1 //===--- SemaExprObjC.cpp - Semantic Analysis for ObjC Expressions --------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements semantic analysis for Objective-C expressions.
12 //===----------------------------------------------------------------------===//
14 #include "clang/Sema/SemaInternal.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/DeclObjC.h"
17 #include "clang/AST/ExprObjC.h"
18 #include "clang/AST/StmtVisitor.h"
19 #include "clang/AST/TypeLoc.h"
20 #include "clang/Analysis/DomainSpecific/CocoaConventions.h"
21 #include "clang/Edit/Commit.h"
22 #include "clang/Edit/Rewriters.h"
23 #include "clang/Lex/Preprocessor.h"
24 #include "clang/Sema/Initialization.h"
25 #include "clang/Sema/Lookup.h"
26 #include "clang/Sema/Scope.h"
27 #include "clang/Sema/ScopeInfo.h"
28 #include "llvm/ADT/SmallString.h"
30 using namespace clang;
32 using llvm::makeArrayRef;
34 ExprResult Sema::ParseObjCStringLiteral(SourceLocation *AtLocs,
35 ArrayRef<Expr *> Strings) {
36 // Most ObjC strings are formed out of a single piece. However, we *can*
37 // have strings formed out of multiple @ strings with multiple pptokens in
38 // each one, e.g. @"foo" "bar" @"baz" "qux" which need to be turned into one
39 // StringLiteral for ObjCStringLiteral to hold onto.
40 StringLiteral *S = cast<StringLiteral>(Strings[0]);
42 // If we have a multi-part string, merge it all together.
43 if (Strings.size() != 1) {
44 // Concatenate objc strings.
45 SmallString<128> StrBuf;
46 SmallVector<SourceLocation, 8> StrLocs;
48 for (Expr *E : Strings) {
49 S = cast<StringLiteral>(E);
51 // ObjC strings can't be wide or UTF.
53 Diag(S->getLocStart(), diag::err_cfstring_literal_not_string_constant)
54 << S->getSourceRange();
59 StrBuf += S->getString();
61 // Get the locations of the string tokens.
62 StrLocs.append(S->tokloc_begin(), S->tokloc_end());
65 // Create the aggregate string with the appropriate content and location
67 const ConstantArrayType *CAT = Context.getAsConstantArrayType(S->getType());
68 assert(CAT && "String literal not of constant array type!");
69 QualType StrTy = Context.getConstantArrayType(
70 CAT->getElementType(), llvm::APInt(32, StrBuf.size() + 1),
71 CAT->getSizeModifier(), CAT->getIndexTypeCVRQualifiers());
72 S = StringLiteral::Create(Context, StrBuf, StringLiteral::Ascii,
73 /*Pascal=*/false, StrTy, &StrLocs[0],
77 return BuildObjCStringLiteral(AtLocs[0], S);
80 ExprResult Sema::BuildObjCStringLiteral(SourceLocation AtLoc, StringLiteral *S){
81 // Verify that this composite string is acceptable for ObjC strings.
82 if (CheckObjCString(S))
85 // Initialize the constant string interface lazily. This assumes
86 // the NSString interface is seen in this translation unit. Note: We
87 // don't use NSConstantString, since the runtime team considers this
88 // interface private (even though it appears in the header files).
89 QualType Ty = Context.getObjCConstantStringInterface();
91 Ty = Context.getObjCObjectPointerType(Ty);
92 } else if (getLangOpts().NoConstantCFStrings) {
93 IdentifierInfo *NSIdent=nullptr;
94 std::string StringClass(getLangOpts().ObjCConstantStringClass);
96 if (StringClass.empty())
97 NSIdent = &Context.Idents.get("NSConstantString");
99 NSIdent = &Context.Idents.get(StringClass);
101 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
103 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
104 Context.setObjCConstantStringInterface(StrIF);
105 Ty = Context.getObjCConstantStringInterface();
106 Ty = Context.getObjCObjectPointerType(Ty);
108 // If there is no NSConstantString interface defined then treat this
109 // as error and recover from it.
110 Diag(S->getLocStart(), diag::err_no_nsconstant_string_class) << NSIdent
111 << S->getSourceRange();
112 Ty = Context.getObjCIdType();
115 IdentifierInfo *NSIdent = NSAPIObj->getNSClassId(NSAPI::ClassId_NSString);
116 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
118 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
119 Context.setObjCConstantStringInterface(StrIF);
120 Ty = Context.getObjCConstantStringInterface();
121 Ty = Context.getObjCObjectPointerType(Ty);
123 // If there is no NSString interface defined, implicitly declare
124 // a @class NSString; and use that instead. This is to make sure
125 // type of an NSString literal is represented correctly, instead of
126 // being an 'id' type.
127 Ty = Context.getObjCNSStringType();
129 ObjCInterfaceDecl *NSStringIDecl =
130 ObjCInterfaceDecl::Create (Context,
131 Context.getTranslationUnitDecl(),
132 SourceLocation(), NSIdent,
133 nullptr, nullptr, SourceLocation());
134 Ty = Context.getObjCInterfaceType(NSStringIDecl);
135 Context.setObjCNSStringType(Ty);
137 Ty = Context.getObjCObjectPointerType(Ty);
141 return new (Context) ObjCStringLiteral(S, Ty, AtLoc);
144 /// \brief Emits an error if the given method does not exist, or if the return
145 /// type is not an Objective-C object.
146 static bool validateBoxingMethod(Sema &S, SourceLocation Loc,
147 const ObjCInterfaceDecl *Class,
148 Selector Sel, const ObjCMethodDecl *Method) {
150 // FIXME: Is there a better way to avoid quotes than using getName()?
151 S.Diag(Loc, diag::err_undeclared_boxing_method) << Sel << Class->getName();
155 // Make sure the return type is reasonable.
156 QualType ReturnType = Method->getReturnType();
157 if (!ReturnType->isObjCObjectPointerType()) {
158 S.Diag(Loc, diag::err_objc_literal_method_sig)
160 S.Diag(Method->getLocation(), diag::note_objc_literal_method_return)
168 /// \brief Maps ObjCLiteralKind to NSClassIdKindKind
169 static NSAPI::NSClassIdKindKind ClassKindFromLiteralKind(
170 Sema::ObjCLiteralKind LiteralKind) {
171 switch (LiteralKind) {
173 return NSAPI::ClassId_NSArray;
174 case Sema::LK_Dictionary:
175 return NSAPI::ClassId_NSDictionary;
176 case Sema::LK_Numeric:
177 return NSAPI::ClassId_NSNumber;
178 case Sema::LK_String:
179 return NSAPI::ClassId_NSString;
181 return NSAPI::ClassId_NSValue;
183 // there is no corresponding matching
184 // between LK_None/LK_Block and NSClassIdKindKind
189 llvm_unreachable("LiteralKind can't be converted into a ClassKind");
192 /// \brief Validates ObjCInterfaceDecl availability.
193 /// ObjCInterfaceDecl, used to create ObjC literals, should be defined
194 /// if clang not in a debugger mode.
195 static bool ValidateObjCLiteralInterfaceDecl(Sema &S, ObjCInterfaceDecl *Decl,
197 Sema::ObjCLiteralKind LiteralKind) {
199 NSAPI::NSClassIdKindKind Kind = ClassKindFromLiteralKind(LiteralKind);
200 IdentifierInfo *II = S.NSAPIObj->getNSClassId(Kind);
201 S.Diag(Loc, diag::err_undeclared_objc_literal_class)
202 << II->getName() << LiteralKind;
204 } else if (!Decl->hasDefinition() && !S.getLangOpts().DebuggerObjCLiteral) {
205 S.Diag(Loc, diag::err_undeclared_objc_literal_class)
206 << Decl->getName() << LiteralKind;
207 S.Diag(Decl->getLocation(), diag::note_forward_class);
214 /// \brief Looks up ObjCInterfaceDecl of a given NSClassIdKindKind.
215 /// Used to create ObjC literals, such as NSDictionary (@{}),
216 /// NSArray (@[]) and Boxed Expressions (@())
217 static ObjCInterfaceDecl *LookupObjCInterfaceDeclForLiteral(Sema &S,
219 Sema::ObjCLiteralKind LiteralKind) {
220 NSAPI::NSClassIdKindKind ClassKind = ClassKindFromLiteralKind(LiteralKind);
221 IdentifierInfo *II = S.NSAPIObj->getNSClassId(ClassKind);
222 NamedDecl *IF = S.LookupSingleName(S.TUScope, II, Loc,
223 Sema::LookupOrdinaryName);
224 ObjCInterfaceDecl *ID = dyn_cast_or_null<ObjCInterfaceDecl>(IF);
225 if (!ID && S.getLangOpts().DebuggerObjCLiteral) {
226 ASTContext &Context = S.Context;
227 TranslationUnitDecl *TU = Context.getTranslationUnitDecl();
228 ID = ObjCInterfaceDecl::Create (Context, TU, SourceLocation(), II,
229 nullptr, nullptr, SourceLocation());
232 if (!ValidateObjCLiteralInterfaceDecl(S, ID, Loc, LiteralKind)) {
239 /// \brief Retrieve the NSNumber factory method that should be used to create
240 /// an Objective-C literal for the given type.
241 static ObjCMethodDecl *getNSNumberFactoryMethod(Sema &S, SourceLocation Loc,
243 bool isLiteral = false,
244 SourceRange R = SourceRange()) {
245 Optional<NSAPI::NSNumberLiteralMethodKind> Kind =
246 S.NSAPIObj->getNSNumberFactoryMethodKind(NumberType);
250 S.Diag(Loc, diag::err_invalid_nsnumber_type)
256 // If we already looked up this method, we're done.
257 if (S.NSNumberLiteralMethods[*Kind])
258 return S.NSNumberLiteralMethods[*Kind];
260 Selector Sel = S.NSAPIObj->getNSNumberLiteralSelector(*Kind,
263 ASTContext &CX = S.Context;
265 // Look up the NSNumber class, if we haven't done so already. It's cached
266 // in the Sema instance.
267 if (!S.NSNumberDecl) {
268 S.NSNumberDecl = LookupObjCInterfaceDeclForLiteral(S, Loc,
270 if (!S.NSNumberDecl) {
275 if (S.NSNumberPointer.isNull()) {
276 // generate the pointer to NSNumber type.
277 QualType NSNumberObject = CX.getObjCInterfaceType(S.NSNumberDecl);
278 S.NSNumberPointer = CX.getObjCObjectPointerType(NSNumberObject);
281 // Look for the appropriate method within NSNumber.
282 ObjCMethodDecl *Method = S.NSNumberDecl->lookupClassMethod(Sel);
283 if (!Method && S.getLangOpts().DebuggerObjCLiteral) {
284 // create a stub definition this NSNumber factory method.
285 TypeSourceInfo *ReturnTInfo = nullptr;
287 ObjCMethodDecl::Create(CX, SourceLocation(), SourceLocation(), Sel,
288 S.NSNumberPointer, ReturnTInfo, S.NSNumberDecl,
289 /*isInstance=*/false, /*isVariadic=*/false,
290 /*isPropertyAccessor=*/false,
291 /*isImplicitlyDeclared=*/true,
292 /*isDefined=*/false, ObjCMethodDecl::Required,
293 /*HasRelatedResultType=*/false);
294 ParmVarDecl *value = ParmVarDecl::Create(S.Context, Method,
295 SourceLocation(), SourceLocation(),
296 &CX.Idents.get("value"),
297 NumberType, /*TInfo=*/nullptr,
299 Method->setMethodParams(S.Context, value, None);
302 if (!validateBoxingMethod(S, Loc, S.NSNumberDecl, Sel, Method))
305 // Note: if the parameter type is out-of-line, we'll catch it later in the
306 // implicit conversion.
308 S.NSNumberLiteralMethods[*Kind] = Method;
312 /// BuildObjCNumericLiteral - builds an ObjCBoxedExpr AST node for the
313 /// numeric literal expression. Type of the expression will be "NSNumber *".
314 ExprResult Sema::BuildObjCNumericLiteral(SourceLocation AtLoc, Expr *Number) {
315 // Determine the type of the literal.
316 QualType NumberType = Number->getType();
317 if (CharacterLiteral *Char = dyn_cast<CharacterLiteral>(Number)) {
318 // In C, character literals have type 'int'. That's not the type we want
319 // to use to determine the Objective-c literal kind.
320 switch (Char->getKind()) {
321 case CharacterLiteral::Ascii:
322 case CharacterLiteral::UTF8:
323 NumberType = Context.CharTy;
326 case CharacterLiteral::Wide:
327 NumberType = Context.getWideCharType();
330 case CharacterLiteral::UTF16:
331 NumberType = Context.Char16Ty;
334 case CharacterLiteral::UTF32:
335 NumberType = Context.Char32Ty;
340 // Look for the appropriate method within NSNumber.
341 // Construct the literal.
342 SourceRange NR(Number->getSourceRange());
343 ObjCMethodDecl *Method = getNSNumberFactoryMethod(*this, AtLoc, NumberType,
348 // Convert the number to the type that the parameter expects.
349 ParmVarDecl *ParamDecl = Method->parameters()[0];
350 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
352 ExprResult ConvertedNumber = PerformCopyInitialization(Entity,
355 if (ConvertedNumber.isInvalid())
357 Number = ConvertedNumber.get();
359 // Use the effective source range of the literal, including the leading '@'.
360 return MaybeBindToTemporary(
361 new (Context) ObjCBoxedExpr(Number, NSNumberPointer, Method,
362 SourceRange(AtLoc, NR.getEnd())));
365 ExprResult Sema::ActOnObjCBoolLiteral(SourceLocation AtLoc,
366 SourceLocation ValueLoc,
369 if (getLangOpts().CPlusPlus) {
370 Inner = ActOnCXXBoolLiteral(ValueLoc, Value? tok::kw_true : tok::kw_false);
372 // C doesn't actually have a way to represent literal values of type
373 // _Bool. So, we'll use 0/1 and implicit cast to _Bool.
374 Inner = ActOnIntegerConstant(ValueLoc, Value? 1 : 0);
375 Inner = ImpCastExprToType(Inner.get(), Context.BoolTy,
376 CK_IntegralToBoolean);
379 return BuildObjCNumericLiteral(AtLoc, Inner.get());
382 /// \brief Check that the given expression is a valid element of an Objective-C
383 /// collection literal.
384 static ExprResult CheckObjCCollectionLiteralElement(Sema &S, Expr *Element,
386 bool ArrayLiteral = false) {
387 // If the expression is type-dependent, there's nothing for us to do.
388 if (Element->isTypeDependent())
391 ExprResult Result = S.CheckPlaceholderExpr(Element);
392 if (Result.isInvalid())
394 Element = Result.get();
396 // In C++, check for an implicit conversion to an Objective-C object pointer
398 if (S.getLangOpts().CPlusPlus && Element->getType()->isRecordType()) {
399 InitializedEntity Entity
400 = InitializedEntity::InitializeParameter(S.Context, T,
402 InitializationKind Kind
403 = InitializationKind::CreateCopy(Element->getLocStart(),
405 InitializationSequence Seq(S, Entity, Kind, Element);
407 return Seq.Perform(S, Entity, Kind, Element);
410 Expr *OrigElement = Element;
412 // Perform lvalue-to-rvalue conversion.
413 Result = S.DefaultLvalueConversion(Element);
414 if (Result.isInvalid())
416 Element = Result.get();
418 // Make sure that we have an Objective-C pointer type or block.
419 if (!Element->getType()->isObjCObjectPointerType() &&
420 !Element->getType()->isBlockPointerType()) {
421 bool Recovered = false;
423 // If this is potentially an Objective-C numeric literal, add the '@'.
424 if (isa<IntegerLiteral>(OrigElement) ||
425 isa<CharacterLiteral>(OrigElement) ||
426 isa<FloatingLiteral>(OrigElement) ||
427 isa<ObjCBoolLiteralExpr>(OrigElement) ||
428 isa<CXXBoolLiteralExpr>(OrigElement)) {
429 if (S.NSAPIObj->getNSNumberFactoryMethodKind(OrigElement->getType())) {
430 int Which = isa<CharacterLiteral>(OrigElement) ? 1
431 : (isa<CXXBoolLiteralExpr>(OrigElement) ||
432 isa<ObjCBoolLiteralExpr>(OrigElement)) ? 2
435 S.Diag(OrigElement->getLocStart(), diag::err_box_literal_collection)
436 << Which << OrigElement->getSourceRange()
437 << FixItHint::CreateInsertion(OrigElement->getLocStart(), "@");
439 Result = S.BuildObjCNumericLiteral(OrigElement->getLocStart(),
441 if (Result.isInvalid())
444 Element = Result.get();
448 // If this is potentially an Objective-C string literal, add the '@'.
449 else if (StringLiteral *String = dyn_cast<StringLiteral>(OrigElement)) {
450 if (String->isAscii()) {
451 S.Diag(OrigElement->getLocStart(), diag::err_box_literal_collection)
452 << 0 << OrigElement->getSourceRange()
453 << FixItHint::CreateInsertion(OrigElement->getLocStart(), "@");
455 Result = S.BuildObjCStringLiteral(OrigElement->getLocStart(), String);
456 if (Result.isInvalid())
459 Element = Result.get();
465 S.Diag(Element->getLocStart(), diag::err_invalid_collection_element)
466 << Element->getType();
471 if (ObjCStringLiteral *getString =
472 dyn_cast<ObjCStringLiteral>(OrigElement)) {
473 if (StringLiteral *SL = getString->getString()) {
474 unsigned numConcat = SL->getNumConcatenated();
476 // Only warn if the concatenated string doesn't come from a macro.
477 bool hasMacro = false;
478 for (unsigned i = 0; i < numConcat ; ++i)
479 if (SL->getStrTokenLoc(i).isMacroID()) {
484 S.Diag(Element->getLocStart(),
485 diag::warn_concatenated_nsarray_literal)
486 << Element->getType();
491 // Make sure that the element has the type that the container factory
493 return S.PerformCopyInitialization(
494 InitializedEntity::InitializeParameter(S.Context, T,
496 Element->getLocStart(), Element);
499 ExprResult Sema::BuildObjCBoxedExpr(SourceRange SR, Expr *ValueExpr) {
500 if (ValueExpr->isTypeDependent()) {
501 ObjCBoxedExpr *BoxedExpr =
502 new (Context) ObjCBoxedExpr(ValueExpr, Context.DependentTy, nullptr, SR);
505 ObjCMethodDecl *BoxingMethod = nullptr;
507 // Convert the expression to an RValue, so we can check for pointer types...
508 ExprResult RValue = DefaultFunctionArrayLvalueConversion(ValueExpr);
509 if (RValue.isInvalid()) {
512 SourceLocation Loc = SR.getBegin();
513 ValueExpr = RValue.get();
514 QualType ValueType(ValueExpr->getType());
515 if (const PointerType *PT = ValueType->getAs<PointerType>()) {
516 QualType PointeeType = PT->getPointeeType();
517 if (Context.hasSameUnqualifiedType(PointeeType, Context.CharTy)) {
520 NSStringDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
525 QualType NSStringObject = Context.getObjCInterfaceType(NSStringDecl);
526 NSStringPointer = Context.getObjCObjectPointerType(NSStringObject);
529 if (!StringWithUTF8StringMethod) {
530 IdentifierInfo *II = &Context.Idents.get("stringWithUTF8String");
531 Selector stringWithUTF8String = Context.Selectors.getUnarySelector(II);
533 // Look for the appropriate method within NSString.
