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/AST/ASTContext.h"
16 #include "clang/AST/DeclObjC.h"
17 #include "clang/AST/ExprObjC.h"
18 #include "clang/AST/StmtVisitor.h"
19 #include "clang/AST/TypeLoc.h"
20 #include "clang/Analysis/DomainSpecific/CocoaConventions.h"
21 #include "clang/Edit/Commit.h"
22 #include "clang/Edit/Rewriters.h"
23 #include "clang/Lex/Preprocessor.h"
24 #include "clang/Sema/Initialization.h"
25 #include "clang/Sema/Lookup.h"
26 #include "clang/Sema/Scope.h"
27 #include "clang/Sema/ScopeInfo.h"
28 #include "llvm/ADT/SmallString.h"
30 using namespace clang;
32 using llvm::makeArrayRef;
34 ExprResult Sema::ParseObjCStringLiteral(SourceLocation *AtLocs,
35 ArrayRef<Expr *> Strings) {
36 // Most ObjC strings are formed out of a single piece. However, we *can*
37 // have strings formed out of multiple @ strings with multiple pptokens in
38 // each one, e.g. @"foo" "bar" @"baz" "qux" which need to be turned into one
39 // StringLiteral for ObjCStringLiteral to hold onto.
40 StringLiteral *S = cast<StringLiteral>(Strings[0]);
42 // If we have a multi-part string, merge it all together.
43 if (Strings.size() != 1) {
44 // Concatenate objc strings.
45 SmallString<128> StrBuf;
46 SmallVector<SourceLocation, 8> StrLocs;
48 for (Expr *E : Strings) {
49 S = cast<StringLiteral>(E);
51 // ObjC strings can't be wide or UTF.
53 Diag(S->getLocStart(), diag::err_cfstring_literal_not_string_constant)
54 << S->getSourceRange();
59 StrBuf += S->getString();
61 // Get the locations of the string tokens.
62 StrLocs.append(S->tokloc_begin(), S->tokloc_end());
65 // Create the aggregate string with the appropriate content and location
67 const ConstantArrayType *CAT = Context.getAsConstantArrayType(S->getType());
68 assert(CAT && "String literal not of constant array type!");
69 QualType StrTy = Context.getConstantArrayType(
70 CAT->getElementType(), llvm::APInt(32, StrBuf.size() + 1),
71 CAT->getSizeModifier(), CAT->getIndexTypeCVRQualifiers());
72 S = StringLiteral::Create(Context, StrBuf, StringLiteral::Ascii,
73 /*Pascal=*/false, StrTy, &StrLocs[0],
77 return BuildObjCStringLiteral(AtLocs[0], S);
80 ExprResult Sema::BuildObjCStringLiteral(SourceLocation AtLoc, StringLiteral *S){
81 // Verify that this composite string is acceptable for ObjC strings.
82 if (CheckObjCString(S))
85 // Initialize the constant string interface lazily. This assumes
86 // the NSString interface is seen in this translation unit. Note: We
87 // don't use NSConstantString, since the runtime team considers this
88 // interface private (even though it appears in the header files).
89 QualType Ty = Context.getObjCConstantStringInterface();
91 Ty = Context.getObjCObjectPointerType(Ty);
92 } else if (getLangOpts().NoConstantCFStrings) {
93 IdentifierInfo *NSIdent=nullptr;
94 std::string StringClass(getLangOpts().ObjCConstantStringClass);
96 if (StringClass.empty())
97 NSIdent = &Context.Idents.get("NSConstantString");
99 NSIdent = &Context.Idents.get(StringClass);
101 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
103 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
104 Context.setObjCConstantStringInterface(StrIF);
105 Ty = Context.getObjCConstantStringInterface();
106 Ty = Context.getObjCObjectPointerType(Ty);
108 // If there is no NSConstantString interface defined then treat this
109 // as error and recover from it.
110 Diag(S->getLocStart(), diag::err_no_nsconstant_string_class) << NSIdent
111 << S->getSourceRange();
112 Ty = Context.getObjCIdType();
115 IdentifierInfo *NSIdent = NSAPIObj->getNSClassId(NSAPI::ClassId_NSString);
116 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
118 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
119 Context.setObjCConstantStringInterface(StrIF);
120 Ty = Context.getObjCConstantStringInterface();
121 Ty = Context.getObjCObjectPointerType(Ty);
123 // If there is no NSString interface defined, implicitly declare
124 // a @class NSString; and use that instead. This is to make sure
125 // type of an NSString literal is represented correctly, instead of
126 // being an 'id' type.
127 Ty = Context.getObjCNSStringType();
129 ObjCInterfaceDecl *NSStringIDecl =
130 ObjCInterfaceDecl::Create (Context,
131 Context.getTranslationUnitDecl(),
132 SourceLocation(), NSIdent,
133 nullptr, nullptr, SourceLocation());
134 Ty = Context.getObjCInterfaceType(NSStringIDecl);
135 Context.setObjCNSStringType(Ty);
137 Ty = Context.getObjCObjectPointerType(Ty);
141 return new (Context) ObjCStringLiteral(S, Ty, AtLoc);
144 /// \brief Emits an error if the given method does not exist, or if the return
145 /// type is not an Objective-C object.
146 static bool validateBoxingMethod(Sema &S, SourceLocation Loc,
147 const ObjCInterfaceDecl *Class,
148 Selector Sel, const ObjCMethodDecl *Method) {
150 // FIXME: Is there a better way to avoid quotes than using getName()?
151 S.Diag(Loc, diag::err_undeclared_boxing_method) << Sel << Class->getName();
155 // Make sure the return type is reasonable.
156 QualType ReturnType = Method->getReturnType();
157 if (!ReturnType->isObjCObjectPointerType()) {
158 S.Diag(Loc, diag::err_objc_literal_method_sig)
160 S.Diag(Method->getLocation(), diag::note_objc_literal_method_return)
168 /// \brief Maps ObjCLiteralKind to NSClassIdKindKind
169 static NSAPI::NSClassIdKindKind ClassKindFromLiteralKind(
170 Sema::ObjCLiteralKind LiteralKind) {
171 switch (LiteralKind) {
173 return NSAPI::ClassId_NSArray;
174 case Sema::LK_Dictionary:
175 return NSAPI::ClassId_NSDictionary;
176 case Sema::LK_Numeric:
177 return NSAPI::ClassId_NSNumber;
178 case Sema::LK_String:
179 return NSAPI::ClassId_NSString;
181 return NSAPI::ClassId_NSValue;
183 // there is no corresponding matching
184 // between LK_None/LK_Block and NSClassIdKindKind
189 llvm_unreachable("LiteralKind can't be converted into a ClassKind");
192 /// \brief Validates ObjCInterfaceDecl availability.
193 /// ObjCInterfaceDecl, used to create ObjC literals, should be defined
194 /// if clang not in a debugger mode.
195 static bool ValidateObjCLiteralInterfaceDecl(Sema &S, ObjCInterfaceDecl *Decl,
197 Sema::ObjCLiteralKind LiteralKind) {
199 NSAPI::NSClassIdKindKind Kind = ClassKindFromLiteralKind(LiteralKind);
200 IdentifierInfo *II = S.NSAPIObj->getNSClassId(Kind);
201 S.Diag(Loc, diag::err_undeclared_objc_literal_class)
202 << II->getName() << LiteralKind;
204 } else if (!Decl->hasDefinition() && !S.getLangOpts().DebuggerObjCLiteral) {
205 S.Diag(Loc, diag::err_undeclared_objc_literal_class)
206 << Decl->getName() << LiteralKind;
207 S.Diag(Decl->getLocation(), diag::note_forward_class);
214 /// \brief Looks up ObjCInterfaceDecl of a given NSClassIdKindKind.
215 /// Used to create ObjC literals, such as NSDictionary (@{}),
216 /// NSArray (@[]) and Boxed Expressions (@())
217 static ObjCInterfaceDecl *LookupObjCInterfaceDeclForLiteral(Sema &S,
219 Sema::ObjCLiteralKind LiteralKind) {
220 NSAPI::NSClassIdKindKind ClassKind = ClassKindFromLiteralKind(LiteralKind);
221 IdentifierInfo *II = S.NSAPIObj->getNSClassId(ClassKind);
222 NamedDecl *IF = S.LookupSingleName(S.TUScope, II, Loc,
223 Sema::LookupOrdinaryName);
224 ObjCInterfaceDecl *ID = dyn_cast_or_null<ObjCInterfaceDecl>(IF);
225 if (!ID && S.getLangOpts().DebuggerObjCLiteral) {
226 ASTContext &Context = S.Context;
227 TranslationUnitDecl *TU = Context.getTranslationUnitDecl();
228 ID = ObjCInterfaceDecl::Create (Context, TU, SourceLocation(), II,
229 nullptr, nullptr, SourceLocation());
232 if (!ValidateObjCLiteralInterfaceDecl(S, ID, Loc, LiteralKind)) {
239 /// \brief Retrieve the NSNumber factory method that should be used to create
240 /// an Objective-C literal for the given type.
241 static ObjCMethodDecl *getNSNumberFactoryMethod(Sema &S, SourceLocation Loc,
243 bool isLiteral = false,
244 SourceRange R = SourceRange()) {
245 Optional<NSAPI::NSNumberLiteralMethodKind> Kind =
246 S.NSAPIObj->getNSNumberFactoryMethodKind(NumberType);
250 S.Diag(Loc, diag::err_invalid_nsnumber_type)
256 // If we already looked up this method, we're done.
257 if (S.NSNumberLiteralMethods[*Kind])
258 return S.NSNumberLiteralMethods[*Kind];
260 Selector Sel = S.NSAPIObj->getNSNumberLiteralSelector(*Kind,
263 ASTContext &CX = S.Context;
265 // Look up the NSNumber class, if we haven't done so already. It's cached
266 // in the Sema instance.
267 if (!S.NSNumberDecl) {
268 S.NSNumberDecl = LookupObjCInterfaceDeclForLiteral(S, Loc,
270 if (!S.NSNumberDecl) {
275 if (S.NSNumberPointer.isNull()) {
276 // generate the pointer to NSNumber type.
277 QualType NSNumberObject = CX.getObjCInterfaceType(S.NSNumberDecl);
278 S.NSNumberPointer = CX.getObjCObjectPointerType(NSNumberObject);
281 // Look for the appropriate method within NSNumber.
282 ObjCMethodDecl *Method = S.NSNumberDecl->lookupClassMethod(Sel);
283 if (!Method && S.getLangOpts().DebuggerObjCLiteral) {
284 // create a stub definition this NSNumber factory method.
285 TypeSourceInfo *ReturnTInfo = nullptr;
287 ObjCMethodDecl::Create(CX, SourceLocation(), SourceLocation(), Sel,
288 S.NSNumberPointer, ReturnTInfo, S.NSNumberDecl,
289 /*isInstance=*/false, /*isVariadic=*/false,
290 /*isPropertyAccessor=*/false,
291 /*isImplicitlyDeclared=*/true,
292 /*isDefined=*/false, ObjCMethodDecl::Required,
293 /*HasRelatedResultType=*/false);
294 ParmVarDecl *value = ParmVarDecl::Create(S.Context, Method,
295 SourceLocation(), SourceLocation(),
296 &CX.Idents.get("value"),
297 NumberType, /*TInfo=*/nullptr,
299 Method->setMethodParams(S.Context, value, None);
302 if (!validateBoxingMethod(S, Loc, S.NSNumberDecl, Sel, Method))
305 // Note: if the parameter type is out-of-line, we'll catch it later in the
306 // implicit conversion.
308 S.NSNumberLiteralMethods[*Kind] = Method;
312 /// BuildObjCNumericLiteral - builds an ObjCBoxedExpr AST node for the
313 /// numeric literal expression. Type of the expression will be "NSNumber *".
314 ExprResult Sema::BuildObjCNumericLiteral(SourceLocation AtLoc, Expr *Number) {
315 // Determine the type of the literal.
316 QualType NumberType = Number->getType();
317 if (CharacterLiteral *Char = dyn_cast<CharacterLiteral>(Number)) {
318 // In C, character literals have type 'int'. That's not the type we want
319 // to use to determine the Objective-c literal kind.
320 switch (Char->getKind()) {
321 case CharacterLiteral::Ascii:
322 case CharacterLiteral::UTF8:
323 NumberType = Context.CharTy;
326 case CharacterLiteral::Wide:
327 NumberType = Context.getWideCharType();
330 case CharacterLiteral::UTF16:
331 NumberType = Context.Char16Ty;
334 case CharacterLiteral::UTF32:
335 NumberType = Context.Char32Ty;
340 // Look for the appropriate method within NSNumber.
341 // Construct the literal.
342 SourceRange NR(Number->getSourceRange());
343 ObjCMethodDecl *Method = getNSNumberFactoryMethod(*this, AtLoc, NumberType,
348 // Convert the number to the type that the parameter expects.
349 ParmVarDecl *ParamDecl = Method->parameters()[0];
350 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
352 ExprResult ConvertedNumber = PerformCopyInitialization(Entity,
355 if (ConvertedNumber.isInvalid())
357 Number = ConvertedNumber.get();
359 // Use the effective source range of the literal, including the leading '@'.
360 return MaybeBindToTemporary(
361 new (Context) ObjCBoxedExpr(Number, NSNumberPointer, Method,
362 SourceRange(AtLoc, NR.getEnd())));
365 ExprResult Sema::ActOnObjCBoolLiteral(SourceLocation AtLoc,
366 SourceLocation ValueLoc,
369 if (getLangOpts().CPlusPlus) {
370 Inner = ActOnCXXBoolLiteral(ValueLoc, Value? tok::kw_true : tok::kw_false);
372 // C doesn't actually have a way to represent literal values of type
373 // _Bool. So, we'll use 0/1 and implicit cast to _Bool.
374 Inner = ActOnIntegerConstant(ValueLoc, Value? 1 : 0);
375 Inner = ImpCastExprToType(Inner.get(), Context.BoolTy,
376 CK_IntegralToBoolean);
379 return BuildObjCNumericLiteral(AtLoc, Inner.get());
382 /// \brief Check that the given expression is a valid element of an Objective-C
383 /// collection literal.
384 static ExprResult CheckObjCCollectionLiteralElement(Sema &S, Expr *Element,
386 bool ArrayLiteral = false) {
387 // If the expression is type-dependent, there's nothing for us to do.
388 if (Element->isTypeDependent())
391 ExprResult Result = S.CheckPlaceholderExpr(Element);
392 if (Result.isInvalid())
394 Element = Result.get();
396 // In C++, check for an implicit conversion to an Objective-C object pointer
398 if (S.getLangOpts().CPlusPlus && Element->getType()->isRecordType()) {
399 InitializedEntity Entity
400 = InitializedEntity::InitializeParameter(S.Context, T,
402 InitializationKind Kind
403 = InitializationKind::CreateCopy(Element->getLocStart(),
405 InitializationSequence Seq(S, Entity, Kind, Element);
407 return Seq.Perform(S, Entity, Kind, Element);
410 Expr *OrigElement = Element;
412 // Perform lvalue-to-rvalue conversion.
413 Result = S.DefaultLvalueConversion(Element);
414 if (Result.isInvalid())
416 Element = Result.get();
418 // Make sure that we have an Objective-C pointer type or block.
419 if (!Element->getType()->isObjCObjectPointerType() &&
420 !Element->getType()->isBlockPointerType()) {
421 bool Recovered = false;
423 // If this is potentially an Objective-C numeric literal, add the '@'.
424 if (isa<IntegerLiteral>(OrigElement) ||
425 isa<CharacterLiteral>(OrigElement) ||
426 isa<FloatingLiteral>(OrigElement) ||
427 isa<ObjCBoolLiteralExpr>(OrigElement) ||
428 isa<CXXBoolLiteralExpr>(OrigElement)) {
429 if (S.NSAPIObj->getNSNumberFactoryMethodKind(OrigElement->getType())) {
430 int Which = isa<CharacterLiteral>(OrigElement) ? 1
431 : (isa<CXXBoolLiteralExpr>(OrigElement) ||
432 isa<ObjCBoolLiteralExpr>(OrigElement)) ? 2
435 S.Diag(OrigElement->getLocStart(), diag::err_box_literal_collection)
436 << Which << OrigElement->getSourceRange()
437 << FixItHint::CreateInsertion(OrigElement->getLocStart(), "@");
439 Result = S.BuildObjCNumericLiteral(OrigElement->getLocStart(),
441 if (Result.isInvalid())
444 Element = Result.get();
448 // If this is potentially an Objective-C string literal, add the '@'.
449 else if (StringLiteral *String = dyn_cast<StringLiteral>(OrigElement)) {
450 if (String->isAscii()) {
451 S.Diag(OrigElement->getLocStart(), diag::err_box_literal_collection)
452 << 0 << OrigElement->getSourceRange()
453 << FixItHint::CreateInsertion(OrigElement->getLocStart(), "@");
455 Result = S.BuildObjCStringLiteral(OrigElement->getLocStart(), String);
456 if (Result.isInvalid())
459 Element = Result.get();
465 S.Diag(Element->getLocStart(), diag::err_invalid_collection_element)
466 << Element->getType();
471 if (ObjCStringLiteral *getString =
472 dyn_cast<ObjCStringLiteral>(OrigElement)) {
473 if (StringLiteral *SL = getString->getString()) {
474 unsigned numConcat = SL->getNumConcatenated();
476 // Only warn if the concatenated string doesn't come from a macro.
477 bool hasMacro = false;
478 for (unsigned i = 0; i < numConcat ; ++i)
479 if (SL->getStrTokenLoc(i).isMacroID()) {
484 S.Diag(Element->getLocStart(),
485 diag::warn_concatenated_nsarray_literal)
486 << Element->getType();
491 // Make sure that the element has the type that the container factory
493 return S.PerformCopyInitialization(
494 InitializedEntity::InitializeParameter(S.Context, T,
496 Element->getLocStart(), Element);
499 ExprResult Sema::BuildObjCBoxedExpr(SourceRange SR, Expr *ValueExpr) {
500 if (ValueExpr->isTypeDependent()) {
501 ObjCBoxedExpr *BoxedExpr =
502 new (Context) ObjCBoxedExpr(ValueExpr, Context.DependentTy, nullptr, SR);
505 ObjCMethodDecl *BoxingMethod = nullptr;
507 // Convert the expression to an RValue, so we can check for pointer types...
