SemaExprObjC.cpp revision d2d065545ba7b4349ae02afe07f799047443f1a0
1//===--- SemaExprObjC.cpp - Semantic Analysis for ObjC Expressions --------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for Objective-C expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Lookup.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/ScopeInfo.h" 18#include "clang/Sema/Initialization.h" 19#include "clang/Analysis/DomainSpecific/CocoaConventions.h" 20#include "clang/Edit/Rewriters.h" 21#include "clang/Edit/Commit.h" 22#include "clang/AST/ASTContext.h" 23#include "clang/AST/DeclObjC.h" 24#include "clang/AST/ExprObjC.h" 25#include "clang/AST/StmtVisitor.h" 26#include "clang/AST/TypeLoc.h" 27#include "llvm/ADT/SmallString.h" 28#include "clang/Lex/Preprocessor.h" 29 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 llvm::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 /*isSynthesized=*/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 SC_None, 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, MultiExprArg(S, &Element, 1)); 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 /*isSynthesized=*/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, 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 } 543 544 if (!BoxingMethod) { 545 Diag(SR.getBegin(), diag::err_objc_illegal_boxed_expression_type) 546 << ValueType << ValueExpr->getSourceRange(); 547 return ExprError(); 548 } 549 550 // Convert the expression to the type that the parameter requires. 551 ParmVarDecl *ParamDecl = BoxingMethod->param_begin()[0]; 552 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 553 ParamDecl); 554 ExprResult ConvertedValueExpr = PerformCopyInitialization(Entity, 555 SourceLocation(), 556 Owned(ValueExpr)); 557 if (ConvertedValueExpr.isInvalid()) 558 return ExprError(); 559 ValueExpr = ConvertedValueExpr.get(); 560 561 ObjCBoxedExpr *BoxedExpr = 562 new (Context) ObjCBoxedExpr(ValueExpr, BoxedType, 563 BoxingMethod, SR); 564 return MaybeBindToTemporary(BoxedExpr); 565} 566 567ExprResult Sema::BuildObjCSubscriptExpression(SourceLocation RB, Expr *BaseExpr, 568 Expr *IndexExpr, 569 ObjCMethodDecl *getterMethod, 570 ObjCMethodDecl *setterMethod) { 571 // Feature support is for modern abi. 572 if (!LangOpts.ObjCNonFragileABI) 573 return ExprError(); 574 // If the expression is type-dependent, there's nothing for us to do. 575 assert ((!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) && 576 "base or index cannot have dependent type here"); 577 ExprResult Result = CheckPlaceholderExpr(IndexExpr); 578 if (Result.isInvalid()) 579 return ExprError(); 580 IndexExpr = Result.get(); 581 582 // Perform lvalue-to-rvalue conversion. 583 Result = DefaultLvalueConversion(BaseExpr); 584 if (Result.isInvalid()) 585 return ExprError(); 586 BaseExpr = Result.get(); 587 return Owned(ObjCSubscriptRefExpr::Create(Context, 588 BaseExpr, 589 IndexExpr, 590 Context.PseudoObjectTy, 591 getterMethod, 592 setterMethod, RB)); 593 594} 595 596ExprResult Sema::BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements) { 597 // Look up the NSArray class, if we haven't done so already. 598 if (!NSArrayDecl) { 599 NamedDecl *IF = LookupSingleName(TUScope, 600 NSAPIObj->getNSClassId(NSAPI::ClassId_NSArray), 601 SR.getBegin(), 602 LookupOrdinaryName); 603 NSArrayDecl = dyn_cast_or_null<ObjCInterfaceDecl>(IF); 604 if (!NSArrayDecl && getLangOpts().DebuggerObjCLiteral) 605 NSArrayDecl = ObjCInterfaceDecl::Create (Context, 606 Context.getTranslationUnitDecl(), 607 SourceLocation(), 608 NSAPIObj->getNSClassId(NSAPI::ClassId_NSArray), 609 0, SourceLocation()); 610 611 if (!NSArrayDecl) { 612 Diag(SR.getBegin(), diag::err_undeclared_nsarray); 613 return ExprError(); 614 } 615 } 616 617 // Find the arrayWithObjects:count: method, if we haven't done so already. 618 QualType IdT = Context.getObjCIdType(); 619 if (!ArrayWithObjectsMethod) { 620 Selector 621 Sel = NSAPIObj->getNSArraySelector(NSAPI::NSArr_arrayWithObjectsCount); 622 ObjCMethodDecl *Method = NSArrayDecl->lookupClassMethod(Sel); 623 if (!Method && getLangOpts().DebuggerObjCLiteral) { 624 TypeSourceInfo *ResultTInfo = 0; 625 Method = ObjCMethodDecl::Create(Context, 626 SourceLocation(), SourceLocation(), Sel, 627 IdT, 628 ResultTInfo, 629 Context.getTranslationUnitDecl(), 630 false /*Instance*/, false/*isVariadic*/, 631 /*isSynthesized=*/false, 632 /*isImplicitlyDeclared=*/true, /*isDefined=*/false, 633 ObjCMethodDecl::Required, 634 false); 635 SmallVector<ParmVarDecl *, 2> Params; 636 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method, 637 SourceLocation(), 638 SourceLocation(), 639 &Context.Idents.get("objects"), 640 Context.getPointerType(IdT), 641 /*TInfo=*/0, SC_None, SC_None, 642 0); 643 Params.push_back(objects); 644 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method, 645 SourceLocation(), 646 SourceLocation(), 647 &Context.Idents.get("cnt"), 648 Context.UnsignedLongTy, 649 /*TInfo=*/0, SC_None, SC_None, 650 0); 651 Params.push_back(cnt); 652 Method->setMethodParams(Context, Params, ArrayRef<SourceLocation>()); 653 } 654 655 if (!validateBoxingMethod(*this, SR.getBegin(), NSArrayDecl, Sel, Method)) 656 return ExprError(); 657 658 ArrayWithObjectsMethod = Method; 659 } 660 661 // Dig out the type that all elements should be converted to. 662 QualType T = ArrayWithObjectsMethod->param_begin()[0]->getType(); 663 const PointerType *PtrT = T->getAs<PointerType>(); 664 if (!PtrT || 665 !Context.hasSameUnqualifiedType(PtrT->getPointeeType(), IdT)) { 666 Diag(SR.getBegin(), diag::err_objc_literal_method_sig) 667 << ArrayWithObjectsMethod->getSelector(); 668 Diag(ArrayWithObjectsMethod->param_begin()[0]->getLocation(), 669 diag::note_objc_literal_method_param) 670 << 0 << T 671 << Context.getPointerType(IdT.withConst()); 672 return ExprError(); 673 } 674 T = PtrT->getPointeeType(); 675 676 // Check that the 'count' parameter is integral. 