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 "clang/Sema/SemaInternal.h"
15 #include "clang/Sema/Initialization.h"
16 #include "clang/Sema/Lookup.h"
17 #include "clang/Sema/CXXFieldCollector.h"
18 #include "clang/Sema/Scope.h"
19 #include "clang/Sema/ScopeInfo.h"
20 #include "clang/AST/APValue.h"
21 #include "clang/AST/ASTConsumer.h"
22 #include "clang/AST/ASTContext.h"
23 #include "clang/AST/CXXInheritance.h"
24 #include "clang/AST/DeclCXX.h"
25 #include "clang/AST/DeclObjC.h"
26 #include "clang/AST/DeclTemplate.h"
27 #include "clang/AST/ExprCXX.h"
28 #include "clang/AST/StmtCXX.h"
29 #include "clang/Sema/DeclSpec.h"
30 #include "clang/Sema/ParsedTemplate.h"
31 #include "clang/Parse/ParseDiagnostic.h"
32 #include "clang/Basic/PartialDiagnostic.h"
33 #include "clang/Basic/SourceManager.h"
34 #include "clang/Basic/TargetInfo.h"
35 // FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's)
36 #include "clang/Lex/Preprocessor.h"
37 #include "clang/Lex/HeaderSearch.h"
38 #include "llvm/ADT/Triple.h"
42 using namespace clang;
45 Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr) {
46 return DeclGroupPtrTy::make(DeclGroupRef(Ptr));
49 /// \brief If the identifier refers to a type name within this scope,
50 /// return the declaration of that type.
52 /// This routine performs ordinary name lookup of the identifier II
53 /// within the given scope, with optional C++ scope specifier SS, to
54 /// determine whether the name refers to a type. If so, returns an
55 /// opaque pointer (actually a QualType) corresponding to that
56 /// type. Otherwise, returns NULL.
58 /// If name lookup results in an ambiguity, this routine will complain
59 /// and then return NULL.
60 ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc,
61 Scope *S, CXXScopeSpec *SS,
63 ParsedType ObjectTypePtr) {
64 // Determine where we will perform name lookup.
65 DeclContext *LookupCtx = 0;
67 QualType ObjectType = ObjectTypePtr.get();
68 if (ObjectType->isRecordType())
69 LookupCtx = computeDeclContext(ObjectType);
70 } else if (SS && SS->isNotEmpty()) {
71 LookupCtx = computeDeclContext(*SS, false);
74 if (isDependentScopeSpecifier(*SS)) {
76 // A qualified-id that refers to a type and in which the
77 // nested-name-specifier depends on a template-parameter (14.6.2)
78 // shall be prefixed by the keyword typename to indicate that the
79 // qualified-id denotes a type, forming an
80 // elaborated-type-specifier (7.1.5.3).
82 // We therefore do not perform any name lookup if the result would
83 // refer to a member of an unknown specialization.
87 // We know from the grammar that this name refers to a type,
88 // so build a dependent node to describe the type.
90 CheckTypenameType(ETK_None, SS->getScopeRep(), II,
91 SourceLocation(), SS->getRange(), NameLoc);
92 return ParsedType::make(T);
98 if (!LookupCtx->isDependentContext() &&
99 RequireCompleteDeclContext(*SS, LookupCtx))
103 // FIXME: LookupNestedNameSpecifierName isn't the right kind of
104 // lookup for class-names.
105 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName :
107 LookupResult Result(*this, &II, NameLoc, Kind);
109 // Perform "qualified" name lookup into the declaration context we
110 // computed, which is either the type of the base of a member access
111 // expression or the declaration context associated with a prior
112 // nested-name-specifier.
113 LookupQualifiedName(Result, LookupCtx);
115 if (ObjectTypePtr && Result.empty()) {
116 // C++ [basic.lookup.classref]p3:
117 // If the unqualified-id is ~type-name, the type-name is looked up
118 // in the context of the entire postfix-expression. If the type T of
119 // the object expression is of a class type C, the type-name is also
120 // looked up in the scope of class C. At least one of the lookups shall
121 // find a name that refers to (possibly cv-qualified) T.
122 LookupName(Result, S);
125 // Perform unqualified name lookup.
126 LookupName(Result, S);
129 NamedDecl *IIDecl = 0;
130 switch (Result.getResultKind()) {
131 case LookupResult::NotFound:
132 case LookupResult::NotFoundInCurrentInstantiation:
133 case LookupResult::FoundOverloaded:
134 case LookupResult::FoundUnresolvedValue:
135 Result.suppressDiagnostics();
138 case LookupResult::Ambiguous:
139 // Recover from type-hiding ambiguities by hiding the type. We'll
140 // do the lookup again when looking for an object, and we can
141 // diagnose the error then. If we don't do this, then the error
142 // about hiding the type will be immediately followed by an error
143 // that only makes sense if the identifier was treated like a type.
144 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) {
145 Result.suppressDiagnostics();
149 // Look to see if we have a type anywhere in the list of results.
150 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end();
151 Res != ResEnd; ++Res) {
152 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) {
154 (*Res)->getLocation().getRawEncoding() <
155 IIDecl->getLocation().getRawEncoding())
161 // None of the entities we found is a type, so there is no way
162 // to even assume that the result is a type. In this case, don't
163 // complain about the ambiguity. The parser will either try to
164 // perform this lookup again (e.g., as an object name), which
165 // will produce the ambiguity, or will complain that it expected
167 Result.suppressDiagnostics();
171 // We found a type within the ambiguous lookup; diagnose the
172 // ambiguity and then return that type. This might be the right
173 // answer, or it might not be, but it suppresses any attempt to
174 // perform the name lookup again.
177 case LookupResult::Found:
178 IIDecl = Result.getFoundDecl();
182 assert(IIDecl && "Didn't find decl");
185 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) {
186 DiagnoseUseOfDecl(IIDecl, NameLoc);
189 T = Context.getTypeDeclType(TD);
192 T = getElaboratedType(ETK_None, *SS, T);
194 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) {
195 T = Context.getObjCInterfaceType(IDecl);
197 // If it's not plausibly a type, suppress diagnostics.
198 Result.suppressDiagnostics();
202 return ParsedType::make(T);
205 /// isTagName() - This method is called *for error recovery purposes only*
206 /// to determine if the specified name is a valid tag name ("struct foo"). If
207 /// so, this returns the TST for the tag corresponding to it (TST_enum,
208 /// TST_union, TST_struct, TST_class). This is used to diagnose cases in C
209 /// where the user forgot to specify the tag.
210 DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) {
211 // Do a tag name lookup in this scope.
212 LookupResult R(*this, &II, SourceLocation(), LookupTagName);
213 LookupName(R, S, false);
214 R.suppressDiagnostics();
215 if (R.getResultKind() == LookupResult::Found)
216 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) {
217 switch (TD->getTagKind()) {
218 default: return DeclSpec::TST_unspecified;
219 case TTK_Struct: return DeclSpec::TST_struct;
220 case TTK_Union: return DeclSpec::TST_union;
221 case TTK_Class: return DeclSpec::TST_class;
222 case TTK_Enum: return DeclSpec::TST_enum;
226 return DeclSpec::TST_unspecified;
229 bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II,
230 SourceLocation IILoc,
233 ParsedType &SuggestedType) {
234 // We don't have anything to suggest (yet).
235 SuggestedType = ParsedType();
237 // There may have been a typo in the name of the type. Look up typo
238 // results, in case we have something that we can suggest.
239 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName,
240 NotForRedeclaration);
242 if (DeclarationName Corrected = CorrectTypo(Lookup, S, SS, 0, 0, CTC_Type)) {
243 if (NamedDecl *Result = Lookup.getAsSingle<NamedDecl>()) {
244 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) &&
245 !Result->isInvalidDecl()) {
246 // We found a similarly-named type or interface; suggest that.
247 if (!SS || !SS->isSet())
248 Diag(IILoc, diag::err_unknown_typename_suggest)
249 << &II << Lookup.getLookupName()
250 << FixItHint::CreateReplacement(SourceRange(IILoc),
251 Result->getNameAsString());
252 else if (DeclContext *DC = computeDeclContext(*SS, false))
253 Diag(IILoc, diag::err_unknown_nested_typename_suggest)
254 << &II << DC << Lookup.getLookupName() << SS->getRange()
255 << FixItHint::CreateReplacement(SourceRange(IILoc),
256 Result->getNameAsString());
258 llvm_unreachable("could not have corrected a typo here");
260 Diag(Result->getLocation(), diag::note_previous_decl)
261 << Result->getDeclName();
263 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS);
266 } else if (Lookup.empty()) {
267 // We corrected to a keyword.
268 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it.
269 Diag(IILoc, diag::err_unknown_typename_suggest)
275 if (getLangOptions().CPlusPlus) {
276 // See if II is a class template that the user forgot to pass arguments to.
278 Name.setIdentifier(&II, IILoc);
279 CXXScopeSpec EmptySS;
280 TemplateTy TemplateResult;
281 bool MemberOfUnknownSpecialization;
282 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false,
283 Name, ParsedType(), true, TemplateResult,
284 MemberOfUnknownSpecialization) == TNK_Type_template) {
285 TemplateName TplName = TemplateResult.getAsVal<TemplateName>();
286 Diag(IILoc, diag::err_template_missing_args) << TplName;
287 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) {
288 Diag(TplDecl->getLocation(), diag::note_template_decl_here)
289 << TplDecl->getTemplateParameters()->getSourceRange();
295 // FIXME: Should we move the logic that tries to recover from a missing tag
296 // (struct, union, enum) from Parser::ParseImplicitInt here, instead?
298 if (!SS || (!SS->isSet() && !SS->isInvalid()))
299 Diag(IILoc, diag::err_unknown_typename) << &II;
300 else if (DeclContext *DC = computeDeclContext(*SS, false))
301 Diag(IILoc, diag::err_typename_nested_not_found)
302 << &II << DC << SS->getRange();
303 else if (isDependentScopeSpecifier(*SS)) {
304 Diag(SS->getRange().getBegin(), diag::err_typename_missing)
305 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName()
306 << SourceRange(SS->getRange().getBegin(), IILoc)
307 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename ");
308 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get();
310 assert(SS && SS->isInvalid() &&
311 "Invalid scope specifier has already been diagnosed");
317 // Determines the context to return to after temporarily entering a
318 // context. This depends in an unnecessarily complicated way on the
319 // exact ordering of callbacks from the parser.
320 DeclContext *Sema::getContainingDC(DeclContext *DC) {
322 // Functions defined inline within classes aren't parsed until we've
323 // finished parsing the top-level class, so the top-level class is
324 // the context we'll need to return to.
325 if (isa<FunctionDecl>(DC)) {
326 DC = DC->getLexicalParent();
328 // A function not defined within a class will always return to its
330 if (!isa<CXXRecordDecl>(DC))
333 // A C++ inline method/friend is parsed *after* the topmost class
334 // it was declared in is fully parsed ("complete"); the topmost
335 // class is the context we need to return to.
336 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent()))
339 // Return the declaration context of the topmost class the inline method is
344 // ObjCMethodDecls are parsed (for some reason) outside the context
346 if (isa<ObjCMethodDecl>(DC))
347 return DC->getLexicalParent()->getLexicalParent();
349 return DC->getLexicalParent();
352 void Sema::PushDeclContext(Scope *S, DeclContext *DC) {
353 assert(getContainingDC(DC) == CurContext &&
354 "The next DeclContext should be lexically contained in the current one.");
359 void Sema::PopDeclContext() {
360 assert(CurContext && "DeclContext imbalance!");
362 CurContext = getContainingDC(CurContext);
363 assert(CurContext && "Popped translation unit!");
366 /// EnterDeclaratorContext - Used when we must lookup names in the context
367 /// of a declarator's nested name specifier.
369 void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) {
370 // C++0x [basic.lookup.unqual]p13:
371 // A name used in the definition of a static data member of class
372 // X (after the qualified-id of the static member) is looked up as
373 // if the name was used in a member function of X.
374 // C++0x [basic.lookup.unqual]p14:
375 // If a variable member of a namespace is defined outside of the
376 // scope of its namespace then any name used in the definition of
377 // the variable member (after the declarator-id) is looked up as
378 // if the definition of the variable member occurred in its
380 // Both of these imply that we should push a scope whose context
381 // is the semantic context of the declaration. We can't use
382 // PushDeclContext here because that context is not necessarily
383 // lexically contained in the current context. Fortunately,
384 // the containing scope should have the appropriate information.
386 assert(!S->getEntity() && "scope already has entity");
389 Scope *Ancestor = S->getParent();
390 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
391 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch");
398 void Sema::ExitDeclaratorContext(Scope *S) {
399 assert(S->getEntity() == CurContext && "Context imbalance!");
401 // Switch back to the lexical context. The safety of this is
402 // enforced by an assert in EnterDeclaratorContext.
403 Scope *Ancestor = S->getParent();
404 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
405 CurContext = (DeclContext*) Ancestor->getEntity();
407 // We don't need to do anything with the scope, which is going to
411 /// \brief Determine whether we allow overloading of the function
412 /// PrevDecl with another declaration.
414 /// This routine determines whether overloading is possible, not
415 /// whether some new function is actually an overload. It will return
416 /// true in C++ (where we can always provide overloads) or, as an
417 /// extension, in C when the previous function is already an
418 /// overloaded function declaration or has the "overloadable"
420 static bool AllowOverloadingOfFunction(LookupResult &Previous,
421 ASTContext &Context) {
422 if (Context.getLangOptions().CPlusPlus)
425 if (Previous.getResultKind() == LookupResult::FoundOverloaded)
428 return (Previous.getResultKind() == LookupResult::Found
429 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>());
432 /// Add this decl to the scope shadowed decl chains.
433 void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) {
434 // Move up the scope chain until we find the nearest enclosing
435 // non-transparent context. The declaration will be introduced into this
437 while (S->getEntity() &&
438 ((DeclContext *)S->getEntity())->isTransparentContext())
441 // Add scoped declarations into their context, so that they can be
442 // found later. Declarations without a context won't be inserted
445 CurContext->addDecl(D);
447 // Out-of-line definitions shouldn't be pushed into scope in C++.
448 // Out-of-line variable and function definitions shouldn't even in C.
449 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) &&
453 // Template instantiations should also not be pushed into scope.
454 if (isa<FunctionDecl>(D) &&
455 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization())
458 // If this replaces anything in the current scope,
459 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()),
460 IEnd = IdResolver.end();
461 for (; I != IEnd; ++I) {
462 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) {
464 IdResolver.RemoveDecl(*I);
466 // Should only need to replace one decl.
472 IdResolver.AddDecl(D);
475 bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) {
476 return IdResolver.isDeclInScope(D, Ctx, Context, S);
479 Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) {
480 DeclContext *TargetDC = DC->getPrimaryContext();
482 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity())
483 if (ScopeDC->getPrimaryContext() == TargetDC)
485 } while ((S = S->getParent()));
490 static bool isOutOfScopePreviousDeclaration(NamedDecl *,
494 /// Filters out lookup results that don't fall within the given scope
495 /// as determined by isDeclInScope.
496 static void FilterLookupForScope(Sema &SemaRef, LookupResult &R,
497 DeclContext *Ctx, Scope *S,
498 bool ConsiderLinkage) {
499 LookupResult::Filter F = R.makeFilter();
500 while (F.hasNext()) {
501 NamedDecl *D = F.next();
503 if (SemaRef.isDeclInScope(D, Ctx, S))
506 if (ConsiderLinkage &&
507 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context))
516 static bool isUsingDecl(NamedDecl *D) {
517 return isa<UsingShadowDecl>(D) ||
518 isa<UnresolvedUsingTypenameDecl>(D) ||
519 isa<UnresolvedUsingValueDecl>(D);
522 /// Removes using shadow declarations from the lookup results.
523 static void RemoveUsingDecls(LookupResult &R) {
524 LookupResult::Filter F = R.makeFilter();
526 if (isUsingDecl(F.next()))
532 /// \brief Check for this common pattern:
535 /// S(const S&); // DO NOT IMPLEMENT
536 /// void operator=(const S&); // DO NOT IMPLEMENT
539 static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) {
540 // FIXME: Should check for private access too but access is set after we get
542 if (D->isThisDeclarationADefinition())
545 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D))
546 return CD->isCopyConstructor();
547 return D->isCopyAssignment();
550 bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const {
553 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>())
556 // Ignore class templates.
557 if (D->getDeclContext()->isDependentContext())
560 // We warn for unused decls internal to the translation unit.
561 if (D->getLinkage() == ExternalLinkage)
564 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
565 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
568 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
569 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD))
572 // 'static inline' functions are used in headers; don't warn.
573 if (FD->getStorageClass() == SC_Static &&
574 FD->isInlineSpecified())
578 if (FD->isThisDeclarationADefinition())
579 return !Context.DeclMustBeEmitted(FD);
583 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
584 if (VD->isStaticDataMember() &&
585 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
588 if ( VD->isFileVarDecl() &&
589 !VD->getType().isConstant(Context))
590 return !Context.DeclMustBeEmitted(VD);
596 void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) {
600 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
601 const FunctionDecl *First = FD->getFirstDeclaration();
602 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First))
603 return; // First should already be in the vector.
606 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
607 const VarDecl *First = VD->getFirstDeclaration();
608 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First))
609 return; // First should already be in the vector.
612 if (ShouldWarnIfUnusedFileScopedDecl(D))
613 UnusedFileScopedDecls.push_back(D);
616 static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) {
617 if (D->isInvalidDecl())
620 if (D->isUsed() || D->hasAttr<UnusedAttr>())
623 // White-list anything that isn't a local variable.
624 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) ||
625 !D->getDeclContext()->isFunctionOrMethod())
628 // Types of valid local variables should be complete, so this should succeed.
629 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) {
631 // White-list anything with an __attribute__((unused)) type.
632 QualType Ty = VD->getType();
634 // Only look at the outermost level of typedef.
635 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) {
636 if (TT->getDecl()->hasAttr<UnusedAttr>())
640 // If we failed to complete the type for some reason, or if the type is
641 // dependent, don't diagnose the variable.
642 if (Ty->isIncompleteType() || Ty->isDependentType())
645 if (const TagType *TT = Ty->getAs<TagType>()) {
646 const TagDecl *Tag = TT->getDecl();
647 if (Tag->hasAttr<UnusedAttr>())
650 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) {
651 // FIXME: Checking for the presence of a user-declared constructor
652 // isn't completely accurate; we'd prefer to check that the initializer
653 // has no side effects.
654 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor())
659 // TODO: __attribute__((unused)) templates?
665 void Sema::DiagnoseUnusedDecl(const NamedDecl *D) {
666 if (!ShouldDiagnoseUnusedDecl(D))
669 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable())
670 Diag(D->getLocation(), diag::warn_unused_exception_param)
673 Diag(D->getLocation(), diag::warn_unused_variable)
677 void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) {
678 if (S->decl_empty()) return;
679 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) &&
680 "Scope shouldn't contain decls!");
682 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end();
685 assert(TmpD && "This decl didn't get pushed??");
687 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?");
688 NamedDecl *D = cast<NamedDecl>(TmpD);
690 if (!D->getDeclName()) continue;
692 // Diagnose unused variables in this scope.
693 if (S->getNumErrorsAtStart() == getDiagnostics().getNumErrors())
694 DiagnoseUnusedDecl(D);
696 // Remove this name from our lexical scope.
697 IdResolver.RemoveDecl(D);
701 /// \brief Look for an Objective-C class in the translation unit.
703 /// \param Id The name of the Objective-C class we're looking for. If
704 /// typo-correction fixes this name, the Id will be updated
705 /// to the fixed name.
707 /// \param IdLoc The location of the name in the translation unit.
709 /// \param TypoCorrection If true, this routine will attempt typo correction
710 /// if there is no class with the given name.
712 /// \returns The declaration of the named Objective-C class, or NULL if the
713 /// class could not be found.
714 ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id,
715 SourceLocation IdLoc,
716 bool TypoCorrection) {
717 // The third "scope" argument is 0 since we aren't enabling lazy built-in
718 // creation from this context.
719 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName);
721 if (!IDecl && TypoCorrection) {
722 // Perform typo correction at the given location, but only if we
723 // find an Objective-C class name.
724 LookupResult R(*this, Id, IdLoc, LookupOrdinaryName);
725 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) &&
726 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) {
727 Diag(IdLoc, diag::err_undef_interface_suggest)
728 << Id << IDecl->getDeclName()
729 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString());
730 Diag(IDecl->getLocation(), diag::note_previous_decl)
731 << IDecl->getDeclName();
733 Id = IDecl->getIdentifier();
737 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl);
740 /// getNonFieldDeclScope - Retrieves the innermost scope, starting
741 /// from S, where a non-field would be declared. This routine copes
742 /// with the difference between C and C++ scoping rules in structs and
743 /// unions. For example, the following code is well-formed in C but
744 /// ill-formed in C++:
755 /// For the declaration of BAR, this routine will return a different
756 /// scope. The scope S will be the scope of the unnamed enumeration
757 /// within S6. In C++, this routine will return the scope associated
758 /// with S6, because the enumeration's scope is a transparent
759 /// context but structures can contain non-field names. In C, this
760 /// routine will return the translation unit scope, since the
761 /// enumeration's scope is a transparent context and structures cannot
762 /// contain non-field names.
763 Scope *Sema::getNonFieldDeclScope(Scope *S) {
764 while (((S->getFlags() & Scope::DeclScope) == 0) ||
766 ((DeclContext *)S->getEntity())->isTransparentContext()) ||
767 (S->isClassScope() && !getLangOptions().CPlusPlus))
772 void Sema::InitBuiltinVaListType() {
773 if (!Context.getBuiltinVaListType().isNull())
776 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list");
777 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, SourceLocation(),
778 LookupOrdinaryName, ForRedeclaration);
779 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl);
780 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef));
783 /// LazilyCreateBuiltin - The specified Builtin-ID was first used at
784 /// file scope. lazily create a decl for it. ForRedeclaration is true
785 /// if we're creating this built-in in anticipation of redeclaring the
787 NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid,
788 Scope *S, bool ForRedeclaration,
789 SourceLocation Loc) {
790 Builtin::ID BID = (Builtin::ID)bid;
792 if (Context.BuiltinInfo.hasVAListUse(BID))
793 InitBuiltinVaListType();
795 ASTContext::GetBuiltinTypeError Error;
796 QualType R = Context.GetBuiltinType(BID, Error);
798 case ASTContext::GE_None:
802 case ASTContext::GE_Missing_stdio:
803 if (ForRedeclaration)
804 Diag(Loc, diag::err_implicit_decl_requires_stdio)
805 << Context.BuiltinInfo.GetName(BID);
808 case ASTContext::GE_Missing_setjmp:
809 if (ForRedeclaration)
810 Diag(Loc, diag::err_implicit_decl_requires_setjmp)
811 << Context.BuiltinInfo.GetName(BID);
815 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) {
816 Diag(Loc, diag::ext_implicit_lib_function_decl)
817 << Context.BuiltinInfo.GetName(BID)
819 if (Context.BuiltinInfo.getHeaderName(BID) &&
820 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl)
821 != Diagnostic::Ignored)
822 Diag(Loc, diag::note_please_include_header)
823 << Context.BuiltinInfo.getHeaderName(BID)
824 << Context.BuiltinInfo.GetName(BID);
827 FunctionDecl *New = FunctionDecl::Create(Context,
828 Context.getTranslationUnitDecl(),
829 Loc, II, R, /*TInfo=*/0,
832 /*hasPrototype=*/true);
835 // Create Decl objects for each parameter, adding them to the
837 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) {
838 llvm::SmallVector<ParmVarDecl*, 16> Params;
839 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i)
840 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0,
841 FT->getArgType(i), /*TInfo=*/0,
842 SC_None, SC_None, 0));
843 New->setParams(Params.data(), Params.size());
846 AddKnownFunctionAttributes(New);
848 // TUScope is the translation-unit scope to insert this function into.
849 // FIXME: This is hideous. We need to teach PushOnScopeChains to
850 // relate Scopes to DeclContexts, and probably eliminate CurContext
851 // entirely, but we're not there yet.
852 DeclContext *SavedContext = CurContext;
853 CurContext = Context.getTranslationUnitDecl();
854 PushOnScopeChains(New, TUScope);
855 CurContext = SavedContext;
859 /// MergeTypeDefDecl - We just parsed a typedef 'New' which has the
860 /// same name and scope as a previous declaration 'Old'. Figure out
861 /// how to resolve this situation, merging decls or emitting
862 /// diagnostics as appropriate. If there was an error, set New to be invalid.
864 void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) {
865 // If the new decl is known invalid already, don't bother doing any
867 if (New->isInvalidDecl()) return;
869 // Allow multiple definitions for ObjC built-in typedefs.
870 // FIXME: Verify the underlying types are equivalent!
871 if (getLangOptions().ObjC1) {
872 const IdentifierInfo *TypeID = New->getIdentifier();
873 switch (TypeID->getLength()) {
876 if (!TypeID->isStr("id"))
878 Context.ObjCIdRedefinitionType = New->getUnderlyingType();
879 // Install the built-in type for 'id', ignoring the current definition.
880 New->setTypeForDecl(Context.getObjCIdType().getTypePtr());
883 if (!TypeID->isStr("Class"))
885 Context.ObjCClassRedefinitionType = New->getUnderlyingType();
886 // Install the built-in type for 'Class', ignoring the current definition.
887 New->setTypeForDecl(Context.getObjCClassType().getTypePtr());
890 if (!TypeID->isStr("SEL"))
892 Context.ObjCSelRedefinitionType = New->getUnderlyingType();
893 // Install the built-in type for 'SEL', ignoring the current definition.
894 New->setTypeForDecl(Context.getObjCSelType().getTypePtr());
897 if (!TypeID->isStr("Protocol"))
899 Context.setObjCProtoType(New->getUnderlyingType());
902 // Fall through - the typedef name was not a builtin type.
905 // Verify the old decl was also a type.
906 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>();
908 Diag(New->getLocation(), diag::err_redefinition_different_kind)
909 << New->getDeclName();
911 NamedDecl *OldD = OldDecls.getRepresentativeDecl();
912 if (OldD->getLocation().isValid())
913 Diag(OldD->getLocation(), diag::note_previous_definition);
915 return New->setInvalidDecl();
918 // If the old declaration is invalid, just give up here.
919 if (Old->isInvalidDecl())
920 return New->setInvalidDecl();
922 // Determine the "old" type we'll use for checking and diagnostics.
924 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old))
925 OldType = OldTypedef->getUnderlyingType();
927 OldType = Context.getTypeDeclType(Old);
929 // If the typedef types are not identical, reject them in all languages and
930 // with any extensions enabled.
932 if (OldType != New->getUnderlyingType() &&
933 Context.getCanonicalType(OldType) !=
934 Context.getCanonicalType(New->getUnderlyingType())) {
935 Diag(New->getLocation(), diag::err_redefinition_different_typedef)
936 << New->getUnderlyingType() << OldType;
937 if (Old->getLocation().isValid())
938 Diag(Old->getLocation(), diag::note_previous_definition);
939 return New->setInvalidDecl();
942 // The types match. Link up the redeclaration chain if the old
943 // declaration was a typedef.
944 // FIXME: this is a potential source of wierdness if the type
945 // spellings don't match exactly.
946 if (isa<TypedefDecl>(Old))
947 New->setPreviousDeclaration(cast<TypedefDecl>(Old));
949 if (getLangOptions().Microsoft)
952 if (getLangOptions().CPlusPlus) {
953 // C++ [dcl.typedef]p2:
954 // In a given non-class scope, a typedef specifier can be used to
955 // redefine the name of any type declared in that scope to refer
956 // to the type to which it already refers.
957 if (!isa<CXXRecordDecl>(CurContext))
960 // C++0x [dcl.typedef]p4:
961 // In a given class scope, a typedef specifier can be used to redefine
962 // any class-name declared in that scope that is not also a typedef-name
963 // to refer to the type to which it already refers.
965 // This wording came in via DR424, which was a correction to the
966 // wording in DR56, which accidentally banned code like:
969 // typedef struct A { } A;
972 // in the C++03 standard. We implement the C++0x semantics, which
973 // allow the above but disallow
980 // since that was the intent of DR56.