534 BoxingMethod = NSStringDecl->lookupClassMethod(stringWithUTF8String);
535 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
536 // Debugger needs to work even if NSString hasn't been defined.
537 TypeSourceInfo *ReturnTInfo = nullptr;
538 ObjCMethodDecl *M = ObjCMethodDecl::Create(
539 Context, SourceLocation(), SourceLocation(), stringWithUTF8String,
540 NSStringPointer, ReturnTInfo, NSStringDecl,
541 /*isInstance=*/false, /*isVariadic=*/false,
542 /*isPropertyAccessor=*/false,
543 /*isImplicitlyDeclared=*/true,
544 /*isDefined=*/false, ObjCMethodDecl::Required,
545 /*HasRelatedResultType=*/false);
546 QualType ConstCharType = Context.CharTy.withConst();
548 ParmVarDecl::Create(Context, M,
549 SourceLocation(), SourceLocation(),
550 &Context.Idents.get("value"),
551 Context.getPointerType(ConstCharType),
554 M->setMethodParams(Context, value, None);
558 if (!validateBoxingMethod(*this, Loc, NSStringDecl,
559 stringWithUTF8String, BoxingMethod))
562 StringWithUTF8StringMethod = BoxingMethod;
565 BoxingMethod = StringWithUTF8StringMethod;
566 BoxedType = NSStringPointer;
567 // Transfer the nullability from method's return type.
568 Optional<NullabilityKind> Nullability =
569 BoxingMethod->getReturnType()->getNullability(Context);
571 BoxedType = Context.getAttributedType(
572 AttributedType::getNullabilityAttrKind(*Nullability), BoxedType,
575 } else if (ValueType->isBuiltinType()) {
576 // The other types we support are numeric, char and BOOL/bool. We could also
577 // provide limited support for structure types, such as NSRange, NSRect, and
578 // NSSize. See NSValue (NSValueGeometryExtensions) in <Foundation/NSGeometry.h>
581 // Check for a top-level character literal.
582 if (const CharacterLiteral *Char =
583 dyn_cast<CharacterLiteral>(ValueExpr->IgnoreParens())) {
584 // In C, character literals have type 'int'. That's not the type we want
585 // to use to determine the Objective-c literal kind.
586 switch (Char->getKind()) {
587 case CharacterLiteral::Ascii:
588 case CharacterLiteral::UTF8:
589 ValueType = Context.CharTy;
592 case CharacterLiteral::Wide:
593 ValueType = Context.getWideCharType();
596 case CharacterLiteral::UTF16:
597 ValueType = Context.Char16Ty;
600 case CharacterLiteral::UTF32:
601 ValueType = Context.Char32Ty;
605 // FIXME: Do I need to do anything special with BoolTy expressions?
607 // Look for the appropriate method within NSNumber.
608 BoxingMethod = getNSNumberFactoryMethod(*this, Loc, ValueType);
609 BoxedType = NSNumberPointer;
610 } else if (const EnumType *ET = ValueType->getAs<EnumType>()) {
611 if (!ET->getDecl()->isComplete()) {
612 Diag(Loc, diag::err_objc_incomplete_boxed_expression_type)
613 << ValueType << ValueExpr->getSourceRange();
617 BoxingMethod = getNSNumberFactoryMethod(*this, Loc,
618 ET->getDecl()->getIntegerType());
619 BoxedType = NSNumberPointer;
620 } else if (ValueType->isObjCBoxableRecordType()) {
621 // Support for structure types, that marked as objc_boxable
622 // struct __attribute__((objc_boxable)) s { ... };
624 // Look up the NSValue class, if we haven't done so already. It's cached
625 // in the Sema instance.
627 NSValueDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
633 // generate the pointer to NSValue type.
634 QualType NSValueObject = Context.getObjCInterfaceType(NSValueDecl);
635 NSValuePointer = Context.getObjCObjectPointerType(NSValueObject);
638 if (!ValueWithBytesObjCTypeMethod) {
639 IdentifierInfo *II[] = {
640 &Context.Idents.get("valueWithBytes"),
641 &Context.Idents.get("objCType")
643 Selector ValueWithBytesObjCType = Context.Selectors.getSelector(2, II);
645 // Look for the appropriate method within NSValue.
646 BoxingMethod = NSValueDecl->lookupClassMethod(ValueWithBytesObjCType);
647 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
648 // Debugger needs to work even if NSValue hasn't been defined.
649 TypeSourceInfo *ReturnTInfo = nullptr;
650 ObjCMethodDecl *M = ObjCMethodDecl::Create(
654 ValueWithBytesObjCType,
658 /*isInstance=*/false,
659 /*isVariadic=*/false,
660 /*isPropertyAccessor=*/false,
661 /*isImplicitlyDeclared=*/true,
663 ObjCMethodDecl::Required,
664 /*HasRelatedResultType=*/false);
666 SmallVector<ParmVarDecl *, 2> Params;
669 ParmVarDecl::Create(Context, M,
670 SourceLocation(), SourceLocation(),
671 &Context.Idents.get("bytes"),
672 Context.VoidPtrTy.withConst(),
675 Params.push_back(bytes);
677 QualType ConstCharType = Context.CharTy.withConst();
679 ParmVarDecl::Create(Context, M,
680 SourceLocation(), SourceLocation(),
681 &Context.Idents.get("type"),
682 Context.getPointerType(ConstCharType),
685 Params.push_back(type);
687 M->setMethodParams(Context, Params, None);
691 if (!validateBoxingMethod(*this, Loc, NSValueDecl,
692 ValueWithBytesObjCType, BoxingMethod))
695 ValueWithBytesObjCTypeMethod = BoxingMethod;
698 if (!ValueType.isTriviallyCopyableType(Context)) {
699 Diag(Loc, diag::err_objc_non_trivially_copyable_boxed_expression_type)
700 << ValueType << ValueExpr->getSourceRange();
704 BoxingMethod = ValueWithBytesObjCTypeMethod;
705 BoxedType = NSValuePointer;
709 Diag(Loc, diag::err_objc_illegal_boxed_expression_type)
710 << ValueType << ValueExpr->getSourceRange();
714 DiagnoseUseOfDecl(BoxingMethod, Loc);
716 ExprResult ConvertedValueExpr;
717 if (ValueType->isObjCBoxableRecordType()) {
718 InitializedEntity IE = InitializedEntity::InitializeTemporary(ValueType);
719 ConvertedValueExpr = PerformCopyInitialization(IE, ValueExpr->getExprLoc(),
722 // Convert the expression to the type that the parameter requires.
723 ParmVarDecl *ParamDecl = BoxingMethod->parameters()[0];
724 InitializedEntity IE = InitializedEntity::InitializeParameter(Context,
726 ConvertedValueExpr = PerformCopyInitialization(IE, SourceLocation(),
730 if (ConvertedValueExpr.isInvalid())
732 ValueExpr = ConvertedValueExpr.get();
734 ObjCBoxedExpr *BoxedExpr =
735 new (Context) ObjCBoxedExpr(ValueExpr, BoxedType,
737 return MaybeBindToTemporary(BoxedExpr);
740 /// Build an ObjC subscript pseudo-object expression, given that
741 /// that's supported by the runtime.
742 ExprResult Sema::BuildObjCSubscriptExpression(SourceLocation RB, Expr *BaseExpr,
744 ObjCMethodDecl *getterMethod,
745 ObjCMethodDecl *setterMethod) {
746 assert(!LangOpts.isSubscriptPointerArithmetic());
748 // We can't get dependent types here; our callers should have
749 // filtered them out.
750 assert((!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) &&
751 "base or index cannot have dependent type here");
753 // Filter out placeholders in the index. In theory, overloads could
754 // be preserved here, although that might not actually work correctly.
755 ExprResult Result = CheckPlaceholderExpr(IndexExpr);
756 if (Result.isInvalid())
758 IndexExpr = Result.get();
760 // Perform lvalue-to-rvalue conversion on the base.
761 Result = DefaultLvalueConversion(BaseExpr);
762 if (Result.isInvalid())
764 BaseExpr = Result.get();
766 // Build the pseudo-object expression.
767 return new (Context) ObjCSubscriptRefExpr(
768 BaseExpr, IndexExpr, Context.PseudoObjectTy, VK_LValue, OK_ObjCSubscript,
769 getterMethod, setterMethod, RB);
772 ExprResult Sema::BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements) {
773 SourceLocation Loc = SR.getBegin();
776 NSArrayDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
783 // Find the arrayWithObjects:count: method, if we haven't done so already.
784 QualType IdT = Context.getObjCIdType();
785 if (!ArrayWithObjectsMethod) {
787 Sel = NSAPIObj->getNSArraySelector(NSAPI::NSArr_arrayWithObjectsCount);
788 ObjCMethodDecl *Method = NSArrayDecl->lookupClassMethod(Sel);
789 if (!Method && getLangOpts().DebuggerObjCLiteral) {
790 TypeSourceInfo *ReturnTInfo = nullptr;
791 Method = ObjCMethodDecl::Create(
792 Context, SourceLocation(), SourceLocation(), Sel, IdT, ReturnTInfo,
793 Context.getTranslationUnitDecl(), false /*Instance*/,
794 false /*isVariadic*/,
795 /*isPropertyAccessor=*/false,
796 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
797 ObjCMethodDecl::Required, false);
798 SmallVector<ParmVarDecl *, 2> Params;
799 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
802 &Context.Idents.get("objects"),
803 Context.getPointerType(IdT),
806 Params.push_back(objects);
807 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
810 &Context.Idents.get("cnt"),
811 Context.UnsignedLongTy,
812 /*TInfo=*/nullptr, SC_None,
814 Params.push_back(cnt);
815 Method->setMethodParams(Context, Params, None);
818 if (!validateBoxingMethod(*this, Loc, NSArrayDecl, Sel, Method))
821 // Dig out the type that all elements should be converted to.
822 QualType T = Method->parameters()[0]->getType();
823 const PointerType *PtrT = T->getAs<PointerType>();
825 !Context.hasSameUnqualifiedType(PtrT->getPointeeType(), IdT)) {
826 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
828 Diag(Method->parameters()[0]->getLocation(),
829 diag::note_objc_literal_method_param)
831 << Context.getPointerType(IdT.withConst());
835 // Check that the 'count' parameter is integral.
836 if (!Method->parameters()[1]->getType()->isIntegerType()) {
837 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
839 Diag(Method->parameters()[1]->getLocation(),
840 diag::note_objc_literal_method_param)
842 << Method->parameters()[1]->getType()
847 // We've found a good +arrayWithObjects:count: method. Save it!
848 ArrayWithObjectsMethod = Method;
851 QualType ObjectsType = ArrayWithObjectsMethod->parameters()[0]->getType();
852 QualType RequiredType = ObjectsType->castAs<PointerType>()->getPointeeType();
854 // Check that each of the elements provided is valid in a collection literal,
855 // performing conversions as necessary.
856 Expr **ElementsBuffer = Elements.data();
857 for (unsigned I = 0, N = Elements.size(); I != N; ++I) {
858 ExprResult Converted = CheckObjCCollectionLiteralElement(*this,
861 if (Converted.isInvalid())
864 ElementsBuffer[I] = Converted.get();
868 = Context.getObjCObjectPointerType(
869 Context.getObjCInterfaceType(NSArrayDecl));
871 return MaybeBindToTemporary(
872 ObjCArrayLiteral::Create(Context, Elements, Ty,
873 ArrayWithObjectsMethod, SR));
876 ExprResult Sema::BuildObjCDictionaryLiteral(SourceRange SR,
877 MutableArrayRef<ObjCDictionaryElement> Elements) {
878 SourceLocation Loc = SR.getBegin();
880 if (!NSDictionaryDecl) {
881 NSDictionaryDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
882 Sema::LK_Dictionary);
883 if (!NSDictionaryDecl) {
888 // Find the dictionaryWithObjects:forKeys:count: method, if we haven't done
890 QualType IdT = Context.getObjCIdType();
891 if (!DictionaryWithObjectsMethod) {
892 Selector Sel = NSAPIObj->getNSDictionarySelector(
893 NSAPI::NSDict_dictionaryWithObjectsForKeysCount);
894 ObjCMethodDecl *Method = NSDictionaryDecl->lookupClassMethod(Sel);
895 if (!Method && getLangOpts().DebuggerObjCLiteral) {
896 Method = ObjCMethodDecl::Create(Context,
897 SourceLocation(), SourceLocation(), Sel,
899 nullptr /*TypeSourceInfo */,
900 Context.getTranslationUnitDecl(),
901 false /*Instance*/, false/*isVariadic*/,
902 /*isPropertyAccessor=*/false,
903 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
904 ObjCMethodDecl::Required,
906 SmallVector<ParmVarDecl *, 3> Params;
907 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
910 &Context.Idents.get("objects"),
911 Context.getPointerType(IdT),
912 /*TInfo=*/nullptr, SC_None,
914 Params.push_back(objects);
915 ParmVarDecl *keys = ParmVarDecl::Create(Context, Method,
918 &Context.Idents.get("keys"),
919 Context.getPointerType(IdT),
920 /*TInfo=*/nullptr, SC_None,
922 Params.push_back(keys);
923 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
926 &Context.Idents.get("cnt"),
927 Context.UnsignedLongTy,
928 /*TInfo=*/nullptr, SC_None,
930 Params.push_back(cnt);
931 Method->setMethodParams(Context, Params, None);
934 if (!validateBoxingMethod(*this, SR.getBegin(), NSDictionaryDecl, Sel,
938 // Dig out the type that all values should be converted to.
939 QualType ValueT = Method->parameters()[0]->getType();
940 const PointerType *PtrValue = ValueT->getAs<PointerType>();
942 !Context.hasSameUnqualifiedType(PtrValue->getPointeeType(), IdT)) {
943 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
945 Diag(Method->parameters()[0]->getLocation(),
946 diag::note_objc_literal_method_param)
948 << Context.getPointerType(IdT.withConst());
952 // Dig out the type that all keys should be converted to.
953 QualType KeyT = Method->parameters()[1]->getType();
954 const PointerType *PtrKey = KeyT->getAs<PointerType>();
956 !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
960 if (QIDNSCopying.isNull()) {
961 // key argument of selector is id<NSCopying>?
962 if (ObjCProtocolDecl *NSCopyingPDecl =
963 LookupProtocol(&Context.Idents.get("NSCopying"), SR.getBegin())) {
964 ObjCProtocolDecl *PQ[] = {NSCopyingPDecl};
966 Context.getObjCObjectType(Context.ObjCBuiltinIdTy, { },
968 (ObjCProtocolDecl**) PQ,
971 QIDNSCopying = Context.getObjCObjectPointerType(QIDNSCopying);
974 if (!QIDNSCopying.isNull())
975 err = !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
980 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
982 Diag(Method->parameters()[1]->getLocation(),
983 diag::note_objc_literal_method_param)
985 << Context.getPointerType(IdT.withConst());
990 // Check that the 'count' parameter is integral.
991 QualType CountType = Method->parameters()[2]->getType();
992 if (!CountType->isIntegerType()) {
993 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
995 Diag(Method->parameters()[2]->getLocation(),
996 diag::note_objc_literal_method_param)
1002 // We've found a good +dictionaryWithObjects:keys:count: method; save it!
1003 DictionaryWithObjectsMethod = Method;
1006 QualType ValuesT = DictionaryWithObjectsMethod->parameters()[0]->getType();
1007 QualType ValueT = ValuesT->castAs<PointerType>()->getPointeeType();
1008 QualType KeysT = DictionaryWithObjectsMethod->parameters()[1]->getType();
1009 QualType KeyT = KeysT->castAs<PointerType>()->getPointeeType();
1011 // Check that each of the keys and values provided is valid in a collection
1012 // literal, performing conversions as necessary.
1013 bool HasPackExpansions = false;
1014 for (ObjCDictionaryElement &Element : Elements) {
1016 ExprResult Key = CheckObjCCollectionLiteralElement(*this, Element.Key,
1018 if (Key.isInvalid())
1023 = CheckObjCCollectionLiteralElement(*this, Element.Value, ValueT);
1024 if (Value.isInvalid())
1027 Element.Key = Key.get();
1028 Element.Value = Value.get();
1030 if (Element.EllipsisLoc.isInvalid())
1033 if (!Element.Key->containsUnexpandedParameterPack() &&
1034 !Element.Value->containsUnexpandedParameterPack()) {
1035 Diag(Element.EllipsisLoc,
1036 diag::err_pack_expansion_without_parameter_packs)
1037 << SourceRange(Element.Key->getLocStart(),
1038 Element.Value->getLocEnd());
1042 HasPackExpansions = true;
1046 = Context.getObjCObjectPointerType(
1047 Context.getObjCInterfaceType(NSDictionaryDecl));
1048 return MaybeBindToTemporary(ObjCDictionaryLiteral::Create(
1049 Context, Elements, HasPackExpansions, Ty,
1050 DictionaryWithObjectsMethod, SR));
1053 ExprResult Sema::BuildObjCEncodeExpression(SourceLocation AtLoc,
1054 TypeSourceInfo *EncodedTypeInfo,
1055 SourceLocation RParenLoc) {
1056 QualType EncodedType = EncodedTypeInfo->getType();
1058 if (EncodedType->isDependentType())
1059 StrTy = Context.DependentTy;
1061 if (!EncodedType->getAsArrayTypeUnsafe() && //// Incomplete array is handled.
1062 !EncodedType->isVoidType()) // void is handled too.
1063 if (RequireCompleteType(AtLoc, EncodedType,
1064 diag::err_incomplete_type_objc_at_encode,
1065 EncodedTypeInfo->getTypeLoc()))
1069 QualType NotEncodedT;
1070 Context.getObjCEncodingForType(EncodedType, Str, nullptr, &NotEncodedT);
1071 if (!NotEncodedT.isNull())
1072 Diag(AtLoc, diag::warn_incomplete_encoded_type)
1073 << EncodedType << NotEncodedT;
1075 // The type of @encode is the same as the type of the corresponding string,
1076 // which is an array type.
1077 StrTy = Context.CharTy;
1078 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
1079 if (getLangOpts().CPlusPlus || getLangOpts().ConstStrings)
1081 StrTy = Context.getConstantArrayType(StrTy, llvm::APInt(32, Str.size()+1),
1082 ArrayType::Normal, 0);
1085 return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc);
1088 ExprResult Sema::ParseObjCEncodeExpression(SourceLocation AtLoc,
1089 SourceLocation EncodeLoc,
1090 SourceLocation LParenLoc,
1092 SourceLocation RParenLoc) {
1093 // FIXME: Preserve type source info ?
