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,Expr ** strings,unsigned NumStrings)34 ExprResult Sema::ParseObjCStringLiteral(SourceLocation *AtLocs,
35 Expr **strings,
36 unsigned NumStrings) {
37 StringLiteral **Strings = reinterpret_cast<StringLiteral**>(strings);
38
39 // Most ObjC strings are formed out of a single piece. However, we *can*
40 // have strings formed out of multiple @ strings with multiple pptokens in
41 // each one, e.g. @"foo" "bar" @"baz" "qux" which need to be turned into one
42 // StringLiteral for ObjCStringLiteral to hold onto.
43 StringLiteral *S = Strings[0];
44
45 // If we have a multi-part string, merge it all together.
46 if (NumStrings != 1) {
47 // Concatenate objc strings.
48 SmallString<128> StrBuf;
49 SmallVector<SourceLocation, 8> StrLocs;
50
51 for (unsigned i = 0; i != NumStrings; ++i) {
52 S = Strings[i];
53
54 // ObjC strings can't be wide or UTF.
55 if (!S->isAscii()) {
56 Diag(S->getLocStart(), diag::err_cfstring_literal_not_string_constant)
57 << S->getSourceRange();
58 return true;
59 }
60
61 // Append the string.
62 StrBuf += S->getString();
63
64 // Get the locations of the string tokens.
65 StrLocs.append(S->tokloc_begin(), S->tokloc_end());
66 }
67
68 // Create the aggregate string with the appropriate content and location
69 // information.
70 S = StringLiteral::Create(Context, StrBuf,
71 StringLiteral::Ascii, /*Pascal=*/false,
72 Context.getPointerType(Context.CharTy),
73 &StrLocs[0], StrLocs.size());
74 }
75
76 return BuildObjCStringLiteral(AtLocs[0], S);
77 }
78
BuildObjCStringLiteral(SourceLocation AtLoc,StringLiteral * S)79 ExprResult Sema::BuildObjCStringLiteral(SourceLocation AtLoc, StringLiteral *S){
80 // Verify that this composite string is acceptable for ObjC strings.
81 if (CheckObjCString(S))
82 return true;
83
84 // Initialize the constant string interface lazily. This assumes
85 // the NSString interface is seen in this translation unit. Note: We
86 // don't use NSConstantString, since the runtime team considers this
87 // interface private (even though it appears in the header files).
88 QualType Ty = Context.getObjCConstantStringInterface();
89 if (!Ty.isNull()) {
90 Ty = Context.getObjCObjectPointerType(Ty);
91 } else if (getLangOpts().NoConstantCFStrings) {
92 IdentifierInfo *NSIdent=0;
93 std::string StringClass(getLangOpts().ObjCConstantStringClass);
94
95 if (StringClass.empty())
96 NSIdent = &Context.Idents.get("NSConstantString");
97 else
98 NSIdent = &Context.Idents.get(StringClass);
99
100 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
101 LookupOrdinaryName);
102 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
103 Context.setObjCConstantStringInterface(StrIF);
104 Ty = Context.getObjCConstantStringInterface();
105 Ty = Context.getObjCObjectPointerType(Ty);
106 } else {
107 // If there is no NSConstantString interface defined then treat this
108 // as error and recover from it.
109 Diag(S->getLocStart(), diag::err_no_nsconstant_string_class) << NSIdent
110 << S->getSourceRange();
111 Ty = Context.getObjCIdType();
112 }
113 } else {
114 IdentifierInfo *NSIdent = NSAPIObj->getNSClassId(NSAPI::ClassId_NSString);
115 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc,
116 LookupOrdinaryName);
117 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) {
118 Context.setObjCConstantStringInterface(StrIF);
119 Ty = Context.getObjCConstantStringInterface();
120 Ty = Context.getObjCObjectPointerType(Ty);
121 } else {
122 // If there is no NSString interface defined, implicitly declare
123 // a @class NSString; and use that instead. This is to make sure
124 // type of an NSString literal is represented correctly, instead of
125 // being an 'id' type.
126 Ty = Context.getObjCNSStringType();
127 if (Ty.isNull()) {
128 ObjCInterfaceDecl *NSStringIDecl =
129 ObjCInterfaceDecl::Create (Context,
130 Context.getTranslationUnitDecl(),
131 SourceLocation(), NSIdent,
132 0, SourceLocation());
133 Ty = Context.getObjCInterfaceType(NSStringIDecl);
134 Context.setObjCNSStringType(Ty);
135 }
136 Ty = Context.getObjCObjectPointerType(Ty);
137 }
138 }
139
140 return new (Context) ObjCStringLiteral(S, Ty, AtLoc);
141 }
142
143 /// \brief Emits an error if the given method does not exist, or if the return
144 /// type is not an Objective-C object.
validateBoxingMethod(Sema & S,SourceLocation Loc,const ObjCInterfaceDecl * Class,Selector Sel,const ObjCMethodDecl * Method)145 static bool validateBoxingMethod(Sema &S, SourceLocation Loc,
146 const ObjCInterfaceDecl *Class,
147 Selector Sel, const ObjCMethodDecl *Method) {
148 if (!Method) {
149 // FIXME: Is there a better way to avoid quotes than using getName()?
150 S.Diag(Loc, diag::err_undeclared_boxing_method) << Sel << Class->getName();
151 return false;
152 }
153
154 // Make sure the return type is reasonable.
155 QualType ReturnType = Method->getResultType();
156 if (!ReturnType->isObjCObjectPointerType()) {
157 S.Diag(Loc, diag::err_objc_literal_method_sig)
158 << Sel;
159 S.Diag(Method->getLocation(), diag::note_objc_literal_method_return)
160 << ReturnType;
161 return false;
162 }
163
164 return true;
165 }
166
167 /// \brief Retrieve the NSNumber factory method that should be used to create
168 /// an Objective-C literal for the given type.
getNSNumberFactoryMethod(Sema & S,SourceLocation Loc,QualType NumberType,bool isLiteral=false,SourceRange R=SourceRange ())169 static ObjCMethodDecl *getNSNumberFactoryMethod(Sema &S, SourceLocation Loc,
170 QualType NumberType,
171 bool isLiteral = false,
172 SourceRange R = SourceRange()) {
173 Optional<NSAPI::NSNumberLiteralMethodKind> Kind =
174 S.NSAPIObj->getNSNumberFactoryMethodKind(NumberType);
175
176 if (!Kind) {
177 if (isLiteral) {
178 S.Diag(Loc, diag::err_invalid_nsnumber_type)
179 << NumberType << R;
180 }
181 return 0;
182 }
183
184 // If we already looked up this method, we're done.
185 if (S.NSNumberLiteralMethods[*Kind])
186 return S.NSNumberLiteralMethods[*Kind];
187
188 Selector Sel = S.NSAPIObj->getNSNumberLiteralSelector(*Kind,
189 /*Instance=*/false);
190
191 ASTContext &CX = S.Context;
192
193 // Look up the NSNumber class, if we haven't done so already. It's cached
194 // in the Sema instance.
195 if (!S.NSNumberDecl) {
196 IdentifierInfo *NSNumberId =
197 S.NSAPIObj->getNSClassId(NSAPI::ClassId_NSNumber);
198 NamedDecl *IF = S.LookupSingleName(S.TUScope, NSNumberId,
199 Loc, Sema::LookupOrdinaryName);
200 S.NSNumberDecl = dyn_cast_or_null<ObjCInterfaceDecl>(IF);
201 if (!S.NSNumberDecl) {
202 if (S.getLangOpts().DebuggerObjCLiteral) {
203 // Create a stub definition of NSNumber.
204 S.NSNumberDecl = ObjCInterfaceDecl::Create(CX,
205 CX.getTranslationUnitDecl(),
206 SourceLocation(), NSNumberId,
207 0, SourceLocation());
208 } else {
209 // Otherwise, require a declaration of NSNumber.
210 S.Diag(Loc, diag::err_undeclared_nsnumber);
211 return 0;
212 }
213 } else if (!S.NSNumberDecl->hasDefinition()) {
214 S.Diag(Loc, diag::err_undeclared_nsnumber);
215 return 0;
216 }
217
218 // generate the pointer to NSNumber type.
219 QualType NSNumberObject = CX.getObjCInterfaceType(S.NSNumberDecl);
220 S.NSNumberPointer = CX.getObjCObjectPointerType(NSNumberObject);
221 }
222
223 // Look for the appropriate method within NSNumber.
224 ObjCMethodDecl *Method = S.NSNumberDecl->lookupClassMethod(Sel);
225 if (!Method && S.getLangOpts().DebuggerObjCLiteral) {
226 // create a stub definition this NSNumber factory method.
227 TypeSourceInfo *ResultTInfo = 0;
228 Method = ObjCMethodDecl::Create(CX, SourceLocation(), SourceLocation(), Sel,
229 S.NSNumberPointer, ResultTInfo,
230 S.NSNumberDecl,
231 /*isInstance=*/false, /*isVariadic=*/false,
232 /*isPropertyAccessor=*/false,
233 /*isImplicitlyDeclared=*/true,
234 /*isDefined=*/false,
235 ObjCMethodDecl::Required,
236 /*HasRelatedResultType=*/false);
237 ParmVarDecl *value = ParmVarDecl::Create(S.Context, Method,
238 SourceLocation(), SourceLocation(),
239 &CX.Idents.get("value"),
240 NumberType, /*TInfo=*/0, SC_None,
241 0);
242 Method->setMethodParams(S.Context, value, None);
243 }
244
245 if (!validateBoxingMethod(S, Loc, S.NSNumberDecl, Sel, Method))
246 return 0;
247
248 // Note: if the parameter type is out-of-line, we'll catch it later in the
249 // implicit conversion.
250
251 S.NSNumberLiteralMethods[*Kind] = Method;
252 return Method;
253 }
254
255 /// BuildObjCNumericLiteral - builds an ObjCBoxedExpr AST node for the
256 /// numeric literal expression. Type of the expression will be "NSNumber *".
BuildObjCNumericLiteral(SourceLocation AtLoc,Expr * Number)257 ExprResult Sema::BuildObjCNumericLiteral(SourceLocation AtLoc, Expr *Number) {
258 // Determine the type of the literal.
259 QualType NumberType = Number->getType();
260 if (CharacterLiteral *Char = dyn_cast<CharacterLiteral>(Number)) {
261 // In C, character literals have type 'int'. That's not the type we want
262 // to use to determine the Objective-c literal kind.
263 switch (Char->getKind()) {
264 case CharacterLiteral::Ascii:
265 NumberType = Context.CharTy;
266 break;
267
268 case CharacterLiteral::Wide:
269 NumberType = Context.getWideCharType();
270 break;
271
272 case CharacterLiteral::UTF16:
273 NumberType = Context.Char16Ty;
274 break;
275
276 case CharacterLiteral::UTF32:
277 NumberType = Context.Char32Ty;
278 break;
279 }
280 }
281
282 // Look for the appropriate method within NSNumber.
283 // Construct the literal.
284 SourceRange NR(Number->getSourceRange());
285 ObjCMethodDecl *Method = getNSNumberFactoryMethod(*this, AtLoc, NumberType,
286 true, NR);
287 if (!Method)
288 return ExprError();
289
290 // Convert the number to the type that the parameter expects.
291 ParmVarDecl *ParamDecl = Method->param_begin()[0];
292 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
293 ParamDecl);
294 ExprResult ConvertedNumber = PerformCopyInitialization(Entity,
295 SourceLocation(),
296 Owned(Number));
297 if (ConvertedNumber.isInvalid())
298 return ExprError();
299 Number = ConvertedNumber.get();
300
301 // Use the effective source range of the literal, including the leading '@'.
302 return MaybeBindToTemporary(
303 new (Context) ObjCBoxedExpr(Number, NSNumberPointer, Method,
304 SourceRange(AtLoc, NR.getEnd())));
305 }
306
ActOnObjCBoolLiteral(SourceLocation AtLoc,SourceLocation ValueLoc,bool Value)307 ExprResult Sema::ActOnObjCBoolLiteral(SourceLocation AtLoc,
308 SourceLocation ValueLoc,
309 bool Value) {
310 ExprResult Inner;
311 if (getLangOpts().CPlusPlus) {
312 Inner = ActOnCXXBoolLiteral(ValueLoc, Value? tok::kw_true : tok::kw_false);
313 } else {
314 // C doesn't actually have a way to represent literal values of type
315 // _Bool. So, we'll use 0/1 and implicit cast to _Bool.
316 Inner = ActOnIntegerConstant(ValueLoc, Value? 1 : 0);
317 Inner = ImpCastExprToType(Inner.get(), Context.BoolTy,
318 CK_IntegralToBoolean);
319 }
320
321 return BuildObjCNumericLiteral(AtLoc, Inner.get());
322 }
323
324 /// \brief Check that the given expression is a valid element of an Objective-C
325 /// collection literal.
CheckObjCCollectionLiteralElement(Sema & S,Expr * Element,QualType T,bool ArrayLiteral=false)326 static ExprResult CheckObjCCollectionLiteralElement(Sema &S, Expr *Element,
327 QualType T,
328 bool ArrayLiteral = false) {
329 // If the expression is type-dependent, there's nothing for us to do.
330 if (Element->isTypeDependent())
331 return Element;
332
333 ExprResult Result = S.CheckPlaceholderExpr(Element);
334 if (Result.isInvalid())
335 return ExprError();
336 Element = Result.get();
337
338 // In C++, check for an implicit conversion to an Objective-C object pointer
339 // type.
340 if (S.getLangOpts().CPlusPlus && Element->getType()->isRecordType()) {
341 InitializedEntity Entity
342 = InitializedEntity::InitializeParameter(S.Context, T,
343 /*Consumed=*/false);
344 InitializationKind Kind
345 = InitializationKind::CreateCopy(Element->getLocStart(),
346 SourceLocation());
347 InitializationSequence Seq(S, Entity, Kind, Element);
348 if (!Seq.Failed())
349 return Seq.Perform(S, Entity, Kind, Element);
350 }
351
352 Expr *OrigElement = Element;
353
354 // Perform lvalue-to-rvalue conversion.
355 Result = S.DefaultLvalueConversion(Element);
356 if (Result.isInvalid())
357 return ExprError();
358 Element = Result.get();
359
360 // Make sure that we have an Objective-C pointer type or block.
361 if (!Element->getType()->isObjCObjectPointerType() &&
362 !Element->getType()->isBlockPointerType()) {
363 bool Recovered = false;
364
365 // If this is potentially an Objective-C numeric literal, add the '@'.
366 if (isa<IntegerLiteral>(OrigElement) ||
367 isa<CharacterLiteral>(OrigElement) ||
368 isa<FloatingLiteral>(OrigElement) ||
369 isa<ObjCBoolLiteralExpr>(OrigElement) ||
370 isa<CXXBoolLiteralExpr>(OrigElement)) {
371 if (S.NSAPIObj->getNSNumberFactoryMethodKind(OrigElement->getType())) {
372 int Which = isa<CharacterLiteral>(OrigElement) ? 1
373 : (isa<CXXBoolLiteralExpr>(OrigElement) ||
374 isa<ObjCBoolLiteralExpr>(OrigElement)) ? 2
375 : 3;
376
377 S.Diag(OrigElement->getLocStart(), diag::err_box_literal_collection)
378 << Which << OrigElement->getSourceRange()
379 << FixItHint::CreateInsertion(OrigElement->getLocStart(), "@");
380
381 Result = S.BuildObjCNumericLiteral(OrigElement->getLocStart(),
382 OrigElement);
383 if (Result.isInvalid())
384 return ExprError();
385
386 Element = Result.get();
387 Recovered = true;
388 }
389 }
390 // If this is potentially an Objective-C string literal, add the '@'.
391 else if (StringLiteral *String = dyn_cast<StringLiteral>(OrigElement)) {
392 if (String->isAscii()) {
393 S.Diag(OrigElement->getLocStart(), diag::err_box_literal_collection)
394 << 0 << OrigElement->getSourceRange()
395 << FixItHint::CreateInsertion(OrigElement->getLocStart(), "@");
396
397 Result = S.BuildObjCStringLiteral(OrigElement->getLocStart(), String);
398 if (Result.isInvalid())
399 return ExprError();
400
401 Element = Result.get();
402 Recovered = true;
403 }
404 }
405
406 if (!Recovered) {
407 S.Diag(Element->getLocStart(), diag::err_invalid_collection_element)
408 << Element->getType();
409 return ExprError();
410 }
411 }
412 if (ArrayLiteral)
413 if (ObjCStringLiteral *getString =
414 dyn_cast<ObjCStringLiteral>(OrigElement)) {
415 if (StringLiteral *SL = getString->getString()) {
416 unsigned numConcat = SL->getNumConcatenated();
417 if (numConcat > 1) {
418 // Only warn if the concatenated string doesn't come from a macro.
419 bool hasMacro = false;
420 for (unsigned i = 0; i < numConcat ; ++i)
421 if (SL->getStrTokenLoc(i).isMacroID()) {
422 hasMacro = true;
423 break;
424 }
425 if (!hasMacro)
426 S.Diag(Element->getLocStart(),
427 diag::warn_concatenated_nsarray_literal)
428 << Element->getType();
429 }
430 }
431 }
432
433 // Make sure that the element has the type that the container factory
434 // function expects.
435 return S.PerformCopyInitialization(
436 InitializedEntity::InitializeParameter(S.Context, T,
437 /*Consumed=*/false),
438 Element->getLocStart(), Element);
439 }
440
BuildObjCBoxedExpr(SourceRange SR,Expr * ValueExpr)441 ExprResult Sema::BuildObjCBoxedExpr(SourceRange SR, Expr *ValueExpr) {
442 if (ValueExpr->isTypeDependent()) {
443 ObjCBoxedExpr *BoxedExpr =
444 new (Context) ObjCBoxedExpr(ValueExpr, Context.DependentTy, NULL, SR);
445 return Owned(BoxedExpr);
446 }
447 ObjCMethodDecl *BoxingMethod = NULL;
448 QualType BoxedType;
449 // Convert the expression to an RValue, so we can check for pointer types...
450 ExprResult RValue = DefaultFunctionArrayLvalueConversion(ValueExpr);
451 if (RValue.isInvalid()) {
452 return ExprError();
453 }
454 ValueExpr = RValue.get();
455 QualType ValueType(ValueExpr->getType());
456 if (const PointerType *PT = ValueType->getAs<PointerType>()) {
457 QualType PointeeType = PT->getPointeeType();
458 if (Context.hasSameUnqualifiedType(PointeeType, Context.CharTy)) {
459
460 if (!NSStringDecl) {
461 IdentifierInfo *NSStringId =
462 NSAPIObj->getNSClassId(NSAPI::ClassId_NSString);
463 NamedDecl *Decl = LookupSingleName(TUScope, NSStringId,
464 SR.getBegin(), LookupOrdinaryName);
465 NSStringDecl = dyn_cast_or_null<ObjCInterfaceDecl>(Decl);
466 if (!NSStringDecl) {
467 if (getLangOpts().DebuggerObjCLiteral) {
468 // Support boxed expressions in the debugger w/o NSString declaration.
