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 /// HasExplicitOwnershipAttr - returns true when pointer to ObjC pointer
286 /// has explicit ownership attribute; false otherwise.
288 HasExplicitOwnershipAttr(Sema &S, ParmVarDecl *Param) {
289 QualType T = Param->getType();
291 if (const PointerType *PT = T->getAs<PointerType>()) {
292 T = PT->getPointeeType();
293 } else if (const ReferenceType *RT = T->getAs<ReferenceType>()) {
294 T = RT->getPointeeType();
299 // If we have a lifetime qualifier, but it's local, we must have
300 // inferred it. So, it is implicit.
301 return !T.getLocalQualifiers().hasObjCLifetime();
304 /// ActOnStartOfObjCMethodDef - This routine sets up parameters; invisible
305 /// and user declared, in the method definition's AST.
306 void Sema::ActOnStartOfObjCMethodDef(Scope *FnBodyScope, Decl *D) {
307 assert((getCurMethodDecl() == 0) && "Methodparsing confused");
308 ObjCMethodDecl *MDecl = dyn_cast_or_null<ObjCMethodDecl>(D);
310 // If we don't have a valid method decl, simply return.
314 // Allow all of Sema to see that we are entering a method definition.
315 PushDeclContext(FnBodyScope, MDecl);
318 // Create Decl objects for each parameter, entrring them in the scope for
319 // binding to their use.
321 // Insert the invisible arguments, self and _cmd!
322 MDecl->createImplicitParams(Context, MDecl->getClassInterface());
324 PushOnScopeChains(MDecl->getSelfDecl(), FnBodyScope);
325 PushOnScopeChains(MDecl->getCmdDecl(), FnBodyScope);
327 // Introduce all of the other parameters into this scope.
328 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(),
329 E = MDecl->param_end(); PI != E; ++PI) {
330 ParmVarDecl *Param = (*PI);
331 if (!Param->isInvalidDecl() &&
332 RequireCompleteType(Param->getLocation(), Param->getType(),
333 diag::err_typecheck_decl_incomplete_type))
334 Param->setInvalidDecl();
335 if (!Param->isInvalidDecl() &&
336 getLangOpts().ObjCAutoRefCount &&
337 !HasExplicitOwnershipAttr(*this, Param))
338 Diag(Param->getLocation(), diag::warn_arc_strong_pointer_objc_pointer) <<
341 if ((*PI)->getIdentifier())
342 PushOnScopeChains(*PI, FnBodyScope);
345 // In ARC, disallow definition of retain/release/autorelease/retainCount
346 if (getLangOpts().ObjCAutoRefCount) {
347 switch (MDecl->getMethodFamily()) {
349 case OMF_retainCount:
351 case OMF_autorelease:
352 Diag(MDecl->getLocation(), diag::err_arc_illegal_method_def)
353 << MDecl->getSelector();
361 case OMF_mutableCopy:
365 case OMF_performSelector:
370 // Warn on deprecated methods under -Wdeprecated-implementations,
371 // and prepare for warning on missing super calls.
372 if (ObjCInterfaceDecl *IC = MDecl->getClassInterface()) {
373 ObjCMethodDecl *IMD =
374 IC->lookupMethod(MDecl->getSelector(), MDecl->isInstanceMethod());
377 DiagnoseObjCImplementedDeprecations(*this,
378 dyn_cast<NamedDecl>(IMD),
379 MDecl->getLocation(), 0);
381 // If this is "dealloc" or "finalize", set some bit here.
382 // Then in ActOnSuperMessage() (SemaExprObjC), set it back to false.
383 // Finally, in ActOnFinishFunctionBody() (SemaDecl), warn if flag is set.
384 // Only do this if the current class actually has a superclass.
385 if (IC->getSuperClass()) {
386 ObjCMethodFamily Family = MDecl->getMethodFamily();
387 if (Family == OMF_dealloc) {
388 if (!(getLangOpts().ObjCAutoRefCount ||
389 getLangOpts().getGC() == LangOptions::GCOnly))
390 getCurFunction()->ObjCShouldCallSuper = true;
392 } else if (Family == OMF_finalize) {
393 if (Context.getLangOpts().getGC() != LangOptions::NonGC)
394 getCurFunction()->ObjCShouldCallSuper = true;
397 const ObjCMethodDecl *SuperMethod =
398 IC->getSuperClass()->lookupMethod(MDecl->getSelector(),
399 MDecl->isInstanceMethod());
400 getCurFunction()->ObjCShouldCallSuper =
401 (SuperMethod && SuperMethod->hasAttr<ObjCRequiresSuperAttr>());
409 // Callback to only accept typo corrections that are Objective-C classes.
410 // If an ObjCInterfaceDecl* is given to the constructor, then the validation
411 // function will reject corrections to that class.
412 class ObjCInterfaceValidatorCCC : public CorrectionCandidateCallback {
414 ObjCInterfaceValidatorCCC() : CurrentIDecl(0) {}
415 explicit ObjCInterfaceValidatorCCC(ObjCInterfaceDecl *IDecl)
416 : CurrentIDecl(IDecl) {}
418 virtual bool ValidateCandidate(const TypoCorrection &candidate) {
419 ObjCInterfaceDecl *ID = candidate.getCorrectionDeclAs<ObjCInterfaceDecl>();
420 return ID && !declaresSameEntity(ID, CurrentIDecl);
424 ObjCInterfaceDecl *CurrentIDecl;
430 ActOnStartClassInterface(SourceLocation AtInterfaceLoc,
431 IdentifierInfo *ClassName, SourceLocation ClassLoc,
432 IdentifierInfo *SuperName, SourceLocation SuperLoc,
433 Decl * const *ProtoRefs, unsigned NumProtoRefs,
434 const SourceLocation *ProtoLocs,
435 SourceLocation EndProtoLoc, AttributeList *AttrList) {
436 assert(ClassName && "Missing class identifier");
438 // Check for another declaration kind with the same name.
439 NamedDecl *PrevDecl = LookupSingleName(TUScope, ClassName, ClassLoc,
440 LookupOrdinaryName, ForRedeclaration);
442 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
443 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName;
444 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
447 // Create a declaration to describe this @interface.
448 ObjCInterfaceDecl* PrevIDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
449 ObjCInterfaceDecl *IDecl
450 = ObjCInterfaceDecl::Create(Context, CurContext, AtInterfaceLoc, ClassName,
451 PrevIDecl, ClassLoc);
454 // Class already seen. Was it a definition?
455 if (ObjCInterfaceDecl *Def = PrevIDecl->getDefinition()) {
456 Diag(AtInterfaceLoc, diag::err_duplicate_class_def)
457 << PrevIDecl->getDeclName();
458 Diag(Def->getLocation(), diag::note_previous_definition);
459 IDecl->setInvalidDecl();
464 ProcessDeclAttributeList(TUScope, IDecl, AttrList);
465 PushOnScopeChains(IDecl, TUScope);
467 // Start the definition of this class. If we're in a redefinition case, there
468 // may already be a definition, so we'll end up adding to it.
469 if (!IDecl->hasDefinition())
470 IDecl->startDefinition();
473 // Check if a different kind of symbol declared in this scope.
474 PrevDecl = LookupSingleName(TUScope, SuperName, SuperLoc,
478 // Try to correct for a typo in the superclass name without correcting
479 // to the class we're defining.
480 ObjCInterfaceValidatorCCC Validator(IDecl);
481 if (TypoCorrection Corrected = CorrectTypo(
482 DeclarationNameInfo(SuperName, SuperLoc), LookupOrdinaryName, TUScope,
484 PrevDecl = Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>();
485 Diag(SuperLoc, diag::err_undef_superclass_suggest)
486 << SuperName << ClassName << PrevDecl->getDeclName();
487 Diag(PrevDecl->getLocation(), diag::note_previous_decl)
488 << PrevDecl->getDeclName();
492 if (declaresSameEntity(PrevDecl, IDecl)) {
493 Diag(SuperLoc, diag::err_recursive_superclass)
494 << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc);
495 IDecl->setEndOfDefinitionLoc(ClassLoc);
497 ObjCInterfaceDecl *SuperClassDecl =
498 dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
500 // Diagnose classes that inherit from deprecated classes.
502 (void)DiagnoseUseOfDecl(SuperClassDecl, SuperLoc);
504 if (PrevDecl && SuperClassDecl == 0) {
505 // The previous declaration was not a class decl. Check if we have a
506 // typedef. If we do, get the underlying class type.
507 if (const TypedefNameDecl *TDecl =
508 dyn_cast_or_null<TypedefNameDecl>(PrevDecl)) {
509 QualType T = TDecl->getUnderlyingType();
510 if (T->isObjCObjectType()) {
511 if (NamedDecl *IDecl = T->getAs<ObjCObjectType>()->getInterface())
512 SuperClassDecl = dyn_cast<ObjCInterfaceDecl>(IDecl);
516 // This handles the following case:
518 // typedef int SuperClass;
519 // @interface MyClass : SuperClass {} @end
521 if (!SuperClassDecl) {
522 Diag(SuperLoc, diag::err_redefinition_different_kind) << SuperName;
523 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
527 if (!dyn_cast_or_null<TypedefNameDecl>(PrevDecl)) {
529 Diag(SuperLoc, diag::err_undef_superclass)
530 << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc);
531 else if (RequireCompleteType(SuperLoc,
532 Context.getObjCInterfaceType(SuperClassDecl),
533 diag::err_forward_superclass,
534 SuperClassDecl->getDeclName(),
536 SourceRange(AtInterfaceLoc, ClassLoc))) {
540 IDecl->setSuperClass(SuperClassDecl);
541 IDecl->setSuperClassLoc(SuperLoc);
542 IDecl->setEndOfDefinitionLoc(SuperLoc);
544 } else { // we have a root class.
545 IDecl->setEndOfDefinitionLoc(ClassLoc);
548 // Check then save referenced protocols.
550 IDecl->setProtocolList((ObjCProtocolDecl*const*)ProtoRefs, NumProtoRefs,
552 IDecl->setEndOfDefinitionLoc(EndProtoLoc);
555 CheckObjCDeclScope(IDecl);
556 return ActOnObjCContainerStartDefinition(IDecl);
559 /// ActOnCompatibilityAlias - this action is called after complete parsing of
560 /// a \@compatibility_alias declaration. It sets up the alias relationships.
561 Decl *Sema::ActOnCompatibilityAlias(SourceLocation AtLoc,
562 IdentifierInfo *AliasName,
563 SourceLocation AliasLocation,
564 IdentifierInfo *ClassName,
565 SourceLocation ClassLocation) {
566 // Look for previous declaration of alias name
567 NamedDecl *ADecl = LookupSingleName(TUScope, AliasName, AliasLocation,
568 LookupOrdinaryName, ForRedeclaration);
570 if (isa<ObjCCompatibleAliasDecl>(ADecl))
571 Diag(AliasLocation, diag::warn_previous_alias_decl);
573 Diag(AliasLocation, diag::err_conflicting_aliasing_type) << AliasName;
574 Diag(ADecl->getLocation(), diag::note_previous_declaration);
577 // Check for class declaration
578 NamedDecl *CDeclU = LookupSingleName(TUScope, ClassName, ClassLocation,
579 LookupOrdinaryName, ForRedeclaration);
580 if (const TypedefNameDecl *TDecl =
581 dyn_cast_or_null<TypedefNameDecl>(CDeclU)) {
582 QualType T = TDecl->getUnderlyingType();
583 if (T->isObjCObjectType()) {
584 if (NamedDecl *IDecl = T->getAs<ObjCObjectType>()->getInterface()) {
585 ClassName = IDecl->getIdentifier();
586 CDeclU = LookupSingleName(TUScope, ClassName, ClassLocation,
587 LookupOrdinaryName, ForRedeclaration);
591 ObjCInterfaceDecl *CDecl = dyn_cast_or_null<ObjCInterfaceDecl>(CDeclU);
593 Diag(ClassLocation, diag::warn_undef_interface) << ClassName;
595 Diag(CDeclU->getLocation(), diag::note_previous_declaration);
599 // Everything checked out, instantiate a new alias declaration AST.
600 ObjCCompatibleAliasDecl *AliasDecl =
601 ObjCCompatibleAliasDecl::Create(Context, CurContext, AtLoc, AliasName, CDecl);
603 if (!CheckObjCDeclScope(AliasDecl))
604 PushOnScopeChains(AliasDecl, TUScope);
609 bool Sema::CheckForwardProtocolDeclarationForCircularDependency(
610 IdentifierInfo *PName,
611 SourceLocation &Ploc, SourceLocation PrevLoc,
612 const ObjCList<ObjCProtocolDecl> &PList) {
615 for (ObjCList<ObjCProtocolDecl>::iterator I = PList.begin(),
616 E = PList.end(); I != E; ++I) {
617 if (ObjCProtocolDecl *PDecl = LookupProtocol((*I)->getIdentifier(),
619 if (PDecl->getIdentifier() == PName) {
620 Diag(Ploc, diag::err_protocol_has_circular_dependency);
621 Diag(PrevLoc, diag::note_previous_definition);
625 if (!PDecl->hasDefinition())
628 if (CheckForwardProtocolDeclarationForCircularDependency(PName, Ploc,
629 PDecl->getLocation(), PDecl->getReferencedProtocols()))
637 Sema::ActOnStartProtocolInterface(SourceLocation AtProtoInterfaceLoc,
638 IdentifierInfo *ProtocolName,
639 SourceLocation ProtocolLoc,
640 Decl * const *ProtoRefs,
641 unsigned NumProtoRefs,
642 const SourceLocation *ProtoLocs,
643 SourceLocation EndProtoLoc,
644 AttributeList *AttrList) {
646 // FIXME: Deal with AttrList.
647 assert(ProtocolName && "Missing protocol identifier");
648 ObjCProtocolDecl *PrevDecl = LookupProtocol(ProtocolName, ProtocolLoc,
650 ObjCProtocolDecl *PDecl = 0;
651 if (ObjCProtocolDecl *Def = PrevDecl? PrevDecl->getDefinition() : 0) {
652 // If we already have a definition, complain.
653 Diag(ProtocolLoc, diag::warn_duplicate_protocol_def) << ProtocolName;
654 Diag(Def->getLocation(), diag::note_previous_definition);
656 // Create a new protocol that is completely distinct from previous
657 // declarations, and do not make this protocol available for name lookup.
658 // That way, we'll end up completely ignoring the duplicate.
659 // FIXME: Can we turn this into an error?
660 PDecl = ObjCProtocolDecl::Create(Context, CurContext, ProtocolName,
661 ProtocolLoc, AtProtoInterfaceLoc,
663 PDecl->startDefinition();
666 // Check for circular dependencies among protocol declarations. This can
667 // only happen if this protocol was forward-declared.
