1 //===--- SemaExprObjC.cpp - Semantic Analysis for ObjC Expressions --------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This file implements semantic analysis for Objective-C expressions.
11 //===----------------------------------------------------------------------===//
13 #include "clang/AST/ASTContext.h"
14 #include "clang/AST/DeclObjC.h"
15 #include "clang/AST/ExprObjC.h"
16 #include "clang/AST/StmtVisitor.h"
17 #include "clang/AST/TypeLoc.h"
18 #include "clang/Analysis/DomainSpecific/CocoaConventions.h"
19 #include "clang/Basic/Builtins.h"
20 #include "clang/Edit/Commit.h"
21 #include "clang/Edit/Rewriters.h"
22 #include "clang/Lex/Preprocessor.h"
23 #include "clang/Sema/Initialization.h"
24 #include "clang/Sema/Lookup.h"
25 #include "clang/Sema/Scope.h"
26 #include "clang/Sema/ScopeInfo.h"
27 #include "clang/Sema/SemaInternal.h"
28 #include "llvm/ADT/SmallString.h"
29 #include "llvm/Support/ConvertUTF.h"
31 using namespace clang;
33 using llvm::makeArrayRef;
35 ExprResult Sema::ParseObjCStringLiteral(SourceLocation *AtLocs,
36 ArrayRef<Expr *> Strings) {
37 // Most ObjC strings are formed out of a single piece. However, we *can*
38 // have strings formed out of multiple @ strings with multiple pptokens in
39 // each one, e.g. @"foo" "bar" @"baz" "qux" which need to be turned into one
40 // StringLiteral for ObjCStringLiteral to hold onto.
41 StringLiteral *S = cast<StringLiteral>(Strings[0]);
43 // If we have a multi-part string, merge it all together.
44 if (Strings.size() != 1) {
45 // Concatenate objc strings.
46 SmallString<128> StrBuf;
47 SmallVector<SourceLocation, 8> StrLocs;
49 for (Expr *E : Strings) {
50 S = cast<StringLiteral>(E);
52 // ObjC strings can't be wide or UTF.
54 Diag(S->getBeginLoc(), diag::err_cfstring_literal_not_string_constant)
55 << S->getSourceRange();
60 StrBuf += S->getString();
62 // Get the locations of the string tokens.
63 StrLocs.append(S->tokloc_begin(), S->tokloc_end());
66 // Create the aggregate string with the appropriate content and location
68 const ConstantArrayType *CAT = Context.getAsConstantArrayType(S->getType());
69 assert(CAT && "String literal not of constant array type!");
70 QualType StrTy = Context.getConstantArrayType(
71 CAT->getElementType(), llvm::APInt(32, StrBuf.size() + 1), nullptr,
72 CAT->getSizeModifier(), CAT->getIndexTypeCVRQualifiers());
73 S = StringLiteral::Create(Context, StrBuf, StringLiteral::Ascii,
74 /*Pascal=*/false, StrTy, &StrLocs[0],
78 return BuildObjCStringLiteral(AtLocs[0], S);
81 ExprResult Sema::BuildObjCStringLiteral(SourceLocation AtLoc, StringLiteral *S){
82 // Verify that this composite string is acceptable for ObjC strings.
83 if (CheckObjCString(S))
86 // Initialize the constant string interface lazily. This assumes
87 // the NSString interface is seen in this translation unit. Note: We
88 // don't use NSConstantString, since the runtime team considers this
89 // interface private (even though it appears in the header files).
90 QualType Ty = Context.getObjCConstantStringInterface();
92 Ty = Context.getObjCObjectPointerType(Ty);
93 } else if (getLangOpts().NoConstantCFStrings) {
94 IdentifierInfo *NSIdent=nullptr;
95 std::string StringClass(getLangOpts().ObjCConstantStringClass);
97 if (StringClass.empty())
98 NSIdent = &Context.Idents.get("NSConstantString");
100 NSIdent = &Context.Idents.get(StringClass);
102 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
104 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
105 Context.setObjCConstantStringInterface(StrIF);
106 Ty = Context.getObjCConstantStringInterface();
107 Ty = Context.getObjCObjectPointerType(Ty);
109 // If there is no NSConstantString interface defined then treat this
110 // as error and recover from it.
111 Diag(S->getBeginLoc(), diag::err_no_nsconstant_string_class)
112 << NSIdent << S->getSourceRange();
113 Ty = Context.getObjCIdType();
116 IdentifierInfo *NSIdent = NSAPIObj->getNSClassId(NSAPI::ClassId_NSString);
117 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
119 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
120 Context.setObjCConstantStringInterface(StrIF);
121 Ty = Context.getObjCConstantStringInterface();
122 Ty = Context.getObjCObjectPointerType(Ty);
124 // If there is no NSString interface defined, implicitly declare
125 // a @class NSString; and use that instead. This is to make sure
126 // type of an NSString literal is represented correctly, instead of
127 // being an 'id' type.
128 Ty = Context.getObjCNSStringType();
130 ObjCInterfaceDecl *NSStringIDecl =
131 ObjCInterfaceDecl::Create (Context,
132 Context.getTranslationUnitDecl(),
133 SourceLocation(), NSIdent,
134 nullptr, nullptr, SourceLocation());
135 Ty = Context.getObjCInterfaceType(NSStringIDecl);
136 Context.setObjCNSStringType(Ty);
138 Ty = Context.getObjCObjectPointerType(Ty);
142 return new (Context) ObjCStringLiteral(S, Ty, AtLoc);
145 /// Emits an error if the given method does not exist, or if the return
146 /// type is not an Objective-C object.
147 static bool validateBoxingMethod(Sema &S, SourceLocation Loc,
148 const ObjCInterfaceDecl *Class,
149 Selector Sel, const ObjCMethodDecl *Method) {
151 // FIXME: Is there a better way to avoid quotes than using getName()?
152 S.Diag(Loc, diag::err_undeclared_boxing_method) << Sel << Class->getName();
156 // Make sure the return type is reasonable.
157 QualType ReturnType = Method->getReturnType();
158 if (!ReturnType->isObjCObjectPointerType()) {
159 S.Diag(Loc, diag::err_objc_literal_method_sig)
161 S.Diag(Method->getLocation(), diag::note_objc_literal_method_return)
169 /// Maps ObjCLiteralKind to NSClassIdKindKind
170 static NSAPI::NSClassIdKindKind ClassKindFromLiteralKind(
171 Sema::ObjCLiteralKind LiteralKind) {
172 switch (LiteralKind) {
174 return NSAPI::ClassId_NSArray;
175 case Sema::LK_Dictionary:
176 return NSAPI::ClassId_NSDictionary;
177 case Sema::LK_Numeric:
178 return NSAPI::ClassId_NSNumber;
179 case Sema::LK_String:
180 return NSAPI::ClassId_NSString;
182 return NSAPI::ClassId_NSValue;
184 // there is no corresponding matching
185 // between LK_None/LK_Block and NSClassIdKindKind
190 llvm_unreachable("LiteralKind can't be converted into a ClassKind");
193 /// Validates ObjCInterfaceDecl availability.
194 /// ObjCInterfaceDecl, used to create ObjC literals, should be defined
195 /// if clang not in a debugger mode.
196 static bool ValidateObjCLiteralInterfaceDecl(Sema &S, ObjCInterfaceDecl *Decl,
198 Sema::ObjCLiteralKind LiteralKind) {
200 NSAPI::NSClassIdKindKind Kind = ClassKindFromLiteralKind(LiteralKind);
201 IdentifierInfo *II = S.NSAPIObj->getNSClassId(Kind);
202 S.Diag(Loc, diag::err_undeclared_objc_literal_class)
203 << II->getName() << LiteralKind;
205 } else if (!Decl->hasDefinition() && !S.getLangOpts().DebuggerObjCLiteral) {
206 S.Diag(Loc, diag::err_undeclared_objc_literal_class)
207 << Decl->getName() << LiteralKind;
208 S.Diag(Decl->getLocation(), diag::note_forward_class);
215 /// Looks up ObjCInterfaceDecl of a given NSClassIdKindKind.
216 /// Used to create ObjC literals, such as NSDictionary (@{}),
217 /// NSArray (@[]) and Boxed Expressions (@())
218 static ObjCInterfaceDecl *LookupObjCInterfaceDeclForLiteral(Sema &S,
220 Sema::ObjCLiteralKind LiteralKind) {
221 NSAPI::NSClassIdKindKind ClassKind = ClassKindFromLiteralKind(LiteralKind);
222 IdentifierInfo *II = S.NSAPIObj->getNSClassId(ClassKind);
223 NamedDecl *IF = S.LookupSingleName(S.TUScope, II, Loc,
224 Sema::LookupOrdinaryName);
225 ObjCInterfaceDecl *ID = dyn_cast_or_null<ObjCInterfaceDecl>(IF);
226 if (!ID && S.getLangOpts().DebuggerObjCLiteral) {
227 ASTContext &Context = S.Context;
228 TranslationUnitDecl *TU = Context.getTranslationUnitDecl();
229 ID = ObjCInterfaceDecl::Create (Context, TU, SourceLocation(), II,
230 nullptr, nullptr, SourceLocation());
233 if (!ValidateObjCLiteralInterfaceDecl(S, ID, Loc, LiteralKind)) {
240 /// Retrieve the NSNumber factory method that should be used to create
241 /// an Objective-C literal for the given type.
242 static ObjCMethodDecl *getNSNumberFactoryMethod(Sema &S, SourceLocation Loc,
244 bool isLiteral = false,
245 SourceRange R = SourceRange()) {
246 Optional<NSAPI::NSNumberLiteralMethodKind> Kind =
247 S.NSAPIObj->getNSNumberFactoryMethodKind(NumberType);
251 S.Diag(Loc, diag::err_invalid_nsnumber_type)
257 // If we already looked up this method, we're done.
258 if (S.NSNumberLiteralMethods[*Kind])
259 return S.NSNumberLiteralMethods[*Kind];
261 Selector Sel = S.NSAPIObj->getNSNumberLiteralSelector(*Kind,
264 ASTContext &CX = S.Context;
266 // Look up the NSNumber class, if we haven't done so already. It's cached
267 // in the Sema instance.
268 if (!S.NSNumberDecl) {
269 S.NSNumberDecl = LookupObjCInterfaceDeclForLiteral(S, Loc,
271 if (!S.NSNumberDecl) {
276 if (S.NSNumberPointer.isNull()) {
277 // generate the pointer to NSNumber type.
278 QualType NSNumberObject = CX.getObjCInterfaceType(S.NSNumberDecl);
279 S.NSNumberPointer = CX.getObjCObjectPointerType(NSNumberObject);
282 // Look for the appropriate method within NSNumber.
283 ObjCMethodDecl *Method = S.NSNumberDecl->lookupClassMethod(Sel);
284 if (!Method && S.getLangOpts().DebuggerObjCLiteral) {
285 // create a stub definition this NSNumber factory method.
286 TypeSourceInfo *ReturnTInfo = nullptr;
288 ObjCMethodDecl::Create(CX, SourceLocation(), SourceLocation(), Sel,
289 S.NSNumberPointer, ReturnTInfo, S.NSNumberDecl,
290 /*isInstance=*/false, /*isVariadic=*/false,
291 /*isPropertyAccessor=*/false,
292 /*isSynthesizedAccessorStub=*/false,
293 /*isImplicitlyDeclared=*/true,
294 /*isDefined=*/false, ObjCMethodDecl::Required,
295 /*HasRelatedResultType=*/false);
296 ParmVarDecl *value = ParmVarDecl::Create(S.Context, Method,
297 SourceLocation(), SourceLocation(),
298 &CX.Idents.get("value"),
299 NumberType, /*TInfo=*/nullptr,
301 Method->setMethodParams(S.Context, value, None);
304 if (!validateBoxingMethod(S, Loc, S.NSNumberDecl, Sel, Method))
307 // Note: if the parameter type is out-of-line, we'll catch it later in the
308 // implicit conversion.
310 S.NSNumberLiteralMethods[*Kind] = Method;
314 /// BuildObjCNumericLiteral - builds an ObjCBoxedExpr AST node for the
315 /// numeric literal expression. Type of the expression will be "NSNumber *".
316 ExprResult Sema::BuildObjCNumericLiteral(SourceLocation AtLoc, Expr *Number) {
317 // Determine the type of the literal.
318 QualType NumberType = Number->getType();
319 if (CharacterLiteral *Char = dyn_cast<CharacterLiteral>(Number)) {
320 // In C, character literals have type 'int'. That's not the type we want
321 // to use to determine the Objective-c literal kind.
322 switch (Char->getKind()) {
323 case CharacterLiteral::Ascii:
324 case CharacterLiteral::UTF8:
325 NumberType = Context.CharTy;
328 case CharacterLiteral::Wide:
329 NumberType = Context.getWideCharType();
332 case CharacterLiteral::UTF16:
333 NumberType = Context.Char16Ty;
336 case CharacterLiteral::UTF32:
337 NumberType = Context.Char32Ty;
342 // Look for the appropriate method within NSNumber.
343 // Construct the literal.
344 SourceRange NR(Number->getSourceRange());
345 ObjCMethodDecl *Method = getNSNumberFactoryMethod(*this, AtLoc, NumberType,
350 // Convert the number to the type that the parameter expects.
351 ParmVarDecl *ParamDecl = Method->parameters()[0];
352 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
354 ExprResult ConvertedNumber = PerformCopyInitialization(Entity,
357 if (ConvertedNumber.isInvalid())
359 Number = ConvertedNumber.get();
361 // Use the effective source range of the literal, including the leading '@'.
362 return MaybeBindToTemporary(
363 new (Context) ObjCBoxedExpr(Number, NSNumberPointer, Method,
364 SourceRange(AtLoc, NR.getEnd())));
367 ExprResult Sema::ActOnObjCBoolLiteral(SourceLocation AtLoc,
368 SourceLocation ValueLoc,
371 if (getLangOpts().CPlusPlus) {
372 Inner = ActOnCXXBoolLiteral(ValueLoc, Value? tok::kw_true : tok::kw_false);
374 // C doesn't actually have a way to represent literal values of type
375 // _Bool. So, we'll use 0/1 and implicit cast to _Bool.
376 Inner = ActOnIntegerConstant(ValueLoc, Value? 1 : 0);
377 Inner = ImpCastExprToType(Inner.get(), Context.BoolTy,
378 CK_IntegralToBoolean);
381 return BuildObjCNumericLiteral(AtLoc, Inner.get());
384 /// Check that the given expression is a valid element of an Objective-C
385 /// collection literal.
386 static ExprResult CheckObjCCollectionLiteralElement(Sema &S, Expr *Element,
388 bool ArrayLiteral = false) {
389 // If the expression is type-dependent, there's nothing for us to do.
390 if (Element->isTypeDependent())
393 ExprResult Result = S.CheckPlaceholderExpr(Element);
394 if (Result.isInvalid())
396 Element = Result.get();
398 // In C++, check for an implicit conversion to an Objective-C object pointer
400 if (S.getLangOpts().CPlusPlus && Element->getType()->isRecordType()) {
401 InitializedEntity Entity
402 = InitializedEntity::InitializeParameter(S.Context, T,
404 InitializationKind Kind = InitializationKind::CreateCopy(
405 Element->getBeginLoc(), SourceLocation());
406 InitializationSequence Seq(S, Entity, Kind, Element);
408 return Seq.Perform(S, Entity, Kind, Element);
411 Expr *OrigElement = Element;
413 // Perform lvalue-to-rvalue conversion.
414 Result = S.DefaultLvalueConversion(Element);
415 if (Result.isInvalid())
417 Element = Result.get();
419 // Make sure that we have an Objective-C pointer type or block.
420 if (!Element->getType()->isObjCObjectPointerType() &&
421 !Element->getType()->isBlockPointerType()) {
422 bool Recovered = false;
424 // If this is potentially an Objective-C numeric literal, add the '@'.
425 if (isa<IntegerLiteral>(OrigElement) ||
426 isa<CharacterLiteral>(OrigElement) ||
427 isa<FloatingLiteral>(OrigElement) ||
428 isa<ObjCBoolLiteralExpr>(OrigElement) ||
429 isa<CXXBoolLiteralExpr>(OrigElement)) {
430 if (S.NSAPIObj->getNSNumberFactoryMethodKind(OrigElement->getType())) {
431 int Which = isa<CharacterLiteral>(OrigElement) ? 1
432 : (isa<CXXBoolLiteralExpr>(OrigElement) ||
433 isa<ObjCBoolLiteralExpr>(OrigElement)) ? 2
436 S.Diag(OrigElement->getBeginLoc(), diag::err_box_literal_collection)
437 << Which << OrigElement->getSourceRange()
438 << FixItHint::CreateInsertion(OrigElement->getBeginLoc(), "@");
441 S.BuildObjCNumericLiteral(OrigElement->getBeginLoc(), OrigElement);
442 if (Result.isInvalid())
445 Element = Result.get();
449 // If this is potentially an Objective-C string literal, add the '@'.
450 else if (StringLiteral *String = dyn_cast<StringLiteral>(OrigElement)) {
451 if (String->isAscii()) {
452 S.Diag(OrigElement->getBeginLoc(), diag::err_box_literal_collection)
453 << 0 << OrigElement->getSourceRange()
454 << FixItHint::CreateInsertion(OrigElement->getBeginLoc(), "@");
456 Result = S.BuildObjCStringLiteral(OrigElement->getBeginLoc(), String);
457 if (Result.isInvalid())
460 Element = Result.get();
466 S.Diag(Element->getBeginLoc(), diag::err_invalid_collection_element)
467 << Element->getType();
472 if (ObjCStringLiteral *getString =
473 dyn_cast<ObjCStringLiteral>(OrigElement)) {
474 if (StringLiteral *SL = getString->getString()) {
475 unsigned numConcat = SL->getNumConcatenated();
477 // Only warn if the concatenated string doesn't come from a macro.
478 bool hasMacro = false;
479 for (unsigned i = 0; i < numConcat ; ++i)
480 if (SL->getStrTokenLoc(i).isMacroID()) {
485 S.Diag(Element->getBeginLoc(),
486 diag::warn_concatenated_nsarray_literal)
487 << Element->getType();
492 // Make sure that the element has the type that the container factory
494 return S.PerformCopyInitialization(
495 InitializedEntity::InitializeParameter(S.Context, T,
497 Element->getBeginLoc(), Element);
500 ExprResult Sema::BuildObjCBoxedExpr(SourceRange SR, Expr *ValueExpr) {
501 if (ValueExpr->isTypeDependent()) {
502 ObjCBoxedExpr *BoxedExpr =
503 new (Context) ObjCBoxedExpr(ValueExpr, Context.DependentTy, nullptr, SR);
506 ObjCMethodDecl *BoxingMethod = nullptr;
508 // Convert the expression to an RValue, so we can check for pointer types...
509 ExprResult RValue = DefaultFunctionArrayLvalueConversion(ValueExpr);
510 if (RValue.isInvalid()) {
513 SourceLocation Loc = SR.getBegin();
514 ValueExpr = RValue.get();
515 QualType ValueType(ValueExpr->getType());
516 if (const PointerType *PT = ValueType->getAs<PointerType>()) {
517 QualType PointeeType = PT->getPointeeType();
518 if (Context.hasSameUnqualifiedType(PointeeType, Context.CharTy)) {
521 NSStringDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
526 QualType NSStringObject = Context.getObjCInterfaceType(NSStringDecl);
527 NSStringPointer = Context.getObjCObjectPointerType(NSStringObject);
530 // The boxed expression can be emitted as a compile time constant if it is
531 // a string literal whose character encoding is compatible with UTF-8.
532 if (auto *CE = dyn_cast<ImplicitCastExpr>(ValueExpr))
533 if (CE->getCastKind() == CK_ArrayToPointerDecay)
535 dyn_cast<StringLiteral>(CE->getSubExpr()->IgnoreParens())) {
536 assert((SL->isAscii() || SL->isUTF8()) &&
537 "unexpected character encoding");
538 StringRef Str = SL->getString();
539 const llvm::UTF8 *StrBegin = Str.bytes_begin();
540 const llvm::UTF8 *StrEnd = Str.bytes_end();
541 // Check that this is a valid UTF-8 string.
