1 //===--- SemaDeclObjC.cpp - Semantic Analysis for ObjC 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 Objective C declarations.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Sema/SemaInternal.h"
15 #include "clang/Sema/Lookup.h"
16 #include "clang/Sema/ExternalSemaSource.h"
17 #include "clang/Sema/Scope.h"
18 #include "clang/Sema/ScopeInfo.h"
19 #include "clang/AST/ASTConsumer.h"
20 #include "clang/AST/Expr.h"
21 #include "clang/AST/ExprObjC.h"
22 #include "clang/AST/ASTContext.h"
23 #include "clang/AST/DeclObjC.h"
24 #include "clang/AST/ASTMutationListener.h"
25 #include "clang/Basic/SourceManager.h"
26 #include "clang/Sema/DeclSpec.h"
27 #include "clang/Lex/Preprocessor.h"
28 #include "llvm/ADT/DenseSet.h"
30 using namespace clang;
32 /// Check whether the given method, which must be in the 'init'
33 /// family, is a valid member of that family.
35 /// \param receiverTypeIfCall - if null, check this as if declaring it;
36 /// if non-null, check this as if making a call to it with the given
39 /// \return true to indicate that there was an error and appropriate
40 /// actions were taken
41 bool Sema::checkInitMethod(ObjCMethodDecl *method,
42 QualType receiverTypeIfCall) {
43 if (method->isInvalidDecl()) return true;
45 // This castAs is safe: methods that don't return an object
46 // pointer won't be inferred as inits and will reject an explicit
47 // objc_method_family(init).
49 // We ignore protocols here. Should we? What about Class?
51 const ObjCObjectType *result = method->getResultType()
52 ->castAs<ObjCObjectPointerType>()->getObjectType();
54 if (result->isObjCId()) {
56 } else if (result->isObjCClass()) {
57 // fall through: always an error
59 ObjCInterfaceDecl *resultClass = result->getInterface();
60 assert(resultClass && "unexpected object type!");
62 // It's okay for the result type to still be a forward declaration
63 // if we're checking an interface declaration.
64 if (!resultClass->hasDefinition()) {
65 if (receiverTypeIfCall.isNull() &&
66 !isa<ObjCImplementationDecl>(method->getDeclContext()))
69 // Otherwise, we try to compare class types.
71 // If this method was declared in a protocol, we can't check
72 // anything unless we have a receiver type that's an interface.
73 const ObjCInterfaceDecl *receiverClass = 0;
74 if (isa<ObjCProtocolDecl>(method->getDeclContext())) {
75 if (receiverTypeIfCall.isNull())
78 receiverClass = receiverTypeIfCall->castAs<ObjCObjectPointerType>()
81 // This can be null for calls to e.g. id<Foo>.
82 if (!receiverClass) return false;
84 receiverClass = method->getClassInterface();
85 assert(receiverClass && "method not associated with a class!");
88 // If either class is a subclass of the other, it's fine.
89 if (receiverClass->isSuperClassOf(resultClass) ||
90 resultClass->isSuperClassOf(receiverClass))
95 SourceLocation loc = method->getLocation();
97 // If we're in a system header, and this is not a call, just make
98 // the method unusable.
99 if (receiverTypeIfCall.isNull() && getSourceManager().isInSystemHeader(loc)) {
100 method->addAttr(new (Context) UnavailableAttr(loc, Context,
101 "init method returns a type unrelated to its receiver type"));
105 // Otherwise, it's an error.
106 Diag(loc, diag::err_arc_init_method_unrelated_result_type);
107 method->setInvalidDecl();
111 void Sema::CheckObjCMethodOverride(ObjCMethodDecl *NewMethod,
112 const ObjCMethodDecl *Overridden,
113 bool IsImplementation) {
114 if (Overridden->hasRelatedResultType() &&
115 !NewMethod->hasRelatedResultType()) {
116 // This can only happen when the method follows a naming convention that
117 // implies a related result type, and the original (overridden) method has
118 // a suitable return type, but the new (overriding) method does not have
119 // a suitable return type.
120 QualType ResultType = NewMethod->getResultType();
121 SourceRange ResultTypeRange;
122 if (const TypeSourceInfo *ResultTypeInfo
123 = NewMethod->getResultTypeSourceInfo())
124 ResultTypeRange = ResultTypeInfo->getTypeLoc().getSourceRange();
126 // Figure out which class this method is part of, if any.
127 ObjCInterfaceDecl *CurrentClass
128 = dyn_cast<ObjCInterfaceDecl>(NewMethod->getDeclContext());
130 DeclContext *DC = NewMethod->getDeclContext();
131 if (ObjCCategoryDecl *Cat = dyn_cast<ObjCCategoryDecl>(DC))
132 CurrentClass = Cat->getClassInterface();
133 else if (ObjCImplDecl *Impl = dyn_cast<ObjCImplDecl>(DC))
134 CurrentClass = Impl->getClassInterface();
135 else if (ObjCCategoryImplDecl *CatImpl
136 = dyn_cast<ObjCCategoryImplDecl>(DC))
137 CurrentClass = CatImpl->getClassInterface();
141 Diag(NewMethod->getLocation(),
142 diag::warn_related_result_type_compatibility_class)
143 << Context.getObjCInterfaceType(CurrentClass)
147 Diag(NewMethod->getLocation(),
148 diag::warn_related_result_type_compatibility_protocol)
153 if (ObjCMethodFamily Family = Overridden->getMethodFamily())
154 Diag(Overridden->getLocation(),
155 diag::note_related_result_type_overridden_family)
158 Diag(Overridden->getLocation(),
159 diag::note_related_result_type_overridden);
161 if (getLangOpts().ObjCAutoRefCount) {
162 if ((NewMethod->hasAttr<NSReturnsRetainedAttr>() !=
163 Overridden->hasAttr<NSReturnsRetainedAttr>())) {
164 Diag(NewMethod->getLocation(),
165 diag::err_nsreturns_retained_attribute_mismatch) << 1;
166 Diag(Overridden->getLocation(), diag::note_previous_decl)
169 if ((NewMethod->hasAttr<NSReturnsNotRetainedAttr>() !=
170 Overridden->hasAttr<NSReturnsNotRetainedAttr>())) {
171 Diag(NewMethod->getLocation(),
172 diag::err_nsreturns_retained_attribute_mismatch) << 0;
173 Diag(Overridden->getLocation(), diag::note_previous_decl)
176 ObjCMethodDecl::param_const_iterator oi = Overridden->param_begin(),
177 oe = Overridden->param_end();
178 for (ObjCMethodDecl::param_iterator
179 ni = NewMethod->param_begin(), ne = NewMethod->param_end();
180 ni != ne && oi != oe; ++ni, ++oi) {
181 const ParmVarDecl *oldDecl = (*oi);
182 ParmVarDecl *newDecl = (*ni);
183 if (newDecl->hasAttr<NSConsumedAttr>() !=
184 oldDecl->hasAttr<NSConsumedAttr>()) {
185 Diag(newDecl->getLocation(),
186 diag::err_nsconsumed_attribute_mismatch);
187 Diag(oldDecl->getLocation(), diag::note_previous_decl)
194 /// \brief Check a method declaration for compatibility with the Objective-C
196 static bool CheckARCMethodDecl(Sema &S, ObjCMethodDecl *method) {
197 ObjCMethodFamily family = method->getMethodFamily();
203 case OMF_autorelease:
204 case OMF_retainCount:
206 case OMF_performSelector:
210 if (!S.Context.hasSameType(method->getResultType(), S.Context.VoidTy)) {
211 SourceRange ResultTypeRange;
212 if (const TypeSourceInfo *ResultTypeInfo
213 = method->getResultTypeSourceInfo())
214 ResultTypeRange = ResultTypeInfo->getTypeLoc().getSourceRange();
215 if (ResultTypeRange.isInvalid())
216 S.Diag(method->getLocation(), diag::error_dealloc_bad_result_type)
217 << method->getResultType()
218 << FixItHint::CreateInsertion(method->getSelectorLoc(0), "(void)");
220 S.Diag(method->getLocation(), diag::error_dealloc_bad_result_type)
221 << method->getResultType()
222 << FixItHint::CreateReplacement(ResultTypeRange, "void");
228 // If the method doesn't obey the init rules, don't bother annotating it.
229 if (S.checkInitMethod(method, QualType()))
232 method->addAttr(new (S.Context) NSConsumesSelfAttr(SourceLocation(),
235 // Don't add a second copy of this attribute, but otherwise don't
236 // let it be suppressed.
237 if (method->hasAttr<NSReturnsRetainedAttr>())
243 case OMF_mutableCopy:
245 if (method->hasAttr<NSReturnsRetainedAttr>() ||
246 method->hasAttr<NSReturnsNotRetainedAttr>() ||
247 method->hasAttr<NSReturnsAutoreleasedAttr>())
252 method->addAttr(new (S.Context) NSReturnsRetainedAttr(SourceLocation(),
257 static void DiagnoseObjCImplementedDeprecations(Sema &S,
259 SourceLocation ImplLoc,
261 if (ND && ND->isDeprecated()) {
262 S.Diag(ImplLoc, diag::warn_deprecated_def) << select;
264 S.Diag(ND->getLocation(), diag::note_method_declared_at)
265 << ND->getDeclName();
267 S.Diag(ND->getLocation(), diag::note_previous_decl) << "class";
271 /// AddAnyMethodToGlobalPool - Add any method, instance or factory to global
273 void Sema::AddAnyMethodToGlobalPool(Decl *D) {
274 ObjCMethodDecl *MDecl = dyn_cast_or_null<ObjCMethodDecl>(D);
276 // If we don't have a valid method decl, simply return.
279 if (MDecl->isInstanceMethod())
280 AddInstanceMethodToGlobalPool(MDecl, true);
282 AddFactoryMethodToGlobalPool(MDecl, true);
285 /// ActOnStartOfObjCMethodDef - This routine sets up parameters; invisible
286 /// and user declared, in the method definition's AST.
287 void Sema::ActOnStartOfObjCMethodDef(Scope *FnBodyScope, Decl *D) {
288 assert((getCurMethodDecl() == 0) && "Methodparsing confused");
289 ObjCMethodDecl *MDecl = dyn_cast_or_null<ObjCMethodDecl>(D);
291 // If we don't have a valid method decl, simply return.
295 // Allow all of Sema to see that we are entering a method definition.
296 PushDeclContext(FnBodyScope, MDecl);
299 // Create Decl objects for each parameter, entrring them in the scope for
300 // binding to their use.
302 // Insert the invisible arguments, self and _cmd!
303 MDecl->createImplicitParams(Context, MDecl->getClassInterface());
305 PushOnScopeChains(MDecl->getSelfDecl(), FnBodyScope);
306 PushOnScopeChains(MDecl->getCmdDecl(), FnBodyScope);
308 // Introduce all of the other parameters into this scope.
309 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(),
310 E = MDecl->param_end(); PI != E; ++PI) {
311 ParmVarDecl *Param = (*PI);
312 if (!Param->isInvalidDecl() &&
313 RequireCompleteType(Param->getLocation(), Param->getType(),
314 diag::err_typecheck_decl_incomplete_type))
315 Param->setInvalidDecl();
316 if ((*PI)->getIdentifier())
317 PushOnScopeChains(*PI, FnBodyScope);
320 // In ARC, disallow definition of retain/release/autorelease/retainCount
321 if (getLangOpts().ObjCAutoRefCount) {
322 switch (MDecl->getMethodFamily()) {
324 case OMF_retainCount:
326 case OMF_autorelease:
327 Diag(MDecl->getLocation(), diag::err_arc_illegal_method_def)
328 << MDecl->getSelector();
336 case OMF_mutableCopy:
340 case OMF_performSelector:
345 // Warn on deprecated methods under -Wdeprecated-implementations,
346 // and prepare for warning on missing super calls.
347 if (ObjCInterfaceDecl *IC = MDecl->getClassInterface()) {
348 if (ObjCMethodDecl *IMD =
349 IC->lookupMethod(MDecl->getSelector(), MDecl->isInstanceMethod()))
350 DiagnoseObjCImplementedDeprecations(*this,
351 dyn_cast<NamedDecl>(IMD),
352 MDecl->getLocation(), 0);
354 // If this is "dealloc" or "finalize", set some bit here.
355 // Then in ActOnSuperMessage() (SemaExprObjC), set it back to false.
356 // Finally, in ActOnFinishFunctionBody() (SemaDecl), warn if flag is set.
357 // Only do this if the current class actually has a superclass.
358 if (IC->getSuperClass()) {
359 getCurFunction()->ObjCShouldCallSuperDealloc =
360 !(Context.getLangOpts().ObjCAutoRefCount ||
361 Context.getLangOpts().getGC() == LangOptions::GCOnly) &&
362 MDecl->getMethodFamily() == OMF_dealloc;
363 getCurFunction()->ObjCShouldCallSuperFinalize =
364 Context.getLangOpts().getGC() != LangOptions::NonGC &&
365 MDecl->getMethodFamily() == OMF_finalize;
372 // Callback to only accept typo corrections that are Objective-C classes.
373 // If an ObjCInterfaceDecl* is given to the constructor, then the validation
374 // function will reject corrections to that class.
375 class ObjCInterfaceValidatorCCC : public CorrectionCandidateCallback {
377 ObjCInterfaceValidatorCCC() : CurrentIDecl(0) {}
378 explicit ObjCInterfaceValidatorCCC(ObjCInterfaceDecl *IDecl)
379 : CurrentIDecl(IDecl) {}
381 virtual bool ValidateCandidate(const TypoCorrection &candidate) {
382 ObjCInterfaceDecl *ID = candidate.getCorrectionDeclAs<ObjCInterfaceDecl>();
383 return ID && !declaresSameEntity(ID, CurrentIDecl);
387 ObjCInterfaceDecl *CurrentIDecl;
393 ActOnStartClassInterface(SourceLocation AtInterfaceLoc,
394 IdentifierInfo *ClassName, SourceLocation ClassLoc,
395 IdentifierInfo *SuperName, SourceLocation SuperLoc,
396 Decl * const *ProtoRefs, unsigned NumProtoRefs,
397 const SourceLocation *ProtoLocs,
398 SourceLocation EndProtoLoc, AttributeList *AttrList) {
399 assert(ClassName && "Missing class identifier");
401 // Check for another declaration kind with the same name.
402 NamedDecl *PrevDecl = LookupSingleName(TUScope, ClassName, ClassLoc,
403 LookupOrdinaryName, ForRedeclaration);
405 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
406 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName;
407 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
410 // Create a declaration to describe this @interface.
411 ObjCInterfaceDecl* PrevIDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
412 ObjCInterfaceDecl *IDecl
413 = ObjCInterfaceDecl::Create(Context, CurContext, AtInterfaceLoc, ClassName,
414 PrevIDecl, ClassLoc);
417 // Class already seen. Was it a definition?
418 if (ObjCInterfaceDecl *Def = PrevIDecl->getDefinition()) {
419 Diag(AtInterfaceLoc, diag::err_duplicate_class_def)
420 << PrevIDecl->getDeclName();
421 Diag(Def->getLocation(), diag::note_previous_definition);
422 IDecl->setInvalidDecl();
427 ProcessDeclAttributeList(TUScope, IDecl, AttrList);
428 PushOnScopeChains(IDecl, TUScope);
430 // Start the definition of this class. If we're in a redefinition case, there
431 // may already be a definition, so we'll end up adding to it.
432 if (!IDecl->hasDefinition())
433 IDecl->startDefinition();
436 // Check if a different kind of symbol declared in this scope.
437 PrevDecl = LookupSingleName(TUScope, SuperName, SuperLoc,
441 // Try to correct for a typo in the superclass name without correcting
442 // to the class we're defining.
