1 //===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements semantic analysis for declarations.
12 //===----------------------------------------------------------------------===//
14 #include "TypeLocBuilder.h"
15 #include "clang/AST/ASTConsumer.h"
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/ASTLambda.h"
18 #include "clang/AST/CXXInheritance.h"
19 #include "clang/AST/CharUnits.h"
20 #include "clang/AST/CommentDiagnostic.h"
21 #include "clang/AST/DeclCXX.h"
22 #include "clang/AST/DeclObjC.h"
23 #include "clang/AST/DeclTemplate.h"
24 #include "clang/AST/EvaluatedExprVisitor.h"
25 #include "clang/AST/ExprCXX.h"
26 #include "clang/AST/StmtCXX.h"
27 #include "clang/Basic/Builtins.h"
28 #include "clang/Basic/PartialDiagnostic.h"
29 #include "clang/Basic/SourceManager.h"
30 #include "clang/Basic/TargetInfo.h"
31 #include "clang/Lex/HeaderSearch.h" // TODO: Sema shouldn't depend on Lex
32 #include "clang/Lex/Lexer.h" // TODO: Extract static functions to fix layering.
33 #include "clang/Lex/ModuleLoader.h" // TODO: Sema shouldn't depend on Lex
34 #include "clang/Lex/Preprocessor.h" // Included for isCodeCompletionEnabled()
35 #include "clang/Sema/CXXFieldCollector.h"
36 #include "clang/Sema/DeclSpec.h"
37 #include "clang/Sema/DelayedDiagnostic.h"
38 #include "clang/Sema/Initialization.h"
39 #include "clang/Sema/Lookup.h"
40 #include "clang/Sema/ParsedTemplate.h"
41 #include "clang/Sema/Scope.h"
42 #include "clang/Sema/ScopeInfo.h"
43 #include "clang/Sema/SemaInternal.h"
44 #include "clang/Sema/Template.h"
45 #include "llvm/ADT/SmallString.h"
46 #include "llvm/ADT/Triple.h"
51 using namespace clang;
54 Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) {
56 Decl *Group[2] = { OwnedType, Ptr };
57 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2));
60 return DeclGroupPtrTy::make(DeclGroupRef(Ptr));
65 class TypeNameValidatorCCC : public CorrectionCandidateCallback {
67 TypeNameValidatorCCC(bool AllowInvalid, bool WantClass=false,
68 bool AllowTemplates=false)
69 : AllowInvalidDecl(AllowInvalid), WantClassName(WantClass),
70 AllowClassTemplates(AllowTemplates) {
71 WantExpressionKeywords = false;
72 WantCXXNamedCasts = false;
73 WantRemainingKeywords = false;
76 bool ValidateCandidate(const TypoCorrection &candidate) override {
77 if (NamedDecl *ND = candidate.getCorrectionDecl()) {
78 bool IsType = isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND);
79 bool AllowedTemplate = AllowClassTemplates && isa<ClassTemplateDecl>(ND);
80 return (IsType || AllowedTemplate) &&
81 (AllowInvalidDecl || !ND->isInvalidDecl());
83 return !WantClassName && candidate.isKeyword();
87 bool AllowInvalidDecl;
89 bool AllowClassTemplates;
92 } // end anonymous namespace
94 /// \brief Determine whether the token kind starts a simple-type-specifier.
95 bool Sema::isSimpleTypeSpecifier(tok::TokenKind Kind) const {
97 // FIXME: Take into account the current language when deciding whether a
98 // token kind is a valid type specifier
101 case tok::kw___int64:
102 case tok::kw___int128:
104 case tok::kw_unsigned:
111 case tok::kw___float128:
112 case tok::kw_wchar_t:
114 case tok::kw___underlying_type:
115 case tok::kw___auto_type:
118 case tok::annot_typename:
119 case tok::kw_char16_t:
120 case tok::kw_char32_t:
122 case tok::annot_decltype:
123 case tok::kw_decltype:
124 return getLangOpts().CPlusPlus;
134 enum class UnqualifiedTypeNameLookupResult {
139 } // end anonymous namespace
141 /// \brief Tries to perform unqualified lookup of the type decls in bases for
143 /// \return \a NotFound if no any decls is found, \a FoundNotType if found not a
144 /// type decl, \a FoundType if only type decls are found.
145 static UnqualifiedTypeNameLookupResult
146 lookupUnqualifiedTypeNameInBase(Sema &S, const IdentifierInfo &II,
147 SourceLocation NameLoc,
148 const CXXRecordDecl *RD) {
149 if (!RD->hasDefinition())
150 return UnqualifiedTypeNameLookupResult::NotFound;
151 // Look for type decls in base classes.
152 UnqualifiedTypeNameLookupResult FoundTypeDecl =
153 UnqualifiedTypeNameLookupResult::NotFound;
154 for (const auto &Base : RD->bases()) {
155 const CXXRecordDecl *BaseRD = nullptr;
156 if (auto *BaseTT = Base.getType()->getAs<TagType>())
157 BaseRD = BaseTT->getAsCXXRecordDecl();
158 else if (auto *TST = Base.getType()->getAs<TemplateSpecializationType>()) {
159 // Look for type decls in dependent base classes that have known primary
161 if (!TST || !TST->isDependentType())
163 auto *TD = TST->getTemplateName().getAsTemplateDecl();
166 if (auto *BasePrimaryTemplate =
167 dyn_cast_or_null<CXXRecordDecl>(TD->getTemplatedDecl())) {
168 if (BasePrimaryTemplate->getCanonicalDecl() != RD->getCanonicalDecl())
169 BaseRD = BasePrimaryTemplate;
170 else if (auto *CTD = dyn_cast<ClassTemplateDecl>(TD)) {
171 if (const ClassTemplatePartialSpecializationDecl *PS =
172 CTD->findPartialSpecialization(Base.getType()))
173 if (PS->getCanonicalDecl() != RD->getCanonicalDecl())
179 for (NamedDecl *ND : BaseRD->lookup(&II)) {
180 if (!isa<TypeDecl>(ND))
181 return UnqualifiedTypeNameLookupResult::FoundNonType;
182 FoundTypeDecl = UnqualifiedTypeNameLookupResult::FoundType;
184 if (FoundTypeDecl == UnqualifiedTypeNameLookupResult::NotFound) {
185 switch (lookupUnqualifiedTypeNameInBase(S, II, NameLoc, BaseRD)) {
186 case UnqualifiedTypeNameLookupResult::FoundNonType:
187 return UnqualifiedTypeNameLookupResult::FoundNonType;
188 case UnqualifiedTypeNameLookupResult::FoundType:
189 FoundTypeDecl = UnqualifiedTypeNameLookupResult::FoundType;
191 case UnqualifiedTypeNameLookupResult::NotFound:
198 return FoundTypeDecl;
201 static ParsedType recoverFromTypeInKnownDependentBase(Sema &S,
202 const IdentifierInfo &II,
203 SourceLocation NameLoc) {
204 // Lookup in the parent class template context, if any.
205 const CXXRecordDecl *RD = nullptr;
206 UnqualifiedTypeNameLookupResult FoundTypeDecl =
207 UnqualifiedTypeNameLookupResult::NotFound;
208 for (DeclContext *DC = S.CurContext;
209 DC && FoundTypeDecl == UnqualifiedTypeNameLookupResult::NotFound;
210 DC = DC->getParent()) {
211 // Look for type decls in dependent base classes that have known primary
213 RD = dyn_cast<CXXRecordDecl>(DC);
214 if (RD && RD->getDescribedClassTemplate())
215 FoundTypeDecl = lookupUnqualifiedTypeNameInBase(S, II, NameLoc, RD);
217 if (FoundTypeDecl != UnqualifiedTypeNameLookupResult::FoundType)
220 // We found some types in dependent base classes. Recover as if the user
221 // wrote 'typename MyClass::II' instead of 'II'. We'll fully resolve the
222 // lookup during template instantiation.
223 S.Diag(NameLoc, diag::ext_found_via_dependent_bases_lookup) << &II;
225 ASTContext &Context = S.Context;
226 auto *NNS = NestedNameSpecifier::Create(Context, nullptr, false,
227 cast<Type>(Context.getRecordType(RD)));
228 QualType T = Context.getDependentNameType(ETK_Typename, NNS, &II);
231 SS.MakeTrivial(Context, NNS, SourceRange(NameLoc));
233 TypeLocBuilder Builder;
234 DependentNameTypeLoc DepTL = Builder.push<DependentNameTypeLoc>(T);
235 DepTL.setNameLoc(NameLoc);
236 DepTL.setElaboratedKeywordLoc(SourceLocation());
237 DepTL.setQualifierLoc(SS.getWithLocInContext(Context));
238 return S.CreateParsedType(T, Builder.getTypeSourceInfo(Context, T));
241 /// \brief If the identifier refers to a type name within this scope,
242 /// return the declaration of that type.
244 /// This routine performs ordinary name lookup of the identifier II
245 /// within the given scope, with optional C++ scope specifier SS, to
246 /// determine whether the name refers to a type. If so, returns an
247 /// opaque pointer (actually a QualType) corresponding to that
248 /// type. Otherwise, returns NULL.
249 ParsedType Sema::getTypeName(const IdentifierInfo &II, SourceLocation NameLoc,
250 Scope *S, CXXScopeSpec *SS,
251 bool isClassName, bool HasTrailingDot,
252 ParsedType ObjectTypePtr,
253 bool IsCtorOrDtorName,
254 bool WantNontrivialTypeSourceInfo,
255 IdentifierInfo **CorrectedII) {
256 // Determine where we will perform name lookup.
257 DeclContext *LookupCtx = nullptr;
259 QualType ObjectType = ObjectTypePtr.get();
260 if (ObjectType->isRecordType())
261 LookupCtx = computeDeclContext(ObjectType);
262 } else if (SS && SS->isNotEmpty()) {
263 LookupCtx = computeDeclContext(*SS, false);
266 if (isDependentScopeSpecifier(*SS)) {
268 // A qualified-id that refers to a type and in which the
269 // nested-name-specifier depends on a template-parameter (14.6.2)
270 // shall be prefixed by the keyword typename to indicate that the
271 // qualified-id denotes a type, forming an
272 // elaborated-type-specifier (7.1.5.3).
274 // We therefore do not perform any name lookup if the result would
275 // refer to a member of an unknown specialization.
276 if (!isClassName && !IsCtorOrDtorName)
279 // We know from the grammar that this name refers to a type,
280 // so build a dependent node to describe the type.
281 if (WantNontrivialTypeSourceInfo)
282 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get();
284 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context);
285 QualType T = CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc,
287 return ParsedType::make(T);
293 if (!LookupCtx->isDependentContext() &&
294 RequireCompleteDeclContext(*SS, LookupCtx))
298 // FIXME: LookupNestedNameSpecifierName isn't the right kind of
299 // lookup for class-names.
300 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName :
302 LookupResult Result(*this, &II, NameLoc, Kind);
304 // Perform "qualified" name lookup into the declaration context we
305 // computed, which is either the type of the base of a member access
306 // expression or the declaration context associated with a prior
307 // nested-name-specifier.
308 LookupQualifiedName(Result, LookupCtx);
310 if (ObjectTypePtr && Result.empty()) {
311 // C++ [basic.lookup.classref]p3:
312 // If the unqualified-id is ~type-name, the type-name is looked up
313 // in the context of the entire postfix-expression. If the type T of
314 // the object expression is of a class type C, the type-name is also
315 // looked up in the scope of class C. At least one of the lookups shall
316 // find a name that refers to (possibly cv-qualified) T.
317 LookupName(Result, S);
320 // Perform unqualified name lookup.
321 LookupName(Result, S);
323 // For unqualified lookup in a class template in MSVC mode, look into
324 // dependent base classes where the primary class template is known.
325 if (Result.empty() && getLangOpts().MSVCCompat && (!SS || SS->isEmpty())) {
326 if (ParsedType TypeInBase =
327 recoverFromTypeInKnownDependentBase(*this, II, NameLoc))
332 NamedDecl *IIDecl = nullptr;
333 switch (Result.getResultKind()) {
334 case LookupResult::NotFound:
335 case LookupResult::NotFoundInCurrentInstantiation:
337 TypoCorrection Correction = CorrectTypo(
338 Result.getLookupNameInfo(), Kind, S, SS,
339 llvm::make_unique<TypeNameValidatorCCC>(true, isClassName),
341 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo();
343 bool MemberOfUnknownSpecialization;
344 UnqualifiedId TemplateName;
345 TemplateName.setIdentifier(NewII, NameLoc);
346 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier();
347 CXXScopeSpec NewSS, *NewSSPtr = SS;
349 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc));
352 if (Correction && (NNS || NewII != &II) &&
353 // Ignore a correction to a template type as the to-be-corrected
354 // identifier is not a template (typo correction for template names
355 // is handled elsewhere).
356 !(getLangOpts().CPlusPlus && NewSSPtr &&
357 isTemplateName(S, *NewSSPtr, false, TemplateName, nullptr, false,
358 Template, MemberOfUnknownSpecialization))) {
359 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr,
360 isClassName, HasTrailingDot, ObjectTypePtr,
362 WantNontrivialTypeSourceInfo);
364 diagnoseTypo(Correction,
365 PDiag(diag::err_unknown_type_or_class_name_suggest)
366 << Result.getLookupName() << isClassName);
368 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc));
369 *CorrectedII = NewII;
374 // If typo correction failed or was not performed, fall through
375 case LookupResult::FoundOverloaded:
376 case LookupResult::FoundUnresolvedValue:
377 Result.suppressDiagnostics();
380 case LookupResult::Ambiguous:
381 // Recover from type-hiding ambiguities by hiding the type. We'll
382 // do the lookup again when looking for an object, and we can
383 // diagnose the error then. If we don't do this, then the error
384 // about hiding the type will be immediately followed by an error
385 // that only makes sense if the identifier was treated like a type.
386 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) {
387 Result.suppressDiagnostics();
391 // Look to see if we have a type anywhere in the list of results.
392 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end();
393 Res != ResEnd; ++Res) {
394 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) {
396 (*Res)->getLocation().getRawEncoding() <
397 IIDecl->getLocation().getRawEncoding())
403 // None of the entities we found is a type, so there is no way
404 // to even assume that the result is a type. In this case, don't
405 // complain about the ambiguity. The parser will either try to
406 // perform this lookup again (e.g., as an object name), which
407 // will produce the ambiguity, or will complain that it expected
409 Result.suppressDiagnostics();
413 // We found a type within the ambiguous lookup; diagnose the
414 // ambiguity and then return that type. This might be the right
415 // answer, or it might not be, but it suppresses any attempt to
416 // perform the name lookup again.
419 case LookupResult::Found:
420 IIDecl = Result.getFoundDecl();
424 assert(IIDecl && "Didn't find decl");
427 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) {
428 DiagnoseUseOfDecl(IIDecl, NameLoc);
430 T = Context.getTypeDeclType(TD);
431 MarkAnyDeclReferenced(TD->getLocation(), TD, /*OdrUse=*/false);
433 // NOTE: avoid constructing an ElaboratedType(Loc) if this is a
434 // constructor or destructor name (in such a case, the scope specifier
435 // will be attached to the enclosing Expr or Decl node).
436 if (SS && SS->isNotEmpty() && !IsCtorOrDtorName) {
437 if (WantNontrivialTypeSourceInfo) {
438 // Construct a type with type-source information.
439 TypeLocBuilder Builder;
440 Builder.pushTypeSpec(T).setNameLoc(NameLoc);
442 T = getElaboratedType(ETK_None, *SS, T);
443 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T);
444 ElabTL.setElaboratedKeywordLoc(SourceLocation());
445 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context));
446 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T));
448 T = getElaboratedType(ETK_None, *SS, T);
451 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) {
452 (void)DiagnoseUseOfDecl(IDecl, NameLoc);
454 T = Context.getObjCInterfaceType(IDecl);
458 // If it's not plausibly a type, suppress diagnostics.
459 Result.suppressDiagnostics();
462 return ParsedType::make(T);
465 // Builds a fake NNS for the given decl context.
466 static NestedNameSpecifier *
467 synthesizeCurrentNestedNameSpecifier(ASTContext &Context, DeclContext *DC) {
468 for (;; DC = DC->getLookupParent()) {
469 DC = DC->getPrimaryContext();
470 auto *ND = dyn_cast<NamespaceDecl>(DC);
471 if (ND && !ND->isInline() && !ND->isAnonymousNamespace())
472 return NestedNameSpecifier::Create(Context, nullptr, ND);
473 else if (auto *RD = dyn_cast<CXXRecordDecl>(DC))
474 return NestedNameSpecifier::Create(Context, nullptr, RD->isTemplateDecl(),
475 RD->getTypeForDecl());
476 else if (isa<TranslationUnitDecl>(DC))
477 return NestedNameSpecifier::GlobalSpecifier(Context);
479 llvm_unreachable("something isn't in TU scope?");
482 /// Find the parent class with dependent bases of the innermost enclosing method
483 /// context. Do not look for enclosing CXXRecordDecls directly, or we will end
484 /// up allowing unqualified dependent type names at class-level, which MSVC
485 /// correctly rejects.
486 static const CXXRecordDecl *
487 findRecordWithDependentBasesOfEnclosingMethod(const DeclContext *DC) {
488 for (; DC && DC->isDependentContext(); DC = DC->getLookupParent()) {
489 DC = DC->getPrimaryContext();
490 if (const auto *MD = dyn_cast<CXXMethodDecl>(DC))
491 if (MD->getParent()->hasAnyDependentBases())
492 return MD->getParent();
497 ParsedType Sema::ActOnMSVCUnknownTypeName(const IdentifierInfo &II,
498 SourceLocation NameLoc,
499 bool IsTemplateTypeArg) {
500 assert(getLangOpts().MSVCCompat && "shouldn't be called in non-MSVC mode");
502 NestedNameSpecifier *NNS = nullptr;
503 if (IsTemplateTypeArg && getCurScope()->isTemplateParamScope()) {
504 // If we weren't able to parse a default template argument, delay lookup
505 // until instantiation time by making a non-dependent DependentTypeName. We
506 // pretend we saw a NestedNameSpecifier referring to the current scope, and
507 // lookup is retried.
508 // FIXME: This hurts our diagnostic quality, since we get errors like "no
509 // type named 'Foo' in 'current_namespace'" when the user didn't write any
511 NNS = synthesizeCurrentNestedNameSpecifier(Context, CurContext);
512 Diag(NameLoc, diag::ext_ms_delayed_template_argument) << &II;
513 } else if (const CXXRecordDecl *RD =
514 findRecordWithDependentBasesOfEnclosingMethod(CurContext)) {
515 // Build a DependentNameType that will perform lookup into RD at
516 // instantiation time.
517 NNS = NestedNameSpecifier::Create(Context, nullptr, RD->isTemplateDecl(),
518 RD->getTypeForDecl());
520 // Diagnose that this identifier was undeclared, and retry the lookup during
521 // template instantiation.
522 Diag(NameLoc, diag::ext_undeclared_unqual_id_with_dependent_base) << &II
525 // This is not a situation that we should recover from.
529 QualType T = Context.getDependentNameType(ETK_None, NNS, &II);
531 // Build type location information. We synthesized the qualifier, so we have
532 // to build a fake NestedNameSpecifierLoc.
533 NestedNameSpecifierLocBuilder NNSLocBuilder;
534 NNSLocBuilder.MakeTrivial(Context, NNS, SourceRange(NameLoc));
535 NestedNameSpecifierLoc QualifierLoc = NNSLocBuilder.getWithLocInContext(Context);
537 TypeLocBuilder Builder;
538 DependentNameTypeLoc DepTL = Builder.push<DependentNameTypeLoc>(T);
539 DepTL.setNameLoc(NameLoc);
540 DepTL.setElaboratedKeywordLoc(SourceLocation());
541 DepTL.setQualifierLoc(QualifierLoc);
542 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T));
545 /// isTagName() - This method is called *for error recovery purposes only*
546 /// to determine if the specified name is a valid tag name ("struct foo"). If
547 /// so, this returns the TST for the tag corresponding to it (TST_enum,
548 /// TST_union, TST_struct, TST_interface, TST_class). This is used to diagnose
549 /// cases in C where the user forgot to specify the tag.
550 DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) {
551 // Do a tag name lookup in this scope.
552 LookupResult R(*this, &II, SourceLocation(), LookupTagName);
553 LookupName(R, S, false);
554 R.suppressDiagnostics();
555 if (R.getResultKind() == LookupResult::Found)
556 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) {
557 switch (TD->getTagKind()) {
558 case TTK_Struct: return DeclSpec::TST_struct;
559 case TTK_Interface: return DeclSpec::TST_interface;
560 case TTK_Union: return DeclSpec::TST_union;
561 case TTK_Class: return DeclSpec::TST_class;
562 case TTK_Enum: return DeclSpec::TST_enum;
566 return DeclSpec::TST_unspecified;
569 /// isMicrosoftMissingTypename - In Microsoft mode, within class scope,
570 /// if a CXXScopeSpec's type is equal to the type of one of the base classes
571 /// then downgrade the missing typename error to a warning.
572 /// This is needed for MSVC compatibility; Example:
574 /// template<class T> class A {
576 /// typedef int TYPE;
578 /// template<class T> class B : public A<T> {
580 /// A<T>::TYPE a; // no typename required because A<T> is a base class.
583 bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) {
584 if (CurContext->isRecord()) {
585 if (SS->getScopeRep()->getKind() == NestedNameSpecifier::Super)
588 const Type *Ty = SS->getScopeRep()->getAsType();
590 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext);
591 for (const auto &Base : RD->bases())
592 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base.getType()))
594 return S->isFunctionPrototypeScope();
596 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope();
599 void Sema::DiagnoseUnknownTypeName(IdentifierInfo *&II,
600 SourceLocation IILoc,
603 ParsedType &SuggestedType,
604 bool AllowClassTemplates) {
605 // We don't have anything to suggest (yet).
606 SuggestedType = nullptr;
608 // There may have been a typo in the name of the type. Look up typo
609 // results, in case we have something that we can suggest.
610 if (TypoCorrection Corrected =
611 CorrectTypo(DeclarationNameInfo(II, IILoc), LookupOrdinaryName, S, SS,
612 llvm::make_unique<TypeNameValidatorCCC>(
613 false, false, AllowClassTemplates),
614 CTK_ErrorRecovery)) {
615 if (Corrected.isKeyword()) {
616 // We corrected to a keyword.
617 diagnoseTypo(Corrected, PDiag(diag::err_unknown_typename_suggest) << II);
618 II = Corrected.getCorrectionAsIdentifierInfo();
620 // We found a similarly-named type or interface; suggest that.
621 if (!SS || !SS->isSet()) {
622 diagnoseTypo(Corrected,
623 PDiag(diag::err_unknown_typename_suggest) << II);
624 } else if (DeclContext *DC = computeDeclContext(*SS, false)) {
625 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
626 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() &&
627 II->getName().equals(CorrectedStr);
628 diagnoseTypo(Corrected,
629 PDiag(diag::err_unknown_nested_typename_suggest)
630 << II << DC << DroppedSpecifier << SS->getRange());
632 llvm_unreachable("could not have corrected a typo here");
636 if (Corrected.getCorrectionSpecifier())
637 tmpSS.MakeTrivial(Context, Corrected.getCorrectionSpecifier(),
640 getTypeName(*Corrected.getCorrectionAsIdentifierInfo(), IILoc, S,
641 tmpSS.isSet() ? &tmpSS : SS, false, false, nullptr,
642 /*IsCtorOrDtorName=*/false,
643 /*NonTrivialTypeSourceInfo=*/true);
648 if (getLangOpts().CPlusPlus) {
649 // See if II is a class template that the user forgot to pass arguments to.
651 Name.setIdentifier(II, IILoc);
652 CXXScopeSpec EmptySS;
653 TemplateTy TemplateResult;
654 bool MemberOfUnknownSpecialization;
655 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false,
656 Name, nullptr, true, TemplateResult,
657 MemberOfUnknownSpecialization) == TNK_Type_template) {
658 TemplateName TplName = TemplateResult.get();
659 Diag(IILoc, diag::err_template_missing_args) << TplName;
660 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) {
661 Diag(TplDecl->getLocation(), diag::note_template_decl_here)
662 << TplDecl->getTemplateParameters()->getSourceRange();
668 // FIXME: Should we move the logic that tries to recover from a missing tag
669 // (struct, union, enum) from Parser::ParseImplicitInt here, instead?
671 if (!SS || (!SS->isSet() && !SS->isInvalid()))
672 Diag(IILoc, diag::err_unknown_typename) << II;
673 else if (DeclContext *DC = computeDeclContext(*SS, false))
674 Diag(IILoc, diag::err_typename_nested_not_found)
675 << II << DC << SS->getRange();
676 else if (isDependentScopeSpecifier(*SS)) {
677 unsigned DiagID = diag::err_typename_missing;
678 if (getLangOpts().MSVCCompat && isMicrosoftMissingTypename(SS, S))
679 DiagID = diag::ext_typename_missing;
681 Diag(SS->getRange().getBegin(), DiagID)
682 << SS->getScopeRep() << II->getName()
683 << SourceRange(SS->getRange().getBegin(), IILoc)
684 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename ");
685 SuggestedType = ActOnTypenameType(S, SourceLocation(),
686 *SS, *II, IILoc).get();
688 assert(SS && SS->isInvalid() &&
689 "Invalid scope specifier has already been diagnosed");
693 /// \brief Determine whether the given result set contains either a type name
695 static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) {
696 bool CheckTemplate = R.getSema().getLangOpts().CPlusPlus &&
697 NextToken.is(tok::less);
699 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) {
700 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I))
703 if (CheckTemplate && isa<TemplateDecl>(*I))
710 static bool isTagTypeWithMissingTag(Sema &SemaRef, LookupResult &Result,
711 Scope *S, CXXScopeSpec &SS,
712 IdentifierInfo *&Name,
713 SourceLocation NameLoc) {
714 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupTagName);
715 SemaRef.LookupParsedName(R, S, &SS);
716 if (TagDecl *Tag = R.getAsSingle<TagDecl>()) {
717 StringRef FixItTagName;
718 switch (Tag->getTagKind()) {
720 FixItTagName = "class ";
724 FixItTagName = "enum ";
728 FixItTagName = "struct ";
732 FixItTagName = "__interface ";
736 FixItTagName = "union ";
740 StringRef TagName = FixItTagName.drop_back();
741 SemaRef.Diag(NameLoc, diag::err_use_of_tag_name_without_tag)
742 << Name << TagName << SemaRef.getLangOpts().CPlusPlus
743 << FixItHint::CreateInsertion(NameLoc, FixItTagName);
745 for (LookupResult::iterator I = Result.begin(), IEnd = Result.end();
747 SemaRef.Diag((*I)->getLocation(), diag::note_decl_hiding_tag_type)
750 // Replace lookup results with just the tag decl.
751 Result.clear(Sema::LookupTagName);
752 SemaRef.LookupParsedName(Result, S, &SS);
759 /// Build a ParsedType for a simple-type-specifier with a nested-name-specifier.
760 static ParsedType buildNestedType(Sema &S, CXXScopeSpec &SS,
761 QualType T, SourceLocation NameLoc) {
762 ASTContext &Context = S.Context;
764 TypeLocBuilder Builder;
765 Builder.pushTypeSpec(T).setNameLoc(NameLoc);
767 T = S.getElaboratedType(ETK_None, SS, T);
768 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T);
769 ElabTL.setElaboratedKeywordLoc(SourceLocation());
770 ElabTL.setQualifierLoc(SS.getWithLocInContext(Context));
771 return S.CreateParsedType(T, Builder.getTypeSourceInfo(Context, T));
774 Sema::NameClassification
775 Sema::ClassifyName(Scope *S, CXXScopeSpec &SS, IdentifierInfo *&Name,
776 SourceLocation NameLoc, const Token &NextToken,
777 bool IsAddressOfOperand,
778 std::unique_ptr<CorrectionCandidateCallback> CCC) {
779 DeclarationNameInfo NameInfo(Name, NameLoc);
780 ObjCMethodDecl *CurMethod = getCurMethodDecl();
782 if (NextToken.is(tok::coloncolon)) {
783 NestedNameSpecInfo IdInfo(Name, NameLoc, NextToken.getLocation());
784 BuildCXXNestedNameSpecifier(S, IdInfo, false, SS, nullptr, false);
787 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
788 LookupParsedName(Result, S, &SS, !CurMethod);
790 // For unqualified lookup in a class template in MSVC mode, look into
791 // dependent base classes where the primary class template is known.
792 if (Result.empty() && SS.isEmpty() && getLangOpts().MSVCCompat) {
793 if (ParsedType TypeInBase =
794 recoverFromTypeInKnownDependentBase(*this, *Name, NameLoc))
798 // Perform lookup for Objective-C instance variables (including automatically
799 // synthesized instance variables), if we're in an Objective-C method.
800 // FIXME: This lookup really, really needs to be folded in to the normal
801 // unqualified lookup mechanism.
802 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) {
803 ExprResult E = LookupInObjCMethod(Result, S, Name, true);
804 if (E.get() || E.isInvalid())
808 bool SecondTry = false;
809 bool IsFilteredTemplateName = false;
812 switch (Result.getResultKind()) {
813 case LookupResult::NotFound:
814 // If an unqualified-id is followed by a '(', then we have a function
816 if (!SS.isSet() && NextToken.is(tok::l_paren)) {
817 // In C++, this is an ADL-only call.
819 if (getLangOpts().CPlusPlus)
820 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true);
823 // If the expression that precedes the parenthesized argument list in a
824 // function call consists solely of an identifier, and if no
825 // declaration is visible for this identifier, the identifier is
826 // implicitly declared exactly as if, in the innermost block containing
827 // the function call, the declaration
829 // extern int identifier ();
833 // We also allow this in C99 as an extension.
834 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) {
836 Result.resolveKind();
837 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false);
841 // In C, we first see whether there is a tag type by the same name, in
842 // which case it's likely that the user just forgot to write "enum",
843 // "struct", or "union".
844 if (!getLangOpts().CPlusPlus && !SecondTry &&
845 isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) {
849 // Perform typo correction to determine if there is another name that is
850 // close to this name.
851 if (!SecondTry && CCC) {
853 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(),
854 Result.getLookupKind(), S,
856 CTK_ErrorRecovery)) {
857 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest;
858 unsigned QualifiedDiag = diag::err_no_member_suggest;
860 NamedDecl *FirstDecl = Corrected.getFoundDecl();
861 NamedDecl *UnderlyingFirstDecl = Corrected.getCorrectionDecl();
862 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) &&
863 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) {
864 UnqualifiedDiag = diag::err_no_template_suggest;
865 QualifiedDiag = diag::err_no_member_template_suggest;
866 } else if (UnderlyingFirstDecl &&
867 (isa<TypeDecl>(UnderlyingFirstDecl) ||
868 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) ||
869 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) {
870 UnqualifiedDiag = diag::err_unknown_typename_suggest;
871 QualifiedDiag = diag::err_unknown_nested_typename_suggest;
875 diagnoseTypo(Corrected, PDiag(UnqualifiedDiag) << Name);
876 } else {// FIXME: is this even reachable? Test it.
877 std::string CorrectedStr(Corrected.getAsString(getLangOpts()));
878 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() &&
879 Name->getName().equals(CorrectedStr);
880 diagnoseTypo(Corrected, PDiag(QualifiedDiag)
881 << Name << computeDeclContext(SS, false)
882 << DroppedSpecifier << SS.getRange());
885 // Update the name, so that the caller has the new name.
886 Name = Corrected.getCorrectionAsIdentifierInfo();
888 // Typo correction corrected to a keyword.
889 if (Corrected.isKeyword())
892 // Also update the LookupResult...
893 // FIXME: This should probably go away at some point
895 Result.setLookupName(Corrected.getCorrection());
897 Result.addDecl(FirstDecl);
899 // If we found an Objective-C instance variable, let
900 // LookupInObjCMethod build the appropriate expression to
901 // reference the ivar.
902 // FIXME: This is a gross hack.
903 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) {
905 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier()));
913 // We failed to correct; just fall through and let the parser deal with it.
914 Result.suppressDiagnostics();
915 return NameClassification::Unknown();
917 case LookupResult::NotFoundInCurrentInstantiation: {
918 // We performed name lookup into the current instantiation, and there were
919 // dependent bases, so we treat this result the same way as any other
920 // dependent nested-name-specifier.
923 // A name used in a template declaration or definition and that is
924 // dependent on a template-parameter is assumed not to name a type
925 // unless the applicable name lookup finds a type name or the name is
926 // qualified by the keyword typename.
928 // FIXME: If the next token is '<', we might want to ask the parser to
929 // perform some heroics to see if we actually have a
930 // template-argument-list, which would indicate a missing 'template'
932 return ActOnDependentIdExpression(SS, /*TemplateKWLoc=*/SourceLocation(),
933 NameInfo, IsAddressOfOperand,
934 /*TemplateArgs=*/nullptr);
937 case LookupResult::Found:
938 case LookupResult::FoundOverloaded:
939 case LookupResult::FoundUnresolvedValue:
942 case LookupResult::Ambiguous:
943 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) &&
944 hasAnyAcceptableTemplateNames(Result)) {
945 // C++ [temp.local]p3:
946 // A lookup that finds an injected-class-name (10.2) can result in an
947 // ambiguity in certain cases (for example, if it is found in more than
948 // one base class). If all of the injected-class-names that are found
949 // refer to specializations of the same class template, and if the name
950 // is followed by a template-argument-list, the reference refers to the
951 // class template itself and not a specialization thereof, and is not
954 // This filtering can make an ambiguous result into an unambiguous one,
955 // so try again after filtering out template names.
956 FilterAcceptableTemplateNames(Result);
957 if (!Result.isAmbiguous()) {
958 IsFilteredTemplateName = true;
963 // Diagnose the ambiguity and return an error.
964 return NameClassification::Error();
967 if (getLangOpts().CPlusPlus && NextToken.is(tok::less) &&
968 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) {
969 // C++ [temp.names]p3:
970 // After name lookup (3.4) finds that a name is a template-name or that
971 // an operator-function-id or a literal- operator-id refers to a set of
972 // overloaded functions any member of which is a function template if
973 // this is followed by a <, the < is always taken as the delimiter of a
974 // template-argument-list and never as the less-than operator.
975 if (!IsFilteredTemplateName)
976 FilterAcceptableTemplateNames(Result);
978 if (!Result.empty()) {
979 bool IsFunctionTemplate;
981 TemplateName Template;
982 if (Result.end() - Result.begin() > 1) {
983 IsFunctionTemplate = true;
984 Template = Context.getOverloadedTemplateName(Result.begin(),
988 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl());
989 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD);
990 IsVarTemplate = isa<VarTemplateDecl>(TD);
992 if (SS.isSet() && !SS.isInvalid())
993 Template = Context.getQualifiedTemplateName(SS.getScopeRep(),
994 /*TemplateKeyword=*/false,
997 Template = TemplateName(TD);
1000 if (IsFunctionTemplate) {
1001 // Function templates always go through overload resolution, at which
1002 // point we'll perform the various checks (e.g., accessibility) we need
1003 // to based on which function we selected.
1004 Result.suppressDiagnostics();
1006 return NameClassification::FunctionTemplate(Template);
1009 return IsVarTemplate ? NameClassification::VarTemplate(Template)
1010 : NameClassification::TypeTemplate(Template);
1014 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl();
1015 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) {
1016 DiagnoseUseOfDecl(Type, NameLoc);
1017 MarkAnyDeclReferenced(Type->getLocation(), Type, /*OdrUse=*/false);
1018 QualType T = Context.getTypeDeclType(Type);
1019 if (SS.isNotEmpty())
1020 return buildNestedType(*this, SS, T, NameLoc);
1021 return ParsedType::make(T);
1024 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl);
1026 // FIXME: It's unfortunate that we don't have a Type node for handling this.
1027 if (ObjCCompatibleAliasDecl *Alias =
1028 dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl))
1029 Class = Alias->getClassInterface();
1033 DiagnoseUseOfDecl(Class, NameLoc);
1035 if (NextToken.is(tok::period)) {
1036 // Interface. <something> is parsed as a property reference expression.
1037 // Just return "unknown" as a fall-through for now.
1038 Result.suppressDiagnostics();
1039 return NameClassification::Unknown();
1042 QualType T = Context.getObjCInterfaceType(Class);
1043 return ParsedType::make(T);
1046 // We can have a type template here if we're classifying a template argument.
1047 if (isa<TemplateDecl>(FirstDecl) && !isa<FunctionTemplateDecl>(FirstDecl))
1048 return NameClassification::TypeTemplate(
1049 TemplateName(cast<TemplateDecl>(FirstDecl)));
1051 // Check for a tag type hidden by a non-type decl in a few cases where it
1052 // seems likely a type is wanted instead of the non-type that was found.
1053 bool NextIsOp = NextToken.isOneOf(tok::amp, tok::star);
1054 if ((NextToken.is(tok::identifier) ||
1056 FirstDecl->getUnderlyingDecl()->isFunctionOrFunctionTemplate())) &&
1057 isTagTypeWithMissingTag(*this, Result, S, SS, Name, NameLoc)) {
1058 TypeDecl *Type = Result.getAsSingle<TypeDecl>();
1059 DiagnoseUseOfDecl(Type, NameLoc);
1060 QualType T = Context.getTypeDeclType(Type);
1061 if (SS.isNotEmpty())
1062 return buildNestedType(*this, SS, T, NameLoc);
1063 return ParsedType::make(T);
1066 if (FirstDecl->isCXXClassMember())
1067 return BuildPossibleImplicitMemberExpr(SS, SourceLocation(), Result,
1070 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren));
1071 return BuildDeclarationNameExpr(SS, Result, ADL);
1074 // Determines the context to return to after temporarily entering a
1075 // context. This depends in an unnecessarily complicated way on the
1076 // exact ordering of callbacks from the parser.
1077 DeclContext *Sema::getContainingDC(DeclContext *DC) {
1079 // Functions defined inline within classes aren't parsed until we've
1080 // finished parsing the top-level class, so the top-level class is
1081 // the context we'll need to return to.
1082 // A Lambda call operator whose parent is a class must not be treated
1083 // as an inline member function. A Lambda can be used legally
1084 // either as an in-class member initializer or a default argument. These
1085 // are parsed once the class has been marked complete and so the containing
1086 // context would be the nested class (when the lambda is defined in one);
1087 // If the class is not complete, then the lambda is being used in an
1088 // ill-formed fashion (such as to specify the width of a bit-field, or
1089 // in an array-bound) - in which case we still want to return the
1090 // lexically containing DC (which could be a nested class).
1091 if (isa<FunctionDecl>(DC) && !isLambdaCallOperator(DC)) {
1092 DC = DC->getLexicalParent();
1094 // A function not defined within a class will always return to its
1096 if (!isa<CXXRecordDecl>(DC))
1099 // A C++ inline method/friend is parsed *after* the topmost class
1100 // it was declared in is fully parsed ("complete"); the topmost
1101 // class is the context we need to return to.
1102 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent()))
1105 // Return the declaration context of the topmost class the inline method is
1110 return DC->getLexicalParent();
1113 void Sema::PushDeclContext(Scope *S, DeclContext *DC) {
1114 assert(getContainingDC(DC) == CurContext &&
1115 "The next DeclContext should be lexically contained in the current one.");
1120 void Sema::PopDeclContext() {
1121 assert(CurContext && "DeclContext imbalance!");
1123 CurContext = getContainingDC(CurContext);
1124 assert(CurContext && "Popped translation unit!");
1127 Sema::SkippedDefinitionContext Sema::ActOnTagStartSkippedDefinition(Scope *S,
1129 // Unlike PushDeclContext, the context to which we return is not necessarily
1130 // the containing DC of TD, because the new context will be some pre-existing
1131 // TagDecl definition instead of a fresh one.
1132 auto Result = static_cast<SkippedDefinitionContext>(CurContext);
1133 CurContext = cast<TagDecl>(D)->getDefinition();
1134 assert(CurContext && "skipping definition of undefined tag");
1135 // Start lookups from the parent of the current context; we don't want to look
1136 // into the pre-existing complete definition.
1137 S->setEntity(CurContext->getLookupParent());
1141 void Sema::ActOnTagFinishSkippedDefinition(SkippedDefinitionContext Context) {
1142 CurContext = static_cast<decltype(CurContext)>(Context);
1145 /// EnterDeclaratorContext - Used when we must lookup names in the context
1146 /// of a declarator's nested name specifier.
1148 void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) {
1149 // C++0x [basic.lookup.unqual]p13:
1150 // A name used in the definition of a static data member of class
1151 // X (after the qualified-id of the static member) is looked up as
1152 // if the name was used in a member function of X.
1153 // C++0x [basic.lookup.unqual]p14:
1154 // If a variable member of a namespace is defined outside of the
1155 // scope of its namespace then any name used in the definition of
1156 // the variable member (after the declarator-id) is looked up as
1157 // if the definition of the variable member occurred in its
1159 // Both of these imply that we should push a scope whose context
1160 // is the semantic context of the declaration. We can't use
1161 // PushDeclContext here because that context is not necessarily
1162 // lexically contained in the current context. Fortunately,
1163 // the containing scope should have the appropriate information.
1165 assert(!S->getEntity() && "scope already has entity");
1168 Scope *Ancestor = S->getParent();
1169 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
1170 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch");
1177 void Sema::ExitDeclaratorContext(Scope *S) {
1178 assert(S->getEntity() == CurContext && "Context imbalance!");
1180 // Switch back to the lexical context. The safety of this is
1181 // enforced by an assert in EnterDeclaratorContext.
1182 Scope *Ancestor = S->getParent();
1183 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
1184 CurContext = Ancestor->getEntity();
1186 // We don't need to do anything with the scope, which is going to
1190 void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) {
1191 // We assume that the caller has already called
1192 // ActOnReenterTemplateScope so getTemplatedDecl() works.
1193 FunctionDecl *FD = D->getAsFunction();
1197 // Same implementation as PushDeclContext, but enters the context
1198 // from the lexical parent, rather than the top-level class.
1199 assert(CurContext == FD->getLexicalParent() &&
1200 "The next DeclContext should be lexically contained in the current one.");
1202 S->setEntity(CurContext);
1204 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) {
1205 ParmVarDecl *Param = FD->getParamDecl(P);
1206 // If the parameter has an identifier, then add it to the scope
1207 if (Param->getIdentifier()) {
1209 IdResolver.AddDecl(Param);
1214 void Sema::ActOnExitFunctionContext() {
1215 // Same implementation as PopDeclContext, but returns to the lexical parent,
1216 // rather than the top-level class.
1217 assert(CurContext && "DeclContext imbalance!");
1218 CurContext = CurContext->getLexicalParent();
1219 assert(CurContext && "Popped translation unit!");
1222 /// \brief Determine whether we allow overloading of the function
1223 /// PrevDecl with another declaration.
1225 /// This routine determines whether overloading is possible, not
1226 /// whether some new function is actually an overload. It will return
1227 /// true in C++ (where we can always provide overloads) or, as an
1228 /// extension, in C when the previous function is already an
1229 /// overloaded function declaration or has the "overloadable"
1231 static bool AllowOverloadingOfFunction(LookupResult &Previous,
1232 ASTContext &Context) {
1233 if (Context.getLangOpts().CPlusPlus)
1236 if (Previous.getResultKind() == LookupResult::FoundOverloaded)
1239 return (Previous.getResultKind() == LookupResult::Found
1240 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>());
1243 /// Add this decl to the scope shadowed decl chains.
1244 void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) {
1245 // Move up the scope chain until we find the nearest enclosing
1246 // non-transparent context. The declaration will be introduced into this
1248 while (S->getEntity() && S->getEntity()->isTransparentContext())
1251 // Add scoped declarations into their context, so that they can be
1252 // found later. Declarations without a context won't be inserted
1253 // into any context.
1255 CurContext->addDecl(D);
1257 // Out-of-line definitions shouldn't be pushed into scope in C++, unless they
1258 // are function-local declarations.
1259 if (getLangOpts().CPlusPlus && D->isOutOfLine() &&
1260 !D->getDeclContext()->getRedeclContext()->Equals(
1261 D->getLexicalDeclContext()->getRedeclContext()) &&
1262 !D->getLexicalDeclContext()->isFunctionOrMethod())
1265 // Template instantiations should also not be pushed into scope.
1266 if (isa<FunctionDecl>(D) &&
1267 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization())
1270 // If this replaces anything in the current scope,
1271 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()),
1272 IEnd = IdResolver.end();
1273 for (; I != IEnd; ++I) {
1274 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) {
1276 IdResolver.RemoveDecl(*I);
1278 // Should only need to replace one decl.
1285 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) {
1286 // Implicitly-generated labels may end up getting generated in an order that
1287 // isn't strictly lexical, which breaks name lookup. Be careful to insert
1288 // the label at the appropriate place in the identifier chain.
1289 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) {
1290 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext();
1291 if (IDC == CurContext) {
1292 if (!S->isDeclScope(*I))
1294 } else if (IDC->Encloses(CurContext))
1298 IdResolver.InsertDeclAfter(I, D);
1300 IdResolver.AddDecl(D);
1304 void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) {
1305 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope)
1306 TUScope->AddDecl(D);
1309 bool Sema::isDeclInScope(NamedDecl *D, DeclContext *Ctx, Scope *S,
1310 bool AllowInlineNamespace) {
1311 return IdResolver.isDeclInScope(D, Ctx, S, AllowInlineNamespace);
1314 Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) {
1315 DeclContext *TargetDC = DC->getPrimaryContext();
1317 if (DeclContext *ScopeDC = S->getEntity())
1318 if (ScopeDC->getPrimaryContext() == TargetDC)
1320 } while ((S = S->getParent()));
1325 static bool isOutOfScopePreviousDeclaration(NamedDecl *,
1329 /// Filters out lookup results that don't fall within the given scope
1330 /// as determined by isDeclInScope.
1331 void Sema::FilterLookupForScope(LookupResult &R, DeclContext *Ctx, Scope *S,
1332 bool ConsiderLinkage,
1333 bool AllowInlineNamespace) {
1334 LookupResult::Filter F = R.makeFilter();
1335 while (F.hasNext()) {
1336 NamedDecl *D = F.next();
1338 if (isDeclInScope(D, Ctx, S, AllowInlineNamespace))
1341 if (ConsiderLinkage && isOutOfScopePreviousDeclaration(D, Ctx, Context))
1350 static bool isUsingDecl(NamedDecl *D) {
1351 return isa<UsingShadowDecl>(D) ||
1352 isa<UnresolvedUsingTypenameDecl>(D) ||
1353 isa<UnresolvedUsingValueDecl>(D);
1356 /// Removes using shadow declarations from the lookup results.
1357 static void RemoveUsingDecls(LookupResult &R) {
1358 LookupResult::Filter F = R.makeFilter();
1360 if (isUsingDecl(F.next()))
1366 /// \brief Check for this common pattern:
1369 /// S(const S&); // DO NOT IMPLEMENT
1370 /// void operator=(const S&); // DO NOT IMPLEMENT
1373 static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) {
1374 // FIXME: Should check for private access too but access is set after we get
1376 if (D->doesThisDeclarationHaveABody())
1379 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D))
1380 return CD->isCopyConstructor();
1381 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
1382 return Method->isCopyAssignmentOperator();
1386 // We need this to handle
1389 // void *foo() { return 0; }
1392 // When we see foo we don't know if after the typedef we will get 'A' or '*A'
1393 // for example. If 'A', foo will have external linkage. If we have '*A',
1394 // foo will have no linkage. Since we can't know until we get to the end
1395 // of the typedef, this function finds out if D might have non-external linkage.
1396 // Callers should verify at the end of the TU if it D has external linkage or
1398 bool Sema::mightHaveNonExternalLinkage(const DeclaratorDecl *D) {
1399 const DeclContext *DC = D->getDeclContext();
1400 while (!DC->isTranslationUnit()) {
1401 if (const RecordDecl *RD = dyn_cast<RecordDecl>(DC)){
1402 if (!RD->hasNameForLinkage())
1405 DC = DC->getParent();
1408 return !D->isExternallyVisible();
1411 // FIXME: This needs to be refactored; some other isInMainFile users want
1413 static bool isMainFileLoc(const Sema &S, SourceLocation Loc) {
1414 if (S.TUKind != TU_Complete)
1416 return S.SourceMgr.isInMainFile(Loc);
1419 bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const {
1422 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>())
1425 // Ignore all entities declared within templates, and out-of-line definitions
1426 // of members of class templates.
1427 if (D->getDeclContext()->isDependentContext() ||
1428 D->getLexicalDeclContext()->isDependentContext())
1431 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
1432 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
1435 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
1436 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD))
1439 // 'static inline' functions are defined in headers; don't warn.
1440 if (FD->isInlined() && !isMainFileLoc(*this, FD->getLocation()))
1444 if (FD->doesThisDeclarationHaveABody() &&
1445 Context.DeclMustBeEmitted(FD))
1447 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1448 // Constants and utility variables are defined in headers with internal
1449 // linkage; don't warn. (Unlike functions, there isn't a convenient marker
1451 if (!isMainFileLoc(*this, VD->getLocation()))
1454 if (Context.DeclMustBeEmitted(VD))
1457 if (VD->isStaticDataMember() &&
1458 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
1461 if (VD->isInline() && !isMainFileLoc(*this, VD->getLocation()))
1467 // Only warn for unused decls internal to the translation unit.
1468 // FIXME: This seems like a bogus check; it suppresses -Wunused-function
1469 // for inline functions defined in the main source file, for instance.
1470 return mightHaveNonExternalLinkage(D);
1473 void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) {
1477 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
1478 const FunctionDecl *First = FD->getFirstDecl();
1479 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First))
1480 return; // First should already be in the vector.
1483 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1484 const VarDecl *First = VD->getFirstDecl();
1485 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First))
1486 return; // First should already be in the vector.
1489 if (ShouldWarnIfUnusedFileScopedDecl(D))
1490 UnusedFileScopedDecls.push_back(D);
1493 static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) {
1494 if (D->isInvalidDecl())
1497 if (D->isReferenced() || D->isUsed() || D->hasAttr<UnusedAttr>() ||
1498 D->hasAttr<ObjCPreciseLifetimeAttr>())
1501 if (isa<LabelDecl>(D))
1504 // Except for labels, we only care about unused decls that are local to
1506 bool WithinFunction = D->getDeclContext()->isFunctionOrMethod();
1507 if (const auto *R = dyn_cast<CXXRecordDecl>(D->getDeclContext()))
1508 // For dependent types, the diagnostic is deferred.
1510 WithinFunction || (R->isLocalClass() && !R->isDependentType());
1511 if (!WithinFunction)
1514 if (isa<TypedefNameDecl>(D))
1517 // White-list anything that isn't a local variable.
1518 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D))
1521 // Types of valid local variables should be complete, so this should succeed.
1522 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1524 // White-list anything with an __attribute__((unused)) type.
1525 const auto *Ty = VD->getType().getTypePtr();
1527 // Only look at the outermost level of typedef.
1528 if (const TypedefType *TT = Ty->getAs<TypedefType>()) {
1529 if (TT->getDecl()->hasAttr<UnusedAttr>())
1533 // If we failed to complete the type for some reason, or if the type is
1534 // dependent, don't diagnose the variable.
1535 if (Ty->isIncompleteType() || Ty->isDependentType())
1538 // Look at the element type to ensure that the warning behaviour is
1539 // consistent for both scalars and arrays.
1540 Ty = Ty->getBaseElementTypeUnsafe();
1542 if (const TagType *TT = Ty->getAs<TagType>()) {
1543 const TagDecl *Tag = TT->getDecl();
1544 if (Tag->hasAttr<UnusedAttr>())
1547 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) {
1548 if (!RD->hasTrivialDestructor() && !RD->hasAttr<WarnUnusedAttr>())
1551 if (const Expr *Init = VD->getInit()) {
1552 if (const ExprWithCleanups *Cleanups =
1553 dyn_cast<ExprWithCleanups>(Init))
1554 Init = Cleanups->getSubExpr();
1555 const CXXConstructExpr *Construct =
1556 dyn_cast<CXXConstructExpr>(Init);
1557 if (Construct && !Construct->isElidable()) {
1558 CXXConstructorDecl *CD = Construct->getConstructor();
1559 if (!CD->isTrivial() && !RD->hasAttr<WarnUnusedAttr>())
1566 // TODO: __attribute__((unused)) templates?
1572 static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx,
1574 if (isa<LabelDecl>(D)) {
1575 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(),
1576 tok::colon, Ctx.getSourceManager(), Ctx.getLangOpts(), true);
1577 if (AfterColon.isInvalid())
1579 Hint = FixItHint::CreateRemoval(CharSourceRange::
1580 getCharRange(D->getLocStart(), AfterColon));
1584 void Sema::DiagnoseUnusedNestedTypedefs(const RecordDecl *D) {
1585 if (D->getTypeForDecl()->isDependentType())
1588 for (auto *TmpD : D->decls()) {
1589 if (const auto *T = dyn_cast<TypedefNameDecl>(TmpD))
1590 DiagnoseUnusedDecl(T);
1591 else if(const auto *R = dyn_cast<RecordDecl>(TmpD))
1592 DiagnoseUnusedNestedTypedefs(R);
1596 /// DiagnoseUnusedDecl - Emit warnings about declarations that are not used
1597 /// unless they are marked attr(unused).
1598 void Sema::DiagnoseUnusedDecl(const NamedDecl *D) {
1599 if (!ShouldDiagnoseUnusedDecl(D))
1602 if (auto *TD = dyn_cast<TypedefNameDecl>(D)) {
1603 // typedefs can be referenced later on, so the diagnostics are emitted
1604 // at end-of-translation-unit.
1605 UnusedLocalTypedefNameCandidates.insert(TD);
1610 GenerateFixForUnusedDecl(D, Context, Hint);
1613 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable())
1614 DiagID = diag::warn_unused_exception_param;
1615 else if (isa<LabelDecl>(D))
1616 DiagID = diag::warn_unused_label;
1618 DiagID = diag::warn_unused_variable;
1620 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint;
1623 static void CheckPoppedLabel(LabelDecl *L, Sema &S) {
1624 // Verify that we have no forward references left. If so, there was a goto
1625 // or address of a label taken, but no definition of it. Label fwd
1626 // definitions are indicated with a null substmt which is also not a resolved
1627 // MS inline assembly label name.
1628 bool Diagnose = false;
1629 if (L->isMSAsmLabel())
1630 Diagnose = !L->isResolvedMSAsmLabel();
1632 Diagnose = L->getStmt() == nullptr;
1634 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName();
1637 void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) {
1638 S->mergeNRVOIntoParent();
1640 if (S->decl_empty()) return;
1641 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) &&
1642 "Scope shouldn't contain decls!");
1644 for (auto *TmpD : S->decls()) {
1645 assert(TmpD && "This decl didn't get pushed??");
1647 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?");
1648 NamedDecl *D = cast<NamedDecl>(TmpD);
1650 if (!D->getDeclName()) continue;
1652 // Diagnose unused variables in this scope.
1653 if (!S->hasUnrecoverableErrorOccurred()) {
1654 DiagnoseUnusedDecl(D);
1655 if (const auto *RD = dyn_cast<RecordDecl>(D))
1656 DiagnoseUnusedNestedTypedefs(RD);
1659 // If this was a forward reference to a label, verify it was defined.
1660 if (LabelDecl *LD = dyn_cast<LabelDecl>(D))
1661 CheckPoppedLabel(LD, *this);
1663 // Remove this name from our lexical scope, and warn on it if we haven't
1665 IdResolver.RemoveDecl(D);
1666 auto ShadowI = ShadowingDecls.find(D);
1667 if (ShadowI != ShadowingDecls.end()) {
1668 if (const auto *FD = dyn_cast<FieldDecl>(ShadowI->second)) {
1669 Diag(D->getLocation(), diag::warn_ctor_parm_shadows_field)
1670 << D << FD << FD->getParent();
1671 Diag(FD->getLocation(), diag::note_previous_declaration);
1673 ShadowingDecls.erase(ShadowI);
1678 /// \brief Look for an Objective-C class in the translation unit.
1680 /// \param Id The name of the Objective-C class we're looking for. If
1681 /// typo-correction fixes this name, the Id will be updated
1682 /// to the fixed name.
1684 /// \param IdLoc The location of the name in the translation unit.
1686 /// \param DoTypoCorrection If true, this routine will attempt typo correction
1687 /// if there is no class with the given name.
1689 /// \returns The declaration of the named Objective-C class, or NULL if the
1690 /// class could not be found.
1691 ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id,
1692 SourceLocation IdLoc,
1693 bool DoTypoCorrection) {
1694 // The third "scope" argument is 0 since we aren't enabling lazy built-in
1695 // creation from this context.
1696 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName);
1698 if (!IDecl && DoTypoCorrection) {
1699 // Perform typo correction at the given location, but only if we
1700 // find an Objective-C class name.
1701 if (TypoCorrection C = CorrectTypo(
1702 DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, TUScope, nullptr,
1703 llvm::make_unique<DeclFilterCCC<ObjCInterfaceDecl>>(),
1704 CTK_ErrorRecovery)) {
1705 diagnoseTypo(C, PDiag(diag::err_undef_interface_suggest) << Id);
1706 IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>();
1707 Id = IDecl->getIdentifier();
1710 ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl);
1711 // This routine must always return a class definition, if any.
1712 if (Def && Def->getDefinition())
1713 Def = Def->getDefinition();
1717 /// getNonFieldDeclScope - Retrieves the innermost scope, starting
1718 /// from S, where a non-field would be declared. This routine copes
1719 /// with the difference between C and C++ scoping rules in structs and
1720 /// unions. For example, the following code is well-formed in C but
1721 /// ill-formed in C++:
1727 /// void test_S6() {
1732 /// For the declaration of BAR, this routine will return a different
1733 /// scope. The scope S will be the scope of the unnamed enumeration
1734 /// within S6. In C++, this routine will return the scope associated
1735 /// with S6, because the enumeration's scope is a transparent
1736 /// context but structures can contain non-field names. In C, this
1737 /// routine will return the translation unit scope, since the
1738 /// enumeration's scope is a transparent context and structures cannot
1739 /// contain non-field names.
1740 Scope *Sema::getNonFieldDeclScope(Scope *S) {
1741 while (((S->getFlags() & Scope::DeclScope) == 0) ||
1742 (S->getEntity() && S->getEntity()->isTransparentContext()) ||
1743 (S->isClassScope() && !getLangOpts().CPlusPlus))
1748 /// \brief Looks up the declaration of "struct objc_super" and
1749 /// saves it for later use in building builtin declaration of
1750 /// objc_msgSendSuper and objc_msgSendSuper_stret. If no such
1751 /// pre-existing declaration exists no action takes place.
1752 static void LookupPredefedObjCSuperType(Sema &ThisSema, Scope *S,
1753 IdentifierInfo *II) {
1754 if (!II->isStr("objc_msgSendSuper"))
1756 ASTContext &Context = ThisSema.Context;
1758 LookupResult Result(ThisSema, &Context.Idents.get("objc_super"),
1759 SourceLocation(), Sema::LookupTagName);
1760 ThisSema.LookupName(Result, S);
1761 if (Result.getResultKind() == LookupResult::Found)
1762 if (const TagDecl *TD = Result.getAsSingle<TagDecl>())
1763 Context.setObjCSuperType(Context.getTagDeclType(TD));
1766 static StringRef getHeaderName(ASTContext::GetBuiltinTypeError Error) {
1768 case ASTContext::GE_None:
1770 case ASTContext::GE_Missing_stdio:
1772 case ASTContext::GE_Missing_setjmp:
1774 case ASTContext::GE_Missing_ucontext:
1775 return "ucontext.h";
1777 llvm_unreachable("unhandled error kind");
1780 /// LazilyCreateBuiltin - The specified Builtin-ID was first used at
1781 /// file scope. lazily create a decl for it. ForRedeclaration is true
1782 /// if we're creating this built-in in anticipation of redeclaring the
1784 NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned ID,
1785 Scope *S, bool ForRedeclaration,
1786 SourceLocation Loc) {
1787 LookupPredefedObjCSuperType(*this, S, II);
1789 ASTContext::GetBuiltinTypeError Error;
1790 QualType R = Context.GetBuiltinType(ID, Error);
1792 if (ForRedeclaration)
1793 Diag(Loc, diag::warn_implicit_decl_requires_sysheader)
1794 << getHeaderName(Error) << Context.BuiltinInfo.getName(ID);
1798 if (!ForRedeclaration &&
1799 (Context.BuiltinInfo.isPredefinedLibFunction(ID) ||
1800 Context.BuiltinInfo.isHeaderDependentFunction(ID))) {
1801 Diag(Loc, diag::ext_implicit_lib_function_decl)
1802 << Context.BuiltinInfo.getName(ID) << R;
1803 if (Context.BuiltinInfo.getHeaderName(ID) &&
1804 !Diags.isIgnored(diag::ext_implicit_lib_function_decl, Loc))
1805 Diag(Loc, diag::note_include_header_or_declare)
1806 << Context.BuiltinInfo.getHeaderName(ID)
1807 << Context.BuiltinInfo.getName(ID);
1813 DeclContext *Parent = Context.getTranslationUnitDecl();
1814 if (getLangOpts().CPlusPlus) {
1815 LinkageSpecDecl *CLinkageDecl =
1816 LinkageSpecDecl::Create(Context, Parent, Loc, Loc,
1817 LinkageSpecDecl::lang_c, false);
1818 CLinkageDecl->setImplicit();
1819 Parent->addDecl(CLinkageDecl);
1820 Parent = CLinkageDecl;
1823 FunctionDecl *New = FunctionDecl::Create(Context,
1825 Loc, Loc, II, R, /*TInfo=*/nullptr,
1828 R->isFunctionProtoType());
1831 // Create Decl objects for each parameter, adding them to the
1833 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) {
1834 SmallVector<ParmVarDecl*, 16> Params;
1835 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
1837 ParmVarDecl::Create(Context, New, SourceLocation(), SourceLocation(),
1838 nullptr, FT->getParamType(i), /*TInfo=*/nullptr,
1840 parm->setScopeInfo(0, i);
1841 Params.push_back(parm);
1843 New->setParams(Params);
1846 AddKnownFunctionAttributes(New);
1847 RegisterLocallyScopedExternCDecl(New, S);
1849 // TUScope is the translation-unit scope to insert this function into.
1850 // FIXME: This is hideous. We need to teach PushOnScopeChains to
1851 // relate Scopes to DeclContexts, and probably eliminate CurContext
1852 // entirely, but we're not there yet.
1853 DeclContext *SavedContext = CurContext;
1854 CurContext = Parent;
1855 PushOnScopeChains(New, TUScope);
1856 CurContext = SavedContext;
1860 /// Typedef declarations don't have linkage, but they still denote the same
1861 /// entity if their types are the same.
1862 /// FIXME: This is notionally doing the same thing as ASTReaderDecl's
1864 static void filterNonConflictingPreviousTypedefDecls(Sema &S,
1865 TypedefNameDecl *Decl,
1866 LookupResult &Previous) {
1867 // This is only interesting when modules are enabled.
1868 if (!S.getLangOpts().Modules && !S.getLangOpts().ModulesLocalVisibility)
1871 // Empty sets are uninteresting.
1872 if (Previous.empty())
1875 LookupResult::Filter Filter = Previous.makeFilter();
1876 while (Filter.hasNext()) {
1877 NamedDecl *Old = Filter.next();
1879 // Non-hidden declarations are never ignored.
1880 if (S.isVisible(Old))
1883 // Declarations of the same entity are not ignored, even if they have
1884 // different linkages.
1885 if (auto *OldTD = dyn_cast<TypedefNameDecl>(Old)) {
1886 if (S.Context.hasSameType(OldTD->getUnderlyingType(),
1887 Decl->getUnderlyingType()))
1890 // If both declarations give a tag declaration a typedef name for linkage
1891 // purposes, then they declare the same entity.
1892 if (S.getLangOpts().CPlusPlus &&
1893 OldTD->getAnonDeclWithTypedefName(/*AnyRedecl*/true) &&
1894 Decl->getAnonDeclWithTypedefName())
1904 bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) {
1906 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old))
1907 OldType = OldTypedef->getUnderlyingType();
1909 OldType = Context.getTypeDeclType(Old);
1910 QualType NewType = New->getUnderlyingType();
1912 if (NewType->isVariablyModifiedType()) {
1913 // Must not redefine a typedef with a variably-modified type.
1914 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0;
1915 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef)
1917 if (Old->getLocation().isValid())
1918 Diag(Old->getLocation(), diag::note_previous_definition);
1919 New->setInvalidDecl();
1923 if (OldType != NewType &&
1924 !OldType->isDependentType() &&
1925 !NewType->isDependentType() &&
1926 !Context.hasSameType(OldType, NewType)) {
1927 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0;
1928 Diag(New->getLocation(), diag::err_redefinition_different_typedef)
1929 << Kind << NewType << OldType;
1930 if (Old->getLocation().isValid())
1931 Diag(Old->getLocation(), diag::note_previous_definition);
1932 New->setInvalidDecl();
1938 /// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the
1939 /// same name and scope as a previous declaration 'Old'. Figure out
1940 /// how to resolve this situation, merging decls or emitting
1941 /// diagnostics as appropriate. If there was an error, set New to be invalid.
1943 void Sema::MergeTypedefNameDecl(Scope *S, TypedefNameDecl *New,
1944 LookupResult &OldDecls) {
1945 // If the new decl is known invalid already, don't bother doing any
1947 if (New->isInvalidDecl()) return;
1949 // Allow multiple definitions for ObjC built-in typedefs.
1950 // FIXME: Verify the underlying types are equivalent!
1951 if (getLangOpts().ObjC1) {
1952 const IdentifierInfo *TypeID = New->getIdentifier();
1953 switch (TypeID->getLength()) {
1957 if (!TypeID->isStr("id"))
1959 QualType T = New->getUnderlyingType();
1960 if (!T->isPointerType())
1962 if (!T->isVoidPointerType()) {
1963 QualType PT = T->getAs<PointerType>()->getPointeeType();
1964 if (!PT->isStructureType())
1967 Context.setObjCIdRedefinitionType(T);
1968 // Install the built-in type for 'id', ignoring the current definition.
1969 New->setTypeForDecl(Context.getObjCIdType().getTypePtr());
1973 if (!TypeID->isStr("Class"))
1975 Context.setObjCClassRedefinitionType(New->getUnderlyingType());
1976 // Install the built-in type for 'Class', ignoring the current definition.
1977 New->setTypeForDecl(Context.getObjCClassType().getTypePtr());
1980 if (!TypeID->isStr("SEL"))
1982 Context.setObjCSelRedefinitionType(New->getUnderlyingType());
1983 // Install the built-in type for 'SEL', ignoring the current definition.
1984 New->setTypeForDecl(Context.getObjCSelType().getTypePtr());
1987 // Fall through - the typedef name was not a builtin type.
1990 // Verify the old decl was also a type.
1991 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>();
1993 Diag(New->getLocation(), diag::err_redefinition_different_kind)
1994 << New->getDeclName();
1996 NamedDecl *OldD = OldDecls.getRepresentativeDecl();
1997 if (OldD->getLocation().isValid())
1998 Diag(OldD->getLocation(), diag::note_previous_definition);
2000 return New->setInvalidDecl();
2003 // If the old declaration is invalid, just give up here.
2004 if (Old->isInvalidDecl())
2005 return New->setInvalidDecl();
2007 if (auto *OldTD = dyn_cast<TypedefNameDecl>(Old)) {
2008 auto *OldTag = OldTD->getAnonDeclWithTypedefName(/*AnyRedecl*/true);
2009 auto *NewTag = New->getAnonDeclWithTypedefName();
2010 NamedDecl *Hidden = nullptr;
2011 if (getLangOpts().CPlusPlus && OldTag && NewTag &&
2012 OldTag->getCanonicalDecl() != NewTag->getCanonicalDecl() &&
2013 !hasVisibleDefinition(OldTag, &Hidden)) {
2014 // There is a definition of this tag, but it is not visible. Use it
2015 // instead of our tag.
2016 New->setTypeForDecl(OldTD->getTypeForDecl());
2017 if (OldTD->isModed())
2018 New->setModedTypeSourceInfo(OldTD->getTypeSourceInfo(),
2019 OldTD->getUnderlyingType());
2021 New->setTypeSourceInfo(OldTD->getTypeSourceInfo());
2023 // Make the old tag definition visible.
2024 makeMergedDefinitionVisible(Hidden, NewTag->getLocation());
2026 // If this was an unscoped enumeration, yank all of its enumerators
2027 // out of the scope.
2028 if (isa<EnumDecl>(NewTag)) {
2029 Scope *EnumScope = getNonFieldDeclScope(S);
2030 for (auto *D : NewTag->decls()) {
2031 auto *ED = cast<EnumConstantDecl>(D);
2032 assert(EnumScope->isDeclScope(ED));
2033 EnumScope->RemoveDecl(ED);
2034 IdResolver.RemoveDecl(ED);
2035 ED->getLexicalDeclContext()->removeDecl(ED);
2041 // If the typedef types are not identical, reject them in all languages and
2042 // with any extensions enabled.
2043 if (isIncompatibleTypedef(Old, New))
2046 // The types match. Link up the redeclaration chain and merge attributes if
2047 // the old declaration was a typedef.
2048 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) {
2049 New->setPreviousDecl(Typedef);
2050 mergeDeclAttributes(New, Old);
2053 if (getLangOpts().MicrosoftExt)
2056 if (getLangOpts().CPlusPlus) {
2057 // C++ [dcl.typedef]p2:
2058 // In a given non-class scope, a typedef specifier can be used to
2059 // redefine the name of any type declared in that scope to refer
2060 // to the type to which it already refers.
2061 if (!isa<CXXRecordDecl>(CurContext))
2064 // C++0x [dcl.typedef]p4:
2065 // In a given class scope, a typedef specifier can be used to redefine
2066 // any class-name declared in that scope that is not also a typedef-name
2067 // to refer to the type to which it already refers.
2069 // This wording came in via DR424, which was a correction to the
2070 // wording in DR56, which accidentally banned code like:
2073 // typedef struct A { } A;
2076 // in the C++03 standard. We implement the C++0x semantics, which
2077 // allow the above but disallow
2084 // since that was the intent of DR56.
2085 if (!isa<TypedefNameDecl>(Old))
2088 Diag(New->getLocation(), diag::err_redefinition)
2089 << New->getDeclName();
2090 Diag(Old->getLocation(), diag::note_previous_definition);
2091 return New->setInvalidDecl();
2094 // Modules always permit redefinition of typedefs, as does C11.
2095 if (getLangOpts().Modules || getLangOpts().C11)
2098 // If we have a redefinition of a typedef in C, emit a warning. This warning
2099 // is normally mapped to an error, but can be controlled with
2100 // -Wtypedef-redefinition. If either the original or the redefinition is
2101 // in a system header, don't emit this for compatibility with GCC.
2102 if (getDiagnostics().getSuppressSystemWarnings() &&
2103 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) ||
2104 Context.getSourceManager().isInSystemHeader(New->getLocation())))
2107 Diag(New->getLocation(), diag::ext_redefinition_of_typedef)
2108 << New->getDeclName();
2109 Diag(Old->getLocation(), diag::note_previous_definition);
2112 /// DeclhasAttr - returns true if decl Declaration already has the target
2114 static bool DeclHasAttr(const Decl *D, const Attr *A) {
2115 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A);
2116 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A);
2117 for (const auto *i : D->attrs())
2118 if (i->getKind() == A->getKind()) {
2120 if (Ann->getAnnotation() == cast<AnnotateAttr>(i)->getAnnotation())
2124 // FIXME: Don't hardcode this check
2125 if (OA && isa<OwnershipAttr>(i))
2126 return OA->getOwnKind() == cast<OwnershipAttr>(i)->getOwnKind();
2133 static bool isAttributeTargetADefinition(Decl *D) {
2134 if (VarDecl *VD = dyn_cast<VarDecl>(D))
2135 return VD->isThisDeclarationADefinition();
2136 if (TagDecl *TD = dyn_cast<TagDecl>(D))
2137 return TD->isCompleteDefinition() || TD->isBeingDefined();
2141 /// Merge alignment attributes from \p Old to \p New, taking into account the
2142 /// special semantics of C11's _Alignas specifier and C++11's alignas attribute.
2144 /// \return \c true if any attributes were added to \p New.
2145 static bool mergeAlignedAttrs(Sema &S, NamedDecl *New, Decl *Old) {
2146 // Look for alignas attributes on Old, and pick out whichever attribute
2147 // specifies the strictest alignment requirement.
2148 AlignedAttr *OldAlignasAttr = nullptr;
2149 AlignedAttr *OldStrictestAlignAttr = nullptr;
2150 unsigned OldAlign = 0;
2151 for (auto *I : Old->specific_attrs<AlignedAttr>()) {
2152 // FIXME: We have no way of representing inherited dependent alignments
2154 // template<int A, int B> struct alignas(A) X;
2155 // template<int A, int B> struct alignas(B) X {};
2156 // For now, we just ignore any alignas attributes which are not on the
2157 // definition in such a case.
