1 //===--- SemaExprObjC.cpp - Semantic Analysis for ObjC Expressions --------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements semantic analysis for Objective-C expressions.
11 //
12 //===----------------------------------------------------------------------===//
13
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"
29
30 using namespace clang;
31 using namespace sema;
32 using llvm::makeArrayRef;
33
ParseObjCStringLiteral(SourceLocation * AtLocs,ArrayRef<Expr * > Strings)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]);
41
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;
47
48 for (Expr *E : Strings) {
49 S = cast<StringLiteral>(E);
50
51 // ObjC strings can't be wide or UTF.
52 if (!S->isAscii()) {
53 Diag(S->getLocStart(), diag::err_cfstring_literal_not_string_constant)
54 << S->getSourceRange();
55 return true;
56 }
57
58 // Append the string.
59 StrBuf += S->getString();
60
61 // Get the locations of the string tokens.
62 StrLocs.append(S->tokloc_begin(), S->tokloc_end());
63 }
64
65 // Create the aggregate string with the appropriate content and location
66 // information.
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],
74 StrLocs.size());
75 }
76
77 return BuildObjCStringLiteral(AtLocs[0], S);
78 }
79
BuildObjCStringLiteral(SourceLocation AtLoc,StringLiteral * S)80 ExprResult Sema::BuildObjCStringLiteral(SourceLocation AtLoc, StringLiteral *S){
81 // Verify that this composite string is acceptable for ObjC strings.
82 if (CheckObjCString(S))
83 return true;
84
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();
90 if (!Ty.isNull()) {
91 Ty = Context.getObjCObjectPointerType(Ty);
92 } else if (getLangOpts().NoConstantCFStrings) {
93 IdentifierInfo *NSIdent=nullptr;
94 std::string StringClass(getLangOpts().ObjCConstantStringClass);
95
96 if (StringClass.empty())
97 NSIdent = &Context.Idents.get("NSConstantString");
98 else
99 NSIdent = &Context.Idents.get(StringClass);
100
101 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
102 LookupOrdinaryName);
103 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
104 Context.setObjCConstantStringInterface(StrIF);
105 Ty = Context.getObjCConstantStringInterface();
106 Ty = Context.getObjCObjectPointerType(Ty);
107 } else {
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();
113 }
114 } else {
115 IdentifierInfo *NSIdent = NSAPIObj->getNSClassId(NSAPI::ClassId_NSString);
116 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
117 LookupOrdinaryName);
118 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
119 Context.setObjCConstantStringInterface(StrIF);
120 Ty = Context.getObjCConstantStringInterface();
121 Ty = Context.getObjCObjectPointerType(Ty);
122 } else {
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();
128 if (Ty.isNull()) {
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);
136 }
137 Ty = Context.getObjCObjectPointerType(Ty);
138 }
139 }
140
141 return new (Context) ObjCStringLiteral(S, Ty, AtLoc);
142 }
143
144 /// \brief Emits an error if the given method does not exist, or if the return
145 /// type is not an Objective-C object.
validateBoxingMethod(Sema & S,SourceLocation Loc,const ObjCInterfaceDecl * Class,Selector Sel,const ObjCMethodDecl * Method)146 static bool validateBoxingMethod(Sema &S, SourceLocation Loc,
147 const ObjCInterfaceDecl *Class,
148 Selector Sel, const ObjCMethodDecl *Method) {
149 if (!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();
152 return false;
153 }
154
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)
159 << Sel;
160 S.Diag(Method->getLocation(), diag::note_objc_literal_method_return)
161 << ReturnType;
162 return false;
163 }
164
165 return true;
166 }
167
168 /// \brief Maps ObjCLiteralKind to NSClassIdKindKind
ClassKindFromLiteralKind(Sema::ObjCLiteralKind LiteralKind)169 static NSAPI::NSClassIdKindKind ClassKindFromLiteralKind(
170 Sema::ObjCLiteralKind LiteralKind) {
171 switch (LiteralKind) {
172 case Sema::LK_Array:
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;
180 case Sema::LK_Boxed:
181 return NSAPI::ClassId_NSValue;
182
183 // there is no corresponding matching
184 // between LK_None/LK_Block and NSClassIdKindKind
185 case Sema::LK_Block:
186 case Sema::LK_None:
187 break;
188 }
189 llvm_unreachable("LiteralKind can't be converted into a ClassKind");
190 }
191
192 /// \brief Validates ObjCInterfaceDecl availability.
193 /// ObjCInterfaceDecl, used to create ObjC literals, should be defined
194 /// if clang not in a debugger mode.
ValidateObjCLiteralInterfaceDecl(Sema & S,ObjCInterfaceDecl * Decl,SourceLocation Loc,Sema::ObjCLiteralKind LiteralKind)195 static bool ValidateObjCLiteralInterfaceDecl(Sema &S, ObjCInterfaceDecl *Decl,
196 SourceLocation Loc,
197 Sema::ObjCLiteralKind LiteralKind) {
198 if (!Decl) {
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;
203 return false;
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);
208 return false;
209 }
210
211 return true;
212 }
213
214 /// \brief Looks up ObjCInterfaceDecl of a given NSClassIdKindKind.
215 /// Used to create ObjC literals, such as NSDictionary (@{}),
216 /// NSArray (@[]) and Boxed Expressions (@())
LookupObjCInterfaceDeclForLiteral(Sema & S,SourceLocation Loc,Sema::ObjCLiteralKind LiteralKind)217 static ObjCInterfaceDecl *LookupObjCInterfaceDeclForLiteral(Sema &S,
218 SourceLocation Loc,
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());
230 }
231
232 if (!ValidateObjCLiteralInterfaceDecl(S, ID, Loc, LiteralKind)) {
233 ID = nullptr;
234 }
235
236 return ID;
237 }
238
239 /// \brief Retrieve the NSNumber factory method that should be used to create
240 /// an Objective-C literal for the given type.
getNSNumberFactoryMethod(Sema & S,SourceLocation Loc,QualType NumberType,bool isLiteral=false,SourceRange R=SourceRange ())241 static ObjCMethodDecl *getNSNumberFactoryMethod(Sema &S, SourceLocation Loc,
242 QualType NumberType,
243 bool isLiteral = false,
244 SourceRange R = SourceRange()) {
245 Optional<NSAPI::NSNumberLiteralMethodKind> Kind =
246 S.NSAPIObj->getNSNumberFactoryMethodKind(NumberType);
247
248 if (!Kind) {
249 if (isLiteral) {
250 S.Diag(Loc, diag::err_invalid_nsnumber_type)
251 << NumberType << R;
252 }
253 return nullptr;
254 }
255
256 // If we already looked up this method, we're done.
257 if (S.NSNumberLiteralMethods[*Kind])
258 return S.NSNumberLiteralMethods[*Kind];
259
260 Selector Sel = S.NSAPIObj->getNSNumberLiteralSelector(*Kind,
261 /*Instance=*/false);
262
263 ASTContext &CX = S.Context;
264
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,
269 Sema::LK_Numeric);
270 if (!S.NSNumberDecl) {
271 return nullptr;
272 }
273 }
274
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);
279 }
280
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;
286 Method =
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,
298 SC_None, nullptr);
299 Method->setMethodParams(S.Context, value, None);
300 }
301
302 if (!validateBoxingMethod(S, Loc, S.NSNumberDecl, Sel, Method))
303 return nullptr;
304
305 // Note: if the parameter type is out-of-line, we'll catch it later in the
306 // implicit conversion.
307
308 S.NSNumberLiteralMethods[*Kind] = Method;
309 return Method;
310 }
311
312 /// BuildObjCNumericLiteral - builds an ObjCBoxedExpr AST node for the
313 /// numeric literal expression. Type of the expression will be "NSNumber *".
BuildObjCNumericLiteral(SourceLocation AtLoc,Expr * Number)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;
324 break;
325
326 case CharacterLiteral::Wide:
327 NumberType = Context.getWideCharType();
328 break;
329
330 case CharacterLiteral::UTF16:
331 NumberType = Context.Char16Ty;
332 break;
333
334 case CharacterLiteral::UTF32:
335 NumberType = Context.Char32Ty;
336 break;
337 }
338 }
339
340 // Look for the appropriate method within NSNumber.
341 // Construct the literal.
342 SourceRange NR(Number->getSourceRange());
343 ObjCMethodDecl *Method = getNSNumberFactoryMethod(*this, AtLoc, NumberType,
344 true, NR);
345 if (!Method)
346 return ExprError();
347
348 // Convert the number to the type that the parameter expects.
349 ParmVarDecl *ParamDecl = Method->parameters()[0];
350 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
351 ParamDecl);
352 ExprResult ConvertedNumber = PerformCopyInitialization(Entity,
353 SourceLocation(),
354 Number);
355 if (ConvertedNumber.isInvalid())
356 return ExprError();
357 Number = ConvertedNumber.get();
358
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())));
363 }
364
ActOnObjCBoolLiteral(SourceLocation AtLoc,SourceLocation ValueLoc,bool Value)365 ExprResult Sema::ActOnObjCBoolLiteral(SourceLocation AtLoc,
366 SourceLocation ValueLoc,
367 bool Value) {
368 ExprResult Inner;
369 if (getLangOpts().CPlusPlus) {
370 Inner = ActOnCXXBoolLiteral(ValueLoc, Value? tok::kw_true : tok::kw_false);
371 } else {
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);
377 }
378
379 return BuildObjCNumericLiteral(AtLoc, Inner.get());
380 }
381
382 /// \brief Check that the given expression is a valid element of an Objective-C
383 /// collection literal.
CheckObjCCollectionLiteralElement(Sema & S,Expr * Element,QualType T,bool ArrayLiteral=false)384 static ExprResult CheckObjCCollectionLiteralElement(Sema &S, Expr *Element,
385 QualType T,
386 bool ArrayLiteral = false) {
387 // If the expression is type-dependent, there's nothing for us to do.
388 if (Element->isTypeDependent())
389 return Element;
390
391 ExprResult Result = S.CheckPlaceholderExpr(Element);
392 if (Result.isInvalid())
393 return ExprError();
394 Element = Result.get();
395
396 // In C++, check for an implicit conversion to an Objective-C object pointer
397 // type.
398 if (S.getLangOpts().CPlusPlus && Element->getType()->isRecordType()) {
399 InitializedEntity Entity
400 = InitializedEntity::InitializeParameter(S.Context, T,
401 /*Consumed=*/false);
402 InitializationKind Kind
403 = InitializationKind::CreateCopy(Element->getLocStart(),
404 SourceLocation());
405 InitializationSequence Seq(S, Entity, Kind, Element);
406 if (!Seq.Failed())
407 return Seq.Perform(S, Entity, Kind, Element);
408 }
409
410 Expr *OrigElement = Element;
411
412 // Perform lvalue-to-rvalue conversion.
413 Result = S.DefaultLvalueConversion(Element);
414 if (Result.isInvalid())
415 return ExprError();
416 Element = Result.get();
417
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;
422
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
433 : 3;
434
435 S.Diag(OrigElement->getLocStart(), diag::err_box_literal_collection)
436 << Which << OrigElement->getSourceRange()
437 << FixItHint::CreateInsertion(OrigElement->getLocStart(), "@");
438
439 Result = S.BuildObjCNumericLiteral(OrigElement->getLocStart(),
440 OrigElement);
441 if (Result.isInvalid())
442 return ExprError();
443
444 Element = Result.get();
445 Recovered = true;
446 }
447 }
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(), "@");
454
455 Result = S.BuildObjCStringLiteral(OrigElement->getLocStart(), String);
456 if (Result.isInvalid())
457 return ExprError();
458
459 Element = Result.get();
460 Recovered = true;
461 }
462 }
463
464 if (!Recovered) {
465 S.Diag(Element->getLocStart(), diag::err_invalid_collection_element)
466 << Element->getType();
467 return ExprError();
468 }
469 }
470 if (ArrayLiteral)
471 if (ObjCStringLiteral *getString =
472 dyn_cast<ObjCStringLiteral>(OrigElement)) {
473 if (StringLiteral *SL = getString->getString()) {
474 unsigned numConcat = SL->getNumConcatenated();
475 if (numConcat > 1) {
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()) {
480 hasMacro = true;
481 break;
482 }
483 if (!hasMacro)
484 S.Diag(Element->getLocStart(),
485 diag::warn_concatenated_nsarray_literal)
486 << Element->getType();
487 }
488 }
489 }
490
491 // Make sure that the element has the type that the container factory
492 // function expects.
493 return S.PerformCopyInitialization(
494 InitializedEntity::InitializeParameter(S.Context, T,
495 /*Consumed=*/false),
496 Element->getLocStart(), Element);
497 }
498
BuildObjCBoxedExpr(SourceRange SR,Expr * ValueExpr)499 ExprResult Sema::BuildObjCBoxedExpr(SourceRange SR, Expr *ValueExpr) {
500 if (ValueExpr->isTypeDependent()) {
501 ObjCBoxedExpr *BoxedExpr =
502 new (Context) ObjCBoxedExpr(ValueExpr, Context.DependentTy, nullptr, SR);
503 return BoxedExpr;
504 }
505 ObjCMethodDecl *BoxingMethod = nullptr;
506 QualType BoxedType;
507 // Convert the expression to an RValue, so we can check for pointer types...
508 ExprResult RValue = DefaultFunctionArrayLvalueConversion(ValueExpr);
509 if (RValue.isInvalid()) {
510 return ExprError();
511 }
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)) {
518
519 if (!NSStringDecl) {
520 NSStringDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
521 Sema::LK_String);
522 if (!NSStringDecl) {
523 return ExprError();
524 }
525 QualType NSStringObject = Context.getObjCInterfaceType(NSStringDecl);
526 NSStringPointer = Context.getObjCObjectPointerType(NSStringObject);
527 }
528
529 if (!StringWithUTF8StringMethod) {
530 IdentifierInfo *II = &Context.Idents.get("stringWithUTF8String");
531 Selector stringWithUTF8String = Context.Selectors.getUnarySelector(II);
532
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();
547 ParmVarDecl *value =
548 ParmVarDecl::Create(Context, M,
549 SourceLocation(), SourceLocation(),
550 &Context.Idents.get("value"),
551 Context.getPointerType(ConstCharType),
552 /*TInfo=*/nullptr,
553 SC_None, nullptr);
554 M->setMethodParams(Context, value, None);
555 BoxingMethod = M;
556 }
557
558 if (!validateBoxingMethod(*this, Loc, NSStringDecl,
559 stringWithUTF8String, BoxingMethod))
560 return ExprError();
561
562 StringWithUTF8StringMethod = BoxingMethod;
563 }
564
565 BoxingMethod = StringWithUTF8StringMethod;
566 BoxedType = NSStringPointer;
567 }
568 } else if (ValueType->isBuiltinType()) {
569 // The other types we support are numeric, char and BOOL/bool. We could also
570 // provide limited support for structure types, such as NSRange, NSRect, and
571 // NSSize. See NSValue (NSValueGeometryExtensions) in <Foundation/NSGeometry.h>
572 // for more details.
573
574 // Check for a top-level character literal.
575 if (const CharacterLiteral *Char =
576 dyn_cast<CharacterLiteral>(ValueExpr->IgnoreParens())) {
577 // In C, character literals have type 'int'. That's not the type we want
578 // to use to determine the Objective-c literal kind.
579 switch (Char->getKind()) {
580 case CharacterLiteral::Ascii:
581 case CharacterLiteral::UTF8:
582 ValueType = Context.CharTy;
583 break;
584
585 case CharacterLiteral::Wide:
586 ValueType = Context.getWideCharType();
587 break;
588
589 case CharacterLiteral::UTF16:
590 ValueType = Context.Char16Ty;
591 break;
592
593 case CharacterLiteral::UTF32:
594 ValueType = Context.Char32Ty;
595 break;
596 }
597 }
598 CheckForIntOverflow(ValueExpr);
599 // FIXME: Do I need to do anything special with BoolTy expressions?
600
601 // Look for the appropriate method within NSNumber.
602 BoxingMethod = getNSNumberFactoryMethod(*this, Loc, ValueType);
603 BoxedType = NSNumberPointer;
604 } else if (const EnumType *ET = ValueType->getAs<EnumType>()) {
605 if (!ET->getDecl()->isComplete()) {
606 Diag(Loc, diag::err_objc_incomplete_boxed_expression_type)
607 << ValueType << ValueExpr->getSourceRange();
608 return ExprError();
609 }
610
611 BoxingMethod = getNSNumberFactoryMethod(*this, Loc,
612 ET->getDecl()->getIntegerType());
613 BoxedType = NSNumberPointer;
614 } else if (ValueType->isObjCBoxableRecordType()) {
615 // Support for structure types, that marked as objc_boxable
616 // struct __attribute__((objc_boxable)) s { ... };
617
618 // Look up the NSValue class, if we haven't done so already. It's cached
619 // in the Sema instance.
620 if (!NSValueDecl) {
621 NSValueDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
622 Sema::LK_Boxed);
623 if (!NSValueDecl) {
624 return ExprError();
625 }
626
627 // generate the pointer to NSValue type.
628 QualType NSValueObject = Context.getObjCInterfaceType(NSValueDecl);
629 NSValuePointer = Context.getObjCObjectPointerType(NSValueObject);
630 }
631
632 if (!ValueWithBytesObjCTypeMethod) {
633 IdentifierInfo *II[] = {
634 &Context.Idents.get("valueWithBytes"),
635 &Context.Idents.get("objCType")
636 };
637 Selector ValueWithBytesObjCType = Context.Selectors.getSelector(2, II);
638
639 // Look for the appropriate method within NSValue.
640 BoxingMethod = NSValueDecl->lookupClassMethod(ValueWithBytesObjCType);
641 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
642 // Debugger needs to work even if NSValue hasn't been defined.
643 TypeSourceInfo *ReturnTInfo = nullptr;
644 ObjCMethodDecl *M = ObjCMethodDecl::Create(
645 Context,
646 SourceLocation(),
647 SourceLocation(),
648 ValueWithBytesObjCType,
649 NSValuePointer,
650 ReturnTInfo,
651 NSValueDecl,
652 /*isInstance=*/false,
653 /*isVariadic=*/false,
654 /*isPropertyAccessor=*/false,
655 /*isImplicitlyDeclared=*/true,
656 /*isDefined=*/false,
657 ObjCMethodDecl::Required,
658 /*HasRelatedResultType=*/false);
659
660 SmallVector<ParmVarDecl *, 2> Params;
661
662 ParmVarDecl *bytes =
663 ParmVarDecl::Create(Context, M,
664 SourceLocation(), SourceLocation(),
665 &Context.Idents.get("bytes"),
666 Context.VoidPtrTy.withConst(),
667 /*TInfo=*/nullptr,
668 SC_None, nullptr);
669 Params.push_back(bytes);
670
671 QualType ConstCharType = Context.CharTy.withConst();
672 ParmVarDecl *type =
673 ParmVarDecl::Create(Context, M,
674 SourceLocation(), SourceLocation(),
675 &Context.Idents.get("type"),
676 Context.getPointerType(ConstCharType),
677 /*TInfo=*/nullptr,
678 SC_None, nullptr);
679 Params.push_back(type);
680
681 M->setMethodParams(Context, Params, None);
682 BoxingMethod = M;
683 }
684
685 if (!validateBoxingMethod(*this, Loc, NSValueDecl,
686 ValueWithBytesObjCType, BoxingMethod))
687 return ExprError();
688
689 ValueWithBytesObjCTypeMethod = BoxingMethod;
690 }
691
692 if (!ValueType.isTriviallyCopyableType(Context)) {
693 Diag(Loc, diag::err_objc_non_trivially_copyable_boxed_expression_type)
694 << ValueType << ValueExpr->getSourceRange();
695 return ExprError();
696 }
697
698 BoxingMethod = ValueWithBytesObjCTypeMethod;
699 BoxedType = NSValuePointer;
700 }
701
702 if (!BoxingMethod) {
703 Diag(Loc, diag::err_objc_illegal_boxed_expression_type)
704 << ValueType << ValueExpr->getSourceRange();
705 return ExprError();
706 }
707
708 DiagnoseUseOfDecl(BoxingMethod, Loc);
709
710 ExprResult ConvertedValueExpr;
711 if (ValueType->isObjCBoxableRecordType()) {
712 InitializedEntity IE = InitializedEntity::InitializeTemporary(ValueType);
713 ConvertedValueExpr = PerformCopyInitialization(IE, ValueExpr->getExprLoc(),
714 ValueExpr);
715 } else {
716 // Convert the expression to the type that the parameter requires.
717 ParmVarDecl *ParamDecl = BoxingMethod->parameters()[0];
718 InitializedEntity IE = InitializedEntity::InitializeParameter(Context,
719 ParamDecl);
720 ConvertedValueExpr = PerformCopyInitialization(IE, SourceLocation(),
721 ValueExpr);
722 }
723
724 if (ConvertedValueExpr.isInvalid())
725 return ExprError();
726 ValueExpr = ConvertedValueExpr.get();
727
728 ObjCBoxedExpr *BoxedExpr =
729 new (Context) ObjCBoxedExpr(ValueExpr, BoxedType,
730 BoxingMethod, SR);
731 return MaybeBindToTemporary(BoxedExpr);
732 }
733
734 /// Build an ObjC subscript pseudo-object expression, given that
735 /// that's supported by the runtime.
BuildObjCSubscriptExpression(SourceLocation RB,Expr * BaseExpr,Expr * IndexExpr,ObjCMethodDecl * getterMethod,ObjCMethodDecl * setterMethod)736 ExprResult Sema::BuildObjCSubscriptExpression(SourceLocation RB, Expr *BaseExpr,
737 Expr *IndexExpr,
738 ObjCMethodDecl *getterMethod,
739 ObjCMethodDecl *setterMethod) {
740 assert(!LangOpts.isSubscriptPointerArithmetic());
741
742 // We can't get dependent types here; our callers should have
743 // filtered them out.
744 assert((!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) &&
745 "base or index cannot have dependent type here");
746
747 // Filter out placeholders in the index. In theory, overloads could
748 // be preserved here, although that might not actually work correctly.