668 ObjCList<ObjCProtocolDecl> PList;
669 PList.set((ObjCProtocolDecl *const*)ProtoRefs, NumProtoRefs, Context);
670 err = CheckForwardProtocolDeclarationForCircularDependency(
671 ProtocolName, ProtocolLoc, PrevDecl->getLocation(), PList);
674 // Create the new declaration.
675 PDecl = ObjCProtocolDecl::Create(Context, CurContext, ProtocolName,
676 ProtocolLoc, AtProtoInterfaceLoc,
677 /*PrevDecl=*/PrevDecl);
679 PushOnScopeChains(PDecl, TUScope);
680 PDecl->startDefinition();
684 ProcessDeclAttributeList(TUScope, PDecl, AttrList);
686 // Merge attributes from previous declarations.
688 mergeDeclAttributes(PDecl, PrevDecl);
690 if (!err && NumProtoRefs ) {
691 /// Check then save referenced protocols.
692 PDecl->setProtocolList((ObjCProtocolDecl*const*)ProtoRefs, NumProtoRefs,
696 CheckObjCDeclScope(PDecl);
697 return ActOnObjCContainerStartDefinition(PDecl);
700 /// FindProtocolDeclaration - This routine looks up protocols and
701 /// issues an error if they are not declared. It returns list of
702 /// protocol declarations in its 'Protocols' argument.
704 Sema::FindProtocolDeclaration(bool WarnOnDeclarations,
705 const IdentifierLocPair *ProtocolId,
706 unsigned NumProtocols,
707 SmallVectorImpl<Decl *> &Protocols) {
708 for (unsigned i = 0; i != NumProtocols; ++i) {
709 ObjCProtocolDecl *PDecl = LookupProtocol(ProtocolId[i].first,
710 ProtocolId[i].second);
712 DeclFilterCCC<ObjCProtocolDecl> Validator;
713 TypoCorrection Corrected = CorrectTypo(
714 DeclarationNameInfo(ProtocolId[i].first, ProtocolId[i].second),
715 LookupObjCProtocolName, TUScope, NULL, Validator);
716 if ((PDecl = Corrected.getCorrectionDeclAs<ObjCProtocolDecl>())) {
717 Diag(ProtocolId[i].second, diag::err_undeclared_protocol_suggest)
718 << ProtocolId[i].first << Corrected.getCorrection();
719 Diag(PDecl->getLocation(), diag::note_previous_decl)
720 << PDecl->getDeclName();
725 Diag(ProtocolId[i].second, diag::err_undeclared_protocol)
726 << ProtocolId[i].first;
730 (void)DiagnoseUseOfDecl(PDecl, ProtocolId[i].second);
732 // If this is a forward declaration and we are supposed to warn in this
734 if (WarnOnDeclarations && !PDecl->hasDefinition())
735 Diag(ProtocolId[i].second, diag::warn_undef_protocolref)
736 << ProtocolId[i].first;
737 Protocols.push_back(PDecl);
741 /// DiagnoseClassExtensionDupMethods - Check for duplicate declaration of
742 /// a class method in its extension.
744 void Sema::DiagnoseClassExtensionDupMethods(ObjCCategoryDecl *CAT,
745 ObjCInterfaceDecl *ID) {
747 return; // Possibly due to previous error
749 llvm::DenseMap<Selector, const ObjCMethodDecl*> MethodMap;
750 for (ObjCInterfaceDecl::method_iterator i = ID->meth_begin(),
751 e = ID->meth_end(); i != e; ++i) {
752 ObjCMethodDecl *MD = *i;
753 MethodMap[MD->getSelector()] = MD;
756 if (MethodMap.empty())
758 for (ObjCCategoryDecl::method_iterator i = CAT->meth_begin(),
759 e = CAT->meth_end(); i != e; ++i) {
760 ObjCMethodDecl *Method = *i;
761 const ObjCMethodDecl *&PrevMethod = MethodMap[Method->getSelector()];
762 if (PrevMethod && !MatchTwoMethodDeclarations(Method, PrevMethod)) {
763 Diag(Method->getLocation(), diag::err_duplicate_method_decl)
764 << Method->getDeclName();
765 Diag(PrevMethod->getLocation(), diag::note_previous_declaration);
770 /// ActOnForwardProtocolDeclaration - Handle \@protocol foo;
772 Sema::ActOnForwardProtocolDeclaration(SourceLocation AtProtocolLoc,
773 const IdentifierLocPair *IdentList,
775 AttributeList *attrList) {
776 SmallVector<Decl *, 8> DeclsInGroup;
777 for (unsigned i = 0; i != NumElts; ++i) {
778 IdentifierInfo *Ident = IdentList[i].first;
779 ObjCProtocolDecl *PrevDecl = LookupProtocol(Ident, IdentList[i].second,
781 ObjCProtocolDecl *PDecl
782 = ObjCProtocolDecl::Create(Context, CurContext, Ident,
783 IdentList[i].second, AtProtocolLoc,
786 PushOnScopeChains(PDecl, TUScope);
787 CheckObjCDeclScope(PDecl);
790 ProcessDeclAttributeList(TUScope, PDecl, attrList);
793 mergeDeclAttributes(PDecl, PrevDecl);
795 DeclsInGroup.push_back(PDecl);
798 return BuildDeclaratorGroup(DeclsInGroup.data(), DeclsInGroup.size(), false);
802 ActOnStartCategoryInterface(SourceLocation AtInterfaceLoc,
803 IdentifierInfo *ClassName, SourceLocation ClassLoc,
804 IdentifierInfo *CategoryName,
805 SourceLocation CategoryLoc,
806 Decl * const *ProtoRefs,
807 unsigned NumProtoRefs,
808 const SourceLocation *ProtoLocs,
809 SourceLocation EndProtoLoc) {
810 ObjCCategoryDecl *CDecl;
811 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true);
813 /// Check that class of this category is already completely declared.
816 || RequireCompleteType(ClassLoc, Context.getObjCInterfaceType(IDecl),
817 diag::err_category_forward_interface,
818 CategoryName == 0)) {
819 // Create an invalid ObjCCategoryDecl to serve as context for
820 // the enclosing method declarations. We mark the decl invalid
821 // to make it clear that this isn't a valid AST.
822 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc,
823 ClassLoc, CategoryLoc, CategoryName,IDecl);
824 CDecl->setInvalidDecl();
825 CurContext->addDecl(CDecl);
828 Diag(ClassLoc, diag::err_undef_interface) << ClassName;
829 return ActOnObjCContainerStartDefinition(CDecl);
832 if (!CategoryName && IDecl->getImplementation()) {
833 Diag(ClassLoc, diag::err_class_extension_after_impl) << ClassName;
834 Diag(IDecl->getImplementation()->getLocation(),
835 diag::note_implementation_declared);
839 /// Check for duplicate interface declaration for this category
840 ObjCCategoryDecl *CDeclChain;
841 for (CDeclChain = IDecl->getCategoryList(); CDeclChain;
842 CDeclChain = CDeclChain->getNextClassCategory()) {
843 if (CDeclChain->getIdentifier() == CategoryName) {
844 // Class extensions can be declared multiple times.
845 Diag(CategoryLoc, diag::warn_dup_category_def)
846 << ClassName << CategoryName;
847 Diag(CDeclChain->getLocation(), diag::note_previous_definition);
853 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc,
854 ClassLoc, CategoryLoc, CategoryName, IDecl);
855 // FIXME: PushOnScopeChains?
856 CurContext->addDecl(CDecl);
859 CDecl->setProtocolList((ObjCProtocolDecl*const*)ProtoRefs, NumProtoRefs,
861 // Protocols in the class extension belong to the class.
862 if (CDecl->IsClassExtension())
863 IDecl->mergeClassExtensionProtocolList((ObjCProtocolDecl*const*)ProtoRefs,
864 NumProtoRefs, Context);
867 CheckObjCDeclScope(CDecl);
868 return ActOnObjCContainerStartDefinition(CDecl);
871 /// ActOnStartCategoryImplementation - Perform semantic checks on the
872 /// category implementation declaration and build an ObjCCategoryImplDecl
874 Decl *Sema::ActOnStartCategoryImplementation(
875 SourceLocation AtCatImplLoc,
876 IdentifierInfo *ClassName, SourceLocation ClassLoc,
877 IdentifierInfo *CatName, SourceLocation CatLoc) {
878 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true);
879 ObjCCategoryDecl *CatIDecl = 0;
880 if (IDecl && IDecl->hasDefinition()) {
881 CatIDecl = IDecl->FindCategoryDeclaration(CatName);
883 // Category @implementation with no corresponding @interface.
884 // Create and install one.
885 CatIDecl = ObjCCategoryDecl::Create(Context, CurContext, AtCatImplLoc,
888 CatIDecl->setImplicit();
892 ObjCCategoryImplDecl *CDecl =
893 ObjCCategoryImplDecl::Create(Context, CurContext, CatName, IDecl,
894 ClassLoc, AtCatImplLoc, CatLoc);
895 /// Check that class of this category is already completely declared.
897 Diag(ClassLoc, diag::err_undef_interface) << ClassName;
898 CDecl->setInvalidDecl();
899 } else if (RequireCompleteType(ClassLoc, Context.getObjCInterfaceType(IDecl),
900 diag::err_undef_interface)) {
901 CDecl->setInvalidDecl();
904 // FIXME: PushOnScopeChains?
905 CurContext->addDecl(CDecl);
907 // If the interface is deprecated/unavailable, warn/error about it.
909 DiagnoseUseOfDecl(IDecl, ClassLoc);
911 /// Check that CatName, category name, is not used in another implementation.
913 if (CatIDecl->getImplementation()) {
914 Diag(ClassLoc, diag::err_dup_implementation_category) << ClassName
916 Diag(CatIDecl->getImplementation()->getLocation(),
917 diag::note_previous_definition);
919 CatIDecl->setImplementation(CDecl);
920 // Warn on implementating category of deprecated class under
921 // -Wdeprecated-implementations flag.
922 DiagnoseObjCImplementedDeprecations(*this,
923 dyn_cast<NamedDecl>(IDecl),
924 CDecl->getLocation(), 2);
928 CheckObjCDeclScope(CDecl);
929 return ActOnObjCContainerStartDefinition(CDecl);
932 Decl *Sema::ActOnStartClassImplementation(
933 SourceLocation AtClassImplLoc,
934 IdentifierInfo *ClassName, SourceLocation ClassLoc,
935 IdentifierInfo *SuperClassname,
936 SourceLocation SuperClassLoc) {
937 ObjCInterfaceDecl* IDecl = 0;
938 // Check for another declaration kind with the same name.
940 = LookupSingleName(TUScope, ClassName, ClassLoc, LookupOrdinaryName,
942 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
943 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName;
944 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
945 } else if ((IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl))) {
946 RequireCompleteType(ClassLoc, Context.getObjCInterfaceType(IDecl),
947 diag::warn_undef_interface);
949 // We did not find anything with the name ClassName; try to correct for
950 // typos in the class name.
951 ObjCInterfaceValidatorCCC Validator;
952 if (TypoCorrection Corrected = CorrectTypo(
953 DeclarationNameInfo(ClassName, ClassLoc), LookupOrdinaryName, TUScope,
955 // Suggest the (potentially) correct interface name. However, put the
956 // fix-it hint itself in a separate note, since changing the name in
957 // the warning would make the fix-it change semantics.However, don't
958 // provide a code-modification hint or use the typo name for recovery,
959 // because this is just a warning. The program may actually be correct.
960 IDecl = Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>();
961 DeclarationName CorrectedName = Corrected.getCorrection();
962 Diag(ClassLoc, diag::warn_undef_interface_suggest)
963 << ClassName << CorrectedName;
964 Diag(IDecl->getLocation(), diag::note_previous_decl) << CorrectedName
965 << FixItHint::CreateReplacement(ClassLoc, CorrectedName.getAsString());
968 Diag(ClassLoc, diag::warn_undef_interface) << ClassName;
972 // Check that super class name is valid class name
973 ObjCInterfaceDecl* SDecl = 0;
974 if (SuperClassname) {
975 // Check if a different kind of symbol declared in this scope.
976 PrevDecl = LookupSingleName(TUScope, SuperClassname, SuperClassLoc,
978 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
979 Diag(SuperClassLoc, diag::err_redefinition_different_kind)
981 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
983 SDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
984 if (SDecl && !SDecl->hasDefinition())
987 Diag(SuperClassLoc, diag::err_undef_superclass)
988 << SuperClassname << ClassName;
989 else if (IDecl && !declaresSameEntity(IDecl->getSuperClass(), SDecl)) {
990 // This implementation and its interface do not have the same
992 Diag(SuperClassLoc, diag::err_conflicting_super_class)
993 << SDecl->getDeclName();
994 Diag(SDecl->getLocation(), diag::note_previous_definition);
1000 // Legacy case of @implementation with no corresponding @interface.
1001 // Build, chain & install the interface decl into the identifier.
1003 // FIXME: Do we support attributes on the @implementation? If so we should
1005 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtClassImplLoc,
1006 ClassName, /*PrevDecl=*/0, ClassLoc,
1008 IDecl->startDefinition();
1010 IDecl->setSuperClass(SDecl);
1011 IDecl->setSuperClassLoc(SuperClassLoc);
1012 IDecl->setEndOfDefinitionLoc(SuperClassLoc);
1014 IDecl->setEndOfDefinitionLoc(ClassLoc);
1017 PushOnScopeChains(IDecl, TUScope);
1019 // Mark the interface as being completed, even if it was just as
1021 // declaration; the user cannot reopen it.
1022 if (!IDecl->hasDefinition())
1023 IDecl->startDefinition();
1026 ObjCImplementationDecl* IMPDecl =
1027 ObjCImplementationDecl::Create(Context, CurContext, IDecl, SDecl,
1028 ClassLoc, AtClassImplLoc);
1030 if (CheckObjCDeclScope(IMPDecl))
1031 return ActOnObjCContainerStartDefinition(IMPDecl);
1033 // Check that there is no duplicate implementation of this class.
1034 if (IDecl->getImplementation()) {
1035 // FIXME: Don't leak everything!
1036 Diag(ClassLoc, diag::err_dup_implementation_class) << ClassName;
1037 Diag(IDecl->getImplementation()->getLocation(),
1038 diag::note_previous_definition);
1039 } else { // add it to the list.
1040 IDecl->setImplementation(IMPDecl);
1041 PushOnScopeChains(IMPDecl, TUScope);
1042 // Warn on implementating deprecated class under
1043 // -Wdeprecated-implementations flag.