981 if (!isa<TypedefDecl >(Old))
984 Diag(New->getLocation(), diag::err_redefinition)
985 << New->getDeclName();
986 Diag(Old->getLocation(), diag::note_previous_definition);
987 return New->setInvalidDecl();
990 // If we have a redefinition of a typedef in C, emit a warning. This warning
991 // is normally mapped to an error, but can be controlled with
992 // -Wtypedef-redefinition. If either the original or the redefinition is
993 // in a system header, don't emit this for compatibility with GCC.
994 if (getDiagnostics().getSuppressSystemWarnings() &&
995 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) ||
996 Context.getSourceManager().isInSystemHeader(New->getLocation())))
999 Diag(New->getLocation(), diag::warn_redefinition_of_typedef)
1000 << New->getDeclName();
1001 Diag(Old->getLocation(), diag::note_previous_definition);
1005 /// DeclhasAttr - returns true if decl Declaration already has the target
1008 DeclHasAttr(const Decl *D, const Attr *A) {
1009 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A);
1010 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i)
1011 if ((*i)->getKind() == A->getKind()) {
1012 // FIXME: Don't hardcode this check
1013 if (OA && isa<OwnershipAttr>(*i))
1014 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind();
1021 /// MergeDeclAttributes - append attributes from the Old decl to the New one.
1022 static void MergeDeclAttributes(Decl *New, Decl *Old, ASTContext &C) {
1023 if (!Old->hasAttrs())
1025 // Ensure that any moving of objects within the allocated map is done before
1027 if (!New->hasAttrs())
1028 New->setAttrs(AttrVec());
1029 for (Decl::attr_iterator i = Old->attr_begin(), e = Old->attr_end(); i != e;
1031 // FIXME: Make this more general than just checking for Overloadable.
1032 if (!DeclHasAttr(New, *i) && (*i)->getKind() != attr::Overloadable) {
1033 Attr *NewAttr = (*i)->clone(C);
1034 NewAttr->setInherited(true);
1035 New->addAttr(NewAttr);
1042 /// Used in MergeFunctionDecl to keep track of function parameters in
1044 struct GNUCompatibleParamWarning {
1045 ParmVarDecl *OldParm;
1046 ParmVarDecl *NewParm;
1047 QualType PromotedType;
1052 /// getSpecialMember - get the special member enum for a method.
1053 Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) {
1054 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) {
1055 if (Ctor->isCopyConstructor())
1056 return Sema::CXXCopyConstructor;
1058 return Sema::CXXConstructor;
1061 if (isa<CXXDestructorDecl>(MD))
1062 return Sema::CXXDestructor;
1064 assert(MD->isCopyAssignment() && "Must have copy assignment operator");
1065 return Sema::CXXCopyAssignment;
1068 /// canRedefineFunction - checks if a function can be redefined. Currently,
1069 /// only extern inline functions can be redefined, and even then only in
1071 static bool canRedefineFunction(const FunctionDecl *FD,
1072 const LangOptions& LangOpts) {
1073 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus &&
1074 FD->isInlineSpecified() &&
1075 FD->getStorageClass() == SC_Extern);
1078 /// MergeFunctionDecl - We just parsed a function 'New' from
1079 /// declarator D which has the same name and scope as a previous
1080 /// declaration 'Old'. Figure out how to resolve this situation,
1081 /// merging decls or emitting diagnostics as appropriate.
1083 /// In C++, New and Old must be declarations that are not
1084 /// overloaded. Use IsOverload to determine whether New and Old are
1085 /// overloaded, and to select the Old declaration that New should be
1088 /// Returns true if there was an error, false otherwise.
1089 bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) {
1090 // Verify the old decl was also a function.
1091 FunctionDecl *Old = 0;
1092 if (FunctionTemplateDecl *OldFunctionTemplate
1093 = dyn_cast<FunctionTemplateDecl>(OldD))
1094 Old = OldFunctionTemplate->getTemplatedDecl();
1096 Old = dyn_cast<FunctionDecl>(OldD);
1098 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) {
1099 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse);
1100 Diag(Shadow->getTargetDecl()->getLocation(),
1101 diag::note_using_decl_target);
1102 Diag(Shadow->getUsingDecl()->getLocation(),
1103 diag::note_using_decl) << 0;
1107 Diag(New->getLocation(), diag::err_redefinition_different_kind)
1108 << New->getDeclName();
1109 Diag(OldD->getLocation(), diag::note_previous_definition);
1113 // Determine whether the previous declaration was a definition,
1114 // implicit declaration, or a declaration.
1115 diag::kind PrevDiag;
1116 if (Old->isThisDeclarationADefinition())
1117 PrevDiag = diag::note_previous_definition;
1118 else if (Old->isImplicit())
1119 PrevDiag = diag::note_previous_implicit_declaration;
1121 PrevDiag = diag::note_previous_declaration;
1123 QualType OldQType = Context.getCanonicalType(Old->getType());
1124 QualType NewQType = Context.getCanonicalType(New->getType());
1126 // Don't complain about this if we're in GNU89 mode and the old function
1127 // is an extern inline function.
1128 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) &&
1129 New->getStorageClass() == SC_Static &&
1130 Old->getStorageClass() != SC_Static &&
1131 !canRedefineFunction(Old, getLangOptions())) {
1132 Diag(New->getLocation(), diag::err_static_non_static)
1134 Diag(Old->getLocation(), PrevDiag);
1138 // If a function is first declared with a calling convention, but is
1139 // later declared or defined without one, the second decl assumes the
1140 // calling convention of the first.
1142 // For the new decl, we have to look at the NON-canonical type to tell the
1143 // difference between a function that really doesn't have a calling
1144 // convention and one that is declared cdecl. That's because in
1145 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away
1146 // because it is the default calling convention.
1148 // Note also that we DO NOT return at this point, because we still have
1149 // other tests to run.
1150 const FunctionType *OldType = OldQType->getAs<FunctionType>();
1151 const FunctionType *NewType = New->getType()->getAs<FunctionType>();
1152 const FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo();
1153 const FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo();
1154 if (OldTypeInfo.getCC() != CC_Default &&
1155 NewTypeInfo.getCC() == CC_Default) {
1156 NewQType = Context.getCallConvType(NewQType, OldTypeInfo.getCC());
1157 New->setType(NewQType);
1158 NewQType = Context.getCanonicalType(NewQType);
1159 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(),
1160 NewTypeInfo.getCC())) {
1161 // Calling conventions really aren't compatible, so complain.
1162 Diag(New->getLocation(), diag::err_cconv_change)
1163 << FunctionType::getNameForCallConv(NewTypeInfo.getCC())
1164 << (OldTypeInfo.getCC() == CC_Default)
1165 << (OldTypeInfo.getCC() == CC_Default ? "" :
1166 FunctionType::getNameForCallConv(OldTypeInfo.getCC()));
1167 Diag(Old->getLocation(), diag::note_previous_declaration);
1171 // FIXME: diagnose the other way around?
1172 if (OldType->getNoReturnAttr() && !NewType->getNoReturnAttr()) {
1173 NewQType = Context.getNoReturnType(NewQType);
1174 New->setType(NewQType);
1175 assert(NewQType.isCanonical());
1178 // Merge regparm attribute.
1179 if (OldType->getRegParmType() != NewType->getRegParmType()) {
1180 if (NewType->getRegParmType()) {
1181 Diag(New->getLocation(), diag::err_regparm_mismatch)
1182 << NewType->getRegParmType()
1183 << OldType->getRegParmType();
1184 Diag(Old->getLocation(), diag::note_previous_declaration);
1188 NewQType = Context.getRegParmType(NewQType, OldType->getRegParmType());
1189 New->setType(NewQType);
1190 assert(NewQType.isCanonical());
1193 if (getLangOptions().CPlusPlus) {
1195 // Certain function declarations cannot be overloaded:
1196 // -- Function declarations that differ only in the return type
1197 // cannot be overloaded.
1198 QualType OldReturnType
1199 = cast<FunctionType>(OldQType.getTypePtr())->getResultType();
1200 QualType NewReturnType
1201 = cast<FunctionType>(NewQType.getTypePtr())->getResultType();
1203 if (OldReturnType != NewReturnType) {
1204 if (NewReturnType->isObjCObjectPointerType()
1205 && OldReturnType->isObjCObjectPointerType())
1206 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType);
1207 if (ResQT.isNull()) {
1208 Diag(New->getLocation(), diag::err_ovl_diff_return_type);
1209 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
1216 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old);
1217 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New);
1218 if (OldMethod && NewMethod) {
1219 // Preserve triviality.
1220 NewMethod->setTrivial(OldMethod->isTrivial());
1222 bool isFriend = NewMethod->getFriendObjectKind();
1224 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) {
1225 // -- Member function declarations with the same name and the
1226 // same parameter types cannot be overloaded if any of them
1227 // is a static member function declaration.
1228 if (OldMethod->isStatic() || NewMethod->isStatic()) {
1229 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member);
1230 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
1234 // C++ [class.mem]p1:
1235 // [...] A member shall not be declared twice in the
1236 // member-specification, except that a nested class or member
1237 // class template can be declared and then later defined.
1239 if (isa<CXXConstructorDecl>(OldMethod))
1240 NewDiag = diag::err_constructor_redeclared;
1241 else if (isa<CXXDestructorDecl>(NewMethod))
1242 NewDiag = diag::err_destructor_redeclared;
1243 else if (isa<CXXConversionDecl>(NewMethod))
1244 NewDiag = diag::err_conv_function_redeclared;
1246 NewDiag = diag::err_member_redeclared;
1248 Diag(New->getLocation(), NewDiag);
1249 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
1251 // Complain if this is an explicit declaration of a special
1252 // member that was initially declared implicitly.
1254 // As an exception, it's okay to befriend such methods in order
1255 // to permit the implicit constructor/destructor/operator calls.
1256 } else if (OldMethod->isImplicit()) {
1258 NewMethod->setImplicit();
1260 Diag(NewMethod->getLocation(),
1261 diag::err_definition_of_implicitly_declared_member)
1262 << New << getSpecialMember(OldMethod);
1269 // All declarations for a function shall agree exactly in both the
1270 // return type and the parameter-type-list.
1271 // attributes should be ignored when comparing.
1272 if (Context.getNoReturnType(OldQType, false) ==
1273 Context.getNoReturnType(NewQType, false))
1274 return MergeCompatibleFunctionDecls(New, Old);
1276 // Fall through for conflicting redeclarations and redefinitions.
1279 // C: Function types need to be compatible, not identical. This handles
1280 // duplicate function decls like "void f(int); void f(enum X);" properly.
1281 if (!getLangOptions().CPlusPlus &&
1282 Context.typesAreCompatible(OldQType, NewQType)) {
1283 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>();
1284 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>();
1285 const FunctionProtoType *OldProto = 0;
1286 if (isa<FunctionNoProtoType>(NewFuncType) &&
1287 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) {
1288 // The old declaration provided a function prototype, but the
1289 // new declaration does not. Merge in the prototype.
1290 assert(!OldProto->hasExceptionSpec() && "Exception spec in C");
1291 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(),
1292 OldProto->arg_type_end());
1293 NewQType = Context.getFunctionType(NewFuncType->getResultType(),
1294 ParamTypes.data(), ParamTypes.size(),
1295 OldProto->isVariadic(),
1296 OldProto->getTypeQuals(),
1298 OldProto->getExtInfo());
1299 New->setType(NewQType);
1300 New->setHasInheritedPrototype();
1302 // Synthesize a parameter for each argument type.
1303 llvm::SmallVector<ParmVarDecl*, 16> Params;
1304 for (FunctionProtoType::arg_type_iterator
1305 ParamType = OldProto->arg_type_begin(),
1306 ParamEnd = OldProto->arg_type_end();
1307 ParamType != ParamEnd; ++ParamType) {
1308 ParmVarDecl *Param = ParmVarDecl::Create(Context, New,
1309 SourceLocation(), 0,
1310 *ParamType, /*TInfo=*/0,
1313 Param->setImplicit();
1314 Params.push_back(Param);
1317 New->setParams(Params.data(), Params.size());
1320 return MergeCompatibleFunctionDecls(New, Old);
1323 // GNU C permits a K&R definition to follow a prototype declaration
1324 // if the declared types of the parameters in the K&R definition
1325 // match the types in the prototype declaration, even when the
1326 // promoted types of the parameters from the K&R definition differ
1327 // from the types in the prototype. GCC then keeps the types from
1330 // If a variadic prototype is followed by a non-variadic K&R definition,
1331 // the K&R definition becomes variadic. This is sort of an edge case, but
1332 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and
1334 if (!getLangOptions().CPlusPlus &&
1335 Old->hasPrototype() && !New->hasPrototype() &&
1336 New->getType()->getAs<FunctionProtoType>() &&
1337 Old->getNumParams() == New->getNumParams()) {
1338 llvm::SmallVector<QualType, 16> ArgTypes;
1339 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings;
1340 const FunctionProtoType *OldProto
1341 = Old->getType()->getAs<FunctionProtoType>();
1342 const FunctionProtoType *NewProto
1343 = New->getType()->getAs<FunctionProtoType>();
1345 // Determine whether this is the GNU C extension.
1346 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(),
1347 NewProto->getResultType());
1348 bool LooseCompatible = !MergedReturn.isNull();
1349 for (unsigned Idx = 0, End = Old->getNumParams();
1350 LooseCompatible && Idx != End; ++Idx) {
1351 ParmVarDecl *OldParm = Old->getParamDecl(Idx);
1352 ParmVarDecl *NewParm = New->getParamDecl(Idx);
1353 if (Context.typesAreCompatible(OldParm->getType(),
1354 NewProto->getArgType(Idx))) {
1355 ArgTypes.push_back(NewParm->getType());
1356 } else if (Context.typesAreCompatible(OldParm->getType(),
1358 /*CompareUnqualified=*/true)) {
1359 GNUCompatibleParamWarning Warn
1360 = { OldParm, NewParm, NewProto->getArgType(Idx) };
1361 Warnings.push_back(Warn);
1362 ArgTypes.push_back(NewParm->getType());
1364 LooseCompatible = false;
1367 if (LooseCompatible) {
1368 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) {
1369 Diag(Warnings[Warn].NewParm->getLocation(),
1370 diag::ext_param_promoted_not_compatible_with_prototype)
1371 << Warnings[Warn].PromotedType
1372 << Warnings[Warn].OldParm->getType();
1373 if (Warnings[Warn].OldParm->getLocation().isValid())
1374 Diag(Warnings[Warn].OldParm->getLocation(),
1375 diag::note_previous_declaration);
1378 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0],
1380 OldProto->isVariadic(), 0,
1382 OldProto->getExtInfo()));
1383 return MergeCompatibleFunctionDecls(New, Old);
1386 // Fall through to diagnose conflicting types.
1389 // A function that has already been declared has been redeclared or defined
1390 // with a different type- show appropriate diagnostic
1391 if (unsigned BuiltinID = Old->getBuiltinID()) {
1392 // The user has declared a builtin function with an incompatible
1394 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) {
1395 // The function the user is redeclaring is a library-defined
1396 // function like 'malloc' or 'printf'. Warn about the
1397 // redeclaration, then pretend that we don't know about this
1398 // library built-in.
1399 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New;
1400 Diag(Old->getLocation(), diag::note_previous_builtin_declaration)
1401 << Old << Old->getType();
1402 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin);
1403 Old->setInvalidDecl();
1407 PrevDiag = diag::note_previous_builtin_declaration;
1410 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName();
1411 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
1415 /// \brief Completes the merge of two function declarations that are
1416 /// known to be compatible.
1418 /// This routine handles the merging of attributes and other
1419 /// properties of function declarations form the old declaration to
1420 /// the new declaration, once we know that New is in fact a
1421 /// redeclaration of Old.
1424 bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) {
1425 // Merge the attributes
1426 MergeDeclAttributes(New, Old, Context);
1428 // Merge the storage class.
1429 if (Old->getStorageClass() != SC_Extern &&
1430 Old->getStorageClass() != SC_None)
1431 New->setStorageClass(Old->getStorageClass());
1433 // Merge "pure" flag.
1437 // Merge the "deleted" flag.
1438 if (Old->isDeleted())
1441 if (getLangOptions().CPlusPlus)
1442 return MergeCXXFunctionDecl(New, Old);
1447 /// MergeVarDecl - We just parsed a variable 'New' which has the same name
1448 /// and scope as a previous declaration 'Old'. Figure out how to resolve this
1449 /// situation, merging decls or emitting diagnostics as appropriate.
1451 /// Tentative definition rules (C99 6.9.2p2) are checked by
1452 /// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative
1453 /// definitions here, since the initializer hasn't been attached.
1455 void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) {
1456 // If the new decl is already invalid, don't do any other checking.
1457 if (New->isInvalidDecl())
1460 // Verify the old decl was also a variable.
1462 if (!Previous.isSingleResult() ||
1463 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) {
1464 Diag(New->getLocation(), diag::err_redefinition_different_kind)
1465 << New->getDeclName();
1466 Diag(Previous.getRepresentativeDecl()->getLocation(),
1467 diag::note_previous_definition);
1468 return New->setInvalidDecl();
1471 // C++ [class.mem]p1:
1472 // A member shall not be declared twice in the member-specification [...]
1474 // Here, we need only consider static data members.
1475 if (Old->isStaticDataMember() && !New->isOutOfLine()) {
1476 Diag(New->getLocation(), diag::err_duplicate_member)
1477 << New->getIdentifier();
1478 Diag(Old->getLocation(), diag::note_previous_declaration);
1479 New->setInvalidDecl();
1482 MergeDeclAttributes(New, Old, Context);
1486 if (getLangOptions().CPlusPlus) {
1487 if (Context.hasSameType(New->getType(), Old->getType()))
1488 MergedT = New->getType();
1489 // C++ [basic.link]p10:
1490 // [...] the types specified by all declarations referring to a given
1491 // object or function shall be identical, except that declarations for an
1492 // array object can specify array types that differ by the presence or
1493 // absence of a major array bound (8.3.4).
1494 else if (Old->getType()->isIncompleteArrayType() &&
1495 New->getType()->isArrayType()) {
1496 CanQual<ArrayType> OldArray
1497 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>();
1498 CanQual<ArrayType> NewArray
1499 = Context.getCanonicalType(New->getType())->getAs<ArrayType>();
1500 if (OldArray->getElementType() == NewArray->getElementType())
1501 MergedT = New->getType();
1502 } else if (Old->getType()->isArrayType() &&
1503 New->getType()->isIncompleteArrayType()) {
1504 CanQual<ArrayType> OldArray
1505 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>();
1506 CanQual<ArrayType> NewArray
1507 = Context.getCanonicalType(New->getType())->getAs<ArrayType>();
1508 if (OldArray->getElementType() == NewArray->getElementType())
1509 MergedT = Old->getType();
1510 } else if (New->getType()->isObjCObjectPointerType()
1511 && Old->getType()->isObjCObjectPointerType()) {
1512 MergedT = Context.mergeObjCGCQualifiers(New->getType(), Old->getType());
1515 MergedT = Context.mergeTypes(New->getType(), Old->getType());
1517 if (MergedT.isNull()) {
1518 Diag(New->getLocation(), diag::err_redefinition_different_type)
1519 << New->getDeclName();
1520 Diag(Old->getLocation(), diag::note_previous_definition);
1521 return New->setInvalidDecl();
1523 New->setType(MergedT);
1525 // C99 6.2.2p4: Check if we have a static decl followed by a non-static.
1526 if (New->getStorageClass() == SC_Static &&
1527 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) {
1528 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName();
1529 Diag(Old->getLocation(), diag::note_previous_definition);
1530 return New->setInvalidDecl();
1533 // For an identifier declared with the storage-class specifier
1534 // extern in a scope in which a prior declaration of that
1535 // identifier is visible,23) if the prior declaration specifies
1536 // internal or external linkage, the linkage of the identifier at
1537 // the later declaration is the same as the linkage specified at
1538 // the prior declaration. If no prior declaration is visible, or
1539 // if the prior declaration specifies no linkage, then the
1540 // identifier has external linkage.
1541 if (New->hasExternalStorage() && Old->hasLinkage())
1543 else if (New->getStorageClass() != SC_Static &&
1544 Old->getStorageClass() == SC_Static) {
1545 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName();
1546 Diag(Old->getLocation(), diag::note_previous_definition);
1547 return New->setInvalidDecl();
1550 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup.
1552 // FIXME: The test for external storage here seems wrong? We still
1553 // need to check for mismatches.
1554 if (!New->hasExternalStorage() && !New->isFileVarDecl() &&
1555 // Don't complain about out-of-line definitions of static members.
1556 !(Old->getLexicalDeclContext()->isRecord() &&
1557 !New->getLexicalDeclContext()->isRecord())) {
1558 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName();
1559 Diag(Old->getLocation(), diag::note_previous_definition);
1560 return New->setInvalidDecl();
1563 if (New->isThreadSpecified() && !Old->isThreadSpecified()) {
1564 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName();
1565 Diag(Old->getLocation(), diag::note_previous_definition);
1566 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) {
1567 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName();
1568 Diag(Old->getLocation(), diag::note_previous_definition);
1571 // C++ doesn't have tentative definitions, so go right ahead and check here.
1573 if (getLangOptions().CPlusPlus &&
1574 New->isThisDeclarationADefinition() == VarDecl::Definition &&
1575 (Def = Old->getDefinition())) {
1576 Diag(New->getLocation(), diag::err_redefinition)
1577 << New->getDeclName();
1578 Diag(Def->getLocation(), diag::note_previous_definition);
1579 New->setInvalidDecl();
1583 // For an identifier declared with the storage-class specifier extern in a
1584 // scope in which a prior declaration of that identifier is visible, if
1585 // the prior declaration specifies internal or external linkage, the linkage
1586 // of the identifier at the later declaration is the same as the linkage
1587 // specified at the prior declaration.
1588 // FIXME. revisit this code.
1589 if (New->hasExternalStorage() &&
1590 Old->getLinkage() == InternalLinkage &&
1591 New->getDeclContext() == Old->getDeclContext())
1592 New->setStorageClass(Old->getStorageClass());
1594 // Keep a chain of previous declarations.
1595 New->setPreviousDeclaration(Old);
1597 // Inherit access appropriately.
1598 New->setAccess(Old->getAccess());
1601 /// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with
1602 /// no declarator (e.g. "struct foo;") is parsed.
1603 Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS,
1605 // FIXME: Error on auto/register at file scope
1606 // FIXME: Error on inline/virtual/explicit
1607 // FIXME: Warn on useless __thread
1608 // FIXME: Warn on useless const/volatile
1609 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable
1610 // FIXME: Warn on useless attributes
1613 if (DS.getTypeSpecType() == DeclSpec::TST_class ||
1614 DS.getTypeSpecType() == DeclSpec::TST_struct ||
1615 DS.getTypeSpecType() == DeclSpec::TST_union ||
1616 DS.getTypeSpecType() == DeclSpec::TST_enum) {
1617 TagD = DS.getRepAsDecl();
1619 if (!TagD) // We probably had an error
1622 // Note that the above type specs guarantee that the
1623 // type rep is a Decl, whereas in many of the others
1625 Tag = dyn_cast<TagDecl>(TagD);
1628 if (unsigned TypeQuals = DS.getTypeQualifiers()) {
1629 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object
1630 // or incomplete types shall not be restrict-qualified."
1631 if (TypeQuals & DeclSpec::TQ_restrict)
1632 Diag(DS.getRestrictSpecLoc(),
1633 diag::err_typecheck_invalid_restrict_not_pointer_noarg)
1634 << DS.getSourceRange();
1637 if (DS.isFriendSpecified()) {
1638 // If we're dealing with a class template decl, assume that the
1639 // template routines are handling it.
1640 if (TagD && isa<ClassTemplateDecl>(TagD))
1642 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0));
1645 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) {
1646 ProcessDeclAttributeList(S, Record, DS.getAttributes());
1648 if (!Record->getDeclName() && Record->isDefinition() &&
1649 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) {
1650 if (getLangOptions().CPlusPlus ||
1651 Record->getDeclContext()->isRecord())
1652 return BuildAnonymousStructOrUnion(S, DS, AS, Record);
1654 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators)
1655 << DS.getSourceRange();
1658 // Microsoft allows unnamed struct/union fields. Don't complain
1660 // FIXME: Should we support Microsoft's extensions in this area?
1661 if (Record->getDeclName() && getLangOptions().Microsoft)
1665 if (getLangOptions().CPlusPlus &&
1666 DS.getStorageClassSpec() != DeclSpec::SCS_typedef)
1667 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag))
1668 if (Enum->enumerator_begin() == Enum->enumerator_end() &&
1669 !Enum->getIdentifier() && !Enum->isInvalidDecl())
1670 Diag(Enum->getLocation(), diag::ext_no_declarators)
1671 << DS.getSourceRange();
1673 if (!DS.isMissingDeclaratorOk() &&
1674 DS.getTypeSpecType() != DeclSpec::TST_error) {
1675 // Warn about typedefs of enums without names, since this is an
1676 // extension in both Microsoft and GNU.
1677 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef &&
1678 Tag && isa<EnumDecl>(Tag)) {
1679 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name)
1680 << DS.getSourceRange();
1684 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators)
1685 << DS.getSourceRange();
1691 /// We are trying to inject an anonymous member into the given scope;
1692 /// check if there's an existing declaration that can't be overloaded.
1694 /// \return true if this is a forbidden redeclaration
1695 static bool CheckAnonMemberRedeclaration(Sema &SemaRef,
1698 DeclarationName Name,
1699 SourceLocation NameLoc,
1700 unsigned diagnostic) {
1701 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName,
1702 Sema::ForRedeclaration);
1703 if (!SemaRef.LookupName(R, S)) return false;
1705 if (R.getAsSingle<TagDecl>())
1708 // Pick a representative declaration.
1709 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl();
1710 if (PrevDecl && Owner->isRecord()) {
1711 RecordDecl *Record = cast<RecordDecl>(Owner);
1712 if (!SemaRef.isDeclInScope(PrevDecl, Record, S))
1716 SemaRef.Diag(NameLoc, diagnostic) << Name;
1717 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
1722 /// InjectAnonymousStructOrUnionMembers - Inject the members of the
1723 /// anonymous struct or union AnonRecord into the owning context Owner
1724 /// and scope S. This routine will be invoked just after we realize
1725 /// that an unnamed union or struct is actually an anonymous union or
1732 /// }; // InjectAnonymousStructOrUnionMembers called here to inject i and
1733 /// // f into the surrounding scope.x
1736 /// This routine is recursive, injecting the names of nested anonymous
1737 /// structs/unions into the owning context and scope as well.
1738 static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S,
1740 RecordDecl *AnonRecord,
1741 AccessSpecifier AS) {
1743 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl
1744 : diag::err_anonymous_struct_member_redecl;
1746 bool Invalid = false;
1747 for (RecordDecl::field_iterator F = AnonRecord->field_begin(),
1748 FEnd = AnonRecord->field_end();
1750 if ((*F)->getDeclName()) {
1751 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, (*F)->getDeclName(),
1752 (*F)->getLocation(), diagKind)) {
1753 // C++ [class.union]p2:
1754 // The names of the members of an anonymous union shall be
1755 // distinct from the names of any other entity in the
1756 // scope in which the anonymous union is declared.
1759 // C++ [class.union]p2:
1760 // For the purpose of name lookup, after the anonymous union
1761 // definition, the members of the anonymous union are
1762 // considered to have been defined in the scope in which the
1763 // anonymous union is declared.
1764 Owner->makeDeclVisibleInContext(*F);
1766 SemaRef.IdResolver.AddDecl(*F);
1768 // That includes picking up the appropriate access specifier.
1769 if (AS != AS_none) (*F)->setAccess(AS);
1771 } else if (const RecordType *InnerRecordType
1772 = (*F)->getType()->getAs<RecordType>()) {
1773 RecordDecl *InnerRecord = InnerRecordType->getDecl();
1774 if (InnerRecord->isAnonymousStructOrUnion())
1775 Invalid = Invalid ||
1776 InjectAnonymousStructOrUnionMembers(SemaRef, S, Owner,
1784 /// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to
1785 /// a VarDecl::StorageClass. Any error reporting is up to the caller:
1786 /// illegal input values are mapped to SC_None.
1788 StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) {
1789 switch (StorageClassSpec) {
1790 case DeclSpec::SCS_unspecified: return SC_None;
1791 case DeclSpec::SCS_extern: return SC_Extern;
1792 case DeclSpec::SCS_static: return SC_Static;
1793 case DeclSpec::SCS_auto: return SC_Auto;
1794 case DeclSpec::SCS_register: return SC_Register;
1795 case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
1796 // Illegal SCSs map to None: error reporting is up to the caller.
