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;
1041 = Context.getObjCObjectPointerType(
1042 Context.getObjCInterfaceType(NSDictionaryDecl));
1043 return MaybeBindToTemporary(ObjCDictionaryLiteral::Create(
1044 Context, Elements, HasPackExpansions, Ty,
1045 DictionaryWithObjectsMethod, SR));
1048 ExprResult Sema::BuildObjCEncodeExpression(SourceLocation AtLoc,
1049 TypeSourceInfo *EncodedTypeInfo,
1050 SourceLocation RParenLoc) {
1051 QualType EncodedType = EncodedTypeInfo->getType();
1053 if (EncodedType->isDependentType())
1054 StrTy = Context.DependentTy;
1056 if (!EncodedType->getAsArrayTypeUnsafe() && //// Incomplete array is handled.
1057 !EncodedType->isVoidType()) // void is handled too.
1058 if (RequireCompleteType(AtLoc, EncodedType,
1059 diag::err_incomplete_type_objc_at_encode,
1060 EncodedTypeInfo->getTypeLoc()))
1064 QualType NotEncodedT;
1065 Context.getObjCEncodingForType(EncodedType, Str, nullptr, &NotEncodedT);
1066 if (!NotEncodedT.isNull())
1067 Diag(AtLoc, diag::warn_incomplete_encoded_type)
1068 << EncodedType << NotEncodedT;
1070 // The type of @encode is the same as the type of the corresponding string,
1071 // which is an array type.
1072 StrTy = Context.CharTy;
1073 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
1074 if (getLangOpts().CPlusPlus || getLangOpts().ConstStrings)
1076 StrTy = Context.getConstantArrayType(StrTy, llvm::APInt(32, Str.size()+1),
1077 ArrayType::Normal, 0);
1080 return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc);
1083 ExprResult Sema::ParseObjCEncodeExpression(SourceLocation AtLoc,
1084 SourceLocation EncodeLoc,
1085 SourceLocation LParenLoc,
1087 SourceLocation RParenLoc) {
1088 // FIXME: Preserve type source info ?
1089 TypeSourceInfo *TInfo;
1090 QualType EncodedType = GetTypeFromParser(ty, &TInfo);
1092 TInfo = Context.getTrivialTypeSourceInfo(EncodedType,
1093 getLocForEndOfToken(LParenLoc));
1095 return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc);
1098 static bool HelperToDiagnoseMismatchedMethodsInGlobalPool(Sema &S,
1099 SourceLocation AtLoc,
1100 SourceLocation LParenLoc,
1101 SourceLocation RParenLoc,
1102 ObjCMethodDecl *Method,
1103 ObjCMethodList &MethList) {
1104 ObjCMethodList *M = &MethList;
1105 bool Warned = false;
1106 for (M = M->getNext(); M; M=M->getNext()) {
1107 ObjCMethodDecl *MatchingMethodDecl = M->getMethod();
1108 if (MatchingMethodDecl == Method ||
1109 isa<ObjCImplDecl>(MatchingMethodDecl->getDeclContext()) ||
1110 MatchingMethodDecl->getSelector() != Method->getSelector())
1112 if (!S.MatchTwoMethodDeclarations(Method,
1113 MatchingMethodDecl, Sema::MMS_loose)) {
1116 S.Diag(AtLoc, diag::warning_multiple_selectors)
1117 << Method->getSelector() << FixItHint::CreateInsertion(LParenLoc, "(")
1118 << FixItHint::CreateInsertion(RParenLoc, ")");
1119 S.Diag(Method->getLocation(), diag::note_method_declared_at)
1120 << Method->getDeclName();
1122 S.Diag(MatchingMethodDecl->getLocation(), diag::note_method_declared_at)
1123 << MatchingMethodDecl->getDeclName();
1129 static void DiagnoseMismatchedSelectors(Sema &S, SourceLocation AtLoc,
1130 ObjCMethodDecl *Method,
1131 SourceLocation LParenLoc,
1132 SourceLocation RParenLoc,
1133 bool WarnMultipleSelectors) {
1134 if (!WarnMultipleSelectors ||
1135 S.Diags.isIgnored(diag::warning_multiple_selectors, SourceLocation()))
1137 bool Warned = false;
1138 for (Sema::GlobalMethodPool::iterator b = S.MethodPool.begin(),
1139 e = S.MethodPool.end(); b != e; b++) {
1140 // first, instance methods
1141 ObjCMethodList &InstMethList = b->second.first;
1142 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1143 Method, InstMethList))
1146 // second, class methods
1147 ObjCMethodList &ClsMethList = b->second.second;
1148 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1149 Method, ClsMethList) || Warned)
1154 ExprResult Sema::ParseObjCSelectorExpression(Selector Sel,
1155 SourceLocation AtLoc,
1156 SourceLocation SelLoc,
1157 SourceLocation LParenLoc,
1158 SourceLocation RParenLoc,
1159 bool WarnMultipleSelectors) {
1160 ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel,
1161 SourceRange(LParenLoc, RParenLoc));
1163 Method = LookupFactoryMethodInGlobalPool(Sel,
1164 SourceRange(LParenLoc, RParenLoc));
1166 if (const ObjCMethodDecl *OM = SelectorsForTypoCorrection(Sel)) {
1167 Selector MatchedSel = OM->getSelector();
1168 SourceRange SelectorRange(LParenLoc.getLocWithOffset(1),
1169 RParenLoc.getLocWithOffset(-1));
1170 Diag(SelLoc, diag::warn_undeclared_selector_with_typo)
1171 << Sel << MatchedSel
1172 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1175 Diag(SelLoc, diag::warn_undeclared_selector) << Sel;
1177 DiagnoseMismatchedSelectors(*this, AtLoc, Method, LParenLoc, RParenLoc,
1178 WarnMultipleSelectors);
1181 Method->getImplementationControl() != ObjCMethodDecl::Optional &&
1182 !getSourceManager().isInSystemHeader(Method->getLocation()))
1183 ReferencedSelectors.insert(std::make_pair(Sel, AtLoc));
1185 // In ARC, forbid the user from using @selector for
1186 // retain/release/autorelease/dealloc/retainCount.
1187 if (getLangOpts().ObjCAutoRefCount) {
1188 switch (Sel.getMethodFamily()) {
1191 case OMF_autorelease:
1192 case OMF_retainCount:
1194 Diag(AtLoc, diag::err_arc_illegal_selector) <<
1195 Sel << SourceRange(LParenLoc, RParenLoc);
1203 case OMF_mutableCopy:
1206 case OMF_initialize:
1207 case OMF_performSelector:
1211 QualType Ty = Context.getObjCSelType();
1212 return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc);
1215 ExprResult Sema::ParseObjCProtocolExpression(IdentifierInfo *ProtocolId,
1216 SourceLocation AtLoc,
1217 SourceLocation ProtoLoc,
1218 SourceLocation LParenLoc,
1219 SourceLocation ProtoIdLoc,
1220 SourceLocation RParenLoc) {
1221 ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoIdLoc);
1223 Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId;
1226 if (PDecl->hasDefinition())
1227 PDecl = PDecl->getDefinition();
1229 QualType Ty = Context.getObjCProtoType();
1232 Ty = Context.getObjCObjectPointerType(Ty);
1233 return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, ProtoIdLoc, RParenLoc);
1236 /// Try to capture an implicit reference to 'self'.
1237 ObjCMethodDecl *Sema::tryCaptureObjCSelf(SourceLocation Loc) {
1238 DeclContext *DC = getFunctionLevelDeclContext();
1240 // If we're not in an ObjC method, error out. Note that, unlike the
1241 // C++ case, we don't require an instance method --- class methods
1242 // still have a 'self', and we really do still need to capture it!
1243 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(DC);
1247 tryCaptureVariable(method->getSelfDecl(), Loc);
1252 static QualType stripObjCInstanceType(ASTContext &Context, QualType T) {
1253 QualType origType = T;
1254 if (auto nullability = AttributedType::stripOuterNullability(T)) {
1255 if (T == Context.getObjCInstanceType()) {
1256 return Context.getAttributedType(
1257 AttributedType::getNullabilityAttrKind(*nullability),
1258 Context.getObjCIdType(),
1259 Context.getObjCIdType());
1265 if (T == Context.getObjCInstanceType())
1266 return Context.getObjCIdType();
1271 /// Determine the result type of a message send based on the receiver type,
1272 /// method, and the kind of message send.
1274 /// This is the "base" result type, which will still need to be adjusted
1275 /// to account for nullability.
1276 static QualType getBaseMessageSendResultType(Sema &S,
1277 QualType ReceiverType,
1278 ObjCMethodDecl *Method,
1279 bool isClassMessage,
1280 bool isSuperMessage) {
1281 assert(Method && "Must have a method");
1282 if (!Method->hasRelatedResultType())
1283 return Method->getSendResultType(ReceiverType);
1285 ASTContext &Context = S.Context;
1287 // Local function that transfers the nullability of the method's
1288 // result type to the returned result.
1289 auto transferNullability = [&](QualType type) -> QualType {
1290 // If the method's result type has nullability, extract it.
1291 if (auto nullability = Method->getSendResultType(ReceiverType)
1292 ->getNullability(Context)){
1293 // Strip off any outer nullability sugar from the provided type.
1294 (void)AttributedType::stripOuterNullability(type);
1296 // Form a new attributed type using the method result type's nullability.
1297 return Context.getAttributedType(
1298 AttributedType::getNullabilityAttrKind(*nullability),
1306 // If a method has a related return type:
1307 // - if the method found is an instance method, but the message send
1308 // was a class message send, T is the declared return type of the method
1310 if (Method->isInstanceMethod() && isClassMessage)
1311 return stripObjCInstanceType(Context,
1312 Method->getSendResultType(ReceiverType));
1314 // - if the receiver is super, T is a pointer to the class of the
1315 // enclosing method definition
1316 if (isSuperMessage) {
1317 if (ObjCMethodDecl *CurMethod = S.getCurMethodDecl())
1318 if (ObjCInterfaceDecl *Class = CurMethod->getClassInterface()) {
1319 return transferNullability(
1320 Context.getObjCObjectPointerType(
1321 Context.getObjCInterfaceType(Class)));
1325 // - if the receiver is the name of a class U, T is a pointer to U
1326 if (ReceiverType->getAsObjCInterfaceType())
1327 return transferNullability(Context.getObjCObjectPointerType(ReceiverType));
1328 // - if the receiver is of type Class or qualified Class type,
1329 // T is the declared return type of the method.
1330 if (ReceiverType->isObjCClassType() ||
1331 ReceiverType->isObjCQualifiedClassType())
1332 return stripObjCInstanceType(Context,
1333 Method->getSendResultType(ReceiverType));
1335 // - if the receiver is id, qualified id, Class, or qualified Class, T
1336 // is the receiver type, otherwise
1337 // - T is the type of the receiver expression.
1338 return transferNullability(ReceiverType);
1341 QualType Sema::getMessageSendResultType(QualType ReceiverType,
1342 ObjCMethodDecl *Method,
1343 bool isClassMessage,
1344 bool isSuperMessage) {
1345 // Produce the result type.
1346 QualType resultType = getBaseMessageSendResultType(*this, ReceiverType,
1351 // If this is a class message, ignore the nullability of the receiver.
1355 // Map the nullability of the result into a table index.
1356 unsigned receiverNullabilityIdx = 0;
1357 if (auto nullability = ReceiverType->getNullability(Context))
1358 receiverNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1360 unsigned resultNullabilityIdx = 0;
1361 if (auto nullability = resultType->getNullability(Context))
1362 resultNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1364 // The table of nullability mappings, indexed by the receiver's nullability
1365 // and then the result type's nullability.
1366 static const uint8_t None = 0;
1367 static const uint8_t NonNull = 1;
1368 static const uint8_t Nullable = 2;
1369 static const uint8_t Unspecified = 3;
1370 static const uint8_t nullabilityMap[4][4] = {
1371 // None NonNull Nullable Unspecified
1372 /* None */ { None, None, Nullable, None },
1373 /* NonNull */ { None, NonNull, Nullable, Unspecified },
1374 /* Nullable */ { Nullable, Nullable, Nullable, Nullable },
1375 /* Unspecified */ { None, Unspecified, Nullable, Unspecified }
1378 unsigned newResultNullabilityIdx
1379 = nullabilityMap[receiverNullabilityIdx][resultNullabilityIdx];
1380 if (newResultNullabilityIdx == resultNullabilityIdx)
1383 // Strip off the existing nullability. This removes as little type sugar as
1386 if (auto attributed = dyn_cast<AttributedType>(resultType.getTypePtr())) {
1387 resultType = attributed->getModifiedType();
1389 resultType = resultType.getDesugaredType(Context);
1391 } while (resultType->getNullability(Context));
1393 // Add nullability back if needed.
1394 if (newResultNullabilityIdx > 0) {
1396 = static_cast<NullabilityKind>(newResultNullabilityIdx-1);
1397 return Context.getAttributedType(
1398 AttributedType::getNullabilityAttrKind(newNullability),
1399 resultType, resultType);
1405 /// Look for an ObjC method whose result type exactly matches the given type.
1406 static const ObjCMethodDecl *
1407 findExplicitInstancetypeDeclarer(const ObjCMethodDecl *MD,
1408 QualType instancetype) {
1409 if (MD->getReturnType() == instancetype)
1412 // For these purposes, a method in an @implementation overrides a
1413 // declaration in the @interface.
1414 if (const ObjCImplDecl *impl =
1415 dyn_cast<ObjCImplDecl>(MD->getDeclContext())) {
1416 const ObjCContainerDecl *iface;
1417 if (const ObjCCategoryImplDecl *catImpl =
1418 dyn_cast<ObjCCategoryImplDecl>(impl)) {
1419 iface = catImpl->getCategoryDecl();
1421 iface = impl->getClassInterface();
1424 const ObjCMethodDecl *ifaceMD =
1425 iface->getMethod(MD->getSelector(), MD->isInstanceMethod());
1426 if (ifaceMD) return findExplicitInstancetypeDeclarer(ifaceMD, instancetype);
1429 SmallVector<const ObjCMethodDecl *, 4> overrides;
1430 MD->getOverriddenMethods(overrides);
1431 for (unsigned i = 0, e = overrides.size(); i != e; ++i) {
1432 if (const ObjCMethodDecl *result =
1433 findExplicitInstancetypeDeclarer(overrides[i], instancetype))
1440 void Sema::EmitRelatedResultTypeNoteForReturn(QualType destType) {
1441 // Only complain if we're in an ObjC method and the required return
1442 // type doesn't match the method's declared return type.