2158 if (I->isAlignmentDependent())
2164 unsigned Align = I->getAlignment(S.Context);
2165 if (Align > OldAlign) {
2167 OldStrictestAlignAttr = I;
2171 // Look for alignas attributes on New.
2172 AlignedAttr *NewAlignasAttr = nullptr;
2173 unsigned NewAlign = 0;
2174 for (auto *I : New->specific_attrs<AlignedAttr>()) {
2175 if (I->isAlignmentDependent())
2181 unsigned Align = I->getAlignment(S.Context);
2182 if (Align > NewAlign)
2186 if (OldAlignasAttr && NewAlignasAttr && OldAlign != NewAlign) {
2187 // Both declarations have 'alignas' attributes. We require them to match.
2188 // C++11 [dcl.align]p6 and C11 6.7.5/7 both come close to saying this, but
2189 // fall short. (If two declarations both have alignas, they must both match
2190 // every definition, and so must match each other if there is a definition.)
2192 // If either declaration only contains 'alignas(0)' specifiers, then it
2193 // specifies the natural alignment for the type.
2194 if (OldAlign == 0 || NewAlign == 0) {
2196 if (ValueDecl *VD = dyn_cast<ValueDecl>(New))
2199 Ty = S.Context.getTagDeclType(cast<TagDecl>(New));
2202 OldAlign = S.Context.getTypeAlign(Ty);
2204 NewAlign = S.Context.getTypeAlign(Ty);
2207 if (OldAlign != NewAlign) {
2208 S.Diag(NewAlignasAttr->getLocation(), diag::err_alignas_mismatch)
2209 << (unsigned)S.Context.toCharUnitsFromBits(OldAlign).getQuantity()
2210 << (unsigned)S.Context.toCharUnitsFromBits(NewAlign).getQuantity();
2211 S.Diag(OldAlignasAttr->getLocation(), diag::note_previous_declaration);
2215 if (OldAlignasAttr && !NewAlignasAttr && isAttributeTargetADefinition(New)) {
2216 // C++11 [dcl.align]p6:
2217 // if any declaration of an entity has an alignment-specifier,
2218 // every defining declaration of that entity shall specify an
2219 // equivalent alignment.
2221 // If the definition of an object does not have an alignment
2222 // specifier, any other declaration of that object shall also
2223 // have no alignment specifier.
2224 S.Diag(New->getLocation(), diag::err_alignas_missing_on_definition)
2226 S.Diag(OldAlignasAttr->getLocation(), diag::note_alignas_on_declaration)
2230 bool AnyAdded = false;
2232 // Ensure we have an attribute representing the strictest alignment.
2233 if (OldAlign > NewAlign) {
2234 AlignedAttr *Clone = OldStrictestAlignAttr->clone(S.Context);
2235 Clone->setInherited(true);
2236 New->addAttr(Clone);
2240 // Ensure we have an alignas attribute if the old declaration had one.
2241 if (OldAlignasAttr && !NewAlignasAttr &&
2242 !(AnyAdded && OldStrictestAlignAttr->isAlignas())) {
2243 AlignedAttr *Clone = OldAlignasAttr->clone(S.Context);
2244 Clone->setInherited(true);
2245 New->addAttr(Clone);
2252 static bool mergeDeclAttribute(Sema &S, NamedDecl *D,
2253 const InheritableAttr *Attr,
2254 Sema::AvailabilityMergeKind AMK) {
2255 // This function copies an attribute Attr from a previous declaration to the
2256 // new declaration D if the new declaration doesn't itself have that attribute
2257 // yet or if that attribute allows duplicates.
2258 // If you're adding a new attribute that requires logic different from
2259 // "use explicit attribute on decl if present, else use attribute from
2260 // previous decl", for example if the attribute needs to be consistent
2261 // between redeclarations, you need to call a custom merge function here.
2262 InheritableAttr *NewAttr = nullptr;
2263 unsigned AttrSpellingListIndex = Attr->getSpellingListIndex();
2264 if (const auto *AA = dyn_cast<AvailabilityAttr>(Attr))
2265 NewAttr = S.mergeAvailabilityAttr(D, AA->getRange(), AA->getPlatform(),
2266 AA->isImplicit(), AA->getIntroduced(),
2267 AA->getDeprecated(),
2268 AA->getObsoleted(), AA->getUnavailable(),
2269 AA->getMessage(), AA->getStrict(),
2270 AA->getReplacement(), AMK,
2271 AttrSpellingListIndex);
2272 else if (const auto *VA = dyn_cast<VisibilityAttr>(Attr))
2273 NewAttr = S.mergeVisibilityAttr(D, VA->getRange(), VA->getVisibility(),
2274 AttrSpellingListIndex);
2275 else if (const auto *VA = dyn_cast<TypeVisibilityAttr>(Attr))
2276 NewAttr = S.mergeTypeVisibilityAttr(D, VA->getRange(), VA->getVisibility(),
2277 AttrSpellingListIndex);
2278 else if (const auto *ImportA = dyn_cast<DLLImportAttr>(Attr))
2279 NewAttr = S.mergeDLLImportAttr(D, ImportA->getRange(),
2280 AttrSpellingListIndex);
2281 else if (const auto *ExportA = dyn_cast<DLLExportAttr>(Attr))
2282 NewAttr = S.mergeDLLExportAttr(D, ExportA->getRange(),
2283 AttrSpellingListIndex);
2284 else if (const auto *FA = dyn_cast<FormatAttr>(Attr))
2285 NewAttr = S.mergeFormatAttr(D, FA->getRange(), FA->getType(),
2286 FA->getFormatIdx(), FA->getFirstArg(),
2287 AttrSpellingListIndex);
2288 else if (const auto *SA = dyn_cast<SectionAttr>(Attr))
2289 NewAttr = S.mergeSectionAttr(D, SA->getRange(), SA->getName(),
2290 AttrSpellingListIndex);
2291 else if (const auto *IA = dyn_cast<MSInheritanceAttr>(Attr))
2292 NewAttr = S.mergeMSInheritanceAttr(D, IA->getRange(), IA->getBestCase(),
2293 AttrSpellingListIndex,
2294 IA->getSemanticSpelling());
2295 else if (const auto *AA = dyn_cast<AlwaysInlineAttr>(Attr))
2296 NewAttr = S.mergeAlwaysInlineAttr(D, AA->getRange(),
2297 &S.Context.Idents.get(AA->getSpelling()),
2298 AttrSpellingListIndex);
2299 else if (S.getLangOpts().CUDA && isa<FunctionDecl>(D) &&
2300 (isa<CUDAHostAttr>(Attr) || isa<CUDADeviceAttr>(Attr) ||
2301 isa<CUDAGlobalAttr>(Attr))) {
2302 // CUDA target attributes are part of function signature for
2303 // overloading purposes and must not be merged.
2305 } else if (const auto *MA = dyn_cast<MinSizeAttr>(Attr))
2306 NewAttr = S.mergeMinSizeAttr(D, MA->getRange(), AttrSpellingListIndex);
2307 else if (const auto *OA = dyn_cast<OptimizeNoneAttr>(Attr))
2308 NewAttr = S.mergeOptimizeNoneAttr(D, OA->getRange(), AttrSpellingListIndex);
2309 else if (const auto *InternalLinkageA = dyn_cast<InternalLinkageAttr>(Attr))
2310 NewAttr = S.mergeInternalLinkageAttr(
2311 D, InternalLinkageA->getRange(),
2312 &S.Context.Idents.get(InternalLinkageA->getSpelling()),
2313 AttrSpellingListIndex);
2314 else if (const auto *CommonA = dyn_cast<CommonAttr>(Attr))
2315 NewAttr = S.mergeCommonAttr(D, CommonA->getRange(),
2316 &S.Context.Idents.get(CommonA->getSpelling()),
2317 AttrSpellingListIndex);
2318 else if (isa<AlignedAttr>(Attr))
2319 // AlignedAttrs are handled separately, because we need to handle all
2320 // such attributes on a declaration at the same time.
2322 else if ((isa<DeprecatedAttr>(Attr) || isa<UnavailableAttr>(Attr)) &&
2323 (AMK == Sema::AMK_Override ||
2324 AMK == Sema::AMK_ProtocolImplementation))
2326 else if (const auto *UA = dyn_cast<UuidAttr>(Attr))
2327 NewAttr = S.mergeUuidAttr(D, UA->getRange(), AttrSpellingListIndex,
2329 else if (Attr->duplicatesAllowed() || !DeclHasAttr(D, Attr))
2330 NewAttr = cast<InheritableAttr>(Attr->clone(S.Context));
2333 NewAttr->setInherited(true);
2334 D->addAttr(NewAttr);
2335 if (isa<MSInheritanceAttr>(NewAttr))
2336 S.Consumer.AssignInheritanceModel(cast<CXXRecordDecl>(D));
2343 static const Decl *getDefinition(const Decl *D) {
2344 if (const TagDecl *TD = dyn_cast<TagDecl>(D))
2345 return TD->getDefinition();
2346 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
2347 const VarDecl *Def = VD->getDefinition();
2350 return VD->getActingDefinition();
2352 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
2353 return FD->getDefinition();
2357 static bool hasAttribute(const Decl *D, attr::Kind Kind) {
2358 for (const auto *Attribute : D->attrs())
2359 if (Attribute->getKind() == Kind)
2364 /// checkNewAttributesAfterDef - If we already have a definition, check that
2365 /// there are no new attributes in this declaration.
2366 static void checkNewAttributesAfterDef(Sema &S, Decl *New, const Decl *Old) {
2367 if (!New->hasAttrs())
2370 const Decl *Def = getDefinition(Old);
2371 if (!Def || Def == New)
2374 AttrVec &NewAttributes = New->getAttrs();
2375 for (unsigned I = 0, E = NewAttributes.size(); I != E;) {
2376 const Attr *NewAttribute = NewAttributes[I];
2378 if (isa<AliasAttr>(NewAttribute) || isa<IFuncAttr>(NewAttribute)) {
2379 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(New)) {
2380 Sema::SkipBodyInfo SkipBody;
2381 S.CheckForFunctionRedefinition(FD, cast<FunctionDecl>(Def), &SkipBody);
2383 // If we're skipping this definition, drop the "alias" attribute.
2384 if (SkipBody.ShouldSkip) {
2385 NewAttributes.erase(NewAttributes.begin() + I);
2390 VarDecl *VD = cast<VarDecl>(New);
2391 unsigned Diag = cast<VarDecl>(Def)->isThisDeclarationADefinition() ==
2392 VarDecl::TentativeDefinition
2393 ? diag::err_alias_after_tentative
2394 : diag::err_redefinition;
2395 S.Diag(VD->getLocation(), Diag) << VD->getDeclName();
2396 S.Diag(Def->getLocation(), diag::note_previous_definition);
2397 VD->setInvalidDecl();
2403 if (const VarDecl *VD = dyn_cast<VarDecl>(Def)) {
2404 // Tentative definitions are only interesting for the alias check above.
2405 if (VD->isThisDeclarationADefinition() != VarDecl::Definition) {
2411 if (hasAttribute(Def, NewAttribute->getKind())) {
2413 continue; // regular attr merging will take care of validating this.
2416 if (isa<C11NoReturnAttr>(NewAttribute)) {
2417 // C's _Noreturn is allowed to be added to a function after it is defined.
2420 } else if (const AlignedAttr *AA = dyn_cast<AlignedAttr>(NewAttribute)) {
2421 if (AA->isAlignas()) {
2422 // C++11 [dcl.align]p6:
2423 // if any declaration of an entity has an alignment-specifier,
2424 // every defining declaration of that entity shall specify an
2425 // equivalent alignment.
2427 // If the definition of an object does not have an alignment
2428 // specifier, any other declaration of that object shall also
2429 // have no alignment specifier.
2430 S.Diag(Def->getLocation(), diag::err_alignas_missing_on_definition)
2432 S.Diag(NewAttribute->getLocation(), diag::note_alignas_on_declaration)
2434 NewAttributes.erase(NewAttributes.begin() + I);
2440 S.Diag(NewAttribute->getLocation(),
2441 diag::warn_attribute_precede_definition);
2442 S.Diag(Def->getLocation(), diag::note_previous_definition);
2443 NewAttributes.erase(NewAttributes.begin() + I);
2448 /// mergeDeclAttributes - Copy attributes from the Old decl to the New one.
2449 void Sema::mergeDeclAttributes(NamedDecl *New, Decl *Old,
2450 AvailabilityMergeKind AMK) {
2451 if (UsedAttr *OldAttr = Old->getMostRecentDecl()->getAttr<UsedAttr>()) {
2452 UsedAttr *NewAttr = OldAttr->clone(Context);
2453 NewAttr->setInherited(true);
2454 New->addAttr(NewAttr);
2457 if (!Old->hasAttrs() && !New->hasAttrs())
2460 // Attributes declared post-definition are currently ignored.
2461 checkNewAttributesAfterDef(*this, New, Old);
2463 if (AsmLabelAttr *NewA = New->getAttr<AsmLabelAttr>()) {
2464 if (AsmLabelAttr *OldA = Old->getAttr<AsmLabelAttr>()) {
2465 if (OldA->getLabel() != NewA->getLabel()) {
2466 // This redeclaration changes __asm__ label.
2467 Diag(New->getLocation(), diag::err_different_asm_label);
2468 Diag(OldA->getLocation(), diag::note_previous_declaration);
2470 } else if (Old->isUsed()) {
2471 // This redeclaration adds an __asm__ label to a declaration that has
2472 // already been ODR-used.
2473 Diag(New->getLocation(), diag::err_late_asm_label_name)
2474 << isa<FunctionDecl>(Old) << New->getAttr<AsmLabelAttr>()->getRange();
2478 // Re-declaration cannot add abi_tag's.
2479 if (const auto *NewAbiTagAttr = New->getAttr<AbiTagAttr>()) {
2480 if (const auto *OldAbiTagAttr = Old->getAttr<AbiTagAttr>()) {
2481 for (const auto &NewTag : NewAbiTagAttr->tags()) {
2482 if (std::find(OldAbiTagAttr->tags_begin(), OldAbiTagAttr->tags_end(),
2483 NewTag) == OldAbiTagAttr->tags_end()) {
2484 Diag(NewAbiTagAttr->getLocation(),
2485 diag::err_new_abi_tag_on_redeclaration)
2487 Diag(OldAbiTagAttr->getLocation(), diag::note_previous_declaration);
2491 Diag(NewAbiTagAttr->getLocation(), diag::err_abi_tag_on_redeclaration);
2492 Diag(Old->getLocation(), diag::note_previous_declaration);
2496 if (!Old->hasAttrs())
2499 bool foundAny = New->hasAttrs();
2501 // Ensure that any moving of objects within the allocated map is done before
2503 if (!foundAny) New->setAttrs(AttrVec());
2505 for (auto *I : Old->specific_attrs<InheritableAttr>()) {
2506 // Ignore deprecated/unavailable/availability attributes if requested.
2507 AvailabilityMergeKind LocalAMK = AMK_None;
2508 if (isa<DeprecatedAttr>(I) ||
2509 isa<UnavailableAttr>(I) ||
2510 isa<AvailabilityAttr>(I)) {
2515 case AMK_Redeclaration:
2517 case AMK_ProtocolImplementation:
2524 if (isa<UsedAttr>(I))
2527 if (mergeDeclAttribute(*this, New, I, LocalAMK))
2531 if (mergeAlignedAttrs(*this, New, Old))
2534 if (!foundAny) New->dropAttrs();
2537 /// mergeParamDeclAttributes - Copy attributes from the old parameter
2539 static void mergeParamDeclAttributes(ParmVarDecl *newDecl,
2540 const ParmVarDecl *oldDecl,
2542 // C++11 [dcl.attr.depend]p2:
2543 // The first declaration of a function shall specify the
2544 // carries_dependency attribute for its declarator-id if any declaration
2545 // of the function specifies the carries_dependency attribute.
2546 const CarriesDependencyAttr *CDA = newDecl->getAttr<CarriesDependencyAttr>();
2547 if (CDA && !oldDecl->hasAttr<CarriesDependencyAttr>()) {
2548 S.Diag(CDA->getLocation(),
2549 diag::err_carries_dependency_missing_on_first_decl) << 1/*Param*/;
2550 // Find the first declaration of the parameter.
2551 // FIXME: Should we build redeclaration chains for function parameters?
2552 const FunctionDecl *FirstFD =
2553 cast<FunctionDecl>(oldDecl->getDeclContext())->getFirstDecl();
2554 const ParmVarDecl *FirstVD =
2555 FirstFD->getParamDecl(oldDecl->getFunctionScopeIndex());
2556 S.Diag(FirstVD->getLocation(),
2557 diag::note_carries_dependency_missing_first_decl) << 1/*Param*/;
2560 if (!oldDecl->hasAttrs())
2563 bool foundAny = newDecl->hasAttrs();
2565 // Ensure that any moving of objects within the allocated map is
2566 // done before we process them.
2567 if (!foundAny) newDecl->setAttrs(AttrVec());
2569 for (const auto *I : oldDecl->specific_attrs<InheritableParamAttr>()) {
2570 if (!DeclHasAttr(newDecl, I)) {
2571 InheritableAttr *newAttr =
2572 cast<InheritableParamAttr>(I->clone(S.Context));
2573 newAttr->setInherited(true);
2574 newDecl->addAttr(newAttr);
2579 if (!foundAny) newDecl->dropAttrs();
2582 static void mergeParamDeclTypes(ParmVarDecl *NewParam,
2583 const ParmVarDecl *OldParam,
2585 if (auto Oldnullability = OldParam->getType()->getNullability(S.Context)) {
2586 if (auto Newnullability = NewParam->getType()->getNullability(S.Context)) {
2587 if (*Oldnullability != *Newnullability) {
2588 S.Diag(NewParam->getLocation(), diag::warn_mismatched_nullability_attr)
2589 << DiagNullabilityKind(
2591 ((NewParam->getObjCDeclQualifier() & Decl::OBJC_TQ_CSNullability)
2593 << DiagNullabilityKind(
2595 ((OldParam->getObjCDeclQualifier() & Decl::OBJC_TQ_CSNullability)
2597 S.Diag(OldParam->getLocation(), diag::note_previous_declaration);
2600 QualType NewT = NewParam->getType();
2601 NewT = S.Context.getAttributedType(
2602 AttributedType::getNullabilityAttrKind(*Oldnullability),
2604 NewParam->setType(NewT);
2611 /// Used in MergeFunctionDecl to keep track of function parameters in
2613 struct GNUCompatibleParamWarning {
2614 ParmVarDecl *OldParm;
2615 ParmVarDecl *NewParm;
2616 QualType PromotedType;
2619 } // end anonymous namespace
2621 /// getSpecialMember - get the special member enum for a method.
2622 Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) {
2623 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) {
2624 if (Ctor->isDefaultConstructor())
2625 return Sema::CXXDefaultConstructor;
2627 if (Ctor->isCopyConstructor())
2628 return Sema::CXXCopyConstructor;
2630 if (Ctor->isMoveConstructor())
2631 return Sema::CXXMoveConstructor;
2632 } else if (isa<CXXDestructorDecl>(MD)) {
2633 return Sema::CXXDestructor;
2634 } else if (MD->isCopyAssignmentOperator()) {
2635 return Sema::CXXCopyAssignment;
2636 } else if (MD->isMoveAssignmentOperator()) {
2637 return Sema::CXXMoveAssignment;
2640 return Sema::CXXInvalid;
2643 // Determine whether the previous declaration was a definition, implicit
2644 // declaration, or a declaration.
2645 template <typename T>
2646 static std::pair<diag::kind, SourceLocation>
2647 getNoteDiagForInvalidRedeclaration(const T *Old, const T *New) {
2648 diag::kind PrevDiag;
2649 SourceLocation OldLocation = Old->getLocation();
2650 if (Old->isThisDeclarationADefinition())
2651 PrevDiag = diag::note_previous_definition;
2652 else if (Old->isImplicit()) {
2653 PrevDiag = diag::note_previous_implicit_declaration;
2654 if (OldLocation.isInvalid())
2655 OldLocation = New->getLocation();
2657 PrevDiag = diag::note_previous_declaration;
2658 return std::make_pair(PrevDiag, OldLocation);
2661 /// canRedefineFunction - checks if a function can be redefined. Currently,
2662 /// only extern inline functions can be redefined, and even then only in
2664 static bool canRedefineFunction(const FunctionDecl *FD,
2665 const LangOptions& LangOpts) {
2666 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) &&
2667 !LangOpts.CPlusPlus &&
2668 FD->isInlineSpecified() &&
2669 FD->getStorageClass() == SC_Extern);
2672 const AttributedType *Sema::getCallingConvAttributedType(QualType T) const {
2673 const AttributedType *AT = T->getAs<AttributedType>();
2674 while (AT && !AT->isCallingConv())
2675 AT = AT->getModifiedType()->getAs<AttributedType>();
2679 template <typename T>
2680 static bool haveIncompatibleLanguageLinkages(const T *Old, const T *New) {
2681 const DeclContext *DC = Old->getDeclContext();
2685 LanguageLinkage OldLinkage = Old->getLanguageLinkage();
2686 if (OldLinkage == CXXLanguageLinkage && New->isInExternCContext())
2688 if (OldLinkage == CLanguageLinkage && New->isInExternCXXContext())
2693 template<typename T> static bool isExternC(T *D) { return D->isExternC(); }
2694 static bool isExternC(VarTemplateDecl *) { return false; }
2696 /// \brief Check whether a redeclaration of an entity introduced by a
2697 /// using-declaration is valid, given that we know it's not an overload
2698 /// (nor a hidden tag declaration).
2699 template<typename ExpectedDecl>
2700 static bool checkUsingShadowRedecl(Sema &S, UsingShadowDecl *OldS,
2701 ExpectedDecl *New) {
2702 // C++11 [basic.scope.declarative]p4:
2703 // Given a set of declarations in a single declarative region, each of
2704 // which specifies the same unqualified name,
2705 // -- they shall all refer to the same entity, or all refer to functions
2706 // and function templates; or
2707 // -- exactly one declaration shall declare a class name or enumeration
2708 // name that is not a typedef name and the other declarations shall all
2709 // refer to the same variable or enumerator, or all refer to functions
2710 // and function templates; in this case the class name or enumeration
2711 // name is hidden (3.3.10).
2713 // C++11 [namespace.udecl]p14:
2714 // If a function declaration in namespace scope or block scope has the
2715 // same name and the same parameter-type-list as a function introduced
2716 // by a using-declaration, and the declarations do not declare the same
2717 // function, the program is ill-formed.
2719 auto *Old = dyn_cast<ExpectedDecl>(OldS->getTargetDecl());
2721 !Old->getDeclContext()->getRedeclContext()->Equals(
2722 New->getDeclContext()->getRedeclContext()) &&
2723 !(isExternC(Old) && isExternC(New)))
2727 S.Diag(New->getLocation(), diag::err_using_decl_conflict_reverse);
2728 S.Diag(OldS->getTargetDecl()->getLocation(), diag::note_using_decl_target);
2729 S.Diag(OldS->getUsingDecl()->getLocation(), diag::note_using_decl) << 0;
2735 static bool hasIdenticalPassObjectSizeAttrs(const FunctionDecl *A,
2736 const FunctionDecl *B) {
2737 assert(A->getNumParams() == B->getNumParams());
2739 auto AttrEq = [](const ParmVarDecl *A, const ParmVarDecl *B) {
2740 const auto *AttrA = A->getAttr<PassObjectSizeAttr>();
2741 const auto *AttrB = B->getAttr<PassObjectSizeAttr>();
2744 return AttrA && AttrB && AttrA->getType() == AttrB->getType();
2747 return std::equal(A->param_begin(), A->param_end(), B->param_begin(), AttrEq);
2750 /// MergeFunctionDecl - We just parsed a function 'New' from
2751 /// declarator D which has the same name and scope as a previous
2752 /// declaration 'Old'. Figure out how to resolve this situation,
2753 /// merging decls or emitting diagnostics as appropriate.
2755 /// In C++, New and Old must be declarations that are not
2756 /// overloaded. Use IsOverload to determine whether New and Old are
2757 /// overloaded, and to select the Old declaration that New should be
2760 /// Returns true if there was an error, false otherwise.
2761 bool Sema::MergeFunctionDecl(FunctionDecl *New, NamedDecl *&OldD,
2762 Scope *S, bool MergeTypeWithOld) {
2763 // Verify the old decl was also a function.
2764 FunctionDecl *Old = OldD->getAsFunction();
2766 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) {
2767 if (New->getFriendObjectKind()) {
2768 Diag(New->getLocation(), diag::err_using_decl_friend);
2769 Diag(Shadow->getTargetDecl()->getLocation(),
2770 diag::note_using_decl_target);
2771 Diag(Shadow->getUsingDecl()->getLocation(),
2772 diag::note_using_decl) << 0;
2776 // Check whether the two declarations might declare the same function.
2777 if (checkUsingShadowRedecl<FunctionDecl>(*this, Shadow, New))
2779 OldD = Old = cast<FunctionDecl>(Shadow->getTargetDecl());
2781 Diag(New->getLocation(), diag::err_redefinition_different_kind)
2782 << New->getDeclName();
2783 Diag(OldD->getLocation(), diag::note_previous_definition);
2788 // If the old declaration is invalid, just give up here.
2789 if (Old->isInvalidDecl())
2792 diag::kind PrevDiag;
2793 SourceLocation OldLocation;
2794 std::tie(PrevDiag, OldLocation) =
2795 getNoteDiagForInvalidRedeclaration(Old, New);
2797 // Don't complain about this if we're in GNU89 mode and the old function
2798 // is an extern inline function.
2799 // Don't complain about specializations. They are not supposed to have
2801 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) &&
2802 New->getStorageClass() == SC_Static &&
2803 Old->hasExternalFormalLinkage() &&
2804 !New->getTemplateSpecializationInfo() &&
2805 !canRedefineFunction(Old, getLangOpts())) {
2806 if (getLangOpts().MicrosoftExt) {
2807 Diag(New->getLocation(), diag::ext_static_non_static) << New;
2808 Diag(OldLocation, PrevDiag);
2810 Diag(New->getLocation(), diag::err_static_non_static) << New;
2811 Diag(OldLocation, PrevDiag);
2816 if (New->hasAttr<InternalLinkageAttr>() &&
2817 !Old->hasAttr<InternalLinkageAttr>()) {
2818 Diag(New->getLocation(), diag::err_internal_linkage_redeclaration)
2819 << New->getDeclName();
2820 Diag(Old->getLocation(), diag::note_previous_definition);
2821 New->dropAttr<InternalLinkageAttr>();
2824 // If a function is first declared with a calling convention, but is later
2825 // declared or defined without one, all following decls assume the calling
2826 // convention of the first.
2828 // It's OK if a function is first declared without a calling convention,
2829 // but is later declared or defined with the default calling convention.
2831 // To test if either decl has an explicit calling convention, we look for
2832 // AttributedType sugar nodes on the type as written. If they are missing or
2833 // were canonicalized away, we assume the calling convention was implicit.
2835 // Note also that we DO NOT return at this point, because we still have
2836 // other tests to run.
2837 QualType OldQType = Context.getCanonicalType(Old->getType());
2838 QualType NewQType = Context.getCanonicalType(New->getType());
2839 const FunctionType *OldType = cast<FunctionType>(OldQType);
2840 const FunctionType *NewType = cast<FunctionType>(NewQType);
2841 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo();
2842 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo();
2843 bool RequiresAdjustment = false;
2845 if (OldTypeInfo.getCC() != NewTypeInfo.getCC()) {
2846 FunctionDecl *First = Old->getFirstDecl();
2847 const FunctionType *FT =
2848 First->getType().getCanonicalType()->castAs<FunctionType>();
2849 FunctionType::ExtInfo FI = FT->getExtInfo();
2850 bool NewCCExplicit = getCallingConvAttributedType(New->getType());
2851 if (!NewCCExplicit) {
2852 // Inherit the CC from the previous declaration if it was specified
2853 // there but not here.
2854 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC());
2855 RequiresAdjustment = true;
2857 // Calling conventions aren't compatible, so complain.
2858 bool FirstCCExplicit = getCallingConvAttributedType(First->getType());
2859 Diag(New->getLocation(), diag::err_cconv_change)
2860 << FunctionType::getNameForCallConv(NewTypeInfo.getCC())
2862 << (!FirstCCExplicit ? "" :
2863 FunctionType::getNameForCallConv(FI.getCC()));
2865 // Put the note on the first decl, since it is the one that matters.
2866 Diag(First->getLocation(), diag::note_previous_declaration);
2871 // FIXME: diagnose the other way around?
2872 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) {
2873 NewTypeInfo = NewTypeInfo.withNoReturn(true);
2874 RequiresAdjustment = true;
2877 // Merge regparm attribute.
2878 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() ||
2879 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) {
2880 if (NewTypeInfo.getHasRegParm()) {
2881 Diag(New->getLocation(), diag::err_regparm_mismatch)
2882 << NewType->getRegParmType()
2883 << OldType->getRegParmType();
2884 Diag(OldLocation, diag::note_previous_declaration);
2888 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm());
2889 RequiresAdjustment = true;
2892 // Merge ns_returns_retained attribute.
2893 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) {
2894 if (NewTypeInfo.getProducesResult()) {
2895 Diag(New->getLocation(), diag::err_returns_retained_mismatch);
2896 Diag(OldLocation, diag::note_previous_declaration);
2900 NewTypeInfo = NewTypeInfo.withProducesResult(true);
2901 RequiresAdjustment = true;
2904 if (RequiresAdjustment) {
2905 const FunctionType *AdjustedType = New->getType()->getAs<FunctionType>();
2906 AdjustedType = Context.adjustFunctionType(AdjustedType, NewTypeInfo);
2907 New->setType(QualType(AdjustedType, 0));
2908 NewQType = Context.getCanonicalType(New->getType());
2909 NewType = cast<FunctionType>(NewQType);
2912 // If this redeclaration makes the function inline, we may need to add it to
2913 // UndefinedButUsed.
2914 if (!Old->isInlined() && New->isInlined() &&
2915 !New->hasAttr<GNUInlineAttr>() &&
2916 !getLangOpts().GNUInline &&
2917 Old->isUsed(false) &&
2918 !Old->isDefined() && !New->isThisDeclarationADefinition())
2919 UndefinedButUsed.insert(std::make_pair(Old->getCanonicalDecl(),
2922 // If this redeclaration makes it newly gnu_inline, we don't want to warn
2924 if (New->hasAttr<GNUInlineAttr>() &&
2925 Old->isInlined() && !Old->hasAttr<GNUInlineAttr>()) {
2926 UndefinedButUsed.erase(Old->getCanonicalDecl());
2929 // If pass_object_size params don't match up perfectly, this isn't a valid
2931 if (Old->getNumParams() > 0 && Old->getNumParams() == New->getNumParams() &&
2932 !hasIdenticalPassObjectSizeAttrs(Old, New)) {
2933 Diag(New->getLocation(), diag::err_different_pass_object_size_params)
2934 << New->getDeclName();
2935 Diag(OldLocation, PrevDiag) << Old << Old->getType();
2939 if (getLangOpts().CPlusPlus) {
2940 // C++1z [over.load]p2
2941 // Certain function declarations cannot be overloaded:
2942 // -- Function declarations that differ only in the return type,
2943 // the exception specification, or both cannot be overloaded.
2945 // Check the exception specifications match. This may recompute the type of
2946 // both Old and New if it resolved exception specifications, so grab the
2947 // types again after this. Because this updates the type, we do this before
2948 // any of the other checks below, which may update the "de facto" NewQType
2949 // but do not necessarily update the type of New.
2950 if (CheckEquivalentExceptionSpec(Old, New))
2952 OldQType = Context.getCanonicalType(Old->getType());
2953 NewQType = Context.getCanonicalType(New->getType());
2955 // Go back to the type source info to compare the declared return types,
2956 // per C++1y [dcl.type.auto]p13:
2957 // Redeclarations or specializations of a function or function template
2958 // with a declared return type that uses a placeholder type shall also
2959 // use that placeholder, not a deduced type.
2960 QualType OldDeclaredReturnType =
2961 (Old->getTypeSourceInfo()
2962 ? Old->getTypeSourceInfo()->getType()->castAs<FunctionType>()
2963 : OldType)->getReturnType();
2964 QualType NewDeclaredReturnType =
2965 (New->getTypeSourceInfo()
2966 ? New->getTypeSourceInfo()->getType()->castAs<FunctionType>()
2967 : NewType)->getReturnType();
2968 if (!Context.hasSameType(OldDeclaredReturnType, NewDeclaredReturnType) &&
2969 !((NewQType->isDependentType() || OldQType->isDependentType()) &&
2970 New->isLocalExternDecl())) {
2972 if (NewDeclaredReturnType->isObjCObjectPointerType() &&
2973 OldDeclaredReturnType->isObjCObjectPointerType())
2974 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType);
2975 if (ResQT.isNull()) {
2976 if (New->isCXXClassMember() && New->isOutOfLine())
2977 Diag(New->getLocation(), diag::err_member_def_does_not_match_ret_type)
2978 << New << New->getReturnTypeSourceRange();
2980 Diag(New->getLocation(), diag::err_ovl_diff_return_type)
2981 << New->getReturnTypeSourceRange();
2982 Diag(OldLocation, PrevDiag) << Old << Old->getType()
2983 << Old->getReturnTypeSourceRange();
2990 QualType OldReturnType = OldType->getReturnType();
2991 QualType NewReturnType = cast<FunctionType>(NewQType)->getReturnType();
2992 if (OldReturnType != NewReturnType) {
2993 // If this function has a deduced return type and has already been
2994 // defined, copy the deduced value from the old declaration.
2995 AutoType *OldAT = Old->getReturnType()->getContainedAutoType();
2996 if (OldAT && OldAT->isDeduced()) {
2998 SubstAutoType(New->getType(),
2999 OldAT->isDependentType() ? Context.DependentTy
3000 : OldAT->getDeducedType()));
3001 NewQType = Context.getCanonicalType(
3002 SubstAutoType(NewQType,
3003 OldAT->isDependentType() ? Context.DependentTy
3004 : OldAT->getDeducedType()));
3008 const CXXMethodDecl *OldMethod = dyn_cast<CXXMethodDecl>(Old);
3009 CXXMethodDecl *NewMethod = dyn_cast<CXXMethodDecl>(New);
3010 if (OldMethod && NewMethod) {
3011 // Preserve triviality.
3012 NewMethod->setTrivial(OldMethod->isTrivial());
3014 // MSVC allows explicit template specialization at class scope:
3015 // 2 CXXMethodDecls referring to the same function will be injected.
3016 // We don't want a redeclaration error.
3017 bool IsClassScopeExplicitSpecialization =
3018 OldMethod->isFunctionTemplateSpecialization() &&
3019 NewMethod->isFunctionTemplateSpecialization();
3020 bool isFriend = NewMethod->getFriendObjectKind();
3022 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() &&
3023 !IsClassScopeExplicitSpecialization) {
3024 // -- Member function declarations with the same name and the
3025 // same parameter types cannot be overloaded if any of them
3026 // is a static member function declaration.
3027 if (OldMethod->isStatic() != NewMethod->isStatic()) {
3028 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member);
3029 Diag(OldLocation, PrevDiag) << Old << Old->getType();
3033 // C++ [class.mem]p1:
3034 // [...] A member shall not be declared twice in the
3035 // member-specification, except that a nested class or member
3036 // class template can be declared and then later defined.
3037 if (ActiveTemplateInstantiations.empty()) {
3039 if (isa<CXXConstructorDecl>(OldMethod))
3040 NewDiag = diag::err_constructor_redeclared;
3041 else if (isa<CXXDestructorDecl>(NewMethod))
3042 NewDiag = diag::err_destructor_redeclared;
3043 else if (isa<CXXConversionDecl>(NewMethod))
3044 NewDiag = diag::err_conv_function_redeclared;
3046 NewDiag = diag::err_member_redeclared;
3048 Diag(New->getLocation(), NewDiag);
3050 Diag(New->getLocation(), diag::err_member_redeclared_in_instantiation)
3051 << New << New->getType();
3053 Diag(OldLocation, PrevDiag) << Old << Old->getType();
3056 // Complain if this is an explicit declaration of a special
3057 // member that was initially declared implicitly.
3059 // As an exception, it's okay to befriend such methods in order
3060 // to permit the implicit constructor/destructor/operator calls.
3061 } else if (OldMethod->isImplicit()) {
3063 NewMethod->setImplicit();
3065 Diag(NewMethod->getLocation(),
3066 diag::err_definition_of_implicitly_declared_member)
3067 << New << getSpecialMember(OldMethod);
3070 } else if (OldMethod->getFirstDecl()->isExplicitlyDefaulted() && !isFriend) {
3071 Diag(NewMethod->getLocation(),
3072 diag::err_definition_of_explicitly_defaulted_member)
3073 << getSpecialMember(OldMethod);
3078 // C++11 [dcl.attr.noreturn]p1:
3079 // The first declaration of a function shall specify the noreturn
3080 // attribute if any declaration of that function specifies the noreturn
3082 const CXX11NoReturnAttr *NRA = New->getAttr<CXX11NoReturnAttr>();
3083 if (NRA && !Old->hasAttr<CXX11NoReturnAttr>()) {
3084 Diag(NRA->getLocation(), diag::err_noreturn_missing_on_first_decl);
3085 Diag(Old->getFirstDecl()->getLocation(),
3086 diag::note_noreturn_missing_first_decl);
3089 // C++11 [dcl.attr.depend]p2:
3090 // The first declaration of a function shall specify the
3091 // carries_dependency attribute for its declarator-id if any declaration
3092 // of the function specifies the carries_dependency attribute.
3093 const CarriesDependencyAttr *CDA = New->getAttr<CarriesDependencyAttr>();
3094 if (CDA && !Old->hasAttr<CarriesDependencyAttr>()) {
3095 Diag(CDA->getLocation(),
3096 diag::err_carries_dependency_missing_on_first_decl) << 0/*Function*/;
3097 Diag(Old->getFirstDecl()->getLocation(),
3098 diag::note_carries_dependency_missing_first_decl) << 0/*Function*/;
3102 // All declarations for a function shall agree exactly in both the
3103 // return type and the parameter-type-list.
3104 // We also want to respect all the extended bits except noreturn.
3106 // noreturn should now match unless the old type info didn't have it.
3107 QualType OldQTypeForComparison = OldQType;
3108 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) {
3109 auto *OldType = OldQType->castAs<FunctionProtoType>();
3110 const FunctionType *OldTypeForComparison
3111 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true));
3112 OldQTypeForComparison = QualType(OldTypeForComparison, 0);
3113 assert(OldQTypeForComparison.isCanonical());
3116 if (haveIncompatibleLanguageLinkages(Old, New)) {
3117 // As a special case, retain the language linkage from previous
3118 // declarations of a friend function as an extension.
3120 // This liberal interpretation of C++ [class.friend]p3 matches GCC/MSVC
3121 // and is useful because there's otherwise no way to specify language
3122 // linkage within class scope.
3124 // Check cautiously as the friend object kind isn't yet complete.
3125 if (New->getFriendObjectKind() != Decl::FOK_None) {
3126 Diag(New->getLocation(), diag::ext_retained_language_linkage) << New;
3127 Diag(OldLocation, PrevDiag);
3129 Diag(New->getLocation(), diag::err_different_language_linkage) << New;
3130 Diag(OldLocation, PrevDiag);
3135 if (OldQTypeForComparison == NewQType)
3136 return MergeCompatibleFunctionDecls(New, Old, S, MergeTypeWithOld);
3138 if ((NewQType->isDependentType() || OldQType->isDependentType()) &&
3139 New->isLocalExternDecl()) {
3140 // It's OK if we couldn't merge types for a local function declaraton
3141 // if either the old or new type is dependent. We'll merge the types
3142 // when we instantiate the function.
3146 // Fall through for conflicting redeclarations and redefinitions.
3149 // C: Function types need to be compatible, not identical. This handles
3150 // duplicate function decls like "void f(int); void f(enum X);" properly.
3151 if (!getLangOpts().CPlusPlus &&
3152 Context.typesAreCompatible(OldQType, NewQType)) {
3153 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>();
3154 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>();
3155 const FunctionProtoType *OldProto = nullptr;
3156 if (MergeTypeWithOld && isa<FunctionNoProtoType>(NewFuncType) &&
3157 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) {
3158 // The old declaration provided a function prototype, but the
3159 // new declaration does not. Merge in the prototype.
3160 assert(!OldProto->hasExceptionSpec() && "Exception spec in C");
3161 SmallVector<QualType, 16> ParamTypes(OldProto->param_types());
3163 Context.getFunctionType(NewFuncType->getReturnType(), ParamTypes,
3164 OldProto->getExtProtoInfo());
3165 New->setType(NewQType);
3166 New->setHasInheritedPrototype();
3168 // Synthesize parameters with the same types.
3169 SmallVector<ParmVarDecl*, 16> Params;
3170 for (const auto &ParamType : OldProto->param_types()) {
3171 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, SourceLocation(),
3172 SourceLocation(), nullptr,
3173 ParamType, /*TInfo=*/nullptr,
3175 Param->setScopeInfo(0, Params.size());
3176 Param->setImplicit();
3177 Params.push_back(Param);
3180 New->setParams(Params);
3183 return MergeCompatibleFunctionDecls(New, Old, S, MergeTypeWithOld);
3186 // GNU C permits a K&R definition to follow a prototype declaration
3187 // if the declared types of the parameters in the K&R definition
3188 // match the types in the prototype declaration, even when the
3189 // promoted types of the parameters from the K&R definition differ
3190 // from the types in the prototype. GCC then keeps the types from
3193 // If a variadic prototype is followed by a non-variadic K&R definition,
3194 // the K&R definition becomes variadic. This is sort of an edge case, but
3195 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and
3197 if (!getLangOpts().CPlusPlus &&
3198 Old->hasPrototype() && !New->hasPrototype() &&
3199 New->getType()->getAs<FunctionProtoType>() &&
3200 Old->getNumParams() == New->getNumParams()) {
3201 SmallVector<QualType, 16> ArgTypes;
3202 SmallVector<GNUCompatibleParamWarning, 16> Warnings;
3203 const FunctionProtoType *OldProto
3204 = Old->getType()->getAs<FunctionProtoType>();
3205 const FunctionProtoType *NewProto
3206 = New->getType()->getAs<FunctionProtoType>();
3208 // Determine whether this is the GNU C extension.
3209 QualType MergedReturn = Context.mergeTypes(OldProto->getReturnType(),
3210 NewProto->getReturnType());
3211 bool LooseCompatible = !MergedReturn.isNull();
3212 for (unsigned Idx = 0, End = Old->getNumParams();
3213 LooseCompatible && Idx != End; ++Idx) {
3214 ParmVarDecl *OldParm = Old->getParamDecl(Idx);
3215 ParmVarDecl *NewParm = New->getParamDecl(Idx);
3216 if (Context.typesAreCompatible(OldParm->getType(),
3217 NewProto->getParamType(Idx))) {
3218 ArgTypes.push_back(NewParm->getType());
3219 } else if (Context.typesAreCompatible(OldParm->getType(),
3221 /*CompareUnqualified=*/true)) {
3222 GNUCompatibleParamWarning Warn = { OldParm, NewParm,
3223 NewProto->getParamType(Idx) };
3224 Warnings.push_back(Warn);
3225 ArgTypes.push_back(NewParm->getType());
3227 LooseCompatible = false;
3230 if (LooseCompatible) {
3231 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) {
3232 Diag(Warnings[Warn].NewParm->getLocation(),
3233 diag::ext_param_promoted_not_compatible_with_prototype)
3234 << Warnings[Warn].PromotedType
3235 << Warnings[Warn].OldParm->getType();
3236 if (Warnings[Warn].OldParm->getLocation().isValid())
3237 Diag(Warnings[Warn].OldParm->getLocation(),
3238 diag::note_previous_declaration);
3241 if (MergeTypeWithOld)
3242 New->setType(Context.getFunctionType(MergedReturn, ArgTypes,
3243 OldProto->getExtProtoInfo()));
3244 return MergeCompatibleFunctionDecls(New, Old, S, MergeTypeWithOld);
3247 // Fall through to diagnose conflicting types.
3250 // A function that has already been declared has been redeclared or
3251 // defined with a different type; show an appropriate diagnostic.
3253 // If the previous declaration was an implicitly-generated builtin
3254 // declaration, then at the very least we should use a specialized note.
3256 if (Old->isImplicit() && (BuiltinID = Old->getBuiltinID())) {
3257 // If it's actually a library-defined builtin function like 'malloc'
3258 // or 'printf', just warn about the incompatible redeclaration.
3259 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) {
3260 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New;
3261 Diag(OldLocation, diag::note_previous_builtin_declaration)
3262 << Old << Old->getType();
3264 // If this is a global redeclaration, just forget hereafter
3265 // about the "builtin-ness" of the function.
3267 // Doing this for local extern declarations is problematic. If
3268 // the builtin declaration remains visible, a second invalid
3269 // local declaration will produce a hard error; if it doesn't
3270 // remain visible, a single bogus local redeclaration (which is
3271 // actually only a warning) could break all the downstream code.
3272 if (!New->getLexicalDeclContext()->isFunctionOrMethod())
3273 New->getIdentifier()->revertBuiltin();
3278 PrevDiag = diag::note_previous_builtin_declaration;
3281 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName();
3282 Diag(OldLocation, PrevDiag) << Old << Old->getType();
3286 /// \brief Completes the merge of two function declarations that are
3287 /// known to be compatible.
3289 /// This routine handles the merging of attributes and other
3290 /// properties of function declarations from the old declaration to
3291 /// the new declaration, once we know that New is in fact a
3292 /// redeclaration of Old.
3295 bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old,
3296 Scope *S, bool MergeTypeWithOld) {
3297 // Merge the attributes
3298 mergeDeclAttributes(New, Old);
3300 // Merge "pure" flag.
3304 // Merge "used" flag.
3305 if (Old->getMostRecentDecl()->isUsed(false))
3308 // Merge attributes from the parameters. These can mismatch with K&R
3310 if (New->getNumParams() == Old->getNumParams())
3311 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) {
3312 ParmVarDecl *NewParam = New->getParamDecl(i);
3313 ParmVarDecl *OldParam = Old->getParamDecl(i);
3314 mergeParamDeclAttributes(NewParam, OldParam, *this);
3315 mergeParamDeclTypes(NewParam, OldParam, *this);
3318 if (getLangOpts().CPlusPlus)
3319 return MergeCXXFunctionDecl(New, Old, S);
3321 // Merge the function types so the we get the composite types for the return
3322 // and argument types. Per C11 6.2.7/4, only update the type if the old decl
3324 QualType Merged = Context.mergeTypes(Old->getType(), New->getType());
3325 if (!Merged.isNull() && MergeTypeWithOld)
3326 New->setType(Merged);
3331 void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod,
3332 ObjCMethodDecl *oldMethod) {
3333 // Merge the attributes, including deprecated/unavailable
3334 AvailabilityMergeKind MergeKind =
3335 isa<ObjCProtocolDecl>(oldMethod->getDeclContext())
3336 ? AMK_ProtocolImplementation
3337 : isa<ObjCImplDecl>(newMethod->getDeclContext()) ? AMK_Redeclaration
3340 mergeDeclAttributes(newMethod, oldMethod, MergeKind);
3342 // Merge attributes from the parameters.
3343 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(),
3344 oe = oldMethod->param_end();
3345 for (ObjCMethodDecl::param_iterator
3346 ni = newMethod->param_begin(), ne = newMethod->param_end();
3347 ni != ne && oi != oe; ++ni, ++oi)
3348 mergeParamDeclAttributes(*ni, *oi, *this);
3350 CheckObjCMethodOverride(newMethod, oldMethod);
3353 static void diagnoseVarDeclTypeMismatch(Sema &S, VarDecl *New, VarDecl* Old) {
3354 assert(!S.Context.hasSameType(New->getType(), Old->getType()));
3356 S.Diag(New->getLocation(), New->isThisDeclarationADefinition()
3357 ? diag::err_redefinition_different_type
3358 : diag::err_redeclaration_different_type)
3359 << New->getDeclName() << New->getType() << Old->getType();
3361 diag::kind PrevDiag;
3362 SourceLocation OldLocation;
3363 std::tie(PrevDiag, OldLocation)
3364 = getNoteDiagForInvalidRedeclaration(Old, New);
3365 S.Diag(OldLocation, PrevDiag);
3366 New->setInvalidDecl();
3369 /// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and
3370 /// scope as a previous declaration 'Old'. Figure out how to merge their types,
3371 /// emitting diagnostics as appropriate.
3373 /// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back
3374 /// to here in AddInitializerToDecl. We can't check them before the initializer
3376 void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old,
3377 bool MergeTypeWithOld) {
3378 if (New->isInvalidDecl() || Old->isInvalidDecl())
3382 if (getLangOpts().CPlusPlus) {
3383 if (New->getType()->isUndeducedType()) {
3384 // We don't know what the new type is until the initializer is attached.
3386 } else if (Context.hasSameType(New->getType(), Old->getType())) {
3387 // These could still be something that needs exception specs checked.
3388 return MergeVarDeclExceptionSpecs(New, Old);
3390 // C++ [basic.link]p10:
3391 // [...] the types specified by all declarations referring to a given
3392 // object or function shall be identical, except that declarations for an
3393 // array object can specify array types that differ by the presence or
3394 // absence of a major array bound (8.3.4).
3395 else if (Old->getType()->isArrayType() && New->getType()->isArrayType()) {
3396 const ArrayType *OldArray = Context.getAsArrayType(Old->getType());
3397 const ArrayType *NewArray = Context.getAsArrayType(New->getType());
3399 // We are merging a variable declaration New into Old. If it has an array
3400 // bound, and that bound differs from Old's bound, we should diagnose the
3402 if (!NewArray->isIncompleteArrayType() && !NewArray->isDependentType()) {
3403 for (VarDecl *PrevVD = Old->getMostRecentDecl(); PrevVD;
3404 PrevVD = PrevVD->getPreviousDecl()) {
3405 const ArrayType *PrevVDTy = Context.getAsArrayType(PrevVD->getType());
3406 if (PrevVDTy->isIncompleteArrayType() || PrevVDTy->isDependentType())
3409 if (!Context.hasSameType(NewArray, PrevVDTy))
3410 return diagnoseVarDeclTypeMismatch(*this, New, PrevVD);
3414 if (OldArray->isIncompleteArrayType() && NewArray->isArrayType()) {
3415 if (Context.hasSameType(OldArray->getElementType(),
3416 NewArray->getElementType()))
3417 MergedT = New->getType();
3419 // FIXME: Check visibility. New is hidden but has a complete type. If New
3420 // has no array bound, it should not inherit one from Old, if Old is not
3422 else if (OldArray->isArrayType() && NewArray->isIncompleteArrayType()) {
3423 if (Context.hasSameType(OldArray->getElementType(),
3424 NewArray->getElementType()))
3425 MergedT = Old->getType();
3428 else if (New->getType()->isObjCObjectPointerType() &&
3429 Old->getType()->isObjCObjectPointerType()) {
3430 MergedT = Context.mergeObjCGCQualifiers(New->getType(),
3435 // All declarations that refer to the same object or function shall have
3437 MergedT = Context.mergeTypes(New->getType(), Old->getType());
3439 if (MergedT.isNull()) {
3440 // It's OK if we couldn't merge types if either type is dependent, for a
3441 // block-scope variable. In other cases (static data members of class
3442 // templates, variable templates, ...), we require the types to be
3444 // FIXME: The C++ standard doesn't say anything about this.
3445 if ((New->getType()->isDependentType() ||
3446 Old->getType()->isDependentType()) && New->isLocalVarDecl()) {
3447 // If the old type was dependent, we can't merge with it, so the new type
3448 // becomes dependent for now. We'll reproduce the original type when we
3449 // instantiate the TypeSourceInfo for the variable.
3450 if (!New->getType()->isDependentType() && MergeTypeWithOld)
3451 New->setType(Context.DependentTy);
3454 return diagnoseVarDeclTypeMismatch(*this, New, Old);
3457 // Don't actually update the type on the new declaration if the old
3458 // declaration was an extern declaration in a different scope.
3459 if (MergeTypeWithOld)
3460 New->setType(MergedT);
3463 static bool mergeTypeWithPrevious(Sema &S, VarDecl *NewVD, VarDecl *OldVD,
3464 LookupResult &Previous) {
3466 // For an identifier with internal or external linkage declared
3467 // in a scope in which a prior declaration of that identifier is
3468 // visible, if the prior declaration specifies internal or
3469 // external linkage, the type of the identifier at the later
3470 // declaration becomes the composite type.
3472 // If the variable isn't visible, we do not merge with its type.
3473 if (Previous.isShadowed())
3476 if (S.getLangOpts().CPlusPlus) {
3477 // C++11 [dcl.array]p3:
3478 // If there is a preceding declaration of the entity in the same
3479 // scope in which the bound was specified, an omitted array bound
3480 // is taken to be the same as in that earlier declaration.
3481 return NewVD->isPreviousDeclInSameBlockScope() ||
3482 (!OldVD->getLexicalDeclContext()->isFunctionOrMethod() &&
3483 !NewVD->getLexicalDeclContext()->isFunctionOrMethod());
3485 // If the old declaration was function-local, don't merge with its
3486 // type unless we're in the same function.
3487 return !OldVD->getLexicalDeclContext()->isFunctionOrMethod() ||
3488 OldVD->getLexicalDeclContext() == NewVD->getLexicalDeclContext();
3492 /// MergeVarDecl - We just parsed a variable 'New' which has the same name
3493 /// and scope as a previous declaration 'Old'. Figure out how to resolve this
3494 /// situation, merging decls or emitting diagnostics as appropriate.
3496 /// Tentative definition rules (C99 6.9.2p2) are checked by
3497 /// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative
3498 /// definitions here, since the initializer hasn't been attached.
3500 void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) {
3501 // If the new decl is already invalid, don't do any other checking.
3502 if (New->isInvalidDecl())
3505 if (!shouldLinkPossiblyHiddenDecl(Previous, New))
3508 VarTemplateDecl *NewTemplate = New->getDescribedVarTemplate();
3510 // Verify the old decl was also a variable or variable template.
3511 VarDecl *Old = nullptr;
3512 VarTemplateDecl *OldTemplate = nullptr;
3513 if (Previous.isSingleResult()) {
3515 OldTemplate = dyn_cast<VarTemplateDecl>(Previous.getFoundDecl());
3516 Old = OldTemplate ? OldTemplate->getTemplatedDecl() : nullptr;
3519 dyn_cast<UsingShadowDecl>(Previous.getRepresentativeDecl()))
3520 if (checkUsingShadowRedecl<VarTemplateDecl>(*this, Shadow, NewTemplate))
3521 return New->setInvalidDecl();
3523 Old = dyn_cast<VarDecl>(Previous.getFoundDecl());
3526 dyn_cast<UsingShadowDecl>(Previous.getRepresentativeDecl()))
3527 if (checkUsingShadowRedecl<VarDecl>(*this, Shadow, New))
3528 return New->setInvalidDecl();
3532 Diag(New->getLocation(), diag::err_redefinition_different_kind)
3533 << New->getDeclName();
3534 Diag(Previous.getRepresentativeDecl()->getLocation(),
3535 diag::note_previous_definition);
3536 return New->setInvalidDecl();
3539 // Ensure the template parameters are compatible.
3541 !TemplateParameterListsAreEqual(NewTemplate->getTemplateParameters(),
3542 OldTemplate->getTemplateParameters(),
3543 /*Complain=*/true, TPL_TemplateMatch))
3544 return New->setInvalidDecl();
3546 // C++ [class.mem]p1:
3547 // A member shall not be declared twice in the member-specification [...]
3549 // Here, we need only consider static data members.
3550 if (Old->isStaticDataMember() && !New->isOutOfLine()) {
3551 Diag(New->getLocation(), diag::err_duplicate_member)
3552 << New->getIdentifier();
3553 Diag(Old->getLocation(), diag::note_previous_declaration);
3554 New->setInvalidDecl();
3557 mergeDeclAttributes(New, Old);
3558 // Warn if an already-declared variable is made a weak_import in a subsequent
3560 if (New->hasAttr<WeakImportAttr>() &&
3561 Old->getStorageClass() == SC_None &&
3562 !Old->hasAttr<WeakImportAttr>()) {
3563 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName();
3564 Diag(Old->getLocation(), diag::note_previous_definition);
3565 // Remove weak_import attribute on new declaration.
3566 New->dropAttr<WeakImportAttr>();
3569 if (New->hasAttr<InternalLinkageAttr>() &&
3570 !Old->hasAttr<InternalLinkageAttr>()) {
3571 Diag(New->getLocation(), diag::err_internal_linkage_redeclaration)
3572 << New->getDeclName();
3573 Diag(Old->getLocation(), diag::note_previous_definition);
3574 New->dropAttr<InternalLinkageAttr>();
3578 VarDecl *MostRecent = Old->getMostRecentDecl();
3579 if (MostRecent != Old) {
3580 MergeVarDeclTypes(New, MostRecent,
3581 mergeTypeWithPrevious(*this, New, MostRecent, Previous));
3582 if (New->isInvalidDecl())
3586 MergeVarDeclTypes(New, Old, mergeTypeWithPrevious(*this, New, Old, Previous));
3587 if (New->isInvalidDecl())
3590 diag::kind PrevDiag;
3591 SourceLocation OldLocation;
3592 std::tie(PrevDiag, OldLocation) =
3593 getNoteDiagForInvalidRedeclaration(Old, New);
3595 // [dcl.stc]p8: Check if we have a non-static decl followed by a static.
3596 if (New->getStorageClass() == SC_Static &&
3597 !New->isStaticDataMember() &&
3598 Old->hasExternalFormalLinkage()) {
3599 if (getLangOpts().MicrosoftExt) {
3600 Diag(New->getLocation(), diag::ext_static_non_static)
3601 << New->getDeclName();
3602 Diag(OldLocation, PrevDiag);
3604 Diag(New->getLocation(), diag::err_static_non_static)
3605 << New->getDeclName();
3606 Diag(OldLocation, PrevDiag);
3607 return New->setInvalidDecl();
3611 // For an identifier declared with the storage-class specifier
3612 // extern in a scope in which a prior declaration of that
3613 // identifier is visible,23) if the prior declaration specifies
3614 // internal or external linkage, the linkage of the identifier at
3615 // the later declaration is the same as the linkage specified at
3616 // the prior declaration. If no prior declaration is visible, or
3617 // if the prior declaration specifies no linkage, then the
3618 // identifier has external linkage.
3619 if (New->hasExternalStorage() && Old->hasLinkage())
3621 else if (New->getCanonicalDecl()->getStorageClass() != SC_Static &&
3622 !New->isStaticDataMember() &&
3623 Old->getCanonicalDecl()->getStorageClass() == SC_Static) {
3624 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName();
3625 Diag(OldLocation, PrevDiag);
3626 return New->setInvalidDecl();
3629 // Check if extern is followed by non-extern and vice-versa.
3630 if (New->hasExternalStorage() &&
3631 !Old->hasLinkage() && Old->isLocalVarDeclOrParm()) {
3632 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName();
3633 Diag(OldLocation, PrevDiag);
3634 return New->setInvalidDecl();
3636 if (Old->hasLinkage() && New->isLocalVarDeclOrParm() &&
3637 !New->hasExternalStorage()) {
3638 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName();
3639 Diag(OldLocation, PrevDiag);
3640 return New->setInvalidDecl();
3643 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup.
3645 // FIXME: The test for external storage here seems wrong? We still
3646 // need to check for mismatches.
3647 if (!New->hasExternalStorage() && !New->isFileVarDecl() &&
3648 // Don't complain about out-of-line definitions of static members.
3649 !(Old->getLexicalDeclContext()->isRecord() &&
3650 !New->getLexicalDeclContext()->isRecord())) {
3651 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName();
3652 Diag(OldLocation, PrevDiag);
3653 return New->setInvalidDecl();
3656 if (New->isInline() && !Old->getMostRecentDecl()->isInline()) {
3657 if (VarDecl *Def = Old->getDefinition()) {
3658 // C++1z [dcl.fcn.spec]p4:
3659 // If the definition of a variable appears in a translation unit before
3660 // its first declaration as inline, the program is ill-formed.
3661 Diag(New->getLocation(), diag::err_inline_decl_follows_def) << New;
3662 Diag(Def->getLocation(), diag::note_previous_definition);
3666 // If this redeclaration makes the function inline, we may need to add it to
3667 // UndefinedButUsed.
3668 if (!Old->isInline() && New->isInline() && Old->isUsed(false) &&
3669 !Old->getDefinition() && !New->isThisDeclarationADefinition())
3670 UndefinedButUsed.insert(std::make_pair(Old->getCanonicalDecl(),
3673 if (New->getTLSKind() != Old->getTLSKind()) {
3674 if (!Old->getTLSKind()) {
3675 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName();
3676 Diag(OldLocation, PrevDiag);
3677 } else if (!New->getTLSKind()) {
3678 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName();
3679 Diag(OldLocation, PrevDiag);
3681 // Do not allow redeclaration to change the variable between requiring
3682 // static and dynamic initialization.
3683 // FIXME: GCC allows this, but uses the TLS keyword on the first
3684 // declaration to determine the kind. Do we need to be compatible here?
3685 Diag(New->getLocation(), diag::err_thread_thread_different_kind)
3686 << New->getDeclName() << (New->getTLSKind() == VarDecl::TLS_Dynamic);
3687 Diag(OldLocation, PrevDiag);
3691 // C++ doesn't have tentative definitions, so go right ahead and check here.
3692 if (getLangOpts().CPlusPlus &&
3693 New->isThisDeclarationADefinition() == VarDecl::Definition) {
3694 if (Old->isStaticDataMember() && Old->getCanonicalDecl()->isInline() &&
3695 Old->getCanonicalDecl()->isConstexpr()) {
3696 // This definition won't be a definition any more once it's been merged.
3697 Diag(New->getLocation(),
3698 diag::warn_deprecated_redundant_constexpr_static_def);
3699 } else if (VarDecl *Def = Old->getDefinition()) {
3700 if (checkVarDeclRedefinition(Def, New))
3705 if (haveIncompatibleLanguageLinkages(Old, New)) {
3706 Diag(New->getLocation(), diag::err_different_language_linkage) << New;
3707 Diag(OldLocation, PrevDiag);
3708 New->setInvalidDecl();
3712 // Merge "used" flag.
3713 if (Old->getMostRecentDecl()->isUsed(false))
3716 // Keep a chain of previous declarations.
3717 New->setPreviousDecl(Old);
3719 NewTemplate->setPreviousDecl(OldTemplate);
3721 // Inherit access appropriately.
3722 New->setAccess(Old->getAccess());
3724 NewTemplate->setAccess(New->getAccess());
3726 if (Old->isInline())
3727 New->setImplicitlyInline();
3730 /// We've just determined that \p Old and \p New both appear to be definitions
3731 /// of the same variable. Either diagnose or fix the problem.
3732 bool Sema::checkVarDeclRedefinition(VarDecl *Old, VarDecl *New) {
3733 if (!hasVisibleDefinition(Old) &&
3734 (New->getFormalLinkage() == InternalLinkage ||
3736 New->getDescribedVarTemplate() ||
3737 New->getNumTemplateParameterLists() ||
3738 New->getDeclContext()->isDependentContext())) {
3739 // The previous definition is hidden, and multiple definitions are
3740 // permitted (in separate TUs). Demote this to a declaration.
3741 New->demoteThisDefinitionToDeclaration();
3743 // Make the canonical definition visible.
3744 if (auto *OldTD = Old->getDescribedVarTemplate())
3745 makeMergedDefinitionVisible(OldTD, New->getLocation());
3746 makeMergedDefinitionVisible(Old, New->getLocation());
3749 Diag(New->getLocation(), diag::err_redefinition) << New;
3750 Diag(Old->getLocation(), diag::note_previous_definition);
3751 New->setInvalidDecl();
3756 /// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with
3757 /// no declarator (e.g. "struct foo;") is parsed.
3759 Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, DeclSpec &DS,
3760 RecordDecl *&AnonRecord) {
3761 return ParsedFreeStandingDeclSpec(S, AS, DS, MultiTemplateParamsArg(), false,
3765 // The MS ABI changed between VS2013 and VS2015 with regard to numbers used to
3766 // disambiguate entities defined in different scopes.
3767 // While the VS2015 ABI fixes potential miscompiles, it is also breaks
3769 // We will pick our mangling number depending on which version of MSVC is being
3771 static unsigned getMSManglingNumber(const LangOptions &LO, Scope *S) {
3772 return LO.isCompatibleWithMSVC(LangOptions::MSVC2015)
3773 ? S->getMSCurManglingNumber()
3774 : S->getMSLastManglingNumber();
3777 void Sema::handleTagNumbering(const TagDecl *Tag, Scope *TagScope) {
3778 if (!Context.getLangOpts().CPlusPlus)
3781 if (isa<CXXRecordDecl>(Tag->getParent())) {
3782 // If this tag is the direct child of a class, number it if
3784 if (!Tag->getName().empty() || Tag->getTypedefNameForAnonDecl())
3786 MangleNumberingContext &MCtx =
3787 Context.getManglingNumberContext(Tag->getParent());
3788 Context.setManglingNumber(
3789 Tag, MCtx.getManglingNumber(
3790 Tag, getMSManglingNumber(getLangOpts(), TagScope)));
3794 // If this tag isn't a direct child of a class, number it if it is local.
3795 Decl *ManglingContextDecl;
3796 if (MangleNumberingContext *MCtx = getCurrentMangleNumberContext(
3797 Tag->getDeclContext(), ManglingContextDecl)) {
3798 Context.setManglingNumber(
3799 Tag, MCtx->getManglingNumber(
3800 Tag, getMSManglingNumber(getLangOpts(), TagScope)));
3804 void Sema::setTagNameForLinkagePurposes(TagDecl *TagFromDeclSpec,
3805 TypedefNameDecl *NewTD) {
3806 if (TagFromDeclSpec->isInvalidDecl())
3809 // Do nothing if the tag already has a name for linkage purposes.
3810 if (TagFromDeclSpec->hasNameForLinkage())
3813 // A well-formed anonymous tag must always be a TUK_Definition.
3814 assert(TagFromDeclSpec->isThisDeclarationADefinition());
3816 // The type must match the tag exactly; no qualifiers allowed.
3817 if (!Context.hasSameType(NewTD->getUnderlyingType(),
3818 Context.getTagDeclType(TagFromDeclSpec))) {
3819 if (getLangOpts().CPlusPlus)
3820 Context.addTypedefNameForUnnamedTagDecl(TagFromDeclSpec, NewTD);
3824 // If we've already computed linkage for the anonymous tag, then
3825 // adding a typedef name for the anonymous decl can change that
3826 // linkage, which might be a serious problem. Diagnose this as
3827 // unsupported and ignore the typedef name. TODO: we should
3828 // pursue this as a language defect and establish a formal rule
3829 // for how to handle it.
3830 if (TagFromDeclSpec->hasLinkageBeenComputed()) {
3831 Diag(NewTD->getLocation(), diag::err_typedef_changes_linkage);
3833 SourceLocation tagLoc = TagFromDeclSpec->getInnerLocStart();
3834 tagLoc = getLocForEndOfToken(tagLoc);
3836 llvm::SmallString<40> textToInsert;
3837 textToInsert += ' ';
3838 textToInsert += NewTD->getIdentifier()->getName();
3839 Diag(tagLoc, diag::note_typedef_changes_linkage)
3840 << FixItHint::CreateInsertion(tagLoc, textToInsert);
3844 // Otherwise, set this is the anon-decl typedef for the tag.
3845 TagFromDeclSpec->setTypedefNameForAnonDecl(NewTD);
3848 static unsigned GetDiagnosticTypeSpecifierID(DeclSpec::TST T) {
3850 case DeclSpec::TST_class:
3852 case DeclSpec::TST_struct:
3854 case DeclSpec::TST_interface:
3856 case DeclSpec::TST_union:
3858 case DeclSpec::TST_enum:
3861 llvm_unreachable("unexpected type specifier");
3865 /// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with
3866 /// no declarator (e.g. "struct foo;") is parsed. It also accepts template
3867 /// parameters to cope with template friend declarations.
3869 Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, DeclSpec &DS,
3870 MultiTemplateParamsArg TemplateParams,
3871 bool IsExplicitInstantiation,
3872 RecordDecl *&AnonRecord) {
3873 Decl *TagD = nullptr;
3874 TagDecl *Tag = nullptr;
3875 if (DS.getTypeSpecType() == DeclSpec::TST_class ||
3876 DS.getTypeSpecType() == DeclSpec::TST_struct ||
3877 DS.getTypeSpecType() == DeclSpec::TST_interface ||
3878 DS.getTypeSpecType() == DeclSpec::TST_union ||
3879 DS.getTypeSpecType() == DeclSpec::TST_enum) {
3880 TagD = DS.getRepAsDecl();
3882 if (!TagD) // We probably had an error
3885 // Note that the above type specs guarantee that the
3886 // type rep is a Decl, whereas in many of the others
3888 if (isa<TagDecl>(TagD))
3889 Tag = cast<TagDecl>(TagD);
3890 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD))
3891 Tag = CTD->getTemplatedDecl();
3895 handleTagNumbering(Tag, S);
3896 Tag->setFreeStanding();
3897 if (Tag->isInvalidDecl())
3901 if (unsigned TypeQuals = DS.getTypeQualifiers()) {
3902 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object
3903 // or incomplete types shall not be restrict-qualified."
3904 if (TypeQuals & DeclSpec::TQ_restrict)
3905 Diag(DS.getRestrictSpecLoc(),
3906 diag::err_typecheck_invalid_restrict_not_pointer_noarg)
3907 << DS.getSourceRange();
3910 if (DS.isInlineSpecified())
3911 Diag(DS.getInlineSpecLoc(), diag::err_inline_non_function)
3912 << getLangOpts().CPlusPlus1z;
3914 if (DS.isConstexprSpecified()) {
3915 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations
3916 // and definitions of functions and variables.
3918 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag)
3919 << GetDiagnosticTypeSpecifierID(DS.getTypeSpecType());
3921 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators);
3922 // Don't emit warnings after this error.
3926 if (DS.isConceptSpecified()) {
3927 // C++ Concepts TS [dcl.spec.concept]p1: A concept definition refers to
3928 // either a function concept and its definition or a variable concept and
3930 Diag(DS.getConceptSpecLoc(), diag::err_concept_wrong_decl_kind);
3934 DiagnoseFunctionSpecifiers(DS);
3936 if (DS.isFriendSpecified()) {
3937 // If we're dealing with a decl but not a TagDecl, assume that
3938 // whatever routines created it handled the friendship aspect.
3941 return ActOnFriendTypeDecl(S, DS, TemplateParams);
3944 const CXXScopeSpec &SS = DS.getTypeSpecScope();
3945 bool IsExplicitSpecialization =
3946 !TemplateParams.empty() && TemplateParams.back()->size() == 0;
3947 if (Tag && SS.isNotEmpty() && !Tag->isCompleteDefinition() &&
3948 !IsExplicitInstantiation && !IsExplicitSpecialization &&
3949 !isa<ClassTemplatePartialSpecializationDecl>(Tag)) {
3950 // Per C++ [dcl.type.elab]p1, a class declaration cannot have a
3951 // nested-name-specifier unless it is an explicit instantiation
3952 // or an explicit specialization.
3954 // FIXME: We allow class template partial specializations here too, per the
3955 // obvious intent of DR1819.
3957 // Per C++ [dcl.enum]p1, an opaque-enum-declaration can't either.
3958 Diag(SS.getBeginLoc(), diag::err_standalone_class_nested_name_specifier)
3959 << GetDiagnosticTypeSpecifierID(DS.getTypeSpecType()) << SS.getRange();
3963 // Track whether this decl-specifier declares anything.
3964 bool DeclaresAnything = true;
3966 // Handle anonymous struct definitions.
3967 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) {
3968 if (!Record->getDeclName() && Record->isCompleteDefinition() &&
3969 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) {
3970 if (getLangOpts().CPlusPlus ||
3971 Record->getDeclContext()->isRecord()) {
3972 // If CurContext is a DeclContext that can contain statements,
3973 // RecursiveASTVisitor won't visit the decls that
3974 // BuildAnonymousStructOrUnion() will put into CurContext.
3975 // Also store them here so that they can be part of the
3976 // DeclStmt that gets created in this case.
3977 // FIXME: Also return the IndirectFieldDecls created by
3978 // BuildAnonymousStructOr union, for the same reason?
3979 if (CurContext->isFunctionOrMethod())
3980 AnonRecord = Record;
3981 return BuildAnonymousStructOrUnion(S, DS, AS, Record,
3982 Context.getPrintingPolicy());
3985 DeclaresAnything = false;
3990 // A struct-declaration that does not declare an anonymous structure or
3991 // anonymous union shall contain a struct-declarator-list.