508 ExprResult RValue = DefaultFunctionArrayLvalueConversion(ValueExpr);
509 if (RValue.isInvalid()) {
512 SourceLocation Loc = SR.getBegin();
513 ValueExpr = RValue.get();
514 QualType ValueType(ValueExpr->getType());
515 if (const PointerType *PT = ValueType->getAs<PointerType>()) {
516 QualType PointeeType = PT->getPointeeType();
517 if (Context.hasSameUnqualifiedType(PointeeType, Context.CharTy)) {
520 NSStringDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
525 QualType NSStringObject = Context.getObjCInterfaceType(NSStringDecl);
526 NSStringPointer = Context.getObjCObjectPointerType(NSStringObject);
529 if (!StringWithUTF8StringMethod) {
530 IdentifierInfo *II = &Context.Idents.get("stringWithUTF8String");
531 Selector stringWithUTF8String = Context.Selectors.getUnarySelector(II);
533 // Look for the appropriate method within NSString.
534 BoxingMethod = NSStringDecl->lookupClassMethod(stringWithUTF8String);
535 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
536 // Debugger needs to work even if NSString hasn't been defined.
537 TypeSourceInfo *ReturnTInfo = nullptr;
538 ObjCMethodDecl *M = ObjCMethodDecl::Create(
539 Context, SourceLocation(), SourceLocation(), stringWithUTF8String,
540 NSStringPointer, ReturnTInfo, NSStringDecl,
541 /*isInstance=*/false, /*isVariadic=*/false,
542 /*isPropertyAccessor=*/false,
543 /*isImplicitlyDeclared=*/true,
544 /*isDefined=*/false, ObjCMethodDecl::Required,
545 /*HasRelatedResultType=*/false);
546 QualType ConstCharType = Context.CharTy.withConst();
548 ParmVarDecl::Create(Context, M,
549 SourceLocation(), SourceLocation(),
550 &Context.Idents.get("value"),
551 Context.getPointerType(ConstCharType),
554 M->setMethodParams(Context, value, None);
558 if (!validateBoxingMethod(*this, Loc, NSStringDecl,
559 stringWithUTF8String, BoxingMethod))
562 StringWithUTF8StringMethod = BoxingMethod;
565 BoxingMethod = StringWithUTF8StringMethod;
566 BoxedType = NSStringPointer;
568 } else if (ValueType->isBuiltinType()) {
569 // The other types we support are numeric, char and BOOL/bool. We could also
570 // provide limited support for structure types, such as NSRange, NSRect, and
571 // NSSize. See NSValue (NSValueGeometryExtensions) in <Foundation/NSGeometry.h>
574 // Check for a top-level character literal.
575 if (const CharacterLiteral *Char =
576 dyn_cast<CharacterLiteral>(ValueExpr->IgnoreParens())) {
577 // In C, character literals have type 'int'. That's not the type we want
578 // to use to determine the Objective-c literal kind.
579 switch (Char->getKind()) {
580 case CharacterLiteral::Ascii:
581 case CharacterLiteral::UTF8:
582 ValueType = Context.CharTy;
585 case CharacterLiteral::Wide:
586 ValueType = Context.getWideCharType();
589 case CharacterLiteral::UTF16:
590 ValueType = Context.Char16Ty;
593 case CharacterLiteral::UTF32:
594 ValueType = Context.Char32Ty;
598 CheckForIntOverflow(ValueExpr);
599 // FIXME: Do I need to do anything special with BoolTy expressions?
601 // Look for the appropriate method within NSNumber.
602 BoxingMethod = getNSNumberFactoryMethod(*this, Loc, ValueType);
603 BoxedType = NSNumberPointer;
604 } else if (const EnumType *ET = ValueType->getAs<EnumType>()) {
605 if (!ET->getDecl()->isComplete()) {
606 Diag(Loc, diag::err_objc_incomplete_boxed_expression_type)
607 << ValueType << ValueExpr->getSourceRange();
611 BoxingMethod = getNSNumberFactoryMethod(*this, Loc,
612 ET->getDecl()->getIntegerType());
613 BoxedType = NSNumberPointer;
614 } else if (ValueType->isObjCBoxableRecordType()) {
615 // Support for structure types, that marked as objc_boxable
616 // struct __attribute__((objc_boxable)) s { ... };
618 // Look up the NSValue class, if we haven't done so already. It's cached
619 // in the Sema instance.
621 NSValueDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
627 // generate the pointer to NSValue type.
628 QualType NSValueObject = Context.getObjCInterfaceType(NSValueDecl);
629 NSValuePointer = Context.getObjCObjectPointerType(NSValueObject);
632 if (!ValueWithBytesObjCTypeMethod) {
633 IdentifierInfo *II[] = {
634 &Context.Idents.get("valueWithBytes"),
635 &Context.Idents.get("objCType")
637 Selector ValueWithBytesObjCType = Context.Selectors.getSelector(2, II);
639 // Look for the appropriate method within NSValue.
640 BoxingMethod = NSValueDecl->lookupClassMethod(ValueWithBytesObjCType);
641 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
642 // Debugger needs to work even if NSValue hasn't been defined.
643 TypeSourceInfo *ReturnTInfo = nullptr;
644 ObjCMethodDecl *M = ObjCMethodDecl::Create(
648 ValueWithBytesObjCType,
652 /*isInstance=*/false,
653 /*isVariadic=*/false,
654 /*isPropertyAccessor=*/false,
655 /*isImplicitlyDeclared=*/true,
657 ObjCMethodDecl::Required,
658 /*HasRelatedResultType=*/false);
660 SmallVector<ParmVarDecl *, 2> Params;
663 ParmVarDecl::Create(Context, M,
664 SourceLocation(), SourceLocation(),
665 &Context.Idents.get("bytes"),
666 Context.VoidPtrTy.withConst(),
669 Params.push_back(bytes);
671 QualType ConstCharType = Context.CharTy.withConst();
673 ParmVarDecl::Create(Context, M,
674 SourceLocation(), SourceLocation(),
675 &Context.Idents.get("type"),
676 Context.getPointerType(ConstCharType),
679 Params.push_back(type);
681 M->setMethodParams(Context, Params, None);
685 if (!validateBoxingMethod(*this, Loc, NSValueDecl,
686 ValueWithBytesObjCType, BoxingMethod))
689 ValueWithBytesObjCTypeMethod = BoxingMethod;
692 if (!ValueType.isTriviallyCopyableType(Context)) {
693 Diag(Loc, diag::err_objc_non_trivially_copyable_boxed_expression_type)
694 << ValueType << ValueExpr->getSourceRange();
698 BoxingMethod = ValueWithBytesObjCTypeMethod;
699 BoxedType = NSValuePointer;
703 Diag(Loc, diag::err_objc_illegal_boxed_expression_type)
704 << ValueType << ValueExpr->getSourceRange();
708 DiagnoseUseOfDecl(BoxingMethod, Loc);
710 ExprResult ConvertedValueExpr;
711 if (ValueType->isObjCBoxableRecordType()) {
712 InitializedEntity IE = InitializedEntity::InitializeTemporary(ValueType);
713 ConvertedValueExpr = PerformCopyInitialization(IE, ValueExpr->getExprLoc(),
716 // Convert the expression to the type that the parameter requires.
717 ParmVarDecl *ParamDecl = BoxingMethod->parameters()[0];
718 InitializedEntity IE = InitializedEntity::InitializeParameter(Context,
720 ConvertedValueExpr = PerformCopyInitialization(IE, SourceLocation(),
724 if (ConvertedValueExpr.isInvalid())
726 ValueExpr = ConvertedValueExpr.get();
728 ObjCBoxedExpr *BoxedExpr =
729 new (Context) ObjCBoxedExpr(ValueExpr, BoxedType,
731 return MaybeBindToTemporary(BoxedExpr);
734 /// Build an ObjC subscript pseudo-object expression, given that
735 /// that's supported by the runtime.
736 ExprResult Sema::BuildObjCSubscriptExpression(SourceLocation RB, Expr *BaseExpr,
738 ObjCMethodDecl *getterMethod,
739 ObjCMethodDecl *setterMethod) {
740 assert(!LangOpts.isSubscriptPointerArithmetic());
742 // We can't get dependent types here; our callers should have
743 // filtered them out.
744 assert((!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) &&
745 "base or index cannot have dependent type here");
747 // Filter out placeholders in the index. In theory, overloads could
748 // be preserved here, although that might not actually work correctly.
749 ExprResult Result = CheckPlaceholderExpr(IndexExpr);
750 if (Result.isInvalid())
752 IndexExpr = Result.get();
754 // Perform lvalue-to-rvalue conversion on the base.
755 Result = DefaultLvalueConversion(BaseExpr);
756 if (Result.isInvalid())
758 BaseExpr = Result.get();
760 // Build the pseudo-object expression.
761 return new (Context) ObjCSubscriptRefExpr(
762 BaseExpr, IndexExpr, Context.PseudoObjectTy, VK_LValue, OK_ObjCSubscript,
763 getterMethod, setterMethod, RB);
766 ExprResult Sema::BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements) {
767 SourceLocation Loc = SR.getBegin();
770 NSArrayDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
777 // Find the arrayWithObjects:count: method, if we haven't done so already.
778 QualType IdT = Context.getObjCIdType();
779 if (!ArrayWithObjectsMethod) {
781 Sel = NSAPIObj->getNSArraySelector(NSAPI::NSArr_arrayWithObjectsCount);
782 ObjCMethodDecl *Method = NSArrayDecl->lookupClassMethod(Sel);
783 if (!Method && getLangOpts().DebuggerObjCLiteral) {
784 TypeSourceInfo *ReturnTInfo = nullptr;
785 Method = ObjCMethodDecl::Create(
786 Context, SourceLocation(), SourceLocation(), Sel, IdT, ReturnTInfo,
787 Context.getTranslationUnitDecl(), false /*Instance*/,
788 false /*isVariadic*/,
789 /*isPropertyAccessor=*/false,
790 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
791 ObjCMethodDecl::Required, false);
792 SmallVector<ParmVarDecl *, 2> Params;
793 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
796 &Context.Idents.get("objects"),
797 Context.getPointerType(IdT),
800 Params.push_back(objects);
801 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
804 &Context.Idents.get("cnt"),
805 Context.UnsignedLongTy,
806 /*TInfo=*/nullptr, SC_None,
808 Params.push_back(cnt);
809 Method->setMethodParams(Context, Params, None);
812 if (!validateBoxingMethod(*this, Loc, NSArrayDecl, Sel, Method))
815 // Dig out the type that all elements should be converted to.
816 QualType T = Method->parameters()[0]->getType();
817 const PointerType *PtrT = T->getAs<PointerType>();
819 !Context.hasSameUnqualifiedType(PtrT->getPointeeType(), IdT)) {
820 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
822 Diag(Method->parameters()[0]->getLocation(),
823 diag::note_objc_literal_method_param)
825 << Context.getPointerType(IdT.withConst());
829 // Check that the 'count' parameter is integral.
830 if (!Method->parameters()[1]->getType()->isIntegerType()) {
831 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
833 Diag(Method->parameters()[1]->getLocation(),
834 diag::note_objc_literal_method_param)
836 << Method->parameters()[1]->getType()
841 // We've found a good +arrayWithObjects:count: method. Save it!
842 ArrayWithObjectsMethod = Method;
845 QualType ObjectsType = ArrayWithObjectsMethod->parameters()[0]->getType();
846 QualType RequiredType = ObjectsType->castAs<PointerType>()->getPointeeType();
848 // Check that each of the elements provided is valid in a collection literal,
849 // performing conversions as necessary.
850 Expr **ElementsBuffer = Elements.data();
851 for (unsigned I = 0, N = Elements.size(); I != N; ++I) {
852 ExprResult Converted = CheckObjCCollectionLiteralElement(*this,
855 if (Converted.isInvalid())
858 ElementsBuffer[I] = Converted.get();
862 = Context.getObjCObjectPointerType(
863 Context.getObjCInterfaceType(NSArrayDecl));
865 return MaybeBindToTemporary(
866 ObjCArrayLiteral::Create(Context, Elements, Ty,
867 ArrayWithObjectsMethod, SR));
870 ExprResult Sema::BuildObjCDictionaryLiteral(SourceRange SR,
871 MutableArrayRef<ObjCDictionaryElement> Elements) {
872 SourceLocation Loc = SR.getBegin();
874 if (!NSDictionaryDecl) {
875 NSDictionaryDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
876 Sema::LK_Dictionary);
877 if (!NSDictionaryDecl) {
882 // Find the dictionaryWithObjects:forKeys:count: method, if we haven't done
884 QualType IdT = Context.getObjCIdType();
885 if (!DictionaryWithObjectsMethod) {
886 Selector Sel = NSAPIObj->getNSDictionarySelector(
887 NSAPI::NSDict_dictionaryWithObjectsForKeysCount);
888 ObjCMethodDecl *Method = NSDictionaryDecl->lookupClassMethod(Sel);
889 if (!Method && getLangOpts().DebuggerObjCLiteral) {
890 Method = ObjCMethodDecl::Create(Context,
891 SourceLocation(), SourceLocation(), Sel,
893 nullptr /*TypeSourceInfo */,
894 Context.getTranslationUnitDecl(),
895 false /*Instance*/, false/*isVariadic*/,
896 /*isPropertyAccessor=*/false,
897 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
898 ObjCMethodDecl::Required,
900 SmallVector<ParmVarDecl *, 3> Params;
901 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
904 &Context.Idents.get("objects"),
905 Context.getPointerType(IdT),
906 /*TInfo=*/nullptr, SC_None,
908 Params.push_back(objects);
909 ParmVarDecl *keys = ParmVarDecl::Create(Context, Method,
912 &Context.Idents.get("keys"),
913 Context.getPointerType(IdT),
914 /*TInfo=*/nullptr, SC_None,
916 Params.push_back(keys);
917 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
920 &Context.Idents.get("cnt"),
921 Context.UnsignedLongTy,
922 /*TInfo=*/nullptr, SC_None,
924 Params.push_back(cnt);
925 Method->setMethodParams(Context, Params, None);
928 if (!validateBoxingMethod(*this, SR.getBegin(), NSDictionaryDecl, Sel,
932 // Dig out the type that all values should be converted to.
933 QualType ValueT = Method->parameters()[0]->getType();
934 const PointerType *PtrValue = ValueT->getAs<PointerType>();
936 !Context.hasSameUnqualifiedType(PtrValue->getPointeeType(), IdT)) {
937 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
939 Diag(Method->parameters()[0]->getLocation(),
940 diag::note_objc_literal_method_param)
942 << Context.getPointerType(IdT.withConst());
946 // Dig out the type that all keys should be converted to.
947 QualType KeyT = Method->parameters()[1]->getType();
948 const PointerType *PtrKey = KeyT->getAs<PointerType>();
950 !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
954 if (QIDNSCopying.isNull()) {
955 // key argument of selector is id<NSCopying>?
956 if (ObjCProtocolDecl *NSCopyingPDecl =
957 LookupProtocol(&Context.Idents.get("NSCopying"), SR.getBegin())) {
958 ObjCProtocolDecl *PQ[] = {NSCopyingPDecl};
960 Context.getObjCObjectType(Context.ObjCBuiltinIdTy, { },
962 (ObjCProtocolDecl**) PQ,
965 QIDNSCopying = Context.getObjCObjectPointerType(QIDNSCopying);
968 if (!QIDNSCopying.isNull())
969 err = !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
974 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
976 Diag(Method->parameters()[1]->getLocation(),
977 diag::note_objc_literal_method_param)
979 << Context.getPointerType(IdT.withConst());
984 // Check that the 'count' parameter is integral.
985 QualType CountType = Method->parameters()[2]->getType();
986 if (!CountType->isIntegerType()) {
987 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
989 Diag(Method->parameters()[2]->getLocation(),
990 diag::note_objc_literal_method_param)
996 // We've found a good +dictionaryWithObjects:keys:count: method; save it!
997 DictionaryWithObjectsMethod = Method;
1000 QualType ValuesT = DictionaryWithObjectsMethod->parameters()[0]->getType();
1001 QualType ValueT = ValuesT->castAs<PointerType>()->getPointeeType();
1002 QualType KeysT = DictionaryWithObjectsMethod->parameters()[1]->getType();
1003 QualType KeyT = KeysT->castAs<PointerType>()->getPointeeType();
1005 // Check that each of the keys and values provided is valid in a collection
1006 // literal, performing conversions as necessary.
1007 bool HasPackExpansions = false;
1008 for (ObjCDictionaryElement &Element : Elements) {
1010 ExprResult Key = CheckObjCCollectionLiteralElement(*this, Element.Key,
1012 if (Key.isInvalid())
1017 = CheckObjCCollectionLiteralElement(*this, Element.Value, ValueT);
1018 if (Value.isInvalid())
1021 Element.Key = Key.get();
1022 Element.Value = Value.get();
1024 if (Element.EllipsisLoc.isInvalid())
1027 if (!Element.Key->containsUnexpandedParameterPack() &&
1028 !Element.Value->containsUnexpandedParameterPack()) {
1029 Diag(Element.EllipsisLoc,
1030 diag::err_pack_expansion_without_parameter_packs)
1031 << SourceRange(Element.Key->getLocStart(),
1032 Element.Value->getLocEnd());
1036 HasPackExpansions = true;
1040 = Context.getObjCObjectPointerType(
1041 Context.getObjCInterfaceType(NSDictionaryDecl));
1042 return MaybeBindToTemporary(ObjCDictionaryLiteral::Create(
1043 Context, Elements, HasPackExpansions, Ty,
1044 DictionaryWithObjectsMethod, SR));
1047 ExprResult Sema::BuildObjCEncodeExpression(SourceLocation AtLoc,
1048 TypeSourceInfo *EncodedTypeInfo,
1049 SourceLocation RParenLoc) {
1050 QualType EncodedType = EncodedTypeInfo->getType();
1052 if (EncodedType->isDependentType())
1053 StrTy = Context.DependentTy;
1055 if (!EncodedType->getAsArrayTypeUnsafe() && //// Incomplete array is handled.
1056 !EncodedType->isVoidType()) // void is handled too.
1057 if (RequireCompleteType(AtLoc, EncodedType,
1058 diag::err_incomplete_type_objc_at_encode,
1059 EncodedTypeInfo->getTypeLoc()))
1063 QualType NotEncodedT;
1064 Context.getObjCEncodingForType(EncodedType, Str, nullptr, &NotEncodedT);
1065 if (!NotEncodedT.isNull())
1066 Diag(AtLoc, diag::warn_incomplete_encoded_type)
1067 << EncodedType << NotEncodedT;
1069 // The type of @encode is the same as the type of the corresponding string,
1070 // which is an array type.
1071 StrTy = Context.CharTy;
1072 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
1073 if (getLangOpts().CPlusPlus || getLangOpts().ConstStrings)
1075 StrTy = Context.getConstantArrayType(StrTy, llvm::APInt(32, Str.size()+1),
1076 ArrayType::Normal, 0);
1079 return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc);
1082 ExprResult Sema::ParseObjCEncodeExpression(SourceLocation AtLoc,
1083 SourceLocation EncodeLoc,
1084 SourceLocation LParenLoc,
1086 SourceLocation RParenLoc) {
1087 // FIXME: Preserve type source info ?
