1366 | DeclarationNameInfo(FD->getDeclName(), Loc)); |
1367 | if (E.isInvalid()) |
1368 | return true; |
1369 | |
1370 | // If the type of the member is T, the referenced type is cv T, where cv is |
1371 | // the cv-qualification of the decomposition expression. |
1372 | // |
1373 | // FIXME: We resolve a defect here: if the field is mutable, we do not add |
1374 | // 'const' to the type of the field. |
1375 | Qualifiers Q = DecompType.getQualifiers(); |
1376 | if (FD->isMutable()) |
1377 | Q.removeConst(); |
1378 | B->setBinding(S.BuildQualifiedType(FD->getType(), Loc, Q), E.get()); |
1379 | } |
1380 | |
1381 | if (I != Bindings.size()) |
1382 | return DiagnoseBadNumberOfBindings(); |
1383 | |
1384 | return false; |
1385 | } |
1386 | |
1387 | void Sema::CheckCompleteDecompositionDeclaration(DecompositionDecl *DD) { |
1388 | QualType DecompType = DD->getType(); |
1389 | |
1390 | // If the type of the decomposition is dependent, then so is the type of |
1391 | // each binding. |
1392 | if (DecompType->isDependentType()) { |
1393 | for (auto *B : DD->bindings()) |
1394 | B->setType(Context.DependentTy); |
1395 | return; |
1396 | } |
1397 | |
1398 | DecompType = DecompType.getNonReferenceType(); |
1399 | ArrayRef<BindingDecl*> Bindings = DD->bindings(); |
1400 | |
1401 | // C++1z [dcl.decomp]/2: |
1402 | // If E is an array type [...] |
1403 | // As an extension, we also support decomposition of built-in complex and |
1404 | // vector types. |
1405 | if (auto *CAT = Context.getAsConstantArrayType(DecompType)) { |
1406 | if (checkArrayDecomposition(*this, Bindings, DD, DecompType, CAT)) |
1407 | DD->setInvalidDecl(); |
1408 | return; |
1409 | } |
1410 | if (auto *VT = DecompType->getAs<VectorType>()) { |
1411 | if (checkVectorDecomposition(*this, Bindings, DD, DecompType, VT)) |
1412 | DD->setInvalidDecl(); |
1413 | return; |
1414 | } |
1415 | if (auto *CT = DecompType->getAs<ComplexType>()) { |
1416 | if (checkComplexDecomposition(*this, Bindings, DD, DecompType, CT)) |
1417 | DD->setInvalidDecl(); |
1418 | return; |
1419 | } |
1420 | |
1421 | // C++1z [dcl.decomp]/3: |
1422 | // if the expression std::tuple_size<E>::value is a well-formed integral |
1423 | // constant expression, [...] |
1424 | llvm::APSInt TupleSize(32); |
1425 | switch (isTupleLike(*this, DD->getLocation(), DecompType, TupleSize)) { |
1426 | case IsTupleLike::Error: |
1427 | DD->setInvalidDecl(); |
1428 | return; |
1429 | |
1430 | case IsTupleLike::TupleLike: |
1431 | if (checkTupleLikeDecomposition(*this, Bindings, DD, DecompType, TupleSize)) |
1432 | DD->setInvalidDecl(); |
1433 | return; |
1434 | |
1435 | case IsTupleLike::NotTupleLike: |
1436 | break; |
1437 | } |
1438 | |
1439 | // C++1z [dcl.dcl]/8: |
1440 | // [E shall be of array or non-union class type] |
1441 | CXXRecordDecl *RD = DecompType->getAsCXXRecordDecl(); |
1442 | if (!RD || RD->isUnion()) { |
1443 | Diag(DD->getLocation(), diag::err_decomp_decl_unbindable_type) |
1444 | << DD << !RD << DecompType; |
1445 | DD->setInvalidDecl(); |
1446 | return; |
1447 | } |
1448 | |
1449 | // C++1z [dcl.decomp]/4: |
1450 | // all of E's non-static data members shall be [...] direct members of |
1451 | // E or of the same unambiguous public base class of E, ... |
1452 | if (checkMemberDecomposition(*this, Bindings, DD, DecompType, RD)) |
1453 | DD->setInvalidDecl(); |
1454 | } |
1455 | |
1456 | /// Merge the exception specifications of two variable declarations. |
1457 | /// |
1458 | /// This is called when there's a redeclaration of a VarDecl. The function |
1459 | /// checks if the redeclaration might have an exception specification and |
1460 | /// validates compatibility and merges the specs if necessary. |
1461 | void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { |
1462 | // Shortcut if exceptions are disabled. |
1463 | if (!getLangOpts().CXXExceptions) |
1464 | return; |
1465 | |
1466 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 1467, __PRETTY_FUNCTION__)) |
1467 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 1467, __PRETTY_FUNCTION__)); |
1468 | |
1469 | QualType NewType = New->getType(); |
1470 | QualType OldType = Old->getType(); |
1471 | |
1472 | // We're only interested in pointers and references to functions, as well |
1473 | // as pointers to member functions. |
1474 | if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { |
1475 | NewType = R->getPointeeType(); |
1476 | OldType = OldType->getAs<ReferenceType>()->getPointeeType(); |
1477 | } else if (const PointerType *P = NewType->getAs<PointerType>()) { |
1478 | NewType = P->getPointeeType(); |
1479 | OldType = OldType->getAs<PointerType>()->getPointeeType(); |
1480 | } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { |
1481 | NewType = M->getPointeeType(); |
1482 | OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); |
1483 | } |
1484 | |
1485 | if (!NewType->isFunctionProtoType()) |
1486 | return; |
1487 | |
1488 | // There's lots of special cases for functions. For function pointers, system |
1489 | // libraries are hopefully not as broken so that we don't need these |
1490 | // workarounds. |
1491 | if (CheckEquivalentExceptionSpec( |
1492 | OldType->getAs<FunctionProtoType>(), Old->getLocation(), |
1493 | NewType->getAs<FunctionProtoType>(), New->getLocation())) { |
1494 | New->setInvalidDecl(); |
1495 | } |
1496 | } |
1497 | |
1498 | /// CheckCXXDefaultArguments - Verify that the default arguments for a |
1499 | /// function declaration are well-formed according to C++ |
1500 | /// [dcl.fct.default]. |
1501 | void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { |
1502 | unsigned NumParams = FD->getNumParams(); |
1503 | unsigned p; |
1504 | |
1505 | // Find first parameter with a default argument |
1506 | for (p = 0; p < NumParams; ++p) { |
1507 | ParmVarDecl *Param = FD->getParamDecl(p); |
1508 | if (Param->hasDefaultArg()) |
1509 | break; |
1510 | } |
1511 | |
1512 | // C++11 [dcl.fct.default]p4: |
1513 | // In a given function declaration, each parameter subsequent to a parameter |
1514 | // with a default argument shall have a default argument supplied in this or |
1515 | // a previous declaration or shall be a function parameter pack. A default |
1516 | // argument shall not be redefined by a later declaration (not even to the |
1517 | // same value). |
1518 | unsigned LastMissingDefaultArg = 0; |
1519 | for (; p < NumParams; ++p) { |
1520 | ParmVarDecl *Param = FD->getParamDecl(p); |
1521 | if (!Param->hasDefaultArg() && !Param->isParameterPack()) { |
1522 | if (Param->isInvalidDecl()) |
1523 | /* We already complained about this parameter. */; |
1524 | else if (Param->getIdentifier()) |
1525 | Diag(Param->getLocation(), |
1526 | diag::err_param_default_argument_missing_name) |
1527 | << Param->getIdentifier(); |
1528 | else |
1529 | Diag(Param->getLocation(), |
1530 | diag::err_param_default_argument_missing); |
1531 | |
1532 | LastMissingDefaultArg = p; |
1533 | } |
1534 | } |
1535 | |
1536 | if (LastMissingDefaultArg > 0) { |
1537 | // Some default arguments were missing. Clear out all of the |
1538 | // default arguments up to (and including) the last missing |
1539 | // default argument, so that we leave the function parameters |
1540 | // in a semantically valid state. |
1541 | for (p = 0; p <= LastMissingDefaultArg; ++p) { |
1542 | ParmVarDecl *Param = FD->getParamDecl(p); |
1543 | if (Param->hasDefaultArg()) { |
1544 | Param->setDefaultArg(nullptr); |
1545 | } |
1546 | } |
1547 | } |
1548 | } |
1549 | |
1550 | // CheckConstexprParameterTypes - Check whether a function's parameter types |
1551 | // are all literal types. If so, return true. If not, produce a suitable |
1552 | // diagnostic and return false. |
1553 | static bool CheckConstexprParameterTypes(Sema &SemaRef, |
1554 | const FunctionDecl *FD) { |
1555 | unsigned ArgIndex = 0; |
1556 | const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); |
1557 | for (FunctionProtoType::param_type_iterator i = FT->param_type_begin(), |
1558 | e = FT->param_type_end(); |
1559 | i != e; ++i, ++ArgIndex) { |
1560 | const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); |
1561 | SourceLocation ParamLoc = PD->getLocation(); |
1562 | if (!(*i)->isDependentType() && |
1563 | SemaRef.RequireLiteralType(ParamLoc, *i, |
1564 | diag::err_constexpr_non_literal_param, |
1565 | ArgIndex+1, PD->getSourceRange(), |
1566 | isa<CXXConstructorDecl>(FD))) |
1567 | return false; |
1568 | } |
1569 | return true; |
1570 | } |
1571 | |
1572 | /// Get diagnostic %select index for tag kind for |
1573 | /// record diagnostic message. |
1574 | /// WARNING: Indexes apply to particular diagnostics only! |
1575 | /// |
1576 | /// \returns diagnostic %select index. |
1577 | static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { |
1578 | switch (Tag) { |
1579 | case TTK_Struct: return 0; |
1580 | case TTK_Interface: return 1; |
1581 | case TTK_Class: return 2; |
1582 | default: llvm_unreachable("Invalid tag kind for record diagnostic!")::llvm::llvm_unreachable_internal("Invalid tag kind for record diagnostic!" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 1582); |
1583 | } |
1584 | } |
1585 | |
1586 | // CheckConstexprFunctionDecl - Check whether a function declaration satisfies |
1587 | // the requirements of a constexpr function definition or a constexpr |
1588 | // constructor definition. If so, return true. If not, produce appropriate |
1589 | // diagnostics and return false. |
1590 | // |
1591 | // This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. |
1592 | bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { |
1593 | const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); |
1594 | if (MD && MD->isInstance()) { |
1595 | // C++11 [dcl.constexpr]p4: |
1596 | // The definition of a constexpr constructor shall satisfy the following |
1597 | // constraints: |
1598 | // - the class shall not have any virtual base classes; |
1599 | const CXXRecordDecl *RD = MD->getParent(); |
1600 | if (RD->getNumVBases()) { |
1601 | Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) |
1602 | << isa<CXXConstructorDecl>(NewFD) |
1603 | << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); |
1604 | for (const auto &I : RD->vbases()) |
1605 | Diag(I.getBeginLoc(), diag::note_constexpr_virtual_base_here) |
1606 | << I.getSourceRange(); |
1607 | return false; |
1608 | } |
1609 | } |
1610 | |
1611 | if (!isa<CXXConstructorDecl>(NewFD)) { |
1612 | // C++11 [dcl.constexpr]p3: |
1613 | // The definition of a constexpr function shall satisfy the following |
1614 | // constraints: |
1615 | // - it shall not be virtual; |
1616 | const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); |
1617 | if (Method && Method->isVirtual()) { |
1618 | Method = Method->getCanonicalDecl(); |
1619 | Diag(Method->getLocation(), diag::err_constexpr_virtual); |
1620 | |
1621 | // If it's not obvious why this function is virtual, find an overridden |
1622 | // function which uses the 'virtual' keyword. |
1623 | const CXXMethodDecl *WrittenVirtual = Method; |
1624 | while (!WrittenVirtual->isVirtualAsWritten()) |
1625 | WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); |
1626 | if (WrittenVirtual != Method) |
1627 | Diag(WrittenVirtual->getLocation(), |
1628 | diag::note_overridden_virtual_function); |
1629 | return false; |
1630 | } |
1631 | |
1632 | // - its return type shall be a literal type; |
1633 | QualType RT = NewFD->getReturnType(); |
1634 | if (!RT->isDependentType() && |
1635 | RequireLiteralType(NewFD->getLocation(), RT, |
1636 | diag::err_constexpr_non_literal_return)) |
1637 | return false; |
1638 | } |
1639 | |
1640 | // - each of its parameter types shall be a literal type; |
1641 | if (!CheckConstexprParameterTypes(*this, NewFD)) |
1642 | return false; |
1643 | |
1644 | return true; |
1645 | } |
1646 | |
1647 | /// Check the given declaration statement is legal within a constexpr function |
1648 | /// body. C++11 [dcl.constexpr]p3,p4, and C++1y [dcl.constexpr]p3. |
1649 | /// |
1650 | /// \return true if the body is OK (maybe only as an extension), false if we |
1651 | /// have diagnosed a problem. |
1652 | static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, |
1653 | DeclStmt *DS, SourceLocation &Cxx1yLoc) { |
1654 | // C++11 [dcl.constexpr]p3 and p4: |
1655 | // The definition of a constexpr function(p3) or constructor(p4) [...] shall |
1656 | // contain only |
1657 | for (const auto *DclIt : DS->decls()) { |
1658 | switch (DclIt->getKind()) { |
1659 | case Decl::StaticAssert: |
1660 | case Decl::Using: |
1661 | case Decl::UsingShadow: |
1662 | case Decl::UsingDirective: |
1663 | case Decl::UnresolvedUsingTypename: |
1664 | case Decl::UnresolvedUsingValue: |
1665 | // - static_assert-declarations |
1666 | // - using-declarations, |
1667 | // - using-directives, |
1668 | continue; |
1669 | |
1670 | case Decl::Typedef: |
1671 | case Decl::TypeAlias: { |
1672 | // - typedef declarations and alias-declarations that do not define |
1673 | // classes or enumerations, |
1674 | const auto *TN = cast<TypedefNameDecl>(DclIt); |
1675 | if (TN->getUnderlyingType()->isVariablyModifiedType()) { |
1676 | // Don't allow variably-modified types in constexpr functions. |
1677 | TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); |
1678 | SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) |
1679 | << TL.getSourceRange() << TL.getType() |
1680 | << isa<CXXConstructorDecl>(Dcl); |
1681 | return false; |
1682 | } |
1683 | continue; |
1684 | } |
1685 | |
1686 | case Decl::Enum: |
1687 | case Decl::CXXRecord: |
1688 | // C++1y allows types to be defined, not just declared. |
1689 | if (cast<TagDecl>(DclIt)->isThisDeclarationADefinition()) |
1690 | SemaRef.Diag(DS->getBeginLoc(), |
1691 | SemaRef.getLangOpts().CPlusPlus14 |
1692 | ? diag::warn_cxx11_compat_constexpr_type_definition |
1693 | : diag::ext_constexpr_type_definition) |
1694 | << isa<CXXConstructorDecl>(Dcl); |
1695 | continue; |
1696 | |
1697 | case Decl::EnumConstant: |
1698 | case Decl::IndirectField: |
1699 | case Decl::ParmVar: |
1700 | // These can only appear with other declarations which are banned in |
1701 | // C++11 and permitted in C++1y, so ignore them. |
1702 | continue; |
1703 | |
1704 | case Decl::Var: |
1705 | case Decl::Decomposition: { |
1706 | // C++1y [dcl.constexpr]p3 allows anything except: |
1707 | // a definition of a variable of non-literal type or of static or |
1708 | // thread storage duration or for which no initialization is performed. |
1709 | const auto *VD = cast<VarDecl>(DclIt); |
1710 | if (VD->isThisDeclarationADefinition()) { |
1711 | if (VD->isStaticLocal()) { |
1712 | SemaRef.Diag(VD->getLocation(), |
1713 | diag::err_constexpr_local_var_static) |
1714 | << isa<CXXConstructorDecl>(Dcl) |
1715 | << (VD->getTLSKind() == VarDecl::TLS_Dynamic); |
1716 | return false; |
1717 | } |
1718 | if (!VD->getType()->isDependentType() && |
1719 | SemaRef.RequireLiteralType( |
1720 | VD->getLocation(), VD->getType(), |
1721 | diag::err_constexpr_local_var_non_literal_type, |
1722 | isa<CXXConstructorDecl>(Dcl))) |
1723 | return false; |
1724 | if (!VD->getType()->isDependentType() && |
1725 | !VD->hasInit() && !VD->isCXXForRangeDecl()) { |
1726 | SemaRef.Diag(VD->getLocation(), |
1727 | diag::err_constexpr_local_var_no_init) |
1728 | << isa<CXXConstructorDecl>(Dcl); |
1729 | return false; |
1730 | } |
1731 | } |
1732 | SemaRef.Diag(VD->getLocation(), |
1733 | SemaRef.getLangOpts().CPlusPlus14 |
1734 | ? diag::warn_cxx11_compat_constexpr_local_var |
1735 | : diag::ext_constexpr_local_var) |
1736 | << isa<CXXConstructorDecl>(Dcl); |
1737 | continue; |
1738 | } |
1739 | |
1740 | case Decl::NamespaceAlias: |
1741 | case Decl::Function: |
1742 | // These are disallowed in C++11 and permitted in C++1y. Allow them |
1743 | // everywhere as an extension. |
1744 | if (!Cxx1yLoc.isValid()) |
1745 | Cxx1yLoc = DS->getBeginLoc(); |
1746 | continue; |
1747 | |
1748 | default: |
1749 | SemaRef.Diag(DS->getBeginLoc(), diag::err_constexpr_body_invalid_stmt) |
1750 | << isa<CXXConstructorDecl>(Dcl); |
1751 | return false; |
1752 | } |
1753 | } |
1754 | |
1755 | return true; |
1756 | } |
1757 | |
1758 | /// Check that the given field is initialized within a constexpr constructor. |
1759 | /// |
1760 | /// \param Dcl The constexpr constructor being checked. |
1761 | /// \param Field The field being checked. This may be a member of an anonymous |
1762 | /// struct or union nested within the class being checked. |
1763 | /// \param Inits All declarations, including anonymous struct/union members and |
1764 | /// indirect members, for which any initialization was provided. |
1765 | /// \param Diagnosed Set to true if an error is produced. |
1766 | static void CheckConstexprCtorInitializer(Sema &SemaRef, |
1767 | const FunctionDecl *Dcl, |
1768 | FieldDecl *Field, |
1769 | llvm::SmallSet<Decl*, 16> &Inits, |
1770 | bool &Diagnosed) { |
1771 | if (Field->isInvalidDecl()) |
1772 | return; |
1773 | |
1774 | if (Field->isUnnamedBitfield()) |
1775 | return; |
1776 | |
1777 | // Anonymous unions with no variant members and empty anonymous structs do not |
1778 | // need to be explicitly initialized. FIXME: Anonymous structs that contain no |
1779 | // indirect fields don't need initializing. |
1780 | if (Field->isAnonymousStructOrUnion() && |
1781 | (Field->getType()->isUnionType() |
1782 | ? !Field->getType()->getAsCXXRecordDecl()->hasVariantMembers() |
1783 | : Field->getType()->getAsCXXRecordDecl()->isEmpty())) |
1784 | return; |
1785 | |
1786 | if (!Inits.count(Field)) { |
1787 | if (!Diagnosed) { |
1788 | SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); |
1789 | Diagnosed = true; |
1790 | } |
1791 | SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); |
1792 | } else if (Field->isAnonymousStructOrUnion()) { |
1793 | const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); |
1794 | for (auto *I : RD->fields()) |
1795 | // If an anonymous union contains an anonymous struct of which any member |
1796 | // is initialized, all members must be initialized. |
1797 | if (!RD->isUnion() || Inits.count(I)) |
1798 | CheckConstexprCtorInitializer(SemaRef, Dcl, I, Inits, Diagnosed); |
1799 | } |
1800 | } |
1801 | |
1802 | /// Check the provided statement is allowed in a constexpr function |
1803 | /// definition. |
1804 | static bool |
1805 | CheckConstexprFunctionStmt(Sema &SemaRef, const FunctionDecl *Dcl, Stmt *S, |
1806 | SmallVectorImpl<SourceLocation> &ReturnStmts, |
1807 | SourceLocation &Cxx1yLoc, SourceLocation &Cxx2aLoc) { |
1808 | // - its function-body shall be [...] a compound-statement that contains only |
1809 | switch (S->getStmtClass()) { |
1810 | case Stmt::NullStmtClass: |
1811 | // - null statements, |
1812 | return true; |
1813 | |
1814 | case Stmt::DeclStmtClass: |
1815 | // - static_assert-declarations |
1816 | // - using-declarations, |
1817 | // - using-directives, |
1818 | // - typedef declarations and alias-declarations that do not define |
1819 | // classes or enumerations, |
1820 | if (!CheckConstexprDeclStmt(SemaRef, Dcl, cast<DeclStmt>(S), Cxx1yLoc)) |
1821 | return false; |
1822 | return true; |
1823 | |
1824 | case Stmt::ReturnStmtClass: |
1825 | // - and exactly one return statement; |
1826 | if (isa<CXXConstructorDecl>(Dcl)) { |
1827 | // C++1y allows return statements in constexpr constructors. |
1828 | if (!Cxx1yLoc.isValid()) |
1829 | Cxx1yLoc = S->getBeginLoc(); |
1830 | return true; |
1831 | } |
1832 | |
1833 | ReturnStmts.push_back(S->getBeginLoc()); |
1834 | return true; |
1835 | |
1836 | case Stmt::CompoundStmtClass: { |
1837 | // C++1y allows compound-statements. |
1838 | if (!Cxx1yLoc.isValid()) |
1839 | Cxx1yLoc = S->getBeginLoc(); |
1840 | |
1841 | CompoundStmt *CompStmt = cast<CompoundStmt>(S); |
1842 | for (auto *BodyIt : CompStmt->body()) { |
1843 | if (!CheckConstexprFunctionStmt(SemaRef, Dcl, BodyIt, ReturnStmts, |
1844 | Cxx1yLoc, Cxx2aLoc)) |
1845 | return false; |
1846 | } |
1847 | return true; |
1848 | } |
1849 | |
1850 | case Stmt::AttributedStmtClass: |
1851 | if (!Cxx1yLoc.isValid()) |
1852 | Cxx1yLoc = S->getBeginLoc(); |
1853 | return true; |
1854 | |
1855 | case Stmt::IfStmtClass: { |
1856 | // C++1y allows if-statements. |
1857 | if (!Cxx1yLoc.isValid()) |
1858 | Cxx1yLoc = S->getBeginLoc(); |
1859 | |
1860 | IfStmt *If = cast<IfStmt>(S); |
1861 | if (!CheckConstexprFunctionStmt(SemaRef, Dcl, If->getThen(), ReturnStmts, |
1862 | Cxx1yLoc, Cxx2aLoc)) |
1863 | return false; |
1864 | if (If->getElse() && |
1865 | !CheckConstexprFunctionStmt(SemaRef, Dcl, If->getElse(), ReturnStmts, |
1866 | Cxx1yLoc, Cxx2aLoc)) |
1867 | return false; |
1868 | return true; |
1869 | } |
1870 | |
1871 | case Stmt::WhileStmtClass: |
1872 | case Stmt::DoStmtClass: |
1873 | case Stmt::ForStmtClass: |
1874 | case Stmt::CXXForRangeStmtClass: |
1875 | case Stmt::ContinueStmtClass: |
1876 | // C++1y allows all of these. We don't allow them as extensions in C++11, |
1877 | // because they don't make sense without variable mutation. |
1878 | if (!SemaRef.getLangOpts().CPlusPlus14) |
1879 | break; |
1880 | if (!Cxx1yLoc.isValid()) |
1881 | Cxx1yLoc = S->getBeginLoc(); |
1882 | for (Stmt *SubStmt : S->children()) |
1883 | if (SubStmt && |
1884 | !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts, |
1885 | Cxx1yLoc, Cxx2aLoc)) |
1886 | return false; |
1887 | return true; |
1888 | |
1889 | case Stmt::SwitchStmtClass: |
1890 | case Stmt::CaseStmtClass: |
1891 | case Stmt::DefaultStmtClass: |
1892 | case Stmt::BreakStmtClass: |
1893 | // C++1y allows switch-statements, and since they don't need variable |
1894 | // mutation, we can reasonably allow them in C++11 as an extension. |
1895 | if (!Cxx1yLoc.isValid()) |
1896 | Cxx1yLoc = S->getBeginLoc(); |
1897 | for (Stmt *SubStmt : S->children()) |
1898 | if (SubStmt && |
1899 | !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts, |
1900 | Cxx1yLoc, Cxx2aLoc)) |
1901 | return false; |
1902 | return true; |
1903 | |
1904 | case Stmt::CXXTryStmtClass: |
1905 | if (Cxx2aLoc.isInvalid()) |
1906 | Cxx2aLoc = S->getBeginLoc(); |
1907 | for (Stmt *SubStmt : S->children()) { |
1908 | if (SubStmt && |
1909 | !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts, |
1910 | Cxx1yLoc, Cxx2aLoc)) |
1911 | return false; |
1912 | } |
1913 | return true; |
1914 | |
1915 | case Stmt::CXXCatchStmtClass: |
1916 | // Do not bother checking the language mode (already covered by the |
1917 | // try block check). |
1918 | if (!CheckConstexprFunctionStmt(SemaRef, Dcl, |
1919 | cast<CXXCatchStmt>(S)->getHandlerBlock(), |
1920 | ReturnStmts, Cxx1yLoc, Cxx2aLoc)) |
1921 | return false; |
1922 | return true; |
1923 | |
1924 | default: |
1925 | if (!isa<Expr>(S)) |
1926 | break; |
1927 | |
1928 | // C++1y allows expression-statements. |
1929 | if (!Cxx1yLoc.isValid()) |
1930 | Cxx1yLoc = S->getBeginLoc(); |
1931 | return true; |
1932 | } |
1933 | |
1934 | SemaRef.Diag(S->getBeginLoc(), diag::err_constexpr_body_invalid_stmt) |
1935 | << isa<CXXConstructorDecl>(Dcl); |
1936 | return false; |
1937 | } |
1938 | |
1939 | /// Check the body for the given constexpr function declaration only contains |
1940 | /// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. |
1941 | /// |
1942 | /// \return true if the body is OK, false if we have diagnosed a problem. |
1943 | bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { |
1944 | SmallVector<SourceLocation, 4> ReturnStmts; |
1945 | |
1946 | if (isa<CXXTryStmt>(Body)) { |
1947 | // C++11 [dcl.constexpr]p3: |
1948 | // The definition of a constexpr function shall satisfy the following |
1949 | // constraints: [...] |
1950 | // - its function-body shall be = delete, = default, or a |
1951 | // compound-statement |
1952 | // |
1953 | // C++11 [dcl.constexpr]p4: |
1954 | // In the definition of a constexpr constructor, [...] |
1955 | // - its function-body shall not be a function-try-block; |
1956 | // |
1957 | // This restriction is lifted in C++2a, as long as inner statements also |
1958 | // apply the general constexpr rules. |
1959 | Diag(Body->getBeginLoc(), |
1960 | !getLangOpts().CPlusPlus2a |
1961 | ? diag::ext_constexpr_function_try_block_cxx2a |
1962 | : diag::warn_cxx17_compat_constexpr_function_try_block) |
1963 | << isa<CXXConstructorDecl>(Dcl); |
1964 | } |
1965 | |
1966 | // - its function-body shall be [...] a compound-statement that contains only |
1967 | // [... list of cases ...] |
1968 | // |
1969 | // Note that walking the children here is enough to properly check for |
1970 | // CompoundStmt and CXXTryStmt body. |
1971 | SourceLocation Cxx1yLoc, Cxx2aLoc; |
1972 | for (Stmt *SubStmt : Body->children()) { |
1973 | if (SubStmt && |
1974 | !CheckConstexprFunctionStmt(*this, Dcl, SubStmt, ReturnStmts, |
1975 | Cxx1yLoc, Cxx2aLoc)) |
1976 | return false; |
1977 | } |
1978 | |
1979 | if (Cxx2aLoc.isValid()) |
1980 | Diag(Cxx2aLoc, |
1981 | getLangOpts().CPlusPlus2a |
1982 | ? diag::warn_cxx17_compat_constexpr_body_invalid_stmt |
1983 | : diag::ext_constexpr_body_invalid_stmt_cxx2a) |
1984 | << isa<CXXConstructorDecl>(Dcl); |
1985 | if (Cxx1yLoc.isValid()) |
1986 | Diag(Cxx1yLoc, |
1987 | getLangOpts().CPlusPlus14 |
1988 | ? diag::warn_cxx11_compat_constexpr_body_invalid_stmt |
1989 | : diag::ext_constexpr_body_invalid_stmt) |
1990 | << isa<CXXConstructorDecl>(Dcl); |
1991 | |
1992 | if (const CXXConstructorDecl *Constructor |
1993 | = dyn_cast<CXXConstructorDecl>(Dcl)) { |
1994 | const CXXRecordDecl *RD = Constructor->getParent(); |
1995 | // DR1359: |
1996 | // - every non-variant non-static data member and base class sub-object |
1997 | // shall be initialized; |
1998 | // DR1460: |
1999 | // - if the class is a union having variant members, exactly one of them |
2000 | // shall be initialized; |
2001 | if (RD->isUnion()) { |
2002 | if (Constructor->getNumCtorInitializers() == 0 && |
2003 | RD->hasVariantMembers()) { |
2004 | Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); |
2005 | return false; |
2006 | } |
2007 | } else if (!Constructor->isDependentContext() && |
2008 | !Constructor->isDelegatingConstructor()) { |
2009 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 2009, __PRETTY_FUNCTION__)); |
2010 | |
2011 | // Skip detailed checking if we have enough initializers, and we would |
2012 | // allow at most one initializer per member. |
2013 | bool AnyAnonStructUnionMembers = false; |
2014 | unsigned Fields = 0; |
2015 | for (CXXRecordDecl::field_iterator I = RD->field_begin(), |
2016 | E = RD->field_end(); I != E; ++I, ++Fields) { |
2017 | if (I->isAnonymousStructOrUnion()) { |
2018 | AnyAnonStructUnionMembers = true; |
2019 | break; |
2020 | } |
2021 | } |
2022 | // DR1460: |
2023 | // - if the class is a union-like class, but is not a union, for each of |
2024 | // its anonymous union members having variant members, exactly one of |
2025 | // them shall be initialized; |
2026 | if (AnyAnonStructUnionMembers || |
2027 | Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { |
2028 | // Check initialization of non-static data members. Base classes are |
2029 | // always initialized so do not need to be checked. Dependent bases |
2030 | // might not have initializers in the member initializer list. |
2031 | llvm::SmallSet<Decl*, 16> Inits; |
2032 | for (const auto *I: Constructor->inits()) { |
2033 | if (FieldDecl *FD = I->getMember()) |
2034 | Inits.insert(FD); |
2035 | else if (IndirectFieldDecl *ID = I->getIndirectMember()) |
2036 | Inits.insert(ID->chain_begin(), ID->chain_end()); |
2037 | } |
2038 | |
2039 | bool Diagnosed = false; |
2040 | for (auto *I : RD->fields()) |
2041 | CheckConstexprCtorInitializer(*this, Dcl, I, Inits, Diagnosed); |
2042 | if (Diagnosed) |
2043 | return false; |
2044 | } |
2045 | } |
2046 | } else { |
2047 | if (ReturnStmts.empty()) { |
2048 | // C++1y doesn't require constexpr functions to contain a 'return' |
2049 | // statement. We still do, unless the return type might be void, because |
2050 | // otherwise if there's no return statement, the function cannot |
2051 | // be used in a core constant expression. |
2052 | bool OK = getLangOpts().CPlusPlus14 && |
2053 | (Dcl->getReturnType()->isVoidType() || |
2054 | Dcl->getReturnType()->isDependentType()); |
2055 | Diag(Dcl->getLocation(), |
2056 | OK ? diag::warn_cxx11_compat_constexpr_body_no_return |
2057 | : diag::err_constexpr_body_no_return); |
2058 | if (!OK) |
2059 | return false; |
2060 | } else if (ReturnStmts.size() > 1) { |
2061 | Diag(ReturnStmts.back(), |
2062 | getLangOpts().CPlusPlus14 |
2063 | ? diag::warn_cxx11_compat_constexpr_body_multiple_return |
2064 | : diag::ext_constexpr_body_multiple_return); |
2065 | for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) |
2066 | Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); |
2067 | } |
2068 | } |
2069 | |
2070 | // C++11 [dcl.constexpr]p5: |
2071 | // if no function argument values exist such that the function invocation |
2072 | // substitution would produce a constant expression, the program is |
2073 | // ill-formed; no diagnostic required. |
2074 | // C++11 [dcl.constexpr]p3: |
2075 | // - every constructor call and implicit conversion used in initializing the |
2076 | // return value shall be one of those allowed in a constant expression. |
2077 | // C++11 [dcl.constexpr]p4: |
2078 | // - every constructor involved in initializing non-static data members and |
2079 | // base class sub-objects shall be a constexpr constructor. |
2080 | SmallVector<PartialDiagnosticAt, 8> Diags; |
2081 | if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { |
2082 | Diag(Dcl->getLocation(), diag::ext_constexpr_function_never_constant_expr) |
2083 | << isa<CXXConstructorDecl>(Dcl); |
2084 | for (size_t I = 0, N = Diags.size(); I != N; ++I) |
2085 | Diag(Diags[I].first, Diags[I].second); |
2086 | // Don't return false here: we allow this for compatibility in |
2087 | // system headers. |
2088 | } |
2089 | |
2090 | return true; |
2091 | } |
2092 | |
2093 | /// Get the class that is directly named by the current context. This is the |
2094 | /// class for which an unqualified-id in this scope could name a constructor |
2095 | /// or destructor. |
2096 | /// |
2097 | /// If the scope specifier denotes a class, this will be that class. |
2098 | /// If the scope specifier is empty, this will be the class whose |
2099 | /// member-specification we are currently within. Otherwise, there |
2100 | /// is no such class. |
2101 | CXXRecordDecl *Sema::getCurrentClass(Scope *, const CXXScopeSpec *SS) { |
2102 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 2102, __PRETTY_FUNCTION__)); |
2103 | |
2104 | if (SS && SS->isInvalid()) |
2105 | return nullptr; |
2106 | |
2107 | if (SS && SS->isNotEmpty()) { |
2108 | DeclContext *DC = computeDeclContext(*SS, true); |
2109 | return dyn_cast_or_null<CXXRecordDecl>(DC); |
2110 | } |
2111 | |
2112 | return dyn_cast_or_null<CXXRecordDecl>(CurContext); |
2113 | } |
2114 | |
2115 | /// isCurrentClassName - Determine whether the identifier II is the |
2116 | /// name of the class type currently being defined. In the case of |
2117 | /// nested classes, this will only return true if II is the name of |
2118 | /// the innermost class. |
2119 | bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *S, |
2120 | const CXXScopeSpec *SS) { |
2121 | CXXRecordDecl *CurDecl = getCurrentClass(S, SS); |
2122 | return CurDecl && &II == CurDecl->getIdentifier(); |
2123 | } |
2124 | |
2125 | /// Determine whether the identifier II is a typo for the name of |
2126 | /// the class type currently being defined. If so, update it to the identifier |
2127 | /// that should have been used. |
2128 | bool Sema::isCurrentClassNameTypo(IdentifierInfo *&II, const CXXScopeSpec *SS) { |
2129 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 2129, __PRETTY_FUNCTION__)); |
2130 | |
2131 | if (!getLangOpts().SpellChecking) |
2132 | return false; |
2133 | |
2134 | CXXRecordDecl *CurDecl; |
2135 | if (SS && SS->isSet() && !SS->isInvalid()) { |
2136 | DeclContext *DC = computeDeclContext(*SS, true); |
2137 | CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); |
2138 | } else |
2139 | CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); |
2140 | |
2141 | if (CurDecl && CurDecl->getIdentifier() && II != CurDecl->getIdentifier() && |
2142 | 3 * II->getName().edit_distance(CurDecl->getIdentifier()->getName()) |
2143 | < II->getLength()) { |
2144 | II = CurDecl->getIdentifier(); |
2145 | return true; |
2146 | } |
2147 | |
2148 | return false; |
2149 | } |
2150 | |
2151 | /// Determine whether the given class is a base class of the given |
2152 | /// class, including looking at dependent bases. |
2153 | static bool findCircularInheritance(const CXXRecordDecl *Class, |
2154 | const CXXRecordDecl *Current) { |
2155 | SmallVector<const CXXRecordDecl*, 8> Queue; |
2156 | |
2157 | Class = Class->getCanonicalDecl(); |
2158 | while (true) { |
2159 | for (const auto &I : Current->bases()) { |
2160 | CXXRecordDecl *Base = I.getType()->getAsCXXRecordDecl(); |
2161 | if (!Base) |
2162 | continue; |
2163 | |
2164 | Base = Base->getDefinition(); |
2165 | if (!Base) |
2166 | continue; |
2167 | |
2168 | if (Base->getCanonicalDecl() == Class) |
2169 | return true; |
2170 | |
2171 | Queue.push_back(Base); |
2172 | } |
2173 | |
2174 | if (Queue.empty()) |
2175 | return false; |
2176 | |
2177 | Current = Queue.pop_back_val(); |
2178 | } |
2179 | |
2180 | return false; |
2181 | } |
2182 | |
2183 | /// Check the validity of a C++ base class specifier. |
2184 | /// |
2185 | /// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics |
2186 | /// and returns NULL otherwise. |
2187 | CXXBaseSpecifier * |
2188 | Sema::CheckBaseSpecifier(CXXRecordDecl *Class, |
2189 | SourceRange SpecifierRange, |
2190 | bool Virtual, AccessSpecifier Access, |
2191 | TypeSourceInfo *TInfo, |
2192 | SourceLocation EllipsisLoc) { |
2193 | QualType BaseType = TInfo->getType(); |
2194 | |
2195 | // C++ [class.union]p1: |
2196 | // A union shall not have base classes. |
2197 | if (Class->isUnion()) { |
2198 | Diag(Class->getLocation(), diag::err_base_clause_on_union) |
2199 | << SpecifierRange; |
2200 | return nullptr; |
2201 | } |
2202 | |
2203 | if (EllipsisLoc.isValid() && |
2204 | !TInfo->getType()->containsUnexpandedParameterPack()) { |
2205 | Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) |
2206 | << TInfo->getTypeLoc().getSourceRange(); |
2207 | EllipsisLoc = SourceLocation(); |
2208 | } |
2209 | |
2210 | SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); |
2211 | |
2212 | if (BaseType->isDependentType()) { |
2213 | // Make sure that we don't have circular inheritance among our dependent |
2214 | // bases. For non-dependent bases, the check for completeness below handles |
2215 | // this. |
2216 | if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { |
2217 | if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || |
2218 | ((BaseDecl = BaseDecl->getDefinition()) && |
2219 | findCircularInheritance(Class, BaseDecl))) { |
2220 | Diag(BaseLoc, diag::err_circular_inheritance) |
2221 | << BaseType << Context.getTypeDeclType(Class); |
2222 | |
2223 | if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) |
2224 | Diag(BaseDecl->getLocation(), diag::note_previous_decl) |
2225 | << BaseType; |
2226 | |
2227 | return nullptr; |
2228 | } |
2229 | } |
2230 | |
2231 | return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, |
2232 | Class->getTagKind() == TTK_Class, |
2233 | Access, TInfo, EllipsisLoc); |
2234 | } |
2235 | |
2236 | // Base specifiers must be record types. |
2237 | if (!BaseType->isRecordType()) { |
2238 | Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; |
2239 | return nullptr; |
2240 | } |
2241 | |
2242 | // C++ [class.union]p1: |
2243 | // A union shall not be used as a base class. |
2244 | if (BaseType->isUnionType()) { |
2245 | Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; |
2246 | return nullptr; |
2247 | } |
2248 | |
2249 | // For the MS ABI, propagate DLL attributes to base class templates. |
2250 | if (Context.getTargetInfo().getCXXABI().isMicrosoft()) { |
2251 | if (Attr *ClassAttr = getDLLAttr(Class)) { |
2252 | if (auto *BaseTemplate = dyn_cast_or_null<ClassTemplateSpecializationDecl>( |
2253 | BaseType->getAsCXXRecordDecl())) { |
2254 | propagateDLLAttrToBaseClassTemplate(Class, ClassAttr, BaseTemplate, |
2255 | BaseLoc); |
2256 | } |
2257 | } |
2258 | } |
2259 | |
2260 | // C++ [class.derived]p2: |
2261 | // The class-name in a base-specifier shall not be an incompletely |
2262 | // defined class. |
2263 | if (RequireCompleteType(BaseLoc, BaseType, |
2264 | diag::err_incomplete_base_class, SpecifierRange)) { |
2265 | Class->setInvalidDecl(); |
2266 | return nullptr; |
2267 | } |
2268 | |
2269 | // If the base class is polymorphic or isn't empty, the new one is/isn't, too. |
2270 | RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); |
2271 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 2271, __PRETTY_FUNCTION__)); |
2272 | BaseDecl = BaseDecl->getDefinition(); |
2273 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 2273, __PRETTY_FUNCTION__)); |
2274 | CXXRecordDecl *CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); |
2275 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 2275, __PRETTY_FUNCTION__)); |
2276 | |
2277 | // Microsoft docs say: |
2278 | // "If a base-class has a code_seg attribute, derived classes must have the |
2279 | // same attribute." |
2280 | const auto *BaseCSA = CXXBaseDecl->getAttr<CodeSegAttr>(); |
2281 | const auto *DerivedCSA = Class->getAttr<CodeSegAttr>(); |
2282 | if ((DerivedCSA || BaseCSA) && |
2283 | (!BaseCSA || !DerivedCSA || BaseCSA->getName() != DerivedCSA->getName())) { |
2284 | Diag(Class->getLocation(), diag::err_mismatched_code_seg_base); |
2285 | Diag(CXXBaseDecl->getLocation(), diag::note_base_class_specified_here) |
2286 | << CXXBaseDecl; |
2287 | return nullptr; |
2288 | } |
2289 | |
2290 | // A class which contains a flexible array member is not suitable for use as a |
2291 | // base class: |
2292 | // - If the layout determines that a base comes before another base, |
2293 | // the flexible array member would index into the subsequent base. |
2294 | // - If the layout determines that base comes before the derived class, |
2295 | // the flexible array member would index into the derived class. |
2296 | if (CXXBaseDecl->hasFlexibleArrayMember()) { |
2297 | Diag(BaseLoc, diag::err_base_class_has_flexible_array_member) |
2298 | << CXXBaseDecl->getDeclName(); |
2299 | return nullptr; |
2300 | } |
2301 | |
2302 | // C++ [class]p3: |
2303 | // If a class is marked final and it appears as a base-type-specifier in |
2304 | // base-clause, the program is ill-formed. |
2305 | if (FinalAttr *FA = CXXBaseDecl->getAttr<FinalAttr>()) { |
2306 | Diag(BaseLoc, diag::err_class_marked_final_used_as_base) |
2307 | << CXXBaseDecl->getDeclName() |
2308 | << FA->isSpelledAsSealed(); |
2309 | Diag(CXXBaseDecl->getLocation(), diag::note_entity_declared_at) |
2310 | << CXXBaseDecl->getDeclName() << FA->getRange(); |
2311 | return nullptr; |
2312 | } |
2313 | |
2314 | if (BaseDecl->isInvalidDecl()) |
2315 | Class->setInvalidDecl(); |
2316 | |
2317 | // Create the base specifier. |
2318 | return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, |
2319 | Class->getTagKind() == TTK_Class, |
2320 | Access, TInfo, EllipsisLoc); |
2321 | } |
2322 | |
2323 | /// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is |
2324 | /// one entry in the base class list of a class specifier, for |
2325 | /// example: |
2326 | /// class foo : public bar, virtual private baz { |
2327 | /// 'public bar' and 'virtual private baz' are each base-specifiers. |
2328 | BaseResult |
2329 | Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, |
2330 | ParsedAttributes &Attributes, |
2331 | bool Virtual, AccessSpecifier Access, |
2332 | ParsedType basetype, SourceLocation BaseLoc, |
2333 | SourceLocation EllipsisLoc) { |
2334 | if (!classdecl) |
2335 | return true; |
2336 | |
2337 | AdjustDeclIfTemplate(classdecl); |
2338 | CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); |
2339 | if (!Class) |
2340 | return true; |
2341 | |
2342 | // We haven't yet attached the base specifiers. |
2343 | Class->setIsParsingBaseSpecifiers(); |
2344 | |
2345 | // We do not support any C++11 attributes on base-specifiers yet. |
2346 | // Diagnose any attributes we see. |
2347 | for (const ParsedAttr &AL : Attributes) { |
2348 | if (AL.isInvalid() || AL.getKind() == ParsedAttr::IgnoredAttribute) |
2349 | continue; |
2350 | Diag(AL.getLoc(), AL.getKind() == ParsedAttr::UnknownAttribute |
2351 | ? (unsigned)diag::warn_unknown_attribute_ignored |
2352 | : (unsigned)diag::err_base_specifier_attribute) |
2353 | << AL.getName(); |
2354 | } |
2355 | |
2356 | TypeSourceInfo *TInfo = nullptr; |
2357 | GetTypeFromParser(basetype, &TInfo); |
2358 | |
2359 | if (EllipsisLoc.isInvalid() && |
2360 | DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, |
2361 | UPPC_BaseType)) |
2362 | return true; |
2363 | |
2364 | if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, |
2365 | Virtual, Access, TInfo, |
2366 | EllipsisLoc)) |
2367 | return BaseSpec; |
2368 | else |
2369 | Class->setInvalidDecl(); |
2370 | |
2371 | return true; |
2372 | } |
2373 | |
2374 | /// Use small set to collect indirect bases. As this is only used |
2375 | /// locally, there's no need to abstract the small size parameter. |
2376 | typedef llvm::SmallPtrSet<QualType, 4> IndirectBaseSet; |
2377 | |
2378 | /// Recursively add the bases of Type. Don't add Type itself. |
2379 | static void |
2380 | NoteIndirectBases(ASTContext &Context, IndirectBaseSet &Set, |
2381 | const QualType &Type) |
2382 | { |
2383 | // Even though the incoming type is a base, it might not be |
2384 | // a class -- it could be a template parm, for instance. |
2385 | if (auto Rec = Type->getAs<RecordType>()) { |
2386 | auto Decl = Rec->getAsCXXRecordDecl(); |
2387 | |
2388 | // Iterate over its bases. |
2389 | for (const auto &BaseSpec : Decl->bases()) { |
2390 | QualType Base = Context.getCanonicalType(BaseSpec.getType()) |
2391 | .getUnqualifiedType(); |
2392 | if (Set.insert(Base).second) |
2393 | // If we've not already seen it, recurse. |
2394 | NoteIndirectBases(Context, Set, Base); |
2395 | } |
2396 | } |
2397 | } |
2398 | |
2399 | /// Performs the actual work of attaching the given base class |
2400 | /// specifiers to a C++ class. |
2401 | bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, |
2402 | MutableArrayRef<CXXBaseSpecifier *> Bases) { |
2403 | if (Bases.empty()) |
2404 | return false; |
2405 | |
2406 | // Used to keep track of which base types we have already seen, so |
2407 | // that we can properly diagnose redundant direct base types. Note |
2408 | // that the key is always the unqualified canonical type of the base |
2409 | // class. |
2410 | std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; |
2411 | |
2412 | // Used to track indirect bases so we can see if a direct base is |
2413 | // ambiguous. |
2414 | IndirectBaseSet IndirectBaseTypes; |
2415 | |
2416 | // Copy non-redundant base specifiers into permanent storage. |
2417 | unsigned NumGoodBases = 0; |
2418 | bool Invalid = false; |
2419 | for (unsigned idx = 0; idx < Bases.size(); ++idx) { |
2420 | QualType NewBaseType |
2421 | = Context.getCanonicalType(Bases[idx]->getType()); |
2422 | NewBaseType = NewBaseType.getLocalUnqualifiedType(); |
2423 | |
2424 | CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; |
2425 | if (KnownBase) { |
2426 | // C++ [class.mi]p3: |
2427 | // A class shall not be specified as a direct base class of a |
2428 | // derived class more than once. |
2429 | Diag(Bases[idx]->getBeginLoc(), diag::err_duplicate_base_class) |
2430 | << KnownBase->getType() << Bases[idx]->getSourceRange(); |
2431 | |
2432 | // Delete the duplicate base class specifier; we're going to |
2433 | // overwrite its pointer later. |
2434 | Context.Deallocate(Bases[idx]); |
2435 | |
2436 | Invalid = true; |
2437 | } else { |
2438 | // Okay, add this new base class. |
2439 | KnownBase = Bases[idx]; |
2440 | Bases[NumGoodBases++] = Bases[idx]; |
2441 | |
2442 | // Note this base's direct & indirect bases, if there could be ambiguity. |
2443 | if (Bases.size() > 1) |
2444 | NoteIndirectBases(Context, IndirectBaseTypes, NewBaseType); |
2445 | |
2446 | if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { |
2447 | const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); |
2448 | if (Class->isInterface() && |
2449 | (!RD->isInterfaceLike() || |
2450 | KnownBase->getAccessSpecifier() != AS_public)) { |
2451 | // The Microsoft extension __interface does not permit bases that |
2452 | // are not themselves public interfaces. |
2453 | Diag(KnownBase->getBeginLoc(), diag::err_invalid_base_in_interface) |
2454 | << getRecordDiagFromTagKind(RD->getTagKind()) << RD |
2455 | << RD->getSourceRange(); |
2456 | Invalid = true; |
2457 | } |
2458 | if (RD->hasAttr<WeakAttr>()) |
2459 | Class->addAttr(WeakAttr::CreateImplicit(Context)); |
2460 | } |
2461 | } |
2462 | } |
2463 | |
2464 | // Attach the remaining base class specifiers to the derived class. |
2465 | Class->setBases(Bases.data(), NumGoodBases); |
2466 | |
2467 | // Check that the only base classes that are duplicate are virtual. |
2468 | for (unsigned idx = 0; idx < NumGoodBases; ++idx) { |
2469 | // Check whether this direct base is inaccessible due to ambiguity. |
2470 | QualType BaseType = Bases[idx]->getType(); |
2471 | |
2472 | // Skip all dependent types in templates being used as base specifiers. |
2473 | // Checks below assume that the base specifier is a CXXRecord. |
2474 | if (BaseType->isDependentType()) |
2475 | continue; |
2476 | |
2477 | CanQualType CanonicalBase = Context.getCanonicalType(BaseType) |
2478 | .getUnqualifiedType(); |
2479 | |
2480 | if (IndirectBaseTypes.count(CanonicalBase)) { |
2481 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, |
2482 | /*DetectVirtual=*/true); |
2483 | bool found |
2484 | = Class->isDerivedFrom(CanonicalBase->getAsCXXRecordDecl(), Paths); |
2485 | assert(found)((found) ? static_cast<void> (0) : __assert_fail ("found" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 2485, __PRETTY_FUNCTION__)); |
2486 | (void)found; |
2487 | |
2488 | if (Paths.isAmbiguous(CanonicalBase)) |
2489 | Diag(Bases[idx]->getBeginLoc(), diag::warn_inaccessible_base_class) |
2490 | << BaseType << getAmbiguousPathsDisplayString(Paths) |
2491 | << Bases[idx]->getSourceRange(); |
2492 | else |
2493 | assert(Bases[idx]->isVirtual())((Bases[idx]->isVirtual()) ? static_cast<void> (0) : __assert_fail ("Bases[idx]->isVirtual()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 2493, __PRETTY_FUNCTION__)); |
2494 | } |
2495 | |
2496 | // Delete the base class specifier, since its data has been copied |
2497 | // into the CXXRecordDecl. |
2498 | Context.Deallocate(Bases[idx]); |
2499 | } |
2500 | |
2501 | return Invalid; |
2502 | } |
2503 | |
2504 | /// ActOnBaseSpecifiers - Attach the given base specifiers to the |
2505 | /// class, after checking whether there are any duplicate base |
2506 | /// classes. |
2507 | void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, |
2508 | MutableArrayRef<CXXBaseSpecifier *> Bases) { |
2509 | if (!ClassDecl || Bases.empty()) |
2510 | return; |
2511 | |
2512 | AdjustDeclIfTemplate(ClassDecl); |
2513 | AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), Bases); |
2514 | } |
2515 | |
2516 | /// Determine whether the type \p Derived is a C++ class that is |
2517 | /// derived from the type \p Base. |
2518 | bool Sema::IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base) { |
2519 | if (!getLangOpts().CPlusPlus) |
2520 | return false; |
2521 | |
2522 | CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); |
2523 | if (!DerivedRD) |
2524 | return false; |
2525 | |
2526 | CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); |
2527 | if (!BaseRD) |
2528 | return false; |
2529 | |
2530 | // If either the base or the derived type is invalid, don't try to |
2531 | // check whether one is derived from the other. |
2532 | if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl()) |
2533 | return false; |
2534 | |
2535 | // FIXME: In a modules build, do we need the entire path to be visible for us |
2536 | // to be able to use the inheritance relationship? |
2537 | if (!isCompleteType(Loc, Derived) && !DerivedRD->isBeingDefined()) |
2538 | return false; |
2539 | |
2540 | return DerivedRD->isDerivedFrom(BaseRD); |
2541 | } |
2542 | |
2543 | /// Determine whether the type \p Derived is a C++ class that is |
2544 | /// derived from the type \p Base. |
2545 | bool Sema::IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base, |
2546 | CXXBasePaths &Paths) { |
2547 | if (!getLangOpts().CPlusPlus) |
2548 | return false; |
2549 | |
2550 | CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); |
2551 | if (!DerivedRD) |
2552 | return false; |
2553 | |
2554 | CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); |
2555 | if (!BaseRD) |
2556 | return false; |
2557 | |
2558 | if (!isCompleteType(Loc, Derived) && !DerivedRD->isBeingDefined()) |
2559 | return false; |
2560 | |
2561 | return DerivedRD->isDerivedFrom(BaseRD, Paths); |
2562 | } |
2563 | |
2564 | static void BuildBasePathArray(const CXXBasePath &Path, |
2565 | CXXCastPath &BasePathArray) { |
2566 | // We first go backward and check if we have a virtual base. |
2567 | // FIXME: It would be better if CXXBasePath had the base specifier for |
2568 | // the nearest virtual base. |
2569 | unsigned Start = 0; |
2570 | for (unsigned I = Path.size(); I != 0; --I) { |
2571 | if (Path[I - 1].Base->isVirtual()) { |
2572 | Start = I - 1; |
2573 | break; |
2574 | } |
2575 | } |
2576 | |
2577 | // Now add all bases. |
2578 | for (unsigned I = Start, E = Path.size(); I != E; ++I) |
2579 | BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); |
2580 | } |
2581 | |
2582 | |
2583 | void Sema::BuildBasePathArray(const CXXBasePaths &Paths, |
2584 | CXXCastPath &BasePathArray) { |
2585 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 2585, __PRETTY_FUNCTION__)); |
2586 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 2586, __PRETTY_FUNCTION__)); |
2587 | return ::BuildBasePathArray(Paths.front(), BasePathArray); |
2588 | } |
2589 | /// CheckDerivedToBaseConversion - Check whether the Derived-to-Base |
2590 | /// conversion (where Derived and Base are class types) is |
2591 | /// well-formed, meaning that the conversion is unambiguous (and |
2592 | /// that all of the base classes are accessible). Returns true |
2593 | /// and emits a diagnostic if the code is ill-formed, returns false |
2594 | /// otherwise. Loc is the location where this routine should point to |
2595 | /// if there is an error, and Range is the source range to highlight |
2596 | /// if there is an error. |
2597 | /// |
2598 | /// If either InaccessibleBaseID or AmbigiousBaseConvID are 0, then the |
2599 | /// diagnostic for the respective type of error will be suppressed, but the |
2600 | /// check for ill-formed code will still be performed. |
2601 | bool |
2602 | Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, |
2603 | unsigned InaccessibleBaseID, |
2604 | unsigned AmbigiousBaseConvID, |
2605 | SourceLocation Loc, SourceRange Range, |
2606 | DeclarationName Name, |
2607 | CXXCastPath *BasePath, |
2608 | bool IgnoreAccess) { |
2609 | // First, determine whether the path from Derived to Base is |
2610 | // ambiguous. This is slightly more expensive than checking whether |
2611 | // the Derived to Base conversion exists, because here we need to |
2612 | // explore multiple paths to determine if there is an ambiguity. |
2613 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, |
2614 | /*DetectVirtual=*/false); |
2615 | bool DerivationOkay = IsDerivedFrom(Loc, Derived, Base, Paths); |
2616 | if (!DerivationOkay) |
2617 | return true; |
2618 | |
2619 | const CXXBasePath *Path = nullptr; |
2620 | if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) |
2621 | Path = &Paths.front(); |
2622 | |
2623 | // For MSVC compatibility, check if Derived directly inherits from Base. Clang |
2624 | // warns about this hierarchy under -Winaccessible-base, but MSVC allows the |
2625 | // user to access such bases. |
2626 | if (!Path && getLangOpts().MSVCCompat) { |
2627 | for (const CXXBasePath &PossiblePath : Paths) { |
2628 | if (PossiblePath.size() == 1) { |
2629 | Path = &PossiblePath; |
2630 | if (AmbigiousBaseConvID) |
2631 | Diag(Loc, diag::ext_ms_ambiguous_direct_base) |
2632 | << Base << Derived << Range; |
2633 | break; |
2634 | } |
2635 | } |
2636 | } |
2637 | |
2638 | if (Path) { |
2639 | if (!IgnoreAccess) { |
2640 | // Check that the base class can be accessed. |
2641 | switch ( |
2642 | CheckBaseClassAccess(Loc, Base, Derived, *Path, InaccessibleBaseID)) { |
2643 | case AR_inaccessible: |
2644 | return true; |
2645 | case AR_accessible: |
2646 | case AR_dependent: |
2647 | case AR_delayed: |
2648 | break; |
2649 | } |
2650 | } |
2651 | |
2652 | // Build a base path if necessary. |
2653 | if (BasePath) |
2654 | ::BuildBasePathArray(*Path, *BasePath); |
2655 | return false; |
2656 | } |
2657 | |
2658 | if (AmbigiousBaseConvID) { |
2659 | // We know that the derived-to-base conversion is ambiguous, and |
2660 | // we're going to produce a diagnostic. Perform the derived-to-base |
2661 | // search just one more time to compute all of the possible paths so |
2662 | // that we can print them out. This is more expensive than any of |
2663 | // the previous derived-to-base checks we've done, but at this point |
2664 | // performance isn't as much of an issue. |
2665 | Paths.clear(); |
2666 | Paths.setRecordingPaths(true); |
2667 | bool StillOkay = IsDerivedFrom(Loc, Derived, Base, Paths); |
2668 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 2668, __PRETTY_FUNCTION__)); |
2669 | (void)StillOkay; |
2670 | |
2671 | // Build up a textual representation of the ambiguous paths, e.g., |
2672 | // D -> B -> A, that will be used to illustrate the ambiguous |
2673 | // conversions in the diagnostic. We only print one of the paths |
2674 | // to each base class subobject. |
2675 | std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); |
2676 | |
2677 | Diag(Loc, AmbigiousBaseConvID) |
2678 | << Derived << Base << PathDisplayStr << Range << Name; |
2679 | } |
2680 | return true; |
2681 | } |
2682 | |
2683 | bool |
2684 | Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, |
2685 | SourceLocation Loc, SourceRange Range, |
2686 | CXXCastPath *BasePath, |
2687 | bool IgnoreAccess) { |
2688 | return CheckDerivedToBaseConversion( |
2689 | Derived, Base, diag::err_upcast_to_inaccessible_base, |
2690 | diag::err_ambiguous_derived_to_base_conv, Loc, Range, DeclarationName(), |
2691 | BasePath, IgnoreAccess); |
2692 | } |
2693 | |
2694 | |
2695 | /// Builds a string representing ambiguous paths from a |
2696 | /// specific derived class to different subobjects of the same base |
2697 | /// class. |
2698 | /// |
2699 | /// This function builds a string that can be used in error messages |
2700 | /// to show the different paths that one can take through the |
2701 | /// inheritance hierarchy to go from the derived class to different |
2702 | /// subobjects of a base class. The result looks something like this: |
2703 | /// @code |
2704 | /// struct D -> struct B -> struct A |
2705 | /// struct D -> struct C -> struct A |
2706 | /// @endcode |
2707 | std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { |
2708 | std::string PathDisplayStr; |
2709 | std::set<unsigned> DisplayedPaths; |
2710 | for (CXXBasePaths::paths_iterator Path = Paths.begin(); |
2711 | Path != Paths.end(); ++Path) { |
2712 | if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { |
2713 | // We haven't displayed a path to this particular base |
2714 | // class subobject yet. |
2715 | PathDisplayStr += "\n "; |
2716 | PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); |
2717 | for (CXXBasePath::const_iterator Element = Path->begin(); |
2718 | Element != Path->end(); ++Element) |
2719 | PathDisplayStr += " -> " + Element->Base->getType().getAsString(); |
2720 | } |
2721 | } |
2722 | |
2723 | return PathDisplayStr; |
2724 | } |
2725 | |
2726 | //===----------------------------------------------------------------------===// |
2727 | // C++ class member Handling |
2728 | //===----------------------------------------------------------------------===// |
2729 | |
2730 | /// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. |
2731 | bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, SourceLocation ASLoc, |
2732 | SourceLocation ColonLoc, |
2733 | const ParsedAttributesView &Attrs) { |
2734 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 2734, __PRETTY_FUNCTION__)); |
2735 | AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, |
2736 | ASLoc, ColonLoc); |
2737 | CurContext->addHiddenDecl(ASDecl); |
2738 | return ProcessAccessDeclAttributeList(ASDecl, Attrs); |
2739 | } |
2740 | |
2741 | /// CheckOverrideControl - Check C++11 override control semantics. |
2742 | void Sema::CheckOverrideControl(NamedDecl *D) { |
2743 | if (D->isInvalidDecl()) |
2744 | return; |
2745 | |
2746 | // We only care about "override" and "final" declarations. |
2747 | if (!D->hasAttr<OverrideAttr>() && !D->hasAttr<FinalAttr>()) |
2748 | return; |
2749 | |
2750 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); |
2751 | |
2752 | // We can't check dependent instance methods. |
2753 | if (MD && MD->isInstance() && |
2754 | (MD->getParent()->hasAnyDependentBases() || |
2755 | MD->getType()->isDependentType())) |
2756 | return; |
2757 | |
2758 | if (MD && !MD->isVirtual()) { |
2759 | // If we have a non-virtual method, check if if hides a virtual method. |
2760 | // (In that case, it's most likely the method has the wrong type.) |
2761 | SmallVector<CXXMethodDecl *, 8> OverloadedMethods; |
2762 | FindHiddenVirtualMethods(MD, OverloadedMethods); |
2763 | |
2764 | if (!OverloadedMethods.empty()) { |
2765 | if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { |
2766 | Diag(OA->getLocation(), |
2767 | diag::override_keyword_hides_virtual_member_function) |
2768 | << "override" << (OverloadedMethods.size() > 1); |
2769 | } else if (FinalAttr *FA = D->getAttr<FinalAttr>()) { |
2770 | Diag(FA->getLocation(), |
2771 | diag::override_keyword_hides_virtual_member_function) |
2772 | << (FA->isSpelledAsSealed() ? "sealed" : "final") |
2773 | << (OverloadedMethods.size() > 1); |
2774 | } |
2775 | NoteHiddenVirtualMethods(MD, OverloadedMethods); |
2776 | MD->setInvalidDecl(); |
2777 | return; |
2778 | } |
2779 | // Fall through into the general case diagnostic. |
2780 | // FIXME: We might want to attempt typo correction here. |
2781 | } |
2782 | |
2783 | if (!MD || !MD->isVirtual()) { |
2784 | if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { |
2785 | Diag(OA->getLocation(), |
2786 | diag::override_keyword_only_allowed_on_virtual_member_functions) |
2787 | << "override" << FixItHint::CreateRemoval(OA->getLocation()); |
2788 | D->dropAttr<OverrideAttr>(); |
2789 | } |
2790 | if (FinalAttr *FA = D->getAttr<FinalAttr>()) { |
2791 | Diag(FA->getLocation(), |
2792 | diag::override_keyword_only_allowed_on_virtual_member_functions) |
2793 | << (FA->isSpelledAsSealed() ? "sealed" : "final") |
2794 | << FixItHint::CreateRemoval(FA->getLocation()); |
2795 | D->dropAttr<FinalAttr>(); |
2796 | } |
2797 | return; |
2798 | } |
2799 | |
2800 | // C++11 [class.virtual]p5: |
2801 | // If a function is marked with the virt-specifier override and |
2802 | // does not override a member function of a base class, the program is |
2803 | // ill-formed. |
2804 | bool HasOverriddenMethods = MD->size_overridden_methods() != 0; |
2805 | if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) |
2806 | Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) |
2807 | << MD->getDeclName(); |
2808 | } |
2809 | |
2810 | void Sema::DiagnoseAbsenceOfOverrideControl(NamedDecl *D) { |
2811 | if (D->isInvalidDecl() || D->hasAttr<OverrideAttr>()) |
2812 | return; |
2813 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); |
2814 | if (!MD || MD->isImplicit() || MD->hasAttr<FinalAttr>()) |
2815 | return; |
2816 | |
2817 | SourceLocation Loc = MD->getLocation(); |
2818 | SourceLocation SpellingLoc = Loc; |
2819 | if (getSourceManager().isMacroArgExpansion(Loc)) |
2820 | SpellingLoc = getSourceManager().getImmediateExpansionRange(Loc).getBegin(); |
2821 | SpellingLoc = getSourceManager().getSpellingLoc(SpellingLoc); |
2822 | if (SpellingLoc.isValid() && getSourceManager().isInSystemHeader(SpellingLoc)) |
2823 | return; |
2824 | |
2825 | if (MD->size_overridden_methods() > 0) { |
2826 | unsigned DiagID = isa<CXXDestructorDecl>(MD) |
2827 | ? diag::warn_destructor_marked_not_override_overriding |
2828 | : diag::warn_function_marked_not_override_overriding; |
2829 | Diag(MD->getLocation(), DiagID) << MD->getDeclName(); |
2830 | const CXXMethodDecl *OMD = *MD->begin_overridden_methods(); |
2831 | Diag(OMD->getLocation(), diag::note_overridden_virtual_function); |
2832 | } |
2833 | } |
2834 | |
2835 | /// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member |
2836 | /// function overrides a virtual member function marked 'final', according to |
2837 | /// C++11 [class.virtual]p4. |
2838 | bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, |
2839 | const CXXMethodDecl *Old) { |
2840 | FinalAttr *FA = Old->getAttr<FinalAttr>(); |
2841 | if (!FA) |
2842 | return false; |
2843 | |
2844 | Diag(New->getLocation(), diag::err_final_function_overridden) |
2845 | << New->getDeclName() |
2846 | << FA->isSpelledAsSealed(); |
2847 | Diag(Old->getLocation(), diag::note_overridden_virtual_function); |
2848 | return true; |
2849 | } |
2850 | |
2851 | static bool InitializationHasSideEffects(const FieldDecl &FD) { |
2852 | const Type *T = FD.getType()->getBaseElementTypeUnsafe(); |
2853 | // FIXME: Destruction of ObjC lifetime types has side-effects. |
2854 | if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) |
2855 | return !RD->isCompleteDefinition() || |
2856 | !RD->hasTrivialDefaultConstructor() || |
2857 | !RD->hasTrivialDestructor(); |
2858 | return false; |
2859 | } |
2860 | |
2861 | static const ParsedAttr *getMSPropertyAttr(const ParsedAttributesView &list) { |
2862 | ParsedAttributesView::const_iterator Itr = |
2863 | llvm::find_if(list, [](const ParsedAttr &AL) { |
2864 | return AL.isDeclspecPropertyAttribute(); |
2865 | }); |
2866 | if (Itr != list.end()) |
2867 | return &*Itr; |
2868 | return nullptr; |
2869 | } |
2870 | |
2871 | // Check if there is a field shadowing. |
2872 | void Sema::CheckShadowInheritedFields(const SourceLocation &Loc, |
2873 | DeclarationName FieldName, |
2874 | const CXXRecordDecl *RD, |
2875 | bool DeclIsField) { |
2876 | if (Diags.isIgnored(diag::warn_shadow_field, Loc)) |
2877 | return; |
2878 | |
2879 | // To record a shadowed field in a base |
2880 | std::map<CXXRecordDecl*, NamedDecl*> Bases; |
2881 | auto FieldShadowed = [&](const CXXBaseSpecifier *Specifier, |
2882 | CXXBasePath &Path) { |
2883 | const auto Base = Specifier->getType()->getAsCXXRecordDecl(); |
2884 | // Record an ambiguous path directly |
2885 | if (Bases.find(Base) != Bases.end()) |
2886 | return true; |
2887 | for (const auto Field : Base->lookup(FieldName)) { |
2888 | if ((isa<FieldDecl>(Field) || isa<IndirectFieldDecl>(Field)) && |
2889 | Field->getAccess() != AS_private) { |
2890 | assert(Field->getAccess() != AS_none)((Field->getAccess() != AS_none) ? static_cast<void> (0) : __assert_fail ("Field->getAccess() != AS_none", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 2890, __PRETTY_FUNCTION__)); |
2891 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 2891, __PRETTY_FUNCTION__)); |
2892 | Bases[Base] = Field; |
2893 | return true; |
2894 | } |
2895 | } |
2896 | return false; |
2897 | }; |
2898 | |
2899 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, |
2900 | /*DetectVirtual=*/true); |
2901 | if (!RD->lookupInBases(FieldShadowed, Paths)) |
2902 | return; |
2903 | |
2904 | for (const auto &P : Paths) { |
2905 | auto Base = P.back().Base->getType()->getAsCXXRecordDecl(); |
2906 | auto It = Bases.find(Base); |
2907 | // Skip duplicated bases |
2908 | if (It == Bases.end()) |
2909 | continue; |
2910 | auto BaseField = It->second; |
2911 | assert(BaseField->getAccess() != AS_private)((BaseField->getAccess() != AS_private) ? static_cast<void > (0) : __assert_fail ("BaseField->getAccess() != AS_private" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 2911, __PRETTY_FUNCTION__)); |
2912 | if (AS_none != |
2913 | CXXRecordDecl::MergeAccess(P.Access, BaseField->getAccess())) { |
2914 | Diag(Loc, diag::warn_shadow_field) |
2915 | << FieldName << RD << Base << DeclIsField; |
2916 | Diag(BaseField->getLocation(), diag::note_shadow_field); |
2917 | Bases.erase(It); |
2918 | } |
2919 | } |
2920 | } |
2921 | |
2922 | /// ActOnCXXMemberDeclarator - This is invoked when a C++ class member |
2923 | /// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the |
2924 | /// bitfield width if there is one, 'InitExpr' specifies the initializer if |
2925 | /// one has been parsed, and 'InitStyle' is set if an in-class initializer is |
2926 | /// present (but parsing it has been deferred). |
2927 | NamedDecl * |
2928 | Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, |
2929 | MultiTemplateParamsArg TemplateParameterLists, |
2930 | Expr *BW, const VirtSpecifiers &VS, |
2931 | InClassInitStyle InitStyle) { |
2932 | const DeclSpec &DS = D.getDeclSpec(); |
2933 | DeclarationNameInfo NameInfo = GetNameForDeclarator(D); |
2934 | DeclarationName Name = NameInfo.getName(); |
2935 | SourceLocation Loc = NameInfo.getLoc(); |
2936 | |
2937 | // For anonymous bitfields, the location should point to the type. |
2938 | if (Loc.isInvalid()) |
2939 | Loc = D.getBeginLoc(); |
2940 | |
2941 | Expr *BitWidth = static_cast<Expr*>(BW); |
2942 | |
2943 | assert(isa<CXXRecordDecl>(CurContext))((isa<CXXRecordDecl>(CurContext)) ? static_cast<void > (0) : __assert_fail ("isa<CXXRecordDecl>(CurContext)" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 2943, __PRETTY_FUNCTION__)); |
2944 | assert(!DS.isFriendSpecified())((!DS.isFriendSpecified()) ? static_cast<void> (0) : __assert_fail ("!DS.isFriendSpecified()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 2944, __PRETTY_FUNCTION__)); |
2945 | |
2946 | bool isFunc = D.isDeclarationOfFunction(); |
2947 | const ParsedAttr *MSPropertyAttr = |
2948 | getMSPropertyAttr(D.getDeclSpec().getAttributes()); |
2949 | |
2950 | if (cast<CXXRecordDecl>(CurContext)->isInterface()) { |
2951 | // The Microsoft extension __interface only permits public member functions |
2952 | // and prohibits constructors, destructors, operators, non-public member |
2953 | // functions, static methods and data members. |
2954 | unsigned InvalidDecl; |
2955 | bool ShowDeclName = true; |
2956 | if (!isFunc && |
2957 | (DS.getStorageClassSpec() == DeclSpec::SCS_typedef || MSPropertyAttr)) |
2958 | InvalidDecl = 0; |
2959 | else if (!isFunc) |
2960 | InvalidDecl = 1; |
2961 | else if (AS != AS_public) |
2962 | InvalidDecl = 2; |
2963 | else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) |
2964 | InvalidDecl = 3; |
2965 | else switch (Name.getNameKind()) { |
2966 | case DeclarationName::CXXConstructorName: |
2967 | InvalidDecl = 4; |
2968 | ShowDeclName = false; |
2969 | break; |
2970 | |
2971 | case DeclarationName::CXXDestructorName: |
2972 | InvalidDecl = 5; |
2973 | ShowDeclName = false; |
2974 | break; |
2975 | |
2976 | case DeclarationName::CXXOperatorName: |
2977 | case DeclarationName::CXXConversionFunctionName: |
2978 | InvalidDecl = 6; |
2979 | break; |
2980 | |
2981 | default: |
2982 | InvalidDecl = 0; |
2983 | break; |
2984 | } |
2985 | |
2986 | if (InvalidDecl) { |
2987 | if (ShowDeclName) |
2988 | Diag(Loc, diag::err_invalid_member_in_interface) |
2989 | << (InvalidDecl-1) << Name; |
2990 | else |
2991 | Diag(Loc, diag::err_invalid_member_in_interface) |
2992 | << (InvalidDecl-1) << ""; |
2993 | return nullptr; |
2994 | } |
2995 | } |
2996 | |
2997 | // C++ 9.2p6: A member shall not be declared to have automatic storage |
2998 | // duration (auto, register) or with the extern storage-class-specifier. |
2999 | // C++ 7.1.1p8: The mutable specifier can be applied only to names of class |
3000 | // data members and cannot be applied to names declared const or static, |
3001 | // and cannot be applied to reference members. |
3002 | switch (DS.getStorageClassSpec()) { |
3003 | case DeclSpec::SCS_unspecified: |
3004 | case DeclSpec::SCS_typedef: |
3005 | case DeclSpec::SCS_static: |
3006 | break; |
3007 | case DeclSpec::SCS_mutable: |
3008 | if (isFunc) { |
3009 | Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); |
3010 | |
3011 | // FIXME: It would be nicer if the keyword was ignored only for this |
3012 | // declarator. Otherwise we could get follow-up errors. |
3013 | D.getMutableDeclSpec().ClearStorageClassSpecs(); |
3014 | } |
3015 | break; |
3016 | default: |
3017 | Diag(DS.getStorageClassSpecLoc(), |
3018 | diag::err_storageclass_invalid_for_member); |
3019 | D.getMutableDeclSpec().ClearStorageClassSpecs(); |
3020 | break; |
3021 | } |
3022 | |
3023 | bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || |
3024 | DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && |
3025 | !isFunc); |
3026 | |
3027 | if (DS.isConstexprSpecified() && isInstField) { |
3028 | SemaDiagnosticBuilder B = |
3029 | Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member); |
3030 | SourceLocation ConstexprLoc = DS.getConstexprSpecLoc(); |
3031 | if (InitStyle == ICIS_NoInit) { |
3032 | B << 0 << 0; |
3033 | if (D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) |
3034 | B << FixItHint::CreateRemoval(ConstexprLoc); |
3035 | else { |
3036 | B << FixItHint::CreateReplacement(ConstexprLoc, "const"); |
3037 | D.getMutableDeclSpec().ClearConstexprSpec(); |
3038 | const char *PrevSpec; |
3039 | unsigned DiagID; |
3040 | bool Failed = D.getMutableDeclSpec().SetTypeQual( |
3041 | DeclSpec::TQ_const, ConstexprLoc, PrevSpec, DiagID, getLangOpts()); |
3042 | (void)Failed; |
3043 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 3043, __PRETTY_FUNCTION__)); |
3044 | } |
3045 | } else { |
3046 | B << 1; |
3047 | const char *PrevSpec; |
3048 | unsigned DiagID; |
3049 | if (D.getMutableDeclSpec().SetStorageClassSpec( |
3050 | *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID, |
3051 | Context.getPrintingPolicy())) { |
3052 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 3053, __PRETTY_FUNCTION__)) |
3053 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 3053, __PRETTY_FUNCTION__)); |
3054 | B << 1; |
3055 | } else { |
3056 | B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static "); |
3057 | isInstField = false; |
3058 | } |
3059 | } |
3060 | } |
3061 | |
3062 | NamedDecl *Member; |
3063 | if (isInstField) { |
3064 | CXXScopeSpec &SS = D.getCXXScopeSpec(); |
3065 | |
3066 | // Data members must have identifiers for names. |
3067 | if (!Name.isIdentifier()) { |
3068 | Diag(Loc, diag::err_bad_variable_name) |
3069 | << Name; |
3070 | return nullptr; |
3071 | } |
3072 | |
3073 | IdentifierInfo *II = Name.getAsIdentifierInfo(); |
3074 | |
3075 | // Member field could not be with "template" keyword. |
3076 | // So TemplateParameterLists should be empty in this case. |
3077 | if (TemplateParameterLists.size()) { |
3078 | TemplateParameterList* TemplateParams = TemplateParameterLists[0]; |
3079 | if (TemplateParams->size()) { |
3080 | // There is no such thing as a member field template. |
3081 | Diag(D.getIdentifierLoc(), diag::err_template_member) |
3082 | << II |
3083 | << SourceRange(TemplateParams->getTemplateLoc(), |
3084 | TemplateParams->getRAngleLoc()); |
3085 | } else { |
3086 | // There is an extraneous 'template<>' for this member. |
3087 | Diag(TemplateParams->getTemplateLoc(), |
3088 | diag::err_template_member_noparams) |
3089 | << II |
3090 | << SourceRange(TemplateParams->getTemplateLoc(), |
3091 | TemplateParams->getRAngleLoc()); |
3092 | } |
3093 | return nullptr; |
3094 | } |
3095 | |
3096 | if (SS.isSet() && !SS.isInvalid()) { |
3097 | // The user provided a superfluous scope specifier inside a class |
3098 | // definition: |
3099 | // |
3100 | // class X { |
3101 | // int X::member; |
3102 | // }; |
3103 | if (DeclContext *DC = computeDeclContext(SS, false)) |
3104 | diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc(), |
3105 | D.getName().getKind() == |
3106 | UnqualifiedIdKind::IK_TemplateId); |
3107 | else |
3108 | Diag(D.getIdentifierLoc(), diag::err_member_qualification) |
3109 | << Name << SS.getRange(); |
3110 | |
3111 | SS.clear(); |
3112 | } |
3113 | |
3114 | if (MSPropertyAttr) { |
3115 | Member = HandleMSProperty(S, cast<CXXRecordDecl>(CurContext), Loc, D, |
3116 | BitWidth, InitStyle, AS, *MSPropertyAttr); |
3117 | if (!Member) |
3118 | return nullptr; |
3119 | isInstField = false; |
3120 | } else { |
3121 | Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, |
3122 | BitWidth, InitStyle, AS); |
3123 | if (!Member) |
3124 | return nullptr; |
3125 | } |
3126 | |
3127 | CheckShadowInheritedFields(Loc, Name, cast<CXXRecordDecl>(CurContext)); |
3128 | } else { |
3129 | Member = HandleDeclarator(S, D, TemplateParameterLists); |
3130 | if (!Member) |
3131 | return nullptr; |
3132 | |
3133 | // Non-instance-fields can't have a bitfield. |
3134 | if (BitWidth) { |
3135 | if (Member->isInvalidDecl()) { |
3136 | // don't emit another diagnostic. |
3137 | } else if (isa<VarDecl>(Member) || isa<VarTemplateDecl>(Member)) { |
3138 | // C++ 9.6p3: A bit-field shall not be a static member. |
3139 | // "static member 'A' cannot be a bit-field" |
3140 | Diag(Loc, diag::err_static_not_bitfield) |
3141 | << Name << BitWidth->getSourceRange(); |
3142 | } else if (isa<TypedefDecl>(Member)) { |
3143 | // "typedef member 'x' cannot be a bit-field" |
3144 | Diag(Loc, diag::err_typedef_not_bitfield) |
3145 | << Name << BitWidth->getSourceRange(); |
3146 | } else { |
3147 | // A function typedef ("typedef int f(); f a;"). |
3148 | // C++ 9.6p3: A bit-field shall have integral or enumeration type. |
3149 | Diag(Loc, diag::err_not_integral_type_bitfield) |
3150 | << Name << cast<ValueDecl>(Member)->getType() |
3151 | << BitWidth->getSourceRange(); |
3152 | } |
3153 | |
3154 | BitWidth = nullptr; |
3155 | Member->setInvalidDecl(); |
3156 | } |
3157 | |
3158 | NamedDecl *NonTemplateMember = Member; |
3159 | if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) |
3160 | NonTemplateMember = FunTmpl->getTemplatedDecl(); |
3161 | else if (VarTemplateDecl *VarTmpl = dyn_cast<VarTemplateDecl>(Member)) |
3162 | NonTemplateMember = VarTmpl->getTemplatedDecl(); |
3163 | |
3164 | Member->setAccess(AS); |
3165 | |
3166 | // If we have declared a member function template or static data member |
3167 | // template, set the access of the templated declaration as well. |
3168 | if (NonTemplateMember != Member) |
3169 | NonTemplateMember->setAccess(AS); |
3170 | |
3171 | // C++ [temp.deduct.guide]p3: |
3172 | // A deduction guide [...] for a member class template [shall be |
3173 | // declared] with the same access [as the template]. |
3174 | if (auto *DG = dyn_cast<CXXDeductionGuideDecl>(NonTemplateMember)) { |
3175 | auto *TD = DG->getDeducedTemplate(); |
3176 | // Access specifiers are only meaningful if both the template and the |
3177 | // deduction guide are from the same scope. |
3178 | if (AS != TD->getAccess() && |
3179 | TD->getDeclContext()->getRedeclContext()->Equals( |
3180 | DG->getDeclContext()->getRedeclContext())) { |
3181 | Diag(DG->getBeginLoc(), diag::err_deduction_guide_wrong_access); |
3182 | Diag(TD->getBeginLoc(), diag::note_deduction_guide_template_access) |
3183 | << TD->getAccess(); |
3184 | const AccessSpecDecl *LastAccessSpec = nullptr; |
3185 | for (const auto *D : cast<CXXRecordDecl>(CurContext)->decls()) { |
3186 | if (const auto *AccessSpec = dyn_cast<AccessSpecDecl>(D)) |
3187 | LastAccessSpec = AccessSpec; |
3188 | } |
3189 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 3189, __PRETTY_FUNCTION__)); |
3190 | Diag(LastAccessSpec->getBeginLoc(), diag::note_deduction_guide_access) |
3191 | << AS; |
3192 | } |
3193 | } |
3194 | } |
3195 | |
3196 | if (VS.isOverrideSpecified()) |
3197 | Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context, 0)); |
3198 | if (VS.isFinalSpecified()) |
3199 | Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context, |
3200 | VS.isFinalSpelledSealed())); |
3201 | |
3202 | if (VS.getLastLocation().isValid()) { |
3203 | // Update the end location of a method that has a virt-specifiers. |
3204 | if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) |
3205 | MD->setRangeEnd(VS.getLastLocation()); |
3206 | } |
3207 | |
3208 | CheckOverrideControl(Member); |
3209 | |