3993 // This rule also existed in C89 and C99; the grammar for struct-declaration
3994 // did not permit a struct-declaration without a struct-declarator-list.
3995 if (!getLangOpts().CPlusPlus && CurContext->isRecord() &&
3996 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) {
3997 // Check for Microsoft C extension: anonymous struct/union member.
3998 // Handle 2 kinds of anonymous struct/union:
4002 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct.
4003 // UNION_TYPE; <- where UNION_TYPE is a typedef union.
4004 if ((Tag && Tag->getDeclName()) ||
4005 DS.getTypeSpecType() == DeclSpec::TST_typename) {
4006 RecordDecl *Record = nullptr;
4008 Record = dyn_cast<RecordDecl>(Tag);
4009 else if (const RecordType *RT =
4010 DS.getRepAsType().get()->getAsStructureType())
4011 Record = RT->getDecl();
4012 else if (const RecordType *UT = DS.getRepAsType().get()->getAsUnionType())
4013 Record = UT->getDecl();
4015 if (Record && getLangOpts().MicrosoftExt) {
4016 Diag(DS.getLocStart(), diag::ext_ms_anonymous_record)
4017 << Record->isUnion() << DS.getSourceRange();
4018 return BuildMicrosoftCAnonymousStruct(S, DS, Record);
4021 DeclaresAnything = false;
4025 // Skip all the checks below if we have a type error.
4026 if (DS.getTypeSpecType() == DeclSpec::TST_error ||
4027 (TagD && TagD->isInvalidDecl()))
4030 if (getLangOpts().CPlusPlus &&
4031 DS.getStorageClassSpec() != DeclSpec::SCS_typedef)
4032 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag))
4033 if (Enum->enumerator_begin() == Enum->enumerator_end() &&
4034 !Enum->getIdentifier() && !Enum->isInvalidDecl())
4035 DeclaresAnything = false;
4037 if (!DS.isMissingDeclaratorOk()) {
4038 // Customize diagnostic for a typedef missing a name.
4039 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef)
4040 Diag(DS.getLocStart(), diag::ext_typedef_without_a_name)
4041 << DS.getSourceRange();
4043 DeclaresAnything = false;
4046 if (DS.isModulePrivateSpecified() &&
4047 Tag && Tag->getDeclContext()->isFunctionOrMethod())
4048 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class)
4049 << Tag->getTagKind()
4050 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc());
4052 ActOnDocumentableDecl(TagD);
4055 // A declaration [...] shall declare at least a declarator [...], a tag,
4056 // or the members of an enumeration.
4058 // [If there are no declarators], and except for the declaration of an
4059 // unnamed bit-field, the decl-specifier-seq shall introduce one or more
4060 // names into the program, or shall redeclare a name introduced by a
4061 // previous declaration.
4062 if (!DeclaresAnything) {
4063 // In C, we allow this as a (popular) extension / bug. Don't bother
4064 // producing further diagnostics for redundant qualifiers after this.
4065 Diag(DS.getLocStart(), diag::ext_no_declarators) << DS.getSourceRange();
4070 // If a storage-class-specifier appears in a decl-specifier-seq, [...] the
4071 // init-declarator-list of the declaration shall not be empty.
4072 // C++ [dcl.fct.spec]p1:
4073 // If a cv-qualifier appears in a decl-specifier-seq, the
4074 // init-declarator-list of the declaration shall not be empty.
4076 // Spurious qualifiers here appear to be valid in C.
4077 unsigned DiagID = diag::warn_standalone_specifier;
4078 if (getLangOpts().CPlusPlus)
4079 DiagID = diag::ext_standalone_specifier;
4081 // Note that a linkage-specification sets a storage class, but
4082 // 'extern "C" struct foo;' is actually valid and not theoretically
4084 if (DeclSpec::SCS SCS = DS.getStorageClassSpec()) {
4085 if (SCS == DeclSpec::SCS_mutable)
4086 // Since mutable is not a viable storage class specifier in C, there is
4087 // no reason to treat it as an extension. Instead, diagnose as an error.
4088 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_nonmember);
4089 else if (!DS.isExternInLinkageSpec() && SCS != DeclSpec::SCS_typedef)
4090 Diag(DS.getStorageClassSpecLoc(), DiagID)
4091 << DeclSpec::getSpecifierName(SCS);
4094 if (DeclSpec::TSCS TSCS = DS.getThreadStorageClassSpec())
4095 Diag(DS.getThreadStorageClassSpecLoc(), DiagID)
4096 << DeclSpec::getSpecifierName(TSCS);
4097 if (DS.getTypeQualifiers()) {
4098 if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
4099 Diag(DS.getConstSpecLoc(), DiagID) << "const";
4100 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
4101 Diag(DS.getConstSpecLoc(), DiagID) << "volatile";
4102 // Restrict is covered above.
4103 if (DS.getTypeQualifiers() & DeclSpec::TQ_atomic)
4104 Diag(DS.getAtomicSpecLoc(), DiagID) << "_Atomic";
4105 if (DS.getTypeQualifiers() & DeclSpec::TQ_unaligned)
4106 Diag(DS.getUnalignedSpecLoc(), DiagID) << "__unaligned";
4109 // Warn about ignored type attributes, for example:
4110 // __attribute__((aligned)) struct A;
4111 // Attributes should be placed after tag to apply to type declaration.
4112 if (!DS.getAttributes().empty()) {
4113 DeclSpec::TST TypeSpecType = DS.getTypeSpecType();
4114 if (TypeSpecType == DeclSpec::TST_class ||
4115 TypeSpecType == DeclSpec::TST_struct ||
4116 TypeSpecType == DeclSpec::TST_interface ||
4117 TypeSpecType == DeclSpec::TST_union ||
4118 TypeSpecType == DeclSpec::TST_enum) {
4119 for (AttributeList* attrs = DS.getAttributes().getList(); attrs;
4120 attrs = attrs->getNext())
4121 Diag(attrs->getLoc(), diag::warn_declspec_attribute_ignored)
4122 << attrs->getName() << GetDiagnosticTypeSpecifierID(TypeSpecType);
4129 /// We are trying to inject an anonymous member into the given scope;
4130 /// check if there's an existing declaration that can't be overloaded.
4132 /// \return true if this is a forbidden redeclaration
4133 static bool CheckAnonMemberRedeclaration(Sema &SemaRef,
4136 DeclarationName Name,
4137 SourceLocation NameLoc,
4139 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName,
4140 Sema::ForRedeclaration);
4141 if (!SemaRef.LookupName(R, S)) return false;
4143 // Pick a representative declaration.
4144 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl();
4145 assert(PrevDecl && "Expected a non-null Decl");
4147 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S))
4150 SemaRef.Diag(NameLoc, diag::err_anonymous_record_member_redecl)
4152 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
4157 /// InjectAnonymousStructOrUnionMembers - Inject the members of the
4158 /// anonymous struct or union AnonRecord into the owning context Owner
4159 /// and scope S. This routine will be invoked just after we realize
4160 /// that an unnamed union or struct is actually an anonymous union or
4167 /// }; // InjectAnonymousStructOrUnionMembers called here to inject i and
4168 /// // f into the surrounding scope.x
4171 /// This routine is recursive, injecting the names of nested anonymous
4172 /// structs/unions into the owning context and scope as well.
4174 InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, DeclContext *Owner,
4175 RecordDecl *AnonRecord, AccessSpecifier AS,
4176 SmallVectorImpl<NamedDecl *> &Chaining) {
4177 bool Invalid = false;
4179 // Look every FieldDecl and IndirectFieldDecl with a name.
4180 for (auto *D : AnonRecord->decls()) {
4181 if ((isa<FieldDecl>(D) || isa<IndirectFieldDecl>(D)) &&
4182 cast<NamedDecl>(D)->getDeclName()) {
4183 ValueDecl *VD = cast<ValueDecl>(D);
4184 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(),
4186 AnonRecord->isUnion())) {
4187 // C++ [class.union]p2:
4188 // The names of the members of an anonymous union shall be
4189 // distinct from the names of any other entity in the
4190 // scope in which the anonymous union is declared.
4193 // C++ [class.union]p2:
4194 // For the purpose of name lookup, after the anonymous union
4195 // definition, the members of the anonymous union are
4196 // considered to have been defined in the scope in which the
4197 // anonymous union is declared.
4198 unsigned OldChainingSize = Chaining.size();
4199 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD))
4200 Chaining.append(IF->chain_begin(), IF->chain_end());
4202 Chaining.push_back(VD);
4204 assert(Chaining.size() >= 2);
4205 NamedDecl **NamedChain =
4206 new (SemaRef.Context)NamedDecl*[Chaining.size()];
4207 for (unsigned i = 0; i < Chaining.size(); i++)
4208 NamedChain[i] = Chaining[i];
4210 IndirectFieldDecl *IndirectField = IndirectFieldDecl::Create(
4211 SemaRef.Context, Owner, VD->getLocation(), VD->getIdentifier(),
4212 VD->getType(), {NamedChain, Chaining.size()});
4214 for (const auto *Attr : VD->attrs())
4215 IndirectField->addAttr(Attr->clone(SemaRef.Context));
4217 IndirectField->setAccess(AS);
4218 IndirectField->setImplicit();
4219 SemaRef.PushOnScopeChains(IndirectField, S);
4221 // That includes picking up the appropriate access specifier.
4222 if (AS != AS_none) IndirectField->setAccess(AS);
4224 Chaining.resize(OldChainingSize);
4232 /// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to
4233 /// a VarDecl::StorageClass. Any error reporting is up to the caller:
4234 /// illegal input values are mapped to SC_None.
4236 StorageClassSpecToVarDeclStorageClass(const DeclSpec &DS) {
4237 DeclSpec::SCS StorageClassSpec = DS.getStorageClassSpec();
4238 assert(StorageClassSpec != DeclSpec::SCS_typedef &&
4239 "Parser allowed 'typedef' as storage class VarDecl.");
4240 switch (StorageClassSpec) {
4241 case DeclSpec::SCS_unspecified: return SC_None;
4242 case DeclSpec::SCS_extern:
4243 if (DS.isExternInLinkageSpec())
4246 case DeclSpec::SCS_static: return SC_Static;
4247 case DeclSpec::SCS_auto: return SC_Auto;
4248 case DeclSpec::SCS_register: return SC_Register;
4249 case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
4250 // Illegal SCSs map to None: error reporting is up to the caller.
4251 case DeclSpec::SCS_mutable: // Fall through.
4252 case DeclSpec::SCS_typedef: return SC_None;
4254 llvm_unreachable("unknown storage class specifier");
4257 static SourceLocation findDefaultInitializer(const CXXRecordDecl *Record) {
4258 assert(Record->hasInClassInitializer());
4260 for (const auto *I : Record->decls()) {
4261 const auto *FD = dyn_cast<FieldDecl>(I);
4262 if (const auto *IFD = dyn_cast<IndirectFieldDecl>(I))
4263 FD = IFD->getAnonField();
4264 if (FD && FD->hasInClassInitializer())
4265 return FD->getLocation();
4268 llvm_unreachable("couldn't find in-class initializer");
4271 static void checkDuplicateDefaultInit(Sema &S, CXXRecordDecl *Parent,
4272 SourceLocation DefaultInitLoc) {
4273 if (!Parent->isUnion() || !Parent->hasInClassInitializer())
4276 S.Diag(DefaultInitLoc, diag::err_multiple_mem_union_initialization);
4277 S.Diag(findDefaultInitializer(Parent), diag::note_previous_initializer) << 0;
4280 static void checkDuplicateDefaultInit(Sema &S, CXXRecordDecl *Parent,
4281 CXXRecordDecl *AnonUnion) {
4282 if (!Parent->isUnion() || !Parent->hasInClassInitializer())
4285 checkDuplicateDefaultInit(S, Parent, findDefaultInitializer(AnonUnion));
4288 /// BuildAnonymousStructOrUnion - Handle the declaration of an
4289 /// anonymous structure or union. Anonymous unions are a C++ feature
4290 /// (C++ [class.union]) and a C11 feature; anonymous structures
4291 /// are a C11 feature and GNU C++ extension.
4292 Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
4295 const PrintingPolicy &Policy) {
4296 DeclContext *Owner = Record->getDeclContext();
4298 // Diagnose whether this anonymous struct/union is an extension.
4299 if (Record->isUnion() && !getLangOpts().CPlusPlus && !getLangOpts().C11)
4300 Diag(Record->getLocation(), diag::ext_anonymous_union);
4301 else if (!Record->isUnion() && getLangOpts().CPlusPlus)
4302 Diag(Record->getLocation(), diag::ext_gnu_anonymous_struct);
4303 else if (!Record->isUnion() && !getLangOpts().C11)
4304 Diag(Record->getLocation(), diag::ext_c11_anonymous_struct);
4306 // C and C++ require different kinds of checks for anonymous
4308 bool Invalid = false;
4309 if (getLangOpts().CPlusPlus) {
4310 const char *PrevSpec = nullptr;
4312 if (Record->isUnion()) {
4313 // C++ [class.union]p6:
4314 // Anonymous unions declared in a named namespace or in the
4315 // global namespace shall be declared static.
4316 if (DS.getStorageClassSpec() != DeclSpec::SCS_static &&
4317 (isa<TranslationUnitDecl>(Owner) ||
4318 (isa<NamespaceDecl>(Owner) &&
4319 cast<NamespaceDecl>(Owner)->getDeclName()))) {
4320 Diag(Record->getLocation(), diag::err_anonymous_union_not_static)
4321 << FixItHint::CreateInsertion(Record->getLocation(), "static ");
4323 // Recover by adding 'static'.
4324 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(),
4325 PrevSpec, DiagID, Policy);
4327 // C++ [class.union]p6:
4328 // A storage class is not allowed in a declaration of an
4329 // anonymous union in a class scope.
4330 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
4331 isa<RecordDecl>(Owner)) {
4332 Diag(DS.getStorageClassSpecLoc(),
4333 diag::err_anonymous_union_with_storage_spec)
4334 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
4336 // Recover by removing the storage specifier.
4337 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified,
4339 PrevSpec, DiagID, Context.getPrintingPolicy());
4343 // Ignore const/volatile/restrict qualifiers.
4344 if (DS.getTypeQualifiers()) {
4345 if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
4346 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified)
4347 << Record->isUnion() << "const"
4348 << FixItHint::CreateRemoval(DS.getConstSpecLoc());
4349 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
4350 Diag(DS.getVolatileSpecLoc(),
4351 diag::ext_anonymous_struct_union_qualified)
4352 << Record->isUnion() << "volatile"
4353 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc());
4354 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict)
4355 Diag(DS.getRestrictSpecLoc(),
4356 diag::ext_anonymous_struct_union_qualified)
4357 << Record->isUnion() << "restrict"
4358 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc());
4359 if (DS.getTypeQualifiers() & DeclSpec::TQ_atomic)
4360 Diag(DS.getAtomicSpecLoc(),
4361 diag::ext_anonymous_struct_union_qualified)
4362 << Record->isUnion() << "_Atomic"
4363 << FixItHint::CreateRemoval(DS.getAtomicSpecLoc());
4364 if (DS.getTypeQualifiers() & DeclSpec::TQ_unaligned)
4365 Diag(DS.getUnalignedSpecLoc(),
4366 diag::ext_anonymous_struct_union_qualified)
4367 << Record->isUnion() << "__unaligned"
4368 << FixItHint::CreateRemoval(DS.getUnalignedSpecLoc());
4370 DS.ClearTypeQualifiers();
4373 // C++ [class.union]p2:
4374 // The member-specification of an anonymous union shall only
4375 // define non-static data members. [Note: nested types and
4376 // functions cannot be declared within an anonymous union. ]
4377 for (auto *Mem : Record->decls()) {
4378 if (auto *FD = dyn_cast<FieldDecl>(Mem)) {
4379 // C++ [class.union]p3:
4380 // An anonymous union shall not have private or protected
4381 // members (clause 11).
4382 assert(FD->getAccess() != AS_none);
4383 if (FD->getAccess() != AS_public) {
4384 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member)
4385 << Record->isUnion() << (FD->getAccess() == AS_protected);
4389 // C++ [class.union]p1
4390 // An object of a class with a non-trivial constructor, a non-trivial
4391 // copy constructor, a non-trivial destructor, or a non-trivial copy
4392 // assignment operator cannot be a member of a union, nor can an
4393 // array of such objects.
4394 if (CheckNontrivialField(FD))
4396 } else if (Mem->isImplicit()) {
4397 // Any implicit members are fine.
4398 } else if (isa<TagDecl>(Mem) && Mem->getDeclContext() != Record) {
4399 // This is a type that showed up in an
4400 // elaborated-type-specifier inside the anonymous struct or
4401 // union, but which actually declares a type outside of the
4402 // anonymous struct or union. It's okay.
4403 } else if (auto *MemRecord = dyn_cast<RecordDecl>(Mem)) {
4404 if (!MemRecord->isAnonymousStructOrUnion() &&
4405 MemRecord->getDeclName()) {
4406 // Visual C++ allows type definition in anonymous struct or union.
4407 if (getLangOpts().MicrosoftExt)
4408 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type)
4409 << Record->isUnion();
4411 // This is a nested type declaration.
4412 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type)
4413 << Record->isUnion();
4417 // This is an anonymous type definition within another anonymous type.
4418 // This is a popular extension, provided by Plan9, MSVC and GCC, but
4419 // not part of standard C++.
4420 Diag(MemRecord->getLocation(),
4421 diag::ext_anonymous_record_with_anonymous_type)
4422 << Record->isUnion();
4424 } else if (isa<AccessSpecDecl>(Mem)) {
4425 // Any access specifier is fine.
4426 } else if (isa<StaticAssertDecl>(Mem)) {
4427 // In C++1z, static_assert declarations are also fine.
4429 // We have something that isn't a non-static data
4430 // member. Complain about it.
4431 unsigned DK = diag::err_anonymous_record_bad_member;
4432 if (isa<TypeDecl>(Mem))
4433 DK = diag::err_anonymous_record_with_type;
4434 else if (isa<FunctionDecl>(Mem))
4435 DK = diag::err_anonymous_record_with_function;
4436 else if (isa<VarDecl>(Mem))
4437 DK = diag::err_anonymous_record_with_static;
4439 // Visual C++ allows type definition in anonymous struct or union.
4440 if (getLangOpts().MicrosoftExt &&
4441 DK == diag::err_anonymous_record_with_type)
4442 Diag(Mem->getLocation(), diag::ext_anonymous_record_with_type)
4443 << Record->isUnion();
4445 Diag(Mem->getLocation(), DK) << Record->isUnion();
4451 // C++11 [class.union]p8 (DR1460):
4452 // At most one variant member of a union may have a
4453 // brace-or-equal-initializer.
4454 if (cast<CXXRecordDecl>(Record)->hasInClassInitializer() &&
4456 checkDuplicateDefaultInit(*this, cast<CXXRecordDecl>(Owner),
4457 cast<CXXRecordDecl>(Record));
4460 if (!Record->isUnion() && !Owner->isRecord()) {
4461 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member)
4462 << getLangOpts().CPlusPlus;
4466 // Mock up a declarator.
4467 Declarator Dc(DS, Declarator::MemberContext);
4468 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S);
4469 assert(TInfo && "couldn't build declarator info for anonymous struct/union");
4471 // Create a declaration for this anonymous struct/union.
4472 NamedDecl *Anon = nullptr;
4473 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) {
4474 Anon = FieldDecl::Create(Context, OwningClass,
4476 Record->getLocation(),
4477 /*IdentifierInfo=*/nullptr,
4478 Context.getTypeDeclType(Record),
4480 /*BitWidth=*/nullptr, /*Mutable=*/false,
4481 /*InitStyle=*/ICIS_NoInit);
4482 Anon->setAccess(AS);
4483 if (getLangOpts().CPlusPlus)
4484 FieldCollector->Add(cast<FieldDecl>(Anon));
4486 DeclSpec::SCS SCSpec = DS.getStorageClassSpec();
4487 StorageClass SC = StorageClassSpecToVarDeclStorageClass(DS);
4488 if (SCSpec == DeclSpec::SCS_mutable) {
4489 // mutable can only appear on non-static class members, so it's always
4491 Diag(Record->getLocation(), diag::err_mutable_nonmember);
4496 Anon = VarDecl::Create(Context, Owner,
4498 Record->getLocation(), /*IdentifierInfo=*/nullptr,
4499 Context.getTypeDeclType(Record),
4502 // Default-initialize the implicit variable. This initialization will be
4503 // trivial in almost all cases, except if a union member has an in-class
4505 // union { int n = 0; };
4506 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false);
4508 Anon->setImplicit();
4510 // Mark this as an anonymous struct/union type.
4511 Record->setAnonymousStructOrUnion(true);
4513 // Add the anonymous struct/union object to the current
4514 // context. We'll be referencing this object when we refer to one of
4516 Owner->addDecl(Anon);
4518 // Inject the members of the anonymous struct/union into the owning
4519 // context and into the identifier resolver chain for name lookup
4521 SmallVector<NamedDecl*, 2> Chain;
4522 Chain.push_back(Anon);
4524 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, Chain))
4527 if (VarDecl *NewVD = dyn_cast<VarDecl>(Anon)) {
4528 if (getLangOpts().CPlusPlus && NewVD->isStaticLocal()) {
4529 Decl *ManglingContextDecl;
4530 if (MangleNumberingContext *MCtx = getCurrentMangleNumberContext(
4531 NewVD->getDeclContext(), ManglingContextDecl)) {
4532 Context.setManglingNumber(
4533 NewVD, MCtx->getManglingNumber(
4534 NewVD, getMSManglingNumber(getLangOpts(), S)));
4535 Context.setStaticLocalNumber(NewVD, MCtx->getStaticLocalNumber(NewVD));
4541 Anon->setInvalidDecl();
4546 /// BuildMicrosoftCAnonymousStruct - Handle the declaration of an
4547 /// Microsoft C anonymous structure.
4548 /// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx
4551 /// struct A { int a; };
4552 /// struct B { struct A; int b; };
4559 Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS,
4560 RecordDecl *Record) {
4561 assert(Record && "expected a record!");
4563 // Mock up a declarator.
4564 Declarator Dc(DS, Declarator::TypeNameContext);
4565 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S);
4566 assert(TInfo && "couldn't build declarator info for anonymous struct");
4568 auto *ParentDecl = cast<RecordDecl>(CurContext);
4569 QualType RecTy = Context.getTypeDeclType(Record);
4571 // Create a declaration for this anonymous struct.
4572 NamedDecl *Anon = FieldDecl::Create(Context,
4576 /*IdentifierInfo=*/nullptr,
4579 /*BitWidth=*/nullptr, /*Mutable=*/false,
4580 /*InitStyle=*/ICIS_NoInit);
4581 Anon->setImplicit();
4583 // Add the anonymous struct object to the current context.
4584 CurContext->addDecl(Anon);
4586 // Inject the members of the anonymous struct into the current
4587 // context and into the identifier resolver chain for name lookup
4589 SmallVector<NamedDecl*, 2> Chain;
4590 Chain.push_back(Anon);
4592 RecordDecl *RecordDef = Record->getDefinition();
4593 if (RequireCompleteType(Anon->getLocation(), RecTy,
4594 diag::err_field_incomplete) ||
4595 InjectAnonymousStructOrUnionMembers(*this, S, CurContext, RecordDef,
4597 Anon->setInvalidDecl();
4598 ParentDecl->setInvalidDecl();
4604 /// GetNameForDeclarator - Determine the full declaration name for the
4605 /// given Declarator.
4606 DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) {
4607 return GetNameFromUnqualifiedId(D.getName());
4610 /// \brief Retrieves the declaration name from a parsed unqualified-id.
4612 Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) {
4613 DeclarationNameInfo NameInfo;
4614 NameInfo.setLoc(Name.StartLocation);
4616 switch (Name.getKind()) {
4618 case UnqualifiedId::IK_ImplicitSelfParam:
4619 case UnqualifiedId::IK_Identifier:
4620 NameInfo.setName(Name.Identifier);
4621 NameInfo.setLoc(Name.StartLocation);
4624 case UnqualifiedId::IK_OperatorFunctionId:
4625 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName(
4626 Name.OperatorFunctionId.Operator));
4627 NameInfo.setLoc(Name.StartLocation);
4628 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc
4629 = Name.OperatorFunctionId.SymbolLocations[0];
4630 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc
4631 = Name.EndLocation.getRawEncoding();
4634 case UnqualifiedId::IK_LiteralOperatorId:
4635 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName(
4637 NameInfo.setLoc(Name.StartLocation);
4638 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation);
4641 case UnqualifiedId::IK_ConversionFunctionId: {
4642 TypeSourceInfo *TInfo;
4643 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo);
4645 return DeclarationNameInfo();
4646 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName(
4647 Context.getCanonicalType(Ty)));
4648 NameInfo.setLoc(Name.StartLocation);
4649 NameInfo.setNamedTypeInfo(TInfo);
4653 case UnqualifiedId::IK_ConstructorName: {
4654 TypeSourceInfo *TInfo;
4655 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo);
4657 return DeclarationNameInfo();
4658 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName(
4659 Context.getCanonicalType(Ty)));
4660 NameInfo.setLoc(Name.StartLocation);
4661 NameInfo.setNamedTypeInfo(TInfo);
4665 case UnqualifiedId::IK_ConstructorTemplateId: {
4666 // In well-formed code, we can only have a constructor
4667 // template-id that refers to the current context, so go there
4668 // to find the actual type being constructed.
4669 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext);
4670 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name)
4671 return DeclarationNameInfo();
4673 // Determine the type of the class being constructed.
4674 QualType CurClassType = Context.getTypeDeclType(CurClass);
4676 // FIXME: Check two things: that the template-id names the same type as
4677 // CurClassType, and that the template-id does not occur when the name
4680 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName(
4681 Context.getCanonicalType(CurClassType)));
4682 NameInfo.setLoc(Name.StartLocation);
4683 // FIXME: should we retrieve TypeSourceInfo?
4684 NameInfo.setNamedTypeInfo(nullptr);
4688 case UnqualifiedId::IK_DestructorName: {
4689 TypeSourceInfo *TInfo;
4690 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo);
4692 return DeclarationNameInfo();
4693 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName(
4694 Context.getCanonicalType(Ty)));
4695 NameInfo.setLoc(Name.StartLocation);
4696 NameInfo.setNamedTypeInfo(TInfo);
4700 case UnqualifiedId::IK_TemplateId: {
4701 TemplateName TName = Name.TemplateId->Template.get();
4702 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc;
4703 return Context.getNameForTemplate(TName, TNameLoc);
4706 } // switch (Name.getKind())
4708 llvm_unreachable("Unknown name kind");
4711 static QualType getCoreType(QualType Ty) {
4713 if (Ty->isPointerType() || Ty->isReferenceType())
4714 Ty = Ty->getPointeeType();
4715 else if (Ty->isArrayType())
4716 Ty = Ty->castAsArrayTypeUnsafe()->getElementType();
4718 return Ty.withoutLocalFastQualifiers();
4722 /// hasSimilarParameters - Determine whether the C++ functions Declaration
4723 /// and Definition have "nearly" matching parameters. This heuristic is
4724 /// used to improve diagnostics in the case where an out-of-line function
4725 /// definition doesn't match any declaration within the class or namespace.
4726 /// Also sets Params to the list of indices to the parameters that differ
4727 /// between the declaration and the definition. If hasSimilarParameters
4728 /// returns true and Params is empty, then all of the parameters match.
4729 static bool hasSimilarParameters(ASTContext &Context,
4730 FunctionDecl *Declaration,
4731 FunctionDecl *Definition,
4732 SmallVectorImpl<unsigned> &Params) {
4734 if (Declaration->param_size() != Definition->param_size())
4736 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) {
4737 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType();
4738 QualType DefParamTy = Definition->getParamDecl(Idx)->getType();
4740 // The parameter types are identical
4741 if (Context.hasSameType(DefParamTy, DeclParamTy))
4744 QualType DeclParamBaseTy = getCoreType(DeclParamTy);
4745 QualType DefParamBaseTy = getCoreType(DefParamTy);
4746 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier();
4747 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier();
4749 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) ||
4750 (DeclTyName && DeclTyName == DefTyName))
4751 Params.push_back(Idx);
4752 else // The two parameters aren't even close
4759 /// NeedsRebuildingInCurrentInstantiation - Checks whether the given
4760 /// declarator needs to be rebuilt in the current instantiation.
4761 /// Any bits of declarator which appear before the name are valid for
4762 /// consideration here. That's specifically the type in the decl spec
4763 /// and the base type in any member-pointer chunks.
4764 static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D,
4765 DeclarationName Name) {
4766 // The types we specifically need to rebuild are:
4767 // - typenames, typeofs, and decltypes
4768 // - types which will become injected class names
4769 // Of course, we also need to rebuild any type referencing such a
4770 // type. It's safest to just say "dependent", but we call out a
4773 DeclSpec &DS = D.getMutableDeclSpec();
4774 switch (DS.getTypeSpecType()) {
4775 case DeclSpec::TST_typename:
4776 case DeclSpec::TST_typeofType:
4777 case DeclSpec::TST_underlyingType:
4778 case DeclSpec::TST_atomic: {
4779 // Grab the type from the parser.
4780 TypeSourceInfo *TSI = nullptr;
4781 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI);
4782 if (T.isNull() || !T->isDependentType()) break;
4784 // Make sure there's a type source info. This isn't really much
4785 // of a waste; most dependent types should have type source info
4786 // attached already.
4788 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc());
4790 // Rebuild the type in the current instantiation.
4791 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name);
4792 if (!TSI) return true;
4794 // Store the new type back in the decl spec.
4795 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI);
4796 DS.UpdateTypeRep(LocType);
4800 case DeclSpec::TST_decltype:
4801 case DeclSpec::TST_typeofExpr: {
4802 Expr *E = DS.getRepAsExpr();
4803 ExprResult Result = S.RebuildExprInCurrentInstantiation(E);
4804 if (Result.isInvalid()) return true;
4805 DS.UpdateExprRep(Result.get());
4810 // Nothing to do for these decl specs.
4814 // It doesn't matter what order we do this in.
4815 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) {
4816 DeclaratorChunk &Chunk = D.getTypeObject(I);
4818 // The only type information in the declarator which can come
4819 // before the declaration name is the base type of a member
4821 if (Chunk.Kind != DeclaratorChunk::MemberPointer)
4824 // Rebuild the scope specifier in-place.
4825 CXXScopeSpec &SS = Chunk.Mem.Scope();
4826 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS))
4833 Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) {
4834 D.setFunctionDefinitionKind(FDK_Declaration);
4835 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg());
4837 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() &&
4838 Dcl && Dcl->getDeclContext()->isFileContext())
4839 Dcl->setTopLevelDeclInObjCContainer();
4841 if (getLangOpts().OpenCL)
4842 setCurrentOpenCLExtensionForDecl(Dcl);
4847 /// DiagnoseClassNameShadow - Implement C++ [class.mem]p13:
4848 /// If T is the name of a class, then each of the following shall have a
4849 /// name different from T:
4850 /// - every static data member of class T;
4851 /// - every member function of class T
4852 /// - every member of class T that is itself a type;
4853 /// \returns true if the declaration name violates these rules.
4854 bool Sema::DiagnoseClassNameShadow(DeclContext *DC,
4855 DeclarationNameInfo NameInfo) {
4856 DeclarationName Name = NameInfo.getName();
4858 CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC);
4859 while (Record && Record->isAnonymousStructOrUnion())
4860 Record = dyn_cast<CXXRecordDecl>(Record->getParent());
4861 if (Record && Record->getIdentifier() && Record->getDeclName() == Name) {
4862 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name;
4869 /// \brief Diagnose a declaration whose declarator-id has the given
4870 /// nested-name-specifier.
4872 /// \param SS The nested-name-specifier of the declarator-id.
4874 /// \param DC The declaration context to which the nested-name-specifier
4877 /// \param Name The name of the entity being declared.
4879 /// \param Loc The location of the name of the entity being declared.
4881 /// \returns true if we cannot safely recover from this error, false otherwise.
4882 bool Sema::diagnoseQualifiedDeclaration(CXXScopeSpec &SS, DeclContext *DC,
4883 DeclarationName Name,
4884 SourceLocation Loc) {
4885 DeclContext *Cur = CurContext;
4886 while (isa<LinkageSpecDecl>(Cur) || isa<CapturedDecl>(Cur))
4887 Cur = Cur->getParent();
4889 // If the user provided a superfluous scope specifier that refers back to the
4890 // class in which the entity is already declared, diagnose and ignore it.
4896 // Note, it was once ill-formed to give redundant qualification in all
4897 // contexts, but that rule was removed by DR482.
4898 if (Cur->Equals(DC)) {
4899 if (Cur->isRecord()) {
4900 Diag(Loc, LangOpts.MicrosoftExt ? diag::warn_member_extra_qualification
4901 : diag::err_member_extra_qualification)
4902 << Name << FixItHint::CreateRemoval(SS.getRange());
4905 Diag(Loc, diag::warn_namespace_member_extra_qualification) << Name;
4910 // Check whether the qualifying scope encloses the scope of the original
4912 if (!Cur->Encloses(DC)) {
4913 if (Cur->isRecord())
4914 Diag(Loc, diag::err_member_qualification)
4915 << Name << SS.getRange();
4916 else if (isa<TranslationUnitDecl>(DC))
4917 Diag(Loc, diag::err_invalid_declarator_global_scope)
4918 << Name << SS.getRange();
4919 else if (isa<FunctionDecl>(Cur))
4920 Diag(Loc, diag::err_invalid_declarator_in_function)
4921 << Name << SS.getRange();
4922 else if (isa<BlockDecl>(Cur))
4923 Diag(Loc, diag::err_invalid_declarator_in_block)
4924 << Name << SS.getRange();
4926 Diag(Loc, diag::err_invalid_declarator_scope)
4927 << Name << cast<NamedDecl>(Cur) << cast<NamedDecl>(DC) << SS.getRange();
4932 if (Cur->isRecord()) {
4933 // Cannot qualify members within a class.
4934 Diag(Loc, diag::err_member_qualification)
4935 << Name << SS.getRange();
4938 // C++ constructors and destructors with incorrect scopes can break
4939 // our AST invariants by having the wrong underlying types. If
4940 // that's the case, then drop this declaration entirely.
4941 if ((Name.getNameKind() == DeclarationName::CXXConstructorName ||
4942 Name.getNameKind() == DeclarationName::CXXDestructorName) &&
4943 !Context.hasSameType(Name.getCXXNameType(),
4944 Context.getTypeDeclType(cast<CXXRecordDecl>(Cur))))
4950 // C++11 [dcl.meaning]p1:
4951 // [...] "The nested-name-specifier of the qualified declarator-id shall
4952 // not begin with a decltype-specifer"
4953 NestedNameSpecifierLoc SpecLoc(SS.getScopeRep(), SS.location_data());
4954 while (SpecLoc.getPrefix())
4955 SpecLoc = SpecLoc.getPrefix();
4956 if (dyn_cast_or_null<DecltypeType>(
4957 SpecLoc.getNestedNameSpecifier()->getAsType()))
4958 Diag(Loc, diag::err_decltype_in_declarator)
4959 << SpecLoc.getTypeLoc().getSourceRange();
4964 NamedDecl *Sema::HandleDeclarator(Scope *S, Declarator &D,
4965 MultiTemplateParamsArg TemplateParamLists) {
4966 // TODO: consider using NameInfo for diagnostic.
4967 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
4968 DeclarationName Name = NameInfo.getName();
4970 // All of these full declarators require an identifier. If it doesn't have
4971 // one, the ParsedFreeStandingDeclSpec action should be used.
4972 if (D.isDecompositionDeclarator()) {
4973 return ActOnDecompositionDeclarator(S, D, TemplateParamLists);
4975 if (!D.isInvalidType()) // Reject this if we think it is valid.
4976 Diag(D.getDeclSpec().getLocStart(),
4977 diag::err_declarator_need_ident)
4978 << D.getDeclSpec().getSourceRange() << D.getSourceRange();
4980 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType))
4983 // The scope passed in may not be a decl scope. Zip up the scope tree until
4984 // we find one that is.
4985 while ((S->getFlags() & Scope::DeclScope) == 0 ||
4986 (S->getFlags() & Scope::TemplateParamScope) != 0)
4989 DeclContext *DC = CurContext;
4990 if (D.getCXXScopeSpec().isInvalid())
4992 else if (D.getCXXScopeSpec().isSet()) {
4993 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(),
4994 UPPC_DeclarationQualifier))
4997 bool EnteringContext = !D.getDeclSpec().isFriendSpecified();
4998 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext);
4999 if (!DC || isa<EnumDecl>(DC)) {
5000 // If we could not compute the declaration context, it's because the
5001 // declaration context is dependent but does not refer to a class,
5002 // class template, or class template partial specialization. Complain
5003 // and return early, to avoid the coming semantic disaster.
5004 Diag(D.getIdentifierLoc(),
5005 diag::err_template_qualified_declarator_no_match)
5006 << D.getCXXScopeSpec().getScopeRep()
5007 << D.getCXXScopeSpec().getRange();
5010 bool IsDependentContext = DC->isDependentContext();
5012 if (!IsDependentContext &&
5013 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC))
5016 // If a class is incomplete, do not parse entities inside it.
5017 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) {
5018 Diag(D.getIdentifierLoc(),
5019 diag::err_member_def_undefined_record)
5020 << Name << DC << D.getCXXScopeSpec().getRange();
5023 if (!D.getDeclSpec().isFriendSpecified()) {
5024 if (diagnoseQualifiedDeclaration(D.getCXXScopeSpec(), DC,
5025 Name, D.getIdentifierLoc())) {
5033 // Check whether we need to rebuild the type of the given
5034 // declaration in the current instantiation.
5035 if (EnteringContext && IsDependentContext &&
5036 TemplateParamLists.size() != 0) {
5037 ContextRAII SavedContext(*this, DC);
5038 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name))
5043 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
5044 QualType R = TInfo->getType();
5046 if (!R->isFunctionType() && DiagnoseClassNameShadow(DC, NameInfo))
5047 // If this is a typedef, we'll end up spewing multiple diagnostics.
5048 // Just return early; it's safer. If this is a function, let the
5049 // "constructor cannot have a return type" diagnostic handle it.
5050 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
5053 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
5054 UPPC_DeclarationType))
5057 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
5060 // See if this is a redefinition of a variable in the same scope.
5061 if (!D.getCXXScopeSpec().isSet()) {
5062 bool IsLinkageLookup = false;
5063 bool CreateBuiltins = false;
5065 // If the declaration we're planning to build will be a function
5066 // or object with linkage, then look for another declaration with
5067 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6).
5069 // If the declaration we're planning to build will be declared with
5070 // external linkage in the translation unit, create any builtin with
5072 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
5074 else if (CurContext->isFunctionOrMethod() &&
5075 (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern ||
5076 R->isFunctionType())) {
5077 IsLinkageLookup = true;
5079 CurContext->getEnclosingNamespaceContext()->isTranslationUnit();
5080 } else if (CurContext->getRedeclContext()->isTranslationUnit() &&
5081 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)
5082 CreateBuiltins = true;
5084 if (IsLinkageLookup)
5085 Previous.clear(LookupRedeclarationWithLinkage);
5087 LookupName(Previous, S, CreateBuiltins);
5088 } else { // Something like "int foo::x;"
5089 LookupQualifiedName(Previous, DC);
5091 // C++ [dcl.meaning]p1:
5092 // When the declarator-id is qualified, the declaration shall refer to a
5093 // previously declared member of the class or namespace to which the
5094 // qualifier refers (or, in the case of a namespace, of an element of the
5095 // inline namespace set of that namespace (7.3.1)) or to a specialization
5098 // Note that we already checked the context above, and that we do not have
5099 // enough information to make sure that Previous contains the declaration
5100 // we want to match. For example, given:
5107 // void X::f(int) { } // ill-formed
5109 // In this case, Previous will point to the overload set
5110 // containing the two f's declared in X, but neither of them
5113 // C++ [dcl.meaning]p1:
5114 // [...] the member shall not merely have been introduced by a
5115 // using-declaration in the scope of the class or namespace nominated by
5116 // the nested-name-specifier of the declarator-id.
5117 RemoveUsingDecls(Previous);
5120 if (Previous.isSingleResult() &&
5121 Previous.getFoundDecl()->isTemplateParameter()) {
5122 // Maybe we will complain about the shadowed template parameter.
5123 if (!D.isInvalidType())
5124 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(),
5125 Previous.getFoundDecl());
5127 // Just pretend that we didn't see the previous declaration.
5131 // In C++, the previous declaration we find might be a tag type
5132 // (class or enum). In this case, the new declaration will hide the
5133 // tag type. Note that this does does not apply if we're declaring a
5134 // typedef (C++ [dcl.typedef]p4).
5135 if (Previous.isSingleTagDecl() &&
5136 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef)
5139 // Check that there are no default arguments other than in the parameters
5140 // of a function declaration (C++ only).
5141 if (getLangOpts().CPlusPlus)
5142 CheckExtraCXXDefaultArguments(D);
5144 if (D.getDeclSpec().isConceptSpecified()) {
5145 // C++ Concepts TS [dcl.spec.concept]p1: The concept specifier shall be
5146 // applied only to the definition of a function template or variable
5147 // template, declared in namespace scope
5148 if (!TemplateParamLists.size()) {
5149 Diag(D.getDeclSpec().getConceptSpecLoc(),
5150 diag:: err_concept_wrong_decl_kind);
5154 if (!DC->getRedeclContext()->isFileContext()) {
5155 Diag(D.getIdentifierLoc(),
5156 diag::err_concept_decls_may_only_appear_in_namespace_scope);
5163 bool AddToScope = true;
5164 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) {
5165 if (TemplateParamLists.size()) {
5166 Diag(D.getIdentifierLoc(), diag::err_template_typedef);
5170 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous);
5171 } else if (R->isFunctionType()) {
5172 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous,
5176 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, TemplateParamLists,
5183 // If this has an identifier and is not a function template specialization,
5184 // add it to the scope stack.
5185 if (New->getDeclName() && AddToScope) {
5186 // Only make a locally-scoped extern declaration visible if it is the first
5187 // declaration of this entity. Qualified lookup for such an entity should
5188 // only find this declaration if there is no visible declaration of it.
5189 bool AddToContext = !D.isRedeclaration() || !New->isLocalExternDecl();
5190 PushOnScopeChains(New, S, AddToContext);
5192 CurContext->addHiddenDecl(New);
5195 if (isInOpenMPDeclareTargetContext())
5196 checkDeclIsAllowedInOpenMPTarget(nullptr, New);
5201 /// Helper method to turn variable array types into constant array
5202 /// types in certain situations which would otherwise be errors (for
5203 /// GCC compatibility).
5204 static QualType TryToFixInvalidVariablyModifiedType(QualType T,
5205 ASTContext &Context,
5206 bool &SizeIsNegative,
5207 llvm::APSInt &Oversized) {
5208 // This method tries to turn a variable array into a constant
5209 // array even when the size isn't an ICE. This is necessary
5210 // for compatibility with code that depends on gcc's buggy
5211 // constant expression folding, like struct {char x[(int)(char*)2];}
5212 SizeIsNegative = false;
5215 if (T->isDependentType())
5218 QualifierCollector Qs;
5219 const Type *Ty = Qs.strip(T);
5221 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) {
5222 QualType Pointee = PTy->getPointeeType();
5223 QualType FixedType =
5224 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative,
5226 if (FixedType.isNull()) return FixedType;
5227 FixedType = Context.getPointerType(FixedType);
5228 return Qs.apply(Context, FixedType);
5230 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) {
5231 QualType Inner = PTy->getInnerType();
5232 QualType FixedType =
5233 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative,
5235 if (FixedType.isNull()) return FixedType;
5236 FixedType = Context.getParenType(FixedType);
5237 return Qs.apply(Context, FixedType);
5240 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T);
5243 // FIXME: We should probably handle this case
5244 if (VLATy->getElementType()->isVariablyModifiedType())
5248 if (!VLATy->getSizeExpr() ||
5249 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context))
5252 // Check whether the array size is negative.
5253 if (Res.isSigned() && Res.isNegative()) {
5254 SizeIsNegative = true;
5258 // Check whether the array is too large to be addressed.
5259 unsigned ActiveSizeBits
5260 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(),
5262 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
5267 return Context.getConstantArrayType(VLATy->getElementType(),
5268 Res, ArrayType::Normal, 0);
5272 FixInvalidVariablyModifiedTypeLoc(TypeLoc SrcTL, TypeLoc DstTL) {
5273 SrcTL = SrcTL.getUnqualifiedLoc();
5274 DstTL = DstTL.getUnqualifiedLoc();
5275 if (PointerTypeLoc SrcPTL = SrcTL.getAs<PointerTypeLoc>()) {
5276 PointerTypeLoc DstPTL = DstTL.castAs<PointerTypeLoc>();
5277 FixInvalidVariablyModifiedTypeLoc(SrcPTL.getPointeeLoc(),
5278 DstPTL.getPointeeLoc());
5279 DstPTL.setStarLoc(SrcPTL.getStarLoc());
5282 if (ParenTypeLoc SrcPTL = SrcTL.getAs<ParenTypeLoc>()) {
5283 ParenTypeLoc DstPTL = DstTL.castAs<ParenTypeLoc>();
5284 FixInvalidVariablyModifiedTypeLoc(SrcPTL.getInnerLoc(),
5285 DstPTL.getInnerLoc());
5286 DstPTL.setLParenLoc(SrcPTL.getLParenLoc());
5287 DstPTL.setRParenLoc(SrcPTL.getRParenLoc());
5290 ArrayTypeLoc SrcATL = SrcTL.castAs<ArrayTypeLoc>();
5291 ArrayTypeLoc DstATL = DstTL.castAs<ArrayTypeLoc>();
5292 TypeLoc SrcElemTL = SrcATL.getElementLoc();
5293 TypeLoc DstElemTL = DstATL.getElementLoc();
5294 DstElemTL.initializeFullCopy(SrcElemTL);
5295 DstATL.setLBracketLoc(SrcATL.getLBracketLoc());
5296 DstATL.setSizeExpr(SrcATL.getSizeExpr());
5297 DstATL.setRBracketLoc(SrcATL.getRBracketLoc());
5300 /// Helper method to turn variable array types into constant array
5301 /// types in certain situations which would otherwise be errors (for
5302 /// GCC compatibility).
5303 static TypeSourceInfo*
5304 TryToFixInvalidVariablyModifiedTypeSourceInfo(TypeSourceInfo *TInfo,
5305 ASTContext &Context,
5306 bool &SizeIsNegative,
5307 llvm::APSInt &Oversized) {
5309 = TryToFixInvalidVariablyModifiedType(TInfo->getType(), Context,
5310 SizeIsNegative, Oversized);
5311 if (FixedTy.isNull())
5313 TypeSourceInfo *FixedTInfo = Context.getTrivialTypeSourceInfo(FixedTy);
5314 FixInvalidVariablyModifiedTypeLoc(TInfo->getTypeLoc(),
5315 FixedTInfo->getTypeLoc());
5319 /// \brief Register the given locally-scoped extern "C" declaration so
5320 /// that it can be found later for redeclarations. We include any extern "C"
5321 /// declaration that is not visible in the translation unit here, not just
5322 /// function-scope declarations.
5324 Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, Scope *S) {
5325 if (!getLangOpts().CPlusPlus &&
5326 ND->getLexicalDeclContext()->getRedeclContext()->isTranslationUnit())
5327 // Don't need to track declarations in the TU in C.
5330 // Note that we have a locally-scoped external with this name.
5331 Context.getExternCContextDecl()->makeDeclVisibleInContext(ND);
5334 NamedDecl *Sema::findLocallyScopedExternCDecl(DeclarationName Name) {
5335 // FIXME: We can have multiple results via __attribute__((overloadable)).
5336 auto Result = Context.getExternCContextDecl()->lookup(Name);
5337 return Result.empty() ? nullptr : *Result.begin();
5340 /// \brief Diagnose function specifiers on a declaration of an identifier that
5341 /// does not identify a function.
5342 void Sema::DiagnoseFunctionSpecifiers(const DeclSpec &DS) {
5343 // FIXME: We should probably indicate the identifier in question to avoid
5344 // confusion for constructs like "virtual int a(), b;"
5345 if (DS.isVirtualSpecified())
5346 Diag(DS.getVirtualSpecLoc(),
5347 diag::err_virtual_non_function);
5349 if (DS.isExplicitSpecified())
5350 Diag(DS.getExplicitSpecLoc(),
5351 diag::err_explicit_non_function);
5353 if (DS.isNoreturnSpecified())
5354 Diag(DS.getNoreturnSpecLoc(),
5355 diag::err_noreturn_non_function);
5359 Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
5360 TypeSourceInfo *TInfo, LookupResult &Previous) {
5361 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1).
5362 if (D.getCXXScopeSpec().isSet()) {
5363 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator)
5364 << D.getCXXScopeSpec().getRange();
5366 // Pretend we didn't see the scope specifier.
5371 DiagnoseFunctionSpecifiers(D.getDeclSpec());
5373 if (D.getDeclSpec().isInlineSpecified())
5374 Diag(D.getDeclSpec().getInlineSpecLoc(), diag::err_inline_non_function)
5375 << getLangOpts().CPlusPlus1z;
5376 if (D.getDeclSpec().isConstexprSpecified())
5377 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr)
5379 if (D.getDeclSpec().isConceptSpecified())
5380 Diag(D.getDeclSpec().getConceptSpecLoc(),
5381 diag::err_concept_wrong_decl_kind);
5383 if (D.getName().Kind != UnqualifiedId::IK_Identifier) {
5384 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier)
5385 << D.getName().getSourceRange();
5389 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo);
5390 if (!NewTD) return nullptr;
5392 // Handle attributes prior to checking for duplicates in MergeVarDecl
5393 ProcessDeclAttributes(S, NewTD, D);
5395 CheckTypedefForVariablyModifiedType(S, NewTD);
5397 bool Redeclaration = D.isRedeclaration();
5398 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration);
5399 D.setRedeclaration(Redeclaration);
5404 Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) {
5405 // C99 6.7.7p2: If a typedef name specifies a variably modified type
5406 // then it shall have block scope.
5407 // Note that variably modified types must be fixed before merging the decl so
5408 // that redeclarations will match.
5409 TypeSourceInfo *TInfo = NewTD->getTypeSourceInfo();
5410 QualType T = TInfo->getType();
5411 if (T->isVariablyModifiedType()) {
5412 getCurFunction()->setHasBranchProtectedScope();
5414 if (S->getFnParent() == nullptr) {
5415 bool SizeIsNegative;
5416 llvm::APSInt Oversized;
5417 TypeSourceInfo *FixedTInfo =
5418 TryToFixInvalidVariablyModifiedTypeSourceInfo(TInfo, Context,
5422 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size);
5423 NewTD->setTypeSourceInfo(FixedTInfo);
5426 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size);
5427 else if (T->isVariableArrayType())
5428 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope);
5429 else if (Oversized.getBoolValue())
5430 Diag(NewTD->getLocation(), diag::err_array_too_large)
5431 << Oversized.toString(10);
5433 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope);
5434 NewTD->setInvalidDecl();
5440 /// ActOnTypedefNameDecl - Perform semantic checking for a declaration which
5441 /// declares a typedef-name, either using the 'typedef' type specifier or via
5442 /// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'.
5444 Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD,
5445 LookupResult &Previous, bool &Redeclaration) {
5446 // Merge the decl with the existing one if appropriate. If the decl is
5447 // in an outer scope, it isn't the same thing.
5448 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/false,
5449 /*AllowInlineNamespace*/false);
5450 filterNonConflictingPreviousTypedefDecls(*this, NewTD, Previous);
5451 if (!Previous.empty()) {
5452 Redeclaration = true;
5453 MergeTypedefNameDecl(S, NewTD, Previous);
5456 // If this is the C FILE type, notify the AST context.
5457 if (IdentifierInfo *II = NewTD->getIdentifier())
5458 if (!NewTD->isInvalidDecl() &&
5459 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) {
5460 if (II->isStr("FILE"))
5461 Context.setFILEDecl(NewTD);
5462 else if (II->isStr("jmp_buf"))
5463 Context.setjmp_bufDecl(NewTD);
5464 else if (II->isStr("sigjmp_buf"))
5465 Context.setsigjmp_bufDecl(NewTD);
5466 else if (II->isStr("ucontext_t"))
5467 Context.setucontext_tDecl(NewTD);
5473 /// \brief Determines whether the given declaration is an out-of-scope
5474 /// previous declaration.
5476 /// This routine should be invoked when name lookup has found a
5477 /// previous declaration (PrevDecl) that is not in the scope where a
5478 /// new declaration by the same name is being introduced. If the new
5479 /// declaration occurs in a local scope, previous declarations with
5480 /// linkage may still be considered previous declarations (C99
5481 /// 6.2.2p4-5, C++ [basic.link]p6).
5483 /// \param PrevDecl the previous declaration found by name
5486 /// \param DC the context in which the new declaration is being
5489 /// \returns true if PrevDecl is an out-of-scope previous declaration
5490 /// for a new delcaration with the same name.
5492 isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC,
5493 ASTContext &Context) {
5497 if (!PrevDecl->hasLinkage())
5500 if (Context.getLangOpts().CPlusPlus) {
5501 // C++ [basic.link]p6:
5502 // If there is a visible declaration of an entity with linkage
5503 // having the same name and type, ignoring entities declared
5504 // outside the innermost enclosing namespace scope, the block
5505 // scope declaration declares that same entity and receives the
5506 // linkage of the previous declaration.
5507 DeclContext *OuterContext = DC->getRedeclContext();
5508 if (!OuterContext->isFunctionOrMethod())
5509 // This rule only applies to block-scope declarations.
5512 DeclContext *PrevOuterContext = PrevDecl->getDeclContext();
5513 if (PrevOuterContext->isRecord())
5514 // We found a member function: ignore it.
5517 // Find the innermost enclosing namespace for the new and
5518 // previous declarations.
5519 OuterContext = OuterContext->getEnclosingNamespaceContext();
5520 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext();
5522 // The previous declaration is in a different namespace, so it
5523 // isn't the same function.
5524 if (!OuterContext->Equals(PrevOuterContext))
5531 static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) {
5532 CXXScopeSpec &SS = D.getCXXScopeSpec();
5533 if (!SS.isSet()) return;
5534 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext()));
5537 bool Sema::inferObjCARCLifetime(ValueDecl *decl) {
5538 QualType type = decl->getType();
5539 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime();
5540 if (lifetime == Qualifiers::OCL_Autoreleasing) {
5541 // Various kinds of declaration aren't allowed to be __autoreleasing.
5542 unsigned kind = -1U;
5543 if (VarDecl *var = dyn_cast<VarDecl>(decl)) {
5544 if (var->hasAttr<BlocksAttr>())
5545 kind = 0; // __block
5546 else if (!var->hasLocalStorage())
5548 } else if (isa<ObjCIvarDecl>(decl)) {
5550 } else if (isa<FieldDecl>(decl)) {
5555 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var)
5558 } else if (lifetime == Qualifiers::OCL_None) {
5559 // Try to infer lifetime.
5560 if (!type->isObjCLifetimeType())
5563 lifetime = type->getObjCARCImplicitLifetime();
5564 type = Context.getLifetimeQualifiedType(type, lifetime);
5565 decl->setType(type);
5568 if (VarDecl *var = dyn_cast<VarDecl>(decl)) {
5569 // Thread-local variables cannot have lifetime.
5570 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone &&
5571 var->getTLSKind()) {
5572 Diag(var->getLocation(), diag::err_arc_thread_ownership)
5581 static void checkAttributesAfterMerging(Sema &S, NamedDecl &ND) {
5582 // Ensure that an auto decl is deduced otherwise the checks below might cache
5583 // the wrong linkage.
5584 assert(S.ParsingInitForAutoVars.count(&ND) == 0);
5586 // 'weak' only applies to declarations with external linkage.
5587 if (WeakAttr *Attr = ND.getAttr<WeakAttr>()) {
5588 if (!ND.isExternallyVisible()) {
5589 S.Diag(Attr->getLocation(), diag::err_attribute_weak_static);
5590 ND.dropAttr<WeakAttr>();
5593 if (WeakRefAttr *Attr = ND.getAttr<WeakRefAttr>()) {
5594 if (ND.isExternallyVisible()) {
5595 S.Diag(Attr->getLocation(), diag::err_attribute_weakref_not_static);
5596 ND.dropAttr<WeakRefAttr>();
5597 ND.dropAttr<AliasAttr>();
5601 if (auto *VD = dyn_cast<VarDecl>(&ND)) {
5602 if (VD->hasInit()) {
5603 if (const auto *Attr = VD->getAttr<AliasAttr>()) {
5604 assert(VD->isThisDeclarationADefinition() &&
5605 !VD->isExternallyVisible() && "Broken AliasAttr handled late!");
5606 S.Diag(Attr->getLocation(), diag::err_alias_is_definition) << VD << 0;
5607 VD->dropAttr<AliasAttr>();
5612 // 'selectany' only applies to externally visible variable declarations.
5613 // It does not apply to functions.
5614 if (SelectAnyAttr *Attr = ND.getAttr<SelectAnyAttr>()) {
5615 if (isa<FunctionDecl>(ND) || !ND.isExternallyVisible()) {
5616 S.Diag(Attr->getLocation(),
5617 diag::err_attribute_selectany_non_extern_data);
5618 ND.dropAttr<SelectAnyAttr>();
5622 if (const InheritableAttr *Attr = getDLLAttr(&ND)) {
5623 // dll attributes require external linkage. Static locals may have external
5624 // linkage but still cannot be explicitly imported or exported.
5625 auto *VD = dyn_cast<VarDecl>(&ND);
5626 if (!ND.isExternallyVisible() || (VD && VD->isStaticLocal())) {
5627 S.Diag(ND.getLocation(), diag::err_attribute_dll_not_extern)
5629 ND.setInvalidDecl();
5633 // Virtual functions cannot be marked as 'notail'.
5634 if (auto *Attr = ND.getAttr<NotTailCalledAttr>())
5635 if (auto *MD = dyn_cast<CXXMethodDecl>(&ND))
5636 if (MD->isVirtual()) {
5637 S.Diag(ND.getLocation(),
5638 diag::err_invalid_attribute_on_virtual_function)
5640 ND.dropAttr<NotTailCalledAttr>();
5644 static void checkDLLAttributeRedeclaration(Sema &S, NamedDecl *OldDecl,
5646 bool IsSpecialization,
5647 bool IsDefinition) {
5648 if (OldDecl->isInvalidDecl())
5651 if (TemplateDecl *OldTD = dyn_cast<TemplateDecl>(OldDecl)) {
5652 OldDecl = OldTD->getTemplatedDecl();
5653 if (!IsSpecialization)
5654 IsDefinition = false;
5656 if (TemplateDecl *NewTD = dyn_cast<TemplateDecl>(NewDecl))
5657 NewDecl = NewTD->getTemplatedDecl();
5659 if (!OldDecl || !NewDecl)
5662 const DLLImportAttr *OldImportAttr = OldDecl->getAttr<DLLImportAttr>();
5663 const DLLExportAttr *OldExportAttr = OldDecl->getAttr<DLLExportAttr>();
5664 const DLLImportAttr *NewImportAttr = NewDecl->getAttr<DLLImportAttr>();
5665 const DLLExportAttr *NewExportAttr = NewDecl->getAttr<DLLExportAttr>();
5667 // dllimport and dllexport are inheritable attributes so we have to exclude
5668 // inherited attribute instances.
5669 bool HasNewAttr = (NewImportAttr && !NewImportAttr->isInherited()) ||
5670 (NewExportAttr && !NewExportAttr->isInherited());
5672 // A redeclaration is not allowed to add a dllimport or dllexport attribute,
5673 // the only exception being explicit specializations.
5674 // Implicitly generated declarations are also excluded for now because there
5675 // is no other way to switch these to use dllimport or dllexport.
5676 bool AddsAttr = !(OldImportAttr || OldExportAttr) && HasNewAttr;
5678 if (AddsAttr && !IsSpecialization && !OldDecl->isImplicit()) {
5679 // Allow with a warning for free functions and global variables.
5680 bool JustWarn = false;
5681 if (!OldDecl->isCXXClassMember()) {
5682 auto *VD = dyn_cast<VarDecl>(OldDecl);
5683 if (VD && !VD->getDescribedVarTemplate())
5685 auto *FD = dyn_cast<FunctionDecl>(OldDecl);
5686 if (FD && FD->getTemplatedKind() == FunctionDecl::TK_NonTemplate)
5690 // We cannot change a declaration that's been used because IR has already
5691 // been emitted. Dllimported functions will still work though (modulo
5692 // address equality) as they can use the thunk.
5693 if (OldDecl->isUsed())
5694 if (!isa<FunctionDecl>(OldDecl) || !NewImportAttr)
5697 unsigned DiagID = JustWarn ? diag::warn_attribute_dll_redeclaration
5698 : diag::err_attribute_dll_redeclaration;
5699 S.Diag(NewDecl->getLocation(), DiagID)
5701 << (NewImportAttr ? (const Attr *)NewImportAttr : NewExportAttr);
5702 S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);
5704 NewDecl->setInvalidDecl();
5709 // A redeclaration is not allowed to drop a dllimport attribute, the only
5710 // exceptions being inline function definitions, local extern declarations,
5711 // qualified friend declarations or special MSVC extension: in the last case,
5712 // the declaration is treated as if it were marked dllexport.
5713 bool IsInline = false, IsStaticDataMember = false, IsQualifiedFriend = false;
5714 bool IsMicrosoft = S.Context.getTargetInfo().getCXXABI().isMicrosoft();
5715 if (const auto *VD = dyn_cast<VarDecl>(NewDecl)) {
5716 // Ignore static data because out-of-line definitions are diagnosed
5718 IsStaticDataMember = VD->isStaticDataMember();
5719 IsDefinition = VD->isThisDeclarationADefinition(S.Context) !=
5720 VarDecl::DeclarationOnly;
5721 } else if (const auto *FD = dyn_cast<FunctionDecl>(NewDecl)) {
5722 IsInline = FD->isInlined();
5723 IsQualifiedFriend = FD->getQualifier() &&
5724 FD->getFriendObjectKind() == Decl::FOK_Declared;
5727 if (OldImportAttr && !HasNewAttr && !IsInline && !IsStaticDataMember &&
5728 !NewDecl->isLocalExternDecl() && !IsQualifiedFriend) {
5729 if (IsMicrosoft && IsDefinition) {
5730 S.Diag(NewDecl->getLocation(),
5731 diag::warn_redeclaration_without_import_attribute)
5733 S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);
5734 NewDecl->dropAttr<DLLImportAttr>();
5735 NewDecl->addAttr(::new (S.Context) DLLExportAttr(
5736 NewImportAttr->getRange(), S.Context,
5737 NewImportAttr->getSpellingListIndex()));
5739 S.Diag(NewDecl->getLocation(),
5740 diag::warn_redeclaration_without_attribute_prev_attribute_ignored)
5741 << NewDecl << OldImportAttr;
5742 S.Diag(OldDecl->getLocation(), diag::note_previous_declaration);
5743 S.Diag(OldImportAttr->getLocation(), diag::note_previous_attribute);
5744 OldDecl->dropAttr<DLLImportAttr>();
5745 NewDecl->dropAttr<DLLImportAttr>();
5747 } else if (IsInline && OldImportAttr && !IsMicrosoft) {
5748 // In MinGW, seeing a function declared inline drops the dllimport attribute.
5749 OldDecl->dropAttr<DLLImportAttr>();
5750 NewDecl->dropAttr<DLLImportAttr>();
5751 S.Diag(NewDecl->getLocation(),
5752 diag::warn_dllimport_dropped_from_inline_function)
5753 << NewDecl << OldImportAttr;
5757 /// Given that we are within the definition of the given function,
5758 /// will that definition behave like C99's 'inline', where the
5759 /// definition is discarded except for optimization purposes?
5760 static bool isFunctionDefinitionDiscarded(Sema &S, FunctionDecl *FD) {
5761 // Try to avoid calling GetGVALinkageForFunction.
5763 // All cases of this require the 'inline' keyword.
5764 if (!FD->isInlined()) return false;
5766 // This is only possible in C++ with the gnu_inline attribute.
5767 if (S.getLangOpts().CPlusPlus && !FD->hasAttr<GNUInlineAttr>())
5770 // Okay, go ahead and call the relatively-more-expensive function.
5771 return S.Context.GetGVALinkageForFunction(FD) == GVA_AvailableExternally;
5774 /// Determine whether a variable is extern "C" prior to attaching
5775 /// an initializer. We can't just call isExternC() here, because that
5776 /// will also compute and cache whether the declaration is externally
5777 /// visible, which might change when we attach the initializer.
5779 /// This can only be used if the declaration is known to not be a
5780 /// redeclaration of an internal linkage declaration.
5786 /// Attaching the initializer here makes this declaration not externally
5787 /// visible, because its type has internal linkage.
5789 /// FIXME: This is a hack.
5790 template<typename T>
5791 static bool isIncompleteDeclExternC(Sema &S, const T *D) {
5792 if (S.getLangOpts().CPlusPlus) {
5793 // In C++, the overloadable attribute negates the effects of extern "C".
5794 if (!D->isInExternCContext() || D->template hasAttr<OverloadableAttr>())
5797 // So do CUDA's host/device attributes.
5798 if (S.getLangOpts().CUDA && (D->template hasAttr<CUDADeviceAttr>() ||
5799 D->template hasAttr<CUDAHostAttr>()))
5802 return D->isExternC();
5805 static bool shouldConsiderLinkage(const VarDecl *VD) {
5806 const DeclContext *DC = VD->getDeclContext()->getRedeclContext();
5807 if (DC->isFunctionOrMethod() || isa<OMPDeclareReductionDecl>(DC))
5808 return VD->hasExternalStorage();
5809 if (DC->isFileContext())
5813 llvm_unreachable("Unexpected context");
5816 static bool shouldConsiderLinkage(const FunctionDecl *FD) {
5817 const DeclContext *DC = FD->getDeclContext()->getRedeclContext();
5818 if (DC->isFileContext() || DC->isFunctionOrMethod() ||
5819 isa<OMPDeclareReductionDecl>(DC))
5823 llvm_unreachable("Unexpected context");
5826 static bool hasParsedAttr(Scope *S, const AttributeList *AttrList,
5827 AttributeList::Kind Kind) {
5828 for (const AttributeList *L = AttrList; L; L = L->getNext())
5829 if (L->getKind() == Kind)
5834 static bool hasParsedAttr(Scope *S, const Declarator &PD,
5835 AttributeList::Kind Kind) {
5836 // Check decl attributes on the DeclSpec.
5837 if (hasParsedAttr(S, PD.getDeclSpec().getAttributes().getList(), Kind))
5840 // Walk the declarator structure, checking decl attributes that were in a type
5841 // position to the decl itself.
5842 for (unsigned I = 0, E = PD.getNumTypeObjects(); I != E; ++I) {
5843 if (hasParsedAttr(S, PD.getTypeObject(I).getAttrs(), Kind))
5847 // Finally, check attributes on the decl itself.
5848 return hasParsedAttr(S, PD.getAttributes(), Kind);
5851 /// Adjust the \c DeclContext for a function or variable that might be a
5852 /// function-local external declaration.
5853 bool Sema::adjustContextForLocalExternDecl(DeclContext *&DC) {
5854 if (!DC->isFunctionOrMethod())
5857 // If this is a local extern function or variable declared within a function
5858 // template, don't add it into the enclosing namespace scope until it is
5859 // instantiated; it might have a dependent type right now.
5860 if (DC->isDependentContext())
5863 // C++11 [basic.link]p7:
5864 // When a block scope declaration of an entity with linkage is not found to
5865 // refer to some other declaration, then that entity is a member of the
5866 // innermost enclosing namespace.
5868 // Per C++11 [namespace.def]p6, the innermost enclosing namespace is a
5869 // semantically-enclosing namespace, not a lexically-enclosing one.
5870 while (!DC->isFileContext() && !isa<LinkageSpecDecl>(DC))
5871 DC = DC->getParent();
5875 /// \brief Returns true if given declaration has external C language linkage.
5876 static bool isDeclExternC(const Decl *D) {
5877 if (const auto *FD = dyn_cast<FunctionDecl>(D))
5878 return FD->isExternC();
5879 if (const auto *VD = dyn_cast<VarDecl>(D))
5880 return VD->isExternC();
5882 llvm_unreachable("Unknown type of decl!");
5885 NamedDecl *Sema::ActOnVariableDeclarator(
5886 Scope *S, Declarator &D, DeclContext *DC, TypeSourceInfo *TInfo,
5887 LookupResult &Previous, MultiTemplateParamsArg TemplateParamLists,
5888 bool &AddToScope, ArrayRef<BindingDecl *> Bindings) {
5889 QualType R = TInfo->getType();
5890 DeclarationName Name = GetNameForDeclarator(D).getName();
5892 IdentifierInfo *II = Name.getAsIdentifierInfo();
5894 if (D.isDecompositionDeclarator()) {
5896 // Take the name of the first declarator as our name for diagnostic
5898 auto &Decomp = D.getDecompositionDeclarator();
5899 if (!Decomp.bindings().empty()) {
5900 II = Decomp.bindings()[0].Name;
5904 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name)
5909 if (getLangOpts().OpenCL) {
5910 // OpenCL v2.0 s6.9.b - Image type can only be used as a function argument.
5911 // OpenCL v2.0 s6.13.16.1 - Pipe type can only be used as a function
5913 if (R->isImageType() || R->isPipeType()) {
5914 Diag(D.getIdentifierLoc(),
5915 diag::err_opencl_type_can_only_be_used_as_function_parameter)
5921 // OpenCL v1.2 s6.9.r:
5922 // The event type cannot be used to declare a program scope variable.
5923 // OpenCL v2.0 s6.9.q:
5924 // The clk_event_t and reserve_id_t types cannot be declared in program scope.
5925 if (NULL == S->getParent()) {
5926 if (R->isReserveIDT() || R->isClkEventT() || R->isEventT()) {
5927 Diag(D.getIdentifierLoc(),
5928 diag::err_invalid_type_for_program_scope_var) << R;
5934 // OpenCL v1.0 s6.8.a.3: Pointers to functions are not allowed.
5936 while (NR->isPointerType()) {
5937 if (NR->isFunctionPointerType()) {
5938 Diag(D.getIdentifierLoc(), diag::err_opencl_function_pointer_variable);
5942 NR = NR->getPointeeType();
5945 if (!getOpenCLOptions().isEnabled("cl_khr_fp16")) {
5946 // OpenCL v1.2 s6.1.1.1: reject declaring variables of the half and
5947 // half array type (unless the cl_khr_fp16 extension is enabled).
5948 if (Context.getBaseElementType(R)->isHalfType()) {
5949 Diag(D.getIdentifierLoc(), diag::err_opencl_half_declaration) << R;
5954 // OpenCL v1.2 s6.9.b p4:
5955 // The sampler type cannot be used with the __local and __global address
5956 // space qualifiers.
5957 if (R->isSamplerT() && (R.getAddressSpace() == LangAS::opencl_local ||
5958 R.getAddressSpace() == LangAS::opencl_global)) {
5959 Diag(D.getIdentifierLoc(), diag::err_wrong_sampler_addressspace);
5962 // OpenCL v1.2 s6.9.r:
5963 // The event type cannot be used with the __local, __constant and __global
5964 // address space qualifiers.
5965 if (R->isEventT()) {
5966 if (R.getAddressSpace()) {
5967 Diag(D.getLocStart(), diag::err_event_t_addr_space_qual);
5973 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec();
5974 StorageClass SC = StorageClassSpecToVarDeclStorageClass(D.getDeclSpec());
5976 // dllimport globals without explicit storage class are treated as extern. We
5977 // have to change the storage class this early to get the right DeclContext.
5978 if (SC == SC_None && !DC->isRecord() &&
5979 hasParsedAttr(S, D, AttributeList::AT_DLLImport) &&
5980 !hasParsedAttr(S, D, AttributeList::AT_DLLExport))
5983 DeclContext *OriginalDC = DC;
5984 bool IsLocalExternDecl = SC == SC_Extern &&
5985 adjustContextForLocalExternDecl(DC);
5987 if (SCSpec == DeclSpec::SCS_mutable) {
5988 // mutable can only appear on non-static class members, so it's always
5990 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember);
5995 if (getLangOpts().CPlusPlus11 && SCSpec == DeclSpec::SCS_register &&
5996 !D.getAsmLabel() && !getSourceManager().isInSystemMacro(
5997 D.getDeclSpec().getStorageClassSpecLoc())) {
5998 // In C++11, the 'register' storage class specifier is deprecated.
5999 // Suppress the warning in system macros, it's used in macros in some
6000 // popular C system headers, such as in glibc's htonl() macro.