443 ObjCInterfaceValidatorCCC Validator(IDecl);
444 if (TypoCorrection Corrected = CorrectTypo(
445 DeclarationNameInfo(SuperName, SuperLoc), LookupOrdinaryName, TUScope,
447 PrevDecl = Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>();
448 Diag(SuperLoc, diag::err_undef_superclass_suggest)
449 << SuperName << ClassName << PrevDecl->getDeclName();
450 Diag(PrevDecl->getLocation(), diag::note_previous_decl)
451 << PrevDecl->getDeclName();
455 if (declaresSameEntity(PrevDecl, IDecl)) {
456 Diag(SuperLoc, diag::err_recursive_superclass)
457 << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc);
458 IDecl->setEndOfDefinitionLoc(ClassLoc);
460 ObjCInterfaceDecl *SuperClassDecl =
461 dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
463 // Diagnose classes that inherit from deprecated classes.
465 (void)DiagnoseUseOfDecl(SuperClassDecl, SuperLoc);
467 if (PrevDecl && SuperClassDecl == 0) {
468 // The previous declaration was not a class decl. Check if we have a
469 // typedef. If we do, get the underlying class type.
470 if (const TypedefNameDecl *TDecl =
471 dyn_cast_or_null<TypedefNameDecl>(PrevDecl)) {
472 QualType T = TDecl->getUnderlyingType();
473 if (T->isObjCObjectType()) {
474 if (NamedDecl *IDecl = T->getAs<ObjCObjectType>()->getInterface())
475 SuperClassDecl = dyn_cast<ObjCInterfaceDecl>(IDecl);
479 // This handles the following case:
481 // typedef int SuperClass;
482 // @interface MyClass : SuperClass {} @end
484 if (!SuperClassDecl) {
485 Diag(SuperLoc, diag::err_redefinition_different_kind) << SuperName;
486 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
490 if (!dyn_cast_or_null<TypedefNameDecl>(PrevDecl)) {
492 Diag(SuperLoc, diag::err_undef_superclass)
493 << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc);
494 else if (RequireCompleteType(SuperLoc,
495 Context.getObjCInterfaceType(SuperClassDecl),
496 diag::err_forward_superclass,
497 SuperClassDecl->getDeclName(),
499 SourceRange(AtInterfaceLoc, ClassLoc))) {
503 IDecl->setSuperClass(SuperClassDecl);
504 IDecl->setSuperClassLoc(SuperLoc);
505 IDecl->setEndOfDefinitionLoc(SuperLoc);
507 } else { // we have a root class.
508 IDecl->setEndOfDefinitionLoc(ClassLoc);
511 // Check then save referenced protocols.
513 IDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs,
515 IDecl->setEndOfDefinitionLoc(EndProtoLoc);
518 CheckObjCDeclScope(IDecl);
519 return ActOnObjCContainerStartDefinition(IDecl);
522 /// ActOnCompatibilityAlias - this action is called after complete parsing of
523 /// a \@compatibility_alias declaration. It sets up the alias relationships.
524 Decl *Sema::ActOnCompatibilityAlias(SourceLocation AtLoc,
525 IdentifierInfo *AliasName,
526 SourceLocation AliasLocation,
527 IdentifierInfo *ClassName,
528 SourceLocation ClassLocation) {
529 // Look for previous declaration of alias name
530 NamedDecl *ADecl = LookupSingleName(TUScope, AliasName, AliasLocation,
531 LookupOrdinaryName, ForRedeclaration);
533 if (isa<ObjCCompatibleAliasDecl>(ADecl))
534 Diag(AliasLocation, diag::warn_previous_alias_decl);
536 Diag(AliasLocation, diag::err_conflicting_aliasing_type) << AliasName;
537 Diag(ADecl->getLocation(), diag::note_previous_declaration);
540 // Check for class declaration
541 NamedDecl *CDeclU = LookupSingleName(TUScope, ClassName, ClassLocation,
542 LookupOrdinaryName, ForRedeclaration);
543 if (const TypedefNameDecl *TDecl =
544 dyn_cast_or_null<TypedefNameDecl>(CDeclU)) {
545 QualType T = TDecl->getUnderlyingType();
546 if (T->isObjCObjectType()) {
547 if (NamedDecl *IDecl = T->getAs<ObjCObjectType>()->getInterface()) {
548 ClassName = IDecl->getIdentifier();
549 CDeclU = LookupSingleName(TUScope, ClassName, ClassLocation,
550 LookupOrdinaryName, ForRedeclaration);
554 ObjCInterfaceDecl *CDecl = dyn_cast_or_null<ObjCInterfaceDecl>(CDeclU);
556 Diag(ClassLocation, diag::warn_undef_interface) << ClassName;
558 Diag(CDeclU->getLocation(), diag::note_previous_declaration);
562 // Everything checked out, instantiate a new alias declaration AST.
563 ObjCCompatibleAliasDecl *AliasDecl =
564 ObjCCompatibleAliasDecl::Create(Context, CurContext, AtLoc, AliasName, CDecl);
566 if (!CheckObjCDeclScope(AliasDecl))
567 PushOnScopeChains(AliasDecl, TUScope);
572 bool Sema::CheckForwardProtocolDeclarationForCircularDependency(
573 IdentifierInfo *PName,
574 SourceLocation &Ploc, SourceLocation PrevLoc,
575 const ObjCList<ObjCProtocolDecl> &PList) {
578 for (ObjCList<ObjCProtocolDecl>::iterator I = PList.begin(),
579 E = PList.end(); I != E; ++I) {
580 if (ObjCProtocolDecl *PDecl = LookupProtocol((*I)->getIdentifier(),
582 if (PDecl->getIdentifier() == PName) {
583 Diag(Ploc, diag::err_protocol_has_circular_dependency);
584 Diag(PrevLoc, diag::note_previous_definition);
588 if (!PDecl->hasDefinition())
591 if (CheckForwardProtocolDeclarationForCircularDependency(PName, Ploc,
592 PDecl->getLocation(), PDecl->getReferencedProtocols()))
600 Sema::ActOnStartProtocolInterface(SourceLocation AtProtoInterfaceLoc,
601 IdentifierInfo *ProtocolName,
602 SourceLocation ProtocolLoc,
603 Decl * const *ProtoRefs,
604 unsigned NumProtoRefs,
605 const SourceLocation *ProtoLocs,
606 SourceLocation EndProtoLoc,
607 AttributeList *AttrList) {
609 // FIXME: Deal with AttrList.
610 assert(ProtocolName && "Missing protocol identifier");
611 ObjCProtocolDecl *PrevDecl = LookupProtocol(ProtocolName, ProtocolLoc,
613 ObjCProtocolDecl *PDecl = 0;
614 if (ObjCProtocolDecl *Def = PrevDecl? PrevDecl->getDefinition() : 0) {
615 // If we already have a definition, complain.
616 Diag(ProtocolLoc, diag::warn_duplicate_protocol_def) << ProtocolName;
617 Diag(Def->getLocation(), diag::note_previous_definition);
619 // Create a new protocol that is completely distinct from previous
620 // declarations, and do not make this protocol available for name lookup.
621 // That way, we'll end up completely ignoring the duplicate.
622 // FIXME: Can we turn this into an error?
623 PDecl = ObjCProtocolDecl::Create(Context, CurContext, ProtocolName,
624 ProtocolLoc, AtProtoInterfaceLoc,
626 PDecl->startDefinition();
629 // Check for circular dependencies among protocol declarations. This can
630 // only happen if this protocol was forward-declared.
631 ObjCList<ObjCProtocolDecl> PList;
632 PList.set((ObjCProtocolDecl *const*)ProtoRefs, NumProtoRefs, Context);
633 err = CheckForwardProtocolDeclarationForCircularDependency(
634 ProtocolName, ProtocolLoc, PrevDecl->getLocation(), PList);
637 // Create the new declaration.
638 PDecl = ObjCProtocolDecl::Create(Context, CurContext, ProtocolName,
639 ProtocolLoc, AtProtoInterfaceLoc,
640 /*PrevDecl=*/PrevDecl);
642 PushOnScopeChains(PDecl, TUScope);
643 PDecl->startDefinition();
647 ProcessDeclAttributeList(TUScope, PDecl, AttrList);
649 // Merge attributes from previous declarations.
651 mergeDeclAttributes(PDecl, PrevDecl);
653 if (!err && NumProtoRefs ) {
654 /// Check then save referenced protocols.
655 PDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs,
659 CheckObjCDeclScope(PDecl);
660 return ActOnObjCContainerStartDefinition(PDecl);
663 /// FindProtocolDeclaration - This routine looks up protocols and
664 /// issues an error if they are not declared. It returns list of
665 /// protocol declarations in its 'Protocols' argument.
667 Sema::FindProtocolDeclaration(bool WarnOnDeclarations,
668 const IdentifierLocPair *ProtocolId,
669 unsigned NumProtocols,
670 SmallVectorImpl<Decl *> &Protocols) {
671 for (unsigned i = 0; i != NumProtocols; ++i) {
672 ObjCProtocolDecl *PDecl = LookupProtocol(ProtocolId[i].first,
673 ProtocolId[i].second);
675 DeclFilterCCC<ObjCProtocolDecl> Validator;
676 TypoCorrection Corrected = CorrectTypo(
677 DeclarationNameInfo(ProtocolId[i].first, ProtocolId[i].second),
678 LookupObjCProtocolName, TUScope, NULL, Validator);
679 if ((PDecl = Corrected.getCorrectionDeclAs<ObjCProtocolDecl>())) {
680 Diag(ProtocolId[i].second, diag::err_undeclared_protocol_suggest)
681 << ProtocolId[i].first << Corrected.getCorrection();
682 Diag(PDecl->getLocation(), diag::note_previous_decl)
683 << PDecl->getDeclName();
688 Diag(ProtocolId[i].second, diag::err_undeclared_protocol)
689 << ProtocolId[i].first;
693 (void)DiagnoseUseOfDecl(PDecl, ProtocolId[i].second);
695 // If this is a forward declaration and we are supposed to warn in this
697 if (WarnOnDeclarations && !PDecl->hasDefinition())
698 Diag(ProtocolId[i].second, diag::warn_undef_protocolref)
699 << ProtocolId[i].first;
700 Protocols.push_back(PDecl);
704 /// DiagnoseClassExtensionDupMethods - Check for duplicate declaration of
705 /// a class method in its extension.
707 void Sema::DiagnoseClassExtensionDupMethods(ObjCCategoryDecl *CAT,
708 ObjCInterfaceDecl *ID) {
710 return; // Possibly due to previous error
712 llvm::DenseMap<Selector, const ObjCMethodDecl*> MethodMap;
713 for (ObjCInterfaceDecl::method_iterator i = ID->meth_begin(),
714 e = ID->meth_end(); i != e; ++i) {
715 ObjCMethodDecl *MD = *i;
716 MethodMap[MD->getSelector()] = MD;
719 if (MethodMap.empty())
721 for (ObjCCategoryDecl::method_iterator i = CAT->meth_begin(),
722 e = CAT->meth_end(); i != e; ++i) {
723 ObjCMethodDecl *Method = *i;
724 const ObjCMethodDecl *&PrevMethod = MethodMap[Method->getSelector()];
725 if (PrevMethod && !MatchTwoMethodDeclarations(Method, PrevMethod)) {
726 Diag(Method->getLocation(), diag::err_duplicate_method_decl)
727 << Method->getDeclName();
728 Diag(PrevMethod->getLocation(), diag::note_previous_declaration);
733 /// ActOnForwardProtocolDeclaration - Handle \@protocol foo;
735 Sema::ActOnForwardProtocolDeclaration(SourceLocation AtProtocolLoc,
736 const IdentifierLocPair *IdentList,
738 AttributeList *attrList) {
739 SmallVector<Decl *, 8> DeclsInGroup;
740 for (unsigned i = 0; i != NumElts; ++i) {
741 IdentifierInfo *Ident = IdentList[i].first;
742 ObjCProtocolDecl *PrevDecl = LookupProtocol(Ident, IdentList[i].second,
744 ObjCProtocolDecl *PDecl
745 = ObjCProtocolDecl::Create(Context, CurContext, Ident,
746 IdentList[i].second, AtProtocolLoc,
749 PushOnScopeChains(PDecl, TUScope);
750 CheckObjCDeclScope(PDecl);
753 ProcessDeclAttributeList(TUScope, PDecl, attrList);
756 mergeDeclAttributes(PDecl, PrevDecl);
758 DeclsInGroup.push_back(PDecl);
761 return BuildDeclaratorGroup(DeclsInGroup.data(), DeclsInGroup.size(), false);
765 ActOnStartCategoryInterface(SourceLocation AtInterfaceLoc,
766 IdentifierInfo *ClassName, SourceLocation ClassLoc,
767 IdentifierInfo *CategoryName,
768 SourceLocation CategoryLoc,
769 Decl * const *ProtoRefs,
770 unsigned NumProtoRefs,
771 const SourceLocation *ProtoLocs,
772 SourceLocation EndProtoLoc) {
773 ObjCCategoryDecl *CDecl;
774 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true);
776 /// Check that class of this category is already completely declared.
779 || RequireCompleteType(ClassLoc, Context.getObjCInterfaceType(IDecl),
780 diag::err_category_forward_interface,
781 CategoryName == 0)) {
782 // Create an invalid ObjCCategoryDecl to serve as context for
783 // the enclosing method declarations. We mark the decl invalid
784 // to make it clear that this isn't a valid AST.
785 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc,
786 ClassLoc, CategoryLoc, CategoryName,IDecl);
787 CDecl->setInvalidDecl();
788 CurContext->addDecl(CDecl);
791 Diag(ClassLoc, diag::err_undef_interface) << ClassName;
792 return ActOnObjCContainerStartDefinition(CDecl);
795 if (!CategoryName && IDecl->getImplementation()) {
796 Diag(ClassLoc, diag::err_class_extension_after_impl) << ClassName;
797 Diag(IDecl->getImplementation()->getLocation(),
798 diag::note_implementation_declared);
802 /// Check for duplicate interface declaration for this category
803 ObjCCategoryDecl *CDeclChain;
804 for (CDeclChain = IDecl->getCategoryList(); CDeclChain;
805 CDeclChain = CDeclChain->getNextClassCategory()) {
806 if (CDeclChain->getIdentifier() == CategoryName) {
807 // Class extensions can be declared multiple times.
808 Diag(CategoryLoc, diag::warn_dup_category_def)
809 << ClassName << CategoryName;
810 Diag(CDeclChain->getLocation(), diag::note_previous_definition);
816 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc,
817 ClassLoc, CategoryLoc, CategoryName, IDecl);
818 // FIXME: PushOnScopeChains?
819 CurContext->addDecl(CDecl);
822 CDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs,
824 // Protocols in the class extension belong to the class.
825 if (CDecl->IsClassExtension())
826 IDecl->mergeClassExtensionProtocolList((ObjCProtocolDecl**)ProtoRefs,
827 NumProtoRefs, Context);
830 CheckObjCDeclScope(CDecl);
831 return ActOnObjCContainerStartDefinition(CDecl);
834 /// ActOnStartCategoryImplementation - Perform semantic checks on the
835 /// category implementation declaration and build an ObjCCategoryImplDecl
837 Decl *Sema::ActOnStartCategoryImplementation(
838 SourceLocation AtCatImplLoc,
839 IdentifierInfo *ClassName, SourceLocation ClassLoc,
840 IdentifierInfo *CatName, SourceLocation CatLoc) {
841 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true);
842 ObjCCategoryDecl *CatIDecl = 0;
843 if (IDecl && IDecl->hasDefinition()) {
844 CatIDecl = IDecl->FindCategoryDeclaration(CatName);
846 // Category @implementation with no corresponding @interface.