1044 DiagnoseObjCImplementedDeprecations(*this,
1045 dyn_cast<NamedDecl>(IDecl),
1046 IMPDecl->getLocation(), 1);
1048 return ActOnObjCContainerStartDefinition(IMPDecl);
1051 Sema::DeclGroupPtrTy
1052 Sema::ActOnFinishObjCImplementation(Decl *ObjCImpDecl, ArrayRef<Decl *> Decls) {
1053 SmallVector<Decl *, 64> DeclsInGroup;
1054 DeclsInGroup.reserve(Decls.size() + 1);
1056 for (unsigned i = 0, e = Decls.size(); i != e; ++i) {
1057 Decl *Dcl = Decls[i];
1060 if (Dcl->getDeclContext()->isFileContext())
1061 Dcl->setTopLevelDeclInObjCContainer();
1062 DeclsInGroup.push_back(Dcl);
1065 DeclsInGroup.push_back(ObjCImpDecl);
1067 return BuildDeclaratorGroup(DeclsInGroup.data(), DeclsInGroup.size(), false);
1070 void Sema::CheckImplementationIvars(ObjCImplementationDecl *ImpDecl,
1071 ObjCIvarDecl **ivars, unsigned numIvars,
1072 SourceLocation RBrace) {
1073 assert(ImpDecl && "missing implementation decl");
1074 ObjCInterfaceDecl* IDecl = ImpDecl->getClassInterface();
1077 /// Check case of non-existing \@interface decl.
1078 /// (legacy objective-c \@implementation decl without an \@interface decl).
1079 /// Add implementations's ivar to the synthesize class's ivar list.
1080 if (IDecl->isImplicitInterfaceDecl()) {
1081 IDecl->setEndOfDefinitionLoc(RBrace);
1082 // Add ivar's to class's DeclContext.
1083 for (unsigned i = 0, e = numIvars; i != e; ++i) {
1084 ivars[i]->setLexicalDeclContext(ImpDecl);
1085 IDecl->makeDeclVisibleInContext(ivars[i]);
1086 ImpDecl->addDecl(ivars[i]);
1091 // If implementation has empty ivar list, just return.
1095 assert(ivars && "missing @implementation ivars");
1096 if (LangOpts.ObjCRuntime.isNonFragile()) {
1097 if (ImpDecl->getSuperClass())
1098 Diag(ImpDecl->getLocation(), diag::warn_on_superclass_use);
1099 for (unsigned i = 0; i < numIvars; i++) {
1100 ObjCIvarDecl* ImplIvar = ivars[i];
1101 if (const ObjCIvarDecl *ClsIvar =
1102 IDecl->getIvarDecl(ImplIvar->getIdentifier())) {
1103 Diag(ImplIvar->getLocation(), diag::err_duplicate_ivar_declaration);
1104 Diag(ClsIvar->getLocation(), diag::note_previous_definition);
1107 // Instance ivar to Implementation's DeclContext.
1108 ImplIvar->setLexicalDeclContext(ImpDecl);
1109 IDecl->makeDeclVisibleInContext(ImplIvar);
1110 ImpDecl->addDecl(ImplIvar);
1114 // Check interface's Ivar list against those in the implementation.
1115 // names and types must match.
1118 ObjCInterfaceDecl::ivar_iterator
1119 IVI = IDecl->ivar_begin(), IVE = IDecl->ivar_end();
1120 for (; numIvars > 0 && IVI != IVE; ++IVI) {
1121 ObjCIvarDecl* ImplIvar = ivars[j++];
1122 ObjCIvarDecl* ClsIvar = *IVI;
1123 assert (ImplIvar && "missing implementation ivar");
1124 assert (ClsIvar && "missing class ivar");
1126 // First, make sure the types match.
1127 if (!Context.hasSameType(ImplIvar->getType(), ClsIvar->getType())) {
1128 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_type)
1129 << ImplIvar->getIdentifier()
1130 << ImplIvar->getType() << ClsIvar->getType();
1131 Diag(ClsIvar->getLocation(), diag::note_previous_definition);
1132 } else if (ImplIvar->isBitField() && ClsIvar->isBitField() &&
1133 ImplIvar->getBitWidthValue(Context) !=
1134 ClsIvar->getBitWidthValue(Context)) {
1135 Diag(ImplIvar->getBitWidth()->getLocStart(),
1136 diag::err_conflicting_ivar_bitwidth) << ImplIvar->getIdentifier();
1137 Diag(ClsIvar->getBitWidth()->getLocStart(),
1138 diag::note_previous_definition);
1140 // Make sure the names are identical.
1141 if (ImplIvar->getIdentifier() != ClsIvar->getIdentifier()) {
1142 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_name)
1143 << ImplIvar->getIdentifier() << ClsIvar->getIdentifier();
1144 Diag(ClsIvar->getLocation(), diag::note_previous_definition);
1150 Diag(ivars[j]->getLocation(), diag::err_inconsistant_ivar_count);
1151 else if (IVI != IVE)
1152 Diag(IVI->getLocation(), diag::err_inconsistant_ivar_count);
1155 void Sema::WarnUndefinedMethod(SourceLocation ImpLoc, ObjCMethodDecl *method,
1156 bool &IncompleteImpl, unsigned DiagID) {
1157 // No point warning no definition of method which is 'unavailable'.
1158 if (method->hasAttr<UnavailableAttr>())
1160 if (!IncompleteImpl) {
1161 Diag(ImpLoc, diag::warn_incomplete_impl);
1162 IncompleteImpl = true;
1164 if (DiagID == diag::warn_unimplemented_protocol_method)
1165 Diag(ImpLoc, DiagID) << method->getDeclName();
1167 Diag(method->getLocation(), DiagID) << method->getDeclName();
1170 /// Determines if type B can be substituted for type A. Returns true if we can
1171 /// guarantee that anything that the user will do to an object of type A can
1172 /// also be done to an object of type B. This is trivially true if the two
1173 /// types are the same, or if B is a subclass of A. It becomes more complex
1174 /// in cases where protocols are involved.
1176 /// Object types in Objective-C describe the minimum requirements for an
1177 /// object, rather than providing a complete description of a type. For
1178 /// example, if A is a subclass of B, then B* may refer to an instance of A.
1179 /// The principle of substitutability means that we may use an instance of A
1180 /// anywhere that we may use an instance of B - it will implement all of the
1181 /// ivars of B and all of the methods of B.
1183 /// This substitutability is important when type checking methods, because
1184 /// the implementation may have stricter type definitions than the interface.
1185 /// The interface specifies minimum requirements, but the implementation may
1186 /// have more accurate ones. For example, a method may privately accept
1187 /// instances of B, but only publish that it accepts instances of A. Any
1188 /// object passed to it will be type checked against B, and so will implicitly
1189 /// by a valid A*. Similarly, a method may return a subclass of the class that
1190 /// it is declared as returning.
1192 /// This is most important when considering subclassing. A method in a
1193 /// subclass must accept any object as an argument that its superclass's
1194 /// implementation accepts. It may, however, accept a more general type
1195 /// without breaking substitutability (i.e. you can still use the subclass
1196 /// anywhere that you can use the superclass, but not vice versa). The
1197 /// converse requirement applies to return types: the return type for a
1198 /// subclass method must be a valid object of the kind that the superclass
1199 /// advertises, but it may be specified more accurately. This avoids the need
1200 /// for explicit down-casting by callers.
1202 /// Note: This is a stricter requirement than for assignment.
1203 static bool isObjCTypeSubstitutable(ASTContext &Context,
1204 const ObjCObjectPointerType *A,
1205 const ObjCObjectPointerType *B,
1207 // Reject a protocol-unqualified id.
1208 if (rejectId && B->isObjCIdType()) return false;
1210 // If B is a qualified id, then A must also be a qualified id and it must
1211 // implement all of the protocols in B. It may not be a qualified class.
1212 // For example, MyClass<A> can be assigned to id<A>, but MyClass<A> is a
1213 // stricter definition so it is not substitutable for id<A>.
1214 if (B->isObjCQualifiedIdType()) {
1215 return A->isObjCQualifiedIdType() &&
1216 Context.ObjCQualifiedIdTypesAreCompatible(QualType(A, 0),
1222 // id is a special type that bypasses type checking completely. We want a
1223 // warning when it is used in one place but not another.
1224 if (C.isObjCIdType(A) || C.isObjCIdType(B)) return false;
1227 // If B is a qualified id, then A must also be a qualified id (which it isn't
1228 // if we've got this far)
1229 if (B->isObjCQualifiedIdType()) return false;
1232 // Now we know that A and B are (potentially-qualified) class types. The
1233 // normal rules for assignment apply.
1234 return Context.canAssignObjCInterfaces(A, B);
1237 static SourceRange getTypeRange(TypeSourceInfo *TSI) {
1238 return (TSI ? TSI->getTypeLoc().getSourceRange() : SourceRange());
1241 static bool CheckMethodOverrideReturn(Sema &S,
1242 ObjCMethodDecl *MethodImpl,
1243 ObjCMethodDecl *MethodDecl,
1244 bool IsProtocolMethodDecl,
1245 bool IsOverridingMode,
1247 if (IsProtocolMethodDecl &&
1248 (MethodDecl->getObjCDeclQualifier() !=
1249 MethodImpl->getObjCDeclQualifier())) {
1251 S.Diag(MethodImpl->getLocation(),
1253 diag::warn_conflicting_overriding_ret_type_modifiers
1254 : diag::warn_conflicting_ret_type_modifiers))
1255 << MethodImpl->getDeclName()
1256 << getTypeRange(MethodImpl->getResultTypeSourceInfo());
1257 S.Diag(MethodDecl->getLocation(), diag::note_previous_declaration)
1258 << getTypeRange(MethodDecl->getResultTypeSourceInfo());
1264 if (S.Context.hasSameUnqualifiedType(MethodImpl->getResultType(),
1265 MethodDecl->getResultType()))
1271 IsOverridingMode ? diag::warn_conflicting_overriding_ret_types
1272 : diag::warn_conflicting_ret_types;
1274 // Mismatches between ObjC pointers go into a different warning
1275 // category, and sometimes they're even completely whitelisted.
1276 if (const ObjCObjectPointerType *ImplPtrTy =
1277 MethodImpl->getResultType()->getAs<ObjCObjectPointerType>()) {
1278 if (const ObjCObjectPointerType *IfacePtrTy =
1279 MethodDecl->getResultType()->getAs<ObjCObjectPointerType>()) {
1280 // Allow non-matching return types as long as they don't violate
1281 // the principle of substitutability. Specifically, we permit
1282 // return types that are subclasses of the declared return type,
1283 // or that are more-qualified versions of the declared type.
1284 if (isObjCTypeSubstitutable(S.Context, IfacePtrTy, ImplPtrTy, false))
1288 IsOverridingMode ? diag::warn_non_covariant_overriding_ret_types
1289 : diag::warn_non_covariant_ret_types;
1293 S.Diag(MethodImpl->getLocation(), DiagID)
1294 << MethodImpl->getDeclName()
1295 << MethodDecl->getResultType()
1296 << MethodImpl->getResultType()
1297 << getTypeRange(MethodImpl->getResultTypeSourceInfo());
1298 S.Diag(MethodDecl->getLocation(),
1299 IsOverridingMode ? diag::note_previous_declaration
1300 : diag::note_previous_definition)
1301 << getTypeRange(MethodDecl->getResultTypeSourceInfo());
1305 static bool CheckMethodOverrideParam(Sema &S,
1306 ObjCMethodDecl *MethodImpl,
1307 ObjCMethodDecl *MethodDecl,
1308 ParmVarDecl *ImplVar,
1309 ParmVarDecl *IfaceVar,
1310 bool IsProtocolMethodDecl,
1311 bool IsOverridingMode,
1313 if (IsProtocolMethodDecl &&
1314 (ImplVar->getObjCDeclQualifier() !=
1315 IfaceVar->getObjCDeclQualifier())) {
1317 if (IsOverridingMode)
1318 S.Diag(ImplVar->getLocation(),
1319 diag::warn_conflicting_overriding_param_modifiers)
1320 << getTypeRange(ImplVar->getTypeSourceInfo())
1321 << MethodImpl->getDeclName();
1322 else S.Diag(ImplVar->getLocation(),
1323 diag::warn_conflicting_param_modifiers)
1324 << getTypeRange(ImplVar->getTypeSourceInfo())
1325 << MethodImpl->getDeclName();
1326 S.Diag(IfaceVar->getLocation(), diag::note_previous_declaration)
1327 << getTypeRange(IfaceVar->getTypeSourceInfo());
1333 QualType ImplTy = ImplVar->getType();
1334 QualType IfaceTy = IfaceVar->getType();
1336 if (S.Context.hasSameUnqualifiedType(ImplTy, IfaceTy))
1342 IsOverridingMode ? diag::warn_conflicting_overriding_param_types
1343 : diag::warn_conflicting_param_types;
1345 // Mismatches between ObjC pointers go into a different warning
1346 // category, and sometimes they're even completely whitelisted.
1347 if (const ObjCObjectPointerType *ImplPtrTy =
1348 ImplTy->getAs<ObjCObjectPointerType>()) {
1349 if (const ObjCObjectPointerType *IfacePtrTy =
1350 IfaceTy->getAs<ObjCObjectPointerType>()) {
1351 // Allow non-matching argument types as long as they don't
1352 // violate the principle of substitutability. Specifically, the
1353 // implementation must accept any objects that the superclass
1354 // accepts, however it may also accept others.
1355 if (isObjCTypeSubstitutable(S.Context, ImplPtrTy, IfacePtrTy, true))
1359 IsOverridingMode ? diag::warn_non_contravariant_overriding_param_types
1360 : diag::warn_non_contravariant_param_types;
1364 S.Diag(ImplVar->getLocation(), DiagID)
1365 << getTypeRange(ImplVar->getTypeSourceInfo())
1366 << MethodImpl->getDeclName() << IfaceTy << ImplTy;
1367 S.Diag(IfaceVar->getLocation(),
1368 (IsOverridingMode ? diag::note_previous_declaration
1369 : diag::note_previous_definition))
1370 << getTypeRange(IfaceVar->getTypeSourceInfo());
1374 /// In ARC, check whether the conventional meanings of the two methods
1375 /// match. If they don't, it's a hard error.
1376 static bool checkMethodFamilyMismatch(Sema &S, ObjCMethodDecl *impl,
1377 ObjCMethodDecl *decl) {
1378 ObjCMethodFamily implFamily = impl->getMethodFamily();
1379 ObjCMethodFamily declFamily = decl->getMethodFamily();
1380 if (implFamily == declFamily) return false;
1382 // Since conventions are sorted by selector, the only possibility is
1383 // that the types differ enough to cause one selector or the other
1384 // to fall out of the family.
1385 assert(implFamily == OMF_None || declFamily == OMF_None);
1387 // No further diagnostics required on invalid declarations.
1388 if (impl->isInvalidDecl() || decl->isInvalidDecl()) return true;
1390 const ObjCMethodDecl *unmatched = impl;
1391 ObjCMethodFamily family = declFamily;
1392 unsigned errorID = diag::err_arc_lost_method_convention;
1393 unsigned noteID = diag::note_arc_lost_method_convention;
1394 if (declFamily == OMF_None) {
1396 family = implFamily;
1397 errorID = diag::err_arc_gained_method_convention;
1398 noteID = diag::note_arc_gained_method_convention;
1401 // Indexes into a %select clause in the diagnostic.
