1 //===--- SemaExprObjC.cpp - Semantic Analysis for ObjC Expressions --------===//
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 expressions.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Sema/SemaInternal.h"
15 #include "clang/Sema/Lookup.h"
16 #include "clang/Sema/Scope.h"
17 #include "clang/Sema/ScopeInfo.h"
18 #include "clang/Sema/Initialization.h"
19 #include "clang/AST/ASTContext.h"
20 #include "clang/AST/DeclObjC.h"
21 #include "clang/AST/ExprObjC.h"
22 #include "clang/AST/StmtVisitor.h"
23 #include "clang/AST/TypeLoc.h"
24 #include "llvm/ADT/SmallString.h"
25 #include "clang/Lex/Preprocessor.h"
27 using namespace clang;
30 ExprResult Sema::ParseObjCStringLiteral(SourceLocation *AtLocs,
32 unsigned NumStrings) {
33 StringLiteral **Strings = reinterpret_cast<StringLiteral**>(strings);
35 // Most ObjC strings are formed out of a single piece. However, we *can*
36 // have strings formed out of multiple @ strings with multiple pptokens in
37 // each one, e.g. @"foo" "bar" @"baz" "qux" which need to be turned into one
38 // StringLiteral for ObjCStringLiteral to hold onto.
39 StringLiteral *S = Strings[0];
41 // If we have a multi-part string, merge it all together.
42 if (NumStrings != 1) {
43 // Concatenate objc strings.
44 llvm::SmallString<128> StrBuf;
45 llvm::SmallVector<SourceLocation, 8> StrLocs;
47 for (unsigned i = 0; i != NumStrings; ++i) {
50 // ObjC strings can't be wide.
52 Diag(S->getLocStart(), diag::err_cfstring_literal_not_string_constant)
53 << S->getSourceRange();
58 StrBuf += S->getString();
60 // Get the locations of the string tokens.
61 StrLocs.append(S->tokloc_begin(), S->tokloc_end());
64 // Create the aggregate string with the appropriate content and location
66 S = StringLiteral::Create(Context, StrBuf,
67 /*Wide=*/false, /*Pascal=*/false,
68 Context.getPointerType(Context.CharTy),
69 &StrLocs[0], StrLocs.size());
72 // Verify that this composite string is acceptable for ObjC strings.
73 if (CheckObjCString(S))
76 // Initialize the constant string interface lazily. This assumes
77 // the NSString interface is seen in this translation unit. Note: We
78 // don't use NSConstantString, since the runtime team considers this
79 // interface private (even though it appears in the header files).
80 QualType Ty = Context.getObjCConstantStringInterface();
82 Ty = Context.getObjCObjectPointerType(Ty);
83 } else if (getLangOptions().NoConstantCFStrings) {
84 IdentifierInfo *NSIdent=0;
85 std::string StringClass(getLangOptions().ObjCConstantStringClass);
87 if (StringClass.empty())
88 NSIdent = &Context.Idents.get("NSConstantString");
90 NSIdent = &Context.Idents.get(StringClass);
92 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLocs[0],
94 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
95 Context.setObjCConstantStringInterface(StrIF);
96 Ty = Context.getObjCConstantStringInterface();
97 Ty = Context.getObjCObjectPointerType(Ty);
99 // If there is no NSConstantString interface defined then treat this
100 // as error and recover from it.
101 Diag(S->getLocStart(), diag::err_no_nsconstant_string_class) << NSIdent
102 << S->getSourceRange();
103 Ty = Context.getObjCIdType();
106 IdentifierInfo *NSIdent = &Context.Idents.get("NSString");
107 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLocs[0],
109 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
110 Context.setObjCConstantStringInterface(StrIF);
111 Ty = Context.getObjCConstantStringInterface();
112 Ty = Context.getObjCObjectPointerType(Ty);
114 // If there is no NSString interface defined then treat constant
115 // strings as untyped objects and let the runtime figure it out later.
116 Ty = Context.getObjCIdType();
120 return new (Context) ObjCStringLiteral(S, Ty, AtLocs[0]);
123 ExprResult Sema::BuildObjCEncodeExpression(SourceLocation AtLoc,
124 TypeSourceInfo *EncodedTypeInfo,
125 SourceLocation RParenLoc) {
126 QualType EncodedType = EncodedTypeInfo->getType();
128 if (EncodedType->isDependentType())
129 StrTy = Context.DependentTy;
131 if (!EncodedType->getAsArrayTypeUnsafe() && //// Incomplete array is handled.
132 !EncodedType->isVoidType()) // void is handled too.
133 if (RequireCompleteType(AtLoc, EncodedType,
134 PDiag(diag::err_incomplete_type_objc_at_encode)
135 << EncodedTypeInfo->getTypeLoc().getSourceRange()))
139 Context.getObjCEncodingForType(EncodedType, Str);
141 // The type of @encode is the same as the type of the corresponding string,
142 // which is an array type.
143 StrTy = Context.CharTy;
144 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
145 if (getLangOptions().CPlusPlus || getLangOptions().ConstStrings)
147 StrTy = Context.getConstantArrayType(StrTy, llvm::APInt(32, Str.size()+1),
148 ArrayType::Normal, 0);
151 return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc);
154 ExprResult Sema::ParseObjCEncodeExpression(SourceLocation AtLoc,
155 SourceLocation EncodeLoc,
156 SourceLocation LParenLoc,
158 SourceLocation RParenLoc) {
159 // FIXME: Preserve type source info ?
160 TypeSourceInfo *TInfo;
161 QualType EncodedType = GetTypeFromParser(ty, &TInfo);
163 TInfo = Context.getTrivialTypeSourceInfo(EncodedType,
164 PP.getLocForEndOfToken(LParenLoc));
166 return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc);
169 ExprResult Sema::ParseObjCSelectorExpression(Selector Sel,
170 SourceLocation AtLoc,
171 SourceLocation SelLoc,
172 SourceLocation LParenLoc,
173 SourceLocation RParenLoc) {
174 ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel,
175 SourceRange(LParenLoc, RParenLoc), false, false);
177 Method = LookupFactoryMethodInGlobalPool(Sel,
178 SourceRange(LParenLoc, RParenLoc));
180 Diag(SelLoc, diag::warn_undeclared_selector) << Sel;
183 Method->getImplementationControl() != ObjCMethodDecl::Optional) {
184 llvm::DenseMap<Selector, SourceLocation>::iterator Pos
185 = ReferencedSelectors.find(Sel);
186 if (Pos == ReferencedSelectors.end())
187 ReferencedSelectors.insert(std::make_pair(Sel, SelLoc));
190 // In ARC, forbid the user from using @selector for
191 // retain/release/autorelease/dealloc/retainCount.
192 if (getLangOptions().ObjCAutoRefCount) {
193 switch (Sel.getMethodFamily()) {
196 case OMF_autorelease:
197 case OMF_retainCount:
199 Diag(AtLoc, diag::err_arc_illegal_selector) <<
200 Sel << SourceRange(LParenLoc, RParenLoc);
207 case OMF_mutableCopy:
210 case OMF_performSelector:
214 QualType Ty = Context.getObjCSelType();
215 return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc);
218 ExprResult Sema::ParseObjCProtocolExpression(IdentifierInfo *ProtocolId,
219 SourceLocation AtLoc,
220 SourceLocation ProtoLoc,
221 SourceLocation LParenLoc,
222 SourceLocation RParenLoc) {
223 ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoLoc);
225 Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId;
229 QualType Ty = Context.getObjCProtoType();
232 Ty = Context.getObjCObjectPointerType(Ty);
233 return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, RParenLoc);
236 /// Try to capture an implicit reference to 'self'.
237 ObjCMethodDecl *Sema::tryCaptureObjCSelf() {
238 // Ignore block scopes: we can capture through them.
239 DeclContext *DC = CurContext;
241 if (isa<BlockDecl>(DC)) DC = cast<BlockDecl>(DC)->getDeclContext();
242 else if (isa<EnumDecl>(DC)) DC = cast<EnumDecl>(DC)->getDeclContext();
246 // If we're not in an ObjC method, error out. Note that, unlike the
247 // C++ case, we don't require an instance method --- class methods
248 // still have a 'self', and we really do still need to capture it!