1797 case DeclSpec::SCS_mutable: // Fall through.
1798 case DeclSpec::SCS_typedef: return SC_None;
1800 llvm_unreachable("unknown storage class specifier");
1803 /// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to
1804 /// a StorageClass. Any error reporting is up to the caller:
1805 /// illegal input values are mapped to SC_None.
1807 StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) {
1808 switch (StorageClassSpec) {
1809 case DeclSpec::SCS_unspecified: return SC_None;
1810 case DeclSpec::SCS_extern: return SC_Extern;
1811 case DeclSpec::SCS_static: return SC_Static;
1812 case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
1813 // Illegal SCSs map to None: error reporting is up to the caller.
1814 case DeclSpec::SCS_auto: // Fall through.
1815 case DeclSpec::SCS_mutable: // Fall through.
1816 case DeclSpec::SCS_register: // Fall through.
1817 case DeclSpec::SCS_typedef: return SC_None;
1819 llvm_unreachable("unknown storage class specifier");
1822 /// ActOnAnonymousStructOrUnion - Handle the declaration of an
1823 /// anonymous structure or union. Anonymous unions are a C++ feature
1824 /// (C++ [class.union]) and a GNU C extension; anonymous structures
1825 /// are a GNU C and GNU C++ extension.
1826 Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
1828 RecordDecl *Record) {
1829 DeclContext *Owner = Record->getDeclContext();
1831 // Diagnose whether this anonymous struct/union is an extension.
1832 if (Record->isUnion() && !getLangOptions().CPlusPlus)
1833 Diag(Record->getLocation(), diag::ext_anonymous_union);
1834 else if (!Record->isUnion())
1835 Diag(Record->getLocation(), diag::ext_anonymous_struct);
1837 // C and C++ require different kinds of checks for anonymous
1839 bool Invalid = false;
1840 if (getLangOptions().CPlusPlus) {
1841 const char* PrevSpec = 0;
1843 // C++ [class.union]p3:
1844 // Anonymous unions declared in a named namespace or in the
1845 // global namespace shall be declared static.
1846 if (DS.getStorageClassSpec() != DeclSpec::SCS_static &&
1847 (isa<TranslationUnitDecl>(Owner) ||
1848 (isa<NamespaceDecl>(Owner) &&
1849 cast<NamespaceDecl>(Owner)->getDeclName()))) {
1850 Diag(Record->getLocation(), diag::err_anonymous_union_not_static);
1853 // Recover by adding 'static'.
1854 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(),
1857 // C++ [class.union]p3:
1858 // A storage class is not allowed in a declaration of an
1859 // anonymous union in a class scope.
1860 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
1861 isa<RecordDecl>(Owner)) {
1862 Diag(DS.getStorageClassSpecLoc(),
1863 diag::err_anonymous_union_with_storage_spec);
1866 // Recover by removing the storage specifier.
1867 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(),
1871 // C++ [class.union]p2:
1872 // The member-specification of an anonymous union shall only
1873 // define non-static data members. [Note: nested types and
1874 // functions cannot be declared within an anonymous union. ]
1875 for (DeclContext::decl_iterator Mem = Record->decls_begin(),
1876 MemEnd = Record->decls_end();
1877 Mem != MemEnd; ++Mem) {
1878 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) {
1879 // C++ [class.union]p3:
1880 // An anonymous union shall not have private or protected
1881 // members (clause 11).
1882 assert(FD->getAccess() != AS_none);
1883 if (FD->getAccess() != AS_public) {
1884 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member)
1885 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected);
1889 if (CheckNontrivialField(FD))
1891 } else if ((*Mem)->isImplicit()) {
1892 // Any implicit members are fine.
1893 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) {
1894 // This is a type that showed up in an
1895 // elaborated-type-specifier inside the anonymous struct or
1896 // union, but which actually declares a type outside of the
1897 // anonymous struct or union. It's okay.
1898 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) {
1899 if (!MemRecord->isAnonymousStructOrUnion() &&
1900 MemRecord->getDeclName()) {
1901 // This is a nested type declaration.
1902 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type)
1903 << (int)Record->isUnion();
1906 } else if (isa<AccessSpecDecl>(*Mem)) {
1907 // Any access specifier is fine.
1909 // We have something that isn't a non-static data
1910 // member. Complain about it.
1911 unsigned DK = diag::err_anonymous_record_bad_member;
1912 if (isa<TypeDecl>(*Mem))
1913 DK = diag::err_anonymous_record_with_type;
1914 else if (isa<FunctionDecl>(*Mem))
1915 DK = diag::err_anonymous_record_with_function;
1916 else if (isa<VarDecl>(*Mem))
1917 DK = diag::err_anonymous_record_with_static;
1918 Diag((*Mem)->getLocation(), DK)
1919 << (int)Record->isUnion();
1925 if (!Record->isUnion() && !Owner->isRecord()) {
1926 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member)
1927 << (int)getLangOptions().CPlusPlus;
1931 // Mock up a declarator.
1932 Declarator Dc(DS, Declarator::TypeNameContext);
1933 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S);
1934 assert(TInfo && "couldn't build declarator info for anonymous struct/union");
1936 // Create a declaration for this anonymous struct/union.
1937 NamedDecl *Anon = 0;
1938 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) {
1939 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(),
1940 /*IdentifierInfo=*/0,
1941 Context.getTypeDeclType(Record),
1943 /*BitWidth=*/0, /*Mutable=*/false);
1944 Anon->setAccess(AS);
1945 if (getLangOptions().CPlusPlus) {
1946 FieldCollector->Add(cast<FieldDecl>(Anon));
1947 if (!cast<CXXRecordDecl>(Record)->isEmpty())
1948 cast<CXXRecordDecl>(OwningClass)->setEmpty(false);
1951 DeclSpec::SCS SCSpec = DS.getStorageClassSpec();
1952 assert(SCSpec != DeclSpec::SCS_typedef &&
1953 "Parser allowed 'typedef' as storage class VarDecl.");
1954 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec);
1955 if (SCSpec == DeclSpec::SCS_mutable) {
1956 // mutable can only appear on non-static class members, so it's always
1958 Diag(Record->getLocation(), diag::err_mutable_nonmember);
1962 SCSpec = DS.getStorageClassSpecAsWritten();
1963 VarDecl::StorageClass SCAsWritten
1964 = StorageClassSpecToVarDeclStorageClass(SCSpec);
1966 Anon = VarDecl::Create(Context, Owner, Record->getLocation(),
1967 /*IdentifierInfo=*/0,
1968 Context.getTypeDeclType(Record),
1969 TInfo, SC, SCAsWritten);
1971 Anon->setImplicit();
1973 // Add the anonymous struct/union object to the current
1974 // context. We'll be referencing this object when we refer to one of
1976 Owner->addDecl(Anon);
1978 // Inject the members of the anonymous struct/union into the owning
1979 // context and into the identifier resolver chain for name lookup
1981 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS))
1984 // Mark this as an anonymous struct/union type. Note that we do not
1985 // do this until after we have already checked and injected the
1986 // members of this anonymous struct/union type, because otherwise
1987 // the members could be injected twice: once by DeclContext when it
1988 // builds its lookup table, and once by
1989 // InjectAnonymousStructOrUnionMembers.
1990 Record->setAnonymousStructOrUnion(true);
1993 Anon->setInvalidDecl();
1999 /// GetNameForDeclarator - Determine the full declaration name for the
2000 /// given Declarator.
2001 DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) {
2002 return GetNameFromUnqualifiedId(D.getName());
2005 /// \brief Retrieves the declaration name from a parsed unqualified-id.
2007 Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) {
2008 DeclarationNameInfo NameInfo;
2009 NameInfo.setLoc(Name.StartLocation);
2011 switch (Name.getKind()) {
2013 case UnqualifiedId::IK_Identifier:
2014 NameInfo.setName(Name.Identifier);
2015 NameInfo.setLoc(Name.StartLocation);
2018 case UnqualifiedId::IK_OperatorFunctionId:
2019 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName(
2020 Name.OperatorFunctionId.Operator));
2021 NameInfo.setLoc(Name.StartLocation);
2022 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc
2023 = Name.OperatorFunctionId.SymbolLocations[0];
2024 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc
2025 = Name.EndLocation.getRawEncoding();
2028 case UnqualifiedId::IK_LiteralOperatorId:
2029 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName(
2031 NameInfo.setLoc(Name.StartLocation);
2032 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation);
2035 case UnqualifiedId::IK_ConversionFunctionId: {
2036 TypeSourceInfo *TInfo;
2037 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo);
2039 return DeclarationNameInfo();
2040 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName(
2041 Context.getCanonicalType(Ty)));
2042 NameInfo.setLoc(Name.StartLocation);
2043 NameInfo.setNamedTypeInfo(TInfo);
2047 case UnqualifiedId::IK_ConstructorName: {
2048 TypeSourceInfo *TInfo;
2049 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo);
2051 return DeclarationNameInfo();
2052 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName(
2053 Context.getCanonicalType(Ty)));
2054 NameInfo.setLoc(Name.StartLocation);
2055 NameInfo.setNamedTypeInfo(TInfo);
2059 case UnqualifiedId::IK_ConstructorTemplateId: {
2060 // In well-formed code, we can only have a constructor
2061 // template-id that refers to the current context, so go there
2062 // to find the actual type being constructed.
2063 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext);
2064 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name)
2065 return DeclarationNameInfo();
2067 // Determine the type of the class being constructed.
2068 QualType CurClassType = Context.getTypeDeclType(CurClass);
2070 // FIXME: Check two things: that the template-id names the same type as
2071 // CurClassType, and that the template-id does not occur when the name
2074 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName(
2075 Context.getCanonicalType(CurClassType)));
2076 NameInfo.setLoc(Name.StartLocation);
2077 // FIXME: should we retrieve TypeSourceInfo?
2078 NameInfo.setNamedTypeInfo(0);
2082 case UnqualifiedId::IK_DestructorName: {
2083 TypeSourceInfo *TInfo;
2084 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo);
2086 return DeclarationNameInfo();
2087 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName(
2088 Context.getCanonicalType(Ty)));
2089 NameInfo.setLoc(Name.StartLocation);
2090 NameInfo.setNamedTypeInfo(TInfo);
2094 case UnqualifiedId::IK_TemplateId: {
2095 TemplateName TName = Name.TemplateId->Template.get();
2096 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc;
2097 return Context.getNameForTemplate(TName, TNameLoc);
2100 } // switch (Name.getKind())
2102 assert(false && "Unknown name kind");
2103 return DeclarationNameInfo();
2106 /// isNearlyMatchingFunction - Determine whether the C++ functions
2107 /// Declaration and Definition are "nearly" matching. This heuristic
2108 /// is used to improve diagnostics in the case where an out-of-line
2109 /// function definition doesn't match any declaration within
2110 /// the class or namespace.
2111 static bool isNearlyMatchingFunction(ASTContext &Context,
2112 FunctionDecl *Declaration,
2113 FunctionDecl *Definition) {
2114 if (Declaration->param_size() != Definition->param_size())
2116 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) {
2117 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType();
2118 QualType DefParamTy = Definition->getParamDecl(Idx)->getType();
2120 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(),
2121 DefParamTy.getNonReferenceType()))
2128 /// NeedsRebuildingInCurrentInstantiation - Checks whether the given
2129 /// declarator needs to be rebuilt in the current instantiation.
2130 /// Any bits of declarator which appear before the name are valid for
2131 /// consideration here. That's specifically the type in the decl spec
2132 /// and the base type in any member-pointer chunks.
2133 static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D,
2134 DeclarationName Name) {
2135 // The types we specifically need to rebuild are:
2136 // - typenames, typeofs, and decltypes
2137 // - types which will become injected class names
2138 // Of course, we also need to rebuild any type referencing such a
2139 // type. It's safest to just say "dependent", but we call out a
2142 DeclSpec &DS = D.getMutableDeclSpec();
2143 switch (DS.getTypeSpecType()) {
2144 case DeclSpec::TST_typename:
2145 case DeclSpec::TST_typeofType:
2146 case DeclSpec::TST_decltype: {
2147 // Grab the type from the parser.
2148 TypeSourceInfo *TSI = 0;
2149 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI);
2150 if (T.isNull() || !T->isDependentType()) break;
2152 // Make sure there's a type source info. This isn't really much
2153 // of a waste; most dependent types should have type source info
2154 // attached already.
2156 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc());
2158 // Rebuild the type in the current instantiation.
2159 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name);
2160 if (!TSI) return true;
2162 // Store the new type back in the decl spec.
2163 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI);
2164 DS.UpdateTypeRep(LocType);
2168 case DeclSpec::TST_typeofExpr: {
2169 Expr *E = DS.getRepAsExpr();
2170 ExprResult Result = S.RebuildExprInCurrentInstantiation(E);
2171 if (Result.isInvalid()) return true;
2172 DS.UpdateExprRep(Result.get());
2177 // Nothing to do for these decl specs.
2181 // It doesn't matter what order we do this in.
2182 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) {
2183 DeclaratorChunk &Chunk = D.getTypeObject(I);
2185 // The only type information in the declarator which can come
2186 // before the declaration name is the base type of a member
2188 if (Chunk.Kind != DeclaratorChunk::MemberPointer)
2191 // Rebuild the scope specifier in-place.
2192 CXXScopeSpec &SS = Chunk.Mem.Scope();
2193 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS))
2200 Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) {
2201 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), false);
2204 Decl *Sema::HandleDeclarator(Scope *S, Declarator &D,
2205 MultiTemplateParamsArg TemplateParamLists,
2206 bool IsFunctionDefinition) {
2207 // TODO: consider using NameInfo for diagnostic.
2208 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
2209 DeclarationName Name = NameInfo.getName();
2211 // All of these full declarators require an identifier. If it doesn't have
2212 // one, the ParsedFreeStandingDeclSpec action should be used.
2214 if (!D.isInvalidType()) // Reject this if we think it is valid.
2215 Diag(D.getDeclSpec().getSourceRange().getBegin(),
2216 diag::err_declarator_need_ident)
2217 << D.getDeclSpec().getSourceRange() << D.getSourceRange();
2221 // The scope passed in may not be a decl scope. Zip up the scope tree until
2222 // we find one that is.
2223 while ((S->getFlags() & Scope::DeclScope) == 0 ||
2224 (S->getFlags() & Scope::TemplateParamScope) != 0)
2227 DeclContext *DC = CurContext;
2228 if (D.getCXXScopeSpec().isInvalid())
2230 else if (D.getCXXScopeSpec().isSet()) {
2231 bool EnteringContext = !D.getDeclSpec().isFriendSpecified();
2232 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext);
2234 // If we could not compute the declaration context, it's because the
2235 // declaration context is dependent but does not refer to a class,
2236 // class template, or class template partial specialization. Complain
2237 // and return early, to avoid the coming semantic disaster.
2238 Diag(D.getIdentifierLoc(),
2239 diag::err_template_qualified_declarator_no_match)
2240 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep()
2241 << D.getCXXScopeSpec().getRange();
2245 bool IsDependentContext = DC->isDependentContext();
2247 if (!IsDependentContext &&
2248 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC))
2251 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) {
2252 Diag(D.getIdentifierLoc(),
2253 diag::err_member_def_undefined_record)
2254 << Name << DC << D.getCXXScopeSpec().getRange();
2258 // Check whether we need to rebuild the type of the given
2259 // declaration in the current instantiation.
2260 if (EnteringContext && IsDependentContext &&
2261 TemplateParamLists.size() != 0) {
2262 ContextRAII SavedContext(*this, DC);
2263 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name))
2270 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
2271 QualType R = TInfo->getType();
2273 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
2276 // See if this is a redefinition of a variable in the same scope.
2277 if (!D.getCXXScopeSpec().isSet()) {
2278 bool IsLinkageLookup = false;
2280 // If the declaration we're planning to build will be a function
2281 // or object with linkage, then look for another declaration with
2282 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6).
2283 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
2285 else if (R->isFunctionType()) {
2286 if (CurContext->isFunctionOrMethod() ||
2287 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)
2288 IsLinkageLookup = true;
2289 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern)
2290 IsLinkageLookup = true;
2291 else if (CurContext->getRedeclContext()->isTranslationUnit() &&
2292 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)
2293 IsLinkageLookup = true;
2295 if (IsLinkageLookup)
2296 Previous.clear(LookupRedeclarationWithLinkage);
2298 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup);
2299 } else { // Something like "int foo::x;"
2300 LookupQualifiedName(Previous, DC);
2302 // Don't consider using declarations as previous declarations for
2303 // out-of-line members.
2304 RemoveUsingDecls(Previous);
2307 // Members (including explicit specializations of templates) of a named
2308 // namespace can also be defined outside that namespace by explicit
2309 // qualification of the name being defined, provided that the entity being
2310 // defined was already declared in the namespace and the definition appears
2311 // after the point of declaration in a namespace that encloses the
2312 // declarations namespace.
2314 // Note that we only check the context at this point. We don't yet
2315 // have enough information to make sure that PrevDecl is actually
2316 // the declaration we want to match. For example, given:
2323 // void X::f(int) { } // ill-formed
2325 // In this case, PrevDecl will point to the overload set
2326 // containing the two f's declared in X, but neither of them
2329 // First check whether we named the global scope.
2330 if (isa<TranslationUnitDecl>(DC)) {
2331 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope)
2332 << Name << D.getCXXScopeSpec().getRange();
2334 DeclContext *Cur = CurContext;
2335 while (isa<LinkageSpecDecl>(Cur))
2336 Cur = Cur->getParent();
2337 if (!Cur->Encloses(DC)) {
2338 // The qualifying scope doesn't enclose the original declaration.
2339 // Emit diagnostic based on current scope.
2340 SourceLocation L = D.getIdentifierLoc();
2341 SourceRange R = D.getCXXScopeSpec().getRange();
2342 if (isa<FunctionDecl>(Cur))
2343 Diag(L, diag::err_invalid_declarator_in_function) << Name << R;
2345 Diag(L, diag::err_invalid_declarator_scope)
2346 << Name << cast<NamedDecl>(DC) << R;
2352 if (Previous.isSingleResult() &&
2353 Previous.getFoundDecl()->isTemplateParameter()) {
2354 // Maybe we will complain about the shadowed template parameter.
2355 if (!D.isInvalidType())
2356 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(),
2357 Previous.getFoundDecl()))
2360 // Just pretend that we didn't see the previous declaration.
2364 // In C++, the previous declaration we find might be a tag type
2365 // (class or enum). In this case, the new declaration will hide the
2366 // tag type. Note that this does does not apply if we're declaring a
2367 // typedef (C++ [dcl.typedef]p4).
2368 if (Previous.isSingleTagDecl() &&
2369 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef)
2372 bool Redeclaration = false;
2373 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) {
2374 if (TemplateParamLists.size()) {
2375 Diag(D.getIdentifierLoc(), diag::err_template_typedef);
2379 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration);
2380 } else if (R->isFunctionType()) {
2381 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous,
2382 move(TemplateParamLists),
2383 IsFunctionDefinition, Redeclaration);
2385 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous,
2386 move(TemplateParamLists),
2393 // If this has an identifier and is not an invalid redeclaration or
2394 // function template specialization, add it to the scope stack.
2395 if (New->getDeclName() && !(Redeclaration && New->isInvalidDecl()))
2396 PushOnScopeChains(New, S);
2401 /// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array
2402 /// types into constant array types in certain situations which would otherwise
2403 /// be errors (for GCC compatibility).
2404 static QualType TryToFixInvalidVariablyModifiedType(QualType T,
2405 ASTContext &Context,
2406 bool &SizeIsNegative,
2407 llvm::APSInt &Oversized) {
2408 // This method tries to turn a variable array into a constant
2409 // array even when the size isn't an ICE. This is necessary
2410 // for compatibility with code that depends on gcc's buggy
2411 // constant expression folding, like struct {char x[(int)(char*)2];}
2412 SizeIsNegative = false;
2415 if (T->isDependentType())
2418 QualifierCollector Qs;
2419 const Type *Ty = Qs.strip(T);
2421 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) {
2422 QualType Pointee = PTy->getPointeeType();
2423 QualType FixedType =
2424 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative,
2426 if (FixedType.isNull()) return FixedType;
2427 FixedType = Context.getPointerType(FixedType);
2428 return Qs.apply(FixedType);
2431 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T);
2434 // FIXME: We should probably handle this case
2435 if (VLATy->getElementType()->isVariablyModifiedType())
2438 Expr::EvalResult EvalResult;
2439 if (!VLATy->getSizeExpr() ||
2440 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) ||
2441 !EvalResult.Val.isInt())
2444 // Check whether the array size is negative.
2445 llvm::APSInt &Res = EvalResult.Val.getInt();
2446 if (Res.isSigned() && Res.isNegative()) {
2447 SizeIsNegative = true;
2451 // Check whether the array is too large to be addressed.
2452 unsigned ActiveSizeBits
2453 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(),
2455 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
2460 return Context.getConstantArrayType(VLATy->getElementType(),
2461 Res, ArrayType::Normal, 0);
2464 /// \brief Register the given locally-scoped external C declaration so
2465 /// that it can be found later for redeclarations
2467 Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND,
2468 const LookupResult &Previous,
2470 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() &&
2471 "Decl is not a locally-scoped decl!");
2472 // Note that we have a locally-scoped external with this name.
2473 LocallyScopedExternalDecls[ND->getDeclName()] = ND;
2475 if (!Previous.isSingleResult())
2478 NamedDecl *PrevDecl = Previous.getFoundDecl();
2480 // If there was a previous declaration of this variable, it may be
2481 // in our identifier chain. Update the identifier chain with the new
2483 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) {
2484 // The previous declaration was found on the identifer resolver
2485 // chain, so remove it from its scope.
2486 while (S && !S->isDeclScope(PrevDecl))
2490 S->RemoveDecl(PrevDecl);
2494 /// \brief Diagnose function specifiers on a declaration of an identifier that
2495 /// does not identify a function.
2496 void Sema::DiagnoseFunctionSpecifiers(Declarator& D) {
2497 // FIXME: We should probably indicate the identifier in question to avoid
2498 // confusion for constructs like "inline int a(), b;"
2499 if (D.getDeclSpec().isInlineSpecified())
2500 Diag(D.getDeclSpec().getInlineSpecLoc(),
2501 diag::err_inline_non_function);
2503 if (D.getDeclSpec().isVirtualSpecified())
2504 Diag(D.getDeclSpec().getVirtualSpecLoc(),
2505 diag::err_virtual_non_function);
2507 if (D.getDeclSpec().isExplicitSpecified())
2508 Diag(D.getDeclSpec().getExplicitSpecLoc(),
2509 diag::err_explicit_non_function);
2513 Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
2514 QualType R, TypeSourceInfo *TInfo,
2515 LookupResult &Previous, bool &Redeclaration) {
2516 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1).
2517 if (D.getCXXScopeSpec().isSet()) {
2518 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator)
2519 << D.getCXXScopeSpec().getRange();
2521 // Pretend we didn't see the scope specifier.
2526 if (getLangOptions().CPlusPlus) {
2527 // Check that there are no default arguments (C++ only).
2528 CheckExtraCXXDefaultArguments(D);
2531 DiagnoseFunctionSpecifiers(D);
2533 if (D.getDeclSpec().isThreadSpecified())
2534 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
2536 if (D.getName().Kind != UnqualifiedId::IK_Identifier) {
2537 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier)
2538 << D.getName().getSourceRange();
2542 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo);
2543 if (!NewTD) return 0;
2545 // Handle attributes prior to checking for duplicates in MergeVarDecl
2546 ProcessDeclAttributes(S, NewTD, D);
2548 // C99 6.7.7p2: If a typedef name specifies a variably modified type
2549 // then it shall have block scope.
2550 // Note that variably modified types must be fixed before merging the decl so
2551 // that redeclarations will match.
2552 QualType T = NewTD->getUnderlyingType();
2553 if (T->isVariablyModifiedType()) {
2554 getCurFunction()->setHasBranchProtectedScope();
2556 if (S->getFnParent() == 0) {
2557 bool SizeIsNegative;
2558 llvm::APSInt Oversized;
2560 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative,
2562 if (!FixedTy.isNull()) {
2563 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size);
2564 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy));
2567 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size);
2568 else if (T->isVariableArrayType())
2569 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope);
2570 else if (Oversized.getBoolValue())
2571 Diag(D.getIdentifierLoc(), diag::err_array_too_large)
2572 << Oversized.toString(10);
2574 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope);
2575 NewTD->setInvalidDecl();
2580 // Merge the decl with the existing one if appropriate. If the decl is
2581 // in an outer scope, it isn't the same thing.
2582 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false);
2583 if (!Previous.empty()) {
2584 Redeclaration = true;
2585 MergeTypeDefDecl(NewTD, Previous);
2588 // If this is the C FILE type, notify the AST context.
2589 if (IdentifierInfo *II = NewTD->getIdentifier())
2590 if (!NewTD->isInvalidDecl() &&
2591 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) {
2592 if (II->isStr("FILE"))
2593 Context.setFILEDecl(NewTD);
2594 else if (II->isStr("jmp_buf"))
2595 Context.setjmp_bufDecl(NewTD);
2596 else if (II->isStr("sigjmp_buf"))
2597 Context.setsigjmp_bufDecl(NewTD);
2603 /// \brief Determines whether the given declaration is an out-of-scope
2604 /// previous declaration.
2606 /// This routine should be invoked when name lookup has found a
2607 /// previous declaration (PrevDecl) that is not in the scope where a
2608 /// new declaration by the same name is being introduced. If the new
2609 /// declaration occurs in a local scope, previous declarations with
2610 /// linkage may still be considered previous declarations (C99
2611 /// 6.2.2p4-5, C++ [basic.link]p6).
2613 /// \param PrevDecl the previous declaration found by name
2616 /// \param DC the context in which the new declaration is being
2619 /// \returns true if PrevDecl is an out-of-scope previous declaration
2620 /// for a new delcaration with the same name.
2622 isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC,
2623 ASTContext &Context) {
2627 if (!PrevDecl->hasLinkage())
2630 if (Context.getLangOptions().CPlusPlus) {
2631 // C++ [basic.link]p6:
2632 // If there is a visible declaration of an entity with linkage
2633 // having the same name and type, ignoring entities declared
2634 // outside the innermost enclosing namespace scope, the block
2635 // scope declaration declares that same entity and receives the
2636 // linkage of the previous declaration.
2637 DeclContext *OuterContext = DC->getRedeclContext();
2638 if (!OuterContext->isFunctionOrMethod())
2639 // This rule only applies to block-scope declarations.
2642 DeclContext *PrevOuterContext = PrevDecl->getDeclContext();
2643 if (PrevOuterContext->isRecord())
2644 // We found a member function: ignore it.
2647 // Find the innermost enclosing namespace for the new and
2648 // previous declarations.
2649 OuterContext = OuterContext->getEnclosingNamespaceContext();
2650 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext();
2652 // The previous declaration is in a different namespace, so it
2653 // isn't the same function.
2654 if (!OuterContext->Equals(PrevOuterContext))
2661 static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) {
2662 CXXScopeSpec &SS = D.getCXXScopeSpec();
2663 if (!SS.isSet()) return;
2664 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()),
2669 Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC,
2670 QualType R, TypeSourceInfo *TInfo,
2671 LookupResult &Previous,
2672 MultiTemplateParamsArg TemplateParamLists,
2673 bool &Redeclaration) {
2674 DeclarationName Name = GetNameForDeclarator(D).getName();
2676 // Check that there are no default arguments (C++ only).
2677 if (getLangOptions().CPlusPlus)
2678 CheckExtraCXXDefaultArguments(D);
2680 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec();
2681 assert(SCSpec != DeclSpec::SCS_typedef &&
2682 "Parser allowed 'typedef' as storage class VarDecl.");
2683 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec);
2684 if (SCSpec == DeclSpec::SCS_mutable) {
2685 // mutable can only appear on non-static class members, so it's always
2687 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember);
2691 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten();
2692 VarDecl::StorageClass SCAsWritten
2693 = StorageClassSpecToVarDeclStorageClass(SCSpec);
2695 IdentifierInfo *II = Name.getAsIdentifierInfo();
2697 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name)
2698 << Name.getAsString();
2702 DiagnoseFunctionSpecifiers(D);
2704 if (!DC->isRecord() && S->getFnParent() == 0) {
2705 // C99 6.9p2: The storage-class specifiers auto and register shall not
2706 // appear in the declaration specifiers in an external declaration.
2707 if (SC == SC_Auto || SC == SC_Register) {
2709 // If this is a register variable with an asm label specified, then this
2710 // is a GNU extension.
2711 if (SC == SC_Register && D.getAsmLabel())
2712 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register);
2714 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope);
2718 if (DC->isRecord() && !CurContext->isRecord()) {
2719 // This is an out-of-line definition of a static data member.
2720 if (SC == SC_Static) {
2721 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
2722 diag::err_static_out_of_line)
2723 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
2724 } else if (SC == SC_None)
2727 if (SC == SC_Static) {
2728 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) {
2729 if (RD->isLocalClass())
2730 Diag(D.getIdentifierLoc(),
2731 diag::err_static_data_member_not_allowed_in_local_class)
2732 << Name << RD->getDeclName();
2736 // Match up the template parameter lists with the scope specifier, then
2737 // determine whether we have a template or a template specialization.
2738 bool isExplicitSpecialization = false;
2739 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size();
2740 bool Invalid = false;
2741 if (TemplateParameterList *TemplateParams
2742 = MatchTemplateParametersToScopeSpecifier(
2743 D.getDeclSpec().getSourceRange().getBegin(),
2744 D.getCXXScopeSpec(),
2745 (TemplateParameterList**)TemplateParamLists.get(),
2746 TemplateParamLists.size(),
2747 /*never a friend*/ false,
2748 isExplicitSpecialization,
2750 // All but one template parameter lists have been matching.
2751 --NumMatchedTemplateParamLists;
2753 if (TemplateParams->size() > 0) {
2754 // There is no such thing as a variable template.
2755 Diag(D.getIdentifierLoc(), diag::err_template_variable)
2757 << SourceRange(TemplateParams->getTemplateLoc(),
2758 TemplateParams->getRAngleLoc());
2761 // There is an extraneous 'template<>' for this variable. Complain
2762 // about it, but allow the declaration of the variable.
2763 Diag(TemplateParams->getTemplateLoc(),
2764 diag::err_template_variable_noparams)
2766 << SourceRange(TemplateParams->getTemplateLoc(),
2767 TemplateParams->getRAngleLoc());
2769 isExplicitSpecialization = true;
2773 VarDecl *NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(),
2774 II, R, TInfo, SC, SCAsWritten);
2776 if (D.isInvalidType() || Invalid)
2777 NewVD->setInvalidDecl();
2779 SetNestedNameSpecifier(NewVD, D);
2781 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) {
2782 NewVD->setTemplateParameterListsInfo(Context,
2783 NumMatchedTemplateParamLists,
2784 (TemplateParameterList**)TemplateParamLists.release());
2787 if (D.getDeclSpec().isThreadSpecified()) {
2788 if (NewVD->hasLocalStorage())
2789 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global);
2790 else if (!Context.Target.isTLSSupported())
2791 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported);
2793 NewVD->setThreadSpecified(true);
2796 // Set the lexical context. If the declarator has a C++ scope specifier, the
2797 // lexical context will be different from the semantic context.
2798 NewVD->setLexicalDeclContext(CurContext);
2800 // Handle attributes prior to checking for duplicates in MergeVarDecl
2801 ProcessDeclAttributes(S, NewVD, D);
2803 // Handle GNU asm-label extension (encoded as an attribute).
2804 if (Expr *E = (Expr*) D.getAsmLabel()) {
2805 // The parser guarantees this is a string.
2806 StringLiteral *SE = cast<StringLiteral>(E);
2807 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0),
2808 Context, SE->getString()));
2811 // Diagnose shadowed variables before filtering for scope.
2812 if (!D.getCXXScopeSpec().isSet())
2813 CheckShadow(S, NewVD, Previous);
2815 // Don't consider existing declarations that are in a different
2816 // scope and are out-of-semantic-context declarations (if the new
2817 // declaration has linkage).
2818 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage());
2820 // Merge the decl with the existing one if appropriate.
2821 if (!Previous.empty()) {
2822 if (Previous.isSingleResult() &&
2823 isa<FieldDecl>(Previous.getFoundDecl()) &&
2824 D.getCXXScopeSpec().isSet()) {
2825 // The user tried to define a non-static data member
2826 // out-of-line (C++ [dcl.meaning]p1).
2827 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line)
2828 << D.getCXXScopeSpec().getRange();
2830 NewVD->setInvalidDecl();
2832 } else if (D.getCXXScopeSpec().isSet()) {
2833 // No previous declaration in the qualifying scope.
2834 Diag(D.getIdentifierLoc(), diag::err_no_member)
2835 << Name << computeDeclContext(D.getCXXScopeSpec(), true)
2836 << D.getCXXScopeSpec().getRange();
2837 NewVD->setInvalidDecl();
2840 CheckVariableDeclaration(NewVD, Previous, Redeclaration);
2842 // This is an explicit specialization of a static data member. Check it.
2843 if (isExplicitSpecialization && !NewVD->isInvalidDecl() &&
2844 CheckMemberSpecialization(NewVD, Previous))
2845 NewVD->setInvalidDecl();
2847 // attributes declared post-definition are currently ignored
2848 // FIXME: This should be handled in attribute merging, not
2850 if (Previous.isSingleResult()) {
2851 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl());
2852 if (Def && (Def = Def->getDefinition()) &&
2853 Def != NewVD && D.hasAttributes()) {
2854 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition);
2855 Diag(Def->getLocation(), diag::note_previous_definition);
2859 // If this is a locally-scoped extern C variable, update the map of
2861 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() &&
2862 !NewVD->isInvalidDecl())
2863 RegisterLocallyScopedExternCDecl(NewVD, Previous, S);
2865 // If there's a #pragma GCC visibility in scope, and this isn't a class
2866 // member, set the visibility of this variable.
2867 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord())
2868 AddPushedVisibilityAttribute(NewVD);
2870 MarkUnusedFileScopedDecl(NewVD);
2875 /// \brief Diagnose variable or built-in function shadowing. Implements
2878 /// This method is called whenever a VarDecl is added to a "useful"
2881 /// \param S the scope in which the shadowing name is being declared
2882 /// \param R the lookup of the name
2884 void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) {
2885 // Return if warning is ignored.
2886 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow) == Diagnostic::Ignored)
2889 // Don't diagnose declarations at file scope. The scope might not
2890 // have a DeclContext if (e.g.) we're parsing a function prototype.
2891 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity());
2892 if (NewDC && NewDC->isFileContext())
2895 // Only diagnose if we're shadowing an unambiguous field or variable.
2896 if (R.getResultKind() != LookupResult::Found)
2899 NamedDecl* ShadowedDecl = R.getFoundDecl();
2900 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl))
2903 DeclContext *OldDC = ShadowedDecl->getDeclContext();
2905 // Only warn about certain kinds of shadowing for class members.
2906 if (NewDC && NewDC->isRecord()) {
2907 // In particular, don't warn about shadowing non-class members.
2908 if (!OldDC->isRecord())
2911 // TODO: should we warn about static data members shadowing
2912 // static data members from base classes?
2914 // TODO: don't diagnose for inaccessible shadowed members.
2915 // This is hard to do perfectly because we might friend the
2916 // shadowing context, but that's just a false negative.
2919 // Determine what kind of declaration we're shadowing.
2921 if (isa<RecordDecl>(OldDC)) {
2922 if (isa<FieldDecl>(ShadowedDecl))
2925 Kind = 2; // static data member
2926 } else if (OldDC->isFileContext())
2931 DeclarationName Name = R.getLookupName();
2933 // Emit warning and note.
2934 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC;
2935 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration);
2938 /// \brief Check -Wshadow without the advantage of a previous lookup.
2939 void Sema::CheckShadow(Scope *S, VarDecl *D) {
2940 LookupResult R(*this, D->getDeclName(), D->getLocation(),
2941 Sema::LookupOrdinaryName, Sema::ForRedeclaration);
2943 CheckShadow(S, D, R);
2946 /// \brief Perform semantic checking on a newly-created variable
2949 /// This routine performs all of the type-checking required for a
2950 /// variable declaration once it has been built. It is used both to
2951 /// check variables after they have been parsed and their declarators
2952 /// have been translated into a declaration, and to check variables
2953 /// that have been instantiated from a template.
2955 /// Sets NewVD->isInvalidDecl() if an error was encountered.
2956 void Sema::CheckVariableDeclaration(VarDecl *NewVD,
2957 LookupResult &Previous,
2958 bool &Redeclaration) {
2959 // If the decl is already known invalid, don't check it.
2960 if (NewVD->isInvalidDecl())
2963 QualType T = NewVD->getType();
2965 if (T->isObjCObjectType()) {
2966 Diag(NewVD->getLocation(), diag::err_statically_allocated_object);
2967 return NewVD->setInvalidDecl();
2970 // Emit an error if an address space was applied to decl with local storage.
2971 // This includes arrays of objects with address space qualifiers, but not
2972 // automatic variables that point to other address spaces.
2973 // ISO/IEC TR 18037 S5.1.2
2974 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) {
2975 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl);
2976 return NewVD->setInvalidDecl();
2979 if (NewVD->hasLocalStorage() && T.isObjCGCWeak()
2980 && !NewVD->hasAttr<BlocksAttr>())
2981 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local);
2983 bool isVM = T->isVariablyModifiedType();
2984 if (isVM || NewVD->hasAttr<CleanupAttr>() ||
2985 NewVD->hasAttr<BlocksAttr>())
2986 getCurFunction()->setHasBranchProtectedScope();
2988 if ((isVM && NewVD->hasLinkage()) ||
2989 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) {
2990 bool SizeIsNegative;
2991 llvm::APSInt Oversized;
2993 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative,
2996 if (FixedTy.isNull() && T->isVariableArrayType()) {
2997 const VariableArrayType *VAT = Context.getAsVariableArrayType(T);
2998 // FIXME: This won't give the correct result for
3000 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange();
3002 if (NewVD->isFileVarDecl())
3003 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope)
3005 else if (NewVD->getStorageClass() == SC_Static)
3006 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage)
3009 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage)
3011 return NewVD->setInvalidDecl();
3014 if (FixedTy.isNull()) {
3015 if (NewVD->isFileVarDecl())
3016 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope);
3018 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage);
3019 return NewVD->setInvalidDecl();
3022 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size);
3023 NewVD->setType(FixedTy);
3026 if (Previous.empty() && NewVD->isExternC()) {
3027 // Since we did not find anything by this name and we're declaring
3028 // an extern "C" variable, look for a non-visible extern "C"
3029 // declaration with the same name.
3030 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
3031 = LocallyScopedExternalDecls.find(NewVD->getDeclName());
3032 if (Pos != LocallyScopedExternalDecls.end())
3033 Previous.addDecl(Pos->second);
3036 if (T->isVoidType() && !NewVD->hasExternalStorage()) {
3037 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type)
3039 return NewVD->setInvalidDecl();
3042 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) {
3043 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal);
3044 return NewVD->setInvalidDecl();
3047 if (isVM && NewVD->hasAttr<BlocksAttr>()) {
3048 Diag(NewVD->getLocation(), diag::err_block_on_vm);
3049 return NewVD->setInvalidDecl();
3052 // Function pointers and references cannot have qualified function type, only
3053 // function pointer-to-members can do that.
3055 unsigned PtrOrRef = 0;
3056 if (const PointerType *Ptr = T->getAs<PointerType>())
3057 Pointee = Ptr->getPointeeType();
3058 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) {
3059 Pointee = Ref->getPointeeType();
3062 if (!Pointee.isNull() && Pointee->isFunctionProtoType() &&
3063 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) {
3064 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer)
3066 return NewVD->setInvalidDecl();
3069 if (!Previous.empty()) {
3070 Redeclaration = true;
3071 MergeVarDecl(NewVD, Previous);
3075 /// \brief Data used with FindOverriddenMethod
3076 struct FindOverriddenMethodData {
3078 CXXMethodDecl *Method;
3081 /// \brief Member lookup function that determines whether a given C++
3082 /// method overrides a method in a base class, to be used with
3083 /// CXXRecordDecl::lookupInBases().
3084 static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier,
3087 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl();
3089 FindOverriddenMethodData *Data
3090 = reinterpret_cast<FindOverriddenMethodData*>(UserData);
3092 DeclarationName Name = Data->Method->getDeclName();
3094 // FIXME: Do we care about other names here too?
3095 if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
3096 // We really want to find the base class destructor here.
3097 QualType T = Data->S->Context.getTypeDeclType(BaseRecord);
3098 CanQualType CT = Data->S->Context.getCanonicalType(T);
3100 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT);
3103 for (Path.Decls = BaseRecord->lookup(Name);
3104 Path.Decls.first != Path.Decls.second;
3105 ++Path.Decls.first) {
3106 NamedDecl *D = *Path.Decls.first;
3107 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
3108 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false))
3116 /// AddOverriddenMethods - See if a method overrides any in the base classes,
3117 /// and if so, check that it's a valid override and remember it.
3118 void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) {
3119 // Look for virtual methods in base classes that this method might override.
3121 FindOverriddenMethodData Data;
3124 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) {
3125 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(),
3126 E = Paths.found_decls_end(); I != E; ++I) {
3127 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) {
3128 if (!CheckOverridingFunctionReturnType(MD, OldMD) &&
3129 !CheckOverridingFunctionExceptionSpec(MD, OldMD) &&
3130 !CheckOverridingFunctionAttributes(MD, OldMD))
3131 MD->addOverriddenMethod(OldMD->getCanonicalDecl());
3138 Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC,
3139 QualType R, TypeSourceInfo *TInfo,
3140 LookupResult &Previous,
3141 MultiTemplateParamsArg TemplateParamLists,
3142 bool IsFunctionDefinition, bool &Redeclaration) {
3143 assert(R.getTypePtr()->isFunctionType());
3145 // TODO: consider using NameInfo for diagnostic.
3146 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
3147 DeclarationName Name = NameInfo.getName();
3148 FunctionDecl::StorageClass SC = SC_None;
3149 switch (D.getDeclSpec().getStorageClassSpec()) {
3150 default: assert(0 && "Unknown storage class!");
3151 case DeclSpec::SCS_auto:
3152 case DeclSpec::SCS_register:
3153 case DeclSpec::SCS_mutable:
3154 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
3155 diag::err_typecheck_sclass_func);
3158 case DeclSpec::SCS_unspecified: SC = SC_None; break;
3159 case DeclSpec::SCS_extern: SC = SC_Extern; break;
3160 case DeclSpec::SCS_static: {
3161 if (CurContext->getRedeclContext()->isFunctionOrMethod()) {
3163 // The declaration of an identifier for a function that has
3164 // block scope shall have no explicit storage-class specifier
3165 // other than extern
3166 // See also (C++ [dcl.stc]p4).
3167 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
3168 diag::err_static_block_func);
3174 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern;break;
3177 if (D.getDeclSpec().isThreadSpecified())
3178 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
3180 bool isFriend = D.getDeclSpec().isFriendSpecified();
3181 bool isInline = D.getDeclSpec().isInlineSpecified();
3182 bool isVirtual = D.getDeclSpec().isVirtualSpecified();
3183 bool isExplicit = D.getDeclSpec().isExplicitSpecified();
3185 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten();
3186 FunctionDecl::StorageClass SCAsWritten
3187 = StorageClassSpecToFunctionDeclStorageClass(SCSpec);
3189 // Check that the return type is not an abstract class type.
3190 // For record types, this is done by the AbstractClassUsageDiagnoser once
3191 // the class has been completely parsed.
3192 if (!DC->isRecord() &&
3193 RequireNonAbstractType(D.getIdentifierLoc(),
3194 R->getAs<FunctionType>()->getResultType(),
3195 diag::err_abstract_type_in_decl,
3196 AbstractReturnType))
3199 // Do not allow returning a objc interface by-value.
3200 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) {
3201 Diag(D.getIdentifierLoc(),
3202 diag::err_object_cannot_be_passed_returned_by_value) << 0
3203 << R->getAs<FunctionType>()->getResultType();
3207 bool isVirtualOkay = false;
3208 FunctionDecl *NewFD;
3211 // C++ [class.friend]p5
3212 // A function can be defined in a friend declaration of a
3213 // class . . . . Such a function is implicitly inline.
3214 isInline |= IsFunctionDefinition;
3217 if (Name.getNameKind() == DeclarationName::CXXConstructorName) {
3218 // This is a C++ constructor declaration.
3219 assert(DC->isRecord() &&
3220 "Constructors can only be declared in a member context");
3222 R = CheckConstructorDeclarator(D, R, SC);
3224 // Create the new declaration
3225 NewFD = CXXConstructorDecl::Create(Context,
3226 cast<CXXRecordDecl>(DC),
3228 isExplicit, isInline,
3229 /*isImplicitlyDeclared=*/false);
3230 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
3231 // This is a C++ destructor declaration.
3232 if (DC->isRecord()) {
3233 R = CheckDestructorDeclarator(D, R, SC);
3235 NewFD = CXXDestructorDecl::Create(Context,
3236 cast<CXXRecordDecl>(DC),
3239 /*isImplicitlyDeclared=*/false);
3240 NewFD->setTypeSourceInfo(TInfo);
3242 isVirtualOkay = true;
3244 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member);
3246 // Create a FunctionDecl to satisfy the function definition parsing
3248 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(),
3249 Name, R, TInfo, SC, SCAsWritten, isInline,
3250 /*hasPrototype=*/true);
3253 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
3254 if (!DC->isRecord()) {
3255 Diag(D.getIdentifierLoc(),
3256 diag::err_conv_function_not_member);
3260 CheckConversionDeclarator(D, R, SC);
3261 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC),
3263 isInline, isExplicit);
3265 isVirtualOkay = true;
3266 } else if (DC->isRecord()) {
3267 // If the of the function is the same as the name of the record, then this
3268 // must be an invalid constructor that has a return type.
3269 // (The parser checks for a return type and makes the declarator a
3270 // constructor if it has no return type).
3271 // must have an invalid constructor that has a return type
3272 if (Name.getAsIdentifierInfo() &&
3273 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){
3274 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type)
3275 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
3276 << SourceRange(D.getIdentifierLoc());
3280 bool isStatic = SC == SC_Static;
3283 // Any allocation function for a class T is a static member
3284 // (even if not explicitly declared static).
3285 if (Name.getCXXOverloadedOperator() == OO_New ||
3286 Name.getCXXOverloadedOperator() == OO_Array_New)
3289 // [class.free]p6 Any deallocation function for a class X is a static member
3290 // (even if not explicitly declared static).
3291 if (Name.getCXXOverloadedOperator() == OO_Delete ||
3292 Name.getCXXOverloadedOperator() == OO_Array_Delete)
3295 // This is a C++ method declaration.
3296 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC),
3298 isStatic, SCAsWritten, isInline);
3300 isVirtualOkay = !isStatic;
3302 // Determine whether the function was written with a
3303 // prototype. This true when:
3304 // - we're in C++ (where every function has a prototype),
3305 // - there is a prototype in the declarator, or
3306 // - the type R of the function is some kind of typedef or other reference
3307 // to a type name (which eventually refers to a function type).
3309 getLangOptions().CPlusPlus ||
3310 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) ||
3311 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType());
3313 NewFD = FunctionDecl::Create(Context, DC,
3314 NameInfo, R, TInfo, SC, SCAsWritten, isInline,
3318 if (D.isInvalidType())
3319 NewFD->setInvalidDecl();
3321 SetNestedNameSpecifier(NewFD, D);
3323 // Set the lexical context. If the declarator has a C++
3324 // scope specifier, or is the object of a friend declaration, the
3325 // lexical context will be different from the semantic context.
3326 NewFD->setLexicalDeclContext(CurContext);
3328 // Match up the template parameter lists with the scope specifier, then
3329 // determine whether we have a template or a template specialization.
3330 FunctionTemplateDecl *FunctionTemplate = 0;
3331 bool isExplicitSpecialization = false;
3332 bool isFunctionTemplateSpecialization = false;
3333 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size();
3334 bool Invalid = false;
3335 if (TemplateParameterList *TemplateParams
3336 = MatchTemplateParametersToScopeSpecifier(
3337 D.getDeclSpec().getSourceRange().getBegin(),
3338 D.getCXXScopeSpec(),
3339 (TemplateParameterList**)TemplateParamLists.get(),
3340 TemplateParamLists.size(),
3342 isExplicitSpecialization,
3344 // All but one template parameter lists have been matching.
3345 --NumMatchedTemplateParamLists;
3347 if (TemplateParams->size() > 0) {
3348 // This is a function template
3350 // Check that we can declare a template here.
3351 if (CheckTemplateDeclScope(S, TemplateParams))
3354 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC,
3355 NewFD->getLocation(),
3356 Name, TemplateParams,
3358 FunctionTemplate->setLexicalDeclContext(CurContext);
3359 NewFD->setDescribedFunctionTemplate(FunctionTemplate);
3361 // This is a function template specialization.
3362 isFunctionTemplateSpecialization = true;
3364 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);".
3365 if (isFriend && isFunctionTemplateSpecialization) {
3366 // We want to remove the "template<>", found here.
3367 SourceRange RemoveRange = TemplateParams->getSourceRange();
3369 // If we remove the template<> and the name is not a
3370 // template-id, we're actually silently creating a problem:
3371 // the friend declaration will refer to an untemplated decl,
3372 // and clearly the user wants a template specialization. So
3373 // we need to insert '<>' after the name.
3374 SourceLocation InsertLoc;
3375 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) {
3376 InsertLoc = D.getName().getSourceRange().getEnd();
3377 InsertLoc = PP.getLocForEndOfToken(InsertLoc);
3380 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend)
3381 << Name << RemoveRange
3382 << FixItHint::CreateRemoval(RemoveRange)
3383 << FixItHint::CreateInsertion(InsertLoc, "<>");
3388 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) {
3389 NewFD->setTemplateParameterListsInfo(Context,
3390 NumMatchedTemplateParamLists,
3391 (TemplateParameterList**)TemplateParamLists.release());
3395 NewFD->setInvalidDecl();
3396 if (FunctionTemplate)
3397 FunctionTemplate->setInvalidDecl();
3400 // C++ [dcl.fct.spec]p5:
3401 // The virtual specifier shall only be used in declarations of
3402 // nonstatic class member functions that appear within a
3403 // member-specification of a class declaration; see 10.3.
3405 if (isVirtual && !NewFD->isInvalidDecl()) {
3406 if (!isVirtualOkay) {
3407 Diag(D.getDeclSpec().getVirtualSpecLoc(),
3408 diag::err_virtual_non_function);
3409 } else if (!CurContext->isRecord()) {
3410 // 'virtual' was specified outside of the class.
3411 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class)
3412 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc());
3414 // Okay: Add virtual to the method.
3415 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC);
3416 CurClass->setMethodAsVirtual(NewFD);
3420 // C++ [dcl.fct.spec]p3:
3421 // The inline specifier shall not appear on a block scope function declaration.
3422 if (isInline && !NewFD->isInvalidDecl() && getLangOptions().CPlusPlus) {
3423 if (CurContext->isFunctionOrMethod()) {
3424 // 'inline' is not allowed on block scope function declaration.
3425 Diag(D.getDeclSpec().getInlineSpecLoc(),
3426 diag::err_inline_declaration_block_scope) << Name
3427 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc());
3431 // C++ [dcl.fct.spec]p6:
3432 // The explicit specifier shall be used only in the declaration of a
3433 // constructor or conversion function within its class definition; see 12.3.1
3435 if (isExplicit && !NewFD->isInvalidDecl()) {
3436 if (!CurContext->isRecord()) {
3437 // 'explicit' was specified outside of the class.
3438 Diag(D.getDeclSpec().getExplicitSpecLoc(),
3439 diag::err_explicit_out_of_class)
3440 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
3441 } else if (!isa<CXXConstructorDecl>(NewFD) &&
3442 !isa<CXXConversionDecl>(NewFD)) {
3443 // 'explicit' was specified on a function that wasn't a constructor
3444 // or conversion function.
3445 Diag(D.getDeclSpec().getExplicitSpecLoc(),
3446 diag::err_explicit_non_ctor_or_conv_function)
3447 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
3451 // Filter out previous declarations that don't match the scope.
3452 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage());
3455 // DC is the namespace in which the function is being declared.
3456 assert((DC->isFileContext() || !Previous.empty()) &&
3457 "previously-undeclared friend function being created "
3458 "in a non-namespace context");
3460 // For now, claim that the objects have no previous declaration.
3461 if (FunctionTemplate) {
3462 FunctionTemplate->setObjectOfFriendDecl(false);
3463 FunctionTemplate->setAccess(AS_public);
3465 NewFD->setObjectOfFriendDecl(false);
3466 NewFD->setAccess(AS_public);
3469 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) &&
3470 !CurContext->isRecord()) {
3471 // C++ [class.static]p1:
3472 // A data or function member of a class may be declared static
3473 // in a class definition, in which case it is a static member of
3476 // Complain about the 'static' specifier if it's on an out-of-line
3477 // member function definition.
3478 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
3479 diag::err_static_out_of_line)
3480 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
3483 // Handle GNU asm-label extension (encoded as an attribute).
3484 if (Expr *E = (Expr*) D.getAsmLabel()) {
3485 // The parser guarantees this is a string.
3486 StringLiteral *SE = cast<StringLiteral>(E);
3487 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context,
3491 // Copy the parameter declarations from the declarator D to the function
3492 // declaration NewFD, if they are available. First scavenge them into Params.
3493 llvm::SmallVector<ParmVarDecl*, 16> Params;
3494 if (D.getNumTypeObjects() > 0) {
3495 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
3497 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs
3498 // function that takes no arguments, not a function that takes a
3499 // single void argument.
3500 // We let through "const void" here because Sema::GetTypeForDeclarator
3501 // already checks for that case.
3502 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
3503 FTI.ArgInfo[0].Param &&
3504 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) {
3505 // Empty arg list, don't push any params.
3506 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param);
3508 // In C++, the empty parameter-type-list must be spelled "void"; a
3509 // typedef of void is not permitted.
3510 if (getLangOptions().CPlusPlus &&
3511 Param->getType().getUnqualifiedType() != Context.VoidTy)
3512 Diag(Param->getLocation(), diag::err_param_typedef_of_void);
3513 // FIXME: Leaks decl?
3514 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) {
3515 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) {
3516 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param);
3517 assert(Param->getDeclContext() != NewFD && "Was set before ?");
3518 Param->setDeclContext(NewFD);
3519 Params.push_back(Param);
3521 if (Param->isInvalidDecl())
3522 NewFD->setInvalidDecl();
3526 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) {
3527 // When we're declaring a function with a typedef, typeof, etc as in the
3528 // following example, we'll need to synthesize (unnamed)
3529 // parameters for use in the declaration.
3532 // typedef void fn(int);
3536 // Synthesize a parameter for each argument type.
3537 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(),
3538 AE = FT->arg_type_end(); AI != AE; ++AI) {
3539 ParmVarDecl *Param =
3540 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI);
3541 Params.push_back(Param);
3544 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 &&
3545 "Should not need args for typedef of non-prototype fn");
3547 // Finally, we know we have the right number of parameters, install them.
3548 NewFD->setParams(Params.data(), Params.size());
3550 // If the declarator is a template-id, translate the parser's template
3551 // argument list into our AST format.
3552 bool HasExplicitTemplateArgs = false;
3553 TemplateArgumentListInfo TemplateArgs;
3554 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) {
3555 TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
3556 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc);
3557 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc);
3558 ASTTemplateArgsPtr TemplateArgsPtr(*this,
3559 TemplateId->getTemplateArgs(),
3560 TemplateId->NumArgs);
3561 translateTemplateArguments(TemplateArgsPtr,
3563 TemplateArgsPtr.release();
3565 HasExplicitTemplateArgs = true;
3567 if (FunctionTemplate) {
3568 // FIXME: Diagnose function template with explicit template
3570 HasExplicitTemplateArgs = false;
3571 } else if (!isFunctionTemplateSpecialization &&
3572 !D.getDeclSpec().isFriendSpecified()) {
3573 // We have encountered something that the user meant to be a
3574 // specialization (because it has explicitly-specified template
3575 // arguments) but that was not introduced with a "template<>" (or had
3576 // too few of them).
3577 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header)
3578 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc)
3579 << FixItHint::CreateInsertion(
3580 D.getDeclSpec().getSourceRange().getBegin(),
3582 isFunctionTemplateSpecialization = true;
3584 // "friend void foo<>(int);" is an implicit specialization decl.
3585 isFunctionTemplateSpecialization = true;
3587 } else if (isFriend && isFunctionTemplateSpecialization) {
3588 // This combination is only possible in a recovery case; the user
3589 // wrote something like:
3590 // template <> friend void foo(int);
3591 // which we're recovering from as if the user had written:
3592 // friend void foo<>(int);
3593 // Go ahead and fake up a template id.
3594 HasExplicitTemplateArgs = true;
3595 TemplateArgs.setLAngleLoc(D.getIdentifierLoc());
3596 TemplateArgs.setRAngleLoc(D.getIdentifierLoc());
3599 // If it's a friend (and only if it's a friend), it's possible
3600 // that either the specialized function type or the specialized
3601 // template is dependent, and therefore matching will fail. In
3602 // this case, don't check the specialization yet.
3603 if (isFunctionTemplateSpecialization && isFriend &&
3604 (NewFD->getType()->isDependentType() || DC->isDependentContext())) {
3605 assert(HasExplicitTemplateArgs &&
3606 "friend function specialization without template args");
3607 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs,
3609 NewFD->setInvalidDecl();
3610 } else if (isFunctionTemplateSpecialization) {
3611 if (CheckFunctionTemplateSpecialization(NewFD,
3612 (HasExplicitTemplateArgs ? &TemplateArgs : 0),
3614 NewFD->setInvalidDecl();
3615 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) {
3616 if (CheckMemberSpecialization(NewFD, Previous))
3617 NewFD->setInvalidDecl();
3620 // Perform semantic checking on the function declaration.
3621 bool OverloadableAttrRequired = false; // FIXME: HACK!
3622 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization,
3623 Redeclaration, /*FIXME:*/OverloadableAttrRequired);
3625 assert((NewFD->isInvalidDecl() || !Redeclaration ||
3626 Previous.getResultKind() != LookupResult::FoundOverloaded) &&
3627 "previous declaration set still overloaded");
3629 NamedDecl *PrincipalDecl = (FunctionTemplate
3630 ? cast<NamedDecl>(FunctionTemplate)
3633 if (isFriend && Redeclaration) {
3634 AccessSpecifier Access = AS_public;
3635 if (!NewFD->isInvalidDecl())
3636 Access = NewFD->getPreviousDeclaration()->getAccess();
3638 NewFD->setAccess(Access);
3639 if (FunctionTemplate) FunctionTemplate->setAccess(Access);
3641 PrincipalDecl->setObjectOfFriendDecl(true);
3644 if (NewFD->isOverloadedOperator() && !DC->isRecord() &&
3645 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary))
3646 PrincipalDecl->setNonMemberOperator();
3648 // If we have a function template, check the template parameter
3649 // list. This will check and merge default template arguments.
3650 if (FunctionTemplate) {
3651 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration();
3652 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(),
3653 PrevTemplate? PrevTemplate->getTemplateParameters() : 0,
3654 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate
3655 : TPC_FunctionTemplate);
3658 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) {
3659 // Fake up an access specifier if it's supposed to be a class member.
3660 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext()))
3661 NewFD->setAccess(AS_public);
3663 // An out-of-line member function declaration must also be a
3664 // definition (C++ [dcl.meaning]p1).
3665 // Note that this is not the case for explicit specializations of
3666 // function templates or member functions of class templates, per
3667 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension
3668 // for compatibility with old SWIG code which likes to generate them.
3669 if (!IsFunctionDefinition && !isFriend &&
3670 !isFunctionTemplateSpecialization && !isExplicitSpecialization) {
3671 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration)
3672 << D.getCXXScopeSpec().getRange();
3674 if (!Redeclaration && !(isFriend && CurContext->isDependentContext())) {
3675 // The user tried to provide an out-of-line definition for a
3676 // function that is a member of a class or namespace, but there
3677 // was no such member function declared (C++ [class.mfct]p2,
3678 // C++ [namespace.memdef]p2). For example:
3684 // void X::f() { } // ill-formed
3686 // Complain about this problem, and attempt to suggest close
3687 // matches (e.g., those that differ only in cv-qualifiers and
3688 // whether the parameter types are references).
3689 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match)
3690 << Name << DC << D.getCXXScopeSpec().getRange();
3691 NewFD->setInvalidDecl();
3693 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName,
3695 LookupQualifiedName(Prev, DC);
3696 assert(!Prev.isAmbiguous() &&
3697 "Cannot have an ambiguity in previous-declaration lookup");
3698 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end();
3699 Func != FuncEnd; ++Func) {
3700 if (isa<FunctionDecl>(*Func) &&
3701 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD))
3702 Diag((*Func)->getLocation(), diag::note_member_def_close_match);
3707 // Handle attributes. We need to have merged decls when handling attributes
3708 // (for example to check for conflicts, etc).
3709 // FIXME: This needs to happen before we merge declarations. Then,
3710 // let attribute merging cope with attribute conflicts.
3711 ProcessDeclAttributes(S, NewFD, D);
3713 // attributes declared post-definition are currently ignored
3714 // FIXME: This should happen during attribute merging
3715 if (Redeclaration && Previous.isSingleResult()) {
3716 const FunctionDecl *Def;
3717 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl());
3718 if (PrevFD && PrevFD->hasBody(Def) && D.hasAttributes()) {
3719 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition);
3720 Diag(Def->getLocation(), diag::note_previous_definition);
3724 AddKnownFunctionAttributes(NewFD);
3726 if (OverloadableAttrRequired && !NewFD->hasAttr<OverloadableAttr>()) {
3727 // If a function name is overloadable in C, then every function
3728 // with that name must be marked "overloadable".
3729 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing)
3730 << Redeclaration << NewFD;
3731 if (!Previous.empty())
3732 Diag(Previous.getRepresentativeDecl()->getLocation(),
3733 diag::note_attribute_overloadable_prev_overload);
3734 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), Context));
3737 if (NewFD->hasAttr<OverloadableAttr>() &&
3738 !NewFD->getType()->getAs<FunctionProtoType>()) {
3739 Diag(NewFD->getLocation(),
3740 diag::err_attribute_overloadable_no_prototype)
3743 // Turn this into a variadic function with no parameters.
3744 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>();
3745 QualType R = Context.getFunctionType(FT->getResultType(),
3746 0, 0, true, 0, false, false, 0, 0,
3751 // If there's a #pragma GCC visibility in scope, and this isn't a class
3752 // member, set the visibility of this function.
3753 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord())
3754 AddPushedVisibilityAttribute(NewFD);
3756 // If this is a locally-scoped extern C function, update the
3757 // map of such names.
3758 if (CurContext->isFunctionOrMethod() && NewFD->isExternC()
3759 && !NewFD->isInvalidDecl())
3760 RegisterLocallyScopedExternCDecl(NewFD, Previous, S);
3762 // Set this FunctionDecl's range up to the right paren.
3763 NewFD->setLocEnd(D.getSourceRange().getEnd());
3765 if (FunctionTemplate && NewFD->isInvalidDecl())
3766 FunctionTemplate->setInvalidDecl();
3768 if (FunctionTemplate)
3769 return FunctionTemplate;
3771 MarkUnusedFileScopedDecl(NewFD);
3776 /// \brief Perform semantic checking of a new function declaration.
3778 /// Performs semantic analysis of the new function declaration
3779 /// NewFD. This routine performs all semantic checking that does not
3780 /// require the actual declarator involved in the declaration, and is
3781 /// used both for the declaration of functions as they are parsed
3782 /// (called via ActOnDeclarator) and for the declaration of functions
3783 /// that have been instantiated via C++ template instantiation (called
3784 /// via InstantiateDecl).
3786 /// \param IsExplicitSpecialiation whether this new function declaration is
3787 /// an explicit specialization of the previous declaration.
3789 /// This sets NewFD->isInvalidDecl() to true if there was an error.
3790 void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD,
3791 LookupResult &Previous,
3792 bool IsExplicitSpecialization,
3793 bool &Redeclaration,
3794 bool &OverloadableAttrRequired) {
3795 // If NewFD is already known erroneous, don't do any of this checking.
3796 if (NewFD->isInvalidDecl()) {
3797 // If this is a class member, mark the class invalid immediately.
3798 // This avoids some consistency errors later.
3799 if (isa<CXXMethodDecl>(NewFD))
3800 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl();
3805 if (NewFD->getResultType()->isVariablyModifiedType()) {
3806 // Functions returning a variably modified type violate C99 6.7.5.2p2
3807 // because all functions have linkage.
3808 Diag(NewFD->getLocation(), diag::err_vm_func_decl);
3809 return NewFD->setInvalidDecl();
3812 if (NewFD->isMain())
3815 // Check for a previous declaration of this name.
3816 if (Previous.empty() && NewFD->isExternC()) {
3817 // Since we did not find anything by this name and we're declaring
3818 // an extern "C" function, look for a non-visible extern "C"
3819 // declaration with the same name.
3820 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
3821 = LocallyScopedExternalDecls.find(NewFD->getDeclName());
3822 if (Pos != LocallyScopedExternalDecls.end())
3823 Previous.addDecl(Pos->second);
3826 // Merge or overload the declaration with an existing declaration of
3827 // the same name, if appropriate.
3828 if (!Previous.empty()) {
3829 // Determine whether NewFD is an overload of PrevDecl or
3830 // a declaration that requires merging. If it's an overload,
3831 // there's no more work to do here; we'll just add the new
3832 // function to the scope.
3834 NamedDecl *OldDecl = 0;
3835 if (!AllowOverloadingOfFunction(Previous, Context)) {
3836 Redeclaration = true;
3837 OldDecl = Previous.getFoundDecl();
3839 if (!getLangOptions().CPlusPlus)
3840 OverloadableAttrRequired = true;
3842 switch (CheckOverload(S, NewFD, Previous, OldDecl,
3843 /*NewIsUsingDecl*/ false)) {
3845 Redeclaration = true;
3848 case Ovl_NonFunction:
3849 Redeclaration = true;
3853 Redeclaration = false;
3858 if (Redeclaration) {
3859 // NewFD and OldDecl represent declarations that need to be
3861 if (MergeFunctionDecl(NewFD, OldDecl))
3862 return NewFD->setInvalidDecl();
3865 Previous.addDecl(OldDecl);
3867 if (FunctionTemplateDecl *OldTemplateDecl
3868 = dyn_cast<FunctionTemplateDecl>(OldDecl)) {
3869 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl());
3870 FunctionTemplateDecl *NewTemplateDecl
3871 = NewFD->getDescribedFunctionTemplate();
3872 assert(NewTemplateDecl && "Template/non-template mismatch");
3873 if (CXXMethodDecl *Method
3874 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) {
3875 Method->setAccess(OldTemplateDecl->getAccess());
3876 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess());
3879 // If this is an explicit specialization of a member that is a function
3880 // template, mark it as a member specialization.
3881 if (IsExplicitSpecialization &&
3882 NewTemplateDecl->getInstantiatedFromMemberTemplate()) {
3883 NewTemplateDecl->setMemberSpecialization();
3884 assert(OldTemplateDecl->isMemberSpecialization());
3887 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions
3888 NewFD->setAccess(OldDecl->getAccess());
3889 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl));
3894 // Semantic checking for this function declaration (in isolation).
3895 if (getLangOptions().CPlusPlus) {
3896 // C++-specific checks.
3897 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) {
3898 CheckConstructor(Constructor);
3899 } else if (CXXDestructorDecl *Destructor =
3900 dyn_cast<CXXDestructorDecl>(NewFD)) {
3901 CXXRecordDecl *Record = Destructor->getParent();
3902 QualType ClassType = Context.getTypeDeclType(Record);
3904 // FIXME: Shouldn't we be able to perform this check even when the class
3905 // type is dependent? Both gcc and edg can handle that.
3906 if (!ClassType->isDependentType()) {
3907 DeclarationName Name
3908 = Context.DeclarationNames.getCXXDestructorName(
3909 Context.getCanonicalType(ClassType));
3910 // NewFD->getDeclName().dump();
3912 if (NewFD->getDeclName() != Name) {
3913 Diag(NewFD->getLocation(), diag::err_destructor_name);
3914 return NewFD->setInvalidDecl();
3918 Record->setUserDeclaredDestructor(true);
3919 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no
3920 // user-defined destructor.
3921 Record->setPOD(false);
3923 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly-
3924 // declared destructor.
3925 // FIXME: C++0x: don't do this for "= default" destructors
3926 Record->setHasTrivialDestructor(false);
3927 } else if (CXXConversionDecl *Conversion
3928 = dyn_cast<CXXConversionDecl>(NewFD)) {
3929 ActOnConversionDeclarator(Conversion);
3932 // Find any virtual functions that this function overrides.
3933 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) {
3934 if (!Method->isFunctionTemplateSpecialization() &&
3935 !Method->getDescribedFunctionTemplate())
3936 AddOverriddenMethods(Method->getParent(), Method);
3939 // Extra checking for C++ overloaded operators (C++ [over.oper]).
3940 if (NewFD->isOverloadedOperator() &&
3941 CheckOverloadedOperatorDeclaration(NewFD))
3942 return NewFD->setInvalidDecl();
3944 // Extra checking for C++0x literal operators (C++0x [over.literal]).
3945 if (NewFD->getLiteralIdentifier() &&
3946 CheckLiteralOperatorDeclaration(NewFD))
3947 return NewFD->setInvalidDecl();
3949 // In C++, check default arguments now that we have merged decls. Unless
3950 // the lexical context is the class, because in this case this is done
3951 // during delayed parsing anyway.
3952 if (!CurContext->isRecord())
3953 CheckCXXDefaultArguments(NewFD);
3957 void Sema::CheckMain(FunctionDecl* FD) {
3958 // C++ [basic.start.main]p3: A program that declares main to be inline
3959 // or static is ill-formed.
3960 // C99 6.7.4p4: In a hosted environment, the inline function specifier
3961 // shall not appear in a declaration of main.
3962 // static main is not an error under C99, but we should warn about it.
3963 bool isInline = FD->isInlineSpecified();
3964 bool isStatic = FD->getStorageClass() == SC_Static;
3965 if (isInline || isStatic) {
3966 unsigned diagID = diag::warn_unusual_main_decl;
3967 if (isInline || getLangOptions().CPlusPlus)
3968 diagID = diag::err_unusual_main_decl;
3970 int which = isStatic + (isInline << 1) - 1;
3971 Diag(FD->getLocation(), diagID) << which;
3974 QualType T = FD->getType();
3975 assert(T->isFunctionType() && "function decl is not of function type");
3976 const FunctionType* FT = T->getAs<FunctionType>();
3978 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) {
3979 // TODO: add a replacement fixit to turn the return type into 'int'.
3980 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint);
3981 FD->setInvalidDecl(true);
3984 // Treat protoless main() as nullary.
3985 if (isa<FunctionNoProtoType>(FT)) return;
3987 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT);
3988 unsigned nparams = FTP->getNumArgs();
3989 assert(FD->getNumParams() == nparams);
3991 bool HasExtraParameters = (nparams > 3);
3993 // Darwin passes an undocumented fourth argument of type char**. If
3994 // other platforms start sprouting these, the logic below will start
3997 Context.Target.getTriple().getOS() == llvm::Triple::Darwin)
3998 HasExtraParameters = false;
4000 if (HasExtraParameters) {
4001 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams;
4002 FD->setInvalidDecl(true);
4006 // FIXME: a lot of the following diagnostics would be improved
4007 // if we had some location information about types.
4010 Context.getPointerType(Context.getPointerType(Context.CharTy));
4011 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP };
4013 for (unsigned i = 0; i < nparams; ++i) {
4014 QualType AT = FTP->getArgType(i);
4016 bool mismatch = true;
4018 if (Context.hasSameUnqualifiedType(AT, Expected[i]))
4020 else if (Expected[i] == CharPP) {
4021 // As an extension, the following forms are okay:
4023 // char const * const *
4026 QualifierCollector qs;
4027 const PointerType* PT;
4028 if ((PT = qs.strip(AT)->getAs<PointerType>()) &&
4029 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) &&
4030 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) {
4032 mismatch = !qs.empty();
4037 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i];
4038 // TODO: suggest replacing given type with expected type
4039 FD->setInvalidDecl(true);
4043 if (nparams == 1 && !FD->isInvalidDecl()) {
4044 Diag(FD->getLocation(), diag::warn_main_one_arg);
4048 bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) {
4049 // FIXME: Need strict checking. In C89, we need to check for
4050 // any assignment, increment, decrement, function-calls, or
4051 // commas outside of a sizeof. In C99, it's the same list,
4052 // except that the aforementioned are allowed in unevaluated
4053 // expressions. Everything else falls under the
4054 // "may accept other forms of constant expressions" exception.
4055 // (We never end up here for C++, so the constant expression
4056 // rules there don't matter.)
4057 if (Init->isConstantInitializer(Context, false))
4059 Diag(Init->getExprLoc(), diag::err_init_element_not_constant)
4060 << Init->getSourceRange();
4064 void Sema::AddInitializerToDecl(Decl *dcl, Expr *init) {
4065 AddInitializerToDecl(dcl, init, /*DirectInit=*/false);
4068 /// AddInitializerToDecl - Adds the initializer Init to the
4069 /// declaration dcl. If DirectInit is true, this is C++ direct
4070 /// initialization rather than copy initialization.
4071 void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, bool DirectInit) {
4072 // If there is no declaration, there was an error parsing it. Just ignore
4077 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) {
4078 // With declarators parsed the way they are, the parser cannot
4079 // distinguish between a normal initializer and a pure-specifier.
4080 // Thus this grotesque test.
4082 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 &&
4083 Context.getCanonicalType(IL->getType()) == Context.IntTy)
4084 CheckPureMethod(Method, Init->getSourceRange());
4086 Diag(Method->getLocation(), diag::err_member_function_initialization)
4087 << Method->getDeclName() << Init->getSourceRange();
4088 Method->setInvalidDecl();
4093 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl);
4095 if (getLangOptions().CPlusPlus &&
4096 RealDecl->getLexicalDeclContext()->isRecord() &&
4097 isa<NamedDecl>(RealDecl))
4098 Diag(RealDecl->getLocation(), diag::err_member_initialization)
4099 << cast<NamedDecl>(RealDecl)->getDeclName();
4101 Diag(RealDecl->getLocation(), diag::err_illegal_initializer);
4102 RealDecl->setInvalidDecl();
4108 // A definition must end up with a complete type, which means it must be
4109 // complete with the restriction that an array type might be completed by the
4110 // initializer; note that later code assumes this restriction.
4111 QualType BaseDeclType = VDecl->getType();
4112 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType))
4113 BaseDeclType = Array->getElementType();
4114 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType,
4115 diag::err_typecheck_decl_incomplete_type)) {
4116 RealDecl->setInvalidDecl();
4120 // The variable can not have an abstract class type.
4121 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(),
4122 diag::err_abstract_type_in_decl,
4123 AbstractVariableType))
4124 VDecl->setInvalidDecl();
4127 if ((Def = VDecl->getDefinition()) && Def != VDecl) {
4128 Diag(VDecl->getLocation(), diag::err_redefinition)
4129 << VDecl->getDeclName();
4130 Diag(Def->getLocation(), diag::note_previous_definition);
4131 VDecl->setInvalidDecl();
4135 // C++ [class.static.data]p4
4136 // If a static data member is of const integral or const
4137 // enumeration type, its declaration in the class definition can
4138 // specify a constant-initializer which shall be an integral
4139 // constant expression (5.19). In that case, the member can appear
4140 // in integral constant expressions. The member shall still be
4141 // defined in a namespace scope if it is used in the program and the
4142 // namespace scope definition shall not contain an initializer.
4144 // We already performed a redefinition check above, but for static
4145 // data members we also need to check whether there was an in-class
4146 // declaration with an initializer.
4147 const VarDecl* PrevInit = 0;
4148 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) {
4149 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName();
4150 Diag(PrevInit->getLocation(), diag::note_previous_definition);
4154 if (getLangOptions().CPlusPlus && VDecl->hasLocalStorage())
4155 getCurFunction()->setHasBranchProtectedScope();
4157 // Capture the variable that is being initialized and the style of
4159 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl);
4161 // FIXME: Poor source location information.
4162 InitializationKind Kind
4163 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(),
4164 Init->getLocStart(),
4166 : InitializationKind::CreateCopy(VDecl->getLocation(),
4167 Init->getLocStart());
4169 // Get the decls type and save a reference for later, since
4170 // CheckInitializerTypes may change it.
4171 QualType DclT = VDecl->getType(), SavT = DclT;
4172 if (VDecl->isBlockVarDecl()) {
4173 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5
4174 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init);
4175 VDecl->setInvalidDecl();
4176 } else if (!VDecl->isInvalidDecl()) {
4177 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1);
4178 ExprResult Result = InitSeq.Perform(*this, Entity, Kind,
4179 MultiExprArg(*this, &Init, 1),
4181 if (Result.isInvalid()) {
4182 VDecl->setInvalidDecl();
4186 Init = Result.takeAs<Expr>();
4188 // C++ 3.6.2p2, allow dynamic initialization of static initializers.
4189 // Don't check invalid declarations to avoid emitting useless diagnostics.
4190 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) {
4191 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4.
4192 CheckForConstantInitializer(Init, DclT);
4195 } else if (VDecl->isStaticDataMember() &&
4196 VDecl->getLexicalDeclContext()->isRecord()) {
4197 // This is an in-class initialization for a static data member, e.g.,
4200 // static const int value = 17;
4203 // Attach the initializer
4204 VDecl->setInit(Init);
4206 // C++ [class.mem]p4:
4207 // A member-declarator can contain a constant-initializer only
4208 // if it declares a static member (9.4) of const integral or
4209 // const enumeration type, see 9.4.2.
4210 QualType T = VDecl->getType();
4211 if (!T->isDependentType() &&
4212 (!Context.getCanonicalType(T).isConstQualified() ||
4213 !T->isIntegralOrEnumerationType())) {
4214 Diag(VDecl->getLocation(), diag::err_member_initialization)
4215 << VDecl->getDeclName() << Init->getSourceRange();
4216 VDecl->setInvalidDecl();
4218 // C++ [class.static.data]p4:
4219 // If a static data member is of const integral or const
4220 // enumeration type, its declaration in the class definition
4221 // can specify a constant-initializer which shall be an
4222 // integral constant expression (5.19).
4223 if (!Init->isTypeDependent() &&
4224 !Init->getType()->isIntegralOrEnumerationType()) {
4225 // We have a non-dependent, non-integral or enumeration type.
4226 Diag(Init->getSourceRange().getBegin(),
4227 diag::err_in_class_initializer_non_integral_type)
4228 << Init->getType() << Init->getSourceRange();
4229 VDecl->setInvalidDecl();
4230 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) {
4231 // Check whether the expression is a constant expression.
4234 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) {
4235 Diag(Loc, diag::err_in_class_initializer_non_constant)
4236 << Init->getSourceRange();
4237 VDecl->setInvalidDecl();
4238 } else if (!VDecl->getType()->isDependentType())
4239 ImpCastExprToType(Init, VDecl->getType(), CK_IntegralCast);
4242 } else if (VDecl->isFileVarDecl()) {
4243 if (VDecl->getStorageClass() == SC_Extern &&
4244 (!getLangOptions().CPlusPlus ||
4245 !Context.getBaseElementType(VDecl->getType()).isConstQualified()))
4246 Diag(VDecl->getLocation(), diag::warn_extern_init);
4247 if (!VDecl->isInvalidDecl()) {
4248 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1);
4249 ExprResult Result = InitSeq.Perform(*this, Entity, Kind,
4250 MultiExprArg(*this, &Init, 1),
4252 if (Result.isInvalid()) {
4253 VDecl->setInvalidDecl();
4257 Init = Result.takeAs<Expr>();
4260 // C++ 3.6.2p2, allow dynamic initialization of static initializers.
4261 // Don't check invalid declarations to avoid emitting useless diagnostics.
4262 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) {
4263 // C99 6.7.8p4. All file scoped initializers need to be constant.
4264 CheckForConstantInitializer(Init, DclT);
4267 // If the type changed, it means we had an incomplete type that was
4268 // completed by the initializer. For example:
4269 // int ary[] = { 1, 3, 5 };
4270 // "ary" transitions from a VariableArrayType to a ConstantArrayType.
4271 if (!VDecl->isInvalidDecl() && (DclT != SavT)) {
4272 VDecl->setType(DclT);
4273 Init->setType(DclT);
4276 Init = MaybeCreateCXXExprWithTemporaries(Init);
4277 // Attach the initializer to the decl.
4278 VDecl->setInit(Init);
4280 if (getLangOptions().CPlusPlus) {
4281 if (!VDecl->isInvalidDecl() &&
4282 !VDecl->getDeclContext()->isDependentContext() &&
4283 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() &&
4284 !Init->isConstantInitializer(Context,
4285 VDecl->getType()->isReferenceType()))
4286 Diag(VDecl->getLocation(), diag::warn_global_constructor)
4287 << Init->getSourceRange();
4289 // Make sure we mark the destructor as used if necessary.
4290 QualType InitType = VDecl->getType();
4291 while (const ArrayType *Array = Context.getAsArrayType(InitType))
4292 InitType = Context.getBaseElementType(Array);
4293 if (const RecordType *Record = InitType->getAs<RecordType>())
4294 FinalizeVarWithDestructor(VDecl, Record);
4300 /// ActOnInitializerError - Given that there was an error parsing an
4301 /// initializer for the given declaration, try to return to some form
4303 void Sema::ActOnInitializerError(Decl *D) {
4304 // Our main concern here is re-establishing invariants like "a
4305 // variable's type is either dependent or complete".
4306 if (!D || D->isInvalidDecl()) return;
4308 VarDecl *VD = dyn_cast<VarDecl>(D);
4311 QualType Ty = VD->getType();
4312 if (Ty->isDependentType()) return;
4314 // Require a complete type.
4315 if (RequireCompleteType(VD->getLocation(),
4316 Context.getBaseElementType(Ty),
4317 diag::err_typecheck_decl_incomplete_type)) {
4318 VD->setInvalidDecl();
4322 // Require an abstract type.
4323 if (RequireNonAbstractType(VD->getLocation(), Ty,
4324 diag::err_abstract_type_in_decl,
4325 AbstractVariableType)) {
4326 VD->setInvalidDecl();
4330 // Don't bother complaining about constructors or destructors,
4334 void Sema::ActOnUninitializedDecl(Decl *RealDecl,
4335 bool TypeContainsUndeducedAuto) {
4336 // If there is no declaration, there was an error parsing it. Just ignore it.
4340 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) {
4341 QualType Type = Var->getType();
4343 // C++0x [dcl.spec.auto]p3
4344 if (TypeContainsUndeducedAuto) {
4345 Diag(Var->getLocation(), diag::err_auto_var_requires_init)
4346 << Var->getDeclName() << Type;
4347 Var->setInvalidDecl();
4351 switch (Var->isThisDeclarationADefinition()) {
4352 case VarDecl::Definition:
4353 if (!Var->isStaticDataMember() || !Var->getAnyInitializer())
4356 // We have an out-of-line definition of a static data member
4357 // that has an in-class initializer, so we type-check this like
4362 case VarDecl::DeclarationOnly:
4363 // It's only a declaration.
4365 // Block scope. C99 6.7p7: If an identifier for an object is
4366 // declared with no linkage (C99 6.2.2p6), the type for the
4367 // object shall be complete.
4368 if (!Type->isDependentType() && Var->isBlockVarDecl() &&
4369 !Var->getLinkage() && !Var->isInvalidDecl() &&
4370 RequireCompleteType(Var->getLocation(), Type,
4371 diag::err_typecheck_decl_incomplete_type))
4372 Var->setInvalidDecl();
4374 // Make sure that the type is not abstract.
4375 if (!Type->isDependentType() && !Var->isInvalidDecl() &&
4376 RequireNonAbstractType(Var->getLocation(), Type,
4377 diag::err_abstract_type_in_decl,
4378 AbstractVariableType))
4379 Var->setInvalidDecl();
4382 case VarDecl::TentativeDefinition:
4383 // File scope. C99 6.9.2p2: A declaration of an identifier for an
4384 // object that has file scope without an initializer, and without a
4385 // storage-class specifier or with the storage-class specifier "static",
4386 // constitutes a tentative definition. Note: A tentative definition with
4387 // external linkage is valid (C99 6.2.2p5).
4388 if (!Var->isInvalidDecl()) {
4389 if (const IncompleteArrayType *ArrayT
4390 = Context.getAsIncompleteArrayType(Type)) {
4391 if (RequireCompleteType(Var->getLocation(),
4392 ArrayT->getElementType(),
4393 diag::err_illegal_decl_array_incomplete_type))
4394 Var->setInvalidDecl();
4395 } else if (Var->getStorageClass() == SC_Static) {
4396 // C99 6.9.2p3: If the declaration of an identifier for an object is
4397 // a tentative definition and has internal linkage (C99 6.2.2p3), the
4398 // declared type shall not be an incomplete type.
4399 // NOTE: code such as the following
4401 // struct s { int a; };
4402 // is accepted by gcc. Hence here we issue a warning instead of
4403 // an error and we do not invalidate the static declaration.
4404 // NOTE: to avoid multiple warnings, only check the first declaration.
4405 if (Var->getPreviousDeclaration() == 0)
4406 RequireCompleteType(Var->getLocation(), Type,
4407 diag::ext_typecheck_decl_incomplete_type);
4411 // Record the tentative definition; we're done.
4412 if (!Var->isInvalidDecl())
4413 TentativeDefinitions.push_back(Var);
4417 // Provide a specific diagnostic for uninitialized variable
4418 // definitions with incomplete array type.
4419 if (Type->isIncompleteArrayType()) {
4420 Diag(Var->getLocation(),
4421 diag::err_typecheck_incomplete_array_needs_initializer);
4422 Var->setInvalidDecl();
4426 // Provide a specific diagnostic for uninitialized variable
4427 // definitions with reference type.
4428 if (Type->isReferenceType()) {
4429 Diag(Var->getLocation(), diag::err_reference_var_requires_init)
4430 << Var->getDeclName()
4431 << SourceRange(Var->getLocation(), Var->getLocation());
4432 Var->setInvalidDecl();
4436 // Do not attempt to type-check the default initializer for a
4437 // variable with dependent type.
4438 if (Type->isDependentType())
4441 if (Var->isInvalidDecl())
4444 if (RequireCompleteType(Var->getLocation(),
4445 Context.getBaseElementType(Type),
4446 diag::err_typecheck_decl_incomplete_type)) {
4447 Var->setInvalidDecl();
4451 // The variable can not have an abstract class type.
4452 if (RequireNonAbstractType(Var->getLocation(), Type,
4453 diag::err_abstract_type_in_decl,
4454 AbstractVariableType)) {
4455 Var->setInvalidDecl();
4459 const RecordType *Record
4460 = Context.getBaseElementType(Type)->getAs<RecordType>();
4461 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x &&
4462 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) {
4463 // C++03 [dcl.init]p9:
4464 // If no initializer is specified for an object, and the
4465 // object is of (possibly cv-qualified) non-POD class type (or
4466 // array thereof), the object shall be default-initialized; if
4467 // the object is of const-qualified type, the underlying class
4468 // type shall have a user-declared default
4469 // constructor. Otherwise, if no initializer is specified for
4470 // a non- static object, the object and its subobjects, if
4471 // any, have an indeterminate initial value); if the object
4472 // or any of its subobjects are of const-qualified type, the
4473 // program is ill-formed.
4474 // FIXME: DPG thinks it is very fishy that C++0x disables this.
4476 // Check for jumps past the implicit initializer. C++0x
4477 // clarifies that this applies to a "variable with automatic
4478 // storage duration", not a "local variable".
4479 if (getLangOptions().CPlusPlus && Var->hasLocalStorage())
4480 getCurFunction()->setHasBranchProtectedScope();
4482 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var);
4483 InitializationKind Kind
4484 = InitializationKind::CreateDefault(Var->getLocation());
4486 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0);
4487 ExprResult Init = InitSeq.Perform(*this, Entity, Kind,
4488 MultiExprArg(*this, 0, 0));
4489 if (Init.isInvalid())
4490 Var->setInvalidDecl();
4491 else if (Init.get()) {
4492 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>()));
4494 if (getLangOptions().CPlusPlus && !Var->isInvalidDecl() &&
4495 Var->hasGlobalStorage() && !Var->isStaticLocal() &&
4496 !Var->getDeclContext()->isDependentContext() &&
4497 !Var->getInit()->isConstantInitializer(Context, false))
4498 Diag(Var->getLocation(), diag::warn_global_constructor);
4502 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record)
4503 FinalizeVarWithDestructor(Var, Record);
4507 Sema::DeclGroupPtrTy
4508 Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS,
4509 Decl **Group, unsigned NumDecls) {
4510 llvm::SmallVector<Decl*, 8> Decls;
4512 if (DS.isTypeSpecOwned())
4513 Decls.push_back(DS.getRepAsDecl());
4515 for (unsigned i = 0; i != NumDecls; ++i)
4516 if (Decl *D = Group[i])
4519 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context,
4520 Decls.data(), Decls.size()));
4524 /// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator()
4525 /// to introduce parameters into function prototype scope.
4526 Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) {
4527 const DeclSpec &DS = D.getDeclSpec();
4529 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'.
4530 VarDecl::StorageClass StorageClass = SC_None;
4531 VarDecl::StorageClass StorageClassAsWritten = SC_None;
4532 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) {
4533 StorageClass = SC_Register;
4534 StorageClassAsWritten = SC_Register;
4535 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) {
4536 Diag(DS.getStorageClassSpecLoc(),
4537 diag::err_invalid_storage_class_in_func_decl);
4538 D.getMutableDeclSpec().ClearStorageClassSpecs();
4541 if (D.getDeclSpec().isThreadSpecified())
4542 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
4544 DiagnoseFunctionSpecifiers(D);
4546 // Check that there are no default arguments inside the type of this
4547 // parameter (C++ only).
4548 if (getLangOptions().CPlusPlus)
4549 CheckExtraCXXDefaultArguments(D);
4551 TagDecl *OwnedDecl = 0;
4552 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl);
4553 QualType parmDeclType = TInfo->getType();
4555 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) {
4557 // Types shall not be defined in return or parameter types.
4558 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type)
4559 << Context.getTypeDeclType(OwnedDecl);
4562 // Check for redeclaration of parameters, e.g. int foo(int x, int x);
4563 IdentifierInfo *II = D.getIdentifier();
4565 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName,
4568 if (R.isSingleResult()) {
4569 NamedDecl *PrevDecl = R.getFoundDecl();
4570 if (PrevDecl->isTemplateParameter()) {
4571 // Maybe we will complain about the shadowed template parameter.
4572 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
4573 // Just pretend that we didn't see the previous declaration.
4575 } else if (S->isDeclScope(PrevDecl)) {
4576 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II;
4577 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
4579 // Recover by removing the name
4581 D.SetIdentifier(0, D.getIdentifierLoc());
4582 D.setInvalidType(true);
4587 // Temporarily put parameter variables in the translation unit, not
4588 // the enclosing context. This prevents them from accidentally
4589 // looking like class members in C++.
4590 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(),
4591 TInfo, parmDeclType, II,
4592 D.getIdentifierLoc(),
4593 StorageClass, StorageClassAsWritten);
4595 if (D.isInvalidType())
4596 New->setInvalidDecl();
4598 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1).
4599 if (D.getCXXScopeSpec().isSet()) {
4600 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator)
4601 << D.getCXXScopeSpec().getRange();
4602 New->setInvalidDecl();
4605 // Add the parameter declaration into this scope.
4608 IdResolver.AddDecl(New);
4610 ProcessDeclAttributes(S, New, D);
4612 if (New->hasAttr<BlocksAttr>()) {
4613 Diag(New->getLocation(), diag::err_block_on_nonlocal);
4618 /// \brief Synthesizes a variable for a parameter arising from a
4620 ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC,
4623 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, 0,
4624 T, Context.getTrivialTypeSourceInfo(T, Loc),
4625 SC_None, SC_None, 0);
4626 Param->setImplicit();
4630 void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param,
4631 ParmVarDecl * const *ParamEnd) {
4632 if (Diags.getDiagnosticLevel(diag::warn_unused_parameter) ==
4633 Diagnostic::Ignored)
4636 // Don't diagnose unused-parameter errors in template instantiations; we
4637 // will already have done so in the template itself.
4638 if (!ActiveTemplateInstantiations.empty())
4641 for (; Param != ParamEnd; ++Param) {
4642 if (!(*Param)->isUsed() && (*Param)->getDeclName() &&
4643 !(*Param)->hasAttr<UnusedAttr>()) {
4644 Diag((*Param)->getLocation(), diag::warn_unused_parameter)
4645 << (*Param)->getDeclName();
4650 ParmVarDecl *Sema::CheckParameter(DeclContext *DC,
4651 TypeSourceInfo *TSInfo, QualType T,
4652 IdentifierInfo *Name,
4653 SourceLocation NameLoc,
4654 VarDecl::StorageClass StorageClass,
4655 VarDecl::StorageClass StorageClassAsWritten) {
4656 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, NameLoc, Name,
4657 adjustParameterType(T), TSInfo,
4658 StorageClass, StorageClassAsWritten,
4661 // Parameters can not be abstract class types.
4662 // For record types, this is done by the AbstractClassUsageDiagnoser once
4663 // the class has been completely parsed.
4664 if (!CurContext->isRecord() &&
4665 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl,
4667 New->setInvalidDecl();
4669 // Parameter declarators cannot be interface types. All ObjC objects are
4670 // passed by reference.
4671 if (T->isObjCObjectType()) {
4673 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T;
4674 New->setInvalidDecl();
4677 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage
4678 // duration shall not be qualified by an address-space qualifier."
4679 // Since all parameters have automatic store duration, they can not have
4680 // an address space.
4681 if (T.getAddressSpace() != 0) {
4682 Diag(NameLoc, diag::err_arg_with_address_space);
4683 New->setInvalidDecl();
4689 void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D,
4690 SourceLocation LocAfterDecls) {
4691 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function &&
4692 "Not a function declarator!");
4693 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
4695 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared'
4696 // for a K&R function.
4697 if (!FTI.hasPrototype) {
4698 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) {
4700 if (FTI.ArgInfo[i].Param == 0) {
4701 llvm::SmallString<256> Code;
4702 llvm::raw_svector_ostream(Code) << " int "
4703 << FTI.ArgInfo[i].Ident->getName()
4705 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared)
4706 << FTI.ArgInfo[i].Ident
4707 << FixItHint::CreateInsertion(LocAfterDecls, Code.str());
4709 // Implicitly declare the argument as type 'int' for lack of a better
4712 const char* PrevSpec; // unused
4713 unsigned DiagID; // unused
4714 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc,
4716 Declarator ParamD(DS, Declarator::KNRTypeListContext);
4717 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc);
4718 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD);
4724 Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope,
4726 assert(getCurFunctionDecl() == 0 && "Function parsing confused");
4727 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function &&
4728 "Not a function declarator!");
4729 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun;
4731 if (FTI.hasPrototype) {
4732 // FIXME: Diagnose arguments without names in C.
4735 Scope *ParentScope = FnBodyScope->getParent();
4737 Decl *DP = HandleDeclarator(ParentScope, D,
4738 MultiTemplateParamsArg(*this),
4739 /*IsFunctionDefinition=*/true);
4740 return ActOnStartOfFunctionDef(FnBodyScope, DP);
4743 static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) {
4744 // Don't warn about invalid declarations.
4745 if (FD->isInvalidDecl())
4748 // Or declarations that aren't global.
4749 if (!FD->isGlobal())
4752 // Don't warn about C++ member functions.
4753 if (isa<CXXMethodDecl>(FD))
4756 // Don't warn about 'main'.
4760 // Don't warn about inline functions.
4761 if (FD->isInlineSpecified())
4764 // Don't warn about function templates.
4765 if (FD->getDescribedFunctionTemplate())
4768 // Don't warn about function template specializations.
4769 if (FD->isFunctionTemplateSpecialization())
4772 bool MissingPrototype = true;
4773 for (const FunctionDecl *Prev = FD->getPreviousDeclaration();
4774 Prev; Prev = Prev->getPreviousDeclaration()) {
4775 // Ignore any declarations that occur in function or method
4776 // scope, because they aren't visible from the header.
4777 if (Prev->getDeclContext()->isFunctionOrMethod())
4780 MissingPrototype = !Prev->getType()->isFunctionProtoType();
4784 return MissingPrototype;
4787 Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) {
4788 // Clear the last template instantiation error context.
4789 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation();
4793 FunctionDecl *FD = 0;
4795 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D))
4796 FD = FunTmpl->getTemplatedDecl();
4798 FD = cast<FunctionDecl>(D);
4800 // Enter a new function scope
4801 PushFunctionScope();
4803 // See if this is a redefinition.
4804 // But don't complain if we're in GNU89 mode and the previous definition
4805 // was an extern inline function.
4806 const FunctionDecl *Definition;
4807 if (FD->hasBody(Definition) &&
4808 !canRedefineFunction(Definition, getLangOptions())) {
4809 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName();
4810 Diag(Definition->getLocation(), diag::note_previous_definition);
4813 // Builtin functions cannot be defined.
4814 if (unsigned BuiltinID = FD->getBuiltinID()) {
4815 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) {
4816 Diag(FD->getLocation(), diag::err_builtin_definition) << FD;
4817 FD->setInvalidDecl();
4821 // The return type of a function definition must be complete
4822 // (C99 6.9.1p3, C++ [dcl.fct]p6).
4823 QualType ResultType = FD->getResultType();
4824 if (!ResultType->isDependentType() && !ResultType->isVoidType() &&
4825 !FD->isInvalidDecl() &&
4826 RequireCompleteType(FD->getLocation(), ResultType,
4827 diag::err_func_def_incomplete_result))
4828 FD->setInvalidDecl();
4830 // GNU warning -Wmissing-prototypes:
4831 // Warn if a global function is defined without a previous
4832 // prototype declaration. This warning is issued even if the
4833 // definition itself provides a prototype. The aim is to detect
4834 // global functions that fail to be declared in header files.
4835 if (ShouldWarnAboutMissingPrototype(FD))
4836 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD;
4839 PushDeclContext(FnBodyScope, FD);
4841 // Check the validity of our function parameters
4842 CheckParmsForFunctionDef(FD);
4844 bool ShouldCheckShadow =
4845 Diags.getDiagnosticLevel(diag::warn_decl_shadow) != Diagnostic::Ignored;
4847 // Introduce our parameters into the function scope
4848 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) {
4849 ParmVarDecl *Param = FD->getParamDecl(p);
4850 Param->setOwningFunction(FD);
4852 // If this has an identifier, add it to the scope stack.
4853 if (Param->getIdentifier() && FnBodyScope) {
4854 if (ShouldCheckShadow)
4855 CheckShadow(FnBodyScope, Param);
4857 PushOnScopeChains(Param, FnBodyScope);
4861 // Checking attributes of current function definition
4862 // dllimport attribute.
4863 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>();
4864 if (DA && (!FD->getAttr<DLLExportAttr>())) {
4865 // dllimport attribute cannot be directly applied to definition.
4866 if (!DA->isInherited()) {
4867 Diag(FD->getLocation(),
4868 diag::err_attribute_can_be_applied_only_to_symbol_declaration)
4870 FD->setInvalidDecl();
4874 // Visual C++ appears to not think this is an issue, so only issue
4875 // a warning when Microsoft extensions are disabled.
4876 if (!LangOpts.Microsoft) {
4877 // If a symbol previously declared dllimport is later defined, the
4878 // attribute is ignored in subsequent references, and a warning is
4880 Diag(FD->getLocation(),
4881 diag::warn_redeclaration_without_attribute_prev_attribute_ignored)
4882 << FD->getName() << "dllimport";
4888 /// \brief Given the set of return statements within a function body,
4889 /// compute the variables that are subject to the named return value
4892 /// Each of the variables that is subject to the named return value
4893 /// optimization will be marked as NRVO variables in the AST, and any
4894 /// return statement that has a marked NRVO variable as its NRVO candidate can
4895 /// use the named return value optimization.
4897 /// This function applies a very simplistic algorithm for NRVO: if every return
4898 /// statement in the function has the same NRVO candidate, that candidate is
4899 /// the NRVO variable.
4901 /// FIXME: Employ a smarter algorithm that accounts for multiple return
4902 /// statements and the lifetimes of the NRVO candidates. We should be able to
4903 /// find a maximal set of NRVO variables.
4904 static void ComputeNRVO(Stmt *Body, FunctionScopeInfo *Scope) {
4905 ReturnStmt **Returns = Scope->Returns.data();
4907 const VarDecl *NRVOCandidate = 0;
4908 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) {
4909 if (!Returns[I]->getNRVOCandidate())
4913 NRVOCandidate = Returns[I]->getNRVOCandidate();
4914 else if (NRVOCandidate != Returns[I]->getNRVOCandidate())
4919 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true);
4922 Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) {
4923 return ActOnFinishFunctionBody(D, move(BodyArg), false);
4926 Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body,
4927 bool IsInstantiation) {
4928 FunctionDecl *FD = 0;
4929 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl);
4931 FD = FunTmpl->getTemplatedDecl();
4933 FD = dyn_cast_or_null<FunctionDecl>(dcl);
4935 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy();
4940 // C and C++ allow for main to automagically return 0.
4941 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3.
4942 FD->setHasImplicitReturnZero(true);
4943 WP.disableCheckFallThrough();
4946 if (!FD->isInvalidDecl()) {
4947 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end());
4949 // If this is a constructor, we need a vtable.
4950 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD))
4951 MarkVTableUsed(FD->getLocation(), Constructor->getParent());
4953 ComputeNRVO(Body, getCurFunction());
4956 assert(FD == getCurFunctionDecl() && "Function parsing confused");
4957 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) {
4958 assert(MD == getCurMethodDecl() && "Method parsing confused");
4960 MD->setEndLoc(Body->getLocEnd());
4961 if (!MD->isInvalidDecl())
4962 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end());
4967 // Verify and clean out per-function state.
4969 // Check goto/label use.
4970 FunctionScopeInfo *CurFn = getCurFunction();
4971 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator
4972 I = CurFn->LabelMap.begin(), E = CurFn->LabelMap.end(); I != E; ++I) {
4973 LabelStmt *L = I->second;
4975 // Verify that we have no forward references left. If so, there was a goto
4976 // or address of a label taken, but no definition of it. Label fwd
4977 // definitions are indicated with a null substmt.
4978 if (L->getSubStmt() != 0)
4982 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName();
4984 // At this point, we have gotos that use the bogus label. Stitch it into
4985 // the function body so that they aren't leaked and that the AST is well
4988 // The whole function wasn't parsed correctly.
4992 // Otherwise, the body is valid: we want to stitch the label decl into the
4993 // function somewhere so that it is properly owned and so that the goto
4994 // has a valid target. Do this by creating a new compound stmt with the
4997 // Give the label a sub-statement.
4998 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc()));
5000 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ?
5001 cast<CXXTryStmt>(Body)->getTryBlock() :
5002 cast<CompoundStmt>(Body);
5003 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(),
5004 Compound->body_end());
5005 Elements.push_back(L);
5006 Compound->setStmts(Context, Elements.data(), Elements.size());
5010 // C++ constructors that have function-try-blocks can't have return
5011 // statements in the handlers of that block. (C++ [except.handle]p14)
5013 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body))
5014 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body));
5016 // Verify that that gotos and switch cases don't jump into scopes illegally.
5017 // Verify that that gotos and switch cases don't jump into scopes illegally.
5018 if (getCurFunction()->NeedsScopeChecking() &&
5019 !dcl->isInvalidDecl() &&
5020 !hasAnyErrorsInThisFunction())
5021 DiagnoseInvalidJumps(Body);
5023 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) {
5024 if (!Destructor->getParent()->isDependentType())
5025 CheckDestructor(Destructor);
5027 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(),
5028 Destructor->getParent());
5031 // If any errors have occurred, clear out any temporaries that may have
5032 // been leftover. This ensures that these temporaries won't be picked up for
5033 // deletion in some later function.
5034 if (PP.getDiagnostics().hasErrorOccurred())
5035 ExprTemporaries.clear();
5036 else if (!isa<FunctionTemplateDecl>(dcl)) {
5037 // Since the body is valid, issue any analysis-based warnings that are
5039 QualType ResultType;
5040 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) {
5041 AnalysisWarnings.IssueWarnings(WP, FD);
5043 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl);
5044 AnalysisWarnings.IssueWarnings(WP, MD);
5048 assert(ExprTemporaries.empty() && "Leftover temporaries in function");
5051 if (!IsInstantiation)
5054 PopFunctionOrBlockScope();
5056 // If any errors have occurred, clear out any temporaries that may have
5057 // been leftover. This ensures that these temporaries won't be picked up for
5058 // deletion in some later function.
5059 if (getDiagnostics().hasErrorOccurred())
5060 ExprTemporaries.clear();
5065 /// ImplicitlyDefineFunction - An undeclared identifier was used in a function
5066 /// call, forming a call to an implicitly defined function (per C99 6.5.1p2).
5067 NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc,
5068 IdentifierInfo &II, Scope *S) {
5069 // Before we produce a declaration for an implicitly defined
5070 // function, see whether there was a locally-scoped declaration of
5071 // this name as a function or variable. If so, use that
5072 // (non-visible) declaration, and complain about it.
5073 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
5074 = LocallyScopedExternalDecls.find(&II);
5075 if (Pos != LocallyScopedExternalDecls.end()) {
5076 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second;
5077 Diag(Pos->second->getLocation(), diag::note_previous_declaration);
5081 // Extension in C99. Legal in C90, but warn about it.
5082 if (II.getName().startswith("__builtin_"))
5083 Diag(Loc, diag::warn_builtin_unknown) << &II;
5084 else if (getLangOptions().C99)
5085 Diag(Loc, diag::ext_implicit_function_decl) << &II;
5087 Diag(Loc, diag::warn_implicit_function_decl) << &II;
5089 // Set a Declarator for the implicit definition: int foo();
5093 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID);
5094 Error = Error; // Silence warning.
5095 assert(!Error && "Error setting up implicit decl!");
5096 Declarator D(DS, Declarator::BlockContext);
5097 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0,
5098 0, 0, false, SourceLocation(),
5099 false, 0,0,0, Loc, Loc, D),
5101 D.SetIdentifier(&II, Loc);
5103 // Insert this function into translation-unit scope.
5105 DeclContext *PrevDC = CurContext;
5106 CurContext = Context.getTranslationUnitDecl();
5108 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D));
5111 CurContext = PrevDC;
5113 AddKnownFunctionAttributes(FD);
5118 /// \brief Adds any function attributes that we know a priori based on
5119 /// the declaration of this function.
5121 /// These attributes can apply both to implicitly-declared builtins
5122 /// (like __builtin___printf_chk) or to library-declared functions
5123 /// like NSLog or printf.
5124 void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) {
5125 if (FD->isInvalidDecl())
5128 // If this is a built-in function, map its builtin attributes to
5129 // actual attributes.
5130 if (unsigned BuiltinID = FD->getBuiltinID()) {
5131 // Handle printf-formatting attributes.
5134 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) {
5135 if (!FD->getAttr<FormatAttr>())
5136 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
5137 "printf", FormatIdx+1,
5138 HasVAListArg ? 0 : FormatIdx+2));
5140 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx,
5142 if (!FD->getAttr<FormatAttr>())
5143 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
5144 "scanf", FormatIdx+1,
5145 HasVAListArg ? 0 : FormatIdx+2));
5148 // Mark const if we don't care about errno and that is the only
5149 // thing preventing the function from being const. This allows
5150 // IRgen to use LLVM intrinsics for such functions.
5151 if (!getLangOptions().MathErrno &&
5152 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) {
5153 if (!FD->getAttr<ConstAttr>())
5154 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context));
5157 if (Context.BuiltinInfo.isNoReturn(BuiltinID))
5158 FD->setType(Context.getNoReturnType(FD->getType()));
5159 if (Context.BuiltinInfo.isNoThrow(BuiltinID))
5160 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context));
5161 if (Context.BuiltinInfo.isConst(BuiltinID))
5162 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context));
5165 IdentifierInfo *Name = FD->getIdentifier();
5168 if ((!getLangOptions().CPlusPlus &&
5169 FD->getDeclContext()->isTranslationUnit()) ||
5170 (isa<LinkageSpecDecl>(FD->getDeclContext()) &&
5171 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() ==
5172 LinkageSpecDecl::lang_c)) {
5173 // Okay: this could be a libc/libm/Objective-C function we know
5178 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) {
5179 // FIXME: NSLog and NSLogv should be target specific
5180 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) {
5181 // FIXME: We known better than our headers.
5182 const_cast<FormatAttr *>(Format)->setType(Context, "printf");
5184 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
5186 Name->isStr("NSLogv") ? 0 : 2));
5187 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) {
5188 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be
5189 // target-specific builtins, perhaps?
5190 if (!FD->getAttr<FormatAttr>())
5191 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
5193 Name->isStr("vasprintf") ? 0 : 3));
5197 TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
5198 TypeSourceInfo *TInfo) {
5199 assert(D.getIdentifier() && "Wrong callback for declspec without declarator");
5200 assert(!T.isNull() && "GetTypeForDeclarator() returned null type");
5203 assert(D.isInvalidType() && "no declarator info for valid type");
5204 TInfo = Context.getTrivialTypeSourceInfo(T);
5207 // Scope manipulation handled by caller.
5208 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext,
5209 D.getIdentifierLoc(),
5213 if (const TagType *TT = T->getAs<TagType>()) {
5214 TagDecl *TD = TT->getDecl();
5216 // If the TagDecl that the TypedefDecl points to is an anonymous decl
5217 // keep track of the TypedefDecl.
5218 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl())
5219 TD->setTypedefForAnonDecl(NewTD);
5222 if (D.isInvalidType())
5223 NewTD->setInvalidDecl();
5228 /// \brief Determine whether a tag with a given kind is acceptable
5229 /// as a redeclaration of the given tag declaration.
5231 /// \returns true if the new tag kind is acceptable, false otherwise.
5232 bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous,
5234 SourceLocation NewTagLoc,
5235 const IdentifierInfo &Name) {
5236 // C++ [dcl.type.elab]p3:
5237 // The class-key or enum keyword present in the
5238 // elaborated-type-specifier shall agree in kind with the
5239 // declaration to which the name in the elaborated-type-specifier
5240 // refers. This rule also applies to the form of
5241 // elaborated-type-specifier that declares a class-name or
5242 // friend class since it can be construed as referring to the
5243 // definition of the class. Thus, in any
5244 // elaborated-type-specifier, the enum keyword shall be used to
5245 // refer to an enumeration (7.2), the union class-key shall be
5246 // used to refer to a union (clause 9), and either the class or
5247 // struct class-key shall be used to refer to a class (clause 9)
5248 // declared using the class or struct class-key.
5249 TagTypeKind OldTag = Previous->getTagKind();
5250 if (OldTag == NewTag)
5253 if ((OldTag == TTK_Struct || OldTag == TTK_Class) &&
5254 (NewTag == TTK_Struct || NewTag == TTK_Class)) {
5255 // Warn about the struct/class tag mismatch.
5256 bool isTemplate = false;
5257 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous))
5258 isTemplate = Record->getDescribedClassTemplate();
5260 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch)
5261 << (NewTag == TTK_Class)
5262 << isTemplate << &Name
5263 << FixItHint::CreateReplacement(SourceRange(NewTagLoc),
5264 OldTag == TTK_Class? "class" : "struct");
5265 Diag(Previous->getLocation(), diag::note_previous_use);
5271 /// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the
5272 /// former case, Name will be non-null. In the later case, Name will be null.
5273 /// TagSpec indicates what kind of tag this is. TUK indicates whether this is a
5274 /// reference/declaration/definition of a tag.
5275 Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
5276 SourceLocation KWLoc, CXXScopeSpec &SS,
5277 IdentifierInfo *Name, SourceLocation NameLoc,
5278 AttributeList *Attr, AccessSpecifier AS,
5279 MultiTemplateParamsArg TemplateParameterLists,
5280 bool &OwnedDecl, bool &IsDependent) {
5281 // If this is not a definition, it must have a name.
5282 assert((Name != 0 || TUK == TUK_Definition) &&
5283 "Nameless record must be a definition!");
5286 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
5288 // FIXME: Check explicit specializations more carefully.
5289 bool isExplicitSpecialization = false;
5290 unsigned NumMatchedTemplateParamLists = TemplateParameterLists.size();
5291 bool Invalid = false;
5292 if (TUK != TUK_Reference) {
5293 if (TemplateParameterList *TemplateParams
5294 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS,
5295 (TemplateParameterList**)TemplateParameterLists.get(),
5296 TemplateParameterLists.size(),
5298 isExplicitSpecialization,
5300 // All but one template parameter lists have been matching.
5301 --NumMatchedTemplateParamLists;
5303 if (TemplateParams->size() > 0) {
5304 // This is a declaration or definition of a class template (which may
5305 // be a member of another template).
5310 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc,
5311 SS, Name, NameLoc, Attr,
5314 TemplateParameterLists.release();
5315 return Result.get();
5317 // The "template<>" header is extraneous.
5318 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams)
5319 << TypeWithKeyword::getTagTypeKindName(Kind) << Name;
5320 isExplicitSpecialization = true;
5325 DeclContext *SearchDC = CurContext;
5326 DeclContext *DC = CurContext;
5327 bool isStdBadAlloc = false;
5329 RedeclarationKind Redecl = ForRedeclaration;
5330 if (TUK == TUK_Friend || TUK == TUK_Reference)
5331 Redecl = NotForRedeclaration;
5333 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl);
5335 if (Name && SS.isNotEmpty()) {
5336 // We have a nested-name tag ('struct foo::bar').
5338 // Check for invalid 'foo::'.
5339 if (SS.isInvalid()) {
5344 // If this is a friend or a reference to a class in a dependent
5345 // context, don't try to make a decl for it.
5346 if (TUK == TUK_Friend || TUK == TUK_Reference) {
5347 DC = computeDeclContext(SS, false);
5353 DC = computeDeclContext(SS, true);
5355 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec)
5361 if (RequireCompleteDeclContext(SS, DC))
5365 // Look-up name inside 'foo::'.
5366 LookupQualifiedName(Previous, DC);
5368 if (Previous.isAmbiguous())
5371 if (Previous.empty()) {
5372 // Name lookup did not find anything. However, if the
5373 // nested-name-specifier refers to the current instantiation,
5374 // and that current instantiation has any dependent base
5375 // classes, we might find something at instantiation time: treat
5376 // this as a dependent elaborated-type-specifier.
5377 if (Previous.wasNotFoundInCurrentInstantiation()) {
5382 // A tag 'foo::bar' must already exist.
5383 Diag(NameLoc, diag::err_not_tag_in_scope)
5384 << Kind << Name << DC << SS.getRange();
5390 // If this is a named struct, check to see if there was a previous forward
5391 // declaration or definition.
5392 // FIXME: We're looking into outer scopes here, even when we
5393 // shouldn't be. Doing so can result in ambiguities that we
5394 // shouldn't be diagnosing.
5395 LookupName(Previous, S);
5397 // Note: there used to be some attempt at recovery here.
5398 if (Previous.isAmbiguous())
5401 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) {
5402 // FIXME: This makes sure that we ignore the contexts associated
5403 // with C structs, unions, and enums when looking for a matching
5404 // tag declaration or definition. See the similar lookup tweak
5405 // in Sema::LookupName; is there a better way to deal with this?
5406 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC))
5407 SearchDC = SearchDC->getParent();
5411 if (Previous.isSingleResult() &&
5412 Previous.getFoundDecl()->isTemplateParameter()) {
5413 // Maybe we will complain about the shadowed template parameter.
5414 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl());
5415 // Just pretend that we didn't see the previous declaration.
5419 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace &&
5420 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) {
5421 // This is a declaration of or a reference to "std::bad_alloc".
5422 isStdBadAlloc = true;
5424 if (Previous.empty() && StdBadAlloc) {
5425 // std::bad_alloc has been implicitly declared (but made invisible to
5426 // name lookup). Fill in this implicit declaration as the previous
5427 // declaration, so that the declarations get chained appropriately.
5428 Previous.addDecl(getStdBadAlloc());
5432 // If we didn't find a previous declaration, and this is a reference
5433 // (or friend reference), move to the correct scope. In C++, we
5434 // also need to do a redeclaration lookup there, just in case
5435 // there's a shadow friend decl.
5436 if (Name && Previous.empty() &&
5437 (TUK == TUK_Reference || TUK == TUK_Friend)) {
5438 if (Invalid) goto CreateNewDecl;
5439 assert(SS.isEmpty());
5441 if (TUK == TUK_Reference) {
5442 // C++ [basic.scope.pdecl]p5:
5443 // -- for an elaborated-type-specifier of the form
5445 // class-key identifier
5447 // if the elaborated-type-specifier is used in the
5448 // decl-specifier-seq or parameter-declaration-clause of a
5449 // function defined in namespace scope, the identifier is
5450 // declared as a class-name in the namespace that contains
5451 // the declaration; otherwise, except as a friend
5452 // declaration, the identifier is declared in the smallest
5453 // non-class, non-function-prototype scope that contains the
5456 // C99 6.7.2.3p8 has a similar (but not identical!) provision for
5457 // C structs and unions.
5459 // It is an error in C++ to declare (rather than define) an enum
5460 // type, including via an elaborated type specifier. We'll
5461 // diagnose that later; for now, declare the enum in the same
5462 // scope as we would have picked for any other tag type.
5464 // GNU C also supports this behavior as part of its incomplete
5465 // enum types extension, while GNU C++ does not.
5467 // Find the context where we'll be declaring the tag.
5468 // FIXME: We would like to maintain the current DeclContext as the
5470 while (SearchDC->isRecord())
5471 SearchDC = SearchDC->getParent();
5473 // Find the scope where we'll be declaring the tag.
5474 while (S->isClassScope() ||
5475 (getLangOptions().CPlusPlus &&
5476 S->isFunctionPrototypeScope()) ||
5477 ((S->getFlags() & Scope::DeclScope) == 0) ||
5479 ((DeclContext *)S->getEntity())->isTransparentContext()))
5482 assert(TUK == TUK_Friend);
5483 // C++ [namespace.memdef]p3:
5484 // If a friend declaration in a non-local class first declares a
5485 // class or function, the friend class or function is a member of
5486 // the innermost enclosing namespace.
5487 SearchDC = SearchDC->getEnclosingNamespaceContext();
5490 // In C++, we need to do a redeclaration lookup to properly
5491 // diagnose some problems.
5492 if (getLangOptions().CPlusPlus) {
5493 Previous.setRedeclarationKind(ForRedeclaration);
5494 LookupQualifiedName(Previous, SearchDC);
5498 if (!Previous.empty()) {
5499 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl();
5501 // It's okay to have a tag decl in the same scope as a typedef
5502 // which hides a tag decl in the same scope. Finding this
5503 // insanity with a redeclaration lookup can only actually happen
5506 // This is also okay for elaborated-type-specifiers, which is
5507 // technically forbidden by the current standard but which is
5508 // okay according to the likely resolution of an open issue;
5509 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407
5510 if (getLangOptions().CPlusPlus) {
5511 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(PrevDecl)) {
5512 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) {
5513 TagDecl *Tag = TT->getDecl();
5514 if (Tag->getDeclName() == Name &&
5515 Tag->getDeclContext()->getRedeclContext()
5516 ->Equals(TD->getDeclContext()->getRedeclContext())) {
5519 Previous.addDecl(Tag);
5520 Previous.resolveKind();
5526 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) {
5527 // If this is a use of a previous tag, or if the tag is already declared
5528 // in the same scope (so that the definition/declaration completes or
5529 // rementions the tag), reuse the decl.
5530 if (TUK == TUK_Reference || TUK == TUK_Friend ||
5531 isDeclInScope(PrevDecl, SearchDC, S)) {
5532 // Make sure that this wasn't declared as an enum and now used as a
5533 // struct or something similar.
5534 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) {
5536 = (PrevTagDecl->getTagKind() != TTK_Enum &&
5539 Diag(KWLoc, diag::err_use_with_wrong_tag)
5541 << FixItHint::CreateReplacement(SourceRange(KWLoc),
5542 PrevTagDecl->getKindName());
5544 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name;
5545 Diag(PrevTagDecl->getLocation(), diag::note_previous_use);
5548 Kind = PrevTagDecl->getTagKind();
5550 // Recover by making this an anonymous redefinition.
5558 // If this is a use, just return the declaration we found.
5560 // FIXME: In the future, return a variant or some other clue
5561 // for the consumer of this Decl to know it doesn't own it.
5562 // For our current ASTs this shouldn't be a problem, but will
5563 // need to be changed with DeclGroups.
5564 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) ||
5568 // Diagnose attempts to redefine a tag.
5569 if (TUK == TUK_Definition) {
5570 if (TagDecl *Def = PrevTagDecl->getDefinition()) {
5571 // If we're defining a specialization and the previous definition
5572 // is from an implicit instantiation, don't emit an error
5573 // here; we'll catch this in the general case below.
5574 if (!isExplicitSpecialization ||
5575 !isa<CXXRecordDecl>(Def) ||
5576 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind()
5577 == TSK_ExplicitSpecialization) {
5578 Diag(NameLoc, diag::err_redefinition) << Name;
5579 Diag(Def->getLocation(), diag::note_previous_definition);
5580 // If this is a redefinition, recover by making this
5581 // struct be anonymous, which will make any later
5582 // references get the previous definition.
5588 // If the type is currently being defined, complain
5589 // about a nested redefinition.
5590 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl));
5591 if (Tag->isBeingDefined()) {
5592 Diag(NameLoc, diag::err_nested_redefinition) << Name;
5593 Diag(PrevTagDecl->getLocation(),
5594 diag::note_previous_definition);
5601 // Okay, this is definition of a previously declared or referenced
5602 // tag PrevDecl. We're going to create a new Decl for it.
5605 // If we get here we have (another) forward declaration or we
5606 // have a definition. Just create a new decl.
5609 // If we get here, this is a definition of a new tag type in a nested
5610 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a
5611 // new decl/type. We set PrevDecl to NULL so that the entities
5612 // have distinct types.
5615 // If we get here, we're going to create a new Decl. If PrevDecl
5616 // is non-NULL, it's a definition of the tag declared by
5617 // PrevDecl. If it's NULL, we have a new definition.
5620 // Otherwise, PrevDecl is not a tag, but was found with tag
5621 // lookup. This is only actually possible in C++, where a few
5622 // things like templates still live in the tag namespace.
5624 assert(getLangOptions().CPlusPlus);
5626 // Use a better diagnostic if an elaborated-type-specifier
5627 // found the wrong kind of type on the first
5628 // (non-redeclaration) lookup.
5629 if ((TUK == TUK_Reference || TUK == TUK_Friend) &&
5630 !Previous.isForRedeclaration()) {
5632 if (isa<TypedefDecl>(PrevDecl)) Kind = 1;
5633 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2;
5634 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind;
5635 Diag(PrevDecl->getLocation(), diag::note_declared_at);
5638 // Otherwise, only diagnose if the declaration is in scope.
5639 } else if (!isDeclInScope(PrevDecl, SearchDC, S)) {
5642 // Diagnose implicit declarations introduced by elaborated types.
5643 } else if (TUK == TUK_Reference || TUK == TUK_Friend) {
5645 if (isa<TypedefDecl>(PrevDecl)) Kind = 1;
5646 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2;
5647 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind;
5648 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl;
5651 // Otherwise it's a declaration. Call out a particularly common
5653 } else if (isa<TypedefDecl>(PrevDecl)) {
5654 Diag(NameLoc, diag::err_tag_definition_of_typedef)
5656 << cast<TypedefDecl>(PrevDecl)->getUnderlyingType();
5657 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl;
5660 // Otherwise, diagnose.
5662 // The tag name clashes with something else in the target scope,
5663 // issue an error and recover by making this tag be anonymous.
5664 Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
5665 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
5670 // The existing declaration isn't relevant to us; we're in a
5671 // new scope, so clear out the previous declaration.
5678 TagDecl *PrevDecl = 0;
5679 if (Previous.isSingleResult())
5680 PrevDecl = cast<TagDecl>(Previous.getFoundDecl());
5682 // If there is an identifier, use the location of the identifier as the
5683 // location of the decl, otherwise use the location of the struct/union
5685 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc;
5687 // Otherwise, create a new declaration. If there is a previous
5688 // declaration of the same entity, the two will be linked via
5692 if (Kind == TTK_Enum) {
5693 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
5694 // enum X { A, B, C } D; D should chain to X.
5695 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc,
5696 cast_or_null<EnumDecl>(PrevDecl));
5697 // If this is an undefined enum, warn.
5698 if (TUK != TUK_Definition && !Invalid) {
5700 if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) {
5701 Diag(Loc, diag::ext_forward_ref_enum_def)
5703 Diag(Def->getLocation(), diag::note_previous_definition);
5706 getLangOptions().CPlusPlus? diag::err_forward_ref_enum
5707 : diag::ext_forward_ref_enum);
5711 // struct/union/class
5713 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
5714 // struct X { int A; } D; D should chain to X.
5715 if (getLangOptions().CPlusPlus) {
5716 // FIXME: Look for a way to use RecordDecl for simple structs.
5717 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc,
5718 cast_or_null<CXXRecordDecl>(PrevDecl));
5720 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit()))
5721 StdBadAlloc = cast<CXXRecordDecl>(New);
5723 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc,
5724 cast_or_null<RecordDecl>(PrevDecl));
5727 // Maybe add qualifier info.
5728 if (SS.isNotEmpty()) {
5730 NestedNameSpecifier *NNS
5731 = static_cast<NestedNameSpecifier*>(SS.getScopeRep());
5732 New->setQualifierInfo(NNS, SS.getRange());
5733 if (NumMatchedTemplateParamLists > 0) {
5734 New->setTemplateParameterListsInfo(Context,
5735 NumMatchedTemplateParamLists,
5736 (TemplateParameterList**) TemplateParameterLists.release());
5743 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) {
5744 // Add alignment attributes if necessary; these attributes are checked when
5745 // the ASTContext lays out the structure.
5747 // It is important for implementing the correct semantics that this
5748 // happen here (in act on tag decl). The #pragma pack stack is
5749 // maintained as a result of parser callbacks which can occur at
5750 // many points during the parsing of a struct declaration (because
5751 // the #pragma tokens are effectively skipped over during the
5752 // parsing of the struct).
5753 AddAlignmentAttributesForRecord(RD);
5756 // If this is a specialization of a member class (of a class template),
5757 // check the specialization.
5758 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous))
5762 New->setInvalidDecl();
5765 ProcessDeclAttributeList(S, New, Attr);
5767 // If we're declaring or defining a tag in function prototype scope
5768 // in C, note that this type can only be used within the function.
5769 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus)
5770 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New);
5772 // Set the lexical context. If the tag has a C++ scope specifier, the
5773 // lexical context will be different from the semantic context.
5774 New->setLexicalDeclContext(CurContext);
5776 // Mark this as a friend decl if applicable.
5777 if (TUK == TUK_Friend)
5778 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty());
5780 // Set the access specifier.
5781 if (!Invalid && SearchDC->isRecord())
5782 SetMemberAccessSpecifier(New, PrevDecl, AS);
5784 if (TUK == TUK_Definition)
5785 New->startDefinition();
5787 // If this has an identifier, add it to the scope stack.
5788 if (TUK == TUK_Friend) {
5789 // We might be replacing an existing declaration in the lookup tables;
5790 // if so, borrow its access specifier.
5792 New->setAccess(PrevDecl->getAccess());
5794 DeclContext *DC = New->getDeclContext()->getRedeclContext();
5795 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false);
5796 if (Name) // can be null along some error paths
5797 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
5798 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false);
5800 S = getNonFieldDeclScope(S);
5801 PushOnScopeChains(New, S);
5803 CurContext->addDecl(New);
5806 // If this is the C FILE type, notify the AST context.
5807 if (IdentifierInfo *II = New->getIdentifier())
5808 if (!New->isInvalidDecl() &&
5809 New->getDeclContext()->getRedeclContext()->isTranslationUnit() &&
5811 Context.setFILEDecl(New);
5817 void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) {
5818 AdjustDeclIfTemplate(TagD);
5819 TagDecl *Tag = cast<TagDecl>(TagD);
5821 // Enter the tag context.
5822 PushDeclContext(S, Tag);
5825 void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD,
5826 SourceLocation LBraceLoc) {
5827 AdjustDeclIfTemplate(TagD);
5828 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD);
5830 FieldCollector->StartClass();
5832 if (!Record->getIdentifier())
5836 // [...] The class-name is also inserted into the scope of the
5837 // class itself; this is known as the injected-class-name. For
5838 // purposes of access checking, the injected-class-name is treated
5839 // as if it were a public member name.
5840 CXXRecordDecl *InjectedClassName
5841 = CXXRecordDecl::Create(Context, Record->getTagKind(),
5842 CurContext, Record->getLocation(),
5843 Record->getIdentifier(),
5844 Record->getTagKeywordLoc(),
5846 InjectedClassName->setImplicit();
5847 InjectedClassName->setAccess(AS_public);
5848 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate())
5849 InjectedClassName->setDescribedClassTemplate(Template);
5850 PushOnScopeChains(InjectedClassName, S);
5851 assert(InjectedClassName->isInjectedClassName() &&
5852 "Broken injected-class-name");
5855 void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD,
5856 SourceLocation RBraceLoc) {
5857 AdjustDeclIfTemplate(TagD);
5858 TagDecl *Tag = cast<TagDecl>(TagD);
5859 Tag->setRBraceLoc(RBraceLoc);
5861 if (isa<CXXRecordDecl>(Tag))
5862 FieldCollector->FinishClass();
5864 // Exit this scope of this tag's definition.
5867 // Notify the consumer that we've defined a tag.
5868 Consumer.HandleTagDeclDefinition(Tag);
5871 void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) {
5872 AdjustDeclIfTemplate(TagD);
5873 TagDecl *Tag = cast<TagDecl>(TagD);
5874 Tag->setInvalidDecl();
5876 // We're undoing ActOnTagStartDefinition here, not
5877 // ActOnStartCXXMemberDeclarations, so we don't have to mess with
5878 // the FieldCollector.
5883 // Note that FieldName may be null for anonymous bitfields.
5884 bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName,
5885 QualType FieldTy, const Expr *BitWidth,
5887 // Default to true; that shouldn't confuse checks for emptiness
5891 // C99 6.7.2.1p4 - verify the field type.
5892 // C++ 9.6p3: A bit-field shall have integral or enumeration type.
5893 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) {
5894 // Handle incomplete types with specific error.
5895 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete))
5898 return Diag(FieldLoc, diag::err_not_integral_type_bitfield)
5899 << FieldName << FieldTy << BitWidth->getSourceRange();
5900 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield)
5901 << FieldTy << BitWidth->getSourceRange();
5904 // If the bit-width is type- or value-dependent, don't try to check
5906 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent())
5910 if (VerifyIntegerConstantExpression(BitWidth, &Value))
5913 if (Value != 0 && ZeroWidth)
5916 // Zero-width bitfield is ok for anonymous field.
5917 if (Value == 0 && FieldName)
5918 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName;
5920 if (Value.isSigned() && Value.isNegative()) {
5922 return Diag(FieldLoc, diag::err_bitfield_has_negative_width)
5923 << FieldName << Value.toString(10);
5924 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width)
5925 << Value.toString(10);
5928 if (!FieldTy->isDependentType()) {
5929 uint64_t TypeSize = Context.getTypeSize(FieldTy);
5930 if (Value.getZExtValue() > TypeSize) {
5931 if (!getLangOptions().CPlusPlus) {
5933 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size)
5934 << FieldName << (unsigned)Value.getZExtValue()
5935 << (unsigned)TypeSize;
5937 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size)
5938 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize;
5942 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size)
5943 << FieldName << (unsigned)Value.getZExtValue()
5944 << (unsigned)TypeSize;
5946 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size)
5947 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize;
5954 /// ActOnField - Each field of a struct/union/class is passed into this in order
5955 /// to create a FieldDecl object for it.
5956 Decl *Sema::ActOnField(Scope *S, Decl *TagD,
5957 SourceLocation DeclStart,
5958 Declarator &D, ExprTy *BitfieldWidth) {
5959 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD),
5960 DeclStart, D, static_cast<Expr*>(BitfieldWidth),
5965 /// HandleField - Analyze a field of a C struct or a C++ data member.
5967 FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record,
5968 SourceLocation DeclStart,
5969 Declarator &D, Expr *BitWidth,
5970 AccessSpecifier AS) {
5971 IdentifierInfo *II = D.getIdentifier();
5972 SourceLocation Loc = DeclStart;
5973 if (II) Loc = D.getIdentifierLoc();
5975 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
5976 QualType T = TInfo->getType();
5977 if (getLangOptions().CPlusPlus)
5978 CheckExtraCXXDefaultArguments(D);
5980 DiagnoseFunctionSpecifiers(D);
5982 if (D.getDeclSpec().isThreadSpecified())
5983 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
5985 // Check to see if this name was declared as a member previously
5986 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration);
5987 LookupName(Previous, S);
5988 assert((Previous.empty() || Previous.isOverloadedResult() ||
5989 Previous.isSingleResult())
5990 && "Lookup of member name should be either overloaded, single or null");
5992 // If the name is overloaded then get any declaration else get the single result
5993 NamedDecl *PrevDecl = Previous.isOverloadedResult() ?
5994 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>();
5996 if (PrevDecl && PrevDecl->isTemplateParameter()) {
5997 // Maybe we will complain about the shadowed template parameter.
5998 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
5999 // Just pretend that we didn't see the previous declaration.
6003 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S))
6007 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable);
6008 SourceLocation TSSL = D.getSourceRange().getBegin();
6010 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL,
6013 if (NewFD->isInvalidDecl())
6014 Record->setInvalidDecl();
6016 if (NewFD->isInvalidDecl() && PrevDecl) {
6017 // Don't introduce NewFD into scope; there's already something
6018 // with the same name in the same scope.
6020 PushOnScopeChains(NewFD, S);
6022 Record->addDecl(NewFD);
6027 /// \brief Build a new FieldDecl and check its well-formedness.
6029 /// This routine builds a new FieldDecl given the fields name, type,
6030 /// record, etc. \p PrevDecl should refer to any previous declaration
6031 /// with the same name and in the same scope as the field to be
6034 /// \returns a new FieldDecl.
6036 /// \todo The Declarator argument is a hack. It will be removed once
6037 FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T,
6038 TypeSourceInfo *TInfo,
6039 RecordDecl *Record, SourceLocation Loc,
6040 bool Mutable, Expr *BitWidth,
6041 SourceLocation TSSL,
6042 AccessSpecifier AS, NamedDecl *PrevDecl,
6044 IdentifierInfo *II = Name.getAsIdentifierInfo();
6045 bool InvalidDecl = false;
6046 if (D) InvalidDecl = D->isInvalidType();
6048 // If we receive a broken type, recover by assuming 'int' and
6049 // marking this declaration as invalid.
6055 QualType EltTy = Context.getBaseElementType(T);
6056 if (!EltTy->isDependentType() &&
6057 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) {
6058 // Fields of incomplete type force their record to be invalid.
6059 Record->setInvalidDecl();
6063 // C99 6.7.2.1p8: A member of a structure or union may have any type other
6064 // than a variably modified type.
6065 if (!InvalidDecl && T->isVariablyModifiedType()) {
6066 bool SizeIsNegative;
6067 llvm::APSInt Oversized;
6068 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context,
6071 if (!FixedTy.isNull()) {
6072 Diag(Loc, diag::warn_illegal_constant_array_size);
6076 Diag(Loc, diag::err_typecheck_negative_array_size);
6077 else if (Oversized.getBoolValue())
6078 Diag(Loc, diag::err_array_too_large)
6079 << Oversized.toString(10);
6081 Diag(Loc, diag::err_typecheck_field_variable_size);
6086 // Fields can not have abstract class types
6087 if (!InvalidDecl && RequireNonAbstractType(Loc, T,
6088 diag::err_abstract_type_in_decl,
6092 bool ZeroWidth = false;
6093 // If this is declared as a bit-field, check the bit-field.
6094 if (!InvalidDecl && BitWidth &&
6095 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) {
6101 // Check that 'mutable' is consistent with the type of the declaration.
6102 if (!InvalidDecl && Mutable) {
6103 unsigned DiagID = 0;
6104 if (T->isReferenceType())
6105 DiagID = diag::err_mutable_reference;
6106 else if (T.isConstQualified())
6107 DiagID = diag::err_mutable_const;
6110 SourceLocation ErrLoc = Loc;
6111 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid())
6112 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc();
6113 Diag(ErrLoc, DiagID);
6119 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo,
6122 NewFD->setInvalidDecl();
6124 if (PrevDecl && !isa<TagDecl>(PrevDecl)) {
6125 Diag(Loc, diag::err_duplicate_member) << II;
6126 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
6127 NewFD->setInvalidDecl();
6130 if (!InvalidDecl && getLangOptions().CPlusPlus) {
6131 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record);
6133 if (!T->isPODType())
6134 CXXRecord->setPOD(false);
6136 CXXRecord->setEmpty(false);
6137 if (T->isReferenceType())
6138 CXXRecord->setHasTrivialConstructor(false);
6140 if (const RecordType *RT = EltTy->getAs<RecordType>()) {
6141 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl());
6142 if (RDecl->getDefinition()) {
6143 if (!RDecl->hasTrivialConstructor())
6144 CXXRecord->setHasTrivialConstructor(false);
6145 if (!RDecl->hasTrivialCopyConstructor())
6146 CXXRecord->setHasTrivialCopyConstructor(false);
6147 if (!RDecl->hasTrivialCopyAssignment())
6148 CXXRecord->setHasTrivialCopyAssignment(false);
6149 if (!RDecl->hasTrivialDestructor())
6150 CXXRecord->setHasTrivialDestructor(false);
6152 // C++ 9.5p1: An object of a class with a non-trivial
6153 // constructor, a non-trivial copy constructor, a non-trivial
6154 // destructor, or a non-trivial copy assignment operator
6155 // cannot be a member of a union, nor can an array of such
6157 // TODO: C++0x alters this restriction significantly.
6158 if (Record->isUnion() && CheckNontrivialField(NewFD))
6159 NewFD->setInvalidDecl();
6164 // FIXME: We need to pass in the attributes given an AST
6165 // representation, not a parser representation.
6167 // FIXME: What to pass instead of TUScope?
6168 ProcessDeclAttributes(TUScope, NewFD, *D);
6170 if (T.isObjCGCWeak())
6171 Diag(Loc, diag::warn_attribute_weak_on_field);
6173 NewFD->setAccess(AS);
6175 // C++ [dcl.init.aggr]p1:
6176 // An aggregate is an array or a class (clause 9) with [...] no
6177 // private or protected non-static data members (clause 11).
6178 // A POD must be an aggregate.
6179 if (getLangOptions().CPlusPlus &&
6180 (AS == AS_private || AS == AS_protected)) {
6181 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record);
6182 CXXRecord->setAggregate(false);
6183 CXXRecord->setPOD(false);
6189 bool Sema::CheckNontrivialField(FieldDecl *FD) {
6191 assert(getLangOptions().CPlusPlus && "valid check only for C++");
6193 if (FD->isInvalidDecl())
6196 QualType EltTy = Context.getBaseElementType(FD->getType());
6197 if (const RecordType *RT = EltTy->getAs<RecordType>()) {
6198 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl());
6199 if (RDecl->getDefinition()) {
6200 // We check for copy constructors before constructors
6201 // because otherwise we'll never get complaints about
6202 // copy constructors.
6204 CXXSpecialMember member = CXXInvalid;
6205 if (!RDecl->hasTrivialCopyConstructor())
6206 member = CXXCopyConstructor;
6207 else if (!RDecl->hasTrivialConstructor())
6208 member = CXXConstructor;
6209 else if (!RDecl->hasTrivialCopyAssignment())
6210 member = CXXCopyAssignment;
6211 else if (!RDecl->hasTrivialDestructor())
6212 member = CXXDestructor;
6214 if (member != CXXInvalid) {
6215 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member)
6216 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member;
6217 DiagnoseNontrivial(RT, member);
6226 /// DiagnoseNontrivial - Given that a class has a non-trivial
6227 /// special member, figure out why.
6228 void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) {
6230 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl());
6232 // Check whether the member was user-declared.
6237 case CXXConstructor:
6238 if (RD->hasUserDeclaredConstructor()) {
6239 typedef CXXRecordDecl::ctor_iterator ctor_iter;
6240 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){
6241 const FunctionDecl *body = 0;
6243 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) {
6244 SourceLocation CtorLoc = ci->getLocation();
6245 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member;
6250 assert(0 && "found no user-declared constructors");
6255 case CXXCopyConstructor:
6256 if (RD->hasUserDeclaredCopyConstructor()) {
6257 SourceLocation CtorLoc =
6258 RD->getCopyConstructor(Context, 0)->getLocation();
6259 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member;
6264 case CXXCopyAssignment:
6265 if (RD->hasUserDeclaredCopyAssignment()) {
6266 // FIXME: this should use the location of the copy
6267 // assignment, not the type.
6268 SourceLocation TyLoc = RD->getSourceRange().getBegin();
6269 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member;
6275 if (RD->hasUserDeclaredDestructor()) {
6276 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation();
6277 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member;
6283 typedef CXXRecordDecl::base_class_iterator base_iter;
6285 // Virtual bases and members inhibit trivial copying/construction,
6286 // but not trivial destruction.
6287 if (member != CXXDestructor) {
6288 // Check for virtual bases. vbases includes indirect virtual bases,
6289 // so we just iterate through the direct bases.
6290 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi)
6291 if (bi->isVirtual()) {
6292 SourceLocation BaseLoc = bi->getSourceRange().getBegin();
6293 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1;
6297 // Check for virtual methods.
6298 typedef CXXRecordDecl::method_iterator meth_iter;
6299 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me;
6301 if (mi->isVirtual()) {
6302 SourceLocation MLoc = mi->getSourceRange().getBegin();
6303 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0;
6309 bool (CXXRecordDecl::*hasTrivial)() const;
6311 case CXXConstructor:
6312 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break;
6313 case CXXCopyConstructor:
6314 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break;
6315 case CXXCopyAssignment:
6316 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break;
6318 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break;
6320 assert(0 && "unexpected special member"); return;
6323 // Check for nontrivial bases (and recurse).
6324 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) {
6325 const RecordType *BaseRT = bi->getType()->getAs<RecordType>();
6326 assert(BaseRT && "Don't know how to handle dependent bases");
6327 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl());
6328 if (!(BaseRecTy->*hasTrivial)()) {
6329 SourceLocation BaseLoc = bi->getSourceRange().getBegin();
6330 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member;
6331 DiagnoseNontrivial(BaseRT, member);
6336 // Check for nontrivial members (and recurse).
6337 typedef RecordDecl::field_iterator field_iter;
6338 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe;
6340 QualType EltTy = Context.getBaseElementType((*fi)->getType());
6341 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) {
6342 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl());
6344 if (!(EltRD->*hasTrivial)()) {
6345 SourceLocation FLoc = (*fi)->getLocation();
6346 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member;
6347 DiagnoseNontrivial(EltRT, member);
6353 assert(0 && "found no explanation for non-trivial member");
6356 /// TranslateIvarVisibility - Translate visibility from a token ID to an
6358 static ObjCIvarDecl::AccessControl
6359 TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) {
6360 switch (ivarVisibility) {
6361 default: assert(0 && "Unknown visitibility kind");
6362 case tok::objc_private: return ObjCIvarDecl::Private;
6363 case tok::objc_public: return ObjCIvarDecl::Public;
6364 case tok::objc_protected: return ObjCIvarDecl::Protected;
6365 case tok::objc_package: return ObjCIvarDecl::Package;
6369 /// ActOnIvar - Each ivar field of an objective-c class is passed into this
6370 /// in order to create an IvarDecl object for it.
6371 Decl *Sema::ActOnIvar(Scope *S,
6372 SourceLocation DeclStart,
6374 Declarator &D, ExprTy *BitfieldWidth,
6375 tok::ObjCKeywordKind Visibility) {
6377 IdentifierInfo *II = D.getIdentifier();
6378 Expr *BitWidth = (Expr*)BitfieldWidth;
6379 SourceLocation Loc = DeclStart;
6380 if (II) Loc = D.getIdentifierLoc();
6382 // FIXME: Unnamed fields can be handled in various different ways, for
6383 // example, unnamed unions inject all members into the struct namespace!
6385 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
6386 QualType T = TInfo->getType();
6389 // 6.7.2.1p3, 6.7.2.1p4
6390 if (VerifyBitField(Loc, II, T, BitWidth)) {
6400 if (T->isReferenceType()) {
6401 Diag(Loc, diag::err_ivar_reference_type);
6404 // C99 6.7.2.1p8: A member of a structure or union may have any type other
6405 // than a variably modified type.
6406 else if (T->isVariablyModifiedType()) {
6407 Diag(Loc, diag::err_typecheck_ivar_variable_size);
6411 // Get the visibility (access control) for this ivar.
6412 ObjCIvarDecl::AccessControl ac =
6413 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility)
6414 : ObjCIvarDecl::None;
6415 // Must set ivar's DeclContext to its enclosing interface.
6416 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(IntfDecl);
6417 ObjCContainerDecl *EnclosingContext;
6418 if (ObjCImplementationDecl *IMPDecl =
6419 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
6420 if (!LangOpts.ObjCNonFragileABI2) {
6421 // Case of ivar declared in an implementation. Context is that of its class.
6422 EnclosingContext = IMPDecl->getClassInterface();
6423 assert(EnclosingContext && "Implementation has no class interface!");
6426 EnclosingContext = EnclosingDecl;
6428 if (ObjCCategoryDecl *CDecl =
6429 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
6430 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) {
6431 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension();
6435 EnclosingContext = EnclosingDecl;
6438 // Construct the decl.
6439 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context,
6440 EnclosingContext, Loc, II, T,
6441 TInfo, ac, (Expr *)BitfieldWidth);
6444 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName,
6446 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S)
6447 && !isa<TagDecl>(PrevDecl)) {
6448 Diag(Loc, diag::err_duplicate_member) << II;
6449 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
6450 NewID->setInvalidDecl();
6454 // Process attributes attached to the ivar.
6455 ProcessDeclAttributes(S, NewID, D);
6457 if (D.isInvalidType())
6458 NewID->setInvalidDecl();
6461 // FIXME: When interfaces are DeclContexts, we'll need to add
6462 // these to the interface.
6464 IdResolver.AddDecl(NewID);
6470 /// ActOnLastBitfield - This routine handles synthesized bitfields rules for
6471 /// class and class extensions. For every class @interface and class
6472 /// extension @interface, if the last ivar is a bitfield of any type,
6473 /// then add an implicit `char :0` ivar to the end of that interface.
6474 void Sema::ActOnLastBitfield(SourceLocation DeclLoc, Decl *EnclosingDecl,
6475 llvm::SmallVectorImpl<Decl *> &AllIvarDecls) {
6476 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty())
6479 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1];
6480 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl);
6482 if (!Ivar->isBitField())
6484 uint64_t BitFieldSize =
6485 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue();
6486 if (BitFieldSize == 0)
6488 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl);
6490 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
6491 if (!CD->IsClassExtension())
6494 // No need to add this to end of @implementation.
6498 // All conditions are met. Add a new bitfield to the tail end of ivars.
6499 llvm::APInt Zero(Context.getTypeSize(Context.CharTy), 0);
6500 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.CharTy, DeclLoc);
6502 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(EnclosingDecl),
6505 Context.CreateTypeSourceInfo(Context.CharTy),
6506 ObjCIvarDecl::Private, BW,
6508 AllIvarDecls.push_back(Ivar);
6511 void Sema::ActOnFields(Scope* S,
6512 SourceLocation RecLoc, Decl *EnclosingDecl,
6513 Decl **Fields, unsigned NumFields,
6514 SourceLocation LBrac, SourceLocation RBrac,
6515 AttributeList *Attr) {
6516 assert(EnclosingDecl && "missing record or interface decl");
6518 // If the decl this is being inserted into is invalid, then it may be a
6519 // redeclaration or some other bogus case. Don't try to add fields to it.
6520 if (EnclosingDecl->isInvalidDecl()) {
6521 // FIXME: Deallocate fields?
6526 // Verify that all the fields are okay.
6527 unsigned NumNamedMembers = 0;
6528 llvm::SmallVector<FieldDecl*, 32> RecFields;
6530 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl);
6531 for (unsigned i = 0; i != NumFields; ++i) {
6532 FieldDecl *FD = cast<FieldDecl>(Fields[i]);
6534 // Get the type for the field.
6535 Type *FDTy = FD->getType().getTypePtr();
6537 if (!FD->isAnonymousStructOrUnion()) {
6538 // Remember all fields written by the user.
6539 RecFields.push_back(FD);
6542 // If the field is already invalid for some reason, don't emit more
6543 // diagnostics about it.
6544 if (FD->isInvalidDecl()) {
6545 EnclosingDecl->setInvalidDecl();
6550 // A structure or union shall not contain a member with
6551 // incomplete or function type (hence, a structure shall not
6552 // contain an instance of itself, but may contain a pointer to
6553 // an instance of itself), except that the last member of a
6554 // structure with more than one named member may have incomplete
6555 // array type; such a structure (and any union containing,
6556 // possibly recursively, a member that is such a structure)
6557 // shall not be a member of a structure or an element of an
6559 if (FDTy->isFunctionType()) {
6560 // Field declared as a function.
6561 Diag(FD->getLocation(), diag::err_field_declared_as_function)
6562 << FD->getDeclName();
6563 FD->setInvalidDecl();
6564 EnclosingDecl->setInvalidDecl();
6566 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 &&
6567 Record && !Record->isUnion()) {
6568 // Flexible array member.
6569 if (NumNamedMembers < 1) {
6570 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct)
6571 << FD->getDeclName();
6572 FD->setInvalidDecl();
6573 EnclosingDecl->setInvalidDecl();
6576 if (!FD->getType()->isDependentType() &&
6577 !Context.getBaseElementType(FD->getType())->isPODType()) {
6578 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type)
6579 << FD->getDeclName() << FD->getType();
6580 FD->setInvalidDecl();
6581 EnclosingDecl->setInvalidDecl();
6585 // Okay, we have a legal flexible array member at the end of the struct.
6587 Record->setHasFlexibleArrayMember(true);
6588 } else if (!FDTy->isDependentType() &&
6589 RequireCompleteType(FD->getLocation(), FD->getType(),
6590 diag::err_field_incomplete)) {
6592 FD->setInvalidDecl();
6593 EnclosingDecl->setInvalidDecl();
6595 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) {
6596 if (FDTTy->getDecl()->hasFlexibleArrayMember()) {
6597 // If this is a member of a union, then entire union becomes "flexible".
6598 if (Record && Record->isUnion()) {
6599 Record->setHasFlexibleArrayMember(true);
6601 // If this is a struct/class and this is not the last element, reject
6602 // it. Note that GCC supports variable sized arrays in the middle of
6604 if (i != NumFields-1)
6605 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct)
6606 << FD->getDeclName() << FD->getType();
6608 // We support flexible arrays at the end of structs in
6609 // other structs as an extension.
6610 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct)
6611 << FD->getDeclName();
6613 Record->setHasFlexibleArrayMember(true);
6617 if (Record && FDTTy->getDecl()->hasObjectMember())
6618 Record->setHasObjectMember(true);
6619 } else if (FDTy->isObjCObjectType()) {
6620 /// A field cannot be an Objective-c object
6621 Diag(FD->getLocation(), diag::err_statically_allocated_object);
6622 FD->setInvalidDecl();
6623 EnclosingDecl->setInvalidDecl();
6625 } else if (getLangOptions().ObjC1 &&
6626 getLangOptions().getGCMode() != LangOptions::NonGC &&
6628 (FD->getType()->isObjCObjectPointerType() ||
6629 FD->getType().isObjCGCStrong()))
6630 Record->setHasObjectMember(true);
6631 else if (Context.getAsArrayType(FD->getType())) {
6632 QualType BaseType = Context.getBaseElementType(FD->getType());
6633 if (Record && BaseType->isRecordType() &&
6634 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember())
6635 Record->setHasObjectMember(true);
6637 // Keep track of the number of named members.
6638 if (FD->getIdentifier())
6642 // Okay, we successfully defined 'Record'.
6644 Record->completeDefinition();
6646 ObjCIvarDecl **ClsFields =
6647 reinterpret_cast<ObjCIvarDecl**>(RecFields.data());
6648 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) {
6649 ID->setLocEnd(RBrac);
6650 // Add ivar's to class's DeclContext.
6651 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
6652 ClsFields[i]->setLexicalDeclContext(ID);
6653 ID->addDecl(ClsFields[i]);
6655 // Must enforce the rule that ivars in the base classes may not be
6657 if (ID->getSuperClass())
6658 DiagnoseDuplicateIvars(ID, ID->getSuperClass());
6659 } else if (ObjCImplementationDecl *IMPDecl =
6660 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
6661 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl");
6662 for (unsigned I = 0, N = RecFields.size(); I != N; ++I)
6663 // Ivar declared in @implementation never belongs to the implementation.
6664 // Only it is in implementation's lexical context.
6665 ClsFields[I]->setLexicalDeclContext(IMPDecl);
6666 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac);
6667 } else if (ObjCCategoryDecl *CDecl =
6668 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
6669 // case of ivars in class extension; all other cases have been
6670 // reported as errors elsewhere.
6671 // FIXME. Class extension does not have a LocEnd field.
6672 // CDecl->setLocEnd(RBrac);
6673 // Add ivar's to class extension's DeclContext.
6674 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
6675 ClsFields[i]->setLexicalDeclContext(CDecl);
6676 CDecl->addDecl(ClsFields[i]);
6682 ProcessDeclAttributeList(S, Record, Attr);
6684 // If there's a #pragma GCC visibility in scope, and this isn't a subclass,
6685 // set the visibility of this record.
6686 if (Record && !Record->getDeclContext()->isRecord())
6687 AddPushedVisibilityAttribute(Record);
6690 /// \brief Determine whether the given integral value is representable within
6691 /// the given type T.
6692 static bool isRepresentableIntegerValue(ASTContext &Context,
6693 llvm::APSInt &Value,
6695 assert(T->isIntegralType(Context) && "Integral type required!");
6696 unsigned BitWidth = Context.getIntWidth(T);
6698 if (Value.isUnsigned() || Value.isNonNegative())
6699 return Value.getActiveBits() < BitWidth;
6701 return Value.getMinSignedBits() <= BitWidth;
6704 // \brief Given an integral type, return the next larger integral type
6705 // (or a NULL type of no such type exists).
6706 static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) {
6707 // FIXME: Int128/UInt128 support, which also needs to be introduced into
6708 // enum checking below.
6709 assert(T->isIntegralType(Context) && "Integral type required!");
6710 const unsigned NumTypes = 4;
6711 QualType SignedIntegralTypes[NumTypes] = {
6712 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy
6714 QualType UnsignedIntegralTypes[NumTypes] = {
6715 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy,
6716 Context.UnsignedLongLongTy
6719 unsigned BitWidth = Context.getTypeSize(T);
6720 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes
6721 : UnsignedIntegralTypes;
6722 for (unsigned I = 0; I != NumTypes; ++I)
6723 if (Context.getTypeSize(Types[I]) > BitWidth)
6729 EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum,
6730 EnumConstantDecl *LastEnumConst,
6731 SourceLocation IdLoc,
6734 unsigned IntWidth = Context.Target.getIntWidth();
6735 llvm::APSInt EnumVal(IntWidth);
6738 if (Enum->isDependentType() || Val->isTypeDependent())
6739 EltTy = Context.DependentTy;
6741 // C99 6.7.2.2p2: Make sure we have an integer constant expression.
6742 SourceLocation ExpLoc;
6743 if (!Val->isValueDependent() &&
6744 VerifyIntegerConstantExpression(Val, &EnumVal)) {
6747 if (!getLangOptions().CPlusPlus) {
6749 // The expression that defines the value of an enumeration constant
6750 // shall be an integer constant expression that has a value
6751 // representable as an int.
6753 // Complain if the value is not representable in an int.
6754 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy))
6755 Diag(IdLoc, diag::ext_enum_value_not_int)
6756 << EnumVal.toString(10) << Val->getSourceRange()
6757 << (EnumVal.isUnsigned() || EnumVal.isNonNegative());
6758 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) {
6759 // Force the type of the expression to 'int'.
6760 ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast);
6764 // C++0x [dcl.enum]p5:
6765 // If the underlying type is not fixed, the type of each enumerator
6766 // is the type of its initializing value:
6767 // - If an initializer is specified for an enumerator, the
6768 // initializing value has the same type as the expression.
6769 EltTy = Val->getType();
6775 if (Enum->isDependentType())
6776 EltTy = Context.DependentTy;
6777 else if (!LastEnumConst) {
6778 // C++0x [dcl.enum]p5:
6779 // If the underlying type is not fixed, the type of each enumerator
6780 // is the type of its initializing value:
6781 // - If no initializer is specified for the first enumerator, the
6782 // initializing value has an unspecified integral type.
6784 // GCC uses 'int' for its unspecified integral type, as does
6786 EltTy = Context.IntTy;
6788 // Assign the last value + 1.
6789 EnumVal = LastEnumConst->getInitVal();
6791 EltTy = LastEnumConst->getType();
6793 // Check for overflow on increment.
6794 if (EnumVal < LastEnumConst->getInitVal()) {
6795 // C++0x [dcl.enum]p5:
6796 // If the underlying type is not fixed, the type of each enumerator
6797 // is the type of its initializing value:
6799 // - Otherwise the type of the initializing value is the same as
6800 // the type of the initializing value of the preceding enumerator
6801 // unless the incremented value is not representable in that type,
6802 // in which case the type is an unspecified integral type
6803 // sufficient to contain the incremented value. If no such type
6804 // exists, the program is ill-formed.
6805 QualType T = getNextLargerIntegralType(Context, EltTy);
6807 // There is no integral type larger enough to represent this
6808 // value. Complain, then allow the value to wrap around.
6809 EnumVal = LastEnumConst->getInitVal();
6810 EnumVal.zext(EnumVal.getBitWidth() * 2);
6811 Diag(IdLoc, diag::warn_enumerator_too_large)
6812 << EnumVal.toString(10);
6817 // Retrieve the last enumerator's value, extent that type to the
6818 // type that is supposed to be large enough to represent the incremented
6819 // value, then increment.
6820 EnumVal = LastEnumConst->getInitVal();
6821 EnumVal.setIsSigned(EltTy->isSignedIntegerType());
6822 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy));
6825 // If we're not in C++, diagnose the overflow of enumerator values,
6826 // which in C99 means that the enumerator value is not representable in
6827 // an int (C99 6.7.2.2p2). However, we support GCC's extension that
6828 // permits enumerator values that are representable in some larger
6830 if (!getLangOptions().CPlusPlus && !T.isNull())
6831 Diag(IdLoc, diag::warn_enum_value_overflow);
6832 } else if (!getLangOptions().CPlusPlus &&
6833 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) {
6834 // Enforce C99 6.7.2.2p2 even when we compute the next value.
6835 Diag(IdLoc, diag::ext_enum_value_not_int)
6836 << EnumVal.toString(10) << 1;
6841 if (!EltTy->isDependentType()) {
6842 // Make the enumerator value match the signedness and size of the
6843 // enumerator's type.
6844 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy));
6845 EnumVal.setIsSigned(EltTy->isSignedIntegerType());
6848 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy,
6853 Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl,
6854 Decl *lastEnumConst,
6855 SourceLocation IdLoc,
6857 SourceLocation EqualLoc, ExprTy *val) {
6858 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl);
6859 EnumConstantDecl *LastEnumConst =
6860 cast_or_null<EnumConstantDecl>(lastEnumConst);
6861 Expr *Val = static_cast<Expr*>(val);
6863 // The scope passed in may not be a decl scope. Zip up the scope tree until
6864 // we find one that is.
6865 S = getNonFieldDeclScope(S);
6867 // Verify that there isn't already something declared with this name in this
6869 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName,
6871 if (PrevDecl && PrevDecl->isTemplateParameter()) {
6872 // Maybe we will complain about the shadowed template parameter.
6873 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl);
6874 // Just pretend that we didn't see the previous declaration.
6879 // When in C++, we may get a TagDecl with the same name; in this case the
6880 // enum constant will 'hide' the tag.
6881 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) &&
6882 "Received TagDecl when not in C++!");
6883 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) {
6884 if (isa<EnumConstantDecl>(PrevDecl))
6885 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id;
6887 Diag(IdLoc, diag::err_redefinition) << Id;
6888 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
6893 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst,
6896 // Register this decl in the current scope stack.
6898 New->setAccess(TheEnumDecl->getAccess());
6899 PushOnScopeChains(New, S);
6905 void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc,
6906 SourceLocation RBraceLoc, Decl *EnumDeclX,
6907 Decl **Elements, unsigned NumElements,
6908 Scope *S, AttributeList *Attr) {
6909 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX);
6910 QualType EnumType = Context.getTypeDeclType(Enum);
6913 ProcessDeclAttributeList(S, Enum, Attr);
6915 if (Enum->isDependentType()) {
6916 for (unsigned i = 0; i != NumElements; ++i) {
6917 EnumConstantDecl *ECD =
6918 cast_or_null<EnumConstantDecl>(Elements[i]);
6921 ECD->setType(EnumType);
6924 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0);
6928 // TODO: If the result value doesn't fit in an int, it must be a long or long
6929 // long value. ISO C does not support this, but GCC does as an extension,
6931 unsigned IntWidth = Context.Target.getIntWidth();
6932 unsigned CharWidth = Context.Target.getCharWidth();
6933 unsigned ShortWidth = Context.Target.getShortWidth();
6935 // Verify that all the values are okay, compute the size of the values, and
6936 // reverse the list.
6937 unsigned NumNegativeBits = 0;
6938 unsigned NumPositiveBits = 0;
6940 // Keep track of whether all elements have type int.
6941 bool AllElementsInt = true;
6943 for (unsigned i = 0; i != NumElements; ++i) {
6944 EnumConstantDecl *ECD =
6945 cast_or_null<EnumConstantDecl>(Elements[i]);
6946 if (!ECD) continue; // Already issued a diagnostic.
6948 const llvm::APSInt &InitVal = ECD->getInitVal();
6950 // Keep track of the size of positive and negative values.
6951 if (InitVal.isUnsigned() || InitVal.isNonNegative())
6952 NumPositiveBits = std::max(NumPositiveBits,
6953 (unsigned)InitVal.getActiveBits());
6955 NumNegativeBits = std::max(NumNegativeBits,
6956 (unsigned)InitVal.getMinSignedBits());
6958 // Keep track of whether every enum element has type int (very commmon).
6960 AllElementsInt = ECD->getType() == Context.IntTy;
6963 // Figure out the type that should be used for this enum.
6964 // FIXME: Support -fshort-enums.
6968 // C++0x N3000 [conv.prom]p3:
6969 // An rvalue of an unscoped enumeration type whose underlying
6970 // type is not fixed can be converted to an rvalue of the first
6971 // of the following types that can represent all the values of
6972 // the enumeration: int, unsigned int, long int, unsigned long
6973 // int, long long int, or unsigned long long int.
6975 // An identifier declared as an enumeration constant has type int.
6976 // The C99 rule is modified by a gcc extension
6977 QualType BestPromotionType;
6979 bool Packed = Enum->getAttr<PackedAttr>() ? true : false;
6981 if (NumNegativeBits) {
6982 // If there is a negative value, figure out the smallest integer type (of
6983 // int/long/longlong) that fits.
6984 // If it's packed, check also if it fits a char or a short.
6985 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) {
6986 BestType = Context.SignedCharTy;
6987 BestWidth = CharWidth;
6988 } else if (Packed && NumNegativeBits <= ShortWidth &&
6989 NumPositiveBits < ShortWidth) {
6990 BestType = Context.ShortTy;
6991 BestWidth = ShortWidth;
6992 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) {
6993 BestType = Context.IntTy;
6994 BestWidth = IntWidth;
6996 BestWidth = Context.Target.getLongWidth();
6998 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) {
6999 BestType = Context.LongTy;
7001 BestWidth = Context.Target.getLongLongWidth();
7003 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth)
7004 Diag(Enum->getLocation(), diag::warn_enum_too_large);
7005 BestType = Context.LongLongTy;
7008 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType);
7010 // If there is no negative value, figure out the smallest type that fits
7011 // all of the enumerator values.
7012 // If it's packed, check also if it fits a char or a short.
7013 if (Packed && NumPositiveBits <= CharWidth) {
7014 BestType = Context.UnsignedCharTy;
7015 BestPromotionType = Context.IntTy;
7016 BestWidth = CharWidth;
7017 } else if (Packed && NumPositiveBits <= ShortWidth) {
7018 BestType = Context.UnsignedShortTy;
7019 BestPromotionType = Context.IntTy;
7020 BestWidth = ShortWidth;
7021 } else if (NumPositiveBits <= IntWidth) {
7022 BestType = Context.UnsignedIntTy;
7023 BestWidth = IntWidth;
7025 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus)
7026 ? Context.UnsignedIntTy : Context.IntTy;
7027 } else if (NumPositiveBits <=
7028 (BestWidth = Context.Target.getLongWidth())) {
7029 BestType = Context.UnsignedLongTy;
7031 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus)
7032 ? Context.UnsignedLongTy : Context.LongTy;
7034 BestWidth = Context.Target.getLongLongWidth();
7035 assert(NumPositiveBits <= BestWidth &&
7036 "How could an initializer get larger than ULL?");
7037 BestType = Context.UnsignedLongLongTy;
7039 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus)
7040 ? Context.UnsignedLongLongTy : Context.LongLongTy;
7044 // Loop over all of the enumerator constants, changing their types to match
7045 // the type of the enum if needed.
7046 for (unsigned i = 0; i != NumElements; ++i) {
7047 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]);
7048 if (!ECD) continue; // Already issued a diagnostic.
7050 // Standard C says the enumerators have int type, but we allow, as an
7051 // extension, the enumerators to be larger than int size. If each
7052 // enumerator value fits in an int, type it as an int, otherwise type it the
7053 // same as the enumerator decl itself. This means that in "enum { X = 1U }"
7054 // that X has type 'int', not 'unsigned'.
7056 // Determine whether the value fits into an int.
7057 llvm::APSInt InitVal = ECD->getInitVal();
7059 // If it fits into an integer type, force it. Otherwise force it to match
7060 // the enum decl type.
7064 if (!getLangOptions().CPlusPlus &&
7065 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) {
7066 NewTy = Context.IntTy;
7067 NewWidth = IntWidth;
7069 } else if (ECD->getType() == BestType) {
7070 // Already the right type!
7071 if (getLangOptions().CPlusPlus)
7072 // C++ [dcl.enum]p4: Following the closing brace of an
7073 // enum-specifier, each enumerator has the type of its
7075 ECD->setType(EnumType);
7079 NewWidth = BestWidth;
7080 NewSign = BestType->isSignedIntegerType();
7083 // Adjust the APSInt value.
7084 InitVal.extOrTrunc(NewWidth);
7085 InitVal.setIsSigned(NewSign);
7086 ECD->setInitVal(InitVal);
7088 // Adjust the Expr initializer and type.
7089 if (ECD->getInitExpr())
7090 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy,
7095 if (getLangOptions().CPlusPlus)
7096 // C++ [dcl.enum]p4: Following the closing brace of an
7097 // enum-specifier, each enumerator has the type of its
7099 ECD->setType(EnumType);
7101 ECD->setType(NewTy);
7104 Enum->completeDefinition(BestType, BestPromotionType,
7105 NumPositiveBits, NumNegativeBits);
7108 Decl *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, Expr *expr) {
7109 StringLiteral *AsmString = cast<StringLiteral>(expr);
7111 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext,
7113 CurContext->addDecl(New);
7117 void Sema::ActOnPragmaWeakID(IdentifierInfo* Name,
7118 SourceLocation PragmaLoc,
7119 SourceLocation NameLoc) {
7120 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName);
7123 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context));
7125 (void)WeakUndeclaredIdentifiers.insert(
7126 std::pair<IdentifierInfo*,WeakInfo>
7127 (Name, WeakInfo((IdentifierInfo*)0, NameLoc)));
7131 void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name,
7132 IdentifierInfo* AliasName,
7133 SourceLocation PragmaLoc,
7134 SourceLocation NameLoc,
7135 SourceLocation AliasNameLoc) {
7136 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc,
7137 LookupOrdinaryName);
7138 WeakInfo W = WeakInfo(Name, NameLoc);
7141 if (!PrevDecl->hasAttr<AliasAttr>())
7142 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl))
7143 DeclApplyPragmaWeak(TUScope, ND, W);
7145 (void)WeakUndeclaredIdentifiers.insert(
7146 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W));