542 if (llvm::isLegalUTF8String(&StrBegin, StrEnd)) {
543 BoxedType = Context.getAttributedType(
544 AttributedType::getNullabilityAttrKind(
545 NullabilityKind::NonNull),
546 NSStringPointer, NSStringPointer);
547 return new (Context) ObjCBoxedExpr(CE, BoxedType, nullptr, SR);
550 Diag(SL->getBeginLoc(), diag::warn_objc_boxing_invalid_utf8_string)
551 << NSStringPointer << SL->getSourceRange();
554 if (!StringWithUTF8StringMethod) {
555 IdentifierInfo *II = &Context.Idents.get("stringWithUTF8String");
556 Selector stringWithUTF8String = Context.Selectors.getUnarySelector(II);
558 // Look for the appropriate method within NSString.
559 BoxingMethod = NSStringDecl->lookupClassMethod(stringWithUTF8String);
560 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
561 // Debugger needs to work even if NSString hasn't been defined.
562 TypeSourceInfo *ReturnTInfo = nullptr;
563 ObjCMethodDecl *M = ObjCMethodDecl::Create(
564 Context, SourceLocation(), SourceLocation(), stringWithUTF8String,
565 NSStringPointer, ReturnTInfo, NSStringDecl,
566 /*isInstance=*/false, /*isVariadic=*/false,
567 /*isPropertyAccessor=*/false,
568 /*isSynthesizedAccessorStub=*/false,
569 /*isImplicitlyDeclared=*/true,
570 /*isDefined=*/false, ObjCMethodDecl::Required,
571 /*HasRelatedResultType=*/false);
572 QualType ConstCharType = Context.CharTy.withConst();
574 ParmVarDecl::Create(Context, M,
575 SourceLocation(), SourceLocation(),
576 &Context.Idents.get("value"),
577 Context.getPointerType(ConstCharType),
580 M->setMethodParams(Context, value, None);
584 if (!validateBoxingMethod(*this, Loc, NSStringDecl,
585 stringWithUTF8String, BoxingMethod))
588 StringWithUTF8StringMethod = BoxingMethod;
591 BoxingMethod = StringWithUTF8StringMethod;
592 BoxedType = NSStringPointer;
593 // Transfer the nullability from method's return type.
594 Optional<NullabilityKind> Nullability =
595 BoxingMethod->getReturnType()->getNullability(Context);
597 BoxedType = Context.getAttributedType(
598 AttributedType::getNullabilityAttrKind(*Nullability), BoxedType,
601 } else if (ValueType->isBuiltinType()) {
602 // The other types we support are numeric, char and BOOL/bool. We could also
603 // provide limited support for structure types, such as NSRange, NSRect, and
604 // NSSize. See NSValue (NSValueGeometryExtensions) in <Foundation/NSGeometry.h>
607 // Check for a top-level character literal.
608 if (const CharacterLiteral *Char =
609 dyn_cast<CharacterLiteral>(ValueExpr->IgnoreParens())) {
610 // In C, character literals have type 'int'. That's not the type we want
611 // to use to determine the Objective-c literal kind.
612 switch (Char->getKind()) {
613 case CharacterLiteral::Ascii:
614 case CharacterLiteral::UTF8:
615 ValueType = Context.CharTy;
618 case CharacterLiteral::Wide:
619 ValueType = Context.getWideCharType();
622 case CharacterLiteral::UTF16:
623 ValueType = Context.Char16Ty;
626 case CharacterLiteral::UTF32:
627 ValueType = Context.Char32Ty;
631 // FIXME: Do I need to do anything special with BoolTy expressions?
633 // Look for the appropriate method within NSNumber.
634 BoxingMethod = getNSNumberFactoryMethod(*this, Loc, ValueType);
635 BoxedType = NSNumberPointer;
636 } else if (const EnumType *ET = ValueType->getAs<EnumType>()) {
637 if (!ET->getDecl()->isComplete()) {
638 Diag(Loc, diag::err_objc_incomplete_boxed_expression_type)
639 << ValueType << ValueExpr->getSourceRange();
643 BoxingMethod = getNSNumberFactoryMethod(*this, Loc,
644 ET->getDecl()->getIntegerType());
645 BoxedType = NSNumberPointer;
646 } else if (ValueType->isObjCBoxableRecordType()) {
647 // Support for structure types, that marked as objc_boxable
648 // struct __attribute__((objc_boxable)) s { ... };
650 // Look up the NSValue class, if we haven't done so already. It's cached
651 // in the Sema instance.
653 NSValueDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
659 // generate the pointer to NSValue type.
660 QualType NSValueObject = Context.getObjCInterfaceType(NSValueDecl);
661 NSValuePointer = Context.getObjCObjectPointerType(NSValueObject);
664 if (!ValueWithBytesObjCTypeMethod) {
665 IdentifierInfo *II[] = {
666 &Context.Idents.get("valueWithBytes"),
667 &Context.Idents.get("objCType")
669 Selector ValueWithBytesObjCType = Context.Selectors.getSelector(2, II);
671 // Look for the appropriate method within NSValue.
672 BoxingMethod = NSValueDecl->lookupClassMethod(ValueWithBytesObjCType);
673 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
674 // Debugger needs to work even if NSValue hasn't been defined.
675 TypeSourceInfo *ReturnTInfo = nullptr;
676 ObjCMethodDecl *M = ObjCMethodDecl::Create(
677 Context, SourceLocation(), SourceLocation(), ValueWithBytesObjCType,
678 NSValuePointer, ReturnTInfo, NSValueDecl,
679 /*isInstance=*/false,
680 /*isVariadic=*/false,
681 /*isPropertyAccessor=*/false,
682 /*isSynthesizedAccessorStub=*/false,
683 /*isImplicitlyDeclared=*/true,
684 /*isDefined=*/false, ObjCMethodDecl::Required,
685 /*HasRelatedResultType=*/false);
687 SmallVector<ParmVarDecl *, 2> Params;
690 ParmVarDecl::Create(Context, M,
691 SourceLocation(), SourceLocation(),
692 &Context.Idents.get("bytes"),
693 Context.VoidPtrTy.withConst(),
696 Params.push_back(bytes);
698 QualType ConstCharType = Context.CharTy.withConst();
700 ParmVarDecl::Create(Context, M,
701 SourceLocation(), SourceLocation(),
702 &Context.Idents.get("type"),
703 Context.getPointerType(ConstCharType),
706 Params.push_back(type);
708 M->setMethodParams(Context, Params, None);
712 if (!validateBoxingMethod(*this, Loc, NSValueDecl,
713 ValueWithBytesObjCType, BoxingMethod))
716 ValueWithBytesObjCTypeMethod = BoxingMethod;
719 if (!ValueType.isTriviallyCopyableType(Context)) {
720 Diag(Loc, diag::err_objc_non_trivially_copyable_boxed_expression_type)
721 << ValueType << ValueExpr->getSourceRange();
725 BoxingMethod = ValueWithBytesObjCTypeMethod;
726 BoxedType = NSValuePointer;
730 Diag(Loc, diag::err_objc_illegal_boxed_expression_type)
731 << ValueType << ValueExpr->getSourceRange();
735 DiagnoseUseOfDecl(BoxingMethod, Loc);
737 ExprResult ConvertedValueExpr;
738 if (ValueType->isObjCBoxableRecordType()) {
739 InitializedEntity IE = InitializedEntity::InitializeTemporary(ValueType);
740 ConvertedValueExpr = PerformCopyInitialization(IE, ValueExpr->getExprLoc(),
743 // Convert the expression to the type that the parameter requires.
744 ParmVarDecl *ParamDecl = BoxingMethod->parameters()[0];
745 InitializedEntity IE = InitializedEntity::InitializeParameter(Context,
747 ConvertedValueExpr = PerformCopyInitialization(IE, SourceLocation(),
751 if (ConvertedValueExpr.isInvalid())
753 ValueExpr = ConvertedValueExpr.get();
755 ObjCBoxedExpr *BoxedExpr =
756 new (Context) ObjCBoxedExpr(ValueExpr, BoxedType,
758 return MaybeBindToTemporary(BoxedExpr);
761 /// Build an ObjC subscript pseudo-object expression, given that
762 /// that's supported by the runtime.
763 ExprResult Sema::BuildObjCSubscriptExpression(SourceLocation RB, Expr *BaseExpr,
765 ObjCMethodDecl *getterMethod,
766 ObjCMethodDecl *setterMethod) {
767 assert(!LangOpts.isSubscriptPointerArithmetic());
769 // We can't get dependent types here; our callers should have
770 // filtered them out.
771 assert((!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) &&
772 "base or index cannot have dependent type here");
774 // Filter out placeholders in the index. In theory, overloads could
775 // be preserved here, although that might not actually work correctly.
776 ExprResult Result = CheckPlaceholderExpr(IndexExpr);
777 if (Result.isInvalid())
779 IndexExpr = Result.get();
781 // Perform lvalue-to-rvalue conversion on the base.
782 Result = DefaultLvalueConversion(BaseExpr);
783 if (Result.isInvalid())
785 BaseExpr = Result.get();
787 // Build the pseudo-object expression.
788 return new (Context) ObjCSubscriptRefExpr(
789 BaseExpr, IndexExpr, Context.PseudoObjectTy, VK_LValue, OK_ObjCSubscript,
790 getterMethod, setterMethod, RB);
793 ExprResult Sema::BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements) {
794 SourceLocation Loc = SR.getBegin();
797 NSArrayDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
804 // Find the arrayWithObjects:count: method, if we haven't done so already.
805 QualType IdT = Context.getObjCIdType();
806 if (!ArrayWithObjectsMethod) {
808 Sel = NSAPIObj->getNSArraySelector(NSAPI::NSArr_arrayWithObjectsCount);
809 ObjCMethodDecl *Method = NSArrayDecl->lookupClassMethod(Sel);
810 if (!Method && getLangOpts().DebuggerObjCLiteral) {
811 TypeSourceInfo *ReturnTInfo = nullptr;
812 Method = ObjCMethodDecl::Create(
813 Context, SourceLocation(), SourceLocation(), Sel, IdT, ReturnTInfo,
814 Context.getTranslationUnitDecl(), false /*Instance*/,
815 false /*isVariadic*/,
816 /*isPropertyAccessor=*/false, /*isSynthesizedAccessorStub=*/false,
817 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
818 ObjCMethodDecl::Required, false);
819 SmallVector<ParmVarDecl *, 2> Params;
820 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
823 &Context.Idents.get("objects"),
824 Context.getPointerType(IdT),
827 Params.push_back(objects);
828 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
831 &Context.Idents.get("cnt"),
832 Context.UnsignedLongTy,
833 /*TInfo=*/nullptr, SC_None,
835 Params.push_back(cnt);
836 Method->setMethodParams(Context, Params, None);
839 if (!validateBoxingMethod(*this, Loc, NSArrayDecl, Sel, Method))
842 // Dig out the type that all elements should be converted to.
843 QualType T = Method->parameters()[0]->getType();
844 const PointerType *PtrT = T->getAs<PointerType>();
846 !Context.hasSameUnqualifiedType(PtrT->getPointeeType(), IdT)) {
847 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
849 Diag(Method->parameters()[0]->getLocation(),
850 diag::note_objc_literal_method_param)
852 << Context.getPointerType(IdT.withConst());
856 // Check that the 'count' parameter is integral.
857 if (!Method->parameters()[1]->getType()->isIntegerType()) {
858 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
860 Diag(Method->parameters()[1]->getLocation(),
861 diag::note_objc_literal_method_param)
863 << Method->parameters()[1]->getType()
868 // We've found a good +arrayWithObjects:count: method. Save it!
869 ArrayWithObjectsMethod = Method;
872 QualType ObjectsType = ArrayWithObjectsMethod->parameters()[0]->getType();
873 QualType RequiredType = ObjectsType->castAs<PointerType>()->getPointeeType();
875 // Check that each of the elements provided is valid in a collection literal,
876 // performing conversions as necessary.
877 Expr **ElementsBuffer = Elements.data();
878 for (unsigned I = 0, N = Elements.size(); I != N; ++I) {
879 ExprResult Converted = CheckObjCCollectionLiteralElement(*this,
882 if (Converted.isInvalid())
885 ElementsBuffer[I] = Converted.get();
889 = Context.getObjCObjectPointerType(
890 Context.getObjCInterfaceType(NSArrayDecl));
892 return MaybeBindToTemporary(
893 ObjCArrayLiteral::Create(Context, Elements, Ty,
894 ArrayWithObjectsMethod, SR));
897 ExprResult Sema::BuildObjCDictionaryLiteral(SourceRange SR,
898 MutableArrayRef<ObjCDictionaryElement> Elements) {
899 SourceLocation Loc = SR.getBegin();
901 if (!NSDictionaryDecl) {
902 NSDictionaryDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
903 Sema::LK_Dictionary);
904 if (!NSDictionaryDecl) {
909 // Find the dictionaryWithObjects:forKeys:count: method, if we haven't done
911 QualType IdT = Context.getObjCIdType();
912 if (!DictionaryWithObjectsMethod) {
913 Selector Sel = NSAPIObj->getNSDictionarySelector(
914 NSAPI::NSDict_dictionaryWithObjectsForKeysCount);
915 ObjCMethodDecl *Method = NSDictionaryDecl->lookupClassMethod(Sel);
916 if (!Method && getLangOpts().DebuggerObjCLiteral) {
917 Method = ObjCMethodDecl::Create(
918 Context, SourceLocation(), SourceLocation(), Sel, IdT,
919 nullptr /*TypeSourceInfo */, Context.getTranslationUnitDecl(),
920 false /*Instance*/, false /*isVariadic*/,
921 /*isPropertyAccessor=*/false,
922 /*isSynthesizedAccessorStub=*/false,
923 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
924 ObjCMethodDecl::Required, false);
925 SmallVector<ParmVarDecl *, 3> Params;
926 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
929 &Context.Idents.get("objects"),
930 Context.getPointerType(IdT),
931 /*TInfo=*/nullptr, SC_None,
933 Params.push_back(objects);
934 ParmVarDecl *keys = ParmVarDecl::Create(Context, Method,
937 &Context.Idents.get("keys"),
938 Context.getPointerType(IdT),
939 /*TInfo=*/nullptr, SC_None,
941 Params.push_back(keys);
942 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
945 &Context.Idents.get("cnt"),
946 Context.UnsignedLongTy,
947 /*TInfo=*/nullptr, SC_None,
949 Params.push_back(cnt);
950 Method->setMethodParams(Context, Params, None);
953 if (!validateBoxingMethod(*this, SR.getBegin(), NSDictionaryDecl, Sel,
957 // Dig out the type that all values should be converted to.
958 QualType ValueT = Method->parameters()[0]->getType();
959 const PointerType *PtrValue = ValueT->getAs<PointerType>();
961 !Context.hasSameUnqualifiedType(PtrValue->getPointeeType(), IdT)) {
962 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
964 Diag(Method->parameters()[0]->getLocation(),
965 diag::note_objc_literal_method_param)
967 << Context.getPointerType(IdT.withConst());
971 // Dig out the type that all keys should be converted to.
972 QualType KeyT = Method->parameters()[1]->getType();
973 const PointerType *PtrKey = KeyT->getAs<PointerType>();
975 !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
979 if (QIDNSCopying.isNull()) {
980 // key argument of selector is id<NSCopying>?
981 if (ObjCProtocolDecl *NSCopyingPDecl =
982 LookupProtocol(&Context.Idents.get("NSCopying"), SR.getBegin())) {
983 ObjCProtocolDecl *PQ[] = {NSCopyingPDecl};
985 Context.getObjCObjectType(Context.ObjCBuiltinIdTy, { },
987 (ObjCProtocolDecl**) PQ,
990 QIDNSCopying = Context.getObjCObjectPointerType(QIDNSCopying);
993 if (!QIDNSCopying.isNull())
994 err = !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
999 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
1001 Diag(Method->parameters()[1]->getLocation(),
1002 diag::note_objc_literal_method_param)
1004 << Context.getPointerType(IdT.withConst());
1009 // Check that the 'count' parameter is integral.
1010 QualType CountType = Method->parameters()[2]->getType();
1011 if (!CountType->isIntegerType()) {
1012 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
1014 Diag(Method->parameters()[2]->getLocation(),
1015 diag::note_objc_literal_method_param)
1021 // We've found a good +dictionaryWithObjects:keys:count: method; save it!
1022 DictionaryWithObjectsMethod = Method;
1025 QualType ValuesT = DictionaryWithObjectsMethod->parameters()[0]->getType();
1026 QualType ValueT = ValuesT->castAs<PointerType>()->getPointeeType();
1027 QualType KeysT = DictionaryWithObjectsMethod->parameters()[1]->getType();
1028 QualType KeyT = KeysT->castAs<PointerType>()->getPointeeType();
1030 // Check that each of the keys and values provided is valid in a collection
1031 // literal, performing conversions as necessary.
1032 bool HasPackExpansions = false;
1033 for (ObjCDictionaryElement &Element : Elements) {
1035 ExprResult Key = CheckObjCCollectionLiteralElement(*this, Element.Key,
1037 if (Key.isInvalid())
1042 = CheckObjCCollectionLiteralElement(*this, Element.Value, ValueT);
1043 if (Value.isInvalid())
1046 Element.Key = Key.get();
1047 Element.Value = Value.get();
1049 if (Element.EllipsisLoc.isInvalid())
1052 if (!Element.Key->containsUnexpandedParameterPack() &&
1053 !Element.Value->containsUnexpandedParameterPack()) {
1054 Diag(Element.EllipsisLoc,
1055 diag::err_pack_expansion_without_parameter_packs)
1056 << SourceRange(Element.Key->getBeginLoc(),
1057 Element.Value->getEndLoc());
1061 HasPackExpansions = true;
1065 = Context.getObjCObjectPointerType(
1066 Context.getObjCInterfaceType(NSDictionaryDecl));
1067 return MaybeBindToTemporary(ObjCDictionaryLiteral::Create(
1068 Context, Elements, HasPackExpansions, Ty,
1069 DictionaryWithObjectsMethod, SR));
1072 ExprResult Sema::BuildObjCEncodeExpression(SourceLocation AtLoc,
1073 TypeSourceInfo *EncodedTypeInfo,
1074 SourceLocation RParenLoc) {
1075 QualType EncodedType = EncodedTypeInfo->getType();
1077 if (EncodedType->isDependentType())
1078 StrTy = Context.DependentTy;
1080 if (!EncodedType->getAsArrayTypeUnsafe() && //// Incomplete array is handled.
1081 !EncodedType->isVoidType()) // void is handled too.
1082 if (RequireCompleteType(AtLoc, EncodedType,
1083 diag::err_incomplete_type_objc_at_encode,
1084 EncodedTypeInfo->getTypeLoc()))
1088 QualType NotEncodedT;
1089 Context.getObjCEncodingForType(EncodedType, Str, nullptr, &NotEncodedT);
1090 if (!NotEncodedT.isNull())
1091 Diag(AtLoc, diag::warn_incomplete_encoded_type)
1092 << EncodedType << NotEncodedT;
1094 // The type of @encode is the same as the type of the corresponding string,
1095 // which is an array type.
1096 StrTy = Context.getStringLiteralArrayType(Context.CharTy, Str.size());
1099 return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc);
1102 ExprResult Sema::ParseObjCEncodeExpression(SourceLocation AtLoc,
1103 SourceLocation EncodeLoc,
1104 SourceLocation LParenLoc,
1106 SourceLocation RParenLoc) {
1107 // FIXME: Preserve type source info ?
