SemaExprObjC.cpp revision d2615cc53b916e8aae45783ca7113b93de515ce3
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, ArrayRef<SourceLocation>()); 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, 1); 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, ArrayRef<SourceLocation>()); 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, ArrayRef<SourceLocation>()); 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, ArrayRef<SourceLocation>()); 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 if (!Method) { 1195 // Apply default argument promotion as for (C99 6.5.2.2p6). 1196 for (unsigned i = 0; i != NumArgs; i++) { 1197 if (Args[i]->isTypeDependent()) 1198 continue; 1199 1200 ExprResult result; 1201 if (getLangOpts().DebuggerSupport) { 1202 QualType paramTy; // ignored 1203 result = checkUnknownAnyArg(lbrac, Args[i], paramTy); 1204 } else { 1205 result = DefaultArgumentPromotion(Args[i]); 1206 } 1207 if (result.isInvalid()) 1208 return true; 1209 Args[i] = result.take(); 1210 } 1211 1212 unsigned DiagID; 1213 if (getLangOpts().ObjCAutoRefCount) 1214 DiagID = diag::err_arc_method_not_found; 1215 else 1216 DiagID = isClassMessage ? diag::warn_class_method_not_found 1217 : diag::warn_inst_method_not_found; 1218 if (!getLangOpts().DebuggerSupport) 1219 Diag(lbrac, DiagID) 1220 << Sel << isClassMessage << SourceRange(SelectorLocs.front(), 1221 SelectorLocs.back()); 1222 1223 // In debuggers, we want to use __unknown_anytype for these 1224 // results so that clients can cast them. 1225 if (getLangOpts().DebuggerSupport) { 1226 ReturnType = Context.UnknownAnyTy; 1227 } else { 1228 ReturnType = Context.getObjCIdType(); 1229 } 1230 VK = VK_RValue; 1231 return false; 1232 } 1233 1234 ReturnType = getMessageSendResultType(ReceiverType, Method, isClassMessage, 1235 isSuperMessage); 1236 VK = Expr::getValueKindForType(Method->getResultType()); 1237 1238 unsigned NumNamedArgs = Sel.getNumArgs(); 1239 // Method might have more arguments than selector indicates. This is due 1240 // to addition of c-style arguments in method. 1241 if (Method->param_size() > Sel.getNumArgs()) 1242 NumNamedArgs = Method->param_size(); 1243 // FIXME. This need be cleaned up. 1244 if (NumArgs < NumNamedArgs) { 1245 Diag(lbrac, diag::err_typecheck_call_too_few_args) 1246 << 2 << NumNamedArgs << NumArgs; 1247 return false; 1248 } 1249 1250 bool IsError = false; 1251 for (unsigned i = 0; i < NumNamedArgs; i++) { 1252 // We can't do any type-checking on a type-dependent argument. 1253 if (Args[i]->isTypeDependent()) 1254 continue; 1255 1256 Expr *argExpr = Args[i]; 1257 1258 ParmVarDecl *param = Method->param_begin()[i]; 1259 assert(argExpr && "CheckMessageArgumentTypes(): missing expression"); 1260 1261 // Strip the unbridged-cast placeholder expression off unless it's 1262 // a consumed argument. 1263 if (argExpr->hasPlaceholderType(BuiltinType::ARCUnbridgedCast) && 1264 !param->hasAttr<CFConsumedAttr>()) 1265 argExpr = stripARCUnbridgedCast(argExpr); 1266 1267 // If the parameter is __unknown_anytype, infer its type 1268 // from the argument. 1269 if (param->getType() == Context.UnknownAnyTy) { 1270 QualType paramType; 1271 ExprResult argE = checkUnknownAnyArg(lbrac, argExpr, paramType); 1272 if (argE.isInvalid()) { 1273 IsError = true; 1274 } else { 1275 Args[i] = argE.take(); 1276 1277 // Update the parameter type in-place. 1278 param->setType(paramType); 1279 } 1280 continue; 1281 } 1282 1283 if (RequireCompleteType(argExpr->getSourceRange().getBegin(), 1284 param->getType(), 1285 diag::err_call_incomplete_argument, argExpr)) 1286 return true; 1287 1288 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 1289 param); 1290 ExprResult ArgE = PerformCopyInitialization(Entity, lbrac, Owned(argExpr)); 1291 if (ArgE.isInvalid()) 1292 IsError = true; 1293 else 1294 Args[i] = ArgE.takeAs<Expr>(); 1295 } 1296 1297 // Promote additional arguments to variadic methods. 1298 if (Method->isVariadic()) { 1299 for (unsigned i = NumNamedArgs; i < NumArgs; ++i) { 1300 if (Args[i]->isTypeDependent()) 1301 continue; 1302 1303 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod, 1304 0); 1305 IsError |= Arg.isInvalid(); 1306 Args[i] = Arg.take(); 1307 } 1308 } else { 1309 // Check for extra arguments to non-variadic methods. 1310 if (NumArgs != NumNamedArgs) { 1311 Diag(Args[NumNamedArgs]->getLocStart(), 1312 diag::err_typecheck_call_too_many_args) 1313 << 2 /*method*/ << NumNamedArgs << NumArgs 1314 << Method->getSourceRange() 1315 << SourceRange(Args[NumNamedArgs]->getLocStart(), 1316 Args[NumArgs-1]->getLocEnd()); 1317 } 1318 } 1319 1320 DiagnoseSentinelCalls(Method, lbrac, Args, NumArgs); 1321 1322 // Do additional checkings on method. 1323 IsError |= CheckObjCMethodCall(Method, lbrac, Args, NumArgs); 1324 1325 return IsError; 1326} 1327 1328bool Sema::isSelfExpr(Expr *receiver) { 1329 // 'self' is objc 'self' in an objc method only. 1330 ObjCMethodDecl *method = 1331 dyn_cast<ObjCMethodDecl>(CurContext->getNonClosureAncestor()); 1332 if (!method) return false; 1333 1334 receiver = receiver->IgnoreParenLValueCasts(); 1335 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(receiver)) 1336 if (DRE->getDecl() == method->getSelfDecl()) 1337 return true; 1338 return false; 1339} 1340 1341/// LookupMethodInType - Look up a method in an ObjCObjectType. 1342ObjCMethodDecl *Sema::LookupMethodInObjectType(Selector sel, QualType type, 1343 bool isInstance) { 1344 const ObjCObjectType *objType = type->castAs<ObjCObjectType>(); 1345 if (ObjCInterfaceDecl *iface = objType->getInterface()) { 1346 // Look it up in the main interface (and categories, etc.) 1347 if (ObjCMethodDecl *method = iface->lookupMethod(sel, isInstance)) 1348 return method; 1349 1350 // Okay, look for "private" methods declared in any 1351 // @implementations we've seen. 1352 if (ObjCMethodDecl *method = iface->lookupPrivateMethod(sel, isInstance)) 1353 return method; 1354 } 1355 1356 // Check qualifiers. 1357 for (ObjCObjectType::qual_iterator 1358 i = objType->qual_begin(), e = objType->qual_end(); i != e; ++i) 1359 if (ObjCMethodDecl *method = (*i)->lookupMethod(sel, isInstance)) 1360 return method; 1361 1362 return 0; 1363} 1364 1365/// LookupMethodInQualifiedType - Lookups up a method in protocol qualifier 1366/// list of a qualified objective pointer type. 1367ObjCMethodDecl *Sema::LookupMethodInQualifiedType(Selector Sel, 1368 const ObjCObjectPointerType *OPT, 1369 bool Instance) 1370{ 1371 ObjCMethodDecl *MD = 0; 1372 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 1373 E = OPT->qual_end(); I != E; ++I) { 1374 ObjCProtocolDecl *PROTO = (*I); 1375 if ((MD = PROTO->lookupMethod(Sel, Instance))) { 1376 return MD; 1377 } 1378 } 1379 return 0; 1380} 1381 1382static void DiagnoseARCUseOfWeakReceiver(Sema &S, Expr *Receiver) { 1383 if (!Receiver) 1384 return; 1385 1386 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(Receiver)) 1387 Receiver = OVE->getSourceExpr(); 1388 1389 Expr *RExpr = Receiver->IgnoreParenImpCasts(); 1390 SourceLocation Loc = RExpr->getLocStart(); 1391 QualType T = RExpr->getType(); 1392 const ObjCPropertyDecl *PDecl = 0; 1393 const ObjCMethodDecl *GDecl = 0; 1394 if (PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(RExpr)) { 1395 RExpr = POE->getSyntacticForm(); 1396 if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(RExpr)) { 1397 if (PRE->isImplicitProperty()) { 1398 GDecl = PRE->getImplicitPropertyGetter(); 1399 if (GDecl) { 1400 T = GDecl->getResultType(); 1401 } 1402 } 1403 else { 1404 PDecl = PRE->getExplicitProperty(); 1405 if (PDecl) { 1406 T = PDecl->getType(); 1407 } 1408 } 1409 } 1410 } 1411 else if (ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(RExpr)) { 1412 // See if receiver is a method which envokes a synthesized getter 1413 // backing a 'weak' property. 1414 ObjCMethodDecl *Method = ME->getMethodDecl(); 1415 if (Method && Method->getSelector().getNumArgs() == 0) { 1416 PDecl = Method->findPropertyDecl(); 1417 if (PDecl) 1418 T = PDecl->getType(); 1419 } 1420 } 1421 1422 if (T.getObjCLifetime() != Qualifiers::OCL_Weak) { 1423 if (!PDecl) 1424 return; 1425 if (!(PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak)) 1426 return; 1427 } 1428 1429 S.Diag(Loc, diag::warn_receiver_is_weak) 1430 << ((!PDecl && !GDecl) ? 0 : (PDecl ? 1 : 2)); 1431 1432 if (PDecl) 1433 S.Diag(PDecl->getLocation(), diag::note_property_declare); 1434 else if (GDecl) 1435 S.Diag(GDecl->getLocation(), diag::note_method_declared_at) << GDecl; 1436 1437 S.Diag(Loc, diag::note_arc_assign_to_strong); 1438} 1439 1440/// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an 1441/// objective C interface. This is a property reference expression. 1442ExprResult Sema:: 1443HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT, 1444 Expr *BaseExpr, SourceLocation OpLoc, 1445 DeclarationName MemberName, 1446 SourceLocation MemberLoc, 1447 SourceLocation SuperLoc, QualType SuperType, 1448 bool Super) { 1449 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType(); 1450 ObjCInterfaceDecl *IFace = IFaceT->getDecl(); 1451 1452 if (!MemberName.isIdentifier()) { 1453 Diag(MemberLoc, diag::err_invalid_property_name) 1454 << MemberName << QualType(OPT, 0); 1455 return ExprError(); 1456 } 1457 1458 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 1459 1460 SourceRange BaseRange = Super? SourceRange(SuperLoc) 1461 : BaseExpr->getSourceRange(); 1462 if (RequireCompleteType(MemberLoc, OPT->getPointeeType(), 1463 diag::err_property_not_found_forward_class, 1464 MemberName, BaseRange)) 1465 return ExprError(); 1466 1467 // Search for a declared property first. 1468 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Member)) { 1469 // Check whether we can reference this property. 