1443 ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurContext);
1444 if (!MD || !MD->hasRelatedResultType() ||
1445 Context.hasSameUnqualifiedType(destType, MD->getReturnType()))
1448 // Look for a method overridden by this method which explicitly uses
1450 if (const ObjCMethodDecl *overridden =
1451 findExplicitInstancetypeDeclarer(MD, Context.getObjCInstanceType())) {
1452 SourceRange range = overridden->getReturnTypeSourceRange();
1453 SourceLocation loc = range.getBegin();
1454 if (loc.isInvalid())
1455 loc = overridden->getLocation();
1456 Diag(loc, diag::note_related_result_type_explicit)
1457 << /*current method*/ 1 << range;
1461 // Otherwise, if we have an interesting method family, note that.
1462 // This should always trigger if the above didn't.
1463 if (ObjCMethodFamily family = MD->getMethodFamily())
1464 Diag(MD->getLocation(), diag::note_related_result_type_family)
1465 << /*current method*/ 1
1469 void Sema::EmitRelatedResultTypeNote(const Expr *E) {
1470 E = E->IgnoreParenImpCasts();
1471 const ObjCMessageExpr *MsgSend = dyn_cast<ObjCMessageExpr>(E);
1475 const ObjCMethodDecl *Method = MsgSend->getMethodDecl();
1479 if (!Method->hasRelatedResultType())
1482 if (Context.hasSameUnqualifiedType(
1483 Method->getReturnType().getNonReferenceType(), MsgSend->getType()))
1486 if (!Context.hasSameUnqualifiedType(Method->getReturnType(),
1487 Context.getObjCInstanceType()))
1490 Diag(Method->getLocation(), diag::note_related_result_type_inferred)
1491 << Method->isInstanceMethod() << Method->getSelector()
1492 << MsgSend->getType();
1495 bool Sema::CheckMessageArgumentTypes(QualType ReceiverType,
1498 ArrayRef<SourceLocation> SelectorLocs,
1499 ObjCMethodDecl *Method,
1500 bool isClassMessage, bool isSuperMessage,
1501 SourceLocation lbrac, SourceLocation rbrac,
1502 SourceRange RecRange,
1503 QualType &ReturnType, ExprValueKind &VK) {
1504 SourceLocation SelLoc;
1505 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
1506 SelLoc = SelectorLocs.front();
1511 // Apply default argument promotion as for (C99 6.5.2.2p6).
1512 for (unsigned i = 0, e = Args.size(); i != e; i++) {
1513 if (Args[i]->isTypeDependent())
1517 if (getLangOpts().DebuggerSupport) {
1518 QualType paramTy; // ignored
1519 result = checkUnknownAnyArg(SelLoc, Args[i], paramTy);
1521 result = DefaultArgumentPromotion(Args[i]);
1523 if (result.isInvalid())
1525 Args[i] = result.get();
1529 if (getLangOpts().ObjCAutoRefCount)
1530 DiagID = diag::err_arc_method_not_found;
1532 DiagID = isClassMessage ? diag::warn_class_method_not_found
1533 : diag::warn_inst_method_not_found;
1534 if (!getLangOpts().DebuggerSupport) {
1535 const ObjCMethodDecl *OMD = SelectorsForTypoCorrection(Sel, ReceiverType);
1536 if (OMD && !OMD->isInvalidDecl()) {
1537 if (getLangOpts().ObjCAutoRefCount)
1538 DiagID = diag::error_method_not_found_with_typo;
1540 DiagID = isClassMessage ? diag::warn_class_method_not_found_with_typo
1541 : diag::warn_instance_method_not_found_with_typo;
1542 Selector MatchedSel = OMD->getSelector();
1543 SourceRange SelectorRange(SelectorLocs.front(), SelectorLocs.back());
1544 if (MatchedSel.isUnarySelector())
1545 Diag(SelLoc, DiagID)
1546 << Sel<< isClassMessage << MatchedSel
1547 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1549 Diag(SelLoc, DiagID) << Sel<< isClassMessage << MatchedSel;
1552 Diag(SelLoc, DiagID)
1553 << Sel << isClassMessage << SourceRange(SelectorLocs.front(),
1554 SelectorLocs.back());
1555 // Find the class to which we are sending this message.
1556 if (ReceiverType->isObjCObjectPointerType()) {
1557 if (ObjCInterfaceDecl *ThisClass =
1558 ReceiverType->getAs<ObjCObjectPointerType>()->getInterfaceDecl()) {
1559 Diag(ThisClass->getLocation(), diag::note_receiver_class_declared);
1560 if (!RecRange.isInvalid())
1561 if (ThisClass->lookupClassMethod(Sel))
1562 Diag(RecRange.getBegin(),diag::note_receiver_expr_here)
1563 << FixItHint::CreateReplacement(RecRange,
1564 ThisClass->getNameAsString());
1569 // In debuggers, we want to use __unknown_anytype for these
1570 // results so that clients can cast them.
1571 if (getLangOpts().DebuggerSupport) {
1572 ReturnType = Context.UnknownAnyTy;
1574 ReturnType = Context.getObjCIdType();
1580 ReturnType = getMessageSendResultType(ReceiverType, Method, isClassMessage,
1582 VK = Expr::getValueKindForType(Method->getReturnType());
1584 unsigned NumNamedArgs = Sel.getNumArgs();
1585 // Method might have more arguments than selector indicates. This is due
1586 // to addition of c-style arguments in method.
1587 if (Method->param_size() > Sel.getNumArgs())
1588 NumNamedArgs = Method->param_size();
1589 // FIXME. This need be cleaned up.
1590 if (Args.size() < NumNamedArgs) {
1591 Diag(SelLoc, diag::err_typecheck_call_too_few_args)
1592 << 2 << NumNamedArgs << static_cast<unsigned>(Args.size());
1596 // Compute the set of type arguments to be substituted into each parameter
1598 Optional<ArrayRef<QualType>> typeArgs
1599 = ReceiverType->getObjCSubstitutions(Method->getDeclContext());
1600 bool IsError = false;
1601 for (unsigned i = 0; i < NumNamedArgs; i++) {
1602 // We can't do any type-checking on a type-dependent argument.
1603 if (Args[i]->isTypeDependent())
1606 Expr *argExpr = Args[i];
1608 ParmVarDecl *param = Method->parameters()[i];
1609 assert(argExpr && "CheckMessageArgumentTypes(): missing expression");
1611 // Strip the unbridged-cast placeholder expression off unless it's
1612 // a consumed argument.
1613 if (argExpr->hasPlaceholderType(BuiltinType::ARCUnbridgedCast) &&
1614 !param->hasAttr<CFConsumedAttr>())
1615 argExpr = stripARCUnbridgedCast(argExpr);
1617 // If the parameter is __unknown_anytype, infer its type
1618 // from the argument.
1619 if (param->getType() == Context.UnknownAnyTy) {
1621 ExprResult argE = checkUnknownAnyArg(SelLoc, argExpr, paramType);
1622 if (argE.isInvalid()) {
1625 Args[i] = argE.get();
1627 // Update the parameter type in-place.
1628 param->setType(paramType);
1633 QualType origParamType = param->getType();
1634 QualType paramType = param->getType();
1636 paramType = paramType.substObjCTypeArgs(
1639 ObjCSubstitutionContext::Parameter);
1641 if (RequireCompleteType(argExpr->getSourceRange().getBegin(),
1643 diag::err_call_incomplete_argument, argExpr))
1646 InitializedEntity Entity
1647 = InitializedEntity::InitializeParameter(Context, param, paramType);
1648 ExprResult ArgE = PerformCopyInitialization(Entity, SourceLocation(), argExpr);
1649 if (ArgE.isInvalid())
1652 Args[i] = ArgE.getAs<Expr>();
1654 // If we are type-erasing a block to a block-compatible
1655 // Objective-C pointer type, we may need to extend the lifetime
1656 // of the block object.
1657 if (typeArgs && Args[i]->isRValue() && paramType->isBlockPointerType() &&
1658 Args[i]->getType()->isBlockPointerType() &&
1659 origParamType->isObjCObjectPointerType()) {
1660 ExprResult arg = Args[i];
1661 maybeExtendBlockObject(arg);
1662 Args[i] = arg.get();
1667 // Promote additional arguments to variadic methods.
1668 if (Method->isVariadic()) {
1669 for (unsigned i = NumNamedArgs, e = Args.size(); i < e; ++i) {
1670 if (Args[i]->isTypeDependent())
1673 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod,
1675 IsError |= Arg.isInvalid();
1676 Args[i] = Arg.get();
1679 // Check for extra arguments to non-variadic methods.
1680 if (Args.size() != NumNamedArgs) {
1681 Diag(Args[NumNamedArgs]->getLocStart(),
1682 diag::err_typecheck_call_too_many_args)
1683 << 2 /*method*/ << NumNamedArgs << static_cast<unsigned>(Args.size())
1684 << Method->getSourceRange()
1685 << SourceRange(Args[NumNamedArgs]->getLocStart(),
1686 Args.back()->getLocEnd());
1690 DiagnoseSentinelCalls(Method, SelLoc, Args);
1692 // Do additional checkings on method.
1693 IsError |= CheckObjCMethodCall(
1694 Method, SelLoc, makeArrayRef(Args.data(), Args.size()));
1699 bool Sema::isSelfExpr(Expr *RExpr) {
1700 // 'self' is objc 'self' in an objc method only.
1701 ObjCMethodDecl *Method =
1702 dyn_cast_or_null<ObjCMethodDecl>(CurContext->getNonClosureAncestor());
1703 return isSelfExpr(RExpr, Method);
1706 bool Sema::isSelfExpr(Expr *receiver, const ObjCMethodDecl *method) {
1707 if (!method) return false;
1709 receiver = receiver->IgnoreParenLValueCasts();
1710 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(receiver))
1711 if (DRE->getDecl() == method->getSelfDecl())
1716 /// LookupMethodInType - Look up a method in an ObjCObjectType.
1717 ObjCMethodDecl *Sema::LookupMethodInObjectType(Selector sel, QualType type,
1719 const ObjCObjectType *objType = type->castAs<ObjCObjectType>();
1720 if (ObjCInterfaceDecl *iface = objType->getInterface()) {
1721 // Look it up in the main interface (and categories, etc.)
1722 if (ObjCMethodDecl *method = iface->lookupMethod(sel, isInstance))
1725 // Okay, look for "private" methods declared in any
1726 // @implementations we've seen.
1727 if (ObjCMethodDecl *method = iface->lookupPrivateMethod(sel, isInstance))
1731 // Check qualifiers.
1732 for (const auto *I : objType->quals())
1733 if (ObjCMethodDecl *method = I->lookupMethod(sel, isInstance))
1739 /// LookupMethodInQualifiedType - Lookups up a method in protocol qualifier
1740 /// list of a qualified objective pointer type.
1741 ObjCMethodDecl *Sema::LookupMethodInQualifiedType(Selector Sel,
1742 const ObjCObjectPointerType *OPT,
1745 ObjCMethodDecl *MD = nullptr;
1746 for (const auto *PROTO : OPT->quals()) {
1747 if ((MD = PROTO->lookupMethod(Sel, Instance))) {
1754 /// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an
1755 /// objective C interface. This is a property reference expression.
1757 HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT,
1758 Expr *BaseExpr, SourceLocation OpLoc,
1759 DeclarationName MemberName,
1760 SourceLocation MemberLoc,
1761 SourceLocation SuperLoc, QualType SuperType,
1763 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType();
1764 ObjCInterfaceDecl *IFace = IFaceT->getDecl();
1766 if (!MemberName.isIdentifier()) {
1767 Diag(MemberLoc, diag::err_invalid_property_name)
1768 << MemberName << QualType(OPT, 0);
1772 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1774 SourceRange BaseRange = Super? SourceRange(SuperLoc)
1775 : BaseExpr->getSourceRange();
1776 if (RequireCompleteType(MemberLoc, OPT->getPointeeType(),
1777 diag::err_property_not_found_forward_class,
1778 MemberName, BaseRange))
1781 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Member)) {
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(Member)) {
1797 // Check whether we can reference this property.
1798 if (DiagnoseUseOfDecl(PD, MemberLoc))
1802 return new (Context) ObjCPropertyRefExpr(
1803 PD, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty, MemberLoc,
1804 SuperLoc, SuperType);
1806 return new (Context)
1807 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1808 OK_ObjCProperty, MemberLoc, BaseExpr);
1810 // If that failed, look for an "implicit" property by seeing if the nullary
1811 // selector is implemented.
1813 // FIXME: The logic for looking up nullary and unary selectors should be
1814 // shared with the code in ActOnInstanceMessage.
1816 Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
1817 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
1819 // May be founf in property's qualified list.
1821 Getter = LookupMethodInQualifiedType(Sel, OPT, true);
1823 // If this reference is in an @implementation, check for 'private' methods.
1825 Getter = IFace->lookupPrivateMethod(Sel);
1828 // Check if we can reference this property.
1829 if (DiagnoseUseOfDecl(Getter, MemberLoc))
1832 // If we found a getter then this may be a valid dot-reference, we
1833 // will look for the matching setter, in case it is needed.
1834 Selector SetterSel =
1835 SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
1836 PP.getSelectorTable(), Member);
1837 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel);
1839 // May be founf in property's qualified list.
1841 Setter = LookupMethodInQualifiedType(SetterSel, OPT, true);
1844 // If this reference is in an @implementation, also check for 'private'
1846 Setter = IFace->lookupPrivateMethod(SetterSel);
1849 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
1852 // Special warning if member name used in a property-dot for a setter accessor
1853 // does not use a property with same name; e.g. obj.X = ... for a property with
1855 if (Setter && Setter->isImplicit() && Setter->isPropertyAccessor()
1856 && !IFace->FindPropertyDeclaration(Member)) {
1857 if (const ObjCPropertyDecl *PDecl = Setter->findPropertyDecl()) {
1858 // Do not warn if user is using property-dot syntax to make call to
1859 // user named setter.