1088 TypeSourceInfo *TInfo;
1089 QualType EncodedType = GetTypeFromParser(ty, &TInfo);
1091 TInfo = Context.getTrivialTypeSourceInfo(EncodedType,
1092 getLocForEndOfToken(LParenLoc));
1094 return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc);
1097 static bool HelperToDiagnoseMismatchedMethodsInGlobalPool(Sema &S,
1098 SourceLocation AtLoc,
1099 SourceLocation LParenLoc,
1100 SourceLocation RParenLoc,
1101 ObjCMethodDecl *Method,
1102 ObjCMethodList &MethList) {
1103 ObjCMethodList *M = &MethList;
1104 bool Warned = false;
1105 for (M = M->getNext(); M; M=M->getNext()) {
1106 ObjCMethodDecl *MatchingMethodDecl = M->getMethod();
1107 if (MatchingMethodDecl == Method ||
1108 isa<ObjCImplDecl>(MatchingMethodDecl->getDeclContext()) ||
1109 MatchingMethodDecl->getSelector() != Method->getSelector())
1111 if (!S.MatchTwoMethodDeclarations(Method,
1112 MatchingMethodDecl, Sema::MMS_loose)) {
1115 S.Diag(AtLoc, diag::warn_multiple_selectors)
1116 << Method->getSelector() << FixItHint::CreateInsertion(LParenLoc, "(")
1117 << FixItHint::CreateInsertion(RParenLoc, ")");
1118 S.Diag(Method->getLocation(), diag::note_method_declared_at)
1119 << Method->getDeclName();
1121 S.Diag(MatchingMethodDecl->getLocation(), diag::note_method_declared_at)
1122 << MatchingMethodDecl->getDeclName();
1128 static void DiagnoseMismatchedSelectors(Sema &S, SourceLocation AtLoc,
1129 ObjCMethodDecl *Method,
1130 SourceLocation LParenLoc,
1131 SourceLocation RParenLoc,
1132 bool WarnMultipleSelectors) {
1133 if (!WarnMultipleSelectors ||
1134 S.Diags.isIgnored(diag::warn_multiple_selectors, SourceLocation()))
1136 bool Warned = false;
1137 for (Sema::GlobalMethodPool::iterator b = S.MethodPool.begin(),
1138 e = S.MethodPool.end(); b != e; b++) {
1139 // first, instance methods
1140 ObjCMethodList &InstMethList = b->second.first;
1141 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1142 Method, InstMethList))
1145 // second, class methods
1146 ObjCMethodList &ClsMethList = b->second.second;
1147 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1148 Method, ClsMethList) || Warned)
1153 ExprResult Sema::ParseObjCSelectorExpression(Selector Sel,
1154 SourceLocation AtLoc,
1155 SourceLocation SelLoc,
1156 SourceLocation LParenLoc,
1157 SourceLocation RParenLoc,
1158 bool WarnMultipleSelectors) {
1159 ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel,
1160 SourceRange(LParenLoc, RParenLoc));
1162 Method = LookupFactoryMethodInGlobalPool(Sel,
1163 SourceRange(LParenLoc, RParenLoc));
1165 if (const ObjCMethodDecl *OM = SelectorsForTypoCorrection(Sel)) {
1166 Selector MatchedSel = OM->getSelector();
1167 SourceRange SelectorRange(LParenLoc.getLocWithOffset(1),
1168 RParenLoc.getLocWithOffset(-1));
1169 Diag(SelLoc, diag::warn_undeclared_selector_with_typo)
1170 << Sel << MatchedSel
1171 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1174 Diag(SelLoc, diag::warn_undeclared_selector) << Sel;
1176 DiagnoseMismatchedSelectors(*this, AtLoc, Method, LParenLoc, RParenLoc,
1177 WarnMultipleSelectors);
1180 Method->getImplementationControl() != ObjCMethodDecl::Optional &&
1181 !getSourceManager().isInSystemHeader(Method->getLocation()))
1182 ReferencedSelectors.insert(std::make_pair(Sel, AtLoc));
1184 // In ARC, forbid the user from using @selector for
1185 // retain/release/autorelease/dealloc/retainCount.
1186 if (getLangOpts().ObjCAutoRefCount) {
1187 switch (Sel.getMethodFamily()) {
1190 case OMF_autorelease:
1191 case OMF_retainCount:
1193 Diag(AtLoc, diag::err_arc_illegal_selector) <<
1194 Sel << SourceRange(LParenLoc, RParenLoc);
1202 case OMF_mutableCopy:
1205 case OMF_initialize:
1206 case OMF_performSelector:
1210 QualType Ty = Context.getObjCSelType();
1211 return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc);
1214 ExprResult Sema::ParseObjCProtocolExpression(IdentifierInfo *ProtocolId,
1215 SourceLocation AtLoc,
1216 SourceLocation ProtoLoc,
1217 SourceLocation LParenLoc,
1218 SourceLocation ProtoIdLoc,
1219 SourceLocation RParenLoc) {
1220 ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoIdLoc);
1222 Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId;
1225 if (PDecl->hasDefinition())
1226 PDecl = PDecl->getDefinition();
1228 QualType Ty = Context.getObjCProtoType();
1231 Ty = Context.getObjCObjectPointerType(Ty);
1232 return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, ProtoIdLoc, RParenLoc);
1235 /// Try to capture an implicit reference to 'self'.
1236 ObjCMethodDecl *Sema::tryCaptureObjCSelf(SourceLocation Loc) {
1237 DeclContext *DC = getFunctionLevelDeclContext();
1239 // If we're not in an ObjC method, error out. Note that, unlike the
1240 // C++ case, we don't require an instance method --- class methods
1241 // still have a 'self', and we really do still need to capture it!
1242 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(DC);
1246 tryCaptureVariable(method->getSelfDecl(), Loc);
1251 static QualType stripObjCInstanceType(ASTContext &Context, QualType T) {
1252 QualType origType = T;
1253 if (auto nullability = AttributedType::stripOuterNullability(T)) {
1254 if (T == Context.getObjCInstanceType()) {
1255 return Context.getAttributedType(
1256 AttributedType::getNullabilityAttrKind(*nullability),
1257 Context.getObjCIdType(),
1258 Context.getObjCIdType());
1264 if (T == Context.getObjCInstanceType())
1265 return Context.getObjCIdType();
1270 /// Determine the result type of a message send based on the receiver type,
1271 /// method, and the kind of message send.
1273 /// This is the "base" result type, which will still need to be adjusted
1274 /// to account for nullability.
1275 static QualType getBaseMessageSendResultType(Sema &S,
1276 QualType ReceiverType,
1277 ObjCMethodDecl *Method,
1278 bool isClassMessage,
1279 bool isSuperMessage) {
1280 assert(Method && "Must have a method");
1281 if (!Method->hasRelatedResultType())
1282 return Method->getSendResultType(ReceiverType);
1284 ASTContext &Context = S.Context;
1286 // Local function that transfers the nullability of the method's
1287 // result type to the returned result.
1288 auto transferNullability = [&](QualType type) -> QualType {
1289 // If the method's result type has nullability, extract it.
1290 if (auto nullability = Method->getSendResultType(ReceiverType)
1291 ->getNullability(Context)){
1292 // Strip off any outer nullability sugar from the provided type.
1293 (void)AttributedType::stripOuterNullability(type);
1295 // Form a new attributed type using the method result type's nullability.
1296 return Context.getAttributedType(
1297 AttributedType::getNullabilityAttrKind(*nullability),
1305 // If a method has a related return type:
1306 // - if the method found is an instance method, but the message send
1307 // was a class message send, T is the declared return type of the method
1309 if (Method->isInstanceMethod() && isClassMessage)
1310 return stripObjCInstanceType(Context,
1311 Method->getSendResultType(ReceiverType));
1313 // - if the receiver is super, T is a pointer to the class of the
1314 // enclosing method definition
1315 if (isSuperMessage) {
1316 if (ObjCMethodDecl *CurMethod = S.getCurMethodDecl())
1317 if (ObjCInterfaceDecl *Class = CurMethod->getClassInterface()) {
1318 return transferNullability(
1319 Context.getObjCObjectPointerType(
1320 Context.getObjCInterfaceType(Class)));
1324 // - if the receiver is the name of a class U, T is a pointer to U
1325 if (ReceiverType->getAsObjCInterfaceType())
1326 return transferNullability(Context.getObjCObjectPointerType(ReceiverType));
1327 // - if the receiver is of type Class or qualified Class type,
1328 // T is the declared return type of the method.
1329 if (ReceiverType->isObjCClassType() ||
1330 ReceiverType->isObjCQualifiedClassType())
1331 return stripObjCInstanceType(Context,
1332 Method->getSendResultType(ReceiverType));
1334 // - if the receiver is id, qualified id, Class, or qualified Class, T
1335 // is the receiver type, otherwise
1336 // - T is the type of the receiver expression.
1337 return transferNullability(ReceiverType);
1340 QualType Sema::getMessageSendResultType(QualType ReceiverType,
1341 ObjCMethodDecl *Method,
1342 bool isClassMessage,
1343 bool isSuperMessage) {
1344 // Produce the result type.
1345 QualType resultType = getBaseMessageSendResultType(*this, ReceiverType,
1350 // If this is a class message, ignore the nullability of the receiver.
1354 // Map the nullability of the result into a table index.
1355 unsigned receiverNullabilityIdx = 0;
1356 if (auto nullability = ReceiverType->getNullability(Context))
1357 receiverNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1359 unsigned resultNullabilityIdx = 0;
1360 if (auto nullability = resultType->getNullability(Context))
1361 resultNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1363 // The table of nullability mappings, indexed by the receiver's nullability
1364 // and then the result type's nullability.
1365 static const uint8_t None = 0;
1366 static const uint8_t NonNull = 1;
1367 static const uint8_t Nullable = 2;
1368 static const uint8_t Unspecified = 3;
1369 static const uint8_t nullabilityMap[4][4] = {
1370 // None NonNull Nullable Unspecified
1371 /* None */ { None, None, Nullable, None },
1372 /* NonNull */ { None, NonNull, Nullable, Unspecified },
1373 /* Nullable */ { Nullable, Nullable, Nullable, Nullable },
1374 /* Unspecified */ { None, Unspecified, Nullable, Unspecified }
1377 unsigned newResultNullabilityIdx
1378 = nullabilityMap[receiverNullabilityIdx][resultNullabilityIdx];
1379 if (newResultNullabilityIdx == resultNullabilityIdx)
1382 // Strip off the existing nullability. This removes as little type sugar as
1385 if (auto attributed = dyn_cast<AttributedType>(resultType.getTypePtr())) {
1386 resultType = attributed->getModifiedType();
1388 resultType = resultType.getDesugaredType(Context);
1390 } while (resultType->getNullability(Context));
1392 // Add nullability back if needed.
1393 if (newResultNullabilityIdx > 0) {
1395 = static_cast<NullabilityKind>(newResultNullabilityIdx-1);
1396 return Context.getAttributedType(
1397 AttributedType::getNullabilityAttrKind(newNullability),
1398 resultType, resultType);
1404 /// Look for an ObjC method whose result type exactly matches the given type.
1405 static const ObjCMethodDecl *
1406 findExplicitInstancetypeDeclarer(const ObjCMethodDecl *MD,
1407 QualType instancetype) {
1408 if (MD->getReturnType() == instancetype)
1411 // For these purposes, a method in an @implementation overrides a
1412 // declaration in the @interface.
1413 if (const ObjCImplDecl *impl =
1414 dyn_cast<ObjCImplDecl>(MD->getDeclContext())) {
1415 const ObjCContainerDecl *iface;
1416 if (const ObjCCategoryImplDecl *catImpl =
1417 dyn_cast<ObjCCategoryImplDecl>(impl)) {
1418 iface = catImpl->getCategoryDecl();
1420 iface = impl->getClassInterface();
1423 const ObjCMethodDecl *ifaceMD =
1424 iface->getMethod(MD->getSelector(), MD->isInstanceMethod());
1425 if (ifaceMD) return findExplicitInstancetypeDeclarer(ifaceMD, instancetype);
1428 SmallVector<const ObjCMethodDecl *, 4> overrides;
1429 MD->getOverriddenMethods(overrides);
1430 for (unsigned i = 0, e = overrides.size(); i != e; ++i) {
1431 if (const ObjCMethodDecl *result =
1432 findExplicitInstancetypeDeclarer(overrides[i], instancetype))
1439 void Sema::EmitRelatedResultTypeNoteForReturn(QualType destType) {
1440 // Only complain if we're in an ObjC method and the required return
1441 // type doesn't match the method's declared return type.
1442 ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurContext);
1443 if (!MD || !MD->hasRelatedResultType() ||
1444 Context.hasSameUnqualifiedType(destType, MD->getReturnType()))
1447 // Look for a method overridden by this method which explicitly uses
1449 if (const ObjCMethodDecl *overridden =
1450 findExplicitInstancetypeDeclarer(MD, Context.getObjCInstanceType())) {
1451 SourceRange range = overridden->getReturnTypeSourceRange();
1452 SourceLocation loc = range.getBegin();
1453 if (loc.isInvalid())
1454 loc = overridden->getLocation();
1455 Diag(loc, diag::note_related_result_type_explicit)
1456 << /*current method*/ 1 << range;
1460 // Otherwise, if we have an interesting method family, note that.
1461 // This should always trigger if the above didn't.
1462 if (ObjCMethodFamily family = MD->getMethodFamily())
1463 Diag(MD->getLocation(), diag::note_related_result_type_family)
1464 << /*current method*/ 1
1468 void Sema::EmitRelatedResultTypeNote(const Expr *E) {
1469 E = E->IgnoreParenImpCasts();
1470 const ObjCMessageExpr *MsgSend = dyn_cast<ObjCMessageExpr>(E);
1474 const ObjCMethodDecl *Method = MsgSend->getMethodDecl();
1478 if (!Method->hasRelatedResultType())
1481 if (Context.hasSameUnqualifiedType(
1482 Method->getReturnType().getNonReferenceType(), MsgSend->getType()))
1485 if (!Context.hasSameUnqualifiedType(Method->getReturnType(),
1486 Context.getObjCInstanceType()))
1489 Diag(Method->getLocation(), diag::note_related_result_type_inferred)
1490 << Method->isInstanceMethod() << Method->getSelector()
1491 << MsgSend->getType();
1494 bool Sema::CheckMessageArgumentTypes(QualType ReceiverType,
1497 ArrayRef<SourceLocation> SelectorLocs,
1498 ObjCMethodDecl *Method,
1499 bool isClassMessage, bool isSuperMessage,
1500 SourceLocation lbrac, SourceLocation rbrac,
1501 SourceRange RecRange,
1502 QualType &ReturnType, ExprValueKind &VK) {
1503 SourceLocation SelLoc;
1504 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
1505 SelLoc = SelectorLocs.front();
1510 // Apply default argument promotion as for (C99 6.5.2.2p6).
1511 for (unsigned i = 0, e = Args.size(); i != e; i++) {
1512 if (Args[i]->isTypeDependent())
1516 if (getLangOpts().DebuggerSupport) {
1517 QualType paramTy; // ignored
1518 result = checkUnknownAnyArg(SelLoc, Args[i], paramTy);
1520 result = DefaultArgumentPromotion(Args[i]);
1522 if (result.isInvalid())
1524 Args[i] = result.get();
1528 if (getLangOpts().ObjCAutoRefCount)
1529 DiagID = diag::err_arc_method_not_found;
1531 DiagID = isClassMessage ? diag::warn_class_method_not_found
1532 : diag::warn_inst_method_not_found;
1533 if (!getLangOpts().DebuggerSupport) {
1534 const ObjCMethodDecl *OMD = SelectorsForTypoCorrection(Sel, ReceiverType);
1535 if (OMD && !OMD->isInvalidDecl()) {
1536 if (getLangOpts().ObjCAutoRefCount)
1537 DiagID = diag::err_method_not_found_with_typo;
1539 DiagID = isClassMessage ? diag::warn_class_method_not_found_with_typo
1540 : diag::warn_instance_method_not_found_with_typo;
1541 Selector MatchedSel = OMD->getSelector();
1542 SourceRange SelectorRange(SelectorLocs.front(), SelectorLocs.back());
1543 if (MatchedSel.isUnarySelector())
1544 Diag(SelLoc, DiagID)
1545 << Sel<< isClassMessage << MatchedSel
1546 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1548 Diag(SelLoc, DiagID) << Sel<< isClassMessage << MatchedSel;
1551 Diag(SelLoc, DiagID)
1552 << Sel << isClassMessage << SourceRange(SelectorLocs.front(),
1553 SelectorLocs.back());
1554 // Find the class to which we are sending this message.
1555 if (ReceiverType->isObjCObjectPointerType()) {
1556 if (ObjCInterfaceDecl *ThisClass =
1557 ReceiverType->getAs<ObjCObjectPointerType>()->getInterfaceDecl()) {
1558 Diag(ThisClass->getLocation(), diag::note_receiver_class_declared);
1559 if (!RecRange.isInvalid())
1560 if (ThisClass->lookupClassMethod(Sel))
1561 Diag(RecRange.getBegin(),diag::note_receiver_expr_here)
1562 << FixItHint::CreateReplacement(RecRange,
1563 ThisClass->getNameAsString());
1568 // In debuggers, we want to use __unknown_anytype for these
1569 // results so that clients can cast them.
1570 if (getLangOpts().DebuggerSupport) {
1571 ReturnType = Context.UnknownAnyTy;
1573 ReturnType = Context.getObjCIdType();
1579 ReturnType = getMessageSendResultType(ReceiverType, Method, isClassMessage,
1581 VK = Expr::getValueKindForType(Method->getReturnType());
1583 unsigned NumNamedArgs = Sel.getNumArgs();
1584 // Method might have more arguments than selector indicates. This is due
1585 // to addition of c-style arguments in method.
1586 if (Method->param_size() > Sel.getNumArgs())
1587 NumNamedArgs = Method->param_size();
1588 // FIXME. This need be cleaned up.
1589 if (Args.size() < NumNamedArgs) {
1590 Diag(SelLoc, diag::err_typecheck_call_too_few_args)
1591 << 2 << NumNamedArgs << static_cast<unsigned>(Args.size());
1595 // Compute the set of type arguments to be substituted into each parameter
1597 Optional<ArrayRef<QualType>> typeArgs
1598 = ReceiverType->getObjCSubstitutions(Method->getDeclContext());
1599 bool IsError = false;
1600 for (unsigned i = 0; i < NumNamedArgs; i++) {
1601 // We can't do any type-checking on a type-dependent argument.
