1//===--- SemaExprObjC.cpp - Semantic Analysis for ObjC Expressions --------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for Objective-C expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/ExprObjC.h" 18#include "clang/AST/StmtVisitor.h" 19#include "clang/AST/TypeLoc.h" 20#include "clang/Analysis/DomainSpecific/CocoaConventions.h" 21#include "clang/Edit/Commit.h" 22#include "clang/Edit/Rewriters.h" 23#include "clang/Lex/Preprocessor.h" 24#include "clang/Sema/Initialization.h" 25#include "clang/Sema/Lookup.h" 26#include "clang/Sema/Scope.h" 27#include "clang/Sema/ScopeInfo.h" 28#include "llvm/ADT/SmallString.h" 29 30using namespace clang; 31using namespace sema; 32using llvm::makeArrayRef; 33 34ExprResult 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 79ExprResult Sema::BuildObjCStringLiteral(SourceLocation AtLoc, StringLiteral *S){ 80 // Verify that this composite string is acceptable for ObjC strings. 81 if (CheckObjCString(S)) 82 return true; 83 84 // Initialize the constant string interface lazily. This assumes 85 // the NSString interface is seen in this translation unit. Note: We 86 // don't use NSConstantString, since the runtime team considers this 87 // interface private (even though it appears in the header files). 88 QualType Ty = Context.getObjCConstantStringInterface(); 89 if (!Ty.isNull()) { 90 Ty = Context.getObjCObjectPointerType(Ty); 91 } else if (getLangOpts().NoConstantCFStrings) { 92 IdentifierInfo *NSIdent=0; 93 std::string StringClass(getLangOpts().ObjCConstantStringClass); 94 95 if (StringClass.empty()) 96 NSIdent = &Context.Idents.get("NSConstantString"); 97 else 98 NSIdent = &Context.Idents.get(StringClass); 99 100 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc, 101 LookupOrdinaryName); 102 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) { 103 Context.setObjCConstantStringInterface(StrIF); 104 Ty = Context.getObjCConstantStringInterface(); 105 Ty = Context.getObjCObjectPointerType(Ty); 106 } else { 107 // If there is no NSConstantString interface defined then treat this 108 // as error and recover from it. 109 Diag(S->getLocStart(), diag::err_no_nsconstant_string_class) << NSIdent 110 << S->getSourceRange(); 111 Ty = Context.getObjCIdType(); 112 } 113 } else { 114 IdentifierInfo *NSIdent = NSAPIObj->getNSClassId(NSAPI::ClassId_NSString); 115 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc, 116 LookupOrdinaryName); 117 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) { 118 Context.setObjCConstantStringInterface(StrIF); 119 Ty = Context.getObjCConstantStringInterface(); 120 Ty = Context.getObjCObjectPointerType(Ty); 121 } else { 122 // If there is no NSString interface defined, implicitly declare 123 // a @class NSString; and use that instead. This is to make sure 124 // type of an NSString literal is represented correctly, instead of 125 // being an 'id' type. 126 Ty = Context.getObjCNSStringType(); 127 if (Ty.isNull()) { 128 ObjCInterfaceDecl *NSStringIDecl = 129 ObjCInterfaceDecl::Create (Context, 130 Context.getTranslationUnitDecl(), 131 SourceLocation(), NSIdent, 132 0, SourceLocation()); 133 Ty = Context.getObjCInterfaceType(NSStringIDecl); 134 Context.setObjCNSStringType(Ty); 135 } 136 Ty = Context.getObjCObjectPointerType(Ty); 137 } 138 } 139 140 return new (Context) ObjCStringLiteral(S, Ty, AtLoc); 141} 142 143/// \brief Emits an error if the given method does not exist, or if the return 144/// type is not an Objective-C object. 145static bool validateBoxingMethod(Sema &S, SourceLocation Loc, 146 const ObjCInterfaceDecl *Class, 147 Selector Sel, const ObjCMethodDecl *Method) { 148 if (!Method) { 149 // FIXME: Is there a better way to avoid quotes than using getName()? 150 S.Diag(Loc, diag::err_undeclared_boxing_method) << Sel << Class->getName(); 151 return false; 152 } 153 154 // Make sure the return type is reasonable. 155 QualType ReturnType = Method->getResultType(); 156 if (!ReturnType->isObjCObjectPointerType()) { 157 S.Diag(Loc, diag::err_objc_literal_method_sig) 158 << Sel; 159 S.Diag(Method->getLocation(), diag::note_objc_literal_method_return) 160 << ReturnType; 161 return false; 162 } 163 164 return true; 165} 166 167/// \brief Retrieve the NSNumber factory method that should be used to create 168/// an Objective-C literal for the given type. 169static ObjCMethodDecl *getNSNumberFactoryMethod(Sema &S, SourceLocation Loc, 170 QualType NumberType, 171 bool isLiteral = false, 172 SourceRange R = SourceRange()) { 173 Optional<NSAPI::NSNumberLiteralMethodKind> Kind = 174 S.NSAPIObj->getNSNumberFactoryMethodKind(NumberType); 175 176 if (!Kind) { 177 if (isLiteral) { 178 S.Diag(Loc, diag::err_invalid_nsnumber_type) 179 << NumberType << R; 180 } 181 return 0; 182 } 183 184 // If we already looked up this method, we're done. 185 if (S.NSNumberLiteralMethods[*Kind]) 186 return S.NSNumberLiteralMethods[*Kind]; 187 188 Selector Sel = S.NSAPIObj->getNSNumberLiteralSelector(*Kind, 189 /*Instance=*/false); 190 191 ASTContext &CX = S.Context; 192 193 // Look up the NSNumber class, if we haven't done so already. It's cached 194 // in the Sema instance. 195 if (!S.NSNumberDecl) { 196 IdentifierInfo *NSNumberId = 197 S.NSAPIObj->getNSClassId(NSAPI::ClassId_NSNumber); 198 NamedDecl *IF = S.LookupSingleName(S.TUScope, NSNumberId, 199 Loc, Sema::LookupOrdinaryName); 200 S.NSNumberDecl = dyn_cast_or_null<ObjCInterfaceDecl>(IF); 201 if (!S.NSNumberDecl) { 202 if (S.getLangOpts().DebuggerObjCLiteral) { 203 // Create a stub definition of NSNumber. 204 S.NSNumberDecl = ObjCInterfaceDecl::Create(CX, 205 CX.getTranslationUnitDecl(), 206 SourceLocation(), NSNumberId, 207 0, SourceLocation()); 208 } else { 209 // Otherwise, require a declaration of NSNumber. 210 S.Diag(Loc, diag::err_undeclared_nsnumber); 211 return 0; 212 } 213 } else if (!S.NSNumberDecl->hasDefinition()) { 214 S.Diag(Loc, diag::err_undeclared_nsnumber); 215 return 0; 216 } 217 218 // generate the pointer to NSNumber type. 219 QualType NSNumberObject = CX.getObjCInterfaceType(S.NSNumberDecl); 220 S.NSNumberPointer = CX.getObjCObjectPointerType(NSNumberObject); 221 } 222 223 // Look for the appropriate method within NSNumber. 224 ObjCMethodDecl *Method = S.NSNumberDecl->lookupClassMethod(Sel); 225 if (!Method && S.getLangOpts().DebuggerObjCLiteral) { 226 // create a stub definition this NSNumber factory method. 227 TypeSourceInfo *ResultTInfo = 0; 228 Method = ObjCMethodDecl::Create(CX, SourceLocation(), SourceLocation(), Sel, 229 S.NSNumberPointer, ResultTInfo, 230 S.NSNumberDecl, 231 /*isInstance=*/false, /*isVariadic=*/false, 232 /*isPropertyAccessor=*/false, 233 /*isImplicitlyDeclared=*/true, 234 /*isDefined=*/false, 235 ObjCMethodDecl::Required, 236 /*HasRelatedResultType=*/false); 237 ParmVarDecl *value = ParmVarDecl::Create(S.Context, Method, 238 SourceLocation(), SourceLocation(), 239 &CX.Idents.get("value"), 240 NumberType, /*TInfo=*/0, SC_None, 241 0); 242 Method->setMethodParams(S.Context, value, None); 243 } 244 245 if (!validateBoxingMethod(S, Loc, S.NSNumberDecl, Sel, Method)) 246 return 0; 247 248 // Note: if the parameter type is out-of-line, we'll catch it later in the 249 // implicit conversion. 250 251 S.NSNumberLiteralMethods[*Kind] = Method; 252 return Method; 253} 254 255/// BuildObjCNumericLiteral - builds an ObjCBoxedExpr AST node for the 256/// numeric literal expression. Type of the expression will be "NSNumber *". 257ExprResult Sema::BuildObjCNumericLiteral(SourceLocation AtLoc, Expr *Number) { 258 // Determine the type of the literal. 259 QualType NumberType = Number->getType(); 260 if (CharacterLiteral *Char = dyn_cast<CharacterLiteral>(Number)) { 261 // In C, character literals have type 'int'. That's not the type we want 262 // to use to determine the Objective-c literal kind. 263 switch (Char->getKind()) { 264 case CharacterLiteral::Ascii: 265 NumberType = Context.CharTy; 266 break; 267 268 case CharacterLiteral::Wide: 269 NumberType = Context.getWCharType(); 270 break; 271 272 case CharacterLiteral::UTF16: 273 NumberType = Context.Char16Ty; 274 break; 275 276 case CharacterLiteral::UTF32: 277 NumberType = Context.Char32Ty; 278 break; 279 } 280 } 281 282 // Look for the appropriate method within NSNumber. 283 // Construct the literal. 284 SourceRange NR(Number->getSourceRange()); 285 ObjCMethodDecl *Method = getNSNumberFactoryMethod(*this, AtLoc, NumberType, 286 true, NR); 287 if (!Method) 288 return ExprError(); 289 290 // Convert the number to the type that the parameter expects. 291 ParmVarDecl *ParamDecl = Method->param_begin()[0]; 292 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 293 ParamDecl); 294 ExprResult ConvertedNumber = PerformCopyInitialization(Entity, 295 SourceLocation(), 296 Owned(Number)); 297 if (ConvertedNumber.isInvalid()) 298 return ExprError(); 299 Number = ConvertedNumber.get(); 300 301 // Use the effective source range of the literal, including the leading '@'. 302 return MaybeBindToTemporary( 303 new (Context) ObjCBoxedExpr(Number, NSNumberPointer, Method, 304 SourceRange(AtLoc, NR.getEnd()))); 305} 306 307ExprResult Sema::ActOnObjCBoolLiteral(SourceLocation AtLoc, 308 SourceLocation ValueLoc, 309 bool Value) { 310 ExprResult Inner; 311 if (getLangOpts().CPlusPlus) { 312 Inner = ActOnCXXBoolLiteral(ValueLoc, Value? tok::kw_true : tok::kw_false); 313 } else { 314 // C doesn't actually have a way to represent literal values of type 315 // _Bool. So, we'll use 0/1 and implicit cast to _Bool. 316 Inner = ActOnIntegerConstant(ValueLoc, Value? 1 : 0); 317 Inner = ImpCastExprToType(Inner.get(), Context.BoolTy, 318 CK_IntegralToBoolean); 319 } 320 321 return BuildObjCNumericLiteral(AtLoc, Inner.get()); 322} 323 324/// \brief Check that the given expression is a valid element of an Objective-C 325/// collection literal. 326static ExprResult CheckObjCCollectionLiteralElement(Sema &S, Expr *Element, 327 QualType T) { 328 // If the expression is type-dependent, there's nothing for us to do. 329 if (Element->isTypeDependent()) 330 return Element; 331 332 ExprResult Result = S.CheckPlaceholderExpr(Element); 333 if (Result.isInvalid()) 334 return ExprError(); 335 Element = Result.get(); 336 337 // In C++, check for an implicit conversion to an Objective-C object pointer 338 // type. 339 if (S.getLangOpts().CPlusPlus && Element->getType()->isRecordType()) { 340 InitializedEntity Entity 341 = InitializedEntity::InitializeParameter(S.Context, T, 342 /*Consumed=*/false); 343 InitializationKind Kind 344 = InitializationKind::CreateCopy(Element->getLocStart(), 345 SourceLocation()); 346 InitializationSequence Seq(S, Entity, Kind, Element); 347 if (!Seq.Failed()) 348 return Seq.Perform(S, Entity, Kind, Element); 349 } 350 351 Expr *OrigElement = Element; 352 353 // Perform lvalue-to-rvalue conversion. 354 Result = S.DefaultLvalueConversion(Element); 355 if (Result.isInvalid()) 356 return ExprError(); 357 Element = Result.get(); 358 359 // Make sure that we have an Objective-C pointer type or block. 360 if (!Element->getType()->isObjCObjectPointerType() && 361 !Element->getType()->isBlockPointerType()) { 362 bool Recovered = false; 363 364 // If this is potentially an Objective-C numeric literal, add the '@'. 365 if (isa<IntegerLiteral>(OrigElement) || 366 isa<CharacterLiteral>(OrigElement) || 367 isa<FloatingLiteral>(OrigElement) || 368 isa<ObjCBoolLiteralExpr>(OrigElement) || 369 isa<CXXBoolLiteralExpr>(OrigElement)) { 370 if (S.NSAPIObj->getNSNumberFactoryMethodKind(OrigElement->getType())) { 371 int Which = isa<CharacterLiteral>(OrigElement) ? 1 372 : (isa<CXXBoolLiteralExpr>(OrigElement) || 373 isa<ObjCBoolLiteralExpr>(OrigElement)) ? 2 374 : 3; 375 376 S.Diag(OrigElement->getLocStart(), diag::err_box_literal_collection) 377 << Which << OrigElement->getSourceRange() 378 << FixItHint::CreateInsertion(OrigElement->getLocStart(), "@"); 379 380 Result = S.BuildObjCNumericLiteral(OrigElement->getLocStart(), 381 OrigElement); 382 if (Result.isInvalid()) 383 return ExprError(); 384 385 Element = Result.get(); 386 Recovered = true; 387 } 388 } 389 // If this is potentially an Objective-C string literal, add the '@'. 390 else if (StringLiteral *String = dyn_cast<StringLiteral>(OrigElement)) { 391 if (String->isAscii()) { 392 S.Diag(OrigElement->getLocStart(), diag::err_box_literal_collection) 393 << 0 << OrigElement->getSourceRange() 394 << FixItHint::CreateInsertion(OrigElement->getLocStart(), "@"); 395 396 Result = S.BuildObjCStringLiteral(OrigElement->getLocStart(), String); 397 if (Result.isInvalid()) 398 return ExprError(); 399 400 Element = Result.get(); 401 Recovered = true; 402 } 403 } 404 405 if (!Recovered) { 406 S.Diag(Element->getLocStart(), diag::err_invalid_collection_element) 407 << Element->getType(); 408 return ExprError(); 409 } 410 } 411 412 // Make sure that the element has the type that the container factory 413 // function expects. 414 return S.PerformCopyInitialization( 415 InitializedEntity::InitializeParameter(S.Context, T, 416 /*Consumed=*/false), 417 Element->getLocStart(), Element); 418} 419 420ExprResult Sema::BuildObjCBoxedExpr(SourceRange SR, Expr *ValueExpr) { 421 if (ValueExpr->isTypeDependent()) { 422 ObjCBoxedExpr *BoxedExpr = 423 new (Context) ObjCBoxedExpr(ValueExpr, Context.DependentTy, NULL, SR); 424 return Owned(BoxedExpr); 425 } 426 ObjCMethodDecl *BoxingMethod = NULL; 427 QualType BoxedType; 428 // Convert the expression to an RValue, so we can check for pointer types... 429 ExprResult RValue = DefaultFunctionArrayLvalueConversion(ValueExpr); 430 if (RValue.isInvalid()) { 431 return ExprError(); 432 } 433 ValueExpr = RValue.get(); 434 QualType ValueType(ValueExpr->getType()); 435 if (const PointerType *PT = ValueType->getAs<PointerType>()) { 436 QualType PointeeType = PT->getPointeeType(); 437 if (Context.hasSameUnqualifiedType(PointeeType, Context.CharTy)) { 438 439 if (!NSStringDecl) { 440 IdentifierInfo *NSStringId = 441 NSAPIObj->getNSClassId(NSAPI::ClassId_NSString); 442 NamedDecl *Decl = LookupSingleName(TUScope, NSStringId, 443 SR.getBegin(), LookupOrdinaryName); 444 NSStringDecl = dyn_cast_or_null<ObjCInterfaceDecl>(Decl); 445 if (!NSStringDecl) { 446 if (getLangOpts().DebuggerObjCLiteral) { 447 // Support boxed expressions in the debugger w/o NSString declaration. 448 DeclContext *TU = Context.getTranslationUnitDecl(); 449 NSStringDecl = ObjCInterfaceDecl::Create(Context, TU, 450 SourceLocation(), 451 NSStringId, 452 0, SourceLocation()); 453 } else { 454 Diag(SR.getBegin(), diag::err_undeclared_nsstring); 455 return ExprError(); 456 } 457 } else if (!NSStringDecl->hasDefinition()) { 458 Diag(SR.getBegin(), diag::err_undeclared_nsstring); 459 return ExprError(); 460 } 461 assert(NSStringDecl && "NSStringDecl should not be NULL"); 462 QualType NSStringObject = Context.getObjCInterfaceType(NSStringDecl); 463 NSStringPointer = Context.getObjCObjectPointerType(NSStringObject); 464 } 465 466 if (!StringWithUTF8StringMethod) { 467 IdentifierInfo *II = &Context.Idents.get("stringWithUTF8String"); 468 Selector stringWithUTF8String = Context.Selectors.getUnarySelector(II); 469 470 // Look for the appropriate method within NSString. 