469 DeclContext *TU = Context.getTranslationUnitDecl();
470 NSStringDecl = ObjCInterfaceDecl::Create(Context, TU,
471 SourceLocation(),
472 NSStringId,
473 0, SourceLocation());
474 } else {
475 Diag(SR.getBegin(), diag::err_undeclared_nsstring);
476 return ExprError();
477 }
478 } else if (!NSStringDecl->hasDefinition()) {
479 Diag(SR.getBegin(), diag::err_undeclared_nsstring);
480 return ExprError();
481 }
482 assert(NSStringDecl && "NSStringDecl should not be NULL");
483 QualType NSStringObject = Context.getObjCInterfaceType(NSStringDecl);
484 NSStringPointer = Context.getObjCObjectPointerType(NSStringObject);
485 }
486
487 if (!StringWithUTF8StringMethod) {
488 IdentifierInfo *II = &Context.Idents.get("stringWithUTF8String");
489 Selector stringWithUTF8String = Context.Selectors.getUnarySelector(II);
490
491 // Look for the appropriate method within NSString.
492 BoxingMethod = NSStringDecl->lookupClassMethod(stringWithUTF8String);
493 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) {
494 // Debugger needs to work even if NSString hasn't been defined.
495 TypeSourceInfo *ResultTInfo = 0;
496 ObjCMethodDecl *M =
497 ObjCMethodDecl::Create(Context, SourceLocation(), SourceLocation(),
498 stringWithUTF8String, NSStringPointer,
499 ResultTInfo, NSStringDecl,
500 /*isInstance=*/false, /*isVariadic=*/false,
501 /*isPropertyAccessor=*/false,
502 /*isImplicitlyDeclared=*/true,
503 /*isDefined=*/false,
504 ObjCMethodDecl::Required,
505 /*HasRelatedResultType=*/false);
506 QualType ConstCharType = Context.CharTy.withConst();
507 ParmVarDecl *value =
508 ParmVarDecl::Create(Context, M,
509 SourceLocation(), SourceLocation(),
510 &Context.Idents.get("value"),
511 Context.getPointerType(ConstCharType),
512 /*TInfo=*/0,
513 SC_None, 0);
514 M->setMethodParams(Context, value, None);
515 BoxingMethod = M;
516 }
517
518 if (!validateBoxingMethod(*this, SR.getBegin(), NSStringDecl,
519 stringWithUTF8String, BoxingMethod))
520 return ExprError();
521
522 StringWithUTF8StringMethod = BoxingMethod;
523 }
524
525 BoxingMethod = StringWithUTF8StringMethod;
526 BoxedType = NSStringPointer;
527 }
528 } else if (ValueType->isBuiltinType()) {
529 // The other types we support are numeric, char and BOOL/bool. We could also
530 // provide limited support for structure types, such as NSRange, NSRect, and
531 // NSSize. See NSValue (NSValueGeometryExtensions) in <Foundation/NSGeometry.h>
532 // for more details.
533
534 // Check for a top-level character literal.
535 if (const CharacterLiteral *Char =
536 dyn_cast<CharacterLiteral>(ValueExpr->IgnoreParens())) {
537 // In C, character literals have type 'int'. That's not the type we want
538 // to use to determine the Objective-c literal kind.
539 switch (Char->getKind()) {
540 case CharacterLiteral::Ascii:
541 ValueType = Context.CharTy;
542 break;
543
544 case CharacterLiteral::Wide:
545 ValueType = Context.getWideCharType();
546 break;
547
548 case CharacterLiteral::UTF16:
549 ValueType = Context.Char16Ty;
550 break;
551
552 case CharacterLiteral::UTF32:
553 ValueType = Context.Char32Ty;
554 break;
555 }
556 }
557
558 // FIXME: Do I need to do anything special with BoolTy expressions?
559
560 // Look for the appropriate method within NSNumber.
561 BoxingMethod = getNSNumberFactoryMethod(*this, SR.getBegin(), ValueType);
562 BoxedType = NSNumberPointer;
563
564 } else if (const EnumType *ET = ValueType->getAs<EnumType>()) {
565 if (!ET->getDecl()->isComplete()) {
566 Diag(SR.getBegin(), diag::err_objc_incomplete_boxed_expression_type)
567 << ValueType << ValueExpr->getSourceRange();
568 return ExprError();
569 }
570
571 BoxingMethod = getNSNumberFactoryMethod(*this, SR.getBegin(),
572 ET->getDecl()->getIntegerType());
573 BoxedType = NSNumberPointer;
574 }
575
576 if (!BoxingMethod) {
577 Diag(SR.getBegin(), diag::err_objc_illegal_boxed_expression_type)
578 << ValueType << ValueExpr->getSourceRange();
579 return ExprError();
580 }
581
582 // Convert the expression to the type that the parameter requires.
583 ParmVarDecl *ParamDecl = BoxingMethod->param_begin()[0];
584 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
585 ParamDecl);
586 ExprResult ConvertedValueExpr = PerformCopyInitialization(Entity,
587 SourceLocation(),
588 Owned(ValueExpr));
589 if (ConvertedValueExpr.isInvalid())
590 return ExprError();
591 ValueExpr = ConvertedValueExpr.get();
592
593 ObjCBoxedExpr *BoxedExpr =
594 new (Context) ObjCBoxedExpr(ValueExpr, BoxedType,
595 BoxingMethod, SR);
596 return MaybeBindToTemporary(BoxedExpr);
597 }
598
599 /// Build an ObjC subscript pseudo-object expression, given that
600 /// that's supported by the runtime.
BuildObjCSubscriptExpression(SourceLocation RB,Expr * BaseExpr,Expr * IndexExpr,ObjCMethodDecl * getterMethod,ObjCMethodDecl * setterMethod)601 ExprResult Sema::BuildObjCSubscriptExpression(SourceLocation RB, Expr *BaseExpr,
602 Expr *IndexExpr,
603 ObjCMethodDecl *getterMethod,
604 ObjCMethodDecl *setterMethod) {
605 assert(!LangOpts.isSubscriptPointerArithmetic());
606
607 // We can't get dependent types here; our callers should have
608 // filtered them out.
609 assert((!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) &&
610 "base or index cannot have dependent type here");
611
612 // Filter out placeholders in the index. In theory, overloads could
613 // be preserved here, although that might not actually work correctly.
614 ExprResult Result = CheckPlaceholderExpr(IndexExpr);
615 if (Result.isInvalid())
616 return ExprError();
617 IndexExpr = Result.get();
618
619 // Perform lvalue-to-rvalue conversion on the base.
620 Result = DefaultLvalueConversion(BaseExpr);
621 if (Result.isInvalid())
622 return ExprError();
623 BaseExpr = Result.get();
624
625 // Build the pseudo-object expression.
626 return Owned(ObjCSubscriptRefExpr::Create(Context,
627 BaseExpr,
628 IndexExpr,
629 Context.PseudoObjectTy,
630 getterMethod,
631 setterMethod, RB));
632
633 }
634
BuildObjCArrayLiteral(SourceRange SR,MultiExprArg Elements)635 ExprResult Sema::BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements) {
636 // Look up the NSArray class, if we haven't done so already.
637 if (!NSArrayDecl) {
638 NamedDecl *IF = LookupSingleName(TUScope,
639 NSAPIObj->getNSClassId(NSAPI::ClassId_NSArray),
640 SR.getBegin(),
641 LookupOrdinaryName);
642 NSArrayDecl = dyn_cast_or_null<ObjCInterfaceDecl>(IF);
643 if (!NSArrayDecl && getLangOpts().DebuggerObjCLiteral)
644 NSArrayDecl = ObjCInterfaceDecl::Create (Context,
645 Context.getTranslationUnitDecl(),
646 SourceLocation(),
647 NSAPIObj->getNSClassId(NSAPI::ClassId_NSArray),
648 0, SourceLocation());
649
650 if (!NSArrayDecl) {
651 Diag(SR.getBegin(), diag::err_undeclared_nsarray);
652 return ExprError();
653 }
654 }
655
656 // Find the arrayWithObjects:count: method, if we haven't done so already.
657 QualType IdT = Context.getObjCIdType();
658 if (!ArrayWithObjectsMethod) {
659 Selector
660 Sel = NSAPIObj->getNSArraySelector(NSAPI::NSArr_arrayWithObjectsCount);
661 ObjCMethodDecl *Method = NSArrayDecl->lookupClassMethod(Sel);
662 if (!Method && getLangOpts().DebuggerObjCLiteral) {
663 TypeSourceInfo *ResultTInfo = 0;
664 Method = ObjCMethodDecl::Create(Context,
665 SourceLocation(), SourceLocation(), Sel,
666 IdT,
667 ResultTInfo,
668 Context.getTranslationUnitDecl(),
669 false /*Instance*/, false/*isVariadic*/,
670 /*isPropertyAccessor=*/false,
671 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
672 ObjCMethodDecl::Required,
673 false);
674 SmallVector<ParmVarDecl *, 2> Params;
675 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
676 SourceLocation(),
677 SourceLocation(),
678 &Context.Idents.get("objects"),
679 Context.getPointerType(IdT),
680 /*TInfo=*/0, SC_None, 0);
681 Params.push_back(objects);
682 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
683 SourceLocation(),
684 SourceLocation(),
685 &Context.Idents.get("cnt"),
686 Context.UnsignedLongTy,
687 /*TInfo=*/0, SC_None, 0);
688 Params.push_back(cnt);
689 Method->setMethodParams(Context, Params, None);
690 }
691
692 if (!validateBoxingMethod(*this, SR.getBegin(), NSArrayDecl, Sel, Method))
693 return ExprError();
694
695 // Dig out the type that all elements should be converted to.
696 QualType T = Method->param_begin()[0]->getType();
697 const PointerType *PtrT = T->getAs<PointerType>();
698 if (!PtrT ||
699 !Context.hasSameUnqualifiedType(PtrT->getPointeeType(), IdT)) {
700 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
701 << Sel;
702 Diag(Method->param_begin()[0]->getLocation(),
703 diag::note_objc_literal_method_param)
704 << 0 << T
705 << Context.getPointerType(IdT.withConst());
706 return ExprError();
707 }
708
709 // Check that the 'count' parameter is integral.
710 if (!Method->param_begin()[1]->getType()->isIntegerType()) {
711 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
712 << Sel;
713 Diag(Method->param_begin()[1]->getLocation(),
714 diag::note_objc_literal_method_param)
715 << 1
716 << Method->param_begin()[1]->getType()
717 << "integral";
718 return ExprError();
719 }
720
721 // We've found a good +arrayWithObjects:count: method. Save it!
722 ArrayWithObjectsMethod = Method;
723 }
724
725 QualType ObjectsType = ArrayWithObjectsMethod->param_begin()[0]->getType();
726 QualType RequiredType = ObjectsType->castAs<PointerType>()->getPointeeType();
727
728 // Check that each of the elements provided is valid in a collection literal,
729 // performing conversions as necessary.
730 Expr **ElementsBuffer = Elements.data();
731 for (unsigned I = 0, N = Elements.size(); I != N; ++I) {
732 ExprResult Converted = CheckObjCCollectionLiteralElement(*this,
733 ElementsBuffer[I],
734 RequiredType, true);
735 if (Converted.isInvalid())
736 return ExprError();
737
738 ElementsBuffer[I] = Converted.get();
739 }
740
741 QualType Ty
742 = Context.getObjCObjectPointerType(
743 Context.getObjCInterfaceType(NSArrayDecl));
744
745 return MaybeBindToTemporary(
746 ObjCArrayLiteral::Create(Context, Elements, Ty,
747 ArrayWithObjectsMethod, SR));
748 }
749
BuildObjCDictionaryLiteral(SourceRange SR,ObjCDictionaryElement * Elements,unsigned NumElements)750 ExprResult Sema::BuildObjCDictionaryLiteral(SourceRange SR,
751 ObjCDictionaryElement *Elements,
752 unsigned NumElements) {
753 // Look up the NSDictionary class, if we haven't done so already.
754 if (!NSDictionaryDecl) {
755 NamedDecl *IF = LookupSingleName(TUScope,
756 NSAPIObj->getNSClassId(NSAPI::ClassId_NSDictionary),
757 SR.getBegin(), LookupOrdinaryName);
758 NSDictionaryDecl = dyn_cast_or_null<ObjCInterfaceDecl>(IF);
759 if (!NSDictionaryDecl && getLangOpts().DebuggerObjCLiteral)
760 NSDictionaryDecl = ObjCInterfaceDecl::Create (Context,
761 Context.getTranslationUnitDecl(),
762 SourceLocation(),
763 NSAPIObj->getNSClassId(NSAPI::ClassId_NSDictionary),
764 0, SourceLocation());
765
766 if (!NSDictionaryDecl) {
767 Diag(SR.getBegin(), diag::err_undeclared_nsdictionary);
768 return ExprError();
769 }
770 }
771
772 // Find the dictionaryWithObjects:forKeys:count: method, if we haven't done
773 // so already.
774 QualType IdT = Context.getObjCIdType();
775 if (!DictionaryWithObjectsMethod) {
776 Selector Sel = NSAPIObj->getNSDictionarySelector(
777 NSAPI::NSDict_dictionaryWithObjectsForKeysCount);
778 ObjCMethodDecl *Method = NSDictionaryDecl->lookupClassMethod(Sel);
779 if (!Method && getLangOpts().DebuggerObjCLiteral) {
780 Method = ObjCMethodDecl::Create(Context,
781 SourceLocation(), SourceLocation(), Sel,
782 IdT,
783 0 /*TypeSourceInfo */,
784 Context.getTranslationUnitDecl(),
785 false /*Instance*/, false/*isVariadic*/,
786 /*isPropertyAccessor=*/false,
787 /*isImplicitlyDeclared=*/true, /*isDefined=*/false,
788 ObjCMethodDecl::Required,
789 false);
790 SmallVector<ParmVarDecl *, 3> Params;
791 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method,
792 SourceLocation(),
793 SourceLocation(),
794 &Context.Idents.get("objects"),
795 Context.getPointerType(IdT),
796 /*TInfo=*/0, SC_None, 0);
797 Params.push_back(objects);
798 ParmVarDecl *keys = ParmVarDecl::Create(Context, Method,
799 SourceLocation(),
800 SourceLocation(),
801 &Context.Idents.get("keys"),
802 Context.getPointerType(IdT),
803 /*TInfo=*/0, SC_None, 0);
804 Params.push_back(keys);
805 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method,
806 SourceLocation(),
807 SourceLocation(),
808 &Context.Idents.get("cnt"),
809 Context.UnsignedLongTy,
810 /*TInfo=*/0, SC_None, 0);
811 Params.push_back(cnt);
812 Method->setMethodParams(Context, Params, None);
813 }
814
815 if (!validateBoxingMethod(*this, SR.getBegin(), NSDictionaryDecl, Sel,
816 Method))
817 return ExprError();
818
819 // Dig out the type that all values should be converted to.
820 QualType ValueT = Method->param_begin()[0]->getType();
821 const PointerType *PtrValue = ValueT->getAs<PointerType>();
822 if (!PtrValue ||
823 !Context.hasSameUnqualifiedType(PtrValue->getPointeeType(), IdT)) {
824 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
825 << Sel;
826 Diag(Method->param_begin()[0]->getLocation(),
827 diag::note_objc_literal_method_param)
828 << 0 << ValueT
829 << Context.getPointerType(IdT.withConst());
830 return ExprError();
831 }
832
833 // Dig out the type that all keys should be converted to.
834 QualType KeyT = Method->param_begin()[1]->getType();
835 const PointerType *PtrKey = KeyT->getAs<PointerType>();
836 if (!PtrKey ||
837 !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
838 IdT)) {
839 bool err = true;
840 if (PtrKey) {
841 if (QIDNSCopying.isNull()) {
842 // key argument of selector is id<NSCopying>?
843 if (ObjCProtocolDecl *NSCopyingPDecl =
844 LookupProtocol(&Context.Idents.get("NSCopying"), SR.getBegin())) {
845 ObjCProtocolDecl *PQ[] = {NSCopyingPDecl};
846 QIDNSCopying =
847 Context.getObjCObjectType(Context.ObjCBuiltinIdTy,
848 (ObjCProtocolDecl**) PQ,1);
849 QIDNSCopying = Context.getObjCObjectPointerType(QIDNSCopying);
850 }
851 }
852 if (!QIDNSCopying.isNull())
853 err = !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(),
854 QIDNSCopying);
855 }
856
857 if (err) {
858 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
859 << Sel;
860 Diag(Method->param_begin()[1]->getLocation(),
861 diag::note_objc_literal_method_param)
862 << 1 << KeyT
863 << Context.getPointerType(IdT.withConst());
864 return ExprError();
865 }
866 }
867
868 // Check that the 'count' parameter is integral.
869 QualType CountType = Method->param_begin()[2]->getType();
870 if (!CountType->isIntegerType()) {
871 Diag(SR.getBegin(), diag::err_objc_literal_method_sig)
872 << Sel;
873 Diag(Method->param_begin()[2]->getLocation(),
874 diag::note_objc_literal_method_param)
875 << 2 << CountType
876 << "integral";
877 return ExprError();
878 }
879
880 // We've found a good +dictionaryWithObjects:keys:count: method; save it!
881 DictionaryWithObjectsMethod = Method;
882 }
883
884 QualType ValuesT = DictionaryWithObjectsMethod->param_begin()[0]->getType();
885 QualType ValueT = ValuesT->castAs<PointerType>()->getPointeeType();
886 QualType KeysT = DictionaryWithObjectsMethod->param_begin()[1]->getType();
887 QualType KeyT = KeysT->castAs<PointerType>()->getPointeeType();
888
889 // Check that each of the keys and values provided is valid in a collection
890 // literal, performing conversions as necessary.
891 bool HasPackExpansions = false;
892 for (unsigned I = 0, N = NumElements; I != N; ++I) {
893 // Check the key.
894 ExprResult Key = CheckObjCCollectionLiteralElement(*this, Elements[I].Key,
895 KeyT);
896 if (Key.isInvalid())
897 return ExprError();
898
899 // Check the value.
900 ExprResult Value
901 = CheckObjCCollectionLiteralElement(*this, Elements[I].Value, ValueT);
902 if (Value.isInvalid())
903 return ExprError();
904
905 Elements[I].Key = Key.get();
906 Elements[I].Value = Value.get();
907
908 if (Elements[I].EllipsisLoc.isInvalid())
909 continue;
910
911 if (!Elements[I].Key->containsUnexpandedParameterPack() &&
912 !Elements[I].Value->containsUnexpandedParameterPack()) {
913 Diag(Elements[I].EllipsisLoc,
914 diag::err_pack_expansion_without_parameter_packs)
915 << SourceRange(Elements[I].Key->getLocStart(),
916 Elements[I].Value->getLocEnd());
917 return ExprError();
918 }
919
920 HasPackExpansions = true;
921 }
922
923
924 QualType Ty
925 = Context.getObjCObjectPointerType(
926 Context.getObjCInterfaceType(NSDictionaryDecl));
927 return MaybeBindToTemporary(ObjCDictionaryLiteral::Create(
928 Context, makeArrayRef(Elements, NumElements), HasPackExpansions, Ty,
929 DictionaryWithObjectsMethod, SR));
930 }
931
BuildObjCEncodeExpression(SourceLocation AtLoc,TypeSourceInfo * EncodedTypeInfo,SourceLocation RParenLoc)932 ExprResult Sema::BuildObjCEncodeExpression(SourceLocation AtLoc,
933 TypeSourceInfo *EncodedTypeInfo,
934 SourceLocation RParenLoc) {
935 QualType EncodedType = EncodedTypeInfo->getType();
936 QualType StrTy;
937 if (EncodedType->isDependentType())
938 StrTy = Context.DependentTy;
939 else {
940 if (!EncodedType->getAsArrayTypeUnsafe() && //// Incomplete array is handled.