677 if (!ArrayWithObjectsMethod->param_begin()[1]->getType()->isIntegerType()) { 678 Diag(SR.getBegin(), diag::err_objc_literal_method_sig) 679 << ArrayWithObjectsMethod->getSelector(); 680 Diag(ArrayWithObjectsMethod->param_begin()[1]->getLocation(), 681 diag::note_objc_literal_method_param) 682 << 1 683 << ArrayWithObjectsMethod->param_begin()[1]->getType() 684 << "integral"; 685 return ExprError(); 686 } 687 688 // Check that each of the elements provided is valid in a collection literal, 689 // performing conversions as necessary. 690 Expr **ElementsBuffer = Elements.get(); 691 for (unsigned I = 0, N = Elements.size(); I != N; ++I) { 692 ExprResult Converted = CheckObjCCollectionLiteralElement(*this, 693 ElementsBuffer[I], 694 T); 695 if (Converted.isInvalid()) 696 return ExprError(); 697 698 ElementsBuffer[I] = Converted.get(); 699 } 700 701 QualType Ty 702 = Context.getObjCObjectPointerType( 703 Context.getObjCInterfaceType(NSArrayDecl)); 704 705 return MaybeBindToTemporary( 706 ObjCArrayLiteral::Create(Context, 707 llvm::makeArrayRef(Elements.get(), 708 Elements.size()), 709 Ty, ArrayWithObjectsMethod, SR)); 710} 711 712ExprResult Sema::BuildObjCDictionaryLiteral(SourceRange SR, 713 ObjCDictionaryElement *Elements, 714 unsigned NumElements) { 715 // Look up the NSDictionary class, if we haven't done so already. 716 if (!NSDictionaryDecl) { 717 NamedDecl *IF = LookupSingleName(TUScope, 718 NSAPIObj->getNSClassId(NSAPI::ClassId_NSDictionary), 719 SR.getBegin(), LookupOrdinaryName); 720 NSDictionaryDecl = dyn_cast_or_null<ObjCInterfaceDecl>(IF); 721 if (!NSDictionaryDecl && getLangOpts().DebuggerObjCLiteral) 722 NSDictionaryDecl = ObjCInterfaceDecl::Create (Context, 723 Context.getTranslationUnitDecl(), 724 SourceLocation(), 725 NSAPIObj->getNSClassId(NSAPI::ClassId_NSDictionary), 726 0, SourceLocation()); 727 728 if (!NSDictionaryDecl) { 729 Diag(SR.getBegin(), diag::err_undeclared_nsdictionary); 730 return ExprError(); 731 } 732 } 733 734 // Find the dictionaryWithObjects:forKeys:count: method, if we haven't done 735 // so already. 736 QualType IdT = Context.getObjCIdType(); 737 if (!DictionaryWithObjectsMethod) { 738 Selector Sel = NSAPIObj->getNSDictionarySelector( 739 NSAPI::NSDict_dictionaryWithObjectsForKeysCount); 740 ObjCMethodDecl *Method = NSDictionaryDecl->lookupClassMethod(Sel); 741 if (!Method && getLangOpts().DebuggerObjCLiteral) { 742 Method = ObjCMethodDecl::Create(Context, 743 SourceLocation(), SourceLocation(), Sel, 744 IdT, 745 0 /*TypeSourceInfo */, 746 Context.getTranslationUnitDecl(), 747 false /*Instance*/, false/*isVariadic*/, 748 /*isSynthesized=*/false, 749 /*isImplicitlyDeclared=*/true, /*isDefined=*/false, 750 ObjCMethodDecl::Required, 751 false); 752 SmallVector<ParmVarDecl *, 3> Params; 753 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method, 754 SourceLocation(), 755 SourceLocation(), 756 &Context.Idents.get("objects"), 757 Context.getPointerType(IdT), 758 /*TInfo=*/0, SC_None, SC_None, 759 0); 760 Params.push_back(objects); 761 ParmVarDecl *keys = ParmVarDecl::Create(Context, Method, 762 SourceLocation(), 763 SourceLocation(), 764 &Context.Idents.get("keys"), 765 Context.getPointerType(IdT), 766 /*TInfo=*/0, SC_None, SC_None, 767 0); 768 Params.push_back(keys); 769 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method, 770 SourceLocation(), 771 SourceLocation(), 772 &Context.Idents.get("cnt"), 773 Context.UnsignedLongTy, 774 /*TInfo=*/0, SC_None, SC_None, 775 0); 776 Params.push_back(cnt); 777 Method->setMethodParams(Context, Params, ArrayRef<SourceLocation>()); 778 } 779 780 if (!validateBoxingMethod(*this, SR.getBegin(), NSDictionaryDecl, Sel, 781 Method)) 782 return ExprError(); 783 784 DictionaryWithObjectsMethod = Method; 785 } 786 787 // Dig out the type that all values should be converted to. 788 QualType ValueT = DictionaryWithObjectsMethod->param_begin()[0]->getType(); 789 const PointerType *PtrValue = ValueT->getAs<PointerType>(); 790 if (!PtrValue || 791 !Context.hasSameUnqualifiedType(PtrValue->getPointeeType(), IdT)) { 792 Diag(SR.getBegin(), diag::err_objc_literal_method_sig) 793 << DictionaryWithObjectsMethod->getSelector(); 794 Diag(DictionaryWithObjectsMethod->param_begin()[0]->getLocation(), 795 diag::note_objc_literal_method_param) 796 << 0 << ValueT 797 << Context.getPointerType(IdT.withConst()); 798 return ExprError(); 799 } 800 ValueT = PtrValue->getPointeeType(); 801 802 // Dig out the type that all keys should be converted to. 803 QualType KeyT = DictionaryWithObjectsMethod->param_begin()[1]->getType(); 804 const PointerType *PtrKey = KeyT->getAs<PointerType>(); 805 if (!PtrKey || 806 !