1470 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1471 return ExprError(); 1472 if (Super) 1473 return Owned(new (Context) ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, 1474 VK_LValue, OK_ObjCProperty, 1475 MemberLoc, 1476 SuperLoc, SuperType)); 1477 else 1478 return Owned(new (Context) ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, 1479 VK_LValue, OK_ObjCProperty, 1480 MemberLoc, BaseExpr)); 1481 } 1482 // Check protocols on qualified interfaces. 1483 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 1484 E = OPT->qual_end(); I != E; ++I) 1485 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 1486 // Check whether we can reference this property. 1487 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1488 return ExprError(); 1489 1490 if (Super) 1491 return Owned(new (Context) ObjCPropertyRefExpr(PD, 1492 Context.PseudoObjectTy, 1493 VK_LValue, 1494 OK_ObjCProperty, 1495 MemberLoc, 1496 SuperLoc, SuperType)); 1497 else 1498 return Owned(new (Context) ObjCPropertyRefExpr(PD, 1499 Context.PseudoObjectTy, 1500 VK_LValue, 1501 OK_ObjCProperty, 1502 MemberLoc, 1503 BaseExpr)); 1504 } 1505 // If that failed, look for an "implicit" property by seeing if the nullary 1506 // selector is implemented. 1507 1508 // FIXME: The logic for looking up nullary and unary selectors should be 1509 // shared with the code in ActOnInstanceMessage. 1510 1511 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 1512 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 1513 1514 // May be founf in property's qualified list. 1515 if (!Getter) 1516 Getter = LookupMethodInQualifiedType(Sel, OPT, true); 1517 1518 // If this reference is in an @implementation, check for 'private' methods. 1519 if (!Getter) 1520 Getter = IFace->lookupPrivateMethod(Sel); 1521 1522 if (Getter) { 1523 // Check if we can reference this property. 1524 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 1525 return ExprError(); 1526 } 1527 // If we found a getter then this may be a valid dot-reference, we 1528 // will look for the matching setter, in case it is needed. 1529 Selector SetterSel = 1530 SelectorTable::constructSetterName(PP.getIdentifierTable(), 1531 PP.getSelectorTable(), Member); 1532 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 1533 1534 // May be founf in property's qualified list. 1535 if (!Setter) 1536 Setter = LookupMethodInQualifiedType(SetterSel, OPT, true); 1537 1538 if (!Setter) { 1539 // If this reference is in an @implementation, also check for 'private' 1540 // methods. 1541 Setter = IFace->lookupPrivateMethod(SetterSel); 1542 } 1543 1544 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 1545 return ExprError(); 1546 1547 if (Getter || Setter) { 1548 if (Super) 1549 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter, 1550 Context.PseudoObjectTy, 1551 VK_LValue, OK_ObjCProperty, 1552 MemberLoc, 1553 SuperLoc, SuperType)); 1554 else 1555 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter, 1556 Context.PseudoObjectTy, 1557 VK_LValue, OK_ObjCProperty, 1558 MemberLoc, BaseExpr)); 1559 1560 } 1561 1562 // Attempt to correct for typos in property names. 1563 DeclFilterCCC<ObjCPropertyDecl> Validator; 1564 if (TypoCorrection Corrected = CorrectTypo( 1565 DeclarationNameInfo(MemberName, MemberLoc), LookupOrdinaryName, NULL, 1566 NULL, Validator, IFace, false, OPT)) { 1567 ObjCPropertyDecl *Property = 1568 Corrected.getCorrectionDeclAs<ObjCPropertyDecl>(); 1569 DeclarationName TypoResult = Corrected.getCorrection(); 1570 Diag(MemberLoc, diag::err_property_not_found_suggest) 1571 << MemberName << QualType(OPT, 0) << TypoResult 1572 << FixItHint::CreateReplacement(MemberLoc, TypoResult.getAsString()); 1573 Diag(Property->getLocation(), diag::note_previous_decl) 1574 << Property->getDeclName(); 1575 return HandleExprPropertyRefExpr(OPT, BaseExpr, OpLoc, 1576 TypoResult, MemberLoc, 1577 SuperLoc, SuperType, Super); 1578 } 1579 ObjCInterfaceDecl *ClassDeclared; 1580 if (ObjCIvarDecl *Ivar = 1581 IFace->lookupInstanceVariable(Member, ClassDeclared)) { 1582 QualType T = Ivar->getType(); 1583 if (const ObjCObjectPointerType * OBJPT = 1584 T->getAsObjCInterfacePointerType()) { 1585 if (RequireCompleteType(MemberLoc, OBJPT->getPointeeType(), 1586 diag::err_property_not_as_forward_class, 1587 MemberName, BaseExpr)) 1588 return ExprError(); 1589 } 1590 Diag(MemberLoc, 1591 diag::err_ivar_access_using_property_syntax_suggest) 1592 << MemberName << QualType(OPT, 0) << Ivar->getDeclName() 1593 << FixItHint::CreateReplacement(OpLoc, "->"); 1594 return ExprError(); 1595 } 1596 1597 Diag(MemberLoc, diag::err_property_not_found) 1598 << MemberName << QualType(OPT, 0); 1599 if (Setter) 1600 Diag(Setter->getLocation(), diag::note_getter_unavailable) 1601 << MemberName << BaseExpr->getSourceRange(); 1602 return ExprError(); 1603} 1604 1605 1606 1607ExprResult Sema:: 1608ActOnClassPropertyRefExpr(IdentifierInfo &receiverName, 1609 IdentifierInfo &propertyName, 1610 SourceLocation receiverNameLoc, 1611 SourceLocation propertyNameLoc) { 1612 1613 IdentifierInfo *receiverNamePtr = &receiverName; 1614 ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr, 1615 receiverNameLoc); 1616 1617 bool IsSuper = false; 1618 if (IFace == 0) { 1619 // If the "receiver" is 'super' in a method, handle it as an expression-like 1620 // property reference. 1621 if (receiverNamePtr->isStr("super")) { 1622 IsSuper = true; 1623 1624 if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf(receiverNameLoc)) { 1625 if (CurMethod->isInstanceMethod()) { 1626 ObjCInterfaceDecl *Super = 1627 CurMethod->getClassInterface()->getSuperClass(); 1628 if (!Super) { 1629 // The current class does not have a superclass. 1630 Diag(receiverNameLoc, diag::error_root_class_cannot_use_super) 1631 << CurMethod->getClassInterface()->getIdentifier(); 1632 return ExprError(); 1633 } 1634 QualType T = Context.getObjCInterfaceType(Super); 1635 T = Context.getObjCObjectPointerType(T); 1636 1637 return HandleExprPropertyRefExpr(T->getAsObjCInterfacePointerType(), 1638 /*BaseExpr*/0, 1639 SourceLocation()/*OpLoc*/, 1640 &propertyName, 1641 propertyNameLoc, 1642 receiverNameLoc, T, true); 1643 } 1644 1645 // Otherwise, if this is a class method, try dispatching to our 1646 // superclass. 1647 IFace = CurMethod->getClassInterface()->getSuperClass(); 1648 } 1649 } 1650 1651 if (IFace == 0) { 1652 Diag(receiverNameLoc, diag::err_expected_ident_or_lparen); 1653 return ExprError(); 1654 } 1655 } 1656 1657 // Search for a declared property first. 1658 Selector Sel = PP.getSelectorTable().getNullarySelector(&propertyName); 1659 ObjCMethodDecl *Getter = IFace->lookupClassMethod(Sel); 1660 1661 // If this reference is in an @implementation, check for 'private' methods. 1662 if (!Getter) 1663 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1664 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1665 if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation()) 1666 Getter = ImpDecl->getClassMethod(Sel); 1667 1668 if (Getter) { 1669 // FIXME: refactor/share with ActOnMemberReference(). 1670 // Check if we can reference this property. 1671 if (DiagnoseUseOfDecl(Getter, propertyNameLoc)) 1672 return ExprError(); 1673 } 1674 1675 // Look for the matching setter, in case it is needed. 1676 Selector SetterSel = 1677 SelectorTable::constructSetterName(PP.getIdentifierTable(), 1678 PP.getSelectorTable(), &propertyName); 1679 1680 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); 1681 if (!Setter) { 1682 // If this reference is in an @implementation, also check for 'private' 1683 // methods. 1684 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1685 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1686 if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation()) 1687 Setter = ImpDecl->getClassMethod(SetterSel); 1688 } 1689 // Look through local category implementations associated with the class. 1690 if (!Setter) 1691 Setter = IFace->getCategoryClassMethod(SetterSel); 1692 1693 if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc)) 1694 return ExprError(); 1695 1696 if (Getter || Setter) { 1697 if (IsSuper) 1698 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter, 1699 Context.PseudoObjectTy, 1700 VK_LValue, OK_ObjCProperty, 1701 propertyNameLoc, 1702 receiverNameLoc, 1703 Context.getObjCInterfaceType(IFace))); 1704 1705 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter, 1706 Context.PseudoObjectTy, 1707 VK_LValue, OK_ObjCProperty, 1708 propertyNameLoc, 1709 receiverNameLoc, IFace)); 1710 } 1711 return ExprError(Diag(propertyNameLoc, diag::err_property_not_found) 1712 << &propertyName << Context.getObjCInterfaceType(IFace)); 1713} 1714 1715namespace { 1716 1717class ObjCInterfaceOrSuperCCC : public CorrectionCandidateCallback { 1718 public: 1719 ObjCInterfaceOrSuperCCC(ObjCMethodDecl *Method) { 1720 // Determine whether "super" is acceptable in the current context. 1721 if (Method && Method->getClassInterface()) 1722 WantObjCSuper = Method->getClassInterface()->getSuperClass(); 1723 } 1724 1725 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1726 return candidate.getCorrectionDeclAs<ObjCInterfaceDecl>() || 1727 candidate.isKeyword("super"); 1728 } 1729}; 1730 1731} 1732 1733Sema::ObjCMessageKind Sema::getObjCMessageKind(Scope *S, 1734 IdentifierInfo *Name, 1735 SourceLocation NameLoc, 1736 bool IsSuper, 1737 bool HasTrailingDot, 1738 ParsedType &ReceiverType) { 1739 ReceiverType = ParsedType(); 1740 1741 // If the identifier is "super" and there is no trailing dot, we're 1742 // messaging super. If the identifier is "super" and there is a 1743 // trailing dot, it's an instance message. 1744 if (IsSuper && S->isInObjcMethodScope()) 1745 return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage; 1746 1747 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 1748 LookupName(Result, S); 1749 1750 switch (Result.getResultKind()) { 1751 case LookupResult::NotFound: 1752 // Normal name lookup didn't find anything. If we're in an 1753 // Objective-C method, look for ivars. If we find one, we're done! 1754 // FIXME: This is a hack. Ivar lookup should be part of normal 1755 // lookup. 