6001 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
6002 getLangOpts().CPlusPlus1z ? diag::ext_register_storage_class
6003 : diag::warn_deprecated_register)
6004 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
6007 DiagnoseFunctionSpecifiers(D.getDeclSpec());
6009 if (!DC->isRecord() && S->getFnParent() == nullptr) {
6010 // C99 6.9p2: The storage-class specifiers auto and register shall not
6011 // appear in the declaration specifiers in an external declaration.
6012 // Global Register+Asm is a GNU extension we support.
6013 if (SC == SC_Auto || (SC == SC_Register && !D.getAsmLabel())) {
6014 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope);
6019 bool IsExplicitSpecialization = false;
6020 bool IsVariableTemplateSpecialization = false;
6021 bool IsPartialSpecialization = false;
6022 bool IsVariableTemplate = false;
6023 VarDecl *NewVD = nullptr;
6024 VarTemplateDecl *NewTemplate = nullptr;
6025 TemplateParameterList *TemplateParams = nullptr;
6026 if (!getLangOpts().CPlusPlus) {
6027 NewVD = VarDecl::Create(Context, DC, D.getLocStart(),
6028 D.getIdentifierLoc(), II,
6031 if (D.getDeclSpec().containsPlaceholderType() && R->getContainedAutoType())
6032 ParsingInitForAutoVars.insert(NewVD);
6034 if (D.isInvalidType())
6035 NewVD->setInvalidDecl();
6037 bool Invalid = false;
6039 if (DC->isRecord() && !CurContext->isRecord()) {
6040 // This is an out-of-line definition of a static data member.
6045 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
6046 diag::err_static_out_of_line)
6047 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
6052 // [dcl.stc] p2: The auto or register specifiers shall be applied only
6053 // to names of variables declared in a block or to function parameters.
6054 // [dcl.stc] p6: The extern specifier cannot be used in the declaration
6057 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
6058 diag::err_storage_class_for_static_member)
6059 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
6061 case SC_PrivateExtern:
6062 llvm_unreachable("C storage class in c++!");
6066 if (SC == SC_Static && CurContext->isRecord()) {
6067 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) {
6068 if (RD->isLocalClass())
6069 Diag(D.getIdentifierLoc(),
6070 diag::err_static_data_member_not_allowed_in_local_class)
6071 << Name << RD->getDeclName();
6073 // C++98 [class.union]p1: If a union contains a static data member,
6074 // the program is ill-formed. C++11 drops this restriction.
6076 Diag(D.getIdentifierLoc(),
6077 getLangOpts().CPlusPlus11
6078 ? diag::warn_cxx98_compat_static_data_member_in_union
6079 : diag::ext_static_data_member_in_union) << Name;
6080 // We conservatively disallow static data members in anonymous structs.
6081 else if (!RD->getDeclName())
6082 Diag(D.getIdentifierLoc(),
6083 diag::err_static_data_member_not_allowed_in_anon_struct)
6084 << Name << RD->isUnion();
6088 // Match up the template parameter lists with the scope specifier, then
6089 // determine whether we have a template or a template specialization.
6090 TemplateParams = MatchTemplateParametersToScopeSpecifier(
6091 D.getDeclSpec().getLocStart(), D.getIdentifierLoc(),
6092 D.getCXXScopeSpec(),
6093 D.getName().getKind() == UnqualifiedId::IK_TemplateId
6094 ? D.getName().TemplateId
6097 /*never a friend*/ false, IsExplicitSpecialization, Invalid);
6099 if (TemplateParams) {
6100 if (!TemplateParams->size() &&
6101 D.getName().getKind() != UnqualifiedId::IK_TemplateId) {
6102 // There is an extraneous 'template<>' for this variable. Complain
6103 // about it, but allow the declaration of the variable.
6104 Diag(TemplateParams->getTemplateLoc(),
6105 diag::err_template_variable_noparams)
6107 << SourceRange(TemplateParams->getTemplateLoc(),
6108 TemplateParams->getRAngleLoc());
6109 TemplateParams = nullptr;
6111 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) {
6112 // This is an explicit specialization or a partial specialization.
6113 // FIXME: Check that we can declare a specialization here.
6114 IsVariableTemplateSpecialization = true;
6115 IsPartialSpecialization = TemplateParams->size() > 0;
6116 } else { // if (TemplateParams->size() > 0)
6117 // This is a template declaration.
6118 IsVariableTemplate = true;
6120 // Check that we can declare a template here.
6121 if (CheckTemplateDeclScope(S, TemplateParams))
6124 // Only C++1y supports variable templates (N3651).
6125 Diag(D.getIdentifierLoc(),
6126 getLangOpts().CPlusPlus14
6127 ? diag::warn_cxx11_compat_variable_template
6128 : diag::ext_variable_template);
6133 (Invalid || D.getName().getKind() != UnqualifiedId::IK_TemplateId) &&
6134 "should have a 'template<>' for this decl");
6137 if (IsVariableTemplateSpecialization) {
6138 SourceLocation TemplateKWLoc =
6139 TemplateParamLists.size() > 0
6140 ? TemplateParamLists[0]->getTemplateLoc()
6142 DeclResult Res = ActOnVarTemplateSpecialization(
6143 S, D, TInfo, TemplateKWLoc, TemplateParams, SC,
6144 IsPartialSpecialization);
6145 if (Res.isInvalid())
6147 NewVD = cast<VarDecl>(Res.get());
6149 } else if (D.isDecompositionDeclarator()) {
6150 NewVD = DecompositionDecl::Create(Context, DC, D.getLocStart(),
6151 D.getIdentifierLoc(), R, TInfo, SC,
6154 NewVD = VarDecl::Create(Context, DC, D.getLocStart(),
6155 D.getIdentifierLoc(), II, R, TInfo, SC);
6157 // If this is supposed to be a variable template, create it as such.
6158 if (IsVariableTemplate) {
6160 VarTemplateDecl::Create(Context, DC, D.getIdentifierLoc(), Name,
6161 TemplateParams, NewVD);
6162 NewVD->setDescribedVarTemplate(NewTemplate);
6165 // If this decl has an auto type in need of deduction, make a note of the
6166 // Decl so we can diagnose uses of it in its own initializer.
6167 if (D.getDeclSpec().containsPlaceholderType() && R->getContainedAutoType())
6168 ParsingInitForAutoVars.insert(NewVD);
6170 if (D.isInvalidType() || Invalid) {
6171 NewVD->setInvalidDecl();
6173 NewTemplate->setInvalidDecl();
6176 SetNestedNameSpecifier(NewVD, D);
6178 // If we have any template parameter lists that don't directly belong to
6179 // the variable (matching the scope specifier), store them.
6180 unsigned VDTemplateParamLists = TemplateParams ? 1 : 0;
6181 if (TemplateParamLists.size() > VDTemplateParamLists)
6182 NewVD->setTemplateParameterListsInfo(
6183 Context, TemplateParamLists.drop_back(VDTemplateParamLists));
6185 if (D.getDeclSpec().isConstexprSpecified()) {
6186 NewVD->setConstexpr(true);
6187 // C++1z [dcl.spec.constexpr]p1:
6188 // A static data member declared with the constexpr specifier is
6189 // implicitly an inline variable.
6190 if (NewVD->isStaticDataMember() && getLangOpts().CPlusPlus1z)
6191 NewVD->setImplicitlyInline();
6194 if (D.getDeclSpec().isConceptSpecified()) {
6195 if (VarTemplateDecl *VTD = NewVD->getDescribedVarTemplate())
6198 // C++ Concepts TS [dcl.spec.concept]p2: A concept definition shall not
6199 // be declared with the thread_local, inline, friend, or constexpr
6200 // specifiers, [...]
6201 if (D.getDeclSpec().getThreadStorageClassSpec() == TSCS_thread_local) {
6202 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(),
6203 diag::err_concept_decl_invalid_specifiers)
6205 NewVD->setInvalidDecl(true);
6208 if (D.getDeclSpec().isConstexprSpecified()) {
6209 Diag(D.getDeclSpec().getConstexprSpecLoc(),
6210 diag::err_concept_decl_invalid_specifiers)
6212 NewVD->setInvalidDecl(true);
6215 // C++ Concepts TS [dcl.spec.concept]p1: The concept specifier shall be
6216 // applied only to the definition of a function template or variable
6217 // template, declared in namespace scope.
6218 if (IsVariableTemplateSpecialization) {
6219 Diag(D.getDeclSpec().getConceptSpecLoc(),
6220 diag::err_concept_specified_specialization)
6221 << (IsPartialSpecialization ? 2 : 1);
6224 // C++ Concepts TS [dcl.spec.concept]p6: A variable concept has the
6225 // following restrictions:
6226 // - The declared type shall have the type bool.
6227 if (!Context.hasSameType(NewVD->getType(), Context.BoolTy) &&
6228 !NewVD->isInvalidDecl()) {
6229 Diag(D.getIdentifierLoc(), diag::err_variable_concept_bool_decl);
6230 NewVD->setInvalidDecl(true);
6235 if (D.getDeclSpec().isInlineSpecified()) {
6236 if (!getLangOpts().CPlusPlus) {
6237 Diag(D.getDeclSpec().getInlineSpecLoc(), diag::err_inline_non_function)
6239 } else if (CurContext->isFunctionOrMethod()) {
6240 // 'inline' is not allowed on block scope variable declaration.
6241 Diag(D.getDeclSpec().getInlineSpecLoc(),
6242 diag::err_inline_declaration_block_scope) << Name
6243 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc());
6245 Diag(D.getDeclSpec().getInlineSpecLoc(),
6246 getLangOpts().CPlusPlus1z ? diag::warn_cxx14_compat_inline_variable
6247 : diag::ext_inline_variable);
6248 NewVD->setInlineSpecified();
6252 // Set the lexical context. If the declarator has a C++ scope specifier, the
6253 // lexical context will be different from the semantic context.
6254 NewVD->setLexicalDeclContext(CurContext);
6256 NewTemplate->setLexicalDeclContext(CurContext);
6258 if (IsLocalExternDecl) {
6259 if (D.isDecompositionDeclarator())
6260 for (auto *B : Bindings)
6261 B->setLocalExternDecl();
6263 NewVD->setLocalExternDecl();
6266 bool EmitTLSUnsupportedError = false;
6267 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec()) {
6268 // C++11 [dcl.stc]p4:
6269 // When thread_local is applied to a variable of block scope the
6270 // storage-class-specifier static is implied if it does not appear
6272 // Core issue: 'static' is not implied if the variable is declared
6274 if (NewVD->hasLocalStorage() &&
6275 (SCSpec != DeclSpec::SCS_unspecified ||
6276 TSCS != DeclSpec::TSCS_thread_local ||
6277 !DC->isFunctionOrMethod()))
6278 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(),
6279 diag::err_thread_non_global)
6280 << DeclSpec::getSpecifierName(TSCS);
6281 else if (!Context.getTargetInfo().isTLSSupported()) {
6282 if (getLangOpts().CUDA) {
6283 // Postpone error emission until we've collected attributes required to
6284 // figure out whether it's a host or device variable and whether the
6285 // error should be ignored.
6286 EmitTLSUnsupportedError = true;
6287 // We still need to mark the variable as TLS so it shows up in AST with
6288 // proper storage class for other tools to use even if we're not going
6289 // to emit any code for it.
6290 NewVD->setTSCSpec(TSCS);
6292 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(),
6293 diag::err_thread_unsupported);
6295 NewVD->setTSCSpec(TSCS);
6299 // An inline definition of a function with external linkage shall
6300 // not contain a definition of a modifiable object with static or
6301 // thread storage duration...
6302 // We only apply this when the function is required to be defined
6303 // elsewhere, i.e. when the function is not 'extern inline'. Note
6304 // that a local variable with thread storage duration still has to
6305 // be marked 'static'. Also note that it's possible to get these
6306 // semantics in C++ using __attribute__((gnu_inline)).
6307 if (SC == SC_Static && S->getFnParent() != nullptr &&
6308 !NewVD->getType().isConstQualified()) {
6309 FunctionDecl *CurFD = getCurFunctionDecl();
6310 if (CurFD && isFunctionDefinitionDiscarded(*this, CurFD)) {
6311 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
6312 diag::warn_static_local_in_extern_inline);
6313 MaybeSuggestAddingStaticToDecl(CurFD);
6317 if (D.getDeclSpec().isModulePrivateSpecified()) {
6318 if (IsVariableTemplateSpecialization)
6319 Diag(NewVD->getLocation(), diag::err_module_private_specialization)
6320 << (IsPartialSpecialization ? 1 : 0)
6321 << FixItHint::CreateRemoval(
6322 D.getDeclSpec().getModulePrivateSpecLoc());
6323 else if (IsExplicitSpecialization)
6324 Diag(NewVD->getLocation(), diag::err_module_private_specialization)
6326 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
6327 else if (NewVD->hasLocalStorage())
6328 Diag(NewVD->getLocation(), diag::err_module_private_local)
6329 << 0 << NewVD->getDeclName()
6330 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
6331 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
6333 NewVD->setModulePrivate();
6335 NewTemplate->setModulePrivate();
6336 for (auto *B : Bindings)
6337 B->setModulePrivate();
6341 // Handle attributes prior to checking for duplicates in MergeVarDecl
6342 ProcessDeclAttributes(S, NewVD, D);
6344 if (getLangOpts().CUDA) {
6345 if (EmitTLSUnsupportedError && DeclAttrsMatchCUDAMode(getLangOpts(), NewVD))
6346 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(),
6347 diag::err_thread_unsupported);
6348 // CUDA B.2.5: "__shared__ and __constant__ variables have implied static
6349 // storage [duration]."
6350 if (SC == SC_None && S->getFnParent() != nullptr &&
6351 (NewVD->hasAttr<CUDASharedAttr>() ||
6352 NewVD->hasAttr<CUDAConstantAttr>())) {
6353 NewVD->setStorageClass(SC_Static);
6357 // Ensure that dllimport globals without explicit storage class are treated as
6358 // extern. The storage class is set above using parsed attributes. Now we can
6359 // check the VarDecl itself.
6360 assert(!NewVD->hasAttr<DLLImportAttr>() ||
6361 NewVD->getAttr<DLLImportAttr>()->isInherited() ||
6362 NewVD->isStaticDataMember() || NewVD->getStorageClass() != SC_None);
6364 // In auto-retain/release, infer strong retension for variables of
6366 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewVD))
6367 NewVD->setInvalidDecl();
6369 // Handle GNU asm-label extension (encoded as an attribute).
6370 if (Expr *E = (Expr*)D.getAsmLabel()) {
6371 // The parser guarantees this is a string.
6372 StringLiteral *SE = cast<StringLiteral>(E);
6373 StringRef Label = SE->getString();
6374 if (S->getFnParent() != nullptr) {
6378 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label;
6381 // Local Named register
6382 if (!Context.getTargetInfo().isValidGCCRegisterName(Label) &&
6383 DeclAttrsMatchCUDAMode(getLangOpts(), getCurFunctionDecl()))
6384 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label;
6388 case SC_PrivateExtern:
6391 } else if (SC == SC_Register) {
6392 // Global Named register
6393 if (DeclAttrsMatchCUDAMode(getLangOpts(), NewVD)) {
6394 const auto &TI = Context.getTargetInfo();
6395 bool HasSizeMismatch;
6397 if (!TI.isValidGCCRegisterName(Label))
6398 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label;
6399 else if (!TI.validateGlobalRegisterVariable(Label,
6400 Context.getTypeSize(R),
6402 Diag(E->getExprLoc(), diag::err_asm_invalid_global_var_reg) << Label;
6403 else if (HasSizeMismatch)
6404 Diag(E->getExprLoc(), diag::err_asm_register_size_mismatch) << Label;
6407 if (!R->isIntegralType(Context) && !R->isPointerType()) {
6408 Diag(D.getLocStart(), diag::err_asm_bad_register_type);
6409 NewVD->setInvalidDecl(true);
6413 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0),
6414 Context, Label, 0));
6415 } else if (!ExtnameUndeclaredIdentifiers.empty()) {
6416 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I =
6417 ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier());
6418 if (I != ExtnameUndeclaredIdentifiers.end()) {
6419 if (isDeclExternC(NewVD)) {
6420 NewVD->addAttr(I->second);
6421 ExtnameUndeclaredIdentifiers.erase(I);
6423 Diag(NewVD->getLocation(), diag::warn_redefine_extname_not_applied)
6424 << /*Variable*/1 << NewVD;
6428 // Diagnose shadowed variables before filtering for scope.
6429 if (D.getCXXScopeSpec().isEmpty())
6430 CheckShadow(S, NewVD, Previous);
6432 // Don't consider existing declarations that are in a different
6433 // scope and are out-of-semantic-context declarations (if the new
6434 // declaration has linkage).
6435 FilterLookupForScope(Previous, OriginalDC, S, shouldConsiderLinkage(NewVD),
6436 D.getCXXScopeSpec().isNotEmpty() ||
6437 IsExplicitSpecialization ||
6438 IsVariableTemplateSpecialization);
6440 // Check whether the previous declaration is in the same block scope. This
6441 // affects whether we merge types with it, per C++11 [dcl.array]p3.
6442 if (getLangOpts().CPlusPlus &&
6443 NewVD->isLocalVarDecl() && NewVD->hasExternalStorage())
6444 NewVD->setPreviousDeclInSameBlockScope(
6445 Previous.isSingleResult() && !Previous.isShadowed() &&
6446 isDeclInScope(Previous.getFoundDecl(), OriginalDC, S, false));
6448 if (!getLangOpts().CPlusPlus) {
6449 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous));
6451 // If this is an explicit specialization of a static data member, check it.
6452 if (IsExplicitSpecialization && !NewVD->isInvalidDecl() &&
6453 CheckMemberSpecialization(NewVD, Previous))
6454 NewVD->setInvalidDecl();
6456 // Merge the decl with the existing one if appropriate.
6457 if (!Previous.empty()) {
6458 if (Previous.isSingleResult() &&
6459 isa<FieldDecl>(Previous.getFoundDecl()) &&
6460 D.getCXXScopeSpec().isSet()) {
6461 // The user tried to define a non-static data member
6462 // out-of-line (C++ [dcl.meaning]p1).
6463 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line)
6464 << D.getCXXScopeSpec().getRange();
6466 NewVD->setInvalidDecl();
6468 } else if (D.getCXXScopeSpec().isSet()) {
6469 // No previous declaration in the qualifying scope.
6470 Diag(D.getIdentifierLoc(), diag::err_no_member)
6471 << Name << computeDeclContext(D.getCXXScopeSpec(), true)
6472 << D.getCXXScopeSpec().getRange();
6473 NewVD->setInvalidDecl();
6476 if (!IsVariableTemplateSpecialization)
6477 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous));
6479 // C++ Concepts TS [dcl.spec.concept]p7: A program shall not declare [...]
6480 // an explicit specialization (14.8.3) or a partial specialization of a
6481 // concept definition.
6482 if (IsVariableTemplateSpecialization &&
6483 !D.getDeclSpec().isConceptSpecified() && !Previous.empty() &&
6484 Previous.isSingleResult()) {
6485 NamedDecl *PreviousDecl = Previous.getFoundDecl();
6486 if (VarTemplateDecl *VarTmpl = dyn_cast<VarTemplateDecl>(PreviousDecl)) {
6487 if (VarTmpl->isConcept()) {
6488 Diag(NewVD->getLocation(), diag::err_concept_specialized)
6490 << (IsPartialSpecialization ? 2 /*partially specialized*/
6491 : 1 /*explicitly specialized*/);
6492 Diag(VarTmpl->getLocation(), diag::note_previous_declaration);
6493 NewVD->setInvalidDecl();
6499 VarTemplateDecl *PrevVarTemplate =
6500 NewVD->getPreviousDecl()
6501 ? NewVD->getPreviousDecl()->getDescribedVarTemplate()
6504 // Check the template parameter list of this declaration, possibly
6505 // merging in the template parameter list from the previous variable
6506 // template declaration.
6507 if (CheckTemplateParameterList(
6509 PrevVarTemplate ? PrevVarTemplate->getTemplateParameters()
6511 (D.getCXXScopeSpec().isSet() && DC && DC->isRecord() &&
6512 DC->isDependentContext())
6513 ? TPC_ClassTemplateMember
6515 NewVD->setInvalidDecl();
6517 // If we are providing an explicit specialization of a static variable
6518 // template, make a note of that.
6519 if (PrevVarTemplate &&
6520 PrevVarTemplate->getInstantiatedFromMemberTemplate())
6521 PrevVarTemplate->setMemberSpecialization();
6525 ProcessPragmaWeak(S, NewVD);
6527 // If this is the first declaration of an extern C variable, update
6528 // the map of such variables.
6529 if (NewVD->isFirstDecl() && !NewVD->isInvalidDecl() &&
6530 isIncompleteDeclExternC(*this, NewVD))
6531 RegisterLocallyScopedExternCDecl(NewVD, S);
6533 if (getLangOpts().CPlusPlus && NewVD->isStaticLocal()) {
6534 Decl *ManglingContextDecl;
6535 if (MangleNumberingContext *MCtx = getCurrentMangleNumberContext(
6536 NewVD->getDeclContext(), ManglingContextDecl)) {
6537 Context.setManglingNumber(
6538 NewVD, MCtx->getManglingNumber(
6539 NewVD, getMSManglingNumber(getLangOpts(), S)));
6540 Context.setStaticLocalNumber(NewVD, MCtx->getStaticLocalNumber(NewVD));
6544 // Special handling of variable named 'main'.
6545 if (Name.getAsIdentifierInfo() && Name.getAsIdentifierInfo()->isStr("main") &&
6546 NewVD->getDeclContext()->getRedeclContext()->isTranslationUnit() &&
6547 !getLangOpts().Freestanding && !NewVD->getDescribedVarTemplate()) {
6549 // C++ [basic.start.main]p3
6550 // A program that declares a variable main at global scope is ill-formed.
6551 if (getLangOpts().CPlusPlus)
6552 Diag(D.getLocStart(), diag::err_main_global_variable);
6554 // In C, and external-linkage variable named main results in undefined
6556 else if (NewVD->hasExternalFormalLinkage())
6557 Diag(D.getLocStart(), diag::warn_main_redefined);
6560 if (D.isRedeclaration() && !Previous.empty()) {
6561 checkDLLAttributeRedeclaration(
6562 *this, dyn_cast<NamedDecl>(Previous.getRepresentativeDecl()), NewVD,
6563 IsExplicitSpecialization, D.isFunctionDefinition());
6567 if (NewVD->isInvalidDecl())
6568 NewTemplate->setInvalidDecl();
6569 ActOnDocumentableDecl(NewTemplate);
6576 /// Enum describing the %select options in diag::warn_decl_shadow.
6577 enum ShadowedDeclKind { SDK_Local, SDK_Global, SDK_StaticMember, SDK_Field };
6579 /// Determine what kind of declaration we're shadowing.
6580 static ShadowedDeclKind computeShadowedDeclKind(const NamedDecl *ShadowedDecl,
6581 const DeclContext *OldDC) {
6582 if (isa<RecordDecl>(OldDC))
6583 return isa<FieldDecl>(ShadowedDecl) ? SDK_Field : SDK_StaticMember;
6584 return OldDC->isFileContext() ? SDK_Global : SDK_Local;
6587 /// Return the location of the capture if the given lambda captures the given
6588 /// variable \p VD, or an invalid source location otherwise.
6589 static SourceLocation getCaptureLocation(const LambdaScopeInfo *LSI,
6590 const VarDecl *VD) {
6591 for (const LambdaScopeInfo::Capture &Capture : LSI->Captures) {
6592 if (Capture.isVariableCapture() && Capture.getVariable() == VD)
6593 return Capture.getLocation();
6595 return SourceLocation();
6598 /// \brief Diagnose variable or built-in function shadowing. Implements
6601 /// This method is called whenever a VarDecl is added to a "useful"
6604 /// \param S the scope in which the shadowing name is being declared
6605 /// \param R the lookup of the name
6607 void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) {
6608 // Return if warning is ignored.
6609 if (Diags.isIgnored(diag::warn_decl_shadow, R.getNameLoc()))
6612 // Don't diagnose declarations at file scope.
6613 if (D->hasGlobalStorage())
6616 DeclContext *NewDC = D->getDeclContext();
6618 // Only diagnose if we're shadowing an unambiguous field or variable.
6619 if (R.getResultKind() != LookupResult::Found)
6622 NamedDecl* ShadowedDecl = R.getFoundDecl();
6623 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl))
6626 if (FieldDecl *FD = dyn_cast<FieldDecl>(ShadowedDecl)) {
6627 // Fields are not shadowed by variables in C++ static methods.
6628 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC))
6632 // Fields shadowed by constructor parameters are a special case. Usually
6633 // the constructor initializes the field with the parameter.
6634 if (isa<CXXConstructorDecl>(NewDC) && isa<ParmVarDecl>(D)) {
6635 // Remember that this was shadowed so we can either warn about its
6636 // modification or its existence depending on warning settings.
6637 D = D->getCanonicalDecl();
6638 ShadowingDecls.insert({D, FD});
6643 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl))
6644 if (shadowedVar->isExternC()) {
6645 // For shadowing external vars, make sure that we point to the global
6646 // declaration, not a locally scoped extern declaration.
6647 for (auto I : shadowedVar->redecls())
6648 if (I->isFileVarDecl()) {
6654 DeclContext *OldDC = ShadowedDecl->getDeclContext();
6656 unsigned WarningDiag = diag::warn_decl_shadow;
6657 SourceLocation CaptureLoc;
6658 if (isa<VarDecl>(ShadowedDecl) && NewDC && isa<CXXMethodDecl>(NewDC)) {
6659 if (const auto *RD = dyn_cast<CXXRecordDecl>(NewDC->getParent())) {
6660 if (RD->isLambda() && OldDC->Encloses(NewDC->getLexicalParent())) {
6661 if (RD->getLambdaCaptureDefault() == LCD_None) {
6662 // Try to avoid warnings for lambdas with an explicit capture list.
6663 const auto *LSI = cast<LambdaScopeInfo>(getCurFunction());
6664 // Warn only when the lambda captures the shadowed decl explicitly.
6665 CaptureLoc = getCaptureLocation(LSI, cast<VarDecl>(ShadowedDecl));
6666 if (CaptureLoc.isInvalid())
6667 WarningDiag = diag::warn_decl_shadow_uncaptured_local;
6669 // Remember that this was shadowed so we can avoid the warning if the
6670 // shadowed decl isn't captured and the warning settings allow it.
6671 cast<LambdaScopeInfo>(getCurFunction())
6672 ->ShadowingDecls.push_back({D, cast<VarDecl>(ShadowedDecl)});
6679 // Only warn about certain kinds of shadowing for class members.
6680 if (NewDC && NewDC->isRecord()) {
6681 // In particular, don't warn about shadowing non-class members.
6682 if (!OldDC->isRecord())
6685 // TODO: should we warn about static data members shadowing
6686 // static data members from base classes?
6688 // TODO: don't diagnose for inaccessible shadowed members.
6689 // This is hard to do perfectly because we might friend the
6690 // shadowing context, but that's just a false negative.
6694 DeclarationName Name = R.getLookupName();
6696 // Emit warning and note.
6697 if (getSourceManager().isInSystemMacro(R.getNameLoc()))
6699 ShadowedDeclKind Kind = computeShadowedDeclKind(ShadowedDecl, OldDC);
6700 Diag(R.getNameLoc(), WarningDiag) << Name << Kind << OldDC;
6701 if (!CaptureLoc.isInvalid())
6702 Diag(CaptureLoc, diag::note_var_explicitly_captured_here)
6703 << Name << /*explicitly*/ 1;
6704 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration);
6707 /// Diagnose shadowing for variables shadowed in the lambda record \p LambdaRD
6708 /// when these variables are captured by the lambda.
6709 void Sema::DiagnoseShadowingLambdaDecls(const LambdaScopeInfo *LSI) {
6710 for (const auto &Shadow : LSI->ShadowingDecls) {
6711 const VarDecl *ShadowedDecl = Shadow.ShadowedDecl;
6712 // Try to avoid the warning when the shadowed decl isn't captured.
6713 SourceLocation CaptureLoc = getCaptureLocation(LSI, ShadowedDecl);
6714 const DeclContext *OldDC = ShadowedDecl->getDeclContext();
6715 Diag(Shadow.VD->getLocation(), CaptureLoc.isInvalid()
6716 ? diag::warn_decl_shadow_uncaptured_local
6717 : diag::warn_decl_shadow)
6718 << Shadow.VD->getDeclName()
6719 << computeShadowedDeclKind(ShadowedDecl, OldDC) << OldDC;
6720 if (!CaptureLoc.isInvalid())
6721 Diag(CaptureLoc, diag::note_var_explicitly_captured_here)
6722 << Shadow.VD->getDeclName() << /*explicitly*/ 0;
6723 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration);
6727 /// \brief Check -Wshadow without the advantage of a previous lookup.
6728 void Sema::CheckShadow(Scope *S, VarDecl *D) {
6729 if (Diags.isIgnored(diag::warn_decl_shadow, D->getLocation()))
6732 LookupResult R(*this, D->getDeclName(), D->getLocation(),
6733 Sema::LookupOrdinaryName, Sema::ForRedeclaration);
6735 CheckShadow(S, D, R);
6738 /// Check if 'E', which is an expression that is about to be modified, refers
6739 /// to a constructor parameter that shadows a field.
6740 void Sema::CheckShadowingDeclModification(Expr *E, SourceLocation Loc) {
6741 // Quickly ignore expressions that can't be shadowing ctor parameters.
6742 if (!getLangOpts().CPlusPlus || ShadowingDecls.empty())
6744 E = E->IgnoreParenImpCasts();
6745 auto *DRE = dyn_cast<DeclRefExpr>(E);
6748 const NamedDecl *D = cast<NamedDecl>(DRE->getDecl()->getCanonicalDecl());
6749 auto I = ShadowingDecls.find(D);
6750 if (I == ShadowingDecls.end())
6752 const NamedDecl *ShadowedDecl = I->second;
6753 const DeclContext *OldDC = ShadowedDecl->getDeclContext();
6754 Diag(Loc, diag::warn_modifying_shadowing_decl) << D << OldDC;
6755 Diag(D->getLocation(), diag::note_var_declared_here) << D;
6756 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration);
6758 // Avoid issuing multiple warnings about the same decl.
6759 ShadowingDecls.erase(I);
6762 /// Check for conflict between this global or extern "C" declaration and
6763 /// previous global or extern "C" declarations. This is only used in C++.
6764 template<typename T>
6765 static bool checkGlobalOrExternCConflict(
6766 Sema &S, const T *ND, bool IsGlobal, LookupResult &Previous) {
6767 assert(S.getLangOpts().CPlusPlus && "only C++ has extern \"C\"");
6768 NamedDecl *Prev = S.findLocallyScopedExternCDecl(ND->getDeclName());
6770 if (!Prev && IsGlobal && !isIncompleteDeclExternC(S, ND)) {
6771 // The common case: this global doesn't conflict with any extern "C"
6777 if (!IsGlobal || isIncompleteDeclExternC(S, ND)) {
6778 // Both the old and new declarations have C language linkage. This is a
6781 Previous.addDecl(Prev);
6785 // This is a global, non-extern "C" declaration, and there is a previous
6786 // non-global extern "C" declaration. Diagnose if this is a variable
6788 if (!isa<VarDecl>(ND))
6791 // The declaration is extern "C". Check for any declaration in the
6792 // translation unit which might conflict.
6794 // We have already performed the lookup into the translation unit.
6796 for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
6798 if (isa<VarDecl>(*I)) {
6804 DeclContext::lookup_result R =
6805 S.Context.getTranslationUnitDecl()->lookup(ND->getDeclName());
6806 for (DeclContext::lookup_result::iterator I = R.begin(), E = R.end();
6808 if (isa<VarDecl>(*I)) {
6812 // FIXME: If we have any other entity with this name in global scope,
6813 // the declaration is ill-formed, but that is a defect: it breaks the
6814 // 'stat' hack, for instance. Only variables can have mangled name
6815 // clashes with extern "C" declarations, so only they deserve a
6824 // Use the first declaration's location to ensure we point at something which
6825 // is lexically inside an extern "C" linkage-spec.
6826 assert(Prev && "should have found a previous declaration to diagnose");
6827 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(Prev))
6828 Prev = FD->getFirstDecl();
6830 Prev = cast<VarDecl>(Prev)->getFirstDecl();
6832 S.Diag(ND->getLocation(), diag::err_extern_c_global_conflict)
6834 S.Diag(Prev->getLocation(), diag::note_extern_c_global_conflict)
6839 /// Apply special rules for handling extern "C" declarations. Returns \c true
6840 /// if we have found that this is a redeclaration of some prior entity.
6842 /// Per C++ [dcl.link]p6:
6843 /// Two declarations [for a function or variable] with C language linkage
6844 /// with the same name that appear in different scopes refer to the same
6845 /// [entity]. An entity with C language linkage shall not be declared with
6846 /// the same name as an entity in global scope.
6847 template<typename T>
6848 static bool checkForConflictWithNonVisibleExternC(Sema &S, const T *ND,
6849 LookupResult &Previous) {
6850 if (!S.getLangOpts().CPlusPlus) {
6851 // In C, when declaring a global variable, look for a corresponding 'extern'
6852 // variable declared in function scope. We don't need this in C++, because
6853 // we find local extern decls in the surrounding file-scope DeclContext.
6854 if (ND->getDeclContext()->getRedeclContext()->isTranslationUnit()) {
6855 if (NamedDecl *Prev = S.findLocallyScopedExternCDecl(ND->getDeclName())) {
6857 Previous.addDecl(Prev);
6864 // A declaration in the translation unit can conflict with an extern "C"
6866 if (ND->getDeclContext()->getRedeclContext()->isTranslationUnit())
6867 return checkGlobalOrExternCConflict(S, ND, /*IsGlobal*/true, Previous);
6869 // An extern "C" declaration can conflict with a declaration in the
6870 // translation unit or can be a redeclaration of an extern "C" declaration
6871 // in another scope.
6872 if (isIncompleteDeclExternC(S,ND))
6873 return checkGlobalOrExternCConflict(S, ND, /*IsGlobal*/false, Previous);
6875 // Neither global nor extern "C": nothing to do.
6879 void Sema::CheckVariableDeclarationType(VarDecl *NewVD) {
6880 // If the decl is already known invalid, don't check it.
6881 if (NewVD->isInvalidDecl())
6884 TypeSourceInfo *TInfo = NewVD->getTypeSourceInfo();
6885 QualType T = TInfo->getType();
6887 // Defer checking an 'auto' type until its initializer is attached.
6888 if (T->isUndeducedType())
6891 if (NewVD->hasAttrs())
6892 CheckAlignasUnderalignment(NewVD);
6894 if (T->isObjCObjectType()) {
6895 Diag(NewVD->getLocation(), diag::err_statically_allocated_object)
6896 << FixItHint::CreateInsertion(NewVD->getLocation(), "*");
6897 T = Context.getObjCObjectPointerType(T);
6901 // Emit an error if an address space was applied to decl with local storage.
6902 // This includes arrays of objects with address space qualifiers, but not
6903 // automatic variables that point to other address spaces.
6904 // ISO/IEC TR 18037 S5.1.2
6905 if (!getLangOpts().OpenCL
6906 && NewVD->hasLocalStorage() && T.getAddressSpace() != 0) {
6907 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl);
6908 NewVD->setInvalidDecl();
6912 // OpenCL v1.2 s6.8 - The static qualifier is valid only in program
6914 if (getLangOpts().OpenCLVersion == 120 &&
6915 !getOpenCLOptions().isEnabled("cl_clang_storage_class_specifiers") &&
6916 NewVD->isStaticLocal()) {
6917 Diag(NewVD->getLocation(), diag::err_static_function_scope);
6918 NewVD->setInvalidDecl();
6922 if (getLangOpts().OpenCL) {
6923 // OpenCL v2.0 s6.12.5 - The __block storage type is not supported.
6924 if (NewVD->hasAttr<BlocksAttr>()) {
6925 Diag(NewVD->getLocation(), diag::err_opencl_block_storage_type);
6929 if (T->isBlockPointerType()) {
6930 // OpenCL v2.0 s6.12.5 - Any block declaration must be const qualified and
6931 // can't use 'extern' storage class.
6932 if (!T.isConstQualified()) {
6933 Diag(NewVD->getLocation(), diag::err_opencl_invalid_block_declaration)
6935 NewVD->setInvalidDecl();
6938 if (NewVD->hasExternalStorage()) {
6939 Diag(NewVD->getLocation(), diag::err_opencl_extern_block_declaration);
6940 NewVD->setInvalidDecl();
6944 // OpenCL v1.2 s6.5 - All program scope variables must be declared in the
6945 // __constant address space.
6946 // OpenCL v2.0 s6.5.1 - Variables defined at program scope and static
6947 // variables inside a function can also be declared in the global
6949 if (NewVD->isFileVarDecl() || NewVD->isStaticLocal() ||
6950 NewVD->hasExternalStorage()) {
6951 if (!T->isSamplerT() &&
6952 !(T.getAddressSpace() == LangAS::opencl_constant ||
6953 (T.getAddressSpace() == LangAS::opencl_global &&
6954 getLangOpts().OpenCLVersion == 200))) {
6955 int Scope = NewVD->isStaticLocal() | NewVD->hasExternalStorage() << 1;
6956 if (getLangOpts().OpenCLVersion == 200)
6957 Diag(NewVD->getLocation(), diag::err_opencl_global_invalid_addr_space)
6958 << Scope << "global or constant";
6960 Diag(NewVD->getLocation(), diag::err_opencl_global_invalid_addr_space)
6961 << Scope << "constant";
6962 NewVD->setInvalidDecl();
6966 if (T.getAddressSpace() == LangAS::opencl_global) {
6967 Diag(NewVD->getLocation(), diag::err_opencl_function_variable)
6968 << 1 /*is any function*/ << "global";
6969 NewVD->setInvalidDecl();
6972 // OpenCL v1.1 s6.5.2 and s6.5.3 no local or constant variables
6974 if (T.getAddressSpace() == LangAS::opencl_constant ||
6975 T.getAddressSpace() == LangAS::opencl_local) {
6976 FunctionDecl *FD = getCurFunctionDecl();
6977 if (FD && !FD->hasAttr<OpenCLKernelAttr>()) {
6978 if (T.getAddressSpace() == LangAS::opencl_constant)
6979 Diag(NewVD->getLocation(), diag::err_opencl_function_variable)
6980 << 0 /*non-kernel only*/ << "constant";
6982 Diag(NewVD->getLocation(), diag::err_opencl_function_variable)
6983 << 0 /*non-kernel only*/ << "local";
6984 NewVD->setInvalidDecl();
6991 if (NewVD->hasLocalStorage() && T.isObjCGCWeak()
6992 && !NewVD->hasAttr<BlocksAttr>()) {
6993 if (getLangOpts().getGC() != LangOptions::NonGC)
6994 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local);
6996 assert(!getLangOpts().ObjCAutoRefCount);
6997 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local);
7001 bool isVM = T->isVariablyModifiedType();
7002 if (isVM || NewVD->hasAttr<CleanupAttr>() ||
7003 NewVD->hasAttr<BlocksAttr>())
7004 getCurFunction()->setHasBranchProtectedScope();
7006 if ((isVM && NewVD->hasLinkage()) ||
7007 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) {
7008 bool SizeIsNegative;
7009 llvm::APSInt Oversized;
7010 TypeSourceInfo *FixedTInfo =
7011 TryToFixInvalidVariablyModifiedTypeSourceInfo(TInfo, Context,
7012 SizeIsNegative, Oversized);
7013 if (!FixedTInfo && T->isVariableArrayType()) {
7014 const VariableArrayType *VAT = Context.getAsVariableArrayType(T);
7015 // FIXME: This won't give the correct result for
7017 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange();
7019 if (NewVD->isFileVarDecl())
7020 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope)
7022 else if (NewVD->isStaticLocal())
7023 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage)
7026 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage)
7028 NewVD->setInvalidDecl();
7033 if (NewVD->isFileVarDecl())
7034 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope);
7036 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage);
7037 NewVD->setInvalidDecl();
7041 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size);
7042 NewVD->setType(FixedTInfo->getType());
7043 NewVD->setTypeSourceInfo(FixedTInfo);
7046 if (T->isVoidType()) {
7047 // C++98 [dcl.stc]p5: The extern specifier can be applied only to the names
7048 // of objects and functions.
7049 if (NewVD->isThisDeclarationADefinition() || getLangOpts().CPlusPlus) {
7050 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type)
7052 NewVD->setInvalidDecl();
7057 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) {
7058 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal);
7059 NewVD->setInvalidDecl();
7063 if (isVM && NewVD->hasAttr<BlocksAttr>()) {
7064 Diag(NewVD->getLocation(), diag::err_block_on_vm);
7065 NewVD->setInvalidDecl();
7069 if (NewVD->isConstexpr() && !T->isDependentType() &&
7070 RequireLiteralType(NewVD->getLocation(), T,
7071 diag::err_constexpr_var_non_literal)) {
7072 NewVD->setInvalidDecl();
7077 /// \brief Perform semantic checking on a newly-created variable
7080 /// This routine performs all of the type-checking required for a
7081 /// variable declaration once it has been built. It is used both to
7082 /// check variables after they have been parsed and their declarators
7083 /// have been translated into a declaration, and to check variables
7084 /// that have been instantiated from a template.
7086 /// Sets NewVD->isInvalidDecl() if an error was encountered.
7088 /// Returns true if the variable declaration is a redeclaration.
7089 bool Sema::CheckVariableDeclaration(VarDecl *NewVD, LookupResult &Previous) {
7090 CheckVariableDeclarationType(NewVD);
7092 // If the decl is already known invalid, don't check it.
7093 if (NewVD->isInvalidDecl())
7096 // If we did not find anything by this name, look for a non-visible
7097 // extern "C" declaration with the same name.
7098 if (Previous.empty() &&
7099 checkForConflictWithNonVisibleExternC(*this, NewVD, Previous))
7100 Previous.setShadowed();
7102 if (!Previous.empty()) {
7103 MergeVarDecl(NewVD, Previous);
7110 struct FindOverriddenMethod {
7112 CXXMethodDecl *Method;
7114 /// Member lookup function that determines whether a given C++
7115 /// method overrides a method in a base class, to be used with
7116 /// CXXRecordDecl::lookupInBases().
7117 bool operator()(const CXXBaseSpecifier *Specifier, CXXBasePath &Path) {
7118 RecordDecl *BaseRecord =
7119 Specifier->getType()->getAs<RecordType>()->getDecl();
7121 DeclarationName Name = Method->getDeclName();
7123 // FIXME: Do we care about other names here too?
7124 if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
7125 // We really want to find the base class destructor here.
7126 QualType T = S->Context.getTypeDeclType(BaseRecord);
7127 CanQualType CT = S->Context.getCanonicalType(T);
7129 Name = S->Context.DeclarationNames.getCXXDestructorName(CT);
7132 for (Path.Decls = BaseRecord->lookup(Name); !Path.Decls.empty();
7133 Path.Decls = Path.Decls.slice(1)) {
7134 NamedDecl *D = Path.Decls.front();
7135 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
7136 if (MD->isVirtual() && !S->IsOverload(Method, MD, false))
7145 enum OverrideErrorKind { OEK_All, OEK_NonDeleted, OEK_Deleted };
7146 } // end anonymous namespace
7148 /// \brief Report an error regarding overriding, along with any relevant
7149 /// overriden methods.
7151 /// \param DiagID the primary error to report.
7152 /// \param MD the overriding method.
7153 /// \param OEK which overrides to include as notes.
7154 static void ReportOverrides(Sema& S, unsigned DiagID, const CXXMethodDecl *MD,
7155 OverrideErrorKind OEK = OEK_All) {
7156 S.Diag(MD->getLocation(), DiagID) << MD->getDeclName();
7157 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(),
7158 E = MD->end_overridden_methods();
7160 // This check (& the OEK parameter) could be replaced by a predicate, but
7161 // without lambdas that would be overkill. This is still nicer than writing
7162 // out the diag loop 3 times.
7163 if ((OEK == OEK_All) ||
7164 (OEK == OEK_NonDeleted && !(*I)->isDeleted()) ||
7165 (OEK == OEK_Deleted && (*I)->isDeleted()))
7166 S.Diag((*I)->getLocation(), diag::note_overridden_virtual_function);
7170 /// AddOverriddenMethods - See if a method overrides any in the base classes,
7171 /// and if so, check that it's a valid override and remember it.
7172 bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) {
7173 // Look for methods in base classes that this method might override.
7175 FindOverriddenMethod FOM;
7178 bool hasDeletedOverridenMethods = false;
7179 bool hasNonDeletedOverridenMethods = false;
7180 bool AddedAny = false;
7181 if (DC->lookupInBases(FOM, Paths)) {
7182 for (auto *I : Paths.found_decls()) {
7183 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(I)) {
7184 MD->addOverriddenMethod(OldMD->getCanonicalDecl());
7185 if (!CheckOverridingFunctionReturnType(MD, OldMD) &&
7186 !CheckOverridingFunctionAttributes(MD, OldMD) &&
7187 !CheckOverridingFunctionExceptionSpec(MD, OldMD) &&
7188 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) {
7189 hasDeletedOverridenMethods |= OldMD->isDeleted();
7190 hasNonDeletedOverridenMethods |= !OldMD->isDeleted();
7197 if (hasDeletedOverridenMethods && !MD->isDeleted()) {
7198 ReportOverrides(*this, diag::err_non_deleted_override, MD, OEK_Deleted);
7200 if (hasNonDeletedOverridenMethods && MD->isDeleted()) {
7201 ReportOverrides(*this, diag::err_deleted_override, MD, OEK_NonDeleted);
7208 // Struct for holding all of the extra arguments needed by
7209 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator.
7210 struct ActOnFDArgs {
7213 MultiTemplateParamsArg TemplateParamLists;
7216 } // end anonymous namespace
7220 // Callback to only accept typo corrections that have a non-zero edit distance.
7221 // Also only accept corrections that have the same parent decl.
7222 class DifferentNameValidatorCCC : public CorrectionCandidateCallback {
7224 DifferentNameValidatorCCC(ASTContext &Context, FunctionDecl *TypoFD,
7225 CXXRecordDecl *Parent)
7226 : Context(Context), OriginalFD(TypoFD),
7227 ExpectedParent(Parent ? Parent->getCanonicalDecl() : nullptr) {}
7229 bool ValidateCandidate(const TypoCorrection &candidate) override {
7230 if (candidate.getEditDistance() == 0)
7233 SmallVector<unsigned, 1> MismatchedParams;
7234 for (TypoCorrection::const_decl_iterator CDecl = candidate.begin(),
7235 CDeclEnd = candidate.end();
7236 CDecl != CDeclEnd; ++CDecl) {
7237 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl);
7239 if (FD && !FD->hasBody() &&
7240 hasSimilarParameters(Context, FD, OriginalFD, MismatchedParams)) {
7241 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
7242 CXXRecordDecl *Parent = MD->getParent();
7243 if (Parent && Parent->getCanonicalDecl() == ExpectedParent)
7245 } else if (!ExpectedParent) {
7255 ASTContext &Context;
7256 FunctionDecl *OriginalFD;
7257 CXXRecordDecl *ExpectedParent;
7260 } // end anonymous namespace
7262 /// \brief Generate diagnostics for an invalid function redeclaration.
7264 /// This routine handles generating the diagnostic messages for an invalid
7265 /// function redeclaration, including finding possible similar declarations
7266 /// or performing typo correction if there are no previous declarations with
7269 /// Returns a NamedDecl iff typo correction was performed and substituting in
7270 /// the new declaration name does not cause new errors.
7271 static NamedDecl *DiagnoseInvalidRedeclaration(
7272 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD,
7273 ActOnFDArgs &ExtraArgs, bool IsLocalFriend, Scope *S) {
7274 DeclarationName Name = NewFD->getDeclName();
7275 DeclContext *NewDC = NewFD->getDeclContext();
7276 SmallVector<unsigned, 1> MismatchedParams;
7277 SmallVector<std::pair<FunctionDecl *, unsigned>, 1> NearMatches;
7278 TypoCorrection Correction;
7279 bool IsDefinition = ExtraArgs.D.isFunctionDefinition();
7280 unsigned DiagMsg = IsLocalFriend ? diag::err_no_matching_local_friend
7281 : diag::err_member_decl_does_not_match;
7282 LookupResult Prev(SemaRef, Name, NewFD->getLocation(),
7283 IsLocalFriend ? Sema::LookupLocalFriendName
7284 : Sema::LookupOrdinaryName,
7285 Sema::ForRedeclaration);
7287 NewFD->setInvalidDecl();
7289 SemaRef.LookupName(Prev, S);
7291 SemaRef.LookupQualifiedName(Prev, NewDC);
7292 assert(!Prev.isAmbiguous() &&
7293 "Cannot have an ambiguity in previous-declaration lookup");
7294 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
7295 if (!Prev.empty()) {
7296 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end();
7297 Func != FuncEnd; ++Func) {
7298 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func);
7300 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) {
7301 // Add 1 to the index so that 0 can mean the mismatch didn't
7302 // involve a parameter
7304 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1;
7305 NearMatches.push_back(std::make_pair(FD, ParamNum));
7308 // If the qualified name lookup yielded nothing, try typo correction
7309 } else if ((Correction = SemaRef.CorrectTypo(
7310 Prev.getLookupNameInfo(), Prev.getLookupKind(), S,
7311 &ExtraArgs.D.getCXXScopeSpec(),
7312 llvm::make_unique<DifferentNameValidatorCCC>(
7313 SemaRef.Context, NewFD, MD ? MD->getParent() : nullptr),
7314 Sema::CTK_ErrorRecovery, IsLocalFriend ? nullptr : NewDC))) {
7315 // Set up everything for the call to ActOnFunctionDeclarator
7316 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(),
7317 ExtraArgs.D.getIdentifierLoc());
7319 Previous.setLookupName(Correction.getCorrection());
7320 for (TypoCorrection::decl_iterator CDecl = Correction.begin(),
7321 CDeclEnd = Correction.end();
7322 CDecl != CDeclEnd; ++CDecl) {
7323 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl);
7324 if (FD && !FD->hasBody() &&
7325 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) {
7326 Previous.addDecl(FD);
7329 bool wasRedeclaration = ExtraArgs.D.isRedeclaration();
7332 // Retry building the function declaration with the new previous
7333 // declarations, and with errors suppressed.
7336 Sema::SFINAETrap Trap(SemaRef);
7338 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the
7339 // pieces need to verify the typo-corrected C++ declaration and hopefully
7340 // eliminate the need for the parameter pack ExtraArgs.
7341 Result = SemaRef.ActOnFunctionDeclarator(
7342 ExtraArgs.S, ExtraArgs.D,
7343 Correction.getCorrectionDecl()->getDeclContext(),
7344 NewFD->getTypeSourceInfo(), Previous, ExtraArgs.TemplateParamLists,
7345 ExtraArgs.AddToScope);
7347 if (Trap.hasErrorOccurred())
7352 // Determine which correction we picked.
7353 Decl *Canonical = Result->getCanonicalDecl();
7354 for (LookupResult::iterator I = Previous.begin(), E = Previous.end();
7356 if ((*I)->getCanonicalDecl() == Canonical)
7357 Correction.setCorrectionDecl(*I);
7359 SemaRef.diagnoseTypo(
7361 SemaRef.PDiag(IsLocalFriend
7362 ? diag::err_no_matching_local_friend_suggest
7363 : diag::err_member_decl_does_not_match_suggest)
7364 << Name << NewDC << IsDefinition);
7368 // Pretend the typo correction never occurred
7369 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(),
7370 ExtraArgs.D.getIdentifierLoc());
7371 ExtraArgs.D.setRedeclaration(wasRedeclaration);
7373 Previous.setLookupName(Name);
7376 SemaRef.Diag(NewFD->getLocation(), DiagMsg)
7377 << Name << NewDC << IsDefinition << NewFD->getLocation();
7379 bool NewFDisConst = false;
7380 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD))
7381 NewFDisConst = NewMD->isConst();
7383 for (SmallVectorImpl<std::pair<FunctionDecl *, unsigned> >::iterator
7384 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end();
7385 NearMatch != NearMatchEnd; ++NearMatch) {
7386 FunctionDecl *FD = NearMatch->first;
7387 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD);
7388 bool FDisConst = MD && MD->isConst();
7389 bool IsMember = MD || !IsLocalFriend;
7391 // FIXME: These notes are poorly worded for the local friend case.
7392 if (unsigned Idx = NearMatch->second) {
7393 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1);
7394 SourceLocation Loc = FDParam->getTypeSpecStartLoc();
7395 if (Loc.isInvalid()) Loc = FD->getLocation();
7396 SemaRef.Diag(Loc, IsMember ? diag::note_member_def_close_param_match
7397 : diag::note_local_decl_close_param_match)
7398 << Idx << FDParam->getType()
7399 << NewFD->getParamDecl(Idx - 1)->getType();
7400 } else if (FDisConst != NewFDisConst) {
7401 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match)
7402 << NewFDisConst << FD->getSourceRange().getEnd();
7404 SemaRef.Diag(FD->getLocation(),
7405 IsMember ? diag::note_member_def_close_match
7406 : diag::note_local_decl_close_match);
7411 static StorageClass getFunctionStorageClass(Sema &SemaRef, Declarator &D) {
7412 switch (D.getDeclSpec().getStorageClassSpec()) {
7413 default: llvm_unreachable("Unknown storage class!");
7414 case DeclSpec::SCS_auto:
7415 case DeclSpec::SCS_register:
7416 case DeclSpec::SCS_mutable:
7417 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(),
7418 diag::err_typecheck_sclass_func);
7421 case DeclSpec::SCS_unspecified: break;
7422 case DeclSpec::SCS_extern:
7423 if (D.getDeclSpec().isExternInLinkageSpec())
7426 case DeclSpec::SCS_static: {
7427 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) {
7429 // The declaration of an identifier for a function that has
7430 // block scope shall have no explicit storage-class specifier
7431 // other than extern
7432 // See also (C++ [dcl.stc]p4).
7433 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(),
7434 diag::err_static_block_func);
7439 case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
7442 // No explicit storage class has already been returned
7446 static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D,
7447 DeclContext *DC, QualType &R,
7448 TypeSourceInfo *TInfo,
7450 bool &IsVirtualOkay) {
7451 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D);
7452 DeclarationName Name = NameInfo.getName();
7454 FunctionDecl *NewFD = nullptr;
7455 bool isInline = D.getDeclSpec().isInlineSpecified();
7457 if (!SemaRef.getLangOpts().CPlusPlus) {
7458 // Determine whether the function was written with a
7459 // prototype. This true when:
7460 // - there is a prototype in the declarator, or
7461 // - the type R of the function is some kind of typedef or other reference
7462 // to a type name (which eventually refers to a function type).
7464 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) ||
7465 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType());
7467 NewFD = FunctionDecl::Create(SemaRef.Context, DC,
7468 D.getLocStart(), NameInfo, R,
7469 TInfo, SC, isInline,
7470 HasPrototype, false);
7471 if (D.isInvalidType())
7472 NewFD->setInvalidDecl();
7477 bool isExplicit = D.getDeclSpec().isExplicitSpecified();
7478 bool isConstexpr = D.getDeclSpec().isConstexprSpecified();
7480 // Check that the return type is not an abstract class type.
7481 // For record types, this is done by the AbstractClassUsageDiagnoser once
7482 // the class has been completely parsed.
7483 if (!DC->isRecord() &&
7484 SemaRef.RequireNonAbstractType(
7485 D.getIdentifierLoc(), R->getAs<FunctionType>()->getReturnType(),
7486 diag::err_abstract_type_in_decl, SemaRef.AbstractReturnType))
7489 if (Name.getNameKind() == DeclarationName::CXXConstructorName) {
7490 // This is a C++ constructor declaration.
7491 assert(DC->isRecord() &&
7492 "Constructors can only be declared in a member context");
7494 R = SemaRef.CheckConstructorDeclarator(D, R, SC);
7495 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC),
7496 D.getLocStart(), NameInfo,
7497 R, TInfo, isExplicit, isInline,
7498 /*isImplicitlyDeclared=*/false,
7501 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
7502 // This is a C++ destructor declaration.
7503 if (DC->isRecord()) {
7504 R = SemaRef.CheckDestructorDeclarator(D, R, SC);
7505 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC);
7506 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(
7507 SemaRef.Context, Record,
7509 NameInfo, R, TInfo, isInline,
7510 /*isImplicitlyDeclared=*/false);
7512 // If the class is complete, then we now create the implicit exception
7513 // specification. If the class is incomplete or dependent, we can't do
7515 if (SemaRef.getLangOpts().CPlusPlus11 && !Record->isDependentType() &&
7516 Record->getDefinition() && !Record->isBeingDefined() &&
7517 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) {
7518 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD);
7521 IsVirtualOkay = true;
7525 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member);
7528 // Create a FunctionDecl to satisfy the function definition parsing
7530 return FunctionDecl::Create(SemaRef.Context, DC,
7532 D.getIdentifierLoc(), Name, R, TInfo,
7534 /*hasPrototype=*/true, isConstexpr);
7537 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
7538 if (!DC->isRecord()) {
7539 SemaRef.Diag(D.getIdentifierLoc(),
7540 diag::err_conv_function_not_member);
7544 SemaRef.CheckConversionDeclarator(D, R, SC);
7545 IsVirtualOkay = true;
7546 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC),
7547 D.getLocStart(), NameInfo,
7548 R, TInfo, isInline, isExplicit,
7549 isConstexpr, SourceLocation());
7551 } else if (DC->isRecord()) {
7552 // If the name of the function is the same as the name of the record,
7553 // then this must be an invalid constructor that has a return type.
7554 // (The parser checks for a return type and makes the declarator a
7555 // constructor if it has no return type).
7556 if (Name.getAsIdentifierInfo() &&
7557 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){
7558 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type)
7559 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
7560 << SourceRange(D.getIdentifierLoc());
7564 // This is a C++ method declaration.
7565 CXXMethodDecl *Ret = CXXMethodDecl::Create(SemaRef.Context,
7566 cast<CXXRecordDecl>(DC),
7567 D.getLocStart(), NameInfo, R,
7568 TInfo, SC, isInline,
7569 isConstexpr, SourceLocation());
7570 IsVirtualOkay = !Ret->isStatic();
7574 SemaRef.getLangOpts().CPlusPlus && D.getDeclSpec().isFriendSpecified();
7575 if (!isFriend && SemaRef.CurContext->isRecord())
7578 // Determine whether the function was written with a
7579 // prototype. This true when:
7580 // - we're in C++ (where every function has a prototype),
7581 return FunctionDecl::Create(SemaRef.Context, DC,
7583 NameInfo, R, TInfo, SC, isInline,
7584 true/*HasPrototype*/, isConstexpr);
7588 enum OpenCLParamType {
7592 InvalidAddrSpacePtrKernelParam,
7597 static OpenCLParamType getOpenCLKernelParameterType(Sema &S, QualType PT) {
7598 if (PT->isPointerType()) {
7599 QualType PointeeType = PT->getPointeeType();
7600 if (PointeeType->isPointerType())
7601 return PtrPtrKernelParam;
7602 if (PointeeType.getAddressSpace() == LangAS::opencl_generic ||
7603 PointeeType.getAddressSpace() == 0)
7604 return InvalidAddrSpacePtrKernelParam;
7605 return PtrKernelParam;
7608 // TODO: Forbid the other integer types (size_t, ptrdiff_t...) when they can
7609 // be used as builtin types.
7611 if (PT->isImageType())
7612 return PtrKernelParam;
7614 if (PT->isBooleanType())
7615 return InvalidKernelParam;
7618 return InvalidKernelParam;
7620 // OpenCL extension spec v1.2 s9.5:
7621 // This extension adds support for half scalar and vector types as built-in
7622 // types that can be used for arithmetic operations, conversions etc.
7623 if (!S.getOpenCLOptions().isEnabled("cl_khr_fp16") && PT->isHalfType())
7624 return InvalidKernelParam;
7626 if (PT->isRecordType())
7627 return RecordKernelParam;
7629 return ValidKernelParam;
7632 static void checkIsValidOpenCLKernelParameter(
7636 llvm::SmallPtrSetImpl<const Type *> &ValidTypes) {
7637 QualType PT = Param->getType();
7639 // Cache the valid types we encounter to avoid rechecking structs that are
7641 if (ValidTypes.count(PT.getTypePtr()))
7644 switch (getOpenCLKernelParameterType(S, PT)) {
7645 case PtrPtrKernelParam:
7646 // OpenCL v1.2 s6.9.a:
7647 // A kernel function argument cannot be declared as a
7648 // pointer to a pointer type.
7649 S.Diag(Param->getLocation(), diag::err_opencl_ptrptr_kernel_param);
7653 case InvalidAddrSpacePtrKernelParam:
7654 // OpenCL v1.0 s6.5:
7655 // __kernel function arguments declared to be a pointer of a type can point
7656 // to one of the following address spaces only : __global, __local or
7658 S.Diag(Param->getLocation(), diag::err_kernel_arg_address_space);
7662 // OpenCL v1.2 s6.9.k:
7663 // Arguments to kernel functions in a program cannot be declared with the
7664 // built-in scalar types bool, half, size_t, ptrdiff_t, intptr_t, and
7665 // uintptr_t or a struct and/or union that contain fields declared to be
7666 // one of these built-in scalar types.
7668 case InvalidKernelParam:
7669 // OpenCL v1.2 s6.8 n:
7670 // A kernel function argument cannot be declared
7672 // Do not diagnose half type since it is diagnosed as invalid argument
7673 // type for any function elsewhere.
7674 if (!PT->isHalfType())
7675 S.Diag(Param->getLocation(), diag::err_bad_kernel_param_type) << PT;
7679 case PtrKernelParam:
7680 case ValidKernelParam:
7681 ValidTypes.insert(PT.getTypePtr());
7684 case RecordKernelParam:
7688 // Track nested structs we will inspect
7689 SmallVector<const Decl *, 4> VisitStack;
7691 // Track where we are in the nested structs. Items will migrate from
7692 // VisitStack to HistoryStack as we do the DFS for bad field.
7693 SmallVector<const FieldDecl *, 4> HistoryStack;
7694 HistoryStack.push_back(nullptr);
7696 const RecordDecl *PD = PT->castAs<RecordType>()->getDecl();
7697 VisitStack.push_back(PD);
7699 assert(VisitStack.back() && "First decl null?");
7702 const Decl *Next = VisitStack.pop_back_val();
7704 assert(!HistoryStack.empty());
7705 // Found a marker, we have gone up a level
7706 if (const FieldDecl *Hist = HistoryStack.pop_back_val())
7707 ValidTypes.insert(Hist->getType().getTypePtr());
7712 // Adds everything except the original parameter declaration (which is not a
7713 // field itself) to the history stack.
7714 const RecordDecl *RD;
7715 if (const FieldDecl *Field = dyn_cast<FieldDecl>(Next)) {
7716 HistoryStack.push_back(Field);
7717 RD = Field->getType()->castAs<RecordType>()->getDecl();
7719 RD = cast<RecordDecl>(Next);
7722 // Add a null marker so we know when we've gone back up a level
7723 VisitStack.push_back(nullptr);
7725 for (const auto *FD : RD->fields()) {
7726 QualType QT = FD->getType();
7728 if (ValidTypes.count(QT.getTypePtr()))
7731 OpenCLParamType ParamType = getOpenCLKernelParameterType(S, QT);
7732 if (ParamType == ValidKernelParam)
7735 if (ParamType == RecordKernelParam) {
7736 VisitStack.push_back(FD);
7740 // OpenCL v1.2 s6.9.p:
7741 // Arguments to kernel functions that are declared to be a struct or union
7742 // do not allow OpenCL objects to be passed as elements of the struct or
7744 if (ParamType == PtrKernelParam || ParamType == PtrPtrKernelParam ||
7745 ParamType == InvalidAddrSpacePtrKernelParam) {
7746 S.Diag(Param->getLocation(),
7747 diag::err_record_with_pointers_kernel_param)
7748 << PT->isUnionType()
7751 S.Diag(Param->getLocation(), diag::err_bad_kernel_param_type) << PT;
7754 S.Diag(PD->getLocation(), diag::note_within_field_of_type)
7755 << PD->getDeclName();
7757 // We have an error, now let's go back up through history and show where
7758 // the offending field came from
7759 for (ArrayRef<const FieldDecl *>::const_iterator
7760 I = HistoryStack.begin() + 1,
7761 E = HistoryStack.end();
7763 const FieldDecl *OuterField = *I;
7764 S.Diag(OuterField->getLocation(), diag::note_within_field_of_type)
7765 << OuterField->getType();
7768 S.Diag(FD->getLocation(), diag::note_illegal_field_declared_here)
7769 << QT->isPointerType()
7774 } while (!VisitStack.empty());
7777 /// Find the DeclContext in which a tag is implicitly declared if we see an
7778 /// elaborated type specifier in the specified context, and lookup finds
7780 static DeclContext *getTagInjectionContext(DeclContext *DC) {
7781 while (!DC->isFileContext() && !DC->isFunctionOrMethod())
7782 DC = DC->getParent();
7786 /// Find the Scope in which a tag is implicitly declared if we see an
7787 /// elaborated type specifier in the specified context, and lookup finds
7789 static Scope *getTagInjectionScope(Scope *S, const LangOptions &LangOpts) {
7790 while (S->isClassScope() ||
7791 (LangOpts.CPlusPlus &&
7792 S->isFunctionPrototypeScope()) ||
7793 ((S->getFlags() & Scope::DeclScope) == 0) ||
7794 (S->getEntity() && S->getEntity()->isTransparentContext()))
7800 Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC,
7801 TypeSourceInfo *TInfo, LookupResult &Previous,
7802 MultiTemplateParamsArg TemplateParamLists,
7804 QualType R = TInfo->getType();
7806 assert(R.getTypePtr()->isFunctionType());
7808 // TODO: consider using NameInfo for diagnostic.
7809 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
7810 DeclarationName Name = NameInfo.getName();
7811 StorageClass SC = getFunctionStorageClass(*this, D);
7813 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec())
7814 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(),
7815 diag::err_invalid_thread)
7816 << DeclSpec::getSpecifierName(TSCS);
7818 if (D.isFirstDeclarationOfMember())
7819 adjustMemberFunctionCC(R, D.isStaticMember(), D.isCtorOrDtor(),
7820 D.getIdentifierLoc());
7822 bool isFriend = false;
7823 FunctionTemplateDecl *FunctionTemplate = nullptr;
7824 bool isExplicitSpecialization = false;
7825 bool isFunctionTemplateSpecialization = false;
7827 bool isDependentClassScopeExplicitSpecialization = false;
7828 bool HasExplicitTemplateArgs = false;
7829 TemplateArgumentListInfo TemplateArgs;
7831 bool isVirtualOkay = false;
7833 DeclContext *OriginalDC = DC;
7834 bool IsLocalExternDecl = adjustContextForLocalExternDecl(DC);
7836 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC,
7838 if (!NewFD) return nullptr;
7840 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer())
7841 NewFD->setTopLevelDeclInObjCContainer();
7843 // Set the lexical context. If this is a function-scope declaration, or has a
7844 // C++ scope specifier, or is the object of a friend declaration, the lexical
7845 // context will be different from the semantic context.
7846 NewFD->setLexicalDeclContext(CurContext);
7848 if (IsLocalExternDecl)
7849 NewFD->setLocalExternDecl();
7851 if (getLangOpts().CPlusPlus) {
7852 bool isInline = D.getDeclSpec().isInlineSpecified();
7853 bool isVirtual = D.getDeclSpec().isVirtualSpecified();
7854 bool isExplicit = D.getDeclSpec().isExplicitSpecified();
7855 bool isConstexpr = D.getDeclSpec().isConstexprSpecified();
7856 bool isConcept = D.getDeclSpec().isConceptSpecified();
7857 isFriend = D.getDeclSpec().isFriendSpecified();
7858 if (isFriend && !isInline && D.isFunctionDefinition()) {
7859 // C++ [class.friend]p5
7860 // A function can be defined in a friend declaration of a
7861 // class . . . . Such a function is implicitly inline.
7862 NewFD->setImplicitlyInline();
7865 // If this is a method defined in an __interface, and is not a constructor
7866 // or an overloaded operator, then set the pure flag (isVirtual will already
7868 if (const CXXRecordDecl *Parent =
7869 dyn_cast<CXXRecordDecl>(NewFD->getDeclContext())) {
7870 if (Parent->isInterface() && cast<CXXMethodDecl>(NewFD)->isUserProvided())
7871 NewFD->setPure(true);
7873 // C++ [class.union]p2
7874 // A union can have member functions, but not virtual functions.
7875 if (isVirtual && Parent->isUnion())
7876 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_in_union);
7879 SetNestedNameSpecifier(NewFD, D);
7880 isExplicitSpecialization = false;
7881 isFunctionTemplateSpecialization = false;
7882 if (D.isInvalidType())
7883 NewFD->setInvalidDecl();
7885 // Match up the template parameter lists with the scope specifier, then
7886 // determine whether we have a template or a template specialization.
7887 bool Invalid = false;
7888 if (TemplateParameterList *TemplateParams =
7889 MatchTemplateParametersToScopeSpecifier(
7890 D.getDeclSpec().getLocStart(), D.getIdentifierLoc(),
7891 D.getCXXScopeSpec(),
7892 D.getName().getKind() == UnqualifiedId::IK_TemplateId
7893 ? D.getName().TemplateId
7895 TemplateParamLists, isFriend, isExplicitSpecialization,
7897 if (TemplateParams->size() > 0) {
7898 // This is a function template
7900 // Check that we can declare a template here.
7901 if (CheckTemplateDeclScope(S, TemplateParams))
7902 NewFD->setInvalidDecl();
7904 // A destructor cannot be a template.
7905 if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
7906 Diag(NewFD->getLocation(), diag::err_destructor_template);
7907 NewFD->setInvalidDecl();
7910 // If we're adding a template to a dependent context, we may need to
7911 // rebuilding some of the types used within the template parameter list,
7912 // now that we know what the current instantiation is.
7913 if (DC->isDependentContext()) {
7914 ContextRAII SavedContext(*this, DC);
7915 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams))
7919 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC,
7920 NewFD->getLocation(),
7921 Name, TemplateParams,
7923 FunctionTemplate->setLexicalDeclContext(CurContext);
7924 NewFD->setDescribedFunctionTemplate(FunctionTemplate);
7926 // For source fidelity, store the other template param lists.
7927 if (TemplateParamLists.size() > 1) {
7928 NewFD->setTemplateParameterListsInfo(Context,
7929 TemplateParamLists.drop_back(1));
7932 // This is a function template specialization.
7933 isFunctionTemplateSpecialization = true;
7934 // For source fidelity, store all the template param lists.
7935 if (TemplateParamLists.size() > 0)
7936 NewFD->setTemplateParameterListsInfo(Context, TemplateParamLists);
7938 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);".
7940 // We want to remove the "template<>", found here.
7941 SourceRange RemoveRange = TemplateParams->getSourceRange();
7943 // If we remove the template<> and the name is not a
7944 // template-id, we're actually silently creating a problem:
7945 // the friend declaration will refer to an untemplated decl,
7946 // and clearly the user wants a template specialization. So
7947 // we need to insert '<>' after the name.
7948 SourceLocation InsertLoc;
7949 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) {
7950 InsertLoc = D.getName().getSourceRange().getEnd();
7951 InsertLoc = getLocForEndOfToken(InsertLoc);
7954 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend)
7955 << Name << RemoveRange
7956 << FixItHint::CreateRemoval(RemoveRange)
7957 << FixItHint::CreateInsertion(InsertLoc, "<>");
7962 // All template param lists were matched against the scope specifier:
7963 // this is NOT (an explicit specialization of) a template.
7964 if (TemplateParamLists.size() > 0)
7965 // For source fidelity, store all the template param lists.
7966 NewFD->setTemplateParameterListsInfo(Context, TemplateParamLists);
7970 NewFD->setInvalidDecl();
7971 if (FunctionTemplate)
7972 FunctionTemplate->setInvalidDecl();
7975 // C++ [dcl.fct.spec]p5:
7976 // The virtual specifier shall only be used in declarations of
7977 // nonstatic class member functions that appear within a
7978 // member-specification of a class declaration; see 10.3.
7980 if (isVirtual && !NewFD->isInvalidDecl()) {
7981 if (!isVirtualOkay) {
7982 Diag(D.getDeclSpec().getVirtualSpecLoc(),
7983 diag::err_virtual_non_function);
7984 } else if (!CurContext->isRecord()) {
7985 // 'virtual' was specified outside of the class.
7986 Diag(D.getDeclSpec().getVirtualSpecLoc(),
7987 diag::err_virtual_out_of_class)
7988 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc());
7989 } else if (NewFD->getDescribedFunctionTemplate()) {
7990 // C++ [temp.mem]p3:
7991 // A member function template shall not be virtual.