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(), 807 IdT)) { 808 bool err = true; 809 if (PtrKey) { 810 if (QIDNSCopying.isNull()) { 811 // key argument of selector is id<NSCopying>? 812 if (ObjCProtocolDecl *NSCopyingPDecl = 813 LookupProtocol(&Context.Idents.get("NSCopying"), SR.getBegin())) { 814 ObjCProtocolDecl *PQ[] = {NSCopyingPDecl}; 815 QIDNSCopying = 816 Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 817 (ObjCProtocolDecl**) PQ,1); 818 QIDNSCopying = Context.getObjCObjectPointerType(QIDNSCopying); 819 } 820 } 821 if (!QIDNSCopying.isNull()) 822 err = !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(), 823 QIDNSCopying); 824 } 825 826 if (err) { 827 Diag(SR.getBegin(), diag::err_objc_literal_method_sig) 828 << DictionaryWithObjectsMethod->getSelector(); 829 Diag(DictionaryWithObjectsMethod->param_begin()[1]->getLocation(), 830 diag::note_objc_literal_method_param) 831 << 1 << KeyT 832 << Context.getPointerType(IdT.withConst()); 833 return ExprError(); 834 } 835 } 836 KeyT = PtrKey->getPointeeType(); 837 838 // Check that the 'count' parameter is integral. 839 if (!DictionaryWithObjectsMethod->param_begin()[2]->getType() 840 ->isIntegerType()) { 841 Diag(SR.getBegin(), diag::err_objc_literal_method_sig) 842 << DictionaryWithObjectsMethod->getSelector(); 843 Diag(DictionaryWithObjectsMethod->param_begin()[2]->getLocation(), 844 diag::note_objc_literal_method_param) 845 << 2 846 << DictionaryWithObjectsMethod->param_begin()[2]->getType() 847 << "integral"; 848 return ExprError(); 849 } 850 851 // Check that each of the keys and values provided is valid in a collection 852 // literal, performing conversions as necessary. 853 bool HasPackExpansions = false; 854 for (unsigned I = 0, N = NumElements; I != N; ++I) { 855 // Check the key. 856 ExprResult Key = CheckObjCCollectionLiteralElement(*this, Elements[I].Key, 857 KeyT); 858 if (Key.isInvalid()) 859 return ExprError(); 860 861 // Check the value. 862 ExprResult Value 863 = CheckObjCCollectionLiteralElement(*this, Elements[I].Value, ValueT); 864 if (Value.isInvalid()) 865 return ExprError(); 866 867 Elements[I].Key = Key.get(); 868 Elements[I].Value = Value.get(); 869 870 if (Elements[I].EllipsisLoc.isInvalid()) 871 continue; 872 873 if (!Elements[I].Key->containsUnexpandedParameterPack() && 874 !Elements[I].Value->containsUnexpandedParameterPack()) { 875 Diag(Elements[I].EllipsisLoc, 876 diag::err_pack_expansion_without_parameter_packs) 877 << SourceRange(Elements[I].Key->getLocStart(), 878 Elements[I].Value->getLocEnd()); 879 return ExprError(); 880 } 881 882 HasPackExpansions = true; 883 } 884 885 886 QualType Ty 887 = Context.getObjCObjectPointerType( 888 Context.getObjCInterfaceType(NSDictionaryDecl)); 889 return MaybeBindToTemporary( 890 ObjCDictionaryLiteral::Create(Context, 891 llvm::makeArrayRef(Elements, 892 NumElements), 893 HasPackExpansions, 894 Ty, 895 DictionaryWithObjectsMethod, SR)); 896} 897 898ExprResult Sema::BuildObjCEncodeExpression(SourceLocation AtLoc, 899 TypeSourceInfo *EncodedTypeInfo, 900 SourceLocation RParenLoc) { 901 QualType EncodedType = EncodedTypeInfo->getType(); 902 QualType StrTy; 903 if (EncodedType->isDependentType()) 904 StrTy = Context.DependentTy; 905 else { 906 if (!EncodedType->getAsArrayTypeUnsafe() && //// Incomplete array is handled. 907 !EncodedType->isVoidType()) // void is handled too. 908 if (RequireCompleteType(AtLoc, EncodedType, 909 diag::err_incomplete_type_objc_at_encode, 910 EncodedTypeInfo->getTypeLoc())) 911 return ExprError(); 912 913 std::string Str; 914 Context.getObjCEncodingForType(EncodedType, Str); 915 916 // The type of @encode is the same as the type of the corresponding string, 917 // which is an array type. 918 StrTy = Context.CharTy; 919 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 920 if (getLangOpts().CPlusPlus || getLangOpts().ConstStrings) 921 StrTy.addConst(); 922 StrTy = Context.getConstantArrayType(StrTy, llvm::APInt(32, Str.size()+1), 923 ArrayType::Normal, 0); 924 } 925 926 return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc); 927} 928 929ExprResult Sema::ParseObjCEncodeExpression(SourceLocation AtLoc, 930 SourceLocation EncodeLoc, 931 SourceLocation LParenLoc, 932 ParsedType ty, 933 SourceLocation RParenLoc) { 934 // FIXME: Preserve type source info ? 935 TypeSourceInfo *TInfo; 936 QualType EncodedType = GetTypeFromParser(ty, &TInfo); 937 if (!TInfo) 938 TInfo = Context.getTrivialTypeSourceInfo(EncodedType, 939 PP.getLocForEndOfToken(LParenLoc)); 940 941 return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc); 942} 943 944ExprResult Sema::ParseObjCSelectorExpression(Selector Sel, 945 SourceLocation AtLoc, 946 SourceLocation SelLoc, 947 SourceLocation LParenLoc, 948 SourceLocation RParenLoc) { 949 ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel, 950 SourceRange(LParenLoc, RParenLoc), false, false); 951 if (!Method) 952 Method = LookupFactoryMethodInGlobalPool(Sel, 953 SourceRange(LParenLoc, RParenLoc)); 954 if (!Method) 955 Diag(SelLoc, diag::warn_undeclared_selector) << Sel; 956 957 if (!Method || 958 Method->getImplementationControl() != ObjCMethodDecl::Optional) { 959 llvm::DenseMap<Selector, SourceLocation>::iterator Pos 960 = ReferencedSelectors.find(Sel); 961 if (Pos == ReferencedSelectors.end()) 962 ReferencedSelectors.insert(std::make_pair(Sel, SelLoc)); 963 } 964 965 // In ARC, forbid the user from using @selector for 966 // retain/release/autorelease/dealloc/retainCount. 