1756 if (ObjCMethodDecl *Method = getCurMethodDecl()) { 1757 if (!Method->getClassInterface()) { 1758 // Fall back: let the parser try to parse it as an instance message. 1759 return ObjCInstanceMessage; 1760 } 1761 1762 ObjCInterfaceDecl *ClassDeclared; 1763 if (Method->getClassInterface()->lookupInstanceVariable(Name, 1764 ClassDeclared)) 1765 return ObjCInstanceMessage; 1766 } 1767 1768 // Break out; we'll perform typo correction below. 1769 break; 1770 1771 case LookupResult::NotFoundInCurrentInstantiation: 1772 case LookupResult::FoundOverloaded: 1773 case LookupResult::FoundUnresolvedValue: 1774 case LookupResult::Ambiguous: 1775 Result.suppressDiagnostics(); 1776 return ObjCInstanceMessage; 1777 1778 case LookupResult::Found: { 1779 // If the identifier is a class or not, and there is a trailing dot, 1780 // it's an instance message. 1781 if (HasTrailingDot) 1782 return ObjCInstanceMessage; 1783 // We found something. If it's a type, then we have a class 1784 // message. Otherwise, it's an instance message. 1785 NamedDecl *ND = Result.getFoundDecl(); 1786 QualType T; 1787 if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND)) 1788 T = Context.getObjCInterfaceType(Class); 1789 else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND)) 1790 T = Context.getTypeDeclType(Type); 1791 else 1792 return ObjCInstanceMessage; 1793 1794 // We have a class message, and T is the type we're 1795 // messaging. Build source-location information for it. 1796 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc); 1797 ReceiverType = CreateParsedType(T, TSInfo); 1798 return ObjCClassMessage; 1799 } 1800 } 1801 1802 ObjCInterfaceOrSuperCCC Validator(getCurMethodDecl()); 1803 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 1804 Result.getLookupKind(), S, NULL, 1805 Validator)) { 1806 if (Corrected.isKeyword()) { 1807 // If we've found the keyword "super" (the only keyword that would be 1808 // returned by CorrectTypo), this is a send to super. 1809 Diag(NameLoc, diag::err_unknown_receiver_suggest) 1810 << Name << Corrected.getCorrection() 1811 << FixItHint::CreateReplacement(SourceRange(NameLoc), "super"); 1812 return ObjCSuperMessage; 1813 } else if (ObjCInterfaceDecl *Class = 1814 Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>()) { 1815 // If we found a declaration, correct when it refers to an Objective-C 1816 // class. 1817 Diag(NameLoc, diag::err_unknown_receiver_suggest) 1818 << Name << Corrected.getCorrection() 1819 << FixItHint::CreateReplacement(SourceRange(NameLoc), 1820 Class->getNameAsString()); 1821 Diag(Class->getLocation(), diag::note_previous_decl) 1822 << Corrected.getCorrection(); 1823 1824 QualType T = Context.getObjCInterfaceType(Class); 1825 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc); 1826 ReceiverType = CreateParsedType(T, TSInfo); 1827 return ObjCClassMessage; 1828 } 1829 } 1830 1831 // Fall back: let the parser try to parse it as an instance message. 1832 return ObjCInstanceMessage; 1833} 1834 1835ExprResult Sema::ActOnSuperMessage(Scope *S, 1836 SourceLocation SuperLoc, 1837 Selector Sel, 1838 SourceLocation LBracLoc, 1839 ArrayRef<SourceLocation> SelectorLocs, 1840 SourceLocation RBracLoc, 1841 MultiExprArg Args) { 1842 // Determine whether we are inside a method or not. 1843 ObjCMethodDecl *Method = tryCaptureObjCSelf(SuperLoc); 1844 if (!Method) { 1845 Diag(SuperLoc, diag::err_invalid_receiver_to_message_super); 1846 return ExprError(); 1847 } 1848 1849 ObjCInterfaceDecl *Class = Method->getClassInterface(); 1850 if (!Class) { 1851 Diag(SuperLoc, diag::error_no_super_class_message) 1852 << Method->getDeclName(); 1853 return ExprError(); 1854 } 1855 1856 ObjCInterfaceDecl *Super = Class->getSuperClass(); 1857 if (!Super) { 1858 // The current class does not have a superclass. 1859 Diag(SuperLoc, diag::error_root_class_cannot_use_super) 1860 << Class->getIdentifier(); 1861 return ExprError(); 1862 } 1863 1864 // We are in a method whose class has a superclass, so 'super' 1865 // is acting as a keyword. 1866 if (Method->getSelector() == Sel) 1867 getCurFunction()->ObjCShouldCallSuper = false; 1868 1869 if (Method->isInstanceMethod()) { 1870 // Since we are in an instance method, this is an instance 1871 // message to the superclass instance. 1872 QualType SuperTy = Context.getObjCInterfaceType(Super); 1873 SuperTy = Context.getObjCObjectPointerType(SuperTy); 1874 return BuildInstanceMessage(0, SuperTy, SuperLoc, 1875 Sel, /*Method=*/0, 1876 LBracLoc, SelectorLocs, RBracLoc, Args); 1877 } 1878 1879 // Since we are in a class method, this is a class message to 1880 // the superclass. 1881 return BuildClassMessage(/*ReceiverTypeInfo=*/0, 1882 Context.getObjCInterfaceType(Super), 1883 SuperLoc, Sel, /*Method=*/0, 1884 LBracLoc, SelectorLocs, RBracLoc, Args); 1885} 1886 1887 1888ExprResult Sema::BuildClassMessageImplicit(QualType ReceiverType, 1889 bool isSuperReceiver, 1890 SourceLocation Loc, 1891 Selector Sel, 1892 ObjCMethodDecl *Method, 1893 MultiExprArg Args) { 1894 TypeSourceInfo *receiverTypeInfo = 0; 1895 if (!ReceiverType.isNull()) 1896 receiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType); 1897 1898 return BuildClassMessage(receiverTypeInfo, ReceiverType, 1899 /*SuperLoc=*/isSuperReceiver ? Loc : SourceLocation(), 1900 Sel, Method, Loc, Loc, Loc, Args, 1901 /*isImplicit=*/true); 1902 1903} 1904 1905static void applyCocoaAPICheck(Sema &S, const ObjCMessageExpr *Msg, 1906 unsigned DiagID, 1907 bool (*refactor)(const ObjCMessageExpr *, 1908 const NSAPI &, edit::Commit &)) { 1909 SourceLocation MsgLoc = Msg->getExprLoc(); 1910 if (S.Diags.getDiagnosticLevel(DiagID, MsgLoc) == DiagnosticsEngine::Ignored) 1911 return; 1912 1913 SourceManager &SM = S.SourceMgr; 1914 edit::Commit ECommit(SM, S.LangOpts); 1915 if (refactor(Msg,*S.NSAPIObj, ECommit)) { 1916 DiagnosticBuilder Builder = S.Diag(MsgLoc, DiagID) 1917 << Msg->getSelector() << Msg->getSourceRange(); 1918 // FIXME: Don't emit diagnostic at all if fixits are non-commitable. 1919 if (!ECommit.isCommitable()) 1920 return; 1921 for (edit::Commit::edit_iterator 1922 I = ECommit.edit_begin(), E = ECommit.edit_end(); I != E; ++I) { 1923 const edit::Commit::Edit &Edit = *I; 1924 switch (Edit.Kind) { 1925 case edit::Commit::Act_Insert: 1926 Builder.AddFixItHint(FixItHint::CreateInsertion(Edit.OrigLoc, 1927 Edit.Text, 1928 Edit.BeforePrev)); 1929 break; 1930 case edit::Commit::Act_InsertFromRange: 1931 Builder.AddFixItHint( 1932 FixItHint::CreateInsertionFromRange(Edit.OrigLoc, 1933 Edit.getInsertFromRange(SM), 1934 Edit.BeforePrev)); 1935 break; 1936 case edit::Commit::Act_Remove: 1937 Builder.AddFixItHint(FixItHint::CreateRemoval(Edit.getFileRange(SM))); 1938 break; 1939 } 1940 } 1941 } 1942} 1943 1944static void checkCocoaAPI(Sema &S, const ObjCMessageExpr *Msg) { 1945 applyCocoaAPICheck(S, Msg, diag::warn_objc_redundant_literal_use, 1946 edit::rewriteObjCRedundantCallWithLiteral); 1947} 1948 1949/// \brief Build an Objective-C class message expression. 1950/// 1951/// This routine takes care of both normal class messages and 1952/// class messages to the superclass. 1953/// 1954/// \param ReceiverTypeInfo Type source information that describes the 1955/// receiver of this message. This may be NULL, in which case we are 1956/// sending to the superclass and \p SuperLoc must be a valid source 1957/// location. 1958 1959/// \param ReceiverType The type of the object receiving the 1960/// message. When \p ReceiverTypeInfo is non-NULL, this is the same 1961/// type as that refers to. For a superclass send, this is the type of 1962/// the superclass. 1963/// 1964/// \param SuperLoc The location of the "super" keyword in a 1965/// superclass message. 1966/// 1967/// \param Sel The selector to which the message is being sent. 1968/// 1969/// \param Method The method that this class message is invoking, if 1970/// already known. 1971/// 1972/// \param LBracLoc The location of the opening square bracket ']'. 1973/// 1974/// \param RBracLoc The location of the closing square bracket ']'. 1975/// 1976/// \param ArgsIn The message arguments. 1977ExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo, 1978 QualType ReceiverType, 1979 SourceLocation SuperLoc, 1980 Selector Sel, 1981 ObjCMethodDecl *Method, 1982 SourceLocation LBracLoc, 1983 ArrayRef<SourceLocation> SelectorLocs, 1984 SourceLocation RBracLoc, 1985 MultiExprArg ArgsIn, 1986 bool isImplicit) { 1987 SourceLocation Loc = SuperLoc.isValid()? SuperLoc 1988 : ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin(); 1989 if (LBracLoc.isInvalid()) { 1990 Diag(Loc, diag::err_missing_open_square_message_send) 1991 << FixItHint::CreateInsertion(Loc, "["); 1992 LBracLoc = Loc; 1993 } 1994 1995 if (ReceiverType->isDependentType()) { 1996 // If the receiver type is dependent, we can't type-check anything 1997 // at this point. Build a dependent expression. 1998 unsigned NumArgs = ArgsIn.size(); 1999 Expr **Args = ArgsIn.data(); 2000 assert(SuperLoc.isInvalid() && "Message to super with dependent type"); 2001 return Owned(ObjCMessageExpr::Create(Context, ReceiverType, 2002 VK_RValue, LBracLoc, ReceiverTypeInfo, 2003 Sel, SelectorLocs, /*Method=*/0, 2004 makeArrayRef(Args, NumArgs),RBracLoc, 2005 isImplicit)); 2006 } 2007 2008 // Find the class to which we are sending this message. 2009 ObjCInterfaceDecl *Class = 0; 2010 const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>(); 2011 if (!ClassType || !(Class = ClassType->getInterface())) { 2012 Diag(Loc, diag::err_invalid_receiver_class_message) 2013 << ReceiverType; 2014 return ExprError(); 2015 } 2016 assert(Class && "We don't know which class we're messaging?"); 2017 // objc++ diagnoses during typename annotation. 