1094 TypeSourceInfo *TInfo;
1095 QualType EncodedType = GetTypeFromParser(ty, &TInfo);
1097 TInfo = Context.getTrivialTypeSourceInfo(EncodedType,
1098 getLocForEndOfToken(LParenLoc));
1100 return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc);
1103 static bool HelperToDiagnoseMismatchedMethodsInGlobalPool(Sema &S,
1104 SourceLocation AtLoc,
1105 SourceLocation LParenLoc,
1106 SourceLocation RParenLoc,
1107 ObjCMethodDecl *Method,
1108 ObjCMethodList &MethList) {
1109 ObjCMethodList *M = &MethList;
1110 bool Warned = false;
1111 for (M = M->getNext(); M; M=M->getNext()) {
1112 ObjCMethodDecl *MatchingMethodDecl = M->getMethod();
1113 if (MatchingMethodDecl == Method ||
1114 isa<ObjCImplDecl>(MatchingMethodDecl->getDeclContext()) ||
1115 MatchingMethodDecl->getSelector() != Method->getSelector())
1117 if (!S.MatchTwoMethodDeclarations(Method,
1118 MatchingMethodDecl, Sema::MMS_loose)) {
1121 S.Diag(AtLoc, diag::warn_multiple_selectors)
1122 << Method->getSelector() << FixItHint::CreateInsertion(LParenLoc, "(")
1123 << FixItHint::CreateInsertion(RParenLoc, ")");
1124 S.Diag(Method->getLocation(), diag::note_method_declared_at)
1125 << Method->getDeclName();
1127 S.Diag(MatchingMethodDecl->getLocation(), diag::note_method_declared_at)
1128 << MatchingMethodDecl->getDeclName();
1134 static void DiagnoseMismatchedSelectors(Sema &S, SourceLocation AtLoc,
1135 ObjCMethodDecl *Method,
1136 SourceLocation LParenLoc,
1137 SourceLocation RParenLoc,
1138 bool WarnMultipleSelectors) {
1139 if (!WarnMultipleSelectors ||
1140 S.Diags.isIgnored(diag::warn_multiple_selectors, SourceLocation()))
1142 bool Warned = false;
1143 for (Sema::GlobalMethodPool::iterator b = S.MethodPool.begin(),
1144 e = S.MethodPool.end(); b != e; b++) {
1145 // first, instance methods
1146 ObjCMethodList &InstMethList = b->second.first;
1147 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1148 Method, InstMethList))
1151 // second, class methods
1152 ObjCMethodList &ClsMethList = b->second.second;
1153 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1154 Method, ClsMethList) || Warned)
1159 ExprResult Sema::ParseObjCSelectorExpression(Selector Sel,
1160 SourceLocation AtLoc,
1161 SourceLocation SelLoc,
1162 SourceLocation LParenLoc,
1163 SourceLocation RParenLoc,
1164 bool WarnMultipleSelectors) {
1165 ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel,
1166 SourceRange(LParenLoc, RParenLoc));
1168 Method = LookupFactoryMethodInGlobalPool(Sel,
1169 SourceRange(LParenLoc, RParenLoc));
1171 if (const ObjCMethodDecl *OM = SelectorsForTypoCorrection(Sel)) {
1172 Selector MatchedSel = OM->getSelector();
1173 SourceRange SelectorRange(LParenLoc.getLocWithOffset(1),
1174 RParenLoc.getLocWithOffset(-1));
1175 Diag(SelLoc, diag::warn_undeclared_selector_with_typo)
1176 << Sel << MatchedSel
1177 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1180 Diag(SelLoc, diag::warn_undeclared_selector) << Sel;
1182 DiagnoseMismatchedSelectors(*this, AtLoc, Method, LParenLoc, RParenLoc,
1183 WarnMultipleSelectors);
1186 Method->getImplementationControl() != ObjCMethodDecl::Optional &&
1187 !getSourceManager().isInSystemHeader(Method->getLocation()))
1188 ReferencedSelectors.insert(std::make_pair(Sel, AtLoc));
1190 // In ARC, forbid the user from using @selector for
1191 // retain/release/autorelease/dealloc/retainCount.
1192 if (getLangOpts().ObjCAutoRefCount) {
1193 switch (Sel.getMethodFamily()) {
1196 case OMF_autorelease:
1197 case OMF_retainCount:
1199 Diag(AtLoc, diag::err_arc_illegal_selector) <<
1200 Sel << SourceRange(LParenLoc, RParenLoc);
1208 case OMF_mutableCopy:
1211 case OMF_initialize:
1212 case OMF_performSelector:
1216 QualType Ty = Context.getObjCSelType();
1217 return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc);
1220 ExprResult Sema::ParseObjCProtocolExpression(IdentifierInfo *ProtocolId,
1221 SourceLocation AtLoc,
1222 SourceLocation ProtoLoc,
1223 SourceLocation LParenLoc,
1224 SourceLocation ProtoIdLoc,
1225 SourceLocation RParenLoc) {
1226 ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoIdLoc);
1228 Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId;
1231 if (PDecl->hasDefinition())
1232 PDecl = PDecl->getDefinition();
1234 QualType Ty = Context.getObjCProtoType();
1237 Ty = Context.getObjCObjectPointerType(Ty);
1238 return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, ProtoIdLoc, RParenLoc);
1241 /// Try to capture an implicit reference to 'self'.
1242 ObjCMethodDecl *Sema::tryCaptureObjCSelf(SourceLocation Loc) {
1243 DeclContext *DC = getFunctionLevelDeclContext();
1245 // If we're not in an ObjC method, error out. Note that, unlike the
1246 // C++ case, we don't require an instance method --- class methods
1247 // still have a 'self', and we really do still need to capture it!
1248 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(DC);
1252 tryCaptureVariable(method->getSelfDecl(), Loc);
1257 static QualType stripObjCInstanceType(ASTContext &Context, QualType T) {
1258 QualType origType = T;
1259 if (auto nullability = AttributedType::stripOuterNullability(T)) {
1260 if (T == Context.getObjCInstanceType()) {
1261 return Context.getAttributedType(
1262 AttributedType::getNullabilityAttrKind(*nullability),
1263 Context.getObjCIdType(),
1264 Context.getObjCIdType());
1270 if (T == Context.getObjCInstanceType())
1271 return Context.getObjCIdType();
1276 /// Determine the result type of a message send based on the receiver type,
1277 /// method, and the kind of message send.
1279 /// This is the "base" result type, which will still need to be adjusted
1280 /// to account for nullability.
1281 static QualType getBaseMessageSendResultType(Sema &S,
1282 QualType ReceiverType,
1283 ObjCMethodDecl *Method,
1284 bool isClassMessage,
1285 bool isSuperMessage) {
1286 assert(Method && "Must have a method");
1287 if (!Method->hasRelatedResultType())
1288 return Method->getSendResultType(ReceiverType);
1290 ASTContext &Context = S.Context;
1292 // Local function that transfers the nullability of the method's
1293 // result type to the returned result.
1294 auto transferNullability = [&](QualType type) -> QualType {
1295 // If the method's result type has nullability, extract it.
1296 if (auto nullability = Method->getSendResultType(ReceiverType)
1297 ->getNullability(Context)){
1298 // Strip off any outer nullability sugar from the provided type.
1299 (void)AttributedType::stripOuterNullability(type);
1301 // Form a new attributed type using the method result type's nullability.
1302 return Context.getAttributedType(
1303 AttributedType::getNullabilityAttrKind(*nullability),
1311 // If a method has a related return type:
1312 // - if the method found is an instance method, but the message send
1313 // was a class message send, T is the declared return type of the method
1315 if (Method->isInstanceMethod() && isClassMessage)
1316 return stripObjCInstanceType(Context,
1317 Method->getSendResultType(ReceiverType));
1319 // - if the receiver is super, T is a pointer to the class of the
1320 // enclosing method definition
1321 if (isSuperMessage) {
1322 if (ObjCMethodDecl *CurMethod = S.getCurMethodDecl())
1323 if (ObjCInterfaceDecl *Class = CurMethod->getClassInterface()) {
1324 return transferNullability(
1325 Context.getObjCObjectPointerType(
1326 Context.getObjCInterfaceType(Class)));
1330 // - if the receiver is the name of a class U, T is a pointer to U
1331 if (ReceiverType->getAsObjCInterfaceType())
1332 return transferNullability(Context.getObjCObjectPointerType(ReceiverType));
1333 // - if the receiver is of type Class or qualified Class type,
1334 // T is the declared return type of the method.
1335 if (ReceiverType->isObjCClassType() ||
1336 ReceiverType->isObjCQualifiedClassType())
1337 return stripObjCInstanceType(Context,
1338 Method->getSendResultType(ReceiverType));
1340 // - if the receiver is id, qualified id, Class, or qualified Class, T
1341 // is the receiver type, otherwise
1342 // - T is the type of the receiver expression.
1343 return transferNullability(ReceiverType);
1346 QualType Sema::getMessageSendResultType(QualType ReceiverType,
1347 ObjCMethodDecl *Method,
1348 bool isClassMessage,
1349 bool isSuperMessage) {
1350 // Produce the result type.
1351 QualType resultType = getBaseMessageSendResultType(*this, ReceiverType,
1356 // If this is a class message, ignore the nullability of the receiver.
1360 // Map the nullability of the result into a table index.
1361 unsigned receiverNullabilityIdx = 0;
1362 if (auto nullability = ReceiverType->getNullability(Context))
1363 receiverNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1365 unsigned resultNullabilityIdx = 0;
1366 if (auto nullability = resultType->getNullability(Context))
1367 resultNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1369 // The table of nullability mappings, indexed by the receiver's nullability
1370 // and then the result type's nullability.
1371 static const uint8_t None = 0;
1372 static const uint8_t NonNull = 1;
1373 static const uint8_t Nullable = 2;
1374 static const uint8_t Unspecified = 3;
1375 static const uint8_t nullabilityMap[4][4] = {
1376 // None NonNull Nullable Unspecified
1377 /* None */ { None, None, Nullable, None },
1378 /* NonNull */ { None, NonNull, Nullable, Unspecified },
1379 /* Nullable */ { Nullable, Nullable, Nullable, Nullable },
1380 /* Unspecified */ { None, Unspecified, Nullable, Unspecified }
1383 unsigned newResultNullabilityIdx
1384 = nullabilityMap[receiverNullabilityIdx][resultNullabilityIdx];
1385 if (newResultNullabilityIdx == resultNullabilityIdx)
1388 // Strip off the existing nullability. This removes as little type sugar as
1391 if (auto attributed = dyn_cast<AttributedType>(resultType.getTypePtr())) {
1392 resultType = attributed->getModifiedType();
1394 resultType = resultType.getDesugaredType(Context);
1396 } while (resultType->getNullability(Context));
1398 // Add nullability back if needed.
1399 if (newResultNullabilityIdx > 0) {
1401 = static_cast<NullabilityKind>(newResultNullabilityIdx-1);
1402 return Context.getAttributedType(
1403 AttributedType::getNullabilityAttrKind(newNullability),
1404 resultType, resultType);
1410 /// Look for an ObjC method whose result type exactly matches the given type.
1411 static const ObjCMethodDecl *
1412 findExplicitInstancetypeDeclarer(const ObjCMethodDecl *MD,
1413 QualType instancetype) {
1414 if (MD->getReturnType() == instancetype)
1417 // For these purposes, a method in an @implementation overrides a
1418 // declaration in the @interface.
1419 if (const ObjCImplDecl *impl =
1420 dyn_cast<ObjCImplDecl>(MD->getDeclContext())) {
1421 const ObjCContainerDecl *iface;
1422 if (const ObjCCategoryImplDecl *catImpl =
1423 dyn_cast<ObjCCategoryImplDecl>(impl)) {
1424 iface = catImpl->getCategoryDecl();
1426 iface = impl->getClassInterface();
1429 const ObjCMethodDecl *ifaceMD =
1430 iface->getMethod(MD->getSelector(), MD->isInstanceMethod());
1431 if (ifaceMD) return findExplicitInstancetypeDeclarer(ifaceMD, instancetype);
1434 SmallVector<const ObjCMethodDecl *, 4> overrides;
1435 MD->getOverriddenMethods(overrides);
1436 for (unsigned i = 0, e = overrides.size(); i != e; ++i) {
1437 if (const ObjCMethodDecl *result =
1438 findExplicitInstancetypeDeclarer(overrides[i], instancetype))
1445 void Sema::EmitRelatedResultTypeNoteForReturn(QualType destType) {
1446 // Only complain if we're in an ObjC method and the required return
1447 // type doesn't match the method's declared return type.
1448 ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurContext);
1449 if (!MD || !MD->hasRelatedResultType() ||
1450 Context.hasSameUnqualifiedType(destType, MD->getReturnType()))
1453 // Look for a method overridden by this method which explicitly uses
1455 if (const ObjCMethodDecl *overridden =
1456 findExplicitInstancetypeDeclarer(MD, Context.getObjCInstanceType())) {
1457 SourceRange range = overridden->getReturnTypeSourceRange();
1458 SourceLocation loc = range.getBegin();
1459 if (loc.isInvalid())
1460 loc = overridden->getLocation();
1461 Diag(loc, diag::note_related_result_type_explicit)
1462 << /*current method*/ 1 << range;
1466 // Otherwise, if we have an interesting method family, note that.
1467 // This should always trigger if the above didn't.
1468 if (ObjCMethodFamily family = MD->getMethodFamily())
1469 Diag(MD->getLocation(), diag::note_related_result_type_family)
1470 << /*current method*/ 1
1474 void Sema::EmitRelatedResultTypeNote(const Expr *E) {
1475 E = E->IgnoreParenImpCasts();
1476 const ObjCMessageExpr *MsgSend = dyn_cast<ObjCMessageExpr>(E);
1480 const ObjCMethodDecl *Method = MsgSend->getMethodDecl();
1484 if (!Method->hasRelatedResultType())
1487 if (Context.hasSameUnqualifiedType(
1488 Method->getReturnType().getNonReferenceType(), MsgSend->getType()))
1491 if (!Context.hasSameUnqualifiedType(Method->getReturnType(),
1492 Context.getObjCInstanceType()))
1495 Diag(Method->getLocation(), diag::note_related_result_type_inferred)
1496 << Method->isInstanceMethod() << Method->getSelector()
1497 << MsgSend->getType();
1500 bool Sema::CheckMessageArgumentTypes(QualType ReceiverType,
1503 ArrayRef<SourceLocation> SelectorLocs,
1504 ObjCMethodDecl *Method,
1505 bool isClassMessage, bool isSuperMessage,
1506 SourceLocation lbrac, SourceLocation rbrac,
1507 SourceRange RecRange,
1508 QualType &ReturnType, ExprValueKind &VK) {
1509 SourceLocation SelLoc;
1510 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
1511 SelLoc = SelectorLocs.front();
1516 // Apply default argument promotion as for (C99 6.5.2.2p6).
1517 for (unsigned i = 0, e = Args.size(); i != e; i++) {
1518 if (Args[i]->isTypeDependent())
1522 if (getLangOpts().DebuggerSupport) {
1523 QualType paramTy; // ignored
1524 result = checkUnknownAnyArg(SelLoc, Args[i], paramTy);
1526 result = DefaultArgumentPromotion(Args[i]);
1528 if (result.isInvalid())
1530 Args[i] = result.get();
1534 if (getLangOpts().ObjCAutoRefCount)
1535 DiagID = diag::err_arc_method_not_found;
1537 DiagID = isClassMessage ? diag::warn_class_method_not_found
1538 : diag::warn_inst_method_not_found;
1539 if (!getLangOpts().DebuggerSupport) {
1540 const ObjCMethodDecl *OMD = SelectorsForTypoCorrection(Sel, ReceiverType);
1541 if (OMD && !OMD->isInvalidDecl()) {
1542 if (getLangOpts().ObjCAutoRefCount)
1543 DiagID = diag::err_method_not_found_with_typo;
1545 DiagID = isClassMessage ? diag::warn_class_method_not_found_with_typo
1546 : diag::warn_instance_method_not_found_with_typo;
1547 Selector MatchedSel = OMD->getSelector();
1548 SourceRange SelectorRange(SelectorLocs.front(), SelectorLocs.back());
1549 if (MatchedSel.isUnarySelector())
1550 Diag(SelLoc, DiagID)
1551 << Sel<< isClassMessage << MatchedSel
1552 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1554 Diag(SelLoc, DiagID) << Sel<< isClassMessage << MatchedSel;
1557 Diag(SelLoc, DiagID)
1558 << Sel << isClassMessage << SourceRange(SelectorLocs.front(),
1559 SelectorLocs.back());
1560 // Find the class to which we are sending this message.
1561 if (ReceiverType->isObjCObjectPointerType()) {
1562 if (ObjCInterfaceDecl *ThisClass =
1563 ReceiverType->getAs<ObjCObjectPointerType>()->getInterfaceDecl()) {
1564 Diag(ThisClass->getLocation(), diag::note_receiver_class_declared);
1565 if (!RecRange.isInvalid())
1566 if (ThisClass->lookupClassMethod(Sel))
1567 Diag(RecRange.getBegin(),diag::note_receiver_expr_here)
1568 << FixItHint::CreateReplacement(RecRange,
1569 ThisClass->getNameAsString());
1574 // In debuggers, we want to use __unknown_anytype for these
1575 // results so that clients can cast them.
1576 if (getLangOpts().DebuggerSupport) {
1577 ReturnType = Context.UnknownAnyTy;
1579 ReturnType = Context.getObjCIdType();
1585 ReturnType = getMessageSendResultType(ReceiverType, Method, isClassMessage,
1587 VK = Expr::getValueKindForType(Method->getReturnType());
1589 unsigned NumNamedArgs = Sel.getNumArgs();
1590 // Method might have more arguments than selector indicates. This is due
1591 // to addition of c-style arguments in method.
1592 if (Method->param_size() > Sel.getNumArgs())
1593 NumNamedArgs = Method->param_size();
1594 // FIXME. This need be cleaned up.
1595 if (Args.size() < NumNamedArgs) {
1596 Diag(SelLoc, diag::err_typecheck_call_too_few_args)
1597 << 2 << NumNamedArgs << static_cast<unsigned>(Args.size());
1601 // Compute the set of type arguments to be substituted into each parameter
1603 Optional<ArrayRef<QualType>> typeArgs
1604 = ReceiverType->getObjCSubstitutions(Method->getDeclContext());
1605 bool IsError = false;
1606 for (unsigned i = 0; i < NumNamedArgs; i++) {
1607 // We can't do any type-checking on a type-dependent argument.
1608 if (Args[i]->isTypeDependent())
1611 Expr *argExpr = Args[i];
1613 ParmVarDecl *param = Method->parameters()[i];
1614 assert(argExpr && "CheckMessageArgumentTypes(): missing expression");
1616 // Strip the unbridged-cast placeholder expression off unless it's
1617 // a consumed argument.
1618 if (argExpr->hasPlaceholderType(BuiltinType::ARCUnbridgedCast) &&
1619 !param->hasAttr<CFConsumedAttr>())
1620 argExpr = stripARCUnbridgedCast(argExpr);
1622 // If the parameter is __unknown_anytype, infer its type
1623 // from the argument.
1624 if (param->getType() == Context.UnknownAnyTy) {
1626 ExprResult argE = checkUnknownAnyArg(SelLoc, argExpr, paramType);
1627 if (argE.isInvalid()) {
1630 Args[i] = argE.get();
1632 // Update the parameter type in-place.
1633 param->setType(paramType);
1638 QualType origParamType = param->getType();
1639 QualType paramType = param->getType();
1641 paramType = paramType.substObjCTypeArgs(
1644 ObjCSubstitutionContext::Parameter);
1646 if (RequireCompleteType(argExpr->getSourceRange().getBegin(),
1648 diag::err_call_incomplete_argument, argExpr))
1651 InitializedEntity Entity
1652 = InitializedEntity::InitializeParameter(Context, param, paramType);
1653 ExprResult ArgE = PerformCopyInitialization(Entity, SourceLocation(), argExpr);
1654 if (ArgE.isInvalid())
1657 Args[i] = ArgE.getAs<Expr>();
1659 // If we are type-erasing a block to a block-compatible
1660 // Objective-C pointer type, we may need to extend the lifetime
1661 // of the block object.