847 // Create and install one.
848 CatIDecl = ObjCCategoryDecl::Create(Context, CurContext, AtCatImplLoc,
851 CatIDecl->setImplicit();
855 ObjCCategoryImplDecl *CDecl =
856 ObjCCategoryImplDecl::Create(Context, CurContext, CatName, IDecl,
857 ClassLoc, AtCatImplLoc, CatLoc);
858 /// Check that class of this category is already completely declared.
860 Diag(ClassLoc, diag::err_undef_interface) << ClassName;
861 CDecl->setInvalidDecl();
862 } else if (RequireCompleteType(ClassLoc, Context.getObjCInterfaceType(IDecl),
863 diag::err_undef_interface)) {
864 CDecl->setInvalidDecl();
867 // FIXME: PushOnScopeChains?
868 CurContext->addDecl(CDecl);
870 // If the interface is deprecated/unavailable, warn/error about it.
872 DiagnoseUseOfDecl(IDecl, ClassLoc);
874 /// Check that CatName, category name, is not used in another implementation.
876 if (CatIDecl->getImplementation()) {
877 Diag(ClassLoc, diag::err_dup_implementation_category) << ClassName
879 Diag(CatIDecl->getImplementation()->getLocation(),
880 diag::note_previous_definition);
882 CatIDecl->setImplementation(CDecl);
883 // Warn on implementating category of deprecated class under
884 // -Wdeprecated-implementations flag.
885 DiagnoseObjCImplementedDeprecations(*this,
886 dyn_cast<NamedDecl>(IDecl),
887 CDecl->getLocation(), 2);
891 CheckObjCDeclScope(CDecl);
892 return ActOnObjCContainerStartDefinition(CDecl);
895 Decl *Sema::ActOnStartClassImplementation(
896 SourceLocation AtClassImplLoc,
897 IdentifierInfo *ClassName, SourceLocation ClassLoc,
898 IdentifierInfo *SuperClassname,
899 SourceLocation SuperClassLoc) {
900 ObjCInterfaceDecl* IDecl = 0;
901 // Check for another declaration kind with the same name.
903 = LookupSingleName(TUScope, ClassName, ClassLoc, LookupOrdinaryName,
905 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
906 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName;
907 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
908 } else if ((IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl))) {
909 RequireCompleteType(ClassLoc, Context.getObjCInterfaceType(IDecl),
910 diag::warn_undef_interface);
912 // We did not find anything with the name ClassName; try to correct for
913 // typos in the class name.
914 ObjCInterfaceValidatorCCC Validator;
915 if (TypoCorrection Corrected = CorrectTypo(
916 DeclarationNameInfo(ClassName, ClassLoc), LookupOrdinaryName, TUScope,
918 // Suggest the (potentially) correct interface name. However, put the
919 // fix-it hint itself in a separate note, since changing the name in
920 // the warning would make the fix-it change semantics.However, don't
921 // provide a code-modification hint or use the typo name for recovery,
922 // because this is just a warning. The program may actually be correct.
923 IDecl = Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>();
924 DeclarationName CorrectedName = Corrected.getCorrection();
925 Diag(ClassLoc, diag::warn_undef_interface_suggest)
926 << ClassName << CorrectedName;
927 Diag(IDecl->getLocation(), diag::note_previous_decl) << CorrectedName
928 << FixItHint::CreateReplacement(ClassLoc, CorrectedName.getAsString());
931 Diag(ClassLoc, diag::warn_undef_interface) << ClassName;
935 // Check that super class name is valid class name
936 ObjCInterfaceDecl* SDecl = 0;
937 if (SuperClassname) {
938 // Check if a different kind of symbol declared in this scope.
939 PrevDecl = LookupSingleName(TUScope, SuperClassname, SuperClassLoc,
941 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
942 Diag(SuperClassLoc, diag::err_redefinition_different_kind)
944 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
946 SDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
947 if (SDecl && !SDecl->hasDefinition())
950 Diag(SuperClassLoc, diag::err_undef_superclass)
951 << SuperClassname << ClassName;
952 else if (IDecl && !declaresSameEntity(IDecl->getSuperClass(), SDecl)) {
953 // This implementation and its interface do not have the same
955 Diag(SuperClassLoc, diag::err_conflicting_super_class)
956 << SDecl->getDeclName();
957 Diag(SDecl->getLocation(), diag::note_previous_definition);
963 // Legacy case of @implementation with no corresponding @interface.
964 // Build, chain & install the interface decl into the identifier.
966 // FIXME: Do we support attributes on the @implementation? If so we should
968 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtClassImplLoc,
969 ClassName, /*PrevDecl=*/0, ClassLoc,
971 IDecl->startDefinition();
973 IDecl->setSuperClass(SDecl);
974 IDecl->setSuperClassLoc(SuperClassLoc);
975 IDecl->setEndOfDefinitionLoc(SuperClassLoc);
977 IDecl->setEndOfDefinitionLoc(ClassLoc);
980 PushOnScopeChains(IDecl, TUScope);
982 // Mark the interface as being completed, even if it was just as
984 // declaration; the user cannot reopen it.
985 if (!IDecl->hasDefinition())
986 IDecl->startDefinition();
989 ObjCImplementationDecl* IMPDecl =
990 ObjCImplementationDecl::Create(Context, CurContext, IDecl, SDecl,
991 ClassLoc, AtClassImplLoc);
993 if (CheckObjCDeclScope(IMPDecl))
994 return ActOnObjCContainerStartDefinition(IMPDecl);
996 // Check that there is no duplicate implementation of this class.
997 if (IDecl->getImplementation()) {
998 // FIXME: Don't leak everything!
999 Diag(ClassLoc, diag::err_dup_implementation_class) << ClassName;
1000 Diag(IDecl->getImplementation()->getLocation(),
1001 diag::note_previous_definition);
1002 } else { // add it to the list.
1003 IDecl->setImplementation(IMPDecl);
1004 PushOnScopeChains(IMPDecl, TUScope);
1005 // Warn on implementating deprecated class under
1006 // -Wdeprecated-implementations flag.
1007 DiagnoseObjCImplementedDeprecations(*this,
1008 dyn_cast<NamedDecl>(IDecl),
1009 IMPDecl->getLocation(), 1);
1011 return ActOnObjCContainerStartDefinition(IMPDecl);
1014 Sema::DeclGroupPtrTy
1015 Sema::ActOnFinishObjCImplementation(Decl *ObjCImpDecl, ArrayRef<Decl *> Decls) {
1016 SmallVector<Decl *, 64> DeclsInGroup;
1017 DeclsInGroup.reserve(Decls.size() + 1);
1019 for (unsigned i = 0, e = Decls.size(); i != e; ++i) {
1020 Decl *Dcl = Decls[i];
1023 if (Dcl->getDeclContext()->isFileContext())
1024 Dcl->setTopLevelDeclInObjCContainer();
1025 DeclsInGroup.push_back(Dcl);
1028 DeclsInGroup.push_back(ObjCImpDecl);
1030 return BuildDeclaratorGroup(DeclsInGroup.data(), DeclsInGroup.size(), false);
1033 void Sema::CheckImplementationIvars(ObjCImplementationDecl *ImpDecl,
1034 ObjCIvarDecl **ivars, unsigned numIvars,
1035 SourceLocation RBrace) {
1036 assert(ImpDecl && "missing implementation decl");
1037 ObjCInterfaceDecl* IDecl = ImpDecl->getClassInterface();
1040 /// Check case of non-existing \@interface decl.
1041 /// (legacy objective-c \@implementation decl without an \@interface decl).
1042 /// Add implementations's ivar to the synthesize class's ivar list.
1043 if (IDecl->isImplicitInterfaceDecl()) {
1044 IDecl->setEndOfDefinitionLoc(RBrace);
1045 // Add ivar's to class's DeclContext.
1046 for (unsigned i = 0, e = numIvars; i != e; ++i) {
1047 ivars[i]->setLexicalDeclContext(ImpDecl);
1048 IDecl->makeDeclVisibleInContext(ivars[i]);
1049 ImpDecl->addDecl(ivars[i]);
1054 // If implementation has empty ivar list, just return.
1058 assert(ivars && "missing @implementation ivars");
1059 if (LangOpts.ObjCRuntime.isNonFragile()) {
1060 if (ImpDecl->getSuperClass())
1061 Diag(ImpDecl->getLocation(), diag::warn_on_superclass_use);
1062 for (unsigned i = 0; i < numIvars; i++) {
1063 ObjCIvarDecl* ImplIvar = ivars[i];
1064 if (const ObjCIvarDecl *ClsIvar =
1065 IDecl->getIvarDecl(ImplIvar->getIdentifier())) {
1066 Diag(ImplIvar->getLocation(), diag::err_duplicate_ivar_declaration);
1067 Diag(ClsIvar->getLocation(), diag::note_previous_definition);
1070 // Instance ivar to Implementation's DeclContext.
1071 ImplIvar->setLexicalDeclContext(ImpDecl);
1072 IDecl->makeDeclVisibleInContext(ImplIvar);
1073 ImpDecl->addDecl(ImplIvar);
1077 // Check interface's Ivar list against those in the implementation.
1078 // names and types must match.
1081 ObjCInterfaceDecl::ivar_iterator
1082 IVI = IDecl->ivar_begin(), IVE = IDecl->ivar_end();
1083 for (; numIvars > 0 && IVI != IVE; ++IVI) {
1084 ObjCIvarDecl* ImplIvar = ivars[j++];
1085 ObjCIvarDecl* ClsIvar = *IVI;
1086 assert (ImplIvar && "missing implementation ivar");
1087 assert (ClsIvar && "missing class ivar");
1089 // First, make sure the types match.
1090 if (!Context.hasSameType(ImplIvar->getType(), ClsIvar->getType())) {
1091 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_type)
1092 << ImplIvar->getIdentifier()
1093 << ImplIvar->getType() << ClsIvar->getType();
1094 Diag(ClsIvar->getLocation(), diag::note_previous_definition);
1095 } else if (ImplIvar->isBitField() && ClsIvar->isBitField() &&
1096 ImplIvar->getBitWidthValue(Context) !=
1097 ClsIvar->getBitWidthValue(Context)) {
1098 Diag(ImplIvar->getBitWidth()->getLocStart(),
1099 diag::err_conflicting_ivar_bitwidth) << ImplIvar->getIdentifier();
1100 Diag(ClsIvar->getBitWidth()->getLocStart(),
1101 diag::note_previous_definition);
1103 // Make sure the names are identical.
1104 if (ImplIvar->getIdentifier() != ClsIvar->getIdentifier()) {
1105 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_name)
1106 << ImplIvar->getIdentifier() << ClsIvar->getIdentifier();
1107 Diag(ClsIvar->getLocation(), diag::note_previous_definition);
1113 Diag(ivars[j]->getLocation(), diag::err_inconsistant_ivar_count);
1114 else if (IVI != IVE)
1115 Diag(IVI->getLocation(), diag::err_inconsistant_ivar_count);
1118 void Sema::WarnUndefinedMethod(SourceLocation ImpLoc, ObjCMethodDecl *method,
1119 bool &IncompleteImpl, unsigned DiagID) {
1120 // No point warning no definition of method which is 'unavailable'.
1121 if (method->hasAttr<UnavailableAttr>())
1123 if (!IncompleteImpl) {
1124 Diag(ImpLoc, diag::warn_incomplete_impl);
1125 IncompleteImpl = true;
1127 if (DiagID == diag::warn_unimplemented_protocol_method)
1128 Diag(ImpLoc, DiagID) << method->getDeclName();
1130 Diag(method->getLocation(), DiagID) << method->getDeclName();
1133 /// Determines if type B can be substituted for type A. Returns true if we can
1134 /// guarantee that anything that the user will do to an object of type A can
1135 /// also be done to an object of type B. This is trivially true if the two
1136 /// types are the same, or if B is a subclass of A. It becomes more complex
1137 /// in cases where protocols are involved.
1139 /// Object types in Objective-C describe the minimum requirements for an
1140 /// object, rather than providing a complete description of a type. For
1141 /// example, if A is a subclass of B, then B* may refer to an instance of A.
1142 /// The principle of substitutability means that we may use an instance of A
1143 /// anywhere that we may use an instance of B - it will implement all of the
1144 /// ivars of B and all of the methods of B.
1146 /// This substitutability is important when type checking methods, because
1147 /// the implementation may have stricter type definitions than the interface.
1148 /// The interface specifies minimum requirements, but the implementation may
1149 /// have more accurate ones. For example, a method may privately accept
1150 /// instances of B, but only publish that it accepts instances of A. Any
1151 /// object passed to it will be type checked against B, and so will implicitly
1152 /// by a valid A*. Similarly, a method may return a subclass of the class that
1153 /// it is declared as returning.
1155 /// This is most important when considering subclassing. A method in a
1156 /// subclass must accept any object as an argument that its superclass's
1157 /// implementation accepts. It may, however, accept a more general type
1158 /// without breaking substitutability (i.e. you can still use the subclass
1159 /// anywhere that you can use the superclass, but not vice versa). The
1160 /// converse requirement applies to return types: the return type for a
1161 /// subclass method must be a valid object of the kind that the superclass
1162 /// advertises, but it may be specified more accurately. This avoids the need
1163 /// for explicit down-casting by callers.
1165 /// Note: This is a stricter requirement than for assignment.
1166 static bool isObjCTypeSubstitutable(ASTContext &Context,
1167 const ObjCObjectPointerType *A,
1168 const ObjCObjectPointerType *B,
1170 // Reject a protocol-unqualified id.
1171 if (rejectId && B->isObjCIdType()) return false;
1173 // If B is a qualified id, then A must also be a qualified id and it must
1174 // implement all of the protocols in B. It may not be a qualified class.
1175 // For example, MyClass<A> can be assigned to id<A>, but MyClass<A> is a
1176 // stricter definition so it is not substitutable for id<A>.
1177 if (B->isObjCQualifiedIdType()) {
1178 return A->isObjCQualifiedIdType() &&
1179 Context.ObjCQualifiedIdTypesAreCompatible(QualType(A, 0),
1185 // id is a special type that bypasses type checking completely. We want a
1186 // warning when it is used in one place but not another.
1187 if (C.isObjCIdType(A) || C.isObjCIdType(B)) return false;
1190 // If B is a qualified id, then A must also be a qualified id (which it isn't
1191 // if we've got this far)
1192 if (B->isObjCQualifiedIdType()) return false;
1195 // Now we know that A and B are (potentially-qualified) class types. The
1196 // normal rules for assignment apply.
1197 return Context.canAssignObjCInterfaces(A, B);
1200 static SourceRange getTypeRange(TypeSourceInfo *TSI) {
1201 return (TSI ? TSI->getTypeLoc().getSourceRange() : SourceRange());
1204 static bool CheckMethodOverrideReturn(Sema &S,
1205 ObjCMethodDecl *MethodImpl,
1206 ObjCMethodDecl *MethodDecl,
1207 bool IsProtocolMethodDecl,
1208 bool IsOverridingMode,
1210 if (IsProtocolMethodDecl &&
1211 (MethodDecl->getObjCDeclQualifier() !=
1212 MethodImpl->getObjCDeclQualifier())) {
1214 S.Diag(MethodImpl->getLocation(),
1216 diag::warn_conflicting_overriding_ret_type_modifiers
1217 : diag::warn_conflicting_ret_type_modifiers))
1218 << MethodImpl->getDeclName()
1219 << getTypeRange(MethodImpl->getResultTypeSourceInfo());
1220 S.Diag(MethodDecl->getLocation(), diag::note_previous_declaration)
1221 << getTypeRange(MethodDecl->getResultTypeSourceInfo());
1227 if (S.Context.hasSameUnqualifiedType(MethodImpl->getResultType(),
1228 MethodDecl->getResultType()))
1234 IsOverridingMode ? diag::warn_conflicting_overriding_ret_types
1235 : diag::warn_conflicting_ret_types;
1237 // Mismatches between ObjC pointers go into a different warning
1238 // category, and sometimes they're even completely whitelisted.