941 !EncodedType->isVoidType()) // void is handled too.
942 if (RequireCompleteType(AtLoc, EncodedType,
943 diag::err_incomplete_type_objc_at_encode,
944 EncodedTypeInfo->getTypeLoc()))
945 return ExprError();
946
947 std::string Str;
948 Context.getObjCEncodingForType(EncodedType, Str);
949
950 // The type of @encode is the same as the type of the corresponding string,
951 // which is an array type.
952 StrTy = Context.CharTy;
953 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1).
954 if (getLangOpts().CPlusPlus || getLangOpts().ConstStrings)
955 StrTy.addConst();
956 StrTy = Context.getConstantArrayType(StrTy, llvm::APInt(32, Str.size()+1),
957 ArrayType::Normal, 0);
958 }
959
960 return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc);
961 }
962
ParseObjCEncodeExpression(SourceLocation AtLoc,SourceLocation EncodeLoc,SourceLocation LParenLoc,ParsedType ty,SourceLocation RParenLoc)963 ExprResult Sema::ParseObjCEncodeExpression(SourceLocation AtLoc,
964 SourceLocation EncodeLoc,
965 SourceLocation LParenLoc,
966 ParsedType ty,
967 SourceLocation RParenLoc) {
968 // FIXME: Preserve type source info ?
969 TypeSourceInfo *TInfo;
970 QualType EncodedType = GetTypeFromParser(ty, &TInfo);
971 if (!TInfo)
972 TInfo = Context.getTrivialTypeSourceInfo(EncodedType,
973 PP.getLocForEndOfToken(LParenLoc));
974
975 return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc);
976 }
977
ParseObjCSelectorExpression(Selector Sel,SourceLocation AtLoc,SourceLocation SelLoc,SourceLocation LParenLoc,SourceLocation RParenLoc)978 ExprResult Sema::ParseObjCSelectorExpression(Selector Sel,
979 SourceLocation AtLoc,
980 SourceLocation SelLoc,
981 SourceLocation LParenLoc,
982 SourceLocation RParenLoc) {
983 ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel,
984 SourceRange(LParenLoc, RParenLoc), false, false);
985 if (!Method)
986 Method = LookupFactoryMethodInGlobalPool(Sel,
987 SourceRange(LParenLoc, RParenLoc));
988 if (!Method) {
989 if (const ObjCMethodDecl *OM = SelectorsForTypoCorrection(Sel)) {
990 Selector MatchedSel = OM->getSelector();
991 SourceRange SelectorRange(LParenLoc.getLocWithOffset(1),
992 RParenLoc.getLocWithOffset(-1));
993 Diag(SelLoc, diag::warn_undeclared_selector_with_typo)
994 << Sel << MatchedSel
995 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
996
997 } else
998 Diag(SelLoc, diag::warn_undeclared_selector) << Sel;
999 }
1000
1001 if (!Method ||
1002 Method->getImplementationControl() != ObjCMethodDecl::Optional) {
1003 llvm::DenseMap<Selector, SourceLocation>::iterator Pos
1004 = ReferencedSelectors.find(Sel);
1005 if (Pos == ReferencedSelectors.end())
1006 ReferencedSelectors.insert(std::make_pair(Sel, AtLoc));
1007 }
1008
1009 // In ARC, forbid the user from using @selector for
1010 // retain/release/autorelease/dealloc/retainCount.
1011 if (getLangOpts().ObjCAutoRefCount) {
1012 switch (Sel.getMethodFamily()) {
1013 case OMF_retain:
1014 case OMF_release:
1015 case OMF_autorelease:
1016 case OMF_retainCount:
1017 case OMF_dealloc:
1018 Diag(AtLoc, diag::err_arc_illegal_selector) <<
1019 Sel << SourceRange(LParenLoc, RParenLoc);
1020 break;
1021
1022 case OMF_None:
1023 case OMF_alloc:
1024 case OMF_copy:
1025 case OMF_finalize:
1026 case OMF_init:
1027 case OMF_mutableCopy:
1028 case OMF_new:
1029 case OMF_self:
1030 case OMF_performSelector:
1031 break;
1032 }
1033 }
1034 QualType Ty = Context.getObjCSelType();
1035 return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc);
1036 }
1037
ParseObjCProtocolExpression(IdentifierInfo * ProtocolId,SourceLocation AtLoc,SourceLocation ProtoLoc,SourceLocation LParenLoc,SourceLocation ProtoIdLoc,SourceLocation RParenLoc)1038 ExprResult Sema::ParseObjCProtocolExpression(IdentifierInfo *ProtocolId,
1039 SourceLocation AtLoc,
1040 SourceLocation ProtoLoc,
1041 SourceLocation LParenLoc,
1042 SourceLocation ProtoIdLoc,
1043 SourceLocation RParenLoc) {
1044 ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoIdLoc);
1045 if (!PDecl) {
1046 Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId;
1047 return true;
1048 }
1049
1050 QualType Ty = Context.getObjCProtoType();
1051 if (Ty.isNull())
1052 return true;
1053 Ty = Context.getObjCObjectPointerType(Ty);
1054 return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, ProtoIdLoc, RParenLoc);
1055 }
1056
1057 /// Try to capture an implicit reference to 'self'.
tryCaptureObjCSelf(SourceLocation Loc)1058 ObjCMethodDecl *Sema::tryCaptureObjCSelf(SourceLocation Loc) {
1059 DeclContext *DC = getFunctionLevelDeclContext();
1060
1061 // If we're not in an ObjC method, error out. Note that, unlike the
1062 // C++ case, we don't require an instance method --- class methods
1063 // still have a 'self', and we really do still need to capture it!
1064 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(DC);
1065 if (!method)
1066 return 0;
1067
1068 tryCaptureVariable(method->getSelfDecl(), Loc);
1069
1070 return method;
1071 }
1072
stripObjCInstanceType(ASTContext & Context,QualType T)1073 static QualType stripObjCInstanceType(ASTContext &Context, QualType T) {
1074 if (T == Context.getObjCInstanceType())
1075 return Context.getObjCIdType();
1076
1077 return T;
1078 }
1079
getMessageSendResultType(QualType ReceiverType,ObjCMethodDecl * Method,bool isClassMessage,bool isSuperMessage)1080 QualType Sema::getMessageSendResultType(QualType ReceiverType,
1081 ObjCMethodDecl *Method,
1082 bool isClassMessage, bool isSuperMessage) {
1083 assert(Method && "Must have a method");
1084 if (!Method->hasRelatedResultType())
1085 return Method->getSendResultType();
1086
1087 // If a method has a related return type:
1088 // - if the method found is an instance method, but the message send
1089 // was a class message send, T is the declared return type of the method
1090 // found
1091 if (Method->isInstanceMethod() && isClassMessage)
1092 return stripObjCInstanceType(Context, Method->getSendResultType());
1093
1094 // - if the receiver is super, T is a pointer to the class of the
1095 // enclosing method definition
1096 if (isSuperMessage) {
1097 if (ObjCMethodDecl *CurMethod = getCurMethodDecl())
1098 if (ObjCInterfaceDecl *Class = CurMethod->getClassInterface())
1099 return Context.getObjCObjectPointerType(
1100 Context.getObjCInterfaceType(Class));
1101 }
1102
1103 // - if the receiver is the name of a class U, T is a pointer to U
1104 if (ReceiverType->getAs<ObjCInterfaceType>() ||
1105 ReceiverType->isObjCQualifiedInterfaceType())
1106 return Context.getObjCObjectPointerType(ReceiverType);
1107 // - if the receiver is of type Class or qualified Class type,
1108 // T is the declared return type of the method.
1109 if (ReceiverType->isObjCClassType() ||
1110 ReceiverType->isObjCQualifiedClassType())
1111 return stripObjCInstanceType(Context, Method->getSendResultType());
1112
1113 // - if the receiver is id, qualified id, Class, or qualified Class, T
1114 // is the receiver type, otherwise
1115 // - T is the type of the receiver expression.
1116 return ReceiverType;
1117 }
1118
1119 /// Look for an ObjC method whose result type exactly matches the given type.
1120 static const ObjCMethodDecl *
findExplicitInstancetypeDeclarer(const ObjCMethodDecl * MD,QualType instancetype)1121 findExplicitInstancetypeDeclarer(const ObjCMethodDecl *MD,
1122 QualType instancetype) {
1123 if (MD->getResultType() == instancetype) return MD;
1124
1125 // For these purposes, a method in an @implementation overrides a
1126 // declaration in the @interface.
1127 if (const ObjCImplDecl *impl =
1128 dyn_cast<ObjCImplDecl>(MD->getDeclContext())) {
1129 const ObjCContainerDecl *iface;
1130 if (const ObjCCategoryImplDecl *catImpl =
1131 dyn_cast<ObjCCategoryImplDecl>(impl)) {
1132 iface = catImpl->getCategoryDecl();
1133 } else {
1134 iface = impl->getClassInterface();
1135 }
1136
1137 const ObjCMethodDecl *ifaceMD =
1138 iface->getMethod(MD->getSelector(), MD->isInstanceMethod());
1139 if (ifaceMD) return findExplicitInstancetypeDeclarer(ifaceMD, instancetype);
1140 }
1141
1142 SmallVector<const ObjCMethodDecl *, 4> overrides;
1143 MD->getOverriddenMethods(overrides);
1144 for (unsigned i = 0, e = overrides.size(); i != e; ++i) {
1145 if (const ObjCMethodDecl *result =
1146 findExplicitInstancetypeDeclarer(overrides[i], instancetype))
1147 return result;
1148 }
1149
1150 return 0;
1151 }
1152
EmitRelatedResultTypeNoteForReturn(QualType destType)1153 void Sema::EmitRelatedResultTypeNoteForReturn(QualType destType) {
1154 // Only complain if we're in an ObjC method and the required return
1155 // type doesn't match the method's declared return type.
1156 ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurContext);
1157 if (!MD || !MD->hasRelatedResultType() ||
1158 Context.hasSameUnqualifiedType(destType, MD->getResultType()))
1159 return;
1160
1161 // Look for a method overridden by this method which explicitly uses
1162 // 'instancetype'.
1163 if (const ObjCMethodDecl *overridden =
1164 findExplicitInstancetypeDeclarer(MD, Context.getObjCInstanceType())) {
1165 SourceLocation loc;
1166 SourceRange range;
1167 if (TypeSourceInfo *TSI = overridden->getResultTypeSourceInfo()) {
1168 range = TSI->getTypeLoc().getSourceRange();
1169 loc = range.getBegin();
1170 }
1171 if (loc.isInvalid())
1172 loc = overridden->getLocation();
1173 Diag(loc, diag::note_related_result_type_explicit)
1174 << /*current method*/ 1 << range;
1175 return;
1176 }
1177
1178 // Otherwise, if we have an interesting method family, note that.
1179 // This should always trigger if the above didn't.
1180 if (ObjCMethodFamily family = MD->getMethodFamily())
1181 Diag(MD->getLocation(), diag::note_related_result_type_family)
1182 << /*current method*/ 1
1183 << family;
1184 }
1185
EmitRelatedResultTypeNote(const Expr * E)1186 void Sema::EmitRelatedResultTypeNote(const Expr *E) {
1187 E = E->IgnoreParenImpCasts();
1188 const ObjCMessageExpr *MsgSend = dyn_cast<ObjCMessageExpr>(E);
1189 if (!MsgSend)
1190 return;
1191
1192 const ObjCMethodDecl *Method = MsgSend->getMethodDecl();
1193 if (!Method)
1194 return;
1195
1196 if (!Method->hasRelatedResultType())
1197 return;
1198
1199 if (Context.hasSameUnqualifiedType(Method->getResultType()
1200 .getNonReferenceType(),
1201 MsgSend->getType()))
1202 return;
1203
1204 if (!Context.hasSameUnqualifiedType(Method->getResultType(),
1205 Context.getObjCInstanceType()))
1206 return;
1207
1208 Diag(Method->getLocation(), diag::note_related_result_type_inferred)
1209 << Method->isInstanceMethod() << Method->getSelector()
1210 << MsgSend->getType();
1211 }
1212
CheckMessageArgumentTypes(QualType ReceiverType,MultiExprArg Args,Selector Sel,ArrayRef<SourceLocation> SelectorLocs,ObjCMethodDecl * Method,bool isClassMessage,bool isSuperMessage,SourceLocation lbrac,SourceLocation rbrac,QualType & ReturnType,ExprValueKind & VK)1213 bool Sema::CheckMessageArgumentTypes(QualType ReceiverType,
1214 MultiExprArg Args,
1215 Selector Sel,
1216 ArrayRef<SourceLocation> SelectorLocs,
1217 ObjCMethodDecl *Method,
1218 bool isClassMessage, bool isSuperMessage,
1219 SourceLocation lbrac, SourceLocation rbrac,
1220 QualType &ReturnType, ExprValueKind &VK) {
1221 SourceLocation SelLoc;
1222 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
1223 SelLoc = SelectorLocs.front();
1224 else
1225 SelLoc = lbrac;
1226
1227 if (!Method) {
1228 // Apply default argument promotion as for (C99 6.5.2.2p6).
1229 for (unsigned i = 0, e = Args.size(); i != e; i++) {
1230 if (Args[i]->isTypeDependent())
1231 continue;
1232
1233 ExprResult result;
1234 if (getLangOpts().DebuggerSupport) {
1235 QualType paramTy; // ignored
1236 result = checkUnknownAnyArg(SelLoc, Args[i], paramTy);
1237 } else {
1238 result = DefaultArgumentPromotion(Args[i]);
1239 }
1240 if (result.isInvalid())
1241 return true;
1242 Args[i] = result.take();
1243 }
1244
1245 unsigned DiagID;
1246 if (getLangOpts().ObjCAutoRefCount)
1247 DiagID = diag::err_arc_method_not_found;
1248 else
1249 DiagID = isClassMessage ? diag::warn_class_method_not_found
1250 : diag::warn_inst_method_not_found;
1251 if (!getLangOpts().DebuggerSupport) {
1252 const ObjCMethodDecl *OMD = SelectorsForTypoCorrection(Sel, ReceiverType);
1253 if (OMD && !OMD->isInvalidDecl()) {
1254 if (getLangOpts().ObjCAutoRefCount)
1255 DiagID = diag::error_method_not_found_with_typo;
1256 else
1257 DiagID = isClassMessage ? diag::warn_class_method_not_found_with_typo
1258 : diag::warn_instance_method_not_found_with_typo;
1259 Selector MatchedSel = OMD->getSelector();
1260 SourceRange SelectorRange(SelectorLocs.front(), SelectorLocs.back());
1261 Diag(SelLoc, DiagID)
1262 << Sel<< isClassMessage << MatchedSel
1263 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString());
1264 }
1265 else
1266 Diag(SelLoc, DiagID)
1267 << Sel << isClassMessage << SourceRange(SelectorLocs.front(),
1268 SelectorLocs.back());
1269 // Find the class to which we are sending this message.
1270 if (ReceiverType->isObjCObjectPointerType()) {
1271 if (ObjCInterfaceDecl *Class =
1272 ReceiverType->getAs<ObjCObjectPointerType>()->getInterfaceDecl())
1273 Diag(Class->getLocation(), diag::note_receiver_class_declared);
1274 }
1275 }
1276
1277 // In debuggers, we want to use __unknown_anytype for these
1278 // results so that clients can cast them.
1279 if (getLangOpts().DebuggerSupport) {
1280 ReturnType = Context.UnknownAnyTy;
1281 } else {
1282 ReturnType = Context.getObjCIdType();
1283 }
1284 VK = VK_RValue;
1285 return false;
1286 }
1287
1288 ReturnType = getMessageSendResultType(ReceiverType, Method, isClassMessage,
1289 isSuperMessage);
1290 VK = Expr::getValueKindForType(Method->getResultType());
1291
1292 unsigned NumNamedArgs = Sel.getNumArgs();
1293 // Method might have more arguments than selector indicates. This is due
1294 // to addition of c-style arguments in method.
1295 if (Method->param_size() > Sel.getNumArgs())
1296 NumNamedArgs = Method->param_size();
1297 // FIXME. This need be cleaned up.
1298 if (Args.size() < NumNamedArgs) {
1299 Diag(SelLoc, diag::err_typecheck_call_too_few_args)
1300 << 2 << NumNamedArgs << static_cast<unsigned>(Args.size());
1301 return false;
1302 }
1303
1304 bool IsError = false;
1305 for (unsigned i = 0; i < NumNamedArgs; i++) {
1306 // We can't do any type-checking on a type-dependent argument.
1307 if (Args[i]->isTypeDependent())
1308 continue;
1309
1310 Expr *argExpr = Args[i];
1311
1312 ParmVarDecl *param = Method->param_begin()[i];
1313 assert(argExpr && "CheckMessageArgumentTypes(): missing expression");
1314
1315 // Strip the unbridged-cast placeholder expression off unless it's
1316 // a consumed argument.
1317 if (argExpr->hasPlaceholderType(BuiltinType::ARCUnbridgedCast) &&
1318 !param->hasAttr<CFConsumedAttr>())
1319 argExpr = stripARCUnbridgedCast(argExpr);
1320
1321 // If the parameter is __unknown_anytype, infer its type
1322 // from the argument.
1323 if (param->getType() == Context.UnknownAnyTy) {
1324 QualType paramType;
1325 ExprResult argE = checkUnknownAnyArg(SelLoc, argExpr, paramType);
1326 if (argE.isInvalid()) {
1327 IsError = true;
1328 } else {
1329 Args[i] = argE.take();
1330
1331 // Update the parameter type in-place.
1332 param->setType(paramType);
1333 }
1334 continue;
1335 }
1336
1337 if (RequireCompleteType(argExpr->getSourceRange().getBegin(),
1338 param->getType(),
1339 diag::err_call_incomplete_argument, argExpr))
1340 return true;
1341
1342 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context,
1343 param);
1344 ExprResult ArgE = PerformCopyInitialization(Entity, SelLoc, Owned(argExpr));
1345 if (ArgE.isInvalid())
1346 IsError = true;
1347 else
1348 Args[i] = ArgE.takeAs<Expr>();
1349 }
1350
1351 // Promote additional arguments to variadic methods.
1352 if (Method->isVariadic()) {
1353 for (unsigned i = NumNamedArgs, e = Args.size(); i < e; ++i) {
1354 if (Args[i]->isTypeDependent())
1355 continue;
1356
1357 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod,
1358 0);
1359 IsError |= Arg.isInvalid();
1360 Args[i] = Arg.take();
1361 }
1362 } else {
1363 // Check for extra arguments to non-variadic methods.