1662 if (typeArgs && Args[i]->isRValue() && paramType->isBlockPointerType() &&
1663 Args[i]->getType()->isBlockPointerType() &&
1664 origParamType->isObjCObjectPointerType()) {
1665 ExprResult arg = Args[i];
1666 maybeExtendBlockObject(arg);
1667 Args[i] = arg.get();
1672 // Promote additional arguments to variadic methods.
1673 if (Method->isVariadic()) {
1674 for (unsigned i = NumNamedArgs, e = Args.size(); i < e; ++i) {
1675 if (Args[i]->isTypeDependent())
1678 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod,
1680 IsError |= Arg.isInvalid();
1681 Args[i] = Arg.get();
1684 // Check for extra arguments to non-variadic methods.
1685 if (Args.size() != NumNamedArgs) {
1686 Diag(Args[NumNamedArgs]->getLocStart(),
1687 diag::err_typecheck_call_too_many_args)
1688 << 2 /*method*/ << NumNamedArgs << static_cast<unsigned>(Args.size())
1689 << Method->getSourceRange()
1690 << SourceRange(Args[NumNamedArgs]->getLocStart(),
1691 Args.back()->getLocEnd());
1695 DiagnoseSentinelCalls(Method, SelLoc, Args);
1697 // Do additional checkings on method.
1698 IsError |= CheckObjCMethodCall(
1699 Method, SelLoc, makeArrayRef(Args.data(), Args.size()));
1704 bool Sema::isSelfExpr(Expr *RExpr) {
1705 // 'self' is objc 'self' in an objc method only.
1706 ObjCMethodDecl *Method =
1707 dyn_cast_or_null<ObjCMethodDecl>(CurContext->getNonClosureAncestor());
1708 return isSelfExpr(RExpr, Method);
1711 bool Sema::isSelfExpr(Expr *receiver, const ObjCMethodDecl *method) {
1712 if (!method) return false;
1714 receiver = receiver->IgnoreParenLValueCasts();
1715 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(receiver))
1716 if (DRE->getDecl() == method->getSelfDecl())
1721 /// LookupMethodInType - Look up a method in an ObjCObjectType.
1722 ObjCMethodDecl *Sema::LookupMethodInObjectType(Selector sel, QualType type,
1724 const ObjCObjectType *objType = type->castAs<ObjCObjectType>();
1725 if (ObjCInterfaceDecl *iface = objType->getInterface()) {
1726 // Look it up in the main interface (and categories, etc.)
1727 if (ObjCMethodDecl *method = iface->lookupMethod(sel, isInstance))
1730 // Okay, look for "private" methods declared in any
1731 // @implementations we've seen.
1732 if (ObjCMethodDecl *method = iface->lookupPrivateMethod(sel, isInstance))
1736 // Check qualifiers.
1737 for (const auto *I : objType->quals())
1738 if (ObjCMethodDecl *method = I->lookupMethod(sel, isInstance))
1744 /// LookupMethodInQualifiedType - Lookups up a method in protocol qualifier
1745 /// list of a qualified objective pointer type.
1746 ObjCMethodDecl *Sema::LookupMethodInQualifiedType(Selector Sel,
1747 const ObjCObjectPointerType *OPT,
1750 ObjCMethodDecl *MD = nullptr;
1751 for (const auto *PROTO : OPT->quals()) {
1752 if ((MD = PROTO->lookupMethod(Sel, Instance))) {
1759 /// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an
1760 /// objective C interface. This is a property reference expression.
1762 HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT,
1763 Expr *BaseExpr, SourceLocation OpLoc,
1764 DeclarationName MemberName,
1765 SourceLocation MemberLoc,
1766 SourceLocation SuperLoc, QualType SuperType,
1768 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType();
1769 ObjCInterfaceDecl *IFace = IFaceT->getDecl();
1771 if (!MemberName.isIdentifier()) {
1772 Diag(MemberLoc, diag::err_invalid_property_name)
1773 << MemberName << QualType(OPT, 0);
1777 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1779 SourceRange BaseRange = Super? SourceRange(SuperLoc)
1780 : BaseExpr->getSourceRange();
1781 if (RequireCompleteType(MemberLoc, OPT->getPointeeType(),
1782 diag::err_property_not_found_forward_class,
1783 MemberName, BaseRange))
1786 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(
1787 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1788 // Check whether we can reference this property.
1789 if (DiagnoseUseOfDecl(PD, MemberLoc))
1792 return new (Context)
1793 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1794 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1796 return new (Context)
1797 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1798 OK_ObjCProperty, MemberLoc, BaseExpr);
1800 // Check protocols on qualified interfaces.
1801 for (const auto *I : OPT->quals())
1802 if (ObjCPropertyDecl *PD = I->FindPropertyDeclaration(
1803 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1804 // Check whether we can reference this property.
1805 if (DiagnoseUseOfDecl(PD, MemberLoc))
1809 return new (Context) ObjCPropertyRefExpr(
1810 PD, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty, MemberLoc,
1811 SuperLoc, SuperType);
1813 return new (Context)
1814 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1815 OK_ObjCProperty, MemberLoc, BaseExpr);
1817 // If that failed, look for an "implicit" property by seeing if the nullary
1818 // selector is implemented.
1820 // FIXME: The logic for looking up nullary and unary selectors should be
1821 // shared with the code in ActOnInstanceMessage.
1823 Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
1824 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
1826 // May be found in property's qualified list.
1828 Getter = LookupMethodInQualifiedType(Sel, OPT, true);
1830 // If this reference is in an @implementation, check for 'private' methods.
1832 Getter = IFace->lookupPrivateMethod(Sel);
1835 // Check if we can reference this property.
1836 if (DiagnoseUseOfDecl(Getter, MemberLoc))
1839 // If we found a getter then this may be a valid dot-reference, we
1840 // will look for the matching setter, in case it is needed.
1841 Selector SetterSel =
1842 SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
1843 PP.getSelectorTable(), Member);
1844 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel);
1846 // May be found in property's qualified list.
1848 Setter = LookupMethodInQualifiedType(SetterSel, OPT, true);
1851 // If this reference is in an @implementation, also check for 'private'
1853 Setter = IFace->lookupPrivateMethod(SetterSel);
1856 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
1859 // Special warning if member name used in a property-dot for a setter accessor
1860 // does not use a property with same name; e.g. obj.X = ... for a property with
1862 if (Setter && Setter->isImplicit() && Setter->isPropertyAccessor() &&
1863 !IFace->FindPropertyDeclaration(
1864 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1865 if (const ObjCPropertyDecl *PDecl = Setter->findPropertyDecl()) {
1866 // Do not warn if user is using property-dot syntax to make call to
1867 // user named setter.
1868 if (!(PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter))
1870 diag::warn_property_access_suggest)
1871 << MemberName << QualType(OPT, 0) << PDecl->getName()
1872 << FixItHint::CreateReplacement(MemberLoc, PDecl->getName());
1876 if (Getter || Setter) {
1878 return new (Context)
1879 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1880 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1882 return new (Context)
1883 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1884 OK_ObjCProperty, MemberLoc, BaseExpr);
1888 // Attempt to correct for typos in property names.
1889 if (TypoCorrection Corrected =
1890 CorrectTypo(DeclarationNameInfo(MemberName, MemberLoc),
1891 LookupOrdinaryName, nullptr, nullptr,
1892 llvm::make_unique<DeclFilterCCC<ObjCPropertyDecl>>(),
1893 CTK_ErrorRecovery, IFace, false, OPT)) {
1894 DeclarationName TypoResult = Corrected.getCorrection();
1895 if (TypoResult.isIdentifier() &&
1896 TypoResult.getAsIdentifierInfo() == Member) {
1897 // There is no need to try the correction if it is the same.
1898 NamedDecl *ChosenDecl =
1899 Corrected.isKeyword() ? nullptr : Corrected.getFoundDecl();
1900 if (ChosenDecl && isa<ObjCPropertyDecl>(ChosenDecl))
1901 if (cast<ObjCPropertyDecl>(ChosenDecl)->isClassProperty()) {
1902 // This is a class property, we should not use the instance to
1904 Diag(MemberLoc, diag::err_class_property_found) << MemberName
1905 << OPT->getInterfaceDecl()->getName()
1906 << FixItHint::CreateReplacement(BaseExpr->getSourceRange(),
1907 OPT->getInterfaceDecl()->getName());
1911 diagnoseTypo(Corrected, PDiag(diag::err_property_not_found_suggest)
1912 << MemberName << QualType(OPT, 0));
1913 return HandleExprPropertyRefExpr(OPT, BaseExpr, OpLoc,
1914 TypoResult, MemberLoc,
1915 SuperLoc, SuperType, Super);
1918 ObjCInterfaceDecl *ClassDeclared;
1919 if (ObjCIvarDecl *Ivar =
1920 IFace->lookupInstanceVariable(Member, ClassDeclared)) {
1921 QualType T = Ivar->getType();
1922 if (const ObjCObjectPointerType * OBJPT =
1923 T->getAsObjCInterfacePointerType()) {
1924 if (RequireCompleteType(MemberLoc, OBJPT->getPointeeType(),
1925 diag::err_property_not_as_forward_class,
1926 MemberName, BaseExpr))
1930 diag::err_ivar_access_using_property_syntax_suggest)
1931 << MemberName << QualType(OPT, 0) << Ivar->getDeclName()
1932 << FixItHint::CreateReplacement(OpLoc, "->");
1936 Diag(MemberLoc, diag::err_property_not_found)
1937 << MemberName << QualType(OPT, 0);
1939 Diag(Setter->getLocation(), diag::note_getter_unavailable)
1940 << MemberName << BaseExpr->getSourceRange();
1945 ActOnClassPropertyRefExpr(IdentifierInfo &receiverName,
1946 IdentifierInfo &propertyName,
1947 SourceLocation receiverNameLoc,
1948 SourceLocation propertyNameLoc) {
1950 IdentifierInfo *receiverNamePtr = &receiverName;
1951 ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr,
1956 // If the "receiver" is 'super' in a method, handle it as an expression-like
1957 // property reference.
1958 if (receiverNamePtr->isStr("super")) {
1959 if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf(receiverNameLoc)) {
1960 if (auto classDecl = CurMethod->getClassInterface()) {
1961 SuperType = QualType(classDecl->getSuperClassType(), 0);
1962 if (CurMethod->isInstanceMethod()) {
1963 if (SuperType.isNull()) {
1964 // The current class does not have a superclass.
1965 Diag(receiverNameLoc, diag::err_root_class_cannot_use_super)
1966 << CurMethod->getClassInterface()->getIdentifier();
1969 QualType T = Context.getObjCObjectPointerType(SuperType);
1971 return HandleExprPropertyRefExpr(T->castAs<ObjCObjectPointerType>(),
1972 /*BaseExpr*/nullptr,
1973 SourceLocation()/*OpLoc*/,
1976 receiverNameLoc, T, true);
1979 // Otherwise, if this is a class method, try dispatching to our
1981 IFace = CurMethod->getClassInterface()->getSuperClass();
1987 Diag(receiverNameLoc, diag::err_expected_either) << tok::identifier
1995 if (auto PD = IFace->FindPropertyDeclaration(
1996 &propertyName, ObjCPropertyQueryKind::OBJC_PR_query_class)) {
1997 GetterSel = PD->getGetterName();
1998 SetterSel = PD->getSetterName();
2000 GetterSel = PP.getSelectorTable().getNullarySelector(&propertyName);
2001 SetterSel = SelectorTable::constructSetterSelector(
2002 PP.getIdentifierTable(), PP.getSelectorTable(), &propertyName);
2005 // Search for a declared property first.
2006 ObjCMethodDecl *Getter = IFace->lookupClassMethod(GetterSel);
2008 // If this reference is in an @implementation, check for 'private' methods.
2010 Getter = IFace->lookupPrivateClassMethod(GetterSel);
2013 // FIXME: refactor/share with ActOnMemberReference().
2014 // Check if we can reference this property.
2015 if (DiagnoseUseOfDecl(Getter, propertyNameLoc))
2019 // Look for the matching setter, in case it is needed.
2020 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
2022 // If this reference is in an @implementation, also check for 'private'
2024 Setter = IFace->lookupPrivateClassMethod(SetterSel);
2026 // Look through local category implementations associated with the class.
2028 Setter = IFace->getCategoryClassMethod(SetterSel);
2030 if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc))
2033 if (Getter || Setter) {
2034 if (!SuperType.isNull())
2035 return new (Context)
2036 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
2037 OK_ObjCProperty, propertyNameLoc, receiverNameLoc,
2040 return new (Context) ObjCPropertyRefExpr(
2041 Getter, Setter, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty,
2042 propertyNameLoc, receiverNameLoc, IFace);
2044 return ExprError(Diag(propertyNameLoc, diag::err_property_not_found)
2045 << &propertyName << Context.getObjCInterfaceType(IFace));
2050 class ObjCInterfaceOrSuperCCC : public CorrectionCandidateCallback {
2052 ObjCInterfaceOrSuperCCC(ObjCMethodDecl *Method) {
2053 // Determine whether "super" is acceptable in the current context.
2054 if (Method && Method->getClassInterface())
2055 WantObjCSuper = Method->getClassInterface()->getSuperClass();
2058 bool ValidateCandidate(const TypoCorrection &candidate) override {
2059 return candidate.getCorrectionDeclAs<ObjCInterfaceDecl>() ||
2060 candidate.isKeyword("super");
2064 } // end anonymous namespace
2066 Sema::ObjCMessageKind Sema::getObjCMessageKind(Scope *S,
2067 IdentifierInfo *Name,
2068 SourceLocation NameLoc,
2070 bool HasTrailingDot,
2071 ParsedType &ReceiverType) {
2072 ReceiverType = nullptr;
2074 // If the identifier is "super" and there is no trailing dot, we're
2075 // messaging super. If the identifier is "super" and there is a
2076 // trailing dot, it's an instance message.
2077 if (IsSuper && S->isInObjcMethodScope())
2078 return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage;
2080 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
2081 LookupName(Result, S);
2083 switch (Result.getResultKind()) {
2084 case LookupResult::NotFound:
2085 // Normal name lookup didn't find anything. If we're in an
2086 // Objective-C method, look for ivars. If we find one, we're done!
2087 // FIXME: This is a hack. Ivar lookup should be part of normal
2089 if (ObjCMethodDecl *Method = getCurMethodDecl()) {
2090 if (!Method->getClassInterface()) {
2091 // Fall back: let the parser try to parse it as an instance message.
2092 return ObjCInstanceMessage;
2095 ObjCInterfaceDecl *ClassDeclared;
2096 if (Method->getClassInterface()->lookupInstanceVariable(Name,
2098 return ObjCInstanceMessage;
2101 // Break out; we'll perform typo correction below.
2104 case LookupResult::NotFoundInCurrentInstantiation:
2105 case LookupResult::FoundOverloaded:
2106 case LookupResult::FoundUnresolvedValue:
2107 case LookupResult::Ambiguous:
2108 Result.suppressDiagnostics();
2109 return ObjCInstanceMessage;
2111 case LookupResult::Found: {
2112 // If the identifier is a class or not, and there is a trailing dot,
2113 // it's an instance message.
2115 return ObjCInstanceMessage;
2116 // We found something. If it's a type, then we have a class
2117 // message. Otherwise, it's an instance message.
2118 NamedDecl *ND = Result.getFoundDecl();
2120 if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND))
2121 T = Context.getObjCInterfaceType(Class);
2122 else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND)) {
2123 T = Context.getTypeDeclType(Type);
2124 DiagnoseUseOfDecl(Type, NameLoc);
2127 return ObjCInstanceMessage;
2129 // We have a class message, and T is the type we're
2130 // messaging. Build source-location information for it.
2131 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2132 ReceiverType = CreateParsedType(T, TSInfo);
2133 return ObjCClassMessage;
2137 if (TypoCorrection Corrected = CorrectTypo(
2138 Result.getLookupNameInfo(), Result.getLookupKind(), S, nullptr,
2139 llvm::make_unique<ObjCInterfaceOrSuperCCC>(getCurMethodDecl()),
2140 CTK_ErrorRecovery, nullptr, false, nullptr, false)) {
2141 if (Corrected.isKeyword()) {
2142 // If we've found the keyword "super" (the only keyword that would be
2143 // returned by CorrectTypo), this is a send to super.
2144 diagnoseTypo(Corrected,
2145 PDiag(diag::err_unknown_receiver_suggest) << Name);
2146 return ObjCSuperMessage;
2147 } else if (ObjCInterfaceDecl *Class =
2148 Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>()) {
2149 // If we found a declaration, correct when it refers to an Objective-C
2151 diagnoseTypo(Corrected,
2152 PDiag(diag::err_unknown_receiver_suggest) << Name);
2153 QualType T = Context.getObjCInterfaceType(Class);
2154 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2155 ReceiverType = CreateParsedType(T, TSInfo);
2156 return ObjCClassMessage;
2160 // Fall back: let the parser try to parse it as an instance message.
2161 return ObjCInstanceMessage;
2164 ExprResult Sema::ActOnSuperMessage(Scope *S,
2165 SourceLocation SuperLoc,
2167 SourceLocation LBracLoc,
2168 ArrayRef<SourceLocation> SelectorLocs,
2169 SourceLocation RBracLoc,
2170 MultiExprArg Args) {
2171 // Determine whether we are inside a method or not.
2172 ObjCMethodDecl *Method = tryCaptureObjCSelf(SuperLoc);
2174 Diag(SuperLoc, diag::err_invalid_receiver_to_message_super);
2178 ObjCInterfaceDecl *Class = Method->getClassInterface();
2180 Diag(SuperLoc, diag::err_no_super_class_message)
2181 << Method->getDeclName();
2185 QualType SuperTy(Class->getSuperClassType(), 0);
2186 if (SuperTy.isNull()) {
2187 // The current class does not have a superclass.
2188 Diag(SuperLoc, diag::err_root_class_cannot_use_super)
2189 << Class->getIdentifier();
2193 // We are in a method whose class has a superclass, so 'super'
2194 // is acting as a keyword.
2195 if (Method->getSelector() == Sel)
2196 getCurFunction()->ObjCShouldCallSuper = false;
2198 if (Method->isInstanceMethod()) {
2199 // Since we are in an instance method, this is an instance
2200 // message to the superclass instance.
2201 SuperTy = Context.getObjCObjectPointerType(SuperTy);
2202 return BuildInstanceMessage(nullptr, SuperTy, SuperLoc,
2203 Sel, /*Method=*/nullptr,
2204 LBracLoc, SelectorLocs, RBracLoc, Args);
2207 // Since we are in a class method, this is a class message to
2209 return BuildClassMessage(/*ReceiverTypeInfo=*/nullptr,
2211 SuperLoc, Sel, /*Method=*/nullptr,
2212 LBracLoc, SelectorLocs, RBracLoc, Args);
2215 ExprResult Sema::BuildClassMessageImplicit(QualType ReceiverType,
2216 bool isSuperReceiver,
2219 ObjCMethodDecl *Method,
2220 MultiExprArg Args) {
2221 TypeSourceInfo *receiverTypeInfo = nullptr;
2222 if (!ReceiverType.isNull())
2223 receiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType);
2225 return BuildClassMessage(receiverTypeInfo, ReceiverType,
2226 /*SuperLoc=*/isSuperReceiver ? Loc : SourceLocation(),
2227 Sel, Method, Loc, Loc, Loc, Args,
2228 /*isImplicit=*/true);
2231 static void applyCocoaAPICheck(Sema &S, const ObjCMessageExpr *Msg,
2233 bool (*refactor)(const ObjCMessageExpr *,
2234 const NSAPI &, edit::Commit &)) {
2235 SourceLocation MsgLoc = Msg->getExprLoc();
2236 if (S.Diags.isIgnored(DiagID, MsgLoc))
2239 SourceManager &SM = S.SourceMgr;
2240 edit::Commit ECommit(SM, S.LangOpts);
2241 if (refactor(Msg,*S.NSAPIObj, ECommit)) {
2242 DiagnosticBuilder Builder = S.Diag(MsgLoc, DiagID)
2243 << Msg->getSelector() << Msg->getSourceRange();
2244 // FIXME: Don't emit diagnostic at all if fixits are non-commitable.