7992 Diag(D.getDeclSpec().getVirtualSpecLoc(),
7993 diag::err_virtual_member_function_template)
7994 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc());
7996 // Okay: Add virtual to the method.
7997 NewFD->setVirtualAsWritten(true);
8000 if (getLangOpts().CPlusPlus14 &&
8001 NewFD->getReturnType()->isUndeducedType())
8002 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_auto_fn_virtual);
8005 if (getLangOpts().CPlusPlus14 &&
8006 (NewFD->isDependentContext() ||
8007 (isFriend && CurContext->isDependentContext())) &&
8008 NewFD->getReturnType()->isUndeducedType()) {
8009 // If the function template is referenced directly (for instance, as a
8010 // member of the current instantiation), pretend it has a dependent type.
8011 // This is not really justified by the standard, but is the only sane
8013 // FIXME: For a friend function, we have not marked the function as being
8014 // a friend yet, so 'isDependentContext' on the FD doesn't work.
8015 const FunctionProtoType *FPT =
8016 NewFD->getType()->castAs<FunctionProtoType>();
8018 SubstAutoType(FPT->getReturnType(), Context.DependentTy);
8019 NewFD->setType(Context.getFunctionType(Result, FPT->getParamTypes(),
8020 FPT->getExtProtoInfo()));
8023 // C++ [dcl.fct.spec]p3:
8024 // The inline specifier shall not appear on a block scope function
8026 if (isInline && !NewFD->isInvalidDecl()) {
8027 if (CurContext->isFunctionOrMethod()) {
8028 // 'inline' is not allowed on block scope function declaration.
8029 Diag(D.getDeclSpec().getInlineSpecLoc(),
8030 diag::err_inline_declaration_block_scope) << Name
8031 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc());
8035 // C++ [dcl.fct.spec]p6:
8036 // The explicit specifier shall be used only in the declaration of a
8037 // constructor or conversion function within its class definition;
8038 // see 12.3.1 and 12.3.2.
8039 if (isExplicit && !NewFD->isInvalidDecl()) {
8040 if (!CurContext->isRecord()) {
8041 // 'explicit' was specified outside of the class.
8042 Diag(D.getDeclSpec().getExplicitSpecLoc(),
8043 diag::err_explicit_out_of_class)
8044 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
8045 } else if (!isa<CXXConstructorDecl>(NewFD) &&
8046 !isa<CXXConversionDecl>(NewFD)) {
8047 // 'explicit' was specified on a function that wasn't a constructor
8048 // or conversion function.
8049 Diag(D.getDeclSpec().getExplicitSpecLoc(),
8050 diag::err_explicit_non_ctor_or_conv_function)
8051 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
8056 // C++11 [dcl.constexpr]p2: constexpr functions and constexpr constructors
8057 // are implicitly inline.
8058 NewFD->setImplicitlyInline();
8060 // C++11 [dcl.constexpr]p3: functions declared constexpr are required to
8061 // be either constructors or to return a literal type. Therefore,
8062 // destructors cannot be declared constexpr.
8063 if (isa<CXXDestructorDecl>(NewFD))
8064 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor);
8068 // This is a function concept.
8069 if (FunctionTemplateDecl *FTD = NewFD->getDescribedFunctionTemplate())
8072 // C++ Concepts TS [dcl.spec.concept]p1: The concept specifier shall be
8073 // applied only to the definition of a function template [...]
8074 if (!D.isFunctionDefinition()) {
8075 Diag(D.getDeclSpec().getConceptSpecLoc(),
8076 diag::err_function_concept_not_defined);
8077 NewFD->setInvalidDecl();
8080 // C++ Concepts TS [dcl.spec.concept]p1: [...] A function concept shall
8081 // have no exception-specification and is treated as if it were specified
8082 // with noexcept(true) (15.4). [...]
8083 if (const FunctionProtoType *FPT = R->getAs<FunctionProtoType>()) {
8084 if (FPT->hasExceptionSpec()) {
8086 if (D.isFunctionDeclarator())
8087 Range = D.getFunctionTypeInfo().getExceptionSpecRange();
8088 Diag(NewFD->getLocation(), diag::err_function_concept_exception_spec)
8089 << FixItHint::CreateRemoval(Range);
8090 NewFD->setInvalidDecl();
8092 Context.adjustExceptionSpec(NewFD, EST_BasicNoexcept);
8095 // C++ Concepts TS [dcl.spec.concept]p5: A function concept has the
8096 // following restrictions:
8097 // - The declared return type shall have the type bool.
8098 if (!Context.hasSameType(FPT->getReturnType(), Context.BoolTy)) {
8099 Diag(D.getIdentifierLoc(), diag::err_function_concept_bool_ret);
8100 NewFD->setInvalidDecl();
8103 // C++ Concepts TS [dcl.spec.concept]p5: A function concept has the
8104 // following restrictions:
8105 // - The declaration's parameter list shall be equivalent to an empty
8107 if (FPT->getNumParams() > 0 || FPT->isVariadic())
8108 Diag(NewFD->getLocation(), diag::err_function_concept_with_params);
8111 // C++ Concepts TS [dcl.spec.concept]p2: Every concept definition is
8112 // implicity defined to be a constexpr declaration (implicitly inline)
8113 NewFD->setImplicitlyInline();
8115 // C++ Concepts TS [dcl.spec.concept]p2: A concept definition shall not
8116 // be declared with the thread_local, inline, friend, or constexpr
8117 // specifiers, [...]
8119 Diag(D.getDeclSpec().getInlineSpecLoc(),
8120 diag::err_concept_decl_invalid_specifiers)
8122 NewFD->setInvalidDecl(true);
8126 Diag(D.getDeclSpec().getFriendSpecLoc(),
8127 diag::err_concept_decl_invalid_specifiers)
8129 NewFD->setInvalidDecl(true);
8133 Diag(D.getDeclSpec().getConstexprSpecLoc(),
8134 diag::err_concept_decl_invalid_specifiers)
8136 NewFD->setInvalidDecl(true);
8139 // C++ Concepts TS [dcl.spec.concept]p1: The concept specifier shall be
8140 // applied only to the definition of a function template or variable
8141 // template, declared in namespace scope.
8142 if (isFunctionTemplateSpecialization) {
8143 Diag(D.getDeclSpec().getConceptSpecLoc(),
8144 diag::err_concept_specified_specialization) << 1;
8145 NewFD->setInvalidDecl(true);
8150 // If __module_private__ was specified, mark the function accordingly.
8151 if (D.getDeclSpec().isModulePrivateSpecified()) {
8152 if (isFunctionTemplateSpecialization) {
8153 SourceLocation ModulePrivateLoc
8154 = D.getDeclSpec().getModulePrivateSpecLoc();
8155 Diag(ModulePrivateLoc, diag::err_module_private_specialization)
8157 << FixItHint::CreateRemoval(ModulePrivateLoc);
8159 NewFD->setModulePrivate();
8160 if (FunctionTemplate)
8161 FunctionTemplate->setModulePrivate();
8166 if (FunctionTemplate) {
8167 FunctionTemplate->setObjectOfFriendDecl();
8168 FunctionTemplate->setAccess(AS_public);
8170 NewFD->setObjectOfFriendDecl();
8171 NewFD->setAccess(AS_public);
8174 // If a function is defined as defaulted or deleted, mark it as such now.
8175 // FIXME: Does this ever happen? ActOnStartOfFunctionDef forces the function
8176 // definition kind to FDK_Definition.
8177 switch (D.getFunctionDefinitionKind()) {
8178 case FDK_Declaration:
8179 case FDK_Definition:
8183 NewFD->setDefaulted();
8187 NewFD->setDeletedAsWritten();
8191 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext &&
8192 D.isFunctionDefinition()) {
8193 // C++ [class.mfct]p2:
8194 // A member function may be defined (8.4) in its class definition, in
8195 // which case it is an inline member function (7.1.2)
8196 NewFD->setImplicitlyInline();
8199 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) &&
8200 !CurContext->isRecord()) {
8201 // C++ [class.static]p1:
8202 // A data or function member of a class may be declared static
8203 // in a class definition, in which case it is a static member of
8206 // Complain about the 'static' specifier if it's on an out-of-line
8207 // member function definition.
8208 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
8209 diag::err_static_out_of_line)
8210 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
8213 // C++11 [except.spec]p15:
8214 // A deallocation function with no exception-specification is treated
8215 // as if it were specified with noexcept(true).
8216 const FunctionProtoType *FPT = R->getAs<FunctionProtoType>();
8217 if ((Name.getCXXOverloadedOperator() == OO_Delete ||
8218 Name.getCXXOverloadedOperator() == OO_Array_Delete) &&
8219 getLangOpts().CPlusPlus11 && FPT && !FPT->hasExceptionSpec())
8220 NewFD->setType(Context.getFunctionType(
8221 FPT->getReturnType(), FPT->getParamTypes(),
8222 FPT->getExtProtoInfo().withExceptionSpec(EST_BasicNoexcept)));
8225 // Filter out previous declarations that don't match the scope.
8226 FilterLookupForScope(Previous, OriginalDC, S, shouldConsiderLinkage(NewFD),
8227 D.getCXXScopeSpec().isNotEmpty() ||
8228 isExplicitSpecialization ||
8229 isFunctionTemplateSpecialization);
8231 // Handle GNU asm-label extension (encoded as an attribute).
8232 if (Expr *E = (Expr*) D.getAsmLabel()) {
8233 // The parser guarantees this is a string.
8234 StringLiteral *SE = cast<StringLiteral>(E);
8235 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context,
8236 SE->getString(), 0));
8237 } else if (!ExtnameUndeclaredIdentifiers.empty()) {
8238 llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I =
8239 ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier());
8240 if (I != ExtnameUndeclaredIdentifiers.end()) {
8241 if (isDeclExternC(NewFD)) {
8242 NewFD->addAttr(I->second);
8243 ExtnameUndeclaredIdentifiers.erase(I);
8245 Diag(NewFD->getLocation(), diag::warn_redefine_extname_not_applied)
8246 << /*Variable*/0 << NewFD;
8250 // Copy the parameter declarations from the declarator D to the function
8251 // declaration NewFD, if they are available. First scavenge them into Params.
8252 SmallVector<ParmVarDecl*, 16> Params;
8254 if (D.isFunctionDeclarator(FTIIdx)) {
8255 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(FTIIdx).Fun;
8257 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs
8258 // function that takes no arguments, not a function that takes a
8259 // single void argument.
8260 // We let through "const void" here because Sema::GetTypeForDeclarator
8261 // already checks for that case.
8262 if (FTIHasNonVoidParameters(FTI) && FTI.Params[0].Param) {
8263 for (unsigned i = 0, e = FTI.NumParams; i != e; ++i) {
8264 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param);
8265 assert(Param->getDeclContext() != NewFD && "Was set before ?");
8266 Param->setDeclContext(NewFD);
8267 Params.push_back(Param);
8269 if (Param->isInvalidDecl())
8270 NewFD->setInvalidDecl();
8274 if (!getLangOpts().CPlusPlus) {
8275 // In C, find all the tag declarations from the prototype and move them
8276 // into the function DeclContext. Remove them from the surrounding tag
8277 // injection context of the function, which is typically but not always
8279 DeclContext *PrototypeTagContext =
8280 getTagInjectionContext(NewFD->getLexicalDeclContext());
8281 for (NamedDecl *NonParmDecl : FTI.getDeclsInPrototype()) {
8282 auto *TD = dyn_cast<TagDecl>(NonParmDecl);
8284 // We don't want to reparent enumerators. Look at their parent enum
8287 if (auto *ECD = dyn_cast<EnumConstantDecl>(NonParmDecl))
8288 TD = cast<EnumDecl>(ECD->getDeclContext());
8292 DeclContext *TagDC = TD->getLexicalDeclContext();
8293 if (!TagDC->containsDecl(TD))
8295 TagDC->removeDecl(TD);
8296 TD->setDeclContext(NewFD);
8299 // Preserve the lexical DeclContext if it is not the surrounding tag
8300 // injection context of the FD. In this example, the semantic context of
8301 // E will be f and the lexical context will be S, while both the
8302 // semantic and lexical contexts of S will be f:
8303 // void f(struct S { enum E { a } f; } s);
8304 if (TagDC != PrototypeTagContext)
8305 TD->setLexicalDeclContext(TagDC);
8308 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) {
8309 // When we're declaring a function with a typedef, typeof, etc as in the
8310 // following example, we'll need to synthesize (unnamed)
8311 // parameters for use in the declaration.
8314 // typedef void fn(int);
8318 // Synthesize a parameter for each argument type.
8319 for (const auto &AI : FT->param_types()) {
8320 ParmVarDecl *Param =
8321 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), AI);
8322 Param->setScopeInfo(0, Params.size());
8323 Params.push_back(Param);
8326 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 &&
8327 "Should not need args for typedef of non-prototype fn");
8330 // Finally, we know we have the right number of parameters, install them.
8331 NewFD->setParams(Params);
8333 if (D.getDeclSpec().isNoreturnSpecified())
8335 ::new(Context) C11NoReturnAttr(D.getDeclSpec().getNoreturnSpecLoc(),
8338 // Functions returning a variably modified type violate C99 6.7.5.2p2
8339 // because all functions have linkage.
8340 if (!NewFD->isInvalidDecl() &&
8341 NewFD->getReturnType()->isVariablyModifiedType()) {
8342 Diag(NewFD->getLocation(), diag::err_vm_func_decl);
8343 NewFD->setInvalidDecl();
8346 // Apply an implicit SectionAttr if #pragma code_seg is active.
8347 if (CodeSegStack.CurrentValue && D.isFunctionDefinition() &&
8348 !NewFD->hasAttr<SectionAttr>()) {
8350 SectionAttr::CreateImplicit(Context, SectionAttr::Declspec_allocate,
8351 CodeSegStack.CurrentValue->getString(),
8352 CodeSegStack.CurrentPragmaLocation));
8353 if (UnifySection(CodeSegStack.CurrentValue->getString(),
8354 ASTContext::PSF_Implicit | ASTContext::PSF_Execute |
8355 ASTContext::PSF_Read,
8357 NewFD->dropAttr<SectionAttr>();
8360 // Handle attributes.
8361 ProcessDeclAttributes(S, NewFD, D);
8363 if (getLangOpts().OpenCL) {
8364 // OpenCL v1.1 s6.5: Using an address space qualifier in a function return
8365 // type declaration will generate a compilation error.
8366 unsigned AddressSpace = NewFD->getReturnType().getAddressSpace();
8367 if (AddressSpace == LangAS::opencl_local ||
8368 AddressSpace == LangAS::opencl_global ||
8369 AddressSpace == LangAS::opencl_constant) {
8370 Diag(NewFD->getLocation(),
8371 diag::err_opencl_return_value_with_address_space);
8372 NewFD->setInvalidDecl();
8376 if (!getLangOpts().CPlusPlus) {
8377 // Perform semantic checking on the function declaration.
8378 bool isExplicitSpecialization=false;
8379 if (!NewFD->isInvalidDecl() && NewFD->isMain())
8380 CheckMain(NewFD, D.getDeclSpec());
8382 if (!NewFD->isInvalidDecl() && NewFD->isMSVCRTEntryPoint())
8383 CheckMSVCRTEntryPoint(NewFD);
8385 if (!NewFD->isInvalidDecl())
8386 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous,
8387 isExplicitSpecialization));
8388 else if (!Previous.empty())
8389 // Recover gracefully from an invalid redeclaration.
8390 D.setRedeclaration(true);
8391 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() ||
8392 Previous.getResultKind() != LookupResult::FoundOverloaded) &&
8393 "previous declaration set still overloaded");
8395 // Diagnose no-prototype function declarations with calling conventions that
8396 // don't support variadic calls. Only do this in C and do it after merging
8397 // possibly prototyped redeclarations.
8398 const FunctionType *FT = NewFD->getType()->castAs<FunctionType>();
8399 if (isa<FunctionNoProtoType>(FT) && !D.isFunctionDefinition()) {
8400 CallingConv CC = FT->getExtInfo().getCC();
8401 if (!supportsVariadicCall(CC)) {
8402 // Windows system headers sometimes accidentally use stdcall without
8403 // (void) parameters, so we relax this to a warning.
8405 CC == CC_X86StdCall ? diag::warn_cconv_knr : diag::err_cconv_knr;
8406 Diag(NewFD->getLocation(), DiagID)
8407 << FunctionType::getNameForCallConv(CC);
8411 // C++11 [replacement.functions]p3:
8412 // The program's definitions shall not be specified as inline.
8414 // N.B. We diagnose declarations instead of definitions per LWG issue 2340.
8416 // Suppress the diagnostic if the function is __attribute__((used)), since
8417 // that forces an external definition to be emitted.
8418 if (D.getDeclSpec().isInlineSpecified() &&
8419 NewFD->isReplaceableGlobalAllocationFunction() &&
8420 !NewFD->hasAttr<UsedAttr>())
8421 Diag(D.getDeclSpec().getInlineSpecLoc(),
8422 diag::ext_operator_new_delete_declared_inline)
8423 << NewFD->getDeclName();
8425 // If the declarator is a template-id, translate the parser's template
8426 // argument list into our AST format.
8427 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) {
8428 TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
8429 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc);
8430 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc);
8431 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
8432 TemplateId->NumArgs);
8433 translateTemplateArguments(TemplateArgsPtr,
8436 HasExplicitTemplateArgs = true;
8438 if (NewFD->isInvalidDecl()) {
8439 HasExplicitTemplateArgs = false;
8440 } else if (FunctionTemplate) {
8441 // Function template with explicit template arguments.
8442 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec)
8443 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc);
8445 HasExplicitTemplateArgs = false;
8447 assert((isFunctionTemplateSpecialization ||
8448 D.getDeclSpec().isFriendSpecified()) &&
8449 "should have a 'template<>' for this decl");
8450 // "friend void foo<>(int);" is an implicit specialization decl.
8451 isFunctionTemplateSpecialization = true;
8453 } else if (isFriend && isFunctionTemplateSpecialization) {
8454 // This combination is only possible in a recovery case; the user
8455 // wrote something like:
8456 // template <> friend void foo(int);
8457 // which we're recovering from as if the user had written:
8458 // friend void foo<>(int);
8459 // Go ahead and fake up a template id.
8460 HasExplicitTemplateArgs = true;
8461 TemplateArgs.setLAngleLoc(D.getIdentifierLoc());
8462 TemplateArgs.setRAngleLoc(D.getIdentifierLoc());
8465 // We do not add HD attributes to specializations here because
8466 // they may have different constexpr-ness compared to their
8467 // templates and, after maybeAddCUDAHostDeviceAttrs() is applied,
8468 // may end up with different effective targets. Instead, a
8469 // specialization inherits its target attributes from its template
8470 // in the CheckFunctionTemplateSpecialization() call below.
8471 if (getLangOpts().CUDA & !isFunctionTemplateSpecialization)
8472 maybeAddCUDAHostDeviceAttrs(NewFD, Previous);
8474 // If it's a friend (and only if it's a friend), it's possible
8475 // that either the specialized function type or the specialized
8476 // template is dependent, and therefore matching will fail. In
8477 // this case, don't check the specialization yet.
8478 bool InstantiationDependent = false;
8479 if (isFunctionTemplateSpecialization && isFriend &&
8480 (NewFD->getType()->isDependentType() || DC->isDependentContext() ||
8481 TemplateSpecializationType::anyDependentTemplateArguments(
8483 InstantiationDependent))) {
8484 assert(HasExplicitTemplateArgs &&
8485 "friend function specialization without template args");
8486 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs,
8488 NewFD->setInvalidDecl();
8489 } else if (isFunctionTemplateSpecialization) {
8490 if (CurContext->isDependentContext() && CurContext->isRecord()
8492 isDependentClassScopeExplicitSpecialization = true;
8493 Diag(NewFD->getLocation(), getLangOpts().MicrosoftExt ?
8494 diag::ext_function_specialization_in_class :
8495 diag::err_function_specialization_in_class)
8496 << NewFD->getDeclName();
8497 } else if (CheckFunctionTemplateSpecialization(NewFD,
8498 (HasExplicitTemplateArgs ? &TemplateArgs
8501 NewFD->setInvalidDecl();
8504 // A storage-class-specifier shall not be specified in an explicit
8505 // specialization (14.7.3)
8506 FunctionTemplateSpecializationInfo *Info =
8507 NewFD->getTemplateSpecializationInfo();
8508 if (Info && SC != SC_None) {
8509 if (SC != Info->getTemplate()->getTemplatedDecl()->getStorageClass())
8510 Diag(NewFD->getLocation(),
8511 diag::err_explicit_specialization_inconsistent_storage_class)
8513 << FixItHint::CreateRemoval(
8514 D.getDeclSpec().getStorageClassSpecLoc());
8517 Diag(NewFD->getLocation(),
8518 diag::ext_explicit_specialization_storage_class)
8519 << FixItHint::CreateRemoval(
8520 D.getDeclSpec().getStorageClassSpecLoc());
8522 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) {
8523 if (CheckMemberSpecialization(NewFD, Previous))
8524 NewFD->setInvalidDecl();
8527 // Perform semantic checking on the function declaration.
8528 if (!isDependentClassScopeExplicitSpecialization) {
8529 if (!NewFD->isInvalidDecl() && NewFD->isMain())
8530 CheckMain(NewFD, D.getDeclSpec());
8532 if (!NewFD->isInvalidDecl() && NewFD->isMSVCRTEntryPoint())
8533 CheckMSVCRTEntryPoint(NewFD);
8535 if (!NewFD->isInvalidDecl())
8536 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous,
8537 isExplicitSpecialization));
8538 else if (!Previous.empty())
8539 // Recover gracefully from an invalid redeclaration.
8540 D.setRedeclaration(true);
8543 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() ||
8544 Previous.getResultKind() != LookupResult::FoundOverloaded) &&
8545 "previous declaration set still overloaded");
8547 NamedDecl *PrincipalDecl = (FunctionTemplate
8548 ? cast<NamedDecl>(FunctionTemplate)
8551 if (isFriend && NewFD->getPreviousDecl()) {
8552 AccessSpecifier Access = AS_public;
8553 if (!NewFD->isInvalidDecl())
8554 Access = NewFD->getPreviousDecl()->getAccess();
8556 NewFD->setAccess(Access);
8557 if (FunctionTemplate) FunctionTemplate->setAccess(Access);
8560 if (NewFD->isOverloadedOperator() && !DC->isRecord() &&
8561 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary))
8562 PrincipalDecl->setNonMemberOperator();
8564 // If we have a function template, check the template parameter
8565 // list. This will check and merge default template arguments.
8566 if (FunctionTemplate) {
8567 FunctionTemplateDecl *PrevTemplate =
8568 FunctionTemplate->getPreviousDecl();
8569 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(),
8570 PrevTemplate ? PrevTemplate->getTemplateParameters()
8572 D.getDeclSpec().isFriendSpecified()
8573 ? (D.isFunctionDefinition()
8574 ? TPC_FriendFunctionTemplateDefinition
8575 : TPC_FriendFunctionTemplate)
8576 : (D.getCXXScopeSpec().isSet() &&
8577 DC && DC->isRecord() &&
8578 DC->isDependentContext())
8579 ? TPC_ClassTemplateMember
8580 : TPC_FunctionTemplate);
8583 if (NewFD->isInvalidDecl()) {
8584 // Ignore all the rest of this.
8585 } else if (!D.isRedeclaration()) {
8586 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists,
8588 // Fake up an access specifier if it's supposed to be a class member.
8589 if (isa<CXXRecordDecl>(NewFD->getDeclContext()))
8590 NewFD->setAccess(AS_public);
8592 // Qualified decls generally require a previous declaration.
8593 if (D.getCXXScopeSpec().isSet()) {
8594 // ...with the major exception of templated-scope or
8595 // dependent-scope friend declarations.
8597 // TODO: we currently also suppress this check in dependent
8598 // contexts because (1) the parameter depth will be off when
8599 // matching friend templates and (2) we might actually be
8600 // selecting a friend based on a dependent factor. But there
8601 // are situations where these conditions don't apply and we
8602 // can actually do this check immediately.
8604 (TemplateParamLists.size() ||
8605 D.getCXXScopeSpec().getScopeRep()->isDependent() ||
8606 CurContext->isDependentContext())) {
8609 // The user tried to provide an out-of-line definition for a
8610 // function that is a member of a class or namespace, but there
8611 // was no such member function declared (C++ [class.mfct]p2,
8612 // C++ [namespace.memdef]p2). For example:
8618 // void X::f() { } // ill-formed
8620 // Complain about this problem, and attempt to suggest close
8621 // matches (e.g., those that differ only in cv-qualifiers and
8622 // whether the parameter types are references).
8624 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(
8625 *this, Previous, NewFD, ExtraArgs, false, nullptr)) {
8626 AddToScope = ExtraArgs.AddToScope;
8631 // Unqualified local friend declarations are required to resolve
8633 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) {
8634 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(
8635 *this, Previous, NewFD, ExtraArgs, true, S)) {
8636 AddToScope = ExtraArgs.AddToScope;
8640 } else if (!D.isFunctionDefinition() &&
8641 isa<CXXMethodDecl>(NewFD) && NewFD->isOutOfLine() &&
8642 !isFriend && !isFunctionTemplateSpecialization &&
8643 !isExplicitSpecialization) {
8644 // An out-of-line member function declaration must also be a
8645 // definition (C++ [class.mfct]p2).
8646 // Note that this is not the case for explicit specializations of
8647 // function templates or member functions of class templates, per
8648 // C++ [temp.expl.spec]p2. We also allow these declarations as an
8649 // extension for compatibility with old SWIG code which likes to
8651 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration)
8652 << D.getCXXScopeSpec().getRange();
8656 ProcessPragmaWeak(S, NewFD);
8657 checkAttributesAfterMerging(*this, *NewFD);
8659 AddKnownFunctionAttributes(NewFD);
8661 if (NewFD->hasAttr<OverloadableAttr>() &&
8662 !NewFD->getType()->getAs<FunctionProtoType>()) {
8663 Diag(NewFD->getLocation(),
8664 diag::err_attribute_overloadable_no_prototype)
8667 // Turn this into a variadic function with no parameters.
8668 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>();
8669 FunctionProtoType::ExtProtoInfo EPI(
8670 Context.getDefaultCallingConvention(true, false));
8671 EPI.Variadic = true;
8672 EPI.ExtInfo = FT->getExtInfo();
8674 QualType R = Context.getFunctionType(FT->getReturnType(), None, EPI);
8678 // If there's a #pragma GCC visibility in scope, and this isn't a class
8679 // member, set the visibility of this function.
8680 if (!DC->isRecord() && NewFD->isExternallyVisible())
8681 AddPushedVisibilityAttribute(NewFD);
8683 // If there's a #pragma clang arc_cf_code_audited in scope, consider
8684 // marking the function.
8685 AddCFAuditedAttribute(NewFD);
8687 // If this is a function definition, check if we have to apply optnone due to
8689 if(D.isFunctionDefinition())
8690 AddRangeBasedOptnone(NewFD);
8692 // If this is the first declaration of an extern C variable, update
8693 // the map of such variables.
8694 if (NewFD->isFirstDecl() && !NewFD->isInvalidDecl() &&
8695 isIncompleteDeclExternC(*this, NewFD))
8696 RegisterLocallyScopedExternCDecl(NewFD, S);
8698 // Set this FunctionDecl's range up to the right paren.
8699 NewFD->setRangeEnd(D.getSourceRange().getEnd());
8701 if (D.isRedeclaration() && !Previous.empty()) {
8702 checkDLLAttributeRedeclaration(
8703 *this, dyn_cast<NamedDecl>(Previous.getRepresentativeDecl()), NewFD,
8704 isExplicitSpecialization || isFunctionTemplateSpecialization,
8705 D.isFunctionDefinition());
8708 if (getLangOpts().CUDA) {
8709 IdentifierInfo *II = NewFD->getIdentifier();
8710 if (II && II->isStr("cudaConfigureCall") && !NewFD->isInvalidDecl() &&
8711 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) {
8712 if (!R->getAs<FunctionType>()->getReturnType()->isScalarType())
8713 Diag(NewFD->getLocation(), diag::err_config_scalar_return);
8715 Context.setcudaConfigureCallDecl(NewFD);
8718 // Variadic functions, other than a *declaration* of printf, are not allowed
8719 // in device-side CUDA code, unless someone passed
8720 // -fcuda-allow-variadic-functions.
8721 if (!getLangOpts().CUDAAllowVariadicFunctions && NewFD->isVariadic() &&
8722 (NewFD->hasAttr<CUDADeviceAttr>() ||
8723 NewFD->hasAttr<CUDAGlobalAttr>()) &&
8724 !(II && II->isStr("printf") && NewFD->isExternC() &&
8725 !D.isFunctionDefinition())) {
8726 Diag(NewFD->getLocation(), diag::err_variadic_device_fn);
8730 if (getLangOpts().CPlusPlus) {
8731 if (FunctionTemplate) {
8732 if (NewFD->isInvalidDecl())
8733 FunctionTemplate->setInvalidDecl();
8734 return FunctionTemplate;
8738 if (NewFD->hasAttr<OpenCLKernelAttr>()) {
8739 // OpenCL v1.2 s6.8 static is invalid for kernel functions.
8740 if ((getLangOpts().OpenCLVersion >= 120)
8741 && (SC == SC_Static)) {
8742 Diag(D.getIdentifierLoc(), diag::err_static_kernel);
8746 // OpenCL v1.2, s6.9 -- Kernels can only have return type void.
8747 if (!NewFD->getReturnType()->isVoidType()) {
8748 SourceRange RTRange = NewFD->getReturnTypeSourceRange();
8749 Diag(D.getIdentifierLoc(), diag::err_expected_kernel_void_return_type)
8750 << (RTRange.isValid() ? FixItHint::CreateReplacement(RTRange, "void")
8755 llvm::SmallPtrSet<const Type *, 16> ValidTypes;
8756 for (auto Param : NewFD->parameters())
8757 checkIsValidOpenCLKernelParameter(*this, D, Param, ValidTypes);
8759 for (const ParmVarDecl *Param : NewFD->parameters()) {
8760 QualType PT = Param->getType();
8762 // OpenCL 2.0 pipe restrictions forbids pipe packet types to be non-value
8764 if (getLangOpts().OpenCLVersion >= 200) {
8765 if(const PipeType *PipeTy = PT->getAs<PipeType>()) {
8766 QualType ElemTy = PipeTy->getElementType();
8767 if (ElemTy->isReferenceType() || ElemTy->isPointerType()) {
8768 Diag(Param->getTypeSpecStartLoc(), diag::err_reference_pipe_type );
8775 MarkUnusedFileScopedDecl(NewFD);
8777 // Here we have an function template explicit specialization at class scope.
8778 // The actually specialization will be postponed to template instatiation
8779 // time via the ClassScopeFunctionSpecializationDecl node.
8780 if (isDependentClassScopeExplicitSpecialization) {
8781 ClassScopeFunctionSpecializationDecl *NewSpec =
8782 ClassScopeFunctionSpecializationDecl::Create(
8783 Context, CurContext, SourceLocation(),
8784 cast<CXXMethodDecl>(NewFD),
8785 HasExplicitTemplateArgs, TemplateArgs);
8786 CurContext->addDecl(NewSpec);
8793 /// \brief Checks if the new declaration declared in dependent context must be
8794 /// put in the same redeclaration chain as the specified declaration.
8796 /// \param D Declaration that is checked.
8797 /// \param PrevDecl Previous declaration found with proper lookup method for the
8798 /// same declaration name.
8799 /// \returns True if D must be added to the redeclaration chain which PrevDecl
8802 bool Sema::shouldLinkDependentDeclWithPrevious(Decl *D, Decl *PrevDecl) {
8803 // Any declarations should be put into redeclaration chains except for
8804 // friend declaration in a dependent context that names a function in
8807 // This allows to compile code like:
8810 // template<typename T> class C1 { friend void func() { } };
8811 // template<typename T> class C2 { friend void func() { } };
8813 // This code snippet is a valid code unless both templates are instantiated.
8814 return !(D->getLexicalDeclContext()->isDependentContext() &&
8815 D->getDeclContext()->isFileContext() &&
8816 D->getFriendObjectKind() != Decl::FOK_None);
8819 /// \brief Perform semantic checking of a new function declaration.
8821 /// Performs semantic analysis of the new function declaration
8822 /// NewFD. This routine performs all semantic checking that does not
8823 /// require the actual declarator involved in the declaration, and is
8824 /// used both for the declaration of functions as they are parsed
8825 /// (called via ActOnDeclarator) and for the declaration of functions
8826 /// that have been instantiated via C++ template instantiation (called
8827 /// via InstantiateDecl).
8829 /// \param IsExplicitSpecialization whether this new function declaration is
8830 /// an explicit specialization of the previous declaration.
8832 /// This sets NewFD->isInvalidDecl() to true if there was an error.
8834 /// \returns true if the function declaration is a redeclaration.
8835 bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD,
8836 LookupResult &Previous,
8837 bool IsExplicitSpecialization) {
8838 assert(!NewFD->getReturnType()->isVariablyModifiedType() &&
8839 "Variably modified return types are not handled here");
8841 // Determine whether the type of this function should be merged with
8842 // a previous visible declaration. This never happens for functions in C++,
8843 // and always happens in C if the previous declaration was visible.
8844 bool MergeTypeWithPrevious = !getLangOpts().CPlusPlus &&
8845 !Previous.isShadowed();
8847 bool Redeclaration = false;
8848 NamedDecl *OldDecl = nullptr;
8850 // Merge or overload the declaration with an existing declaration of
8851 // the same name, if appropriate.
8852 if (!Previous.empty()) {
8853 // Determine whether NewFD is an overload of PrevDecl or
8854 // a declaration that requires merging. If it's an overload,
8855 // there's no more work to do here; we'll just add the new
8856 // function to the scope.
8857 if (!AllowOverloadingOfFunction(Previous, Context)) {
8858 NamedDecl *Candidate = Previous.getRepresentativeDecl();
8859 if (shouldLinkPossiblyHiddenDecl(Candidate, NewFD)) {
8860 Redeclaration = true;
8861 OldDecl = Candidate;
8864 switch (CheckOverload(S, NewFD, Previous, OldDecl,
8865 /*NewIsUsingDecl*/ false)) {
8867 Redeclaration = true;
8870 case Ovl_NonFunction:
8871 Redeclaration = true;
8875 Redeclaration = false;
8879 if (!getLangOpts().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) {
8880 // If a function name is overloadable in C, then every function
8881 // with that name must be marked "overloadable".
8882 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing)
8883 << Redeclaration << NewFD;
8884 NamedDecl *OverloadedDecl = nullptr;
8886 OverloadedDecl = OldDecl;
8887 else if (!Previous.empty())
8888 OverloadedDecl = Previous.getRepresentativeDecl();
8890 Diag(OverloadedDecl->getLocation(),
8891 diag::note_attribute_overloadable_prev_overload);
8892 NewFD->addAttr(OverloadableAttr::CreateImplicit(Context));
8897 // Check for a previous extern "C" declaration with this name.
8898 if (!Redeclaration &&
8899 checkForConflictWithNonVisibleExternC(*this, NewFD, Previous)) {
8900 if (!Previous.empty()) {
8901 // This is an extern "C" declaration with the same name as a previous
8902 // declaration, and thus redeclares that entity...
8903 Redeclaration = true;
8904 OldDecl = Previous.getFoundDecl();
8905 MergeTypeWithPrevious = false;
8907 // ... except in the presence of __attribute__((overloadable)).
8908 if (OldDecl->hasAttr<OverloadableAttr>()) {
8909 if (!getLangOpts().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) {
8910 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing)
8911 << Redeclaration << NewFD;
8912 Diag(Previous.getFoundDecl()->getLocation(),
8913 diag::note_attribute_overloadable_prev_overload);
8914 NewFD->addAttr(OverloadableAttr::CreateImplicit(Context));
8916 if (IsOverload(NewFD, cast<FunctionDecl>(OldDecl), false)) {
8917 Redeclaration = false;
8924 // C++11 [dcl.constexpr]p8:
8925 // A constexpr specifier for a non-static member function that is not
8926 // a constructor declares that member function to be const.
8928 // This needs to be delayed until we know whether this is an out-of-line
8929 // definition of a static member function.
8931 // This rule is not present in C++1y, so we produce a backwards
8932 // compatibility warning whenever it happens in C++11.
8933 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD);
8934 if (!getLangOpts().CPlusPlus14 && MD && MD->isConstexpr() &&
8935 !MD->isStatic() && !isa<CXXConstructorDecl>(MD) &&
8936 (MD->getTypeQualifiers() & Qualifiers::Const) == 0) {
8937 CXXMethodDecl *OldMD = nullptr;
8939 OldMD = dyn_cast_or_null<CXXMethodDecl>(OldDecl->getAsFunction());
8940 if (!OldMD || !OldMD->isStatic()) {
8941 const FunctionProtoType *FPT =
8942 MD->getType()->castAs<FunctionProtoType>();
8943 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
8944 EPI.TypeQuals |= Qualifiers::Const;
8945 MD->setType(Context.getFunctionType(FPT->getReturnType(),
8946 FPT->getParamTypes(), EPI));
8948 // Warn that we did this, if we're not performing template instantiation.
8949 // In that case, we'll have warned already when the template was defined.
8950 if (ActiveTemplateInstantiations.empty()) {
8951 SourceLocation AddConstLoc;
8952 if (FunctionTypeLoc FTL = MD->getTypeSourceInfo()->getTypeLoc()
8953 .IgnoreParens().getAs<FunctionTypeLoc>())
8954 AddConstLoc = getLocForEndOfToken(FTL.getRParenLoc());
8956 Diag(MD->getLocation(), diag::warn_cxx14_compat_constexpr_not_const)
8957 << FixItHint::CreateInsertion(AddConstLoc, " const");
8962 if (Redeclaration) {
8963 // NewFD and OldDecl represent declarations that need to be
8965 if (MergeFunctionDecl(NewFD, OldDecl, S, MergeTypeWithPrevious)) {
8966 NewFD->setInvalidDecl();
8967 return Redeclaration;
8971 Previous.addDecl(OldDecl);
8973 if (FunctionTemplateDecl *OldTemplateDecl
8974 = dyn_cast<FunctionTemplateDecl>(OldDecl)) {
8975 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl());
8976 FunctionTemplateDecl *NewTemplateDecl
8977 = NewFD->getDescribedFunctionTemplate();
8978 assert(NewTemplateDecl && "Template/non-template mismatch");
8979 if (CXXMethodDecl *Method
8980 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) {
8981 Method->setAccess(OldTemplateDecl->getAccess());
8982 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess());
8985 // If this is an explicit specialization of a member that is a function
8986 // template, mark it as a member specialization.
8987 if (IsExplicitSpecialization &&
8988 NewTemplateDecl->getInstantiatedFromMemberTemplate()) {
8989 NewTemplateDecl->setMemberSpecialization();
8990 assert(OldTemplateDecl->isMemberSpecialization());
8991 // Explicit specializations of a member template do not inherit deleted
8992 // status from the parent member template that they are specializing.
8993 if (OldTemplateDecl->getTemplatedDecl()->isDeleted()) {
8994 FunctionDecl *const OldTemplatedDecl =
8995 OldTemplateDecl->getTemplatedDecl();
8996 assert(OldTemplatedDecl->getCanonicalDecl() == OldTemplatedDecl);
8997 OldTemplatedDecl->setDeletedAsWritten(false);
9002 if (shouldLinkDependentDeclWithPrevious(NewFD, OldDecl)) {
9003 // This needs to happen first so that 'inline' propagates.
9004 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl));
9005 if (isa<CXXMethodDecl>(NewFD))
9006 NewFD->setAccess(OldDecl->getAccess());
9011 // Semantic checking for this function declaration (in isolation).
9013 if (getLangOpts().CPlusPlus) {
9014 // C++-specific checks.
9015 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) {
9016 CheckConstructor(Constructor);
9017 } else if (CXXDestructorDecl *Destructor =
9018 dyn_cast<CXXDestructorDecl>(NewFD)) {
9019 CXXRecordDecl *Record = Destructor->getParent();
9020 QualType ClassType = Context.getTypeDeclType(Record);
9022 // FIXME: Shouldn't we be able to perform this check even when the class
9023 // type is dependent? Both gcc and edg can handle that.
9024 if (!ClassType->isDependentType()) {
9025 DeclarationName Name
9026 = Context.DeclarationNames.getCXXDestructorName(
9027 Context.getCanonicalType(ClassType));
9028 if (NewFD->getDeclName() != Name) {
9029 Diag(NewFD->getLocation(), diag::err_destructor_name);
9030 NewFD->setInvalidDecl();
9031 return Redeclaration;
9034 } else if (CXXConversionDecl *Conversion
9035 = dyn_cast<CXXConversionDecl>(NewFD)) {
9036 ActOnConversionDeclarator(Conversion);
9039 // Find any virtual functions that this function overrides.
9040 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) {
9041 if (!Method->isFunctionTemplateSpecialization() &&
9042 !Method->getDescribedFunctionTemplate() &&
9043 Method->isCanonicalDecl()) {
9044 if (AddOverriddenMethods(Method->getParent(), Method)) {
9045 // If the function was marked as "static", we have a problem.
9046 if (NewFD->getStorageClass() == SC_Static) {
9047 ReportOverrides(*this, diag::err_static_overrides_virtual, Method);
9052 if (Method->isStatic())
9053 checkThisInStaticMemberFunctionType(Method);
9056 // Extra checking for C++ overloaded operators (C++ [over.oper]).
9057 if (NewFD->isOverloadedOperator() &&
9058 CheckOverloadedOperatorDeclaration(NewFD)) {
9059 NewFD->setInvalidDecl();
9060 return Redeclaration;
9063 // Extra checking for C++0x literal operators (C++0x [over.literal]).
9064 if (NewFD->getLiteralIdentifier() &&
9065 CheckLiteralOperatorDeclaration(NewFD)) {
9066 NewFD->setInvalidDecl();
9067 return Redeclaration;
9070 // In C++, check default arguments now that we have merged decls. Unless
9071 // the lexical context is the class, because in this case this is done
9072 // during delayed parsing anyway.
9073 if (!CurContext->isRecord())
9074 CheckCXXDefaultArguments(NewFD);
9076 // If this function declares a builtin function, check the type of this
9077 // declaration against the expected type for the builtin.
9078 if (unsigned BuiltinID = NewFD->getBuiltinID()) {
9079 ASTContext::GetBuiltinTypeError Error;
9080 LookupPredefedObjCSuperType(*this, S, NewFD->getIdentifier());
9081 QualType T = Context.GetBuiltinType(BuiltinID, Error);
9082 // If the type of the builtin differs only in its exception
9083 // specification, that's OK.
9084 // FIXME: If the types do differ in this way, it would be better to
9085 // retain the 'noexcept' form of the type.
9087 !Context.hasSameFunctionTypeIgnoringExceptionSpec(T,
9089 // The type of this function differs from the type of the builtin,
9090 // so forget about the builtin entirely.
9091 Context.BuiltinInfo.forgetBuiltin(BuiltinID, Context.Idents);
9094 // If this function is declared as being extern "C", then check to see if
9095 // the function returns a UDT (class, struct, or union type) that is not C
9096 // compatible, and if it does, warn the user.
9097 // But, issue any diagnostic on the first declaration only.
9098 if (Previous.empty() && NewFD->isExternC()) {
9099 QualType R = NewFD->getReturnType();
9100 if (R->isIncompleteType() && !R->isVoidType())
9101 Diag(NewFD->getLocation(), diag::warn_return_value_udt_incomplete)
9103 else if (!R.isPODType(Context) && !R->isVoidType() &&
9104 !R->isObjCObjectPointerType())
9105 Diag(NewFD->getLocation(), diag::warn_return_value_udt) << NewFD << R;
9108 // C++1z [dcl.fct]p6:
9109 // [...] whether the function has a non-throwing exception-specification
9110 // [is] part of the function type
9112 // This results in an ABI break between C++14 and C++17 for functions whose
9113 // declared type includes an exception-specification in a parameter or
9114 // return type. (Exception specifications on the function itself are OK in
9115 // most cases, and exception specifications are not permitted in most other
9116 // contexts where they could make it into a mangling.)
9117 if (!getLangOpts().CPlusPlus1z && !NewFD->getPrimaryTemplate()) {
9118 auto HasNoexcept = [&](QualType T) -> bool {
9119 // Strip off declarator chunks that could be between us and a function
9120 // type. We don't need to look far, exception specifications are very
9121 // restricted prior to C++17.
9122 if (auto *RT = T->getAs<ReferenceType>())
9123 T = RT->getPointeeType();
9124 else if (T->isAnyPointerType())
9125 T = T->getPointeeType();
9126 else if (auto *MPT = T->getAs<MemberPointerType>())
9127 T = MPT->getPointeeType();
9128 if (auto *FPT = T->getAs<FunctionProtoType>())
9129 if (FPT->isNothrow(Context))
9134 auto *FPT = NewFD->getType()->castAs<FunctionProtoType>();
9135 bool AnyNoexcept = HasNoexcept(FPT->getReturnType());
9136 for (QualType T : FPT->param_types())
9137 AnyNoexcept |= HasNoexcept(T);
9139 Diag(NewFD->getLocation(),
9140 diag::warn_cxx1z_compat_exception_spec_in_signature)
9144 if (!Redeclaration && LangOpts.CUDA)
9145 checkCUDATargetOverload(NewFD, Previous);
9147 return Redeclaration;
9150 void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) {
9151 // C++11 [basic.start.main]p3:
9152 // A program that [...] declares main to be inline, static or
9153 // constexpr is ill-formed.
9154 // C11 6.7.4p4: In a hosted environment, no function specifier(s) shall
9155 // appear in a declaration of main.
9156 // static main is not an error under C99, but we should warn about it.
9157 // We accept _Noreturn main as an extension.
9158 if (FD->getStorageClass() == SC_Static)
9159 Diag(DS.getStorageClassSpecLoc(), getLangOpts().CPlusPlus
9160 ? diag::err_static_main : diag::warn_static_main)
9161 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
9162 if (FD->isInlineSpecified())
9163 Diag(DS.getInlineSpecLoc(), diag::err_inline_main)
9164 << FixItHint::CreateRemoval(DS.getInlineSpecLoc());
9165 if (DS.isNoreturnSpecified()) {
9166 SourceLocation NoreturnLoc = DS.getNoreturnSpecLoc();
9167 SourceRange NoreturnRange(NoreturnLoc, getLocForEndOfToken(NoreturnLoc));
9168 Diag(NoreturnLoc, diag::ext_noreturn_main);
9169 Diag(NoreturnLoc, diag::note_main_remove_noreturn)
9170 << FixItHint::CreateRemoval(NoreturnRange);
9172 if (FD->isConstexpr()) {
9173 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_main)
9174 << FixItHint::CreateRemoval(DS.getConstexprSpecLoc());
9175 FD->setConstexpr(false);
9178 if (getLangOpts().OpenCL) {
9179 Diag(FD->getLocation(), diag::err_opencl_no_main)
9180 << FD->hasAttr<OpenCLKernelAttr>();
9181 FD->setInvalidDecl();
9185 QualType T = FD->getType();
9186 assert(T->isFunctionType() && "function decl is not of function type");
9187 const FunctionType* FT = T->castAs<FunctionType>();
9189 if (getLangOpts().GNUMode && !getLangOpts().CPlusPlus) {
9190 // In C with GNU extensions we allow main() to have non-integer return
9191 // type, but we should warn about the extension, and we disable the
9192 // implicit-return-zero rule.
9194 // GCC in C mode accepts qualified 'int'.
9195 if (Context.hasSameUnqualifiedType(FT->getReturnType(), Context.IntTy))
9196 FD->setHasImplicitReturnZero(true);
9198 Diag(FD->getTypeSpecStartLoc(), diag::ext_main_returns_nonint);
9199 SourceRange RTRange = FD->getReturnTypeSourceRange();
9200 if (RTRange.isValid())
9201 Diag(RTRange.getBegin(), diag::note_main_change_return_type)
9202 << FixItHint::CreateReplacement(RTRange, "int");
9205 // In C and C++, main magically returns 0 if you fall off the end;
9206 // set the flag which tells us that.
9207 // This is C++ [basic.start.main]p5 and C99 5.1.2.2.3.
9209 // All the standards say that main() should return 'int'.
9210 if (Context.hasSameType(FT->getReturnType(), Context.IntTy))
9211 FD->setHasImplicitReturnZero(true);
9213 // Otherwise, this is just a flat-out error.
9214 SourceRange RTRange = FD->getReturnTypeSourceRange();
9215 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint)
9216 << (RTRange.isValid() ? FixItHint::CreateReplacement(RTRange, "int")
9218 FD->setInvalidDecl(true);
9222 // Treat protoless main() as nullary.
9223 if (isa<FunctionNoProtoType>(FT)) return;
9225 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT);
9226 unsigned nparams = FTP->getNumParams();
9227 assert(FD->getNumParams() == nparams);
9229 bool HasExtraParameters = (nparams > 3);
9231 if (FTP->isVariadic()) {
9232 Diag(FD->getLocation(), diag::ext_variadic_main);
9233 // FIXME: if we had information about the location of the ellipsis, we
9234 // could add a FixIt hint to remove it as a parameter.
9237 // Darwin passes an undocumented fourth argument of type char**. If
9238 // other platforms start sprouting these, the logic below will start
9240 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin())
9241 HasExtraParameters = false;
9243 if (HasExtraParameters) {
9244 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams;
9245 FD->setInvalidDecl(true);
9249 // FIXME: a lot of the following diagnostics would be improved
9250 // if we had some location information about types.
9253 Context.getPointerType(Context.getPointerType(Context.CharTy));
9254 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP };
9256 for (unsigned i = 0; i < nparams; ++i) {
9257 QualType AT = FTP->getParamType(i);
9259 bool mismatch = true;
9261 if (Context.hasSameUnqualifiedType(AT, Expected[i]))
9263 else if (Expected[i] == CharPP) {
9264 // As an extension, the following forms are okay:
9266 // char const * const *
9269 QualifierCollector qs;
9270 const PointerType* PT;
9271 if ((PT = qs.strip(AT)->getAs<PointerType>()) &&
9272 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) &&
9273 Context.hasSameType(QualType(qs.strip(PT->getPointeeType()), 0),
9276 mismatch = !qs.empty();
9281 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i];
9282 // TODO: suggest replacing given type with expected type
9283 FD->setInvalidDecl(true);
9287 if (nparams == 1 && !FD->isInvalidDecl()) {
9288 Diag(FD->getLocation(), diag::warn_main_one_arg);
9291 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) {
9292 Diag(FD->getLocation(), diag::err_mainlike_template_decl) << FD;
9293 FD->setInvalidDecl();
9297 void Sema::CheckMSVCRTEntryPoint(FunctionDecl *FD) {
9298 QualType T = FD->getType();
9299 assert(T->isFunctionType() && "function decl is not of function type");
9300 const FunctionType *FT = T->castAs<FunctionType>();
9302 // Set an implicit return of 'zero' if the function can return some integral,
9303 // enumeration, pointer or nullptr type.
9304 if (FT->getReturnType()->isIntegralOrEnumerationType() ||
9305 FT->getReturnType()->isAnyPointerType() ||
9306 FT->getReturnType()->isNullPtrType())
9307 // DllMain is exempt because a return value of zero means it failed.
9308 if (FD->getName() != "DllMain")
9309 FD->setHasImplicitReturnZero(true);
9311 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) {
9312 Diag(FD->getLocation(), diag::err_mainlike_template_decl) << FD;
9313 FD->setInvalidDecl();
9317 bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) {
9318 // FIXME: Need strict checking. In C89, we need to check for
9319 // any assignment, increment, decrement, function-calls, or
9320 // commas outside of a sizeof. In C99, it's the same list,
9321 // except that the aforementioned are allowed in unevaluated
9322 // expressions. Everything else falls under the
9323 // "may accept other forms of constant expressions" exception.
9324 // (We never end up here for C++, so the constant expression
9325 // rules there don't matter.)
9326 const Expr *Culprit;
9327 if (Init->isConstantInitializer(Context, false, &Culprit))
9329 Diag(Culprit->getExprLoc(), diag::err_init_element_not_constant)
9330 << Culprit->getSourceRange();
9335 // Visits an initialization expression to see if OrigDecl is evaluated in
9336 // its own initialization and throws a warning if it does.
9337 class SelfReferenceChecker
9338 : public EvaluatedExprVisitor<SelfReferenceChecker> {
9343 bool isReferenceType;
9346 llvm::SmallVector<unsigned, 4> InitFieldIndex;
9349 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited;
9351 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context),
9352 S(S), OrigDecl(OrigDecl) {
9354 isRecordType = false;
9355 isReferenceType = false;
9357 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) {
9358 isPODType = VD->getType().isPODType(S.Context);
9359 isRecordType = VD->getType()->isRecordType();
9360 isReferenceType = VD->getType()->isReferenceType();
9364 // For most expressions, just call the visitor. For initializer lists,
9365 // track the index of the field being initialized since fields are
9366 // initialized in order allowing use of previously initialized fields.
9367 void CheckExpr(Expr *E) {
9368 InitListExpr *InitList = dyn_cast<InitListExpr>(E);
9374 // Track and increment the index here.
9376 InitFieldIndex.push_back(0);
9377 for (auto Child : InitList->children()) {
9378 CheckExpr(cast<Expr>(Child));
9379 ++InitFieldIndex.back();
9381 InitFieldIndex.pop_back();
9384 // Returns true if MemberExpr is checked and no futher checking is needed.
9385 // Returns false if additional checking is required.
9386 bool CheckInitListMemberExpr(MemberExpr *E, bool CheckReference) {
9387 llvm::SmallVector<FieldDecl*, 4> Fields;
9389 bool ReferenceField = false;
9391 // Get the field memebers used.
9392 while (MemberExpr *ME = dyn_cast<MemberExpr>(Base)) {
9393 FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl());
9396 Fields.push_back(FD);
9397 if (FD->getType()->isReferenceType())
9398 ReferenceField = true;
9399 Base = ME->getBase()->IgnoreParenImpCasts();
9402 // Keep checking only if the base Decl is the same.
9403 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Base);
9404 if (!DRE || DRE->getDecl() != OrigDecl)
9407 // A reference field can be bound to an unininitialized field.
9408 if (CheckReference && !ReferenceField)
9411 // Convert FieldDecls to their index number.
9412 llvm::SmallVector<unsigned, 4> UsedFieldIndex;
9413 for (const FieldDecl *I : llvm::reverse(Fields))
9414 UsedFieldIndex.push_back(I->getFieldIndex());
9416 // See if a warning is needed by checking the first difference in index
9417 // numbers. If field being used has index less than the field being
9418 // initialized, then the use is safe.
9419 for (auto UsedIter = UsedFieldIndex.begin(),
9420 UsedEnd = UsedFieldIndex.end(),
9421 OrigIter = InitFieldIndex.begin(),
9422 OrigEnd = InitFieldIndex.end();
9423 UsedIter != UsedEnd && OrigIter != OrigEnd; ++UsedIter, ++OrigIter) {
9424 if (*UsedIter < *OrigIter)
9426 if (*UsedIter > *OrigIter)
9430 // TODO: Add a different warning which will print the field names.
9431 HandleDeclRefExpr(DRE);
9435 // For most expressions, the cast is directly above the DeclRefExpr.
9436 // For conditional operators, the cast can be outside the conditional
9437 // operator if both expressions are DeclRefExpr's.
9438 void HandleValue(Expr *E) {
9439 E = E->IgnoreParens();
9440 if (DeclRefExpr* DRE = dyn_cast<DeclRefExpr>(E)) {
9441 HandleDeclRefExpr(DRE);
9445 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) {
9446 Visit(CO->getCond());
9447 HandleValue(CO->getTrueExpr());
9448 HandleValue(CO->getFalseExpr());
9452 if (BinaryConditionalOperator *BCO =
9453 dyn_cast<BinaryConditionalOperator>(E)) {
9454 Visit(BCO->getCond());
9455 HandleValue(BCO->getFalseExpr());
9459 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) {
9460 HandleValue(OVE->getSourceExpr());
9464 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) {
9465 if (BO->getOpcode() == BO_Comma) {
9466 Visit(BO->getLHS());
9467 HandleValue(BO->getRHS());
9472 if (isa<MemberExpr>(E)) {
9474 if (CheckInitListMemberExpr(cast<MemberExpr>(E),
9475 false /*CheckReference*/))
9479 Expr *Base = E->IgnoreParenImpCasts();
9480 while (MemberExpr *ME = dyn_cast<MemberExpr>(Base)) {
9481 // Check for static member variables and don't warn on them.
9482 if (!isa<FieldDecl>(ME->getMemberDecl()))
9484 Base = ME->getBase()->IgnoreParenImpCasts();
9486 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Base))
9487 HandleDeclRefExpr(DRE);
9494 // Reference types not handled in HandleValue are handled here since all
9495 // uses of references are bad, not just r-value uses.
9496 void VisitDeclRefExpr(DeclRefExpr *E) {
9497 if (isReferenceType)
9498 HandleDeclRefExpr(E);
9501 void VisitImplicitCastExpr(ImplicitCastExpr *E) {
9502 if (E->getCastKind() == CK_LValueToRValue) {
9503 HandleValue(E->getSubExpr());
9507 Inherited::VisitImplicitCastExpr(E);
9510 void VisitMemberExpr(MemberExpr *E) {
9512 if (CheckInitListMemberExpr(E, true /*CheckReference*/))
9516 // Don't warn on arrays since they can be treated as pointers.
9517 if (E->getType()->canDecayToPointerType()) return;
9519 // Warn when a non-static method call is followed by non-static member
9520 // field accesses, which is followed by a DeclRefExpr.
9521 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(E->getMemberDecl());
9522 bool Warn = (MD && !MD->isStatic());
9523 Expr *Base = E->getBase()->IgnoreParenImpCasts();
9524 while (MemberExpr *ME = dyn_cast<MemberExpr>(Base)) {
9525 if (!isa<FieldDecl>(ME->getMemberDecl()))
9527 Base = ME->getBase()->IgnoreParenImpCasts();
9530 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Base)) {
9532 HandleDeclRefExpr(DRE);
9536 // The base of a MemberExpr is not a MemberExpr or a DeclRefExpr.
9537 // Visit that expression.
9541 void VisitCXXOperatorCallExpr(CXXOperatorCallExpr *E) {
9542 Expr *Callee = E->getCallee();
9544 if (isa<UnresolvedLookupExpr>(Callee))
9545 return Inherited::VisitCXXOperatorCallExpr(E);
9548 for (auto Arg: E->arguments())
9549 HandleValue(Arg->IgnoreParenImpCasts());
9552 void VisitUnaryOperator(UnaryOperator *E) {
9553 // For POD record types, addresses of its own members are well-defined.
9554 if (E->getOpcode() == UO_AddrOf && isRecordType &&
9555 isa<MemberExpr>(E->getSubExpr()->IgnoreParens())) {
9557 HandleValue(E->getSubExpr());
9561 if (E->isIncrementDecrementOp()) {
9562 HandleValue(E->getSubExpr());
9566 Inherited::VisitUnaryOperator(E);
9569 void VisitObjCMessageExpr(ObjCMessageExpr *E) {}
9571 void VisitCXXConstructExpr(CXXConstructExpr *E) {
9572 if (E->getConstructor()->isCopyConstructor()) {
9573 Expr *ArgExpr = E->getArg(0);
9574 if (InitListExpr *ILE = dyn_cast<InitListExpr>(ArgExpr))
9575 if (ILE->getNumInits() == 1)
9576 ArgExpr = ILE->getInit(0);
9577 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr))
9578 if (ICE->getCastKind() == CK_NoOp)
9579 ArgExpr = ICE->getSubExpr();
9580 HandleValue(ArgExpr);
9583 Inherited::VisitCXXConstructExpr(E);
9586 void VisitCallExpr(CallExpr *E) {
9587 // Treat std::move as a use.
9588 if (E->getNumArgs() == 1) {
9589 if (FunctionDecl *FD = E->getDirectCallee()) {
9590 if (FD->isInStdNamespace() && FD->getIdentifier() &&
9591 FD->getIdentifier()->isStr("move")) {
9592 HandleValue(E->getArg(0));
9598 Inherited::VisitCallExpr(E);
9601 void VisitBinaryOperator(BinaryOperator *E) {
9602 if (E->isCompoundAssignmentOp()) {
9603 HandleValue(E->getLHS());
9608 Inherited::VisitBinaryOperator(E);
9611 // A custom visitor for BinaryConditionalOperator is needed because the
9612 // regular visitor would check the condition and true expression separately
9613 // but both point to the same place giving duplicate diagnostics.
9614 void VisitBinaryConditionalOperator(BinaryConditionalOperator *E) {
9615 Visit(E->getCond());
9616 Visit(E->getFalseExpr());
9619 void HandleDeclRefExpr(DeclRefExpr *DRE) {
9620 Decl* ReferenceDecl = DRE->getDecl();
9621 if (OrigDecl != ReferenceDecl) return;
9623 if (isReferenceType) {
9624 diag = diag::warn_uninit_self_reference_in_reference_init;
9625 } else if (cast<VarDecl>(OrigDecl)->isStaticLocal()) {
9626 diag = diag::warn_static_self_reference_in_init;
9627 } else if (isa<TranslationUnitDecl>(OrigDecl->getDeclContext()) ||
9628 isa<NamespaceDecl>(OrigDecl->getDeclContext()) ||
9629 DRE->getDecl()->getType()->isRecordType()) {
9630 diag = diag::warn_uninit_self_reference_in_init;
9632 // Local variables will be handled by the CFG analysis.
9636 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE,
9638 << DRE->getNameInfo().getName()
9639 << OrigDecl->getLocation()
9640 << DRE->getSourceRange());
9644 /// CheckSelfReference - Warns if OrigDecl is used in expression E.
9645 static void CheckSelfReference(Sema &S, Decl* OrigDecl, Expr *E,
9647 // Parameters arguments are occassionially constructed with itself,
9648 // for instance, in recursive functions. Skip them.
9649 if (isa<ParmVarDecl>(OrigDecl))
9652 E = E->IgnoreParens();
9654 // Skip checking T a = a where T is not a record or reference type.
9655 // Doing so is a way to silence uninitialized warnings.
9656 if (!DirectInit && !cast<VarDecl>(OrigDecl)->getType()->isRecordType())
9657 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(E))
9658 if (ICE->getCastKind() == CK_LValueToRValue)
9659 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ICE->getSubExpr()))
9660 if (DRE->getDecl() == OrigDecl)
9663 SelfReferenceChecker(S, OrigDecl).CheckExpr(E);
9665 } // end anonymous namespace
9668 // Simple wrapper to add the name of a variable or (if no variable is
9669 // available) a DeclarationName into a diagnostic.
9670 struct VarDeclOrName {
9672 DeclarationName Name;
9674 friend const Sema::SemaDiagnosticBuilder &
9675 operator<<(const Sema::SemaDiagnosticBuilder &Diag, VarDeclOrName VN) {
9676 return VN.VDecl ? Diag << VN.VDecl : Diag << VN.Name;
9679 } // end anonymous namespace
9681 QualType Sema::deduceVarTypeFromInitializer(VarDecl *VDecl,
9682 DeclarationName Name, QualType Type,
9683 TypeSourceInfo *TSI,
9684 SourceRange Range, bool DirectInit,
9686 bool IsInitCapture = !VDecl;
9687 assert((!VDecl || !VDecl->isInitCapture()) &&
9688 "init captures are expected to be deduced prior to initialization");
9690 VarDeclOrName VN{VDecl, Name};
9692 ArrayRef<Expr *> DeduceInits = Init;
9694 if (auto *PL = dyn_cast<ParenListExpr>(Init))
9695 DeduceInits = PL->exprs();
9696 else if (auto *IL = dyn_cast<InitListExpr>(Init))
9697 DeduceInits = IL->inits();
9700 // Deduction only works if we have exactly one source expression.
9701 if (DeduceInits.empty()) {
9702 // It isn't possible to write this directly, but it is possible to
9703 // end up in this situation with "auto x(some_pack...);"
9704 Diag(Init->getLocStart(), IsInitCapture
9705 ? diag::err_init_capture_no_expression
9706 : diag::err_auto_var_init_no_expression)
9707 << VN << Type << Range;
9711 if (DeduceInits.size() > 1) {
9712 Diag(DeduceInits[1]->getLocStart(),
9713 IsInitCapture ? diag::err_init_capture_multiple_expressions
9714 : diag::err_auto_var_init_multiple_expressions)
9715 << VN << Type << Range;
9719 Expr *DeduceInit = DeduceInits[0];
9720 if (DirectInit && isa<InitListExpr>(DeduceInit)) {
9721 Diag(Init->getLocStart(), IsInitCapture
9722 ? diag::err_init_capture_paren_braces
9723 : diag::err_auto_var_init_paren_braces)
9724 << isa<InitListExpr>(Init) << VN << Type << Range;
9728 // Expressions default to 'id' when we're in a debugger.
9729 bool DefaultedAnyToId = false;
9730 if (getLangOpts().DebuggerCastResultToId &&
9731 Init->getType() == Context.UnknownAnyTy && !IsInitCapture) {
9732 ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType());
9733 if (Result.isInvalid()) {
9736 Init = Result.get();
9737 DefaultedAnyToId = true;
9740 // C++ [dcl.decomp]p1:
9741 // If the assignment-expression [...] has array type A and no ref-qualifier
9742 // is present, e has type cv A
9743 if (VDecl && isa<DecompositionDecl>(VDecl) &&
9744 Context.hasSameUnqualifiedType(Type, Context.getAutoDeductType()) &&
9745 DeduceInit->getType()->isConstantArrayType())
9746 return Context.getQualifiedType(DeduceInit->getType(),
9747 Type.getQualifiers());
9749 QualType DeducedType;
9750 if (DeduceAutoType(TSI, DeduceInit, DeducedType) == DAR_Failed) {
9752 DiagnoseAutoDeductionFailure(VDecl, DeduceInit);
9753 else if (isa<InitListExpr>(Init))
9754 Diag(Range.getBegin(),
9755 diag::err_init_capture_deduction_failure_from_init_list)
9757 << (DeduceInit->getType().isNull() ? TSI->getType()
9758 : DeduceInit->getType())
9759 << DeduceInit->getSourceRange();
9761 Diag(Range.getBegin(), diag::err_init_capture_deduction_failure)
9762 << VN << TSI->getType()
9763 << (DeduceInit->getType().isNull() ? TSI->getType()
9764 : DeduceInit->getType())
9765 << DeduceInit->getSourceRange();
9768 // Warn if we deduced 'id'. 'auto' usually implies type-safety, but using
9769 // 'id' instead of a specific object type prevents most of our usual
9771 // We only want to warn outside of template instantiations, though:
9772 // inside a template, the 'id' could have come from a parameter.
9773 if (ActiveTemplateInstantiations.empty() && !DefaultedAnyToId &&
9774 !IsInitCapture && !DeducedType.isNull() && DeducedType->isObjCIdType()) {
9775 SourceLocation Loc = TSI->getTypeLoc().getBeginLoc();
9776 Diag(Loc, diag::warn_auto_var_is_id) << VN << Range;
9782 /// AddInitializerToDecl - Adds the initializer Init to the
9783 /// declaration dcl. If DirectInit is true, this is C++ direct
9784 /// initialization rather than copy initialization.
9785 void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init,
9786 bool DirectInit, bool TypeMayContainAuto) {
9787 // If there is no declaration, there was an error parsing it. Just ignore
9789 if (!RealDecl || RealDecl->isInvalidDecl()) {
9790 CorrectDelayedTyposInExpr(Init, dyn_cast_or_null<VarDecl>(RealDecl));
9794 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) {
9795 // Pure-specifiers are handled in ActOnPureSpecifier.
9796 Diag(Method->getLocation(), diag::err_member_function_initialization)
9797 << Method->getDeclName() << Init->getSourceRange();
9798 Method->setInvalidDecl();
9802 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl);
9804 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here");
9805 Diag(RealDecl->getLocation(), diag::err_illegal_initializer);
9806 RealDecl->setInvalidDecl();
9810 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for.
9811 if (TypeMayContainAuto && VDecl->getType()->isUndeducedType()) {
9812 // Attempt typo correction early so that the type of the init expression can
9813 // be deduced based on the chosen correction if the original init contains a
9815 ExprResult Res = CorrectDelayedTyposInExpr(Init, VDecl);
9816 if (!Res.isUsable()) {
9817 RealDecl->setInvalidDecl();
9822 QualType DeducedType = deduceVarTypeFromInitializer(
9823 VDecl, VDecl->getDeclName(), VDecl->getType(),
9824 VDecl->getTypeSourceInfo(), VDecl->getSourceRange(), DirectInit, Init);
9825 if (DeducedType.isNull()) {
9826 RealDecl->setInvalidDecl();
9830 VDecl->setType(DeducedType);
9831 assert(VDecl->isLinkageValid());
9833 // In ARC, infer lifetime.
9834 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(VDecl))
9835 VDecl->setInvalidDecl();
9837 // If this is a redeclaration, check that the type we just deduced matches
9838 // the previously declared type.
9839 if (VarDecl *Old = VDecl->getPreviousDecl()) {
9840 // We never need to merge the type, because we cannot form an incomplete
9841 // array of auto, nor deduce such a type.
9842 MergeVarDeclTypes(VDecl, Old, /*MergeTypeWithPrevious*/ false);
9845 // Check the deduced type is valid for a variable declaration.
9846 CheckVariableDeclarationType(VDecl);
9847 if (VDecl->isInvalidDecl())
9851 // dllimport cannot be used on variable definitions.
9852 if (VDecl->hasAttr<DLLImportAttr>() && !VDecl->isStaticDataMember()) {
9853 Diag(VDecl->getLocation(), diag::err_attribute_dllimport_data_definition);
9854 VDecl->setInvalidDecl();
9858 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) {
9859 // C99 6.7.8p5. C++ has no such restriction, but that is a defect.
9860 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init);
9861 VDecl->setInvalidDecl();
9865 if (!VDecl->getType()->isDependentType()) {
9866 // A definition must end up with a complete type, which means it must be
9867 // complete with the restriction that an array type might be completed by
9868 // the initializer; note that later code assumes this restriction.
9869 QualType BaseDeclType = VDecl->getType();
9870 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType))
9871 BaseDeclType = Array->getElementType();
9872 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType,
9873 diag::err_typecheck_decl_incomplete_type)) {
9874 RealDecl->setInvalidDecl();
9878 // The variable can not have an abstract class type.
9879 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(),
9880 diag::err_abstract_type_in_decl,
9881 AbstractVariableType))
9882 VDecl->setInvalidDecl();
9885 // If adding the initializer will turn this declaration into a definition,
9886 // and we already have a definition for this variable, diagnose or otherwise
9887 // handle the situation.
9889 if ((Def = VDecl->getDefinition()) && Def != VDecl &&
9890 (!VDecl->isStaticDataMember() || VDecl->isOutOfLine()) &&
9891 !VDecl->isThisDeclarationADemotedDefinition() &&
9892 checkVarDeclRedefinition(Def, VDecl))
9895 if (getLangOpts().CPlusPlus) {
9896 // C++ [class.static.data]p4
9897 // If a static data member is of const integral or const
9898 // enumeration type, its declaration in the class definition can
9899 // specify a constant-initializer which shall be an integral
9900 // constant expression (5.19). In that case, the member can appear
9901 // in integral constant expressions. The member shall still be
9902 // defined in a namespace scope if it is used in the program and the
9903 // namespace scope definition shall not contain an initializer.
9905 // We already performed a redefinition check above, but for static
9906 // data members we also need to check whether there was an in-class
9907 // declaration with an initializer.
9908 if (VDecl->isStaticDataMember() && VDecl->getCanonicalDecl()->hasInit()) {
9909 Diag(Init->getExprLoc(), diag::err_static_data_member_reinitialization)
9910 << VDecl->getDeclName();
9911 Diag(VDecl->getCanonicalDecl()->getInit()->getExprLoc(),
9912 diag::note_previous_initializer)
9917 if (VDecl->hasLocalStorage())
9918 getCurFunction()->setHasBranchProtectedScope();
9920 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) {
9921 VDecl->setInvalidDecl();
9926 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside
9927 // a kernel function cannot be initialized."
9928 if (VDecl->getType().getAddressSpace() == LangAS::opencl_local) {
9929 Diag(VDecl->getLocation(), diag::err_local_cant_init);
9930 VDecl->setInvalidDecl();
9934 // Get the decls type and save a reference for later, since
9935 // CheckInitializerTypes may change it.
9936 QualType DclT = VDecl->getType(), SavT = DclT;
9938 // Expressions default to 'id' when we're in a debugger
9939 // and we are assigning it to a variable of Objective-C pointer type.