1364 if (Args.size() != NumNamedArgs) {
1365 Diag(Args[NumNamedArgs]->getLocStart(),
1366 diag::err_typecheck_call_too_many_args)
1367 << 2 /*method*/ << NumNamedArgs << static_cast<unsigned>(Args.size())
1368 << Method->getSourceRange()
1369 << SourceRange(Args[NumNamedArgs]->getLocStart(),
1370 Args.back()->getLocEnd());
1371 }
1372 }
1373
1374 DiagnoseSentinelCalls(Method, SelLoc, Args);
1375
1376 // Do additional checkings on method.
1377 IsError |= CheckObjCMethodCall(
1378 Method, SelLoc, makeArrayRef<const Expr *>(Args.data(), Args.size()));
1379
1380 return IsError;
1381 }
1382
isSelfExpr(Expr * receiver)1383 bool Sema::isSelfExpr(Expr *receiver) {
1384 // 'self' is objc 'self' in an objc method only.
1385 ObjCMethodDecl *method =
1386 dyn_cast_or_null<ObjCMethodDecl>(CurContext->getNonClosureAncestor());
1387 if (!method) return false;
1388
1389 receiver = receiver->IgnoreParenLValueCasts();
1390 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(receiver))
1391 if (DRE->getDecl() == method->getSelfDecl())
1392 return true;
1393 return false;
1394 }
1395
1396 /// LookupMethodInType - Look up a method in an ObjCObjectType.
LookupMethodInObjectType(Selector sel,QualType type,bool isInstance)1397 ObjCMethodDecl *Sema::LookupMethodInObjectType(Selector sel, QualType type,
1398 bool isInstance) {
1399 const ObjCObjectType *objType = type->castAs<ObjCObjectType>();
1400 if (ObjCInterfaceDecl *iface = objType->getInterface()) {
1401 // Look it up in the main interface (and categories, etc.)
1402 if (ObjCMethodDecl *method = iface->lookupMethod(sel, isInstance))
1403 return method;
1404
1405 // Okay, look for "private" methods declared in any
1406 // @implementations we've seen.
1407 if (ObjCMethodDecl *method = iface->lookupPrivateMethod(sel, isInstance))
1408 return method;
1409 }
1410
1411 // Check qualifiers.
1412 for (ObjCObjectType::qual_iterator
1413 i = objType->qual_begin(), e = objType->qual_end(); i != e; ++i)
1414 if (ObjCMethodDecl *method = (*i)->lookupMethod(sel, isInstance))
1415 return method;
1416
1417 return 0;
1418 }
1419
1420 /// LookupMethodInQualifiedType - Lookups up a method in protocol qualifier
1421 /// list of a qualified objective pointer type.
LookupMethodInQualifiedType(Selector Sel,const ObjCObjectPointerType * OPT,bool Instance)1422 ObjCMethodDecl *Sema::LookupMethodInQualifiedType(Selector Sel,
1423 const ObjCObjectPointerType *OPT,
1424 bool Instance)
1425 {
1426 ObjCMethodDecl *MD = 0;
1427 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(),
1428 E = OPT->qual_end(); I != E; ++I) {
1429 ObjCProtocolDecl *PROTO = (*I);
1430 if ((MD = PROTO->lookupMethod(Sel, Instance))) {
1431 return MD;
1432 }
1433 }
1434 return 0;
1435 }
1436
DiagnoseARCUseOfWeakReceiver(Sema & S,Expr * Receiver)1437 static void DiagnoseARCUseOfWeakReceiver(Sema &S, Expr *Receiver) {
1438 if (!Receiver)
1439 return;
1440
1441 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(Receiver))
1442 Receiver = OVE->getSourceExpr();
1443
1444 Expr *RExpr = Receiver->IgnoreParenImpCasts();
1445 SourceLocation Loc = RExpr->getLocStart();
1446 QualType T = RExpr->getType();
1447 const ObjCPropertyDecl *PDecl = 0;
1448 const ObjCMethodDecl *GDecl = 0;
1449 if (PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(RExpr)) {
1450 RExpr = POE->getSyntacticForm();
1451 if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(RExpr)) {
1452 if (PRE->isImplicitProperty()) {
1453 GDecl = PRE->getImplicitPropertyGetter();
1454 if (GDecl) {
1455 T = GDecl->getResultType();
1456 }
1457 }
1458 else {
1459 PDecl = PRE->getExplicitProperty();
1460 if (PDecl) {
1461 T = PDecl->getType();
1462 }
1463 }
1464 }
1465 }
1466 else if (ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(RExpr)) {
1467 // See if receiver is a method which envokes a synthesized getter
1468 // backing a 'weak' property.
1469 ObjCMethodDecl *Method = ME->getMethodDecl();
1470 if (Method && Method->getSelector().getNumArgs() == 0) {
1471 PDecl = Method->findPropertyDecl();
1472 if (PDecl)
1473 T = PDecl->getType();
1474 }
1475 }
1476
1477 if (T.getObjCLifetime() != Qualifiers::OCL_Weak) {
1478 if (!PDecl)
1479 return;
1480 if (!(PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak))
1481 return;
1482 }
1483
1484 S.Diag(Loc, diag::warn_receiver_is_weak)
1485 << ((!PDecl && !GDecl) ? 0 : (PDecl ? 1 : 2));
1486
1487 if (PDecl)
1488 S.Diag(PDecl->getLocation(), diag::note_property_declare);
1489 else if (GDecl)
1490 S.Diag(GDecl->getLocation(), diag::note_method_declared_at) << GDecl;
1491
1492 S.Diag(Loc, diag::note_arc_assign_to_strong);
1493 }
1494
1495 /// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an
1496 /// objective C interface. This is a property reference expression.
1497 ExprResult Sema::
HandleExprPropertyRefExpr(const ObjCObjectPointerType * OPT,Expr * BaseExpr,SourceLocation OpLoc,DeclarationName MemberName,SourceLocation MemberLoc,SourceLocation SuperLoc,QualType SuperType,bool Super)1498 HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT,
1499 Expr *BaseExpr, SourceLocation OpLoc,
1500 DeclarationName MemberName,
1501 SourceLocation MemberLoc,
1502 SourceLocation SuperLoc, QualType SuperType,
1503 bool Super) {
1504 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType();
1505 ObjCInterfaceDecl *IFace = IFaceT->getDecl();
1506
1507 if (!MemberName.isIdentifier()) {
1508 Diag(MemberLoc, diag::err_invalid_property_name)
1509 << MemberName << QualType(OPT, 0);
1510 return ExprError();
1511 }
1512
1513 IdentifierInfo *Member = MemberName.getAsIdentifierInfo();
1514
1515 SourceRange BaseRange = Super? SourceRange(SuperLoc)
1516 : BaseExpr->getSourceRange();
1517 if (RequireCompleteType(MemberLoc, OPT->getPointeeType(),
1518 diag::err_property_not_found_forward_class,
1519 MemberName, BaseRange))
1520 return ExprError();
1521
1522 // Search for a declared property first.
1523 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Member)) {
1524 // Check whether we can reference this property.
1525 if (DiagnoseUseOfDecl(PD, MemberLoc))
1526 return ExprError();
1527 if (Super)
1528 return Owned(new (Context) ObjCPropertyRefExpr(PD, Context.PseudoObjectTy,
1529 VK_LValue, OK_ObjCProperty,
1530 MemberLoc,
1531 SuperLoc, SuperType));
1532 else
1533 return Owned(new (Context) ObjCPropertyRefExpr(PD, Context.PseudoObjectTy,
1534 VK_LValue, OK_ObjCProperty,
1535 MemberLoc, BaseExpr));
1536 }
1537 // Check protocols on qualified interfaces.
1538 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(),
1539 E = OPT->qual_end(); I != E; ++I)
1540 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) {
1541 // Check whether we can reference this property.
1542 if (DiagnoseUseOfDecl(PD, MemberLoc))
1543 return ExprError();
1544
1545 if (Super)
1546 return Owned(new (Context) ObjCPropertyRefExpr(PD,
1547 Context.PseudoObjectTy,
1548 VK_LValue,
1549 OK_ObjCProperty,
1550 MemberLoc,
1551 SuperLoc, SuperType));
1552 else
1553 return Owned(new (Context) ObjCPropertyRefExpr(PD,
1554 Context.PseudoObjectTy,
1555 VK_LValue,
1556 OK_ObjCProperty,
1557 MemberLoc,
1558 BaseExpr));
1559 }
1560 // If that failed, look for an "implicit" property by seeing if the nullary
1561 // selector is implemented.
1562
1563 // FIXME: The logic for looking up nullary and unary selectors should be
1564 // shared with the code in ActOnInstanceMessage.
1565
1566 Selector Sel = PP.getSelectorTable().getNullarySelector(Member);
1567 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel);
1568
1569 // May be founf in property's qualified list.
1570 if (!Getter)
1571 Getter = LookupMethodInQualifiedType(Sel, OPT, true);
1572
1573 // If this reference is in an @implementation, check for 'private' methods.
1574 if (!Getter)
1575 Getter = IFace->lookupPrivateMethod(Sel);
1576
1577 if (Getter) {
1578 // Check if we can reference this property.
1579 if (DiagnoseUseOfDecl(Getter, MemberLoc))
1580 return ExprError();
1581 }
1582 // If we found a getter then this may be a valid dot-reference, we
1583 // will look for the matching setter, in case it is needed.
1584 Selector SetterSel =
1585 SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
1586 PP.getSelectorTable(), Member);
1587 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel);
1588
1589 // May be founf in property's qualified list.
1590 if (!Setter)
1591 Setter = LookupMethodInQualifiedType(SetterSel, OPT, true);
1592
1593 if (!Setter) {
1594 // If this reference is in an @implementation, also check for 'private'
1595 // methods.
1596 Setter = IFace->lookupPrivateMethod(SetterSel);
1597 }
1598
1599 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc))
1600 return ExprError();
1601
1602 if (Getter || Setter) {
1603 if (Super)
1604 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter,
1605 Context.PseudoObjectTy,
1606 VK_LValue, OK_ObjCProperty,
1607 MemberLoc,
1608 SuperLoc, SuperType));
1609 else
1610 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter,
1611 Context.PseudoObjectTy,
1612 VK_LValue, OK_ObjCProperty,
1613 MemberLoc, BaseExpr));
1614
1615 }
1616
1617 // Attempt to correct for typos in property names.
1618 DeclFilterCCC<ObjCPropertyDecl> Validator;
1619 if (TypoCorrection Corrected = CorrectTypo(
1620 DeclarationNameInfo(MemberName, MemberLoc), LookupOrdinaryName, NULL,
1621 NULL, Validator, IFace, false, OPT)) {
1622 diagnoseTypo(Corrected, PDiag(diag::err_property_not_found_suggest)
1623 << MemberName << QualType(OPT, 0));
1624 DeclarationName TypoResult = Corrected.getCorrection();
1625 return HandleExprPropertyRefExpr(OPT, BaseExpr, OpLoc,
1626 TypoResult, MemberLoc,
1627 SuperLoc, SuperType, Super);
1628 }
1629 ObjCInterfaceDecl *ClassDeclared;
1630 if (ObjCIvarDecl *Ivar =
1631 IFace->lookupInstanceVariable(Member, ClassDeclared)) {
1632 QualType T = Ivar->getType();
1633 if (const ObjCObjectPointerType * OBJPT =
1634 T->getAsObjCInterfacePointerType()) {
1635 if (RequireCompleteType(MemberLoc, OBJPT->getPointeeType(),
1636 diag::err_property_not_as_forward_class,
1637 MemberName, BaseExpr))
1638 return ExprError();
1639 }
1640 Diag(MemberLoc,
1641 diag::err_ivar_access_using_property_syntax_suggest)
1642 << MemberName << QualType(OPT, 0) << Ivar->getDeclName()
1643 << FixItHint::CreateReplacement(OpLoc, "->");
1644 return ExprError();
1645 }
1646
1647 Diag(MemberLoc, diag::err_property_not_found)
1648 << MemberName << QualType(OPT, 0);
1649 if (Setter)
1650 Diag(Setter->getLocation(), diag::note_getter_unavailable)
1651 << MemberName << BaseExpr->getSourceRange();
1652 return ExprError();
1653 }
1654
1655
1656
1657 ExprResult Sema::
ActOnClassPropertyRefExpr(IdentifierInfo & receiverName,IdentifierInfo & propertyName,SourceLocation receiverNameLoc,SourceLocation propertyNameLoc)1658 ActOnClassPropertyRefExpr(IdentifierInfo &receiverName,
1659 IdentifierInfo &propertyName,
1660 SourceLocation receiverNameLoc,
1661 SourceLocation propertyNameLoc) {
1662
1663 IdentifierInfo *receiverNamePtr = &receiverName;
1664 ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr,
1665 receiverNameLoc);
1666
1667 bool IsSuper = false;
1668 if (IFace == 0) {
1669 // If the "receiver" is 'super' in a method, handle it as an expression-like
1670 // property reference.
1671 if (receiverNamePtr->isStr("super")) {
1672 IsSuper = true;
1673
1674 if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf(receiverNameLoc)) {
1675 if (CurMethod->isInstanceMethod()) {
1676 ObjCInterfaceDecl *Super =
1677 CurMethod->getClassInterface()->getSuperClass();
1678 if (!Super) {
1679 // The current class does not have a superclass.
1680 Diag(receiverNameLoc, diag::error_root_class_cannot_use_super)
1681 << CurMethod->getClassInterface()->getIdentifier();
1682 return ExprError();
1683 }
1684 QualType T = Context.getObjCInterfaceType(Super);
1685 T = Context.getObjCObjectPointerType(T);
1686
1687 return HandleExprPropertyRefExpr(T->getAsObjCInterfacePointerType(),
1688 /*BaseExpr*/0,
1689 SourceLocation()/*OpLoc*/,
1690 &propertyName,
1691 propertyNameLoc,
1692 receiverNameLoc, T, true);
1693 }
1694
1695 // Otherwise, if this is a class method, try dispatching to our
1696 // superclass.
1697 IFace = CurMethod->getClassInterface()->getSuperClass();
1698 }
1699 }
1700
1701 if (IFace == 0) {
1702 Diag(receiverNameLoc, diag::err_expected_ident_or_lparen);
1703 return ExprError();
1704 }
1705 }
1706
1707 // Search for a declared property first.
1708 Selector Sel = PP.getSelectorTable().getNullarySelector(&propertyName);
1709 ObjCMethodDecl *Getter = IFace->lookupClassMethod(Sel);
1710
1711 // If this reference is in an @implementation, check for 'private' methods.
1712 if (!Getter)
1713 if (ObjCMethodDecl *CurMeth = getCurMethodDecl())
1714 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface())
1715 if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation())
1716 Getter = ImpDecl->getClassMethod(Sel);
1717
1718 if (Getter) {
1719 // FIXME: refactor/share with ActOnMemberReference().
1720 // Check if we can reference this property.
1721 if (DiagnoseUseOfDecl(Getter, propertyNameLoc))
1722 return ExprError();
1723 }
1724
1725 // Look for the matching setter, in case it is needed.
1726 Selector SetterSel =
1727 SelectorTable::constructSetterSelector(PP.getIdentifierTable(),
1728 PP.getSelectorTable(),
1729 &propertyName);
1730
1731 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel);
1732 if (!Setter) {
1733 // If this reference is in an @implementation, also check for 'private'
1734 // methods.
1735 if (ObjCMethodDecl *CurMeth = getCurMethodDecl())
1736 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface())
1737 if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation())
1738 Setter = ImpDecl->getClassMethod(SetterSel);
1739 }
1740 // Look through local category implementations associated with the class.
1741 if (!Setter)
1742 Setter = IFace->getCategoryClassMethod(SetterSel);
1743
1744 if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc))
1745 return ExprError();
1746
1747 if (Getter || Setter) {
1748 if (IsSuper)
1749 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter,
1750 Context.PseudoObjectTy,
1751 VK_LValue, OK_ObjCProperty,
1752 propertyNameLoc,
1753 receiverNameLoc,
1754 Context.getObjCInterfaceType(IFace)));
1755
1756 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter,
1757 Context.PseudoObjectTy,
1758 VK_LValue, OK_ObjCProperty,
1759 propertyNameLoc,
1760 receiverNameLoc, IFace));
1761 }
1762 return ExprError(Diag(propertyNameLoc, diag::err_property_not_found)
1763 << &propertyName << Context.getObjCInterfaceType(IFace));
1764 }
1765
1766 namespace {
1767
1768 class ObjCInterfaceOrSuperCCC : public CorrectionCandidateCallback {
1769 public:
ObjCInterfaceOrSuperCCC(ObjCMethodDecl * Method)1770 ObjCInterfaceOrSuperCCC(ObjCMethodDecl *Method) {
1771 // Determine whether "super" is acceptable in the current context.
1772 if (Method && Method->getClassInterface())
1773 WantObjCSuper = Method->getClassInterface()->getSuperClass();
1774 }
1775
ValidateCandidate(const TypoCorrection & candidate)1776 virtual bool ValidateCandidate(const TypoCorrection &candidate) {
1777 return candidate.getCorrectionDeclAs<ObjCInterfaceDecl>() ||
1778 candidate.isKeyword("super");
1779 }
1780 };
1781
1782 }
1783
getObjCMessageKind(Scope * S,IdentifierInfo * Name,SourceLocation NameLoc,bool IsSuper,bool HasTrailingDot,ParsedType & ReceiverType)1784 Sema::ObjCMessageKind Sema::getObjCMessageKind(Scope *S,
1785 IdentifierInfo *Name,
1786 SourceLocation NameLoc,
1787 bool IsSuper,
1788 bool HasTrailingDot,
1789 ParsedType &ReceiverType) {
1790 ReceiverType = ParsedType();
1791
1792 // If the identifier is "super" and there is no trailing dot, we're
1793 // messaging super. If the identifier is "super" and there is a
1794 // trailing dot, it's an instance message.
1795 if (IsSuper && S->isInObjcMethodScope())
1796 return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage;
1797
1798 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName);
1799 LookupName(Result, S);
1800
1801 switch (Result.getResultKind()) {
1802 case LookupResult::NotFound:
1803 // Normal name lookup didn't find anything. If we're in an
1804 // Objective-C method, look for ivars. If we find one, we're done!
1805 // FIXME: This is a hack. Ivar lookup should be part of normal
1806 // lookup.
1807 if (ObjCMethodDecl *Method = getCurMethodDecl()) {
1808 if (!Method->getClassInterface()) {
1809 // Fall back: let the parser try to parse it as an instance message.
1810 return ObjCInstanceMessage;
1811 }
1812
1813 ObjCInterfaceDecl *ClassDeclared;
1814 if (Method->getClassInterface()->lookupInstanceVariable(Name,
1815 ClassDeclared))
1816 return ObjCInstanceMessage;
1817 }
1818
1819 // Break out; we'll perform typo correction below.
1820 break;
1821
1822 case LookupResult::NotFoundInCurrentInstantiation:
1823 case LookupResult::FoundOverloaded:
1824 case LookupResult::FoundUnresolvedValue:
1825 case LookupResult::Ambiguous:
1826 Result.suppressDiagnostics();
1827 return ObjCInstanceMessage;
1828
1829 case LookupResult::Found: {
1830 // If the identifier is a class or not, and there is a trailing dot,
1831 // it's an instance message.
1832 if (HasTrailingDot)
1833 return ObjCInstanceMessage;
1834 // We found something. If it's a type, then we have a class
1835 // message. Otherwise, it's an instance message.