249 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(DC);
253 ImplicitParamDecl *self = method->getSelfDecl();
254 assert(self && "capturing 'self' in non-definition?");
256 // Mark that we're closing on 'this' in all the block scopes, if applicable.
257 for (unsigned idx = FunctionScopes.size() - 1;
258 isa<BlockScopeInfo>(FunctionScopes[idx]);
260 BlockScopeInfo *blockScope = cast<BlockScopeInfo>(FunctionScopes[idx]);
261 unsigned &captureIndex = blockScope->CaptureMap[self];
262 if (captureIndex) break;
264 bool nested = isa<BlockScopeInfo>(FunctionScopes[idx-1]);
265 blockScope->Captures.push_back(
266 BlockDecl::Capture(self, /*byref*/ false, nested, /*copy*/ 0));
267 captureIndex = blockScope->Captures.size(); // +1
273 QualType Sema::getMessageSendResultType(QualType ReceiverType,
274 ObjCMethodDecl *Method,
275 bool isClassMessage, bool isSuperMessage) {
276 assert(Method && "Must have a method");
277 if (!Method->hasRelatedResultType())
278 return Method->getSendResultType();
280 // If a method has a related return type:
281 // - if the method found is an instance method, but the message send
282 // was a class message send, T is the declared return type of the method
284 if (Method->isInstanceMethod() && isClassMessage)
285 return Method->getSendResultType();
287 // - if the receiver is super, T is a pointer to the class of the
288 // enclosing method definition
289 if (isSuperMessage) {
290 if (ObjCMethodDecl *CurMethod = getCurMethodDecl())
291 if (ObjCInterfaceDecl *Class = CurMethod->getClassInterface())
292 return Context.getObjCObjectPointerType(
293 Context.getObjCInterfaceType(Class));
296 // - if the receiver is the name of a class U, T is a pointer to U
297 if (ReceiverType->getAs<ObjCInterfaceType>() ||
298 ReceiverType->isObjCQualifiedInterfaceType())
299 return Context.getObjCObjectPointerType(ReceiverType);
300 // - if the receiver is of type Class or qualified Class type,
301 // T is the declared return type of the method.
302 if (ReceiverType->isObjCClassType() ||
303 ReceiverType->isObjCQualifiedClassType())
304 return Method->getSendResultType();
306 // - if the receiver is id, qualified id, Class, or qualified Class, T
307 // is the receiver type, otherwise
308 // - T is the type of the receiver expression.
312 void Sema::EmitRelatedResultTypeNote(const Expr *E) {
313 E = E->IgnoreParenImpCasts();
314 const ObjCMessageExpr *MsgSend = dyn_cast<ObjCMessageExpr>(E);
318 const ObjCMethodDecl *Method = MsgSend->getMethodDecl();
322 if (!Method->hasRelatedResultType())
325 if (Context.hasSameUnqualifiedType(Method->getResultType()
326 .getNonReferenceType(),
330 Diag(Method->getLocation(), diag::note_related_result_type_inferred)
331 << Method->isInstanceMethod() << Method->getSelector()
332 << MsgSend->getType();
335 bool Sema::CheckMessageArgumentTypes(QualType ReceiverType,
336 Expr **Args, unsigned NumArgs,
337 Selector Sel, ObjCMethodDecl *Method,
338 bool isClassMessage, bool isSuperMessage,
339 SourceLocation lbrac, SourceLocation rbrac,
340 QualType &ReturnType, ExprValueKind &VK) {
342 // Apply default argument promotion as for (C99 6.5.2.2p6).
343 for (unsigned i = 0; i != NumArgs; i++) {
344 if (Args[i]->isTypeDependent())
347 ExprResult Result = DefaultArgumentPromotion(Args[i]);
348 if (Result.isInvalid())
350 Args[i] = Result.take();
354 if (getLangOptions().ObjCAutoRefCount)
355 DiagID = diag::err_arc_method_not_found;
357 DiagID = isClassMessage ? diag::warn_class_method_not_found
358 : diag::warn_inst_method_not_found;
360 << Sel << isClassMessage << SourceRange(lbrac, rbrac);
362 // In debuggers, we want to use __unknown_anytype for these
363 // results so that clients can cast them.
364 if (getLangOptions().DebuggerSupport) {
365 ReturnType = Context.UnknownAnyTy;
367 ReturnType = Context.getObjCIdType();
373 ReturnType = getMessageSendResultType(ReceiverType, Method, isClassMessage,
375 VK = Expr::getValueKindForType(Method->getResultType());
377 unsigned NumNamedArgs = Sel.getNumArgs();
378 // Method might have more arguments than selector indicates. This is due
379 // to addition of c-style arguments in method.
380 if (Method->param_size() > Sel.getNumArgs())
381 NumNamedArgs = Method->param_size();
382 // FIXME. This need be cleaned up.
383 if (NumArgs < NumNamedArgs) {
384 Diag(lbrac, diag::err_typecheck_call_too_few_args)
385 << 2 << NumNamedArgs << NumArgs;
389 bool IsError = false;
390 for (unsigned i = 0; i < NumNamedArgs; i++) {
391 // We can't do any type-checking on a type-dependent argument.
392 if (Args[i]->isTypeDependent())
395 Expr *argExpr = Args[i];
397 ParmVarDecl *Param = Method->param_begin()[i];
398 assert(argExpr && "CheckMessageArgumentTypes(): missing expression");
400 if (RequireCompleteType(argExpr->getSourceRange().getBegin(),
402 PDiag(diag::err_call_incomplete_argument)
403 << argExpr->getSourceRange()))
406 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
408 ExprResult ArgE = PerformCopyInitialization(Entity, lbrac, Owned(argExpr));
409 if (ArgE.isInvalid())
412 Args[i] = ArgE.takeAs<Expr>();
415 // Promote additional arguments to variadic methods.
416 if (Method->isVariadic()) {
417 for (unsigned i = NumNamedArgs; i < NumArgs; ++i) {
418 if (Args[i]->isTypeDependent())
421 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod, 0);
422 IsError |= Arg.isInvalid();
423 Args[i] = Arg.take();
426 // Check for extra arguments to non-variadic methods.
427 if (NumArgs != NumNamedArgs) {
428 Diag(Args[NumNamedArgs]->getLocStart(),
429 diag::err_typecheck_call_too_many_args)
430 << 2 /*method*/ << NumNamedArgs << NumArgs
431 << Method->getSourceRange()
432 << SourceRange(Args[NumNamedArgs]->getLocStart(),
433 Args[NumArgs-1]->getLocEnd());
436 // diagnose nonnull arguments.
437 for (specific_attr_iterator<NonNullAttr>
438 i = Method->specific_attr_begin<NonNullAttr>(),
439 e = Method->specific_attr_end<NonNullAttr>(); i != e; ++i) {
440 CheckNonNullArguments(*i, Args, lbrac);
443 DiagnoseSentinelCalls(Method, lbrac, Args, NumArgs);
447 bool Sema::isSelfExpr(Expr *receiver) {
448 // 'self' is objc 'self' in an objc method only.
449 DeclContext *DC = CurContext;
450 while (isa<BlockDecl>(DC))
451 DC = DC->getParent();
452 if (DC && !isa<ObjCMethodDecl>(DC))
454 receiver = receiver->IgnoreParenLValueCasts();
455 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(receiver))
456 if (DRE->getDecl()->getIdentifier() == &Context.Idents.get("self"))
461 // Helper method for ActOnClassMethod/ActOnInstanceMethod.
462 // Will search "local" class/category implementations for a method decl.
463 // If failed, then we search in class's root for an instance method.
464 // Returns 0 if no method is found.
465 ObjCMethodDecl *Sema::LookupPrivateClassMethod(Selector Sel,
466 ObjCInterfaceDecl *ClassDecl) {
467 ObjCMethodDecl *Method = 0;
468 // lookup in class and all superclasses
469 while (ClassDecl && !Method) {
470 if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation())
471 Method = ImpDecl->getClassMethod(Sel);
473 // Look through local category implementations associated with the class.
