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