1402 enum FamilySelector {
1403 F_alloc, F_copy, F_mutableCopy = F_copy, F_init, F_new
1405 FamilySelector familySelector = FamilySelector();
1408 case OMF_None: llvm_unreachable("logic error, no method convention");
1411 case OMF_autorelease:
1414 case OMF_retainCount:
1416 case OMF_performSelector:
1417 // Mismatches for these methods don't change ownership
1418 // conventions, so we don't care.
1421 case OMF_init: familySelector = F_init; break;
1422 case OMF_alloc: familySelector = F_alloc; break;
1423 case OMF_copy: familySelector = F_copy; break;
1424 case OMF_mutableCopy: familySelector = F_mutableCopy; break;
1425 case OMF_new: familySelector = F_new; break;
1428 enum ReasonSelector { R_NonObjectReturn, R_UnrelatedReturn };
1429 ReasonSelector reasonSelector;
1431 // The only reason these methods don't fall within their families is
1432 // due to unusual result types.
1433 if (unmatched->getResultType()->isObjCObjectPointerType()) {
1434 reasonSelector = R_UnrelatedReturn;
1436 reasonSelector = R_NonObjectReturn;
1439 S.Diag(impl->getLocation(), errorID) << familySelector << reasonSelector;
1440 S.Diag(decl->getLocation(), noteID) << familySelector << reasonSelector;
1445 void Sema::WarnConflictingTypedMethods(ObjCMethodDecl *ImpMethodDecl,
1446 ObjCMethodDecl *MethodDecl,
1447 bool IsProtocolMethodDecl) {
1448 if (getLangOpts().ObjCAutoRefCount &&
1449 checkMethodFamilyMismatch(*this, ImpMethodDecl, MethodDecl))
1452 CheckMethodOverrideReturn(*this, ImpMethodDecl, MethodDecl,
1453 IsProtocolMethodDecl, false,
1456 for (ObjCMethodDecl::param_iterator IM = ImpMethodDecl->param_begin(),
1457 IF = MethodDecl->param_begin(), EM = ImpMethodDecl->param_end(),
1458 EF = MethodDecl->param_end();
1459 IM != EM && IF != EF; ++IM, ++IF) {
1460 CheckMethodOverrideParam(*this, ImpMethodDecl, MethodDecl, *IM, *IF,
1461 IsProtocolMethodDecl, false, true);
1464 if (ImpMethodDecl->isVariadic() != MethodDecl->isVariadic()) {
1465 Diag(ImpMethodDecl->getLocation(),
1466 diag::warn_conflicting_variadic);
1467 Diag(MethodDecl->getLocation(), diag::note_previous_declaration);
1471 void Sema::CheckConflictingOverridingMethod(ObjCMethodDecl *Method,
1472 ObjCMethodDecl *Overridden,
1473 bool IsProtocolMethodDecl) {
1475 CheckMethodOverrideReturn(*this, Method, Overridden,
1476 IsProtocolMethodDecl, true,
1479 for (ObjCMethodDecl::param_iterator IM = Method->param_begin(),
1480 IF = Overridden->param_begin(), EM = Method->param_end(),
1481 EF = Overridden->param_end();
1482 IM != EM && IF != EF; ++IM, ++IF) {
1483 CheckMethodOverrideParam(*this, Method, Overridden, *IM, *IF,
1484 IsProtocolMethodDecl, true, true);
1487 if (Method->isVariadic() != Overridden->isVariadic()) {
1488 Diag(Method->getLocation(),
1489 diag::warn_conflicting_overriding_variadic);
1490 Diag(Overridden->getLocation(), diag::note_previous_declaration);
1494 /// WarnExactTypedMethods - This routine issues a warning if method
1495 /// implementation declaration matches exactly that of its declaration.
1496 void Sema::WarnExactTypedMethods(ObjCMethodDecl *ImpMethodDecl,
1497 ObjCMethodDecl *MethodDecl,
1498 bool IsProtocolMethodDecl) {
1499 // don't issue warning when protocol method is optional because primary
1500 // class is not required to implement it and it is safe for protocol
1502 if (MethodDecl->getImplementationControl() == ObjCMethodDecl::Optional)
1504 // don't issue warning when primary class's method is
1505 // depecated/unavailable.
1506 if (MethodDecl->hasAttr<UnavailableAttr>() ||
1507 MethodDecl->hasAttr<DeprecatedAttr>())
1510 bool match = CheckMethodOverrideReturn(*this, ImpMethodDecl, MethodDecl,
1511 IsProtocolMethodDecl, false, false);
1513 for (ObjCMethodDecl::param_iterator IM = ImpMethodDecl->param_begin(),
1514 IF = MethodDecl->param_begin(), EM = ImpMethodDecl->param_end(),
1515 EF = MethodDecl->param_end();
1516 IM != EM && IF != EF; ++IM, ++IF) {
1517 match = CheckMethodOverrideParam(*this, ImpMethodDecl, MethodDecl,
1519 IsProtocolMethodDecl, false, false);
1524 match = (ImpMethodDecl->isVariadic() == MethodDecl->isVariadic());
1526 match = !(MethodDecl->isClassMethod() &&
1527 MethodDecl->getSelector() == GetNullarySelector("load", Context));
1530 Diag(ImpMethodDecl->getLocation(),
1531 diag::warn_category_method_impl_match);
1532 Diag(MethodDecl->getLocation(), diag::note_method_declared_at)
1533 << MethodDecl->getDeclName();
1537 /// FIXME: Type hierarchies in Objective-C can be deep. We could most likely
1538 /// improve the efficiency of selector lookups and type checking by associating
1539 /// with each protocol / interface / category the flattened instance tables. If
1540 /// we used an immutable set to keep the table then it wouldn't add significant
1541 /// memory cost and it would be handy for lookups.
1543 /// CheckProtocolMethodDefs - This routine checks unimplemented methods
1544 /// Declared in protocol, and those referenced by it.
1545 void Sema::CheckProtocolMethodDefs(SourceLocation ImpLoc,
1546 ObjCProtocolDecl *PDecl,
1547 bool& IncompleteImpl,
1548 const SelectorSet &InsMap,
1549 const SelectorSet &ClsMap,
1550 ObjCContainerDecl *CDecl) {
1551 ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl);
1552 ObjCInterfaceDecl *IDecl = C ? C->getClassInterface()
1553 : dyn_cast<ObjCInterfaceDecl>(CDecl);
1554 assert (IDecl && "CheckProtocolMethodDefs - IDecl is null");
1556 ObjCInterfaceDecl *Super = IDecl->getSuperClass();
1557 ObjCInterfaceDecl *NSIDecl = 0;
1558 if (getLangOpts().ObjCRuntime.isNeXTFamily()) {
1559 // check to see if class implements forwardInvocation method and objects
1560 // of this class are derived from 'NSProxy' so that to forward requests
1561 // from one object to another.
1562 // Under such conditions, which means that every method possible is
1563 // implemented in the class, we should not issue "Method definition not
1565 // FIXME: Use a general GetUnarySelector method for this.
1566 IdentifierInfo* II = &Context.Idents.get("forwardInvocation");
1567 Selector fISelector = Context.Selectors.getSelector(1, &II);
1568 if (InsMap.count(fISelector))
1569 // Is IDecl derived from 'NSProxy'? If so, no instance methods
1570 // need be implemented in the implementation.
1571 NSIDecl = IDecl->lookupInheritedClass(&Context.Idents.get("NSProxy"));
1574 // If a method lookup fails locally we still need to look and see if
1575 // the method was implemented by a base class or an inherited
1576 // protocol. This lookup is slow, but occurs rarely in correct code
1577 // and otherwise would terminate in a warning.
1579 // check unimplemented instance methods.
1581 for (ObjCProtocolDecl::instmeth_iterator I = PDecl->instmeth_begin(),
1582 E = PDecl->instmeth_end(); I != E; ++I) {
1583 ObjCMethodDecl *method = *I;
1584 if (method->getImplementationControl() != ObjCMethodDecl::Optional &&
1585 !method->isPropertyAccessor() &&
1586 !InsMap.count(method->getSelector()) &&
1587 (!Super || !Super->lookupInstanceMethod(method->getSelector()))) {
1588 // If a method is not implemented in the category implementation but
1589 // has been declared in its primary class, superclass,
1590 // or in one of their protocols, no need to issue the warning.
1591 // This is because method will be implemented in the primary class
1592 // or one of its super class implementation.
1594 // Ugly, but necessary. Method declared in protcol might have
1595 // have been synthesized due to a property declared in the class which
1596 // uses the protocol.
1597 if (ObjCMethodDecl *MethodInClass =
1598 IDecl->lookupInstanceMethod(method->getSelector(),
1599 true /*shallowCategoryLookup*/))
1600 if (C || MethodInClass->isPropertyAccessor())
1602 unsigned DIAG = diag::warn_unimplemented_protocol_method;
1603 if (Diags.getDiagnosticLevel(DIAG, ImpLoc)
1604 != DiagnosticsEngine::Ignored) {
1605 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG);
1606 Diag(method->getLocation(), diag::note_method_declared_at)
1607 << method->getDeclName();
1608 Diag(CDecl->getLocation(), diag::note_required_for_protocol_at)
1609 << PDecl->getDeclName();
1613 // check unimplemented class methods
1614 for (ObjCProtocolDecl::classmeth_iterator
1615 I = PDecl->classmeth_begin(), E = PDecl->classmeth_end();
1617 ObjCMethodDecl *method = *I;
1618 if (method->getImplementationControl() != ObjCMethodDecl::Optional &&
1619 !ClsMap.count(method->getSelector()) &&
1620 (!Super || !Super->lookupClassMethod(method->getSelector()))) {
1621 // See above comment for instance method lookups.
1622 if (C && IDecl->lookupClassMethod(method->getSelector(),
1623 true /*shallowCategoryLookup*/))
1625 unsigned DIAG = diag::warn_unimplemented_protocol_method;
1626 if (Diags.getDiagnosticLevel(DIAG, ImpLoc) !=
1627 DiagnosticsEngine::Ignored) {
1628 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG);
1629 Diag(method->getLocation(), diag::note_method_declared_at)
1630 << method->getDeclName();
1631 Diag(IDecl->getLocation(), diag::note_required_for_protocol_at) <<
1632 PDecl->getDeclName();
1636 // Check on this protocols's referenced protocols, recursively.
1637 for (ObjCProtocolDecl::protocol_iterator PI = PDecl->protocol_begin(),
1638 E = PDecl->protocol_end(); PI != E; ++PI)
1639 CheckProtocolMethodDefs(ImpLoc, *PI, IncompleteImpl, InsMap, ClsMap, CDecl);
1642 /// MatchAllMethodDeclarations - Check methods declared in interface
1643 /// or protocol against those declared in their implementations.
1645 void Sema::MatchAllMethodDeclarations(const SelectorSet &InsMap,
1646 const SelectorSet &ClsMap,
1647 SelectorSet &InsMapSeen,
1648 SelectorSet &ClsMapSeen,
1649 ObjCImplDecl* IMPDecl,
1650 ObjCContainerDecl* CDecl,
1651 bool &IncompleteImpl,
1652 bool ImmediateClass,
1653 bool WarnCategoryMethodImpl) {
1654 // Check and see if instance methods in class interface have been
1655 // implemented in the implementation class. If so, their types match.
1656 for (ObjCInterfaceDecl::instmeth_iterator I = CDecl->instmeth_begin(),
1657 E = CDecl->instmeth_end(); I != E; ++I) {
1658 if (InsMapSeen.count((*I)->getSelector()))
1660 InsMapSeen.insert((*I)->getSelector());
1661 if (!(*I)->isPropertyAccessor() &&
1662 !InsMap.count((*I)->getSelector())) {
1664 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl,
1665 diag::note_undef_method_impl);
1668 ObjCMethodDecl *ImpMethodDecl =
1669 IMPDecl->getInstanceMethod((*I)->getSelector());
1670 assert(CDecl->getInstanceMethod((*I)->getSelector()) &&
1671 "Expected to find the method through lookup as well");
1672 ObjCMethodDecl *MethodDecl = *I;
1673 // ImpMethodDecl may be null as in a @dynamic property.
1674 if (ImpMethodDecl) {
1675 if (!WarnCategoryMethodImpl)
1676 WarnConflictingTypedMethods(ImpMethodDecl, MethodDecl,
1677 isa<ObjCProtocolDecl>(CDecl));
1678 else if (!MethodDecl->isPropertyAccessor())
1679 WarnExactTypedMethods(ImpMethodDecl, MethodDecl,
1680 isa<ObjCProtocolDecl>(CDecl));
1685 // Check and see if class methods in class interface have been
1686 // implemented in the implementation class. If so, their types match.
1687 for (ObjCInterfaceDecl::classmeth_iterator
1688 I = CDecl->classmeth_begin(), E = CDecl->classmeth_end(); I != E; ++I) {
1689 if (ClsMapSeen.count((*I)->getSelector()))
1691 ClsMapSeen.insert((*I)->getSelector());
1692 if (!ClsMap.count((*I)->getSelector())) {
1694 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl,
1695 diag::note_undef_method_impl);
1697 ObjCMethodDecl *ImpMethodDecl =
1698 IMPDecl->getClassMethod((*I)->getSelector());
1699 assert(CDecl->getClassMethod((*I)->getSelector()) &&
1700 "Expected to find the method through lookup as well");
1701 ObjCMethodDecl *MethodDecl = *I;
1702 if (!WarnCategoryMethodImpl)
1703 WarnConflictingTypedMethods(ImpMethodDecl, MethodDecl,
1704 isa<ObjCProtocolDecl>(CDecl));
1706 WarnExactTypedMethods(ImpMethodDecl, MethodDecl,
1707 isa<ObjCProtocolDecl>(CDecl));
1711 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) {
1712 // when checking that methods in implementation match their declaration,
1713 // i.e. when WarnCategoryMethodImpl is false, check declarations in class
1714 // extension; as well as those in categories.
1715 if (!WarnCategoryMethodImpl)
1716 for (const ObjCCategoryDecl *CDeclChain = I->getCategoryList();
1717 CDeclChain; CDeclChain = CDeclChain->getNextClassCategory())
1718 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen,
1720 const_cast<ObjCCategoryDecl *>(CDeclChain),
1721 IncompleteImpl, false,
1722 WarnCategoryMethodImpl);
1724 // Also methods in class extensions need be looked at next.
1725 for (const ObjCCategoryDecl *ClsExtDecl = I->getFirstClassExtension();
1726 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension())
1727 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen,
1729 const_cast<ObjCCategoryDecl *>(ClsExtDecl),
1730 IncompleteImpl, false,
1731 WarnCategoryMethodImpl);
1733 // Check for any implementation of a methods declared in protocol.