3210 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 3210, __PRETTY_FUNCTION__)); |
3211 | |
3212 | if (isInstField) { |
3213 | FieldDecl *FD = cast<FieldDecl>(Member); |
3214 | FieldCollector->Add(FD); |
3215 | |
3216 | if (!Diags.isIgnored(diag::warn_unused_private_field, FD->getLocation())) { |
3217 | // Remember all explicit private FieldDecls that have a name, no side |
3218 | // effects and are not part of a dependent type declaration. |
3219 | if (!FD->isImplicit() && FD->getDeclName() && |
3220 | FD->getAccess() == AS_private && |
3221 | !FD->hasAttr<UnusedAttr>() && |
3222 | !FD->getParent()->isDependentContext() && |
3223 | !InitializationHasSideEffects(*FD)) |
3224 | UnusedPrivateFields.insert(FD); |
3225 | } |
3226 | } |
3227 | |
3228 | return Member; |
3229 | } |
3230 | |
3231 | namespace { |
3232 | class UninitializedFieldVisitor |
3233 | : public EvaluatedExprVisitor<UninitializedFieldVisitor> { |
3234 | Sema &S; |
3235 | // List of Decls to generate a warning on. Also remove Decls that become |
3236 | // initialized. |
3237 | llvm::SmallPtrSetImpl<ValueDecl*> &Decls; |
3238 | // List of base classes of the record. Classes are removed after their |
3239 | // initializers. |
3240 | llvm::SmallPtrSetImpl<QualType> &BaseClasses; |
3241 | // Vector of decls to be removed from the Decl set prior to visiting the |
3242 | // nodes. These Decls may have been initialized in the prior initializer. |
3243 | llvm::SmallVector<ValueDecl*, 4> DeclsToRemove; |
3244 | // If non-null, add a note to the warning pointing back to the constructor. |
3245 | const CXXConstructorDecl *Constructor; |
3246 | // Variables to hold state when processing an initializer list. When |
3247 | // InitList is true, special case initialization of FieldDecls matching |
3248 | // InitListFieldDecl. |
3249 | bool InitList; |
3250 | FieldDecl *InitListFieldDecl; |
3251 | llvm::SmallVector<unsigned, 4> InitFieldIndex; |
3252 | |
3253 | public: |
3254 | typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; |
3255 | UninitializedFieldVisitor(Sema &S, |
3256 | llvm::SmallPtrSetImpl<ValueDecl*> &Decls, |
3257 | llvm::SmallPtrSetImpl<QualType> &BaseClasses) |
3258 | : Inherited(S.Context), S(S), Decls(Decls), BaseClasses(BaseClasses), |
3259 | Constructor(nullptr), InitList(false), InitListFieldDecl(nullptr) {} |
3260 | |
3261 | // Returns true if the use of ME is not an uninitialized use. |
3262 | bool IsInitListMemberExprInitialized(MemberExpr *ME, |
3263 | bool CheckReferenceOnly) { |
3264 | llvm::SmallVector<FieldDecl*, 4> Fields; |
3265 | bool ReferenceField = false; |
3266 | while (ME) { |
3267 | FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl()); |
3268 | if (!FD) |
3269 | return false; |
3270 | Fields.push_back(FD); |
3271 | if (FD->getType()->isReferenceType()) |
3272 | ReferenceField = true; |
3273 | ME = dyn_cast<MemberExpr>(ME->getBase()->IgnoreParenImpCasts()); |
3274 | } |
3275 | |
3276 | // Binding a reference to an uninitialized field is not an |
3277 | // uninitialized use. |
3278 | if (CheckReferenceOnly && !ReferenceField) |
3279 | return true; |
3280 | |
3281 | llvm::SmallVector<unsigned, 4> UsedFieldIndex; |
3282 | // Discard the first field since it is the field decl that is being |
3283 | // initialized. |
3284 | for (auto I = Fields.rbegin() + 1, E = Fields.rend(); I != E; ++I) { |
3285 | UsedFieldIndex.push_back((*I)->getFieldIndex()); |
3286 | } |
3287 | |
3288 | for (auto UsedIter = UsedFieldIndex.begin(), |
3289 | UsedEnd = UsedFieldIndex.end(), |
3290 | OrigIter = InitFieldIndex.begin(), |
3291 | OrigEnd = InitFieldIndex.end(); |
3292 | UsedIter != UsedEnd && OrigIter != OrigEnd; ++UsedIter, ++OrigIter) { |
3293 | if (*UsedIter < *OrigIter) |
3294 | return true; |
3295 | if (*UsedIter > *OrigIter) |
3296 | break; |
3297 | } |
3298 | |
3299 | return false; |
3300 | } |
3301 | |
3302 | void HandleMemberExpr(MemberExpr *ME, bool CheckReferenceOnly, |
3303 | bool AddressOf) { |
3304 | if (isa<EnumConstantDecl>(ME->getMemberDecl())) |
3305 | return; |
3306 | |
3307 | // FieldME is the inner-most MemberExpr that is not an anonymous struct |
3308 | // or union. |
3309 | MemberExpr *FieldME = ME; |
3310 | |
3311 | bool AllPODFields = FieldME->getType().isPODType(S.Context); |
3312 | |
3313 | Expr *Base = ME; |
3314 | while (MemberExpr *SubME = |
3315 | dyn_cast<MemberExpr>(Base->IgnoreParenImpCasts())) { |
3316 | |
3317 | if (isa<VarDecl>(SubME->getMemberDecl())) |
3318 | return; |
3319 | |
3320 | if (FieldDecl *FD = dyn_cast<FieldDecl>(SubME->getMemberDecl())) |
3321 | if (!FD->isAnonymousStructOrUnion()) |
3322 | FieldME = SubME; |
3323 | |
3324 | if (!FieldME->getType().isPODType(S.Context)) |
3325 | AllPODFields = false; |
3326 | |
3327 | Base = SubME->getBase(); |
3328 | } |
3329 | |
3330 | if (!isa<CXXThisExpr>(Base->IgnoreParenImpCasts())) |
3331 | return; |
3332 | |
3333 | if (AddressOf && AllPODFields) |
3334 | return; |
3335 | |
3336 | ValueDecl* FoundVD = FieldME->getMemberDecl(); |
3337 | |
3338 | if (ImplicitCastExpr *BaseCast = dyn_cast<ImplicitCastExpr>(Base)) { |
3339 | while (isa<ImplicitCastExpr>(BaseCast->getSubExpr())) { |
3340 | BaseCast = cast<ImplicitCastExpr>(BaseCast->getSubExpr()); |
3341 | } |
3342 | |
3343 | if (BaseCast->getCastKind() == CK_UncheckedDerivedToBase) { |
3344 | QualType T = BaseCast->getType(); |
3345 | if (T->isPointerType() && |
3346 | BaseClasses.count(T->getPointeeType())) { |
3347 | S.Diag(FieldME->getExprLoc(), diag::warn_base_class_is_uninit) |
3348 | << T->getPointeeType() << FoundVD; |
3349 | } |
3350 | } |
3351 | } |
3352 | |
3353 | if (!Decls.count(FoundVD)) |
3354 | return; |
3355 | |
3356 | const bool IsReference = FoundVD->getType()->isReferenceType(); |
3357 | |
3358 | if (InitList && !AddressOf && FoundVD == InitListFieldDecl) { |
3359 | // Special checking for initializer lists. |
3360 | if (IsInitListMemberExprInitialized(ME, CheckReferenceOnly)) { |
3361 | return; |
3362 | } |
3363 | } else { |
3364 | // Prevent double warnings on use of unbounded references. |
3365 | if (CheckReferenceOnly && !IsReference) |
3366 | return; |
3367 | } |
3368 | |
3369 | unsigned diag = IsReference |
3370 | ? diag::warn_reference_field_is_uninit |
3371 | : diag::warn_field_is_uninit; |
3372 | S.Diag(FieldME->getExprLoc(), diag) << FoundVD; |
3373 | if (Constructor) |
3374 | S.Diag(Constructor->getLocation(), |
3375 | diag::note_uninit_in_this_constructor) |
3376 | << (Constructor->isDefaultConstructor() && Constructor->isImplicit()); |
3377 | |
3378 | } |
3379 | |
3380 | void HandleValue(Expr *E, bool AddressOf) { |
3381 | E = E->IgnoreParens(); |
3382 | |
3383 | if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { |
3384 | HandleMemberExpr(ME, false /*CheckReferenceOnly*/, |
3385 | AddressOf /*AddressOf*/); |
3386 | return; |
3387 | } |
3388 | |
3389 | if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { |
3390 | Visit(CO->getCond()); |
3391 | HandleValue(CO->getTrueExpr(), AddressOf); |
3392 | HandleValue(CO->getFalseExpr(), AddressOf); |
3393 | return; |
3394 | } |
3395 | |
3396 | if (BinaryConditionalOperator *BCO = |
3397 | dyn_cast<BinaryConditionalOperator>(E)) { |
3398 | Visit(BCO->getCond()); |
3399 | HandleValue(BCO->getFalseExpr(), AddressOf); |
3400 | return; |
3401 | } |
3402 | |
3403 | if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) { |
3404 | HandleValue(OVE->getSourceExpr(), AddressOf); |
3405 | return; |
3406 | } |
3407 | |
3408 | if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { |
3409 | switch (BO->getOpcode()) { |
3410 | default: |
3411 | break; |
3412 | case(BO_PtrMemD): |
3413 | case(BO_PtrMemI): |
3414 | HandleValue(BO->getLHS(), AddressOf); |
3415 | Visit(BO->getRHS()); |
3416 | return; |
3417 | case(BO_Comma): |
3418 | Visit(BO->getLHS()); |
3419 | HandleValue(BO->getRHS(), AddressOf); |
3420 | return; |
3421 | } |
3422 | } |
3423 | |
3424 | Visit(E); |
3425 | } |
3426 | |
3427 | void CheckInitListExpr(InitListExpr *ILE) { |
3428 | InitFieldIndex.push_back(0); |
3429 | for (auto Child : ILE->children()) { |
3430 | if (InitListExpr *SubList = dyn_cast<InitListExpr>(Child)) { |
3431 | CheckInitListExpr(SubList); |
3432 | } else { |
3433 | Visit(Child); |
3434 | } |
3435 | ++InitFieldIndex.back(); |
3436 | } |
3437 | InitFieldIndex.pop_back(); |
3438 | } |
3439 | |
3440 | void CheckInitializer(Expr *E, const CXXConstructorDecl *FieldConstructor, |
3441 | FieldDecl *Field, const Type *BaseClass) { |
3442 | // Remove Decls that may have been initialized in the previous |
3443 | // initializer. |
3444 | for (ValueDecl* VD : DeclsToRemove) |
3445 | Decls.erase(VD); |
3446 | DeclsToRemove.clear(); |
3447 | |
3448 | Constructor = FieldConstructor; |
3449 | InitListExpr *ILE = dyn_cast<InitListExpr>(E); |
3450 | |
3451 | if (ILE && Field) { |
3452 | InitList = true; |
3453 | InitListFieldDecl = Field; |
3454 | InitFieldIndex.clear(); |
3455 | CheckInitListExpr(ILE); |
3456 | } else { |
3457 | InitList = false; |
3458 | Visit(E); |
3459 | } |
3460 | |
3461 | if (Field) |
3462 | Decls.erase(Field); |
3463 | if (BaseClass) |
3464 | BaseClasses.erase(BaseClass->getCanonicalTypeInternal()); |
3465 | } |
3466 | |
3467 | void VisitMemberExpr(MemberExpr *ME) { |
3468 | // All uses of unbounded reference fields will warn. |
3469 | HandleMemberExpr(ME, true /*CheckReferenceOnly*/, false /*AddressOf*/); |
3470 | } |
3471 | |
3472 | void VisitImplicitCastExpr(ImplicitCastExpr *E) { |
3473 | if (E->getCastKind() == CK_LValueToRValue) { |
3474 | HandleValue(E->getSubExpr(), false /*AddressOf*/); |
3475 | return; |
3476 | } |
3477 | |
3478 | Inherited::VisitImplicitCastExpr(E); |
3479 | } |
3480 | |
3481 | void VisitCXXConstructExpr(CXXConstructExpr *E) { |
3482 | if (E->getConstructor()->isCopyConstructor()) { |
3483 | Expr *ArgExpr = E->getArg(0); |
3484 | if (InitListExpr *ILE = dyn_cast<InitListExpr>(ArgExpr)) |
3485 | if (ILE->getNumInits() == 1) |
3486 | ArgExpr = ILE->getInit(0); |
3487 | if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr)) |
3488 | if (ICE->getCastKind() == CK_NoOp) |
3489 | ArgExpr = ICE->getSubExpr(); |
3490 | HandleValue(ArgExpr, false /*AddressOf*/); |
3491 | return; |
3492 | } |
3493 | Inherited::VisitCXXConstructExpr(E); |
3494 | } |
3495 | |
3496 | void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { |
3497 | Expr *Callee = E->getCallee(); |
3498 | if (isa<MemberExpr>(Callee)) { |
3499 | HandleValue(Callee, false /*AddressOf*/); |
3500 | for (auto Arg : E->arguments()) |
3501 | Visit(Arg); |
3502 | return; |
3503 | } |
3504 | |
3505 | Inherited::VisitCXXMemberCallExpr(E); |
3506 | } |
3507 | |
3508 | void VisitCallExpr(CallExpr *E) { |
3509 | // Treat std::move as a use. |
3510 | if (E->isCallToStdMove()) { |
3511 | HandleValue(E->getArg(0), /*AddressOf=*/false); |
3512 | return; |
3513 | } |
3514 | |
3515 | Inherited::VisitCallExpr(E); |
3516 | } |
3517 | |
3518 | void VisitCXXOperatorCallExpr(CXXOperatorCallExpr *E) { |
3519 | Expr *Callee = E->getCallee(); |
3520 | |
3521 | if (isa<UnresolvedLookupExpr>(Callee)) |
3522 | return Inherited::VisitCXXOperatorCallExpr(E); |
3523 | |
3524 | Visit(Callee); |
3525 | for (auto Arg : E->arguments()) |
3526 | HandleValue(Arg->IgnoreParenImpCasts(), false /*AddressOf*/); |
3527 | } |
3528 | |
3529 | void VisitBinaryOperator(BinaryOperator *E) { |
3530 | // If a field assignment is detected, remove the field from the |
3531 | // uninitiailized field set. |
3532 | if (E->getOpcode() == BO_Assign) |
3533 | if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getLHS())) |
3534 | if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) |
3535 | if (!FD->getType()->isReferenceType()) |
3536 | DeclsToRemove.push_back(FD); |
3537 | |
3538 | if (E->isCompoundAssignmentOp()) { |
3539 | HandleValue(E->getLHS(), false /*AddressOf*/); |
3540 | Visit(E->getRHS()); |
3541 | return; |
3542 | } |
3543 | |
3544 | Inherited::VisitBinaryOperator(E); |
3545 | } |
3546 | |
3547 | void VisitUnaryOperator(UnaryOperator *E) { |
3548 | if (E->isIncrementDecrementOp()) { |
3549 | HandleValue(E->getSubExpr(), false /*AddressOf*/); |
3550 | return; |
3551 | } |
3552 | if (E->getOpcode() == UO_AddrOf) { |
3553 | if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getSubExpr())) { |
3554 | HandleValue(ME->getBase(), true /*AddressOf*/); |
3555 | return; |
3556 | } |
3557 | } |
3558 | |
3559 | Inherited::VisitUnaryOperator(E); |
3560 | } |
3561 | }; |
3562 | |
3563 | // Diagnose value-uses of fields to initialize themselves, e.g. |
3564 | // foo(foo) |
3565 | // where foo is not also a parameter to the constructor. |
3566 | // Also diagnose across field uninitialized use such as |
3567 | // x(y), y(x) |
3568 | // TODO: implement -Wuninitialized and fold this into that framework. |
3569 | static void DiagnoseUninitializedFields( |
3570 | Sema &SemaRef, const CXXConstructorDecl *Constructor) { |
3571 | |
3572 | if (SemaRef.getDiagnostics().isIgnored(diag::warn_field_is_uninit, |
3573 | Constructor->getLocation())) { |
3574 | return; |
3575 | } |
3576 | |
3577 | if (Constructor->isInvalidDecl()) |
3578 | return; |
3579 | |
3580 | const CXXRecordDecl *RD = Constructor->getParent(); |
3581 | |
3582 | if (RD->getDescribedClassTemplate()) |
3583 | return; |
3584 | |
3585 | // Holds fields that are uninitialized. |
3586 | llvm::SmallPtrSet<ValueDecl*, 4> UninitializedFields; |
3587 | |
3588 | // At the beginning, all fields are uninitialized. |
3589 | for (auto *I : RD->decls()) { |
3590 | if (auto *FD = dyn_cast<FieldDecl>(I)) { |
3591 | UninitializedFields.insert(FD); |
3592 | } else if (auto *IFD = dyn_cast<IndirectFieldDecl>(I)) { |
3593 | UninitializedFields.insert(IFD->getAnonField()); |
3594 | } |
3595 | } |
3596 | |
3597 | llvm::SmallPtrSet<QualType, 4> UninitializedBaseClasses; |
3598 | for (auto I : RD->bases()) |
3599 | UninitializedBaseClasses.insert(I.getType().getCanonicalType()); |
3600 | |
3601 | if (UninitializedFields.empty() && UninitializedBaseClasses.empty()) |
3602 | return; |
3603 | |
3604 | UninitializedFieldVisitor UninitializedChecker(SemaRef, |
3605 | UninitializedFields, |
3606 | UninitializedBaseClasses); |
3607 | |
3608 | for (const auto *FieldInit : Constructor->inits()) { |
3609 | if (UninitializedFields.empty() && UninitializedBaseClasses.empty()) |
3610 | break; |
3611 | |
3612 | Expr *InitExpr = FieldInit->getInit(); |
3613 | if (!InitExpr) |
3614 | continue; |
3615 | |
3616 | if (CXXDefaultInitExpr *Default = |
3617 | dyn_cast<CXXDefaultInitExpr>(InitExpr)) { |
3618 | InitExpr = Default->getExpr(); |
3619 | if (!InitExpr) |
3620 | continue; |
3621 | // In class initializers will point to the constructor. |
3622 | UninitializedChecker.CheckInitializer(InitExpr, Constructor, |
3623 | FieldInit->getAnyMember(), |
3624 | FieldInit->getBaseClass()); |
3625 | } else { |
3626 | UninitializedChecker.CheckInitializer(InitExpr, nullptr, |
3627 | FieldInit->getAnyMember(), |
3628 | FieldInit->getBaseClass()); |
3629 | } |
3630 | } |
3631 | } |
3632 | } // namespace |
3633 | |
3634 | /// Enter a new C++ default initializer scope. After calling this, the |
3635 | /// caller must call \ref ActOnFinishCXXInClassMemberInitializer, even if |
3636 | /// parsing or instantiating the initializer failed. |
3637 | void Sema::ActOnStartCXXInClassMemberInitializer() { |
3638 | // Create a synthetic function scope to represent the call to the constructor |
3639 | // that notionally surrounds a use of this initializer. |
3640 | PushFunctionScope(); |
3641 | } |
3642 | |
3643 | /// This is invoked after parsing an in-class initializer for a |
3644 | /// non-static C++ class member, and after instantiating an in-class initializer |
3645 | /// in a class template. Such actions are deferred until the class is complete. |
3646 | void Sema::ActOnFinishCXXInClassMemberInitializer(Decl *D, |
3647 | SourceLocation InitLoc, |
3648 | Expr *InitExpr) { |
3649 | // Pop the notional constructor scope we created earlier. |
3650 | PopFunctionScopeInfo(nullptr, D); |
3651 | |
3652 | FieldDecl *FD = dyn_cast<FieldDecl>(D); |
3653 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 3654, __PRETTY_FUNCTION__)) |
3654 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 3654, __PRETTY_FUNCTION__)); |
3655 | |
3656 | if (!InitExpr) { |
3657 | D->setInvalidDecl(); |
3658 | if (FD) |
3659 | FD->removeInClassInitializer(); |
3660 | return; |
3661 | } |
3662 | |
3663 | if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { |
3664 | FD->setInvalidDecl(); |
3665 | FD->removeInClassInitializer(); |
3666 | return; |
3667 | } |
3668 | |
3669 | ExprResult Init = InitExpr; |
3670 | if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { |
3671 | InitializedEntity Entity = |
3672 | InitializedEntity::InitializeMemberFromDefaultMemberInitializer(FD); |
3673 | InitializationKind Kind = |
3674 | FD->getInClassInitStyle() == ICIS_ListInit |
3675 | ? InitializationKind::CreateDirectList(InitExpr->getBeginLoc(), |
3676 | InitExpr->getBeginLoc(), |
3677 | InitExpr->getEndLoc()) |
3678 | : InitializationKind::CreateCopy(InitExpr->getBeginLoc(), InitLoc); |
3679 | InitializationSequence Seq(*this, Entity, Kind, InitExpr); |
3680 | Init = Seq.Perform(*this, Entity, Kind, InitExpr); |
3681 | if (Init.isInvalid()) { |
3682 | FD->setInvalidDecl(); |
3683 | return; |
3684 | } |
3685 | } |
3686 | |
3687 | // C++11 [class.base.init]p7: |
3688 | // The initialization of each base and member constitutes a |
3689 | // full-expression. |
3690 | Init = ActOnFinishFullExpr(Init.get(), InitLoc, /*DiscardedValue*/ false); |
3691 | if (Init.isInvalid()) { |
3692 | FD->setInvalidDecl(); |
3693 | return; |
3694 | } |
3695 | |
3696 | InitExpr = Init.get(); |
3697 | |
3698 | FD->setInClassInitializer(InitExpr); |
3699 | } |
3700 | |
3701 | /// Find the direct and/or virtual base specifiers that |
3702 | /// correspond to the given base type, for use in base initialization |
3703 | /// within a constructor. |
3704 | static bool FindBaseInitializer(Sema &SemaRef, |
3705 | CXXRecordDecl *ClassDecl, |
3706 | QualType BaseType, |
3707 | const CXXBaseSpecifier *&DirectBaseSpec, |
3708 | const CXXBaseSpecifier *&VirtualBaseSpec) { |
3709 | // First, check for a direct base class. |
3710 | DirectBaseSpec = nullptr; |
3711 | for (const auto &Base : ClassDecl->bases()) { |
3712 | if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base.getType())) { |
3713 | // We found a direct base of this type. That's what we're |
3714 | // initializing. |
3715 | DirectBaseSpec = &Base; |
3716 | break; |
3717 | } |
3718 | } |
3719 | |
3720 | // Check for a virtual base class. |
3721 | // FIXME: We might be able to short-circuit this if we know in advance that |
3722 | // there are no virtual bases. |
3723 | VirtualBaseSpec = nullptr; |
3724 | if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { |
3725 | // We haven't found a base yet; search the class hierarchy for a |
3726 | // virtual base class. |
3727 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, |
3728 | /*DetectVirtual=*/false); |
3729 | if (SemaRef.IsDerivedFrom(ClassDecl->getLocation(), |
3730 | SemaRef.Context.getTypeDeclType(ClassDecl), |
3731 | BaseType, Paths)) { |
3732 | for (CXXBasePaths::paths_iterator Path = Paths.begin(); |
3733 | Path != Paths.end(); ++Path) { |
3734 | if (Path->back().Base->isVirtual()) { |
3735 | VirtualBaseSpec = Path->back().Base; |
3736 | break; |
3737 | } |
3738 | } |
3739 | } |
3740 | } |
3741 | |
3742 | return DirectBaseSpec || VirtualBaseSpec; |
3743 | } |
3744 | |
3745 | /// Handle a C++ member initializer using braced-init-list syntax. |
3746 | MemInitResult |
3747 | Sema::ActOnMemInitializer(Decl *ConstructorD, |
3748 | Scope *S, |
3749 | CXXScopeSpec &SS, |
3750 | IdentifierInfo *MemberOrBase, |
3751 | ParsedType TemplateTypeTy, |
3752 | const DeclSpec &DS, |
3753 | SourceLocation IdLoc, |
3754 | Expr *InitList, |
3755 | SourceLocation EllipsisLoc) { |
3756 | return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, |
3757 | DS, IdLoc, InitList, |
3758 | EllipsisLoc); |
3759 | } |
3760 | |
3761 | /// Handle a C++ member initializer using parentheses syntax. |
3762 | MemInitResult |
3763 | Sema::ActOnMemInitializer(Decl *ConstructorD, |
3764 | Scope *S, |
3765 | CXXScopeSpec &SS, |
3766 | IdentifierInfo *MemberOrBase, |
3767 | ParsedType TemplateTypeTy, |
3768 | const DeclSpec &DS, |
3769 | SourceLocation IdLoc, |
3770 | SourceLocation LParenLoc, |
3771 | ArrayRef<Expr *> Args, |
3772 | SourceLocation RParenLoc, |
3773 | SourceLocation EllipsisLoc) { |
3774 | Expr *List = ParenListExpr::Create(Context, LParenLoc, Args, RParenLoc); |
3775 | return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, |
3776 | DS, IdLoc, List, EllipsisLoc); |
3777 | } |
3778 | |
3779 | namespace { |
3780 | |
3781 | // Callback to only accept typo corrections that can be a valid C++ member |
3782 | // intializer: either a non-static field member or a base class. |
3783 | class MemInitializerValidatorCCC final : public CorrectionCandidateCallback { |
3784 | public: |
3785 | explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) |
3786 | : ClassDecl(ClassDecl) {} |
3787 | |
3788 | bool ValidateCandidate(const TypoCorrection &candidate) override { |
3789 | if (NamedDecl *ND = candidate.getCorrectionDecl()) { |
3790 | if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) |
3791 | return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); |
3792 | return isa<TypeDecl>(ND); |
3793 | } |
3794 | return false; |
3795 | } |
3796 | |
3797 | std::unique_ptr<CorrectionCandidateCallback> clone() override { |
3798 | return llvm::make_unique<MemInitializerValidatorCCC>(*this); |
3799 | } |
3800 | |
3801 | private: |
3802 | CXXRecordDecl *ClassDecl; |
3803 | }; |
3804 | |
3805 | } |
3806 | |
3807 | ValueDecl *Sema::tryLookupCtorInitMemberDecl(CXXRecordDecl *ClassDecl, |
3808 | CXXScopeSpec &SS, |
3809 | ParsedType TemplateTypeTy, |
3810 | IdentifierInfo *MemberOrBase) { |
3811 | if (SS.getScopeRep() || TemplateTypeTy) |
3812 | return nullptr; |
3813 | DeclContext::lookup_result Result = ClassDecl->lookup(MemberOrBase); |
3814 | if (Result.empty()) |
3815 | return nullptr; |
3816 | ValueDecl *Member; |
3817 | if ((Member = dyn_cast<FieldDecl>(Result.front())) || |
3818 | (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) |
3819 | return Member; |
3820 | return nullptr; |
3821 | } |
3822 | |
3823 | /// Handle a C++ member initializer. |
3824 | MemInitResult |
3825 | Sema::BuildMemInitializer(Decl *ConstructorD, |
3826 | Scope *S, |
3827 | CXXScopeSpec &SS, |
3828 | IdentifierInfo *MemberOrBase, |
3829 | ParsedType TemplateTypeTy, |
3830 | const DeclSpec &DS, |
3831 | SourceLocation IdLoc, |
3832 | Expr *Init, |
3833 | SourceLocation EllipsisLoc) { |
3834 | ExprResult Res = CorrectDelayedTyposInExpr(Init); |
3835 | if (!Res.isUsable()) |
3836 | return true; |
3837 | Init = Res.get(); |
3838 | |
3839 | if (!ConstructorD) |
3840 | return true; |
3841 | |
3842 | AdjustDeclIfTemplate(ConstructorD); |
3843 | |
3844 | CXXConstructorDecl *Constructor |
3845 | = dyn_cast<CXXConstructorDecl>(ConstructorD); |
3846 | if (!Constructor) { |
3847 | // The user wrote a constructor initializer on a function that is |
3848 | // not a C++ constructor. Ignore the error for now, because we may |
3849 | // have more member initializers coming; we'll diagnose it just |
3850 | // once in ActOnMemInitializers. |
3851 | return true; |
3852 | } |
3853 | |
3854 | CXXRecordDecl *ClassDecl = Constructor->getParent(); |
3855 | |
3856 | // C++ [class.base.init]p2: |
3857 | // Names in a mem-initializer-id are looked up in the scope of the |
3858 | // constructor's class and, if not found in that scope, are looked |
3859 | // up in the scope containing the constructor's definition. |
3860 | // [Note: if the constructor's class contains a member with the |
3861 | // same name as a direct or virtual base class of the class, a |
3862 | // mem-initializer-id naming the member or base class and composed |
3863 | // of a single identifier refers to the class member. A |
3864 | // mem-initializer-id for the hidden base class may be specified |
3865 | // using a qualified name. ] |
3866 | |
3867 | // Look for a member, first. |
3868 | if (ValueDecl *Member = tryLookupCtorInitMemberDecl( |
3869 | ClassDecl, SS, TemplateTypeTy, MemberOrBase)) { |
3870 | if (EllipsisLoc.isValid()) |
3871 | Diag(EllipsisLoc, diag::err_pack_expansion_member_init) |
3872 | << MemberOrBase |
3873 | << SourceRange(IdLoc, Init->getSourceRange().getEnd()); |
3874 | |
3875 | return BuildMemberInitializer(Member, Init, IdLoc); |
3876 | } |
3877 | // It didn't name a member, so see if it names a class. |
3878 | QualType BaseType; |
3879 | TypeSourceInfo *TInfo = nullptr; |
3880 | |
3881 | if (TemplateTypeTy) { |
3882 | BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); |
3883 | if (BaseType.isNull()) |
3884 | return true; |
3885 | } else if (DS.getTypeSpecType() == TST_decltype) { |
3886 | BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); |
3887 | } else if (DS.getTypeSpecType() == TST_decltype_auto) { |
3888 | Diag(DS.getTypeSpecTypeLoc(), diag::err_decltype_auto_invalid); |
3889 | return true; |
3890 | } else { |
3891 | LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); |
3892 | LookupParsedName(R, S, &SS); |
3893 | |
3894 | TypeDecl *TyD = R.getAsSingle<TypeDecl>(); |
3895 | if (!TyD) { |
3896 | if (R.isAmbiguous()) return true; |
3897 | |
3898 | // We don't want access-control diagnostics here. |
3899 | R.suppressDiagnostics(); |
3900 | |
3901 | if (SS.isSet() && isDependentScopeSpecifier(SS)) { |
3902 | bool NotUnknownSpecialization = false; |
3903 | DeclContext *DC = computeDeclContext(SS, false); |
3904 | if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) |
3905 | NotUnknownSpecialization = !Record->hasAnyDependentBases(); |
3906 | |
3907 | if (!NotUnknownSpecialization) { |
3908 | // When the scope specifier can refer to a member of an unknown |
3909 | // specialization, we take it as a type name. |
3910 | BaseType = CheckTypenameType(ETK_None, SourceLocation(), |
3911 | SS.getWithLocInContext(Context), |
3912 | *MemberOrBase, IdLoc); |
3913 | if (BaseType.isNull()) |
3914 | return true; |
3915 | |
3916 | TInfo = Context.CreateTypeSourceInfo(BaseType); |
3917 | DependentNameTypeLoc TL = |
3918 | TInfo->getTypeLoc().castAs<DependentNameTypeLoc>(); |
3919 | if (!TL.isNull()) { |
3920 | TL.setNameLoc(IdLoc); |
3921 | TL.setElaboratedKeywordLoc(SourceLocation()); |
3922 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); |
3923 | } |
3924 | |
3925 | R.clear(); |
3926 | R.setLookupName(MemberOrBase); |
3927 | } |
3928 | } |
3929 | |
3930 | // If no results were found, try to correct typos. |
3931 | TypoCorrection Corr; |
3932 | MemInitializerValidatorCCC CCC(ClassDecl); |
3933 | if (R.empty() && BaseType.isNull() && |
3934 | (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, |
3935 | CCC, CTK_ErrorRecovery, ClassDecl))) { |
3936 | if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { |
3937 | // We have found a non-static data member with a similar |
3938 | // name to what was typed; complain and initialize that |
3939 | // member. |
3940 | diagnoseTypo(Corr, |
3941 | PDiag(diag::err_mem_init_not_member_or_class_suggest) |
3942 | << MemberOrBase << true); |
3943 | return BuildMemberInitializer(Member, Init, IdLoc); |
3944 | } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { |
3945 | const CXXBaseSpecifier *DirectBaseSpec; |
3946 | const CXXBaseSpecifier *VirtualBaseSpec; |
3947 | if (FindBaseInitializer(*this, ClassDecl, |
3948 | Context.getTypeDeclType(Type), |
3949 | DirectBaseSpec, VirtualBaseSpec)) { |
3950 | // We have found a direct or virtual base class with a |
3951 | // similar name to what was typed; complain and initialize |
3952 | // that base class. |
3953 | diagnoseTypo(Corr, |
3954 | PDiag(diag::err_mem_init_not_member_or_class_suggest) |
3955 | << MemberOrBase << false, |
3956 | PDiag() /*Suppress note, we provide our own.*/); |
3957 | |
3958 | const CXXBaseSpecifier *BaseSpec = DirectBaseSpec ? DirectBaseSpec |
3959 | : VirtualBaseSpec; |
3960 | Diag(BaseSpec->getBeginLoc(), diag::note_base_class_specified_here) |
3961 | << BaseSpec->getType() << BaseSpec->getSourceRange(); |
3962 | |
3963 | TyD = Type; |
3964 | } |
3965 | } |
3966 | } |
3967 | |
3968 | if (!TyD && BaseType.isNull()) { |
3969 | Diag(IdLoc, diag::err_mem_init_not_member_or_class) |
3970 | << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); |
3971 | return true; |
3972 | } |
3973 | } |
3974 | |
3975 | if (BaseType.isNull()) { |
3976 | BaseType = Context.getTypeDeclType(TyD); |
3977 | MarkAnyDeclReferenced(TyD->getLocation(), TyD, /*OdrUse=*/false); |
3978 | if (SS.isSet()) { |
3979 | BaseType = Context.getElaboratedType(ETK_None, SS.getScopeRep(), |
3980 | BaseType); |
3981 | TInfo = Context.CreateTypeSourceInfo(BaseType); |
3982 | ElaboratedTypeLoc TL = TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>(); |
3983 | TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(IdLoc); |
3984 | TL.setElaboratedKeywordLoc(SourceLocation()); |
3985 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); |
3986 | } |
3987 | } |
3988 | } |
3989 | |
3990 | if (!TInfo) |
3991 | TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); |
3992 | |
3993 | return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); |
3994 | } |
3995 | |
3996 | MemInitResult |
3997 | Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, |
3998 | SourceLocation IdLoc) { |
3999 | FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); |
4000 | IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); |
4001 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 4002, __PRETTY_FUNCTION__)) |
4002 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 4002, __PRETTY_FUNCTION__)); |
4003 | |
4004 | if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) |
4005 | return true; |
4006 | |
4007 | if (Member->isInvalidDecl()) |
4008 | return true; |
4009 | |
4010 | MultiExprArg Args; |
4011 | if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { |
4012 | Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); |
4013 | } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) { |
4014 | Args = MultiExprArg(InitList->getInits(), InitList->getNumInits()); |
4015 | } else { |
4016 | // Template instantiation doesn't reconstruct ParenListExprs for us. |
4017 | Args = Init; |
4018 | } |
4019 | |
4020 | SourceRange InitRange = Init->getSourceRange(); |
4021 | |
4022 | if (Member->getType()->isDependentType() || Init->isTypeDependent()) { |
4023 | // Can't check initialization for a member of dependent type or when |
4024 | // any of the arguments are type-dependent expressions. |
4025 | DiscardCleanupsInEvaluationContext(); |
4026 | } else { |
4027 | bool InitList = false; |
4028 | if (isa<InitListExpr>(Init)) { |
4029 | InitList = true; |
4030 | Args = Init; |
4031 | } |
4032 | |
4033 | // Initialize the member. |
4034 | InitializedEntity MemberEntity = |
4035 | DirectMember ? InitializedEntity::InitializeMember(DirectMember, nullptr) |
4036 | : InitializedEntity::InitializeMember(IndirectMember, |
4037 | nullptr); |
4038 | InitializationKind Kind = |
4039 | InitList ? InitializationKind::CreateDirectList( |
4040 | IdLoc, Init->getBeginLoc(), Init->getEndLoc()) |
4041 | : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), |
4042 | InitRange.getEnd()); |
4043 | |
4044 | InitializationSequence InitSeq(*this, MemberEntity, Kind, Args); |
4045 | ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, Args, |
4046 | nullptr); |
4047 | if (MemberInit.isInvalid()) |
4048 | return true; |
4049 | |
4050 | // C++11 [class.base.init]p7: |
4051 | // The initialization of each base and member constitutes a |
4052 | // full-expression. |
4053 | MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin(), |
4054 | /*DiscardedValue*/ false); |
4055 | if (MemberInit.isInvalid()) |
4056 | return true; |
4057 | |
4058 | Init = MemberInit.get(); |
4059 | } |
4060 | |
4061 | if (DirectMember) { |
4062 | return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, |
4063 | InitRange.getBegin(), Init, |
4064 | InitRange.getEnd()); |
4065 | } else { |
4066 | return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, |
4067 | InitRange.getBegin(), Init, |
4068 | InitRange.getEnd()); |
4069 | } |
4070 | } |
4071 | |
4072 | MemInitResult |
4073 | Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, |
4074 | CXXRecordDecl *ClassDecl) { |
4075 | SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); |
4076 | if (!LangOpts.CPlusPlus11) |
4077 | return Diag(NameLoc, diag::err_delegating_ctor) |
4078 | << TInfo->getTypeLoc().getLocalSourceRange(); |
4079 | Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); |
4080 | |
4081 | bool InitList = true; |
4082 | MultiExprArg Args = Init; |
4083 | if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { |
4084 | InitList = false; |
4085 | Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); |
4086 | } |
4087 | |
4088 | SourceRange InitRange = Init->getSourceRange(); |
4089 | // Initialize the object. |
4090 | InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( |
4091 | QualType(ClassDecl->getTypeForDecl(), 0)); |
4092 | InitializationKind Kind = |
4093 | InitList ? InitializationKind::CreateDirectList( |
4094 | NameLoc, Init->getBeginLoc(), Init->getEndLoc()) |
4095 | : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), |
4096 | InitRange.getEnd()); |
4097 | InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args); |
4098 | ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, |
4099 | Args, nullptr); |
4100 | if (DelegationInit.isInvalid()) |
4101 | return true; |
4102 | |
4103 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 4104, __PRETTY_FUNCTION__)) |
4104 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 4104, __PRETTY_FUNCTION__)); |
4105 | |
4106 | // C++11 [class.base.init]p7: |
4107 | // The initialization of each base and member constitutes a |
4108 | // full-expression. |
4109 | DelegationInit = ActOnFinishFullExpr( |
4110 | DelegationInit.get(), InitRange.getBegin(), /*DiscardedValue*/ false); |
4111 | if (DelegationInit.isInvalid()) |
4112 | return true; |
4113 | |
4114 | // If we are in a dependent context, template instantiation will |
4115 | // perform this type-checking again. Just save the arguments that we |
4116 | // received in a ParenListExpr. |
4117 | // FIXME: This isn't quite ideal, since our ASTs don't capture all |
4118 | // of the information that we have about the base |
4119 | // initializer. However, deconstructing the ASTs is a dicey process, |
4120 | // and this approach is far more likely to get the corner cases right. |
4121 | if (CurContext->isDependentContext()) |
4122 | DelegationInit = Init; |
4123 | |
4124 | return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), |
4125 | DelegationInit.getAs<Expr>(), |
4126 | InitRange.getEnd()); |
4127 | } |
4128 | |
4129 | MemInitResult |
4130 | Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, |
4131 | Expr *Init, CXXRecordDecl *ClassDecl, |
4132 | SourceLocation EllipsisLoc) { |
4133 | SourceLocation BaseLoc |
4134 | = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); |
4135 | |
4136 | if (!BaseType->isDependentType() && !BaseType->isRecordType()) |
4137 | return Diag(BaseLoc, diag::err_base_init_does_not_name_class) |
4138 | << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); |
4139 | |
4140 | // C++ [class.base.init]p2: |
4141 | // [...] Unless the mem-initializer-id names a nonstatic data |
4142 | // member of the constructor's class or a direct or virtual base |
4143 | // of that class, the mem-initializer is ill-formed. A |
4144 | // mem-initializer-list can initialize a base class using any |
4145 | // name that denotes that base class type. |
4146 | bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); |
4147 | |
4148 | SourceRange InitRange = Init->getSourceRange(); |
4149 | if (EllipsisLoc.isValid()) { |
4150 | // This is a pack expansion. |
4151 | if (!BaseType->containsUnexpandedParameterPack()) { |
4152 | Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) |
4153 | << SourceRange(BaseLoc, InitRange.getEnd()); |
4154 | |
4155 | EllipsisLoc = SourceLocation(); |
4156 | } |
4157 | } else { |
4158 | // Check for any unexpanded parameter packs. |
4159 | if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) |
4160 | return true; |
4161 | |
4162 | if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) |
4163 | return true; |
4164 | } |
4165 | |
4166 | // Check for direct and virtual base classes. |
4167 | const CXXBaseSpecifier *DirectBaseSpec = nullptr; |
4168 | const CXXBaseSpecifier *VirtualBaseSpec = nullptr; |
4169 | if (!Dependent) { |
4170 | if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), |
4171 | BaseType)) |
4172 | return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); |
4173 | |
4174 | FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, |
4175 | VirtualBaseSpec); |
4176 | |
4177 | // C++ [base.class.init]p2: |
4178 | // Unless the mem-initializer-id names a nonstatic data member of the |
4179 | // constructor's class or a direct or virtual base of that class, the |
4180 | // mem-initializer is ill-formed. |
4181 | if (!DirectBaseSpec && !VirtualBaseSpec) { |
4182 | // If the class has any dependent bases, then it's possible that |
4183 | // one of those types will resolve to the same type as |
4184 | // BaseType. Therefore, just treat this as a dependent base |
4185 | // class initialization. FIXME: Should we try to check the |
4186 | // initialization anyway? It seems odd. |
4187 | if (ClassDecl->hasAnyDependentBases()) |
4188 | Dependent = true; |
4189 | else |
4190 | return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) |
4191 | << BaseType << Context.getTypeDeclType(ClassDecl) |
4192 | << BaseTInfo->getTypeLoc().getLocalSourceRange(); |
4193 | } |
4194 | } |
4195 | |
4196 | if (Dependent) { |
4197 | DiscardCleanupsInEvaluationContext(); |
4198 | |
4199 | return new (Context) CXXCtorInitializer(Context, BaseTInfo, |
4200 | /*IsVirtual=*/false, |
4201 | InitRange.getBegin(), Init, |
4202 | InitRange.getEnd(), EllipsisLoc); |
4203 | } |
4204 | |
4205 | // C++ [base.class.init]p2: |
4206 | // If a mem-initializer-id is ambiguous because it designates both |
4207 | // a direct non-virtual base class and an inherited virtual base |
4208 | // class, the mem-initializer is ill-formed. |
4209 | if (DirectBaseSpec && VirtualBaseSpec) |
4210 | return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) |
4211 | << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); |
4212 | |
4213 | const CXXBaseSpecifier *BaseSpec = DirectBaseSpec; |
4214 | if (!BaseSpec) |
4215 | BaseSpec = VirtualBaseSpec; |
4216 | |
4217 | // Initialize the base. |
4218 | bool InitList = true; |
4219 | MultiExprArg Args = Init; |
4220 | if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { |
4221 | InitList = false; |
4222 | Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); |
4223 | } |
4224 | |
4225 | InitializedEntity BaseEntity = |
4226 | InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); |
4227 | InitializationKind Kind = |
4228 | InitList ? InitializationKind::CreateDirectList(BaseLoc) |
4229 | : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), |
4230 | InitRange.getEnd()); |
4231 | InitializationSequence InitSeq(*this, BaseEntity, Kind, Args); |
4232 | ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, Args, nullptr); |
4233 | if (BaseInit.isInvalid()) |
4234 | return true; |
4235 | |
4236 | // C++11 [class.base.init]p7: |
4237 | // The initialization of each base and member constitutes a |
4238 | // full-expression. |
4239 | BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin(), |
4240 | /*DiscardedValue*/ false); |
4241 | if (BaseInit.isInvalid()) |
4242 | return true; |
4243 | |
4244 | // If we are in a dependent context, template instantiation will |
4245 | // perform this type-checking again. Just save the arguments that we |
4246 | // received in a ParenListExpr. |
4247 | // FIXME: This isn't quite ideal, since our ASTs don't capture all |
4248 | // of the information that we have about the base |
4249 | // initializer. However, deconstructing the ASTs is a dicey process, |
4250 | // and this approach is far more likely to get the corner cases right. |
4251 | if (CurContext->isDependentContext()) |
4252 | BaseInit = Init; |
4253 | |
4254 | return new (Context) CXXCtorInitializer(Context, BaseTInfo, |
4255 | BaseSpec->isVirtual(), |
4256 | InitRange.getBegin(), |
4257 | BaseInit.getAs<Expr>(), |
4258 | InitRange.getEnd(), EllipsisLoc); |
4259 | } |
4260 | |
4261 | // Create a static_cast\<T&&>(expr). |
4262 | static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) { |
4263 | if (T.isNull()) T = E->getType(); |
4264 | QualType TargetType = SemaRef.BuildReferenceType( |
4265 | T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName()); |
4266 | SourceLocation ExprLoc = E->getBeginLoc(); |
4267 | TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( |
4268 | TargetType, ExprLoc); |
4269 | |
4270 | return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, |
4271 | SourceRange(ExprLoc, ExprLoc), |
4272 | E->getSourceRange()).get(); |
4273 | } |
4274 | |
4275 | /// ImplicitInitializerKind - How an implicit base or member initializer should |
4276 | /// initialize its base or member. |
4277 | enum ImplicitInitializerKind { |
4278 | IIK_Default, |
4279 | IIK_Copy, |
4280 | IIK_Move, |
4281 | IIK_Inherit |
4282 | }; |
4283 | |
4284 | static bool |
4285 | BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, |
4286 | ImplicitInitializerKind ImplicitInitKind, |
4287 | CXXBaseSpecifier *BaseSpec, |
4288 | bool IsInheritedVirtualBase, |
4289 | CXXCtorInitializer *&CXXBaseInit) { |
4290 | InitializedEntity InitEntity |
4291 | = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, |
4292 | IsInheritedVirtualBase); |
4293 | |
4294 | ExprResult BaseInit; |
4295 | |
4296 | switch (ImplicitInitKind) { |
4297 | case IIK_Inherit: |
4298 | case IIK_Default: { |
4299 | InitializationKind InitKind |
4300 | = InitializationKind::CreateDefault(Constructor->getLocation()); |
4301 | InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); |
4302 | BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, None); |
4303 | break; |
4304 | } |
4305 | |
4306 | case IIK_Move: |
4307 | case IIK_Copy: { |
4308 | bool Moving = ImplicitInitKind == IIK_Move; |
4309 | ParmVarDecl *Param = Constructor->getParamDecl(0); |
4310 | QualType ParamType = Param->getType().getNonReferenceType(); |
4311 | |
4312 | Expr *CopyCtorArg = |
4313 | DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), |
4314 | SourceLocation(), Param, false, |
4315 | Constructor->getLocation(), ParamType, |
4316 | VK_LValue, nullptr); |
4317 | |
4318 | SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); |
4319 | |
4320 | // Cast to the base class to avoid ambiguities. |
4321 | QualType ArgTy = |
4322 | SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), |
4323 | ParamType.getQualifiers()); |
4324 | |
4325 | if (Moving) { |
4326 | CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); |
4327 | } |
4328 | |
4329 | CXXCastPath BasePath; |
4330 | BasePath.push_back(BaseSpec); |
4331 | CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, |
4332 | CK_UncheckedDerivedToBase, |
4333 | Moving ? VK_XValue : VK_LValue, |
4334 | &BasePath).get(); |
4335 | |
4336 | InitializationKind InitKind |
4337 | = InitializationKind::CreateDirect(Constructor->getLocation(), |
4338 | SourceLocation(), SourceLocation()); |
4339 | InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, CopyCtorArg); |
4340 | BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, CopyCtorArg); |
4341 | break; |
4342 | } |
4343 | } |
4344 | |
4345 | BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); |
4346 | if (BaseInit.isInvalid()) |
4347 | return true; |
4348 | |
4349 | CXXBaseInit = |
4350 | new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, |
4351 | SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), |
4352 | SourceLocation()), |
4353 | BaseSpec->isVirtual(), |
4354 | SourceLocation(), |
4355 | BaseInit.getAs<Expr>(), |
4356 | SourceLocation(), |
4357 | SourceLocation()); |
4358 | |
4359 | return false; |
4360 | } |
4361 | |
4362 | static bool RefersToRValueRef(Expr *MemRef) { |
4363 | ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); |
4364 | return Referenced->getType()->isRValueReferenceType(); |
4365 | } |
4366 | |
4367 | static bool |
4368 | BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, |
4369 | ImplicitInitializerKind ImplicitInitKind, |
4370 | FieldDecl *Field, IndirectFieldDecl *Indirect, |
4371 | CXXCtorInitializer *&CXXMemberInit) { |
4372 | if (Field->isInvalidDecl()) |
4373 | return true; |
4374 | |
4375 | SourceLocation Loc = Constructor->getLocation(); |
4376 | |
4377 | if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { |
4378 | bool Moving = ImplicitInitKind == IIK_Move; |
4379 | ParmVarDecl *Param = Constructor->getParamDecl(0); |
4380 | QualType ParamType = Param->getType().getNonReferenceType(); |
4381 | |
4382 | // Suppress copying zero-width bitfields. |
4383 | if (Field->isZeroLengthBitField(SemaRef.Context)) |
4384 | return false; |
4385 | |
4386 | Expr *MemberExprBase = |
4387 | DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), |
4388 | SourceLocation(), Param, false, |
4389 | Loc, ParamType, VK_LValue, nullptr); |
4390 | |
4391 | SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); |
4392 | |
4393 | if (Moving) { |
4394 | MemberExprBase = CastForMoving(SemaRef, MemberExprBase); |
4395 | } |
4396 | |
4397 | // Build a reference to this field within the parameter. |
4398 | CXXScopeSpec SS; |
4399 | LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, |
4400 | Sema::LookupMemberName); |
4401 | MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) |
4402 | : cast<ValueDecl>(Field), AS_public); |
4403 | MemberLookup.resolveKind(); |
4404 | ExprResult CtorArg |
4405 | = SemaRef.BuildMemberReferenceExpr(MemberExprBase, |
4406 | ParamType, Loc, |
4407 | /*IsArrow=*/false, |
4408 | SS, |
4409 | /*TemplateKWLoc=*/SourceLocation(), |
4410 | /*FirstQualifierInScope=*/nullptr, |
4411 | MemberLookup, |
4412 | /*TemplateArgs=*/nullptr, |
4413 | /*S*/nullptr); |
4414 | if (CtorArg.isInvalid()) |
4415 | return true; |
4416 | |
4417 | // C++11 [class.copy]p15: |
4418 | // - if a member m has rvalue reference type T&&, it is direct-initialized |
4419 | // with static_cast<T&&>(x.m); |
4420 | if (RefersToRValueRef(CtorArg.get())) { |
4421 | CtorArg = CastForMoving(SemaRef, CtorArg.get()); |
4422 | } |
4423 | |
4424 | InitializedEntity Entity = |
4425 | Indirect ? InitializedEntity::InitializeMember(Indirect, nullptr, |
4426 | /*Implicit*/ true) |
4427 | : InitializedEntity::InitializeMember(Field, nullptr, |
4428 | /*Implicit*/ true); |
4429 | |
4430 | // Direct-initialize to use the copy constructor. |
4431 | InitializationKind InitKind = |
4432 | InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); |
4433 | |
4434 | Expr *CtorArgE = CtorArg.getAs<Expr>(); |
4435 | InitializationSequence InitSeq(SemaRef, Entity, InitKind, CtorArgE); |
4436 | ExprResult MemberInit = |
4437 | InitSeq.Perform(SemaRef, Entity, InitKind, MultiExprArg(&CtorArgE, 1)); |
4438 | MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); |
4439 | if (MemberInit.isInvalid()) |
4440 | return true; |
4441 | |
4442 | if (Indirect) |
4443 | CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer( |
4444 | SemaRef.Context, Indirect, Loc, Loc, MemberInit.getAs<Expr>(), Loc); |
4445 | else |
4446 | CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer( |
4447 | SemaRef.Context, Field, Loc, Loc, MemberInit.getAs<Expr>(), Loc); |
4448 | return false; |
4449 | } |
4450 | |
4451 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 4452, __PRETTY_FUNCTION__)) |
4452 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 4452, __PRETTY_FUNCTION__)); |
4453 | |
4454 | QualType FieldBaseElementType = |
4455 | SemaRef.Context.getBaseElementType(Field->getType()); |
4456 | |
4457 | if (FieldBaseElementType->isRecordType()) { |
4458 | InitializedEntity InitEntity = |
4459 | Indirect ? InitializedEntity::InitializeMember(Indirect, nullptr, |
4460 | /*Implicit*/ true) |
4461 | : InitializedEntity::InitializeMember(Field, nullptr, |
4462 | /*Implicit*/ true); |
4463 | InitializationKind InitKind = |
4464 | InitializationKind::CreateDefault(Loc); |
4465 | |
4466 | InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); |
4467 | ExprResult MemberInit = |
4468 | InitSeq.Perform(SemaRef, InitEntity, InitKind, None); |
4469 | |
4470 | MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); |
4471 | if (MemberInit.isInvalid()) |
4472 | return true; |
4473 | |
4474 | if (Indirect) |
4475 | CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, |
4476 | Indirect, Loc, |
4477 | Loc, |
4478 | MemberInit.get(), |
4479 | Loc); |
4480 | else |
4481 | CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, |
4482 | Field, Loc, Loc, |
4483 | MemberInit.get(), |
4484 | Loc); |
4485 | return false; |
4486 | } |
4487 | |
4488 | if (!Field->getParent()->isUnion()) { |
4489 | if (FieldBaseElementType->isReferenceType()) { |
4490 | SemaRef.Diag(Constructor->getLocation(), |
4491 | diag::err_uninitialized_member_in_ctor) |
4492 | << (int)Constructor->isImplicit() |
4493 | << SemaRef.Context.getTagDeclType(Constructor->getParent()) |
4494 | << 0 << Field->getDeclName(); |
4495 | SemaRef.Diag(Field->getLocation(), diag::note_declared_at); |
4496 | return true; |
4497 | } |
4498 | |
4499 | if (FieldBaseElementType.isConstQualified()) { |
4500 | SemaRef.Diag(Constructor->getLocation(), |
4501 | diag::err_uninitialized_member_in_ctor) |
4502 | << (int)Constructor->isImplicit() |
4503 | << SemaRef.Context.getTagDeclType(Constructor->getParent()) |
4504 | << 1 << Field->getDeclName(); |
4505 | SemaRef.Diag(Field->getLocation(), diag::note_declared_at); |
4506 | return true; |
4507 | } |
4508 | } |
4509 | |
4510 | if (FieldBaseElementType.hasNonTrivialObjCLifetime()) { |
4511 | // ARC and Weak: |
4512 | // Default-initialize Objective-C pointers to NULL. |
4513 | CXXMemberInit |
4514 | = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, |
4515 | Loc, Loc, |
4516 | new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), |
4517 | Loc); |
4518 | return false; |
4519 | } |
4520 | |
4521 | // Nothing to initialize. |
4522 | CXXMemberInit = nullptr; |
4523 | return false; |
4524 | } |
4525 | |
4526 | namespace { |
4527 | struct BaseAndFieldInfo { |
4528 | Sema &S; |
4529 | CXXConstructorDecl *Ctor; |
4530 | bool AnyErrorsInInits; |
4531 | ImplicitInitializerKind IIK; |
4532 | llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; |
4533 | SmallVector<CXXCtorInitializer*, 8> AllToInit; |
4534 | llvm::DenseMap<TagDecl*, FieldDecl*> ActiveUnionMember; |
4535 | |
4536 | BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) |
4537 | : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { |
4538 | bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); |
4539 | if (Ctor->getInheritedConstructor()) |
4540 | IIK = IIK_Inherit; |
4541 | else if (Generated && Ctor->isCopyConstructor()) |
4542 | IIK = IIK_Copy; |
4543 | else if (Generated && Ctor->isMoveConstructor()) |
4544 | IIK = IIK_Move; |
4545 | else |
4546 | IIK = IIK_Default; |
4547 | } |
4548 | |
4549 | bool isImplicitCopyOrMove() const { |
4550 | switch (IIK) { |
4551 | case IIK_Copy: |
4552 | case IIK_Move: |
4553 | return true; |
4554 | |
4555 | case IIK_Default: |
4556 | case IIK_Inherit: |
4557 | return false; |
4558 | } |
4559 | |
4560 | llvm_unreachable("Invalid ImplicitInitializerKind!")::llvm::llvm_unreachable_internal("Invalid ImplicitInitializerKind!" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 4560); |
4561 | } |
4562 | |
4563 | bool addFieldInitializer(CXXCtorInitializer *Init) { |
4564 | AllToInit.push_back(Init); |
4565 | |
4566 | // Check whether this initializer makes the field "used". |
4567 | if (Init->getInit()->HasSideEffects(S.Context)) |
4568 | S.UnusedPrivateFields.remove(Init->getAnyMember()); |
4569 | |
4570 | return false; |
4571 | } |
4572 | |
4573 | bool isInactiveUnionMember(FieldDecl *Field) { |
4574 | RecordDecl *Record = Field->getParent(); |
4575 | if (!Record->isUnion()) |
4576 | return false; |
4577 | |
4578 | if (FieldDecl *Active = |
4579 | ActiveUnionMember.lookup(Record->getCanonicalDecl())) |
4580 | return Active != Field->getCanonicalDecl(); |
4581 | |
4582 | // In an implicit copy or move constructor, ignore any in-class initializer. |
4583 | if (isImplicitCopyOrMove()) |
4584 | return true; |
4585 | |
4586 | // If there's no explicit initialization, the field is active only if it |
4587 | // has an in-class initializer... |
4588 | if (Field->hasInClassInitializer()) |
4589 | return false; |
4590 | // ... or it's an anonymous struct or union whose class has an in-class |
4591 | // initializer. |
4592 | if (!Field->isAnonymousStructOrUnion()) |
4593 | return true; |
4594 | CXXRecordDecl *FieldRD = Field->getType()->getAsCXXRecordDecl(); |
4595 | return !FieldRD->hasInClassInitializer(); |
4596 | } |
4597 | |
4598 | /// Determine whether the given field is, or is within, a union member |
4599 | /// that is inactive (because there was an initializer given for a different |
4600 | /// member of the union, or because the union was not initialized at all). |
4601 | bool isWithinInactiveUnionMember(FieldDecl *Field, |
4602 | IndirectFieldDecl *Indirect) { |
4603 | if (!Indirect) |
4604 | return isInactiveUnionMember(Field); |
4605 | |
4606 | for (auto *C : Indirect->chain()) { |
4607 | FieldDecl *Field = dyn_cast<FieldDecl>(C); |
4608 | if (Field && isInactiveUnionMember(Field)) |
4609 | return true; |
4610 | } |
4611 | return false; |
4612 | } |
4613 | }; |
4614 | } |
4615 | |
4616 | /// Determine whether the given type is an incomplete or zero-lenfgth |
4617 | /// array type. |
4618 | static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { |
4619 | if (T->isIncompleteArrayType()) |
4620 | return true; |
4621 | |
4622 | while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { |
4623 | if (!ArrayT->getSize()) |
4624 | return true; |
4625 | |
4626 | T = ArrayT->getElementType(); |
4627 | } |
4628 | |
4629 | return false; |
4630 | } |
4631 | |
4632 | static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, |
4633 | FieldDecl *Field, |
4634 | IndirectFieldDecl *Indirect = nullptr) { |
4635 | if (Field->isInvalidDecl()) |
4636 | return false; |
4637 | |
4638 | // Overwhelmingly common case: we have a direct initializer for this field. |
4639 | if (CXXCtorInitializer *Init = |
4640 | Info.AllBaseFields.lookup(Field->getCanonicalDecl())) |
4641 | return Info.addFieldInitializer(Init); |
4642 | |
4643 | // C++11 [class.base.init]p8: |
4644 | // if the entity is a non-static data member that has a |
4645 | // brace-or-equal-initializer and either |
4646 | // -- the constructor's class is a union and no other variant member of that |
4647 | // union is designated by a mem-initializer-id or |
4648 | // -- the constructor's class is not a union, and, if the entity is a member |
4649 | // of an anonymous union, no other member of that union is designated by |
4650 | // a mem-initializer-id, |
4651 | // the entity is initialized as specified in [dcl.init]. |
4652 | // |
4653 | // We also apply the same rules to handle anonymous structs within anonymous |
4654 | // unions. |
4655 | if (Info.isWithinInactiveUnionMember(Field, Indirect)) |
4656 | return false; |
4657 | |
4658 | if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { |
4659 | ExprResult DIE = |
4660 | SemaRef.BuildCXXDefaultInitExpr(Info.Ctor->getLocation(), Field); |
4661 | if (DIE.isInvalid()) |
4662 | return true; |
4663 | |
4664 | auto Entity = InitializedEntity::InitializeMember(Field, nullptr, true); |
4665 | SemaRef.checkInitializerLifetime(Entity, DIE.get()); |
4666 | |
4667 | CXXCtorInitializer *Init; |
4668 | if (Indirect) |
4669 | Init = new (SemaRef.Context) |
4670 | CXXCtorInitializer(SemaRef.Context, Indirect, SourceLocation(), |
4671 | SourceLocation(), DIE.get(), SourceLocation()); |
4672 | else |
4673 | Init = new (SemaRef.Context) |
4674 | CXXCtorInitializer(SemaRef.Context, Field, SourceLocation(), |
4675 | SourceLocation(), DIE.get(), SourceLocation()); |
4676 | return Info.addFieldInitializer(Init); |
4677 | } |
4678 | |
4679 | // Don't initialize incomplete or zero-length arrays. |
4680 | if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) |
4681 | return false; |
4682 | |
4683 | // Don't try to build an implicit initializer if there were semantic |
4684 | // errors in any of the initializers (and therefore we might be |
4685 | // missing some that the user actually wrote). |
4686 | if (Info.AnyErrorsInInits) |
4687 | return false; |
4688 | |
4689 | CXXCtorInitializer *Init = nullptr; |
4690 | if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, |
4691 | Indirect, Init)) |
4692 | return true; |
4693 | |
4694 | if (!Init) |
4695 | return false; |
4696 | |
4697 | return Info.addFieldInitializer(Init); |
4698 | } |
4699 | |
4700 | bool |
4701 | Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, |
4702 | CXXCtorInitializer *Initializer) { |
4703 | assert(Initializer->isDelegatingInitializer())((Initializer->isDelegatingInitializer()) ? static_cast< void> (0) : __assert_fail ("Initializer->isDelegatingInitializer()" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 4703, __PRETTY_FUNCTION__)); |
4704 | Constructor->setNumCtorInitializers(1); |
4705 | CXXCtorInitializer **initializer = |
4706 | new (Context) CXXCtorInitializer*[1]; |
4707 | memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); |
4708 | Constructor->setCtorInitializers(initializer); |
4709 | |
4710 | if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { |
4711 | MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); |
4712 | DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); |
4713 | } |
4714 | |
4715 | DelegatingCtorDecls.push_back(Constructor); |
4716 | |
4717 | DiagnoseUninitializedFields(*this, Constructor); |
4718 | |
4719 | return false; |
4720 | } |
4721 | |
4722 | bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors, |
4723 | ArrayRef<CXXCtorInitializer *> Initializers) { |
4724 | if (Constructor->isDependentContext()) { |
4725 | // Just store the initializers as written, they will be checked during |
4726 | // instantiation. |
4727 | if (!Initializers.empty()) { |
4728 | Constructor->setNumCtorInitializers(Initializers.size()); |
4729 | CXXCtorInitializer **baseOrMemberInitializers = |
4730 | new (Context) CXXCtorInitializer*[Initializers.size()]; |
4731 | memcpy(baseOrMemberInitializers, Initializers.data(), |
4732 | Initializers.size() * sizeof(CXXCtorInitializer*)); |
4733 | Constructor->setCtorInitializers(baseOrMemberInitializers); |
4734 | } |
4735 | |
4736 | // Let template instantiation know whether we had errors. |
4737 | if (AnyErrors) |
4738 | Constructor->setInvalidDecl(); |
4739 | |
4740 | return false; |
4741 | } |
4742 | |
4743 | BaseAndFieldInfo Info(*this, Constructor, AnyErrors); |
4744 | |
4745 | // We need to build the initializer AST according to order of construction |
4746 | // and not what user specified in the Initializers list. |
4747 | CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); |
4748 | if (!ClassDecl) |
4749 | return true; |
4750 | |
4751 | bool HadError = false; |
4752 | |
4753 | for (unsigned i = 0; i < Initializers.size(); i++) { |
4754 | CXXCtorInitializer *Member = Initializers[i]; |
4755 | |
4756 | if (Member->isBaseInitializer()) |
4757 | Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; |
4758 | else { |
4759 | Info.AllBaseFields[Member->getAnyMember()->getCanonicalDecl()] = Member; |
4760 | |
4761 | if (IndirectFieldDecl *F = Member->getIndirectMember()) { |
4762 | for (auto *C : F->chain()) { |
4763 | FieldDecl *FD = dyn_cast<FieldDecl>(C); |
4764 | if (FD && FD->getParent()->isUnion()) |
4765 | Info.ActiveUnionMember.insert(std::make_pair( |
4766 | FD->getParent()->getCanonicalDecl(), FD->getCanonicalDecl())); |
4767 | } |
4768 | } else if (FieldDecl *FD = Member->getMember()) { |
4769 | if (FD->getParent()->isUnion()) |
4770 | Info.ActiveUnionMember.insert(std::make_pair( |
4771 | FD->getParent()->getCanonicalDecl(), FD->getCanonicalDecl())); |
4772 | } |
4773 | } |
4774 | } |
4775 | |
4776 | // Keep track of the direct virtual bases. |
4777 | llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; |
4778 | for (auto &I : ClassDecl->bases()) { |
4779 | if (I.isVirtual()) |
4780 | DirectVBases.insert(&I); |
4781 | } |
4782 | |
4783 | // Push virtual bases before others. |
4784 | for (auto &VBase : ClassDecl->vbases()) { |
4785 | if (CXXCtorInitializer *Value |
4786 | = Info.AllBaseFields.lookup(VBase.getType()->getAs<RecordType>())) { |
4787 | // [class.base.init]p7, per DR257: |
4788 | // A mem-initializer where the mem-initializer-id names a virtual base |
4789 | // class is ignored during execution of a constructor of any class that |
4790 | // is not the most derived class. |
4791 | if (ClassDecl->isAbstract()) { |
4792 | // FIXME: Provide a fixit to remove the base specifier. This requires |
4793 | // tracking the location of the associated comma for a base specifier. |
4794 | Diag(Value->getSourceLocation(), diag::warn_abstract_vbase_init_ignored) |
4795 | << VBase.getType() << ClassDecl; |
4796 | DiagnoseAbstractType(ClassDecl); |
4797 | } |
4798 | |
4799 | Info.AllToInit.push_back(Value); |
4800 | } else if (!AnyErrors && !ClassDecl->isAbstract()) { |
4801 | // [class.base.init]p8, per DR257: |
4802 | // If a given [...] base class is not named by a mem-initializer-id |
4803 | // [...] and the entity is not a virtual base class of an abstract |
4804 | // class, then [...] the entity is default-initialized. |
4805 | bool IsInheritedVirtualBase = !DirectVBases.count(&VBase); |
4806 | CXXCtorInitializer *CXXBaseInit; |
4807 | if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, |
4808 | &VBase, IsInheritedVirtualBase, |
4809 | CXXBaseInit)) { |
4810 | HadError = true; |
4811 | continue; |
4812 | } |
4813 | |
4814 | Info.AllToInit.push_back(CXXBaseInit); |
4815 | } |
4816 | } |
4817 | |
4818 | // Non-virtual bases. |
4819 | for (auto &Base : ClassDecl->bases()) { |
4820 | // Virtuals are in the virtual base list and already constructed. |
4821 | if (Base.isVirtual()) |
4822 | continue; |
4823 | |
4824 | if (CXXCtorInitializer *Value |
4825 | = Info.AllBaseFields.lookup(Base.getType()->getAs<RecordType>())) { |
4826 | Info.AllToInit.push_back(Value); |
4827 | } else if (!AnyErrors) { |
4828 | CXXCtorInitializer *CXXBaseInit; |
4829 | if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, |
4830 | &Base, /*IsInheritedVirtualBase=*/false, |
4831 | CXXBaseInit)) { |
4832 | HadError = true; |
4833 | continue; |
4834 | } |
4835 | |
4836 | Info.AllToInit.push_back(CXXBaseInit); |
4837 | } |
4838 | } |
4839 | |
4840 | // Fields. |
4841 | for (auto *Mem : ClassDecl->decls()) { |
4842 | if (auto *F = dyn_cast<FieldDecl>(Mem)) { |
4843 | // C++ [class.bit]p2: |
4844 | // A declaration for a bit-field that omits the identifier declares an |
4845 | // unnamed bit-field. Unnamed bit-fields are not members and cannot be |
4846 | // initialized. |
4847 | if (F->isUnnamedBitfield()) |
4848 | continue; |
4849 | |
4850 | // If we're not generating the implicit copy/move constructor, then we'll |
4851 | // handle anonymous struct/union fields based on their individual |
4852 | // indirect fields. |
4853 | if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove()) |
4854 | continue; |
4855 | |
4856 | if (CollectFieldInitializer(*this, Info, F)) |
4857 | HadError = true; |
4858 | continue; |
4859 | } |
4860 | |
4861 | // Beyond this point, we only consider default initialization. |
4862 | if (Info.isImplicitCopyOrMove()) |
4863 | continue; |
4864 | |
4865 | if (auto *F = dyn_cast<IndirectFieldDecl>(Mem)) { |
4866 | if (F->getType()->isIncompleteArrayType()) { |
4867 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 4868, __PRETTY_FUNCTION__)) |
4868 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 4868, __PRETTY_FUNCTION__)); |
4869 | continue; |
4870 | } |
4871 | |
4872 | // Initialize each field of an anonymous struct individually. |
4873 | if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) |
4874 | HadError = true; |
4875 | |
4876 | continue; |
4877 | } |
4878 | } |
4879 | |
4880 | unsigned NumInitializers = Info.AllToInit.size(); |
4881 | if (NumInitializers > 0) { |
4882 | Constructor->setNumCtorInitializers(NumInitializers); |
4883 | CXXCtorInitializer **baseOrMemberInitializers = |
4884 | new (Context) CXXCtorInitializer*[NumInitializers]; |
4885 | memcpy(baseOrMemberInitializers, Info.AllToInit.data(), |
4886 | NumInitializers * sizeof(CXXCtorInitializer*)); |
4887 | Constructor->setCtorInitializers(baseOrMemberInitializers); |
4888 | |
4889 | // Constructors implicitly reference the base and member |
4890 | // destructors. |
4891 | MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), |
4892 | Constructor->getParent()); |
4893 | } |
4894 | |
4895 | return HadError; |
4896 | } |
4897 | |
4898 | static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) { |
4899 | if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { |
4900 | const RecordDecl *RD = RT->getDecl(); |
4901 | if (RD->isAnonymousStructOrUnion()) { |
4902 | for (auto *Field : RD->fields()) |
4903 | PopulateKeysForFields(Field, IdealInits); |
4904 | return; |
4905 | } |
4906 | } |
4907 | IdealInits.push_back(Field->getCanonicalDecl()); |
4908 | } |
4909 | |
4910 | static const void *GetKeyForBase(ASTContext &Context, QualType BaseType) { |
4911 | return Context.getCanonicalType(BaseType).getTypePtr(); |
4912 | } |
4913 | |
4914 | static const void *GetKeyForMember(ASTContext &Context, |
4915 | CXXCtorInitializer *Member) { |
4916 | if (!Member->isAnyMemberInitializer()) |
4917 | return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); |
4918 | |
4919 | return Member->getAnyMember()->getCanonicalDecl(); |
4920 | } |
4921 | |
4922 | static void DiagnoseBaseOrMemInitializerOrder( |
4923 | Sema &SemaRef, const CXXConstructorDecl *Constructor, |
4924 | ArrayRef<CXXCtorInitializer *> Inits) { |
4925 | if (Constructor->getDeclContext()->isDependentContext()) |
4926 | return; |
4927 | |
4928 | // Don't check initializers order unless the warning is enabled at the |
4929 | // location of at least one initializer. |
4930 | bool ShouldCheckOrder = false; |
4931 | for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { |
4932 | CXXCtorInitializer *Init = Inits[InitIndex]; |
4933 | if (!SemaRef.Diags.isIgnored(diag::warn_initializer_out_of_order, |
4934 | Init->getSourceLocation())) { |
4935 | ShouldCheckOrder = true; |
4936 | break; |
4937 | } |
4938 | } |
4939 | if (!ShouldCheckOrder) |
4940 | return; |
4941 | |
4942 | // Build the list of bases and members in the order that they'll |
4943 | // actually be initialized. The explicit initializers should be in |
4944 | // this same order but may be missing things. |
4945 | SmallVector<const void*, 32> IdealInitKeys; |
4946 | |
4947 | const CXXRecordDecl *ClassDecl = Constructor->getParent(); |
4948 | |
4949 | // 1. Virtual bases. |
4950 | for (const auto &VBase : ClassDecl->vbases()) |
4951 | IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase.getType())); |
4952 | |
4953 | // 2. Non-virtual bases. |
4954 | for (const auto &Base : ClassDecl->bases()) { |
4955 | if (Base.isVirtual()) |
4956 | continue; |
4957 | IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base.getType())); |
4958 | } |
4959 | |
4960 | // 3. Direct fields. |
4961 | for (auto *Field : ClassDecl->fields()) { |
4962 | if (Field->isUnnamedBitfield()) |
4963 | continue; |
4964 | |
4965 | PopulateKeysForFields(Field, IdealInitKeys); |
4966 | } |
4967 | |
4968 | unsigned NumIdealInits = IdealInitKeys.size(); |
4969 | unsigned IdealIndex = 0; |
4970 | |
4971 | CXXCtorInitializer *PrevInit = nullptr; |
4972 | for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { |
4973 | CXXCtorInitializer *Init = Inits[InitIndex]; |
4974 | const void *InitKey = GetKeyForMember(SemaRef.Context, Init); |
4975 | |
4976 | // Scan forward to try to find this initializer in the idealized |
4977 | // initializers list. |
4978 | for (; IdealIndex != NumIdealInits; ++IdealIndex) |
4979 | if (InitKey == IdealInitKeys[IdealIndex]) |
4980 | break; |
4981 | |
4982 | // If we didn't find this initializer, it must be because we |
4983 | // scanned past it on a previous iteration. That can only |
4984 | // happen if we're out of order; emit a warning. |
4985 | if (IdealIndex == NumIdealInits && PrevInit) { |
4986 | Sema::SemaDiagnosticBuilder D = |
4987 | SemaRef.Diag(PrevInit->getSourceLocation(), |
4988 | diag::warn_initializer_out_of_order); |
4989 | |
4990 | if (PrevInit->isAnyMemberInitializer()) |
4991 | D << 0 << PrevInit->getAnyMember()->getDeclName(); |
4992 | else |
4993 | D << 1 << PrevInit->getTypeSourceInfo()->getType(); |
4994 | |
4995 | if (Init->isAnyMemberInitializer()) |
4996 | D << 0 << Init->getAnyMember()->getDeclName(); |
4997 | else |
4998 | D << 1 << Init->getTypeSourceInfo()->getType(); |
4999 | |
5000 | // Move back to the initializer's location in the ideal list. |
5001 | for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) |
5002 | if (InitKey == IdealInitKeys[IdealIndex]) |
5003 | break; |
5004 | |
5005 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 5006, __PRETTY_FUNCTION__)) |
5006 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 5006, __PRETTY_FUNCTION__)); |
5007 | } |
5008 | |
5009 | PrevInit = Init; |
5010 | } |
5011 | } |
5012 | |
5013 | namespace { |
5014 | bool CheckRedundantInit(Sema &S, |
5015 | CXXCtorInitializer *Init, |
5016 | CXXCtorInitializer *&PrevInit) { |
5017 | if (!PrevInit) { |
5018 | PrevInit = Init; |
5019 | return false; |
5020 | } |
5021 | |
5022 | if (FieldDecl *Field = Init->getAnyMember()) |
5023 | S.Diag(Init->getSourceLocation(), |
5024 | diag::err_multiple_mem_initialization) |
5025 | << Field->getDeclName() |
5026 | << Init->getSourceRange(); |
5027 | else { |
5028 | const Type *BaseClass = Init->getBaseClass(); |
5029 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 5029, __PRETTY_FUNCTION__)); |
5030 | S.Diag(Init->getSourceLocation(), |
5031 | diag::err_multiple_base_initialization) |
5032 | << QualType(BaseClass, 0) |
5033 | << Init->getSourceRange(); |
5034 | } |
5035 | S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) |
5036 | << 0 << PrevInit->getSourceRange(); |
5037 | |
5038 | return true; |
5039 | } |
5040 | |
5041 | typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; |
5042 | typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; |
5043 | |
5044 | bool CheckRedundantUnionInit(Sema &S, |
5045 | CXXCtorInitializer *Init, |
5046 | RedundantUnionMap &Unions) { |
5047 | FieldDecl *Field = Init->getAnyMember(); |
5048 | RecordDecl *Parent = Field->getParent(); |
5049 | NamedDecl *Child = Field; |
5050 | |
5051 | while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { |
5052 | if (Parent->isUnion()) { |
5053 | UnionEntry &En = Unions[Parent]; |
5054 | if (En.first && En.first != Child) { |
5055 | S.Diag(Init->getSourceLocation(), |
5056 | diag::err_multiple_mem_union_initialization) |
5057 | << Field->getDeclName() |
5058 | << Init->getSourceRange(); |
5059 | S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) |
5060 | << 0 << En.second->getSourceRange(); |
5061 | return true; |
5062 | } |
5063 | if (!En.first) { |
5064 | En.first = Child; |
5065 | En.second = Init; |
5066 | } |
5067 | if (!Parent->isAnonymousStructOrUnion()) |
5068 | return false; |
5069 | } |
5070 | |
5071 | Child = Parent; |
5072 | Parent = cast<RecordDecl>(Parent->getDeclContext()); |
5073 | } |
5074 | |
5075 | return false; |
5076 | } |
5077 | } |
5078 | |
5079 | /// ActOnMemInitializers - Handle the member initializers for a constructor. |
5080 | void Sema::ActOnMemInitializers(Decl *ConstructorDecl, |
5081 | SourceLocation ColonLoc, |
5082 | ArrayRef<CXXCtorInitializer*> MemInits, |
5083 | bool AnyErrors) { |
5084 | if (!ConstructorDecl) |
5085 | return; |
5086 | |
5087 | AdjustDeclIfTemplate(ConstructorDecl); |
5088 | |
5089 | CXXConstructorDecl *Constructor |
5090 | = dyn_cast<CXXConstructorDecl>(ConstructorDecl); |
5091 | |
5092 | if (!Constructor) { |
5093 | Diag(ColonLoc, diag::err_only_constructors_take_base_inits); |
5094 | return; |
5095 | } |
5096 | |
5097 | // Mapping for the duplicate initializers check. |
5098 | // For member initializers, this is keyed with a FieldDecl*. |
5099 | // For base initializers, this is keyed with a Type*. |
5100 | llvm::DenseMap<const void *, CXXCtorInitializer *> Members; |
5101 | |
5102 | // Mapping for the inconsistent anonymous-union initializers check. |
5103 | RedundantUnionMap MemberUnions; |
5104 | |
5105 | bool HadError = false; |
5106 | for (unsigned i = 0; i < MemInits.size(); i++) { |
5107 | CXXCtorInitializer *Init = MemInits[i]; |
5108 | |
5109 | // Set the source order index. |
5110 | Init->setSourceOrder(i); |
5111 | |
5112 | if (Init->isAnyMemberInitializer()) { |
5113 | const void *Key = GetKeyForMember(Context, Init); |
5114 | if (CheckRedundantInit(*this, Init, Members[Key]) || |
5115 | CheckRedundantUnionInit(*this, Init, MemberUnions)) |
5116 | HadError = true; |
5117 | } else if (Init->isBaseInitializer()) { |
5118 | const void *Key = GetKeyForMember(Context, Init); |
5119 | if (CheckRedundantInit(*this, Init, Members[Key])) |
5120 | HadError = true; |
5121 | } else { |
5122 | assert(Init->isDelegatingInitializer())((Init->isDelegatingInitializer()) ? static_cast<void> (0) : __assert_fail ("Init->isDelegatingInitializer()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 5122, __PRETTY_FUNCTION__)); |
5123 | // This must be the only initializer |
5124 | if (MemInits.size() != 1) { |
5125 | Diag(Init->getSourceLocation(), |
5126 | diag::err_delegating_initializer_alone) |
5127 | << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); |
5128 | // We will treat this as being the only initializer. |
5129 | } |
5130 | SetDelegatingInitializer(Constructor, MemInits[i]); |
5131 | // Return immediately as the initializer is set. |
5132 | return; |
5133 | } |
5134 | } |
5135 | |
5136 | if (HadError) |
5137 | return; |
5138 | |
5139 | DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits); |
5140 | |
5141 | SetCtorInitializers(Constructor, AnyErrors, MemInits); |
5142 | |
5143 | DiagnoseUninitializedFields(*this, Constructor); |
5144 | } |
5145 | |
5146 | void |
5147 | Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, |
5148 | CXXRecordDecl *ClassDecl) { |
5149 | // Ignore dependent contexts. Also ignore unions, since their members never |
5150 | // have destructors implicitly called. |
5151 | if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) |
5152 | return; |
5153 | |
5154 | // FIXME: all the access-control diagnostics are positioned on the |
5155 | // field/base declaration. That's probably good; that said, the |
5156 | // user might reasonably want to know why the destructor is being |
5157 | // emitted, and we currently don't say. |
5158 | |
5159 | // Non-static data members. |
5160 | for (auto *Field : ClassDecl->fields()) { |
5161 | if (Field->isInvalidDecl()) |
5162 | continue; |
5163 | |
5164 | // Don't destroy incomplete or zero-length arrays. |
5165 | if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) |
5166 | continue; |
5167 | |
5168 | QualType FieldType = Context.getBaseElementType(Field->getType()); |
5169 | |
5170 | const RecordType* RT = FieldType->getAs<RecordType>(); |
5171 | if (!RT) |
5172 | continue; |
5173 | |
5174 | CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); |
5175 | if (FieldClassDecl->isInvalidDecl()) |
5176 | continue; |
5177 | if (FieldClassDecl->hasIrrelevantDestructor()) |
5178 | continue; |
5179 | // The destructor for an implicit anonymous union member is never invoked. |
5180 | if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) |
5181 | continue; |
5182 | |
5183 | CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); |
5184 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 5184, __PRETTY_FUNCTION__)); |
5185 | CheckDestructorAccess(Field->getLocation(), Dtor, |
5186 | PDiag(diag::err_access_dtor_field) |
5187 | << Field->getDeclName() |
5188 | << FieldType); |
5189 | |
5190 | MarkFunctionReferenced(Location, Dtor); |
5191 | DiagnoseUseOfDecl(Dtor, Location); |
5192 | } |
5193 | |
5194 | // We only potentially invoke the destructors of potentially constructed |
5195 | // subobjects. |
5196 | bool VisitVirtualBases = !ClassDecl->isAbstract(); |
5197 | |
5198 | llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; |
5199 | |