1836 NamedDecl *ND = Result.getFoundDecl();
1837 QualType T;
1838 if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND))
1839 T = Context.getObjCInterfaceType(Class);
1840 else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND)) {
1841 T = Context.getTypeDeclType(Type);
1842 DiagnoseUseOfDecl(Type, NameLoc);
1843 }
1844 else
1845 return ObjCInstanceMessage;
1846
1847 // We have a class message, and T is the type we're
1848 // messaging. Build source-location information for it.
1849 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
1850 ReceiverType = CreateParsedType(T, TSInfo);
1851 return ObjCClassMessage;
1852 }
1853 }
1854
1855 ObjCInterfaceOrSuperCCC Validator(getCurMethodDecl());
1856 if (TypoCorrection Corrected =
1857 CorrectTypo(Result.getLookupNameInfo(), Result.getLookupKind(), S,
1858 NULL, Validator, NULL, false, NULL, false)) {
1859 if (Corrected.isKeyword()) {
1860 // If we've found the keyword "super" (the only keyword that would be
1861 // returned by CorrectTypo), this is a send to super.
1862 diagnoseTypo(Corrected,
1863 PDiag(diag::err_unknown_receiver_suggest) << Name);
1864 return ObjCSuperMessage;
1865 } else if (ObjCInterfaceDecl *Class =
1866 Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>()) {
1867 // If we found a declaration, correct when it refers to an Objective-C
1868 // class.
1869 diagnoseTypo(Corrected,
1870 PDiag(diag::err_unknown_receiver_suggest) << Name);
1871 QualType T = Context.getObjCInterfaceType(Class);
1872 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc);
1873 ReceiverType = CreateParsedType(T, TSInfo);
1874 return ObjCClassMessage;
1875 }
1876 }
1877
1878 // Fall back: let the parser try to parse it as an instance message.
1879 return ObjCInstanceMessage;
1880 }
1881
ActOnSuperMessage(Scope * S,SourceLocation SuperLoc,Selector Sel,SourceLocation LBracLoc,ArrayRef<SourceLocation> SelectorLocs,SourceLocation RBracLoc,MultiExprArg Args)1882 ExprResult Sema::ActOnSuperMessage(Scope *S,
1883 SourceLocation SuperLoc,
1884 Selector Sel,
1885 SourceLocation LBracLoc,
1886 ArrayRef<SourceLocation> SelectorLocs,
1887 SourceLocation RBracLoc,
1888 MultiExprArg Args) {
1889 // Determine whether we are inside a method or not.
1890 ObjCMethodDecl *Method = tryCaptureObjCSelf(SuperLoc);
1891 if (!Method) {
1892 Diag(SuperLoc, diag::err_invalid_receiver_to_message_super);
1893 return ExprError();
1894 }
1895
1896 ObjCInterfaceDecl *Class = Method->getClassInterface();
1897 if (!Class) {
1898 Diag(SuperLoc, diag::error_no_super_class_message)
1899 << Method->getDeclName();
1900 return ExprError();
1901 }
1902
1903 ObjCInterfaceDecl *Super = Class->getSuperClass();
1904 if (!Super) {
1905 // The current class does not have a superclass.
1906 Diag(SuperLoc, diag::error_root_class_cannot_use_super)
1907 << Class->getIdentifier();
1908 return ExprError();
1909 }
1910
1911 // We are in a method whose class has a superclass, so 'super'
1912 // is acting as a keyword.
1913 if (Method->getSelector() == Sel)
1914 getCurFunction()->ObjCShouldCallSuper = false;
1915
1916 if (Method->isInstanceMethod()) {
1917 // Since we are in an instance method, this is an instance
1918 // message to the superclass instance.
1919 QualType SuperTy = Context.getObjCInterfaceType(Super);
1920 SuperTy = Context.getObjCObjectPointerType(SuperTy);
1921 return BuildInstanceMessage(0, SuperTy, SuperLoc,
1922 Sel, /*Method=*/0,
1923 LBracLoc, SelectorLocs, RBracLoc, Args);
1924 }
1925
1926 // Since we are in a class method, this is a class message to
1927 // the superclass.
1928 return BuildClassMessage(/*ReceiverTypeInfo=*/0,
1929 Context.getObjCInterfaceType(Super),
1930 SuperLoc, Sel, /*Method=*/0,
1931 LBracLoc, SelectorLocs, RBracLoc, Args);
1932 }
1933
1934
BuildClassMessageImplicit(QualType ReceiverType,bool isSuperReceiver,SourceLocation Loc,Selector Sel,ObjCMethodDecl * Method,MultiExprArg Args)1935 ExprResult Sema::BuildClassMessageImplicit(QualType ReceiverType,
1936 bool isSuperReceiver,
1937 SourceLocation Loc,
1938 Selector Sel,
1939 ObjCMethodDecl *Method,
1940 MultiExprArg Args) {
1941 TypeSourceInfo *receiverTypeInfo = 0;
1942 if (!ReceiverType.isNull())
1943 receiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType);
1944
1945 return BuildClassMessage(receiverTypeInfo, ReceiverType,
1946 /*SuperLoc=*/isSuperReceiver ? Loc : SourceLocation(),
1947 Sel, Method, Loc, Loc, Loc, Args,
1948 /*isImplicit=*/true);
1949
1950 }
1951
applyCocoaAPICheck(Sema & S,const ObjCMessageExpr * Msg,unsigned DiagID,bool (* refactor)(const ObjCMessageExpr *,const NSAPI &,edit::Commit &))1952 static void applyCocoaAPICheck(Sema &S, const ObjCMessageExpr *Msg,
1953 unsigned DiagID,
1954 bool (*refactor)(const ObjCMessageExpr *,
1955 const NSAPI &, edit::Commit &)) {
1956 SourceLocation MsgLoc = Msg->getExprLoc();
1957 if (S.Diags.getDiagnosticLevel(DiagID, MsgLoc) == DiagnosticsEngine::Ignored)
1958 return;
1959
1960 SourceManager &SM = S.SourceMgr;
1961 edit::Commit ECommit(SM, S.LangOpts);
1962 if (refactor(Msg,*S.NSAPIObj, ECommit)) {
1963 DiagnosticBuilder Builder = S.Diag(MsgLoc, DiagID)
1964 << Msg->getSelector() << Msg->getSourceRange();
1965 // FIXME: Don't emit diagnostic at all if fixits are non-commitable.
1966 if (!ECommit.isCommitable())
1967 return;
1968 for (edit::Commit::edit_iterator
1969 I = ECommit.edit_begin(), E = ECommit.edit_end(); I != E; ++I) {
1970 const edit::Commit::Edit &Edit = *I;
1971 switch (Edit.Kind) {
1972 case edit::Commit::Act_Insert:
1973 Builder.AddFixItHint(FixItHint::CreateInsertion(Edit.OrigLoc,
1974 Edit.Text,
1975 Edit.BeforePrev));
1976 break;
1977 case edit::Commit::Act_InsertFromRange:
1978 Builder.AddFixItHint(
1979 FixItHint::CreateInsertionFromRange(Edit.OrigLoc,
1980 Edit.getInsertFromRange(SM),
1981 Edit.BeforePrev));
1982 break;
1983 case edit::Commit::Act_Remove:
1984 Builder.AddFixItHint(FixItHint::CreateRemoval(Edit.getFileRange(SM)));
1985 break;
1986 }
1987 }
1988 }
1989 }
1990
checkCocoaAPI(Sema & S,const ObjCMessageExpr * Msg)1991 static void checkCocoaAPI(Sema &S, const ObjCMessageExpr *Msg) {
1992 applyCocoaAPICheck(S, Msg, diag::warn_objc_redundant_literal_use,
1993 edit::rewriteObjCRedundantCallWithLiteral);
1994 }
1995
1996 /// \brief Build an Objective-C class message expression.
1997 ///
1998 /// This routine takes care of both normal class messages and
1999 /// class messages to the superclass.
2000 ///
2001 /// \param ReceiverTypeInfo Type source information that describes the
2002 /// receiver of this message. This may be NULL, in which case we are
2003 /// sending to the superclass and \p SuperLoc must be a valid source
2004 /// location.
2005
2006 /// \param ReceiverType The type of the object receiving the
2007 /// message. When \p ReceiverTypeInfo is non-NULL, this is the same
2008 /// type as that refers to. For a superclass send, this is the type of
2009 /// the superclass.
2010 ///
2011 /// \param SuperLoc The location of the "super" keyword in a
2012 /// superclass message.
2013 ///
2014 /// \param Sel The selector to which the message is being sent.
2015 ///
2016 /// \param Method The method that this class message is invoking, if
2017 /// already known.
2018 ///
2019 /// \param LBracLoc The location of the opening square bracket ']'.
2020 ///
2021 /// \param RBracLoc The location of the closing square bracket ']'.
2022 ///
2023 /// \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)2024 ExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo,
2025 QualType ReceiverType,
2026 SourceLocation SuperLoc,
2027 Selector Sel,
2028 ObjCMethodDecl *Method,
2029 SourceLocation LBracLoc,
2030 ArrayRef<SourceLocation> SelectorLocs,
2031 SourceLocation RBracLoc,
2032 MultiExprArg ArgsIn,
2033 bool isImplicit) {
2034 SourceLocation Loc = SuperLoc.isValid()? SuperLoc
2035 : ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin();
2036 if (LBracLoc.isInvalid()) {
2037 Diag(Loc, diag::err_missing_open_square_message_send)
2038 << FixItHint::CreateInsertion(Loc, "[");
2039 LBracLoc = Loc;
2040 }
2041 SourceLocation SelLoc;
2042 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2043 SelLoc = SelectorLocs.front();
2044 else
2045 SelLoc = Loc;
2046
2047 if (ReceiverType->isDependentType()) {
2048 // If the receiver type is dependent, we can't type-check anything
2049 // at this point. Build a dependent expression.
2050 unsigned NumArgs = ArgsIn.size();
2051 Expr **Args = ArgsIn.data();
2052 assert(SuperLoc.isInvalid() && "Message to super with dependent type");
2053 return Owned(ObjCMessageExpr::Create(Context, ReceiverType,
2054 VK_RValue, LBracLoc, ReceiverTypeInfo,
2055 Sel, SelectorLocs, /*Method=*/0,
2056 makeArrayRef(Args, NumArgs),RBracLoc,
2057 isImplicit));
2058 }
2059
2060 // Find the class to which we are sending this message.
2061 ObjCInterfaceDecl *Class = 0;
2062 const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>();
2063 if (!ClassType || !(Class = ClassType->getInterface())) {
2064 Diag(Loc, diag::err_invalid_receiver_class_message)
2065 << ReceiverType;
2066 return ExprError();
2067 }
2068 assert(Class && "We don't know which class we're messaging?");
2069 // objc++ diagnoses during typename annotation.
2070 if (!getLangOpts().CPlusPlus)
2071 (void)DiagnoseUseOfDecl(Class, SelLoc);
2072 // Find the method we are messaging.
2073 if (!Method) {
2074 SourceRange TypeRange
2075 = SuperLoc.isValid()? SourceRange(SuperLoc)
2076 : ReceiverTypeInfo->getTypeLoc().getSourceRange();
2077 if (RequireCompleteType(Loc, Context.getObjCInterfaceType(Class),
2078 (getLangOpts().ObjCAutoRefCount
2079 ? diag::err_arc_receiver_forward_class
2080 : diag::warn_receiver_forward_class),
2081 TypeRange)) {
2082 // A forward class used in messaging is treated as a 'Class'
2083 Method = LookupFactoryMethodInGlobalPool(Sel,
2084 SourceRange(LBracLoc, RBracLoc));
2085 if (Method && !getLangOpts().ObjCAutoRefCount)
2086 Diag(Method->getLocation(), diag::note_method_sent_forward_class)
2087 << Method->getDeclName();
2088 }
2089 if (!Method)
2090 Method = Class->lookupClassMethod(Sel);
2091
2092 // If we have an implementation in scope, check "private" methods.
2093 if (!Method)
2094 Method = Class->lookupPrivateClassMethod(Sel);
2095
2096 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2097 return ExprError();
2098 }
2099
2100 // Check the argument types and determine the result type.
2101 QualType ReturnType;
2102 ExprValueKind VK = VK_RValue;
2103
2104 unsigned NumArgs = ArgsIn.size();
2105 Expr **Args = ArgsIn.data();
2106 if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2107 Sel, SelectorLocs,
2108 Method, true,
2109 SuperLoc.isValid(), LBracLoc, RBracLoc,
2110 ReturnType, VK))
2111 return ExprError();
2112
2113 if (Method && !Method->getResultType()->isVoidType() &&
2114 RequireCompleteType(LBracLoc, Method->getResultType(),
2115 diag::err_illegal_message_expr_incomplete_type))
2116 return ExprError();
2117
2118 // Construct the appropriate ObjCMessageExpr.
2119 ObjCMessageExpr *Result;
2120 if (SuperLoc.isValid())
2121 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2122 SuperLoc, /*IsInstanceSuper=*/false,
2123 ReceiverType, Sel, SelectorLocs,
2124 Method, makeArrayRef(Args, NumArgs),
2125 RBracLoc, isImplicit);
2126 else {
2127 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2128 ReceiverTypeInfo, Sel, SelectorLocs,
2129 Method, makeArrayRef(Args, NumArgs),
2130 RBracLoc, isImplicit);
2131 if (!isImplicit)
2132 checkCocoaAPI(*this, Result);
2133 }
2134 return MaybeBindToTemporary(Result);
2135 }
2136
2137 // ActOnClassMessage - used for both unary and keyword messages.
2138 // ArgExprs is optional - if it is present, the number of expressions
2139 // is obtained from Sel.getNumArgs().
ActOnClassMessage(Scope * S,ParsedType Receiver,Selector Sel,SourceLocation LBracLoc,ArrayRef<SourceLocation> SelectorLocs,SourceLocation RBracLoc,MultiExprArg Args)2140 ExprResult Sema::ActOnClassMessage(Scope *S,
2141 ParsedType Receiver,
2142 Selector Sel,
2143 SourceLocation LBracLoc,
2144 ArrayRef<SourceLocation> SelectorLocs,
2145 SourceLocation RBracLoc,
2146 MultiExprArg Args) {
2147 TypeSourceInfo *ReceiverTypeInfo;
2148 QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo);
2149 if (ReceiverType.isNull())
2150 return ExprError();
2151
2152
2153 if (!ReceiverTypeInfo)
2154 ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc);
2155
2156 return BuildClassMessage(ReceiverTypeInfo, ReceiverType,
2157 /*SuperLoc=*/SourceLocation(), Sel, /*Method=*/0,
2158 LBracLoc, SelectorLocs, RBracLoc, Args);
2159 }
2160
BuildInstanceMessageImplicit(Expr * Receiver,QualType ReceiverType,SourceLocation Loc,Selector Sel,ObjCMethodDecl * Method,MultiExprArg Args)2161 ExprResult Sema::BuildInstanceMessageImplicit(Expr *Receiver,
2162 QualType ReceiverType,
2163 SourceLocation Loc,
2164 Selector Sel,
2165 ObjCMethodDecl *Method,
2166 MultiExprArg Args) {
2167 return BuildInstanceMessage(Receiver, ReceiverType,
2168 /*SuperLoc=*/!Receiver ? Loc : SourceLocation(),
2169 Sel, Method, Loc, Loc, Loc, Args,
2170 /*isImplicit=*/true);
2171 }
2172
2173 /// \brief Build an Objective-C instance message expression.
2174 ///
2175 /// This routine takes care of both normal instance messages and
2176 /// instance messages to the superclass instance.
2177 ///
2178 /// \param Receiver The expression that computes the object that will
2179 /// receive this message. This may be empty, in which case we are
2180 /// sending to the superclass instance and \p SuperLoc must be a valid
2181 /// source location.
2182 ///
2183 /// \param ReceiverType The (static) type of the object receiving the
2184 /// message. When a \p Receiver expression is provided, this is the
2185 /// same type as that expression. For a superclass instance send, this
2186 /// is a pointer to the type of the superclass.
2187 ///
2188 /// \param SuperLoc The location of the "super" keyword in a
2189 /// superclass instance message.
2190 ///
2191 /// \param Sel The selector to which the message is being sent.
2192 ///
2193 /// \param Method The method that this instance message is invoking, if
2194 /// already known.
2195 ///
2196 /// \param LBracLoc The location of the opening square bracket ']'.
2197 ///
2198 /// \param RBracLoc The location of the closing square bracket ']'.
2199 ///
2200 /// \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)2201 ExprResult Sema::BuildInstanceMessage(Expr *Receiver,
2202 QualType ReceiverType,
2203 SourceLocation SuperLoc,
2204 Selector Sel,
2205 ObjCMethodDecl *Method,
2206 SourceLocation LBracLoc,
2207 ArrayRef<SourceLocation> SelectorLocs,
2208 SourceLocation RBracLoc,
2209 MultiExprArg ArgsIn,
2210 bool isImplicit) {
2211 // The location of the receiver.
2212 SourceLocation Loc = SuperLoc.isValid()? SuperLoc : Receiver->getLocStart();
2213 SourceRange RecRange =
2214 SuperLoc.isValid()? SuperLoc : Receiver->getSourceRange();
2215 SourceLocation SelLoc;
2216 if (!SelectorLocs.empty() && SelectorLocs.front().isValid())
2217 SelLoc = SelectorLocs.front();
2218 else
2219 SelLoc = Loc;
2220
2221 if (LBracLoc.isInvalid()) {
2222 Diag(Loc, diag::err_missing_open_square_message_send)
2223 << FixItHint::CreateInsertion(Loc, "[");
2224 LBracLoc = Loc;
2225 }
2226
2227 // If we have a receiver expression, perform appropriate promotions
2228 // and determine receiver type.
2229 if (Receiver) {
2230 if (Receiver->hasPlaceholderType()) {
2231 ExprResult Result;
2232 if (Receiver->getType() == Context.UnknownAnyTy)
2233 Result = forceUnknownAnyToType(Receiver, Context.getObjCIdType());
2234 else
2235 Result = CheckPlaceholderExpr(Receiver);
2236 if (Result.isInvalid()) return ExprError();
2237 Receiver = Result.take();
2238 }
2239
2240 if (Receiver->isTypeDependent()) {
2241 // If the receiver is type-dependent, we can't type-check anything
2242 // at this point. Build a dependent expression.
2243 unsigned NumArgs = ArgsIn.size();
2244 Expr **Args = ArgsIn.data();
2245 assert(SuperLoc.isInvalid() && "Message to super with dependent type");
2246 return Owned(ObjCMessageExpr::Create(Context, Context.DependentTy,
2247 VK_RValue, LBracLoc, Receiver, Sel,
2248 SelectorLocs, /*Method=*/0,
2249 makeArrayRef(Args, NumArgs),
2250 RBracLoc, isImplicit));
2251 }
2252
2253 // If necessary, apply function/array conversion to the receiver.
2254 // C99 6.7.5.3p[7,8].