1108 TypeSourceInfo *TInfo;
1109 QualType EncodedType = GetTypeFromParser(ty, &TInfo);
1111 TInfo = Context.getTrivialTypeSourceInfo(EncodedType,
1112 getLocForEndOfToken(LParenLoc));
1114 return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc);
1117 static bool HelperToDiagnoseMismatchedMethodsInGlobalPool(Sema &S,
1118 SourceLocation AtLoc,
1119 SourceLocation LParenLoc,
1120 SourceLocation RParenLoc,
1121 ObjCMethodDecl *Method,
1122 ObjCMethodList &MethList) {
1123 ObjCMethodList *M = &MethList;
1124 bool Warned = false;
1125 for (M = M->getNext(); M; M=M->getNext()) {
1126 ObjCMethodDecl *MatchingMethodDecl = M->getMethod();
1127 if (MatchingMethodDecl == Method ||
1128 isa<ObjCImplDecl>(MatchingMethodDecl->getDeclContext()) ||
1129 MatchingMethodDecl->getSelector() != Method->getSelector())
1131 if (!S.MatchTwoMethodDeclarations(Method,
1132 MatchingMethodDecl, Sema::MMS_loose)) {
1135 S.Diag(AtLoc, diag::warn_multiple_selectors)
1136 << Method->getSelector() << FixItHint::CreateInsertion(LParenLoc, "(")
1137 << FixItHint::CreateInsertion(RParenLoc, ")");
1138 S.Diag(Method->getLocation(), diag::note_method_declared_at)
1139 << Method->getDeclName();
1141 S.Diag(MatchingMethodDecl->getLocation(), diag::note_method_declared_at)
1142 << MatchingMethodDecl->getDeclName();
1148 static void DiagnoseMismatchedSelectors(Sema &S, SourceLocation AtLoc,
1149 ObjCMethodDecl *Method,
1150 SourceLocation LParenLoc,
1151 SourceLocation RParenLoc,
1152 bool WarnMultipleSelectors) {
1153 if (!WarnMultipleSelectors ||
1154 S.Diags.isIgnored(diag::warn_multiple_selectors, SourceLocation()))
1156 bool Warned = false;
1157 for (Sema::GlobalMethodPool::iterator b = S.MethodPool.begin(),
1158 e = S.MethodPool.end(); b != e; b++) {
1159 // first, instance methods
1160 ObjCMethodList &InstMethList = b->second.first;
1161 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1162 Method, InstMethList))
1165 // second, class methods
1166 ObjCMethodList &ClsMethList = b->second.second;
1167 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1168 Method, ClsMethList) || Warned)
1173 static void HelperToDiagnoseDirectSelectorsExpr(Sema &S, SourceLocation AtLoc,
1175 ObjCMethodList &MethList,
1177 ObjCMethodList *M = &MethList;
1178 for (M = M->getNext(); M; M = M->getNext()) {
1179 ObjCMethodDecl *Method = M->getMethod();
1180 if (Method->getSelector() != Sel)
1182 if (!Method->isDirectMethod())
1187 static void DiagnoseDirectSelectorsExpr(Sema &S, SourceLocation AtLoc,
1188 Selector Sel, bool &onlyDirect) {
1189 for (Sema::GlobalMethodPool::iterator b = S.MethodPool.begin(),
1190 e = S.MethodPool.end(); b != e; b++) {
1191 // first, instance methods
1192 ObjCMethodList &InstMethList = b->second.first;
1193 HelperToDiagnoseDirectSelectorsExpr(S, AtLoc, Sel, InstMethList,
1196 // second, class methods
1197 ObjCMethodList &ClsMethList = b->second.second;
1198 HelperToDiagnoseDirectSelectorsExpr(S, AtLoc, Sel, ClsMethList, onlyDirect);
1202 ExprResult Sema::ParseObjCSelectorExpression(Selector Sel,
1203 SourceLocation AtLoc,
1204 SourceLocation SelLoc,
1205 SourceLocation LParenLoc,
1206 SourceLocation RParenLoc,
1207 bool WarnMultipleSelectors) {
1208 ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel,
1209 SourceRange(LParenLoc, RParenLoc));
1211 Method = LookupFactoryMethodInGlobalPool(Sel,
1212 SourceRange(LParenLoc, RParenLoc));
1214 if (const ObjCMethodDecl *OM = SelectorsForTypoCorrection(Sel)) {
1215 Selector MatchedSel = OM->getSelector();
1216 SourceRange SelectorRange(LParenLoc.getLocWithOffset(1),
1217 RParenLoc.getLocWithOffset(-1));
1218 Diag(SelLoc, diag::warn_undeclared_selector_with_typo)
1219 << Sel << MatchedSel
1220 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1223 Diag(SelLoc, diag::warn_undeclared_selector) << Sel;
1225 bool onlyDirect = Method->isDirectMethod();
1226 DiagnoseDirectSelectorsExpr(*this, AtLoc, Sel, onlyDirect);
1227 DiagnoseMismatchedSelectors(*this, AtLoc, Method, LParenLoc, RParenLoc,
1228 WarnMultipleSelectors);
1230 Diag(AtLoc, diag::err_direct_selector_expression)
1231 << Method->getSelector();
1232 Diag(Method->getLocation(), diag::note_direct_method_declared_at)
1233 << Method->getDeclName();
1238 Method->getImplementationControl() != ObjCMethodDecl::Optional &&
1239 !getSourceManager().isInSystemHeader(Method->getLocation()))
1240 ReferencedSelectors.insert(std::make_pair(Sel, AtLoc));
1242 // In ARC, forbid the user from using @selector for
1243 // retain/release/autorelease/dealloc/retainCount.
1244 if (getLangOpts().ObjCAutoRefCount) {
1245 switch (Sel.getMethodFamily()) {
1248 case OMF_autorelease:
1249 case OMF_retainCount:
1251 Diag(AtLoc, diag::err_arc_illegal_selector) <<
1252 Sel << SourceRange(LParenLoc, RParenLoc);
1260 case OMF_mutableCopy:
1263 case OMF_initialize:
1264 case OMF_performSelector:
1268 QualType Ty = Context.getObjCSelType();
1269 return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc);
1272 ExprResult Sema::ParseObjCProtocolExpression(IdentifierInfo *ProtocolId,
1273 SourceLocation AtLoc,
1274 SourceLocation ProtoLoc,
1275 SourceLocation LParenLoc,
1276 SourceLocation ProtoIdLoc,
1277 SourceLocation RParenLoc) {
1278 ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoIdLoc);
1280 Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId;
1283 if (!PDecl->hasDefinition()) {
1284 Diag(ProtoLoc, diag::err_atprotocol_protocol) << PDecl;
1285 Diag(PDecl->getLocation(), diag::note_entity_declared_at) << PDecl;
1287 PDecl = PDecl->getDefinition();
1290 QualType Ty = Context.getObjCProtoType();
1293 Ty = Context.getObjCObjectPointerType(Ty);
1294 return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, ProtoIdLoc, RParenLoc);
1297 /// Try to capture an implicit reference to 'self'.
1298 ObjCMethodDecl *Sema::tryCaptureObjCSelf(SourceLocation Loc) {
1299 DeclContext *DC = getFunctionLevelDeclContext();
1301 // If we're not in an ObjC method, error out. Note that, unlike the
1302 // C++ case, we don't require an instance method --- class methods
1303 // still have a 'self', and we really do still need to capture it!
1304 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(DC);
1308 tryCaptureVariable(method->getSelfDecl(), Loc);
1313 static QualType stripObjCInstanceType(ASTContext &Context, QualType T) {
1314 QualType origType = T;
1315 if (auto nullability = AttributedType::stripOuterNullability(T)) {
1316 if (T == Context.getObjCInstanceType()) {
1317 return Context.getAttributedType(
1318 AttributedType::getNullabilityAttrKind(*nullability),
1319 Context.getObjCIdType(),
1320 Context.getObjCIdType());
1326 if (T == Context.getObjCInstanceType())
1327 return Context.getObjCIdType();
1332 /// Determine the result type of a message send based on the receiver type,
1333 /// method, and the kind of message send.
1335 /// This is the "base" result type, which will still need to be adjusted
1336 /// to account for nullability.
1337 static QualType getBaseMessageSendResultType(Sema &S,
1338 QualType ReceiverType,
1339 ObjCMethodDecl *Method,
1340 bool isClassMessage,
1341 bool isSuperMessage) {
1342 assert(Method && "Must have a method");
1343 if (!Method->hasRelatedResultType())
1344 return Method->getSendResultType(ReceiverType);
1346 ASTContext &Context = S.Context;
1348 // Local function that transfers the nullability of the method's
1349 // result type to the returned result.
1350 auto transferNullability = [&](QualType type) -> QualType {
1351 // If the method's result type has nullability, extract it.
1352 if (auto nullability = Method->getSendResultType(ReceiverType)
1353 ->getNullability(Context)){
1354 // Strip off any outer nullability sugar from the provided type.
1355 (void)AttributedType::stripOuterNullability(type);
1357 // Form a new attributed type using the method result type's nullability.
1358 return Context.getAttributedType(
1359 AttributedType::getNullabilityAttrKind(*nullability),
1367 // If a method has a related return type:
1368 // - if the method found is an instance method, but the message send
1369 // was a class message send, T is the declared return type of the method
1371 if (Method->isInstanceMethod() && isClassMessage)
1372 return stripObjCInstanceType(Context,
1373 Method->getSendResultType(ReceiverType));
1375 // - if the receiver is super, T is a pointer to the class of the
1376 // enclosing method definition
1377 if (isSuperMessage) {
1378 if (ObjCMethodDecl *CurMethod = S.getCurMethodDecl())
1379 if (ObjCInterfaceDecl *Class = CurMethod->getClassInterface()) {
1380 return transferNullability(
1381 Context.getObjCObjectPointerType(
1382 Context.getObjCInterfaceType(Class)));
1386 // - if the receiver is the name of a class U, T is a pointer to U
1387 if (ReceiverType->getAsObjCInterfaceType())
1388 return transferNullability(Context.getObjCObjectPointerType(ReceiverType));
1389 // - if the receiver is of type Class or qualified Class type,
1390 // T is the declared return type of the method.
1391 if (ReceiverType->isObjCClassType() ||
1392 ReceiverType->isObjCQualifiedClassType())
1393 return stripObjCInstanceType(Context,
1394 Method->getSendResultType(ReceiverType));
1396 // - if the receiver is id, qualified id, Class, or qualified Class, T
1397 // is the receiver type, otherwise
1398 // - T is the type of the receiver expression.
1399 return transferNullability(ReceiverType);
1402 QualType Sema::getMessageSendResultType(const Expr *Receiver,
1403 QualType ReceiverType,
1404 ObjCMethodDecl *Method,
1405 bool isClassMessage,
1406 bool isSuperMessage) {
1407 // Produce the result type.
1408 QualType resultType = getBaseMessageSendResultType(*this, ReceiverType,
1413 // If this is a class message, ignore the nullability of the receiver.
1414 if (isClassMessage) {
1415 // In a class method, class messages to 'self' that return instancetype can
1416 // be typed as the current class. We can safely do this in ARC because self
1417 // can't be reassigned, and we do it unsafely outside of ARC because in
1418 // practice people never reassign self in class methods and there's some
1419 // virtue in not being aggressively pedantic.
1420 if (Receiver && Receiver->isObjCSelfExpr()) {
1421 assert(ReceiverType->isObjCClassType() && "expected a Class self");
1422 QualType T = Method->getSendResultType(ReceiverType);
1423 AttributedType::stripOuterNullability(T);
1424 if (T == Context.getObjCInstanceType()) {
1425 const ObjCMethodDecl *MD = cast<ObjCMethodDecl>(
1426 cast<ImplicitParamDecl>(
1427 cast<DeclRefExpr>(Receiver->IgnoreParenImpCasts())->getDecl())
1428 ->getDeclContext());
1429 assert(MD->isClassMethod() && "expected a class method");
1430 QualType NewResultType = Context.getObjCObjectPointerType(
1431 Context.getObjCInterfaceType(MD->getClassInterface()));
1432 if (auto Nullability = resultType->getNullability(Context))
1433 NewResultType = Context.getAttributedType(
1434 AttributedType::getNullabilityAttrKind(*Nullability),
1435 NewResultType, NewResultType);
1436 return NewResultType;
1442 // There is nothing left to do if the result type cannot have a nullability
1444 if (!resultType->canHaveNullability())
1447 // Map the nullability of the result into a table index.
1448 unsigned receiverNullabilityIdx = 0;
1449 if (auto nullability = ReceiverType->getNullability(Context))
1450 receiverNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1452 unsigned resultNullabilityIdx = 0;
1453 if (auto nullability = resultType->getNullability(Context))
1454 resultNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1456 // The table of nullability mappings, indexed by the receiver's nullability
1457 // and then the result type's nullability.
1458 static const uint8_t None = 0;
1459 static const uint8_t NonNull = 1;
1460 static const uint8_t Nullable = 2;
1461 static const uint8_t Unspecified = 3;
1462 static const uint8_t nullabilityMap[4][4] = {
1463 // None NonNull Nullable Unspecified
1464 /* None */ { None, None, Nullable, None },
1465 /* NonNull */ { None, NonNull, Nullable, Unspecified },
1466 /* Nullable */ { Nullable, Nullable, Nullable, Nullable },
1467 /* Unspecified */ { None, Unspecified, Nullable, Unspecified }
1470 unsigned newResultNullabilityIdx
1471 = nullabilityMap[receiverNullabilityIdx][resultNullabilityIdx];
1472 if (newResultNullabilityIdx == resultNullabilityIdx)
1475 // Strip off the existing nullability. This removes as little type sugar as
1478 if (auto attributed = dyn_cast<AttributedType>(resultType.getTypePtr())) {
1479 resultType = attributed->getModifiedType();
1481 resultType = resultType.getDesugaredType(Context);
1483 } while (resultType->getNullability(Context));
1485 // Add nullability back if needed.
1486 if (newResultNullabilityIdx > 0) {
1488 = static_cast<NullabilityKind>(newResultNullabilityIdx-1);
1489 return Context.getAttributedType(
1490 AttributedType::getNullabilityAttrKind(newNullability),
1491 resultType, resultType);
1497 /// Look for an ObjC method whose result type exactly matches the given type.
1498 static const ObjCMethodDecl *
1499 findExplicitInstancetypeDeclarer(const ObjCMethodDecl *MD,
1500 QualType instancetype) {
1501 if (MD->getReturnType() == instancetype)
1504 // For these purposes, a method in an @implementation overrides a
1505 // declaration in the @interface.
1506 if (const ObjCImplDecl *impl =
1507 dyn_cast<ObjCImplDecl>(MD->getDeclContext())) {
1508 const ObjCContainerDecl *iface;
1509 if (const ObjCCategoryImplDecl *catImpl =
1510 dyn_cast<ObjCCategoryImplDecl>(impl)) {
1511 iface = catImpl->getCategoryDecl();
1513 iface = impl->getClassInterface();
1516 const ObjCMethodDecl *ifaceMD =
1517 iface->getMethod(MD->getSelector(), MD->isInstanceMethod());
1518 if (ifaceMD) return findExplicitInstancetypeDeclarer(ifaceMD, instancetype);
1521 SmallVector<const ObjCMethodDecl *, 4> overrides;
1522 MD->getOverriddenMethods(overrides);
1523 for (unsigned i = 0, e = overrides.size(); i != e; ++i) {
1524 if (const ObjCMethodDecl *result =
1525 findExplicitInstancetypeDeclarer(overrides[i], instancetype))
1532 void Sema::EmitRelatedResultTypeNoteForReturn(QualType destType) {
1533 // Only complain if we're in an ObjC method and the required return
1534 // type doesn't match the method's declared return type.
1535 ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurContext);
1536 if (!MD || !MD->hasRelatedResultType() ||
1537 Context.hasSameUnqualifiedType(destType, MD->getReturnType()))
1540 // Look for a method overridden by this method which explicitly uses
1542 if (const ObjCMethodDecl *overridden =
1543 findExplicitInstancetypeDeclarer(MD, Context.getObjCInstanceType())) {
1544 SourceRange range = overridden->getReturnTypeSourceRange();
1545 SourceLocation loc = range.getBegin();
1546 if (loc.isInvalid())
1547 loc = overridden->getLocation();
1548 Diag(loc, diag::note_related_result_type_explicit)
1549 << /*current method*/ 1 << range;
1553 // Otherwise, if we have an interesting method family, note that.
1554 // This should always trigger if the above didn't.
1555 if (ObjCMethodFamily family = MD->getMethodFamily())
1556 Diag(MD->getLocation(), diag::note_related_result_type_family)
1557 << /*current method*/ 1
1561 void Sema::EmitRelatedResultTypeNote(const Expr *E) {
1562 E = E->IgnoreParenImpCasts();
1563 const ObjCMessageExpr *MsgSend = dyn_cast<ObjCMessageExpr>(E);
1567 const ObjCMethodDecl *Method = MsgSend->getMethodDecl();
1571 if (!Method->hasRelatedResultType())
1574 if (Context.hasSameUnqualifiedType(
1575 Method->getReturnType().getNonReferenceType(), MsgSend->getType()))
1578 if (!Context.hasSameUnqualifiedType(Method->getReturnType(),
1579 Context.getObjCInstanceType()))
1582 Diag(Method->getLocation(), diag::note_related_result_type_inferred)
1583 << Method->isInstanceMethod() << Method->getSelector()
1584 << MsgSend->getType();
1587 bool Sema::CheckMessageArgumentTypes(
1588 const Expr *Receiver, QualType ReceiverType, MultiExprArg Args,
1589 Selector Sel, ArrayRef<SourceLocation> SelectorLocs, ObjCMethodDecl *Method,
1590 bool isClassMessage, bool isSuperMessage, SourceLocation lbrac,
1591 SourceLocation rbrac, SourceRange RecRange, QualType &ReturnType,
1592 ExprValueKind &VK) {
1593 SourceLocation SelLoc;
1594 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
1595 SelLoc = SelectorLocs.front();
1600 // Apply default argument promotion as for (C99 6.5.2.2p6).
1601 for (unsigned i = 0, e = Args.size(); i != e; i++) {
1602 if (Args[i]->isTypeDependent())
1606 if (getLangOpts().DebuggerSupport) {
1607 QualType paramTy; // ignored
1608 result = checkUnknownAnyArg(SelLoc, Args[i], paramTy);
1610 result = DefaultArgumentPromotion(Args[i]);
1612 if (result.isInvalid())
1614 Args[i] = result.get();
1618 if (getLangOpts().ObjCAutoRefCount)
1619 DiagID = diag::err_arc_method_not_found;
1621 DiagID = isClassMessage ? diag::warn_class_method_not_found
1622 : diag::warn_inst_method_not_found;
1623 if (!getLangOpts().DebuggerSupport) {
1624 const ObjCMethodDecl *OMD = SelectorsForTypoCorrection(Sel, ReceiverType);
1625 if (OMD && !OMD->isInvalidDecl()) {
1626 if (getLangOpts().ObjCAutoRefCount)
1627 DiagID = diag::err_method_not_found_with_typo;
1629 DiagID = isClassMessage ? diag::warn_class_method_not_found_with_typo
1630 : diag::warn_instance_method_not_found_with_typo;
1631 Selector MatchedSel = OMD->getSelector();
1632 SourceRange SelectorRange(SelectorLocs.front(), SelectorLocs.back());
1633 if (MatchedSel.isUnarySelector())
1634 Diag(SelLoc, DiagID)
1635 << Sel<< isClassMessage << MatchedSel
1636 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1638 Diag(SelLoc, DiagID) << Sel<< isClassMessage << MatchedSel;
1641 Diag(SelLoc, DiagID)
1642 << Sel << isClassMessage << SourceRange(SelectorLocs.front(),
1643 SelectorLocs.back());
1644 // Find the class to which we are sending this message.
1645 if (auto *ObjPT = ReceiverType->getAs<ObjCObjectPointerType>()) {
1646 if (ObjCInterfaceDecl *ThisClass = ObjPT->getInterfaceDecl()) {
1647 Diag(ThisClass->getLocation(), diag::note_receiver_class_declared);
1648 if (!RecRange.isInvalid())
1649 if (ThisClass->lookupClassMethod(Sel))
1650 Diag(RecRange.getBegin(), diag::note_receiver_expr_here)
1651 << FixItHint::CreateReplacement(RecRange,
1652 ThisClass->getNameAsString());
1657 // In debuggers, we want to use __unknown_anytype for these
1658 // results so that clients can cast them.
1659 if (getLangOpts().DebuggerSupport) {
1660 ReturnType = Context.UnknownAnyTy;
1662 ReturnType = Context.getObjCIdType();
1668 ReturnType = getMessageSendResultType(Receiver, ReceiverType, Method,
1669 isClassMessage, isSuperMessage);
1670 VK = Expr::getValueKindForType(Method->getReturnType());
1672 unsigned NumNamedArgs = Sel.getNumArgs();
1673 // Method might have more arguments than selector indicates. This is due
1674 // to addition of c-style arguments in method.
1675 if (Method->param_size() > Sel.getNumArgs())
1676 NumNamedArgs = Method->param_size();
1677 // FIXME. This need be cleaned up.