2018 if (!getLangOpts().CPlusPlus) 2019 (void)DiagnoseUseOfDecl(Class, Loc); 2020 // Find the method we are messaging. 2021 if (!Method) { 2022 SourceRange TypeRange 2023 = SuperLoc.isValid()? SourceRange(SuperLoc) 2024 : ReceiverTypeInfo->getTypeLoc().getSourceRange(); 2025 if (RequireCompleteType(Loc, Context.getObjCInterfaceType(Class), 2026 (getLangOpts().ObjCAutoRefCount 2027 ? diag::err_arc_receiver_forward_class 2028 : diag::warn_receiver_forward_class), 2029 TypeRange)) { 2030 // A forward class used in messaging is treated as a 'Class' 2031 Method = LookupFactoryMethodInGlobalPool(Sel, 2032 SourceRange(LBracLoc, RBracLoc)); 2033 if (Method && !getLangOpts().ObjCAutoRefCount) 2034 Diag(Method->getLocation(), diag::note_method_sent_forward_class) 2035 << Method->getDeclName(); 2036 } 2037 if (!Method) 2038 Method = Class->lookupClassMethod(Sel); 2039 2040 // If we have an implementation in scope, check "private" methods. 2041 if (!Method) 2042 Method = Class->lookupPrivateClassMethod(Sel); 2043 2044 if (Method && DiagnoseUseOfDecl(Method, Loc)) 2045 return ExprError(); 2046 } 2047 2048 // Check the argument types and determine the result type. 2049 QualType ReturnType; 2050 ExprValueKind VK = VK_RValue; 2051 2052 unsigned NumArgs = ArgsIn.size(); 2053 Expr **Args = ArgsIn.data(); 2054 if (CheckMessageArgumentTypes(ReceiverType, Args, NumArgs, Sel, SelectorLocs, 2055 Method, true, 2056 SuperLoc.isValid(), LBracLoc, RBracLoc, 2057 ReturnType, VK)) 2058 return ExprError(); 2059 2060 if (Method && !Method->getResultType()->isVoidType() && 2061 RequireCompleteType(LBracLoc, Method->getResultType(), 2062 diag::err_illegal_message_expr_incomplete_type)) 2063 return ExprError(); 2064 2065 // Construct the appropriate ObjCMessageExpr. 2066 ObjCMessageExpr *Result; 2067 if (SuperLoc.isValid()) 2068 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc, 2069 SuperLoc, /*IsInstanceSuper=*/false, 2070 ReceiverType, Sel, SelectorLocs, 2071 Method, makeArrayRef(Args, NumArgs), 2072 RBracLoc, isImplicit); 2073 else { 2074 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc, 2075 ReceiverTypeInfo, Sel, SelectorLocs, 2076 Method, makeArrayRef(Args, NumArgs), 2077 RBracLoc, isImplicit); 2078 if (!isImplicit) 2079 checkCocoaAPI(*this, Result); 2080 } 2081 return MaybeBindToTemporary(Result); 2082} 2083 2084// ActOnClassMessage - used for both unary and keyword messages. 2085// ArgExprs is optional - if it is present, the number of expressions 2086// is obtained from Sel.getNumArgs(). 2087ExprResult Sema::ActOnClassMessage(Scope *S, 2088 ParsedType Receiver, 2089 Selector Sel, 2090 SourceLocation LBracLoc, 2091 ArrayRef<SourceLocation> SelectorLocs, 2092 SourceLocation RBracLoc, 2093 MultiExprArg Args) { 2094 TypeSourceInfo *ReceiverTypeInfo; 2095 QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo); 2096 if (ReceiverType.isNull()) 2097 return ExprError(); 2098 2099 2100 if (!ReceiverTypeInfo) 2101 ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc); 2102 2103 return BuildClassMessage(ReceiverTypeInfo, ReceiverType, 2104 /*SuperLoc=*/SourceLocation(), Sel, /*Method=*/0, 2105 LBracLoc, SelectorLocs, RBracLoc, Args); 2106} 2107 2108ExprResult Sema::BuildInstanceMessageImplicit(Expr *Receiver, 2109 QualType ReceiverType, 2110 SourceLocation Loc, 2111 Selector Sel, 2112 ObjCMethodDecl *Method, 2113 MultiExprArg Args) { 2114 return BuildInstanceMessage(Receiver, ReceiverType, 2115 /*SuperLoc=*/!Receiver ? Loc : SourceLocation(), 2116 Sel, Method, Loc, Loc, Loc, Args, 2117 /*isImplicit=*/true); 2118} 2119 2120/// \brief Build an Objective-C instance message expression. 2121/// 2122/// This routine takes care of both normal instance messages and 2123/// instance messages to the superclass instance. 2124/// 2125/// \param Receiver The expression that computes the object that will 2126/// receive this message. This may be empty, in which case we are 2127/// sending to the superclass instance and \p SuperLoc must be a valid 2128/// source location. 2129/// 2130/// \param ReceiverType The (static) type of the object receiving the 2131/// message. When a \p Receiver expression is provided, this is the 2132/// same type as that expression. For a superclass instance send, this 2133/// is a pointer to the type of the superclass. 2134/// 2135/// \param SuperLoc The location of the "super" keyword in a 2136/// superclass instance message. 2137/// 2138/// \param Sel The selector to which the message is being sent. 2139/// 2140/// \param Method The method that this instance message is invoking, if 2141/// already known. 2142/// 2143/// \param LBracLoc The location of the opening square bracket ']'. 2144/// 2145/// \param RBracLoc The location of the closing square bracket ']'. 2146/// 2147/// \param ArgsIn The message arguments. 2148ExprResult Sema::BuildInstanceMessage(Expr *Receiver, 2149 QualType ReceiverType, 2150 SourceLocation SuperLoc, 2151 Selector Sel, 2152 ObjCMethodDecl *Method, 2153 SourceLocation LBracLoc, 2154 ArrayRef<SourceLocation> SelectorLocs, 2155 SourceLocation RBracLoc, 2156 MultiExprArg ArgsIn, 2157 bool isImplicit) { 2158 // The location of the receiver. 2159 SourceLocation Loc = SuperLoc.isValid()? SuperLoc : Receiver->getLocStart(); 2160 2161 if (LBracLoc.isInvalid()) { 2162 Diag(Loc, diag::err_missing_open_square_message_send) 2163 << FixItHint::CreateInsertion(Loc, "["); 2164 LBracLoc = Loc; 2165 } 2166 2167 // If we have a receiver expression, perform appropriate promotions 2168 // and determine receiver type. 2169 if (Receiver) { 2170 if (Receiver->hasPlaceholderType()) { 2171 ExprResult Result; 2172 if (Receiver->getType() == Context.UnknownAnyTy) 2173 Result = forceUnknownAnyToType(Receiver, Context.getObjCIdType()); 2174 else 2175 Result = CheckPlaceholderExpr(Receiver); 2176 if (Result.isInvalid()) return ExprError(); 2177 Receiver = Result.take(); 2178 } 2179 2180 if (Receiver->isTypeDependent()) { 2181 // If the receiver is type-dependent, we can't type-check anything 2182 // at this point. Build a dependent expression. 2183 unsigned NumArgs = ArgsIn.size(); 2184 Expr **Args = ArgsIn.data(); 2185 assert(SuperLoc.isInvalid() && "Message to super with dependent type"); 2186 return Owned(ObjCMessageExpr::Create(Context, Context.DependentTy, 2187 VK_RValue, LBracLoc, Receiver, Sel, 2188 SelectorLocs, /*Method=*/0, 2189 makeArrayRef(Args, NumArgs), 2190 RBracLoc, isImplicit)); 2191 } 2192 2193 // If necessary, apply function/array conversion to the receiver. 2194 // C99 6.7.5.3p[7,8]. 2195 ExprResult Result = DefaultFunctionArrayLvalueConversion(Receiver); 2196 if (Result.isInvalid()) 2197 return ExprError(); 2198 Receiver = Result.take(); 2199 ReceiverType = Receiver->getType(); 2200 2201 // If the receiver is an ObjC pointer, a block pointer, or an 2202 // __attribute__((NSObject)) pointer, we don't need to do any 2203 // special conversion in order to look up a receiver. 2204 if (ReceiverType->isObjCRetainableType()) { 2205 // do nothing 2206 } else if (!getLangOpts().ObjCAutoRefCount && 2207 !Context.getObjCIdType().isNull() && 2208 (ReceiverType->isPointerType() || 2209 ReceiverType->isIntegerType())) { 2210 // Implicitly convert integers and pointers to 'id' but emit a warning. 2211 // But not in ARC. 2212 Diag(Loc, diag::warn_bad_receiver_type) 2213 << ReceiverType 2214 << Receiver->getSourceRange(); 2215 if (ReceiverType->isPointerType()) { 2216 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(), 2217 CK_CPointerToObjCPointerCast).take(); 2218 } else { 2219 // TODO: specialized warning on null receivers? 2220 bool IsNull = Receiver->isNullPointerConstant(Context, 2221 Expr::NPC_ValueDependentIsNull); 2222 CastKind Kind = IsNull ? CK_NullToPointer : CK_IntegralToPointer; 2223 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(), 2224 Kind).take(); 2225 } 2226 ReceiverType = Receiver->getType(); 2227 } else if (getLangOpts().CPlusPlus) { 2228 ExprResult result = PerformContextuallyConvertToObjCPointer(Receiver); 2229 if (result.isUsable()) { 2230 Receiver = result.take(); 2231 ReceiverType = Receiver->getType(); 2232 } 2233 } 2234 } 2235 2236 // There's a somewhat weird interaction here where we assume that we 2237 // won't actually have a method unless we also don't need to do some 2238 // of the more detailed type-checking on the receiver. 2239 2240 if (!Method) { 2241 // Handle messages to id. 2242 bool receiverIsId = ReceiverType->isObjCIdType(); 2243 if (receiverIsId || ReceiverType->isBlockPointerType() || 2244 (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) { 2245 Method = LookupInstanceMethodInGlobalPool(Sel, 2246 SourceRange(LBracLoc, RBracLoc), 2247 receiverIsId); 2248 if (!Method) 2249 Method = LookupFactoryMethodInGlobalPool(Sel, 2250 SourceRange(LBracLoc,RBracLoc), 2251 receiverIsId); 2252 } else if (ReceiverType->isObjCClassType() || 2253 ReceiverType->isObjCQualifiedClassType()) { 2254 // Handle messages to Class. 2255 // We allow sending a message to a qualified Class ("Class<foo>"), which 2256 // is ok as long as one of the protocols implements the selector (if not, warn). 2257 if (const ObjCObjectPointerType *QClassTy 2258 = ReceiverType->getAsObjCQualifiedClassType()) { 2259 // Search protocols for class methods. 2260 Method = LookupMethodInQualifiedType(Sel, QClassTy, false); 2261 if (!Method) { 2262 Method = LookupMethodInQualifiedType(Sel, QClassTy, true); 2263 // warn if instance method found for a Class message. 2264 if (Method) { 2265 Diag(Loc, diag::warn_instance_method_on_class_found) 2266 << Method->getSelector() << Sel; 2267 Diag(Method->getLocation(), diag::note_method_declared_at) 2268 << Method->getDeclName(); 2269 } 2270 } 2271 } else { 2272 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) { 2273 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) { 2274 // First check the public methods in the class interface. 