2255 ExprResult Result = DefaultFunctionArrayLvalueConversion(Receiver);
2256 if (Result.isInvalid())
2257 return ExprError();
2258 Receiver = Result.take();
2259 ReceiverType = Receiver->getType();
2260
2261 // If the receiver is an ObjC pointer, a block pointer, or an
2262 // __attribute__((NSObject)) pointer, we don't need to do any
2263 // special conversion in order to look up a receiver.
2264 if (ReceiverType->isObjCRetainableType()) {
2265 // do nothing
2266 } else if (!getLangOpts().ObjCAutoRefCount &&
2267 !Context.getObjCIdType().isNull() &&
2268 (ReceiverType->isPointerType() ||
2269 ReceiverType->isIntegerType())) {
2270 // Implicitly convert integers and pointers to 'id' but emit a warning.
2271 // But not in ARC.
2272 Diag(Loc, diag::warn_bad_receiver_type)
2273 << ReceiverType
2274 << Receiver->getSourceRange();
2275 if (ReceiverType->isPointerType()) {
2276 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2277 CK_CPointerToObjCPointerCast).take();
2278 } else {
2279 // TODO: specialized warning on null receivers?
2280 bool IsNull = Receiver->isNullPointerConstant(Context,
2281 Expr::NPC_ValueDependentIsNull);
2282 CastKind Kind = IsNull ? CK_NullToPointer : CK_IntegralToPointer;
2283 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(),
2284 Kind).take();
2285 }
2286 ReceiverType = Receiver->getType();
2287 } else if (getLangOpts().CPlusPlus) {
2288 // The receiver must be a complete type.
2289 if (RequireCompleteType(Loc, Receiver->getType(),
2290 diag::err_incomplete_receiver_type))
2291 return ExprError();
2292
2293 ExprResult result = PerformContextuallyConvertToObjCPointer(Receiver);
2294 if (result.isUsable()) {
2295 Receiver = result.take();
2296 ReceiverType = Receiver->getType();
2297 }
2298 }
2299 }
2300
2301 // There's a somewhat weird interaction here where we assume that we
2302 // won't actually have a method unless we also don't need to do some
2303 // of the more detailed type-checking on the receiver.
2304
2305 if (!Method) {
2306 // Handle messages to id.
2307 bool receiverIsId = ReceiverType->isObjCIdType();
2308 if (receiverIsId || ReceiverType->isBlockPointerType() ||
2309 (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) {
2310 Method = LookupInstanceMethodInGlobalPool(Sel,
2311 SourceRange(LBracLoc, RBracLoc),
2312 receiverIsId);
2313 if (!Method)
2314 Method = LookupFactoryMethodInGlobalPool(Sel,
2315 SourceRange(LBracLoc,RBracLoc),
2316 receiverIsId);
2317 } else if (ReceiverType->isObjCClassType() ||
2318 ReceiverType->isObjCQualifiedClassType()) {
2319 // Handle messages to Class.
2320 // We allow sending a message to a qualified Class ("Class<foo>"), which
2321 // is ok as long as one of the protocols implements the selector (if not, warn).
2322 if (const ObjCObjectPointerType *QClassTy
2323 = ReceiverType->getAsObjCQualifiedClassType()) {
2324 // Search protocols for class methods.
2325 Method = LookupMethodInQualifiedType(Sel, QClassTy, false);
2326 if (!Method) {
2327 Method = LookupMethodInQualifiedType(Sel, QClassTy, true);
2328 // warn if instance method found for a Class message.
2329 if (Method) {
2330 Diag(SelLoc, diag::warn_instance_method_on_class_found)
2331 << Method->getSelector() << Sel;
2332 Diag(Method->getLocation(), diag::note_method_declared_at)
2333 << Method->getDeclName();
2334 }
2335 }
2336 } else {
2337 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) {
2338 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) {
2339 // First check the public methods in the class interface.
2340 Method = ClassDecl->lookupClassMethod(Sel);
2341
2342 if (!Method)
2343 Method = ClassDecl->lookupPrivateClassMethod(Sel);
2344 }
2345 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2346 return ExprError();
2347 }
2348 if (!Method) {
2349 // If not messaging 'self', look for any factory method named 'Sel'.
2350 if (!Receiver || !isSelfExpr(Receiver)) {
2351 Method = LookupFactoryMethodInGlobalPool(Sel,
2352 SourceRange(LBracLoc, RBracLoc),
2353 true);
2354 if (!Method) {
2355 // If no class (factory) method was found, check if an _instance_
2356 // method of the same name exists in the root class only.
2357 Method = LookupInstanceMethodInGlobalPool(Sel,
2358 SourceRange(LBracLoc, RBracLoc),
2359 true);
2360 if (Method)
2361 if (const ObjCInterfaceDecl *ID =
2362 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) {
2363 if (ID->getSuperClass())
2364 Diag(SelLoc, diag::warn_root_inst_method_not_found)
2365 << Sel << SourceRange(LBracLoc, RBracLoc);
2366 }
2367 }
2368 }
2369 }
2370 }
2371 } else {
2372 ObjCInterfaceDecl* ClassDecl = 0;
2373
2374 // We allow sending a message to a qualified ID ("id<foo>"), which is ok as
2375 // long as one of the protocols implements the selector (if not, warn).
2376 // And as long as message is not deprecated/unavailable (warn if it is).
2377 if (const ObjCObjectPointerType *QIdTy
2378 = ReceiverType->getAsObjCQualifiedIdType()) {
2379 // Search protocols for instance methods.
2380 Method = LookupMethodInQualifiedType(Sel, QIdTy, true);
2381 if (!Method)
2382 Method = LookupMethodInQualifiedType(Sel, QIdTy, false);
2383 if (Method && DiagnoseUseOfDecl(Method, SelLoc))
2384 return ExprError();
2385 } else if (const ObjCObjectPointerType *OCIType
2386 = ReceiverType->getAsObjCInterfacePointerType()) {
2387 // We allow sending a message to a pointer to an interface (an object).
2388 ClassDecl = OCIType->getInterfaceDecl();
2389
2390 // Try to complete the type. Under ARC, this is a hard error from which
2391 // we don't try to recover.
2392 const ObjCInterfaceDecl *forwardClass = 0;
2393 if (RequireCompleteType(Loc, OCIType->getPointeeType(),
2394 getLangOpts().ObjCAutoRefCount
2395 ? diag::err_arc_receiver_forward_instance
2396 : diag::warn_receiver_forward_instance,
2397 Receiver? Receiver->getSourceRange()
2398 : SourceRange(SuperLoc))) {
2399 if (getLangOpts().ObjCAutoRefCount)
2400 return ExprError();
2401
2402 forwardClass = OCIType->getInterfaceDecl();
2403 Diag(Receiver ? Receiver->getLocStart()
2404 : SuperLoc, diag::note_receiver_is_id);
2405 Method = 0;
2406 } else {
2407 Method = ClassDecl->lookupInstanceMethod(Sel);
2408 }
2409
2410 if (!Method)
2411 // Search protocol qualifiers.
2412 Method = LookupMethodInQualifiedType(Sel, OCIType, true);
2413
2414 if (!Method) {
2415 // If we have implementations in scope, check "private" methods.
2416 Method = ClassDecl->lookupPrivateMethod(Sel);
2417
2418 if (!Method && getLangOpts().ObjCAutoRefCount) {
2419 Diag(SelLoc, diag::err_arc_may_not_respond)
2420 << OCIType->getPointeeType() << Sel << RecRange
2421 << SourceRange(SelectorLocs.front(), SelectorLocs.back());
2422 return ExprError();
2423 }
2424
2425 if (!Method && (!Receiver || !isSelfExpr(Receiver))) {
2426 // If we still haven't found a method, look in the global pool. This
2427 // behavior isn't very desirable, however we need it for GCC
2428 // compatibility. FIXME: should we deviate??
2429 if (OCIType->qual_empty()) {
2430 Method = LookupInstanceMethodInGlobalPool(Sel,
2431 SourceRange(LBracLoc, RBracLoc));
2432 if (Method && !forwardClass)
2433 Diag(SelLoc, diag::warn_maynot_respond)
2434 << OCIType->getInterfaceDecl()->getIdentifier()
2435 << Sel << RecRange;
2436 }
2437 }
2438 }
2439 if (Method && DiagnoseUseOfDecl(Method, SelLoc, forwardClass))
2440 return ExprError();
2441 } else {
2442 // Reject other random receiver types (e.g. structs).
2443 Diag(Loc, diag::err_bad_receiver_type)
2444 << ReceiverType << Receiver->getSourceRange();
2445 return ExprError();
2446 }
2447 }
2448 }
2449
2450 // Check the message arguments.
2451 unsigned NumArgs = ArgsIn.size();
2452 Expr **Args = ArgsIn.data();
2453 QualType ReturnType;
2454 ExprValueKind VK = VK_RValue;
2455 bool ClassMessage = (ReceiverType->isObjCClassType() ||
2456 ReceiverType->isObjCQualifiedClassType());
2457 if (CheckMessageArgumentTypes(ReceiverType, MultiExprArg(Args, NumArgs),
2458 Sel, SelectorLocs, Method,
2459 ClassMessage, SuperLoc.isValid(),
2460 LBracLoc, RBracLoc, ReturnType, VK))
2461 return ExprError();
2462
2463 if (Method && !Method->getResultType()->isVoidType() &&
2464 RequireCompleteType(LBracLoc, Method->getResultType(),
2465 diag::err_illegal_message_expr_incomplete_type))
2466 return ExprError();
2467
2468 // In ARC, forbid the user from sending messages to
2469 // retain/release/autorelease/dealloc/retainCount explicitly.
2470 if (getLangOpts().ObjCAutoRefCount) {
2471 ObjCMethodFamily family =
2472 (Method ? Method->getMethodFamily() : Sel.getMethodFamily());
2473 switch (family) {
2474 case OMF_init:
2475 if (Method)
2476 checkInitMethod(Method, ReceiverType);
2477
2478 case OMF_None:
2479 case OMF_alloc:
2480 case OMF_copy:
2481 case OMF_finalize:
2482 case OMF_mutableCopy:
2483 case OMF_new:
2484 case OMF_self:
2485 break;
2486
2487 case OMF_dealloc:
2488 case OMF_retain:
2489 case OMF_release:
2490 case OMF_autorelease:
2491 case OMF_retainCount:
2492 Diag(SelLoc, diag::err_arc_illegal_explicit_message)
2493 << Sel << RecRange;
2494 break;
2495
2496 case OMF_performSelector:
2497 if (Method && NumArgs >= 1) {
2498 if (ObjCSelectorExpr *SelExp = dyn_cast<ObjCSelectorExpr>(Args[0])) {
2499 Selector ArgSel = SelExp->getSelector();
2500 ObjCMethodDecl *SelMethod =
2501 LookupInstanceMethodInGlobalPool(ArgSel,
2502 SelExp->getSourceRange());
2503 if (!SelMethod)
2504 SelMethod =
2505 LookupFactoryMethodInGlobalPool(ArgSel,
2506 SelExp->getSourceRange());
2507 if (SelMethod) {
2508 ObjCMethodFamily SelFamily = SelMethod->getMethodFamily();
2509 switch (SelFamily) {
2510 case OMF_alloc:
2511 case OMF_copy:
2512 case OMF_mutableCopy:
2513 case OMF_new:
2514 case OMF_self:
2515 case OMF_init:
2516 // Issue error, unless ns_returns_not_retained.
2517 if (!SelMethod->hasAttr<NSReturnsNotRetainedAttr>()) {
2518 // selector names a +1 method
2519 Diag(SelLoc,
2520 diag::err_arc_perform_selector_retains);
2521 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
2522 << SelMethod->getDeclName();
2523 }
2524 break;
2525 default:
2526 // +0 call. OK. unless ns_returns_retained.
2527 if (SelMethod->hasAttr<NSReturnsRetainedAttr>()) {
2528 // selector names a +1 method
2529 Diag(SelLoc,
2530 diag::err_arc_perform_selector_retains);
2531 Diag(SelMethod->getLocation(), diag::note_method_declared_at)
2532 << SelMethod->getDeclName();
2533 }
2534 break;
2535 }
2536 }
2537 } else {
2538 // error (may leak).
2539 Diag(SelLoc, diag::warn_arc_perform_selector_leaks);
2540 Diag(Args[0]->getExprLoc(), diag::note_used_here);
2541 }
2542 }
2543 break;
2544 }
2545 }
2546
2547 // Construct the appropriate ObjCMessageExpr instance.
2548 ObjCMessageExpr *Result;
2549 if (SuperLoc.isValid())
2550 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2551 SuperLoc, /*IsInstanceSuper=*/true,
2552 ReceiverType, Sel, SelectorLocs, Method,
2553 makeArrayRef(Args, NumArgs), RBracLoc,
2554 isImplicit);
2555 else {
2556 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc,
2557 Receiver, Sel, SelectorLocs, Method,
2558 makeArrayRef(Args, NumArgs), RBracLoc,
2559 isImplicit);
2560 if (!isImplicit)
2561 checkCocoaAPI(*this, Result);
2562 }
2563
2564 if (getLangOpts().ObjCAutoRefCount) {
2565 DiagnoseARCUseOfWeakReceiver(*this, Receiver);
2566
2567 // In ARC, annotate delegate init calls.
2568 if (Result->getMethodFamily() == OMF_init &&
2569 (SuperLoc.isValid() || isSelfExpr(Receiver))) {
2570 // Only consider init calls *directly* in init implementations,
2571 // not within blocks.
2572 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(CurContext);
2573 if (method && method->getMethodFamily() == OMF_init) {
2574 // The implicit assignment to self means we also don't want to
2575 // consume the result.
2576 Result->setDelegateInitCall(true);
2577 return Owned(Result);
2578 }
2579 }
2580
2581 // In ARC, check for message sends which are likely to introduce
2582 // retain cycles.
2583 checkRetainCycles(Result);
2584
2585 if (!isImplicit && Method) {
2586 if (const ObjCPropertyDecl *Prop = Method->findPropertyDecl()) {
2587 bool IsWeak =
2588 Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak;
2589 if (!IsWeak && Sel.isUnarySelector())
2590 IsWeak = ReturnType.getObjCLifetime() & Qualifiers::OCL_Weak;
2591
2592 if (IsWeak) {
2593 DiagnosticsEngine::Level Level =
2594 Diags.getDiagnosticLevel(diag::warn_arc_repeated_use_of_weak,
2595 LBracLoc);
2596 if (Level != DiagnosticsEngine::Ignored)
2597 getCurFunction()->recordUseOfWeak(Result, Prop);
2598
2599 }
2600 }
2601 }
2602 }
2603
2604 return MaybeBindToTemporary(Result);
2605 }
2606
RemoveSelectorFromWarningCache(Sema & S,Expr * Arg)2607 static void RemoveSelectorFromWarningCache(Sema &S, Expr* Arg) {
2608 if (ObjCSelectorExpr *OSE =
2609 dyn_cast<ObjCSelectorExpr>(Arg->IgnoreParenCasts())) {
2610 Selector Sel = OSE->getSelector();
2611 SourceLocation Loc = OSE->getAtLoc();
2612 llvm::DenseMap<Selector, SourceLocation>::iterator Pos
2613 = S.ReferencedSelectors.find(Sel);
2614 if (Pos != S.ReferencedSelectors.end() && Pos->second == Loc)
2615 S.ReferencedSelectors.erase(Pos);
2616 }
2617 }
2618
2619 // ActOnInstanceMessage - used for both unary and keyword messages.
2620 // ArgExprs is optional - if it is present, the number of expressions
2621 // is obtained from Sel.getNumArgs().
ActOnInstanceMessage(Scope * S,Expr * Receiver,Selector Sel,SourceLocation LBracLoc,ArrayRef<SourceLocation> SelectorLocs,SourceLocation RBracLoc,MultiExprArg Args)2622 ExprResult Sema::ActOnInstanceMessage(Scope *S,
2623 Expr *Receiver,
2624 Selector Sel,
2625 SourceLocation LBracLoc,
2626 ArrayRef<SourceLocation> SelectorLocs,
2627 SourceLocation RBracLoc,
2628 MultiExprArg Args) {
2629 if (!Receiver)
2630 return ExprError();
2631
2632 // A ParenListExpr can show up while doing error recovery with invalid code.
2633 if (isa<ParenListExpr>(Receiver)) {
2634 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Receiver);
2635 if (Result.isInvalid()) return ExprError();
2636 Receiver = Result.take();
2637 }
2638
2639 if (RespondsToSelectorSel.isNull()) {
2640 IdentifierInfo *SelectorId = &Context.Idents.get("respondsToSelector");
2641 RespondsToSelectorSel = Context.Selectors.getUnarySelector(SelectorId);
2642 }
2643 if (Sel == RespondsToSelectorSel)
2644 RemoveSelectorFromWarningCache(*this, Args[0]);
2645
2646 return BuildInstanceMessage(Receiver, Receiver->getType(),
2647 /*SuperLoc=*/SourceLocation(), Sel, /*Method=*/0,
2648 LBracLoc, SelectorLocs, RBracLoc, Args);
2649 }
2650
2651 enum ARCConversionTypeClass {
2652 /// int, void, struct A
2653 ACTC_none,
2654
2655 /// id, void (^)()
2656 ACTC_retainable,
2657
2658 /// id*, id***, void (^*)(),
2659 ACTC_indirectRetainable,
2660
2661 /// void* might be a normal C type, or it might a CF type.
2662 ACTC_voidPtr,
2663
2664 /// struct A*
2665 ACTC_coreFoundation
2666 };
isAnyRetainable(ARCConversionTypeClass ACTC)2667 static bool isAnyRetainable(ARCConversionTypeClass ACTC) {
2668 return (ACTC == ACTC_retainable ||
2669 ACTC == ACTC_coreFoundation ||
2670 ACTC == ACTC_voidPtr);
2671 }
isAnyCLike(ARCConversionTypeClass ACTC)2672 static bool isAnyCLike(ARCConversionTypeClass ACTC) {
2673 return ACTC == ACTC_none ||
2674 ACTC == ACTC_voidPtr ||
2675 ACTC == ACTC_coreFoundation;
2676 }
2677
classifyTypeForARCConversion(QualType type)2678 static ARCConversionTypeClass classifyTypeForARCConversion(QualType type) {
2679 bool isIndirect = false;
2680
2681 // Ignore an outermost reference type.
2682 if (const ReferenceType *ref = type->getAs<ReferenceType>()) {
2683 type = ref->getPointeeType();
2684 isIndirect = true;
2685 }
2686
2687 // Drill through pointers and arrays recursively.
2688 while (true) {
2689 if (const PointerType *ptr = type->getAs<PointerType>()) {
2690 type = ptr->getPointeeType();
2691
2692 // The first level of pointer may be the innermost pointer on a CF type.
2693 if (!isIndirect) {
2694 if (type->isVoidType()) return ACTC_voidPtr;
2695 if (type->isRecordType()) return ACTC_coreFoundation;
2696 }
2697 } else if (const ArrayType *array = type->getAsArrayTypeUnsafe()) {
2698 type = QualType(array->getElementType()->getBaseElementTypeUnsafe(), 0);
2699 } else {
2700 break;
2701 }
2702 isIndirect = true;
2703 }
2704
2705 if (isIndirect) {
2706 if (type->isObjCARCBridgableType())
2707 return ACTC_indirectRetainable;
2708 return ACTC_none;
2709 }
2710
2711 if (type->isObjCARCBridgableType())
2712 return ACTC_retainable;
2713
2714 return ACTC_none;
2715 }
2716
2717 namespace {
2718 /// A result from the cast checker.