967 if (getLangOpts().ObjCAutoRefCount) { 968 switch (Sel.getMethodFamily()) { 969 case OMF_retain: 970 case OMF_release: 971 case OMF_autorelease: 972 case OMF_retainCount: 973 case OMF_dealloc: 974 Diag(AtLoc, diag::err_arc_illegal_selector) << 975 Sel << SourceRange(LParenLoc, RParenLoc); 976 break; 977 978 case OMF_None: 979 case OMF_alloc: 980 case OMF_copy: 981 case OMF_finalize: 982 case OMF_init: 983 case OMF_mutableCopy: 984 case OMF_new: 985 case OMF_self: 986 case OMF_performSelector: 987 break; 988 } 989 } 990 QualType Ty = Context.getObjCSelType(); 991 return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc); 992} 993 994ExprResult Sema::ParseObjCProtocolExpression(IdentifierInfo *ProtocolId, 995 SourceLocation AtLoc, 996 SourceLocation ProtoLoc, 997 SourceLocation LParenLoc, 998 SourceLocation RParenLoc) { 999 ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoLoc); 1000 if (!PDecl) { 1001 Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId; 1002 return true; 1003 } 1004 1005 QualType Ty = Context.getObjCProtoType(); 1006 if (Ty.isNull()) 1007 return true; 1008 Ty = Context.getObjCObjectPointerType(Ty); 1009 return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, RParenLoc); 1010} 1011 1012/// Try to capture an implicit reference to 'self'. 1013ObjCMethodDecl *Sema::tryCaptureObjCSelf(SourceLocation Loc) { 1014 DeclContext *DC = getFunctionLevelDeclContext(); 1015 1016 // If we're not in an ObjC method, error out. Note that, unlike the 1017 // C++ case, we don't require an instance method --- class methods 1018 // still have a 'self', and we really do still need to capture it! 1019 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(DC); 1020 if (!method) 1021 return 0; 1022 1023 tryCaptureVariable(method->getSelfDecl(), Loc); 1024 1025 return method; 1026} 1027 1028static QualType stripObjCInstanceType(ASTContext &Context, QualType T) { 1029 if (T == Context.getObjCInstanceType()) 1030 return Context.getObjCIdType(); 1031 1032 return T; 1033} 1034 1035QualType Sema::getMessageSendResultType(QualType ReceiverType, 1036 ObjCMethodDecl *Method, 1037 bool isClassMessage, bool isSuperMessage) { 1038 assert(Method && "Must have a method"); 1039 if (!Method->hasRelatedResultType()) 1040 return Method->getSendResultType(); 1041 1042 // If a method has a related return type: 1043 // - if the method found is an instance method, but the message send 1044 // was a class message send, T is the declared return type of the method 1045 // found 1046 if (Method->isInstanceMethod() && isClassMessage) 1047 return stripObjCInstanceType(Context, Method->getSendResultType()); 1048 1049 // - if the receiver is super, T is a pointer to the class of the 1050 // enclosing method definition 1051 if (isSuperMessage) { 1052 if (ObjCMethodDecl *CurMethod = getCurMethodDecl()) 1053 if (ObjCInterfaceDecl *Class = CurMethod->getClassInterface()) 1054 return Context.getObjCObjectPointerType( 1055 Context.getObjCInterfaceType(Class)); 1056 } 1057 1058 // - if the receiver is the name of a class U, T is a pointer to U 1059 if (ReceiverType->getAs<ObjCInterfaceType>() || 1060 ReceiverType->isObjCQualifiedInterfaceType()) 1061 return Context.getObjCObjectPointerType(ReceiverType); 1062 // - if the receiver is of type Class or qualified Class type, 1063 // T is the declared return type of the method. 1064 if (ReceiverType->isObjCClassType() || 1065 ReceiverType->isObjCQualifiedClassType()) 1066 return stripObjCInstanceType(Context, Method->getSendResultType()); 1067 1068 // - if the receiver is id, qualified id, Class, or qualified Class, T 1069 // is the receiver type, otherwise 1070 // - T is the type of the receiver expression. 1071 return ReceiverType; 1072} 1073 1074void Sema::EmitRelatedResultTypeNote(const Expr *E) { 1075 E = E->IgnoreParenImpCasts(); 1076 const ObjCMessageExpr *MsgSend = dyn_cast<ObjCMessageExpr>(E); 1077 if (!MsgSend) 1078 return; 1079 1080 const ObjCMethodDecl *Method = MsgSend->getMethodDecl(); 1081 if (!Method) 1082 return; 1083 1084 if (!Method->hasRelatedResultType()) 1085 return; 1086 1087 if (Context.hasSameUnqualifiedType(Method->getResultType() 1088 .getNonReferenceType(), 1089 MsgSend->getType())) 1090 return; 1091 1092 if (!Context.hasSameUnqualifiedType(Method->getResultType(), 1093 Context.getObjCInstanceType())) 1094 return; 1095 1096 Diag(Method->getLocation(), diag::note_related_result_type_inferred) 1097 << Method->isInstanceMethod() << Method->getSelector() 1098 << MsgSend->getType(); 1099} 1100 1101bool Sema::CheckMessageArgumentTypes(QualType ReceiverType, 1102 Expr **Args, unsigned NumArgs, 1103 Selector Sel, ObjCMethodDecl *Method, 1104 bool isClassMessage, bool isSuperMessage, 1105 SourceLocation lbrac, SourceLocation rbrac, 1106 QualType &ReturnType, ExprValueKind &VK) { 1107 if (!Method) { 1108 // Apply default argument promotion as for (C99 6.5.2.2p6). 