749 ExprResult Result = CheckPlaceholderExpr(IndexExpr);
750 if (Result.isInvalid())
751 return ExprError();
752 IndexExpr = Result.get();
753
754 // Perform lvalue-to-rvalue conversion on the base.
755 Result = DefaultLvalueConversion(BaseExpr);
756 if (Result.isInvalid())
757 return ExprError();
758 BaseExpr = Result.get();
759
760 // Build the pseudo-object expression.
761 return new (Context) ObjCSubscriptRefExpr(
762 BaseExpr, IndexExpr, Context.PseudoObjectTy, VK_LValue, OK_ObjCSubscript,
763 getterMethod, setterMethod, RB);
764 }
765
BuildObjCArrayLiteral(SourceRange SR,MultiExprArg Elements)766 ExprResult Sema::BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements) {
767 SourceLocation Loc = SR.getBegin();
768
769 if (!NSArrayDecl) {
770 NSArrayDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
771 Sema::LK_Array);
772 if (!NSArrayDecl) {
773 return ExprError();
774 }
775 }
776
777 // Find the arrayWithObjects:count: method, if we haven't done so already.
778 QualType IdT = Context.getObjCIdType();
779 if (!ArrayWithObjectsMethod) {
780 Selector
781 Sel = NSAPIObj->getNSArraySelector(NSAPI::NSArr_arrayWithObjectsCount);
782 ObjCMethodDecl *Method = NSArrayDecl->lookupClassMethod(Sel);
783 if (!Method && getLangOpts().DebuggerObjCLiteral) {
784 TypeSourceInfo *ReturnTInfo = nullptr;
785 Method = ObjCMethodDecl::Create(
786 Context, SourceLocation(), SourceLocation(), Sel, IdT, ReturnTInfo,
787 Context.getTranslationUnitDecl(), false /*Instance*/,
788 false /*isVariadic*/,
789 /*isPropertyAccessor=*/false,
790 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
791 ObjCMethodDecl::Required, false);
792 SmallVector<ParmVarDecl *, 2> Params;
793 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
794 SourceLocation(),
795 SourceLocation(),
796 &Context.Idents.get("objects"),
797 Context.getPointerType(IdT),
798 /*TInfo=*/nullptr,
799 SC_None, nullptr);
800 Params.push_back(objects);
801 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
802 SourceLocation(),
803 SourceLocation(),
804 &Context.Idents.get("cnt"),
805 Context.UnsignedLongTy,
806 /*TInfo=*/nullptr, SC_None,
807 nullptr);
808 Params.push_back(cnt);
809 Method->setMethodParams(Context, Params, None);
810 }
811
812 if (!validateBoxingMethod(*this, Loc, NSArrayDecl, Sel, Method))
813 return ExprError();
814
815 // Dig out the type that all elements should be converted to.
816 QualType T = Method->parameters()[0]->getType();
817 const PointerType *PtrT = T->getAs<PointerType>();
818 if (!PtrT ||
819 !Context.hasSameUnqualifiedType(PtrT->getPointeeType(), IdT)) {
820 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
821 << Sel;
822 Diag(Method->parameters()[0]->getLocation(),
823 diag::note_objc_literal_method_param)
824 << 0 << T
825 << Context.getPointerType(IdT.withConst());
826 return ExprError();
827 }
828
829 // Check that the 'count' parameter is integral.
830 if (!Method->parameters()[1]->getType()->isIntegerType()) {
831 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
832 << Sel;
833 Diag(Method->parameters()[1]->getLocation(),
834 diag::note_objc_literal_method_param)
835 << 1
836 << Method->parameters()[1]->getType()
837 << "integral";
838 return ExprError();
839 }
840
841 // We've found a good +arrayWithObjects:count: method. Save it!
842 ArrayWithObjectsMethod = Method;
843 }
844
845 QualType ObjectsType = ArrayWithObjectsMethod->parameters()[0]->getType();
846 QualType RequiredType = ObjectsType->castAs<PointerType>()->getPointeeType();
847
848 // Check that each of the elements provided is valid in a collection literal,
849 // performing conversions as necessary.
850 Expr **ElementsBuffer = Elements.data();
851 for (unsigned I = 0, N = Elements.size(); I != N; ++I) {
852 ExprResult Converted = CheckObjCCollectionLiteralElement(*this,
853 ElementsBuffer[I],
854 RequiredType, true);
855 if (Converted.isInvalid())
856 return ExprError();
857
858 ElementsBuffer[I] = Converted.get();
859 }
860
861 QualType Ty
862 = Context.getObjCObjectPointerType(
863 Context.getObjCInterfaceType(NSArrayDecl));
864
865 return MaybeBindToTemporary(
866 ObjCArrayLiteral::Create(Context, Elements, Ty,
867 ArrayWithObjectsMethod, SR));
868 }
869
BuildObjCDictionaryLiteral(SourceRange SR,MutableArrayRef<ObjCDictionaryElement> Elements)870 ExprResult Sema::BuildObjCDictionaryLiteral(SourceRange SR,
871 MutableArrayRef<ObjCDictionaryElement> Elements) {
872 SourceLocation Loc = SR.getBegin();
873
874 if (!NSDictionaryDecl) {
875 NSDictionaryDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc,
876 Sema::LK_Dictionary);
877 if (!NSDictionaryDecl) {
878 return ExprError();
879 }
880 }
881
882 // Find the dictionaryWithObjects:forKeys:count: method, if we haven't done
883 // so already.
884 QualType IdT = Context.getObjCIdType();
885 if (!DictionaryWithObjectsMethod) {
886 Selector Sel = NSAPIObj->getNSDictionarySelector(
887 NSAPI::NSDict_dictionaryWithObjectsForKeysCount);
888 ObjCMethodDecl *Method = NSDictionaryDecl->lookupClassMethod(Sel);
889 if (!Method && getLangOpts().DebuggerObjCLiteral) {
890 Method = ObjCMethodDecl::Create(Context,
891 SourceLocation(), SourceLocation(), Sel,
892 IdT,
893 nullptr /*TypeSourceInfo */,
894 Context.getTranslationUnitDecl(),
895 false /*Instance*/, false/*isVariadic*/,
896 /*isPropertyAccessor=*/false,
897 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
898 ObjCMethodDecl::Required,
899 false);
900 SmallVector<ParmVarDecl *, 3> Params;
901 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
902 SourceLocation(),
903 SourceLocation(),
904 &Context.Idents.get("objects"),
905 Context.getPointerType(IdT),
906 /*TInfo=*/nullptr, SC_None,
907 nullptr);
908 Params.push_back(objects);
909 ParmVarDecl *keys = ParmVarDecl::Create(Context, Method,
910 SourceLocation(),
911 SourceLocation(),
912 &Context.Idents.get("keys"),
913 Context.getPointerType(IdT),
914 /*TInfo=*/nullptr, SC_None,
915 nullptr);
916 Params.push_back(keys);
917 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
918 SourceLocation(),
919 SourceLocation(),
920 &Context.Idents.get("cnt"),
921 Context.UnsignedLongTy,
922 /*TInfo=*/nullptr, SC_None,
923 nullptr);
924 Params.push_back(cnt);
925 Method->setMethodParams(Context, Params, None);
926 }
927
928 if (!validateBoxingMethod(*this, SR.getBegin(), NSDictionaryDecl, Sel,
929 Method))
930 return ExprError();
931
932 // Dig out the type that all values should be converted to.
933 QualType ValueT = Method->parameters()[0]->getType();
934 const PointerType *PtrValue = ValueT->getAs<PointerType>();
935 if (!PtrValue ||
936 !Context.hasSameUnqualifiedType(PtrValue->getPointeeType(), IdT)) {
937 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
938 << Sel;
939 Diag(Method->parameters()[0]->getLocation(),
940 diag::note_objc_literal_method_param)
941 << 0 << ValueT
942 << Context.getPointerType(IdT.withConst());
943 return ExprError();
944 }
945
946 // Dig out the type that all keys should be converted to.
947 QualType KeyT = Method->parameters()[1]->getType();
948 const PointerType *PtrKey = KeyT->getAs<PointerType>();
949 if (!PtrKey ||
950 !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
951 IdT)) {
952 bool err = true;
953 if (PtrKey) {
954 if (QIDNSCopying.isNull()) {
955 // key argument of selector is id<NSCopying>?
956 if (ObjCProtocolDecl *NSCopyingPDecl =
957 LookupProtocol(&Context.Idents.get("NSCopying"), SR.getBegin())) {
958 ObjCProtocolDecl *PQ[] = {NSCopyingPDecl};
959 QIDNSCopying =
960 Context.getObjCObjectType(Context.ObjCBuiltinIdTy, { },
961 llvm::makeArrayRef(
962 (ObjCProtocolDecl**) PQ,
963 1),
964 false);
965 QIDNSCopying = Context.getObjCObjectPointerType(QIDNSCopying);
966 }
967 }
968 if (!QIDNSCopying.isNull())
969 err = !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
970 QIDNSCopying);
971 }
972
973 if (err) {
974 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
975 << Sel;
976 Diag(Method->parameters()[1]->getLocation(),
977 diag::note_objc_literal_method_param)
978 << 1 << KeyT
979 << Context.getPointerType(IdT.withConst());
980 return ExprError();
981 }
982 }
983
984 // Check that the 'count' parameter is integral.
985 QualType CountType = Method->parameters()[2]->getType();
986 if (!CountType->isIntegerType()) {
987 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
988 << Sel;
989 Diag(Method->parameters()[2]->getLocation(),
990 diag::note_objc_literal_method_param)
991 << 2 << CountType
992 << "integral";
993 return ExprError();
994 }
995
996 // We've found a good +dictionaryWithObjects:keys:count: method; save it!
997 DictionaryWithObjectsMethod = Method;
998 }
999
1000 QualType ValuesT = DictionaryWithObjectsMethod->parameters()[0]->getType();
1001 QualType ValueT = ValuesT->castAs<PointerType>()->getPointeeType();
1002 QualType KeysT = DictionaryWithObjectsMethod->parameters()[1]->getType();
1003 QualType KeyT = KeysT->castAs<PointerType>()->getPointeeType();
1004
1005 // Check that each of the keys and values provided is valid in a collection
1006 // literal, performing conversions as necessary.
1007 bool HasPackExpansions = false;
1008 for (ObjCDictionaryElement &Element : Elements) {
1009 // Check the key.
1010 ExprResult Key = CheckObjCCollectionLiteralElement(*this, Element.Key,
1011 KeyT);
1012 if (Key.isInvalid())
1013 return ExprError();
1014
1015 // Check the value.
1016 ExprResult Value
1017 = CheckObjCCollectionLiteralElement(*this, Element.Value, ValueT);
1018 if (Value.isInvalid())
1019 return ExprError();
1020
1021 Element.Key = Key.get();
1022 Element.Value = Value.get();
1023
1024 if (Element.EllipsisLoc.isInvalid())
1025 continue;
1026
1027 if (!Element.Key->containsUnexpandedParameterPack() &&
1028 !Element.Value->containsUnexpandedParameterPack()) {
1029 Diag(Element.EllipsisLoc,
1030 diag::err_pack_expansion_without_parameter_packs)
1031 << SourceRange(Element.Key->getLocStart(),
1032 Element.Value->getLocEnd());
1033 return ExprError();
1034 }
1035
1036 HasPackExpansions = true;
1037 }
1038
1039 QualType Ty
1040 = Context.getObjCObjectPointerType(
1041 Context.getObjCInterfaceType(NSDictionaryDecl));
1042 return MaybeBindToTemporary(ObjCDictionaryLiteral::Create(
1043 Context, Elements, HasPackExpansions, Ty,
1044 DictionaryWithObjectsMethod, SR));
1045 }
1046
BuildObjCEncodeExpression(SourceLocation AtLoc,TypeSourceInfo * EncodedTypeInfo,SourceLocation RParenLoc)1047 ExprResult Sema::BuildObjCEncodeExpression(SourceLocation AtLoc,
1048 TypeSourceInfo *EncodedTypeInfo,
1049 SourceLocation RParenLoc) {
1050 QualType EncodedType = EncodedTypeInfo->getType();
1051 QualType StrTy;
1052 if (EncodedType->isDependentType())
1053 StrTy = Context.DependentTy;
1054 else {
1055 if (!EncodedType->getAsArrayTypeUnsafe() && //// Incomplete array is handled.
1056 !EncodedType->isVoidType()) // void is handled too.
1057 if (RequireCompleteType(AtLoc, EncodedType,
1058 diag::err_incomplete_type_objc_at_encode,
1059 EncodedTypeInfo->getTypeLoc()))
1060 return ExprError();
1061
1062 std::string Str;
1063 QualType NotEncodedT;
1064 Context.getObjCEncodingForType(EncodedType, Str, nullptr, &NotEncodedT);
1065 if (!NotEncodedT.isNull())
1066 Diag(AtLoc, diag::warn_incomplete_encoded_type)
1067 << EncodedType << NotEncodedT;
1068
1069 // The type of @encode is the same as the type of the corresponding string,
1070 // which is an array type.
1071 StrTy = Context.CharTy;
1072 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
1073 if (getLangOpts().CPlusPlus || getLangOpts().ConstStrings)
1074 StrTy.addConst();
1075 StrTy = Context.getConstantArrayType(StrTy, llvm::APInt(32, Str.size()+1),
1076 ArrayType::Normal, 0);
1077 }
1078
1079 return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc);
1080 }
1081
ParseObjCEncodeExpression(SourceLocation AtLoc,SourceLocation EncodeLoc,SourceLocation LParenLoc,ParsedType ty,SourceLocation RParenLoc)1082 ExprResult Sema::ParseObjCEncodeExpression(SourceLocation AtLoc,
1083 SourceLocation EncodeLoc,
1084 SourceLocation LParenLoc,
1085 ParsedType ty,
1086 SourceLocation RParenLoc) {
1087 // FIXME: Preserve type source info ?
1088 TypeSourceInfo *TInfo;
1089 QualType EncodedType = GetTypeFromParser(ty, &TInfo);
1090 if (!TInfo)
1091 TInfo = Context.getTrivialTypeSourceInfo(EncodedType,
1092 getLocForEndOfToken(LParenLoc));
1093
1094 return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc);
1095 }
1096
HelperToDiagnoseMismatchedMethodsInGlobalPool(Sema & S,SourceLocation AtLoc,SourceLocation LParenLoc,SourceLocation RParenLoc,ObjCMethodDecl * Method,ObjCMethodList & MethList)1097 static bool HelperToDiagnoseMismatchedMethodsInGlobalPool(Sema &S,
1098 SourceLocation AtLoc,
1099 SourceLocation LParenLoc,
1100 SourceLocation RParenLoc,
1101 ObjCMethodDecl *Method,
1102 ObjCMethodList &MethList) {
1103 ObjCMethodList *M = &MethList;
1104 bool Warned = false;
1105 for (M = M->getNext(); M; M=M->getNext()) {
1106 ObjCMethodDecl *MatchingMethodDecl = M->getMethod();
1107 if (MatchingMethodDecl == Method ||
1108 isa<ObjCImplDecl>(MatchingMethodDecl->getDeclContext()) ||
1109 MatchingMethodDecl->getSelector() != Method->getSelector())
1110 continue;
1111 if (!S.MatchTwoMethodDeclarations(Method,
1112 MatchingMethodDecl, Sema::MMS_loose)) {
1113 if (!Warned) {
1114 Warned = true;
1115 S.Diag(AtLoc, diag::warning_multiple_selectors)
1116 << Method->getSelector() << FixItHint::CreateInsertion(LParenLoc, "(")
1117 << FixItHint::CreateInsertion(RParenLoc, ")");
1118 S.Diag(Method->getLocation(), diag::note_method_declared_at)
1119 << Method->getDeclName();
1120 }
1121 S.Diag(MatchingMethodDecl->getLocation(), diag::note_method_declared_at)
1122 << MatchingMethodDecl->getDeclName();
1123 }
1124 }
1125 return Warned;
1126 }
1127
DiagnoseMismatchedSelectors(Sema & S,SourceLocation AtLoc,ObjCMethodDecl * Method,SourceLocation LParenLoc,SourceLocation RParenLoc,bool WarnMultipleSelectors)1128 static void DiagnoseMismatchedSelectors(Sema &S, SourceLocation AtLoc,
1129 ObjCMethodDecl *Method,
1130 SourceLocation LParenLoc,
1131 SourceLocation RParenLoc,
1132 bool WarnMultipleSelectors) {
1133 if (!WarnMultipleSelectors ||
1134 S.Diags.isIgnored(diag::warning_multiple_selectors, SourceLocation()))
1135 return;
1136 bool Warned = false;
1137 for (Sema::GlobalMethodPool::iterator b = S.MethodPool.begin(),
1138 e = S.MethodPool.end(); b != e; b++) {
1139 // first, instance methods
1140 ObjCMethodList &InstMethList = b->second.first;
1141 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1142 Method, InstMethList))
1143 Warned = true;
1144
1145 // second, class methods
1146 ObjCMethodList &ClsMethList = b->second.second;
1147 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc,
1148 Method, ClsMethList) || Warned)
1149 return;
1150 }
1151 }
1152
ParseObjCSelectorExpression(Selector Sel,SourceLocation AtLoc,SourceLocation SelLoc,SourceLocation LParenLoc,SourceLocation RParenLoc,bool WarnMultipleSelectors)1153 ExprResult Sema::ParseObjCSelectorExpression(Selector Sel,
1154 SourceLocation AtLoc,
1155 SourceLocation SelLoc,
1156 SourceLocation LParenLoc,
1157 SourceLocation RParenLoc,
1158 bool WarnMultipleSelectors) {
1159 ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel,
1160 SourceRange(LParenLoc, RParenLoc));
1161 if (!Method)
1162 Method = LookupFactoryMethodInGlobalPool(Sel,
1163 SourceRange(LParenLoc, RParenLoc));
1164 if (!Method) {
1165 if (const ObjCMethodDecl *OM = SelectorsForTypoCorrection(Sel)) {
1166 Selector MatchedSel = OM->getSelector();
1167 SourceRange SelectorRange(LParenLoc.getLocWithOffset(1),
1168 RParenLoc.getLocWithOffset(-1));
1169 Diag(SelLoc, diag::warn_undeclared_selector_with_typo)
1170 << Sel << MatchedSel
1171 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1172
1173 } else
1174 Diag(SelLoc, diag::warn_undeclared_selector) << Sel;
1175 } else
1176 DiagnoseMismatchedSelectors(*this, AtLoc, Method, LParenLoc, RParenLoc,
1177 WarnMultipleSelectors);
1178
1179 if (Method &&
1180 Method->getImplementationControl() != ObjCMethodDecl::Optional &&
1181 !getSourceManager().isInSystemHeader(Method->getLocation()))
1182 ReferencedSelectors.insert(std::make_pair(Sel, AtLoc));
1183
1184 // In ARC, forbid the user from using @selector for
1185 // retain/release/autorelease/dealloc/retainCount.
1186 if (getLangOpts().ObjCAutoRefCount) {
1187 switch (Sel.getMethodFamily()) {
1188 case OMF_retain:
1189 case OMF_release:
1190 case OMF_autorelease:
1191 case OMF_retainCount:
1192 case OMF_dealloc:
1193 Diag(AtLoc, diag::err_arc_illegal_selector) <<
1194 Sel << SourceRange(LParenLoc, RParenLoc);
1195 break;
1196
1197 case OMF_None:
1198 case OMF_alloc:
1199 case OMF_copy:
1200 case OMF_finalize:
1201 case OMF_init:
1202 case OMF_mutableCopy:
1203 case OMF_new:
1204 case OMF_self:
1205 case OMF_initialize:
1206 case OMF_performSelector:
1207 break;
1208 }
1209 }
1210 QualType Ty = Context.getObjCSelType();
1211 return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc);
1212 }
1213
ParseObjCProtocolExpression(IdentifierInfo * ProtocolId,SourceLocation AtLoc,SourceLocation ProtoLoc,SourceLocation LParenLoc,SourceLocation ProtoIdLoc,SourceLocation RParenLoc)1214 ExprResult Sema::ParseObjCProtocolExpression(IdentifierInfo *ProtocolId,
1215 SourceLocation AtLoc,
1216 SourceLocation ProtoLoc,
1217 SourceLocation LParenLoc,
1218 SourceLocation ProtoIdLoc,
1219 SourceLocation RParenLoc) {
1220 ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoIdLoc);
1221 if (!PDecl) {
1222 Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId;
1223 return true;
1224 }
1225 if (PDecl->hasDefinition())
1226 PDecl = PDecl->getDefinition();
1227
1228 QualType Ty = Context.getObjCProtoType();
1229 if (Ty.isNull())
1230 return true;
1231 Ty = Context.getObjCObjectPointerType(Ty);
1232 return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, ProtoIdLoc, RParenLoc);
1233 }
1234
1235 /// Try to capture an implicit reference to 'self'.
tryCaptureObjCSelf(SourceLocation Loc)1236 ObjCMethodDecl *Sema::tryCaptureObjCSelf(SourceLocation Loc) {
1237 DeclContext *DC = getFunctionLevelDeclContext();
1238
1239 // If we're not in an ObjC method, error out. Note that, unlike the
1240 // C++ case, we don't require an instance method --- class methods
1241 // still have a 'self', and we really do still need to capture it!
1242 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(DC);
1243 if (!method)
1244 return nullptr;
1245
1246 tryCaptureVariable(method->getSelfDecl(), Loc);
1247
1248 return method;
1249 }
1250
stripObjCInstanceType(ASTContext & Context,QualType T)1251 static QualType stripObjCInstanceType(ASTContext &Context, QualType T) {
1252 QualType origType = T;
1253 if (auto nullability = AttributedType::stripOuterNullability(T)) {
1254 if (T == Context.getObjCInstanceType()) {
1255 return Context.getAttributedType(
1256 AttributedType::getNullabilityAttrKind(*nullability),
1257 Context.getObjCIdType(),
1258 Context.getObjCIdType());
1259 }
1260
1261 return origType;
1262 }
1263
1264 if (T == Context.getObjCInstanceType())
1265 return Context.getObjCIdType();
1266
1267 return origType;
1268 }
1269
1270 /// Determine the result type of a message send based on the receiver type,
1271 /// method, and the kind of message send.