471 BoxingMethod = NSStringDecl->lookupClassMethod(stringWithUTF8String); 472 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) { 473 // Debugger needs to work even if NSString hasn't been defined. 474 TypeSourceInfo *ResultTInfo = 0; 475 ObjCMethodDecl *M = 476 ObjCMethodDecl::Create(Context, SourceLocation(), SourceLocation(), 477 stringWithUTF8String, NSStringPointer, 478 ResultTInfo, NSStringDecl, 479 /*isInstance=*/false, /*isVariadic=*/false, 480 /*isPropertyAccessor=*/false, 481 /*isImplicitlyDeclared=*/true, 482 /*isDefined=*/false, 483 ObjCMethodDecl::Required, 484 /*HasRelatedResultType=*/false); 485 QualType ConstCharType = Context.CharTy.withConst(); 486 ParmVarDecl *value = 487 ParmVarDecl::Create(Context, M, 488 SourceLocation(), SourceLocation(), 489 &Context.Idents.get("value"), 490 Context.getPointerType(ConstCharType), 491 /*TInfo=*/0, 492 SC_None, 0); 493 M->setMethodParams(Context, value, None); 494 BoxingMethod = M; 495 } 496 497 if (!validateBoxingMethod(*this, SR.getBegin(), NSStringDecl, 498 stringWithUTF8String, BoxingMethod)) 499 return ExprError(); 500 501 StringWithUTF8StringMethod = BoxingMethod; 502 } 503 504 BoxingMethod = StringWithUTF8StringMethod; 505 BoxedType = NSStringPointer; 506 } 507 } else if (ValueType->isBuiltinType()) { 508 // The other types we support are numeric, char and BOOL/bool. We could also 509 // provide limited support for structure types, such as NSRange, NSRect, and 510 // NSSize. See NSValue (NSValueGeometryExtensions) in <Foundation/NSGeometry.h> 511 // for more details. 512 513 // Check for a top-level character literal. 514 if (const CharacterLiteral *Char = 515 dyn_cast<CharacterLiteral>(ValueExpr->IgnoreParens())) { 516 // In C, character literals have type 'int'. That's not the type we want 517 // to use to determine the Objective-c literal kind. 518 switch (Char->getKind()) { 519 case CharacterLiteral::Ascii: 520 ValueType = Context.CharTy; 521 break; 522 523 case CharacterLiteral::Wide: 524 ValueType = Context.getWCharType(); 525 break; 526 527 case CharacterLiteral::UTF16: 528 ValueType = Context.Char16Ty; 529 break; 530 531 case CharacterLiteral::UTF32: 532 ValueType = Context.Char32Ty; 533 break; 534 } 535 } 536 537 // FIXME: Do I need to do anything special with BoolTy expressions? 538 539 // Look for the appropriate method within NSNumber. 540 BoxingMethod = getNSNumberFactoryMethod(*this, SR.getBegin(), ValueType); 541 BoxedType = NSNumberPointer; 542 543 } else if (const EnumType *ET = ValueType->getAs<EnumType>()) { 544 if (!ET->getDecl()->isComplete()) { 545 Diag(SR.getBegin(), diag::err_objc_incomplete_boxed_expression_type) 546 << ValueType << ValueExpr->getSourceRange(); 547 return ExprError(); 548 } 549 550 BoxingMethod = getNSNumberFactoryMethod(*this, SR.getBegin(), 551 ET->getDecl()->getIntegerType()); 552 BoxedType = NSNumberPointer; 553 } 554 555 if (!BoxingMethod) { 556 Diag(SR.getBegin(), diag::err_objc_illegal_boxed_expression_type) 557 << ValueType << ValueExpr->getSourceRange(); 558 return ExprError(); 559 } 560 561 // Convert the expression to the type that the parameter requires. 562 ParmVarDecl *ParamDecl = BoxingMethod->param_begin()[0]; 563 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 564 ParamDecl); 565 ExprResult ConvertedValueExpr = PerformCopyInitialization(Entity, 566 SourceLocation(), 567 Owned(ValueExpr)); 568 if (ConvertedValueExpr.isInvalid()) 569 return ExprError(); 570 ValueExpr = ConvertedValueExpr.get(); 571 572 ObjCBoxedExpr *BoxedExpr = 573 new (Context) ObjCBoxedExpr(ValueExpr, BoxedType, 574 BoxingMethod, SR); 575 return MaybeBindToTemporary(BoxedExpr); 576} 577 578/// Build an ObjC subscript pseudo-object expression, given that 579/// that's supported by the runtime. 580ExprResult Sema::BuildObjCSubscriptExpression(SourceLocation RB, Expr *BaseExpr, 581 Expr *IndexExpr, 582 ObjCMethodDecl *getterMethod, 583 ObjCMethodDecl *setterMethod) { 584 assert(!LangOpts.ObjCRuntime.isSubscriptPointerArithmetic()); 585 586 // We can't get dependent types here; our callers should have 587 // filtered them out. 588 assert((!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) && 589 "base or index cannot have dependent type here"); 590 591 // Filter out placeholders in the index. In theory, overloads could 592 // be preserved here, although that might not actually work correctly. 593 ExprResult Result = CheckPlaceholderExpr(IndexExpr); 594 if (Result.isInvalid()) 595 return ExprError(); 596 IndexExpr = Result.get(); 597 598 // Perform lvalue-to-rvalue conversion on the base. 599 Result = DefaultLvalueConversion(BaseExpr); 600 if (Result.isInvalid()) 601 return ExprError(); 602 BaseExpr = Result.get(); 603 604 // Build the pseudo-object expression. 605 return Owned(ObjCSubscriptRefExpr::Create(Context, 606 BaseExpr, 607 IndexExpr, 608 Context.PseudoObjectTy, 609 getterMethod, 610 setterMethod, RB)); 611 612} 613 614ExprResult Sema::BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements) { 615 // Look up the NSArray class, if we haven't done so already. 616 if (!NSArrayDecl) { 617 NamedDecl *IF = LookupSingleName(TUScope, 618 NSAPIObj->getNSClassId(NSAPI::ClassId_NSArray), 619 SR.getBegin(), 620 LookupOrdinaryName); 621 NSArrayDecl = dyn_cast_or_null<ObjCInterfaceDecl>(IF); 622 if (!NSArrayDecl && getLangOpts().DebuggerObjCLiteral) 623 NSArrayDecl = ObjCInterfaceDecl::Create (Context, 624 Context.getTranslationUnitDecl(), 625 SourceLocation(), 626 NSAPIObj->getNSClassId(NSAPI::ClassId_NSArray), 627 0, SourceLocation()); 628 629 if (!NSArrayDecl) { 630 Diag(SR.getBegin(), diag::err_undeclared_nsarray); 631 return ExprError(); 632 } 633 } 634 635 // Find the arrayWithObjects:count: method, if we haven't done so already. 636 QualType IdT = Context.getObjCIdType(); 637 if (!ArrayWithObjectsMethod) { 638 Selector 639 Sel = NSAPIObj->getNSArraySelector(NSAPI::NSArr_arrayWithObjectsCount); 640 ObjCMethodDecl *Method = NSArrayDecl->lookupClassMethod(Sel); 641 if (!Method && getLangOpts().DebuggerObjCLiteral) { 642 TypeSourceInfo *ResultTInfo = 0; 643 Method = ObjCMethodDecl::Create(Context, 644 SourceLocation(), SourceLocation(), Sel, 645 IdT, 646 ResultTInfo, 647 Context.getTranslationUnitDecl(), 648 false /*Instance*/, false/*isVariadic*/, 649 /*isPropertyAccessor=*/false, 650 /*isImplicitlyDeclared=*/true, /*isDefined=*/false, 651 ObjCMethodDecl::Required, 652 false); 653 SmallVector<ParmVarDecl *, 2> Params; 654 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method, 655 SourceLocation(), 656 SourceLocation(), 657 &Context.Idents.get("objects"), 658 Context.getPointerType(IdT), 659 /*TInfo=*/0, SC_None, 0); 660 Params.push_back(objects); 661 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method, 662 SourceLocation(), 663 SourceLocation(), 664 &Context.Idents.get("cnt"), 665 Context.UnsignedLongTy, 666 /*TInfo=*/0, SC_None, 0); 667 Params.push_back(cnt); 668 Method->setMethodParams(Context, Params, None); 669 } 670 671 if (!validateBoxingMethod(*this, SR.getBegin(), NSArrayDecl, Sel, Method)) 672 return ExprError(); 673 674 // Dig out the type that all elements should be converted to. 675 QualType T = Method->param_begin()[0]->getType(); 676 const PointerType *PtrT = T->getAs<PointerType>(); 677 if (!PtrT || 678 !Context.hasSameUnqualifiedType(PtrT->getPointeeType(), IdT)) { 679 Diag(SR.getBegin(), diag::err_objc_literal_method_sig) 680 << Sel; 681 Diag(Method->param_begin()[0]->getLocation(), 682 diag::note_objc_literal_method_param) 683 << 0 << T 684 << Context.getPointerType(IdT.withConst()); 685 return ExprError(); 686 } 687 688 // Check that the 'count' parameter is integral. 689 if (!Method->param_begin()[1]->getType()->isIntegerType()) { 690 Diag(SR.getBegin(), diag::err_objc_literal_method_sig) 691 << Sel; 692 Diag(Method->param_begin()[1]->getLocation(), 693 diag::note_objc_literal_method_param) 694 << 1 695 << Method->param_begin()[1]->getType() 696 << "integral"; 697 return ExprError(); 698 } 699 700 // We've found a good +arrayWithObjects:count: method. Save it! 701 ArrayWithObjectsMethod = Method; 702 } 703 704 QualType ObjectsType = ArrayWithObjectsMethod->param_begin()[0]->getType(); 705 QualType RequiredType = ObjectsType->castAs<PointerType>()->getPointeeType(); 706 707 // Check that each of the elements provided is valid in a collection literal, 708 // performing conversions as necessary. 709 Expr **ElementsBuffer = Elements.data(); 710 for (unsigned I = 0, N = Elements.size(); I != N; ++I) { 711 ExprResult Converted = CheckObjCCollectionLiteralElement(*this, 712 ElementsBuffer[I], 713 RequiredType); 714 if (Converted.isInvalid()) 715 return ExprError(); 716 717 ElementsBuffer[I] = Converted.get(); 718 } 719 720 QualType Ty 721 = Context.getObjCObjectPointerType( 722 Context.getObjCInterfaceType(NSArrayDecl)); 723 724 return MaybeBindToTemporary( 725 ObjCArrayLiteral::Create(Context, Elements, Ty, 726 ArrayWithObjectsMethod, SR)); 727} 728 729ExprResult Sema::BuildObjCDictionaryLiteral(SourceRange SR, 730 ObjCDictionaryElement *Elements, 731 unsigned NumElements) { 732 // Look up the NSDictionary class, if we haven't done so already. 733 if (!NSDictionaryDecl) { 734 NamedDecl *IF = LookupSingleName(TUScope, 735 NSAPIObj->getNSClassId(NSAPI::ClassId_NSDictionary), 736 SR.getBegin(), LookupOrdinaryName); 737 NSDictionaryDecl = dyn_cast_or_null<ObjCInterfaceDecl>(IF); 738 if (!NSDictionaryDecl && getLangOpts().DebuggerObjCLiteral) 739 NSDictionaryDecl = ObjCInterfaceDecl::Create (Context, 740 Context.getTranslationUnitDecl(), 741 SourceLocation(), 742 NSAPIObj->getNSClassId(NSAPI::ClassId_NSDictionary), 743 0, SourceLocation()); 744 745 if (!NSDictionaryDecl) { 746 Diag(SR.getBegin(), diag::err_undeclared_nsdictionary); 747 return ExprError(); 748 } 749 } 750 751 // Find the dictionaryWithObjects:forKeys:count: method, if we haven't done 752 // so already. 753 QualType IdT = Context.getObjCIdType(); 754 if (!DictionaryWithObjectsMethod) { 755 Selector Sel = NSAPIObj->getNSDictionarySelector( 756 NSAPI::NSDict_dictionaryWithObjectsForKeysCount); 757 ObjCMethodDecl *Method = NSDictionaryDecl->lookupClassMethod(Sel); 758 if (!Method && getLangOpts().DebuggerObjCLiteral) { 759 Method = ObjCMethodDecl::Create(Context, 760 SourceLocation(), SourceLocation(), Sel, 761 IdT, 762 0 /*TypeSourceInfo */, 763 Context.getTranslationUnitDecl(), 764 false /*Instance*/, false/*isVariadic*/, 765 /*isPropertyAccessor=*/false, 766 /*isImplicitlyDeclared=*/true, /*isDefined=*/false, 767 ObjCMethodDecl::Required, 768 false); 769 SmallVector<ParmVarDecl *, 3> Params; 770 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method, 771 SourceLocation(), 772 SourceLocation(), 773 &Context.Idents.get("objects"), 774 Context.getPointerType(IdT), 775 /*TInfo=*/0, SC_None, 0); 776 Params.push_back(objects); 777 ParmVarDecl *keys = ParmVarDecl::Create(Context, Method, 778 SourceLocation(), 779 SourceLocation(), 780 &Context.Idents.get("keys"), 781 Context.getPointerType(IdT), 782 /*TInfo=*/0, SC_None, 0); 783 Params.push_back(keys); 784 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method, 785 SourceLocation(), 786 SourceLocation(), 787 &Context.Idents.get("cnt"), 788 Context.UnsignedLongTy, 789 /*TInfo=*/0, SC_None, 0); 790 Params.push_back(cnt); 791 Method->setMethodParams(Context, Params, None); 792 } 793 794 if (!validateBoxingMethod(*this, SR.getBegin(), NSDictionaryDecl, Sel, 795 Method)) 796 return ExprError(); 797 798 // Dig out the type that all values should be converted to. 799 QualType ValueT = Method->param_begin()[0]->getType(); 800 const PointerType *PtrValue = ValueT->getAs<PointerType>(); 801 if (!PtrValue || 802 !Context.hasSameUnqualifiedType(PtrValue->getPointeeType(), IdT)) { 803 Diag(SR.getBegin(), diag::err_objc_literal_method_sig) 804 << Sel; 805 Diag(Method->param_begin()[0]->getLocation(), 806 diag::note_objc_literal_method_param) 807 << 0 << ValueT 808 << Context.getPointerType(IdT.withConst()); 809 return ExprError(); 810 } 811 812 // Dig out the type that all keys should be converted to. 813 QualType KeyT = Method->param_begin()[1]->getType(); 814 const PointerType *PtrKey = KeyT->getAs<PointerType>(); 815 if (!PtrKey || 816 !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(), 817 IdT)) { 818 bool err = true; 819 if (PtrKey) { 820 if (QIDNSCopying.isNull()) { 821 // key argument of selector is id<NSCopying>? 822 if (ObjCProtocolDecl *NSCopyingPDecl = 823 LookupProtocol(&Context.Idents.get("NSCopying"), SR.getBegin())) { 824 ObjCProtocolDecl *PQ[] = {NSCopyingPDecl}; 825 QIDNSCopying = 826 Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 827 (ObjCProtocolDecl**) PQ,1); 828 QIDNSCopying = Context.getObjCObjectPointerType(QIDNSCopying); 829 } 830 } 831 if (!QIDNSCopying.isNull()) 832 err = !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(), 833 QIDNSCopying); 834 } 835 836 if (err) { 837 Diag(SR.getBegin(), diag::err_objc_literal_method_sig) 838 << Sel; 839 Diag(Method->param_begin()[1]->getLocation(), 840 diag::note_objc_literal_method_param) 841 << 1 << KeyT 842 << Context.getPointerType(IdT.withConst()); 843 return ExprError(); 844 } 845 } 846 847 // Check that the 'count' parameter is integral. 848 QualType CountType = Method->param_begin()[2]->getType(); 849 if (!CountType->isIntegerType()) { 850 Diag(SR.getBegin(), diag::err_objc_literal_method_sig) 851 << Sel; 852 Diag(Method->param_begin()[2]->getLocation(), 853 diag::note_objc_literal_method_param) 854 << 2 << CountType 855 << "integral"; 856 return ExprError(); 857 } 858 859 // We've found a good +dictionaryWithObjects:keys:count: method; save it! 860 DictionaryWithObjectsMethod = Method; 861 } 862 863 QualType ValuesT = DictionaryWithObjectsMethod->param_begin()[0]->getType(); 864 QualType ValueT = ValuesT->castAs<PointerType>()->getPointeeType(); 865 QualType KeysT = DictionaryWithObjectsMethod->param_begin()[1]->getType(); 866 QualType KeyT = KeysT->castAs<PointerType>()->getPointeeType(); 867 868 // Check that each of the keys and values provided is valid in a collection 869 // literal, performing conversions as necessary. 870 bool HasPackExpansions = false; 871 for (unsigned I = 0, N = NumElements; I != N; ++I) { 872 // Check the key. 873 ExprResult Key = CheckObjCCollectionLiteralElement(*this, Elements[I].Key, 874 KeyT); 875 if (Key.isInvalid()) 876 return ExprError(); 877 878 // Check the value. 