1678 if (Args.size() < NumNamedArgs) {
1679 Diag(SelLoc, diag::err_typecheck_call_too_few_args)
1680 << 2 << NumNamedArgs << static_cast<unsigned>(Args.size());
1684 // Compute the set of type arguments to be substituted into each parameter
1686 Optional<ArrayRef<QualType>> typeArgs
1687 = ReceiverType->getObjCSubstitutions(Method->getDeclContext());
1688 bool IsError = false;
1689 for (unsigned i = 0; i < NumNamedArgs; i++) {
1690 // We can't do any type-checking on a type-dependent argument.
1691 if (Args[i]->isTypeDependent())
1694 Expr *argExpr = Args[i];
1696 ParmVarDecl *param = Method->parameters()[i];
1697 assert(argExpr && "CheckMessageArgumentTypes(): missing expression");
1699 if (param->hasAttr<NoEscapeAttr>())
1700 if (auto *BE = dyn_cast<BlockExpr>(
1701 argExpr->IgnoreParenNoopCasts(Context)))
1702 BE->getBlockDecl()->setDoesNotEscape();
1704 // Strip the unbridged-cast placeholder expression off unless it's
1705 // a consumed argument.
1706 if (argExpr->hasPlaceholderType(BuiltinType::ARCUnbridgedCast) &&
1707 !param->hasAttr<CFConsumedAttr>())
1708 argExpr = stripARCUnbridgedCast(argExpr);
1710 // If the parameter is __unknown_anytype, infer its type
1711 // from the argument.
1712 if (param->getType() == Context.UnknownAnyTy) {
1714 ExprResult argE = checkUnknownAnyArg(SelLoc, argExpr, paramType);
1715 if (argE.isInvalid()) {
1718 Args[i] = argE.get();
1720 // Update the parameter type in-place.
1721 param->setType(paramType);
1726 QualType origParamType = param->getType();
1727 QualType paramType = param->getType();
1729 paramType = paramType.substObjCTypeArgs(
1732 ObjCSubstitutionContext::Parameter);
1734 if (RequireCompleteType(argExpr->getSourceRange().getBegin(),
1736 diag::err_call_incomplete_argument, argExpr))
1739 InitializedEntity Entity
1740 = InitializedEntity::InitializeParameter(Context, param, paramType);
1741 ExprResult ArgE = PerformCopyInitialization(Entity, SourceLocation(), argExpr);
1742 if (ArgE.isInvalid())
1745 Args[i] = ArgE.getAs<Expr>();
1747 // If we are type-erasing a block to a block-compatible
1748 // Objective-C pointer type, we may need to extend the lifetime
1749 // of the block object.
1750 if (typeArgs && Args[i]->isRValue() && paramType->isBlockPointerType() &&
1751 Args[i]->getType()->isBlockPointerType() &&
1752 origParamType->isObjCObjectPointerType()) {
1753 ExprResult arg = Args[i];
1754 maybeExtendBlockObject(arg);
1755 Args[i] = arg.get();
1760 // Promote additional arguments to variadic methods.
1761 if (Method->isVariadic()) {
1762 for (unsigned i = NumNamedArgs, e = Args.size(); i < e; ++i) {
1763 if (Args[i]->isTypeDependent())
1766 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod,
1768 IsError |= Arg.isInvalid();
1769 Args[i] = Arg.get();
1772 // Check for extra arguments to non-variadic methods.
1773 if (Args.size() != NumNamedArgs) {
1774 Diag(Args[NumNamedArgs]->getBeginLoc(),
1775 diag::err_typecheck_call_too_many_args)
1776 << 2 /*method*/ << NumNamedArgs << static_cast<unsigned>(Args.size())
1777 << Method->getSourceRange()
1778 << SourceRange(Args[NumNamedArgs]->getBeginLoc(),
1779 Args.back()->getEndLoc());
1783 DiagnoseSentinelCalls(Method, SelLoc, Args);
1785 // Do additional checkings on method.
1786 IsError |= CheckObjCMethodCall(
1787 Method, SelLoc, makeArrayRef(Args.data(), Args.size()));
1792 bool Sema::isSelfExpr(Expr *RExpr) {
1793 // 'self' is objc 'self' in an objc method only.
1794 ObjCMethodDecl *Method =
1795 dyn_cast_or_null<ObjCMethodDecl>(CurContext->getNonClosureAncestor());
1796 return isSelfExpr(RExpr, Method);
1799 bool Sema::isSelfExpr(Expr *receiver, const ObjCMethodDecl *method) {
1800 if (!method) return false;
1802 receiver = receiver->IgnoreParenLValueCasts();
1803 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(receiver))
1804 if (DRE->getDecl() == method->getSelfDecl())
1809 /// LookupMethodInType - Look up a method in an ObjCObjectType.
1810 ObjCMethodDecl *Sema::LookupMethodInObjectType(Selector sel, QualType type,
1812 const ObjCObjectType *objType = type->castAs<ObjCObjectType>();
1813 if (ObjCInterfaceDecl *iface = objType->getInterface()) {
1814 // Look it up in the main interface (and categories, etc.)
1815 if (ObjCMethodDecl *method = iface->lookupMethod(sel, isInstance))
1818 // Okay, look for "private" methods declared in any
1819 // @implementations we've seen.
1820 if (ObjCMethodDecl *method = iface->lookupPrivateMethod(sel, isInstance))
1824 // Check qualifiers.
1825 for (const auto *I : objType->quals())
1826 if (ObjCMethodDecl *method = I->lookupMethod(sel, isInstance))
1832 /// LookupMethodInQualifiedType - Lookups up a method in protocol qualifier
1833 /// list of a qualified objective pointer type.
1834 ObjCMethodDecl *Sema::LookupMethodInQualifiedType(Selector Sel,
1835 const ObjCObjectPointerType *OPT,
1838 ObjCMethodDecl *MD = nullptr;
1839 for (const auto *PROTO : OPT->quals()) {
1840 if ((MD = PROTO->lookupMethod(Sel, Instance))) {
1847 /// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an
1848 /// objective C interface. This is a property reference expression.
1850 HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT,
1851 Expr *BaseExpr, SourceLocation OpLoc,
1852 DeclarationName MemberName,
1853 SourceLocation MemberLoc,
1854 SourceLocation SuperLoc, QualType SuperType,
1856 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType();
1857 ObjCInterfaceDecl *IFace = IFaceT->getDecl();
1859 if (!MemberName.isIdentifier()) {
1860 Diag(MemberLoc, diag::err_invalid_property_name)
1861 << MemberName << QualType(OPT, 0);
1865 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1867 SourceRange BaseRange = Super? SourceRange(SuperLoc)
1868 : BaseExpr->getSourceRange();
1869 if (RequireCompleteType(MemberLoc, OPT->getPointeeType(),
1870 diag::err_property_not_found_forward_class,
1871 MemberName, BaseRange))
1874 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(
1875 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1876 // Check whether we can reference this property.
1877 if (DiagnoseUseOfDecl(PD, MemberLoc))
1880 return new (Context)
1881 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1882 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1884 return new (Context)
1885 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1886 OK_ObjCProperty, MemberLoc, BaseExpr);
1888 // Check protocols on qualified interfaces.
1889 for (const auto *I : OPT->quals())
1890 if (ObjCPropertyDecl *PD = I->FindPropertyDeclaration(
1891 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1892 // Check whether we can reference this property.
1893 if (DiagnoseUseOfDecl(PD, MemberLoc))
1897 return new (Context) ObjCPropertyRefExpr(
1898 PD, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty, MemberLoc,
1899 SuperLoc, SuperType);
1901 return new (Context)
1902 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1903 OK_ObjCProperty, MemberLoc, BaseExpr);
1905 // If that failed, look for an "implicit" property by seeing if the nullary
1906 // selector is implemented.
1908 // FIXME: The logic for looking up nullary and unary selectors should be
1909 // shared with the code in ActOnInstanceMessage.
1911 Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
1912 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
1914 // May be found in property's qualified list.
1916 Getter = LookupMethodInQualifiedType(Sel, OPT, true);
1918 // If this reference is in an @implementation, check for 'private' methods.
1920 Getter = IFace->lookupPrivateMethod(Sel);
1923 // Check if we can reference this property.
1924 if (DiagnoseUseOfDecl(Getter, MemberLoc))
1927 // If we found a getter then this may be a valid dot-reference, we
1928 // will look for the matching setter, in case it is needed.
1929 Selector SetterSel =
1930 SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
1931 PP.getSelectorTable(), Member);
1932 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel);
1934 // May be found in property's qualified list.
1936 Setter = LookupMethodInQualifiedType(SetterSel, OPT, true);
1939 // If this reference is in an @implementation, also check for 'private'
1941 Setter = IFace->lookupPrivateMethod(SetterSel);
1944 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
1947 // Special warning if member name used in a property-dot for a setter accessor
1948 // does not use a property with same name; e.g. obj.X = ... for a property with
1950 if (Setter && Setter->isImplicit() && Setter->isPropertyAccessor() &&
1951 !IFace->FindPropertyDeclaration(
1952 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1953 if (const ObjCPropertyDecl *PDecl = Setter->findPropertyDecl()) {
1954 // Do not warn if user is using property-dot syntax to make call to
1955 // user named setter.
1956 if (!(PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter))
1958 diag::warn_property_access_suggest)
1959 << MemberName << QualType(OPT, 0) << PDecl->getName()
1960 << FixItHint::CreateReplacement(MemberLoc, PDecl->getName());
1964 if (Getter || Setter) {
1966 return new (Context)
1967 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1968 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1970 return new (Context)
1971 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1972 OK_ObjCProperty, MemberLoc, BaseExpr);
1976 // Attempt to correct for typos in property names.
1977 DeclFilterCCC<ObjCPropertyDecl> CCC{};
1978 if (TypoCorrection Corrected = CorrectTypo(
1979 DeclarationNameInfo(MemberName, MemberLoc), LookupOrdinaryName,
1980 nullptr, nullptr, CCC, CTK_ErrorRecovery, IFace, false, OPT)) {
1981 DeclarationName TypoResult = Corrected.getCorrection();
1982 if (TypoResult.isIdentifier() &&
1983 TypoResult.getAsIdentifierInfo() == Member) {
1984 // There is no need to try the correction if it is the same.
1985 NamedDecl *ChosenDecl =
1986 Corrected.isKeyword() ? nullptr : Corrected.getFoundDecl();
1987 if (ChosenDecl && isa<ObjCPropertyDecl>(ChosenDecl))
1988 if (cast<ObjCPropertyDecl>(ChosenDecl)->isClassProperty()) {
1989 // This is a class property, we should not use the instance to
1991 Diag(MemberLoc, diag::err_class_property_found) << MemberName
1992 << OPT->getInterfaceDecl()->getName()
1993 << FixItHint::CreateReplacement(BaseExpr->getSourceRange(),
1994 OPT->getInterfaceDecl()->getName());
1998 diagnoseTypo(Corrected, PDiag(diag::err_property_not_found_suggest)
1999 << MemberName << QualType(OPT, 0));
2000 return HandleExprPropertyRefExpr(OPT, BaseExpr, OpLoc,
2001 TypoResult, MemberLoc,
2002 SuperLoc, SuperType, Super);
2005 ObjCInterfaceDecl *ClassDeclared;
2006 if (ObjCIvarDecl *Ivar =
2007 IFace->lookupInstanceVariable(Member, ClassDeclared)) {
2008 QualType T = Ivar->getType();
2009 if (const ObjCObjectPointerType * OBJPT =
2010 T->getAsObjCInterfacePointerType()) {
2011 if (RequireCompleteType(MemberLoc, OBJPT->getPointeeType(),
2012 diag::err_property_not_as_forward_class,
2013 MemberName, BaseExpr))
2017 diag::err_ivar_access_using_property_syntax_suggest)
2018 << MemberName << QualType(OPT, 0) << Ivar->getDeclName()
2019 << FixItHint::CreateReplacement(OpLoc, "->");
2023 Diag(MemberLoc, diag::err_property_not_found)
2024 << MemberName << QualType(OPT, 0);
2026 Diag(Setter->getLocation(), diag::note_getter_unavailable)
2027 << MemberName << BaseExpr->getSourceRange();
2032 ActOnClassPropertyRefExpr(IdentifierInfo &receiverName,
2033 IdentifierInfo &propertyName,
2034 SourceLocation receiverNameLoc,
2035 SourceLocation propertyNameLoc) {
2037 IdentifierInfo *receiverNamePtr = &receiverName;
2038 ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr,
2043 // If the "receiver" is 'super' in a method, handle it as an expression-like
2044 // property reference.
2045 if (receiverNamePtr->isStr("super")) {
2046 if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf(receiverNameLoc)) {
2047 if (auto classDecl = CurMethod->getClassInterface()) {
2048 SuperType = QualType(classDecl->getSuperClassType(), 0);
2049 if (CurMethod->isInstanceMethod()) {
2050 if (SuperType.isNull()) {
2051 // The current class does not have a superclass.
2052 Diag(receiverNameLoc, diag::err_root_class_cannot_use_super)
2053 << CurMethod->getClassInterface()->getIdentifier();
2056 QualType T = Context.getObjCObjectPointerType(SuperType);
2058 return HandleExprPropertyRefExpr(T->castAs<ObjCObjectPointerType>(),
2059 /*BaseExpr*/nullptr,
2060 SourceLocation()/*OpLoc*/,
2063 receiverNameLoc, T, true);
2066 // Otherwise, if this is a class method, try dispatching to our
2068 IFace = CurMethod->getClassInterface()->getSuperClass();
2074 Diag(receiverNameLoc, diag::err_expected_either) << tok::identifier
2082 if (auto PD = IFace->FindPropertyDeclaration(
2083 &propertyName, ObjCPropertyQueryKind::OBJC_PR_query_class)) {
2084 GetterSel = PD->getGetterName();
2085 SetterSel = PD->getSetterName();
2087 GetterSel = PP.getSelectorTable().getNullarySelector(&propertyName);
2088 SetterSel = SelectorTable::constructSetterSelector(
2089 PP.getIdentifierTable(), PP.getSelectorTable(), &propertyName);
2092 // Search for a declared property first.
2093 ObjCMethodDecl *Getter = IFace->lookupClassMethod(GetterSel);
2095 // If this reference is in an @implementation, check for 'private' methods.
2097 Getter = IFace->lookupPrivateClassMethod(GetterSel);
2100 // FIXME: refactor/share with ActOnMemberReference().
2101 // Check if we can reference this property.
2102 if (DiagnoseUseOfDecl(Getter, propertyNameLoc))
2106 // Look for the matching setter, in case it is needed.
2107 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
2109 // If this reference is in an @implementation, also check for 'private'
2111 Setter = IFace->lookupPrivateClassMethod(SetterSel);
2113 // Look through local category implementations associated with the class.
2115 Setter = IFace->getCategoryClassMethod(SetterSel);
2117 if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc))
2120 if (Getter || Setter) {
2121 if (!SuperType.isNull())
2122 return new (Context)
2123 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
2124 OK_ObjCProperty, propertyNameLoc, receiverNameLoc,
2127 return new (Context) ObjCPropertyRefExpr(
2128 Getter, Setter, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty,
2129 propertyNameLoc, receiverNameLoc, IFace);
2131 return ExprError(Diag(propertyNameLoc, diag::err_property_not_found)
2132 << &propertyName << Context.getObjCInterfaceType(IFace));
2137 class ObjCInterfaceOrSuperCCC final : public CorrectionCandidateCallback {
2139 ObjCInterfaceOrSuperCCC(ObjCMethodDecl *Method) {
2140 // Determine whether "super" is acceptable in the current context.
2141 if (Method && Method->getClassInterface())
2142 WantObjCSuper = Method->getClassInterface()->getSuperClass();
2145 bool ValidateCandidate(const TypoCorrection &candidate) override {
2146 return candidate.getCorrectionDeclAs<ObjCInterfaceDecl>() ||
2147 candidate.isKeyword("super");
2150 std::unique_ptr<CorrectionCandidateCallback> clone() override {
2151 return std::make_unique<ObjCInterfaceOrSuperCCC>(*this);
2155 } // end anonymous namespace
2157 Sema::ObjCMessageKind Sema::getObjCMessageKind(Scope *S,
2158 IdentifierInfo *Name,
2159 SourceLocation NameLoc,
2161 bool HasTrailingDot,
2162 ParsedType &ReceiverType) {
2163 ReceiverType = nullptr;
2165 // If the identifier is "super" and there is no trailing dot, we're
2166 // messaging super. If the identifier is "super" and there is a
2167 // trailing dot, it's an instance message.
2168 if (IsSuper && S->isInObjcMethodScope())
2169 return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage;
2171 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
2172 LookupName(Result, S);
2174 switch (Result.getResultKind()) {
2175 case LookupResult::NotFound:
2176 // Normal name lookup didn't find anything. If we're in an
2177 // Objective-C method, look for ivars. If we find one, we're done!
2178 // FIXME: This is a hack. Ivar lookup should be part of normal
2180 if (ObjCMethodDecl *Method = getCurMethodDecl()) {
2181 if (!Method->getClassInterface()) {
2182 // Fall back: let the parser try to parse it as an instance message.
2183 return ObjCInstanceMessage;
2186 ObjCInterfaceDecl *ClassDeclared;
2187 if (Method->getClassInterface()->lookupInstanceVariable(Name,
2189 return ObjCInstanceMessage;
2192 // Break out; we'll perform typo correction below.
2195 case LookupResult::NotFoundInCurrentInstantiation:
2196 case LookupResult::FoundOverloaded:
2197 case LookupResult::FoundUnresolvedValue:
2198 case LookupResult::Ambiguous:
2199 Result.suppressDiagnostics();
2200 return ObjCInstanceMessage;
2202 case LookupResult::Found: {
2203 // If the identifier is a class or not, and there is a trailing dot,
2204 // it's an instance message.
2206 return ObjCInstanceMessage;
2207 // We found something. If it's a type, then we have a class
2208 // message. Otherwise, it's an instance message.
2209 NamedDecl *ND = Result.getFoundDecl();
2211 if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND))
2212 T = Context.getObjCInterfaceType(Class);
2213 else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND)) {
2214 T = Context.getTypeDeclType(Type);
2215 DiagnoseUseOfDecl(Type, NameLoc);
2218 return ObjCInstanceMessage;
2220 // We have a class message, and T is the type we're
2221 // messaging. Build source-location information for it.
2222 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2223 ReceiverType = CreateParsedType(T, TSInfo);
2224 return ObjCClassMessage;
2228 ObjCInterfaceOrSuperCCC CCC(getCurMethodDecl());
2229 if (TypoCorrection Corrected = CorrectTypo(
2230 Result.getLookupNameInfo(), Result.getLookupKind(), S, nullptr, CCC,
2231 CTK_ErrorRecovery, nullptr, false, nullptr, false)) {
2232 if (Corrected.isKeyword()) {
2233 // If we've found the keyword "super" (the only keyword that would be
2234 // returned by CorrectTypo), this is a send to super.
2235 diagnoseTypo(Corrected,
2236 PDiag(diag::err_unknown_receiver_suggest) << Name);
2237 return ObjCSuperMessage;
2238 } else if (ObjCInterfaceDecl *Class =
2239 Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>()) {
2240 // If we found a declaration, correct when it refers to an Objective-C
2242 diagnoseTypo(Corrected,
2243 PDiag(diag::err_unknown_receiver_suggest) << Name);
2244 QualType T = Context.getObjCInterfaceType(Class);
2245 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2246 ReceiverType = CreateParsedType(T, TSInfo);
2247 return ObjCClassMessage;
2251 // Fall back: let the parser try to parse it as an instance message.
2252 return ObjCInstanceMessage;
2255 ExprResult Sema::ActOnSuperMessage(Scope *S,
2256 SourceLocation SuperLoc,
2258 SourceLocation LBracLoc,
2259 ArrayRef<SourceLocation> SelectorLocs,
2260 SourceLocation RBracLoc,
2261 MultiExprArg Args) {
2262 // Determine whether we are inside a method or not.
2263 ObjCMethodDecl *Method = tryCaptureObjCSelf(SuperLoc);
2265 Diag(SuperLoc, diag::err_invalid_receiver_to_message_super);
2269 ObjCInterfaceDecl *Class = Method->getClassInterface();
2271 Diag(SuperLoc, diag::err_no_super_class_message)
2272 << Method->getDeclName();
2276 QualType SuperTy(Class->getSuperClassType(), 0);
2277 if (SuperTy.isNull()) {
2278 // The current class does not have a superclass.