1734 for (ObjCInterfaceDecl::all_protocol_iterator
1735 PI = I->all_referenced_protocol_begin(),
1736 E = I->all_referenced_protocol_end(); PI != E; ++PI)
1737 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen,
1739 (*PI), IncompleteImpl, false,
1740 WarnCategoryMethodImpl);
1742 // FIXME. For now, we are not checking for extact match of methods
1743 // in category implementation and its primary class's super class.
1744 if (!WarnCategoryMethodImpl && I->getSuperClass())
1745 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen,
1747 I->getSuperClass(), IncompleteImpl, false);
1751 /// CheckCategoryVsClassMethodMatches - Checks that methods implemented in
1752 /// category matches with those implemented in its primary class and
1753 /// warns each time an exact match is found.
1754 void Sema::CheckCategoryVsClassMethodMatches(
1755 ObjCCategoryImplDecl *CatIMPDecl) {
1756 SelectorSet InsMap, ClsMap;
1758 for (ObjCImplementationDecl::instmeth_iterator
1759 I = CatIMPDecl->instmeth_begin(),
1760 E = CatIMPDecl->instmeth_end(); I!=E; ++I)
1761 InsMap.insert((*I)->getSelector());
1763 for (ObjCImplementationDecl::classmeth_iterator
1764 I = CatIMPDecl->classmeth_begin(),
1765 E = CatIMPDecl->classmeth_end(); I != E; ++I)
1766 ClsMap.insert((*I)->getSelector());
1767 if (InsMap.empty() && ClsMap.empty())
1770 // Get category's primary class.
1771 ObjCCategoryDecl *CatDecl = CatIMPDecl->getCategoryDecl();
1774 ObjCInterfaceDecl *IDecl = CatDecl->getClassInterface();
1777 SelectorSet InsMapSeen, ClsMapSeen;
1778 bool IncompleteImpl = false;
1779 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen,
1781 IncompleteImpl, false,
1782 true /*WarnCategoryMethodImpl*/);
1785 void Sema::ImplMethodsVsClassMethods(Scope *S, ObjCImplDecl* IMPDecl,
1786 ObjCContainerDecl* CDecl,
1787 bool IncompleteImpl) {
1789 // Check and see if instance methods in class interface have been
1790 // implemented in the implementation class.
1791 for (ObjCImplementationDecl::instmeth_iterator
1792 I = IMPDecl->instmeth_begin(), E = IMPDecl->instmeth_end(); I!=E; ++I)
1793 InsMap.insert((*I)->getSelector());
1795 // Check and see if properties declared in the interface have either 1)
1796 // an implementation or 2) there is a @synthesize/@dynamic implementation
1797 // of the property in the @implementation.
1798 if (const ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(CDecl))
1799 if (!(LangOpts.ObjCDefaultSynthProperties &&
1800 LangOpts.ObjCRuntime.isNonFragile()) ||
1801 IDecl->isObjCRequiresPropertyDefs())
1802 DiagnoseUnimplementedProperties(S, IMPDecl, CDecl, InsMap);
1805 for (ObjCImplementationDecl::classmeth_iterator
1806 I = IMPDecl->classmeth_begin(),
1807 E = IMPDecl->classmeth_end(); I != E; ++I)
1808 ClsMap.insert((*I)->getSelector());
1810 // Check for type conflict of methods declared in a class/protocol and
1811 // its implementation; if any.
1812 SelectorSet InsMapSeen, ClsMapSeen;
1813 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen,
1815 IncompleteImpl, true);
1817 // check all methods implemented in category against those declared
1818 // in its primary class.
1819 if (ObjCCategoryImplDecl *CatDecl =
1820 dyn_cast<ObjCCategoryImplDecl>(IMPDecl))
1821 CheckCategoryVsClassMethodMatches(CatDecl);
1823 // Check the protocol list for unimplemented methods in the @implementation
1825 // Check and see if class methods in class interface have been
1826 // implemented in the implementation class.
1828 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) {
1829 for (ObjCInterfaceDecl::all_protocol_iterator
1830 PI = I->all_referenced_protocol_begin(),
1831 E = I->all_referenced_protocol_end(); PI != E; ++PI)
1832 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl,
1834 // Check class extensions (unnamed categories)
1835 for (const ObjCCategoryDecl *Categories = I->getFirstClassExtension();
1836 Categories; Categories = Categories->getNextClassExtension())
1837 ImplMethodsVsClassMethods(S, IMPDecl,
1838 const_cast<ObjCCategoryDecl*>(Categories),
1840 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl)) {
1841 // For extended class, unimplemented methods in its protocols will
1842 // be reported in the primary class.
1843 if (!C->IsClassExtension()) {
1844 for (ObjCCategoryDecl::protocol_iterator PI = C->protocol_begin(),
1845 E = C->protocol_end(); PI != E; ++PI)
1846 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl,
1847 InsMap, ClsMap, CDecl);
1848 // Report unimplemented properties in the category as well.
1849 // When reporting on missing setter/getters, do not report when
1850 // setter/getter is implemented in category's primary class
1852 if (ObjCInterfaceDecl *ID = C->getClassInterface())
1853 if (ObjCImplDecl *IMP = ID->getImplementation()) {
1854 for (ObjCImplementationDecl::instmeth_iterator
1855 I = IMP->instmeth_begin(), E = IMP->instmeth_end(); I!=E; ++I)
1856 InsMap.insert((*I)->getSelector());
1858 DiagnoseUnimplementedProperties(S, IMPDecl, CDecl, InsMap);
1861 llvm_unreachable("invalid ObjCContainerDecl type.");
1864 /// ActOnForwardClassDeclaration -
1865 Sema::DeclGroupPtrTy
1866 Sema::ActOnForwardClassDeclaration(SourceLocation AtClassLoc,
1867 IdentifierInfo **IdentList,
1868 SourceLocation *IdentLocs,
1870 SmallVector<Decl *, 8> DeclsInGroup;
1871 for (unsigned i = 0; i != NumElts; ++i) {
1872 // Check for another declaration kind with the same name.
1874 = LookupSingleName(TUScope, IdentList[i], IdentLocs[i],
1875 LookupOrdinaryName, ForRedeclaration);
1876 if (PrevDecl && PrevDecl->isTemplateParameter()) {
1877 // Maybe we will complain about the shadowed template parameter.
1878 DiagnoseTemplateParameterShadow(AtClassLoc, PrevDecl);
1879 // Just pretend that we didn't see the previous declaration.
1883 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) {
1884 // GCC apparently allows the following idiom:
1886 // typedef NSObject < XCElementTogglerP > XCElementToggler;
1887 // @class XCElementToggler;
1889 // Here we have chosen to ignore the forward class declaration
1890 // with a warning. Since this is the implied behavior.
1891 TypedefNameDecl *TDD = dyn_cast<TypedefNameDecl>(PrevDecl);
1892 if (!TDD || !TDD->getUnderlyingType()->isObjCObjectType()) {
1893 Diag(AtClassLoc, diag::err_redefinition_different_kind) << IdentList[i];
1894 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
1896 // a forward class declaration matching a typedef name of a class refers
1897 // to the underlying class. Just ignore the forward class with a warning
1898 // as this will force the intended behavior which is to lookup the typedef
1900 if (isa<ObjCObjectType>(TDD->getUnderlyingType())) {
1901 Diag(AtClassLoc, diag::warn_forward_class_redefinition) << IdentList[i];
1902 Diag(PrevDecl->getLocation(), diag::note_previous_definition);
1908 // Create a declaration to describe this forward declaration.
1909 ObjCInterfaceDecl *PrevIDecl
1910 = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl);
1911 ObjCInterfaceDecl *IDecl
1912 = ObjCInterfaceDecl::Create(Context, CurContext, AtClassLoc,
1913 IdentList[i], PrevIDecl, IdentLocs[i]);
1914 IDecl->setAtEndRange(IdentLocs[i]);
1916 PushOnScopeChains(IDecl, TUScope);
1917 CheckObjCDeclScope(IDecl);
1918 DeclsInGroup.push_back(IDecl);
1921 return BuildDeclaratorGroup(DeclsInGroup.data(), DeclsInGroup.size(), false);
1924 static bool tryMatchRecordTypes(ASTContext &Context,
1925 Sema::MethodMatchStrategy strategy,
1926 const Type *left, const Type *right);
1928 static bool matchTypes(ASTContext &Context, Sema::MethodMatchStrategy strategy,
1929 QualType leftQT, QualType rightQT) {
1931 Context.getCanonicalType(leftQT).getUnqualifiedType().getTypePtr();
1933 Context.getCanonicalType(rightQT).getUnqualifiedType().getTypePtr();
1935 if (left == right) return true;
1937 // If we're doing a strict match, the types have to match exactly.
1938 if (strategy == Sema::MMS_strict) return false;
1940 if (left->isIncompleteType() || right->isIncompleteType()) return false;
1942 // Otherwise, use this absurdly complicated algorithm to try to
1943 // validate the basic, low-level compatibility of the two types.
1945 // As a minimum, require the sizes and alignments to match.
1946 if (Context.getTypeInfo(left) != Context.getTypeInfo(right))
1949 // Consider all the kinds of non-dependent canonical types:
1950 // - functions and arrays aren't possible as return and parameter types
1952 // - vector types of equal size can be arbitrarily mixed
1953 if (isa<VectorType>(left)) return isa<VectorType>(right);
1954 if (isa<VectorType>(right)) return false;
1956 // - references should only match references of identical type
1957 // - structs, unions, and Objective-C objects must match more-or-less
1959 // - everything else should be a scalar
1960 if (!left->isScalarType() || !right->isScalarType())
1961 return tryMatchRecordTypes(Context, strategy, left, right);
1963 // Make scalars agree in kind, except count bools as chars, and group
1964 // all non-member pointers together.
1965 Type::ScalarTypeKind leftSK = left->getScalarTypeKind();
1966 Type::ScalarTypeKind rightSK = right->getScalarTypeKind();
1967 if (leftSK == Type::STK_Bool) leftSK = Type::STK_Integral;
1968 if (rightSK == Type::STK_Bool) rightSK = Type::STK_Integral;
1969 if (leftSK == Type::STK_CPointer || leftSK == Type::STK_BlockPointer)
1970 leftSK = Type::STK_ObjCObjectPointer;
1971 if (rightSK == Type::STK_CPointer || rightSK == Type::STK_BlockPointer)
1972 rightSK = Type::STK_ObjCObjectPointer;
1974 // Note that data member pointers and function member pointers don't
1975 // intermix because of the size differences.
1977 return (leftSK == rightSK);
1980 static bool tryMatchRecordTypes(ASTContext &Context,
1981 Sema::MethodMatchStrategy strategy,
1982 const Type *lt, const Type *rt) {
1983 assert(lt && rt && lt != rt);
1985 if (!isa<RecordType>(lt) || !isa<RecordType>(rt)) return false;
1986 RecordDecl *left = cast<RecordType>(lt)->getDecl();
1987 RecordDecl *right = cast<RecordType>(rt)->getDecl();
1989 // Require union-hood to match.
1990 if (left->isUnion() != right->isUnion()) return false;
1992 // Require an exact match if either is non-POD.
1993 if ((isa<CXXRecordDecl>(left) && !cast<CXXRecordDecl>(left)->isPOD()) ||
1994 (isa<CXXRecordDecl>(right) && !cast<CXXRecordDecl>(right)->isPOD()))
1997 // Require size and alignment to match.
1998 if (Context.getTypeInfo(lt) != Context.getTypeInfo(rt)) return false;
2000 // Require fields to match.
2001 RecordDecl::field_iterator li = left->field_begin(), le = left->field_end();
2002 RecordDecl::field_iterator ri = right->field_begin(), re = right->field_end();
2003 for (; li != le && ri != re; ++li, ++ri) {
2004 if (!matchTypes(Context, strategy, li->getType(), ri->getType()))
2007 return (li == le && ri == re);
2010 /// MatchTwoMethodDeclarations - Checks that two methods have matching type and
2011 /// returns true, or false, accordingly.
2012 /// TODO: Handle protocol list; such as id<p1,p2> in type comparisons
2013 bool Sema::MatchTwoMethodDeclarations(const ObjCMethodDecl *left,
2014 const ObjCMethodDecl *right,
2015 MethodMatchStrategy strategy) {
2016 if (!matchTypes(Context, strategy,
2017 left->getResultType(), right->getResultType()))
2020 if (getLangOpts().ObjCAutoRefCount &&
2021 (left->hasAttr<NSReturnsRetainedAttr>()
2022 != right->hasAttr<NSReturnsRetainedAttr>() ||
2023 left->hasAttr<NSConsumesSelfAttr>()
2024 != right->hasAttr<NSConsumesSelfAttr>()))
2027 ObjCMethodDecl::param_const_iterator
2028 li = left->param_begin(), le = left->param_end(), ri = right->param_begin(),
2029 re = right->param_end();
2031 for (; li != le && ri != re; ++li, ++ri) {
2032 assert(ri != right->param_end() && "Param mismatch");
2033 const ParmVarDecl *lparm = *li, *rparm = *ri;
2035 if (!matchTypes(Context, strategy, lparm->getType(), rparm->getType()))
2038 if (getLangOpts().ObjCAutoRefCount &&
2039 lparm->hasAttr<NSConsumedAttr>() != rparm->hasAttr<NSConsumedAttr>())
2045 void Sema::addMethodToGlobalList(ObjCMethodList *List, ObjCMethodDecl *Method) {
2046 // If the list is empty, make it a singleton list.
2047 if (List->Method == 0) {
2048 List->Method = Method;
2053 // We've seen a method with this name, see if we have already seen this type
2055 ObjCMethodList *Previous = List;
2056 for (; List; Previous = List, List = List->Next) {
2057 if (!MatchTwoMethodDeclarations(Method, List->Method))
2060 ObjCMethodDecl *PrevObjCMethod = List->Method;
2062 // Propagate the 'defined' bit.
2063 if (Method->isDefined())
2064 PrevObjCMethod->setDefined(true);
2066 // If a method is deprecated, push it in the global pool.
2067 // This is used for better diagnostics.
2068 if (Method->isDeprecated()) {
2069 if (!PrevObjCMethod->isDeprecated())
2070 List->Method = Method;
2072 // If new method is unavailable, push it into global pool
2073 // unless previous one is deprecated.
2074 if (Method->isUnavailable()) {
2075 if (PrevObjCMethod->getAvailability() < AR_Deprecated)
2076 List->Method = Method;
2082 // We have a new signature for an existing method - add it.
2083 // This is extremely rare. Only 1% of Cocoa selectors are "overloaded".