1860 if (!(PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter))
1862 diag::warn_property_access_suggest)
1863 << MemberName << QualType(OPT, 0) << PDecl->getName()
1864 << FixItHint::CreateReplacement(MemberLoc, PDecl->getName());
1868 if (Getter || Setter) {
1870 return new (Context)
1871 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1872 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1874 return new (Context)
1875 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1876 OK_ObjCProperty, MemberLoc, BaseExpr);
1880 // Attempt to correct for typos in property names.
1881 if (TypoCorrection Corrected =
1882 CorrectTypo(DeclarationNameInfo(MemberName, MemberLoc),
1883 LookupOrdinaryName, nullptr, nullptr,
1884 llvm::make_unique<DeclFilterCCC<ObjCPropertyDecl>>(),
1885 CTK_ErrorRecovery, IFace, false, OPT)) {
1886 diagnoseTypo(Corrected, PDiag(diag::err_property_not_found_suggest)
1887 << MemberName << QualType(OPT, 0));
1888 DeclarationName TypoResult = Corrected.getCorrection();
1889 return HandleExprPropertyRefExpr(OPT, BaseExpr, OpLoc,
1890 TypoResult, MemberLoc,
1891 SuperLoc, SuperType, Super);
1893 ObjCInterfaceDecl *ClassDeclared;
1894 if (ObjCIvarDecl *Ivar =
1895 IFace->lookupInstanceVariable(Member, ClassDeclared)) {
1896 QualType T = Ivar->getType();
1897 if (const ObjCObjectPointerType * OBJPT =
1898 T->getAsObjCInterfacePointerType()) {
1899 if (RequireCompleteType(MemberLoc, OBJPT->getPointeeType(),
1900 diag::err_property_not_as_forward_class,
1901 MemberName, BaseExpr))
1905 diag::err_ivar_access_using_property_syntax_suggest)
1906 << MemberName << QualType(OPT, 0) << Ivar->getDeclName()
1907 << FixItHint::CreateReplacement(OpLoc, "->");
1911 Diag(MemberLoc, diag::err_property_not_found)
1912 << MemberName << QualType(OPT, 0);
1914 Diag(Setter->getLocation(), diag::note_getter_unavailable)
1915 << MemberName << BaseExpr->getSourceRange();
1922 ActOnClassPropertyRefExpr(IdentifierInfo &receiverName,
1923 IdentifierInfo &propertyName,
1924 SourceLocation receiverNameLoc,
1925 SourceLocation propertyNameLoc) {
1927 IdentifierInfo *receiverNamePtr = &receiverName;
1928 ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr,
1933 // If the "receiver" is 'super' in a method, handle it as an expression-like
1934 // property reference.
1935 if (receiverNamePtr->isStr("super")) {
1936 if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf(receiverNameLoc)) {
1937 if (auto classDecl = CurMethod->getClassInterface()) {
1938 SuperType = QualType(classDecl->getSuperClassType(), 0);
1939 if (CurMethod->isInstanceMethod()) {
1940 if (SuperType.isNull()) {
1941 // The current class does not have a superclass.
1942 Diag(receiverNameLoc, diag::error_root_class_cannot_use_super)
1943 << CurMethod->getClassInterface()->getIdentifier();
1946 QualType T = Context.getObjCObjectPointerType(SuperType);
1948 return HandleExprPropertyRefExpr(T->castAs<ObjCObjectPointerType>(),
1949 /*BaseExpr*/nullptr,
1950 SourceLocation()/*OpLoc*/,
1953 receiverNameLoc, T, true);
1956 // Otherwise, if this is a class method, try dispatching to our
1958 IFace = CurMethod->getClassInterface()->getSuperClass();
1964 Diag(receiverNameLoc, diag::err_expected_either) << tok::identifier
1970 // Search for a declared property first.
1971 Selector Sel = PP.getSelectorTable().getNullarySelector(&propertyName);
1972 ObjCMethodDecl *Getter = IFace->lookupClassMethod(Sel);
1974 // If this reference is in an @implementation, check for 'private' methods.
1976 Getter = IFace->lookupPrivateClassMethod(Sel);
1979 // FIXME: refactor/share with ActOnMemberReference().
1980 // Check if we can reference this property.
1981 if (DiagnoseUseOfDecl(Getter, propertyNameLoc))
1985 // Look for the matching setter, in case it is needed.
1986 Selector SetterSel =
1987 SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
1988 PP.getSelectorTable(),
1991 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
1993 // If this reference is in an @implementation, also check for 'private'
1995 Setter = IFace->lookupPrivateClassMethod(SetterSel);
1997 // Look through local category implementations associated with the class.
1999 Setter = IFace->getCategoryClassMethod(SetterSel);
2001 if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc))
2004 if (Getter || Setter) {
2005 if (!SuperType.isNull())
2006 return new (Context)
2007 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
2008 OK_ObjCProperty, propertyNameLoc, receiverNameLoc,
2011 return new (Context) ObjCPropertyRefExpr(
2012 Getter, Setter, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty,
2013 propertyNameLoc, receiverNameLoc, IFace);
2015 return ExprError(Diag(propertyNameLoc, diag::err_property_not_found)
2016 << &propertyName << Context.getObjCInterfaceType(IFace));
2021 class ObjCInterfaceOrSuperCCC : public CorrectionCandidateCallback {
2023 ObjCInterfaceOrSuperCCC(ObjCMethodDecl *Method) {
2024 // Determine whether "super" is acceptable in the current context.
2025 if (Method && Method->getClassInterface())
2026 WantObjCSuper = Method->getClassInterface()->getSuperClass();
2029 bool ValidateCandidate(const TypoCorrection &candidate) override {
2030 return candidate.getCorrectionDeclAs<ObjCInterfaceDecl>() ||
2031 candidate.isKeyword("super");
2037 Sema::ObjCMessageKind Sema::getObjCMessageKind(Scope *S,
2038 IdentifierInfo *Name,
2039 SourceLocation NameLoc,
2041 bool HasTrailingDot,
2042 ParsedType &ReceiverType) {
2043 ReceiverType = ParsedType();
2045 // If the identifier is "super" and there is no trailing dot, we're
2046 // messaging super. If the identifier is "super" and there is a
2047 // trailing dot, it's an instance message.
2048 if (IsSuper && S->isInObjcMethodScope())
2049 return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage;
2051 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
2052 LookupName(Result, S);
2054 switch (Result.getResultKind()) {
2055 case LookupResult::NotFound:
2056 // Normal name lookup didn't find anything. If we're in an
2057 // Objective-C method, look for ivars. If we find one, we're done!
2058 // FIXME: This is a hack. Ivar lookup should be part of normal
2060 if (ObjCMethodDecl *Method = getCurMethodDecl()) {
2061 if (!Method->getClassInterface()) {
2062 // Fall back: let the parser try to parse it as an instance message.
2063 return ObjCInstanceMessage;
2066 ObjCInterfaceDecl *ClassDeclared;
2067 if (Method->getClassInterface()->lookupInstanceVariable(Name,
2069 return ObjCInstanceMessage;
2072 // Break out; we'll perform typo correction below.
2075 case LookupResult::NotFoundInCurrentInstantiation:
2076 case LookupResult::FoundOverloaded:
2077 case LookupResult::FoundUnresolvedValue:
2078 case LookupResult::Ambiguous:
2079 Result.suppressDiagnostics();
2080 return ObjCInstanceMessage;
2082 case LookupResult::Found: {
2083 // If the identifier is a class or not, and there is a trailing dot,
2084 // it's an instance message.
2086 return ObjCInstanceMessage;
2087 // We found something. If it's a type, then we have a class
2088 // message. Otherwise, it's an instance message.
2089 NamedDecl *ND = Result.getFoundDecl();
2091 if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND))
2092 T = Context.getObjCInterfaceType(Class);
2093 else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND)) {
2094 T = Context.getTypeDeclType(Type);
2095 DiagnoseUseOfDecl(Type, NameLoc);
2098 return ObjCInstanceMessage;
2100 // We have a class message, and T is the type we're
2101 // messaging. Build source-location information for it.
2102 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2103 ReceiverType = CreateParsedType(T, TSInfo);
2104 return ObjCClassMessage;
2108 if (TypoCorrection Corrected = CorrectTypo(
2109 Result.getLookupNameInfo(), Result.getLookupKind(), S, nullptr,
2110 llvm::make_unique<ObjCInterfaceOrSuperCCC>(getCurMethodDecl()),
2111 CTK_ErrorRecovery, nullptr, false, nullptr, false)) {
2112 if (Corrected.isKeyword()) {
2113 // If we've found the keyword "super" (the only keyword that would be
2114 // returned by CorrectTypo), this is a send to super.
2115 diagnoseTypo(Corrected,
2116 PDiag(diag::err_unknown_receiver_suggest) << Name);
2117 return ObjCSuperMessage;
2118 } else if (ObjCInterfaceDecl *Class =
2119 Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>()) {
2120 // If we found a declaration, correct when it refers to an Objective-C
2122 diagnoseTypo(Corrected,
2123 PDiag(diag::err_unknown_receiver_suggest) << Name);
2124 QualType T = Context.getObjCInterfaceType(Class);
2125 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2126 ReceiverType = CreateParsedType(T, TSInfo);
2127 return ObjCClassMessage;
2131 // Fall back: let the parser try to parse it as an instance message.
2132 return ObjCInstanceMessage;
2135 ExprResult Sema::ActOnSuperMessage(Scope *S,
2136 SourceLocation SuperLoc,
2138 SourceLocation LBracLoc,
2139 ArrayRef<SourceLocation> SelectorLocs,
2140 SourceLocation RBracLoc,
2141 MultiExprArg Args) {
2142 // Determine whether we are inside a method or not.
2143 ObjCMethodDecl *Method = tryCaptureObjCSelf(SuperLoc);
2145 Diag(SuperLoc, diag::err_invalid_receiver_to_message_super);
2149 ObjCInterfaceDecl *Class = Method->getClassInterface();
2151 Diag(SuperLoc, diag::error_no_super_class_message)
2152 << Method->getDeclName();
2156 QualType SuperTy(Class->getSuperClassType(), 0);
2157 if (SuperTy.isNull()) {
2158 // The current class does not have a superclass.
2159 Diag(SuperLoc, diag::error_root_class_cannot_use_super)
2160 << Class->getIdentifier();
2164 // We are in a method whose class has a superclass, so 'super'
2165 // is acting as a keyword.
2166 if (Method->getSelector() == Sel)
2167 getCurFunction()->ObjCShouldCallSuper = false;
2169 if (Method->isInstanceMethod()) {
2170 // Since we are in an instance method, this is an instance
2171 // message to the superclass instance.
2172 SuperTy = Context.getObjCObjectPointerType(SuperTy);
2173 return BuildInstanceMessage(nullptr, SuperTy, SuperLoc,
2174 Sel, /*Method=*/nullptr,
2175 LBracLoc, SelectorLocs, RBracLoc, Args);
2178 // Since we are in a class method, this is a class message to
2180 return BuildClassMessage(/*ReceiverTypeInfo=*/nullptr,
2182 SuperLoc, Sel, /*Method=*/nullptr,
2183 LBracLoc, SelectorLocs, RBracLoc, Args);
2187 ExprResult Sema::BuildClassMessageImplicit(QualType ReceiverType,
2188 bool isSuperReceiver,
2191 ObjCMethodDecl *Method,
2192 MultiExprArg Args) {
2193 TypeSourceInfo *receiverTypeInfo = nullptr;
2194 if (!ReceiverType.isNull())
2195 receiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType);
2197 return BuildClassMessage(receiverTypeInfo, ReceiverType,
2198 /*SuperLoc=*/isSuperReceiver ? Loc : SourceLocation(),
2199 Sel, Method, Loc, Loc, Loc, Args,
2200 /*isImplicit=*/true);
2204 static void applyCocoaAPICheck(Sema &S, const ObjCMessageExpr *Msg,
2206 bool (*refactor)(const ObjCMessageExpr *,
2207 const NSAPI &, edit::Commit &)) {
2208 SourceLocation MsgLoc = Msg->getExprLoc();
2209 if (S.Diags.isIgnored(DiagID, MsgLoc))
2212 SourceManager &SM = S.SourceMgr;
2213 edit::Commit ECommit(SM, S.LangOpts);
2214 if (refactor(Msg,*S.NSAPIObj, ECommit)) {
2215 DiagnosticBuilder Builder = S.Diag(MsgLoc, DiagID)
2216 << Msg->getSelector() << Msg->getSourceRange();
2217 // FIXME: Don't emit diagnostic at all if fixits are non-commitable.
2218 if (!ECommit.isCommitable())
2220 for (edit::Commit::edit_iterator
2221 I = ECommit.edit_begin(), E = ECommit.edit_end(); I != E; ++I) {
2222 const edit::Commit::Edit &Edit = *I;
2223 switch (Edit.Kind) {
2224 case edit::Commit::Act_Insert:
2225 Builder.AddFixItHint(FixItHint::CreateInsertion(Edit.OrigLoc,
2229 case edit::Commit::Act_InsertFromRange:
2230 Builder.AddFixItHint(
2231 FixItHint::CreateInsertionFromRange(Edit.OrigLoc,
2232 Edit.getInsertFromRange(SM),
2235 case edit::Commit::Act_Remove:
2236 Builder.AddFixItHint(FixItHint::CreateRemoval(Edit.getFileRange(SM)));
2243 static void checkCocoaAPI(Sema &S, const ObjCMessageExpr *Msg) {
2244 applyCocoaAPICheck(S, Msg, diag::warn_objc_redundant_literal_use,
2245 edit::rewriteObjCRedundantCallWithLiteral);
2248 /// \brief Diagnose use of %s directive in an NSString which is being passed
2249 /// as formatting string to formatting method.