9940 if (getLangOpts().DebuggerCastResultToId && DclT->isObjCObjectPointerType() &&
9941 Init->getType() == Context.UnknownAnyTy) {
9942 ExprResult Result = forceUnknownAnyToType(Init, Context.getObjCIdType());
9943 if (Result.isInvalid()) {
9944 VDecl->setInvalidDecl();
9947 Init = Result.get();
9950 // Perform the initialization.
9951 ParenListExpr *CXXDirectInit = dyn_cast<ParenListExpr>(Init);
9952 if (!VDecl->isInvalidDecl()) {
9953 // Handle errors like: int a({0})
9954 if (CXXDirectInit && CXXDirectInit->getNumExprs() == 1 &&
9955 !canInitializeWithParenthesizedList(VDecl->getType()))
9956 if (auto IList = dyn_cast<InitListExpr>(CXXDirectInit->getExpr(0))) {
9957 Diag(VDecl->getLocation(), diag::err_list_init_in_parens)
9958 << VDecl->getType() << CXXDirectInit->getSourceRange()
9959 << FixItHint::CreateRemoval(CXXDirectInit->getLocStart())
9960 << FixItHint::CreateRemoval(CXXDirectInit->getLocEnd());
9962 CXXDirectInit = nullptr;
9965 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl);
9966 InitializationKind Kind =
9969 ? InitializationKind::CreateDirect(VDecl->getLocation(),
9970 Init->getLocStart(),
9972 : InitializationKind::CreateDirectList(VDecl->getLocation())
9973 : InitializationKind::CreateCopy(VDecl->getLocation(),
9974 Init->getLocStart());
9976 MultiExprArg Args = Init;
9978 Args = MultiExprArg(CXXDirectInit->getExprs(),
9979 CXXDirectInit->getNumExprs());
9981 // Try to correct any TypoExprs in the initialization arguments.
9982 for (size_t Idx = 0; Idx < Args.size(); ++Idx) {
9983 ExprResult Res = CorrectDelayedTyposInExpr(
9984 Args[Idx], VDecl, [this, Entity, Kind](Expr *E) {
9985 InitializationSequence Init(*this, Entity, Kind, MultiExprArg(E));
9986 return Init.Failed() ? ExprError() : E;
9988 if (Res.isInvalid()) {
9989 VDecl->setInvalidDecl();
9990 } else if (Res.get() != Args[Idx]) {
9991 Args[Idx] = Res.get();
9994 if (VDecl->isInvalidDecl())
9997 InitializationSequence InitSeq(*this, Entity, Kind, Args,
9998 /*TopLevelOfInitList=*/false,
9999 /*TreatUnavailableAsInvalid=*/false);
10000 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Args, &DclT);
10001 if (Result.isInvalid()) {
10002 VDecl->setInvalidDecl();
10006 Init = Result.getAs<Expr>();
10009 // Check for self-references within variable initializers.
10010 // Variables declared within a function/method body (except for references)
10011 // are handled by a dataflow analysis.
10012 if (!VDecl->hasLocalStorage() || VDecl->getType()->isRecordType() ||
10013 VDecl->getType()->isReferenceType()) {
10014 CheckSelfReference(*this, RealDecl, Init, DirectInit);
10017 // If the type changed, it means we had an incomplete type that was
10018 // completed by the initializer. For example:
10019 // int ary[] = { 1, 3, 5 };
10020 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType.
10021 if (!VDecl->isInvalidDecl() && (DclT != SavT))
10022 VDecl->setType(DclT);
10024 if (!VDecl->isInvalidDecl()) {
10025 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init);
10027 if (VDecl->hasAttr<BlocksAttr>())
10028 checkRetainCycles(VDecl, Init);
10030 // It is safe to assign a weak reference into a strong variable.
10031 // Although this code can still have problems:
10032 // id x = self.weakProp;
10033 // id y = self.weakProp;
10034 // we do not warn to warn spuriously when 'x' and 'y' are on separate
10035 // paths through the function. This should be revisited if
10036 // -Wrepeated-use-of-weak is made flow-sensitive.
10037 if (VDecl->getType().getObjCLifetime() == Qualifiers::OCL_Strong &&
10038 !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak,
10039 Init->getLocStart()))
10040 getCurFunction()->markSafeWeakUse(Init);
10043 // The initialization is usually a full-expression.
10045 // FIXME: If this is a braced initialization of an aggregate, it is not
10046 // an expression, and each individual field initializer is a separate
10047 // full-expression. For instance, in:
10049 // struct Temp { ~Temp(); };
10050 // struct S { S(Temp); };
10051 // struct T { S a, b; } t = { Temp(), Temp() }
10053 // we should destroy the first Temp before constructing the second.
10054 ExprResult Result = ActOnFinishFullExpr(Init, VDecl->getLocation(),
10056 VDecl->isConstexpr());
10057 if (Result.isInvalid()) {
10058 VDecl->setInvalidDecl();
10061 Init = Result.get();
10063 // Attach the initializer to the decl.
10064 VDecl->setInit(Init);
10066 if (VDecl->isLocalVarDecl()) {
10067 // C99 6.7.8p4: All the expressions in an initializer for an object that has
10068 // static storage duration shall be constant expressions or string literals.
10069 // C++ does not have this restriction.
10070 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl()) {
10071 const Expr *Culprit;
10072 if (VDecl->getStorageClass() == SC_Static)
10073 CheckForConstantInitializer(Init, DclT);
10074 // C89 is stricter than C99 for non-static aggregate types.
10075 // C89 6.5.7p3: All the expressions [...] in an initializer list
10076 // for an object that has aggregate or union type shall be
10077 // constant expressions.
10078 else if (!getLangOpts().C99 && VDecl->getType()->isAggregateType() &&
10079 isa<InitListExpr>(Init) &&
10080 !Init->isConstantInitializer(Context, false, &Culprit))
10081 Diag(Culprit->getExprLoc(),
10082 diag::ext_aggregate_init_not_constant)
10083 << Culprit->getSourceRange();
10085 } else if (VDecl->isStaticDataMember() && !VDecl->isInline() &&
10086 VDecl->getLexicalDeclContext()->isRecord()) {
10087 // This is an in-class initialization for a static data member, e.g.,
10090 // static const int value = 17;
10093 // C++ [class.mem]p4:
10094 // A member-declarator can contain a constant-initializer only
10095 // if it declares a static member (9.4) of const integral or
10096 // const enumeration type, see 9.4.2.
10098 // C++11 [class.static.data]p3:
10099 // If a non-volatile non-inline const static data member is of integral
10100 // or enumeration type, its declaration in the class definition can
10101 // specify a brace-or-equal-initializer in which every initalizer-clause
10102 // that is an assignment-expression is a constant expression. A static
10103 // data member of literal type can be declared in the class definition
10104 // with the constexpr specifier; if so, its declaration shall specify a
10105 // brace-or-equal-initializer in which every initializer-clause that is
10106 // an assignment-expression is a constant expression.
10108 // Do nothing on dependent types.
10109 if (DclT->isDependentType()) {
10111 // Allow any 'static constexpr' members, whether or not they are of literal
10112 // type. We separately check that every constexpr variable is of literal
10114 } else if (VDecl->isConstexpr()) {
10116 // Require constness.
10117 } else if (!DclT.isConstQualified()) {
10118 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const)
10119 << Init->getSourceRange();
10120 VDecl->setInvalidDecl();
10122 // We allow integer constant expressions in all cases.
10123 } else if (DclT->isIntegralOrEnumerationType()) {
10124 // Check whether the expression is a constant expression.
10125 SourceLocation Loc;
10126 if (getLangOpts().CPlusPlus11 && DclT.isVolatileQualified())
10127 // In C++11, a non-constexpr const static data member with an
10128 // in-class initializer cannot be volatile.
10129 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile);
10130 else if (Init->isValueDependent())
10131 ; // Nothing to check.
10132 else if (Init->isIntegerConstantExpr(Context, &Loc))
10133 ; // Ok, it's an ICE!
10134 else if (Init->isEvaluatable(Context)) {
10135 // If we can constant fold the initializer through heroics, accept it,
10136 // but report this as a use of an extension for -pedantic.
10137 Diag(Loc, diag::ext_in_class_initializer_non_constant)
10138 << Init->getSourceRange();
10140 // Otherwise, this is some crazy unknown case. Report the issue at the
10141 // location provided by the isIntegerConstantExpr failed check.
10142 Diag(Loc, diag::err_in_class_initializer_non_constant)
10143 << Init->getSourceRange();
10144 VDecl->setInvalidDecl();
10147 // We allow foldable floating-point constants as an extension.
10148 } else if (DclT->isFloatingType()) { // also permits complex, which is ok
10149 // In C++98, this is a GNU extension. In C++11, it is not, but we support
10150 // it anyway and provide a fixit to add the 'constexpr'.
10151 if (getLangOpts().CPlusPlus11) {
10152 Diag(VDecl->getLocation(),
10153 diag::ext_in_class_initializer_float_type_cxx11)
10154 << DclT << Init->getSourceRange();
10155 Diag(VDecl->getLocStart(),
10156 diag::note_in_class_initializer_float_type_cxx11)
10157 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr ");
10159 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type)
10160 << DclT << Init->getSourceRange();
10162 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) {
10163 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant)
10164 << Init->getSourceRange();
10165 VDecl->setInvalidDecl();
10169 // Suggest adding 'constexpr' in C++11 for literal types.
10170 } else if (getLangOpts().CPlusPlus11 && DclT->isLiteralType(Context)) {
10171 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type)
10172 << DclT << Init->getSourceRange()
10173 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr ");
10174 VDecl->setConstexpr(true);
10177 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type)
10178 << DclT << Init->getSourceRange();
10179 VDecl->setInvalidDecl();
10181 } else if (VDecl->isFileVarDecl()) {
10182 // In C, extern is typically used to avoid tentative definitions when
10183 // declaring variables in headers, but adding an intializer makes it a
10184 // defintion. This is somewhat confusing, so GCC and Clang both warn on it.
10185 // In C++, extern is often used to give implictly static const variables
10186 // external linkage, so don't warn in that case. If selectany is present,
10187 // this might be header code intended for C and C++ inclusion, so apply the
10189 if (VDecl->getStorageClass() == SC_Extern &&
10190 ((!getLangOpts().CPlusPlus && !VDecl->hasAttr<SelectAnyAttr>()) ||
10191 !Context.getBaseElementType(VDecl->getType()).isConstQualified()) &&
10192 !(getLangOpts().CPlusPlus && VDecl->isExternC()) &&
10193 !isTemplateInstantiation(VDecl->getTemplateSpecializationKind()))
10194 Diag(VDecl->getLocation(), diag::warn_extern_init);
10196 // C99 6.7.8p4. All file scoped initializers need to be constant.
10197 if (!getLangOpts().CPlusPlus && !VDecl->isInvalidDecl())
10198 CheckForConstantInitializer(Init, DclT);
10201 // We will represent direct-initialization similarly to copy-initialization:
10202 // int x(1); -as-> int x = 1;
10203 // ClassType x(a,b,c); -as-> ClassType x = ClassType(a,b,c);
10205 // Clients that want to distinguish between the two forms, can check for
10206 // direct initializer using VarDecl::getInitStyle().
10207 // A major benefit is that clients that don't particularly care about which
10208 // exactly form was it (like the CodeGen) can handle both cases without
10209 // special case code.
10212 // The form of initialization (using parentheses or '=') is generally
10213 // insignificant, but does matter when the entity being initialized has a
10215 if (CXXDirectInit) {
10216 assert(DirectInit && "Call-style initializer must be direct init.");
10217 VDecl->setInitStyle(VarDecl::CallInit);
10218 } else if (DirectInit) {
10219 // This must be list-initialization. No other way is direct-initialization.
10220 VDecl->setInitStyle(VarDecl::ListInit);
10223 CheckCompleteVariableDeclaration(VDecl);
10226 /// ActOnInitializerError - Given that there was an error parsing an
10227 /// initializer for the given declaration, try to return to some form
10229 void Sema::ActOnInitializerError(Decl *D) {
10230 // Our main concern here is re-establishing invariants like "a
10231 // variable's type is either dependent or complete".
10232 if (!D || D->isInvalidDecl()) return;
10234 VarDecl *VD = dyn_cast<VarDecl>(D);
10237 // Bindings are not usable if we can't make sense of the initializer.
10238 if (auto *DD = dyn_cast<DecompositionDecl>(D))
10239 for (auto *BD : DD->bindings())
10240 BD->setInvalidDecl();
10242 // Auto types are meaningless if we can't make sense of the initializer.
10243 if (ParsingInitForAutoVars.count(D)) {
10244 D->setInvalidDecl();
10248 QualType Ty = VD->getType();
10249 if (Ty->isDependentType()) return;
10251 // Require a complete type.
10252 if (RequireCompleteType(VD->getLocation(),
10253 Context.getBaseElementType(Ty),
10254 diag::err_typecheck_decl_incomplete_type)) {
10255 VD->setInvalidDecl();
10259 // Require a non-abstract type.
10260 if (RequireNonAbstractType(VD->getLocation(), Ty,
10261 diag::err_abstract_type_in_decl,
10262 AbstractVariableType)) {
10263 VD->setInvalidDecl();
10267 // Don't bother complaining about constructors or destructors,
10271 /// Checks if an object of the given type can be initialized with parenthesized
10274 /// \param TargetType Type of object being initialized.
10276 /// The function is used to detect wrong initializations, such as 'int({0})'.
10278 bool Sema::canInitializeWithParenthesizedList(QualType TargetType) {
10279 return TargetType->isDependentType() || TargetType->isRecordType() ||
10280 TargetType->getContainedAutoType();
10283 void Sema::ActOnUninitializedDecl(Decl *RealDecl,
10284 bool TypeMayContainAuto) {
10285 // If there is no declaration, there was an error parsing it. Just ignore it.
10289 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) {
10290 QualType Type = Var->getType();
10292 // C++1z [dcl.dcl]p1 grammar implies that an initializer is mandatory.
10293 if (isa<DecompositionDecl>(RealDecl)) {
10294 Diag(Var->getLocation(), diag::err_decomp_decl_requires_init) << Var;
10295 Var->setInvalidDecl();
10299 // C++11 [dcl.spec.auto]p3
10300 if (TypeMayContainAuto && Type->getContainedAutoType()) {
10301 Diag(Var->getLocation(), diag::err_auto_var_requires_init)
10302 << Var->getDeclName() << Type;
10303 Var->setInvalidDecl();
10307 // C++11 [class.static.data]p3: A static data member can be declared with
10308 // the constexpr specifier; if so, its declaration shall specify
10309 // a brace-or-equal-initializer.
10310 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to
10311 // the definition of a variable [...] or the declaration of a static data
10313 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition() &&
10314 !Var->isThisDeclarationADemotedDefinition()) {
10315 if (Var->isStaticDataMember()) {
10316 // C++1z removes the relevant rule; the in-class declaration is always
10317 // a definition there.
10318 if (!getLangOpts().CPlusPlus1z) {
10319 Diag(Var->getLocation(),
10320 diag::err_constexpr_static_mem_var_requires_init)
10321 << Var->getDeclName();
10322 Var->setInvalidDecl();
10326 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl);
10327 Var->setInvalidDecl();
10332 // C++ Concepts TS [dcl.spec.concept]p1: [...] A variable template
10333 // definition having the concept specifier is called a variable concept. A
10334 // concept definition refers to [...] a variable concept and its initializer.
10335 if (VarTemplateDecl *VTD = Var->getDescribedVarTemplate()) {
10336 if (VTD->isConcept()) {
10337 Diag(Var->getLocation(), diag::err_var_concept_not_initialized);
10338 Var->setInvalidDecl();
10343 // OpenCL v1.1 s6.5.3: variables declared in the constant address space must
10345 if (!Var->isInvalidDecl() &&
10346 Var->getType().getAddressSpace() == LangAS::opencl_constant &&
10347 Var->getStorageClass() != SC_Extern && !Var->getInit()) {
10348 Diag(Var->getLocation(), diag::err_opencl_constant_no_init);
10349 Var->setInvalidDecl();
10353 switch (Var->isThisDeclarationADefinition()) {
10354 case VarDecl::Definition:
10355 if (!Var->isStaticDataMember() || !Var->getAnyInitializer())
10358 // We have an out-of-line definition of a static data member
10359 // that has an in-class initializer, so we type-check this like
10364 case VarDecl::DeclarationOnly:
10365 // It's only a declaration.
10367 // Block scope. C99 6.7p7: If an identifier for an object is
10368 // declared with no linkage (C99 6.2.2p6), the type for the
10369 // object shall be complete.
10370 if (!Type->isDependentType() && Var->isLocalVarDecl() &&
10371 !Var->hasLinkage() && !Var->isInvalidDecl() &&
10372 RequireCompleteType(Var->getLocation(), Type,
10373 diag::err_typecheck_decl_incomplete_type))
10374 Var->setInvalidDecl();
10376 // Make sure that the type is not abstract.
10377 if (!Type->isDependentType() && !Var->isInvalidDecl() &&
10378 RequireNonAbstractType(Var->getLocation(), Type,
10379 diag::err_abstract_type_in_decl,
10380 AbstractVariableType))
10381 Var->setInvalidDecl();
10382 if (!Type->isDependentType() && !Var->isInvalidDecl() &&
10383 Var->getStorageClass() == SC_PrivateExtern) {
10384 Diag(Var->getLocation(), diag::warn_private_extern);
10385 Diag(Var->getLocation(), diag::note_private_extern);
10390 case VarDecl::TentativeDefinition:
10391 // File scope. C99 6.9.2p2: A declaration of an identifier for an
10392 // object that has file scope without an initializer, and without a
10393 // storage-class specifier or with the storage-class specifier "static",
10394 // constitutes a tentative definition. Note: A tentative definition with
10395 // external linkage is valid (C99 6.2.2p5).
10396 if (!Var->isInvalidDecl()) {
10397 if (const IncompleteArrayType *ArrayT
10398 = Context.getAsIncompleteArrayType(Type)) {
10399 if (RequireCompleteType(Var->getLocation(),
10400 ArrayT->getElementType(),
10401 diag::err_illegal_decl_array_incomplete_type))
10402 Var->setInvalidDecl();
10403 } else if (Var->getStorageClass() == SC_Static) {
10404 // C99 6.9.2p3: If the declaration of an identifier for an object is
10405 // a tentative definition and has internal linkage (C99 6.2.2p3), the
10406 // declared type shall not be an incomplete type.
10407 // NOTE: code such as the following
10408 // static struct s;
10409 // struct s { int a; };
10410 // is accepted by gcc. Hence here we issue a warning instead of
10411 // an error and we do not invalidate the static declaration.
10412 // NOTE: to avoid multiple warnings, only check the first declaration.
10413 if (Var->isFirstDecl())
10414 RequireCompleteType(Var->getLocation(), Type,
10415 diag::ext_typecheck_decl_incomplete_type);
10419 // Record the tentative definition; we're done.
10420 if (!Var->isInvalidDecl())
10421 TentativeDefinitions.push_back(Var);
10425 // Provide a specific diagnostic for uninitialized variable
10426 // definitions with incomplete array type.
10427 if (Type->isIncompleteArrayType()) {
10428 Diag(Var->getLocation(),
10429 diag::err_typecheck_incomplete_array_needs_initializer);
10430 Var->setInvalidDecl();
10434 // Provide a specific diagnostic for uninitialized variable
10435 // definitions with reference type.
10436 if (Type->isReferenceType()) {
10437 Diag(Var->getLocation(), diag::err_reference_var_requires_init)
10438 << Var->getDeclName()
10439 << SourceRange(Var->getLocation(), Var->getLocation());
10440 Var->setInvalidDecl();
10444 // Do not attempt to type-check the default initializer for a
10445 // variable with dependent type.
10446 if (Type->isDependentType())
10449 if (Var->isInvalidDecl())
10452 if (!Var->hasAttr<AliasAttr>()) {
10453 if (RequireCompleteType(Var->getLocation(),
10454 Context.getBaseElementType(Type),
10455 diag::err_typecheck_decl_incomplete_type)) {
10456 Var->setInvalidDecl();
10463 // The variable can not have an abstract class type.
10464 if (RequireNonAbstractType(Var->getLocation(), Type,
10465 diag::err_abstract_type_in_decl,
10466 AbstractVariableType)) {
10467 Var->setInvalidDecl();
10471 // Check for jumps past the implicit initializer. C++0x
10472 // clarifies that this applies to a "variable with automatic
10473 // storage duration", not a "local variable".
10474 // C++11 [stmt.dcl]p3
10475 // A program that jumps from a point where a variable with automatic
10476 // storage duration is not in scope to a point where it is in scope is
10477 // ill-formed unless the variable has scalar type, class type with a
10478 // trivial default constructor and a trivial destructor, a cv-qualified
10479 // version of one of these types, or an array of one of the preceding
10480 // types and is declared without an initializer.
10481 if (getLangOpts().CPlusPlus && Var->hasLocalStorage()) {
10482 if (const RecordType *Record
10483 = Context.getBaseElementType(Type)->getAs<RecordType>()) {
10484 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl());
10485 // Mark the function for further checking even if the looser rules of
10486 // C++11 do not require such checks, so that we can diagnose
10487 // incompatibilities with C++98.
10488 if (!CXXRecord->isPOD())
10489 getCurFunction()->setHasBranchProtectedScope();
10493 // C++03 [dcl.init]p9:
10494 // If no initializer is specified for an object, and the
10495 // object is of (possibly cv-qualified) non-POD class type (or
10496 // array thereof), the object shall be default-initialized; if
10497 // the object is of const-qualified type, the underlying class
10498 // type shall have a user-declared default
10499 // constructor. Otherwise, if no initializer is specified for
10500 // a non- static object, the object and its subobjects, if
10501 // any, have an indeterminate initial value); if the object
10502 // or any of its subobjects are of const-qualified type, the
10503 // program is ill-formed.
10504 // C++0x [dcl.init]p11:
10505 // If no initializer is specified for an object, the object is
10506 // default-initialized; [...].
10507 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var);
10508 InitializationKind Kind
10509 = InitializationKind::CreateDefault(Var->getLocation());
10511 InitializationSequence InitSeq(*this, Entity, Kind, None);
10512 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, None);
10513 if (Init.isInvalid())
10514 Var->setInvalidDecl();
10515 else if (Init.get()) {
10516 Var->setInit(MaybeCreateExprWithCleanups(Init.get()));
10517 // This is important for template substitution.
10518 Var->setInitStyle(VarDecl::CallInit);
10521 CheckCompleteVariableDeclaration(Var);
10525 void Sema::ActOnCXXForRangeDecl(Decl *D) {
10526 // If there is no declaration, there was an error parsing it. Ignore it.
10530 VarDecl *VD = dyn_cast<VarDecl>(D);
10532 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var);
10533 D->setInvalidDecl();
10537 VD->setCXXForRangeDecl(true);
10539 // for-range-declaration cannot be given a storage class specifier.
10541 switch (VD->getStorageClass()) {
10550 case SC_PrivateExtern:
10561 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class)
10562 << VD->getDeclName() << Error;
10563 D->setInvalidDecl();
10568 Sema::ActOnCXXForRangeIdentifier(Scope *S, SourceLocation IdentLoc,
10569 IdentifierInfo *Ident,
10570 ParsedAttributes &Attrs,
10571 SourceLocation AttrEnd) {
10572 // C++1y [stmt.iter]p1:
10573 // A range-based for statement of the form
10574 // for ( for-range-identifier : for-range-initializer ) statement
10575 // is equivalent to
10576 // for ( auto&& for-range-identifier : for-range-initializer ) statement
10577 DeclSpec DS(Attrs.getPool().getFactory());
10579 const char *PrevSpec;
10581 DS.SetTypeSpecType(DeclSpec::TST_auto, IdentLoc, PrevSpec, DiagID,
10582 getPrintingPolicy());
10584 Declarator D(DS, Declarator::ForContext);
10585 D.SetIdentifier(Ident, IdentLoc);
10586 D.takeAttributes(Attrs, AttrEnd);
10588 ParsedAttributes EmptyAttrs(Attrs.getPool().getFactory());
10589 D.AddTypeInfo(DeclaratorChunk::getReference(0, IdentLoc, /*lvalue*/false),
10590 EmptyAttrs, IdentLoc);
10591 Decl *Var = ActOnDeclarator(S, D);
10592 cast<VarDecl>(Var)->setCXXForRangeDecl(true);
10593 FinalizeDeclaration(Var);
10594 return ActOnDeclStmt(FinalizeDeclaratorGroup(S, DS, Var), IdentLoc,
10595 AttrEnd.isValid() ? AttrEnd : IdentLoc);
10598 void Sema::CheckCompleteVariableDeclaration(VarDecl *var) {
10599 if (var->isInvalidDecl()) return;
10601 if (getLangOpts().OpenCL) {
10602 // OpenCL v2.0 s6.12.5 - Every block variable declaration must have an
10604 if (var->getTypeSourceInfo()->getType()->isBlockPointerType() &&
10606 Diag(var->getLocation(), diag::err_opencl_invalid_block_declaration)
10608 var->setInvalidDecl();
10613 // In Objective-C, don't allow jumps past the implicit initialization of a
10614 // local retaining variable.
10615 if (getLangOpts().ObjC1 &&
10616 var->hasLocalStorage()) {
10617 switch (var->getType().getObjCLifetime()) {
10618 case Qualifiers::OCL_None:
10619 case Qualifiers::OCL_ExplicitNone:
10620 case Qualifiers::OCL_Autoreleasing:
10623 case Qualifiers::OCL_Weak:
10624 case Qualifiers::OCL_Strong:
10625 getCurFunction()->setHasBranchProtectedScope();
10630 // Warn about externally-visible variables being defined without a
10631 // prior declaration. We only want to do this for global
10632 // declarations, but we also specifically need to avoid doing it for
10633 // class members because the linkage of an anonymous class can
10634 // change if it's later given a typedef name.
10635 if (var->isThisDeclarationADefinition() &&
10636 var->getDeclContext()->getRedeclContext()->isFileContext() &&
10637 var->isExternallyVisible() && var->hasLinkage() &&
10638 !getDiagnostics().isIgnored(diag::warn_missing_variable_declarations,
10639 var->getLocation())) {
10640 // Find a previous declaration that's not a definition.
10641 VarDecl *prev = var->getPreviousDecl();
10642 while (prev && prev->isThisDeclarationADefinition())
10643 prev = prev->getPreviousDecl();
10646 Diag(var->getLocation(), diag::warn_missing_variable_declarations) << var;
10649 // Cache the result of checking for constant initialization.
10650 Optional<bool> CacheHasConstInit;
10651 const Expr *CacheCulprit;
10652 auto checkConstInit = [&]() mutable {
10653 if (!CacheHasConstInit)
10654 CacheHasConstInit = var->getInit()->isConstantInitializer(
10655 Context, var->getType()->isReferenceType(), &CacheCulprit);
10656 return *CacheHasConstInit;
10659 if (var->getTLSKind() == VarDecl::TLS_Static) {
10660 if (var->getType().isDestructedType()) {
10661 // GNU C++98 edits for __thread, [basic.start.term]p3:
10662 // The type of an object with thread storage duration shall not
10663 // have a non-trivial destructor.
10664 Diag(var->getLocation(), diag::err_thread_nontrivial_dtor);
10665 if (getLangOpts().CPlusPlus11)
10666 Diag(var->getLocation(), diag::note_use_thread_local);
10667 } else if (getLangOpts().CPlusPlus && var->hasInit()) {
10668 if (!checkConstInit()) {
10669 // GNU C++98 edits for __thread, [basic.start.init]p4:
10670 // An object of thread storage duration shall not require dynamic
10672 // FIXME: Need strict checking here.
10673 Diag(CacheCulprit->getExprLoc(), diag::err_thread_dynamic_init)
10674 << CacheCulprit->getSourceRange();
10675 if (getLangOpts().CPlusPlus11)
10676 Diag(var->getLocation(), diag::note_use_thread_local);
10681 // Apply section attributes and pragmas to global variables.
10682 bool GlobalStorage = var->hasGlobalStorage();
10683 if (GlobalStorage && var->isThisDeclarationADefinition() &&
10684 ActiveTemplateInstantiations.empty()) {
10685 PragmaStack<StringLiteral *> *Stack = nullptr;
10686 int SectionFlags = ASTContext::PSF_Implicit | ASTContext::PSF_Read;
10687 if (var->getType().isConstQualified())
10688 Stack = &ConstSegStack;
10689 else if (!var->getInit()) {
10690 Stack = &BSSSegStack;
10691 SectionFlags |= ASTContext::PSF_Write;
10693 Stack = &DataSegStack;
10694 SectionFlags |= ASTContext::PSF_Write;
10696 if (Stack->CurrentValue && !var->hasAttr<SectionAttr>()) {
10697 var->addAttr(SectionAttr::CreateImplicit(
10698 Context, SectionAttr::Declspec_allocate,
10699 Stack->CurrentValue->getString(), Stack->CurrentPragmaLocation));
10701 if (const SectionAttr *SA = var->getAttr<SectionAttr>())
10702 if (UnifySection(SA->getName(), SectionFlags, var))
10703 var->dropAttr<SectionAttr>();
10705 // Apply the init_seg attribute if this has an initializer. If the
10706 // initializer turns out to not be dynamic, we'll end up ignoring this
10708 if (CurInitSeg && var->getInit())
10709 var->addAttr(InitSegAttr::CreateImplicit(Context, CurInitSeg->getString(),
10713 // All the following checks are C++ only.
10714 if (!getLangOpts().CPlusPlus) {
10715 // If this variable must be emitted, add it as an initializer for the
10717 if (Context.DeclMustBeEmitted(var) && !ModuleScopes.empty())
10718 Context.addModuleInitializer(ModuleScopes.back().Module, var);
10722 if (auto *DD = dyn_cast<DecompositionDecl>(var))
10723 CheckCompleteDecompositionDeclaration(DD);
10725 QualType type = var->getType();
10726 if (type->isDependentType()) return;
10728 // __block variables might require us to capture a copy-initializer.
10729 if (var->hasAttr<BlocksAttr>()) {
10730 // It's currently invalid to ever have a __block variable with an
10731 // array type; should we diagnose that here?
10733 // Regardless, we don't want to ignore array nesting when
10734 // constructing this copy.
10735 if (type->isStructureOrClassType()) {
10736 EnterExpressionEvaluationContext scope(*this, PotentiallyEvaluated);
10737 SourceLocation poi = var->getLocation();
10738 Expr *varRef =new (Context) DeclRefExpr(var, false, type, VK_LValue, poi);
10740 = PerformMoveOrCopyInitialization(
10741 InitializedEntity::InitializeBlock(poi, type, false),
10742 var, var->getType(), varRef, /*AllowNRVO=*/true);
10743 if (!result.isInvalid()) {
10744 result = MaybeCreateExprWithCleanups(result);
10745 Expr *init = result.getAs<Expr>();
10746 Context.setBlockVarCopyInits(var, init);
10751 Expr *Init = var->getInit();
10752 bool IsGlobal = GlobalStorage && !var->isStaticLocal();
10753 QualType baseType = Context.getBaseElementType(type);
10755 if (!var->getDeclContext()->isDependentContext() &&
10756 Init && !Init->isValueDependent()) {
10758 if (var->isConstexpr()) {
10759 SmallVector<PartialDiagnosticAt, 8> Notes;
10760 if (!var->evaluateValue(Notes) || !var->isInitICE()) {
10761 SourceLocation DiagLoc = var->getLocation();
10762 // If the note doesn't add any useful information other than a source
10763 // location, fold it into the primary diagnostic.
10764 if (Notes.size() == 1 && Notes[0].second.getDiagID() ==
10765 diag::note_invalid_subexpr_in_const_expr) {
10766 DiagLoc = Notes[0].first;
10769 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init)
10770 << var << Init->getSourceRange();
10771 for (unsigned I = 0, N = Notes.size(); I != N; ++I)
10772 Diag(Notes[I].first, Notes[I].second);
10774 } else if (var->isUsableInConstantExpressions(Context)) {
10775 // Check whether the initializer of a const variable of integral or
10776 // enumeration type is an ICE now, since we can't tell whether it was
10777 // initialized by a constant expression if we check later.
10778 var->checkInitIsICE();
10781 // Don't emit further diagnostics about constexpr globals since they
10782 // were just diagnosed.
10783 if (!var->isConstexpr() && GlobalStorage &&
10784 var->hasAttr<RequireConstantInitAttr>()) {
10785 // FIXME: Need strict checking in C++03 here.
10786 bool DiagErr = getLangOpts().CPlusPlus11
10787 ? !var->checkInitIsICE() : !checkConstInit();
10789 auto attr = var->getAttr<RequireConstantInitAttr>();
10790 Diag(var->getLocation(), diag::err_require_constant_init_failed)
10791 << Init->getSourceRange();
10792 Diag(attr->getLocation(), diag::note_declared_required_constant_init_here)
10793 << attr->getRange();
10796 else if (!var->isConstexpr() && IsGlobal &&
10797 !getDiagnostics().isIgnored(diag::warn_global_constructor,
10798 var->getLocation())) {
10799 // Warn about globals which don't have a constant initializer. Don't
10800 // warn about globals with a non-trivial destructor because we already
10801 // warned about them.
10802 CXXRecordDecl *RD = baseType->getAsCXXRecordDecl();
10803 if (!(RD && !RD->hasTrivialDestructor())) {
10804 if (!checkConstInit())
10805 Diag(var->getLocation(), diag::warn_global_constructor)
10806 << Init->getSourceRange();
10811 // Require the destructor.
10812 if (const RecordType *recordType = baseType->getAs<RecordType>())
10813 FinalizeVarWithDestructor(var, recordType);
10815 // If this variable must be emitted, add it as an initializer for the current
10817 if (Context.DeclMustBeEmitted(var) && !ModuleScopes.empty())
10818 Context.addModuleInitializer(ModuleScopes.back().Module, var);
10821 /// \brief Determines if a variable's alignment is dependent.
10822 static bool hasDependentAlignment(VarDecl *VD) {
10823 if (VD->getType()->isDependentType())
10825 for (auto *I : VD->specific_attrs<AlignedAttr>())
10826 if (I->isAlignmentDependent())
10831 /// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform
10832 /// any semantic actions necessary after any initializer has been attached.
10834 Sema::FinalizeDeclaration(Decl *ThisDecl) {
10835 // Note that we are no longer parsing the initializer for this declaration.
10836 ParsingInitForAutoVars.erase(ThisDecl);
10838 VarDecl *VD = dyn_cast_or_null<VarDecl>(ThisDecl);
10842 if (auto *DD = dyn_cast<DecompositionDecl>(ThisDecl)) {
10843 for (auto *BD : DD->bindings()) {
10844 FinalizeDeclaration(BD);
10848 checkAttributesAfterMerging(*this, *VD);
10850 // Perform TLS alignment check here after attributes attached to the variable
10851 // which may affect the alignment have been processed. Only perform the check
10852 // if the target has a maximum TLS alignment (zero means no constraints).
10853 if (unsigned MaxAlign = Context.getTargetInfo().getMaxTLSAlign()) {
10854 // Protect the check so that it's not performed on dependent types and
10855 // dependent alignments (we can't determine the alignment in that case).
10856 if (VD->getTLSKind() && !hasDependentAlignment(VD)) {
10857 CharUnits MaxAlignChars = Context.toCharUnitsFromBits(MaxAlign);
10858 if (Context.getDeclAlign(VD) > MaxAlignChars) {
10859 Diag(VD->getLocation(), diag::err_tls_var_aligned_over_maximum)
10860 << (unsigned)Context.getDeclAlign(VD).getQuantity() << VD
10861 << (unsigned)MaxAlignChars.getQuantity();
10866 if (VD->isStaticLocal()) {
10867 if (FunctionDecl *FD =
10868 dyn_cast_or_null<FunctionDecl>(VD->getParentFunctionOrMethod())) {
10869 // Static locals inherit dll attributes from their function.
10870 if (Attr *A = getDLLAttr(FD)) {
10871 auto *NewAttr = cast<InheritableAttr>(A->clone(getASTContext()));
10872 NewAttr->setInherited(true);
10873 VD->addAttr(NewAttr);
10875 // CUDA E.2.9.4: Within the body of a __device__ or __global__
10876 // function, only __shared__ variables may be declared with
10877 // static storage class.
10878 if (getLangOpts().CUDA && !VD->hasAttr<CUDASharedAttr>() &&
10879 CUDADiagIfDeviceCode(VD->getLocation(),
10880 diag::err_device_static_local_var)
10881 << CurrentCUDATarget())
10882 VD->setInvalidDecl();
10886 // Perform check for initializers of device-side global variables.
10887 // CUDA allows empty constructors as initializers (see E.2.3.1, CUDA
10888 // 7.5). We must also apply the same checks to all __shared__
10889 // variables whether they are local or not. CUDA also allows
10890 // constant initializers for __constant__ and __device__ variables.
10891 if (getLangOpts().CUDA) {
10892 const Expr *Init = VD->getInit();
10893 if (Init && VD->hasGlobalStorage()) {
10894 if (VD->hasAttr<CUDADeviceAttr>() || VD->hasAttr<CUDAConstantAttr>() ||
10895 VD->hasAttr<CUDASharedAttr>()) {
10896 assert(!VD->isStaticLocal() || VD->hasAttr<CUDASharedAttr>());
10897 bool AllowedInit = false;
10898 if (const CXXConstructExpr *CE = dyn_cast<CXXConstructExpr>(Init))
10900 isEmptyCudaConstructor(VD->getLocation(), CE->getConstructor());
10901 // We'll allow constant initializers even if it's a non-empty
10902 // constructor according to CUDA rules. This deviates from NVCC,
10903 // but allows us to handle things like constexpr constructors.
10904 if (!AllowedInit &&
10905 (VD->hasAttr<CUDADeviceAttr>() || VD->hasAttr<CUDAConstantAttr>()))
10906 AllowedInit = VD->getInit()->isConstantInitializer(
10907 Context, VD->getType()->isReferenceType());
10909 // Also make sure that destructor, if there is one, is empty.
10911 if (CXXRecordDecl *RD = VD->getType()->getAsCXXRecordDecl())
10913 isEmptyCudaDestructor(VD->getLocation(), RD->getDestructor());
10915 if (!AllowedInit) {
10916 Diag(VD->getLocation(), VD->hasAttr<CUDASharedAttr>()
10917 ? diag::err_shared_var_init
10918 : diag::err_dynamic_var_init)
10919 << Init->getSourceRange();
10920 VD->setInvalidDecl();
10923 // This is a host-side global variable. Check that the initializer is
10924 // callable from the host side.
10925 const FunctionDecl *InitFn = nullptr;
10926 if (const CXXConstructExpr *CE = dyn_cast<CXXConstructExpr>(Init)) {
10927 InitFn = CE->getConstructor();
10928 } else if (const CallExpr *CE = dyn_cast<CallExpr>(Init)) {
10929 InitFn = CE->getDirectCallee();
10932 CUDAFunctionTarget InitFnTarget = IdentifyCUDATarget(InitFn);
10933 if (InitFnTarget != CFT_Host && InitFnTarget != CFT_HostDevice) {
10934 Diag(VD->getLocation(), diag::err_ref_bad_target_global_initializer)
10935 << InitFnTarget << InitFn;
10936 Diag(InitFn->getLocation(), diag::note_previous_decl) << InitFn;
10937 VD->setInvalidDecl();
10944 // Grab the dllimport or dllexport attribute off of the VarDecl.
10945 const InheritableAttr *DLLAttr = getDLLAttr(VD);
10947 // Imported static data members cannot be defined out-of-line.
10948 if (const auto *IA = dyn_cast_or_null<DLLImportAttr>(DLLAttr)) {
10949 if (VD->isStaticDataMember() && VD->isOutOfLine() &&
10950 VD->isThisDeclarationADefinition()) {
10951 // We allow definitions of dllimport class template static data members
10953 CXXRecordDecl *Context =
10954 cast<CXXRecordDecl>(VD->getFirstDecl()->getDeclContext());
10955 bool IsClassTemplateMember =
10956 isa<ClassTemplatePartialSpecializationDecl>(Context) ||
10957 Context->getDescribedClassTemplate();
10959 Diag(VD->getLocation(),
10960 IsClassTemplateMember
10961 ? diag::warn_attribute_dllimport_static_field_definition
10962 : diag::err_attribute_dllimport_static_field_definition);
10963 Diag(IA->getLocation(), diag::note_attribute);
10964 if (!IsClassTemplateMember)
10965 VD->setInvalidDecl();
10969 // dllimport/dllexport variables cannot be thread local, their TLS index
10970 // isn't exported with the variable.
10971 if (DLLAttr && VD->getTLSKind()) {
10972 auto *F = dyn_cast_or_null<FunctionDecl>(VD->getParentFunctionOrMethod());
10973 if (F && getDLLAttr(F)) {
10974 assert(VD->isStaticLocal());
10975 // But if this is a static local in a dlimport/dllexport function, the
10976 // function will never be inlined, which means the var would never be
10977 // imported, so having it marked import/export is safe.
10979 Diag(VD->getLocation(), diag::err_attribute_dll_thread_local) << VD
10981 VD->setInvalidDecl();
10985 if (UsedAttr *Attr = VD->getAttr<UsedAttr>()) {
10986 if (!Attr->isInherited() && !VD->isThisDeclarationADefinition()) {
10987 Diag(Attr->getLocation(), diag::warn_attribute_ignored) << Attr;
10988 VD->dropAttr<UsedAttr>();
10992 const DeclContext *DC = VD->getDeclContext();
10993 // If there's a #pragma GCC visibility in scope, and this isn't a class
10994 // member, set the visibility of this variable.
10995 if (DC->getRedeclContext()->isFileContext() && VD->isExternallyVisible())
10996 AddPushedVisibilityAttribute(VD);
10998 // FIXME: Warn on unused templates.
10999 if (VD->isFileVarDecl() && !VD->getDescribedVarTemplate() &&
11000 !isa<VarTemplatePartialSpecializationDecl>(VD))
11001 MarkUnusedFileScopedDecl(VD);
11003 // Now we have parsed the initializer and can update the table of magic
11005 if (!VD->hasAttr<TypeTagForDatatypeAttr>() ||
11006 !VD->getType()->isIntegralOrEnumerationType())
11009 for (const auto *I : ThisDecl->specific_attrs<TypeTagForDatatypeAttr>()) {
11010 const Expr *MagicValueExpr = VD->getInit();
11011 if (!MagicValueExpr) {
11014 llvm::APSInt MagicValueInt;
11015 if (!MagicValueExpr->isIntegerConstantExpr(MagicValueInt, Context)) {
11016 Diag(I->getRange().getBegin(),
11017 diag::err_type_tag_for_datatype_not_ice)
11018 << LangOpts.CPlusPlus << MagicValueExpr->getSourceRange();
11021 if (MagicValueInt.getActiveBits() > 64) {
11022 Diag(I->getRange().getBegin(),
11023 diag::err_type_tag_for_datatype_too_large)
11024 << LangOpts.CPlusPlus << MagicValueExpr->getSourceRange();
11027 uint64_t MagicValue = MagicValueInt.getZExtValue();
11028 RegisterTypeTagForDatatype(I->getArgumentKind(),
11030 I->getMatchingCType(),
11031 I->getLayoutCompatible(),
11032 I->getMustBeNull());
11036 Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS,
11037 ArrayRef<Decl *> Group) {
11038 SmallVector<Decl*, 8> Decls;
11040 if (DS.isTypeSpecOwned())
11041 Decls.push_back(DS.getRepAsDecl());
11043 DeclaratorDecl *FirstDeclaratorInGroup = nullptr;
11044 DecompositionDecl *FirstDecompDeclaratorInGroup = nullptr;
11045 bool DiagnosedMultipleDecomps = false;
11047 for (unsigned i = 0, e = Group.size(); i != e; ++i) {
11048 if (Decl *D = Group[i]) {
11049 auto *DD = dyn_cast<DeclaratorDecl>(D);
11050 if (DD && !FirstDeclaratorInGroup)
11051 FirstDeclaratorInGroup = DD;
11053 auto *Decomp = dyn_cast<DecompositionDecl>(D);
11054 if (Decomp && !FirstDecompDeclaratorInGroup)
11055 FirstDecompDeclaratorInGroup = Decomp;
11057 // A decomposition declaration cannot be combined with any other
11058 // declaration in the same group.
11059 auto *OtherDD = FirstDeclaratorInGroup;
11060 if (OtherDD == FirstDecompDeclaratorInGroup)
11062 if (OtherDD && FirstDecompDeclaratorInGroup &&
11063 OtherDD != FirstDecompDeclaratorInGroup &&
11064 !DiagnosedMultipleDecomps) {
11065 Diag(FirstDecompDeclaratorInGroup->getLocation(),
11066 diag::err_decomp_decl_not_alone)
11067 << OtherDD->getSourceRange();
11068 DiagnosedMultipleDecomps = true;
11071 Decls.push_back(D);
11075 if (DeclSpec::isDeclRep(DS.getTypeSpecType())) {
11076 if (TagDecl *Tag = dyn_cast_or_null<TagDecl>(DS.getRepAsDecl())) {
11077 handleTagNumbering(Tag, S);
11078 if (FirstDeclaratorInGroup && !Tag->hasNameForLinkage() &&
11079 getLangOpts().CPlusPlus)
11080 Context.addDeclaratorForUnnamedTagDecl(Tag, FirstDeclaratorInGroup);
11084 return BuildDeclaratorGroup(Decls, DS.containsPlaceholderType());
11087 /// BuildDeclaratorGroup - convert a list of declarations into a declaration
11088 /// group, performing any necessary semantic checking.
11089 Sema::DeclGroupPtrTy
11090 Sema::BuildDeclaratorGroup(MutableArrayRef<Decl *> Group,
11091 bool TypeMayContainAuto) {
11092 // C++0x [dcl.spec.auto]p7:
11093 // If the type deduced for the template parameter U is not the same in each
11094 // deduction, the program is ill-formed.
11095 // FIXME: When initializer-list support is added, a distinction is needed
11096 // between the deduced type U and the deduced type which 'auto' stands for.
11097 // auto a = 0, b = { 1, 2, 3 };
11098 // is legal because the deduced type U is 'int' in both cases.
11099 if (TypeMayContainAuto && Group.size() > 1) {
11101 CanQualType DeducedCanon;
11102 VarDecl *DeducedDecl = nullptr;
11103 for (unsigned i = 0, e = Group.size(); i != e; ++i) {
11104 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) {
11105 AutoType *AT = D->getType()->getContainedAutoType();
11106 // Don't reissue diagnostics when instantiating a template.
11107 if (AT && D->isInvalidDecl())
11109 QualType U = AT ? AT->getDeducedType() : QualType();
11111 CanQualType UCanon = Context.getCanonicalType(U);
11112 if (Deduced.isNull()) {
11114 DeducedCanon = UCanon;
11116 } else if (DeducedCanon != UCanon) {
11117 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(),
11118 diag::err_auto_different_deductions)
11119 << (unsigned)AT->getKeyword()
11120 << Deduced << DeducedDecl->getDeclName()
11121 << U << D->getDeclName()
11122 << DeducedDecl->getInit()->getSourceRange()
11123 << D->getInit()->getSourceRange();
11124 D->setInvalidDecl();
11132 ActOnDocumentableDecls(Group);
11134 return DeclGroupPtrTy::make(
11135 DeclGroupRef::Create(Context, Group.data(), Group.size()));
11138 void Sema::ActOnDocumentableDecl(Decl *D) {
11139 ActOnDocumentableDecls(D);
11142 void Sema::ActOnDocumentableDecls(ArrayRef<Decl *> Group) {
11143 // Don't parse the comment if Doxygen diagnostics are ignored.
11144 if (Group.empty() || !Group[0])
11147 if (Diags.isIgnored(diag::warn_doc_param_not_found,
11148 Group[0]->getLocation()) &&
11149 Diags.isIgnored(diag::warn_unknown_comment_command_name,
11150 Group[0]->getLocation()))
11153 if (Group.size() >= 2) {
11154 // This is a decl group. Normally it will contain only declarations
11155 // produced from declarator list. But in case we have any definitions or
11156 // additional declaration references:
11157 // 'typedef struct S {} S;'
11158 // 'typedef struct S *S;'
11160 // FinalizeDeclaratorGroup adds these as separate declarations.
11161 Decl *MaybeTagDecl = Group[0];
11162 if (MaybeTagDecl && isa<TagDecl>(MaybeTagDecl)) {
11163 Group = Group.slice(1);
11167 // See if there are any new comments that are not attached to a decl.
11168 ArrayRef<RawComment *> Comments = Context.getRawCommentList().getComments();
11169 if (!Comments.empty() &&
11170 !Comments.back()->isAttached()) {
11171 // There is at least one comment that not attached to a decl.
11172 // Maybe it should be attached to one of these decls?
11174 // Note that this way we pick up not only comments that precede the
11175 // declaration, but also comments that *follow* the declaration -- thanks to
11176 // the lookahead in the lexer: we've consumed the semicolon and looked
11177 // ahead through comments.
11178 for (unsigned i = 0, e = Group.size(); i != e; ++i)
11179 Context.getCommentForDecl(Group[i], &PP);
11183 /// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator()
11184 /// to introduce parameters into function prototype scope.
11185 Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) {
11186 const DeclSpec &DS = D.getDeclSpec();
11188 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'.
11190 // C++03 [dcl.stc]p2 also permits 'auto'.
11191 StorageClass SC = SC_None;
11192 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) {
11194 } else if (getLangOpts().CPlusPlus &&
11195 DS.getStorageClassSpec() == DeclSpec::SCS_auto) {
11197 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) {
11198 Diag(DS.getStorageClassSpecLoc(),
11199 diag::err_invalid_storage_class_in_func_decl);
11200 D.getMutableDeclSpec().ClearStorageClassSpecs();
11203 if (DeclSpec::TSCS TSCS = DS.getThreadStorageClassSpec())
11204 Diag(DS.getThreadStorageClassSpecLoc(), diag::err_invalid_thread)
11205 << DeclSpec::getSpecifierName(TSCS);
11206 if (DS.isInlineSpecified())
11207 Diag(DS.getInlineSpecLoc(), diag::err_inline_non_function)
11208 << getLangOpts().CPlusPlus1z;
11209 if (DS.isConstexprSpecified())
11210 Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr)
11212 if (DS.isConceptSpecified())
11213 Diag(DS.getConceptSpecLoc(), diag::err_concept_wrong_decl_kind);
11215 DiagnoseFunctionSpecifiers(DS);
11217 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
11218 QualType parmDeclType = TInfo->getType();
11220 if (getLangOpts().CPlusPlus) {
11221 // Check that there are no default arguments inside the type of this
11223 CheckExtraCXXDefaultArguments(D);
11225 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1).
11226 if (D.getCXXScopeSpec().isSet()) {
11227 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator)
11228 << D.getCXXScopeSpec().getRange();
11229 D.getCXXScopeSpec().clear();
11233 // Ensure we have a valid name
11234 IdentifierInfo *II = nullptr;
11236 II = D.getIdentifier();
11238 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name)
11239 << GetNameForDeclarator(D).getName();
11240 D.setInvalidType(true);
11244 // Check for redeclaration of parameters, e.g. int foo(int x, int x);
11246 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName,
11249 if (R.isSingleResult()) {
11250 NamedDecl *PrevDecl = R.getFoundDecl();
11251 if (PrevDecl->isTemplateParameter()) {
11252 // Maybe we will complain about the shadowed template parameter.
11253 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
11254 // Just pretend that we didn't see the previous declaration.
11255 PrevDecl = nullptr;
11256 } else if (S->isDeclScope(PrevDecl)) {
11257 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II;
11258 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
11260 // Recover by removing the name
11262 D.SetIdentifier(nullptr, D.getIdentifierLoc());
11263 D.setInvalidType(true);
11268 // Temporarily put parameter variables in the translation unit, not
11269 // the enclosing context. This prevents them from accidentally
11270 // looking like class members in C++.
11271 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(),
11273 D.getIdentifierLoc(), II,
11274 parmDeclType, TInfo,
11277 if (D.isInvalidType())
11278 New->setInvalidDecl();
11280 assert(S->isFunctionPrototypeScope());
11281 assert(S->getFunctionPrototypeDepth() >= 1);
11282 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1,
11283 S->getNextFunctionPrototypeIndex());
11285 // Add the parameter declaration into this scope.
11288 IdResolver.AddDecl(New);
11290 ProcessDeclAttributes(S, New, D);
11292 if (D.getDeclSpec().isModulePrivateSpecified())
11293 Diag(New->getLocation(), diag::err_module_private_local)
11294 << 1 << New->getDeclName()
11295 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
11296 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
11298 if (New->hasAttr<BlocksAttr>()) {
11299 Diag(New->getLocation(), diag::err_block_on_nonlocal);
11304 /// \brief Synthesizes a variable for a parameter arising from a
11306 ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC,
11307 SourceLocation Loc,
11309 /* FIXME: setting StartLoc == Loc.
11310 Would it be worth to modify callers so as to provide proper source
11311 location for the unnamed parameters, embedding the parameter's type? */
11312 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, nullptr,
11313 T, Context.getTrivialTypeSourceInfo(T, Loc),
11315 Param->setImplicit();
11319 void Sema::DiagnoseUnusedParameters(ArrayRef<ParmVarDecl *> Parameters) {
11320 // Don't diagnose unused-parameter errors in template instantiations; we
11321 // will already have done so in the template itself.
11322 if (!ActiveTemplateInstantiations.empty())
11325 for (const ParmVarDecl *Parameter : Parameters) {
11326 if (!Parameter->isReferenced() && Parameter->getDeclName() &&
11327 !Parameter->hasAttr<UnusedAttr>()) {
11328 Diag(Parameter->getLocation(), diag::warn_unused_parameter)
11329 << Parameter->getDeclName();
11334 void Sema::DiagnoseSizeOfParametersAndReturnValue(
11335 ArrayRef<ParmVarDecl *> Parameters, QualType ReturnTy, NamedDecl *D) {
11336 if (LangOpts.NumLargeByValueCopy == 0) // No check.
11339 // Warn if the return value is pass-by-value and larger than the specified
11341 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) {
11342 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity();
11343 if (Size > LangOpts.NumLargeByValueCopy)
11344 Diag(D->getLocation(), diag::warn_return_value_size)
11345 << D->getDeclName() << Size;
11348 // Warn if any parameter is pass-by-value and larger than the specified
11350 for (const ParmVarDecl *Parameter : Parameters) {
11351 QualType T = Parameter->getType();
11352 if (T->isDependentType() || !T.isPODType(Context))
11354 unsigned Size = Context.getTypeSizeInChars(T).getQuantity();
11355 if (Size > LangOpts.NumLargeByValueCopy)
11356 Diag(Parameter->getLocation(), diag::warn_parameter_size)
11357 << Parameter->getDeclName() << Size;
11361 ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc,
11362 SourceLocation NameLoc, IdentifierInfo *Name,
11363 QualType T, TypeSourceInfo *TSInfo,
11365 // In ARC, infer a lifetime qualifier for appropriate parameter types.
11366 if (getLangOpts().ObjCAutoRefCount &&
11367 T.getObjCLifetime() == Qualifiers::OCL_None &&
11368 T->isObjCLifetimeType()) {
11370 Qualifiers::ObjCLifetime lifetime;
11372 // Special cases for arrays:
11373 // - if it's const, use __unsafe_unretained
11374 // - otherwise, it's an error
11375 if (T->isArrayType()) {
11376 if (!T.isConstQualified()) {
11377 DelayedDiagnostics.add(
11378 sema::DelayedDiagnostic::makeForbiddenType(
11379 NameLoc, diag::err_arc_array_param_no_ownership, T, false));
11381 lifetime = Qualifiers::OCL_ExplicitNone;
11383 lifetime = T->getObjCARCImplicitLifetime();
11385 T = Context.getLifetimeQualifiedType(T, lifetime);
11388 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name,
11389 Context.getAdjustedParameterType(T),
11390 TSInfo, SC, nullptr);
11392 // Parameters can not be abstract class types.
11393 // For record types, this is done by the AbstractClassUsageDiagnoser once
11394 // the class has been completely parsed.
11395 if (!CurContext->isRecord() &&
11396 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl,
11397 AbstractParamType))
11398 New->setInvalidDecl();
11400 // Parameter declarators cannot be interface types. All ObjC objects are
11401 // passed by reference.
11402 if (T->isObjCObjectType()) {
11403 SourceLocation TypeEndLoc =
11404 getLocForEndOfToken(TSInfo->getTypeLoc().getLocEnd());
11406 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T
11407 << FixItHint::CreateInsertion(TypeEndLoc, "*");
11408 T = Context.getObjCObjectPointerType(T);
11412 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage
11413 // duration shall not be qualified by an address-space qualifier."
11414 // Since all parameters have automatic store duration, they can not have
11415 // an address space.
11416 if (T.getAddressSpace() != 0) {
11417 // OpenCL allows function arguments declared to be an array of a type
11418 // to be qualified with an address space.
11419 if (!(getLangOpts().OpenCL && T->isArrayType())) {
11420 Diag(NameLoc, diag::err_arg_with_address_space);
11421 New->setInvalidDecl();
11428 void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D,
11429 SourceLocation LocAfterDecls) {
11430 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
11432 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared'
11433 // for a K&R function.
11434 if (!FTI.hasPrototype) {
11435 for (int i = FTI.NumParams; i != 0; /* decrement in loop */) {
11437 if (FTI.Params[i].Param == nullptr) {
11438 SmallString<256> Code;
11439 llvm::raw_svector_ostream(Code)
11440 << " int " << FTI.Params[i].Ident->getName() << ";\n";
11441 Diag(FTI.Params[i].IdentLoc, diag::ext_param_not_declared)
11442 << FTI.Params[i].Ident
11443 << FixItHint::CreateInsertion(LocAfterDecls, Code);
11445 // Implicitly declare the argument as type 'int' for lack of a better
11447 AttributeFactory attrs;
11448 DeclSpec DS(attrs);
11449 const char* PrevSpec; // unused
11450 unsigned DiagID; // unused
11451 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.Params[i].IdentLoc, PrevSpec,
11452 DiagID, Context.getPrintingPolicy());
11453 // Use the identifier location for the type source range.
11454 DS.SetRangeStart(FTI.Params[i].IdentLoc);
11455 DS.SetRangeEnd(FTI.Params[i].IdentLoc);
11456 Declarator ParamD(DS, Declarator::KNRTypeListContext);
11457 ParamD.SetIdentifier(FTI.Params[i].Ident, FTI.Params[i].IdentLoc);
11458 FTI.Params[i].Param = ActOnParamDeclarator(S, ParamD);
11465 Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D,
11466 MultiTemplateParamsArg TemplateParameterLists,
11467 SkipBodyInfo *SkipBody) {
11468 assert(getCurFunctionDecl() == nullptr && "Function parsing confused");
11469 assert(D.isFunctionDeclarator() && "Not a function declarator!");
11470 Scope *ParentScope = FnBodyScope->getParent();
11472 D.setFunctionDefinitionKind(FDK_Definition);
11473 Decl *DP = HandleDeclarator(ParentScope, D, TemplateParameterLists);
11474 return ActOnStartOfFunctionDef(FnBodyScope, DP, SkipBody);
11477 void Sema::ActOnFinishInlineFunctionDef(FunctionDecl *D) {
11478 Consumer.HandleInlineFunctionDefinition(D);
11481 static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD,
11482 const FunctionDecl*& PossibleZeroParamPrototype) {
11483 // Don't warn about invalid declarations.
11484 if (FD->isInvalidDecl())
11487 // Or declarations that aren't global.
11488 if (!FD->isGlobal())
11491 // Don't warn about C++ member functions.
11492 if (isa<CXXMethodDecl>(FD))
11495 // Don't warn about 'main'.
11499 // Don't warn about inline functions.
11500 if (FD->isInlined())
11503 // Don't warn about function templates.
11504 if (FD->getDescribedFunctionTemplate())
11507 // Don't warn about function template specializations.
11508 if (FD->isFunctionTemplateSpecialization())
11511 // Don't warn for OpenCL kernels.
11512 if (FD->hasAttr<OpenCLKernelAttr>())
11515 // Don't warn on explicitly deleted functions.
11516 if (FD->isDeleted())
11519 bool MissingPrototype = true;
11520 for (const FunctionDecl *Prev = FD->getPreviousDecl();
11521 Prev; Prev = Prev->getPreviousDecl()) {
11522 // Ignore any declarations that occur in function or method
11523 // scope, because they aren't visible from the header.
11524 if (Prev->getLexicalDeclContext()->isFunctionOrMethod())
11527 MissingPrototype = !Prev->getType()->isFunctionProtoType();
11528 if (FD->getNumParams() == 0)
11529 PossibleZeroParamPrototype = Prev;
11533 return MissingPrototype;
11537 Sema::CheckForFunctionRedefinition(FunctionDecl *FD,
11538 const FunctionDecl *EffectiveDefinition,
11539 SkipBodyInfo *SkipBody) {
11540 // Don't complain if we're in GNU89 mode and the previous definition
11541 // was an extern inline function.
11542 const FunctionDecl *Definition = EffectiveDefinition;
11544 if (!FD->isDefined(Definition))
11547 if (canRedefineFunction(Definition, getLangOpts()))
11550 // If we don't have a visible definition of the function, and it's inline or
11551 // a template, skip the new definition.
11552 if (SkipBody && !hasVisibleDefinition(Definition) &&
11553 (Definition->getFormalLinkage() == InternalLinkage ||
11554 Definition->isInlined() ||
11555 Definition->getDescribedFunctionTemplate() ||
11556 Definition->getNumTemplateParameterLists())) {
11557 SkipBody->ShouldSkip = true;
11558 if (auto *TD = Definition->getDescribedFunctionTemplate())
11559 makeMergedDefinitionVisible(TD, FD->getLocation());
11560 makeMergedDefinitionVisible(const_cast<FunctionDecl*>(Definition),
11561 FD->getLocation());
11565 if (getLangOpts().GNUMode && Definition->isInlineSpecified() &&
11566 Definition->getStorageClass() == SC_Extern)
11567 Diag(FD->getLocation(), diag::err_redefinition_extern_inline)
11568 << FD->getDeclName() << getLangOpts().CPlusPlus;
11570 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName();
11572 Diag(Definition->getLocation(), diag::note_previous_definition);
11573 FD->setInvalidDecl();
11576 static void RebuildLambdaScopeInfo(CXXMethodDecl *CallOperator,
11578 CXXRecordDecl *const LambdaClass = CallOperator->getParent();
11580 LambdaScopeInfo *LSI = S.PushLambdaScope();
11581 LSI->CallOperator = CallOperator;
11582 LSI->Lambda = LambdaClass;
11583 LSI->ReturnType = CallOperator->getReturnType();
11584 const LambdaCaptureDefault LCD = LambdaClass->getLambdaCaptureDefault();
11586 if (LCD == LCD_None)
11587 LSI->ImpCaptureStyle = CapturingScopeInfo::ImpCap_None;
11588 else if (LCD == LCD_ByCopy)
11589 LSI->ImpCaptureStyle = CapturingScopeInfo::ImpCap_LambdaByval;
11590 else if (LCD == LCD_ByRef)
11591 LSI->ImpCaptureStyle = CapturingScopeInfo::ImpCap_LambdaByref;
11592 DeclarationNameInfo DNI = CallOperator->getNameInfo();
11594 LSI->IntroducerRange = DNI.getCXXOperatorNameRange();
11595 LSI->Mutable = !CallOperator->isConst();
11597 // Add the captures to the LSI so they can be noted as already
11598 // captured within tryCaptureVar.
11599 auto I = LambdaClass->field_begin();
11600 for (const auto &C : LambdaClass->captures()) {
11601 if (C.capturesVariable()) {
11602 VarDecl *VD = C.getCapturedVar();
11603 if (VD->isInitCapture())
11604 S.CurrentInstantiationScope->InstantiatedLocal(VD, VD);
11605 QualType CaptureType = VD->getType();
11606 const bool ByRef = C.getCaptureKind() == LCK_ByRef;
11607 LSI->addCapture(VD, /*IsBlock*/false, ByRef,
11608 /*RefersToEnclosingVariableOrCapture*/true, C.getLocation(),
11609 /*EllipsisLoc*/C.isPackExpansion()
11610 ? C.getEllipsisLoc() : SourceLocation(),
11611 CaptureType, /*Expr*/ nullptr);
11613 } else if (C.capturesThis()) {
11614 LSI->addThisCapture(/*Nested*/ false, C.getLocation(),
11616 C.getCaptureKind() == LCK_StarThis);
11618 LSI->addVLATypeCapture(C.getLocation(), I->getType());
11624 Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D,
11625 SkipBodyInfo *SkipBody) {
11626 // Clear the last template instantiation error context.
11627 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation();
11631 FunctionDecl *FD = nullptr;
11633 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D))
11634 FD = FunTmpl->getTemplatedDecl();
11636 FD = cast<FunctionDecl>(D);
11638 // See if this is a redefinition.
11639 if (!FD->isLateTemplateParsed()) {
11640 CheckForFunctionRedefinition(FD, nullptr, SkipBody);
11642 // If we're skipping the body, we're done. Don't enter the scope.
11643 if (SkipBody && SkipBody->ShouldSkip)
11647 // Mark this function as "will have a body eventually". This lets users to
11648 // call e.g. isInlineDefinitionExternallyVisible while we're still parsing
11650 FD->setWillHaveBody();
11652 // If we are instantiating a generic lambda call operator, push
11653 // a LambdaScopeInfo onto the function stack. But use the information
11654 // that's already been calculated (ActOnLambdaExpr) to prime the current
11655 // LambdaScopeInfo.
11656 // When the template operator is being specialized, the LambdaScopeInfo,
11657 // has to be properly restored so that tryCaptureVariable doesn't try
11658 // and capture any new variables. In addition when calculating potential
11659 // captures during transformation of nested lambdas, it is necessary to
11660 // have the LSI properly restored.
11661 if (isGenericLambdaCallOperatorSpecialization(FD)) {
11662 assert(ActiveTemplateInstantiations.size() &&
11663 "There should be an active template instantiation on the stack "
11664 "when instantiating a generic lambda!");
11665 RebuildLambdaScopeInfo(cast<CXXMethodDecl>(D), *this);
11668 // Enter a new function scope
11669 PushFunctionScope();
11671 // Builtin functions cannot be defined.
11672 if (unsigned BuiltinID = FD->getBuiltinID()) {
11673 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID) &&
11674 !Context.BuiltinInfo.isPredefinedRuntimeFunction(BuiltinID)) {
11675 Diag(FD->getLocation(), diag::err_builtin_definition) << FD;
11676 FD->setInvalidDecl();
11680 // The return type of a function definition must be complete
11681 // (C99 6.9.1p3, C++ [dcl.fct]p6).
11682 QualType ResultType = FD->getReturnType();
11683 if (!ResultType->isDependentType() && !ResultType->isVoidType() &&
11684 !FD->isInvalidDecl() &&
11685 RequireCompleteType(FD->getLocation(), ResultType,
11686 diag::err_func_def_incomplete_result))
11687 FD->setInvalidDecl();
11690 PushDeclContext(FnBodyScope, FD);
11692 // Check the validity of our function parameters
11693 CheckParmsForFunctionDef(FD->parameters(),
11694 /*CheckParameterNames=*/true);
11696 // Add non-parameter declarations already in the function to the current
11699 for (Decl *NPD : FD->decls()) {
11700 auto *NonParmDecl = dyn_cast<NamedDecl>(NPD);
11703 assert(!isa<ParmVarDecl>(NonParmDecl) &&
11704 "parameters should not be in newly created FD yet");
11706 // If the decl has a name, make it accessible in the current scope.
11707 if (NonParmDecl->getDeclName())
11708 PushOnScopeChains(NonParmDecl, FnBodyScope, /*AddToContext=*/false);
11710 // Similarly, dive into enums and fish their constants out, making them
11711 // accessible in this scope.
11712 if (auto *ED = dyn_cast<EnumDecl>(NonParmDecl)) {
11713 for (auto *EI : ED->enumerators())
11714 PushOnScopeChains(EI, FnBodyScope, /*AddToContext=*/false);
11719 // Introduce our parameters into the function scope
11720 for (auto Param : FD->parameters()) {
11721 Param->setOwningFunction(FD);
11723 // If this has an identifier, add it to the scope stack.
11724 if (Param->getIdentifier() && FnBodyScope) {
11725 CheckShadow(FnBodyScope, Param);
11727 PushOnScopeChains(Param, FnBodyScope);
11731 // Ensure that the function's exception specification is instantiated.
11732 if (const FunctionProtoType *FPT = FD->getType()->getAs<FunctionProtoType>())
11733 ResolveExceptionSpec(D->getLocation(), FPT);
11735 // dllimport cannot be applied to non-inline function definitions.
11736 if (FD->hasAttr<DLLImportAttr>() && !FD->isInlined() &&
11737 !FD->isTemplateInstantiation()) {
11738 assert(!FD->hasAttr<DLLExportAttr>());
11739 Diag(FD->getLocation(), diag::err_attribute_dllimport_function_definition);
11740 FD->setInvalidDecl();
11743 // We want to attach documentation to original Decl (which might be
11744 // a function template).
11745 ActOnDocumentableDecl(D);
11746 if (getCurLexicalContext()->isObjCContainer() &&
11747 getCurLexicalContext()->getDeclKind() != Decl::ObjCCategoryImpl &&
11748 getCurLexicalContext()->getDeclKind() != Decl::ObjCImplementation)
11749 Diag(FD->getLocation(), diag::warn_function_def_in_objc_container);
11754 /// \brief Given the set of return statements within a function body,
11755 /// compute the variables that are subject to the named return value
11758 /// Each of the variables that is subject to the named return value
11759 /// optimization will be marked as NRVO variables in the AST, and any
11760 /// return statement that has a marked NRVO variable as its NRVO candidate can
11761 /// use the named return value optimization.
11763 /// This function applies a very simplistic algorithm for NRVO: if every return
11764 /// statement in the scope of a variable has the same NRVO candidate, that
11765 /// candidate is an NRVO variable.
11766 void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) {
11767 ReturnStmt **Returns = Scope->Returns.data();
11769 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) {
11770 if (const VarDecl *NRVOCandidate = Returns[I]->getNRVOCandidate()) {
11771 if (!NRVOCandidate->isNRVOVariable())
11772 Returns[I]->setNRVOCandidate(nullptr);
11777 bool Sema::canDelayFunctionBody(const Declarator &D) {
11778 // We can't delay parsing the body of a constexpr function template (yet).
11779 if (D.getDeclSpec().isConstexprSpecified())
11782 // We can't delay parsing the body of a function template with a deduced
11783 // return type (yet).
11784 if (D.getDeclSpec().containsPlaceholderType()) {
11785 // If the placeholder introduces a non-deduced trailing return type,
11786 // we can still delay parsing it.
11787 if (D.getNumTypeObjects()) {
11788 const auto &Outer = D.getTypeObject(D.getNumTypeObjects() - 1);
11789 if (Outer.Kind == DeclaratorChunk::Function &&
11790 Outer.Fun.hasTrailingReturnType()) {
11791 QualType Ty = GetTypeFromParser(Outer.Fun.getTrailingReturnType());
11792 return Ty.isNull() || !Ty->isUndeducedType();
11801 bool Sema::canSkipFunctionBody(Decl *D) {
11802 // We cannot skip the body of a function (or function template) which is
11803 // constexpr, since we may need to evaluate its body in order to parse the
11804 // rest of the file.
11805 // We cannot skip the body of a function with an undeduced return type,
11806 // because any callers of that function need to know the type.
11807 if (const FunctionDecl *FD = D->getAsFunction())
11808 if (FD->isConstexpr() || FD->getReturnType()->isUndeducedType())
11810 return Consumer.shouldSkipFunctionBody(D);
11813 Decl *Sema::ActOnSkippedFunctionBody(Decl *Decl) {
11814 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(Decl))
11815 FD->setHasSkippedBody();
11816 else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(Decl))
11817 MD->setHasSkippedBody();
11821 Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) {
11822 return ActOnFinishFunctionBody(D, BodyArg, false);
11825 Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body,
11826 bool IsInstantiation) {
11827 FunctionDecl *FD = dcl ? dcl->getAsFunction() : nullptr;
11829 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy();
11830 sema::AnalysisBasedWarnings::Policy *ActivePolicy = nullptr;
11832 if (getLangOpts().CoroutinesTS && !getCurFunction()->CoroutineStmts.empty())
11833 CheckCompletedCoroutineBody(FD, Body);
11838 if (getLangOpts().CPlusPlus14) {
11839 if (!FD->isInvalidDecl() && Body && !FD->isDependentContext() &&
11840 FD->getReturnType()->isUndeducedType()) {
11841 // If the function has a deduced result type but contains no 'return'
11842 // statements, the result type as written must be exactly 'auto', and
11843 // the deduced result type is 'void'.
11844 if (!FD->getReturnType()->getAs<AutoType>()) {
11845 Diag(dcl->getLocation(), diag::err_auto_fn_no_return_but_not_auto)
11846 << FD->getReturnType();
11847 FD->setInvalidDecl();
11849 // Substitute 'void' for the 'auto' in the type.