1602 if (Args[i]->isTypeDependent())
1605 Expr *argExpr = Args[i];
1607 ParmVarDecl *param = Method->parameters()[i];
1608 assert(argExpr && "CheckMessageArgumentTypes(): missing expression");
1610 // Strip the unbridged-cast placeholder expression off unless it's
1611 // a consumed argument.
1612 if (argExpr->hasPlaceholderType(BuiltinType::ARCUnbridgedCast) &&
1613 !param->hasAttr<CFConsumedAttr>())
1614 argExpr = stripARCUnbridgedCast(argExpr);
1616 // If the parameter is __unknown_anytype, infer its type
1617 // from the argument.
1618 if (param->getType() == Context.UnknownAnyTy) {
1620 ExprResult argE = checkUnknownAnyArg(SelLoc, argExpr, paramType);
1621 if (argE.isInvalid()) {
1624 Args[i] = argE.get();
1626 // Update the parameter type in-place.
1627 param->setType(paramType);
1632 QualType origParamType = param->getType();
1633 QualType paramType = param->getType();
1635 paramType = paramType.substObjCTypeArgs(
1638 ObjCSubstitutionContext::Parameter);
1640 if (RequireCompleteType(argExpr->getSourceRange().getBegin(),
1642 diag::err_call_incomplete_argument, argExpr))
1645 InitializedEntity Entity
1646 = InitializedEntity::InitializeParameter(Context, param, paramType);
1647 ExprResult ArgE = PerformCopyInitialization(Entity, SourceLocation(), argExpr);
1648 if (ArgE.isInvalid())
1651 Args[i] = ArgE.getAs<Expr>();
1653 // If we are type-erasing a block to a block-compatible
1654 // Objective-C pointer type, we may need to extend the lifetime
1655 // of the block object.
1656 if (typeArgs && Args[i]->isRValue() && paramType->isBlockPointerType() &&
1657 Args[i]->getType()->isBlockPointerType() &&
1658 origParamType->isObjCObjectPointerType()) {
1659 ExprResult arg = Args[i];
1660 maybeExtendBlockObject(arg);
1661 Args[i] = arg.get();
1666 // Promote additional arguments to variadic methods.
1667 if (Method->isVariadic()) {
1668 for (unsigned i = NumNamedArgs, e = Args.size(); i < e; ++i) {
1669 if (Args[i]->isTypeDependent())
1672 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod,
1674 IsError |= Arg.isInvalid();
1675 Args[i] = Arg.get();
1678 // Check for extra arguments to non-variadic methods.
1679 if (Args.size() != NumNamedArgs) {
1680 Diag(Args[NumNamedArgs]->getLocStart(),
1681 diag::err_typecheck_call_too_many_args)
1682 << 2 /*method*/ << NumNamedArgs << static_cast<unsigned>(Args.size())
1683 << Method->getSourceRange()
1684 << SourceRange(Args[NumNamedArgs]->getLocStart(),
1685 Args.back()->getLocEnd());
1689 DiagnoseSentinelCalls(Method, SelLoc, Args);
1691 // Do additional checkings on method.
1692 IsError |= CheckObjCMethodCall(
1693 Method, SelLoc, makeArrayRef(Args.data(), Args.size()));
1698 bool Sema::isSelfExpr(Expr *RExpr) {
1699 // 'self' is objc 'self' in an objc method only.
1700 ObjCMethodDecl *Method =
1701 dyn_cast_or_null<ObjCMethodDecl>(CurContext->getNonClosureAncestor());
1702 return isSelfExpr(RExpr, Method);
1705 bool Sema::isSelfExpr(Expr *receiver, const ObjCMethodDecl *method) {
1706 if (!method) return false;
1708 receiver = receiver->IgnoreParenLValueCasts();
1709 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(receiver))
1710 if (DRE->getDecl() == method->getSelfDecl())
1715 /// LookupMethodInType - Look up a method in an ObjCObjectType.
1716 ObjCMethodDecl *Sema::LookupMethodInObjectType(Selector sel, QualType type,
1718 const ObjCObjectType *objType = type->castAs<ObjCObjectType>();
1719 if (ObjCInterfaceDecl *iface = objType->getInterface()) {
1720 // Look it up in the main interface (and categories, etc.)
1721 if (ObjCMethodDecl *method = iface->lookupMethod(sel, isInstance))
1724 // Okay, look for "private" methods declared in any
1725 // @implementations we've seen.
1726 if (ObjCMethodDecl *method = iface->lookupPrivateMethod(sel, isInstance))
1730 // Check qualifiers.
1731 for (const auto *I : objType->quals())
1732 if (ObjCMethodDecl *method = I->lookupMethod(sel, isInstance))
1738 /// LookupMethodInQualifiedType - Lookups up a method in protocol qualifier
1739 /// list of a qualified objective pointer type.
1740 ObjCMethodDecl *Sema::LookupMethodInQualifiedType(Selector Sel,
1741 const ObjCObjectPointerType *OPT,
1744 ObjCMethodDecl *MD = nullptr;
1745 for (const auto *PROTO : OPT->quals()) {
1746 if ((MD = PROTO->lookupMethod(Sel, Instance))) {
1753 /// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an
1754 /// objective C interface. This is a property reference expression.
1756 HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT,
1757 Expr *BaseExpr, SourceLocation OpLoc,
1758 DeclarationName MemberName,
1759 SourceLocation MemberLoc,
1760 SourceLocation SuperLoc, QualType SuperType,
1762 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType();
1763 ObjCInterfaceDecl *IFace = IFaceT->getDecl();
1765 if (!MemberName.isIdentifier()) {
1766 Diag(MemberLoc, diag::err_invalid_property_name)
1767 << MemberName << QualType(OPT, 0);
1771 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1773 SourceRange BaseRange = Super? SourceRange(SuperLoc)
1774 : BaseExpr->getSourceRange();
1775 if (RequireCompleteType(MemberLoc, OPT->getPointeeType(),
1776 diag::err_property_not_found_forward_class,
1777 MemberName, BaseRange))
1780 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(
1781 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1782 // Check whether we can reference this property.
1783 if (DiagnoseUseOfDecl(PD, MemberLoc))
1786 return new (Context)
1787 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1788 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1790 return new (Context)
1791 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1792 OK_ObjCProperty, MemberLoc, BaseExpr);
1794 // Check protocols on qualified interfaces.
1795 for (const auto *I : OPT->quals())
1796 if (ObjCPropertyDecl *PD = I->FindPropertyDeclaration(
1797 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1798 // Check whether we can reference this property.
1799 if (DiagnoseUseOfDecl(PD, MemberLoc))
1803 return new (Context) ObjCPropertyRefExpr(
1804 PD, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty, MemberLoc,
1805 SuperLoc, SuperType);
1807 return new (Context)
1808 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1809 OK_ObjCProperty, MemberLoc, BaseExpr);
1811 // If that failed, look for an "implicit" property by seeing if the nullary
1812 // selector is implemented.
1814 // FIXME: The logic for looking up nullary and unary selectors should be
1815 // shared with the code in ActOnInstanceMessage.
1817 Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
1818 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
1820 // May be found in property's qualified list.
1822 Getter = LookupMethodInQualifiedType(Sel, OPT, true);
1824 // If this reference is in an @implementation, check for 'private' methods.
1826 Getter = IFace->lookupPrivateMethod(Sel);
1829 // Check if we can reference this property.
1830 if (DiagnoseUseOfDecl(Getter, MemberLoc))
1833 // If we found a getter then this may be a valid dot-reference, we
1834 // will look for the matching setter, in case it is needed.
1835 Selector SetterSel =
1836 SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
1837 PP.getSelectorTable(), Member);
1838 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel);
1840 // May be found in property's qualified list.
1842 Setter = LookupMethodInQualifiedType(SetterSel, OPT, true);
1845 // If this reference is in an @implementation, also check for 'private'
1847 Setter = IFace->lookupPrivateMethod(SetterSel);
1850 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
1853 // Special warning if member name used in a property-dot for a setter accessor
1854 // does not use a property with same name; e.g. obj.X = ... for a property with
1856 if (Setter && Setter->isImplicit() && Setter->isPropertyAccessor() &&
1857 !IFace->FindPropertyDeclaration(
1858 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1859 if (const ObjCPropertyDecl *PDecl = Setter->findPropertyDecl()) {
1860 // Do not warn if user is using property-dot syntax to make call to
1861 // user named setter.
1862 if (!(PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter))
1864 diag::warn_property_access_suggest)
1865 << MemberName << QualType(OPT, 0) << PDecl->getName()
1866 << FixItHint::CreateReplacement(MemberLoc, PDecl->getName());
1870 if (Getter || Setter) {
1872 return new (Context)
1873 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1874 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1876 return new (Context)
1877 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1878 OK_ObjCProperty, MemberLoc, BaseExpr);
1882 // Attempt to correct for typos in property names.
1883 if (TypoCorrection Corrected =
1884 CorrectTypo(DeclarationNameInfo(MemberName, MemberLoc),
1885 LookupOrdinaryName, nullptr, nullptr,
1886 llvm::make_unique<DeclFilterCCC<ObjCPropertyDecl>>(),
1887 CTK_ErrorRecovery, IFace, false, OPT)) {
1888 DeclarationName TypoResult = Corrected.getCorrection();
1889 if (TypoResult.isIdentifier() &&
1890 TypoResult.getAsIdentifierInfo() == Member) {
1891 // There is no need to try the correction if it is the same.
1892 NamedDecl *ChosenDecl =
1893 Corrected.isKeyword() ? nullptr : Corrected.getFoundDecl();
1894 if (ChosenDecl && isa<ObjCPropertyDecl>(ChosenDecl))
1895 if (cast<ObjCPropertyDecl>(ChosenDecl)->isClassProperty()) {
1896 // This is a class property, we should not use the instance to
1898 Diag(MemberLoc, diag::err_class_property_found) << MemberName
1899 << OPT->getInterfaceDecl()->getName()
1900 << FixItHint::CreateReplacement(BaseExpr->getSourceRange(),
1901 OPT->getInterfaceDecl()->getName());
1905 diagnoseTypo(Corrected, PDiag(diag::err_property_not_found_suggest)
1906 << MemberName << QualType(OPT, 0));
1907 return HandleExprPropertyRefExpr(OPT, BaseExpr, OpLoc,
1908 TypoResult, MemberLoc,
1909 SuperLoc, SuperType, Super);
1912 ObjCInterfaceDecl *ClassDeclared;
1913 if (ObjCIvarDecl *Ivar =
1914 IFace->lookupInstanceVariable(Member, ClassDeclared)) {
1915 QualType T = Ivar->getType();
1916 if (const ObjCObjectPointerType * OBJPT =
1917 T->getAsObjCInterfacePointerType()) {
1918 if (RequireCompleteType(MemberLoc, OBJPT->getPointeeType(),
1919 diag::err_property_not_as_forward_class,
1920 MemberName, BaseExpr))
1924 diag::err_ivar_access_using_property_syntax_suggest)
1925 << MemberName << QualType(OPT, 0) << Ivar->getDeclName()
1926 << FixItHint::CreateReplacement(OpLoc, "->");
1930 Diag(MemberLoc, diag::err_property_not_found)
1931 << MemberName << QualType(OPT, 0);
1933 Diag(Setter->getLocation(), diag::note_getter_unavailable)
1934 << MemberName << BaseExpr->getSourceRange();
1939 ActOnClassPropertyRefExpr(IdentifierInfo &receiverName,
1940 IdentifierInfo &propertyName,
1941 SourceLocation receiverNameLoc,
1942 SourceLocation propertyNameLoc) {
1944 IdentifierInfo *receiverNamePtr = &receiverName;
1945 ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr,
1950 // If the "receiver" is 'super' in a method, handle it as an expression-like
1951 // property reference.
1952 if (receiverNamePtr->isStr("super")) {
1953 if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf(receiverNameLoc)) {
1954 if (auto classDecl = CurMethod->getClassInterface()) {
1955 SuperType = QualType(classDecl->getSuperClassType(), 0);
1956 if (CurMethod->isInstanceMethod()) {
1957 if (SuperType.isNull()) {
1958 // The current class does not have a superclass.
1959 Diag(receiverNameLoc, diag::err_root_class_cannot_use_super)
1960 << CurMethod->getClassInterface()->getIdentifier();
1963 QualType T = Context.getObjCObjectPointerType(SuperType);
1965 return HandleExprPropertyRefExpr(T->castAs<ObjCObjectPointerType>(),
1966 /*BaseExpr*/nullptr,
1967 SourceLocation()/*OpLoc*/,
1970 receiverNameLoc, T, true);
1973 // Otherwise, if this is a class method, try dispatching to our
1975 IFace = CurMethod->getClassInterface()->getSuperClass();
1981 Diag(receiverNameLoc, diag::err_expected_either) << tok::identifier
1987 // Search for a declared property first.
1988 Selector Sel = PP.getSelectorTable().getNullarySelector(&propertyName);
1989 ObjCMethodDecl *Getter = IFace->lookupClassMethod(Sel);
1991 // If this reference is in an @implementation, check for 'private' methods.
1993 Getter = IFace->lookupPrivateClassMethod(Sel);
1996 // FIXME: refactor/share with ActOnMemberReference().
1997 // Check if we can reference this property.
1998 if (DiagnoseUseOfDecl(Getter, propertyNameLoc))
2002 // Look for the matching setter, in case it is needed.
2003 Selector SetterSel =
2004 SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
2005 PP.getSelectorTable(),
2008 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
2010 // If this reference is in an @implementation, also check for 'private'
2012 Setter = IFace->lookupPrivateClassMethod(SetterSel);
2014 // Look through local category implementations associated with the class.
2016 Setter = IFace->getCategoryClassMethod(SetterSel);
2018 if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc))
2021 if (Getter || Setter) {
2022 if (!SuperType.isNull())
2023 return new (Context)
2024 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
2025 OK_ObjCProperty, propertyNameLoc, receiverNameLoc,
2028 return new (Context) ObjCPropertyRefExpr(
2029 Getter, Setter, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty,
2030 propertyNameLoc, receiverNameLoc, IFace);
2032 return ExprError(Diag(propertyNameLoc, diag::err_property_not_found)
2033 << &propertyName << Context.getObjCInterfaceType(IFace));
2038 class ObjCInterfaceOrSuperCCC : public CorrectionCandidateCallback {
2040 ObjCInterfaceOrSuperCCC(ObjCMethodDecl *Method) {
2041 // Determine whether "super" is acceptable in the current context.
2042 if (Method && Method->getClassInterface())
2043 WantObjCSuper = Method->getClassInterface()->getSuperClass();
2046 bool ValidateCandidate(const TypoCorrection &candidate) override {
2047 return candidate.getCorrectionDeclAs<ObjCInterfaceDecl>() ||
2048 candidate.isKeyword("super");
2052 } // end anonymous namespace
2054 Sema::ObjCMessageKind Sema::getObjCMessageKind(Scope *S,
2055 IdentifierInfo *Name,
2056 SourceLocation NameLoc,
2058 bool HasTrailingDot,
2059 ParsedType &ReceiverType) {
2060 ReceiverType = nullptr;
2062 // If the identifier is "super" and there is no trailing dot, we're
2063 // messaging super. If the identifier is "super" and there is a
2064 // trailing dot, it's an instance message.
2065 if (IsSuper && S->isInObjcMethodScope())
2066 return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage;
2068 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
2069 LookupName(Result, S);
2071 switch (Result.getResultKind()) {
2072 case LookupResult::NotFound:
2073 // Normal name lookup didn't find anything. If we're in an
2074 // Objective-C method, look for ivars. If we find one, we're done!
2075 // FIXME: This is a hack. Ivar lookup should be part of normal
2077 if (ObjCMethodDecl *Method = getCurMethodDecl()) {
2078 if (!Method->getClassInterface()) {
2079 // Fall back: let the parser try to parse it as an instance message.
2080 return ObjCInstanceMessage;
2083 ObjCInterfaceDecl *ClassDeclared;
2084 if (Method->getClassInterface()->lookupInstanceVariable(Name,
2086 return ObjCInstanceMessage;
2089 // Break out; we'll perform typo correction below.
2092 case LookupResult::NotFoundInCurrentInstantiation:
2093 case LookupResult::FoundOverloaded:
2094 case LookupResult::FoundUnresolvedValue:
2095 case LookupResult::Ambiguous:
2096 Result.suppressDiagnostics();
2097 return ObjCInstanceMessage;
2099 case LookupResult::Found: {
2100 // If the identifier is a class or not, and there is a trailing dot,
2101 // it's an instance message.
2103 return ObjCInstanceMessage;
2104 // We found something. If it's a type, then we have a class
2105 // message. Otherwise, it's an instance message.
2106 NamedDecl *ND = Result.getFoundDecl();
2108 if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND))
2109 T = Context.getObjCInterfaceType(Class);
2110 else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND)) {
2111 T = Context.getTypeDeclType(Type);
2112 DiagnoseUseOfDecl(Type, NameLoc);
2115 return ObjCInstanceMessage;
2117 // We have a class message, and T is the type we're
2118 // messaging. Build source-location information for it.
2119 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2120 ReceiverType = CreateParsedType(T, TSInfo);
2121 return ObjCClassMessage;
2125 if (TypoCorrection Corrected = CorrectTypo(
2126 Result.getLookupNameInfo(), Result.getLookupKind(), S, nullptr,
2127 llvm::make_unique<ObjCInterfaceOrSuperCCC>(getCurMethodDecl()),
2128 CTK_ErrorRecovery, nullptr, false, nullptr, false)) {
2129 if (Corrected.isKeyword()) {
2130 // If we've found the keyword "super" (the only keyword that would be
2131 // returned by CorrectTypo), this is a send to super.
2132 diagnoseTypo(Corrected,
2133 PDiag(diag::err_unknown_receiver_suggest) << Name);
2134 return ObjCSuperMessage;
2135 } else if (ObjCInterfaceDecl *Class =
2136 Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>()) {
2137 // If we found a declaration, correct when it refers to an Objective-C
2139 diagnoseTypo(Corrected,
2140 PDiag(diag::err_unknown_receiver_suggest) << Name);
2141 QualType T = Context.getObjCInterfaceType(Class);
2142 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2143 ReceiverType = CreateParsedType(T, TSInfo);
2144 return ObjCClassMessage;
2148 // Fall back: let the parser try to parse it as an instance message.
2149 return ObjCInstanceMessage;
2152 ExprResult Sema::ActOnSuperMessage(Scope *S,
2153 SourceLocation SuperLoc,
2155 SourceLocation LBracLoc,
2156 ArrayRef<SourceLocation> SelectorLocs,
2157 SourceLocation RBracLoc,
2158 MultiExprArg Args) {
2159 // Determine whether we are inside a method or not.