5200 | // Bases. |
5201 | for (const auto &Base : ClassDecl->bases()) { |
5202 | // Bases are always records in a well-formed non-dependent class. |
5203 | const RecordType *RT = Base.getType()->getAs<RecordType>(); |
5204 | |
5205 | // Remember direct virtual bases. |
5206 | if (Base.isVirtual()) { |
5207 | if (!VisitVirtualBases) |
5208 | continue; |
5209 | DirectVirtualBases.insert(RT); |
5210 | } |
5211 | |
5212 | CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); |
5213 | // If our base class is invalid, we probably can't get its dtor anyway. |
5214 | if (BaseClassDecl->isInvalidDecl()) |
5215 | continue; |
5216 | if (BaseClassDecl->hasIrrelevantDestructor()) |
5217 | continue; |
5218 | |
5219 | CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); |
5220 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 5220, __PRETTY_FUNCTION__)); |
5221 | |
5222 | // FIXME: caret should be on the start of the class name |
5223 | CheckDestructorAccess(Base.getBeginLoc(), Dtor, |
5224 | PDiag(diag::err_access_dtor_base) |
5225 | << Base.getType() << Base.getSourceRange(), |
5226 | Context.getTypeDeclType(ClassDecl)); |
5227 | |
5228 | MarkFunctionReferenced(Location, Dtor); |
5229 | DiagnoseUseOfDecl(Dtor, Location); |
5230 | } |
5231 | |
5232 | if (!VisitVirtualBases) |
5233 | return; |
5234 | |
5235 | // Virtual bases. |
5236 | for (const auto &VBase : ClassDecl->vbases()) { |
5237 | // Bases are always records in a well-formed non-dependent class. |
5238 | const RecordType *RT = VBase.getType()->castAs<RecordType>(); |
5239 | |
5240 | // Ignore direct virtual bases. |
5241 | if (DirectVirtualBases.count(RT)) |
5242 | continue; |
5243 | |
5244 | CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); |
5245 | // If our base class is invalid, we probably can't get its dtor anyway. |
5246 | if (BaseClassDecl->isInvalidDecl()) |
5247 | continue; |
5248 | if (BaseClassDecl->hasIrrelevantDestructor()) |
5249 | continue; |
5250 | |
5251 | CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); |
5252 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 5252, __PRETTY_FUNCTION__)); |
5253 | if (CheckDestructorAccess( |
5254 | ClassDecl->getLocation(), Dtor, |
5255 | PDiag(diag::err_access_dtor_vbase) |
5256 | << Context.getTypeDeclType(ClassDecl) << VBase.getType(), |
5257 | Context.getTypeDeclType(ClassDecl)) == |
5258 | AR_accessible) { |
5259 | CheckDerivedToBaseConversion( |
5260 | Context.getTypeDeclType(ClassDecl), VBase.getType(), |
5261 | diag::err_access_dtor_vbase, 0, ClassDecl->getLocation(), |
5262 | SourceRange(), DeclarationName(), nullptr); |
5263 | } |
5264 | |
5265 | MarkFunctionReferenced(Location, Dtor); |
5266 | DiagnoseUseOfDecl(Dtor, Location); |
5267 | } |
5268 | } |
5269 | |
5270 | void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { |
5271 | if (!CDtorDecl) |
5272 | return; |
5273 | |
5274 | if (CXXConstructorDecl *Constructor |
5275 | = dyn_cast<CXXConstructorDecl>(CDtorDecl)) { |
5276 | SetCtorInitializers(Constructor, /*AnyErrors=*/false); |
5277 | DiagnoseUninitializedFields(*this, Constructor); |
5278 | } |
5279 | } |
5280 | |
5281 | bool Sema::isAbstractType(SourceLocation Loc, QualType T) { |
5282 | if (!getLangOpts().CPlusPlus) |
5283 | return false; |
5284 | |
5285 | const auto *RD = Context.getBaseElementType(T)->getAsCXXRecordDecl(); |
5286 | if (!RD) |
5287 | return false; |
5288 | |
5289 | // FIXME: Per [temp.inst]p1, we are supposed to trigger instantiation of a |
5290 | // class template specialization here, but doing so breaks a lot of code. |
5291 | |
5292 | // We can't answer whether something is abstract until it has a |
5293 | // definition. If it's currently being defined, we'll walk back |
5294 | // over all the declarations when we have a full definition. |
5295 | const CXXRecordDecl *Def = RD->getDefinition(); |
5296 | if (!Def || Def->isBeingDefined()) |
5297 | return false; |
5298 | |
5299 | return RD->isAbstract(); |
5300 | } |
5301 | |
5302 | bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, |
5303 | TypeDiagnoser &Diagnoser) { |
5304 | if (!isAbstractType(Loc, T)) |
5305 | return false; |
5306 | |
5307 | T = Context.getBaseElementType(T); |
5308 | Diagnoser.diagnose(*this, Loc, T); |
5309 | DiagnoseAbstractType(T->getAsCXXRecordDecl()); |
5310 | return true; |
5311 | } |
5312 | |
5313 | void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { |
5314 | // Check if we've already emitted the list of pure virtual functions |
5315 | // for this class. |
5316 | if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) |
5317 | return; |
5318 | |
5319 | // If the diagnostic is suppressed, don't emit the notes. We're only |
5320 | // going to emit them once, so try to attach them to a diagnostic we're |
5321 | // actually going to show. |
5322 | if (Diags.isLastDiagnosticIgnored()) |
5323 | return; |
5324 | |
5325 | CXXFinalOverriderMap FinalOverriders; |
5326 | RD->getFinalOverriders(FinalOverriders); |
5327 | |
5328 | // Keep a set of seen pure methods so we won't diagnose the same method |
5329 | // more than once. |
5330 | llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; |
5331 | |
5332 | for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), |
5333 | MEnd = FinalOverriders.end(); |
5334 | M != MEnd; |
5335 | ++M) { |
5336 | for (OverridingMethods::iterator SO = M->second.begin(), |
5337 | SOEnd = M->second.end(); |
5338 | SO != SOEnd; ++SO) { |
5339 | // C++ [class.abstract]p4: |
5340 | // A class is abstract if it contains or inherits at least one |
5341 | // pure virtual function for which the final overrider is pure |
5342 | // virtual. |
5343 | |
5344 | // |
5345 | if (SO->second.size() != 1) |
5346 | continue; |
5347 | |
5348 | if (!SO->second.front().Method->isPure()) |
5349 | continue; |
5350 | |
5351 | if (!SeenPureMethods.insert(SO->second.front().Method).second) |
5352 | continue; |
5353 | |
5354 | Diag(SO->second.front().Method->getLocation(), |
5355 | diag::note_pure_virtual_function) |
5356 | << SO->second.front().Method->getDeclName() << RD->getDeclName(); |
5357 | } |
5358 | } |
5359 | |
5360 | if (!PureVirtualClassDiagSet) |
5361 | PureVirtualClassDiagSet.reset(new RecordDeclSetTy); |
5362 | PureVirtualClassDiagSet->insert(RD); |
5363 | } |
5364 | |
5365 | namespace { |
5366 | struct AbstractUsageInfo { |
5367 | Sema &S; |
5368 | CXXRecordDecl *Record; |
5369 | CanQualType AbstractType; |
5370 | bool Invalid; |
5371 | |
5372 | AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) |
5373 | : S(S), Record(Record), |
5374 | AbstractType(S.Context.getCanonicalType( |
5375 | S.Context.getTypeDeclType(Record))), |
5376 | Invalid(false) {} |
5377 | |
5378 | void DiagnoseAbstractType() { |
5379 | if (Invalid) return; |
5380 | S.DiagnoseAbstractType(Record); |
5381 | Invalid = true; |
5382 | } |
5383 | |
5384 | void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); |
5385 | }; |
5386 | |
5387 | struct CheckAbstractUsage { |
5388 | AbstractUsageInfo &Info; |
5389 | const NamedDecl *Ctx; |
5390 | |
5391 | CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) |
5392 | : Info(Info), Ctx(Ctx) {} |
5393 | |
5394 | void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { |
5395 | switch (TL.getTypeLocClass()) { |
5396 | #define ABSTRACT_TYPELOC(CLASS, PARENT) |
5397 | #define TYPELOC(CLASS, PARENT) \ |
5398 | case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break; |
5399 | #include "clang/AST/TypeLocNodes.def" |
5400 | } |
5401 | } |
5402 | |
5403 | void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { |
5404 | Visit(TL.getReturnLoc(), Sema::AbstractReturnType); |
5405 | for (unsigned I = 0, E = TL.getNumParams(); I != E; ++I) { |
5406 | if (!TL.getParam(I)) |
5407 | continue; |
5408 | |
5409 | TypeSourceInfo *TSI = TL.getParam(I)->getTypeSourceInfo(); |
5410 | if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); |
5411 | } |
5412 | } |
5413 | |
5414 | void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { |
5415 | Visit(TL.getElementLoc(), Sema::AbstractArrayType); |
5416 | } |
5417 | |
5418 | void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { |
5419 | // Visit the type parameters from a permissive context. |
5420 | for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { |
5421 | TemplateArgumentLoc TAL = TL.getArgLoc(I); |
5422 | if (TAL.getArgument().getKind() == TemplateArgument::Type) |
5423 | if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) |
5424 | Visit(TSI->getTypeLoc(), Sema::AbstractNone); |
5425 | // TODO: other template argument types? |
5426 | } |
5427 | } |
5428 | |
5429 | // Visit pointee types from a permissive context. |
5430 | #define CheckPolymorphic(Type)void Check(Type TL, Sema::AbstractDiagSelID Sel) { Visit(TL.getNextTypeLoc (), Sema::AbstractNone); } \ |
5431 | void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ |
5432 | Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ |
5433 | } |
5434 | CheckPolymorphic(PointerTypeLoc)void Check(PointerTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit (TL.getNextTypeLoc(), Sema::AbstractNone); } |
5435 | CheckPolymorphic(ReferenceTypeLoc)void Check(ReferenceTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); } |
5436 | CheckPolymorphic(MemberPointerTypeLoc)void Check(MemberPointerTypeLoc TL, Sema::AbstractDiagSelID Sel ) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); } |
5437 | CheckPolymorphic(BlockPointerTypeLoc)void Check(BlockPointerTypeLoc TL, Sema::AbstractDiagSelID Sel ) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); } |
5438 | CheckPolymorphic(AtomicTypeLoc)void Check(AtomicTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit (TL.getNextTypeLoc(), Sema::AbstractNone); } |
5439 | |
5440 | /// Handle all the types we haven't given a more specific |
5441 | /// implementation for above. |
5442 | void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { |
5443 | // Every other kind of type that we haven't called out already |
5444 | // that has an inner type is either (1) sugar or (2) contains that |
5445 | // inner type in some way as a subobject. |
5446 | if (TypeLoc Next = TL.getNextTypeLoc()) |
5447 | return Visit(Next, Sel); |
5448 | |
5449 | // If there's no inner type and we're in a permissive context, |
5450 | // don't diagnose. |
5451 | if (Sel == Sema::AbstractNone) return; |
5452 | |
5453 | // Check whether the type matches the abstract type. |
5454 | QualType T = TL.getType(); |
5455 | if (T->isArrayType()) { |
5456 | Sel = Sema::AbstractArrayType; |
5457 | T = Info.S.Context.getBaseElementType(T); |
5458 | } |
5459 | CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); |
5460 | if (CT != Info.AbstractType) return; |
5461 | |
5462 | // It matched; do some magic. |
5463 | if (Sel == Sema::AbstractArrayType) { |
5464 | Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) |
5465 | << T << TL.getSourceRange(); |
5466 | } else { |
5467 | Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) |
5468 | << Sel << T << TL.getSourceRange(); |
5469 | } |
5470 | Info.DiagnoseAbstractType(); |
5471 | } |
5472 | }; |
5473 | |
5474 | void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, |
5475 | Sema::AbstractDiagSelID Sel) { |
5476 | CheckAbstractUsage(*this, D).Visit(TL, Sel); |
5477 | } |
5478 | |
5479 | } |
5480 | |
5481 | /// Check for invalid uses of an abstract type in a method declaration. |
5482 | static void CheckAbstractClassUsage(AbstractUsageInfo &Info, |
5483 | CXXMethodDecl *MD) { |
5484 | // No need to do the check on definitions, which require that |
5485 | // the return/param types be complete. |
5486 | if (MD->doesThisDeclarationHaveABody()) |
5487 | return; |
5488 | |
5489 | // For safety's sake, just ignore it if we don't have type source |
5490 | // information. This should never happen for non-implicit methods, |
5491 | // but... |
5492 | if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) |
5493 | Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); |
5494 | } |
5495 | |
5496 | /// Check for invalid uses of an abstract type within a class definition. |
5497 | static void CheckAbstractClassUsage(AbstractUsageInfo &Info, |
5498 | CXXRecordDecl *RD) { |
5499 | for (auto *D : RD->decls()) { |
5500 | if (D->isImplicit()) continue; |
5501 | |
5502 | // Methods and method templates. |
5503 | if (isa<CXXMethodDecl>(D)) { |
5504 | CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); |
5505 | } else if (isa<FunctionTemplateDecl>(D)) { |
5506 | FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); |
5507 | CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); |
5508 | |
5509 | // Fields and static variables. |
5510 | } else if (isa<FieldDecl>(D)) { |
5511 | FieldDecl *FD = cast<FieldDecl>(D); |
5512 | if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) |
5513 | Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); |
5514 | } else if (isa<VarDecl>(D)) { |
5515 | VarDecl *VD = cast<VarDecl>(D); |
5516 | if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) |
5517 | Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); |
5518 | |
5519 | // Nested classes and class templates. |
5520 | } else if (isa<CXXRecordDecl>(D)) { |
5521 | CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); |
5522 | } else if (isa<ClassTemplateDecl>(D)) { |
5523 | CheckAbstractClassUsage(Info, |
5524 | cast<ClassTemplateDecl>(D)->getTemplatedDecl()); |
5525 | } |
5526 | } |
5527 | } |
5528 | |
5529 | static void ReferenceDllExportedMembers(Sema &S, CXXRecordDecl *Class) { |
5530 | Attr *ClassAttr = getDLLAttr(Class); |
5531 | if (!ClassAttr) |
5532 | return; |
5533 | |
5534 | assert(ClassAttr->getKind() == attr::DLLExport)((ClassAttr->getKind() == attr::DLLExport) ? static_cast< void> (0) : __assert_fail ("ClassAttr->getKind() == attr::DLLExport" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 5534, __PRETTY_FUNCTION__)); |
5535 | |
5536 | TemplateSpecializationKind TSK = Class->getTemplateSpecializationKind(); |
5537 | |
5538 | if (TSK == TSK_ExplicitInstantiationDeclaration) |
5539 | // Don't go any further if this is just an explicit instantiation |
5540 | // declaration. |
5541 | return; |
5542 | |
5543 | if (S.Context.getTargetInfo().getTriple().isWindowsGNUEnvironment()) |
5544 | S.MarkVTableUsed(Class->getLocation(), Class, true); |
5545 | |
5546 | for (Decl *Member : Class->decls()) { |
5547 | // Defined static variables that are members of an exported base |
5548 | // class must be marked export too. |
5549 | auto *VD = dyn_cast<VarDecl>(Member); |
5550 | if (VD && Member->getAttr<DLLExportAttr>() && |
5551 | VD->getStorageClass() == SC_Static && |
5552 | TSK == TSK_ImplicitInstantiation) |
5553 | S.MarkVariableReferenced(VD->getLocation(), VD); |
5554 | |
5555 | auto *MD = dyn_cast<CXXMethodDecl>(Member); |
5556 | if (!MD) |
5557 | continue; |
5558 | |
5559 | if (Member->getAttr<DLLExportAttr>()) { |
5560 | if (MD->isUserProvided()) { |
5561 | // Instantiate non-default class member functions ... |
5562 | |
5563 | // .. except for certain kinds of template specializations. |
5564 | if (TSK == TSK_ImplicitInstantiation && !ClassAttr->isInherited()) |
5565 | continue; |
5566 | |
5567 | S.MarkFunctionReferenced(Class->getLocation(), MD); |
5568 | |
5569 | // The function will be passed to the consumer when its definition is |
5570 | // encountered. |
5571 | } else if (!MD->isTrivial() || MD->isExplicitlyDefaulted() || |
5572 | MD->isCopyAssignmentOperator() || |
5573 | MD->isMoveAssignmentOperator()) { |
5574 | // Synthesize and instantiate non-trivial implicit methods, explicitly |
5575 | // defaulted methods, and the copy and move assignment operators. The |
5576 | // latter are exported even if they are trivial, because the address of |
5577 | // an operator can be taken and should compare equal across libraries. |
5578 | DiagnosticErrorTrap Trap(S.Diags); |
5579 | S.MarkFunctionReferenced(Class->getLocation(), MD); |
5580 | if (Trap.hasErrorOccurred()) { |
5581 | S.Diag(ClassAttr->getLocation(), diag::note_due_to_dllexported_class) |
5582 | << Class << !S.getLangOpts().CPlusPlus11; |
5583 | break; |
5584 | } |
5585 | |
5586 | // There is no later point when we will see the definition of this |
5587 | // function, so pass it to the consumer now. |
5588 | S.Consumer.HandleTopLevelDecl(DeclGroupRef(MD)); |
5589 | } |
5590 | } |
5591 | } |
5592 | } |
5593 | |
5594 | static void checkForMultipleExportedDefaultConstructors(Sema &S, |
5595 | CXXRecordDecl *Class) { |
5596 | // Only the MS ABI has default constructor closures, so we don't need to do |
5597 | // this semantic checking anywhere else. |
5598 | if (!S.Context.getTargetInfo().getCXXABI().isMicrosoft()) |
5599 | return; |
5600 | |
5601 | CXXConstructorDecl *LastExportedDefaultCtor = nullptr; |
5602 | for (Decl *Member : Class->decls()) { |
5603 | // Look for exported default constructors. |
5604 | auto *CD = dyn_cast<CXXConstructorDecl>(Member); |
5605 | if (!CD || !CD->isDefaultConstructor()) |
5606 | continue; |
5607 | auto *Attr = CD->getAttr<DLLExportAttr>(); |
5608 | if (!Attr) |
5609 | continue; |
5610 | |
5611 | // If the class is non-dependent, mark the default arguments as ODR-used so |
5612 | // that we can properly codegen the constructor closure. |
5613 | if (!Class->isDependentContext()) { |
5614 | for (ParmVarDecl *PD : CD->parameters()) { |
5615 | (void)S.CheckCXXDefaultArgExpr(Attr->getLocation(), CD, PD); |
5616 | S.DiscardCleanupsInEvaluationContext(); |
5617 | } |
5618 | } |
5619 | |
5620 | if (LastExportedDefaultCtor) { |
5621 | S.Diag(LastExportedDefaultCtor->getLocation(), |
5622 | diag::err_attribute_dll_ambiguous_default_ctor) |
5623 | << Class; |
5624 | S.Diag(CD->getLocation(), diag::note_entity_declared_at) |
5625 | << CD->getDeclName(); |
5626 | return; |
5627 | } |
5628 | LastExportedDefaultCtor = CD; |
5629 | } |
5630 | } |
5631 | |
5632 | void Sema::checkClassLevelCodeSegAttribute(CXXRecordDecl *Class) { |
5633 | // Mark any compiler-generated routines with the implicit code_seg attribute. |
5634 | for (auto *Method : Class->methods()) { |
5635 | if (Method->isUserProvided()) |
5636 | continue; |
5637 | if (Attr *A = getImplicitCodeSegOrSectionAttrForFunction(Method, /*IsDefinition=*/true)) |
5638 | Method->addAttr(A); |
5639 | } |
5640 | } |
5641 | |
5642 | /// Check class-level dllimport/dllexport attribute. |
5643 | void Sema::checkClassLevelDLLAttribute(CXXRecordDecl *Class) { |
5644 | Attr *ClassAttr = getDLLAttr(Class); |
5645 | |
5646 | // MSVC inherits DLL attributes to partial class template specializations. |
5647 | if (Context.getTargetInfo().getCXXABI().isMicrosoft() && !ClassAttr) { |
5648 | if (auto *Spec = dyn_cast<ClassTemplatePartialSpecializationDecl>(Class)) { |
5649 | if (Attr *TemplateAttr = |
5650 | getDLLAttr(Spec->getSpecializedTemplate()->getTemplatedDecl())) { |
5651 | auto *A = cast<InheritableAttr>(TemplateAttr->clone(getASTContext())); |
5652 | A->setInherited(true); |
5653 | ClassAttr = A; |
5654 | } |
5655 | } |
5656 | } |
5657 | |
5658 | if (!ClassAttr) |
5659 | return; |
5660 | |
5661 | if (!Class->isExternallyVisible()) { |
5662 | Diag(Class->getLocation(), diag::err_attribute_dll_not_extern) |
5663 | << Class << ClassAttr; |
5664 | return; |
5665 | } |
5666 | |
5667 | if (Context.getTargetInfo().getCXXABI().isMicrosoft() && |
5668 | !ClassAttr->isInherited()) { |
5669 | // Diagnose dll attributes on members of class with dll attribute. |
5670 | for (Decl *Member : Class->decls()) { |
5671 | if (!isa<VarDecl>(Member) && !isa<CXXMethodDecl>(Member)) |
5672 | continue; |
5673 | InheritableAttr *MemberAttr = getDLLAttr(Member); |
5674 | if (!MemberAttr || MemberAttr->isInherited() || Member->isInvalidDecl()) |
5675 | continue; |
5676 | |
5677 | Diag(MemberAttr->getLocation(), |
5678 | diag::err_attribute_dll_member_of_dll_class) |
5679 | << MemberAttr << ClassAttr; |
5680 | Diag(ClassAttr->getLocation(), diag::note_previous_attribute); |
5681 | Member->setInvalidDecl(); |
5682 | } |
5683 | } |
5684 | |
5685 | if (Class->getDescribedClassTemplate()) |
5686 | // Don't inherit dll attribute until the template is instantiated. |
5687 | return; |
5688 | |
5689 | // The class is either imported or exported. |
5690 | const bool ClassExported = ClassAttr->getKind() == attr::DLLExport; |
5691 | |
5692 | // Check if this was a dllimport attribute propagated from a derived class to |
5693 | // a base class template specialization. We don't apply these attributes to |
5694 | // static data members. |
5695 | const bool PropagatedImport = |
5696 | !ClassExported && |
5697 | cast<DLLImportAttr>(ClassAttr)->wasPropagatedToBaseTemplate(); |
5698 | |
5699 | TemplateSpecializationKind TSK = Class->getTemplateSpecializationKind(); |
5700 | |
5701 | // Ignore explicit dllexport on explicit class template instantiation |
5702 | // declarations, except in MinGW mode. |
5703 | if (ClassExported && !ClassAttr->isInherited() && |
5704 | TSK == TSK_ExplicitInstantiationDeclaration && |
5705 | !Context.getTargetInfo().getTriple().isWindowsGNUEnvironment()) { |
5706 | Class->dropAttr<DLLExportAttr>(); |
5707 | return; |
5708 | } |
5709 | |
5710 | // Force declaration of implicit members so they can inherit the attribute. |
5711 | ForceDeclarationOfImplicitMembers(Class); |
5712 | |
5713 | // FIXME: MSVC's docs say all bases must be exportable, but this doesn't |
5714 | // seem to be true in practice? |
5715 | |
5716 | for (Decl *Member : Class->decls()) { |
5717 | VarDecl *VD = dyn_cast<VarDecl>(Member); |
5718 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); |
5719 | |
5720 | // Only methods and static fields inherit the attributes. |
5721 | if (!VD && !MD) |
5722 | continue; |
5723 | |
5724 | if (MD) { |
5725 | // Don't process deleted methods. |
5726 | if (MD->isDeleted()) |
5727 | continue; |
5728 | |
5729 | if (MD->isInlined()) { |
5730 | // MinGW does not import or export inline methods. But do it for |
5731 | // template instantiations. |
5732 | if (!Context.getTargetInfo().getCXXABI().isMicrosoft() && |
5733 | !Context.getTargetInfo().getTriple().isWindowsItaniumEnvironment() && |
5734 | TSK != TSK_ExplicitInstantiationDeclaration && |
5735 | TSK != TSK_ExplicitInstantiationDefinition) |
5736 | continue; |
5737 | |
5738 | // MSVC versions before 2015 don't export the move assignment operators |
5739 | // and move constructor, so don't attempt to import/export them if |
5740 | // we have a definition. |
5741 | auto *Ctor = dyn_cast<CXXConstructorDecl>(MD); |
5742 | if ((MD->isMoveAssignmentOperator() || |
5743 | (Ctor && Ctor->isMoveConstructor())) && |
5744 | !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015)) |
5745 | continue; |
5746 | |
5747 | // MSVC2015 doesn't export trivial defaulted x-tor but copy assign |
5748 | // operator is exported anyway. |
5749 | if (getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015) && |
5750 | (Ctor || isa<CXXDestructorDecl>(MD)) && MD->isTrivial()) |
5751 | continue; |
5752 | } |
5753 | } |
5754 | |
5755 | // Don't apply dllimport attributes to static data members of class template |
5756 | // instantiations when the attribute is propagated from a derived class. |
5757 | if (VD && PropagatedImport) |
5758 | continue; |
5759 | |
5760 | if (!cast<NamedDecl>(Member)->isExternallyVisible()) |
5761 | continue; |
5762 | |
5763 | if (!getDLLAttr(Member)) { |
5764 | InheritableAttr *NewAttr = nullptr; |
5765 | |
5766 | // Do not export/import inline function when -fno-dllexport-inlines is |
5767 | // passed. But add attribute for later local static var check. |
5768 | if (!getLangOpts().DllExportInlines && MD && MD->isInlined() && |
5769 | TSK != TSK_ExplicitInstantiationDeclaration && |
5770 | TSK != TSK_ExplicitInstantiationDefinition) { |
5771 | if (ClassExported) { |
5772 | NewAttr = ::new (getASTContext()) |
5773 | DLLExportStaticLocalAttr(ClassAttr->getRange(), |
5774 | getASTContext(), |
5775 | ClassAttr->getSpellingListIndex()); |
5776 | } else { |
5777 | NewAttr = ::new (getASTContext()) |
5778 | DLLImportStaticLocalAttr(ClassAttr->getRange(), |
5779 | getASTContext(), |
5780 | ClassAttr->getSpellingListIndex()); |
5781 | } |
5782 | } else { |
5783 | NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext())); |
5784 | } |
5785 | |
5786 | NewAttr->setInherited(true); |
5787 | Member->addAttr(NewAttr); |
5788 | |
5789 | if (MD) { |
5790 | // Propagate DLLAttr to friend re-declarations of MD that have already |
5791 | // been constructed. |
5792 | for (FunctionDecl *FD = MD->getMostRecentDecl(); FD; |
5793 | FD = FD->getPreviousDecl()) { |
5794 | if (FD->getFriendObjectKind() == Decl::FOK_None) |
5795 | continue; |
5796 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 5797, __PRETTY_FUNCTION__)) |
5797 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 5797, __PRETTY_FUNCTION__)); |
5798 | NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext())); |
5799 | NewAttr->setInherited(true); |
5800 | FD->addAttr(NewAttr); |
5801 | } |
5802 | } |
5803 | } |
5804 | } |
5805 | |
5806 | if (ClassExported) |
5807 | DelayedDllExportClasses.push_back(Class); |
5808 | } |
5809 | |
5810 | /// Perform propagation of DLL attributes from a derived class to a |
5811 | /// templated base class for MS compatibility. |
5812 | void Sema::propagateDLLAttrToBaseClassTemplate( |
5813 | CXXRecordDecl *Class, Attr *ClassAttr, |
5814 | ClassTemplateSpecializationDecl *BaseTemplateSpec, SourceLocation BaseLoc) { |
5815 | if (getDLLAttr( |
5816 | BaseTemplateSpec->getSpecializedTemplate()->getTemplatedDecl())) { |
5817 | // If the base class template has a DLL attribute, don't try to change it. |
5818 | return; |
5819 | } |
5820 | |
5821 | auto TSK = BaseTemplateSpec->getSpecializationKind(); |
5822 | if (!getDLLAttr(BaseTemplateSpec) && |
5823 | (TSK == TSK_Undeclared || TSK == TSK_ExplicitInstantiationDeclaration || |
5824 | TSK == TSK_ImplicitInstantiation)) { |
5825 | // The template hasn't been instantiated yet (or it has, but only as an |
5826 | // explicit instantiation declaration or implicit instantiation, which means |
5827 | // we haven't codegenned any members yet), so propagate the attribute. |
5828 | auto *NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext())); |
5829 | NewAttr->setInherited(true); |
5830 | BaseTemplateSpec->addAttr(NewAttr); |
5831 | |
5832 | // If this was an import, mark that we propagated it from a derived class to |
5833 | // a base class template specialization. |
5834 | if (auto *ImportAttr = dyn_cast<DLLImportAttr>(NewAttr)) |
5835 | ImportAttr->setPropagatedToBaseTemplate(); |
5836 | |
5837 | // If the template is already instantiated, checkDLLAttributeRedeclaration() |
5838 | // needs to be run again to work see the new attribute. Otherwise this will |
5839 | // get run whenever the template is instantiated. |
5840 | if (TSK != TSK_Undeclared) |
5841 | checkClassLevelDLLAttribute(BaseTemplateSpec); |
5842 | |
5843 | return; |
5844 | } |
5845 | |
5846 | if (getDLLAttr(BaseTemplateSpec)) { |
5847 | // The template has already been specialized or instantiated with an |
5848 | // attribute, explicitly or through propagation. We should not try to change |
5849 | // it. |
5850 | return; |
5851 | } |
5852 | |
5853 | // The template was previously instantiated or explicitly specialized without |
5854 | // a dll attribute, It's too late for us to add an attribute, so warn that |
5855 | // this is unsupported. |
5856 | Diag(BaseLoc, diag::warn_attribute_dll_instantiated_base_class) |
5857 | << BaseTemplateSpec->isExplicitSpecialization(); |
5858 | Diag(ClassAttr->getLocation(), diag::note_attribute); |
5859 | if (BaseTemplateSpec->isExplicitSpecialization()) { |
5860 | Diag(BaseTemplateSpec->getLocation(), |
5861 | diag::note_template_class_explicit_specialization_was_here) |
5862 | << BaseTemplateSpec; |
5863 | } else { |
5864 | Diag(BaseTemplateSpec->getPointOfInstantiation(), |
5865 | diag::note_template_class_instantiation_was_here) |
5866 | << BaseTemplateSpec; |
5867 | } |
5868 | } |
5869 | |
5870 | static void DefineImplicitSpecialMember(Sema &S, CXXMethodDecl *MD, |
5871 | SourceLocation DefaultLoc) { |
5872 | switch (S.getSpecialMember(MD)) { |
5873 | case Sema::CXXDefaultConstructor: |
5874 | S.DefineImplicitDefaultConstructor(DefaultLoc, |
5875 | cast<CXXConstructorDecl>(MD)); |
5876 | break; |
5877 | case Sema::CXXCopyConstructor: |
5878 | S.DefineImplicitCopyConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD)); |
5879 | break; |
5880 | case Sema::CXXCopyAssignment: |
5881 | S.DefineImplicitCopyAssignment(DefaultLoc, MD); |
5882 | break; |
5883 | case Sema::CXXDestructor: |
5884 | S.DefineImplicitDestructor(DefaultLoc, cast<CXXDestructorDecl>(MD)); |
5885 | break; |
5886 | case Sema::CXXMoveConstructor: |
5887 | S.DefineImplicitMoveConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD)); |
5888 | break; |
5889 | case Sema::CXXMoveAssignment: |
5890 | S.DefineImplicitMoveAssignment(DefaultLoc, MD); |
5891 | break; |
5892 | case Sema::CXXInvalid: |
5893 | llvm_unreachable("Invalid special member.")::llvm::llvm_unreachable_internal("Invalid special member.", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 5893); |
5894 | } |
5895 | } |
5896 | |
5897 | /// Determine whether a type is permitted to be passed or returned in |
5898 | /// registers, per C++ [class.temporary]p3. |
5899 | static bool canPassInRegisters(Sema &S, CXXRecordDecl *D, |
5900 | TargetInfo::CallingConvKind CCK) { |
5901 | if (D->isDependentType() || D->isInvalidDecl()) |
5902 | return false; |
5903 | |
5904 | // Clang <= 4 used the pre-C++11 rule, which ignores move operations. |
5905 | // The PS4 platform ABI follows the behavior of Clang 3.2. |
5906 | if (CCK == TargetInfo::CCK_ClangABI4OrPS4) |
5907 | return !D->hasNonTrivialDestructorForCall() && |
5908 | !D->hasNonTrivialCopyConstructorForCall(); |
5909 | |
5910 | if (CCK == TargetInfo::CCK_MicrosoftWin64) { |
5911 | bool CopyCtorIsTrivial = false, CopyCtorIsTrivialForCall = false; |
5912 | bool DtorIsTrivialForCall = false; |
5913 | |
5914 | // If a class has at least one non-deleted, trivial copy constructor, it |
5915 | // is passed according to the C ABI. Otherwise, it is passed indirectly. |
5916 | // |
5917 | // Note: This permits classes with non-trivial copy or move ctors to be |
5918 | // passed in registers, so long as they *also* have a trivial copy ctor, |
5919 | // which is non-conforming. |
5920 | if (D->needsImplicitCopyConstructor()) { |
5921 | if (!D->defaultedCopyConstructorIsDeleted()) { |
5922 | if (D->hasTrivialCopyConstructor()) |
5923 | CopyCtorIsTrivial = true; |
5924 | if (D->hasTrivialCopyConstructorForCall()) |
5925 | CopyCtorIsTrivialForCall = true; |
5926 | } |
5927 | } else { |
5928 | for (const CXXConstructorDecl *CD : D->ctors()) { |
5929 | if (CD->isCopyConstructor() && !CD->isDeleted()) { |
5930 | if (CD->isTrivial()) |
5931 | CopyCtorIsTrivial = true; |
5932 | if (CD->isTrivialForCall()) |
5933 | CopyCtorIsTrivialForCall = true; |
5934 | } |
5935 | } |
5936 | } |
5937 | |
5938 | if (D->needsImplicitDestructor()) { |
5939 | if (!D->defaultedDestructorIsDeleted() && |
5940 | D->hasTrivialDestructorForCall()) |
5941 | DtorIsTrivialForCall = true; |
5942 | } else if (const auto *DD = D->getDestructor()) { |
5943 | if (!DD->isDeleted() && DD->isTrivialForCall()) |
5944 | DtorIsTrivialForCall = true; |
5945 | } |
5946 | |
5947 | // If the copy ctor and dtor are both trivial-for-calls, pass direct. |
5948 | if (CopyCtorIsTrivialForCall && DtorIsTrivialForCall) |
5949 | return true; |
5950 | |
5951 | // If a class has a destructor, we'd really like to pass it indirectly |
5952 | // because it allows us to elide copies. Unfortunately, MSVC makes that |
5953 | // impossible for small types, which it will pass in a single register or |
5954 | // stack slot. Most objects with dtors are large-ish, so handle that early. |
5955 | // We can't call out all large objects as being indirect because there are |
5956 | // multiple x64 calling conventions and the C++ ABI code shouldn't dictate |
5957 | // how we pass large POD types. |
5958 | |
5959 | // Note: This permits small classes with nontrivial destructors to be |
5960 | // passed in registers, which is non-conforming. |
5961 | bool isAArch64 = S.Context.getTargetInfo().getTriple().isAArch64(); |
5962 | uint64_t TypeSize = isAArch64 ? 128 : 64; |
5963 | |
5964 | if (CopyCtorIsTrivial && |
5965 | S.getASTContext().getTypeSize(D->getTypeForDecl()) <= TypeSize) |
5966 | return true; |
5967 | return false; |
5968 | } |
5969 | |
5970 | // Per C++ [class.temporary]p3, the relevant condition is: |
5971 | // each copy constructor, move constructor, and destructor of X is |
5972 | // either trivial or deleted, and X has at least one non-deleted copy |
5973 | // or move constructor |
5974 | bool HasNonDeletedCopyOrMove = false; |
5975 | |
5976 | if (D->needsImplicitCopyConstructor() && |
5977 | !D->defaultedCopyConstructorIsDeleted()) { |
5978 | if (!D->hasTrivialCopyConstructorForCall()) |
5979 | return false; |
5980 | HasNonDeletedCopyOrMove = true; |
5981 | } |
5982 | |
5983 | if (S.getLangOpts().CPlusPlus11 && D->needsImplicitMoveConstructor() && |
5984 | !D->defaultedMoveConstructorIsDeleted()) { |
5985 | if (!D->hasTrivialMoveConstructorForCall()) |
5986 | return false; |
5987 | HasNonDeletedCopyOrMove = true; |
5988 | } |
5989 | |
5990 | if (D->needsImplicitDestructor() && !D->defaultedDestructorIsDeleted() && |
5991 | !D->hasTrivialDestructorForCall()) |
5992 | return false; |
5993 | |
5994 | for (const CXXMethodDecl *MD : D->methods()) { |
5995 | if (MD->isDeleted()) |
5996 | continue; |
5997 | |
5998 | auto *CD = dyn_cast<CXXConstructorDecl>(MD); |
5999 | if (CD && CD->isCopyOrMoveConstructor()) |
6000 | HasNonDeletedCopyOrMove = true; |
6001 | else if (!isa<CXXDestructorDecl>(MD)) |
6002 | continue; |
6003 | |
6004 | if (!MD->isTrivialForCall()) |
6005 | return false; |
6006 | } |
6007 | |
6008 | return HasNonDeletedCopyOrMove; |
6009 | } |
6010 | |
6011 | /// Perform semantic checks on a class definition that has been |
6012 | /// completing, introducing implicitly-declared members, checking for |
6013 | /// abstract types, etc. |
6014 | void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { |
6015 | if (!Record) |
6016 | return; |
6017 | |
6018 | if (Record->isAbstract() && !Record->isInvalidDecl()) { |
6019 | AbstractUsageInfo Info(*this, Record); |
6020 | CheckAbstractClassUsage(Info, Record); |
6021 | } |
6022 | |
6023 | // If this is not an aggregate type and has no user-declared constructor, |
6024 | // complain about any non-static data members of reference or const scalar |
6025 | // type, since they will never get initializers. |
6026 | if (!Record->isInvalidDecl() && !Record->isDependentType() && |
6027 | !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && |
6028 | !Record->isLambda()) { |
6029 | bool Complained = false; |
6030 | for (const auto *F : Record->fields()) { |
6031 | if (F->hasInClassInitializer() || F->isUnnamedBitfield()) |
6032 | continue; |
6033 | |
6034 | if (F->getType()->isReferenceType() || |
6035 | (F->getType().isConstQualified() && F->getType()->isScalarType())) { |
6036 | if (!Complained) { |
6037 | Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) |
6038 | << Record->getTagKind() << Record; |
6039 | Complained = true; |
6040 | } |
6041 | |
6042 | Diag(F->getLocation(), diag::note_refconst_member_not_initialized) |
6043 | << F->getType()->isReferenceType() |
6044 | << F->getDeclName(); |
6045 | } |
6046 | } |
6047 | } |
6048 | |
6049 | if (Record->getIdentifier()) { |
6050 | // C++ [class.mem]p13: |
6051 | // If T is the name of a class, then each of the following shall have a |
6052 | // name different from T: |
6053 | // - every member of every anonymous union that is a member of class T. |
6054 | // |
6055 | // C++ [class.mem]p14: |
6056 | // In addition, if class T has a user-declared constructor (12.1), every |
6057 | // non-static data member of class T shall have a name different from T. |
6058 | DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); |
6059 | for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; |
6060 | ++I) { |
6061 | NamedDecl *D = (*I)->getUnderlyingDecl(); |
6062 | if (((isa<FieldDecl>(D) || isa<UnresolvedUsingValueDecl>(D)) && |
6063 | Record->hasUserDeclaredConstructor()) || |
6064 | isa<IndirectFieldDecl>(D)) { |
6065 | Diag((*I)->getLocation(), diag::err_member_name_of_class) |
6066 | << D->getDeclName(); |
6067 | break; |
6068 | } |
6069 | } |
6070 | } |
6071 | |
6072 | // Warn if the class has virtual methods but non-virtual public destructor. |
6073 | if (Record->isPolymorphic() && !Record->isDependentType()) { |
6074 | CXXDestructorDecl *dtor = Record->getDestructor(); |
6075 | if ((!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) && |
6076 | !Record->hasAttr<FinalAttr>()) |
6077 | Diag(dtor ? dtor->getLocation() : Record->getLocation(), |
6078 | diag::warn_non_virtual_dtor) << Context.getRecordType(Record); |
6079 | } |
6080 | |
6081 | if (Record->isAbstract()) { |
6082 | if (FinalAttr *FA = Record->getAttr<FinalAttr>()) { |
6083 | Diag(Record->getLocation(), diag::warn_abstract_final_class) |
6084 | << FA->isSpelledAsSealed(); |
6085 | DiagnoseAbstractType(Record); |
6086 | } |
6087 | } |
6088 | |
6089 | // See if trivial_abi has to be dropped. |
6090 | if (Record->hasAttr<TrivialABIAttr>()) |
6091 | checkIllFormedTrivialABIStruct(*Record); |
6092 | |
6093 | // Set HasTrivialSpecialMemberForCall if the record has attribute |
6094 | // "trivial_abi". |
6095 | bool HasTrivialABI = Record->hasAttr<TrivialABIAttr>(); |
6096 | |
6097 | if (HasTrivialABI) |
6098 | Record->setHasTrivialSpecialMemberForCall(); |
6099 | |
6100 | bool HasMethodWithOverrideControl = false, |
6101 | HasOverridingMethodWithoutOverrideControl = false; |
6102 | if (!Record->isDependentType()) { |
6103 | for (auto *M : Record->methods()) { |
6104 | // See if a method overloads virtual methods in a base |
6105 | // class without overriding any. |
6106 | if (!M->isStatic()) |
6107 | DiagnoseHiddenVirtualMethods(M); |
6108 | if (M->hasAttr<OverrideAttr>()) |
6109 | HasMethodWithOverrideControl = true; |
6110 | else if (M->size_overridden_methods() > 0) |
6111 | HasOverridingMethodWithoutOverrideControl = true; |
6112 | // Check whether the explicitly-defaulted special members are valid. |
6113 | if (!M->isInvalidDecl() && M->isExplicitlyDefaulted()) |
6114 | CheckExplicitlyDefaultedSpecialMember(M); |
6115 | |
6116 | // For an explicitly defaulted or deleted special member, we defer |
6117 | // determining triviality until the class is complete. That time is now! |
6118 | CXXSpecialMember CSM = getSpecialMember(M); |
6119 | if (!M->isImplicit() && !M->isUserProvided()) { |
6120 | if (CSM != CXXInvalid) { |
6121 | M->setTrivial(SpecialMemberIsTrivial(M, CSM)); |
6122 | // Inform the class that we've finished declaring this member. |
6123 | Record->finishedDefaultedOrDeletedMember(M); |
6124 | M->setTrivialForCall( |
6125 | HasTrivialABI || |
6126 | SpecialMemberIsTrivial(M, CSM, TAH_ConsiderTrivialABI)); |
6127 | Record->setTrivialForCallFlags(M); |
6128 | } |
6129 | } |
6130 | |
6131 | // Set triviality for the purpose of calls if this is a user-provided |
6132 | // copy/move constructor or destructor. |
6133 | if ((CSM == CXXCopyConstructor || CSM == CXXMoveConstructor || |
6134 | CSM == CXXDestructor) && M->isUserProvided()) { |
6135 | M->setTrivialForCall(HasTrivialABI); |
6136 | Record->setTrivialForCallFlags(M); |
6137 | } |
6138 | |
6139 | if (!M->isInvalidDecl() && M->isExplicitlyDefaulted() && |
6140 | M->hasAttr<DLLExportAttr>()) { |
6141 | if (getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015) && |
6142 | M->isTrivial() && |
6143 | (CSM == CXXDefaultConstructor || CSM == CXXCopyConstructor || |
6144 | CSM == CXXDestructor)) |
6145 | M->dropAttr<DLLExportAttr>(); |
6146 | |
6147 | if (M->hasAttr<DLLExportAttr>()) { |
6148 | DefineImplicitSpecialMember(*this, M, M->getLocation()); |
6149 | ActOnFinishInlineFunctionDef(M); |
6150 | } |
6151 | } |
6152 | } |
6153 | } |
6154 | |
6155 | if (HasMethodWithOverrideControl && |
6156 | HasOverridingMethodWithoutOverrideControl) { |
6157 | // At least one method has the 'override' control declared. |
6158 | // Diagnose all other overridden methods which do not have 'override' specified on them. |
6159 | for (auto *M : Record->methods()) |
6160 | DiagnoseAbsenceOfOverrideControl(M); |
6161 | } |
6162 | |
6163 | // ms_struct is a request to use the same ABI rules as MSVC. Check |
6164 | // whether this class uses any C++ features that are implemented |
6165 | // completely differently in MSVC, and if so, emit a diagnostic. |
6166 | // That diagnostic defaults to an error, but we allow projects to |
6167 | // map it down to a warning (or ignore it). It's a fairly common |
6168 | // practice among users of the ms_struct pragma to mass-annotate |
6169 | // headers, sweeping up a bunch of types that the project doesn't |
6170 | // really rely on MSVC-compatible layout for. We must therefore |
6171 | // support "ms_struct except for C++ stuff" as a secondary ABI. |
6172 | if (Record->isMsStruct(Context) && |
6173 | (Record->isPolymorphic() || Record->getNumBases())) { |
6174 | Diag(Record->getLocation(), diag::warn_cxx_ms_struct); |
6175 | } |
6176 | |
6177 | checkClassLevelDLLAttribute(Record); |
6178 | checkClassLevelCodeSegAttribute(Record); |
6179 | |
6180 | bool ClangABICompat4 = |
6181 | Context.getLangOpts().getClangABICompat() <= LangOptions::ClangABI::Ver4; |
6182 | TargetInfo::CallingConvKind CCK = |
6183 | Context.getTargetInfo().getCallingConvKind(ClangABICompat4); |
6184 | bool CanPass = canPassInRegisters(*this, Record, CCK); |
6185 | |
6186 | // Do not change ArgPassingRestrictions if it has already been set to |
6187 | // APK_CanNeverPassInRegs. |
6188 | if (Record->getArgPassingRestrictions() != RecordDecl::APK_CanNeverPassInRegs) |
6189 | Record->setArgPassingRestrictions(CanPass |
6190 | ? RecordDecl::APK_CanPassInRegs |
6191 | : RecordDecl::APK_CannotPassInRegs); |
6192 | |
6193 | // If canPassInRegisters returns true despite the record having a non-trivial |
6194 | // destructor, the record is destructed in the callee. This happens only when |
6195 | // the record or one of its subobjects has a field annotated with trivial_abi |
6196 | // or a field qualified with ObjC __strong/__weak. |
6197 | if (Context.getTargetInfo().getCXXABI().areArgsDestroyedLeftToRightInCallee()) |
6198 | Record->setParamDestroyedInCallee(true); |
6199 | else if (Record->hasNonTrivialDestructor()) |
6200 | Record->setParamDestroyedInCallee(CanPass); |
6201 | |
6202 | if (getLangOpts().ForceEmitVTables) { |
6203 | // If we want to emit all the vtables, we need to mark it as used. This |
6204 | // is especially required for cases like vtable assumption loads. |
6205 | MarkVTableUsed(Record->getInnerLocStart(), Record); |
6206 | } |
6207 | } |
6208 | |
6209 | /// Look up the special member function that would be called by a special |
6210 | /// member function for a subobject of class type. |
6211 | /// |
6212 | /// \param Class The class type of the subobject. |
6213 | /// \param CSM The kind of special member function. |
6214 | /// \param FieldQuals If the subobject is a field, its cv-qualifiers. |
6215 | /// \param ConstRHS True if this is a copy operation with a const object |
6216 | /// on its RHS, that is, if the argument to the outer special member |
6217 | /// function is 'const' and this is not a field marked 'mutable'. |
6218 | static Sema::SpecialMemberOverloadResult lookupCallFromSpecialMember( |
6219 | Sema &S, CXXRecordDecl *Class, Sema::CXXSpecialMember CSM, |
6220 | unsigned FieldQuals, bool ConstRHS) { |
6221 | unsigned LHSQuals = 0; |
6222 | if (CSM == Sema::CXXCopyAssignment || CSM == Sema::CXXMoveAssignment) |
6223 | LHSQuals = FieldQuals; |
6224 | |
6225 | unsigned RHSQuals = FieldQuals; |
6226 | if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) |
6227 | RHSQuals = 0; |
6228 | else if (ConstRHS) |
6229 | RHSQuals |= Qualifiers::Const; |
6230 | |
6231 | return S.LookupSpecialMember(Class, CSM, |
6232 | RHSQuals & Qualifiers::Const, |
6233 | RHSQuals & Qualifiers::Volatile, |
6234 | false, |
6235 | LHSQuals & Qualifiers::Const, |
6236 | LHSQuals & Qualifiers::Volatile); |
6237 | } |
6238 | |
6239 | class Sema::InheritedConstructorInfo { |
6240 | Sema &S; |
6241 | SourceLocation UseLoc; |
6242 | |
6243 | /// A mapping from the base classes through which the constructor was |
6244 | /// inherited to the using shadow declaration in that base class (or a null |
6245 | /// pointer if the constructor was declared in that base class). |
6246 | llvm::DenseMap<CXXRecordDecl *, ConstructorUsingShadowDecl *> |
6247 | InheritedFromBases; |
6248 | |
6249 | public: |
6250 | InheritedConstructorInfo(Sema &S, SourceLocation UseLoc, |
6251 | ConstructorUsingShadowDecl *Shadow) |
6252 | : S(S), UseLoc(UseLoc) { |
6253 | bool DiagnosedMultipleConstructedBases = false; |
6254 | CXXRecordDecl *ConstructedBase = nullptr; |
6255 | UsingDecl *ConstructedBaseUsing = nullptr; |
6256 | |
6257 | // Find the set of such base class subobjects and check that there's a |
6258 | // unique constructed subobject. |
6259 | for (auto *D : Shadow->redecls()) { |
6260 | auto *DShadow = cast<ConstructorUsingShadowDecl>(D); |
6261 | auto *DNominatedBase = DShadow->getNominatedBaseClass(); |
6262 | auto *DConstructedBase = DShadow->getConstructedBaseClass(); |
6263 | |
6264 | InheritedFromBases.insert( |
6265 | std::make_pair(DNominatedBase->getCanonicalDecl(), |
6266 | DShadow->getNominatedBaseClassShadowDecl())); |
6267 | if (DShadow->constructsVirtualBase()) |
6268 | InheritedFromBases.insert( |
6269 | std::make_pair(DConstructedBase->getCanonicalDecl(), |
6270 | DShadow->getConstructedBaseClassShadowDecl())); |
6271 | else |
6272 | assert(DNominatedBase == DConstructedBase)((DNominatedBase == DConstructedBase) ? static_cast<void> (0) : __assert_fail ("DNominatedBase == DConstructedBase", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 6272, __PRETTY_FUNCTION__)); |
6273 | |
6274 | // [class.inhctor.init]p2: |
6275 | // If the constructor was inherited from multiple base class subobjects |
6276 | // of type B, the program is ill-formed. |
6277 | if (!ConstructedBase) { |
6278 | ConstructedBase = DConstructedBase; |
6279 | ConstructedBaseUsing = D->getUsingDecl(); |
6280 | } else if (ConstructedBase != DConstructedBase && |
6281 | !Shadow->isInvalidDecl()) { |
6282 | if (!DiagnosedMultipleConstructedBases) { |
6283 | S.Diag(UseLoc, diag::err_ambiguous_inherited_constructor) |
6284 | << Shadow->getTargetDecl(); |
6285 | S.Diag(ConstructedBaseUsing->getLocation(), |
6286 | diag::note_ambiguous_inherited_constructor_using) |
6287 | << ConstructedBase; |
6288 | DiagnosedMultipleConstructedBases = true; |
6289 | } |
6290 | S.Diag(D->getUsingDecl()->getLocation(), |
6291 | diag::note_ambiguous_inherited_constructor_using) |
6292 | << DConstructedBase; |
6293 | } |
6294 | } |
6295 | |
6296 | if (DiagnosedMultipleConstructedBases) |
6297 | Shadow->setInvalidDecl(); |
6298 | } |
6299 | |
6300 | /// Find the constructor to use for inherited construction of a base class, |
6301 | /// and whether that base class constructor inherits the constructor from a |
6302 | /// virtual base class (in which case it won't actually invoke it). |
6303 | std::pair<CXXConstructorDecl *, bool> |
6304 | findConstructorForBase(CXXRecordDecl *Base, CXXConstructorDecl *Ctor) const { |
6305 | auto It = InheritedFromBases.find(Base->getCanonicalDecl()); |
6306 | if (It == InheritedFromBases.end()) |
6307 | return std::make_pair(nullptr, false); |
6308 | |
6309 | // This is an intermediary class. |
6310 | if (It->second) |
6311 | return std::make_pair( |
6312 | S.findInheritingConstructor(UseLoc, Ctor, It->second), |
6313 | It->second->constructsVirtualBase()); |
6314 | |
6315 | // This is the base class from which the constructor was inherited. |
6316 | return std::make_pair(Ctor, false); |
6317 | } |
6318 | }; |
6319 | |
6320 | /// Is the special member function which would be selected to perform the |
6321 | /// specified operation on the specified class type a constexpr constructor? |
6322 | static bool |
6323 | specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, |
6324 | Sema::CXXSpecialMember CSM, unsigned Quals, |
6325 | bool ConstRHS, |
6326 | CXXConstructorDecl *InheritedCtor = nullptr, |
6327 | Sema::InheritedConstructorInfo *Inherited = nullptr) { |
6328 | // If we're inheriting a constructor, see if we need to call it for this base |
6329 | // class. |
6330 | if (InheritedCtor) { |
6331 | assert(CSM == Sema::CXXDefaultConstructor)((CSM == Sema::CXXDefaultConstructor) ? static_cast<void> (0) : __assert_fail ("CSM == Sema::CXXDefaultConstructor", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 6331, __PRETTY_FUNCTION__)); |
6332 | auto BaseCtor = |
6333 | Inherited->findConstructorForBase(ClassDecl, InheritedCtor).first; |
6334 | if (BaseCtor) |
6335 | return BaseCtor->isConstexpr(); |
6336 | } |
6337 | |
6338 | if (CSM == Sema::CXXDefaultConstructor) |
6339 | return ClassDecl->hasConstexprDefaultConstructor(); |
6340 | |
6341 | Sema::SpecialMemberOverloadResult SMOR = |
6342 | lookupCallFromSpecialMember(S, ClassDecl, CSM, Quals, ConstRHS); |
6343 | if (!SMOR.getMethod()) |
6344 | // A constructor we wouldn't select can't be "involved in initializing" |
6345 | // anything. |
6346 | return true; |
6347 | return SMOR.getMethod()->isConstexpr(); |
6348 | } |
6349 | |
6350 | /// Determine whether the specified special member function would be constexpr |
6351 | /// if it were implicitly defined. |
6352 | static bool defaultedSpecialMemberIsConstexpr( |
6353 | Sema &S, CXXRecordDecl *ClassDecl, Sema::CXXSpecialMember CSM, |
6354 | bool ConstArg, CXXConstructorDecl *InheritedCtor = nullptr, |
6355 | Sema::InheritedConstructorInfo *Inherited = nullptr) { |
6356 | if (!S.getLangOpts().CPlusPlus11) |
6357 | return false; |
6358 | |
6359 | // C++11 [dcl.constexpr]p4: |
6360 | // In the definition of a constexpr constructor [...] |
6361 | bool Ctor = true; |
6362 | switch (CSM) { |
6363 | case Sema::CXXDefaultConstructor: |
6364 | if (Inherited) |
6365 | break; |
6366 | // Since default constructor lookup is essentially trivial (and cannot |
6367 | // involve, for instance, template instantiation), we compute whether a |
6368 | // defaulted default constructor is constexpr directly within CXXRecordDecl. |
6369 | // |
6370 | // This is important for performance; we need to know whether the default |
6371 | // constructor is constexpr to determine whether the type is a literal type. |
6372 | return ClassDecl->defaultedDefaultConstructorIsConstexpr(); |
6373 | |
6374 | case Sema::CXXCopyConstructor: |
6375 | case Sema::CXXMoveConstructor: |
6376 | // For copy or move constructors, we need to perform overload resolution. |
6377 | break; |
6378 | |
6379 | case Sema::CXXCopyAssignment: |
6380 | case Sema::CXXMoveAssignment: |
6381 | if (!S.getLangOpts().CPlusPlus14) |
6382 | return false; |
6383 | // In C++1y, we need to perform overload resolution. |
6384 | Ctor = false; |
6385 | break; |
6386 | |
6387 | case Sema::CXXDestructor: |
6388 | case Sema::CXXInvalid: |
6389 | return false; |
6390 | } |
6391 | |
6392 | // -- if the class is a non-empty union, or for each non-empty anonymous |
6393 | // union member of a non-union class, exactly one non-static data member |
6394 | // shall be initialized; [DR1359] |
6395 | // |
6396 | // If we squint, this is guaranteed, since exactly one non-static data member |
6397 | // will be initialized (if the constructor isn't deleted), we just don't know |
6398 | // which one. |
6399 | if (Ctor && ClassDecl->isUnion()) |
6400 | return CSM == Sema::CXXDefaultConstructor |
6401 | ? ClassDecl->hasInClassInitializer() || |
6402 | !ClassDecl->hasVariantMembers() |
6403 | : true; |
6404 | |
6405 | // -- the class shall not have any virtual base classes; |
6406 | if (Ctor && ClassDecl->getNumVBases()) |
6407 | return false; |
6408 | |
6409 | // C++1y [class.copy]p26: |
6410 | // -- [the class] is a literal type, and |
6411 | if (!Ctor && !ClassDecl->isLiteral()) |
6412 | return false; |
6413 | |
6414 | // -- every constructor involved in initializing [...] base class |
6415 | // sub-objects shall be a constexpr constructor; |
6416 | // -- the assignment operator selected to copy/move each direct base |
6417 | // class is a constexpr function, and |
6418 | for (const auto &B : ClassDecl->bases()) { |
6419 | const RecordType *BaseType = B.getType()->getAs<RecordType>(); |
6420 | if (!BaseType) continue; |
6421 | |
6422 | CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); |
6423 | if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, 0, ConstArg, |
6424 | InheritedCtor, Inherited)) |
6425 | return false; |
6426 | } |
6427 | |
6428 | // -- every constructor involved in initializing non-static data members |
6429 | // [...] shall be a constexpr constructor; |
6430 | // -- every non-static data member and base class sub-object shall be |
6431 | // initialized |
6432 | // -- for each non-static data member of X that is of class type (or array |
6433 | // thereof), the assignment operator selected to copy/move that member is |
6434 | // a constexpr function |
6435 | for (const auto *F : ClassDecl->fields()) { |
6436 | if (F->isInvalidDecl()) |
6437 | continue; |
6438 | if (CSM == Sema::CXXDefaultConstructor && F->hasInClassInitializer()) |
6439 | continue; |
6440 | QualType BaseType = S.Context.getBaseElementType(F->getType()); |
6441 | if (const RecordType *RecordTy = BaseType->getAs<RecordType>()) { |
6442 | CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); |
6443 | if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, |
6444 | BaseType.getCVRQualifiers(), |
6445 | ConstArg && !F->isMutable())) |
6446 | return false; |
6447 | } else if (CSM == Sema::CXXDefaultConstructor) { |
6448 | return false; |
6449 | } |
6450 | } |
6451 | |
6452 | // All OK, it's constexpr! |
6453 | return true; |
6454 | } |
6455 | |
6456 | static Sema::ImplicitExceptionSpecification |
6457 | ComputeDefaultedSpecialMemberExceptionSpec( |
6458 | Sema &S, SourceLocation Loc, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM, |
6459 | Sema::InheritedConstructorInfo *ICI); |
6460 | |
6461 | static Sema::ImplicitExceptionSpecification |
6462 | computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { |
6463 | auto CSM = S.getSpecialMember(MD); |
6464 | if (CSM != Sema::CXXInvalid) |
6465 | return ComputeDefaultedSpecialMemberExceptionSpec(S, Loc, MD, CSM, nullptr); |
6466 | |
6467 | auto *CD = cast<CXXConstructorDecl>(MD); |
6468 | assert(CD->getInheritedConstructor() &&((CD->getInheritedConstructor() && "only special members have implicit exception specs" ) ? static_cast<void> (0) : __assert_fail ("CD->getInheritedConstructor() && \"only special members have implicit exception specs\"" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 6469, __PRETTY_FUNCTION__)) |
6469 | "only special members have implicit exception specs")((CD->getInheritedConstructor() && "only special members have implicit exception specs" ) ? static_cast<void> (0) : __assert_fail ("CD->getInheritedConstructor() && \"only special members have implicit exception specs\"" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 6469, __PRETTY_FUNCTION__)); |
6470 | Sema::InheritedConstructorInfo ICI( |
6471 | S, Loc, CD->getInheritedConstructor().getShadowDecl()); |
6472 | return ComputeDefaultedSpecialMemberExceptionSpec( |
6473 | S, Loc, CD, Sema::CXXDefaultConstructor, &ICI); |
6474 | } |
6475 | |
6476 | static FunctionProtoType::ExtProtoInfo getImplicitMethodEPI(Sema &S, |
6477 | CXXMethodDecl *MD) { |
6478 | FunctionProtoType::ExtProtoInfo EPI; |
6479 | |
6480 | // Build an exception specification pointing back at this member. |
6481 | EPI.ExceptionSpec.Type = EST_Unevaluated; |
6482 | EPI.ExceptionSpec.SourceDecl = MD; |
6483 | |
6484 | // Set the calling convention to the default for C++ instance methods. |
6485 | EPI.ExtInfo = EPI.ExtInfo.withCallingConv( |
6486 | S.Context.getDefaultCallingConvention(/*IsVariadic=*/false, |
6487 | /*IsCXXMethod=*/true)); |
6488 | return EPI; |
6489 | } |
6490 | |
6491 | void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { |
6492 | const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); |
6493 | if (FPT->getExceptionSpecType() != EST_Unevaluated) |
6494 | return; |
6495 | |
6496 | // Evaluate the exception specification. |
6497 | auto IES = computeImplicitExceptionSpec(*this, Loc, MD); |
6498 | auto ESI = IES.getExceptionSpec(); |
6499 | |
6500 | // Update the type of the special member to use it. |
6501 | UpdateExceptionSpec(MD, ESI); |
6502 | |
6503 | // A user-provided destructor can be defined outside the class. When that |
6504 | // happens, be sure to update the exception specification on both |
6505 | // declarations. |
6506 | const FunctionProtoType *CanonicalFPT = |
6507 | MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); |
6508 | if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) |
6509 | UpdateExceptionSpec(MD->getCanonicalDecl(), ESI); |
6510 | } |
6511 | |
6512 | void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { |
6513 | CXXRecordDecl *RD = MD->getParent(); |
6514 | CXXSpecialMember CSM = getSpecialMember(MD); |
6515 | |
6516 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 6517, __PRETTY_FUNCTION__)) |
6517 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 6517, __PRETTY_FUNCTION__)); |
6518 | |
6519 | // Whether this was the first-declared instance of the constructor. |
6520 | // This affects whether we implicitly add an exception spec and constexpr. |
6521 | bool First = MD == MD->getCanonicalDecl(); |
6522 | |
6523 | bool HadError = false; |
6524 | |
6525 | // C++11 [dcl.fct.def.default]p1: |
6526 | // A function that is explicitly defaulted shall |
6527 | // -- be a special member function (checked elsewhere), |
6528 | // -- have the same type (except for ref-qualifiers, and except that a |
6529 | // copy operation can take a non-const reference) as an implicit |
6530 | // declaration, and |
6531 | // -- not have default arguments. |
6532 | // C++2a changes the second bullet to instead delete the function if it's |
6533 | // defaulted on its first declaration, unless it's "an assignment operator, |
6534 | // and its return type differs or its parameter type is not a reference". |
6535 | bool DeleteOnTypeMismatch = getLangOpts().CPlusPlus2a && First; |
6536 | bool ShouldDeleteForTypeMismatch = false; |
6537 | unsigned ExpectedParams = 1; |
6538 | if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) |
6539 | ExpectedParams = 0; |
6540 | if (MD->getNumParams() != ExpectedParams) { |
6541 | // This checks for default arguments: a copy or move constructor with a |
6542 | // default argument is classified as a default constructor, and assignment |
6543 | // operations and destructors can't have default arguments. |
6544 | Diag(MD->getLocation(), diag::err_defaulted_special_member_params) |
6545 | << CSM << MD->getSourceRange(); |
6546 | HadError = true; |
6547 | } else if (MD->isVariadic()) { |
6548 | if (DeleteOnTypeMismatch) |
6549 | ShouldDeleteForTypeMismatch = true; |
6550 | else { |
6551 | Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic) |
6552 | << CSM << MD->getSourceRange(); |
6553 | HadError = true; |
6554 | } |
6555 | } |
6556 | |
6557 | const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); |
6558 | |
6559 | bool CanHaveConstParam = false; |
6560 | if (CSM == CXXCopyConstructor) |
6561 | CanHaveConstParam = RD->implicitCopyConstructorHasConstParam(); |
6562 | else if (CSM == CXXCopyAssignment) |
6563 | CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam(); |
6564 | |
6565 | QualType ReturnType = Context.VoidTy; |
6566 | if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { |
6567 | // Check for return type matching. |
6568 | ReturnType = Type->getReturnType(); |
6569 | |
6570 | QualType DeclType = Context.getTypeDeclType(RD); |
6571 | DeclType = Context.getAddrSpaceQualType(DeclType, MD->getMethodQualifiers().getAddressSpace()); |
6572 | QualType ExpectedReturnType = Context.getLValueReferenceType(DeclType); |
6573 | |
6574 | if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { |
6575 | Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) |
6576 | << (CSM == CXXMoveAssignment) << ExpectedReturnType; |
6577 | HadError = true; |
6578 | } |
6579 | |
6580 | // A defaulted special member cannot have cv-qualifiers. |
6581 | if (Type->getMethodQuals().hasConst() || Type->getMethodQuals().hasVolatile()) { |
6582 | if (DeleteOnTypeMismatch) |
6583 | ShouldDeleteForTypeMismatch = true; |
6584 | else { |
6585 | Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) |
6586 | << (CSM == CXXMoveAssignment) << getLangOpts().CPlusPlus14; |
6587 | HadError = true; |
6588 | } |
6589 | } |
6590 | } |
6591 | |
6592 | // Check for parameter type matching. |
6593 | QualType ArgType = ExpectedParams ? Type->getParamType(0) : QualType(); |
6594 | bool HasConstParam = false; |
6595 | if (ExpectedParams && ArgType->isReferenceType()) { |
6596 | // Argument must be reference to possibly-const T. |
6597 | QualType ReferentType = ArgType->getPointeeType(); |
6598 | HasConstParam = ReferentType.isConstQualified(); |
6599 | |
6600 | if (ReferentType.isVolatileQualified()) { |
6601 | if (DeleteOnTypeMismatch) |
6602 | ShouldDeleteForTypeMismatch = true; |
6603 | else { |
6604 | Diag(MD->getLocation(), |
6605 | diag::err_defaulted_special_member_volatile_param) << CSM; |
6606 | HadError = true; |
6607 | } |
6608 | } |
6609 | |
6610 | if (HasConstParam && !CanHaveConstParam) { |
6611 | if (DeleteOnTypeMismatch) |
6612 | ShouldDeleteForTypeMismatch = true; |
6613 | else if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { |
6614 | Diag(MD->getLocation(), |
6615 | diag::err_defaulted_special_member_copy_const_param) |
6616 | << (CSM == CXXCopyAssignment); |
6617 | // FIXME: Explain why this special member can't be const. |
6618 | HadError = true; |
6619 | } else { |
6620 | Diag(MD->getLocation(), |
6621 | diag::err_defaulted_special_member_move_const_param) |
6622 | << (CSM == CXXMoveAssignment); |
6623 | HadError = true; |
6624 | } |
6625 | } |
6626 | } else if (ExpectedParams) { |
6627 | // A copy assignment operator can take its argument by value, but a |
6628 | // defaulted one cannot. |
6629 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 6629, __PRETTY_FUNCTION__)); |
6630 | Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); |
6631 | HadError = true; |
6632 | } |
6633 | |
6634 | // C++11 [dcl.fct.def.default]p2: |
6635 | // An explicitly-defaulted function may be declared constexpr only if it |
6636 | // would have been implicitly declared as constexpr, |
6637 | // Do not apply this rule to members of class templates, since core issue 1358 |
6638 | // makes such functions always instantiate to constexpr functions. For |
6639 | // functions which cannot be constexpr (for non-constructors in C++11 and for |
6640 | // destructors in C++1y), this is checked elsewhere. |
6641 | // |
6642 | // FIXME: This should not apply if the member is deleted. |
6643 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, |
6644 | HasConstParam); |
6645 | if ((getLangOpts().CPlusPlus14 ? !isa<CXXDestructorDecl>(MD) |
6646 | : isa<CXXConstructorDecl>(MD)) && |
6647 | MD->isConstexpr() && !Constexpr && |
6648 | MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { |
6649 | Diag(MD->getBeginLoc(), diag::err_incorrect_defaulted_constexpr) << CSM; |
6650 | // FIXME: Explain why the special member can't be constexpr. |
6651 | HadError = true; |
6652 | } |
6653 | |
6654 | if (First) { |
6655 | // C++2a [dcl.fct.def.default]p3: |
6656 | // If a function is explicitly defaulted on its first declaration, it is |
6657 | // implicitly considered to be constexpr if the implicit declaration |
6658 | // would be. |
6659 | MD->setConstexpr(Constexpr); |
6660 | |
6661 | if (!Type->hasExceptionSpec()) { |
6662 | // C++2a [except.spec]p3: |
6663 | // If a declaration of a function does not have a noexcept-specifier |
6664 | // [and] is defaulted on its first declaration, [...] the exception |
6665 | // specification is as specified below |
6666 | FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); |
6667 | EPI.ExceptionSpec.Type = EST_Unevaluated; |
6668 | EPI.ExceptionSpec.SourceDecl = MD; |
6669 | MD->setType(Context.getFunctionType(ReturnType, |
6670 | llvm::makeArrayRef(&ArgType, |
6671 | ExpectedParams), |
6672 | EPI)); |
6673 | } |
6674 | } |
6675 | |
6676 | if (ShouldDeleteForTypeMismatch || ShouldDeleteSpecialMember(MD, CSM)) { |
6677 | if (First) { |
6678 | SetDeclDeleted(MD, MD->getLocation()); |
6679 | if (!inTemplateInstantiation() && !HadError) { |
6680 | Diag(MD->getLocation(), diag::warn_defaulted_method_deleted) << CSM; |
6681 | if (ShouldDeleteForTypeMismatch) { |
6682 | Diag(MD->getLocation(), diag::note_deleted_type_mismatch) << CSM; |
6683 | } else { |
6684 | ShouldDeleteSpecialMember(MD, CSM, nullptr, /*Diagnose*/true); |
6685 | } |
6686 | } |
6687 | if (ShouldDeleteForTypeMismatch && !HadError) { |
6688 | Diag(MD->getLocation(), |
6689 | diag::warn_cxx17_compat_defaulted_method_type_mismatch) << CSM; |
6690 | } |
6691 | } else { |
6692 | // C++11 [dcl.fct.def.default]p4: |
6693 | // [For a] user-provided explicitly-defaulted function [...] if such a |
6694 | // function is implicitly defined as deleted, the program is ill-formed. |
6695 | Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; |
6696 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 6696, __PRETTY_FUNCTION__)); |
6697 | ShouldDeleteSpecialMember(MD, CSM, nullptr, /*Diagnose*/true); |
6698 | HadError = true; |
6699 | } |
6700 | } |
6701 | |
6702 | if (HadError) |
6703 | MD->setInvalidDecl(); |
6704 | } |
6705 | |
6706 | void Sema::CheckDelayedMemberExceptionSpecs() { |
6707 | decltype(DelayedOverridingExceptionSpecChecks) Overriding; |
6708 | decltype(DelayedEquivalentExceptionSpecChecks) Equivalent; |
6709 | |
6710 | std::swap(Overriding, DelayedOverridingExceptionSpecChecks); |
6711 | std::swap(Equivalent, DelayedEquivalentExceptionSpecChecks); |
6712 | |
6713 | // Perform any deferred checking of exception specifications for virtual |
6714 | // destructors. |
6715 | for (auto &Check : Overriding) |
6716 | CheckOverridingFunctionExceptionSpec(Check.first, Check.second); |
6717 | |
6718 | // Perform any deferred checking of exception specifications for befriended |
6719 | // special members. |
6720 | for (auto &Check : Equivalent) |
6721 | CheckEquivalentExceptionSpec(Check.second, Check.first); |
6722 | } |
6723 | |
6724 | namespace { |
6725 | /// CRTP base class for visiting operations performed by a special member |
6726 | /// function (or inherited constructor). |
6727 | template<typename Derived> |
6728 | struct SpecialMemberVisitor { |
6729 | Sema &S; |
6730 | CXXMethodDecl *MD; |
6731 | Sema::CXXSpecialMember CSM; |
6732 | Sema::InheritedConstructorInfo *ICI; |
6733 | |
6734 | // Properties of the special member, computed for convenience. |
6735 | bool IsConstructor = false, IsAssignment = false, ConstArg = false; |
6736 | |
6737 | SpecialMemberVisitor(Sema &S, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM, |
6738 | Sema::InheritedConstructorInfo *ICI) |
6739 | : S(S), MD(MD), CSM(CSM), ICI(ICI) { |
6740 | switch (CSM) { |
6741 | case Sema::CXXDefaultConstructor: |
6742 | case Sema::CXXCopyConstructor: |
6743 | case Sema::CXXMoveConstructor: |
6744 | IsConstructor = true; |
6745 | break; |
6746 | case Sema::CXXCopyAssignment: |
6747 | case Sema::CXXMoveAssignment: |
6748 | IsAssignment = true; |
6749 | break; |
6750 | case Sema::CXXDestructor: |
6751 | break; |
6752 | case Sema::CXXInvalid: |
6753 | llvm_unreachable("invalid special member kind")::llvm::llvm_unreachable_internal("invalid special member kind" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 6753); |
6754 | } |
6755 | |
6756 | if (MD->getNumParams()) { |
6757 | if (const ReferenceType *RT = |
6758 | MD->getParamDecl(0)->getType()->getAs<ReferenceType>()) |
6759 | ConstArg = RT->getPointeeType().isConstQualified(); |
6760 | } |
6761 | } |
6762 | |
6763 | Derived &getDerived() { return static_cast<Derived&>(*this); } |
6764 | |
6765 | /// Is this a "move" special member? |
6766 | bool isMove() const { |
6767 | return CSM == Sema::CXXMoveConstructor || CSM == Sema::CXXMoveAssignment; |
6768 | } |
6769 | |
6770 | /// Look up the corresponding special member in the given class. |
6771 | Sema::SpecialMemberOverloadResult lookupIn(CXXRecordDecl *Class, |
6772 | unsigned Quals, bool IsMutable) { |
6773 | return lookupCallFromSpecialMember(S, Class, CSM, Quals, |
6774 | ConstArg && !IsMutable); |
6775 | } |
6776 | |
6777 | /// Look up the constructor for the specified base class to see if it's |
6778 | /// overridden due to this being an inherited constructor. |
6779 | Sema::SpecialMemberOverloadResult lookupInheritedCtor(CXXRecordDecl *Class) { |
6780 | if (!ICI) |
6781 | return {}; |
6782 | assert(CSM == Sema::CXXDefaultConstructor)((CSM == Sema::CXXDefaultConstructor) ? static_cast<void> (0) : __assert_fail ("CSM == Sema::CXXDefaultConstructor", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 6782, __PRETTY_FUNCTION__)); |
6783 | auto *BaseCtor = |
6784 | cast<CXXConstructorDecl>(MD)->getInheritedConstructor().getConstructor(); |
6785 | if (auto *MD = ICI->findConstructorForBase(Class, BaseCtor).first) |
6786 | return MD; |
6787 | return {}; |
6788 | } |
6789 | |
6790 | /// A base or member subobject. |
6791 | typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; |
6792 | |
6793 | /// Get the location to use for a subobject in diagnostics. |
6794 | static SourceLocation getSubobjectLoc(Subobject Subobj) { |
6795 | // FIXME: For an indirect virtual base, the direct base leading to |
6796 | // the indirect virtual base would be a more useful choice. |
6797 | if (auto *B = Subobj.dyn_cast<CXXBaseSpecifier*>()) |
6798 | return B->getBaseTypeLoc(); |
6799 | else |
6800 | return Subobj.get<FieldDecl*>()->getLocation(); |
6801 | } |
6802 | |
6803 | enum BasesToVisit { |
6804 | /// Visit all non-virtual (direct) bases. |
6805 | VisitNonVirtualBases, |
6806 | /// Visit all direct bases, virtual or not. |
6807 | VisitDirectBases, |
6808 | /// Visit all non-virtual bases, and all virtual bases if the class |
6809 | /// is not abstract. |
6810 | VisitPotentiallyConstructedBases, |
6811 | /// Visit all direct or virtual bases. |
6812 | VisitAllBases |
6813 | }; |
6814 | |
6815 | // Visit the bases and members of the class. |
6816 | bool visit(BasesToVisit Bases) { |
6817 | CXXRecordDecl *RD = MD->getParent(); |
6818 | |
6819 | if (Bases == VisitPotentiallyConstructedBases) |
6820 | Bases = RD->isAbstract() ? VisitNonVirtualBases : VisitAllBases; |
6821 | |
6822 | for (auto &B : RD->bases()) |
6823 | if ((Bases == VisitDirectBases || !B.isVirtual()) && |
6824 | getDerived().visitBase(&B)) |
6825 | return true; |
6826 | |
6827 | if (Bases == VisitAllBases) |
6828 | for (auto &B : RD->vbases()) |
6829 | if (getDerived().visitBase(&B)) |
6830 | return true; |
6831 | |
6832 | for (auto *F : RD->fields()) |
6833 | if (!F->isInvalidDecl() && !F->isUnnamedBitfield() && |
6834 | getDerived().visitField(F)) |
6835 | return true; |
6836 | |
6837 | return false; |
6838 | } |
6839 | }; |
6840 | } |
6841 | |
6842 | namespace { |
6843 | struct SpecialMemberDeletionInfo |
6844 | : SpecialMemberVisitor<SpecialMemberDeletionInfo> { |
6845 | bool Diagnose; |
6846 | |
6847 | SourceLocation Loc; |
6848 | |
6849 | bool AllFieldsAreConst; |
6850 | |
6851 | SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, |
6852 | Sema::CXXSpecialMember CSM, |
6853 | Sema::InheritedConstructorInfo *ICI, bool Diagnose) |
6854 | : SpecialMemberVisitor(S, MD, CSM, ICI), Diagnose(Diagnose), |
6855 | Loc(MD->getLocation()), AllFieldsAreConst(true) {} |
6856 | |
6857 | bool inUnion() const { return MD->getParent()->isUnion(); } |
6858 | |
6859 | Sema::CXXSpecialMember getEffectiveCSM() { |
6860 | return ICI ? Sema::CXXInvalid : CSM; |
6861 | } |
6862 | |
6863 | bool shouldDeleteForVariantObjCPtrMember(FieldDecl *FD, QualType FieldType); |
6864 | |
6865 | bool visitBase(CXXBaseSpecifier *Base) { return shouldDeleteForBase(Base); } |
6866 | bool visitField(FieldDecl *Field) { return shouldDeleteForField(Field); } |
6867 | |
6868 | bool shouldDeleteForBase(CXXBaseSpecifier *Base); |
6869 | bool shouldDeleteForField(FieldDecl *FD); |
6870 | bool shouldDeleteForAllConstMembers(); |
6871 | |
6872 | bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, |
6873 | unsigned Quals); |
6874 | bool shouldDeleteForSubobjectCall(Subobject Subobj, |
6875 | Sema::SpecialMemberOverloadResult SMOR, |
6876 | bool IsDtorCallInCtor); |
6877 | |
6878 | bool isAccessible(Subobject Subobj, CXXMethodDecl *D); |
6879 | }; |
6880 | } |
6881 | |
6882 | /// Is the given special member inaccessible when used on the given |
6883 | /// sub-object. |
6884 | bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, |
6885 | CXXMethodDecl *target) { |
6886 | /// If we're operating on a base class, the object type is the |
6887 | /// type of this special member. |
6888 | QualType objectTy; |
6889 | AccessSpecifier access = target->getAccess(); |
6890 | if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { |
6891 | objectTy = S.Context.getTypeDeclType(MD->getParent()); |
6892 | access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); |
6893 | |
6894 | // If we're operating on a field, the object type is the type of the field. |
6895 | } else { |
6896 | objectTy = S.Context.getTypeDeclType(target->getParent()); |
6897 | } |
6898 | |
6899 | return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); |
6900 | } |
6901 | |
6902 | /// Check whether we should delete a special member due to the implicit |
6903 | /// definition containing a call to a special member of a subobject. |
6904 | bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( |
6905 | Subobject Subobj, Sema::SpecialMemberOverloadResult SMOR, |
6906 | bool IsDtorCallInCtor) { |
6907 | CXXMethodDecl *Decl = SMOR.getMethod(); |
6908 | FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); |
6909 | |
6910 | int DiagKind = -1; |
6911 | |
6912 | if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) |
6913 | DiagKind = !Decl ? 0 : 1; |
6914 | else if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) |
6915 | DiagKind = 2; |
6916 | else if (!isAccessible(Subobj, Decl)) |
6917 | DiagKind = 3; |
6918 | else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && |
6919 | !Decl->isTrivial()) { |
6920 | // A member of a union must have a trivial corresponding special member. |
6921 | // As a weird special case, a destructor call from a union's constructor |
6922 | // must be accessible and non-deleted, but need not be trivial. Such a |
6923 | // destructor is never actually called, but is semantically checked as |
6924 | // if it were. |
6925 | DiagKind = 4; |
6926 | } |
6927 | |
6928 | if (DiagKind == -1) |
6929 | return false; |
6930 | |
6931 | if (Diagnose) { |
6932 | if (Field) { |
6933 | S.Diag(Field->getLocation(), |
6934 | diag::note_deleted_special_member_class_subobject) |
6935 | << getEffectiveCSM() << MD->getParent() << /*IsField*/true |
6936 | << Field << DiagKind << IsDtorCallInCtor << /*IsObjCPtr*/false; |
6937 | } else { |
6938 | CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); |
6939 | S.Diag(Base->getBeginLoc(), |
6940 | diag::note_deleted_special_member_class_subobject) |
6941 | << getEffectiveCSM() << MD->getParent() << /*IsField*/ false |
6942 | << Base->getType() << DiagKind << IsDtorCallInCtor |
6943 | << /*IsObjCPtr*/false; |
6944 | } |
6945 | |
6946 | if (DiagKind == 1) |
6947 | S.NoteDeletedFunction(Decl); |
6948 | // FIXME: Explain inaccessibility if DiagKind == 3. |
6949 | } |
6950 | |
6951 | return true; |
6952 | } |
6953 | |
6954 | /// Check whether we should delete a special member function due to having a |
6955 | /// direct or virtual base class or non-static data member of class type M. |
6956 | bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( |
6957 | CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { |
6958 | FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); |
6959 | bool IsMutable = Field && Field->isMutable(); |
6960 | |
6961 | // C++11 [class.ctor]p5: |
6962 | // -- any direct or virtual base class, or non-static data member with no |
6963 | // brace-or-equal-initializer, has class type M (or array thereof) and |
6964 | // either M has no default constructor or overload resolution as applied |
6965 | // to M's default constructor results in an ambiguity or in a function |
6966 | // that is deleted or inaccessible |
6967 | // C++11 [class.copy]p11, C++11 [class.copy]p23: |