1109 for (unsigned i = 0; i != NumArgs; i++) { 1110 if (Args[i]->isTypeDependent()) 1111 continue; 1112 1113 ExprResult Result = DefaultArgumentPromotion(Args[i]); 1114 if (Result.isInvalid()) 1115 return true; 1116 Args[i] = Result.take(); 1117 } 1118 1119 unsigned DiagID; 1120 if (getLangOpts().ObjCAutoRefCount) 1121 DiagID = diag::err_arc_method_not_found; 1122 else 1123 DiagID = isClassMessage ? diag::warn_class_method_not_found 1124 : diag::warn_inst_method_not_found; 1125 if (!getLangOpts().DebuggerSupport) 1126 Diag(lbrac, DiagID) 1127 << Sel << isClassMessage << SourceRange(lbrac, rbrac); 1128 1129 // In debuggers, we want to use __unknown_anytype for these 1130 // results so that clients can cast them. 1131 if (getLangOpts().DebuggerSupport) { 1132 ReturnType = Context.UnknownAnyTy; 1133 } else { 1134 ReturnType = Context.getObjCIdType(); 1135 } 1136 VK = VK_RValue; 1137 return false; 1138 } 1139 1140 ReturnType = getMessageSendResultType(ReceiverType, Method, isClassMessage, 1141 isSuperMessage); 1142 VK = Expr::getValueKindForType(Method->getResultType()); 1143 1144 unsigned NumNamedArgs = Sel.getNumArgs(); 1145 // Method might have more arguments than selector indicates. This is due 1146 // to addition of c-style arguments in method. 1147 if (Method->param_size() > Sel.getNumArgs()) 1148 NumNamedArgs = Method->param_size(); 1149 // FIXME. This need be cleaned up. 1150 if (NumArgs < NumNamedArgs) { 1151 Diag(lbrac, diag::err_typecheck_call_too_few_args) 1152 << 2 << NumNamedArgs << NumArgs; 1153 return false; 1154 } 1155 1156 bool IsError = false; 1157 for (unsigned i = 0; i < NumNamedArgs; i++) { 1158 // We can't do any type-checking on a type-dependent argument. 1159 if (Args[i]->isTypeDependent()) 1160 continue; 1161 1162 Expr *argExpr = Args[i]; 1163 1164 ParmVarDecl *param = Method->param_begin()[i]; 1165 assert(argExpr && "CheckMessageArgumentTypes(): missing expression"); 1166 1167 // Strip the unbridged-cast placeholder expression off unless it's 1168 // a consumed argument. 1169 if (argExpr->hasPlaceholderType(BuiltinType::ARCUnbridgedCast) && 1170 !param->hasAttr<CFConsumedAttr>()) 1171 argExpr = stripARCUnbridgedCast(argExpr); 1172 1173 if (RequireCompleteType(argExpr->getSourceRange().getBegin(), 1174 param->getType(), 1175 diag::err_call_incomplete_argument, argExpr)) 1176 return true; 1177 1178 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 1179 param); 1180 ExprResult ArgE = PerformCopyInitialization(Entity, lbrac, Owned(argExpr)); 1181 if (ArgE.isInvalid()) 1182 IsError = true; 1183 else 1184 Args[i] = ArgE.takeAs<Expr>(); 1185 } 1186 1187 // Promote additional arguments to variadic methods. 1188 if (Method->isVariadic()) { 1189 for (unsigned i = NumNamedArgs; i < NumArgs; ++i) { 1190 if (Args[i]->isTypeDependent()) 1191 continue; 1192 1193 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod, 1194 0); 1195 IsError |= Arg.isInvalid(); 1196 Args[i] = Arg.take(); 1197 } 1198 } else { 1199 // Check for extra arguments to non-variadic methods. 1200 if (NumArgs != NumNamedArgs) { 1201 Diag(Args[NumNamedArgs]->getLocStart(), 1202 diag::err_typecheck_call_too_many_args) 1203 << 2 /*method*/ << NumNamedArgs << NumArgs 1204 << Method->getSourceRange() 1205 << SourceRange(Args[NumNamedArgs]->getLocStart(), 1206 Args[NumArgs-1]->getLocEnd()); 1207 } 1208 } 1209 1210 DiagnoseSentinelCalls(Method, lbrac, Args, NumArgs); 1211 1212 // Do additional checkings on method. 1213 IsError |= CheckObjCMethodCall(Method, lbrac, Args, NumArgs); 1214 1215 return IsError; 1216} 1217 1218bool Sema::isSelfExpr(Expr *receiver) { 1219 // 'self' is objc 'self' in an objc method only. 1220 ObjCMethodDecl *method = 1221 dyn_cast<ObjCMethodDecl>(CurContext->getNonClosureAncestor()); 1222 if (!method) return false; 1223 1224 receiver = receiver->IgnoreParenLValueCasts(); 1225 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(receiver)) 1226 if (DRE->getDecl() == method->getSelfDecl()) 1227 return true; 1228 return false; 1229} 1230 1231// Helper method for ActOnClassMethod/ActOnInstanceMethod. 1232// Will search "local" class/category implementations for a method decl. 1233// If failed, then we search in class's root for an instance method. 1234// Returns 0 if no method is found. 1235ObjCMethodDecl *Sema::LookupPrivateClassMethod(Selector Sel, 1236 ObjCInterfaceDecl *ClassDecl) { 1237 ObjCMethodDecl *Method = 0; 1238 // lookup in class and all superclasses 1239 while (ClassDecl && !Method) { 1240 if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation()) 1241 Method = ImpDecl->getClassMethod(Sel); 1242 1243 // Look through local category implementations associated with the class. 1244 if (!Method) 1245 Method = ClassDecl->getCategoryClassMethod(Sel); 1246 1247 // Before we give up, check if the selector is an instance method. 1248 // But only in the root. This matches gcc's behaviour and what the 1249 // runtime expects. 1250 if (!Method && !ClassDecl->getSuperClass()) { 1251 Method = ClassDecl->lookupInstanceMethod(Sel); 1252 // Look through local category implementations associated 1253 // with the root class. 1254 if (!Method) 1255 Method = LookupPrivateInstanceMethod(Sel, ClassDecl); 1256 } 1257 1258 ClassDecl = ClassDecl->getSuperClass(); 1259 } 1260 return Method; 1261} 1262 1263ObjCMethodDecl *Sema::LookupPrivateInstanceMethod(Selector Sel, 1264 ObjCInterfaceDecl *ClassDecl) { 1265 if (!ClassDecl->hasDefinition()) 1266 return 0; 1267 1268 ObjCMethodDecl *Method = 0; 1269 while (ClassDecl && !Method) { 1270 // If we have implementations in scope, check "private" methods. 