2160 ObjCMethodDecl *Method = tryCaptureObjCSelf(SuperLoc);
2162 Diag(SuperLoc, diag::err_invalid_receiver_to_message_super);
2166 ObjCInterfaceDecl *Class = Method->getClassInterface();
2168 Diag(SuperLoc, diag::err_no_super_class_message)
2169 << Method->getDeclName();
2173 QualType SuperTy(Class->getSuperClassType(), 0);
2174 if (SuperTy.isNull()) {
2175 // The current class does not have a superclass.
2176 Diag(SuperLoc, diag::err_root_class_cannot_use_super)
2177 << Class->getIdentifier();
2181 // We are in a method whose class has a superclass, so 'super'
2182 // is acting as a keyword.
2183 if (Method->getSelector() == Sel)
2184 getCurFunction()->ObjCShouldCallSuper = false;
2186 if (Method->isInstanceMethod()) {
2187 // Since we are in an instance method, this is an instance
2188 // message to the superclass instance.
2189 SuperTy = Context.getObjCObjectPointerType(SuperTy);
2190 return BuildInstanceMessage(nullptr, SuperTy, SuperLoc,
2191 Sel, /*Method=*/nullptr,
2192 LBracLoc, SelectorLocs, RBracLoc, Args);
2195 // Since we are in a class method, this is a class message to
2197 return BuildClassMessage(/*ReceiverTypeInfo=*/nullptr,
2199 SuperLoc, Sel, /*Method=*/nullptr,
2200 LBracLoc, SelectorLocs, RBracLoc, Args);
2203 ExprResult Sema::BuildClassMessageImplicit(QualType ReceiverType,
2204 bool isSuperReceiver,
2207 ObjCMethodDecl *Method,
2208 MultiExprArg Args) {
2209 TypeSourceInfo *receiverTypeInfo = nullptr;
2210 if (!ReceiverType.isNull())
2211 receiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType);
2213 return BuildClassMessage(receiverTypeInfo, ReceiverType,
2214 /*SuperLoc=*/isSuperReceiver ? Loc : SourceLocation(),
2215 Sel, Method, Loc, Loc, Loc, Args,
2216 /*isImplicit=*/true);
2219 static void applyCocoaAPICheck(Sema &S, const ObjCMessageExpr *Msg,
2221 bool (*refactor)(const ObjCMessageExpr *,
2222 const NSAPI &, edit::Commit &)) {
2223 SourceLocation MsgLoc = Msg->getExprLoc();
2224 if (S.Diags.isIgnored(DiagID, MsgLoc))
2227 SourceManager &SM = S.SourceMgr;
2228 edit::Commit ECommit(SM, S.LangOpts);
2229 if (refactor(Msg,*S.NSAPIObj, ECommit)) {
2230 DiagnosticBuilder Builder = S.Diag(MsgLoc, DiagID)
2231 << Msg->getSelector() << Msg->getSourceRange();
2232 // FIXME: Don't emit diagnostic at all if fixits are non-commitable.
2233 if (!ECommit.isCommitable())
2235 for (edit::Commit::edit_iterator
2236 I = ECommit.edit_begin(), E = ECommit.edit_end(); I != E; ++I) {
2237 const edit::Commit::Edit &Edit = *I;
2238 switch (Edit.Kind) {
2239 case edit::Commit::Act_Insert:
2240 Builder.AddFixItHint(FixItHint::CreateInsertion(Edit.OrigLoc,
2244 case edit::Commit::Act_InsertFromRange:
2245 Builder.AddFixItHint(
2246 FixItHint::CreateInsertionFromRange(Edit.OrigLoc,
2247 Edit.getInsertFromRange(SM),
2250 case edit::Commit::Act_Remove:
2251 Builder.AddFixItHint(FixItHint::CreateRemoval(Edit.getFileRange(SM)));
2258 static void checkCocoaAPI(Sema &S, const ObjCMessageExpr *Msg) {
2259 applyCocoaAPICheck(S, Msg, diag::warn_objc_redundant_literal_use,
2260 edit::rewriteObjCRedundantCallWithLiteral);
2263 /// \brief Diagnose use of %s directive in an NSString which is being passed
2264 /// as formatting string to formatting method.
2266 DiagnoseCStringFormatDirectiveInObjCAPI(Sema &S,
2267 ObjCMethodDecl *Method,
2269 Expr **Args, unsigned NumArgs) {
2271 bool Format = false;
2272 ObjCStringFormatFamily SFFamily = Sel.getStringFormatFamily();
2273 if (SFFamily == ObjCStringFormatFamily::SFF_NSString) {
2278 for (const auto *I : Method->specific_attrs<FormatAttr>()) {
2279 if (S.GetFormatNSStringIdx(I, Idx)) {
2285 if (!Format || NumArgs <= Idx)
2288 Expr *FormatExpr = Args[Idx];
2289 if (ObjCStringLiteral *OSL =
2290 dyn_cast<ObjCStringLiteral>(FormatExpr->IgnoreParenImpCasts())) {
2291 StringLiteral *FormatString = OSL->getString();
2292 if (S.FormatStringHasSArg(FormatString)) {
2293 S.Diag(FormatExpr->getExprLoc(), diag::warn_objc_cdirective_format_string)
2296 S.Diag(Method->getLocation(), diag::note_method_declared_at)
2297 << Method->getDeclName();
2302 /// \brief Build an Objective-C class message expression.
2304 /// This routine takes care of both normal class messages and
2305 /// class messages to the superclass.
2307 /// \param ReceiverTypeInfo Type source information that describes the
2308 /// receiver of this message. This may be NULL, in which case we are
2309 /// sending to the superclass and \p SuperLoc must be a valid source
2312 /// \param ReceiverType The type of the object receiving the
2313 /// message. When \p ReceiverTypeInfo is non-NULL, this is the same
2314 /// type as that refers to. For a superclass send, this is the type of
2317 /// \param SuperLoc The location of the "super" keyword in a
2318 /// superclass message.
2320 /// \param Sel The selector to which the message is being sent.
2322 /// \param Method The method that this class message is invoking, if
2325 /// \param LBracLoc The location of the opening square bracket ']'.
2327 /// \param RBracLoc The location of the closing square bracket ']'.
2329 /// \param ArgsIn The message arguments.
2330 ExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo,
2331 QualType ReceiverType,
2332 SourceLocation SuperLoc,
2334 ObjCMethodDecl *Method,
2335 SourceLocation LBracLoc,
2336 ArrayRef<SourceLocation> SelectorLocs,
2337 SourceLocation RBracLoc,
2338 MultiExprArg ArgsIn,
2340 SourceLocation Loc = SuperLoc.isValid()? SuperLoc
2341 : ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin();
2342 if (LBracLoc.isInvalid()) {
2343 Diag(Loc, diag::err_missing_open_square_message_send)
2344 << FixItHint::CreateInsertion(Loc, "[");
2347 SourceLocation SelLoc;
2348 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2349 SelLoc = SelectorLocs.front();
2353 if (ReceiverType->isDependentType()) {
2354 // If the receiver type is dependent, we can't type-check anything
2355 // at this point. Build a dependent expression.
2356 unsigned NumArgs = ArgsIn.size();
2357 Expr **Args = ArgsIn.data();
2358 assert(SuperLoc.isInvalid() && "Message to super with dependent type");
2359 return ObjCMessageExpr::Create(
2360 Context, ReceiverType, VK_RValue, LBracLoc, ReceiverTypeInfo, Sel,
2361 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs), RBracLoc,
2365 // Find the class to which we are sending this message.
2366 ObjCInterfaceDecl *Class = nullptr;
2367 const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>();
2368 if (!ClassType || !(Class = ClassType->getInterface())) {
2369 Diag(Loc, diag::err_invalid_receiver_class_message)
2373 assert(Class && "We don't know which class we're messaging?");
2374 // objc++ diagnoses during typename annotation.
2375 if (!getLangOpts().CPlusPlus)
2376 (void)DiagnoseUseOfDecl(Class, SelLoc);
2377 // Find the method we are messaging.
2379 SourceRange TypeRange
2380 = SuperLoc.isValid()? SourceRange(SuperLoc)
2381 : ReceiverTypeInfo->getTypeLoc().getSourceRange();
2382 if (RequireCompleteType(Loc, Context.getObjCInterfaceType(Class),
2383 (getLangOpts().ObjCAutoRefCount
2384 ? diag::err_arc_receiver_forward_class
2385 : diag::warn_receiver_forward_class),
2387 // A forward class used in messaging is treated as a 'Class'
2388 Method = LookupFactoryMethodInGlobalPool(Sel,
2389 SourceRange(LBracLoc, RBracLoc));
2390 if (Method && !getLangOpts().ObjCAutoRefCount)
2391 Diag(Method->getLocation(), diag::note_method_sent_forward_class)
2392 << Method->getDeclName();
2395 Method = Class->lookupClassMethod(Sel);
2397 // If we have an implementation in scope, check "private" methods.
2399 Method = Class->lookupPrivateClassMethod(Sel);
2401 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2405 // Check the argument types and determine the result type.
2406 QualType ReturnType;
2407 ExprValueKind VK = VK_RValue;
2409 unsigned NumArgs = ArgsIn.size();
2410 Expr **Args = ArgsIn.data();
2411 if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2414 SuperLoc.isValid(), LBracLoc, RBracLoc,
2419 if (Method && !Method->getReturnType()->isVoidType() &&
2420 RequireCompleteType(LBracLoc, Method->getReturnType(),
2421 diag::err_illegal_message_expr_incomplete_type))
2424 // Warn about explicit call of +initialize on its own class. But not on 'super'.
2425 if (Method && Method->getMethodFamily() == OMF_initialize) {
2426 if (!SuperLoc.isValid()) {
2427 const ObjCInterfaceDecl *ID =
2428 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext());
2430 Diag(Loc, diag::warn_direct_initialize_call);
2431 Diag(Method->getLocation(), diag::note_method_declared_at)
2432 << Method->getDeclName();
2435 else if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2436 // [super initialize] is allowed only within an +initialize implementation
2437 if (CurMeth->getMethodFamily() != OMF_initialize) {
2438 Diag(Loc, diag::warn_direct_super_initialize_call);
2439 Diag(Method->getLocation(), diag::note_method_declared_at)
2440 << Method->getDeclName();
2441 Diag(CurMeth->getLocation(), diag::note_method_declared_at)
2442 << CurMeth->getDeclName();
2447 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
2449 // Construct the appropriate ObjCMessageExpr.
2450 ObjCMessageExpr *Result;
2451 if (SuperLoc.isValid())
2452 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2453 SuperLoc, /*IsInstanceSuper=*/false,
2454 ReceiverType, Sel, SelectorLocs,
2455 Method, makeArrayRef(Args, NumArgs),
2456 RBracLoc, isImplicit);
2458 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2459 ReceiverTypeInfo, Sel, SelectorLocs,
2460 Method, makeArrayRef(Args, NumArgs),
2461 RBracLoc, isImplicit);
2463 checkCocoaAPI(*this, Result);
2465 return MaybeBindToTemporary(Result);
2468 // ActOnClassMessage - used for both unary and keyword messages.
2469 // ArgExprs is optional - if it is present, the number of expressions
2470 // is obtained from Sel.getNumArgs().
2471 ExprResult Sema::ActOnClassMessage(Scope *S,
2472 ParsedType Receiver,
2474 SourceLocation LBracLoc,
2475 ArrayRef<SourceLocation> SelectorLocs,
2476 SourceLocation RBracLoc,
2477 MultiExprArg Args) {
2478 TypeSourceInfo *ReceiverTypeInfo;
2479 QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo);
2480 if (ReceiverType.isNull())
2483 if (!ReceiverTypeInfo)
2484 ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc);
2486 return BuildClassMessage(ReceiverTypeInfo, ReceiverType,
2487 /*SuperLoc=*/SourceLocation(), Sel,
2488 /*Method=*/nullptr, LBracLoc, SelectorLocs, RBracLoc,
2492 ExprResult Sema::BuildInstanceMessageImplicit(Expr *Receiver,
2493 QualType ReceiverType,
2496 ObjCMethodDecl *Method,
2497 MultiExprArg Args) {
2498 return BuildInstanceMessage(Receiver, ReceiverType,
2499 /*SuperLoc=*/!Receiver ? Loc : SourceLocation(),
2500 Sel, Method, Loc, Loc, Loc, Args,
2501 /*isImplicit=*/true);
2504 /// \brief Build an Objective-C instance message expression.
2506 /// This routine takes care of both normal instance messages and
2507 /// instance messages to the superclass instance.
2509 /// \param Receiver The expression that computes the object that will
2510 /// receive this message. This may be empty, in which case we are
2511 /// sending to the superclass instance and \p SuperLoc must be a valid
2512 /// source location.
2514 /// \param ReceiverType The (static) type of the object receiving the
2515 /// message. When a \p Receiver expression is provided, this is the
2516 /// same type as that expression. For a superclass instance send, this
2517 /// is a pointer to the type of the superclass.
2519 /// \param SuperLoc The location of the "super" keyword in a
2520 /// superclass instance message.
2522 /// \param Sel The selector to which the message is being sent.
2524 /// \param Method The method that this instance message is invoking, if
2527 /// \param LBracLoc The location of the opening square bracket ']'.
2529 /// \param RBracLoc The location of the closing square bracket ']'.
2531 /// \param ArgsIn The message arguments.
2532 ExprResult Sema::BuildInstanceMessage(Expr *Receiver,
2533 QualType ReceiverType,
2534 SourceLocation SuperLoc,
2536 ObjCMethodDecl *Method,
2537 SourceLocation LBracLoc,
2538 ArrayRef<SourceLocation> SelectorLocs,
2539 SourceLocation RBracLoc,
2540 MultiExprArg ArgsIn,
2542 assert((Receiver || SuperLoc.isValid()) && "If the Receiver is null, the "
2543 "SuperLoc must be valid so we can "
2546 // The location of the receiver.
2547 SourceLocation Loc = SuperLoc.isValid()? SuperLoc : Receiver->getLocStart();
2548 SourceRange RecRange =
2549 SuperLoc.isValid()? SuperLoc : Receiver->getSourceRange();
2550 SourceLocation SelLoc;
2551 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2552 SelLoc = SelectorLocs.front();
2556 if (LBracLoc.isInvalid()) {
2557 Diag(Loc, diag::err_missing_open_square_message_send)
2558 << FixItHint::CreateInsertion(Loc, "[");
2562 // If we have a receiver expression, perform appropriate promotions
2563 // and determine receiver type.
2565 if (Receiver->hasPlaceholderType()) {
2567 if (Receiver->getType() == Context.UnknownAnyTy)
2568 Result = forceUnknownAnyToType(Receiver, Context.getObjCIdType());
2570 Result = CheckPlaceholderExpr(Receiver);
2571 if (Result.isInvalid()) return ExprError();
2572 Receiver = Result.get();
2575 if (Receiver->isTypeDependent()) {
2576 // If the receiver is type-dependent, we can't type-check anything
2577 // at this point. Build a dependent expression.
2578 unsigned NumArgs = ArgsIn.size();
2579 Expr **Args = ArgsIn.data();
2580 assert(SuperLoc.isInvalid() && "Message to super with dependent type");
2581 return ObjCMessageExpr::Create(
2582 Context, Context.DependentTy, VK_RValue, LBracLoc, Receiver, Sel,
2583 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs),
2584 RBracLoc, isImplicit);
2587 // If necessary, apply function/array conversion to the receiver.
2588 // C99 6.7.5.3p[7,8].
2589 ExprResult Result = DefaultFunctionArrayLvalueConversion(Receiver);
2590 if (Result.isInvalid())
2592 Receiver = Result.get();
2593 ReceiverType = Receiver->getType();
2595 // If the receiver is an ObjC pointer, a block pointer, or an
2596 // __attribute__((NSObject)) pointer, we don't need to do any
2597 // special conversion in order to look up a receiver.
2598 if (ReceiverType->isObjCRetainableType()) {
2600 } else if (!getLangOpts().ObjCAutoRefCount &&
2601 !Context.getObjCIdType().isNull() &&
2602 (ReceiverType->isPointerType() ||
2603 ReceiverType->isIntegerType())) {
2604 // Implicitly convert integers and pointers to 'id' but emit a warning.
2606 Diag(Loc, diag::warn_bad_receiver_type)
2608 << Receiver->getSourceRange();
2609 if (ReceiverType->isPointerType()) {
2610 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2611 CK_CPointerToObjCPointerCast).get();
2613 // TODO: specialized warning on null receivers?
2614 bool IsNull = Receiver->isNullPointerConstant(Context,
2615 Expr::NPC_ValueDependentIsNull);
2616 CastKind Kind = IsNull ? CK_NullToPointer : CK_IntegralToPointer;
2617 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2620 ReceiverType = Receiver->getType();
2621 } else if (getLangOpts().CPlusPlus) {
2622 // The receiver must be a complete type.
2623 if (RequireCompleteType(Loc, Receiver->getType(),
2624 diag::err_incomplete_receiver_type))
2627 ExprResult result = PerformContextuallyConvertToObjCPointer(Receiver);
2628 if (result.isUsable()) {
2629 Receiver = result.get();
2630 ReceiverType = Receiver->getType();
2635 // There's a somewhat weird interaction here where we assume that we
2636 // won't actually have a method unless we also don't need to do some
2637 // of the more detailed type-checking on the receiver.
2640 // Handle messages to id and __kindof types (where we use the
2641 // global method pool).
2642 const ObjCObjectType *typeBound = nullptr;
2643 bool receiverIsIdLike = ReceiverType->isObjCIdOrObjectKindOfType(Context,
2645 if (receiverIsIdLike || ReceiverType->isBlockPointerType() ||
2646 (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) {
2647 SmallVector<ObjCMethodDecl*, 4> Methods;
2648 // If we have a type bound, further filter the methods.
2649 CollectMultipleMethodsInGlobalPool(Sel, Methods, true/*InstanceFirst*/,
2650 true/*CheckTheOther*/, typeBound);
2651 if (!Methods.empty()) {
2652 // We choose the first method as the initial candidate, then try to
2653 // select a better one.
2654 Method = Methods[0];
2656 if (ObjCMethodDecl *BestMethod =
2657 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(), Methods))
2658 Method = BestMethod;
2660 if (!AreMultipleMethodsInGlobalPool(Sel, Method,
2661 SourceRange(LBracLoc, RBracLoc),
2662 receiverIsIdLike, Methods))
2663 DiagnoseUseOfDecl(Method, SelLoc);
2665 } else if (ReceiverType->isObjCClassOrClassKindOfType() ||
2666 ReceiverType->isObjCQualifiedClassType()) {
2667 // Handle messages to Class.
2668 // We allow sending a message to a qualified Class ("Class<foo>"), which
2669 // is ok as long as one of the protocols implements the selector (if not,
2671 if (!ReceiverType->isObjCClassOrClassKindOfType()) {
2672 const ObjCObjectPointerType *QClassTy
2673 = ReceiverType->getAsObjCQualifiedClassType();
2674 // Search protocols for class methods.