2251 DiagnoseCStringFormatDirectiveInObjCAPI(Sema &S,
2252 ObjCMethodDecl *Method,
2254 Expr **Args, unsigned NumArgs) {
2256 bool Format = false;
2257 ObjCStringFormatFamily SFFamily = Sel.getStringFormatFamily();
2258 if (SFFamily == ObjCStringFormatFamily::SFF_NSString) {
2263 for (const auto *I : Method->specific_attrs<FormatAttr>()) {
2264 if (S.GetFormatNSStringIdx(I, Idx)) {
2270 if (!Format || NumArgs <= Idx)
2273 Expr *FormatExpr = Args[Idx];
2274 if (ObjCStringLiteral *OSL =
2275 dyn_cast<ObjCStringLiteral>(FormatExpr->IgnoreParenImpCasts())) {
2276 StringLiteral *FormatString = OSL->getString();
2277 if (S.FormatStringHasSArg(FormatString)) {
2278 S.Diag(FormatExpr->getExprLoc(), diag::warn_objc_cdirective_format_string)
2281 S.Diag(Method->getLocation(), diag::note_method_declared_at)
2282 << Method->getDeclName();
2287 /// \brief Build an Objective-C class message expression.
2289 /// This routine takes care of both normal class messages and
2290 /// class messages to the superclass.
2292 /// \param ReceiverTypeInfo Type source information that describes the
2293 /// receiver of this message. This may be NULL, in which case we are
2294 /// sending to the superclass and \p SuperLoc must be a valid source
2297 /// \param ReceiverType The type of the object receiving the
2298 /// message. When \p ReceiverTypeInfo is non-NULL, this is the same
2299 /// type as that refers to. For a superclass send, this is the type of
2302 /// \param SuperLoc The location of the "super" keyword in a
2303 /// superclass message.
2305 /// \param Sel The selector to which the message is being sent.
2307 /// \param Method The method that this class message is invoking, if
2310 /// \param LBracLoc The location of the opening square bracket ']'.
2312 /// \param RBracLoc The location of the closing square bracket ']'.
2314 /// \param ArgsIn The message arguments.
2315 ExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo,
2316 QualType ReceiverType,
2317 SourceLocation SuperLoc,
2319 ObjCMethodDecl *Method,
2320 SourceLocation LBracLoc,
2321 ArrayRef<SourceLocation> SelectorLocs,
2322 SourceLocation RBracLoc,
2323 MultiExprArg ArgsIn,
2325 SourceLocation Loc = SuperLoc.isValid()? SuperLoc
2326 : ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin();
2327 if (LBracLoc.isInvalid()) {
2328 Diag(Loc, diag::err_missing_open_square_message_send)
2329 << FixItHint::CreateInsertion(Loc, "[");
2332 SourceLocation SelLoc;
2333 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2334 SelLoc = SelectorLocs.front();
2338 if (ReceiverType->isDependentType()) {
2339 // If the receiver type is dependent, we can't type-check anything
2340 // at this point. Build a dependent expression.
2341 unsigned NumArgs = ArgsIn.size();
2342 Expr **Args = ArgsIn.data();
2343 assert(SuperLoc.isInvalid() && "Message to super with dependent type");
2344 return ObjCMessageExpr::Create(
2345 Context, ReceiverType, VK_RValue, LBracLoc, ReceiverTypeInfo, Sel,
2346 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs), RBracLoc,
2350 // Find the class to which we are sending this message.
2351 ObjCInterfaceDecl *Class = nullptr;
2352 const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>();
2353 if (!ClassType || !(Class = ClassType->getInterface())) {
2354 Diag(Loc, diag::err_invalid_receiver_class_message)
2358 assert(Class && "We don't know which class we're messaging?");
2359 // objc++ diagnoses during typename annotation.
2360 if (!getLangOpts().CPlusPlus)
2361 (void)DiagnoseUseOfDecl(Class, SelLoc);
2362 // Find the method we are messaging.
2364 SourceRange TypeRange
2365 = SuperLoc.isValid()? SourceRange(SuperLoc)
2366 : ReceiverTypeInfo->getTypeLoc().getSourceRange();
2367 if (RequireCompleteType(Loc, Context.getObjCInterfaceType(Class),
2368 (getLangOpts().ObjCAutoRefCount
2369 ? diag::err_arc_receiver_forward_class
2370 : diag::warn_receiver_forward_class),
2372 // A forward class used in messaging is treated as a 'Class'
2373 Method = LookupFactoryMethodInGlobalPool(Sel,
2374 SourceRange(LBracLoc, RBracLoc));
2375 if (Method && !getLangOpts().ObjCAutoRefCount)
2376 Diag(Method->getLocation(), diag::note_method_sent_forward_class)
2377 << Method->getDeclName();
2380 Method = Class->lookupClassMethod(Sel);
2382 // If we have an implementation in scope, check "private" methods.
2384 Method = Class->lookupPrivateClassMethod(Sel);
2386 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2390 // Check the argument types and determine the result type.
2391 QualType ReturnType;
2392 ExprValueKind VK = VK_RValue;
2394 unsigned NumArgs = ArgsIn.size();
2395 Expr **Args = ArgsIn.data();
2396 if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2399 SuperLoc.isValid(), LBracLoc, RBracLoc,
2404 if (Method && !Method->getReturnType()->isVoidType() &&
2405 RequireCompleteType(LBracLoc, Method->getReturnType(),
2406 diag::err_illegal_message_expr_incomplete_type))
2409 // Warn about explicit call of +initialize on its own class. But not on 'super'.
2410 if (Method && Method->getMethodFamily() == OMF_initialize) {
2411 if (!SuperLoc.isValid()) {
2412 const ObjCInterfaceDecl *ID =
2413 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext());
2415 Diag(Loc, diag::warn_direct_initialize_call);
2416 Diag(Method->getLocation(), diag::note_method_declared_at)
2417 << Method->getDeclName();
2420 else if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2421 // [super initialize] is allowed only within an +initialize implementation
2422 if (CurMeth->getMethodFamily() != OMF_initialize) {
2423 Diag(Loc, diag::warn_direct_super_initialize_call);
2424 Diag(Method->getLocation(), diag::note_method_declared_at)
2425 << Method->getDeclName();
2426 Diag(CurMeth->getLocation(), diag::note_method_declared_at)
2427 << CurMeth->getDeclName();
2432 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
2434 // Construct the appropriate ObjCMessageExpr.
2435 ObjCMessageExpr *Result;
2436 if (SuperLoc.isValid())
2437 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2438 SuperLoc, /*IsInstanceSuper=*/false,
2439 ReceiverType, Sel, SelectorLocs,
2440 Method, makeArrayRef(Args, NumArgs),
2441 RBracLoc, isImplicit);
2443 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2444 ReceiverTypeInfo, Sel, SelectorLocs,
2445 Method, makeArrayRef(Args, NumArgs),
2446 RBracLoc, isImplicit);
2448 checkCocoaAPI(*this, Result);
2450 return MaybeBindToTemporary(Result);
2453 // ActOnClassMessage - used for both unary and keyword messages.
2454 // ArgExprs is optional - if it is present, the number of expressions
2455 // is obtained from Sel.getNumArgs().
2456 ExprResult Sema::ActOnClassMessage(Scope *S,
2457 ParsedType Receiver,
2459 SourceLocation LBracLoc,
2460 ArrayRef<SourceLocation> SelectorLocs,
2461 SourceLocation RBracLoc,
2462 MultiExprArg Args) {
2463 TypeSourceInfo *ReceiverTypeInfo;
2464 QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo);
2465 if (ReceiverType.isNull())
2469 if (!ReceiverTypeInfo)
2470 ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc);
2472 return BuildClassMessage(ReceiverTypeInfo, ReceiverType,
2473 /*SuperLoc=*/SourceLocation(), Sel,
2474 /*Method=*/nullptr, LBracLoc, SelectorLocs, RBracLoc,
2478 ExprResult Sema::BuildInstanceMessageImplicit(Expr *Receiver,
2479 QualType ReceiverType,
2482 ObjCMethodDecl *Method,
2483 MultiExprArg Args) {
2484 return BuildInstanceMessage(Receiver, ReceiverType,
2485 /*SuperLoc=*/!Receiver ? Loc : SourceLocation(),
2486 Sel, Method, Loc, Loc, Loc, Args,
2487 /*isImplicit=*/true);
2490 /// \brief Build an Objective-C instance message expression.
2492 /// This routine takes care of both normal instance messages and
2493 /// instance messages to the superclass instance.
2495 /// \param Receiver The expression that computes the object that will
2496 /// receive this message. This may be empty, in which case we are
2497 /// sending to the superclass instance and \p SuperLoc must be a valid
2498 /// source location.
2500 /// \param ReceiverType The (static) type of the object receiving the
2501 /// message. When a \p Receiver expression is provided, this is the
2502 /// same type as that expression. For a superclass instance send, this
2503 /// is a pointer to the type of the superclass.
2505 /// \param SuperLoc The location of the "super" keyword in a
2506 /// superclass instance message.
2508 /// \param Sel The selector to which the message is being sent.
2510 /// \param Method The method that this instance message is invoking, if
2513 /// \param LBracLoc The location of the opening square bracket ']'.
2515 /// \param RBracLoc The location of the closing square bracket ']'.
2517 /// \param ArgsIn The message arguments.
2518 ExprResult Sema::BuildInstanceMessage(Expr *Receiver,
2519 QualType ReceiverType,
2520 SourceLocation SuperLoc,
2522 ObjCMethodDecl *Method,
2523 SourceLocation LBracLoc,
2524 ArrayRef<SourceLocation> SelectorLocs,
2525 SourceLocation RBracLoc,
2526 MultiExprArg ArgsIn,
2528 // The location of the receiver.
2529 SourceLocation Loc = SuperLoc.isValid()? SuperLoc : Receiver->getLocStart();
2530 SourceRange RecRange =
2531 SuperLoc.isValid()? SuperLoc : Receiver->getSourceRange();
2532 SourceLocation SelLoc;
2533 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2534 SelLoc = SelectorLocs.front();
2538 if (LBracLoc.isInvalid()) {
2539 Diag(Loc, diag::err_missing_open_square_message_send)
2540 << FixItHint::CreateInsertion(Loc, "[");
2544 // If we have a receiver expression, perform appropriate promotions
2545 // and determine receiver type.
2547 if (Receiver->hasPlaceholderType()) {
2549 if (Receiver->getType() == Context.UnknownAnyTy)
2550 Result = forceUnknownAnyToType(Receiver, Context.getObjCIdType());
2552 Result = CheckPlaceholderExpr(Receiver);
2553 if (Result.isInvalid()) return ExprError();
2554 Receiver = Result.get();
2557 if (Receiver->isTypeDependent()) {
2558 // If the receiver is type-dependent, we can't type-check anything
2559 // at this point. Build a dependent expression.
2560 unsigned NumArgs = ArgsIn.size();
2561 Expr **Args = ArgsIn.data();
2562 assert(SuperLoc.isInvalid() && "Message to super with dependent type");
2563 return ObjCMessageExpr::Create(
2564 Context, Context.DependentTy, VK_RValue, LBracLoc, Receiver, Sel,
2565 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs),
2566 RBracLoc, isImplicit);
2569 // If necessary, apply function/array conversion to the receiver.
2570 // C99 6.7.5.3p[7,8].
2571 ExprResult Result = DefaultFunctionArrayLvalueConversion(Receiver);
2572 if (Result.isInvalid())
2574 Receiver = Result.get();
2575 ReceiverType = Receiver->getType();
2577 // If the receiver is an ObjC pointer, a block pointer, or an
2578 // __attribute__((NSObject)) pointer, we don't need to do any
2579 // special conversion in order to look up a receiver.
2580 if (ReceiverType->isObjCRetainableType()) {
2582 } else if (!getLangOpts().ObjCAutoRefCount &&
2583 !Context.getObjCIdType().isNull() &&
2584 (ReceiverType->isPointerType() ||
2585 ReceiverType->isIntegerType())) {
2586 // Implicitly convert integers and pointers to 'id' but emit a warning.
2588 Diag(Loc, diag::warn_bad_receiver_type)
2590 << Receiver->getSourceRange();
2591 if (ReceiverType->isPointerType()) {
2592 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2593 CK_CPointerToObjCPointerCast).get();
2595 // TODO: specialized warning on null receivers?
2596 bool IsNull = Receiver->isNullPointerConstant(Context,
2597 Expr::NPC_ValueDependentIsNull);
2598 CastKind Kind = IsNull ? CK_NullToPointer : CK_IntegralToPointer;
2599 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2602 ReceiverType = Receiver->getType();
2603 } else if (getLangOpts().CPlusPlus) {
2604 // The receiver must be a complete type.
2605 if (RequireCompleteType(Loc, Receiver->getType(),
2606 diag::err_incomplete_receiver_type))
2609 ExprResult result = PerformContextuallyConvertToObjCPointer(Receiver);
2610 if (result.isUsable()) {
2611 Receiver = result.get();
2612 ReceiverType = Receiver->getType();
2617 // There's a somewhat weird interaction here where we assume that we
2618 // won't actually have a method unless we also don't need to do some
2619 // of the more detailed type-checking on the receiver.
2622 // Handle messages to id and __kindof types (where we use the
2623 // global method pool).
2624 // FIXME: The type bound is currently ignored by lookup in the
2626 const ObjCObjectType *typeBound = nullptr;
2627 bool receiverIsIdLike = ReceiverType->isObjCIdOrObjectKindOfType(Context,
2629 if (receiverIsIdLike || ReceiverType->isBlockPointerType() ||
2630 (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) {
2631 Method = LookupInstanceMethodInGlobalPool(Sel,
2632 SourceRange(LBracLoc, RBracLoc),
2635 Method = LookupFactoryMethodInGlobalPool(Sel,
2636 SourceRange(LBracLoc,RBracLoc),
2639 if (ObjCMethodDecl *BestMethod =
2640 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod()))
2641 Method = BestMethod;
2642 if (!AreMultipleMethodsInGlobalPool(Sel, Method,
2643 SourceRange(LBracLoc, RBracLoc),
2644 receiverIsIdLike)) {
2645 DiagnoseUseOfDecl(Method, SelLoc);
2648 } else if (ReceiverType->isObjCClassOrClassKindOfType() ||
2649 ReceiverType->isObjCQualifiedClassType()) {
2650 // Handle messages to Class.