2719 enum ACCResult {
2720 /// Cannot be casted.
2721 ACC_invalid,
2722
2723 /// Can be safely retained or not retained.
2724 ACC_bottom,
2725
2726 /// Can be casted at +0.
2727 ACC_plusZero,
2728
2729 /// Can be casted at +1.
2730 ACC_plusOne
2731 };
merge(ACCResult left,ACCResult right)2732 ACCResult merge(ACCResult left, ACCResult right) {
2733 if (left == right) return left;
2734 if (left == ACC_bottom) return right;
2735 if (right == ACC_bottom) return left;
2736 return ACC_invalid;
2737 }
2738
2739 /// A checker which white-lists certain expressions whose conversion
2740 /// to or from retainable type would otherwise be forbidden in ARC.
2741 class ARCCastChecker : public StmtVisitor<ARCCastChecker, ACCResult> {
2742 typedef StmtVisitor<ARCCastChecker, ACCResult> super;
2743
2744 ASTContext &Context;
2745 ARCConversionTypeClass SourceClass;
2746 ARCConversionTypeClass TargetClass;
2747 bool Diagnose;
2748
isCFType(QualType type)2749 static bool isCFType(QualType type) {
2750 // Someday this can use ns_bridged. For now, it has to do this.
2751 return type->isCARCBridgableType();
2752 }
2753
2754 public:
ARCCastChecker(ASTContext & Context,ARCConversionTypeClass source,ARCConversionTypeClass target,bool diagnose)2755 ARCCastChecker(ASTContext &Context, ARCConversionTypeClass source,
2756 ARCConversionTypeClass target, bool diagnose)
2757 : Context(Context), SourceClass(source), TargetClass(target),
2758 Diagnose(diagnose) {}
2759
2760 using super::Visit;
Visit(Expr * e)2761 ACCResult Visit(Expr *e) {
2762 return super::Visit(e->IgnoreParens());
2763 }
2764
VisitStmt(Stmt * s)2765 ACCResult VisitStmt(Stmt *s) {
2766 return ACC_invalid;
2767 }
2768
2769 /// Null pointer constants can be casted however you please.
VisitExpr(Expr * e)2770 ACCResult VisitExpr(Expr *e) {
2771 if (e->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull))
2772 return ACC_bottom;
2773 return ACC_invalid;
2774 }
2775
2776 /// Objective-C string literals can be safely casted.
VisitObjCStringLiteral(ObjCStringLiteral * e)2777 ACCResult VisitObjCStringLiteral(ObjCStringLiteral *e) {
2778 // If we're casting to any retainable type, go ahead. Global
2779 // strings are immune to retains, so this is bottom.
2780 if (isAnyRetainable(TargetClass)) return ACC_bottom;
2781
2782 return ACC_invalid;
2783 }
2784
2785 /// Look through certain implicit and explicit casts.
VisitCastExpr(CastExpr * e)2786 ACCResult VisitCastExpr(CastExpr *e) {
2787 switch (e->getCastKind()) {
2788 case CK_NullToPointer:
2789 return ACC_bottom;
2790
2791 case CK_NoOp:
2792 case CK_LValueToRValue:
2793 case CK_BitCast:
2794 case CK_CPointerToObjCPointerCast:
2795 case CK_BlockPointerToObjCPointerCast:
2796 case CK_AnyPointerToBlockPointerCast:
2797 return Visit(e->getSubExpr());
2798
2799 default:
2800 return ACC_invalid;
2801 }
2802 }
2803
2804 /// Look through unary extension.
VisitUnaryExtension(UnaryOperator * e)2805 ACCResult VisitUnaryExtension(UnaryOperator *e) {
2806 return Visit(e->getSubExpr());
2807 }
2808
2809 /// Ignore the LHS of a comma operator.
VisitBinComma(BinaryOperator * e)2810 ACCResult VisitBinComma(BinaryOperator *e) {
2811 return Visit(e->getRHS());
2812 }
2813
2814 /// Conditional operators are okay if both sides are okay.
VisitConditionalOperator(ConditionalOperator * e)2815 ACCResult VisitConditionalOperator(ConditionalOperator *e) {
2816 ACCResult left = Visit(e->getTrueExpr());
2817 if (left == ACC_invalid) return ACC_invalid;
2818 return merge(left, Visit(e->getFalseExpr()));
2819 }
2820
2821 /// Look through pseudo-objects.
VisitPseudoObjectExpr(PseudoObjectExpr * e)2822 ACCResult VisitPseudoObjectExpr(PseudoObjectExpr *e) {
2823 // If we're getting here, we should always have a result.
2824 return Visit(e->getResultExpr());
2825 }
2826
2827 /// Statement expressions are okay if their result expression is okay.
VisitStmtExpr(StmtExpr * e)2828 ACCResult VisitStmtExpr(StmtExpr *e) {
2829 return Visit(e->getSubStmt()->body_back());
2830 }
2831
2832 /// Some declaration references are okay.
VisitDeclRefExpr(DeclRefExpr * e)2833 ACCResult VisitDeclRefExpr(DeclRefExpr *e) {
2834 // References to global constants from system headers are okay.
2835 // These are things like 'kCFStringTransformToLatin'. They are
2836 // can also be assumed to be immune to retains.
2837 VarDecl *var = dyn_cast<VarDecl>(e->getDecl());
2838 if (isAnyRetainable(TargetClass) &&
2839 isAnyRetainable(SourceClass) &&
2840 var &&
2841 var->getStorageClass() == SC_Extern &&
2842 var->getType().isConstQualified() &&
2843 Context.getSourceManager().isInSystemHeader(var->getLocation())) {
2844 return ACC_bottom;
2845 }
2846
2847 // Nothing else.
2848 return ACC_invalid;
2849 }
2850
2851 /// Some calls are okay.
VisitCallExpr(CallExpr * e)2852 ACCResult VisitCallExpr(CallExpr *e) {
2853 if (FunctionDecl *fn = e->getDirectCallee())
2854 if (ACCResult result = checkCallToFunction(fn))
2855 return result;
2856
2857 return super::VisitCallExpr(e);
2858 }
2859
checkCallToFunction(FunctionDecl * fn)2860 ACCResult checkCallToFunction(FunctionDecl *fn) {
2861 // Require a CF*Ref return type.
2862 if (!isCFType(fn->getResultType()))
2863 return ACC_invalid;
2864
2865 if (!isAnyRetainable(TargetClass))
2866 return ACC_invalid;
2867
2868 // Honor an explicit 'not retained' attribute.
2869 if (fn->hasAttr<CFReturnsNotRetainedAttr>())
2870 return ACC_plusZero;
2871
2872 // Honor an explicit 'retained' attribute, except that for
2873 // now we're not going to permit implicit handling of +1 results,
2874 // because it's a bit frightening.
2875 if (fn->hasAttr<CFReturnsRetainedAttr>())
2876 return Diagnose ? ACC_plusOne
2877 : ACC_invalid; // ACC_plusOne if we start accepting this
2878
2879 // Recognize this specific builtin function, which is used by CFSTR.
2880 unsigned builtinID = fn->getBuiltinID();
2881 if (builtinID == Builtin::BI__builtin___CFStringMakeConstantString)
2882 return ACC_bottom;
2883
2884 // Otherwise, don't do anything implicit with an unaudited function.
2885 if (!fn->hasAttr<CFAuditedTransferAttr>())
2886 return ACC_invalid;
2887
2888 // Otherwise, it's +0 unless it follows the create convention.
2889 if (ento::coreFoundation::followsCreateRule(fn))
2890 return Diagnose ? ACC_plusOne
2891 : ACC_invalid; // ACC_plusOne if we start accepting this
2892
2893 return ACC_plusZero;
2894 }
2895
VisitObjCMessageExpr(ObjCMessageExpr * e)2896 ACCResult VisitObjCMessageExpr(ObjCMessageExpr *e) {
2897 return checkCallToMethod(e->getMethodDecl());
2898 }
2899
VisitObjCPropertyRefExpr(ObjCPropertyRefExpr * e)2900 ACCResult VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *e) {
2901 ObjCMethodDecl *method;
2902 if (e->isExplicitProperty())
2903 method = e->getExplicitProperty()->getGetterMethodDecl();
2904 else
2905 method = e->getImplicitPropertyGetter();
2906 return checkCallToMethod(method);
2907 }
2908
checkCallToMethod(ObjCMethodDecl * method)2909 ACCResult checkCallToMethod(ObjCMethodDecl *method) {
2910 if (!method) return ACC_invalid;
2911
2912 // Check for message sends to functions returning CF types. We
2913 // just obey the Cocoa conventions with these, even though the
2914 // return type is CF.
2915 if (!isAnyRetainable(TargetClass) || !isCFType(method->getResultType()))
2916 return ACC_invalid;
2917
2918 // If the method is explicitly marked not-retained, it's +0.
2919 if (method->hasAttr<CFReturnsNotRetainedAttr>())
2920 return ACC_plusZero;
2921
2922 // If the method is explicitly marked as returning retained, or its
2923 // selector follows a +1 Cocoa convention, treat it as +1.
2924 if (method->hasAttr<CFReturnsRetainedAttr>())
2925 return ACC_plusOne;
2926
2927 switch (method->getSelector().getMethodFamily()) {
2928 case OMF_alloc:
2929 case OMF_copy:
2930 case OMF_mutableCopy:
2931 case OMF_new:
2932 return ACC_plusOne;
2933
2934 default:
2935 // Otherwise, treat it as +0.
2936 return ACC_plusZero;
2937 }
2938 }
2939 };
2940 }
2941
isKnownName(StringRef name)2942 bool Sema::isKnownName(StringRef name) {
2943 if (name.empty())
2944 return false;
2945 LookupResult R(*this, &Context.Idents.get(name), SourceLocation(),
2946 Sema::LookupOrdinaryName);
2947 return LookupName(R, TUScope, false);
2948 }
2949
addFixitForObjCARCConversion(Sema & S,DiagnosticBuilder & DiagB,Sema::CheckedConversionKind CCK,SourceLocation afterLParen,QualType castType,Expr * castExpr,Expr * realCast,const char * bridgeKeyword,const char * CFBridgeName)2950 static void addFixitForObjCARCConversion(Sema &S,
2951 DiagnosticBuilder &DiagB,
2952 Sema::CheckedConversionKind CCK,
2953 SourceLocation afterLParen,
2954 QualType castType,
2955 Expr *castExpr,
2956 Expr *realCast,
2957 const char *bridgeKeyword,
2958 const char *CFBridgeName) {
2959 // We handle C-style and implicit casts here.
2960 switch (CCK) {
2961 case Sema::CCK_ImplicitConversion:
2962 case Sema::CCK_CStyleCast:
2963 case Sema::CCK_OtherCast:
2964 break;
2965 case Sema::CCK_FunctionalCast:
2966 return;
2967 }
2968
2969 if (CFBridgeName) {
2970 if (CCK == Sema::CCK_OtherCast) {
2971 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
2972 SourceRange range(NCE->getOperatorLoc(),
2973 NCE->getAngleBrackets().getEnd());
2974 SmallString<32> BridgeCall;
2975
2976 SourceManager &SM = S.getSourceManager();
2977 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
2978 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
2979 BridgeCall += ' ';
2980
2981 BridgeCall += CFBridgeName;
2982 DiagB.AddFixItHint(FixItHint::CreateReplacement(range, BridgeCall));
2983 }
2984 return;
2985 }
2986 Expr *castedE = castExpr;
2987 if (CStyleCastExpr *CCE = dyn_cast<CStyleCastExpr>(castedE))
2988 castedE = CCE->getSubExpr();
2989 castedE = castedE->IgnoreImpCasts();
2990 SourceRange range = castedE->getSourceRange();
2991
2992 SmallString<32> BridgeCall;
2993
2994 SourceManager &SM = S.getSourceManager();
2995 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1));
2996 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts()))
2997 BridgeCall += ' ';
2998
2999 BridgeCall += CFBridgeName;
3000
3001 if (isa<ParenExpr>(castedE)) {
3002 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3003 BridgeCall));
3004 } else {
3005 BridgeCall += '(';
3006 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3007 BridgeCall));
3008 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3009 S.PP.getLocForEndOfToken(range.getEnd()),
3010 ")"));
3011 }
3012 return;
3013 }
3014
3015 if (CCK == Sema::CCK_CStyleCast) {
3016 DiagB.AddFixItHint(FixItHint::CreateInsertion(afterLParen, bridgeKeyword));
3017 } else if (CCK == Sema::CCK_OtherCast) {
3018 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) {
3019 std::string castCode = "(";
3020 castCode += bridgeKeyword;
3021 castCode += castType.getAsString();
3022 castCode += ")";
3023 SourceRange Range(NCE->getOperatorLoc(),
3024 NCE->getAngleBrackets().getEnd());
3025 DiagB.AddFixItHint(FixItHint::CreateReplacement(Range, castCode));
3026 }
3027 } else {
3028 std::string castCode = "(";
3029 castCode += bridgeKeyword;
3030 castCode += castType.getAsString();
3031 castCode += ")";
3032 Expr *castedE = castExpr->IgnoreImpCasts();
3033 SourceRange range = castedE->getSourceRange();
3034 if (isa<ParenExpr>(castedE)) {
3035 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3036 castCode));
3037 } else {
3038 castCode += "(";
3039 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(),
3040 castCode));
3041 DiagB.AddFixItHint(FixItHint::CreateInsertion(
3042 S.PP.getLocForEndOfToken(range.getEnd()),
3043 ")"));
3044 }
3045 }
3046 }
3047
3048 static void
diagnoseObjCARCConversion(Sema & S,SourceRange castRange,QualType castType,ARCConversionTypeClass castACTC,Expr * castExpr,Expr * realCast,ARCConversionTypeClass exprACTC,Sema::CheckedConversionKind CCK)3049 diagnoseObjCARCConversion(Sema &S, SourceRange castRange,
3050 QualType castType, ARCConversionTypeClass castACTC,
3051 Expr *castExpr, Expr *realCast,
3052 ARCConversionTypeClass exprACTC,
3053 Sema::CheckedConversionKind CCK) {
3054 SourceLocation loc =
3055 (castRange.isValid() ? castRange.getBegin() : castExpr->getExprLoc());
3056
3057 if (S.makeUnavailableInSystemHeader(loc,
3058 "converts between Objective-C and C pointers in -fobjc-arc"))
3059 return;
3060
3061 QualType castExprType = castExpr->getType();
3062
3063 unsigned srcKind = 0;
3064 switch (exprACTC) {
3065 case ACTC_none:
3066 case ACTC_coreFoundation:
3067 case ACTC_voidPtr:
3068 srcKind = (castExprType->isPointerType() ? 1 : 0);
3069 break;
3070 case ACTC_retainable:
3071 srcKind = (castExprType->isBlockPointerType() ? 2 : 3);
3072 break;
3073 case ACTC_indirectRetainable:
3074 srcKind = 4;
3075 break;
3076 }
3077
3078 // Check whether this could be fixed with a bridge cast.
3079 SourceLocation afterLParen = S.PP.getLocForEndOfToken(castRange.getBegin());
3080 SourceLocation noteLoc = afterLParen.isValid() ? afterLParen : loc;
3081
3082 // Bridge from an ARC type to a CF type.
3083 if (castACTC == ACTC_retainable && isAnyRetainable(exprACTC)) {
3084
3085 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3086 << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit
3087 << 2 // of C pointer type
3088 << castExprType
3089 << unsigned(castType->isBlockPointerType()) // to ObjC|block type
3090 << castType
3091 << castRange
3092 << castExpr->getSourceRange();
3093 bool br = S.isKnownName("CFBridgingRelease");
3094 ACCResult CreateRule =
3095 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3096 assert(CreateRule != ACC_bottom && "This cast should already be accepted.");
3097 if (CreateRule != ACC_plusOne)
3098 {
3099 DiagnosticBuilder DiagB =
3100 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3101 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3102
3103 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3104 castType, castExpr, realCast, "__bridge ", 0);
3105 }
3106 if (CreateRule != ACC_plusZero)
3107 {
3108 DiagnosticBuilder DiagB =
3109 (CCK == Sema::CCK_OtherCast && !br) ?
3110 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_transfer) << castExprType :
3111 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3112 diag::note_arc_bridge_transfer)
3113 << castExprType << br;
3114
3115 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3116 castType, castExpr, realCast, "__bridge_transfer ",
3117 br ? "CFBridgingRelease" : 0);
3118 }
3119
3120 return;
3121 }
3122
3123 // Bridge from a CF type to an ARC type.
3124 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC)) {
3125 bool br = S.isKnownName("CFBridgingRetain");
3126 S.Diag(loc, diag::err_arc_cast_requires_bridge)
3127 << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit
3128 << unsigned(castExprType->isBlockPointerType()) // of ObjC|block type
3129 << castExprType
3130 << 2 // to C pointer type
3131 << castType
3132 << castRange
3133 << castExpr->getSourceRange();
3134 ACCResult CreateRule =
3135 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr);
3136 assert(CreateRule != ACC_bottom && "This cast should already be accepted.");
3137 if (CreateRule != ACC_plusOne)
3138 {
3139 DiagnosticBuilder DiagB =
3140 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge)
3141 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge);
3142 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3143 castType, castExpr, realCast, "__bridge ", 0);
3144 }
3145 if (CreateRule != ACC_plusZero)
3146 {
3147 DiagnosticBuilder DiagB =
3148 (CCK == Sema::CCK_OtherCast && !br) ?
3149 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_retained) << castType :
3150 S.Diag(br ? castExpr->getExprLoc() : noteLoc,
3151 diag::note_arc_bridge_retained)
3152 << castType << br;
3153
3154 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen,
3155 castType, castExpr, realCast, "__bridge_retained ",
3156 br ? "CFBridgingRetain" : 0);
3157 }
3158
3159 return;
3160 }
3161
3162 S.Diag(loc, diag::err_arc_mismatched_cast)
3163 << (CCK != Sema::CCK_ImplicitConversion)
3164 << srcKind << castExprType << castType
3165 << castRange << castExpr->getSourceRange();
3166 }
3167
getObjCBridgeAttr(const TypedefType * TD)3168 static inline ObjCBridgeAttr *getObjCBridgeAttr(const TypedefType *TD) {
3169 TypedefNameDecl *TDNDecl = TD->getDecl();
3170 QualType QT = TDNDecl->getUnderlyingType();
3171 if (QT->isPointerType()) {
3172 QT = QT->getPointeeType();
3173 if (const RecordType *RT = QT->getAs<RecordType>())
3174 if (RecordDecl *RD = RT->getDecl())
3175 if (RD->hasAttr<ObjCBridgeAttr>())
3176 return RD->getAttr<ObjCBridgeAttr>();
3177 }
3178 return 0;
3179 }
3180
CheckObjCBridgeNSCast(Sema & S,QualType castType,Expr * castExpr)3181 static bool CheckObjCBridgeNSCast(Sema &S, QualType castType, Expr *castExpr) {
3182 QualType T = castExpr->getType();
3183 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3184 TypedefNameDecl *TDNDecl = TD->getDecl();
3185 if (ObjCBridgeAttr *ObjCBAttr = getObjCBridgeAttr(TD)) {
3186 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3187 NamedDecl *Target = 0;
3188 // Check for an existing type with this name.