2245 if (!ECommit.isCommitable())
2247 for (edit::Commit::edit_iterator
2248 I = ECommit.edit_begin(), E = ECommit.edit_end(); I != E; ++I) {
2249 const edit::Commit::Edit &Edit = *I;
2250 switch (Edit.Kind) {
2251 case edit::Commit::Act_Insert:
2252 Builder.AddFixItHint(FixItHint::CreateInsertion(Edit.OrigLoc,
2256 case edit::Commit::Act_InsertFromRange:
2257 Builder.AddFixItHint(
2258 FixItHint::CreateInsertionFromRange(Edit.OrigLoc,
2259 Edit.getInsertFromRange(SM),
2262 case edit::Commit::Act_Remove:
2263 Builder.AddFixItHint(FixItHint::CreateRemoval(Edit.getFileRange(SM)));
2270 static void checkCocoaAPI(Sema &S, const ObjCMessageExpr *Msg) {
2271 applyCocoaAPICheck(S, Msg, diag::warn_objc_redundant_literal_use,
2272 edit::rewriteObjCRedundantCallWithLiteral);
2275 static void checkFoundationAPI(Sema &S, SourceLocation Loc,
2276 const ObjCMethodDecl *Method,
2277 ArrayRef<Expr *> Args, QualType ReceiverType,
2278 bool IsClassObjectCall) {
2279 // Check if this is a performSelector method that uses a selector that returns
2280 // a record or a vector type.
2281 if (Method->getSelector().getMethodFamily() != OMF_performSelector ||
2284 const auto *SE = dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens());
2287 ObjCMethodDecl *ImpliedMethod;
2288 if (!IsClassObjectCall) {
2289 const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>();
2290 if (!OPT || !OPT->getInterfaceDecl())
2293 OPT->getInterfaceDecl()->lookupInstanceMethod(SE->getSelector());
2296 OPT->getInterfaceDecl()->lookupPrivateMethod(SE->getSelector());
2298 const auto *IT = ReceiverType->getAs<ObjCInterfaceType>();
2301 ImpliedMethod = IT->getDecl()->lookupClassMethod(SE->getSelector());
2304 IT->getDecl()->lookupPrivateClassMethod(SE->getSelector());
2308 QualType Ret = ImpliedMethod->getReturnType();
2309 if (Ret->isRecordType() || Ret->isVectorType() || Ret->isExtVectorType()) {
2310 QualType Ret = ImpliedMethod->getReturnType();
2311 S.Diag(Loc, diag::warn_objc_unsafe_perform_selector)
2312 << Method->getSelector()
2313 << (!Ret->isRecordType()
2315 : Ret->isUnionType() ? /*Union*/ 1 : /*Struct*/ 0);
2316 S.Diag(ImpliedMethod->getLocStart(),
2317 diag::note_objc_unsafe_perform_selector_method_declared_here)
2318 << ImpliedMethod->getSelector() << Ret;
2322 /// \brief Diagnose use of %s directive in an NSString which is being passed
2323 /// as formatting string to formatting method.
2325 DiagnoseCStringFormatDirectiveInObjCAPI(Sema &S,
2326 ObjCMethodDecl *Method,
2328 Expr **Args, unsigned NumArgs) {
2330 bool Format = false;
2331 ObjCStringFormatFamily SFFamily = Sel.getStringFormatFamily();
2332 if (SFFamily == ObjCStringFormatFamily::SFF_NSString) {
2337 for (const auto *I : Method->specific_attrs<FormatAttr>()) {
2338 if (S.GetFormatNSStringIdx(I, Idx)) {
2344 if (!Format || NumArgs <= Idx)
2347 Expr *FormatExpr = Args[Idx];
2348 if (ObjCStringLiteral *OSL =
2349 dyn_cast<ObjCStringLiteral>(FormatExpr->IgnoreParenImpCasts())) {
2350 StringLiteral *FormatString = OSL->getString();
2351 if (S.FormatStringHasSArg(FormatString)) {
2352 S.Diag(FormatExpr->getExprLoc(), diag::warn_objc_cdirective_format_string)
2355 S.Diag(Method->getLocation(), diag::note_method_declared_at)
2356 << Method->getDeclName();
2361 /// \brief Build an Objective-C class message expression.
2363 /// This routine takes care of both normal class messages and
2364 /// class messages to the superclass.
2366 /// \param ReceiverTypeInfo Type source information that describes the
2367 /// receiver of this message. This may be NULL, in which case we are
2368 /// sending to the superclass and \p SuperLoc must be a valid source
2371 /// \param ReceiverType The type of the object receiving the
2372 /// message. When \p ReceiverTypeInfo is non-NULL, this is the same
2373 /// type as that refers to. For a superclass send, this is the type of
2376 /// \param SuperLoc The location of the "super" keyword in a
2377 /// superclass message.
2379 /// \param Sel The selector to which the message is being sent.
2381 /// \param Method The method that this class message is invoking, if
2384 /// \param LBracLoc The location of the opening square bracket ']'.
2386 /// \param RBracLoc The location of the closing square bracket ']'.
2388 /// \param ArgsIn The message arguments.
2389 ExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo,
2390 QualType ReceiverType,
2391 SourceLocation SuperLoc,
2393 ObjCMethodDecl *Method,
2394 SourceLocation LBracLoc,
2395 ArrayRef<SourceLocation> SelectorLocs,
2396 SourceLocation RBracLoc,
2397 MultiExprArg ArgsIn,
2399 SourceLocation Loc = SuperLoc.isValid()? SuperLoc
2400 : ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin();
2401 if (LBracLoc.isInvalid()) {
2402 Diag(Loc, diag::err_missing_open_square_message_send)
2403 << FixItHint::CreateInsertion(Loc, "[");
2406 SourceLocation SelLoc;
2407 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2408 SelLoc = SelectorLocs.front();
2412 if (ReceiverType->isDependentType()) {
2413 // If the receiver type is dependent, we can't type-check anything
2414 // at this point. Build a dependent expression.
2415 unsigned NumArgs = ArgsIn.size();
2416 Expr **Args = ArgsIn.data();
2417 assert(SuperLoc.isInvalid() && "Message to super with dependent type");
2418 return ObjCMessageExpr::Create(
2419 Context, ReceiverType, VK_RValue, LBracLoc, ReceiverTypeInfo, Sel,
2420 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs), RBracLoc,
2424 // Find the class to which we are sending this message.
2425 ObjCInterfaceDecl *Class = nullptr;
2426 const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>();
2427 if (!ClassType || !(Class = ClassType->getInterface())) {
2428 Diag(Loc, diag::err_invalid_receiver_class_message)
2432 assert(Class && "We don't know which class we're messaging?");
2433 // objc++ diagnoses during typename annotation.
2434 if (!getLangOpts().CPlusPlus)
2435 (void)DiagnoseUseOfDecl(Class, SelLoc);
2436 // Find the method we are messaging.
2438 SourceRange TypeRange
2439 = SuperLoc.isValid()? SourceRange(SuperLoc)
2440 : ReceiverTypeInfo->getTypeLoc().getSourceRange();
2441 if (RequireCompleteType(Loc, Context.getObjCInterfaceType(Class),
2442 (getLangOpts().ObjCAutoRefCount
2443 ? diag::err_arc_receiver_forward_class
2444 : diag::warn_receiver_forward_class),
2446 // A forward class used in messaging is treated as a 'Class'
2447 Method = LookupFactoryMethodInGlobalPool(Sel,
2448 SourceRange(LBracLoc, RBracLoc));
2449 if (Method && !getLangOpts().ObjCAutoRefCount)
2450 Diag(Method->getLocation(), diag::note_method_sent_forward_class)
2451 << Method->getDeclName();
2454 Method = Class->lookupClassMethod(Sel);
2456 // If we have an implementation in scope, check "private" methods.
2458 Method = Class->lookupPrivateClassMethod(Sel);
2460 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2464 // Check the argument types and determine the result type.
2465 QualType ReturnType;
2466 ExprValueKind VK = VK_RValue;
2468 unsigned NumArgs = ArgsIn.size();
2469 Expr **Args = ArgsIn.data();
2470 if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2473 SuperLoc.isValid(), LBracLoc, RBracLoc,
2478 if (Method && !Method->getReturnType()->isVoidType() &&
2479 RequireCompleteType(LBracLoc, Method->getReturnType(),
2480 diag::err_illegal_message_expr_incomplete_type))
2483 // Warn about explicit call of +initialize on its own class. But not on 'super'.
2484 if (Method && Method->getMethodFamily() == OMF_initialize) {
2485 if (!SuperLoc.isValid()) {
2486 const ObjCInterfaceDecl *ID =
2487 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext());
2489 Diag(Loc, diag::warn_direct_initialize_call);
2490 Diag(Method->getLocation(), diag::note_method_declared_at)
2491 << Method->getDeclName();
2494 else if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2495 // [super initialize] is allowed only within an +initialize implementation
2496 if (CurMeth->getMethodFamily() != OMF_initialize) {
2497 Diag(Loc, diag::warn_direct_super_initialize_call);
2498 Diag(Method->getLocation(), diag::note_method_declared_at)
2499 << Method->getDeclName();
2500 Diag(CurMeth->getLocation(), diag::note_method_declared_at)
2501 << CurMeth->getDeclName();
2506 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
2508 // Construct the appropriate ObjCMessageExpr.
2509 ObjCMessageExpr *Result;
2510 if (SuperLoc.isValid())
2511 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2512 SuperLoc, /*IsInstanceSuper=*/false,
2513 ReceiverType, Sel, SelectorLocs,
2514 Method, makeArrayRef(Args, NumArgs),
2515 RBracLoc, isImplicit);
2517 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2518 ReceiverTypeInfo, Sel, SelectorLocs,
2519 Method, makeArrayRef(Args, NumArgs),
2520 RBracLoc, isImplicit);
2522 checkCocoaAPI(*this, Result);
2525 checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs),
2526 ReceiverType, /*IsClassObjectCall=*/true);
2527 return MaybeBindToTemporary(Result);
2530 // ActOnClassMessage - used for both unary and keyword messages.
2531 // ArgExprs is optional - if it is present, the number of expressions
2532 // is obtained from Sel.getNumArgs().
2533 ExprResult Sema::ActOnClassMessage(Scope *S,
2534 ParsedType Receiver,
2536 SourceLocation LBracLoc,
2537 ArrayRef<SourceLocation> SelectorLocs,
2538 SourceLocation RBracLoc,
2539 MultiExprArg Args) {
2540 TypeSourceInfo *ReceiverTypeInfo;
2541 QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo);
2542 if (ReceiverType.isNull())
2545 if (!ReceiverTypeInfo)
2546 ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc);
2548 return BuildClassMessage(ReceiverTypeInfo, ReceiverType,
2549 /*SuperLoc=*/SourceLocation(), Sel,
2550 /*Method=*/nullptr, LBracLoc, SelectorLocs, RBracLoc,
2554 ExprResult Sema::BuildInstanceMessageImplicit(Expr *Receiver,
2555 QualType ReceiverType,
2558 ObjCMethodDecl *Method,
2559 MultiExprArg Args) {
2560 return BuildInstanceMessage(Receiver, ReceiverType,
2561 /*SuperLoc=*/!Receiver ? Loc : SourceLocation(),
2562 Sel, Method, Loc, Loc, Loc, Args,
2563 /*isImplicit=*/true);
2566 static bool isMethodDeclaredInRootProtocol(Sema &S, const ObjCMethodDecl *M) {
2569 const auto *Protocol = dyn_cast<ObjCProtocolDecl>(M->getDeclContext());
2572 const IdentifierInfo *II = S.NSAPIObj->getNSClassId(NSAPI::ClassId_NSObject);
2573 if (const auto *RootClass = dyn_cast_or_null<ObjCInterfaceDecl>(
2574 S.LookupSingleName(S.TUScope, II, Protocol->getLocStart(),
2575 Sema::LookupOrdinaryName))) {
2576 for (const ObjCProtocolDecl *P : RootClass->all_referenced_protocols()) {
2577 if (P->getCanonicalDecl() == Protocol->getCanonicalDecl())
2584 /// \brief Build an Objective-C instance message expression.
2586 /// This routine takes care of both normal instance messages and
2587 /// instance messages to the superclass instance.
2589 /// \param Receiver The expression that computes the object that will
2590 /// receive this message. This may be empty, in which case we are
2591 /// sending to the superclass instance and \p SuperLoc must be a valid
2592 /// source location.
2594 /// \param ReceiverType The (static) type of the object receiving the
2595 /// message. When a \p Receiver expression is provided, this is the
2596 /// same type as that expression. For a superclass instance send, this
2597 /// is a pointer to the type of the superclass.
2599 /// \param SuperLoc The location of the "super" keyword in a
2600 /// superclass instance message.
2602 /// \param Sel The selector to which the message is being sent.
2604 /// \param Method The method that this instance message is invoking, if
2607 /// \param LBracLoc The location of the opening square bracket ']'.
2609 /// \param RBracLoc The location of the closing square bracket ']'.
2611 /// \param ArgsIn The message arguments.
2612 ExprResult Sema::BuildInstanceMessage(Expr *Receiver,
2613 QualType ReceiverType,
2614 SourceLocation SuperLoc,
2616 ObjCMethodDecl *Method,
2617 SourceLocation LBracLoc,
2618 ArrayRef<SourceLocation> SelectorLocs,
2619 SourceLocation RBracLoc,
2620 MultiExprArg ArgsIn,
2622 assert((Receiver || SuperLoc.isValid()) && "If the Receiver is null, the "
2623 "SuperLoc must be valid so we can "
2626 // The location of the receiver.
2627 SourceLocation Loc = SuperLoc.isValid()? SuperLoc : Receiver->getLocStart();
2628 SourceRange RecRange =
2629 SuperLoc.isValid()? SuperLoc : Receiver->getSourceRange();
2630 SourceLocation SelLoc;
2631 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2632 SelLoc = SelectorLocs.front();
2636 if (LBracLoc.isInvalid()) {
2637 Diag(Loc, diag::err_missing_open_square_message_send)
2638 << FixItHint::CreateInsertion(Loc, "[");
2642 // If we have a receiver expression, perform appropriate promotions
2643 // and determine receiver type.
2645 if (Receiver->hasPlaceholderType()) {
2647 if (Receiver->getType() == Context.UnknownAnyTy)
2648 Result = forceUnknownAnyToType(Receiver, Context.getObjCIdType());
2650 Result = CheckPlaceholderExpr(Receiver);
2651 if (Result.isInvalid()) return ExprError();
2652 Receiver = Result.get();
2655 if (Receiver->isTypeDependent()) {
2656 // If the receiver is type-dependent, we can't type-check anything
2657 // at this point. Build a dependent expression.
2658 unsigned NumArgs = ArgsIn.size();
2659 Expr **Args = ArgsIn.data();
2660 assert(SuperLoc.isInvalid() && "Message to super with dependent type");
2661 return ObjCMessageExpr::Create(
2662 Context, Context.DependentTy, VK_RValue, LBracLoc, Receiver, Sel,
2663 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs),
2664 RBracLoc, isImplicit);
2667 // If necessary, apply function/array conversion to the receiver.
2668 // C99 6.7.5.3p[7,8].
2669 ExprResult Result = DefaultFunctionArrayLvalueConversion(Receiver);
2670 if (Result.isInvalid())
2672 Receiver = Result.get();
2673 ReceiverType = Receiver->getType();
2675 // If the receiver is an ObjC pointer, a block pointer, or an
2676 // __attribute__((NSObject)) pointer, we don't need to do any
2677 // special conversion in order to look up a receiver.
2678 if (ReceiverType->isObjCRetainableType()) {
2680 } else if (!getLangOpts().ObjCAutoRefCount &&
2681 !Context.getObjCIdType().isNull() &&
2682 (ReceiverType->isPointerType() ||
2683 ReceiverType->isIntegerType())) {
2684 // Implicitly convert integers and pointers to 'id' but emit a warning.
2686 Diag(Loc, diag::warn_bad_receiver_type)
2688 << Receiver->getSourceRange();
2689 if (ReceiverType->isPointerType()) {
2690 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2691 CK_CPointerToObjCPointerCast).get();
2693 // TODO: specialized warning on null receivers?
2694 bool IsNull = Receiver->isNullPointerConstant(Context,
2695 Expr::NPC_ValueDependentIsNull);
2696 CastKind Kind = IsNull ? CK_NullToPointer : CK_IntegralToPointer;
2697 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2700 ReceiverType = Receiver->getType();
2701 } else if (getLangOpts().CPlusPlus) {
2702 // The receiver must be a complete type.
2703 if (RequireCompleteType(Loc, Receiver->getType(),
2704 diag::err_incomplete_receiver_type))
2707 ExprResult result = PerformContextuallyConvertToObjCPointer(Receiver);
2708 if (result.isUsable()) {
2709 Receiver = result.get();
2710 ReceiverType = Receiver->getType();
2715 if (ReceiverType->isObjCIdType() && !isImplicit)
2716 Diag(Receiver->getExprLoc(), diag::warn_messaging_unqualified_id);
2718 // There's a somewhat weird interaction here where we assume that we
2719 // won't actually have a method unless we also don't need to do some
2720 // of the more detailed type-checking on the receiver.
2723 // Handle messages to id and __kindof types (where we use the
2724 // global method pool).
2725 const ObjCObjectType *typeBound = nullptr;
2726 bool receiverIsIdLike = ReceiverType->isObjCIdOrObjectKindOfType(Context,
2728 if (receiverIsIdLike || ReceiverType->isBlockPointerType() ||
2729 (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) {
2730 SmallVector<ObjCMethodDecl*, 4> Methods;
2731 // If we have a type bound, further filter the methods.
2732 CollectMultipleMethodsInGlobalPool(Sel, Methods, true/*InstanceFirst*/,
2733 true/*CheckTheOther*/, typeBound);
2734 if (!Methods.empty()) {
2735 // We choose the first method as the initial candidate, then try to
2736 // select a better one.
2737 Method = Methods[0];
2739 if (ObjCMethodDecl *BestMethod =
2740 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(), Methods))
2741 Method = BestMethod;
2743 if (!AreMultipleMethodsInGlobalPool(Sel, Method,
2744 SourceRange(LBracLoc, RBracLoc),
2745 receiverIsIdLike, Methods))
2746 DiagnoseUseOfDecl(Method, SelLoc);
2748 } else if (ReceiverType->isObjCClassOrClassKindOfType() ||
2749 ReceiverType->isObjCQualifiedClassType()) {
2750 // Handle messages to Class.