2651 // We allow sending a message to a qualified Class ("Class<foo>"), which
2652 // is ok as long as one of the protocols implements the selector (if not,
2654 if (!ReceiverType->isObjCClassOrClassKindOfType()) {
2655 const ObjCObjectPointerType *QClassTy
2656 = ReceiverType->getAsObjCQualifiedClassType();
2657 // Search protocols for class methods.
2658 Method = LookupMethodInQualifiedType(Sel, QClassTy, false);
2660 Method = LookupMethodInQualifiedType(Sel, QClassTy, true);
2661 // warn if instance method found for a Class message.
2663 Diag(SelLoc, diag::warn_instance_method_on_class_found)
2664 << Method->getSelector() << Sel;
2665 Diag(Method->getLocation(), diag::note_method_declared_at)
2666 << Method->getDeclName();
2670 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2671 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) {
2672 // First check the public methods in the class interface.
2673 Method = ClassDecl->lookupClassMethod(Sel);
2676 Method = ClassDecl->lookupPrivateClassMethod(Sel);
2678 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2682 // If not messaging 'self', look for any factory method named 'Sel'.
2683 if (!Receiver || !isSelfExpr(Receiver)) {
2684 Method = LookupFactoryMethodInGlobalPool(Sel,
2685 SourceRange(LBracLoc, RBracLoc));
2687 // If no class (factory) method was found, check if an _instance_
2688 // method of the same name exists in the root class only.
2689 Method = LookupInstanceMethodInGlobalPool(Sel,
2690 SourceRange(LBracLoc, RBracLoc));
2692 if (const ObjCInterfaceDecl *ID =
2693 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) {
2694 if (ID->getSuperClass())
2695 Diag(SelLoc, diag::warn_root_inst_method_not_found)
2696 << Sel << SourceRange(LBracLoc, RBracLoc);
2700 if (ObjCMethodDecl *BestMethod =
2701 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod()))
2702 Method = BestMethod;
2707 ObjCInterfaceDecl *ClassDecl = nullptr;
2709 // We allow sending a message to a qualified ID ("id<foo>"), which is ok as
2710 // long as one of the protocols implements the selector (if not, warn).
2711 // And as long as message is not deprecated/unavailable (warn if it is).
2712 if (const ObjCObjectPointerType *QIdTy
2713 = ReceiverType->getAsObjCQualifiedIdType()) {
2714 // Search protocols for instance methods.
2715 Method = LookupMethodInQualifiedType(Sel, QIdTy, true);
2717 Method = LookupMethodInQualifiedType(Sel, QIdTy, false);
2718 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2720 } else if (const ObjCObjectPointerType *OCIType
2721 = ReceiverType->getAsObjCInterfacePointerType()) {
2722 // We allow sending a message to a pointer to an interface (an object).
2723 ClassDecl = OCIType->getInterfaceDecl();
2725 // Try to complete the type. Under ARC, this is a hard error from which
2726 // we don't try to recover.
2727 // FIXME: In the non-ARC case, this will still be a hard error if the
2728 // definition is found in a module that's not visible.
2729 const ObjCInterfaceDecl *forwardClass = nullptr;
2730 if (RequireCompleteType(Loc, OCIType->getPointeeType(),
2731 getLangOpts().ObjCAutoRefCount
2732 ? diag::err_arc_receiver_forward_instance
2733 : diag::warn_receiver_forward_instance,
2734 Receiver? Receiver->getSourceRange()
2735 : SourceRange(SuperLoc))) {
2736 if (getLangOpts().ObjCAutoRefCount)
2739 forwardClass = OCIType->getInterfaceDecl();
2740 Diag(Receiver ? Receiver->getLocStart()
2741 : SuperLoc, diag::note_receiver_is_id);
2744 Method = ClassDecl->lookupInstanceMethod(Sel);
2748 // Search protocol qualifiers.
2749 Method = LookupMethodInQualifiedType(Sel, OCIType, true);
2752 // If we have implementations in scope, check "private" methods.
2753 Method = ClassDecl->lookupPrivateMethod(Sel);
2755 if (!Method && getLangOpts().ObjCAutoRefCount) {
2756 Diag(SelLoc, diag::err_arc_may_not_respond)
2757 << OCIType->getPointeeType() << Sel << RecRange
2758 << SourceRange(SelectorLocs.front(), SelectorLocs.back());
2762 if (!Method && (!Receiver || !isSelfExpr(Receiver))) {
2763 // If we still haven't found a method, look in the global pool. This
2764 // behavior isn't very desirable, however we need it for GCC
2765 // compatibility. FIXME: should we deviate??
2766 if (OCIType->qual_empty()) {
2767 Method = LookupInstanceMethodInGlobalPool(Sel,
2768 SourceRange(LBracLoc, RBracLoc));
2770 if (auto BestMethod =
2771 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod()))
2772 Method = BestMethod;
2773 AreMultipleMethodsInGlobalPool(Sel, Method,
2774 SourceRange(LBracLoc, RBracLoc),
2777 if (Method && !forwardClass)
2778 Diag(SelLoc, diag::warn_maynot_respond)
2779 << OCIType->getInterfaceDecl()->getIdentifier()
2784 if (Method && DiagnoseUseOfDecl(Method, SelLoc, forwardClass))
2787 // Reject other random receiver types (e.g. structs).
2788 Diag(Loc, diag::err_bad_receiver_type)
2789 << ReceiverType << Receiver->getSourceRange();
2795 FunctionScopeInfo *DIFunctionScopeInfo =
2796 (Method && Method->getMethodFamily() == OMF_init)
2797 ? getEnclosingFunction() : nullptr;
2799 if (DIFunctionScopeInfo &&
2800 DIFunctionScopeInfo->ObjCIsDesignatedInit &&
2801 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2802 bool isDesignatedInitChain = false;
2803 if (SuperLoc.isValid()) {
2804 if (const ObjCObjectPointerType *
2805 OCIType = ReceiverType->getAsObjCInterfacePointerType()) {
2806 if (const ObjCInterfaceDecl *ID = OCIType->getInterfaceDecl()) {
2807 // Either we know this is a designated initializer or we
2808 // conservatively assume it because we don't know for sure.
2809 if (!ID->declaresOrInheritsDesignatedInitializers() ||
2810 ID->isDesignatedInitializer(Sel)) {
2811 isDesignatedInitChain = true;
2812 DIFunctionScopeInfo->ObjCWarnForNoDesignatedInitChain = false;
2817 if (!isDesignatedInitChain) {
2818 const ObjCMethodDecl *InitMethod = nullptr;
2820 getCurMethodDecl()->isDesignatedInitializerForTheInterface(&InitMethod);
2821 assert(isDesignated && InitMethod);
2823 Diag(SelLoc, SuperLoc.isValid() ?
2824 diag::warn_objc_designated_init_non_designated_init_call :
2825 diag::warn_objc_designated_init_non_super_designated_init_call);
2826 Diag(InitMethod->getLocation(),
2827 diag::note_objc_designated_init_marked_here);
2831 if (DIFunctionScopeInfo &&
2832 DIFunctionScopeInfo->ObjCIsSecondaryInit &&
2833 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2834 if (SuperLoc.isValid()) {
2835 Diag(SelLoc, diag::warn_objc_secondary_init_super_init_call);
2837 DIFunctionScopeInfo->ObjCWarnForNoInitDelegation = false;
2841 // Check the message arguments.
2842 unsigned NumArgs = ArgsIn.size();
2843 Expr **Args = ArgsIn.data();
2844 QualType ReturnType;
2845 ExprValueKind VK = VK_RValue;
2846 bool ClassMessage = (ReceiverType->isObjCClassType() ||
2847 ReceiverType->isObjCQualifiedClassType());
2848 if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2849 Sel, SelectorLocs, Method,
2850 ClassMessage, SuperLoc.isValid(),
2851 LBracLoc, RBracLoc, RecRange, ReturnType, VK))
2854 if (Method && !Method->getReturnType()->isVoidType() &&
2855 RequireCompleteType(LBracLoc, Method->getReturnType(),
2856 diag::err_illegal_message_expr_incomplete_type))
2859 // In ARC, forbid the user from sending messages to
2860 // retain/release/autorelease/dealloc/retainCount explicitly.
2861 if (getLangOpts().ObjCAutoRefCount) {
2862 ObjCMethodFamily family =
2863 (Method ? Method->getMethodFamily() : Sel.getMethodFamily());
2867 checkInitMethod(Method, ReceiverType);
2873 case OMF_mutableCopy:
2876 case OMF_initialize:
2882 case OMF_autorelease:
2883 case OMF_retainCount:
2884 Diag(SelLoc, diag::err_arc_illegal_explicit_message)
2888 case OMF_performSelector:
2889 if (Method && NumArgs >= 1) {
2890 if (ObjCSelectorExpr *SelExp = dyn_cast<ObjCSelectorExpr>(Args[0])) {
2891 Selector ArgSel = SelExp->getSelector();
2892 ObjCMethodDecl *SelMethod =
2893 LookupInstanceMethodInGlobalPool(ArgSel,
2894 SelExp->getSourceRange());
2897 LookupFactoryMethodInGlobalPool(ArgSel,
2898 SelExp->getSourceRange());
2900 ObjCMethodFamily SelFamily = SelMethod->getMethodFamily();
2901 switch (SelFamily) {
2904 case OMF_mutableCopy:
2908 // Issue error, unless ns_returns_not_retained.
2909 if (!SelMethod->hasAttr<NSReturnsNotRetainedAttr>()) {
2910 // selector names a +1 method
2912 diag::err_arc_perform_selector_retains);
2913 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
2914 << SelMethod->getDeclName();
2918 // +0 call. OK. unless ns_returns_retained.
2919 if (SelMethod->hasAttr<NSReturnsRetainedAttr>()) {
2920 // selector names a +1 method
2922 diag::err_arc_perform_selector_retains);
2923 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
2924 << SelMethod->getDeclName();
2930 // error (may leak).
2931 Diag(SelLoc, diag::warn_arc_perform_selector_leaks);
2932 Diag(Args[0]->getExprLoc(), diag::note_used_here);
2939 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
2941 // Construct the appropriate ObjCMessageExpr instance.
2942 ObjCMessageExpr *Result;
2943 if (SuperLoc.isValid())
2944 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2945 SuperLoc, /*IsInstanceSuper=*/true,
2946 ReceiverType, Sel, SelectorLocs, Method,
2947 makeArrayRef(Args, NumArgs), RBracLoc,
2950 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2951 Receiver, Sel, SelectorLocs, Method,
2952 makeArrayRef(Args, NumArgs), RBracLoc,
2955 checkCocoaAPI(*this, Result);
2958 if (getLangOpts().ObjCAutoRefCount) {
2959 // In ARC, annotate delegate init calls.
2960 if (Result->getMethodFamily() == OMF_init &&
2961 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2962 // Only consider init calls *directly* in init implementations,
2963 // not within blocks.
2964 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(CurContext);
2965 if (method && method->getMethodFamily() == OMF_init) {
2966 // The implicit assignment to self means we also don't want to
2967 // consume the result.
2968 Result->setDelegateInitCall(true);
2973 // In ARC, check for message sends which are likely to introduce
2975 checkRetainCycles(Result);
2977 if (!isImplicit && Method) {
2978 if (const ObjCPropertyDecl *Prop = Method->findPropertyDecl()) {
2980 Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak;
2981 if (!IsWeak && Sel.isUnarySelector())
2982 IsWeak = ReturnType.getObjCLifetime() & Qualifiers::OCL_Weak;
2984 !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, LBracLoc))
2985 getCurFunction()->recordUseOfWeak(Result, Prop);
2990 CheckObjCCircularContainer(Result);
2992 return MaybeBindToTemporary(Result);
2995 static void RemoveSelectorFromWarningCache(Sema &S, Expr* Arg) {
2996 if (ObjCSelectorExpr *OSE =
2997 dyn_cast<ObjCSelectorExpr>(Arg->IgnoreParenCasts())) {
2998 Selector Sel = OSE->getSelector();
2999 SourceLocation Loc = OSE->getAtLoc();
3000 auto Pos = S.ReferencedSelectors.find(Sel);
3001 if (Pos != S.ReferencedSelectors.end() && Pos->second == Loc)
3002 S.ReferencedSelectors.erase(Pos);
3006 // ActOnInstanceMessage - used for both unary and keyword messages.
3007 // ArgExprs is optional - if it is present, the number of expressions
3008 // is obtained from Sel.getNumArgs().
3009 ExprResult Sema::ActOnInstanceMessage(Scope *S,
3012 SourceLocation LBracLoc,
3013 ArrayRef<SourceLocation> SelectorLocs,
3014 SourceLocation RBracLoc,
3015 MultiExprArg Args) {
3019 // A ParenListExpr can show up while doing error recovery with invalid code.
3020 if (isa<ParenListExpr>(Receiver)) {
3021 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Receiver);
3022 if (Result.isInvalid()) return ExprError();
3023 Receiver = Result.get();
3026 if (RespondsToSelectorSel.isNull()) {
3027 IdentifierInfo *SelectorId = &Context.Idents.get("respondsToSelector");
3028 RespondsToSelectorSel = Context.Selectors.getUnarySelector(SelectorId);
3030 if (Sel == RespondsToSelectorSel)
3031 RemoveSelectorFromWarningCache(*this, Args[0]);
3033 return BuildInstanceMessage(Receiver, Receiver->getType(),
3034 /*SuperLoc=*/SourceLocation(), Sel,
3035 /*Method=*/nullptr, LBracLoc, SelectorLocs,
3039 enum ARCConversionTypeClass {
3040 /// int, void, struct A
3046 /// id*, id***, void (^*)(),
3047 ACTC_indirectRetainable,
3049 /// void* might be a normal C type, or it might a CF type.