3189 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3190 Sema::LookupOrdinaryName);
3191 if (S.LookupName(R, S.TUScope)) {
3192 Target = R.getFoundDecl();
3193 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3194 ObjCInterfaceDecl *ExprClass = cast<ObjCInterfaceDecl>(Target);
3195 if (const ObjCObjectPointerType *InterfacePointerType =
3196 castType->getAsObjCInterfacePointerType()) {
3197 ObjCInterfaceDecl *CastClass
3198 = InterfacePointerType->getObjectType()->getInterface();
3199 if ((CastClass == ExprClass) || (CastClass && ExprClass->isSuperClassOf(CastClass)))
3200 return true;
3201 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge)
3202 << T << Target->getName() << castType->getPointeeType();
3203 return true;
3204 } else {
3205 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge)
3206 << T << Target->getName() << castType;
3207 return true;
3208 }
3209 }
3210 }
3211 S.Diag(castExpr->getLocStart(), diag::err_objc_cf_bridged_not_interface)
3212 << castExpr->getType() << Parm->getName();
3213 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3214 if (Target)
3215 S.Diag(Target->getLocStart(), diag::note_declared_at);
3216 }
3217 return true;
3218 }
3219 T = TDNDecl->getUnderlyingType();
3220 }
3221 return false;
3222 }
3223
3224 // (CFErrorRef)ns
CheckObjCBridgeCFCast(Sema & S,QualType castType,Expr * castExpr)3225 static bool CheckObjCBridgeCFCast(Sema &S, QualType castType, Expr *castExpr) {
3226 QualType T = castType;
3227 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) {
3228 TypedefNameDecl *TDNDecl = TD->getDecl();
3229 if (ObjCBridgeAttr *ObjCBAttr = getObjCBridgeAttr(TD)) {
3230 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) {
3231 NamedDecl *Target = 0;
3232 // Check for an existing type with this name.
3233 LookupResult R(S, DeclarationName(Parm), SourceLocation(),
3234 Sema::LookupOrdinaryName);
3235 if (S.LookupName(R, S.TUScope)) {
3236 Target = R.getFoundDecl();
3237 if (Target && isa<ObjCInterfaceDecl>(Target)) {
3238 ObjCInterfaceDecl *CastClass = cast<ObjCInterfaceDecl>(Target);
3239 if (const ObjCObjectPointerType *InterfacePointerType =
3240 castExpr->getType()->getAsObjCInterfacePointerType()) {
3241 ObjCInterfaceDecl *ExprClass
3242 = InterfacePointerType->getObjectType()->getInterface();
3243 if ((CastClass == ExprClass) || (ExprClass && CastClass->isSuperClassOf(ExprClass)))
3244 return true;
3245 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge_to_cf)
3246 << castExpr->getType()->getPointeeType() << T;
3247 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3248 return true;
3249 } else {
3250 S.Diag(castExpr->getLocStart(), diag::warn_objc_invalid_bridge_to_cf)
3251 << castExpr->getType() << castType;
3252 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3253 return true;
3254 }
3255 }
3256 }
3257 S.Diag(castExpr->getLocStart(), diag::err_objc_ns_bridged_invalid_cfobject)
3258 << castExpr->getType() << castType;
3259 S.Diag(TDNDecl->getLocStart(), diag::note_declared_at);
3260 if (Target)
3261 S.Diag(Target->getLocStart(), diag::note_declared_at);
3262 }
3263 return true;
3264 }
3265 T = TDNDecl->getUnderlyingType();
3266 }
3267 return false;
3268 }
3269
3270 Sema::ARCConversionResult
CheckObjCARCConversion(SourceRange castRange,QualType castType,Expr * & castExpr,CheckedConversionKind CCK,bool DiagnoseCFAudited)3271 Sema::CheckObjCARCConversion(SourceRange castRange, QualType castType,
3272 Expr *&castExpr, CheckedConversionKind CCK,
3273 bool DiagnoseCFAudited) {
3274 QualType castExprType = castExpr->getType();
3275
3276 // For the purposes of the classification, we assume reference types
3277 // will bind to temporaries.
3278 QualType effCastType = castType;
3279 if (const ReferenceType *ref = castType->getAs<ReferenceType>())
3280 effCastType = ref->getPointeeType();
3281
3282 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExprType);
3283 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(effCastType);
3284 if (exprACTC == castACTC) {
3285 // check for viablity and report error if casting an rvalue to a
3286 // life-time qualifier.
3287 if ((castACTC == ACTC_retainable) &&
3288 (CCK == CCK_CStyleCast || CCK == CCK_OtherCast) &&
3289 (castType != castExprType)) {
3290 const Type *DT = castType.getTypePtr();
3291 QualType QDT = castType;
3292 // We desugar some types but not others. We ignore those
3293 // that cannot happen in a cast; i.e. auto, and those which
3294 // should not be de-sugared; i.e typedef.
3295 if (const ParenType *PT = dyn_cast<ParenType>(DT))
3296 QDT = PT->desugar();
3297 else if (const TypeOfType *TP = dyn_cast<TypeOfType>(DT))
3298 QDT = TP->desugar();
3299 else if (const AttributedType *AT = dyn_cast<AttributedType>(DT))
3300 QDT = AT->desugar();
3301 if (QDT != castType &&
3302 QDT.getObjCLifetime() != Qualifiers::OCL_None) {
3303 SourceLocation loc =
3304 (castRange.isValid() ? castRange.getBegin()
3305 : castExpr->getExprLoc());
3306 Diag(loc, diag::err_arc_nolifetime_behavior);
3307 }
3308 }
3309 return ACR_okay;
3310 }
3311
3312 if (isAnyCLike(exprACTC) && isAnyCLike(castACTC)) return ACR_okay;
3313
3314 // Allow all of these types to be cast to integer types (but not
3315 // vice-versa).
3316 if (castACTC == ACTC_none && castType->isIntegralType(Context))
3317 return ACR_okay;
3318
3319 // Allow casts between pointers to lifetime types (e.g., __strong id*)
3320 // and pointers to void (e.g., cv void *). Casting from void* to lifetime*
3321 // must be explicit.
3322 if (exprACTC == ACTC_indirectRetainable && castACTC == ACTC_voidPtr)
3323 return ACR_okay;
3324 if (castACTC == ACTC_indirectRetainable && exprACTC == ACTC_voidPtr &&
3325 CCK != CCK_ImplicitConversion)
3326 return ACR_okay;
3327
3328 if (castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation &&
3329 (CCK == CCK_CStyleCast || CCK == CCK_FunctionalCast))
3330 if (CheckObjCBridgeNSCast(*this, castType, castExpr))
3331 return ACR_okay;
3332
3333 if (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable &&
3334 (CCK == CCK_CStyleCast || CCK == CCK_FunctionalCast))
3335 if (CheckObjCBridgeCFCast(*this, castType, castExpr))
3336 return ACR_okay;
3337
3338
3339 switch (ARCCastChecker(Context, exprACTC, castACTC, false).Visit(castExpr)) {
3340 // For invalid casts, fall through.
3341 case ACC_invalid:
3342 break;
3343
3344 // Do nothing for both bottom and +0.
3345 case ACC_bottom:
3346 case ACC_plusZero:
3347 return ACR_okay;
3348
3349 // If the result is +1, consume it here.
3350 case ACC_plusOne:
3351 castExpr = ImplicitCastExpr::Create(Context, castExpr->getType(),
3352 CK_ARCConsumeObject, castExpr,
3353 0, VK_RValue);
3354 ExprNeedsCleanups = true;
3355 return ACR_okay;
3356 }
3357
3358 // If this is a non-implicit cast from id or block type to a
3359 // CoreFoundation type, delay complaining in case the cast is used
3360 // in an acceptable context.
3361 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC) &&
3362 CCK != CCK_ImplicitConversion)
3363 return ACR_unbridged;
3364
3365 // Do not issue "bridge cast" diagnostic when implicit casting
3366 // a retainable object to a CF type parameter belonging to an audited
3367 // CF API function. Let caller issue a normal type mismatched diagnostic
3368 // instead.
3369 if (!DiagnoseCFAudited || exprACTC != ACTC_retainable ||
3370 castACTC != ACTC_coreFoundation)
3371 diagnoseObjCARCConversion(*this, castRange, castType, castACTC,
3372 castExpr, castExpr, exprACTC, CCK);
3373 return ACR_okay;
3374 }
3375
3376 /// Given that we saw an expression with the ARCUnbridgedCastTy
3377 /// placeholder type, complain bitterly.
diagnoseARCUnbridgedCast(Expr * e)3378 void Sema::diagnoseARCUnbridgedCast(Expr *e) {
3379 // We expect the spurious ImplicitCastExpr to already have been stripped.
3380 assert(!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast));
3381 CastExpr *realCast = cast<CastExpr>(e->IgnoreParens());
3382
3383 SourceRange castRange;
3384 QualType castType;
3385 CheckedConversionKind CCK;
3386
3387 if (CStyleCastExpr *cast = dyn_cast<CStyleCastExpr>(realCast)) {
3388 castRange = SourceRange(cast->getLParenLoc(), cast->getRParenLoc());
3389 castType = cast->getTypeAsWritten();
3390 CCK = CCK_CStyleCast;
3391 } else if (ExplicitCastExpr *cast = dyn_cast<ExplicitCastExpr>(realCast)) {
3392 castRange = cast->getTypeInfoAsWritten()->getTypeLoc().getSourceRange();
3393 castType = cast->getTypeAsWritten();
3394 CCK = CCK_OtherCast;
3395 } else {
3396 castType = cast->getType();
3397 CCK = CCK_ImplicitConversion;
3398 }
3399
3400 ARCConversionTypeClass castACTC =
3401 classifyTypeForARCConversion(castType.getNonReferenceType());
3402
3403 Expr *castExpr = realCast->getSubExpr();
3404 assert(classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable);
3405
3406 diagnoseObjCARCConversion(*this, castRange, castType, castACTC,
3407 castExpr, realCast, ACTC_retainable, CCK);
3408 }
3409
3410 /// stripARCUnbridgedCast - Given an expression of ARCUnbridgedCast
3411 /// type, remove the placeholder cast.
stripARCUnbridgedCast(Expr * e)3412 Expr *Sema::stripARCUnbridgedCast(Expr *e) {
3413 assert(e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast));
3414
3415 if (ParenExpr *pe = dyn_cast<ParenExpr>(e)) {
3416 Expr *sub = stripARCUnbridgedCast(pe->getSubExpr());
3417 return new (Context) ParenExpr(pe->getLParen(), pe->getRParen(), sub);
3418 } else if (UnaryOperator *uo = dyn_cast<UnaryOperator>(e)) {
3419 assert(uo->getOpcode() == UO_Extension);
3420 Expr *sub = stripARCUnbridgedCast(uo->getSubExpr());
3421 return new (Context) UnaryOperator(sub, UO_Extension, sub->getType(),
3422 sub->getValueKind(), sub->getObjectKind(),
3423 uo->getOperatorLoc());
3424 } else if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) {
3425 assert(!gse->isResultDependent());
3426
3427 unsigned n = gse->getNumAssocs();
3428 SmallVector<Expr*, 4> subExprs(n);
3429 SmallVector<TypeSourceInfo*, 4> subTypes(n);
3430 for (unsigned i = 0; i != n; ++i) {
3431 subTypes[i] = gse->getAssocTypeSourceInfo(i);
3432 Expr *sub = gse->getAssocExpr(i);
3433 if (i == gse->getResultIndex())
3434 sub = stripARCUnbridgedCast(sub);
3435 subExprs[i] = sub;
3436 }
3437
3438 return new (Context) GenericSelectionExpr(Context, gse->getGenericLoc(),
3439 gse->getControllingExpr(),
3440 subTypes, subExprs,
3441 gse->getDefaultLoc(),
3442 gse->getRParenLoc(),
3443 gse->containsUnexpandedParameterPack(),
3444 gse->getResultIndex());
3445 } else {
3446 assert(isa<ImplicitCastExpr>(e) && "bad form of unbridged cast!");
3447 return cast<ImplicitCastExpr>(e)->getSubExpr();
3448 }
3449 }
3450
CheckObjCARCUnavailableWeakConversion(QualType castType,QualType exprType)3451 bool Sema::CheckObjCARCUnavailableWeakConversion(QualType castType,
3452 QualType exprType) {
3453 QualType canCastType =
3454 Context.getCanonicalType(castType).getUnqualifiedType();
3455 QualType canExprType =
3456 Context.getCanonicalType(exprType).getUnqualifiedType();
3457 if (isa<ObjCObjectPointerType>(canCastType) &&
3458 castType.getObjCLifetime() == Qualifiers::OCL_Weak &&
3459 canExprType->isObjCObjectPointerType()) {
3460 if (const ObjCObjectPointerType *ObjT =
3461 canExprType->getAs<ObjCObjectPointerType>())
3462 if (const ObjCInterfaceDecl *ObjI = ObjT->getInterfaceDecl())
3463 return !ObjI->isArcWeakrefUnavailable();
3464 }
3465 return true;
3466 }
3467
3468 /// Look for an ObjCReclaimReturnedObject cast and destroy it.
maybeUndoReclaimObject(Expr * e)3469 static Expr *maybeUndoReclaimObject(Expr *e) {
3470 // For now, we just undo operands that are *immediately* reclaim
3471 // expressions, which prevents the vast majority of potential
3472 // problems here. To catch them all, we'd need to rebuild arbitrary
3473 // value-propagating subexpressions --- we can't reliably rebuild
3474 // in-place because of expression sharing.
3475 if (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e))
3476 if (ice->getCastKind() == CK_ARCReclaimReturnedObject)
3477 return ice->getSubExpr();
3478
3479 return e;
3480 }
3481
BuildObjCBridgedCast(SourceLocation LParenLoc,ObjCBridgeCastKind Kind,SourceLocation BridgeKeywordLoc,TypeSourceInfo * TSInfo,Expr * SubExpr)3482 ExprResult Sema::BuildObjCBridgedCast(SourceLocation LParenLoc,
3483 ObjCBridgeCastKind Kind,
3484 SourceLocation BridgeKeywordLoc,
3485 TypeSourceInfo *TSInfo,
3486 Expr *SubExpr) {
3487 ExprResult SubResult = UsualUnaryConversions(SubExpr);
3488 if (SubResult.isInvalid()) return ExprError();
3489 SubExpr = SubResult.take();
3490
3491 QualType T = TSInfo->getType();
3492 QualType FromType = SubExpr->getType();
3493
3494 CastKind CK;
3495
3496 bool MustConsume = false;
3497 if (T->isDependentType() || SubExpr->isTypeDependent()) {
3498 // Okay: we'll build a dependent expression type.
3499 CK = CK_Dependent;
3500 } else if (T->isObjCARCBridgableType() && FromType->isCARCBridgableType()) {
3501 // Casting CF -> id
3502 CK = (T->isBlockPointerType() ? CK_AnyPointerToBlockPointerCast
3503 : CK_CPointerToObjCPointerCast);
3504 switch (Kind) {
3505 case OBC_Bridge:
3506 break;
3507
3508 case OBC_BridgeRetained: {
3509 bool br = isKnownName("CFBridgingRelease");
3510 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
3511 << 2
3512 << FromType
3513 << (T->isBlockPointerType()? 1 : 0)
3514 << T
3515 << SubExpr->getSourceRange()
3516 << Kind;
3517 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
3518 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge");
3519 Diag(BridgeKeywordLoc, diag::note_arc_bridge_transfer)
3520 << FromType << br
3521 << FixItHint::CreateReplacement(BridgeKeywordLoc,
3522 br ? "CFBridgingRelease "
3523 : "__bridge_transfer ");
3524
3525 Kind = OBC_Bridge;
3526 break;
3527 }
3528
3529 case OBC_BridgeTransfer:
3530 // We must consume the Objective-C object produced by the cast.
3531 MustConsume = true;
3532 break;
3533 }
3534 } else if (T->isCARCBridgableType() && FromType->isObjCARCBridgableType()) {
3535 // Okay: id -> CF
3536 CK = CK_BitCast;
3537 switch (Kind) {
3538 case OBC_Bridge:
3539 // Reclaiming a value that's going to be __bridge-casted to CF
3540 // is very dangerous, so we don't do it.
3541 SubExpr = maybeUndoReclaimObject(SubExpr);
3542 break;
3543
3544 case OBC_BridgeRetained:
3545 // Produce the object before casting it.
3546 SubExpr = ImplicitCastExpr::Create(Context, FromType,
3547 CK_ARCProduceObject,
3548 SubExpr, 0, VK_RValue);
3549 break;
3550
3551 case OBC_BridgeTransfer: {
3552 bool br = isKnownName("CFBridgingRetain");
3553 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind)
3554 << (FromType->isBlockPointerType()? 1 : 0)
3555 << FromType
3556 << 2
3557 << T
3558 << SubExpr->getSourceRange()
3559 << Kind;
3560
3561 Diag(BridgeKeywordLoc, diag::note_arc_bridge)
3562 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge ");
3563 Diag(BridgeKeywordLoc, diag::note_arc_bridge_retained)
3564 << T << br
3565 << FixItHint::CreateReplacement(BridgeKeywordLoc,
3566 br ? "CFBridgingRetain " : "__bridge_retained");
3567
3568 Kind = OBC_Bridge;
3569 break;
3570 }
3571 }
3572 } else {
3573 Diag(LParenLoc, diag::err_arc_bridge_cast_incompatible)
3574 << FromType << T << Kind
3575 << SubExpr->getSourceRange()
3576 << TSInfo->getTypeLoc().getSourceRange();
3577 return ExprError();
3578 }
3579
3580 Expr *Result = new (Context) ObjCBridgedCastExpr(LParenLoc, Kind, CK,
3581 BridgeKeywordLoc,
3582 TSInfo, SubExpr);
3583
3584 if (MustConsume) {
3585 ExprNeedsCleanups = true;
3586 Result = ImplicitCastExpr::Create(Context, T, CK_ARCConsumeObject, Result,
3587 0, VK_RValue);
3588 }
3589
3590 return Result;
3591 }
3592
ActOnObjCBridgedCast(Scope * S,SourceLocation LParenLoc,ObjCBridgeCastKind Kind,SourceLocation BridgeKeywordLoc,ParsedType Type,SourceLocation RParenLoc,Expr * SubExpr)3593 ExprResult Sema::ActOnObjCBridgedCast(Scope *S,
3594 SourceLocation LParenLoc,
3595 ObjCBridgeCastKind Kind,
3596 SourceLocation BridgeKeywordLoc,
3597 ParsedType Type,
3598 SourceLocation RParenLoc,
3599 Expr *SubExpr) {
3600 TypeSourceInfo *TSInfo = 0;
3601 QualType T = GetTypeFromParser(Type, &TSInfo);
3602 if (!TSInfo)
3603 TSInfo = Context.getTrivialTypeSourceInfo(T, LParenLoc);
3604 return BuildObjCBridgedCast(LParenLoc, Kind, BridgeKeywordLoc, TSInfo,
3605 SubExpr);
3606 }
3607