1271 if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation()) 1272 Method = ImpDecl->getInstanceMethod(Sel); 1273 1274 // Look through local category implementations associated with the class. 1275 if (!Method) 1276 Method = ClassDecl->getCategoryInstanceMethod(Sel); 1277 ClassDecl = ClassDecl->getSuperClass(); 1278 } 1279 return Method; 1280} 1281 1282/// LookupMethodInType - Look up a method in an ObjCObjectType. 1283ObjCMethodDecl *Sema::LookupMethodInObjectType(Selector sel, QualType type, 1284 bool isInstance) { 1285 const ObjCObjectType *objType = type->castAs<ObjCObjectType>(); 1286 if (ObjCInterfaceDecl *iface = objType->getInterface()) { 1287 // Look it up in the main interface (and categories, etc.) 1288 if (ObjCMethodDecl *method = iface->lookupMethod(sel, isInstance)) 1289 return method; 1290 1291 // Okay, look for "private" methods declared in any 1292 // @implementations we've seen. 1293 if (isInstance) { 1294 if (ObjCMethodDecl *method = LookupPrivateInstanceMethod(sel, iface)) 1295 return method; 1296 } else { 1297 if (ObjCMethodDecl *method = LookupPrivateClassMethod(sel, iface)) 1298 return method; 1299 } 1300 } 1301 1302 // Check qualifiers. 1303 for (ObjCObjectType::qual_iterator 1304 i = objType->qual_begin(), e = objType->qual_end(); i != e; ++i) 1305 if (ObjCMethodDecl *method = (*i)->lookupMethod(sel, isInstance)) 1306 return method; 1307 1308 return 0; 1309} 1310 1311/// LookupMethodInQualifiedType - Lookups up a method in protocol qualifier 1312/// list of a qualified objective pointer type. 1313ObjCMethodDecl *Sema::LookupMethodInQualifiedType(Selector Sel, 1314 const ObjCObjectPointerType *OPT, 1315 bool Instance) 1316{ 1317 ObjCMethodDecl *MD = 0; 1318 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 1319 E = OPT->qual_end(); I != E; ++I) { 1320 ObjCProtocolDecl *PROTO = (*I); 1321 if ((MD = PROTO->lookupMethod(Sel, Instance))) { 1322 return MD; 1323 } 1324 } 1325 return 0; 1326} 1327 1328static void DiagnoseARCUseOfWeakReceiver(Sema &S, Expr *Receiver) { 1329 if (!Receiver) 1330 return; 1331 1332 Expr *RExpr = Receiver->IgnoreParenImpCasts(); 1333 SourceLocation Loc = RExpr->getLocStart(); 1334 QualType T = RExpr->getType(); 1335 ObjCPropertyDecl *PDecl = 0; 1336 ObjCMethodDecl *GDecl = 0; 1337 if (PseudoObjectExpr *POE = dyn_cast<PseudoObjectExpr>(RExpr)) { 1338 RExpr = POE->getSyntacticForm(); 1339 if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(RExpr)) { 1340 if (PRE->isImplicitProperty()) { 1341 GDecl = PRE->getImplicitPropertyGetter(); 1342 if (GDecl) { 1343 T = GDecl->getResultType(); 1344 } 1345 } 1346 else { 1347 PDecl = PRE->getExplicitProperty(); 1348 if (PDecl) { 1349 T = PDecl->getType(); 1350 } 1351 } 1352 } 1353 } 1354 1355 if (T.getObjCLifetime() == Qualifiers::OCL_Weak) { 1356 S.Diag(Loc, diag::warn_receiver_is_weak) 1357 << ((!PDecl && !GDecl) ? 0 : (PDecl ? 1 : 2)); 1358 if (PDecl) 1359 S.Diag(PDecl->getLocation(), diag::note_property_declare); 1360 else if (GDecl) 1361 S.Diag(GDecl->getLocation(), diag::note_method_declared_at) << GDecl; 1362 return; 1363 } 1364 1365 if (PDecl && 1366 (PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak)) { 1367 S.Diag(Loc, diag::warn_receiver_is_weak) << 1; 1368 S.Diag(PDecl->getLocation(), diag::note_property_declare); 1369 } 1370} 1371 1372/// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an 1373/// objective C interface. This is a property reference expression. 1374ExprResult Sema:: 1375HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT, 1376 Expr *BaseExpr, SourceLocation OpLoc, 1377 DeclarationName MemberName, 1378 SourceLocation MemberLoc, 1379 SourceLocation SuperLoc, QualType SuperType, 1380 bool Super) { 1381 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType(); 1382 ObjCInterfaceDecl *IFace = IFaceT->getDecl(); 1383 1384 if (MemberName.getNameKind() != DeclarationName::Identifier) { 1385 Diag(MemberLoc, diag::err_invalid_property_name) 1386 << MemberName << QualType(OPT, 0); 1387 return ExprError(); 1388 } 1389 1390 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 1391 SourceRange BaseRange = Super? SourceRange(SuperLoc) 1392 : BaseExpr->getSourceRange(); 1393 if (RequireCompleteType(MemberLoc, OPT->getPointeeType(), 1394 diag::err_property_not_found_forward_class, 1395 MemberName, BaseRange)) 1396 return ExprError(); 1397 1398 // Search for a declared property first. 1399 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration(Member)) { 1400 // Check whether we can reference this property. 1401 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1402 return ExprError(); 1403 if (Super) 1404 return Owned(new (Context) ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, 1405 VK_LValue, OK_ObjCProperty, 1406 MemberLoc, 1407 SuperLoc, SuperType)); 1408 else 1409 return Owned(new (Context) ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, 1410 VK_LValue, OK_ObjCProperty, 1411 MemberLoc, BaseExpr)); 1412 } 1413 // Check protocols on qualified interfaces. 