1272 ///
1273 /// This is the "base" result type, which will still need to be adjusted
1274 /// to account for nullability.
getBaseMessageSendResultType(Sema & S,QualType ReceiverType,ObjCMethodDecl * Method,bool isClassMessage,bool isSuperMessage)1275 static QualType getBaseMessageSendResultType(Sema &S,
1276 QualType ReceiverType,
1277 ObjCMethodDecl *Method,
1278 bool isClassMessage,
1279 bool isSuperMessage) {
1280 assert(Method && "Must have a method");
1281 if (!Method->hasRelatedResultType())
1282 return Method->getSendResultType(ReceiverType);
1283
1284 ASTContext &Context = S.Context;
1285
1286 // Local function that transfers the nullability of the method's
1287 // result type to the returned result.
1288 auto transferNullability = [&](QualType type) -> QualType {
1289 // If the method's result type has nullability, extract it.
1290 if (auto nullability = Method->getSendResultType(ReceiverType)
1291 ->getNullability(Context)){
1292 // Strip off any outer nullability sugar from the provided type.
1293 (void)AttributedType::stripOuterNullability(type);
1294
1295 // Form a new attributed type using the method result type's nullability.
1296 return Context.getAttributedType(
1297 AttributedType::getNullabilityAttrKind(*nullability),
1298 type,
1299 type);
1300 }
1301
1302 return type;
1303 };
1304
1305 // If a method has a related return type:
1306 // - if the method found is an instance method, but the message send
1307 // was a class message send, T is the declared return type of the method
1308 // found
1309 if (Method->isInstanceMethod() && isClassMessage)
1310 return stripObjCInstanceType(Context,
1311 Method->getSendResultType(ReceiverType));
1312
1313 // - if the receiver is super, T is a pointer to the class of the
1314 // enclosing method definition
1315 if (isSuperMessage) {
1316 if (ObjCMethodDecl *CurMethod = S.getCurMethodDecl())
1317 if (ObjCInterfaceDecl *Class = CurMethod->getClassInterface()) {
1318 return transferNullability(
1319 Context.getObjCObjectPointerType(
1320 Context.getObjCInterfaceType(Class)));
1321 }
1322 }
1323
1324 // - if the receiver is the name of a class U, T is a pointer to U
1325 if (ReceiverType->getAsObjCInterfaceType())
1326 return transferNullability(Context.getObjCObjectPointerType(ReceiverType));
1327 // - if the receiver is of type Class or qualified Class type,
1328 // T is the declared return type of the method.
1329 if (ReceiverType->isObjCClassType() ||
1330 ReceiverType->isObjCQualifiedClassType())
1331 return stripObjCInstanceType(Context,
1332 Method->getSendResultType(ReceiverType));
1333
1334 // - if the receiver is id, qualified id, Class, or qualified Class, T
1335 // is the receiver type, otherwise
1336 // - T is the type of the receiver expression.
1337 return transferNullability(ReceiverType);
1338 }
1339
getMessageSendResultType(QualType ReceiverType,ObjCMethodDecl * Method,bool isClassMessage,bool isSuperMessage)1340 QualType Sema::getMessageSendResultType(QualType ReceiverType,
1341 ObjCMethodDecl *Method,
1342 bool isClassMessage,
1343 bool isSuperMessage) {
1344 // Produce the result type.
1345 QualType resultType = getBaseMessageSendResultType(*this, ReceiverType,
1346 Method,
1347 isClassMessage,
1348 isSuperMessage);
1349
1350 // If this is a class message, ignore the nullability of the receiver.
1351 if (isClassMessage)
1352 return resultType;
1353
1354 // Map the nullability of the result into a table index.
1355 unsigned receiverNullabilityIdx = 0;
1356 if (auto nullability = ReceiverType->getNullability(Context))
1357 receiverNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1358
1359 unsigned resultNullabilityIdx = 0;
1360 if (auto nullability = resultType->getNullability(Context))
1361 resultNullabilityIdx = 1 + static_cast<unsigned>(*nullability);
1362
1363 // The table of nullability mappings, indexed by the receiver's nullability
1364 // and then the result type's nullability.
1365 static const uint8_t None = 0;
1366 static const uint8_t NonNull = 1;
1367 static const uint8_t Nullable = 2;
1368 static const uint8_t Unspecified = 3;
1369 static const uint8_t nullabilityMap[4][4] = {
1370 // None NonNull Nullable Unspecified
1371 /* None */ { None, None, Nullable, None },
1372 /* NonNull */ { None, NonNull, Nullable, Unspecified },
1373 /* Nullable */ { Nullable, Nullable, Nullable, Nullable },
1374 /* Unspecified */ { None, Unspecified, Nullable, Unspecified }
1375 };
1376
1377 unsigned newResultNullabilityIdx
1378 = nullabilityMap[receiverNullabilityIdx][resultNullabilityIdx];
1379 if (newResultNullabilityIdx == resultNullabilityIdx)
1380 return resultType;
1381
1382 // Strip off the existing nullability. This removes as little type sugar as
1383 // possible.
1384 do {
1385 if (auto attributed = dyn_cast<AttributedType>(resultType.getTypePtr())) {
1386 resultType = attributed->getModifiedType();
1387 } else {
1388 resultType = resultType.getDesugaredType(Context);
1389 }
1390 } while (resultType->getNullability(Context));
1391
1392 // Add nullability back if needed.
1393 if (newResultNullabilityIdx > 0) {
1394 auto newNullability
1395 = static_cast<NullabilityKind>(newResultNullabilityIdx-1);
1396 return Context.getAttributedType(
1397 AttributedType::getNullabilityAttrKind(newNullability),
1398 resultType, resultType);
1399 }
1400
1401 return resultType;
1402 }
1403
1404 /// Look for an ObjC method whose result type exactly matches the given type.
1405 static const ObjCMethodDecl *
findExplicitInstancetypeDeclarer(const ObjCMethodDecl * MD,QualType instancetype)1406 findExplicitInstancetypeDeclarer(const ObjCMethodDecl *MD,
1407 QualType instancetype) {
1408 if (MD->getReturnType() == instancetype)
1409 return MD;
1410
1411 // For these purposes, a method in an @implementation overrides a
1412 // declaration in the @interface.
1413 if (const ObjCImplDecl *impl =
1414 dyn_cast<ObjCImplDecl>(MD->getDeclContext())) {
1415 const ObjCContainerDecl *iface;
1416 if (const ObjCCategoryImplDecl *catImpl =
1417 dyn_cast<ObjCCategoryImplDecl>(impl)) {
1418 iface = catImpl->getCategoryDecl();
1419 } else {
1420 iface = impl->getClassInterface();
1421 }
1422
1423 const ObjCMethodDecl *ifaceMD =
1424 iface->getMethod(MD->getSelector(), MD->isInstanceMethod());
1425 if (ifaceMD) return findExplicitInstancetypeDeclarer(ifaceMD, instancetype);
1426 }
1427
1428 SmallVector<const ObjCMethodDecl *, 4> overrides;
1429 MD->getOverriddenMethods(overrides);
1430 for (unsigned i = 0, e = overrides.size(); i != e; ++i) {
1431 if (const ObjCMethodDecl *result =
1432 findExplicitInstancetypeDeclarer(overrides[i], instancetype))
1433 return result;
1434 }
1435
1436 return nullptr;
1437 }
1438
EmitRelatedResultTypeNoteForReturn(QualType destType)1439 void Sema::EmitRelatedResultTypeNoteForReturn(QualType destType) {
1440 // Only complain if we're in an ObjC method and the required return
1441 // type doesn't match the method's declared return type.
1442 ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurContext);
1443 if (!MD || !MD->hasRelatedResultType() ||
1444 Context.hasSameUnqualifiedType(destType, MD->getReturnType()))
1445 return;
1446
1447 // Look for a method overridden by this method which explicitly uses
1448 // 'instancetype'.
1449 if (const ObjCMethodDecl *overridden =
1450 findExplicitInstancetypeDeclarer(MD, Context.getObjCInstanceType())) {
1451 SourceRange range = overridden->getReturnTypeSourceRange();
1452 SourceLocation loc = range.getBegin();
1453 if (loc.isInvalid())
1454 loc = overridden->getLocation();
1455 Diag(loc, diag::note_related_result_type_explicit)
1456 << /*current method*/ 1 << range;
1457 return;
1458 }
1459
1460 // Otherwise, if we have an interesting method family, note that.
1461 // This should always trigger if the above didn't.
1462 if (ObjCMethodFamily family = MD->getMethodFamily())
1463 Diag(MD->getLocation(), diag::note_related_result_type_family)
1464 << /*current method*/ 1
1465 << family;
1466 }
1467
EmitRelatedResultTypeNote(const Expr * E)1468 void Sema::EmitRelatedResultTypeNote(const Expr *E) {
1469 E = E->IgnoreParenImpCasts();
1470 const ObjCMessageExpr *MsgSend = dyn_cast<ObjCMessageExpr>(E);
1471 if (!MsgSend)
1472 return;
1473
1474 const ObjCMethodDecl *Method = MsgSend->getMethodDecl();
1475 if (!Method)
1476 return;
1477
1478 if (!Method->hasRelatedResultType())
1479 return;
1480
1481 if (Context.hasSameUnqualifiedType(
1482 Method->getReturnType().getNonReferenceType(), MsgSend->getType()))
1483 return;
1484
1485 if (!Context.hasSameUnqualifiedType(Method->getReturnType(),
1486 Context.getObjCInstanceType()))
1487 return;
1488
1489 Diag(Method->getLocation(), diag::note_related_result_type_inferred)
1490 << Method->isInstanceMethod() << Method->getSelector()
1491 << MsgSend->getType();
1492 }
1493
CheckMessageArgumentTypes(QualType ReceiverType,MultiExprArg Args,Selector Sel,ArrayRef<SourceLocation> SelectorLocs,ObjCMethodDecl * Method,bool isClassMessage,bool isSuperMessage,SourceLocation lbrac,SourceLocation rbrac,SourceRange RecRange,QualType & ReturnType,ExprValueKind & VK)1494 bool Sema::CheckMessageArgumentTypes(QualType ReceiverType,
1495 MultiExprArg Args,
1496 Selector Sel,
1497 ArrayRef<SourceLocation> SelectorLocs,
1498 ObjCMethodDecl *Method,
1499 bool isClassMessage, bool isSuperMessage,
1500 SourceLocation lbrac, SourceLocation rbrac,
1501 SourceRange RecRange,
1502 QualType &ReturnType, ExprValueKind &VK) {
1503 SourceLocation SelLoc;
1504 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
1505 SelLoc = SelectorLocs.front();
1506 else
1507 SelLoc = lbrac;
1508
1509 if (!Method) {
1510 // Apply default argument promotion as for (C99 6.5.2.2p6).
1511 for (unsigned i = 0, e = Args.size(); i != e; i++) {
1512 if (Args[i]->isTypeDependent())
1513 continue;
1514
1515 ExprResult result;
1516 if (getLangOpts().DebuggerSupport) {
1517 QualType paramTy; // ignored
1518 result = checkUnknownAnyArg(SelLoc, Args[i], paramTy);
1519 } else {
1520 result = DefaultArgumentPromotion(Args[i]);
1521 }
1522 if (result.isInvalid())
1523 return true;
1524 Args[i] = result.get();
1525 }
1526
1527 unsigned DiagID;
1528 if (getLangOpts().ObjCAutoRefCount)
1529 DiagID = diag::err_arc_method_not_found;
1530 else
1531 DiagID = isClassMessage ? diag::warn_class_method_not_found
1532 : diag::warn_inst_method_not_found;
1533 if (!getLangOpts().DebuggerSupport) {
1534 const ObjCMethodDecl *OMD = SelectorsForTypoCorrection(Sel, ReceiverType);
1535 if (OMD && !OMD->isInvalidDecl()) {
1536 if (getLangOpts().ObjCAutoRefCount)
1537 DiagID = diag::error_method_not_found_with_typo;
1538 else
1539 DiagID = isClassMessage ? diag::warn_class_method_not_found_with_typo
1540 : diag::warn_instance_method_not_found_with_typo;
1541 Selector MatchedSel = OMD->getSelector();
1542 SourceRange SelectorRange(SelectorLocs.front(), SelectorLocs.back());
1543 if (MatchedSel.isUnarySelector())
1544 Diag(SelLoc, DiagID)
1545 << Sel<< isClassMessage << MatchedSel
1546 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1547 else
1548 Diag(SelLoc, DiagID) << Sel<< isClassMessage << MatchedSel;
1549 }
1550 else
1551 Diag(SelLoc, DiagID)
1552 << Sel << isClassMessage << SourceRange(SelectorLocs.front(),
1553 SelectorLocs.back());
1554 // Find the class to which we are sending this message.
1555 if (ReceiverType->isObjCObjectPointerType()) {
1556 if (ObjCInterfaceDecl *ThisClass =
1557 ReceiverType->getAs<ObjCObjectPointerType>()->getInterfaceDecl()) {
1558 Diag(ThisClass->getLocation(), diag::note_receiver_class_declared);
1559 if (!RecRange.isInvalid())
1560 if (ThisClass->lookupClassMethod(Sel))
1561 Diag(RecRange.getBegin(),diag::note_receiver_expr_here)
1562 << FixItHint::CreateReplacement(RecRange,
1563 ThisClass->getNameAsString());
1564 }
1565 }
1566 }
1567
1568 // In debuggers, we want to use __unknown_anytype for these
1569 // results so that clients can cast them.
1570 if (getLangOpts().DebuggerSupport) {
1571 ReturnType = Context.UnknownAnyTy;
1572 } else {
1573 ReturnType = Context.getObjCIdType();
1574 }
1575 VK = VK_RValue;
1576 return false;
1577 }
1578
1579 ReturnType = getMessageSendResultType(ReceiverType, Method, isClassMessage,
1580 isSuperMessage);
1581 VK = Expr::getValueKindForType(Method->getReturnType());
1582
1583 unsigned NumNamedArgs = Sel.getNumArgs();
1584 // Method might have more arguments than selector indicates. This is due
1585 // to addition of c-style arguments in method.
1586 if (Method->param_size() > Sel.getNumArgs())
1587 NumNamedArgs = Method->param_size();
1588 // FIXME. This need be cleaned up.
1589 if (Args.size() < NumNamedArgs) {
1590 Diag(SelLoc, diag::err_typecheck_call_too_few_args)
1591 << 2 << NumNamedArgs << static_cast<unsigned>(Args.size());
1592 return false;
1593 }
1594
1595 // Compute the set of type arguments to be substituted into each parameter
1596 // type.
1597 Optional<ArrayRef<QualType>> typeArgs
1598 = ReceiverType->getObjCSubstitutions(Method->getDeclContext());
1599 bool IsError = false;
1600 for (unsigned i = 0; i < NumNamedArgs; i++) {
1601 // We can't do any type-checking on a type-dependent argument.
1602 if (Args[i]->isTypeDependent())
1603 continue;
1604
1605 Expr *argExpr = Args[i];
1606
1607 ParmVarDecl *param = Method->parameters()[i];
1608 assert(argExpr && "CheckMessageArgumentTypes(): missing expression");
1609
1610 // Strip the unbridged-cast placeholder expression off unless it's
1611 // a consumed argument.
1612 if (argExpr->hasPlaceholderType(BuiltinType::ARCUnbridgedCast) &&
1613 !param->hasAttr<CFConsumedAttr>())
1614 argExpr = stripARCUnbridgedCast(argExpr);
1615
1616 // If the parameter is __unknown_anytype, infer its type
1617 // from the argument.
1618 if (param->getType() == Context.UnknownAnyTy) {
1619 QualType paramType;
1620 ExprResult argE = checkUnknownAnyArg(SelLoc, argExpr, paramType);
1621 if (argE.isInvalid()) {
1622 IsError = true;
1623 } else {
1624 Args[i] = argE.get();
1625
1626 // Update the parameter type in-place.
1627 param->setType(paramType);
1628 }
1629 continue;
1630 }
1631
1632 QualType origParamType = param->getType();
1633 QualType paramType = param->getType();
1634 if (typeArgs)
1635 paramType = paramType.substObjCTypeArgs(
1636 Context,
1637 *typeArgs,
1638 ObjCSubstitutionContext::Parameter);
1639
1640 if (RequireCompleteType(argExpr->getSourceRange().getBegin(),
1641 paramType,
1642 diag::err_call_incomplete_argument, argExpr))
1643 return true;
1644
1645 InitializedEntity Entity
1646 = InitializedEntity::InitializeParameter(Context, param, paramType);
1647 ExprResult ArgE = PerformCopyInitialization(Entity, SourceLocation(), argExpr);
1648 if (ArgE.isInvalid())
1649 IsError = true;
1650 else {
1651 Args[i] = ArgE.getAs<Expr>();
1652
1653 // If we are type-erasing a block to a block-compatible
1654 // Objective-C pointer type, we may need to extend the lifetime
1655 // of the block object.
1656 if (typeArgs && Args[i]->isRValue() && paramType->isBlockPointerType() &&
1657 Args[i]->getType()->isBlockPointerType() &&
1658 origParamType->isObjCObjectPointerType()) {
1659 ExprResult arg = Args[i];
1660 maybeExtendBlockObject(arg);
1661 Args[i] = arg.get();
1662 }
1663 }
1664 }
1665
1666 // Promote additional arguments to variadic methods.
1667 if (Method->isVariadic()) {
1668 for (unsigned i = NumNamedArgs, e = Args.size(); i < e; ++i) {
1669 if (Args[i]->isTypeDependent())
1670 continue;
1671
1672 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod,
1673 nullptr);
1674 IsError |= Arg.isInvalid();
1675 Args[i] = Arg.get();
1676 }
1677 } else {
1678 // Check for extra arguments to non-variadic methods.
1679 if (Args.size() != NumNamedArgs) {
1680 Diag(Args[NumNamedArgs]->getLocStart(),
1681 diag::err_typecheck_call_too_many_args)
1682 << 2 /*method*/ << NumNamedArgs << static_cast<unsigned>(Args.size())
1683 << Method->getSourceRange()
1684 << SourceRange(Args[NumNamedArgs]->getLocStart(),
1685 Args.back()->getLocEnd());
1686 }
1687 }
1688
1689 DiagnoseSentinelCalls(Method, SelLoc, Args);
1690
1691 // Do additional checkings on method.
1692 IsError |= CheckObjCMethodCall(
1693 Method, SelLoc, makeArrayRef(Args.data(), Args.size()));
1694
1695 return IsError;
1696 }
1697
isSelfExpr(Expr * RExpr)1698 bool Sema::isSelfExpr(Expr *RExpr) {
1699 // 'self' is objc 'self' in an objc method only.
1700 ObjCMethodDecl *Method =
1701 dyn_cast_or_null<ObjCMethodDecl>(CurContext->getNonClosureAncestor());
1702 return isSelfExpr(RExpr, Method);
1703 }
1704
isSelfExpr(Expr * receiver,const ObjCMethodDecl * method)1705 bool Sema::isSelfExpr(Expr *receiver, const ObjCMethodDecl *method) {
1706 if (!method) return false;
1707
1708 receiver = receiver->IgnoreParenLValueCasts();
1709 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(receiver))
1710 if (DRE->getDecl() == method->getSelfDecl())
1711 return true;
1712 return false;
1713 }
1714
1715 /// LookupMethodInType - Look up a method in an ObjCObjectType.
LookupMethodInObjectType(Selector sel,QualType type,bool isInstance)1716 ObjCMethodDecl *Sema::LookupMethodInObjectType(Selector sel, QualType type,
1717 bool isInstance) {
1718 const ObjCObjectType *objType = type->castAs<ObjCObjectType>();
1719 if (ObjCInterfaceDecl *iface = objType->getInterface()) {
1720 // Look it up in the main interface (and categories, etc.)
1721 if (ObjCMethodDecl *method = iface->lookupMethod(sel, isInstance))
1722 return method;
1723
1724 // Okay, look for "private" methods declared in any
1725 // @implementations we've seen.
1726 if (ObjCMethodDecl *method = iface->lookupPrivateMethod(sel, isInstance))
1727 return method;
1728 }
1729
1730 // Check qualifiers.
1731 for (const auto *I : objType->quals())
1732 if (ObjCMethodDecl *method = I->lookupMethod(sel, isInstance))
1733 return method;
1734
1735 return nullptr;
1736 }
1737
1738 /// LookupMethodInQualifiedType - Lookups up a method in protocol qualifier
1739 /// list of a qualified objective pointer type.
LookupMethodInQualifiedType(Selector Sel,const ObjCObjectPointerType * OPT,bool Instance)1740 ObjCMethodDecl *Sema::LookupMethodInQualifiedType(Selector Sel,
1741 const ObjCObjectPointerType *OPT,
1742 bool Instance)
1743 {
1744 ObjCMethodDecl *MD = nullptr;
1745 for (const auto *PROTO : OPT->quals()) {
1746 if ((MD = PROTO->lookupMethod(Sel, Instance))) {
1747 return MD;
1748 }
1749 }
1750 return nullptr;
1751 }
1752
1753 /// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an
1754 /// objective C interface. This is a property reference expression.
1755 ExprResult Sema::
HandleExprPropertyRefExpr(const ObjCObjectPointerType * OPT,Expr * BaseExpr,SourceLocation OpLoc,DeclarationName MemberName,SourceLocation MemberLoc,SourceLocation SuperLoc,QualType SuperType,bool Super)1756 HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT,
1757 Expr *BaseExpr, SourceLocation OpLoc,
1758 DeclarationName MemberName,
1759 SourceLocation MemberLoc,
1760 SourceLocation SuperLoc, QualType SuperType,
1761 bool Super) {
1762 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType();
1763 ObjCInterfaceDecl *IFace = IFaceT->getDecl();
1764
1765 if (!MemberName.isIdentifier()) {
1766 Diag(MemberLoc, diag::err_invalid_property_name)
1767 << MemberName << QualType(OPT, 0);
1768 return ExprError();
1769 }
1770
1771 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1772
1773 SourceRange BaseRange = Super? SourceRange(SuperLoc)
1774 : BaseExpr->getSourceRange();
1775 if (RequireCompleteType(MemberLoc, OPT->getPointeeType(),
1776 diag::err_property_not_found_forward_class,
1777 MemberName, BaseRange))
1778 return ExprError();
1779
1780 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(
1781 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1782 // Check whether we can reference this property.