879 ExprResult Value 880 = CheckObjCCollectionLiteralElement(*this, Elements[I].Value, ValueT); 881 if (Value.isInvalid()) 882 return ExprError(); 883 884 Elements[I].Key = Key.get(); 885 Elements[I].Value = Value.get(); 886 887 if (Elements[I].EllipsisLoc.isInvalid()) 888 continue; 889 890 if (!Elements[I].Key->containsUnexpandedParameterPack() && 891 !Elements[I].Value->containsUnexpandedParameterPack()) { 892 Diag(Elements[I].EllipsisLoc, 893 diag::err_pack_expansion_without_parameter_packs) 894 << SourceRange(Elements[I].Key->getLocStart(), 895 Elements[I].Value->getLocEnd()); 896 return ExprError(); 897 } 898 899 HasPackExpansions = true; 900 } 901 902 903 QualType Ty 904 = Context.getObjCObjectPointerType( 905 Context.getObjCInterfaceType(NSDictionaryDecl)); 906 return MaybeBindToTemporary( 907 ObjCDictionaryLiteral::Create(Context, 908 llvm::makeArrayRef(Elements, 909 NumElements), 910 HasPackExpansions, 911 Ty, 912 DictionaryWithObjectsMethod, SR)); 913} 914 915ExprResult Sema::BuildObjCEncodeExpression(SourceLocation AtLoc, 916 TypeSourceInfo *EncodedTypeInfo, 917 SourceLocation RParenLoc) { 918 QualType EncodedType = EncodedTypeInfo->getType(); 919 QualType StrTy; 920 if (EncodedType->isDependentType()) 921 StrTy = Context.DependentTy; 922 else { 923 if (!EncodedType->getAsArrayTypeUnsafe() && //// Incomplete array is handled. 924 !EncodedType->isVoidType()) // void is handled too. 925 if (RequireCompleteType(AtLoc, EncodedType, 926 diag::err_incomplete_type_objc_at_encode, 927 EncodedTypeInfo->getTypeLoc())) 928 return ExprError(); 929 930 std::string Str; 931 Context.getObjCEncodingForType(EncodedType, Str); 932 933 // The type of @encode is the same as the type of the corresponding string, 934 // which is an array type. 935 StrTy = Context.CharTy; 936 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 937 if (getLangOpts().CPlusPlus || getLangOpts().ConstStrings) 938 StrTy.addConst(); 939 StrTy = Context.getConstantArrayType(StrTy, llvm::APInt(32, Str.size()+1), 940 ArrayType::Normal, 0); 941 } 942 943 return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc); 944} 945 946ExprResult Sema::ParseObjCEncodeExpression(SourceLocation AtLoc, 947 SourceLocation EncodeLoc, 948 SourceLocation LParenLoc, 949 ParsedType ty, 950 SourceLocation RParenLoc) { 951 // FIXME: Preserve type source info ? 952 TypeSourceInfo *TInfo; 953 QualType EncodedType = GetTypeFromParser(ty, &TInfo); 954 if (!TInfo) 955 TInfo = Context.getTrivialTypeSourceInfo(EncodedType, 956 PP.getLocForEndOfToken(LParenLoc)); 957 958 return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc); 959} 960 961ExprResult Sema::ParseObjCSelectorExpression(Selector Sel, 962 SourceLocation AtLoc, 963 SourceLocation SelLoc, 964 SourceLocation LParenLoc, 965 SourceLocation RParenLoc) { 966 ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel, 967 SourceRange(LParenLoc, RParenLoc), false, false); 968 if (!Method) 969 Method = LookupFactoryMethodInGlobalPool(Sel, 970 SourceRange(LParenLoc, RParenLoc)); 971 if (!Method) 972 Diag(SelLoc, diag::warn_undeclared_selector) << Sel; 973 974 if (!Method || 975 Method->getImplementationControl() != ObjCMethodDecl::Optional) { 976 llvm::DenseMap<Selector, SourceLocation>::iterator Pos 977 = ReferencedSelectors.find(Sel); 978 if (Pos == ReferencedSelectors.end()) 979 ReferencedSelectors.insert(std::make_pair(Sel, AtLoc)); 980 } 981 982 // In ARC, forbid the user from using @selector for 983 // retain/release/autorelease/dealloc/retainCount. 984 if (getLangOpts().ObjCAutoRefCount) { 985 switch (Sel.getMethodFamily()) { 986 case OMF_retain: 987 case OMF_release: 988 case OMF_autorelease: 989 case OMF_retainCount: 990 case OMF_dealloc: 991 Diag(AtLoc, diag::err_arc_illegal_selector) << 992 Sel << SourceRange(LParenLoc, RParenLoc); 993 break; 994 995 case OMF_None: 996 case OMF_alloc: 997 case OMF_copy: 998 case OMF_finalize: 999 case OMF_init: 1000 case OMF_mutableCopy: 1001 case OMF_new: 1002 case OMF_self: 1003 case OMF_performSelector: 1004 break; 1005 } 1006 } 1007 QualType Ty = Context.getObjCSelType(); 1008 return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc); 1009} 1010 1011ExprResult Sema::ParseObjCProtocolExpression(IdentifierInfo *ProtocolId, 1012 SourceLocation AtLoc, 1013 SourceLocation ProtoLoc, 1014 SourceLocation LParenLoc, 1015 SourceLocation ProtoIdLoc, 1016 SourceLocation RParenLoc) { 1017 ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoIdLoc); 1018 if (!PDecl) { 1019 Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId; 1020 return true; 1021 } 1022 1023 QualType Ty = Context.getObjCProtoType(); 1024 if (Ty.isNull()) 1025 return true; 1026 Ty = Context.getObjCObjectPointerType(Ty); 1027 return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, ProtoIdLoc, RParenLoc); 1028} 1029 1030/// Try to capture an implicit reference to 'self'. 1031ObjCMethodDecl *Sema::tryCaptureObjCSelf(SourceLocation Loc) { 1032 DeclContext *DC = getFunctionLevelDeclContext(); 1033 1034 // If we're not in an ObjC method, error out. Note that, unlike the 1035 // C++ case, we don't require an instance method --- class methods 1036 // still have a 'self', and we really do still need to capture it! 1037 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(DC); 1038 if (!method) 1039 return 0; 1040 1041 tryCaptureVariable(method->getSelfDecl(), Loc); 1042 1043 return method; 1044} 1045 1046static QualType stripObjCInstanceType(ASTContext &Context, QualType T) { 1047 if (T == Context.getObjCInstanceType()) 1048 return Context.getObjCIdType(); 1049 1050 return T; 1051} 1052 1053QualType Sema::getMessageSendResultType(QualType ReceiverType, 1054 ObjCMethodDecl *Method, 1055 bool isClassMessage, bool isSuperMessage) { 1056 assert(Method && "Must have a method"); 1057 if (!Method->hasRelatedResultType()) 1058 return Method->getSendResultType(); 1059 1060 // If a method has a related return type: 1061 // - if the method found is an instance method, but the message send 1062 // was a class message send, T is the declared return type of the method 1063 // found 1064 if (Method->isInstanceMethod() && isClassMessage) 1065 return stripObjCInstanceType(Context, Method->getSendResultType()); 1066 1067 // - if the receiver is super, T is a pointer to the class of the 1068 // enclosing method definition 1069 if (isSuperMessage) { 1070 if (ObjCMethodDecl *CurMethod = getCurMethodDecl()) 1071 if (ObjCInterfaceDecl *Class = CurMethod->getClassInterface()) 1072 return Context.getObjCObjectPointerType( 1073 Context.getObjCInterfaceType(Class)); 1074 } 1075 1076 // - if the receiver is the name of a class U, T is a pointer to U 1077 if (ReceiverType->getAs<ObjCInterfaceType>() || 1078 ReceiverType->isObjCQualifiedInterfaceType()) 1079 return Context.getObjCObjectPointerType(ReceiverType); 1080 // - if the receiver is of type Class or qualified Class type, 1081 // T is the declared return type of the method. 1082 if (ReceiverType->isObjCClassType() || 1083 ReceiverType->isObjCQualifiedClassType()) 1084 return stripObjCInstanceType(Context, Method->getSendResultType()); 1085 1086 // - if the receiver is id, qualified id, Class, or qualified Class, T 1087 // is the receiver type, otherwise 1088 // - T is the type of the receiver expression. 1089 return ReceiverType; 1090} 1091 1092/// Look for an ObjC method whose result type exactly matches the given type. 1093static const ObjCMethodDecl * 1094findExplicitInstancetypeDeclarer(const ObjCMethodDecl *MD, 1095 QualType instancetype) { 1096 if (MD->getResultType() == instancetype) return MD; 1097 1098 // For these purposes, a method in an @implementation overrides a 1099 // declaration in the @interface. 1100 if (const ObjCImplDecl *impl = 1101 dyn_cast<ObjCImplDecl>(MD->getDeclContext())) { 1102 const ObjCContainerDecl *iface; 1103 if (const ObjCCategoryImplDecl *catImpl = 1104 dyn_cast<ObjCCategoryImplDecl>(impl)) { 1105 iface = catImpl->getCategoryDecl(); 1106 } else { 1107 iface = impl->getClassInterface(); 1108 } 1109 1110 const ObjCMethodDecl *ifaceMD = 1111 iface->getMethod(MD->getSelector(), MD->isInstanceMethod()); 1112 if (ifaceMD) return findExplicitInstancetypeDeclarer(ifaceMD, instancetype); 1113 } 1114 1115 SmallVector<const ObjCMethodDecl *, 4> overrides; 1116 MD->getOverriddenMethods(overrides); 1117 for (unsigned i = 0, e = overrides.size(); i != e; ++i) { 1118 if (const ObjCMethodDecl *result = 1119 findExplicitInstancetypeDeclarer(overrides[i], instancetype)) 1120 return result; 1121 } 1122 1123 return 0; 1124} 1125 1126void Sema::EmitRelatedResultTypeNoteForReturn(QualType destType) { 1127 // Only complain if we're in an ObjC method and the required return 1128 // type doesn't match the method's declared return type. 1129 ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurContext); 1130 if (!MD || !MD->hasRelatedResultType() || 1131 Context.hasSameUnqualifiedType(destType, MD->getResultType())) 1132 return; 1133 1134 // Look for a method overridden by this method which explicitly uses 1135 // 'instancetype'. 1136 if (const ObjCMethodDecl *overridden = 1137 findExplicitInstancetypeDeclarer(MD, Context.getObjCInstanceType())) { 1138 SourceLocation loc; 1139 SourceRange range; 1140 if (TypeSourceInfo *TSI = overridden->getResultTypeSourceInfo()) { 1141 range = TSI->getTypeLoc().getSourceRange(); 1142 loc = range.getBegin(); 1143 } 1144 if (loc.isInvalid()) 1145 loc = overridden->getLocation(); 1146 Diag(loc, diag::note_related_result_type_explicit) 1147 << /*current method*/ 1 << range; 1148 return; 1149 } 1150 1151 // Otherwise, if we have an interesting method family, note that. 1152 // This should always trigger if the above didn't. 1153 if (ObjCMethodFamily family = MD->getMethodFamily()) 1154 Diag(MD->getLocation(), diag::note_related_result_type_family) 1155 << /*current method*/ 1 1156 << family; 1157} 1158 1159void Sema::EmitRelatedResultTypeNote(const Expr *E) { 1160 E = E->IgnoreParenImpCasts(); 1161 const ObjCMessageExpr *MsgSend = dyn_cast<ObjCMessageExpr>(E); 1162 if (!MsgSend) 1163 return; 1164 1165 const ObjCMethodDecl *Method = MsgSend->getMethodDecl(); 1166 if (!Method) 1167 return; 1168 1169 if (!Method->hasRelatedResultType()) 1170 return; 1171 1172 if (Context.hasSameUnqualifiedType(Method->getResultType() 1173 .getNonReferenceType(), 1174 MsgSend->getType())) 1175 return; 1176 1177 if (!Context.hasSameUnqualifiedType(Method->getResultType(), 1178 Context.getObjCInstanceType())) 1179 return; 1180 1181 Diag(Method->getLocation(), diag::note_related_result_type_inferred) 1182 << Method->isInstanceMethod() << Method->getSelector() 1183 << MsgSend->getType(); 1184} 1185 1186bool Sema::CheckMessageArgumentTypes(QualType ReceiverType, 1187 Expr **Args, unsigned NumArgs, 1188 Selector Sel, 1189 ArrayRef<SourceLocation> SelectorLocs, 1190 ObjCMethodDecl *Method, 1191 bool isClassMessage, bool isSuperMessage, 1192 SourceLocation lbrac, SourceLocation rbrac, 1193 QualType &ReturnType, ExprValueKind &VK) { 1194 SourceLocation SelLoc; 1195 if (!SelectorLocs.empty() && SelectorLocs.front().isValid()) 1196 SelLoc = SelectorLocs.front(); 1197 else 1198 SelLoc = lbrac; 1199 1200 if (!Method) { 1201 // Apply default argument promotion as for (C99 6.5.2.2p6). 1202 for (unsigned i = 0; i != NumArgs; i++) { 1203 if (Args[i]->isTypeDependent()) 1204 continue; 1205 1206 ExprResult result; 1207 if (getLangOpts().DebuggerSupport) { 1208 QualType paramTy; // ignored 1209 result = checkUnknownAnyArg(SelLoc, Args[i], paramTy); 1210 } else { 1211 result = DefaultArgumentPromotion(Args[i]); 1212 } 1213 if (result.isInvalid()) 1214 return true; 1215 Args[i] = result.take(); 1216 } 1217 1218 unsigned DiagID; 1219 if (getLangOpts().ObjCAutoRefCount) 1220 DiagID = diag::err_arc_method_not_found; 1221 else 1222 DiagID = isClassMessage ? diag::warn_class_method_not_found 1223 : diag::warn_inst_method_not_found; 1224 if (!getLangOpts().DebuggerSupport) 1225 Diag(SelLoc, DiagID) 1226 << Sel << isClassMessage << SourceRange(SelectorLocs.front(), 1227 SelectorLocs.back()); 1228 1229 // In debuggers, we want to use __unknown_anytype for these 1230 // results so that clients can cast them. 1231 if (getLangOpts().DebuggerSupport) { 1232 ReturnType = Context.UnknownAnyTy; 1233 } else { 1234 ReturnType = Context.getObjCIdType(); 1235 } 1236 VK = VK_RValue; 1237 return false; 1238 } 1239 1240 ReturnType = getMessageSendResultType(ReceiverType, Method, isClassMessage, 1241 isSuperMessage); 1242 VK = Expr::getValueKindForType(Method->getResultType()); 1243 1244 unsigned NumNamedArgs = Sel.getNumArgs(); 1245 // Method might have more arguments than selector indicates. This is due 1246 // to addition of c-style arguments in method. 1247 if (Method->param_size() > Sel.getNumArgs()) 1248 NumNamedArgs = Method->param_size(); 1249 // FIXME. This need be cleaned up. 1250 if (NumArgs < NumNamedArgs) { 1251 Diag(SelLoc, diag::err_typecheck_call_too_few_args) 1252 << 2 << NumNamedArgs << NumArgs; 1253 return false; 1254 } 1255 1256 bool IsError = false; 1257 for (unsigned i = 0; i < NumNamedArgs; i++) { 1258 // We can't do any type-checking on a type-dependent argument. 1259 if (Args[i]->isTypeDependent()) 1260 continue; 1261 1262 Expr *argExpr = Args[i]; 1263 1264 ParmVarDecl *param = Method->param_begin()[i]; 1265 assert(argExpr && "CheckMessageArgumentTypes(): missing expression"); 1266 1267 // Strip the unbridged-cast placeholder expression off unless it's 1268 // a consumed argument. 1269 if (argExpr->hasPlaceholderType(BuiltinType::ARCUnbridgedCast) && 1270 !param->hasAttr<CFConsumedAttr>()) 1271 argExpr = stripARCUnbridgedCast(argExpr); 1272 1273 // If the parameter is __unknown_anytype, infer its type 1274 // from the argument. 1275 if (param->getType() == Context.UnknownAnyTy) { 1276 QualType paramType; 1277 ExprResult argE = checkUnknownAnyArg(SelLoc, argExpr, paramType); 1278 if (argE.isInvalid()) { 1279 IsError = true; 1280 } else { 1281 Args[i] = argE.take(); 1282 1283 // Update the parameter type in-place. 1284 param->setType(paramType); 1285 } 1286 continue; 1287 } 1288 1289 if (RequireCompleteType(argExpr->getSourceRange().getBegin(), 1290 param->getType(), 1291 diag::err_call_incomplete_argument, argExpr)) 1292 return true; 1293 1294 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 1295 param); 1296 ExprResult ArgE = PerformCopyInitialization(Entity, SelLoc, Owned(argExpr)); 1297 if (ArgE.isInvalid()) 1298 IsError = true; 1299 else 1300 Args[i] = ArgE.takeAs<Expr>(); 1301 } 1302 1303 // Promote additional arguments to variadic methods. 1304 if (Method->isVariadic()) { 1305 for (unsigned i = NumNamedArgs; i < NumArgs; ++i) { 1306 if (Args[i]->isTypeDependent()) 1307 continue; 1308 1309 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod, 1310 0); 1311 IsError |= Arg.isInvalid(); 1312 Args[i] = Arg.take(); 1313 } 1314 } else { 1315 // Check for extra arguments to non-variadic methods. 1316 if (NumArgs != NumNamedArgs) { 1317 Diag(Args[NumNamedArgs]->getLocStart(), 1318 diag::err_typecheck_call_too_many_args) 1319 << 2 /*method*/ << NumNamedArgs << NumArgs 1320 << Method->getSourceRange() 1321 << SourceRange(Args[NumNamedArgs]->getLocStart(), 1322 Args[NumArgs-1]->getLocEnd()); 1323 } 1324 } 1325 1326 DiagnoseSentinelCalls(Method, SelLoc, Args, NumArgs); 1327 1328 // Do additional checkings on method. 