2275 Method = ClassDecl->lookupClassMethod(Sel); 2276 2277 if (!Method) 2278 Method = ClassDecl->lookupPrivateClassMethod(Sel); 2279 } 2280 if (Method && DiagnoseUseOfDecl(Method, Loc)) 2281 return ExprError(); 2282 } 2283 if (!Method) { 2284 // If not messaging 'self', look for any factory method named 'Sel'. 2285 if (!Receiver || !isSelfExpr(Receiver)) { 2286 Method = LookupFactoryMethodInGlobalPool(Sel, 2287 SourceRange(LBracLoc, RBracLoc), 2288 true); 2289 if (!Method) { 2290 // If no class (factory) method was found, check if an _instance_ 2291 // method of the same name exists in the root class only. 2292 Method = LookupInstanceMethodInGlobalPool(Sel, 2293 SourceRange(LBracLoc, RBracLoc), 2294 true); 2295 if (Method) 2296 if (const ObjCInterfaceDecl *ID = 2297 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) { 2298 if (ID->getSuperClass()) 2299 Diag(Loc, diag::warn_root_inst_method_not_found) 2300 << Sel << SourceRange(LBracLoc, RBracLoc); 2301 } 2302 } 2303 } 2304 } 2305 } 2306 } else { 2307 ObjCInterfaceDecl* ClassDecl = 0; 2308 2309 // We allow sending a message to a qualified ID ("id<foo>"), which is ok as 2310 // long as one of the protocols implements the selector (if not, warn). 2311 // And as long as message is not deprecated/unavailable (warn if it is). 2312 if (const ObjCObjectPointerType *QIdTy 2313 = ReceiverType->getAsObjCQualifiedIdType()) { 2314 // Search protocols for instance methods. 2315 Method = LookupMethodInQualifiedType(Sel, QIdTy, true); 2316 if (!Method) 2317 Method = LookupMethodInQualifiedType(Sel, QIdTy, false); 2318 if (Method && DiagnoseUseOfDecl(Method, Loc)) 2319 return ExprError(); 2320 } else if (const ObjCObjectPointerType *OCIType 2321 = ReceiverType->getAsObjCInterfacePointerType()) { 2322 // We allow sending a message to a pointer to an interface (an object). 2323 ClassDecl = OCIType->getInterfaceDecl(); 2324 2325 // Try to complete the type. Under ARC, this is a hard error from which 2326 // we don't try to recover. 2327 const ObjCInterfaceDecl *forwardClass = 0; 2328 if (RequireCompleteType(Loc, OCIType->getPointeeType(), 2329 getLangOpts().ObjCAutoRefCount 2330 ? diag::err_arc_receiver_forward_instance 2331 : diag::warn_receiver_forward_instance, 2332 Receiver? Receiver->getSourceRange() 2333 : SourceRange(SuperLoc))) { 2334 if (getLangOpts().ObjCAutoRefCount) 2335 return ExprError(); 2336 2337 forwardClass = OCIType->getInterfaceDecl(); 2338 Diag(Receiver ? Receiver->getLocStart() 2339 : SuperLoc, diag::note_receiver_is_id); 2340 Method = 0; 2341 } else { 2342 Method = ClassDecl->lookupInstanceMethod(Sel); 2343 } 2344 2345 if (!Method) 2346 // Search protocol qualifiers. 2347 Method = LookupMethodInQualifiedType(Sel, OCIType, true); 2348 2349 if (!Method) { 2350 // If we have implementations in scope, check "private" methods. 2351 Method = ClassDecl->lookupPrivateMethod(Sel); 2352 2353 if (!Method && getLangOpts().ObjCAutoRefCount) { 2354 Diag(Loc, diag::err_arc_may_not_respond) 2355 << OCIType->getPointeeType() << Sel 2356 << SourceRange(SelectorLocs.front(), SelectorLocs.back()); 2357 return ExprError(); 2358 } 2359 2360 if (!Method && (!Receiver || !isSelfExpr(Receiver))) { 2361 // If we still haven't found a method, look in the global pool. This 2362 // behavior isn't very desirable, however we need it for GCC 2363 // compatibility. FIXME: should we deviate?? 2364 if (OCIType->qual_empty()) { 2365 Method = LookupInstanceMethodInGlobalPool(Sel, 2366 SourceRange(LBracLoc, RBracLoc)); 2367 if (Method && !forwardClass) 2368 Diag(Loc, diag::warn_maynot_respond) 2369 << OCIType->getInterfaceDecl()->getIdentifier() << Sel; 2370 } 2371 } 2372 } 2373 if (Method && DiagnoseUseOfDecl(Method, Loc, forwardClass)) 2374 return ExprError(); 2375 } else { 2376 // Reject other random receiver types (e.g. structs). 2377 Diag(Loc, diag::err_bad_receiver_type) 2378 << ReceiverType << Receiver->getSourceRange(); 2379 return ExprError(); 2380 } 2381 } 2382 } 2383 2384 // Check the message arguments. 2385 unsigned NumArgs = ArgsIn.size(); 2386 Expr **Args = ArgsIn.data(); 2387 QualType ReturnType; 2388 ExprValueKind VK = VK_RValue; 2389 bool ClassMessage = (ReceiverType->isObjCClassType() || 2390 ReceiverType->isObjCQualifiedClassType()); 2391 if (CheckMessageArgumentTypes(ReceiverType, Args, NumArgs, Sel, 2392 SelectorLocs, Method, 2393 ClassMessage, SuperLoc.isValid(), 2394 LBracLoc, RBracLoc, ReturnType, VK)) 2395 return ExprError(); 2396 2397 if (Method && !Method->getResultType()->isVoidType() && 2398 RequireCompleteType(LBracLoc, Method->getResultType(), 2399 diag::err_illegal_message_expr_incomplete_type)) 2400 return ExprError(); 2401 2402 SourceLocation SelLoc = SelectorLocs.front(); 2403 2404 // In ARC, forbid the user from sending messages to 2405 // retain/release/autorelease/dealloc/retainCount explicitly. 2406 if (getLangOpts().ObjCAutoRefCount) { 2407 ObjCMethodFamily family = 2408 (Method ? Method->getMethodFamily() : Sel.getMethodFamily()); 2409 switch (family) { 2410 case OMF_init: 2411 if (Method) 2412 checkInitMethod(Method, ReceiverType); 2413 2414 case OMF_None: 2415 case OMF_alloc: 2416 case OMF_copy: 2417 case OMF_finalize: 2418 case OMF_mutableCopy: 2419 case OMF_new: 2420 case OMF_self: 2421 break; 2422 2423 case OMF_dealloc: 2424 case OMF_retain: 2425 case OMF_release: 2426 case OMF_autorelease: 2427 case OMF_retainCount: 2428 Diag(Loc, diag::err_arc_illegal_explicit_message) 2429 << Sel << SelLoc; 2430 break; 2431 2432 case OMF_performSelector: 2433 if (Method && NumArgs >= 1) { 2434 if (ObjCSelectorExpr *SelExp = dyn_cast<ObjCSelectorExpr>(Args[0])) { 2435 Selector ArgSel = SelExp->getSelector(); 2436 ObjCMethodDecl *SelMethod = 2437 LookupInstanceMethodInGlobalPool(ArgSel, 2438 SelExp->getSourceRange()); 2439 if (!SelMethod) 2440 SelMethod = 2441 LookupFactoryMethodInGlobalPool(ArgSel, 2442 SelExp->getSourceRange()); 2443 if (SelMethod) { 2444 ObjCMethodFamily SelFamily = SelMethod->getMethodFamily(); 2445 switch (SelFamily) { 2446 case OMF_alloc: 2447 case OMF_copy: 2448 case OMF_mutableCopy: 2449 case OMF_new: 2450 case OMF_self: 2451 case OMF_init: 2452 // Issue error, unless ns_returns_not_retained. 2453 if (!SelMethod->hasAttr<NSReturnsNotRetainedAttr>()) { 2454 // selector names a +1 method 2455 Diag(SelLoc, 2456 diag::err_arc_perform_selector_retains); 2457 Diag(SelMethod->getLocation(), diag::note_method_declared_at) 2458 << SelMethod->getDeclName(); 2459 } 2460 break; 2461 default: 2462 // +0 call. OK. unless ns_returns_retained. 2463 if (SelMethod->hasAttr<NSReturnsRetainedAttr>()) { 2464 // selector names a +1 method 2465 Diag(SelLoc, 2466 diag::err_arc_perform_selector_retains); 2467 Diag(SelMethod->getLocation(), diag::note_method_declared_at) 2468 << SelMethod->getDeclName(); 2469 } 2470 break; 2471 } 2472 } 2473 } else { 2474 // error (may leak). 2475 Diag(SelLoc, diag::warn_arc_perform_selector_leaks); 2476 Diag(Args[0]->getExprLoc(), diag::note_used_here); 2477 } 2478 } 2479 break; 2480 } 2481 } 2482 2483 // Construct the appropriate ObjCMessageExpr instance. 2484 ObjCMessageExpr *Result; 2485 if (SuperLoc.isValid()) 2486 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc, 2487 SuperLoc, /*IsInstanceSuper=*/true, 2488 ReceiverType, Sel, SelectorLocs, Method, 2489 makeArrayRef(Args, NumArgs), RBracLoc, 2490 isImplicit); 2491 else { 2492 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc, 2493 Receiver, Sel, SelectorLocs, Method, 2494 makeArrayRef(Args, NumArgs), RBracLoc, 2495 isImplicit); 2496 if (!isImplicit) 2497 checkCocoaAPI(*this, Result); 2498 } 2499 2500 if (getLangOpts().ObjCAutoRefCount) { 2501 DiagnoseARCUseOfWeakReceiver(*this, Receiver); 2502 2503 // In ARC, annotate delegate init calls. 2504 if (Result->getMethodFamily() == OMF_init && 2505 (SuperLoc.isValid() || isSelfExpr(Receiver))) { 2506 // Only consider init calls *directly* in init implementations, 2507 // not within blocks. 2508 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(CurContext); 2509 if (method && method->getMethodFamily() == OMF_init) { 2510 // The implicit assignment to self means we also don't want to 2511 // consume the result. 2512 Result->setDelegateInitCall(true); 2513 return Owned(Result); 2514 } 2515 } 2516 2517 // In ARC, check for message sends which are likely to introduce 2518 // retain cycles. 2519 checkRetainCycles(Result); 2520 2521 if (!isImplicit && Method) { 2522 if (const ObjCPropertyDecl *Prop = Method->findPropertyDecl()) { 2523 bool IsWeak = 2524 Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak; 2525 if (!IsWeak && Sel.isUnarySelector()) 2526 IsWeak = ReturnType.getObjCLifetime() & Qualifiers::OCL_Weak; 2527 2528 if (IsWeak) { 2529 DiagnosticsEngine::Level Level = 2530 Diags.getDiagnosticLevel(diag::warn_arc_repeated_use_of_weak, 2531 LBracLoc); 2532 if (Level != DiagnosticsEngine::Ignored) 2533 getCurFunction()->recordUseOfWeak(Result, Prop); 2534 2535 } 2536 } 2537 } 2538 } 2539 2540 return MaybeBindToTemporary(Result); 2541} 2542 2543static void RemoveSelectorFromWarningCache(Sema &S, Expr* Arg) { 2544 if (ObjCSelectorExpr *OSE = 2545 dyn_cast<ObjCSelectorExpr>(Arg->IgnoreParenCasts())) { 2546 Selector Sel = OSE->getSelector(); 2547 SourceLocation Loc = OSE->getAtLoc(); 2548 llvm::DenseMap<Selector, SourceLocation>::iterator Pos 2549 = S.ReferencedSelectors.find(Sel); 2550 if (Pos != S.ReferencedSelectors.end() && Pos->second == Loc) 2551 S.ReferencedSelectors.erase(Pos); 2552 } 2553} 2554 2555// ActOnInstanceMessage - used for both unary and keyword messages. 2556// ArgExprs is optional - if it is present, the number of expressions 2557// is obtained from Sel.getNumArgs(). 