1414 for (ObjCObjectPointerType::qual_iterator I = OPT->qual_begin(), 1415 E = OPT->qual_end(); I != E; ++I) 1416 if (ObjCPropertyDecl *PD = (*I)->FindPropertyDeclaration(Member)) { 1417 // Check whether we can reference this property. 1418 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1419 return ExprError(); 1420 1421 if (Super) 1422 return Owned(new (Context) ObjCPropertyRefExpr(PD, 1423 Context.PseudoObjectTy, 1424 VK_LValue, 1425 OK_ObjCProperty, 1426 MemberLoc, 1427 SuperLoc, SuperType)); 1428 else 1429 return Owned(new (Context) ObjCPropertyRefExpr(PD, 1430 Context.PseudoObjectTy, 1431 VK_LValue, 1432 OK_ObjCProperty, 1433 MemberLoc, 1434 BaseExpr)); 1435 } 1436 // If that failed, look for an "implicit" property by seeing if the nullary 1437 // selector is implemented. 1438 1439 // FIXME: The logic for looking up nullary and unary selectors should be 1440 // shared with the code in ActOnInstanceMessage. 1441 1442 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 1443 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 1444 1445 // May be founf in property's qualified list. 1446 if (!Getter) 1447 Getter = LookupMethodInQualifiedType(Sel, OPT, true); 1448 1449 // If this reference is in an @implementation, check for 'private' methods. 1450 if (!Getter) 1451 Getter = IFace->lookupPrivateMethod(Sel); 1452 1453 // Look through local category implementations associated with the class. 1454 if (!Getter) 1455 Getter = IFace->getCategoryInstanceMethod(Sel); 1456 if (Getter) { 1457 // Check if we can reference this property. 1458 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 1459 return ExprError(); 1460 } 1461 // If we found a getter then this may be a valid dot-reference, we 1462 // will look for the matching setter, in case it is needed. 1463 Selector SetterSel = 1464 SelectorTable::constructSetterName(PP.getIdentifierTable(), 1465 PP.getSelectorTable(), Member); 1466 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 1467 1468 // May be founf in property's qualified list. 1469 if (!Setter) 1470 Setter = LookupMethodInQualifiedType(SetterSel, OPT, true); 1471 1472 if (!Setter) { 1473 // If this reference is in an @implementation, also check for 'private' 1474 // methods. 1475 Setter = IFace->lookupPrivateMethod(SetterSel); 1476 } 1477 // Look through local category implementations associated with the class. 1478 if (!Setter) 1479 Setter = IFace->getCategoryInstanceMethod(SetterSel); 1480 1481 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 1482 return ExprError(); 1483 1484 if (Getter || Setter) { 1485 if (Super) 1486 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter, 1487 Context.PseudoObjectTy, 1488 VK_LValue, OK_ObjCProperty, 1489 MemberLoc, 1490 SuperLoc, SuperType)); 1491 else 1492 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter, 1493 Context.PseudoObjectTy, 1494 VK_LValue, OK_ObjCProperty, 1495 MemberLoc, BaseExpr)); 1496 1497 } 1498 1499 // Attempt to correct for typos in property names. 1500 DeclFilterCCC<ObjCPropertyDecl> Validator; 1501 if (TypoCorrection Corrected = CorrectTypo( 1502 DeclarationNameInfo(MemberName, MemberLoc), LookupOrdinaryName, NULL, 1503 NULL, Validator, IFace, false, OPT)) { 1504 ObjCPropertyDecl *Property = 1505 Corrected.getCorrectionDeclAs<ObjCPropertyDecl>(); 1506 DeclarationName TypoResult = Corrected.getCorrection(); 1507 Diag(MemberLoc, diag::err_property_not_found_suggest) 1508 << MemberName << QualType(OPT, 0) << TypoResult 1509 << FixItHint::CreateReplacement(MemberLoc, TypoResult.getAsString()); 1510 Diag(Property->getLocation(), diag::note_previous_decl) 1511 << Property->getDeclName(); 1512 return HandleExprPropertyRefExpr(OPT, BaseExpr, OpLoc, 1513 TypoResult, MemberLoc, 1514 SuperLoc, SuperType, Super); 1515 } 1516 ObjCInterfaceDecl *ClassDeclared; 1517 if (ObjCIvarDecl *Ivar = 1518 IFace->lookupInstanceVariable(Member, ClassDeclared)) { 1519 QualType T = Ivar->getType(); 1520 if (const ObjCObjectPointerType * OBJPT = 1521 T->getAsObjCInterfacePointerType()) { 1522 if (RequireCompleteType(MemberLoc, OBJPT->getPointeeType(), 1523 diag::err_property_not_as_forward_class, 1524 MemberName, BaseExpr)) 1525 return ExprError(); 1526 } 1527 Diag(MemberLoc, 1528 diag::err_ivar_access_using_property_syntax_suggest) 1529 << MemberName << QualType(OPT, 0) << Ivar->getDeclName() 1530 << FixItHint::CreateReplacement(OpLoc, "->"); 1531 return ExprError(); 1532 } 1533 1534 Diag(MemberLoc, diag::err_property_not_found) 1535 << MemberName << QualType(OPT, 0); 1536 if (Setter) 1537 Diag(Setter->getLocation(), diag::note_getter_unavailable) 1538 << MemberName << BaseExpr->getSourceRange(); 1539 return ExprError(); 1540} 1541 1542 1543 1544ExprResult Sema:: 1545ActOnClassPropertyRefExpr(IdentifierInfo &receiverName, 1546 IdentifierInfo &propertyName, 1547 SourceLocation receiverNameLoc, 1548 SourceLocation propertyNameLoc) { 1549 1550 IdentifierInfo *receiverNamePtr = &receiverName; 1551 ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr, 1552 receiverNameLoc); 1553 1554 bool IsSuper = false; 1555 if (IFace == 0) { 1556 // If the "receiver" is 'super' in a method, handle it as an expression-like 1557 // property reference. 