1329 IsError |= CheckObjCMethodCall(Method, SelLoc, 1330 llvm::makeArrayRef<const Expr *>(Args, NumArgs)); 1331 1332 return IsError; 1333} 1334 1335bool Sema::isSelfExpr(Expr *receiver) { 1336 // 'self' is objc 'self' in an objc method only. 1337 ObjCMethodDecl *method = 1338 dyn_cast_or_null<ObjCMethodDecl>(CurContext->getNonClosureAncestor()); 1339 if (!method) return false; 1340 1341 receiver = receiver->IgnoreParenLValueCasts(); 1342 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(receiver)) 1343 if (DRE->getDecl() == method->getSelfDecl()) 1344 return true; 1345 return false; 1346} 1347 1348/// LookupMethodInType - Look up a method in an ObjCObjectType. 1349ObjCMethodDecl *Sema::LookupMethodInObjectType(Selector sel, QualType type, 1350 bool isInstance) { 1351 const ObjCObjectType *objType = type->castAs<ObjCObjectType>(); 1352 if (ObjCInterfaceDecl *iface = objType->getInterface()) { 1353 // Look it up in the main interface (and categories, etc.) 1354 if (ObjCMethodDecl *method = iface->lookupMethod(sel, isInstance)) 1355 return method; 1356 1357 // Okay, look for "private" methods declared in any 1358 // @implementations we've seen. 1359 if (ObjCMethodDecl *method = iface->lookupPrivateMethod(sel, isInstance)) 1360 return method; 1361 } 1362 1363 // Check qualifiers. 1364 for (ObjCObjectType::qual_iterator 1365 i = objType->qual_begin(), e = objType->qual_end(); i != e; ++i) 1366 if (ObjCMethodDecl *method = (*i)->lookupMethod(sel, isInstance)) 1367 return method; 1368 1369 return 0; 1370} 1371 1372/// LookupMethodInQualifiedType - Lookups up a method in protocol qualifier 1373/// list of a qualified objective pointer type. 1374ObjCMethodDecl *Sema::LookupMethodInQualifiedType(Selector Sel, 1375 const ObjCObjectPointerType *OPT, 1376 bool Instance) 1377{ 1378 ObjCMethodDecl *MD = 0; 1379 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 1380 E = OPT->qual_end(); I != E; ++I) { 1381 ObjCProtocolDecl *PROTO = (*I); 1382 if ((MD = PROTO->lookupMethod(Sel, Instance))) { 1383 return MD; 1384 } 1385 } 1386 return 0; 1387} 1388 1389static void DiagnoseARCUseOfWeakReceiver(Sema &S, Expr *Receiver) { 1390 if (!Receiver) 1391 return; 1392 1393 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(Receiver)) 1394 Receiver = OVE->getSourceExpr(); 1395 1396 Expr *RExpr = Receiver->IgnoreParenImpCasts(); 1397 SourceLocation Loc = RExpr->getLocStart(); 1398 QualType T = RExpr->getType(); 1399 const ObjCPropertyDecl *PDecl = 0; 1400 const ObjCMethodDecl *GDecl = 0; 1401 if (PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(RExpr)) { 1402 RExpr = POE->getSyntacticForm(); 1403 if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(RExpr)) { 1404 if (PRE->isImplicitProperty()) { 1405 GDecl = PRE->getImplicitPropertyGetter(); 1406 if (GDecl) { 1407 T = GDecl->getResultType(); 1408 } 1409 } 1410 else { 1411 PDecl = PRE->getExplicitProperty(); 1412 if (PDecl) { 1413 T = PDecl->getType(); 1414 } 1415 } 1416 } 1417 } 1418 else if (ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(RExpr)) { 1419 // See if receiver is a method which envokes a synthesized getter 1420 // backing a 'weak' property. 1421 ObjCMethodDecl *Method = ME->getMethodDecl(); 1422 if (Method && Method->getSelector().getNumArgs() == 0) { 1423 PDecl = Method->findPropertyDecl(); 1424 if (PDecl) 1425 T = PDecl->getType(); 1426 } 1427 } 1428 1429 if (T.getObjCLifetime() != Qualifiers::OCL_Weak) { 1430 if (!PDecl) 1431 return; 1432 if (!(PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak)) 1433 return; 1434 } 1435 1436 S.Diag(Loc, diag::warn_receiver_is_weak) 1437 << ((!PDecl && !GDecl) ? 0 : (PDecl ? 1 : 2)); 1438 1439 if (PDecl) 1440 S.Diag(PDecl->getLocation(), diag::note_property_declare); 1441 else if (GDecl) 1442 S.Diag(GDecl->getLocation(), diag::note_method_declared_at) << GDecl; 1443 1444 S.Diag(Loc, diag::note_arc_assign_to_strong); 1445} 1446 1447/// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an 1448/// objective C interface. This is a property reference expression. 1449ExprResult Sema:: 1450HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT, 1451 Expr *BaseExpr, SourceLocation OpLoc, 1452 DeclarationName MemberName, 1453 SourceLocation MemberLoc, 1454 SourceLocation SuperLoc, QualType SuperType, 1455 bool Super) { 1456 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType(); 1457 ObjCInterfaceDecl *IFace = IFaceT->getDecl(); 1458 1459 if (!MemberName.isIdentifier()) { 1460 Diag(MemberLoc, diag::err_invalid_property_name) 1461 << MemberName << QualType(OPT, 0); 1462 return ExprError(); 1463 } 1464 1465 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 1466 1467 SourceRange BaseRange = Super? SourceRange(SuperLoc) 1468 : BaseExpr->getSourceRange(); 1469 if (RequireCompleteType(MemberLoc, OPT->getPointeeType(), 1470 diag::err_property_not_found_forward_class, 1471 MemberName, BaseRange)) 1472 return ExprError(); 1473 1474 // Search for a declared property first. 1475 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Member)) { 1476 // Check whether we can reference this property. 1477 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1478 return ExprError(); 1479 if (Super) 1480 return Owned(new (Context) ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, 1481 VK_LValue, OK_ObjCProperty, 1482 MemberLoc, 1483 SuperLoc, SuperType)); 1484 else 1485 return Owned(new (Context) ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, 1486 VK_LValue, OK_ObjCProperty, 1487 MemberLoc, BaseExpr)); 1488 } 1489 // Check protocols on qualified interfaces. 1490 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 1491 E = OPT->qual_end(); I != E; ++I) 1492 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 1493 // Check whether we can reference this property. 1494 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1495 return ExprError(); 1496 1497 if (Super) 1498 return Owned(new (Context) ObjCPropertyRefExpr(PD, 1499 Context.PseudoObjectTy, 1500 VK_LValue, 1501 OK_ObjCProperty, 1502 MemberLoc, 1503 SuperLoc, SuperType)); 1504 else 1505 return Owned(new (Context) ObjCPropertyRefExpr(PD, 1506 Context.PseudoObjectTy, 1507 VK_LValue, 1508 OK_ObjCProperty, 1509 MemberLoc, 1510 BaseExpr)); 1511 } 1512 // If that failed, look for an "implicit" property by seeing if the nullary 1513 // selector is implemented. 1514 1515 // FIXME: The logic for looking up nullary and unary selectors should be 1516 // shared with the code in ActOnInstanceMessage. 1517 1518 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 1519 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 1520 1521 // May be founf in property's qualified list. 1522 if (!Getter) 1523 Getter = LookupMethodInQualifiedType(Sel, OPT, true); 1524 1525 // If this reference is in an @implementation, check for 'private' methods. 1526 if (!Getter) 1527 Getter = IFace->lookupPrivateMethod(Sel); 1528 1529 if (Getter) { 1530 // Check if we can reference this property. 1531 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 1532 return ExprError(); 1533 } 1534 // If we found a getter then this may be a valid dot-reference, we 1535 // will look for the matching setter, in case it is needed. 1536 Selector SetterSel = 1537 SelectorTable::constructSetterName(PP.getIdentifierTable(), 1538 PP.getSelectorTable(), Member); 1539 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 1540 1541 // May be founf in property's qualified list. 1542 if (!Setter) 1543 Setter = LookupMethodInQualifiedType(SetterSel, OPT, true); 1544 1545 if (!Setter) { 1546 // If this reference is in an @implementation, also check for 'private' 1547 // methods. 1548 Setter = IFace->lookupPrivateMethod(SetterSel); 1549 } 1550 1551 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 1552 return ExprError(); 1553 1554 if (Getter || Setter) { 1555 if (Super) 1556 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter, 1557 Context.PseudoObjectTy, 1558 VK_LValue, OK_ObjCProperty, 1559 MemberLoc, 1560 SuperLoc, SuperType)); 1561 else 1562 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter, 1563 Context.PseudoObjectTy, 1564 VK_LValue, OK_ObjCProperty, 1565 MemberLoc, BaseExpr)); 1566 1567 } 1568 1569 // Attempt to correct for typos in property names. 1570 DeclFilterCCC<ObjCPropertyDecl> Validator; 1571 if (TypoCorrection Corrected = CorrectTypo( 1572 DeclarationNameInfo(MemberName, MemberLoc), LookupOrdinaryName, NULL, 1573 NULL, Validator, IFace, false, OPT)) { 1574 ObjCPropertyDecl *Property = 1575 Corrected.getCorrectionDeclAs<ObjCPropertyDecl>(); 1576 DeclarationName TypoResult = Corrected.getCorrection(); 1577 Diag(MemberLoc, diag::err_property_not_found_suggest) 1578 << MemberName << QualType(OPT, 0) << TypoResult 1579 << FixItHint::CreateReplacement(MemberLoc, TypoResult.getAsString()); 1580 Diag(Property->getLocation(), diag::note_previous_decl) 1581 << Property->getDeclName(); 1582 return HandleExprPropertyRefExpr(OPT, BaseExpr, OpLoc, 1583 TypoResult, MemberLoc, 1584 SuperLoc, SuperType, Super); 1585 } 1586 ObjCInterfaceDecl *ClassDeclared; 1587 if (ObjCIvarDecl *Ivar = 1588 IFace->lookupInstanceVariable(Member, ClassDeclared)) { 1589 QualType T = Ivar->getType(); 1590 if (const ObjCObjectPointerType * OBJPT = 1591 T->getAsObjCInterfacePointerType()) { 1592 if (RequireCompleteType(MemberLoc, OBJPT->getPointeeType(), 1593 diag::err_property_not_as_forward_class, 1594 MemberName, BaseExpr)) 1595 return ExprError(); 1596 } 1597 Diag(MemberLoc, 1598 diag::err_ivar_access_using_property_syntax_suggest) 1599 << MemberName << QualType(OPT, 0) << Ivar->getDeclName() 1600 << FixItHint::CreateReplacement(OpLoc, "->"); 1601 return ExprError(); 1602 } 1603 1604 Diag(MemberLoc, diag::err_property_not_found) 1605 << MemberName << QualType(OPT, 0); 1606 if (Setter) 1607 Diag(Setter->getLocation(), diag::note_getter_unavailable) 1608 << MemberName << BaseExpr->getSourceRange(); 1609 return ExprError(); 1610} 1611 1612 1613 1614ExprResult Sema:: 1615ActOnClassPropertyRefExpr(IdentifierInfo &receiverName, 1616 IdentifierInfo &propertyName, 1617 SourceLocation receiverNameLoc, 1618 SourceLocation propertyNameLoc) { 1619 1620 IdentifierInfo *receiverNamePtr = &receiverName; 1621 ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr, 1622 receiverNameLoc); 1623 1624 bool IsSuper = false; 1625 if (IFace == 0) { 1626 // If the "receiver" is 'super' in a method, handle it as an expression-like 1627 // property reference. 1628 if (receiverNamePtr->isStr("super")) { 1629 IsSuper = true; 1630 1631 if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf(receiverNameLoc)) { 1632 if (CurMethod->isInstanceMethod()) { 1633 ObjCInterfaceDecl *Super = 1634 CurMethod->getClassInterface()->getSuperClass(); 1635 if (!Super) { 1636 // The current class does not have a superclass. 1637 Diag(receiverNameLoc, diag::error_root_class_cannot_use_super) 1638 << CurMethod->getClassInterface()->getIdentifier(); 1639 return ExprError(); 1640 } 1641 QualType T = Context.getObjCInterfaceType(Super); 1642 T = Context.getObjCObjectPointerType(T); 1643 1644 return HandleExprPropertyRefExpr(T->getAsObjCInterfacePointerType(), 1645 /*BaseExpr*/0, 1646 SourceLocation()/*OpLoc*/, 1647 &propertyName, 1648 propertyNameLoc, 1649 receiverNameLoc, T, true); 1650 } 1651 1652 // Otherwise, if this is a class method, try dispatching to our 1653 // superclass. 1654 IFace = CurMethod->getClassInterface()->getSuperClass(); 1655 } 1656 } 1657 1658 if (IFace == 0) { 1659 Diag(receiverNameLoc, diag::err_expected_ident_or_lparen); 1660 return ExprError(); 1661 } 1662 } 1663 1664 // Search for a declared property first. 1665 Selector Sel = PP.getSelectorTable().getNullarySelector(&propertyName); 1666 ObjCMethodDecl *Getter = IFace->lookupClassMethod(Sel); 1667 1668 // If this reference is in an @implementation, check for 'private' methods. 1669 if (!Getter) 1670 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1671 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1672 if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation()) 1673 Getter = ImpDecl->getClassMethod(Sel); 1674 1675 if (Getter) { 1676 // FIXME: refactor/share with ActOnMemberReference(). 1677 // Check if we can reference this property. 1678 if (DiagnoseUseOfDecl(Getter, propertyNameLoc)) 1679 return ExprError(); 1680 } 1681 1682 // Look for the matching setter, in case it is needed. 1683 Selector SetterSel = 1684 SelectorTable::constructSetterName(PP.getIdentifierTable(), 1685 PP.getSelectorTable(), &propertyName); 1686 1687 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); 1688 if (!Setter) { 1689 // If this reference is in an @implementation, also check for 'private' 1690 // methods. 1691 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1692 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1693 if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation()) 1694 Setter = ImpDecl->getClassMethod(SetterSel); 1695 } 1696 // Look through local category implementations associated with the class. 1697 if (!Setter) 1698 Setter = IFace->getCategoryClassMethod(SetterSel); 1699 1700 if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc)) 1701 return ExprError(); 1702 1703 if (Getter || Setter) { 1704 if (IsSuper) 1705 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter, 1706 Context.PseudoObjectTy, 1707 VK_LValue, OK_ObjCProperty, 1708 propertyNameLoc, 1709 receiverNameLoc, 1710 Context.getObjCInterfaceType(IFace))); 1711 1712 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter, 1713 Context.PseudoObjectTy, 1714 VK_LValue, OK_ObjCProperty, 1715 propertyNameLoc, 1716 receiverNameLoc, IFace)); 1717 } 1718 return ExprError(Diag(propertyNameLoc, diag::err_property_not_found) 1719 << &propertyName << Context.getObjCInterfaceType(IFace)); 1720} 1721 1722namespace { 1723 1724class ObjCInterfaceOrSuperCCC : public CorrectionCandidateCallback { 1725 public: 1726 ObjCInterfaceOrSuperCCC(ObjCMethodDecl *Method) { 1727 // Determine whether "super" is acceptable in the current context. 1728 if (Method && Method->getClassInterface()) 1729 WantObjCSuper = Method->getClassInterface()->getSuperClass(); 1730 } 1731 1732 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1733 return candidate.getCorrectionDeclAs<ObjCInterfaceDecl>() || 1734 candidate.isKeyword("super"); 1735 } 1736}; 1737 1738} 1739 1740Sema::ObjCMessageKind Sema::getObjCMessageKind(Scope *S, 1741 IdentifierInfo *Name, 1742 SourceLocation NameLoc, 1743 bool IsSuper, 1744 bool HasTrailingDot, 1745 ParsedType &ReceiverType) { 1746 ReceiverType = ParsedType(); 1747 1748 // If the identifier is "super" and there is no trailing dot, we're 1749 // messaging super. If the identifier is "super" and there is a 1750 // trailing dot, it's an instance message. 