3055 static bool isAnyRetainable(ARCConversionTypeClass ACTC) {
3056 return (ACTC == ACTC_retainable ||
3057 ACTC == ACTC_coreFoundation ||
3058 ACTC == ACTC_voidPtr);
3060 static bool isAnyCLike(ARCConversionTypeClass ACTC) {
3061 return ACTC == ACTC_none ||
3062 ACTC == ACTC_voidPtr ||
3063 ACTC == ACTC_coreFoundation;
3066 static ARCConversionTypeClass classifyTypeForARCConversion(QualType type) {
3067 bool isIndirect = false;
3069 // Ignore an outermost reference type.
3070 if (const ReferenceType *ref = type->getAs<ReferenceType>()) {
3071 type = ref->getPointeeType();
3075 // Drill through pointers and arrays recursively.
3077 if (const PointerType *ptr = type->getAs<PointerType>()) {
3078 type = ptr->getPointeeType();
3080 // The first level of pointer may be the innermost pointer on a CF type.
3082 if (type->isVoidType()) return ACTC_voidPtr;
3083 if (type->isRecordType()) return ACTC_coreFoundation;
3085 } else if (const ArrayType *array = type->getAsArrayTypeUnsafe()) {
3086 type = QualType(array->getElementType()->getBaseElementTypeUnsafe(), 0);
3094 if (type->isObjCARCBridgableType())
3095 return ACTC_indirectRetainable;
3099 if (type->isObjCARCBridgableType())
3100 return ACTC_retainable;
3106 /// A result from the cast checker.
3108 /// Cannot be casted.
3111 /// Can be safely retained or not retained.
3114 /// Can be casted at +0.
3117 /// Can be casted at +1.
3120 ACCResult merge(ACCResult left, ACCResult right) {
3121 if (left == right) return left;
3122 if (left == ACC_bottom) return right;
3123 if (right == ACC_bottom) return left;
3127 /// A checker which white-lists certain expressions whose conversion
3128 /// to or from retainable type would otherwise be forbidden in ARC.
3129 class ARCCastChecker : public StmtVisitor<ARCCastChecker, ACCResult> {
3130 typedef StmtVisitor<ARCCastChecker, ACCResult> super;
3132 ASTContext &Context;
3133 ARCConversionTypeClass SourceClass;
3134 ARCConversionTypeClass TargetClass;
3137 static bool isCFType(QualType type) {
3138 // Someday this can use ns_bridged. For now, it has to do this.
3139 return type->isCARCBridgableType();
3143 ARCCastChecker(ASTContext &Context, ARCConversionTypeClass source,
3144 ARCConversionTypeClass target, bool diagnose)
3145 : Context(Context), SourceClass(source), TargetClass(target),
3146 Diagnose(diagnose) {}
3149 ACCResult Visit(Expr *e) {
3150 return super::Visit(e->IgnoreParens());
3153 ACCResult VisitStmt(Stmt *s) {
3157 /// Null pointer constants can be casted however you please.
3158 ACCResult VisitExpr(Expr *e) {
3159 if (e->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull))
3164 /// Objective-C string literals can be safely casted.
3165 ACCResult VisitObjCStringLiteral(ObjCStringLiteral *e) {
3166 // If we're casting to any retainable type, go ahead. Global
3167 // strings are immune to retains, so this is bottom.
3168 if (isAnyRetainable(TargetClass)) return ACC_bottom;
3173 /// Look through certain implicit and explicit casts.
3174 ACCResult VisitCastExpr(CastExpr *e) {
3175 switch (e->getCastKind()) {
3176 case CK_NullToPointer:
3180 case CK_LValueToRValue:
3182 case CK_CPointerToObjCPointerCast:
3183 case CK_BlockPointerToObjCPointerCast:
3184 case CK_AnyPointerToBlockPointerCast:
3185 return Visit(e->getSubExpr());
3192 /// Look through unary extension.
3193 ACCResult VisitUnaryExtension(UnaryOperator *e) {
3194 return Visit(e->getSubExpr());
3197 /// Ignore the LHS of a comma operator.
3198 ACCResult VisitBinComma(BinaryOperator *e) {
3199 return Visit(e->getRHS());
3202 /// Conditional operators are okay if both sides are okay.
3203 ACCResult VisitConditionalOperator(ConditionalOperator *e) {
3204 ACCResult left = Visit(e->getTrueExpr());
3205 if (left == ACC_invalid) return ACC_invalid;
3206 return merge(left, Visit(e->getFalseExpr()));
3209 /// Look through pseudo-objects.
3210 ACCResult VisitPseudoObjectExpr(PseudoObjectExpr *e) {
3211 // If we're getting here, we should always have a result.
3212 return Visit(e->getResultExpr());
3215 /// Statement expressions are okay if their result expression is okay.
3216 ACCResult VisitStmtExpr(StmtExpr *e) {
3217 return Visit(e->getSubStmt()->body_back());
3220 /// Some declaration references are okay.
3221 ACCResult VisitDeclRefExpr(DeclRefExpr *e) {
3222 VarDecl *var = dyn_cast<VarDecl>(e->getDecl());
3223 // References to global constants are okay.
3224 if (isAnyRetainable(TargetClass) &&
3225 isAnyRetainable(SourceClass) &&
3227 var->getStorageClass() == SC_Extern &&
3228 var->getType().isConstQualified()) {
3230 // In system headers, they can also be assumed to be immune to retains.
3231 // These are things like 'kCFStringTransformToLatin'.
3232 if (Context.getSourceManager().isInSystemHeader(var->getLocation()))
3235 return ACC_plusZero;
3242 /// Some calls are okay.
3243 ACCResult VisitCallExpr(CallExpr *e) {
3244 if (FunctionDecl *fn = e->getDirectCallee())
3245 if (ACCResult result = checkCallToFunction(fn))
3248 return super::VisitCallExpr(e);
3251 ACCResult checkCallToFunction(FunctionDecl *fn) {
3252 // Require a CF*Ref return type.
3253 if (!isCFType(fn->getReturnType()))
3256 if (!isAnyRetainable(TargetClass))
3259 // Honor an explicit 'not retained' attribute.
3260 if (fn->hasAttr<CFReturnsNotRetainedAttr>())
3261 return ACC_plusZero;
3263 // Honor an explicit 'retained' attribute, except that for
3264 // now we're not going to permit implicit handling of +1 results,
3265 // because it's a bit frightening.
3266 if (fn->hasAttr<CFReturnsRetainedAttr>())
3267 return Diagnose ? ACC_plusOne
3268 : ACC_invalid; // ACC_plusOne if we start accepting this
3270 // Recognize this specific builtin function, which is used by CFSTR.
3271 unsigned builtinID = fn->getBuiltinID();
3272 if (builtinID == Builtin::BI__builtin___CFStringMakeConstantString)
3275 // Otherwise, don't do anything implicit with an unaudited function.
3276 if (!fn->hasAttr<CFAuditedTransferAttr>())
3279 // Otherwise, it's +0 unless it follows the create convention.
3280 if (ento::coreFoundation::followsCreateRule(fn))
3281 return Diagnose ? ACC_plusOne
3282 : ACC_invalid; // ACC_plusOne if we start accepting this
3284 return ACC_plusZero;
3287 ACCResult VisitObjCMessageExpr(ObjCMessageExpr *e) {
3288 return checkCallToMethod(e->getMethodDecl());
3291 ACCResult VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *e) {
3292 ObjCMethodDecl *method;
3293 if (e->isExplicitProperty())
3294 method = e->getExplicitProperty()->getGetterMethodDecl();
3296 method = e->getImplicitPropertyGetter();
3297 return checkCallToMethod(method);
3300 ACCResult checkCallToMethod(ObjCMethodDecl *method) {
3301 if (!method) return ACC_invalid;
3303 // Check for message sends to functions returning CF types. We
3304 // just obey the Cocoa conventions with these, even though the
3305 // return type is CF.
3306 if (!isAnyRetainable(TargetClass) || !isCFType(method->getReturnType()))
3309 // If the method is explicitly marked not-retained, it's +0.
3310 if (method->hasAttr<CFReturnsNotRetainedAttr>())
3311 return ACC_plusZero;
3313 // If the method is explicitly marked as returning retained, or its
3314 // selector follows a +1 Cocoa convention, treat it as +1.
3315 if (method->hasAttr<CFReturnsRetainedAttr>())
3318 switch (method->getSelector().getMethodFamily()) {
3321 case OMF_mutableCopy:
3326 // Otherwise, treat it as +0.
3327 return ACC_plusZero;
3333 bool Sema::isKnownName(StringRef name) {
3336 LookupResult R(*this, &Context.Idents.get(name), SourceLocation(),
3337 Sema::LookupOrdinaryName);
3338 return LookupName(R, TUScope, false);
3341 static void addFixitForObjCARCConversion(Sema &S,
3342 DiagnosticBuilder &DiagB,
3343 Sema::CheckedConversionKind CCK,
3344 SourceLocation afterLParen,
3348 const char *bridgeKeyword,
3349 const char *CFBridgeName) {
3350 // We handle C-style and implicit casts here.
3352 case Sema::CCK_ImplicitConversion:
3353 case Sema::CCK_CStyleCast:
3354 case Sema::CCK_OtherCast:
3356 case Sema::CCK_FunctionalCast:
3361 if (CCK == Sema::CCK_OtherCast) {
3362 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3363 SourceRange range(NCE->getOperatorLoc(),
3364 NCE->getAngleBrackets().getEnd());
3365 SmallString<32> BridgeCall;
3367 SourceManager &SM = S.getSourceManager();
3368 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3369 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3372 BridgeCall += CFBridgeName;
3373 DiagB.AddFixItHint(FixItHint::CreateReplacement(range, BridgeCall));
3377 Expr *castedE = castExpr;
3378 if (CStyleCastExpr *CCE = dyn_cast<CStyleCastExpr>(castedE))
3379 castedE = CCE->getSubExpr();
3380 castedE = castedE->IgnoreImpCasts();
3381 SourceRange range = castedE->getSourceRange();
3383 SmallString<32> BridgeCall;
3385 SourceManager &SM = S.getSourceManager();
3386 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3387 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3390 BridgeCall += CFBridgeName;
3392 if (isa<ParenExpr>(castedE)) {
3393 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3397 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3399 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3400 S.getLocForEndOfToken(range.getEnd()),
3406 if (CCK == Sema::CCK_CStyleCast) {
3407 DiagB.AddFixItHint(FixItHint::CreateInsertion(afterLParen, bridgeKeyword));
3408 } else if (CCK == Sema::CCK_OtherCast) {
3409 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3410 std::string castCode = "(";
3411 castCode += bridgeKeyword;
3412 castCode += castType.getAsString();
3414 SourceRange Range(NCE->getOperatorLoc(),
3415 NCE->getAngleBrackets().getEnd());
3416 DiagB.AddFixItHint(FixItHint::CreateReplacement(Range, castCode));
3419 std::string castCode = "(";
3420 castCode += bridgeKeyword;
3421 castCode += castType.getAsString();
3423 Expr *castedE = castExpr->IgnoreImpCasts();
3424 SourceRange range = castedE->getSourceRange();
3425 if (isa<ParenExpr>(castedE)) {
3426 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3430 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3432 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3433 S.getLocForEndOfToken(range.getEnd()),
3439 template <typename T>
3440 static inline T *getObjCBridgeAttr(const TypedefType *TD) {
3441 TypedefNameDecl *TDNDecl = TD->getDecl();
3442 QualType QT = TDNDecl->getUnderlyingType();
3443 if (QT->isPointerType()) {
3444 QT = QT->getPointeeType();
3445 if (const RecordType *RT = QT->getAs<RecordType>())
3446 if (RecordDecl *RD = RT->getDecl()->getMostRecentDecl())
3447 return RD->getAttr<T>();
3452 static ObjCBridgeRelatedAttr *ObjCBridgeRelatedAttrFromType(QualType T,
3453 TypedefNameDecl *&TDNDecl) {
3454 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3455 TDNDecl = TD->getDecl();
3456 if (ObjCBridgeRelatedAttr *ObjCBAttr =
3457 getObjCBridgeAttr<ObjCBridgeRelatedAttr>(TD))
3459 T = TDNDecl->getUnderlyingType();
3465 diagnoseObjCARCConversion(Sema &S, SourceRange castRange,
3466 QualType castType, ARCConversionTypeClass castACTC,
3467 Expr *castExpr, Expr *realCast,
3468 ARCConversionTypeClass exprACTC,
3469 Sema::CheckedConversionKind CCK) {
3470 SourceLocation loc =
3471 (castRange.isValid() ? castRange.getBegin() : castExpr->getExprLoc());
3473 if (S.makeUnavailableInSystemHeader(loc,
3474 UnavailableAttr::IR_ARCForbiddenConversion))
3477 QualType castExprType = castExpr->getType();
3478 TypedefNameDecl *TDNDecl = nullptr;
3479 if ((castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable &&
3480 ObjCBridgeRelatedAttrFromType(castType, TDNDecl)) ||
3481 (exprACTC == ACTC_coreFoundation && castACTC == ACTC_retainable &&
3482 ObjCBridgeRelatedAttrFromType(castExprType, TDNDecl)))
3485 unsigned srcKind = 0;
3488 case ACTC_coreFoundation:
3490 srcKind = (castExprType->isPointerType() ? 1 : 0);
3492 case ACTC_retainable:
3493 srcKind = (castExprType->isBlockPointerType() ? 2 : 3);
3495 case ACTC_indirectRetainable:
3500 // Check whether this could be fixed with a bridge cast.
3501 SourceLocation afterLParen = S.getLocForEndOfToken(castRange.getBegin());
3502 SourceLocation noteLoc = afterLParen.isValid() ? afterLParen : loc;
3504 // Bridge from an ARC type to a CF type.