1239 if (const ObjCObjectPointerType *ImplPtrTy =
1240 MethodImpl->getResultType()->getAs<ObjCObjectPointerType>()) {
1241 if (const ObjCObjectPointerType *IfacePtrTy =
1242 MethodDecl->getResultType()->getAs<ObjCObjectPointerType>()) {
1243 // Allow non-matching return types as long as they don't violate
1244 // the principle of substitutability. Specifically, we permit
1245 // return types that are subclasses of the declared return type,
1246 // or that are more-qualified versions of the declared type.
1247 if (isObjCTypeSubstitutable(S.Context, IfacePtrTy, ImplPtrTy, false))
1251 IsOverridingMode ? diag::warn_non_covariant_overriding_ret_types
1252 : diag::warn_non_covariant_ret_types;
1256 S.Diag(MethodImpl->getLocation(), DiagID)
1257 << MethodImpl->getDeclName()
1258 << MethodDecl->getResultType()
1259 << MethodImpl->getResultType()
1260 << getTypeRange(MethodImpl->getResultTypeSourceInfo());
1261 S.Diag(MethodDecl->getLocation(),
1262 IsOverridingMode ? diag::note_previous_declaration
1263 : diag::note_previous_definition)
1264 << getTypeRange(MethodDecl->getResultTypeSourceInfo());
1268 static bool CheckMethodOverrideParam(Sema &S,
1269 ObjCMethodDecl *MethodImpl,
1270 ObjCMethodDecl *MethodDecl,
1271 ParmVarDecl *ImplVar,
1272 ParmVarDecl *IfaceVar,
1273 bool IsProtocolMethodDecl,
1274 bool IsOverridingMode,
1276 if (IsProtocolMethodDecl &&
1277 (ImplVar->getObjCDeclQualifier() !=
1278 IfaceVar->getObjCDeclQualifier())) {
1280 if (IsOverridingMode)
1281 S.Diag(ImplVar->getLocation(),
1282 diag::warn_conflicting_overriding_param_modifiers)
1283 << getTypeRange(ImplVar->getTypeSourceInfo())
1284 << MethodImpl->getDeclName();
1285 else S.Diag(ImplVar->getLocation(),
1286 diag::warn_conflicting_param_modifiers)
1287 << getTypeRange(ImplVar->getTypeSourceInfo())
1288 << MethodImpl->getDeclName();
1289 S.Diag(IfaceVar->getLocation(), diag::note_previous_declaration)
1290 << getTypeRange(IfaceVar->getTypeSourceInfo());
1296 QualType ImplTy = ImplVar->getType();
1297 QualType IfaceTy = IfaceVar->getType();
1299 if (S.Context.hasSameUnqualifiedType(ImplTy, IfaceTy))
1305 IsOverridingMode ? diag::warn_conflicting_overriding_param_types
1306 : diag::warn_conflicting_param_types;
1308 // Mismatches between ObjC pointers go into a different warning
1309 // category, and sometimes they're even completely whitelisted.
1310 if (const ObjCObjectPointerType *ImplPtrTy =
1311 ImplTy->getAs<ObjCObjectPointerType>()) {
1312 if (const ObjCObjectPointerType *IfacePtrTy =
1313 IfaceTy->getAs<ObjCObjectPointerType>()) {
1314 // Allow non-matching argument types as long as they don't
1315 // violate the principle of substitutability. Specifically, the
1316 // implementation must accept any objects that the superclass
1317 // accepts, however it may also accept others.
1318 if (isObjCTypeSubstitutable(S.Context, ImplPtrTy, IfacePtrTy, true))
1322 IsOverridingMode ? diag::warn_non_contravariant_overriding_param_types
1323 : diag::warn_non_contravariant_param_types;
1327 S.Diag(ImplVar->getLocation(), DiagID)
1328 << getTypeRange(ImplVar->getTypeSourceInfo())
1329 << MethodImpl->getDeclName() << IfaceTy << ImplTy;
1330 S.Diag(IfaceVar->getLocation(),
1331 (IsOverridingMode ? diag::note_previous_declaration
1332 : diag::note_previous_definition))
1333 << getTypeRange(IfaceVar->getTypeSourceInfo());
1337 /// In ARC, check whether the conventional meanings of the two methods
1338 /// match. If they don't, it's a hard error.
1339 static bool checkMethodFamilyMismatch(Sema &S, ObjCMethodDecl *impl,
1340 ObjCMethodDecl *decl) {
1341 ObjCMethodFamily implFamily = impl->getMethodFamily();
1342 ObjCMethodFamily declFamily = decl->getMethodFamily();
1343 if (implFamily == declFamily) return false;
1345 // Since conventions are sorted by selector, the only possibility is
1346 // that the types differ enough to cause one selector or the other
1347 // to fall out of the family.
1348 assert(implFamily == OMF_None || declFamily == OMF_None);
1350 // No further diagnostics required on invalid declarations.
1351 if (impl->isInvalidDecl() || decl->isInvalidDecl()) return true;
1353 const ObjCMethodDecl *unmatched = impl;
1354 ObjCMethodFamily family = declFamily;
1355 unsigned errorID = diag::err_arc_lost_method_convention;
1356 unsigned noteID = diag::note_arc_lost_method_convention;
1357 if (declFamily == OMF_None) {
1359 family = implFamily;
1360 errorID = diag::err_arc_gained_method_convention;
1361 noteID = diag::note_arc_gained_method_convention;
1364 // Indexes into a %select clause in the diagnostic.
1365 enum FamilySelector {
1366 F_alloc, F_copy, F_mutableCopy = F_copy, F_init, F_new
1368 FamilySelector familySelector = FamilySelector();
1371 case OMF_None: llvm_unreachable("logic error, no method convention");
1374 case OMF_autorelease:
1377 case OMF_retainCount:
1379 case OMF_performSelector:
1380 // Mismatches for these methods don't change ownership
1381 // conventions, so we don't care.
1384 case OMF_init: familySelector = F_init; break;
1385 case OMF_alloc: familySelector = F_alloc; break;
1386 case OMF_copy: familySelector = F_copy; break;
1387 case OMF_mutableCopy: familySelector = F_mutableCopy; break;
1388 case OMF_new: familySelector = F_new; break;
1391 enum ReasonSelector { R_NonObjectReturn, R_UnrelatedReturn };
1392 ReasonSelector reasonSelector;
1394 // The only reason these methods don't fall within their families is
1395 // due to unusual result types.
1396 if (unmatched->getResultType()->isObjCObjectPointerType()) {
1397 reasonSelector = R_UnrelatedReturn;
1399 reasonSelector = R_NonObjectReturn;
1402 S.Diag(impl->getLocation(), errorID) << familySelector << reasonSelector;
1403 S.Diag(decl->getLocation(), noteID) << familySelector << reasonSelector;
1408 void Sema::WarnConflictingTypedMethods(ObjCMethodDecl *ImpMethodDecl,
1409 ObjCMethodDecl *MethodDecl,
1410 bool IsProtocolMethodDecl) {
1411 if (getLangOpts().ObjCAutoRefCount &&
1412 checkMethodFamilyMismatch(*this, ImpMethodDecl, MethodDecl))
1415 CheckMethodOverrideReturn(*this, ImpMethodDecl, MethodDecl,
1416 IsProtocolMethodDecl, false,
1419 for (ObjCMethodDecl::param_iterator IM = ImpMethodDecl->param_begin(),
1420 IF = MethodDecl->param_begin(), EM = ImpMethodDecl->param_end(),
1421 EF = MethodDecl->param_end();
1422 IM != EM && IF != EF; ++IM, ++IF) {
1423 CheckMethodOverrideParam(*this, ImpMethodDecl, MethodDecl, *IM, *IF,
1424 IsProtocolMethodDecl, false, true);
1427 if (ImpMethodDecl->isVariadic() != MethodDecl->isVariadic()) {
1428 Diag(ImpMethodDecl->getLocation(),
1429 diag::warn_conflicting_variadic);
1430 Diag(MethodDecl->getLocation(), diag::note_previous_declaration);
1434 void Sema::CheckConflictingOverridingMethod(ObjCMethodDecl *Method,
1435 ObjCMethodDecl *Overridden,
1436 bool IsProtocolMethodDecl) {
1438 CheckMethodOverrideReturn(*this, Method, Overridden,
1439 IsProtocolMethodDecl, true,
1442 for (ObjCMethodDecl::param_iterator IM = Method->param_begin(),
1443 IF = Overridden->param_begin(), EM = Method->param_end(),
1444 EF = Overridden->param_end();
1445 IM != EM && IF != EF; ++IM, ++IF) {
1446 CheckMethodOverrideParam(*this, Method, Overridden, *IM, *IF,
1447 IsProtocolMethodDecl, true, true);
1450 if (Method->isVariadic() != Overridden->isVariadic()) {
1451 Diag(Method->getLocation(),
1452 diag::warn_conflicting_overriding_variadic);
1453 Diag(Overridden->getLocation(), diag::note_previous_declaration);
1457 /// WarnExactTypedMethods - This routine issues a warning if method
1458 /// implementation declaration matches exactly that of its declaration.
1459 void Sema::WarnExactTypedMethods(ObjCMethodDecl *ImpMethodDecl,
1460 ObjCMethodDecl *MethodDecl,
1461 bool IsProtocolMethodDecl) {
1462 // don't issue warning when protocol method is optional because primary
1463 // class is not required to implement it and it is safe for protocol
1465 if (MethodDecl->getImplementationControl() == ObjCMethodDecl::Optional)
1467 // don't issue warning when primary class's method is
1468 // depecated/unavailable.
1469 if (MethodDecl->hasAttr<UnavailableAttr>() ||
1470 MethodDecl->hasAttr<DeprecatedAttr>())
1473 bool match = CheckMethodOverrideReturn(*this, ImpMethodDecl, MethodDecl,
1474 IsProtocolMethodDecl, false, false);
1476 for (ObjCMethodDecl::param_iterator IM = ImpMethodDecl->param_begin(),
1477 IF = MethodDecl->param_begin(), EM = ImpMethodDecl->param_end(),
1478 EF = MethodDecl->param_end();
1479 IM != EM && IF != EF; ++IM, ++IF) {
1480 match = CheckMethodOverrideParam(*this, ImpMethodDecl, MethodDecl,
1482 IsProtocolMethodDecl, false, false);
1487 match = (ImpMethodDecl->isVariadic() == MethodDecl->isVariadic());
1489 match = !(MethodDecl->isClassMethod() &&
1490 MethodDecl->getSelector() == GetNullarySelector("load", Context));
1493 Diag(ImpMethodDecl->getLocation(),
1494 diag::warn_category_method_impl_match);
1495 Diag(MethodDecl->getLocation(), diag::note_method_declared_at)
1496 << MethodDecl->getDeclName();
1500 /// FIXME: Type hierarchies in Objective-C can be deep. We could most likely
1501 /// improve the efficiency of selector lookups and type checking by associating
1502 /// with each protocol / interface / category the flattened instance tables. If
1503 /// we used an immutable set to keep the table then it wouldn't add significant
1504 /// memory cost and it would be handy for lookups.
1506 /// CheckProtocolMethodDefs - This routine checks unimplemented methods
1507 /// Declared in protocol, and those referenced by it.
1508 void Sema::CheckProtocolMethodDefs(SourceLocation ImpLoc,
1509 ObjCProtocolDecl *PDecl,
1510 bool& IncompleteImpl,
1511 const SelectorSet &InsMap,
1512 const SelectorSet &ClsMap,
1513 ObjCContainerDecl *CDecl) {
1514 ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl);
1515 ObjCInterfaceDecl *IDecl = C ? C->getClassInterface()
1516 : dyn_cast<ObjCInterfaceDecl>(CDecl);
1517 assert (IDecl && "CheckProtocolMethodDefs - IDecl is null");
1519 ObjCInterfaceDecl *Super = IDecl->getSuperClass();
1520 ObjCInterfaceDecl *NSIDecl = 0;
1521 if (getLangOpts().ObjCRuntime.isNeXTFamily()) {
1522 // check to see if class implements forwardInvocation method and objects
1523 // of this class are derived from 'NSProxy' so that to forward requests
1524 // from one object to another.
1525 // Under such conditions, which means that every method possible is
1526 // implemented in the class, we should not issue "Method definition not
1528 // FIXME: Use a general GetUnarySelector method for this.
1529 IdentifierInfo* II = &Context.Idents.get("forwardInvocation");
1530 Selector fISelector = Context.Selectors.getSelector(1, &II);
1531 if (InsMap.count(fISelector))
1532 // Is IDecl derived from 'NSProxy'? If so, no instance methods
1533 // need be implemented in the implementation.
1534 NSIDecl = IDecl->lookupInheritedClass(&Context.Idents.get("NSProxy"));
1537 // If a method lookup fails locally we still need to look and see if
1538 // the method was implemented by a base class or an inherited
1539 // protocol. This lookup is slow, but occurs rarely in correct code
1540 // and otherwise would terminate in a warning.
1542 // check unimplemented instance methods.
1544 for (ObjCProtocolDecl::instmeth_iterator I = PDecl->instmeth_begin(),
1545 E = PDecl->instmeth_end(); I != E; ++I) {
1546 ObjCMethodDecl *method = *I;
1547 if (method->getImplementationControl() != ObjCMethodDecl::Optional &&
1548 !method->isSynthesized() && !InsMap.count(method->getSelector()) &&
1550 !Super->lookupInstanceMethod(method->getSelector()))) {
1551 // If a method is not implemented in the category implementation but
1552 // has been declared in its primary class, superclass,
1553 // or in one of their protocols, no need to issue the warning.
1554 // This is because method will be implemented in the primary class
1555 // or one of its super class implementation.
1557 // Ugly, but necessary. Method declared in protcol might have
1558 // have been synthesized due to a property declared in the class which
1559 // uses the protocol.
1560 if (ObjCMethodDecl *MethodInClass =
1561 IDecl->lookupInstanceMethod(method->getSelector(),
1562 true /*shallowCategoryLookup*/))
1563 if (C || MethodInClass->isSynthesized())
1565 unsigned DIAG = diag::warn_unimplemented_protocol_method;
1566 if (Diags.getDiagnosticLevel(DIAG, ImpLoc)
1567 != DiagnosticsEngine::Ignored) {
1568 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG);
1569 Diag(method->getLocation(), diag::note_method_declared_at)
1570 << method->getDeclName();
1571 Diag(CDecl->getLocation(), diag::note_required_for_protocol_at)
1572 << PDecl->getDeclName();
1576 // check unimplemented class methods
1577 for (ObjCProtocolDecl::classmeth_iterator
1578 I = PDecl->classmeth_begin(), E = PDecl->classmeth_end();
1580 ObjCMethodDecl *method = *I;
1581 if (method->getImplementationControl() != ObjCMethodDecl::Optional &&
1582 !ClsMap.count(method->getSelector()) &&
1583 (!Super || !Super->lookupClassMethod(method->getSelector()))) {
1584 // See above comment for instance method lookups.