2675 Method = LookupMethodInQualifiedType(Sel, QClassTy, false);
2677 Method = LookupMethodInQualifiedType(Sel, QClassTy, true);
2678 // warn if instance method found for a Class message.
2680 Diag(SelLoc, diag::warn_instance_method_on_class_found)
2681 << Method->getSelector() << Sel;
2682 Diag(Method->getLocation(), diag::note_method_declared_at)
2683 << Method->getDeclName();
2687 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2688 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) {
2689 // First check the public methods in the class interface.
2690 Method = ClassDecl->lookupClassMethod(Sel);
2693 Method = ClassDecl->lookupPrivateClassMethod(Sel);
2695 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2699 // If not messaging 'self', look for any factory method named 'Sel'.
2700 if (!Receiver || !isSelfExpr(Receiver)) {
2701 // If no class (factory) method was found, check if an _instance_
2702 // method of the same name exists in the root class only.
2703 SmallVector<ObjCMethodDecl*, 4> Methods;
2704 CollectMultipleMethodsInGlobalPool(Sel, Methods,
2705 false/*InstanceFirst*/,
2706 true/*CheckTheOther*/);
2707 if (!Methods.empty()) {
2708 // We choose the first method as the initial candidate, then try
2709 // to select a better one.
2710 Method = Methods[0];
2712 // If we find an instance method, emit waring.
2713 if (Method->isInstanceMethod()) {
2714 if (const ObjCInterfaceDecl *ID =
2715 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) {
2716 if (ID->getSuperClass())
2717 Diag(SelLoc, diag::warn_root_inst_method_not_found)
2718 << Sel << SourceRange(LBracLoc, RBracLoc);
2722 if (ObjCMethodDecl *BestMethod =
2723 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2725 Method = BestMethod;
2731 ObjCInterfaceDecl *ClassDecl = nullptr;
2733 // We allow sending a message to a qualified ID ("id<foo>"), which is ok as
2734 // long as one of the protocols implements the selector (if not, warn).
2735 // And as long as message is not deprecated/unavailable (warn if it is).
2736 if (const ObjCObjectPointerType *QIdTy
2737 = ReceiverType->getAsObjCQualifiedIdType()) {
2738 // Search protocols for instance methods.
2739 Method = LookupMethodInQualifiedType(Sel, QIdTy, true);
2741 Method = LookupMethodInQualifiedType(Sel, QIdTy, false);
2742 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2744 } else if (const ObjCObjectPointerType *OCIType
2745 = ReceiverType->getAsObjCInterfacePointerType()) {
2746 // We allow sending a message to a pointer to an interface (an object).
2747 ClassDecl = OCIType->getInterfaceDecl();
2749 // Try to complete the type. Under ARC, this is a hard error from which
2750 // we don't try to recover.
2751 // FIXME: In the non-ARC case, this will still be a hard error if the
2752 // definition is found in a module that's not visible.
2753 const ObjCInterfaceDecl *forwardClass = nullptr;
2754 if (RequireCompleteType(Loc, OCIType->getPointeeType(),
2755 getLangOpts().ObjCAutoRefCount
2756 ? diag::err_arc_receiver_forward_instance
2757 : diag::warn_receiver_forward_instance,
2758 Receiver? Receiver->getSourceRange()
2759 : SourceRange(SuperLoc))) {
2760 if (getLangOpts().ObjCAutoRefCount)
2763 forwardClass = OCIType->getInterfaceDecl();
2764 Diag(Receiver ? Receiver->getLocStart()
2765 : SuperLoc, diag::note_receiver_is_id);
2768 Method = ClassDecl->lookupInstanceMethod(Sel);
2772 // Search protocol qualifiers.
2773 Method = LookupMethodInQualifiedType(Sel, OCIType, true);
2776 // If we have implementations in scope, check "private" methods.
2777 Method = ClassDecl->lookupPrivateMethod(Sel);
2779 if (!Method && getLangOpts().ObjCAutoRefCount) {
2780 Diag(SelLoc, diag::err_arc_may_not_respond)
2781 << OCIType->getPointeeType() << Sel << RecRange
2782 << SourceRange(SelectorLocs.front(), SelectorLocs.back());
2786 if (!Method && (!Receiver || !isSelfExpr(Receiver))) {
2787 // If we still haven't found a method, look in the global pool. This
2788 // behavior isn't very desirable, however we need it for GCC
2789 // compatibility. FIXME: should we deviate??
2790 if (OCIType->qual_empty()) {
2791 SmallVector<ObjCMethodDecl*, 4> Methods;
2792 CollectMultipleMethodsInGlobalPool(Sel, Methods,
2793 true/*InstanceFirst*/,
2794 false/*CheckTheOther*/);
2795 if (!Methods.empty()) {
2796 // We choose the first method as the initial candidate, then try
2797 // to select a better one.
2798 Method = Methods[0];
2800 if (ObjCMethodDecl *BestMethod =
2801 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2803 Method = BestMethod;
2805 AreMultipleMethodsInGlobalPool(Sel, Method,
2806 SourceRange(LBracLoc, RBracLoc),
2807 true/*receiverIdOrClass*/,
2810 if (Method && !forwardClass)
2811 Diag(SelLoc, diag::warn_maynot_respond)
2812 << OCIType->getInterfaceDecl()->getIdentifier()
2817 if (Method && DiagnoseUseOfDecl(Method, SelLoc, forwardClass))
2820 // Reject other random receiver types (e.g. structs).
2821 Diag(Loc, diag::err_bad_receiver_type)
2822 << ReceiverType << Receiver->getSourceRange();
2828 FunctionScopeInfo *DIFunctionScopeInfo =
2829 (Method && Method->getMethodFamily() == OMF_init)
2830 ? getEnclosingFunction() : nullptr;
2832 if (DIFunctionScopeInfo &&
2833 DIFunctionScopeInfo->ObjCIsDesignatedInit &&
2834 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2835 bool isDesignatedInitChain = false;
2836 if (SuperLoc.isValid()) {
2837 if (const ObjCObjectPointerType *
2838 OCIType = ReceiverType->getAsObjCInterfacePointerType()) {
2839 if (const ObjCInterfaceDecl *ID = OCIType->getInterfaceDecl()) {
2840 // Either we know this is a designated initializer or we
2841 // conservatively assume it because we don't know for sure.
2842 if (!ID->declaresOrInheritsDesignatedInitializers() ||
2843 ID->isDesignatedInitializer(Sel)) {
2844 isDesignatedInitChain = true;
2845 DIFunctionScopeInfo->ObjCWarnForNoDesignatedInitChain = false;
2850 if (!isDesignatedInitChain) {
2851 const ObjCMethodDecl *InitMethod = nullptr;
2853 getCurMethodDecl()->isDesignatedInitializerForTheInterface(&InitMethod);
2854 assert(isDesignated && InitMethod);
2856 Diag(SelLoc, SuperLoc.isValid() ?
2857 diag::warn_objc_designated_init_non_designated_init_call :
2858 diag::warn_objc_designated_init_non_super_designated_init_call);
2859 Diag(InitMethod->getLocation(),
2860 diag::note_objc_designated_init_marked_here);
2864 if (DIFunctionScopeInfo &&
2865 DIFunctionScopeInfo->ObjCIsSecondaryInit &&
2866 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2867 if (SuperLoc.isValid()) {
2868 Diag(SelLoc, diag::warn_objc_secondary_init_super_init_call);
2870 DIFunctionScopeInfo->ObjCWarnForNoInitDelegation = false;
2874 // Check the message arguments.
2875 unsigned NumArgs = ArgsIn.size();
2876 Expr **Args = ArgsIn.data();
2877 QualType ReturnType;
2878 ExprValueKind VK = VK_RValue;
2879 bool ClassMessage = (ReceiverType->isObjCClassType() ||
2880 ReceiverType->isObjCQualifiedClassType());
2881 if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2882 Sel, SelectorLocs, Method,
2883 ClassMessage, SuperLoc.isValid(),
2884 LBracLoc, RBracLoc, RecRange, ReturnType, VK))
2887 if (Method && !Method->getReturnType()->isVoidType() &&
2888 RequireCompleteType(LBracLoc, Method->getReturnType(),
2889 diag::err_illegal_message_expr_incomplete_type))
2892 // In ARC, forbid the user from sending messages to
2893 // retain/release/autorelease/dealloc/retainCount explicitly.
2894 if (getLangOpts().ObjCAutoRefCount) {
2895 ObjCMethodFamily family =
2896 (Method ? Method->getMethodFamily() : Sel.getMethodFamily());
2900 checkInitMethod(Method, ReceiverType);
2906 case OMF_mutableCopy:
2909 case OMF_initialize:
2915 case OMF_autorelease:
2916 case OMF_retainCount:
2917 Diag(SelLoc, diag::err_arc_illegal_explicit_message)
2921 case OMF_performSelector:
2922 if (Method && NumArgs >= 1) {
2923 if (ObjCSelectorExpr *SelExp = dyn_cast<ObjCSelectorExpr>(Args[0])) {
2924 Selector ArgSel = SelExp->getSelector();
2925 ObjCMethodDecl *SelMethod =
2926 LookupInstanceMethodInGlobalPool(ArgSel,
2927 SelExp->getSourceRange());
2930 LookupFactoryMethodInGlobalPool(ArgSel,
2931 SelExp->getSourceRange());
2933 ObjCMethodFamily SelFamily = SelMethod->getMethodFamily();
2934 switch (SelFamily) {
2937 case OMF_mutableCopy:
2941 // Issue error, unless ns_returns_not_retained.
2942 if (!SelMethod->hasAttr<NSReturnsNotRetainedAttr>()) {
2943 // selector names a +1 method
2945 diag::err_arc_perform_selector_retains);
2946 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
2947 << SelMethod->getDeclName();
2951 // +0 call. OK. unless ns_returns_retained.
2952 if (SelMethod->hasAttr<NSReturnsRetainedAttr>()) {
2953 // selector names a +1 method
2955 diag::err_arc_perform_selector_retains);
2956 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
2957 << SelMethod->getDeclName();
2963 // error (may leak).
2964 Diag(SelLoc, diag::warn_arc_perform_selector_leaks);
2965 Diag(Args[0]->getExprLoc(), diag::note_used_here);
2972 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
2974 // Construct the appropriate ObjCMessageExpr instance.
2975 ObjCMessageExpr *Result;
2976 if (SuperLoc.isValid())
2977 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2978 SuperLoc, /*IsInstanceSuper=*/true,
2979 ReceiverType, Sel, SelectorLocs, Method,
2980 makeArrayRef(Args, NumArgs), RBracLoc,
2983 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2984 Receiver, Sel, SelectorLocs, Method,
2985 makeArrayRef(Args, NumArgs), RBracLoc,
2988 checkCocoaAPI(*this, Result);
2991 if (getLangOpts().ObjCAutoRefCount) {
2992 // In ARC, annotate delegate init calls.
2993 if (Result->getMethodFamily() == OMF_init &&
2994 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2995 // Only consider init calls *directly* in init implementations,
2996 // not within blocks.
2997 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(CurContext);
2998 if (method && method->getMethodFamily() == OMF_init) {
2999 // The implicit assignment to self means we also don't want to
3000 // consume the result.
3001 Result->setDelegateInitCall(true);
3006 // In ARC, check for message sends which are likely to introduce
3008 checkRetainCycles(Result);
3010 if (!isImplicit && Method) {
3011 if (const ObjCPropertyDecl *Prop = Method->findPropertyDecl()) {
3013 Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak;
3014 if (!IsWeak && Sel.isUnarySelector())
3015 IsWeak = ReturnType.getObjCLifetime() & Qualifiers::OCL_Weak;
3017 !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, LBracLoc))
3018 getCurFunction()->recordUseOfWeak(Result, Prop);
3023 CheckObjCCircularContainer(Result);
3025 return MaybeBindToTemporary(Result);
3028 static void RemoveSelectorFromWarningCache(Sema &S, Expr* Arg) {
3029 if (ObjCSelectorExpr *OSE =
3030 dyn_cast<ObjCSelectorExpr>(Arg->IgnoreParenCasts())) {
3031 Selector Sel = OSE->getSelector();
3032 SourceLocation Loc = OSE->getAtLoc();
3033 auto Pos = S.ReferencedSelectors.find(Sel);
3034 if (Pos != S.ReferencedSelectors.end() && Pos->second == Loc)
3035 S.ReferencedSelectors.erase(Pos);
3039 // ActOnInstanceMessage - used for both unary and keyword messages.
3040 // ArgExprs is optional - if it is present, the number of expressions
3041 // is obtained from Sel.getNumArgs().
3042 ExprResult Sema::ActOnInstanceMessage(Scope *S,
3045 SourceLocation LBracLoc,
3046 ArrayRef<SourceLocation> SelectorLocs,
3047 SourceLocation RBracLoc,
3048 MultiExprArg Args) {
3052 // A ParenListExpr can show up while doing error recovery with invalid code.
3053 if (isa<ParenListExpr>(Receiver)) {
3054 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Receiver);
3055 if (Result.isInvalid()) return ExprError();
3056 Receiver = Result.get();
3059 if (RespondsToSelectorSel.isNull()) {
3060 IdentifierInfo *SelectorId = &Context.Idents.get("respondsToSelector");
3061 RespondsToSelectorSel = Context.Selectors.getUnarySelector(SelectorId);
3063 if (Sel == RespondsToSelectorSel)
3064 RemoveSelectorFromWarningCache(*this, Args[0]);
3066 return BuildInstanceMessage(Receiver, Receiver->getType(),
3067 /*SuperLoc=*/SourceLocation(), Sel,
3068 /*Method=*/nullptr, LBracLoc, SelectorLocs,
3072 enum ARCConversionTypeClass {
3073 /// int, void, struct A
3079 /// id*, id***, void (^*)(),
3080 ACTC_indirectRetainable,
3082 /// void* might be a normal C type, or it might a CF type.
3089 static bool isAnyRetainable(ARCConversionTypeClass ACTC) {
3090 return (ACTC == ACTC_retainable ||
3091 ACTC == ACTC_coreFoundation ||
3092 ACTC == ACTC_voidPtr);
3095 static bool isAnyCLike(ARCConversionTypeClass ACTC) {
3096 return ACTC == ACTC_none ||
3097 ACTC == ACTC_voidPtr ||
3098 ACTC == ACTC_coreFoundation;
3101 static ARCConversionTypeClass classifyTypeForARCConversion(QualType type) {
3102 bool isIndirect = false;
3104 // Ignore an outermost reference type.
3105 if (const ReferenceType *ref = type->getAs<ReferenceType>()) {
3106 type = ref->getPointeeType();
3110 // Drill through pointers and arrays recursively.
3112 if (const PointerType *ptr = type->getAs<PointerType>()) {
3113 type = ptr->getPointeeType();
3115 // The first level of pointer may be the innermost pointer on a CF type.
3117 if (type->isVoidType()) return ACTC_voidPtr;
3118 if (type->isRecordType()) return ACTC_coreFoundation;
3120 } else if (const ArrayType *array = type->getAsArrayTypeUnsafe()) {
3121 type = QualType(array->getElementType()->getBaseElementTypeUnsafe(), 0);
3129 if (type->isObjCARCBridgableType())
3130 return ACTC_indirectRetainable;
3134 if (type->isObjCARCBridgableType())
3135 return ACTC_retainable;
3141 /// A result from the cast checker.
3143 /// Cannot be casted.
3146 /// Can be safely retained or not retained.
3149 /// Can be casted at +0.
3152 /// Can be casted at +1.
3155 ACCResult merge(ACCResult left, ACCResult right) {
3156 if (left == right) return left;
3157 if (left == ACC_bottom) return right;
3158 if (right == ACC_bottom) return left;
3162 /// A checker which white-lists certain expressions whose conversion
3163 /// to or from retainable type would otherwise be forbidden in ARC.
3164 class ARCCastChecker : public StmtVisitor<ARCCastChecker, ACCResult> {
3165 typedef StmtVisitor<ARCCastChecker, ACCResult> super;
3167 ASTContext &Context;
3168 ARCConversionTypeClass SourceClass;
3169 ARCConversionTypeClass TargetClass;
3172 static bool isCFType(QualType type) {
3173 // Someday this can use ns_bridged. For now, it has to do this.
3174 return type->isCARCBridgableType();
3178 ARCCastChecker(ASTContext &Context, ARCConversionTypeClass source,
3179 ARCConversionTypeClass target, bool diagnose)
3180 : Context(Context), SourceClass(source), TargetClass(target),
3181 Diagnose(diagnose) {}
3184 ACCResult Visit(Expr *e) {
3185 return super::Visit(e->IgnoreParens());
3188 ACCResult VisitStmt(Stmt *s) {
3192 /// Null pointer constants can be casted however you please.
3193 ACCResult VisitExpr(Expr *e) {
3194 if (e->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull))
3199 /// Objective-C string literals can be safely casted.
3200 ACCResult VisitObjCStringLiteral(ObjCStringLiteral *e) {
3201 // If we're casting to any retainable type, go ahead. Global
3202 // strings are immune to retains, so this is bottom.
3203 if (isAnyRetainable(TargetClass)) return ACC_bottom;
3208 /// Look through certain implicit and explicit casts.
3209 ACCResult VisitCastExpr(CastExpr *e) {
3210 switch (e->getCastKind()) {
3211 case CK_NullToPointer:
3215 case CK_LValueToRValue:
3217 case CK_CPointerToObjCPointerCast:
3218 case CK_BlockPointerToObjCPointerCast:
3219 case CK_AnyPointerToBlockPointerCast:
3220 return Visit(e->getSubExpr());
3227 /// Look through unary extension.
3228 ACCResult VisitUnaryExtension(UnaryOperator *e) {
3229 return Visit(e->getSubExpr());
3232 /// Ignore the LHS of a comma operator.
3233 ACCResult VisitBinComma(BinaryOperator *e) {
3234 return Visit(e->getRHS());
3237 /// Conditional operators are okay if both sides are okay.
3238 ACCResult VisitConditionalOperator(ConditionalOperator *e) {
3239 ACCResult left = Visit(e->getTrueExpr());
3240 if (left == ACC_invalid) return ACC_invalid;
3241 return merge(left, Visit(e->getFalseExpr()));
3244 /// Look through pseudo-objects.
3245 ACCResult VisitPseudoObjectExpr(PseudoObjectExpr *e) {
3246 // If we're getting here, we should always have a result.
3247 return Visit(e->getResultExpr());
3250 /// Statement expressions are okay if their result expression is okay.
3251 ACCResult VisitStmtExpr(StmtExpr *e) {
3252 return Visit(e->getSubStmt()->body_back());
3255 /// Some declaration references are okay.