1783 if (DiagnoseUseOfDecl(PD, MemberLoc))
1784 return ExprError();
1785 if (Super)
1786 return new (Context)
1787 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1788 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1789 else
1790 return new (Context)
1791 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1792 OK_ObjCProperty, MemberLoc, BaseExpr);
1793 }
1794 // Check protocols on qualified interfaces.
1795 for (const auto *I : OPT->quals())
1796 if (ObjCPropertyDecl *PD = I->FindPropertyDeclaration(
1797 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1798 // Check whether we can reference this property.
1799 if (DiagnoseUseOfDecl(PD, MemberLoc))
1800 return ExprError();
1801
1802 if (Super)
1803 return new (Context) ObjCPropertyRefExpr(
1804 PD, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty, MemberLoc,
1805 SuperLoc, SuperType);
1806 else
1807 return new (Context)
1808 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue,
1809 OK_ObjCProperty, MemberLoc, BaseExpr);
1810 }
1811 // If that failed, look for an "implicit" property by seeing if the nullary
1812 // selector is implemented.
1813
1814 // FIXME: The logic for looking up nullary and unary selectors should be
1815 // shared with the code in ActOnInstanceMessage.
1816
1817 Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
1818 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
1819
1820 // May be found in property's qualified list.
1821 if (!Getter)
1822 Getter = LookupMethodInQualifiedType(Sel, OPT, true);
1823
1824 // If this reference is in an @implementation, check for 'private' methods.
1825 if (!Getter)
1826 Getter = IFace->lookupPrivateMethod(Sel);
1827
1828 if (Getter) {
1829 // Check if we can reference this property.
1830 if (DiagnoseUseOfDecl(Getter, MemberLoc))
1831 return ExprError();
1832 }
1833 // If we found a getter then this may be a valid dot-reference, we
1834 // will look for the matching setter, in case it is needed.
1835 Selector SetterSel =
1836 SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
1837 PP.getSelectorTable(), Member);
1838 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel);
1839
1840 // May be found in property's qualified list.
1841 if (!Setter)
1842 Setter = LookupMethodInQualifiedType(SetterSel, OPT, true);
1843
1844 if (!Setter) {
1845 // If this reference is in an @implementation, also check for 'private'
1846 // methods.
1847 Setter = IFace->lookupPrivateMethod(SetterSel);
1848 }
1849
1850 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
1851 return ExprError();
1852
1853 // Special warning if member name used in a property-dot for a setter accessor
1854 // does not use a property with same name; e.g. obj.X = ... for a property with
1855 // name 'x'.
1856 if (Setter && Setter->isImplicit() && Setter->isPropertyAccessor() &&
1857 !IFace->FindPropertyDeclaration(
1858 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) {
1859 if (const ObjCPropertyDecl *PDecl = Setter->findPropertyDecl()) {
1860 // Do not warn if user is using property-dot syntax to make call to
1861 // user named setter.
1862 if (!(PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter))
1863 Diag(MemberLoc,
1864 diag::warn_property_access_suggest)
1865 << MemberName << QualType(OPT, 0) << PDecl->getName()
1866 << FixItHint::CreateReplacement(MemberLoc, PDecl->getName());
1867 }
1868 }
1869
1870 if (Getter || Setter) {
1871 if (Super)
1872 return new (Context)
1873 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1874 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType);
1875 else
1876 return new (Context)
1877 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
1878 OK_ObjCProperty, MemberLoc, BaseExpr);
1879
1880 }
1881
1882 // Attempt to correct for typos in property names.
1883 if (TypoCorrection Corrected =
1884 CorrectTypo(DeclarationNameInfo(MemberName, MemberLoc),
1885 LookupOrdinaryName, nullptr, nullptr,
1886 llvm::make_unique<DeclFilterCCC<ObjCPropertyDecl>>(),
1887 CTK_ErrorRecovery, IFace, false, OPT)) {
1888 DeclarationName TypoResult = Corrected.getCorrection();
1889 if (TypoResult.isIdentifier() &&
1890 TypoResult.getAsIdentifierInfo() == Member) {
1891 // There is no need to try the correction if it is the same.
1892 NamedDecl *ChosenDecl =
1893 Corrected.isKeyword() ? nullptr : Corrected.getFoundDecl();
1894 if (ChosenDecl && isa<ObjCPropertyDecl>(ChosenDecl))
1895 if (cast<ObjCPropertyDecl>(ChosenDecl)->isClassProperty()) {
1896 // This is a class property, we should not use the instance to
1897 // access it.
1898 Diag(MemberLoc, diag::err_class_property_found) << MemberName
1899 << OPT->getInterfaceDecl()->getName()
1900 << FixItHint::CreateReplacement(BaseExpr->getSourceRange(),
1901 OPT->getInterfaceDecl()->getName());
1902 return ExprError();
1903 }
1904 } else {
1905 diagnoseTypo(Corrected, PDiag(diag::err_property_not_found_suggest)
1906 << MemberName << QualType(OPT, 0));
1907 return HandleExprPropertyRefExpr(OPT, BaseExpr, OpLoc,
1908 TypoResult, MemberLoc,
1909 SuperLoc, SuperType, Super);
1910 }
1911 }
1912 ObjCInterfaceDecl *ClassDeclared;
1913 if (ObjCIvarDecl *Ivar =
1914 IFace->lookupInstanceVariable(Member, ClassDeclared)) {
1915 QualType T = Ivar->getType();
1916 if (const ObjCObjectPointerType * OBJPT =
1917 T->getAsObjCInterfacePointerType()) {
1918 if (RequireCompleteType(MemberLoc, OBJPT->getPointeeType(),
1919 diag::err_property_not_as_forward_class,
1920 MemberName, BaseExpr))
1921 return ExprError();
1922 }
1923 Diag(MemberLoc,
1924 diag::err_ivar_access_using_property_syntax_suggest)
1925 << MemberName << QualType(OPT, 0) << Ivar->getDeclName()
1926 << FixItHint::CreateReplacement(OpLoc, "->");
1927 return ExprError();
1928 }
1929
1930 Diag(MemberLoc, diag::err_property_not_found)
1931 << MemberName << QualType(OPT, 0);
1932 if (Setter)
1933 Diag(Setter->getLocation(), diag::note_getter_unavailable)
1934 << MemberName << BaseExpr->getSourceRange();
1935 return ExprError();
1936 }
1937
1938 ExprResult Sema::
ActOnClassPropertyRefExpr(IdentifierInfo & receiverName,IdentifierInfo & propertyName,SourceLocation receiverNameLoc,SourceLocation propertyNameLoc)1939 ActOnClassPropertyRefExpr(IdentifierInfo &receiverName,
1940 IdentifierInfo &propertyName,
1941 SourceLocation receiverNameLoc,
1942 SourceLocation propertyNameLoc) {
1943
1944 IdentifierInfo *receiverNamePtr = &receiverName;
1945 ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr,
1946 receiverNameLoc);
1947
1948 QualType SuperType;
1949 if (!IFace) {
1950 // If the "receiver" is 'super' in a method, handle it as an expression-like
1951 // property reference.
1952 if (receiverNamePtr->isStr("super")) {
1953 if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf(receiverNameLoc)) {
1954 if (auto classDecl = CurMethod->getClassInterface()) {
1955 SuperType = QualType(classDecl->getSuperClassType(), 0);
1956 if (CurMethod->isInstanceMethod()) {
1957 if (SuperType.isNull()) {
1958 // The current class does not have a superclass.
1959 Diag(receiverNameLoc, diag::error_root_class_cannot_use_super)
1960 << CurMethod->getClassInterface()->getIdentifier();
1961 return ExprError();
1962 }
1963 QualType T = Context.getObjCObjectPointerType(SuperType);
1964
1965 return HandleExprPropertyRefExpr(T->castAs<ObjCObjectPointerType>(),
1966 /*BaseExpr*/nullptr,
1967 SourceLocation()/*OpLoc*/,
1968 &propertyName,
1969 propertyNameLoc,
1970 receiverNameLoc, T, true);
1971 }
1972
1973 // Otherwise, if this is a class method, try dispatching to our
1974 // superclass.
1975 IFace = CurMethod->getClassInterface()->getSuperClass();
1976 }
1977 }
1978 }
1979
1980 if (!IFace) {
1981 Diag(receiverNameLoc, diag::err_expected_either) << tok::identifier
1982 << tok::l_paren;
1983 return ExprError();
1984 }
1985 }
1986
1987 // Search for a declared property first.
1988 Selector Sel = PP.getSelectorTable().getNullarySelector(&propertyName);
1989 ObjCMethodDecl *Getter = IFace->lookupClassMethod(Sel);
1990
1991 // If this reference is in an @implementation, check for 'private' methods.
1992 if (!Getter)
1993 Getter = IFace->lookupPrivateClassMethod(Sel);
1994
1995 if (Getter) {
1996 // FIXME: refactor/share with ActOnMemberReference().
1997 // Check if we can reference this property.
1998 if (DiagnoseUseOfDecl(Getter, propertyNameLoc))
1999 return ExprError();
2000 }
2001
2002 // Look for the matching setter, in case it is needed.
2003 Selector SetterSel =
2004 SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
2005 PP.getSelectorTable(),
2006 &propertyName);
2007
2008 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
2009 if (!Setter) {
2010 // If this reference is in an @implementation, also check for 'private'
2011 // methods.
2012 Setter = IFace->lookupPrivateClassMethod(SetterSel);
2013 }
2014 // Look through local category implementations associated with the class.
2015 if (!Setter)
2016 Setter = IFace->getCategoryClassMethod(SetterSel);
2017
2018 if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc))
2019 return ExprError();
2020
2021 if (Getter || Setter) {
2022 if (!SuperType.isNull())
2023 return new (Context)
2024 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue,
2025 OK_ObjCProperty, propertyNameLoc, receiverNameLoc,
2026 SuperType);
2027
2028 return new (Context) ObjCPropertyRefExpr(
2029 Getter, Setter, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty,
2030 propertyNameLoc, receiverNameLoc, IFace);
2031 }
2032 return ExprError(Diag(propertyNameLoc, diag::err_property_not_found)
2033 << &propertyName << Context.getObjCInterfaceType(IFace));
2034 }
2035
2036 namespace {
2037
2038 class ObjCInterfaceOrSuperCCC : public CorrectionCandidateCallback {
2039 public:
ObjCInterfaceOrSuperCCC(ObjCMethodDecl * Method)2040 ObjCInterfaceOrSuperCCC(ObjCMethodDecl *Method) {
2041 // Determine whether "super" is acceptable in the current context.
2042 if (Method && Method->getClassInterface())
2043 WantObjCSuper = Method->getClassInterface()->getSuperClass();
2044 }
2045
ValidateCandidate(const TypoCorrection & candidate)2046 bool ValidateCandidate(const TypoCorrection &candidate) override {
2047 return candidate.getCorrectionDeclAs<ObjCInterfaceDecl>() ||
2048 candidate.isKeyword("super");
2049 }
2050 };
2051
2052 } // end anonymous namespace
2053
getObjCMessageKind(Scope * S,IdentifierInfo * Name,SourceLocation NameLoc,bool IsSuper,bool HasTrailingDot,ParsedType & ReceiverType)2054 Sema::ObjCMessageKind Sema::getObjCMessageKind(Scope *S,
2055 IdentifierInfo *Name,
2056 SourceLocation NameLoc,
2057 bool IsSuper,
2058 bool HasTrailingDot,
2059 ParsedType &ReceiverType) {
2060 ReceiverType = nullptr;
2061
2062 // If the identifier is "super" and there is no trailing dot, we're
2063 // messaging super. If the identifier is "super" and there is a
2064 // trailing dot, it's an instance message.
2065 if (IsSuper && S->isInObjcMethodScope())
2066 return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage;
2067
2068 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
2069 LookupName(Result, S);
2070
2071 switch (Result.getResultKind()) {
2072 case LookupResult::NotFound:
2073 // Normal name lookup didn't find anything. If we're in an
2074 // Objective-C method, look for ivars. If we find one, we're done!
2075 // FIXME: This is a hack. Ivar lookup should be part of normal
2076 // lookup.
2077 if (ObjCMethodDecl *Method = getCurMethodDecl()) {
2078 if (!Method->getClassInterface()) {
2079 // Fall back: let the parser try to parse it as an instance message.
2080 return ObjCInstanceMessage;
2081 }
2082
2083 ObjCInterfaceDecl *ClassDeclared;
2084 if (Method->getClassInterface()->lookupInstanceVariable(Name,
2085 ClassDeclared))
2086 return ObjCInstanceMessage;
2087 }
2088
2089 // Break out; we'll perform typo correction below.
2090 break;
2091
2092 case LookupResult::NotFoundInCurrentInstantiation:
2093 case LookupResult::FoundOverloaded:
2094 case LookupResult::FoundUnresolvedValue:
2095 case LookupResult::Ambiguous:
2096 Result.suppressDiagnostics();
2097 return ObjCInstanceMessage;
2098
2099 case LookupResult::Found: {
2100 // If the identifier is a class or not, and there is a trailing dot,
2101 // it's an instance message.
2102 if (HasTrailingDot)
2103 return ObjCInstanceMessage;
2104 // We found something. If it's a type, then we have a class
2105 // message. Otherwise, it's an instance message.
2106 NamedDecl *ND = Result.getFoundDecl();
2107 QualType T;
2108 if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND))
2109 T = Context.getObjCInterfaceType(Class);
2110 else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND)) {
2111 T = Context.getTypeDeclType(Type);
2112 DiagnoseUseOfDecl(Type, NameLoc);
2113 }
2114 else
2115 return ObjCInstanceMessage;
2116
2117 // We have a class message, and T is the type we're
2118 // messaging. Build source-location information for it.
2119 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2120 ReceiverType = CreateParsedType(T, TSInfo);
2121 return ObjCClassMessage;
2122 }
2123 }
2124
2125 if (TypoCorrection Corrected = CorrectTypo(
2126 Result.getLookupNameInfo(), Result.getLookupKind(), S, nullptr,
2127 llvm::make_unique<ObjCInterfaceOrSuperCCC>(getCurMethodDecl()),
2128 CTK_ErrorRecovery, nullptr, false, nullptr, false)) {
2129 if (Corrected.isKeyword()) {
2130 // If we've found the keyword "super" (the only keyword that would be
2131 // returned by CorrectTypo), this is a send to super.
2132 diagnoseTypo(Corrected,
2133 PDiag(diag::err_unknown_receiver_suggest) << Name);
2134 return ObjCSuperMessage;
2135 } else if (ObjCInterfaceDecl *Class =
2136 Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>()) {
2137 // If we found a declaration, correct when it refers to an Objective-C
2138 // class.
2139 diagnoseTypo(Corrected,
2140 PDiag(diag::err_unknown_receiver_suggest) << Name);
2141 QualType T = Context.getObjCInterfaceType(Class);
2142 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
2143 ReceiverType = CreateParsedType(T, TSInfo);
2144 return ObjCClassMessage;
2145 }
2146 }
2147
2148 // Fall back: let the parser try to parse it as an instance message.
2149 return ObjCInstanceMessage;
2150 }
2151
ActOnSuperMessage(Scope * S,SourceLocation SuperLoc,Selector Sel,SourceLocation LBracLoc,ArrayRef<SourceLocation> SelectorLocs,SourceLocation RBracLoc,MultiExprArg Args)2152 ExprResult Sema::ActOnSuperMessage(Scope *S,
2153 SourceLocation SuperLoc,
2154 Selector Sel,
2155 SourceLocation LBracLoc,
2156 ArrayRef<SourceLocation> SelectorLocs,
2157 SourceLocation RBracLoc,
2158 MultiExprArg Args) {
2159 // Determine whether we are inside a method or not.
2160 ObjCMethodDecl *Method = tryCaptureObjCSelf(SuperLoc);
2161 if (!Method) {
2162 Diag(SuperLoc, diag::err_invalid_receiver_to_message_super);
2163 return ExprError();
2164 }
2165
2166 ObjCInterfaceDecl *Class = Method->getClassInterface();
2167 if (!Class) {
2168 Diag(SuperLoc, diag::error_no_super_class_message)
2169 << Method->getDeclName();
2170 return ExprError();
2171 }
2172
2173 QualType SuperTy(Class->getSuperClassType(), 0);
2174 if (SuperTy.isNull()) {
2175 // The current class does not have a superclass.
2176 Diag(SuperLoc, diag::error_root_class_cannot_use_super)
2177 << Class->getIdentifier();
2178 return ExprError();
2179 }
2180
2181 // We are in a method whose class has a superclass, so 'super'
2182 // is acting as a keyword.
2183 if (Method->getSelector() == Sel)
2184 getCurFunction()->ObjCShouldCallSuper = false;
2185
2186 if (Method->isInstanceMethod()) {
2187 // Since we are in an instance method, this is an instance
2188 // message to the superclass instance.
2189 SuperTy = Context.getObjCObjectPointerType(SuperTy);
2190 return BuildInstanceMessage(nullptr, SuperTy, SuperLoc,
2191 Sel, /*Method=*/nullptr,
2192 LBracLoc, SelectorLocs, RBracLoc, Args);
2193 }
2194
2195 // Since we are in a class method, this is a class message to
2196 // the superclass.
2197 return BuildClassMessage(/*ReceiverTypeInfo=*/nullptr,
2198 SuperTy,
2199 SuperLoc, Sel, /*Method=*/nullptr,
2200 LBracLoc, SelectorLocs, RBracLoc, Args);
2201 }
2202
BuildClassMessageImplicit(QualType ReceiverType,bool isSuperReceiver,SourceLocation Loc,Selector Sel,ObjCMethodDecl * Method,MultiExprArg Args)2203 ExprResult Sema::BuildClassMessageImplicit(QualType ReceiverType,
2204 bool isSuperReceiver,
2205 SourceLocation Loc,
2206 Selector Sel,
2207 ObjCMethodDecl *Method,
2208 MultiExprArg Args) {
2209 TypeSourceInfo *receiverTypeInfo = nullptr;
2210 if (!ReceiverType.isNull())
2211 receiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType);
2212
2213 return BuildClassMessage(receiverTypeInfo, ReceiverType,
2214 /*SuperLoc=*/isSuperReceiver ? Loc : SourceLocation(),
2215 Sel, Method, Loc, Loc, Loc, Args,
2216 /*isImplicit=*/true);
2217 }
2218
applyCocoaAPICheck(Sema & S,const ObjCMessageExpr * Msg,unsigned DiagID,bool (* refactor)(const ObjCMessageExpr *,const NSAPI &,edit::Commit &))2219 static void applyCocoaAPICheck(Sema &S, const ObjCMessageExpr *Msg,
2220 unsigned DiagID,
2221 bool (*refactor)(const ObjCMessageExpr *,
2222 const NSAPI &, edit::Commit &)) {
2223 SourceLocation MsgLoc = Msg->getExprLoc();
2224 if (S.Diags.isIgnored(DiagID, MsgLoc))
2225 return;
2226
2227 SourceManager &SM = S.SourceMgr;
2228 edit::Commit ECommit(SM, S.LangOpts);
2229 if (refactor(Msg,*S.NSAPIObj, ECommit)) {
2230 DiagnosticBuilder Builder = S.Diag(MsgLoc, DiagID)
2231 << Msg->getSelector() << Msg->getSourceRange();
2232 // FIXME: Don't emit diagnostic at all if fixits are non-commitable.
2233 if (!ECommit.isCommitable())
2234 return;
2235 for (edit::Commit::edit_iterator
2236 I = ECommit.edit_begin(), E = ECommit.edit_end(); I != E; ++I) {
2237 const edit::Commit::Edit &Edit = *I;
2238 switch (Edit.Kind) {
2239 case edit::Commit::Act_Insert:
2240 Builder.AddFixItHint(FixItHint::CreateInsertion(Edit.OrigLoc,
2241 Edit.Text,
2242 Edit.BeforePrev));
2243 break;
2244 case edit::Commit::Act_InsertFromRange:
2245 Builder.AddFixItHint(
2246 FixItHint::CreateInsertionFromRange(Edit.OrigLoc,
2247 Edit.getInsertFromRange(SM),
2248 Edit.BeforePrev));
2249 break;
2250 case edit::Commit::Act_Remove:
2251 Builder.AddFixItHint(FixItHint::CreateRemoval(Edit.getFileRange(SM)));
2252 break;
2253 }
2254 }
2255 }
2256 }
2257
checkCocoaAPI(Sema & S,const ObjCMessageExpr * Msg)2258 static void checkCocoaAPI(Sema &S, const ObjCMessageExpr *Msg) {
2259 applyCocoaAPICheck(S, Msg, diag::warn_objc_redundant_literal_use,
2260 edit::rewriteObjCRedundantCallWithLiteral);
2261 }
2262
2263 /// \brief Diagnose use of %s directive in an NSString which is being passed
2264 /// as formatting string to formatting method.
2265 static void
DiagnoseCStringFormatDirectiveInObjCAPI(Sema & S,ObjCMethodDecl * Method,Selector Sel,Expr ** Args,unsigned NumArgs)2266 DiagnoseCStringFormatDirectiveInObjCAPI(Sema &S,
2267 ObjCMethodDecl *Method,
2268 Selector Sel,
2269 Expr **Args, unsigned NumArgs) {
2270 unsigned Idx = 0;
2271 bool Format = false;
2272 ObjCStringFormatFamily SFFamily = Sel.getStringFormatFamily();
2273 if (SFFamily == ObjCStringFormatFamily::SFF_NSString) {
2274 Idx = 0;
2275 Format = true;
2276 }
2277 else if (Method) {
2278 for (const auto *I : Method->specific_attrs<FormatAttr>()) {
2279 if (S.GetFormatNSStringIdx(I, Idx)) {
2280 Format = true;
2281 break;
2282 }
2283 }
2284 }
2285 if (!Format || NumArgs <= Idx)
2286 return;
2287
2288 Expr *FormatExpr = Args[Idx];
2289 if (ObjCStringLiteral *OSL =
2290 dyn_cast<ObjCStringLiteral>(FormatExpr->IgnoreParenImpCasts())) {
2291 StringLiteral *FormatString = OSL->getString();
2292 if (S.FormatStringHasSArg(FormatString)) {
2293 S.Diag(FormatExpr->getExprLoc(), diag::warn_objc_cdirective_format_string)
2294 << "%s" << 0 << 0;
2295 if (Method)
2296 S.Diag(Method->getLocation(), diag::note_method_declared_at)
2297 << Method->getDeclName();
2298 }
2299 }
2300 }
2301
2302 /// \brief Build an Objective-C class message expression.