1585 if (C && IDecl->lookupClassMethod(method->getSelector(),
1586 true /*shallowCategoryLookup*/))
1588 unsigned DIAG = diag::warn_unimplemented_protocol_method;
1589 if (Diags.getDiagnosticLevel(DIAG, ImpLoc) !=
1590 DiagnosticsEngine::Ignored) {
1591 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG);
1592 Diag(method->getLocation(), diag::note_method_declared_at)
1593 << method->getDeclName();
1594 Diag(IDecl->getLocation(), diag::note_required_for_protocol_at) <<
1595 PDecl->getDeclName();
1599 // Check on this protocols's referenced protocols, recursively.
1600 for (ObjCProtocolDecl::protocol_iterator PI = PDecl->protocol_begin(),
1601 E = PDecl->protocol_end(); PI != E; ++PI)
1602 CheckProtocolMethodDefs(ImpLoc, *PI, IncompleteImpl, InsMap, ClsMap, CDecl);
1605 /// MatchAllMethodDeclarations - Check methods declared in interface
1606 /// or protocol against those declared in their implementations.
1608 void Sema::MatchAllMethodDeclarations(const SelectorSet &InsMap,
1609 const SelectorSet &ClsMap,
1610 SelectorSet &InsMapSeen,
1611 SelectorSet &ClsMapSeen,
1612 ObjCImplDecl* IMPDecl,
1613 ObjCContainerDecl* CDecl,
1614 bool &IncompleteImpl,
1615 bool ImmediateClass,
1616 bool WarnCategoryMethodImpl) {
1617 // Check and see if instance methods in class interface have been
1618 // implemented in the implementation class. If so, their types match.
1619 for (ObjCInterfaceDecl::instmeth_iterator I = CDecl->instmeth_begin(),
1620 E = CDecl->instmeth_end(); I != E; ++I) {
1621 if (InsMapSeen.count((*I)->getSelector()))
1623 InsMapSeen.insert((*I)->getSelector());
1624 if (!(*I)->isSynthesized() &&
1625 !InsMap.count((*I)->getSelector())) {
1627 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl,
1628 diag::note_undef_method_impl);
1631 ObjCMethodDecl *ImpMethodDecl =
1632 IMPDecl->getInstanceMethod((*I)->getSelector());
1633 assert(CDecl->getInstanceMethod((*I)->getSelector()) &&
1634 "Expected to find the method through lookup as well");
1635 ObjCMethodDecl *MethodDecl = *I;
1636 // ImpMethodDecl may be null as in a @dynamic property.
1637 if (ImpMethodDecl) {
1638 if (!WarnCategoryMethodImpl)
1639 WarnConflictingTypedMethods(ImpMethodDecl, MethodDecl,
1640 isa<ObjCProtocolDecl>(CDecl));
1641 else if (!MethodDecl->isSynthesized())
1642 WarnExactTypedMethods(ImpMethodDecl, MethodDecl,
1643 isa<ObjCProtocolDecl>(CDecl));
1648 // Check and see if class methods in class interface have been
1649 // implemented in the implementation class. If so, their types match.
1650 for (ObjCInterfaceDecl::classmeth_iterator
1651 I = CDecl->classmeth_begin(), E = CDecl->classmeth_end(); I != E; ++I) {
1652 if (ClsMapSeen.count((*I)->getSelector()))
1654 ClsMapSeen.insert((*I)->getSelector());
1655 if (!ClsMap.count((*I)->getSelector())) {
1657 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl,
1658 diag::note_undef_method_impl);
1660 ObjCMethodDecl *ImpMethodDecl =
1661 IMPDecl->getClassMethod((*I)->getSelector());
1662 assert(CDecl->getClassMethod((*I)->getSelector()) &&
1663 "Expected to find the method through lookup as well");
1664 ObjCMethodDecl *MethodDecl = *I;
1665 if (!WarnCategoryMethodImpl)
1666 WarnConflictingTypedMethods(ImpMethodDecl, MethodDecl,
1667 isa<ObjCProtocolDecl>(CDecl));
1669 WarnExactTypedMethods(ImpMethodDecl, MethodDecl,
1670 isa<ObjCProtocolDecl>(CDecl));
1674 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) {
1675 // Also methods in class extensions need be looked at next.
1676 for (const ObjCCategoryDecl *ClsExtDecl = I->getFirstClassExtension();
1677 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension())
1678 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen,
1680 const_cast<ObjCCategoryDecl *>(ClsExtDecl),
1681 IncompleteImpl, false,
1682 WarnCategoryMethodImpl);
1684 // Check for any implementation of a methods declared in protocol.
1685 for (ObjCInterfaceDecl::all_protocol_iterator
1686 PI = I->all_referenced_protocol_begin(),
1687 E = I->all_referenced_protocol_end(); PI != E; ++PI)
1688 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen,
1690 (*PI), IncompleteImpl, false,
1691 WarnCategoryMethodImpl);
1693 // FIXME. For now, we are not checking for extact match of methods
1694 // in category implementation and its primary class's super class.
1695 if (!WarnCategoryMethodImpl && I->getSuperClass())
1696 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen,
1698 I->getSuperClass(), IncompleteImpl, false);
1702 /// CheckCategoryVsClassMethodMatches - Checks that methods implemented in
1703 /// category matches with those implemented in its primary class and
1704 /// warns each time an exact match is found.
1705 void Sema::CheckCategoryVsClassMethodMatches(
1706 ObjCCategoryImplDecl *CatIMPDecl) {
1707 SelectorSet InsMap, ClsMap;
1709 for (ObjCImplementationDecl::instmeth_iterator
1710 I = CatIMPDecl->instmeth_begin(),
1711 E = CatIMPDecl->instmeth_end(); I!=E; ++I)
1712 InsMap.insert((*I)->getSelector());
1714 for (ObjCImplementationDecl::classmeth_iterator
1715 I = CatIMPDecl->classmeth_begin(),
1716 E = CatIMPDecl->classmeth_end(); I != E; ++I)
1717 ClsMap.insert((*I)->getSelector());
1718 if (InsMap.empty() && ClsMap.empty())
1721 // Get category's primary class.
1722 ObjCCategoryDecl *CatDecl = CatIMPDecl->getCategoryDecl();
1725 ObjCInterfaceDecl *IDecl = CatDecl->getClassInterface();
1728 SelectorSet InsMapSeen, ClsMapSeen;
1729 bool IncompleteImpl = false;
1730 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen,
1732 IncompleteImpl, false,
1733 true /*WarnCategoryMethodImpl*/);
1736 void Sema::ImplMethodsVsClassMethods(Scope *S, ObjCImplDecl* IMPDecl,
1737 ObjCContainerDecl* CDecl,
1738 bool IncompleteImpl) {
1740 // Check and see if instance methods in class interface have been
1741 // implemented in the implementation class.
1742 for (ObjCImplementationDecl::instmeth_iterator
1743 I = IMPDecl->instmeth_begin(), E = IMPDecl->instmeth_end(); I!=E; ++I)
1744 InsMap.insert((*I)->getSelector());
1746 // Check and see if properties declared in the interface have either 1)
1747 // an implementation or 2) there is a @synthesize/@dynamic implementation
1748 // of the property in the @implementation.
1749 if (const ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(CDecl))
1750 if (!(LangOpts.ObjCDefaultSynthProperties &&
1751 LangOpts.ObjCRuntime.isNonFragile()) ||
1752 IDecl->isObjCRequiresPropertyDefs())
1753 DiagnoseUnimplementedProperties(S, IMPDecl, CDecl, InsMap);
1756 for (ObjCImplementationDecl::classmeth_iterator
1757 I = IMPDecl->classmeth_begin(),
1758 E = IMPDecl->classmeth_end(); I != E; ++I)
1759 ClsMap.insert((*I)->getSelector());
1761 // Check for type conflict of methods declared in a class/protocol and
1762 // its implementation; if any.
1763 SelectorSet InsMapSeen, ClsMapSeen;
1764 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen,
1766 IncompleteImpl, true);
1768 // check all methods implemented in category against those declared
1769 // in its primary class.
1770 if (ObjCCategoryImplDecl *CatDecl =
1771 dyn_cast<ObjCCategoryImplDecl>(IMPDecl))
1772 CheckCategoryVsClassMethodMatches(CatDecl);
1774 // Check the protocol list for unimplemented methods in the @implementation
1776 // Check and see if class methods in class interface have been
1777 // implemented in the implementation class.
1779 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) {
1780 for (ObjCInterfaceDecl::all_protocol_iterator
1781 PI = I->all_referenced_protocol_begin(),
1782 E = I->all_referenced_protocol_end(); PI != E; ++PI)
1783 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl,
1785 // Check class extensions (unnamed categories)
1786 for (const ObjCCategoryDecl *Categories = I->getFirstClassExtension();
1787 Categories; Categories = Categories->getNextClassExtension())
1788 ImplMethodsVsClassMethods(S, IMPDecl,
1789 const_cast<ObjCCategoryDecl*>(Categories),
1791 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl)) {
1792 // For extended class, unimplemented methods in its protocols will
1793 // be reported in the primary class.
1794 if (!C->IsClassExtension()) {
1795 for (ObjCCategoryDecl::protocol_iterator PI = C->protocol_begin(),
1796 E = C->protocol_end(); PI != E; ++PI)
1797 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl,
1798 InsMap, ClsMap, CDecl);
1799 // Report unimplemented properties in the category as well.
1800 // When reporting on missing setter/getters, do not report when
1801 // setter/getter is implemented in category's primary class
1803 if (ObjCInterfaceDecl *ID = C->getClassInterface())
1804 if (ObjCImplDecl *IMP = ID->getImplementation()) {
1805 for (ObjCImplementationDecl::instmeth_iterator
1806 I = IMP->instmeth_begin(), E = IMP->instmeth_end(); I!=E; ++I)
1807 InsMap.insert((*I)->getSelector());
1809 DiagnoseUnimplementedProperties(S, IMPDecl, CDecl, InsMap);
1812 llvm_unreachable("invalid ObjCContainerDecl type.");
1815 /// ActOnForwardClassDeclaration -
1816 Sema::DeclGroupPtrTy
1817 Sema::ActOnForwardClassDeclaration(SourceLocation AtClassLoc,
1818 IdentifierInfo **IdentList,
1819 SourceLocation *IdentLocs,
1821 SmallVector<Decl *, 8> DeclsInGroup;
1822 for (unsigned i = 0; i != NumElts; ++i) {
1823 // Check for another declaration kind with the same name.
1825 = LookupSingleName(TUScope, IdentList[i], IdentLocs[i],
1826 LookupOrdinaryName, ForRedeclaration);
1827 if (PrevDecl && PrevDecl->isTemplateParameter()) {
1828 // Maybe we will complain about the shadowed template parameter.
1829 DiagnoseTemplateParameterShadow(AtClassLoc, PrevDecl);
1830 // Just pretend that we didn't see the previous declaration.
1834 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
1835 // GCC apparently allows the following idiom:
1837 // typedef NSObject < XCElementTogglerP > XCElementToggler;
1838 // @class XCElementToggler;
1840 // Here we have chosen to ignore the forward class declaration
1841 // with a warning. Since this is the implied behavior.
1842 TypedefNameDecl *TDD = dyn_cast<TypedefNameDecl>(PrevDecl);
1843 if (!TDD || !TDD->getUnderlyingType()->isObjCObjectType()) {
1844 Diag(AtClassLoc, diag::err_redefinition_different_kind) << IdentList[i];
1845 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
1847 // a forward class declaration matching a typedef name of a class refers
1848 // to the underlying class. Just ignore the forward class with a warning
1849 // as this will force the intended behavior which is to lookup the typedef
1851 if (isa<ObjCObjectType>(TDD->getUnderlyingType())) {
1852 Diag(AtClassLoc, diag::warn_forward_class_redefinition) << IdentList[i];
1853 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
1859 // Create a declaration to describe this forward declaration.
1860 ObjCInterfaceDecl *PrevIDecl
1861 = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
1862 ObjCInterfaceDecl *IDecl
1863 = ObjCInterfaceDecl::Create(Context, CurContext, AtClassLoc,
1864 IdentList[i], PrevIDecl, IdentLocs[i]);
1865 IDecl->setAtEndRange(IdentLocs[i]);
1867 PushOnScopeChains(IDecl, TUScope);
1868 CheckObjCDeclScope(IDecl);
1869 DeclsInGroup.push_back(IDecl);
1872 return BuildDeclaratorGroup(DeclsInGroup.data(), DeclsInGroup.size(), false);
1875 static bool tryMatchRecordTypes(ASTContext &Context,
1876 Sema::MethodMatchStrategy strategy,
1877 const Type *left, const Type *right);
1879 static bool matchTypes(ASTContext &Context, Sema::MethodMatchStrategy strategy,
1880 QualType leftQT, QualType rightQT) {
1882 Context.getCanonicalType(leftQT).getUnqualifiedType().getTypePtr();
1884 Context.getCanonicalType(rightQT).getUnqualifiedType().getTypePtr();
1886 if (left == right) return true;
1888 // If we're doing a strict match, the types have to match exactly.
1889 if (strategy == Sema::MMS_strict) return false;
1891 if (left->isIncompleteType() || right->isIncompleteType()) return false;
1893 // Otherwise, use this absurdly complicated algorithm to try to
1894 // validate the basic, low-level compatibility of the two types.
1896 // As a minimum, require the sizes and alignments to match.
1897 if (Context.getTypeInfo(left) != Context.getTypeInfo(right))
1900 // Consider all the kinds of non-dependent canonical types:
1901 // - functions and arrays aren't possible as return and parameter types
1903 // - vector types of equal size can be arbitrarily mixed
1904 if (isa<VectorType>(left)) return isa<VectorType>(right);
1905 if (isa<VectorType>(right)) return false;
1907 // - references should only match references of identical type
1908 // - structs, unions, and Objective-C objects must match more-or-less
1910 // - everything else should be a scalar
1911 if (!left->isScalarType() || !right->isScalarType())
1912 return tryMatchRecordTypes(Context, strategy, left, right);
1914 // Make scalars agree in kind, except count bools as chars, and group
1915 // all non-member pointers together.
1916 Type::ScalarTypeKind leftSK = left->getScalarTypeKind();
1917 Type::ScalarTypeKind rightSK = right->getScalarTypeKind();
1918 if (leftSK == Type::STK_Bool) leftSK = Type::STK_Integral;
1919 if (rightSK == Type::STK_Bool) rightSK = Type::STK_Integral;
1920 if (leftSK == Type::STK_CPointer || leftSK == Type::STK_BlockPointer)
1921 leftSK = Type::STK_ObjCObjectPointer;
1922 if (rightSK == Type::STK_CPointer || rightSK == Type::STK_BlockPointer)
1923 rightSK = Type::STK_ObjCObjectPointer;
1925 // Note that data member pointers and function member pointers don't
1926 // intermix because of the size differences.
1928 return (leftSK == rightSK);
1931 static bool tryMatchRecordTypes(ASTContext &Context,
1932 Sema::MethodMatchStrategy strategy,
1933 const Type *lt, const Type *rt) {
1934 assert(lt && rt && lt != rt);
1936 if (!isa<RecordType>(lt) || !isa<RecordType>(rt)) return false;
1937 RecordDecl *left = cast<RecordType>(lt)->getDecl();
1938 RecordDecl *right = cast<RecordType>(rt)->getDecl();
1940 // Require union-hood to match.
1941 if (left->isUnion() != right->isUnion()) return false;
1943 // Require an exact match if either is non-POD.
1944 if ((isa<CXXRecordDecl>(left) && !cast<CXXRecordDecl>(left)->isPOD()) ||
1945 (isa<CXXRecordDecl>(right) && !cast<CXXRecordDecl>(right)->isPOD()))
1948 // Require size and alignment to match.