3256 ACCResult VisitDeclRefExpr(DeclRefExpr *e) {
3257 VarDecl *var = dyn_cast<VarDecl>(e->getDecl());
3258 // References to global constants are okay.
3259 if (isAnyRetainable(TargetClass) &&
3260 isAnyRetainable(SourceClass) &&
3262 var->getStorageClass() == SC_Extern &&
3263 var->getType().isConstQualified()) {
3265 // In system headers, they can also be assumed to be immune to retains.
3266 // These are things like 'kCFStringTransformToLatin'.
3267 if (Context.getSourceManager().isInSystemHeader(var->getLocation()))
3270 return ACC_plusZero;
3277 /// Some calls are okay.
3278 ACCResult VisitCallExpr(CallExpr *e) {
3279 if (FunctionDecl *fn = e->getDirectCallee())
3280 if (ACCResult result = checkCallToFunction(fn))
3283 return super::VisitCallExpr(e);
3286 ACCResult checkCallToFunction(FunctionDecl *fn) {
3287 // Require a CF*Ref return type.
3288 if (!isCFType(fn->getReturnType()))
3291 if (!isAnyRetainable(TargetClass))
3294 // Honor an explicit 'not retained' attribute.
3295 if (fn->hasAttr<CFReturnsNotRetainedAttr>())
3296 return ACC_plusZero;
3298 // Honor an explicit 'retained' attribute, except that for
3299 // now we're not going to permit implicit handling of +1 results,
3300 // because it's a bit frightening.
3301 if (fn->hasAttr<CFReturnsRetainedAttr>())
3302 return Diagnose ? ACC_plusOne
3303 : ACC_invalid; // ACC_plusOne if we start accepting this
3305 // Recognize this specific builtin function, which is used by CFSTR.
3306 unsigned builtinID = fn->getBuiltinID();
3307 if (builtinID == Builtin::BI__builtin___CFStringMakeConstantString)
3310 // Otherwise, don't do anything implicit with an unaudited function.
3311 if (!fn->hasAttr<CFAuditedTransferAttr>())
3314 // Otherwise, it's +0 unless it follows the create convention.
3315 if (ento::coreFoundation::followsCreateRule(fn))
3316 return Diagnose ? ACC_plusOne
3317 : ACC_invalid; // ACC_plusOne if we start accepting this
3319 return ACC_plusZero;
3322 ACCResult VisitObjCMessageExpr(ObjCMessageExpr *e) {
3323 return checkCallToMethod(e->getMethodDecl());
3326 ACCResult VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *e) {
3327 ObjCMethodDecl *method;
3328 if (e->isExplicitProperty())
3329 method = e->getExplicitProperty()->getGetterMethodDecl();
3331 method = e->getImplicitPropertyGetter();
3332 return checkCallToMethod(method);
3335 ACCResult checkCallToMethod(ObjCMethodDecl *method) {
3336 if (!method) return ACC_invalid;
3338 // Check for message sends to functions returning CF types. We
3339 // just obey the Cocoa conventions with these, even though the
3340 // return type is CF.
3341 if (!isAnyRetainable(TargetClass) || !isCFType(method->getReturnType()))
3344 // If the method is explicitly marked not-retained, it's +0.
3345 if (method->hasAttr<CFReturnsNotRetainedAttr>())
3346 return ACC_plusZero;
3348 // If the method is explicitly marked as returning retained, or its
3349 // selector follows a +1 Cocoa convention, treat it as +1.
3350 if (method->hasAttr<CFReturnsRetainedAttr>())
3353 switch (method->getSelector().getMethodFamily()) {
3356 case OMF_mutableCopy:
3361 // Otherwise, treat it as +0.
3362 return ACC_plusZero;
3366 } // end anonymous namespace
3368 bool Sema::isKnownName(StringRef name) {
3371 LookupResult R(*this, &Context.Idents.get(name), SourceLocation(),
3372 Sema::LookupOrdinaryName);
3373 return LookupName(R, TUScope, false);
3376 static void addFixitForObjCARCConversion(Sema &S,
3377 DiagnosticBuilder &DiagB,
3378 Sema::CheckedConversionKind CCK,
3379 SourceLocation afterLParen,
3383 const char *bridgeKeyword,
3384 const char *CFBridgeName) {
3385 // We handle C-style and implicit casts here.
3387 case Sema::CCK_ImplicitConversion:
3388 case Sema::CCK_CStyleCast:
3389 case Sema::CCK_OtherCast:
3391 case Sema::CCK_FunctionalCast:
3396 if (CCK == Sema::CCK_OtherCast) {
3397 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3398 SourceRange range(NCE->getOperatorLoc(),
3399 NCE->getAngleBrackets().getEnd());
3400 SmallString<32> BridgeCall;
3402 SourceManager &SM = S.getSourceManager();
3403 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3404 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3407 BridgeCall += CFBridgeName;
3408 DiagB.AddFixItHint(FixItHint::CreateReplacement(range, BridgeCall));
3412 Expr *castedE = castExpr;
3413 if (CStyleCastExpr *CCE = dyn_cast<CStyleCastExpr>(castedE))
3414 castedE = CCE->getSubExpr();
3415 castedE = castedE->IgnoreImpCasts();
3416 SourceRange range = castedE->getSourceRange();
3418 SmallString<32> BridgeCall;
3420 SourceManager &SM = S.getSourceManager();
3421 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3422 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3425 BridgeCall += CFBridgeName;
3427 if (isa<ParenExpr>(castedE)) {
3428 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3432 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3434 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3435 S.getLocForEndOfToken(range.getEnd()),
3441 if (CCK == Sema::CCK_CStyleCast) {
3442 DiagB.AddFixItHint(FixItHint::CreateInsertion(afterLParen, bridgeKeyword));
3443 } else if (CCK == Sema::CCK_OtherCast) {
3444 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3445 std::string castCode = "(";
3446 castCode += bridgeKeyword;
3447 castCode += castType.getAsString();
3449 SourceRange Range(NCE->getOperatorLoc(),
3450 NCE->getAngleBrackets().getEnd());
3451 DiagB.AddFixItHint(FixItHint::CreateReplacement(Range, castCode));
3454 std::string castCode = "(";
3455 castCode += bridgeKeyword;
3456 castCode += castType.getAsString();
3458 Expr *castedE = castExpr->IgnoreImpCasts();
3459 SourceRange range = castedE->getSourceRange();
3460 if (isa<ParenExpr>(castedE)) {
3461 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3465 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3467 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3468 S.getLocForEndOfToken(range.getEnd()),
3474 template <typename T>
3475 static inline T *getObjCBridgeAttr(const TypedefType *TD) {
3476 TypedefNameDecl *TDNDecl = TD->getDecl();
3477 QualType QT = TDNDecl->getUnderlyingType();
3478 if (QT->isPointerType()) {
3479 QT = QT->getPointeeType();
3480 if (const RecordType *RT = QT->getAs<RecordType>())
3481 if (RecordDecl *RD = RT->getDecl()->getMostRecentDecl())
3482 return RD->getAttr<T>();
3487 static ObjCBridgeRelatedAttr *ObjCBridgeRelatedAttrFromType(QualType T,
3488 TypedefNameDecl *&TDNDecl) {
3489 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3490 TDNDecl = TD->getDecl();
3491 if (ObjCBridgeRelatedAttr *ObjCBAttr =
3492 getObjCBridgeAttr<ObjCBridgeRelatedAttr>(TD))
3494 T = TDNDecl->getUnderlyingType();
3500 diagnoseObjCARCConversion(Sema &S, SourceRange castRange,
3501 QualType castType, ARCConversionTypeClass castACTC,
3502 Expr *castExpr, Expr *realCast,
3503 ARCConversionTypeClass exprACTC,
3504 Sema::CheckedConversionKind CCK) {
3505 SourceLocation loc =
3506 (castRange.isValid() ? castRange.getBegin() : castExpr->getExprLoc());
3508 if (S.makeUnavailableInSystemHeader(loc,
3509 UnavailableAttr::IR_ARCForbiddenConversion))
3512 QualType castExprType = castExpr->getType();
3513 // Defer emitting a diagnostic for bridge-related casts; that will be
3514 // handled by CheckObjCBridgeRelatedConversions.
3515 TypedefNameDecl *TDNDecl = nullptr;
3516 if ((castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable &&
3517 ObjCBridgeRelatedAttrFromType(castType, TDNDecl)) ||
3518 (exprACTC == ACTC_coreFoundation && castACTC == ACTC_retainable &&
3519 ObjCBridgeRelatedAttrFromType(castExprType, TDNDecl)))
3522 unsigned srcKind = 0;
3525 case ACTC_coreFoundation:
3527 srcKind = (castExprType->isPointerType() ? 1 : 0);
3529 case ACTC_retainable:
3530 srcKind = (castExprType->isBlockPointerType() ? 2 : 3);
3532 case ACTC_indirectRetainable:
3537 // Check whether this could be fixed with a bridge cast.
3538 SourceLocation afterLParen = S.getLocForEndOfToken(castRange.getBegin());
3539 SourceLocation noteLoc = afterLParen.isValid() ? afterLParen : loc;
3541 // Bridge from an ARC type to a CF type.
3542 if (castACTC == ACTC_retainable && isAnyRetainable(exprACTC)) {
3544 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3545 << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit
3546 << 2 // of C pointer type
3548 << unsigned(castType->isBlockPointerType()) // to ObjC|block type
3551 << castExpr->getSourceRange();
3552 bool br = S.isKnownName("CFBridgingRelease");
3553 ACCResult CreateRule =
3554 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3555 assert(CreateRule != ACC_bottom && "This cast should already be accepted.");
3556 if (CreateRule != ACC_plusOne)
3558 DiagnosticBuilder DiagB =
3559 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3560 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3562 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3563 castType, castExpr, realCast, "__bridge ",
3566 if (CreateRule != ACC_plusZero)
3568 DiagnosticBuilder DiagB =
3569 (CCK == Sema::CCK_OtherCast && !br) ?
3570 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_transfer) << castExprType :
3571 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3572 diag::note_arc_bridge_transfer)
3573 << castExprType << br;
3575 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3576 castType, castExpr, realCast, "__bridge_transfer ",
3577 br ? "CFBridgingRelease" : nullptr);
3583 // Bridge from a CF type to an ARC type.
3584 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC)) {
3585 bool br = S.isKnownName("CFBridgingRetain");
3586 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3587 << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit
3588 << unsigned(castExprType->isBlockPointerType()) // of ObjC|block type
3590 << 2 // to C pointer type
3593 << castExpr->getSourceRange();
3594 ACCResult CreateRule =
3595 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3596 assert(CreateRule != ACC_bottom && "This cast should already be accepted.");
3597 if (CreateRule != ACC_plusOne)
3599 DiagnosticBuilder DiagB =
3600 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3601 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3602 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3603 castType, castExpr, realCast, "__bridge ",
3606 if (CreateRule != ACC_plusZero)
3608 DiagnosticBuilder DiagB =
3609 (CCK == Sema::CCK_OtherCast && !br) ?
3610 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_retained) << castType :
3611 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3612 diag::note_arc_bridge_retained)
3615 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3616 castType, castExpr, realCast, "__bridge_retained ",
3617 br ? "CFBridgingRetain" : nullptr);
3623 S.Diag(loc, diag::err_arc_mismatched_cast)
3624 << (CCK != Sema::CCK_ImplicitConversion)
3625 << srcKind << castExprType << castType
3626 << castRange << castExpr->getSourceRange();
3629 template <typename TB>
3630 static bool CheckObjCBridgeNSCast(Sema &S, QualType castType, Expr *castExpr,
3631 bool &HadTheAttribute, bool warn) {
3632 QualType T = castExpr->getType();
3633 HadTheAttribute = false;
3634 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3635 TypedefNameDecl *TDNDecl = TD->getDecl();
3636 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3637 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3638 HadTheAttribute = true;
3639 if (Parm->isStr("id"))
3642 NamedDecl *Target = nullptr;
3643 // Check for an existing type with this name.
3644 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3645 Sema::LookupOrdinaryName);
3646 if (S.LookupName(R, S.TUScope)) {
3647 Target = R.getFoundDecl();
3648 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3649 ObjCInterfaceDecl *ExprClass = cast<ObjCInterfaceDecl>(Target);
3650 if (const ObjCObjectPointerType *InterfacePointerType =
3651 castType->getAsObjCInterfacePointerType()) {
3652 ObjCInterfaceDecl *CastClass
3653 = InterfacePointerType->getObjectType()->getInterface();
3654 if ((CastClass == ExprClass) ||
3655 (CastClass && CastClass->isSuperClassOf(ExprClass)))
3658 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge)
3659 << T << Target->getName() << castType->getPointeeType();
3661 } else if (castType->isObjCIdType() ||
3662 (S.Context.ObjCObjectAdoptsQTypeProtocols(
3663 castType, ExprClass)))
3664 // ok to cast to 'id'.
3665 // casting to id<p-list> is ok if bridge type adopts all of
3666 // p-list protocols.
3670 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge)
3671 << T << Target->getName() << castType;
3672 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3673 S.Diag(Target->getLocStart(), diag::note_declared_at);
3678 } else if (!castType->isObjCIdType()) {
3679 S.Diag(castExpr->getLocStart(), diag::err_objc_cf_bridged_not_interface)
3680 << castExpr->getType() << Parm;
3681 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3683 S.Diag(Target->getLocStart(), diag::note_declared_at);
3689 T = TDNDecl->getUnderlyingType();
3694 template <typename TB>
3695 static bool CheckObjCBridgeCFCast(Sema &S, QualType castType, Expr *castExpr,
3696 bool &HadTheAttribute, bool warn) {
3697 QualType T = castType;
3698 HadTheAttribute = false;
3699 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3700 TypedefNameDecl *TDNDecl = TD->getDecl();
3701 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3702 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3703 HadTheAttribute = true;
3704 if (Parm->isStr("id"))
3707 NamedDecl *Target = nullptr;
3708 // Check for an existing type with this name.
3709 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3710 Sema::LookupOrdinaryName);
3711 if (S.LookupName(R, S.TUScope)) {
3712 Target = R.getFoundDecl();
3713 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3714 ObjCInterfaceDecl *CastClass = cast<ObjCInterfaceDecl>(Target);
3715 if (const ObjCObjectPointerType *InterfacePointerType =
3716 castExpr->getType()->getAsObjCInterfacePointerType()) {
3717 ObjCInterfaceDecl *ExprClass
3718 = InterfacePointerType->getObjectType()->getInterface();
3719 if ((CastClass == ExprClass) ||
3720 (ExprClass && CastClass->isSuperClassOf(ExprClass)))
3723 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge_to_cf)
3724 << castExpr->getType()->getPointeeType() << T;
3725 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3728 } else if (castExpr->getType()->isObjCIdType() ||
3729 (S.Context.QIdProtocolsAdoptObjCObjectProtocols(
3730 castExpr->getType(), CastClass)))
3731 // ok to cast an 'id' expression to a CFtype.
3732 // ok to cast an 'id<plist>' expression to CFtype provided plist
3733 // adopts all of CFtype's ObjetiveC's class plist.
3737 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge_to_cf)
3738 << castExpr->getType() << castType;
3739 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3740 S.Diag(Target->getLocStart(), diag::note_declared_at);
3746 S.Diag(castExpr->getLocStart(), diag::err_objc_ns_bridged_invalid_cfobject)
3747 << castExpr->getType() << castType;
3748 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3750 S.Diag(Target->getLocStart(), diag::note_declared_at);
3755 T = TDNDecl->getUnderlyingType();
3760 void Sema::CheckTollFreeBridgeCast(QualType castType, Expr *castExpr) {
3761 if (!getLangOpts().ObjC1)
3763 // warn in presence of __bridge casting to or from a toll free bridge cast.
3764 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExpr->getType());
3765 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
3766 if (castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) {
3767 bool HasObjCBridgeAttr;
3768 bool ObjCBridgeAttrWillNotWarn =
3769 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3771 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3773 bool HasObjCBridgeMutableAttr;
3774 bool ObjCBridgeMutableAttrWillNotWarn =
3775 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3776 HasObjCBridgeMutableAttr, false);
3777 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3780 if (HasObjCBridgeAttr)
3781 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3783 else if (HasObjCBridgeMutableAttr)
3784 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3785 HasObjCBridgeMutableAttr, true);
3787 else if (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable) {
3788 bool HasObjCBridgeAttr;
3789 bool ObjCBridgeAttrWillNotWarn =
3790 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3792 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3794 bool HasObjCBridgeMutableAttr;
3795 bool ObjCBridgeMutableAttrWillNotWarn =
3796 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3797 HasObjCBridgeMutableAttr, false);
3798 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3801 if (HasObjCBridgeAttr)
3802 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3804 else if (HasObjCBridgeMutableAttr)
3805 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3806 HasObjCBridgeMutableAttr, true);
3810 void Sema::CheckObjCBridgeRelatedCast(QualType castType, Expr *castExpr) {
3811 QualType SrcType = castExpr->getType();
3812 if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(castExpr)) {
3813 if (PRE->isExplicitProperty()) {
3814 if (ObjCPropertyDecl *PDecl = PRE->getExplicitProperty())
3815 SrcType = PDecl->getType();
3817 else if (PRE->isImplicitProperty()) {
3818 if (ObjCMethodDecl *Getter = PRE->getImplicitPropertyGetter())
3819 SrcType = Getter->getReturnType();
3823 ARCConversionTypeClass srcExprACTC = classifyTypeForARCConversion(SrcType);
3824 ARCConversionTypeClass castExprACTC = classifyTypeForARCConversion(castType);
3825 if (srcExprACTC != ACTC_retainable || castExprACTC != ACTC_coreFoundation)
3827 CheckObjCBridgeRelatedConversions(castExpr->getLocStart(),
3828 castType, SrcType, castExpr);
3831 bool Sema::CheckTollFreeBridgeStaticCast(QualType castType, Expr *castExpr,
3833 if (!getLangOpts().ObjC1)
3835 ARCConversionTypeClass exprACTC =
3836 classifyTypeForARCConversion(castExpr->getType());
3837 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
3838 if ((castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) ||
3839 (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable)) {
3840 CheckTollFreeBridgeCast(castType, castExpr);
3841 Kind = (castACTC == ACTC_coreFoundation) ? CK_BitCast
3842 : CK_CPointerToObjCPointerCast;
3848 bool Sema::checkObjCBridgeRelatedComponents(SourceLocation Loc,
3849 QualType DestType, QualType SrcType,
3850 ObjCInterfaceDecl *&RelatedClass,
3851 ObjCMethodDecl *&ClassMethod,
3852 ObjCMethodDecl *&InstanceMethod,
3853 TypedefNameDecl *&TDNDecl,
3854 bool CfToNs, bool Diagnose) {
3855 QualType T = CfToNs ? SrcType : DestType;
3856 ObjCBridgeRelatedAttr *ObjCBAttr = ObjCBridgeRelatedAttrFromType(T, TDNDecl);
3860 IdentifierInfo *RCId = ObjCBAttr->getRelatedClass();
3861 IdentifierInfo *CMId = ObjCBAttr->getClassMethod();
3862 IdentifierInfo *IMId = ObjCBAttr->getInstanceMethod();
3865 NamedDecl *Target = nullptr;
3866 // Check for an existing type with this name.