475 Method = ClassDecl->getCategoryClassMethod(Sel);
477 // Before we give up, check if the selector is an instance method.
478 // But only in the root. This matches gcc's behaviour and what the
480 if (!Method && !ClassDecl->getSuperClass()) {
481 Method = ClassDecl->lookupInstanceMethod(Sel);
482 // Look through local category implementations associated
483 // with the root class.
485 Method = LookupPrivateInstanceMethod(Sel, ClassDecl);
488 ClassDecl = ClassDecl->getSuperClass();
493 ObjCMethodDecl *Sema::LookupPrivateInstanceMethod(Selector Sel,
494 ObjCInterfaceDecl *ClassDecl) {
495 ObjCMethodDecl *Method = 0;
496 while (ClassDecl && !Method) {
497 // If we have implementations in scope, check "private" methods.
498 if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation())
499 Method = ImpDecl->getInstanceMethod(Sel);
501 // Look through local category implementations associated with the class.
503 Method = ClassDecl->getCategoryInstanceMethod(Sel);
504 ClassDecl = ClassDecl->getSuperClass();
509 /// LookupMethodInQualifiedType - Lookups up a method in protocol qualifier
510 /// list of a qualified objective pointer type.
511 ObjCMethodDecl *Sema::LookupMethodInQualifiedType(Selector Sel,
512 const ObjCObjectPointerType *OPT,
515 ObjCMethodDecl *MD = 0;
516 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(),
517 E = OPT->qual_end(); I != E; ++I) {
518 ObjCProtocolDecl *PROTO = (*I);
519 if ((MD = PROTO->lookupMethod(Sel, Instance))) {
526 /// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an
527 /// objective C interface. This is a property reference expression.
529 HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT,
530 Expr *BaseExpr, SourceLocation OpLoc,
531 DeclarationName MemberName,
532 SourceLocation MemberLoc,
533 SourceLocation SuperLoc, QualType SuperType,
535 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType();
536 ObjCInterfaceDecl *IFace = IFaceT->getDecl();
538 if (MemberName.getNameKind() != DeclarationName::Identifier) {
539 Diag(MemberLoc, diag::err_invalid_property_name)
540 << MemberName << QualType(OPT, 0);
544 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
546 if (IFace->isForwardDecl()) {
547 Diag(MemberLoc, diag::err_property_not_found_forward_class)
548 << MemberName << QualType(OPT, 0);
549 Diag(IFace->getLocation(), diag::note_forward_class);
552 // Search for a declared property first.
553 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Member)) {
554 // Check whether we can reference this property.
555 if (DiagnoseUseOfDecl(PD, MemberLoc))
557 QualType ResTy = PD->getType();
558 ResTy = ResTy.getNonLValueExprType(Context);
559 Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
560 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
562 (Getter->hasRelatedResultType()
563 || DiagnosePropertyAccessorMismatch(PD, Getter, MemberLoc)))
564 ResTy = getMessageSendResultType(QualType(OPT, 0), Getter, false,
568 return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy,
569 VK_LValue, OK_ObjCProperty,
571 SuperLoc, SuperType));
573 return Owned(new (Context) ObjCPropertyRefExpr(PD, ResTy,
574 VK_LValue, OK_ObjCProperty,
575 MemberLoc, BaseExpr));
577 // Check protocols on qualified interfaces.
578 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(),
579 E = OPT->qual_end(); I != E; ++I)
580 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) {
581 // Check whether we can reference this property.
582 if (DiagnoseUseOfDecl(PD, MemberLoc))
585 QualType T = PD->getType();
586 if (ObjCMethodDecl *Getter = PD->getGetterMethodDecl())
587 T = getMessageSendResultType(QualType(OPT, 0), Getter, false, Super);
589 return Owned(new (Context) ObjCPropertyRefExpr(PD, T,
593 SuperLoc, SuperType));
595 return Owned(new (Context) ObjCPropertyRefExpr(PD, T,
601 // If that failed, look for an "implicit" property by seeing if the nullary
602 // selector is implemented.
604 // FIXME: The logic for looking up nullary and unary selectors should be
605 // shared with the code in ActOnInstanceMessage.
607 Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
608 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
610 // May be founf in property's qualified list.
612 Getter = LookupMethodInQualifiedType(Sel, OPT, true);
614 // If this reference is in an @implementation, check for 'private' methods.
616 Getter = IFace->lookupPrivateMethod(Sel);
618 // Look through local category implementations associated with the class.
620 Getter = IFace->getCategoryInstanceMethod(Sel);
622 // Check if we can reference this property.
623 if (DiagnoseUseOfDecl(Getter, MemberLoc))
626 // If we found a getter then this may be a valid dot-reference, we
627 // will look for the matching setter, in case it is needed.
629 SelectorTable::constructSetterName(PP.getIdentifierTable(),
630 PP.getSelectorTable(), Member);
631 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel);
633 // May be founf in property's qualified list.
635 Setter = LookupMethodInQualifiedType(SetterSel, OPT, true);
638 // If this reference is in an @implementation, also check for 'private'
640 Setter = IFace->lookupPrivateMethod(SetterSel);
642 // Look through local category implementations associated with the class.
644 Setter = IFace->getCategoryInstanceMethod(SetterSel);
646 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
649 if (Getter || Setter) {
652 PType = getMessageSendResultType(QualType(OPT, 0), Getter, false, Super);
654 ParmVarDecl *ArgDecl = *Setter->param_begin();
655 PType = ArgDecl->getType();
658 ExprValueKind VK = VK_LValue;
659 ExprObjectKind OK = OK_ObjCProperty;
660 if (!getLangOptions().CPlusPlus && !PType.hasQualifiers() &&
662 VK = VK_RValue, OK = OK_Ordinary;
665 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter,
668 SuperLoc, SuperType));
670 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter,
672 MemberLoc, BaseExpr));
676 // Attempt to correct for typos in property names.
677 TypoCorrection Corrected = CorrectTypo(
678 DeclarationNameInfo(MemberName, MemberLoc), LookupOrdinaryName, NULL,
679 NULL, IFace, false, CTC_NoKeywords, OPT);
680 if (ObjCPropertyDecl *Property =
681 Corrected.getCorrectionDeclAs<ObjCPropertyDecl>()) {
682 DeclarationName TypoResult = Corrected.getCorrection();
683 Diag(MemberLoc, diag::err_property_not_found_suggest)
684 << MemberName << QualType(OPT, 0) << TypoResult
685 << FixItHint::CreateReplacement(MemberLoc, TypoResult.getAsString());
686 Diag(Property->getLocation(), diag::note_previous_decl)
687 << Property->getDeclName();
688 return HandleExprPropertyRefExpr(OPT, BaseExpr, OpLoc,
689 TypoResult, MemberLoc,
690 SuperLoc, SuperType, Super);
692 ObjCInterfaceDecl *ClassDeclared;
693 if (ObjCIvarDecl *Ivar =
694 IFace->lookupInstanceVariable(Member, ClassDeclared)) {
695 QualType T = Ivar->getType();
696 if (const ObjCObjectPointerType * OBJPT =
697 T->getAsObjCInterfacePointerType()) {
698 const ObjCInterfaceType *IFaceT = OBJPT->getInterfaceType();
699 if (ObjCInterfaceDecl *IFace = IFaceT->getDecl())
700 if (IFace->isForwardDecl()) {
701 Diag(MemberLoc, diag::err_property_not_as_forward_class)
702 << MemberName << IFace;
703 Diag(IFace->getLocation(), diag::note_forward_class);
708 diag::err_ivar_access_using_property_syntax_suggest)
709 << MemberName << QualType(OPT, 0) << Ivar->getDeclName()
710 << FixItHint::CreateReplacement(OpLoc, "->");
714 Diag(MemberLoc, diag::err_property_not_found)
715 << MemberName << QualType(OPT, 0);
717 Diag(Setter->getLocation(), diag::note_getter_unavailable)
718 << MemberName << BaseExpr->getSourceRange();
725 ActOnClassPropertyRefExpr(IdentifierInfo &receiverName,
726 IdentifierInfo &propertyName,
727 SourceLocation receiverNameLoc,
728 SourceLocation propertyNameLoc) {
730 IdentifierInfo *receiverNamePtr = &receiverName;
731 ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr,
734 bool IsSuper = false;
736 // If the "receiver" is 'super' in a method, handle it as an expression-like
737 // property reference.