2751 // We allow sending a message to a qualified Class ("Class<foo>"), which
2752 // is ok as long as one of the protocols implements the selector (if not,
2754 if (!ReceiverType->isObjCClassOrClassKindOfType()) {
2755 const ObjCObjectPointerType *QClassTy
2756 = ReceiverType->getAsObjCQualifiedClassType();
2757 // Search protocols for class methods.
2758 Method = LookupMethodInQualifiedType(Sel, QClassTy, false);
2760 Method = LookupMethodInQualifiedType(Sel, QClassTy, true);
2761 // warn if instance method found for a Class message.
2762 if (Method && !isMethodDeclaredInRootProtocol(*this, Method)) {
2763 Diag(SelLoc, diag::warn_instance_method_on_class_found)
2764 << Method->getSelector() << Sel;
2765 Diag(Method->getLocation(), diag::note_method_declared_at)
2766 << Method->getDeclName();
2770 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2771 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) {
2772 // First check the public methods in the class interface.
2773 Method = ClassDecl->lookupClassMethod(Sel);
2776 Method = ClassDecl->lookupPrivateClassMethod(Sel);
2778 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2782 // If not messaging 'self', look for any factory method named 'Sel'.
2783 if (!Receiver || !isSelfExpr(Receiver)) {
2784 // If no class (factory) method was found, check if an _instance_
2785 // method of the same name exists in the root class only.
2786 SmallVector<ObjCMethodDecl*, 4> Methods;
2787 CollectMultipleMethodsInGlobalPool(Sel, Methods,
2788 false/*InstanceFirst*/,
2789 true/*CheckTheOther*/);
2790 if (!Methods.empty()) {
2791 // We choose the first method as the initial candidate, then try
2792 // to select a better one.
2793 Method = Methods[0];
2795 // If we find an instance method, emit waring.
2796 if (Method->isInstanceMethod()) {
2797 if (const ObjCInterfaceDecl *ID =
2798 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) {
2799 if (ID->getSuperClass())
2800 Diag(SelLoc, diag::warn_root_inst_method_not_found)
2801 << Sel << SourceRange(LBracLoc, RBracLoc);
2805 if (ObjCMethodDecl *BestMethod =
2806 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2808 Method = BestMethod;
2814 ObjCInterfaceDecl *ClassDecl = nullptr;
2816 // We allow sending a message to a qualified ID ("id<foo>"), which is ok as
2817 // long as one of the protocols implements the selector (if not, warn).
2818 // And as long as message is not deprecated/unavailable (warn if it is).
2819 if (const ObjCObjectPointerType *QIdTy
2820 = ReceiverType->getAsObjCQualifiedIdType()) {
2821 // Search protocols for instance methods.
2822 Method = LookupMethodInQualifiedType(Sel, QIdTy, true);
2824 Method = LookupMethodInQualifiedType(Sel, QIdTy, false);
2825 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2827 } else if (const ObjCObjectPointerType *OCIType
2828 = ReceiverType->getAsObjCInterfacePointerType()) {
2829 // We allow sending a message to a pointer to an interface (an object).
2830 ClassDecl = OCIType->getInterfaceDecl();
2832 // Try to complete the type. Under ARC, this is a hard error from which
2833 // we don't try to recover.
2834 // FIXME: In the non-ARC case, this will still be a hard error if the
2835 // definition is found in a module that's not visible.
2836 const ObjCInterfaceDecl *forwardClass = nullptr;
2837 if (RequireCompleteType(Loc, OCIType->getPointeeType(),
2838 getLangOpts().ObjCAutoRefCount
2839 ? diag::err_arc_receiver_forward_instance
2840 : diag::warn_receiver_forward_instance,
2841 Receiver? Receiver->getSourceRange()
2842 : SourceRange(SuperLoc))) {
2843 if (getLangOpts().ObjCAutoRefCount)
2846 forwardClass = OCIType->getInterfaceDecl();
2847 Diag(Receiver ? Receiver->getLocStart()
2848 : SuperLoc, diag::note_receiver_is_id);
2851 Method = ClassDecl->lookupInstanceMethod(Sel);
2855 // Search protocol qualifiers.
2856 Method = LookupMethodInQualifiedType(Sel, OCIType, true);
2859 // If we have implementations in scope, check "private" methods.
2860 Method = ClassDecl->lookupPrivateMethod(Sel);
2862 if (!Method && getLangOpts().ObjCAutoRefCount) {
2863 Diag(SelLoc, diag::err_arc_may_not_respond)
2864 << OCIType->getPointeeType() << Sel << RecRange
2865 << SourceRange(SelectorLocs.front(), SelectorLocs.back());
2869 if (!Method && (!Receiver || !isSelfExpr(Receiver))) {
2870 // If we still haven't found a method, look in the global pool. This
2871 // behavior isn't very desirable, however we need it for GCC
2872 // compatibility. FIXME: should we deviate??
2873 if (OCIType->qual_empty()) {
2874 SmallVector<ObjCMethodDecl*, 4> Methods;
2875 CollectMultipleMethodsInGlobalPool(Sel, Methods,
2876 true/*InstanceFirst*/,
2877 false/*CheckTheOther*/);
2878 if (!Methods.empty()) {
2879 // We choose the first method as the initial candidate, then try
2880 // to select a better one.
2881 Method = Methods[0];
2883 if (ObjCMethodDecl *BestMethod =
2884 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2886 Method = BestMethod;
2888 AreMultipleMethodsInGlobalPool(Sel, Method,
2889 SourceRange(LBracLoc, RBracLoc),
2890 true/*receiverIdOrClass*/,
2893 if (Method && !forwardClass)
2894 Diag(SelLoc, diag::warn_maynot_respond)
2895 << OCIType->getInterfaceDecl()->getIdentifier()
2900 if (Method && DiagnoseUseOfDecl(Method, SelLoc, forwardClass))
2903 // Reject other random receiver types (e.g. structs).
2904 Diag(Loc, diag::err_bad_receiver_type)
2905 << ReceiverType << Receiver->getSourceRange();
2911 FunctionScopeInfo *DIFunctionScopeInfo =
2912 (Method && Method->getMethodFamily() == OMF_init)
2913 ? getEnclosingFunction() : nullptr;
2915 if (DIFunctionScopeInfo &&
2916 DIFunctionScopeInfo->ObjCIsDesignatedInit &&
2917 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2918 bool isDesignatedInitChain = false;
2919 if (SuperLoc.isValid()) {
2920 if (const ObjCObjectPointerType *
2921 OCIType = ReceiverType->getAsObjCInterfacePointerType()) {
2922 if (const ObjCInterfaceDecl *ID = OCIType->getInterfaceDecl()) {
2923 // Either we know this is a designated initializer or we
2924 // conservatively assume it because we don't know for sure.
2925 if (!ID->declaresOrInheritsDesignatedInitializers() ||
2926 ID->isDesignatedInitializer(Sel)) {
2927 isDesignatedInitChain = true;
2928 DIFunctionScopeInfo->ObjCWarnForNoDesignatedInitChain = false;
2933 if (!isDesignatedInitChain) {
2934 const ObjCMethodDecl *InitMethod = nullptr;
2936 getCurMethodDecl()->isDesignatedInitializerForTheInterface(&InitMethod);
2937 assert(isDesignated && InitMethod);
2939 Diag(SelLoc, SuperLoc.isValid() ?
2940 diag::warn_objc_designated_init_non_designated_init_call :
2941 diag::warn_objc_designated_init_non_super_designated_init_call);
2942 Diag(InitMethod->getLocation(),
2943 diag::note_objc_designated_init_marked_here);
2947 if (DIFunctionScopeInfo &&
2948 DIFunctionScopeInfo->ObjCIsSecondaryInit &&
2949 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2950 if (SuperLoc.isValid()) {
2951 Diag(SelLoc, diag::warn_objc_secondary_init_super_init_call);
2953 DIFunctionScopeInfo->ObjCWarnForNoInitDelegation = false;
2957 // Check the message arguments.
2958 unsigned NumArgs = ArgsIn.size();
2959 Expr **Args = ArgsIn.data();
2960 QualType ReturnType;
2961 ExprValueKind VK = VK_RValue;
2962 bool ClassMessage = (ReceiverType->isObjCClassType() ||
2963 ReceiverType->isObjCQualifiedClassType());
2964 if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2965 Sel, SelectorLocs, Method,
2966 ClassMessage, SuperLoc.isValid(),
2967 LBracLoc, RBracLoc, RecRange, ReturnType, VK))
2970 if (Method && !Method->getReturnType()->isVoidType() &&
2971 RequireCompleteType(LBracLoc, Method->getReturnType(),
2972 diag::err_illegal_message_expr_incomplete_type))
2975 // In ARC, forbid the user from sending messages to
2976 // retain/release/autorelease/dealloc/retainCount explicitly.
2977 if (getLangOpts().ObjCAutoRefCount) {
2978 ObjCMethodFamily family =
2979 (Method ? Method->getMethodFamily() : Sel.getMethodFamily());
2983 checkInitMethod(Method, ReceiverType);
2990 case OMF_mutableCopy:
2993 case OMF_initialize:
2999 case OMF_autorelease:
3000 case OMF_retainCount:
3001 Diag(SelLoc, diag::err_arc_illegal_explicit_message)
3005 case OMF_performSelector:
3006 if (Method && NumArgs >= 1) {
3007 if (const auto *SelExp =
3008 dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens())) {
3009 Selector ArgSel = SelExp->getSelector();
3010 ObjCMethodDecl *SelMethod =
3011 LookupInstanceMethodInGlobalPool(ArgSel,
3012 SelExp->getSourceRange());
3015 LookupFactoryMethodInGlobalPool(ArgSel,
3016 SelExp->getSourceRange());
3018 ObjCMethodFamily SelFamily = SelMethod->getMethodFamily();
3019 switch (SelFamily) {
3022 case OMF_mutableCopy:
3025 // Issue error, unless ns_returns_not_retained.
3026 if (!SelMethod->hasAttr<NSReturnsNotRetainedAttr>()) {
3027 // selector names a +1 method
3029 diag::err_arc_perform_selector_retains);
3030 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
3031 << SelMethod->getDeclName();
3035 // +0 call. OK. unless ns_returns_retained.
3036 if (SelMethod->hasAttr<NSReturnsRetainedAttr>()) {
3037 // selector names a +1 method
3039 diag::err_arc_perform_selector_retains);
3040 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
3041 << SelMethod->getDeclName();
3047 // error (may leak).
3048 Diag(SelLoc, diag::warn_arc_perform_selector_leaks);
3049 Diag(Args[0]->getExprLoc(), diag::note_used_here);
3056 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
3058 // Construct the appropriate ObjCMessageExpr instance.
3059 ObjCMessageExpr *Result;
3060 if (SuperLoc.isValid())
3061 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
3062 SuperLoc, /*IsInstanceSuper=*/true,
3063 ReceiverType, Sel, SelectorLocs, Method,
3064 makeArrayRef(Args, NumArgs), RBracLoc,
3067 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
3068 Receiver, Sel, SelectorLocs, Method,
3069 makeArrayRef(Args, NumArgs), RBracLoc,
3072 checkCocoaAPI(*this, Result);
3075 bool IsClassObjectCall = ClassMessage;
3076 // 'self' message receivers in class methods should be treated as message
3077 // sends to the class object in order for the semantic checks to be
3078 // performed correctly. Messages to 'super' already count as class messages,
3079 // so they don't need to be handled here.
3080 if (Receiver && isSelfExpr(Receiver)) {
3081 if (const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>()) {
3082 if (OPT->getObjectType()->isObjCClass()) {
3083 if (const auto *CurMeth = getCurMethodDecl()) {
3084 IsClassObjectCall = true;
3086 Context.getObjCInterfaceType(CurMeth->getClassInterface());
3091 checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs),
3092 ReceiverType, IsClassObjectCall);
3095 if (getLangOpts().ObjCAutoRefCount) {
3096 // In ARC, annotate delegate init calls.
3097 if (Result->getMethodFamily() == OMF_init &&
3098 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
3099 // Only consider init calls *directly* in init implementations,
3100 // not within blocks.
3101 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(CurContext);
3102 if (method && method->getMethodFamily() == OMF_init) {
3103 // The implicit assignment to self means we also don't want to
3104 // consume the result.
3105 Result->setDelegateInitCall(true);
3110 // In ARC, check for message sends which are likely to introduce
3112 checkRetainCycles(Result);
3115 if (getLangOpts().ObjCWeak) {
3116 if (!isImplicit && Method) {
3117 if (const ObjCPropertyDecl *Prop = Method->findPropertyDecl()) {
3119 Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak;
3120 if (!IsWeak && Sel.isUnarySelector())
3121 IsWeak = ReturnType.getObjCLifetime() & Qualifiers::OCL_Weak;
3123 !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, LBracLoc))
3124 getCurFunction()->recordUseOfWeak(Result, Prop);
3129 CheckObjCCircularContainer(Result);
3131 return MaybeBindToTemporary(Result);
3134 static void RemoveSelectorFromWarningCache(Sema &S, Expr* Arg) {
3135 if (ObjCSelectorExpr *OSE =
3136 dyn_cast<ObjCSelectorExpr>(Arg->IgnoreParenCasts())) {
3137 Selector Sel = OSE->getSelector();
3138 SourceLocation Loc = OSE->getAtLoc();
3139 auto Pos = S.ReferencedSelectors.find(Sel);
3140 if (Pos != S.ReferencedSelectors.end() && Pos->second == Loc)
3141 S.ReferencedSelectors.erase(Pos);
3145 // ActOnInstanceMessage - used for both unary and keyword messages.
3146 // ArgExprs is optional - if it is present, the number of expressions
3147 // is obtained from Sel.getNumArgs().
3148 ExprResult Sema::ActOnInstanceMessage(Scope *S,
3151 SourceLocation LBracLoc,
3152 ArrayRef<SourceLocation> SelectorLocs,
3153 SourceLocation RBracLoc,
3154 MultiExprArg Args) {
3158 // A ParenListExpr can show up while doing error recovery with invalid code.
3159 if (isa<ParenListExpr>(Receiver)) {
3160 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Receiver);
3161 if (Result.isInvalid()) return ExprError();
3162 Receiver = Result.get();
3165 if (RespondsToSelectorSel.isNull()) {
3166 IdentifierInfo *SelectorId = &Context.Idents.get("respondsToSelector");
3167 RespondsToSelectorSel = Context.Selectors.getUnarySelector(SelectorId);
3169 if (Sel == RespondsToSelectorSel)
3170 RemoveSelectorFromWarningCache(*this, Args[0]);
3172 return BuildInstanceMessage(Receiver, Receiver->getType(),
3173 /*SuperLoc=*/SourceLocation(), Sel,
3174 /*Method=*/nullptr, LBracLoc, SelectorLocs,
3178 enum ARCConversionTypeClass {
3179 /// int, void, struct A
3185 /// id*, id***, void (^*)(),
3186 ACTC_indirectRetainable,
3188 /// void* might be a normal C type, or it might a CF type.
3195 static bool isAnyRetainable(ARCConversionTypeClass ACTC) {
3196 return (ACTC == ACTC_retainable ||
3197 ACTC == ACTC_coreFoundation ||
3198 ACTC == ACTC_voidPtr);
3201 static bool isAnyCLike(ARCConversionTypeClass ACTC) {
3202 return ACTC == ACTC_none ||
3203 ACTC == ACTC_voidPtr ||
3204 ACTC == ACTC_coreFoundation;
3207 static ARCConversionTypeClass classifyTypeForARCConversion(QualType type) {
3208 bool isIndirect = false;
3210 // Ignore an outermost reference type.
3211 if (const ReferenceType *ref = type->getAs<ReferenceType>()) {
3212 type = ref->getPointeeType();
3216 // Drill through pointers and arrays recursively.
3218 if (const PointerType *ptr = type->getAs<PointerType>()) {
3219 type = ptr->getPointeeType();
3221 // The first level of pointer may be the innermost pointer on a CF type.
3223 if (type->isVoidType()) return ACTC_voidPtr;
3224 if (type->isRecordType()) return ACTC_coreFoundation;
3226 } else if (const ArrayType *array = type->getAsArrayTypeUnsafe()) {
3227 type = QualType(array->getElementType()->getBaseElementTypeUnsafe(), 0);
3235 if (type->isObjCARCBridgableType())
3236 return ACTC_indirectRetainable;
3240 if (type->isObjCARCBridgableType())
3241 return ACTC_retainable;
3247 /// A result from the cast checker.
3249 /// Cannot be casted.
3252 /// Can be safely retained or not retained.
3255 /// Can be casted at +0.
3258 /// Can be casted at +1.
3261 ACCResult merge(ACCResult left, ACCResult right) {
3262 if (left == right) return left;
3263 if (left == ACC_bottom) return right;
3264 if (right == ACC_bottom) return left;
3268 /// A checker which white-lists certain expressions whose conversion
3269 /// to or from retainable type would otherwise be forbidden in ARC.
3270 class ARCCastChecker : public StmtVisitor<ARCCastChecker, ACCResult> {
3271 typedef StmtVisitor<ARCCastChecker, ACCResult> super;
3273 ASTContext &Context;
3274 ARCConversionTypeClass SourceClass;
3275 ARCConversionTypeClass TargetClass;
3278 static bool isCFType(QualType type) {
3279 // Someday this can use ns_bridged. For now, it has to do this.
3280 return type->isCARCBridgableType();
3284 ARCCastChecker(ASTContext &Context, ARCConversionTypeClass source,
3285 ARCConversionTypeClass target, bool diagnose)
3286 : Context(Context), SourceClass(source), TargetClass(target),
3287 Diagnose(diagnose) {}
3290 ACCResult Visit(Expr *e) {
3291 return super::Visit(e->IgnoreParens());
3294 ACCResult VisitStmt(Stmt *s) {
3298 /// Null pointer constants can be casted however you please.
3299 ACCResult VisitExpr(Expr *e) {
3300 if (e->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull))
3305 /// Objective-C string literals can be safely casted.
3306 ACCResult VisitObjCStringLiteral(ObjCStringLiteral *e) {
3307 // If we're casting to any retainable type, go ahead. Global
3308 // strings are immune to retains, so this is bottom.
3309 if (isAnyRetainable(TargetClass)) return ACC_bottom;
3314 /// Look through certain implicit and explicit casts.
3315 ACCResult VisitCastExpr(CastExpr *e) {
3316 switch (e->getCastKind()) {
3317 case CK_NullToPointer:
3321 case CK_LValueToRValue:
3323 case CK_CPointerToObjCPointerCast:
3324 case CK_BlockPointerToObjCPointerCast:
3325 case CK_AnyPointerToBlockPointerCast:
3326 return Visit(e->getSubExpr());
3333 /// Look through unary extension.
3334 ACCResult VisitUnaryExtension(UnaryOperator *e) {
3335 return Visit(e->getSubExpr());
3338 /// Ignore the LHS of a comma operator.
3339 ACCResult VisitBinComma(BinaryOperator *e) {
3340 return Visit(e->getRHS());
3343 /// Conditional operators are okay if both sides are okay.
3344 ACCResult VisitConditionalOperator(ConditionalOperator *e) {
3345 ACCResult left = Visit(e->getTrueExpr());
3346 if (left == ACC_invalid) return ACC_invalid;
3347 return merge(left, Visit(e->getFalseExpr()));
3350 /// Look through pseudo-objects.