2084 ObjCMethodList *Mem = BumpAlloc.Allocate<ObjCMethodList>();
2085 Previous->Next = new (Mem) ObjCMethodList(Method, 0);
2088 /// \brief Read the contents of the method pool for a given selector from
2089 /// external storage.
2090 void Sema::ReadMethodPool(Selector Sel) {
2091 assert(ExternalSource && "We need an external AST source");
2092 ExternalSource->ReadMethodPool(Sel);
2095 void Sema::AddMethodToGlobalPool(ObjCMethodDecl *Method, bool impl,
2097 // Ignore methods of invalid containers.
2098 if (cast<Decl>(Method->getDeclContext())->isInvalidDecl())
2102 ReadMethodPool(Method->getSelector());
2104 GlobalMethodPool::iterator Pos = MethodPool.find(Method->getSelector());
2105 if (Pos == MethodPool.end())
2106 Pos = MethodPool.insert(std::make_pair(Method->getSelector(),
2107 GlobalMethods())).first;
2109 Method->setDefined(impl);
2111 ObjCMethodList &Entry = instance ? Pos->second.first : Pos->second.second;
2112 addMethodToGlobalList(&Entry, Method);
2115 /// Determines if this is an "acceptable" loose mismatch in the global
2116 /// method pool. This exists mostly as a hack to get around certain
2117 /// global mismatches which we can't afford to make warnings / errors.
2118 /// Really, what we want is a way to take a method out of the global
2120 static bool isAcceptableMethodMismatch(ObjCMethodDecl *chosen,
2121 ObjCMethodDecl *other) {
2122 if (!chosen->isInstanceMethod())
2125 Selector sel = chosen->getSelector();
2126 if (!sel.isUnarySelector() || sel.getNameForSlot(0) != "length")
2129 // Don't complain about mismatches for -length if the method we
2130 // chose has an integral result type.
2131 return (chosen->getResultType()->isIntegerType());
2134 ObjCMethodDecl *Sema::LookupMethodInGlobalPool(Selector Sel, SourceRange R,
2135 bool receiverIdOrClass,
2136 bool warn, bool instance) {
2138 ReadMethodPool(Sel);
2140 GlobalMethodPool::iterator Pos = MethodPool.find(Sel);
2141 if (Pos == MethodPool.end())
2144 ObjCMethodList &MethList = instance ? Pos->second.first : Pos->second.second;
2146 if (warn && MethList.Method && MethList.Next) {
2147 bool issueDiagnostic = false, issueError = false;
2149 // We support a warning which complains about *any* difference in
2150 // method signature.
2151 bool strictSelectorMatch =
2152 (receiverIdOrClass && warn &&
2153 (Diags.getDiagnosticLevel(diag::warn_strict_multiple_method_decl,
2155 DiagnosticsEngine::Ignored));
2156 if (strictSelectorMatch)
2157 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) {
2158 if (!MatchTwoMethodDeclarations(MethList.Method, Next->Method,
2160 issueDiagnostic = true;
2165 // If we didn't see any strict differences, we won't see any loose
2166 // differences. In ARC, however, we also need to check for loose
2167 // mismatches, because most of them are errors.
2168 if (!strictSelectorMatch ||
2169 (issueDiagnostic && getLangOpts().ObjCAutoRefCount))
2170 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) {
2171 // This checks if the methods differ in type mismatch.
2172 if (!MatchTwoMethodDeclarations(MethList.Method, Next->Method,
2174 !isAcceptableMethodMismatch(MethList.Method, Next->Method)) {
2175 issueDiagnostic = true;
2176 if (getLangOpts().ObjCAutoRefCount)
2182 if (issueDiagnostic) {
2184 Diag(R.getBegin(), diag::err_arc_multiple_method_decl) << Sel << R;
2185 else if (strictSelectorMatch)
2186 Diag(R.getBegin(), diag::warn_strict_multiple_method_decl) << Sel << R;
2188 Diag(R.getBegin(), diag::warn_multiple_method_decl) << Sel << R;
2190 Diag(MethList.Method->getLocStart(),
2191 issueError ? diag::note_possibility : diag::note_using)
2192 << MethList.Method->getSourceRange();
2193 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next)
2194 Diag(Next->Method->getLocStart(), diag::note_also_found)
2195 << Next->Method->getSourceRange();
2198 return MethList.Method;
2201 ObjCMethodDecl *Sema::LookupImplementedMethodInGlobalPool(Selector Sel) {
2202 GlobalMethodPool::iterator Pos = MethodPool.find(Sel);
2203 if (Pos == MethodPool.end())
2206 GlobalMethods &Methods = Pos->second;
2208 if (Methods.first.Method && Methods.first.Method->isDefined())
2209 return Methods.first.Method;
2210 if (Methods.second.Method && Methods.second.Method->isDefined())
2211 return Methods.second.Method;
2215 /// DiagnoseDuplicateIvars -
2216 /// Check for duplicate ivars in the entire class at the start of
2217 /// \@implementation. This becomes necesssary because class extension can
2218 /// add ivars to a class in random order which will not be known until
2219 /// class's \@implementation is seen.
2220 void Sema::DiagnoseDuplicateIvars(ObjCInterfaceDecl *ID,
2221 ObjCInterfaceDecl *SID) {
2222 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(),
2223 IVE = ID->ivar_end(); IVI != IVE; ++IVI) {
2224 ObjCIvarDecl* Ivar = *IVI;
2225 if (Ivar->isInvalidDecl())
2227 if (IdentifierInfo *II = Ivar->getIdentifier()) {
2228 ObjCIvarDecl* prevIvar = SID->lookupInstanceVariable(II);
2230 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II;
2231 Diag(prevIvar->getLocation(), diag::note_previous_declaration);
2232 Ivar->setInvalidDecl();
2238 Sema::ObjCContainerKind Sema::getObjCContainerKind() const {
2239 switch (CurContext->getDeclKind()) {
2240 case Decl::ObjCInterface:
2241 return Sema::OCK_Interface;
2242 case Decl::ObjCProtocol:
2243 return Sema::OCK_Protocol;
2244 case Decl::ObjCCategory:
2245 if (dyn_cast<ObjCCategoryDecl>(CurContext)->IsClassExtension())
2246 return Sema::OCK_ClassExtension;
2248 return Sema::OCK_Category;
2249 case Decl::ObjCImplementation:
2250 return Sema::OCK_Implementation;
2251 case Decl::ObjCCategoryImpl:
2252 return Sema::OCK_CategoryImplementation;
2255 return Sema::OCK_None;
2259 // Note: For class/category implemenations, allMethods/allProperties is
2261 Decl *Sema::ActOnAtEnd(Scope *S, SourceRange AtEnd,
2262 Decl **allMethods, unsigned allNum,
2263 Decl **allProperties, unsigned pNum,
2264 DeclGroupPtrTy *allTUVars, unsigned tuvNum) {
2266 if (getObjCContainerKind() == Sema::OCK_None)
2269 assert(AtEnd.isValid() && "Invalid location for '@end'");
2271 ObjCContainerDecl *OCD = dyn_cast<ObjCContainerDecl>(CurContext);
2272 Decl *ClassDecl = cast<Decl>(OCD);
2274 bool isInterfaceDeclKind =
2275 isa<ObjCInterfaceDecl>(ClassDecl) || isa<ObjCCategoryDecl>(ClassDecl)
2276 || isa<ObjCProtocolDecl>(ClassDecl);
2277 bool checkIdenticalMethods = isa<ObjCImplementationDecl>(ClassDecl);
2279 // FIXME: Remove these and use the ObjCContainerDecl/DeclContext.
2280 llvm::DenseMap<Selector, const ObjCMethodDecl*> InsMap;
2281 llvm::DenseMap<Selector, const ObjCMethodDecl*> ClsMap;
2283 for (unsigned i = 0; i < allNum; i++ ) {
2284 ObjCMethodDecl *Method =
2285 cast_or_null<ObjCMethodDecl>(allMethods[i]);
2287 if (!Method) continue; // Already issued a diagnostic.
2288 if (Method->isInstanceMethod()) {
2289 /// Check for instance method of the same name with incompatible types
2290 const ObjCMethodDecl *&PrevMethod = InsMap[Method->getSelector()];
2291 bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod)
2293 if ((isInterfaceDeclKind && PrevMethod && !match)
2294 || (checkIdenticalMethods && match)) {
2295 Diag(Method->getLocation(), diag::err_duplicate_method_decl)
2296 << Method->getDeclName();
2297 Diag(PrevMethod->getLocation(), diag::note_previous_declaration);
2298 Method->setInvalidDecl();
2301 Method->setAsRedeclaration(PrevMethod);
2302 if (!Context.getSourceManager().isInSystemHeader(
2303 Method->getLocation()))
2304 Diag(Method->getLocation(), diag::warn_duplicate_method_decl)
2305 << Method->getDeclName();
2306 Diag(PrevMethod->getLocation(), diag::note_previous_declaration);
2308 InsMap[Method->getSelector()] = Method;
2309 /// The following allows us to typecheck messages to "id".
2310 AddInstanceMethodToGlobalPool(Method);
2313 /// Check for class method of the same name with incompatible types
2314 const ObjCMethodDecl *&PrevMethod = ClsMap[Method->getSelector()];
2315 bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod)
2317 if ((isInterfaceDeclKind && PrevMethod && !match)
2318 || (checkIdenticalMethods && match)) {
2319 Diag(Method->getLocation(), diag::err_duplicate_method_decl)
2320 << Method->getDeclName();
2321 Diag(PrevMethod->getLocation(), diag::note_previous_declaration);
2322 Method->setInvalidDecl();
2325 Method->setAsRedeclaration(PrevMethod);
2326 if (!Context.getSourceManager().isInSystemHeader(
2327 Method->getLocation()))
2328 Diag(Method->getLocation(), diag::warn_duplicate_method_decl)
2329 << Method->getDeclName();
2330 Diag(PrevMethod->getLocation(), diag::note_previous_declaration);
2332 ClsMap[Method->getSelector()] = Method;
2333 AddFactoryMethodToGlobalPool(Method);
2337 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl>(ClassDecl)) {
2338 // Compares properties declared in this class to those of its
2340 ComparePropertiesInBaseAndSuper(I);
2341 CompareProperties(I, I);
2342 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(ClassDecl)) {
2343 // Categories are used to extend the class by declaring new methods.
2344 // By the same token, they are also used to add new properties. No
2345 // need to compare the added property to those in the class.
2347 // Compare protocol properties with those in category
2348 CompareProperties(C, C);
2349 if (C->IsClassExtension()) {
2350 ObjCInterfaceDecl *CCPrimary = C->getClassInterface();
2351 DiagnoseClassExtensionDupMethods(C, CCPrimary);
2354 if (ObjCContainerDecl *CDecl = dyn_cast<ObjCContainerDecl>(ClassDecl)) {
2355 if (CDecl->getIdentifier())
2356 // ProcessPropertyDecl is responsible for diagnosing conflicts with any
2357 // user-defined setter/getter. It also synthesizes setter/getter methods
2358 // and adds them to the DeclContext and global method pools.
2359 for (ObjCContainerDecl::prop_iterator I = CDecl->prop_begin(),
2360 E = CDecl->prop_end();
2362 ProcessPropertyDecl(*I, CDecl);
2363 CDecl->setAtEndRange(AtEnd);
2365 if (ObjCImplementationDecl *IC=dyn_cast<ObjCImplementationDecl>(ClassDecl)) {
2366 IC->setAtEndRange(AtEnd);
2367 if (ObjCInterfaceDecl* IDecl = IC->getClassInterface()) {
2368 // Any property declared in a class extension might have user
2369 // declared setter or getter in current class extension or one
2370 // of the other class extensions. Mark them as synthesized as
2371 // property will be synthesized when property with same name is
2372 // seen in the @implementation.
2373 for (const ObjCCategoryDecl *ClsExtDecl =
2374 IDecl->getFirstClassExtension();
2375 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) {
2376 for (ObjCContainerDecl::prop_iterator I = ClsExtDecl->prop_begin(),
2377 E = ClsExtDecl->prop_end(); I != E; ++I) {
2378 ObjCPropertyDecl *Property = *I;
2379 // Skip over properties declared @dynamic
2380 if (const ObjCPropertyImplDecl *PIDecl
2381 = IC->FindPropertyImplDecl(Property->getIdentifier()))
2382 if (PIDecl->getPropertyImplementation()
2383 == ObjCPropertyImplDecl::Dynamic)
2386 for (const ObjCCategoryDecl *CExtDecl =
2387 IDecl->getFirstClassExtension();
2388 CExtDecl; CExtDecl = CExtDecl->getNextClassExtension()) {
2389 if (ObjCMethodDecl *GetterMethod =
2390 CExtDecl->getInstanceMethod(Property->getGetterName()))
2391 GetterMethod->setPropertyAccessor(true);
2392 if (!Property->isReadOnly())
2393 if (ObjCMethodDecl *SetterMethod =
2394 CExtDecl->getInstanceMethod(Property->getSetterName()))
2395 SetterMethod->setPropertyAccessor(true);
2399 ImplMethodsVsClassMethods(S, IC, IDecl);
2400 AtomicPropertySetterGetterRules(IC, IDecl);
2401 DiagnoseOwningPropertyGetterSynthesis(IC);
2403 bool HasRootClassAttr = IDecl->hasAttr<ObjCRootClassAttr>();
2404 if (IDecl->getSuperClass() == NULL) {
2405 // This class has no superclass, so check that it has been marked with
2406 // __attribute((objc_root_class)).
2407 if (!HasRootClassAttr) {
2408 SourceLocation DeclLoc(IDecl->getLocation());
2409 SourceLocation SuperClassLoc(PP.getLocForEndOfToken(DeclLoc));
2410 Diag(DeclLoc, diag::warn_objc_root_class_missing)
2411 << IDecl->getIdentifier();
2412 // See if NSObject is in the current scope, and if it is, suggest
2413 // adding " : NSObject " to the class declaration.
2414 NamedDecl *IF = LookupSingleName(TUScope,
2415 NSAPIObj->getNSClassId(NSAPI::ClassId_NSObject),
2416 DeclLoc, LookupOrdinaryName);
2417 ObjCInterfaceDecl *NSObjectDecl = dyn_cast_or_null<ObjCInterfaceDecl>(IF);
2418 if (NSObjectDecl && NSObjectDecl->getDefinition()) {
2419 Diag(SuperClassLoc, diag::note_objc_needs_superclass)
2420 << FixItHint::CreateInsertion(SuperClassLoc, " : NSObject ");
2422 Diag(SuperClassLoc, diag::note_objc_needs_superclass);
2425 } else if (HasRootClassAttr) {
2426 // Complain that only root classes may have this attribute.