1751 if (IsSuper && S->isInObjcMethodScope()) 1752 return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage; 1753 1754 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 1755 LookupName(Result, S); 1756 1757 switch (Result.getResultKind()) { 1758 case LookupResult::NotFound: 1759 // Normal name lookup didn't find anything. If we're in an 1760 // Objective-C method, look for ivars. If we find one, we're done! 1761 // FIXME: This is a hack. Ivar lookup should be part of normal 1762 // lookup. 1763 if (ObjCMethodDecl *Method = getCurMethodDecl()) { 1764 if (!Method->getClassInterface()) { 1765 // Fall back: let the parser try to parse it as an instance message. 1766 return ObjCInstanceMessage; 1767 } 1768 1769 ObjCInterfaceDecl *ClassDeclared; 1770 if (Method->getClassInterface()->lookupInstanceVariable(Name, 1771 ClassDeclared)) 1772 return ObjCInstanceMessage; 1773 } 1774 1775 // Break out; we'll perform typo correction below. 1776 break; 1777 1778 case LookupResult::NotFoundInCurrentInstantiation: 1779 case LookupResult::FoundOverloaded: 1780 case LookupResult::FoundUnresolvedValue: 1781 case LookupResult::Ambiguous: 1782 Result.suppressDiagnostics(); 1783 return ObjCInstanceMessage; 1784 1785 case LookupResult::Found: { 1786 // If the identifier is a class or not, and there is a trailing dot, 1787 // it's an instance message. 1788 if (HasTrailingDot) 1789 return ObjCInstanceMessage; 1790 // We found something. If it's a type, then we have a class 1791 // message. Otherwise, it's an instance message. 1792 NamedDecl *ND = Result.getFoundDecl(); 1793 QualType T; 1794 if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND)) 1795 T = Context.getObjCInterfaceType(Class); 1796 else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND)) { 1797 T = Context.getTypeDeclType(Type); 1798 DiagnoseUseOfDecl(Type, NameLoc); 1799 } 1800 else 1801 return ObjCInstanceMessage; 1802 1803 // We have a class message, and T is the type we're 1804 // messaging. Build source-location information for it. 1805 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc); 1806 ReceiverType = CreateParsedType(T, TSInfo); 1807 return ObjCClassMessage; 1808 } 1809 } 1810 1811 ObjCInterfaceOrSuperCCC Validator(getCurMethodDecl()); 1812 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 1813 Result.getLookupKind(), S, NULL, 1814 Validator)) { 1815 if (Corrected.isKeyword()) { 1816 // If we've found the keyword "super" (the only keyword that would be 1817 // returned by CorrectTypo), this is a send to super. 1818 Diag(NameLoc, diag::err_unknown_receiver_suggest) 1819 << Name << Corrected.getCorrection() 1820 << FixItHint::CreateReplacement(SourceRange(NameLoc), "super"); 1821 return ObjCSuperMessage; 1822 } else if (ObjCInterfaceDecl *Class = 1823 Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>()) { 1824 // If we found a declaration, correct when it refers to an Objective-C 1825 // class. 1826 Diag(NameLoc, diag::err_unknown_receiver_suggest) 1827 << Name << Corrected.getCorrection() 1828 << FixItHint::CreateReplacement(SourceRange(NameLoc), 1829 Class->getNameAsString()); 1830 Diag(Class->getLocation(), diag::note_previous_decl) 1831 << Corrected.getCorrection(); 1832 1833 QualType T = Context.getObjCInterfaceType(Class); 1834 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc); 1835 ReceiverType = CreateParsedType(T, TSInfo); 1836 return ObjCClassMessage; 1837 } 1838 } 1839 1840 // Fall back: let the parser try to parse it as an instance message. 1841 return ObjCInstanceMessage; 1842} 1843 1844ExprResult Sema::ActOnSuperMessage(Scope *S, 1845 SourceLocation SuperLoc, 1846 Selector Sel, 1847 SourceLocation LBracLoc, 1848 ArrayRef<SourceLocation> SelectorLocs, 1849 SourceLocation RBracLoc, 1850 MultiExprArg Args) { 1851 // Determine whether we are inside a method or not. 1852 ObjCMethodDecl *Method = tryCaptureObjCSelf(SuperLoc); 1853 if (!Method) { 1854 Diag(SuperLoc, diag::err_invalid_receiver_to_message_super); 1855 return ExprError(); 1856 } 1857 1858 ObjCInterfaceDecl *Class = Method->getClassInterface(); 1859 if (!Class) { 1860 Diag(SuperLoc, diag::error_no_super_class_message) 1861 << Method->getDeclName(); 1862 return ExprError(); 1863 } 1864 1865 ObjCInterfaceDecl *Super = Class->getSuperClass(); 1866 if (!Super) { 1867 // The current class does not have a superclass. 1868 Diag(SuperLoc, diag::error_root_class_cannot_use_super) 1869 << Class->getIdentifier(); 1870 return ExprError(); 1871 } 1872 1873 // We are in a method whose class has a superclass, so 'super' 1874 // is acting as a keyword. 1875 if (Method->getSelector() == Sel) 1876 getCurFunction()->ObjCShouldCallSuper = false; 1877 1878 if (Method->isInstanceMethod()) { 1879 // Since we are in an instance method, this is an instance 1880 // message to the superclass instance. 1881 QualType SuperTy = Context.getObjCInterfaceType(Super); 1882 SuperTy = Context.getObjCObjectPointerType(SuperTy); 1883 return BuildInstanceMessage(0, SuperTy, SuperLoc, 1884 Sel, /*Method=*/0, 1885 LBracLoc, SelectorLocs, RBracLoc, Args); 1886 } 1887 1888 // Since we are in a class method, this is a class message to 1889 // the superclass. 1890 return BuildClassMessage(/*ReceiverTypeInfo=*/0, 1891 Context.getObjCInterfaceType(Super), 1892 SuperLoc, Sel, /*Method=*/0, 1893 LBracLoc, SelectorLocs, RBracLoc, Args); 1894} 1895 1896 1897ExprResult Sema::BuildClassMessageImplicit(QualType ReceiverType, 1898 bool isSuperReceiver, 1899 SourceLocation Loc, 1900 Selector Sel, 1901 ObjCMethodDecl *Method, 1902 MultiExprArg Args) { 1903 TypeSourceInfo *receiverTypeInfo = 0; 1904 if (!ReceiverType.isNull()) 1905 receiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType); 1906 1907 return BuildClassMessage(receiverTypeInfo, ReceiverType, 1908 /*SuperLoc=*/isSuperReceiver ? Loc : SourceLocation(), 1909 Sel, Method, Loc, Loc, Loc, Args, 1910 /*isImplicit=*/true); 1911 1912} 1913 1914static void applyCocoaAPICheck(Sema &S, const ObjCMessageExpr *Msg, 1915 unsigned DiagID, 1916 bool (*refactor)(const ObjCMessageExpr *, 1917 const NSAPI &, edit::Commit &)) { 1918 SourceLocation MsgLoc = Msg->getExprLoc(); 1919 if (S.Diags.getDiagnosticLevel(DiagID, MsgLoc) == DiagnosticsEngine::Ignored) 1920 return; 1921 1922 SourceManager &SM = S.SourceMgr; 1923 edit::Commit ECommit(SM, S.LangOpts); 1924 if (refactor(Msg,*S.NSAPIObj, ECommit)) { 1925 DiagnosticBuilder Builder = S.Diag(MsgLoc, DiagID) 1926 << Msg->getSelector() << Msg->getSourceRange(); 1927 // FIXME: Don't emit diagnostic at all if fixits are non-commitable. 1928 if (!ECommit.isCommitable()) 1929 return; 1930 for (edit::Commit::edit_iterator 1931 I = ECommit.edit_begin(), E = ECommit.edit_end(); I != E; ++I) { 1932 const edit::Commit::Edit &Edit = *I; 1933 switch (Edit.Kind) { 1934 case edit::Commit::Act_Insert: 1935 Builder.AddFixItHint(FixItHint::CreateInsertion(Edit.OrigLoc, 1936 Edit.Text, 1937 Edit.BeforePrev)); 1938 break; 1939 case edit::Commit::Act_InsertFromRange: 1940 Builder.AddFixItHint( 1941 FixItHint::CreateInsertionFromRange(Edit.OrigLoc, 1942 Edit.getInsertFromRange(SM), 1943 Edit.BeforePrev)); 1944 break; 1945 case edit::Commit::Act_Remove: 1946 Builder.AddFixItHint(FixItHint::CreateRemoval(Edit.getFileRange(SM))); 1947 break; 1948 } 1949 } 1950 } 1951} 1952 1953static void checkCocoaAPI(Sema &S, const ObjCMessageExpr *Msg) { 1954 applyCocoaAPICheck(S, Msg, diag::warn_objc_redundant_literal_use, 1955 edit::rewriteObjCRedundantCallWithLiteral); 1956} 1957 1958/// \brief Build an Objective-C class message expression. 1959/// 1960/// This routine takes care of both normal class messages and 1961/// class messages to the superclass. 1962/// 1963/// \param ReceiverTypeInfo Type source information that describes the 1964/// receiver of this message. This may be NULL, in which case we are 1965/// sending to the superclass and \p SuperLoc must be a valid source 1966/// location. 1967 1968/// \param ReceiverType The type of the object receiving the 1969/// message. When \p ReceiverTypeInfo is non-NULL, this is the same 1970/// type as that refers to. For a superclass send, this is the type of 1971/// the superclass. 1972/// 1973/// \param SuperLoc The location of the "super" keyword in a 1974/// superclass message. 1975/// 1976/// \param Sel The selector to which the message is being sent. 1977/// 1978/// \param Method The method that this class message is invoking, if 1979/// already known. 1980/// 1981/// \param LBracLoc The location of the opening square bracket ']'. 1982/// 1983/// \param RBracLoc The location of the closing square bracket ']'. 1984/// 1985/// \param ArgsIn The message arguments. 1986ExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo, 1987 QualType ReceiverType, 1988 SourceLocation SuperLoc, 1989 Selector Sel, 1990 ObjCMethodDecl *Method, 1991 SourceLocation LBracLoc, 1992 ArrayRef<SourceLocation> SelectorLocs, 1993 SourceLocation RBracLoc, 1994 MultiExprArg ArgsIn, 1995 bool isImplicit) { 1996 SourceLocation Loc = SuperLoc.isValid()? SuperLoc 1997 : ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin(); 1998 if (LBracLoc.isInvalid()) { 1999 Diag(Loc, diag::err_missing_open_square_message_send) 2000 << FixItHint::CreateInsertion(Loc, "["); 2001 LBracLoc = Loc; 2002 } 2003 SourceLocation SelLoc; 2004 if (!SelectorLocs.empty() && SelectorLocs.front().isValid()) 2005 SelLoc = SelectorLocs.front(); 2006 else 2007 SelLoc = Loc; 2008 2009 if (ReceiverType->isDependentType()) { 2010 // If the receiver type is dependent, we can't type-check anything 2011 // at this point. Build a dependent expression. 2012 unsigned NumArgs = ArgsIn.size(); 2013 Expr **Args = ArgsIn.data(); 2014 assert(SuperLoc.isInvalid() && "Message to super with dependent type"); 2015 return Owned(ObjCMessageExpr::Create(Context, ReceiverType, 2016 VK_RValue, LBracLoc, ReceiverTypeInfo, 2017 Sel, SelectorLocs, /*Method=*/0, 2018 makeArrayRef(Args, NumArgs),RBracLoc, 2019 isImplicit)); 2020 } 2021 2022 // Find the class to which we are sending this message. 2023 ObjCInterfaceDecl *Class = 0; 2024 const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>(); 2025 if (!ClassType || !(Class = ClassType->getInterface())) { 2026 Diag(Loc, diag::err_invalid_receiver_class_message) 2027 << ReceiverType; 2028 return ExprError(); 2029 } 2030 assert(Class && "We don't know which class we're messaging?"); 2031 // objc++ diagnoses during typename annotation. 2032 if (!getLangOpts().CPlusPlus) 2033 (void)DiagnoseUseOfDecl(Class, SelLoc); 2034 // Find the method we are messaging. 2035 if (!Method) { 2036 SourceRange TypeRange 2037 = SuperLoc.isValid()? SourceRange(SuperLoc) 2038 : ReceiverTypeInfo->getTypeLoc().getSourceRange(); 2039 if (RequireCompleteType(Loc, Context.getObjCInterfaceType(Class), 2040 (getLangOpts().ObjCAutoRefCount 2041 ? diag::err_arc_receiver_forward_class 2042 : diag::warn_receiver_forward_class), 2043 TypeRange)) { 2044 // A forward class used in messaging is treated as a 'Class' 2045 Method = LookupFactoryMethodInGlobalPool(Sel, 2046 SourceRange(LBracLoc, RBracLoc)); 2047 if (Method && !getLangOpts().ObjCAutoRefCount) 2048 Diag(Method->getLocation(), diag::note_method_sent_forward_class) 2049 << Method->getDeclName(); 2050 } 2051 if (!Method) 2052 Method = Class->lookupClassMethod(Sel); 2053 2054 // If we have an implementation in scope, check "private" methods. 2055 if (!Method) 2056 Method = Class->lookupPrivateClassMethod(Sel); 2057 2058 if (Method && DiagnoseUseOfDecl(Method, SelLoc)) 2059 return ExprError(); 2060 } 2061 2062 // Check the argument types and determine the result type. 2063 QualType ReturnType; 2064 ExprValueKind VK = VK_RValue; 2065 2066 unsigned NumArgs = ArgsIn.size(); 2067 Expr **Args = ArgsIn.data(); 2068 if (CheckMessageArgumentTypes(ReceiverType, Args, NumArgs, Sel, SelectorLocs, 2069 Method, true, 2070 SuperLoc.isValid(), LBracLoc, RBracLoc, 2071 ReturnType, VK)) 2072 return ExprError(); 2073 2074 if (Method && !Method->getResultType()->isVoidType() && 2075 RequireCompleteType(LBracLoc, Method->getResultType(), 2076 diag::err_illegal_message_expr_incomplete_type)) 2077 return ExprError(); 2078 2079 // Construct the appropriate ObjCMessageExpr. 2080 ObjCMessageExpr *Result; 2081 if (SuperLoc.isValid()) 2082 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc, 2083 SuperLoc, /*IsInstanceSuper=*/false, 2084 ReceiverType, Sel, SelectorLocs, 2085 Method, makeArrayRef(Args, NumArgs), 2086 RBracLoc, isImplicit); 2087 else { 2088 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc, 2089 ReceiverTypeInfo, Sel, SelectorLocs, 2090 Method, makeArrayRef(Args, NumArgs), 2091 RBracLoc, isImplicit); 2092 if (!isImplicit) 2093 checkCocoaAPI(*this, Result); 2094 } 2095 return MaybeBindToTemporary(Result); 2096} 2097 2098// ActOnClassMessage - used for both unary and keyword messages. 2099// ArgExprs is optional - if it is present, the number of expressions 2100// is obtained from Sel.getNumArgs(). 2101ExprResult Sema::ActOnClassMessage(Scope *S, 2102 ParsedType Receiver, 2103 Selector Sel, 2104 SourceLocation LBracLoc, 2105 ArrayRef<SourceLocation> SelectorLocs, 2106 SourceLocation RBracLoc, 2107 MultiExprArg Args) { 2108 TypeSourceInfo *ReceiverTypeInfo; 2109 QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo); 2110 if (ReceiverType.isNull()) 2111 return ExprError(); 2112 2113 2114 if (!ReceiverTypeInfo) 2115 ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc); 2116 2117 return BuildClassMessage(ReceiverTypeInfo, ReceiverType, 2118 /*SuperLoc=*/SourceLocation(), Sel, /*Method=*/0, 2119 LBracLoc, SelectorLocs, RBracLoc, Args); 2120} 2121 2122ExprResult Sema::BuildInstanceMessageImplicit(Expr *Receiver, 2123 QualType ReceiverType, 2124 SourceLocation Loc, 2125 Selector Sel, 2126 ObjCMethodDecl *Method, 2127 MultiExprArg Args) { 2128 return BuildInstanceMessage(Receiver, ReceiverType, 2129 /*SuperLoc=*/!Receiver ? Loc : SourceLocation(), 2130 Sel, Method, Loc, Loc, Loc, Args, 2131 /*isImplicit=*/true); 2132} 2133 2134/// \brief Build an Objective-C instance message expression. 2135/// 2136/// This routine takes care of both normal instance messages and 2137/// instance messages to the superclass instance. 2138/// 2139/// \param Receiver The expression that computes the object that will 2140/// receive this message. This may be empty, in which case we are 2141/// sending to the superclass instance and \p SuperLoc must be a valid 2142/// source location. 2143/// 2144/// \param ReceiverType The (static) type of the object receiving the 2145/// message. When a \p Receiver expression is provided, this is the 2146/// same type as that expression. For a superclass instance send, this 2147/// is a pointer to the type of the superclass. 2148/// 2149/// \param SuperLoc The location of the "super" keyword in a 2150/// superclass instance message. 2151/// 2152/// \param Sel The selector to which the message is being sent. 2153/// 2154/// \param Method The method that this instance message is invoking, if 2155/// already known. 