2303 ///
2304 /// This routine takes care of both normal class messages and
2305 /// class messages to the superclass.
2306 ///
2307 /// \param ReceiverTypeInfo Type source information that describes the
2308 /// receiver of this message. This may be NULL, in which case we are
2309 /// sending to the superclass and \p SuperLoc must be a valid source
2310 /// location.
2311
2312 /// \param ReceiverType The type of the object receiving the
2313 /// message. When \p ReceiverTypeInfo is non-NULL, this is the same
2314 /// type as that refers to. For a superclass send, this is the type of
2315 /// the superclass.
2316 ///
2317 /// \param SuperLoc The location of the "super" keyword in a
2318 /// superclass message.
2319 ///
2320 /// \param Sel The selector to which the message is being sent.
2321 ///
2322 /// \param Method The method that this class message is invoking, if
2323 /// already known.
2324 ///
2325 /// \param LBracLoc The location of the opening square bracket ']'.
2326 ///
2327 /// \param RBracLoc The location of the closing square bracket ']'.
2328 ///
2329 /// \param ArgsIn The message arguments.
BuildClassMessage(TypeSourceInfo * ReceiverTypeInfo,QualType ReceiverType,SourceLocation SuperLoc,Selector Sel,ObjCMethodDecl * Method,SourceLocation LBracLoc,ArrayRef<SourceLocation> SelectorLocs,SourceLocation RBracLoc,MultiExprArg ArgsIn,bool isImplicit)2330 ExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo,
2331 QualType ReceiverType,
2332 SourceLocation SuperLoc,
2333 Selector Sel,
2334 ObjCMethodDecl *Method,
2335 SourceLocation LBracLoc,
2336 ArrayRef<SourceLocation> SelectorLocs,
2337 SourceLocation RBracLoc,
2338 MultiExprArg ArgsIn,
2339 bool isImplicit) {
2340 SourceLocation Loc = SuperLoc.isValid()? SuperLoc
2341 : ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin();
2342 if (LBracLoc.isInvalid()) {
2343 Diag(Loc, diag::err_missing_open_square_message_send)
2344 << FixItHint::CreateInsertion(Loc, "[");
2345 LBracLoc = Loc;
2346 }
2347 SourceLocation SelLoc;
2348 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2349 SelLoc = SelectorLocs.front();
2350 else
2351 SelLoc = Loc;
2352
2353 if (ReceiverType->isDependentType()) {
2354 // If the receiver type is dependent, we can't type-check anything
2355 // at this point. Build a dependent expression.
2356 unsigned NumArgs = ArgsIn.size();
2357 Expr **Args = ArgsIn.data();
2358 assert(SuperLoc.isInvalid() && "Message to super with dependent type");
2359 return ObjCMessageExpr::Create(
2360 Context, ReceiverType, VK_RValue, LBracLoc, ReceiverTypeInfo, Sel,
2361 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs), RBracLoc,
2362 isImplicit);
2363 }
2364
2365 // Find the class to which we are sending this message.
2366 ObjCInterfaceDecl *Class = nullptr;
2367 const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>();
2368 if (!ClassType || !(Class = ClassType->getInterface())) {
2369 Diag(Loc, diag::err_invalid_receiver_class_message)
2370 << ReceiverType;
2371 return ExprError();
2372 }
2373 assert(Class && "We don't know which class we're messaging?");
2374 // objc++ diagnoses during typename annotation.
2375 if (!getLangOpts().CPlusPlus)
2376 (void)DiagnoseUseOfDecl(Class, SelLoc);
2377 // Find the method we are messaging.
2378 if (!Method) {
2379 SourceRange TypeRange
2380 = SuperLoc.isValid()? SourceRange(SuperLoc)
2381 : ReceiverTypeInfo->getTypeLoc().getSourceRange();
2382 if (RequireCompleteType(Loc, Context.getObjCInterfaceType(Class),
2383 (getLangOpts().ObjCAutoRefCount
2384 ? diag::err_arc_receiver_forward_class
2385 : diag::warn_receiver_forward_class),
2386 TypeRange)) {
2387 // A forward class used in messaging is treated as a 'Class'
2388 Method = LookupFactoryMethodInGlobalPool(Sel,
2389 SourceRange(LBracLoc, RBracLoc));
2390 if (Method && !getLangOpts().ObjCAutoRefCount)
2391 Diag(Method->getLocation(), diag::note_method_sent_forward_class)
2392 << Method->getDeclName();
2393 }
2394 if (!Method)
2395 Method = Class->lookupClassMethod(Sel);
2396
2397 // If we have an implementation in scope, check "private" methods.
2398 if (!Method)
2399 Method = Class->lookupPrivateClassMethod(Sel);
2400
2401 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2402 return ExprError();
2403 }
2404
2405 // Check the argument types and determine the result type.
2406 QualType ReturnType;
2407 ExprValueKind VK = VK_RValue;
2408
2409 unsigned NumArgs = ArgsIn.size();
2410 Expr **Args = ArgsIn.data();
2411 if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2412 Sel, SelectorLocs,
2413 Method, true,
2414 SuperLoc.isValid(), LBracLoc, RBracLoc,
2415 SourceRange(),
2416 ReturnType, VK))
2417 return ExprError();
2418
2419 if (Method && !Method->getReturnType()->isVoidType() &&
2420 RequireCompleteType(LBracLoc, Method->getReturnType(),
2421 diag::err_illegal_message_expr_incomplete_type))
2422 return ExprError();
2423
2424 // Warn about explicit call of +initialize on its own class. But not on 'super'.
2425 if (Method && Method->getMethodFamily() == OMF_initialize) {
2426 if (!SuperLoc.isValid()) {
2427 const ObjCInterfaceDecl *ID =
2428 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext());
2429 if (ID == Class) {
2430 Diag(Loc, diag::warn_direct_initialize_call);
2431 Diag(Method->getLocation(), diag::note_method_declared_at)
2432 << Method->getDeclName();
2433 }
2434 }
2435 else if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2436 // [super initialize] is allowed only within an +initialize implementation
2437 if (CurMeth->getMethodFamily() != OMF_initialize) {
2438 Diag(Loc, diag::warn_direct_super_initialize_call);
2439 Diag(Method->getLocation(), diag::note_method_declared_at)
2440 << Method->getDeclName();
2441 Diag(CurMeth->getLocation(), diag::note_method_declared_at)
2442 << CurMeth->getDeclName();
2443 }
2444 }
2445 }
2446
2447 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
2448
2449 // Construct the appropriate ObjCMessageExpr.
2450 ObjCMessageExpr *Result;
2451 if (SuperLoc.isValid())
2452 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2453 SuperLoc, /*IsInstanceSuper=*/false,
2454 ReceiverType, Sel, SelectorLocs,
2455 Method, makeArrayRef(Args, NumArgs),
2456 RBracLoc, isImplicit);
2457 else {
2458 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2459 ReceiverTypeInfo, Sel, SelectorLocs,
2460 Method, makeArrayRef(Args, NumArgs),
2461 RBracLoc, isImplicit);
2462 if (!isImplicit)
2463 checkCocoaAPI(*this, Result);
2464 }
2465 return MaybeBindToTemporary(Result);
2466 }
2467
2468 // ActOnClassMessage - used for both unary and keyword messages.
2469 // ArgExprs is optional - if it is present, the number of expressions
2470 // is obtained from Sel.getNumArgs().
ActOnClassMessage(Scope * S,ParsedType Receiver,Selector Sel,SourceLocation LBracLoc,ArrayRef<SourceLocation> SelectorLocs,SourceLocation RBracLoc,MultiExprArg Args)2471 ExprResult Sema::ActOnClassMessage(Scope *S,
2472 ParsedType Receiver,
2473 Selector Sel,
2474 SourceLocation LBracLoc,
2475 ArrayRef<SourceLocation> SelectorLocs,
2476 SourceLocation RBracLoc,
2477 MultiExprArg Args) {
2478 TypeSourceInfo *ReceiverTypeInfo;
2479 QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo);
2480 if (ReceiverType.isNull())
2481 return ExprError();
2482
2483 if (!ReceiverTypeInfo)
2484 ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc);
2485
2486 return BuildClassMessage(ReceiverTypeInfo, ReceiverType,
2487 /*SuperLoc=*/SourceLocation(), Sel,
2488 /*Method=*/nullptr, LBracLoc, SelectorLocs, RBracLoc,
2489 Args);
2490 }
2491
BuildInstanceMessageImplicit(Expr * Receiver,QualType ReceiverType,SourceLocation Loc,Selector Sel,ObjCMethodDecl * Method,MultiExprArg Args)2492 ExprResult Sema::BuildInstanceMessageImplicit(Expr *Receiver,
2493 QualType ReceiverType,
2494 SourceLocation Loc,
2495 Selector Sel,
2496 ObjCMethodDecl *Method,
2497 MultiExprArg Args) {
2498 return BuildInstanceMessage(Receiver, ReceiverType,
2499 /*SuperLoc=*/!Receiver ? Loc : SourceLocation(),
2500 Sel, Method, Loc, Loc, Loc, Args,
2501 /*isImplicit=*/true);
2502 }
2503
2504 /// \brief Build an Objective-C instance message expression.
2505 ///
2506 /// This routine takes care of both normal instance messages and
2507 /// instance messages to the superclass instance.
2508 ///
2509 /// \param Receiver The expression that computes the object that will
2510 /// receive this message. This may be empty, in which case we are
2511 /// sending to the superclass instance and \p SuperLoc must be a valid
2512 /// source location.
2513 ///
2514 /// \param ReceiverType The (static) type of the object receiving the
2515 /// message. When a \p Receiver expression is provided, this is the
2516 /// same type as that expression. For a superclass instance send, this
2517 /// is a pointer to the type of the superclass.
2518 ///
2519 /// \param SuperLoc The location of the "super" keyword in a
2520 /// superclass instance message.
2521 ///
2522 /// \param Sel The selector to which the message is being sent.
2523 ///
2524 /// \param Method The method that this instance message is invoking, if
2525 /// already known.
2526 ///
2527 /// \param LBracLoc The location of the opening square bracket ']'.
2528 ///
2529 /// \param RBracLoc The location of the closing square bracket ']'.
2530 ///
2531 /// \param ArgsIn The message arguments.
BuildInstanceMessage(Expr * Receiver,QualType ReceiverType,SourceLocation SuperLoc,Selector Sel,ObjCMethodDecl * Method,SourceLocation LBracLoc,ArrayRef<SourceLocation> SelectorLocs,SourceLocation RBracLoc,MultiExprArg ArgsIn,bool isImplicit)2532 ExprResult Sema::BuildInstanceMessage(Expr *Receiver,
2533 QualType ReceiverType,
2534 SourceLocation SuperLoc,
2535 Selector Sel,
2536 ObjCMethodDecl *Method,
2537 SourceLocation LBracLoc,
2538 ArrayRef<SourceLocation> SelectorLocs,
2539 SourceLocation RBracLoc,
2540 MultiExprArg ArgsIn,
2541 bool isImplicit) {
2542 // The location of the receiver.
2543 SourceLocation Loc = SuperLoc.isValid()? SuperLoc : Receiver->getLocStart();
2544 SourceRange RecRange =
2545 SuperLoc.isValid()? SuperLoc : Receiver->getSourceRange();
2546 SourceLocation SelLoc;
2547 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2548 SelLoc = SelectorLocs.front();
2549 else
2550 SelLoc = Loc;
2551
2552 if (LBracLoc.isInvalid()) {
2553 Diag(Loc, diag::err_missing_open_square_message_send)
2554 << FixItHint::CreateInsertion(Loc, "[");
2555 LBracLoc = Loc;
2556 }
2557
2558 // If we have a receiver expression, perform appropriate promotions
2559 // and determine receiver type.
2560 if (Receiver) {
2561 if (Receiver->hasPlaceholderType()) {
2562 ExprResult Result;
2563 if (Receiver->getType() == Context.UnknownAnyTy)
2564 Result = forceUnknownAnyToType(Receiver, Context.getObjCIdType());
2565 else
2566 Result = CheckPlaceholderExpr(Receiver);
2567 if (Result.isInvalid()) return ExprError();
2568 Receiver = Result.get();
2569 }
2570
2571 if (Receiver->isTypeDependent()) {
2572 // If the receiver is type-dependent, we can't type-check anything
2573 // at this point. Build a dependent expression.
2574 unsigned NumArgs = ArgsIn.size();
2575 Expr **Args = ArgsIn.data();
2576 assert(SuperLoc.isInvalid() && "Message to super with dependent type");
2577 return ObjCMessageExpr::Create(
2578 Context, Context.DependentTy, VK_RValue, LBracLoc, Receiver, Sel,
2579 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs),
2580 RBracLoc, isImplicit);
2581 }
2582
2583 // If necessary, apply function/array conversion to the receiver.
2584 // C99 6.7.5.3p[7,8].
2585 ExprResult Result = DefaultFunctionArrayLvalueConversion(Receiver);
2586 if (Result.isInvalid())
2587 return ExprError();
2588 Receiver = Result.get();
2589 ReceiverType = Receiver->getType();
2590
2591 // If the receiver is an ObjC pointer, a block pointer, or an
2592 // __attribute__((NSObject)) pointer, we don't need to do any
2593 // special conversion in order to look up a receiver.
2594 if (ReceiverType->isObjCRetainableType()) {
2595 // do nothing
2596 } else if (!getLangOpts().ObjCAutoRefCount &&
2597 !Context.getObjCIdType().isNull() &&
2598 (ReceiverType->isPointerType() ||
2599 ReceiverType->isIntegerType())) {
2600 // Implicitly convert integers and pointers to 'id' but emit a warning.
2601 // But not in ARC.
2602 Diag(Loc, diag::warn_bad_receiver_type)
2603 << ReceiverType
2604 << Receiver->getSourceRange();
2605 if (ReceiverType->isPointerType()) {
2606 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2607 CK_CPointerToObjCPointerCast).get();
2608 } else {
2609 // TODO: specialized warning on null receivers?
2610 bool IsNull = Receiver->isNullPointerConstant(Context,
2611 Expr::NPC_ValueDependentIsNull);
2612 CastKind Kind = IsNull ? CK_NullToPointer : CK_IntegralToPointer;
2613 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2614 Kind).get();
2615 }
2616 ReceiverType = Receiver->getType();
2617 } else if (getLangOpts().CPlusPlus) {
2618 // The receiver must be a complete type.
2619 if (RequireCompleteType(Loc, Receiver->getType(),
2620 diag::err_incomplete_receiver_type))
2621 return ExprError();
2622
2623 ExprResult result = PerformContextuallyConvertToObjCPointer(Receiver);
2624 if (result.isUsable()) {
2625 Receiver = result.get();
2626 ReceiverType = Receiver->getType();
2627 }
2628 }
2629 }
2630
2631 // There's a somewhat weird interaction here where we assume that we
2632 // won't actually have a method unless we also don't need to do some
2633 // of the more detailed type-checking on the receiver.
2634
2635 if (!Method) {
2636 // Handle messages to id and __kindof types (where we use the
2637 // global method pool).
2638 const ObjCObjectType *typeBound = nullptr;
2639 bool receiverIsIdLike = ReceiverType->isObjCIdOrObjectKindOfType(Context,
2640 typeBound);
2641 if (receiverIsIdLike || ReceiverType->isBlockPointerType() ||
2642 (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) {
2643 SmallVector<ObjCMethodDecl*, 4> Methods;
2644 // If we have a type bound, further filter the methods.
2645 CollectMultipleMethodsInGlobalPool(Sel, Methods, true/*InstanceFirst*/,
2646 true/*CheckTheOther*/, typeBound);
2647 if (!Methods.empty()) {
2648 // We chose the first method as the initial condidate, then try to
2649 // select a better one.
2650 Method = Methods[0];
2651
2652 if (ObjCMethodDecl *BestMethod =
2653 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(), Methods))
2654 Method = BestMethod;
2655
2656 if (!AreMultipleMethodsInGlobalPool(Sel, Method,
2657 SourceRange(LBracLoc, RBracLoc),
2658 receiverIsIdLike, Methods))
2659 DiagnoseUseOfDecl(Method, SelLoc);
2660 }
2661 } else if (ReceiverType->isObjCClassOrClassKindOfType() ||
2662 ReceiverType->isObjCQualifiedClassType()) {
2663 // Handle messages to Class.
2664 // We allow sending a message to a qualified Class ("Class<foo>"), which
2665 // is ok as long as one of the protocols implements the selector (if not,
2666 // warn).
2667 if (!ReceiverType->isObjCClassOrClassKindOfType()) {
2668 const ObjCObjectPointerType *QClassTy
2669 = ReceiverType->getAsObjCQualifiedClassType();
2670 // Search protocols for class methods.
2671 Method = LookupMethodInQualifiedType(Sel, QClassTy, false);
2672 if (!Method) {
2673 Method = LookupMethodInQualifiedType(Sel, QClassTy, true);
2674 // warn if instance method found for a Class message.
2675 if (Method) {
2676 Diag(SelLoc, diag::warn_instance_method_on_class_found)
2677 << Method->getSelector() << Sel;
2678 Diag(Method->getLocation(), diag::note_method_declared_at)
2679 << Method->getDeclName();
2680 }
2681 }
2682 } else {
2683 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2684 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) {
2685 // First check the public methods in the class interface.
2686 Method = ClassDecl->lookupClassMethod(Sel);
2687
2688 if (!Method)
2689 Method = ClassDecl->lookupPrivateClassMethod(Sel);
2690 }
2691 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2692 return ExprError();
2693 }
2694 if (!Method) {
2695 // If not messaging 'self', look for any factory method named 'Sel'.
2696 if (!Receiver || !isSelfExpr(Receiver)) {
2697 // If no class (factory) method was found, check if an _instance_
2698 // method of the same name exists in the root class only.
2699 SmallVector<ObjCMethodDecl*, 4> Methods;
2700 CollectMultipleMethodsInGlobalPool(Sel, Methods,
2701 false/*InstanceFirst*/,
2702 true/*CheckTheOther*/);
2703 if (!Methods.empty()) {
2704 // We chose the first method as the initial condidate, then try
2705 // to select a better one.
2706 Method = Methods[0];
2707
2708 // If we find an instance method, emit waring.
2709 if (Method->isInstanceMethod()) {
2710 if (const ObjCInterfaceDecl *ID =
2711 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) {
2712 if (ID->getSuperClass())
2713 Diag(SelLoc, diag::warn_root_inst_method_not_found)
2714 << Sel << SourceRange(LBracLoc, RBracLoc);
2715 }
2716 }
2717
2718 if (ObjCMethodDecl *BestMethod =
2719 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2720 Methods))
2721 Method = BestMethod;
2722 }
2723 }
2724 }
2725 }
2726 } else {
2727 ObjCInterfaceDecl *ClassDecl = nullptr;
2728
2729 // We allow sending a message to a qualified ID ("id<foo>"), which is ok as
2730 // long as one of the protocols implements the selector (if not, warn).
2731 // And as long as message is not deprecated/unavailable (warn if it is).
2732 if (const ObjCObjectPointerType *QIdTy
2733 = ReceiverType->getAsObjCQualifiedIdType()) {
2734 // Search protocols for instance methods.
2735 Method = LookupMethodInQualifiedType(Sel, QIdTy, true);
2736 if (!Method)
2737 Method = LookupMethodInQualifiedType(Sel, QIdTy, false);
2738 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2739 return ExprError();
2740 } else if (const ObjCObjectPointerType *OCIType
2741 = ReceiverType->getAsObjCInterfacePointerType()) {
2742 // We allow sending a message to a pointer to an interface (an object).
2743 ClassDecl = OCIType->getInterfaceDecl();
2744
2745 // Try to complete the type. Under ARC, this is a hard error from which
2746 // we don't try to recover.
2747 // FIXME: In the non-ARC case, this will still be a hard error if the
2748 // definition is found in a module that's not visible.
2749 const ObjCInterfaceDecl *forwardClass = nullptr;
2750 if (RequireCompleteType(Loc, OCIType->getPointeeType(),
2751 getLangOpts().ObjCAutoRefCount
2752 ? diag::err_arc_receiver_forward_instance
2753 : diag::warn_receiver_forward_instance,
2754 Receiver? Receiver->getSourceRange()
2755 : SourceRange(SuperLoc))) {
2756 if (getLangOpts().ObjCAutoRefCount)
2757 return ExprError();
2758
2759 forwardClass = OCIType->getInterfaceDecl();
2760 Diag(Receiver ? Receiver->getLocStart()
2761 : SuperLoc, diag::note_receiver_is_id);
2762 Method = nullptr;
2763 } else {
2764 Method = ClassDecl->lookupInstanceMethod(Sel);
2765 }
2766
2767 if (!Method)
2768 // Search protocol qualifiers.
2769 Method = LookupMethodInQualifiedType(Sel, OCIType, true);
2770
2771 if (!Method) {
2772 // If we have implementations in scope, check "private" methods.
2773 Method = ClassDecl->lookupPrivateMethod(Sel);
2774
2775 if (!Method && getLangOpts().ObjCAutoRefCount) {
2776 Diag(SelLoc, diag::err_arc_may_not_respond)
2777 << OCIType->getPointeeType() << Sel << RecRange
2778 << SourceRange(SelectorLocs.front(), SelectorLocs.back());
2779 return ExprError();
2780 }
2781
2782 if (!Method && (!Receiver || !isSelfExpr(Receiver))) {
2783 // If we still haven't found a method, look in the global pool. This
2784 // behavior isn't very desirable, however we need it for GCC
2785 // compatibility. FIXME: should we deviate??