2558ExprResult Sema::ActOnInstanceMessage(Scope *S, 2559 Expr *Receiver, 2560 Selector Sel, 2561 SourceLocation LBracLoc, 2562 ArrayRef<SourceLocation> SelectorLocs, 2563 SourceLocation RBracLoc, 2564 MultiExprArg Args) { 2565 if (!Receiver) 2566 return ExprError(); 2567 2568 // A ParenListExpr can show up while doing error recovery with invalid code. 2569 if (isa<ParenListExpr>(Receiver)) { 2570 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Receiver); 2571 if (Result.isInvalid()) return ExprError(); 2572 Receiver = Result.take(); 2573 } 2574 2575 if (RespondsToSelectorSel.isNull()) { 2576 IdentifierInfo *SelectorId = &Context.Idents.get("respondsToSelector"); 2577 RespondsToSelectorSel = Context.Selectors.getUnarySelector(SelectorId); 2578 } 2579 if (Sel == RespondsToSelectorSel) 2580 RemoveSelectorFromWarningCache(*this, Args[0]); 2581 2582 return BuildInstanceMessage(Receiver, Receiver->getType(), 2583 /*SuperLoc=*/SourceLocation(), Sel, /*Method=*/0, 2584 LBracLoc, SelectorLocs, RBracLoc, Args); 2585} 2586 2587enum ARCConversionTypeClass { 2588 /// int, void, struct A 2589 ACTC_none, 2590 2591 /// id, void (^)() 2592 ACTC_retainable, 2593 2594 /// id*, id***, void (^*)(), 2595 ACTC_indirectRetainable, 2596 2597 /// void* might be a normal C type, or it might a CF type. 2598 ACTC_voidPtr, 2599 2600 /// struct A* 2601 ACTC_coreFoundation 2602}; 2603static bool isAnyRetainable(ARCConversionTypeClass ACTC) { 2604 return (ACTC == ACTC_retainable || 2605 ACTC == ACTC_coreFoundation || 2606 ACTC == ACTC_voidPtr); 2607} 2608static bool isAnyCLike(ARCConversionTypeClass ACTC) { 2609 return ACTC == ACTC_none || 2610 ACTC == ACTC_voidPtr || 2611 ACTC == ACTC_coreFoundation; 2612} 2613 2614static ARCConversionTypeClass classifyTypeForARCConversion(QualType type) { 2615 bool isIndirect = false; 2616 2617 // Ignore an outermost reference type. 2618 if (const ReferenceType *ref = type->getAs<ReferenceType>()) { 2619 type = ref->getPointeeType(); 2620 isIndirect = true; 2621 } 2622 2623 // Drill through pointers and arrays recursively. 2624 while (true) { 2625 if (const PointerType *ptr = type->getAs<PointerType>()) { 2626 type = ptr->getPointeeType(); 2627 2628 // The first level of pointer may be the innermost pointer on a CF type. 2629 if (!isIndirect) { 2630 if (type->isVoidType()) return ACTC_voidPtr; 2631 if (type->isRecordType()) return ACTC_coreFoundation; 2632 } 2633 } else if (const ArrayType *array = type->getAsArrayTypeUnsafe()) { 2634 type = QualType(array->getElementType()->getBaseElementTypeUnsafe(), 0); 2635 } else { 2636 break; 2637 } 2638 isIndirect = true; 2639 } 2640 2641 if (isIndirect) { 2642 if (type->isObjCARCBridgableType()) 2643 return ACTC_indirectRetainable; 2644 return ACTC_none; 2645 } 2646 2647 if (type->isObjCARCBridgableType()) 2648 return ACTC_retainable; 2649 2650 return ACTC_none; 2651} 2652 2653namespace { 2654 /// A result from the cast checker. 2655 enum ACCResult { 2656 /// Cannot be casted. 2657 ACC_invalid, 2658 2659 /// Can be safely retained or not retained. 2660 ACC_bottom, 2661 2662 /// Can be casted at +0. 2663 ACC_plusZero, 2664 2665 /// Can be casted at +1. 2666 ACC_plusOne 2667 }; 2668 ACCResult merge(ACCResult left, ACCResult right) { 2669 if (left == right) return left; 2670 if (left == ACC_bottom) return right; 2671 if (right == ACC_bottom) return left; 2672 return ACC_invalid; 2673 } 2674 2675 /// A checker which white-lists certain expressions whose conversion 2676 /// to or from retainable type would otherwise be forbidden in ARC. 2677 class ARCCastChecker : public StmtVisitor<ARCCastChecker, ACCResult> { 2678 typedef StmtVisitor<ARCCastChecker, ACCResult> super; 2679 2680 ASTContext &Context; 2681 ARCConversionTypeClass SourceClass; 2682 ARCConversionTypeClass TargetClass; 2683 bool Diagnose; 2684 2685 static bool isCFType(QualType type) { 2686 // Someday this can use ns_bridged. For now, it has to do this. 2687 return type->isCARCBridgableType(); 2688 } 2689 2690 public: 2691 ARCCastChecker(ASTContext &Context, ARCConversionTypeClass source, 2692 ARCConversionTypeClass target, bool diagnose) 2693 : Context(Context), SourceClass(source), TargetClass(target), 2694 Diagnose(diagnose) {} 2695 2696 using super::Visit; 2697 ACCResult Visit(Expr *e) { 2698 return super::Visit(e->IgnoreParens()); 2699 } 2700 2701 ACCResult VisitStmt(Stmt *s) { 2702 return ACC_invalid; 2703 } 2704 2705 /// Null pointer constants can be casted however you please. 2706 ACCResult VisitExpr(Expr *e) { 2707 if (e->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull)) 2708 return ACC_bottom; 2709 return ACC_invalid; 2710 } 2711 2712 /// Objective-C string literals can be safely casted. 2713 ACCResult VisitObjCStringLiteral(ObjCStringLiteral *e) { 2714 // If we're casting to any retainable type, go ahead. Global 2715 // strings are immune to retains, so this is bottom. 2716 if (isAnyRetainable(TargetClass)) return ACC_bottom; 2717 2718 return ACC_invalid; 2719 } 2720 2721 /// Look through certain implicit and explicit casts. 2722 ACCResult VisitCastExpr(CastExpr *e) { 2723 switch (e->getCastKind()) { 2724 case CK_NullToPointer: 2725 return ACC_bottom; 2726 2727 case CK_NoOp: 2728 case CK_LValueToRValue: 2729 case CK_BitCast: 2730 case CK_CPointerToObjCPointerCast: 2731 case CK_BlockPointerToObjCPointerCast: 2732 case CK_AnyPointerToBlockPointerCast: 2733 return Visit(e->getSubExpr()); 2734 2735 default: 2736 return ACC_invalid; 2737 } 2738 } 2739 2740 /// Look through unary extension. 2741 ACCResult VisitUnaryExtension(UnaryOperator *e) { 2742 return Visit(e->getSubExpr()); 2743 } 2744 2745 /// Ignore the LHS of a comma operator. 2746 ACCResult VisitBinComma(BinaryOperator *e) { 2747 return Visit(e->getRHS()); 2748 } 2749 2750 /// Conditional operators are okay if both sides are okay. 2751 ACCResult VisitConditionalOperator(ConditionalOperator *e) { 2752 ACCResult left = Visit(e->getTrueExpr()); 2753 if (left == ACC_invalid) return ACC_invalid; 2754 return merge(left, Visit(e->getFalseExpr())); 2755 } 2756 2757 /// Look through pseudo-objects. 2758 ACCResult VisitPseudoObjectExpr(PseudoObjectExpr *e) { 2759 // If we're getting here, we should always have a result. 2760 return Visit(e->getResultExpr()); 2761 } 2762 2763 /// Statement expressions are okay if their result expression is okay. 2764 ACCResult VisitStmtExpr(StmtExpr *e) { 2765 return Visit(e->getSubStmt()->body_back()); 2766 } 2767 2768 /// Some declaration references are okay. 2769 ACCResult VisitDeclRefExpr(DeclRefExpr *e) { 2770 // References to global constants from system headers are okay. 2771 // These are things like 'kCFStringTransformToLatin'. They are 2772 // can also be assumed to be immune to retains. 2773 VarDecl *var = dyn_cast<VarDecl>(e->getDecl()); 2774 if (isAnyRetainable(TargetClass) && 2775 isAnyRetainable(SourceClass) && 2776 var && 2777 var->getStorageClass() == SC_Extern && 2778 var->getType().isConstQualified() && 2779 Context.getSourceManager().isInSystemHeader(var->getLocation())) { 2780 return ACC_bottom; 2781 } 2782 2783 // Nothing else. 2784 return ACC_invalid; 2785 } 2786 2787 /// Some calls are okay. 2788 ACCResult VisitCallExpr(CallExpr *e) { 2789 if (FunctionDecl *fn = e->getDirectCallee()) 2790 if (ACCResult result = checkCallToFunction(fn)) 2791 return result; 2792 2793 return super::VisitCallExpr(e); 2794 } 2795 2796 ACCResult checkCallToFunction(FunctionDecl *fn) { 2797 // Require a CF*Ref return type. 2798 if (!isCFType(fn->getResultType())) 2799 return ACC_invalid; 2800 2801 if (!isAnyRetainable(TargetClass)) 2802 return ACC_invalid; 2803 2804 // Honor an explicit 'not retained' attribute. 2805 if (fn->hasAttr<CFReturnsNotRetainedAttr>()) 2806 return ACC_plusZero; 2807 2808 // Honor an explicit 'retained' attribute, except that for 2809 // now we're not going to permit implicit handling of +1 results, 2810 // because it's a bit frightening. 2811 if (fn->hasAttr<CFReturnsRetainedAttr>()) 2812 return Diagnose ? ACC_plusOne 2813 : ACC_invalid; // ACC_plusOne if we start accepting this 2814 2815 // Recognize this specific builtin function, which is used by CFSTR. 2816 unsigned builtinID = fn->getBuiltinID(); 2817 if (builtinID == Builtin::BI__builtin___CFStringMakeConstantString) 2818 return ACC_bottom; 2819 2820 // Otherwise, don't do anything implicit with an unaudited function. 2821 if (!fn->hasAttr<CFAuditedTransferAttr>()) 2822 return ACC_invalid; 2823 2824 // Otherwise, it's +0 unless it follows the create convention. 2825 if (ento::coreFoundation::followsCreateRule(fn)) 2826 return Diagnose ? ACC_plusOne 2827 : ACC_invalid; // ACC_plusOne if we start accepting this 2828 2829 return ACC_plusZero; 2830 } 2831 2832 ACCResult VisitObjCMessageExpr(ObjCMessageExpr *e) { 2833 return checkCallToMethod(e->getMethodDecl()); 2834 } 2835 2836 ACCResult VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *e) { 2837 ObjCMethodDecl *method; 2838 if (e->isExplicitProperty()) 2839 method = e->getExplicitProperty()->getGetterMethodDecl(); 2840 else 2841 method = e->getImplicitPropertyGetter(); 2842 return checkCallToMethod(method); 2843 } 2844 2845 ACCResult checkCallToMethod(ObjCMethodDecl *method) { 2846 if (!method) return ACC_invalid; 2847 2848 // Check for message sends to functions returning CF types. We 2849 // just obey the Cocoa conventions with these, even though the 2850 // return type is CF. 2851 if (!isAnyRetainable(TargetClass) || !isCFType(method->getResultType())) 2852 return ACC_invalid; 2853 2854 // If the method is explicitly marked not-retained, it's +0. 2855 if (method->hasAttr<CFReturnsNotRetainedAttr>()) 2856 return ACC_plusZero; 2857 2858 // If the method is explicitly marked as returning retained, or its 2859 // selector follows a +1 Cocoa convention, treat it as +1. 