3351 ACCResult VisitPseudoObjectExpr(PseudoObjectExpr *e) {
3352 // If we're getting here, we should always have a result.
3353 return Visit(e->getResultExpr());
3356 /// Statement expressions are okay if their result expression is okay.
3357 ACCResult VisitStmtExpr(StmtExpr *e) {
3358 return Visit(e->getSubStmt()->body_back());
3361 /// Some declaration references are okay.
3362 ACCResult VisitDeclRefExpr(DeclRefExpr *e) {
3363 VarDecl *var = dyn_cast<VarDecl>(e->getDecl());
3364 // References to global constants are okay.
3365 if (isAnyRetainable(TargetClass) &&
3366 isAnyRetainable(SourceClass) &&
3368 !var->hasDefinition(Context) &&
3369 var->getType().isConstQualified()) {
3371 // In system headers, they can also be assumed to be immune to retains.
3372 // These are things like 'kCFStringTransformToLatin'.
3373 if (Context.getSourceManager().isInSystemHeader(var->getLocation()))
3376 return ACC_plusZero;
3383 /// Some calls are okay.
3384 ACCResult VisitCallExpr(CallExpr *e) {
3385 if (FunctionDecl *fn = e->getDirectCallee())
3386 if (ACCResult result = checkCallToFunction(fn))
3389 return super::VisitCallExpr(e);
3392 ACCResult checkCallToFunction(FunctionDecl *fn) {
3393 // Require a CF*Ref return type.
3394 if (!isCFType(fn->getReturnType()))
3397 if (!isAnyRetainable(TargetClass))
3400 // Honor an explicit 'not retained' attribute.
3401 if (fn->hasAttr<CFReturnsNotRetainedAttr>())
3402 return ACC_plusZero;
3404 // Honor an explicit 'retained' attribute, except that for
3405 // now we're not going to permit implicit handling of +1 results,
3406 // because it's a bit frightening.
3407 if (fn->hasAttr<CFReturnsRetainedAttr>())
3408 return Diagnose ? ACC_plusOne
3409 : ACC_invalid; // ACC_plusOne if we start accepting this
3411 // Recognize this specific builtin function, which is used by CFSTR.
3412 unsigned builtinID = fn->getBuiltinID();
3413 if (builtinID == Builtin::BI__builtin___CFStringMakeConstantString)
3416 // Otherwise, don't do anything implicit with an unaudited function.
3417 if (!fn->hasAttr<CFAuditedTransferAttr>())
3420 // Otherwise, it's +0 unless it follows the create convention.
3421 if (ento::coreFoundation::followsCreateRule(fn))
3422 return Diagnose ? ACC_plusOne
3423 : ACC_invalid; // ACC_plusOne if we start accepting this
3425 return ACC_plusZero;
3428 ACCResult VisitObjCMessageExpr(ObjCMessageExpr *e) {
3429 return checkCallToMethod(e->getMethodDecl());
3432 ACCResult VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *e) {
3433 ObjCMethodDecl *method;
3434 if (e->isExplicitProperty())
3435 method = e->getExplicitProperty()->getGetterMethodDecl();
3437 method = e->getImplicitPropertyGetter();
3438 return checkCallToMethod(method);
3441 ACCResult checkCallToMethod(ObjCMethodDecl *method) {
3442 if (!method) return ACC_invalid;
3444 // Check for message sends to functions returning CF types. We
3445 // just obey the Cocoa conventions with these, even though the
3446 // return type is CF.
3447 if (!isAnyRetainable(TargetClass) || !isCFType(method->getReturnType()))
3450 // If the method is explicitly marked not-retained, it's +0.
3451 if (method->hasAttr<CFReturnsNotRetainedAttr>())
3452 return ACC_plusZero;
3454 // If the method is explicitly marked as returning retained, or its
3455 // selector follows a +1 Cocoa convention, treat it as +1.
3456 if (method->hasAttr<CFReturnsRetainedAttr>())
3459 switch (method->getSelector().getMethodFamily()) {
3462 case OMF_mutableCopy:
3467 // Otherwise, treat it as +0.
3468 return ACC_plusZero;
3472 } // end anonymous namespace
3474 bool Sema::isKnownName(StringRef name) {
3477 LookupResult R(*this, &Context.Idents.get(name), SourceLocation(),
3478 Sema::LookupOrdinaryName);
3479 return LookupName(R, TUScope, false);
3482 static void addFixitForObjCARCConversion(Sema &S,
3483 DiagnosticBuilder &DiagB,
3484 Sema::CheckedConversionKind CCK,
3485 SourceLocation afterLParen,
3489 const char *bridgeKeyword,
3490 const char *CFBridgeName) {
3491 // We handle C-style and implicit casts here.
3493 case Sema::CCK_ImplicitConversion:
3494 case Sema::CCK_CStyleCast:
3495 case Sema::CCK_OtherCast:
3497 case Sema::CCK_FunctionalCast:
3502 if (CCK == Sema::CCK_OtherCast) {
3503 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3504 SourceRange range(NCE->getOperatorLoc(),
3505 NCE->getAngleBrackets().getEnd());
3506 SmallString<32> BridgeCall;
3508 SourceManager &SM = S.getSourceManager();
3509 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3510 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3513 BridgeCall += CFBridgeName;
3514 DiagB.AddFixItHint(FixItHint::CreateReplacement(range, BridgeCall));
3518 Expr *castedE = castExpr;
3519 if (CStyleCastExpr *CCE = dyn_cast<CStyleCastExpr>(castedE))
3520 castedE = CCE->getSubExpr();
3521 castedE = castedE->IgnoreImpCasts();
3522 SourceRange range = castedE->getSourceRange();
3524 SmallString<32> BridgeCall;
3526 SourceManager &SM = S.getSourceManager();
3527 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3528 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3531 BridgeCall += CFBridgeName;
3533 if (isa<ParenExpr>(castedE)) {
3534 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3538 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3540 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3541 S.getLocForEndOfToken(range.getEnd()),
3547 if (CCK == Sema::CCK_CStyleCast) {
3548 DiagB.AddFixItHint(FixItHint::CreateInsertion(afterLParen, bridgeKeyword));
3549 } else if (CCK == Sema::CCK_OtherCast) {
3550 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3551 std::string castCode = "(";
3552 castCode += bridgeKeyword;
3553 castCode += castType.getAsString();
3555 SourceRange Range(NCE->getOperatorLoc(),
3556 NCE->getAngleBrackets().getEnd());
3557 DiagB.AddFixItHint(FixItHint::CreateReplacement(Range, castCode));
3560 std::string castCode = "(";
3561 castCode += bridgeKeyword;
3562 castCode += castType.getAsString();
3564 Expr *castedE = castExpr->IgnoreImpCasts();
3565 SourceRange range = castedE->getSourceRange();
3566 if (isa<ParenExpr>(castedE)) {
3567 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3571 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3573 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3574 S.getLocForEndOfToken(range.getEnd()),
3580 template <typename T>
3581 static inline T *getObjCBridgeAttr(const TypedefType *TD) {
3582 TypedefNameDecl *TDNDecl = TD->getDecl();
3583 QualType QT = TDNDecl->getUnderlyingType();
3584 if (QT->isPointerType()) {
3585 QT = QT->getPointeeType();
3586 if (const RecordType *RT = QT->getAs<RecordType>())
3587 if (RecordDecl *RD = RT->getDecl()->getMostRecentDecl())
3588 return RD->getAttr<T>();
3593 static ObjCBridgeRelatedAttr *ObjCBridgeRelatedAttrFromType(QualType T,
3594 TypedefNameDecl *&TDNDecl) {
3595 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3596 TDNDecl = TD->getDecl();
3597 if (ObjCBridgeRelatedAttr *ObjCBAttr =
3598 getObjCBridgeAttr<ObjCBridgeRelatedAttr>(TD))
3600 T = TDNDecl->getUnderlyingType();
3606 diagnoseObjCARCConversion(Sema &S, SourceRange castRange,
3607 QualType castType, ARCConversionTypeClass castACTC,
3608 Expr *castExpr, Expr *realCast,
3609 ARCConversionTypeClass exprACTC,
3610 Sema::CheckedConversionKind CCK) {
3611 SourceLocation loc =
3612 (castRange.isValid() ? castRange.getBegin() : castExpr->getExprLoc());
3614 if (S.makeUnavailableInSystemHeader(loc,
3615 UnavailableAttr::IR_ARCForbiddenConversion))
3618 QualType castExprType = castExpr->getType();
3619 // Defer emitting a diagnostic for bridge-related casts; that will be
3620 // handled by CheckObjCBridgeRelatedConversions.
3621 TypedefNameDecl *TDNDecl = nullptr;
3622 if ((castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable &&
3623 ObjCBridgeRelatedAttrFromType(castType, TDNDecl)) ||
3624 (exprACTC == ACTC_coreFoundation && castACTC == ACTC_retainable &&
3625 ObjCBridgeRelatedAttrFromType(castExprType, TDNDecl)))
3628 unsigned srcKind = 0;
3631 case ACTC_coreFoundation:
3633 srcKind = (castExprType->isPointerType() ? 1 : 0);
3635 case ACTC_retainable:
3636 srcKind = (castExprType->isBlockPointerType() ? 2 : 3);
3638 case ACTC_indirectRetainable:
3643 // Check whether this could be fixed with a bridge cast.
3644 SourceLocation afterLParen = S.getLocForEndOfToken(castRange.getBegin());
3645 SourceLocation noteLoc = afterLParen.isValid() ? afterLParen : loc;
3647 // Bridge from an ARC type to a CF type.
3648 if (castACTC == ACTC_retainable && isAnyRetainable(exprACTC)) {
3650 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3651 << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit
3652 << 2 // of C pointer type
3654 << unsigned(castType->isBlockPointerType()) // to ObjC|block type
3657 << castExpr->getSourceRange();
3658 bool br = S.isKnownName("CFBridgingRelease");
3659 ACCResult CreateRule =
3660 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3661 assert(CreateRule != ACC_bottom && "This cast should already be accepted.");
3662 if (CreateRule != ACC_plusOne)
3664 DiagnosticBuilder DiagB =
3665 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3666 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3668 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3669 castType, castExpr, realCast, "__bridge ",
3672 if (CreateRule != ACC_plusZero)
3674 DiagnosticBuilder DiagB =
3675 (CCK == Sema::CCK_OtherCast && !br) ?
3676 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_transfer) << castExprType :
3677 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3678 diag::note_arc_bridge_transfer)
3679 << castExprType << br;
3681 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3682 castType, castExpr, realCast, "__bridge_transfer ",
3683 br ? "CFBridgingRelease" : nullptr);
3689 // Bridge from a CF type to an ARC type.
3690 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC)) {
3691 bool br = S.isKnownName("CFBridgingRetain");
3692 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3693 << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit
3694 << unsigned(castExprType->isBlockPointerType()) // of ObjC|block type
3696 << 2 // to C pointer type
3699 << castExpr->getSourceRange();
3700 ACCResult CreateRule =
3701 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3702 assert(CreateRule != ACC_bottom && "This cast should already be accepted.");
3703 if (CreateRule != ACC_plusOne)
3705 DiagnosticBuilder DiagB =
3706 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3707 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3708 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3709 castType, castExpr, realCast, "__bridge ",
3712 if (CreateRule != ACC_plusZero)
3714 DiagnosticBuilder DiagB =
3715 (CCK == Sema::CCK_OtherCast && !br) ?
3716 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_retained) << castType :
3717 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3718 diag::note_arc_bridge_retained)
3721 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3722 castType, castExpr, realCast, "__bridge_retained ",
3723 br ? "CFBridgingRetain" : nullptr);
3729 S.Diag(loc, diag::err_arc_mismatched_cast)
3730 << (CCK != Sema::CCK_ImplicitConversion)
3731 << srcKind << castExprType << castType
3732 << castRange << castExpr->getSourceRange();
3735 template <typename TB>
3736 static bool CheckObjCBridgeNSCast(Sema &S, QualType castType, Expr *castExpr,
3737 bool &HadTheAttribute, bool warn) {
3738 QualType T = castExpr->getType();
3739 HadTheAttribute = false;
3740 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3741 TypedefNameDecl *TDNDecl = TD->getDecl();
3742 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3743 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3744 HadTheAttribute = true;
3745 if (Parm->isStr("id"))
3748 NamedDecl *Target = nullptr;
3749 // Check for an existing type with this name.
3750 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3751 Sema::LookupOrdinaryName);
3752 if (S.LookupName(R, S.TUScope)) {
3753 Target = R.getFoundDecl();
3754 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3755 ObjCInterfaceDecl *ExprClass = cast<ObjCInterfaceDecl>(Target);
3756 if (const ObjCObjectPointerType *InterfacePointerType =
3757 castType->getAsObjCInterfacePointerType()) {
3758 ObjCInterfaceDecl *CastClass
3759 = InterfacePointerType->getObjectType()->getInterface();
3760 if ((CastClass == ExprClass) ||
3761 (CastClass && CastClass->isSuperClassOf(ExprClass)))
3764 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge)
3765 << T << Target->getName() << castType->getPointeeType();
3767 } else if (castType->isObjCIdType() ||
3768 (S.Context.ObjCObjectAdoptsQTypeProtocols(
3769 castType, ExprClass)))
3770 // ok to cast to 'id'.
3771 // casting to id<p-list> is ok if bridge type adopts all of
3772 // p-list protocols.
3776 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge)
3777 << T << Target->getName() << castType;
3778 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3779 S.Diag(Target->getLocStart(), diag::note_declared_at);
3784 } else if (!castType->isObjCIdType()) {
3785 S.Diag(castExpr->getLocStart(), diag::err_objc_cf_bridged_not_interface)
3786 << castExpr->getType() << Parm;
3787 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3789 S.Diag(Target->getLocStart(), diag::note_declared_at);
3795 T = TDNDecl->getUnderlyingType();
3800 template <typename TB>
3801 static bool CheckObjCBridgeCFCast(Sema &S, QualType castType, Expr *castExpr,
3802 bool &HadTheAttribute, bool warn) {
3803 QualType T = castType;
3804 HadTheAttribute = false;
3805 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3806 TypedefNameDecl *TDNDecl = TD->getDecl();
3807 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3808 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3809 HadTheAttribute = true;
3810 if (Parm->isStr("id"))
3813 NamedDecl *Target = nullptr;
3814 // Check for an existing type with this name.
3815 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3816 Sema::LookupOrdinaryName);
3817 if (S.LookupName(R, S.TUScope)) {
3818 Target = R.getFoundDecl();
3819 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3820 ObjCInterfaceDecl *CastClass = cast<ObjCInterfaceDecl>(Target);
3821 if (const ObjCObjectPointerType *InterfacePointerType =
3822 castExpr->getType()->getAsObjCInterfacePointerType()) {
3823 ObjCInterfaceDecl *ExprClass
3824 = InterfacePointerType->getObjectType()->getInterface();
3825 if ((CastClass == ExprClass) ||
3826 (ExprClass && CastClass->isSuperClassOf(ExprClass)))
3829 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge_to_cf)
3830 << castExpr->getType()->getPointeeType() << T;
3831 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3834 } else if (castExpr->getType()->isObjCIdType() ||
3835 (S.Context.QIdProtocolsAdoptObjCObjectProtocols(
3836 castExpr->getType(), CastClass)))
3837 // ok to cast an 'id' expression to a CFtype.
3838 // ok to cast an 'id<plist>' expression to CFtype provided plist
3839 // adopts all of CFtype's ObjetiveC's class plist.
3843 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge_to_cf)
3844 << castExpr->getType() << castType;
3845 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3846 S.Diag(Target->getLocStart(), diag::note_declared_at);
3852 S.Diag(castExpr->getLocStart(), diag::err_objc_ns_bridged_invalid_cfobject)
3853 << castExpr->getType() << castType;
3854 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3856 S.Diag(Target->getLocStart(), diag::note_declared_at);
3861 T = TDNDecl->getUnderlyingType();
3866 void Sema::CheckTollFreeBridgeCast(QualType castType, Expr *castExpr) {
3867 if (!getLangOpts().ObjC1)
3869 // warn in presence of __bridge casting to or from a toll free bridge cast.
3870 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExpr->getType());
3871 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
3872 if (castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) {
3873 bool HasObjCBridgeAttr;
3874 bool ObjCBridgeAttrWillNotWarn =
3875 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3877 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3879 bool HasObjCBridgeMutableAttr;
3880 bool ObjCBridgeMutableAttrWillNotWarn =
3881 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3882 HasObjCBridgeMutableAttr, false);
3883 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3886 if (HasObjCBridgeAttr)
3887 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3889 else if (HasObjCBridgeMutableAttr)
3890 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3891 HasObjCBridgeMutableAttr, true);
3893 else if (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable) {
3894 bool HasObjCBridgeAttr;
3895 bool ObjCBridgeAttrWillNotWarn =
3896 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3898 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3900 bool HasObjCBridgeMutableAttr;
3901 bool ObjCBridgeMutableAttrWillNotWarn =
3902 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3903 HasObjCBridgeMutableAttr, false);
3904 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3907 if (HasObjCBridgeAttr)
3908 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3910 else if (HasObjCBridgeMutableAttr)
3911 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3912 HasObjCBridgeMutableAttr, true);
3916 void Sema::CheckObjCBridgeRelatedCast(QualType castType, Expr *castExpr) {
3917 QualType SrcType = castExpr->getType();
3918 if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(castExpr)) {
3919 if (PRE->isExplicitProperty()) {
3920 if (ObjCPropertyDecl *PDecl = PRE->getExplicitProperty())
3921 SrcType = PDecl->getType();
3923 else if (PRE->isImplicitProperty()) {
3924 if (ObjCMethodDecl *Getter = PRE->getImplicitPropertyGetter())
3925 SrcType = Getter->getReturnType();
3929 ARCConversionTypeClass srcExprACTC = classifyTypeForARCConversion(SrcType);
3930 ARCConversionTypeClass castExprACTC = classifyTypeForARCConversion(castType);
3931 if (srcExprACTC != ACTC_retainable || castExprACTC != ACTC_coreFoundation)
3933 CheckObjCBridgeRelatedConversions(castExpr->getLocStart(),
3934 castType, SrcType, castExpr);
3937 bool Sema::CheckTollFreeBridgeStaticCast(QualType castType, Expr *castExpr,
3939 if (!getLangOpts().ObjC1)
3941 ARCConversionTypeClass exprACTC =
3942 classifyTypeForARCConversion(castExpr->getType());
3943 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
3944 if ((castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) ||
3945 (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable)) {
3946 CheckTollFreeBridgeCast(castType, castExpr);
3947 Kind = (castACTC == ACTC_coreFoundation) ? CK_BitCast
3948 : CK_CPointerToObjCPointerCast;
3954 bool Sema::checkObjCBridgeRelatedComponents(SourceLocation Loc,
3955 QualType DestType, QualType SrcType,
3956 ObjCInterfaceDecl *&RelatedClass,
3957 ObjCMethodDecl *&ClassMethod,
3958 ObjCMethodDecl *&InstanceMethod,
3959 TypedefNameDecl *&TDNDecl,
3960 bool CfToNs, bool Diagnose) {
3961 QualType T = CfToNs ? SrcType : DestType;
3962 ObjCBridgeRelatedAttr *ObjCBAttr = ObjCBridgeRelatedAttrFromType(T, TDNDecl);
3966 IdentifierInfo *RCId = ObjCBAttr->getRelatedClass();
3967 IdentifierInfo *CMId = ObjCBAttr->getClassMethod();
3968 IdentifierInfo *IMId = ObjCBAttr->getInstanceMethod();
3971 NamedDecl *Target = nullptr;
3972 // Check for an existing type with this name.