2786 if (OCIType->qual_empty()) {
2787 SmallVector<ObjCMethodDecl*, 4> Methods;
2788 CollectMultipleMethodsInGlobalPool(Sel, Methods,
2789 true/*InstanceFirst*/,
2790 false/*CheckTheOther*/);
2791 if (!Methods.empty()) {
2792 // We chose the first method as the initial condidate, then try
2793 // to select a better one.
2794 Method = Methods[0];
2795
2796 if (ObjCMethodDecl *BestMethod =
2797 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(),
2798 Methods))
2799 Method = BestMethod;
2800
2801 AreMultipleMethodsInGlobalPool(Sel, Method,
2802 SourceRange(LBracLoc, RBracLoc),
2803 true/*receiverIdOrClass*/,
2804 Methods);
2805 }
2806 if (Method && !forwardClass)
2807 Diag(SelLoc, diag::warn_maynot_respond)
2808 << OCIType->getInterfaceDecl()->getIdentifier()
2809 << Sel << RecRange;
2810 }
2811 }
2812 }
2813 if (Method && DiagnoseUseOfDecl(Method, SelLoc, forwardClass))
2814 return ExprError();
2815 } else {
2816 // Reject other random receiver types (e.g. structs).
2817 Diag(Loc, diag::err_bad_receiver_type)
2818 << ReceiverType << Receiver->getSourceRange();
2819 return ExprError();
2820 }
2821 }
2822 }
2823
2824 FunctionScopeInfo *DIFunctionScopeInfo =
2825 (Method && Method->getMethodFamily() == OMF_init)
2826 ? getEnclosingFunction() : nullptr;
2827
2828 if (DIFunctionScopeInfo &&
2829 DIFunctionScopeInfo->ObjCIsDesignatedInit &&
2830 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2831 bool isDesignatedInitChain = false;
2832 if (SuperLoc.isValid()) {
2833 if (const ObjCObjectPointerType *
2834 OCIType = ReceiverType->getAsObjCInterfacePointerType()) {
2835 if (const ObjCInterfaceDecl *ID = OCIType->getInterfaceDecl()) {
2836 // Either we know this is a designated initializer or we
2837 // conservatively assume it because we don't know for sure.
2838 if (!ID->declaresOrInheritsDesignatedInitializers() ||
2839 ID->isDesignatedInitializer(Sel)) {
2840 isDesignatedInitChain = true;
2841 DIFunctionScopeInfo->ObjCWarnForNoDesignatedInitChain = false;
2842 }
2843 }
2844 }
2845 }
2846 if (!isDesignatedInitChain) {
2847 const ObjCMethodDecl *InitMethod = nullptr;
2848 bool isDesignated =
2849 getCurMethodDecl()->isDesignatedInitializerForTheInterface(&InitMethod);
2850 assert(isDesignated && InitMethod);
2851 (void)isDesignated;
2852 Diag(SelLoc, SuperLoc.isValid() ?
2853 diag::warn_objc_designated_init_non_designated_init_call :
2854 diag::warn_objc_designated_init_non_super_designated_init_call);
2855 Diag(InitMethod->getLocation(),
2856 diag::note_objc_designated_init_marked_here);
2857 }
2858 }
2859
2860 if (DIFunctionScopeInfo &&
2861 DIFunctionScopeInfo->ObjCIsSecondaryInit &&
2862 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2863 if (SuperLoc.isValid()) {
2864 Diag(SelLoc, diag::warn_objc_secondary_init_super_init_call);
2865 } else {
2866 DIFunctionScopeInfo->ObjCWarnForNoInitDelegation = false;
2867 }
2868 }
2869
2870 // Check the message arguments.
2871 unsigned NumArgs = ArgsIn.size();
2872 Expr **Args = ArgsIn.data();
2873 QualType ReturnType;
2874 ExprValueKind VK = VK_RValue;
2875 bool ClassMessage = (ReceiverType->isObjCClassType() ||
2876 ReceiverType->isObjCQualifiedClassType());
2877 if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2878 Sel, SelectorLocs, Method,
2879 ClassMessage, SuperLoc.isValid(),
2880 LBracLoc, RBracLoc, RecRange, ReturnType, VK))
2881 return ExprError();
2882
2883 if (Method && !Method->getReturnType()->isVoidType() &&
2884 RequireCompleteType(LBracLoc, Method->getReturnType(),
2885 diag::err_illegal_message_expr_incomplete_type))
2886 return ExprError();
2887
2888 // In ARC, forbid the user from sending messages to
2889 // retain/release/autorelease/dealloc/retainCount explicitly.
2890 if (getLangOpts().ObjCAutoRefCount) {
2891 ObjCMethodFamily family =
2892 (Method ? Method->getMethodFamily() : Sel.getMethodFamily());
2893 switch (family) {
2894 case OMF_init:
2895 if (Method)
2896 checkInitMethod(Method, ReceiverType);
2897
2898 case OMF_None:
2899 case OMF_alloc:
2900 case OMF_copy:
2901 case OMF_finalize:
2902 case OMF_mutableCopy:
2903 case OMF_new:
2904 case OMF_self:
2905 case OMF_initialize:
2906 break;
2907
2908 case OMF_dealloc:
2909 case OMF_retain:
2910 case OMF_release:
2911 case OMF_autorelease:
2912 case OMF_retainCount:
2913 Diag(SelLoc, diag::err_arc_illegal_explicit_message)
2914 << Sel << RecRange;
2915 break;
2916
2917 case OMF_performSelector:
2918 if (Method && NumArgs >= 1) {
2919 if (ObjCSelectorExpr *SelExp = dyn_cast<ObjCSelectorExpr>(Args[0])) {
2920 Selector ArgSel = SelExp->getSelector();
2921 ObjCMethodDecl *SelMethod =
2922 LookupInstanceMethodInGlobalPool(ArgSel,
2923 SelExp->getSourceRange());
2924 if (!SelMethod)
2925 SelMethod =
2926 LookupFactoryMethodInGlobalPool(ArgSel,
2927 SelExp->getSourceRange());
2928 if (SelMethod) {
2929 ObjCMethodFamily SelFamily = SelMethod->getMethodFamily();
2930 switch (SelFamily) {
2931 case OMF_alloc:
2932 case OMF_copy:
2933 case OMF_mutableCopy:
2934 case OMF_new:
2935 case OMF_self:
2936 case OMF_init:
2937 // Issue error, unless ns_returns_not_retained.
2938 if (!SelMethod->hasAttr<NSReturnsNotRetainedAttr>()) {
2939 // selector names a +1 method
2940 Diag(SelLoc,
2941 diag::err_arc_perform_selector_retains);
2942 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
2943 << SelMethod->getDeclName();
2944 }
2945 break;
2946 default:
2947 // +0 call. OK. unless ns_returns_retained.
2948 if (SelMethod->hasAttr<NSReturnsRetainedAttr>()) {
2949 // selector names a +1 method
2950 Diag(SelLoc,
2951 diag::err_arc_perform_selector_retains);
2952 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
2953 << SelMethod->getDeclName();
2954 }
2955 break;
2956 }
2957 }
2958 } else {
2959 // error (may leak).
2960 Diag(SelLoc, diag::warn_arc_perform_selector_leaks);
2961 Diag(Args[0]->getExprLoc(), diag::note_used_here);
2962 }
2963 }
2964 break;
2965 }
2966 }
2967
2968 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs);
2969
2970 // Construct the appropriate ObjCMessageExpr instance.
2971 ObjCMessageExpr *Result;
2972 if (SuperLoc.isValid())
2973 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2974 SuperLoc, /*IsInstanceSuper=*/true,
2975 ReceiverType, Sel, SelectorLocs, Method,
2976 makeArrayRef(Args, NumArgs), RBracLoc,
2977 isImplicit);
2978 else {
2979 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2980 Receiver, Sel, SelectorLocs, Method,
2981 makeArrayRef(Args, NumArgs), RBracLoc,
2982 isImplicit);
2983 if (!isImplicit)
2984 checkCocoaAPI(*this, Result);
2985 }
2986
2987 if (getLangOpts().ObjCAutoRefCount) {
2988 // In ARC, annotate delegate init calls.
2989 if (Result->getMethodFamily() == OMF_init &&
2990 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2991 // Only consider init calls *directly* in init implementations,
2992 // not within blocks.
2993 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(CurContext);
2994 if (method && method->getMethodFamily() == OMF_init) {
2995 // The implicit assignment to self means we also don't want to
2996 // consume the result.
2997 Result->setDelegateInitCall(true);
2998 return Result;
2999 }
3000 }
3001
3002 // In ARC, check for message sends which are likely to introduce
3003 // retain cycles.
3004 checkRetainCycles(Result);
3005
3006 if (!isImplicit && Method) {
3007 if (const ObjCPropertyDecl *Prop = Method->findPropertyDecl()) {
3008 bool IsWeak =
3009 Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak;
3010 if (!IsWeak && Sel.isUnarySelector())
3011 IsWeak = ReturnType.getObjCLifetime() & Qualifiers::OCL_Weak;
3012 if (IsWeak &&
3013 !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, LBracLoc))
3014 getCurFunction()->recordUseOfWeak(Result, Prop);
3015 }
3016 }
3017 }
3018
3019 CheckObjCCircularContainer(Result);
3020
3021 return MaybeBindToTemporary(Result);
3022 }
3023
RemoveSelectorFromWarningCache(Sema & S,Expr * Arg)3024 static void RemoveSelectorFromWarningCache(Sema &S, Expr* Arg) {
3025 if (ObjCSelectorExpr *OSE =
3026 dyn_cast<ObjCSelectorExpr>(Arg->IgnoreParenCasts())) {
3027 Selector Sel = OSE->getSelector();
3028 SourceLocation Loc = OSE->getAtLoc();
3029 auto Pos = S.ReferencedSelectors.find(Sel);
3030 if (Pos != S.ReferencedSelectors.end() && Pos->second == Loc)
3031 S.ReferencedSelectors.erase(Pos);
3032 }
3033 }
3034
3035 // ActOnInstanceMessage - used for both unary and keyword messages.
3036 // ArgExprs is optional - if it is present, the number of expressions
3037 // is obtained from Sel.getNumArgs().
ActOnInstanceMessage(Scope * S,Expr * Receiver,Selector Sel,SourceLocation LBracLoc,ArrayRef<SourceLocation> SelectorLocs,SourceLocation RBracLoc,MultiExprArg Args)3038 ExprResult Sema::ActOnInstanceMessage(Scope *S,
3039 Expr *Receiver,
3040 Selector Sel,
3041 SourceLocation LBracLoc,
3042 ArrayRef<SourceLocation> SelectorLocs,
3043 SourceLocation RBracLoc,
3044 MultiExprArg Args) {
3045 if (!Receiver)
3046 return ExprError();
3047
3048 // A ParenListExpr can show up while doing error recovery with invalid code.
3049 if (isa<ParenListExpr>(Receiver)) {
3050 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Receiver);
3051 if (Result.isInvalid()) return ExprError();
3052 Receiver = Result.get();
3053 }
3054
3055 if (RespondsToSelectorSel.isNull()) {
3056 IdentifierInfo *SelectorId = &Context.Idents.get("respondsToSelector");
3057 RespondsToSelectorSel = Context.Selectors.getUnarySelector(SelectorId);
3058 }
3059 if (Sel == RespondsToSelectorSel)
3060 RemoveSelectorFromWarningCache(*this, Args[0]);
3061
3062 return BuildInstanceMessage(Receiver, Receiver->getType(),
3063 /*SuperLoc=*/SourceLocation(), Sel,
3064 /*Method=*/nullptr, LBracLoc, SelectorLocs,
3065 RBracLoc, Args);
3066 }
3067
3068 enum ARCConversionTypeClass {
3069 /// int, void, struct A
3070 ACTC_none,
3071
3072 /// id, void (^)()
3073 ACTC_retainable,
3074
3075 /// id*, id***, void (^*)(),
3076 ACTC_indirectRetainable,
3077
3078 /// void* might be a normal C type, or it might a CF type.
3079 ACTC_voidPtr,
3080
3081 /// struct A*
3082 ACTC_coreFoundation
3083 };
3084
isAnyRetainable(ARCConversionTypeClass ACTC)3085 static bool isAnyRetainable(ARCConversionTypeClass ACTC) {
3086 return (ACTC == ACTC_retainable ||
3087 ACTC == ACTC_coreFoundation ||
3088 ACTC == ACTC_voidPtr);
3089 }
3090
isAnyCLike(ARCConversionTypeClass ACTC)3091 static bool isAnyCLike(ARCConversionTypeClass ACTC) {
3092 return ACTC == ACTC_none ||
3093 ACTC == ACTC_voidPtr ||
3094 ACTC == ACTC_coreFoundation;
3095 }
3096
classifyTypeForARCConversion(QualType type)3097 static ARCConversionTypeClass classifyTypeForARCConversion(QualType type) {
3098 bool isIndirect = false;
3099
3100 // Ignore an outermost reference type.
3101 if (const ReferenceType *ref = type->getAs<ReferenceType>()) {
3102 type = ref->getPointeeType();
3103 isIndirect = true;
3104 }
3105
3106 // Drill through pointers and arrays recursively.
3107 while (true) {
3108 if (const PointerType *ptr = type->getAs<PointerType>()) {
3109 type = ptr->getPointeeType();
3110
3111 // The first level of pointer may be the innermost pointer on a CF type.
3112 if (!isIndirect) {
3113 if (type->isVoidType()) return ACTC_voidPtr;
3114 if (type->isRecordType()) return ACTC_coreFoundation;
3115 }
3116 } else if (const ArrayType *array = type->getAsArrayTypeUnsafe()) {
3117 type = QualType(array->getElementType()->getBaseElementTypeUnsafe(), 0);
3118 } else {
3119 break;
3120 }
3121 isIndirect = true;
3122 }
3123
3124 if (isIndirect) {
3125 if (type->isObjCARCBridgableType())
3126 return ACTC_indirectRetainable;
3127 return ACTC_none;
3128 }
3129
3130 if (type->isObjCARCBridgableType())
3131 return ACTC_retainable;
3132
3133 return ACTC_none;
3134 }
3135
3136 namespace {
3137 /// A result from the cast checker.
3138 enum ACCResult {
3139 /// Cannot be casted.
3140 ACC_invalid,
3141
3142 /// Can be safely retained or not retained.
3143 ACC_bottom,
3144
3145 /// Can be casted at +0.
3146 ACC_plusZero,
3147
3148 /// Can be casted at +1.
3149 ACC_plusOne
3150 };
merge(ACCResult left,ACCResult right)3151 ACCResult merge(ACCResult left, ACCResult right) {
3152 if (left == right) return left;
3153 if (left == ACC_bottom) return right;
3154 if (right == ACC_bottom) return left;
3155 return ACC_invalid;
3156 }
3157
3158 /// A checker which white-lists certain expressions whose conversion
3159 /// to or from retainable type would otherwise be forbidden in ARC.
3160 class ARCCastChecker : public StmtVisitor<ARCCastChecker, ACCResult> {
3161 typedef StmtVisitor<ARCCastChecker, ACCResult> super;
3162
3163 ASTContext &Context;
3164 ARCConversionTypeClass SourceClass;
3165 ARCConversionTypeClass TargetClass;
3166 bool Diagnose;
3167
isCFType(QualType type)3168 static bool isCFType(QualType type) {
3169 // Someday this can use ns_bridged. For now, it has to do this.
3170 return type->isCARCBridgableType();
3171 }
3172
3173 public:
ARCCastChecker(ASTContext & Context,ARCConversionTypeClass source,ARCConversionTypeClass target,bool diagnose)3174 ARCCastChecker(ASTContext &Context, ARCConversionTypeClass source,
3175 ARCConversionTypeClass target, bool diagnose)
3176 : Context(Context), SourceClass(source), TargetClass(target),
3177 Diagnose(diagnose) {}
3178
3179 using super::Visit;
Visit(Expr * e)3180 ACCResult Visit(Expr *e) {
3181 return super::Visit(e->IgnoreParens());
3182 }
3183
VisitStmt(Stmt * s)3184 ACCResult VisitStmt(Stmt *s) {
3185 return ACC_invalid;
3186 }
3187
3188 /// Null pointer constants can be casted however you please.
VisitExpr(Expr * e)3189 ACCResult VisitExpr(Expr *e) {
3190 if (e->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull))
3191 return ACC_bottom;
3192 return ACC_invalid;
3193 }
3194
3195 /// Objective-C string literals can be safely casted.
VisitObjCStringLiteral(ObjCStringLiteral * e)3196 ACCResult VisitObjCStringLiteral(ObjCStringLiteral *e) {
3197 // If we're casting to any retainable type, go ahead. Global
3198 // strings are immune to retains, so this is bottom.
3199 if (isAnyRetainable(TargetClass)) return ACC_bottom;
3200
3201 return ACC_invalid;
3202 }
3203
3204 /// Look through certain implicit and explicit casts.
VisitCastExpr(CastExpr * e)3205 ACCResult VisitCastExpr(CastExpr *e) {
3206 switch (e->getCastKind()) {
3207 case CK_NullToPointer:
3208 return ACC_bottom;
3209
3210 case CK_NoOp:
3211 case CK_LValueToRValue:
3212 case CK_BitCast:
3213 case CK_CPointerToObjCPointerCast:
3214 case CK_BlockPointerToObjCPointerCast:
3215 case CK_AnyPointerToBlockPointerCast:
3216 return Visit(e->getSubExpr());
3217
3218 default:
3219 return ACC_invalid;
3220 }
3221 }
3222
3223 /// Look through unary extension.
VisitUnaryExtension(UnaryOperator * e)3224 ACCResult VisitUnaryExtension(UnaryOperator *e) {
3225 return Visit(e->getSubExpr());
3226 }
3227
3228 /// Ignore the LHS of a comma operator.
VisitBinComma(BinaryOperator * e)3229 ACCResult VisitBinComma(BinaryOperator *e) {
3230 return Visit(e->getRHS());
3231 }
3232
3233 /// Conditional operators are okay if both sides are okay.
VisitConditionalOperator(ConditionalOperator * e)3234 ACCResult VisitConditionalOperator(ConditionalOperator *e) {
3235 ACCResult left = Visit(e->getTrueExpr());
3236 if (left == ACC_invalid) return ACC_invalid;
3237 return merge(left, Visit(e->getFalseExpr()));
3238 }
3239
3240 /// Look through pseudo-objects.
VisitPseudoObjectExpr(PseudoObjectExpr * e)3241 ACCResult VisitPseudoObjectExpr(PseudoObjectExpr *e) {
3242 // If we're getting here, we should always have a result.
3243 return Visit(e->getResultExpr());
3244 }
3245
3246 /// Statement expressions are okay if their result expression is okay.
VisitStmtExpr(StmtExpr * e)3247 ACCResult VisitStmtExpr(StmtExpr *e) {
3248 return Visit(e->getSubStmt()->body_back());
3249 }
3250
3251 /// Some declaration references are okay.
VisitDeclRefExpr(DeclRefExpr * e)3252 ACCResult VisitDeclRefExpr(DeclRefExpr *e) {
3253 VarDecl *var = dyn_cast<VarDecl>(e->getDecl());
3254 // References to global constants are okay.
3255 if (isAnyRetainable(TargetClass) &&
3256 isAnyRetainable(SourceClass) &&
3257 var &&
3258 var->getStorageClass() == SC_Extern &&
3259 var->getType().isConstQualified()) {
3260
3261 // In system headers, they can also be assumed to be immune to retains.
3262 // These are things like 'kCFStringTransformToLatin'.
3263 if (Context.getSourceManager().isInSystemHeader(var->getLocation()))
3264 return ACC_bottom;
3265
3266 return ACC_plusZero;
3267 }
3268
3269 // Nothing else.
3270 return ACC_invalid;
3271 }
3272
3273 /// Some calls are okay.
VisitCallExpr(CallExpr * e)3274 ACCResult VisitCallExpr(CallExpr *e) {
3275 if (FunctionDecl *fn = e->getDirectCallee())
3276 if (ACCResult result = checkCallToFunction(fn))
3277 return result;
3278
3279 return super::VisitCallExpr(e);
3280 }
3281
checkCallToFunction(FunctionDecl * fn)3282 ACCResult checkCallToFunction(FunctionDecl *fn) {
3283 // Require a CF*Ref return type.
3284 if (!isCFType(fn->getReturnType()))
3285 return ACC_invalid;
3286
3287 if (!isAnyRetainable(TargetClass))
3288 return ACC_invalid;
3289
3290 // Honor an explicit 'not retained' attribute.
3291 if (fn->hasAttr<CFReturnsNotRetainedAttr>())
3292 return ACC_plusZero;
3293
3294 // Honor an explicit 'retained' attribute, except that for
3295 // now we're not going to permit implicit handling of +1 results,
3296 // because it's a bit frightening.
3297 if (fn->hasAttr<CFReturnsRetainedAttr>())
3298 return Diagnose ? ACC_plusOne
3299 : ACC_invalid; // ACC_plusOne if we start accepting this
3300
3301 // Recognize this specific builtin function, which is used by CFSTR.
3302 unsigned builtinID = fn->getBuiltinID();
3303 if (builtinID == Builtin::BI__builtin___CFStringMakeConstantString)
3304 return ACC_bottom;
3305
3306 // Otherwise, don't do anything implicit with an unaudited function.
3307 if (!fn->hasAttr<CFAuditedTransferAttr>())
3308 return ACC_invalid;
3309
3310 // Otherwise, it's +0 unless it follows the create convention.