2156/// 2157/// \param LBracLoc The location of the opening square bracket ']'. 2158/// 2159/// \param RBracLoc The location of the closing square bracket ']'. 2160/// 2161/// \param ArgsIn The message arguments. 2162ExprResult Sema::BuildInstanceMessage(Expr *Receiver, 2163 QualType ReceiverType, 2164 SourceLocation SuperLoc, 2165 Selector Sel, 2166 ObjCMethodDecl *Method, 2167 SourceLocation LBracLoc, 2168 ArrayRef<SourceLocation> SelectorLocs, 2169 SourceLocation RBracLoc, 2170 MultiExprArg ArgsIn, 2171 bool isImplicit) { 2172 // The location of the receiver. 2173 SourceLocation Loc = SuperLoc.isValid()? SuperLoc : Receiver->getLocStart(); 2174 SourceRange RecRange = 2175 SuperLoc.isValid()? SuperLoc : Receiver->getSourceRange(); 2176 SourceLocation SelLoc; 2177 if (!SelectorLocs.empty() && SelectorLocs.front().isValid()) 2178 SelLoc = SelectorLocs.front(); 2179 else 2180 SelLoc = Loc; 2181 2182 if (LBracLoc.isInvalid()) { 2183 Diag(Loc, diag::err_missing_open_square_message_send) 2184 << FixItHint::CreateInsertion(Loc, "["); 2185 LBracLoc = Loc; 2186 } 2187 2188 // If we have a receiver expression, perform appropriate promotions 2189 // and determine receiver type. 2190 if (Receiver) { 2191 if (Receiver->hasPlaceholderType()) { 2192 ExprResult Result; 2193 if (Receiver->getType() == Context.UnknownAnyTy) 2194 Result = forceUnknownAnyToType(Receiver, Context.getObjCIdType()); 2195 else 2196 Result = CheckPlaceholderExpr(Receiver); 2197 if (Result.isInvalid()) return ExprError(); 2198 Receiver = Result.take(); 2199 } 2200 2201 if (Receiver->isTypeDependent()) { 2202 // If the receiver is type-dependent, we can't type-check anything 2203 // at this point. Build a dependent expression. 2204 unsigned NumArgs = ArgsIn.size(); 2205 Expr **Args = ArgsIn.data(); 2206 assert(SuperLoc.isInvalid() && "Message to super with dependent type"); 2207 return Owned(ObjCMessageExpr::Create(Context, Context.DependentTy, 2208 VK_RValue, LBracLoc, Receiver, Sel, 2209 SelectorLocs, /*Method=*/0, 2210 makeArrayRef(Args, NumArgs), 2211 RBracLoc, isImplicit)); 2212 } 2213 2214 // If necessary, apply function/array conversion to the receiver. 2215 // C99 6.7.5.3p[7,8]. 2216 ExprResult Result = DefaultFunctionArrayLvalueConversion(Receiver); 2217 if (Result.isInvalid()) 2218 return ExprError(); 2219 Receiver = Result.take(); 2220 ReceiverType = Receiver->getType(); 2221 2222 // If the receiver is an ObjC pointer, a block pointer, or an 2223 // __attribute__((NSObject)) pointer, we don't need to do any 2224 // special conversion in order to look up a receiver. 2225 if (ReceiverType->isObjCRetainableType()) { 2226 // do nothing 2227 } else if (!getLangOpts().ObjCAutoRefCount && 2228 !Context.getObjCIdType().isNull() && 2229 (ReceiverType->isPointerType() || 2230 ReceiverType->isIntegerType())) { 2231 // Implicitly convert integers and pointers to 'id' but emit a warning. 2232 // But not in ARC. 2233 Diag(Loc, diag::warn_bad_receiver_type) 2234 << ReceiverType 2235 << Receiver->getSourceRange(); 2236 if (ReceiverType->isPointerType()) { 2237 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(), 2238 CK_CPointerToObjCPointerCast).take(); 2239 } else { 2240 // TODO: specialized warning on null receivers? 2241 bool IsNull = Receiver->isNullPointerConstant(Context, 2242 Expr::NPC_ValueDependentIsNull); 2243 CastKind Kind = IsNull ? CK_NullToPointer : CK_IntegralToPointer; 2244 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(), 2245 Kind).take(); 2246 } 2247 ReceiverType = Receiver->getType(); 2248 } else if (getLangOpts().CPlusPlus) { 2249 ExprResult result = PerformContextuallyConvertToObjCPointer(Receiver); 2250 if (result.isUsable()) { 2251 Receiver = result.take(); 2252 ReceiverType = Receiver->getType(); 2253 } 2254 } 2255 } 2256 2257 // There's a somewhat weird interaction here where we assume that we 2258 // won't actually have a method unless we also don't need to do some 2259 // of the more detailed type-checking on the receiver. 2260 2261 if (!Method) { 2262 // Handle messages to id. 2263 bool receiverIsId = ReceiverType->isObjCIdType(); 2264 if (receiverIsId || ReceiverType->isBlockPointerType() || 2265 (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) { 2266 Method = LookupInstanceMethodInGlobalPool(Sel, 2267 SourceRange(LBracLoc, RBracLoc), 2268 receiverIsId); 2269 if (!Method) 2270 Method = LookupFactoryMethodInGlobalPool(Sel, 2271 SourceRange(LBracLoc,RBracLoc), 2272 receiverIsId); 2273 } else if (ReceiverType->isObjCClassType() || 2274 ReceiverType->isObjCQualifiedClassType()) { 2275 // Handle messages to Class. 2276 // We allow sending a message to a qualified Class ("Class<foo>"), which 2277 // is ok as long as one of the protocols implements the selector (if not, warn). 2278 if (const ObjCObjectPointerType *QClassTy 2279 = ReceiverType->getAsObjCQualifiedClassType()) { 2280 // Search protocols for class methods. 2281 Method = LookupMethodInQualifiedType(Sel, QClassTy, false); 2282 if (!Method) { 2283 Method = LookupMethodInQualifiedType(Sel, QClassTy, true); 2284 // warn if instance method found for a Class message. 2285 if (Method) { 2286 Diag(SelLoc, diag::warn_instance_method_on_class_found) 2287 << Method->getSelector() << Sel; 2288 Diag(Method->getLocation(), diag::note_method_declared_at) 2289 << Method->getDeclName(); 2290 } 2291 } 2292 } else { 2293 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) { 2294 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) { 2295 // First check the public methods in the class interface. 2296 Method = ClassDecl->lookupClassMethod(Sel); 2297 2298 if (!Method) 2299 Method = ClassDecl->lookupPrivateClassMethod(Sel); 2300 } 2301 if (Method && DiagnoseUseOfDecl(Method, SelLoc)) 2302 return ExprError(); 2303 } 2304 if (!Method) { 2305 // If not messaging 'self', look for any factory method named 'Sel'. 2306 if (!Receiver || !isSelfExpr(Receiver)) { 2307 Method = LookupFactoryMethodInGlobalPool(Sel, 2308 SourceRange(LBracLoc, RBracLoc), 2309 true); 2310 if (!Method) { 2311 // If no class (factory) method was found, check if an _instance_ 2312 // method of the same name exists in the root class only. 2313 Method = LookupInstanceMethodInGlobalPool(Sel, 2314 SourceRange(LBracLoc, RBracLoc), 2315 true); 2316 if (Method) 2317 if (const ObjCInterfaceDecl *ID = 2318 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) { 2319 if (ID->getSuperClass()) 2320 Diag(SelLoc, diag::warn_root_inst_method_not_found) 2321 << Sel << SourceRange(LBracLoc, RBracLoc); 2322 } 2323 } 2324 } 2325 } 2326 } 2327 } else { 2328 ObjCInterfaceDecl* ClassDecl = 0; 2329 2330 // We allow sending a message to a qualified ID ("id<foo>"), which is ok as 2331 // long as one of the protocols implements the selector (if not, warn). 2332 // And as long as message is not deprecated/unavailable (warn if it is). 2333 if (const ObjCObjectPointerType *QIdTy 2334 = ReceiverType->getAsObjCQualifiedIdType()) { 2335 // Search protocols for instance methods. 2336 Method = LookupMethodInQualifiedType(Sel, QIdTy, true); 2337 if (!Method) 2338 Method = LookupMethodInQualifiedType(Sel, QIdTy, false); 2339 if (Method && DiagnoseUseOfDecl(Method, SelLoc)) 2340 return ExprError(); 2341 } else if (const ObjCObjectPointerType *OCIType 2342 = ReceiverType->getAsObjCInterfacePointerType()) { 2343 // We allow sending a message to a pointer to an interface (an object). 2344 ClassDecl = OCIType->getInterfaceDecl(); 2345 2346 // Try to complete the type. Under ARC, this is a hard error from which 2347 // we don't try to recover. 2348 const ObjCInterfaceDecl *forwardClass = 0; 2349 if (RequireCompleteType(Loc, OCIType->getPointeeType(), 2350 getLangOpts().ObjCAutoRefCount 2351 ? diag::err_arc_receiver_forward_instance 2352 : diag::warn_receiver_forward_instance, 2353 Receiver? Receiver->getSourceRange() 2354 : SourceRange(SuperLoc))) { 2355 if (getLangOpts().ObjCAutoRefCount) 2356 return ExprError(); 2357 2358 forwardClass = OCIType->getInterfaceDecl(); 2359 Diag(Receiver ? Receiver->getLocStart() 2360 : SuperLoc, diag::note_receiver_is_id); 2361 Method = 0; 2362 } else { 2363 Method = ClassDecl->lookupInstanceMethod(Sel); 2364 } 2365 2366 if (!Method) 2367 // Search protocol qualifiers. 2368 Method = LookupMethodInQualifiedType(Sel, OCIType, true); 2369 2370 if (!Method) { 2371 // If we have implementations in scope, check "private" methods. 2372 Method = ClassDecl->lookupPrivateMethod(Sel); 2373 2374 if (!Method && getLangOpts().ObjCAutoRefCount) { 2375 Diag(SelLoc, diag::err_arc_may_not_respond) 2376 << OCIType->getPointeeType() << Sel << RecRange 2377 << SourceRange(SelectorLocs.front(), SelectorLocs.back()); 2378 return ExprError(); 2379 } 2380 2381 if (!Method && (!Receiver || !isSelfExpr(Receiver))) { 2382 // If we still haven't found a method, look in the global pool. This 2383 // behavior isn't very desirable, however we need it for GCC 2384 // compatibility. FIXME: should we deviate?? 2385 if (OCIType->qual_empty()) { 2386 Method = LookupInstanceMethodInGlobalPool(Sel, 2387 SourceRange(LBracLoc, RBracLoc)); 2388 if (Method && !forwardClass) 2389 Diag(SelLoc, diag::warn_maynot_respond) 2390 << OCIType->getInterfaceDecl()->getIdentifier() 2391 << Sel << RecRange; 2392 } 2393 } 2394 } 2395 if (Method && DiagnoseUseOfDecl(Method, SelLoc, forwardClass)) 2396 return ExprError(); 2397 } else { 2398 // Reject other random receiver types (e.g. structs). 2399 Diag(Loc, diag::err_bad_receiver_type) 2400 << ReceiverType << Receiver->getSourceRange(); 2401 return ExprError(); 2402 } 2403 } 2404 } 2405 2406 // Check the message arguments. 2407 unsigned NumArgs = ArgsIn.size(); 2408 Expr **Args = ArgsIn.data(); 2409 QualType ReturnType; 2410 ExprValueKind VK = VK_RValue; 2411 bool ClassMessage = (ReceiverType->isObjCClassType() || 2412 ReceiverType->isObjCQualifiedClassType()); 2413 if (CheckMessageArgumentTypes(ReceiverType, Args, NumArgs, Sel, 2414 SelectorLocs, Method, 2415 ClassMessage, SuperLoc.isValid(), 2416 LBracLoc, RBracLoc, ReturnType, VK)) 2417 return ExprError(); 2418 2419 if (Method && !Method->getResultType()->isVoidType() && 2420 RequireCompleteType(LBracLoc, Method->getResultType(), 2421 diag::err_illegal_message_expr_incomplete_type)) 2422 return ExprError(); 2423 2424 // In ARC, forbid the user from sending messages to 2425 // retain/release/autorelease/dealloc/retainCount explicitly. 2426 if (getLangOpts().ObjCAutoRefCount) { 2427 ObjCMethodFamily family = 2428 (Method ? Method->getMethodFamily() : Sel.getMethodFamily()); 2429 switch (family) { 2430 case OMF_init: 2431 if (Method) 2432 checkInitMethod(Method, ReceiverType); 2433 2434 case OMF_None: 2435 case OMF_alloc: 2436 case OMF_copy: 2437 case OMF_finalize: 2438 case OMF_mutableCopy: 2439 case OMF_new: 2440 case OMF_self: 2441 break; 2442 2443 case OMF_dealloc: 2444 case OMF_retain: 2445 case OMF_release: 2446 case OMF_autorelease: 2447 case OMF_retainCount: 2448 Diag(SelLoc, diag::err_arc_illegal_explicit_message) 2449 << Sel << RecRange; 2450 break; 2451 2452 case OMF_performSelector: 2453 if (Method && NumArgs >= 1) { 2454 if (ObjCSelectorExpr *SelExp = dyn_cast<ObjCSelectorExpr>(Args[0])) { 2455 Selector ArgSel = SelExp->getSelector(); 2456 ObjCMethodDecl *SelMethod = 2457 LookupInstanceMethodInGlobalPool(ArgSel, 2458 SelExp->getSourceRange()); 2459 if (!SelMethod) 2460 SelMethod = 2461 LookupFactoryMethodInGlobalPool(ArgSel, 2462 SelExp->getSourceRange()); 2463 if (SelMethod) { 2464 ObjCMethodFamily SelFamily = SelMethod->getMethodFamily(); 2465 switch (SelFamily) { 2466 case OMF_alloc: 2467 case OMF_copy: 2468 case OMF_mutableCopy: 2469 case OMF_new: 2470 case OMF_self: 2471 case OMF_init: 2472 // Issue error, unless ns_returns_not_retained. 2473 if (!SelMethod->hasAttr<NSReturnsNotRetainedAttr>()) { 2474 // selector names a +1 method 2475 Diag(SelLoc, 2476 diag::err_arc_perform_selector_retains); 2477 Diag(SelMethod->getLocation(), diag::note_method_declared_at) 2478 << SelMethod->getDeclName(); 2479 } 2480 break; 2481 default: 2482 // +0 call. OK. unless ns_returns_retained. 2483 if (SelMethod->hasAttr<NSReturnsRetainedAttr>()) { 2484 // selector names a +1 method 2485 Diag(SelLoc, 2486 diag::err_arc_perform_selector_retains); 2487 Diag(SelMethod->getLocation(), diag::note_method_declared_at) 2488 << SelMethod->getDeclName(); 2489 } 2490 break; 2491 } 2492 } 2493 } else { 2494 // error (may leak). 2495 Diag(SelLoc, diag::warn_arc_perform_selector_leaks); 2496 Diag(Args[0]->getExprLoc(), diag::note_used_here); 2497 } 2498 } 2499 break; 2500 } 2501 } 2502 2503 // Construct the appropriate ObjCMessageExpr instance. 2504 ObjCMessageExpr *Result; 2505 if (SuperLoc.isValid()) 2506 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc, 2507 SuperLoc, /*IsInstanceSuper=*/true, 2508 ReceiverType, Sel, SelectorLocs, Method, 2509 makeArrayRef(Args, NumArgs), RBracLoc, 2510 isImplicit); 2511 else { 2512 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc, 2513 Receiver, Sel, SelectorLocs, Method, 2514 makeArrayRef(Args, NumArgs), RBracLoc, 2515 isImplicit); 2516 if (!isImplicit) 2517 checkCocoaAPI(*this, Result); 2518 } 2519 2520 if (getLangOpts().ObjCAutoRefCount) { 2521 DiagnoseARCUseOfWeakReceiver(*this, Receiver); 2522 2523 // In ARC, annotate delegate init calls. 2524 if (Result->getMethodFamily() == OMF_init && 2525 (SuperLoc.isValid() || isSelfExpr(Receiver))) { 2526 // Only consider init calls *directly* in init implementations, 2527 // not within blocks. 2528 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(CurContext); 2529 if (method && method->getMethodFamily() == OMF_init) { 2530 // The implicit assignment to self means we also don't want to 2531 // consume the result. 2532 Result->setDelegateInitCall(true); 2533 return Owned(Result); 2534 } 2535 } 2536 2537 // In ARC, check for message sends which are likely to introduce 2538 // retain cycles. 2539 checkRetainCycles(Result); 2540 2541 if (!isImplicit && Method) { 2542 if (const ObjCPropertyDecl *Prop = Method->findPropertyDecl()) { 2543 bool IsWeak = 2544 Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak; 2545 if (!IsWeak && Sel.isUnarySelector()) 2546 IsWeak = ReturnType.getObjCLifetime() & Qualifiers::OCL_Weak; 2547 2548 if (IsWeak) { 2549 DiagnosticsEngine::Level Level = 2550 Diags.getDiagnosticLevel(diag::warn_arc_repeated_use_of_weak, 2551 LBracLoc); 2552 if (Level != DiagnosticsEngine::Ignored) 2553 getCurFunction()->recordUseOfWeak(Result, Prop); 2554 2555 } 2556 } 2557 } 2558 } 2559 2560 return MaybeBindToTemporary(Result); 2561} 2562 2563static void RemoveSelectorFromWarningCache(Sema &S, Expr* Arg) { 2564 if (ObjCSelectorExpr *OSE = 2565 dyn_cast<ObjCSelectorExpr>(Arg->IgnoreParenCasts())) { 2566 Selector Sel = OSE->getSelector(); 2567 SourceLocation Loc = OSE->getAtLoc(); 2568 llvm::DenseMap<Selector, SourceLocation>::iterator Pos 2569 = S.ReferencedSelectors.find(Sel); 2570 if (Pos != S.ReferencedSelectors.end() && Pos->second == Loc) 2571 S.ReferencedSelectors.erase(Pos); 2572 } 2573} 2574 2575// ActOnInstanceMessage - used for both unary and keyword messages. 