2279 Diag(SuperLoc, diag::err_root_class_cannot_use_super)
2280 << Class->getIdentifier();
2284 // We are in a method whose class has a superclass, so 'super'
2285 // is acting as a keyword.
2286 if (Method->getSelector() == Sel)
2287 getCurFunction()->ObjCShouldCallSuper = false;
2289 if (Method->isInstanceMethod()) {
2290 // Since we are in an instance method, this is an instance
2291 // message to the superclass instance.
2292 SuperTy = Context.getObjCObjectPointerType(SuperTy);
2293 return BuildInstanceMessage(nullptr, SuperTy, SuperLoc,
2294 Sel, /*Method=*/nullptr,
2295 LBracLoc, SelectorLocs, RBracLoc, Args);
2298 // Since we are in a class method, this is a class message to
2300 return BuildClassMessage(/*ReceiverTypeInfo=*/nullptr,
2302 SuperLoc, Sel, /*Method=*/nullptr,
2303 LBracLoc, SelectorLocs, RBracLoc, Args);
2306 ExprResult Sema::BuildClassMessageImplicit(QualType ReceiverType,
2307 bool isSuperReceiver,
2310 ObjCMethodDecl *Method,
2311 MultiExprArg Args) {
2312 TypeSourceInfo *receiverTypeInfo = nullptr;
2313 if (!ReceiverType.isNull())
2314 receiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType);
2316 return BuildClassMessage(receiverTypeInfo, ReceiverType,
2317 /*SuperLoc=*/isSuperReceiver ? Loc : SourceLocation(),
2318 Sel, Method, Loc, Loc, Loc, Args,
2319 /*isImplicit=*/true);
2322 static void applyCocoaAPICheck(Sema &S, const ObjCMessageExpr *Msg,
2324 bool (*refactor)(const ObjCMessageExpr *,
2325 const NSAPI &, edit::Commit &)) {
2326 SourceLocation MsgLoc = Msg->getExprLoc();
2327 if (S.Diags.isIgnored(DiagID, MsgLoc))
2330 SourceManager &SM = S.SourceMgr;
2331 edit::Commit ECommit(SM, S.LangOpts);
2332 if (refactor(Msg,*S.NSAPIObj, ECommit)) {
2333 DiagnosticBuilder Builder = S.Diag(MsgLoc, DiagID)
2334 << Msg->getSelector() << Msg->getSourceRange();
2335 // FIXME: Don't emit diagnostic at all if fixits are non-commitable.
2336 if (!ECommit.isCommitable())
2338 for (edit::Commit::edit_iterator
2339 I = ECommit.edit_begin(), E = ECommit.edit_end(); I != E; ++I) {
2340 const edit::Commit::Edit &Edit = *I;
2341 switch (Edit.Kind) {
2342 case edit::Commit::Act_Insert:
2343 Builder.AddFixItHint(FixItHint::CreateInsertion(Edit.OrigLoc,
2347 case edit::Commit::Act_InsertFromRange:
2348 Builder.AddFixItHint(
2349 FixItHint::CreateInsertionFromRange(Edit.OrigLoc,
2350 Edit.getInsertFromRange(SM),
2353 case edit::Commit::Act_Remove:
2354 Builder.AddFixItHint(FixItHint::CreateRemoval(Edit.getFileRange(SM)));
2361 static void checkCocoaAPI(Sema &S, const ObjCMessageExpr *Msg) {
2362 applyCocoaAPICheck(S, Msg, diag::warn_objc_redundant_literal_use,
2363 edit::rewriteObjCRedundantCallWithLiteral);
2366 static void checkFoundationAPI(Sema &S, SourceLocation Loc,
2367 const ObjCMethodDecl *Method,
2368 ArrayRef<Expr *> Args, QualType ReceiverType,
2369 bool IsClassObjectCall) {
2370 // Check if this is a performSelector method that uses a selector that returns
2371 // a record or a vector type.
2372 if (Method->getSelector().getMethodFamily() != OMF_performSelector ||
2375 const auto *SE = dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens());
2378 ObjCMethodDecl *ImpliedMethod;
2379 if (!IsClassObjectCall) {
2380 const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>();
2381 if (!OPT || !OPT->getInterfaceDecl())
2384 OPT->getInterfaceDecl()->lookupInstanceMethod(SE->getSelector());
2387 OPT->getInterfaceDecl()->lookupPrivateMethod(SE->getSelector());
2389 const auto *IT = ReceiverType->getAs<ObjCInterfaceType>();
2392 ImpliedMethod = IT->getDecl()->lookupClassMethod(SE->getSelector());
2395 IT->getDecl()->lookupPrivateClassMethod(SE->getSelector());
2399 QualType Ret = ImpliedMethod->getReturnType();
2400 if (Ret->isRecordType() || Ret->isVectorType() || Ret->isExtVectorType()) {
2401 S.Diag(Loc, diag::warn_objc_unsafe_perform_selector)
2402 << Method->getSelector()
2403 << (!Ret->isRecordType()
2405 : Ret->isUnionType() ? /*Union*/ 1 : /*Struct*/ 0);
2406 S.Diag(ImpliedMethod->getBeginLoc(),
2407 diag::note_objc_unsafe_perform_selector_method_declared_here)
2408 << ImpliedMethod->getSelector() << Ret;
2412 /// Diagnose use of %s directive in an NSString which is being passed
2413 /// as formatting string to formatting method.
2415 DiagnoseCStringFormatDirectiveInObjCAPI(Sema &S,
2416 ObjCMethodDecl *Method,
2418 Expr **Args, unsigned NumArgs) {
2420 bool Format = false;
2421 ObjCStringFormatFamily SFFamily = Sel.getStringFormatFamily();
2422 if (SFFamily == ObjCStringFormatFamily::SFF_NSString) {
2427 for (const auto *I : Method->specific_attrs<FormatAttr>()) {
2428 if (S.GetFormatNSStringIdx(I, Idx)) {
2434 if (!Format || NumArgs <= Idx)
2437 Expr *FormatExpr = Args[Idx];
2438 if (ObjCStringLiteral *OSL =
2439 dyn_cast<ObjCStringLiteral>(FormatExpr->IgnoreParenImpCasts())) {
2440 StringLiteral *FormatString = OSL->getString();
2441 if (S.FormatStringHasSArg(FormatString)) {
2442 S.Diag(FormatExpr->getExprLoc(), diag::warn_objc_cdirective_format_string)
2445 S.Diag(Method->getLocation(), diag::note_method_declared_at)
2446 << Method->getDeclName();
2451 /// Build an Objective-C class message expression.
2453 /// This routine takes care of both normal class messages and
2454 /// class messages to the superclass.
2456 /// \param ReceiverTypeInfo Type source information that describes the
2457 /// receiver of this message. This may be NULL, in which case we are
2458 /// sending to the superclass and \p SuperLoc must be a valid source
2461 /// \param ReceiverType The type of the object receiving the
2462 /// message. When \p ReceiverTypeInfo is non-NULL, this is the same
2463 /// type as that refers to. For a superclass send, this is the type of
2466 /// \param SuperLoc The location of the "super" keyword in a
2467 /// superclass message.
2469 /// \param Sel The selector to which the message is being sent.
2471 /// \param Method The method that this class message is invoking, if
2474 /// \param LBracLoc The location of the opening square bracket ']'.
2476 /// \param RBracLoc The location of the closing square bracket ']'.
2478 /// \param ArgsIn The message arguments.
2479 ExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo,
2480 QualType ReceiverType,
2481 SourceLocation SuperLoc,
2483 ObjCMethodDecl *Method,
2484 SourceLocation LBracLoc,
2485 ArrayRef<SourceLocation> SelectorLocs,
2486 SourceLocation RBracLoc,
2487 MultiExprArg ArgsIn,
2489 SourceLocation Loc = SuperLoc.isValid()? SuperLoc
2490 : ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin();
2491 if (LBracLoc.isInvalid()) {
2492 Diag(Loc, diag::err_missing_open_square_message_send)
2493 << FixItHint::CreateInsertion(Loc, "[");
2496 ArrayRef<SourceLocation> SelectorSlotLocs;
2497 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2498 SelectorSlotLocs = SelectorLocs;
2500 SelectorSlotLocs = Loc;
2501 SourceLocation SelLoc = SelectorSlotLocs.front();
2503 if (ReceiverType->isDependentType()) {
2504 // If the receiver type is dependent, we can't type-check anything
2505 // at this point. Build a dependent expression.
2506 unsigned NumArgs = ArgsIn.size();
2507 Expr **Args = ArgsIn.data();
2508 assert(SuperLoc.isInvalid() && "Message to super with dependent type");
2509 return ObjCMessageExpr::Create(
2510 Context, ReceiverType, VK_RValue, LBracLoc, ReceiverTypeInfo, Sel,
2511 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs), RBracLoc,
2515 // Find the class to which we are sending this message.
2516 ObjCInterfaceDecl *Class = nullptr;
2517 const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>();
2518 if (!ClassType || !(Class = ClassType->getInterface())) {
2519 Diag(Loc, diag::err_invalid_receiver_class_message)
2523 assert(Class && "We don't know which class we're messaging?");
2524 // objc++ diagnoses during typename annotation.
2525 if (!getLangOpts().CPlusPlus)
2526 (void)DiagnoseUseOfDecl(Class, SelectorSlotLocs);
2527 // Find the method we are messaging.
2529 SourceRange TypeRange
2530 = SuperLoc.isValid()? SourceRange(SuperLoc)
2531 : ReceiverTypeInfo->getTypeLoc().getSourceRange();
2532 if (RequireCompleteType(Loc, Context.getObjCInterfaceType(Class),
2533 (getLangOpts().ObjCAutoRefCount
2534 ? diag::err_arc_receiver_forward_class
2535 : diag::warn_receiver_forward_class),
2537 // A forward class used in messaging is treated as a 'Class'
2538 Method = LookupFactoryMethodInGlobalPool(Sel,
2539 SourceRange(LBracLoc, RBracLoc));
2540 if (Method && !getLangOpts().ObjCAutoRefCount)
2541 Diag(Method->getLocation(), diag::note_method_sent_forward_class)
2542 << Method->getDeclName();
2545 Method = Class->lookupClassMethod(Sel);
2547 // If we have an implementation in scope, check "private" methods.
2549 Method = Class->lookupPrivateClassMethod(Sel);
2551 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs,
2552 nullptr, false, false, Class))
2556 // Check the argument types and determine the result type.
2557 QualType ReturnType;
2558 ExprValueKind VK = VK_RValue;
2560 unsigned NumArgs = ArgsIn.size();
2561 Expr **Args = ArgsIn.data();
2562 if (CheckMessageArgumentTypes(/*Receiver=*/nullptr, ReceiverType,
2563 MultiExprArg(Args, NumArgs), Sel, SelectorLocs,
2564 Method, true, SuperLoc.isValid(), LBracLoc,
2565 RBracLoc, SourceRange(), ReturnType, VK))
2568 if (Method && !Method->getReturnType()->isVoidType() &&
2569 RequireCompleteType(LBracLoc, Method->getReturnType(),
2570 diag::err_illegal_message_expr_incomplete_type))
2573 // Warn about explicit call of +initialize on its own class. But not on 'super'.
2574 if (Method && Method->getMethodFamily() == OMF_initialize) {
2575 if (!SuperLoc.isValid()) {
2576 const ObjCInterfaceDecl *ID =
2577 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext());
2579 Diag(Loc, diag::warn_direct_initialize_call);
2580 Diag(Method->getLocation(), diag::note_method_declared_at)
2581 << Method->getDeclName();
2584 else if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2585 // [super initialize] is allowed only within an +initialize implementation
2586 if (CurMeth->getMethodFamily() != OMF_initialize) {
2587 Diag(Loc, diag::warn_direct_super_initialize_call);
2588 Diag(Method->getLocation(), diag::note_method_declared_at)
2589 << Method->getDeclName();
2590 Diag(CurMeth->getLocation(), diag::note_method_declared_at)
2591 << CurMeth->getDeclName();
2596 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
2598 // Construct the appropriate ObjCMessageExpr.
2599 ObjCMessageExpr *Result;
2600 if (SuperLoc.isValid())
2601 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2602 SuperLoc, /*IsInstanceSuper=*/false,
2603 ReceiverType, Sel, SelectorLocs,
2604 Method, makeArrayRef(Args, NumArgs),
2605 RBracLoc, isImplicit);
2607 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2608 ReceiverTypeInfo, Sel, SelectorLocs,
2609 Method, makeArrayRef(Args, NumArgs),
2610 RBracLoc, isImplicit);
2612 checkCocoaAPI(*this, Result);
2615 checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs),
2616 ReceiverType, /*IsClassObjectCall=*/true);
2617 return MaybeBindToTemporary(Result);
2620 // ActOnClassMessage - used for both unary and keyword messages.
2621 // ArgExprs is optional - if it is present, the number of expressions
2622 // is obtained from Sel.getNumArgs().
2623 ExprResult Sema::ActOnClassMessage(Scope *S,
2624 ParsedType Receiver,
2626 SourceLocation LBracLoc,
2627 ArrayRef<SourceLocation> SelectorLocs,
2628 SourceLocation RBracLoc,
2629 MultiExprArg Args) {
2630 TypeSourceInfo *ReceiverTypeInfo;
2631 QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo);
2632 if (ReceiverType.isNull())
2635 if (!ReceiverTypeInfo)
2636 ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc);
2638 return BuildClassMessage(ReceiverTypeInfo, ReceiverType,
2639 /*SuperLoc=*/SourceLocation(), Sel,
2640 /*Method=*/nullptr, LBracLoc, SelectorLocs, RBracLoc,
2644 ExprResult Sema::BuildInstanceMessageImplicit(Expr *Receiver,
2645 QualType ReceiverType,
2648 ObjCMethodDecl *Method,
2649 MultiExprArg Args) {
2650 return BuildInstanceMessage(Receiver, ReceiverType,
2651 /*SuperLoc=*/!Receiver ? Loc : SourceLocation(),
2652 Sel, Method, Loc, Loc, Loc, Args,
2653 /*isImplicit=*/true);
2656 static bool isMethodDeclaredInRootProtocol(Sema &S, const ObjCMethodDecl *M) {
2659 const auto *Protocol = dyn_cast<ObjCProtocolDecl>(M->getDeclContext());
2662 const IdentifierInfo *II = S.NSAPIObj->getNSClassId(NSAPI::ClassId_NSObject);
2663 if (const auto *RootClass = dyn_cast_or_null<ObjCInterfaceDecl>(
2664 S.LookupSingleName(S.TUScope, II, Protocol->getBeginLoc(),
2665 Sema::LookupOrdinaryName))) {
2666 for (const ObjCProtocolDecl *P : RootClass->all_referenced_protocols()) {
2667 if (P->getCanonicalDecl() == Protocol->getCanonicalDecl())
2674 /// Build an Objective-C instance message expression.
2676 /// This routine takes care of both normal instance messages and
2677 /// instance messages to the superclass instance.
2679 /// \param Receiver The expression that computes the object that will
2680 /// receive this message. This may be empty, in which case we are
2681 /// sending to the superclass instance and \p SuperLoc must be a valid
2682 /// source location.
2684 /// \param ReceiverType The (static) type of the object receiving the
2685 /// message. When a \p Receiver expression is provided, this is the
2686 /// same type as that expression. For a superclass instance send, this
2687 /// is a pointer to the type of the superclass.
2689 /// \param SuperLoc The location of the "super" keyword in a
2690 /// superclass instance message.
2692 /// \param Sel The selector to which the message is being sent.
2694 /// \param Method The method that this instance message is invoking, if
2697 /// \param LBracLoc The location of the opening square bracket ']'.
2699 /// \param RBracLoc The location of the closing square bracket ']'.
2701 /// \param ArgsIn The message arguments.
2702 ExprResult Sema::BuildInstanceMessage(Expr *Receiver,
2703 QualType ReceiverType,
2704 SourceLocation SuperLoc,
2706 ObjCMethodDecl *Method,
2707 SourceLocation LBracLoc,
2708 ArrayRef<SourceLocation> SelectorLocs,
2709 SourceLocation RBracLoc,
2710 MultiExprArg ArgsIn,
2712 assert((Receiver || SuperLoc.isValid()) && "If the Receiver is null, the "
2713 "SuperLoc must be valid so we can "
2716 // The location of the receiver.
2717 SourceLocation Loc = SuperLoc.isValid() ? SuperLoc : Receiver->getBeginLoc();
2718 SourceRange RecRange =
2719 SuperLoc.isValid()? SuperLoc : Receiver->getSourceRange();
2720 ArrayRef<SourceLocation> SelectorSlotLocs;
2721 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2722 SelectorSlotLocs = SelectorLocs;
2724 SelectorSlotLocs = Loc;
2725 SourceLocation SelLoc = SelectorSlotLocs.front();
2727 if (LBracLoc.isInvalid()) {
2728 Diag(Loc, diag::err_missing_open_square_message_send)
2729 << FixItHint::CreateInsertion(Loc, "[");
2733 // If we have a receiver expression, perform appropriate promotions
2734 // and determine receiver type.
2736 if (Receiver->hasPlaceholderType()) {
2738 if (Receiver->getType() == Context.UnknownAnyTy)
2739 Result = forceUnknownAnyToType(Receiver, Context.getObjCIdType());
2741 Result = CheckPlaceholderExpr(Receiver);
2742 if (Result.isInvalid()) return ExprError();
2743 Receiver = Result.get();
2746 if (Receiver->isTypeDependent()) {
2747 // If the receiver is type-dependent, we can't type-check anything
2748 // at this point. Build a dependent expression.
2749 unsigned NumArgs = ArgsIn.size();
2750 Expr **Args = ArgsIn.data();
2751 assert(SuperLoc.isInvalid() && "Message to super with dependent type");
2752 return ObjCMessageExpr::Create(
2753 Context, Context.DependentTy, VK_RValue, LBracLoc, Receiver, Sel,
2754 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs),
2755 RBracLoc, isImplicit);
2758 // If necessary, apply function/array conversion to the receiver.
2759 // C99 6.7.5.3p[7,8].
2760 ExprResult Result = DefaultFunctionArrayLvalueConversion(Receiver);
2761 if (Result.isInvalid())
2763 Receiver = Result.get();
2764 ReceiverType = Receiver->getType();
2766 // If the receiver is an ObjC pointer, a block pointer, or an
2767 // __attribute__((NSObject)) pointer, we don't need to do any
2768 // special conversion in order to look up a receiver.
2769 if (ReceiverType->isObjCRetainableType()) {
2771 } else if (!getLangOpts().ObjCAutoRefCount &&
2772 !Context.getObjCIdType().isNull() &&
2773 (ReceiverType->isPointerType() ||
2774 ReceiverType->isIntegerType())) {
2775 // Implicitly convert integers and pointers to 'id' but emit a warning.
2777 Diag(Loc, diag::warn_bad_receiver_type)
2779 << Receiver->getSourceRange();
2780 if (ReceiverType->isPointerType()) {
2781 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2782 CK_CPointerToObjCPointerCast).get();
2784 // TODO: specialized warning on null receivers?
2785 bool IsNull = Receiver->isNullPointerConstant(Context,
2786 Expr::NPC_ValueDependentIsNull);
2787 CastKind Kind = IsNull ? CK_NullToPointer : CK_IntegralToPointer;
2788 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2791 ReceiverType = Receiver->getType();
2792 } else if (getLangOpts().CPlusPlus) {
2793 // The receiver must be a complete type.
2794 if (RequireCompleteType(Loc, Receiver->getType(),
2795 diag::err_incomplete_receiver_type))
2798 ExprResult result = PerformContextuallyConvertToObjCPointer(Receiver);
2799 if (result.isUsable()) {
2800 Receiver = result.get();
2801 ReceiverType = Receiver->getType();
2806 // There's a somewhat weird interaction here where we assume that we
2807 // won't actually have a method unless we also don't need to do some
2808 // of the more detailed type-checking on the receiver.
2811 // Handle messages to id and __kindof types (where we use the
2812 // global method pool).