738 if (receiverNamePtr->isStr("super")) {
741 if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf()) {
742 if (CurMethod->isInstanceMethod()) {
744 Context.getObjCInterfaceType(CurMethod->getClassInterface());
745 T = Context.getObjCObjectPointerType(T);
747 return HandleExprPropertyRefExpr(T->getAsObjCInterfacePointerType(),
749 SourceLocation()/*OpLoc*/,
752 receiverNameLoc, T, true);
755 // Otherwise, if this is a class method, try dispatching to our
757 IFace = CurMethod->getClassInterface()->getSuperClass();
762 Diag(receiverNameLoc, diag::err_expected_ident_or_lparen);
767 // Search for a declared property first.
768 Selector Sel = PP.getSelectorTable().getNullarySelector(&propertyName);
769 ObjCMethodDecl *Getter = IFace->lookupClassMethod(Sel);
771 // If this reference is in an @implementation, check for 'private' methods.
773 if (ObjCMethodDecl *CurMeth = getCurMethodDecl())
774 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface())
775 if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation())
776 Getter = ImpDecl->getClassMethod(Sel);
779 // FIXME: refactor/share with ActOnMemberReference().
780 // Check if we can reference this property.
781 if (DiagnoseUseOfDecl(Getter, propertyNameLoc))
785 // Look for the matching setter, in case it is needed.
787 SelectorTable::constructSetterName(PP.getIdentifierTable(),
788 PP.getSelectorTable(), &propertyName);
790 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
792 // If this reference is in an @implementation, also check for 'private'
794 if (ObjCMethodDecl *CurMeth = getCurMethodDecl())
795 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface())
796 if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation())
797 Setter = ImpDecl->getClassMethod(SetterSel);
799 // Look through local category implementations associated with the class.
801 Setter = IFace->getCategoryClassMethod(SetterSel);
803 if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc))
806 if (Getter || Setter) {
809 ExprValueKind VK = VK_LValue;
811 PType = getMessageSendResultType(Context.getObjCInterfaceType(IFace),
813 receiverNamePtr->isStr("super"));
814 if (!getLangOptions().CPlusPlus &&
815 !PType.hasQualifiers() && PType->isVoidType())
818 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(),
819 E = Setter->param_end(); PI != E; ++PI)
820 PType = (*PI)->getType();
824 ExprObjectKind OK = (VK == VK_RValue ? OK_Ordinary : OK_ObjCProperty);
827 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter,
831 Context.getObjCInterfaceType(IFace)));
833 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter,
836 receiverNameLoc, IFace));
838 return ExprError(Diag(propertyNameLoc, diag::err_property_not_found)
839 << &propertyName << Context.getObjCInterfaceType(IFace));
842 Sema::ObjCMessageKind Sema::getObjCMessageKind(Scope *S,
843 IdentifierInfo *Name,
844 SourceLocation NameLoc,
847 ParsedType &ReceiverType) {
848 ReceiverType = ParsedType();
850 // If the identifier is "super" and there is no trailing dot, we're
851 // messaging super. If the identifier is "super" and there is a
852 // trailing dot, it's an instance message.
853 if (IsSuper && S->isInObjcMethodScope())
854 return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage;
856 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
857 LookupName(Result, S);
859 switch (Result.getResultKind()) {
860 case LookupResult::NotFound:
861 // Normal name lookup didn't find anything. If we're in an
862 // Objective-C method, look for ivars. If we find one, we're done!
863 // FIXME: This is a hack. Ivar lookup should be part of normal
865 if (ObjCMethodDecl *Method = getCurMethodDecl()) {
866 ObjCInterfaceDecl *ClassDeclared;
867 if (Method->getClassInterface()->lookupInstanceVariable(Name,
869 return ObjCInstanceMessage;
872 // Break out; we'll perform typo correction below.
875 case LookupResult::NotFoundInCurrentInstantiation:
876 case LookupResult::FoundOverloaded:
877 case LookupResult::FoundUnresolvedValue:
878 case LookupResult::Ambiguous:
879 Result.suppressDiagnostics();
880 return ObjCInstanceMessage;
882 case LookupResult::Found: {
883 // If the identifier is a class or not, and there is a trailing dot,
884 // it's an instance message.
886 return ObjCInstanceMessage;
887 // We found something. If it's a type, then we have a class
888 // message. Otherwise, it's an instance message.
889 NamedDecl *ND = Result.getFoundDecl();
891 if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND))
892 T = Context.getObjCInterfaceType(Class);
893 else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND))
894 T = Context.getTypeDeclType(Type);
896 return ObjCInstanceMessage;
898 // We have a class message, and T is the type we're
899 // messaging. Build source-location information for it.
900 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
901 ReceiverType = CreateParsedType(T, TSInfo);
902 return ObjCClassMessage;
906 // Determine our typo-correction context.
907 CorrectTypoContext CTC = CTC_Expression;
908 if (ObjCMethodDecl *Method = getCurMethodDecl())
909 if (Method->getClassInterface() &&
910 Method->getClassInterface()->getSuperClass())
911 CTC = CTC_ObjCMessageReceiver;
913 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(),
914 Result.getLookupKind(), S, NULL,
916 if (NamedDecl *ND = Corrected.getCorrectionDecl()) {
917 // If we found a declaration, correct when it refers to an Objective-C
919 if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND)) {
920 Diag(NameLoc, diag::err_unknown_receiver_suggest)
921 << Name << Corrected.getCorrection()
922 << FixItHint::CreateReplacement(SourceRange(NameLoc),
923 ND->getNameAsString());
924 Diag(ND->getLocation(), diag::note_previous_decl)
925 << Corrected.getCorrection();
927 QualType T = Context.getObjCInterfaceType(Class);
928 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
929 ReceiverType = CreateParsedType(T, TSInfo);
930 return ObjCClassMessage;
932 } else if (Corrected.isKeyword() &&
933 Corrected.getCorrectionAsIdentifierInfo()->isStr("super")) {
934 // If we've found the keyword "super", this is a send to super.
935 Diag(NameLoc, diag::err_unknown_receiver_suggest)
936 << Name << Corrected.getCorrection()
937 << FixItHint::CreateReplacement(SourceRange(NameLoc), "super");
938 return ObjCSuperMessage;
942 // Fall back: let the parser try to parse it as an instance message.
943 return ObjCInstanceMessage;
946 ExprResult Sema::ActOnSuperMessage(Scope *S,
947 SourceLocation SuperLoc,
949 SourceLocation LBracLoc,
950 SourceLocation SelectorLoc,
951 SourceLocation RBracLoc,
953 // Determine whether we are inside a method or not.
954 ObjCMethodDecl *Method = tryCaptureObjCSelf();
956 Diag(SuperLoc, diag::err_invalid_receiver_to_message_super);
960 ObjCInterfaceDecl *Class = Method->getClassInterface();
962 Diag(SuperLoc, diag::error_no_super_class_message)
963 << Method->getDeclName();
967 ObjCInterfaceDecl *Super = Class->getSuperClass();
969 // The current class does not have a superclass.
970 Diag(SuperLoc, diag::error_root_class_cannot_use_super)
971 << Class->getIdentifier();
975 // We are in a method whose class has a superclass, so 'super'
976 // is acting as a keyword.
977 if (Method->isInstanceMethod()) {
978 // Since we are in an instance method, this is an instance
979 // message to the superclass instance.
980 QualType SuperTy = Context.getObjCInterfaceType(Super);
981 SuperTy = Context.getObjCObjectPointerType(SuperTy);
982 return BuildInstanceMessage(0, SuperTy, SuperLoc,
984 LBracLoc, SelectorLoc, RBracLoc, move(Args));
987 // Since we are in a class method, this is a class message to
989 return BuildClassMessage(/*ReceiverTypeInfo=*/0,
990 Context.getObjCInterfaceType(Super),
991 SuperLoc, Sel, /*Method=*/0,
992 LBracLoc, SelectorLoc, RBracLoc, move(Args));
995 /// \brief Build an Objective-C class message expression.