2576// ArgExprs is optional - if it is present, the number of expressions 2577// is obtained from Sel.getNumArgs(). 2578ExprResult Sema::ActOnInstanceMessage(Scope *S, 2579 Expr *Receiver, 2580 Selector Sel, 2581 SourceLocation LBracLoc, 2582 ArrayRef<SourceLocation> SelectorLocs, 2583 SourceLocation RBracLoc, 2584 MultiExprArg Args) { 2585 if (!Receiver) 2586 return ExprError(); 2587 2588 // A ParenListExpr can show up while doing error recovery with invalid code. 2589 if (isa<ParenListExpr>(Receiver)) { 2590 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Receiver); 2591 if (Result.isInvalid()) return ExprError(); 2592 Receiver = Result.take(); 2593 } 2594 2595 if (RespondsToSelectorSel.isNull()) { 2596 IdentifierInfo *SelectorId = &Context.Idents.get("respondsToSelector"); 2597 RespondsToSelectorSel = Context.Selectors.getUnarySelector(SelectorId); 2598 } 2599 if (Sel == RespondsToSelectorSel) 2600 RemoveSelectorFromWarningCache(*this, Args[0]); 2601 2602 return BuildInstanceMessage(Receiver, Receiver->getType(), 2603 /*SuperLoc=*/SourceLocation(), Sel, /*Method=*/0, 2604 LBracLoc, SelectorLocs, RBracLoc, Args); 2605} 2606 2607enum ARCConversionTypeClass { 2608 /// int, void, struct A 2609 ACTC_none, 2610 2611 /// id, void (^)() 2612 ACTC_retainable, 2613 2614 /// id*, id***, void (^*)(), 2615 ACTC_indirectRetainable, 2616 2617 /// void* might be a normal C type, or it might a CF type. 2618 ACTC_voidPtr, 2619 2620 /// struct A* 2621 ACTC_coreFoundation 2622}; 2623static bool isAnyRetainable(ARCConversionTypeClass ACTC) { 2624 return (ACTC == ACTC_retainable || 2625 ACTC == ACTC_coreFoundation || 2626 ACTC == ACTC_voidPtr); 2627} 2628static bool isAnyCLike(ARCConversionTypeClass ACTC) { 2629 return ACTC == ACTC_none || 2630 ACTC == ACTC_voidPtr || 2631 ACTC == ACTC_coreFoundation; 2632} 2633 2634static ARCConversionTypeClass classifyTypeForARCConversion(QualType type) { 2635 bool isIndirect = false; 2636 2637 // Ignore an outermost reference type. 2638 if (const ReferenceType *ref = type->getAs<ReferenceType>()) { 2639 type = ref->getPointeeType(); 2640 isIndirect = true; 2641 } 2642 2643 // Drill through pointers and arrays recursively. 2644 while (true) { 2645 if (const PointerType *ptr = type->getAs<PointerType>()) { 2646 type = ptr->getPointeeType(); 2647 2648 // The first level of pointer may be the innermost pointer on a CF type. 2649 if (!isIndirect) { 2650 if (type->isVoidType()) return ACTC_voidPtr; 2651 if (type->isRecordType()) return ACTC_coreFoundation; 2652 } 2653 } else if (const ArrayType *array = type->getAsArrayTypeUnsafe()) { 2654 type = QualType(array->getElementType()->getBaseElementTypeUnsafe(), 0); 2655 } else { 2656 break; 2657 } 2658 isIndirect = true; 2659 } 2660 2661 if (isIndirect) { 2662 if (type->isObjCARCBridgableType()) 2663 return ACTC_indirectRetainable; 2664 return ACTC_none; 2665 } 2666 2667 if (type->isObjCARCBridgableType()) 2668 return ACTC_retainable; 2669 2670 return ACTC_none; 2671} 2672 2673namespace { 2674 /// A result from the cast checker. 2675 enum ACCResult { 2676 /// Cannot be casted. 2677 ACC_invalid, 2678 2679 /// Can be safely retained or not retained. 2680 ACC_bottom, 2681 2682 /// Can be casted at +0. 2683 ACC_plusZero, 2684 2685 /// Can be casted at +1. 2686 ACC_plusOne 2687 }; 2688 ACCResult merge(ACCResult left, ACCResult right) { 2689 if (left == right) return left; 2690 if (left == ACC_bottom) return right; 2691 if (right == ACC_bottom) return left; 2692 return ACC_invalid; 2693 } 2694 2695 /// A checker which white-lists certain expressions whose conversion 2696 /// to or from retainable type would otherwise be forbidden in ARC. 2697 class ARCCastChecker : public StmtVisitor<ARCCastChecker, ACCResult> { 2698 typedef StmtVisitor<ARCCastChecker, ACCResult> super; 2699 2700 ASTContext &Context; 2701 ARCConversionTypeClass SourceClass; 2702 ARCConversionTypeClass TargetClass; 2703 bool Diagnose; 2704 2705 static bool isCFType(QualType type) { 2706 // Someday this can use ns_bridged. For now, it has to do this. 2707 return type->isCARCBridgableType(); 2708 } 2709 2710 public: 2711 ARCCastChecker(ASTContext &Context, ARCConversionTypeClass source, 2712 ARCConversionTypeClass target, bool diagnose) 2713 : Context(Context), SourceClass(source), TargetClass(target), 2714 Diagnose(diagnose) {} 2715 2716 using super::Visit; 2717 ACCResult Visit(Expr *e) { 2718 return super::Visit(e->IgnoreParens()); 2719 } 2720 2721 ACCResult VisitStmt(Stmt *s) { 2722 return ACC_invalid; 2723 } 2724 2725 /// Null pointer constants can be casted however you please. 2726 ACCResult VisitExpr(Expr *e) { 2727 if (e->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull)) 2728 return ACC_bottom; 2729 return ACC_invalid; 2730 } 2731 2732 /// Objective-C string literals can be safely casted. 2733 ACCResult VisitObjCStringLiteral(ObjCStringLiteral *e) { 2734 // If we're casting to any retainable type, go ahead. Global 2735 // strings are immune to retains, so this is bottom. 2736 if (isAnyRetainable(TargetClass)) return ACC_bottom; 2737 2738 return ACC_invalid; 2739 } 2740 2741 /// Look through certain implicit and explicit casts. 2742 ACCResult VisitCastExpr(CastExpr *e) { 2743 switch (e->getCastKind()) { 2744 case CK_NullToPointer: 2745 return ACC_bottom; 2746 2747 case CK_NoOp: 2748 case CK_LValueToRValue: 2749 case CK_BitCast: 2750 case CK_CPointerToObjCPointerCast: 2751 case CK_BlockPointerToObjCPointerCast: 2752 case CK_AnyPointerToBlockPointerCast: 2753 return Visit(e->getSubExpr()); 2754 2755 default: 2756 return ACC_invalid; 2757 } 2758 } 2759 2760 /// Look through unary extension. 2761 ACCResult VisitUnaryExtension(UnaryOperator *e) { 2762 return Visit(e->getSubExpr()); 2763 } 2764 2765 /// Ignore the LHS of a comma operator. 2766 ACCResult VisitBinComma(BinaryOperator *e) { 2767 return Visit(e->getRHS()); 2768 } 2769 2770 /// Conditional operators are okay if both sides are okay. 2771 ACCResult VisitConditionalOperator(ConditionalOperator *e) { 2772 ACCResult left = Visit(e->getTrueExpr()); 2773 if (left == ACC_invalid) return ACC_invalid; 2774 return merge(left, Visit(e->getFalseExpr())); 2775 } 2776 2777 /// Look through pseudo-objects. 2778 ACCResult VisitPseudoObjectExpr(PseudoObjectExpr *e) { 2779 // If we're getting here, we should always have a result. 2780 return Visit(e->getResultExpr()); 2781 } 2782 2783 /// Statement expressions are okay if their result expression is okay. 2784 ACCResult VisitStmtExpr(StmtExpr *e) { 2785 return Visit(e->getSubStmt()->body_back()); 2786 } 2787 2788 /// Some declaration references are okay. 2789 ACCResult VisitDeclRefExpr(DeclRefExpr *e) { 2790 // References to global constants from system headers are okay. 2791 // These are things like 'kCFStringTransformToLatin'. They are 2792 // can also be assumed to be immune to retains. 2793 VarDecl *var = dyn_cast<VarDecl>(e->getDecl()); 2794 if (isAnyRetainable(TargetClass) && 2795 isAnyRetainable(SourceClass) && 2796 var && 2797 var->getStorageClass() == SC_Extern && 2798 var->getType().isConstQualified() && 2799 Context.getSourceManager().isInSystemHeader(var->getLocation())) { 2800 return ACC_bottom; 2801 } 2802 2803 // Nothing else. 2804 return ACC_invalid; 2805 } 2806 2807 /// Some calls are okay. 2808 ACCResult VisitCallExpr(CallExpr *e) { 2809 if (FunctionDecl *fn = e->getDirectCallee()) 2810 if (ACCResult result = checkCallToFunction(fn)) 2811 return result; 2812 2813 return super::VisitCallExpr(e); 2814 } 2815 2816 ACCResult checkCallToFunction(FunctionDecl *fn) { 2817 // Require a CF*Ref return type. 2818 if (!isCFType(fn->getResultType())) 2819 return ACC_invalid; 2820 2821 if (!isAnyRetainable(TargetClass)) 2822 return ACC_invalid; 2823 2824 // Honor an explicit 'not retained' attribute. 2825 if (fn->hasAttr<CFReturnsNotRetainedAttr>()) 2826 return ACC_plusZero; 2827 2828 // Honor an explicit 'retained' attribute, except that for 2829 // now we're not going to permit implicit handling of +1 results, 2830 // because it's a bit frightening. 2831 if (fn->hasAttr<CFReturnsRetainedAttr>()) 2832 return Diagnose ? ACC_plusOne 2833 : ACC_invalid; // ACC_plusOne if we start accepting this 2834 2835 // Recognize this specific builtin function, which is used by CFSTR. 2836 unsigned builtinID = fn->getBuiltinID(); 2837 if (builtinID == Builtin::BI__builtin___CFStringMakeConstantString) 2838 return ACC_bottom; 2839 2840 // Otherwise, don't do anything implicit with an unaudited function. 2841 if (!fn->hasAttr<CFAuditedTransferAttr>()) 2842 return ACC_invalid; 2843 2844 // Otherwise, it's +0 unless it follows the create convention. 2845 if (ento::coreFoundation::followsCreateRule(fn)) 2846 return Diagnose ? ACC_plusOne 2847 : ACC_invalid; // ACC_plusOne if we start accepting this 2848 2849 return ACC_plusZero; 2850 } 2851 2852 ACCResult VisitObjCMessageExpr(ObjCMessageExpr *e) { 2853 return checkCallToMethod(e->getMethodDecl()); 2854 } 2855 2856 ACCResult VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *e) { 2857 ObjCMethodDecl *method; 2858 if (e->isExplicitProperty()) 2859 method = e->getExplicitProperty()->getGetterMethodDecl(); 2860 else 2861 method = e->getImplicitPropertyGetter(); 2862 return checkCallToMethod(method); 2863 } 2864 2865 ACCResult checkCallToMethod(ObjCMethodDecl *method) { 2866 if (!method) return ACC_invalid; 2867 2868 // Check for message sends to functions returning CF types. We 2869 // just obey the Cocoa conventions with these, even though the 2870 // return type is CF. 2871 if (!isAnyRetainable(TargetClass) || !isCFType(method->getResultType())) 2872 return ACC_invalid; 2873 2874 // If the method is explicitly marked not-retained, it's +0. 2875 if (method->hasAttr<CFReturnsNotRetainedAttr>()) 2876 return ACC_plusZero; 2877 2878 // If the method is explicitly marked as returning retained, or its 2879 // selector follows a +1 Cocoa convention, treat it as +1. 2880 if (method->hasAttr<CFReturnsRetainedAttr>()) 2881 return ACC_plusOne; 2882 2883 switch (method->getSelector().getMethodFamily()) { 2884 case OMF_alloc: 2885 case OMF_copy: 2886 case OMF_mutableCopy: 2887 case OMF_new: 2888 return ACC_plusOne; 2889 2890 default: 2891 // Otherwise, treat it as +0. 2892 return ACC_plusZero; 2893 } 2894 } 2895 }; 2896} 2897 2898bool Sema::isKnownName(StringRef name) { 2899 if (name.empty()) 2900 return false; 2901 LookupResult R(*this, &Context.Idents.get(name), SourceLocation(), 2902 Sema::LookupOrdinaryName); 2903 return LookupName(R, TUScope, false); 2904} 2905 2906static void addFixitForObjCARCConversion(Sema &S, 2907 DiagnosticBuilder &DiagB, 2908 Sema::CheckedConversionKind CCK, 2909 SourceLocation afterLParen, 2910 QualType castType, 2911 Expr *castExpr, 2912 Expr *realCast, 2913 const char *bridgeKeyword, 2914 const char *CFBridgeName) { 2915 // We handle C-style and implicit casts here. 2916 switch (CCK) { 2917 case Sema::CCK_ImplicitConversion: 2918 case Sema::CCK_CStyleCast: 2919 case Sema::CCK_OtherCast: 2920 break; 2921 case Sema::CCK_FunctionalCast: 2922 return; 2923 } 2924 2925 if (CFBridgeName) { 2926 if (CCK == Sema::CCK_OtherCast) { 2927 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) { 2928 SourceRange range(NCE->getOperatorLoc(), 2929 NCE->getAngleBrackets().getEnd()); 2930 SmallString<32> BridgeCall; 2931 2932 SourceManager &SM = S.getSourceManager(); 2933 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1)); 2934 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts())) 2935 BridgeCall += ' '; 2936 2937 BridgeCall += CFBridgeName; 2938 DiagB.AddFixItHint(FixItHint::CreateReplacement(range, BridgeCall)); 2939 } 2940 return; 2941 } 2942 Expr *castedE = castExpr; 2943 if (CStyleCastExpr *CCE = dyn_cast<CStyleCastExpr>(castedE)) 2944 castedE = CCE->getSubExpr(); 2945 castedE = castedE->IgnoreImpCasts(); 2946 SourceRange range = castedE->getSourceRange(); 2947 2948 SmallString<32> BridgeCall; 2949 2950 SourceManager &SM = S.getSourceManager(); 2951 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1)); 2952 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts())) 2953 BridgeCall += ' '; 2954 2955 BridgeCall += CFBridgeName; 2956 2957 if (isa<ParenExpr>(castedE)) { 2958 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(), 2959 BridgeCall)); 2960 } else { 2961 BridgeCall += '('; 2962 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(), 2963 BridgeCall)); 2964 DiagB.AddFixItHint(FixItHint::CreateInsertion( 2965 S.PP.getLocForEndOfToken(range.getEnd()), 2966 ")")); 2967 } 2968 return; 2969 } 2970 2971 if (CCK == Sema::CCK_CStyleCast) { 2972 DiagB.AddFixItHint(FixItHint::CreateInsertion(afterLParen, bridgeKeyword)); 2973 } else if (CCK == Sema::CCK_OtherCast) { 2974 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) { 2975 std::string castCode = "("; 2976 castCode += bridgeKeyword; 2977 castCode += castType.getAsString(); 2978 castCode += ")"; 2979 SourceRange Range(NCE->getOperatorLoc(), 2980 NCE->getAngleBrackets().getEnd()); 2981 DiagB.AddFixItHint(FixItHint::CreateReplacement(Range, castCode)); 2982 } 2983 } else { 2984 std::string castCode = "("; 2985 castCode += bridgeKeyword; 2986 castCode += castType.getAsString(); 2987 castCode += ")"; 2988 Expr *castedE = castExpr->IgnoreImpCasts(); 2989 SourceRange range = castedE->getSourceRange(); 2990 if (isa<ParenExpr>(castedE)) { 2991 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(), 2992 castCode)); 2993 } else { 2994 castCode += "("; 2995 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(), 2996 castCode)); 2997 DiagB.AddFixItHint(FixItHint::CreateInsertion( 2998 S.PP.getLocForEndOfToken(range.getEnd()), 2999 ")")); 3000 } 3001 } 3002} 3003 3004static void 3005diagnoseObjCARCConversion(Sema &S, SourceRange castRange, 3006 QualType castType, ARCConversionTypeClass castACTC, 3007 Expr *castExpr, Expr *realCast, 3008 ARCConversionTypeClass exprACTC, 3009 Sema::CheckedConversionKind CCK) { 3010 SourceLocation loc = 3011 (castRange.isValid() ? castRange.getBegin() : castExpr->getExprLoc()); 3012 3013 if (S.makeUnavailableInSystemHeader(loc, 3014 "converts between Objective-C and C pointers in -fobjc-arc")) 3015 return; 3016 3017 QualType castExprType = castExpr->getType(); 3018 3019 unsigned srcKind = 0; 3020 switch (exprACTC) { 3021 case ACTC_none: 3022 case ACTC_coreFoundation: 3023 case ACTC_voidPtr: 3024 srcKind = (castExprType->isPointerType() ? 1 : 0); 3025 break; 3026 case ACTC_retainable: 3027 srcKind = (castExprType->isBlockPointerType() ? 