3867 LookupResult R(*this, DeclarationName(RCId), SourceLocation(),
3868 Sema::LookupOrdinaryName);
3869 if (!LookupName(R, TUScope)) {
3871 Diag(Loc, diag::err_objc_bridged_related_invalid_class) << RCId
3872 << SrcType << DestType;
3873 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3877 Target = R.getFoundDecl();
3878 if (Target && isa<ObjCInterfaceDecl>(Target))
3879 RelatedClass = cast<ObjCInterfaceDecl>(Target);
3882 Diag(Loc, diag::err_objc_bridged_related_invalid_class_name) << RCId
3883 << SrcType << DestType;
3884 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3886 Diag(Target->getLocStart(), diag::note_declared_at);
3891 // Check for an existing class method with the given selector name.
3892 if (CfToNs && CMId) {
3893 Selector Sel = Context.Selectors.getUnarySelector(CMId);
3894 ClassMethod = RelatedClass->lookupMethod(Sel, false);
3897 Diag(Loc, diag::err_objc_bridged_related_known_method)
3898 << SrcType << DestType << Sel << false;
3899 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3905 // Check for an existing instance method with the given selector name.
3906 if (!CfToNs && IMId) {
3907 Selector Sel = Context.Selectors.getNullarySelector(IMId);
3908 InstanceMethod = RelatedClass->lookupMethod(Sel, true);
3909 if (!InstanceMethod) {
3911 Diag(Loc, diag::err_objc_bridged_related_known_method)
3912 << SrcType << DestType << Sel << true;
3913 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3922 Sema::CheckObjCBridgeRelatedConversions(SourceLocation Loc,
3923 QualType DestType, QualType SrcType,
3924 Expr *&SrcExpr, bool Diagnose) {
3925 ARCConversionTypeClass rhsExprACTC = classifyTypeForARCConversion(SrcType);
3926 ARCConversionTypeClass lhsExprACTC = classifyTypeForARCConversion(DestType);
3927 bool CfToNs = (rhsExprACTC == ACTC_coreFoundation && lhsExprACTC == ACTC_retainable);
3928 bool NsToCf = (rhsExprACTC == ACTC_retainable && lhsExprACTC == ACTC_coreFoundation);
3929 if (!CfToNs && !NsToCf)
3932 ObjCInterfaceDecl *RelatedClass;
3933 ObjCMethodDecl *ClassMethod = nullptr;
3934 ObjCMethodDecl *InstanceMethod = nullptr;
3935 TypedefNameDecl *TDNDecl = nullptr;
3936 if (!checkObjCBridgeRelatedComponents(Loc, DestType, SrcType, RelatedClass,
3937 ClassMethod, InstanceMethod, TDNDecl,
3942 // Implicit conversion from CF to ObjC object is needed.
3945 std::string ExpressionString = "[";
3946 ExpressionString += RelatedClass->getNameAsString();
3947 ExpressionString += " ";
3948 ExpressionString += ClassMethod->getSelector().getAsString();
3949 SourceLocation SrcExprEndLoc = getLocForEndOfToken(SrcExpr->getLocEnd());
3950 // Provide a fixit: [RelatedClass ClassMethod SrcExpr]
3951 Diag(Loc, diag::err_objc_bridged_related_known_method)
3952 << SrcType << DestType << ClassMethod->getSelector() << false
3953 << FixItHint::CreateInsertion(SrcExpr->getLocStart(), ExpressionString)
3954 << FixItHint::CreateInsertion(SrcExprEndLoc, "]");
3955 Diag(RelatedClass->getLocStart(), diag::note_declared_at);
3956 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3958 QualType receiverType = Context.getObjCInterfaceType(RelatedClass);
3960 Expr *args[] = { SrcExpr };
3961 ExprResult msg = BuildClassMessageImplicit(receiverType, false,
3962 ClassMethod->getLocation(),
3963 ClassMethod->getSelector(), ClassMethod,
3964 MultiExprArg(args, 1));
3965 SrcExpr = msg.get();
3971 // Implicit conversion from ObjC type to CF object is needed.
3972 if (InstanceMethod) {
3974 std::string ExpressionString;
3975 SourceLocation SrcExprEndLoc =
3976 getLocForEndOfToken(SrcExpr->getLocEnd());
3977 if (InstanceMethod->isPropertyAccessor())
3978 if (const ObjCPropertyDecl *PDecl =
3979 InstanceMethod->findPropertyDecl()) {
3980 // fixit: ObjectExpr.propertyname when it is aproperty accessor.
3981 ExpressionString = ".";
3982 ExpressionString += PDecl->getNameAsString();
3983 Diag(Loc, diag::err_objc_bridged_related_known_method)
3984 << SrcType << DestType << InstanceMethod->getSelector() << true
3985 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
3987 if (ExpressionString.empty()) {
3988 // Provide a fixit: [ObjectExpr InstanceMethod]
3989 ExpressionString = " ";
3990 ExpressionString += InstanceMethod->getSelector().getAsString();
3991 ExpressionString += "]";
3993 Diag(Loc, diag::err_objc_bridged_related_known_method)
3994 << SrcType << DestType << InstanceMethod->getSelector() << true
3995 << FixItHint::CreateInsertion(SrcExpr->getLocStart(), "[")
3996 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
3998 Diag(RelatedClass->getLocStart(), diag::note_declared_at);
3999 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
4002 BuildInstanceMessageImplicit(SrcExpr, SrcType,
4003 InstanceMethod->getLocation(),
4004 InstanceMethod->getSelector(),
4005 InstanceMethod, None);
4006 SrcExpr = msg.get();
4014 Sema::ARCConversionResult
4015 Sema::CheckObjCARCConversion(SourceRange castRange, QualType castType,
4016 Expr *&castExpr, CheckedConversionKind CCK,
4018 bool DiagnoseCFAudited,
4019 BinaryOperatorKind Opc) {
4020 QualType castExprType = castExpr->getType();
4022 // For the purposes of the classification, we assume reference types
4023 // will bind to temporaries.
4024 QualType effCastType = castType;
4025 if (const ReferenceType *ref = castType->getAs<ReferenceType>())
4026 effCastType = ref->getPointeeType();
4028 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExprType);
4029 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(effCastType);
4030 if (exprACTC == castACTC) {
4031 // Check for viability and report error if casting an rvalue to a
4032 // life-time qualifier.
4033 if (castACTC == ACTC_retainable &&
4034 (CCK == CCK_CStyleCast || CCK == CCK_OtherCast) &&
4035 castType != castExprType) {
4036 const Type *DT = castType.getTypePtr();
4037 QualType QDT = castType;
4038 // We desugar some types but not others. We ignore those
4039 // that cannot happen in a cast; i.e. auto, and those which
4040 // should not be de-sugared; i.e typedef.
4041 if (const ParenType *PT = dyn_cast<ParenType>(DT))
4042 QDT = PT->desugar();
4043 else if (const TypeOfType *TP = dyn_cast<TypeOfType>(DT))
4044 QDT = TP->desugar();
4045 else if (const AttributedType *AT = dyn_cast<AttributedType>(DT))
4046 QDT = AT->desugar();
4047 if (QDT != castType &&
4048 QDT.getObjCLifetime() != Qualifiers::OCL_None) {
4050 SourceLocation loc = (castRange.isValid() ? castRange.getBegin()
4051 : castExpr->getExprLoc());
4052 Diag(loc, diag::err_arc_nolifetime_behavior);
4060 if (isAnyCLike(exprACTC) && isAnyCLike(castACTC)) return ACR_okay;
4062 // Allow all of these types to be cast to integer types (but not
4064 if (castACTC == ACTC_none && castType->isIntegralType(Context))
4067 // Allow casts between pointers to lifetime types (e.g., __strong id*)
4068 // and pointers to void (e.g., cv void *). Casting from void* to lifetime*
4069 // must be explicit.
4070 if (exprACTC == ACTC_indirectRetainable && castACTC == ACTC_voidPtr)
4072 if (castACTC == ACTC_indirectRetainable && exprACTC == ACTC_voidPtr &&
4073 CCK != CCK_ImplicitConversion)
4076 switch (ARCCastChecker(Context, exprACTC, castACTC, false).Visit(castExpr)) {
4077 // For invalid casts, fall through.
4081 // Do nothing for both bottom and +0.
4086 // If the result is +1, consume it here.
4088 castExpr = ImplicitCastExpr::Create(Context, castExpr->getType(),
4089 CK_ARCConsumeObject, castExpr,
4090 nullptr, VK_RValue);
4091 Cleanup.setExprNeedsCleanups(true);
4095 // If this is a non-implicit cast from id or block type to a
4096 // CoreFoundation type, delay complaining in case the cast is used
4097 // in an acceptable context.
4098 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC) &&
4099 CCK != CCK_ImplicitConversion)
4100 return ACR_unbridged;
4102 // Issue a diagnostic about a missing @-sign when implicit casting a cstring
4103 // to 'NSString *', instead of falling through to report a "bridge cast"
4105 if (castACTC == ACTC_retainable && exprACTC == ACTC_none &&
4106 ConversionToObjCStringLiteralCheck(castType, castExpr, Diagnose))
4109 // Do not issue "bridge cast" diagnostic when implicit casting
4110 // a retainable object to a CF type parameter belonging to an audited
4111 // CF API function. Let caller issue a normal type mismatched diagnostic
4113 if ((!DiagnoseCFAudited || exprACTC != ACTC_retainable ||
4114 castACTC != ACTC_coreFoundation) &&
4115 !(exprACTC == ACTC_voidPtr && castACTC == ACTC_retainable &&
4116 (Opc == BO_NE || Opc == BO_EQ))) {
4118 diagnoseObjCARCConversion(*this, castRange, castType, castACTC, castExpr,
4119 castExpr, exprACTC, CCK);
4125 /// Given that we saw an expression with the ARCUnbridgedCastTy
4126 /// placeholder type, complain bitterly.
4127 void Sema::diagnoseARCUnbridgedCast(Expr *e) {
4128 // We expect the spurious ImplicitCastExpr to already have been stripped.
4129 assert(!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast));
4130 CastExpr *realCast = cast<CastExpr>(e->IgnoreParens());
4132 SourceRange castRange;
4134 CheckedConversionKind CCK;
4136 if (CStyleCastExpr *cast = dyn_cast<CStyleCastExpr>(realCast)) {
4137 castRange = SourceRange(cast->getLParenLoc(), cast->getRParenLoc());
4138 castType = cast->getTypeAsWritten();
4139 CCK = CCK_CStyleCast;
4140 } else if (ExplicitCastExpr *cast = dyn_cast<ExplicitCastExpr>(realCast)) {
4141 castRange = cast->getTypeInfoAsWritten()->getTypeLoc().getSourceRange();
4142 castType = cast->getTypeAsWritten();
4143 CCK = CCK_OtherCast;
4145 castType = cast->getType();
4146 CCK = CCK_ImplicitConversion;
4149 ARCConversionTypeClass castACTC =
4150 classifyTypeForARCConversion(castType.getNonReferenceType());
4152 Expr *castExpr = realCast->getSubExpr();
4153 assert(classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable);
4155 diagnoseObjCARCConversion(*this, castRange, castType, castACTC,
4156 castExpr, realCast, ACTC_retainable, CCK);
4159 /// stripARCUnbridgedCast - Given an expression of ARCUnbridgedCast
4160 /// type, remove the placeholder cast.
4161 Expr *Sema::stripARCUnbridgedCast(Expr *e) {
4162 assert(e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast));
4164 if (ParenExpr *pe = dyn_cast<ParenExpr>(e)) {
4165 Expr *sub = stripARCUnbridgedCast(pe->getSubExpr());
4166 return new (Context) ParenExpr(pe->getLParen(), pe->getRParen(), sub);
4167 } else if (UnaryOperator *uo = dyn_cast<UnaryOperator>(e)) {
4168 assert(uo->getOpcode() == UO_Extension);
4169 Expr *sub = stripARCUnbridgedCast(uo->getSubExpr());
4170 return new (Context) UnaryOperator(sub, UO_Extension, sub->getType(),
4171 sub->getValueKind(), sub->getObjectKind(),
4172 uo->getOperatorLoc());
4173 } else if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) {
4174 assert(!gse->isResultDependent());
4176 unsigned n = gse->getNumAssocs();
4177 SmallVector<Expr*, 4> subExprs(n);
4178 SmallVector<TypeSourceInfo*, 4> subTypes(n);
4179 for (unsigned i = 0; i != n; ++i) {
4180 subTypes[i] = gse->getAssocTypeSourceInfo(i);
4181 Expr *sub = gse->getAssocExpr(i);
4182 if (i == gse->getResultIndex())
4183 sub = stripARCUnbridgedCast(sub);
4187 return new (Context) GenericSelectionExpr(Context, gse->getGenericLoc(),
4188 gse->getControllingExpr(),
4190 gse->getDefaultLoc(),
4191 gse->getRParenLoc(),
4192 gse->containsUnexpandedParameterPack(),
4193 gse->getResultIndex());
4195 assert(isa<ImplicitCastExpr>(e) && "bad form of unbridged cast!");
4196 return cast<ImplicitCastExpr>(e)->getSubExpr();
4200 bool Sema::CheckObjCARCUnavailableWeakConversion(QualType castType,
4201 QualType exprType) {
4202 QualType canCastType =
4203 Context.getCanonicalType(castType).getUnqualifiedType();
4204 QualType canExprType =
4205 Context.getCanonicalType(exprType).getUnqualifiedType();
4206 if (isa<ObjCObjectPointerType>(canCastType) &&
4207 castType.getObjCLifetime() == Qualifiers::OCL_Weak &&
4208 canExprType->isObjCObjectPointerType()) {
4209 if (const ObjCObjectPointerType *ObjT =
4210 canExprType->getAs<ObjCObjectPointerType>())
4211 if (const ObjCInterfaceDecl *ObjI = ObjT->getInterfaceDecl())
4212 return !ObjI->isArcWeakrefUnavailable();
4217 /// Look for an ObjCReclaimReturnedObject cast and destroy it.
4218 static Expr *maybeUndoReclaimObject(Expr *e) {
4219 // For now, we just undo operands that are *immediately* reclaim
4220 // expressions, which prevents the vast majority of potential
4221 // problems here. To catch them all, we'd need to rebuild arbitrary
4222 // value-propagating subexpressions --- we can't reliably rebuild
4223 // in-place because of expression sharing.
4224 if (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e))
4225 if (ice->getCastKind() == CK_ARCReclaimReturnedObject)
4226 return ice->getSubExpr();
4231 ExprResult Sema::BuildObjCBridgedCast(SourceLocation LParenLoc,
4232 ObjCBridgeCastKind Kind,
4233 SourceLocation BridgeKeywordLoc,
4234 TypeSourceInfo *TSInfo,
4236 ExprResult SubResult = UsualUnaryConversions(SubExpr);
4237 if (SubResult.isInvalid()) return ExprError();
4238 SubExpr = SubResult.get();
4240 QualType T = TSInfo->getType();
4241 QualType FromType = SubExpr->getType();
4245 bool MustConsume = false;
4246 if (T->isDependentType() || SubExpr->isTypeDependent()) {
4247 // Okay: we'll build a dependent expression type.
4249 } else if (T->isObjCARCBridgableType() && FromType->isCARCBridgableType()) {
4251 CK = (T->isBlockPointerType() ? CK_AnyPointerToBlockPointerCast
4252 : CK_CPointerToObjCPointerCast);
4257 case OBC_BridgeRetained: {
4258 bool br = isKnownName("CFBridgingRelease");
4259 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4262 << (T->isBlockPointerType()? 1 : 0)
4264 << SubExpr->getSourceRange()
4266 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4267 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge");
4268 Diag(BridgeKeywordLoc, diag::note_arc_bridge_transfer)
4270 << FixItHint::CreateReplacement(BridgeKeywordLoc,
4271 br ? "CFBridgingRelease "
4272 : "__bridge_transfer ");
4278 case OBC_BridgeTransfer:
4279 // We must consume the Objective-C object produced by the cast.
4283 } else if (T->isCARCBridgableType() && FromType->isObjCARCBridgableType()) {
4288 // Reclaiming a value that's going to be __bridge-casted to CF
4289 // is very dangerous, so we don't do it.
4290 SubExpr = maybeUndoReclaimObject(SubExpr);
4293 case OBC_BridgeRetained:
4294 // Produce the object before casting it.
4295 SubExpr = ImplicitCastExpr::Create(Context, FromType,
4296 CK_ARCProduceObject,
4297 SubExpr, nullptr, VK_RValue);
4300 case OBC_BridgeTransfer: {
4301 bool br = isKnownName("CFBridgingRetain");
4302 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4303 << (FromType->isBlockPointerType()? 1 : 0)
4307 << SubExpr->getSourceRange()
4310 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4311 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge ");
4312 Diag(BridgeKeywordLoc, diag::note_arc_bridge_retained)
4314 << FixItHint::CreateReplacement(BridgeKeywordLoc,
4315 br ? "CFBridgingRetain " : "__bridge_retained");
4322 Diag(LParenLoc, diag::err_arc_bridge_cast_incompatible)
4323 << FromType << T << Kind
4324 << SubExpr->getSourceRange()
4325 << TSInfo->getTypeLoc().getSourceRange();
4329 Expr *Result = new (Context) ObjCBridgedCastExpr(LParenLoc, Kind, CK,
4334 Cleanup.setExprNeedsCleanups(true);
4335 Result = ImplicitCastExpr::Create(Context, T, CK_ARCConsumeObject, Result,
4336 nullptr, VK_RValue);
4342 ExprResult Sema::ActOnObjCBridgedCast(Scope *S,
4343 SourceLocation LParenLoc,
4344 ObjCBridgeCastKind Kind,
4345 SourceLocation BridgeKeywordLoc,
4347 SourceLocation RParenLoc,
4349 TypeSourceInfo *TSInfo = nullptr;
4350 QualType T = GetTypeFromParser(Type, &TSInfo);
4351 if (Kind == OBC_Bridge)
4352 CheckTollFreeBridgeCast(T, SubExpr);
4354 TSInfo = Context.getTrivialTypeSourceInfo(T, LParenLoc);
4355 return BuildObjCBridgedCast(LParenLoc, Kind, BridgeKeywordLoc, TSInfo,