2860 if (method->hasAttr<CFReturnsRetainedAttr>()) 2861 return ACC_plusOne; 2862 2863 switch (method->getSelector().getMethodFamily()) { 2864 case OMF_alloc: 2865 case OMF_copy: 2866 case OMF_mutableCopy: 2867 case OMF_new: 2868 return ACC_plusOne; 2869 2870 default: 2871 // Otherwise, treat it as +0. 2872 return ACC_plusZero; 2873 } 2874 } 2875 }; 2876} 2877 2878bool Sema::isKnownName(StringRef name) { 2879 if (name.empty()) 2880 return false; 2881 LookupResult R(*this, &Context.Idents.get(name), SourceLocation(), 2882 Sema::LookupOrdinaryName); 2883 return LookupName(R, TUScope, false); 2884} 2885 2886static void addFixitForObjCARCConversion(Sema &S, 2887 DiagnosticBuilder &DiagB, 2888 Sema::CheckedConversionKind CCK, 2889 SourceLocation afterLParen, 2890 QualType castType, 2891 Expr *castExpr, 2892 Expr *realCast, 2893 const char *bridgeKeyword, 2894 const char *CFBridgeName) { 2895 // We handle C-style and implicit casts here. 2896 switch (CCK) { 2897 case Sema::CCK_ImplicitConversion: 2898 case Sema::CCK_CStyleCast: 2899 case Sema::CCK_OtherCast: 2900 break; 2901 case Sema::CCK_FunctionalCast: 2902 return; 2903 } 2904 2905 if (CFBridgeName) { 2906 if (CCK == Sema::CCK_OtherCast) { 2907 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) { 2908 SourceRange range(NCE->getOperatorLoc(), 2909 NCE->getAngleBrackets().getEnd()); 2910 SmallString<32> BridgeCall; 2911 2912 SourceManager &SM = S.getSourceManager(); 2913 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1)); 2914 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts())) 2915 BridgeCall += ' '; 2916 2917 BridgeCall += CFBridgeName; 2918 DiagB.AddFixItHint(FixItHint::CreateReplacement(range, BridgeCall)); 2919 } 2920 return; 2921 } 2922 Expr *castedE = castExpr; 2923 if (CStyleCastExpr *CCE = dyn_cast<CStyleCastExpr>(castedE)) 2924 castedE = CCE->getSubExpr(); 2925 castedE = castedE->IgnoreImpCasts(); 2926 SourceRange range = castedE->getSourceRange(); 2927 2928 SmallString<32> BridgeCall; 2929 2930 SourceManager &SM = S.getSourceManager(); 2931 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1)); 2932 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts())) 2933 BridgeCall += ' '; 2934 2935 BridgeCall += CFBridgeName; 2936 2937 if (isa<ParenExpr>(castedE)) { 2938 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(), 2939 BridgeCall)); 2940 } else { 2941 BridgeCall += '('; 2942 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(), 2943 BridgeCall)); 2944 DiagB.AddFixItHint(FixItHint::CreateInsertion( 2945 S.PP.getLocForEndOfToken(range.getEnd()), 2946 ")")); 2947 } 2948 return; 2949 } 2950 2951 if (CCK == Sema::CCK_CStyleCast) { 2952 DiagB.AddFixItHint(FixItHint::CreateInsertion(afterLParen, bridgeKeyword)); 2953 } else if (CCK == Sema::CCK_OtherCast) { 2954 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) { 2955 std::string castCode = "("; 2956 castCode += bridgeKeyword; 2957 castCode += castType.getAsString(); 2958 castCode += ")"; 2959 SourceRange Range(NCE->getOperatorLoc(), 2960 NCE->getAngleBrackets().getEnd()); 2961 DiagB.AddFixItHint(FixItHint::CreateReplacement(Range, castCode)); 2962 } 2963 } else { 2964 std::string castCode = "("; 2965 castCode += bridgeKeyword; 2966 castCode += castType.getAsString(); 2967 castCode += ")"; 2968 Expr *castedE = castExpr->IgnoreImpCasts(); 2969 SourceRange range = castedE->getSourceRange(); 2970 if (isa<ParenExpr>(castedE)) { 2971 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(), 2972 castCode)); 2973 } else { 2974 castCode += "("; 2975 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(), 2976 castCode)); 2977 DiagB.AddFixItHint(FixItHint::CreateInsertion( 2978 S.PP.getLocForEndOfToken(range.getEnd()), 2979 ")")); 2980 } 2981 } 2982} 2983 2984static void 2985diagnoseObjCARCConversion(Sema &S, SourceRange castRange, 2986 QualType castType, ARCConversionTypeClass castACTC, 2987 Expr *castExpr, Expr *realCast, 2988 ARCConversionTypeClass exprACTC, 2989 Sema::CheckedConversionKind CCK) { 2990 SourceLocation loc = 2991 (castRange.isValid() ? castRange.getBegin() : castExpr->getExprLoc()); 2992 2993 if (S.makeUnavailableInSystemHeader(loc, 2994 "converts between Objective-C and C pointers in -fobjc-arc")) 2995 return; 2996 2997 QualType castExprType = castExpr->getType(); 2998 2999 unsigned srcKind = 0; 3000 switch (exprACTC) { 3001 case ACTC_none: 3002 case ACTC_coreFoundation: 3003 case ACTC_voidPtr: 3004 srcKind = (castExprType->isPointerType() ? 1 : 0); 3005 break; 3006 case ACTC_retainable: 3007 srcKind = (castExprType->isBlockPointerType() ? 2 : 3); 3008 break; 3009 case ACTC_indirectRetainable: 3010 srcKind = 4; 3011 break; 3012 } 3013 3014 // Check whether this could be fixed with a bridge cast. 3015 SourceLocation afterLParen = S.PP.getLocForEndOfToken(castRange.getBegin()); 3016 SourceLocation noteLoc = afterLParen.isValid() ? afterLParen : loc; 3017 3018 // Bridge from an ARC type to a CF type. 3019 if (castACTC == ACTC_retainable && isAnyRetainable(exprACTC)) { 3020 3021 S.Diag(loc, diag::err_arc_cast_requires_bridge) 3022 << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit 3023 << 2 // of C pointer type 3024 << castExprType 3025 << unsigned(castType->isBlockPointerType()) // to ObjC|block type 3026 << castType 3027 << castRange 3028 << castExpr->getSourceRange(); 3029 bool br = S.isKnownName("CFBridgingRelease"); 3030 ACCResult CreateRule = 3031 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr); 3032 assert(CreateRule != ACC_bottom && "This cast should already be accepted."); 3033 if (CreateRule != ACC_plusOne) 3034 { 3035 DiagnosticBuilder DiagB = 3036 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge) 3037 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge); 3038 3039 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen, 3040 castType, castExpr, realCast, "__bridge ", 0); 3041 } 3042 if (CreateRule != ACC_plusZero) 3043 { 3044 DiagnosticBuilder DiagB = 3045 (CCK == Sema::CCK_OtherCast && !br) ? 3046 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_transfer) << castExprType : 3047 S.Diag(br ? castExpr->getExprLoc() : noteLoc, 3048 diag::note_arc_bridge_transfer) 3049 << castExprType << br; 3050 3051 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen, 3052 castType, castExpr, realCast, "__bridge_transfer ", 3053 br ? "CFBridgingRelease" : 0); 3054 } 3055 3056 return; 3057 } 3058 3059 // Bridge from a CF type to an ARC type. 3060 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC)) { 3061 bool br = S.isKnownName("CFBridgingRetain"); 3062 S.Diag(loc, diag::err_arc_cast_requires_bridge) 3063 << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit 3064 << unsigned(castExprType->isBlockPointerType()) // of ObjC|block type 3065 << castExprType 3066 << 2 // to C pointer type 3067 << castType 3068 << castRange 3069 << castExpr->getSourceRange(); 3070 ACCResult CreateRule = 3071 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr); 3072 assert(CreateRule != ACC_bottom && "This cast should already be accepted."); 3073 if (CreateRule != ACC_plusOne) 3074 { 3075 DiagnosticBuilder DiagB = 3076 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge) 3077 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge); 3078 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen, 3079 castType, castExpr, realCast, "__bridge ", 0); 3080 } 3081 if (CreateRule != ACC_plusZero) 3082 { 3083 DiagnosticBuilder DiagB = 3084 (CCK == Sema::CCK_OtherCast && !br) ? 3085 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_retained) << castType : 3086 S.Diag(br ? castExpr->getExprLoc() : noteLoc, 3087 diag::note_arc_bridge_retained) 3088 << castType << br; 3089 3090 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen, 3091 castType, castExpr, realCast, "__bridge_retained ", 3092 br ? "CFBridgingRetain" : 0); 3093 } 3094 3095 return; 3096 } 3097 3098 S.Diag(loc, diag::err_arc_mismatched_cast) 3099 << (CCK != Sema::CCK_ImplicitConversion) 3100 << srcKind << castExprType << castType 3101 << castRange << castExpr->getSourceRange(); 3102} 3103 3104Sema::ARCConversionResult 3105Sema::CheckObjCARCConversion(SourceRange castRange, QualType castType, 3106 Expr *&castExpr, CheckedConversionKind CCK) { 3107 QualType castExprType = castExpr->getType(); 3108 3109 // For the purposes of the classification, we assume reference types 3110 // will bind to temporaries. 3111 QualType effCastType = castType; 3112 if (const ReferenceType *ref = castType->getAs<ReferenceType>()) 3113 effCastType = ref->getPointeeType(); 3114 3115 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExprType); 3116 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(effCastType); 3117 if (exprACTC == castACTC) { 3118 // check for viablity and report error if casting an rvalue to a 3119 // life-time qualifier. 3120 if ((castACTC == ACTC_retainable) && 3121 (CCK == CCK_CStyleCast || CCK == CCK_OtherCast) && 3122 (castType != castExprType)) { 3123 const Type *DT = castType.getTypePtr(); 3124 QualType QDT = castType; 3125 // We desugar some types but not others. We ignore those 3126 // that cannot happen in a cast; i.e. auto, and those which 3127 // should not be de-sugared; i.e typedef. 3128 if (const ParenType *PT = dyn_cast<ParenType>(DT)) 3129 QDT = PT->desugar(); 3130 else if (const TypeOfType *TP = dyn_cast<TypeOfType>(DT)) 3131 QDT = TP->desugar(); 3132 else if (const AttributedType *AT = dyn_cast<AttributedType>(DT)) 3133 QDT = AT->desugar(); 3134 if (QDT != castType && 3135 QDT.getObjCLifetime() != Qualifiers::OCL_None) { 3136 SourceLocation loc = 3137 (castRange.isValid() ? castRange.getBegin() 3138 : castExpr->getExprLoc()); 3139 Diag(loc, diag::err_arc_nolifetime_behavior); 3140 } 3141 } 3142 return ACR_okay; 3143 } 3144 3145 if (isAnyCLike(exprACTC) && isAnyCLike(castACTC)) return ACR_okay; 3146 3147 // Allow all of these types to be cast to integer types (but not 3148 // vice-versa). 