2 : 3); 3028 break; 3029 case ACTC_indirectRetainable: 3030 srcKind = 4; 3031 break; 3032 } 3033 3034 // Check whether this could be fixed with a bridge cast. 3035 SourceLocation afterLParen = S.PP.getLocForEndOfToken(castRange.getBegin()); 3036 SourceLocation noteLoc = afterLParen.isValid() ? afterLParen : loc; 3037 3038 // Bridge from an ARC type to a CF type. 3039 if (castACTC == ACTC_retainable && isAnyRetainable(exprACTC)) { 3040 3041 S.Diag(loc, diag::err_arc_cast_requires_bridge) 3042 << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit 3043 << 2 // of C pointer type 3044 << castExprType 3045 << unsigned(castType->isBlockPointerType()) // to ObjC|block type 3046 << castType 3047 << castRange 3048 << castExpr->getSourceRange(); 3049 bool br = S.isKnownName("CFBridgingRelease"); 3050 ACCResult CreateRule = 3051 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr); 3052 assert(CreateRule != ACC_bottom && "This cast should already be accepted."); 3053 if (CreateRule != ACC_plusOne) 3054 { 3055 DiagnosticBuilder DiagB = 3056 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge) 3057 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge); 3058 3059 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen, 3060 castType, castExpr, realCast, "__bridge ", 0); 3061 } 3062 if (CreateRule != ACC_plusZero) 3063 { 3064 DiagnosticBuilder DiagB = 3065 (CCK == Sema::CCK_OtherCast && !br) ? 3066 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_transfer) << castExprType : 3067 S.Diag(br ? castExpr->getExprLoc() : noteLoc, 3068 diag::note_arc_bridge_transfer) 3069 << castExprType << br; 3070 3071 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen, 3072 castType, castExpr, realCast, "__bridge_transfer ", 3073 br ? "CFBridgingRelease" : 0); 3074 } 3075 3076 return; 3077 } 3078 3079 // Bridge from a CF type to an ARC type. 3080 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC)) { 3081 bool br = S.isKnownName("CFBridgingRetain"); 3082 S.Diag(loc, diag::err_arc_cast_requires_bridge) 3083 << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit 3084 << unsigned(castExprType->isBlockPointerType()) // of ObjC|block type 3085 << castExprType 3086 << 2 // to C pointer type 3087 << castType 3088 << castRange 3089 << castExpr->getSourceRange(); 3090 ACCResult CreateRule = 3091 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr); 3092 assert(CreateRule != ACC_bottom && "This cast should already be accepted."); 3093 if (CreateRule != ACC_plusOne) 3094 { 3095 DiagnosticBuilder DiagB = 3096 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge) 3097 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge); 3098 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen, 3099 castType, castExpr, realCast, "__bridge ", 0); 3100 } 3101 if (CreateRule != ACC_plusZero) 3102 { 3103 DiagnosticBuilder DiagB = 3104 (CCK == Sema::CCK_OtherCast && !br) ? 3105 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_retained) << castType : 3106 S.Diag(br ? castExpr->getExprLoc() : noteLoc, 3107 diag::note_arc_bridge_retained) 3108 << castType << br; 3109 3110 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen, 3111 castType, castExpr, realCast, "__bridge_retained ", 3112 br ? "CFBridgingRetain" : 0); 3113 } 3114 3115 return; 3116 } 3117 3118 S.Diag(loc, diag::err_arc_mismatched_cast) 3119 << (CCK != Sema::CCK_ImplicitConversion) 3120 << srcKind << castExprType << castType 3121 << castRange << castExpr->getSourceRange(); 3122} 3123 3124Sema::ARCConversionResult 3125Sema::CheckObjCARCConversion(SourceRange castRange, QualType castType, 3126 Expr *&castExpr, CheckedConversionKind CCK) { 3127 QualType castExprType = castExpr->getType(); 3128 3129 // For the purposes of the classification, we assume reference types 3130 // will bind to temporaries. 3131 QualType effCastType = castType; 3132 if (const ReferenceType *ref = castType->getAs<ReferenceType>()) 3133 effCastType = ref->getPointeeType(); 3134 3135 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExprType); 3136 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(effCastType); 3137 if (exprACTC == castACTC) { 3138 // check for viablity and report error if casting an rvalue to a 3139 // life-time qualifier. 3140 if ((castACTC == ACTC_retainable) && 3141 (CCK == CCK_CStyleCast || CCK == CCK_OtherCast) && 3142 (castType != castExprType)) { 3143 const Type *DT = castType.getTypePtr(); 3144 QualType QDT = castType; 3145 // We desugar some types but not others. We ignore those 3146 // that cannot happen in a cast; i.e. auto, and those which 3147 // should not be de-sugared; i.e typedef. 3148 if (const ParenType *PT = dyn_cast<ParenType>(DT)) 3149 QDT = PT->desugar(); 3150 else if (const TypeOfType *TP = dyn_cast<TypeOfType>(DT)) 3151 QDT = TP->desugar(); 3152 else if (const AttributedType *AT = dyn_cast<AttributedType>(DT)) 3153 QDT = AT->desugar(); 3154 if (QDT != castType && 3155 QDT.getObjCLifetime() != Qualifiers::OCL_None) { 3156 SourceLocation loc = 3157 (castRange.isValid() ? castRange.getBegin() 3158 : castExpr->getExprLoc()); 3159 Diag(loc, diag::err_arc_nolifetime_behavior); 3160 } 3161 } 3162 return ACR_okay; 3163 } 3164 3165 if (isAnyCLike(exprACTC) && isAnyCLike(castACTC)) return ACR_okay; 3166 3167 // Allow all of these types to be cast to integer types (but not 3168 // vice-versa). 3169 if (castACTC == ACTC_none && castType->isIntegralType(Context)) 3170 return ACR_okay; 3171 3172 // Allow casts between pointers to lifetime types (e.g., __strong id*) 3173 // and pointers to void (e.g., cv void *). Casting from void* to lifetime* 3174 // must be explicit. 3175 if (exprACTC == ACTC_indirectRetainable && castACTC == ACTC_voidPtr) 3176 return ACR_okay; 3177 if (castACTC == ACTC_indirectRetainable && exprACTC == ACTC_voidPtr && 3178 CCK != CCK_ImplicitConversion) 3179 return ACR_okay; 3180 3181 switch (ARCCastChecker(Context, exprACTC, castACTC, false).Visit(castExpr)) { 3182 // For invalid casts, fall through. 3183 case ACC_invalid: 3184 break; 3185 3186 // Do nothing for both bottom and +0. 3187 case ACC_bottom: 3188 case ACC_plusZero: 3189 return ACR_okay; 3190 3191 // If the result is +1, consume it here. 3192 case ACC_plusOne: 3193 castExpr = ImplicitCastExpr::Create(Context, castExpr->getType(), 3194 CK_ARCConsumeObject, castExpr, 3195 0, VK_RValue); 3196 ExprNeedsCleanups = true; 3197 return ACR_okay; 3198 } 3199 3200 // If this is a non-implicit cast from id or block type to a 3201 // CoreFoundation type, delay complaining in case the cast is used 3202 // in an acceptable context. 3203 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC) && 3204 CCK != CCK_ImplicitConversion) 3205 return ACR_unbridged; 3206 3207 diagnoseObjCARCConversion(*this, castRange, castType, castACTC, 3208 castExpr, castExpr, exprACTC, CCK); 3209 return ACR_okay; 3210} 3211 3212/// Given that we saw an expression with the ARCUnbridgedCastTy 3213/// placeholder type, complain bitterly. 3214void Sema::diagnoseARCUnbridgedCast(Expr *e) { 3215 // We expect the spurious ImplicitCastExpr to already have been stripped. 3216 assert(!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)); 3217 CastExpr *realCast = cast<CastExpr>(e->IgnoreParens()); 3218 3219 SourceRange castRange; 3220 QualType castType; 3221 CheckedConversionKind CCK; 3222 3223 if (CStyleCastExpr *cast = dyn_cast<CStyleCastExpr>(realCast)) { 3224 castRange = SourceRange(cast->getLParenLoc(), cast->getRParenLoc()); 3225 castType = cast->getTypeAsWritten(); 3226 CCK = CCK_CStyleCast; 3227 } else if (ExplicitCastExpr *cast = dyn_cast<ExplicitCastExpr>(realCast)) { 3228 castRange = cast->getTypeInfoAsWritten()->getTypeLoc().getSourceRange(); 3229 castType = cast->getTypeAsWritten(); 3230 CCK = CCK_OtherCast; 3231 } else { 3232 castType = cast->getType(); 3233 CCK = CCK_ImplicitConversion; 3234 } 3235 3236 ARCConversionTypeClass castACTC = 3237 classifyTypeForARCConversion(castType.getNonReferenceType()); 3238 3239 Expr *castExpr = realCast->getSubExpr(); 3240 assert(classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable); 3241 3242 diagnoseObjCARCConversion(*this, castRange, castType, castACTC, 3243 castExpr, realCast, ACTC_retainable, CCK); 3244} 3245 3246/// stripARCUnbridgedCast - Given an expression of ARCUnbridgedCast 3247/// type, remove the placeholder cast. 3248Expr *Sema::stripARCUnbridgedCast(Expr *e) { 3249 assert(e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)); 3250 3251 if (ParenExpr *pe = dyn_cast<ParenExpr>(e)) { 3252 Expr *sub = stripARCUnbridgedCast(pe->getSubExpr()); 3253 return new (Context) ParenExpr(pe->getLParen(), pe->getRParen(), sub); 3254 } else if (UnaryOperator *uo = dyn_cast<UnaryOperator>(e)) { 3255 assert(uo->getOpcode() == UO_Extension); 3256 Expr *sub = stripARCUnbridgedCast(uo->getSubExpr()); 3257 return new (Context) UnaryOperator(sub, UO_Extension, sub->getType(), 3258 sub->getValueKind(), sub->getObjectKind(), 3259 uo->getOperatorLoc()); 3260 } else if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) { 3261 assert(!gse->isResultDependent()); 3262 3263 unsigned n = gse->getNumAssocs(); 3264 SmallVector<Expr*, 4> subExprs(n); 3265 SmallVector<TypeSourceInfo*, 4> subTypes(n); 3266 for (unsigned i = 0; i != n; ++i) { 3267 subTypes[i] = gse->getAssocTypeSourceInfo(i); 3268 Expr *sub = gse->getAssocExpr(i); 3269 if (i == gse->getResultIndex()) 3270 sub = stripARCUnbridgedCast(sub); 3271 subExprs[i] = sub; 3272 } 3273 3274 return new (Context) GenericSelectionExpr(Context, gse->getGenericLoc(), 3275 gse->getControllingExpr(), 3276 subTypes, subExprs, 3277 gse->getDefaultLoc(), 3278 gse->getRParenLoc(), 3279 gse->containsUnexpandedParameterPack(), 3280 gse->getResultIndex()); 3281 } else { 3282 assert(isa<ImplicitCastExpr>(e) && "bad form of unbridged cast!"); 3283 return cast<ImplicitCastExpr>(e)->getSubExpr(); 3284 } 3285} 3286 3287bool Sema::CheckObjCARCUnavailableWeakConversion(QualType castType, 3288 QualType exprType) { 3289 QualType canCastType = 3290 Context.getCanonicalType(castType).getUnqualifiedType(); 3291 QualType canExprType = 3292 Context.getCanonicalType(exprType).getUnqualifiedType(); 3293 if (isa<ObjCObjectPointerType>(canCastType) && 3294 castType.getObjCLifetime() == Qualifiers::OCL_Weak && 3295 canExprType->isObjCObjectPointerType()) { 3296 if (const ObjCObjectPointerType *ObjT = 3297 canExprType->getAs<ObjCObjectPointerType>()) 3298 if (const ObjCInterfaceDecl *ObjI = ObjT->getInterfaceDecl()) 3299 return !ObjI->isArcWeakrefUnavailable(); 3300 } 3301 return true; 3302} 3303 3304/// Look for an ObjCReclaimReturnedObject cast and destroy it. 3305static Expr *maybeUndoReclaimObject(Expr *e) { 3306 // For now, we just undo operands that are *immediately* reclaim 3307 // expressions, which prevents the vast majority of potential 3308 // problems here. To catch them all, we'd need to rebuild arbitrary 3309 // value-propagating subexpressions --- we can't reliably rebuild 3310 // in-place because of expression sharing. 3311 if (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 3312 if (ice->getCastKind() == CK_ARCReclaimReturnedObject) 3313 return ice->getSubExpr(); 3314 3315 return e; 3316} 3317 3318ExprResult Sema::BuildObjCBridgedCast(SourceLocation LParenLoc, 3319 ObjCBridgeCastKind Kind, 3320 SourceLocation BridgeKeywordLoc, 3321 TypeSourceInfo *TSInfo, 3322 Expr *SubExpr) { 3323 ExprResult SubResult = UsualUnaryConversions(SubExpr); 3324 if (SubResult.isInvalid()) return ExprError(); 3325 SubExpr = SubResult.take(); 3326 3327 QualType T = TSInfo->getType(); 3328 QualType FromType = SubExpr->getType(); 3329 3330 CastKind CK; 3331 3332 bool MustConsume = false; 3333 if (T->isDependentType() || SubExpr->isTypeDependent()) { 3334 // Okay: we'll build a dependent expression type. 3335 CK = CK_Dependent; 3336 } else if (T->isObjCARCBridgableType() && FromType->isCARCBridgableType()) { 3337 // Casting CF -> id 3338 CK = (T->isBlockPointerType() ? CK_AnyPointerToBlockPointerCast 3339 : CK_CPointerToObjCPointerCast); 3340 switch (Kind) { 3341 case OBC_Bridge: 3342 break; 3343 3344 case OBC_BridgeRetained: { 3345 bool br = isKnownName("CFBridgingRelease"); 3346 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind) 3347 << 2 3348 << FromType 3349 << (T->isBlockPointerType()? 1 : 0) 3350 << T 3351 << SubExpr->getSourceRange() 3352 << Kind; 3353 Diag(BridgeKeywordLoc, diag::note_arc_bridge) 3354 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge"); 3355 Diag(BridgeKeywordLoc, diag::note_arc_bridge_transfer) 3356 << FromType << br 3357 << FixItHint::CreateReplacement(BridgeKeywordLoc, 3358 br ? "CFBridgingRelease " 3359 : "__bridge_transfer "); 3360 3361 Kind = OBC_Bridge; 3362 break; 3363 } 3364 3365 case OBC_BridgeTransfer: 3366 // We must consume the Objective-C object produced by the cast. 3367 MustConsume = true; 3368 break; 3369 } 3370 } else if (T->isCARCBridgableType() && FromType->isObjCARCBridgableType()) { 3371 // Okay: id -> CF 3372 CK = CK_BitCast; 3373 switch (Kind) { 3374 case OBC_Bridge: 3375 // Reclaiming a value that's going to be __bridge-casted to CF 3376 // is very dangerous, so we don't do it. 3377 SubExpr = maybeUndoReclaimObject(SubExpr); 3378 break; 3379 3380 case OBC_BridgeRetained: 3381 // Produce the object before casting it. 3382 SubExpr = ImplicitCastExpr::Create(Context, FromType, 3383 CK_ARCProduceObject, 3384 SubExpr, 0, VK_RValue); 3385 break; 3386 3387 case OBC_BridgeTransfer: { 3388 bool br = isKnownName("CFBridgingRetain"); 3389 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind) 3390 << (FromType->isBlockPointerType()? 1 : 0) 3391 << FromType 3392 << 2 3393 << T 3394 << SubExpr->getSourceRange() 3395 << Kind; 3396 3397 Diag(BridgeKeywordLoc, diag::note_arc_bridge) 3398 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge "); 3399 Diag(BridgeKeywordLoc, diag::note_arc_bridge_retained) 3400 << T << br 3401 << FixItHint::CreateReplacement(BridgeKeywordLoc, 3402 br ? "CFBridgingRetain " : "__bridge_retained"); 3403 3404 Kind = OBC_Bridge; 3405 break; 3406 } 3407 } 3408 } else { 3409 Diag(LParenLoc, diag::err_arc_bridge_cast_incompatible) 3410 << FromType << T << Kind 3411 << SubExpr->getSourceRange() 3412 << TSInfo->getTypeLoc().getSourceRange(); 3413 return ExprError(); 3414 } 3415 3416 Expr *Result = new (Context) ObjCBridgedCastExpr(LParenLoc, Kind, CK, 3417 BridgeKeywordLoc, 3418 TSInfo, SubExpr); 3419 3420 if (MustConsume) { 3421 ExprNeedsCleanups = true; 3422 Result = ImplicitCastExpr::Create(Context, T, CK_ARCConsumeObject, Result, 3423 0, VK_RValue); 3424 } 3425 3426 return Result; 3427} 3428 3429ExprResult Sema::ActOnObjCBridgedCast(Scope *S, 3430 SourceLocation LParenLoc, 3431 ObjCBridgeCastKind Kind, 3432 SourceLocation BridgeKeywordLoc, 3433 ParsedType Type, 3434 SourceLocation RParenLoc, 3435 Expr *SubExpr) { 3436 TypeSourceInfo *TSInfo = 0; 3437 QualType T = GetTypeFromParser(Type, &TSInfo); 3438 if (!TSInfo) 3439 TSInfo = Context.getTrivialTypeSourceInfo(T, LParenLoc); 3440 return BuildObjCBridgedCast(LParenLoc, Kind, BridgeKeywordLoc, TSInfo, 3441 SubExpr); 3442} 3443