997 /// This routine takes care of both normal class messages and
998 /// class messages to the superclass.
1000 /// \param ReceiverTypeInfo Type source information that describes the
1001 /// receiver of this message. This may be NULL, in which case we are
1002 /// sending to the superclass and \p SuperLoc must be a valid source
1005 /// \param ReceiverType The type of the object receiving the
1006 /// message. When \p ReceiverTypeInfo is non-NULL, this is the same
1007 /// type as that refers to. For a superclass send, this is the type of
1010 /// \param SuperLoc The location of the "super" keyword in a
1011 /// superclass message.
1013 /// \param Sel The selector to which the message is being sent.
1015 /// \param Method The method that this class message is invoking, if
1018 /// \param LBracLoc The location of the opening square bracket ']'.
1020 /// \param RBrac The location of the closing square bracket ']'.
1022 /// \param Args The message arguments.
1023 ExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo,
1024 QualType ReceiverType,
1025 SourceLocation SuperLoc,
1027 ObjCMethodDecl *Method,
1028 SourceLocation LBracLoc,
1029 SourceLocation SelectorLoc,
1030 SourceLocation RBracLoc,
1031 MultiExprArg ArgsIn) {
1032 SourceLocation Loc = SuperLoc.isValid()? SuperLoc
1033 : ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin();
1034 if (LBracLoc.isInvalid()) {
1035 Diag(Loc, diag::err_missing_open_square_message_send)
1036 << FixItHint::CreateInsertion(Loc, "[");
1040 if (ReceiverType->isDependentType()) {
1041 // If the receiver type is dependent, we can't type-check anything
1042 // at this point. Build a dependent expression.
1043 unsigned NumArgs = ArgsIn.size();
1044 Expr **Args = reinterpret_cast<Expr **>(ArgsIn.release());
1045 assert(SuperLoc.isInvalid() && "Message to super with dependent type");
1046 return Owned(ObjCMessageExpr::Create(Context, ReceiverType,
1047 VK_RValue, LBracLoc, ReceiverTypeInfo,
1048 Sel, SelectorLoc, /*Method=*/0,
1049 Args, NumArgs, RBracLoc));
1052 // Find the class to which we are sending this message.
1053 ObjCInterfaceDecl *Class = 0;
1054 const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>();
1055 if (!ClassType || !(Class = ClassType->getInterface())) {
1056 Diag(Loc, diag::err_invalid_receiver_class_message)
1060 assert(Class && "We don't know which class we're messaging?");
1061 (void)DiagnoseUseOfDecl(Class, Loc);
1062 // Find the method we are messaging.
1064 if (Class->isForwardDecl()) {
1065 if (getLangOptions().ObjCAutoRefCount) {
1066 Diag(Loc, diag::err_arc_receiver_forward_class) << ReceiverType;
1068 Diag(Loc, diag::warn_receiver_forward_class) << Class->getDeclName();
1071 // A forward class used in messaging is treated as a 'Class'
1072 Method = LookupFactoryMethodInGlobalPool(Sel,
1073 SourceRange(LBracLoc, RBracLoc));
1074 if (Method && !getLangOptions().ObjCAutoRefCount)
1075 Diag(Method->getLocation(), diag::note_method_sent_forward_class)
1076 << Method->getDeclName();
1079 Method = Class->lookupClassMethod(Sel);
1081 // If we have an implementation in scope, check "private" methods.
1083 Method = LookupPrivateClassMethod(Sel, Class);
1085 if (Method && DiagnoseUseOfDecl(Method, Loc))
1089 // Check the argument types and determine the result type.
1090 QualType ReturnType;
1091 ExprValueKind VK = VK_RValue;
1093 unsigned NumArgs = ArgsIn.size();
1094 Expr **Args = reinterpret_cast<Expr **>(ArgsIn.release());
1095 if (CheckMessageArgumentTypes(ReceiverType, Args, NumArgs, Sel, Method, true,
1096 SuperLoc.isValid(), LBracLoc, RBracLoc,
1100 if (Method && !Method->getResultType()->isVoidType() &&
1101 RequireCompleteType(LBracLoc, Method->getResultType(),
1102 diag::err_illegal_message_expr_incomplete_type))
1105 // Construct the appropriate ObjCMessageExpr.
1107 if (SuperLoc.isValid())
1108 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
1109 SuperLoc, /*IsInstanceSuper=*/false,
1110 ReceiverType, Sel, SelectorLoc,
1111 Method, Args, NumArgs, RBracLoc);
1113 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
1114 ReceiverTypeInfo, Sel, SelectorLoc,
1115 Method, Args, NumArgs, RBracLoc);
1116 return MaybeBindToTemporary(Result);
1119 // ActOnClassMessage - used for both unary and keyword messages.
1120 // ArgExprs is optional - if it is present, the number of expressions
1121 // is obtained from Sel.getNumArgs().
1122 ExprResult Sema::ActOnClassMessage(Scope *S,
1123 ParsedType Receiver,
1125 SourceLocation LBracLoc,
1126 SourceLocation SelectorLoc,
1127 SourceLocation RBracLoc,
1128 MultiExprArg Args) {
1129 TypeSourceInfo *ReceiverTypeInfo;
1130 QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo);
1131 if (ReceiverType.isNull())
1135 if (!ReceiverTypeInfo)
1136 ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc);
1138 return BuildClassMessage(ReceiverTypeInfo, ReceiverType,
1139 /*SuperLoc=*/SourceLocation(), Sel, /*Method=*/0,
1140 LBracLoc, SelectorLoc, RBracLoc, move(Args));
1143 /// \brief Build an Objective-C instance message expression.
1145 /// This routine takes care of both normal instance messages and
1146 /// instance messages to the superclass instance.
1148 /// \param Receiver The expression that computes the object that will
1149 /// receive this message. This may be empty, in which case we are
1150 /// sending to the superclass instance and \p SuperLoc must be a valid
1151 /// source location.
1153 /// \param ReceiverType The (static) type of the object receiving the
1154 /// message. When a \p Receiver expression is provided, this is the
1155 /// same type as that expression. For a superclass instance send, this
1156 /// is a pointer to the type of the superclass.
1158 /// \param SuperLoc The location of the "super" keyword in a
1159 /// superclass instance message.
1161 /// \param Sel The selector to which the message is being sent.
1163 /// \param Method The method that this instance message is invoking, if
1166 /// \param LBracLoc The location of the opening square bracket ']'.
1168 /// \param RBrac The location of the closing square bracket ']'.
1170 /// \param Args The message arguments.
1171 ExprResult Sema::BuildInstanceMessage(Expr *Receiver,
1172 QualType ReceiverType,
1173 SourceLocation SuperLoc,
1175 ObjCMethodDecl *Method,
1176 SourceLocation LBracLoc,
1177 SourceLocation SelectorLoc,
1178 SourceLocation RBracLoc,
1179 MultiExprArg ArgsIn) {
1180 // The location of the receiver.
1181 SourceLocation Loc = SuperLoc.isValid()? SuperLoc : Receiver->getLocStart();
1183 if (LBracLoc.isInvalid()) {
1184 Diag(Loc, diag::err_missing_open_square_message_send)
1185 << FixItHint::CreateInsertion(Loc, "[");
1189 // If we have a receiver expression, perform appropriate promotions
1190 // and determine receiver type.
1192 if (Receiver->isTypeDependent()) {
1193 // If the receiver is type-dependent, we can't type-check anything
1194 // at this point. Build a dependent expression.
1195 unsigned NumArgs = ArgsIn.size();
1196 Expr **Args = reinterpret_cast<Expr **>(ArgsIn.release());
1197 assert(SuperLoc.isInvalid() && "Message to super with dependent type");
1198 return Owned(ObjCMessageExpr::Create(Context, Context.DependentTy,
1199 VK_RValue, LBracLoc, Receiver, Sel,
1200 SelectorLoc, /*Method=*/0,
1201 Args, NumArgs, RBracLoc));
1204 // If necessary, apply function/array conversion to the receiver.
1205 // C99 6.7.5.3p[7,8].