3973 LookupResult R(*this, DeclarationName(RCId), SourceLocation(),
3974 Sema::LookupOrdinaryName);
3975 if (!LookupName(R, TUScope)) {
3977 Diag(Loc, diag::err_objc_bridged_related_invalid_class) << RCId
3978 << SrcType << DestType;
3979 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3983 Target = R.getFoundDecl();
3984 if (Target && isa<ObjCInterfaceDecl>(Target))
3985 RelatedClass = cast<ObjCInterfaceDecl>(Target);
3988 Diag(Loc, diag::err_objc_bridged_related_invalid_class_name) << RCId
3989 << SrcType << DestType;
3990 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3992 Diag(Target->getLocStart(), diag::note_declared_at);
3997 // Check for an existing class method with the given selector name.
3998 if (CfToNs && CMId) {
3999 Selector Sel = Context.Selectors.getUnarySelector(CMId);
4000 ClassMethod = RelatedClass->lookupMethod(Sel, false);
4003 Diag(Loc, diag::err_objc_bridged_related_known_method)
4004 << SrcType << DestType << Sel << false;
4005 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
4011 // Check for an existing instance method with the given selector name.
4012 if (!CfToNs && IMId) {
4013 Selector Sel = Context.Selectors.getNullarySelector(IMId);
4014 InstanceMethod = RelatedClass->lookupMethod(Sel, true);
4015 if (!InstanceMethod) {
4017 Diag(Loc, diag::err_objc_bridged_related_known_method)
4018 << SrcType << DestType << Sel << true;
4019 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
4028 Sema::CheckObjCBridgeRelatedConversions(SourceLocation Loc,
4029 QualType DestType, QualType SrcType,
4030 Expr *&SrcExpr, bool Diagnose) {
4031 ARCConversionTypeClass rhsExprACTC = classifyTypeForARCConversion(SrcType);
4032 ARCConversionTypeClass lhsExprACTC = classifyTypeForARCConversion(DestType);
4033 bool CfToNs = (rhsExprACTC == ACTC_coreFoundation && lhsExprACTC == ACTC_retainable);
4034 bool NsToCf = (rhsExprACTC == ACTC_retainable && lhsExprACTC == ACTC_coreFoundation);
4035 if (!CfToNs && !NsToCf)
4038 ObjCInterfaceDecl *RelatedClass;
4039 ObjCMethodDecl *ClassMethod = nullptr;
4040 ObjCMethodDecl *InstanceMethod = nullptr;
4041 TypedefNameDecl *TDNDecl = nullptr;
4042 if (!checkObjCBridgeRelatedComponents(Loc, DestType, SrcType, RelatedClass,
4043 ClassMethod, InstanceMethod, TDNDecl,
4048 // Implicit conversion from CF to ObjC object is needed.
4051 std::string ExpressionString = "[";
4052 ExpressionString += RelatedClass->getNameAsString();
4053 ExpressionString += " ";
4054 ExpressionString += ClassMethod->getSelector().getAsString();
4055 SourceLocation SrcExprEndLoc = getLocForEndOfToken(SrcExpr->getLocEnd());
4056 // Provide a fixit: [RelatedClass ClassMethod SrcExpr]
4057 Diag(Loc, diag::err_objc_bridged_related_known_method)
4058 << SrcType << DestType << ClassMethod->getSelector() << false
4059 << FixItHint::CreateInsertion(SrcExpr->getLocStart(), ExpressionString)
4060 << FixItHint::CreateInsertion(SrcExprEndLoc, "]");
4061 Diag(RelatedClass->getLocStart(), diag::note_declared_at);
4062 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
4064 QualType receiverType = Context.getObjCInterfaceType(RelatedClass);
4066 Expr *args[] = { SrcExpr };
4067 ExprResult msg = BuildClassMessageImplicit(receiverType, false,
4068 ClassMethod->getLocation(),
4069 ClassMethod->getSelector(), ClassMethod,
4070 MultiExprArg(args, 1));
4071 SrcExpr = msg.get();
4077 // Implicit conversion from ObjC type to CF object is needed.
4078 if (InstanceMethod) {
4080 std::string ExpressionString;
4081 SourceLocation SrcExprEndLoc =
4082 getLocForEndOfToken(SrcExpr->getLocEnd());
4083 if (InstanceMethod->isPropertyAccessor())
4084 if (const ObjCPropertyDecl *PDecl =
4085 InstanceMethod->findPropertyDecl()) {
4086 // fixit: ObjectExpr.propertyname when it is aproperty accessor.
4087 ExpressionString = ".";
4088 ExpressionString += PDecl->getNameAsString();
4089 Diag(Loc, diag::err_objc_bridged_related_known_method)
4090 << SrcType << DestType << InstanceMethod->getSelector() << true
4091 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
4093 if (ExpressionString.empty()) {
4094 // Provide a fixit: [ObjectExpr InstanceMethod]
4095 ExpressionString = " ";
4096 ExpressionString += InstanceMethod->getSelector().getAsString();
4097 ExpressionString += "]";
4099 Diag(Loc, diag::err_objc_bridged_related_known_method)
4100 << SrcType << DestType << InstanceMethod->getSelector() << true
4101 << FixItHint::CreateInsertion(SrcExpr->getLocStart(), "[")
4102 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
4104 Diag(RelatedClass->getLocStart(), diag::note_declared_at);
4105 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
4108 BuildInstanceMessageImplicit(SrcExpr, SrcType,
4109 InstanceMethod->getLocation(),
4110 InstanceMethod->getSelector(),
4111 InstanceMethod, None);
4112 SrcExpr = msg.get();
4120 Sema::ARCConversionResult
4121 Sema::CheckObjCConversion(SourceRange castRange, QualType castType,
4122 Expr *&castExpr, CheckedConversionKind CCK,
4123 bool Diagnose, bool DiagnoseCFAudited,
4124 BinaryOperatorKind Opc) {
4125 QualType castExprType = castExpr->getType();
4127 // For the purposes of the classification, we assume reference types
4128 // will bind to temporaries.
4129 QualType effCastType = castType;
4130 if (const ReferenceType *ref = castType->getAs<ReferenceType>())
4131 effCastType = ref->getPointeeType();
4133 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExprType);
4134 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(effCastType);
4135 if (exprACTC == castACTC) {
4136 // Check for viability and report error if casting an rvalue to a
4137 // life-time qualifier.
4138 if (castACTC == ACTC_retainable &&
4139 (CCK == CCK_CStyleCast || CCK == CCK_OtherCast) &&
4140 castType != castExprType) {
4141 const Type *DT = castType.getTypePtr();
4142 QualType QDT = castType;
4143 // We desugar some types but not others. We ignore those
4144 // that cannot happen in a cast; i.e. auto, and those which
4145 // should not be de-sugared; i.e typedef.
4146 if (const ParenType *PT = dyn_cast<ParenType>(DT))
4147 QDT = PT->desugar();
4148 else if (const TypeOfType *TP = dyn_cast<TypeOfType>(DT))
4149 QDT = TP->desugar();
4150 else if (const AttributedType *AT = dyn_cast<AttributedType>(DT))
4151 QDT = AT->desugar();
4152 if (QDT != castType &&
4153 QDT.getObjCLifetime() != Qualifiers::OCL_None) {
4155 SourceLocation loc = (castRange.isValid() ? castRange.getBegin()
4156 : castExpr->getExprLoc());
4157 Diag(loc, diag::err_arc_nolifetime_behavior);
4165 // The life-time qualifier cast check above is all we need for ObjCWeak.
4166 // ObjCAutoRefCount has more restrictions on what is legal.
4167 if (!getLangOpts().ObjCAutoRefCount)
4170 if (isAnyCLike(exprACTC) && isAnyCLike(castACTC)) return ACR_okay;
4172 // Allow all of these types to be cast to integer types (but not
4174 if (castACTC == ACTC_none && castType->isIntegralType(Context))
4177 // Allow casts between pointers to lifetime types (e.g., __strong id*)
4178 // and pointers to void (e.g., cv void *). Casting from void* to lifetime*
4179 // must be explicit.
4180 if (exprACTC == ACTC_indirectRetainable && castACTC == ACTC_voidPtr)
4182 if (castACTC == ACTC_indirectRetainable && exprACTC == ACTC_voidPtr &&
4183 CCK != CCK_ImplicitConversion)
4186 switch (ARCCastChecker(Context, exprACTC, castACTC, false).Visit(castExpr)) {
4187 // For invalid casts, fall through.
4191 // Do nothing for both bottom and +0.
4196 // If the result is +1, consume it here.
4198 castExpr = ImplicitCastExpr::Create(Context, castExpr->getType(),
4199 CK_ARCConsumeObject, castExpr,
4200 nullptr, VK_RValue);
4201 Cleanup.setExprNeedsCleanups(true);
4205 // If this is a non-implicit cast from id or block type to a
4206 // CoreFoundation type, delay complaining in case the cast is used
4207 // in an acceptable context.
4208 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC) &&
4209 CCK != CCK_ImplicitConversion)
4210 return ACR_unbridged;
4212 // Issue a diagnostic about a missing @-sign when implicit casting a cstring
4213 // to 'NSString *', instead of falling through to report a "bridge cast"
4215 if (castACTC == ACTC_retainable && exprACTC == ACTC_none &&
4216 ConversionToObjCStringLiteralCheck(castType, castExpr, Diagnose))
4219 // Do not issue "bridge cast" diagnostic when implicit casting
4220 // a retainable object to a CF type parameter belonging to an audited
4221 // CF API function. Let caller issue a normal type mismatched diagnostic
4223 if ((!DiagnoseCFAudited || exprACTC != ACTC_retainable ||
4224 castACTC != ACTC_coreFoundation) &&
4225 !(exprACTC == ACTC_voidPtr && castACTC == ACTC_retainable &&
4226 (Opc == BO_NE || Opc == BO_EQ))) {
4228 diagnoseObjCARCConversion(*this, castRange, castType, castACTC, castExpr,
4229 castExpr, exprACTC, CCK);
4235 /// Given that we saw an expression with the ARCUnbridgedCastTy
4236 /// placeholder type, complain bitterly.
4237 void Sema::diagnoseARCUnbridgedCast(Expr *e) {
4238 // We expect the spurious ImplicitCastExpr to already have been stripped.
4239 assert(!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast));
4240 CastExpr *realCast = cast<CastExpr>(e->IgnoreParens());
4242 SourceRange castRange;
4244 CheckedConversionKind CCK;
4246 if (CStyleCastExpr *cast = dyn_cast<CStyleCastExpr>(realCast)) {
4247 castRange = SourceRange(cast->getLParenLoc(), cast->getRParenLoc());
4248 castType = cast->getTypeAsWritten();
4249 CCK = CCK_CStyleCast;
4250 } else if (ExplicitCastExpr *cast = dyn_cast<ExplicitCastExpr>(realCast)) {
4251 castRange = cast->getTypeInfoAsWritten()->getTypeLoc().getSourceRange();
4252 castType = cast->getTypeAsWritten();
4253 CCK = CCK_OtherCast;
4255 llvm_unreachable("Unexpected ImplicitCastExpr");
4258 ARCConversionTypeClass castACTC =
4259 classifyTypeForARCConversion(castType.getNonReferenceType());
4261 Expr *castExpr = realCast->getSubExpr();
4262 assert(classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable);
4264 diagnoseObjCARCConversion(*this, castRange, castType, castACTC,
4265 castExpr, realCast, ACTC_retainable, CCK);
4268 /// stripARCUnbridgedCast - Given an expression of ARCUnbridgedCast
4269 /// type, remove the placeholder cast.
4270 Expr *Sema::stripARCUnbridgedCast(Expr *e) {
4271 assert(e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast));
4273 if (ParenExpr *pe = dyn_cast<ParenExpr>(e)) {
4274 Expr *sub = stripARCUnbridgedCast(pe->getSubExpr());
4275 return new (Context) ParenExpr(pe->getLParen(), pe->getRParen(), sub);
4276 } else if (UnaryOperator *uo = dyn_cast<UnaryOperator>(e)) {
4277 assert(uo->getOpcode() == UO_Extension);
4278 Expr *sub = stripARCUnbridgedCast(uo->getSubExpr());
4279 return new (Context) UnaryOperator(sub, UO_Extension, sub->getType(),
4280 sub->getValueKind(), sub->getObjectKind(),
4281 uo->getOperatorLoc());
4282 } else if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) {
4283 assert(!gse->isResultDependent());
4285 unsigned n = gse->getNumAssocs();
4286 SmallVector<Expr*, 4> subExprs(n);
4287 SmallVector<TypeSourceInfo*, 4> subTypes(n);
4288 for (unsigned i = 0; i != n; ++i) {
4289 subTypes[i] = gse->getAssocTypeSourceInfo(i);
4290 Expr *sub = gse->getAssocExpr(i);
4291 if (i == gse->getResultIndex())
4292 sub = stripARCUnbridgedCast(sub);
4296 return new (Context) GenericSelectionExpr(Context, gse->getGenericLoc(),
4297 gse->getControllingExpr(),
4299 gse->getDefaultLoc(),
4300 gse->getRParenLoc(),
4301 gse->containsUnexpandedParameterPack(),
4302 gse->getResultIndex());
4304 assert(isa<ImplicitCastExpr>(e) && "bad form of unbridged cast!");
4305 return cast<ImplicitCastExpr>(e)->getSubExpr();
4309 bool Sema::CheckObjCARCUnavailableWeakConversion(QualType castType,
4310 QualType exprType) {
4311 QualType canCastType =
4312 Context.getCanonicalType(castType).getUnqualifiedType();
4313 QualType canExprType =
4314 Context.getCanonicalType(exprType).getUnqualifiedType();
4315 if (isa<ObjCObjectPointerType>(canCastType) &&
4316 castType.getObjCLifetime() == Qualifiers::OCL_Weak &&
4317 canExprType->isObjCObjectPointerType()) {
4318 if (const ObjCObjectPointerType *ObjT =
4319 canExprType->getAs<ObjCObjectPointerType>())
4320 if (const ObjCInterfaceDecl *ObjI = ObjT->getInterfaceDecl())
4321 return !ObjI->isArcWeakrefUnavailable();
4326 /// Look for an ObjCReclaimReturnedObject cast and destroy it.
4327 static Expr *maybeUndoReclaimObject(Expr *e) {
4328 Expr *curExpr = e, *prevExpr = nullptr;
4330 // Walk down the expression until we hit an implicit cast of kind
4331 // ARCReclaimReturnedObject or an Expr that is neither a Paren nor a Cast.
4333 if (auto *pe = dyn_cast<ParenExpr>(curExpr)) {
4335 curExpr = pe->getSubExpr();
4339 if (auto *ce = dyn_cast<CastExpr>(curExpr)) {
4340 if (auto *ice = dyn_cast<ImplicitCastExpr>(ce))
4341 if (ice->getCastKind() == CK_ARCReclaimReturnedObject) {
4343 return ice->getSubExpr();
4344 if (auto *pe = dyn_cast<ParenExpr>(prevExpr))
4345 pe->setSubExpr(ice->getSubExpr());
4347 cast<CastExpr>(prevExpr)->setSubExpr(ice->getSubExpr());
4352 curExpr = ce->getSubExpr();
4356 // Break out of the loop if curExpr is neither a Paren nor a Cast.
4363 ExprResult Sema::BuildObjCBridgedCast(SourceLocation LParenLoc,
4364 ObjCBridgeCastKind Kind,
4365 SourceLocation BridgeKeywordLoc,
4366 TypeSourceInfo *TSInfo,
4368 ExprResult SubResult = UsualUnaryConversions(SubExpr);
4369 if (SubResult.isInvalid()) return ExprError();
4370 SubExpr = SubResult.get();
4372 QualType T = TSInfo->getType();
4373 QualType FromType = SubExpr->getType();
4377 bool MustConsume = false;
4378 if (T->isDependentType() || SubExpr->isTypeDependent()) {
4379 // Okay: we'll build a dependent expression type.
4381 } else if (T->isObjCARCBridgableType() && FromType->isCARCBridgableType()) {
4383 CK = (T->isBlockPointerType() ? CK_AnyPointerToBlockPointerCast
4384 : CK_CPointerToObjCPointerCast);
4389 case OBC_BridgeRetained: {
4390 bool br = isKnownName("CFBridgingRelease");
4391 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4394 << (T->isBlockPointerType()? 1 : 0)
4396 << SubExpr->getSourceRange()
4398 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4399 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge");
4400 Diag(BridgeKeywordLoc, diag::note_arc_bridge_transfer)
4402 << FixItHint::CreateReplacement(BridgeKeywordLoc,
4403 br ? "CFBridgingRelease "
4404 : "__bridge_transfer ");
4410 case OBC_BridgeTransfer:
4411 // We must consume the Objective-C object produced by the cast.
4415 } else if (T->isCARCBridgableType() && FromType->isObjCARCBridgableType()) {
4420 // Reclaiming a value that's going to be __bridge-casted to CF
4421 // is very dangerous, so we don't do it.
4422 SubExpr = maybeUndoReclaimObject(SubExpr);
4425 case OBC_BridgeRetained:
4426 // Produce the object before casting it.
4427 SubExpr = ImplicitCastExpr::Create(Context, FromType,
4428 CK_ARCProduceObject,
4429 SubExpr, nullptr, VK_RValue);
4432 case OBC_BridgeTransfer: {
4433 bool br = isKnownName("CFBridgingRetain");
4434 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4435 << (FromType->isBlockPointerType()? 1 : 0)
4439 << SubExpr->getSourceRange()
4442 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4443 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge ");
4444 Diag(BridgeKeywordLoc, diag::note_arc_bridge_retained)
4446 << FixItHint::CreateReplacement(BridgeKeywordLoc,
4447 br ? "CFBridgingRetain " : "__bridge_retained");
4454 Diag(LParenLoc, diag::err_arc_bridge_cast_incompatible)
4455 << FromType << T << Kind
4456 << SubExpr->getSourceRange()
4457 << TSInfo->getTypeLoc().getSourceRange();
4461 Expr *Result = new (Context) ObjCBridgedCastExpr(LParenLoc, Kind, CK,
4466 Cleanup.setExprNeedsCleanups(true);
4467 Result = ImplicitCastExpr::Create(Context, T, CK_ARCConsumeObject, Result,
4468 nullptr, VK_RValue);
4474 ExprResult Sema::ActOnObjCBridgedCast(Scope *S,
4475 SourceLocation LParenLoc,
4476 ObjCBridgeCastKind Kind,
4477 SourceLocation BridgeKeywordLoc,
4479 SourceLocation RParenLoc,
4481 TypeSourceInfo *TSInfo = nullptr;
4482 QualType T = GetTypeFromParser(Type, &TSInfo);
4483 if (Kind == OBC_Bridge)
4484 CheckTollFreeBridgeCast(T, SubExpr);
4486 TSInfo = Context.getTrivialTypeSourceInfo(T, LParenLoc);
4487 return BuildObjCBridgedCast(LParenLoc, Kind, BridgeKeywordLoc, TSInfo,