3311 if (ento::coreFoundation::followsCreateRule(fn))
3312 return Diagnose ? ACC_plusOne
3313 : ACC_invalid; // ACC_plusOne if we start accepting this
3314
3315 return ACC_plusZero;
3316 }
3317
VisitObjCMessageExpr(ObjCMessageExpr * e)3318 ACCResult VisitObjCMessageExpr(ObjCMessageExpr *e) {
3319 return checkCallToMethod(e->getMethodDecl());
3320 }
3321
VisitObjCPropertyRefExpr(ObjCPropertyRefExpr * e)3322 ACCResult VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *e) {
3323 ObjCMethodDecl *method;
3324 if (e->isExplicitProperty())
3325 method = e->getExplicitProperty()->getGetterMethodDecl();
3326 else
3327 method = e->getImplicitPropertyGetter();
3328 return checkCallToMethod(method);
3329 }
3330
checkCallToMethod(ObjCMethodDecl * method)3331 ACCResult checkCallToMethod(ObjCMethodDecl *method) {
3332 if (!method) return ACC_invalid;
3333
3334 // Check for message sends to functions returning CF types. We
3335 // just obey the Cocoa conventions with these, even though the
3336 // return type is CF.
3337 if (!isAnyRetainable(TargetClass) || !isCFType(method->getReturnType()))
3338 return ACC_invalid;
3339
3340 // If the method is explicitly marked not-retained, it's +0.
3341 if (method->hasAttr<CFReturnsNotRetainedAttr>())
3342 return ACC_plusZero;
3343
3344 // If the method is explicitly marked as returning retained, or its
3345 // selector follows a +1 Cocoa convention, treat it as +1.
3346 if (method->hasAttr<CFReturnsRetainedAttr>())
3347 return ACC_plusOne;
3348
3349 switch (method->getSelector().getMethodFamily()) {
3350 case OMF_alloc:
3351 case OMF_copy:
3352 case OMF_mutableCopy:
3353 case OMF_new:
3354 return ACC_plusOne;
3355
3356 default:
3357 // Otherwise, treat it as +0.
3358 return ACC_plusZero;
3359 }
3360 }
3361 };
3362 } // end anonymous namespace
3363
isKnownName(StringRef name)3364 bool Sema::isKnownName(StringRef name) {
3365 if (name.empty())
3366 return false;
3367 LookupResult R(*this, &Context.Idents.get(name), SourceLocation(),
3368 Sema::LookupOrdinaryName);
3369 return LookupName(R, TUScope, false);
3370 }
3371
addFixitForObjCARCConversion(Sema & S,DiagnosticBuilder & DiagB,Sema::CheckedConversionKind CCK,SourceLocation afterLParen,QualType castType,Expr * castExpr,Expr * realCast,const char * bridgeKeyword,const char * CFBridgeName)3372 static void addFixitForObjCARCConversion(Sema &S,
3373 DiagnosticBuilder &DiagB,
3374 Sema::CheckedConversionKind CCK,
3375 SourceLocation afterLParen,
3376 QualType castType,
3377 Expr *castExpr,
3378 Expr *realCast,
3379 const char *bridgeKeyword,
3380 const char *CFBridgeName) {
3381 // We handle C-style and implicit casts here.
3382 switch (CCK) {
3383 case Sema::CCK_ImplicitConversion:
3384 case Sema::CCK_CStyleCast:
3385 case Sema::CCK_OtherCast:
3386 break;
3387 case Sema::CCK_FunctionalCast:
3388 return;
3389 }
3390
3391 if (CFBridgeName) {
3392 if (CCK == Sema::CCK_OtherCast) {
3393 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3394 SourceRange range(NCE->getOperatorLoc(),
3395 NCE->getAngleBrackets().getEnd());
3396 SmallString<32> BridgeCall;
3397
3398 SourceManager &SM = S.getSourceManager();
3399 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3400 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3401 BridgeCall += ' ';
3402
3403 BridgeCall += CFBridgeName;
3404 DiagB.AddFixItHint(FixItHint::CreateReplacement(range, BridgeCall));
3405 }
3406 return;
3407 }
3408 Expr *castedE = castExpr;
3409 if (CStyleCastExpr *CCE = dyn_cast<CStyleCastExpr>(castedE))
3410 castedE = CCE->getSubExpr();
3411 castedE = castedE->IgnoreImpCasts();
3412 SourceRange range = castedE->getSourceRange();
3413
3414 SmallString<32> BridgeCall;
3415
3416 SourceManager &SM = S.getSourceManager();
3417 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
3418 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
3419 BridgeCall += ' ';
3420
3421 BridgeCall += CFBridgeName;
3422
3423 if (isa<ParenExpr>(castedE)) {
3424 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3425 BridgeCall));
3426 } else {
3427 BridgeCall += '(';
3428 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3429 BridgeCall));
3430 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3431 S.getLocForEndOfToken(range.getEnd()),
3432 ")"));
3433 }
3434 return;
3435 }
3436
3437 if (CCK == Sema::CCK_CStyleCast) {
3438 DiagB.AddFixItHint(FixItHint::CreateInsertion(afterLParen, bridgeKeyword));
3439 } else if (CCK == Sema::CCK_OtherCast) {
3440 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3441 std::string castCode = "(";
3442 castCode += bridgeKeyword;
3443 castCode += castType.getAsString();
3444 castCode += ")";
3445 SourceRange Range(NCE->getOperatorLoc(),
3446 NCE->getAngleBrackets().getEnd());
3447 DiagB.AddFixItHint(FixItHint::CreateReplacement(Range, castCode));
3448 }
3449 } else {
3450 std::string castCode = "(";
3451 castCode += bridgeKeyword;
3452 castCode += castType.getAsString();
3453 castCode += ")";
3454 Expr *castedE = castExpr->IgnoreImpCasts();
3455 SourceRange range = castedE->getSourceRange();
3456 if (isa<ParenExpr>(castedE)) {
3457 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3458 castCode));
3459 } else {
3460 castCode += "(";
3461 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3462 castCode));
3463 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3464 S.getLocForEndOfToken(range.getEnd()),
3465 ")"));
3466 }
3467 }
3468 }
3469
3470 template <typename T>
getObjCBridgeAttr(const TypedefType * TD)3471 static inline T *getObjCBridgeAttr(const TypedefType *TD) {
3472 TypedefNameDecl *TDNDecl = TD->getDecl();
3473 QualType QT = TDNDecl->getUnderlyingType();
3474 if (QT->isPointerType()) {
3475 QT = QT->getPointeeType();
3476 if (const RecordType *RT = QT->getAs<RecordType>())
3477 if (RecordDecl *RD = RT->getDecl()->getMostRecentDecl())
3478 return RD->getAttr<T>();
3479 }
3480 return nullptr;
3481 }
3482
ObjCBridgeRelatedAttrFromType(QualType T,TypedefNameDecl * & TDNDecl)3483 static ObjCBridgeRelatedAttr *ObjCBridgeRelatedAttrFromType(QualType T,
3484 TypedefNameDecl *&TDNDecl) {
3485 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3486 TDNDecl = TD->getDecl();
3487 if (ObjCBridgeRelatedAttr *ObjCBAttr =
3488 getObjCBridgeAttr<ObjCBridgeRelatedAttr>(TD))
3489 return ObjCBAttr;
3490 T = TDNDecl->getUnderlyingType();
3491 }
3492 return nullptr;
3493 }
3494
3495 static void
diagnoseObjCARCConversion(Sema & S,SourceRange castRange,QualType castType,ARCConversionTypeClass castACTC,Expr * castExpr,Expr * realCast,ARCConversionTypeClass exprACTC,Sema::CheckedConversionKind CCK)3496 diagnoseObjCARCConversion(Sema &S, SourceRange castRange,
3497 QualType castType, ARCConversionTypeClass castACTC,
3498 Expr *castExpr, Expr *realCast,
3499 ARCConversionTypeClass exprACTC,
3500 Sema::CheckedConversionKind CCK) {
3501 SourceLocation loc =
3502 (castRange.isValid() ? castRange.getBegin() : castExpr->getExprLoc());
3503
3504 if (S.makeUnavailableInSystemHeader(loc,
3505 UnavailableAttr::IR_ARCForbiddenConversion))
3506 return;
3507
3508 QualType castExprType = castExpr->getType();
3509 // Defer emitting a diagnostic for bridge-related casts; that will be
3510 // handled by CheckObjCBridgeRelatedConversions.
3511 TypedefNameDecl *TDNDecl = nullptr;
3512 if ((castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable &&
3513 ObjCBridgeRelatedAttrFromType(castType, TDNDecl)) ||
3514 (exprACTC == ACTC_coreFoundation && castACTC == ACTC_retainable &&
3515 ObjCBridgeRelatedAttrFromType(castExprType, TDNDecl)))
3516 return;
3517
3518 unsigned srcKind = 0;
3519 switch (exprACTC) {
3520 case ACTC_none:
3521 case ACTC_coreFoundation:
3522 case ACTC_voidPtr:
3523 srcKind = (castExprType->isPointerType() ? 1 : 0);
3524 break;
3525 case ACTC_retainable:
3526 srcKind = (castExprType->isBlockPointerType() ? 2 : 3);
3527 break;
3528 case ACTC_indirectRetainable:
3529 srcKind = 4;
3530 break;
3531 }
3532
3533 // Check whether this could be fixed with a bridge cast.
3534 SourceLocation afterLParen = S.getLocForEndOfToken(castRange.getBegin());
3535 SourceLocation noteLoc = afterLParen.isValid() ? afterLParen : loc;
3536
3537 // Bridge from an ARC type to a CF type.
3538 if (castACTC == ACTC_retainable && isAnyRetainable(exprACTC)) {
3539
3540 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3541 << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit
3542 << 2 // of C pointer type
3543 << castExprType
3544 << unsigned(castType->isBlockPointerType()) // to ObjC|block type
3545 << castType
3546 << castRange
3547 << castExpr->getSourceRange();
3548 bool br = S.isKnownName("CFBridgingRelease");
3549 ACCResult CreateRule =
3550 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3551 assert(CreateRule != ACC_bottom && "This cast should already be accepted.");
3552 if (CreateRule != ACC_plusOne)
3553 {
3554 DiagnosticBuilder DiagB =
3555 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3556 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3557
3558 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3559 castType, castExpr, realCast, "__bridge ",
3560 nullptr);
3561 }
3562 if (CreateRule != ACC_plusZero)
3563 {
3564 DiagnosticBuilder DiagB =
3565 (CCK == Sema::CCK_OtherCast && !br) ?
3566 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_transfer) << castExprType :
3567 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3568 diag::note_arc_bridge_transfer)
3569 << castExprType << br;
3570
3571 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3572 castType, castExpr, realCast, "__bridge_transfer ",
3573 br ? "CFBridgingRelease" : nullptr);
3574 }
3575
3576 return;
3577 }
3578
3579 // Bridge from a CF type to an ARC type.
3580 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC)) {
3581 bool br = S.isKnownName("CFBridgingRetain");
3582 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3583 << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit
3584 << unsigned(castExprType->isBlockPointerType()) // of ObjC|block type
3585 << castExprType
3586 << 2 // to C pointer type
3587 << castType
3588 << castRange
3589 << castExpr->getSourceRange();
3590 ACCResult CreateRule =
3591 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3592 assert(CreateRule != ACC_bottom && "This cast should already be accepted.");
3593 if (CreateRule != ACC_plusOne)
3594 {
3595 DiagnosticBuilder DiagB =
3596 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3597 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3598 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3599 castType, castExpr, realCast, "__bridge ",
3600 nullptr);
3601 }
3602 if (CreateRule != ACC_plusZero)
3603 {
3604 DiagnosticBuilder DiagB =
3605 (CCK == Sema::CCK_OtherCast && !br) ?
3606 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_retained) << castType :
3607 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3608 diag::note_arc_bridge_retained)
3609 << castType << br;
3610
3611 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3612 castType, castExpr, realCast, "__bridge_retained ",
3613 br ? "CFBridgingRetain" : nullptr);
3614 }
3615
3616 return;
3617 }
3618
3619 S.Diag(loc, diag::err_arc_mismatched_cast)
3620 << (CCK != Sema::CCK_ImplicitConversion)
3621 << srcKind << castExprType << castType
3622 << castRange << castExpr->getSourceRange();
3623 }
3624
3625 template <typename TB>
CheckObjCBridgeNSCast(Sema & S,QualType castType,Expr * castExpr,bool & HadTheAttribute,bool warn)3626 static bool CheckObjCBridgeNSCast(Sema &S, QualType castType, Expr *castExpr,
3627 bool &HadTheAttribute, bool warn) {
3628 QualType T = castExpr->getType();
3629 HadTheAttribute = false;
3630 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3631 TypedefNameDecl *TDNDecl = TD->getDecl();
3632 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3633 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3634 HadTheAttribute = true;
3635 if (Parm->isStr("id"))
3636 return true;
3637
3638 NamedDecl *Target = nullptr;
3639 // Check for an existing type with this name.
3640 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3641 Sema::LookupOrdinaryName);
3642 if (S.LookupName(R, S.TUScope)) {
3643 Target = R.getFoundDecl();
3644 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3645 ObjCInterfaceDecl *ExprClass = cast<ObjCInterfaceDecl>(Target);
3646 if (const ObjCObjectPointerType *InterfacePointerType =
3647 castType->getAsObjCInterfacePointerType()) {
3648 ObjCInterfaceDecl *CastClass
3649 = InterfacePointerType->getObjectType()->getInterface();
3650 if ((CastClass == ExprClass) ||
3651 (CastClass && CastClass->isSuperClassOf(ExprClass)))
3652 return true;
3653 if (warn)
3654 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge)
3655 << T << Target->getName() << castType->getPointeeType();
3656 return false;
3657 } else if (castType->isObjCIdType() ||
3658 (S.Context.ObjCObjectAdoptsQTypeProtocols(
3659 castType, ExprClass)))
3660 // ok to cast to 'id'.
3661 // casting to id<p-list> is ok if bridge type adopts all of
3662 // p-list protocols.
3663 return true;
3664 else {
3665 if (warn) {
3666 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge)
3667 << T << Target->getName() << castType;
3668 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3669 S.Diag(Target->getLocStart(), diag::note_declared_at);
3670 }
3671 return false;
3672 }
3673 }
3674 } else if (!castType->isObjCIdType()) {
3675 S.Diag(castExpr->getLocStart(), diag::err_objc_cf_bridged_not_interface)
3676 << castExpr->getType() << Parm;
3677 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3678 if (Target)
3679 S.Diag(Target->getLocStart(), diag::note_declared_at);
3680 }
3681 return true;
3682 }
3683 return false;
3684 }
3685 T = TDNDecl->getUnderlyingType();
3686 }
3687 return true;
3688 }
3689
3690 template <typename TB>
CheckObjCBridgeCFCast(Sema & S,QualType castType,Expr * castExpr,bool & HadTheAttribute,bool warn)3691 static bool CheckObjCBridgeCFCast(Sema &S, QualType castType, Expr *castExpr,
3692 bool &HadTheAttribute, bool warn) {
3693 QualType T = castType;
3694 HadTheAttribute = false;
3695 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3696 TypedefNameDecl *TDNDecl = TD->getDecl();
3697 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) {
3698 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3699 HadTheAttribute = true;
3700 if (Parm->isStr("id"))
3701 return true;
3702
3703 NamedDecl *Target = nullptr;
3704 // Check for an existing type with this name.
3705 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3706 Sema::LookupOrdinaryName);
3707 if (S.LookupName(R, S.TUScope)) {
3708 Target = R.getFoundDecl();
3709 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3710 ObjCInterfaceDecl *CastClass = cast<ObjCInterfaceDecl>(Target);
3711 if (const ObjCObjectPointerType *InterfacePointerType =
3712 castExpr->getType()->getAsObjCInterfacePointerType()) {
3713 ObjCInterfaceDecl *ExprClass
3714 = InterfacePointerType->getObjectType()->getInterface();
3715 if ((CastClass == ExprClass) ||
3716 (ExprClass && CastClass->isSuperClassOf(ExprClass)))
3717 return true;
3718 if (warn) {
3719 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge_to_cf)
3720 << castExpr->getType()->getPointeeType() << T;
3721 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3722 }
3723 return false;
3724 } else if (castExpr->getType()->isObjCIdType() ||
3725 (S.Context.QIdProtocolsAdoptObjCObjectProtocols(
3726 castExpr->getType(), CastClass)))
3727 // ok to cast an 'id' expression to a CFtype.
3728 // ok to cast an 'id<plist>' expression to CFtype provided plist
3729 // adopts all of CFtype's ObjetiveC's class plist.
3730 return true;
3731 else {
3732 if (warn) {
3733 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge_to_cf)
3734 << castExpr->getType() << castType;
3735 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3736 S.Diag(Target->getLocStart(), diag::note_declared_at);
3737 }
3738 return false;
3739 }
3740 }
3741 }
3742 S.Diag(castExpr->getLocStart(), diag::err_objc_ns_bridged_invalid_cfobject)
3743 << castExpr->getType() << castType;
3744 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3745 if (Target)
3746 S.Diag(Target->getLocStart(), diag::note_declared_at);
3747 return true;
3748 }
3749 return false;
3750 }
3751 T = TDNDecl->getUnderlyingType();
3752 }
3753 return true;
3754 }
3755
CheckTollFreeBridgeCast(QualType castType,Expr * castExpr)3756 void Sema::CheckTollFreeBridgeCast(QualType castType, Expr *castExpr) {
3757 if (!getLangOpts().ObjC1)
3758 return;
3759 // warn in presence of __bridge casting to or from a toll free bridge cast.
3760 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExpr->getType());
3761 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
3762 if (castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) {
3763 bool HasObjCBridgeAttr;
3764 bool ObjCBridgeAttrWillNotWarn =
3765 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3766 false);
3767 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3768 return;
3769 bool HasObjCBridgeMutableAttr;
3770 bool ObjCBridgeMutableAttrWillNotWarn =
3771 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3772 HasObjCBridgeMutableAttr, false);
3773 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3774 return;
3775
3776 if (HasObjCBridgeAttr)
3777 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3778 true);
3779 else if (HasObjCBridgeMutableAttr)
3780 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3781 HasObjCBridgeMutableAttr, true);
3782 }
3783 else if (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable) {
3784 bool HasObjCBridgeAttr;
3785 bool ObjCBridgeAttrWillNotWarn =
3786 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3787 false);
3788 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr)
3789 return;
3790 bool HasObjCBridgeMutableAttr;
3791 bool ObjCBridgeMutableAttrWillNotWarn =
3792 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3793 HasObjCBridgeMutableAttr, false);
3794 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr)
3795 return;
3796
3797 if (HasObjCBridgeAttr)
3798 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr,
3799 true);
3800 else if (HasObjCBridgeMutableAttr)
3801 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr,
3802 HasObjCBridgeMutableAttr, true);
3803 }
3804 }
3805
CheckObjCBridgeRelatedCast(QualType castType,Expr * castExpr)3806 void Sema::CheckObjCBridgeRelatedCast(QualType castType, Expr *castExpr) {
3807 QualType SrcType = castExpr->getType();
3808 if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(castExpr)) {
3809 if (PRE->isExplicitProperty()) {
3810 if (ObjCPropertyDecl *PDecl = PRE->getExplicitProperty())
3811 SrcType = PDecl->getType();
3812 }
3813 else if (PRE->isImplicitProperty()) {
3814 if (ObjCMethodDecl *Getter = PRE->getImplicitPropertyGetter())
3815 SrcType = Getter->getReturnType();
3816 }
3817 }
3818
3819 ARCConversionTypeClass srcExprACTC = classifyTypeForARCConversion(SrcType);
3820 ARCConversionTypeClass castExprACTC = classifyTypeForARCConversion(castType);
3821 if (srcExprACTC != ACTC_retainable || castExprACTC != ACTC_coreFoundation)
3822 return;
3823 CheckObjCBridgeRelatedConversions(castExpr->getLocStart(),
3824 castType, SrcType, castExpr);
3825 }
3826
CheckTollFreeBridgeStaticCast(QualType castType,Expr * castExpr,CastKind & Kind)3827 bool Sema::CheckTollFreeBridgeStaticCast(QualType castType, Expr *castExpr,
3828 CastKind &Kind) {
3829 if (!getLangOpts().ObjC1)
3830 return false;
3831 ARCConversionTypeClass exprACTC =
3832 classifyTypeForARCConversion(castExpr->getType());
3833 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType);
3834 if ((castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) ||
3835 (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable)) {
3836 CheckTollFreeBridgeCast(castType, castExpr);
3837 Kind = (castACTC == ACTC_coreFoundation) ? CK_BitCast
3838 : CK_CPointerToObjCPointerCast;
3839 return true;
3840 }
3841 return false;
3842 }
3843
checkObjCBridgeRelatedComponents(SourceLocation Loc,QualType DestType,QualType SrcType,ObjCInterfaceDecl * & RelatedClass,ObjCMethodDecl * & ClassMethod,ObjCMethodDecl * & InstanceMethod,TypedefNameDecl * & TDNDecl,bool CfToNs,bool Diagnose)3844 bool Sema::checkObjCBridgeRelatedComponents(SourceLocation Loc,
3845 QualType DestType, QualType SrcType,
3846 ObjCInterfaceDecl *&RelatedClass,
3847 ObjCMethodDecl *&ClassMethod,
3848 ObjCMethodDecl *&InstanceMethod,
3849 TypedefNameDecl *&TDNDecl,
3850 bool CfToNs, bool Diagnose) {
3851 QualType T = CfToNs ? SrcType : DestType;
3852 ObjCBridgeRelatedAttr *ObjCBAttr = ObjCBridgeRelatedAttrFromType(T, TDNDecl);
3853 if (!ObjCBAttr)
3854 return false;
3855
3856 IdentifierInfo *RCId = ObjCBAttr->getRelatedClass();
3857 IdentifierInfo *CMId = ObjCBAttr->getClassMethod();
3858 IdentifierInfo *IMId = ObjCBAttr->getInstanceMethod();
3859 if (!RCId)
3860 return false;
3861 NamedDecl *Target = nullptr;
3862 // Check for an existing type with this name.