1206 ExprResult Result = DefaultFunctionArrayLvalueConversion(Receiver);
1207 if (Result.isInvalid())
1209 Receiver = Result.take();
1210 ReceiverType = Receiver->getType();
1214 // Handle messages to id.
1215 bool receiverIsId = ReceiverType->isObjCIdType();
1216 if (receiverIsId || ReceiverType->isBlockPointerType() ||
1217 (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) {
1218 Method = LookupInstanceMethodInGlobalPool(Sel,
1219 SourceRange(LBracLoc, RBracLoc),
1222 Method = LookupFactoryMethodInGlobalPool(Sel,
1223 SourceRange(LBracLoc, RBracLoc),
1225 } else if (ReceiverType->isObjCClassType() ||
1226 ReceiverType->isObjCQualifiedClassType()) {
1227 // Handle messages to Class.
1228 // We allow sending a message to a qualified Class ("Class<foo>"), which
1229 // is ok as long as one of the protocols implements the selector (if not, warn).
1230 if (const ObjCObjectPointerType *QClassTy
1231 = ReceiverType->getAsObjCQualifiedClassType()) {
1232 // Search protocols for class methods.
1233 Method = LookupMethodInQualifiedType(Sel, QClassTy, false);
1235 Method = LookupMethodInQualifiedType(Sel, QClassTy, true);
1236 // warn if instance method found for a Class message.
1238 Diag(Loc, diag::warn_instance_method_on_class_found)
1239 << Method->getSelector() << Sel;
1240 Diag(Method->getLocation(), diag::note_method_declared_at);
1244 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
1245 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) {
1246 // First check the public methods in the class interface.
1247 Method = ClassDecl->lookupClassMethod(Sel);
1250 Method = LookupPrivateClassMethod(Sel, ClassDecl);
1252 if (Method && DiagnoseUseOfDecl(Method, Loc))
1256 // If not messaging 'self', look for any factory method named 'Sel'.
1257 if (!Receiver || !isSelfExpr(Receiver)) {
1258 Method = LookupFactoryMethodInGlobalPool(Sel,
1259 SourceRange(LBracLoc, RBracLoc),
1262 // If no class (factory) method was found, check if an _instance_
1263 // method of the same name exists in the root class only.
1264 Method = LookupInstanceMethodInGlobalPool(Sel,
1265 SourceRange(LBracLoc, RBracLoc),
1268 if (const ObjCInterfaceDecl *ID =
1269 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) {
1270 if (ID->getSuperClass())
1271 Diag(Loc, diag::warn_root_inst_method_not_found)
1272 << Sel << SourceRange(LBracLoc, RBracLoc);
1279 ObjCInterfaceDecl* ClassDecl = 0;
1281 // We allow sending a message to a qualified ID ("id<foo>"), which is ok as
1282 // long as one of the protocols implements the selector (if not, warn).
1283 if (const ObjCObjectPointerType *QIdTy
1284 = ReceiverType->getAsObjCQualifiedIdType()) {
1285 // Search protocols for instance methods.
1286 Method = LookupMethodInQualifiedType(Sel, QIdTy, true);
1288 Method = LookupMethodInQualifiedType(Sel, QIdTy, false);
1289 } else if (const ObjCObjectPointerType *OCIType
1290 = ReceiverType->getAsObjCInterfacePointerType()) {
1291 // We allow sending a message to a pointer to an interface (an object).
1292 ClassDecl = OCIType->getInterfaceDecl();
1294 if (ClassDecl->isForwardDecl() && getLangOptions().ObjCAutoRefCount) {
1295 Diag(Loc, diag::err_arc_receiver_forward_instance)
1296 << OCIType->getPointeeType()
1297 << (Receiver ? Receiver->getSourceRange() : SourceRange(SuperLoc));
1301 // FIXME: consider using LookupInstanceMethodInGlobalPool, since it will be
1302 // faster than the following method (which can do *many* linear searches).
1303 // The idea is to add class info to MethodPool.
1304 Method = ClassDecl->lookupInstanceMethod(Sel);
1307 // Search protocol qualifiers.
1308 Method = LookupMethodInQualifiedType(Sel, OCIType, true);
1310 const ObjCInterfaceDecl *forwardClass = 0;
1312 // If we have implementations in scope, check "private" methods.
1313 Method = LookupPrivateInstanceMethod(Sel, ClassDecl);
1315 if (!Method && getLangOptions().ObjCAutoRefCount) {
1316 Diag(Loc, diag::err_arc_may_not_respond)
1317 << OCIType->getPointeeType() << Sel;
1321 if (!Method && (!Receiver || !isSelfExpr(Receiver))) {
1322 // If we still haven't found a method, look in the global pool. This
1323 // behavior isn't very desirable, however we need it for GCC
1324 // compatibility. FIXME: should we deviate??
1325 if (OCIType->qual_empty()) {
1326 Method = LookupInstanceMethodInGlobalPool(Sel,
1327 SourceRange(LBracLoc, RBracLoc));
1328 if (OCIType->getInterfaceDecl()->isForwardDecl())
1329 forwardClass = OCIType->getInterfaceDecl();
1330 if (Method && !forwardClass)
1331 Diag(Loc, diag::warn_maynot_respond)
1332 << OCIType->getInterfaceDecl()->getIdentifier() << Sel;
1336 if (Method && DiagnoseUseOfDecl(Method, Loc, forwardClass))
1338 } else if (!getLangOptions().ObjCAutoRefCount &&
1339 !Context.getObjCIdType().isNull() &&
1340 (ReceiverType->isPointerType() ||
1341 ReceiverType->isIntegerType())) {
1342 // Implicitly convert integers and pointers to 'id' but emit a warning.
1344 Diag(Loc, diag::warn_bad_receiver_type)
1346 << Receiver->getSourceRange();
1347 if (ReceiverType->isPointerType())
1348 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
1351 // TODO: specialized warning on null receivers?
1352 bool IsNull = Receiver->isNullPointerConstant(Context,
1353 Expr::NPC_ValueDependentIsNull);
1354 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
1355 IsNull ? CK_NullToPointer : CK_IntegralToPointer).take();
1357 ReceiverType = Receiver->getType();
1360 ExprResult ReceiverRes;
1361 if (getLangOptions().CPlusPlus)
1362 ReceiverRes = PerformContextuallyConvertToObjCId(Receiver);
1363 if (ReceiverRes.isUsable()) {
1364 Receiver = ReceiverRes.take();
1365 if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Receiver)) {
1366 Receiver = ICE->getSubExpr();
1367 ReceiverType = Receiver->getType();
1369 return BuildInstanceMessage(Receiver,
1379 // Reject other random receiver types (e.g. structs).
1380 Diag(Loc, diag::err_bad_receiver_type)
1381 << ReceiverType << Receiver->getSourceRange();
1388 // Check the message arguments.
1389 unsigned NumArgs = ArgsIn.size();
1390 Expr **Args = reinterpret_cast<Expr **>(ArgsIn.release());
1391 QualType ReturnType;
1392 ExprValueKind VK = VK_RValue;
1393 bool ClassMessage = (ReceiverType->isObjCClassType() ||
1394 ReceiverType->isObjCQualifiedClassType());
1395 if (CheckMessageArgumentTypes(ReceiverType, Args, NumArgs, Sel, Method,
1396 ClassMessage, SuperLoc.isValid(),
1397 LBracLoc, RBracLoc, ReturnType, VK))
1400 if (Method && !Method->getResultType()->isVoidType() &&
1401 RequireCompleteType(LBracLoc, Method->getResultType(),
1402 diag::err_illegal_message_expr_incomplete_type))
1405 // In ARC, forbid the user from sending messages to
1406 // retain/release/autorelease/dealloc/retainCount explicitly.