2427 Diag(IDecl->getLocation(), diag::err_objc_root_class_subclass);
2430 if (LangOpts.ObjCRuntime.isNonFragile()) {
2431 while (IDecl->getSuperClass()) {
2432 DiagnoseDuplicateIvars(IDecl, IDecl->getSuperClass());
2433 IDecl = IDecl->getSuperClass();
2437 SetIvarInitializers(IC);
2438 } else if (ObjCCategoryImplDecl* CatImplClass =
2439 dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) {
2440 CatImplClass->setAtEndRange(AtEnd);
2442 // Find category interface decl and then check that all methods declared
2443 // in this interface are implemented in the category @implementation.
2444 if (ObjCInterfaceDecl* IDecl = CatImplClass->getClassInterface()) {
2445 for (ObjCCategoryDecl *Categories = IDecl->getCategoryList();
2446 Categories; Categories = Categories->getNextClassCategory()) {
2447 if (Categories->getIdentifier() == CatImplClass->getIdentifier()) {
2448 ImplMethodsVsClassMethods(S, CatImplClass, Categories);
2454 if (isInterfaceDeclKind) {
2455 // Reject invalid vardecls.
2456 for (unsigned i = 0; i != tuvNum; i++) {
2457 DeclGroupRef DG = allTUVars[i].getAsVal<DeclGroupRef>();
2458 for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I)
2459 if (VarDecl *VDecl = dyn_cast<VarDecl>(*I)) {
2460 if (!VDecl->hasExternalStorage())
2461 Diag(VDecl->getLocation(), diag::err_objc_var_decl_inclass);
2465 ActOnObjCContainerFinishDefinition();
2467 for (unsigned i = 0; i != tuvNum; i++) {
2468 DeclGroupRef DG = allTUVars[i].getAsVal<DeclGroupRef>();
2469 for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I)
2470 (*I)->setTopLevelDeclInObjCContainer();
2471 Consumer.HandleTopLevelDeclInObjCContainer(DG);
2474 ActOnDocumentableDecl(ClassDecl);
2479 /// CvtQTToAstBitMask - utility routine to produce an AST bitmask for
2480 /// objective-c's type qualifier from the parser version of the same info.
2481 static Decl::ObjCDeclQualifier
2482 CvtQTToAstBitMask(ObjCDeclSpec::ObjCDeclQualifier PQTVal) {
2483 return (Decl::ObjCDeclQualifier) (unsigned) PQTVal;
2487 unsigned countAlignAttr(const AttrVec &A) {
2489 for (AttrVec::const_iterator i = A.begin(), e = A.end(); i != e; ++i)
2490 if ((*i)->getKind() == attr::Aligned)
2496 bool containsInvalidMethodImplAttribute(ObjCMethodDecl *IMD,
2498 // If method is only declared in implementation (private method),
2499 // No need to issue any diagnostics on method definition with attributes.
2503 // method declared in interface has no attribute.
2504 // But implementation has attributes. This is invalid.
2505 // Except when implementation has 'Align' attribute which is
2506 // immaterial to method declared in interface.
2507 if (!IMD->hasAttrs())
2508 return (A.size() > countAlignAttr(A));
2510 const AttrVec &D = IMD->getAttrs();
2512 unsigned countAlignOnImpl = countAlignAttr(A);
2513 if (!countAlignOnImpl && (A.size() != D.size()))
2515 else if (countAlignOnImpl) {
2516 unsigned countAlignOnDecl = countAlignAttr(D);
2517 if (countAlignOnDecl && (A.size() != D.size()))
2519 else if (!countAlignOnDecl &&
2520 ((A.size()-countAlignOnImpl) != D.size()))
2524 // attributes on method declaration and definition must match exactly.
2525 // Note that we have at most a couple of attributes on methods, so this
2526 // n*n search is good enough.
2527 for (AttrVec::const_iterator i = A.begin(), e = A.end(); i != e; ++i) {
2528 if ((*i)->getKind() == attr::Aligned)
2531 for (AttrVec::const_iterator i1 = D.begin(), e1 = D.end(); i1 != e1; ++i1) {
2532 if ((*i)->getKind() == (*i1)->getKind()) {
2544 /// \brief Check whether the declared result type of the given Objective-C
2545 /// method declaration is compatible with the method's class.
2547 static Sema::ResultTypeCompatibilityKind
2548 CheckRelatedResultTypeCompatibility(Sema &S, ObjCMethodDecl *Method,
2549 ObjCInterfaceDecl *CurrentClass) {
2550 QualType ResultType = Method->getResultType();
2552 // If an Objective-C method inherits its related result type, then its
2553 // declared result type must be compatible with its own class type. The
2554 // declared result type is compatible if:
2555 if (const ObjCObjectPointerType *ResultObjectType
2556 = ResultType->getAs<ObjCObjectPointerType>()) {
2557 // - it is id or qualified id, or
2558 if (ResultObjectType->isObjCIdType() ||
2559 ResultObjectType->isObjCQualifiedIdType())
2560 return Sema::RTC_Compatible;
2563 if (ObjCInterfaceDecl *ResultClass
2564 = ResultObjectType->getInterfaceDecl()) {
2565 // - it is the same as the method's class type, or
2566 if (declaresSameEntity(CurrentClass, ResultClass))
2567 return Sema::RTC_Compatible;
2569 // - it is a superclass of the method's class type
2570 if (ResultClass->isSuperClassOf(CurrentClass))
2571 return Sema::RTC_Compatible;
2574 // Any Objective-C pointer type might be acceptable for a protocol
2575 // method; we just don't know.
2576 return Sema::RTC_Unknown;
2580 return Sema::RTC_Incompatible;
2584 /// A helper class for searching for methods which a particular method
2586 class OverrideSearch {
2589 ObjCMethodDecl *Method;
2590 llvm::SmallPtrSet<ObjCMethodDecl*, 4> Overridden;
2594 OverrideSearch(Sema &S, ObjCMethodDecl *method) : S(S), Method(method) {
2595 Selector selector = method->getSelector();
2597 // Bypass this search if we've never seen an instance/class method
2598 // with this selector before.
2599 Sema::GlobalMethodPool::iterator it = S.MethodPool.find(selector);
2600 if (it == S.MethodPool.end()) {
2601 if (!S.getExternalSource()) return;
2602 S.ReadMethodPool(selector);
2604 it = S.MethodPool.find(selector);
2605 if (it == S.MethodPool.end())
2608 ObjCMethodList &list =
2609 method->isInstanceMethod() ? it->second.first : it->second.second;
2610 if (!list.Method) return;
2612 ObjCContainerDecl *container
2613 = cast<ObjCContainerDecl>(method->getDeclContext());
2615 // Prevent the search from reaching this container again. This is
2616 // important with categories, which override methods from the
2617 // interface and each other.
2618 if (ObjCCategoryDecl *Category = dyn_cast<ObjCCategoryDecl>(container)) {
2619 searchFromContainer(container);
2620 if (ObjCInterfaceDecl *Interface = Category->getClassInterface())
2621 searchFromContainer(Interface);
2623 searchFromContainer(container);
2627 typedef llvm::SmallPtrSet<ObjCMethodDecl*, 128>::iterator iterator;
2628 iterator begin() const { return Overridden.begin(); }
2629 iterator end() const { return Overridden.end(); }
2632 void searchFromContainer(ObjCContainerDecl *container) {
2633 if (container->isInvalidDecl()) return;
2635 switch (container->getDeclKind()) {
2636 #define OBJCCONTAINER(type, base) \
2638 searchFrom(cast<type##Decl>(container)); \
2640 #define ABSTRACT_DECL(expansion)
2641 #define DECL(type, base) \
2643 #include "clang/AST/DeclNodes.inc"
2644 llvm_unreachable("not an ObjC container!");
2648 void searchFrom(ObjCProtocolDecl *protocol) {
2649 if (!protocol->hasDefinition())
2652 // A method in a protocol declaration overrides declarations from
2653 // referenced ("parent") protocols.
2654 search(protocol->getReferencedProtocols());
2657 void searchFrom(ObjCCategoryDecl *category) {
2658 // A method in a category declaration overrides declarations from
2659 // the main class and from protocols the category references.
2660 // The main class is handled in the constructor.
2661 search(category->getReferencedProtocols());
2664 void searchFrom(ObjCCategoryImplDecl *impl) {
2665 // A method in a category definition that has a category
2666 // declaration overrides declarations from the category
2668 if (ObjCCategoryDecl *category = impl->getCategoryDecl()) {
2670 if (ObjCInterfaceDecl *Interface = category->getClassInterface())
2673 // Otherwise it overrides declarations from the class.
2674 } else if (ObjCInterfaceDecl *Interface = impl->getClassInterface()) {
2679 void searchFrom(ObjCInterfaceDecl *iface) {
2680 // A method in a class declaration overrides declarations from
2681 if (!iface->hasDefinition())
2685 for (ObjCCategoryDecl *category = iface->getCategoryList();
2686 category; category = category->getNextClassCategory())
2689 // - the super class, and
2690 if (ObjCInterfaceDecl *super = iface->getSuperClass())
2693 // - any referenced protocols.
2694 search(iface->getReferencedProtocols());
2697 void searchFrom(ObjCImplementationDecl *impl) {
2698 // A method in a class implementation overrides declarations from
2699 // the class interface.
2700 if (ObjCInterfaceDecl *Interface = impl->getClassInterface())
2705 void search(const ObjCProtocolList &protocols) {
2706 for (ObjCProtocolList::iterator i = protocols.begin(), e = protocols.end();
2711 void search(ObjCContainerDecl *container) {
2712 // Check for a method in this container which matches this selector.
2713 ObjCMethodDecl *meth = container->getMethod(Method->getSelector(),
2714 Method->isInstanceMethod());
2716 // If we find one, record it and bail out.
2718 Overridden.insert(meth);
2722 // Otherwise, search for methods that a hypothetical method here
2723 // would have overridden.
2725 // Note that we're now in a recursive case.
2728 searchFromContainer(container);
2733 void Sema::CheckObjCMethodOverrides(ObjCMethodDecl *ObjCMethod,
2734 ObjCInterfaceDecl *CurrentClass,
2735 ResultTypeCompatibilityKind RTC) {
2736 // Search for overridden methods and merge information down from them.
2737 OverrideSearch overrides(*this, ObjCMethod);
2738 // Keep track if the method overrides any method in the class's base classes,
2739 // its protocols, or its categories' protocols; we will keep that info
2740 // in the ObjCMethodDecl.
2741 // For this info, a method in an implementation is not considered as
2742 // overriding the same method in the interface or its categories.
2743 bool hasOverriddenMethodsInBaseOrProtocol = false;
2744 for (OverrideSearch::iterator
2745 i = overrides.begin(), e = overrides.end(); i != e; ++i) {
2746 ObjCMethodDecl *overridden = *i;
2748 if (isa<ObjCProtocolDecl>(overridden->getDeclContext()) ||
2749 CurrentClass != overridden->getClassInterface() ||
2750 overridden->isOverriding())
2751 hasOverriddenMethodsInBaseOrProtocol = true;
2753 // Propagate down the 'related result type' bit from overridden methods.
2754 if (RTC != Sema::RTC_Incompatible && overridden->hasRelatedResultType())
2755 ObjCMethod->SetRelatedResultType();
2757 // Then merge the declarations.
2758 mergeObjCMethodDecls(ObjCMethod, overridden);
2760 if (ObjCMethod->isImplicit() && overridden->isImplicit())
2761 continue; // Conflicting properties are detected elsewhere.
2763 // Check for overriding methods
2764 if (isa<ObjCInterfaceDecl>(ObjCMethod->getDeclContext()) ||
2765 isa<ObjCImplementationDecl>(ObjCMethod->getDeclContext()))
2766 CheckConflictingOverridingMethod(ObjCMethod, overridden,
2767 isa<ObjCProtocolDecl>(overridden->getDeclContext()));
2769 if (CurrentClass && overridden->getDeclContext() != CurrentClass &&
2770 isa<ObjCInterfaceDecl>(overridden->getDeclContext()) &&
2771 !overridden->isImplicit() /* not meant for properties */) {
2772 ObjCMethodDecl::param_iterator ParamI = ObjCMethod->param_begin(),
2773 E = ObjCMethod->param_end();
2774 ObjCMethodDecl::param_iterator PrevI = overridden->param_begin(),
2775 PrevE = overridden->param_end();
2776 for (; ParamI != E && PrevI != PrevE; ++ParamI, ++PrevI) {
2777 assert(PrevI != overridden->param_end() && "Param mismatch");
2778 QualType T1 = Context.getCanonicalType((*ParamI)->getType());
2779 QualType T2 = Context.getCanonicalType((*PrevI)->getType());
2780 // If type of argument of method in this class does not match its
2781 // respective argument type in the super class method, issue warning;
2782 if (!Context.typesAreCompatible(T1, T2)) {
2783 Diag((*ParamI)->getLocation(), diag::ext_typecheck_base_super)
2785 Diag(overridden->getLocation(), diag::note_previous_declaration);
2792 ObjCMethod->setOverriding(hasOverriddenMethodsInBaseOrProtocol);
2795 Decl *Sema::ActOnMethodDeclaration(
2797 SourceLocation MethodLoc, SourceLocation EndLoc,
2798 tok::TokenKind MethodType,
2799 ObjCDeclSpec &ReturnQT, ParsedType ReturnType,
2800 ArrayRef<SourceLocation> SelectorLocs,
2802 // optional arguments. The number of types/arguments is obtained
2803 // from the Sel.getNumArgs().
2804 ObjCArgInfo *ArgInfo,
2805 DeclaratorChunk::ParamInfo *CParamInfo, unsigned CNumArgs, // c-style args
2806 AttributeList *AttrList, tok::ObjCKeywordKind MethodDeclKind,
2807 bool isVariadic, bool MethodDefinition) {
2808 // Make sure we can establish a context for the method.
2809 if (!CurContext->isObjCContainer()) {
2810 Diag(MethodLoc, diag::error_missing_method_context);
2813 ObjCContainerDecl *OCD = dyn_cast<ObjCContainerDecl>(CurContext);
2814 Decl *ClassDecl = cast<Decl>(OCD);
2815 QualType resultDeclType;
2817 bool HasRelatedResultType = false;
2818 TypeSourceInfo *ResultTInfo = 0;
2820 resultDeclType = GetTypeFromParser(ReturnType, &ResultTInfo);
2822 // Methods cannot return interface types. All ObjC objects are
2823 // passed by reference.
2824 if (resultDeclType->isObjCObjectType()) {
2825 Diag(MethodLoc, diag::err_object_cannot_be_passed_returned_by_value)
2826 << 0 << resultDeclType;
2830 HasRelatedResultType = (resultDeclType == Context.getObjCInstanceType());
2831 } else { // get the type for "id".