6968 | // -- a direct or virtual base class B that cannot be copied/moved because |
6969 | // overload resolution, as applied to B's corresponding special member, |
6970 | // results in an ambiguity or a function that is deleted or inaccessible |
6971 | // from the defaulted special member |
6972 | // C++11 [class.dtor]p5: |
6973 | // -- any direct or virtual base class [...] has a type with a destructor |
6974 | // that is deleted or inaccessible |
6975 | if (!(CSM == Sema::CXXDefaultConstructor && |
6976 | Field && Field->hasInClassInitializer()) && |
6977 | shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals, IsMutable), |
6978 | false)) |
6979 | return true; |
6980 | |
6981 | // C++11 [class.ctor]p5, C++11 [class.copy]p11: |
6982 | // -- any direct or virtual base class or non-static data member has a |
6983 | // type with a destructor that is deleted or inaccessible |
6984 | if (IsConstructor) { |
6985 | Sema::SpecialMemberOverloadResult SMOR = |
6986 | S.LookupSpecialMember(Class, Sema::CXXDestructor, |
6987 | false, false, false, false, false); |
6988 | if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) |
6989 | return true; |
6990 | } |
6991 | |
6992 | return false; |
6993 | } |
6994 | |
6995 | bool SpecialMemberDeletionInfo::shouldDeleteForVariantObjCPtrMember( |
6996 | FieldDecl *FD, QualType FieldType) { |
6997 | // The defaulted special functions are defined as deleted if this is a variant |
6998 | // member with a non-trivial ownership type, e.g., ObjC __strong or __weak |
6999 | // type under ARC. |
7000 | if (!FieldType.hasNonTrivialObjCLifetime()) |
7001 | return false; |
7002 | |
7003 | // Don't make the defaulted default constructor defined as deleted if the |
7004 | // member has an in-class initializer. |
7005 | if (CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer()) |
7006 | return false; |
7007 | |
7008 | if (Diagnose) { |
7009 | auto *ParentClass = cast<CXXRecordDecl>(FD->getParent()); |
7010 | S.Diag(FD->getLocation(), |
7011 | diag::note_deleted_special_member_class_subobject) |
7012 | << getEffectiveCSM() << ParentClass << /*IsField*/true |
7013 | << FD << 4 << /*IsDtorCallInCtor*/false << /*IsObjCPtr*/true; |
7014 | } |
7015 | |
7016 | return true; |
7017 | } |
7018 | |
7019 | /// Check whether we should delete a special member function due to the class |
7020 | /// having a particular direct or virtual base class. |
7021 | bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { |
7022 | CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); |
7023 | // If program is correct, BaseClass cannot be null, but if it is, the error |
7024 | // must be reported elsewhere. |
7025 | if (!BaseClass) |
7026 | return false; |
7027 | // If we have an inheriting constructor, check whether we're calling an |
7028 | // inherited constructor instead of a default constructor. |
7029 | Sema::SpecialMemberOverloadResult SMOR = lookupInheritedCtor(BaseClass); |
7030 | if (auto *BaseCtor = SMOR.getMethod()) { |
7031 | // Note that we do not check access along this path; other than that, |
7032 | // this is the same as shouldDeleteForSubobjectCall(Base, BaseCtor, false); |
7033 | // FIXME: Check that the base has a usable destructor! Sink this into |
7034 | // shouldDeleteForClassSubobject. |
7035 | if (BaseCtor->isDeleted() && Diagnose) { |
7036 | S.Diag(Base->getBeginLoc(), |
7037 | diag::note_deleted_special_member_class_subobject) |
7038 | << getEffectiveCSM() << MD->getParent() << /*IsField*/ false |
7039 | << Base->getType() << /*Deleted*/ 1 << /*IsDtorCallInCtor*/ false |
7040 | << /*IsObjCPtr*/false; |
7041 | S.NoteDeletedFunction(BaseCtor); |
7042 | } |
7043 | return BaseCtor->isDeleted(); |
7044 | } |
7045 | return shouldDeleteForClassSubobject(BaseClass, Base, 0); |
7046 | } |
7047 | |
7048 | /// Check whether we should delete a special member function due to the class |
7049 | /// having a particular non-static data member. |
7050 | bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { |
7051 | QualType FieldType = S.Context.getBaseElementType(FD->getType()); |
7052 | CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); |
7053 | |
7054 | if (inUnion() && shouldDeleteForVariantObjCPtrMember(FD, FieldType)) |
7055 | return true; |
7056 | |
7057 | if (CSM == Sema::CXXDefaultConstructor) { |
7058 | // For a default constructor, all references must be initialized in-class |
7059 | // and, if a union, it must have a non-const member. |
7060 | if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { |
7061 | if (Diagnose) |
7062 | S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) |
7063 | << !!ICI << MD->getParent() << FD << FieldType << /*Reference*/0; |
7064 | return true; |
7065 | } |
7066 | // C++11 [class.ctor]p5: any non-variant non-static data member of |
7067 | // const-qualified type (or array thereof) with no |
7068 | // brace-or-equal-initializer does not have a user-provided default |
7069 | // constructor. |
7070 | if (!inUnion() && FieldType.isConstQualified() && |
7071 | !FD->hasInClassInitializer() && |
7072 | (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { |
7073 | if (Diagnose) |
7074 | S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) |
7075 | << !!ICI << MD->getParent() << FD << FD->getType() << /*Const*/1; |
7076 | return true; |
7077 | } |
7078 | |
7079 | if (inUnion() && !FieldType.isConstQualified()) |
7080 | AllFieldsAreConst = false; |
7081 | } else if (CSM == Sema::CXXCopyConstructor) { |
7082 | // For a copy constructor, data members must not be of rvalue reference |
7083 | // type. |
7084 | if (FieldType->isRValueReferenceType()) { |
7085 | if (Diagnose) |
7086 | S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) |
7087 | << MD->getParent() << FD << FieldType; |
7088 | return true; |
7089 | } |
7090 | } else if (IsAssignment) { |
7091 | // For an assignment operator, data members must not be of reference type. |
7092 | if (FieldType->isReferenceType()) { |
7093 | if (Diagnose) |
7094 | S.Diag(FD->getLocation(), diag::note_deleted_assign_field) |
7095 | << isMove() << MD->getParent() << FD << FieldType << /*Reference*/0; |
7096 | return true; |
7097 | } |
7098 | if (!FieldRecord && FieldType.isConstQualified()) { |
7099 | // C++11 [class.copy]p23: |
7100 | // -- a non-static data member of const non-class type (or array thereof) |
7101 | if (Diagnose) |
7102 | S.Diag(FD->getLocation(), diag::note_deleted_assign_field) |
7103 | << isMove() << MD->getParent() << FD << FD->getType() << /*Const*/1; |
7104 | return true; |
7105 | } |
7106 | } |
7107 | |
7108 | if (FieldRecord) { |
7109 | // Some additional restrictions exist on the variant members. |
7110 | if (!inUnion() && FieldRecord->isUnion() && |
7111 | FieldRecord->isAnonymousStructOrUnion()) { |
7112 | bool AllVariantFieldsAreConst = true; |
7113 | |
7114 | // FIXME: Handle anonymous unions declared within anonymous unions. |
7115 | for (auto *UI : FieldRecord->fields()) { |
7116 | QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); |
7117 | |
7118 | if (shouldDeleteForVariantObjCPtrMember(&*UI, UnionFieldType)) |
7119 | return true; |
7120 | |
7121 | if (!UnionFieldType.isConstQualified()) |
7122 | AllVariantFieldsAreConst = false; |
7123 | |
7124 | CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); |
7125 | if (UnionFieldRecord && |
7126 | shouldDeleteForClassSubobject(UnionFieldRecord, UI, |
7127 | UnionFieldType.getCVRQualifiers())) |
7128 | return true; |
7129 | } |
7130 | |
7131 | // At least one member in each anonymous union must be non-const |
7132 | if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && |
7133 | !FieldRecord->field_empty()) { |
7134 | if (Diagnose) |
7135 | S.Diag(FieldRecord->getLocation(), |
7136 | diag::note_deleted_default_ctor_all_const) |
7137 | << !!ICI << MD->getParent() << /*anonymous union*/1; |
7138 | return true; |
7139 | } |
7140 | |
7141 | // Don't check the implicit member of the anonymous union type. |
7142 | // This is technically non-conformant, but sanity demands it. |
7143 | return false; |
7144 | } |
7145 | |
7146 | if (shouldDeleteForClassSubobject(FieldRecord, FD, |
7147 | FieldType.getCVRQualifiers())) |
7148 | return true; |
7149 | } |
7150 | |
7151 | return false; |
7152 | } |
7153 | |
7154 | /// C++11 [class.ctor] p5: |
7155 | /// A defaulted default constructor for a class X is defined as deleted if |
7156 | /// X is a union and all of its variant members are of const-qualified type. |
7157 | bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { |
7158 | // This is a silly definition, because it gives an empty union a deleted |
7159 | // default constructor. Don't do that. |
7160 | if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst) { |
7161 | bool AnyFields = false; |
7162 | for (auto *F : MD->getParent()->fields()) |
7163 | if ((AnyFields = !F->isUnnamedBitfield())) |
7164 | break; |
7165 | if (!AnyFields) |
7166 | return false; |
7167 | if (Diagnose) |
7168 | S.Diag(MD->getParent()->getLocation(), |
7169 | diag::note_deleted_default_ctor_all_const) |
7170 | << !!ICI << MD->getParent() << /*not anonymous union*/0; |
7171 | return true; |
7172 | } |
7173 | return false; |
7174 | } |
7175 | |
7176 | /// Determine whether a defaulted special member function should be defined as |
7177 | /// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, |
7178 | /// C++11 [class.copy]p23, and C++11 [class.dtor]p5. |
7179 | bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, |
7180 | InheritedConstructorInfo *ICI, |
7181 | bool Diagnose) { |
7182 | if (MD->isInvalidDecl()) |
7183 | return false; |
7184 | CXXRecordDecl *RD = MD->getParent(); |
7185 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 7185, __PRETTY_FUNCTION__)); |
7186 | if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl()) |
7187 | return false; |
7188 | |
7189 | // C++11 [expr.lambda.prim]p19: |
7190 | // The closure type associated with a lambda-expression has a |
7191 | // deleted (8.4.3) default constructor and a deleted copy |
7192 | // assignment operator. |
7193 | // C++2a adds back these operators if the lambda has no capture-default. |
7194 | if (RD->isLambda() && !RD->lambdaIsDefaultConstructibleAndAssignable() && |
7195 | (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { |
7196 | if (Diagnose) |
7197 | Diag(RD->getLocation(), diag::note_lambda_decl); |
7198 | return true; |
7199 | } |
7200 | |
7201 | // For an anonymous struct or union, the copy and assignment special members |
7202 | // will never be used, so skip the check. For an anonymous union declared at |
7203 | // namespace scope, the constructor and destructor are used. |
7204 | if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && |
7205 | RD->isAnonymousStructOrUnion()) |
7206 | return false; |
7207 | |
7208 | // C++11 [class.copy]p7, p18: |
7209 | // If the class definition declares a move constructor or move assignment |
7210 | // operator, an implicitly declared copy constructor or copy assignment |
7211 | // operator is defined as deleted. |
7212 | if (MD->isImplicit() && |
7213 | (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { |
7214 | CXXMethodDecl *UserDeclaredMove = nullptr; |
7215 | |
7216 | // In Microsoft mode up to MSVC 2013, a user-declared move only causes the |
7217 | // deletion of the corresponding copy operation, not both copy operations. |
7218 | // MSVC 2015 has adopted the standards conforming behavior. |
7219 | bool DeletesOnlyMatchingCopy = |
7220 | getLangOpts().MSVCCompat && |
7221 | !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015); |
7222 | |
7223 | if (RD->hasUserDeclaredMoveConstructor() && |
7224 | (!DeletesOnlyMatchingCopy || CSM == CXXCopyConstructor)) { |
7225 | if (!Diagnose) return true; |
7226 | |
7227 | // Find any user-declared move constructor. |
7228 | for (auto *I : RD->ctors()) { |
7229 | if (I->isMoveConstructor()) { |
7230 | UserDeclaredMove = I; |
7231 | break; |
7232 | } |
7233 | } |
7234 | assert(UserDeclaredMove)((UserDeclaredMove) ? static_cast<void> (0) : __assert_fail ("UserDeclaredMove", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 7234, __PRETTY_FUNCTION__)); |
7235 | } else if (RD->hasUserDeclaredMoveAssignment() && |
7236 | (!DeletesOnlyMatchingCopy || CSM == CXXCopyAssignment)) { |
7237 | if (!Diagnose) return true; |
7238 | |
7239 | // Find any user-declared move assignment operator. |
7240 | for (auto *I : RD->methods()) { |
7241 | if (I->isMoveAssignmentOperator()) { |
7242 | UserDeclaredMove = I; |
7243 | break; |
7244 | } |
7245 | } |
7246 | assert(UserDeclaredMove)((UserDeclaredMove) ? static_cast<void> (0) : __assert_fail ("UserDeclaredMove", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 7246, __PRETTY_FUNCTION__)); |
7247 | } |
7248 | |
7249 | if (UserDeclaredMove) { |
7250 | Diag(UserDeclaredMove->getLocation(), |
7251 | diag::note_deleted_copy_user_declared_move) |
7252 | << (CSM == CXXCopyAssignment) << RD |
7253 | << UserDeclaredMove->isMoveAssignmentOperator(); |
7254 | return true; |
7255 | } |
7256 | } |
7257 | |
7258 | // Do access control from the special member function |
7259 | ContextRAII MethodContext(*this, MD); |
7260 | |
7261 | // C++11 [class.dtor]p5: |
7262 | // -- for a virtual destructor, lookup of the non-array deallocation function |
7263 | // results in an ambiguity or in a function that is deleted or inaccessible |
7264 | if (CSM == CXXDestructor && MD->isVirtual()) { |
7265 | FunctionDecl *OperatorDelete = nullptr; |
7266 | DeclarationName Name = |
7267 | Context.DeclarationNames.getCXXOperatorName(OO_Delete); |
7268 | if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, |
7269 | OperatorDelete, /*Diagnose*/false)) { |
7270 | if (Diagnose) |
7271 | Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); |
7272 | return true; |
7273 | } |
7274 | } |
7275 | |
7276 | SpecialMemberDeletionInfo SMI(*this, MD, CSM, ICI, Diagnose); |
7277 | |
7278 | // Per DR1611, do not consider virtual bases of constructors of abstract |
7279 | // classes, since we are not going to construct them. |
7280 | // Per DR1658, do not consider virtual bases of destructors of abstract |
7281 | // classes either. |
7282 | // Per DR2180, for assignment operators we only assign (and thus only |
7283 | // consider) direct bases. |
7284 | if (SMI.visit(SMI.IsAssignment ? SMI.VisitDirectBases |
7285 | : SMI.VisitPotentiallyConstructedBases)) |
7286 | return true; |
7287 | |
7288 | if (SMI.shouldDeleteForAllConstMembers()) |
7289 | return true; |
7290 | |
7291 | if (getLangOpts().CUDA) { |
7292 | // We should delete the special member in CUDA mode if target inference |
7293 | // failed. |
7294 | // For inherited constructors (non-null ICI), CSM may be passed so that MD |
7295 | // is treated as certain special member, which may not reflect what special |
7296 | // member MD really is. However inferCUDATargetForImplicitSpecialMember |
7297 | // expects CSM to match MD, therefore recalculate CSM. |
7298 | assert(ICI || CSM == getSpecialMember(MD))((ICI || CSM == getSpecialMember(MD)) ? static_cast<void> (0) : __assert_fail ("ICI || CSM == getSpecialMember(MD)", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 7298, __PRETTY_FUNCTION__)); |
7299 | auto RealCSM = CSM; |
7300 | if (ICI) |
7301 | RealCSM = getSpecialMember(MD); |
7302 | |
7303 | return inferCUDATargetForImplicitSpecialMember(RD, RealCSM, MD, |
7304 | SMI.ConstArg, Diagnose); |
7305 | } |
7306 | |
7307 | return false; |
7308 | } |
7309 | |
7310 | /// Perform lookup for a special member of the specified kind, and determine |
7311 | /// whether it is trivial. If the triviality can be determined without the |
7312 | /// lookup, skip it. This is intended for use when determining whether a |
7313 | /// special member of a containing object is trivial, and thus does not ever |
7314 | /// perform overload resolution for default constructors. |
7315 | /// |
7316 | /// If \p Selected is not \c NULL, \c *Selected will be filled in with the |
7317 | /// member that was most likely to be intended to be trivial, if any. |
7318 | /// |
7319 | /// If \p ForCall is true, look at CXXRecord::HasTrivialSpecialMembersForCall to |
7320 | /// determine whether the special member is trivial. |
7321 | static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD, |
7322 | Sema::CXXSpecialMember CSM, unsigned Quals, |
7323 | bool ConstRHS, |
7324 | Sema::TrivialABIHandling TAH, |
7325 | CXXMethodDecl **Selected) { |
7326 | if (Selected) |
7327 | *Selected = nullptr; |
7328 | |
7329 | switch (CSM) { |
7330 | case Sema::CXXInvalid: |
7331 | llvm_unreachable("not a special member")::llvm::llvm_unreachable_internal("not a special member", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 7331); |
7332 | |
7333 | case Sema::CXXDefaultConstructor: |
7334 | // C++11 [class.ctor]p5: |
7335 | // A default constructor is trivial if: |
7336 | // - all the [direct subobjects] have trivial default constructors |
7337 | // |
7338 | // Note, no overload resolution is performed in this case. |
7339 | if (RD->hasTrivialDefaultConstructor()) |
7340 | return true; |
7341 | |
7342 | if (Selected) { |
7343 | // If there's a default constructor which could have been trivial, dig it |
7344 | // out. Otherwise, if there's any user-provided default constructor, point |
7345 | // to that as an example of why there's not a trivial one. |
7346 | CXXConstructorDecl *DefCtor = nullptr; |
7347 | if (RD->needsImplicitDefaultConstructor()) |
7348 | S.DeclareImplicitDefaultConstructor(RD); |
7349 | for (auto *CI : RD->ctors()) { |
7350 | if (!CI->isDefaultConstructor()) |
7351 | continue; |
7352 | DefCtor = CI; |
7353 | if (!DefCtor->isUserProvided()) |
7354 | break; |
7355 | } |
7356 | |
7357 | *Selected = DefCtor; |
7358 | } |
7359 | |
7360 | return false; |
7361 | |
7362 | case Sema::CXXDestructor: |
7363 | // C++11 [class.dtor]p5: |
7364 | // A destructor is trivial if: |
7365 | // - all the direct [subobjects] have trivial destructors |
7366 | if (RD->hasTrivialDestructor() || |
7367 | (TAH == Sema::TAH_ConsiderTrivialABI && |
7368 | RD->hasTrivialDestructorForCall())) |
7369 | return true; |
7370 | |
7371 | if (Selected) { |
7372 | if (RD->needsImplicitDestructor()) |
7373 | S.DeclareImplicitDestructor(RD); |
7374 | *Selected = RD->getDestructor(); |
7375 | } |
7376 | |
7377 | return false; |
7378 | |
7379 | case Sema::CXXCopyConstructor: |
7380 | // C++11 [class.copy]p12: |
7381 | // A copy constructor is trivial if: |
7382 | // - the constructor selected to copy each direct [subobject] is trivial |
7383 | if (RD->hasTrivialCopyConstructor() || |
7384 | (TAH == Sema::TAH_ConsiderTrivialABI && |
7385 | RD->hasTrivialCopyConstructorForCall())) { |
7386 | if (Quals == Qualifiers::Const) |
7387 | // We must either select the trivial copy constructor or reach an |
7388 | // ambiguity; no need to actually perform overload resolution. |
7389 | return true; |
7390 | } else if (!Selected) { |
7391 | return false; |
7392 | } |
7393 | // In C++98, we are not supposed to perform overload resolution here, but we |
7394 | // treat that as a language defect, as suggested on cxx-abi-dev, to treat |
7395 | // cases like B as having a non-trivial copy constructor: |
7396 | // struct A { template<typename T> A(T&); }; |
7397 | // struct B { mutable A a; }; |
7398 | goto NeedOverloadResolution; |
7399 | |
7400 | case Sema::CXXCopyAssignment: |
7401 | // C++11 [class.copy]p25: |
7402 | // A copy assignment operator is trivial if: |
7403 | // - the assignment operator selected to copy each direct [subobject] is |
7404 | // trivial |
7405 | if (RD->hasTrivialCopyAssignment()) { |
7406 | if (Quals == Qualifiers::Const) |
7407 | return true; |
7408 | } else if (!Selected) { |
7409 | return false; |
7410 | } |
7411 | // In C++98, we are not supposed to perform overload resolution here, but we |
7412 | // treat that as a language defect. |
7413 | goto NeedOverloadResolution; |
7414 | |
7415 | case Sema::CXXMoveConstructor: |
7416 | case Sema::CXXMoveAssignment: |
7417 | NeedOverloadResolution: |
7418 | Sema::SpecialMemberOverloadResult SMOR = |
7419 | lookupCallFromSpecialMember(S, RD, CSM, Quals, ConstRHS); |
7420 | |
7421 | // The standard doesn't describe how to behave if the lookup is ambiguous. |
7422 | // We treat it as not making the member non-trivial, just like the standard |
7423 | // mandates for the default constructor. This should rarely matter, because |
7424 | // the member will also be deleted. |
7425 | if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) |
7426 | return true; |
7427 | |
7428 | if (!SMOR.getMethod()) { |
7429 | assert(SMOR.getKind() ==((SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted ) ? static_cast<void> (0) : __assert_fail ("SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 7430, __PRETTY_FUNCTION__)) |
7430 | Sema::SpecialMemberOverloadResult::NoMemberOrDeleted)((SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted ) ? static_cast<void> (0) : __assert_fail ("SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 7430, __PRETTY_FUNCTION__)); |
7431 | return false; |
7432 | } |
7433 | |
7434 | // We deliberately don't check if we found a deleted special member. We're |
7435 | // not supposed to! |
7436 | if (Selected) |
7437 | *Selected = SMOR.getMethod(); |
7438 | |
7439 | if (TAH == Sema::TAH_ConsiderTrivialABI && |
7440 | (CSM == Sema::CXXCopyConstructor || CSM == Sema::CXXMoveConstructor)) |
7441 | return SMOR.getMethod()->isTrivialForCall(); |
7442 | return SMOR.getMethod()->isTrivial(); |
7443 | } |
7444 | |
7445 | llvm_unreachable("unknown special method kind")::llvm::llvm_unreachable_internal("unknown special method kind" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 7445); |
7446 | } |
7447 | |
7448 | static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) { |
7449 | for (auto *CI : RD->ctors()) |
7450 | if (!CI->isImplicit()) |
7451 | return CI; |
7452 | |
7453 | // Look for constructor templates. |
7454 | typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter; |
7455 | for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) { |
7456 | if (CXXConstructorDecl *CD = |
7457 | dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl())) |
7458 | return CD; |
7459 | } |
7460 | |
7461 | return nullptr; |
7462 | } |
7463 | |
7464 | /// The kind of subobject we are checking for triviality. The values of this |
7465 | /// enumeration are used in diagnostics. |
7466 | enum TrivialSubobjectKind { |
7467 | /// The subobject is a base class. |
7468 | TSK_BaseClass, |
7469 | /// The subobject is a non-static data member. |
7470 | TSK_Field, |
7471 | /// The object is actually the complete object. |
7472 | TSK_CompleteObject |
7473 | }; |
7474 | |
7475 | /// Check whether the special member selected for a given type would be trivial. |
7476 | static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc, |
7477 | QualType SubType, bool ConstRHS, |
7478 | Sema::CXXSpecialMember CSM, |
7479 | TrivialSubobjectKind Kind, |
7480 | Sema::TrivialABIHandling TAH, bool Diagnose) { |
7481 | CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl(); |
7482 | if (!SubRD) |
7483 | return true; |
7484 | |
7485 | CXXMethodDecl *Selected; |
7486 | if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(), |
7487 | ConstRHS, TAH, Diagnose ? &Selected : nullptr)) |
7488 | return true; |
7489 | |
7490 | if (Diagnose) { |
7491 | if (ConstRHS) |
7492 | SubType.addConst(); |
7493 | |
7494 | if (!Selected && CSM == Sema::CXXDefaultConstructor) { |
7495 | S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor) |
7496 | << Kind << SubType.getUnqualifiedType(); |
7497 | if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD)) |
7498 | S.Diag(CD->getLocation(), diag::note_user_declared_ctor); |
7499 | } else if (!Selected) |
7500 | S.Diag(SubobjLoc, diag::note_nontrivial_no_copy) |
7501 | << Kind << SubType.getUnqualifiedType() << CSM << SubType; |
7502 | else if (Selected->isUserProvided()) { |
7503 | if (Kind == TSK_CompleteObject) |
7504 | S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided) |
7505 | << Kind << SubType.getUnqualifiedType() << CSM; |
7506 | else { |
7507 | S.Diag(SubobjLoc, diag::note_nontrivial_user_provided) |
7508 | << Kind << SubType.getUnqualifiedType() << CSM; |
7509 | S.Diag(Selected->getLocation(), diag::note_declared_at); |
7510 | } |
7511 | } else { |
7512 | if (Kind != TSK_CompleteObject) |
7513 | S.Diag(SubobjLoc, diag::note_nontrivial_subobject) |
7514 | << Kind << SubType.getUnqualifiedType() << CSM; |
7515 | |
7516 | // Explain why the defaulted or deleted special member isn't trivial. |
7517 | S.SpecialMemberIsTrivial(Selected, CSM, Sema::TAH_IgnoreTrivialABI, |
7518 | Diagnose); |
7519 | } |
7520 | } |
7521 | |
7522 | return false; |
7523 | } |
7524 | |
7525 | /// Check whether the members of a class type allow a special member to be |
7526 | /// trivial. |
7527 | static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD, |
7528 | Sema::CXXSpecialMember CSM, |
7529 | bool ConstArg, |
7530 | Sema::TrivialABIHandling TAH, |
7531 | bool Diagnose) { |
7532 | for (const auto *FI : RD->fields()) { |
7533 | if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) |
7534 | continue; |
7535 | |
7536 | QualType FieldType = S.Context.getBaseElementType(FI->getType()); |
7537 | |
7538 | // Pretend anonymous struct or union members are members of this class. |
7539 | if (FI->isAnonymousStructOrUnion()) { |
7540 | if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(), |
7541 | CSM, ConstArg, TAH, Diagnose)) |
7542 | return false; |
7543 | continue; |
7544 | } |
7545 | |
7546 | // C++11 [class.ctor]p5: |
7547 | // A default constructor is trivial if [...] |
7548 | // -- no non-static data member of its class has a |
7549 | // brace-or-equal-initializer |
7550 | if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) { |
7551 | if (Diagnose) |
7552 | S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << FI; |
7553 | return false; |
7554 | } |
7555 | |
7556 | // Objective C ARC 4.3.5: |
7557 | // [...] nontrivally ownership-qualified types are [...] not trivially |
7558 | // default constructible, copy constructible, move constructible, copy |
7559 | // assignable, move assignable, or destructible [...] |
7560 | if (FieldType.hasNonTrivialObjCLifetime()) { |
7561 | if (Diagnose) |
7562 | S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership) |
7563 | << RD << FieldType.getObjCLifetime(); |
7564 | return false; |
7565 | } |
7566 | |
7567 | bool ConstRHS = ConstArg && !FI->isMutable(); |
7568 | if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, ConstRHS, |
7569 | CSM, TSK_Field, TAH, Diagnose)) |
7570 | return false; |
7571 | } |
7572 | |
7573 | return true; |
7574 | } |
7575 | |
7576 | /// Diagnose why the specified class does not have a trivial special member of |
7577 | /// the given kind. |
7578 | void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) { |
7579 | QualType Ty = Context.getRecordType(RD); |
7580 | |
7581 | bool ConstArg = (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment); |
7582 | checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, ConstArg, CSM, |
7583 | TSK_CompleteObject, TAH_IgnoreTrivialABI, |
7584 | /*Diagnose*/true); |
7585 | } |
7586 | |
7587 | /// Determine whether a defaulted or deleted special member function is trivial, |
7588 | /// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12, |
7589 | /// C++11 [class.copy]p25, and C++11 [class.dtor]p5. |
7590 | bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM, |
7591 | TrivialABIHandling TAH, bool Diagnose) { |
7592 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 7592, __PRETTY_FUNCTION__)); |
7593 | |
7594 | CXXRecordDecl *RD = MD->getParent(); |
7595 | |
7596 | bool ConstArg = false; |
7597 | |
7598 | // C++11 [class.copy]p12, p25: [DR1593] |
7599 | // A [special member] is trivial if [...] its parameter-type-list is |
7600 | // equivalent to the parameter-type-list of an implicit declaration [...] |
7601 | switch (CSM) { |
7602 | case CXXDefaultConstructor: |
7603 | case CXXDestructor: |
7604 | // Trivial default constructors and destructors cannot have parameters. |
7605 | break; |
7606 | |
7607 | case CXXCopyConstructor: |
7608 | case CXXCopyAssignment: { |
7609 | // Trivial copy operations always have const, non-volatile parameter types. |
7610 | ConstArg = true; |
7611 | const ParmVarDecl *Param0 = MD->getParamDecl(0); |
7612 | const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>(); |
7613 | if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) { |
7614 | if (Diagnose) |
7615 | Diag(Param0->getLocation(), diag::note_nontrivial_param_type) |
7616 | << Param0->getSourceRange() << Param0->getType() |
7617 | << Context.getLValueReferenceType( |
7618 | Context.getRecordType(RD).withConst()); |
7619 | return false; |
7620 | } |
7621 | break; |
7622 | } |
7623 | |
7624 | case CXXMoveConstructor: |
7625 | case CXXMoveAssignment: { |
7626 | // Trivial move operations always have non-cv-qualified parameters. |
7627 | const ParmVarDecl *Param0 = MD->getParamDecl(0); |
7628 | const RValueReferenceType *RT = |
7629 | Param0->getType()->getAs<RValueReferenceType>(); |
7630 | if (!RT || RT->getPointeeType().getCVRQualifiers()) { |
7631 | if (Diagnose) |
7632 | Diag(Param0->getLocation(), diag::note_nontrivial_param_type) |
7633 | << Param0->getSourceRange() << Param0->getType() |
7634 | << Context.getRValueReferenceType(Context.getRecordType(RD)); |
7635 | return false; |
7636 | } |
7637 | break; |
7638 | } |
7639 | |
7640 | case CXXInvalid: |
7641 | llvm_unreachable("not a special member")::llvm::llvm_unreachable_internal("not a special member", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 7641); |
7642 | } |
7643 | |
7644 | if (MD->getMinRequiredArguments() < MD->getNumParams()) { |
7645 | if (Diagnose) |
7646 | Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(), |
7647 | diag::note_nontrivial_default_arg) |
7648 | << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange(); |
7649 | return false; |
7650 | } |
7651 | if (MD->isVariadic()) { |
7652 | if (Diagnose) |
7653 | Diag(MD->getLocation(), diag::note_nontrivial_variadic); |
7654 | return false; |
7655 | } |
7656 | |
7657 | // C++11 [class.ctor]p5, C++11 [class.dtor]p5: |
7658 | // A copy/move [constructor or assignment operator] is trivial if |
7659 | // -- the [member] selected to copy/move each direct base class subobject |
7660 | // is trivial |
7661 | // |
7662 | // C++11 [class.copy]p12, C++11 [class.copy]p25: |
7663 | // A [default constructor or destructor] is trivial if |
7664 | // -- all the direct base classes have trivial [default constructors or |
7665 | // destructors] |
7666 | for (const auto &BI : RD->bases()) |
7667 | if (!checkTrivialSubobjectCall(*this, BI.getBeginLoc(), BI.getType(), |
7668 | ConstArg, CSM, TSK_BaseClass, TAH, Diagnose)) |
7669 | return false; |
7670 | |
7671 | // C++11 [class.ctor]p5, C++11 [class.dtor]p5: |
7672 | // A copy/move [constructor or assignment operator] for a class X is |
7673 | // trivial if |
7674 | // -- for each non-static data member of X that is of class type (or array |
7675 | // thereof), the constructor selected to copy/move that member is |
7676 | // trivial |
7677 | // |
7678 | // C++11 [class.copy]p12, C++11 [class.copy]p25: |
7679 | // A [default constructor or destructor] is trivial if |
7680 | // -- for all of the non-static data members of its class that are of class |
7681 | // type (or array thereof), each such class has a trivial [default |
7682 | // constructor or destructor] |
7683 | if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, TAH, Diagnose)) |
7684 | return false; |
7685 | |
7686 | // C++11 [class.dtor]p5: |
7687 | // A destructor is trivial if [...] |
7688 | // -- the destructor is not virtual |
7689 | if (CSM == CXXDestructor && MD->isVirtual()) { |
7690 | if (Diagnose) |
7691 | Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD; |
7692 | return false; |
7693 | } |
7694 | |
7695 | // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25: |
7696 | // A [special member] for class X is trivial if [...] |
7697 | // -- class X has no virtual functions and no virtual base classes |
7698 | if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) { |
7699 | if (!Diagnose) |
7700 | return false; |
7701 | |
7702 | if (RD->getNumVBases()) { |
7703 | // Check for virtual bases. We already know that the corresponding |
7704 | // member in all bases is trivial, so vbases must all be direct. |
7705 | CXXBaseSpecifier &BS = *RD->vbases_begin(); |
7706 | assert(BS.isVirtual())((BS.isVirtual()) ? static_cast<void> (0) : __assert_fail ("BS.isVirtual()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 7706, __PRETTY_FUNCTION__)); |
7707 | Diag(BS.getBeginLoc(), diag::note_nontrivial_has_virtual) << RD << 1; |
7708 | return false; |
7709 | } |
7710 | |
7711 | // Must have a virtual method. |
7712 | for (const auto *MI : RD->methods()) { |
7713 | if (MI->isVirtual()) { |
7714 | SourceLocation MLoc = MI->getBeginLoc(); |
7715 | Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0; |
7716 | return false; |
7717 | } |
7718 | } |
7719 | |
7720 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 7720); |
7721 | } |
7722 | |
7723 | // Looks like it's trivial! |
7724 | return true; |
7725 | } |
7726 | |
7727 | namespace { |
7728 | struct FindHiddenVirtualMethod { |
7729 | Sema *S; |
7730 | CXXMethodDecl *Method; |
7731 | llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; |
7732 | SmallVector<CXXMethodDecl *, 8> OverloadedMethods; |
7733 | |
7734 | private: |
7735 | /// Check whether any most overridden method from MD in Methods |
7736 | static bool CheckMostOverridenMethods( |
7737 | const CXXMethodDecl *MD, |
7738 | const llvm::SmallPtrSetImpl<const CXXMethodDecl *> &Methods) { |
7739 | if (MD->size_overridden_methods() == 0) |
7740 | return Methods.count(MD->getCanonicalDecl()); |
7741 | for (const CXXMethodDecl *O : MD->overridden_methods()) |
7742 | if (CheckMostOverridenMethods(O, Methods)) |
7743 | return true; |
7744 | return false; |
7745 | } |
7746 | |
7747 | public: |
7748 | /// Member lookup function that determines whether a given C++ |
7749 | /// method overloads virtual methods in a base class without overriding any, |
7750 | /// to be used with CXXRecordDecl::lookupInBases(). |
7751 | bool operator()(const CXXBaseSpecifier *Specifier, CXXBasePath &Path) { |
7752 | RecordDecl *BaseRecord = |
7753 | Specifier->getType()->getAs<RecordType>()->getDecl(); |
7754 | |
7755 | DeclarationName Name = Method->getDeclName(); |
7756 | assert(Name.getNameKind() == DeclarationName::Identifier)((Name.getNameKind() == DeclarationName::Identifier) ? static_cast <void> (0) : __assert_fail ("Name.getNameKind() == DeclarationName::Identifier" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 7756, __PRETTY_FUNCTION__)); |
7757 | |
7758 | bool foundSameNameMethod = false; |
7759 | SmallVector<CXXMethodDecl *, 8> overloadedMethods; |
7760 | for (Path.Decls = BaseRecord->lookup(Name); !Path.Decls.empty(); |
7761 | Path.Decls = Path.Decls.slice(1)) { |
7762 | NamedDecl *D = Path.Decls.front(); |
7763 | if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { |
7764 | MD = MD->getCanonicalDecl(); |
7765 | foundSameNameMethod = true; |
7766 | // Interested only in hidden virtual methods. |
7767 | if (!MD->isVirtual()) |
7768 | continue; |
7769 | // If the method we are checking overrides a method from its base |
7770 | // don't warn about the other overloaded methods. Clang deviates from |
7771 | // GCC by only diagnosing overloads of inherited virtual functions that |
7772 | // do not override any other virtual functions in the base. GCC's |
7773 | // -Woverloaded-virtual diagnoses any derived function hiding a virtual |
7774 | // function from a base class. These cases may be better served by a |
7775 | // warning (not specific to virtual functions) on call sites when the |
7776 | // call would select a different function from the base class, were it |
7777 | // visible. |
7778 | // See FIXME in test/SemaCXX/warn-overload-virtual.cpp for an example. |
7779 | if (!S->IsOverload(Method, MD, false)) |
7780 | return true; |
7781 | // Collect the overload only if its hidden. |
7782 | if (!CheckMostOverridenMethods(MD, OverridenAndUsingBaseMethods)) |
7783 | overloadedMethods.push_back(MD); |
7784 | } |
7785 | } |
7786 | |
7787 | if (foundSameNameMethod) |
7788 | OverloadedMethods.append(overloadedMethods.begin(), |
7789 | overloadedMethods.end()); |
7790 | return foundSameNameMethod; |
7791 | } |
7792 | }; |
7793 | } // end anonymous namespace |
7794 | |
7795 | /// Add the most overriden methods from MD to Methods |
7796 | static void AddMostOverridenMethods(const CXXMethodDecl *MD, |
7797 | llvm::SmallPtrSetImpl<const CXXMethodDecl *>& Methods) { |
7798 | if (MD->size_overridden_methods() == 0) |
7799 | Methods.insert(MD->getCanonicalDecl()); |
7800 | else |
7801 | for (const CXXMethodDecl *O : MD->overridden_methods()) |
7802 | AddMostOverridenMethods(O, Methods); |
7803 | } |
7804 | |
7805 | /// Check if a method overloads virtual methods in a base class without |
7806 | /// overriding any. |
7807 | void Sema::FindHiddenVirtualMethods(CXXMethodDecl *MD, |
7808 | SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) { |
7809 | if (!MD->getDeclName().isIdentifier()) |
7810 | return; |
7811 | |
7812 | CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. |
7813 | /*bool RecordPaths=*/false, |
7814 | /*bool DetectVirtual=*/false); |
7815 | FindHiddenVirtualMethod FHVM; |
7816 | FHVM.Method = MD; |
7817 | FHVM.S = this; |
7818 | |
7819 | // Keep the base methods that were overridden or introduced in the subclass |
7820 | // by 'using' in a set. A base method not in this set is hidden. |
7821 | CXXRecordDecl *DC = MD->getParent(); |
7822 | DeclContext::lookup_result R = DC->lookup(MD->getDeclName()); |
7823 | for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) { |
7824 | NamedDecl *ND = *I; |
7825 | if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I)) |
7826 | ND = shad->getTargetDecl(); |
7827 | if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) |
7828 | AddMostOverridenMethods(MD, FHVM.OverridenAndUsingBaseMethods); |
7829 | } |
7830 | |
7831 | if (DC->lookupInBases(FHVM, Paths)) |
7832 | OverloadedMethods = FHVM.OverloadedMethods; |
7833 | } |
7834 | |
7835 | void Sema::NoteHiddenVirtualMethods(CXXMethodDecl *MD, |
7836 | SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) { |
7837 | for (unsigned i = 0, e = OverloadedMethods.size(); i != e; ++i) { |
7838 | CXXMethodDecl *overloadedMD = OverloadedMethods[i]; |
7839 | PartialDiagnostic PD = PDiag( |
7840 | diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; |
7841 | HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType()); |
7842 | Diag(overloadedMD->getLocation(), PD); |
7843 | } |
7844 | } |
7845 | |
7846 | /// Diagnose methods which overload virtual methods in a base class |
7847 | /// without overriding any. |
7848 | void Sema::DiagnoseHiddenVirtualMethods(CXXMethodDecl *MD) { |
7849 | if (MD->isInvalidDecl()) |
7850 | return; |
7851 | |
7852 | if (Diags.isIgnored(diag::warn_overloaded_virtual, MD->getLocation())) |
7853 | return; |
7854 | |
7855 | SmallVector<CXXMethodDecl *, 8> OverloadedMethods; |
7856 | FindHiddenVirtualMethods(MD, OverloadedMethods); |
7857 | if (!OverloadedMethods.empty()) { |
7858 | Diag(MD->getLocation(), diag::warn_overloaded_virtual) |
7859 | << MD << (OverloadedMethods.size() > 1); |
7860 | |
7861 | NoteHiddenVirtualMethods(MD, OverloadedMethods); |
7862 | } |
7863 | } |
7864 | |
7865 | void Sema::checkIllFormedTrivialABIStruct(CXXRecordDecl &RD) { |
7866 | auto PrintDiagAndRemoveAttr = [&]() { |
7867 | // No diagnostics if this is a template instantiation. |
7868 | if (!isTemplateInstantiation(RD.getTemplateSpecializationKind())) |
7869 | Diag(RD.getAttr<TrivialABIAttr>()->getLocation(), |
7870 | diag::ext_cannot_use_trivial_abi) << &RD; |
7871 | RD.dropAttr<TrivialABIAttr>(); |
7872 | }; |
7873 | |
7874 | // Ill-formed if the struct has virtual functions. |
7875 | if (RD.isPolymorphic()) { |
7876 | PrintDiagAndRemoveAttr(); |
7877 | return; |
7878 | } |
7879 | |
7880 | for (const auto &B : RD.bases()) { |
7881 | // Ill-formed if the base class is non-trivial for the purpose of calls or a |
7882 | // virtual base. |
7883 | if ((!B.getType()->isDependentType() && |
7884 | !B.getType()->getAsCXXRecordDecl()->canPassInRegisters()) || |
7885 | B.isVirtual()) { |
7886 | PrintDiagAndRemoveAttr(); |
7887 | return; |
7888 | } |
7889 | } |
7890 | |
7891 | for (const auto *FD : RD.fields()) { |
7892 | // Ill-formed if the field is an ObjectiveC pointer or of a type that is |
7893 | // non-trivial for the purpose of calls. |
7894 | QualType FT = FD->getType(); |
7895 | if (FT.getObjCLifetime() == Qualifiers::OCL_Weak) { |
7896 | PrintDiagAndRemoveAttr(); |
7897 | return; |
7898 | } |
7899 | |
7900 | if (const auto *RT = FT->getBaseElementTypeUnsafe()->getAs<RecordType>()) |
7901 | if (!RT->isDependentType() && |
7902 | !cast<CXXRecordDecl>(RT->getDecl())->canPassInRegisters()) { |
7903 | PrintDiagAndRemoveAttr(); |
7904 | return; |
7905 | } |
7906 | } |
7907 | } |
7908 | |
7909 | void Sema::ActOnFinishCXXMemberSpecification( |
7910 | Scope *S, SourceLocation RLoc, Decl *TagDecl, SourceLocation LBrac, |
7911 | SourceLocation RBrac, const ParsedAttributesView &AttrList) { |
7912 | if (!TagDecl) |
7913 | return; |
7914 | |
7915 | AdjustDeclIfTemplate(TagDecl); |
7916 | |
7917 | for (const ParsedAttr &AL : AttrList) { |
7918 | if (AL.getKind() != ParsedAttr::AT_Visibility) |
7919 | continue; |
7920 | AL.setInvalid(); |
7921 | Diag(AL.getLoc(), diag::warn_attribute_after_definition_ignored) |
7922 | << AL.getName(); |
7923 | } |
7924 | |
7925 | ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( |
7926 | // strict aliasing violation! |
7927 | reinterpret_cast<Decl**>(FieldCollector->getCurFields()), |
7928 | FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); |
7929 | |
7930 | CheckCompletedCXXClass(cast<CXXRecordDecl>(TagDecl)); |
7931 | } |
7932 | |
7933 | /// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared |
7934 | /// special functions, such as the default constructor, copy |
7935 | /// constructor, or destructor, to the given C++ class (C++ |
7936 | /// [special]p1). This routine can only be executed just before the |
7937 | /// definition of the class is complete. |
7938 | void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { |
7939 | if (ClassDecl->needsImplicitDefaultConstructor()) { |
7940 | ++getASTContext().NumImplicitDefaultConstructors; |
7941 | |
7942 | if (ClassDecl->hasInheritedConstructor()) |
7943 | DeclareImplicitDefaultConstructor(ClassDecl); |
7944 | } |
7945 | |
7946 | if (ClassDecl->needsImplicitCopyConstructor()) { |
7947 | ++getASTContext().NumImplicitCopyConstructors; |
7948 | |
7949 | // If the properties or semantics of the copy constructor couldn't be |
7950 | // determined while the class was being declared, force a declaration |
7951 | // of it now. |
7952 | if (ClassDecl->needsOverloadResolutionForCopyConstructor() || |
7953 | ClassDecl->hasInheritedConstructor()) |
7954 | DeclareImplicitCopyConstructor(ClassDecl); |
7955 | // For the MS ABI we need to know whether the copy ctor is deleted. A |
7956 | // prerequisite for deleting the implicit copy ctor is that the class has a |
7957 | // move ctor or move assignment that is either user-declared or whose |
7958 | // semantics are inherited from a subobject. FIXME: We should provide a more |
7959 | // direct way for CodeGen to ask whether the constructor was deleted. |
7960 | else if (Context.getTargetInfo().getCXXABI().isMicrosoft() && |
7961 | (ClassDecl->hasUserDeclaredMoveConstructor() || |
7962 | ClassDecl->needsOverloadResolutionForMoveConstructor() || |
7963 | ClassDecl->hasUserDeclaredMoveAssignment() || |
7964 | ClassDecl->needsOverloadResolutionForMoveAssignment())) |
7965 | DeclareImplicitCopyConstructor(ClassDecl); |
7966 | } |
7967 | |
7968 | if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) { |
7969 | ++getASTContext().NumImplicitMoveConstructors; |
7970 | |
7971 | if (ClassDecl->needsOverloadResolutionForMoveConstructor() || |
7972 | ClassDecl->hasInheritedConstructor()) |
7973 | DeclareImplicitMoveConstructor(ClassDecl); |
7974 | } |
7975 | |
7976 | if (ClassDecl->needsImplicitCopyAssignment()) { |
7977 | ++getASTContext().NumImplicitCopyAssignmentOperators; |
7978 | |
7979 | // If we have a dynamic class, then the copy assignment operator may be |
7980 | // virtual, so we have to declare it immediately. This ensures that, e.g., |
7981 | // it shows up in the right place in the vtable and that we diagnose |
7982 | // problems with the implicit exception specification. |
7983 | if (ClassDecl->isDynamicClass() || |
7984 | ClassDecl->needsOverloadResolutionForCopyAssignment() || |
7985 | ClassDecl->hasInheritedAssignment()) |
7986 | DeclareImplicitCopyAssignment(ClassDecl); |
7987 | } |
7988 | |
7989 | if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) { |
7990 | ++getASTContext().NumImplicitMoveAssignmentOperators; |
7991 | |
7992 | // Likewise for the move assignment operator. |
7993 | if (ClassDecl->isDynamicClass() || |
7994 | ClassDecl->needsOverloadResolutionForMoveAssignment() || |
7995 | ClassDecl->hasInheritedAssignment()) |
7996 | DeclareImplicitMoveAssignment(ClassDecl); |
7997 | } |
7998 | |
7999 | if (ClassDecl->needsImplicitDestructor()) { |
8000 | ++getASTContext().NumImplicitDestructors; |
8001 | |
8002 | // If we have a dynamic class, then the destructor may be virtual, so we |
8003 | // have to declare the destructor immediately. This ensures that, e.g., it |
8004 | // shows up in the right place in the vtable and that we diagnose problems |
8005 | // with the implicit exception specification. |
8006 | if (ClassDecl->isDynamicClass() || |
8007 | ClassDecl->needsOverloadResolutionForDestructor()) |
8008 | DeclareImplicitDestructor(ClassDecl); |
8009 | } |
8010 | } |
8011 | |
8012 | unsigned Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { |
8013 | if (!D) |
8014 | return 0; |
8015 | |
8016 | // The order of template parameters is not important here. All names |
8017 | // get added to the same scope. |
8018 | SmallVector<TemplateParameterList *, 4> ParameterLists; |
8019 | |
8020 | if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D)) |
8021 | D = TD->getTemplatedDecl(); |
8022 | |
8023 | if (auto *PSD = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) |
8024 | ParameterLists.push_back(PSD->getTemplateParameters()); |
8025 | |
8026 | if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)) { |
8027 | for (unsigned i = 0; i < DD->getNumTemplateParameterLists(); ++i) |
8028 | ParameterLists.push_back(DD->getTemplateParameterList(i)); |
8029 | |
8030 | if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { |
8031 | if (FunctionTemplateDecl *FTD = FD->getDescribedFunctionTemplate()) |
8032 | ParameterLists.push_back(FTD->getTemplateParameters()); |
8033 | } |
8034 | } |
8035 | |
8036 | if (TagDecl *TD = dyn_cast<TagDecl>(D)) { |
8037 | for (unsigned i = 0; i < TD->getNumTemplateParameterLists(); ++i) |
8038 | ParameterLists.push_back(TD->getTemplateParameterList(i)); |
8039 | |
8040 | if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) { |
8041 | if (ClassTemplateDecl *CTD = RD->getDescribedClassTemplate()) |
8042 | ParameterLists.push_back(CTD->getTemplateParameters()); |
8043 | } |
8044 | } |
8045 | |
8046 | unsigned Count = 0; |
8047 | for (TemplateParameterList *Params : ParameterLists) { |
8048 | if (Params->size() > 0) |
8049 | // Ignore explicit specializations; they don't contribute to the template |
8050 | // depth. |
8051 | ++Count; |
8052 | for (NamedDecl *Param : *Params) { |
8053 | if (Param->getDeclName()) { |
8054 | S->AddDecl(Param); |
8055 | IdResolver.AddDecl(Param); |
8056 | } |
8057 | } |
8058 | } |
8059 | |
8060 | return Count; |
8061 | } |
8062 | |
8063 | void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { |
8064 | if (!RecordD) return; |
8065 | AdjustDeclIfTemplate(RecordD); |
8066 | CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); |
8067 | PushDeclContext(S, Record); |
8068 | } |
8069 | |
8070 | void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { |
8071 | if (!RecordD) return; |
8072 | PopDeclContext(); |
8073 | } |
8074 | |
8075 | /// This is used to implement the constant expression evaluation part of the |
8076 | /// attribute enable_if extension. There is nothing in standard C++ which would |
8077 | /// require reentering parameters. |
8078 | void Sema::ActOnReenterCXXMethodParameter(Scope *S, ParmVarDecl *Param) { |
8079 | if (!Param) |
8080 | return; |
8081 | |
8082 | S->AddDecl(Param); |
8083 | if (Param->getDeclName()) |
8084 | IdResolver.AddDecl(Param); |
8085 | } |
8086 | |
8087 | /// ActOnStartDelayedCXXMethodDeclaration - We have completed |
8088 | /// parsing a top-level (non-nested) C++ class, and we are now |
8089 | /// parsing those parts of the given Method declaration that could |
8090 | /// not be parsed earlier (C++ [class.mem]p2), such as default |
8091 | /// arguments. This action should enter the scope of the given |
8092 | /// Method declaration as if we had just parsed the qualified method |
8093 | /// name. However, it should not bring the parameters into scope; |
8094 | /// that will be performed by ActOnDelayedCXXMethodParameter. |
8095 | void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { |
8096 | } |
8097 | |
8098 | /// ActOnDelayedCXXMethodParameter - We've already started a delayed |
8099 | /// C++ method declaration. We're (re-)introducing the given |
8100 | /// function parameter into scope for use in parsing later parts of |
8101 | /// the method declaration. For example, we could see an |
8102 | /// ActOnParamDefaultArgument event for this parameter. |
8103 | void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { |
8104 | if (!ParamD) |
8105 | return; |
8106 | |
8107 | ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); |
8108 | |
8109 | // If this parameter has an unparsed default argument, clear it out |
8110 | // to make way for the parsed default argument. |
8111 | if (Param->hasUnparsedDefaultArg()) |
8112 | Param->setDefaultArg(nullptr); |
8113 | |
8114 | S->AddDecl(Param); |
8115 | if (Param->getDeclName()) |
8116 | IdResolver.AddDecl(Param); |
8117 | } |
8118 | |
8119 | /// ActOnFinishDelayedCXXMethodDeclaration - We have finished |
8120 | /// processing the delayed method declaration for Method. The method |
8121 | /// declaration is now considered finished. There may be a separate |
8122 | /// ActOnStartOfFunctionDef action later (not necessarily |
8123 | /// immediately!) for this method, if it was also defined inside the |
8124 | /// class body. |
8125 | void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { |
8126 | if (!MethodD) |
8127 | return; |
8128 | |
8129 | AdjustDeclIfTemplate(MethodD); |
8130 | |
8131 | FunctionDecl *Method = cast<FunctionDecl>(MethodD); |
8132 | |
8133 | // Now that we have our default arguments, check the constructor |
8134 | // again. It could produce additional diagnostics or affect whether |
8135 | // the class has implicitly-declared destructors, among other |
8136 | // things. |
8137 | if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) |
8138 | CheckConstructor(Constructor); |
8139 | |
8140 | // Check the default arguments, which we may have added. |
8141 | if (!Method->isInvalidDecl()) |
8142 | CheckCXXDefaultArguments(Method); |
8143 | } |
8144 | |
8145 | /// CheckConstructorDeclarator - Called by ActOnDeclarator to check |
8146 | /// the well-formedness of the constructor declarator @p D with type @p |
8147 | /// R. If there are any errors in the declarator, this routine will |
8148 | /// emit diagnostics and set the invalid bit to true. In any case, the type |
8149 | /// will be updated to reflect a well-formed type for the constructor and |
8150 | /// returned. |
8151 | QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, |
8152 | StorageClass &SC) { |
8153 | bool isVirtual = D.getDeclSpec().isVirtualSpecified(); |
8154 | |
8155 | // C++ [class.ctor]p3: |
8156 | // A constructor shall not be virtual (10.3) or static (9.4). A |
8157 | // constructor can be invoked for a const, volatile or const |
8158 | // volatile object. A constructor shall not be declared const, |
8159 | // volatile, or const volatile (9.3.2). |
8160 | if (isVirtual) { |
8161 | if (!D.isInvalidType()) |
8162 | Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) |
8163 | << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) |
8164 | << SourceRange(D.getIdentifierLoc()); |
8165 | D.setInvalidType(); |
8166 | } |
8167 | if (SC == SC_Static) { |
8168 | if (!D.isInvalidType()) |
8169 | Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) |
8170 | << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) |
8171 | << SourceRange(D.getIdentifierLoc()); |
8172 | D.setInvalidType(); |
8173 | SC = SC_None; |
8174 | } |
8175 | |
8176 | if (unsigned TypeQuals = D.getDeclSpec().getTypeQualifiers()) { |
8177 | diagnoseIgnoredQualifiers( |
8178 | diag::err_constructor_return_type, TypeQuals, SourceLocation(), |
8179 | D.getDeclSpec().getConstSpecLoc(), D.getDeclSpec().getVolatileSpecLoc(), |
8180 | D.getDeclSpec().getRestrictSpecLoc(), |
8181 | D.getDeclSpec().getAtomicSpecLoc()); |
8182 | D.setInvalidType(); |
8183 | } |
8184 | |
8185 | DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); |
8186 | if (FTI.hasMethodTypeQualifiers()) { |
8187 | FTI.MethodQualifiers->forEachQualifier( |
8188 | [&](DeclSpec::TQ TypeQual, StringRef QualName, SourceLocation SL) { |
8189 | Diag(SL, diag::err_invalid_qualified_constructor) |
8190 | << QualName << SourceRange(SL); |
8191 | }); |
8192 | D.setInvalidType(); |
8193 | } |
8194 | |
8195 | // C++0x [class.ctor]p4: |
8196 | // A constructor shall not be declared with a ref-qualifier. |
8197 | if (FTI.hasRefQualifier()) { |
8198 | Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) |
8199 | << FTI.RefQualifierIsLValueRef |
8200 | << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); |
8201 | D.setInvalidType(); |
8202 | } |
8203 | |
8204 | // Rebuild the function type "R" without any type qualifiers (in |
8205 | // case any of the errors above fired) and with "void" as the |
8206 | // return type, since constructors don't have return types. |
8207 | const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); |
8208 | if (Proto->getReturnType() == Context.VoidTy && !D.isInvalidType()) |
8209 | return R; |
8210 | |
8211 | FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); |
8212 | EPI.TypeQuals = Qualifiers(); |
8213 | EPI.RefQualifier = RQ_None; |
8214 | |
8215 | return Context.getFunctionType(Context.VoidTy, Proto->getParamTypes(), EPI); |
8216 | } |
8217 | |
8218 | /// CheckConstructor - Checks a fully-formed constructor for |
8219 | /// well-formedness, issuing any diagnostics required. Returns true if |
8220 | /// the constructor declarator is invalid. |
8221 | void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { |
8222 | CXXRecordDecl *ClassDecl |
8223 | = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); |
8224 | if (!ClassDecl) |
8225 | return Constructor->setInvalidDecl(); |
8226 | |
8227 | // C++ [class.copy]p3: |
8228 | // A declaration of a constructor for a class X is ill-formed if |
8229 | // its first parameter is of type (optionally cv-qualified) X and |
8230 | // either there are no other parameters or else all other |
8231 | // parameters have default arguments. |
8232 | if (!Constructor->isInvalidDecl() && |
8233 | ((Constructor->getNumParams() == 1) || |
8234 | (Constructor->getNumParams() > 1 && |
8235 | Constructor->getParamDecl(1)->hasDefaultArg())) && |
8236 | Constructor->getTemplateSpecializationKind() |
8237 | != TSK_ImplicitInstantiation) { |
8238 | QualType ParamType = Constructor->getParamDecl(0)->getType(); |
8239 | QualType ClassTy = Context.getTagDeclType(ClassDecl); |
8240 | if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { |
8241 | SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); |
8242 | const char *ConstRef |
8243 | = Constructor->getParamDecl(0)->getIdentifier() ? "const &" |
8244 | : " const &"; |
8245 | Diag(ParamLoc, diag::err_constructor_byvalue_arg) |
8246 | << FixItHint::CreateInsertion(ParamLoc, ConstRef); |
8247 | |
8248 | // FIXME: Rather that making the constructor invalid, we should endeavor |
8249 | // to fix the type. |
8250 | Constructor->setInvalidDecl(); |
8251 | } |
8252 | } |
8253 | } |
8254 | |
8255 | /// CheckDestructor - Checks a fully-formed destructor definition for |
8256 | /// well-formedness, issuing any diagnostics required. Returns true |
8257 | /// on error. |
8258 | bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { |
8259 | CXXRecordDecl *RD = Destructor->getParent(); |
8260 | |
8261 | if (!Destructor->getOperatorDelete() && Destructor->isVirtual()) { |
8262 | SourceLocation Loc; |
8263 | |
8264 | if (!Destructor->isImplicit()) |
8265 | Loc = Destructor->getLocation(); |
8266 | else |
8267 | Loc = RD->getLocation(); |
8268 | |
8269 | // If we have a virtual destructor, look up the deallocation function |
8270 | if (FunctionDecl *OperatorDelete = |
8271 | FindDeallocationFunctionForDestructor(Loc, RD)) { |
8272 | Expr *ThisArg = nullptr; |
8273 | |
8274 | // If the notional 'delete this' expression requires a non-trivial |
8275 | // conversion from 'this' to the type of a destroying operator delete's |
8276 | // first parameter, perform that conversion now. |
8277 | if (OperatorDelete->isDestroyingOperatorDelete()) { |
8278 | QualType ParamType = OperatorDelete->getParamDecl(0)->getType(); |
8279 | if (!declaresSameEntity(ParamType->getAsCXXRecordDecl(), RD)) { |
8280 | // C++ [class.dtor]p13: |
8281 | // ... as if for the expression 'delete this' appearing in a |
8282 | // non-virtual destructor of the destructor's class. |
8283 | ContextRAII SwitchContext(*this, Destructor); |
8284 | ExprResult This = |
8285 | ActOnCXXThis(OperatorDelete->getParamDecl(0)->getLocation()); |
8286 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 8286, __PRETTY_FUNCTION__)); |
8287 | This = PerformImplicitConversion(This.get(), ParamType, AA_Passing); |
8288 | if (This.isInvalid()) { |
8289 | // FIXME: Register this as a context note so that it comes out |
8290 | // in the right order. |
8291 | Diag(Loc, diag::note_implicit_delete_this_in_destructor_here); |
8292 | return true; |
8293 | } |
8294 | ThisArg = This.get(); |
8295 | } |
8296 | } |
8297 | |
8298 | DiagnoseUseOfDecl(OperatorDelete, Loc); |
8299 | MarkFunctionReferenced(Loc, OperatorDelete); |
8300 | Destructor->setOperatorDelete(OperatorDelete, ThisArg); |
8301 | } |
8302 | } |
8303 | |
8304 | return false; |
8305 | } |
8306 | |
8307 | /// CheckDestructorDeclarator - Called by ActOnDeclarator to check |
8308 | /// the well-formednes of the destructor declarator @p D with type @p |
8309 | /// R. If there are any errors in the declarator, this routine will |
8310 | /// emit diagnostics and set the declarator to invalid. Even if this happens, |
8311 | /// will be updated to reflect a well-formed type for the destructor and |
8312 | /// returned. |
8313 | QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, |
8314 | StorageClass& SC) { |
8315 | // C++ [class.dtor]p1: |
8316 | // [...] A typedef-name that names a class is a class-name |
8317 | // (7.1.3); however, a typedef-name that names a class shall not |
8318 | // be used as the identifier in the declarator for a destructor |
8319 | // declaration. |
8320 | QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); |
8321 | if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) |
8322 | Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) |
8323 | << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); |
8324 | else if (const TemplateSpecializationType *TST = |
8325 | DeclaratorType->getAs<TemplateSpecializationType>()) |
8326 | if (TST->isTypeAlias()) |
8327 | Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) |
8328 | << DeclaratorType << 1; |
8329 | |
8330 | // C++ [class.dtor]p2: |
8331 | // A destructor is used to destroy objects of its class type. A |
8332 | // destructor takes no parameters, and no return type can be |
8333 | // specified for it (not even void). The address of a destructor |
8334 | // shall not be taken. A destructor shall not be static. A |
8335 | // destructor can be invoked for a const, volatile or const |
8336 | // volatile object. A destructor shall not be declared const, |
8337 | // volatile or const volatile (9.3.2). |
8338 | if (SC == SC_Static) { |
8339 | if (!D.isInvalidType()) |
8340 | Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) |
8341 | << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) |
8342 | << SourceRange(D.getIdentifierLoc()) |
8343 | << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); |
8344 | |
8345 | SC = SC_None; |
8346 | } |
8347 | if (!D.isInvalidType()) { |
8348 | // Destructors don't have return types, but the parser will |
8349 | // happily parse something like: |
8350 | // |
8351 | // class X { |
8352 | // float ~X(); |
8353 | // }; |
8354 | // |
8355 | // The return type will be eliminated later. |
8356 | if (D.getDeclSpec().hasTypeSpecifier()) |
8357 | Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) |
8358 | << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) |
8359 | << SourceRange(D.getIdentifierLoc()); |
8360 | else if (unsigned TypeQuals = D.getDeclSpec().getTypeQualifiers()) { |
8361 | diagnoseIgnoredQualifiers(diag::err_destructor_return_type, TypeQuals, |
8362 | SourceLocation(), |
8363 | D.getDeclSpec().getConstSpecLoc(), |
8364 | D.getDeclSpec().getVolatileSpecLoc(), |
8365 | D.getDeclSpec().getRestrictSpecLoc(), |
8366 | D.getDeclSpec().getAtomicSpecLoc()); |
8367 | D.setInvalidType(); |
8368 | } |
8369 | } |
8370 | |
8371 | DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); |
8372 | if (FTI.hasMethodTypeQualifiers() && !D.isInvalidType()) { |
8373 | FTI.MethodQualifiers->forEachQualifier( |
8374 | [&](DeclSpec::TQ TypeQual, StringRef QualName, SourceLocation SL) { |
8375 | Diag(SL, diag::err_invalid_qualified_destructor) |
8376 | << QualName << SourceRange(SL); |
8377 | }); |
8378 | D.setInvalidType(); |
8379 | } |
8380 | |
8381 | // C++0x [class.dtor]p2: |
8382 | // A destructor shall not be declared with a ref-qualifier. |
8383 | if (FTI.hasRefQualifier()) { |
8384 | Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) |
8385 | << FTI.RefQualifierIsLValueRef |
8386 | << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); |
8387 | D.setInvalidType(); |
8388 | } |
8389 | |
8390 | // Make sure we don't have any parameters. |
8391 | if (FTIHasNonVoidParameters(FTI)) { |
8392 | Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); |
8393 | |
8394 | // Delete the parameters. |
8395 | FTI.freeParams(); |
8396 | D.setInvalidType(); |
8397 | } |
8398 | |
8399 | // Make sure the destructor isn't variadic. |
8400 | if (FTI.isVariadic) { |
8401 | Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); |
8402 | D.setInvalidType(); |
8403 | } |
8404 | |
8405 | // Rebuild the function type "R" without any type qualifiers or |
8406 | // parameters (in case any of the errors above fired) and with |
8407 | // "void" as the return type, since destructors don't have return |
8408 | // types. |
8409 | if (!D.isInvalidType()) |
8410 | return R; |
8411 | |
8412 | const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); |
8413 | FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); |
8414 | EPI.Variadic = false; |
8415 | EPI.TypeQuals = Qualifiers(); |
8416 | EPI.RefQualifier = RQ_None; |
8417 | return Context.getFunctionType(Context.VoidTy, None, EPI); |
8418 | } |
8419 | |
8420 | static void extendLeft(SourceRange &R, SourceRange Before) { |
8421 | if (Before.isInvalid()) |
8422 | return; |
8423 | R.setBegin(Before.getBegin()); |
8424 | if (R.getEnd().isInvalid()) |
8425 | R.setEnd(Before.getEnd()); |
8426 | } |
8427 | |
8428 | static void extendRight(SourceRange &R, SourceRange After) { |
8429 | if (After.isInvalid()) |
8430 | return; |
8431 | if (R.getBegin().isInvalid()) |
8432 | R.setBegin(After.getBegin()); |
8433 | R.setEnd(After.getEnd()); |
8434 | } |
8435 | |
8436 | /// CheckConversionDeclarator - Called by ActOnDeclarator to check the |
8437 | /// well-formednes of the conversion function declarator @p D with |
8438 | /// type @p R. If there are any errors in the declarator, this routine |
8439 | /// will emit diagnostics and return true. Otherwise, it will return |
8440 | /// false. Either way, the type @p R will be updated to reflect a |
8441 | /// well-formed type for the conversion operator. |
8442 | void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, |
8443 | StorageClass& SC) { |
8444 | // C++ [class.conv.fct]p1: |
8445 | // Neither parameter types nor return type can be specified. The |
8446 | // type of a conversion function (8.3.5) is "function taking no |
8447 | // parameter returning conversion-type-id." |
8448 | if (SC == SC_Static) { |
8449 | if (!D.isInvalidType()) |
8450 | Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) |
8451 | << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) |
8452 | << D.getName().getSourceRange(); |
8453 | D.setInvalidType(); |
8454 | SC = SC_None; |
8455 | } |
8456 | |
8457 | TypeSourceInfo *ConvTSI = nullptr; |
8458 | QualType ConvType = |
8459 | GetTypeFromParser(D.getName().ConversionFunctionId, &ConvTSI); |
8460 | |
8461 | const DeclSpec &DS = D.getDeclSpec(); |
8462 | if (DS.hasTypeSpecifier() && !D.isInvalidType()) { |
8463 | // Conversion functions don't have return types, but the parser will |
8464 | // happily parse something like: |
8465 | // |
8466 | // class X { |
8467 | // float operator bool(); |
8468 | // }; |
8469 | // |
8470 | // The return type will be changed later anyway. |
8471 | Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) |
8472 | << SourceRange(DS.getTypeSpecTypeLoc()) |
8473 | << SourceRange(D.getIdentifierLoc()); |
8474 | D.setInvalidType(); |
8475 | } else if (DS.getTypeQualifiers() && !D.isInvalidType()) { |
8476 | // It's also plausible that the user writes type qualifiers in the wrong |
8477 | // place, such as: |
8478 | // struct S { const operator int(); }; |
8479 | // FIXME: we could provide a fixit to move the qualifiers onto the |
8480 | // conversion type. |
8481 | Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) |
8482 | << SourceRange(D.getIdentifierLoc()) << 0; |
8483 | D.setInvalidType(); |
8484 | } |
8485 | |
8486 | const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); |
8487 | |
8488 | // Make sure we don't have any parameters. |
8489 | if (Proto->getNumParams() > 0) { |
8490 | Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); |
8491 | |
8492 | // Delete the parameters. |
8493 | D.getFunctionTypeInfo().freeParams(); |
8494 | D.setInvalidType(); |
8495 | } else if (Proto->isVariadic()) { |
8496 | Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); |
8497 | D.setInvalidType(); |
8498 | } |
8499 | |
8500 | // Diagnose "&operator bool()" and other such nonsense. This |
8501 | // is actually a gcc extension which we don't support. |
8502 | if (Proto->getReturnType() != ConvType) { |
8503 | bool NeedsTypedef = false; |
8504 | SourceRange Before, After; |
8505 | |
8506 | // Walk the chunks and extract information on them for our diagnostic. |
8507 | bool PastFunctionChunk = false; |
8508 | for (auto &Chunk : D.type_objects()) { |
8509 | switch (Chunk.Kind) { |
8510 | case DeclaratorChunk::Function: |
8511 | if (!PastFunctionChunk) { |
8512 | if (Chunk.Fun.HasTrailingReturnType) { |
8513 | TypeSourceInfo *TRT = nullptr; |
8514 | GetTypeFromParser(Chunk.Fun.getTrailingReturnType(), &TRT); |
8515 | if (TRT) extendRight(After, TRT->getTypeLoc().getSourceRange()); |
8516 | } |
8517 | PastFunctionChunk = true; |
8518 | break; |
8519 | } |
8520 | LLVM_FALLTHROUGH[[clang::fallthrough]]; |
8521 | case DeclaratorChunk::Array: |
8522 | NeedsTypedef = true; |
8523 | extendRight(After, Chunk.getSourceRange()); |
8524 | break; |
8525 | |
8526 | case DeclaratorChunk::Pointer: |
8527 | case DeclaratorChunk::BlockPointer: |
8528 | case DeclaratorChunk::Reference: |
8529 | case DeclaratorChunk::MemberPointer: |
8530 | case DeclaratorChunk::Pipe: |
8531 | extendLeft(Before, Chunk.getSourceRange()); |
8532 | break; |
8533 | |
8534 | case DeclaratorChunk::Paren: |
8535 | extendLeft(Before, Chunk.Loc); |
8536 | extendRight(After, Chunk.EndLoc); |
8537 | break; |
8538 | } |
8539 | } |
8540 | |
8541 | SourceLocation Loc = Before.isValid() ? Before.getBegin() : |
8542 | After.isValid() ? After.getBegin() : |
8543 | D.getIdentifierLoc(); |
8544 | auto &&DB = Diag(Loc, diag::err_conv_function_with_complex_decl); |
8545 | DB << Before << After; |
8546 | |
8547 | if (!NeedsTypedef) { |
8548 | DB << /*don't need a typedef*/0; |
8549 | |
8550 | // If we can provide a correct fix-it hint, do so. |
8551 | if (After.isInvalid() && ConvTSI) { |
8552 | SourceLocation InsertLoc = |
8553 | getLocForEndOfToken(ConvTSI->getTypeLoc().getEndLoc()); |
8554 | DB << FixItHint::CreateInsertion(InsertLoc, " ") |
8555 | << FixItHint::CreateInsertionFromRange( |
8556 | InsertLoc, CharSourceRange::getTokenRange(Before)) |
8557 | << FixItHint::CreateRemoval(Before); |
8558 | } |
8559 | } else if (!Proto->getReturnType()->isDependentType()) { |
8560 | DB << /*typedef*/1 << Proto->getReturnType(); |
8561 | } else if (getLangOpts().CPlusPlus11) { |
8562 | DB << /*alias template*/2 << Proto->getReturnType(); |
8563 | } else { |
8564 | DB << /*might not be fixable*/3; |
8565 | } |
8566 | |
8567 | // Recover by incorporating the other type chunks into the result type. |
8568 | // Note, this does *not* change the name of the function. This is compatible |
8569 | // with the GCC extension: |
8570 | // struct S { &operator int(); } s; |
8571 | // int &r = s.operator int(); // ok in GCC |
8572 | // S::operator int&() {} // error in GCC, function name is 'operator int'. |
8573 | ConvType = Proto->getReturnType(); |
8574 | } |
8575 | |
8576 | // C++ [class.conv.fct]p4: |
8577 | // The conversion-type-id shall not represent a function type nor |
8578 | // an array type. |
8579 | if (ConvType->isArrayType()) { |
8580 | Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); |
8581 | ConvType = Context.getPointerType(ConvType); |
8582 | D.setInvalidType(); |
8583 | } else if (ConvType->isFunctionType()) { |
8584 | Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); |
8585 | ConvType = Context.getPointerType(ConvType); |
8586 | D.setInvalidType(); |
8587 | } |
8588 | |
8589 | // Rebuild the function type "R" without any parameters (in case any |
8590 | // of the errors above fired) and with the conversion type as the |
8591 | // return type. |
8592 | if (D.isInvalidType()) |
8593 | R = Context.getFunctionType(ConvType, None, Proto->getExtProtoInfo()); |
8594 | |
8595 | // C++0x explicit conversion operators. |
8596 | if (DS.hasExplicitSpecifier() && !getLangOpts().CPlusPlus2a) |
8597 | Diag(DS.getExplicitSpecLoc(), |
8598 | getLangOpts().CPlusPlus11 |
8599 | ? diag::warn_cxx98_compat_explicit_conversion_functions |
8600 | : diag::ext_explicit_conversion_functions) |
8601 | << SourceRange(DS.getExplicitSpecRange()); |
8602 | } |
8603 | |
8604 | /// ActOnConversionDeclarator - Called by ActOnDeclarator to complete |
8605 | /// the declaration of the given C++ conversion function. This routine |
8606 | /// is responsible for recording the conversion function in the C++ |
8607 | /// class, if possible. |
8608 | Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { |
8609 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 8609, __PRETTY_FUNCTION__)); |
8610 | |
8611 | CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); |
8612 | |
8613 | // Make sure we aren't redeclaring the conversion function. |
8614 | QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); |
8615 | |
8616 | // C++ [class.conv.fct]p1: |
8617 | // [...] A conversion function is never used to convert a |
8618 | // (possibly cv-qualified) object to the (possibly cv-qualified) |
8619 | // same object type (or a reference to it), to a (possibly |
8620 | // cv-qualified) base class of that type (or a reference to it), |
8621 | // or to (possibly cv-qualified) void. |
8622 | // FIXME: Suppress this warning if the conversion function ends up being a |
8623 | // virtual function that overrides a virtual function in a base class. |
8624 | QualType ClassType |
8625 | = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); |
8626 | if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) |
8627 | ConvType = ConvTypeRef->getPointeeType(); |
8628 | if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && |
8629 | Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) |
8630 | /* Suppress diagnostics for instantiations. */; |
8631 | else if (ConvType->isRecordType()) { |
8632 | ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); |
8633 | if (ConvType == ClassType) |
8634 | Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) |
8635 | << ClassType; |
8636 | else if (IsDerivedFrom(Conversion->getLocation(), ClassType, ConvType)) |
8637 | Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) |
8638 | << ClassType << ConvType; |
8639 | } else if (ConvType->isVoidType()) { |
8640 | Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) |
8641 | << ClassType << ConvType; |
8642 | } |
8643 | |
8644 | if (FunctionTemplateDecl *ConversionTemplate |
8645 | = Conversion->getDescribedFunctionTemplate()) |
8646 | return ConversionTemplate; |
8647 | |
8648 | return Conversion; |
8649 | } |
8650 | |
8651 | namespace { |
8652 | /// Utility class to accumulate and print a diagnostic listing the invalid |
8653 | /// specifier(s) on a declaration. |
8654 | struct BadSpecifierDiagnoser { |
8655 | BadSpecifierDiagnoser(Sema &S, SourceLocation Loc, unsigned DiagID) |
8656 | : S(S), Diagnostic(S.Diag(Loc, DiagID)) {} |
8657 | ~BadSpecifierDiagnoser() { |
8658 | Diagnostic << Specifiers; |
8659 | } |
8660 | |
8661 | template<typename T> void check(SourceLocation SpecLoc, T Spec) { |
8662 | return check(SpecLoc, DeclSpec::getSpecifierName(Spec)); |
8663 | } |
8664 | void check(SourceLocation SpecLoc, DeclSpec::TST Spec) { |
8665 | return check(SpecLoc, |
8666 | DeclSpec::getSpecifierName(Spec, S.getPrintingPolicy())); |
8667 | } |
8668 | void check(SourceLocation SpecLoc, const char *Spec) { |
8669 | if (SpecLoc.isInvalid()) return; |
8670 | Diagnostic << SourceRange(SpecLoc, SpecLoc); |
8671 | if (!Specifiers.empty()) Specifiers += " "; |
8672 | Specifiers += Spec; |
8673 | } |
8674 | |
8675 | Sema &S; |
8676 | Sema::SemaDiagnosticBuilder Diagnostic; |
8677 | std::string Specifiers; |
8678 | }; |
8679 | } |
8680 | |
8681 | /// Check the validity of a declarator that we parsed for a deduction-guide. |
8682 | /// These aren't actually declarators in the grammar, so we need to check that |
8683 | /// the user didn't specify any pieces that are not part of the deduction-guide |
8684 | /// grammar. |
8685 | void Sema::CheckDeductionGuideDeclarator(Declarator &D, QualType &R, |
8686 | StorageClass &SC) { |
8687 | TemplateName GuidedTemplate = D.getName().TemplateName.get().get(); |
8688 | TemplateDecl *GuidedTemplateDecl = GuidedTemplate.getAsTemplateDecl(); |
8689 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 8689, __PRETTY_FUNCTION__)); |
8690 | |
8691 | // C++ [temp.deduct.guide]p3: |
8692 | // A deduction-gide shall be declared in the same scope as the |
8693 | // corresponding class template. |
8694 | if (!CurContext->getRedeclContext()->Equals( |
8695 | GuidedTemplateDecl->getDeclContext()->getRedeclContext())) { |
8696 | Diag(D.getIdentifierLoc(), diag::err_deduction_guide_wrong_scope) |
8697 | << GuidedTemplateDecl; |
8698 | Diag(GuidedTemplateDecl->getLocation(), diag::note_template_decl_here); |
8699 | } |
8700 | |
8701 | auto &DS = D.getMutableDeclSpec(); |
8702 | // We leave 'friend' and 'virtual' to be rejected in the normal way. |
8703 | if (DS.hasTypeSpecifier() || DS.getTypeQualifiers() || |
8704 | DS.getStorageClassSpecLoc().isValid() || DS.isInlineSpecified() || |
8705 | DS.isNoreturnSpecified() || DS.isConstexprSpecified()) { |
8706 | BadSpecifierDiagnoser Diagnoser( |
8707 | *this, D.getIdentifierLoc(), |
8708 | diag::err_deduction_guide_invalid_specifier); |
8709 | |
8710 | Diagnoser.check(DS.getStorageClassSpecLoc(), DS.getStorageClassSpec()); |
8711 | DS.ClearStorageClassSpecs(); |
8712 | SC = SC_None; |
8713 | |
8714 | // 'explicit' is permitted. |
8715 | Diagnoser.check(DS.getInlineSpecLoc(), "inline"); |
8716 | Diagnoser.check(DS.getNoreturnSpecLoc(), "_Noreturn"); |
8717 | Diagnoser.check(DS.getConstexprSpecLoc(), "constexpr"); |
8718 | DS.ClearConstexprSpec(); |
8719 | |