3505 if (castACTC == ACTC_retainable && isAnyRetainable(exprACTC)) {
3507 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3508 << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit
3509 << 2 // of C pointer type
3511 << unsigned(castType->isBlockPointerType()) // to ObjC|block type
3514 << castExpr->getSourceRange();
3515 bool br = S.isKnownName("CFBridgingRelease");
3516 ACCResult CreateRule =
3517 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3518 assert(CreateRule != ACC_bottom && "This cast should already be accepted.");
3519 if (CreateRule != ACC_plusOne)
3521 DiagnosticBuilder DiagB =
3522 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3523 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3525 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3526 castType, castExpr, realCast, "__bridge ",
3529 if (CreateRule != ACC_plusZero)
3531 DiagnosticBuilder DiagB =
3532 (CCK == Sema::CCK_OtherCast && !br) ?
3533 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_transfer) << castExprType :
3534 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3535 diag::note_arc_bridge_transfer)
3536 << castExprType << br;
3538 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3539 castType, castExpr, realCast, "__bridge_transfer ",
3540 br ? "CFBridgingRelease" : nullptr);
3546 // Bridge from a CF type to an ARC type.
3547 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC)) {
3548 bool br = S.isKnownName("CFBridgingRetain");
3549 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3550 << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit
3551 << unsigned(castExprType->isBlockPointerType()) // of ObjC|block type
3553 << 2 // to C pointer type
3556 << castExpr->getSourceRange();
3557 ACCResult CreateRule =
3558 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3559 assert(CreateRule != ACC_bottom && "This cast should already be accepted.");
3560 if (CreateRule != ACC_plusOne)
3562 DiagnosticBuilder DiagB =
3563 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3564 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3565 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3566 castType, castExpr, realCast, "__bridge ",
3569 if (CreateRule != ACC_plusZero)
3571 DiagnosticBuilder DiagB =
3572 (CCK == Sema::CCK_OtherCast && !br) ?
3573 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_retained) << castType :
3574 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3575 diag::note_arc_bridge_retained)
3578 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3579 castType, castExpr, realCast, "__bridge_retained ",
3580 br ? "CFBridgingRetain" : nullptr);
3586 S.Diag(loc, diag::err_arc_mismatched_cast)
3587 << (CCK != Sema::CCK_ImplicitConversion)
3588 << srcKind << castExprType << castType
3589 << castRange << castExpr->getSourceRange();
3592 template <typename TB>
3593 static bool CheckObjCBridgeNSCast(Sema &S, QualType castType, Expr *castExpr,
3594 bool &HadTheAttribute, bool warn) {
3595 QualType T = castExpr->getType();
3596 HadTheAttribute = false;
3597 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3598 TypedefNameDecl *TDNDecl = TD->getDecl();
3599 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3600 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3601 HadTheAttribute = true;
3602 if (Parm->isStr("id"))
3605 NamedDecl *Target = nullptr;
3606 // Check for an existing type with this name.
3607 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3608 Sema::LookupOrdinaryName);
3609 if (S.LookupName(R, S.TUScope)) {
3610 Target = R.getFoundDecl();
3611 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3612 ObjCInterfaceDecl *ExprClass = cast<ObjCInterfaceDecl>(Target);
3613 if (const ObjCObjectPointerType *InterfacePointerType =
3614 castType->getAsObjCInterfacePointerType()) {
3615 ObjCInterfaceDecl *CastClass
3616 = InterfacePointerType->getObjectType()->getInterface();
3617 if ((CastClass == ExprClass) ||
3618 (CastClass && CastClass->isSuperClassOf(ExprClass)))
3621 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge)
3622 << T << Target->getName() << castType->getPointeeType();
3624 } else if (castType->isObjCIdType() ||
3625 (S.Context.ObjCObjectAdoptsQTypeProtocols(
3626 castType, ExprClass)))
3627 // ok to cast to 'id'.
3628 // casting to id<p-list> is ok if bridge type adopts all of
3629 // p-list protocols.
3633 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge)
3634 << T << Target->getName() << castType;
3635 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3636 S.Diag(Target->getLocStart(), diag::note_declared_at);
3641 } else if (!castType->isObjCIdType()) {
3642 S.Diag(castExpr->getLocStart(), diag::err_objc_cf_bridged_not_interface)
3643 << castExpr->getType() << Parm;
3644 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3646 S.Diag(Target->getLocStart(), diag::note_declared_at);
3652 T = TDNDecl->getUnderlyingType();
3657 template <typename TB>
3658 static bool CheckObjCBridgeCFCast(Sema &S, QualType castType, Expr *castExpr,
3659 bool &HadTheAttribute, bool warn) {
3660 QualType T = castType;
3661 HadTheAttribute = false;
3662 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3663 TypedefNameDecl *TDNDecl = TD->getDecl();
3664 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3665 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3666 HadTheAttribute = true;
3667 if (Parm->isStr("id"))
3670 NamedDecl *Target = nullptr;
3671 // Check for an existing type with this name.
3672 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3673 Sema::LookupOrdinaryName);
3674 if (S.LookupName(R, S.TUScope)) {
3675 Target = R.getFoundDecl();
3676 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3677 ObjCInterfaceDecl *CastClass = cast<ObjCInterfaceDecl>(Target);
3678 if (const ObjCObjectPointerType *InterfacePointerType =
3679 castExpr->getType()->getAsObjCInterfacePointerType()) {
3680 ObjCInterfaceDecl *ExprClass
3681 = InterfacePointerType->getObjectType()->getInterface();
3682 if ((CastClass == ExprClass) ||
3683 (ExprClass && CastClass->isSuperClassOf(ExprClass)))
3686 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge_to_cf)
3687 << castExpr->getType()->getPointeeType() << T;
3688 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3691 } else if (castExpr->getType()->isObjCIdType() ||
3692 (S.Context.QIdProtocolsAdoptObjCObjectProtocols(
3693 castExpr->getType(), CastClass)))
3694 // ok to cast an 'id' expression to a CFtype.
3695 // ok to cast an 'id<plist>' expression to CFtype provided plist
3696 // adopts all of CFtype's ObjetiveC's class plist.
3700 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge_to_cf)
3701 << castExpr->getType() << castType;
3702 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3703 S.Diag(Target->getLocStart(), diag::note_declared_at);
3709 S.Diag(castExpr->getLocStart(), diag::err_objc_ns_bridged_invalid_cfobject)
3710 << castExpr->getType() << castType;
3711 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3713 S.Diag(Target->getLocStart(), diag::note_declared_at);
3718 T = TDNDecl->getUnderlyingType();
3723 void Sema::CheckTollFreeBridgeCast(QualType castType, Expr *castExpr) {
3724 if (!getLangOpts().ObjC1)
3726 // warn in presence of __bridge casting to or from a toll free bridge cast.
3727 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExpr->getType());
3728 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
3729 if (castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) {
3730 bool HasObjCBridgeAttr;
3731 bool ObjCBridgeAttrWillNotWarn =
3732 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3734 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3736 bool HasObjCBridgeMutableAttr;
3737 bool ObjCBridgeMutableAttrWillNotWarn =
3738 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3739 HasObjCBridgeMutableAttr, false);
3740 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3743 if (HasObjCBridgeAttr)
3744 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3746 else if (HasObjCBridgeMutableAttr)
3747 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3748 HasObjCBridgeMutableAttr, true);
3750 else if (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable) {
3751 bool HasObjCBridgeAttr;
3752 bool ObjCBridgeAttrWillNotWarn =
3753 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3755 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3757 bool HasObjCBridgeMutableAttr;
3758 bool ObjCBridgeMutableAttrWillNotWarn =
3759 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3760 HasObjCBridgeMutableAttr, false);
3761 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3764 if (HasObjCBridgeAttr)
3765 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3767 else if (HasObjCBridgeMutableAttr)
3768 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3769 HasObjCBridgeMutableAttr, true);
3773 void Sema::CheckObjCBridgeRelatedCast(QualType castType, Expr *castExpr) {
3774 QualType SrcType = castExpr->getType();
3775 if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(castExpr)) {
3776 if (PRE->isExplicitProperty()) {
3777 if (ObjCPropertyDecl *PDecl = PRE->getExplicitProperty())
3778 SrcType = PDecl->getType();
3780 else if (PRE->isImplicitProperty()) {
3781 if (ObjCMethodDecl *Getter = PRE->getImplicitPropertyGetter())
3782 SrcType = Getter->getReturnType();
3787 ARCConversionTypeClass srcExprACTC = classifyTypeForARCConversion(SrcType);
3788 ARCConversionTypeClass castExprACTC = classifyTypeForARCConversion(castType);
3789 if (srcExprACTC != ACTC_retainable || castExprACTC != ACTC_coreFoundation)
3791 CheckObjCBridgeRelatedConversions(castExpr->getLocStart(),
3792 castType, SrcType, castExpr);
3796 bool Sema::CheckTollFreeBridgeStaticCast(QualType castType, Expr *castExpr,
3798 if (!getLangOpts().ObjC1)
3800 ARCConversionTypeClass exprACTC =
3801 classifyTypeForARCConversion(castExpr->getType());
3802 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
3803 if ((castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) ||
3804 (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable)) {
3805 CheckTollFreeBridgeCast(castType, castExpr);
3806 Kind = (castACTC == ACTC_coreFoundation) ? CK_BitCast
3807 : CK_CPointerToObjCPointerCast;
3813 bool Sema::checkObjCBridgeRelatedComponents(SourceLocation Loc,
3814 QualType DestType, QualType SrcType,
3815 ObjCInterfaceDecl *&RelatedClass,
3816 ObjCMethodDecl *&ClassMethod,
3817 ObjCMethodDecl *&InstanceMethod,
3818 TypedefNameDecl *&TDNDecl,
3819 bool CfToNs, bool Diagnose) {
3820 QualType T = CfToNs ? SrcType : DestType;
3821 ObjCBridgeRelatedAttr *ObjCBAttr = ObjCBridgeRelatedAttrFromType(T, TDNDecl);
3825 IdentifierInfo *RCId = ObjCBAttr->getRelatedClass();
3826 IdentifierInfo *CMId = ObjCBAttr->getClassMethod();
3827 IdentifierInfo *IMId = ObjCBAttr->getInstanceMethod();
3830 NamedDecl *Target = nullptr;
3831 // Check for an existing type with this name.
3832 LookupResult R(*this, DeclarationName(RCId), SourceLocation(),
3833 Sema::LookupOrdinaryName);
3834 if (!LookupName(R, TUScope)) {
3836 Diag(Loc, diag::err_objc_bridged_related_invalid_class) << RCId
3837 << SrcType << DestType;
3838 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3842 Target = R.getFoundDecl();
3843 if (Target && isa<ObjCInterfaceDecl>(Target))
3844 RelatedClass = cast<ObjCInterfaceDecl>(Target);
3847 Diag(Loc, diag::err_objc_bridged_related_invalid_class_name) << RCId
3848 << SrcType << DestType;
3849 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3851 Diag(Target->getLocStart(), diag::note_declared_at);
3856 // Check for an existing class method with the given selector name.
3857 if (CfToNs && CMId) {
3858 Selector Sel = Context.Selectors.getUnarySelector(CMId);
3859 ClassMethod = RelatedClass->lookupMethod(Sel, false);
3862 Diag(Loc, diag::err_objc_bridged_related_known_method)
3863 << SrcType << DestType << Sel << false;
3864 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3870 // Check for an existing instance method with the given selector name.
3871 if (!CfToNs && IMId) {
3872 Selector Sel = Context.Selectors.getNullarySelector(IMId);
3873 InstanceMethod = RelatedClass->lookupMethod(Sel, true);
3874 if (!InstanceMethod) {
3876 Diag(Loc, diag::err_objc_bridged_related_known_method)
3877 << SrcType << DestType << Sel << true;
3878 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3887 Sema::CheckObjCBridgeRelatedConversions(SourceLocation Loc,
3888 QualType DestType, QualType SrcType,
3889 Expr *&SrcExpr, bool Diagnose) {
3890 ARCConversionTypeClass rhsExprACTC = classifyTypeForARCConversion(SrcType);
3891 ARCConversionTypeClass lhsExprACTC = classifyTypeForARCConversion(DestType);
3892 bool CfToNs = (rhsExprACTC == ACTC_coreFoundation && lhsExprACTC == ACTC_retainable);
3893 bool NsToCf = (rhsExprACTC == ACTC_retainable && lhsExprACTC == ACTC_coreFoundation);
3894 if (!CfToNs && !NsToCf)
3897 ObjCInterfaceDecl *RelatedClass;
3898 ObjCMethodDecl *ClassMethod = nullptr;
3899 ObjCMethodDecl *InstanceMethod = nullptr;
3900 TypedefNameDecl *TDNDecl = nullptr;
3901 if (!checkObjCBridgeRelatedComponents(Loc, DestType, SrcType, RelatedClass,
3902 ClassMethod, InstanceMethod, TDNDecl,
3907 // Implicit conversion from CF to ObjC object is needed.
3910 std::string ExpressionString = "[";
3911 ExpressionString += RelatedClass->getNameAsString();
3912 ExpressionString += " ";
3913 ExpressionString += ClassMethod->getSelector().getAsString();
3914 SourceLocation SrcExprEndLoc = getLocForEndOfToken(SrcExpr->getLocEnd());
3915 // Provide a fixit: [RelatedClass ClassMethod SrcExpr]
3916 Diag(Loc, diag::err_objc_bridged_related_known_method)
3917 << SrcType << DestType << ClassMethod->getSelector() << false
3918 << FixItHint::CreateInsertion(SrcExpr->getLocStart(), ExpressionString)
3919 << FixItHint::CreateInsertion(SrcExprEndLoc, "]");
3920 Diag(RelatedClass->getLocStart(), diag::note_declared_at);
3921 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3924 QualType receiverType = Context.getObjCInterfaceType(RelatedClass);
3926 Expr *args[] = { SrcExpr };
3927 ExprResult msg = BuildClassMessageImplicit(receiverType, false,
3928 ClassMethod->getLocation(),
3929 ClassMethod->getSelector(), ClassMethod,
3930 MultiExprArg(args, 1));
3931 SrcExpr = msg.get();
3936 // Implicit conversion from ObjC type to CF object is needed.
3937 if (InstanceMethod) {
3939 std::string ExpressionString;
3940 SourceLocation SrcExprEndLoc =
3941 getLocForEndOfToken(SrcExpr->getLocEnd());
3942 if (InstanceMethod->isPropertyAccessor())
3943 if (const ObjCPropertyDecl *PDecl =
3944 InstanceMethod->findPropertyDecl()) {
3945 // fixit: ObjectExpr.propertyname when it is aproperty accessor.