1407 if (getLangOptions().ObjCAutoRefCount) {
1408 ObjCMethodFamily family =
1409 (Method ? Method->getMethodFamily() : Sel.getMethodFamily());
1413 checkInitMethod(Method, ReceiverType);
1418 case OMF_mutableCopy:
1426 case OMF_autorelease:
1427 case OMF_retainCount:
1428 Diag(Loc, diag::err_arc_illegal_explicit_message)
1429 << Sel << SelectorLoc;
1432 case OMF_performSelector:
1433 if (Method && NumArgs >= 1) {
1434 if (ObjCSelectorExpr *SelExp = dyn_cast<ObjCSelectorExpr>(Args[0])) {
1435 Selector ArgSel = SelExp->getSelector();
1436 ObjCMethodDecl *SelMethod =
1437 LookupInstanceMethodInGlobalPool(ArgSel,
1438 SelExp->getSourceRange());
1441 LookupFactoryMethodInGlobalPool(ArgSel,
1442 SelExp->getSourceRange());
1444 ObjCMethodFamily SelFamily = SelMethod->getMethodFamily();
1445 switch (SelFamily) {
1448 case OMF_mutableCopy:
1452 // Issue error, unless ns_returns_not_retained.
1453 if (!SelMethod->hasAttr<NSReturnsNotRetainedAttr>()) {
1454 // selector names a +1 method
1456 diag::err_arc_perform_selector_retains);
1457 Diag(SelMethod->getLocation(), diag::note_method_declared_at);
1461 // +0 call. OK. unless ns_returns_retained.
1462 if (SelMethod->hasAttr<NSReturnsRetainedAttr>()) {
1463 // selector names a +1 method
1465 diag::err_arc_perform_selector_retains);
1466 Diag(SelMethod->getLocation(), diag::note_method_declared_at);
1472 // error (may leak).
1473 Diag(SelectorLoc, diag::warn_arc_perform_selector_leaks);
1474 Diag(Args[0]->getExprLoc(), diag::note_used_here);
1481 // Construct the appropriate ObjCMessageExpr instance.
1482 ObjCMessageExpr *Result;
1483 if (SuperLoc.isValid())
1484 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
1485 SuperLoc, /*IsInstanceSuper=*/true,
1486 ReceiverType, Sel, SelectorLoc, Method,
1487 Args, NumArgs, RBracLoc);
1489 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
1490 Receiver, Sel, SelectorLoc, Method,
1491 Args, NumArgs, RBracLoc);
1493 if (getLangOptions().ObjCAutoRefCount) {
1494 // In ARC, annotate delegate init calls.
1495 if (Result->getMethodFamily() == OMF_init &&
1496 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
1497 // Only consider init calls *directly* in init implementations,
1498 // not within blocks.
1499 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(CurContext);
1500 if (method && method->getMethodFamily() == OMF_init) {
1501 // The implicit assignment to self means we also don't want to
1502 // consume the result.
1503 Result->setDelegateInitCall(true);
1504 return Owned(Result);
1508 // In ARC, check for message sends which are likely to introduce
1510 checkRetainCycles(Result);
1513 return MaybeBindToTemporary(Result);
1516 // ActOnInstanceMessage - used for both unary and keyword messages.
1517 // ArgExprs is optional - if it is present, the number of expressions
1518 // is obtained from Sel.getNumArgs().
1519 ExprResult Sema::ActOnInstanceMessage(Scope *S,
1522 SourceLocation LBracLoc,
1523 SourceLocation SelectorLoc,
1524 SourceLocation RBracLoc,
1525 MultiExprArg Args) {
1529 return BuildInstanceMessage(Receiver, Receiver->getType(),
1530 /*SuperLoc=*/SourceLocation(), Sel, /*Method=*/0,
1531 LBracLoc, SelectorLoc, RBracLoc, move(Args));
1534 enum ARCConversionTypeClass {
1537 ACTC_indirectRetainable
1539 static ARCConversionTypeClass classifyTypeForARCConversion(QualType type) {
1540 ARCConversionTypeClass ACTC = ACTC_retainable;
1542 // Ignore an outermost reference type.
1543 if (const ReferenceType *ref = type->getAs<ReferenceType>())
1544 type = ref->getPointeeType();
1546 // Drill through pointers and arrays recursively.
1548 if (const PointerType *ptr = type->getAs<PointerType>()) {
1549 type = ptr->getPointeeType();
1550 } else if (const ArrayType *array = type->getAsArrayTypeUnsafe()) {
1551 type = QualType(array->getElementType()->getBaseElementTypeUnsafe(), 0);
1555 ACTC = ACTC_indirectRetainable;
1558 if (!type->isObjCRetainableType()) return ACTC_none;
1563 /// Return true if the given expression can be reasonably converted
1564 /// between a retainable pointer type and a C pointer type.
1565 struct ARCCastChecker : StmtVisitor<ARCCastChecker, bool> {
1566 ASTContext &Context;
1567 ARCCastChecker(ASTContext &Context) : Context(Context) {}
1568 bool VisitStmt(Stmt *s) {
1571 bool VisitExpr(Expr *e) {
1572 return e->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull);
1575 bool VisitParenExpr(ParenExpr *e) {
1576 return Visit(e->getSubExpr());
1578 bool VisitCastExpr(CastExpr *e) {
1579 switch (e->getCastKind()) {
1580 case CK_NullToPointer:
1583 case CK_LValueToRValue:
1585 case CK_AnyPointerToObjCPointerCast:
1586 case CK_AnyPointerToBlockPointerCast:
1587 return Visit(e->getSubExpr());
1592 bool VisitUnaryExtension(UnaryOperator *e) {
1593 return Visit(e->getSubExpr());
1595 bool VisitBinComma(BinaryOperator *e) {
1596 return Visit(e->getRHS());
1598 bool VisitConditionalOperator(ConditionalOperator *e) {
1599 // Conditional operators are okay if both sides are okay.
1600 return Visit(e->getTrueExpr()) && Visit(e->getFalseExpr());
1602 bool VisitObjCStringLiteral(ObjCStringLiteral *e) {
1603 // Always white-list Objective-C string literals.
1606 bool VisitStmtExpr(StmtExpr *e) {
1607 return Visit(e->getSubStmt()->body_back());
1609 bool VisitDeclRefExpr(DeclRefExpr *e) {
1610 // White-list references to global extern strings from system
1612 if (VarDecl *var = dyn_cast<VarDecl>(e->getDecl()))
1613 if (var->getStorageClass() == SC_Extern &&
1614 var->getType().isConstQualified() &&
1615 Context.getSourceManager().isInSystemHeader(var->getLocation()))
1623 Sema::ValidObjCARCNoBridgeCastExpr(Expr *&Exp, QualType castType) {
1624 Expr *NewExp = Exp->IgnoreParenCasts();
1626 if (!isa<ObjCMessageExpr>(NewExp) && !isa<ObjCPropertyRefExpr>(NewExp)
1627 && !isa<CallExpr>(NewExp))
1629 ObjCMethodDecl *method = 0;
1630 bool MethodReturnsPlusOne = false;
1632 if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(NewExp)) {
1633 method = PRE->getExplicitProperty()->getGetterMethodDecl();
1635 else if (ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(NewExp))
1636 method = ME->getMethodDecl();
1638 CallExpr *CE = cast<CallExpr>(NewExp);
1639 Decl *CallDecl = CE->getCalleeDecl();
1642 if (CallDecl->hasAttr<CFReturnsNotRetainedAttr>())
1644 MethodReturnsPlusOne = CallDecl->hasAttr<CFReturnsRetainedAttr>();
1645 if (!MethodReturnsPlusOne) {
1646 if (NamedDecl *ND = dyn_cast<NamedDecl>(CallDecl))
1647 if (const IdentifierInfo *Id = ND->getIdentifier())
1648 if (Id->isStr("__builtin___CFStringMakeConstantString"))
1653 if (!MethodReturnsPlusOne) {
1656 if (method->hasAttr<CFReturnsNotRetainedAttr>())
1658 MethodReturnsPlusOne = method->hasAttr<CFReturnsRetainedAttr>();
1659 if (!MethodReturnsPlusOne) {
1660 ObjCMethodFamily family = method->getSelector().getMethodFamily();
1664 case OMF_mutableCopy:
1666 MethodReturnsPlusOne = true;
1674 if (MethodReturnsPlusOne) {
1675 TypeSourceInfo *TSInfo =
1676 Context.getTrivialTypeSourceInfo(castType, SourceLocation());
1677 ExprResult ExpRes = BuildObjCBridgedCast(SourceLocation(), OBC_BridgeTransfer,
1678 SourceLocation(), TSInfo, Exp);
1679 Exp = ExpRes.take();
1685 Sema::CheckObjCARCConversion(SourceRange castRange, QualType castType,
1686 Expr *&castExpr, CheckedConversionKind CCK) {
1687 QualType castExprType = castExpr->getType();
1689 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExprType);
1690 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
1691 if (exprACTC == castACTC) return;
1692 if (exprACTC && castType->isIntegralType(Context)) return;
1694 // Allow casts between pointers to lifetime types (e.g., __strong id*)
1695 // and pointers to void (e.g., cv void *). Casting from void* to lifetime*
1696 // must be explicit.