8720 | Diagnoser.check(DS.getConstSpecLoc(), "const"); |
8721 | Diagnoser.check(DS.getRestrictSpecLoc(), "__restrict"); |
8722 | Diagnoser.check(DS.getVolatileSpecLoc(), "volatile"); |
8723 | Diagnoser.check(DS.getAtomicSpecLoc(), "_Atomic"); |
8724 | Diagnoser.check(DS.getUnalignedSpecLoc(), "__unaligned"); |
8725 | DS.ClearTypeQualifiers(); |
8726 | |
8727 | Diagnoser.check(DS.getTypeSpecComplexLoc(), DS.getTypeSpecComplex()); |
8728 | Diagnoser.check(DS.getTypeSpecSignLoc(), DS.getTypeSpecSign()); |
8729 | Diagnoser.check(DS.getTypeSpecWidthLoc(), DS.getTypeSpecWidth()); |
8730 | Diagnoser.check(DS.getTypeSpecTypeLoc(), DS.getTypeSpecType()); |
8731 | DS.ClearTypeSpecType(); |
8732 | } |
8733 | |
8734 | if (D.isInvalidType()) |
8735 | return; |
8736 | |
8737 | // Check the declarator is simple enough. |
8738 | bool FoundFunction = false; |
8739 | for (const DeclaratorChunk &Chunk : llvm::reverse(D.type_objects())) { |
8740 | if (Chunk.Kind == DeclaratorChunk::Paren) |
8741 | continue; |
8742 | if (Chunk.Kind != DeclaratorChunk::Function || FoundFunction) { |
8743 | Diag(D.getDeclSpec().getBeginLoc(), |
8744 | diag::err_deduction_guide_with_complex_decl) |
8745 | << D.getSourceRange(); |
8746 | break; |
8747 | } |
8748 | if (!Chunk.Fun.hasTrailingReturnType()) { |
8749 | Diag(D.getName().getBeginLoc(), |
8750 | diag::err_deduction_guide_no_trailing_return_type); |
8751 | break; |
8752 | } |
8753 | |
8754 | // Check that the return type is written as a specialization of |
8755 | // the template specified as the deduction-guide's name. |
8756 | ParsedType TrailingReturnType = Chunk.Fun.getTrailingReturnType(); |
8757 | TypeSourceInfo *TSI = nullptr; |
8758 | QualType RetTy = GetTypeFromParser(TrailingReturnType, &TSI); |
8759 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 8759, __PRETTY_FUNCTION__)); |
8760 | bool AcceptableReturnType = false; |
8761 | bool MightInstantiateToSpecialization = false; |
8762 | if (auto RetTST = |
8763 | TSI->getTypeLoc().getAs<TemplateSpecializationTypeLoc>()) { |
8764 | TemplateName SpecifiedName = RetTST.getTypePtr()->getTemplateName(); |
8765 | bool TemplateMatches = |
8766 | Context.hasSameTemplateName(SpecifiedName, GuidedTemplate); |
8767 | if (SpecifiedName.getKind() == TemplateName::Template && TemplateMatches) |
8768 | AcceptableReturnType = true; |
8769 | else { |
8770 | // This could still instantiate to the right type, unless we know it |
8771 | // names the wrong class template. |
8772 | auto *TD = SpecifiedName.getAsTemplateDecl(); |
8773 | MightInstantiateToSpecialization = !(TD && isa<ClassTemplateDecl>(TD) && |
8774 | !TemplateMatches); |
8775 | } |
8776 | } else if (!RetTy.hasQualifiers() && RetTy->isDependentType()) { |
8777 | MightInstantiateToSpecialization = true; |
8778 | } |
8779 | |
8780 | if (!AcceptableReturnType) { |
8781 | Diag(TSI->getTypeLoc().getBeginLoc(), |
8782 | diag::err_deduction_guide_bad_trailing_return_type) |
8783 | << GuidedTemplate << TSI->getType() |
8784 | << MightInstantiateToSpecialization |
8785 | << TSI->getTypeLoc().getSourceRange(); |
8786 | } |
8787 | |
8788 | // Keep going to check that we don't have any inner declarator pieces (we |
8789 | // could still have a function returning a pointer to a function). |
8790 | FoundFunction = true; |
8791 | } |
8792 | |
8793 | if (D.isFunctionDefinition()) |
8794 | Diag(D.getIdentifierLoc(), diag::err_deduction_guide_defines_function); |
8795 | } |
8796 | |
8797 | //===----------------------------------------------------------------------===// |
8798 | // Namespace Handling |
8799 | //===----------------------------------------------------------------------===// |
8800 | |
8801 | /// Diagnose a mismatch in 'inline' qualifiers when a namespace is |
8802 | /// reopened. |
8803 | static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, |
8804 | SourceLocation Loc, |
8805 | IdentifierInfo *II, bool *IsInline, |
8806 | NamespaceDecl *PrevNS) { |
8807 | assert(*IsInline != PrevNS->isInline())((*IsInline != PrevNS->isInline()) ? static_cast<void> (0) : __assert_fail ("*IsInline != PrevNS->isInline()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 8807, __PRETTY_FUNCTION__)); |
8808 | |
8809 | // HACK: Work around a bug in libstdc++4.6's <atomic>, where |
8810 | // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as |
8811 | // inline namespaces, with the intention of bringing names into namespace std. |
8812 | // |
8813 | // We support this just well enough to get that case working; this is not |
8814 | // sufficient to support reopening namespaces as inline in general. |
8815 | if (*IsInline && II && II->getName().startswith("__atomic") && |
8816 | S.getSourceManager().isInSystemHeader(Loc)) { |
8817 | // Mark all prior declarations of the namespace as inline. |
8818 | for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; |
8819 | NS = NS->getPreviousDecl()) |
8820 | NS->setInline(*IsInline); |
8821 | // Patch up the lookup table for the containing namespace. This isn't really |
8822 | // correct, but it's good enough for this particular case. |
8823 | for (auto *I : PrevNS->decls()) |
8824 | if (auto *ND = dyn_cast<NamedDecl>(I)) |
8825 | PrevNS->getParent()->makeDeclVisibleInContext(ND); |
8826 | return; |
8827 | } |
8828 | |
8829 | if (PrevNS->isInline()) |
8830 | // The user probably just forgot the 'inline', so suggest that it |
8831 | // be added back. |
8832 | S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) |
8833 | << FixItHint::CreateInsertion(KeywordLoc, "inline "); |
8834 | else |
8835 | S.Diag(Loc, diag::err_inline_namespace_mismatch); |
8836 | |
8837 | S.Diag(PrevNS->getLocation(), diag::note_previous_definition); |
8838 | *IsInline = PrevNS->isInline(); |
8839 | } |
8840 | |
8841 | /// ActOnStartNamespaceDef - This is called at the start of a namespace |
8842 | /// definition. |
8843 | Decl *Sema::ActOnStartNamespaceDef( |
8844 | Scope *NamespcScope, SourceLocation InlineLoc, SourceLocation NamespaceLoc, |
8845 | SourceLocation IdentLoc, IdentifierInfo *II, SourceLocation LBrace, |
8846 | const ParsedAttributesView &AttrList, UsingDirectiveDecl *&UD) { |
8847 | SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; |
8848 | // For anonymous namespace, take the location of the left brace. |
8849 | SourceLocation Loc = II ? IdentLoc : LBrace; |
8850 | bool IsInline = InlineLoc.isValid(); |
8851 | bool IsInvalid = false; |
8852 | bool IsStd = false; |
8853 | bool AddToKnown = false; |
8854 | Scope *DeclRegionScope = NamespcScope->getParent(); |
8855 | |
8856 | NamespaceDecl *PrevNS = nullptr; |
8857 | if (II) { |
8858 | // C++ [namespace.def]p2: |
8859 | // The identifier in an original-namespace-definition shall not |
8860 | // have been previously defined in the declarative region in |
8861 | // which the original-namespace-definition appears. The |
8862 | // identifier in an original-namespace-definition is the name of |
8863 | // the namespace. Subsequently in that declarative region, it is |
8864 | // treated as an original-namespace-name. |
8865 | // |
8866 | // Since namespace names are unique in their scope, and we don't |
8867 | // look through using directives, just look for any ordinary names |
8868 | // as if by qualified name lookup. |
8869 | LookupResult R(*this, II, IdentLoc, LookupOrdinaryName, |
8870 | ForExternalRedeclaration); |
8871 | LookupQualifiedName(R, CurContext->getRedeclContext()); |
8872 | NamedDecl *PrevDecl = |
8873 | R.isSingleResult() ? R.getRepresentativeDecl() : nullptr; |
8874 | PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); |
8875 | |
8876 | if (PrevNS) { |
8877 | // This is an extended namespace definition. |
8878 | if (IsInline != PrevNS->isInline()) |
8879 | DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, |
8880 | &IsInline, PrevNS); |
8881 | } else if (PrevDecl) { |
8882 | // This is an invalid name redefinition. |
8883 | Diag(Loc, diag::err_redefinition_different_kind) |
8884 | << II; |
8885 | Diag(PrevDecl->getLocation(), diag::note_previous_definition); |
8886 | IsInvalid = true; |
8887 | // Continue on to push Namespc as current DeclContext and return it. |
8888 | } else if (II->isStr("std") && |
8889 | CurContext->getRedeclContext()->isTranslationUnit()) { |
8890 | // This is the first "real" definition of the namespace "std", so update |
8891 | // our cache of the "std" namespace to point at this definition. |
8892 | PrevNS = getStdNamespace(); |
8893 | IsStd = true; |
8894 | AddToKnown = !IsInline; |
8895 | } else { |
8896 | // We've seen this namespace for the first time. |
8897 | AddToKnown = !IsInline; |
8898 | } |
8899 | } else { |
8900 | // Anonymous namespaces. |
8901 | |
8902 | // Determine whether the parent already has an anonymous namespace. |
8903 | DeclContext *Parent = CurContext->getRedeclContext(); |
8904 | if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { |
8905 | PrevNS = TU->getAnonymousNamespace(); |
8906 | } else { |
8907 | NamespaceDecl *ND = cast<NamespaceDecl>(Parent); |
8908 | PrevNS = ND->getAnonymousNamespace(); |
8909 | } |
8910 | |
8911 | if (PrevNS && IsInline != PrevNS->isInline()) |
8912 | DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, |
8913 | &IsInline, PrevNS); |
8914 | } |
8915 | |
8916 | NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, |
8917 | StartLoc, Loc, II, PrevNS); |
8918 | if (IsInvalid) |
8919 | Namespc->setInvalidDecl(); |
8920 | |
8921 | ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); |
8922 | AddPragmaAttributes(DeclRegionScope, Namespc); |
8923 | |
8924 | // FIXME: Should we be merging attributes? |
8925 | if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) |
8926 | PushNamespaceVisibilityAttr(Attr, Loc); |
8927 | |
8928 | if (IsStd) |
8929 | StdNamespace = Namespc; |
8930 | if (AddToKnown) |
8931 | KnownNamespaces[Namespc] = false; |
8932 | |
8933 | if (II) { |
8934 | PushOnScopeChains(Namespc, DeclRegionScope); |
8935 | } else { |
8936 | // Link the anonymous namespace into its parent. |
8937 | DeclContext *Parent = CurContext->getRedeclContext(); |
8938 | if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { |
8939 | TU->setAnonymousNamespace(Namespc); |
8940 | } else { |
8941 | cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); |
8942 | } |
8943 | |
8944 | CurContext->addDecl(Namespc); |
8945 | |
8946 | // C++ [namespace.unnamed]p1. An unnamed-namespace-definition |
8947 | // behaves as if it were replaced by |
8948 | // namespace unique { /* empty body */ } |
8949 | // using namespace unique; |
8950 | // namespace unique { namespace-body } |
8951 | // where all occurrences of 'unique' in a translation unit are |
8952 | // replaced by the same identifier and this identifier differs |
8953 | // from all other identifiers in the entire program. |
8954 | |
8955 | // We just create the namespace with an empty name and then add an |
8956 | // implicit using declaration, just like the standard suggests. |
8957 | // |
8958 | // CodeGen enforces the "universally unique" aspect by giving all |
8959 | // declarations semantically contained within an anonymous |
8960 | // namespace internal linkage. |
8961 | |
8962 | if (!PrevNS) { |
8963 | UD = UsingDirectiveDecl::Create(Context, Parent, |
8964 | /* 'using' */ LBrace, |
8965 | /* 'namespace' */ SourceLocation(), |
8966 | /* qualifier */ NestedNameSpecifierLoc(), |
8967 | /* identifier */ SourceLocation(), |
8968 | Namespc, |
8969 | /* Ancestor */ Parent); |
8970 | UD->setImplicit(); |
8971 | Parent->addDecl(UD); |
8972 | } |
8973 | } |
8974 | |
8975 | ActOnDocumentableDecl(Namespc); |
8976 | |
8977 | // Although we could have an invalid decl (i.e. the namespace name is a |
8978 | // redefinition), push it as current DeclContext and try to continue parsing. |
8979 | // FIXME: We should be able to push Namespc here, so that the each DeclContext |
8980 | // for the namespace has the declarations that showed up in that particular |
8981 | // namespace definition. |
8982 | PushDeclContext(NamespcScope, Namespc); |
8983 | return Namespc; |
8984 | } |
8985 | |
8986 | /// getNamespaceDecl - Returns the namespace a decl represents. If the decl |
8987 | /// is a namespace alias, returns the namespace it points to. |
8988 | static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { |
8989 | if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) |
8990 | return AD->getNamespace(); |
8991 | return dyn_cast_or_null<NamespaceDecl>(D); |
8992 | } |
8993 | |
8994 | /// ActOnFinishNamespaceDef - This callback is called after a namespace is |
8995 | /// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. |
8996 | void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { |
8997 | NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); |
8998 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 8998, __PRETTY_FUNCTION__)); |
8999 | Namespc->setRBraceLoc(RBrace); |
9000 | PopDeclContext(); |
9001 | if (Namespc->hasAttr<VisibilityAttr>()) |
9002 | PopPragmaVisibility(true, RBrace); |
9003 | // If this namespace contains an export-declaration, export it now. |
9004 | if (DeferredExportedNamespaces.erase(Namespc)) |
9005 | Dcl->setModuleOwnershipKind(Decl::ModuleOwnershipKind::VisibleWhenImported); |
9006 | } |
9007 | |
9008 | CXXRecordDecl *Sema::getStdBadAlloc() const { |
9009 | return cast_or_null<CXXRecordDecl>( |
9010 | StdBadAlloc.get(Context.getExternalSource())); |
9011 | } |
9012 | |
9013 | EnumDecl *Sema::getStdAlignValT() const { |
9014 | return cast_or_null<EnumDecl>(StdAlignValT.get(Context.getExternalSource())); |
9015 | } |
9016 | |
9017 | NamespaceDecl *Sema::getStdNamespace() const { |
9018 | return cast_or_null<NamespaceDecl>( |
9019 | StdNamespace.get(Context.getExternalSource())); |
9020 | } |
9021 | |
9022 | NamespaceDecl *Sema::lookupStdExperimentalNamespace() { |
9023 | if (!StdExperimentalNamespaceCache) { |
9024 | if (auto Std = getStdNamespace()) { |
9025 | LookupResult Result(*this, &PP.getIdentifierTable().get("experimental"), |
9026 | SourceLocation(), LookupNamespaceName); |
9027 | if (!LookupQualifiedName(Result, Std) || |
9028 | !(StdExperimentalNamespaceCache = |
9029 | Result.getAsSingle<NamespaceDecl>())) |
9030 | Result.suppressDiagnostics(); |
9031 | } |
9032 | } |
9033 | return StdExperimentalNamespaceCache; |
9034 | } |
9035 | |
9036 | namespace { |
9037 | |
9038 | enum UnsupportedSTLSelect { |
9039 | USS_InvalidMember, |
9040 | USS_MissingMember, |
9041 | USS_NonTrivial, |
9042 | USS_Other |
9043 | }; |
9044 | |
9045 | struct InvalidSTLDiagnoser { |
9046 | Sema &S; |
9047 | SourceLocation Loc; |
9048 | QualType TyForDiags; |
9049 | |
9050 | QualType operator()(UnsupportedSTLSelect Sel = USS_Other, StringRef Name = "", |
9051 | const VarDecl *VD = nullptr) { |
9052 | { |
9053 | auto D = S.Diag(Loc, diag::err_std_compare_type_not_supported) |
9054 | << TyForDiags << ((int)Sel); |
9055 | if (Sel == USS_InvalidMember || Sel == USS_MissingMember) { |
9056 | assert(!Name.empty())((!Name.empty()) ? static_cast<void> (0) : __assert_fail ("!Name.empty()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 9056, __PRETTY_FUNCTION__)); |
9057 | D << Name; |
9058 | } |
9059 | } |
9060 | if (Sel == USS_InvalidMember) { |
9061 | S.Diag(VD->getLocation(), diag::note_var_declared_here) |
9062 | << VD << VD->getSourceRange(); |
9063 | } |
9064 | return QualType(); |
9065 | } |
9066 | }; |
9067 | } // namespace |
9068 | |
9069 | QualType Sema::CheckComparisonCategoryType(ComparisonCategoryType Kind, |
9070 | SourceLocation Loc) { |
9071 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 9072, __PRETTY_FUNCTION__)) |
9072 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 9072, __PRETTY_FUNCTION__)); |
9073 | |
9074 | // Check if we've already successfully checked the comparison category type |
9075 | // before. If so, skip checking it again. |
9076 | ComparisonCategoryInfo *Info = Context.CompCategories.lookupInfo(Kind); |
9077 | if (Info && FullyCheckedComparisonCategories[static_cast<unsigned>(Kind)]) |
9078 | return Info->getType(); |
9079 | |
9080 | // If lookup failed |
9081 | if (!Info) { |
9082 | std::string NameForDiags = "std::"; |
9083 | NameForDiags += ComparisonCategories::getCategoryString(Kind); |
9084 | Diag(Loc, diag::err_implied_comparison_category_type_not_found) |
9085 | << NameForDiags; |
9086 | return QualType(); |
9087 | } |
9088 | |
9089 | assert(Info->Kind == Kind)((Info->Kind == Kind) ? static_cast<void> (0) : __assert_fail ("Info->Kind == Kind", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 9089, __PRETTY_FUNCTION__)); |
9090 | assert(Info->Record)((Info->Record) ? static_cast<void> (0) : __assert_fail ("Info->Record", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 9090, __PRETTY_FUNCTION__)); |
9091 | |
9092 | // Update the Record decl in case we encountered a forward declaration on our |
9093 | // first pass. FIXME: This is a bit of a hack. |
9094 | if (Info->Record->hasDefinition()) |
9095 | Info->Record = Info->Record->getDefinition(); |
9096 | |
9097 | // Use an elaborated type for diagnostics which has a name containing the |
9098 | // prepended 'std' namespace but not any inline namespace names. |
9099 | QualType TyForDiags = [&]() { |
9100 | auto *NNS = |
9101 | NestedNameSpecifier::Create(Context, nullptr, getStdNamespace()); |
9102 | return Context.getElaboratedType(ETK_None, NNS, Info->getType()); |
9103 | }(); |
9104 | |
9105 | if (RequireCompleteType(Loc, TyForDiags, diag::err_incomplete_type)) |
9106 | return QualType(); |
9107 | |
9108 | InvalidSTLDiagnoser UnsupportedSTLError{*this, Loc, TyForDiags}; |
9109 | |
9110 | if (!Info->Record->isTriviallyCopyable()) |
9111 | return UnsupportedSTLError(USS_NonTrivial); |
9112 | |
9113 | for (const CXXBaseSpecifier &BaseSpec : Info->Record->bases()) { |
9114 | CXXRecordDecl *Base = BaseSpec.getType()->getAsCXXRecordDecl(); |
9115 | // Tolerate empty base classes. |
9116 | if (Base->isEmpty()) |
9117 | continue; |
9118 | // Reject STL implementations which have at least one non-empty base. |
9119 | return UnsupportedSTLError(); |
9120 | } |
9121 | |
9122 | // Check that the STL has implemented the types using a single integer field. |
9123 | // This expectation allows better codegen for builtin operators. We require: |
9124 | // (1) The class has exactly one field. |
9125 | // (2) The field is an integral or enumeration type. |
9126 | auto FIt = Info->Record->field_begin(), FEnd = Info->Record->field_end(); |
9127 | if (std::distance(FIt, FEnd) != 1 || |
9128 | !FIt->getType()->isIntegralOrEnumerationType()) { |
9129 | return UnsupportedSTLError(); |
9130 | } |
9131 | |
9132 | // Build each of the require values and store them in Info. |
9133 | for (ComparisonCategoryResult CCR : |
9134 | ComparisonCategories::getPossibleResultsForType(Kind)) { |
9135 | StringRef MemName = ComparisonCategories::getResultString(CCR); |
9136 | ComparisonCategoryInfo::ValueInfo *ValInfo = Info->lookupValueInfo(CCR); |
9137 | |
9138 | if (!ValInfo) |
9139 | return UnsupportedSTLError(USS_MissingMember, MemName); |
9140 | |
9141 | VarDecl *VD = ValInfo->VD; |
9142 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 9142, __PRETTY_FUNCTION__)); |
9143 | |
9144 | // Attempt to diagnose reasons why the STL definition of this type |
9145 | // might be foobar, including it failing to be a constant expression. |
9146 | // TODO Handle more ways the lookup or result can be invalid. |
9147 | if (!VD->isStaticDataMember() || !VD->isConstexpr() || !VD->hasInit() || |
9148 | !VD->checkInitIsICE()) |
9149 | return UnsupportedSTLError(USS_InvalidMember, MemName, VD); |
9150 | |
9151 | // Attempt to evaluate the var decl as a constant expression and extract |
9152 | // the value of its first field as a ICE. If this fails, the STL |
9153 | // implementation is not supported. |
9154 | if (!ValInfo->hasValidIntValue()) |
9155 | return UnsupportedSTLError(); |
9156 | |
9157 | MarkVariableReferenced(Loc, VD); |
9158 | } |
9159 | |
9160 | // We've successfully built the required types and expressions. Update |
9161 | // the cache and return the newly cached value. |
9162 | FullyCheckedComparisonCategories[static_cast<unsigned>(Kind)] = true; |
9163 | return Info->getType(); |
9164 | } |
9165 | |
9166 | /// Retrieve the special "std" namespace, which may require us to |
9167 | /// implicitly define the namespace. |
9168 | NamespaceDecl *Sema::getOrCreateStdNamespace() { |
9169 | if (!StdNamespace) { |
9170 | // The "std" namespace has not yet been defined, so build one implicitly. |
9171 | StdNamespace = NamespaceDecl::Create(Context, |
9172 | Context.getTranslationUnitDecl(), |
9173 | /*Inline=*/false, |
9174 | SourceLocation(), SourceLocation(), |
9175 | &PP.getIdentifierTable().get("std"), |
9176 | /*PrevDecl=*/nullptr); |
9177 | getStdNamespace()->setImplicit(true); |
9178 | } |
9179 | |
9180 | return getStdNamespace(); |
9181 | } |
9182 | |
9183 | bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { |
9184 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 9185, __PRETTY_FUNCTION__)) |
9185 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 9185, __PRETTY_FUNCTION__)); |
9186 | |
9187 | // We're looking for implicit instantiations of |
9188 | // template <typename E> class std::initializer_list. |
9189 | |
9190 | if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. |
9191 | return false; |
9192 | |
9193 | ClassTemplateDecl *Template = nullptr; |
9194 | const TemplateArgument *Arguments = nullptr; |
9195 | |
9196 | if (const RecordType *RT = Ty->getAs<RecordType>()) { |
9197 | |
9198 | ClassTemplateSpecializationDecl *Specialization = |
9199 | dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); |
9200 | if (!Specialization) |
9201 | return false; |
9202 | |
9203 | Template = Specialization->getSpecializedTemplate(); |
9204 | Arguments = Specialization->getTemplateArgs().data(); |
9205 | } else if (const TemplateSpecializationType *TST = |
9206 | Ty->getAs<TemplateSpecializationType>()) { |
9207 | Template = dyn_cast_or_null<ClassTemplateDecl>( |
9208 | TST->getTemplateName().getAsTemplateDecl()); |
9209 | Arguments = TST->getArgs(); |
9210 | } |
9211 | if (!Template) |
9212 | return false; |
9213 | |
9214 | if (!StdInitializerList) { |
9215 | // Haven't recognized std::initializer_list yet, maybe this is it. |
9216 | CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); |
9217 | if (TemplateClass->getIdentifier() != |
9218 | &PP.getIdentifierTable().get("initializer_list") || |
9219 | !getStdNamespace()->InEnclosingNamespaceSetOf( |
9220 | TemplateClass->getDeclContext())) |
9221 | return false; |
9222 | // This is a template called std::initializer_list, but is it the right |
9223 | // template? |
9224 | TemplateParameterList *Params = Template->getTemplateParameters(); |
9225 | if (Params->getMinRequiredArguments() != 1) |
9226 | return false; |
9227 | if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) |
9228 | return false; |
9229 | |
9230 | // It's the right template. |
9231 | StdInitializerList = Template; |
9232 | } |
9233 | |
9234 | if (Template->getCanonicalDecl() != StdInitializerList->getCanonicalDecl()) |
9235 | return false; |
9236 | |
9237 | // This is an instance of std::initializer_list. Find the argument type. |
9238 | if (Element) |
9239 | *Element = Arguments[0].getAsType(); |
9240 | return true; |
9241 | } |
9242 | |
9243 | static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ |
9244 | NamespaceDecl *Std = S.getStdNamespace(); |
9245 | if (!Std) { |
9246 | S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); |
9247 | return nullptr; |
9248 | } |
9249 | |
9250 | LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), |
9251 | Loc, Sema::LookupOrdinaryName); |
9252 | if (!S.LookupQualifiedName(Result, Std)) { |
9253 | S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); |
9254 | return nullptr; |
9255 | } |
9256 | ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); |
9257 | if (!Template) { |
9258 | Result.suppressDiagnostics(); |
9259 | // We found something weird. Complain about the first thing we found. |
9260 | NamedDecl *Found = *Result.begin(); |
9261 | S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); |
9262 | return nullptr; |
9263 | } |
9264 | |
9265 | // We found some template called std::initializer_list. Now verify that it's |
9266 | // correct. |
9267 | TemplateParameterList *Params = Template->getTemplateParameters(); |
9268 | if (Params->getMinRequiredArguments() != 1 || |
9269 | !isa<TemplateTypeParmDecl>(Params->getParam(0))) { |
9270 | S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); |
9271 | return nullptr; |
9272 | } |
9273 | |
9274 | return Template; |
9275 | } |
9276 | |
9277 | QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { |
9278 | if (!StdInitializerList) { |
9279 | StdInitializerList = LookupStdInitializerList(*this, Loc); |
9280 | if (!StdInitializerList) |
9281 | return QualType(); |
9282 | } |
9283 | |
9284 | TemplateArgumentListInfo Args(Loc, Loc); |
9285 | Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), |
9286 | Context.getTrivialTypeSourceInfo(Element, |
9287 | Loc))); |
9288 | return Context.getCanonicalType( |
9289 | CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); |
9290 | } |
9291 | |
9292 | bool Sema::isInitListConstructor(const FunctionDecl *Ctor) { |
9293 | // C++ [dcl.init.list]p2: |
9294 | // A constructor is an initializer-list constructor if its first parameter |
9295 | // is of type std::initializer_list<E> or reference to possibly cv-qualified |
9296 | // std::initializer_list<E> for some type E, and either there are no other |
9297 | // parameters or else all other parameters have default arguments. |
9298 | if (Ctor->getNumParams() < 1 || |
9299 | (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) |
9300 | return false; |
9301 | |
9302 | QualType ArgType = Ctor->getParamDecl(0)->getType(); |
9303 | if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) |
9304 | ArgType = RT->getPointeeType().getUnqualifiedType(); |
9305 | |
9306 | return isStdInitializerList(ArgType, nullptr); |
9307 | } |
9308 | |
9309 | /// Determine whether a using statement is in a context where it will be |
9310 | /// apply in all contexts. |
9311 | static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { |
9312 | switch (CurContext->getDeclKind()) { |
9313 | case Decl::TranslationUnit: |
9314 | return true; |
9315 | case Decl::LinkageSpec: |
9316 | return IsUsingDirectiveInToplevelContext(CurContext->getParent()); |
9317 | default: |
9318 | return false; |
9319 | } |
9320 | } |
9321 | |
9322 | namespace { |
9323 | |
9324 | // Callback to only accept typo corrections that are namespaces. |
9325 | class NamespaceValidatorCCC final : public CorrectionCandidateCallback { |
9326 | public: |
9327 | bool ValidateCandidate(const TypoCorrection &candidate) override { |
9328 | if (NamedDecl *ND = candidate.getCorrectionDecl()) |
9329 | return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); |
9330 | return false; |
9331 | } |
9332 | |
9333 | std::unique_ptr<CorrectionCandidateCallback> clone() override { |
9334 | return llvm::make_unique<NamespaceValidatorCCC>(*this); |
9335 | } |
9336 | }; |
9337 | |
9338 | } |
9339 | |
9340 | static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, |
9341 | CXXScopeSpec &SS, |
9342 | SourceLocation IdentLoc, |
9343 | IdentifierInfo *Ident) { |
9344 | R.clear(); |
9345 | NamespaceValidatorCCC CCC{}; |
9346 | if (TypoCorrection Corrected = |
9347 | S.CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), Sc, &SS, CCC, |
9348 | Sema::CTK_ErrorRecovery)) { |
9349 | if (DeclContext *DC = S.computeDeclContext(SS, false)) { |
9350 | std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); |
9351 | bool DroppedSpecifier = Corrected.WillReplaceSpecifier() && |
9352 | Ident->getName().equals(CorrectedStr); |
9353 | S.diagnoseTypo(Corrected, |
9354 | S.PDiag(diag::err_using_directive_member_suggest) |
9355 | << Ident << DC << DroppedSpecifier << SS.getRange(), |
9356 | S.PDiag(diag::note_namespace_defined_here)); |
9357 | } else { |
9358 | S.diagnoseTypo(Corrected, |
9359 | S.PDiag(diag::err_using_directive_suggest) << Ident, |
9360 | S.PDiag(diag::note_namespace_defined_here)); |
9361 | } |
9362 | R.addDecl(Corrected.getFoundDecl()); |
9363 | return true; |
9364 | } |
9365 | return false; |
9366 | } |
9367 | |
9368 | Decl *Sema::ActOnUsingDirective(Scope *S, SourceLocation UsingLoc, |
9369 | SourceLocation NamespcLoc, CXXScopeSpec &SS, |
9370 | SourceLocation IdentLoc, |
9371 | IdentifierInfo *NamespcName, |
9372 | const ParsedAttributesView &AttrList) { |
9373 | assert(!SS.isInvalid() && "Invalid CXXScopeSpec.")((!SS.isInvalid() && "Invalid CXXScopeSpec.") ? static_cast <void> (0) : __assert_fail ("!SS.isInvalid() && \"Invalid CXXScopeSpec.\"" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 9373, __PRETTY_FUNCTION__)); |
9374 | assert(NamespcName && "Invalid NamespcName.")((NamespcName && "Invalid NamespcName.") ? static_cast <void> (0) : __assert_fail ("NamespcName && \"Invalid NamespcName.\"" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 9374, __PRETTY_FUNCTION__)); |
9375 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 9375, __PRETTY_FUNCTION__)); |
9376 | |
9377 | // This can only happen along a recovery path. |
9378 | while (S->isTemplateParamScope()) |
9379 | S = S->getParent(); |
9380 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 9380, __PRETTY_FUNCTION__)); |
9381 | |
9382 | UsingDirectiveDecl *UDir = nullptr; |
9383 | NestedNameSpecifier *Qualifier = nullptr; |
9384 | if (SS.isSet()) |
9385 | Qualifier = SS.getScopeRep(); |
9386 | |
9387 | // Lookup namespace name. |
9388 | LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); |
9389 | LookupParsedName(R, S, &SS); |
9390 | if (R.isAmbiguous()) |
9391 | return nullptr; |
9392 | |
9393 | if (R.empty()) { |
9394 | R.clear(); |
9395 | // Allow "using namespace std;" or "using namespace ::std;" even if |
9396 | // "std" hasn't been defined yet, for GCC compatibility. |
9397 | if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && |
9398 | NamespcName->isStr("std")) { |
9399 | Diag(IdentLoc, diag::ext_using_undefined_std); |
9400 | R.addDecl(getOrCreateStdNamespace()); |
9401 | R.resolveKind(); |
9402 | } |
9403 | // Otherwise, attempt typo correction. |
9404 | else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); |
9405 | } |
9406 | |
9407 | if (!R.empty()) { |
9408 | NamedDecl *Named = R.getRepresentativeDecl(); |
9409 | NamespaceDecl *NS = R.getAsSingle<NamespaceDecl>(); |
9410 | assert(NS && "expected namespace decl")((NS && "expected namespace decl") ? static_cast<void > (0) : __assert_fail ("NS && \"expected namespace decl\"" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 9410, __PRETTY_FUNCTION__)); |
9411 | |
9412 | // The use of a nested name specifier may trigger deprecation warnings. |
9413 | DiagnoseUseOfDecl(Named, IdentLoc); |
9414 | |
9415 | // C++ [namespace.udir]p1: |
9416 | // A using-directive specifies that the names in the nominated |
9417 | // namespace can be used in the scope in which the |
9418 | // using-directive appears after the using-directive. During |
9419 | // unqualified name lookup (3.4.1), the names appear as if they |
9420 | // were declared in the nearest enclosing namespace which |
9421 | // contains both the using-directive and the nominated |
9422 | // namespace. [Note: in this context, "contains" means "contains |
9423 | // directly or indirectly". ] |
9424 | |
9425 | // Find enclosing context containing both using-directive and |
9426 | // nominated namespace. |
9427 | DeclContext *CommonAncestor = NS; |
9428 | while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) |
9429 | CommonAncestor = CommonAncestor->getParent(); |
9430 | |
9431 | UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, |
9432 | SS.getWithLocInContext(Context), |
9433 | IdentLoc, Named, CommonAncestor); |
9434 | |
9435 | if (IsUsingDirectiveInToplevelContext(CurContext) && |
9436 | !SourceMgr.isInMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { |
9437 | Diag(IdentLoc, diag::warn_using_directive_in_header); |
9438 | } |
9439 | |
9440 | PushUsingDirective(S, UDir); |
9441 | } else { |
9442 | Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); |
9443 | } |
9444 | |
9445 | if (UDir) |
9446 | ProcessDeclAttributeList(S, UDir, AttrList); |
9447 | |
9448 | return UDir; |
9449 | } |
9450 | |
9451 | void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { |
9452 | // If the scope has an associated entity and the using directive is at |
9453 | // namespace or translation unit scope, add the UsingDirectiveDecl into |
9454 | // its lookup structure so qualified name lookup can find it. |
9455 | DeclContext *Ctx = S->getEntity(); |
9456 | if (Ctx && !Ctx->isFunctionOrMethod()) |
9457 | Ctx->addDecl(UDir); |
9458 | else |
9459 | // Otherwise, it is at block scope. The using-directives will affect lookup |
9460 | // only to the end of the scope. |
9461 | S->PushUsingDirective(UDir); |
9462 | } |
9463 | |
9464 | Decl *Sema::ActOnUsingDeclaration(Scope *S, AccessSpecifier AS, |
9465 | SourceLocation UsingLoc, |
9466 | SourceLocation TypenameLoc, CXXScopeSpec &SS, |
9467 | UnqualifiedId &Name, |
9468 | SourceLocation EllipsisLoc, |
9469 | const ParsedAttributesView &AttrList) { |
9470 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 9470, __PRETTY_FUNCTION__)); |
9471 | |
9472 | if (SS.isEmpty()) { |
9473 | Diag(Name.getBeginLoc(), diag::err_using_requires_qualname); |
9474 | return nullptr; |
9475 | } |
9476 | |
9477 | switch (Name.getKind()) { |
9478 | case UnqualifiedIdKind::IK_ImplicitSelfParam: |
9479 | case UnqualifiedIdKind::IK_Identifier: |
9480 | case UnqualifiedIdKind::IK_OperatorFunctionId: |
9481 | case UnqualifiedIdKind::IK_LiteralOperatorId: |
9482 | case UnqualifiedIdKind::IK_ConversionFunctionId: |
9483 | break; |
9484 | |
9485 | case UnqualifiedIdKind::IK_ConstructorName: |
9486 | case UnqualifiedIdKind::IK_ConstructorTemplateId: |
9487 | // C++11 inheriting constructors. |
9488 | Diag(Name.getBeginLoc(), |
9489 | getLangOpts().CPlusPlus11 |
9490 | ? diag::warn_cxx98_compat_using_decl_constructor |
9491 | : diag::err_using_decl_constructor) |
9492 | << SS.getRange(); |
9493 | |
9494 | if (getLangOpts().CPlusPlus11) break; |
9495 | |
9496 | return nullptr; |
9497 | |
9498 | case UnqualifiedIdKind::IK_DestructorName: |
9499 | Diag(Name.getBeginLoc(), diag::err_using_decl_destructor) << SS.getRange(); |
9500 | return nullptr; |
9501 | |
9502 | case UnqualifiedIdKind::IK_TemplateId: |
9503 | Diag(Name.getBeginLoc(), diag::err_using_decl_template_id) |
9504 | << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); |
9505 | return nullptr; |
9506 | |
9507 | case UnqualifiedIdKind::IK_DeductionGuideName: |
9508 | llvm_unreachable("cannot parse qualified deduction guide name")::llvm::llvm_unreachable_internal("cannot parse qualified deduction guide name" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 9508); |
9509 | } |
9510 | |
9511 | DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); |
9512 | DeclarationName TargetName = TargetNameInfo.getName(); |
9513 | if (!TargetName) |
9514 | return nullptr; |
9515 | |
9516 | // Warn about access declarations. |
9517 | if (UsingLoc.isInvalid()) { |
9518 | Diag(Name.getBeginLoc(), getLangOpts().CPlusPlus11 |
9519 | ? diag::err_access_decl |
9520 | : diag::warn_access_decl_deprecated) |
9521 | << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); |
9522 | } |
9523 | |
9524 | if (EllipsisLoc.isInvalid()) { |
9525 | if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || |
9526 | DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) |
9527 | return nullptr; |
9528 | } else { |
9529 | if (!SS.getScopeRep()->containsUnexpandedParameterPack() && |
9530 | !TargetNameInfo.containsUnexpandedParameterPack()) { |
9531 | Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) |
9532 | << SourceRange(SS.getBeginLoc(), TargetNameInfo.getEndLoc()); |
9533 | EllipsisLoc = SourceLocation(); |
9534 | } |
9535 | } |
9536 | |
9537 | NamedDecl *UD = |
9538 | BuildUsingDeclaration(S, AS, UsingLoc, TypenameLoc.isValid(), TypenameLoc, |
9539 | SS, TargetNameInfo, EllipsisLoc, AttrList, |
9540 | /*IsInstantiation*/false); |
9541 | if (UD) |
9542 | PushOnScopeChains(UD, S, /*AddToContext*/ false); |
9543 | |
9544 | return UD; |
9545 | } |
9546 | |
9547 | /// Determine whether a using declaration considers the given |
9548 | /// declarations as "equivalent", e.g., if they are redeclarations of |
9549 | /// the same entity or are both typedefs of the same type. |
9550 | static bool |
9551 | IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2) { |
9552 | if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) |
9553 | return true; |
9554 | |
9555 | if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) |
9556 | if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) |
9557 | return Context.hasSameType(TD1->getUnderlyingType(), |
9558 | TD2->getUnderlyingType()); |
9559 | |
9560 | return false; |
9561 | } |
9562 | |
9563 | |
9564 | /// Determines whether to create a using shadow decl for a particular |
9565 | /// decl, given the set of decls existing prior to this using lookup. |
9566 | bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, |
9567 | const LookupResult &Previous, |
9568 | UsingShadowDecl *&PrevShadow) { |
9569 | // Diagnose finding a decl which is not from a base class of the |
9570 | // current class. We do this now because there are cases where this |
9571 | // function will silently decide not to build a shadow decl, which |
9572 | // will pre-empt further diagnostics. |
9573 | // |
9574 | // We don't need to do this in C++11 because we do the check once on |
9575 | // the qualifier. |
9576 | // |
9577 | // FIXME: diagnose the following if we care enough: |
9578 | // struct A { int foo; }; |
9579 | // struct B : A { using A::foo; }; |
9580 | // template <class T> struct C : A {}; |
9581 | // template <class T> struct D : C<T> { using B::foo; } // <--- |
9582 | // This is invalid (during instantiation) in C++03 because B::foo |
9583 | // resolves to the using decl in B, which is not a base class of D<T>. |
9584 | // We can't diagnose it immediately because C<T> is an unknown |
9585 | // specialization. The UsingShadowDecl in D<T> then points directly |
9586 | // to A::foo, which will look well-formed when we instantiate. |
9587 | // The right solution is to not collapse the shadow-decl chain. |
9588 | if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) { |
9589 | DeclContext *OrigDC = Orig->getDeclContext(); |
9590 | |
9591 | // Handle enums and anonymous structs. |
9592 | if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); |
9593 | CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); |
9594 | while (OrigRec->isAnonymousStructOrUnion()) |
9595 | OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); |
9596 | |
9597 | if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { |
9598 | if (OrigDC == CurContext) { |
9599 | Diag(Using->getLocation(), |
9600 | diag::err_using_decl_nested_name_specifier_is_current_class) |
9601 | << Using->getQualifierLoc().getSourceRange(); |
9602 | Diag(Orig->getLocation(), diag::note_using_decl_target); |
9603 | Using->setInvalidDecl(); |
9604 | return true; |
9605 | } |
9606 | |
9607 | Diag(Using->getQualifierLoc().getBeginLoc(), |
9608 | diag::err_using_decl_nested_name_specifier_is_not_base_class) |
9609 | << Using->getQualifier() |
9610 | << cast<CXXRecordDecl>(CurContext) |
9611 | << Using->getQualifierLoc().getSourceRange(); |
9612 | Diag(Orig->getLocation(), diag::note_using_decl_target); |
9613 | Using->setInvalidDecl(); |
9614 | return true; |
9615 | } |
9616 | } |
9617 | |
9618 | if (Previous.empty()) return false; |
9619 | |
9620 | NamedDecl *Target = Orig; |
9621 | if (isa<UsingShadowDecl>(Target)) |
9622 | Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); |
9623 | |
9624 | // If the target happens to be one of the previous declarations, we |
9625 | // don't have a conflict. |
9626 | // |
9627 | // FIXME: but we might be increasing its access, in which case we |
9628 | // should redeclare it. |
9629 | NamedDecl *NonTag = nullptr, *Tag = nullptr; |
9630 | bool FoundEquivalentDecl = false; |
9631 | for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); |
9632 | I != E; ++I) { |
9633 | NamedDecl *D = (*I)->getUnderlyingDecl(); |
9634 | // We can have UsingDecls in our Previous results because we use the same |
9635 | // LookupResult for checking whether the UsingDecl itself is a valid |
9636 | // redeclaration. |
9637 | if (isa<UsingDecl>(D) || isa<UsingPackDecl>(D)) |
9638 | continue; |
9639 | |
9640 | if (auto *RD = dyn_cast<CXXRecordDecl>(D)) { |
9641 | // C++ [class.mem]p19: |
9642 | // If T is the name of a class, then [every named member other than |
9643 | // a non-static data member] shall have a name different from T |
9644 | if (RD->isInjectedClassName() && !isa<FieldDecl>(Target) && |
9645 | !isa<IndirectFieldDecl>(Target) && |
9646 | !isa<UnresolvedUsingValueDecl>(Target) && |
9647 | DiagnoseClassNameShadow( |
9648 | CurContext, |
9649 | DeclarationNameInfo(Using->getDeclName(), Using->getLocation()))) |
9650 | return true; |
9651 | } |
9652 | |
9653 | if (IsEquivalentForUsingDecl(Context, D, Target)) { |
9654 | if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(*I)) |
9655 | PrevShadow = Shadow; |
9656 | FoundEquivalentDecl = true; |
9657 | } else if (isEquivalentInternalLinkageDeclaration(D, Target)) { |
9658 | // We don't conflict with an existing using shadow decl of an equivalent |
9659 | // declaration, but we're not a redeclaration of it. |
9660 | FoundEquivalentDecl = true; |
9661 | } |
9662 | |
9663 | if (isVisible(D)) |
9664 | (isa<TagDecl>(D) ? Tag : NonTag) = D; |
9665 | } |
9666 | |
9667 | if (FoundEquivalentDecl) |
9668 | return false; |
9669 | |
9670 | if (FunctionDecl *FD = Target->getAsFunction()) { |
9671 | NamedDecl *OldDecl = nullptr; |
9672 | switch (CheckOverload(nullptr, FD, Previous, OldDecl, |
9673 | /*IsForUsingDecl*/ true)) { |
9674 | case Ovl_Overload: |
9675 | return false; |
9676 | |
9677 | case Ovl_NonFunction: |
9678 | Diag(Using->getLocation(), diag::err_using_decl_conflict); |
9679 | break; |
9680 | |
9681 | // We found a decl with the exact signature. |
9682 | case Ovl_Match: |
9683 | // If we're in a record, we want to hide the target, so we |
9684 | // return true (without a diagnostic) to tell the caller not to |
9685 | // build a shadow decl. |
9686 | if (CurContext->isRecord()) |
9687 | return true; |
9688 | |
9689 | // If we're not in a record, this is an error. |
9690 | Diag(Using->getLocation(), diag::err_using_decl_conflict); |
9691 | break; |
9692 | } |
9693 | |
9694 | Diag(Target->getLocation(), diag::note_using_decl_target); |
9695 | Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); |
9696 | Using->setInvalidDecl(); |
9697 | return true; |
9698 | } |
9699 | |
9700 | // Target is not a function. |
9701 | |
9702 | if (isa<TagDecl>(Target)) { |
9703 | // No conflict between a tag and a non-tag. |
9704 | if (!Tag) return false; |
9705 | |
9706 | Diag(Using->getLocation(), diag::err_using_decl_conflict); |
9707 | Diag(Target->getLocation(), diag::note_using_decl_target); |
9708 | Diag(Tag->getLocation(), diag::note_using_decl_conflict); |
9709 | Using->setInvalidDecl(); |
9710 | return true; |
9711 | } |
9712 | |
9713 | // No conflict between a tag and a non-tag. |
9714 | if (!NonTag) return false; |
9715 | |
9716 | Diag(Using->getLocation(), diag::err_using_decl_conflict); |
9717 | Diag(Target->getLocation(), diag::note_using_decl_target); |
9718 | Diag(NonTag->getLocation(), diag::note_using_decl_conflict); |
9719 | Using->setInvalidDecl(); |
9720 | return true; |
9721 | } |
9722 | |
9723 | /// Determine whether a direct base class is a virtual base class. |
9724 | static bool isVirtualDirectBase(CXXRecordDecl *Derived, CXXRecordDecl *Base) { |
9725 | if (!Derived->getNumVBases()) |
9726 | return false; |
9727 | for (auto &B : Derived->bases()) |
9728 | if (B.getType()->getAsCXXRecordDecl() == Base) |
9729 | return B.isVirtual(); |
9730 | llvm_unreachable("not a direct base class")::llvm::llvm_unreachable_internal("not a direct base class", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 9730); |
9731 | } |
9732 | |
9733 | /// Builds a shadow declaration corresponding to a 'using' declaration. |
9734 | UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, |
9735 | UsingDecl *UD, |
9736 | NamedDecl *Orig, |
9737 | UsingShadowDecl *PrevDecl) { |
9738 | // If we resolved to another shadow declaration, just coalesce them. |
9739 | NamedDecl *Target = Orig; |
9740 | if (isa<UsingShadowDecl>(Target)) { |
9741 | Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); |
9742 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 9742, __PRETTY_FUNCTION__)); |
9743 | } |
9744 | |
9745 | NamedDecl *NonTemplateTarget = Target; |
9746 | if (auto *TargetTD = dyn_cast<TemplateDecl>(Target)) |
9747 | NonTemplateTarget = TargetTD->getTemplatedDecl(); |
9748 | |
9749 | UsingShadowDecl *Shadow; |
9750 | if (isa<CXXConstructorDecl>(NonTemplateTarget)) { |
9751 | bool IsVirtualBase = |
9752 | isVirtualDirectBase(cast<CXXRecordDecl>(CurContext), |
9753 | UD->getQualifier()->getAsRecordDecl()); |
9754 | Shadow = ConstructorUsingShadowDecl::Create( |
9755 | Context, CurContext, UD->getLocation(), UD, Orig, IsVirtualBase); |
9756 | } else { |
9757 | Shadow = UsingShadowDecl::Create(Context, CurContext, UD->getLocation(), UD, |
9758 | Target); |
9759 | } |
9760 | UD->addShadowDecl(Shadow); |
9761 | |
9762 | Shadow->setAccess(UD->getAccess()); |
9763 | if (Orig->isInvalidDecl() || UD->isInvalidDecl()) |
9764 | Shadow->setInvalidDecl(); |
9765 | |
9766 | Shadow->setPreviousDecl(PrevDecl); |
9767 | |
9768 | if (S) |
9769 | PushOnScopeChains(Shadow, S); |
9770 | else |
9771 | CurContext->addDecl(Shadow); |
9772 | |
9773 | |
9774 | return Shadow; |
9775 | } |
9776 | |
9777 | /// Hides a using shadow declaration. This is required by the current |
9778 | /// using-decl implementation when a resolvable using declaration in a |
9779 | /// class is followed by a declaration which would hide or override |
9780 | /// one or more of the using decl's targets; for example: |
9781 | /// |
9782 | /// struct Base { void foo(int); }; |
9783 | /// struct Derived : Base { |
9784 | /// using Base::foo; |
9785 | /// void foo(int); |
9786 | /// }; |
9787 | /// |
9788 | /// The governing language is C++03 [namespace.udecl]p12: |
9789 | /// |
9790 | /// When a using-declaration brings names from a base class into a |
9791 | /// derived class scope, member functions in the derived class |
9792 | /// override and/or hide member functions with the same name and |
9793 | /// parameter types in a base class (rather than conflicting). |
9794 | /// |
9795 | /// There are two ways to implement this: |
9796 | /// (1) optimistically create shadow decls when they're not hidden |
9797 | /// by existing declarations, or |
9798 | /// (2) don't create any shadow decls (or at least don't make them |
9799 | /// visible) until we've fully parsed/instantiated the class. |
9800 | /// The problem with (1) is that we might have to retroactively remove |
9801 | /// a shadow decl, which requires several O(n) operations because the |
9802 | /// decl structures are (very reasonably) not designed for removal. |
9803 | /// (2) avoids this but is very fiddly and phase-dependent. |
9804 | void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { |
9805 | if (Shadow->getDeclName().getNameKind() == |
9806 | DeclarationName::CXXConversionFunctionName) |
9807 | cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); |
9808 | |
9809 | // Remove it from the DeclContext... |
9810 | Shadow->getDeclContext()->removeDecl(Shadow); |
9811 | |
9812 | // ...and the scope, if applicable... |
9813 | if (S) { |
9814 | S->RemoveDecl(Shadow); |
9815 | IdResolver.RemoveDecl(Shadow); |
9816 | } |
9817 | |
9818 | // ...and the using decl. |
9819 | Shadow->getUsingDecl()->removeShadowDecl(Shadow); |
9820 | |
9821 | // TODO: complain somehow if Shadow was used. It shouldn't |
9822 | // be possible for this to happen, because...? |
9823 | } |
9824 | |
9825 | /// Find the base specifier for a base class with the given type. |
9826 | static CXXBaseSpecifier *findDirectBaseWithType(CXXRecordDecl *Derived, |
9827 | QualType DesiredBase, |
9828 | bool &AnyDependentBases) { |
9829 | // Check whether the named type is a direct base class. |
9830 | CanQualType CanonicalDesiredBase = DesiredBase->getCanonicalTypeUnqualified(); |
9831 | for (auto &Base : Derived->bases()) { |
9832 | CanQualType BaseType = Base.getType()->getCanonicalTypeUnqualified(); |
9833 | if (CanonicalDesiredBase == BaseType) |
9834 | return &Base; |
9835 | if (BaseType->isDependentType()) |
9836 | AnyDependentBases = true; |
9837 | } |
9838 | return nullptr; |
9839 | } |
9840 | |
9841 | namespace { |
9842 | class UsingValidatorCCC final : public CorrectionCandidateCallback { |
9843 | public: |
9844 | UsingValidatorCCC(bool HasTypenameKeyword, bool IsInstantiation, |
9845 | NestedNameSpecifier *NNS, CXXRecordDecl *RequireMemberOf) |
9846 | : HasTypenameKeyword(HasTypenameKeyword), |
9847 | IsInstantiation(IsInstantiation), OldNNS(NNS), |
9848 | RequireMemberOf(RequireMemberOf) {} |
9849 | |
9850 | bool ValidateCandidate(const TypoCorrection &Candidate) override { |
9851 | NamedDecl *ND = Candidate.getCorrectionDecl(); |
9852 | |
9853 | // Keywords are not valid here. |
9854 | if (!ND || isa<NamespaceDecl>(ND)) |
9855 | return false; |
9856 | |
9857 | // Completely unqualified names are invalid for a 'using' declaration. |
9858 | if (Candidate.WillReplaceSpecifier() && !Candidate.getCorrectionSpecifier()) |
9859 | return false; |
9860 | |
9861 | // FIXME: Don't correct to a name that CheckUsingDeclRedeclaration would |
9862 | // reject. |
9863 | |
9864 | if (RequireMemberOf) { |
9865 | auto *FoundRecord = dyn_cast<CXXRecordDecl>(ND); |
9866 | if (FoundRecord && FoundRecord->isInjectedClassName()) { |
9867 | // No-one ever wants a using-declaration to name an injected-class-name |
9868 | // of a base class, unless they're declaring an inheriting constructor. |
9869 | ASTContext &Ctx = ND->getASTContext(); |
9870 | if (!Ctx.getLangOpts().CPlusPlus11) |
9871 | return false; |
9872 | QualType FoundType = Ctx.getRecordType(FoundRecord); |
9873 | |
9874 | // Check that the injected-class-name is named as a member of its own |
9875 | // type; we don't want to suggest 'using Derived::Base;', since that |
9876 | // means something else. |
9877 | NestedNameSpecifier *Specifier = |
9878 | Candidate.WillReplaceSpecifier() |
9879 | ? Candidate.getCorrectionSpecifier() |
9880 | : OldNNS; |
9881 | if (!Specifier->getAsType() || |
9882 | !Ctx.hasSameType(QualType(Specifier->getAsType(), 0), FoundType)) |
9883 | return false; |
9884 | |
9885 | // Check that this inheriting constructor declaration actually names a |
9886 | // direct base class of the current class. |
9887 | bool AnyDependentBases = false; |
9888 | if (!findDirectBaseWithType(RequireMemberOf, |
9889 | Ctx.getRecordType(FoundRecord), |
9890 | AnyDependentBases) && |
9891 | !AnyDependentBases) |
9892 | return false; |
9893 | } else { |
9894 | auto *RD = dyn_cast<CXXRecordDecl>(ND->getDeclContext()); |
9895 | if (!RD || RequireMemberOf->isProvablyNotDerivedFrom(RD)) |
9896 | return false; |
9897 | |
9898 | // FIXME: Check that the base class member is accessible? |
9899 | } |
9900 | } else { |
9901 | auto *FoundRecord = dyn_cast<CXXRecordDecl>(ND); |
9902 | if (FoundRecord && FoundRecord->isInjectedClassName()) |
9903 | return false; |
9904 | } |
9905 | |
9906 | if (isa<TypeDecl>(ND)) |
9907 | return HasTypenameKeyword || !IsInstantiation; |
9908 | |
9909 | return !HasTypenameKeyword; |
9910 | } |
9911 | |
9912 | std::unique_ptr<CorrectionCandidateCallback> clone() override { |
9913 | return llvm::make_unique<UsingValidatorCCC>(*this); |
9914 | } |
9915 | |
9916 | private: |
9917 | bool HasTypenameKeyword; |
9918 | bool IsInstantiation; |
9919 | NestedNameSpecifier *OldNNS; |
9920 | CXXRecordDecl *RequireMemberOf; |
9921 | }; |
9922 | } // end anonymous namespace |
9923 | |
9924 | /// Builds a using declaration. |
9925 | /// |
9926 | /// \param IsInstantiation - Whether this call arises from an |
9927 | /// instantiation of an unresolved using declaration. We treat |
9928 | /// the lookup differently for these declarations. |
9929 | NamedDecl *Sema::BuildUsingDeclaration( |
9930 | Scope *S, AccessSpecifier AS, SourceLocation UsingLoc, |
9931 | bool HasTypenameKeyword, SourceLocation TypenameLoc, CXXScopeSpec &SS, |
9932 | DeclarationNameInfo NameInfo, SourceLocation EllipsisLoc, |
9933 | const ParsedAttributesView &AttrList, bool IsInstantiation) { |
9934 | assert(!SS.isInvalid() && "Invalid CXXScopeSpec.")((!SS.isInvalid() && "Invalid CXXScopeSpec.") ? static_cast <void> (0) : __assert_fail ("!SS.isInvalid() && \"Invalid CXXScopeSpec.\"" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 9934, __PRETTY_FUNCTION__)); |
9935 | SourceLocation IdentLoc = NameInfo.getLoc(); |
9936 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 9936, __PRETTY_FUNCTION__)); |
9937 | |
9938 | // FIXME: We ignore attributes for now. |
9939 | |
9940 | // For an inheriting constructor declaration, the name of the using |
9941 | // declaration is the name of a constructor in this class, not in the |
9942 | // base class. |
9943 | DeclarationNameInfo UsingName = NameInfo; |
9944 | if (UsingName.getName().getNameKind() == DeclarationName::CXXConstructorName) |
9945 | if (auto *RD = dyn_cast<CXXRecordDecl>(CurContext)) |
9946 | UsingName.setName(Context.DeclarationNames.getCXXConstructorName( |
9947 | Context.getCanonicalType(Context.getRecordType(RD)))); |
9948 | |
9949 | // Do the redeclaration lookup in the current scope. |
9950 | LookupResult Previous(*this, UsingName, LookupUsingDeclName, |
9951 | ForVisibleRedeclaration); |
9952 | Previous.setHideTags(false); |
9953 | if (S) { |
9954 | LookupName(Previous, S); |
9955 | |
9956 | // It is really dumb that we have to do this. |
9957 | LookupResult::Filter F = Previous.makeFilter(); |
9958 | while (F.hasNext()) { |
9959 | NamedDecl *D = F.next(); |
9960 | if (!isDeclInScope(D, CurContext, S)) |
9961 | F.erase(); |
9962 | // If we found a local extern declaration that's not ordinarily visible, |
9963 | // and this declaration is being added to a non-block scope, ignore it. |
9964 | // We're only checking for scope conflicts here, not also for violations |
9965 | // of the linkage rules. |
9966 | else if (!CurContext->isFunctionOrMethod() && D->isLocalExternDecl() && |
9967 | !(D->getIdentifierNamespace() & Decl::IDNS_Ordinary)) |
9968 | F.erase(); |
9969 | } |
9970 | F.done(); |
9971 | } else { |
9972 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 9972, __PRETTY_FUNCTION__)); |
9973 | if (CurContext->isRecord()) |
9974 | LookupQualifiedName(Previous, CurContext); |
9975 | else { |
9976 | // No redeclaration check is needed here; in non-member contexts we |
9977 | // diagnosed all possible conflicts with other using-declarations when |
9978 | // building the template: |
9979 | // |
9980 | // For a dependent non-type using declaration, the only valid case is |
9981 | // if we instantiate to a single enumerator. We check for conflicts |
9982 | // between shadow declarations we introduce, and we check in the template |
9983 | // definition for conflicts between a non-type using declaration and any |
9984 | // other declaration, which together covers all cases. |
9985 | // |
9986 | // A dependent typename using declaration will never successfully |
9987 | // instantiate, since it will always name a class member, so we reject |
9988 | // that in the template definition. |
9989 | } |
9990 | } |
9991 | |
9992 | // Check for invalid redeclarations. |
9993 | if (CheckUsingDeclRedeclaration(UsingLoc, HasTypenameKeyword, |
9994 | SS, IdentLoc, Previous)) |
9995 | return nullptr; |
9996 | |
9997 | // Check for bad qualifiers. |
9998 | if (CheckUsingDeclQualifier(UsingLoc, HasTypenameKeyword, SS, NameInfo, |
9999 | IdentLoc)) |
10000 | return nullptr; |
10001 | |
10002 | DeclContext *LookupContext = computeDeclContext(SS); |
10003 | NamedDecl *D; |
10004 | NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); |
10005 | if (!LookupContext || EllipsisLoc.isValid()) { |
10006 | if (HasTypenameKeyword) { |
10007 | // FIXME: not all declaration name kinds are legal here |
10008 | D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, |
10009 | UsingLoc, TypenameLoc, |
10010 | QualifierLoc, |
10011 | IdentLoc, NameInfo.getName(), |
10012 | EllipsisLoc); |
10013 | } else { |
10014 | D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, |
10015 | QualifierLoc, NameInfo, EllipsisLoc); |
10016 | } |
10017 | D->setAccess(AS); |
10018 | CurContext->addDecl(D); |
10019 | return D; |
10020 | } |
10021 | |
10022 | auto Build = [&](bool Invalid) { |
10023 | UsingDecl *UD = |
10024 | UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, |
10025 | UsingName, HasTypenameKeyword); |
10026 | UD->setAccess(AS); |
10027 | CurContext->addDecl(UD); |
10028 | UD->setInvalidDecl(Invalid); |
10029 | return UD; |
10030 | }; |
10031 | auto BuildInvalid = [&]{ return Build(true); }; |
10032 | auto BuildValid = [&]{ return Build(false); }; |
10033 | |
10034 | if (RequireCompleteDeclContext(SS, LookupContext)) |
10035 | return BuildInvalid(); |
10036 | |
10037 | // Look up the target name. |
10038 | LookupResult R(*this, NameInfo, LookupOrdinaryName); |
10039 | |
10040 | // Unlike most lookups, we don't always want to hide tag |
10041 | // declarations: tag names are visible through the using declaration |
10042 | // even if hidden by ordinary names, *except* in a dependent context |
10043 | // where it's important for the sanity of two-phase lookup. |
10044 | if (!IsInstantiation) |
10045 | R.setHideTags(false); |
10046 | |
10047 | // For the purposes of this lookup, we have a base object type |
10048 | // equal to that of the current context. |
10049 | if (CurContext->isRecord()) { |
10050 | R.setBaseObjectType( |
10051 | Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); |
10052 | } |
10053 | |
10054 | LookupQualifiedName(R, LookupContext); |
10055 | |
10056 | // Try to correct typos if possible. If constructor name lookup finds no |
10057 | // results, that means the named class has no explicit constructors, and we |
10058 | // suppressed declaring implicit ones (probably because it's dependent or |
10059 | // invalid). |
10060 | if (R.empty() && |
10061 | NameInfo.getName().getNameKind() != DeclarationName::CXXConstructorName) { |
10062 | // HACK: Work around a bug in libstdc++'s detection of ::gets. Sometimes |
10063 | // it will believe that glibc provides a ::gets in cases where it does not, |
10064 | // and will try to pull it into namespace std with a using-declaration. |
10065 | // Just ignore the using-declaration in that case. |
10066 | auto *II = NameInfo.getName().getAsIdentifierInfo(); |
10067 | if (getLangOpts().CPlusPlus14 && II && II->isStr("gets") && |
10068 | CurContext->isStdNamespace() && |
10069 | isa<TranslationUnitDecl>(LookupContext) && |
10070 | getSourceManager().isInSystemHeader(UsingLoc)) |
10071 | return nullptr; |
10072 | UsingValidatorCCC CCC(HasTypenameKeyword, IsInstantiation, SS.getScopeRep(), |
10073 | dyn_cast<CXXRecordDecl>(CurContext)); |
10074 | if (TypoCorrection Corrected = |
10075 | CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, CCC, |
10076 | CTK_ErrorRecovery)) { |
10077 | // We reject candidates where DroppedSpecifier == true, hence the |
10078 | // literal '0' below. |
10079 | diagnoseTypo(Corrected, PDiag(diag::err_no_member_suggest) |
10080 | << NameInfo.getName() << LookupContext << 0 |
10081 | << SS.getRange()); |
10082 | |
10083 | // If we picked a correction with no attached Decl we can't do anything |
10084 | // useful with it, bail out. |
10085 | NamedDecl *ND = Corrected.getCorrectionDecl(); |
10086 | if (!ND) |
10087 | return BuildInvalid(); |
10088 | |
10089 | // If we corrected to an inheriting constructor, handle it as one. |
10090 | auto *RD = dyn_cast<CXXRecordDecl>(ND); |
10091 | if (RD && RD->isInjectedClassName()) { |
10092 | // The parent of the injected class name is the class itself. |
10093 | RD = cast<CXXRecordDecl>(RD->getParent()); |
10094 | |
10095 | // Fix up the information we'll use to build the using declaration. |
10096 | if (Corrected.WillReplaceSpecifier()) { |
10097 | NestedNameSpecifierLocBuilder Builder; |
10098 | Builder.MakeTrivial(Context, Corrected.getCorrectionSpecifier(), |
10099 | QualifierLoc.getSourceRange()); |
10100 | QualifierLoc = Builder.getWithLocInContext(Context); |
10101 | } |
10102 | |
10103 | // In this case, the name we introduce is the name of a derived class |
10104 | // constructor. |
10105 | auto *CurClass = cast<CXXRecordDecl>(CurContext); |
10106 | UsingName.setName(Context.DeclarationNames.getCXXConstructorName( |
10107 | Context.getCanonicalType(Context.getRecordType(CurClass)))); |
10108 | UsingName.setNamedTypeInfo(nullptr); |
10109 | for (auto *Ctor : LookupConstructors(RD)) |
10110 | R.addDecl(Ctor); |
10111 | R.resolveKind(); |
10112 | } else { |
10113 | // FIXME: Pick up all the declarations if we found an overloaded |
10114 | // function. |
10115 | UsingName.setName(ND->getDeclName()); |
10116 | R.addDecl(ND); |
10117 | } |
10118 | } else { |
10119 | Diag(IdentLoc, diag::err_no_member) |
10120 | << NameInfo.getName() << LookupContext << SS.getRange(); |
10121 | return BuildInvalid(); |
10122 | } |
10123 | } |
10124 | |
10125 | if (R.isAmbiguous()) |
10126 | return BuildInvalid(); |
10127 | |
10128 | if (HasTypenameKeyword) { |
10129 | // If we asked for a typename and got a non-type decl, error out. |
10130 | if (!R.getAsSingle<TypeDecl>()) { |
10131 | Diag(IdentLoc, diag::err_using_typename_non_type); |
10132 | for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) |
10133 | Diag((*I)->getUnderlyingDecl()->getLocation(), |
10134 | diag::note_using_decl_target); |
10135 | return BuildInvalid(); |
10136 | } |
10137 | } else { |
10138 | // If we asked for a non-typename and we got a type, error out, |
10139 | // but only if this is an instantiation of an unresolved using |
10140 | // decl. Otherwise just silently find the type name. |
10141 | if (IsInstantiation && R.getAsSingle<TypeDecl>()) { |
10142 | Diag(IdentLoc, diag::err_using_dependent_value_is_type); |
10143 | Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); |
10144 | return BuildInvalid(); |
10145 | } |
10146 | } |
10147 | |
10148 | // C++14 [namespace.udecl]p6: |
10149 | // A using-declaration shall not name a namespace. |
10150 | if (R.getAsSingle<NamespaceDecl>()) { |
10151 | Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) |
10152 | << SS.getRange(); |
10153 | return BuildInvalid(); |
10154 | } |
10155 | |
10156 | // C++14 [namespace.udecl]p7: |
10157 | // A using-declaration shall not name a scoped enumerator. |
10158 | if (auto *ED = R.getAsSingle<EnumConstantDecl>()) { |
10159 | if (cast<EnumDecl>(ED->getDeclContext())->isScoped()) { |
10160 | Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_scoped_enum) |
10161 | << SS.getRange(); |
10162 | return BuildInvalid(); |
10163 | } |
10164 | } |
10165 | |
10166 | UsingDecl *UD = BuildValid(); |
10167 | |
10168 | // Some additional rules apply to inheriting constructors. |
10169 | if (UsingName.getName().getNameKind() == |
10170 | DeclarationName::CXXConstructorName) { |
10171 | // Suppress access diagnostics; the access check is instead performed at the |
10172 | // point of use for an inheriting constructor. |
10173 | R.suppressDiagnostics(); |
10174 | if (CheckInheritingConstructorUsingDecl(UD)) |
10175 | return UD; |
10176 | } |
10177 | |
10178 | for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { |
10179 | UsingShadowDecl *PrevDecl = nullptr; |
10180 | if (!CheckUsingShadowDecl(UD, *I, Previous, PrevDecl)) |
10181 | BuildUsingShadowDecl(S, UD, *I, PrevDecl); |
10182 | } |
10183 | |
10184 | return UD; |
10185 | } |
10186 | |
10187 | NamedDecl *Sema::BuildUsingPackDecl(NamedDecl *InstantiatedFrom, |
10188 | ArrayRef<NamedDecl *> Expansions) { |
10189 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 10191, __PRETTY_FUNCTION__)) |
10190 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 10191, __PRETTY_FUNCTION__)) |
10191 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 10191, __PRETTY_FUNCTION__)); |
10192 | |
10193 | auto *UPD = |
10194 | UsingPackDecl::Create(Context, CurContext, InstantiatedFrom, Expansions); |
10195 | UPD->setAccess(InstantiatedFrom->getAccess()); |
10196 | CurContext->addDecl(UPD); |
10197 | return UPD; |
10198 | } |
10199 | |
10200 | /// Additional checks for a using declaration referring to a constructor name. |
10201 | bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { |
10202 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 10202, __PRETTY_FUNCTION__)); |
10203 | |
10204 | const Type *SourceType = UD->getQualifier()->getAsType(); |
10205 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 10206, __PRETTY_FUNCTION__)) |
10206 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 10206, __PRETTY_FUNCTION__)); |
10207 | CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); |
10208 | |
10209 | // Check whether the named type is a direct base class. |
10210 | bool AnyDependentBases = false; |
10211 | auto *Base = findDirectBaseWithType(TargetClass, QualType(SourceType, 0), |
10212 | AnyDependentBases); |
10213 | if (!Base && !AnyDependentBases) { |
10214 | Diag(UD->getUsingLoc(), |
10215 | diag::err_using_decl_constructor_not_in_direct_base) |
10216 | << UD->getNameInfo().getSourceRange() |
10217 | << QualType(SourceType, 0) << TargetClass; |
10218 | UD->setInvalidDecl(); |
10219 | return true; |
10220 | } |
10221 | |
10222 | if (Base) |
10223 | Base->setInheritConstructors(); |
10224 | |
10225 | return false; |
10226 | } |
10227 | |
10228 | /// Checks that the given using declaration is not an invalid |
10229 | /// redeclaration. Note that this is checking only for the using decl |
10230 | /// itself, not for any ill-formedness among the UsingShadowDecls. |
10231 | bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, |
10232 | bool HasTypenameKeyword, |
10233 | const CXXScopeSpec &SS, |
10234 | SourceLocation NameLoc, |
10235 | const LookupResult &Prev) { |
10236 | NestedNameSpecifier *Qual = SS.getScopeRep(); |
10237 | |
10238 | // C++03 [namespace.udecl]p8: |
10239 | // C++0x [namespace.udecl]p10: |
10240 | // A using-declaration is a declaration and can therefore be used |
10241 | // repeatedly where (and only where) multiple declarations are |
10242 | // allowed. |
10243 | // |
10244 | // That's in non-member contexts. |
10245 | if (!CurContext->getRedeclContext()->isRecord()) { |
10246 | // A dependent qualifier outside a class can only ever resolve to an |
10247 | // enumeration type. Therefore it conflicts with any other non-type |
10248 | // declaration in the same scope. |
10249 | // FIXME: How should we check for dependent type-type conflicts at block |
10250 | // scope? |
10251 | if (Qual->isDependent() && !HasTypenameKeyword) { |
10252 | for (auto *D : Prev) { |
10253 | if (!isa<TypeDecl>(D) && !isa<UsingDecl>(D) && !isa<UsingPackDecl>(D)) { |
10254 | bool OldCouldBeEnumerator = |
10255 | isa<UnresolvedUsingValueDecl>(D) || isa<EnumConstantDecl>(D); |
10256 | Diag(NameLoc, |
10257 | OldCouldBeEnumerator ? diag::err_redefinition |
10258 | : diag::err_redefinition_different_kind) |
10259 | << Prev.getLookupName(); |
10260 | Diag(D->getLocation(), diag::note_previous_definition); |
10261 | return true; |
10262 | } |
10263 | } |
10264 | } |
10265 | return false; |
10266 | } |
10267 | |
10268 | for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { |
10269 | NamedDecl *D = *I; |
10270 | |
10271 | bool DTypename; |
10272 | NestedNameSpecifier *DQual; |
10273 | if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { |
10274 | DTypename = UD->hasTypename(); |
10275 | DQual = UD->getQualifier(); |
10276 | } else if (UnresolvedUsingValueDecl *UD |
10277 | = dyn_cast<UnresolvedUsingValueDecl>(D)) { |
10278 | DTypename = false; |
10279 | DQual = UD->getQualifier(); |
10280 | } else if (UnresolvedUsingTypenameDecl *UD |
10281 | = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { |
10282 | DTypename = true; |
10283 | DQual = UD->getQualifier(); |
10284 | } else continue; |
10285 | |
10286 | // using decls differ if one says 'typename' and the other doesn't. |
10287 | // FIXME: non-dependent using decls? |
10288 | if (HasTypenameKeyword != DTypename) continue; |
10289 | |
10290 | // using decls differ if they name different scopes (but note that |
10291 | // template instantiation can cause this check to trigger when it |
10292 | // didn't before instantiation). |
10293 | if (Context.getCanonicalNestedNameSpecifier(Qual) != |
10294 | Context.getCanonicalNestedNameSpecifier(DQual)) |
10295 | continue; |
10296 | |
10297 | Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); |
10298 | Diag(D->getLocation(), diag::note_using_decl) << 1; |
10299 | return true; |
10300 | } |
10301 | |
10302 | return false; |
10303 | } |
10304 | |
10305 | |
10306 | /// Checks that the given nested-name qualifier used in a using decl |
10307 | /// in the current context is appropriately related to the current |
10308 | /// scope. If an error is found, diagnoses it and returns true. |
10309 | bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, |
10310 | bool HasTypename, |
10311 | const CXXScopeSpec &SS, |
10312 | const DeclarationNameInfo &NameInfo, |
10313 | SourceLocation NameLoc) { |
10314 | DeclContext *NamedContext = computeDeclContext(SS); |
10315 | |
10316 | if (!CurContext->isRecord()) { |
10317 | // C++03 [namespace.udecl]p3: |
10318 | // C++0x [namespace.udecl]p8: |
10319 | // A using-declaration for a class member shall be a member-declaration. |
10320 | |
10321 | // If we weren't able to compute a valid scope, it might validly be a |
10322 | // dependent class scope or a dependent enumeration unscoped scope. If |
10323 | // we have a 'typename' keyword, the scope must resolve to a class type. |
10324 | if ((HasTypename && !NamedContext) || |
10325 | (NamedContext && NamedContext->getRedeclContext()->isRecord())) { |
10326 | auto *RD = NamedContext |
10327 | ? cast<CXXRecordDecl>(NamedContext->getRedeclContext()) |
10328 | : nullptr; |
10329 | if (RD && RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), RD)) |
10330 | RD = nullptr; |
10331 | |
10332 | Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) |
10333 | << SS.getRange(); |
10334 | |
10335 | // If we have a complete, non-dependent source type, try to suggest a |
10336 | // way to get the same effect. |
10337 | if (!RD) |
10338 | return true; |
10339 | |
10340 | // Find what this using-declaration was referring to. |
10341 | LookupResult R(*this, NameInfo, LookupOrdinaryName); |
10342 | R.setHideTags(false); |
10343 | R.suppressDiagnostics(); |
10344 | LookupQualifiedName(R, RD); |
10345 | |
10346 | if (R.getAsSingle<TypeDecl>()) { |
10347 | if (getLangOpts().CPlusPlus11) { |
10348 | // Convert 'using X::Y;' to 'using Y = X::Y;'. |
10349 | Diag(SS.getBeginLoc(), diag::note_using_decl_class_member_workaround) |
10350 | << 0 // alias declaration |
10351 | << FixItHint::CreateInsertion(SS.getBeginLoc(), |
10352 | NameInfo.getName().getAsString() + |
10353 | " = "); |
10354 | } else { |
10355 | // Convert 'using X::Y;' to 'typedef X::Y Y;'. |
10356 | SourceLocation InsertLoc = getLocForEndOfToken(NameInfo.getEndLoc()); |
10357 | Diag(InsertLoc, diag::note_using_decl_class_member_workaround) |
10358 | << 1 // typedef declaration |
10359 | << FixItHint::CreateReplacement(UsingLoc, "typedef") |
10360 | << FixItHint::CreateInsertion( |
10361 | InsertLoc, " " + NameInfo.getName().getAsString()); |
10362 | } |
10363 | } else if (R.getAsSingle<VarDecl>()) { |
10364 | // Don't provide a fixit outside C++11 mode; we don't want to suggest |
10365 | // repeating the type of the static data member here. |
10366 | FixItHint FixIt; |
10367 | if (getLangOpts().CPlusPlus11) { |
10368 | // Convert 'using X::Y;' to 'auto &Y = X::Y;'. |
10369 | FixIt = FixItHint::CreateReplacement( |
10370 | UsingLoc, "auto &" + NameInfo.getName().getAsString() + " = "); |
10371 | } |
10372 | |
10373 | Diag(UsingLoc, diag::note_using_decl_class_member_workaround) |
10374 | << 2 // reference declaration |
10375 | << FixIt; |
10376 | } else if (R.getAsSingle<EnumConstantDecl>()) { |
10377 | // Don't provide a fixit outside C++11 mode; we don't want to suggest |
10378 | // repeating the type of the enumeration here, and we can't do so if |
10379 | // the type is anonymous. |
10380 | FixItHint FixIt; |
10381 | if (getLangOpts().CPlusPlus11) { |
10382 | // Convert 'using X::Y;' to 'auto &Y = X::Y;'. |
10383 | FixIt = FixItHint::CreateReplacement( |
10384 | UsingLoc, |
10385 | "constexpr auto " + NameInfo.getName().getAsString() + " = "); |
10386 | } |
10387 | |
10388 | Diag(UsingLoc, diag::note_using_decl_class_member_workaround) |
10389 | << (getLangOpts().CPlusPlus11 ? 4 : 3) // const[expr] variable |
10390 | << FixIt; |
10391 | } |
10392 | return true; |
10393 | } |
10394 | |
10395 | // Otherwise, this might be valid. |
10396 | return false; |
10397 | } |
10398 | |
10399 | // The current scope is a record. |
10400 | |
10401 | // If the named context is dependent, we can't decide much. |
10402 | if (!NamedContext) { |
10403 | // FIXME: in C++0x, we can diagnose if we can prove that the |
10404 | // nested-name-specifier does not refer to a base class, which is |
10405 | // still possible in some cases. |
10406 | |
10407 | // Otherwise we have to conservatively report that things might be |
10408 | // okay. |
10409 | return false; |
10410 | } |
10411 | |
10412 | if (!NamedContext->isRecord()) { |
10413 | // Ideally this would point at the last name in the specifier, |
10414 | // but we don't have that level of source info. |
10415 | Diag(SS.getRange().getBegin(), |
10416 | diag::err_using_decl_nested_name_specifier_is_not_class) |
10417 | << SS.getScopeRep() << SS.getRange(); |
10418 | return true; |
10419 | } |
10420 | |
10421 | if (!NamedContext->isDependentContext() && |
10422 | RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) |
10423 | return true; |
10424 | |
10425 | if (getLangOpts().CPlusPlus11) { |
10426 | // C++11 [namespace.udecl]p3: |
10427 | // In a using-declaration used as a member-declaration, the |
10428 | // nested-name-specifier shall name a base class of the class |
10429 | // being defined. |
10430 | |
10431 | if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( |
10432 | cast<CXXRecordDecl>(NamedContext))) { |
10433 | if (CurContext == NamedContext) { |
10434 | Diag(NameLoc, |
10435 | diag::err_using_decl_nested_name_specifier_is_current_class) |
10436 | << SS.getRange(); |
10437 | return true; |
10438 | } |
10439 | |
10440 | if (!cast<CXXRecordDecl>(NamedContext)->isInvalidDecl()) { |
10441 | Diag(SS.getRange().getBegin(), |
10442 | diag::err_using_decl_nested_name_specifier_is_not_base_class) |
10443 | << SS.getScopeRep() |
10444 | << cast<CXXRecordDecl>(CurContext) |
10445 | << SS.getRange(); |
10446 | } |
10447 | return true; |
10448 | } |
10449 | |
10450 | return false; |
10451 | } |
10452 | |
10453 | // C++03 [namespace.udecl]p4: |
10454 | // A using-declaration used as a member-declaration shall refer |
10455 | // to a member of a base class of the class being defined [etc.]. |
10456 | |
10457 | // Salient point: SS doesn't have to name a base class as long as |
10458 | // lookup only finds members from base classes. Therefore we can |
10459 | // diagnose here only if we can prove that that can't happen, |
10460 | // i.e. if the class hierarchies provably don't intersect. |
10461 | |
10462 | // TODO: it would be nice if "definitely valid" results were cached |
10463 | // in the UsingDecl and UsingShadowDecl so that these checks didn't |
10464 | // need to be repeated. |
10465 | |
10466 | llvm::SmallPtrSet<const CXXRecordDecl *, 4> Bases; |
10467 | auto Collect = [&Bases](const CXXRecordDecl *Base) { |
10468 | Bases.insert(Base); |
10469 | return true; |
10470 | }; |
10471 | |
10472 | // Collect all bases. Return false if we find a dependent base. |
10473 | if (!cast<CXXRecordDecl>(CurContext)->forallBases(Collect)) |
10474 | return false; |
10475 | |
10476 | // Returns true if the base is dependent or is one of the accumulated base |
10477 | // classes. |
10478 | auto IsNotBase = [&Bases](const CXXRecordDecl *Base) { |
10479 | return !Bases.count(Base); |
10480 | }; |
10481 | |
10482 | // Return false if the class has a dependent base or if it or one |
10483 | // of its bases is present in the base set of the current context. |