3149 if (castACTC == ACTC_none && castType->isIntegralType(Context)) 3150 return ACR_okay; 3151 3152 // Allow casts between pointers to lifetime types (e.g., __strong id*) 3153 // and pointers to void (e.g., cv void *). Casting from void* to lifetime* 3154 // must be explicit. 3155 if (exprACTC == ACTC_indirectRetainable && castACTC == ACTC_voidPtr) 3156 return ACR_okay; 3157 if (castACTC == ACTC_indirectRetainable && exprACTC == ACTC_voidPtr && 3158 CCK != CCK_ImplicitConversion) 3159 return ACR_okay; 3160 3161 switch (ARCCastChecker(Context, exprACTC, castACTC, false).Visit(castExpr)) { 3162 // For invalid casts, fall through. 3163 case ACC_invalid: 3164 break; 3165 3166 // Do nothing for both bottom and +0. 3167 case ACC_bottom: 3168 case ACC_plusZero: 3169 return ACR_okay; 3170 3171 // If the result is +1, consume it here. 3172 case ACC_plusOne: 3173 castExpr = ImplicitCastExpr::Create(Context, castExpr->getType(), 3174 CK_ARCConsumeObject, castExpr, 3175 0, VK_RValue); 3176 ExprNeedsCleanups = true; 3177 return ACR_okay; 3178 } 3179 3180 // If this is a non-implicit cast from id or block type to a 3181 // CoreFoundation type, delay complaining in case the cast is used 3182 // in an acceptable context. 3183 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC) && 3184 CCK != CCK_ImplicitConversion) 3185 return ACR_unbridged; 3186 3187 diagnoseObjCARCConversion(*this, castRange, castType, castACTC, 3188 castExpr, castExpr, exprACTC, CCK); 3189 return ACR_okay; 3190} 3191 3192/// Given that we saw an expression with the ARCUnbridgedCastTy 3193/// placeholder type, complain bitterly. 3194void Sema::diagnoseARCUnbridgedCast(Expr *e) { 3195 // We expect the spurious ImplicitCastExpr to already have been stripped. 3196 assert(!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)); 3197 CastExpr *realCast = cast<CastExpr>(e->IgnoreParens()); 3198 3199 SourceRange castRange; 3200 QualType castType; 3201 CheckedConversionKind CCK; 3202 3203 if (CStyleCastExpr *cast = dyn_cast<CStyleCastExpr>(realCast)) { 3204 castRange = SourceRange(cast->getLParenLoc(), cast->getRParenLoc()); 3205 castType = cast->getTypeAsWritten(); 3206 CCK = CCK_CStyleCast; 3207 } else if (ExplicitCastExpr *cast = dyn_cast<ExplicitCastExpr>(realCast)) { 3208 castRange = cast->getTypeInfoAsWritten()->getTypeLoc().getSourceRange(); 3209 castType = cast->getTypeAsWritten(); 3210 CCK = CCK_OtherCast; 3211 } else { 3212 castType = cast->getType(); 3213 CCK = CCK_ImplicitConversion; 3214 } 3215 3216 ARCConversionTypeClass castACTC = 3217 classifyTypeForARCConversion(castType.getNonReferenceType()); 3218 3219 Expr *castExpr = realCast->getSubExpr(); 3220 assert(classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable); 3221 3222 diagnoseObjCARCConversion(*this, castRange, castType, castACTC, 3223 castExpr, realCast, ACTC_retainable, CCK); 3224} 3225 3226/// stripARCUnbridgedCast - Given an expression of ARCUnbridgedCast 3227/// type, remove the placeholder cast. 3228Expr *Sema::stripARCUnbridgedCast(Expr *e) { 3229 assert(e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)); 3230 3231 if (ParenExpr *pe = dyn_cast<ParenExpr>(e)) { 3232 Expr *sub = stripARCUnbridgedCast(pe->getSubExpr()); 3233 return new (Context) ParenExpr(pe->getLParen(), pe->getRParen(), sub); 3234 } else if (UnaryOperator *uo = dyn_cast<UnaryOperator>(e)) { 3235 assert(uo->getOpcode() == UO_Extension); 3236 Expr *sub = stripARCUnbridgedCast(uo->getSubExpr()); 3237 return new (Context) UnaryOperator(sub, UO_Extension, sub->getType(), 3238 sub->getValueKind(), sub->getObjectKind(), 3239 uo->getOperatorLoc()); 3240 } else if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) { 3241 assert(!gse->isResultDependent()); 3242 3243 unsigned n = gse->getNumAssocs(); 3244 SmallVector<Expr*, 4> subExprs(n); 3245 SmallVector<TypeSourceInfo*, 4> subTypes(n); 3246 for (unsigned i = 0; i != n; ++i) { 3247 subTypes[i] = gse->getAssocTypeSourceInfo(i); 3248 Expr *sub = gse->getAssocExpr(i); 3249 if (i == gse->getResultIndex()) 3250 sub = stripARCUnbridgedCast(sub); 3251 subExprs[i] = sub; 3252 } 3253 3254 return new (Context) GenericSelectionExpr(Context, gse->getGenericLoc(), 3255 gse->getControllingExpr(), 3256 subTypes, subExprs, 3257 gse->getDefaultLoc(), 3258 gse->getRParenLoc(), 3259 gse->containsUnexpandedParameterPack(), 3260 gse->getResultIndex()); 3261 } else { 3262 assert(isa<ImplicitCastExpr>(e) && "bad form of unbridged cast!"); 3263 return cast<ImplicitCastExpr>(e)->getSubExpr(); 3264 } 3265} 3266 3267bool Sema::CheckObjCARCUnavailableWeakConversion(QualType castType, 3268 QualType exprType) { 3269 QualType canCastType = 3270 Context.getCanonicalType(castType).getUnqualifiedType(); 3271 QualType canExprType = 3272 Context.getCanonicalType(exprType).getUnqualifiedType(); 3273 if (isa<ObjCObjectPointerType>(canCastType) && 3274 castType.getObjCLifetime() == Qualifiers::OCL_Weak && 3275 canExprType->isObjCObjectPointerType()) { 3276 if (const ObjCObjectPointerType *ObjT = 3277 canExprType->getAs<ObjCObjectPointerType>()) 3278 if (const ObjCInterfaceDecl *ObjI = ObjT->getInterfaceDecl()) 3279 return !ObjI->isArcWeakrefUnavailable(); 3280 } 3281 return true; 3282} 3283 3284/// Look for an ObjCReclaimReturnedObject cast and destroy it. 3285static Expr *maybeUndoReclaimObject(Expr *e) { 3286 // For now, we just undo operands that are *immediately* reclaim 3287 // expressions, which prevents the vast majority of potential 3288 // problems here. To catch them all, we'd need to rebuild arbitrary 3289 // value-propagating subexpressions --- we can't reliably rebuild 3290 // in-place because of expression sharing. 3291 if (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 3292 if (ice->getCastKind() == CK_ARCReclaimReturnedObject) 3293 return ice->getSubExpr(); 3294 3295 return e; 3296} 3297 3298ExprResult Sema::BuildObjCBridgedCast(SourceLocation LParenLoc, 3299 ObjCBridgeCastKind Kind, 3300 SourceLocation BridgeKeywordLoc, 3301 TypeSourceInfo *TSInfo, 3302 Expr *SubExpr) { 3303 ExprResult SubResult = UsualUnaryConversions(SubExpr); 3304 if (SubResult.isInvalid()) return ExprError(); 3305 SubExpr = SubResult.take(); 3306 3307 QualType T = TSInfo->getType(); 3308 QualType FromType = SubExpr->getType(); 3309 3310 CastKind CK; 3311 3312 bool MustConsume = false; 3313 if (T->isDependentType() || SubExpr->isTypeDependent()) { 3314 // Okay: we'll build a dependent expression type. 3315 CK = CK_Dependent; 3316 } else if (T->isObjCARCBridgableType() && FromType->isCARCBridgableType()) { 3317 // Casting CF -> id 3318 CK = (T->isBlockPointerType() ? CK_AnyPointerToBlockPointerCast 3319 : CK_CPointerToObjCPointerCast); 3320 switch (Kind) { 3321 case OBC_Bridge: 3322 break; 3323 3324 case OBC_BridgeRetained: { 3325 bool br = isKnownName("CFBridgingRelease"); 3326 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind) 3327 << 2 3328 << FromType 3329 << (T->isBlockPointerType()? 1 : 0) 3330 << T 3331 << SubExpr->getSourceRange() 3332 << Kind; 3333 Diag(BridgeKeywordLoc, diag::note_arc_bridge) 3334 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge"); 3335 Diag(BridgeKeywordLoc, diag::note_arc_bridge_transfer) 3336 << FromType << br 3337 << FixItHint::CreateReplacement(BridgeKeywordLoc, 3338 br ? "CFBridgingRelease " 3339 : "__bridge_transfer "); 3340 3341 Kind = OBC_Bridge; 3342 break; 3343 } 3344 3345 case OBC_BridgeTransfer: 3346 // We must consume the Objective-C object produced by the cast. 3347 MustConsume = true; 3348 break; 3349 } 3350 } else if (T->isCARCBridgableType() && FromType->isObjCARCBridgableType()) { 3351 // Okay: id -> CF 3352 CK = CK_BitCast; 3353 switch (Kind) { 3354 case OBC_Bridge: 3355 // Reclaiming a value that's going to be __bridge-casted to CF 3356 // is very dangerous, so we don't do it. 3357 SubExpr = maybeUndoReclaimObject(SubExpr); 3358 break; 3359 3360 case OBC_BridgeRetained: 3361 // Produce the object before casting it. 3362 SubExpr = ImplicitCastExpr::Create(Context, FromType, 3363 CK_ARCProduceObject, 3364 SubExpr, 0, VK_RValue); 3365 break; 3366 3367 case OBC_BridgeTransfer: { 3368 bool br = isKnownName("CFBridgingRetain"); 3369 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind) 3370 << (FromType->isBlockPointerType()? 1 : 0) 3371 << FromType 3372 << 2 3373 << T 3374 << SubExpr->getSourceRange() 3375 << Kind; 3376 3377 Diag(BridgeKeywordLoc, diag::note_arc_bridge) 3378 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge "); 3379 Diag(BridgeKeywordLoc, diag::note_arc_bridge_retained) 3380 << T << br 3381 << FixItHint::CreateReplacement(BridgeKeywordLoc, 3382 br ? "CFBridgingRetain " : "__bridge_retained"); 3383 3384 Kind = OBC_Bridge; 3385 break; 3386 } 3387 } 3388 } else { 3389 Diag(LParenLoc, diag::err_arc_bridge_cast_incompatible) 3390 << FromType << T << Kind 3391 << SubExpr->getSourceRange() 3392 << TSInfo->getTypeLoc().getSourceRange(); 3393 return ExprError(); 3394 } 3395 3396 Expr *Result = new (Context) ObjCBridgedCastExpr(LParenLoc, Kind, CK, 3397 BridgeKeywordLoc, 3398 TSInfo, SubExpr); 3399 3400 if (MustConsume) { 3401 ExprNeedsCleanups = true; 3402 Result = ImplicitCastExpr::Create(Context, T, CK_ARCConsumeObject, Result, 3403 0, VK_RValue); 3404 } 3405 3406 return Result; 3407} 3408 3409ExprResult Sema::ActOnObjCBridgedCast(Scope *S, 3410 SourceLocation LParenLoc, 3411 ObjCBridgeCastKind Kind, 3412 SourceLocation BridgeKeywordLoc, 3413 ParsedType Type, 3414 SourceLocation RParenLoc, 3415 Expr *SubExpr) { 3416 TypeSourceInfo *TSInfo = 0; 3417 QualType T = GetTypeFromParser(Type, &TSInfo); 3418 if (!TSInfo) 3419 TSInfo = Context.getTrivialTypeSourceInfo(T, LParenLoc); 3420 return BuildObjCBridgedCast(LParenLoc, Kind, BridgeKeywordLoc, TSInfo, 3421 SubExpr); 3422} 3423