3946 ExpressionString = ".";
3947 ExpressionString += PDecl->getNameAsString();
3948 Diag(Loc, diag::err_objc_bridged_related_known_method)
3949 << SrcType << DestType << InstanceMethod->getSelector() << true
3950 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
3952 if (ExpressionString.empty()) {
3953 // Provide a fixit: [ObjectExpr InstanceMethod]
3954 ExpressionString = " ";
3955 ExpressionString += InstanceMethod->getSelector().getAsString();
3956 ExpressionString += "]";
3958 Diag(Loc, diag::err_objc_bridged_related_known_method)
3959 << SrcType << DestType << InstanceMethod->getSelector() << true
3960 << FixItHint::CreateInsertion(SrcExpr->getLocStart(), "[")
3961 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
3963 Diag(RelatedClass->getLocStart(), diag::note_declared_at);
3964 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3968 BuildInstanceMessageImplicit(SrcExpr, SrcType,
3969 InstanceMethod->getLocation(),
3970 InstanceMethod->getSelector(),
3971 InstanceMethod, None);
3972 SrcExpr = msg.get();
3979 Sema::ARCConversionResult
3980 Sema::CheckObjCARCConversion(SourceRange castRange, QualType castType,
3981 Expr *&castExpr, CheckedConversionKind CCK,
3983 bool DiagnoseCFAudited,
3984 BinaryOperatorKind Opc) {
3985 QualType castExprType = castExpr->getType();
3987 // For the purposes of the classification, we assume reference types
3988 // will bind to temporaries.
3989 QualType effCastType = castType;
3990 if (const ReferenceType *ref = castType->getAs<ReferenceType>())
3991 effCastType = ref->getPointeeType();
3993 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExprType);
3994 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(effCastType);
3995 if (exprACTC == castACTC) {
3996 // check for viablity and report error if casting an rvalue to a
3997 // life-time qualifier.
3998 if (Diagnose && castACTC == ACTC_retainable &&
3999 (CCK == CCK_CStyleCast || CCK == CCK_OtherCast) &&
4000 castType != castExprType) {
4001 const Type *DT = castType.getTypePtr();
4002 QualType QDT = castType;
4003 // We desugar some types but not others. We ignore those
4004 // that cannot happen in a cast; i.e. auto, and those which
4005 // should not be de-sugared; i.e typedef.
4006 if (const ParenType *PT = dyn_cast<ParenType>(DT))
4007 QDT = PT->desugar();
4008 else if (const TypeOfType *TP = dyn_cast<TypeOfType>(DT))
4009 QDT = TP->desugar();
4010 else if (const AttributedType *AT = dyn_cast<AttributedType>(DT))
4011 QDT = AT->desugar();
4012 if (QDT != castType &&
4013 QDT.getObjCLifetime() != Qualifiers::OCL_None) {
4014 SourceLocation loc =
4015 (castRange.isValid() ? castRange.getBegin()
4016 : castExpr->getExprLoc());
4017 Diag(loc, diag::err_arc_nolifetime_behavior);
4023 if (isAnyCLike(exprACTC) && isAnyCLike(castACTC)) return ACR_okay;
4025 // Allow all of these types to be cast to integer types (but not
4027 if (castACTC == ACTC_none && castType->isIntegralType(Context))
4030 // Allow casts between pointers to lifetime types (e.g., __strong id*)
4031 // and pointers to void (e.g., cv void *). Casting from void* to lifetime*
4032 // must be explicit.
4033 if (exprACTC == ACTC_indirectRetainable && castACTC == ACTC_voidPtr)
4035 if (castACTC == ACTC_indirectRetainable && exprACTC == ACTC_voidPtr &&
4036 CCK != CCK_ImplicitConversion)
4039 switch (ARCCastChecker(Context, exprACTC, castACTC, false).Visit(castExpr)) {
4040 // For invalid casts, fall through.
4044 // Do nothing for both bottom and +0.
4049 // If the result is +1, consume it here.
4051 castExpr = ImplicitCastExpr::Create(Context, castExpr->getType(),
4052 CK_ARCConsumeObject, castExpr,
4053 nullptr, VK_RValue);
4054 ExprNeedsCleanups = true;
4058 // If this is a non-implicit cast from id or block type to a
4059 // CoreFoundation type, delay complaining in case the cast is used
4060 // in an acceptable context.
4061 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC) &&
4062 CCK != CCK_ImplicitConversion)
4063 return ACR_unbridged;
4065 // Do not issue bridge cast" diagnostic when implicit casting a cstring
4066 // to 'NSString *'. Let caller issue a normal mismatched diagnostic with
4068 if (castACTC == ACTC_retainable && exprACTC == ACTC_none &&
4069 ConversionToObjCStringLiteralCheck(castType, castExpr, Diagnose))
4072 // Do not issue "bridge cast" diagnostic when implicit casting
4073 // a retainable object to a CF type parameter belonging to an audited
4074 // CF API function. Let caller issue a normal type mismatched diagnostic
4077 (!DiagnoseCFAudited || exprACTC != ACTC_retainable ||
4078 castACTC != ACTC_coreFoundation))
4079 if (!(exprACTC == ACTC_voidPtr && castACTC == ACTC_retainable &&
4080 (Opc == BO_NE || Opc == BO_EQ)))
4081 diagnoseObjCARCConversion(*this, castRange, castType, castACTC, castExpr,
4082 castExpr, exprACTC, CCK);
4086 /// Given that we saw an expression with the ARCUnbridgedCastTy
4087 /// placeholder type, complain bitterly.
4088 void Sema::diagnoseARCUnbridgedCast(Expr *e) {
4089 // We expect the spurious ImplicitCastExpr to already have been stripped.
4090 assert(!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast));
4091 CastExpr *realCast = cast<CastExpr>(e->IgnoreParens());
4093 SourceRange castRange;
4095 CheckedConversionKind CCK;
4097 if (CStyleCastExpr *cast = dyn_cast<CStyleCastExpr>(realCast)) {
4098 castRange = SourceRange(cast->getLParenLoc(), cast->getRParenLoc());
4099 castType = cast->getTypeAsWritten();
4100 CCK = CCK_CStyleCast;
4101 } else if (ExplicitCastExpr *cast = dyn_cast<ExplicitCastExpr>(realCast)) {
4102 castRange = cast->getTypeInfoAsWritten()->getTypeLoc().getSourceRange();
4103 castType = cast->getTypeAsWritten();
4104 CCK = CCK_OtherCast;
4106 castType = cast->getType();
4107 CCK = CCK_ImplicitConversion;
4110 ARCConversionTypeClass castACTC =
4111 classifyTypeForARCConversion(castType.getNonReferenceType());
4113 Expr *castExpr = realCast->getSubExpr();
4114 assert(classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable);
4116 diagnoseObjCARCConversion(*this, castRange, castType, castACTC,
4117 castExpr, realCast, ACTC_retainable, CCK);
4120 /// stripARCUnbridgedCast - Given an expression of ARCUnbridgedCast
4121 /// type, remove the placeholder cast.
4122 Expr *Sema::stripARCUnbridgedCast(Expr *e) {
4123 assert(e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast));
4125 if (ParenExpr *pe = dyn_cast<ParenExpr>(e)) {
4126 Expr *sub = stripARCUnbridgedCast(pe->getSubExpr());
4127 return new (Context) ParenExpr(pe->getLParen(), pe->getRParen(), sub);
4128 } else if (UnaryOperator *uo = dyn_cast<UnaryOperator>(e)) {
4129 assert(uo->getOpcode() == UO_Extension);
4130 Expr *sub = stripARCUnbridgedCast(uo->getSubExpr());
4131 return new (Context) UnaryOperator(sub, UO_Extension, sub->getType(),
4132 sub->getValueKind(), sub->getObjectKind(),
4133 uo->getOperatorLoc());
4134 } else if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) {
4135 assert(!gse->isResultDependent());
4137 unsigned n = gse->getNumAssocs();
4138 SmallVector<Expr*, 4> subExprs(n);
4139 SmallVector<TypeSourceInfo*, 4> subTypes(n);
4140 for (unsigned i = 0; i != n; ++i) {
4141 subTypes[i] = gse->getAssocTypeSourceInfo(i);
4142 Expr *sub = gse->getAssocExpr(i);
4143 if (i == gse->getResultIndex())
4144 sub = stripARCUnbridgedCast(sub);
4148 return new (Context) GenericSelectionExpr(Context, gse->getGenericLoc(),
4149 gse->getControllingExpr(),
4151 gse->getDefaultLoc(),
4152 gse->getRParenLoc(),
4153 gse->containsUnexpandedParameterPack(),
4154 gse->getResultIndex());
4156 assert(isa<ImplicitCastExpr>(e) && "bad form of unbridged cast!");
4157 return cast<ImplicitCastExpr>(e)->getSubExpr();
4161 bool Sema::CheckObjCARCUnavailableWeakConversion(QualType castType,
4162 QualType exprType) {
4163 QualType canCastType =
4164 Context.getCanonicalType(castType).getUnqualifiedType();
4165 QualType canExprType =
4166 Context.getCanonicalType(exprType).getUnqualifiedType();
4167 if (isa<ObjCObjectPointerType>(canCastType) &&
4168 castType.getObjCLifetime() == Qualifiers::OCL_Weak &&
4169 canExprType->isObjCObjectPointerType()) {
4170 if (const ObjCObjectPointerType *ObjT =
4171 canExprType->getAs<ObjCObjectPointerType>())
4172 if (const ObjCInterfaceDecl *ObjI = ObjT->getInterfaceDecl())
4173 return !ObjI->isArcWeakrefUnavailable();
4178 /// Look for an ObjCReclaimReturnedObject cast and destroy it.
4179 static Expr *maybeUndoReclaimObject(Expr *e) {
4180 // For now, we just undo operands that are *immediately* reclaim
4181 // expressions, which prevents the vast majority of potential
4182 // problems here. To catch them all, we'd need to rebuild arbitrary
4183 // value-propagating subexpressions --- we can't reliably rebuild
4184 // in-place because of expression sharing.
4185 if (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e))
4186 if (ice->getCastKind() == CK_ARCReclaimReturnedObject)
4187 return ice->getSubExpr();
4192 ExprResult Sema::BuildObjCBridgedCast(SourceLocation LParenLoc,
4193 ObjCBridgeCastKind Kind,
4194 SourceLocation BridgeKeywordLoc,
4195 TypeSourceInfo *TSInfo,
4197 ExprResult SubResult = UsualUnaryConversions(SubExpr);
4198 if (SubResult.isInvalid()) return ExprError();
4199 SubExpr = SubResult.get();
4201 QualType T = TSInfo->getType();
4202 QualType FromType = SubExpr->getType();
4206 bool MustConsume = false;
4207 if (T->isDependentType() || SubExpr->isTypeDependent()) {
4208 // Okay: we'll build a dependent expression type.
4210 } else if (T->isObjCARCBridgableType() && FromType->isCARCBridgableType()) {
4212 CK = (T->isBlockPointerType() ? CK_AnyPointerToBlockPointerCast
4213 : CK_CPointerToObjCPointerCast);
4218 case OBC_BridgeRetained: {
4219 bool br = isKnownName("CFBridgingRelease");
4220 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4223 << (T->isBlockPointerType()? 1 : 0)
4225 << SubExpr->getSourceRange()
4227 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4228 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge");
4229 Diag(BridgeKeywordLoc, diag::note_arc_bridge_transfer)
4231 << FixItHint::CreateReplacement(BridgeKeywordLoc,
4232 br ? "CFBridgingRelease "
4233 : "__bridge_transfer ");
4239 case OBC_BridgeTransfer:
4240 // We must consume the Objective-C object produced by the cast.
4244 } else if (T->isCARCBridgableType() && FromType->isObjCARCBridgableType()) {
4249 // Reclaiming a value that's going to be __bridge-casted to CF
4250 // is very dangerous, so we don't do it.
4251 SubExpr = maybeUndoReclaimObject(SubExpr);
4254 case OBC_BridgeRetained:
4255 // Produce the object before casting it.
4256 SubExpr = ImplicitCastExpr::Create(Context, FromType,
4257 CK_ARCProduceObject,
4258 SubExpr, nullptr, VK_RValue);
4261 case OBC_BridgeTransfer: {
4262 bool br = isKnownName("CFBridgingRetain");
4263 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4264 << (FromType->isBlockPointerType()? 1 : 0)
4268 << SubExpr->getSourceRange()
4271 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4272 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge ");
4273 Diag(BridgeKeywordLoc, diag::note_arc_bridge_retained)
4275 << FixItHint::CreateReplacement(BridgeKeywordLoc,
4276 br ? "CFBridgingRetain " : "__bridge_retained");
4283 Diag(LParenLoc, diag::err_arc_bridge_cast_incompatible)
4284 << FromType << T << Kind
4285 << SubExpr->getSourceRange()
4286 << TSInfo->getTypeLoc().getSourceRange();
4290 Expr *Result = new (Context) ObjCBridgedCastExpr(LParenLoc, Kind, CK,
4295 ExprNeedsCleanups = true;
4296 Result = ImplicitCastExpr::Create(Context, T, CK_ARCConsumeObject, Result,
4297 nullptr, VK_RValue);
4303 ExprResult Sema::ActOnObjCBridgedCast(Scope *S,
4304 SourceLocation LParenLoc,
4305 ObjCBridgeCastKind Kind,
4306 SourceLocation BridgeKeywordLoc,
4308 SourceLocation RParenLoc,
4310 TypeSourceInfo *TSInfo = nullptr;
4311 QualType T = GetTypeFromParser(Type, &TSInfo);
4312 if (Kind == OBC_Bridge)
4313 CheckTollFreeBridgeCast(T, SubExpr);
4315 TSInfo = Context.getTrivialTypeSourceInfo(T, LParenLoc);
4316 return BuildObjCBridgedCast(LParenLoc, Kind, BridgeKeywordLoc, TSInfo,