10484 | if (Bases.count(cast<CXXRecordDecl>(NamedContext)) || |
10485 | !cast<CXXRecordDecl>(NamedContext)->forallBases(IsNotBase)) |
10486 | return false; |
10487 | |
10488 | Diag(SS.getRange().getBegin(), |
10489 | diag::err_using_decl_nested_name_specifier_is_not_base_class) |
10490 | << SS.getScopeRep() |
10491 | << cast<CXXRecordDecl>(CurContext) |
10492 | << SS.getRange(); |
10493 | |
10494 | return true; |
10495 | } |
10496 | |
10497 | Decl *Sema::ActOnAliasDeclaration(Scope *S, AccessSpecifier AS, |
10498 | MultiTemplateParamsArg TemplateParamLists, |
10499 | SourceLocation UsingLoc, UnqualifiedId &Name, |
10500 | const ParsedAttributesView &AttrList, |
10501 | TypeResult Type, Decl *DeclFromDeclSpec) { |
10502 | // Skip up to the relevant declaration scope. |
10503 | while (S->isTemplateParamScope()) |
10504 | S = S->getParent(); |
10505 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 10506, __PRETTY_FUNCTION__)) |
10506 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 10506, __PRETTY_FUNCTION__)); |
10507 | |
10508 | if (Type.isInvalid()) |
10509 | return nullptr; |
10510 | |
10511 | bool Invalid = false; |
10512 | DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); |
10513 | TypeSourceInfo *TInfo = nullptr; |
10514 | GetTypeFromParser(Type.get(), &TInfo); |
10515 | |
10516 | if (DiagnoseClassNameShadow(CurContext, NameInfo)) |
10517 | return nullptr; |
10518 | |
10519 | if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, |
10520 | UPPC_DeclarationType)) { |
10521 | Invalid = true; |
10522 | TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, |
10523 | TInfo->getTypeLoc().getBeginLoc()); |
10524 | } |
10525 | |
10526 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, |
10527 | TemplateParamLists.size() |
10528 | ? forRedeclarationInCurContext() |
10529 | : ForVisibleRedeclaration); |
10530 | LookupName(Previous, S); |
10531 | |
10532 | // Warn about shadowing the name of a template parameter. |
10533 | if (Previous.isSingleResult() && |
10534 | Previous.getFoundDecl()->isTemplateParameter()) { |
10535 | DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); |
10536 | Previous.clear(); |
10537 | } |
10538 | |
10539 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 10540, __PRETTY_FUNCTION__)) |
10540 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 10540, __PRETTY_FUNCTION__)); |
10541 | TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, |
10542 | Name.StartLocation, |
10543 | Name.Identifier, TInfo); |
10544 | |
10545 | NewTD->setAccess(AS); |
10546 | |
10547 | if (Invalid) |
10548 | NewTD->setInvalidDecl(); |
10549 | |
10550 | ProcessDeclAttributeList(S, NewTD, AttrList); |
10551 | AddPragmaAttributes(S, NewTD); |
10552 | |
10553 | CheckTypedefForVariablyModifiedType(S, NewTD); |
10554 | Invalid |= NewTD->isInvalidDecl(); |
10555 | |
10556 | bool Redeclaration = false; |
10557 | |
10558 | NamedDecl *NewND; |
10559 | if (TemplateParamLists.size()) { |
10560 | TypeAliasTemplateDecl *OldDecl = nullptr; |
10561 | TemplateParameterList *OldTemplateParams = nullptr; |
10562 | |
10563 | if (TemplateParamLists.size() != 1) { |
10564 | Diag(UsingLoc, diag::err_alias_template_extra_headers) |
10565 | << SourceRange(TemplateParamLists[1]->getTemplateLoc(), |
10566 | TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); |
10567 | } |
10568 | TemplateParameterList *TemplateParams = TemplateParamLists[0]; |
10569 | |
10570 | // Check that we can declare a template here. |
10571 | if (CheckTemplateDeclScope(S, TemplateParams)) |
10572 | return nullptr; |
10573 | |
10574 | // Only consider previous declarations in the same scope. |
10575 | FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, |
10576 | /*ExplicitInstantiationOrSpecialization*/false); |
10577 | if (!Previous.empty()) { |
10578 | Redeclaration = true; |
10579 | |
10580 | OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); |
10581 | if (!OldDecl && !Invalid) { |
10582 | Diag(UsingLoc, diag::err_redefinition_different_kind) |
10583 | << Name.Identifier; |
10584 | |
10585 | NamedDecl *OldD = Previous.getRepresentativeDecl(); |
10586 | if (OldD->getLocation().isValid()) |
10587 | Diag(OldD->getLocation(), diag::note_previous_definition); |
10588 | |
10589 | Invalid = true; |
10590 | } |
10591 | |
10592 | if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { |
10593 | if (TemplateParameterListsAreEqual(TemplateParams, |
10594 | OldDecl->getTemplateParameters(), |
10595 | /*Complain=*/true, |
10596 | TPL_TemplateMatch)) |
10597 | OldTemplateParams = |
10598 | OldDecl->getMostRecentDecl()->getTemplateParameters(); |
10599 | else |
10600 | Invalid = true; |
10601 | |
10602 | TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); |
10603 | if (!Invalid && |
10604 | !Context.hasSameType(OldTD->getUnderlyingType(), |
10605 | NewTD->getUnderlyingType())) { |
10606 | // FIXME: The C++0x standard does not clearly say this is ill-formed, |
10607 | // but we can't reasonably accept it. |
10608 | Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) |
10609 | << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); |
10610 | if (OldTD->getLocation().isValid()) |
10611 | Diag(OldTD->getLocation(), diag::note_previous_definition); |
10612 | Invalid = true; |
10613 | } |
10614 | } |
10615 | } |
10616 | |
10617 | // Merge any previous default template arguments into our parameters, |
10618 | // and check the parameter list. |
10619 | if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, |
10620 | TPC_TypeAliasTemplate)) |
10621 | return nullptr; |
10622 | |
10623 | TypeAliasTemplateDecl *NewDecl = |
10624 | TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, |
10625 | Name.Identifier, TemplateParams, |
10626 | NewTD); |
10627 | NewTD->setDescribedAliasTemplate(NewDecl); |
10628 | |
10629 | NewDecl->setAccess(AS); |
10630 | |
10631 | if (Invalid) |
10632 | NewDecl->setInvalidDecl(); |
10633 | else if (OldDecl) { |
10634 | NewDecl->setPreviousDecl(OldDecl); |
10635 | CheckRedeclarationModuleOwnership(NewDecl, OldDecl); |
10636 | } |
10637 | |
10638 | NewND = NewDecl; |
10639 | } else { |
10640 | if (auto *TD = dyn_cast_or_null<TagDecl>(DeclFromDeclSpec)) { |
10641 | setTagNameForLinkagePurposes(TD, NewTD); |
10642 | handleTagNumbering(TD, S); |
10643 | } |
10644 | ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); |
10645 | NewND = NewTD; |
10646 | } |
10647 | |
10648 | PushOnScopeChains(NewND, S); |
10649 | ActOnDocumentableDecl(NewND); |
10650 | return NewND; |
10651 | } |
10652 | |
10653 | Decl *Sema::ActOnNamespaceAliasDef(Scope *S, SourceLocation NamespaceLoc, |
10654 | SourceLocation AliasLoc, |
10655 | IdentifierInfo *Alias, CXXScopeSpec &SS, |
10656 | SourceLocation IdentLoc, |
10657 | IdentifierInfo *Ident) { |
10658 | |
10659 | // Lookup the namespace name. |
10660 | LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); |
10661 | LookupParsedName(R, S, &SS); |
10662 | |
10663 | if (R.isAmbiguous()) |
10664 | return nullptr; |
10665 | |
10666 | if (R.empty()) { |
10667 | if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { |
10668 | Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); |
10669 | return nullptr; |
10670 | } |
10671 | } |
10672 | assert(!R.isAmbiguous() && !R.empty())((!R.isAmbiguous() && !R.empty()) ? static_cast<void > (0) : __assert_fail ("!R.isAmbiguous() && !R.empty()" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 10672, __PRETTY_FUNCTION__)); |
10673 | NamedDecl *ND = R.getRepresentativeDecl(); |
10674 | |
10675 | // Check if we have a previous declaration with the same name. |
10676 | LookupResult PrevR(*this, Alias, AliasLoc, LookupOrdinaryName, |
10677 | ForVisibleRedeclaration); |
10678 | LookupName(PrevR, S); |
10679 | |
10680 | // Check we're not shadowing a template parameter. |
10681 | if (PrevR.isSingleResult() && PrevR.getFoundDecl()->isTemplateParameter()) { |
10682 | DiagnoseTemplateParameterShadow(AliasLoc, PrevR.getFoundDecl()); |
10683 | PrevR.clear(); |
10684 | } |
10685 | |
10686 | // Filter out any other lookup result from an enclosing scope. |
10687 | FilterLookupForScope(PrevR, CurContext, S, /*ConsiderLinkage*/false, |
10688 | /*AllowInlineNamespace*/false); |
10689 | |
10690 | // Find the previous declaration and check that we can redeclare it. |
10691 | NamespaceAliasDecl *Prev = nullptr; |
10692 | if (PrevR.isSingleResult()) { |
10693 | NamedDecl *PrevDecl = PrevR.getRepresentativeDecl(); |
10694 | if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { |
10695 | // We already have an alias with the same name that points to the same |
10696 | // namespace; check that it matches. |
10697 | if (AD->getNamespace()->Equals(getNamespaceDecl(ND))) { |
10698 | Prev = AD; |
10699 | } else if (isVisible(PrevDecl)) { |
10700 | Diag(AliasLoc, diag::err_redefinition_different_namespace_alias) |
10701 | << Alias; |
10702 | Diag(AD->getLocation(), diag::note_previous_namespace_alias) |
10703 | << AD->getNamespace(); |
10704 | return nullptr; |
10705 | } |
10706 | } else if (isVisible(PrevDecl)) { |
10707 | unsigned DiagID = isa<NamespaceDecl>(PrevDecl->getUnderlyingDecl()) |
10708 | ? diag::err_redefinition |
10709 | : diag::err_redefinition_different_kind; |
10710 | Diag(AliasLoc, DiagID) << Alias; |
10711 | Diag(PrevDecl->getLocation(), diag::note_previous_definition); |
10712 | return nullptr; |
10713 | } |
10714 | } |
10715 | |
10716 | // The use of a nested name specifier may trigger deprecation warnings. |
10717 | DiagnoseUseOfDecl(ND, IdentLoc); |
10718 | |
10719 | NamespaceAliasDecl *AliasDecl = |
10720 | NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, |
10721 | Alias, SS.getWithLocInContext(Context), |
10722 | IdentLoc, ND); |
10723 | if (Prev) |
10724 | AliasDecl->setPreviousDecl(Prev); |
10725 | |
10726 | PushOnScopeChains(AliasDecl, S); |
10727 | return AliasDecl; |
10728 | } |
10729 | |
10730 | namespace { |
10731 | struct SpecialMemberExceptionSpecInfo |
10732 | : SpecialMemberVisitor<SpecialMemberExceptionSpecInfo> { |
10733 | SourceLocation Loc; |
10734 | Sema::ImplicitExceptionSpecification ExceptSpec; |
10735 | |
10736 | SpecialMemberExceptionSpecInfo(Sema &S, CXXMethodDecl *MD, |
10737 | Sema::CXXSpecialMember CSM, |
10738 | Sema::InheritedConstructorInfo *ICI, |
10739 | SourceLocation Loc) |
10740 | : SpecialMemberVisitor(S, MD, CSM, ICI), Loc(Loc), ExceptSpec(S) {} |
10741 | |
10742 | bool visitBase(CXXBaseSpecifier *Base); |
10743 | bool visitField(FieldDecl *FD); |
10744 | |
10745 | void visitClassSubobject(CXXRecordDecl *Class, Subobject Subobj, |
10746 | unsigned Quals); |
10747 | |
10748 | void visitSubobjectCall(Subobject Subobj, |
10749 | Sema::SpecialMemberOverloadResult SMOR); |
10750 | }; |
10751 | } |
10752 | |
10753 | bool SpecialMemberExceptionSpecInfo::visitBase(CXXBaseSpecifier *Base) { |
10754 | auto *RT = Base->getType()->getAs<RecordType>(); |
10755 | if (!RT) |
10756 | return false; |
10757 | |
10758 | auto *BaseClass = cast<CXXRecordDecl>(RT->getDecl()); |
10759 | Sema::SpecialMemberOverloadResult SMOR = lookupInheritedCtor(BaseClass); |
10760 | if (auto *BaseCtor = SMOR.getMethod()) { |
10761 | visitSubobjectCall(Base, BaseCtor); |
10762 | return false; |
10763 | } |
10764 | |
10765 | visitClassSubobject(BaseClass, Base, 0); |
10766 | return false; |
10767 | } |
10768 | |
10769 | bool SpecialMemberExceptionSpecInfo::visitField(FieldDecl *FD) { |
10770 | if (CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer()) { |
10771 | Expr *E = FD->getInClassInitializer(); |
10772 | if (!E) |
10773 | // FIXME: It's a little wasteful to build and throw away a |
10774 | // CXXDefaultInitExpr here. |
10775 | // FIXME: We should have a single context note pointing at Loc, and |
10776 | // this location should be MD->getLocation() instead, since that's |
10777 | // the location where we actually use the default init expression. |
10778 | E = S.BuildCXXDefaultInitExpr(Loc, FD).get(); |
10779 | if (E) |
10780 | ExceptSpec.CalledExpr(E); |
10781 | } else if (auto *RT = S.Context.getBaseElementType(FD->getType()) |
10782 | ->getAs<RecordType>()) { |
10783 | visitClassSubobject(cast<CXXRecordDecl>(RT->getDecl()), FD, |
10784 | FD->getType().getCVRQualifiers()); |
10785 | } |
10786 | return false; |
10787 | } |
10788 | |
10789 | void SpecialMemberExceptionSpecInfo::visitClassSubobject(CXXRecordDecl *Class, |
10790 | Subobject Subobj, |
10791 | unsigned Quals) { |
10792 | FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); |
10793 | bool IsMutable = Field && Field->isMutable(); |
10794 | visitSubobjectCall(Subobj, lookupIn(Class, Quals, IsMutable)); |
10795 | } |
10796 | |
10797 | void SpecialMemberExceptionSpecInfo::visitSubobjectCall( |
10798 | Subobject Subobj, Sema::SpecialMemberOverloadResult SMOR) { |
10799 | // Note, if lookup fails, it doesn't matter what exception specification we |
10800 | // choose because the special member will be deleted. |
10801 | if (CXXMethodDecl *MD = SMOR.getMethod()) |
10802 | ExceptSpec.CalledDecl(getSubobjectLoc(Subobj), MD); |
10803 | } |
10804 | |
10805 | namespace { |
10806 | /// RAII object to register a special member as being currently declared. |
10807 | struct ComputingExceptionSpec { |
10808 | Sema &S; |
10809 | |
10810 | ComputingExceptionSpec(Sema &S, CXXMethodDecl *MD, SourceLocation Loc) |
10811 | : S(S) { |
10812 | Sema::CodeSynthesisContext Ctx; |
10813 | Ctx.Kind = Sema::CodeSynthesisContext::ExceptionSpecEvaluation; |
10814 | Ctx.PointOfInstantiation = Loc; |
10815 | Ctx.Entity = MD; |
10816 | S.pushCodeSynthesisContext(Ctx); |
Passed-by-value struct argument contains uninitialized data (e.g., field: 'SavedInNonInstantiationSFINAEContext') | |
10817 | } |
10818 | ~ComputingExceptionSpec() { |
10819 | S.popCodeSynthesisContext(); |
10820 | } |
10821 | }; |
10822 | } |
10823 | |
10824 | bool Sema::tryResolveExplicitSpecifier(ExplicitSpecifier &ExplicitSpec) { |
10825 | llvm::APSInt Result; |
10826 | ExprResult Converted = CheckConvertedConstantExpression( |
10827 | ExplicitSpec.getExpr(), Context.BoolTy, Result, CCEK_ExplicitBool); |
10828 | ExplicitSpec.setExpr(Converted.get()); |
10829 | if (Converted.isUsable() && !Converted.get()->isValueDependent()) { |
10830 | ExplicitSpec.setKind(Result.getBoolValue() |
10831 | ? ExplicitSpecKind::ResolvedTrue |
10832 | : ExplicitSpecKind::ResolvedFalse); |
10833 | return true; |
10834 | } |
10835 | ExplicitSpec.setKind(ExplicitSpecKind::Unresolved); |
10836 | return false; |
10837 | } |
10838 | |
10839 | ExplicitSpecifier Sema::ActOnExplicitBoolSpecifier(Expr *ExplicitExpr) { |
10840 | ExplicitSpecifier ES(ExplicitExpr, ExplicitSpecKind::Unresolved); |
10841 | if (!ExplicitExpr->isTypeDependent()) |
10842 | tryResolveExplicitSpecifier(ES); |
10843 | return ES; |
10844 | } |
10845 | |
10846 | static Sema::ImplicitExceptionSpecification |
10847 | ComputeDefaultedSpecialMemberExceptionSpec( |
10848 | Sema &S, SourceLocation Loc, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM, |
10849 | Sema::InheritedConstructorInfo *ICI) { |
10850 | ComputingExceptionSpec CES(S, MD, Loc); |
10851 | |
10852 | CXXRecordDecl *ClassDecl = MD->getParent(); |
10853 | |
10854 | // C++ [except.spec]p14: |
10855 | // An implicitly declared special member function (Clause 12) shall have an |
10856 | // exception-specification. [...] |
10857 | SpecialMemberExceptionSpecInfo Info(S, MD, CSM, ICI, MD->getLocation()); |
10858 | if (ClassDecl->isInvalidDecl()) |
10859 | return Info.ExceptSpec; |
10860 | |
10861 | // FIXME: If this diagnostic fires, we're probably missing a check for |
10862 | // attempting to resolve an exception specification before it's known |
10863 | // at a higher level. |
10864 | if (S.RequireCompleteType(MD->getLocation(), |
10865 | S.Context.getRecordType(ClassDecl), |
10866 | diag::err_exception_spec_incomplete_type)) |
10867 | return Info.ExceptSpec; |
10868 | |
10869 | // C++1z [except.spec]p7: |
10870 | // [Look for exceptions thrown by] a constructor selected [...] to |
10871 | // initialize a potentially constructed subobject, |
10872 | // C++1z [except.spec]p8: |
10873 | // The exception specification for an implicitly-declared destructor, or a |
10874 | // destructor without a noexcept-specifier, is potentially-throwing if and |
10875 | // only if any of the destructors for any of its potentially constructed |
10876 | // subojects is potentially throwing. |
10877 | // FIXME: We respect the first rule but ignore the "potentially constructed" |
10878 | // in the second rule to resolve a core issue (no number yet) that would have |
10879 | // us reject: |
10880 | // struct A { virtual void f() = 0; virtual ~A() noexcept(false) = 0; }; |
10881 | // struct B : A {}; |
10882 | // struct C : B { void f(); }; |
10883 | // ... due to giving B::~B() a non-throwing exception specification. |
10884 | Info.visit(Info.IsConstructor ? Info.VisitPotentiallyConstructedBases |
10885 | : Info.VisitAllBases); |
10886 | |
10887 | return Info.ExceptSpec; |
10888 | } |
10889 | |
10890 | namespace { |
10891 | /// RAII object to register a special member as being currently declared. |
10892 | struct DeclaringSpecialMember { |
10893 | Sema &S; |
10894 | Sema::SpecialMemberDecl D; |
10895 | Sema::ContextRAII SavedContext; |
10896 | bool WasAlreadyBeingDeclared; |
10897 | |
10898 | DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM) |
10899 | : S(S), D(RD, CSM), SavedContext(S, RD) { |
10900 | WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D).second; |
10901 | if (WasAlreadyBeingDeclared) |
10902 | // This almost never happens, but if it does, ensure that our cache |
10903 | // doesn't contain a stale result. |
10904 | S.SpecialMemberCache.clear(); |
10905 | else { |
10906 | // Register a note to be produced if we encounter an error while |
10907 | // declaring the special member. |
10908 | Sema::CodeSynthesisContext Ctx; |
10909 | Ctx.Kind = Sema::CodeSynthesisContext::DeclaringSpecialMember; |
10910 | // FIXME: We don't have a location to use here. Using the class's |
10911 | // location maintains the fiction that we declare all special members |
10912 | // with the class, but (1) it's not clear that lying about that helps our |
10913 | // users understand what's going on, and (2) there may be outer contexts |
10914 | // on the stack (some of which are relevant) and printing them exposes |
10915 | // our lies. |
10916 | Ctx.PointOfInstantiation = RD->getLocation(); |
10917 | Ctx.Entity = RD; |
10918 | Ctx.SpecialMember = CSM; |
10919 | S.pushCodeSynthesisContext(Ctx); |
10920 | } |
10921 | } |
10922 | ~DeclaringSpecialMember() { |
10923 | if (!WasAlreadyBeingDeclared) { |
10924 | S.SpecialMembersBeingDeclared.erase(D); |
10925 | S.popCodeSynthesisContext(); |
10926 | } |
10927 | } |
10928 | |
10929 | /// Are we already trying to declare this special member? |
10930 | bool isAlreadyBeingDeclared() const { |
10931 | return WasAlreadyBeingDeclared; |
10932 | } |
10933 | }; |
10934 | } |
10935 | |
10936 | void Sema::CheckImplicitSpecialMemberDeclaration(Scope *S, FunctionDecl *FD) { |
10937 | // Look up any existing declarations, but don't trigger declaration of all |
10938 | // implicit special members with this name. |
10939 | DeclarationName Name = FD->getDeclName(); |
10940 | LookupResult R(*this, Name, SourceLocation(), LookupOrdinaryName, |
10941 | ForExternalRedeclaration); |
10942 | for (auto *D : FD->getParent()->lookup(Name)) |
10943 | if (auto *Acceptable = R.getAcceptableDecl(D)) |
10944 | R.addDecl(Acceptable); |
10945 | R.resolveKind(); |
10946 | R.suppressDiagnostics(); |
10947 | |
10948 | CheckFunctionDeclaration(S, FD, R, /*IsMemberSpecialization*/false); |
10949 | } |
10950 | |
10951 | void Sema::setupImplicitSpecialMemberType(CXXMethodDecl *SpecialMem, |
10952 | QualType ResultTy, |
10953 | ArrayRef<QualType> Args) { |
10954 | // Build an exception specification pointing back at this constructor. |
10955 | FunctionProtoType::ExtProtoInfo EPI = getImplicitMethodEPI(*this, SpecialMem); |
10956 | |
10957 | if (getLangOpts().OpenCLCPlusPlus) { |
10958 | // OpenCL: Implicitly defaulted special member are of the generic address |
10959 | // space. |
10960 | EPI.TypeQuals.addAddressSpace(LangAS::opencl_generic); |
10961 | } |
10962 | |
10963 | auto QT = Context.getFunctionType(ResultTy, Args, EPI); |
10964 | SpecialMem->setType(QT); |
10965 | } |
10966 | |
10967 | CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( |
10968 | CXXRecordDecl *ClassDecl) { |
10969 | // C++ [class.ctor]p5: |
10970 | // A default constructor for a class X is a constructor of class X |
10971 | // that can be called without an argument. If there is no |
10972 | // user-declared constructor for class X, a default constructor is |
10973 | // implicitly declared. An implicitly-declared default constructor |
10974 | // is an inline public member of its class. |
10975 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 10976, __PRETTY_FUNCTION__)) |
10976 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 10976, __PRETTY_FUNCTION__)); |
10977 | |
10978 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor); |
10979 | if (DSM.isAlreadyBeingDeclared()) |
10980 | return nullptr; |
10981 | |
10982 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, |
10983 | CXXDefaultConstructor, |
10984 | false); |
10985 | |
10986 | // Create the actual constructor declaration. |
10987 | CanQualType ClassType |
10988 | = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); |
10989 | SourceLocation ClassLoc = ClassDecl->getLocation(); |
10990 | DeclarationName Name |
10991 | = Context.DeclarationNames.getCXXConstructorName(ClassType); |
10992 | DeclarationNameInfo NameInfo(Name, ClassLoc); |
10993 | CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( |
10994 | Context, ClassDecl, ClassLoc, NameInfo, /*Type*/ QualType(), |
10995 | /*TInfo=*/nullptr, ExplicitSpecifier(), |
10996 | /*isInline=*/true, /*isImplicitlyDeclared=*/true, Constexpr); |
10997 | DefaultCon->setAccess(AS_public); |
10998 | DefaultCon->setDefaulted(); |
10999 | |
11000 | if (getLangOpts().CUDA) { |
11001 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXDefaultConstructor, |
11002 | DefaultCon, |
11003 | /* ConstRHS */ false, |
11004 | /* Diagnose */ false); |
11005 | } |
11006 | |
11007 | setupImplicitSpecialMemberType(DefaultCon, Context.VoidTy, None); |
11008 | |
11009 | // We don't need to use SpecialMemberIsTrivial here; triviality for default |
11010 | // constructors is easy to compute. |
11011 | DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); |
11012 | |
11013 | // Note that we have declared this constructor. |
11014 | ++getASTContext().NumImplicitDefaultConstructorsDeclared; |
11015 | |
11016 | Scope *S = getScopeForContext(ClassDecl); |
11017 | CheckImplicitSpecialMemberDeclaration(S, DefaultCon); |
11018 | |
11019 | if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) |
11020 | SetDeclDeleted(DefaultCon, ClassLoc); |
11021 | |
11022 | if (S) |
11023 | PushOnScopeChains(DefaultCon, S, false); |
11024 | ClassDecl->addDecl(DefaultCon); |
11025 | |
11026 | return DefaultCon; |
11027 | } |
11028 | |
11029 | void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, |
11030 | CXXConstructorDecl *Constructor) { |
11031 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11034, __PRETTY_FUNCTION__)) |
11032 | !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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11034, __PRETTY_FUNCTION__)) |
11033 | !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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11034, __PRETTY_FUNCTION__)) |
11034 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11034, __PRETTY_FUNCTION__)); |
11035 | if (Constructor->willHaveBody() || Constructor->isInvalidDecl()) |
11036 | return; |
11037 | |
11038 | CXXRecordDecl *ClassDecl = Constructor->getParent(); |
11039 | assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor")((ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl && \"DefineImplicitDefaultConstructor - invalid constructor\"" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11039, __PRETTY_FUNCTION__)); |
11040 | |
11041 | SynthesizedFunctionScope Scope(*this, Constructor); |
11042 | |
11043 | // The exception specification is needed because we are defining the |
11044 | // function. |
11045 | ResolveExceptionSpec(CurrentLocation, |
11046 | Constructor->getType()->castAs<FunctionProtoType>()); |
11047 | MarkVTableUsed(CurrentLocation, ClassDecl); |
11048 | |
11049 | // Add a context note for diagnostics produced after this point. |
11050 | Scope.addContextNote(CurrentLocation); |
11051 | |
11052 | if (SetCtorInitializers(Constructor, /*AnyErrors=*/false)) { |
11053 | Constructor->setInvalidDecl(); |
11054 | return; |
11055 | } |
11056 | |
11057 | SourceLocation Loc = Constructor->getEndLoc().isValid() |
11058 | ? Constructor->getEndLoc() |
11059 | : Constructor->getLocation(); |
11060 | Constructor->setBody(new (Context) CompoundStmt(Loc)); |
11061 | Constructor->markUsed(Context); |
11062 | |
11063 | if (ASTMutationListener *L = getASTMutationListener()) { |
11064 | L->CompletedImplicitDefinition(Constructor); |
11065 | } |
11066 | |
11067 | DiagnoseUninitializedFields(*this, Constructor); |
11068 | } |
11069 | |
11070 | void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { |
11071 | // Perform any delayed checks on exception specifications. |
11072 | CheckDelayedMemberExceptionSpecs(); |
11073 | } |
11074 | |
11075 | /// Find or create the fake constructor we synthesize to model constructing an |
11076 | /// object of a derived class via a constructor of a base class. |
11077 | CXXConstructorDecl * |
11078 | Sema::findInheritingConstructor(SourceLocation Loc, |
11079 | CXXConstructorDecl *BaseCtor, |
11080 | ConstructorUsingShadowDecl *Shadow) { |
11081 | CXXRecordDecl *Derived = Shadow->getParent(); |
11082 | SourceLocation UsingLoc = Shadow->getLocation(); |
11083 | |
11084 | // FIXME: Add a new kind of DeclarationName for an inherited constructor. |
11085 | // For now we use the name of the base class constructor as a member of the |
11086 | // derived class to indicate a (fake) inherited constructor name. |
11087 | DeclarationName Name = BaseCtor->getDeclName(); |
11088 | |
11089 | // Check to see if we already have a fake constructor for this inherited |
11090 | // constructor call. |
11091 | for (NamedDecl *Ctor : Derived->lookup(Name)) |
11092 | if (declaresSameEntity(cast<CXXConstructorDecl>(Ctor) |
11093 | ->getInheritedConstructor() |
11094 | .getConstructor(), |
11095 | BaseCtor)) |
11096 | return cast<CXXConstructorDecl>(Ctor); |
11097 | |
11098 | DeclarationNameInfo NameInfo(Name, UsingLoc); |
11099 | TypeSourceInfo *TInfo = |
11100 | Context.getTrivialTypeSourceInfo(BaseCtor->getType(), UsingLoc); |
11101 | FunctionProtoTypeLoc ProtoLoc = |
11102 | TInfo->getTypeLoc().IgnoreParens().castAs<FunctionProtoTypeLoc>(); |
11103 | |
11104 | // Check the inherited constructor is valid and find the list of base classes |
11105 | // from which it was inherited. |
11106 | InheritedConstructorInfo ICI(*this, Loc, Shadow); |
11107 | |
11108 | bool Constexpr = |
11109 | BaseCtor->isConstexpr() && |
11110 | defaultedSpecialMemberIsConstexpr(*this, Derived, CXXDefaultConstructor, |
11111 | false, BaseCtor, &ICI); |
11112 | |
11113 | CXXConstructorDecl *DerivedCtor = CXXConstructorDecl::Create( |
11114 | Context, Derived, UsingLoc, NameInfo, TInfo->getType(), TInfo, |
11115 | BaseCtor->getExplicitSpecifier(), /*Inline=*/true, |
11116 | /*ImplicitlyDeclared=*/true, Constexpr, |
11117 | InheritedConstructor(Shadow, BaseCtor)); |
11118 | if (Shadow->isInvalidDecl()) |
11119 | DerivedCtor->setInvalidDecl(); |
11120 | |
11121 | // Build an unevaluated exception specification for this fake constructor. |
11122 | const FunctionProtoType *FPT = TInfo->getType()->castAs<FunctionProtoType>(); |
11123 | FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); |
11124 | EPI.ExceptionSpec.Type = EST_Unevaluated; |
11125 | EPI.ExceptionSpec.SourceDecl = DerivedCtor; |
11126 | DerivedCtor->setType(Context.getFunctionType(FPT->getReturnType(), |
11127 | FPT->getParamTypes(), EPI)); |
11128 | |
11129 | // Build the parameter declarations. |
11130 | SmallVector<ParmVarDecl *, 16> ParamDecls; |
11131 | for (unsigned I = 0, N = FPT->getNumParams(); I != N; ++I) { |
11132 | TypeSourceInfo *TInfo = |
11133 | Context.getTrivialTypeSourceInfo(FPT->getParamType(I), UsingLoc); |
11134 | ParmVarDecl *PD = ParmVarDecl::Create( |
11135 | Context, DerivedCtor, UsingLoc, UsingLoc, /*IdentifierInfo=*/nullptr, |
11136 | FPT->getParamType(I), TInfo, SC_None, /*DefaultArg=*/nullptr); |
11137 | PD->setScopeInfo(0, I); |
11138 | PD->setImplicit(); |
11139 | // Ensure attributes are propagated onto parameters (this matters for |
11140 | // format, pass_object_size, ...). |
11141 | mergeDeclAttributes(PD, BaseCtor->getParamDecl(I)); |
11142 | ParamDecls.push_back(PD); |
11143 | ProtoLoc.setParam(I, PD); |
11144 | } |
11145 | |
11146 | // Set up the new constructor. |
11147 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11147, __PRETTY_FUNCTION__)); |
11148 | DerivedCtor->setAccess(BaseCtor->getAccess()); |
11149 | DerivedCtor->setParams(ParamDecls); |
11150 | Derived->addDecl(DerivedCtor); |
11151 | |
11152 | if (ShouldDeleteSpecialMember(DerivedCtor, CXXDefaultConstructor, &ICI)) |
11153 | SetDeclDeleted(DerivedCtor, UsingLoc); |
11154 | |
11155 | return DerivedCtor; |
11156 | } |
11157 | |
11158 | void Sema::NoteDeletedInheritingConstructor(CXXConstructorDecl *Ctor) { |
11159 | InheritedConstructorInfo ICI(*this, Ctor->getLocation(), |
11160 | Ctor->getInheritedConstructor().getShadowDecl()); |
11161 | ShouldDeleteSpecialMember(Ctor, CXXDefaultConstructor, &ICI, |
11162 | /*Diagnose*/true); |
11163 | } |
11164 | |
11165 | void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation, |
11166 | CXXConstructorDecl *Constructor) { |
11167 | CXXRecordDecl *ClassDecl = Constructor->getParent(); |
11168 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11170, __PRETTY_FUNCTION__)) |
11169 | !Constructor->doesThisDeclarationHaveABody() &&((Constructor->getInheritedConstructor() && !Constructor ->doesThisDeclarationHaveABody() && !Constructor-> isDeleted()) ? static_cast<void> (0) : __assert_fail ("Constructor->getInheritedConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11170, __PRETTY_FUNCTION__)) |
11170 | !Constructor->isDeleted())((Constructor->getInheritedConstructor() && !Constructor ->doesThisDeclarationHaveABody() && !Constructor-> isDeleted()) ? static_cast<void> (0) : __assert_fail ("Constructor->getInheritedConstructor() && !Constructor->doesThisDeclarationHaveABody() && !Constructor->isDeleted()" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11170, __PRETTY_FUNCTION__)); |
11171 | if (Constructor->willHaveBody() || Constructor->isInvalidDecl()) |
11172 | return; |
11173 | |
11174 | // Initializations are performed "as if by a defaulted default constructor", |
11175 | // so enter the appropriate scope. |
11176 | SynthesizedFunctionScope Scope(*this, Constructor); |
11177 | |
11178 | // The exception specification is needed because we are defining the |
11179 | // function. |
11180 | ResolveExceptionSpec(CurrentLocation, |
11181 | Constructor->getType()->castAs<FunctionProtoType>()); |
11182 | MarkVTableUsed(CurrentLocation, ClassDecl); |
11183 | |
11184 | // Add a context note for diagnostics produced after this point. |
11185 | Scope.addContextNote(CurrentLocation); |
11186 | |
11187 | ConstructorUsingShadowDecl *Shadow = |
11188 | Constructor->getInheritedConstructor().getShadowDecl(); |
11189 | CXXConstructorDecl *InheritedCtor = |
11190 | Constructor->getInheritedConstructor().getConstructor(); |
11191 | |
11192 | // [class.inhctor.init]p1: |
11193 | // initialization proceeds as if a defaulted default constructor is used to |
11194 | // initialize the D object and each base class subobject from which the |
11195 | // constructor was inherited |
11196 | |
11197 | InheritedConstructorInfo ICI(*this, CurrentLocation, Shadow); |
11198 | CXXRecordDecl *RD = Shadow->getParent(); |
11199 | SourceLocation InitLoc = Shadow->getLocation(); |
11200 | |
11201 | // Build explicit initializers for all base classes from which the |
11202 | // constructor was inherited. |
11203 | SmallVector<CXXCtorInitializer*, 8> Inits; |
11204 | for (bool VBase : {false, true}) { |
11205 | for (CXXBaseSpecifier &B : VBase ? RD->vbases() : RD->bases()) { |
11206 | if (B.isVirtual() != VBase) |
11207 | continue; |
11208 | |
11209 | auto *BaseRD = B.getType()->getAsCXXRecordDecl(); |
11210 | if (!BaseRD) |
11211 | continue; |
11212 | |
11213 | auto BaseCtor = ICI.findConstructorForBase(BaseRD, InheritedCtor); |
11214 | if (!BaseCtor.first) |
11215 | continue; |
11216 | |
11217 | MarkFunctionReferenced(CurrentLocation, BaseCtor.first); |
11218 | ExprResult Init = new (Context) CXXInheritedCtorInitExpr( |
11219 | InitLoc, B.getType(), BaseCtor.first, VBase, BaseCtor.second); |
11220 | |
11221 | auto *TInfo = Context.getTrivialTypeSourceInfo(B.getType(), InitLoc); |
11222 | Inits.push_back(new (Context) CXXCtorInitializer( |
11223 | Context, TInfo, VBase, InitLoc, Init.get(), InitLoc, |
11224 | SourceLocation())); |
11225 | } |
11226 | } |
11227 | |
11228 | // We now proceed as if for a defaulted default constructor, with the relevant |
11229 | // initializers replaced. |
11230 | |
11231 | if (SetCtorInitializers(Constructor, /*AnyErrors*/false, Inits)) { |
11232 | Constructor->setInvalidDecl(); |
11233 | return; |
11234 | } |
11235 | |
11236 | Constructor->setBody(new (Context) CompoundStmt(InitLoc)); |
11237 | Constructor->markUsed(Context); |
11238 | |
11239 | if (ASTMutationListener *L = getASTMutationListener()) { |
11240 | L->CompletedImplicitDefinition(Constructor); |
11241 | } |
11242 | |
11243 | DiagnoseUninitializedFields(*this, Constructor); |
11244 | } |
11245 | |
11246 | CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { |
11247 | // C++ [class.dtor]p2: |
11248 | // If a class has no user-declared destructor, a destructor is |
11249 | // declared implicitly. An implicitly-declared destructor is an |
11250 | // inline public member of its class. |
11251 | assert(ClassDecl->needsImplicitDestructor())((ClassDecl->needsImplicitDestructor()) ? static_cast<void > (0) : __assert_fail ("ClassDecl->needsImplicitDestructor()" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11251, __PRETTY_FUNCTION__)); |
11252 | |
11253 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor); |
11254 | if (DSM.isAlreadyBeingDeclared()) |
11255 | return nullptr; |
11256 | |
11257 | // Create the actual destructor declaration. |
11258 | CanQualType ClassType |
11259 | = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); |
11260 | SourceLocation ClassLoc = ClassDecl->getLocation(); |
11261 | DeclarationName Name |
11262 | = Context.DeclarationNames.getCXXDestructorName(ClassType); |
11263 | DeclarationNameInfo NameInfo(Name, ClassLoc); |
11264 | CXXDestructorDecl *Destructor |
11265 | = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, |
11266 | QualType(), nullptr, /*isInline=*/true, |
11267 | /*isImplicitlyDeclared=*/true); |
11268 | Destructor->setAccess(AS_public); |
11269 | Destructor->setDefaulted(); |
11270 | |
11271 | if (getLangOpts().CUDA) { |
11272 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXDestructor, |
11273 | Destructor, |
11274 | /* ConstRHS */ false, |
11275 | /* Diagnose */ false); |
11276 | } |
11277 | |
11278 | setupImplicitSpecialMemberType(Destructor, Context.VoidTy, None); |
11279 | |
11280 | // We don't need to use SpecialMemberIsTrivial here; triviality for |
11281 | // destructors is easy to compute. |
11282 | Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); |
11283 | Destructor->setTrivialForCall(ClassDecl->hasAttr<TrivialABIAttr>() || |
11284 | ClassDecl->hasTrivialDestructorForCall()); |
11285 | |
11286 | // Note that we have declared this destructor. |
11287 | ++getASTContext().NumImplicitDestructorsDeclared; |
11288 | |
11289 | Scope *S = getScopeForContext(ClassDecl); |
11290 | CheckImplicitSpecialMemberDeclaration(S, Destructor); |
11291 | |
11292 | // We can't check whether an implicit destructor is deleted before we complete |
11293 | // the definition of the class, because its validity depends on the alignment |
11294 | // of the class. We'll check this from ActOnFields once the class is complete. |
11295 | if (ClassDecl->isCompleteDefinition() && |
11296 | ShouldDeleteSpecialMember(Destructor, CXXDestructor)) |
11297 | SetDeclDeleted(Destructor, ClassLoc); |
11298 | |
11299 | // Introduce this destructor into its scope. |
11300 | if (S) |
11301 | PushOnScopeChains(Destructor, S, false); |
11302 | ClassDecl->addDecl(Destructor); |
11303 | |
11304 | return Destructor; |
11305 | } |
11306 | |
11307 | void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, |
11308 | CXXDestructorDecl *Destructor) { |
11309 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11312, __PRETTY_FUNCTION__)) |
11310 | !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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11312, __PRETTY_FUNCTION__)) |
11311 | !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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11312, __PRETTY_FUNCTION__)) |
11312 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11312, __PRETTY_FUNCTION__)); |
11313 | if (Destructor->willHaveBody() || Destructor->isInvalidDecl()) |
11314 | return; |
11315 | |
11316 | CXXRecordDecl *ClassDecl = Destructor->getParent(); |
11317 | assert(ClassDecl && "DefineImplicitDestructor - invalid destructor")((ClassDecl && "DefineImplicitDestructor - invalid destructor" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl && \"DefineImplicitDestructor - invalid destructor\"" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11317, __PRETTY_FUNCTION__)); |
11318 | |
11319 | SynthesizedFunctionScope Scope(*this, Destructor); |
11320 | |
11321 | // The exception specification is needed because we are defining the |
11322 | // function. |
11323 | ResolveExceptionSpec(CurrentLocation, |
11324 | Destructor->getType()->castAs<FunctionProtoType>()); |
11325 | MarkVTableUsed(CurrentLocation, ClassDecl); |
11326 | |
11327 | // Add a context note for diagnostics produced after this point. |
11328 | Scope.addContextNote(CurrentLocation); |
11329 | |
11330 | MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), |
11331 | Destructor->getParent()); |
11332 | |
11333 | if (CheckDestructor(Destructor)) { |
11334 | Destructor->setInvalidDecl(); |
11335 | return; |
11336 | } |
11337 | |
11338 | SourceLocation Loc = Destructor->getEndLoc().isValid() |
11339 | ? Destructor->getEndLoc() |
11340 | : Destructor->getLocation(); |
11341 | Destructor->setBody(new (Context) CompoundStmt(Loc)); |
11342 | Destructor->markUsed(Context); |
11343 | |
11344 | if (ASTMutationListener *L = getASTMutationListener()) { |
11345 | L->CompletedImplicitDefinition(Destructor); |
11346 | } |
11347 | } |
11348 | |
11349 | /// Perform any semantic analysis which needs to be delayed until all |
11350 | /// pending class member declarations have been parsed. |
11351 | void Sema::ActOnFinishCXXMemberDecls() { |
11352 | // If the context is an invalid C++ class, just suppress these checks. |
11353 | if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) { |
11354 | if (Record->isInvalidDecl()) { |
11355 | DelayedOverridingExceptionSpecChecks.clear(); |
11356 | DelayedEquivalentExceptionSpecChecks.clear(); |
11357 | return; |
11358 | } |
11359 | checkForMultipleExportedDefaultConstructors(*this, Record); |
11360 | } |
11361 | } |
11362 | |
11363 | void Sema::ActOnFinishCXXNonNestedClass(Decl *D) { |
11364 | referenceDLLExportedClassMethods(); |
11365 | } |
11366 | |
11367 | void Sema::referenceDLLExportedClassMethods() { |
11368 | if (!DelayedDllExportClasses.empty()) { |
11369 | // Calling ReferenceDllExportedMembers might cause the current function to |
11370 | // be called again, so use a local copy of DelayedDllExportClasses. |
11371 | SmallVector<CXXRecordDecl *, 4> WorkList; |
11372 | std::swap(DelayedDllExportClasses, WorkList); |
11373 | for (CXXRecordDecl *Class : WorkList) |
11374 | ReferenceDllExportedMembers(*this, Class); |
11375 | } |
11376 | } |
11377 | |
11378 | void Sema::AdjustDestructorExceptionSpec(CXXDestructorDecl *Destructor) { |
11379 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11380, __PRETTY_FUNCTION__)) |
11380 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11380, __PRETTY_FUNCTION__)); |
11381 | |
11382 | if (Destructor->isDependentContext()) |
11383 | return; |
11384 | |
11385 | // C++11 [class.dtor]p3: |
11386 | // A declaration of a destructor that does not have an exception- |
11387 | // specification is implicitly considered to have the same exception- |
11388 | // specification as an implicit declaration. |
11389 | const FunctionProtoType *DtorType = Destructor->getType()-> |
11390 | getAs<FunctionProtoType>(); |
11391 | if (DtorType->hasExceptionSpec()) |
11392 | return; |
11393 | |
11394 | // Replace the destructor's type, building off the existing one. Fortunately, |
11395 | // the only thing of interest in the destructor type is its extended info. |
11396 | // The return and arguments are fixed. |
11397 | FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); |
11398 | EPI.ExceptionSpec.Type = EST_Unevaluated; |
11399 | EPI.ExceptionSpec.SourceDecl = Destructor; |
11400 | Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); |
11401 | |
11402 | // FIXME: If the destructor has a body that could throw, and the newly created |
11403 | // spec doesn't allow exceptions, we should emit a warning, because this |
11404 | // change in behavior can break conforming C++03 programs at runtime. |
11405 | // However, we don't have a body or an exception specification yet, so it |
11406 | // needs to be done somewhere else. |
11407 | } |
11408 | |
11409 | namespace { |
11410 | /// An abstract base class for all helper classes used in building the |
11411 | // copy/move operators. These classes serve as factory functions and help us |
11412 | // avoid using the same Expr* in the AST twice. |
11413 | class ExprBuilder { |
11414 | ExprBuilder(const ExprBuilder&) = delete; |
11415 | ExprBuilder &operator=(const ExprBuilder&) = delete; |
11416 | |
11417 | protected: |
11418 | static Expr *assertNotNull(Expr *E) { |
11419 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11419, __PRETTY_FUNCTION__)); |
11420 | return E; |
11421 | } |
11422 | |
11423 | public: |
11424 | ExprBuilder() {} |
11425 | virtual ~ExprBuilder() {} |
11426 | |
11427 | virtual Expr *build(Sema &S, SourceLocation Loc) const = 0; |
11428 | }; |
11429 | |
11430 | class RefBuilder: public ExprBuilder { |
11431 | VarDecl *Var; |
11432 | QualType VarType; |
11433 | |
11434 | public: |
11435 | Expr *build(Sema &S, SourceLocation Loc) const override { |
11436 | return assertNotNull(S.BuildDeclRefExpr(Var, VarType, VK_LValue, Loc).get()); |
11437 | } |
11438 | |
11439 | RefBuilder(VarDecl *Var, QualType VarType) |
11440 | : Var(Var), VarType(VarType) {} |
11441 | }; |
11442 | |
11443 | class ThisBuilder: public ExprBuilder { |
11444 | public: |
11445 | Expr *build(Sema &S, SourceLocation Loc) const override { |
11446 | return assertNotNull(S.ActOnCXXThis(Loc).getAs<Expr>()); |
11447 | } |
11448 | }; |
11449 | |
11450 | class CastBuilder: public ExprBuilder { |
11451 | const ExprBuilder &Builder; |
11452 | QualType Type; |
11453 | ExprValueKind Kind; |
11454 | const CXXCastPath &Path; |
11455 | |
11456 | public: |
11457 | Expr *build(Sema &S, SourceLocation Loc) const override { |
11458 | return assertNotNull(S.ImpCastExprToType(Builder.build(S, Loc), Type, |
11459 | CK_UncheckedDerivedToBase, Kind, |
11460 | &Path).get()); |
11461 | } |
11462 | |
11463 | CastBuilder(const ExprBuilder &Builder, QualType Type, ExprValueKind Kind, |
11464 | const CXXCastPath &Path) |
11465 | : Builder(Builder), Type(Type), Kind(Kind), Path(Path) {} |
11466 | }; |
11467 | |
11468 | class DerefBuilder: public ExprBuilder { |
11469 | const ExprBuilder &Builder; |
11470 | |
11471 | public: |
11472 | Expr *build(Sema &S, SourceLocation Loc) const override { |
11473 | return assertNotNull( |
11474 | S.CreateBuiltinUnaryOp(Loc, UO_Deref, Builder.build(S, Loc)).get()); |
11475 | } |
11476 | |
11477 | DerefBuilder(const ExprBuilder &Builder) : Builder(Builder) {} |
11478 | }; |
11479 | |
11480 | class MemberBuilder: public ExprBuilder { |
11481 | const ExprBuilder &Builder; |
11482 | QualType Type; |
11483 | CXXScopeSpec SS; |
11484 | bool IsArrow; |
11485 | LookupResult &MemberLookup; |
11486 | |
11487 | public: |
11488 | Expr *build(Sema &S, SourceLocation Loc) const override { |
11489 | return assertNotNull(S.BuildMemberReferenceExpr( |
11490 | Builder.build(S, Loc), Type, Loc, IsArrow, SS, SourceLocation(), |
11491 | nullptr, MemberLookup, nullptr, nullptr).get()); |
11492 | } |
11493 | |
11494 | MemberBuilder(const ExprBuilder &Builder, QualType Type, bool IsArrow, |
11495 | LookupResult &MemberLookup) |
11496 | : Builder(Builder), Type(Type), IsArrow(IsArrow), |
11497 | MemberLookup(MemberLookup) {} |
11498 | }; |
11499 | |
11500 | class MoveCastBuilder: public ExprBuilder { |
11501 | const ExprBuilder &Builder; |
11502 | |
11503 | public: |
11504 | Expr *build(Sema &S, SourceLocation Loc) const override { |
11505 | return assertNotNull(CastForMoving(S, Builder.build(S, Loc))); |
11506 | } |
11507 | |
11508 | MoveCastBuilder(const ExprBuilder &Builder) : Builder(Builder) {} |
11509 | }; |
11510 | |
11511 | class LvalueConvBuilder: public ExprBuilder { |
11512 | const ExprBuilder &Builder; |
11513 | |
11514 | public: |
11515 | Expr *build(Sema &S, SourceLocation Loc) const override { |
11516 | return assertNotNull( |
11517 | S.DefaultLvalueConversion(Builder.build(S, Loc)).get()); |
11518 | } |
11519 | |
11520 | LvalueConvBuilder(const ExprBuilder &Builder) : Builder(Builder) {} |
11521 | }; |
11522 | |
11523 | class SubscriptBuilder: public ExprBuilder { |
11524 | const ExprBuilder &Base; |
11525 | const ExprBuilder &Index; |
11526 | |
11527 | public: |
11528 | Expr *build(Sema &S, SourceLocation Loc) const override { |
11529 | return assertNotNull(S.CreateBuiltinArraySubscriptExpr( |
11530 | Base.build(S, Loc), Loc, Index.build(S, Loc), Loc).get()); |
11531 | } |
11532 | |
11533 | SubscriptBuilder(const ExprBuilder &Base, const ExprBuilder &Index) |
11534 | : Base(Base), Index(Index) {} |
11535 | }; |
11536 | |
11537 | } // end anonymous namespace |
11538 | |
11539 | /// When generating a defaulted copy or move assignment operator, if a field |
11540 | /// should be copied with __builtin_memcpy rather than via explicit assignments, |
11541 | /// do so. This optimization only applies for arrays of scalars, and for arrays |
11542 | /// of class type where the selected copy/move-assignment operator is trivial. |
11543 | static StmtResult |
11544 | buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, |
11545 | const ExprBuilder &ToB, const ExprBuilder &FromB) { |
11546 | // Compute the size of the memory buffer to be copied. |
11547 | QualType SizeType = S.Context.getSizeType(); |
11548 | llvm::APInt Size(S.Context.getTypeSize(SizeType), |
11549 | S.Context.getTypeSizeInChars(T).getQuantity()); |
11550 | |
11551 | // Take the address of the field references for "from" and "to". We |
11552 | // directly construct UnaryOperators here because semantic analysis |
11553 | // does not permit us to take the address of an xvalue. |
11554 | Expr *From = FromB.build(S, Loc); |
11555 | From = new (S.Context) UnaryOperator(From, UO_AddrOf, |
11556 | S.Context.getPointerType(From->getType()), |
11557 | VK_RValue, OK_Ordinary, Loc, false); |
11558 | Expr *To = ToB.build(S, Loc); |
11559 | To = new (S.Context) UnaryOperator(To, UO_AddrOf, |
11560 | S.Context.getPointerType(To->getType()), |
11561 | VK_RValue, OK_Ordinary, Loc, false); |
11562 | |
11563 | const Type *E = T->getBaseElementTypeUnsafe(); |
11564 | bool NeedsCollectableMemCpy = |
11565 | E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember(); |
11566 | |
11567 | // Create a reference to the __builtin_objc_memmove_collectable function |
11568 | StringRef MemCpyName = NeedsCollectableMemCpy ? |
11569 | "__builtin_objc_memmove_collectable" : |
11570 | "__builtin_memcpy"; |
11571 | LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc, |
11572 | Sema::LookupOrdinaryName); |
11573 | S.LookupName(R, S.TUScope, true); |
11574 | |
11575 | FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>(); |
11576 | if (!MemCpy) |
11577 | // Something went horribly wrong earlier, and we will have complained |
11578 | // about it. |
11579 | return StmtError(); |
11580 | |
11581 | ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy, |
11582 | VK_RValue, Loc, nullptr); |
11583 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11583, __PRETTY_FUNCTION__)); |
11584 | |
11585 | Expr *CallArgs[] = { |
11586 | To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc) |
11587 | }; |
11588 | ExprResult Call = S.BuildCallExpr(/*Scope=*/nullptr, MemCpyRef.get(), |
11589 | Loc, CallArgs, Loc); |
11590 | |
11591 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11591, __PRETTY_FUNCTION__)); |
11592 | return Call.getAs<Stmt>(); |
11593 | } |
11594 | |
11595 | /// Builds a statement that copies/moves the given entity from \p From to |
11596 | /// \c To. |
11597 | /// |
11598 | /// This routine is used to copy/move the members of a class with an |
11599 | /// implicitly-declared copy/move assignment operator. When the entities being |
11600 | /// copied are arrays, this routine builds for loops to copy them. |
11601 | /// |
11602 | /// \param S The Sema object used for type-checking. |
11603 | /// |
11604 | /// \param Loc The location where the implicit copy/move is being generated. |
11605 | /// |
11606 | /// \param T The type of the expressions being copied/moved. Both expressions |
11607 | /// must have this type. |
11608 | /// |
11609 | /// \param To The expression we are copying/moving to. |
11610 | /// |
11611 | /// \param From The expression we are copying/moving from. |
11612 | /// |
11613 | /// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. |
11614 | /// Otherwise, it's a non-static member subobject. |
11615 | /// |
11616 | /// \param Copying Whether we're copying or moving. |
11617 | /// |
11618 | /// \param Depth Internal parameter recording the depth of the recursion. |
11619 | /// |
11620 | /// \returns A statement or a loop that copies the expressions, or StmtResult(0) |
11621 | /// if a memcpy should be used instead. |
11622 | static StmtResult |
11623 | buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, |
11624 | const ExprBuilder &To, const ExprBuilder &From, |
11625 | bool CopyingBaseSubobject, bool Copying, |
11626 | unsigned Depth = 0) { |
11627 | // C++11 [class.copy]p28: |
11628 | // Each subobject is assigned in the manner appropriate to its type: |
11629 | // |
11630 | // - if the subobject is of class type, as if by a call to operator= with |
11631 | // the subobject as the object expression and the corresponding |
11632 | // subobject of x as a single function argument (as if by explicit |
11633 | // qualification; that is, ignoring any possible virtual overriding |
11634 | // functions in more derived classes); |
11635 | // |
11636 | // C++03 [class.copy]p13: |
11637 | // - if the subobject is of class type, the copy assignment operator for |
11638 | // the class is used (as if by explicit qualification; that is, |
11639 | // ignoring any possible virtual overriding functions in more derived |
11640 | // classes); |
11641 | if (const RecordType *RecordTy = T->getAs<RecordType>()) { |
11642 | CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); |
11643 | |
11644 | // Look for operator=. |
11645 | DeclarationName Name |
11646 | = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); |
11647 | LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); |
11648 | S.LookupQualifiedName(OpLookup, ClassDecl, false); |
11649 | |
11650 | // Prior to C++11, filter out any result that isn't a copy/move-assignment |
11651 | // operator. |
11652 | if (!S.getLangOpts().CPlusPlus11) { |
11653 | LookupResult::Filter F = OpLookup.makeFilter(); |
11654 | while (F.hasNext()) { |
11655 | NamedDecl *D = F.next(); |
11656 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) |
11657 | if (Method->isCopyAssignmentOperator() || |
11658 | (!Copying && Method->isMoveAssignmentOperator())) |
11659 | continue; |
11660 | |
11661 | F.erase(); |
11662 | } |
11663 | F.done(); |
11664 | } |
11665 | |
11666 | // Suppress the protected check (C++ [class.protected]) for each of the |
11667 | // assignment operators we found. This strange dance is required when |
11668 | // we're assigning via a base classes's copy-assignment operator. To |
11669 | // ensure that we're getting the right base class subobject (without |
11670 | // ambiguities), we need to cast "this" to that subobject type; to |
11671 | // ensure that we don't go through the virtual call mechanism, we need |
11672 | // to qualify the operator= name with the base class (see below). However, |
11673 | // this means that if the base class has a protected copy assignment |
11674 | // operator, the protected member access check will fail. So, we |
11675 | // rewrite "protected" access to "public" access in this case, since we |
11676 | // know by construction that we're calling from a derived class. |
11677 | if (CopyingBaseSubobject) { |
11678 | for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); |
11679 | L != LEnd; ++L) { |
11680 | if (L.getAccess() == AS_protected) |
11681 | L.setAccess(AS_public); |
11682 | } |
11683 | } |
11684 | |
11685 | // Create the nested-name-specifier that will be used to qualify the |
11686 | // reference to operator=; this is required to suppress the virtual |
11687 | // call mechanism. |
11688 | CXXScopeSpec SS; |
11689 | const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); |
11690 | SS.MakeTrivial(S.Context, |
11691 | NestedNameSpecifier::Create(S.Context, nullptr, false, |
11692 | CanonicalT), |
11693 | Loc); |
11694 | |
11695 | // Create the reference to operator=. |
11696 | ExprResult OpEqualRef |
11697 | = S.BuildMemberReferenceExpr(To.build(S, Loc), T, Loc, /*isArrow=*/false, |
11698 | SS, /*TemplateKWLoc=*/SourceLocation(), |
11699 | /*FirstQualifierInScope=*/nullptr, |
11700 | OpLookup, |
11701 | /*TemplateArgs=*/nullptr, /*S*/nullptr, |
11702 | /*SuppressQualifierCheck=*/true); |
11703 | if (OpEqualRef.isInvalid()) |
11704 | return StmtError(); |
11705 | |
11706 | // Build the call to the assignment operator. |
11707 | |
11708 | Expr *FromInst = From.build(S, Loc); |
11709 | ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/nullptr, |
11710 | OpEqualRef.getAs<Expr>(), |
11711 | Loc, FromInst, Loc); |
11712 | if (Call.isInvalid()) |
11713 | return StmtError(); |
11714 | |
11715 | // If we built a call to a trivial 'operator=' while copying an array, |
11716 | // bail out. We'll replace the whole shebang with a memcpy. |
11717 | CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get()); |
11718 | if (CE && CE->getMethodDecl()->isTrivial() && Depth) |
11719 | return StmtResult((Stmt*)nullptr); |
11720 | |
11721 | // Convert to an expression-statement, and clean up any produced |
11722 | // temporaries. |
11723 | return S.ActOnExprStmt(Call); |
11724 | } |
11725 | |
11726 | // - if the subobject is of scalar type, the built-in assignment |
11727 | // operator is used. |
11728 | const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); |
11729 | if (!ArrayTy) { |
11730 | ExprResult Assignment = S.CreateBuiltinBinOp( |
11731 | Loc, BO_Assign, To.build(S, Loc), From.build(S, Loc)); |
11732 | if (Assignment.isInvalid()) |
11733 | return StmtError(); |
11734 | return S.ActOnExprStmt(Assignment); |
11735 | } |
11736 | |
11737 | // - if the subobject is an array, each element is assigned, in the |
11738 | // manner appropriate to the element type; |
11739 | |
11740 | // Construct a loop over the array bounds, e.g., |
11741 | // |
11742 | // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) |
11743 | // |
11744 | // that will copy each of the array elements. |
11745 | QualType SizeType = S.Context.getSizeType(); |
11746 | |
11747 | // Create the iteration variable. |
11748 | IdentifierInfo *IterationVarName = nullptr; |
11749 | { |
11750 | SmallString<8> Str; |
11751 | llvm::raw_svector_ostream OS(Str); |
11752 | OS << "__i" << Depth; |
11753 | IterationVarName = &S.Context.Idents.get(OS.str()); |
11754 | } |
11755 | VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, |
11756 | IterationVarName, SizeType, |
11757 | S.Context.getTrivialTypeSourceInfo(SizeType, Loc), |
11758 | SC_None); |
11759 | |
11760 | // Initialize the iteration variable to zero. |
11761 | llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); |
11762 | IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); |
11763 | |
11764 | // Creates a reference to the iteration variable. |
11765 | RefBuilder IterationVarRef(IterationVar, SizeType); |
11766 | LvalueConvBuilder IterationVarRefRVal(IterationVarRef); |
11767 | |
11768 | // Create the DeclStmt that holds the iteration variable. |
11769 | Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); |
11770 | |
11771 | // Subscript the "from" and "to" expressions with the iteration variable. |
11772 | SubscriptBuilder FromIndexCopy(From, IterationVarRefRVal); |
11773 | MoveCastBuilder FromIndexMove(FromIndexCopy); |
11774 | const ExprBuilder *FromIndex; |
11775 | if (Copying) |
11776 | FromIndex = &FromIndexCopy; |
11777 | else |
11778 | FromIndex = &FromIndexMove; |
11779 | |
11780 | SubscriptBuilder ToIndex(To, IterationVarRefRVal); |
11781 | |
11782 | // Build the copy/move for an individual element of the array. |
11783 | StmtResult Copy = |
11784 | buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(), |
11785 | ToIndex, *FromIndex, CopyingBaseSubobject, |
11786 | Copying, Depth + 1); |
11787 | // Bail out if copying fails or if we determined that we should use memcpy. |
11788 | if (Copy.isInvalid() || !Copy.get()) |
11789 | return Copy; |
11790 | |
11791 | // Create the comparison against the array bound. |
11792 | llvm::APInt Upper |
11793 | = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); |
11794 | Expr *Comparison |
11795 | = new (S.Context) BinaryOperator(IterationVarRefRVal.build(S, Loc), |
11796 | IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), |
11797 | BO_NE, S.Context.BoolTy, |
11798 | VK_RValue, OK_Ordinary, Loc, FPOptions()); |
11799 | |
11800 | // Create the pre-increment of the iteration variable. We can determine |
11801 | // whether the increment will overflow based on the value of the array |
11802 | // bound. |
11803 | Expr *Increment = new (S.Context) |
11804 | UnaryOperator(IterationVarRef.build(S, Loc), UO_PreInc, SizeType, |
11805 | VK_LValue, OK_Ordinary, Loc, Upper.isMaxValue()); |
11806 | |
11807 | // Construct the loop that copies all elements of this array. |
11808 | return S.ActOnForStmt( |
11809 | Loc, Loc, InitStmt, |
11810 | S.ActOnCondition(nullptr, Loc, Comparison, Sema::ConditionKind::Boolean), |
11811 | S.MakeFullDiscardedValueExpr(Increment), Loc, Copy.get()); |
11812 | } |
11813 | |
11814 | static StmtResult |
11815 | buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, |
11816 | const ExprBuilder &To, const ExprBuilder &From, |
11817 | bool CopyingBaseSubobject, bool Copying) { |
11818 | // Maybe we should use a memcpy? |
11819 | if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() && |
11820 | T.isTriviallyCopyableType(S.Context)) |
11821 | return buildMemcpyForAssignmentOp(S, Loc, T, To, From); |
11822 | |
11823 | StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From, |
11824 | CopyingBaseSubobject, |
11825 | Copying, 0)); |
11826 | |
11827 | // If we ended up picking a trivial assignment operator for an array of a |
11828 | // non-trivially-copyable class type, just emit a memcpy. |
11829 | if (!Result.isInvalid() && !Result.get()) |
11830 | return buildMemcpyForAssignmentOp(S, Loc, T, To, From); |
11831 | |
11832 | return Result; |
11833 | } |
11834 | |
11835 | CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { |
11836 | // Note: The following rules are largely analoguous to the copy |
11837 | // constructor rules. Note that virtual bases are not taken into account |
11838 | // for determining the argument type of the operator. Note also that |
11839 | // operators taking an object instead of a reference are allowed. |
11840 | assert(ClassDecl->needsImplicitCopyAssignment())((ClassDecl->needsImplicitCopyAssignment()) ? static_cast< void> (0) : __assert_fail ("ClassDecl->needsImplicitCopyAssignment()" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11840, __PRETTY_FUNCTION__)); |
11841 | |
11842 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment); |
11843 | if (DSM.isAlreadyBeingDeclared()) |
11844 | return nullptr; |
11845 | |
11846 | QualType ArgType = Context.getTypeDeclType(ClassDecl); |
11847 | if (Context.getLangOpts().OpenCLCPlusPlus) |
11848 | ArgType = Context.getAddrSpaceQualType(ArgType, LangAS::opencl_generic); |
11849 | QualType RetType = Context.getLValueReferenceType(ArgType); |
11850 | bool Const = ClassDecl->implicitCopyAssignmentHasConstParam(); |
11851 | if (Const) |
11852 | ArgType = ArgType.withConst(); |
11853 | |
11854 | ArgType = Context.getLValueReferenceType(ArgType); |
11855 | |
11856 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, |
11857 | CXXCopyAssignment, |
11858 | Const); |
11859 | |
11860 | // An implicitly-declared copy assignment operator is an inline public |
11861 | // member of its class. |
11862 | DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); |
11863 | SourceLocation ClassLoc = ClassDecl->getLocation(); |
11864 | DeclarationNameInfo NameInfo(Name, ClassLoc); |
11865 | CXXMethodDecl *CopyAssignment = |
11866 | CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), |
11867 | /*TInfo=*/nullptr, /*StorageClass=*/SC_None, |
11868 | /*isInline=*/true, Constexpr, SourceLocation()); |
11869 | CopyAssignment->setAccess(AS_public); |
11870 | CopyAssignment->setDefaulted(); |
11871 | CopyAssignment->setImplicit(); |
11872 | |
11873 | if (getLangOpts().CUDA) { |
11874 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXCopyAssignment, |
11875 | CopyAssignment, |
11876 | /* ConstRHS */ Const, |
11877 | /* Diagnose */ false); |
11878 | } |
11879 | |
11880 | setupImplicitSpecialMemberType(CopyAssignment, RetType, ArgType); |
11881 | |
11882 | // Add the parameter to the operator. |
11883 | ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, |
11884 | ClassLoc, ClassLoc, |
11885 | /*Id=*/nullptr, ArgType, |
11886 | /*TInfo=*/nullptr, SC_None, |
11887 | nullptr); |
11888 | CopyAssignment->setParams(FromParam); |
11889 | |
11890 | CopyAssignment->setTrivial( |
11891 | ClassDecl->needsOverloadResolutionForCopyAssignment() |
11892 | ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment) |
11893 | : ClassDecl->hasTrivialCopyAssignment()); |
11894 | |
11895 | // Note that we have added this copy-assignment operator. |
11896 | ++getASTContext().NumImplicitCopyAssignmentOperatorsDeclared; |
11897 | |
11898 | Scope *S = getScopeForContext(ClassDecl); |
11899 | CheckImplicitSpecialMemberDeclaration(S, CopyAssignment); |
11900 | |
11901 | if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) |
11902 | SetDeclDeleted(CopyAssignment, ClassLoc); |
11903 | |
11904 | if (S) |
11905 | PushOnScopeChains(CopyAssignment, S, false); |
11906 | ClassDecl->addDecl(CopyAssignment); |
11907 | |
11908 | return CopyAssignment; |
11909 | } |
11910 | |
11911 | /// Diagnose an implicit copy operation for a class which is odr-used, but |
11912 | /// which is deprecated because the class has a user-declared copy constructor, |
11913 | /// copy assignment operator, or destructor. |
11914 | static void diagnoseDeprecatedCopyOperation(Sema &S, CXXMethodDecl *CopyOp) { |
11915 | assert(CopyOp->isImplicit())((CopyOp->isImplicit()) ? static_cast<void> (0) : __assert_fail ("CopyOp->isImplicit()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11915, __PRETTY_FUNCTION__)); |
11916 | |
11917 | CXXRecordDecl *RD = CopyOp->getParent(); |
11918 | CXXMethodDecl *UserDeclaredOperation = nullptr; |
11919 | |
11920 | // In Microsoft mode, assignment operations don't affect constructors and |
11921 | // vice versa. |
11922 | if (RD->hasUserDeclaredDestructor()) { |
11923 | UserDeclaredOperation = RD->getDestructor(); |
11924 | } else if (!isa<CXXConstructorDecl>(CopyOp) && |
11925 | RD->hasUserDeclaredCopyConstructor() && |
11926 | !S.getLangOpts().MSVCCompat) { |
11927 | // Find any user-declared copy constructor. |
11928 | for (auto *I : RD->ctors()) { |
11929 | if (I->isCopyConstructor()) { |
11930 | UserDeclaredOperation = I; |
11931 | break; |
11932 | } |
11933 | } |
11934 | assert(UserDeclaredOperation)((UserDeclaredOperation) ? static_cast<void> (0) : __assert_fail ("UserDeclaredOperation", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11934, __PRETTY_FUNCTION__)); |
11935 | } else if (isa<CXXConstructorDecl>(CopyOp) && |
11936 | RD->hasUserDeclaredCopyAssignment() && |
11937 | !S.getLangOpts().MSVCCompat) { |
11938 | // Find any user-declared move assignment operator. |
11939 | for (auto *I : RD->methods()) { |
11940 | if (I->isCopyAssignmentOperator()) { |
11941 | UserDeclaredOperation = I; |
11942 | break; |
11943 | } |
11944 | } |
11945 | assert(UserDeclaredOperation)((UserDeclaredOperation) ? static_cast<void> (0) : __assert_fail ("UserDeclaredOperation", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11945, __PRETTY_FUNCTION__)); |
11946 | } |
11947 | |
11948 | if (UserDeclaredOperation) { |
11949 | S.Diag(UserDeclaredOperation->getLocation(), |
11950 | diag::warn_deprecated_copy_operation) |
11951 | << RD << /*copy assignment*/!isa<CXXConstructorDecl>(CopyOp) |
11952 | << /*destructor*/isa<CXXDestructorDecl>(UserDeclaredOperation); |
11953 | } |
11954 | } |
11955 | |
11956 | void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, |
11957 | CXXMethodDecl *CopyAssignOperator) { |
11958 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11963, __PRETTY_FUNCTION__)) |
11959 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11963, __PRETTY_FUNCTION__)) |
11960 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11963, __PRETTY_FUNCTION__)) |
11961 | !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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11963, __PRETTY_FUNCTION__)) |
11962 | !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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11963, __PRETTY_FUNCTION__)) |
11963 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 11963, __PRETTY_FUNCTION__)); |
11964 | if (CopyAssignOperator->willHaveBody() || CopyAssignOperator->isInvalidDecl()) |
11965 | return; |
11966 | |
11967 | CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); |
11968 | if (ClassDecl->isInvalidDecl()) { |
11969 | CopyAssignOperator->setInvalidDecl(); |
11970 | return; |
11971 | } |
11972 | |
11973 | SynthesizedFunctionScope Scope(*this, CopyAssignOperator); |
11974 | |
11975 | // The exception specification is needed because we are defining the |
11976 | // function. |
11977 | ResolveExceptionSpec(CurrentLocation, |
11978 | CopyAssignOperator->getType()->castAs<FunctionProtoType>()); |
11979 | |
11980 | // Add a context note for diagnostics produced after this point. |
11981 | Scope.addContextNote(CurrentLocation); |
11982 | |
11983 | // C++11 [class.copy]p18: |
11984 | // The [definition of an implicitly declared copy assignment operator] is |
11985 | // deprecated if the class has a user-declared copy constructor or a |
11986 | // user-declared destructor. |
11987 | if (getLangOpts().CPlusPlus11 && CopyAssignOperator->isImplicit()) |
11988 | diagnoseDeprecatedCopyOperation(*this, CopyAssignOperator); |
11989 | |
11990 | // C++0x [class.copy]p30: |
11991 | // The implicitly-defined or explicitly-defaulted copy assignment operator |
11992 | // for a non-union class X performs memberwise copy assignment of its |
11993 | // subobjects. The direct base classes of X are assigned first, in the |
11994 | // order of their declaration in the base-specifier-list, and then the |
11995 | // immediate non-static data members of X are assigned, in the order in |
11996 | // which they were declared in the class definition. |
11997 | |
11998 | // The statements that form the synthesized function body. |
11999 | SmallVector<Stmt*, 8> Statements; |
12000 | |
12001 | // The parameter for the "other" object, which we are copying from. |
12002 | ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); |
12003 | Qualifiers OtherQuals = Other->getType().getQualifiers(); |
12004 | QualType OtherRefType = Other->getType(); |
12005 | if (const LValueReferenceType *OtherRef |
12006 | = OtherRefType->getAs<LValueReferenceType>()) { |
12007 | OtherRefType = OtherRef->getPointeeType(); |
12008 | OtherQuals = OtherRefType.getQualifiers(); |
12009 | } |
12010 | |
12011 | // Our location for everything implicitly-generated. |
12012 | SourceLocation Loc = CopyAssignOperator->getEndLoc().isValid() |
12013 | ? CopyAssignOperator->getEndLoc() |
12014 | : CopyAssignOperator->getLocation(); |
12015 | |
12016 | // Builds a DeclRefExpr for the "other" object. |
12017 | RefBuilder OtherRef(Other, OtherRefType); |
12018 | |
12019 | // Builds the "this" pointer. |
12020 | ThisBuilder This; |
12021 | |
12022 | // Assign base classes. |
12023 | bool Invalid = false; |
12024 | for (auto &Base : ClassDecl->bases()) { |
12025 | // Form the assignment: |
12026 | // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); |
12027 | QualType BaseType = Base.getType().getUnqualifiedType(); |
12028 | if (!BaseType->isRecordType()) { |
12029 | Invalid = true; |
12030 | continue; |
12031 | } |
12032 | |
12033 | CXXCastPath BasePath; |
12034 | BasePath.push_back(&Base); |
12035 | |
12036 | // Construct the "from" expression, which is an implicit cast to the |
12037 | // appropriately-qualified base type. |
12038 | CastBuilder From(OtherRef, Context.getQualifiedType(BaseType, OtherQuals), |
12039 | VK_LValue, BasePath); |
12040 | |
12041 | // Dereference "this". |
12042 | DerefBuilder DerefThis(This); |
12043 | CastBuilder To(DerefThis, |
12044 | Context.getQualifiedType( |
12045 | BaseType, CopyAssignOperator->getMethodQualifiers()), |
12046 | VK_LValue, BasePath); |
12047 | |
12048 | // Build the copy. |
12049 | StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType, |
12050 | To, From, |
12051 | /*CopyingBaseSubobject=*/true, |
12052 | /*Copying=*/true); |
12053 | if (Copy.isInvalid()) { |
12054 | CopyAssignOperator->setInvalidDecl(); |
12055 | return; |
12056 | } |
12057 | |
12058 | // Success! Record the copy. |
12059 | Statements.push_back(Copy.getAs<Expr>()); |
12060 | } |
12061 | |
12062 | // Assign non-static members. |
12063 | for (auto *Field : ClassDecl->fields()) { |
12064 | // FIXME: We should form some kind of AST representation for the implied |
12065 | // memcpy in a union copy operation. |
12066 | if (Field->isUnnamedBitfield() || Field->getParent()->isUnion()) |
12067 | continue; |
12068 | |
12069 | if (Field->isInvalidDecl()) { |
12070 | Invalid = true; |
12071 | continue; |
12072 | } |
12073 | |
12074 | // Check for members of reference type; we can't copy those. |
12075 | if (Field->getType()->isReferenceType()) { |
12076 | Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) |
12077 | << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); |
12078 | Diag(Field->getLocation(), diag::note_declared_at); |
12079 | Invalid = true; |
12080 | continue; |
12081 | } |
12082 | |
12083 | // Check for members of const-qualified, non-class type. |
12084 | QualType BaseType = Context.getBaseElementType(Field->getType()); |
12085 | if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { |
12086 | Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) |
12087 | << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); |
12088 | Diag(Field->getLocation(), diag::note_declared_at); |
12089 | Invalid = true; |
12090 | continue; |
12091 | } |
12092 | |
12093 | // Suppress assigning zero-width bitfields. |
12094 | if (Field->isZeroLengthBitField(Context)) |
12095 | continue; |
12096 | |
12097 | QualType FieldType = Field->getType().getNonReferenceType(); |
12098 | if (FieldType->isIncompleteArrayType()) { |
12099 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12100, __PRETTY_FUNCTION__)) |
12100 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12100, __PRETTY_FUNCTION__)); |
12101 | continue; |
12102 | } |
12103 | |
12104 | // Build references to the field in the object we're copying from and to. |
12105 | CXXScopeSpec SS; // Intentionally empty |
12106 | LookupResult MemberLookup(*this, Field->getDeclName(), Loc, |
12107 | LookupMemberName); |
12108 | MemberLookup.addDecl(Field); |
12109 | MemberLookup.resolveKind(); |
12110 | |
12111 | MemberBuilder From(OtherRef, OtherRefType, /*IsArrow=*/false, MemberLookup); |
12112 | |
12113 | MemberBuilder To(This, getCurrentThisType(), /*IsArrow=*/true, MemberLookup); |
12114 | |
12115 | // Build the copy of this field. |
12116 | StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType, |
12117 | To, From, |
12118 | /*CopyingBaseSubobject=*/false, |
12119 | /*Copying=*/true); |
12120 | if (Copy.isInvalid()) { |
12121 | CopyAssignOperator->setInvalidDecl(); |
12122 | return; |
12123 | } |
12124 | |
12125 | // Success! Record the copy. |
12126 | Statements.push_back(Copy.getAs<Stmt>()); |
12127 | } |
12128 | |
12129 | if (!Invalid) { |
12130 | // Add a "return *this;" |
12131 | ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc)); |
12132 | |
12133 | StmtResult Return = BuildReturnStmt(Loc, ThisObj.get()); |
12134 | if (Return.isInvalid()) |
12135 | Invalid = true; |
12136 | else |
12137 | Statements.push_back(Return.getAs<Stmt>()); |
12138 | } |
12139 | |
12140 | if (Invalid) { |
12141 | CopyAssignOperator->setInvalidDecl(); |
12142 | return; |
12143 | } |
12144 | |
12145 | StmtResult Body; |
12146 | { |
12147 | CompoundScopeRAII CompoundScope(*this); |
12148 | Body = ActOnCompoundStmt(Loc, Loc, Statements, |
12149 | /*isStmtExpr=*/false); |
12150 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12150, __PRETTY_FUNCTION__)); |
12151 | } |
12152 | CopyAssignOperator->setBody(Body.getAs<Stmt>()); |
12153 | CopyAssignOperator->markUsed(Context); |
12154 | |
12155 | if (ASTMutationListener *L = getASTMutationListener()) { |
12156 | L->CompletedImplicitDefinition(CopyAssignOperator); |
12157 | } |
12158 | } |
12159 | |
12160 | CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { |
12161 | assert(ClassDecl->needsImplicitMoveAssignment())((ClassDecl->needsImplicitMoveAssignment()) ? static_cast< void> (0) : __assert_fail ("ClassDecl->needsImplicitMoveAssignment()" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12161, __PRETTY_FUNCTION__)); |
12162 | |
12163 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment); |
12164 | if (DSM.isAlreadyBeingDeclared()) |
12165 | return nullptr; |
12166 | |
12167 | // Note: The following rules are largely analoguous to the move |
12168 | // constructor rules. |
12169 | |
12170 | QualType ArgType = Context.getTypeDeclType(ClassDecl); |
12171 | if (Context.getLangOpts().OpenCLCPlusPlus) |
12172 | ArgType = Context.getAddrSpaceQualType(ArgType, LangAS::opencl_generic); |
12173 | QualType RetType = Context.getLValueReferenceType(ArgType); |
12174 | ArgType = Context.getRValueReferenceType(ArgType); |
12175 | |
12176 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, |
12177 | CXXMoveAssignment, |
12178 | false); |
12179 | |
12180 | // An implicitly-declared move assignment operator is an inline public |
12181 | // member of its class. |
12182 | DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); |
12183 | SourceLocation ClassLoc = ClassDecl->getLocation(); |
12184 | DeclarationNameInfo NameInfo(Name, ClassLoc); |
12185 | CXXMethodDecl *MoveAssignment = |
12186 | CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), |
12187 | /*TInfo=*/nullptr, /*StorageClass=*/SC_None, |
12188 | /*isInline=*/true, Constexpr, SourceLocation()); |
12189 | MoveAssignment->setAccess(AS_public); |
12190 | MoveAssignment->setDefaulted(); |
12191 | MoveAssignment->setImplicit(); |
12192 | |
12193 | if (getLangOpts().CUDA) { |
12194 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXMoveAssignment, |
12195 | MoveAssignment, |
12196 | /* ConstRHS */ false, |
12197 | /* Diagnose */ false); |
12198 | } |
12199 | |
12200 | // Build an exception specification pointing back at this member. |
12201 | FunctionProtoType::ExtProtoInfo EPI = |