2813 const ObjCObjectType *typeBound = nullptr;
2814 bool receiverIsIdLike = ReceiverType->isObjCIdOrObjectKindOfType(Context,
2816 if (receiverIsIdLike || ReceiverType->isBlockPointerType() ||
2817 (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) {
2818 SmallVector<ObjCMethodDecl*, 4> Methods;
2819 // If we have a type bound, further filter the methods.
2820 CollectMultipleMethodsInGlobalPool(Sel, Methods, true/*InstanceFirst*/,
2821 true/*CheckTheOther*/, typeBound);
2822 if (!Methods.empty()) {
2823 // We choose the first method as the initial candidate, then try to
2824 // select a better one.
2825 Method = Methods[0];
2827 if (ObjCMethodDecl *BestMethod =
2828 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(), Methods))
2829 Method = BestMethod;
2831 if (!AreMultipleMethodsInGlobalPool(Sel, Method,
2832 SourceRange(LBracLoc, RBracLoc),
2833 receiverIsIdLike, Methods))
2834 DiagnoseUseOfDecl(Method, SelectorSlotLocs);
2836 } else if (ReceiverType->isObjCClassOrClassKindOfType() ||
2837 ReceiverType->isObjCQualifiedClassType()) {
2838 // Handle messages to Class.
2839 // We allow sending a message to a qualified Class ("Class<foo>"), which
2840 // is ok as long as one of the protocols implements the selector (if not,
2842 if (!ReceiverType->isObjCClassOrClassKindOfType()) {
2843 const ObjCObjectPointerType *QClassTy
2844 = ReceiverType->getAsObjCQualifiedClassType();
2845 // Search protocols for class methods.
2846 Method = LookupMethodInQualifiedType(Sel, QClassTy, false);
2848 Method = LookupMethodInQualifiedType(Sel, QClassTy, true);
2849 // warn if instance method found for a Class message.
2850 if (Method && !isMethodDeclaredInRootProtocol(*this, Method)) {
2851 Diag(SelLoc, diag::warn_instance_method_on_class_found)
2852 << Method->getSelector() << Sel;
2853 Diag(Method->getLocation(), diag::note_method_declared_at)
2854 << Method->getDeclName();
2858 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2859 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) {
2860 // As a guess, try looking for the method in the current interface.
2861 // This very well may not produce the "right" method.
2863 // First check the public methods in the class interface.
2864 Method = ClassDecl->lookupClassMethod(Sel);
2867 Method = ClassDecl->lookupPrivateClassMethod(Sel);
2869 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs))
2874 // If not messaging 'self', look for any factory method named 'Sel'.
2875 if (!Receiver || !isSelfExpr(Receiver)) {
2876 // If no class (factory) method was found, check if an _instance_
2877 // method of the same name exists in the root class only.
2878 SmallVector<ObjCMethodDecl*, 4> Methods;
2879 CollectMultipleMethodsInGlobalPool(Sel, Methods,
2880 false/*InstanceFirst*/,
2881 true/*CheckTheOther*/);
2882 if (!Methods.empty()) {
2883 // We choose the first method as the initial candidate, then try
2884 // to select a better one.
2885 Method = Methods[0];
2887 // If we find an instance method, emit warning.
2888 if (Method->isInstanceMethod()) {
2889 if (const ObjCInterfaceDecl *ID =
2890 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) {
2891 if (ID->getSuperClass())
2892 Diag(SelLoc, diag::warn_root_inst_method_not_found)
2893 << Sel << SourceRange(LBracLoc, RBracLoc);
2897 if (ObjCMethodDecl *BestMethod =
2898 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2900 Method = BestMethod;
2906 ObjCInterfaceDecl *ClassDecl = nullptr;
2908 // We allow sending a message to a qualified ID ("id<foo>"), which is ok as
2909 // long as one of the protocols implements the selector (if not, warn).
2910 // And as long as message is not deprecated/unavailable (warn if it is).
2911 if (const ObjCObjectPointerType *QIdTy
2912 = ReceiverType->getAsObjCQualifiedIdType()) {
2913 // Search protocols for instance methods.
2914 Method = LookupMethodInQualifiedType(Sel, QIdTy, true);
2916 Method = LookupMethodInQualifiedType(Sel, QIdTy, false);
2917 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs))
2919 } else if (const ObjCObjectPointerType *OCIType
2920 = ReceiverType->getAsObjCInterfacePointerType()) {
2921 // We allow sending a message to a pointer to an interface (an object).
2922 ClassDecl = OCIType->getInterfaceDecl();
2924 // Try to complete the type. Under ARC, this is a hard error from which
2925 // we don't try to recover.
2926 // FIXME: In the non-ARC case, this will still be a hard error if the
2927 // definition is found in a module that's not visible.
2928 const ObjCInterfaceDecl *forwardClass = nullptr;
2929 if (RequireCompleteType(Loc, OCIType->getPointeeType(),
2930 getLangOpts().ObjCAutoRefCount
2931 ? diag::err_arc_receiver_forward_instance
2932 : diag::warn_receiver_forward_instance,
2933 Receiver? Receiver->getSourceRange()
2934 : SourceRange(SuperLoc))) {
2935 if (getLangOpts().ObjCAutoRefCount)
2938 forwardClass = OCIType->getInterfaceDecl();
2939 Diag(Receiver ? Receiver->getBeginLoc() : SuperLoc,
2940 diag::note_receiver_is_id);
2943 Method = ClassDecl->lookupInstanceMethod(Sel);
2947 // Search protocol qualifiers.
2948 Method = LookupMethodInQualifiedType(Sel, OCIType, true);
2951 // If we have implementations in scope, check "private" methods.
2952 Method = ClassDecl->lookupPrivateMethod(Sel);
2954 if (!Method && getLangOpts().ObjCAutoRefCount) {
2955 Diag(SelLoc, diag::err_arc_may_not_respond)
2956 << OCIType->getPointeeType() << Sel << RecRange
2957 << SourceRange(SelectorLocs.front(), SelectorLocs.back());
2961 if (!Method && (!Receiver || !isSelfExpr(Receiver))) {
2962 // If we still haven't found a method, look in the global pool. This
2963 // behavior isn't very desirable, however we need it for GCC
2964 // compatibility. FIXME: should we deviate??
2965 if (OCIType->qual_empty()) {
2966 SmallVector<ObjCMethodDecl*, 4> Methods;
2967 CollectMultipleMethodsInGlobalPool(Sel, Methods,
2968 true/*InstanceFirst*/,
2969 false/*CheckTheOther*/);
2970 if (!Methods.empty()) {
2971 // We choose the first method as the initial candidate, then try
2972 // to select a better one.
2973 Method = Methods[0];
2975 if (ObjCMethodDecl *BestMethod =
2976 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2978 Method = BestMethod;
2980 AreMultipleMethodsInGlobalPool(Sel, Method,
2981 SourceRange(LBracLoc, RBracLoc),
2982 true/*receiverIdOrClass*/,
2985 if (Method && !forwardClass)
2986 Diag(SelLoc, diag::warn_maynot_respond)
2987 << OCIType->getInterfaceDecl()->getIdentifier()
2992 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs, forwardClass))
2995 // Reject other random receiver types (e.g. structs).
2996 Diag(Loc, diag::err_bad_receiver_type)
2997 << ReceiverType << Receiver->getSourceRange();
3003 FunctionScopeInfo *DIFunctionScopeInfo =
3004 (Method && Method->getMethodFamily() == OMF_init)
3005 ? getEnclosingFunction() : nullptr;
3007 if (Method && Method->isDirectMethod()) {
3008 if (ReceiverType->isObjCIdType() && !isImplicit) {
3009 Diag(Receiver->getExprLoc(),
3010 diag::err_messaging_unqualified_id_with_direct_method);
3011 Diag(Method->getLocation(), diag::note_direct_method_declared_at)
3012 << Method->getDeclName();
3015 if (ReceiverType->isObjCClassType() && !isImplicit) {
3016 Diag(Receiver->getExprLoc(),
3017 diag::err_messaging_class_with_direct_method);
3018 Diag(Method->getLocation(), diag::note_direct_method_declared_at)
3019 << Method->getDeclName();
3022 if (SuperLoc.isValid()) {
3023 Diag(SuperLoc, diag::err_messaging_super_with_direct_method);
3024 Diag(Method->getLocation(), diag::note_direct_method_declared_at)
3025 << Method->getDeclName();
3027 } else if (ReceiverType->isObjCIdType() && !isImplicit) {
3028 Diag(Receiver->getExprLoc(), diag::warn_messaging_unqualified_id);
3031 if (DIFunctionScopeInfo &&
3032 DIFunctionScopeInfo->ObjCIsDesignatedInit &&
3033 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
3034 bool isDesignatedInitChain = false;
3035 if (SuperLoc.isValid()) {
3036 if (const ObjCObjectPointerType *
3037 OCIType = ReceiverType->getAsObjCInterfacePointerType()) {
3038 if (const ObjCInterfaceDecl *ID = OCIType->getInterfaceDecl()) {
3039 // Either we know this is a designated initializer or we
3040 // conservatively assume it because we don't know for sure.
3041 if (!ID->declaresOrInheritsDesignatedInitializers() ||
3042 ID->isDesignatedInitializer(Sel)) {
3043 isDesignatedInitChain = true;
3044 DIFunctionScopeInfo->ObjCWarnForNoDesignatedInitChain = false;
3049 if (!isDesignatedInitChain) {
3050 const ObjCMethodDecl *InitMethod = nullptr;
3052 getCurMethodDecl()->isDesignatedInitializerForTheInterface(&InitMethod);
3053 assert(isDesignated && InitMethod);
3055 Diag(SelLoc, SuperLoc.isValid() ?
3056 diag::warn_objc_designated_init_non_designated_init_call :
3057 diag::warn_objc_designated_init_non_super_designated_init_call);
3058 Diag(InitMethod->getLocation(),
3059 diag::note_objc_designated_init_marked_here);
3063 if (DIFunctionScopeInfo &&
3064 DIFunctionScopeInfo->ObjCIsSecondaryInit &&
3065 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
3066 if (SuperLoc.isValid()) {
3067 Diag(SelLoc, diag::warn_objc_secondary_init_super_init_call);
3069 DIFunctionScopeInfo->ObjCWarnForNoInitDelegation = false;
3073 // Check the message arguments.
3074 unsigned NumArgs = ArgsIn.size();
3075 Expr **Args = ArgsIn.data();
3076 QualType ReturnType;
3077 ExprValueKind VK = VK_RValue;
3078 bool ClassMessage = (ReceiverType->isObjCClassType() ||
3079 ReceiverType->isObjCQualifiedClassType());
3080 if (CheckMessageArgumentTypes(Receiver, ReceiverType,
3081 MultiExprArg(Args, NumArgs), Sel, SelectorLocs,
3082 Method, ClassMessage, SuperLoc.isValid(),
3083 LBracLoc, RBracLoc, RecRange, ReturnType, VK))
3086 if (Method && !Method->getReturnType()->isVoidType() &&
3087 RequireCompleteType(LBracLoc, Method->getReturnType(),
3088 diag::err_illegal_message_expr_incomplete_type))
3091 // In ARC, forbid the user from sending messages to
3092 // retain/release/autorelease/dealloc/retainCount explicitly.
3093 if (getLangOpts().ObjCAutoRefCount) {
3094 ObjCMethodFamily family =
3095 (Method ? Method->getMethodFamily() : Sel.getMethodFamily());
3099 checkInitMethod(Method, ReceiverType);
3106 case OMF_mutableCopy:
3109 case OMF_initialize:
3115 case OMF_autorelease:
3116 case OMF_retainCount:
3117 Diag(SelLoc, diag::err_arc_illegal_explicit_message)
3121 case OMF_performSelector:
3122 if (Method && NumArgs >= 1) {
3123 if (const auto *SelExp =
3124 dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens())) {
3125 Selector ArgSel = SelExp->getSelector();
3126 ObjCMethodDecl *SelMethod =
3127 LookupInstanceMethodInGlobalPool(ArgSel,
3128 SelExp->getSourceRange());
3131 LookupFactoryMethodInGlobalPool(ArgSel,
3132 SelExp->getSourceRange());
3134 ObjCMethodFamily SelFamily = SelMethod->getMethodFamily();
3135 switch (SelFamily) {
3138 case OMF_mutableCopy:
3141 // Issue error, unless ns_returns_not_retained.
3142 if (!SelMethod->hasAttr<NSReturnsNotRetainedAttr>()) {
3143 // selector names a +1 method
3145 diag::err_arc_perform_selector_retains);
3146 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
3147 << SelMethod->getDeclName();
3151 // +0 call. OK. unless ns_returns_retained.
3152 if (SelMethod->hasAttr<NSReturnsRetainedAttr>()) {
3153 // selector names a +1 method
3155 diag::err_arc_perform_selector_retains);
3156 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
3157 << SelMethod->getDeclName();
3163 // error (may leak).
3164 Diag(SelLoc, diag::warn_arc_perform_selector_leaks);
3165 Diag(Args[0]->getExprLoc(), diag::note_used_here);
3172 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
3174 // Construct the appropriate ObjCMessageExpr instance.
3175 ObjCMessageExpr *Result;
3176 if (SuperLoc.isValid())
3177 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
3178 SuperLoc, /*IsInstanceSuper=*/true,
3179 ReceiverType, Sel, SelectorLocs, Method,
3180 makeArrayRef(Args, NumArgs), RBracLoc,
3183 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
3184 Receiver, Sel, SelectorLocs, Method,
3185 makeArrayRef(Args, NumArgs), RBracLoc,
3188 checkCocoaAPI(*this, Result);
3191 bool IsClassObjectCall = ClassMessage;
3192 // 'self' message receivers in class methods should be treated as message
3193 // sends to the class object in order for the semantic checks to be
3194 // performed correctly. Messages to 'super' already count as class messages,
3195 // so they don't need to be handled here.
3196 if (Receiver && isSelfExpr(Receiver)) {
3197 if (const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>()) {
3198 if (OPT->getObjectType()->isObjCClass()) {
3199 if (const auto *CurMeth = getCurMethodDecl()) {
3200 IsClassObjectCall = true;
3202 Context.getObjCInterfaceType(CurMeth->getClassInterface());
3207 checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs),
3208 ReceiverType, IsClassObjectCall);
3211 if (getLangOpts().ObjCAutoRefCount) {
3212 // In ARC, annotate delegate init calls.
3213 if (Result->getMethodFamily() == OMF_init &&
3214 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
3215 // Only consider init calls *directly* in init implementations,
3216 // not within blocks.
3217 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(CurContext);
3218 if (method && method->getMethodFamily() == OMF_init) {
3219 // The implicit assignment to self means we also don't want to
3220 // consume the result.
3221 Result->setDelegateInitCall(true);
3226 // In ARC, check for message sends which are likely to introduce
3228 checkRetainCycles(Result);
3231 if (getLangOpts().ObjCWeak) {
3232 if (!isImplicit && Method) {
3233 if (const ObjCPropertyDecl *Prop = Method->findPropertyDecl()) {
3235 Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak;
3236 if (!IsWeak && Sel.isUnarySelector())
3237 IsWeak = ReturnType.getObjCLifetime() & Qualifiers::OCL_Weak;
3238 if (IsWeak && !isUnevaluatedContext() &&
3239 !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, LBracLoc))
3240 getCurFunction()->recordUseOfWeak(Result, Prop);
3245 CheckObjCCircularContainer(Result);
3247 return MaybeBindToTemporary(Result);
3250 static void RemoveSelectorFromWarningCache(Sema &S, Expr* Arg) {
3251 if (ObjCSelectorExpr *OSE =
3252 dyn_cast<ObjCSelectorExpr>(Arg->IgnoreParenCasts())) {
3253 Selector Sel = OSE->getSelector();
3254 SourceLocation Loc = OSE->getAtLoc();
3255 auto Pos = S.ReferencedSelectors.find(Sel);
3256 if (Pos != S.ReferencedSelectors.end() && Pos->second == Loc)
3257 S.ReferencedSelectors.erase(Pos);
3261 // ActOnInstanceMessage - used for both unary and keyword messages.
3262 // ArgExprs is optional - if it is present, the number of expressions
3263 // is obtained from Sel.getNumArgs().
3264 ExprResult Sema::ActOnInstanceMessage(Scope *S,
3267 SourceLocation LBracLoc,
3268 ArrayRef<SourceLocation> SelectorLocs,
3269 SourceLocation RBracLoc,
3270 MultiExprArg Args) {
3274 // A ParenListExpr can show up while doing error recovery with invalid code.
3275 if (isa<ParenListExpr>(Receiver)) {
3276 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Receiver);
3277 if (Result.isInvalid()) return ExprError();
3278 Receiver = Result.get();
3281 if (RespondsToSelectorSel.isNull()) {
3282 IdentifierInfo *SelectorId = &Context.Idents.get("respondsToSelector");
3283 RespondsToSelectorSel = Context.Selectors.getUnarySelector(SelectorId);
3285 if (Sel == RespondsToSelectorSel)
3286 RemoveSelectorFromWarningCache(*this, Args[0]);
3288 return BuildInstanceMessage(Receiver, Receiver->getType(),
3289 /*SuperLoc=*/SourceLocation(), Sel,
3290 /*Method=*/nullptr, LBracLoc, SelectorLocs,
3294 enum ARCConversionTypeClass {
3295 /// int, void, struct A
3301 /// id*, id***, void (^*)(),
3302 ACTC_indirectRetainable,
3304 /// void* might be a normal C type, or it might a CF type.
3311 static bool isAnyRetainable(ARCConversionTypeClass ACTC) {
3312 return (ACTC == ACTC_retainable ||
3313 ACTC == ACTC_coreFoundation ||
3314 ACTC == ACTC_voidPtr);
3317 static bool isAnyCLike(ARCConversionTypeClass ACTC) {
3318 return ACTC == ACTC_none ||
3319 ACTC == ACTC_voidPtr ||
3320 ACTC == ACTC_coreFoundation;
3323 static ARCConversionTypeClass classifyTypeForARCConversion(QualType type) {
3324 bool isIndirect = false;
3326 // Ignore an outermost reference type.
3327 if (const ReferenceType *ref = type->getAs<ReferenceType>()) {
3328 type = ref->getPointeeType();
3332 // Drill through pointers and arrays recursively.
3334 if (const PointerType *ptr = type->getAs<PointerType>()) {
3335 type = ptr->getPointeeType();
3337 // The first level of pointer may be the innermost pointer on a CF type.
3339 if (type->isVoidType()) return ACTC_voidPtr;
3340 if (type->isRecordType()) return ACTC_coreFoundation;
3342 } else if (const ArrayType *array = type->getAsArrayTypeUnsafe()) {
3343 type = QualType(array->getElementType()->getBaseElementTypeUnsafe(), 0);
3351 if (type->isObjCARCBridgableType())
3352 return ACTC_indirectRetainable;
3356 if (type->isObjCARCBridgableType())
3357 return ACTC_retainable;
3363 /// A result from the cast checker.
3365 /// Cannot be casted.
3368 /// Can be safely retained or not retained.
3371 /// Can be casted at +0.
3374 /// Can be casted at +1.
3377 ACCResult merge(ACCResult left, ACCResult right) {
3378 if (left == right) return left;
3379 if (left == ACC_bottom) return right;
3380 if (right == ACC_bottom) return left;
3384 /// A checker which white-lists certain expressions whose conversion
3385 /// to or from retainable type would otherwise be forbidden in ARC.
3386 class ARCCastChecker : public StmtVisitor<ARCCastChecker, ACCResult> {
3387 typedef StmtVisitor<ARCCastChecker, ACCResult> super;
3389 ASTContext &Context;
3390 ARCConversionTypeClass SourceClass;
3391 ARCConversionTypeClass TargetClass;
3394 static bool isCFType(QualType type) {
3395 // Someday this can use ns_bridged. For now, it has to do this.
3396 return type->isCARCBridgableType();
3400 ARCCastChecker(ASTContext &Context, ARCConversionTypeClass source,
3401 ARCConversionTypeClass target, bool diagnose)
3402 : Context(Context), SourceClass(source), TargetClass(target),
3403 Diagnose(diagnose) {}
3406 ACCResult Visit(Expr *e) {
3407 return super::Visit(e->IgnoreParens());
3410 ACCResult VisitStmt(Stmt *s) {
3414 /// Null pointer constants can be casted however you please.
3415 ACCResult VisitExpr(Expr *e) {
3416 if (e->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull))
3421 /// Objective-C string literals can be safely casted.