2832 resultDeclType = Context.getObjCIdType();
2833 Diag(MethodLoc, diag::warn_missing_method_return_type)
2834 << FixItHint::CreateInsertion(SelectorLocs.front(), "(id)");
2837 ObjCMethodDecl* ObjCMethod =
2838 ObjCMethodDecl::Create(Context, MethodLoc, EndLoc, Sel,
2842 MethodType == tok::minus, isVariadic,
2843 /*isPropertyAccessor=*/false,
2844 /*isImplicitlyDeclared=*/false, /*isDefined=*/false,
2845 MethodDeclKind == tok::objc_optional
2846 ? ObjCMethodDecl::Optional
2847 : ObjCMethodDecl::Required,
2848 HasRelatedResultType);
2850 SmallVector<ParmVarDecl*, 16> Params;
2852 for (unsigned i = 0, e = Sel.getNumArgs(); i != e; ++i) {
2856 if (ArgInfo[i].Type == 0) {
2857 ArgType = Context.getObjCIdType();
2860 ArgType = GetTypeFromParser(ArgInfo[i].Type, &DI);
2861 // Perform the default array/function conversions (C99 6.7.5.3p[7,8]).
2862 ArgType = Context.getAdjustedParameterType(ArgType);
2865 LookupResult R(*this, ArgInfo[i].Name, ArgInfo[i].NameLoc,
2866 LookupOrdinaryName, ForRedeclaration);
2868 if (R.isSingleResult()) {
2869 NamedDecl *PrevDecl = R.getFoundDecl();
2870 if (S->isDeclScope(PrevDecl)) {
2871 Diag(ArgInfo[i].NameLoc,
2872 (MethodDefinition ? diag::warn_method_param_redefinition
2873 : diag::warn_method_param_declaration))
2875 Diag(PrevDecl->getLocation(),
2876 diag::note_previous_declaration);
2880 SourceLocation StartLoc = DI
2881 ? DI->getTypeLoc().getBeginLoc()
2882 : ArgInfo[i].NameLoc;
2884 ParmVarDecl* Param = CheckParameter(ObjCMethod, StartLoc,
2885 ArgInfo[i].NameLoc, ArgInfo[i].Name,
2886 ArgType, DI, SC_None, SC_None);
2888 Param->setObjCMethodScopeInfo(i);
2890 Param->setObjCDeclQualifier(
2891 CvtQTToAstBitMask(ArgInfo[i].DeclSpec.getObjCDeclQualifier()));
2893 // Apply the attributes to the parameter.
2894 ProcessDeclAttributeList(TUScope, Param, ArgInfo[i].ArgAttrs);
2896 if (Param->hasAttr<BlocksAttr>()) {
2897 Diag(Param->getLocation(), diag::err_block_on_nonlocal);
2898 Param->setInvalidDecl();
2901 IdResolver.AddDecl(Param);
2903 Params.push_back(Param);
2906 for (unsigned i = 0, e = CNumArgs; i != e; ++i) {
2907 ParmVarDecl *Param = cast<ParmVarDecl>(CParamInfo[i].Param);
2908 QualType ArgType = Param->getType();
2909 if (ArgType.isNull())
2910 ArgType = Context.getObjCIdType();
2912 // Perform the default array/function conversions (C99 6.7.5.3p[7,8]).
2913 ArgType = Context.getAdjustedParameterType(ArgType);
2914 if (ArgType->isObjCObjectType()) {
2915 Diag(Param->getLocation(),
2916 diag::err_object_cannot_be_passed_returned_by_value)
2918 Param->setInvalidDecl();
2920 Param->setDeclContext(ObjCMethod);
2922 Params.push_back(Param);
2925 ObjCMethod->setMethodParams(Context, Params, SelectorLocs);
2926 ObjCMethod->setObjCDeclQualifier(
2927 CvtQTToAstBitMask(ReturnQT.getObjCDeclQualifier()));
2930 ProcessDeclAttributeList(TUScope, ObjCMethod, AttrList);
2932 // Add the method now.
2933 const ObjCMethodDecl *PrevMethod = 0;
2934 if (ObjCImplDecl *ImpDecl = dyn_cast<ObjCImplDecl>(ClassDecl)) {
2935 if (MethodType == tok::minus) {
2936 PrevMethod = ImpDecl->getInstanceMethod(Sel);
2937 ImpDecl->addInstanceMethod(ObjCMethod);
2939 PrevMethod = ImpDecl->getClassMethod(Sel);
2940 ImpDecl->addClassMethod(ObjCMethod);
2943 ObjCMethodDecl *IMD = 0;
2944 if (ObjCInterfaceDecl *IDecl = ImpDecl->getClassInterface())
2945 IMD = IDecl->lookupMethod(ObjCMethod->getSelector(),
2946 ObjCMethod->isInstanceMethod());
2947 if (ObjCMethod->hasAttrs() &&
2948 containsInvalidMethodImplAttribute(IMD, ObjCMethod->getAttrs())) {
2949 SourceLocation MethodLoc = IMD->getLocation();
2950 if (!getSourceManager().isInSystemHeader(MethodLoc)) {
2951 Diag(EndLoc, diag::warn_attribute_method_def);
2952 Diag(MethodLoc, diag::note_method_declared_at)
2953 << ObjCMethod->getDeclName();
2957 cast<DeclContext>(ClassDecl)->addDecl(ObjCMethod);
2961 // You can never have two method definitions with the same name.
2962 Diag(ObjCMethod->getLocation(), diag::err_duplicate_method_decl)
2963 << ObjCMethod->getDeclName();
2964 Diag(PrevMethod->getLocation(), diag::note_previous_declaration);
2967 // If this Objective-C method does not have a related result type, but we
2968 // are allowed to infer related result types, try to do so based on the
2970 ObjCInterfaceDecl *CurrentClass = dyn_cast<ObjCInterfaceDecl>(ClassDecl);
2971 if (!CurrentClass) {
2972 if (ObjCCategoryDecl *Cat = dyn_cast<ObjCCategoryDecl>(ClassDecl))
2973 CurrentClass = Cat->getClassInterface();
2974 else if (ObjCImplDecl *Impl = dyn_cast<ObjCImplDecl>(ClassDecl))
2975 CurrentClass = Impl->getClassInterface();
2976 else if (ObjCCategoryImplDecl *CatImpl
2977 = dyn_cast<ObjCCategoryImplDecl>(ClassDecl))
2978 CurrentClass = CatImpl->getClassInterface();
2981 ResultTypeCompatibilityKind RTC
2982 = CheckRelatedResultTypeCompatibility(*this, ObjCMethod, CurrentClass);
2984 CheckObjCMethodOverrides(ObjCMethod, CurrentClass, RTC);
2986 bool ARCError = false;
2987 if (getLangOpts().ObjCAutoRefCount)
2988 ARCError = CheckARCMethodDecl(*this, ObjCMethod);
2990 // Infer the related result type when possible.
2991 if (!ARCError && RTC == Sema::RTC_Compatible &&
2992 !ObjCMethod->hasRelatedResultType() &&
2993 LangOpts.ObjCInferRelatedResultType) {
2994 bool InferRelatedResultType = false;
2995 switch (ObjCMethod->getMethodFamily()) {
3000 case OMF_mutableCopy:
3002 case OMF_retainCount:
3003 case OMF_performSelector:
3008 InferRelatedResultType = ObjCMethod->isClassMethod();
3012 case OMF_autorelease:
3015 InferRelatedResultType = ObjCMethod->isInstanceMethod();
3019 if (InferRelatedResultType)
3020 ObjCMethod->SetRelatedResultType();
3023 ActOnDocumentableDecl(ObjCMethod);
3028 bool Sema::CheckObjCDeclScope(Decl *D) {
3029 // Following is also an error. But it is caused by a missing @end
3030 // and diagnostic is issued elsewhere.
3031 if (isa<ObjCContainerDecl>(CurContext->getRedeclContext()))
3034 // If we switched context to translation unit while we are still lexically in
3035 // an objc container, it means the parser missed emitting an error.
3036 if (isa<TranslationUnitDecl>(getCurLexicalContext()->getRedeclContext()))
3039 Diag(D->getLocation(), diag::err_objc_decls_may_only_appear_in_global_scope);
3040 D->setInvalidDecl();
3045 /// Called whenever \@defs(ClassName) is encountered in the source. Inserts the
3046 /// instance variables of ClassName into Decls.
3047 void Sema::ActOnDefs(Scope *S, Decl *TagD, SourceLocation DeclStart,
3048 IdentifierInfo *ClassName,
3049 SmallVectorImpl<Decl*> &Decls) {
3050 // Check that ClassName is a valid class
3051 ObjCInterfaceDecl *Class = getObjCInterfaceDecl(ClassName, DeclStart);
3053 Diag(DeclStart, diag::err_undef_interface) << ClassName;
3056 if (LangOpts.ObjCRuntime.isNonFragile()) {
3057 Diag(DeclStart, diag::err_atdef_nonfragile_interface);
3061 // Collect the instance variables
3062 SmallVector<const ObjCIvarDecl*, 32> Ivars;
3063 Context.DeepCollectObjCIvars(Class, true, Ivars);
3064 // For each ivar, create a fresh ObjCAtDefsFieldDecl.
3065 for (unsigned i = 0; i < Ivars.size(); i++) {
3066 const FieldDecl* ID = cast<FieldDecl>(Ivars[i]);
3067 RecordDecl *Record = dyn_cast<RecordDecl>(TagD);
3068 Decl *FD = ObjCAtDefsFieldDecl::Create(Context, Record,
3069 /*FIXME: StartL=*/ID->getLocation(),
3071 ID->getIdentifier(), ID->getType(),
3073 Decls.push_back(FD);
3076 // Introduce all of these fields into the appropriate scope.
3077 for (SmallVectorImpl<Decl*>::iterator D = Decls.begin();
3078 D != Decls.end(); ++D) {
3079 FieldDecl *FD = cast<FieldDecl>(*D);
3080 if (getLangOpts().CPlusPlus)
3081 PushOnScopeChains(cast<FieldDecl>(FD), S);
3082 else if (RecordDecl *Record = dyn_cast<RecordDecl>(TagD))
3083 Record->addDecl(FD);
3087 /// \brief Build a type-check a new Objective-C exception variable declaration.
3088 VarDecl *Sema::BuildObjCExceptionDecl(TypeSourceInfo *TInfo, QualType T,
3089 SourceLocation StartLoc,
3090 SourceLocation IdLoc,
3093 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage
3094 // duration shall not be qualified by an address-space qualifier."
3095 // Since all parameters have automatic store duration, they can not have
3096 // an address space.
3097 if (T.getAddressSpace() != 0) {
3098 Diag(IdLoc, diag::err_arg_with_address_space);
3102 // An @catch parameter must be an unqualified object pointer type;
3103 // FIXME: Recover from "NSObject foo" by inserting the * in "NSObject *foo"?
3105 // Don't do any further checking.
3106 } else if (T->isDependentType()) {
3107 // Okay: we don't know what this type will instantiate to.
3108 } else if (!T->isObjCObjectPointerType()) {
3110 Diag(IdLoc ,diag::err_catch_param_not_objc_type);
3111 } else if (T->isObjCQualifiedIdType()) {
3113 Diag(IdLoc, diag::err_illegal_qualifiers_on_catch_parm);
3116 VarDecl *New = VarDecl::Create(Context, CurContext, StartLoc, IdLoc, Id,
3117 T, TInfo, SC_None, SC_None);
3118 New->setExceptionVariable(true);
3120 // In ARC, infer 'retaining' for variables of retainable type.
3121 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(New))
3125 New->setInvalidDecl();
3129 Decl *Sema::ActOnObjCExceptionDecl(Scope *S, Declarator &D) {
3130 const DeclSpec &DS = D.getDeclSpec();
3132 // We allow the "register" storage class on exception variables because
3133 // GCC did, but we drop it completely. Any other storage class is an error.
3134 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) {
3135 Diag(DS.getStorageClassSpecLoc(), diag::warn_register_objc_catch_parm)
3136 << FixItHint::CreateRemoval(SourceRange(DS.getStorageClassSpecLoc()));
3137 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) {
3138 Diag(DS.getStorageClassSpecLoc(), diag::err_storage_spec_on_catch_parm)
3139 << DS.getStorageClassSpec();
3141 if (D.getDeclSpec().isThreadSpecified())
3142 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread);
3143 D.getMutableDeclSpec().ClearStorageClassSpecs();
3145 DiagnoseFunctionSpecifiers(D);
3147 // Check that there are no default arguments inside the type of this
3148 // exception object (C++ only).
3149 if (getLangOpts().CPlusPlus)
3150 CheckExtraCXXDefaultArguments(D);
3152 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S);
3153 QualType ExceptionType = TInfo->getType();
3155 VarDecl *New = BuildObjCExceptionDecl(TInfo, ExceptionType,
3156 D.getSourceRange().getBegin(),
3157 D.getIdentifierLoc(),
3161 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1).
3162 if (D.getCXXScopeSpec().isSet()) {
3163 Diag(D.getIdentifierLoc(), diag::err_qualified_objc_catch_parm)
3164 << D.getCXXScopeSpec().getRange();
3165 New->setInvalidDecl();
3168 // Add the parameter declaration into this scope.
3170 if (D.getIdentifier())
3171 IdResolver.AddDecl(New);
3173 ProcessDeclAttributes(S, New, D);
3175 if (New->hasAttr<BlocksAttr>())
3176 Diag(New->getLocation(), diag::err_block_on_nonlocal);
3180 /// CollectIvarsToConstructOrDestruct - Collect those ivars which require
3182 void Sema::CollectIvarsToConstructOrDestruct(ObjCInterfaceDecl *OI,
3183 SmallVectorImpl<ObjCIvarDecl*> &Ivars) {
3184 for (ObjCIvarDecl *Iv = OI->all_declared_ivar_begin(); Iv;
3185 Iv= Iv->getNextIvar()) {
3186 QualType QT = Context.getBaseElementType(Iv->getType());
3187 if (QT->isRecordType())
3188 Ivars.push_back(Iv);
3192 void Sema::DiagnoseUseOfUnimplementedSelectors() {
3193 // Load referenced selectors from the external source.
3194 if (ExternalSource) {
3195 SmallVector<std::pair<Selector, SourceLocation>, 4> Sels;
3196 ExternalSource->ReadReferencedSelectors(Sels);
3197 for (unsigned I = 0, N = Sels.size(); I != N; ++I)
3198 ReferencedSelectors[Sels[I].first] = Sels[I].second;
3201 // Warning will be issued only when selector table is
3202 // generated (which means there is at lease one implementation
3203 // in the TU). This is to match gcc's behavior.
3204 if (ReferencedSelectors.empty() ||
3205 !Context.AnyObjCImplementation())
3207 for (llvm::DenseMap<Selector, SourceLocation>::iterator S =
3208 ReferencedSelectors.begin(),
3209 E = ReferencedSelectors.end(); S != E; ++S) {
3210 Selector Sel = (*S).first;
3211 if (!LookupImplementedMethodInGlobalPool(Sel))
3212 Diag((*S).second, diag::warn_unimplemented_selector) << Sel;