12202 | getImplicitMethodEPI(*this, MoveAssignment); |
12203 | MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); |
12204 | |
12205 | // Add the parameter to the operator. |
12206 | ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, |
12207 | ClassLoc, ClassLoc, |
12208 | /*Id=*/nullptr, ArgType, |
12209 | /*TInfo=*/nullptr, SC_None, |
12210 | nullptr); |
12211 | MoveAssignment->setParams(FromParam); |
12212 | |
12213 | MoveAssignment->setTrivial( |
12214 | ClassDecl->needsOverloadResolutionForMoveAssignment() |
12215 | ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment) |
12216 | : ClassDecl->hasTrivialMoveAssignment()); |
12217 | |
12218 | // Note that we have added this copy-assignment operator. |
12219 | ++getASTContext().NumImplicitMoveAssignmentOperatorsDeclared; |
12220 | |
12221 | Scope *S = getScopeForContext(ClassDecl); |
12222 | CheckImplicitSpecialMemberDeclaration(S, MoveAssignment); |
12223 | |
12224 | if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { |
12225 | ClassDecl->setImplicitMoveAssignmentIsDeleted(); |
12226 | SetDeclDeleted(MoveAssignment, ClassLoc); |
12227 | } |
12228 | |
12229 | if (S) |
12230 | PushOnScopeChains(MoveAssignment, S, false); |
12231 | ClassDecl->addDecl(MoveAssignment); |
12232 | |
12233 | return MoveAssignment; |
12234 | } |
12235 | |
12236 | /// Check if we're implicitly defining a move assignment operator for a class |
12237 | /// with virtual bases. Such a move assignment might move-assign the virtual |
12238 | /// base multiple times. |
12239 | static void checkMoveAssignmentForRepeatedMove(Sema &S, CXXRecordDecl *Class, |
12240 | SourceLocation CurrentLocation) { |
12241 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12241, __PRETTY_FUNCTION__)); |
12242 | |
12243 | // Only a virtual base could get implicitly move-assigned multiple times. |
12244 | // Only a non-trivial move assignment can observe this. We only want to |
12245 | // diagnose if we implicitly define an assignment operator that assigns |
12246 | // two base classes, both of which move-assign the same virtual base. |
12247 | if (Class->getNumVBases() == 0 || Class->hasTrivialMoveAssignment() || |
12248 | Class->getNumBases() < 2) |
12249 | return; |
12250 | |
12251 | llvm::SmallVector<CXXBaseSpecifier *, 16> Worklist; |
12252 | typedef llvm::DenseMap<CXXRecordDecl*, CXXBaseSpecifier*> VBaseMap; |
12253 | VBaseMap VBases; |
12254 | |
12255 | for (auto &BI : Class->bases()) { |
12256 | Worklist.push_back(&BI); |
12257 | while (!Worklist.empty()) { |
12258 | CXXBaseSpecifier *BaseSpec = Worklist.pop_back_val(); |
12259 | CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl(); |
12260 | |
12261 | // If the base has no non-trivial move assignment operators, |
12262 | // we don't care about moves from it. |
12263 | if (!Base->hasNonTrivialMoveAssignment()) |
12264 | continue; |
12265 | |
12266 | // If there's nothing virtual here, skip it. |
12267 | if (!BaseSpec->isVirtual() && !Base->getNumVBases()) |
12268 | continue; |
12269 | |
12270 | // If we're not actually going to call a move assignment for this base, |
12271 | // or the selected move assignment is trivial, skip it. |
12272 | Sema::SpecialMemberOverloadResult SMOR = |
12273 | S.LookupSpecialMember(Base, Sema::CXXMoveAssignment, |
12274 | /*ConstArg*/false, /*VolatileArg*/false, |
12275 | /*RValueThis*/true, /*ConstThis*/false, |
12276 | /*VolatileThis*/false); |
12277 | if (!SMOR.getMethod() || SMOR.getMethod()->isTrivial() || |
12278 | !SMOR.getMethod()->isMoveAssignmentOperator()) |
12279 | continue; |
12280 | |
12281 | if (BaseSpec->isVirtual()) { |
12282 | // We're going to move-assign this virtual base, and its move |
12283 | // assignment operator is not trivial. If this can happen for |
12284 | // multiple distinct direct bases of Class, diagnose it. (If it |
12285 | // only happens in one base, we'll diagnose it when synthesizing |
12286 | // that base class's move assignment operator.) |
12287 | CXXBaseSpecifier *&Existing = |
12288 | VBases.insert(std::make_pair(Base->getCanonicalDecl(), &BI)) |
12289 | .first->second; |
12290 | if (Existing && Existing != &BI) { |
12291 | S.Diag(CurrentLocation, diag::warn_vbase_moved_multiple_times) |
12292 | << Class << Base; |
12293 | S.Diag(Existing->getBeginLoc(), diag::note_vbase_moved_here) |
12294 | << (Base->getCanonicalDecl() == |
12295 | Existing->getType()->getAsCXXRecordDecl()->getCanonicalDecl()) |
12296 | << Base << Existing->getType() << Existing->getSourceRange(); |
12297 | S.Diag(BI.getBeginLoc(), diag::note_vbase_moved_here) |
12298 | << (Base->getCanonicalDecl() == |
12299 | BI.getType()->getAsCXXRecordDecl()->getCanonicalDecl()) |
12300 | << Base << BI.getType() << BaseSpec->getSourceRange(); |
12301 | |
12302 | // Only diagnose each vbase once. |
12303 | Existing = nullptr; |
12304 | } |
12305 | } else { |
12306 | // Only walk over bases that have defaulted move assignment operators. |
12307 | // We assume that any user-provided move assignment operator handles |
12308 | // the multiple-moves-of-vbase case itself somehow. |
12309 | if (!SMOR.getMethod()->isDefaulted()) |
12310 | continue; |
12311 | |
12312 | // We're going to move the base classes of Base. Add them to the list. |
12313 | for (auto &BI : Base->bases()) |
12314 | Worklist.push_back(&BI); |
12315 | } |
12316 | } |
12317 | } |
12318 | } |
12319 | |
12320 | void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, |
12321 | CXXMethodDecl *MoveAssignOperator) { |
12322 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12327, __PRETTY_FUNCTION__)) |
12323 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12327, __PRETTY_FUNCTION__)) |
12324 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12327, __PRETTY_FUNCTION__)) |
12325 | !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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12327, __PRETTY_FUNCTION__)) |
12326 | !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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12327, __PRETTY_FUNCTION__)) |
12327 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12327, __PRETTY_FUNCTION__)); |
12328 | if (MoveAssignOperator->willHaveBody() || MoveAssignOperator->isInvalidDecl()) |
12329 | return; |
12330 | |
12331 | CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); |
12332 | if (ClassDecl->isInvalidDecl()) { |
12333 | MoveAssignOperator->setInvalidDecl(); |
12334 | return; |
12335 | } |
12336 | |
12337 | // C++0x [class.copy]p28: |
12338 | // The implicitly-defined or move assignment operator for a non-union class |
12339 | // X performs memberwise move assignment of its subobjects. The direct base |
12340 | // classes of X are assigned first, in the order of their declaration in the |
12341 | // base-specifier-list, and then the immediate non-static data members of X |
12342 | // are assigned, in the order in which they were declared in the class |
12343 | // definition. |
12344 | |
12345 | // Issue a warning if our implicit move assignment operator will move |
12346 | // from a virtual base more than once. |
12347 | checkMoveAssignmentForRepeatedMove(*this, ClassDecl, CurrentLocation); |
12348 | |
12349 | SynthesizedFunctionScope Scope(*this, MoveAssignOperator); |
12350 | |
12351 | // The exception specification is needed because we are defining the |
12352 | // function. |
12353 | ResolveExceptionSpec(CurrentLocation, |
12354 | MoveAssignOperator->getType()->castAs<FunctionProtoType>()); |
12355 | |
12356 | // Add a context note for diagnostics produced after this point. |
12357 | Scope.addContextNote(CurrentLocation); |
12358 | |
12359 | // The statements that form the synthesized function body. |
12360 | SmallVector<Stmt*, 8> Statements; |
12361 | |
12362 | // The parameter for the "other" object, which we are move from. |
12363 | ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); |
12364 | QualType OtherRefType = Other->getType()-> |
12365 | getAs<RValueReferenceType>()->getPointeeType(); |
12366 | |
12367 | // Our location for everything implicitly-generated. |
12368 | SourceLocation Loc = MoveAssignOperator->getEndLoc().isValid() |
12369 | ? MoveAssignOperator->getEndLoc() |
12370 | : MoveAssignOperator->getLocation(); |
12371 | |
12372 | // Builds a reference to the "other" object. |
12373 | RefBuilder OtherRef(Other, OtherRefType); |
12374 | // Cast to rvalue. |
12375 | MoveCastBuilder MoveOther(OtherRef); |
12376 | |
12377 | // Builds the "this" pointer. |
12378 | ThisBuilder This; |
12379 | |
12380 | // Assign base classes. |
12381 | bool Invalid = false; |
12382 | for (auto &Base : ClassDecl->bases()) { |
12383 | // C++11 [class.copy]p28: |
12384 | // It is unspecified whether subobjects representing virtual base classes |
12385 | // are assigned more than once by the implicitly-defined copy assignment |
12386 | // operator. |
12387 | // FIXME: Do not assign to a vbase that will be assigned by some other base |
12388 | // class. For a move-assignment, this can result in the vbase being moved |
12389 | // multiple times. |
12390 | |
12391 | // Form the assignment: |
12392 | // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); |
12393 | QualType BaseType = Base.getType().getUnqualifiedType(); |
12394 | if (!BaseType->isRecordType()) { |
12395 | Invalid = true; |
12396 | continue; |
12397 | } |
12398 | |
12399 | CXXCastPath BasePath; |
12400 | BasePath.push_back(&Base); |
12401 | |
12402 | // Construct the "from" expression, which is an implicit cast to the |
12403 | // appropriately-qualified base type. |
12404 | CastBuilder From(OtherRef, BaseType, VK_XValue, BasePath); |
12405 | |
12406 | // Dereference "this". |
12407 | DerefBuilder DerefThis(This); |
12408 | |
12409 | // Implicitly cast "this" to the appropriately-qualified base type. |
12410 | CastBuilder To(DerefThis, |
12411 | Context.getQualifiedType( |
12412 | BaseType, MoveAssignOperator->getMethodQualifiers()), |
12413 | VK_LValue, BasePath); |
12414 | |
12415 | // Build the move. |
12416 | StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType, |
12417 | To, From, |
12418 | /*CopyingBaseSubobject=*/true, |
12419 | /*Copying=*/false); |
12420 | if (Move.isInvalid()) { |
12421 | MoveAssignOperator->setInvalidDecl(); |
12422 | return; |
12423 | } |
12424 | |
12425 | // Success! Record the move. |
12426 | Statements.push_back(Move.getAs<Expr>()); |
12427 | } |
12428 | |
12429 | // Assign non-static members. |
12430 | for (auto *Field : ClassDecl->fields()) { |
12431 | // FIXME: We should form some kind of AST representation for the implied |
12432 | // memcpy in a union copy operation. |
12433 | if (Field->isUnnamedBitfield() || Field->getParent()->isUnion()) |
12434 | continue; |
12435 | |
12436 | if (Field->isInvalidDecl()) { |
12437 | Invalid = true; |
12438 | continue; |
12439 | } |
12440 | |
12441 | // Check for members of reference type; we can't move those. |
12442 | if (Field->getType()->isReferenceType()) { |
12443 | Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) |
12444 | << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); |
12445 | Diag(Field->getLocation(), diag::note_declared_at); |
12446 | Invalid = true; |
12447 | continue; |
12448 | } |
12449 | |
12450 | // Check for members of const-qualified, non-class type. |
12451 | QualType BaseType = Context.getBaseElementType(Field->getType()); |
12452 | if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { |
12453 | Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) |
12454 | << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); |
12455 | Diag(Field->getLocation(), diag::note_declared_at); |
12456 | Invalid = true; |
12457 | continue; |
12458 | } |
12459 | |
12460 | // Suppress assigning zero-width bitfields. |
12461 | if (Field->isZeroLengthBitField(Context)) |
12462 | continue; |
12463 | |
12464 | QualType FieldType = Field->getType().getNonReferenceType(); |
12465 | if (FieldType->isIncompleteArrayType()) { |
12466 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12467, __PRETTY_FUNCTION__)) |
12467 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12467, __PRETTY_FUNCTION__)); |
12468 | continue; |
12469 | } |
12470 | |
12471 | // Build references to the field in the object we're copying from and to. |
12472 | LookupResult MemberLookup(*this, Field->getDeclName(), Loc, |
12473 | LookupMemberName); |
12474 | MemberLookup.addDecl(Field); |
12475 | MemberLookup.resolveKind(); |
12476 | MemberBuilder From(MoveOther, OtherRefType, |
12477 | /*IsArrow=*/false, MemberLookup); |
12478 | MemberBuilder To(This, getCurrentThisType(), |
12479 | /*IsArrow=*/true, MemberLookup); |
12480 | |
12481 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12483, __PRETTY_FUNCTION__)) |
12482 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12483, __PRETTY_FUNCTION__)) |
12483 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12483, __PRETTY_FUNCTION__)); |
12484 | |
12485 | // Build the move of this field. |
12486 | StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType, |
12487 | To, From, |
12488 | /*CopyingBaseSubobject=*/false, |
12489 | /*Copying=*/false); |
12490 | if (Move.isInvalid()) { |
12491 | MoveAssignOperator->setInvalidDecl(); |
12492 | return; |
12493 | } |
12494 | |
12495 | // Success! Record the copy. |
12496 | Statements.push_back(Move.getAs<Stmt>()); |
12497 | } |
12498 | |
12499 | if (!Invalid) { |
12500 | // Add a "return *this;" |
12501 | ExprResult ThisObj = |
12502 | CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc)); |
12503 | |
12504 | StmtResult Return = BuildReturnStmt(Loc, ThisObj.get()); |
12505 | if (Return.isInvalid()) |
12506 | Invalid = true; |
12507 | else |
12508 | Statements.push_back(Return.getAs<Stmt>()); |
12509 | } |
12510 | |
12511 | if (Invalid) { |
12512 | MoveAssignOperator->setInvalidDecl(); |
12513 | return; |
12514 | } |
12515 | |
12516 | StmtResult Body; |
12517 | { |
12518 | CompoundScopeRAII CompoundScope(*this); |
12519 | Body = ActOnCompoundStmt(Loc, Loc, Statements, |
12520 | /*isStmtExpr=*/false); |
12521 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12521, __PRETTY_FUNCTION__)); |
12522 | } |
12523 | MoveAssignOperator->setBody(Body.getAs<Stmt>()); |
12524 | MoveAssignOperator->markUsed(Context); |
12525 | |
12526 | if (ASTMutationListener *L = getASTMutationListener()) { |
12527 | L->CompletedImplicitDefinition(MoveAssignOperator); |
12528 | } |
12529 | } |
12530 | |
12531 | CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( |
12532 | CXXRecordDecl *ClassDecl) { |
12533 | // C++ [class.copy]p4: |
12534 | // If the class definition does not explicitly declare a copy |
12535 | // constructor, one is declared implicitly. |
12536 | assert(ClassDecl->needsImplicitCopyConstructor())((ClassDecl->needsImplicitCopyConstructor()) ? static_cast <void> (0) : __assert_fail ("ClassDecl->needsImplicitCopyConstructor()" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12536, __PRETTY_FUNCTION__)); |
12537 | |
12538 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor); |
12539 | if (DSM.isAlreadyBeingDeclared()) |
12540 | return nullptr; |
12541 | |
12542 | QualType ClassType = Context.getTypeDeclType(ClassDecl); |
12543 | QualType ArgType = ClassType; |
12544 | bool Const = ClassDecl->implicitCopyConstructorHasConstParam(); |
12545 | if (Const) |
12546 | ArgType = ArgType.withConst(); |
12547 | |
12548 | if (Context.getLangOpts().OpenCLCPlusPlus) |
12549 | ArgType = Context.getAddrSpaceQualType(ArgType, LangAS::opencl_generic); |
12550 | |
12551 | ArgType = Context.getLValueReferenceType(ArgType); |
12552 | |
12553 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, |
12554 | CXXCopyConstructor, |
12555 | Const); |
12556 | |
12557 | DeclarationName Name |
12558 | = Context.DeclarationNames.getCXXConstructorName( |
12559 | Context.getCanonicalType(ClassType)); |
12560 | SourceLocation ClassLoc = ClassDecl->getLocation(); |
12561 | DeclarationNameInfo NameInfo(Name, ClassLoc); |
12562 | |
12563 | // An implicitly-declared copy constructor is an inline public |
12564 | // member of its class. |
12565 | CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( |
12566 | Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/nullptr, |
12567 | ExplicitSpecifier(), |
12568 | /*isInline=*/true, |
12569 | /*isImplicitlyDeclared=*/true, Constexpr); |
12570 | CopyConstructor->setAccess(AS_public); |
12571 | CopyConstructor->setDefaulted(); |
12572 | |
12573 | if (getLangOpts().CUDA) { |
12574 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXCopyConstructor, |
12575 | CopyConstructor, |
12576 | /* ConstRHS */ Const, |
12577 | /* Diagnose */ false); |
12578 | } |
12579 | |
12580 | setupImplicitSpecialMemberType(CopyConstructor, Context.VoidTy, ArgType); |
12581 | |
12582 | // Add the parameter to the constructor. |
12583 | ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, |
12584 | ClassLoc, ClassLoc, |
12585 | /*IdentifierInfo=*/nullptr, |
12586 | ArgType, /*TInfo=*/nullptr, |
12587 | SC_None, nullptr); |
12588 | CopyConstructor->setParams(FromParam); |
12589 | |
12590 | CopyConstructor->setTrivial( |
12591 | ClassDecl->needsOverloadResolutionForCopyConstructor() |
12592 | ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor) |
12593 | : ClassDecl->hasTrivialCopyConstructor()); |
12594 | |
12595 | CopyConstructor->setTrivialForCall( |
12596 | ClassDecl->hasAttr<TrivialABIAttr>() || |
12597 | (ClassDecl->needsOverloadResolutionForCopyConstructor() |
12598 | ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor, |
12599 | TAH_ConsiderTrivialABI) |
12600 | : ClassDecl->hasTrivialCopyConstructorForCall())); |
12601 | |
12602 | // Note that we have declared this constructor. |
12603 | ++getASTContext().NumImplicitCopyConstructorsDeclared; |
12604 | |
12605 | Scope *S = getScopeForContext(ClassDecl); |
12606 | CheckImplicitSpecialMemberDeclaration(S, CopyConstructor); |
12607 | |
12608 | if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) { |
12609 | ClassDecl->setImplicitCopyConstructorIsDeleted(); |
12610 | SetDeclDeleted(CopyConstructor, ClassLoc); |
12611 | } |
12612 | |
12613 | if (S) |
12614 | PushOnScopeChains(CopyConstructor, S, false); |
12615 | ClassDecl->addDecl(CopyConstructor); |
12616 | |
12617 | return CopyConstructor; |
12618 | } |
12619 | |
12620 | void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, |
12621 | CXXConstructorDecl *CopyConstructor) { |
12622 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12626, __PRETTY_FUNCTION__)) |
12623 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12626, __PRETTY_FUNCTION__)) |
12624 | !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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12626, __PRETTY_FUNCTION__)) |
12625 | !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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12626, __PRETTY_FUNCTION__)) |
12626 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12626, __PRETTY_FUNCTION__)); |
12627 | if (CopyConstructor->willHaveBody() || CopyConstructor->isInvalidDecl()) |
12628 | return; |
12629 | |
12630 | CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); |
12631 | assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor")((ClassDecl && "DefineImplicitCopyConstructor - invalid constructor" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl && \"DefineImplicitCopyConstructor - invalid constructor\"" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12631, __PRETTY_FUNCTION__)); |
12632 | |
12633 | SynthesizedFunctionScope Scope(*this, CopyConstructor); |
12634 | |
12635 | // The exception specification is needed because we are defining the |
12636 | // function. |
12637 | ResolveExceptionSpec(CurrentLocation, |
12638 | CopyConstructor->getType()->castAs<FunctionProtoType>()); |
12639 | MarkVTableUsed(CurrentLocation, ClassDecl); |
12640 | |
12641 | // Add a context note for diagnostics produced after this point. |
12642 | Scope.addContextNote(CurrentLocation); |
12643 | |
12644 | // C++11 [class.copy]p7: |
12645 | // The [definition of an implicitly declared copy constructor] is |
12646 | // deprecated if the class has a user-declared copy assignment operator |
12647 | // or a user-declared destructor. |
12648 | if (getLangOpts().CPlusPlus11 && CopyConstructor->isImplicit()) |
12649 | diagnoseDeprecatedCopyOperation(*this, CopyConstructor); |
12650 | |
12651 | if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false)) { |
12652 | CopyConstructor->setInvalidDecl(); |
12653 | } else { |
12654 | SourceLocation Loc = CopyConstructor->getEndLoc().isValid() |
12655 | ? CopyConstructor->getEndLoc() |
12656 | : CopyConstructor->getLocation(); |
12657 | Sema::CompoundScopeRAII CompoundScope(*this); |
12658 | CopyConstructor->setBody( |
12659 | ActOnCompoundStmt(Loc, Loc, None, /*isStmtExpr=*/false).getAs<Stmt>()); |
12660 | CopyConstructor->markUsed(Context); |
12661 | } |
12662 | |
12663 | if (ASTMutationListener *L = getASTMutationListener()) { |
12664 | L->CompletedImplicitDefinition(CopyConstructor); |
12665 | } |
12666 | } |
12667 | |
12668 | CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( |
12669 | CXXRecordDecl *ClassDecl) { |
12670 | assert(ClassDecl->needsImplicitMoveConstructor())((ClassDecl->needsImplicitMoveConstructor()) ? static_cast <void> (0) : __assert_fail ("ClassDecl->needsImplicitMoveConstructor()" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12670, __PRETTY_FUNCTION__)); |
12671 | |
12672 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor); |
12673 | if (DSM.isAlreadyBeingDeclared()) |
12674 | return nullptr; |
12675 | |
12676 | QualType ClassType = Context.getTypeDeclType(ClassDecl); |
12677 | |
12678 | QualType ArgType = ClassType; |
12679 | if (Context.getLangOpts().OpenCLCPlusPlus) |
12680 | ArgType = Context.getAddrSpaceQualType(ClassType, LangAS::opencl_generic); |
12681 | ArgType = Context.getRValueReferenceType(ArgType); |
12682 | |
12683 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, |
12684 | CXXMoveConstructor, |
12685 | false); |
12686 | |
12687 | DeclarationName Name |
12688 | = Context.DeclarationNames.getCXXConstructorName( |
12689 | Context.getCanonicalType(ClassType)); |
12690 | SourceLocation ClassLoc = ClassDecl->getLocation(); |
12691 | DeclarationNameInfo NameInfo(Name, ClassLoc); |
12692 | |
12693 | // C++11 [class.copy]p11: |
12694 | // An implicitly-declared copy/move constructor is an inline public |
12695 | // member of its class. |
12696 | CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( |
12697 | Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/nullptr, |
12698 | ExplicitSpecifier(), |
12699 | /*isInline=*/true, |
12700 | /*isImplicitlyDeclared=*/true, Constexpr); |
12701 | MoveConstructor->setAccess(AS_public); |
12702 | MoveConstructor->setDefaulted(); |
12703 | |
12704 | if (getLangOpts().CUDA) { |
12705 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXMoveConstructor, |
12706 | MoveConstructor, |
12707 | /* ConstRHS */ false, |
12708 | /* Diagnose */ false); |
12709 | } |
12710 | |
12711 | setupImplicitSpecialMemberType(MoveConstructor, Context.VoidTy, ArgType); |
12712 | |
12713 | // Add the parameter to the constructor. |
12714 | ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, |
12715 | ClassLoc, ClassLoc, |
12716 | /*IdentifierInfo=*/nullptr, |
12717 | ArgType, /*TInfo=*/nullptr, |
12718 | SC_None, nullptr); |
12719 | MoveConstructor->setParams(FromParam); |
12720 | |
12721 | MoveConstructor->setTrivial( |
12722 | ClassDecl->needsOverloadResolutionForMoveConstructor() |
12723 | ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor) |
12724 | : ClassDecl->hasTrivialMoveConstructor()); |
12725 | |
12726 | MoveConstructor->setTrivialForCall( |
12727 | ClassDecl->hasAttr<TrivialABIAttr>() || |
12728 | (ClassDecl->needsOverloadResolutionForMoveConstructor() |
12729 | ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor, |
12730 | TAH_ConsiderTrivialABI) |
12731 | : ClassDecl->hasTrivialMoveConstructorForCall())); |
12732 | |
12733 | // Note that we have declared this constructor. |
12734 | ++getASTContext().NumImplicitMoveConstructorsDeclared; |
12735 | |
12736 | Scope *S = getScopeForContext(ClassDecl); |
12737 | CheckImplicitSpecialMemberDeclaration(S, MoveConstructor); |
12738 | |
12739 | if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { |
12740 | ClassDecl->setImplicitMoveConstructorIsDeleted(); |
12741 | SetDeclDeleted(MoveConstructor, ClassLoc); |
12742 | } |
12743 | |
12744 | if (S) |
12745 | PushOnScopeChains(MoveConstructor, S, false); |
12746 | ClassDecl->addDecl(MoveConstructor); |
12747 | |
12748 | return MoveConstructor; |
12749 | } |
12750 | |
12751 | void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, |
12752 | CXXConstructorDecl *MoveConstructor) { |
12753 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12757, __PRETTY_FUNCTION__)) |
12754 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12757, __PRETTY_FUNCTION__)) |
12755 | !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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12757, __PRETTY_FUNCTION__)) |
12756 | !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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12757, __PRETTY_FUNCTION__)) |
12757 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12757, __PRETTY_FUNCTION__)); |
12758 | if (MoveConstructor->willHaveBody() || MoveConstructor->isInvalidDecl()) |
12759 | return; |
12760 | |
12761 | CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); |
12762 | assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor")((ClassDecl && "DefineImplicitMoveConstructor - invalid constructor" ) ? static_cast<void> (0) : __assert_fail ("ClassDecl && \"DefineImplicitMoveConstructor - invalid constructor\"" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12762, __PRETTY_FUNCTION__)); |
12763 | |
12764 | SynthesizedFunctionScope Scope(*this, MoveConstructor); |
12765 | |
12766 | // The exception specification is needed because we are defining the |
12767 | // function. |
12768 | ResolveExceptionSpec(CurrentLocation, |
12769 | MoveConstructor->getType()->castAs<FunctionProtoType>()); |
12770 | MarkVTableUsed(CurrentLocation, ClassDecl); |
12771 | |
12772 | // Add a context note for diagnostics produced after this point. |
12773 | Scope.addContextNote(CurrentLocation); |
12774 | |
12775 | if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false)) { |
12776 | MoveConstructor->setInvalidDecl(); |
12777 | } else { |
12778 | SourceLocation Loc = MoveConstructor->getEndLoc().isValid() |
12779 | ? MoveConstructor->getEndLoc() |
12780 | : MoveConstructor->getLocation(); |
12781 | Sema::CompoundScopeRAII CompoundScope(*this); |
12782 | MoveConstructor->setBody(ActOnCompoundStmt( |
12783 | Loc, Loc, None, /*isStmtExpr=*/ false).getAs<Stmt>()); |
12784 | MoveConstructor->markUsed(Context); |
12785 | } |
12786 | |
12787 | if (ASTMutationListener *L = getASTMutationListener()) { |
12788 | L->CompletedImplicitDefinition(MoveConstructor); |
12789 | } |
12790 | } |
12791 | |
12792 | bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { |
12793 | return FD->isDeleted() && FD->isDefaulted() && isa<CXXMethodDecl>(FD); |
12794 | } |
12795 | |
12796 | void Sema::DefineImplicitLambdaToFunctionPointerConversion( |
12797 | SourceLocation CurrentLocation, |
12798 | CXXConversionDecl *Conv) { |
12799 | SynthesizedFunctionScope Scope(*this, Conv); |
12800 | assert(!Conv->getReturnType()->isUndeducedType())((!Conv->getReturnType()->isUndeducedType()) ? static_cast <void> (0) : __assert_fail ("!Conv->getReturnType()->isUndeducedType()" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12800, __PRETTY_FUNCTION__)); |
12801 | |
12802 | CXXRecordDecl *Lambda = Conv->getParent(); |
12803 | FunctionDecl *CallOp = Lambda->getLambdaCallOperator(); |
12804 | FunctionDecl *Invoker = Lambda->getLambdaStaticInvoker(); |
12805 | |
12806 | if (auto *TemplateArgs = Conv->getTemplateSpecializationArgs()) { |
12807 | CallOp = InstantiateFunctionDeclaration( |
12808 | CallOp->getDescribedFunctionTemplate(), TemplateArgs, CurrentLocation); |
12809 | if (!CallOp) |
12810 | return; |
12811 | |
12812 | Invoker = InstantiateFunctionDeclaration( |
12813 | Invoker->getDescribedFunctionTemplate(), TemplateArgs, CurrentLocation); |
12814 | if (!Invoker) |
12815 | return; |
12816 | } |
12817 | |
12818 | if (CallOp->isInvalidDecl()) |
12819 | return; |
12820 | |
12821 | // Mark the call operator referenced (and add to pending instantiations |
12822 | // if necessary). |
12823 | // For both the conversion and static-invoker template specializations |
12824 | // we construct their body's in this function, so no need to add them |
12825 | // to the PendingInstantiations. |
12826 | MarkFunctionReferenced(CurrentLocation, CallOp); |
12827 | |
12828 | // Fill in the __invoke function with a dummy implementation. IR generation |
12829 | // will fill in the actual details. Update its type in case it contained |
12830 | // an 'auto'. |
12831 | Invoker->markUsed(Context); |
12832 | Invoker->setReferenced(); |
12833 | Invoker->setType(Conv->getReturnType()->getPointeeType()); |
12834 | Invoker->setBody(new (Context) CompoundStmt(Conv->getLocation())); |
12835 | |
12836 | // Construct the body of the conversion function { return __invoke; }. |
12837 | Expr *FunctionRef = BuildDeclRefExpr(Invoker, Invoker->getType(), |
12838 | VK_LValue, Conv->getLocation()).get(); |
12839 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12839, __PRETTY_FUNCTION__)); |
12840 | Stmt *Return = BuildReturnStmt(Conv->getLocation(), FunctionRef).get(); |
12841 | Conv->setBody(CompoundStmt::Create(Context, Return, Conv->getLocation(), |
12842 | Conv->getLocation())); |
12843 | Conv->markUsed(Context); |
12844 | Conv->setReferenced(); |
12845 | |
12846 | if (ASTMutationListener *L = getASTMutationListener()) { |
12847 | L->CompletedImplicitDefinition(Conv); |
12848 | L->CompletedImplicitDefinition(Invoker); |
12849 | } |
12850 | } |
12851 | |
12852 | |
12853 | |
12854 | void Sema::DefineImplicitLambdaToBlockPointerConversion( |
12855 | SourceLocation CurrentLocation, |
12856 | CXXConversionDecl *Conv) |
12857 | { |
12858 | assert(!Conv->getParent()->isGenericLambda())((!Conv->getParent()->isGenericLambda()) ? static_cast< void> (0) : __assert_fail ("!Conv->getParent()->isGenericLambda()" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 12858, __PRETTY_FUNCTION__)); |
12859 | |
12860 | SynthesizedFunctionScope Scope(*this, Conv); |
12861 | |
12862 | // Copy-initialize the lambda object as needed to capture it. |
12863 | Expr *This = ActOnCXXThis(CurrentLocation).get(); |
12864 | Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).get(); |
12865 | |
12866 | ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, |
12867 | Conv->getLocation(), |
12868 | Conv, DerefThis); |
12869 | |
12870 | // If we're not under ARC, make sure we still get the _Block_copy/autorelease |
12871 | // behavior. Note that only the general conversion function does this |
12872 | // (since it's unusable otherwise); in the case where we inline the |
12873 | // block literal, it has block literal lifetime semantics. |
12874 | if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) |
12875 | BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), |
12876 | CK_CopyAndAutoreleaseBlockObject, |
12877 | BuildBlock.get(), nullptr, VK_RValue); |
12878 | |
12879 | if (BuildBlock.isInvalid()) { |
12880 | Diag(CurrentLocation, diag::note_lambda_to_block_conv); |
12881 | Conv->setInvalidDecl(); |
12882 | return; |
12883 | } |
12884 | |
12885 | // Create the return statement that returns the block from the conversion |
12886 | // function. |
12887 | StmtResult Return = BuildReturnStmt(Conv->getLocation(), BuildBlock.get()); |
12888 | if (Return.isInvalid()) { |
12889 | Diag(CurrentLocation, diag::note_lambda_to_block_conv); |
12890 | Conv->setInvalidDecl(); |
12891 | return; |
12892 | } |
12893 | |
12894 | // Set the body of the conversion function. |
12895 | Stmt *ReturnS = Return.get(); |
12896 | Conv->setBody(CompoundStmt::Create(Context, ReturnS, Conv->getLocation(), |
12897 | Conv->getLocation())); |
12898 | Conv->markUsed(Context); |
12899 | |
12900 | // We're done; notify the mutation listener, if any. |
12901 | if (ASTMutationListener *L = getASTMutationListener()) { |
12902 | L->CompletedImplicitDefinition(Conv); |
12903 | } |
12904 | } |
12905 | |
12906 | /// Determine whether the given list arguments contains exactly one |
12907 | /// "real" (non-default) argument. |
12908 | static bool hasOneRealArgument(MultiExprArg Args) { |
12909 | switch (Args.size()) { |
12910 | case 0: |
12911 | return false; |
12912 | |
12913 | default: |
12914 | if (!Args[1]->isDefaultArgument()) |
12915 | return false; |
12916 | |
12917 | LLVM_FALLTHROUGH[[clang::fallthrough]]; |
12918 | case 1: |
12919 | return !Args[0]->isDefaultArgument(); |
12920 | } |
12921 | |
12922 | return false; |
12923 | } |
12924 | |
12925 | ExprResult |
12926 | Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, |
12927 | NamedDecl *FoundDecl, |
12928 | CXXConstructorDecl *Constructor, |
12929 | MultiExprArg ExprArgs, |
12930 | bool HadMultipleCandidates, |
12931 | bool IsListInitialization, |
12932 | bool IsStdInitListInitialization, |
12933 | bool RequiresZeroInit, |
12934 | unsigned ConstructKind, |
12935 | SourceRange ParenRange) { |
12936 | bool Elidable = false; |
12937 | |
12938 | // C++0x [class.copy]p34: |
12939 | // When certain criteria are met, an implementation is allowed to |
12940 | // omit the copy/move construction of a class object, even if the |
12941 | // copy/move constructor and/or destructor for the object have |
12942 | // side effects. [...] |
12943 | // - when a temporary class object that has not been bound to a |
12944 | // reference (12.2) would be copied/moved to a class object |
12945 | // with the same cv-unqualified type, the copy/move operation |
12946 | // can be omitted by constructing the temporary object |
12947 | // directly into the target of the omitted copy/move |
12948 | if (ConstructKind == CXXConstructExpr::CK_Complete && Constructor && |
12949 | Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { |
12950 | Expr *SubExpr = ExprArgs[0]; |
12951 | Elidable = SubExpr->isTemporaryObject( |
12952 | Context, cast<CXXRecordDecl>(FoundDecl->getDeclContext())); |
12953 | } |
12954 | |
12955 | return BuildCXXConstructExpr(ConstructLoc, DeclInitType, |
12956 | FoundDecl, Constructor, |
12957 | Elidable, ExprArgs, HadMultipleCandidates, |
12958 | IsListInitialization, |
12959 | IsStdInitListInitialization, RequiresZeroInit, |
12960 | ConstructKind, ParenRange); |
12961 | } |
12962 | |
12963 | ExprResult |
12964 | Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, |
12965 | NamedDecl *FoundDecl, |
12966 | CXXConstructorDecl *Constructor, |
12967 | bool Elidable, |
12968 | MultiExprArg ExprArgs, |
12969 | bool HadMultipleCandidates, |
12970 | bool IsListInitialization, |
12971 | bool IsStdInitListInitialization, |
12972 | bool RequiresZeroInit, |
12973 | unsigned ConstructKind, |
12974 | SourceRange ParenRange) { |
12975 | if (auto *Shadow = dyn_cast<ConstructorUsingShadowDecl>(FoundDecl)) { |
12976 | Constructor = findInheritingConstructor(ConstructLoc, Constructor, Shadow); |
12977 | if (DiagnoseUseOfDecl(Constructor, ConstructLoc)) |
12978 | return ExprError(); |
12979 | } |
12980 | |
12981 | return BuildCXXConstructExpr( |
12982 | ConstructLoc, DeclInitType, Constructor, Elidable, ExprArgs, |
12983 | HadMultipleCandidates, IsListInitialization, IsStdInitListInitialization, |
12984 | RequiresZeroInit, ConstructKind, ParenRange); |
12985 | } |
12986 | |
12987 | /// BuildCXXConstructExpr - Creates a complete call to a constructor, |
12988 | /// including handling of its default argument expressions. |
12989 | ExprResult |
12990 | Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, |
12991 | CXXConstructorDecl *Constructor, |
12992 | bool Elidable, |
12993 | MultiExprArg ExprArgs, |
12994 | bool HadMultipleCandidates, |
12995 | bool IsListInitialization, |
12996 | bool IsStdInitListInitialization, |
12997 | bool RequiresZeroInit, |
12998 | unsigned ConstructKind, |
12999 | SourceRange ParenRange) { |
13000 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 13003, __PRETTY_FUNCTION__)) |
13001 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 13003, __PRETTY_FUNCTION__)) |
13002 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 13003, __PRETTY_FUNCTION__)) |
13003 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 13003, __PRETTY_FUNCTION__)); |
13004 | MarkFunctionReferenced(ConstructLoc, Constructor); |
13005 | if (getLangOpts().CUDA && !CheckCUDACall(ConstructLoc, Constructor)) |
13006 | return ExprError(); |
13007 | |
13008 | return CXXConstructExpr::Create( |
13009 | Context, DeclInitType, ConstructLoc, Constructor, Elidable, |
13010 | ExprArgs, HadMultipleCandidates, IsListInitialization, |
13011 | IsStdInitListInitialization, RequiresZeroInit, |
13012 | static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), |
13013 | ParenRange); |
13014 | } |
13015 | |
13016 | ExprResult Sema::BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field) { |
13017 | assert(Field->hasInClassInitializer())((Field->hasInClassInitializer()) ? static_cast<void> (0) : __assert_fail ("Field->hasInClassInitializer()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 13017, __PRETTY_FUNCTION__)); |
13018 | |
13019 | // If we already have the in-class initializer nothing needs to be done. |
13020 | if (Field->getInClassInitializer()) |
13021 | return CXXDefaultInitExpr::Create(Context, Loc, Field); |
13022 | |
13023 | // If we might have already tried and failed to instantiate, don't try again. |
13024 | if (Field->isInvalidDecl()) |
13025 | return ExprError(); |
13026 | |
13027 | // Maybe we haven't instantiated the in-class initializer. Go check the |
13028 | // pattern FieldDecl to see if it has one. |
13029 | CXXRecordDecl *ParentRD = cast<CXXRecordDecl>(Field->getParent()); |
13030 | |
13031 | if (isTemplateInstantiation(ParentRD->getTemplateSpecializationKind())) { |
13032 | CXXRecordDecl *ClassPattern = ParentRD->getTemplateInstantiationPattern(); |
13033 | DeclContext::lookup_result Lookup = |
13034 | ClassPattern->lookup(Field->getDeclName()); |
13035 | |
13036 | // Lookup can return at most two results: the pattern for the field, or the |
13037 | // injected class name of the parent record. No other member can have the |
13038 | // same name as the field. |
13039 | // In modules mode, lookup can return multiple results (coming from |
13040 | // different modules). |
13041 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 13042, __PRETTY_FUNCTION__)) |
13042 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 13042, __PRETTY_FUNCTION__)); |
13043 | FieldDecl *Pattern = dyn_cast<FieldDecl>(Lookup[0]); |
13044 | if (!Pattern) { |
13045 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 13046, __PRETTY_FUNCTION__)) |
13046 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 13046, __PRETTY_FUNCTION__)); |
13047 | for (auto L : Lookup) |
13048 | if (isa<FieldDecl>(L)) { |
13049 | Pattern = cast<FieldDecl>(L); |
13050 | break; |
13051 | } |
13052 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 13052, __PRETTY_FUNCTION__)); |
13053 | } |
13054 | |
13055 | if (!Pattern->hasInClassInitializer() || |
13056 | InstantiateInClassInitializer(Loc, Field, Pattern, |
13057 | getTemplateInstantiationArgs(Field))) { |
13058 | // Don't diagnose this again. |
13059 | Field->setInvalidDecl(); |
13060 | return ExprError(); |
13061 | } |
13062 | return CXXDefaultInitExpr::Create(Context, Loc, Field); |
13063 | } |
13064 | |
13065 | // DR1351: |
13066 | // If the brace-or-equal-initializer of a non-static data member |
13067 | // invokes a defaulted default constructor of its class or of an |
13068 | // enclosing class in a potentially evaluated subexpression, the |
13069 | // program is ill-formed. |
13070 | // |
13071 | // This resolution is unworkable: the exception specification of the |
13072 | // default constructor can be needed in an unevaluated context, in |
13073 | // particular, in the operand of a noexcept-expression, and we can be |
13074 | // unable to compute an exception specification for an enclosed class. |
13075 | // |
13076 | // Any attempt to resolve the exception specification of a defaulted default |
13077 | // constructor before the initializer is lexically complete will ultimately |
13078 | // come here at which point we can diagnose it. |
13079 | RecordDecl *OutermostClass = ParentRD->getOuterLexicalRecordContext(); |
13080 | Diag(Loc, diag::err_in_class_initializer_not_yet_parsed) |
13081 | << OutermostClass << Field; |
13082 | Diag(Field->getEndLoc(), diag::note_in_class_initializer_not_yet_parsed); |
13083 | // Recover by marking the field invalid, unless we're in a SFINAE context. |
13084 | if (!isSFINAEContext()) |
13085 | Field->setInvalidDecl(); |
13086 | return ExprError(); |
13087 | } |
13088 | |
13089 | void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { |
13090 | if (VD->isInvalidDecl()) return; |
13091 | |
13092 | CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); |
13093 | if (ClassDecl->isInvalidDecl()) return; |
13094 | if (ClassDecl->hasIrrelevantDestructor()) return; |
13095 | if (ClassDecl->isDependentContext()) return; |
13096 | |
13097 | if (VD->isNoDestroy(getASTContext())) |
13098 | return; |
13099 | |
13100 | CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); |
13101 | MarkFunctionReferenced(VD->getLocation(), Destructor); |
13102 | CheckDestructorAccess(VD->getLocation(), Destructor, |
13103 | PDiag(diag::err_access_dtor_var) |
13104 | << VD->getDeclName() |
13105 | << VD->getType()); |
13106 | DiagnoseUseOfDecl(Destructor, VD->getLocation()); |
13107 | |
13108 | if (Destructor->isTrivial()) return; |
13109 | if (!VD->hasGlobalStorage()) return; |
13110 | |
13111 | // Emit warning for non-trivial dtor in global scope (a real global, |
13112 | // class-static, function-static). |
13113 | Diag(VD->getLocation(), diag::warn_exit_time_destructor); |
13114 | |
13115 | // TODO: this should be re-enabled for static locals by !CXAAtExit |
13116 | if (!VD->isStaticLocal()) |
13117 | Diag(VD->getLocation(), diag::warn_global_destructor); |
13118 | } |
13119 | |
13120 | /// Given a constructor and the set of arguments provided for the |
13121 | /// constructor, convert the arguments and add any required default arguments |
13122 | /// to form a proper call to this constructor. |
13123 | /// |
13124 | /// \returns true if an error occurred, false otherwise. |
13125 | bool |
13126 | Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, |
13127 | MultiExprArg ArgsPtr, |
13128 | SourceLocation Loc, |
13129 | SmallVectorImpl<Expr*> &ConvertedArgs, |
13130 | bool AllowExplicit, |
13131 | bool IsListInitialization) { |
13132 | // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. |
13133 | unsigned NumArgs = ArgsPtr.size(); |
13134 | Expr **Args = ArgsPtr.data(); |
13135 | |
13136 | const FunctionProtoType *Proto |
13137 | = Constructor->getType()->getAs<FunctionProtoType>(); |
13138 | assert(Proto && "Constructor without a prototype?")((Proto && "Constructor without a prototype?") ? static_cast <void> (0) : __assert_fail ("Proto && \"Constructor without a prototype?\"" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 13138, __PRETTY_FUNCTION__)); |
13139 | unsigned NumParams = Proto->getNumParams(); |
13140 | |
13141 | // If too few arguments are available, we'll fill in the rest with defaults. |
13142 | if (NumArgs < NumParams) |
13143 | ConvertedArgs.reserve(NumParams); |
13144 | else |
13145 | ConvertedArgs.reserve(NumArgs); |
13146 | |
13147 | VariadicCallType CallType = |
13148 | Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; |
13149 | SmallVector<Expr *, 8> AllArgs; |
13150 | bool Invalid = GatherArgumentsForCall(Loc, Constructor, |
13151 | Proto, 0, |
13152 | llvm::makeArrayRef(Args, NumArgs), |
13153 | AllArgs, |
13154 | CallType, AllowExplicit, |
13155 | IsListInitialization); |
13156 | ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); |
13157 | |
13158 | DiagnoseSentinelCalls(Constructor, Loc, AllArgs); |
13159 | |
13160 | CheckConstructorCall(Constructor, |
13161 | llvm::makeArrayRef(AllArgs.data(), AllArgs.size()), |
13162 | Proto, Loc); |
13163 | |
13164 | return Invalid; |
13165 | } |
13166 | |
13167 | static inline bool |
13168 | CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, |
13169 | const FunctionDecl *FnDecl) { |
13170 | const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); |
13171 | if (isa<NamespaceDecl>(DC)) { |
13172 | return SemaRef.Diag(FnDecl->getLocation(), |
13173 | diag::err_operator_new_delete_declared_in_namespace) |
13174 | << FnDecl->getDeclName(); |
13175 | } |
13176 | |
13177 | if (isa<TranslationUnitDecl>(DC) && |
13178 | FnDecl->getStorageClass() == SC_Static) { |
13179 | return SemaRef.Diag(FnDecl->getLocation(), |
13180 | diag::err_operator_new_delete_declared_static) |
13181 | << FnDecl->getDeclName(); |
13182 | } |
13183 | |
13184 | return false; |
13185 | } |
13186 | |
13187 | static QualType |
13188 | RemoveAddressSpaceFromPtr(Sema &SemaRef, const PointerType *PtrTy) { |
13189 | QualType QTy = PtrTy->getPointeeType(); |
13190 | QTy = SemaRef.Context.removeAddrSpaceQualType(QTy); |
13191 | return SemaRef.Context.getPointerType(QTy); |
13192 | } |
13193 | |
13194 | static inline bool |
13195 | CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, |
13196 | CanQualType ExpectedResultType, |
13197 | CanQualType ExpectedFirstParamType, |
13198 | unsigned DependentParamTypeDiag, |
13199 | unsigned InvalidParamTypeDiag) { |
13200 | QualType ResultType = |
13201 | FnDecl->getType()->getAs<FunctionType>()->getReturnType(); |
13202 | |
13203 | // Check that the result type is not dependent. |
13204 | if (ResultType->isDependentType()) |
13205 | return SemaRef.Diag(FnDecl->getLocation(), |
13206 | diag::err_operator_new_delete_dependent_result_type) |
13207 | << FnDecl->getDeclName() << ExpectedResultType; |
13208 | |
13209 | // OpenCL C++: the operator is valid on any address space. |
13210 | if (SemaRef.getLangOpts().OpenCLCPlusPlus) { |
13211 | if (auto *PtrTy = ResultType->getAs<PointerType>()) { |
13212 | ResultType = RemoveAddressSpaceFromPtr(SemaRef, PtrTy); |
13213 | } |
13214 | } |
13215 | |
13216 | // Check that the result type is what we expect. |
13217 | if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) |
13218 | return SemaRef.Diag(FnDecl->getLocation(), |
13219 | diag::err_operator_new_delete_invalid_result_type) |
13220 | << FnDecl->getDeclName() << ExpectedResultType; |
13221 | |
13222 | // A function template must have at least 2 parameters. |
13223 | if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) |
13224 | return SemaRef.Diag(FnDecl->getLocation(), |
13225 | diag::err_operator_new_delete_template_too_few_parameters) |
13226 | << FnDecl->getDeclName(); |
13227 | |
13228 | // The function decl must have at least 1 parameter. |
13229 | if (FnDecl->getNumParams() == 0) |
13230 | return SemaRef.Diag(FnDecl->getLocation(), |
13231 | diag::err_operator_new_delete_too_few_parameters) |
13232 | << FnDecl->getDeclName(); |
13233 | |
13234 | // Check the first parameter type is not dependent. |
13235 | QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); |
13236 | if (FirstParamType->isDependentType()) |
13237 | return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) |
13238 | << FnDecl->getDeclName() << ExpectedFirstParamType; |
13239 | |
13240 | // Check that the first parameter type is what we expect. |
13241 | if (SemaRef.getLangOpts().OpenCLCPlusPlus) { |
13242 | // OpenCL C++: the operator is valid on any address space. |
13243 | if (auto *PtrTy = |
13244 | FnDecl->getParamDecl(0)->getType()->getAs<PointerType>()) { |
13245 | FirstParamType = RemoveAddressSpaceFromPtr(SemaRef, PtrTy); |
13246 | } |
13247 | } |
13248 | if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != |
13249 | ExpectedFirstParamType) |
13250 | return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) |
13251 | << FnDecl->getDeclName() << ExpectedFirstParamType; |
13252 | |
13253 | return false; |
13254 | } |
13255 | |
13256 | static bool |
13257 | CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { |
13258 | // C++ [basic.stc.dynamic.allocation]p1: |
13259 | // A program is ill-formed if an allocation function is declared in a |
13260 | // namespace scope other than global scope or declared static in global |
13261 | // scope. |
13262 | if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) |
13263 | return true; |
13264 | |
13265 | CanQualType SizeTy = |
13266 | SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); |
13267 | |
13268 | // C++ [basic.stc.dynamic.allocation]p1: |
13269 | // The return type shall be void*. The first parameter shall have type |
13270 | // std::size_t. |
13271 | if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, |
13272 | SizeTy, |
13273 | diag::err_operator_new_dependent_param_type, |
13274 | diag::err_operator_new_param_type)) |
13275 | return true; |
13276 | |
13277 | // C++ [basic.stc.dynamic.allocation]p1: |
13278 | // The first parameter shall not have an associated default argument. |
13279 | if (FnDecl->getParamDecl(0)->hasDefaultArg()) |
13280 | return SemaRef.Diag(FnDecl->getLocation(), |
13281 | diag::err_operator_new_default_arg) |
13282 | << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); |
13283 | |
13284 | return false; |
13285 | } |
13286 | |
13287 | static bool |
13288 | CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { |
13289 | // C++ [basic.stc.dynamic.deallocation]p1: |
13290 | // A program is ill-formed if deallocation functions are declared in a |
13291 | // namespace scope other than global scope or declared static in global |
13292 | // scope. |
13293 | if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) |
13294 | return true; |
13295 | |
13296 | auto *MD = dyn_cast<CXXMethodDecl>(FnDecl); |
13297 | |
13298 | // C++ P0722: |
13299 | // Within a class C, the first parameter of a destroying operator delete |
13300 | // shall be of type C *. The first parameter of any other deallocation |
13301 | // function shall be of type void *. |
13302 | CanQualType ExpectedFirstParamType = |
13303 | MD && MD->isDestroyingOperatorDelete() |
13304 | ? SemaRef.Context.getCanonicalType(SemaRef.Context.getPointerType( |
13305 | SemaRef.Context.getRecordType(MD->getParent()))) |
13306 | : SemaRef.Context.VoidPtrTy; |
13307 | |
13308 | // C++ [basic.stc.dynamic.deallocation]p2: |
13309 | // Each deallocation function shall return void |
13310 | if (CheckOperatorNewDeleteTypes( |
13311 | SemaRef, FnDecl, SemaRef.Context.VoidTy, ExpectedFirstParamType, |
13312 | diag::err_operator_delete_dependent_param_type, |
13313 | diag::err_operator_delete_param_type)) |
13314 | return true; |
13315 | |
13316 | // C++ P0722: |
13317 | // A destroying operator delete shall be a usual deallocation function. |
13318 | if (MD && !MD->getParent()->isDependentContext() && |
13319 | MD->isDestroyingOperatorDelete() && |
13320 | !SemaRef.isUsualDeallocationFunction(MD)) { |
13321 | SemaRef.Diag(MD->getLocation(), |
13322 | diag::err_destroying_operator_delete_not_usual); |
13323 | return true; |
13324 | } |
13325 | |
13326 | return false; |
13327 | } |
13328 | |
13329 | /// CheckOverloadedOperatorDeclaration - Check whether the declaration |
13330 | /// of this overloaded operator is well-formed. If so, returns false; |
13331 | /// otherwise, emits appropriate diagnostics and returns true. |
13332 | bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { |
13333 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 13334, __PRETTY_FUNCTION__)) |
13334 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 13334, __PRETTY_FUNCTION__)); |
13335 | |
13336 | OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); |
13337 | |
13338 | // C++ [over.oper]p5: |
13339 | // The allocation and deallocation functions, operator new, |
13340 | // operator new[], operator delete and operator delete[], are |
13341 | // described completely in 3.7.3. The attributes and restrictions |
13342 | // found in the rest of this subclause do not apply to them unless |
13343 | // explicitly stated in 3.7.3. |
13344 | if (Op == OO_Delete || Op == OO_Array_Delete) |
13345 | return CheckOperatorDeleteDeclaration(*this, FnDecl); |
13346 | |
13347 | if (Op == OO_New || Op == OO_Array_New) |
13348 | return CheckOperatorNewDeclaration(*this, FnDecl); |
13349 | |
13350 | // C++ [over.oper]p6: |
13351 | // An operator function shall either be a non-static member |
13352 | // function or be a non-member function and have at least one |
13353 | // parameter whose type is a class, a reference to a class, an |
13354 | // enumeration, or a reference to an enumeration. |
13355 | if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { |
13356 | if (MethodDecl->isStatic()) |
13357 | return Diag(FnDecl->getLocation(), |
13358 | diag::err_operator_overload_static) << FnDecl->getDeclName(); |
13359 | } else { |
13360 | bool ClassOrEnumParam = false; |
13361 | for (auto Param : FnDecl->parameters()) { |
13362 | QualType ParamType = Param->getType().getNonReferenceType(); |
13363 | if (ParamType->isDependentType() || ParamType->isRecordType() || |
13364 | ParamType->isEnumeralType()) { |
13365 | ClassOrEnumParam = true; |
13366 | break; |
13367 | } |
13368 | } |
13369 | |
13370 | if (!ClassOrEnumParam) |
13371 | return Diag(FnDecl->getLocation(), |
13372 | diag::err_operator_overload_needs_class_or_enum) |
13373 | << FnDecl->getDeclName(); |
13374 | } |
13375 | |
13376 | // C++ [over.oper]p8: |
13377 | // An operator function cannot have default arguments (8.3.6), |
13378 | // except where explicitly stated below. |
13379 | // |
13380 | // Only the function-call operator allows default arguments |
13381 | // (C++ [over.call]p1). |
13382 | if (Op != OO_Call) { |
13383 | for (auto Param : FnDecl->parameters()) { |
13384 | if (Param->hasDefaultArg()) |
13385 | return Diag(Param->getLocation(), |
13386 | diag::err_operator_overload_default_arg) |
13387 | << FnDecl->getDeclName() << Param->getDefaultArgRange(); |
13388 | } |
13389 | } |
13390 | |
13391 | static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { |
13392 | { false, false, false } |
13393 | #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ |
13394 | , { Unary, Binary, MemberOnly } |
13395 | #include "clang/Basic/OperatorKinds.def" |
13396 | }; |
13397 | |
13398 | bool CanBeUnaryOperator = OperatorUses[Op][0]; |
13399 | bool CanBeBinaryOperator = OperatorUses[Op][1]; |
13400 | bool MustBeMemberOperator = OperatorUses[Op][2]; |
13401 | |
13402 | // C++ [over.oper]p8: |
13403 | // [...] Operator functions cannot have more or fewer parameters |
13404 | // than the number required for the corresponding operator, as |
13405 | // described in the rest of this subclause. |
13406 | unsigned NumParams = FnDecl->getNumParams() |
13407 | + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); |
13408 | if (Op != OO_Call && |
13409 | ((NumParams == 1 && !CanBeUnaryOperator) || |
13410 | (NumParams == 2 && !CanBeBinaryOperator) || |
13411 | (NumParams < 1) || (NumParams > 2))) { |
13412 | // We have the wrong number of parameters. |
13413 | unsigned ErrorKind; |
13414 | if (CanBeUnaryOperator && CanBeBinaryOperator) { |
13415 | ErrorKind = 2; // 2 -> unary or binary. |
13416 | } else if (CanBeUnaryOperator) { |
13417 | ErrorKind = 0; // 0 -> unary |
13418 | } else { |
13419 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 13420, __PRETTY_FUNCTION__)) |
13420 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 13420, __PRETTY_FUNCTION__)); |
13421 | ErrorKind = 1; // 1 -> binary |
13422 | } |
13423 | |
13424 | return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) |
13425 | << FnDecl->getDeclName() << NumParams << ErrorKind; |
13426 | } |
13427 | |
13428 | // Overloaded operators other than operator() cannot be variadic. |
13429 | if (Op != OO_Call && |
13430 | FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { |
13431 | return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) |
13432 | << FnDecl->getDeclName(); |
13433 | } |
13434 | |
13435 | // Some operators must be non-static member functions. |
13436 | if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { |
13437 | return Diag(FnDecl->getLocation(), |
13438 | diag::err_operator_overload_must_be_member) |
13439 | << FnDecl->getDeclName(); |
13440 | } |
13441 | |
13442 | // C++ [over.inc]p1: |
13443 | // The user-defined function called operator++ implements the |
13444 | // prefix and postfix ++ operator. If this function is a member |
13445 | // function with no parameters, or a non-member function with one |
13446 | // parameter of class or enumeration type, it defines the prefix |
13447 | // increment operator ++ for objects of that type. If the function |
13448 | // is a member function with one parameter (which shall be of type |
13449 | // int) or a non-member function with two parameters (the second |
13450 | // of which shall be of type int), it defines the postfix |
13451 | // increment operator ++ for objects of that type. |
13452 | if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { |
13453 | ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); |
13454 | QualType ParamType = LastParam->getType(); |
13455 | |
13456 | if (!ParamType->isSpecificBuiltinType(BuiltinType::Int) && |
13457 | !ParamType->isDependentType()) |
13458 | return Diag(LastParam->getLocation(), |
13459 | diag::err_operator_overload_post_incdec_must_be_int) |
13460 | << LastParam->getType() << (Op == OO_MinusMinus); |
13461 | } |
13462 | |
13463 | return false; |
13464 | } |
13465 | |
13466 | static bool |
13467 | checkLiteralOperatorTemplateParameterList(Sema &SemaRef, |
13468 | FunctionTemplateDecl *TpDecl) { |
13469 | TemplateParameterList *TemplateParams = TpDecl->getTemplateParameters(); |
13470 | |
13471 | // Must have one or two template parameters. |
13472 | if (TemplateParams->size() == 1) { |
13473 | NonTypeTemplateParmDecl *PmDecl = |
13474 | dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(0)); |
13475 | |
13476 | // The template parameter must be a char parameter pack. |
13477 | if (PmDecl && PmDecl->isTemplateParameterPack() && |
13478 | SemaRef.Context.hasSameType(PmDecl->getType(), SemaRef.Context.CharTy)) |
13479 | return false; |
13480 | |
13481 | } else if (TemplateParams->size() == 2) { |
13482 | TemplateTypeParmDecl *PmType = |
13483 | dyn_cast<TemplateTypeParmDecl>(TemplateParams->getParam(0)); |
13484 | NonTypeTemplateParmDecl *PmArgs = |
13485 | dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(1)); |
13486 | |
13487 | // The second template parameter must be a parameter pack with the |
13488 | // first template parameter as its type. |
13489 | if (PmType && PmArgs && !PmType->isTemplateParameterPack() && |
13490 | PmArgs->isTemplateParameterPack()) { |
13491 | const TemplateTypeParmType *TArgs = |
13492 | PmArgs->getType()->getAs<TemplateTypeParmType>(); |
13493 | if (TArgs && TArgs->getDepth() == PmType->getDepth() && |
13494 | TArgs->getIndex() == PmType->getIndex()) { |
13495 | if (!SemaRef.inTemplateInstantiation()) |
13496 | SemaRef.Diag(TpDecl->getLocation(), |
13497 | diag::ext_string_literal_operator_template); |
13498 | return false; |
13499 | } |
13500 | } |
13501 | } |
13502 | |
13503 | SemaRef.Diag(TpDecl->getTemplateParameters()->getSourceRange().getBegin(), |
13504 | diag::err_literal_operator_template) |
13505 | << TpDecl->getTemplateParameters()->getSourceRange(); |
13506 | return true; |
13507 | } |
13508 | |
13509 | /// CheckLiteralOperatorDeclaration - Check whether the declaration |
13510 | /// of this literal operator function is well-formed. If so, returns |
13511 | /// false; otherwise, emits appropriate diagnostics and returns true. |
13512 | bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { |
13513 | if (isa<CXXMethodDecl>(FnDecl)) { |
13514 | Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) |
13515 | << FnDecl->getDeclName(); |
13516 | return true; |
13517 | } |
13518 | |
13519 | if (FnDecl->isExternC()) { |
13520 | Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); |
13521 | if (const LinkageSpecDecl *LSD = |
13522 | FnDecl->getDeclContext()->getExternCContext()) |
13523 | Diag(LSD->getExternLoc(), diag::note_extern_c_begins_here); |
13524 | return true; |
13525 | } |
13526 | |
13527 | // This might be the definition of a literal operator template. |
13528 | FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); |
13529 | |
13530 | // This might be a specialization of a literal operator template. |
13531 | if (!TpDecl) |
13532 | TpDecl = FnDecl->getPrimaryTemplate(); |
13533 | |
13534 | // template <char...> type operator "" name() and |
13535 | // template <class T, T...> type operator "" name() are the only valid |
13536 | // template signatures, and the only valid signatures with no parameters. |
13537 | if (TpDecl) { |
13538 | if (FnDecl->param_size() != 0) { |
13539 | Diag(FnDecl->getLocation(), |
13540 | diag::err_literal_operator_template_with_params); |
13541 | return true; |
13542 | } |
13543 | |
13544 | if (checkLiteralOperatorTemplateParameterList(*this, TpDecl)) |
13545 | return true; |
13546 | |
13547 | } else if (FnDecl->param_size() == 1) { |
13548 | const ParmVarDecl *Param = FnDecl->getParamDecl(0); |
13549 | |
13550 | QualType ParamType = Param->getType().getUnqualifiedType(); |
13551 | |
13552 | // Only unsigned long long int, long double, any character type, and const |
13553 | // char * are allowed as the only parameters. |
13554 | if (ParamType->isSpecificBuiltinType(BuiltinType::ULongLong) || |
13555 | ParamType->isSpecificBuiltinType(BuiltinType::LongDouble) || |
13556 | Context.hasSameType(ParamType, Context.CharTy) || |
13557 | Context.hasSameType(ParamType, Context.WideCharTy) || |
13558 | Context.hasSameType(ParamType, Context.Char8Ty) || |
13559 | Context.hasSameType(ParamType, Context.Char16Ty) || |
13560 | Context.hasSameType(ParamType, Context.Char32Ty)) { |
13561 | } else if (const PointerType *Ptr = ParamType->getAs<PointerType>()) { |
13562 | QualType InnerType = Ptr->getPointeeType(); |
13563 | |
13564 | // Pointer parameter must be a const char *. |
13565 | if (!(Context.hasSameType(InnerType.getUnqualifiedType(), |
13566 | Context.CharTy) && |
13567 | InnerType.isConstQualified() && !InnerType.isVolatileQualified())) { |
13568 | Diag(Param->getSourceRange().getBegin(), |
13569 | diag::err_literal_operator_param) |
13570 | << ParamType << "'const char *'" << Param->getSourceRange(); |
13571 | return true; |
13572 | } |
13573 | |
13574 | } else if (ParamType->isRealFloatingType()) { |
13575 | Diag(Param->getSourceRange().getBegin(), diag::err_literal_operator_param) |
13576 | << ParamType << Context.LongDoubleTy << Param->getSourceRange(); |
13577 | return true; |
13578 | |
13579 | } else if (ParamType->isIntegerType()) { |
13580 | Diag(Param->getSourceRange().getBegin(), diag::err_literal_operator_param) |
13581 | << ParamType << Context.UnsignedLongLongTy << Param->getSourceRange(); |
13582 | return true; |
13583 | |
13584 | } else { |
13585 | Diag(Param->getSourceRange().getBegin(), |
13586 | diag::err_literal_operator_invalid_param) |
13587 | << ParamType << Param->getSourceRange(); |
13588 | return true; |
13589 | } |
13590 | |
13591 | } else if (FnDecl->param_size() == 2) { |
13592 | FunctionDecl::param_iterator Param = FnDecl->param_begin(); |
13593 | |
13594 | // First, verify that the first parameter is correct. |
13595 | |
13596 | QualType FirstParamType = (*Param)->getType().getUnqualifiedType(); |
13597 | |
13598 | // Two parameter function must have a pointer to const as a |
13599 | // first parameter; let's strip those qualifiers. |
13600 | const PointerType *PT = FirstParamType->getAs<PointerType>(); |
13601 | |
13602 | if (!PT) { |
13603 | Diag((*Param)->getSourceRange().getBegin(), |
13604 | diag::err_literal_operator_param) |
13605 | << FirstParamType << "'const char *'" << (*Param)->getSourceRange(); |
13606 | return true; |
13607 | } |
13608 | |
13609 | QualType PointeeType = PT->getPointeeType(); |
13610 | // First parameter must be const |
13611 | if (!PointeeType.isConstQualified() || PointeeType.isVolatileQualified()) { |
13612 | Diag((*Param)->getSourceRange().getBegin(), |
13613 | diag::err_literal_operator_param) |
13614 | << FirstParamType << "'const char *'" << (*Param)->getSourceRange(); |
13615 | return true; |
13616 | } |
13617 | |
13618 | QualType InnerType = PointeeType.getUnqualifiedType(); |
13619 | // Only const char *, const wchar_t*, const char8_t*, const char16_t*, and |
13620 | // const char32_t* are allowed as the first parameter to a two-parameter |
13621 | // function |
13622 | if (!(Context.hasSameType(InnerType, Context.CharTy) || |
13623 | Context.hasSameType(InnerType, Context.WideCharTy) || |
13624 | Context.hasSameType(InnerType, Context.Char8Ty) || |
13625 | Context.hasSameType(InnerType, Context.Char16Ty) || |
13626 | Context.hasSameType(InnerType, Context.Char32Ty))) { |
13627 | Diag((*Param)->getSourceRange().getBegin(), |
13628 | diag::err_literal_operator_param) |
13629 | << FirstParamType << "'const char *'" << (*Param)->getSourceRange(); |
13630 | return true; |
13631 | } |
13632 | |
13633 | // Move on to the second and final parameter. |
13634 | ++Param; |
13635 | |
13636 | // The second parameter must be a std::size_t. |
13637 | QualType SecondParamType = (*Param)->getType().getUnqualifiedType(); |
13638 | if (!Context.hasSameType(SecondParamType, Context.getSizeType())) { |
13639 | Diag((*Param)->getSourceRange().getBegin(), |
13640 | diag::err_literal_operator_param) |
13641 | << SecondParamType << Context.getSizeType() |
13642 | << (*Param)->getSourceRange(); |
13643 | return true; |
13644 | } |
13645 | } else { |
13646 | Diag(FnDecl->getLocation(), diag::err_literal_operator_bad_param_count); |
13647 | return true; |
13648 | } |
13649 | |
13650 | // Parameters are good. |
13651 | |
13652 | // A parameter-declaration-clause containing a default argument is not |
13653 | // equivalent to any of the permitted forms. |
13654 | for (auto Param : FnDecl->parameters()) { |
13655 | if (Param->hasDefaultArg()) { |
13656 | Diag(Param->getDefaultArgRange().getBegin(), |
13657 | diag::err_literal_operator_default_argument) |
13658 | << Param->getDefaultArgRange(); |
13659 | break; |
13660 | } |
13661 | } |
13662 | |
13663 | StringRef LiteralName |
13664 | = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); |
13665 | if (LiteralName[0] != '_' && |
13666 | !getSourceManager().isInSystemHeader(FnDecl->getLocation())) { |
13667 | // C++11 [usrlit.suffix]p1: |
13668 | // Literal suffix identifiers that do not start with an underscore |
13669 | // are reserved for future standardization. |
13670 | Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved) |
13671 | << StringLiteralParser::isValidUDSuffix(getLangOpts(), LiteralName); |
13672 | } |
13673 | |
13674 | return false; |
13675 | } |
13676 | |
13677 | /// ActOnStartLinkageSpecification - Parsed the beginning of a C++ |
13678 | /// linkage specification, including the language and (if present) |
13679 | /// the '{'. ExternLoc is the location of the 'extern', Lang is the |
13680 | /// language string literal. LBraceLoc, if valid, provides the location of |
13681 | /// the '{' brace. Otherwise, this linkage specification does not |
13682 | /// have any braces. |
13683 | Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, |
13684 | Expr *LangStr, |
13685 | SourceLocation LBraceLoc) { |
13686 | StringLiteral *Lit = cast<StringLiteral>(LangStr); |
13687 | if (!Lit->isAscii()) { |
13688 | Diag(LangStr->getExprLoc(), diag::err_language_linkage_spec_not_ascii) |
13689 | << LangStr->getSourceRange(); |
13690 | return nullptr; |
13691 | } |
13692 | |
13693 | StringRef Lang = Lit->getString(); |
13694 | LinkageSpecDecl::LanguageIDs Language; |
13695 | if (Lang == "C") |
13696 | Language = LinkageSpecDecl::lang_c; |
13697 | else if (Lang == "C++") |
13698 | Language = LinkageSpecDecl::lang_cxx; |
13699 | else { |
13700 | Diag(LangStr->getExprLoc(), diag::err_language_linkage_spec_unknown) |
13701 | << LangStr->getSourceRange(); |
13702 | return nullptr; |
13703 | } |
13704 | |
13705 | // FIXME: Add all the various semantics of linkage specifications |
13706 | |
13707 | LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, ExternLoc, |
13708 | LangStr->getExprLoc(), Language, |
13709 | LBraceLoc.isValid()); |
13710 | CurContext->addDecl(D); |
13711 | PushDeclContext(S, D); |
13712 | return D; |
13713 | } |
13714 | |
13715 | /// ActOnFinishLinkageSpecification - Complete the definition of |
13716 | /// the C++ linkage specification LinkageSpec. If RBraceLoc is |
13717 | /// valid, it's the position of the closing '}' brace in a linkage |
13718 | /// specification that uses braces. |
13719 | Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, |
13720 | Decl *LinkageSpec, |
13721 | SourceLocation RBraceLoc) { |
13722 | if (RBraceLoc.isValid()) { |
13723 | LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); |
13724 | LSDecl->setRBraceLoc(RBraceLoc); |
13725 | } |
13726 | PopDeclContext(); |
13727 | return LinkageSpec; |
13728 | } |
13729 | |
13730 | Decl *Sema::ActOnEmptyDeclaration(Scope *S, |
13731 | const ParsedAttributesView &AttrList, |
13732 | SourceLocation SemiLoc) { |
13733 | Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc); |
13734 | // Attribute declarations appertain to empty declaration so we handle |
13735 | // them here. |
13736 | ProcessDeclAttributeList(S, ED, AttrList); |
13737 | |
13738 | CurContext->addDecl(ED); |
13739 | return ED; |
13740 | } |
13741 | |
13742 | /// Perform semantic analysis for the variable declaration that |
13743 | /// occurs within a C++ catch clause, returning the newly-created |
13744 | /// variable. |
13745 | VarDecl *Sema::BuildExceptionDeclaration(Scope *S, |
13746 | TypeSourceInfo *TInfo, |
13747 | SourceLocation StartLoc, |
13748 | SourceLocation Loc, |
13749 | IdentifierInfo *Name) { |
13750 | bool Invalid = false; |
13751 | QualType ExDeclType = TInfo->getType(); |
13752 | |
13753 | // Arrays and functions decay. |
13754 | if (ExDeclType->isArrayType()) |
13755 | ExDeclType = Context.getArrayDecayedType(ExDeclType); |
13756 | else if (ExDeclType->isFunctionType()) |
13757 | ExDeclType = Context.getPointerType(ExDeclType); |
13758 | |
13759 | // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. |
13760 | // The exception-declaration shall not denote a pointer or reference to an |
13761 | // incomplete type, other than [cv] void*. |
13762 | // N2844 forbids rvalue references. |
13763 | if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { |
13764 | Diag(Loc, diag::err_catch_rvalue_ref); |
13765 | Invalid = true; |
13766 | } |
13767 | |
13768 | if (ExDeclType->isVariablyModifiedType()) { |
13769 | Diag(Loc, diag::err_catch_variably_modified) << ExDeclType; |
13770 | Invalid = true; |
13771 | } |
13772 | |
13773 | QualType BaseType = ExDeclType; |
13774 | int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference |
13775 | unsigned DK = diag::err_catch_incomplete; |
13776 | if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { |
13777 | BaseType = Ptr->getPointeeType(); |
13778 | Mode = 1; |
13779 | DK = diag::err_catch_incomplete_ptr; |
13780 | } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { |
13781 | // For the purpose of error recovery, we treat rvalue refs like lvalue refs. |
13782 | BaseType = Ref->getPointeeType(); |
13783 | Mode = 2; |
13784 | DK = diag::err_catch_incomplete_ref; |
13785 | } |
13786 | if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && |
13787 | !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) |
13788 | Invalid = true; |
13789 | |
13790 | if (!Invalid && !ExDeclType->isDependentType() && |
13791 | RequireNonAbstractType(Loc, ExDeclType, |
13792 | diag::err_abstract_type_in_decl, |
13793 | AbstractVariableType)) |
13794 | Invalid = true; |
13795 | |
13796 | // Only the non-fragile NeXT runtime currently supports C++ catches |
13797 | // of ObjC types, and no runtime supports catching ObjC types by value. |
13798 | if (!Invalid && getLangOpts().ObjC) { |
13799 | QualType T = ExDeclType; |
13800 | if (const ReferenceType *RT = T->getAs<ReferenceType>()) |
13801 | T = RT->getPointeeType(); |
13802 | |
13803 | if (T->isObjCObjectType()) { |
13804 | Diag(Loc, diag::err_objc_object_catch); |
13805 | Invalid = true; |
13806 | } else if (T->isObjCObjectPointerType()) { |
13807 | // FIXME: should this be a test for macosx-fragile specifically? |
13808 | if (getLangOpts().ObjCRuntime.isFragile()) |
13809 | Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); |
13810 | } |
13811 | } |
13812 | |
13813 | VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, |
13814 | ExDeclType, TInfo, SC_None); |
13815 | ExDecl->setExceptionVariable(true); |
13816 | |
13817 | // In ARC, infer 'retaining' for variables of retainable type. |
13818 | if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) |
13819 | Invalid = true; |
13820 | |
13821 | if (!Invalid && !ExDeclType->isDependentType()) { |
13822 | if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { |
13823 | // Insulate this from anything else we might currently be parsing. |
13824 | EnterExpressionEvaluationContext scope( |
13825 | *this, ExpressionEvaluationContext::PotentiallyEvaluated); |
13826 | |
13827 | // C++ [except.handle]p16: |
13828 | // The object declared in an exception-declaration or, if the |
13829 | // exception-declaration does not specify a name, a temporary (12.2) is |
13830 | // copy-initialized (8.5) from the exception object. [...] |
13831 | // The object is destroyed when the handler exits, after the destruction |
13832 | // of any automatic objects initialized within the handler. |
13833 | // |
13834 | // We just pretend to initialize the object with itself, then make sure |
13835 | // it can be destroyed later. |
13836 | QualType initType = Context.getExceptionObjectType(ExDeclType); |
13837 | |
13838 | InitializedEntity entity = |
13839 | InitializedEntity::InitializeVariable(ExDecl); |
13840 | InitializationKind initKind = |
13841 | InitializationKind::CreateCopy(Loc, SourceLocation()); |
13842 | |
13843 | Expr *opaqueValue = |
13844 | new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); |
13845 | InitializationSequence sequence(*this, entity, initKind, opaqueValue); |
13846 | ExprResult result = sequence.Perform(*this, entity, initKind, opaqueValue); |
13847 | if (result.isInvalid()) |
13848 | Invalid = true; |
13849 | else { |
13850 | // If the constructor used was non-trivial, set this as the |
13851 | // "initializer". |
13852 | CXXConstructExpr *construct = result.getAs<CXXConstructExpr>(); |
13853 | if (!construct->getConstructor()->isTrivial()) { |
13854 | Expr *init = MaybeCreateExprWithCleanups(construct); |
13855 | ExDecl->setInit(init); |
13856 | } |
13857 | |
13858 | // And make sure it's destructable. |
13859 | FinalizeVarWithDestructor(ExDecl, recordType); |
13860 | } |
13861 | } |
13862 | } |
13863 | |
13864 | if (Invalid) |
13865 | ExDecl->setInvalidDecl(); |
13866 | |
13867 | return ExDecl; |
13868 | } |
13869 | |
13870 | /// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch |
13871 | /// handler. |
13872 | Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { |
13873 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); |
13874 | bool Invalid = D.isInvalidType(); |
13875 | |
13876 | // Check for unexpanded parameter packs. |
13877 | if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, |
13878 | UPPC_ExceptionType)) { |
13879 | TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, |
13880 | D.getIdentifierLoc()); |
13881 | Invalid = true; |
13882 | } |
13883 | |
13884 | IdentifierInfo *II = D.getIdentifier(); |
13885 | if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), |
13886 | LookupOrdinaryName, |
13887 | ForVisibleRedeclaration)) { |
13888 | // The scope should be freshly made just for us. There is just no way |
13889 | // it contains any previous declaration, except for function parameters in |
13890 | // a function-try-block's catch statement. |
13891 | assert(!S->isDeclScope(PrevDecl))((!S->isDeclScope(PrevDecl)) ? static_cast<void> (0) : __assert_fail ("!S->isDeclScope(PrevDecl)", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 13891, __PRETTY_FUNCTION__)); |
13892 | if (isDeclInScope(PrevDecl, CurContext, S)) { |
13893 | Diag(D.getIdentifierLoc(), diag::err_redefinition) |
13894 | << D.getIdentifier(); |
13895 | Diag(PrevDecl->getLocation(), diag::note_previous_definition); |
13896 | Invalid = true; |
13897 | } else if (PrevDecl->isTemplateParameter()) |