3422 ACCResult VisitObjCStringLiteral(ObjCStringLiteral *e) {
3423 // If we're casting to any retainable type, go ahead. Global
3424 // strings are immune to retains, so this is bottom.
3425 if (isAnyRetainable(TargetClass)) return ACC_bottom;
3430 /// Look through certain implicit and explicit casts.
3431 ACCResult VisitCastExpr(CastExpr *e) {
3432 switch (e->getCastKind()) {
3433 case CK_NullToPointer:
3437 case CK_LValueToRValue:
3439 case CK_CPointerToObjCPointerCast:
3440 case CK_BlockPointerToObjCPointerCast:
3441 case CK_AnyPointerToBlockPointerCast:
3442 return Visit(e->getSubExpr());
3449 /// Look through unary extension.
3450 ACCResult VisitUnaryExtension(UnaryOperator *e) {
3451 return Visit(e->getSubExpr());
3454 /// Ignore the LHS of a comma operator.
3455 ACCResult VisitBinComma(BinaryOperator *e) {
3456 return Visit(e->getRHS());
3459 /// Conditional operators are okay if both sides are okay.
3460 ACCResult VisitConditionalOperator(ConditionalOperator *e) {
3461 ACCResult left = Visit(e->getTrueExpr());
3462 if (left == ACC_invalid) return ACC_invalid;
3463 return merge(left, Visit(e->getFalseExpr()));
3466 /// Look through pseudo-objects.
3467 ACCResult VisitPseudoObjectExpr(PseudoObjectExpr *e) {
3468 // If we're getting here, we should always have a result.
3469 return Visit(e->getResultExpr());
3472 /// Statement expressions are okay if their result expression is okay.
3473 ACCResult VisitStmtExpr(StmtExpr *e) {
3474 return Visit(e->getSubStmt()->body_back());
3477 /// Some declaration references are okay.
3478 ACCResult VisitDeclRefExpr(DeclRefExpr *e) {
3479 VarDecl *var = dyn_cast<VarDecl>(e->getDecl());
3480 // References to global constants are okay.
3481 if (isAnyRetainable(TargetClass) &&
3482 isAnyRetainable(SourceClass) &&
3484 !var->hasDefinition(Context) &&
3485 var->getType().isConstQualified()) {
3487 // In system headers, they can also be assumed to be immune to retains.
3488 // These are things like 'kCFStringTransformToLatin'.
3489 if (Context.getSourceManager().isInSystemHeader(var->getLocation()))
3492 return ACC_plusZero;
3499 /// Some calls are okay.
3500 ACCResult VisitCallExpr(CallExpr *e) {
3501 if (FunctionDecl *fn = e->getDirectCallee())
3502 if (ACCResult result = checkCallToFunction(fn))
3505 return super::VisitCallExpr(e);
3508 ACCResult checkCallToFunction(FunctionDecl *fn) {
3509 // Require a CF*Ref return type.
3510 if (!isCFType(fn->getReturnType()))
3513 if (!isAnyRetainable(TargetClass))
3516 // Honor an explicit 'not retained' attribute.
3517 if (fn->hasAttr<CFReturnsNotRetainedAttr>())
3518 return ACC_plusZero;
3520 // Honor an explicit 'retained' attribute, except that for
3521 // now we're not going to permit implicit handling of +1 results,
3522 // because it's a bit frightening.
3523 if (fn->hasAttr<CFReturnsRetainedAttr>())
3524 return Diagnose ? ACC_plusOne
3525 : ACC_invalid; // ACC_plusOne if we start accepting this
3527 // Recognize this specific builtin function, which is used by CFSTR.
3528 unsigned builtinID = fn->getBuiltinID();
3529 if (builtinID == Builtin::BI__builtin___CFStringMakeConstantString)
3532 // Otherwise, don't do anything implicit with an unaudited function.
3533 if (!fn->hasAttr<CFAuditedTransferAttr>())
3536 // Otherwise, it's +0 unless it follows the create convention.
3537 if (ento::coreFoundation::followsCreateRule(fn))
3538 return Diagnose ? ACC_plusOne
3539 : ACC_invalid; // ACC_plusOne if we start accepting this
3541 return ACC_plusZero;
3544 ACCResult VisitObjCMessageExpr(ObjCMessageExpr *e) {
3545 return checkCallToMethod(e->getMethodDecl());
3548 ACCResult VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *e) {
3549 ObjCMethodDecl *method;
3550 if (e->isExplicitProperty())
3551 method = e->getExplicitProperty()->getGetterMethodDecl();
3553 method = e->getImplicitPropertyGetter();
3554 return checkCallToMethod(method);
3557 ACCResult checkCallToMethod(ObjCMethodDecl *method) {
3558 if (!method) return ACC_invalid;
3560 // Check for message sends to functions returning CF types. We
3561 // just obey the Cocoa conventions with these, even though the
3562 // return type is CF.
3563 if (!isAnyRetainable(TargetClass) || !isCFType(method->getReturnType()))
3566 // If the method is explicitly marked not-retained, it's +0.
3567 if (method->hasAttr<CFReturnsNotRetainedAttr>())
3568 return ACC_plusZero;
3570 // If the method is explicitly marked as returning retained, or its
3571 // selector follows a +1 Cocoa convention, treat it as +1.
3572 if (method->hasAttr<CFReturnsRetainedAttr>())
3575 switch (method->getSelector().getMethodFamily()) {
3578 case OMF_mutableCopy:
3583 // Otherwise, treat it as +0.
3584 return ACC_plusZero;
3588 } // end anonymous namespace
3590 bool Sema::isKnownName(StringRef name) {
3593 LookupResult R(*this, &Context.Idents.get(name), SourceLocation(),
3594 Sema::LookupOrdinaryName);
3595 return LookupName(R, TUScope, false);
3598 static void addFixitForObjCARCConversion(Sema &S,
3599 DiagnosticBuilder &DiagB,
3600 Sema::CheckedConversionKind CCK,
3601 SourceLocation afterLParen,
3605 const char *bridgeKeyword,
3606 const char *CFBridgeName) {
3607 // We handle C-style and implicit casts here.
3609 case Sema::CCK_ImplicitConversion:
3610 case Sema::CCK_ForBuiltinOverloadedOp:
3611 case Sema::CCK_CStyleCast:
3612 case Sema::CCK_OtherCast:
3614 case Sema::CCK_FunctionalCast:
3619 if (CCK == Sema::CCK_OtherCast) {
3620 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3621 SourceRange range(NCE->getOperatorLoc(),
3622 NCE->getAngleBrackets().getEnd());
3623 SmallString<32> BridgeCall;
3625 SourceManager &SM = S.getSourceManager();
3626 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3627 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3630 BridgeCall += CFBridgeName;
3631 DiagB.AddFixItHint(FixItHint::CreateReplacement(range, BridgeCall));
3635 Expr *castedE = castExpr;
3636 if (CStyleCastExpr *CCE = dyn_cast<CStyleCastExpr>(castedE))
3637 castedE = CCE->getSubExpr();
3638 castedE = castedE->IgnoreImpCasts();
3639 SourceRange range = castedE->getSourceRange();
3641 SmallString<32> BridgeCall;
3643 SourceManager &SM = S.getSourceManager();
3644 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3645 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3648 BridgeCall += CFBridgeName;
3650 if (isa<ParenExpr>(castedE)) {
3651 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3655 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3657 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3658 S.getLocForEndOfToken(range.getEnd()),
3664 if (CCK == Sema::CCK_CStyleCast) {
3665 DiagB.AddFixItHint(FixItHint::CreateInsertion(afterLParen, bridgeKeyword));
3666 } else if (CCK == Sema::CCK_OtherCast) {
3667 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3668 std::string castCode = "(";
3669 castCode += bridgeKeyword;
3670 castCode += castType.getAsString();
3672 SourceRange Range(NCE->getOperatorLoc(),
3673 NCE->getAngleBrackets().getEnd());
3674 DiagB.AddFixItHint(FixItHint::CreateReplacement(Range, castCode));
3677 std::string castCode = "(";
3678 castCode += bridgeKeyword;
3679 castCode += castType.getAsString();
3681 Expr *castedE = castExpr->IgnoreImpCasts();
3682 SourceRange range = castedE->getSourceRange();
3683 if (isa<ParenExpr>(castedE)) {
3684 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3688 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3690 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3691 S.getLocForEndOfToken(range.getEnd()),
3697 template <typename T>
3698 static inline T *getObjCBridgeAttr(const TypedefType *TD) {
3699 TypedefNameDecl *TDNDecl = TD->getDecl();
3700 QualType QT = TDNDecl->getUnderlyingType();
3701 if (QT->isPointerType()) {
3702 QT = QT->getPointeeType();
3703 if (const RecordType *RT = QT->getAs<RecordType>())
3704 if (RecordDecl *RD = RT->getDecl()->getMostRecentDecl())
3705 return RD->getAttr<T>();
3710 static ObjCBridgeRelatedAttr *ObjCBridgeRelatedAttrFromType(QualType T,
3711 TypedefNameDecl *&TDNDecl) {
3712 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3713 TDNDecl = TD->getDecl();
3714 if (ObjCBridgeRelatedAttr *ObjCBAttr =
3715 getObjCBridgeAttr<ObjCBridgeRelatedAttr>(TD))
3717 T = TDNDecl->getUnderlyingType();
3723 diagnoseObjCARCConversion(Sema &S, SourceRange castRange,
3724 QualType castType, ARCConversionTypeClass castACTC,
3725 Expr *castExpr, Expr *realCast,
3726 ARCConversionTypeClass exprACTC,
3727 Sema::CheckedConversionKind CCK) {
3728 SourceLocation loc =
3729 (castRange.isValid() ? castRange.getBegin() : castExpr->getExprLoc());
3731 if (S.makeUnavailableInSystemHeader(loc,
3732 UnavailableAttr::IR_ARCForbiddenConversion))
3735 QualType castExprType = castExpr->getType();
3736 // Defer emitting a diagnostic for bridge-related casts; that will be
3737 // handled by CheckObjCBridgeRelatedConversions.
3738 TypedefNameDecl *TDNDecl = nullptr;
3739 if ((castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable &&
3740 ObjCBridgeRelatedAttrFromType(castType, TDNDecl)) ||
3741 (exprACTC == ACTC_coreFoundation && castACTC == ACTC_retainable &&
3742 ObjCBridgeRelatedAttrFromType(castExprType, TDNDecl)))
3745 unsigned srcKind = 0;
3748 case ACTC_coreFoundation:
3750 srcKind = (castExprType->isPointerType() ? 1 : 0);
3752 case ACTC_retainable:
3753 srcKind = (castExprType->isBlockPointerType() ? 2 : 3);
3755 case ACTC_indirectRetainable:
3760 // Check whether this could be fixed with a bridge cast.
3761 SourceLocation afterLParen = S.getLocForEndOfToken(castRange.getBegin());
3762 SourceLocation noteLoc = afterLParen.isValid() ? afterLParen : loc;
3764 unsigned convKindForDiag = Sema::isCast(CCK) ? 0 : 1;
3766 // Bridge from an ARC type to a CF type.
3767 if (castACTC == ACTC_retainable && isAnyRetainable(exprACTC)) {
3769 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3771 << 2 // of C pointer type
3773 << unsigned(castType->isBlockPointerType()) // to ObjC|block type
3776 << castExpr->getSourceRange();
3777 bool br = S.isKnownName("CFBridgingRelease");
3778 ACCResult CreateRule =
3779 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3780 assert(CreateRule != ACC_bottom && "This cast should already be accepted.");
3781 if (CreateRule != ACC_plusOne)
3783 DiagnosticBuilder DiagB =
3784 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3785 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3787 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3788 castType, castExpr, realCast, "__bridge ",
3791 if (CreateRule != ACC_plusZero)
3793 DiagnosticBuilder DiagB =
3794 (CCK == Sema::CCK_OtherCast && !br) ?
3795 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_transfer) << castExprType :
3796 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3797 diag::note_arc_bridge_transfer)
3798 << castExprType << br;
3800 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3801 castType, castExpr, realCast, "__bridge_transfer ",
3802 br ? "CFBridgingRelease" : nullptr);
3808 // Bridge from a CF type to an ARC type.
3809 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC)) {
3810 bool br = S.isKnownName("CFBridgingRetain");
3811 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3813 << unsigned(castExprType->isBlockPointerType()) // of ObjC|block type
3815 << 2 // to C pointer type
3818 << castExpr->getSourceRange();
3819 ACCResult CreateRule =
3820 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3821 assert(CreateRule != ACC_bottom && "This cast should already be accepted.");
3822 if (CreateRule != ACC_plusOne)
3824 DiagnosticBuilder DiagB =
3825 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3826 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3827 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3828 castType, castExpr, realCast, "__bridge ",
3831 if (CreateRule != ACC_plusZero)
3833 DiagnosticBuilder DiagB =
3834 (CCK == Sema::CCK_OtherCast && !br) ?
3835 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_retained) << castType :
3836 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3837 diag::note_arc_bridge_retained)
3840 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3841 castType, castExpr, realCast, "__bridge_retained ",
3842 br ? "CFBridgingRetain" : nullptr);
3848 S.Diag(loc, diag::err_arc_mismatched_cast)
3850 << srcKind << castExprType << castType
3851 << castRange << castExpr->getSourceRange();
3854 template <typename TB>
3855 static bool CheckObjCBridgeNSCast(Sema &S, QualType castType, Expr *castExpr,
3856 bool &HadTheAttribute, bool warn) {
3857 QualType T = castExpr->getType();
3858 HadTheAttribute = false;
3859 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3860 TypedefNameDecl *TDNDecl = TD->getDecl();
3861 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3862 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3863 HadTheAttribute = true;
3864 if (Parm->isStr("id"))
3867 NamedDecl *Target = nullptr;
3868 // Check for an existing type with this name.
3869 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3870 Sema::LookupOrdinaryName);
3871 if (S.LookupName(R, S.TUScope)) {
3872 Target = R.getFoundDecl();
3873 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3874 ObjCInterfaceDecl *ExprClass = cast<ObjCInterfaceDecl>(Target);
3875 if (const ObjCObjectPointerType *InterfacePointerType =
3876 castType->getAsObjCInterfacePointerType()) {
3877 ObjCInterfaceDecl *CastClass
3878 = InterfacePointerType->getObjectType()->getInterface();
3879 if ((CastClass == ExprClass) ||
3880 (CastClass && CastClass->isSuperClassOf(ExprClass)))
3883 S.Diag(castExpr->getBeginLoc(), diag::warn_objc_invalid_bridge)
3884 << T << Target->getName() << castType->getPointeeType();
3886 } else if (castType->isObjCIdType() ||
3887 (S.Context.ObjCObjectAdoptsQTypeProtocols(
3888 castType, ExprClass)))
3889 // ok to cast to 'id'.
3890 // casting to id<p-list> is ok if bridge type adopts all of
3891 // p-list protocols.
3895 S.Diag(castExpr->getBeginLoc(), diag::warn_objc_invalid_bridge)
3896 << T << Target->getName() << castType;
3897 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3898 S.Diag(Target->getBeginLoc(), diag::note_declared_at);
3903 } else if (!castType->isObjCIdType()) {
3904 S.Diag(castExpr->getBeginLoc(),
3905 diag::err_objc_cf_bridged_not_interface)
3906 << castExpr->getType() << Parm;
3907 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3909 S.Diag(Target->getBeginLoc(), diag::note_declared_at);
3915 T = TDNDecl->getUnderlyingType();
3920 template <typename TB>
3921 static bool CheckObjCBridgeCFCast(Sema &S, QualType castType, Expr *castExpr,
3922 bool &HadTheAttribute, bool warn) {
3923 QualType T = castType;
3924 HadTheAttribute = false;
3925 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3926 TypedefNameDecl *TDNDecl = TD->getDecl();
3927 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3928 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3929 HadTheAttribute = true;
3930 if (Parm->isStr("id"))
3933 NamedDecl *Target = nullptr;
3934 // Check for an existing type with this name.
3935 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3936 Sema::LookupOrdinaryName);
3937 if (S.LookupName(R, S.TUScope)) {
3938 Target = R.getFoundDecl();
3939 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3940 ObjCInterfaceDecl *CastClass = cast<ObjCInterfaceDecl>(Target);
3941 if (const ObjCObjectPointerType *InterfacePointerType =
3942 castExpr->getType()->getAsObjCInterfacePointerType()) {
3943 ObjCInterfaceDecl *ExprClass
3944 = InterfacePointerType->getObjectType()->getInterface();
3945 if ((CastClass == ExprClass) ||
3946 (ExprClass && CastClass->isSuperClassOf(ExprClass)))
3949 S.Diag(castExpr->getBeginLoc(),
3950 diag::warn_objc_invalid_bridge_to_cf)
3951 << castExpr->getType()->getPointeeType() << T;
3952 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3955 } else if (castExpr->getType()->isObjCIdType() ||
3956 (S.Context.QIdProtocolsAdoptObjCObjectProtocols(
3957 castExpr->getType(), CastClass)))
3958 // ok to cast an 'id' expression to a CFtype.
3959 // ok to cast an 'id<plist>' expression to CFtype provided plist
3960 // adopts all of CFtype's ObjetiveC's class plist.
3964 S.Diag(castExpr->getBeginLoc(),
3965 diag::warn_objc_invalid_bridge_to_cf)
3966 << castExpr->getType() << castType;
3967 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3968 S.Diag(Target->getBeginLoc(), diag::note_declared_at);
3974 S.Diag(castExpr->getBeginLoc(),
3975 diag::err_objc_ns_bridged_invalid_cfobject)
3976 << castExpr->getType() << castType;
3977 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
3979 S.Diag(Target->getBeginLoc(), diag::note_declared_at);
3984 T = TDNDecl->getUnderlyingType();
3989 void Sema::CheckTollFreeBridgeCast(QualType castType, Expr *castExpr) {
3990 if (!getLangOpts().ObjC)
3992 // warn in presence of __bridge casting to or from a toll free bridge cast.
3993 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExpr->getType());
3994 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
3995 if (castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) {
3996 bool HasObjCBridgeAttr;
3997 bool ObjCBridgeAttrWillNotWarn =
3998 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
4000 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
4002 bool HasObjCBridgeMutableAttr;
4003 bool ObjCBridgeMutableAttrWillNotWarn =
4004 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
4005 HasObjCBridgeMutableAttr, false);
4006 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
4009 if (HasObjCBridgeAttr)
4010 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
4012 else if (HasObjCBridgeMutableAttr)
4013 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
4014 HasObjCBridgeMutableAttr, true);
4016 else if (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable) {
4017 bool HasObjCBridgeAttr;
4018 bool ObjCBridgeAttrWillNotWarn =
4019 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
4021 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
4023 bool HasObjCBridgeMutableAttr;
4024 bool ObjCBridgeMutableAttrWillNotWarn =
4025 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
4026 HasObjCBridgeMutableAttr, false);
4027 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
4030 if (HasObjCBridgeAttr)
4031 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
4033 else if (HasObjCBridgeMutableAttr)
4034 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
4035 HasObjCBridgeMutableAttr, true);
4039 void Sema::CheckObjCBridgeRelatedCast(QualType castType, Expr *castExpr) {
4040 QualType SrcType = castExpr->getType();
4041 if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(castExpr)) {
4042 if (PRE->isExplicitProperty()) {
4043 if (ObjCPropertyDecl *PDecl = PRE->getExplicitProperty())
4044 SrcType = PDecl->getType();
4046 else if (PRE->isImplicitProperty()) {
4047 if (ObjCMethodDecl *Getter = PRE->getImplicitPropertyGetter())
4048 SrcType = Getter->getReturnType();
4052 ARCConversionTypeClass srcExprACTC = classifyTypeForARCConversion(SrcType);
4053 ARCConversionTypeClass castExprACTC = classifyTypeForARCConversion(castType);
4054 if (srcExprACTC != ACTC_retainable || castExprACTC != ACTC_coreFoundation)
4056 CheckObjCBridgeRelatedConversions(castExpr->getBeginLoc(), castType, SrcType,
4060 bool Sema::CheckTollFreeBridgeStaticCast(QualType castType, Expr *castExpr,
4062 if (!getLangOpts().ObjC)
4064 ARCConversionTypeClass exprACTC =
4065 classifyTypeForARCConversion(castExpr->getType());
4066 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
4067 if ((castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) ||
4068 (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable)) {
4069 CheckTollFreeBridgeCast(castType, castExpr);
4070 Kind = (castACTC == ACTC_coreFoundation) ? CK_BitCast
4071 : CK_CPointerToObjCPointerCast;
4077 bool Sema::checkObjCBridgeRelatedComponents(SourceLocation Loc,
4078 QualType DestType, QualType SrcType,
4079 ObjCInterfaceDecl *&RelatedClass,
4080 ObjCMethodDecl *&ClassMethod,
4081 ObjCMethodDecl *&InstanceMethod,
4082 TypedefNameDecl *&TDNDecl,
4083 bool CfToNs, bool Diagnose) {
4084 QualType T = CfToNs ? SrcType : DestType;
4085 ObjCBridgeRelatedAttr *ObjCBAttr = ObjCBridgeRelatedAttrFromType(T, TDNDecl);
4089 IdentifierInfo *RCId = ObjCBAttr->getRelatedClass();
4090 IdentifierInfo *CMId = ObjCBAttr->getClassMethod();
4091 IdentifierInfo *IMId = ObjCBAttr->getInstanceMethod();
4094 NamedDecl *Target = nullptr;
4095 // Check for an existing type with this name.