1949 if (Context.getTypeInfo(lt) != Context.getTypeInfo(rt)) return false;
1951 // Require fields to match.
1952 RecordDecl::field_iterator li = left->field_begin(), le = left->field_end();
1953 RecordDecl::field_iterator ri = right->field_begin(), re = right->field_end();
1954 for (; li != le && ri != re; ++li, ++ri) {
1955 if (!matchTypes(Context, strategy, li->getType(), ri->getType()))
1958 return (li == le && ri == re);
1961 /// MatchTwoMethodDeclarations - Checks that two methods have matching type and
1962 /// returns true, or false, accordingly.
1963 /// TODO: Handle protocol list; such as id<p1,p2> in type comparisons
1964 bool Sema::MatchTwoMethodDeclarations(const ObjCMethodDecl *left,
1965 const ObjCMethodDecl *right,
1966 MethodMatchStrategy strategy) {
1967 if (!matchTypes(Context, strategy,
1968 left->getResultType(), right->getResultType()))
1971 if (getLangOpts().ObjCAutoRefCount &&
1972 (left->hasAttr<NSReturnsRetainedAttr>()
1973 != right->hasAttr<NSReturnsRetainedAttr>() ||
1974 left->hasAttr<NSConsumesSelfAttr>()
1975 != right->hasAttr<NSConsumesSelfAttr>()))
1978 ObjCMethodDecl::param_const_iterator
1979 li = left->param_begin(), le = left->param_end(), ri = right->param_begin(),
1980 re = right->param_end();
1982 for (; li != le && ri != re; ++li, ++ri) {
1983 assert(ri != right->param_end() && "Param mismatch");
1984 const ParmVarDecl *lparm = *li, *rparm = *ri;
1986 if (!matchTypes(Context, strategy, lparm->getType(), rparm->getType()))
1989 if (getLangOpts().ObjCAutoRefCount &&
1990 lparm->hasAttr<NSConsumedAttr>() != rparm->hasAttr<NSConsumedAttr>())
1996 void Sema::addMethodToGlobalList(ObjCMethodList *List, ObjCMethodDecl *Method) {
1997 // If the list is empty, make it a singleton list.
1998 if (List->Method == 0) {
1999 List->Method = Method;
2004 // We've seen a method with this name, see if we have already seen this type
2006 ObjCMethodList *Previous = List;
2007 for (; List; Previous = List, List = List->Next) {
2008 if (!MatchTwoMethodDeclarations(Method, List->Method))
2011 ObjCMethodDecl *PrevObjCMethod = List->Method;
2013 // Propagate the 'defined' bit.
2014 if (Method->isDefined())
2015 PrevObjCMethod->setDefined(true);
2017 // If a method is deprecated, push it in the global pool.
2018 // This is used for better diagnostics.
2019 if (Method->isDeprecated()) {
2020 if (!PrevObjCMethod->isDeprecated())
2021 List->Method = Method;
2023 // If new method is unavailable, push it into global pool
2024 // unless previous one is deprecated.
2025 if (Method->isUnavailable()) {
2026 if (PrevObjCMethod->getAvailability() < AR_Deprecated)
2027 List->Method = Method;
2033 // We have a new signature for an existing method - add it.
2034 // This is extremely rare. Only 1% of Cocoa selectors are "overloaded".
2035 ObjCMethodList *Mem = BumpAlloc.Allocate<ObjCMethodList>();
2036 Previous->Next = new (Mem) ObjCMethodList(Method, 0);
2039 /// \brief Read the contents of the method pool for a given selector from
2040 /// external storage.
2041 void Sema::ReadMethodPool(Selector Sel) {
2042 assert(ExternalSource && "We need an external AST source");
2043 ExternalSource->ReadMethodPool(Sel);
2046 void Sema::AddMethodToGlobalPool(ObjCMethodDecl *Method, bool impl,
2048 // Ignore methods of invalid containers.
2049 if (cast<Decl>(Method->getDeclContext())->isInvalidDecl())
2053 ReadMethodPool(Method->getSelector());
2055 GlobalMethodPool::iterator Pos = MethodPool.find(Method->getSelector());
2056 if (Pos == MethodPool.end())
2057 Pos = MethodPool.insert(std::make_pair(Method->getSelector(),
2058 GlobalMethods())).first;
2060 Method->setDefined(impl);
2062 ObjCMethodList &Entry = instance ? Pos->second.first : Pos->second.second;
2063 addMethodToGlobalList(&Entry, Method);
2066 /// Determines if this is an "acceptable" loose mismatch in the global
2067 /// method pool. This exists mostly as a hack to get around certain
2068 /// global mismatches which we can't afford to make warnings / errors.
2069 /// Really, what we want is a way to take a method out of the global
2071 static bool isAcceptableMethodMismatch(ObjCMethodDecl *chosen,
2072 ObjCMethodDecl *other) {
2073 if (!chosen->isInstanceMethod())
2076 Selector sel = chosen->getSelector();
2077 if (!sel.isUnarySelector() || sel.getNameForSlot(0) != "length")
2080 // Don't complain about mismatches for -length if the method we
2081 // chose has an integral result type.
2082 return (chosen->getResultType()->isIntegerType());
2085 ObjCMethodDecl *Sema::LookupMethodInGlobalPool(Selector Sel, SourceRange R,
2086 bool receiverIdOrClass,
2087 bool warn, bool instance) {
2089 ReadMethodPool(Sel);
2091 GlobalMethodPool::iterator Pos = MethodPool.find(Sel);
2092 if (Pos == MethodPool.end())
2095 ObjCMethodList &MethList = instance ? Pos->second.first : Pos->second.second;
2097 if (warn && MethList.Method && MethList.Next) {
2098 bool issueDiagnostic = false, issueError = false;
2100 // We support a warning which complains about *any* difference in
2101 // method signature.
2102 bool strictSelectorMatch =
2103 (receiverIdOrClass && warn &&
2104 (Diags.getDiagnosticLevel(diag::warn_strict_multiple_method_decl,
2106 DiagnosticsEngine::Ignored));
2107 if (strictSelectorMatch)
2108 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) {
2109 if (!MatchTwoMethodDeclarations(MethList.Method, Next->Method,
2111 issueDiagnostic = true;
2116 // If we didn't see any strict differences, we won't see any loose
2117 // differences. In ARC, however, we also need to check for loose
2118 // mismatches, because most of them are errors.
2119 if (!strictSelectorMatch ||
2120 (issueDiagnostic && getLangOpts().ObjCAutoRefCount))
2121 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) {
2122 // This checks if the methods differ in type mismatch.
2123 if (!MatchTwoMethodDeclarations(MethList.Method, Next->Method,
2125 !isAcceptableMethodMismatch(MethList.Method, Next->Method)) {
2126 issueDiagnostic = true;
2127 if (getLangOpts().ObjCAutoRefCount)
2133 if (issueDiagnostic) {
2135 Diag(R.getBegin(), diag::err_arc_multiple_method_decl) << Sel << R;
2136 else if (strictSelectorMatch)
2137 Diag(R.getBegin(), diag::warn_strict_multiple_method_decl) << Sel << R;
2139 Diag(R.getBegin(), diag::warn_multiple_method_decl) << Sel << R;
2141 Diag(MethList.Method->getLocStart(),
2142 issueError ? diag::note_possibility : diag::note_using)
2143 << MethList.Method->getSourceRange();
2144 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next)
2145 Diag(Next->Method->getLocStart(), diag::note_also_found)
2146 << Next->Method->getSourceRange();
2149 return MethList.Method;
2152 ObjCMethodDecl *Sema::LookupImplementedMethodInGlobalPool(Selector Sel) {
2153 GlobalMethodPool::iterator Pos = MethodPool.find(Sel);
2154 if (Pos == MethodPool.end())
2157 GlobalMethods &Methods = Pos->second;
2159 if (Methods.first.Method && Methods.first.Method->isDefined())
2160 return Methods.first.Method;
2161 if (Methods.second.Method && Methods.second.Method->isDefined())
2162 return Methods.second.Method;
2166 /// DiagnoseDuplicateIvars -
2167 /// Check for duplicate ivars in the entire class at the start of
2168 /// \@implementation. This becomes necesssary because class extension can
2169 /// add ivars to a class in random order which will not be known until
2170 /// class's \@implementation is seen.
2171 void Sema::DiagnoseDuplicateIvars(ObjCInterfaceDecl *ID,
2172 ObjCInterfaceDecl *SID) {
2173 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(),
2174 IVE = ID->ivar_end(); IVI != IVE; ++IVI) {
2175 ObjCIvarDecl* Ivar = *IVI;
2176 if (Ivar->isInvalidDecl())
2178 if (IdentifierInfo *II = Ivar->getIdentifier()) {
2179 ObjCIvarDecl* prevIvar = SID->lookupInstanceVariable(II);
2181 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II;
2182 Diag(prevIvar->getLocation(), diag::note_previous_declaration);
2183 Ivar->setInvalidDecl();
2189 Sema::ObjCContainerKind Sema::getObjCContainerKind() const {
2190 switch (CurContext->getDeclKind()) {
2191 case Decl::ObjCInterface:
2192 return Sema::OCK_Interface;
2193 case Decl::ObjCProtocol:
2194 return Sema::OCK_Protocol;
2195 case Decl::ObjCCategory:
2196 if (dyn_cast<ObjCCategoryDecl>(CurContext)->IsClassExtension())
2197 return Sema::OCK_ClassExtension;
2199 return Sema::OCK_Category;
2200 case Decl::ObjCImplementation:
2201 return Sema::OCK_Implementation;
2202 case Decl::ObjCCategoryImpl:
2203 return Sema::OCK_CategoryImplementation;
2206 return Sema::OCK_None;
2210 // Note: For class/category implemenations, allMethods/allProperties is
2212 Decl *Sema::ActOnAtEnd(Scope *S, SourceRange AtEnd,
2213 Decl **allMethods, unsigned allNum,
2214 Decl **allProperties, unsigned pNum,
2215 DeclGroupPtrTy *allTUVars, unsigned tuvNum) {
2217 if (getObjCContainerKind() == Sema::OCK_None)
2220 assert(AtEnd.isValid() && "Invalid location for '@end'");
2222 ObjCContainerDecl *OCD = dyn_cast<ObjCContainerDecl>(CurContext);
2223 Decl *ClassDecl = cast<Decl>(OCD);
2225 bool isInterfaceDeclKind =
2226 isa<ObjCInterfaceDecl>(ClassDecl) || isa<ObjCCategoryDecl>(ClassDecl)
2227 || isa<ObjCProtocolDecl>(ClassDecl);
2228 bool checkIdenticalMethods = isa<ObjCImplementationDecl>(ClassDecl);
2230 // FIXME: Remove these and use the ObjCContainerDecl/DeclContext.
2231 llvm::DenseMap<Selector, const ObjCMethodDecl*> InsMap;
2232 llvm::DenseMap<Selector, const ObjCMethodDecl*> ClsMap;
2234 for (unsigned i = 0; i < allNum; i++ ) {
2235 ObjCMethodDecl *Method =
2236 cast_or_null<ObjCMethodDecl>(allMethods[i]);
2238 if (!Method) continue; // Already issued a diagnostic.
2239 if (Method->isInstanceMethod()) {
2240 /// Check for instance method of the same name with incompatible types
2241 const ObjCMethodDecl *&PrevMethod = InsMap[Method->getSelector()];
2242 bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod)
2244 if ((isInterfaceDeclKind && PrevMethod && !match)
2245 || (checkIdenticalMethods && match)) {
2246 Diag(Method->getLocation(), diag::err_duplicate_method_decl)
2247 << Method->getDeclName();
2248 Diag(PrevMethod->getLocation(), diag::note_previous_declaration);
2249 Method->setInvalidDecl();
2252 Method->setAsRedeclaration(PrevMethod);
2253 if (!Context.getSourceManager().isInSystemHeader(
2254 Method->getLocation()))
2255 Diag(Method->getLocation(), diag::warn_duplicate_method_decl)
2256 << Method->getDeclName();
2257 Diag(PrevMethod->getLocation(), diag::note_previous_declaration);
2259 InsMap[Method->getSelector()] = Method;
2260 /// The following allows us to typecheck messages to "id".
2261 AddInstanceMethodToGlobalPool(Method);
2264 /// Check for class method of the same name with incompatible types
2265 const ObjCMethodDecl *&PrevMethod = ClsMap[Method->getSelector()];
2266 bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod)
2268 if ((isInterfaceDeclKind && PrevMethod && !match)
2269 || (checkIdenticalMethods && match)) {
2270 Diag(Method->getLocation(), diag::err_duplicate_method_decl)
2271 << Method->getDeclName();
2272 Diag(PrevMethod->getLocation(), diag::note_previous_declaration);
2273 Method->setInvalidDecl();
2276 Method->setAsRedeclaration(PrevMethod);
2277 if (!Context.getSourceManager().isInSystemHeader(
2278 Method->getLocation()))
2279 Diag(Method->getLocation(), diag::warn_duplicate_method_decl)
2280 << Method->getDeclName();
2281 Diag(PrevMethod->getLocation(), diag::note_previous_declaration);
2283 ClsMap[Method->getSelector()] = Method;
2284 AddFactoryMethodToGlobalPool(Method);
2288 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl>(ClassDecl)) {
2289 // Compares properties declared in this class to those of its
2291 ComparePropertiesInBaseAndSuper(I);
2292 CompareProperties(I, I);
2293 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(ClassDecl)) {
2294 // Categories are used to extend the class by declaring new methods.
2295 // By the same token, they are also used to add new properties. No
2296 // need to compare the added property to those in the class.
2298 // Compare protocol properties with those in category
2299 CompareProperties(C, C);
2300 if (C->IsClassExtension()) {
2301 ObjCInterfaceDecl *CCPrimary = C->getClassInterface();
2302 DiagnoseClassExtensionDupMethods(C, CCPrimary);
2305 if (ObjCContainerDecl *CDecl = dyn_cast<ObjCContainerDecl>(ClassDecl)) {
2306 if (CDecl->getIdentifier())
2307 // ProcessPropertyDecl is responsible for diagnosing conflicts with any
2308 // user-defined setter/getter. It also synthesizes setter/getter methods
2309 // and adds them to the DeclContext and global method pools.
2310 for (ObjCContainerDecl::prop_iterator I = CDecl->prop_begin(),
2311 E = CDecl->prop_end();
2313 ProcessPropertyDecl(*I, CDecl);
2314 CDecl->setAtEndRange(AtEnd);
2316 if (ObjCImplementationDecl *IC=dyn_cast<ObjCImplementationDecl>(ClassDecl)) {
2317 IC->setAtEndRange(AtEnd);
2318 if (ObjCInterfaceDecl* IDecl = IC->getClassInterface()) {
2319 // Any property declared in a class extension might have user
2320 // declared setter or getter in current class extension or one
2321 // of the other class extensions. Mark them as synthesized as
2322 // property will be synthesized when property with same name is
2323 // seen in the @implementation.
2324 for (const ObjCCategoryDecl *ClsExtDecl =
2325 IDecl->getFirstClassExtension();
2326 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) {
2327 for (ObjCContainerDecl::prop_iterator I = ClsExtDecl->prop_begin(),
2328 E = ClsExtDecl->prop_end(); I != E; ++I) {
2329 ObjCPropertyDecl *Property = *I;
2330 // Skip over properties declared @dynamic
2331 if (const ObjCPropertyImplDecl *PIDecl
2332 = IC->FindPropertyImplDecl(Property->getIdentifier()))
2333 if (PIDecl->getPropertyImplementation()
2334 == ObjCPropertyImplDecl::Dynamic)
2337 for (const ObjCCategoryDecl *CExtDecl =
2338 IDecl->getFirstClassExtension();
2339 CExtDecl; CExtDecl = CExtDecl->getNextClassExtension()) {
2340 if (ObjCMethodDecl *GetterMethod =
2341 CExtDecl->getInstanceMethod(Property->getGetterName()))
2342 GetterMethod->setSynthesized(true);
2343 if (!Property->isReadOnly())
2344 if (ObjCMethodDecl *SetterMethod =
2345 CExtDecl->getInstanceMethod(Property->getSetterName()))
2346 SetterMethod->setSynthesized(true);
2350 ImplMethodsVsClassMethods(S, IC, IDecl);
2351 AtomicPropertySetterGetterRules(IC, IDecl);
2352 DiagnoseOwningPropertyGetterSynthesis(IC);
2354 bool HasRootClassAttr = IDecl->hasAttr<ObjCRootClassAttr>();
2355 if (IDecl->getSuperClass() == NULL) {
2356 // This class has no superclass, so check that it has been marked with
2357 // __attribute((objc_root_class)).
2358 if (!HasRootClassAttr) {
2359 SourceLocation DeclLoc(IDecl->getLocation());
2360 SourceLocation SuperClassLoc(PP.getLocForEndOfToken(DeclLoc));
2361 Diag(DeclLoc, diag::warn_objc_root_class_missing)
2362 << IDecl->getIdentifier();
2363 // See if NSObject is in the current scope, and if it is, suggest
2364 // adding " : NSObject " to the class declaration.
2365 NamedDecl *IF = LookupSingleName(TUScope,
2366 NSAPIObj->getNSClassId(NSAPI::ClassId_NSObject),
2367 DeclLoc, LookupOrdinaryName);
2368 ObjCInterfaceDecl *NSObjectDecl = dyn_cast_or_null<ObjCInterfaceDecl>(IF);
2369 if (NSObjectDecl && NSObjectDecl->getDefinition()) {
2370 Diag(SuperClassLoc, diag::note_objc_needs_superclass)
2371 << FixItHint::CreateInsertion(SuperClassLoc, " : NSObject ");
2373 Diag(SuperClassLoc, diag::note_objc_needs_superclass);
2376 } else if (HasRootClassAttr) {
2377 // Complain that only root classes may have this attribute.
2378 Diag(IDecl->getLocation(), diag::err_objc_root_class_subclass);
2381 if (LangOpts.ObjCRuntime.isNonFragile()) {
2382 while (IDecl->getSuperClass()) {
2383 DiagnoseDuplicateIvars(IDecl, IDecl->getSuperClass());
2384 IDecl = IDecl->getSuperClass();
2388 SetIvarInitializers(IC);
2389 } else if (ObjCCategoryImplDecl* CatImplClass =
2390 dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) {
2391 CatImplClass->setAtEndRange(AtEnd);
2393 // Find category interface decl and then check that all methods declared
2394 // in this interface are implemented in the category @implementation.
2395 if (ObjCInterfaceDecl* IDecl = CatImplClass->getClassInterface()) {
2396 for (ObjCCategoryDecl *Categories = IDecl->getCategoryList();
2397 Categories; Categories = Categories->getNextClassCategory()) {
2398 if (Categories->getIdentifier() == CatImplClass->getIdentifier()) {
2399 ImplMethodsVsClassMethods(S, CatImplClass, Categories);
2405 if (isInterfaceDeclKind) {
2406 // Reject invalid vardecls.
2407 for (unsigned i = 0; i != tuvNum; i++) {
2408 DeclGroupRef DG = allTUVars[i].getAsVal<DeclGroupRef>();
2409 for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I)
2410 if (VarDecl *VDecl = dyn_cast<VarDecl>(*I)) {
2411 if (!VDecl->hasExternalStorage())
2412 Diag(VDecl->getLocation(), diag::err_objc_var_decl_inclass);
2416 ActOnObjCContainerFinishDefinition();
2418 for (unsigned i = 0; i != tuvNum; i++) {
2419 DeclGroupRef DG = allTUVars[i].getAsVal<DeclGroupRef>();
2420 for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I)
2421 (*I)->setTopLevelDeclInObjCContainer();
2422 Consumer.HandleTopLevelDeclInObjCContainer(DG);
2425 ActOnDocumentableDecl(ClassDecl);
2430 /// CvtQTToAstBitMask - utility routine to produce an AST bitmask for
2431 /// objective-c's type qualifier from the parser version of the same info.
2432 static Decl::ObjCDeclQualifier
2433 CvtQTToAstBitMask(ObjCDeclSpec::ObjCDeclQualifier PQTVal) {
2434 return (Decl::ObjCDeclQualifier) (unsigned) PQTVal;
2438 bool containsInvalidMethodImplAttribute(ObjCMethodDecl *IMD,
2440 // If method is only declared in implementation (private method),
2441 // No need to issue any diagnostics on method definition with attributes.
2445 // method declared in interface has no attribute.
2446 // But implementation has attributes. This is invalid
2447 if (!IMD->hasAttrs())
2450 const AttrVec &D = IMD->getAttrs();
2451 if (D.size() != A.size())
2454 // attributes on method declaration and definition must match exactly.
2455 // Note that we have at most a couple of attributes on methods, so this
2456 // n*n search is good enough.
2457 for (AttrVec::const_iterator i = A.begin(), e = A.end(); i != e; ++i) {
2459 for (AttrVec::const_iterator i1 = D.begin(), e1 = D.end(); i1 != e1; ++i1) {
2460 if ((*i)->getKind() == (*i1)->getKind()) {
2471 /// \brief Check whether the declared result type of the given Objective-C
2472 /// method declaration is compatible with the method's class.
2474 static Sema::ResultTypeCompatibilityKind
2475 CheckRelatedResultTypeCompatibility(Sema &S, ObjCMethodDecl *Method,
2476 ObjCInterfaceDecl *CurrentClass) {
2477 QualType ResultType = Method->getResultType();
2479 // If an Objective-C method inherits its related result type, then its
2480 // declared result type must be compatible with its own class type. The
2481 // declared result type is compatible if:
2482 if (const ObjCObjectPointerType *ResultObjectType
2483 = ResultType->getAs<ObjCObjectPointerType>()) {
2484 // - it is id or qualified id, or
2485 if (ResultObjectType->isObjCIdType() ||
2486 ResultObjectType->isObjCQualifiedIdType())
2487 return Sema::RTC_Compatible;
2490 if (ObjCInterfaceDecl *ResultClass
2491 = ResultObjectType->getInterfaceDecl()) {
2492 // - it is the same as the method's class type, or
2493 if (declaresSameEntity(CurrentClass, ResultClass))
2494 return Sema::RTC_Compatible;
2496 // - it is a superclass of the method's class type
2497 if (ResultClass->isSuperClassOf(CurrentClass))
2498 return Sema::RTC_Compatible;
2501 // Any Objective-C pointer type might be acceptable for a protocol
2502 // method; we just don't know.
2503 return Sema::RTC_Unknown;
2507 return Sema::RTC_Incompatible;
2511 /// A helper class for searching for methods which a particular method
2513 class OverrideSearch {
2516 ObjCMethodDecl *Method;
2517 llvm::SmallPtrSet<ObjCMethodDecl*, 4> Overridden;
2521 OverrideSearch(Sema &S, ObjCMethodDecl *method) : S(S), Method(method) {
2522 Selector selector = method->getSelector();
2524 // Bypass this search if we've never seen an instance/class method
2525 // with this selector before.
2526 Sema::GlobalMethodPool::iterator it = S.MethodPool.find(selector);
2527 if (it == S.MethodPool.end()) {
2528 if (!S.ExternalSource) return;
2529 S.ReadMethodPool(selector);
2531 it = S.MethodPool.find(selector);
2532 if (it == S.MethodPool.end())
2535 ObjCMethodList &list =
2536 method->isInstanceMethod() ? it->second.first : it->second.second;
2537 if (!list.Method) return;
2539 ObjCContainerDecl *container
2540 = cast<ObjCContainerDecl>(method->getDeclContext());
2542 // Prevent the search from reaching this container again. This is
2543 // important with categories, which override methods from the
2544 // interface and each other.
2545 if (ObjCCategoryDecl *Category = dyn_cast<ObjCCategoryDecl>(container)) {
2546 searchFromContainer(container);
2547 if (ObjCInterfaceDecl *Interface = Category->getClassInterface())
2548 searchFromContainer(Interface);
2550 searchFromContainer(container);
2554 typedef llvm::SmallPtrSet<ObjCMethodDecl*, 128>::iterator iterator;
2555 iterator begin() const { return Overridden.begin(); }
2556 iterator end() const { return Overridden.end(); }
2559 void searchFromContainer(ObjCContainerDecl *container) {
2560 if (container->isInvalidDecl()) return;
2562 switch (container->getDeclKind()) {
2563 #define OBJCCONTAINER(type, base) \
2565 searchFrom(cast<type##Decl>(container)); \
2567 #define ABSTRACT_DECL(expansion)
2568 #define DECL(type, base) \
2570 #include "clang/AST/DeclNodes.inc"
2571 llvm_unreachable("not an ObjC container!");
2575 void searchFrom(ObjCProtocolDecl *protocol) {
2576 if (!protocol->hasDefinition())
2579 // A method in a protocol declaration overrides declarations from
2580 // referenced ("parent") protocols.
2581 search(protocol->getReferencedProtocols());
2584 void searchFrom(ObjCCategoryDecl *category) {
2585 // A method in a category declaration overrides declarations from
2586 // the main class and from protocols the category references.
2587 // The main class is handled in the constructor.
2588 search(category->getReferencedProtocols());
2591 void searchFrom(ObjCCategoryImplDecl *impl) {
2592 // A method in a category definition that has a category
2593 // declaration overrides declarations from the category
2595 if (ObjCCategoryDecl *category = impl->getCategoryDecl()) {
2597 if (ObjCInterfaceDecl *Interface = category->getClassInterface())
2600 // Otherwise it overrides declarations from the class.
2601 } else if (ObjCInterfaceDecl *Interface = impl->getClassInterface()) {
2606 void searchFrom(ObjCInterfaceDecl *iface) {
2607 // A method in a class declaration overrides declarations from
2608 if (!iface->hasDefinition())
2612 for (ObjCCategoryDecl *category = iface->getCategoryList();
2613 category; category = category->getNextClassCategory())
2616 // - the super class, and
2617 if (ObjCInterfaceDecl *super = iface->getSuperClass())
2620 // - any referenced protocols.
2621 search(iface->getReferencedProtocols());
2624 void searchFrom(ObjCImplementationDecl *impl) {
2625 // A method in a class implementation overrides declarations from
2626 // the class interface.
2627 if (ObjCInterfaceDecl *Interface = impl->getClassInterface())
2632 void search(const ObjCProtocolList &protocols) {
2633 for (ObjCProtocolList::iterator i = protocols.begin(), e = protocols.end();
2638 void search(ObjCContainerDecl *container) {
2639 // Check for a method in this container which matches this selector.
2640 ObjCMethodDecl *meth = container->getMethod(Method->getSelector(),
2641 Method->isInstanceMethod());
2643 // If we find one, record it and bail out.
2645 Overridden.insert(meth);
2649 // Otherwise, search for methods that a hypothetical method here
2650 // would have overridden.
2652 // Note that we're now in a recursive case.
2655 searchFromContainer(container);
2660 void Sema::CheckObjCMethodOverrides(ObjCMethodDecl *ObjCMethod,
2661 ObjCInterfaceDecl *CurrentClass,
2662 ResultTypeCompatibilityKind RTC) {
2663 // Search for overridden methods and merge information down from them.
2664 OverrideSearch overrides(*this, ObjCMethod);
2665 // Keep track if the method overrides any method in the class's base classes,
2666 // its protocols, or its categories' protocols; we will keep that info
2667 // in the ObjCMethodDecl.
2668 // For this info, a method in an implementation is not considered as
2669 // overriding the same method in the interface or its categories.
2670 bool hasOverriddenMethodsInBaseOrProtocol = false;
2671 for (OverrideSearch::iterator
2672 i = overrides.begin(), e = overrides.end(); i != e; ++i) {
2673 ObjCMethodDecl *overridden = *i;
2675 if (isa<ObjCProtocolDecl>(overridden->getDeclContext()) ||
2676 CurrentClass != overridden->getClassInterface() ||
2677 overridden->isOverriding())
2678 hasOverriddenMethodsInBaseOrProtocol = true;
2680 // Propagate down the 'related result type' bit from overridden methods.
2681 if (RTC != Sema::RTC_Incompatible && overridden->hasRelatedResultType())
2682 ObjCMethod->SetRelatedResultType();
2684 // Then merge the declarations.
2685 mergeObjCMethodDecls(ObjCMethod, overridden);
2687 if (ObjCMethod->isImplicit() && overridden->isImplicit())
2688 continue; // Conflicting properties are detected elsewhere.
2690 // Check for overriding methods
2691 if (isa<ObjCInterfaceDecl>(ObjCMethod->getDeclContext()) ||
2692 isa<ObjCImplementationDecl>(ObjCMethod->getDeclContext()))
2693 CheckConflictingOverridingMethod(ObjCMethod, overridden,
2694 isa<ObjCProtocolDecl>(overridden->getDeclContext()));
2696 if (CurrentClass && overridden->getDeclContext() != CurrentClass &&
2697 isa<ObjCInterfaceDecl>(overridden->getDeclContext()) &&
2698 !overridden->isImplicit() /* not meant for properties */) {
2699 ObjCMethodDecl::param_iterator ParamI = ObjCMethod->param_begin(),
2700 E = ObjCMethod->param_end();
2701 ObjCMethodDecl::param_iterator PrevI = overridden->param_begin(),
2702 PrevE = overridden->param_end();
2703 for (; ParamI != E && PrevI != PrevE; ++ParamI, ++PrevI) {
2704 assert(PrevI != overridden->param_end() && "Param mismatch");
2705 QualType T1 = Context.getCanonicalType((*ParamI)->getType());
2706 QualType T2 = Context.getCanonicalType((*PrevI)->getType());
2707 // If type of argument of method in this class does not match its
2708 // respective argument type in the super class method, issue warning;
2709 if (!Context.typesAreCompatible(T1, T2)) {
2710 Diag((*ParamI)->getLocation(), diag::ext_typecheck_base_super)
2712 Diag(overridden->getLocation(), diag::note_previous_declaration);
2719 ObjCMethod->setOverriding(hasOverriddenMethodsInBaseOrProtocol);
2722 Decl *Sema::ActOnMethodDeclaration(
2724 SourceLocation MethodLoc, SourceLocation EndLoc,
2725 tok::TokenKind MethodType,
2726 ObjCDeclSpec &ReturnQT, ParsedType ReturnType,
2727 ArrayRef<SourceLocation> SelectorLocs,
2729 // optional arguments. The number of types/arguments is obtained
2730 // from the Sel.getNumArgs().
2731 ObjCArgInfo *ArgInfo,
2732 DeclaratorChunk::ParamInfo *CParamInfo, unsigned CNumArgs, // c-style args
2733 AttributeList *AttrList, tok::ObjCKeywordKind MethodDeclKind,
2734 bool isVariadic, bool MethodDefinition) {
2735 // Make sure we can establish a context for the method.
2736 if (!CurContext->isObjCContainer()) {
2737 Diag(MethodLoc, diag::error_missing_method_context);
2740 ObjCContainerDecl *OCD = dyn_cast<ObjCContainerDecl>(CurContext);
2741 Decl *ClassDecl = cast<Decl>(OCD);
2742 QualType resultDeclType;
2744 bool HasRelatedResultType = false;
2745 TypeSourceInfo *ResultTInfo = 0;
2747 resultDeclType = GetTypeFromParser(ReturnType, &ResultTInfo);
2749 // Methods cannot return interface types. All ObjC objects are
2750 // passed by reference.
2751 if (resultDeclType->isObjCObjectType()) {
2752 Diag(MethodLoc, diag::err_object_cannot_be_passed_returned_by_value)
2753 << 0 << resultDeclType;
2757 HasRelatedResultType = (resultDeclType == Context.getObjCInstanceType());
2758 } else { // get the type for "id".
2759 resultDeclType = Context.getObjCIdType();
2760 Diag(MethodLoc, diag::warn_missing_method_return_type)
2761 << FixItHint::CreateInsertion(SelectorLocs.front(), "(id)");
2764 ObjCMethodDecl* ObjCMethod =
2765 ObjCMethodDecl::Create(Context, MethodLoc, EndLoc, Sel,
2769 MethodType == tok::minus, isVariadic,
2770 /*isSynthesized=*/false,
2771 /*isImplicitlyDeclared=*/false, /*isDefined=*/false,
2772 MethodDeclKind == tok::objc_optional
2773 ? ObjCMethodDecl::Optional
2774 : ObjCMethodDecl::Required,
2775 HasRelatedResultType);
2777 SmallVector<ParmVarDecl*, 16> Params;
2779 for (unsigned i = 0, e = Sel.getNumArgs(); i != e; ++i) {
2783 if (ArgInfo[i].Type == 0) {
2784 ArgType = Context.getObjCIdType();
2787 ArgType = GetTypeFromParser(ArgInfo[i].Type, &DI);
2788 // Perform the default array/function conversions (C99 6.7.5.3p[7,8]).
2789 ArgType = Context.getAdjustedParameterType(ArgType);
2792 LookupResult R(*this, ArgInfo[i].Name, ArgInfo[i].NameLoc,
2793 LookupOrdinaryName, ForRedeclaration);
2795 if (R.isSingleResult()) {
2796 NamedDecl *PrevDecl = R.getFoundDecl();
2797 if (S->isDeclScope(PrevDecl)) {
2798 Diag(ArgInfo[i].NameLoc,
2799 (MethodDefinition ? diag::warn_method_param_redefinition
2800 : diag::warn_method_param_declaration))
2802 Diag(PrevDecl->getLocation(),
2803 diag::note_previous_declaration);
2807 SourceLocation StartLoc = DI
2808 ? DI->getTypeLoc().getBeginLoc()
2809 : ArgInfo[i].NameLoc;
2811 ParmVarDecl* Param = CheckParameter(ObjCMethod, StartLoc,
2812 ArgInfo[i].NameLoc, ArgInfo[i].Name,
2813 ArgType, DI, SC_None, SC_None);
2815 Param->setObjCMethodScopeInfo(i);
2817 Param->setObjCDeclQualifier(
2818 CvtQTToAstBitMask(ArgInfo[i].DeclSpec.getObjCDeclQualifier()));
2820 // Apply the attributes to the parameter.
2821 ProcessDeclAttributeList(TUScope, Param, ArgInfo[i].ArgAttrs);
2823 if (Param->hasAttr<BlocksAttr>()) {
2824 Diag(Param->getLocation(), diag::err_block_on_nonlocal);
2825 Param->setInvalidDecl();
2828 IdResolver.AddDecl(Param);
2830 Params.push_back(Param);
2833 for (unsigned i = 0, e = CNumArgs; i != e; ++i) {
2834 ParmVarDecl *Param = cast<ParmVarDecl>(CParamInfo[i].Param);
2835 QualType ArgType = Param->getType();
2836 if (ArgType.isNull())
2837 ArgType = Context.getObjCIdType();
2839 // Perform the default array/function conversions (C99 6.7.5.3p[7,8]).
2840 ArgType = Context.getAdjustedParameterType(ArgType);
2841 if (ArgType->isObjCObjectType()) {
2842 Diag(Param->getLocation(),
2843 diag::err_object_cannot_be_passed_returned_by_value)
2845 Param->setInvalidDecl();
2847 Param->setDeclContext(ObjCMethod);
2849 Params.push_back(Param);
2852 ObjCMethod->setMethodParams(Context, Params, SelectorLocs);
2853 ObjCMethod->setObjCDeclQualifier(
2854 CvtQTToAstBitMask(ReturnQT.getObjCDeclQualifier()));
2857 ProcessDeclAttributeList(TUScope, ObjCMethod, AttrList);
2859 // Add the method now.
2860 const ObjCMethodDecl *PrevMethod = 0;
2861 if (ObjCImplDecl *ImpDecl = dyn_cast<ObjCImplDecl>(ClassDecl)) {
2862 if (MethodType == tok::minus) {
2863 PrevMethod = ImpDecl->getInstanceMethod(Sel);
2864 ImpDecl->addInstanceMethod(ObjCMethod);
2866 PrevMethod = ImpDecl->getClassMethod(Sel);
2867 ImpDecl->addClassMethod(ObjCMethod);
2870 ObjCMethodDecl *IMD = 0;
2871 if (ObjCInterfaceDecl *IDecl = ImpDecl->getClassInterface())
2872 IMD = IDecl->lookupMethod(ObjCMethod->getSelector(),
2873 ObjCMethod->isInstanceMethod());
2874 if (ObjCMethod->hasAttrs() &&
2875 containsInvalidMethodImplAttribute(IMD, ObjCMethod->getAttrs())) {
2876 SourceLocation MethodLoc = IMD->getLocation();
2877 if (!getSourceManager().isInSystemHeader(MethodLoc)) {
2878 Diag(EndLoc, diag::warn_attribute_method_def);
2879 Diag(MethodLoc, diag::note_method_declared_at)
2880 << ObjCMethod->getDeclName();
2884 cast<DeclContext>(ClassDecl)->addDecl(ObjCMethod);
2888 // You can never have two method definitions with the same name.
2889 Diag(ObjCMethod->getLocation(), diag::err_duplicate_method_decl)
2890 << ObjCMethod->getDeclName();
2891 Diag(PrevMethod->getLocation(), diag::note_previous_declaration);
2894 // If this Objective-C method does not have a related result type, but we
2895 // are allowed to infer related result types, try to do so based on the
2897 ObjCInterfaceDecl *CurrentClass = dyn_cast<ObjCInterfaceDecl>(ClassDecl);
2898 if (!CurrentClass) {
2899 if (ObjCCategoryDecl *Cat = dyn_cast<ObjCCategoryDecl>(ClassDecl))
2900 CurrentClass = Cat->getClassInterface();
2901 else if (ObjCImplDecl *Impl = dyn_cast<ObjCImplDecl>(ClassDecl))
2902 CurrentClass = Impl->getClassInterface();
2903 else if (ObjCCategoryImplDecl *CatImpl
2904 = dyn_cast<ObjCCategoryImplDecl>(ClassDecl))
2905 CurrentClass = CatImpl->getClassInterface();
2908 ResultTypeCompatibilityKind RTC
2909 = CheckRelatedResultTypeCompatibility(*this, ObjCMethod, CurrentClass);
2911 CheckObjCMethodOverrides(ObjCMethod, CurrentClass, RTC);
2913 bool ARCError = false;
2914 if (getLangOpts().ObjCAutoRefCount)
2915 ARCError = CheckARCMethodDecl(*this, ObjCMethod);
2917 // Infer the related result type when possible.
2918 if (!ARCError && RTC == Sema::RTC_Compatible &&
2919 !ObjCMethod->hasRelatedResultType() &&
2920 LangOpts.ObjCInferRelatedResultType) {
2921 bool InferRelatedResultType = false;
2922 switch (ObjCMethod->getMethodFamily()) {
2927 case OMF_mutableCopy:
2929 case OMF_retainCount:
2930 case OMF_performSelector:
2935 InferRelatedResultType = ObjCMethod->isClassMethod();
2939 case OMF_autorelease:
2942 InferRelatedResultType = ObjCMethod->isInstanceMethod();
2946 if (InferRelatedResultType)
2947 ObjCMethod->SetRelatedResultType();
2950 ActOnDocumentableDecl(ObjCMethod);
2955 bool Sema::CheckObjCDeclScope(Decl *D) {
2956 // Following is also an error. But it is caused by a missing @end
2957 // and diagnostic is issued elsewhere.
2958 if (isa<ObjCContainerDecl>(CurContext->getRedeclContext()))
2961 // If we switched context to translation unit while we are still lexically in
2962 // an objc container, it means the parser missed emitting an error.
2963 if (isa<TranslationUnitDecl>(getCurLexicalContext()->getRedeclContext()))
2966 Diag(D->getLocation(), diag::err_objc_decls_may_only_appear_in_global_scope);
2967 D->setInvalidDecl();
2972 /// Called whenever \@defs(ClassName) is encountered in the source. Inserts the
2973 /// instance variables of ClassName into Decls.
2974 void Sema::ActOnDefs(Scope *S, Decl *TagD, SourceLocation DeclStart,
2975 IdentifierInfo *ClassName,
2976 SmallVectorImpl<Decl*> &Decls) {
2977 // Check that ClassName is a valid class
2978 ObjCInterfaceDecl *Class = getObjCInterfaceDecl(ClassName, DeclStart);
2980 Diag(DeclStart, diag::err_undef_interface) << ClassName;
2983 if (LangOpts.ObjCRuntime.isNonFragile()) {
2984 Diag(DeclStart, diag::err_atdef_nonfragile_interface);
2988 // Collect the instance variables
2989 SmallVector<const ObjCIvarDecl*, 32> Ivars;
2990 Context.DeepCollectObjCIvars(Class, true, Ivars);
2991 // For each ivar, create a fresh ObjCAtDefsFieldDecl.
2992 for (unsigned i = 0; i < Ivars.size(); i++) {
2993 const FieldDecl* ID = cast<FieldDecl>(Ivars[i]);
2994 RecordDecl *Record = dyn_cast<RecordDecl>(TagD);
2995 Decl *FD = ObjCAtDefsFieldDecl::Create(Context, Record,
2996 /*FIXME: StartL=*/ID->getLocation(),
2998 ID->getIdentifier(), ID->getType(),
3000 Decls.push_back(FD);
3003 // Introduce all of these fields into the appropriate scope.
3004 for (SmallVectorImpl<Decl*>::iterator D = Decls.begin();
3005 D != Decls.end(); ++D) {
3006 FieldDecl *FD = cast<FieldDecl>(*D);
3007 if (getLangOpts().CPlusPlus)
3008 PushOnScopeChains(cast<FieldDecl>(FD), S);
3009 else if (RecordDecl *Record = dyn_cast<RecordDecl>(TagD))
3010 Record->addDecl(FD);
3014 /// \brief Build a type-check a new Objective-C exception variable declaration.
3015 VarDecl *Sema::BuildObjCExceptionDecl(TypeSourceInfo *TInfo, QualType T,
3016 SourceLocation StartLoc,
3017 SourceLocation IdLoc,
3020 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage
3021 // duration shall not be qualified by an address-space qualifier."
3022 // Since all parameters have automatic store duration, they can not have
3023 // an address space.
3024 if (T.getAddressSpace() != 0) {
3025 Diag(IdLoc, diag::err_arg_with_address_space);
3029 // An @catch parameter must be an unqualified object pointer type;
3030 // FIXME: Recover from "NSObject foo" by inserting the * in "NSObject *foo"?
3032 // Don't do any further checking.
3033 } else if (T->isDependentType()) {
3034 // Okay: we don't know what this type will instantiate to.
3035 } else if (!T->isObjCObjectPointerType()) {
3037 Diag(IdLoc ,diag::err_catch_param_not_objc_type);
3038 } else if (T->isObjCQualifiedIdType()) {
3040 Diag(IdLoc, diag::err_illegal_qualifiers_on_catch_parm);
3043 VarDecl *New = VarDecl::Create(Context, CurContext, StartLoc, IdLoc, Id,
3044 T, TInfo, SC_None, SC_None);
3045 New->setExceptionVariable(true);
3047 // In ARC, infer 'retaining' for variables of retainable type.
3048 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(New))
3052 New->setInvalidDecl();
3056 Decl *Sema::ActOnObjCExceptionDecl(Scope *S, Declarator &D) {
3057 const DeclSpec &DS = D.getDeclSpec();
3059 // We allow the "register" storage class on exception variables because
3060 // GCC did, but we drop it completely. Any other storage class is an error.
3061 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) {
3062 Diag(DS.getStorageClassSpecLoc(), diag::warn_register_objc_catch_parm)
3063 << FixItHint::CreateRemoval(SourceRange(DS.getStorageClassSpecLoc()));
3064 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) {
3065 Diag(DS.getStorageClassSpecLoc(), diag::err_storage_spec_on_catch_parm)
3066 << DS.getStorageClassSpec();
3068 if (D.getDeclSpec().isThreadSpecified())
3069 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
3070 D.getMutableDeclSpec().ClearStorageClassSpecs();
3072 DiagnoseFunctionSpecifiers(D);
3074 // Check that there are no default arguments inside the type of this
3075 // exception object (C++ only).
3076 if (getLangOpts().CPlusPlus)
3077 CheckExtraCXXDefaultArguments(D);
3079 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
3080 QualType ExceptionType = TInfo->getType();
3082 VarDecl *New = BuildObjCExceptionDecl(TInfo, ExceptionType,
3083 D.getSourceRange().getBegin(),
3084 D.getIdentifierLoc(),
3088 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1).
3089 if (D.getCXXScopeSpec().isSet()) {
3090 Diag(D.getIdentifierLoc(), diag::err_qualified_objc_catch_parm)
3091 << D.getCXXScopeSpec().getRange();
3092 New->setInvalidDecl();
3095 // Add the parameter declaration into this scope.
3097 if (D.getIdentifier())
3098 IdResolver.AddDecl(New);
3100 ProcessDeclAttributes(S, New, D);
3102 if (New->hasAttr<BlocksAttr>())
3103 Diag(New->getLocation(), diag::err_block_on_nonlocal);
3107 /// CollectIvarsToConstructOrDestruct - Collect those ivars which require
3109 void Sema::CollectIvarsToConstructOrDestruct(ObjCInterfaceDecl *OI,
3110 SmallVectorImpl<ObjCIvarDecl*> &Ivars) {
3111 for (ObjCIvarDecl *Iv = OI->all_declared_ivar_begin(); Iv;
3112 Iv= Iv->getNextIvar()) {
3113 QualType QT = Context.getBaseElementType(Iv->getType());
3114 if (QT->isRecordType())
3115 Ivars.push_back(Iv);
3119 void Sema::DiagnoseUseOfUnimplementedSelectors() {
3120 // Load referenced selectors from the external source.
3121 if (ExternalSource) {
3122 SmallVector<std::pair<Selector, SourceLocation>, 4> Sels;
3123 ExternalSource->ReadReferencedSelectors(Sels);
3124 for (unsigned I = 0, N = Sels.size(); I != N; ++I)
3125 ReferencedSelectors[Sels[I].first] = Sels[I].second;
3128 // Warning will be issued only when selector table is
3129 // generated (which means there is at lease one implementation
3130 // in the TU). This is to match gcc's behavior.
3131 if (ReferencedSelectors.empty() ||
3132 !Context.AnyObjCImplementation())
3134 for (llvm::DenseMap<Selector, SourceLocation>::iterator S =
3135 ReferencedSelectors.begin(),
3136 E = ReferencedSelectors.end(); S != E; ++S) {
3137 Selector Sel = (*S).first;
3138 if (!LookupImplementedMethodInGlobalPool(Sel))
3139 Diag((*S).second, diag::warn_unimplemented_selector) << Sel;