3863 LookupResult R(*this, DeclarationName(RCId), SourceLocation(),
3864 Sema::LookupOrdinaryName);
3865 if (!LookupName(R, TUScope)) {
3866 if (Diagnose) {
3867 Diag(Loc, diag::err_objc_bridged_related_invalid_class) << RCId
3868 << SrcType << DestType;
3869 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3870 }
3871 return false;
3872 }
3873 Target = R.getFoundDecl();
3874 if (Target && isa<ObjCInterfaceDecl>(Target))
3875 RelatedClass = cast<ObjCInterfaceDecl>(Target);
3876 else {
3877 if (Diagnose) {
3878 Diag(Loc, diag::err_objc_bridged_related_invalid_class_name) << RCId
3879 << SrcType << DestType;
3880 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3881 if (Target)
3882 Diag(Target->getLocStart(), diag::note_declared_at);
3883 }
3884 return false;
3885 }
3886
3887 // Check for an existing class method with the given selector name.
3888 if (CfToNs && CMId) {
3889 Selector Sel = Context.Selectors.getUnarySelector(CMId);
3890 ClassMethod = RelatedClass->lookupMethod(Sel, false);
3891 if (!ClassMethod) {
3892 if (Diagnose) {
3893 Diag(Loc, diag::err_objc_bridged_related_known_method)
3894 << SrcType << DestType << Sel << false;
3895 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3896 }
3897 return false;
3898 }
3899 }
3900
3901 // Check for an existing instance method with the given selector name.
3902 if (!CfToNs && IMId) {
3903 Selector Sel = Context.Selectors.getNullarySelector(IMId);
3904 InstanceMethod = RelatedClass->lookupMethod(Sel, true);
3905 if (!InstanceMethod) {
3906 if (Diagnose) {
3907 Diag(Loc, diag::err_objc_bridged_related_known_method)
3908 << SrcType << DestType << Sel << true;
3909 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3910 }
3911 return false;
3912 }
3913 }
3914 return true;
3915 }
3916
3917 bool
CheckObjCBridgeRelatedConversions(SourceLocation Loc,QualType DestType,QualType SrcType,Expr * & SrcExpr,bool Diagnose)3918 Sema::CheckObjCBridgeRelatedConversions(SourceLocation Loc,
3919 QualType DestType, QualType SrcType,
3920 Expr *&SrcExpr, bool Diagnose) {
3921 ARCConversionTypeClass rhsExprACTC = classifyTypeForARCConversion(SrcType);
3922 ARCConversionTypeClass lhsExprACTC = classifyTypeForARCConversion(DestType);
3923 bool CfToNs = (rhsExprACTC == ACTC_coreFoundation && lhsExprACTC == ACTC_retainable);
3924 bool NsToCf = (rhsExprACTC == ACTC_retainable && lhsExprACTC == ACTC_coreFoundation);
3925 if (!CfToNs && !NsToCf)
3926 return false;
3927
3928 ObjCInterfaceDecl *RelatedClass;
3929 ObjCMethodDecl *ClassMethod = nullptr;
3930 ObjCMethodDecl *InstanceMethod = nullptr;
3931 TypedefNameDecl *TDNDecl = nullptr;
3932 if (!checkObjCBridgeRelatedComponents(Loc, DestType, SrcType, RelatedClass,
3933 ClassMethod, InstanceMethod, TDNDecl,
3934 CfToNs, Diagnose))
3935 return false;
3936
3937 if (CfToNs) {
3938 // Implicit conversion from CF to ObjC object is needed.
3939 if (ClassMethod) {
3940 if (Diagnose) {
3941 std::string ExpressionString = "[";
3942 ExpressionString += RelatedClass->getNameAsString();
3943 ExpressionString += " ";
3944 ExpressionString += ClassMethod->getSelector().getAsString();
3945 SourceLocation SrcExprEndLoc = getLocForEndOfToken(SrcExpr->getLocEnd());
3946 // Provide a fixit: [RelatedClass ClassMethod SrcExpr]
3947 Diag(Loc, diag::err_objc_bridged_related_known_method)
3948 << SrcType << DestType << ClassMethod->getSelector() << false
3949 << FixItHint::CreateInsertion(SrcExpr->getLocStart(), ExpressionString)
3950 << FixItHint::CreateInsertion(SrcExprEndLoc, "]");
3951 Diag(RelatedClass->getLocStart(), diag::note_declared_at);
3952 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3953
3954 QualType receiverType = Context.getObjCInterfaceType(RelatedClass);
3955 // Argument.
3956 Expr *args[] = { SrcExpr };
3957 ExprResult msg = BuildClassMessageImplicit(receiverType, false,
3958 ClassMethod->getLocation(),
3959 ClassMethod->getSelector(), ClassMethod,
3960 MultiExprArg(args, 1));
3961 SrcExpr = msg.get();
3962 }
3963 return true;
3964 }
3965 }
3966 else {
3967 // Implicit conversion from ObjC type to CF object is needed.
3968 if (InstanceMethod) {
3969 if (Diagnose) {
3970 std::string ExpressionString;
3971 SourceLocation SrcExprEndLoc =
3972 getLocForEndOfToken(SrcExpr->getLocEnd());
3973 if (InstanceMethod->isPropertyAccessor())
3974 if (const ObjCPropertyDecl *PDecl =
3975 InstanceMethod->findPropertyDecl()) {
3976 // fixit: ObjectExpr.propertyname when it is aproperty accessor.
3977 ExpressionString = ".";
3978 ExpressionString += PDecl->getNameAsString();
3979 Diag(Loc, diag::err_objc_bridged_related_known_method)
3980 << SrcType << DestType << InstanceMethod->getSelector() << true
3981 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
3982 }
3983 if (ExpressionString.empty()) {
3984 // Provide a fixit: [ObjectExpr InstanceMethod]
3985 ExpressionString = " ";
3986 ExpressionString += InstanceMethod->getSelector().getAsString();
3987 ExpressionString += "]";
3988
3989 Diag(Loc, diag::err_objc_bridged_related_known_method)
3990 << SrcType << DestType << InstanceMethod->getSelector() << true
3991 << FixItHint::CreateInsertion(SrcExpr->getLocStart(), "[")
3992 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString);
3993 }
3994 Diag(RelatedClass->getLocStart(), diag::note_declared_at);
3995 Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3996
3997 ExprResult msg =
3998 BuildInstanceMessageImplicit(SrcExpr, SrcType,
3999 InstanceMethod->getLocation(),
4000 InstanceMethod->getSelector(),
4001 InstanceMethod, None);
4002 SrcExpr = msg.get();
4003 }
4004 return true;
4005 }
4006 }
4007 return false;
4008 }
4009
4010 Sema::ARCConversionResult
CheckObjCARCConversion(SourceRange castRange,QualType castType,Expr * & castExpr,CheckedConversionKind CCK,bool Diagnose,bool DiagnoseCFAudited,BinaryOperatorKind Opc)4011 Sema::CheckObjCARCConversion(SourceRange castRange, QualType castType,
4012 Expr *&castExpr, CheckedConversionKind CCK,
4013 bool Diagnose,
4014 bool DiagnoseCFAudited,
4015 BinaryOperatorKind Opc) {
4016 QualType castExprType = castExpr->getType();
4017
4018 // For the purposes of the classification, we assume reference types
4019 // will bind to temporaries.
4020 QualType effCastType = castType;
4021 if (const ReferenceType *ref = castType->getAs<ReferenceType>())
4022 effCastType = ref->getPointeeType();
4023
4024 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExprType);
4025 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(effCastType);
4026 if (exprACTC == castACTC) {
4027 // Check for viability and report error if casting an rvalue to a
4028 // life-time qualifier.
4029 if (castACTC == ACTC_retainable &&
4030 (CCK == CCK_CStyleCast || CCK == CCK_OtherCast) &&
4031 castType != castExprType) {
4032 const Type *DT = castType.getTypePtr();
4033 QualType QDT = castType;
4034 // We desugar some types but not others. We ignore those
4035 // that cannot happen in a cast; i.e. auto, and those which
4036 // should not be de-sugared; i.e typedef.
4037 if (const ParenType *PT = dyn_cast<ParenType>(DT))
4038 QDT = PT->desugar();
4039 else if (const TypeOfType *TP = dyn_cast<TypeOfType>(DT))
4040 QDT = TP->desugar();
4041 else if (const AttributedType *AT = dyn_cast<AttributedType>(DT))
4042 QDT = AT->desugar();
4043 if (QDT != castType &&
4044 QDT.getObjCLifetime() != Qualifiers::OCL_None) {
4045 if (Diagnose) {
4046 SourceLocation loc = (castRange.isValid() ? castRange.getBegin()
4047 : castExpr->getExprLoc());
4048 Diag(loc, diag::err_arc_nolifetime_behavior);
4049 }
4050 return ACR_error;
4051 }
4052 }
4053 return ACR_okay;
4054 }
4055
4056 if (isAnyCLike(exprACTC) && isAnyCLike(castACTC)) return ACR_okay;
4057
4058 // Allow all of these types to be cast to integer types (but not
4059 // vice-versa).
4060 if (castACTC == ACTC_none && castType->isIntegralType(Context))
4061 return ACR_okay;
4062
4063 // Allow casts between pointers to lifetime types (e.g., __strong id*)
4064 // and pointers to void (e.g., cv void *). Casting from void* to lifetime*
4065 // must be explicit.
4066 if (exprACTC == ACTC_indirectRetainable && castACTC == ACTC_voidPtr)
4067 return ACR_okay;
4068 if (castACTC == ACTC_indirectRetainable && exprACTC == ACTC_voidPtr &&
4069 CCK != CCK_ImplicitConversion)
4070 return ACR_okay;
4071
4072 switch (ARCCastChecker(Context, exprACTC, castACTC, false).Visit(castExpr)) {
4073 // For invalid casts, fall through.
4074 case ACC_invalid:
4075 break;
4076
4077 // Do nothing for both bottom and +0.
4078 case ACC_bottom:
4079 case ACC_plusZero:
4080 return ACR_okay;
4081
4082 // If the result is +1, consume it here.
4083 case ACC_plusOne:
4084 castExpr = ImplicitCastExpr::Create(Context, castExpr->getType(),
4085 CK_ARCConsumeObject, castExpr,
4086 nullptr, VK_RValue);
4087 Cleanup.setExprNeedsCleanups(true);
4088 return ACR_okay;
4089 }
4090
4091 // If this is a non-implicit cast from id or block type to a
4092 // CoreFoundation type, delay complaining in case the cast is used
4093 // in an acceptable context.
4094 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC) &&
4095 CCK != CCK_ImplicitConversion)
4096 return ACR_unbridged;
4097
4098 // Issue a diagnostic about a missing @-sign when implicit casting a cstring
4099 // to 'NSString *', instead of falling through to report a "bridge cast"
4100 // diagnostic.
4101 if (castACTC == ACTC_retainable && exprACTC == ACTC_none &&
4102 ConversionToObjCStringLiteralCheck(castType, castExpr, Diagnose))
4103 return ACR_error;
4104
4105 // Do not issue "bridge cast" diagnostic when implicit casting
4106 // a retainable object to a CF type parameter belonging to an audited
4107 // CF API function. Let caller issue a normal type mismatched diagnostic
4108 // instead.
4109 if ((!DiagnoseCFAudited || exprACTC != ACTC_retainable ||
4110 castACTC != ACTC_coreFoundation) &&
4111 !(exprACTC == ACTC_voidPtr && castACTC == ACTC_retainable &&
4112 (Opc == BO_NE || Opc == BO_EQ))) {
4113 if (Diagnose)
4114 diagnoseObjCARCConversion(*this, castRange, castType, castACTC, castExpr,
4115 castExpr, exprACTC, CCK);
4116 return ACR_error;
4117 }
4118 return ACR_okay;
4119 }
4120
4121 /// Given that we saw an expression with the ARCUnbridgedCastTy
4122 /// placeholder type, complain bitterly.
diagnoseARCUnbridgedCast(Expr * e)4123 void Sema::diagnoseARCUnbridgedCast(Expr *e) {
4124 // We expect the spurious ImplicitCastExpr to already have been stripped.
4125 assert(!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast));
4126 CastExpr *realCast = cast<CastExpr>(e->IgnoreParens());
4127
4128 SourceRange castRange;
4129 QualType castType;
4130 CheckedConversionKind CCK;
4131
4132 if (CStyleCastExpr *cast = dyn_cast<CStyleCastExpr>(realCast)) {
4133 castRange = SourceRange(cast->getLParenLoc(), cast->getRParenLoc());
4134 castType = cast->getTypeAsWritten();
4135 CCK = CCK_CStyleCast;
4136 } else if (ExplicitCastExpr *cast = dyn_cast<ExplicitCastExpr>(realCast)) {
4137 castRange = cast->getTypeInfoAsWritten()->getTypeLoc().getSourceRange();
4138 castType = cast->getTypeAsWritten();
4139 CCK = CCK_OtherCast;
4140 } else {
4141 castType = cast->getType();
4142 CCK = CCK_ImplicitConversion;
4143 }
4144
4145 ARCConversionTypeClass castACTC =
4146 classifyTypeForARCConversion(castType.getNonReferenceType());
4147
4148 Expr *castExpr = realCast->getSubExpr();
4149 assert(classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable);
4150
4151 diagnoseObjCARCConversion(*this, castRange, castType, castACTC,
4152 castExpr, realCast, ACTC_retainable, CCK);
4153 }
4154
4155 /// stripARCUnbridgedCast - Given an expression of ARCUnbridgedCast
4156 /// type, remove the placeholder cast.
stripARCUnbridgedCast(Expr * e)4157 Expr *Sema::stripARCUnbridgedCast(Expr *e) {
4158 assert(e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast));
4159
4160 if (ParenExpr *pe = dyn_cast<ParenExpr>(e)) {
4161 Expr *sub = stripARCUnbridgedCast(pe->getSubExpr());
4162 return new (Context) ParenExpr(pe->getLParen(), pe->getRParen(), sub);
4163 } else if (UnaryOperator *uo = dyn_cast<UnaryOperator>(e)) {
4164 assert(uo->getOpcode() == UO_Extension);
4165 Expr *sub = stripARCUnbridgedCast(uo->getSubExpr());
4166 return new (Context) UnaryOperator(sub, UO_Extension, sub->getType(),
4167 sub->getValueKind(), sub->getObjectKind(),
4168 uo->getOperatorLoc());
4169 } else if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) {
4170 assert(!gse->isResultDependent());
4171
4172 unsigned n = gse->getNumAssocs();
4173 SmallVector<Expr*, 4> subExprs(n);
4174 SmallVector<TypeSourceInfo*, 4> subTypes(n);
4175 for (unsigned i = 0; i != n; ++i) {
4176 subTypes[i] = gse->getAssocTypeSourceInfo(i);
4177 Expr *sub = gse->getAssocExpr(i);
4178 if (i == gse->getResultIndex())
4179 sub = stripARCUnbridgedCast(sub);
4180 subExprs[i] = sub;
4181 }
4182
4183 return new (Context) GenericSelectionExpr(Context, gse->getGenericLoc(),
4184 gse->getControllingExpr(),
4185 subTypes, subExprs,
4186 gse->getDefaultLoc(),
4187 gse->getRParenLoc(),
4188 gse->containsUnexpandedParameterPack(),
4189 gse->getResultIndex());
4190 } else {
4191 assert(isa<ImplicitCastExpr>(e) && "bad form of unbridged cast!");
4192 return cast<ImplicitCastExpr>(e)->getSubExpr();
4193 }
4194 }
4195
CheckObjCARCUnavailableWeakConversion(QualType castType,QualType exprType)4196 bool Sema::CheckObjCARCUnavailableWeakConversion(QualType castType,
4197 QualType exprType) {
4198 QualType canCastType =
4199 Context.getCanonicalType(castType).getUnqualifiedType();
4200 QualType canExprType =
4201 Context.getCanonicalType(exprType).getUnqualifiedType();
4202 if (isa<ObjCObjectPointerType>(canCastType) &&
4203 castType.getObjCLifetime() == Qualifiers::OCL_Weak &&
4204 canExprType->isObjCObjectPointerType()) {
4205 if (const ObjCObjectPointerType *ObjT =
4206 canExprType->getAs<ObjCObjectPointerType>())
4207 if (const ObjCInterfaceDecl *ObjI = ObjT->getInterfaceDecl())
4208 return !ObjI->isArcWeakrefUnavailable();
4209 }
4210 return true;
4211 }
4212
4213 /// Look for an ObjCReclaimReturnedObject cast and destroy it.
maybeUndoReclaimObject(Expr * e)4214 static Expr *maybeUndoReclaimObject(Expr *e) {
4215 // For now, we just undo operands that are *immediately* reclaim
4216 // expressions, which prevents the vast majority of potential
4217 // problems here. To catch them all, we'd need to rebuild arbitrary
4218 // value-propagating subexpressions --- we can't reliably rebuild
4219 // in-place because of expression sharing.
4220 if (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e))
4221 if (ice->getCastKind() == CK_ARCReclaimReturnedObject)
4222 return ice->getSubExpr();
4223
4224 return e;
4225 }
4226
BuildObjCBridgedCast(SourceLocation LParenLoc,ObjCBridgeCastKind Kind,SourceLocation BridgeKeywordLoc,TypeSourceInfo * TSInfo,Expr * SubExpr)4227 ExprResult Sema::BuildObjCBridgedCast(SourceLocation LParenLoc,
4228 ObjCBridgeCastKind Kind,
4229 SourceLocation BridgeKeywordLoc,
4230 TypeSourceInfo *TSInfo,
4231 Expr *SubExpr) {
4232 ExprResult SubResult = UsualUnaryConversions(SubExpr);
4233 if (SubResult.isInvalid()) return ExprError();
4234 SubExpr = SubResult.get();
4235
4236 QualType T = TSInfo->getType();
4237 QualType FromType = SubExpr->getType();
4238
4239 CastKind CK;
4240
4241 bool MustConsume = false;
4242 if (T->isDependentType() || SubExpr->isTypeDependent()) {
4243 // Okay: we'll build a dependent expression type.
4244 CK = CK_Dependent;
4245 } else if (T->isObjCARCBridgableType() && FromType->isCARCBridgableType()) {
4246 // Casting CF -> id
4247 CK = (T->isBlockPointerType() ? CK_AnyPointerToBlockPointerCast
4248 : CK_CPointerToObjCPointerCast);
4249 switch (Kind) {
4250 case OBC_Bridge:
4251 break;
4252
4253 case OBC_BridgeRetained: {
4254 bool br = isKnownName("CFBridgingRelease");
4255 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4256 << 2
4257 << FromType
4258 << (T->isBlockPointerType()? 1 : 0)
4259 << T
4260 << SubExpr->getSourceRange()
4261 << Kind;
4262 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4263 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge");
4264 Diag(BridgeKeywordLoc, diag::note_arc_bridge_transfer)
4265 << FromType << br
4266 << FixItHint::CreateReplacement(BridgeKeywordLoc,
4267 br ? "CFBridgingRelease "
4268 : "__bridge_transfer ");
4269
4270 Kind = OBC_Bridge;
4271 break;
4272 }
4273
4274 case OBC_BridgeTransfer:
4275 // We must consume the Objective-C object produced by the cast.
4276 MustConsume = true;
4277 break;
4278 }
4279 } else if (T->isCARCBridgableType() && FromType->isObjCARCBridgableType()) {
4280 // Okay: id -> CF
4281 CK = CK_BitCast;
4282 switch (Kind) {
4283 case OBC_Bridge:
4284 // Reclaiming a value that's going to be __bridge-casted to CF
4285 // is very dangerous, so we don't do it.
4286 SubExpr = maybeUndoReclaimObject(SubExpr);
4287 break;
4288
4289 case OBC_BridgeRetained:
4290 // Produce the object before casting it.
4291 SubExpr = ImplicitCastExpr::Create(Context, FromType,
4292 CK_ARCProduceObject,
4293 SubExpr, nullptr, VK_RValue);
4294 break;
4295
4296 case OBC_BridgeTransfer: {
4297 bool br = isKnownName("CFBridgingRetain");
4298 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
4299 << (FromType->isBlockPointerType()? 1 : 0)
4300 << FromType
4301 << 2
4302 << T
4303 << SubExpr->getSourceRange()
4304 << Kind;
4305
4306 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
4307 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge ");
4308 Diag(BridgeKeywordLoc, diag::note_arc_bridge_retained)
4309 << T << br
4310 << FixItHint::CreateReplacement(BridgeKeywordLoc,
4311 br ? "CFBridgingRetain " : "__bridge_retained");
4312
4313 Kind = OBC_Bridge;
4314 break;
4315 }
4316 }
4317 } else {
4318 Diag(LParenLoc, diag::err_arc_bridge_cast_incompatible)
4319 << FromType << T << Kind
4320 << SubExpr->getSourceRange()
4321 << TSInfo->getTypeLoc().getSourceRange();
4322 return ExprError();
4323 }
4324
4325 Expr *Result = new (Context) ObjCBridgedCastExpr(LParenLoc, Kind, CK,
4326 BridgeKeywordLoc,
4327 TSInfo, SubExpr);
4328
4329 if (MustConsume) {
4330 Cleanup.setExprNeedsCleanups(true);
4331 Result = ImplicitCastExpr::Create(Context, T, CK_ARCConsumeObject, Result,
4332 nullptr, VK_RValue);
4333 }
4334
4335 return Result;
4336 }
4337
ActOnObjCBridgedCast(Scope * S,SourceLocation LParenLoc,ObjCBridgeCastKind Kind,SourceLocation BridgeKeywordLoc,ParsedType Type,SourceLocation RParenLoc,Expr * SubExpr)4338 ExprResult Sema::ActOnObjCBridgedCast(Scope *S,
4339 SourceLocation LParenLoc,
4340 ObjCBridgeCastKind Kind,
4341 SourceLocation BridgeKeywordLoc,
4342 ParsedType Type,
4343 SourceLocation RParenLoc,
4344 Expr *SubExpr) {
4345 TypeSourceInfo *TSInfo = nullptr;
4346 QualType T = GetTypeFromParser(Type, &TSInfo);
4347 if (Kind == OBC_Bridge)
4348 CheckTollFreeBridgeCast(T, SubExpr);
4349 if (!TSInfo)
4350 TSInfo = Context.getTrivialTypeSourceInfo(T, LParenLoc);
4351 return BuildObjCBridgedCast(LParenLoc, Kind, BridgeKeywordLoc, TSInfo,
4352 SubExpr);
4353 }
4354