13898 | // Maybe we will complain about the shadowed template parameter. |
13899 | DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); |
13900 | } |
13901 | |
13902 | if (D.getCXXScopeSpec().isSet() && !Invalid) { |
13903 | Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) |
13904 | << D.getCXXScopeSpec().getRange(); |
13905 | Invalid = true; |
13906 | } |
13907 | |
13908 | VarDecl *ExDecl = BuildExceptionDeclaration( |
13909 | S, TInfo, D.getBeginLoc(), D.getIdentifierLoc(), D.getIdentifier()); |
13910 | if (Invalid) |
13911 | ExDecl->setInvalidDecl(); |
13912 | |
13913 | // Add the exception declaration into this scope. |
13914 | if (II) |
13915 | PushOnScopeChains(ExDecl, S); |
13916 | else |
13917 | CurContext->addDecl(ExDecl); |
13918 | |
13919 | ProcessDeclAttributes(S, ExDecl, D); |
13920 | return ExDecl; |
13921 | } |
13922 | |
13923 | Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, |
13924 | Expr *AssertExpr, |
13925 | Expr *AssertMessageExpr, |
13926 | SourceLocation RParenLoc) { |
13927 | StringLiteral *AssertMessage = |
13928 | AssertMessageExpr ? cast<StringLiteral>(AssertMessageExpr) : nullptr; |
13929 | |
13930 | if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) |
13931 | return nullptr; |
13932 | |
13933 | return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, |
13934 | AssertMessage, RParenLoc, false); |
13935 | } |
13936 | |
13937 | Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, |
13938 | Expr *AssertExpr, |
13939 | StringLiteral *AssertMessage, |
13940 | SourceLocation RParenLoc, |
13941 | bool Failed) { |
13942 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 13942, __PRETTY_FUNCTION__)); |
13943 | if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && |
13944 | !Failed) { |
13945 | // In a static_assert-declaration, the constant-expression shall be a |
13946 | // constant expression that can be contextually converted to bool. |
13947 | ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); |
13948 | if (Converted.isInvalid()) |
13949 | Failed = true; |
13950 | else |
13951 | Converted = ConstantExpr::Create(Context, Converted.get()); |
13952 | |
13953 | llvm::APSInt Cond; |
13954 | if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, |
13955 | diag::err_static_assert_expression_is_not_constant, |
13956 | /*AllowFold=*/false).isInvalid()) |
13957 | Failed = true; |
13958 | |
13959 | if (!Failed && !Cond) { |
13960 | SmallString<256> MsgBuffer; |
13961 | llvm::raw_svector_ostream Msg(MsgBuffer); |
13962 | if (AssertMessage) |
13963 | AssertMessage->printPretty(Msg, nullptr, getPrintingPolicy()); |
13964 | |
13965 | Expr *InnerCond = nullptr; |
13966 | std::string InnerCondDescription; |
13967 | std::tie(InnerCond, InnerCondDescription) = |
13968 | findFailedBooleanCondition(Converted.get()); |
13969 | if (InnerCond && !isa<CXXBoolLiteralExpr>(InnerCond) |
13970 | && !isa<IntegerLiteral>(InnerCond)) { |
13971 | Diag(StaticAssertLoc, diag::err_static_assert_requirement_failed) |
13972 | << InnerCondDescription << !AssertMessage |
13973 | << Msg.str() << InnerCond->getSourceRange(); |
13974 | } else { |
13975 | Diag(StaticAssertLoc, diag::err_static_assert_failed) |
13976 | << !AssertMessage << Msg.str() << AssertExpr->getSourceRange(); |
13977 | } |
13978 | Failed = true; |
13979 | } |
13980 | } |
13981 | |
13982 | ExprResult FullAssertExpr = ActOnFinishFullExpr(AssertExpr, StaticAssertLoc, |
13983 | /*DiscardedValue*/false, |
13984 | /*IsConstexpr*/true); |
13985 | if (FullAssertExpr.isInvalid()) |
13986 | Failed = true; |
13987 | else |
13988 | AssertExpr = FullAssertExpr.get(); |
13989 | |
13990 | Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, |
13991 | AssertExpr, AssertMessage, RParenLoc, |
13992 | Failed); |
13993 | |
13994 | CurContext->addDecl(Decl); |
13995 | return Decl; |
13996 | } |
13997 | |
13998 | /// Perform semantic analysis of the given friend type declaration. |
13999 | /// |
14000 | /// \returns A friend declaration that. |
14001 | FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, |
14002 | SourceLocation FriendLoc, |
14003 | TypeSourceInfo *TSInfo) { |
14004 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 14004, __PRETTY_FUNCTION__)); |
14005 | |
14006 | QualType T = TSInfo->getType(); |
14007 | SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); |
14008 | |
14009 | // C++03 [class.friend]p2: |
14010 | // An elaborated-type-specifier shall be used in a friend declaration |
14011 | // for a class.* |
14012 | // |
14013 | // * The class-key of the elaborated-type-specifier is required. |
14014 | if (!CodeSynthesisContexts.empty()) { |
14015 | // Do not complain about the form of friend template types during any kind |
14016 | // of code synthesis. For template instantiation, we will have complained |
14017 | // when the template was defined. |
14018 | } else { |
14019 | if (!T->isElaboratedTypeSpecifier()) { |
14020 | // If we evaluated the type to a record type, suggest putting |
14021 | // a tag in front. |
14022 | if (const RecordType *RT = T->getAs<RecordType>()) { |
14023 | RecordDecl *RD = RT->getDecl(); |
14024 | |
14025 | SmallString<16> InsertionText(" "); |
14026 | InsertionText += RD->getKindName(); |
14027 | |
14028 | Diag(TypeRange.getBegin(), |
14029 | getLangOpts().CPlusPlus11 ? |
14030 | diag::warn_cxx98_compat_unelaborated_friend_type : |
14031 | diag::ext_unelaborated_friend_type) |
14032 | << (unsigned) RD->getTagKind() |
14033 | << T |
14034 | << FixItHint::CreateInsertion(getLocForEndOfToken(FriendLoc), |
14035 | InsertionText); |
14036 | } else { |
14037 | Diag(FriendLoc, |
14038 | getLangOpts().CPlusPlus11 ? |
14039 | diag::warn_cxx98_compat_nonclass_type_friend : |
14040 | diag::ext_nonclass_type_friend) |
14041 | << T |
14042 | << TypeRange; |
14043 | } |
14044 | } else if (T->getAs<EnumType>()) { |
14045 | Diag(FriendLoc, |
14046 | getLangOpts().CPlusPlus11 ? |
14047 | diag::warn_cxx98_compat_enum_friend : |
14048 | diag::ext_enum_friend) |
14049 | << T |
14050 | << TypeRange; |
14051 | } |
14052 | |
14053 | // C++11 [class.friend]p3: |
14054 | // A friend declaration that does not declare a function shall have one |
14055 | // of the following forms: |
14056 | // friend elaborated-type-specifier ; |
14057 | // friend simple-type-specifier ; |
14058 | // friend typename-specifier ; |
14059 | if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc) |
14060 | Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; |
14061 | } |
14062 | |
14063 | // If the type specifier in a friend declaration designates a (possibly |
14064 | // cv-qualified) class type, that class is declared as a friend; otherwise, |
14065 | // the friend declaration is ignored. |
14066 | return FriendDecl::Create(Context, CurContext, |
14067 | TSInfo->getTypeLoc().getBeginLoc(), TSInfo, |
14068 | FriendLoc); |
14069 | } |
14070 | |
14071 | /// Handle a friend tag declaration where the scope specifier was |
14072 | /// templated. |
14073 | Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, |
14074 | unsigned TagSpec, SourceLocation TagLoc, |
14075 | CXXScopeSpec &SS, IdentifierInfo *Name, |
14076 | SourceLocation NameLoc, |
14077 | const ParsedAttributesView &Attr, |
14078 | MultiTemplateParamsArg TempParamLists) { |
14079 | TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); |
14080 | |
14081 | bool IsMemberSpecialization = false; |
14082 | bool Invalid = false; |
14083 | |
14084 | if (TemplateParameterList *TemplateParams = |
14085 | MatchTemplateParametersToScopeSpecifier( |
14086 | TagLoc, NameLoc, SS, nullptr, TempParamLists, /*friend*/ true, |
14087 | IsMemberSpecialization, Invalid)) { |
14088 | if (TemplateParams->size() > 0) { |
14089 | // This is a declaration of a class template. |
14090 | if (Invalid) |
14091 | return nullptr; |
14092 | |
14093 | return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, SS, Name, |
14094 | NameLoc, Attr, TemplateParams, AS_public, |
14095 | /*ModulePrivateLoc=*/SourceLocation(), |
14096 | FriendLoc, TempParamLists.size() - 1, |
14097 | TempParamLists.data()).get(); |
14098 | } else { |
14099 | // The "template<>" header is extraneous. |
14100 | Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) |
14101 | << TypeWithKeyword::getTagTypeKindName(Kind) << Name; |
14102 | IsMemberSpecialization = true; |
14103 | } |
14104 | } |
14105 | |
14106 | if (Invalid) return nullptr; |
14107 | |
14108 | bool isAllExplicitSpecializations = true; |
14109 | for (unsigned I = TempParamLists.size(); I-- > 0; ) { |
14110 | if (TempParamLists[I]->size()) { |
14111 | isAllExplicitSpecializations = false; |
14112 | break; |
14113 | } |
14114 | } |
14115 | |
14116 | // FIXME: don't ignore attributes. |
14117 | |
14118 | // If it's explicit specializations all the way down, just forget |
14119 | // about the template header and build an appropriate non-templated |
14120 | // friend. TODO: for source fidelity, remember the headers. |
14121 | if (isAllExplicitSpecializations) { |
14122 | if (SS.isEmpty()) { |
14123 | bool Owned = false; |
14124 | bool IsDependent = false; |
14125 | return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, |
14126 | Attr, AS_public, |
14127 | /*ModulePrivateLoc=*/SourceLocation(), |
14128 | MultiTemplateParamsArg(), Owned, IsDependent, |
14129 | /*ScopedEnumKWLoc=*/SourceLocation(), |
14130 | /*ScopedEnumUsesClassTag=*/false, |
14131 | /*UnderlyingType=*/TypeResult(), |
14132 | /*IsTypeSpecifier=*/false, |
14133 | /*IsTemplateParamOrArg=*/false); |
14134 | } |
14135 | |
14136 | NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); |
14137 | ElaboratedTypeKeyword Keyword |
14138 | = TypeWithKeyword::getKeywordForTagTypeKind(Kind); |
14139 | QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, |
14140 | *Name, NameLoc); |
14141 | if (T.isNull()) |
14142 | return nullptr; |
14143 | |
14144 | TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); |
14145 | if (isa<DependentNameType>(T)) { |
14146 | DependentNameTypeLoc TL = |
14147 | TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); |
14148 | TL.setElaboratedKeywordLoc(TagLoc); |
14149 | TL.setQualifierLoc(QualifierLoc); |
14150 | TL.setNameLoc(NameLoc); |
14151 | } else { |
14152 | ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>(); |
14153 | TL.setElaboratedKeywordLoc(TagLoc); |
14154 | TL.setQualifierLoc(QualifierLoc); |
14155 | TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc); |
14156 | } |
14157 | |
14158 | FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, |
14159 | TSI, FriendLoc, TempParamLists); |
14160 | Friend->setAccess(AS_public); |
14161 | CurContext->addDecl(Friend); |
14162 | return Friend; |
14163 | } |
14164 | |
14165 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 14165, __PRETTY_FUNCTION__)); |
14166 | |
14167 | |
14168 | |
14169 | // Handle the case of a templated-scope friend class. e.g. |
14170 | // template <class T> class A<T>::B; |
14171 | // FIXME: we don't support these right now. |
14172 | Diag(NameLoc, diag::warn_template_qualified_friend_unsupported) |
14173 | << SS.getScopeRep() << SS.getRange() << cast<CXXRecordDecl>(CurContext); |
14174 | ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); |
14175 | QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); |
14176 | TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); |
14177 | DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); |
14178 | TL.setElaboratedKeywordLoc(TagLoc); |
14179 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); |
14180 | TL.setNameLoc(NameLoc); |
14181 | |
14182 | FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, |
14183 | TSI, FriendLoc, TempParamLists); |
14184 | Friend->setAccess(AS_public); |
14185 | Friend->setUnsupportedFriend(true); |
14186 | CurContext->addDecl(Friend); |
14187 | return Friend; |
14188 | } |
14189 | |
14190 | /// Handle a friend type declaration. This works in tandem with |
14191 | /// ActOnTag. |
14192 | /// |
14193 | /// Notes on friend class templates: |
14194 | /// |
14195 | /// We generally treat friend class declarations as if they were |
14196 | /// declaring a class. So, for example, the elaborated type specifier |
14197 | /// in a friend declaration is required to obey the restrictions of a |
14198 | /// class-head (i.e. no typedefs in the scope chain), template |
14199 | /// parameters are required to match up with simple template-ids, &c. |
14200 | /// However, unlike when declaring a template specialization, it's |
14201 | /// okay to refer to a template specialization without an empty |
14202 | /// template parameter declaration, e.g. |
14203 | /// friend class A<T>::B<unsigned>; |
14204 | /// We permit this as a special case; if there are any template |
14205 | /// parameters present at all, require proper matching, i.e. |
14206 | /// template <> template \<class T> friend class A<int>::B; |
14207 | Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, |
14208 | MultiTemplateParamsArg TempParams) { |
14209 | SourceLocation Loc = DS.getBeginLoc(); |
14210 | |
14211 | assert(DS.isFriendSpecified())((DS.isFriendSpecified()) ? static_cast<void> (0) : __assert_fail ("DS.isFriendSpecified()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 14211, __PRETTY_FUNCTION__)); |
14212 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 14212, __PRETTY_FUNCTION__)); |
14213 | |
14214 | // C++ [class.friend]p3: |
14215 | // A friend declaration that does not declare a function shall have one of |
14216 | // the following forms: |
14217 | // friend elaborated-type-specifier ; |
14218 | // friend simple-type-specifier ; |
14219 | // friend typename-specifier ; |
14220 | // |
14221 | // Any declaration with a type qualifier does not have that form. (It's |
14222 | // legal to specify a qualified type as a friend, you just can't write the |
14223 | // keywords.) |
14224 | if (DS.getTypeQualifiers()) { |
14225 | if (DS.getTypeQualifiers() & DeclSpec::TQ_const) |
14226 | Diag(DS.getConstSpecLoc(), diag::err_friend_decl_spec) << "const"; |
14227 | if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) |
14228 | Diag(DS.getVolatileSpecLoc(), diag::err_friend_decl_spec) << "volatile"; |
14229 | if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) |
14230 | Diag(DS.getRestrictSpecLoc(), diag::err_friend_decl_spec) << "restrict"; |
14231 | if (DS.getTypeQualifiers() & DeclSpec::TQ_atomic) |
14232 | Diag(DS.getAtomicSpecLoc(), diag::err_friend_decl_spec) << "_Atomic"; |
14233 | if (DS.getTypeQualifiers() & DeclSpec::TQ_unaligned) |
14234 | Diag(DS.getUnalignedSpecLoc(), diag::err_friend_decl_spec) << "__unaligned"; |
14235 | } |
14236 | |
14237 | // Try to convert the decl specifier to a type. This works for |
14238 | // friend templates because ActOnTag never produces a ClassTemplateDecl |
14239 | // for a TUK_Friend. |
14240 | Declarator TheDeclarator(DS, DeclaratorContext::MemberContext); |
14241 | TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); |
14242 | QualType T = TSI->getType(); |
14243 | if (TheDeclarator.isInvalidType()) |
14244 | return nullptr; |
14245 | |
14246 | if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) |
14247 | return nullptr; |
14248 | |
14249 | // This is definitely an error in C++98. It's probably meant to |
14250 | // be forbidden in C++0x, too, but the specification is just |
14251 | // poorly written. |
14252 | // |
14253 | // The problem is with declarations like the following: |
14254 | // template <T> friend A<T>::foo; |
14255 | // where deciding whether a class C is a friend or not now hinges |
14256 | // on whether there exists an instantiation of A that causes |
14257 | // 'foo' to equal C. There are restrictions on class-heads |
14258 | // (which we declare (by fiat) elaborated friend declarations to |
14259 | // be) that makes this tractable. |
14260 | // |
14261 | // FIXME: handle "template <> friend class A<T>;", which |
14262 | // is possibly well-formed? Who even knows? |
14263 | if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { |
14264 | Diag(Loc, diag::err_tagless_friend_type_template) |
14265 | << DS.getSourceRange(); |
14266 | return nullptr; |
14267 | } |
14268 | |
14269 | // C++98 [class.friend]p1: A friend of a class is a function |
14270 | // or class that is not a member of the class . . . |
14271 | // This is fixed in DR77, which just barely didn't make the C++03 |
14272 | // deadline. It's also a very silly restriction that seriously |
14273 | // affects inner classes and which nobody else seems to implement; |
14274 | // thus we never diagnose it, not even in -pedantic. |
14275 | // |
14276 | // But note that we could warn about it: it's always useless to |
14277 | // friend one of your own members (it's not, however, worthless to |
14278 | // friend a member of an arbitrary specialization of your template). |
14279 | |
14280 | Decl *D; |
14281 | if (!TempParams.empty()) |
14282 | D = FriendTemplateDecl::Create(Context, CurContext, Loc, |
14283 | TempParams, |
14284 | TSI, |
14285 | DS.getFriendSpecLoc()); |
14286 | else |
14287 | D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); |
14288 | |
14289 | if (!D) |
14290 | return nullptr; |
14291 | |
14292 | D->setAccess(AS_public); |
14293 | CurContext->addDecl(D); |
14294 | |
14295 | return D; |
14296 | } |
14297 | |
14298 | NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, |
14299 | MultiTemplateParamsArg TemplateParams) { |
14300 | const DeclSpec &DS = D.getDeclSpec(); |
14301 | |
14302 | assert(DS.isFriendSpecified())((DS.isFriendSpecified()) ? static_cast<void> (0) : __assert_fail ("DS.isFriendSpecified()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 14302, __PRETTY_FUNCTION__)); |
14303 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 14303, __PRETTY_FUNCTION__)); |
14304 | |
14305 | SourceLocation Loc = D.getIdentifierLoc(); |
14306 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); |
14307 | |
14308 | // C++ [class.friend]p1 |
14309 | // A friend of a class is a function or class.... |
14310 | // Note that this sees through typedefs, which is intended. |
14311 | // It *doesn't* see through dependent types, which is correct |
14312 | // according to [temp.arg.type]p3: |
14313 | // If a declaration acquires a function type through a |
14314 | // type dependent on a template-parameter and this causes |
14315 | // a declaration that does not use the syntactic form of a |
14316 | // function declarator to have a function type, the program |
14317 | // is ill-formed. |
14318 | if (!TInfo->getType()->isFunctionType()) { |
14319 | Diag(Loc, diag::err_unexpected_friend); |
14320 | |
14321 | // It might be worthwhile to try to recover by creating an |
14322 | // appropriate declaration. |
14323 | return nullptr; |
14324 | } |
14325 | |
14326 | // C++ [namespace.memdef]p3 |
14327 | // - If a friend declaration in a non-local class first declares a |
14328 | // class or function, the friend class or function is a member |
14329 | // of the innermost enclosing namespace. |
14330 | // - The name of the friend is not found by simple name lookup |
14331 | // until a matching declaration is provided in that namespace |
14332 | // scope (either before or after the class declaration granting |
14333 | // friendship). |
14334 | // - If a friend function is called, its name may be found by the |
14335 | // name lookup that considers functions from namespaces and |
14336 | // classes associated with the types of the function arguments. |
14337 | // - When looking for a prior declaration of a class or a function |
14338 | // declared as a friend, scopes outside the innermost enclosing |
14339 | // namespace scope are not considered. |
14340 | |
14341 | CXXScopeSpec &SS = D.getCXXScopeSpec(); |
14342 | DeclarationNameInfo NameInfo = GetNameForDeclarator(D); |
14343 | assert(NameInfo.getName())((NameInfo.getName()) ? static_cast<void> (0) : __assert_fail ("NameInfo.getName()", "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 14343, __PRETTY_FUNCTION__)); |
14344 | |
14345 | // Check for unexpanded parameter packs. |
14346 | if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || |
14347 | DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || |
14348 | DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) |
14349 | return nullptr; |
14350 | |
14351 | // The context we found the declaration in, or in which we should |
14352 | // create the declaration. |
14353 | DeclContext *DC; |
14354 | Scope *DCScope = S; |
14355 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, |
14356 | ForExternalRedeclaration); |
14357 | |
14358 | // There are five cases here. |
14359 | // - There's no scope specifier and we're in a local class. Only look |
14360 | // for functions declared in the immediately-enclosing block scope. |
14361 | // We recover from invalid scope qualifiers as if they just weren't there. |
14362 | FunctionDecl *FunctionContainingLocalClass = nullptr; |
14363 | if ((SS.isInvalid() || !SS.isSet()) && |
14364 | (FunctionContainingLocalClass = |
14365 | cast<CXXRecordDecl>(CurContext)->isLocalClass())) { |
14366 | // C++11 [class.friend]p11: |
14367 | // If a friend declaration appears in a local class and the name |
14368 | // specified is an unqualified name, a prior declaration is |
14369 | // looked up without considering scopes that are outside the |
14370 | // innermost enclosing non-class scope. For a friend function |
14371 | // declaration, if there is no prior declaration, the program is |
14372 | // ill-formed. |
14373 | |
14374 | // Find the innermost enclosing non-class scope. This is the block |
14375 | // scope containing the local class definition (or for a nested class, |
14376 | // the outer local class). |
14377 | DCScope = S->getFnParent(); |
14378 | |
14379 | // Look up the function name in the scope. |
14380 | Previous.clear(LookupLocalFriendName); |
14381 | LookupName(Previous, S, /*AllowBuiltinCreation*/false); |
14382 | |
14383 | if (!Previous.empty()) { |
14384 | // All possible previous declarations must have the same context: |
14385 | // either they were declared at block scope or they are members of |
14386 | // one of the enclosing local classes. |
14387 | DC = Previous.getRepresentativeDecl()->getDeclContext(); |
14388 | } else { |
14389 | // This is ill-formed, but provide the context that we would have |
14390 | // declared the function in, if we were permitted to, for error recovery. |
14391 | DC = FunctionContainingLocalClass; |
14392 | } |
14393 | adjustContextForLocalExternDecl(DC); |
14394 | |
14395 | // C++ [class.friend]p6: |
14396 | // A function can be defined in a friend declaration of a class if and |
14397 | // only if the class is a non-local class (9.8), the function name is |
14398 | // unqualified, and the function has namespace scope. |
14399 | if (D.isFunctionDefinition()) { |
14400 | Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); |
14401 | } |
14402 | |
14403 | // - There's no scope specifier, in which case we just go to the |
14404 | // appropriate scope and look for a function or function template |
14405 | // there as appropriate. |
14406 | } else if (SS.isInvalid() || !SS.isSet()) { |
14407 | // C++11 [namespace.memdef]p3: |
14408 | // If the name in a friend declaration is neither qualified nor |
14409 | // a template-id and the declaration is a function or an |
14410 | // elaborated-type-specifier, the lookup to determine whether |
14411 | // the entity has been previously declared shall not consider |
14412 | // any scopes outside the innermost enclosing namespace. |
14413 | bool isTemplateId = |
14414 | D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId; |
14415 | |
14416 | // Find the appropriate context according to the above. |
14417 | DC = CurContext; |
14418 | |
14419 | // Skip class contexts. If someone can cite chapter and verse |
14420 | // for this behavior, that would be nice --- it's what GCC and |
14421 | // EDG do, and it seems like a reasonable intent, but the spec |
14422 | // really only says that checks for unqualified existing |
14423 | // declarations should stop at the nearest enclosing namespace, |
14424 | // not that they should only consider the nearest enclosing |
14425 | // namespace. |
14426 | while (DC->isRecord()) |
14427 | DC = DC->getParent(); |
14428 | |
14429 | DeclContext *LookupDC = DC; |
14430 | while (LookupDC->isTransparentContext()) |
14431 | LookupDC = LookupDC->getParent(); |
14432 | |
14433 | while (true) { |
14434 | LookupQualifiedName(Previous, LookupDC); |
14435 | |
14436 | if (!Previous.empty()) { |
14437 | DC = LookupDC; |
14438 | break; |
14439 | } |
14440 | |
14441 | if (isTemplateId) { |
14442 | if (isa<TranslationUnitDecl>(LookupDC)) break; |
14443 | } else { |
14444 | if (LookupDC->isFileContext()) break; |
14445 | } |
14446 | LookupDC = LookupDC->getParent(); |
14447 | } |
14448 | |
14449 | DCScope = getScopeForDeclContext(S, DC); |
14450 | |
14451 | // - There's a non-dependent scope specifier, in which case we |
14452 | // compute it and do a previous lookup there for a function |
14453 | // or function template. |
14454 | } else if (!SS.getScopeRep()->isDependent()) { |
14455 | DC = computeDeclContext(SS); |
14456 | if (!DC) return nullptr; |
14457 | |
14458 | if (RequireCompleteDeclContext(SS, DC)) return nullptr; |
14459 | |
14460 | LookupQualifiedName(Previous, DC); |
14461 | |
14462 | // C++ [class.friend]p1: A friend of a class is a function or |
14463 | // class that is not a member of the class . . . |
14464 | if (DC->Equals(CurContext)) |
14465 | Diag(DS.getFriendSpecLoc(), |
14466 | getLangOpts().CPlusPlus11 ? |
14467 | diag::warn_cxx98_compat_friend_is_member : |
14468 | diag::err_friend_is_member); |
14469 | |
14470 | if (D.isFunctionDefinition()) { |
14471 | // C++ [class.friend]p6: |
14472 | // A function can be defined in a friend declaration of a class if and |
14473 | // only if the class is a non-local class (9.8), the function name is |
14474 | // unqualified, and the function has namespace scope. |
14475 | // |
14476 | // FIXME: We should only do this if the scope specifier names the |
14477 | // innermost enclosing namespace; otherwise the fixit changes the |
14478 | // meaning of the code. |
14479 | SemaDiagnosticBuilder DB |
14480 | = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); |
14481 | |
14482 | DB << SS.getScopeRep(); |
14483 | if (DC->isFileContext()) |
14484 | DB << FixItHint::CreateRemoval(SS.getRange()); |
14485 | SS.clear(); |
14486 | } |
14487 | |
14488 | // - There's a scope specifier that does not match any template |
14489 | // parameter lists, in which case we use some arbitrary context, |
14490 | // create a method or method template, and wait for instantiation. |
14491 | // - There's a scope specifier that does match some template |
14492 | // parameter lists, which we don't handle right now. |
14493 | } else { |
14494 | if (D.isFunctionDefinition()) { |
14495 | // C++ [class.friend]p6: |
14496 | // A function can be defined in a friend declaration of a class if and |
14497 | // only if the class is a non-local class (9.8), the function name is |
14498 | // unqualified, and the function has namespace scope. |
14499 | Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) |
14500 | << SS.getScopeRep(); |
14501 | } |
14502 | |
14503 | DC = CurContext; |
14504 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 14504, __PRETTY_FUNCTION__)); |
14505 | } |
14506 | |
14507 | if (!DC->isRecord()) { |
14508 | int DiagArg = -1; |
14509 | switch (D.getName().getKind()) { |
14510 | case UnqualifiedIdKind::IK_ConstructorTemplateId: |
14511 | case UnqualifiedIdKind::IK_ConstructorName: |
14512 | DiagArg = 0; |
14513 | break; |
14514 | case UnqualifiedIdKind::IK_DestructorName: |
14515 | DiagArg = 1; |
14516 | break; |
14517 | case UnqualifiedIdKind::IK_ConversionFunctionId: |
14518 | DiagArg = 2; |
14519 | break; |
14520 | case UnqualifiedIdKind::IK_DeductionGuideName: |
14521 | DiagArg = 3; |
14522 | break; |
14523 | case UnqualifiedIdKind::IK_Identifier: |
14524 | case UnqualifiedIdKind::IK_ImplicitSelfParam: |
14525 | case UnqualifiedIdKind::IK_LiteralOperatorId: |
14526 | case UnqualifiedIdKind::IK_OperatorFunctionId: |
14527 | case UnqualifiedIdKind::IK_TemplateId: |
14528 | break; |
14529 | } |
14530 | // This implies that it has to be an operator or function. |
14531 | if (DiagArg >= 0) { |
14532 | Diag(Loc, diag::err_introducing_special_friend) << DiagArg; |
14533 | return nullptr; |
14534 | } |
14535 | } |
14536 | |
14537 | // FIXME: This is an egregious hack to cope with cases where the scope stack |
14538 | // does not contain the declaration context, i.e., in an out-of-line |
14539 | // definition of a class. |
14540 | Scope FakeDCScope(S, Scope::DeclScope, Diags); |
14541 | if (!DCScope) { |
14542 | FakeDCScope.setEntity(DC); |
14543 | DCScope = &FakeDCScope; |
14544 | } |
14545 | |
14546 | bool AddToScope = true; |
14547 | NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, |
14548 | TemplateParams, AddToScope); |
14549 | if (!ND) return nullptr; |
14550 | |
14551 | assert(ND->getLexicalDeclContext() == CurContext)((ND->getLexicalDeclContext() == CurContext) ? static_cast <void> (0) : __assert_fail ("ND->getLexicalDeclContext() == CurContext" , "/build/llvm-toolchain-snapshot-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 14551, __PRETTY_FUNCTION__)); |
14552 | |
14553 | // If we performed typo correction, we might have added a scope specifier |
14554 | // and changed the decl context. |
14555 | DC = ND->getDeclContext(); |
14556 | |
14557 | // Add the function declaration to the appropriate lookup tables, |
14558 | // adjusting the redeclarations list as necessary. We don't |
14559 | // want to do this yet if the friending class is dependent. |
14560 | // |
14561 | // Also update the scope-based lookup if the target context's |
14562 | // lookup context is in lexical scope. |
14563 | if (!CurContext->isDependentContext()) { |
14564 | DC = DC->getRedeclContext(); |
14565 | DC->makeDeclVisibleInContext(ND); |
14566 | if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) |
14567 | PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); |
14568 | } |
14569 | |
14570 | FriendDecl *FrD = FriendDecl::Create(Context, CurContext, |
14571 | D.getIdentifierLoc(), ND, |
14572 | DS.getFriendSpecLoc()); |
14573 | FrD->setAccess(AS_public); |
14574 | CurContext->addDecl(FrD); |
14575 | |
14576 | if (ND->isInvalidDecl()) { |
14577 | FrD->setInvalidDecl(); |
14578 | } else { |
14579 | if (DC->isRecord()) CheckFriendAccess(ND); |
14580 | |
14581 | FunctionDecl *FD; |
14582 | if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) |
14583 | FD = FTD->getTemplatedDecl(); |
14584 | else |
14585 | FD = cast<FunctionDecl>(ND); |
14586 | |
14587 | // C++11 [dcl.fct.default]p4: If a friend declaration specifies a |
14588 | // default argument expression, that declaration shall be a definition |
14589 | // and shall be the only declaration of the function or function |
14590 | // template in the translation unit. |
14591 | if (functionDeclHasDefaultArgument(FD)) { |
14592 | // We can't look at FD->getPreviousDecl() because it may not have been set |
14593 | // if we're in a dependent context. If the function is known to be a |
14594 | // redeclaration, we will have narrowed Previous down to the right decl. |
14595 | if (D.isRedeclaration()) { |
14596 | Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_redeclared); |
14597 | Diag(Previous.getRepresentativeDecl()->getLocation(), |
14598 | diag::note_previous_declaration); |
14599 | } else if (!D.isFunctionDefinition()) |
14600 | Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_must_be_def); |
14601 | } |
14602 | |
14603 | // Mark templated-scope function declarations as unsupported. |
14604 | if (FD->getNumTemplateParameterLists() && SS.isValid()) { |
14605 | Diag(FD->getLocation(), diag::warn_template_qualified_friend_unsupported) |
14606 | << SS.getScopeRep() << SS.getRange() |
14607 | << cast<CXXRecordDecl>(CurContext); |
14608 | FrD->setUnsupportedFriend(true); |
14609 | } |
14610 | } |
14611 | |
14612 | return ND; |
14613 | } |
14614 | |
14615 | void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { |
14616 | AdjustDeclIfTemplate(Dcl); |
14617 | |
14618 | FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl); |
14619 | if (!Fn) { |
14620 | Diag(DelLoc, diag::err_deleted_non_function); |
14621 | return; |
14622 | } |
14623 | |
14624 | // Deleted function does not have a body. |
14625 | Fn->setWillHaveBody(false); |
14626 | |
14627 | if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { |
14628 | // Don't consider the implicit declaration we generate for explicit |
14629 | // specializations. FIXME: Do not generate these implicit declarations. |
14630 | if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization || |
14631 | Prev->getPreviousDecl()) && |
14632 | !Prev->isDefined()) { |
14633 | Diag(DelLoc, diag::err_deleted_decl_not_first); |
14634 | Diag(Prev->getLocation().isInvalid() ? DelLoc : Prev->getLocation(), |
14635 | Prev->isImplicit() ? diag::note_previous_implicit_declaration |
14636 | : diag::note_previous_declaration); |
14637 | } |
14638 | // If the declaration wasn't the first, we delete the function anyway for |
14639 | // recovery. |
14640 | Fn = Fn->getCanonicalDecl(); |
14641 | } |
14642 | |
14643 | // dllimport/dllexport cannot be deleted. |
14644 | if (const InheritableAttr *DLLAttr = getDLLAttr(Fn)) { |
14645 | Diag(Fn->getLocation(), diag::err_attribute_dll_deleted) << DLLAttr; |
14646 | Fn->setInvalidDecl(); |
14647 | } |
14648 | |
14649 | if (Fn->isDeleted()) |
14650 | return; |
14651 | |
14652 | // See if we're deleting a function which is already known to override a |
14653 | // non-deleted virtual function. |
14654 | if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn)) { |
14655 | bool IssuedDiagnostic = false; |
14656 | for (const CXXMethodDecl *O : MD->overridden_methods()) { |
14657 | if (!(*MD->begin_overridden_methods())->isDeleted()) { |
14658 | if (!IssuedDiagnostic) { |
14659 | Diag(DelLoc, diag::err_deleted_override) << MD->getDeclName(); |
14660 | IssuedDiagnostic = true; |
14661 | } |
14662 | Diag(O->getLocation(), diag::note_overridden_virtual_function); |
14663 | } |
14664 | } |
14665 | // If this function was implicitly deleted because it was defaulted, |
14666 | // explain why it was deleted. |
14667 | if (IssuedDiagnostic && MD->isDefaulted()) |
14668 | ShouldDeleteSpecialMember(MD, getSpecialMember(MD), nullptr, |
14669 | /*Diagnose*/true); |
14670 | } |
14671 | |
14672 | // C++11 [basic.start.main]p3: |
14673 | // A program that defines main as deleted [...] is ill-formed. |
14674 | if (Fn->isMain()) |
14675 | Diag(DelLoc, diag::err_deleted_main); |
14676 | |
14677 | // C++11 [dcl.fct.def.delete]p4: |
14678 | // A deleted function is implicitly inline. |
14679 | Fn->setImplicitlyInline(); |
14680 | Fn->setDeletedAsWritten(); |
14681 | } |
14682 | |
14683 | void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { |
14684 | CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Dcl); |
14685 | |
14686 | if (MD) { |
14687 | if (MD->getParent()->isDependentType()) { |
14688 | MD->setDefaulted(); |
14689 | MD->setExplicitlyDefaulted(); |
14690 | return; |
14691 | } |
14692 | |
14693 | CXXSpecialMember Member = getSpecialMember(MD); |
14694 | if (Member == CXXInvalid) { |
14695 | if (!MD->isInvalidDecl()) |
14696 | Diag(DefaultLoc, diag::err_default_special_members); |
14697 | return; |
14698 | } |
14699 | |
14700 | MD->setDefaulted(); |
14701 | MD->setExplicitlyDefaulted(); |
14702 | |
14703 | // Unset that we will have a body for this function. We might not, |
14704 | // if it turns out to be trivial, and we don't need this marking now |
14705 | // that we've marked it as defaulted. |
14706 | MD->setWillHaveBody(false); |
14707 | |
14708 | // If this definition appears within the record, do the checking when |
14709 | // the record is complete. |
14710 | const FunctionDecl *Primary = MD; |
14711 | if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) |
14712 | // Ask the template instantiation pattern that actually had the |
14713 | // '= default' on it. |
14714 | Primary = Pattern; |
14715 | |
14716 | // If the method was defaulted on its first declaration, we will have |
14717 | // already performed the checking in CheckCompletedCXXClass. Such a |
14718 | // declaration doesn't trigger an implicit definition. |
14719 | if (Primary->getCanonicalDecl()->isDefaulted()) |
14720 | return; |
14721 | |
14722 | CheckExplicitlyDefaultedSpecialMember(MD); |
14723 | |
14724 | if (!MD->isInvalidDecl()) |
14725 | DefineImplicitSpecialMember(*this, MD, DefaultLoc); |
14726 | } else { |
14727 | Diag(DefaultLoc, diag::err_default_special_members); |
14728 | } |
14729 | } |
14730 | |
14731 | static void SearchForReturnInStmt(Sema &Self, Stmt *S) { |
14732 | for (Stmt *SubStmt : S->children()) { |
14733 | if (!SubStmt) |
14734 | continue; |
14735 | if (isa<ReturnStmt>(SubStmt)) |
14736 | Self.Diag(SubStmt->getBeginLoc(), |
14737 | diag::err_return_in_constructor_handler); |
14738 | if (!isa<Expr>(SubStmt)) |
14739 | SearchForReturnInStmt(Self, SubStmt); |
14740 | } |
14741 | } |
14742 | |
14743 | void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { |
14744 | for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { |
14745 | CXXCatchStmt *Handler = TryBlock->getHandler(I); |
14746 | SearchForReturnInStmt(*this, Handler); |
14747 | } |
14748 | } |
14749 | |
14750 | bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, |
14751 | const CXXMethodDecl *Old) { |
14752 | const auto *NewFT = New->getType()->getAs<FunctionProtoType>(); |
14753 | const auto *OldFT = Old->getType()->getAs<FunctionProtoType>(); |
14754 | |
14755 | if (OldFT->hasExtParameterInfos()) { |
14756 | for (unsigned I = 0, E = OldFT->getNumParams(); I != E; ++I) |
14757 | // A parameter of the overriding method should be annotated with noescape |
14758 | // if the corresponding parameter of the overridden method is annotated. |
14759 | if (OldFT->getExtParameterInfo(I).isNoEscape() && |
14760 | !NewFT->getExtParameterInfo(I).isNoEscape()) { |
14761 | Diag(New->getParamDecl(I)->getLocation(), |
14762 | diag::warn_overriding_method_missing_noescape); |
14763 | Diag(Old->getParamDecl(I)->getLocation(), |
14764 | diag::note_overridden_marked_noescape); |
14765 | } |
14766 | } |
14767 | |
14768 | // Virtual overrides must have the same code_seg. |
14769 | const auto *OldCSA = Old->getAttr<CodeSegAttr>(); |
14770 | const auto *NewCSA = New->getAttr<CodeSegAttr>(); |
14771 | if ((NewCSA || OldCSA) && |
14772 | (!OldCSA || !NewCSA || NewCSA->getName() != OldCSA->getName())) { |
14773 | Diag(New->getLocation(), diag::err_mismatched_code_seg_override); |
14774 | Diag(Old->getLocation(), diag::note_previous_declaration); |
14775 | return true; |
14776 | } |
14777 | |
14778 | CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv(); |
14779 | |
14780 | // If the calling conventions match, everything is fine |
14781 | if (NewCC == OldCC) |
14782 | return false; |
14783 | |
14784 | // If the calling conventions mismatch because the new function is static, |
14785 | // suppress the calling convention mismatch error; the error about static |
14786 | // function override (err_static_overrides_virtual from |
14787 | // Sema::CheckFunctionDeclaration) is more clear. |
14788 | if (New->getStorageClass() == SC_Static) |
14789 | return false; |
14790 | |
14791 | Diag(New->getLocation(), |
14792 | diag::err_conflicting_overriding_cc_attributes) |
14793 | << New->getDeclName() << New->getType() << Old->getType(); |
14794 | Diag(Old->getLocation(), diag::note_overridden_virtual_function); |
14795 | return true; |
14796 | } |
14797 | |
14798 | bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, |
14799 | const CXXMethodDecl *Old) { |
14800 | QualType NewTy = New->getType()->getAs<FunctionType>()->getReturnType(); |
14801 | QualType OldTy = Old->getType()->getAs<FunctionType>()->getReturnType(); |
14802 | |
14803 | if (Context.hasSameType(NewTy, OldTy) || |
14804 | NewTy->isDependentType() || OldTy->isDependentType()) |
14805 | return false; |
14806 | |
14807 | // Check if the return types are covariant |
14808 | QualType NewClassTy, OldClassTy; |
14809 | |
14810 | /// Both types must be pointers or references to classes. |
14811 | if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { |
14812 | if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { |
14813 | NewClassTy = NewPT->getPointeeType(); |
14814 | OldClassTy = OldPT->getPointeeType(); |
14815 | } |
14816 | } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { |
14817 | if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { |
14818 | if (NewRT->getTypeClass() == OldRT->getTypeClass()) { |
14819 | NewClassTy = NewRT->getPointeeType(); |
14820 | OldClassTy = OldRT->getPointeeType(); |
14821 | } |
14822 | } |
14823 | } |
14824 | |
14825 | // The return types aren't either both pointers or references to a class type. |
14826 | if (NewClassTy.isNull()) { |
14827 | Diag(New->getLocation(), |
14828 | diag::err_different_return_type_for_overriding_virtual_function) |
14829 | << New->getDeclName() << NewTy << OldTy |
14830 | << New->getReturnTypeSourceRange(); |
14831 | Diag(Old->getLocation(), diag::note_overridden_virtual_function) |
14832 | << Old->getReturnTypeSourceRange(); |
14833 | |
14834 | return true; |
14835 | } |
14836 | |
14837 | if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { |
14838 | // C++14 [class.virtual]p8: |
14839 | // If the class type in the covariant return type of D::f differs from |
14840 | // that of B::f, the class type in the return type of D::f shall be |
14841 | // complete at the point of declaration of D::f or shall be the class |
14842 | // type D. |
14843 | if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { |
14844 | if (!RT->isBeingDefined() && |
14845 | RequireCompleteType(New->getLocation(), NewClassTy, |
14846 | diag::err_covariant_return_incomplete, |
14847 | New->getDeclName())) |
14848 | return true; |
14849 | } |
14850 | |
14851 | // Check if the new class derives from the old class. |
14852 | if (!IsDerivedFrom(New->getLocation(), NewClassTy, OldClassTy)) { |
14853 | Diag(New->getLocation(), diag::err_covariant_return_not_derived) |
14854 | << New->getDeclName() << NewTy << OldTy |
14855 | << New->getReturnTypeSourceRange(); |
14856 | Diag(Old->getLocation(), diag::note_overridden_virtual_function) |
14857 | << Old->getReturnTypeSourceRange(); |
14858 | return true; |
14859 | } |
14860 | |
14861 | // Check if we the conversion from derived to base is valid. |
14862 | if (CheckDerivedToBaseConversion( |
14863 | NewClassTy, OldClassTy, |
14864 | diag::err_covariant_return_inaccessible_base, |
14865 | diag::err_covariant_return_ambiguous_derived_to_base_conv, |
14866 | New->getLocation(), New->getReturnTypeSourceRange(), |
14867 | New->getDeclName(), nullptr)) { |
14868 | // FIXME: this note won't trigger for delayed access control |
14869 | // diagnostics, and it's impossible to get an undelayed error |
14870 | // here from access control during the original parse because |
14871 | // the ParsingDeclSpec/ParsingDeclarator are still in scope. |
14872 | Diag(Old->getLocation(), diag::note_overridden_virtual_function) |
14873 | << Old->getReturnTypeSourceRange(); |
14874 | return true; |
14875 | } |
14876 | } |
14877 | |
14878 | // The qualifiers of the return types must be the same. |
14879 | if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { |
14880 | Diag(New->getLocation(), |
14881 | diag::err_covariant_return_type_different_qualifications) |
14882 | << New->getDeclName() << NewTy << OldTy |
14883 | << New->getReturnTypeSourceRange(); |
14884 | Diag(Old->getLocation(), diag::note_overridden_virtual_function) |
14885 | << Old->getReturnTypeSourceRange(); |
14886 | return true; |
14887 | } |
14888 | |
14889 | |
14890 | // The new class type must have the same or less qualifiers as the old type. |
14891 | if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { |
14892 | Diag(New->getLocation(), |
14893 | diag::err_covariant_return_type_class_type_more_qualified) |
14894 | << New->getDeclName() << NewTy << OldTy |
14895 | << New->getReturnTypeSourceRange(); |
14896 | Diag(Old->getLocation(), diag::note_overridden_virtual_function) |
14897 | << Old->getReturnTypeSourceRange(); |
14898 | return true; |
14899 | } |
14900 | |
14901 | return false; |
14902 | } |
14903 | |
14904 | /// Mark the given method pure. |
14905 | /// |
14906 | /// \param Method the method to be marked pure. |
14907 | /// |
14908 | /// \param InitRange the source range that covers the "0" initializer. |
14909 | bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { |
14910 | SourceLocation EndLoc = InitRange.getEnd(); |
14911 | if (EndLoc.isValid()) |
14912 | Method->setRangeEnd(EndLoc); |
14913 | |
14914 | if (Method->isVirtual() || Method->getParent()->isDependentContext()) { |
14915 | Method->setPure(); |
14916 | return false; |
14917 | } |
14918 | |
14919 | if (!Method->isInvalidDecl()) |
14920 | Diag(Method->getLocation(), diag::err_non_virtual_pure) |
14921 | << Method->getDeclName() << InitRange; |
14922 | return true; |
14923 | } |
14924 | |
14925 | void Sema::ActOnPureSpecifier(Decl *D, SourceLocation ZeroLoc) { |
14926 | if (D->getFriendObjectKind()) |
14927 | Diag(D->getLocation(), diag::err_pure_friend); |
14928 | else if (auto *M = dyn_cast<CXXMethodDecl>(D)) |
14929 | CheckPureMethod(M, ZeroLoc); |
14930 | else |
14931 | Diag(D->getLocation(), diag::err_illegal_initializer); |
14932 | } |
14933 | |
14934 | /// Determine whether the given declaration is a global variable or |
14935 | /// static data member. |
14936 | static bool isNonlocalVariable(const Decl *D) { |
14937 | if (const VarDecl *Var = dyn_cast_or_null<VarDecl>(D)) |
14938 | return Var->hasGlobalStorage(); |
14939 | |
14940 | return false; |
14941 | } |
14942 | |
14943 | /// Invoked when we are about to parse an initializer for the declaration |
14944 | /// 'Dcl'. |
14945 | /// |
14946 | /// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a |
14947 | /// static data member of class X, names should be looked up in the scope of |
14948 | /// class X. If the declaration had a scope specifier, a scope will have |
14949 | /// been created and passed in for this purpose. Otherwise, S will be null. |
14950 | void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { |
14951 | // If there is no declaration, there was an error parsing it. |
14952 | if (!D || D->isInvalidDecl()) |
14953 | return; |
14954 | |
14955 | // We will always have a nested name specifier here, but this declaration |
14956 | // might not be out of line if the specifier names the current namespace: |
14957 | // extern int n; |
14958 | // int ::n = 0; |
14959 | if (S && D->isOutOfLine()) |
14960 | EnterDeclaratorContext(S, D->getDeclContext()); |
14961 | |
14962 | // If we are parsing the initializer for a static data member, push a |
14963 | // new expression evaluation context that is associated with this static |
14964 | // data member. |
14965 | if (isNonlocalVariable(D)) |
14966 | PushExpressionEvaluationContext( |
14967 | ExpressionEvaluationContext::PotentiallyEvaluated, D); |
14968 | } |
14969 | |
14970 | /// Invoked after we are finished parsing an initializer for the declaration D. |
14971 | void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { |
14972 | // If there is no declaration, there was an error parsing it. |
14973 | if (!D || D->isInvalidDecl()) |
14974 | return; |
14975 | |
14976 | if (isNonlocalVariable(D)) |
14977 | PopExpressionEvaluationContext(); |
14978 | |
14979 | if (S && D->isOutOfLine()) |
14980 | ExitDeclaratorContext(S); |
14981 | } |
14982 | |
14983 | /// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a |
14984 | /// C++ if/switch/while/for statement. |
14985 | /// e.g: "if (int x = f()) {...}" |
14986 | DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { |
14987 | // C++ 6.4p2: |
14988 | // The declarator shall not specify a function or an array. |
14989 | // The type-specifier-seq shall not contain typedef and shall not declare a |
14990 | // new class or enumeration. |
14991 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 14992, __PRETTY_FUNCTION__)) |
14992 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 14992, __PRETTY_FUNCTION__)); |
14993 | |
14994 | Decl *Dcl = ActOnDeclarator(S, D); |
14995 | if (!Dcl) |
14996 | return true; |
14997 | |
14998 | if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. |
14999 | Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) |
15000 | << D.getSourceRange(); |
15001 | return true; |
15002 | } |
15003 | |
15004 | return Dcl; |
15005 | } |
15006 | |
15007 | void Sema::LoadExternalVTableUses() { |
15008 | if (!ExternalSource) |
15009 | return; |
15010 | |
15011 | SmallVector<ExternalVTableUse, 4> VTables; |
15012 | ExternalSource->ReadUsedVTables(VTables); |
15013 | SmallVector<VTableUse, 4> NewUses; |
15014 | for (unsigned I = 0, N = VTables.size(); I != N; ++I) { |
15015 | llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos |
15016 | = VTablesUsed.find(VTables[I].Record); |
15017 | // Even if a definition wasn't required before, it may be required now. |
15018 | if (Pos != VTablesUsed.end()) { |
15019 | if (!Pos->second && VTables[I].DefinitionRequired) |
15020 | Pos->second = true; |
15021 | continue; |
15022 | } |
15023 | |
15024 | VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; |
15025 | NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); |
15026 | } |
15027 | |
15028 | VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); |
15029 | } |
15030 | |
15031 | void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, |
15032 | bool DefinitionRequired) { |
15033 | // Ignore any vtable uses in unevaluated operands or for classes that do |
15034 | // not have a vtable. |
15035 | if (!Class->isDynamicClass() || Class->isDependentContext() || |
15036 | CurContext->isDependentContext() || isUnevaluatedContext()) |
15037 | return; |
15038 | // Do not mark as used if compiling for the device outside of the target |
15039 | // region. |
15040 | if (LangOpts.OpenMP && LangOpts.OpenMPIsDevice && |
15041 | !isInOpenMPDeclareTargetContext() && |
15042 | !isInOpenMPTargetExecutionDirective()) { |
15043 | if (!DefinitionRequired) |
15044 | MarkVirtualMembersReferenced(Loc, Class); |
15045 | return; |
15046 | } |
15047 | |
15048 | // Try to insert this class into the map. |
15049 | LoadExternalVTableUses(); |
15050 | Class = Class->getCanonicalDecl(); |
15051 | std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> |
15052 | Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); |
15053 | if (!Pos.second) { |
15054 | // If we already had an entry, check to see if we are promoting this vtable |
15055 | // to require a definition. If so, we need to reappend to the VTableUses |
15056 | // list, since we may have already processed the first entry. |
15057 | if (DefinitionRequired && !Pos.first->second) { |
15058 | Pos.first->second = true; |
15059 | } else { |
15060 | // Otherwise, we can early exit. |
15061 | return; |
15062 | } |
15063 | } else { |
15064 | // The Microsoft ABI requires that we perform the destructor body |
15065 | // checks (i.e. operator delete() lookup) when the vtable is marked used, as |
15066 | // the deleting destructor is emitted with the vtable, not with the |
15067 | // destructor definition as in the Itanium ABI. |
15068 | if (Context.getTargetInfo().getCXXABI().isMicrosoft()) { |
15069 | CXXDestructorDecl *DD = Class->getDestructor(); |
15070 | if (DD && DD->isVirtual() && !DD->isDeleted()) { |
15071 | if (Class->hasUserDeclaredDestructor() && !DD->isDefined()) { |
15072 | // If this is an out-of-line declaration, marking it referenced will |
15073 | // not do anything. Manually call CheckDestructor to look up operator |
15074 | // delete(). |
15075 | ContextRAII SavedContext(*this, DD); |
15076 | CheckDestructor(DD); |
15077 | } else { |
15078 | MarkFunctionReferenced(Loc, Class->getDestructor()); |
15079 | } |
15080 | } |
15081 | } |
15082 | } |
15083 | |
15084 | // Local classes need to have their virtual members marked |
15085 | // immediately. For all other classes, we mark their virtual members |
15086 | // at the end of the translation unit. |
15087 | if (Class->isLocalClass()) |
15088 | MarkVirtualMembersReferenced(Loc, Class); |
15089 | else |
15090 | VTableUses.push_back(std::make_pair(Class, Loc)); |
15091 | } |
15092 | |
15093 | bool Sema::DefineUsedVTables() { |
15094 | LoadExternalVTableUses(); |
15095 | if (VTableUses.empty()) |
15096 | return false; |
15097 | |
15098 | // Note: The VTableUses vector could grow as a result of marking |
15099 | // the members of a class as "used", so we check the size each |
15100 | // time through the loop and prefer indices (which are stable) to |
15101 | // iterators (which are not). |
15102 | bool DefinedAnything = false; |
15103 | for (unsigned I = 0; I != VTableUses.size(); ++I) { |
15104 | CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); |
15105 | if (!Class) |
15106 | continue; |
15107 | TemplateSpecializationKind ClassTSK = |
15108 | Class->getTemplateSpecializationKind(); |
15109 | |
15110 | SourceLocation Loc = VTableUses[I].second; |
15111 | |
15112 | bool DefineVTable = true; |
15113 | |
15114 | // If this class has a key function, but that key function is |
15115 | // defined in another translation unit, we don't need to emit the |
15116 | // vtable even though we're using it. |
15117 | const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class); |
15118 | if (KeyFunction && !KeyFunction->hasBody()) { |
15119 | // The key function is in another translation unit. |
15120 | DefineVTable = false; |
15121 | TemplateSpecializationKind TSK = |
15122 | KeyFunction->getTemplateSpecializationKind(); |
15123 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 15125, __PRETTY_FUNCTION__)) |
15124 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 15125, __PRETTY_FUNCTION__)) |
15125 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 15125, __PRETTY_FUNCTION__)); |
15126 | (void)TSK; |
15127 | } else if (!KeyFunction) { |
15128 | // If we have a class with no key function that is the subject |
15129 | // of an explicit instantiation declaration, suppress the |
15130 | // vtable; it will live with the explicit instantiation |
15131 | // definition. |
15132 | bool IsExplicitInstantiationDeclaration = |
15133 | ClassTSK == TSK_ExplicitInstantiationDeclaration; |
15134 | for (auto R : Class->redecls()) { |
15135 | TemplateSpecializationKind TSK |
15136 | = cast<CXXRecordDecl>(R)->getTemplateSpecializationKind(); |
15137 | if (TSK == TSK_ExplicitInstantiationDeclaration) |
15138 | IsExplicitInstantiationDeclaration = true; |
15139 | else if (TSK == TSK_ExplicitInstantiationDefinition) { |
15140 | IsExplicitInstantiationDeclaration = false; |
15141 | break; |
15142 | } |
15143 | } |
15144 | |
15145 | if (IsExplicitInstantiationDeclaration) |
15146 | DefineVTable = false; |
15147 | } |
15148 | |
15149 | // The exception specifications for all virtual members may be needed even |
15150 | // if we are not providing an authoritative form of the vtable in this TU. |
15151 | // We may choose to emit it available_externally anyway. |
15152 | if (!DefineVTable) { |
15153 | MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); |
15154 | continue; |
15155 | } |
15156 | |
15157 | // Mark all of the virtual members of this class as referenced, so |
15158 | // that we can build a vtable. Then, tell the AST consumer that a |
15159 | // vtable for this class is required. |
15160 | DefinedAnything = true; |
15161 | MarkVirtualMembersReferenced(Loc, Class); |
15162 | CXXRecordDecl *Canonical = Class->getCanonicalDecl(); |
15163 | if (VTablesUsed[Canonical]) |
15164 | Consumer.HandleVTable(Class); |
15165 | |
15166 | // Warn if we're emitting a weak vtable. The vtable will be weak if there is |
15167 | // no key function or the key function is inlined. Don't warn in C++ ABIs |
15168 | // that lack key functions, since the user won't be able to make one. |
15169 | if (Context.getTargetInfo().getCXXABI().hasKeyFunctions() && |
15170 | Class->isExternallyVisible() && ClassTSK != TSK_ImplicitInstantiation) { |
15171 | const FunctionDecl *KeyFunctionDef = nullptr; |
15172 | if (!KeyFunction || (KeyFunction->hasBody(KeyFunctionDef) && |
15173 | KeyFunctionDef->isInlined())) { |
15174 | Diag(Class->getLocation(), |
15175 | ClassTSK == TSK_ExplicitInstantiationDefinition |
15176 | ? diag::warn_weak_template_vtable |
15177 | : diag::warn_weak_vtable) |
15178 | << Class; |
15179 | } |
15180 | } |
15181 | } |
15182 | VTableUses.clear(); |
15183 | |
15184 | return DefinedAnything; |
15185 | } |
15186 | |
15187 | void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, |
15188 | const CXXRecordDecl *RD) { |
15189 | for (const auto *I : RD->methods()) |
15190 | if (I->isVirtual() && !I->isPure()) |
15191 | ResolveExceptionSpec(Loc, I->getType()->castAs<FunctionProtoType>()); |
15192 | } |
15193 | |
15194 | void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, |
15195 | const CXXRecordDecl *RD) { |
15196 | // Mark all functions which will appear in RD's vtable as used. |
15197 | CXXFinalOverriderMap FinalOverriders; |
15198 | RD->getFinalOverriders(FinalOverriders); |
15199 | for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), |
15200 | E = FinalOverriders.end(); |
15201 | I != E; ++I) { |
15202 | for (OverridingMethods::const_iterator OI = I->second.begin(), |
15203 | OE = I->second.end(); |
15204 | OI != OE; ++OI) { |
15205 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 15205, __PRETTY_FUNCTION__)); |
15206 | CXXMethodDecl *Overrider = OI->second.front().Method; |
15207 | |
15208 | // C++ [basic.def.odr]p2: |
15209 | // [...] A virtual member function is used if it is not pure. [...] |
15210 | if (!Overrider->isPure()) |
15211 | MarkFunctionReferenced(Loc, Overrider); |
15212 | } |
15213 | } |
15214 | |
15215 | // Only classes that have virtual bases need a VTT. |
15216 | if (RD->getNumVBases() == 0) |
15217 | return; |
15218 | |
15219 | for (const auto &I : RD->bases()) { |
15220 | const CXXRecordDecl *Base = |
15221 | cast<CXXRecordDecl>(I.getType()->getAs<RecordType>()->getDecl()); |
15222 | if (Base->getNumVBases() == 0) |
15223 | continue; |
15224 | MarkVirtualMembersReferenced(Loc, Base); |
15225 | } |
15226 | } |
15227 | |
15228 | /// SetIvarInitializers - This routine builds initialization ASTs for the |
15229 | /// Objective-C implementation whose ivars need be initialized. |
15230 | void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { |
15231 | if (!getLangOpts().CPlusPlus) |
15232 | return; |
15233 | if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { |
15234 | SmallVector<ObjCIvarDecl*, 8> ivars; |
15235 | CollectIvarsToConstructOrDestruct(OID, ivars); |
15236 | if (ivars.empty()) |
15237 | return; |
15238 | SmallVector<CXXCtorInitializer*, 32> AllToInit; |
15239 | for (unsigned i = 0; i < ivars.size(); i++) { |
15240 | FieldDecl *Field = ivars[i]; |
15241 | if (Field->isInvalidDecl()) |
15242 | continue; |
15243 | |
15244 | CXXCtorInitializer *Member; |
15245 | InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); |
15246 | InitializationKind InitKind = |
15247 | InitializationKind::CreateDefault(ObjCImplementation->getLocation()); |
15248 | |
15249 | InitializationSequence InitSeq(*this, InitEntity, InitKind, None); |
15250 | ExprResult MemberInit = |
15251 | InitSeq.Perform(*this, InitEntity, InitKind, None); |
15252 | MemberInit = MaybeCreateExprWithCleanups(MemberInit); |
15253 | // Note, MemberInit could actually come back empty if no initialization |
15254 | // is required (e.g., because it would call a trivial default constructor) |
15255 | if (!MemberInit.get() || MemberInit.isInvalid()) |
15256 | continue; |
15257 | |
15258 | Member = |
15259 | new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), |
15260 | SourceLocation(), |
15261 | MemberInit.getAs<Expr>(), |
15262 | SourceLocation()); |
15263 | AllToInit.push_back(Member); |
15264 | |
15265 | // Be sure that the destructor is accessible and is marked as referenced. |
15266 | if (const RecordType *RecordTy = |
15267 | Context.getBaseElementType(Field->getType()) |
15268 | ->getAs<RecordType>()) { |
15269 | CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); |
15270 | if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { |
15271 | MarkFunctionReferenced(Field->getLocation(), Destructor); |
15272 | CheckDestructorAccess(Field->getLocation(), Destructor, |
15273 | PDiag(diag::err_access_dtor_ivar) |
15274 | << Context.getBaseElementType(Field->getType())); |
15275 | } |
15276 | } |
15277 | } |
15278 | ObjCImplementation->setIvarInitializers(Context, |
15279 | AllToInit.data(), AllToInit.size()); |
15280 | } |
15281 | } |
15282 | |
15283 | static |
15284 | void DelegatingCycleHelper(CXXConstructorDecl* Ctor, |
15285 | llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Valid, |
15286 | llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Invalid, |
15287 | llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Current, |
15288 | Sema &S) { |
15289 | if (Ctor->isInvalidDecl()) |
15290 | return; |
15291 | |
15292 | CXXConstructorDecl *Target = Ctor->getTargetConstructor(); |
15293 | |
15294 | // Target may not be determinable yet, for instance if this is a dependent |
15295 | // call in an uninstantiated template. |
15296 | if (Target) { |
15297 | const FunctionDecl *FNTarget = nullptr; |
15298 | (void)Target->hasBody(FNTarget); |
15299 | Target = const_cast<CXXConstructorDecl*>( |
15300 | cast_or_null<CXXConstructorDecl>(FNTarget)); |
15301 | } |
15302 | |
15303 | CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), |
15304 | // Avoid dereferencing a null pointer here. |
15305 | *TCanonical = Target? Target->getCanonicalDecl() : nullptr; |
15306 | |
15307 | if (!Current.insert(Canonical).second) |
15308 | return; |
15309 | |
15310 | // We know that beyond here, we aren't chaining into a cycle. |
15311 | if (!Target || !Target->isDelegatingConstructor() || |
15312 | Target->isInvalidDecl() || Valid.count(TCanonical)) { |
15313 | Valid.insert(Current.begin(), Current.end()); |
15314 | Current.clear(); |
15315 | // We've hit a cycle. |
15316 | } else if (TCanonical == Canonical || Invalid.count(TCanonical) || |
15317 | Current.count(TCanonical)) { |
15318 | // If we haven't diagnosed this cycle yet, do so now. |
15319 | if (!Invalid.count(TCanonical)) { |
15320 | S.Diag((*Ctor->init_begin())->getSourceLocation(), |
15321 | diag::warn_delegating_ctor_cycle) |
15322 | << Ctor; |
15323 | |
15324 | // Don't add a note for a function delegating directly to itself. |
15325 | if (TCanonical != Canonical) |
15326 | S.Diag(Target->getLocation(), diag::note_it_delegates_to); |
15327 | |
15328 | CXXConstructorDecl *C = Target; |
15329 | while (C->getCanonicalDecl() != Canonical) { |
15330 | const FunctionDecl *FNTarget = nullptr; |
15331 | (void)C->getTargetConstructor()->hasBody(FNTarget); |
15332 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 15332, __PRETTY_FUNCTION__)); |
15333 | |
15334 | C = const_cast<CXXConstructorDecl*>( |
15335 | cast<CXXConstructorDecl>(FNTarget)); |
15336 | S.Diag(C->getLocation(), diag::note_which_delegates_to); |
15337 | } |
15338 | } |
15339 | |
15340 | Invalid.insert(Current.begin(), Current.end()); |
15341 | Current.clear(); |
15342 | } else { |
15343 | DelegatingCycleHelper(Target, Valid, Invalid, Current, S); |
15344 | } |
15345 | } |
15346 | |
15347 | |
15348 | void Sema::CheckDelegatingCtorCycles() { |
15349 | llvm::SmallPtrSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; |
15350 | |
15351 | for (DelegatingCtorDeclsType::iterator |
15352 | I = DelegatingCtorDecls.begin(ExternalSource), |
15353 | E = DelegatingCtorDecls.end(); |
15354 | I != E; ++I) |
15355 | DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); |
15356 | |
15357 | for (auto CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) |
15358 | (*CI)->setInvalidDecl(); |
15359 | } |
15360 | |
15361 | namespace { |
15362 | /// AST visitor that finds references to the 'this' expression. |
15363 | class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { |
15364 | Sema &S; |
15365 | |
15366 | public: |
15367 | explicit FindCXXThisExpr(Sema &S) : S(S) { } |
15368 | |
15369 | bool VisitCXXThisExpr(CXXThisExpr *E) { |
15370 | S.Diag(E->getLocation(), diag::err_this_static_member_func) |
15371 | << E->isImplicit(); |
15372 | return false; |
15373 | } |
15374 | }; |
15375 | } |
15376 | |
15377 | bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { |
15378 | TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); |
15379 | if (!TSInfo) |
15380 | return false; |
15381 | |
15382 | TypeLoc TL = TSInfo->getTypeLoc(); |
15383 | FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); |
15384 | if (!ProtoTL) |
15385 | return false; |
15386 | |
15387 | // C++11 [expr.prim.general]p3: |
15388 | // [The expression this] shall not appear before the optional |
15389 | // cv-qualifier-seq and it shall not appear within the declaration of a |
15390 | // static member function (although its type and value category are defined |
15391 | // within a static member function as they are within a non-static member |
15392 | // function). [ Note: this is because declaration matching does not occur |
15393 | // until the complete declarator is known. - end note ] |
15394 | const FunctionProtoType *Proto = ProtoTL.getTypePtr(); |
15395 | FindCXXThisExpr Finder(*this); |
15396 | |
15397 | // If the return type came after the cv-qualifier-seq, check it now. |
15398 | if (Proto->hasTrailingReturn() && |
15399 | !Finder.TraverseTypeLoc(ProtoTL.getReturnLoc())) |
15400 | return true; |
15401 | |
15402 | // Check the exception specification. |
15403 | if (checkThisInStaticMemberFunctionExceptionSpec(Method)) |
15404 | return true; |
15405 | |
15406 | return checkThisInStaticMemberFunctionAttributes(Method); |
15407 | } |
15408 | |
15409 | bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { |
15410 | TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); |
15411 | if (!TSInfo) |
15412 | return false; |
15413 | |
15414 | TypeLoc TL = TSInfo->getTypeLoc(); |
15415 | FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); |
15416 | if (!ProtoTL) |
15417 | return false; |
15418 | |
15419 | const FunctionProtoType *Proto = ProtoTL.getTypePtr(); |
15420 | FindCXXThisExpr Finder(*this); |
15421 | |
15422 | switch (Proto->getExceptionSpecType()) { |
15423 | case EST_Unparsed: |
15424 | case EST_Uninstantiated: |
15425 | case EST_Unevaluated: |
15426 | case EST_BasicNoexcept: |
15427 | case EST_DynamicNone: |
15428 | case EST_MSAny: |
15429 | case EST_None: |
15430 | break; |
15431 | |
15432 | case EST_DependentNoexcept: |
15433 | case EST_NoexceptFalse: |
15434 | case EST_NoexceptTrue: |
15435 | if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) |
15436 | return true; |
15437 | LLVM_FALLTHROUGH[[clang::fallthrough]]; |
15438 | |
15439 | case EST_Dynamic: |
15440 | for (const auto &E : Proto->exceptions()) { |
15441 | if (!Finder.TraverseType(E)) |
15442 | return true; |
15443 | } |
15444 | break; |
15445 | } |
15446 | |
15447 | return false; |
15448 | } |
15449 | |
15450 | bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { |
15451 | FindCXXThisExpr Finder(*this); |
15452 | |
15453 | // Check attributes. |
15454 | for (const auto *A : Method->attrs()) { |
15455 | // FIXME: This should be emitted by tblgen. |
15456 | Expr *Arg = nullptr; |
15457 | ArrayRef<Expr *> Args; |
15458 | if (const auto *G = dyn_cast<GuardedByAttr>(A)) |
15459 | Arg = G->getArg(); |
15460 | else if (const auto *G = dyn_cast<PtGuardedByAttr>(A)) |
15461 | Arg = G->getArg(); |
15462 | else if (const auto *AA = dyn_cast<AcquiredAfterAttr>(A)) |
15463 | Args = llvm::makeArrayRef(AA->args_begin(), AA->args_size()); |
15464 | else if (const auto *AB = dyn_cast<AcquiredBeforeAttr>(A)) |
15465 | Args = llvm::makeArrayRef(AB->args_begin(), AB->args_size()); |
15466 | else if (const auto *ETLF = dyn_cast<ExclusiveTrylockFunctionAttr>(A)) { |
15467 | Arg = ETLF->getSuccessValue(); |
15468 | Args = llvm::makeArrayRef(ETLF->args_begin(), ETLF->args_size()); |
15469 | } else if (const auto *STLF = dyn_cast<SharedTrylockFunctionAttr>(A)) { |
15470 | Arg = STLF->getSuccessValue(); |
15471 | Args = llvm::makeArrayRef(STLF->args_begin(), STLF->args_size()); |
15472 | } else if (const auto *LR = dyn_cast<LockReturnedAttr>(A)) |
15473 | Arg = LR->getArg(); |
15474 | else if (const auto *LE = dyn_cast<LocksExcludedAttr>(A)) |
15475 | Args = llvm::makeArrayRef(LE->args_begin(), LE->args_size()); |
15476 | else if (const auto *RC = dyn_cast<RequiresCapabilityAttr>(A)) |
15477 | Args = llvm::makeArrayRef(RC->args_begin(), RC->args_size()); |
15478 | else if (const auto *AC = dyn_cast<AcquireCapabilityAttr>(A)) |
15479 | Args = llvm::makeArrayRef(AC->args_begin(), AC->args_size()); |
15480 | else if (const auto *AC = dyn_cast<TryAcquireCapabilityAttr>(A)) |
15481 | Args = llvm::makeArrayRef(AC->args_begin(), AC->args_size()); |
15482 | else if (const auto *RC = dyn_cast<ReleaseCapabilityAttr>(A)) |
15483 | Args = llvm::makeArrayRef(RC->args_begin(), RC->args_size()); |
15484 | |
15485 | if (Arg && !Finder.TraverseStmt(Arg)) |
15486 | return true; |
15487 | |
15488 | for (unsigned I = 0, N = Args.size(); I != N; ++I) { |
15489 | if (!Finder.TraverseStmt(Args[I])) |
15490 | return true; |
15491 | } |
15492 | } |
15493 | |
15494 | return false; |
15495 | } |
15496 | |
15497 | void Sema::checkExceptionSpecification( |
15498 | bool IsTopLevel, ExceptionSpecificationType EST, |
15499 | ArrayRef<ParsedType> DynamicExceptions, |
15500 | ArrayRef<SourceRange> DynamicExceptionRanges, Expr *NoexceptExpr, |
15501 | SmallVectorImpl<QualType> &Exceptions, |
15502 | FunctionProtoType::ExceptionSpecInfo &ESI) { |
15503 | Exceptions.clear(); |
15504 | ESI.Type = EST; |
15505 | if (EST == EST_Dynamic) { |
15506 | Exceptions.reserve(DynamicExceptions.size()); |
15507 | for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { |
15508 | // FIXME: Preserve type source info. |
15509 | QualType ET = GetTypeFromParser(DynamicExceptions[ei]); |
15510 | |
15511 | if (IsTopLevel) { |
15512 | SmallVector<UnexpandedParameterPack, 2> Unexpanded; |
15513 | collectUnexpandedParameterPacks(ET, Unexpanded); |
15514 | if (!Unexpanded.empty()) { |
15515 | DiagnoseUnexpandedParameterPacks( |
15516 | DynamicExceptionRanges[ei].getBegin(), UPPC_ExceptionType, |
15517 | Unexpanded); |
15518 | continue; |
15519 | } |
15520 | } |
15521 | |
15522 | // Check that the type is valid for an exception spec, and |
15523 | // drop it if not. |
15524 | if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) |
15525 | Exceptions.push_back(ET); |
15526 | } |
15527 | ESI.Exceptions = Exceptions; |
15528 | return; |
15529 | } |
15530 | |
15531 | if (isComputedNoexcept(EST)) { |
15532 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 15535, __PRETTY_FUNCTION__)) |
15533 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 15535, __PRETTY_FUNCTION__)) |
15534 | 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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 15535, __PRETTY_FUNCTION__)) |
15535 | "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-9~svn360410/tools/clang/lib/Sema/SemaDeclCXX.cpp" , 15535, __PRETTY_FUNCTION__)); |
15536 | if (IsTopLevel && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { |
15537 | ESI.Type = EST_BasicNoexcept; |
15538 | return; |
15539 | } |
15540 | |
15541 | ESI.NoexceptExpr = NoexceptExpr; |
15542 | return; |
15543 | } |
15544 | } |
15545 | |
15546 | void Sema::actOnDelayedExceptionSpecification(Decl *MethodD, |
15547 | ExceptionSpecificationType EST, |
15548 | SourceRange SpecificationRange, |
15549 | ArrayRef<ParsedType> DynamicExceptions, |
15550 | ArrayRef<SourceRange> DynamicExceptionRanges, |
15551 | Expr *NoexceptExpr) { |
15552 | if (!MethodD) |
15553 | return; |
15554 | |
15555 | // Dig out the method we're referring to. |
15556 | if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(MethodD)) |
15557 | MethodD = FunTmpl->getTemplatedDecl(); |
15558 | |
15559 | CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(MethodD); |
15560 | if (!Method) |
15561 | return; |
15562 | |
15563 | // Check the exception specification. |
15564 | llvm::SmallVector<QualType, 4> Exceptions; |
15565 | FunctionProtoType::ExceptionSpecInfo ESI; |
15566 | checkExceptionSpecification(/*IsTopLevel*/true, EST, DynamicExceptions, |
15567 | DynamicExceptionRanges, NoexceptExpr, Exceptions, |
15568 | ESI); |
15569 | |
15570 | // Update the exception specification on the function type. |
15571 | Context.adjustExceptionSpec(Method, ESI, /*AsWritten*/true); |
15572 | |
15573 | if (Method->isStatic()) |
15574 | checkThisInStaticMemberFunctionExceptionSpec(Method); |
15575 | |
15576 | if (Method->isVirtual()) { |
15577 | // Check overrides, which we previously had to delay. |
15578 | for (const CXXMethodDecl *O : Method->overridden_methods()) |
15579 | CheckOverridingFunctionExceptionSpec(Method, O); |
15580 | } |
15581 | } |
15582 | |
15583 | /// HandleMSProperty - Analyze a __delcspec(property) field of a C++ class. |
15584 | /// |
15585 | MSPropertyDecl *Sema::HandleMSProperty(Scope *S, RecordDecl *Record, |
15586 | SourceLocation DeclStart, Declarator &D, |
15587 | Expr *BitWidth, |
15588 | InClassInitStyle InitStyle, |
15589 | AccessSpecifier AS, |
15590 | const ParsedAttr &MSPropertyAttr) { |
15591 | IdentifierInfo *II = D.getIdentifier(); |
15592 | if (!II) { |
15593 | Diag(DeclStart, diag::err_anonymous_property); |
15594 | return nullptr; |
15595 | } |
15596 | SourceLocation Loc = D.getIdentifierLoc(); |
15597 | |
15598 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); |
15599 | QualType T = TInfo->getType(); |
15600 | if (getLangOpts().CPlusPlus) { |
15601 | CheckExtraCXXDefaultArguments(D); |
15602 | |
15603 | if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, |
15604 | UPPC_DataMemberType)) { |
15605 | D.setInvalidType(); |
15606 | T = Context.IntTy; |
15607 | TInfo = Context.getTrivialTypeSourceInfo(T, Loc); |
15608 | } |
15609 | } |
15610 | |
15611 | DiagnoseFunctionSpecifiers(D.getDeclSpec()); |
15612 | |
15613 | if (D.getDeclSpec().isInlineSpecified()) |
15614 | Diag(D.getDeclSpec().getInlineSpecLoc(), diag::err_inline_non_function) |
15615 | << getLangOpts().CPlusPlus17; |
15616 | if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec()) |
15617 | Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(), |
15618 | diag::err_invalid_thread) |
15619 | << DeclSpec::getSpecifierName(TSCS); |
15620 | |
15621 | // Check to see if this name was declared as a member previously |
15622 | NamedDecl *PrevDecl = nullptr; |
15623 | LookupResult Previous(*this, II, Loc, LookupMemberName, |
15624 | ForVisibleRedeclaration); |
15625 | LookupName(Previous, S); |
15626 | switch (Previous.getResultKind()) { |
15627 | case LookupResult::Found: |
15628 | case LookupResult::FoundUnresolvedValue: |
15629 | PrevDecl = Previous.getAsSingle<NamedDecl>(); |
15630 | break; |
15631 | |
15632 | case LookupResult::FoundOverloaded: |
15633 | PrevDecl = Previous.getRepresentativeDecl(); |
15634 | break; |
15635 | |
15636 | case LookupResult::NotFound: |
15637 | case LookupResult::NotFoundInCurrentInstantiation: |
15638 | case LookupResult::Ambiguous: |
15639 | break; |
15640 | } |
15641 | |
15642 | if (PrevDecl && PrevDecl->isTemplateParameter()) { |
15643 | // Maybe we will complain about the shadowed template parameter. |
15644 | DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); |
15645 | // Just pretend that we didn't see the previous declaration. |
15646 | PrevDecl = nullptr; |
15647 | } |
15648 | |
15649 | if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) |
15650 | PrevDecl = nullptr; |
15651 | |
15652 | SourceLocation TSSL = D.getBeginLoc(); |
15653 | MSPropertyDecl *NewPD = |
15654 | MSPropertyDecl::Create(Context, Record, Loc, II, T, TInfo, TSSL, |
15655 | MSPropertyAttr.getPropertyDataGetter(), |
15656 | MSPropertyAttr.getPropertyDataSetter()); |
15657 | ProcessDeclAttributes(TUScope, NewPD, D); |
15658 | NewPD->setAccess(AS); |
15659 | |
15660 | if (NewPD->isInvalidDecl()) |
15661 | Record->setInvalidDecl(); |
15662 | |
15663 | if (D.getDeclSpec().isModulePrivateSpecified()) |
15664 | NewPD->setModulePrivate(); |
15665 | |
15666 | if (NewPD->isInvalidDecl() && PrevDecl) { |
15667 | // Don't introduce NewFD into scope; there's already something |
15668 | // with the same name in the same scope. |
15669 | } else if (II) { |
15670 | PushOnScopeChains(NewPD, S); |
15671 | } else |
15672 | Record->addDecl(NewPD); |
15673 | |
15674 | return NewPD; |
15675 | } |