11850 TypeLoc ResultType = getReturnTypeLoc(FD);
11851 Context.adjustDeducedFunctionResultType(
11852 FD, SubstAutoType(ResultType.getType(), Context.VoidTy));
11855 } else if (getLangOpts().CPlusPlus11 && isLambdaCallOperator(FD)) {
11856 // In C++11, we don't use 'auto' deduction rules for lambda call
11857 // operators because we don't support return type deduction.
11858 auto *LSI = getCurLambda();
11859 if (LSI->HasImplicitReturnType) {
11860 deduceClosureReturnType(*LSI);
11862 // C++11 [expr.prim.lambda]p4:
11863 // [...] if there are no return statements in the compound-statement
11864 // [the deduced type is] the type void
11866 LSI->ReturnType.isNull() ? Context.VoidTy : LSI->ReturnType;
11868 // Update the return type to the deduced type.
11869 const FunctionProtoType *Proto =
11870 FD->getType()->getAs<FunctionProtoType>();
11871 FD->setType(Context.getFunctionType(RetType, Proto->getParamTypes(),
11872 Proto->getExtProtoInfo()));
11876 // The only way to be included in UndefinedButUsed is if there is an
11877 // ODR use before the definition. Avoid the expensive map lookup if this
11878 // is the first declaration.
11879 if (!FD->isFirstDecl() && FD->getPreviousDecl()->isUsed()) {
11880 if (!FD->isExternallyVisible())
11881 UndefinedButUsed.erase(FD);
11882 else if (FD->isInlined() &&
11883 !LangOpts.GNUInline &&
11884 (!FD->getPreviousDecl()->hasAttr<GNUInlineAttr>()))
11885 UndefinedButUsed.erase(FD);
11888 // If the function implicitly returns zero (like 'main') or is naked,
11889 // don't complain about missing return statements.
11890 if (FD->hasImplicitReturnZero() || FD->hasAttr<NakedAttr>())
11891 WP.disableCheckFallThrough();
11893 // MSVC permits the use of pure specifier (=0) on function definition,
11894 // defined at class scope, warn about this non-standard construct.
11895 if (getLangOpts().MicrosoftExt && FD->isPure() && FD->isCanonicalDecl())
11896 Diag(FD->getLocation(), diag::ext_pure_function_definition);
11898 if (!FD->isInvalidDecl()) {
11899 // Don't diagnose unused parameters of defaulted or deleted functions.
11900 if (!FD->isDeleted() && !FD->isDefaulted())
11901 DiagnoseUnusedParameters(FD->parameters());
11902 DiagnoseSizeOfParametersAndReturnValue(FD->parameters(),
11903 FD->getReturnType(), FD);
11905 // If this is a structor, we need a vtable.
11906 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD))
11907 MarkVTableUsed(FD->getLocation(), Constructor->getParent());
11908 else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(FD))
11909 MarkVTableUsed(FD->getLocation(), Destructor->getParent());
11911 // Try to apply the named return value optimization. We have to check
11912 // if we can do this here because lambdas keep return statements around
11913 // to deduce an implicit return type.
11914 if (getLangOpts().CPlusPlus && FD->getReturnType()->isRecordType() &&
11915 !FD->isDependentContext())
11916 computeNRVO(Body, getCurFunction());
11919 // GNU warning -Wmissing-prototypes:
11920 // Warn if a global function is defined without a previous
11921 // prototype declaration. This warning is issued even if the
11922 // definition itself provides a prototype. The aim is to detect
11923 // global functions that fail to be declared in header files.
11924 const FunctionDecl *PossibleZeroParamPrototype = nullptr;
11925 if (ShouldWarnAboutMissingPrototype(FD, PossibleZeroParamPrototype)) {
11926 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD;
11928 if (PossibleZeroParamPrototype) {
11929 // We found a declaration that is not a prototype,
11930 // but that could be a zero-parameter prototype
11931 if (TypeSourceInfo *TI =
11932 PossibleZeroParamPrototype->getTypeSourceInfo()) {
11933 TypeLoc TL = TI->getTypeLoc();
11934 if (FunctionNoProtoTypeLoc FTL = TL.getAs<FunctionNoProtoTypeLoc>())
11935 Diag(PossibleZeroParamPrototype->getLocation(),
11936 diag::note_declaration_not_a_prototype)
11937 << PossibleZeroParamPrototype
11938 << FixItHint::CreateInsertion(FTL.getRParenLoc(), "void");
11942 // GNU warning -Wstrict-prototypes
11943 // Warn if K&R function is defined without a previous declaration.
11944 // This warning is issued only if the definition itself does not provide
11945 // a prototype. Only K&R definitions do not provide a prototype.
11946 // An empty list in a function declarator that is part of a definition
11947 // of that function specifies that the function has no parameters
11948 // (C99 6.7.5.3p14)
11949 if (!FD->hasWrittenPrototype() && FD->getNumParams() > 0 &&
11950 !LangOpts.CPlusPlus) {
11951 TypeSourceInfo *TI = FD->getTypeSourceInfo();
11952 TypeLoc TL = TI->getTypeLoc();
11953 FunctionTypeLoc FTL = TL.castAs<FunctionTypeLoc>();
11954 Diag(FTL.getLParenLoc(), diag::warn_strict_prototypes) << 1;
11958 if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) {
11959 const CXXMethodDecl *KeyFunction;
11960 if (MD->isOutOfLine() && (MD = MD->getCanonicalDecl()) &&
11962 (KeyFunction = Context.getCurrentKeyFunction(MD->getParent())) &&
11963 MD == KeyFunction->getCanonicalDecl()) {
11964 // Update the key-function state if necessary for this ABI.
11965 if (FD->isInlined() &&
11966 !Context.getTargetInfo().getCXXABI().canKeyFunctionBeInline()) {
11967 Context.setNonKeyFunction(MD);
11969 // If the newly-chosen key function is already defined, then we
11970 // need to mark the vtable as used retroactively.
11971 KeyFunction = Context.getCurrentKeyFunction(MD->getParent());
11972 const FunctionDecl *Definition;
11973 if (KeyFunction && KeyFunction->isDefined(Definition))
11974 MarkVTableUsed(Definition->getLocation(), MD->getParent(), true);
11976 // We just defined they key function; mark the vtable as used.
11977 MarkVTableUsed(FD->getLocation(), MD->getParent(), true);
11982 assert((FD == getCurFunctionDecl() || getCurLambda()->CallOperator == FD) &&
11983 "Function parsing confused");
11984 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) {
11985 assert(MD == getCurMethodDecl() && "Method parsing confused");
11987 if (!MD->isInvalidDecl()) {
11988 DiagnoseUnusedParameters(MD->parameters());
11989 DiagnoseSizeOfParametersAndReturnValue(MD->parameters(),
11990 MD->getReturnType(), MD);
11993 computeNRVO(Body, getCurFunction());
11995 if (getCurFunction()->ObjCShouldCallSuper) {
11996 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_call)
11997 << MD->getSelector().getAsString();
11998 getCurFunction()->ObjCShouldCallSuper = false;
12000 if (getCurFunction()->ObjCWarnForNoDesignatedInitChain) {
12001 const ObjCMethodDecl *InitMethod = nullptr;
12002 bool isDesignated =
12003 MD->isDesignatedInitializerForTheInterface(&InitMethod);
12004 assert(isDesignated && InitMethod);
12005 (void)isDesignated;
12007 auto superIsNSObject = [&](const ObjCMethodDecl *MD) {
12008 auto IFace = MD->getClassInterface();
12011 auto SuperD = IFace->getSuperClass();
12014 return SuperD->getIdentifier() ==
12015 NSAPIObj->getNSClassId(NSAPI::ClassId_NSObject);
12017 // Don't issue this warning for unavailable inits or direct subclasses
12019 if (!MD->isUnavailable() && !superIsNSObject(MD)) {
12020 Diag(MD->getLocation(),
12021 diag::warn_objc_designated_init_missing_super_call);
12022 Diag(InitMethod->getLocation(),
12023 diag::note_objc_designated_init_marked_here);
12025 getCurFunction()->ObjCWarnForNoDesignatedInitChain = false;
12027 if (getCurFunction()->ObjCWarnForNoInitDelegation) {
12028 // Don't issue this warning for unavaialable inits.
12029 if (!MD->isUnavailable())
12030 Diag(MD->getLocation(),
12031 diag::warn_objc_secondary_init_missing_init_call);
12032 getCurFunction()->ObjCWarnForNoInitDelegation = false;
12038 if (Body && getCurFunction()->HasPotentialAvailabilityViolations)
12039 DiagnoseUnguardedAvailabilityViolations(dcl);
12041 assert(!getCurFunction()->ObjCShouldCallSuper &&
12042 "This should only be set for ObjC methods, which should have been "
12043 "handled in the block above.");
12045 // Verify and clean out per-function state.
12046 if (Body && (!FD || !FD->isDefaulted())) {
12047 // C++ constructors that have function-try-blocks can't have return
12048 // statements in the handlers of that block. (C++ [except.handle]p14)
12050 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body))
12051 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body));
12053 // Verify that gotos and switch cases don't jump into scopes illegally.
12054 if (getCurFunction()->NeedsScopeChecking() &&
12055 !PP.isCodeCompletionEnabled())
12056 DiagnoseInvalidJumps(Body);
12058 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) {
12059 if (!Destructor->getParent()->isDependentType())
12060 CheckDestructor(Destructor);
12062 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(),
12063 Destructor->getParent());
12066 // If any errors have occurred, clear out any temporaries that may have
12067 // been leftover. This ensures that these temporaries won't be picked up for
12068 // deletion in some later function.
12069 if (getDiagnostics().hasErrorOccurred() ||
12070 getDiagnostics().getSuppressAllDiagnostics()) {
12071 DiscardCleanupsInEvaluationContext();
12073 if (!getDiagnostics().hasUncompilableErrorOccurred() &&
12074 !isa<FunctionTemplateDecl>(dcl)) {
12075 // Since the body is valid, issue any analysis-based warnings that are
12077 ActivePolicy = &WP;
12080 if (!IsInstantiation && FD && FD->isConstexpr() && !FD->isInvalidDecl() &&
12081 (!CheckConstexprFunctionDecl(FD) ||
12082 !CheckConstexprFunctionBody(FD, Body)))
12083 FD->setInvalidDecl();
12085 if (FD && FD->hasAttr<NakedAttr>()) {
12086 for (const Stmt *S : Body->children()) {
12087 // Allow local register variables without initializer as they don't
12088 // require prologue.
12089 bool RegisterVariables = false;
12090 if (auto *DS = dyn_cast<DeclStmt>(S)) {
12091 for (const auto *Decl : DS->decls()) {
12092 if (const auto *Var = dyn_cast<VarDecl>(Decl)) {
12093 RegisterVariables =
12094 Var->hasAttr<AsmLabelAttr>() && !Var->hasInit();
12095 if (!RegisterVariables)
12100 if (RegisterVariables)
12102 if (!isa<AsmStmt>(S) && !isa<NullStmt>(S)) {
12103 Diag(S->getLocStart(), diag::err_non_asm_stmt_in_naked_function);
12104 Diag(FD->getAttr<NakedAttr>()->getLocation(), diag::note_attribute);
12105 FD->setInvalidDecl();
12111 assert(ExprCleanupObjects.size() ==
12112 ExprEvalContexts.back().NumCleanupObjects &&
12113 "Leftover temporaries in function");
12114 assert(!Cleanup.exprNeedsCleanups() && "Unaccounted cleanups in function");
12115 assert(MaybeODRUseExprs.empty() &&
12116 "Leftover expressions for odr-use checking");
12119 if (!IsInstantiation)
12122 PopFunctionScopeInfo(ActivePolicy, dcl);
12123 // If any errors have occurred, clear out any temporaries that may have
12124 // been leftover. This ensures that these temporaries won't be picked up for
12125 // deletion in some later function.
12126 if (getDiagnostics().hasErrorOccurred()) {
12127 DiscardCleanupsInEvaluationContext();
12133 /// When we finish delayed parsing of an attribute, we must attach it to the
12135 void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D,
12136 ParsedAttributes &Attrs) {
12137 // Always attach attributes to the underlying decl.
12138 if (TemplateDecl *TD = dyn_cast<TemplateDecl>(D))
12139 D = TD->getTemplatedDecl();
12140 ProcessDeclAttributeList(S, D, Attrs.getList());
12142 if (CXXMethodDecl *Method = dyn_cast_or_null<CXXMethodDecl>(D))
12143 if (Method->isStatic())
12144 checkThisInStaticMemberFunctionAttributes(Method);
12147 /// ImplicitlyDefineFunction - An undeclared identifier was used in a function
12148 /// call, forming a call to an implicitly defined function (per C99 6.5.1p2).
12149 NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc,
12150 IdentifierInfo &II, Scope *S) {
12151 // Before we produce a declaration for an implicitly defined
12152 // function, see whether there was a locally-scoped declaration of
12153 // this name as a function or variable. If so, use that
12154 // (non-visible) declaration, and complain about it.
12155 if (NamedDecl *ExternCPrev = findLocallyScopedExternCDecl(&II)) {
12156 Diag(Loc, diag::warn_use_out_of_scope_declaration) << ExternCPrev;
12157 Diag(ExternCPrev->getLocation(), diag::note_previous_declaration);
12158 return ExternCPrev;
12161 // Extension in C99. Legal in C90, but warn about it.
12163 if (II.getName().startswith("__builtin_"))
12164 diag_id = diag::warn_builtin_unknown;
12165 else if (getLangOpts().C99)
12166 diag_id = diag::ext_implicit_function_decl;
12168 diag_id = diag::warn_implicit_function_decl;
12169 Diag(Loc, diag_id) << &II;
12171 // Because typo correction is expensive, only do it if the implicit
12172 // function declaration is going to be treated as an error.
12173 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) {
12174 TypoCorrection Corrected;
12176 (Corrected = CorrectTypo(
12177 DeclarationNameInfo(&II, Loc), LookupOrdinaryName, S, nullptr,
12178 llvm::make_unique<DeclFilterCCC<FunctionDecl>>(), CTK_NonError)))
12179 diagnoseTypo(Corrected, PDiag(diag::note_function_suggestion),
12180 /*ErrorRecovery*/false);
12183 // Set a Declarator for the implicit definition: int foo();
12185 AttributeFactory attrFactory;
12186 DeclSpec DS(attrFactory);
12188 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID,
12189 Context.getPrintingPolicy());
12190 (void)Error; // Silence warning.
12191 assert(!Error && "Error setting up implicit decl!");
12192 SourceLocation NoLoc;
12193 Declarator D(DS, Declarator::BlockContext);
12194 D.AddTypeInfo(DeclaratorChunk::getFunction(/*HasProto=*/false,
12195 /*IsAmbiguous=*/false,
12196 /*LParenLoc=*/NoLoc,
12197 /*Params=*/nullptr,
12199 /*EllipsisLoc=*/NoLoc,
12200 /*RParenLoc=*/NoLoc,
12202 /*RefQualifierIsLvalueRef=*/true,
12203 /*RefQualifierLoc=*/NoLoc,
12204 /*ConstQualifierLoc=*/NoLoc,
12205 /*VolatileQualifierLoc=*/NoLoc,
12206 /*RestrictQualifierLoc=*/NoLoc,
12207 /*MutableLoc=*/NoLoc,
12209 /*ESpecRange=*/SourceRange(),
12210 /*Exceptions=*/nullptr,
12211 /*ExceptionRanges=*/nullptr,
12212 /*NumExceptions=*/0,
12213 /*NoexceptExpr=*/nullptr,
12214 /*ExceptionSpecTokens=*/nullptr,
12215 /*DeclsInPrototype=*/None,
12217 DS.getAttributes(),
12219 D.SetIdentifier(&II, Loc);
12221 // Insert this function into translation-unit scope.
12223 DeclContext *PrevDC = CurContext;
12224 CurContext = Context.getTranslationUnitDecl();
12226 FunctionDecl *FD = cast<FunctionDecl>(ActOnDeclarator(TUScope, D));
12229 CurContext = PrevDC;
12231 AddKnownFunctionAttributes(FD);
12236 /// \brief Adds any function attributes that we know a priori based on
12237 /// the declaration of this function.
12239 /// These attributes can apply both to implicitly-declared builtins
12240 /// (like __builtin___printf_chk) or to library-declared functions
12241 /// like NSLog or printf.
12243 /// We need to check for duplicate attributes both here and where user-written
12244 /// attributes are applied to declarations.
12245 void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) {
12246 if (FD->isInvalidDecl())
12249 // If this is a built-in function, map its builtin attributes to
12250 // actual attributes.
12251 if (unsigned BuiltinID = FD->getBuiltinID()) {
12252 // Handle printf-formatting attributes.
12253 unsigned FormatIdx;
12255 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) {
12256 if (!FD->hasAttr<FormatAttr>()) {
12257 const char *fmt = "printf";
12258 unsigned int NumParams = FD->getNumParams();
12259 if (FormatIdx < NumParams && // NumParams may be 0 (e.g. vfprintf)
12260 FD->getParamDecl(FormatIdx)->getType()->isObjCObjectPointerType())
12262 FD->addAttr(FormatAttr::CreateImplicit(Context,
12263 &Context.Idents.get(fmt),
12265 HasVAListArg ? 0 : FormatIdx+2,
12266 FD->getLocation()));
12269 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx,
12271 if (!FD->hasAttr<FormatAttr>())
12272 FD->addAttr(FormatAttr::CreateImplicit(Context,
12273 &Context.Idents.get("scanf"),
12275 HasVAListArg ? 0 : FormatIdx+2,
12276 FD->getLocation()));
12279 // Mark const if we don't care about errno and that is the only
12280 // thing preventing the function from being const. This allows
12281 // IRgen to use LLVM intrinsics for such functions.
12282 if (!getLangOpts().MathErrno &&
12283 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) {
12284 if (!FD->hasAttr<ConstAttr>())
12285 FD->addAttr(ConstAttr::CreateImplicit(Context, FD->getLocation()));
12288 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) &&
12289 !FD->hasAttr<ReturnsTwiceAttr>())
12290 FD->addAttr(ReturnsTwiceAttr::CreateImplicit(Context,
12291 FD->getLocation()));
12292 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->hasAttr<NoThrowAttr>())
12293 FD->addAttr(NoThrowAttr::CreateImplicit(Context, FD->getLocation()));
12294 if (Context.BuiltinInfo.isPure(BuiltinID) && !FD->hasAttr<PureAttr>())
12295 FD->addAttr(PureAttr::CreateImplicit(Context, FD->getLocation()));
12296 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->hasAttr<ConstAttr>())
12297 FD->addAttr(ConstAttr::CreateImplicit(Context, FD->getLocation()));
12298 if (getLangOpts().CUDA && Context.BuiltinInfo.isTSBuiltin(BuiltinID) &&
12299 !FD->hasAttr<CUDADeviceAttr>() && !FD->hasAttr<CUDAHostAttr>()) {
12300 // Add the appropriate attribute, depending on the CUDA compilation mode
12301 // and which target the builtin belongs to. For example, during host
12302 // compilation, aux builtins are __device__, while the rest are __host__.
12303 if (getLangOpts().CUDAIsDevice !=
12304 Context.BuiltinInfo.isAuxBuiltinID(BuiltinID))
12305 FD->addAttr(CUDADeviceAttr::CreateImplicit(Context, FD->getLocation()));
12307 FD->addAttr(CUDAHostAttr::CreateImplicit(Context, FD->getLocation()));
12311 // If C++ exceptions are enabled but we are told extern "C" functions cannot
12312 // throw, add an implicit nothrow attribute to any extern "C" function we come
12314 if (getLangOpts().CXXExceptions && getLangOpts().ExternCNoUnwind &&
12315 FD->isExternC() && !FD->hasAttr<NoThrowAttr>()) {
12316 const auto *FPT = FD->getType()->getAs<FunctionProtoType>();
12317 if (!FPT || FPT->getExceptionSpecType() == EST_None)
12318 FD->addAttr(NoThrowAttr::CreateImplicit(Context, FD->getLocation()));
12321 IdentifierInfo *Name = FD->getIdentifier();
12324 if ((!getLangOpts().CPlusPlus &&
12325 FD->getDeclContext()->isTranslationUnit()) ||
12326 (isa<LinkageSpecDecl>(FD->getDeclContext()) &&
12327 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() ==
12328 LinkageSpecDecl::lang_c)) {
12329 // Okay: this could be a libc/libm/Objective-C function we know
12334 if (Name->isStr("asprintf") || Name->isStr("vasprintf")) {
12335 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be
12336 // target-specific builtins, perhaps?
12337 if (!FD->hasAttr<FormatAttr>())
12338 FD->addAttr(FormatAttr::CreateImplicit(Context,
12339 &Context.Idents.get("printf"), 2,
12340 Name->isStr("vasprintf") ? 0 : 3,
12341 FD->getLocation()));
12344 if (Name->isStr("__CFStringMakeConstantString")) {
12345 // We already have a __builtin___CFStringMakeConstantString,
12346 // but builds that use -fno-constant-cfstrings don't go through that.
12347 if (!FD->hasAttr<FormatArgAttr>())
12348 FD->addAttr(FormatArgAttr::CreateImplicit(Context, 1,
12349 FD->getLocation()));
12353 TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
12354 TypeSourceInfo *TInfo) {
12355 assert(D.getIdentifier() && "Wrong callback for declspec without declarator");
12356 assert(!T.isNull() && "GetTypeForDeclarator() returned null type");
12359 assert(D.isInvalidType() && "no declarator info for valid type");
12360 TInfo = Context.getTrivialTypeSourceInfo(T);
12363 // Scope manipulation handled by caller.
12364 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext,
12366 D.getIdentifierLoc(),
12370 // Bail out immediately if we have an invalid declaration.
12371 if (D.isInvalidType()) {
12372 NewTD->setInvalidDecl();
12376 if (D.getDeclSpec().isModulePrivateSpecified()) {
12377 if (CurContext->isFunctionOrMethod())
12378 Diag(NewTD->getLocation(), diag::err_module_private_local)
12379 << 2 << NewTD->getDeclName()
12380 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
12381 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
12383 NewTD->setModulePrivate();
12386 // C++ [dcl.typedef]p8:
12387 // If the typedef declaration defines an unnamed class (or
12388 // enum), the first typedef-name declared by the declaration
12389 // to be that class type (or enum type) is used to denote the
12390 // class type (or enum type) for linkage purposes only.
12391 // We need to check whether the type was declared in the declaration.
12392 switch (D.getDeclSpec().getTypeSpecType()) {
12395 case TST_interface:
12398 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
12399 setTagNameForLinkagePurposes(tagFromDeclSpec, NewTD);
12410 /// \brief Check that this is a valid underlying type for an enum declaration.
12411 bool Sema::CheckEnumUnderlyingType(TypeSourceInfo *TI) {
12412 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc();
12413 QualType T = TI->getType();
12415 if (T->isDependentType())
12418 if (const BuiltinType *BT = T->getAs<BuiltinType>())
12419 if (BT->isInteger())
12422 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) << T;
12426 /// Check whether this is a valid redeclaration of a previous enumeration.
12427 /// \return true if the redeclaration was invalid.
12428 bool Sema::CheckEnumRedeclaration(
12429 SourceLocation EnumLoc, bool IsScoped, QualType EnumUnderlyingTy,
12430 bool EnumUnderlyingIsImplicit, const EnumDecl *Prev) {
12431 bool IsFixed = !EnumUnderlyingTy.isNull();
12433 if (IsScoped != Prev->isScoped()) {
12434 Diag(EnumLoc, diag::err_enum_redeclare_scoped_mismatch)
12435 << Prev->isScoped();
12436 Diag(Prev->getLocation(), diag::note_previous_declaration);
12440 if (IsFixed && Prev->isFixed()) {
12441 if (!EnumUnderlyingTy->isDependentType() &&
12442 !Prev->getIntegerType()->isDependentType() &&
12443 !Context.hasSameUnqualifiedType(EnumUnderlyingTy,
12444 Prev->getIntegerType())) {
12445 // TODO: Highlight the underlying type of the redeclaration.
12446 Diag(EnumLoc, diag::err_enum_redeclare_type_mismatch)
12447 << EnumUnderlyingTy << Prev->getIntegerType();
12448 Diag(Prev->getLocation(), diag::note_previous_declaration)
12449 << Prev->getIntegerTypeRange();
12452 } else if (IsFixed && !Prev->isFixed() && EnumUnderlyingIsImplicit) {
12454 } else if (!IsFixed && Prev->isFixed() && !Prev->getIntegerTypeSourceInfo()) {
12456 } else if (IsFixed != Prev->isFixed()) {
12457 Diag(EnumLoc, diag::err_enum_redeclare_fixed_mismatch)
12458 << Prev->isFixed();
12459 Diag(Prev->getLocation(), diag::note_previous_declaration);
12466 /// \brief Get diagnostic %select index for tag kind for
12467 /// redeclaration diagnostic message.
12468 /// WARNING: Indexes apply to particular diagnostics only!
12470 /// \returns diagnostic %select index.
12471 static unsigned getRedeclDiagFromTagKind(TagTypeKind Tag) {
12473 case TTK_Struct: return 0;
12474 case TTK_Interface: return 1;
12475 case TTK_Class: return 2;
12476 default: llvm_unreachable("Invalid tag kind for redecl diagnostic!");
12480 /// \brief Determine if tag kind is a class-key compatible with
12481 /// class for redeclaration (class, struct, or __interface).
12483 /// \returns true iff the tag kind is compatible.
12484 static bool isClassCompatTagKind(TagTypeKind Tag)
12486 return Tag == TTK_Struct || Tag == TTK_Class || Tag == TTK_Interface;
12489 Sema::NonTagKind Sema::getNonTagTypeDeclKind(const Decl *PrevDecl,
12491 if (isa<TypedefDecl>(PrevDecl))
12492 return NTK_Typedef;
12493 else if (isa<TypeAliasDecl>(PrevDecl))
12494 return NTK_TypeAlias;
12495 else if (isa<ClassTemplateDecl>(PrevDecl))
12496 return NTK_Template;
12497 else if (isa<TypeAliasTemplateDecl>(PrevDecl))
12498 return NTK_TypeAliasTemplate;
12499 else if (isa<TemplateTemplateParmDecl>(PrevDecl))
12500 return NTK_TemplateTemplateArgument;
12503 case TTK_Interface:
12505 return getLangOpts().CPlusPlus ? NTK_NonClass : NTK_NonStruct;
12507 return NTK_NonUnion;
12509 return NTK_NonEnum;
12511 llvm_unreachable("invalid TTK");
12514 /// \brief Determine whether a tag with a given kind is acceptable
12515 /// as a redeclaration of the given tag declaration.
12517 /// \returns true if the new tag kind is acceptable, false otherwise.
12518 bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous,
12519 TagTypeKind NewTag, bool isDefinition,
12520 SourceLocation NewTagLoc,
12521 const IdentifierInfo *Name) {
12522 // C++ [dcl.type.elab]p3:
12523 // The class-key or enum keyword present in the
12524 // elaborated-type-specifier shall agree in kind with the
12525 // declaration to which the name in the elaborated-type-specifier
12526 // refers. This rule also applies to the form of
12527 // elaborated-type-specifier that declares a class-name or
12528 // friend class since it can be construed as referring to the
12529 // definition of the class. Thus, in any
12530 // elaborated-type-specifier, the enum keyword shall be used to
12531 // refer to an enumeration (7.2), the union class-key shall be
12532 // used to refer to a union (clause 9), and either the class or
12533 // struct class-key shall be used to refer to a class (clause 9)
12534 // declared using the class or struct class-key.
12535 TagTypeKind OldTag = Previous->getTagKind();
12536 if (!isDefinition || !isClassCompatTagKind(NewTag))
12537 if (OldTag == NewTag)
12540 if (isClassCompatTagKind(OldTag) && isClassCompatTagKind(NewTag)) {
12541 // Warn about the struct/class tag mismatch.
12542 bool isTemplate = false;
12543 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous))
12544 isTemplate = Record->getDescribedClassTemplate();
12546 if (!ActiveTemplateInstantiations.empty()) {
12547 // In a template instantiation, do not offer fix-its for tag mismatches
12548 // since they usually mess up the template instead of fixing the problem.
12549 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch)
12550 << getRedeclDiagFromTagKind(NewTag) << isTemplate << Name
12551 << getRedeclDiagFromTagKind(OldTag);
12555 if (isDefinition) {
12556 // On definitions, check previous tags and issue a fix-it for each
12557 // one that doesn't match the current tag.
12558 if (Previous->getDefinition()) {
12559 // Don't suggest fix-its for redefinitions.
12563 bool previousMismatch = false;
12564 for (auto I : Previous->redecls()) {
12565 if (I->getTagKind() != NewTag) {
12566 if (!previousMismatch) {
12567 previousMismatch = true;
12568 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch)
12569 << getRedeclDiagFromTagKind(NewTag) << isTemplate << Name
12570 << getRedeclDiagFromTagKind(I->getTagKind());
12572 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion)
12573 << getRedeclDiagFromTagKind(NewTag)
12574 << FixItHint::CreateReplacement(I->getInnerLocStart(),
12575 TypeWithKeyword::getTagTypeKindName(NewTag));
12581 // Check for a previous definition. If current tag and definition
12582 // are same type, do nothing. If no definition, but disagree with
12583 // with previous tag type, give a warning, but no fix-it.
12584 const TagDecl *Redecl = Previous->getDefinition() ?
12585 Previous->getDefinition() : Previous;
12586 if (Redecl->getTagKind() == NewTag) {
12590 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch)
12591 << getRedeclDiagFromTagKind(NewTag) << isTemplate << Name
12592 << getRedeclDiagFromTagKind(OldTag);
12593 Diag(Redecl->getLocation(), diag::note_previous_use);
12595 // If there is a previous definition, suggest a fix-it.
12596 if (Previous->getDefinition()) {
12597 Diag(NewTagLoc, diag::note_struct_class_suggestion)
12598 << getRedeclDiagFromTagKind(Redecl->getTagKind())
12599 << FixItHint::CreateReplacement(SourceRange(NewTagLoc),
12600 TypeWithKeyword::getTagTypeKindName(Redecl->getTagKind()));
12608 /// Add a minimal nested name specifier fixit hint to allow lookup of a tag name
12609 /// from an outer enclosing namespace or file scope inside a friend declaration.
12610 /// This should provide the commented out code in the following snippet:
12614 /// struct Y { friend struct /*N::*/ X; };
12617 static FixItHint createFriendTagNNSFixIt(Sema &SemaRef, NamedDecl *ND, Scope *S,
12618 SourceLocation NameLoc) {
12619 // While the decl is in a namespace, do repeated lookup of that name and see
12620 // if we get the same namespace back. If we do not, continue until
12621 // translation unit scope, at which point we have a fully qualified NNS.
12622 SmallVector<IdentifierInfo *, 4> Namespaces;
12623 DeclContext *DC = ND->getDeclContext()->getRedeclContext();
12624 for (; !DC->isTranslationUnit(); DC = DC->getParent()) {
12625 // This tag should be declared in a namespace, which can only be enclosed by
12626 // other namespaces. Bail if there's an anonymous namespace in the chain.
12627 NamespaceDecl *Namespace = dyn_cast<NamespaceDecl>(DC);
12628 if (!Namespace || Namespace->isAnonymousNamespace())
12629 return FixItHint();
12630 IdentifierInfo *II = Namespace->getIdentifier();
12631 Namespaces.push_back(II);
12632 NamedDecl *Lookup = SemaRef.LookupSingleName(
12633 S, II, NameLoc, Sema::LookupNestedNameSpecifierName);
12634 if (Lookup == Namespace)
12638 // Once we have all the namespaces, reverse them to go outermost first, and
12640 SmallString<64> Insertion;
12641 llvm::raw_svector_ostream OS(Insertion);
12642 if (DC->isTranslationUnit())
12644 std::reverse(Namespaces.begin(), Namespaces.end());
12645 for (auto *II : Namespaces)
12646 OS << II->getName() << "::";
12647 return FixItHint::CreateInsertion(NameLoc, Insertion);
12650 /// \brief Determine whether a tag originally declared in context \p OldDC can
12651 /// be redeclared with an unqualfied name in \p NewDC (assuming name lookup
12652 /// found a declaration in \p OldDC as a previous decl, perhaps through a
12653 /// using-declaration).
12654 static bool isAcceptableTagRedeclContext(Sema &S, DeclContext *OldDC,
12655 DeclContext *NewDC) {
12656 OldDC = OldDC->getRedeclContext();
12657 NewDC = NewDC->getRedeclContext();
12659 if (OldDC->Equals(NewDC))
12662 // In MSVC mode, we allow a redeclaration if the contexts are related (either
12663 // encloses the other).
12664 if (S.getLangOpts().MSVCCompat &&
12665 (OldDC->Encloses(NewDC) || NewDC->Encloses(OldDC)))
12671 /// \brief This is invoked when we see 'struct foo' or 'struct {'. In the
12672 /// former case, Name will be non-null. In the later case, Name will be null.
12673 /// TagSpec indicates what kind of tag this is. TUK indicates whether this is a
12674 /// reference/declaration/definition of a tag.
12676 /// \param IsTypeSpecifier \c true if this is a type-specifier (or
12677 /// trailing-type-specifier) other than one in an alias-declaration.
12679 /// \param SkipBody If non-null, will be set to indicate if the caller should
12680 /// skip the definition of this tag and treat it as if it were a declaration.
12681 Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
12682 SourceLocation KWLoc, CXXScopeSpec &SS,
12683 IdentifierInfo *Name, SourceLocation NameLoc,
12684 AttributeList *Attr, AccessSpecifier AS,
12685 SourceLocation ModulePrivateLoc,
12686 MultiTemplateParamsArg TemplateParameterLists,
12687 bool &OwnedDecl, bool &IsDependent,
12688 SourceLocation ScopedEnumKWLoc,
12689 bool ScopedEnumUsesClassTag,
12690 TypeResult UnderlyingType,
12691 bool IsTypeSpecifier, SkipBodyInfo *SkipBody) {
12692 // If this is not a definition, it must have a name.
12693 IdentifierInfo *OrigName = Name;
12694 assert((Name != nullptr || TUK == TUK_Definition) &&
12695 "Nameless record must be a definition!");
12696 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference);
12699 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
12700 bool ScopedEnum = ScopedEnumKWLoc.isValid();
12702 // FIXME: Check explicit specializations more carefully.
12703 bool isExplicitSpecialization = false;
12704 bool Invalid = false;
12706 // We only need to do this matching if we have template parameters
12707 // or a scope specifier, which also conveniently avoids this work
12708 // for non-C++ cases.
12709 if (TemplateParameterLists.size() > 0 ||
12710 (SS.isNotEmpty() && TUK != TUK_Reference)) {
12711 if (TemplateParameterList *TemplateParams =
12712 MatchTemplateParametersToScopeSpecifier(
12713 KWLoc, NameLoc, SS, nullptr, TemplateParameterLists,
12714 TUK == TUK_Friend, isExplicitSpecialization, Invalid)) {
12715 if (Kind == TTK_Enum) {
12716 Diag(KWLoc, diag::err_enum_template);
12720 if (TemplateParams->size() > 0) {
12721 // This is a declaration or definition of a class template (which may
12722 // be a member of another template).
12728 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc,
12729 SS, Name, NameLoc, Attr,
12730 TemplateParams, AS,
12732 /*FriendLoc*/SourceLocation(),
12733 TemplateParameterLists.size()-1,
12734 TemplateParameterLists.data(),
12736 return Result.get();
12738 // The "template<>" header is extraneous.
12739 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams)
12740 << TypeWithKeyword::getTagTypeKindName(Kind) << Name;
12741 isExplicitSpecialization = true;
12746 // Figure out the underlying type if this a enum declaration. We need to do
12747 // this early, because it's needed to detect if this is an incompatible
12749 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying;
12750 bool EnumUnderlyingIsImplicit = false;
12752 if (Kind == TTK_Enum) {
12753 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum))
12754 // No underlying type explicitly specified, or we failed to parse the
12755 // type, default to int.
12756 EnumUnderlying = Context.IntTy.getTypePtr();
12757 else if (UnderlyingType.get()) {
12758 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an
12759 // integral type; any cv-qualification is ignored.
12760 TypeSourceInfo *TI = nullptr;
12761 GetTypeFromParser(UnderlyingType.get(), &TI);
12762 EnumUnderlying = TI;
12764 if (CheckEnumUnderlyingType(TI))
12765 // Recover by falling back to int.
12766 EnumUnderlying = Context.IntTy.getTypePtr();
12768 if (DiagnoseUnexpandedParameterPack(TI->getTypeLoc().getBeginLoc(), TI,
12769 UPPC_FixedUnderlyingType))
12770 EnumUnderlying = Context.IntTy.getTypePtr();
12772 } else if (Context.getTargetInfo().getCXXABI().isMicrosoft()) {
12773 if (getLangOpts().MSVCCompat || TUK == TUK_Definition) {
12774 // Microsoft enums are always of int type.
12775 EnumUnderlying = Context.IntTy.getTypePtr();
12776 EnumUnderlyingIsImplicit = true;
12781 DeclContext *SearchDC = CurContext;
12782 DeclContext *DC = CurContext;
12783 bool isStdBadAlloc = false;
12784 bool isStdAlignValT = false;
12786 RedeclarationKind Redecl = ForRedeclaration;
12787 if (TUK == TUK_Friend || TUK == TUK_Reference)
12788 Redecl = NotForRedeclaration;
12790 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl);
12791 if (Name && SS.isNotEmpty()) {
12792 // We have a nested-name tag ('struct foo::bar').
12794 // Check for invalid 'foo::'.
12795 if (SS.isInvalid()) {
12797 goto CreateNewDecl;
12800 // If this is a friend or a reference to a class in a dependent
12801 // context, don't try to make a decl for it.
12802 if (TUK == TUK_Friend || TUK == TUK_Reference) {
12803 DC = computeDeclContext(SS, false);
12805 IsDependent = true;
12809 DC = computeDeclContext(SS, true);
12811 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec)
12817 if (RequireCompleteDeclContext(SS, DC))
12821 // Look-up name inside 'foo::'.
12822 LookupQualifiedName(Previous, DC);
12824 if (Previous.isAmbiguous())
12827 if (Previous.empty()) {
12828 // Name lookup did not find anything. However, if the
12829 // nested-name-specifier refers to the current instantiation,
12830 // and that current instantiation has any dependent base
12831 // classes, we might find something at instantiation time: treat
12832 // this as a dependent elaborated-type-specifier.
12833 // But this only makes any sense for reference-like lookups.
12834 if (Previous.wasNotFoundInCurrentInstantiation() &&
12835 (TUK == TUK_Reference || TUK == TUK_Friend)) {
12836 IsDependent = true;
12840 // A tag 'foo::bar' must already exist.
12841 Diag(NameLoc, diag::err_not_tag_in_scope)
12842 << Kind << Name << DC << SS.getRange();
12845 goto CreateNewDecl;
12848 // C++14 [class.mem]p14:
12849 // If T is the name of a class, then each of the following shall have a
12850 // name different from T:
12851 // -- every member of class T that is itself a type
12852 if (TUK != TUK_Reference && TUK != TUK_Friend &&
12853 DiagnoseClassNameShadow(SearchDC, DeclarationNameInfo(Name, NameLoc)))
12856 // If this is a named struct, check to see if there was a previous forward
12857 // declaration or definition.
12858 // FIXME: We're looking into outer scopes here, even when we
12859 // shouldn't be. Doing so can result in ambiguities that we
12860 // shouldn't be diagnosing.
12861 LookupName(Previous, S);
12863 // When declaring or defining a tag, ignore ambiguities introduced
12864 // by types using'ed into this scope.
12865 if (Previous.isAmbiguous() &&
12866 (TUK == TUK_Definition || TUK == TUK_Declaration)) {
12867 LookupResult::Filter F = Previous.makeFilter();
12868 while (F.hasNext()) {
12869 NamedDecl *ND = F.next();
12870 if (!ND->getDeclContext()->getRedeclContext()->Equals(
12871 SearchDC->getRedeclContext()))
12877 // C++11 [namespace.memdef]p3:
12878 // If the name in a friend declaration is neither qualified nor
12879 // a template-id and the declaration is a function or an
12880 // elaborated-type-specifier, the lookup to determine whether
12881 // the entity has been previously declared shall not consider
12882 // any scopes outside the innermost enclosing namespace.
12884 // MSVC doesn't implement the above rule for types, so a friend tag
12885 // declaration may be a redeclaration of a type declared in an enclosing
12886 // scope. They do implement this rule for friend functions.
12888 // Does it matter that this should be by scope instead of by
12889 // semantic context?
12890 if (!Previous.empty() && TUK == TUK_Friend) {
12891 DeclContext *EnclosingNS = SearchDC->getEnclosingNamespaceContext();
12892 LookupResult::Filter F = Previous.makeFilter();
12893 bool FriendSawTagOutsideEnclosingNamespace = false;
12894 while (F.hasNext()) {
12895 NamedDecl *ND = F.next();
12896 DeclContext *DC = ND->getDeclContext()->getRedeclContext();
12897 if (DC->isFileContext() &&
12898 !EnclosingNS->Encloses(ND->getDeclContext())) {
12899 if (getLangOpts().MSVCCompat)
12900 FriendSawTagOutsideEnclosingNamespace = true;
12907 // Diagnose this MSVC extension in the easy case where lookup would have
12908 // unambiguously found something outside the enclosing namespace.
12909 if (Previous.isSingleResult() && FriendSawTagOutsideEnclosingNamespace) {
12910 NamedDecl *ND = Previous.getFoundDecl();
12911 Diag(NameLoc, diag::ext_friend_tag_redecl_outside_namespace)
12912 << createFriendTagNNSFixIt(*this, ND, S, NameLoc);
12916 // Note: there used to be some attempt at recovery here.
12917 if (Previous.isAmbiguous())
12920 if (!getLangOpts().CPlusPlus && TUK != TUK_Reference) {
12921 // FIXME: This makes sure that we ignore the contexts associated
12922 // with C structs, unions, and enums when looking for a matching
12923 // tag declaration or definition. See the similar lookup tweak
12924 // in Sema::LookupName; is there a better way to deal with this?
12925 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC))
12926 SearchDC = SearchDC->getParent();
12930 if (Previous.isSingleResult() &&
12931 Previous.getFoundDecl()->isTemplateParameter()) {
12932 // Maybe we will complain about the shadowed template parameter.
12933 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl());
12934 // Just pretend that we didn't see the previous declaration.
12938 if (getLangOpts().CPlusPlus && Name && DC && StdNamespace &&
12939 DC->Equals(getStdNamespace())) {
12940 if (Name->isStr("bad_alloc")) {
12941 // This is a declaration of or a reference to "std::bad_alloc".
12942 isStdBadAlloc = true;
12944 // If std::bad_alloc has been implicitly declared (but made invisible to
12945 // name lookup), fill in this implicit declaration as the previous
12946 // declaration, so that the declarations get chained appropriately.
12947 if (Previous.empty() && StdBadAlloc)
12948 Previous.addDecl(getStdBadAlloc());
12949 } else if (Name->isStr("align_val_t")) {
12950 isStdAlignValT = true;
12951 if (Previous.empty() && StdAlignValT)
12952 Previous.addDecl(getStdAlignValT());
12956 // If we didn't find a previous declaration, and this is a reference
12957 // (or friend reference), move to the correct scope. In C++, we
12958 // also need to do a redeclaration lookup there, just in case
12959 // there's a shadow friend decl.
12960 if (Name && Previous.empty() &&
12961 (TUK == TUK_Reference || TUK == TUK_Friend)) {
12962 if (Invalid) goto CreateNewDecl;
12963 assert(SS.isEmpty());
12965 if (TUK == TUK_Reference) {
12966 // C++ [basic.scope.pdecl]p5:
12967 // -- for an elaborated-type-specifier of the form
12969 // class-key identifier
12971 // if the elaborated-type-specifier is used in the
12972 // decl-specifier-seq or parameter-declaration-clause of a
12973 // function defined in namespace scope, the identifier is
12974 // declared as a class-name in the namespace that contains
12975 // the declaration; otherwise, except as a friend
12976 // declaration, the identifier is declared in the smallest
12977 // non-class, non-function-prototype scope that contains the
12980 // C99 6.7.2.3p8 has a similar (but not identical!) provision for
12981 // C structs and unions.
12983 // It is an error in C++ to declare (rather than define) an enum
12984 // type, including via an elaborated type specifier. We'll
12985 // diagnose that later; for now, declare the enum in the same
12986 // scope as we would have picked for any other tag type.
12988 // GNU C also supports this behavior as part of its incomplete
12989 // enum types extension, while GNU C++ does not.
12991 // Find the context where we'll be declaring the tag.
12992 // FIXME: We would like to maintain the current DeclContext as the
12993 // lexical context,
12994 SearchDC = getTagInjectionContext(SearchDC);
12996 // Find the scope where we'll be declaring the tag.
12997 S = getTagInjectionScope(S, getLangOpts());
12999 assert(TUK == TUK_Friend);
13000 // C++ [namespace.memdef]p3:
13001 // If a friend declaration in a non-local class first declares a
13002 // class or function, the friend class or function is a member of
13003 // the innermost enclosing namespace.
13004 SearchDC = SearchDC->getEnclosingNamespaceContext();
13007 // In C++, we need to do a redeclaration lookup to properly
13008 // diagnose some problems.
13009 // FIXME: redeclaration lookup is also used (with and without C++) to find a
13010 // hidden declaration so that we don't get ambiguity errors when using a
13011 // type declared by an elaborated-type-specifier. In C that is not correct
13012 // and we should instead merge compatible types found by lookup.
13013 if (getLangOpts().CPlusPlus) {
13014 Previous.setRedeclarationKind(ForRedeclaration);
13015 LookupQualifiedName(Previous, SearchDC);
13017 Previous.setRedeclarationKind(ForRedeclaration);
13018 LookupName(Previous, S);
13022 // If we have a known previous declaration to use, then use it.
13023 if (Previous.empty() && SkipBody && SkipBody->Previous)
13024 Previous.addDecl(SkipBody->Previous);
13026 if (!Previous.empty()) {
13027 NamedDecl *PrevDecl = Previous.getFoundDecl();
13028 NamedDecl *DirectPrevDecl = Previous.getRepresentativeDecl();
13030 // It's okay to have a tag decl in the same scope as a typedef
13031 // which hides a tag decl in the same scope. Finding this
13032 // insanity with a redeclaration lookup can only actually happen
13035 // This is also okay for elaborated-type-specifiers, which is
13036 // technically forbidden by the current standard but which is
13037 // okay according to the likely resolution of an open issue;
13038 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407
13039 if (getLangOpts().CPlusPlus) {
13040 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) {
13041 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) {
13042 TagDecl *Tag = TT->getDecl();
13043 if (Tag->getDeclName() == Name &&
13044 Tag->getDeclContext()->getRedeclContext()
13045 ->Equals(TD->getDeclContext()->getRedeclContext())) {
13048 Previous.addDecl(Tag);
13049 Previous.resolveKind();
13055 // If this is a redeclaration of a using shadow declaration, it must
13056 // declare a tag in the same context. In MSVC mode, we allow a
13057 // redefinition if either context is within the other.
13058 if (auto *Shadow = dyn_cast<UsingShadowDecl>(DirectPrevDecl)) {
13059 auto *OldTag = dyn_cast<TagDecl>(PrevDecl);
13060 if (SS.isEmpty() && TUK != TUK_Reference && TUK != TUK_Friend &&
13061 isDeclInScope(Shadow, SearchDC, S, isExplicitSpecialization) &&
13062 !(OldTag && isAcceptableTagRedeclContext(
13063 *this, OldTag->getDeclContext(), SearchDC))) {
13064 Diag(KWLoc, diag::err_using_decl_conflict_reverse);
13065 Diag(Shadow->getTargetDecl()->getLocation(),
13066 diag::note_using_decl_target);
13067 Diag(Shadow->getUsingDecl()->getLocation(), diag::note_using_decl)
13069 // Recover by ignoring the old declaration.
13071 goto CreateNewDecl;
13075 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) {
13076 // If this is a use of a previous tag, or if the tag is already declared
13077 // in the same scope (so that the definition/declaration completes or
13078 // rementions the tag), reuse the decl.
13079 if (TUK == TUK_Reference || TUK == TUK_Friend ||
13080 isDeclInScope(DirectPrevDecl, SearchDC, S,
13081 SS.isNotEmpty() || isExplicitSpecialization)) {
13082 // Make sure that this wasn't declared as an enum and now used as a
13083 // struct or something similar.
13084 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind,
13085 TUK == TUK_Definition, KWLoc,
13087 bool SafeToContinue
13088 = (PrevTagDecl->getTagKind() != TTK_Enum &&
13090 if (SafeToContinue)
13091 Diag(KWLoc, diag::err_use_with_wrong_tag)
13093 << FixItHint::CreateReplacement(SourceRange(KWLoc),
13094 PrevTagDecl->getKindName());
13096 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name;
13097 Diag(PrevTagDecl->getLocation(), diag::note_previous_use);
13099 if (SafeToContinue)
13100 Kind = PrevTagDecl->getTagKind();
13102 // Recover by making this an anonymous redefinition.
13109 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) {
13110 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl);
13112 // If this is an elaborated-type-specifier for a scoped enumeration,
13113 // the 'class' keyword is not necessary and not permitted.
13114 if (TUK == TUK_Reference || TUK == TUK_Friend) {
13116 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference)
13117 << PrevEnum->isScoped()
13118 << FixItHint::CreateRemoval(ScopedEnumKWLoc);
13119 return PrevTagDecl;
13122 QualType EnumUnderlyingTy;
13123 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>())
13124 EnumUnderlyingTy = TI->getType().getUnqualifiedType();
13125 else if (const Type *T = EnumUnderlying.dyn_cast<const Type*>())
13126 EnumUnderlyingTy = QualType(T, 0);
13128 // All conflicts with previous declarations are recovered by
13129 // returning the previous declaration, unless this is a definition,
13130 // in which case we want the caller to bail out.
13131 if (CheckEnumRedeclaration(NameLoc.isValid() ? NameLoc : KWLoc,
13132 ScopedEnum, EnumUnderlyingTy,
13133 EnumUnderlyingIsImplicit, PrevEnum))
13134 return TUK == TUK_Declaration ? PrevTagDecl : nullptr;
13137 // C++11 [class.mem]p1:
13138 // A member shall not be declared twice in the member-specification,
13139 // except that a nested class or member class template can be declared
13140 // and then later defined.
13141 if (TUK == TUK_Declaration && PrevDecl->isCXXClassMember() &&
13142 S->isDeclScope(PrevDecl)) {
13143 Diag(NameLoc, diag::ext_member_redeclared);
13144 Diag(PrevTagDecl->getLocation(), diag::note_previous_declaration);
13148 // If this is a use, just return the declaration we found, unless
13149 // we have attributes.
13150 if (TUK == TUK_Reference || TUK == TUK_Friend) {
13152 // FIXME: Diagnose these attributes. For now, we create a new
13153 // declaration to hold them.
13154 } else if (TUK == TUK_Reference &&
13155 (PrevTagDecl->getFriendObjectKind() ==
13156 Decl::FOK_Undeclared ||
13157 PP.getModuleContainingLocation(
13158 PrevDecl->getLocation()) !=
13159 PP.getModuleContainingLocation(KWLoc)) &&
13161 // This declaration is a reference to an existing entity, but
13162 // has different visibility from that entity: it either makes
13163 // a friend visible or it makes a type visible in a new module.
13164 // In either case, create a new declaration. We only do this if
13165 // the declaration would have meant the same thing if no prior
13166 // declaration were found, that is, if it was found in the same
13167 // scope where we would have injected a declaration.
13168 if (!getTagInjectionContext(CurContext)->getRedeclContext()
13169 ->Equals(PrevDecl->getDeclContext()->getRedeclContext()))
13170 return PrevTagDecl;
13171 // This is in the injected scope, create a new declaration in
13173 S = getTagInjectionScope(S, getLangOpts());
13175 return PrevTagDecl;
13179 // Diagnose attempts to redefine a tag.
13180 if (TUK == TUK_Definition) {
13181 if (NamedDecl *Def = PrevTagDecl->getDefinition()) {
13182 // If we're defining a specialization and the previous definition
13183 // is from an implicit instantiation, don't emit an error
13184 // here; we'll catch this in the general case below.
13185 bool IsExplicitSpecializationAfterInstantiation = false;
13186 if (isExplicitSpecialization) {
13187 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Def))
13188 IsExplicitSpecializationAfterInstantiation =
13189 RD->getTemplateSpecializationKind() !=
13190 TSK_ExplicitSpecialization;
13191 else if (EnumDecl *ED = dyn_cast<EnumDecl>(Def))
13192 IsExplicitSpecializationAfterInstantiation =
13193 ED->getTemplateSpecializationKind() !=
13194 TSK_ExplicitSpecialization;
13197 NamedDecl *Hidden = nullptr;
13198 if (SkipBody && getLangOpts().CPlusPlus &&
13199 !hasVisibleDefinition(Def, &Hidden)) {
13200 // There is a definition of this tag, but it is not visible. We
13201 // explicitly make use of C++'s one definition rule here, and
13202 // assume that this definition is identical to the hidden one
13203 // we already have. Make the existing definition visible and
13204 // use it in place of this one.
13205 SkipBody->ShouldSkip = true;
13206 makeMergedDefinitionVisible(Hidden, KWLoc);
13208 } else if (!IsExplicitSpecializationAfterInstantiation) {
13209 // A redeclaration in function prototype scope in C isn't
13210 // visible elsewhere, so merely issue a warning.
13211 if (!getLangOpts().CPlusPlus && S->containedInPrototypeScope())
13212 Diag(NameLoc, diag::warn_redefinition_in_param_list) << Name;
13214 Diag(NameLoc, diag::err_redefinition) << Name;
13215 Diag(Def->getLocation(), diag::note_previous_definition);
13216 // If this is a redefinition, recover by making this
13217 // struct be anonymous, which will make any later
13218 // references get the previous definition.
13224 // If the type is currently being defined, complain
13225 // about a nested redefinition.
13226 auto *TD = Context.getTagDeclType(PrevTagDecl)->getAsTagDecl();
13227 if (TD->isBeingDefined()) {
13228 Diag(NameLoc, diag::err_nested_redefinition) << Name;
13229 Diag(PrevTagDecl->getLocation(),
13230 diag::note_previous_definition);
13237 // Okay, this is definition of a previously declared or referenced
13238 // tag. We're going to create a new Decl for it.
13241 // Okay, we're going to make a redeclaration. If this is some kind
13242 // of reference, make sure we build the redeclaration in the same DC
13243 // as the original, and ignore the current access specifier.
13244 if (TUK == TUK_Friend || TUK == TUK_Reference) {
13245 SearchDC = PrevTagDecl->getDeclContext();
13249 // If we get here we have (another) forward declaration or we
13250 // have a definition. Just create a new decl.
13253 // If we get here, this is a definition of a new tag type in a nested
13254 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a
13255 // new decl/type. We set PrevDecl to NULL so that the entities
13256 // have distinct types.
13259 // If we get here, we're going to create a new Decl. If PrevDecl
13260 // is non-NULL, it's a definition of the tag declared by
13261 // PrevDecl. If it's NULL, we have a new definition.
13263 // Otherwise, PrevDecl is not a tag, but was found with tag
13264 // lookup. This is only actually possible in C++, where a few
13265 // things like templates still live in the tag namespace.
13267 // Use a better diagnostic if an elaborated-type-specifier
13268 // found the wrong kind of type on the first
13269 // (non-redeclaration) lookup.
13270 if ((TUK == TUK_Reference || TUK == TUK_Friend) &&
13271 !Previous.isForRedeclaration()) {
13272 NonTagKind NTK = getNonTagTypeDeclKind(PrevDecl, Kind);
13273 Diag(NameLoc, diag::err_tag_reference_non_tag) << PrevDecl << NTK
13275 Diag(PrevDecl->getLocation(), diag::note_declared_at);
13278 // Otherwise, only diagnose if the declaration is in scope.
13279 } else if (!isDeclInScope(DirectPrevDecl, SearchDC, S,
13280 SS.isNotEmpty() || isExplicitSpecialization)) {
13283 // Diagnose implicit declarations introduced by elaborated types.
13284 } else if (TUK == TUK_Reference || TUK == TUK_Friend) {
13285 NonTagKind NTK = getNonTagTypeDeclKind(PrevDecl, Kind);
13286 Diag(NameLoc, diag::err_tag_reference_conflict) << NTK;
13287 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl;
13290 // Otherwise it's a declaration. Call out a particularly common
13292 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) {
13294 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1;
13295 Diag(NameLoc, diag::err_tag_definition_of_typedef)
13296 << Name << Kind << TND->getUnderlyingType();
13297 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl;
13300 // Otherwise, diagnose.
13302 // The tag name clashes with something else in the target scope,
13303 // issue an error and recover by making this tag be anonymous.
13304 Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
13305 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
13310 // The existing declaration isn't relevant to us; we're in a
13311 // new scope, so clear out the previous declaration.
13318 TagDecl *PrevDecl = nullptr;
13319 if (Previous.isSingleResult())
13320 PrevDecl = cast<TagDecl>(Previous.getFoundDecl());
13322 // If there is an identifier, use the location of the identifier as the
13323 // location of the decl, otherwise use the location of the struct/union
13325 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc;
13327 // Otherwise, create a new declaration. If there is a previous
13328 // declaration of the same entity, the two will be linked via
13332 bool IsForwardReference = false;
13333 if (Kind == TTK_Enum) {
13334 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
13335 // enum X { A, B, C } D; D should chain to X.
13336 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name,
13337 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum,
13338 ScopedEnumUsesClassTag, !EnumUnderlying.isNull());
13340 if (isStdAlignValT && (!StdAlignValT || getStdAlignValT()->isImplicit()))
13341 StdAlignValT = cast<EnumDecl>(New);
13343 // If this is an undefined enum, warn.
13344 if (TUK != TUK_Definition && !Invalid) {
13346 if ((getLangOpts().CPlusPlus11 || getLangOpts().ObjC2) &&
13347 cast<EnumDecl>(New)->isFixed()) {
13348 // C++0x: 7.2p2: opaque-enum-declaration.
13349 // Conflicts are diagnosed above. Do nothing.
13351 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) {
13352 Diag(Loc, diag::ext_forward_ref_enum_def)
13354 Diag(Def->getLocation(), diag::note_previous_definition);
13356 unsigned DiagID = diag::ext_forward_ref_enum;
13357 if (getLangOpts().MSVCCompat)
13358 DiagID = diag::ext_ms_forward_ref_enum;
13359 else if (getLangOpts().CPlusPlus)
13360 DiagID = diag::err_forward_ref_enum;
13363 // If this is a forward-declared reference to an enumeration, make a
13364 // note of it; we won't actually be introducing the declaration into
13365 // the declaration context.
13366 if (TUK == TUK_Reference)
13367 IsForwardReference = true;
13371 if (EnumUnderlying) {
13372 EnumDecl *ED = cast<EnumDecl>(New);
13373 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>())
13374 ED->setIntegerTypeSourceInfo(TI);
13376 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0));
13377 ED->setPromotionType(ED->getIntegerType());
13380 // struct/union/class
13382 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
13383 // struct X { int A; } D; D should chain to X.
13384 if (getLangOpts().CPlusPlus) {
13385 // FIXME: Look for a way to use RecordDecl for simple structs.
13386 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name,
13387 cast_or_null<CXXRecordDecl>(PrevDecl));
13389 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit()))
13390 StdBadAlloc = cast<CXXRecordDecl>(New);
13392 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name,
13393 cast_or_null<RecordDecl>(PrevDecl));
13396 // C++11 [dcl.type]p3:
13397 // A type-specifier-seq shall not define a class or enumeration [...].
13398 if (getLangOpts().CPlusPlus && IsTypeSpecifier && TUK == TUK_Definition) {
13399 Diag(New->getLocation(), diag::err_type_defined_in_type_specifier)
13400 << Context.getTagDeclType(New);
13404 // Maybe add qualifier info.
13405 if (SS.isNotEmpty()) {
13407 // If this is either a declaration or a definition, check the
13408 // nested-name-specifier against the current context. We don't do this
13409 // for explicit specializations, because they have similar checking
13410 // (with more specific diagnostics) in the call to
13411 // CheckMemberSpecialization, below.
13412 if (!isExplicitSpecialization &&
13413 (TUK == TUK_Definition || TUK == TUK_Declaration) &&
13414 diagnoseQualifiedDeclaration(SS, DC, OrigName, Loc))
13417 New->setQualifierInfo(SS.getWithLocInContext(Context));
13418 if (TemplateParameterLists.size() > 0) {
13419 New->setTemplateParameterListsInfo(Context, TemplateParameterLists);
13426 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) {
13427 // Add alignment attributes if necessary; these attributes are checked when
13428 // the ASTContext lays out the structure.
13430 // It is important for implementing the correct semantics that this
13431 // happen here (in act on tag decl). The #pragma pack stack is
13432 // maintained as a result of parser callbacks which can occur at
13433 // many points during the parsing of a struct declaration (because
13434 // the #pragma tokens are effectively skipped over during the
13435 // parsing of the struct).
13436 if (TUK == TUK_Definition) {
13437 AddAlignmentAttributesForRecord(RD);
13438 AddMsStructLayoutForRecord(RD);
13442 if (ModulePrivateLoc.isValid()) {
13443 if (isExplicitSpecialization)
13444 Diag(New->getLocation(), diag::err_module_private_specialization)
13446 << FixItHint::CreateRemoval(ModulePrivateLoc);
13447 // __module_private__ does not apply to local classes. However, we only
13448 // diagnose this as an error when the declaration specifiers are
13449 // freestanding. Here, we just ignore the __module_private__.
13450 else if (!SearchDC->isFunctionOrMethod())
13451 New->setModulePrivate();
13454 // If this is a specialization of a member class (of a class template),
13455 // check the specialization.
13456 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous))
13459 // If we're declaring or defining a tag in function prototype scope in C,
13460 // note that this type can only be used within the function and add it to
13461 // the list of decls to inject into the function definition scope.
13462 if ((Name || Kind == TTK_Enum) &&
13463 getNonFieldDeclScope(S)->isFunctionPrototypeScope()) {
13464 if (getLangOpts().CPlusPlus) {
13465 // C++ [dcl.fct]p6:
13466 // Types shall not be defined in return or parameter types.
13467 if (TUK == TUK_Definition && !IsTypeSpecifier) {
13468 Diag(Loc, diag::err_type_defined_in_param_type)
13472 } else if (!PrevDecl) {
13473 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New);
13478 New->setInvalidDecl();
13481 ProcessDeclAttributeList(S, New, Attr);
13483 // Set the lexical context. If the tag has a C++ scope specifier, the
13484 // lexical context will be different from the semantic context.
13485 New->setLexicalDeclContext(CurContext);
13487 // Mark this as a friend decl if applicable.
13488 // In Microsoft mode, a friend declaration also acts as a forward
13489 // declaration so we always pass true to setObjectOfFriendDecl to make
13490 // the tag name visible.
13491 if (TUK == TUK_Friend)
13492 New->setObjectOfFriendDecl(getLangOpts().MSVCCompat);
13494 // Set the access specifier.
13495 if (!Invalid && SearchDC->isRecord())
13496 SetMemberAccessSpecifier(New, PrevDecl, AS);
13498 if (TUK == TUK_Definition)
13499 New->startDefinition();
13501 // If this has an identifier, add it to the scope stack.
13502 if (TUK == TUK_Friend) {
13503 // We might be replacing an existing declaration in the lookup tables;
13504 // if so, borrow its access specifier.
13506 New->setAccess(PrevDecl->getAccess());
13508 DeclContext *DC = New->getDeclContext()->getRedeclContext();
13509 DC->makeDeclVisibleInContext(New);
13510 if (Name) // can be null along some error paths
13511 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
13512 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false);
13514 S = getNonFieldDeclScope(S);
13515 PushOnScopeChains(New, S, !IsForwardReference);
13516 if (IsForwardReference)
13517 SearchDC->makeDeclVisibleInContext(New);
13519 CurContext->addDecl(New);
13522 // If this is the C FILE type, notify the AST context.
13523 if (IdentifierInfo *II = New->getIdentifier())
13524 if (!New->isInvalidDecl() &&
13525 New->getDeclContext()->getRedeclContext()->isTranslationUnit() &&
13527 Context.setFILEDecl(New);
13530 mergeDeclAttributes(New, PrevDecl);
13532 // If there's a #pragma GCC visibility in scope, set the visibility of this
13534 AddPushedVisibilityAttribute(New);
13537 // In C++, don't return an invalid declaration. We can't recover well from
13538 // the cases where we make the type anonymous.
13539 if (Invalid && getLangOpts().CPlusPlus) {
13540 if (New->isBeingDefined())
13541 if (auto RD = dyn_cast<RecordDecl>(New))
13542 RD->completeDefinition();
13549 void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) {
13550 AdjustDeclIfTemplate(TagD);
13551 TagDecl *Tag = cast<TagDecl>(TagD);
13553 // Enter the tag context.
13554 PushDeclContext(S, Tag);
13556 ActOnDocumentableDecl(TagD);
13558 // If there's a #pragma GCC visibility in scope, set the visibility of this
13560 AddPushedVisibilityAttribute(Tag);
13563 Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) {
13564 assert(isa<ObjCContainerDecl>(IDecl) &&
13565 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl");
13566 DeclContext *OCD = cast<DeclContext>(IDecl);
13567 assert(getContainingDC(OCD) == CurContext &&
13568 "The next DeclContext should be lexically contained in the current one.");
13573 void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD,
13574 SourceLocation FinalLoc,
13575 bool IsFinalSpelledSealed,
13576 SourceLocation LBraceLoc) {
13577 AdjustDeclIfTemplate(TagD);
13578 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD);
13580 FieldCollector->StartClass();
13582 if (!Record->getIdentifier())
13585 if (FinalLoc.isValid())
13586 Record->addAttr(new (Context)
13587 FinalAttr(FinalLoc, Context, IsFinalSpelledSealed));
13590 // [...] The class-name is also inserted into the scope of the
13591 // class itself; this is known as the injected-class-name. For
13592 // purposes of access checking, the injected-class-name is treated
13593 // as if it were a public member name.
13594 CXXRecordDecl *InjectedClassName
13595 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext,
13596 Record->getLocStart(), Record->getLocation(),
13597 Record->getIdentifier(),
13598 /*PrevDecl=*/nullptr,
13599 /*DelayTypeCreation=*/true);
13600 Context.getTypeDeclType(InjectedClassName, Record);
13601 InjectedClassName->setImplicit();
13602 InjectedClassName->setAccess(AS_public);
13603 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate())
13604 InjectedClassName->setDescribedClassTemplate(Template);
13605 PushOnScopeChains(InjectedClassName, S);
13606 assert(InjectedClassName->isInjectedClassName() &&
13607 "Broken injected-class-name");
13610 void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD,
13611 SourceRange BraceRange) {
13612 AdjustDeclIfTemplate(TagD);
13613 TagDecl *Tag = cast<TagDecl>(TagD);
13614 Tag->setBraceRange(BraceRange);
13616 // Make sure we "complete" the definition even it is invalid.
13617 if (Tag->isBeingDefined()) {
13618 assert(Tag->isInvalidDecl() && "We should already have completed it");
13619 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag))
13620 RD->completeDefinition();
13623 if (isa<CXXRecordDecl>(Tag))
13624 FieldCollector->FinishClass();
13626 // Exit this scope of this tag's definition.
13629 if (getCurLexicalContext()->isObjCContainer() &&
13630 Tag->getDeclContext()->isFileContext())
13631 Tag->setTopLevelDeclInObjCContainer();
13633 // Notify the consumer that we've defined a tag.
13634 if (!Tag->isInvalidDecl())
13635 Consumer.HandleTagDeclDefinition(Tag);
13638 void Sema::ActOnObjCContainerFinishDefinition() {
13639 // Exit this scope of this interface definition.
13643 void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) {
13644 assert(DC == CurContext && "Mismatch of container contexts");
13645 OriginalLexicalContext = DC;
13646 ActOnObjCContainerFinishDefinition();
13649 void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) {
13650 ActOnObjCContainerStartDefinition(cast<Decl>(DC));
13651 OriginalLexicalContext = nullptr;
13654 void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) {
13655 AdjustDeclIfTemplate(TagD);
13656 TagDecl *Tag = cast<TagDecl>(TagD);
13657 Tag->setInvalidDecl();
13659 // Make sure we "complete" the definition even it is invalid.
13660 if (Tag->isBeingDefined()) {
13661 if (RecordDecl *RD = dyn_cast<RecordDecl>(Tag))
13662 RD->completeDefinition();
13665 // We're undoing ActOnTagStartDefinition here, not
13666 // ActOnStartCXXMemberDeclarations, so we don't have to mess with
13667 // the FieldCollector.
13672 // Note that FieldName may be null for anonymous bitfields.
13673 ExprResult Sema::VerifyBitField(SourceLocation FieldLoc,
13674 IdentifierInfo *FieldName,
13675 QualType FieldTy, bool IsMsStruct,
13676 Expr *BitWidth, bool *ZeroWidth) {
13677 // Default to true; that shouldn't confuse checks for emptiness
13681 // C99 6.7.2.1p4 - verify the field type.
13682 // C++ 9.6p3: A bit-field shall have integral or enumeration type.
13683 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) {
13684 // Handle incomplete types with specific error.
13685 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete))
13686 return ExprError();
13688 return Diag(FieldLoc, diag::err_not_integral_type_bitfield)
13689 << FieldName << FieldTy << BitWidth->getSourceRange();
13690 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield)
13691 << FieldTy << BitWidth->getSourceRange();
13692 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth),
13693 UPPC_BitFieldWidth))
13694 return ExprError();
13696 // If the bit-width is type- or value-dependent, don't try to check
13698 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent())
13701 llvm::APSInt Value;
13702 ExprResult ICE = VerifyIntegerConstantExpression(BitWidth, &Value);
13703 if (ICE.isInvalid())
13705 BitWidth = ICE.get();
13707 if (Value != 0 && ZeroWidth)
13708 *ZeroWidth = false;
13710 // Zero-width bitfield is ok for anonymous field.
13711 if (Value == 0 && FieldName)
13712 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName;
13714 if (Value.isSigned() && Value.isNegative()) {
13716 return Diag(FieldLoc, diag::err_bitfield_has_negative_width)
13717 << FieldName << Value.toString(10);
13718 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width)
13719 << Value.toString(10);
13722 if (!FieldTy->isDependentType()) {
13723 uint64_t TypeStorageSize = Context.getTypeSize(FieldTy);
13724 uint64_t TypeWidth = Context.getIntWidth(FieldTy);
13725 bool BitfieldIsOverwide = Value.ugt(TypeWidth);
13727 // Over-wide bitfields are an error in C or when using the MSVC bitfield
13729 bool CStdConstraintViolation =
13730 BitfieldIsOverwide && !getLangOpts().CPlusPlus;
13731 bool MSBitfieldViolation =
13732 Value.ugt(TypeStorageSize) &&
13733 (IsMsStruct || Context.getTargetInfo().getCXXABI().isMicrosoft());
13734 if (CStdConstraintViolation || MSBitfieldViolation) {
13735 unsigned DiagWidth =
13736 CStdConstraintViolation ? TypeWidth : TypeStorageSize;
13738 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_width)
13739 << FieldName << (unsigned)Value.getZExtValue()
13740 << !CStdConstraintViolation << DiagWidth;
13742 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_width)
13743 << (unsigned)Value.getZExtValue() << !CStdConstraintViolation
13747 // Warn on types where the user might conceivably expect to get all
13748 // specified bits as value bits: that's all integral types other than
13750 if (BitfieldIsOverwide && !FieldTy->isBooleanType()) {
13752 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_width)
13753 << FieldName << (unsigned)Value.getZExtValue()
13754 << (unsigned)TypeWidth;
13756 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_width)
13757 << (unsigned)Value.getZExtValue() << (unsigned)TypeWidth;
13764 /// ActOnField - Each field of a C struct/union is passed into this in order
13765 /// to create a FieldDecl object for it.
13766 Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart,
13767 Declarator &D, Expr *BitfieldWidth) {
13768 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD),
13769 DeclStart, D, static_cast<Expr*>(BitfieldWidth),
13770 /*InitStyle=*/ICIS_NoInit, AS_public);
13774 /// HandleField - Analyze a field of a C struct or a C++ data member.