1697 if (const PointerType *CastPtr = castType->getAs<PointerType>()) {
1698 if (const PointerType *CastExprPtr = castExprType->getAs<PointerType>()) {
1699 QualType CastPointee = CastPtr->getPointeeType();
1700 QualType CastExprPointee = CastExprPtr->getPointeeType();
1701 if ((CCK != CCK_ImplicitConversion &&
1702 CastPointee->isObjCIndirectLifetimeType() &&
1703 CastExprPointee->isVoidType()) ||
1704 (CastPointee->isVoidType() &&
1705 CastExprPointee->isObjCIndirectLifetimeType()))
1710 if (ARCCastChecker(Context).Visit(castExpr))
1713 SourceLocation loc =
1714 (castRange.isValid() ? castRange.getBegin() : castExpr->getExprLoc());
1716 if (makeUnavailableInSystemHeader(loc,
1717 "converts between Objective-C and C pointers in -fobjc-arc"))
1720 unsigned srcKind = 0;
1723 srcKind = (castExprType->isPointerType() ? 1 : 0);
1725 case ACTC_retainable:
1726 srcKind = (castExprType->isBlockPointerType() ? 2 : 3);
1728 case ACTC_indirectRetainable:
1733 if (CCK == CCK_CStyleCast) {
1734 // Check whether this could be fixed with a bridge cast.
1735 SourceLocation AfterLParen = PP.getLocForEndOfToken(castRange.getBegin());
1736 SourceLocation NoteLoc = AfterLParen.isValid()? AfterLParen : loc;
1738 if (castType->isObjCARCBridgableType() &&
1739 castExprType->isCARCBridgableType()) {
1740 // explicit unbridged casts are allowed if the source of the cast is a
1741 // message sent to an objc method (or property access)
1742 if (ValidObjCARCNoBridgeCastExpr(castExpr, castType))
1744 Diag(loc, diag::err_arc_cast_requires_bridge)
1747 << (castType->isBlockPointerType()? 1 : 0)
1750 << castExpr->getSourceRange();
1751 Diag(NoteLoc, diag::note_arc_bridge)
1752 << FixItHint::CreateInsertion(AfterLParen, "__bridge ");
1753 Diag(NoteLoc, diag::note_arc_bridge_transfer)
1755 << FixItHint::CreateInsertion(AfterLParen, "__bridge_transfer ");
1760 if (castType->isCARCBridgableType() &&
1761 castExprType->isObjCARCBridgableType()){
1762 Diag(loc, diag::err_arc_cast_requires_bridge)
1763 << (castExprType->isBlockPointerType()? 1 : 0)
1768 << castExpr->getSourceRange();
1770 Diag(NoteLoc, diag::note_arc_bridge)
1771 << FixItHint::CreateInsertion(AfterLParen, "__bridge ");
1772 Diag(NoteLoc, diag::note_arc_bridge_retained)
1774 << FixItHint::CreateInsertion(AfterLParen, "__bridge_retained ");
1779 Diag(loc, diag::err_arc_mismatched_cast)
1780 << (CCK != CCK_ImplicitConversion) << srcKind << castExprType << castType
1781 << castRange << castExpr->getSourceRange();
1784 bool Sema::CheckObjCARCUnavailableWeakConversion(QualType castType,
1785 QualType exprType) {
1786 QualType canCastType =
1787 Context.getCanonicalType(castType).getUnqualifiedType();
1788 QualType canExprType =
1789 Context.getCanonicalType(exprType).getUnqualifiedType();
1790 if (isa<ObjCObjectPointerType>(canCastType) &&
1791 castType.getObjCLifetime() == Qualifiers::OCL_Weak &&
1792 canExprType->isObjCObjectPointerType()) {
1793 if (const ObjCObjectPointerType *ObjT =
1794 canExprType->getAs<ObjCObjectPointerType>())
1795 if (ObjT->getInterfaceDecl()->isArcWeakrefUnavailable())
1801 /// Look for an ObjCReclaimReturnedObject cast and destroy it.
1802 static Expr *maybeUndoReclaimObject(Expr *e) {
1803 // For now, we just undo operands that are *immediately* reclaim
1804 // expressions, which prevents the vast majority of potential
1805 // problems here. To catch them all, we'd need to rebuild arbitrary
1806 // value-propagating subexpressions --- we can't reliably rebuild
1807 // in-place because of expression sharing.
1808 if (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e))
1809 if (ice->getCastKind() == CK_ObjCReclaimReturnedObject)
1810 return ice->getSubExpr();
1815 ExprResult Sema::BuildObjCBridgedCast(SourceLocation LParenLoc,
1816 ObjCBridgeCastKind Kind,
1817 SourceLocation BridgeKeywordLoc,
1818 TypeSourceInfo *TSInfo,
1820 QualType T = TSInfo->getType();
1821 QualType FromType = SubExpr->getType();
1823 bool MustConsume = false;
1824 if (T->isDependentType() || SubExpr->isTypeDependent()) {
1825 // Okay: we'll build a dependent expression type.
1826 } else if (T->isObjCARCBridgableType() && FromType->isCARCBridgableType()) {
1832 case OBC_BridgeRetained:
1833 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
1836 << (T->isBlockPointerType()? 1 : 0)
1838 << SubExpr->getSourceRange()
1840 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
1841 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge");
1842 Diag(BridgeKeywordLoc, diag::note_arc_bridge_transfer)
1844 << FixItHint::CreateReplacement(BridgeKeywordLoc,
1845 "__bridge_transfer ");
1850 case OBC_BridgeTransfer:
1851 // We must consume the Objective-C object produced by the cast.
1855 } else if (T->isCARCBridgableType() && FromType->isObjCARCBridgableType()) {
1859 // Reclaiming a value that's going to be __bridge-casted to CF
1860 // is very dangerous, so we don't do it.
1861 SubExpr = maybeUndoReclaimObject(SubExpr);
1864 case OBC_BridgeRetained:
1865 // Produce the object before casting it.
1866 SubExpr = ImplicitCastExpr::Create(Context, FromType,
1867 CK_ObjCProduceObject,
1868 SubExpr, 0, VK_RValue);
1871 case OBC_BridgeTransfer:
1872 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
1873 << (FromType->isBlockPointerType()? 1 : 0)
1877 << SubExpr->getSourceRange()
1880 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
1881 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge ");
1882 Diag(BridgeKeywordLoc, diag::note_arc_bridge_retained)
1884 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge_retained ");
1890 Diag(LParenLoc, diag::err_arc_bridge_cast_incompatible)
1891 << FromType << T << Kind
1892 << SubExpr->getSourceRange()
1893 << TSInfo->getTypeLoc().getSourceRange();
1897 Expr *Result = new (Context) ObjCBridgedCastExpr(LParenLoc, Kind,
1902 ExprNeedsCleanups = true;
1903 Result = ImplicitCastExpr::Create(Context, T, CK_ObjCConsumeObject, Result,
1910 ExprResult Sema::ActOnObjCBridgedCast(Scope *S,
1911 SourceLocation LParenLoc,
1912 ObjCBridgeCastKind Kind,
1913 SourceLocation BridgeKeywordLoc,
1915 SourceLocation RParenLoc,
1917 TypeSourceInfo *TSInfo = 0;
1918 QualType T = GetTypeFromParser(Type, &TSInfo);
1920 TSInfo = Context.getTrivialTypeSourceInfo(T, LParenLoc);
1921 return BuildObjCBridgedCast(LParenLoc, Kind, BridgeKeywordLoc, TSInfo,