4096 LookupResult R(*this, DeclarationName(RCId), SourceLocation(),
4097 Sema::LookupOrdinaryName);
4098 if (!LookupName(R, TUScope)) {
4100 Diag(Loc, diag::err_objc_bridged_related_invalid_class) << RCId
4101 << SrcType << DestType;
4102 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4106 Target = R.getFoundDecl();
4107 if (Target && isa<ObjCInterfaceDecl>(Target))
4108 RelatedClass = cast<ObjCInterfaceDecl>(Target);
4111 Diag(Loc, diag::err_objc_bridged_related_invalid_class_name) << RCId
4112 << SrcType << DestType;
4113 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4115 Diag(Target->getBeginLoc(), diag::note_declared_at);
4120 // Check for an existing class method with the given selector name.
4121 if (CfToNs && CMId) {
4122 Selector Sel = Context.Selectors.getUnarySelector(CMId);
4123 ClassMethod = RelatedClass->lookupMethod(Sel, false);
4126 Diag(Loc, diag::err_objc_bridged_related_known_method)
4127 << SrcType << DestType << Sel << false;
4128 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4134 // Check for an existing instance method with the given selector name.
4135 if (!CfToNs && IMId) {
4136 Selector Sel = Context.Selectors.getNullarySelector(IMId);
4137 InstanceMethod = RelatedClass->lookupMethod(Sel, true);
4138 if (!InstanceMethod) {
4140 Diag(Loc, diag::err_objc_bridged_related_known_method)
4141 << SrcType << DestType << Sel << true;
4142 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4151 Sema::CheckObjCBridgeRelatedConversions(SourceLocation Loc,
4152 QualType DestType, QualType SrcType,
4153 Expr *&SrcExpr, bool Diagnose) {
4154 ARCConversionTypeClass rhsExprACTC = classifyTypeForARCConversion(SrcType);
4155 ARCConversionTypeClass lhsExprACTC = classifyTypeForARCConversion(DestType);
4156 bool CfToNs = (rhsExprACTC == ACTC_coreFoundation && lhsExprACTC == ACTC_retainable);
4157 bool NsToCf = (rhsExprACTC == ACTC_retainable && lhsExprACTC == ACTC_coreFoundation);
4158 if (!CfToNs && !NsToCf)
4161 ObjCInterfaceDecl *RelatedClass;
4162 ObjCMethodDecl *ClassMethod = nullptr;
4163 ObjCMethodDecl *InstanceMethod = nullptr;
4164 TypedefNameDecl *TDNDecl = nullptr;
4165 if (!checkObjCBridgeRelatedComponents(Loc, DestType, SrcType, RelatedClass,
4166 ClassMethod, InstanceMethod, TDNDecl,
4171 // Implicit conversion from CF to ObjC object is needed.
4174 std::string ExpressionString = "[";
4175 ExpressionString += RelatedClass->getNameAsString();
4176 ExpressionString += " ";
4177 ExpressionString += ClassMethod->getSelector().getAsString();
4178 SourceLocation SrcExprEndLoc =
4179 getLocForEndOfToken(SrcExpr->getEndLoc());
4180 // Provide a fixit: [RelatedClass ClassMethod SrcExpr]
4181 Diag(Loc, diag::err_objc_bridged_related_known_method)
4182 << SrcType << DestType << ClassMethod->getSelector() << false
4183 << FixItHint::CreateInsertion(SrcExpr->getBeginLoc(),
4185 << FixItHint::CreateInsertion(SrcExprEndLoc, "]");
4186 Diag(RelatedClass->getBeginLoc(), diag::note_declared_at);
4187 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4189 QualType receiverType = Context.getObjCInterfaceType(RelatedClass);
4191 Expr *args[] = { SrcExpr };
4192 ExprResult msg = BuildClassMessageImplicit(receiverType, false,
4193 ClassMethod->getLocation(),
4194 ClassMethod->getSelector(), ClassMethod,
4195 MultiExprArg(args, 1));
4196 SrcExpr = msg.get();
4202 // Implicit conversion from ObjC type to CF object is needed.
4203 if (InstanceMethod) {
4205 std::string ExpressionString;
4206 SourceLocation SrcExprEndLoc =
4207 getLocForEndOfToken(SrcExpr->getEndLoc());
4208 if (InstanceMethod->isPropertyAccessor())
4209 if (const ObjCPropertyDecl *PDecl =
4210 InstanceMethod->findPropertyDecl()) {
4211 // fixit: ObjectExpr.propertyname when it is aproperty accessor.
4212 ExpressionString = ".";
4213 ExpressionString += PDecl->getNameAsString();
4214 Diag(Loc, diag::err_objc_bridged_related_known_method)
4215 << SrcType << DestType << InstanceMethod->getSelector() << true
4216 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
4218 if (ExpressionString.empty()) {
4219 // Provide a fixit: [ObjectExpr InstanceMethod]
4220 ExpressionString = " ";
4221 ExpressionString += InstanceMethod->getSelector().getAsString();
4222 ExpressionString += "]";
4224 Diag(Loc, diag::err_objc_bridged_related_known_method)
4225 << SrcType << DestType << InstanceMethod->getSelector() << true
4226 << FixItHint::CreateInsertion(SrcExpr->getBeginLoc(), "[")
4227 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
4229 Diag(RelatedClass->getBeginLoc(), diag::note_declared_at);
4230 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at);
4233 BuildInstanceMessageImplicit(SrcExpr, SrcType,
4234 InstanceMethod->getLocation(),
4235 InstanceMethod->getSelector(),
4236 InstanceMethod, None);
4237 SrcExpr = msg.get();
4245 Sema::ARCConversionResult
4246 Sema::CheckObjCConversion(SourceRange castRange, QualType castType,
4247 Expr *&castExpr, CheckedConversionKind CCK,
4248 bool Diagnose, bool DiagnoseCFAudited,
4249 BinaryOperatorKind Opc) {
4250 QualType castExprType = castExpr->getType();
4252 // For the purposes of the classification, we assume reference types
4253 // will bind to temporaries.
4254 QualType effCastType = castType;
4255 if (const ReferenceType *ref = castType->getAs<ReferenceType>())
4256 effCastType = ref->getPointeeType();
4258 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExprType);
4259 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(effCastType);
4260 if (exprACTC == castACTC) {
4261 // Check for viability and report error if casting an rvalue to a
4262 // life-time qualifier.
4263 if (castACTC == ACTC_retainable &&
4264 (CCK == CCK_CStyleCast || CCK == CCK_OtherCast) &&
4265 castType != castExprType) {
4266 const Type *DT = castType.getTypePtr();
4267 QualType QDT = castType;
4268 // We desugar some types but not others. We ignore those
4269 // that cannot happen in a cast; i.e. auto, and those which
4270 // should not be de-sugared; i.e typedef.
4271 if (const ParenType *PT = dyn_cast<ParenType>(DT))
4272 QDT = PT->desugar();
4273 else if (const TypeOfType *TP = dyn_cast<TypeOfType>(DT))
4274 QDT = TP->desugar();
4275 else if (const AttributedType *AT = dyn_cast<AttributedType>(DT))
4276 QDT = AT->desugar();
4277 if (QDT != castType &&
4278 QDT.getObjCLifetime() != Qualifiers::OCL_None) {
4280 SourceLocation loc = (castRange.isValid() ? castRange.getBegin()
4281 : castExpr->getExprLoc());
4282 Diag(loc, diag::err_arc_nolifetime_behavior);
4290 // The life-time qualifier cast check above is all we need for ObjCWeak.
4291 // ObjCAutoRefCount has more restrictions on what is legal.
4292 if (!getLangOpts().ObjCAutoRefCount)
4295 if (isAnyCLike(exprACTC) && isAnyCLike(castACTC)) return ACR_okay;
4297 // Allow all of these types to be cast to integer types (but not
4299 if (castACTC == ACTC_none && castType->isIntegralType(Context))
4302 // Allow casts between pointers to lifetime types (e.g., __strong id*)
4303 // and pointers to void (e.g., cv void *). Casting from void* to lifetime*
4304 // must be explicit.
4305 if (exprACTC == ACTC_indirectRetainable && castACTC == ACTC_voidPtr)
4307 if (castACTC == ACTC_indirectRetainable && exprACTC == ACTC_voidPtr &&
4311 switch (ARCCastChecker(Context, exprACTC, castACTC, false).Visit(castExpr)) {
4312 // For invalid casts, fall through.
4316 // Do nothing for both bottom and +0.
4321 // If the result is +1, consume it here.
4323 castExpr = ImplicitCastExpr::Create(Context, castExpr->getType(),
4324 CK_ARCConsumeObject, castExpr,
4325 nullptr, VK_RValue);
4326 Cleanup.setExprNeedsCleanups(true);
4330 // If this is a non-implicit cast from id or block type to a
4331 // CoreFoundation type, delay complaining in case the cast is used
4332 // in an acceptable context.
4333 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC) && isCast(CCK))
4334 return ACR_unbridged;
4336 // Issue a diagnostic about a missing @-sign when implicit casting a cstring
4337 // to 'NSString *', instead of falling through to report a "bridge cast"
4339 if (castACTC == ACTC_retainable && exprACTC == ACTC_none &&
4340 ConversionToObjCStringLiteralCheck(castType, castExpr, Diagnose))
4343 // Do not issue "bridge cast" diagnostic when implicit casting
4344 // a retainable object to a CF type parameter belonging to an audited
4345 // CF API function. Let caller issue a normal type mismatched diagnostic
4347 if ((!DiagnoseCFAudited || exprACTC != ACTC_retainable ||
4348 castACTC != ACTC_coreFoundation) &&
4349 !(exprACTC == ACTC_voidPtr && castACTC == ACTC_retainable &&
4350 (Opc == BO_NE || Opc == BO_EQ))) {
4352 diagnoseObjCARCConversion(*this, castRange, castType, castACTC, castExpr,
4353 castExpr, exprACTC, CCK);
4359 /// Given that we saw an expression with the ARCUnbridgedCastTy
4360 /// placeholder type, complain bitterly.
4361 void Sema::diagnoseARCUnbridgedCast(Expr *e) {
4362 // We expect the spurious ImplicitCastExpr to already have been stripped.
4363 assert(!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast));
4364 CastExpr *realCast = cast<CastExpr>(e->IgnoreParens());
4366 SourceRange castRange;
4368 CheckedConversionKind CCK;
4370 if (CStyleCastExpr *cast = dyn_cast<CStyleCastExpr>(realCast)) {
4371 castRange = SourceRange(cast->getLParenLoc(), cast->getRParenLoc());
4372 castType = cast->getTypeAsWritten();
4373 CCK = CCK_CStyleCast;
4374 } else if (ExplicitCastExpr *cast = dyn_cast<ExplicitCastExpr>(realCast)) {
4375 castRange = cast->getTypeInfoAsWritten()->getTypeLoc().getSourceRange();
4376 castType = cast->getTypeAsWritten();
4377 CCK = CCK_OtherCast;
4379 llvm_unreachable("Unexpected ImplicitCastExpr");
4382 ARCConversionTypeClass castACTC =
4383 classifyTypeForARCConversion(castType.getNonReferenceType());
4385 Expr *castExpr = realCast->getSubExpr();
4386 assert(classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable);
4388 diagnoseObjCARCConversion(*this, castRange, castType, castACTC,
4389 castExpr, realCast, ACTC_retainable, CCK);
4392 /// stripARCUnbridgedCast - Given an expression of ARCUnbridgedCast
4393 /// type, remove the placeholder cast.
4394 Expr *Sema::stripARCUnbridgedCast(Expr *e) {
4395 assert(e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast));
4397 if (ParenExpr *pe = dyn_cast<ParenExpr>(e)) {
4398 Expr *sub = stripARCUnbridgedCast(pe->getSubExpr());
4399 return new (Context) ParenExpr(pe->getLParen(), pe->getRParen(), sub);
4400 } else if (UnaryOperator *uo = dyn_cast<UnaryOperator>(e)) {
4401 assert(uo->getOpcode() == UO_Extension);
4402 Expr *sub = stripARCUnbridgedCast(uo->getSubExpr());
4403 return new (Context)
4404 UnaryOperator(sub, UO_Extension, sub->getType(), sub->getValueKind(),
4405 sub->getObjectKind(), uo->getOperatorLoc(), false);
4406 } else if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) {
4407 assert(!gse->isResultDependent());
4409 unsigned n = gse->getNumAssocs();
4410 SmallVector<Expr *, 4> subExprs;
4411 SmallVector<TypeSourceInfo *, 4> subTypes;
4412 subExprs.reserve(n);
4413 subTypes.reserve(n);
4414 for (const GenericSelectionExpr::Association assoc : gse->associations()) {
4415 subTypes.push_back(assoc.getTypeSourceInfo());
4416 Expr *sub = assoc.getAssociationExpr();
4417 if (assoc.isSelected())
4418 sub = stripARCUnbridgedCast(sub);
4419 subExprs.push_back(sub);
4422 return GenericSelectionExpr::Create(
4423 Context, gse->getGenericLoc(), gse->getControllingExpr(), subTypes,
4424 subExprs, gse->getDefaultLoc(), gse->getRParenLoc(),
4425 gse->containsUnexpandedParameterPack(), gse->getResultIndex());
4427 assert(isa<ImplicitCastExpr>(e) && "bad form of unbridged cast!");
4428 return cast<ImplicitCastExpr>(e)->getSubExpr();
4432 bool Sema::CheckObjCARCUnavailableWeakConversion(QualType castType,
4433 QualType exprType) {
4434 QualType canCastType =
4435 Context.getCanonicalType(castType).getUnqualifiedType();
4436 QualType canExprType =
4437 Context.getCanonicalType(exprType).getUnqualifiedType();
4438 if (isa<ObjCObjectPointerType>(canCastType) &&
4439 castType.getObjCLifetime() == Qualifiers::OCL_Weak &&
4440 canExprType->isObjCObjectPointerType()) {
4441 if (const ObjCObjectPointerType *ObjT =
4442 canExprType->getAs<ObjCObjectPointerType>())
4443 if (const ObjCInterfaceDecl *ObjI = ObjT->getInterfaceDecl())
4444 return !ObjI->isArcWeakrefUnavailable();
4449 /// Look for an ObjCReclaimReturnedObject cast and destroy it.
4450 static Expr *maybeUndoReclaimObject(Expr *e) {
4451 Expr *curExpr = e, *prevExpr = nullptr;
4453 // Walk down the expression until we hit an implicit cast of kind
4454 // ARCReclaimReturnedObject or an Expr that is neither a Paren nor a Cast.
4456 if (auto *pe = dyn_cast<ParenExpr>(curExpr)) {
4458 curExpr = pe->getSubExpr();
4462 if (auto *ce = dyn_cast<CastExpr>(curExpr)) {
4463 if (auto *ice = dyn_cast<ImplicitCastExpr>(ce))
4464 if (ice->getCastKind() == CK_ARCReclaimReturnedObject) {
4466 return ice->getSubExpr();
4467 if (auto *pe = dyn_cast<ParenExpr>(prevExpr))
4468 pe->setSubExpr(ice->getSubExpr());
4470 cast<CastExpr>(prevExpr)->setSubExpr(ice->getSubExpr());
4475 curExpr = ce->getSubExpr();
4479 // Break out of the loop if curExpr is neither a Paren nor a Cast.
4486 ExprResult Sema::BuildObjCBridgedCast(SourceLocation LParenLoc,
4487 ObjCBridgeCastKind Kind,
4488 SourceLocation BridgeKeywordLoc,
4489 TypeSourceInfo *TSInfo,
4491 ExprResult SubResult = UsualUnaryConversions(SubExpr);
4492 if (SubResult.isInvalid()) return ExprError();
4493 SubExpr = SubResult.get();
4495 QualType T = TSInfo->getType();
4496 QualType FromType = SubExpr->getType();
4500 bool MustConsume = false;
4501 if (T->isDependentType() || SubExpr->isTypeDependent()) {
4502 // Okay: we'll build a dependent expression type.
4504 } else if (T->isObjCARCBridgableType() && FromType->isCARCBridgableType()) {
4506 CK = (T->isBlockPointerType() ? CK_AnyPointerToBlockPointerCast
4507 : CK_CPointerToObjCPointerCast);
4512 case OBC_BridgeRetained: {
4513 bool br = isKnownName("CFBridgingRelease");
4514 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4517 << (T->isBlockPointerType()? 1 : 0)
4519 << SubExpr->getSourceRange()
4521 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4522 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge");
4523 Diag(BridgeKeywordLoc, diag::note_arc_bridge_transfer)
4525 << FixItHint::CreateReplacement(BridgeKeywordLoc,
4526 br ? "CFBridgingRelease "
4527 : "__bridge_transfer ");
4533 case OBC_BridgeTransfer:
4534 // We must consume the Objective-C object produced by the cast.
4538 } else if (T->isCARCBridgableType() && FromType->isObjCARCBridgableType()) {
4543 // Reclaiming a value that's going to be __bridge-casted to CF
4544 // is very dangerous, so we don't do it.
4545 SubExpr = maybeUndoReclaimObject(SubExpr);
4548 case OBC_BridgeRetained:
4549 // Produce the object before casting it.
4550 SubExpr = ImplicitCastExpr::Create(Context, FromType,
4551 CK_ARCProduceObject,
4552 SubExpr, nullptr, VK_RValue);
4555 case OBC_BridgeTransfer: {
4556 bool br = isKnownName("CFBridgingRetain");
4557 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4558 << (FromType->isBlockPointerType()? 1 : 0)
4562 << SubExpr->getSourceRange()
4565 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4566 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge ");
4567 Diag(BridgeKeywordLoc, diag::note_arc_bridge_retained)
4569 << FixItHint::CreateReplacement(BridgeKeywordLoc,
4570 br ? "CFBridgingRetain " : "__bridge_retained");
4577 Diag(LParenLoc, diag::err_arc_bridge_cast_incompatible)
4578 << FromType << T << Kind
4579 << SubExpr->getSourceRange()
4580 << TSInfo->getTypeLoc().getSourceRange();
4584 Expr *Result = new (Context) ObjCBridgedCastExpr(LParenLoc, Kind, CK,
4589 Cleanup.setExprNeedsCleanups(true);
4590 Result = ImplicitCastExpr::Create(Context, T, CK_ARCConsumeObject, Result,
4591 nullptr, VK_RValue);
4597 ExprResult Sema::ActOnObjCBridgedCast(Scope *S,
4598 SourceLocation LParenLoc,
4599 ObjCBridgeCastKind Kind,
4600 SourceLocation BridgeKeywordLoc,
4602 SourceLocation RParenLoc,
4604 TypeSourceInfo *TSInfo = nullptr;
4605 QualType T = GetTypeFromParser(Type, &TSInfo);
4606 if (Kind == OBC_Bridge)
4607 CheckTollFreeBridgeCast(T, SubExpr);
4609 TSInfo = Context.getTrivialTypeSourceInfo(T, LParenLoc);
4610 return BuildObjCBridgedCast(LParenLoc, Kind, BridgeKeywordLoc, TSInfo,