13776 FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record,
13777 SourceLocation DeclStart,
13778 Declarator &D, Expr *BitWidth,
13779 InClassInitStyle InitStyle,
13780 AccessSpecifier AS) {
13781 if (D.isDecompositionDeclarator()) {
13782 const DecompositionDeclarator &Decomp = D.getDecompositionDeclarator();
13783 Diag(Decomp.getLSquareLoc(), diag::err_decomp_decl_context)
13784 << Decomp.getSourceRange();
13788 IdentifierInfo *II = D.getIdentifier();
13789 SourceLocation Loc = DeclStart;
13790 if (II) Loc = D.getIdentifierLoc();
13792 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
13793 QualType T = TInfo->getType();
13794 if (getLangOpts().CPlusPlus) {
13795 CheckExtraCXXDefaultArguments(D);
13797 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
13798 UPPC_DataMemberType)) {
13799 D.setInvalidType();
13801 TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
13805 // TR 18037 does not allow fields to be declared with address spaces.
13806 if (T.getQualifiers().hasAddressSpace()) {
13807 Diag(Loc, diag::err_field_with_address_space);
13808 D.setInvalidType();
13811 // OpenCL v1.2 s6.9b,r & OpenCL v2.0 s6.12.5 - The following types cannot be
13812 // used as structure or union field: image, sampler, event or block types.
13813 if (LangOpts.OpenCL && (T->isEventT() || T->isImageType() ||
13814 T->isSamplerT() || T->isBlockPointerType())) {
13815 Diag(Loc, diag::err_opencl_type_struct_or_union_field) << T;
13816 D.setInvalidType();
13819 DiagnoseFunctionSpecifiers(D.getDeclSpec());
13821 if (D.getDeclSpec().isInlineSpecified())
13822 Diag(D.getDeclSpec().getInlineSpecLoc(), diag::err_inline_non_function)
13823 << getLangOpts().CPlusPlus1z;
13824 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec())
13825 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(),
13826 diag::err_invalid_thread)
13827 << DeclSpec::getSpecifierName(TSCS);
13829 // Check to see if this name was declared as a member previously
13830 NamedDecl *PrevDecl = nullptr;
13831 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration);
13832 LookupName(Previous, S);
13833 switch (Previous.getResultKind()) {
13834 case LookupResult::Found:
13835 case LookupResult::FoundUnresolvedValue:
13836 PrevDecl = Previous.getAsSingle<NamedDecl>();
13839 case LookupResult::FoundOverloaded:
13840 PrevDecl = Previous.getRepresentativeDecl();
13843 case LookupResult::NotFound:
13844 case LookupResult::NotFoundInCurrentInstantiation:
13845 case LookupResult::Ambiguous:
13848 Previous.suppressDiagnostics();
13850 if (PrevDecl && PrevDecl->isTemplateParameter()) {
13851 // Maybe we will complain about the shadowed template parameter.
13852 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
13853 // Just pretend that we didn't see the previous declaration.
13854 PrevDecl = nullptr;
13857 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S))
13858 PrevDecl = nullptr;
13861 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable);
13862 SourceLocation TSSL = D.getLocStart();
13864 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, InitStyle,
13865 TSSL, AS, PrevDecl, &D);
13867 if (NewFD->isInvalidDecl())
13868 Record->setInvalidDecl();
13870 if (D.getDeclSpec().isModulePrivateSpecified())
13871 NewFD->setModulePrivate();
13873 if (NewFD->isInvalidDecl() && PrevDecl) {
13874 // Don't introduce NewFD into scope; there's already something
13875 // with the same name in the same scope.
13877 PushOnScopeChains(NewFD, S);
13879 Record->addDecl(NewFD);
13884 /// \brief Build a new FieldDecl and check its well-formedness.
13886 /// This routine builds a new FieldDecl given the fields name, type,
13887 /// record, etc. \p PrevDecl should refer to any previous declaration
13888 /// with the same name and in the same scope as the field to be
13891 /// \returns a new FieldDecl.
13893 /// \todo The Declarator argument is a hack. It will be removed once
13894 FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T,
13895 TypeSourceInfo *TInfo,
13896 RecordDecl *Record, SourceLocation Loc,
13897 bool Mutable, Expr *BitWidth,
13898 InClassInitStyle InitStyle,
13899 SourceLocation TSSL,
13900 AccessSpecifier AS, NamedDecl *PrevDecl,
13902 IdentifierInfo *II = Name.getAsIdentifierInfo();
13903 bool InvalidDecl = false;
13904 if (D) InvalidDecl = D->isInvalidType();
13906 // If we receive a broken type, recover by assuming 'int' and
13907 // marking this declaration as invalid.
13909 InvalidDecl = true;
13913 QualType EltTy = Context.getBaseElementType(T);
13914 if (!EltTy->isDependentType()) {
13915 if (RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) {
13916 // Fields of incomplete type force their record to be invalid.
13917 Record->setInvalidDecl();
13918 InvalidDecl = true;
13921 EltTy->isIncompleteType(&Def);
13922 if (Def && Def->isInvalidDecl()) {
13923 Record->setInvalidDecl();
13924 InvalidDecl = true;
13929 // OpenCL v1.2 s6.9.c: bitfields are not supported.
13930 if (BitWidth && getLangOpts().OpenCL) {
13931 Diag(Loc, diag::err_opencl_bitfields);
13932 InvalidDecl = true;
13935 // C99 6.7.2.1p8: A member of a structure or union may have any type other
13936 // than a variably modified type.
13937 if (!InvalidDecl && T->isVariablyModifiedType()) {
13938 bool SizeIsNegative;
13939 llvm::APSInt Oversized;
13941 TypeSourceInfo *FixedTInfo =
13942 TryToFixInvalidVariablyModifiedTypeSourceInfo(TInfo, Context,
13946 Diag(Loc, diag::warn_illegal_constant_array_size);
13947 TInfo = FixedTInfo;
13948 T = FixedTInfo->getType();
13950 if (SizeIsNegative)
13951 Diag(Loc, diag::err_typecheck_negative_array_size);
13952 else if (Oversized.getBoolValue())
13953 Diag(Loc, diag::err_array_too_large)
13954 << Oversized.toString(10);
13956 Diag(Loc, diag::err_typecheck_field_variable_size);
13957 InvalidDecl = true;
13961 // Fields can not have abstract class types
13962 if (!InvalidDecl && RequireNonAbstractType(Loc, T,
13963 diag::err_abstract_type_in_decl,
13964 AbstractFieldType))
13965 InvalidDecl = true;
13967 bool ZeroWidth = false;
13969 BitWidth = nullptr;
13970 // If this is declared as a bit-field, check the bit-field.
13972 BitWidth = VerifyBitField(Loc, II, T, Record->isMsStruct(Context), BitWidth,
13975 InvalidDecl = true;
13976 BitWidth = nullptr;
13981 // Check that 'mutable' is consistent with the type of the declaration.
13982 if (!InvalidDecl && Mutable) {
13983 unsigned DiagID = 0;
13984 if (T->isReferenceType())
13985 DiagID = getLangOpts().MSVCCompat ? diag::ext_mutable_reference
13986 : diag::err_mutable_reference;
13987 else if (T.isConstQualified())
13988 DiagID = diag::err_mutable_const;
13991 SourceLocation ErrLoc = Loc;
13992 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid())
13993 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc();
13994 Diag(ErrLoc, DiagID);
13995 if (DiagID != diag::ext_mutable_reference) {
13997 InvalidDecl = true;
14002 // C++11 [class.union]p8 (DR1460):
14003 // At most one variant member of a union may have a
14004 // brace-or-equal-initializer.
14005 if (InitStyle != ICIS_NoInit)
14006 checkDuplicateDefaultInit(*this, cast<CXXRecordDecl>(Record), Loc);
14008 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo,
14009 BitWidth, Mutable, InitStyle);
14011 NewFD->setInvalidDecl();
14013 if (PrevDecl && !isa<TagDecl>(PrevDecl)) {
14014 Diag(Loc, diag::err_duplicate_member) << II;
14015 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
14016 NewFD->setInvalidDecl();
14019 if (!InvalidDecl && getLangOpts().CPlusPlus) {
14020 if (Record->isUnion()) {
14021 if (const RecordType *RT = EltTy->getAs<RecordType>()) {
14022 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl());
14023 if (RDecl->getDefinition()) {
14024 // C++ [class.union]p1: An object of a class with a non-trivial
14025 // constructor, a non-trivial copy constructor, a non-trivial
14026 // destructor, or a non-trivial copy assignment operator
14027 // cannot be a member of a union, nor can an array of such
14029 if (CheckNontrivialField(NewFD))
14030 NewFD->setInvalidDecl();
14034 // C++ [class.union]p1: If a union contains a member of reference type,
14035 // the program is ill-formed, except when compiling with MSVC extensions
14037 if (EltTy->isReferenceType()) {
14038 Diag(NewFD->getLocation(), getLangOpts().MicrosoftExt ?
14039 diag::ext_union_member_of_reference_type :
14040 diag::err_union_member_of_reference_type)
14041 << NewFD->getDeclName() << EltTy;
14042 if (!getLangOpts().MicrosoftExt)
14043 NewFD->setInvalidDecl();
14048 // FIXME: We need to pass in the attributes given an AST
14049 // representation, not a parser representation.
14051 // FIXME: The current scope is almost... but not entirely... correct here.
14052 ProcessDeclAttributes(getCurScope(), NewFD, *D);
14054 if (NewFD->hasAttrs())
14055 CheckAlignasUnderalignment(NewFD);
14058 // In auto-retain/release, infer strong retension for fields of
14059 // retainable type.
14060 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewFD))
14061 NewFD->setInvalidDecl();
14063 if (T.isObjCGCWeak())
14064 Diag(Loc, diag::warn_attribute_weak_on_field);
14066 NewFD->setAccess(AS);
14070 bool Sema::CheckNontrivialField(FieldDecl *FD) {
14072 assert(getLangOpts().CPlusPlus && "valid check only for C++");
14074 if (FD->isInvalidDecl() || FD->getType()->isDependentType())
14077 QualType EltTy = Context.getBaseElementType(FD->getType());
14078 if (const RecordType *RT = EltTy->getAs<RecordType>()) {
14079 CXXRecordDecl *RDecl = cast<CXXRecordDecl>(RT->getDecl());
14080 if (RDecl->getDefinition()) {
14081 // We check for copy constructors before constructors
14082 // because otherwise we'll never get complaints about
14083 // copy constructors.
14085 CXXSpecialMember member = CXXInvalid;
14086 // We're required to check for any non-trivial constructors. Since the
14087 // implicit default constructor is suppressed if there are any
14088 // user-declared constructors, we just need to check that there is a
14089 // trivial default constructor and a trivial copy constructor. (We don't
14090 // worry about move constructors here, since this is a C++98 check.)
14091 if (RDecl->hasNonTrivialCopyConstructor())
14092 member = CXXCopyConstructor;
14093 else if (!RDecl->hasTrivialDefaultConstructor())
14094 member = CXXDefaultConstructor;
14095 else if (RDecl->hasNonTrivialCopyAssignment())
14096 member = CXXCopyAssignment;
14097 else if (RDecl->hasNonTrivialDestructor())
14098 member = CXXDestructor;
14100 if (member != CXXInvalid) {
14101 if (!getLangOpts().CPlusPlus11 &&
14102 getLangOpts().ObjCAutoRefCount && RDecl->hasObjectMember()) {
14103 // Objective-C++ ARC: it is an error to have a non-trivial field of
14104 // a union. However, system headers in Objective-C programs
14105 // occasionally have Objective-C lifetime objects within unions,
14106 // and rather than cause the program to fail, we make those
14107 // members unavailable.
14108 SourceLocation Loc = FD->getLocation();
14109 if (getSourceManager().isInSystemHeader(Loc)) {
14110 if (!FD->hasAttr<UnavailableAttr>())
14111 FD->addAttr(UnavailableAttr::CreateImplicit(Context, "",
14112 UnavailableAttr::IR_ARCFieldWithOwnership, Loc));
14117 Diag(FD->getLocation(), getLangOpts().CPlusPlus11 ?
14118 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member :
14119 diag::err_illegal_union_or_anon_struct_member)
14120 << FD->getParent()->isUnion() << FD->getDeclName() << member;
14121 DiagnoseNontrivial(RDecl, member);
14122 return !getLangOpts().CPlusPlus11;
14130 /// TranslateIvarVisibility - Translate visibility from a token ID to an
14131 /// AST enum value.
14132 static ObjCIvarDecl::AccessControl
14133 TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) {
14134 switch (ivarVisibility) {
14135 default: llvm_unreachable("Unknown visitibility kind");
14136 case tok::objc_private: return ObjCIvarDecl::Private;
14137 case tok::objc_public: return ObjCIvarDecl::Public;
14138 case tok::objc_protected: return ObjCIvarDecl::Protected;
14139 case tok::objc_package: return ObjCIvarDecl::Package;
14143 /// ActOnIvar - Each ivar field of an objective-c class is passed into this
14144 /// in order to create an IvarDecl object for it.
14145 Decl *Sema::ActOnIvar(Scope *S,
14146 SourceLocation DeclStart,
14147 Declarator &D, Expr *BitfieldWidth,
14148 tok::ObjCKeywordKind Visibility) {
14150 IdentifierInfo *II = D.getIdentifier();
14151 Expr *BitWidth = (Expr*)BitfieldWidth;
14152 SourceLocation Loc = DeclStart;
14153 if (II) Loc = D.getIdentifierLoc();
14155 // FIXME: Unnamed fields can be handled in various different ways, for
14156 // example, unnamed unions inject all members into the struct namespace!
14158 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
14159 QualType T = TInfo->getType();
14162 // 6.7.2.1p3, 6.7.2.1p4
14163 BitWidth = VerifyBitField(Loc, II, T, /*IsMsStruct*/false, BitWidth).get();
14165 D.setInvalidType();
14172 if (T->isReferenceType()) {
14173 Diag(Loc, diag::err_ivar_reference_type);
14174 D.setInvalidType();
14176 // C99 6.7.2.1p8: A member of a structure or union may have any type other
14177 // than a variably modified type.
14178 else if (T->isVariablyModifiedType()) {
14179 Diag(Loc, diag::err_typecheck_ivar_variable_size);
14180 D.setInvalidType();
14183 // Get the visibility (access control) for this ivar.
14184 ObjCIvarDecl::AccessControl ac =
14185 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility)
14186 : ObjCIvarDecl::None;
14187 // Must set ivar's DeclContext to its enclosing interface.
14188 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext);
14189 if (!EnclosingDecl || EnclosingDecl->isInvalidDecl())
14191 ObjCContainerDecl *EnclosingContext;
14192 if (ObjCImplementationDecl *IMPDecl =
14193 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
14194 if (LangOpts.ObjCRuntime.isFragile()) {
14195 // Case of ivar declared in an implementation. Context is that of its class.
14196 EnclosingContext = IMPDecl->getClassInterface();
14197 assert(EnclosingContext && "Implementation has no class interface!");
14200 EnclosingContext = EnclosingDecl;
14202 if (ObjCCategoryDecl *CDecl =
14203 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
14204 if (LangOpts.ObjCRuntime.isFragile() || !CDecl->IsClassExtension()) {
14205 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension();
14209 EnclosingContext = EnclosingDecl;
14212 // Construct the decl.
14213 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext,
14214 DeclStart, Loc, II, T,
14215 TInfo, ac, (Expr *)BitfieldWidth);
14218 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName,
14220 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S)
14221 && !isa<TagDecl>(PrevDecl)) {
14222 Diag(Loc, diag::err_duplicate_member) << II;
14223 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
14224 NewID->setInvalidDecl();
14228 // Process attributes attached to the ivar.
14229 ProcessDeclAttributes(S, NewID, D);
14231 if (D.isInvalidType())
14232 NewID->setInvalidDecl();
14234 // In ARC, infer 'retaining' for ivars of retainable type.
14235 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(NewID))
14236 NewID->setInvalidDecl();
14238 if (D.getDeclSpec().isModulePrivateSpecified())
14239 NewID->setModulePrivate();
14242 // FIXME: When interfaces are DeclContexts, we'll need to add
14243 // these to the interface.
14245 IdResolver.AddDecl(NewID);
14248 if (LangOpts.ObjCRuntime.isNonFragile() &&
14249 !NewID->isInvalidDecl() && isa<ObjCInterfaceDecl>(EnclosingDecl))
14250 Diag(Loc, diag::warn_ivars_in_interface);
14255 /// ActOnLastBitfield - This routine handles synthesized bitfields rules for
14256 /// class and class extensions. For every class \@interface and class
14257 /// extension \@interface, if the last ivar is a bitfield of any type,
14258 /// then add an implicit `char :0` ivar to the end of that interface.
14259 void Sema::ActOnLastBitfield(SourceLocation DeclLoc,
14260 SmallVectorImpl<Decl *> &AllIvarDecls) {
14261 if (LangOpts.ObjCRuntime.isFragile() || AllIvarDecls.empty())
14264 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1];
14265 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl);
14267 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0)
14269 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext);
14271 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) {
14272 if (!CD->IsClassExtension())
14275 // No need to add this to end of @implementation.
14279 // All conditions are met. Add a new bitfield to the tail end of ivars.
14280 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0);
14281 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc);
14283 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext),
14284 DeclLoc, DeclLoc, nullptr,
14286 Context.getTrivialTypeSourceInfo(Context.CharTy,
14288 ObjCIvarDecl::Private, BW,
14290 AllIvarDecls.push_back(Ivar);
14293 void Sema::ActOnFields(Scope *S, SourceLocation RecLoc, Decl *EnclosingDecl,
14294 ArrayRef<Decl *> Fields, SourceLocation LBrac,
14295 SourceLocation RBrac, AttributeList *Attr) {
14296 assert(EnclosingDecl && "missing record or interface decl");
14298 // If this is an Objective-C @implementation or category and we have
14299 // new fields here we should reset the layout of the interface since
14300 // it will now change.
14301 if (!Fields.empty() && isa<ObjCContainerDecl>(EnclosingDecl)) {
14302 ObjCContainerDecl *DC = cast<ObjCContainerDecl>(EnclosingDecl);
14303 switch (DC->getKind()) {
14305 case Decl::ObjCCategory:
14306 Context.ResetObjCLayout(cast<ObjCCategoryDecl>(DC)->getClassInterface());
14308 case Decl::ObjCImplementation:
14310 ResetObjCLayout(cast<ObjCImplementationDecl>(DC)->getClassInterface());
14315 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl);
14317 // Start counting up the number of named members; make sure to include
14318 // members of anonymous structs and unions in the total.
14319 unsigned NumNamedMembers = 0;
14321 for (const auto *I : Record->decls()) {
14322 if (const auto *IFD = dyn_cast<IndirectFieldDecl>(I))
14323 if (IFD->getDeclName())
14328 // Verify that all the fields are okay.
14329 SmallVector<FieldDecl*, 32> RecFields;
14331 bool ARCErrReported = false;
14332 for (ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end();
14334 FieldDecl *FD = cast<FieldDecl>(*i);
14336 // Get the type for the field.
14337 const Type *FDTy = FD->getType().getTypePtr();
14339 if (!FD->isAnonymousStructOrUnion()) {
14340 // Remember all fields written by the user.
14341 RecFields.push_back(FD);
14344 // If the field is already invalid for some reason, don't emit more
14345 // diagnostics about it.
14346 if (FD->isInvalidDecl()) {
14347 EnclosingDecl->setInvalidDecl();
14352 // A structure or union shall not contain a member with
14353 // incomplete or function type (hence, a structure shall not
14354 // contain an instance of itself, but may contain a pointer to
14355 // an instance of itself), except that the last member of a
14356 // structure with more than one named member may have incomplete
14357 // array type; such a structure (and any union containing,
14358 // possibly recursively, a member that is such a structure)
14359 // shall not be a member of a structure or an element of an
14361 if (FDTy->isFunctionType()) {
14362 // Field declared as a function.
14363 Diag(FD->getLocation(), diag::err_field_declared_as_function)
14364 << FD->getDeclName();
14365 FD->setInvalidDecl();
14366 EnclosingDecl->setInvalidDecl();
14368 } else if (FDTy->isIncompleteArrayType() && Record &&
14369 ((i + 1 == Fields.end() && !Record->isUnion()) ||
14370 ((getLangOpts().MicrosoftExt ||
14371 getLangOpts().CPlusPlus) &&
14372 (i + 1 == Fields.end() || Record->isUnion())))) {
14373 // Flexible array member.
14374 // Microsoft and g++ is more permissive regarding flexible array.
14375 // It will accept flexible array in union and also
14376 // as the sole element of a struct/class.
14377 unsigned DiagID = 0;
14378 if (Record->isUnion())
14379 DiagID = getLangOpts().MicrosoftExt
14380 ? diag::ext_flexible_array_union_ms
14381 : getLangOpts().CPlusPlus
14382 ? diag::ext_flexible_array_union_gnu
14383 : diag::err_flexible_array_union;
14384 else if (NumNamedMembers < 1)
14385 DiagID = getLangOpts().MicrosoftExt
14386 ? diag::ext_flexible_array_empty_aggregate_ms
14387 : getLangOpts().CPlusPlus
14388 ? diag::ext_flexible_array_empty_aggregate_gnu
14389 : diag::err_flexible_array_empty_aggregate;
14392 Diag(FD->getLocation(), DiagID) << FD->getDeclName()
14393 << Record->getTagKind();
14394 // While the layout of types that contain virtual bases is not specified
14395 // by the C++ standard, both the Itanium and Microsoft C++ ABIs place
14396 // virtual bases after the derived members. This would make a flexible
14397 // array member declared at the end of an object not adjacent to the end
14399 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Record))
14400 if (RD->getNumVBases() != 0)
14401 Diag(FD->getLocation(), diag::err_flexible_array_virtual_base)
14402 << FD->getDeclName() << Record->getTagKind();
14403 if (!getLangOpts().C99)
14404 Diag(FD->getLocation(), diag::ext_c99_flexible_array_member)
14405 << FD->getDeclName() << Record->getTagKind();
14407 // If the element type has a non-trivial destructor, we would not
14408 // implicitly destroy the elements, so disallow it for now.
14410 // FIXME: GCC allows this. We should probably either implicitly delete
14411 // the destructor of the containing class, or just allow this.
14412 QualType BaseElem = Context.getBaseElementType(FD->getType());
14413 if (!BaseElem->isDependentType() && BaseElem.isDestructedType()) {
14414 Diag(FD->getLocation(), diag::err_flexible_array_has_nontrivial_dtor)
14415 << FD->getDeclName() << FD->getType();
14416 FD->setInvalidDecl();
14417 EnclosingDecl->setInvalidDecl();
14420 // Okay, we have a legal flexible array member at the end of the struct.
14421 Record->setHasFlexibleArrayMember(true);
14422 } else if (!FDTy->isDependentType() &&
14423 RequireCompleteType(FD->getLocation(), FD->getType(),
14424 diag::err_field_incomplete)) {
14426 FD->setInvalidDecl();
14427 EnclosingDecl->setInvalidDecl();
14429 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) {
14430 if (Record && FDTTy->getDecl()->hasFlexibleArrayMember()) {
14431 // A type which contains a flexible array member is considered to be a
14432 // flexible array member.
14433 Record->setHasFlexibleArrayMember(true);
14434 if (!Record->isUnion()) {
14435 // If this is a struct/class and this is not the last element, reject
14436 // it. Note that GCC supports variable sized arrays in the middle of
14438 if (i + 1 != Fields.end())
14439 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct)
14440 << FD->getDeclName() << FD->getType();
14442 // We support flexible arrays at the end of structs in
14443 // other structs as an extension.
14444 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct)
14445 << FD->getDeclName();
14449 if (isa<ObjCContainerDecl>(EnclosingDecl) &&
14450 RequireNonAbstractType(FD->getLocation(), FD->getType(),
14451 diag::err_abstract_type_in_decl,
14452 AbstractIvarType)) {
14453 // Ivars can not have abstract class types
14454 FD->setInvalidDecl();
14456 if (Record && FDTTy->getDecl()->hasObjectMember())
14457 Record->setHasObjectMember(true);
14458 if (Record && FDTTy->getDecl()->hasVolatileMember())
14459 Record->setHasVolatileMember(true);
14460 } else if (FDTy->isObjCObjectType()) {
14461 /// A field cannot be an Objective-c object
14462 Diag(FD->getLocation(), diag::err_statically_allocated_object)
14463 << FixItHint::CreateInsertion(FD->getLocation(), "*");
14464 QualType T = Context.getObjCObjectPointerType(FD->getType());
14466 } else if (getLangOpts().ObjCAutoRefCount && Record && !ARCErrReported &&
14467 (!getLangOpts().CPlusPlus || Record->isUnion())) {
14468 // It's an error in ARC if a field has lifetime.
14469 // We don't want to report this in a system header, though,
14470 // so we just make the field unavailable.
14471 // FIXME: that's really not sufficient; we need to make the type
14472 // itself invalid to, say, initialize or copy.
14473 QualType T = FD->getType();
14474 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime();
14475 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) {
14476 SourceLocation loc = FD->getLocation();
14477 if (getSourceManager().isInSystemHeader(loc)) {
14478 if (!FD->hasAttr<UnavailableAttr>()) {
14479 FD->addAttr(UnavailableAttr::CreateImplicit(Context, "",
14480 UnavailableAttr::IR_ARCFieldWithOwnership, loc));
14483 Diag(FD->getLocation(), diag::err_arc_objc_object_in_tag)
14484 << T->isBlockPointerType() << Record->getTagKind();
14486 ARCErrReported = true;
14488 } else if (getLangOpts().ObjC1 &&
14489 getLangOpts().getGC() != LangOptions::NonGC &&
14490 Record && !Record->hasObjectMember()) {
14491 if (FD->getType()->isObjCObjectPointerType() ||
14492 FD->getType().isObjCGCStrong())
14493 Record->setHasObjectMember(true);
14494 else if (Context.getAsArrayType(FD->getType())) {
14495 QualType BaseType = Context.getBaseElementType(FD->getType());
14496 if (BaseType->isRecordType() &&
14497 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember())
14498 Record->setHasObjectMember(true);
14499 else if (BaseType->isObjCObjectPointerType() ||
14500 BaseType.isObjCGCStrong())
14501 Record->setHasObjectMember(true);
14504 if (Record && FD->getType().isVolatileQualified())
14505 Record->setHasVolatileMember(true);
14506 // Keep track of the number of named members.
14507 if (FD->getIdentifier())
14511 // Okay, we successfully defined 'Record'.
14513 bool Completed = false;
14514 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) {
14515 if (!CXXRecord->isInvalidDecl()) {
14516 // Set access bits correctly on the directly-declared conversions.
14517 for (CXXRecordDecl::conversion_iterator
14518 I = CXXRecord->conversion_begin(),
14519 E = CXXRecord->conversion_end(); I != E; ++I)
14520 I.setAccess((*I)->getAccess());
14523 if (!CXXRecord->isDependentType()) {
14524 if (CXXRecord->hasUserDeclaredDestructor()) {
14525 // Adjust user-defined destructor exception spec.
14526 if (getLangOpts().CPlusPlus11)
14527 AdjustDestructorExceptionSpec(CXXRecord,
14528 CXXRecord->getDestructor());
14531 if (!CXXRecord->isInvalidDecl()) {
14532 // Add any implicitly-declared members to this class.
14533 AddImplicitlyDeclaredMembersToClass(CXXRecord);
14535 // If we have virtual base classes, we may end up finding multiple
14536 // final overriders for a given virtual function. Check for this
14538 if (CXXRecord->getNumVBases()) {
14539 CXXFinalOverriderMap FinalOverriders;
14540 CXXRecord->getFinalOverriders(FinalOverriders);
14542 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(),
14543 MEnd = FinalOverriders.end();
14545 for (OverridingMethods::iterator SO = M->second.begin(),
14546 SOEnd = M->second.end();
14547 SO != SOEnd; ++SO) {
14548 assert(SO->second.size() > 0 &&
14549 "Virtual function without overridding functions?");
14550 if (SO->second.size() == 1)
14553 // C++ [class.virtual]p2:
14554 // In a derived class, if a virtual member function of a base
14555 // class subobject has more than one final overrider the
14556 // program is ill-formed.
14557 Diag(Record->getLocation(), diag::err_multiple_final_overriders)
14558 << (const NamedDecl *)M->first << Record;
14559 Diag(M->first->getLocation(),
14560 diag::note_overridden_virtual_function);
14561 for (OverridingMethods::overriding_iterator
14562 OM = SO->second.begin(),
14563 OMEnd = SO->second.end();
14565 Diag(OM->Method->getLocation(), diag::note_final_overrider)
14566 << (const NamedDecl *)M->first << OM->Method->getParent();
14568 Record->setInvalidDecl();
14571 CXXRecord->completeDefinition(&FinalOverriders);
14579 Record->completeDefinition();
14581 // We may have deferred checking for a deleted destructor. Check now.
14582 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) {
14583 auto *Dtor = CXXRecord->getDestructor();
14584 if (Dtor && Dtor->isImplicit() &&
14585 ShouldDeleteSpecialMember(Dtor, CXXDestructor))
14586 SetDeclDeleted(Dtor, CXXRecord->getLocation());
14589 if (Record->hasAttrs()) {
14590 CheckAlignasUnderalignment(Record);
14592 if (const MSInheritanceAttr *IA = Record->getAttr<MSInheritanceAttr>())
14593 checkMSInheritanceAttrOnDefinition(cast<CXXRecordDecl>(Record),
14594 IA->getRange(), IA->getBestCase(),
14595 IA->getSemanticSpelling());
14598 // Check if the structure/union declaration is a type that can have zero
14599 // size in C. For C this is a language extension, for C++ it may cause
14600 // compatibility problems.
14601 bool CheckForZeroSize;
14602 if (!getLangOpts().CPlusPlus) {
14603 CheckForZeroSize = true;
14605 // For C++ filter out types that cannot be referenced in C code.
14606 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record);
14608 CXXRecord->getLexicalDeclContext()->isExternCContext() &&
14609 !CXXRecord->isDependentType() &&
14610 CXXRecord->isCLike();
14612 if (CheckForZeroSize) {
14613 bool ZeroSize = true;
14614 bool IsEmpty = true;
14615 unsigned NonBitFields = 0;
14616 for (RecordDecl::field_iterator I = Record->field_begin(),
14617 E = Record->field_end();
14618 (NonBitFields == 0 || ZeroSize) && I != E; ++I) {
14620 if (I->isUnnamedBitfield()) {
14621 if (I->getBitWidthValue(Context) > 0)
14625 QualType FieldType = I->getType();
14626 if (FieldType->isIncompleteType() ||
14627 !Context.getTypeSizeInChars(FieldType).isZero())
14632 // Empty structs are an extension in C (C99 6.7.2.1p7). They are
14633 // allowed in C++, but warn if its declaration is inside
14634 // extern "C" block.
14636 Diag(RecLoc, getLangOpts().CPlusPlus ?
14637 diag::warn_zero_size_struct_union_in_extern_c :
14638 diag::warn_zero_size_struct_union_compat)
14639 << IsEmpty << Record->isUnion() << (NonBitFields > 1);
14642 // Structs without named members are extension in C (C99 6.7.2.1p7),
14643 // but are accepted by GCC.
14644 if (NonBitFields == 0 && !getLangOpts().CPlusPlus) {
14645 Diag(RecLoc, IsEmpty ? diag::ext_empty_struct_union :
14646 diag::ext_no_named_members_in_struct_union)
14647 << Record->isUnion();
14651 ObjCIvarDecl **ClsFields =
14652 reinterpret_cast<ObjCIvarDecl**>(RecFields.data());
14653 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) {
14654 ID->setEndOfDefinitionLoc(RBrac);
14655 // Add ivar's to class's DeclContext.
14656 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
14657 ClsFields[i]->setLexicalDeclContext(ID);
14658 ID->addDecl(ClsFields[i]);
14660 // Must enforce the rule that ivars in the base classes may not be
14662 if (ID->getSuperClass())
14663 DiagnoseDuplicateIvars(ID, ID->getSuperClass());
14664 } else if (ObjCImplementationDecl *IMPDecl =
14665 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
14666 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl");
14667 for (unsigned I = 0, N = RecFields.size(); I != N; ++I)
14668 // Ivar declared in @implementation never belongs to the implementation.
14669 // Only it is in implementation's lexical context.
14670 ClsFields[I]->setLexicalDeclContext(IMPDecl);
14671 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac);
14672 IMPDecl->setIvarLBraceLoc(LBrac);
14673 IMPDecl->setIvarRBraceLoc(RBrac);
14674 } else if (ObjCCategoryDecl *CDecl =
14675 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
14676 // case of ivars in class extension; all other cases have been
14677 // reported as errors elsewhere.
14678 // FIXME. Class extension does not have a LocEnd field.
14679 // CDecl->setLocEnd(RBrac);
14680 // Add ivar's to class extension's DeclContext.
14681 // Diagnose redeclaration of private ivars.
14682 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface();
14683 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
14685 if (const ObjCIvarDecl *ClsIvar =
14686 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) {
14687 Diag(ClsFields[i]->getLocation(),
14688 diag::err_duplicate_ivar_declaration);
14689 Diag(ClsIvar->getLocation(), diag::note_previous_definition);
14692 for (const auto *Ext : IDecl->known_extensions()) {
14693 if (const ObjCIvarDecl *ClsExtIvar
14694 = Ext->getIvarDecl(ClsFields[i]->getIdentifier())) {
14695 Diag(ClsFields[i]->getLocation(),
14696 diag::err_duplicate_ivar_declaration);
14697 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition);
14702 ClsFields[i]->setLexicalDeclContext(CDecl);
14703 CDecl->addDecl(ClsFields[i]);
14705 CDecl->setIvarLBraceLoc(LBrac);
14706 CDecl->setIvarRBraceLoc(RBrac);
14711 ProcessDeclAttributeList(S, Record, Attr);
14714 /// \brief Determine whether the given integral value is representable within
14715 /// the given type T.
14716 static bool isRepresentableIntegerValue(ASTContext &Context,
14717 llvm::APSInt &Value,
14719 assert(T->isIntegralType(Context) && "Integral type required!");
14720 unsigned BitWidth = Context.getIntWidth(T);
14722 if (Value.isUnsigned() || Value.isNonNegative()) {
14723 if (T->isSignedIntegerOrEnumerationType())
14725 return Value.getActiveBits() <= BitWidth;
14727 return Value.getMinSignedBits() <= BitWidth;
14730 // \brief Given an integral type, return the next larger integral type
14731 // (or a NULL type of no such type exists).
14732 static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) {
14733 // FIXME: Int128/UInt128 support, which also needs to be introduced into
14734 // enum checking below.
14735 assert(T->isIntegralType(Context) && "Integral type required!");
14736 const unsigned NumTypes = 4;
14737 QualType SignedIntegralTypes[NumTypes] = {
14738 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy
14740 QualType UnsignedIntegralTypes[NumTypes] = {
14741 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy,
14742 Context.UnsignedLongLongTy
14745 unsigned BitWidth = Context.getTypeSize(T);
14746 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes
14747 : UnsignedIntegralTypes;
14748 for (unsigned I = 0; I != NumTypes; ++I)
14749 if (Context.getTypeSize(Types[I]) > BitWidth)
14755 EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum,
14756 EnumConstantDecl *LastEnumConst,
14757 SourceLocation IdLoc,
14758 IdentifierInfo *Id,
14760 unsigned IntWidth = Context.getTargetInfo().getIntWidth();
14761 llvm::APSInt EnumVal(IntWidth);
14764 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue))
14768 Val = DefaultLvalueConversion(Val).get();
14771 if (Enum->isDependentType() || Val->isTypeDependent())
14772 EltTy = Context.DependentTy;
14774 SourceLocation ExpLoc;
14775 if (getLangOpts().CPlusPlus11 && Enum->isFixed() &&
14776 !getLangOpts().MSVCCompat) {
14777 // C++11 [dcl.enum]p5: If the underlying type is fixed, [...] the
14778 // constant-expression in the enumerator-definition shall be a converted
14779 // constant expression of the underlying type.
14780 EltTy = Enum->getIntegerType();
14781 ExprResult Converted =
14782 CheckConvertedConstantExpression(Val, EltTy, EnumVal,
14784 if (Converted.isInvalid())
14787 Val = Converted.get();
14788 } else if (!Val->isValueDependent() &&
14789 !(Val = VerifyIntegerConstantExpression(Val,
14790 &EnumVal).get())) {
14791 // C99 6.7.2.2p2: Make sure we have an integer constant expression.
14793 if (Enum->isFixed()) {
14794 EltTy = Enum->getIntegerType();
14796 // In Obj-C and Microsoft mode, require the enumeration value to be
14797 // representable in the underlying type of the enumeration. In C++11,
14798 // we perform a non-narrowing conversion as part of converted constant
14799 // expression checking.
14800 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) {
14801 if (getLangOpts().MSVCCompat) {
14802 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy;
14803 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).get();
14805 Diag(IdLoc, diag::err_enumerator_too_large) << EltTy;
14807 Val = ImpCastExprToType(Val, EltTy,
14808 EltTy->isBooleanType() ?
14809 CK_IntegralToBoolean : CK_IntegralCast)
14811 } else if (getLangOpts().CPlusPlus) {
14812 // C++11 [dcl.enum]p5:
14813 // If the underlying type is not fixed, the type of each enumerator
14814 // is the type of its initializing value:
14815 // - If an initializer is specified for an enumerator, the
14816 // initializing value has the same type as the expression.
14817 EltTy = Val->getType();
14820 // The expression that defines the value of an enumeration constant
14821 // shall be an integer constant expression that has a value
14822 // representable as an int.
14824 // Complain if the value is not representable in an int.
14825 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy))
14826 Diag(IdLoc, diag::ext_enum_value_not_int)
14827 << EnumVal.toString(10) << Val->getSourceRange()
14828 << (EnumVal.isUnsigned() || EnumVal.isNonNegative());
14829 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) {
14830 // Force the type of the expression to 'int'.
14831 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).get();
14833 EltTy = Val->getType();
14840 if (Enum->isDependentType())
14841 EltTy = Context.DependentTy;
14842 else if (!LastEnumConst) {
14843 // C++0x [dcl.enum]p5:
14844 // If the underlying type is not fixed, the type of each enumerator
14845 // is the type of its initializing value:
14846 // - If no initializer is specified for the first enumerator, the
14847 // initializing value has an unspecified integral type.
14849 // GCC uses 'int' for its unspecified integral type, as does
14851 if (Enum->isFixed()) {
14852 EltTy = Enum->getIntegerType();
14855 EltTy = Context.IntTy;
14858 // Assign the last value + 1.
14859 EnumVal = LastEnumConst->getInitVal();
14861 EltTy = LastEnumConst->getType();
14863 // Check for overflow on increment.
14864 if (EnumVal < LastEnumConst->getInitVal()) {
14865 // C++0x [dcl.enum]p5:
14866 // If the underlying type is not fixed, the type of each enumerator
14867 // is the type of its initializing value:
14869 // - Otherwise the type of the initializing value is the same as
14870 // the type of the initializing value of the preceding enumerator
14871 // unless the incremented value is not representable in that type,
14872 // in which case the type is an unspecified integral type
14873 // sufficient to contain the incremented value. If no such type
14874 // exists, the program is ill-formed.
14875 QualType T = getNextLargerIntegralType(Context, EltTy);
14876 if (T.isNull() || Enum->isFixed()) {
14877 // There is no integral type larger enough to represent this
14878 // value. Complain, then allow the value to wrap around.
14879 EnumVal = LastEnumConst->getInitVal();
14880 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2);
14882 if (Enum->isFixed())
14883 // When the underlying type is fixed, this is ill-formed.
14884 Diag(IdLoc, diag::err_enumerator_wrapped)
14885 << EnumVal.toString(10)
14888 Diag(IdLoc, diag::ext_enumerator_increment_too_large)
14889 << EnumVal.toString(10);
14894 // Retrieve the last enumerator's value, extent that type to the
14895 // type that is supposed to be large enough to represent the incremented
14896 // value, then increment.
14897 EnumVal = LastEnumConst->getInitVal();
14898 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType());
14899 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy));
14902 // If we're not in C++, diagnose the overflow of enumerator values,
14903 // which in C99 means that the enumerator value is not representable in
14904 // an int (C99 6.7.2.2p2). However, we support GCC's extension that
14905 // permits enumerator values that are representable in some larger
14907 if (!getLangOpts().CPlusPlus && !T.isNull())
14908 Diag(IdLoc, diag::warn_enum_value_overflow);
14909 } else if (!getLangOpts().CPlusPlus &&
14910 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) {
14911 // Enforce C99 6.7.2.2p2 even when we compute the next value.
14912 Diag(IdLoc, diag::ext_enum_value_not_int)
14913 << EnumVal.toString(10) << 1;
14918 if (!EltTy->isDependentType()) {
14919 // Make the enumerator value match the signedness and size of the
14920 // enumerator's type.
14921 EnumVal = EnumVal.extOrTrunc(Context.getIntWidth(EltTy));
14922 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType());
14925 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy,
14929 Sema::SkipBodyInfo Sema::shouldSkipAnonEnumBody(Scope *S, IdentifierInfo *II,
14930 SourceLocation IILoc) {
14931 if (!(getLangOpts().Modules || getLangOpts().ModulesLocalVisibility) ||
14932 !getLangOpts().CPlusPlus)
14933 return SkipBodyInfo();
14935 // We have an anonymous enum definition. Look up the first enumerator to
14936 // determine if we should merge the definition with an existing one and
14938 NamedDecl *PrevDecl = LookupSingleName(S, II, IILoc, LookupOrdinaryName,
14940 auto *PrevECD = dyn_cast_or_null<EnumConstantDecl>(PrevDecl);
14942 return SkipBodyInfo();
14944 EnumDecl *PrevED = cast<EnumDecl>(PrevECD->getDeclContext());
14946 if (!PrevED->getDeclName() && !hasVisibleDefinition(PrevED, &Hidden)) {
14948 Skip.Previous = Hidden;
14952 return SkipBodyInfo();
14955 Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst,
14956 SourceLocation IdLoc, IdentifierInfo *Id,
14957 AttributeList *Attr,
14958 SourceLocation EqualLoc, Expr *Val) {
14959 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl);
14960 EnumConstantDecl *LastEnumConst =
14961 cast_or_null<EnumConstantDecl>(lastEnumConst);
14963 // The scope passed in may not be a decl scope. Zip up the scope tree until
14964 // we find one that is.
14965 S = getNonFieldDeclScope(S);
14967 // Verify that there isn't already something declared with this name in this
14969 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName,
14971 if (PrevDecl && PrevDecl->isTemplateParameter()) {
14972 // Maybe we will complain about the shadowed template parameter.
14973 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl);
14974 // Just pretend that we didn't see the previous declaration.
14975 PrevDecl = nullptr;
14978 // C++ [class.mem]p15:
14979 // If T is the name of a class, then each of the following shall have a name
14980 // different from T:
14981 // - every enumerator of every member of class T that is an unscoped
14983 if (!TheEnumDecl->isScoped())
14984 DiagnoseClassNameShadow(TheEnumDecl->getDeclContext(),
14985 DeclarationNameInfo(Id, IdLoc));
14987 EnumConstantDecl *New =
14988 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val);
14993 // When in C++, we may get a TagDecl with the same name; in this case the
14994 // enum constant will 'hide' the tag.
14995 assert((getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) &&
14996 "Received TagDecl when not in C++!");
14997 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S) &&
14998 shouldLinkPossiblyHiddenDecl(PrevDecl, New)) {
14999 if (isa<EnumConstantDecl>(PrevDecl))
15000 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id;
15002 Diag(IdLoc, diag::err_redefinition) << Id;
15003 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
15008 // Process attributes.
15009 if (Attr) ProcessDeclAttributeList(S, New, Attr);
15011 // Register this decl in the current scope stack.
15012 New->setAccess(TheEnumDecl->getAccess());
15013 PushOnScopeChains(New, S);
15015 ActOnDocumentableDecl(New);
15020 // Returns true when the enum initial expression does not trigger the
15021 // duplicate enum warning. A few common cases are exempted as follows:
15022 // Element2 = Element1
15023 // Element2 = Element1 + 1
15024 // Element2 = Element1 - 1
15025 // Where Element2 and Element1 are from the same enum.
15026 static bool ValidDuplicateEnum(EnumConstantDecl *ECD, EnumDecl *Enum) {
15027 Expr *InitExpr = ECD->getInitExpr();
15030 InitExpr = InitExpr->IgnoreImpCasts();
15032 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(InitExpr)) {
15033 if (!BO->isAdditiveOp())
15035 IntegerLiteral *IL = dyn_cast<IntegerLiteral>(BO->getRHS());
15038 if (IL->getValue() != 1)
15041 InitExpr = BO->getLHS();
15044 // This checks if the elements are from the same enum.
15045 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(InitExpr);
15049 EnumConstantDecl *EnumConstant = dyn_cast<EnumConstantDecl>(DRE->getDecl());
15053 if (cast<EnumDecl>(TagDecl::castFromDeclContext(ECD->getDeclContext())) !=
15063 bool isTombstoneOrEmptyKey;
15064 DupKey(int64_t val, bool isTombstoneOrEmptyKey)
15065 : val(val), isTombstoneOrEmptyKey(isTombstoneOrEmptyKey) {}
15068 static DupKey GetDupKey(const llvm::APSInt& Val) {
15069 return DupKey(Val.isSigned() ? Val.getSExtValue() : Val.getZExtValue(),
15073 struct DenseMapInfoDupKey {
15074 static DupKey getEmptyKey() { return DupKey(0, true); }
15075 static DupKey getTombstoneKey() { return DupKey(1, true); }
15076 static unsigned getHashValue(const DupKey Key) {
15077 return (unsigned)(Key.val * 37);
15079 static bool isEqual(const DupKey& LHS, const DupKey& RHS) {
15080 return LHS.isTombstoneOrEmptyKey == RHS.isTombstoneOrEmptyKey &&
15081 LHS.val == RHS.val;
15084 } // end anonymous namespace
15086 // Emits a warning when an element is implicitly set a value that
15087 // a previous element has already been set to.
15088 static void CheckForDuplicateEnumValues(Sema &S, ArrayRef<Decl *> Elements,
15090 QualType EnumType) {
15091 if (S.Diags.isIgnored(diag::warn_duplicate_enum_values, Enum->getLocation()))
15093 // Avoid anonymous enums
15094 if (!Enum->getIdentifier())
15097 // Only check for small enums.
15098 if (Enum->getNumPositiveBits() > 63 || Enum->getNumNegativeBits() > 64)
15101 typedef SmallVector<EnumConstantDecl *, 3> ECDVector;
15102 typedef SmallVector<ECDVector *, 3> DuplicatesVector;
15104 typedef llvm::PointerUnion<EnumConstantDecl*, ECDVector*> DeclOrVector;
15105 typedef llvm::DenseMap<DupKey, DeclOrVector, DenseMapInfoDupKey>
15108 DuplicatesVector DupVector;
15109 ValueToVectorMap EnumMap;
15111 // Populate the EnumMap with all values represented by enum constants without
15113 for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
15114 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]);
15116 // Null EnumConstantDecl means a previous diagnostic has been emitted for
15117 // this constant. Skip this enum since it may be ill-formed.
15122 if (ECD->getInitExpr())
15125 DupKey Key = GetDupKey(ECD->getInitVal());
15126 DeclOrVector &Entry = EnumMap[Key];
15128 // First time encountering this value.
15129 if (Entry.isNull())
15133 // Create vectors for any values that has duplicates.
15134 for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
15135 EnumConstantDecl *ECD = cast<EnumConstantDecl>(Elements[i]);
15136 if (!ValidDuplicateEnum(ECD, Enum))
15139 DupKey Key = GetDupKey(ECD->getInitVal());
15141 DeclOrVector& Entry = EnumMap[Key];
15142 if (Entry.isNull())
15145 if (EnumConstantDecl *D = Entry.dyn_cast<EnumConstantDecl*>()) {
15146 // Ensure constants are different.
15150 // Create new vector and push values onto it.
15151 ECDVector *Vec = new ECDVector();
15153 Vec->push_back(ECD);
15155 // Update entry to point to the duplicates vector.
15158 // Store the vector somewhere we can consult later for quick emission of
15160 DupVector.push_back(Vec);
15164 ECDVector *Vec = Entry.get<ECDVector*>();
15165 // Make sure constants are not added more than once.
15166 if (*Vec->begin() == ECD)
15169 Vec->push_back(ECD);
15172 // Emit diagnostics.
15173 for (DuplicatesVector::iterator DupVectorIter = DupVector.begin(),
15174 DupVectorEnd = DupVector.end();
15175 DupVectorIter != DupVectorEnd; ++DupVectorIter) {
15176 ECDVector *Vec = *DupVectorIter;
15177 assert(Vec->size() > 1 && "ECDVector should have at least 2 elements.");
15179 // Emit warning for one enum constant.
15180 ECDVector::iterator I = Vec->begin();
15181 S.Diag((*I)->getLocation(), diag::warn_duplicate_enum_values)
15182 << (*I)->getName() << (*I)->getInitVal().toString(10)
15183 << (*I)->getSourceRange();
15186 // Emit one note for each of the remaining enum constants with
15188 for (ECDVector::iterator E = Vec->end(); I != E; ++I)
15189 S.Diag((*I)->getLocation(), diag::note_duplicate_element)
15190 << (*I)->getName() << (*I)->getInitVal().toString(10)
15191 << (*I)->getSourceRange();
15196 bool Sema::IsValueInFlagEnum(const EnumDecl *ED, const llvm::APInt &Val,
15197 bool AllowMask) const {
15198 assert(ED->hasAttr<FlagEnumAttr>() && "looking for value in non-flag enum");
15199 assert(ED->isCompleteDefinition() && "expected enum definition");
15201 auto R = FlagBitsCache.insert(std::make_pair(ED, llvm::APInt()));
15202 llvm::APInt &FlagBits = R.first->second;
15205 for (auto *E : ED->enumerators()) {
15206 const auto &EVal = E->getInitVal();
15207 // Only single-bit enumerators introduce new flag values.
15208 if (EVal.isPowerOf2())
15209 FlagBits = FlagBits.zextOrSelf(EVal.getBitWidth()) | EVal;
15213 // A value is in a flag enum if either its bits are a subset of the enum's
15214 // flag bits (the first condition) or we are allowing masks and the same is
15215 // true of its complement (the second condition). When masks are allowed, we
15216 // allow the common idiom of ~(enum1 | enum2) to be a valid enum value.
15218 // While it's true that any value could be used as a mask, the assumption is
15219 // that a mask will have all of the insignificant bits set. Anything else is
15220 // likely a logic error.
15221 llvm::APInt FlagMask = ~FlagBits.zextOrTrunc(Val.getBitWidth());
15222 return !(FlagMask & Val) || (AllowMask && !(FlagMask & ~Val));
15225 void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceRange BraceRange,
15227 ArrayRef<Decl *> Elements,
15228 Scope *S, AttributeList *Attr) {
15229 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX);
15230 QualType EnumType = Context.getTypeDeclType(Enum);
15233 ProcessDeclAttributeList(S, Enum, Attr);
15235 if (Enum->isDependentType()) {
15236 for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
15237 EnumConstantDecl *ECD =
15238 cast_or_null<EnumConstantDecl>(Elements[i]);
15239 if (!ECD) continue;
15241 ECD->setType(EnumType);
15244 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0);
15248 // TODO: If the result value doesn't fit in an int, it must be a long or long
15249 // long value. ISO C does not support this, but GCC does as an extension,
15251 unsigned IntWidth = Context.getTargetInfo().getIntWidth();
15252 unsigned CharWidth = Context.getTargetInfo().getCharWidth();
15253 unsigned ShortWidth = Context.getTargetInfo().getShortWidth();
15255 // Verify that all the values are okay, compute the size of the values, and
15256 // reverse the list.
15257 unsigned NumNegativeBits = 0;
15258 unsigned NumPositiveBits = 0;
15260 // Keep track of whether all elements have type int.
15261 bool AllElementsInt = true;
15263 for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
15264 EnumConstantDecl *ECD =
15265 cast_or_null<EnumConstantDecl>(Elements[i]);
15266 if (!ECD) continue; // Already issued a diagnostic.
15268 const llvm::APSInt &InitVal = ECD->getInitVal();
15270 // Keep track of the size of positive and negative values.
15271 if (InitVal.isUnsigned() || InitVal.isNonNegative())
15272 NumPositiveBits = std::max(NumPositiveBits,
15273 (unsigned)InitVal.getActiveBits());
15275 NumNegativeBits = std::max(NumNegativeBits,
15276 (unsigned)InitVal.getMinSignedBits());
15278 // Keep track of whether every enum element has type int (very commmon).
15279 if (AllElementsInt)
15280 AllElementsInt = ECD->getType() == Context.IntTy;
15283 // Figure out the type that should be used for this enum.
15285 unsigned BestWidth;
15287 // C++0x N3000 [conv.prom]p3:
15288 // An rvalue of an unscoped enumeration type whose underlying
15289 // type is not fixed can be converted to an rvalue of the first
15290 // of the following types that can represent all the values of
15291 // the enumeration: int, unsigned int, long int, unsigned long
15292 // int, long long int, or unsigned long long int.
15294 // An identifier declared as an enumeration constant has type int.
15295 // The C99 rule is modified by a gcc extension
15296 QualType BestPromotionType;
15298 bool Packed = Enum->hasAttr<PackedAttr>();
15299 // -fshort-enums is the equivalent to specifying the packed attribute on all
15300 // enum definitions.
15301 if (LangOpts.ShortEnums)
15304 if (Enum->isFixed()) {
15305 BestType = Enum->getIntegerType();
15306 if (BestType->isPromotableIntegerType())
15307 BestPromotionType = Context.getPromotedIntegerType(BestType);
15309 BestPromotionType = BestType;
15311 BestWidth = Context.getIntWidth(BestType);
15313 else if (NumNegativeBits) {
15314 // If there is a negative value, figure out the smallest integer type (of
15315 // int/long/longlong) that fits.
15316 // If it's packed, check also if it fits a char or a short.
15317 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) {
15318 BestType = Context.SignedCharTy;
15319 BestWidth = CharWidth;
15320 } else if (Packed && NumNegativeBits <= ShortWidth &&
15321 NumPositiveBits < ShortWidth) {
15322 BestType = Context.ShortTy;
15323 BestWidth = ShortWidth;
15324 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) {
15325 BestType = Context.IntTy;
15326 BestWidth = IntWidth;
15328 BestWidth = Context.getTargetInfo().getLongWidth();
15330 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) {
15331 BestType = Context.LongTy;
15333 BestWidth = Context.getTargetInfo().getLongLongWidth();
15335 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth)
15336 Diag(Enum->getLocation(), diag::ext_enum_too_large);
15337 BestType = Context.LongLongTy;
15340 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType);
15342 // If there is no negative value, figure out the smallest type that fits
15343 // all of the enumerator values.
15344 // If it's packed, check also if it fits a char or a short.
15345 if (Packed && NumPositiveBits <= CharWidth) {
15346 BestType = Context.UnsignedCharTy;
15347 BestPromotionType = Context.IntTy;
15348 BestWidth = CharWidth;
15349 } else if (Packed && NumPositiveBits <= ShortWidth) {
15350 BestType = Context.UnsignedShortTy;
15351 BestPromotionType = Context.IntTy;
15352 BestWidth = ShortWidth;
15353 } else if (NumPositiveBits <= IntWidth) {
15354 BestType = Context.UnsignedIntTy;
15355 BestWidth = IntWidth;
15357 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus)
15358 ? Context.UnsignedIntTy : Context.IntTy;
15359 } else if (NumPositiveBits <=
15360 (BestWidth = Context.getTargetInfo().getLongWidth())) {
15361 BestType = Context.UnsignedLongTy;
15363 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus)
15364 ? Context.UnsignedLongTy : Context.LongTy;
15366 BestWidth = Context.getTargetInfo().getLongLongWidth();
15367 assert(NumPositiveBits <= BestWidth &&
15368 "How could an initializer get larger than ULL?");
15369 BestType = Context.UnsignedLongLongTy;
15371 = (NumPositiveBits == BestWidth || !getLangOpts().CPlusPlus)
15372 ? Context.UnsignedLongLongTy : Context.LongLongTy;
15376 // Loop over all of the enumerator constants, changing their types to match
15377 // the type of the enum if needed.
15378 for (auto *D : Elements) {
15379 auto *ECD = cast_or_null<EnumConstantDecl>(D);
15380 if (!ECD) continue; // Already issued a diagnostic.
15382 // Standard C says the enumerators have int type, but we allow, as an
15383 // extension, the enumerators to be larger than int size. If each
15384 // enumerator value fits in an int, type it as an int, otherwise type it the
15385 // same as the enumerator decl itself. This means that in "enum { X = 1U }"
15386 // that X has type 'int', not 'unsigned'.
15388 // Determine whether the value fits into an int.
15389 llvm::APSInt InitVal = ECD->getInitVal();
15391 // If it fits into an integer type, force it. Otherwise force it to match
15392 // the enum decl type.
15396 if (!getLangOpts().CPlusPlus &&
15397 !Enum->isFixed() &&
15398 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) {
15399 NewTy = Context.IntTy;
15400 NewWidth = IntWidth;
15402 } else if (ECD->getType() == BestType) {
15403 // Already the right type!
15404 if (getLangOpts().CPlusPlus)
15405 // C++ [dcl.enum]p4: Following the closing brace of an
15406 // enum-specifier, each enumerator has the type of its
15408 ECD->setType(EnumType);
15412 NewWidth = BestWidth;
15413 NewSign = BestType->isSignedIntegerOrEnumerationType();
15416 // Adjust the APSInt value.
15417 InitVal = InitVal.extOrTrunc(NewWidth);
15418 InitVal.setIsSigned(NewSign);
15419 ECD->setInitVal(InitVal);
15421 // Adjust the Expr initializer and type.
15422 if (ECD->getInitExpr() &&
15423 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType()))
15424 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy,
15426 ECD->getInitExpr(),
15427 /*base paths*/ nullptr,
15429 if (getLangOpts().CPlusPlus)
15430 // C++ [dcl.enum]p4: Following the closing brace of an
15431 // enum-specifier, each enumerator has the type of its
15433 ECD->setType(EnumType);
15435 ECD->setType(NewTy);
15438 Enum->completeDefinition(BestType, BestPromotionType,
15439 NumPositiveBits, NumNegativeBits);
15441 CheckForDuplicateEnumValues(*this, Elements, Enum, EnumType);
15443 if (Enum->hasAttr<FlagEnumAttr>()) {
15444 for (Decl *D : Elements) {
15445 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(D);
15446 if (!ECD) continue; // Already issued a diagnostic.
15448 llvm::APSInt InitVal = ECD->getInitVal();
15449 if (InitVal != 0 && !InitVal.isPowerOf2() &&
15450 !IsValueInFlagEnum(Enum, InitVal, true))
15451 Diag(ECD->getLocation(), diag::warn_flag_enum_constant_out_of_range)
15456 // Now that the enum type is defined, ensure it's not been underaligned.
15457 if (Enum->hasAttrs())
15458 CheckAlignasUnderalignment(Enum);
15461 Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr,
15462 SourceLocation StartLoc,
15463 SourceLocation EndLoc) {
15464 StringLiteral *AsmString = cast<StringLiteral>(expr);
15466 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext,
15467 AsmString, StartLoc,
15469 CurContext->addDecl(New);
15473 static void checkModuleImportContext(Sema &S, Module *M,
15474 SourceLocation ImportLoc, DeclContext *DC,
15475 bool FromInclude = false) {
15476 SourceLocation ExternCLoc;
15478 if (auto *LSD = dyn_cast<LinkageSpecDecl>(DC)) {
15479 switch (LSD->getLanguage()) {
15480 case LinkageSpecDecl::lang_c:
15481 if (ExternCLoc.isInvalid())
15482 ExternCLoc = LSD->getLocStart();
15484 case LinkageSpecDecl::lang_cxx:
15487 DC = LSD->getParent();
15490 while (isa<LinkageSpecDecl>(DC))
15491 DC = DC->getParent();
15493 if (!isa<TranslationUnitDecl>(DC)) {
15494 S.Diag(ImportLoc, (FromInclude && S.isModuleVisible(M))
15495 ? diag::ext_module_import_not_at_top_level_noop
15496 : diag::err_module_import_not_at_top_level_fatal)
15497 << M->getFullModuleName() << DC;
15498 S.Diag(cast<Decl>(DC)->getLocStart(),
15499 diag::note_module_import_not_at_top_level) << DC;
15500 } else if (!M->IsExternC && ExternCLoc.isValid()) {
15501 S.Diag(ImportLoc, diag::ext_module_import_in_extern_c)
15502 << M->getFullModuleName();
15503 S.Diag(ExternCLoc, diag::note_extern_c_begins_here);
15507 Sema::DeclGroupPtrTy Sema::ActOnModuleDecl(SourceLocation ModuleLoc,
15508 ModuleDeclKind MDK,
15509 ModuleIdPath Path) {
15510 // 'module implementation' requires that we are not compiling a module of any
15511 // kind. 'module' and 'module partition' require that we are compiling a
15512 // module inteface (not a module map).
15513 auto CMK = getLangOpts().getCompilingModule();
15514 if (MDK == ModuleDeclKind::Implementation
15515 ? CMK != LangOptions::CMK_None
15516 : CMK != LangOptions::CMK_ModuleInterface) {
15517 Diag(ModuleLoc, diag::err_module_interface_implementation_mismatch)
15522 // FIXME: Create a ModuleDecl and return it.
15524 // FIXME: Most of this work should be done by the preprocessor rather than
15525 // here, in case we look ahead across something where the current
15526 // module matters (eg a #include).
15528 // The dots in a module name in the Modules TS are a lie. Unlike Clang's
15529 // hierarchical module map modules, the dots here are just another character
15530 // that can appear in a module name. Flatten down to the actual module name.
15531 std::string ModuleName;
15532 for (auto &Piece : Path) {
15533 if (!ModuleName.empty())
15535 ModuleName += Piece.first->getName();
15538 // If a module name was explicitly specified on the command line, it must be
15540 if (!getLangOpts().CurrentModule.empty() &&
15541 getLangOpts().CurrentModule != ModuleName) {
15542 Diag(Path.front().second, diag::err_current_module_name_mismatch)
15543 << SourceRange(Path.front().second, Path.back().second)
15544 << getLangOpts().CurrentModule;
15547 const_cast<LangOptions&>(getLangOpts()).CurrentModule = ModuleName;
15549 auto &Map = PP.getHeaderSearchInfo().getModuleMap();
15552 case ModuleDeclKind::Module: {
15553 // FIXME: Check we're not in a submodule.
15555 // We can't have imported a definition of this module or parsed a module
15556 // map defining it already.
15557 if (auto *M = Map.findModule(ModuleName)) {
15558 Diag(Path[0].second, diag::err_module_redefinition) << ModuleName;
15559 if (M->DefinitionLoc.isValid())
15560 Diag(M->DefinitionLoc, diag::note_prev_module_definition);
15561 else if (const auto *FE = M->getASTFile())
15562 Diag(M->DefinitionLoc, diag::note_prev_module_definition_from_ast_file)
15567 // Create a Module for the module that we're defining.
15568 Module *Mod = Map.createModuleForInterfaceUnit(ModuleLoc, ModuleName);
15569 assert(Mod && "module creation should not fail");
15571 // Enter the semantic scope of the module.
15572 ActOnModuleBegin(ModuleLoc, Mod);
15576 case ModuleDeclKind::Partition:
15577 // FIXME: Check we are in a submodule of the named module.
15580 case ModuleDeclKind::Implementation:
15581 std::pair<IdentifierInfo *, SourceLocation> ModuleNameLoc(
15582 PP.getIdentifierInfo(ModuleName), Path[0].second);
15584 DeclResult Import = ActOnModuleImport(ModuleLoc, ModuleLoc, ModuleNameLoc);
15585 if (Import.isInvalid())
15587 return ConvertDeclToDeclGroup(Import.get());
15590 llvm_unreachable("unexpected module decl kind");
15593 DeclResult Sema::ActOnModuleImport(SourceLocation StartLoc,
15594 SourceLocation ImportLoc,
15595 ModuleIdPath Path) {
15597 getModuleLoader().loadModule(ImportLoc, Path, Module::AllVisible,
15598 /*IsIncludeDirective=*/false);
15602 VisibleModules.setVisible(Mod, ImportLoc);
15604 checkModuleImportContext(*this, Mod, ImportLoc, CurContext);
15606 // FIXME: we should support importing a submodule within a different submodule
15607 // of the same top-level module. Until we do, make it an error rather than
15608 // silently ignoring the import.
15609 // Import-from-implementation is valid in the Modules TS. FIXME: Should we
15610 // warn on a redundant import of the current module?
15611 if (Mod->getTopLevelModuleName() == getLangOpts().CurrentModule &&
15612 (getLangOpts().isCompilingModule() || !getLangOpts().ModulesTS))
15613 Diag(ImportLoc, getLangOpts().isCompilingModule()
15614 ? diag::err_module_self_import
15615 : diag::err_module_import_in_implementation)
15616 << Mod->getFullModuleName() << getLangOpts().CurrentModule;
15618 SmallVector<SourceLocation, 2> IdentifierLocs;
15619 Module *ModCheck = Mod;
15620 for (unsigned I = 0, N = Path.size(); I != N; ++I) {
15621 // If we've run out of module parents, just drop the remaining identifiers.
15622 // We need the length to be consistent.
15625 ModCheck = ModCheck->Parent;
15627 IdentifierLocs.push_back(Path[I].second);
15630 TranslationUnitDecl *TU = getASTContext().getTranslationUnitDecl();
15631 ImportDecl *Import = ImportDecl::Create(Context, TU, StartLoc,
15632 Mod, IdentifierLocs);
15633 if (!ModuleScopes.empty())
15634 Context.addModuleInitializer(ModuleScopes.back().Module, Import);
15635 TU->addDecl(Import);
15639 void Sema::ActOnModuleInclude(SourceLocation DirectiveLoc, Module *Mod) {
15640 checkModuleImportContext(*this, Mod, DirectiveLoc, CurContext, true);
15641 BuildModuleInclude(DirectiveLoc, Mod);
15644 void Sema::BuildModuleInclude(SourceLocation DirectiveLoc, Module *Mod) {
15645 // Determine whether we're in the #include buffer for a module. The #includes
15646 // in that buffer do not qualify as module imports; they're just an
15647 // implementation detail of us building the module.
15649 // FIXME: Should we even get ActOnModuleInclude calls for those?
15650 bool IsInModuleIncludes =
15651 TUKind == TU_Module &&
15652 getSourceManager().isWrittenInMainFile(DirectiveLoc);
15654 bool ShouldAddImport = !IsInModuleIncludes;
15656 // If this module import was due to an inclusion directive, create an
15657 // implicit import declaration to capture it in the AST.
15658 if (ShouldAddImport) {
15659 TranslationUnitDecl *TU = getASTContext().getTranslationUnitDecl();
15660 ImportDecl *ImportD = ImportDecl::CreateImplicit(getASTContext(), TU,
15663 if (!ModuleScopes.empty())
15664 Context.addModuleInitializer(ModuleScopes.back().Module, ImportD);
15665 TU->addDecl(ImportD);
15666 Consumer.HandleImplicitImportDecl(ImportD);
15669 getModuleLoader().makeModuleVisible(Mod, Module::AllVisible, DirectiveLoc);
15670 VisibleModules.setVisible(Mod, DirectiveLoc);
15673 void Sema::ActOnModuleBegin(SourceLocation DirectiveLoc, Module *Mod) {
15674 checkModuleImportContext(*this, Mod, DirectiveLoc, CurContext, true);
15676 ModuleScopes.push_back({});
15677 ModuleScopes.back().Module = Mod;
15678 if (getLangOpts().ModulesLocalVisibility)
15679 ModuleScopes.back().OuterVisibleModules = std::move(VisibleModules);
15681 VisibleModules.setVisible(Mod, DirectiveLoc);
15684 void Sema::ActOnModuleEnd(SourceLocation EofLoc, Module *Mod) {
15685 if (getLangOpts().ModulesLocalVisibility) {
15686 VisibleModules = std::move(ModuleScopes.back().OuterVisibleModules);
15687 // Leaving a module hides namespace names, so our visible namespace cache
15688 // is now out of date.
15689 VisibleNamespaceCache.clear();
15692 assert(!ModuleScopes.empty() && ModuleScopes.back().Module == Mod &&
15693 "left the wrong module scope");
15694 ModuleScopes.pop_back();
15696 // We got to the end of processing a #include of a local module. Create an
15697 // ImportDecl as we would for an imported module.
15698 FileID File = getSourceManager().getFileID(EofLoc);
15699 assert(File != getSourceManager().getMainFileID() &&
15700 "end of submodule in main source file");
15701 SourceLocation DirectiveLoc = getSourceManager().getIncludeLoc(File);
15702 BuildModuleInclude(DirectiveLoc, Mod);
15705 void Sema::createImplicitModuleImportForErrorRecovery(SourceLocation Loc,
15707 // Bail if we're not allowed to implicitly import a module here.
15708 if (isSFINAEContext() || !getLangOpts().ModulesErrorRecovery)
15711 // Create the implicit import declaration.
15712 TranslationUnitDecl *TU = getASTContext().getTranslationUnitDecl();
15713 ImportDecl *ImportD = ImportDecl::CreateImplicit(getASTContext(), TU,
15715 TU->addDecl(ImportD);
15716 Consumer.HandleImplicitImportDecl(ImportD);
15718 // Make the module visible.
15719 getModuleLoader().makeModuleVisible(Mod, Module::AllVisible, Loc);
15720 VisibleModules.setVisible(Mod, Loc);
15723 /// We have parsed the start of an export declaration, including the '{'
15725 Decl *Sema::ActOnStartExportDecl(Scope *S, SourceLocation ExportLoc,
15726 SourceLocation LBraceLoc) {
15727 ExportDecl *D = ExportDecl::Create(Context, CurContext, ExportLoc);
15729 // C++ Modules TS draft:
15730 // An export-declaration [...] shall not contain more than one
15733 // The intent here is that an export-declaration cannot appear within another
15734 // export-declaration.
15735 if (D->isExported())
15736 Diag(ExportLoc, diag::err_export_within_export);
15738 CurContext->addDecl(D);
15739 PushDeclContext(S, D);
15743 /// Complete the definition of an export declaration.
15744 Decl *Sema::ActOnFinishExportDecl(Scope *S, Decl *D, SourceLocation RBraceLoc) {
15745 auto *ED = cast<ExportDecl>(D);
15746 if (RBraceLoc.isValid())
15747 ED->setRBraceLoc(RBraceLoc);
15749 // FIXME: Diagnose export of internal-linkage declaration (including
15750 // anonymous namespace).
15756 void Sema::ActOnPragmaRedefineExtname(IdentifierInfo* Name,
15757 IdentifierInfo* AliasName,
15758 SourceLocation PragmaLoc,
15759 SourceLocation NameLoc,
15760 SourceLocation AliasNameLoc) {
15761 NamedDecl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc,
15762 LookupOrdinaryName);
15763 AsmLabelAttr *Attr =
15764 AsmLabelAttr::CreateImplicit(Context, AliasName->getName(), AliasNameLoc);
15766 // If a declaration that:
15767 // 1) declares a function or a variable
15768 // 2) has external linkage
15769 // already exists, add a label attribute to it.
15770 if (PrevDecl && (isa<FunctionDecl>(PrevDecl) || isa<VarDecl>(PrevDecl))) {
15771 if (isDeclExternC(PrevDecl))
15772 PrevDecl->addAttr(Attr);
15774 Diag(PrevDecl->getLocation(), diag::warn_redefine_extname_not_applied)
15775 << /*Variable*/(isa<FunctionDecl>(PrevDecl) ? 0 : 1) << PrevDecl;
15776 // Otherwise, add a label atttibute to ExtnameUndeclaredIdentifiers.
15778 (void)ExtnameUndeclaredIdentifiers.insert(std::make_pair(Name, Attr));
15781 void Sema::ActOnPragmaWeakID(IdentifierInfo* Name,
15782 SourceLocation PragmaLoc,
15783 SourceLocation NameLoc) {
15784 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName);
15787 PrevDecl->addAttr(WeakAttr::CreateImplicit(Context, PragmaLoc));
15789 (void)WeakUndeclaredIdentifiers.insert(
15790 std::pair<IdentifierInfo*,WeakInfo>
15791 (Name, WeakInfo((IdentifierInfo*)nullptr, NameLoc)));
15795 void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name,
15796 IdentifierInfo* AliasName,
15797 SourceLocation PragmaLoc,
15798 SourceLocation NameLoc,
15799 SourceLocation AliasNameLoc) {
15800 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc,
15801 LookupOrdinaryName);
15802 WeakInfo W = WeakInfo(Name, NameLoc);
15804 if (PrevDecl && (isa<FunctionDecl>(PrevDecl) || isa<VarDecl>(PrevDecl))) {
15805 if (!PrevDecl->hasAttr<AliasAttr>())
15806 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl))
15807 DeclApplyPragmaWeak(TUScope, ND, W);
15809 (void)WeakUndeclaredIdentifiers.insert(
15810 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W));
15814 Decl *Sema::getObjCDeclContext() const {
15815 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext));