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 "TypeLocBuilder.h"
21 #include "clang/AST/APValue.h"
22 #include "clang/AST/ASTConsumer.h"
23 #include "clang/AST/ASTContext.h"
24 #include "clang/AST/CXXInheritance.h"
25 #include "clang/AST/DeclCXX.h"
26 #include "clang/AST/DeclObjC.h"
27 #include "clang/AST/DeclTemplate.h"
28 #include "clang/AST/EvaluatedExprVisitor.h"
29 #include "clang/AST/ExprCXX.h"
30 #include "clang/AST/StmtCXX.h"
31 #include "clang/AST/CharUnits.h"
32 #include "clang/Sema/DeclSpec.h"
33 #include "clang/Sema/ParsedTemplate.h"
34 #include "clang/Parse/ParseDiagnostic.h"
35 #include "clang/Basic/PartialDiagnostic.h"
36 #include "clang/Sema/DelayedDiagnostic.h"
37 #include "clang/Basic/SourceManager.h"
38 #include "clang/Basic/TargetInfo.h"
39 // FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's)
40 #include "clang/Lex/Preprocessor.h"
41 #include "clang/Lex/HeaderSearch.h"
42 #include "clang/Lex/ModuleLoader.h"
43 #include "llvm/ADT/Triple.h"
47 using namespace clang;
50 Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) {
52 Decl *Group[2] = { OwnedType, Ptr };
53 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2));
56 return DeclGroupPtrTy::make(DeclGroupRef(Ptr));
59 /// \brief If the identifier refers to a type name within this scope,
60 /// return the declaration of that type.
62 /// This routine performs ordinary name lookup of the identifier II
63 /// within the given scope, with optional C++ scope specifier SS, to
64 /// determine whether the name refers to a type. If so, returns an
65 /// opaque pointer (actually a QualType) corresponding to that
66 /// type. Otherwise, returns NULL.
68 /// If name lookup results in an ambiguity, this routine will complain
69 /// and then return NULL.
70 ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc,
71 Scope *S, CXXScopeSpec *SS,
72 bool isClassName, bool HasTrailingDot,
73 ParsedType ObjectTypePtr,
74 bool WantNontrivialTypeSourceInfo,
75 IdentifierInfo **CorrectedII) {
76 // Determine where we will perform name lookup.
77 DeclContext *LookupCtx = 0;
79 QualType ObjectType = ObjectTypePtr.get();
80 if (ObjectType->isRecordType())
81 LookupCtx = computeDeclContext(ObjectType);
82 } else if (SS && SS->isNotEmpty()) {
83 LookupCtx = computeDeclContext(*SS, false);
86 if (isDependentScopeSpecifier(*SS)) {
88 // A qualified-id that refers to a type and in which the
89 // nested-name-specifier depends on a template-parameter (14.6.2)
90 // shall be prefixed by the keyword typename to indicate that the
91 // qualified-id denotes a type, forming an
92 // elaborated-type-specifier (7.1.5.3).
94 // We therefore do not perform any name lookup if the result would
95 // refer to a member of an unknown specialization.
99 // We know from the grammar that this name refers to a type,
100 // so build a dependent node to describe the type.
101 if (WantNontrivialTypeSourceInfo)
102 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get();
104 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context);
106 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc,
109 return ParsedType::make(T);
115 if (!LookupCtx->isDependentContext() &&
116 RequireCompleteDeclContext(*SS, LookupCtx))
120 // FIXME: LookupNestedNameSpecifierName isn't the right kind of
121 // lookup for class-names.
122 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName :
124 LookupResult Result(*this, &II, NameLoc, Kind);
126 // Perform "qualified" name lookup into the declaration context we
127 // computed, which is either the type of the base of a member access
128 // expression or the declaration context associated with a prior
129 // nested-name-specifier.
130 LookupQualifiedName(Result, LookupCtx);
132 if (ObjectTypePtr && Result.empty()) {
133 // C++ [basic.lookup.classref]p3:
134 // If the unqualified-id is ~type-name, the type-name is looked up
135 // in the context of the entire postfix-expression. If the type T of
136 // the object expression is of a class type C, the type-name is also
137 // looked up in the scope of class C. At least one of the lookups shall
138 // find a name that refers to (possibly cv-qualified) T.
139 LookupName(Result, S);
142 // Perform unqualified name lookup.
143 LookupName(Result, S);
146 NamedDecl *IIDecl = 0;
147 switch (Result.getResultKind()) {
148 case LookupResult::NotFound:
149 case LookupResult::NotFoundInCurrentInstantiation:
151 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(),
152 Kind, S, SS, 0, false,
154 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo();
156 bool MemberOfUnknownSpecialization;
157 UnqualifiedId TemplateName;
158 TemplateName.setIdentifier(NewII, NameLoc);
159 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier();
160 CXXScopeSpec NewSS, *NewSSPtr = SS;
162 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc));
165 if (Correction && (NNS || NewII != &II) &&
166 // Ignore a correction to a template type as the to-be-corrected
167 // identifier is not a template (typo correction for template names
168 // is handled elsewhere).
169 !(getLangOptions().CPlusPlus && NewSSPtr &&
170 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(),
171 false, Template, MemberOfUnknownSpecialization))) {
172 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr,
173 isClassName, HasTrailingDot, ObjectTypePtr,
174 WantNontrivialTypeSourceInfo);
176 std::string CorrectedStr(Correction.getAsString(getLangOptions()));
177 std::string CorrectedQuotedStr(
178 Correction.getQuoted(getLangOptions()));
179 Diag(NameLoc, diag::err_unknown_typename_suggest)
180 << Result.getLookupName() << CorrectedQuotedStr
181 << FixItHint::CreateReplacement(SourceRange(NameLoc),
183 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl())
184 Diag(FirstDecl->getLocation(), diag::note_previous_decl)
185 << CorrectedQuotedStr;
188 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc));
189 *CorrectedII = NewII;
194 // If typo correction failed or was not performed, fall through
195 case LookupResult::FoundOverloaded:
196 case LookupResult::FoundUnresolvedValue:
197 Result.suppressDiagnostics();
200 case LookupResult::Ambiguous:
201 // Recover from type-hiding ambiguities by hiding the type. We'll
202 // do the lookup again when looking for an object, and we can
203 // diagnose the error then. If we don't do this, then the error
204 // about hiding the type will be immediately followed by an error
205 // that only makes sense if the identifier was treated like a type.
206 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) {
207 Result.suppressDiagnostics();
211 // Look to see if we have a type anywhere in the list of results.
212 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end();
213 Res != ResEnd; ++Res) {
214 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) {
216 (*Res)->getLocation().getRawEncoding() <
217 IIDecl->getLocation().getRawEncoding())
223 // None of the entities we found is a type, so there is no way
224 // to even assume that the result is a type. In this case, don't
225 // complain about the ambiguity. The parser will either try to
226 // perform this lookup again (e.g., as an object name), which
227 // will produce the ambiguity, or will complain that it expected
229 Result.suppressDiagnostics();
233 // We found a type within the ambiguous lookup; diagnose the
234 // ambiguity and then return that type. This might be the right
235 // answer, or it might not be, but it suppresses any attempt to
236 // perform the name lookup again.
239 case LookupResult::Found:
240 IIDecl = Result.getFoundDecl();
244 assert(IIDecl && "Didn't find decl");
247 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) {
248 DiagnoseUseOfDecl(IIDecl, NameLoc);
251 T = Context.getTypeDeclType(TD);
253 if (SS && SS->isNotEmpty()) {
254 if (WantNontrivialTypeSourceInfo) {
255 // Construct a type with type-source information.
256 TypeLocBuilder Builder;
257 Builder.pushTypeSpec(T).setNameLoc(NameLoc);
259 T = getElaboratedType(ETK_None, *SS, T);
260 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T);
261 ElabTL.setKeywordLoc(SourceLocation());
262 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context));
263 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T));
265 T = getElaboratedType(ETK_None, *SS, T);
268 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) {
269 (void)DiagnoseUseOfDecl(IDecl, NameLoc);
271 T = Context.getObjCInterfaceType(IDecl);
275 // If it's not plausibly a type, suppress diagnostics.
276 Result.suppressDiagnostics();
279 return ParsedType::make(T);
282 /// isTagName() - This method is called *for error recovery purposes only*
283 /// to determine if the specified name is a valid tag name ("struct foo"). If
284 /// so, this returns the TST for the tag corresponding to it (TST_enum,
285 /// TST_union, TST_struct, TST_class). This is used to diagnose cases in C
286 /// where the user forgot to specify the tag.
287 DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) {
288 // Do a tag name lookup in this scope.
289 LookupResult R(*this, &II, SourceLocation(), LookupTagName);
290 LookupName(R, S, false);
291 R.suppressDiagnostics();
292 if (R.getResultKind() == LookupResult::Found)
293 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) {
294 switch (TD->getTagKind()) {
295 default: return DeclSpec::TST_unspecified;
296 case TTK_Struct: return DeclSpec::TST_struct;
297 case TTK_Union: return DeclSpec::TST_union;
298 case TTK_Class: return DeclSpec::TST_class;
299 case TTK_Enum: return DeclSpec::TST_enum;
303 return DeclSpec::TST_unspecified;
306 /// isMicrosoftMissingTypename - In Microsoft mode, within class scope,
307 /// if a CXXScopeSpec's type is equal to the type of one of the base classes
308 /// then downgrade the missing typename error to a warning.
309 /// This is needed for MSVC compatibility; Example:
311 /// template<class T> class A {
313 /// typedef int TYPE;
315 /// template<class T> class B : public A<T> {
317 /// A<T>::TYPE a; // no typename required because A<T> is a base class.
320 bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) {
321 if (CurContext->isRecord()) {
322 const Type *Ty = SS->getScopeRep()->getAsType();
324 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext);
325 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(),
326 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base)
327 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType()))
329 return S->isFunctionPrototypeScope();
331 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope();
334 bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II,
335 SourceLocation IILoc,
338 ParsedType &SuggestedType) {
339 // We don't have anything to suggest (yet).
340 SuggestedType = ParsedType();
342 // There may have been a typo in the name of the type. Look up typo
343 // results, in case we have something that we can suggest.
344 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc),
345 LookupOrdinaryName, S, SS, NULL,
347 std::string CorrectedStr(Corrected.getAsString(getLangOptions()));
348 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions()));
350 if (Corrected.isKeyword()) {
351 // We corrected to a keyword.
352 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it.
353 Diag(IILoc, diag::err_unknown_typename_suggest)
354 << &II << CorrectedQuotedStr;
357 NamedDecl *Result = Corrected.getCorrectionDecl();
358 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) &&
359 !Result->isInvalidDecl()) {
360 // We found a similarly-named type or interface; suggest that.
361 if (!SS || !SS->isSet())
362 Diag(IILoc, diag::err_unknown_typename_suggest)
363 << &II << CorrectedQuotedStr
364 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr);
365 else if (DeclContext *DC = computeDeclContext(*SS, false))
366 Diag(IILoc, diag::err_unknown_nested_typename_suggest)
367 << &II << DC << CorrectedQuotedStr << SS->getRange()
368 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr);
370 llvm_unreachable("could not have corrected a typo here");
372 Diag(Result->getLocation(), diag::note_previous_decl)
373 << CorrectedQuotedStr;
375 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS,
376 false, false, ParsedType(),
377 /*NonTrivialTypeSourceInfo=*/true);
383 if (getLangOptions().CPlusPlus) {
384 // See if II is a class template that the user forgot to pass arguments to.
386 Name.setIdentifier(&II, IILoc);
387 CXXScopeSpec EmptySS;
388 TemplateTy TemplateResult;
389 bool MemberOfUnknownSpecialization;
390 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false,
391 Name, ParsedType(), true, TemplateResult,
392 MemberOfUnknownSpecialization) == TNK_Type_template) {
393 TemplateName TplName = TemplateResult.getAsVal<TemplateName>();
394 Diag(IILoc, diag::err_template_missing_args) << TplName;
395 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) {
396 Diag(TplDecl->getLocation(), diag::note_template_decl_here)
397 << TplDecl->getTemplateParameters()->getSourceRange();
403 // FIXME: Should we move the logic that tries to recover from a missing tag
404 // (struct, union, enum) from Parser::ParseImplicitInt here, instead?
406 if (!SS || (!SS->isSet() && !SS->isInvalid()))
407 Diag(IILoc, diag::err_unknown_typename) << &II;
408 else if (DeclContext *DC = computeDeclContext(*SS, false))
409 Diag(IILoc, diag::err_typename_nested_not_found)
410 << &II << DC << SS->getRange();
411 else if (isDependentScopeSpecifier(*SS)) {
412 unsigned DiagID = diag::err_typename_missing;
413 if (getLangOptions().MicrosoftMode && isMicrosoftMissingTypename(SS, S))
414 DiagID = diag::warn_typename_missing;
416 Diag(SS->getRange().getBegin(), DiagID)
417 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName()
418 << SourceRange(SS->getRange().getBegin(), IILoc)
419 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename ");
420 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get();
422 assert(SS && SS->isInvalid() &&
423 "Invalid scope specifier has already been diagnosed");
429 /// \brief Determine whether the given result set contains either a type name
431 static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) {
432 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus &&
433 NextToken.is(tok::less);
435 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) {
436 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I))
439 if (CheckTemplate && isa<TemplateDecl>(*I))
446 Sema::NameClassification Sema::ClassifyName(Scope *S,
448 IdentifierInfo *&Name,
449 SourceLocation NameLoc,
450 const Token &NextToken) {
451 DeclarationNameInfo NameInfo(Name, NameLoc);
452 ObjCMethodDecl *CurMethod = getCurMethodDecl();
454 if (NextToken.is(tok::coloncolon)) {
455 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(),
456 QualType(), false, SS, 0, false);
460 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
461 LookupParsedName(Result, S, &SS, !CurMethod);
463 // Perform lookup for Objective-C instance variables (including automatically
464 // synthesized instance variables), if we're in an Objective-C method.
465 // FIXME: This lookup really, really needs to be folded in to the normal
466 // unqualified lookup mechanism.
467 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) {
468 ExprResult E = LookupInObjCMethod(Result, S, Name, true);
469 if (E.get() || E.isInvalid())
473 bool SecondTry = false;
474 bool IsFilteredTemplateName = false;
477 switch (Result.getResultKind()) {
478 case LookupResult::NotFound:
479 // If an unqualified-id is followed by a '(', then we have a function
481 if (!SS.isSet() && NextToken.is(tok::l_paren)) {
482 // In C++, this is an ADL-only call.
484 if (getLangOptions().CPlusPlus)
485 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true);
488 // If the expression that precedes the parenthesized argument list in a
489 // function call consists solely of an identifier, and if no
490 // declaration is visible for this identifier, the identifier is
491 // implicitly declared exactly as if, in the innermost block containing
492 // the function call, the declaration
494 // extern int identifier ();
498 // We also allow this in C99 as an extension.
499 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) {
501 Result.resolveKind();
502 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false);
506 // In C, we first see whether there is a tag type by the same name, in
507 // which case it's likely that the user just forget to write "enum",
508 // "struct", or "union".
509 if (!getLangOptions().CPlusPlus && !SecondTry) {
510 Result.clear(LookupTagName);
511 LookupParsedName(Result, S, &SS);
512 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) {
513 const char *TagName = 0;
514 const char *FixItTagName = 0;
515 switch (Tag->getTagKind()) {
518 FixItTagName = "class ";
523 FixItTagName = "enum ";
528 FixItTagName = "struct ";
533 FixItTagName = "union ";
537 Diag(NameLoc, diag::err_use_of_tag_name_without_tag)
538 << Name << TagName << getLangOptions().CPlusPlus
539 << FixItHint::CreateInsertion(NameLoc, FixItTagName);
543 Result.clear(LookupOrdinaryName);
546 // Perform typo correction to determine if there is another name that is
547 // close to this name.
550 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(),
551 Result.getLookupKind(), S, &SS)) {
552 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest;
553 unsigned QualifiedDiag = diag::err_no_member_suggest;
554 std::string CorrectedStr(Corrected.getAsString(getLangOptions()));
555 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions()));
557 NamedDecl *FirstDecl = Corrected.getCorrectionDecl();
558 NamedDecl *UnderlyingFirstDecl
559 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0;
560 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) &&
561 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) {
562 UnqualifiedDiag = diag::err_no_template_suggest;
563 QualifiedDiag = diag::err_no_member_template_suggest;
564 } else if (UnderlyingFirstDecl &&
565 (isa<TypeDecl>(UnderlyingFirstDecl) ||
566 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) ||
567 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) {
568 UnqualifiedDiag = diag::err_unknown_typename_suggest;
569 QualifiedDiag = diag::err_unknown_nested_typename_suggest;
573 Diag(NameLoc, UnqualifiedDiag)
574 << Name << CorrectedQuotedStr
575 << FixItHint::CreateReplacement(NameLoc, CorrectedStr);
577 Diag(NameLoc, QualifiedDiag)
578 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr
580 << FixItHint::CreateReplacement(NameLoc, CorrectedStr);
582 // Update the name, so that the caller has the new name.
583 Name = Corrected.getCorrectionAsIdentifierInfo();
585 // Also update the LookupResult...
586 // FIXME: This should probably go away at some point
588 Result.setLookupName(Corrected.getCorrection());
589 if (FirstDecl) Result.addDecl(FirstDecl);
591 // Typo correction corrected to a keyword.
592 if (Corrected.isKeyword())
593 return Corrected.getCorrectionAsIdentifierInfo();
596 Diag(FirstDecl->getLocation(), diag::note_previous_decl)
597 << CorrectedQuotedStr;
599 // If we found an Objective-C instance variable, let
600 // LookupInObjCMethod build the appropriate expression to
601 // reference the ivar.
602 // FIXME: This is a gross hack.
603 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) {
605 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier()));
613 // We failed to correct; just fall through and let the parser deal with it.
614 Result.suppressDiagnostics();
615 return NameClassification::Unknown();
617 case LookupResult::NotFoundInCurrentInstantiation:
618 // We performed name lookup into the current instantiation, and there were
619 // dependent bases, so we treat this result the same way as any other
620 // dependent nested-name-specifier.
623 // A name used in a template declaration or definition and that is
624 // dependent on a template-parameter is assumed not to name a type
625 // unless the applicable name lookup finds a type name or the name is
626 // qualified by the keyword typename.
628 // FIXME: If the next token is '<', we might want to ask the parser to
629 // perform some heroics to see if we actually have a
630 // template-argument-list, which would indicate a missing 'template'
632 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0);
634 case LookupResult::Found:
635 case LookupResult::FoundOverloaded:
636 case LookupResult::FoundUnresolvedValue:
639 case LookupResult::Ambiguous:
640 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) &&
641 hasAnyAcceptableTemplateNames(Result)) {
642 // C++ [temp.local]p3:
643 // A lookup that finds an injected-class-name (10.2) can result in an
644 // ambiguity in certain cases (for example, if it is found in more than
645 // one base class). If all of the injected-class-names that are found
646 // refer to specializations of the same class template, and if the name
647 // is followed by a template-argument-list, the reference refers to the
648 // class template itself and not a specialization thereof, and is not
651 // This filtering can make an ambiguous result into an unambiguous one,
652 // so try again after filtering out template names.
653 FilterAcceptableTemplateNames(Result);
654 if (!Result.isAmbiguous()) {
655 IsFilteredTemplateName = true;
660 // Diagnose the ambiguity and return an error.
661 return NameClassification::Error();
664 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) &&
665 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) {
666 // C++ [temp.names]p3:
667 // After name lookup (3.4) finds that a name is a template-name or that
668 // an operator-function-id or a literal- operator-id refers to a set of
669 // overloaded functions any member of which is a function template if
670 // this is followed by a <, the < is always taken as the delimiter of a
671 // template-argument-list and never as the less-than operator.
672 if (!IsFilteredTemplateName)
673 FilterAcceptableTemplateNames(Result);
675 if (!Result.empty()) {
676 bool IsFunctionTemplate;
677 TemplateName Template;
678 if (Result.end() - Result.begin() > 1) {
679 IsFunctionTemplate = true;
680 Template = Context.getOverloadedTemplateName(Result.begin(),
684 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl());
685 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD);
687 if (SS.isSet() && !SS.isInvalid())
688 Template = Context.getQualifiedTemplateName(SS.getScopeRep(),
689 /*TemplateKeyword=*/false,
692 Template = TemplateName(TD);
695 if (IsFunctionTemplate) {
696 // Function templates always go through overload resolution, at which
697 // point we'll perform the various checks (e.g., accessibility) we need
698 // to based on which function we selected.
699 Result.suppressDiagnostics();
701 return NameClassification::FunctionTemplate(Template);
704 return NameClassification::TypeTemplate(Template);
708 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl();
709 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) {
710 DiagnoseUseOfDecl(Type, NameLoc);
711 QualType T = Context.getTypeDeclType(Type);
712 return ParsedType::make(T);
715 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl);
717 // FIXME: It's unfortunate that we don't have a Type node for handling this.
718 if (ObjCCompatibleAliasDecl *Alias
719 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl))
720 Class = Alias->getClassInterface();
724 DiagnoseUseOfDecl(Class, NameLoc);
726 if (NextToken.is(tok::period)) {
727 // Interface. <something> is parsed as a property reference expression.
728 // Just return "unknown" as a fall-through for now.
729 Result.suppressDiagnostics();
730 return NameClassification::Unknown();
733 QualType T = Context.getObjCInterfaceType(Class);
734 return ParsedType::make(T);
737 if (!Result.empty() && (*Result.begin())->isCXXClassMember())
738 return BuildPossibleImplicitMemberExpr(SS, Result, 0);
740 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren));
741 return BuildDeclarationNameExpr(SS, Result, ADL);
744 // Determines the context to return to after temporarily entering a
745 // context. This depends in an unnecessarily complicated way on the
746 // exact ordering of callbacks from the parser.
747 DeclContext *Sema::getContainingDC(DeclContext *DC) {
749 // Functions defined inline within classes aren't parsed until we've
750 // finished parsing the top-level class, so the top-level class is
751 // the context we'll need to return to.
752 if (isa<FunctionDecl>(DC)) {
753 DC = DC->getLexicalParent();
755 // A function not defined within a class will always return to its
757 if (!isa<CXXRecordDecl>(DC))
760 // A C++ inline method/friend is parsed *after* the topmost class
761 // it was declared in is fully parsed ("complete"); the topmost
762 // class is the context we need to return to.
763 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent()))
766 // Return the declaration context of the topmost class the inline method is
771 return DC->getLexicalParent();
774 void Sema::PushDeclContext(Scope *S, DeclContext *DC) {
775 assert(getContainingDC(DC) == CurContext &&
776 "The next DeclContext should be lexically contained in the current one.");
781 void Sema::PopDeclContext() {
782 assert(CurContext && "DeclContext imbalance!");
784 CurContext = getContainingDC(CurContext);
785 assert(CurContext && "Popped translation unit!");
788 /// EnterDeclaratorContext - Used when we must lookup names in the context
789 /// of a declarator's nested name specifier.
791 void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) {
792 // C++0x [basic.lookup.unqual]p13:
793 // A name used in the definition of a static data member of class
794 // X (after the qualified-id of the static member) is looked up as
795 // if the name was used in a member function of X.
796 // C++0x [basic.lookup.unqual]p14:
797 // If a variable member of a namespace is defined outside of the
798 // scope of its namespace then any name used in the definition of
799 // the variable member (after the declarator-id) is looked up as
800 // if the definition of the variable member occurred in its
802 // Both of these imply that we should push a scope whose context
803 // is the semantic context of the declaration. We can't use
804 // PushDeclContext here because that context is not necessarily
805 // lexically contained in the current context. Fortunately,
806 // the containing scope should have the appropriate information.
808 assert(!S->getEntity() && "scope already has entity");
811 Scope *Ancestor = S->getParent();
812 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
813 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch");
820 void Sema::ExitDeclaratorContext(Scope *S) {
821 assert(S->getEntity() == CurContext && "Context imbalance!");
823 // Switch back to the lexical context. The safety of this is
824 // enforced by an assert in EnterDeclaratorContext.
825 Scope *Ancestor = S->getParent();
826 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent();
827 CurContext = (DeclContext*) Ancestor->getEntity();
829 // We don't need to do anything with the scope, which is going to
834 void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) {
835 FunctionDecl *FD = dyn_cast<FunctionDecl>(D);
836 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) {
837 // We assume that the caller has already called
838 // ActOnReenterTemplateScope
839 FD = TFD->getTemplatedDecl();
844 PushDeclContext(S, FD);
845 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) {
846 ParmVarDecl *Param = FD->getParamDecl(P);
847 // If the parameter has an identifier, then add it to the scope
848 if (Param->getIdentifier()) {
850 IdResolver.AddDecl(Param);
856 /// \brief Determine whether we allow overloading of the function
857 /// PrevDecl with another declaration.
859 /// This routine determines whether overloading is possible, not
860 /// whether some new function is actually an overload. It will return
861 /// true in C++ (where we can always provide overloads) or, as an
862 /// extension, in C when the previous function is already an
863 /// overloaded function declaration or has the "overloadable"
865 static bool AllowOverloadingOfFunction(LookupResult &Previous,
866 ASTContext &Context) {
867 if (Context.getLangOptions().CPlusPlus)
870 if (Previous.getResultKind() == LookupResult::FoundOverloaded)
873 return (Previous.getResultKind() == LookupResult::Found
874 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>());
877 /// Add this decl to the scope shadowed decl chains.
878 void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) {
879 // Move up the scope chain until we find the nearest enclosing
880 // non-transparent context. The declaration will be introduced into this
882 while (S->getEntity() &&
883 ((DeclContext *)S->getEntity())->isTransparentContext())
886 // Add scoped declarations into their context, so that they can be
887 // found later. Declarations without a context won't be inserted
890 CurContext->addDecl(D);
892 // Out-of-line definitions shouldn't be pushed into scope in C++.
893 // Out-of-line variable and function definitions shouldn't even in C.
894 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) &&
896 !D->getDeclContext()->getRedeclContext()->Equals(
897 D->getLexicalDeclContext()->getRedeclContext()))
900 // Template instantiations should also not be pushed into scope.
901 if (isa<FunctionDecl>(D) &&
902 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization())
905 // If this replaces anything in the current scope,
906 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()),
907 IEnd = IdResolver.end();
908 for (; I != IEnd; ++I) {
909 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) {
911 IdResolver.RemoveDecl(*I);
913 // Should only need to replace one decl.
920 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) {
921 // Implicitly-generated labels may end up getting generated in an order that
922 // isn't strictly lexical, which breaks name lookup. Be careful to insert
923 // the label at the appropriate place in the identifier chain.
924 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) {
925 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext();
926 if (IDC == CurContext) {
927 if (!S->isDeclScope(*I))
929 } else if (IDC->Encloses(CurContext))
933 IdResolver.InsertDeclAfter(I, D);
935 IdResolver.AddDecl(D);
939 bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S,
940 bool ExplicitInstantiationOrSpecialization) {
941 return IdResolver.isDeclInScope(D, Ctx, Context, S,
942 ExplicitInstantiationOrSpecialization);
945 Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) {
946 DeclContext *TargetDC = DC->getPrimaryContext();
948 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity())
949 if (ScopeDC->getPrimaryContext() == TargetDC)
951 } while ((S = S->getParent()));
956 static bool isOutOfScopePreviousDeclaration(NamedDecl *,
960 /// Filters out lookup results that don't fall within the given scope
961 /// as determined by isDeclInScope.
962 void Sema::FilterLookupForScope(LookupResult &R,
963 DeclContext *Ctx, Scope *S,
964 bool ConsiderLinkage,
965 bool ExplicitInstantiationOrSpecialization) {
966 LookupResult::Filter F = R.makeFilter();
967 while (F.hasNext()) {
968 NamedDecl *D = F.next();
970 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization))
973 if (ConsiderLinkage &&
974 isOutOfScopePreviousDeclaration(D, Ctx, Context))
983 static bool isUsingDecl(NamedDecl *D) {
984 return isa<UsingShadowDecl>(D) ||
985 isa<UnresolvedUsingTypenameDecl>(D) ||
986 isa<UnresolvedUsingValueDecl>(D);
989 /// Removes using shadow declarations from the lookup results.
990 static void RemoveUsingDecls(LookupResult &R) {
991 LookupResult::Filter F = R.makeFilter();
993 if (isUsingDecl(F.next()))
999 /// \brief Check for this common pattern:
1002 /// S(const S&); // DO NOT IMPLEMENT
1003 /// void operator=(const S&); // DO NOT IMPLEMENT
1006 static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) {
1007 // FIXME: Should check for private access too but access is set after we get
1009 if (D->doesThisDeclarationHaveABody())
1012 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D))
1013 return CD->isCopyConstructor();
1014 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D))
1015 return Method->isCopyAssignmentOperator();
1019 bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const {
1022 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>())
1025 // Ignore class templates.
1026 if (D->getDeclContext()->isDependentContext() ||
1027 D->getLexicalDeclContext()->isDependentContext())
1030 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
1031 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
1034 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) {
1035 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD))
1038 // 'static inline' functions are used in headers; don't warn.
1039 if (FD->getStorageClass() == SC_Static &&
1040 FD->isInlineSpecified())
1044 if (FD->doesThisDeclarationHaveABody() &&
1045 Context.DeclMustBeEmitted(FD))
1047 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1048 if (!VD->isFileVarDecl() ||
1049 VD->getType().isConstant(Context) ||
1050 Context.DeclMustBeEmitted(VD))
1053 if (VD->isStaticDataMember() &&
1054 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation)
1061 // Only warn for unused decls internal to the translation unit.
1062 if (D->getLinkage() == ExternalLinkage)
1068 void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) {
1072 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
1073 const FunctionDecl *First = FD->getFirstDeclaration();
1074 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First))
1075 return; // First should already be in the vector.
1078 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
1079 const VarDecl *First = VD->getFirstDeclaration();
1080 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First))
1081 return; // First should already be in the vector.
1084 if (ShouldWarnIfUnusedFileScopedDecl(D))
1085 UnusedFileScopedDecls.push_back(D);
1088 static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) {
1089 if (D->isInvalidDecl())
1092 if (D->isUsed() || D->hasAttr<UnusedAttr>())
1095 if (isa<LabelDecl>(D))
1098 // White-list anything that isn't a local variable.
1099 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) ||
1100 !D->getDeclContext()->isFunctionOrMethod())
1103 // Types of valid local variables should be complete, so this should succeed.
1104 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) {
1106 // White-list anything with an __attribute__((unused)) type.
1107 QualType Ty = VD->getType();
1109 // Only look at the outermost level of typedef.
1110 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) {
1111 if (TT->getDecl()->hasAttr<UnusedAttr>())
1115 // If we failed to complete the type for some reason, or if the type is
1116 // dependent, don't diagnose the variable.
1117 if (Ty->isIncompleteType() || Ty->isDependentType())
1120 if (const TagType *TT = Ty->getAs<TagType>()) {
1121 const TagDecl *Tag = TT->getDecl();
1122 if (Tag->hasAttr<UnusedAttr>())
1125 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) {
1126 // FIXME: Checking for the presence of a user-declared constructor
1127 // isn't completely accurate; we'd prefer to check that the initializer
1128 // has no side effects.
1129 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor())
1134 // TODO: __attribute__((unused)) templates?
1140 static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx,
1142 if (isa<LabelDecl>(D)) {
1143 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(),
1144 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true);
1145 if (AfterColon.isInvalid())
1147 Hint = FixItHint::CreateRemoval(CharSourceRange::
1148 getCharRange(D->getLocStart(), AfterColon));
1153 /// DiagnoseUnusedDecl - Emit warnings about declarations that are not used
1154 /// unless they are marked attr(unused).
1155 void Sema::DiagnoseUnusedDecl(const NamedDecl *D) {
1157 if (!ShouldDiagnoseUnusedDecl(D))
1160 GenerateFixForUnusedDecl(D, Context, Hint);
1163 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable())
1164 DiagID = diag::warn_unused_exception_param;
1165 else if (isa<LabelDecl>(D))
1166 DiagID = diag::warn_unused_label;
1168 DiagID = diag::warn_unused_variable;
1170 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint;
1173 static void CheckPoppedLabel(LabelDecl *L, Sema &S) {
1174 // Verify that we have no forward references left. If so, there was a goto
1175 // or address of a label taken, but no definition of it. Label fwd
1176 // definitions are indicated with a null substmt.
1177 if (L->getStmt() == 0)
1178 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName();
1181 void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) {
1182 if (S->decl_empty()) return;
1183 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) &&
1184 "Scope shouldn't contain decls!");
1186 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end();
1189 assert(TmpD && "This decl didn't get pushed??");
1191 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?");
1192 NamedDecl *D = cast<NamedDecl>(TmpD);
1194 if (!D->getDeclName()) continue;
1196 // Diagnose unused variables in this scope.
1197 if (!S->hasErrorOccurred())
1198 DiagnoseUnusedDecl(D);
1200 // If this was a forward reference to a label, verify it was defined.
1201 if (LabelDecl *LD = dyn_cast<LabelDecl>(D))
1202 CheckPoppedLabel(LD, *this);
1204 // Remove this name from our lexical scope.
1205 IdResolver.RemoveDecl(D);
1209 /// \brief Look for an Objective-C class in the translation unit.
1211 /// \param Id The name of the Objective-C class we're looking for. If
1212 /// typo-correction fixes this name, the Id will be updated
1213 /// to the fixed name.
1215 /// \param IdLoc The location of the name in the translation unit.
1217 /// \param TypoCorrection If true, this routine will attempt typo correction
1218 /// if there is no class with the given name.
1220 /// \returns The declaration of the named Objective-C class, or NULL if the
1221 /// class could not be found.
1222 ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id,
1223 SourceLocation IdLoc,
1224 bool DoTypoCorrection) {
1225 // The third "scope" argument is 0 since we aren't enabling lazy built-in
1226 // creation from this context.
1227 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName);
1229 if (!IDecl && DoTypoCorrection) {
1230 // Perform typo correction at the given location, but only if we
1231 // find an Objective-C class name.
1233 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName,
1234 TUScope, NULL, NULL, false, CTC_NoKeywords)) &&
1235 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) {
1236 Diag(IdLoc, diag::err_undef_interface_suggest)
1237 << Id << IDecl->getDeclName()
1238 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString());
1239 Diag(IDecl->getLocation(), diag::note_previous_decl)
1240 << IDecl->getDeclName();
1242 Id = IDecl->getIdentifier();
1246 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl);
1249 /// getNonFieldDeclScope - Retrieves the innermost scope, starting
1250 /// from S, where a non-field would be declared. This routine copes
1251 /// with the difference between C and C++ scoping rules in structs and
1252 /// unions. For example, the following code is well-formed in C but
1253 /// ill-formed in C++:
1259 /// void test_S6() {
1264 /// For the declaration of BAR, this routine will return a different
1265 /// scope. The scope S will be the scope of the unnamed enumeration
1266 /// within S6. In C++, this routine will return the scope associated
1267 /// with S6, because the enumeration's scope is a transparent
1268 /// context but structures can contain non-field names. In C, this
1269 /// routine will return the translation unit scope, since the
1270 /// enumeration's scope is a transparent context and structures cannot
1271 /// contain non-field names.
1272 Scope *Sema::getNonFieldDeclScope(Scope *S) {
1273 while (((S->getFlags() & Scope::DeclScope) == 0) ||
1275 ((DeclContext *)S->getEntity())->isTransparentContext()) ||
1276 (S->isClassScope() && !getLangOptions().CPlusPlus))
1281 /// LazilyCreateBuiltin - The specified Builtin-ID was first used at
1282 /// file scope. lazily create a decl for it. ForRedeclaration is true
1283 /// if we're creating this built-in in anticipation of redeclaring the
1285 NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid,
1286 Scope *S, bool ForRedeclaration,
1287 SourceLocation Loc) {
1288 Builtin::ID BID = (Builtin::ID)bid;
1290 ASTContext::GetBuiltinTypeError Error;
1291 QualType R = Context.GetBuiltinType(BID, Error);
1293 case ASTContext::GE_None:
1297 case ASTContext::GE_Missing_stdio:
1298 if (ForRedeclaration)
1299 Diag(Loc, diag::warn_implicit_decl_requires_stdio)
1300 << Context.BuiltinInfo.GetName(BID);
1303 case ASTContext::GE_Missing_setjmp:
1304 if (ForRedeclaration)
1305 Diag(Loc, diag::warn_implicit_decl_requires_setjmp)
1306 << Context.BuiltinInfo.GetName(BID);
1309 case ASTContext::GE_Missing_ucontext:
1310 if (ForRedeclaration)
1311 Diag(Loc, diag::warn_implicit_decl_requires_ucontext)
1312 << Context.BuiltinInfo.GetName(BID);
1316 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) {
1317 Diag(Loc, diag::ext_implicit_lib_function_decl)
1318 << Context.BuiltinInfo.GetName(BID)
1320 if (Context.BuiltinInfo.getHeaderName(BID) &&
1321 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc)
1322 != DiagnosticsEngine::Ignored)
1323 Diag(Loc, diag::note_please_include_header)
1324 << Context.BuiltinInfo.getHeaderName(BID)
1325 << Context.BuiltinInfo.GetName(BID);
1328 FunctionDecl *New = FunctionDecl::Create(Context,
1329 Context.getTranslationUnitDecl(),
1330 Loc, Loc, II, R, /*TInfo=*/0,
1333 /*hasPrototype=*/true);
1336 // Create Decl objects for each parameter, adding them to the
1338 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) {
1339 SmallVector<ParmVarDecl*, 16> Params;
1340 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) {
1342 ParmVarDecl::Create(Context, New, SourceLocation(),
1343 SourceLocation(), 0,
1344 FT->getArgType(i), /*TInfo=*/0,
1345 SC_None, SC_None, 0);
1346 parm->setScopeInfo(0, i);
1347 Params.push_back(parm);
1349 New->setParams(Params);
1352 AddKnownFunctionAttributes(New);
1354 // TUScope is the translation-unit scope to insert this function into.
1355 // FIXME: This is hideous. We need to teach PushOnScopeChains to
1356 // relate Scopes to DeclContexts, and probably eliminate CurContext
1357 // entirely, but we're not there yet.
1358 DeclContext *SavedContext = CurContext;
1359 CurContext = Context.getTranslationUnitDecl();
1360 PushOnScopeChains(New, TUScope);
1361 CurContext = SavedContext;
1365 /// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the
1366 /// same name and scope as a previous declaration 'Old'. Figure out
1367 /// how to resolve this situation, merging decls or emitting
1368 /// diagnostics as appropriate. If there was an error, set New to be invalid.
1370 void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) {
1371 // If the new decl is known invalid already, don't bother doing any
1373 if (New->isInvalidDecl()) return;
1375 // Allow multiple definitions for ObjC built-in typedefs.
1376 // FIXME: Verify the underlying types are equivalent!
1377 if (getLangOptions().ObjC1) {
1378 const IdentifierInfo *TypeID = New->getIdentifier();
1379 switch (TypeID->getLength()) {
1382 if (!TypeID->isStr("id"))
1384 Context.setObjCIdRedefinitionType(New->getUnderlyingType());
1385 // Install the built-in type for 'id', ignoring the current definition.
1386 New->setTypeForDecl(Context.getObjCIdType().getTypePtr());
1389 if (!TypeID->isStr("Class"))
1391 Context.setObjCClassRedefinitionType(New->getUnderlyingType());
1392 // Install the built-in type for 'Class', ignoring the current definition.
1393 New->setTypeForDecl(Context.getObjCClassType().getTypePtr());
1396 if (!TypeID->isStr("SEL"))
1398 Context.setObjCSelRedefinitionType(New->getUnderlyingType());
1399 // Install the built-in type for 'SEL', ignoring the current definition.
1400 New->setTypeForDecl(Context.getObjCSelType().getTypePtr());
1403 // Fall through - the typedef name was not a builtin type.
1406 // Verify the old decl was also a type.
1407 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>();
1409 Diag(New->getLocation(), diag::err_redefinition_different_kind)
1410 << New->getDeclName();
1412 NamedDecl *OldD = OldDecls.getRepresentativeDecl();
1413 if (OldD->getLocation().isValid())
1414 Diag(OldD->getLocation(), diag::note_previous_definition);
1416 return New->setInvalidDecl();
1419 // If the old declaration is invalid, just give up here.
1420 if (Old->isInvalidDecl())
1421 return New->setInvalidDecl();
1423 // Determine the "old" type we'll use for checking and diagnostics.
1425 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old))
1426 OldType = OldTypedef->getUnderlyingType();
1428 OldType = Context.getTypeDeclType(Old);
1430 // If the typedef types are not identical, reject them in all languages and
1431 // with any extensions enabled.
1433 if (OldType != New->getUnderlyingType() &&
1434 Context.getCanonicalType(OldType) !=
1435 Context.getCanonicalType(New->getUnderlyingType())) {
1437 if (isa<TypeAliasDecl>(Old))
1439 Diag(New->getLocation(), diag::err_redefinition_different_typedef)
1440 << Kind << New->getUnderlyingType() << OldType;
1441 if (Old->getLocation().isValid())
1442 Diag(Old->getLocation(), diag::note_previous_definition);
1443 return New->setInvalidDecl();
1446 // The types match. Link up the redeclaration chain if the old
1447 // declaration was a typedef.
1448 // FIXME: this is a potential source of weirdness if the type
1449 // spellings don't match exactly.
1450 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old))
1451 New->setPreviousDeclaration(Typedef);
1453 // __module_private__ is propagated to later declarations.
1454 if (Old->isModulePrivate())
1455 New->setModulePrivate();
1456 else if (New->isModulePrivate())
1457 diagnoseModulePrivateRedeclaration(New, Old);
1459 if (getLangOptions().MicrosoftExt)
1462 if (getLangOptions().CPlusPlus) {
1463 // C++ [dcl.typedef]p2:
1464 // In a given non-class scope, a typedef specifier can be used to
1465 // redefine the name of any type declared in that scope to refer
1466 // to the type to which it already refers.
1467 if (!isa<CXXRecordDecl>(CurContext))
1470 // C++0x [dcl.typedef]p4:
1471 // In a given class scope, a typedef specifier can be used to redefine
1472 // any class-name declared in that scope that is not also a typedef-name
1473 // to refer to the type to which it already refers.
1475 // This wording came in via DR424, which was a correction to the
1476 // wording in DR56, which accidentally banned code like:
1479 // typedef struct A { } A;
1482 // in the C++03 standard. We implement the C++0x semantics, which
1483 // allow the above but disallow
1490 // since that was the intent of DR56.
1491 if (!isa<TypedefNameDecl>(Old))
1494 Diag(New->getLocation(), diag::err_redefinition)
1495 << New->getDeclName();
1496 Diag(Old->getLocation(), diag::note_previous_definition);
1497 return New->setInvalidDecl();
1500 // If we have a redefinition of a typedef in C, emit a warning. This warning
1501 // is normally mapped to an error, but can be controlled with
1502 // -Wtypedef-redefinition. If either the original or the redefinition is
1503 // in a system header, don't emit this for compatibility with GCC.
1504 if (getDiagnostics().getSuppressSystemWarnings() &&
1505 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) ||
1506 Context.getSourceManager().isInSystemHeader(New->getLocation())))
1509 Diag(New->getLocation(), diag::warn_redefinition_of_typedef)
1510 << New->getDeclName();
1511 Diag(Old->getLocation(), diag::note_previous_definition);
1515 /// DeclhasAttr - returns true if decl Declaration already has the target
1518 DeclHasAttr(const Decl *D, const Attr *A) {
1519 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A);
1520 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A);
1521 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i)
1522 if ((*i)->getKind() == A->getKind()) {
1524 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation())
1528 // FIXME: Don't hardcode this check
1529 if (OA && isa<OwnershipAttr>(*i))
1530 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind();
1537 /// mergeDeclAttributes - Copy attributes from the Old decl to the New one.
1538 static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl,
1539 ASTContext &C, bool mergeDeprecation = true) {
1540 if (!oldDecl->hasAttrs())
1543 bool foundAny = newDecl->hasAttrs();
1545 // Ensure that any moving of objects within the allocated map is done before
1547 if (!foundAny) newDecl->setAttrs(AttrVec());
1549 for (specific_attr_iterator<InheritableAttr>
1550 i = oldDecl->specific_attr_begin<InheritableAttr>(),
1551 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) {
1552 // Ignore deprecated/unavailable/availability attributes if requested.
1553 if (!mergeDeprecation &&
1554 (isa<DeprecatedAttr>(*i) ||
1555 isa<UnavailableAttr>(*i) ||
1556 isa<AvailabilityAttr>(*i)))
1559 if (!DeclHasAttr(newDecl, *i)) {
1560 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C));
1561 newAttr->setInherited(true);
1562 newDecl->addAttr(newAttr);
1567 if (!foundAny) newDecl->dropAttrs();
1570 /// mergeParamDeclAttributes - Copy attributes from the old parameter
1572 static void mergeParamDeclAttributes(ParmVarDecl *newDecl,
1573 const ParmVarDecl *oldDecl,
1575 if (!oldDecl->hasAttrs())
1578 bool foundAny = newDecl->hasAttrs();
1580 // Ensure that any moving of objects within the allocated map is
1581 // done before we process them.
1582 if (!foundAny) newDecl->setAttrs(AttrVec());
1584 for (specific_attr_iterator<InheritableParamAttr>
1585 i = oldDecl->specific_attr_begin<InheritableParamAttr>(),
1586 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) {
1587 if (!DeclHasAttr(newDecl, *i)) {
1588 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C));
1589 newAttr->setInherited(true);
1590 newDecl->addAttr(newAttr);
1595 if (!foundAny) newDecl->dropAttrs();
1600 /// Used in MergeFunctionDecl to keep track of function parameters in
1602 struct GNUCompatibleParamWarning {
1603 ParmVarDecl *OldParm;
1604 ParmVarDecl *NewParm;
1605 QualType PromotedType;
1610 /// getSpecialMember - get the special member enum for a method.
1611 Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) {
1612 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) {
1613 if (Ctor->isDefaultConstructor())
1614 return Sema::CXXDefaultConstructor;
1616 if (Ctor->isCopyConstructor())
1617 return Sema::CXXCopyConstructor;
1619 if (Ctor->isMoveConstructor())
1620 return Sema::CXXMoveConstructor;
1621 } else if (isa<CXXDestructorDecl>(MD)) {
1622 return Sema::CXXDestructor;
1623 } else if (MD->isCopyAssignmentOperator()) {
1624 return Sema::CXXCopyAssignment;
1625 } else if (MD->isMoveAssignmentOperator()) {
1626 return Sema::CXXMoveAssignment;
1629 return Sema::CXXInvalid;
1632 /// canRedefineFunction - checks if a function can be redefined. Currently,
1633 /// only extern inline functions can be redefined, and even then only in
1635 static bool canRedefineFunction(const FunctionDecl *FD,
1636 const LangOptions& LangOpts) {
1637 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) &&
1638 !LangOpts.CPlusPlus &&
1639 FD->isInlineSpecified() &&
1640 FD->getStorageClass() == SC_Extern);
1643 /// MergeFunctionDecl - We just parsed a function 'New' from
1644 /// declarator D which has the same name and scope as a previous
1645 /// declaration 'Old'. Figure out how to resolve this situation,
1646 /// merging decls or emitting diagnostics as appropriate.
1648 /// In C++, New and Old must be declarations that are not
1649 /// overloaded. Use IsOverload to determine whether New and Old are
1650 /// overloaded, and to select the Old declaration that New should be
1653 /// Returns true if there was an error, false otherwise.
1654 bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) {
1655 // Verify the old decl was also a function.
1656 FunctionDecl *Old = 0;
1657 if (FunctionTemplateDecl *OldFunctionTemplate
1658 = dyn_cast<FunctionTemplateDecl>(OldD))
1659 Old = OldFunctionTemplate->getTemplatedDecl();
1661 Old = dyn_cast<FunctionDecl>(OldD);
1663 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) {
1664 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse);
1665 Diag(Shadow->getTargetDecl()->getLocation(),
1666 diag::note_using_decl_target);
1667 Diag(Shadow->getUsingDecl()->getLocation(),
1668 diag::note_using_decl) << 0;
1672 Diag(New->getLocation(), diag::err_redefinition_different_kind)
1673 << New->getDeclName();
1674 Diag(OldD->getLocation(), diag::note_previous_definition);
1678 // Determine whether the previous declaration was a definition,
1679 // implicit declaration, or a declaration.
1680 diag::kind PrevDiag;
1681 if (Old->isThisDeclarationADefinition())
1682 PrevDiag = diag::note_previous_definition;
1683 else if (Old->isImplicit())
1684 PrevDiag = diag::note_previous_implicit_declaration;
1686 PrevDiag = diag::note_previous_declaration;
1688 QualType OldQType = Context.getCanonicalType(Old->getType());
1689 QualType NewQType = Context.getCanonicalType(New->getType());
1691 // Don't complain about this if we're in GNU89 mode and the old function
1692 // is an extern inline function.
1693 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) &&
1694 New->getStorageClass() == SC_Static &&
1695 Old->getStorageClass() != SC_Static &&
1696 !canRedefineFunction(Old, getLangOptions())) {
1697 if (getLangOptions().MicrosoftExt) {
1698 Diag(New->getLocation(), diag::warn_static_non_static) << New;
1699 Diag(Old->getLocation(), PrevDiag);
1701 Diag(New->getLocation(), diag::err_static_non_static) << New;
1702 Diag(Old->getLocation(), PrevDiag);
1707 // If a function is first declared with a calling convention, but is
1708 // later declared or defined without one, the second decl assumes the
1709 // calling convention of the first.
1711 // For the new decl, we have to look at the NON-canonical type to tell the
1712 // difference between a function that really doesn't have a calling
1713 // convention and one that is declared cdecl. That's because in
1714 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away
1715 // because it is the default calling convention.
1717 // Note also that we DO NOT return at this point, because we still have
1718 // other tests to run.
1719 const FunctionType *OldType = cast<FunctionType>(OldQType);
1720 const FunctionType *NewType = New->getType()->getAs<FunctionType>();
1721 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo();
1722 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo();
1723 bool RequiresAdjustment = false;
1724 if (OldTypeInfo.getCC() != CC_Default &&
1725 NewTypeInfo.getCC() == CC_Default) {
1726 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC());
1727 RequiresAdjustment = true;
1728 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(),
1729 NewTypeInfo.getCC())) {
1730 // Calling conventions really aren't compatible, so complain.
1731 Diag(New->getLocation(), diag::err_cconv_change)
1732 << FunctionType::getNameForCallConv(NewTypeInfo.getCC())
1733 << (OldTypeInfo.getCC() == CC_Default)
1734 << (OldTypeInfo.getCC() == CC_Default ? "" :
1735 FunctionType::getNameForCallConv(OldTypeInfo.getCC()));
1736 Diag(Old->getLocation(), diag::note_previous_declaration);
1740 // FIXME: diagnose the other way around?
1741 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) {
1742 NewTypeInfo = NewTypeInfo.withNoReturn(true);
1743 RequiresAdjustment = true;
1746 // Merge regparm attribute.
1747 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() ||
1748 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) {
1749 if (NewTypeInfo.getHasRegParm()) {
1750 Diag(New->getLocation(), diag::err_regparm_mismatch)
1751 << NewType->getRegParmType()
1752 << OldType->getRegParmType();
1753 Diag(Old->getLocation(), diag::note_previous_declaration);
1757 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm());
1758 RequiresAdjustment = true;
1761 // Merge ns_returns_retained attribute.
1762 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) {
1763 if (NewTypeInfo.getProducesResult()) {
1764 Diag(New->getLocation(), diag::err_returns_retained_mismatch);
1765 Diag(Old->getLocation(), diag::note_previous_declaration);
1769 NewTypeInfo = NewTypeInfo.withProducesResult(true);
1770 RequiresAdjustment = true;
1773 if (RequiresAdjustment) {
1774 NewType = Context.adjustFunctionType(NewType, NewTypeInfo);
1775 New->setType(QualType(NewType, 0));
1776 NewQType = Context.getCanonicalType(New->getType());
1779 if (getLangOptions().CPlusPlus) {
1781 // Certain function declarations cannot be overloaded:
1782 // -- Function declarations that differ only in the return type
1783 // cannot be overloaded.
1784 QualType OldReturnType = OldType->getResultType();
1785 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType();
1787 if (OldReturnType != NewReturnType) {
1788 if (NewReturnType->isObjCObjectPointerType()
1789 && OldReturnType->isObjCObjectPointerType())
1790 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType);
1791 if (ResQT.isNull()) {
1792 if (New->isCXXClassMember() && New->isOutOfLine())
1793 Diag(New->getLocation(),
1794 diag::err_member_def_does_not_match_ret_type) << New;
1796 Diag(New->getLocation(), diag::err_ovl_diff_return_type);
1797 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
1804 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old);
1805 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New);
1806 if (OldMethod && NewMethod) {
1807 // Preserve triviality.
1808 NewMethod->setTrivial(OldMethod->isTrivial());
1810 // MSVC allows explicit template specialization at class scope:
1811 // 2 CXMethodDecls referring to the same function will be injected.
1812 // We don't want a redeclartion error.
1813 bool IsClassScopeExplicitSpecialization =
1814 OldMethod->isFunctionTemplateSpecialization() &&
1815 NewMethod->isFunctionTemplateSpecialization();
1816 bool isFriend = NewMethod->getFriendObjectKind();
1818 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() &&
1819 !IsClassScopeExplicitSpecialization) {
1820 // -- Member function declarations with the same name and the
1821 // same parameter types cannot be overloaded if any of them
1822 // is a static member function declaration.
1823 if (OldMethod->isStatic() || NewMethod->isStatic()) {
1824 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member);
1825 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
1829 // C++ [class.mem]p1:
1830 // [...] A member shall not be declared twice in the
1831 // member-specification, except that a nested class or member
1832 // class template can be declared and then later defined.
1834 if (isa<CXXConstructorDecl>(OldMethod))
1835 NewDiag = diag::err_constructor_redeclared;
1836 else if (isa<CXXDestructorDecl>(NewMethod))
1837 NewDiag = diag::err_destructor_redeclared;
1838 else if (isa<CXXConversionDecl>(NewMethod))
1839 NewDiag = diag::err_conv_function_redeclared;
1841 NewDiag = diag::err_member_redeclared;
1843 Diag(New->getLocation(), NewDiag);
1844 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
1846 // Complain if this is an explicit declaration of a special
1847 // member that was initially declared implicitly.
1849 // As an exception, it's okay to befriend such methods in order
1850 // to permit the implicit constructor/destructor/operator calls.
1851 } else if (OldMethod->isImplicit()) {
1853 NewMethod->setImplicit();
1855 Diag(NewMethod->getLocation(),
1856 diag::err_definition_of_implicitly_declared_member)
1857 << New << getSpecialMember(OldMethod);
1860 } else if (OldMethod->isExplicitlyDefaulted()) {
1861 Diag(NewMethod->getLocation(),
1862 diag::err_definition_of_explicitly_defaulted_member)
1863 << getSpecialMember(OldMethod);
1869 // All declarations for a function shall agree exactly in both the
1870 // return type and the parameter-type-list.
1871 // We also want to respect all the extended bits except noreturn.
1873 // noreturn should now match unless the old type info didn't have it.
1874 QualType OldQTypeForComparison = OldQType;
1875 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) {
1876 assert(OldQType == QualType(OldType, 0));
1877 const FunctionType *OldTypeForComparison
1878 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true));
1879 OldQTypeForComparison = QualType(OldTypeForComparison, 0);
1880 assert(OldQTypeForComparison.isCanonical());
1883 if (OldQTypeForComparison == NewQType)
1884 return MergeCompatibleFunctionDecls(New, Old);
1886 // Fall through for conflicting redeclarations and redefinitions.
1889 // C: Function types need to be compatible, not identical. This handles
1890 // duplicate function decls like "void f(int); void f(enum X);" properly.
1891 if (!getLangOptions().CPlusPlus &&
1892 Context.typesAreCompatible(OldQType, NewQType)) {
1893 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>();
1894 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>();
1895 const FunctionProtoType *OldProto = 0;
1896 if (isa<FunctionNoProtoType>(NewFuncType) &&
1897 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) {
1898 // The old declaration provided a function prototype, but the
1899 // new declaration does not. Merge in the prototype.
1900 assert(!OldProto->hasExceptionSpec() && "Exception spec in C");
1901 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(),
1902 OldProto->arg_type_end());
1903 NewQType = Context.getFunctionType(NewFuncType->getResultType(),
1904 ParamTypes.data(), ParamTypes.size(),
1905 OldProto->getExtProtoInfo());
1906 New->setType(NewQType);
1907 New->setHasInheritedPrototype();
1909 // Synthesize a parameter for each argument type.
1910 SmallVector<ParmVarDecl*, 16> Params;
1911 for (FunctionProtoType::arg_type_iterator
1912 ParamType = OldProto->arg_type_begin(),
1913 ParamEnd = OldProto->arg_type_end();
1914 ParamType != ParamEnd; ++ParamType) {
1915 ParmVarDecl *Param = ParmVarDecl::Create(Context, New,
1917 SourceLocation(), 0,
1918 *ParamType, /*TInfo=*/0,
1921 Param->setScopeInfo(0, Params.size());
1922 Param->setImplicit();
1923 Params.push_back(Param);
1926 New->setParams(Params);
1929 return MergeCompatibleFunctionDecls(New, Old);
1932 // GNU C permits a K&R definition to follow a prototype declaration
1933 // if the declared types of the parameters in the K&R definition
1934 // match the types in the prototype declaration, even when the
1935 // promoted types of the parameters from the K&R definition differ
1936 // from the types in the prototype. GCC then keeps the types from
1939 // If a variadic prototype is followed by a non-variadic K&R definition,
1940 // the K&R definition becomes variadic. This is sort of an edge case, but
1941 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and
1943 if (!getLangOptions().CPlusPlus &&
1944 Old->hasPrototype() && !New->hasPrototype() &&
1945 New->getType()->getAs<FunctionProtoType>() &&
1946 Old->getNumParams() == New->getNumParams()) {
1947 SmallVector<QualType, 16> ArgTypes;
1948 SmallVector<GNUCompatibleParamWarning, 16> Warnings;
1949 const FunctionProtoType *OldProto
1950 = Old->getType()->getAs<FunctionProtoType>();
1951 const FunctionProtoType *NewProto
1952 = New->getType()->getAs<FunctionProtoType>();
1954 // Determine whether this is the GNU C extension.
1955 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(),
1956 NewProto->getResultType());
1957 bool LooseCompatible = !MergedReturn.isNull();
1958 for (unsigned Idx = 0, End = Old->getNumParams();
1959 LooseCompatible && Idx != End; ++Idx) {
1960 ParmVarDecl *OldParm = Old->getParamDecl(Idx);
1961 ParmVarDecl *NewParm = New->getParamDecl(Idx);
1962 if (Context.typesAreCompatible(OldParm->getType(),
1963 NewProto->getArgType(Idx))) {
1964 ArgTypes.push_back(NewParm->getType());
1965 } else if (Context.typesAreCompatible(OldParm->getType(),
1967 /*CompareUnqualified=*/true)) {
1968 GNUCompatibleParamWarning Warn
1969 = { OldParm, NewParm, NewProto->getArgType(Idx) };
1970 Warnings.push_back(Warn);
1971 ArgTypes.push_back(NewParm->getType());
1973 LooseCompatible = false;
1976 if (LooseCompatible) {
1977 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) {
1978 Diag(Warnings[Warn].NewParm->getLocation(),
1979 diag::ext_param_promoted_not_compatible_with_prototype)
1980 << Warnings[Warn].PromotedType
1981 << Warnings[Warn].OldParm->getType();
1982 if (Warnings[Warn].OldParm->getLocation().isValid())
1983 Diag(Warnings[Warn].OldParm->getLocation(),
1984 diag::note_previous_declaration);
1987 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0],
1989 OldProto->getExtProtoInfo()));
1990 return MergeCompatibleFunctionDecls(New, Old);
1993 // Fall through to diagnose conflicting types.
1996 // A function that has already been declared has been redeclared or defined
1997 // with a different type- show appropriate diagnostic
1998 if (unsigned BuiltinID = Old->getBuiltinID()) {
1999 // The user has declared a builtin function with an incompatible
2001 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) {
2002 // The function the user is redeclaring is a library-defined
2003 // function like 'malloc' or 'printf'. Warn about the
2004 // redeclaration, then pretend that we don't know about this
2005 // library built-in.
2006 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New;
2007 Diag(Old->getLocation(), diag::note_previous_builtin_declaration)
2008 << Old << Old->getType();
2009 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin);
2010 Old->setInvalidDecl();
2014 PrevDiag = diag::note_previous_builtin_declaration;
2017 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName();
2018 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType();
2022 /// \brief Completes the merge of two function declarations that are
2023 /// known to be compatible.
2025 /// This routine handles the merging of attributes and other
2026 /// properties of function declarations form the old declaration to
2027 /// the new declaration, once we know that New is in fact a
2028 /// redeclaration of Old.
2031 bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) {
2032 // Merge the attributes
2033 mergeDeclAttributes(New, Old, Context);
2035 // Merge the storage class.
2036 if (Old->getStorageClass() != SC_Extern &&
2037 Old->getStorageClass() != SC_None)
2038 New->setStorageClass(Old->getStorageClass());
2040 // Merge "pure" flag.
2044 // __module_private__ is propagated to later declarations.
2045 if (Old->isModulePrivate())
2046 New->setModulePrivate();
2047 else if (New->isModulePrivate())
2048 diagnoseModulePrivateRedeclaration(New, Old);
2050 // Merge attributes from the parameters. These can mismatch with K&R
2052 if (New->getNumParams() == Old->getNumParams())
2053 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i)
2054 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i),
2057 if (getLangOptions().CPlusPlus)
2058 return MergeCXXFunctionDecl(New, Old);
2064 void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod,
2065 const ObjCMethodDecl *oldMethod) {
2066 // We don't want to merge unavailable and deprecated attributes
2067 // except from interface to implementation.
2068 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext());
2070 // Merge the attributes.
2071 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation);
2073 // Merge attributes from the parameters.
2074 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin();
2075 for (ObjCMethodDecl::param_iterator
2076 ni = newMethod->param_begin(), ne = newMethod->param_end();
2077 ni != ne; ++ni, ++oi)
2078 mergeParamDeclAttributes(*ni, *oi, Context);
2080 CheckObjCMethodOverride(newMethod, oldMethod, true);
2083 /// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and
2084 /// scope as a previous declaration 'Old'. Figure out how to merge their types,
2085 /// emitting diagnostics as appropriate.
2087 /// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back
2088 /// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't
2089 /// check them before the initializer is attached.
2091 void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) {
2092 if (New->isInvalidDecl() || Old->isInvalidDecl())
2096 if (getLangOptions().CPlusPlus) {
2097 AutoType *AT = New->getType()->getContainedAutoType();
2098 if (AT && !AT->isDeduced()) {
2099 // We don't know what the new type is until the initializer is attached.
2101 } else if (Context.hasSameType(New->getType(), Old->getType())) {
2102 // These could still be something that needs exception specs checked.
2103 return MergeVarDeclExceptionSpecs(New, Old);
2105 // C++ [basic.link]p10:
2106 // [...] the types specified by all declarations referring to a given
2107 // object or function shall be identical, except that declarations for an
2108 // array object can specify array types that differ by the presence or
2109 // absence of a major array bound (8.3.4).
2110 else if (Old->getType()->isIncompleteArrayType() &&
2111 New->getType()->isArrayType()) {
2112 CanQual<ArrayType> OldArray
2113 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>();
2114 CanQual<ArrayType> NewArray
2115 = Context.getCanonicalType(New->getType())->getAs<ArrayType>();
2116 if (OldArray->getElementType() == NewArray->getElementType())
2117 MergedT = New->getType();
2118 } else if (Old->getType()->isArrayType() &&
2119 New->getType()->isIncompleteArrayType()) {
2120 CanQual<ArrayType> OldArray
2121 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>();
2122 CanQual<ArrayType> NewArray
2123 = Context.getCanonicalType(New->getType())->getAs<ArrayType>();
2124 if (OldArray->getElementType() == NewArray->getElementType())
2125 MergedT = Old->getType();
2126 } else if (New->getType()->isObjCObjectPointerType()
2127 && Old->getType()->isObjCObjectPointerType()) {
2128 MergedT = Context.mergeObjCGCQualifiers(New->getType(),
2132 MergedT = Context.mergeTypes(New->getType(), Old->getType());
2134 if (MergedT.isNull()) {
2135 Diag(New->getLocation(), diag::err_redefinition_different_type)
2136 << New->getDeclName();
2137 Diag(Old->getLocation(), diag::note_previous_definition);
2138 return New->setInvalidDecl();
2140 New->setType(MergedT);
2143 /// MergeVarDecl - We just parsed a variable 'New' which has the same name
2144 /// and scope as a previous declaration 'Old'. Figure out how to resolve this
2145 /// situation, merging decls or emitting diagnostics as appropriate.
2147 /// Tentative definition rules (C99 6.9.2p2) are checked by
2148 /// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative
2149 /// definitions here, since the initializer hasn't been attached.
2151 void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) {
2152 // If the new decl is already invalid, don't do any other checking.
2153 if (New->isInvalidDecl())
2156 // Verify the old decl was also a variable.
2158 if (!Previous.isSingleResult() ||
2159 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) {
2160 Diag(New->getLocation(), diag::err_redefinition_different_kind)
2161 << New->getDeclName();
2162 Diag(Previous.getRepresentativeDecl()->getLocation(),
2163 diag::note_previous_definition);
2164 return New->setInvalidDecl();
2167 // C++ [class.mem]p1:
2168 // A member shall not be declared twice in the member-specification [...]
2170 // Here, we need only consider static data members.
2171 if (Old->isStaticDataMember() && !New->isOutOfLine()) {
2172 Diag(New->getLocation(), diag::err_duplicate_member)
2173 << New->getIdentifier();
2174 Diag(Old->getLocation(), diag::note_previous_declaration);
2175 New->setInvalidDecl();
2178 mergeDeclAttributes(New, Old, Context);
2179 // Warn if an already-declared variable is made a weak_import in a subsequent declaration
2180 if (New->getAttr<WeakImportAttr>() &&
2181 Old->getStorageClass() == SC_None &&
2182 !Old->getAttr<WeakImportAttr>()) {
2183 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName();
2184 Diag(Old->getLocation(), diag::note_previous_definition);
2185 // Remove weak_import attribute on new declaration.
2186 New->dropAttr<WeakImportAttr>();
2190 MergeVarDeclTypes(New, Old);
2191 if (New->isInvalidDecl())
2194 // C99 6.2.2p4: Check if we have a static decl followed by a non-static.
2195 if (New->getStorageClass() == SC_Static &&
2196 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) {
2197 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName();
2198 Diag(Old->getLocation(), diag::note_previous_definition);
2199 return New->setInvalidDecl();
2202 // For an identifier declared with the storage-class specifier
2203 // extern in a scope in which a prior declaration of that
2204 // identifier is visible,23) if the prior declaration specifies
2205 // internal or external linkage, the linkage of the identifier at
2206 // the later declaration is the same as the linkage specified at
2207 // the prior declaration. If no prior declaration is visible, or
2208 // if the prior declaration specifies no linkage, then the
2209 // identifier has external linkage.
2210 if (New->hasExternalStorage() && Old->hasLinkage())
2212 else if (New->getStorageClass() != SC_Static &&
2213 Old->getStorageClass() == SC_Static) {
2214 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName();
2215 Diag(Old->getLocation(), diag::note_previous_definition);
2216 return New->setInvalidDecl();
2219 // Check if extern is followed by non-extern and vice-versa.
2220 if (New->hasExternalStorage() &&
2221 !Old->hasLinkage() && Old->isLocalVarDecl()) {
2222 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName();
2223 Diag(Old->getLocation(), diag::note_previous_definition);
2224 return New->setInvalidDecl();
2226 if (Old->hasExternalStorage() &&
2227 !New->hasLinkage() && New->isLocalVarDecl()) {
2228 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName();
2229 Diag(Old->getLocation(), diag::note_previous_definition);
2230 return New->setInvalidDecl();
2233 // __module_private__ is propagated to later declarations.
2234 if (Old->isModulePrivate())
2235 New->setModulePrivate();
2236 else if (New->isModulePrivate())
2237 diagnoseModulePrivateRedeclaration(New, Old);
2239 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup.
2241 // FIXME: The test for external storage here seems wrong? We still
2242 // need to check for mismatches.
2243 if (!New->hasExternalStorage() && !New->isFileVarDecl() &&
2244 // Don't complain about out-of-line definitions of static members.
2245 !(Old->getLexicalDeclContext()->isRecord() &&
2246 !New->getLexicalDeclContext()->isRecord())) {
2247 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName();
2248 Diag(Old->getLocation(), diag::note_previous_definition);
2249 return New->setInvalidDecl();
2252 if (New->isThreadSpecified() && !Old->isThreadSpecified()) {
2253 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName();
2254 Diag(Old->getLocation(), diag::note_previous_definition);
2255 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) {
2256 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName();
2257 Diag(Old->getLocation(), diag::note_previous_definition);
2260 // C++ doesn't have tentative definitions, so go right ahead and check here.
2262 if (getLangOptions().CPlusPlus &&
2263 New->isThisDeclarationADefinition() == VarDecl::Definition &&
2264 (Def = Old->getDefinition())) {
2265 Diag(New->getLocation(), diag::err_redefinition)
2266 << New->getDeclName();
2267 Diag(Def->getLocation(), diag::note_previous_definition);
2268 New->setInvalidDecl();
2272 // For an identifier declared with the storage-class specifier extern in a
2273 // scope in which a prior declaration of that identifier is visible, if
2274 // the prior declaration specifies internal or external linkage, the linkage
2275 // of the identifier at the later declaration is the same as the linkage
2276 // specified at the prior declaration.
2277 // FIXME. revisit this code.
2278 if (New->hasExternalStorage() &&
2279 Old->getLinkage() == InternalLinkage &&
2280 New->getDeclContext() == Old->getDeclContext())
2281 New->setStorageClass(Old->getStorageClass());
2283 // Keep a chain of previous declarations.
2284 New->setPreviousDeclaration(Old);
2286 // Inherit access appropriately.
2287 New->setAccess(Old->getAccess());
2290 /// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with
2291 /// no declarator (e.g. "struct foo;") is parsed.
2292 Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS,
2294 return ParsedFreeStandingDeclSpec(S, AS, DS,
2295 MultiTemplateParamsArg(*this, 0, 0));
2298 /// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with
2299 /// no declarator (e.g. "struct foo;") is parsed. It also accopts template
2300 /// parameters to cope with template friend declarations.
2301 Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS,
2303 MultiTemplateParamsArg TemplateParams) {
2306 if (DS.getTypeSpecType() == DeclSpec::TST_class ||
2307 DS.getTypeSpecType() == DeclSpec::TST_struct ||
2308 DS.getTypeSpecType() == DeclSpec::TST_union ||
2309 DS.getTypeSpecType() == DeclSpec::TST_enum) {
2310 TagD = DS.getRepAsDecl();
2312 if (!TagD) // We probably had an error
2315 // Note that the above type specs guarantee that the
2316 // type rep is a Decl, whereas in many of the others
2318 Tag = dyn_cast<TagDecl>(TagD);
2322 Tag->setFreeStanding();
2324 if (unsigned TypeQuals = DS.getTypeQualifiers()) {
2325 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object
2326 // or incomplete types shall not be restrict-qualified."
2327 if (TypeQuals & DeclSpec::TQ_restrict)
2328 Diag(DS.getRestrictSpecLoc(),
2329 diag::err_typecheck_invalid_restrict_not_pointer_noarg)
2330 << DS.getSourceRange();
2333 if (DS.isConstexprSpecified()) {
2334 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations
2335 // and definitions of functions and variables.
2337 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag)
2338 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 :
2339 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 :
2340 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3);
2342 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators);
2343 // Don't emit warnings after this error.
2347 if (DS.isFriendSpecified()) {
2348 // If we're dealing with a decl but not a TagDecl, assume that
2349 // whatever routines created it handled the friendship aspect.
2352 return ActOnFriendTypeDecl(S, DS, TemplateParams);
2355 // Track whether we warned about the fact that there aren't any
2357 bool emittedWarning = false;
2359 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) {
2360 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList());
2362 if (!Record->getDeclName() && Record->isCompleteDefinition() &&
2363 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) {
2364 if (getLangOptions().CPlusPlus ||
2365 Record->getDeclContext()->isRecord())
2366 return BuildAnonymousStructOrUnion(S, DS, AS, Record);
2368 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators)
2369 << DS.getSourceRange();
2370 emittedWarning = true;
2374 // Check for Microsoft C extension: anonymous struct.
2375 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus &&
2376 CurContext->isRecord() &&
2377 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) {
2378 // Handle 2 kinds of anonymous struct:
2381 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct.
2382 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag);
2383 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) ||
2384 (DS.getTypeSpecType() == DeclSpec::TST_typename &&
2385 DS.getRepAsType().get()->isStructureType())) {
2386 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct)
2387 << DS.getSourceRange();
2388 return BuildMicrosoftCAnonymousStruct(S, DS, Record);
2392 if (getLangOptions().CPlusPlus &&
2393 DS.getStorageClassSpec() != DeclSpec::SCS_typedef)
2394 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag))
2395 if (Enum->enumerator_begin() == Enum->enumerator_end() &&
2396 !Enum->getIdentifier() && !Enum->isInvalidDecl()) {
2397 Diag(Enum->getLocation(), diag::ext_no_declarators)
2398 << DS.getSourceRange();
2399 emittedWarning = true;
2402 // Skip all the checks below if we have a type error.
2403 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD;
2405 if (!DS.isMissingDeclaratorOk()) {
2406 // Warn about typedefs of enums without names, since this is an
2407 // extension in both Microsoft and GNU.
2408 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef &&
2409 Tag && isa<EnumDecl>(Tag)) {
2410 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name)
2411 << DS.getSourceRange();
2415 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators)
2416 << DS.getSourceRange();
2417 emittedWarning = true;
2420 // We're going to complain about a bunch of spurious specifiers;
2421 // only do this if we're declaring a tag, because otherwise we
2422 // should be getting diag::ext_no_declarators.
2423 if (emittedWarning || (TagD && TagD->isInvalidDecl()))
2426 // Note that a linkage-specification sets a storage class, but
2427 // 'extern "C" struct foo;' is actually valid and not theoretically
2429 if (DeclSpec::SCS scs = DS.getStorageClassSpec())
2430 if (!DS.isExternInLinkageSpec())
2431 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier)
2432 << DeclSpec::getSpecifierName(scs);
2434 if (DS.isThreadSpecified())
2435 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread";
2436 if (DS.getTypeQualifiers()) {
2437 if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
2438 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const";
2439 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
2440 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile";
2441 // Restrict is covered above.
2443 if (DS.isInlineSpecified())
2444 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline";
2445 if (DS.isVirtualSpecified())
2446 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual";
2447 if (DS.isExplicitSpecified())
2448 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit";
2450 if (DS.isModulePrivateSpecified() &&
2451 Tag && Tag->getDeclContext()->isFunctionOrMethod())
2452 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class)
2453 << Tag->getTagKind()
2454 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc());
2456 // FIXME: Warn on useless attributes
2461 /// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec.
2462 /// builds a statement for it and returns it so it is evaluated.
2463 StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) {
2465 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) {
2466 Expr *Exp = DS.getRepAsExpr();
2467 QualType Ty = Exp->getType();
2468 if (Ty->isPointerType()) {
2470 Ty = Ty->getAs<PointerType>()->getPointeeType();
2471 while (Ty->isPointerType());
2473 if (Ty->isVariableArrayType()) {
2474 R = ActOnExprStmt(MakeFullExpr(Exp));
2480 /// We are trying to inject an anonymous member into the given scope;
2481 /// check if there's an existing declaration that can't be overloaded.
2483 /// \return true if this is a forbidden redeclaration
2484 static bool CheckAnonMemberRedeclaration(Sema &SemaRef,
2487 DeclarationName Name,
2488 SourceLocation NameLoc,
2489 unsigned diagnostic) {
2490 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName,
2491 Sema::ForRedeclaration);
2492 if (!SemaRef.LookupName(R, S)) return false;
2494 if (R.getAsSingle<TagDecl>())
2497 // Pick a representative declaration.
2498 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl();
2499 assert(PrevDecl && "Expected a non-null Decl");
2501 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S))
2504 SemaRef.Diag(NameLoc, diagnostic) << Name;
2505 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
2510 /// InjectAnonymousStructOrUnionMembers - Inject the members of the
2511 /// anonymous struct or union AnonRecord into the owning context Owner
2512 /// and scope S. This routine will be invoked just after we realize
2513 /// that an unnamed union or struct is actually an anonymous union or
2520 /// }; // InjectAnonymousStructOrUnionMembers called here to inject i and
2521 /// // f into the surrounding scope.x
2524 /// This routine is recursive, injecting the names of nested anonymous
2525 /// structs/unions into the owning context and scope as well.
2526 static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S,
2528 RecordDecl *AnonRecord,
2530 SmallVector<NamedDecl*, 2> &Chaining,
2531 bool MSAnonStruct) {
2533 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl
2534 : diag::err_anonymous_struct_member_redecl;
2536 bool Invalid = false;
2538 // Look every FieldDecl and IndirectFieldDecl with a name.
2539 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(),
2540 DEnd = AnonRecord->decls_end();
2542 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) &&
2543 cast<NamedDecl>(*D)->getDeclName()) {
2544 ValueDecl *VD = cast<ValueDecl>(*D);
2545 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(),
2546 VD->getLocation(), diagKind)) {
2547 // C++ [class.union]p2:
2548 // The names of the members of an anonymous union shall be
2549 // distinct from the names of any other entity in the
2550 // scope in which the anonymous union is declared.
2553 // C++ [class.union]p2:
2554 // For the purpose of name lookup, after the anonymous union
2555 // definition, the members of the anonymous union are
2556 // considered to have been defined in the scope in which the
2557 // anonymous union is declared.
2558 unsigned OldChainingSize = Chaining.size();
2559 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD))
2560 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(),
2561 PE = IF->chain_end(); PI != PE; ++PI)
2562 Chaining.push_back(*PI);
2564 Chaining.push_back(VD);
2566 assert(Chaining.size() >= 2);
2567 NamedDecl **NamedChain =
2568 new (SemaRef.Context)NamedDecl*[Chaining.size()];
2569 for (unsigned i = 0; i < Chaining.size(); i++)
2570 NamedChain[i] = Chaining[i];
2572 IndirectFieldDecl* IndirectField =
2573 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(),
2574 VD->getIdentifier(), VD->getType(),
2575 NamedChain, Chaining.size());
2577 IndirectField->setAccess(AS);
2578 IndirectField->setImplicit();
2579 SemaRef.PushOnScopeChains(IndirectField, S);
2581 // That includes picking up the appropriate access specifier.
2582 if (AS != AS_none) IndirectField->setAccess(AS);
2584 Chaining.resize(OldChainingSize);
2592 /// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to
2593 /// a VarDecl::StorageClass. Any error reporting is up to the caller:
2594 /// illegal input values are mapped to SC_None.
2596 StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) {
2597 switch (StorageClassSpec) {
2598 case DeclSpec::SCS_unspecified: return SC_None;
2599 case DeclSpec::SCS_extern: return SC_Extern;
2600 case DeclSpec::SCS_static: return SC_Static;
2601 case DeclSpec::SCS_auto: return SC_Auto;
2602 case DeclSpec::SCS_register: return SC_Register;
2603 case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
2604 // Illegal SCSs map to None: error reporting is up to the caller.
2605 case DeclSpec::SCS_mutable: // Fall through.
2606 case DeclSpec::SCS_typedef: return SC_None;
2608 llvm_unreachable("unknown storage class specifier");
2611 /// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to
2612 /// a StorageClass. Any error reporting is up to the caller:
2613 /// illegal input values are mapped to SC_None.
2615 StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) {
2616 switch (StorageClassSpec) {
2617 case DeclSpec::SCS_unspecified: return SC_None;
2618 case DeclSpec::SCS_extern: return SC_Extern;
2619 case DeclSpec::SCS_static: return SC_Static;
2620 case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
2621 // Illegal SCSs map to None: error reporting is up to the caller.
2622 case DeclSpec::SCS_auto: // Fall through.
2623 case DeclSpec::SCS_mutable: // Fall through.
2624 case DeclSpec::SCS_register: // Fall through.
2625 case DeclSpec::SCS_typedef: return SC_None;
2627 llvm_unreachable("unknown storage class specifier");
2630 /// BuildAnonymousStructOrUnion - Handle the declaration of an
2631 /// anonymous structure or union. Anonymous unions are a C++ feature
2632 /// (C++ [class.union]) and a GNU C extension; anonymous structures
2633 /// are a GNU C and GNU C++ extension.
2634 Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS,
2636 RecordDecl *Record) {
2637 DeclContext *Owner = Record->getDeclContext();
2639 // Diagnose whether this anonymous struct/union is an extension.
2640 if (Record->isUnion() && !getLangOptions().CPlusPlus)
2641 Diag(Record->getLocation(), diag::ext_anonymous_union);
2642 else if (!Record->isUnion())
2643 Diag(Record->getLocation(), diag::ext_anonymous_struct);
2645 // C and C++ require different kinds of checks for anonymous
2647 bool Invalid = false;
2648 if (getLangOptions().CPlusPlus) {
2649 const char* PrevSpec = 0;
2651 // C++ [class.union]p3:
2652 // Anonymous unions declared in a named namespace or in the
2653 // global namespace shall be declared static.
2654 if (DS.getStorageClassSpec() != DeclSpec::SCS_static &&
2655 (isa<TranslationUnitDecl>(Owner) ||
2656 (isa<NamespaceDecl>(Owner) &&
2657 cast<NamespaceDecl>(Owner)->getDeclName()))) {
2658 Diag(Record->getLocation(), diag::err_anonymous_union_not_static);
2661 // Recover by adding 'static'.
2662 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(),
2665 // C++ [class.union]p3:
2666 // A storage class is not allowed in a declaration of an
2667 // anonymous union in a class scope.
2668 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
2669 isa<RecordDecl>(Owner)) {
2670 Diag(DS.getStorageClassSpecLoc(),
2671 diag::err_anonymous_union_with_storage_spec);
2674 // Recover by removing the storage specifier.
2675 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, SourceLocation(),
2679 // Ignore const/volatile/restrict qualifiers.
2680 if (DS.getTypeQualifiers()) {
2681 if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
2682 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified)
2683 << Record->isUnion() << 0
2684 << FixItHint::CreateRemoval(DS.getConstSpecLoc());
2685 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
2686 Diag(DS.getVolatileSpecLoc(), diag::ext_anonymous_struct_union_qualified)
2687 << Record->isUnion() << 1
2688 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc());
2689 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict)
2690 Diag(DS.getRestrictSpecLoc(), diag::ext_anonymous_struct_union_qualified)
2691 << Record->isUnion() << 2
2692 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc());
2694 DS.ClearTypeQualifiers();
2697 // C++ [class.union]p2:
2698 // The member-specification of an anonymous union shall only
2699 // define non-static data members. [Note: nested types and
2700 // functions cannot be declared within an anonymous union. ]
2701 for (DeclContext::decl_iterator Mem = Record->decls_begin(),
2702 MemEnd = Record->decls_end();
2703 Mem != MemEnd; ++Mem) {
2704 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) {
2705 // C++ [class.union]p3:
2706 // An anonymous union shall not have private or protected
2707 // members (clause 11).
2708 assert(FD->getAccess() != AS_none);
2709 if (FD->getAccess() != AS_public) {
2710 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member)
2711 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected);
2715 // C++ [class.union]p1
2716 // An object of a class with a non-trivial constructor, a non-trivial
2717 // copy constructor, a non-trivial destructor, or a non-trivial copy
2718 // assignment operator cannot be a member of a union, nor can an
2719 // array of such objects.
2720 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(FD))
2722 } else if ((*Mem)->isImplicit()) {
2723 // Any implicit members are fine.
2724 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) {
2725 // This is a type that showed up in an
2726 // elaborated-type-specifier inside the anonymous struct or
2727 // union, but which actually declares a type outside of the
2728 // anonymous struct or union. It's okay.
2729 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) {
2730 if (!MemRecord->isAnonymousStructOrUnion() &&
2731 MemRecord->getDeclName()) {
2732 // Visual C++ allows type definition in anonymous struct or union.
2733 if (getLangOptions().MicrosoftExt)
2734 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type)
2735 << (int)Record->isUnion();
2737 // This is a nested type declaration.
2738 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type)
2739 << (int)Record->isUnion();
2743 } else if (isa<AccessSpecDecl>(*Mem)) {
2744 // Any access specifier is fine.
2746 // We have something that isn't a non-static data
2747 // member. Complain about it.
2748 unsigned DK = diag::err_anonymous_record_bad_member;
2749 if (isa<TypeDecl>(*Mem))
2750 DK = diag::err_anonymous_record_with_type;
2751 else if (isa<FunctionDecl>(*Mem))
2752 DK = diag::err_anonymous_record_with_function;
2753 else if (isa<VarDecl>(*Mem))
2754 DK = diag::err_anonymous_record_with_static;
2756 // Visual C++ allows type definition in anonymous struct or union.
2757 if (getLangOptions().MicrosoftExt &&
2758 DK == diag::err_anonymous_record_with_type)
2759 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type)
2760 << (int)Record->isUnion();
2762 Diag((*Mem)->getLocation(), DK)
2763 << (int)Record->isUnion();
2770 if (!Record->isUnion() && !Owner->isRecord()) {
2771 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member)
2772 << (int)getLangOptions().CPlusPlus;
2776 // Mock up a declarator.
2777 Declarator Dc(DS, Declarator::MemberContext);
2778 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S);
2779 assert(TInfo && "couldn't build declarator info for anonymous struct/union");
2781 // Create a declaration for this anonymous struct/union.
2782 NamedDecl *Anon = 0;
2783 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) {
2784 Anon = FieldDecl::Create(Context, OwningClass,
2785 DS.getSourceRange().getBegin(),
2786 Record->getLocation(),
2787 /*IdentifierInfo=*/0,
2788 Context.getTypeDeclType(Record),
2790 /*BitWidth=*/0, /*Mutable=*/false,
2792 Anon->setAccess(AS);
2793 if (getLangOptions().CPlusPlus)
2794 FieldCollector->Add(cast<FieldDecl>(Anon));
2796 DeclSpec::SCS SCSpec = DS.getStorageClassSpec();
2797 assert(SCSpec != DeclSpec::SCS_typedef &&
2798 "Parser allowed 'typedef' as storage class VarDecl.");
2799 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec);
2800 if (SCSpec == DeclSpec::SCS_mutable) {
2801 // mutable can only appear on non-static class members, so it's always
2803 Diag(Record->getLocation(), diag::err_mutable_nonmember);
2807 SCSpec = DS.getStorageClassSpecAsWritten();
2808 VarDecl::StorageClass SCAsWritten
2809 = StorageClassSpecToVarDeclStorageClass(SCSpec);
2811 Anon = VarDecl::Create(Context, Owner,
2812 DS.getSourceRange().getBegin(),
2813 Record->getLocation(), /*IdentifierInfo=*/0,
2814 Context.getTypeDeclType(Record),
2815 TInfo, SC, SCAsWritten);
2817 // Default-initialize the implicit variable. This initialization will be
2818 // trivial in almost all cases, except if a union member has an in-class
2820 // union { int n = 0; };
2821 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false);
2823 Anon->setImplicit();
2825 // Add the anonymous struct/union object to the current
2826 // context. We'll be referencing this object when we refer to one of
2828 Owner->addDecl(Anon);
2830 // Inject the members of the anonymous struct/union into the owning
2831 // context and into the identifier resolver chain for name lookup
2833 SmallVector<NamedDecl*, 2> Chain;
2834 Chain.push_back(Anon);
2836 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS,
2840 // Mark this as an anonymous struct/union type. Note that we do not
2841 // do this until after we have already checked and injected the
2842 // members of this anonymous struct/union type, because otherwise
2843 // the members could be injected twice: once by DeclContext when it
2844 // builds its lookup table, and once by
2845 // InjectAnonymousStructOrUnionMembers.
2846 Record->setAnonymousStructOrUnion(true);
2849 Anon->setInvalidDecl();
2854 /// BuildMicrosoftCAnonymousStruct - Handle the declaration of an
2855 /// Microsoft C anonymous structure.
2856 /// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx
2859 /// struct A { int a; };
2860 /// struct B { struct A; int b; };
2867 Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS,
2868 RecordDecl *Record) {
2870 // If there is no Record, get the record via the typedef.
2872 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl();
2874 // Mock up a declarator.
2875 Declarator Dc(DS, Declarator::TypeNameContext);
2876 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S);
2877 assert(TInfo && "couldn't build declarator info for anonymous struct");
2879 // Create a declaration for this anonymous struct.
2880 NamedDecl* Anon = FieldDecl::Create(Context,
2881 cast<RecordDecl>(CurContext),
2882 DS.getSourceRange().getBegin(),
2883 DS.getSourceRange().getBegin(),
2884 /*IdentifierInfo=*/0,
2885 Context.getTypeDeclType(Record),
2887 /*BitWidth=*/0, /*Mutable=*/false,
2889 Anon->setImplicit();
2891 // Add the anonymous struct object to the current context.
2892 CurContext->addDecl(Anon);
2894 // Inject the members of the anonymous struct into the current
2895 // context and into the identifier resolver chain for name lookup
2897 SmallVector<NamedDecl*, 2> Chain;
2898 Chain.push_back(Anon);
2900 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext,
2901 Record->getDefinition(),
2902 AS_none, Chain, true))
2903 Anon->setInvalidDecl();
2908 /// GetNameForDeclarator - Determine the full declaration name for the
2909 /// given Declarator.
2910 DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) {
2911 return GetNameFromUnqualifiedId(D.getName());
2914 /// \brief Retrieves the declaration name from a parsed unqualified-id.
2916 Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) {
2917 DeclarationNameInfo NameInfo;
2918 NameInfo.setLoc(Name.StartLocation);
2920 switch (Name.getKind()) {
2922 case UnqualifiedId::IK_ImplicitSelfParam:
2923 case UnqualifiedId::IK_Identifier:
2924 NameInfo.setName(Name.Identifier);
2925 NameInfo.setLoc(Name.StartLocation);
2928 case UnqualifiedId::IK_OperatorFunctionId:
2929 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName(
2930 Name.OperatorFunctionId.Operator));
2931 NameInfo.setLoc(Name.StartLocation);
2932 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc
2933 = Name.OperatorFunctionId.SymbolLocations[0];
2934 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc
2935 = Name.EndLocation.getRawEncoding();
2938 case UnqualifiedId::IK_LiteralOperatorId:
2939 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName(
2941 NameInfo.setLoc(Name.StartLocation);
2942 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation);
2945 case UnqualifiedId::IK_ConversionFunctionId: {
2946 TypeSourceInfo *TInfo;
2947 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo);
2949 return DeclarationNameInfo();
2950 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName(
2951 Context.getCanonicalType(Ty)));
2952 NameInfo.setLoc(Name.StartLocation);
2953 NameInfo.setNamedTypeInfo(TInfo);
2957 case UnqualifiedId::IK_ConstructorName: {
2958 TypeSourceInfo *TInfo;
2959 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo);
2961 return DeclarationNameInfo();
2962 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName(
2963 Context.getCanonicalType(Ty)));
2964 NameInfo.setLoc(Name.StartLocation);
2965 NameInfo.setNamedTypeInfo(TInfo);
2969 case UnqualifiedId::IK_ConstructorTemplateId: {
2970 // In well-formed code, we can only have a constructor
2971 // template-id that refers to the current context, so go there
2972 // to find the actual type being constructed.
2973 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext);
2974 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name)
2975 return DeclarationNameInfo();
2977 // Determine the type of the class being constructed.
2978 QualType CurClassType = Context.getTypeDeclType(CurClass);
2980 // FIXME: Check two things: that the template-id names the same type as
2981 // CurClassType, and that the template-id does not occur when the name
2984 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName(
2985 Context.getCanonicalType(CurClassType)));
2986 NameInfo.setLoc(Name.StartLocation);
2987 // FIXME: should we retrieve TypeSourceInfo?
2988 NameInfo.setNamedTypeInfo(0);
2992 case UnqualifiedId::IK_DestructorName: {
2993 TypeSourceInfo *TInfo;
2994 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo);
2996 return DeclarationNameInfo();
2997 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName(
2998 Context.getCanonicalType(Ty)));
2999 NameInfo.setLoc(Name.StartLocation);
3000 NameInfo.setNamedTypeInfo(TInfo);
3004 case UnqualifiedId::IK_TemplateId: {
3005 TemplateName TName = Name.TemplateId->Template.get();
3006 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc;
3007 return Context.getNameForTemplate(TName, TNameLoc);
3010 } // switch (Name.getKind())
3012 llvm_unreachable("Unknown name kind");
3015 static QualType getCoreType(QualType Ty) {
3017 if (Ty->isPointerType() || Ty->isReferenceType())
3018 Ty = Ty->getPointeeType();
3019 else if (Ty->isArrayType())
3020 Ty = Ty->castAsArrayTypeUnsafe()->getElementType();
3022 return Ty.withoutLocalFastQualifiers();
3026 /// hasSimilarParameters - Determine whether the C++ functions Declaration
3027 /// and Definition have "nearly" matching parameters. This heuristic is
3028 /// used to improve diagnostics in the case where an out-of-line function
3029 /// definition doesn't match any declaration within the class or namespace.
3030 /// Also sets Params to the list of indices to the parameters that differ
3031 /// between the declaration and the definition. If hasSimilarParameters
3032 /// returns true and Params is empty, then all of the parameters match.
3033 static bool hasSimilarParameters(ASTContext &Context,
3034 FunctionDecl *Declaration,
3035 FunctionDecl *Definition,
3036 llvm::SmallVectorImpl<unsigned> &Params) {
3038 if (Declaration->param_size() != Definition->param_size())
3040 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) {
3041 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType();
3042 QualType DefParamTy = Definition->getParamDecl(Idx)->getType();
3044 // The parameter types are identical
3045 if (Context.hasSameType(DefParamTy, DeclParamTy))
3048 QualType DeclParamBaseTy = getCoreType(DeclParamTy);
3049 QualType DefParamBaseTy = getCoreType(DefParamTy);
3050 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier();
3051 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier();
3053 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) ||
3054 (DeclTyName && DeclTyName == DefTyName))
3055 Params.push_back(Idx);
3056 else // The two parameters aren't even close
3063 /// NeedsRebuildingInCurrentInstantiation - Checks whether the given
3064 /// declarator needs to be rebuilt in the current instantiation.
3065 /// Any bits of declarator which appear before the name are valid for
3066 /// consideration here. That's specifically the type in the decl spec
3067 /// and the base type in any member-pointer chunks.
3068 static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D,
3069 DeclarationName Name) {
3070 // The types we specifically need to rebuild are:
3071 // - typenames, typeofs, and decltypes
3072 // - types which will become injected class names
3073 // Of course, we also need to rebuild any type referencing such a
3074 // type. It's safest to just say "dependent", but we call out a
3077 DeclSpec &DS = D.getMutableDeclSpec();
3078 switch (DS.getTypeSpecType()) {
3079 case DeclSpec::TST_typename:
3080 case DeclSpec::TST_typeofType:
3081 case DeclSpec::TST_decltype:
3082 case DeclSpec::TST_underlyingType:
3083 case DeclSpec::TST_atomic: {
3084 // Grab the type from the parser.
3085 TypeSourceInfo *TSI = 0;
3086 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI);
3087 if (T.isNull() || !T->isDependentType()) break;
3089 // Make sure there's a type source info. This isn't really much
3090 // of a waste; most dependent types should have type source info
3091 // attached already.
3093 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc());
3095 // Rebuild the type in the current instantiation.
3096 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name);
3097 if (!TSI) return true;
3099 // Store the new type back in the decl spec.
3100 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI);
3101 DS.UpdateTypeRep(LocType);
3105 case DeclSpec::TST_typeofExpr: {
3106 Expr *E = DS.getRepAsExpr();
3107 ExprResult Result = S.RebuildExprInCurrentInstantiation(E);
3108 if (Result.isInvalid()) return true;
3109 DS.UpdateExprRep(Result.get());
3114 // Nothing to do for these decl specs.
3118 // It doesn't matter what order we do this in.
3119 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) {
3120 DeclaratorChunk &Chunk = D.getTypeObject(I);
3122 // The only type information in the declarator which can come
3123 // before the declaration name is the base type of a member
3125 if (Chunk.Kind != DeclaratorChunk::MemberPointer)
3128 // Rebuild the scope specifier in-place.
3129 CXXScopeSpec &SS = Chunk.Mem.Scope();
3130 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS))
3137 Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) {
3138 D.setFunctionDefinition(false);
3139 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this));
3142 /// DiagnoseClassNameShadow - Implement C++ [class.mem]p13:
3143 /// If T is the name of a class, then each of the following shall have a
3144 /// name different from T:
3145 /// - every static data member of class T;
3146 /// - every member function of class T
3147 /// - every member of class T that is itself a type;
3148 /// \returns true if the declaration name violates these rules.
3149 bool Sema::DiagnoseClassNameShadow(DeclContext *DC,
3150 DeclarationNameInfo NameInfo) {
3151 DeclarationName Name = NameInfo.getName();
3153 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC))
3154 if (Record->getIdentifier() && Record->getDeclName() == Name) {
3155 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name;
3162 Decl *Sema::HandleDeclarator(Scope *S, Declarator &D,
3163 MultiTemplateParamsArg TemplateParamLists) {
3164 // TODO: consider using NameInfo for diagnostic.
3165 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
3166 DeclarationName Name = NameInfo.getName();
3168 // All of these full declarators require an identifier. If it doesn't have
3169 // one, the ParsedFreeStandingDeclSpec action should be used.
3171 if (!D.isInvalidType()) // Reject this if we think it is valid.
3172 Diag(D.getDeclSpec().getSourceRange().getBegin(),
3173 diag::err_declarator_need_ident)
3174 << D.getDeclSpec().getSourceRange() << D.getSourceRange();
3176 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType))
3179 // The scope passed in may not be a decl scope. Zip up the scope tree until
3180 // we find one that is.
3181 while ((S->getFlags() & Scope::DeclScope) == 0 ||
3182 (S->getFlags() & Scope::TemplateParamScope) != 0)
3185 DeclContext *DC = CurContext;
3186 if (D.getCXXScopeSpec().isInvalid())
3188 else if (D.getCXXScopeSpec().isSet()) {
3189 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(),
3190 UPPC_DeclarationQualifier))
3193 bool EnteringContext = !D.getDeclSpec().isFriendSpecified();
3194 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext);
3196 // If we could not compute the declaration context, it's because the
3197 // declaration context is dependent but does not refer to a class,
3198 // class template, or class template partial specialization. Complain
3199 // and return early, to avoid the coming semantic disaster.
3200 Diag(D.getIdentifierLoc(),
3201 diag::err_template_qualified_declarator_no_match)
3202 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep()
3203 << D.getCXXScopeSpec().getRange();
3206 bool IsDependentContext = DC->isDependentContext();
3208 if (!IsDependentContext &&
3209 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC))
3212 if (isa<CXXRecordDecl>(DC)) {
3213 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) {
3214 Diag(D.getIdentifierLoc(),
3215 diag::err_member_def_undefined_record)
3216 << Name << DC << D.getCXXScopeSpec().getRange();
3218 } else if (isa<CXXRecordDecl>(CurContext) &&
3219 !D.getDeclSpec().isFriendSpecified()) {
3220 // The user provided a superfluous scope specifier inside a class
3226 if (CurContext->Equals(DC))
3227 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification)
3228 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange());
3230 Diag(D.getIdentifierLoc(), diag::err_member_qualification)
3231 << Name << D.getCXXScopeSpec().getRange();
3233 // Pretend that this qualifier was not here.
3234 D.getCXXScopeSpec().clear();
3238 // Check whether we need to rebuild the type of the given
3239 // declaration in the current instantiation.
3240 if (EnteringContext && IsDependentContext &&
3241 TemplateParamLists.size() != 0) {
3242 ContextRAII SavedContext(*this, DC);
3243 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name))
3248 if (DiagnoseClassNameShadow(DC, NameInfo))
3249 // If this is a typedef, we'll end up spewing multiple diagnostics.
3250 // Just return early; it's safer.
3251 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
3256 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
3257 QualType R = TInfo->getType();
3259 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
3260 UPPC_DeclarationType))
3263 LookupResult Previous(*this, NameInfo, LookupOrdinaryName,
3266 // See if this is a redefinition of a variable in the same scope.
3267 if (!D.getCXXScopeSpec().isSet()) {
3268 bool IsLinkageLookup = false;
3270 // If the declaration we're planning to build will be a function
3271 // or object with linkage, then look for another declaration with
3272 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6).
3273 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef)
3275 else if (R->isFunctionType()) {
3276 if (CurContext->isFunctionOrMethod() ||
3277 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)
3278 IsLinkageLookup = true;
3279 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern)
3280 IsLinkageLookup = true;
3281 else if (CurContext->getRedeclContext()->isTranslationUnit() &&
3282 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static)
3283 IsLinkageLookup = true;
3285 if (IsLinkageLookup)
3286 Previous.clear(LookupRedeclarationWithLinkage);
3288 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup);
3289 } else { // Something like "int foo::x;"
3290 LookupQualifiedName(Previous, DC);
3292 // Don't consider using declarations as previous declarations for
3293 // out-of-line members.
3294 RemoveUsingDecls(Previous);
3297 // Members (including explicit specializations of templates) of a named
3298 // namespace can also be defined outside that namespace by explicit
3299 // qualification of the name being defined, provided that the entity being
3300 // defined was already declared in the namespace and the definition appears
3301 // after the point of declaration in a namespace that encloses the
3302 // declarations namespace.
3304 // Note that we only check the context at this point. We don't yet
3305 // have enough information to make sure that PrevDecl is actually
3306 // the declaration we want to match. For example, given:
3313 // void X::f(int) { } // ill-formed
3315 // In this case, PrevDecl will point to the overload set
3316 // containing the two f's declared in X, but neither of them
3319 // First check whether we named the global scope.
3320 if (isa<TranslationUnitDecl>(DC)) {
3321 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope)
3322 << Name << D.getCXXScopeSpec().getRange();
3324 DeclContext *Cur = CurContext;
3325 while (isa<LinkageSpecDecl>(Cur))
3326 Cur = Cur->getParent();
3327 if (!Cur->Encloses(DC)) {
3328 // The qualifying scope doesn't enclose the original declaration.
3329 // Emit diagnostic based on current scope.
3330 SourceLocation L = D.getIdentifierLoc();
3331 SourceRange R = D.getCXXScopeSpec().getRange();
3332 if (isa<FunctionDecl>(Cur))
3333 Diag(L, diag::err_invalid_declarator_in_function) << Name << R;
3335 Diag(L, diag::err_invalid_declarator_scope)
3336 << Name << cast<NamedDecl>(DC) << R;
3342 if (Previous.isSingleResult() &&
3343 Previous.getFoundDecl()->isTemplateParameter()) {
3344 // Maybe we will complain about the shadowed template parameter.
3345 if (!D.isInvalidType())
3346 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(),
3347 Previous.getFoundDecl()))
3350 // Just pretend that we didn't see the previous declaration.
3354 // In C++, the previous declaration we find might be a tag type
3355 // (class or enum). In this case, the new declaration will hide the
3356 // tag type. Note that this does does not apply if we're declaring a
3357 // typedef (C++ [dcl.typedef]p4).
3358 if (Previous.isSingleTagDecl() &&
3359 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef)
3362 bool AddToScope = true;
3363 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) {
3364 if (TemplateParamLists.size()) {
3365 Diag(D.getIdentifierLoc(), diag::err_template_typedef);
3369 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous);
3370 } else if (R->isFunctionType()) {
3371 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous,
3372 move(TemplateParamLists),
3375 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous,
3376 move(TemplateParamLists));
3382 // If this has an identifier and is not an invalid redeclaration or
3383 // function template specialization, add it to the scope stack.
3384 if (New->getDeclName() && AddToScope &&
3385 !(D.isRedeclaration() && New->isInvalidDecl()))
3386 PushOnScopeChains(New, S);
3391 /// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array
3392 /// types into constant array types in certain situations which would otherwise
3393 /// be errors (for GCC compatibility).
3394 static QualType TryToFixInvalidVariablyModifiedType(QualType T,
3395 ASTContext &Context,
3396 bool &SizeIsNegative,
3397 llvm::APSInt &Oversized) {
3398 // This method tries to turn a variable array into a constant
3399 // array even when the size isn't an ICE. This is necessary
3400 // for compatibility with code that depends on gcc's buggy
3401 // constant expression folding, like struct {char x[(int)(char*)2];}
3402 SizeIsNegative = false;
3405 if (T->isDependentType())
3408 QualifierCollector Qs;
3409 const Type *Ty = Qs.strip(T);
3411 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) {
3412 QualType Pointee = PTy->getPointeeType();
3413 QualType FixedType =
3414 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative,
3416 if (FixedType.isNull()) return FixedType;
3417 FixedType = Context.getPointerType(FixedType);
3418 return Qs.apply(Context, FixedType);
3420 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) {
3421 QualType Inner = PTy->getInnerType();
3422 QualType FixedType =
3423 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative,
3425 if (FixedType.isNull()) return FixedType;
3426 FixedType = Context.getParenType(FixedType);
3427 return Qs.apply(Context, FixedType);
3430 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T);
3433 // FIXME: We should probably handle this case
3434 if (VLATy->getElementType()->isVariablyModifiedType())
3437 Expr::EvalResult EvalResult;
3438 if (!VLATy->getSizeExpr() ||
3439 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) ||
3440 !EvalResult.Val.isInt())
3443 // Check whether the array size is negative.
3444 llvm::APSInt &Res = EvalResult.Val.getInt();
3445 if (Res.isSigned() && Res.isNegative()) {
3446 SizeIsNegative = true;
3450 // Check whether the array is too large to be addressed.
3451 unsigned ActiveSizeBits
3452 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(),
3454 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) {
3459 return Context.getConstantArrayType(VLATy->getElementType(),
3460 Res, ArrayType::Normal, 0);
3463 /// \brief Register the given locally-scoped external C declaration so
3464 /// that it can be found later for redeclarations
3466 Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND,
3467 const LookupResult &Previous,
3469 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() &&
3470 "Decl is not a locally-scoped decl!");
3471 // Note that we have a locally-scoped external with this name.
3472 LocallyScopedExternalDecls[ND->getDeclName()] = ND;
3474 if (!Previous.isSingleResult())
3477 NamedDecl *PrevDecl = Previous.getFoundDecl();
3479 // If there was a previous declaration of this variable, it may be
3480 // in our identifier chain. Update the identifier chain with the new
3482 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) {
3483 // The previous declaration was found on the identifer resolver
3484 // chain, so remove it from its scope.
3486 if (S->isDeclScope(PrevDecl)) {
3487 // Special case for redeclarations in the SAME scope.
3488 // Because this declaration is going to be added to the identifier chain
3489 // later, we should temporarily take it OFF the chain.
3490 IdResolver.RemoveDecl(ND);
3493 // Find the scope for the original declaration.
3494 while (S && !S->isDeclScope(PrevDecl))
3499 S->RemoveDecl(PrevDecl);
3503 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator
3504 Sema::findLocallyScopedExternalDecl(DeclarationName Name) {
3505 if (ExternalSource) {
3506 // Load locally-scoped external decls from the external source.
3507 SmallVector<NamedDecl *, 4> Decls;
3508 ExternalSource->ReadLocallyScopedExternalDecls(Decls);
3509 for (unsigned I = 0, N = Decls.size(); I != N; ++I) {
3510 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
3511 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName());
3512 if (Pos == LocallyScopedExternalDecls.end())
3513 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I];
3517 return LocallyScopedExternalDecls.find(Name);
3520 /// \brief Diagnose function specifiers on a declaration of an identifier that
3521 /// does not identify a function.
3522 void Sema::DiagnoseFunctionSpecifiers(Declarator& D) {
3523 // FIXME: We should probably indicate the identifier in question to avoid
3524 // confusion for constructs like "inline int a(), b;"
3525 if (D.getDeclSpec().isInlineSpecified())
3526 Diag(D.getDeclSpec().getInlineSpecLoc(),
3527 diag::err_inline_non_function);
3529 if (D.getDeclSpec().isVirtualSpecified())
3530 Diag(D.getDeclSpec().getVirtualSpecLoc(),
3531 diag::err_virtual_non_function);
3533 if (D.getDeclSpec().isExplicitSpecified())
3534 Diag(D.getDeclSpec().getExplicitSpecLoc(),
3535 diag::err_explicit_non_function);
3539 Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC,
3540 TypeSourceInfo *TInfo, LookupResult &Previous) {
3541 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1).
3542 if (D.getCXXScopeSpec().isSet()) {
3543 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator)
3544 << D.getCXXScopeSpec().getRange();
3546 // Pretend we didn't see the scope specifier.
3551 if (getLangOptions().CPlusPlus) {
3552 // Check that there are no default arguments (C++ only).
3553 CheckExtraCXXDefaultArguments(D);
3556 DiagnoseFunctionSpecifiers(D);
3558 if (D.getDeclSpec().isThreadSpecified())
3559 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
3560 if (D.getDeclSpec().isConstexprSpecified())
3561 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr)
3564 if (D.getName().Kind != UnqualifiedId::IK_Identifier) {
3565 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier)
3566 << D.getName().getSourceRange();
3570 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo);
3571 if (!NewTD) return 0;
3573 // Handle attributes prior to checking for duplicates in MergeVarDecl
3574 ProcessDeclAttributes(S, NewTD, D);
3576 CheckTypedefForVariablyModifiedType(S, NewTD);
3578 bool Redeclaration = D.isRedeclaration();
3579 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration);
3580 D.setRedeclaration(Redeclaration);
3585 Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) {
3586 // C99 6.7.7p2: If a typedef name specifies a variably modified type
3587 // then it shall have block scope.
3588 // Note that variably modified types must be fixed before merging the decl so
3589 // that redeclarations will match.
3590 QualType T = NewTD->getUnderlyingType();
3591 if (T->isVariablyModifiedType()) {
3592 getCurFunction()->setHasBranchProtectedScope();
3594 if (S->getFnParent() == 0) {
3595 bool SizeIsNegative;
3596 llvm::APSInt Oversized;
3598 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative,
3600 if (!FixedTy.isNull()) {
3601 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size);
3602 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy));
3605 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size);
3606 else if (T->isVariableArrayType())
3607 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope);
3608 else if (Oversized.getBoolValue())
3609 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10);
3611 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope);
3612 NewTD->setInvalidDecl();
3619 /// ActOnTypedefNameDecl - Perform semantic checking for a declaration which
3620 /// declares a typedef-name, either using the 'typedef' type specifier or via
3621 /// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'.
3623 Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD,
3624 LookupResult &Previous, bool &Redeclaration) {
3625 // Merge the decl with the existing one if appropriate. If the decl is
3626 // in an outer scope, it isn't the same thing.
3627 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false,
3628 /*ExplicitInstantiationOrSpecialization=*/false);
3629 if (!Previous.empty()) {
3630 Redeclaration = true;
3631 MergeTypedefNameDecl(NewTD, Previous);
3634 // If this is the C FILE type, notify the AST context.
3635 if (IdentifierInfo *II = NewTD->getIdentifier())
3636 if (!NewTD->isInvalidDecl() &&
3637 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) {
3638 if (II->isStr("FILE"))
3639 Context.setFILEDecl(NewTD);
3640 else if (II->isStr("jmp_buf"))
3641 Context.setjmp_bufDecl(NewTD);
3642 else if (II->isStr("sigjmp_buf"))
3643 Context.setsigjmp_bufDecl(NewTD);
3644 else if (II->isStr("ucontext_t"))
3645 Context.setucontext_tDecl(NewTD);
3646 else if (II->isStr("__builtin_va_list"))
3647 Context.setBuiltinVaListType(Context.getTypedefType(NewTD));
3653 /// \brief Determines whether the given declaration is an out-of-scope
3654 /// previous declaration.
3656 /// This routine should be invoked when name lookup has found a
3657 /// previous declaration (PrevDecl) that is not in the scope where a
3658 /// new declaration by the same name is being introduced. If the new
3659 /// declaration occurs in a local scope, previous declarations with
3660 /// linkage may still be considered previous declarations (C99
3661 /// 6.2.2p4-5, C++ [basic.link]p6).
3663 /// \param PrevDecl the previous declaration found by name
3666 /// \param DC the context in which the new declaration is being
3669 /// \returns true if PrevDecl is an out-of-scope previous declaration
3670 /// for a new delcaration with the same name.
3672 isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC,
3673 ASTContext &Context) {
3677 if (!PrevDecl->hasLinkage())
3680 if (Context.getLangOptions().CPlusPlus) {
3681 // C++ [basic.link]p6:
3682 // If there is a visible declaration of an entity with linkage
3683 // having the same name and type, ignoring entities declared
3684 // outside the innermost enclosing namespace scope, the block
3685 // scope declaration declares that same entity and receives the
3686 // linkage of the previous declaration.
3687 DeclContext *OuterContext = DC->getRedeclContext();
3688 if (!OuterContext->isFunctionOrMethod())
3689 // This rule only applies to block-scope declarations.
3692 DeclContext *PrevOuterContext = PrevDecl->getDeclContext();
3693 if (PrevOuterContext->isRecord())
3694 // We found a member function: ignore it.
3697 // Find the innermost enclosing namespace for the new and
3698 // previous declarations.
3699 OuterContext = OuterContext->getEnclosingNamespaceContext();
3700 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext();
3702 // The previous declaration is in a different namespace, so it
3703 // isn't the same function.
3704 if (!OuterContext->Equals(PrevOuterContext))
3711 static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) {
3712 CXXScopeSpec &SS = D.getCXXScopeSpec();
3713 if (!SS.isSet()) return;
3714 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext()));
3717 bool Sema::inferObjCARCLifetime(ValueDecl *decl) {
3718 QualType type = decl->getType();
3719 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime();
3720 if (lifetime == Qualifiers::OCL_Autoreleasing) {
3721 // Various kinds of declaration aren't allowed to be __autoreleasing.
3722 unsigned kind = -1U;
3723 if (VarDecl *var = dyn_cast<VarDecl>(decl)) {
3724 if (var->hasAttr<BlocksAttr>())
3725 kind = 0; // __block
3726 else if (!var->hasLocalStorage())
3728 } else if (isa<ObjCIvarDecl>(decl)) {
3730 } else if (isa<FieldDecl>(decl)) {
3735 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var)
3738 } else if (lifetime == Qualifiers::OCL_None) {
3739 // Try to infer lifetime.
3740 if (!type->isObjCLifetimeType())
3743 lifetime = type->getObjCARCImplicitLifetime();
3744 type = Context.getLifetimeQualifiedType(type, lifetime);
3745 decl->setType(type);
3748 if (VarDecl *var = dyn_cast<VarDecl>(decl)) {
3749 // Thread-local variables cannot have lifetime.
3750 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone &&
3751 var->isThreadSpecified()) {
3752 Diag(var->getLocation(), diag::err_arc_thread_ownership)
3762 Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC,
3763 TypeSourceInfo *TInfo, LookupResult &Previous,
3764 MultiTemplateParamsArg TemplateParamLists) {
3765 QualType R = TInfo->getType();
3766 DeclarationName Name = GetNameForDeclarator(D).getName();
3768 // Check that there are no default arguments (C++ only).
3769 if (getLangOptions().CPlusPlus)
3770 CheckExtraCXXDefaultArguments(D);
3772 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec();
3773 assert(SCSpec != DeclSpec::SCS_typedef &&
3774 "Parser allowed 'typedef' as storage class VarDecl.");
3775 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec);
3776 if (SCSpec == DeclSpec::SCS_mutable) {
3777 // mutable can only appear on non-static class members, so it's always
3779 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember);
3783 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten();
3784 VarDecl::StorageClass SCAsWritten
3785 = StorageClassSpecToVarDeclStorageClass(SCSpec);
3787 IdentifierInfo *II = Name.getAsIdentifierInfo();
3789 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name)
3794 DiagnoseFunctionSpecifiers(D);
3796 if (!DC->isRecord() && S->getFnParent() == 0) {
3797 // C99 6.9p2: The storage-class specifiers auto and register shall not
3798 // appear in the declaration specifiers in an external declaration.
3799 if (SC == SC_Auto || SC == SC_Register) {
3801 // If this is a register variable with an asm label specified, then this
3802 // is a GNU extension.
3803 if (SC == SC_Register && D.getAsmLabel())
3804 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register);
3806 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope);
3811 if (getLangOptions().OpenCL) {
3812 // Set up the special work-group-local storage class for variables in the
3813 // OpenCL __local address space.
3814 if (R.getAddressSpace() == LangAS::opencl_local)
3815 SC = SC_OpenCLWorkGroupLocal;
3818 bool isExplicitSpecialization = false;
3820 if (!getLangOptions().CPlusPlus) {
3821 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(),
3822 D.getIdentifierLoc(), II,
3823 R, TInfo, SC, SCAsWritten);
3825 if (D.isInvalidType())
3826 NewVD->setInvalidDecl();
3828 if (DC->isRecord() && !CurContext->isRecord()) {
3829 // This is an out-of-line definition of a static data member.
3830 if (SC == SC_Static) {
3831 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
3832 diag::err_static_out_of_line)
3833 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
3834 } else if (SC == SC_None)
3837 if (SC == SC_Static) {
3838 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) {
3839 if (RD->isLocalClass())
3840 Diag(D.getIdentifierLoc(),
3841 diag::err_static_data_member_not_allowed_in_local_class)
3842 << Name << RD->getDeclName();
3844 // C++ [class.union]p1: If a union contains a static data member,
3845 // the program is ill-formed.
3847 // We also disallow static data members in anonymous structs.
3848 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName()))
3849 Diag(D.getIdentifierLoc(),
3850 diag::err_static_data_member_not_allowed_in_union_or_anon_struct)
3851 << Name << RD->isUnion();
3855 // Match up the template parameter lists with the scope specifier, then
3856 // determine whether we have a template or a template specialization.
3857 isExplicitSpecialization = false;
3858 bool Invalid = false;
3859 if (TemplateParameterList *TemplateParams
3860 = MatchTemplateParametersToScopeSpecifier(
3861 D.getDeclSpec().getSourceRange().getBegin(),
3862 D.getIdentifierLoc(),
3863 D.getCXXScopeSpec(),
3864 TemplateParamLists.get(),
3865 TemplateParamLists.size(),
3866 /*never a friend*/ false,
3867 isExplicitSpecialization,
3869 if (TemplateParams->size() > 0) {
3870 // There is no such thing as a variable template.
3871 Diag(D.getIdentifierLoc(), diag::err_template_variable)
3873 << SourceRange(TemplateParams->getTemplateLoc(),
3874 TemplateParams->getRAngleLoc());
3877 // There is an extraneous 'template<>' for this variable. Complain
3878 // about it, but allow the declaration of the variable.
3879 Diag(TemplateParams->getTemplateLoc(),
3880 diag::err_template_variable_noparams)
3882 << SourceRange(TemplateParams->getTemplateLoc(),
3883 TemplateParams->getRAngleLoc());
3887 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(),
3888 D.getIdentifierLoc(), II,
3889 R, TInfo, SC, SCAsWritten);
3891 // If this decl has an auto type in need of deduction, make a note of the
3892 // Decl so we can diagnose uses of it in its own initializer.
3893 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto &&
3894 R->getContainedAutoType())
3895 ParsingInitForAutoVars.insert(NewVD);
3897 if (D.isInvalidType() || Invalid)
3898 NewVD->setInvalidDecl();
3900 SetNestedNameSpecifier(NewVD, D);
3902 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) {
3903 NewVD->setTemplateParameterListsInfo(Context,
3904 TemplateParamLists.size(),
3905 TemplateParamLists.release());
3908 if (D.getDeclSpec().isConstexprSpecified()) {
3909 // FIXME: once we know whether there's an initializer, apply this to
3910 // static data members too.
3911 if (!NewVD->isStaticDataMember() &&
3912 !NewVD->isThisDeclarationADefinition()) {
3913 // 'constexpr' is redundant and ill-formed on a non-defining declaration
3914 // of a variable. Suggest replacing it with 'const' if appropriate.
3915 SourceLocation ConstexprLoc = D.getDeclSpec().getConstexprSpecLoc();
3916 SourceRange ConstexprRange(ConstexprLoc, ConstexprLoc);
3917 // If the declarator is complex, we need to move the keyword to the
3918 // innermost chunk as we switch it from 'constexpr' to 'const'.
3919 int Kind = DeclaratorChunk::Paren;
3920 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) {
3921 Kind = D.getTypeObject(I).Kind;
3922 if (Kind != DeclaratorChunk::Paren)
3925 if ((D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) ||
3926 Kind == DeclaratorChunk::Reference)
3927 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl)
3928 << FixItHint::CreateRemoval(ConstexprRange);
3929 else if (Kind == DeclaratorChunk::Paren)
3930 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl)
3931 << FixItHint::CreateReplacement(ConstexprRange, "const");
3933 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl)
3934 << FixItHint::CreateRemoval(ConstexprRange)
3935 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "const ");
3937 NewVD->setConstexpr(true);
3942 // Set the lexical context. If the declarator has a C++ scope specifier, the
3943 // lexical context will be different from the semantic context.
3944 NewVD->setLexicalDeclContext(CurContext);
3946 if (D.getDeclSpec().isThreadSpecified()) {
3947 if (NewVD->hasLocalStorage())
3948 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global);
3949 else if (!Context.getTargetInfo().isTLSSupported())
3950 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported);
3952 NewVD->setThreadSpecified(true);
3955 if (D.getDeclSpec().isModulePrivateSpecified()) {
3956 if (isExplicitSpecialization)
3957 Diag(NewVD->getLocation(), diag::err_module_private_specialization)
3959 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
3960 else if (NewVD->hasLocalStorage())
3961 Diag(NewVD->getLocation(), diag::err_module_private_local)
3962 << 0 << NewVD->getDeclName()
3963 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
3964 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
3966 NewVD->setModulePrivate();
3969 // Handle attributes prior to checking for duplicates in MergeVarDecl
3970 ProcessDeclAttributes(S, NewVD, D);
3972 // In auto-retain/release, infer strong retension for variables of
3974 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD))
3975 NewVD->setInvalidDecl();
3977 // Handle GNU asm-label extension (encoded as an attribute).
3978 if (Expr *E = (Expr*)D.getAsmLabel()) {
3979 // The parser guarantees this is a string.
3980 StringLiteral *SE = cast<StringLiteral>(E);
3981 StringRef Label = SE->getString();
3982 if (S->getFnParent() != 0) {
3986 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label;
3989 if (!Context.getTargetInfo().isValidGCCRegisterName(Label))
3990 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label;
3994 case SC_PrivateExtern:
3995 case SC_OpenCLWorkGroupLocal:
4000 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0),
4004 // Diagnose shadowed variables before filtering for scope.
4005 if (!D.getCXXScopeSpec().isSet())
4006 CheckShadow(S, NewVD, Previous);
4008 // Don't consider existing declarations that are in a different
4009 // scope and are out-of-semantic-context declarations (if the new
4010 // declaration has linkage).
4011 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(),
4012 isExplicitSpecialization);
4014 if (!getLangOptions().CPlusPlus) {
4015 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous));
4017 // Merge the decl with the existing one if appropriate.
4018 if (!Previous.empty()) {
4019 if (Previous.isSingleResult() &&
4020 isa<FieldDecl>(Previous.getFoundDecl()) &&
4021 D.getCXXScopeSpec().isSet()) {
4022 // The user tried to define a non-static data member
4023 // out-of-line (C++ [dcl.meaning]p1).
4024 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line)
4025 << D.getCXXScopeSpec().getRange();
4027 NewVD->setInvalidDecl();
4029 } else if (D.getCXXScopeSpec().isSet()) {
4030 // No previous declaration in the qualifying scope.
4031 Diag(D.getIdentifierLoc(), diag::err_no_member)
4032 << Name << computeDeclContext(D.getCXXScopeSpec(), true)
4033 << D.getCXXScopeSpec().getRange();
4034 NewVD->setInvalidDecl();
4037 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous));
4039 // This is an explicit specialization of a static data member. Check it.
4040 if (isExplicitSpecialization && !NewVD->isInvalidDecl() &&
4041 CheckMemberSpecialization(NewVD, Previous))
4042 NewVD->setInvalidDecl();
4045 // attributes declared post-definition are currently ignored
4046 // FIXME: This should be handled in attribute merging, not
4048 if (Previous.isSingleResult()) {
4049 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl());
4050 if (Def && (Def = Def->getDefinition()) &&
4051 Def != NewVD && D.hasAttributes()) {
4052 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition);
4053 Diag(Def->getLocation(), diag::note_previous_definition);
4057 // If this is a locally-scoped extern C variable, update the map of
4059 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() &&
4060 !NewVD->isInvalidDecl())
4061 RegisterLocallyScopedExternCDecl(NewVD, Previous, S);
4063 // If there's a #pragma GCC visibility in scope, and this isn't a class
4064 // member, set the visibility of this variable.
4065 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord())
4066 AddPushedVisibilityAttribute(NewVD);
4068 MarkUnusedFileScopedDecl(NewVD);
4073 /// \brief Diagnose variable or built-in function shadowing. Implements
4076 /// This method is called whenever a VarDecl is added to a "useful"
4079 /// \param S the scope in which the shadowing name is being declared
4080 /// \param R the lookup of the name
4082 void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) {
4083 // Return if warning is ignored.
4084 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) ==
4085 DiagnosticsEngine::Ignored)
4088 // Don't diagnose declarations at file scope.
4089 if (D->hasGlobalStorage())
4092 DeclContext *NewDC = D->getDeclContext();
4094 // Only diagnose if we're shadowing an unambiguous field or variable.
4095 if (R.getResultKind() != LookupResult::Found)
4098 NamedDecl* ShadowedDecl = R.getFoundDecl();
4099 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl))
4102 // Fields are not shadowed by variables in C++ static methods.
4103 if (isa<FieldDecl>(ShadowedDecl))
4104 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC))
4108 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl))
4109 if (shadowedVar->isExternC()) {
4110 // For shadowing external vars, make sure that we point to the global
4111 // declaration, not a locally scoped extern declaration.
4112 for (VarDecl::redecl_iterator
4113 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end();
4115 if (I->isFileVarDecl()) {
4121 DeclContext *OldDC = ShadowedDecl->getDeclContext();
4123 // Only warn about certain kinds of shadowing for class members.
4124 if (NewDC && NewDC->isRecord()) {
4125 // In particular, don't warn about shadowing non-class members.
4126 if (!OldDC->isRecord())
4129 // TODO: should we warn about static data members shadowing
4130 // static data members from base classes?
4132 // TODO: don't diagnose for inaccessible shadowed members.
4133 // This is hard to do perfectly because we might friend the
4134 // shadowing context, but that's just a false negative.
4137 // Determine what kind of declaration we're shadowing.
4139 if (isa<RecordDecl>(OldDC)) {
4140 if (isa<FieldDecl>(ShadowedDecl))
4143 Kind = 2; // static data member
4144 } else if (OldDC->isFileContext())
4149 DeclarationName Name = R.getLookupName();
4151 // Emit warning and note.
4152 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC;
4153 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration);
4156 /// \brief Check -Wshadow without the advantage of a previous lookup.
4157 void Sema::CheckShadow(Scope *S, VarDecl *D) {
4158 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) ==
4159 DiagnosticsEngine::Ignored)
4162 LookupResult R(*this, D->getDeclName(), D->getLocation(),
4163 Sema::LookupOrdinaryName, Sema::ForRedeclaration);
4165 CheckShadow(S, D, R);
4168 /// \brief Perform semantic checking on a newly-created variable
4171 /// This routine performs all of the type-checking required for a
4172 /// variable declaration once it has been built. It is used both to
4173 /// check variables after they have been parsed and their declarators
4174 /// have been translated into a declaration, and to check variables
4175 /// that have been instantiated from a template.
4177 /// Sets NewVD->isInvalidDecl() if an error was encountered.
4179 /// Returns true if the variable declaration is a redeclaration.
4180 bool Sema::CheckVariableDeclaration(VarDecl *NewVD,
4181 LookupResult &Previous) {
4182 // If the decl is already known invalid, don't check it.
4183 if (NewVD->isInvalidDecl())
4186 QualType T = NewVD->getType();
4188 if (T->isObjCObjectType()) {
4189 Diag(NewVD->getLocation(), diag::err_statically_allocated_object)
4190 << FixItHint::CreateInsertion(NewVD->getLocation(), "*");
4191 T = Context.getObjCObjectPointerType(T);
4195 // Emit an error if an address space was applied to decl with local storage.
4196 // This includes arrays of objects with address space qualifiers, but not
4197 // automatic variables that point to other address spaces.
4198 // ISO/IEC TR 18037 S5.1.2
4199 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) {
4200 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl);
4201 NewVD->setInvalidDecl();
4205 if (NewVD->hasLocalStorage() && T.isObjCGCWeak()
4206 && !NewVD->hasAttr<BlocksAttr>()) {
4207 if (getLangOptions().getGC() != LangOptions::NonGC)
4208 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local);
4210 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local);
4213 bool isVM = T->isVariablyModifiedType();
4214 if (isVM || NewVD->hasAttr<CleanupAttr>() ||
4215 NewVD->hasAttr<BlocksAttr>())
4216 getCurFunction()->setHasBranchProtectedScope();
4218 if ((isVM && NewVD->hasLinkage()) ||
4219 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) {
4220 bool SizeIsNegative;
4221 llvm::APSInt Oversized;
4223 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative,
4226 if (FixedTy.isNull() && T->isVariableArrayType()) {
4227 const VariableArrayType *VAT = Context.getAsVariableArrayType(T);
4228 // FIXME: This won't give the correct result for
4230 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange();
4232 if (NewVD->isFileVarDecl())
4233 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope)
4235 else if (NewVD->getStorageClass() == SC_Static)
4236 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage)
4239 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage)
4241 NewVD->setInvalidDecl();
4245 if (FixedTy.isNull()) {
4246 if (NewVD->isFileVarDecl())
4247 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope);
4249 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage);
4250 NewVD->setInvalidDecl();
4254 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size);
4255 NewVD->setType(FixedTy);
4258 if (Previous.empty() && NewVD->isExternC()) {
4259 // Since we did not find anything by this name and we're declaring
4260 // an extern "C" variable, look for a non-visible extern "C"
4261 // declaration with the same name.
4262 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
4263 = findLocallyScopedExternalDecl(NewVD->getDeclName());
4264 if (Pos != LocallyScopedExternalDecls.end())
4265 Previous.addDecl(Pos->second);
4268 if (T->isVoidType() && !NewVD->hasExternalStorage()) {
4269 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type)
4271 NewVD->setInvalidDecl();
4275 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) {
4276 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal);
4277 NewVD->setInvalidDecl();
4281 if (isVM && NewVD->hasAttr<BlocksAttr>()) {
4282 Diag(NewVD->getLocation(), diag::err_block_on_vm);
4283 NewVD->setInvalidDecl();
4287 // Function pointers and references cannot have qualified function type, only
4288 // function pointer-to-members can do that.
4290 unsigned PtrOrRef = 0;
4291 if (const PointerType *Ptr = T->getAs<PointerType>())
4292 Pointee = Ptr->getPointeeType();
4293 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) {
4294 Pointee = Ref->getPointeeType();
4297 if (!Pointee.isNull() && Pointee->isFunctionProtoType() &&
4298 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) {
4299 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer)
4301 NewVD->setInvalidDecl();
4305 if (!Previous.empty()) {
4306 MergeVarDecl(NewVD, Previous);
4312 /// \brief Data used with FindOverriddenMethod
4313 struct FindOverriddenMethodData {
4315 CXXMethodDecl *Method;
4318 /// \brief Member lookup function that determines whether a given C++
4319 /// method overrides a method in a base class, to be used with
4320 /// CXXRecordDecl::lookupInBases().
4321 static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier,
4324 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl();
4326 FindOverriddenMethodData *Data
4327 = reinterpret_cast<FindOverriddenMethodData*>(UserData);
4329 DeclarationName Name = Data->Method->getDeclName();
4331 // FIXME: Do we care about other names here too?
4332 if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
4333 // We really want to find the base class destructor here.
4334 QualType T = Data->S->Context.getTypeDeclType(BaseRecord);
4335 CanQualType CT = Data->S->Context.getCanonicalType(T);
4337 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT);
4340 for (Path.Decls = BaseRecord->lookup(Name);
4341 Path.Decls.first != Path.Decls.second;
4342 ++Path.Decls.first) {
4343 NamedDecl *D = *Path.Decls.first;
4344 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
4345 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false))
4353 /// AddOverriddenMethods - See if a method overrides any in the base classes,
4354 /// and if so, check that it's a valid override and remember it.
4355 bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) {
4356 // Look for virtual methods in base classes that this method might override.
4358 FindOverriddenMethodData Data;
4361 bool AddedAny = false;
4362 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) {
4363 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(),
4364 E = Paths.found_decls_end(); I != E; ++I) {
4365 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) {
4366 MD->addOverriddenMethod(OldMD->getCanonicalDecl());
4367 if (!CheckOverridingFunctionReturnType(MD, OldMD) &&
4368 !CheckOverridingFunctionExceptionSpec(MD, OldMD) &&
4369 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) {
4380 // Struct for holding all of the extra arguments needed by
4381 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator.
4382 struct ActOnFDArgs {
4385 MultiTemplateParamsArg TemplateParamLists;
4390 /// \brief Generate diagnostics for an invalid function redeclaration.
4392 /// This routine handles generating the diagnostic messages for an invalid
4393 /// function redeclaration, including finding possible similar declarations
4394 /// or performing typo correction if there are no previous declarations with
4397 /// Returns a NamedDecl iff typo correction was performed and substituting in
4398 /// the new declaration name does not cause new errors.
4399 static NamedDecl* DiagnoseInvalidRedeclaration(
4400 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD,
4401 ActOnFDArgs &ExtraArgs) {
4402 NamedDecl *Result = NULL;
4403 DeclarationName Name = NewFD->getDeclName();
4404 DeclContext *NewDC = NewFD->getDeclContext();
4405 LookupResult Prev(SemaRef, Name, NewFD->getLocation(),
4406 Sema::LookupOrdinaryName, Sema::ForRedeclaration);
4407 llvm::SmallVector<unsigned, 1> MismatchedParams;
4408 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches;
4409 TypoCorrection Correction;
4410 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus &&
4411 ExtraArgs.D.getDeclSpec().isFriendSpecified());
4412 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend
4413 : diag::err_member_def_does_not_match;
4415 NewFD->setInvalidDecl();
4416 SemaRef.LookupQualifiedName(Prev, NewDC);
4417 assert(!Prev.isAmbiguous() &&
4418 "Cannot have an ambiguity in previous-declaration lookup");
4419 if (!Prev.empty()) {
4420 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end();
4421 Func != FuncEnd; ++Func) {
4422 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func);
4424 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) {
4425 // Add 1 to the index so that 0 can mean the mismatch didn't
4426 // involve a parameter
4428 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1;
4429 NearMatches.push_back(std::make_pair(FD, ParamNum));
4432 // If the qualified name lookup yielded nothing, try typo correction
4433 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(),
4434 Prev.getLookupKind(), 0, 0, NewDC)) &&
4435 Correction.getCorrection() != Name) {
4437 Sema::SFINAETrap Trap(SemaRef);
4439 // Set up everything for the call to ActOnFunctionDeclarator
4440 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(),
4441 ExtraArgs.D.getIdentifierLoc());
4443 Previous.setLookupName(Correction.getCorrection());
4444 for (TypoCorrection::decl_iterator CDecl = Correction.begin(),
4445 CDeclEnd = Correction.end();
4446 CDecl != CDeclEnd; ++CDecl) {
4447 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl);
4448 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD,
4449 MismatchedParams)) {
4450 Previous.addDecl(FD);
4453 bool wasRedeclaration = ExtraArgs.D.isRedeclaration();
4454 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the
4455 // pieces need to verify the typo-corrected C++ declaraction and hopefully
4456 // eliminate the need for the parameter pack ExtraArgs.
4457 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D,
4458 NewFD->getDeclContext(),
4459 NewFD->getTypeSourceInfo(),
4461 ExtraArgs.TemplateParamLists,
4462 ExtraArgs.AddToScope);
4463 if (Trap.hasErrorOccurred()) {
4464 // Pretend the typo correction never occurred
4465 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(),
4466 ExtraArgs.D.getIdentifierLoc());
4467 ExtraArgs.D.setRedeclaration(wasRedeclaration);
4469 Previous.setLookupName(Name);
4472 for (LookupResult::iterator Func = Previous.begin(),
4473 FuncEnd = Previous.end();
4474 Func != FuncEnd; ++Func) {
4475 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func))
4476 NearMatches.push_back(std::make_pair(FD, 0));
4479 if (NearMatches.empty()) {
4480 // Ignore the correction if it didn't yield any close FunctionDecl matches
4481 Correction = TypoCorrection();
4483 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest
4484 : diag::err_member_def_does_not_match_suggest;
4489 SemaRef.Diag(NewFD->getLocation(), DiagMsg)
4490 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions())
4491 << FixItHint::CreateReplacement(
4492 NewFD->getLocation(),
4493 Correction.getAsString(SemaRef.getLangOptions()));
4495 SemaRef.Diag(NewFD->getLocation(), DiagMsg)
4496 << Name << NewDC << NewFD->getLocation();
4498 bool NewFDisConst = false;
4499 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD))
4500 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const;
4502 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator
4503 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end();
4504 NearMatch != NearMatchEnd; ++NearMatch) {
4505 FunctionDecl *FD = NearMatch->first;
4506 bool FDisConst = false;
4507 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD))
4508 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const;
4510 if (unsigned Idx = NearMatch->second) {
4511 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1);
4512 SemaRef.Diag(FDParam->getTypeSpecStartLoc(),
4513 diag::note_member_def_close_param_match)
4514 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType();
4515 } else if (Correction) {
4516 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl)
4517 << Correction.getQuoted(SemaRef.getLangOptions());
4518 } else if (FDisConst != NewFDisConst) {
4519 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match)
4520 << NewFDisConst << FD->getSourceRange().getEnd();
4522 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match);
4527 static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, Declarator &D) {
4528 switch (D.getDeclSpec().getStorageClassSpec()) {
4529 default: llvm_unreachable("Unknown storage class!");
4530 case DeclSpec::SCS_auto:
4531 case DeclSpec::SCS_register:
4532 case DeclSpec::SCS_mutable:
4533 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(),
4534 diag::err_typecheck_sclass_func);
4537 case DeclSpec::SCS_unspecified: break;
4538 case DeclSpec::SCS_extern: return SC_Extern;
4539 case DeclSpec::SCS_static: {
4540 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) {
4542 // The declaration of an identifier for a function that has
4543 // block scope shall have no explicit storage-class specifier
4544 // other than extern
4545 // See also (C++ [dcl.stc]p4).
4546 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(),
4547 diag::err_static_block_func);
4552 case DeclSpec::SCS_private_extern: return SC_PrivateExtern;
4555 // No explicit storage class has already been returned
4559 static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D,
4560 DeclContext *DC, QualType &R,
4561 TypeSourceInfo *TInfo,
4562 FunctionDecl::StorageClass SC,
4563 bool &IsVirtualOkay) {
4564 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D);
4565 DeclarationName Name = NameInfo.getName();
4567 FunctionDecl *NewFD = 0;
4568 bool isInline = D.getDeclSpec().isInlineSpecified();
4569 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten();
4570 FunctionDecl::StorageClass SCAsWritten
4571 = StorageClassSpecToFunctionDeclStorageClass(SCSpec);
4573 if (!SemaRef.getLangOptions().CPlusPlus) {
4574 // Determine whether the function was written with a
4575 // prototype. This true when:
4576 // - there is a prototype in the declarator, or
4577 // - the type R of the function is some kind of typedef or other reference
4578 // to a type name (which eventually refers to a function type).
4580 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) ||
4581 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType());
4583 NewFD = FunctionDecl::Create(SemaRef.Context, DC, D.getSourceRange().getBegin(),
4584 NameInfo, R, TInfo, SC, SCAsWritten, isInline,
4586 if (D.isInvalidType())
4587 NewFD->setInvalidDecl();
4589 // Set the lexical context.
4590 NewFD->setLexicalDeclContext(SemaRef.CurContext);
4595 bool isExplicit = D.getDeclSpec().isExplicitSpecified();
4596 bool isConstexpr = D.getDeclSpec().isConstexprSpecified();
4598 // Check that the return type is not an abstract class type.
4599 // For record types, this is done by the AbstractClassUsageDiagnoser once
4600 // the class has been completely parsed.
4601 if (!DC->isRecord() &&
4602 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(),
4603 R->getAs<FunctionType>()->getResultType(),
4604 diag::err_abstract_type_in_decl,
4605 SemaRef.AbstractReturnType))
4608 if (Name.getNameKind() == DeclarationName::CXXConstructorName) {
4609 // This is a C++ constructor declaration.
4610 assert(DC->isRecord() &&
4611 "Constructors can only be declared in a member context");
4613 R = SemaRef.CheckConstructorDeclarator(D, R, SC);
4614 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC),
4615 D.getSourceRange().getBegin(), NameInfo,
4616 R, TInfo, isExplicit, isInline,
4617 /*isImplicitlyDeclared=*/false,
4620 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
4621 // This is a C++ destructor declaration.
4622 if (DC->isRecord()) {
4623 R = SemaRef.CheckDestructorDeclarator(D, R, SC);
4624 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC);
4625 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(
4626 SemaRef.Context, Record,
4627 D.getSourceRange().getBegin(),
4628 NameInfo, R, TInfo, isInline,
4629 /*isImplicitlyDeclared=*/false);
4631 // If the class is complete, then we now create the implicit exception
4632 // specification. If the class is incomplete or dependent, we can't do
4634 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() &&
4635 Record->getDefinition() && !Record->isBeingDefined() &&
4636 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) {
4637 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD);
4640 IsVirtualOkay = true;
4644 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member);
4647 // Create a FunctionDecl to satisfy the function definition parsing
4649 return FunctionDecl::Create(SemaRef.Context, DC,
4650 D.getSourceRange().getBegin(),
4651 D.getIdentifierLoc(), Name, R, TInfo,
4652 SC, SCAsWritten, isInline,
4653 /*hasPrototype=*/true, isConstexpr);
4656 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
4657 if (!DC->isRecord()) {
4658 SemaRef.Diag(D.getIdentifierLoc(),
4659 diag::err_conv_function_not_member);
4663 SemaRef.CheckConversionDeclarator(D, R, SC);
4664 IsVirtualOkay = true;
4665 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC),
4666 D.getSourceRange().getBegin(), NameInfo,
4667 R, TInfo, isInline, isExplicit,
4668 isConstexpr, SourceLocation());
4670 } else if (DC->isRecord()) {
4671 // If the name of the function is the same as the name of the record,
4672 // then this must be an invalid constructor that has a return type.
4673 // (The parser checks for a return type and makes the declarator a
4674 // constructor if it has no return type).
4675 if (Name.getAsIdentifierInfo() &&
4676 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){
4677 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type)
4678 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc())
4679 << SourceRange(D.getIdentifierLoc());
4683 bool isStatic = SC == SC_Static;
4686 // Any allocation function for a class T is a static member
4687 // (even if not explicitly declared static).
4688 if (Name.getCXXOverloadedOperator() == OO_New ||
4689 Name.getCXXOverloadedOperator() == OO_Array_New)
4692 // [class.free]p6 Any deallocation function for a class X is a static member
4693 // (even if not explicitly declared static).
4694 if (Name.getCXXOverloadedOperator() == OO_Delete ||
4695 Name.getCXXOverloadedOperator() == OO_Array_Delete)
4698 IsVirtualOkay = !isStatic;
4700 // This is a C++ method declaration.
4701 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC),
4702 D.getSourceRange().getBegin(), NameInfo, R,
4703 TInfo, isStatic, SCAsWritten, isInline,
4704 isConstexpr, SourceLocation());
4707 // Determine whether the function was written with a
4708 // prototype. This true when:
4709 // - we're in C++ (where every function has a prototype),
4710 return FunctionDecl::Create(SemaRef.Context, DC,
4711 D.getSourceRange().getBegin(),
4712 NameInfo, R, TInfo, SC, SCAsWritten, isInline,
4713 true/*HasPrototype*/, isConstexpr);
4718 Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC,
4719 TypeSourceInfo *TInfo, LookupResult &Previous,
4720 MultiTemplateParamsArg TemplateParamLists,
4722 QualType R = TInfo->getType();
4724 assert(R.getTypePtr()->isFunctionType());
4726 // TODO: consider using NameInfo for diagnostic.
4727 DeclarationNameInfo NameInfo = GetNameForDeclarator(D);
4728 DeclarationName Name = NameInfo.getName();
4729 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D);
4731 if (D.getDeclSpec().isThreadSpecified())
4732 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
4734 // Do not allow returning a objc interface by-value.
4735 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) {
4736 Diag(D.getIdentifierLoc(),
4737 diag::err_object_cannot_be_passed_returned_by_value) << 0
4738 << R->getAs<FunctionType>()->getResultType()
4739 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*");
4741 QualType T = R->getAs<FunctionType>()->getResultType();
4742 T = Context.getObjCObjectPointerType(T);
4743 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) {
4744 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo();
4745 R = Context.getFunctionType(T, FPT->arg_type_begin(),
4746 FPT->getNumArgs(), EPI);
4748 else if (isa<FunctionNoProtoType>(R))
4749 R = Context.getFunctionNoProtoType(T);
4752 bool isFriend = false;
4753 FunctionTemplateDecl *FunctionTemplate = 0;
4754 bool isExplicitSpecialization = false;
4755 bool isFunctionTemplateSpecialization = false;
4756 bool isDependentClassScopeExplicitSpecialization = false;
4757 bool isVirtualOkay = false;
4759 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC,
4761 if (!NewFD) return 0;
4763 if (getLangOptions().CPlusPlus) {
4764 bool isInline = D.getDeclSpec().isInlineSpecified();
4765 bool isVirtual = D.getDeclSpec().isVirtualSpecified();
4766 bool isExplicit = D.getDeclSpec().isExplicitSpecified();
4767 bool isConstexpr = D.getDeclSpec().isConstexprSpecified();
4768 isFriend = D.getDeclSpec().isFriendSpecified();
4769 if (isFriend && !isInline && D.isFunctionDefinition()) {
4770 // C++ [class.friend]p5
4771 // A function can be defined in a friend declaration of a
4772 // class . . . . Such a function is implicitly inline.
4773 NewFD->setImplicitlyInline();
4776 SetNestedNameSpecifier(NewFD, D);
4777 isExplicitSpecialization = false;
4778 isFunctionTemplateSpecialization = false;
4779 if (D.isInvalidType())
4780 NewFD->setInvalidDecl();
4782 // Set the lexical context. If the declarator has a C++
4783 // scope specifier, or is the object of a friend declaration, the
4784 // lexical context will be different from the semantic context.
4785 NewFD->setLexicalDeclContext(CurContext);
4787 // Match up the template parameter lists with the scope specifier, then
4788 // determine whether we have a template or a template specialization.
4789 bool Invalid = false;
4790 if (TemplateParameterList *TemplateParams
4791 = MatchTemplateParametersToScopeSpecifier(
4792 D.getDeclSpec().getSourceRange().getBegin(),
4793 D.getIdentifierLoc(),
4794 D.getCXXScopeSpec(),
4795 TemplateParamLists.get(),
4796 TemplateParamLists.size(),
4798 isExplicitSpecialization,
4800 if (TemplateParams->size() > 0) {
4801 // This is a function template
4803 // Check that we can declare a template here.
4804 if (CheckTemplateDeclScope(S, TemplateParams))
4807 // A destructor cannot be a template.
4808 if (Name.getNameKind() == DeclarationName::CXXDestructorName) {
4809 Diag(NewFD->getLocation(), diag::err_destructor_template);
4813 // If we're adding a template to a dependent context, we may need to
4814 // rebuilding some of the types used within the template parameter list,
4815 // now that we know what the current instantiation is.
4816 if (DC->isDependentContext()) {
4817 ContextRAII SavedContext(*this, DC);
4818 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams))
4823 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC,
4824 NewFD->getLocation(),
4825 Name, TemplateParams,
4827 FunctionTemplate->setLexicalDeclContext(CurContext);
4828 NewFD->setDescribedFunctionTemplate(FunctionTemplate);
4830 // For source fidelity, store the other template param lists.
4831 if (TemplateParamLists.size() > 1) {
4832 NewFD->setTemplateParameterListsInfo(Context,
4833 TemplateParamLists.size() - 1,
4834 TemplateParamLists.release());
4837 // This is a function template specialization.
4838 isFunctionTemplateSpecialization = true;
4839 // For source fidelity, store all the template param lists.
4840 NewFD->setTemplateParameterListsInfo(Context,
4841 TemplateParamLists.size(),
4842 TemplateParamLists.release());
4844 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);".
4846 // We want to remove the "template<>", found here.
4847 SourceRange RemoveRange = TemplateParams->getSourceRange();
4849 // If we remove the template<> and the name is not a
4850 // template-id, we're actually silently creating a problem:
4851 // the friend declaration will refer to an untemplated decl,
4852 // and clearly the user wants a template specialization. So
4853 // we need to insert '<>' after the name.
4854 SourceLocation InsertLoc;
4855 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) {
4856 InsertLoc = D.getName().getSourceRange().getEnd();
4857 InsertLoc = PP.getLocForEndOfToken(InsertLoc);
4860 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend)
4861 << Name << RemoveRange
4862 << FixItHint::CreateRemoval(RemoveRange)
4863 << FixItHint::CreateInsertion(InsertLoc, "<>");
4868 // All template param lists were matched against the scope specifier:
4869 // this is NOT (an explicit specialization of) a template.
4870 if (TemplateParamLists.size() > 0)
4871 // For source fidelity, store all the template param lists.
4872 NewFD->setTemplateParameterListsInfo(Context,
4873 TemplateParamLists.size(),
4874 TemplateParamLists.release());
4878 NewFD->setInvalidDecl();
4879 if (FunctionTemplate)
4880 FunctionTemplate->setInvalidDecl();
4883 // C++ [dcl.fct.spec]p5:
4884 // The virtual specifier shall only be used in declarations of
4885 // nonstatic class member functions that appear within a
4886 // member-specification of a class declaration; see 10.3.
4888 if (isVirtual && !NewFD->isInvalidDecl()) {
4889 if (!isVirtualOkay) {
4890 Diag(D.getDeclSpec().getVirtualSpecLoc(),
4891 diag::err_virtual_non_function);
4892 } else if (!CurContext->isRecord()) {
4893 // 'virtual' was specified outside of the class.
4894 Diag(D.getDeclSpec().getVirtualSpecLoc(),
4895 diag::err_virtual_out_of_class)
4896 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc());
4897 } else if (NewFD->getDescribedFunctionTemplate()) {
4898 // C++ [temp.mem]p3:
4899 // A member function template shall not be virtual.
4900 Diag(D.getDeclSpec().getVirtualSpecLoc(),
4901 diag::err_virtual_member_function_template)
4902 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc());
4904 // Okay: Add virtual to the method.
4905 NewFD->setVirtualAsWritten(true);
4909 // C++ [dcl.fct.spec]p3:
4910 // The inline specifier shall not appear on a block scope function declaration.
4911 if (isInline && !NewFD->isInvalidDecl()) {
4912 if (CurContext->isFunctionOrMethod()) {
4913 // 'inline' is not allowed on block scope function declaration.
4914 Diag(D.getDeclSpec().getInlineSpecLoc(),
4915 diag::err_inline_declaration_block_scope) << Name
4916 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc());
4920 // C++ [dcl.fct.spec]p6:
4921 // The explicit specifier shall be used only in the declaration of a
4922 // constructor or conversion function within its class definition; see 12.3.1
4924 if (isExplicit && !NewFD->isInvalidDecl()) {
4925 if (!CurContext->isRecord()) {
4926 // 'explicit' was specified outside of the class.
4927 Diag(D.getDeclSpec().getExplicitSpecLoc(),
4928 diag::err_explicit_out_of_class)
4929 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
4930 } else if (!isa<CXXConstructorDecl>(NewFD) &&
4931 !isa<CXXConversionDecl>(NewFD)) {
4932 // 'explicit' was specified on a function that wasn't a constructor
4933 // or conversion function.
4934 Diag(D.getDeclSpec().getExplicitSpecLoc(),
4935 diag::err_explicit_non_ctor_or_conv_function)
4936 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc());
4941 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors
4942 // are implicitly inline.
4943 NewFD->setImplicitlyInline();
4945 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to
4946 // be either constructors or to return a literal type. Therefore,
4947 // destructors cannot be declared constexpr.
4948 if (isa<CXXDestructorDecl>(NewFD))
4949 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor);
4952 // If __module_private__ was specified, mark the function accordingly.
4953 if (D.getDeclSpec().isModulePrivateSpecified()) {
4954 if (isFunctionTemplateSpecialization) {
4955 SourceLocation ModulePrivateLoc
4956 = D.getDeclSpec().getModulePrivateSpecLoc();
4957 Diag(ModulePrivateLoc, diag::err_module_private_specialization)
4959 << FixItHint::CreateRemoval(ModulePrivateLoc);
4961 NewFD->setModulePrivate();
4962 if (FunctionTemplate)
4963 FunctionTemplate->setModulePrivate();
4968 // For now, claim that the objects have no previous declaration.
4969 if (FunctionTemplate) {
4970 FunctionTemplate->setObjectOfFriendDecl(false);
4971 FunctionTemplate->setAccess(AS_public);
4973 NewFD->setObjectOfFriendDecl(false);
4974 NewFD->setAccess(AS_public);
4977 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext &&
4978 D.isFunctionDefinition()) {
4979 // A method is implicitly inline if it's defined in its class
4981 NewFD->setImplicitlyInline();
4984 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) &&
4985 !CurContext->isRecord()) {
4986 // C++ [class.static]p1:
4987 // A data or function member of a class may be declared static
4988 // in a class definition, in which case it is a static member of
4991 // Complain about the 'static' specifier if it's on an out-of-line
4992 // member function definition.
4993 Diag(D.getDeclSpec().getStorageClassSpecLoc(),
4994 diag::err_static_out_of_line)
4995 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc());
4999 // Filter out previous declarations that don't match the scope.
5000 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(),
5001 isExplicitSpecialization ||
5002 isFunctionTemplateSpecialization);
5004 // Handle GNU asm-label extension (encoded as an attribute).
5005 if (Expr *E = (Expr*) D.getAsmLabel()) {
5006 // The parser guarantees this is a string.
5007 StringLiteral *SE = cast<StringLiteral>(E);
5008 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context,
5012 // Copy the parameter declarations from the declarator D to the function
5013 // declaration NewFD, if they are available. First scavenge them into Params.
5014 SmallVector<ParmVarDecl*, 16> Params;
5015 if (D.isFunctionDeclarator()) {
5016 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
5018 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs
5019 // function that takes no arguments, not a function that takes a
5020 // single void argument.
5021 // We let through "const void" here because Sema::GetTypeForDeclarator
5022 // already checks for that case.
5023 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
5024 FTI.ArgInfo[0].Param &&
5025 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) {
5026 // Empty arg list, don't push any params.
5027 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param);
5029 // In C++, the empty parameter-type-list must be spelled "void"; a
5030 // typedef of void is not permitted.
5031 if (getLangOptions().CPlusPlus &&
5032 Param->getType().getUnqualifiedType() != Context.VoidTy) {
5033 bool IsTypeAlias = false;
5034 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>())
5035 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl());
5036 else if (const TemplateSpecializationType *TST =
5037 Param->getType()->getAs<TemplateSpecializationType>())
5038 IsTypeAlias = TST->isTypeAlias();
5039 Diag(Param->getLocation(), diag::err_param_typedef_of_void)
5042 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) {
5043 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) {
5044 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param);
5045 assert(Param->getDeclContext() != NewFD && "Was set before ?");
5046 Param->setDeclContext(NewFD);
5047 Params.push_back(Param);
5049 if (Param->isInvalidDecl())
5050 NewFD->setInvalidDecl();
5054 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) {
5055 // When we're declaring a function with a typedef, typeof, etc as in the
5056 // following example, we'll need to synthesize (unnamed)
5057 // parameters for use in the declaration.
5060 // typedef void fn(int);
5064 // Synthesize a parameter for each argument type.
5065 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(),
5066 AE = FT->arg_type_end(); AI != AE; ++AI) {
5067 ParmVarDecl *Param =
5068 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI);
5069 Param->setScopeInfo(0, Params.size());
5070 Params.push_back(Param);
5073 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 &&
5074 "Should not need args for typedef of non-prototype fn");
5077 // Finally, we know we have the right number of parameters, install them.
5078 NewFD->setParams(Params);
5080 // Process the non-inheritable attributes on this declaration.
5081 ProcessDeclAttributes(S, NewFD, D,
5082 /*NonInheritable=*/true, /*Inheritable=*/false);
5084 if (!getLangOptions().CPlusPlus) {
5085 // Perform semantic checking on the function declaration.
5086 bool isExplicitSpecialization=false;
5087 if (!NewFD->isInvalidDecl()) {
5088 if (NewFD->getResultType()->isVariablyModifiedType()) {
5089 // Functions returning a variably modified type violate C99 6.7.5.2p2
5090 // because all functions have linkage.
5091 Diag(NewFD->getLocation(), diag::err_vm_func_decl);
5092 NewFD->setInvalidDecl();
5094 if (NewFD->isMain())
5095 CheckMain(NewFD, D.getDeclSpec());
5096 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous,
5097 isExplicitSpecialization));
5100 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() ||
5101 Previous.getResultKind() != LookupResult::FoundOverloaded) &&
5102 "previous declaration set still overloaded");
5104 // If the declarator is a template-id, translate the parser's template
5105 // argument list into our AST format.
5106 bool HasExplicitTemplateArgs = false;
5107 TemplateArgumentListInfo TemplateArgs;
5108 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) {
5109 TemplateIdAnnotation *TemplateId = D.getName().TemplateId;
5110 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc);
5111 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc);
5112 ASTTemplateArgsPtr TemplateArgsPtr(*this,
5113 TemplateId->getTemplateArgs(),
5114 TemplateId->NumArgs);
5115 translateTemplateArguments(TemplateArgsPtr,
5117 TemplateArgsPtr.release();
5119 HasExplicitTemplateArgs = true;
5121 if (NewFD->isInvalidDecl()) {
5122 HasExplicitTemplateArgs = false;
5123 } else if (FunctionTemplate) {
5124 // Function template with explicit template arguments.
5125 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec)
5126 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc);
5128 HasExplicitTemplateArgs = false;
5129 } else if (!isFunctionTemplateSpecialization &&
5130 !D.getDeclSpec().isFriendSpecified()) {
5131 // We have encountered something that the user meant to be a
5132 // specialization (because it has explicitly-specified template
5133 // arguments) but that was not introduced with a "template<>" (or had
5134 // too few of them).
5135 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header)
5136 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc)
5137 << FixItHint::CreateInsertion(
5138 D.getDeclSpec().getSourceRange().getBegin(),
5140 isFunctionTemplateSpecialization = true;
5142 // "friend void foo<>(int);" is an implicit specialization decl.
5143 isFunctionTemplateSpecialization = true;
5145 } else if (isFriend && isFunctionTemplateSpecialization) {
5146 // This combination is only possible in a recovery case; the user
5147 // wrote something like:
5148 // template <> friend void foo(int);
5149 // which we're recovering from as if the user had written:
5150 // friend void foo<>(int);
5151 // Go ahead and fake up a template id.
5152 HasExplicitTemplateArgs = true;
5153 TemplateArgs.setLAngleLoc(D.getIdentifierLoc());
5154 TemplateArgs.setRAngleLoc(D.getIdentifierLoc());
5157 // If it's a friend (and only if it's a friend), it's possible
5158 // that either the specialized function type or the specialized
5159 // template is dependent, and therefore matching will fail. In
5160 // this case, don't check the specialization yet.
5161 bool InstantiationDependent = false;
5162 if (isFunctionTemplateSpecialization && isFriend &&
5163 (NewFD->getType()->isDependentType() || DC->isDependentContext() ||
5164 TemplateSpecializationType::anyDependentTemplateArguments(
5165 TemplateArgs.getArgumentArray(), TemplateArgs.size(),
5166 InstantiationDependent))) {
5167 assert(HasExplicitTemplateArgs &&
5168 "friend function specialization without template args");
5169 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs,
5171 NewFD->setInvalidDecl();
5172 } else if (isFunctionTemplateSpecialization) {
5173 if (CurContext->isDependentContext() && CurContext->isRecord()
5175 isDependentClassScopeExplicitSpecialization = true;
5176 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ?
5177 diag::ext_function_specialization_in_class :
5178 diag::err_function_specialization_in_class)
5179 << NewFD->getDeclName();
5180 } else if (CheckFunctionTemplateSpecialization(NewFD,
5181 (HasExplicitTemplateArgs ? &TemplateArgs : 0),
5183 NewFD->setInvalidDecl();
5186 // A storage-class-specifier shall not be specified in an explicit
5187 // specialization (14.7.3)
5188 if (SC != SC_None) {
5189 if (SC != NewFD->getStorageClass())
5190 Diag(NewFD->getLocation(),
5191 diag::err_explicit_specialization_inconsistent_storage_class)
5193 << FixItHint::CreateRemoval(
5194 D.getDeclSpec().getStorageClassSpecLoc());
5197 Diag(NewFD->getLocation(),
5198 diag::ext_explicit_specialization_storage_class)
5199 << FixItHint::CreateRemoval(
5200 D.getDeclSpec().getStorageClassSpecLoc());
5203 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) {
5204 if (CheckMemberSpecialization(NewFD, Previous))
5205 NewFD->setInvalidDecl();
5208 // Perform semantic checking on the function declaration.
5209 if (!isDependentClassScopeExplicitSpecialization) {
5210 if (NewFD->isInvalidDecl()) {
5211 // If this is a class member, mark the class invalid immediately.
5212 // This avoids some consistency errors later.
5213 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD))
5214 methodDecl->getParent()->setInvalidDecl();
5216 if (NewFD->isMain())
5217 CheckMain(NewFD, D.getDeclSpec());
5218 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous,
5219 isExplicitSpecialization));
5223 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() ||
5224 Previous.getResultKind() != LookupResult::FoundOverloaded) &&
5225 "previous declaration set still overloaded");
5227 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() &&
5228 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration))
5229 NewFD->setInvalidDecl();
5231 NamedDecl *PrincipalDecl = (FunctionTemplate
5232 ? cast<NamedDecl>(FunctionTemplate)
5235 if (isFriend && D.isRedeclaration()) {
5236 AccessSpecifier Access = AS_public;
5237 if (!NewFD->isInvalidDecl())
5238 Access = NewFD->getPreviousDeclaration()->getAccess();
5240 NewFD->setAccess(Access);
5241 if (FunctionTemplate) FunctionTemplate->setAccess(Access);
5243 PrincipalDecl->setObjectOfFriendDecl(true);
5246 if (NewFD->isOverloadedOperator() && !DC->isRecord() &&
5247 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary))
5248 PrincipalDecl->setNonMemberOperator();
5250 // If we have a function template, check the template parameter
5251 // list. This will check and merge default template arguments.
5252 if (FunctionTemplate) {
5253 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration();
5254 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(),
5255 PrevTemplate? PrevTemplate->getTemplateParameters() : 0,
5256 D.getDeclSpec().isFriendSpecified()
5257 ? (D.isFunctionDefinition()
5258 ? TPC_FriendFunctionTemplateDefinition
5259 : TPC_FriendFunctionTemplate)
5260 : (D.getCXXScopeSpec().isSet() &&
5261 DC && DC->isRecord() &&
5262 DC->isDependentContext())
5263 ? TPC_ClassTemplateMember
5264 : TPC_FunctionTemplate);
5267 if (NewFD->isInvalidDecl()) {
5268 // Ignore all the rest of this.
5269 } else if (!D.isRedeclaration()) {
5270 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists,
5272 // Fake up an access specifier if it's supposed to be a class member.
5273 if (isa<CXXRecordDecl>(NewFD->getDeclContext()))
5274 NewFD->setAccess(AS_public);
5276 // Qualified decls generally require a previous declaration.
5277 if (D.getCXXScopeSpec().isSet()) {
5278 // ...with the major exception of templated-scope or
5279 // dependent-scope friend declarations.
5281 // TODO: we currently also suppress this check in dependent
5282 // contexts because (1) the parameter depth will be off when
5283 // matching friend templates and (2) we might actually be
5284 // selecting a friend based on a dependent factor. But there
5285 // are situations where these conditions don't apply and we
5286 // can actually do this check immediately.
5288 (TemplateParamLists.size() ||
5289 D.getCXXScopeSpec().getScopeRep()->isDependent() ||
5290 CurContext->isDependentContext())) {
5293 // The user tried to provide an out-of-line definition for a
5294 // function that is a member of a class or namespace, but there
5295 // was no such member function declared (C++ [class.mfct]p2,
5296 // C++ [namespace.memdef]p2). For example:
5302 // void X::f() { } // ill-formed
5304 // Complain about this problem, and attempt to suggest close
5305 // matches (e.g., those that differ only in cv-qualifiers and
5306 // whether the parameter types are references).
5308 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous,
5311 AddToScope = ExtraArgs.AddToScope;
5316 // Unqualified local friend declarations are required to resolve
5318 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) {
5319 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous,
5322 AddToScope = ExtraArgs.AddToScope;
5327 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() &&
5328 !isFriend && !isFunctionTemplateSpecialization &&
5329 !isExplicitSpecialization) {
5330 // An out-of-line member function declaration must also be a
5331 // definition (C++ [dcl.meaning]p1).
5332 // Note that this is not the case for explicit specializations of
5333 // function templates or member functions of class templates, per
5334 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension
5335 // for compatibility with old SWIG code which likes to generate them.
5336 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration)
5337 << D.getCXXScopeSpec().getRange();
5342 // Handle attributes. We need to have merged decls when handling attributes
5343 // (for example to check for conflicts, etc).
5344 // FIXME: This needs to happen before we merge declarations. Then,
5345 // let attribute merging cope with attribute conflicts.
5346 ProcessDeclAttributes(S, NewFD, D,
5347 /*NonInheritable=*/false, /*Inheritable=*/true);
5349 // attributes declared post-definition are currently ignored
5350 // FIXME: This should happen during attribute merging
5351 if (D.isRedeclaration() && Previous.isSingleResult()) {
5352 const FunctionDecl *Def;
5353 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl());
5354 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) {
5355 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition);
5356 Diag(Def->getLocation(), diag::note_previous_definition);
5360 AddKnownFunctionAttributes(NewFD);
5362 if (NewFD->hasAttr<OverloadableAttr>() &&
5363 !NewFD->getType()->getAs<FunctionProtoType>()) {
5364 Diag(NewFD->getLocation(),
5365 diag::err_attribute_overloadable_no_prototype)
5368 // Turn this into a variadic function with no parameters.
5369 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>();
5370 FunctionProtoType::ExtProtoInfo EPI;
5371 EPI.Variadic = true;
5372 EPI.ExtInfo = FT->getExtInfo();
5374 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI);
5378 // If there's a #pragma GCC visibility in scope, and this isn't a class
5379 // member, set the visibility of this function.
5380 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord())
5381 AddPushedVisibilityAttribute(NewFD);
5383 // If there's a #pragma clang arc_cf_code_audited in scope, consider
5384 // marking the function.
5385 AddCFAuditedAttribute(NewFD);
5387 // If this is a locally-scoped extern C function, update the
5388 // map of such names.
5389 if (CurContext->isFunctionOrMethod() && NewFD->isExternC()
5390 && !NewFD->isInvalidDecl())
5391 RegisterLocallyScopedExternCDecl(NewFD, Previous, S);
5393 // Set this FunctionDecl's range up to the right paren.
5394 NewFD->setRangeEnd(D.getSourceRange().getEnd());
5396 if (getLangOptions().CPlusPlus) {
5397 if (FunctionTemplate) {
5398 if (NewFD->isInvalidDecl())
5399 FunctionTemplate->setInvalidDecl();
5400 return FunctionTemplate;
5404 MarkUnusedFileScopedDecl(NewFD);
5406 if (getLangOptions().CUDA)
5407 if (IdentifierInfo *II = NewFD->getIdentifier())
5408 if (!NewFD->isInvalidDecl() &&
5409 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) {
5410 if (II->isStr("cudaConfigureCall")) {
5411 if (!R->getAs<FunctionType>()->getResultType()->isScalarType())
5412 Diag(NewFD->getLocation(), diag::err_config_scalar_return);
5414 Context.setcudaConfigureCallDecl(NewFD);
5418 // Here we have an function template explicit specialization at class scope.
5419 // The actually specialization will be postponed to template instatiation
5420 // time via the ClassScopeFunctionSpecializationDecl node.
5421 if (isDependentClassScopeExplicitSpecialization) {
5422 ClassScopeFunctionSpecializationDecl *NewSpec =
5423 ClassScopeFunctionSpecializationDecl::Create(
5424 Context, CurContext, SourceLocation(),
5425 cast<CXXMethodDecl>(NewFD));
5426 CurContext->addDecl(NewSpec);
5433 /// \brief Perform semantic checking of a new function declaration.
5435 /// Performs semantic analysis of the new function declaration
5436 /// NewFD. This routine performs all semantic checking that does not
5437 /// require the actual declarator involved in the declaration, and is
5438 /// used both for the declaration of functions as they are parsed
5439 /// (called via ActOnDeclarator) and for the declaration of functions
5440 /// that have been instantiated via C++ template instantiation (called
5441 /// via InstantiateDecl).
5443 /// \param IsExplicitSpecialiation whether this new function declaration is
5444 /// an explicit specialization of the previous declaration.
5446 /// This sets NewFD->isInvalidDecl() to true if there was an error.
5448 /// Returns true if the function declaration is a redeclaration.
5449 bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD,
5450 LookupResult &Previous,
5451 bool IsExplicitSpecialization) {
5452 assert(!NewFD->getResultType()->isVariablyModifiedType()
5453 && "Variably modified return types are not handled here");
5455 // Check for a previous declaration of this name.
5456 if (Previous.empty() && NewFD->isExternC()) {
5457 // Since we did not find anything by this name and we're declaring
5458 // an extern "C" function, look for a non-visible extern "C"
5459 // declaration with the same name.
5460 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
5461 = findLocallyScopedExternalDecl(NewFD->getDeclName());
5462 if (Pos != LocallyScopedExternalDecls.end())
5463 Previous.addDecl(Pos->second);
5466 bool Redeclaration = false;
5468 // Merge or overload the declaration with an existing declaration of
5469 // the same name, if appropriate.
5470 if (!Previous.empty()) {
5471 // Determine whether NewFD is an overload of PrevDecl or
5472 // a declaration that requires merging. If it's an overload,
5473 // there's no more work to do here; we'll just add the new
5474 // function to the scope.
5476 NamedDecl *OldDecl = 0;
5477 if (!AllowOverloadingOfFunction(Previous, Context)) {
5478 Redeclaration = true;
5479 OldDecl = Previous.getFoundDecl();
5481 switch (CheckOverload(S, NewFD, Previous, OldDecl,
5482 /*NewIsUsingDecl*/ false)) {
5484 Redeclaration = true;
5487 case Ovl_NonFunction:
5488 Redeclaration = true;
5492 Redeclaration = false;
5496 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) {
5497 // If a function name is overloadable in C, then every function
5498 // with that name must be marked "overloadable".
5499 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing)
5500 << Redeclaration << NewFD;
5501 NamedDecl *OverloadedDecl = 0;
5503 OverloadedDecl = OldDecl;
5504 else if (!Previous.empty())
5505 OverloadedDecl = Previous.getRepresentativeDecl();
5507 Diag(OverloadedDecl->getLocation(),
5508 diag::note_attribute_overloadable_prev_overload);
5509 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(),
5514 if (Redeclaration) {
5515 // NewFD and OldDecl represent declarations that need to be
5517 if (MergeFunctionDecl(NewFD, OldDecl)) {
5518 NewFD->setInvalidDecl();
5519 return Redeclaration;
5523 Previous.addDecl(OldDecl);
5525 if (FunctionTemplateDecl *OldTemplateDecl
5526 = dyn_cast<FunctionTemplateDecl>(OldDecl)) {
5527 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl());
5528 FunctionTemplateDecl *NewTemplateDecl
5529 = NewFD->getDescribedFunctionTemplate();
5530 assert(NewTemplateDecl && "Template/non-template mismatch");
5531 if (CXXMethodDecl *Method
5532 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) {
5533 Method->setAccess(OldTemplateDecl->getAccess());
5534 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess());
5537 // If this is an explicit specialization of a member that is a function
5538 // template, mark it as a member specialization.
5539 if (IsExplicitSpecialization &&
5540 NewTemplateDecl->getInstantiatedFromMemberTemplate()) {
5541 NewTemplateDecl->setMemberSpecialization();
5542 assert(OldTemplateDecl->isMemberSpecialization());
5545 if (OldTemplateDecl->isModulePrivate())
5546 NewTemplateDecl->setModulePrivate();
5549 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions
5550 NewFD->setAccess(OldDecl->getAccess());
5551 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl));
5556 // Semantic checking for this function declaration (in isolation).
5557 if (getLangOptions().CPlusPlus) {
5558 // C++-specific checks.
5559 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) {
5560 CheckConstructor(Constructor);
5561 } else if (CXXDestructorDecl *Destructor =
5562 dyn_cast<CXXDestructorDecl>(NewFD)) {
5563 CXXRecordDecl *Record = Destructor->getParent();
5564 QualType ClassType = Context.getTypeDeclType(Record);
5566 // FIXME: Shouldn't we be able to perform this check even when the class
5567 // type is dependent? Both gcc and edg can handle that.
5568 if (!ClassType->isDependentType()) {
5569 DeclarationName Name
5570 = Context.DeclarationNames.getCXXDestructorName(
5571 Context.getCanonicalType(ClassType));
5572 if (NewFD->getDeclName() != Name) {
5573 Diag(NewFD->getLocation(), diag::err_destructor_name);
5574 NewFD->setInvalidDecl();
5575 return Redeclaration;
5578 } else if (CXXConversionDecl *Conversion
5579 = dyn_cast<CXXConversionDecl>(NewFD)) {
5580 ActOnConversionDeclarator(Conversion);
5583 // Find any virtual functions that this function overrides.
5584 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) {
5585 if (!Method->isFunctionTemplateSpecialization() &&
5586 !Method->getDescribedFunctionTemplate()) {
5587 if (AddOverriddenMethods(Method->getParent(), Method)) {
5588 // If the function was marked as "static", we have a problem.
5589 if (NewFD->getStorageClass() == SC_Static) {
5590 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual)
5591 << NewFD->getDeclName();
5592 for (CXXMethodDecl::method_iterator
5593 Overridden = Method->begin_overridden_methods(),
5594 OverriddenEnd = Method->end_overridden_methods();
5595 Overridden != OverriddenEnd;
5597 Diag((*Overridden)->getLocation(),
5598 diag::note_overridden_virtual_function);
5605 // Extra checking for C++ overloaded operators (C++ [over.oper]).
5606 if (NewFD->isOverloadedOperator() &&
5607 CheckOverloadedOperatorDeclaration(NewFD)) {
5608 NewFD->setInvalidDecl();
5609 return Redeclaration;
5612 // Extra checking for C++0x literal operators (C++0x [over.literal]).
5613 if (NewFD->getLiteralIdentifier() &&
5614 CheckLiteralOperatorDeclaration(NewFD)) {
5615 NewFD->setInvalidDecl();
5616 return Redeclaration;
5619 // In C++, check default arguments now that we have merged decls. Unless
5620 // the lexical context is the class, because in this case this is done
5621 // during delayed parsing anyway.
5622 if (!CurContext->isRecord())
5623 CheckCXXDefaultArguments(NewFD);
5625 // If this function declares a builtin function, check the type of this
5626 // declaration against the expected type for the builtin.
5627 if (unsigned BuiltinID = NewFD->getBuiltinID()) {
5628 ASTContext::GetBuiltinTypeError Error;
5629 QualType T = Context.GetBuiltinType(BuiltinID, Error);
5630 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) {
5631 // The type of this function differs from the type of the builtin,
5632 // so forget about the builtin entirely.
5633 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents);
5637 return Redeclaration;
5640 void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) {
5641 // C++ [basic.start.main]p3: A program that declares main to be inline
5642 // or static is ill-formed.
5643 // C99 6.7.4p4: In a hosted environment, the inline function specifier
5644 // shall not appear in a declaration of main.
5645 // static main is not an error under C99, but we should warn about it.
5646 if (FD->getStorageClass() == SC_Static)
5647 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus
5648 ? diag::err_static_main : diag::warn_static_main)
5649 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
5650 if (FD->isInlineSpecified())
5651 Diag(DS.getInlineSpecLoc(), diag::err_inline_main)
5652 << FixItHint::CreateRemoval(DS.getInlineSpecLoc());
5654 QualType T = FD->getType();
5655 assert(T->isFunctionType() && "function decl is not of function type");
5656 const FunctionType* FT = T->getAs<FunctionType>();
5658 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) {
5659 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint);
5660 FD->setInvalidDecl(true);
5663 // Treat protoless main() as nullary.
5664 if (isa<FunctionNoProtoType>(FT)) return;
5666 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT);
5667 unsigned nparams = FTP->getNumArgs();
5668 assert(FD->getNumParams() == nparams);
5670 bool HasExtraParameters = (nparams > 3);
5672 // Darwin passes an undocumented fourth argument of type char**. If
5673 // other platforms start sprouting these, the logic below will start
5675 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin())
5676 HasExtraParameters = false;
5678 if (HasExtraParameters) {
5679 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams;
5680 FD->setInvalidDecl(true);
5684 // FIXME: a lot of the following diagnostics would be improved
5685 // if we had some location information about types.
5688 Context.getPointerType(Context.getPointerType(Context.CharTy));
5689 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP };
5691 for (unsigned i = 0; i < nparams; ++i) {
5692 QualType AT = FTP->getArgType(i);
5694 bool mismatch = true;
5696 if (Context.hasSameUnqualifiedType(AT, Expected[i]))
5698 else if (Expected[i] == CharPP) {
5699 // As an extension, the following forms are okay:
5701 // char const * const *
5704 QualifierCollector qs;
5705 const PointerType* PT;
5706 if ((PT = qs.strip(AT)->getAs<PointerType>()) &&
5707 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) &&
5708 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) {
5710 mismatch = !qs.empty();
5715 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i];
5716 // TODO: suggest replacing given type with expected type
5717 FD->setInvalidDecl(true);
5721 if (nparams == 1 && !FD->isInvalidDecl()) {
5722 Diag(FD->getLocation(), diag::warn_main_one_arg);
5725 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) {
5726 Diag(FD->getLocation(), diag::err_main_template_decl);
5727 FD->setInvalidDecl();
5731 bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) {
5732 // FIXME: Need strict checking. In C89, we need to check for
5733 // any assignment, increment, decrement, function-calls, or
5734 // commas outside of a sizeof. In C99, it's the same list,
5735 // except that the aforementioned are allowed in unevaluated
5736 // expressions. Everything else falls under the
5737 // "may accept other forms of constant expressions" exception.
5738 // (We never end up here for C++, so the constant expression
5739 // rules there don't matter.)
5740 if (Init->isConstantInitializer(Context, false))
5742 Diag(Init->getExprLoc(), diag::err_init_element_not_constant)
5743 << Init->getSourceRange();
5748 // Visits an initialization expression to see if OrigDecl is evaluated in
5749 // its own initialization and throws a warning if it does.
5750 class SelfReferenceChecker
5751 : public EvaluatedExprVisitor<SelfReferenceChecker> {
5758 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited;
5760 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context),
5761 S(S), OrigDecl(OrigDecl) {
5763 isRecordType = false;
5764 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) {
5765 isPODType = VD->getType().isPODType(S.Context);
5766 isRecordType = VD->getType()->isRecordType();
5770 void VisitExpr(Expr *E) {
5771 if (isa<ObjCMessageExpr>(*E)) return;
5774 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) {
5775 ValueDecl *VD = ME->getMemberDecl();
5776 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return;
5777 expr = ME->getBase();
5779 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) {
5780 HandleDeclRefExpr(DRE);
5784 Inherited::VisitExpr(E);
5787 void VisitMemberExpr(MemberExpr *E) {
5788 if (E->getType()->canDecayToPointerType()) return;
5789 if (isa<FieldDecl>(E->getMemberDecl()))
5790 if (DeclRefExpr *DRE
5791 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) {
5792 HandleDeclRefExpr(DRE);
5795 Inherited::VisitMemberExpr(E);
5798 void VisitImplicitCastExpr(ImplicitCastExpr *E) {
5799 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) ||
5800 (isRecordType && E->getCastKind() == CK_NoOp)) {
5801 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts();
5802 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr))
5803 SubExpr = ME->getBase()->IgnoreParenImpCasts();
5804 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) {
5805 HandleDeclRefExpr(DRE);
5809 Inherited::VisitImplicitCastExpr(E);
5812 void VisitUnaryOperator(UnaryOperator *E) {
5813 // For POD record types, addresses of its own members are well-defined.
5814 if (isRecordType && isPODType) return;
5815 Inherited::VisitUnaryOperator(E);
5818 void HandleDeclRefExpr(DeclRefExpr *DRE) {
5819 Decl* ReferenceDecl = DRE->getDecl();
5820 if (OrigDecl != ReferenceDecl) return;
5821 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName,
5822 Sema::NotForRedeclaration);
5823 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE,
5824 S.PDiag(diag::warn_uninit_self_reference_in_init)
5825 << Result.getLookupName()
5826 << OrigDecl->getLocation()
5827 << DRE->getSourceRange());
5832 /// CheckSelfReference - Warns if OrigDecl is used in expression E.
5833 void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) {
5834 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E);
5837 /// AddInitializerToDecl - Adds the initializer Init to the
5838 /// declaration dcl. If DirectInit is true, this is C++ direct
5839 /// initialization rather than copy initialization.
5840 void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init,
5841 bool DirectInit, bool TypeMayContainAuto) {
5842 // If there is no declaration, there was an error parsing it. Just ignore
5844 if (RealDecl == 0 || RealDecl->isInvalidDecl())
5847 // Check for self-references within variable initializers.
5848 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) {
5849 // Variables declared within a function/method body are handled
5850 // by a dataflow analysis.
5851 if (!vd->hasLocalStorage() && !vd->isStaticLocal())
5852 CheckSelfReference(RealDecl, Init);
5855 CheckSelfReference(RealDecl, Init);
5858 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) {
5859 // With declarators parsed the way they are, the parser cannot
5860 // distinguish between a normal initializer and a pure-specifier.
5861 // Thus this grotesque test.
5863 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 &&
5864 Context.getCanonicalType(IL->getType()) == Context.IntTy)
5865 CheckPureMethod(Method, Init->getSourceRange());
5867 Diag(Method->getLocation(), diag::err_member_function_initialization)
5868 << Method->getDeclName() << Init->getSourceRange();
5869 Method->setInvalidDecl();
5874 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl);
5876 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here");
5877 Diag(RealDecl->getLocation(), diag::err_illegal_initializer);
5878 RealDecl->setInvalidDecl();
5882 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for.
5883 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) {
5884 TypeSourceInfo *DeducedType = 0;
5885 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType))
5886 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure)
5887 << VDecl->getDeclName() << VDecl->getType() << Init->getType()
5888 << Init->getSourceRange();
5890 RealDecl->setInvalidDecl();
5893 VDecl->setTypeSourceInfo(DeducedType);
5894 VDecl->setType(DeducedType->getType());
5896 // In ARC, infer lifetime.
5897 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl))
5898 VDecl->setInvalidDecl();
5900 // If this is a redeclaration, check that the type we just deduced matches
5901 // the previously declared type.
5902 if (VarDecl *Old = VDecl->getPreviousDeclaration())
5903 MergeVarDeclTypes(VDecl, Old);
5907 // A definition must end up with a complete type, which means it must be
5908 // complete with the restriction that an array type might be completed by the
5909 // initializer; note that later code assumes this restriction.
5910 QualType BaseDeclType = VDecl->getType();
5911 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType))
5912 BaseDeclType = Array->getElementType();
5913 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType,
5914 diag::err_typecheck_decl_incomplete_type)) {
5915 RealDecl->setInvalidDecl();
5919 // The variable can not have an abstract class type.
5920 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(),
5921 diag::err_abstract_type_in_decl,
5922 AbstractVariableType))
5923 VDecl->setInvalidDecl();
5926 if ((Def = VDecl->getDefinition()) && Def != VDecl) {
5927 Diag(VDecl->getLocation(), diag::err_redefinition)
5928 << VDecl->getDeclName();
5929 Diag(Def->getLocation(), diag::note_previous_definition);
5930 VDecl->setInvalidDecl();
5934 const VarDecl* PrevInit = 0;
5935 if (getLangOptions().CPlusPlus) {
5936 // C++ [class.static.data]p4
5937 // If a static data member is of const integral or const
5938 // enumeration type, its declaration in the class definition can
5939 // specify a constant-initializer which shall be an integral
5940 // constant expression (5.19). In that case, the member can appear
5941 // in integral constant expressions. The member shall still be
5942 // defined in a namespace scope if it is used in the program and the
5943 // namespace scope definition shall not contain an initializer.
5945 // We already performed a redefinition check above, but for static
5946 // data members we also need to check whether there was an in-class
5947 // declaration with an initializer.
5948 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) {
5949 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName();
5950 Diag(PrevInit->getLocation(), diag::note_previous_definition);
5954 if (VDecl->hasLocalStorage())
5955 getCurFunction()->setHasBranchProtectedScope();
5957 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) {
5958 VDecl->setInvalidDecl();
5963 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside
5964 // a kernel function cannot be initialized."
5965 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) {
5966 Diag(VDecl->getLocation(), diag::err_local_cant_init);
5967 VDecl->setInvalidDecl();
5971 // Capture the variable that is being initialized and the style of
5973 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl);
5975 // FIXME: Poor source location information.
5976 InitializationKind Kind
5977 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(),
5978 Init->getLocStart(),
5980 : InitializationKind::CreateCopy(VDecl->getLocation(),
5981 Init->getLocStart());
5983 // Get the decls type and save a reference for later, since
5984 // CheckInitializerTypes may change it.
5985 QualType DclT = VDecl->getType(), SavT = DclT;
5986 if (VDecl->isLocalVarDecl()) {
5987 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5
5988 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init);
5989 VDecl->setInvalidDecl();
5990 } else if (!VDecl->isInvalidDecl()) {
5991 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1);
5992 ExprResult Result = InitSeq.Perform(*this, Entity, Kind,
5993 MultiExprArg(*this, &Init, 1),
5995 if (Result.isInvalid()) {
5996 VDecl->setInvalidDecl();
6000 Init = Result.takeAs<Expr>();
6002 // C++ 3.6.2p2, allow dynamic initialization of static initializers.
6003 // Don't check invalid declarations to avoid emitting useless diagnostics.
6004 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) {
6005 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4.
6006 CheckForConstantInitializer(Init, DclT);
6009 } else if (VDecl->isStaticDataMember() &&
6010 VDecl->getLexicalDeclContext()->isRecord()) {
6011 // This is an in-class initialization for a static data member, e.g.,
6014 // static const int value = 17;
6017 // Try to perform the initialization regardless.
6018 if (!VDecl->isInvalidDecl()) {
6019 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1);
6020 ExprResult Result = InitSeq.Perform(*this, Entity, Kind,
6021 MultiExprArg(*this, &Init, 1),
6023 if (Result.isInvalid()) {
6024 VDecl->setInvalidDecl();
6028 Init = Result.takeAs<Expr>();
6031 // C++ [class.mem]p4:
6032 // A member-declarator can contain a constant-initializer only
6033 // if it declares a static member (9.4) of const integral or
6034 // const enumeration type, see 9.4.2.
6036 // C++0x [class.static.data]p3:
6037 // If a non-volatile const static data member is of integral or
6038 // enumeration type, its declaration in the class definition can
6039 // specify a brace-or-equal-initializer in which every initalizer-clause
6040 // that is an assignment-expression is a constant expression. A static
6041 // data member of literal type can be declared in the class definition
6042 // with the constexpr specifier; if so, its declaration shall specify a
6043 // brace-or-equal-initializer in which every initializer-clause that is
6044 // an assignment-expression is a constant expression.
6045 QualType T = VDecl->getType();
6047 // Do nothing on dependent types.
6048 if (T->isDependentType()) {
6050 // Allow any 'static constexpr' members, whether or not they are of literal
6051 // type. We separately check that the initializer is a constant expression,
6052 // which implicitly requires the member to be of literal type.
6053 } else if (VDecl->isConstexpr()) {
6055 // Require constness.
6056 } else if (!T.isConstQualified()) {
6057 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const)
6058 << Init->getSourceRange();
6059 VDecl->setInvalidDecl();
6061 // We allow integer constant expressions in all cases.
6062 } else if (T->isIntegralOrEnumerationType()) {
6063 // Check whether the expression is a constant expression.
6065 if (getLangOptions().CPlusPlus0x && T.isVolatileQualified())
6066 // In C++0x, a non-constexpr const static data member with an
6067 // in-class initializer cannot be volatile.
6068 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile);
6069 else if (Init->isValueDependent())
6070 ; // Nothing to check.
6071 else if (Init->isIntegerConstantExpr(Context, &Loc))
6072 ; // Ok, it's an ICE!
6073 else if (Init->isEvaluatable(Context)) {
6074 // If we can constant fold the initializer through heroics, accept it,
6075 // but report this as a use of an extension for -pedantic.
6076 Diag(Loc, diag::ext_in_class_initializer_non_constant)
6077 << Init->getSourceRange();
6079 // Otherwise, this is some crazy unknown case. Report the issue at the
6080 // location provided by the isIntegerConstantExpr failed check.
6081 Diag(Loc, diag::err_in_class_initializer_non_constant)
6082 << Init->getSourceRange();
6083 VDecl->setInvalidDecl();
6086 // We allow floating-point constants as an extension.
6087 } else if (T->isFloatingType()) { // also permits complex, which is ok
6088 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type)
6089 << T << Init->getSourceRange();
6090 if (getLangOptions().CPlusPlus0x)
6091 Diag(VDecl->getLocation(),
6092 diag::note_in_class_initializer_float_type_constexpr)
6093 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr ");
6095 if (!Init->isValueDependent() &&
6096 !Init->isConstantInitializer(Context, false)) {
6097 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant)
6098 << Init->getSourceRange();
6099 VDecl->setInvalidDecl();
6102 // Suggest adding 'constexpr' in C++0x for literal types.
6103 } else if (getLangOptions().CPlusPlus0x && T->isLiteralType()) {
6104 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type)
6105 << T << Init->getSourceRange()
6106 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr ");
6107 VDecl->setConstexpr(true);
6110 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type)
6111 << T << Init->getSourceRange();
6112 VDecl->setInvalidDecl();
6114 } else if (VDecl->isFileVarDecl()) {
6115 if (VDecl->getStorageClassAsWritten() == SC_Extern &&
6116 (!getLangOptions().CPlusPlus ||
6117 !Context.getBaseElementType(VDecl->getType()).isConstQualified()))
6118 Diag(VDecl->getLocation(), diag::warn_extern_init);
6119 if (!VDecl->isInvalidDecl()) {
6120 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1);
6121 ExprResult Result = InitSeq.Perform(*this, Entity, Kind,
6122 MultiExprArg(*this, &Init, 1),
6124 if (Result.isInvalid()) {
6125 VDecl->setInvalidDecl();
6129 Init = Result.takeAs<Expr>();
6132 // C++ 3.6.2p2, allow dynamic initialization of static initializers.
6133 // Don't check invalid declarations to avoid emitting useless diagnostics.
6134 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) {
6135 // C99 6.7.8p4. All file scoped initializers need to be constant.
6136 CheckForConstantInitializer(Init, DclT);
6139 // If the type changed, it means we had an incomplete type that was
6140 // completed by the initializer. For example:
6141 // int ary[] = { 1, 3, 5 };
6142 // "ary" transitions from a VariableArrayType to a ConstantArrayType.
6143 if (!VDecl->isInvalidDecl() && (DclT != SavT)) {
6144 VDecl->setType(DclT);
6145 Init->setType(DclT);
6148 // Check any implicit conversions within the expression.
6149 CheckImplicitConversions(Init, VDecl->getLocation());
6151 if (!VDecl->isInvalidDecl())
6152 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init);
6154 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() &&
6155 !VDecl->getType()->isDependentType() &&
6156 !Init->isTypeDependent() && !Init->isValueDependent() &&
6157 !Init->isConstantInitializer(Context,
6158 VDecl->getType()->isReferenceType())) {
6159 // FIXME: Improve this diagnostic to explain why the initializer is not
6160 // a constant expression.
6161 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init)
6162 << VDecl << Init->getSourceRange();
6165 Init = MaybeCreateExprWithCleanups(Init);
6166 // Attach the initializer to the decl.
6167 VDecl->setInit(Init);
6169 CheckCompleteVariableDeclaration(VDecl);
6172 /// ActOnInitializerError - Given that there was an error parsing an
6173 /// initializer for the given declaration, try to return to some form
6175 void Sema::ActOnInitializerError(Decl *D) {
6176 // Our main concern here is re-establishing invariants like "a
6177 // variable's type is either dependent or complete".
6178 if (!D || D->isInvalidDecl()) return;
6180 VarDecl *VD = dyn_cast<VarDecl>(D);
6183 // Auto types are meaningless if we can't make sense of the initializer.
6184 if (ParsingInitForAutoVars.count(D)) {
6185 D->setInvalidDecl();
6189 QualType Ty = VD->getType();
6190 if (Ty->isDependentType()) return;
6192 // Require a complete type.
6193 if (RequireCompleteType(VD->getLocation(),
6194 Context.getBaseElementType(Ty),
6195 diag::err_typecheck_decl_incomplete_type)) {
6196 VD->setInvalidDecl();
6200 // Require an abstract type.
6201 if (RequireNonAbstractType(VD->getLocation(), Ty,
6202 diag::err_abstract_type_in_decl,
6203 AbstractVariableType)) {
6204 VD->setInvalidDecl();
6208 // Don't bother complaining about constructors or destructors,
6212 void Sema::ActOnUninitializedDecl(Decl *RealDecl,
6213 bool TypeMayContainAuto) {
6214 // If there is no declaration, there was an error parsing it. Just ignore it.
6218 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) {
6219 QualType Type = Var->getType();
6221 // C++0x [dcl.spec.auto]p3
6222 if (TypeMayContainAuto && Type->getContainedAutoType()) {
6223 Diag(Var->getLocation(), diag::err_auto_var_requires_init)
6224 << Var->getDeclName() << Type;
6225 Var->setInvalidDecl();
6229 // C++0x [dcl.constexpr]p9: An object or reference declared constexpr must
6230 // have an initializer.
6231 // C++0x [class.static.data]p3: A static data member can be declared with
6232 // the constexpr specifier; if so, its declaration shall specify
6233 // a brace-or-equal-initializer.
6235 // A static data member's definition may inherit an initializer from an
6236 // in-class declaration.
6237 if (Var->isConstexpr() && !Var->getAnyInitializer()) {
6238 Diag(Var->getLocation(), diag::err_constexpr_var_requires_init)
6239 << Var->getDeclName();
6240 Var->setInvalidDecl();
6244 switch (Var->isThisDeclarationADefinition()) {
6245 case VarDecl::Definition:
6246 if (!Var->isStaticDataMember() || !Var->getAnyInitializer())
6249 // We have an out-of-line definition of a static data member
6250 // that has an in-class initializer, so we type-check this like
6255 case VarDecl::DeclarationOnly:
6256 // It's only a declaration.
6258 // Block scope. C99 6.7p7: If an identifier for an object is
6259 // declared with no linkage (C99 6.2.2p6), the type for the
6260 // object shall be complete.
6261 if (!Type->isDependentType() && Var->isLocalVarDecl() &&
6262 !Var->getLinkage() && !Var->isInvalidDecl() &&
6263 RequireCompleteType(Var->getLocation(), Type,
6264 diag::err_typecheck_decl_incomplete_type))
6265 Var->setInvalidDecl();
6267 // Make sure that the type is not abstract.
6268 if (!Type->isDependentType() && !Var->isInvalidDecl() &&
6269 RequireNonAbstractType(Var->getLocation(), Type,
6270 diag::err_abstract_type_in_decl,
6271 AbstractVariableType))
6272 Var->setInvalidDecl();
6275 case VarDecl::TentativeDefinition:
6276 // File scope. C99 6.9.2p2: A declaration of an identifier for an
6277 // object that has file scope without an initializer, and without a
6278 // storage-class specifier or with the storage-class specifier "static",
6279 // constitutes a tentative definition. Note: A tentative definition with
6280 // external linkage is valid (C99 6.2.2p5).
6281 if (!Var->isInvalidDecl()) {
6282 if (const IncompleteArrayType *ArrayT
6283 = Context.getAsIncompleteArrayType(Type)) {
6284 if (RequireCompleteType(Var->getLocation(),
6285 ArrayT->getElementType(),
6286 diag::err_illegal_decl_array_incomplete_type))
6287 Var->setInvalidDecl();
6288 } else if (Var->getStorageClass() == SC_Static) {
6289 // C99 6.9.2p3: If the declaration of an identifier for an object is
6290 // a tentative definition and has internal linkage (C99 6.2.2p3), the
6291 // declared type shall not be an incomplete type.
6292 // NOTE: code such as the following
6294 // struct s { int a; };
6295 // is accepted by gcc. Hence here we issue a warning instead of
6296 // an error and we do not invalidate the static declaration.
6297 // NOTE: to avoid multiple warnings, only check the first declaration.
6298 if (Var->getPreviousDeclaration() == 0)
6299 RequireCompleteType(Var->getLocation(), Type,
6300 diag::ext_typecheck_decl_incomplete_type);
6304 // Record the tentative definition; we're done.
6305 if (!Var->isInvalidDecl())
6306 TentativeDefinitions.push_back(Var);
6310 // Provide a specific diagnostic for uninitialized variable
6311 // definitions with incomplete array type.
6312 if (Type->isIncompleteArrayType()) {
6313 Diag(Var->getLocation(),
6314 diag::err_typecheck_incomplete_array_needs_initializer);
6315 Var->setInvalidDecl();
6319 // Provide a specific diagnostic for uninitialized variable
6320 // definitions with reference type.
6321 if (Type->isReferenceType()) {
6322 Diag(Var->getLocation(), diag::err_reference_var_requires_init)
6323 << Var->getDeclName()
6324 << SourceRange(Var->getLocation(), Var->getLocation());
6325 Var->setInvalidDecl();
6329 // Do not attempt to type-check the default initializer for a
6330 // variable with dependent type.
6331 if (Type->isDependentType())
6334 if (Var->isInvalidDecl())
6337 if (RequireCompleteType(Var->getLocation(),
6338 Context.getBaseElementType(Type),
6339 diag::err_typecheck_decl_incomplete_type)) {
6340 Var->setInvalidDecl();
6344 // The variable can not have an abstract class type.
6345 if (RequireNonAbstractType(Var->getLocation(), Type,
6346 diag::err_abstract_type_in_decl,
6347 AbstractVariableType)) {
6348 Var->setInvalidDecl();
6352 // Check for jumps past the implicit initializer. C++0x
6353 // clarifies that this applies to a "variable with automatic
6354 // storage duration", not a "local variable".
6355 // C++0x [stmt.dcl]p3
6356 // A program that jumps from a point where a variable with automatic
6357 // storage duration is not in scope to a point where it is in scope is
6358 // ill-formed unless the variable has scalar type, class type with a
6359 // trivial default constructor and a trivial destructor, a cv-qualified
6360 // version of one of these types, or an array of one of the preceding
6361 // types and is declared without an initializer.
6362 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) {
6363 if (const RecordType *Record
6364 = Context.getBaseElementType(Type)->getAs<RecordType>()) {
6365 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl());
6366 if ((!getLangOptions().CPlusPlus0x && !CXXRecord->isPOD()) ||
6367 (getLangOptions().CPlusPlus0x &&
6368 (!CXXRecord->hasTrivialDefaultConstructor() ||
6369 !CXXRecord->hasTrivialDestructor())))
6370 getCurFunction()->setHasBranchProtectedScope();
6374 // C++03 [dcl.init]p9:
6375 // If no initializer is specified for an object, and the
6376 // object is of (possibly cv-qualified) non-POD class type (or
6377 // array thereof), the object shall be default-initialized; if
6378 // the object is of const-qualified type, the underlying class
6379 // type shall have a user-declared default
6380 // constructor. Otherwise, if no initializer is specified for
6381 // a non- static object, the object and its subobjects, if
6382 // any, have an indeterminate initial value); if the object
6383 // or any of its subobjects are of const-qualified type, the
6384 // program is ill-formed.
6385 // C++0x [dcl.init]p11:
6386 // If no initializer is specified for an object, the object is
6387 // default-initialized; [...].
6388 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var);
6389 InitializationKind Kind
6390 = InitializationKind::CreateDefault(Var->getLocation());
6392 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0);
6393 ExprResult Init = InitSeq.Perform(*this, Entity, Kind,
6394 MultiExprArg(*this, 0, 0));
6395 if (Init.isInvalid())
6396 Var->setInvalidDecl();
6397 else if (Init.get())
6398 Var->setInit(MaybeCreateExprWithCleanups(Init.get()));
6400 CheckCompleteVariableDeclaration(Var);
6404 void Sema::ActOnCXXForRangeDecl(Decl *D) {
6405 VarDecl *VD = dyn_cast<VarDecl>(D);
6407 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var);
6408 D->setInvalidDecl();
6412 VD->setCXXForRangeDecl(true);
6414 // for-range-declaration cannot be given a storage class specifier.
6416 switch (VD->getStorageClassAsWritten()) {
6425 case SC_PrivateExtern:
6434 case SC_OpenCLWorkGroupLocal:
6435 llvm_unreachable("Unexpected storage class");
6437 if (VD->isConstexpr())
6440 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class)
6441 << VD->getDeclName() << Error;
6442 D->setInvalidDecl();
6446 void Sema::CheckCompleteVariableDeclaration(VarDecl *var) {
6447 if (var->isInvalidDecl()) return;
6449 // In ARC, don't allow jumps past the implicit initialization of a
6450 // local retaining variable.
6451 if (getLangOptions().ObjCAutoRefCount &&
6452 var->hasLocalStorage()) {
6453 switch (var->getType().getObjCLifetime()) {
6454 case Qualifiers::OCL_None:
6455 case Qualifiers::OCL_ExplicitNone:
6456 case Qualifiers::OCL_Autoreleasing:
6459 case Qualifiers::OCL_Weak:
6460 case Qualifiers::OCL_Strong:
6461 getCurFunction()->setHasBranchProtectedScope();
6466 // All the following checks are C++ only.
6467 if (!getLangOptions().CPlusPlus) return;
6469 QualType baseType = Context.getBaseElementType(var->getType());
6470 if (baseType->isDependentType()) return;
6472 // __block variables might require us to capture a copy-initializer.
6473 if (var->hasAttr<BlocksAttr>()) {
6474 // It's currently invalid to ever have a __block variable with an
6475 // array type; should we diagnose that here?
6477 // Regardless, we don't want to ignore array nesting when
6478 // constructing this copy.
6479 QualType type = var->getType();
6481 if (type->isStructureOrClassType()) {
6482 SourceLocation poi = var->getLocation();
6483 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi);
6485 PerformCopyInitialization(
6486 InitializedEntity::InitializeBlock(poi, type, false),
6487 poi, Owned(varRef));
6488 if (!result.isInvalid()) {
6489 result = MaybeCreateExprWithCleanups(result);
6490 Expr *init = result.takeAs<Expr>();
6491 Context.setBlockVarCopyInits(var, init);
6496 // Check for global constructors.
6497 if (!var->getDeclContext()->isDependentContext() &&
6498 var->hasGlobalStorage() &&
6499 !var->isStaticLocal() &&
6501 !var->getInit()->isConstantInitializer(Context,
6502 baseType->isReferenceType()))
6503 Diag(var->getLocation(), diag::warn_global_constructor)
6504 << var->getInit()->getSourceRange();
6506 // Require the destructor.
6507 if (const RecordType *recordType = baseType->getAs<RecordType>())
6508 FinalizeVarWithDestructor(var, recordType);
6511 /// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform
6512 /// any semantic actions necessary after any initializer has been attached.
6514 Sema::FinalizeDeclaration(Decl *ThisDecl) {
6515 // Note that we are no longer parsing the initializer for this declaration.
6516 ParsingInitForAutoVars.erase(ThisDecl);
6519 Sema::DeclGroupPtrTy
6520 Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS,
6521 Decl **Group, unsigned NumDecls) {
6522 SmallVector<Decl*, 8> Decls;
6524 if (DS.isTypeSpecOwned())
6525 Decls.push_back(DS.getRepAsDecl());
6527 for (unsigned i = 0; i != NumDecls; ++i)
6528 if (Decl *D = Group[i])
6531 return BuildDeclaratorGroup(Decls.data(), Decls.size(),
6532 DS.getTypeSpecType() == DeclSpec::TST_auto);
6535 /// BuildDeclaratorGroup - convert a list of declarations into a declaration
6536 /// group, performing any necessary semantic checking.
6537 Sema::DeclGroupPtrTy
6538 Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls,
6539 bool TypeMayContainAuto) {
6540 // C++0x [dcl.spec.auto]p7:
6541 // If the type deduced for the template parameter U is not the same in each
6542 // deduction, the program is ill-formed.
6543 // FIXME: When initializer-list support is added, a distinction is needed
6544 // between the deduced type U and the deduced type which 'auto' stands for.
6545 // auto a = 0, b = { 1, 2, 3 };
6546 // is legal because the deduced type U is 'int' in both cases.
6547 if (TypeMayContainAuto && NumDecls > 1) {
6549 CanQualType DeducedCanon;
6550 VarDecl *DeducedDecl = 0;
6551 for (unsigned i = 0; i != NumDecls; ++i) {
6552 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) {
6553 AutoType *AT = D->getType()->getContainedAutoType();
6554 // Don't reissue diagnostics when instantiating a template.
6555 if (AT && D->isInvalidDecl())
6557 if (AT && AT->isDeduced()) {
6558 QualType U = AT->getDeducedType();
6559 CanQualType UCanon = Context.getCanonicalType(U);
6560 if (Deduced.isNull()) {
6562 DeducedCanon = UCanon;
6564 } else if (DeducedCanon != UCanon) {
6565 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(),
6566 diag::err_auto_different_deductions)
6567 << Deduced << DeducedDecl->getDeclName()
6568 << U << D->getDeclName()
6569 << DeducedDecl->getInit()->getSourceRange()
6570 << D->getInit()->getSourceRange();
6571 D->setInvalidDecl();
6579 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls));
6583 /// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator()
6584 /// to introduce parameters into function prototype scope.
6585 Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) {
6586 const DeclSpec &DS = D.getDeclSpec();
6588 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'.
6589 VarDecl::StorageClass StorageClass = SC_None;
6590 VarDecl::StorageClass StorageClassAsWritten = SC_None;
6591 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) {
6592 StorageClass = SC_Register;
6593 StorageClassAsWritten = SC_Register;
6594 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) {
6595 Diag(DS.getStorageClassSpecLoc(),
6596 diag::err_invalid_storage_class_in_func_decl);
6597 D.getMutableDeclSpec().ClearStorageClassSpecs();
6600 if (D.getDeclSpec().isThreadSpecified())
6601 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
6602 if (D.getDeclSpec().isConstexprSpecified())
6603 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr)
6606 DiagnoseFunctionSpecifiers(D);
6608 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
6609 QualType parmDeclType = TInfo->getType();
6611 if (getLangOptions().CPlusPlus) {
6612 // Check that there are no default arguments inside the type of this
6614 CheckExtraCXXDefaultArguments(D);
6616 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1).
6617 if (D.getCXXScopeSpec().isSet()) {
6618 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator)
6619 << D.getCXXScopeSpec().getRange();
6620 D.getCXXScopeSpec().clear();
6624 // Ensure we have a valid name
6625 IdentifierInfo *II = 0;
6627 II = D.getIdentifier();
6629 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name)
6630 << GetNameForDeclarator(D).getName().getAsString();
6631 D.setInvalidType(true);
6635 // Check for redeclaration of parameters, e.g. int foo(int x, int x);
6637 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName,
6640 if (R.isSingleResult()) {
6641 NamedDecl *PrevDecl = R.getFoundDecl();
6642 if (PrevDecl->isTemplateParameter()) {
6643 // Maybe we will complain about the shadowed template parameter.
6644 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
6645 // Just pretend that we didn't see the previous declaration.
6647 } else if (S->isDeclScope(PrevDecl)) {
6648 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II;
6649 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
6651 // Recover by removing the name
6653 D.SetIdentifier(0, D.getIdentifierLoc());
6654 D.setInvalidType(true);
6659 // Temporarily put parameter variables in the translation unit, not
6660 // the enclosing context. This prevents them from accidentally
6661 // looking like class members in C++.
6662 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(),
6663 D.getSourceRange().getBegin(),
6664 D.getIdentifierLoc(), II,
6665 parmDeclType, TInfo,
6666 StorageClass, StorageClassAsWritten);
6668 if (D.isInvalidType())
6669 New->setInvalidDecl();
6671 assert(S->isFunctionPrototypeScope());
6672 assert(S->getFunctionPrototypeDepth() >= 1);
6673 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1,
6674 S->getNextFunctionPrototypeIndex());
6676 // Add the parameter declaration into this scope.
6679 IdResolver.AddDecl(New);
6681 ProcessDeclAttributes(S, New, D);
6683 if (D.getDeclSpec().isModulePrivateSpecified())
6684 Diag(New->getLocation(), diag::err_module_private_local)
6685 << 1 << New->getDeclName()
6686 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
6687 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
6689 if (New->hasAttr<BlocksAttr>()) {
6690 Diag(New->getLocation(), diag::err_block_on_nonlocal);
6695 /// \brief Synthesizes a variable for a parameter arising from a
6697 ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC,
6700 /* FIXME: setting StartLoc == Loc.
6701 Would it be worth to modify callers so as to provide proper source
6702 location for the unnamed parameters, embedding the parameter's type? */
6703 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0,
6704 T, Context.getTrivialTypeSourceInfo(T, Loc),
6705 SC_None, SC_None, 0);
6706 Param->setImplicit();
6710 void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param,
6711 ParmVarDecl * const *ParamEnd) {
6712 // Don't diagnose unused-parameter errors in template instantiations; we
6713 // will already have done so in the template itself.
6714 if (!ActiveTemplateInstantiations.empty())
6717 for (; Param != ParamEnd; ++Param) {
6718 if (!(*Param)->isUsed() && (*Param)->getDeclName() &&
6719 !(*Param)->hasAttr<UnusedAttr>()) {
6720 Diag((*Param)->getLocation(), diag::warn_unused_parameter)
6721 << (*Param)->getDeclName();
6726 void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param,
6727 ParmVarDecl * const *ParamEnd,
6730 if (LangOpts.NumLargeByValueCopy == 0) // No check.
6733 // Warn if the return value is pass-by-value and larger than the specified
6735 if (ReturnTy.isPODType(Context)) {
6736 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity();
6737 if (Size > LangOpts.NumLargeByValueCopy)
6738 Diag(D->getLocation(), diag::warn_return_value_size)
6739 << D->getDeclName() << Size;
6742 // Warn if any parameter is pass-by-value and larger than the specified
6744 for (; Param != ParamEnd; ++Param) {
6745 QualType T = (*Param)->getType();
6746 if (!T.isPODType(Context))
6748 unsigned Size = Context.getTypeSizeInChars(T).getQuantity();
6749 if (Size > LangOpts.NumLargeByValueCopy)
6750 Diag((*Param)->getLocation(), diag::warn_parameter_size)
6751 << (*Param)->getDeclName() << Size;
6755 ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc,
6756 SourceLocation NameLoc, IdentifierInfo *Name,
6757 QualType T, TypeSourceInfo *TSInfo,
6758 VarDecl::StorageClass StorageClass,
6759 VarDecl::StorageClass StorageClassAsWritten) {
6760 // In ARC, infer a lifetime qualifier for appropriate parameter types.
6761 if (getLangOptions().ObjCAutoRefCount &&
6762 T.getObjCLifetime() == Qualifiers::OCL_None &&
6763 T->isObjCLifetimeType()) {
6765 Qualifiers::ObjCLifetime lifetime;
6767 // Special cases for arrays:
6768 // - if it's const, use __unsafe_unretained
6769 // - otherwise, it's an error
6770 if (T->isArrayType()) {
6771 if (!T.isConstQualified()) {
6772 DelayedDiagnostics.add(
6773 sema::DelayedDiagnostic::makeForbiddenType(
6774 NameLoc, diag::err_arc_array_param_no_ownership, T, false));
6776 lifetime = Qualifiers::OCL_ExplicitNone;
6778 lifetime = T->getObjCARCImplicitLifetime();
6780 T = Context.getLifetimeQualifiedType(T, lifetime);
6783 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name,
6784 Context.getAdjustedParameterType(T),
6786 StorageClass, StorageClassAsWritten,
6789 // Parameters can not be abstract class types.
6790 // For record types, this is done by the AbstractClassUsageDiagnoser once
6791 // the class has been completely parsed.
6792 if (!CurContext->isRecord() &&
6793 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl,
6795 New->setInvalidDecl();
6797 // Parameter declarators cannot be interface types. All ObjC objects are
6798 // passed by reference.
6799 if (T->isObjCObjectType()) {
6801 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T
6802 << FixItHint::CreateInsertion(NameLoc, "*");
6803 T = Context.getObjCObjectPointerType(T);
6807 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage
6808 // duration shall not be qualified by an address-space qualifier."
6809 // Since all parameters have automatic store duration, they can not have
6810 // an address space.
6811 if (T.getAddressSpace() != 0) {
6812 Diag(NameLoc, diag::err_arg_with_address_space);
6813 New->setInvalidDecl();
6819 void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D,
6820 SourceLocation LocAfterDecls) {
6821 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
6823 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared'
6824 // for a K&R function.
6825 if (!FTI.hasPrototype) {
6826 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) {
6828 if (FTI.ArgInfo[i].Param == 0) {
6829 llvm::SmallString<256> Code;
6830 llvm::raw_svector_ostream(Code) << " int "
6831 << FTI.ArgInfo[i].Ident->getName()
6833 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared)
6834 << FTI.ArgInfo[i].Ident
6835 << FixItHint::CreateInsertion(LocAfterDecls, Code.str());
6837 // Implicitly declare the argument as type 'int' for lack of a better
6839 AttributeFactory attrs;
6841 const char* PrevSpec; // unused
6842 unsigned DiagID; // unused
6843 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc,
6845 Declarator ParamD(DS, Declarator::KNRTypeListContext);
6846 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc);
6847 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD);
6853 Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope,
6855 assert(getCurFunctionDecl() == 0 && "Function parsing confused");
6856 assert(D.isFunctionDeclarator() && "Not a function declarator!");
6857 Scope *ParentScope = FnBodyScope->getParent();
6859 D.setFunctionDefinition(true);
6860 Decl *DP = HandleDeclarator(ParentScope, D,
6861 MultiTemplateParamsArg(*this));
6862 return ActOnStartOfFunctionDef(FnBodyScope, DP);
6865 static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) {
6866 // Don't warn about invalid declarations.
6867 if (FD->isInvalidDecl())
6870 // Or declarations that aren't global.
6871 if (!FD->isGlobal())
6874 // Don't warn about C++ member functions.
6875 if (isa<CXXMethodDecl>(FD))
6878 // Don't warn about 'main'.
6882 // Don't warn about inline functions.
6883 if (FD->isInlined())
6886 // Don't warn about function templates.
6887 if (FD->getDescribedFunctionTemplate())
6890 // Don't warn about function template specializations.
6891 if (FD->isFunctionTemplateSpecialization())
6894 bool MissingPrototype = true;
6895 for (const FunctionDecl *Prev = FD->getPreviousDeclaration();
6896 Prev; Prev = Prev->getPreviousDeclaration()) {
6897 // Ignore any declarations that occur in function or method
6898 // scope, because they aren't visible from the header.
6899 if (Prev->getDeclContext()->isFunctionOrMethod())
6902 MissingPrototype = !Prev->getType()->isFunctionProtoType();
6906 return MissingPrototype;
6909 void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) {
6910 // Don't complain if we're in GNU89 mode and the previous definition
6911 // was an extern inline function.
6912 const FunctionDecl *Definition;
6913 if (FD->isDefined(Definition) &&
6914 !canRedefineFunction(Definition, getLangOptions())) {
6915 if (getLangOptions().GNUMode && Definition->isInlineSpecified() &&
6916 Definition->getStorageClass() == SC_Extern)
6917 Diag(FD->getLocation(), diag::err_redefinition_extern_inline)
6918 << FD->getDeclName() << getLangOptions().CPlusPlus;
6920 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName();
6921 Diag(Definition->getLocation(), diag::note_previous_definition);
6925 Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) {
6926 // Clear the last template instantiation error context.
6927 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation();
6931 FunctionDecl *FD = 0;
6933 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D))
6934 FD = FunTmpl->getTemplatedDecl();
6936 FD = cast<FunctionDecl>(D);
6938 // Enter a new function scope
6939 PushFunctionScope();
6941 // See if this is a redefinition.
6942 if (!FD->isLateTemplateParsed())
6943 CheckForFunctionRedefinition(FD);
6945 // Builtin functions cannot be defined.
6946 if (unsigned BuiltinID = FD->getBuiltinID()) {
6947 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) {
6948 Diag(FD->getLocation(), diag::err_builtin_definition) << FD;
6949 FD->setInvalidDecl();
6953 // The return type of a function definition must be complete
6954 // (C99 6.9.1p3, C++ [dcl.fct]p6).
6955 QualType ResultType = FD->getResultType();
6956 if (!ResultType->isDependentType() && !ResultType->isVoidType() &&
6957 !FD->isInvalidDecl() &&
6958 RequireCompleteType(FD->getLocation(), ResultType,
6959 diag::err_func_def_incomplete_result))
6960 FD->setInvalidDecl();
6962 // GNU warning -Wmissing-prototypes:
6963 // Warn if a global function is defined without a previous
6964 // prototype declaration. This warning is issued even if the
6965 // definition itself provides a prototype. The aim is to detect
6966 // global functions that fail to be declared in header files.
6967 if (ShouldWarnAboutMissingPrototype(FD))
6968 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD;
6971 PushDeclContext(FnBodyScope, FD);
6973 // Check the validity of our function parameters
6974 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(),
6975 /*CheckParameterNames=*/true);
6977 // Introduce our parameters into the function scope
6978 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) {
6979 ParmVarDecl *Param = FD->getParamDecl(p);
6980 Param->setOwningFunction(FD);
6982 // If this has an identifier, add it to the scope stack.
6983 if (Param->getIdentifier() && FnBodyScope) {
6984 CheckShadow(FnBodyScope, Param);
6986 PushOnScopeChains(Param, FnBodyScope);
6990 // Checking attributes of current function definition
6991 // dllimport attribute.
6992 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>();
6993 if (DA && (!FD->getAttr<DLLExportAttr>())) {
6994 // dllimport attribute cannot be directly applied to definition.
6995 // Microsoft accepts dllimport for functions defined within class scope.
6996 if (!DA->isInherited() &&
6997 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) {
6998 Diag(FD->getLocation(),
6999 diag::err_attribute_can_be_applied_only_to_symbol_declaration)
7001 FD->setInvalidDecl();
7005 // Visual C++ appears to not think this is an issue, so only issue
7006 // a warning when Microsoft extensions are disabled.
7007 if (!LangOpts.MicrosoftExt) {
7008 // If a symbol previously declared dllimport is later defined, the
7009 // attribute is ignored in subsequent references, and a warning is
7011 Diag(FD->getLocation(),
7012 diag::warn_redeclaration_without_attribute_prev_attribute_ignored)
7013 << FD->getName() << "dllimport";
7019 /// \brief Given the set of return statements within a function body,
7020 /// compute the variables that are subject to the named return value
7023 /// Each of the variables that is subject to the named return value
7024 /// optimization will be marked as NRVO variables in the AST, and any
7025 /// return statement that has a marked NRVO variable as its NRVO candidate can
7026 /// use the named return value optimization.
7028 /// This function applies a very simplistic algorithm for NRVO: if every return
7029 /// statement in the function has the same NRVO candidate, that candidate is
7030 /// the NRVO variable.
7032 /// FIXME: Employ a smarter algorithm that accounts for multiple return
7033 /// statements and the lifetimes of the NRVO candidates. We should be able to
7034 /// find a maximal set of NRVO variables.
7035 void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) {
7036 ReturnStmt **Returns = Scope->Returns.data();
7038 const VarDecl *NRVOCandidate = 0;
7039 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) {
7040 if (!Returns[I]->getNRVOCandidate())
7044 NRVOCandidate = Returns[I]->getNRVOCandidate();
7045 else if (NRVOCandidate != Returns[I]->getNRVOCandidate())
7050 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true);
7053 Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) {
7054 return ActOnFinishFunctionBody(D, move(BodyArg), false);
7057 Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body,
7058 bool IsInstantiation) {
7059 FunctionDecl *FD = 0;
7060 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl);
7062 FD = FunTmpl->getTemplatedDecl();
7064 FD = dyn_cast_or_null<FunctionDecl>(dcl);
7066 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy();
7067 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0;
7072 // C and C++ allow for main to automagically return 0.
7073 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3.
7074 FD->setHasImplicitReturnZero(true);
7075 WP.disableCheckFallThrough();
7076 } else if (FD->hasAttr<NakedAttr>()) {
7077 // If the function is marked 'naked', don't complain about missing return
7079 WP.disableCheckFallThrough();
7082 // MSVC permits the use of pure specifier (=0) on function definition,
7083 // defined at class scope, warn about this non standard construct.
7084 if (getLangOptions().MicrosoftExt && FD->isPure())
7085 Diag(FD->getLocation(), diag::warn_pure_function_definition);
7087 if (!FD->isInvalidDecl()) {
7088 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end());
7089 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(),
7090 FD->getResultType(), FD);
7092 // If this is a constructor, we need a vtable.
7093 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD))
7094 MarkVTableUsed(FD->getLocation(), Constructor->getParent());
7096 computeNRVO(Body, getCurFunction());
7099 assert(FD == getCurFunctionDecl() && "Function parsing confused");
7100 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) {
7101 assert(MD == getCurMethodDecl() && "Method parsing confused");
7104 MD->setEndLoc(Body->getLocEnd());
7105 if (!MD->isInvalidDecl()) {
7106 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end());
7107 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(),
7108 MD->getResultType(), MD);
7111 computeNRVO(Body, getCurFunction());
7113 if (ObjCShouldCallSuperDealloc) {
7114 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc);
7115 ObjCShouldCallSuperDealloc = false;
7117 if (ObjCShouldCallSuperFinalize) {
7118 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize);
7119 ObjCShouldCallSuperFinalize = false;
7125 assert(!ObjCShouldCallSuperDealloc && "This should only be set for "
7126 "ObjC methods, which should have been handled in the block above.");
7127 assert(!ObjCShouldCallSuperFinalize && "This should only be set for "
7128 "ObjC methods, which should have been handled in the block above.");
7130 // Verify and clean out per-function state.
7132 // C++ constructors that have function-try-blocks can't have return
7133 // statements in the handlers of that block. (C++ [except.handle]p14)
7135 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body))
7136 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body));
7138 // Verify that gotos and switch cases don't jump into scopes illegally.
7139 if (getCurFunction()->NeedsScopeChecking() &&
7140 !dcl->isInvalidDecl() &&
7141 !hasAnyUnrecoverableErrorsInThisFunction())
7142 DiagnoseInvalidJumps(Body);
7144 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) {
7145 if (!Destructor->getParent()->isDependentType())
7146 CheckDestructor(Destructor);
7148 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(),
7149 Destructor->getParent());
7152 // If any errors have occurred, clear out any temporaries that may have
7153 // been leftover. This ensures that these temporaries won't be picked up for
7154 // deletion in some later function.
7155 if (PP.getDiagnostics().hasErrorOccurred() ||
7156 PP.getDiagnostics().getSuppressAllDiagnostics()) {
7157 ExprTemporaries.clear();
7158 ExprNeedsCleanups = false;
7159 } else if (!isa<FunctionTemplateDecl>(dcl)) {
7160 // Since the body is valid, issue any analysis-based warnings that are
7165 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() &&
7166 !CheckConstexprFunctionBody(FD, Body))
7167 FD->setInvalidDecl();
7169 assert(ExprTemporaries.empty() && "Leftover temporaries in function");
7170 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function");
7173 if (!IsInstantiation)
7176 PopFunctionOrBlockScope(ActivePolicy, dcl);
7178 // If any errors have occurred, clear out any temporaries that may have
7179 // been leftover. This ensures that these temporaries won't be picked up for
7180 // deletion in some later function.
7181 if (getDiagnostics().hasErrorOccurred()) {
7182 ExprTemporaries.clear();
7183 ExprNeedsCleanups = false;
7190 /// When we finish delayed parsing of an attribute, we must attach it to the
7192 void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D,
7193 ParsedAttributes &Attrs) {
7194 ProcessDeclAttributeList(S, D, Attrs.getList());
7198 /// ImplicitlyDefineFunction - An undeclared identifier was used in a function
7199 /// call, forming a call to an implicitly defined function (per C99 6.5.1p2).
7200 NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc,
7201 IdentifierInfo &II, Scope *S) {
7202 // Before we produce a declaration for an implicitly defined
7203 // function, see whether there was a locally-scoped declaration of
7204 // this name as a function or variable. If so, use that
7205 // (non-visible) declaration, and complain about it.
7206 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos
7207 = findLocallyScopedExternalDecl(&II);
7208 if (Pos != LocallyScopedExternalDecls.end()) {
7209 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second;
7210 Diag(Pos->second->getLocation(), diag::note_previous_declaration);
7214 // Extension in C99. Legal in C90, but warn about it.
7215 if (II.getName().startswith("__builtin_"))
7216 Diag(Loc, diag::warn_builtin_unknown) << &II;
7217 else if (getLangOptions().C99)
7218 Diag(Loc, diag::ext_implicit_function_decl) << &II;
7220 Diag(Loc, diag::warn_implicit_function_decl) << &II;
7222 // Set a Declarator for the implicit definition: int foo();
7224 AttributeFactory attrFactory;
7225 DeclSpec DS(attrFactory);
7227 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID);
7228 (void)Error; // Silence warning.
7229 assert(!Error && "Error setting up implicit decl!");
7230 Declarator D(DS, Declarator::BlockContext);
7231 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0,
7232 0, 0, true, SourceLocation(),
7234 EST_None, SourceLocation(),
7235 0, 0, 0, 0, Loc, Loc, D),
7238 D.SetIdentifier(&II, Loc);
7240 // Insert this function into translation-unit scope.
7242 DeclContext *PrevDC = CurContext;
7243 CurContext = Context.getTranslationUnitDecl();
7245 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D));
7248 CurContext = PrevDC;
7250 AddKnownFunctionAttributes(FD);
7255 /// \brief Adds any function attributes that we know a priori based on
7256 /// the declaration of this function.
7258 /// These attributes can apply both to implicitly-declared builtins
7259 /// (like __builtin___printf_chk) or to library-declared functions
7260 /// like NSLog or printf.
7262 /// We need to check for duplicate attributes both here and where user-written
7263 /// attributes are applied to declarations.
7264 void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) {
7265 if (FD->isInvalidDecl())
7268 // If this is a built-in function, map its builtin attributes to
7269 // actual attributes.
7270 if (unsigned BuiltinID = FD->getBuiltinID()) {
7271 // Handle printf-formatting attributes.
7274 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) {
7275 if (!FD->getAttr<FormatAttr>())
7276 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
7277 "printf", FormatIdx+1,
7278 HasVAListArg ? 0 : FormatIdx+2));
7280 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx,
7282 if (!FD->getAttr<FormatAttr>())
7283 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
7284 "scanf", FormatIdx+1,
7285 HasVAListArg ? 0 : FormatIdx+2));
7288 // Mark const if we don't care about errno and that is the only
7289 // thing preventing the function from being const. This allows
7290 // IRgen to use LLVM intrinsics for such functions.
7291 if (!getLangOptions().MathErrno &&
7292 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) {
7293 if (!FD->getAttr<ConstAttr>())
7294 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context));
7297 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) &&
7298 !FD->getAttr<ReturnsTwiceAttr>())
7299 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context));
7300 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>())
7301 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context));
7302 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>())
7303 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context));
7306 IdentifierInfo *Name = FD->getIdentifier();
7309 if ((!getLangOptions().CPlusPlus &&
7310 FD->getDeclContext()->isTranslationUnit()) ||
7311 (isa<LinkageSpecDecl>(FD->getDeclContext()) &&
7312 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() ==
7313 LinkageSpecDecl::lang_c)) {
7314 // Okay: this could be a libc/libm/Objective-C function we know
7319 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) {
7320 // FIXME: NSLog and NSLogv should be target specific
7321 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) {
7322 // FIXME: We known better than our headers.
7323 const_cast<FormatAttr *>(Format)->setType(Context, "printf");
7325 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
7327 Name->isStr("NSLogv") ? 0 : 2));
7328 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) {
7329 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be
7330 // target-specific builtins, perhaps?
7331 if (!FD->getAttr<FormatAttr>())
7332 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context,
7334 Name->isStr("vasprintf") ? 0 : 3));
7338 TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
7339 TypeSourceInfo *TInfo) {
7340 assert(D.getIdentifier() && "Wrong callback for declspec without declarator");
7341 assert(!T.isNull() && "GetTypeForDeclarator() returned null type");
7344 assert(D.isInvalidType() && "no declarator info for valid type");
7345 TInfo = Context.getTrivialTypeSourceInfo(T);
7348 // Scope manipulation handled by caller.
7349 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext,
7350 D.getSourceRange().getBegin(),
7351 D.getIdentifierLoc(),
7355 // Bail out immediately if we have an invalid declaration.
7356 if (D.isInvalidType()) {
7357 NewTD->setInvalidDecl();
7361 if (D.getDeclSpec().isModulePrivateSpecified()) {
7362 if (CurContext->isFunctionOrMethod())
7363 Diag(NewTD->getLocation(), diag::err_module_private_local)
7364 << 2 << NewTD->getDeclName()
7365 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc())
7366 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc());
7368 NewTD->setModulePrivate();
7371 // C++ [dcl.typedef]p8:
7372 // If the typedef declaration defines an unnamed class (or
7373 // enum), the first typedef-name declared by the declaration
7374 // to be that class type (or enum type) is used to denote the
7375 // class type (or enum type) for linkage purposes only.
7376 // We need to check whether the type was declared in the declaration.
7377 switch (D.getDeclSpec().getTypeSpecType()) {
7382 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl());
7384 // Do nothing if the tag is not anonymous or already has an
7385 // associated typedef (from an earlier typedef in this decl group).
7386 if (tagFromDeclSpec->getIdentifier()) break;
7387 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break;
7389 // A well-formed anonymous tag must always be a TUK_Definition.
7390 assert(tagFromDeclSpec->isThisDeclarationADefinition());
7392 // The type must match the tag exactly; no qualifiers allowed.
7393 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec)))
7396 // Otherwise, set this is the anon-decl typedef for the tag.
7397 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD);
7409 /// \brief Determine whether a tag with a given kind is acceptable
7410 /// as a redeclaration of the given tag declaration.
7412 /// \returns true if the new tag kind is acceptable, false otherwise.
7413 bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous,
7414 TagTypeKind NewTag, bool isDefinition,
7415 SourceLocation NewTagLoc,
7416 const IdentifierInfo &Name) {
7417 // C++ [dcl.type.elab]p3:
7418 // The class-key or enum keyword present in the
7419 // elaborated-type-specifier shall agree in kind with the
7420 // declaration to which the name in the elaborated-type-specifier
7421 // refers. This rule also applies to the form of
7422 // elaborated-type-specifier that declares a class-name or
7423 // friend class since it can be construed as referring to the
7424 // definition of the class. Thus, in any
7425 // elaborated-type-specifier, the enum keyword shall be used to
7426 // refer to an enumeration (7.2), the union class-key shall be
7427 // used to refer to a union (clause 9), and either the class or
7428 // struct class-key shall be used to refer to a class (clause 9)
7429 // declared using the class or struct class-key.
7430 TagTypeKind OldTag = Previous->getTagKind();
7431 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct))
7432 if (OldTag == NewTag)
7435 if ((OldTag == TTK_Struct || OldTag == TTK_Class) &&
7436 (NewTag == TTK_Struct || NewTag == TTK_Class)) {
7437 // Warn about the struct/class tag mismatch.
7438 bool isTemplate = false;
7439 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous))
7440 isTemplate = Record->getDescribedClassTemplate();
7442 if (!ActiveTemplateInstantiations.empty()) {
7443 // In a template instantiation, do not offer fix-its for tag mismatches
7444 // since they usually mess up the template instead of fixing the problem.
7445 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch)
7446 << (NewTag == TTK_Class) << isTemplate << &Name;
7451 // On definitions, check previous tags and issue a fix-it for each
7452 // one that doesn't match the current tag.
7453 if (Previous->getDefinition()) {
7454 // Don't suggest fix-its for redefinitions.
7458 bool previousMismatch = false;
7459 for (TagDecl::redecl_iterator I(Previous->redecls_begin()),
7460 E(Previous->redecls_end()); I != E; ++I) {
7461 if (I->getTagKind() != NewTag) {
7462 if (!previousMismatch) {
7463 previousMismatch = true;
7464 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch)
7465 << (NewTag == TTK_Class) << isTemplate << &Name;
7467 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion)
7468 << (NewTag == TTK_Class)
7469 << FixItHint::CreateReplacement(I->getInnerLocStart(),
7470 NewTag == TTK_Class?
7471 "class" : "struct");
7477 // Check for a previous definition. If current tag and definition
7478 // are same type, do nothing. If no definition, but disagree with
7479 // with previous tag type, give a warning, but no fix-it.
7480 const TagDecl *Redecl = Previous->getDefinition() ?
7481 Previous->getDefinition() : Previous;
7482 if (Redecl->getTagKind() == NewTag) {
7486 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch)
7487 << (NewTag == TTK_Class)
7488 << isTemplate << &Name;
7489 Diag(Redecl->getLocation(), diag::note_previous_use);
7491 // If there is a previous defintion, suggest a fix-it.
7492 if (Previous->getDefinition()) {
7493 Diag(NewTagLoc, diag::note_struct_class_suggestion)
7494 << (Redecl->getTagKind() == TTK_Class)
7495 << FixItHint::CreateReplacement(SourceRange(NewTagLoc),
7496 Redecl->getTagKind() == TTK_Class? "class" : "struct");
7504 /// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the
7505 /// former case, Name will be non-null. In the later case, Name will be null.
7506 /// TagSpec indicates what kind of tag this is. TUK indicates whether this is a
7507 /// reference/declaration/definition of a tag.
7508 Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK,
7509 SourceLocation KWLoc, CXXScopeSpec &SS,
7510 IdentifierInfo *Name, SourceLocation NameLoc,
7511 AttributeList *Attr, AccessSpecifier AS,
7512 SourceLocation ModulePrivateLoc,
7513 MultiTemplateParamsArg TemplateParameterLists,
7514 bool &OwnedDecl, bool &IsDependent,
7515 bool ScopedEnum, bool ScopedEnumUsesClassTag,
7516 TypeResult UnderlyingType) {
7517 // If this is not a definition, it must have a name.
7518 assert((Name != 0 || TUK == TUK_Definition) &&
7519 "Nameless record must be a definition!");
7520 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference);
7523 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec);
7525 // FIXME: Check explicit specializations more carefully.
7526 bool isExplicitSpecialization = false;
7527 bool Invalid = false;
7529 // We only need to do this matching if we have template parameters
7530 // or a scope specifier, which also conveniently avoids this work
7531 // for non-C++ cases.
7532 if (TemplateParameterLists.size() > 0 ||
7533 (SS.isNotEmpty() && TUK != TUK_Reference)) {
7534 if (TemplateParameterList *TemplateParams
7535 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS,
7536 TemplateParameterLists.get(),
7537 TemplateParameterLists.size(),
7539 isExplicitSpecialization,
7541 if (TemplateParams->size() > 0) {
7542 // This is a declaration or definition of a class template (which may
7543 // be a member of another template).
7549 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc,
7550 SS, Name, NameLoc, Attr,
7553 TemplateParameterLists.size() - 1,
7554 (TemplateParameterList**) TemplateParameterLists.release());
7555 return Result.get();
7557 // The "template<>" header is extraneous.
7558 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams)
7559 << TypeWithKeyword::getTagTypeKindName(Kind) << Name;
7560 isExplicitSpecialization = true;
7565 // Figure out the underlying type if this a enum declaration. We need to do
7566 // this early, because it's needed to detect if this is an incompatible
7568 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying;
7570 if (Kind == TTK_Enum) {
7571 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum))
7572 // No underlying type explicitly specified, or we failed to parse the
7573 // type, default to int.
7574 EnumUnderlying = Context.IntTy.getTypePtr();
7575 else if (UnderlyingType.get()) {
7576 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an
7577 // integral type; any cv-qualification is ignored.
7578 TypeSourceInfo *TI = 0;
7579 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI);
7580 EnumUnderlying = TI;
7582 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc();
7584 if (!T->isDependentType() && !T->isIntegralType(Context)) {
7585 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying)
7587 // Recover by falling back to int.
7588 EnumUnderlying = Context.IntTy.getTypePtr();
7591 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI,
7592 UPPC_FixedUnderlyingType))
7593 EnumUnderlying = Context.IntTy.getTypePtr();
7595 } else if (getLangOptions().MicrosoftExt)
7596 // Microsoft enums are always of int type.
7597 EnumUnderlying = Context.IntTy.getTypePtr();
7600 DeclContext *SearchDC = CurContext;
7601 DeclContext *DC = CurContext;
7602 bool isStdBadAlloc = false;
7604 RedeclarationKind Redecl = ForRedeclaration;
7605 if (TUK == TUK_Friend || TUK == TUK_Reference)
7606 Redecl = NotForRedeclaration;
7608 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl);
7610 if (Name && SS.isNotEmpty()) {
7611 // We have a nested-name tag ('struct foo::bar').
7613 // Check for invalid 'foo::'.
7614 if (SS.isInvalid()) {
7619 // If this is a friend or a reference to a class in a dependent
7620 // context, don't try to make a decl for it.
7621 if (TUK == TUK_Friend || TUK == TUK_Reference) {
7622 DC = computeDeclContext(SS, false);
7628 DC = computeDeclContext(SS, true);
7630 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec)
7636 if (RequireCompleteDeclContext(SS, DC))
7640 // Look-up name inside 'foo::'.
7641 LookupQualifiedName(Previous, DC);
7643 if (Previous.isAmbiguous())
7646 if (Previous.empty()) {
7647 // Name lookup did not find anything. However, if the
7648 // nested-name-specifier refers to the current instantiation,
7649 // and that current instantiation has any dependent base
7650 // classes, we might find something at instantiation time: treat
7651 // this as a dependent elaborated-type-specifier.
7652 // But this only makes any sense for reference-like lookups.
7653 if (Previous.wasNotFoundInCurrentInstantiation() &&
7654 (TUK == TUK_Reference || TUK == TUK_Friend)) {
7659 // A tag 'foo::bar' must already exist.
7660 Diag(NameLoc, diag::err_not_tag_in_scope)
7661 << Kind << Name << DC << SS.getRange();
7667 // If this is a named struct, check to see if there was a previous forward
7668 // declaration or definition.
7669 // FIXME: We're looking into outer scopes here, even when we
7670 // shouldn't be. Doing so can result in ambiguities that we
7671 // shouldn't be diagnosing.
7672 LookupName(Previous, S);
7674 if (Previous.isAmbiguous() &&
7675 (TUK == TUK_Definition || TUK == TUK_Declaration)) {
7676 LookupResult::Filter F = Previous.makeFilter();
7677 while (F.hasNext()) {
7678 NamedDecl *ND = F.next();
7679 if (ND->getDeclContext()->getRedeclContext() != SearchDC)
7685 // Note: there used to be some attempt at recovery here.
7686 if (Previous.isAmbiguous())
7689 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) {
7690 // FIXME: This makes sure that we ignore the contexts associated
7691 // with C structs, unions, and enums when looking for a matching
7692 // tag declaration or definition. See the similar lookup tweak
7693 // in Sema::LookupName; is there a better way to deal with this?
7694 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC))
7695 SearchDC = SearchDC->getParent();
7697 } else if (S->isFunctionPrototypeScope()) {
7698 // If this is an enum declaration in function prototype scope, set its
7699 // initial context to the translation unit.
7700 SearchDC = Context.getTranslationUnitDecl();
7703 if (Previous.isSingleResult() &&
7704 Previous.getFoundDecl()->isTemplateParameter()) {
7705 // Maybe we will complain about the shadowed template parameter.
7706 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl());
7707 // Just pretend that we didn't see the previous declaration.
7711 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace &&
7712 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) {
7713 // This is a declaration of or a reference to "std::bad_alloc".
7714 isStdBadAlloc = true;
7716 if (Previous.empty() && StdBadAlloc) {
7717 // std::bad_alloc has been implicitly declared (but made invisible to
7718 // name lookup). Fill in this implicit declaration as the previous
7719 // declaration, so that the declarations get chained appropriately.
7720 Previous.addDecl(getStdBadAlloc());
7724 // If we didn't find a previous declaration, and this is a reference
7725 // (or friend reference), move to the correct scope. In C++, we
7726 // also need to do a redeclaration lookup there, just in case
7727 // there's a shadow friend decl.
7728 if (Name && Previous.empty() &&
7729 (TUK == TUK_Reference || TUK == TUK_Friend)) {
7730 if (Invalid) goto CreateNewDecl;
7731 assert(SS.isEmpty());
7733 if (TUK == TUK_Reference) {
7734 // C++ [basic.scope.pdecl]p5:
7735 // -- for an elaborated-type-specifier of the form
7737 // class-key identifier
7739 // if the elaborated-type-specifier is used in the
7740 // decl-specifier-seq or parameter-declaration-clause of a
7741 // function defined in namespace scope, the identifier is
7742 // declared as a class-name in the namespace that contains
7743 // the declaration; otherwise, except as a friend
7744 // declaration, the identifier is declared in the smallest
7745 // non-class, non-function-prototype scope that contains the
7748 // C99 6.7.2.3p8 has a similar (but not identical!) provision for
7749 // C structs and unions.
7751 // It is an error in C++ to declare (rather than define) an enum
7752 // type, including via an elaborated type specifier. We'll
7753 // diagnose that later; for now, declare the enum in the same
7754 // scope as we would have picked for any other tag type.
7756 // GNU C also supports this behavior as part of its incomplete
7757 // enum types extension, while GNU C++ does not.
7759 // Find the context where we'll be declaring the tag.
7760 // FIXME: We would like to maintain the current DeclContext as the
7762 while (SearchDC->isRecord() || SearchDC->isTransparentContext())
7763 SearchDC = SearchDC->getParent();
7765 // Find the scope where we'll be declaring the tag.
7766 while (S->isClassScope() ||
7767 (getLangOptions().CPlusPlus &&
7768 S->isFunctionPrototypeScope()) ||
7769 ((S->getFlags() & Scope::DeclScope) == 0) ||
7771 ((DeclContext *)S->getEntity())->isTransparentContext()))
7774 assert(TUK == TUK_Friend);
7775 // C++ [namespace.memdef]p3:
7776 // If a friend declaration in a non-local class first declares a
7777 // class or function, the friend class or function is a member of
7778 // the innermost enclosing namespace.
7779 SearchDC = SearchDC->getEnclosingNamespaceContext();
7782 // In C++, we need to do a redeclaration lookup to properly
7783 // diagnose some problems.
7784 if (getLangOptions().CPlusPlus) {
7785 Previous.setRedeclarationKind(ForRedeclaration);
7786 LookupQualifiedName(Previous, SearchDC);
7790 if (!Previous.empty()) {
7791 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl();
7793 // It's okay to have a tag decl in the same scope as a typedef
7794 // which hides a tag decl in the same scope. Finding this
7795 // insanity with a redeclaration lookup can only actually happen
7798 // This is also okay for elaborated-type-specifiers, which is
7799 // technically forbidden by the current standard but which is
7800 // okay according to the likely resolution of an open issue;
7801 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407
7802 if (getLangOptions().CPlusPlus) {
7803 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) {
7804 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) {
7805 TagDecl *Tag = TT->getDecl();
7806 if (Tag->getDeclName() == Name &&
7807 Tag->getDeclContext()->getRedeclContext()
7808 ->Equals(TD->getDeclContext()->getRedeclContext())) {
7811 Previous.addDecl(Tag);
7812 Previous.resolveKind();
7818 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) {
7819 // If this is a use of a previous tag, or if the tag is already declared
7820 // in the same scope (so that the definition/declaration completes or
7821 // rementions the tag), reuse the decl.
7822 if (TUK == TUK_Reference || TUK == TUK_Friend ||
7823 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) {
7824 // Make sure that this wasn't declared as an enum and now used as a
7825 // struct or something similar.
7826 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind,
7827 TUK == TUK_Definition, KWLoc,
7830 = (PrevTagDecl->getTagKind() != TTK_Enum &&
7833 Diag(KWLoc, diag::err_use_with_wrong_tag)
7835 << FixItHint::CreateReplacement(SourceRange(KWLoc),
7836 PrevTagDecl->getKindName());
7838 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name;
7839 Diag(PrevTagDecl->getLocation(), diag::note_previous_use);
7842 Kind = PrevTagDecl->getTagKind();
7844 // Recover by making this an anonymous redefinition.
7851 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) {
7852 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl);
7854 // All conflicts with previous declarations are recovered by
7855 // returning the previous declaration.
7856 if (ScopedEnum != PrevEnum->isScoped()) {
7857 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch)
7858 << PrevEnum->isScoped();
7859 Diag(PrevTagDecl->getLocation(), diag::note_previous_use);
7862 else if (EnumUnderlying && PrevEnum->isFixed()) {
7864 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>())
7867 T = QualType(EnumUnderlying.get<const Type*>(), 0);
7869 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) {
7870 Diag(NameLoc.isValid() ? NameLoc : KWLoc,
7871 diag::err_enum_redeclare_type_mismatch)
7873 << PrevEnum->getIntegerType();
7874 Diag(PrevTagDecl->getLocation(), diag::note_previous_use);
7878 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) {
7879 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch)
7880 << PrevEnum->isFixed();
7881 Diag(PrevTagDecl->getLocation(), diag::note_previous_use);
7887 // If this is a use, just return the declaration we found.
7889 // FIXME: In the future, return a variant or some other clue
7890 // for the consumer of this Decl to know it doesn't own it.
7891 // For our current ASTs this shouldn't be a problem, but will
7892 // need to be changed with DeclGroups.
7893 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() ||
7894 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend)
7897 // Diagnose attempts to redefine a tag.
7898 if (TUK == TUK_Definition) {
7899 if (TagDecl *Def = PrevTagDecl->getDefinition()) {
7900 // If we're defining a specialization and the previous definition
7901 // is from an implicit instantiation, don't emit an error
7902 // here; we'll catch this in the general case below.
7903 if (!isExplicitSpecialization ||
7904 !isa<CXXRecordDecl>(Def) ||
7905 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind()
7906 == TSK_ExplicitSpecialization) {
7907 Diag(NameLoc, diag::err_redefinition) << Name;
7908 Diag(Def->getLocation(), diag::note_previous_definition);
7909 // If this is a redefinition, recover by making this
7910 // struct be anonymous, which will make any later
7911 // references get the previous definition.
7917 // If the type is currently being defined, complain
7918 // about a nested redefinition.
7920 = cast<TagType>(Context.getTagDeclType(PrevTagDecl));
7921 if (Tag->isBeingDefined()) {
7922 Diag(NameLoc, diag::err_nested_redefinition) << Name;
7923 Diag(PrevTagDecl->getLocation(),
7924 diag::note_previous_definition);
7931 // Okay, this is definition of a previously declared or referenced
7932 // tag PrevDecl. We're going to create a new Decl for it.
7935 // If we get here we have (another) forward declaration or we
7936 // have a definition. Just create a new decl.
7939 // If we get here, this is a definition of a new tag type in a nested
7940 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a
7941 // new decl/type. We set PrevDecl to NULL so that the entities
7942 // have distinct types.
7945 // If we get here, we're going to create a new Decl. If PrevDecl
7946 // is non-NULL, it's a definition of the tag declared by
7947 // PrevDecl. If it's NULL, we have a new definition.
7950 // Otherwise, PrevDecl is not a tag, but was found with tag
7951 // lookup. This is only actually possible in C++, where a few
7952 // things like templates still live in the tag namespace.
7954 assert(getLangOptions().CPlusPlus);
7956 // Use a better diagnostic if an elaborated-type-specifier
7957 // found the wrong kind of type on the first
7958 // (non-redeclaration) lookup.
7959 if ((TUK == TUK_Reference || TUK == TUK_Friend) &&
7960 !Previous.isForRedeclaration()) {
7962 if (isa<TypedefDecl>(PrevDecl)) Kind = 1;
7963 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2;
7964 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3;
7965 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind;
7966 Diag(PrevDecl->getLocation(), diag::note_declared_at);
7969 // Otherwise, only diagnose if the declaration is in scope.
7970 } else if (!isDeclInScope(PrevDecl, SearchDC, S,
7971 isExplicitSpecialization)) {
7974 // Diagnose implicit declarations introduced by elaborated types.
7975 } else if (TUK == TUK_Reference || TUK == TUK_Friend) {
7977 if (isa<TypedefDecl>(PrevDecl)) Kind = 1;
7978 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2;
7979 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3;
7980 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind;
7981 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl;
7984 // Otherwise it's a declaration. Call out a particularly common
7986 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) {
7988 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1;
7989 Diag(NameLoc, diag::err_tag_definition_of_typedef)
7990 << Name << Kind << TND->getUnderlyingType();
7991 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl;
7994 // Otherwise, diagnose.
7996 // The tag name clashes with something else in the target scope,
7997 // issue an error and recover by making this tag be anonymous.
7998 Diag(NameLoc, diag::err_redefinition_different_kind) << Name;
7999 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
8004 // The existing declaration isn't relevant to us; we're in a
8005 // new scope, so clear out the previous declaration.
8012 TagDecl *PrevDecl = 0;
8013 if (Previous.isSingleResult())
8014 PrevDecl = cast<TagDecl>(Previous.getFoundDecl());
8016 // If there is an identifier, use the location of the identifier as the
8017 // location of the decl, otherwise use the location of the struct/union
8019 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc;
8021 // Otherwise, create a new declaration. If there is a previous
8022 // declaration of the same entity, the two will be linked via
8026 bool IsForwardReference = false;
8027 if (Kind == TTK_Enum) {
8028 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
8029 // enum X { A, B, C } D; D should chain to X.
8030 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name,
8031 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum,
8032 ScopedEnumUsesClassTag, !EnumUnderlying.isNull());
8033 // If this is an undefined enum, warn.
8034 if (TUK != TUK_Definition && !Invalid) {
8036 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) {
8037 // C++0x: 7.2p2: opaque-enum-declaration.
8038 // Conflicts are diagnosed above. Do nothing.
8040 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) {
8041 Diag(Loc, diag::ext_forward_ref_enum_def)
8043 Diag(Def->getLocation(), diag::note_previous_definition);
8045 unsigned DiagID = diag::ext_forward_ref_enum;
8046 if (getLangOptions().MicrosoftExt)
8047 DiagID = diag::ext_ms_forward_ref_enum;
8048 else if (getLangOptions().CPlusPlus)
8049 DiagID = diag::err_forward_ref_enum;
8052 // If this is a forward-declared reference to an enumeration, make a
8053 // note of it; we won't actually be introducing the declaration into
8054 // the declaration context.
8055 if (TUK == TUK_Reference)
8056 IsForwardReference = true;
8060 if (EnumUnderlying) {
8061 EnumDecl *ED = cast<EnumDecl>(New);
8062 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>())
8063 ED->setIntegerTypeSourceInfo(TI);
8065 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0));
8066 ED->setPromotionType(ED->getIntegerType());
8070 // struct/union/class
8072 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
8073 // struct X { int A; } D; D should chain to X.
8074 if (getLangOptions().CPlusPlus) {
8075 // FIXME: Look for a way to use RecordDecl for simple structs.
8076 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name,
8077 cast_or_null<CXXRecordDecl>(PrevDecl));
8079 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit()))
8080 StdBadAlloc = cast<CXXRecordDecl>(New);
8082 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name,
8083 cast_or_null<RecordDecl>(PrevDecl));
8086 // Maybe add qualifier info.
8087 if (SS.isNotEmpty()) {
8089 New->setQualifierInfo(SS.getWithLocInContext(Context));
8090 if (TemplateParameterLists.size() > 0) {
8091 New->setTemplateParameterListsInfo(Context,
8092 TemplateParameterLists.size(),
8093 (TemplateParameterList**) TemplateParameterLists.release());
8100 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) {
8101 // Add alignment attributes if necessary; these attributes are checked when
8102 // the ASTContext lays out the structure.
8104 // It is important for implementing the correct semantics that this
8105 // happen here (in act on tag decl). The #pragma pack stack is
8106 // maintained as a result of parser callbacks which can occur at
8107 // many points during the parsing of a struct declaration (because
8108 // the #pragma tokens are effectively skipped over during the
8109 // parsing of the struct).
8110 AddAlignmentAttributesForRecord(RD);
8112 AddMsStructLayoutForRecord(RD);
8115 if (PrevDecl && PrevDecl->isModulePrivate())
8116 New->setModulePrivate();
8117 else if (ModulePrivateLoc.isValid()) {
8118 if (isExplicitSpecialization)
8119 Diag(New->getLocation(), diag::err_module_private_specialization)
8121 << FixItHint::CreateRemoval(ModulePrivateLoc);
8122 else if (PrevDecl && !PrevDecl->isModulePrivate())
8123 diagnoseModulePrivateRedeclaration(New, PrevDecl, ModulePrivateLoc);
8124 // __module_private__ does not apply to local classes. However, we only
8125 // diagnose this as an error when the declaration specifiers are
8126 // freestanding. Here, we just ignore the __module_private__.
8128 else if (!SearchDC->isFunctionOrMethod())
8129 New->setModulePrivate();
8132 // If this is a specialization of a member class (of a class template),
8133 // check the specialization.
8134 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous))
8138 New->setInvalidDecl();
8141 ProcessDeclAttributeList(S, New, Attr);
8143 // If we're declaring or defining a tag in function prototype scope
8144 // in C, note that this type can only be used within the function.
8145 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus)
8146 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New);
8148 // Set the lexical context. If the tag has a C++ scope specifier, the
8149 // lexical context will be different from the semantic context.
8150 New->setLexicalDeclContext(CurContext);
8152 // Mark this as a friend decl if applicable.
8153 // In Microsoft mode, a friend declaration also acts as a forward
8154 // declaration so we always pass true to setObjectOfFriendDecl to make
8155 // the tag name visible.
8156 if (TUK == TUK_Friend)
8157 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() ||
8158 getLangOptions().MicrosoftExt);
8160 // Set the access specifier.
8161 if (!Invalid && SearchDC->isRecord())
8162 SetMemberAccessSpecifier(New, PrevDecl, AS);
8164 if (TUK == TUK_Definition)
8165 New->startDefinition();
8167 // If this has an identifier, add it to the scope stack.
8168 if (TUK == TUK_Friend) {
8169 // We might be replacing an existing declaration in the lookup tables;
8170 // if so, borrow its access specifier.
8172 New->setAccess(PrevDecl->getAccess());
8174 DeclContext *DC = New->getDeclContext()->getRedeclContext();
8175 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false);
8176 if (Name) // can be null along some error paths
8177 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC))
8178 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false);
8180 S = getNonFieldDeclScope(S);
8181 PushOnScopeChains(New, S, !IsForwardReference);
8182 if (IsForwardReference)
8183 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false);
8186 CurContext->addDecl(New);
8189 // If this is the C FILE type, notify the AST context.
8190 if (IdentifierInfo *II = New->getIdentifier())
8191 if (!New->isInvalidDecl() &&
8192 New->getDeclContext()->getRedeclContext()->isTranslationUnit() &&
8194 Context.setFILEDecl(New);
8200 void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) {
8201 AdjustDeclIfTemplate(TagD);
8202 TagDecl *Tag = cast<TagDecl>(TagD);
8204 // Enter the tag context.
8205 PushDeclContext(S, Tag);
8208 Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) {
8209 assert(isa<ObjCContainerDecl>(IDecl) &&
8210 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl");
8211 DeclContext *OCD = cast<DeclContext>(IDecl);
8212 assert(getContainingDC(OCD) == CurContext &&
8213 "The next DeclContext should be lexically contained in the current one.");
8218 void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD,
8219 SourceLocation FinalLoc,
8220 SourceLocation LBraceLoc) {
8221 AdjustDeclIfTemplate(TagD);
8222 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD);
8224 FieldCollector->StartClass();
8226 if (!Record->getIdentifier())
8229 if (FinalLoc.isValid())
8230 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context));
8233 // [...] The class-name is also inserted into the scope of the
8234 // class itself; this is known as the injected-class-name. For
8235 // purposes of access checking, the injected-class-name is treated
8236 // as if it were a public member name.
8237 CXXRecordDecl *InjectedClassName
8238 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext,
8239 Record->getLocStart(), Record->getLocation(),
8240 Record->getIdentifier(),
8242 /*DelayTypeCreation=*/true);
8243 Context.getTypeDeclType(InjectedClassName, Record);
8244 InjectedClassName->setImplicit();
8245 InjectedClassName->setAccess(AS_public);
8246 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate())
8247 InjectedClassName->setDescribedClassTemplate(Template);
8248 PushOnScopeChains(InjectedClassName, S);
8249 assert(InjectedClassName->isInjectedClassName() &&
8250 "Broken injected-class-name");
8253 void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD,
8254 SourceLocation RBraceLoc) {
8255 AdjustDeclIfTemplate(TagD);
8256 TagDecl *Tag = cast<TagDecl>(TagD);
8257 Tag->setRBraceLoc(RBraceLoc);
8259 if (isa<CXXRecordDecl>(Tag))
8260 FieldCollector->FinishClass();
8262 // Exit this scope of this tag's definition.
8265 // Notify the consumer that we've defined a tag.
8266 Consumer.HandleTagDeclDefinition(Tag);
8269 void Sema::ActOnObjCContainerFinishDefinition() {
8270 // Exit this scope of this interface definition.
8274 void Sema::ActOnObjCTemporaryExitContainerContext() {
8275 OriginalLexicalContext = CurContext;
8276 ActOnObjCContainerFinishDefinition();
8279 void Sema::ActOnObjCReenterContainerContext() {
8280 ActOnObjCContainerStartDefinition(cast<Decl>(OriginalLexicalContext));
8281 OriginalLexicalContext = 0;
8284 void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) {
8285 AdjustDeclIfTemplate(TagD);
8286 TagDecl *Tag = cast<TagDecl>(TagD);
8287 Tag->setInvalidDecl();
8289 // We're undoing ActOnTagStartDefinition here, not
8290 // ActOnStartCXXMemberDeclarations, so we don't have to mess with
8291 // the FieldCollector.
8296 // Note that FieldName may be null for anonymous bitfields.
8297 bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName,
8298 QualType FieldTy, const Expr *BitWidth,
8300 // Default to true; that shouldn't confuse checks for emptiness
8304 // C99 6.7.2.1p4 - verify the field type.
8305 // C++ 9.6p3: A bit-field shall have integral or enumeration type.
8306 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) {
8307 // Handle incomplete types with specific error.
8308 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete))
8311 return Diag(FieldLoc, diag::err_not_integral_type_bitfield)
8312 << FieldName << FieldTy << BitWidth->getSourceRange();
8313 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield)
8314 << FieldTy << BitWidth->getSourceRange();
8315 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth),
8316 UPPC_BitFieldWidth))
8319 // If the bit-width is type- or value-dependent, don't try to check
8321 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent())
8325 if (VerifyIntegerConstantExpression(BitWidth, &Value))
8328 if (Value != 0 && ZeroWidth)
8331 // Zero-width bitfield is ok for anonymous field.
8332 if (Value == 0 && FieldName)
8333 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName;
8335 if (Value.isSigned() && Value.isNegative()) {
8337 return Diag(FieldLoc, diag::err_bitfield_has_negative_width)
8338 << FieldName << Value.toString(10);
8339 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width)
8340 << Value.toString(10);
8343 if (!FieldTy->isDependentType()) {
8344 uint64_t TypeSize = Context.getTypeSize(FieldTy);
8345 if (Value.getZExtValue() > TypeSize) {
8346 if (!getLangOptions().CPlusPlus) {
8348 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size)
8349 << FieldName << (unsigned)Value.getZExtValue()
8350 << (unsigned)TypeSize;
8352 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size)
8353 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize;
8357 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size)
8358 << FieldName << (unsigned)Value.getZExtValue()
8359 << (unsigned)TypeSize;
8361 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size)
8362 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize;
8369 /// ActOnField - Each field of a C struct/union is passed into this in order
8370 /// to create a FieldDecl object for it.
8371 Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart,
8372 Declarator &D, Expr *BitfieldWidth) {
8373 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD),
8374 DeclStart, D, static_cast<Expr*>(BitfieldWidth),
8375 /*HasInit=*/false, AS_public);
8379 /// HandleField - Analyze a field of a C struct or a C++ data member.
8381 FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record,
8382 SourceLocation DeclStart,
8383 Declarator &D, Expr *BitWidth, bool HasInit,
8384 AccessSpecifier AS) {
8385 IdentifierInfo *II = D.getIdentifier();
8386 SourceLocation Loc = DeclStart;
8387 if (II) Loc = D.getIdentifierLoc();
8389 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
8390 QualType T = TInfo->getType();
8391 if (getLangOptions().CPlusPlus) {
8392 CheckExtraCXXDefaultArguments(D);
8394 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo,
8395 UPPC_DataMemberType)) {
8398 TInfo = Context.getTrivialTypeSourceInfo(T, Loc);
8402 DiagnoseFunctionSpecifiers(D);
8404 if (D.getDeclSpec().isThreadSpecified())
8405 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
8406 if (D.getDeclSpec().isConstexprSpecified())
8407 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr)
8410 // Check to see if this name was declared as a member previously
8411 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration);
8412 LookupName(Previous, S);
8413 assert((Previous.empty() || Previous.isOverloadedResult() ||
8414 Previous.isSingleResult())
8415 && "Lookup of member name should be either overloaded, single or null");
8417 // If the name is overloaded then get any declaration else get the single result
8418 NamedDecl *PrevDecl = Previous.isOverloadedResult() ?
8419 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>();
8421 if (PrevDecl && PrevDecl->isTemplateParameter()) {
8422 // Maybe we will complain about the shadowed template parameter.
8423 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl);
8424 // Just pretend that we didn't see the previous declaration.
8428 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S))
8432 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable);
8433 SourceLocation TSSL = D.getSourceRange().getBegin();
8435 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit,
8436 TSSL, AS, PrevDecl, &D);
8438 if (NewFD->isInvalidDecl())
8439 Record->setInvalidDecl();
8441 if (D.getDeclSpec().isModulePrivateSpecified())
8442 NewFD->setModulePrivate();
8444 if (NewFD->isInvalidDecl() && PrevDecl) {
8445 // Don't introduce NewFD into scope; there's already something
8446 // with the same name in the same scope.
8448 PushOnScopeChains(NewFD, S);
8450 Record->addDecl(NewFD);
8455 /// \brief Build a new FieldDecl and check its well-formedness.
8457 /// This routine builds a new FieldDecl given the fields name, type,
8458 /// record, etc. \p PrevDecl should refer to any previous declaration
8459 /// with the same name and in the same scope as the field to be
8462 /// \returns a new FieldDecl.
8464 /// \todo The Declarator argument is a hack. It will be removed once
8465 FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T,
8466 TypeSourceInfo *TInfo,
8467 RecordDecl *Record, SourceLocation Loc,
8468 bool Mutable, Expr *BitWidth, bool HasInit,
8469 SourceLocation TSSL,
8470 AccessSpecifier AS, NamedDecl *PrevDecl,
8472 IdentifierInfo *II = Name.getAsIdentifierInfo();
8473 bool InvalidDecl = false;
8474 if (D) InvalidDecl = D->isInvalidType();
8476 // If we receive a broken type, recover by assuming 'int' and
8477 // marking this declaration as invalid.
8483 QualType EltTy = Context.getBaseElementType(T);
8484 if (!EltTy->isDependentType() &&
8485 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) {
8486 // Fields of incomplete type force their record to be invalid.
8487 Record->setInvalidDecl();
8491 // C99 6.7.2.1p8: A member of a structure or union may have any type other
8492 // than a variably modified type.
8493 if (!InvalidDecl && T->isVariablyModifiedType()) {
8494 bool SizeIsNegative;
8495 llvm::APSInt Oversized;
8496 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context,
8499 if (!FixedTy.isNull()) {
8500 Diag(Loc, diag::warn_illegal_constant_array_size);
8504 Diag(Loc, diag::err_typecheck_negative_array_size);
8505 else if (Oversized.getBoolValue())
8506 Diag(Loc, diag::err_array_too_large)
8507 << Oversized.toString(10);
8509 Diag(Loc, diag::err_typecheck_field_variable_size);
8514 // Fields can not have abstract class types
8515 if (!InvalidDecl && RequireNonAbstractType(Loc, T,
8516 diag::err_abstract_type_in_decl,
8520 bool ZeroWidth = false;
8521 // If this is declared as a bit-field, check the bit-field.
8522 if (!InvalidDecl && BitWidth &&
8523 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) {
8529 // Check that 'mutable' is consistent with the type of the declaration.
8530 if (!InvalidDecl && Mutable) {
8531 unsigned DiagID = 0;
8532 if (T->isReferenceType())
8533 DiagID = diag::err_mutable_reference;
8534 else if (T.isConstQualified())
8535 DiagID = diag::err_mutable_const;
8538 SourceLocation ErrLoc = Loc;
8539 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid())
8540 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc();
8541 Diag(ErrLoc, DiagID);
8547 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo,
8548 BitWidth, Mutable, HasInit);
8550 NewFD->setInvalidDecl();
8552 if (PrevDecl && !isa<TagDecl>(PrevDecl)) {
8553 Diag(Loc, diag::err_duplicate_member) << II;
8554 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
8555 NewFD->setInvalidDecl();
8558 if (!InvalidDecl && getLangOptions().CPlusPlus) {
8559 if (Record->isUnion()) {
8560 if (const RecordType *RT = EltTy->getAs<RecordType>()) {
8561 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl());
8562 if (RDecl->getDefinition()) {
8563 // C++ [class.union]p1: An object of a class with a non-trivial
8564 // constructor, a non-trivial copy constructor, a non-trivial
8565 // destructor, or a non-trivial copy assignment operator
8566 // cannot be a member of a union, nor can an array of such
8568 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(NewFD))
8569 NewFD->setInvalidDecl();
8573 // C++ [class.union]p1: If a union contains a member of reference type,
8574 // the program is ill-formed.
8575 if (EltTy->isReferenceType()) {
8576 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type)
8577 << NewFD->getDeclName() << EltTy;
8578 NewFD->setInvalidDecl();
8583 // FIXME: We need to pass in the attributes given an AST
8584 // representation, not a parser representation.
8586 // FIXME: What to pass instead of TUScope?
8587 ProcessDeclAttributes(TUScope, NewFD, *D);
8589 // In auto-retain/release, infer strong retension for fields of
8591 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD))
8592 NewFD->setInvalidDecl();
8594 if (T.isObjCGCWeak())
8595 Diag(Loc, diag::warn_attribute_weak_on_field);
8597 NewFD->setAccess(AS);
8601 bool Sema::CheckNontrivialField(FieldDecl *FD) {
8603 assert(getLangOptions().CPlusPlus && "valid check only for C++");
8605 if (FD->isInvalidDecl())
8608 QualType EltTy = Context.getBaseElementType(FD->getType());
8609 if (const RecordType *RT = EltTy->getAs<RecordType>()) {
8610 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl());
8611 if (RDecl->getDefinition()) {
8612 // We check for copy constructors before constructors
8613 // because otherwise we'll never get complaints about
8614 // copy constructors.
8616 CXXSpecialMember member = CXXInvalid;
8617 if (!RDecl->hasTrivialCopyConstructor())
8618 member = CXXCopyConstructor;
8619 else if (!RDecl->hasTrivialDefaultConstructor())
8620 member = CXXDefaultConstructor;
8621 else if (!RDecl->hasTrivialCopyAssignment())
8622 member = CXXCopyAssignment;
8623 else if (!RDecl->hasTrivialDestructor())
8624 member = CXXDestructor;
8626 if (member != CXXInvalid) {
8627 if (getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) {
8628 // Objective-C++ ARC: it is an error to have a non-trivial field of
8629 // a union. However, system headers in Objective-C programs
8630 // occasionally have Objective-C lifetime objects within unions,
8631 // and rather than cause the program to fail, we make those
8632 // members unavailable.
8633 SourceLocation Loc = FD->getLocation();
8634 if (getSourceManager().isInSystemHeader(Loc)) {
8635 if (!FD->hasAttr<UnavailableAttr>())
8636 FD->addAttr(new (Context) UnavailableAttr(Loc, Context,
8637 "this system field has retaining ownership"));
8642 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member)
8643 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member;
8644 DiagnoseNontrivial(RT, member);
8653 /// DiagnoseNontrivial - Given that a class has a non-trivial
8654 /// special member, figure out why.
8655 void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) {
8657 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl());
8659 // Check whether the member was user-declared.
8664 case CXXDefaultConstructor:
8665 if (RD->hasUserDeclaredConstructor()) {
8666 typedef CXXRecordDecl::ctor_iterator ctor_iter;
8667 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){
8668 const FunctionDecl *body = 0;
8670 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) {
8671 SourceLocation CtorLoc = ci->getLocation();
8672 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member;
8677 llvm_unreachable("found no user-declared constructors");
8681 case CXXCopyConstructor:
8682 if (RD->hasUserDeclaredCopyConstructor()) {
8683 SourceLocation CtorLoc =
8684 RD->getCopyConstructor(0)->getLocation();
8685 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member;
8690 case CXXMoveConstructor:
8691 if (RD->hasUserDeclaredMoveConstructor()) {
8692 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation();
8693 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member;
8698 case CXXCopyAssignment:
8699 if (RD->hasUserDeclaredCopyAssignment()) {
8700 // FIXME: this should use the location of the copy
8701 // assignment, not the type.
8702 SourceLocation TyLoc = RD->getSourceRange().getBegin();
8703 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member;
8708 case CXXMoveAssignment:
8709 if (RD->hasUserDeclaredMoveAssignment()) {
8710 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation();
8711 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member;
8717 if (RD->hasUserDeclaredDestructor()) {
8718 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation();
8719 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member;
8725 typedef CXXRecordDecl::base_class_iterator base_iter;
8727 // Virtual bases and members inhibit trivial copying/construction,
8728 // but not trivial destruction.
8729 if (member != CXXDestructor) {
8730 // Check for virtual bases. vbases includes indirect virtual bases,
8731 // so we just iterate through the direct bases.
8732 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi)
8733 if (bi->isVirtual()) {
8734 SourceLocation BaseLoc = bi->getSourceRange().getBegin();
8735 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1;
8739 // Check for virtual methods.
8740 typedef CXXRecordDecl::method_iterator meth_iter;
8741 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me;
8743 if (mi->isVirtual()) {
8744 SourceLocation MLoc = mi->getSourceRange().getBegin();
8745 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0;
8751 bool (CXXRecordDecl::*hasTrivial)() const;
8753 case CXXDefaultConstructor:
8754 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break;
8755 case CXXCopyConstructor:
8756 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break;
8757 case CXXCopyAssignment:
8758 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break;
8760 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break;
8762 llvm_unreachable("unexpected special member");
8765 // Check for nontrivial bases (and recurse).
8766 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) {
8767 const RecordType *BaseRT = bi->getType()->getAs<RecordType>();
8768 assert(BaseRT && "Don't know how to handle dependent bases");
8769 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl());
8770 if (!(BaseRecTy->*hasTrivial)()) {
8771 SourceLocation BaseLoc = bi->getSourceRange().getBegin();
8772 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member;
8773 DiagnoseNontrivial(BaseRT, member);
8778 // Check for nontrivial members (and recurse).
8779 typedef RecordDecl::field_iterator field_iter;
8780 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe;
8782 QualType EltTy = Context.getBaseElementType((*fi)->getType());
8783 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) {
8784 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl());
8786 if (!(EltRD->*hasTrivial)()) {
8787 SourceLocation FLoc = (*fi)->getLocation();
8788 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member;
8789 DiagnoseNontrivial(EltRT, member);
8794 if (EltTy->isObjCLifetimeType()) {
8795 switch (EltTy.getObjCLifetime()) {
8796 case Qualifiers::OCL_None:
8797 case Qualifiers::OCL_ExplicitNone:
8800 case Qualifiers::OCL_Autoreleasing:
8801 case Qualifiers::OCL_Weak:
8802 case Qualifiers::OCL_Strong:
8803 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership)
8804 << QT << EltTy.getObjCLifetime();
8810 llvm_unreachable("found no explanation for non-trivial member");
8813 /// TranslateIvarVisibility - Translate visibility from a token ID to an
8815 static ObjCIvarDecl::AccessControl
8816 TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) {
8817 switch (ivarVisibility) {
8818 default: llvm_unreachable("Unknown visitibility kind");
8819 case tok::objc_private: return ObjCIvarDecl::Private;
8820 case tok::objc_public: return ObjCIvarDecl::Public;
8821 case tok::objc_protected: return ObjCIvarDecl::Protected;
8822 case tok::objc_package: return ObjCIvarDecl::Package;
8826 /// ActOnIvar - Each ivar field of an objective-c class is passed into this
8827 /// in order to create an IvarDecl object for it.
8828 Decl *Sema::ActOnIvar(Scope *S,
8829 SourceLocation DeclStart,
8830 Declarator &D, Expr *BitfieldWidth,
8831 tok::ObjCKeywordKind Visibility) {
8833 IdentifierInfo *II = D.getIdentifier();
8834 Expr *BitWidth = (Expr*)BitfieldWidth;
8835 SourceLocation Loc = DeclStart;
8836 if (II) Loc = D.getIdentifierLoc();
8838 // FIXME: Unnamed fields can be handled in various different ways, for
8839 // example, unnamed unions inject all members into the struct namespace!
8841 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
8842 QualType T = TInfo->getType();
8845 // 6.7.2.1p3, 6.7.2.1p4
8846 if (VerifyBitField(Loc, II, T, BitWidth)) {
8856 if (T->isReferenceType()) {
8857 Diag(Loc, diag::err_ivar_reference_type);
8860 // C99 6.7.2.1p8: A member of a structure or union may have any type other
8861 // than a variably modified type.
8862 else if (T->isVariablyModifiedType()) {
8863 Diag(Loc, diag::err_typecheck_ivar_variable_size);
8867 // Get the visibility (access control) for this ivar.
8868 ObjCIvarDecl::AccessControl ac =
8869 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility)
8870 : ObjCIvarDecl::None;
8871 // Must set ivar's DeclContext to its enclosing interface.
8872 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext);
8873 ObjCContainerDecl *EnclosingContext;
8874 if (ObjCImplementationDecl *IMPDecl =
8875 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
8876 if (!LangOpts.ObjCNonFragileABI2) {
8877 // Case of ivar declared in an implementation. Context is that of its class.
8878 EnclosingContext = IMPDecl->getClassInterface();
8879 assert(EnclosingContext && "Implementation has no class interface!");
8882 EnclosingContext = EnclosingDecl;
8884 if (ObjCCategoryDecl *CDecl =
8885 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
8886 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) {
8887 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension();
8891 EnclosingContext = EnclosingDecl;
8894 // Construct the decl.
8895 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext,
8896 DeclStart, Loc, II, T,
8897 TInfo, ac, (Expr *)BitfieldWidth);
8900 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName,
8902 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S)
8903 && !isa<TagDecl>(PrevDecl)) {
8904 Diag(Loc, diag::err_duplicate_member) << II;
8905 Diag(PrevDecl->getLocation(), diag::note_previous_declaration);
8906 NewID->setInvalidDecl();
8910 // Process attributes attached to the ivar.
8911 ProcessDeclAttributes(S, NewID, D);
8913 if (D.isInvalidType())
8914 NewID->setInvalidDecl();
8916 // In ARC, infer 'retaining' for ivars of retainable type.
8917 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID))
8918 NewID->setInvalidDecl();
8920 if (D.getDeclSpec().isModulePrivateSpecified())
8921 NewID->setModulePrivate();
8924 // FIXME: When interfaces are DeclContexts, we'll need to add
8925 // these to the interface.
8927 IdResolver.AddDecl(NewID);
8933 /// ActOnLastBitfield - This routine handles synthesized bitfields rules for
8934 /// class and class extensions. For every class @interface and class
8935 /// extension @interface, if the last ivar is a bitfield of any type,
8936 /// then add an implicit `char :0` ivar to the end of that interface.
8937 void Sema::ActOnLastBitfield(SourceLocation DeclLoc,
8938 SmallVectorImpl<Decl *> &AllIvarDecls) {
8939 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty())
8942 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1];
8943 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl);
8945 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0)
8947 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext);
8949 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) {
8950 if (!CD->IsClassExtension())
8953 // No need to add this to end of @implementation.
8957 // All conditions are met. Add a new bitfield to the tail end of ivars.
8958 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0);
8959 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc);
8961 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext),
8962 DeclLoc, DeclLoc, 0,
8964 Context.getTrivialTypeSourceInfo(Context.CharTy,
8966 ObjCIvarDecl::Private, BW,
8968 AllIvarDecls.push_back(Ivar);
8971 void Sema::ActOnFields(Scope* S,
8972 SourceLocation RecLoc, Decl *EnclosingDecl,
8973 llvm::ArrayRef<Decl *> Fields,
8974 SourceLocation LBrac, SourceLocation RBrac,
8975 AttributeList *Attr) {
8976 assert(EnclosingDecl && "missing record or interface decl");
8978 // If the decl this is being inserted into is invalid, then it may be a
8979 // redeclaration or some other bogus case. Don't try to add fields to it.
8980 if (EnclosingDecl->isInvalidDecl())
8983 // Verify that all the fields are okay.
8984 unsigned NumNamedMembers = 0;
8985 SmallVector<FieldDecl*, 32> RecFields;
8987 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl);
8988 bool ARCErrReported = false;
8989 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end();
8991 FieldDecl *FD = cast<FieldDecl>(*i);
8993 // Get the type for the field.
8994 const Type *FDTy = FD->getType().getTypePtr();
8996 if (!FD->isAnonymousStructOrUnion()) {
8997 // Remember all fields written by the user.
8998 RecFields.push_back(FD);
9001 // If the field is already invalid for some reason, don't emit more
9002 // diagnostics about it.
9003 if (FD->isInvalidDecl()) {
9004 EnclosingDecl->setInvalidDecl();
9009 // A structure or union shall not contain a member with
9010 // incomplete or function type (hence, a structure shall not
9011 // contain an instance of itself, but may contain a pointer to
9012 // an instance of itself), except that the last member of a
9013 // structure with more than one named member may have incomplete
9014 // array type; such a structure (and any union containing,
9015 // possibly recursively, a member that is such a structure)
9016 // shall not be a member of a structure or an element of an
9018 if (FDTy->isFunctionType()) {
9019 // Field declared as a function.
9020 Diag(FD->getLocation(), diag::err_field_declared_as_function)
9021 << FD->getDeclName();
9022 FD->setInvalidDecl();
9023 EnclosingDecl->setInvalidDecl();
9025 } else if (FDTy->isIncompleteArrayType() && Record &&
9026 ((i + 1 == Fields.end() && !Record->isUnion()) ||
9027 ((getLangOptions().MicrosoftExt ||
9028 getLangOptions().CPlusPlus) &&
9029 (i + 1 == Fields.end() || Record->isUnion())))) {
9030 // Flexible array member.
9031 // Microsoft and g++ is more permissive regarding flexible array.
9032 // It will accept flexible array in union and also
9033 // as the sole element of a struct/class.
9034 if (getLangOptions().MicrosoftExt) {
9035 if (Record->isUnion())
9036 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms)
9037 << FD->getDeclName();
9038 else if (Fields.size() == 1)
9039 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms)
9040 << FD->getDeclName() << Record->getTagKind();
9041 } else if (getLangOptions().CPlusPlus) {
9042 if (Record->isUnion())
9043 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu)
9044 << FD->getDeclName();
9045 else if (Fields.size() == 1)
9046 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu)
9047 << FD->getDeclName() << Record->getTagKind();
9048 } else if (NumNamedMembers < 1) {
9049 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct)
9050 << FD->getDeclName();
9051 FD->setInvalidDecl();
9052 EnclosingDecl->setInvalidDecl();
9055 if (!FD->getType()->isDependentType() &&
9056 !Context.getBaseElementType(FD->getType()).isPODType(Context)) {
9057 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type)
9058 << FD->getDeclName() << FD->getType();
9059 FD->setInvalidDecl();
9060 EnclosingDecl->setInvalidDecl();
9063 // Okay, we have a legal flexible array member at the end of the struct.
9065 Record->setHasFlexibleArrayMember(true);
9066 } else if (!FDTy->isDependentType() &&
9067 RequireCompleteType(FD->getLocation(), FD->getType(),
9068 diag::err_field_incomplete)) {
9070 FD->setInvalidDecl();
9071 EnclosingDecl->setInvalidDecl();
9073 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) {
9074 if (FDTTy->getDecl()->hasFlexibleArrayMember()) {
9075 // If this is a member of a union, then entire union becomes "flexible".
9076 if (Record && Record->isUnion()) {
9077 Record->setHasFlexibleArrayMember(true);
9079 // If this is a struct/class and this is not the last element, reject
9080 // it. Note that GCC supports variable sized arrays in the middle of
9082 if (i + 1 != Fields.end())
9083 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct)
9084 << FD->getDeclName() << FD->getType();
9086 // We support flexible arrays at the end of structs in
9087 // other structs as an extension.
9088 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct)
9089 << FD->getDeclName();
9091 Record->setHasFlexibleArrayMember(true);
9095 if (Record && FDTTy->getDecl()->hasObjectMember())
9096 Record->setHasObjectMember(true);
9097 } else if (FDTy->isObjCObjectType()) {
9098 /// A field cannot be an Objective-c object
9099 Diag(FD->getLocation(), diag::err_statically_allocated_object)
9100 << FixItHint::CreateInsertion(FD->getLocation(), "*");
9101 QualType T = Context.getObjCObjectPointerType(FD->getType());
9104 else if (!getLangOptions().CPlusPlus) {
9105 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) {
9106 // It's an error in ARC if a field has lifetime.
9107 // We don't want to report this in a system header, though,
9108 // so we just make the field unavailable.
9109 // FIXME: that's really not sufficient; we need to make the type
9110 // itself invalid to, say, initialize or copy.
9111 QualType T = FD->getType();
9112 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime();
9113 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) {
9114 SourceLocation loc = FD->getLocation();
9115 if (getSourceManager().isInSystemHeader(loc)) {
9116 if (!FD->hasAttr<UnavailableAttr>()) {
9117 FD->addAttr(new (Context) UnavailableAttr(loc, Context,
9118 "this system field has retaining ownership"));
9121 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct);
9123 ARCErrReported = true;
9126 else if (getLangOptions().ObjC1 &&
9127 getLangOptions().getGC() != LangOptions::NonGC &&
9128 Record && !Record->hasObjectMember()) {
9129 if (FD->getType()->isObjCObjectPointerType() ||
9130 FD->getType().isObjCGCStrong())
9131 Record->setHasObjectMember(true);
9132 else if (Context.getAsArrayType(FD->getType())) {
9133 QualType BaseType = Context.getBaseElementType(FD->getType());
9134 if (BaseType->isRecordType() &&
9135 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember())
9136 Record->setHasObjectMember(true);
9137 else if (BaseType->isObjCObjectPointerType() ||
9138 BaseType.isObjCGCStrong())
9139 Record->setHasObjectMember(true);
9143 // Keep track of the number of named members.
9144 if (FD->getIdentifier())
9148 // Okay, we successfully defined 'Record'.
9150 bool Completed = false;
9151 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) {
9152 if (!CXXRecord->isInvalidDecl()) {
9153 // Set access bits correctly on the directly-declared conversions.
9154 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions();
9155 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end();
9157 Convs->setAccess(I, (*I)->getAccess());
9159 if (!CXXRecord->isDependentType()) {
9160 // Objective-C Automatic Reference Counting:
9161 // If a class has a non-static data member of Objective-C pointer
9162 // type (or array thereof), it is a non-POD type and its
9163 // default constructor (if any), copy constructor, copy assignment
9164 // operator, and destructor are non-trivial.
9166 // This rule is also handled by CXXRecordDecl::completeDefinition().
9167 // However, here we check whether this particular class is only
9168 // non-POD because of the presence of an Objective-C pointer member.
9169 // If so, objects of this type cannot be shared between code compiled
9170 // with instant objects and code compiled with manual retain/release.
9171 if (getLangOptions().ObjCAutoRefCount &&
9172 CXXRecord->hasObjectMember() &&
9173 CXXRecord->getLinkage() == ExternalLinkage) {
9174 if (CXXRecord->isPOD()) {
9175 Diag(CXXRecord->getLocation(),
9176 diag::warn_arc_non_pod_class_with_object_member)
9179 // FIXME: Fix-Its would be nice here, but finding a good location
9180 // for them is going to be tricky.
9181 if (CXXRecord->hasTrivialCopyConstructor())
9182 Diag(CXXRecord->getLocation(),
9183 diag::warn_arc_trivial_member_function_with_object_member)
9185 if (CXXRecord->hasTrivialCopyAssignment())
9186 Diag(CXXRecord->getLocation(),
9187 diag::warn_arc_trivial_member_function_with_object_member)
9189 if (CXXRecord->hasTrivialDestructor())
9190 Diag(CXXRecord->getLocation(),
9191 diag::warn_arc_trivial_member_function_with_object_member)
9196 // Adjust user-defined destructor exception spec.
9197 if (getLangOptions().CPlusPlus0x &&
9198 CXXRecord->hasUserDeclaredDestructor())
9199 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor());
9201 // Add any implicitly-declared members to this class.
9202 AddImplicitlyDeclaredMembersToClass(CXXRecord);
9204 // If we have virtual base classes, we may end up finding multiple
9205 // final overriders for a given virtual function. Check for this
9207 if (CXXRecord->getNumVBases()) {
9208 CXXFinalOverriderMap FinalOverriders;
9209 CXXRecord->getFinalOverriders(FinalOverriders);
9211 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(),
9212 MEnd = FinalOverriders.end();
9214 for (OverridingMethods::iterator SO = M->second.begin(),
9215 SOEnd = M->second.end();
9216 SO != SOEnd; ++SO) {
9217 assert(SO->second.size() > 0 &&
9218 "Virtual function without overridding functions?");
9219 if (SO->second.size() == 1)
9222 // C++ [class.virtual]p2:
9223 // In a derived class, if a virtual member function of a base
9224 // class subobject has more than one final overrider the
9225 // program is ill-formed.
9226 Diag(Record->getLocation(), diag::err_multiple_final_overriders)
9227 << (NamedDecl *)M->first << Record;
9228 Diag(M->first->getLocation(),
9229 diag::note_overridden_virtual_function);
9230 for (OverridingMethods::overriding_iterator
9231 OM = SO->second.begin(),
9232 OMEnd = SO->second.end();
9234 Diag(OM->Method->getLocation(), diag::note_final_overrider)
9235 << (NamedDecl *)M->first << OM->Method->getParent();
9237 Record->setInvalidDecl();
9240 CXXRecord->completeDefinition(&FinalOverriders);
9248 Record->completeDefinition();
9250 // Now that the record is complete, do any delayed exception spec checks
9252 while (!DelayedDestructorExceptionSpecChecks.empty()) {
9253 const CXXDestructorDecl *Dtor =
9254 DelayedDestructorExceptionSpecChecks.back().first;
9255 if (Dtor->getParent() != Record)
9258 assert(!Dtor->getParent()->isDependentType() &&
9259 "Should not ever add destructors of templates into the list.");
9260 CheckOverridingFunctionExceptionSpec(Dtor,
9261 DelayedDestructorExceptionSpecChecks.back().second);
9262 DelayedDestructorExceptionSpecChecks.pop_back();
9266 ObjCIvarDecl **ClsFields =
9267 reinterpret_cast<ObjCIvarDecl**>(RecFields.data());
9268 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) {
9269 ID->setLocEnd(RBrac);
9270 // Add ivar's to class's DeclContext.
9271 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
9272 ClsFields[i]->setLexicalDeclContext(ID);
9273 ID->addDecl(ClsFields[i]);
9275 // Must enforce the rule that ivars in the base classes may not be
9277 if (ID->getSuperClass())
9278 DiagnoseDuplicateIvars(ID, ID->getSuperClass());
9279 } else if (ObjCImplementationDecl *IMPDecl =
9280 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) {
9281 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl");
9282 for (unsigned I = 0, N = RecFields.size(); I != N; ++I)
9283 // Ivar declared in @implementation never belongs to the implementation.
9284 // Only it is in implementation's lexical context.
9285 ClsFields[I]->setLexicalDeclContext(IMPDecl);
9286 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac);
9287 } else if (ObjCCategoryDecl *CDecl =
9288 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) {
9289 // case of ivars in class extension; all other cases have been
9290 // reported as errors elsewhere.
9291 // FIXME. Class extension does not have a LocEnd field.
9292 // CDecl->setLocEnd(RBrac);
9293 // Add ivar's to class extension's DeclContext.
9294 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) {
9295 ClsFields[i]->setLexicalDeclContext(CDecl);
9296 CDecl->addDecl(ClsFields[i]);
9302 ProcessDeclAttributeList(S, Record, Attr);
9304 // If there's a #pragma GCC visibility in scope, and this isn't a subclass,
9305 // set the visibility of this record.
9306 if (Record && !Record->getDeclContext()->isRecord())
9307 AddPushedVisibilityAttribute(Record);
9310 /// \brief Determine whether the given integral value is representable within
9311 /// the given type T.
9312 static bool isRepresentableIntegerValue(ASTContext &Context,
9313 llvm::APSInt &Value,
9315 assert(T->isIntegralType(Context) && "Integral type required!");
9316 unsigned BitWidth = Context.getIntWidth(T);
9318 if (Value.isUnsigned() || Value.isNonNegative()) {
9319 if (T->isSignedIntegerOrEnumerationType())
9321 return Value.getActiveBits() <= BitWidth;
9323 return Value.getMinSignedBits() <= BitWidth;
9326 // \brief Given an integral type, return the next larger integral type
9327 // (or a NULL type of no such type exists).
9328 static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) {
9329 // FIXME: Int128/UInt128 support, which also needs to be introduced into
9330 // enum checking below.
9331 assert(T->isIntegralType(Context) && "Integral type required!");
9332 const unsigned NumTypes = 4;
9333 QualType SignedIntegralTypes[NumTypes] = {
9334 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy
9336 QualType UnsignedIntegralTypes[NumTypes] = {
9337 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy,
9338 Context.UnsignedLongLongTy
9341 unsigned BitWidth = Context.getTypeSize(T);
9342 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes
9343 : UnsignedIntegralTypes;
9344 for (unsigned I = 0; I != NumTypes; ++I)
9345 if (Context.getTypeSize(Types[I]) > BitWidth)
9351 EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum,
9352 EnumConstantDecl *LastEnumConst,
9353 SourceLocation IdLoc,
9356 unsigned IntWidth = Context.getTargetInfo().getIntWidth();
9357 llvm::APSInt EnumVal(IntWidth);
9360 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue))
9364 if (Enum->isDependentType() || Val->isTypeDependent())
9365 EltTy = Context.DependentTy;
9367 // C99 6.7.2.2p2: Make sure we have an integer constant expression.
9368 SourceLocation ExpLoc;
9369 if (!Val->isValueDependent() &&
9370 VerifyIntegerConstantExpression(Val, &EnumVal)) {
9373 if (!getLangOptions().CPlusPlus) {
9375 // The expression that defines the value of an enumeration constant
9376 // shall be an integer constant expression that has a value
9377 // representable as an int.
9379 // Complain if the value is not representable in an int.
9380 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy))
9381 Diag(IdLoc, diag::ext_enum_value_not_int)
9382 << EnumVal.toString(10) << Val->getSourceRange()
9383 << (EnumVal.isUnsigned() || EnumVal.isNonNegative());
9384 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) {
9385 // Force the type of the expression to 'int'.
9386 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take();
9390 if (Enum->isFixed()) {
9391 EltTy = Enum->getIntegerType();
9393 // C++0x [dcl.enum]p5:
9394 // ... if the initializing value of an enumerator cannot be
9395 // represented by the underlying type, the program is ill-formed.
9396 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) {
9397 if (getLangOptions().MicrosoftExt) {
9398 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy;
9399 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take();
9401 Diag(IdLoc, diag::err_enumerator_too_large)
9404 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take();
9407 // C++0x [dcl.enum]p5:
9408 // If the underlying type is not fixed, the type of each enumerator
9409 // is the type of its initializing value:
9410 // - If an initializer is specified for an enumerator, the
9411 // initializing value has the same type as the expression.
9412 EltTy = Val->getType();
9419 if (Enum->isDependentType())
9420 EltTy = Context.DependentTy;
9421 else if (!LastEnumConst) {
9422 // C++0x [dcl.enum]p5:
9423 // If the underlying type is not fixed, the type of each enumerator
9424 // is the type of its initializing value:
9425 // - If no initializer is specified for the first enumerator, the
9426 // initializing value has an unspecified integral type.
9428 // GCC uses 'int' for its unspecified integral type, as does
9430 if (Enum->isFixed()) {
9431 EltTy = Enum->getIntegerType();
9434 EltTy = Context.IntTy;
9437 // Assign the last value + 1.
9438 EnumVal = LastEnumConst->getInitVal();
9440 EltTy = LastEnumConst->getType();
9442 // Check for overflow on increment.
9443 if (EnumVal < LastEnumConst->getInitVal()) {
9444 // C++0x [dcl.enum]p5:
9445 // If the underlying type is not fixed, the type of each enumerator
9446 // is the type of its initializing value:
9448 // - Otherwise the type of the initializing value is the same as
9449 // the type of the initializing value of the preceding enumerator
9450 // unless the incremented value is not representable in that type,
9451 // in which case the type is an unspecified integral type
9452 // sufficient to contain the incremented value. If no such type
9453 // exists, the program is ill-formed.
9454 QualType T = getNextLargerIntegralType(Context, EltTy);
9455 if (T.isNull() || Enum->isFixed()) {
9456 // There is no integral type larger enough to represent this
9457 // value. Complain, then allow the value to wrap around.
9458 EnumVal = LastEnumConst->getInitVal();
9459 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2);
9461 if (Enum->isFixed())
9462 // When the underlying type is fixed, this is ill-formed.
9463 Diag(IdLoc, diag::err_enumerator_wrapped)
9464 << EnumVal.toString(10)
9467 Diag(IdLoc, diag::warn_enumerator_too_large)
9468 << EnumVal.toString(10);
9473 // Retrieve the last enumerator's value, extent that type to the
9474 // type that is supposed to be large enough to represent the incremented
9475 // value, then increment.
9476 EnumVal = LastEnumConst->getInitVal();
9477 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType());
9478 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy));
9481 // If we're not in C++, diagnose the overflow of enumerator values,
9482 // which in C99 means that the enumerator value is not representable in
9483 // an int (C99 6.7.2.2p2). However, we support GCC's extension that
9484 // permits enumerator values that are representable in some larger
9486 if (!getLangOptions().CPlusPlus && !T.isNull())
9487 Diag(IdLoc, diag::warn_enum_value_overflow);
9488 } else if (!getLangOptions().CPlusPlus &&
9489 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) {
9490 // Enforce C99 6.7.2.2p2 even when we compute the next value.
9491 Diag(IdLoc, diag::ext_enum_value_not_int)
9492 << EnumVal.toString(10) << 1;
9497 if (!EltTy->isDependentType()) {
9498 // Make the enumerator value match the signedness and size of the
9499 // enumerator's type.
9500 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy));
9501 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType());
9504 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy,
9509 Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst,
9510 SourceLocation IdLoc, IdentifierInfo *Id,
9511 AttributeList *Attr,
9512 SourceLocation EqualLoc, Expr *val) {
9513 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl);
9514 EnumConstantDecl *LastEnumConst =
9515 cast_or_null<EnumConstantDecl>(lastEnumConst);
9516 Expr *Val = static_cast<Expr*>(val);
9518 // The scope passed in may not be a decl scope. Zip up the scope tree until
9519 // we find one that is.
9520 S = getNonFieldDeclScope(S);
9522 // Verify that there isn't already something declared with this name in this
9524 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName,
9526 if (PrevDecl && PrevDecl->isTemplateParameter()) {
9527 // Maybe we will complain about the shadowed template parameter.
9528 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl);
9529 // Just pretend that we didn't see the previous declaration.
9534 // When in C++, we may get a TagDecl with the same name; in this case the
9535 // enum constant will 'hide' the tag.
9536 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) &&
9537 "Received TagDecl when not in C++!");
9538 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) {
9539 if (isa<EnumConstantDecl>(PrevDecl))
9540 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id;
9542 Diag(IdLoc, diag::err_redefinition) << Id;
9543 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
9548 // C++ [class.mem]p13:
9549 // If T is the name of a class, then each of the following shall have a
9550 // name different from T:
9551 // - every enumerator of every member of class T that is an enumerated
9553 if (CXXRecordDecl *Record
9554 = dyn_cast<CXXRecordDecl>(
9555 TheEnumDecl->getDeclContext()->getRedeclContext()))
9556 if (Record->getIdentifier() && Record->getIdentifier() == Id)
9557 Diag(IdLoc, diag::err_member_name_of_class) << Id;
9559 EnumConstantDecl *New =
9560 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val);
9563 // Process attributes.
9564 if (Attr) ProcessDeclAttributeList(S, New, Attr);
9566 // Register this decl in the current scope stack.
9567 New->setAccess(TheEnumDecl->getAccess());
9568 PushOnScopeChains(New, S);
9574 void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc,
9575 SourceLocation RBraceLoc, Decl *EnumDeclX,
9576 Decl **Elements, unsigned NumElements,
9577 Scope *S, AttributeList *Attr) {
9578 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX);
9579 QualType EnumType = Context.getTypeDeclType(Enum);
9582 ProcessDeclAttributeList(S, Enum, Attr);
9584 if (Enum->isDependentType()) {
9585 for (unsigned i = 0; i != NumElements; ++i) {
9586 EnumConstantDecl *ECD =
9587 cast_or_null<EnumConstantDecl>(Elements[i]);
9590 ECD->setType(EnumType);
9593 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0);
9597 // TODO: If the result value doesn't fit in an int, it must be a long or long
9598 // long value. ISO C does not support this, but GCC does as an extension,
9600 unsigned IntWidth = Context.getTargetInfo().getIntWidth();
9601 unsigned CharWidth = Context.getTargetInfo().getCharWidth();
9602 unsigned ShortWidth = Context.getTargetInfo().getShortWidth();
9604 // Verify that all the values are okay, compute the size of the values, and
9605 // reverse the list.
9606 unsigned NumNegativeBits = 0;
9607 unsigned NumPositiveBits = 0;
9609 // Keep track of whether all elements have type int.
9610 bool AllElementsInt = true;
9612 for (unsigned i = 0; i != NumElements; ++i) {
9613 EnumConstantDecl *ECD =
9614 cast_or_null<EnumConstantDecl>(Elements[i]);
9615 if (!ECD) continue; // Already issued a diagnostic.
9617 const llvm::APSInt &InitVal = ECD->getInitVal();
9619 // Keep track of the size of positive and negative values.
9620 if (InitVal.isUnsigned() || InitVal.isNonNegative())
9621 NumPositiveBits = std::max(NumPositiveBits,
9622 (unsigned)InitVal.getActiveBits());
9624 NumNegativeBits = std::max(NumNegativeBits,
9625 (unsigned)InitVal.getMinSignedBits());
9627 // Keep track of whether every enum element has type int (very commmon).
9629 AllElementsInt = ECD->getType() == Context.IntTy;
9632 // Figure out the type that should be used for this enum.
9636 // C++0x N3000 [conv.prom]p3:
9637 // An rvalue of an unscoped enumeration type whose underlying
9638 // type is not fixed can be converted to an rvalue of the first
9639 // of the following types that can represent all the values of
9640 // the enumeration: int, unsigned int, long int, unsigned long
9641 // int, long long int, or unsigned long long int.
9643 // An identifier declared as an enumeration constant has type int.
9644 // The C99 rule is modified by a gcc extension
9645 QualType BestPromotionType;
9647 bool Packed = Enum->getAttr<PackedAttr>() ? true : false;
9648 // -fshort-enums is the equivalent to specifying the packed attribute on all
9649 // enum definitions.
9650 if (LangOpts.ShortEnums)
9653 if (Enum->isFixed()) {
9654 BestType = BestPromotionType = Enum->getIntegerType();
9655 // We don't need to set BestWidth, because BestType is going to be the type
9656 // of the enumerators, but we do anyway because otherwise some compilers
9657 // warn that it might be used uninitialized.
9658 BestWidth = CharWidth;
9660 else if (NumNegativeBits) {
9661 // If there is a negative value, figure out the smallest integer type (of
9662 // int/long/longlong) that fits.
9663 // If it's packed, check also if it fits a char or a short.
9664 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) {
9665 BestType = Context.SignedCharTy;
9666 BestWidth = CharWidth;
9667 } else if (Packed && NumNegativeBits <= ShortWidth &&
9668 NumPositiveBits < ShortWidth) {
9669 BestType = Context.ShortTy;
9670 BestWidth = ShortWidth;
9671 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) {
9672 BestType = Context.IntTy;
9673 BestWidth = IntWidth;
9675 BestWidth = Context.getTargetInfo().getLongWidth();
9677 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) {
9678 BestType = Context.LongTy;
9680 BestWidth = Context.getTargetInfo().getLongLongWidth();
9682 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth)
9683 Diag(Enum->getLocation(), diag::warn_enum_too_large);
9684 BestType = Context.LongLongTy;
9687 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType);
9689 // If there is no negative value, figure out the smallest type that fits
9690 // all of the enumerator values.
9691 // If it's packed, check also if it fits a char or a short.
9692 if (Packed && NumPositiveBits <= CharWidth) {
9693 BestType = Context.UnsignedCharTy;
9694 BestPromotionType = Context.IntTy;
9695 BestWidth = CharWidth;
9696 } else if (Packed && NumPositiveBits <= ShortWidth) {
9697 BestType = Context.UnsignedShortTy;
9698 BestPromotionType = Context.IntTy;
9699 BestWidth = ShortWidth;
9700 } else if (NumPositiveBits <= IntWidth) {
9701 BestType = Context.UnsignedIntTy;
9702 BestWidth = IntWidth;
9704 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus)
9705 ? Context.UnsignedIntTy : Context.IntTy;
9706 } else if (NumPositiveBits <=
9707 (BestWidth = Context.getTargetInfo().getLongWidth())) {
9708 BestType = Context.UnsignedLongTy;
9710 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus)
9711 ? Context.UnsignedLongTy : Context.LongTy;
9713 BestWidth = Context.getTargetInfo().getLongLongWidth();
9714 assert(NumPositiveBits <= BestWidth &&
9715 "How could an initializer get larger than ULL?");
9716 BestType = Context.UnsignedLongLongTy;
9718 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus)
9719 ? Context.UnsignedLongLongTy : Context.LongLongTy;
9723 // Loop over all of the enumerator constants, changing their types to match
9724 // the type of the enum if needed.
9725 for (unsigned i = 0; i != NumElements; ++i) {
9726 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]);
9727 if (!ECD) continue; // Already issued a diagnostic.
9729 // Standard C says the enumerators have int type, but we allow, as an
9730 // extension, the enumerators to be larger than int size. If each
9731 // enumerator value fits in an int, type it as an int, otherwise type it the
9732 // same as the enumerator decl itself. This means that in "enum { X = 1U }"
9733 // that X has type 'int', not 'unsigned'.
9735 // Determine whether the value fits into an int.
9736 llvm::APSInt InitVal = ECD->getInitVal();
9738 // If it fits into an integer type, force it. Otherwise force it to match
9739 // the enum decl type.
9743 if (!getLangOptions().CPlusPlus &&
9744 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) {
9745 NewTy = Context.IntTy;
9746 NewWidth = IntWidth;
9748 } else if (ECD->getType() == BestType) {
9749 // Already the right type!
9750 if (getLangOptions().CPlusPlus)
9751 // C++ [dcl.enum]p4: Following the closing brace of an
9752 // enum-specifier, each enumerator has the type of its
9754 ECD->setType(EnumType);
9758 NewWidth = BestWidth;
9759 NewSign = BestType->isSignedIntegerOrEnumerationType();
9762 // Adjust the APSInt value.
9763 InitVal = InitVal.extOrTrunc(NewWidth);
9764 InitVal.setIsSigned(NewSign);
9765 ECD->setInitVal(InitVal);
9767 // Adjust the Expr initializer and type.
9768 if (ECD->getInitExpr() &&
9769 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType()))
9770 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy,
9775 if (getLangOptions().CPlusPlus)
9776 // C++ [dcl.enum]p4: Following the closing brace of an
9777 // enum-specifier, each enumerator has the type of its
9779 ECD->setType(EnumType);
9781 ECD->setType(NewTy);
9784 Enum->completeDefinition(BestType, BestPromotionType,
9785 NumPositiveBits, NumNegativeBits);
9788 Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr,
9789 SourceLocation StartLoc,
9790 SourceLocation EndLoc) {
9791 StringLiteral *AsmString = cast<StringLiteral>(expr);
9793 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext,
9794 AsmString, StartLoc,
9796 CurContext->addDecl(New);
9800 DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc,
9801 IdentifierInfo &ModuleName,
9802 SourceLocation ModuleNameLoc) {
9803 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc,
9804 ModuleName, ModuleNameLoc);
9808 // FIXME: Actually create a declaration to describe the module import.
9810 return DeclResult((Decl *)0);
9814 Sema::diagnoseModulePrivateRedeclaration(NamedDecl *New, NamedDecl *Old,
9815 SourceLocation ModulePrivateKeyword) {
9816 assert(!Old->isModulePrivate() && "Old is module-private!");
9818 Diag(New->getLocation(), diag::err_module_private_follows_public)
9819 << New->getDeclName() << SourceRange(ModulePrivateKeyword);
9820 Diag(Old->getLocation(), diag::note_previous_declaration)
9821 << Old->getDeclName();
9823 // Drop the __module_private__ from the new declaration, since it's invalid.
9824 New->setModulePrivate(false);
9827 void Sema::ActOnPragmaWeakID(IdentifierInfo* Name,
9828 SourceLocation PragmaLoc,
9829 SourceLocation NameLoc) {
9830 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName);
9833 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context));
9835 (void)WeakUndeclaredIdentifiers.insert(
9836 std::pair<IdentifierInfo*,WeakInfo>
9837 (Name, WeakInfo((IdentifierInfo*)0, NameLoc)));
9841 void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name,
9842 IdentifierInfo* AliasName,
9843 SourceLocation PragmaLoc,
9844 SourceLocation NameLoc,
9845 SourceLocation AliasNameLoc) {
9846 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc,
9847 LookupOrdinaryName);
9848 WeakInfo W = WeakInfo(Name, NameLoc);
9851 if (!PrevDecl->hasAttr<AliasAttr>())
9852 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl))
9853 DeclApplyPragmaWeak(TUScope, ND, W);
9855 (void)WeakUndeclaredIdentifiers.insert(
9856 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W));
9860 Decl *Sema::getObjCDeclContext() const {
9861 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext));
9864 AvailabilityResult Sema::getCurContextAvailability() const {
9865 const Decl *D = cast<Decl>(getCurLexicalContext());
9866 // A category implicitly has the availability of the interface.
9867 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D))
9868 D = CatD->getClassInterface();
9870 return D->getAvailability();