1558 if (receiverNamePtr->isStr("super")) { 1559 IsSuper = true; 1560 1561 if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf(receiverNameLoc)) { 1562 if (CurMethod->isInstanceMethod()) { 1563 QualType T = 1564 Context.getObjCInterfaceType(CurMethod->getClassInterface()); 1565 T = Context.getObjCObjectPointerType(T); 1566 1567 return HandleExprPropertyRefExpr(T->getAsObjCInterfacePointerType(), 1568 /*BaseExpr*/0, 1569 SourceLocation()/*OpLoc*/, 1570 &propertyName, 1571 propertyNameLoc, 1572 receiverNameLoc, T, true); 1573 } 1574 1575 // Otherwise, if this is a class method, try dispatching to our 1576 // superclass. 1577 IFace = CurMethod->getClassInterface()->getSuperClass(); 1578 } 1579 } 1580 1581 if (IFace == 0) { 1582 Diag(receiverNameLoc, diag::err_expected_ident_or_lparen); 1583 return ExprError(); 1584 } 1585 } 1586 1587 // Search for a declared property first. 1588 Selector Sel = PP.getSelectorTable().getNullarySelector(&propertyName); 1589 ObjCMethodDecl *Getter = IFace->lookupClassMethod(Sel); 1590 1591 // If this reference is in an @implementation, check for 'private' methods. 1592 if (!Getter) 1593 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1594 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1595 if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation()) 1596 Getter = ImpDecl->getClassMethod(Sel); 1597 1598 if (Getter) { 1599 // FIXME: refactor/share with ActOnMemberReference(). 1600 // Check if we can reference this property. 1601 if (DiagnoseUseOfDecl(Getter, propertyNameLoc)) 1602 return ExprError(); 1603 } 1604 1605 // Look for the matching setter, in case it is needed. 1606 Selector SetterSel = 1607 SelectorTable::constructSetterName(PP.getIdentifierTable(), 1608 PP.getSelectorTable(), &propertyName); 1609 1610 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); 1611 if (!Setter) { 1612 // If this reference is in an @implementation, also check for 'private' 1613 // methods. 1614 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 1615 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 1616 if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation()) 1617 Setter = ImpDecl->getClassMethod(SetterSel); 1618 } 1619 // Look through local category implementations associated with the class. 1620 if (!Setter) 1621 Setter = IFace->getCategoryClassMethod(SetterSel); 1622 1623 if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc)) 1624 return ExprError(); 1625 1626 if (Getter || Setter) { 1627 if (IsSuper) 1628 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter, 1629 Context.PseudoObjectTy, 1630 VK_LValue, OK_ObjCProperty, 1631 propertyNameLoc, 1632 receiverNameLoc, 1633 Context.getObjCInterfaceType(IFace))); 1634 1635 return Owned(new (Context) ObjCPropertyRefExpr(Getter, Setter, 1636 Context.PseudoObjectTy, 1637 VK_LValue, OK_ObjCProperty, 1638 propertyNameLoc, 1639 receiverNameLoc, IFace)); 1640 } 1641 return ExprError(Diag(propertyNameLoc, diag::err_property_not_found) 1642 << &propertyName << Context.getObjCInterfaceType(IFace)); 1643} 1644 1645namespace { 1646 1647class ObjCInterfaceOrSuperCCC : public CorrectionCandidateCallback { 1648 public: 1649 ObjCInterfaceOrSuperCCC(ObjCMethodDecl *Method) { 1650 // Determine whether "super" is acceptable in the current context. 1651 if (Method && Method->getClassInterface()) 1652 WantObjCSuper = Method->getClassInterface()->getSuperClass(); 1653 } 1654 1655 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 1656 return candidate.getCorrectionDeclAs<ObjCInterfaceDecl>() || 1657 candidate.isKeyword("super"); 1658 } 1659}; 1660 1661} 1662 1663Sema::ObjCMessageKind Sema::getObjCMessageKind(Scope *S, 1664 IdentifierInfo *Name, 1665 SourceLocation NameLoc, 1666 bool IsSuper, 1667 bool HasTrailingDot, 1668 ParsedType &ReceiverType) { 1669 ReceiverType = ParsedType(); 1670 1671 // If the identifier is "super" and there is no trailing dot, we're 1672 // messaging super. If the identifier is "super" and there is a 1673 // trailing dot, it's an instance message. 1674 if (IsSuper && S->isInObjcMethodScope()) 1675 return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage; 1676 1677 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 1678 LookupName(Result, S); 1679 1680 switch (Result.getResultKind()) { 1681 case LookupResult::NotFound: 1682 // Normal name lookup didn't find anything. If we're in an 1683 // Objective-C method, look for ivars. If we find one, we're done! 1684 // FIXME: This is a hack. Ivar lookup should be part of normal 1685 // lookup. 1686 if (ObjCMethodDecl *Method = getCurMethodDecl()) { 1687 if (!Method->getClassInterface()) { 1688 // Fall back: let the parser try to parse it as an instance message. 1689 return ObjCInstanceMessage; 1690 } 1691 1692 ObjCInterfaceDecl *ClassDeclared; 1693 if (Method->getClassInterface()->lookupInstanceVariable(Name, 1694 ClassDeclared)) 1695 return ObjCInstanceMessage; 1696 } 1697 1698 // Break out; we'll perform typo correction below. 1699 break; 1700 1701 case LookupResult::NotFoundInCurrentInstantiation: 1702 case LookupResult::FoundOverloaded: 1703 case LookupResult::FoundUnresolvedValue: 1704 case LookupResult::Ambiguous: 1705 Result.suppressDiagnostics(); 1706 return ObjCInstanceMessage; 1707 1708 case LookupResult::Found: { 1709 // If the identifier is a class or not, and there is a trailing dot, 1710 // it's an instance message. 1711 if (HasTrailingDot) 1712 return ObjCInstanceMessage; 1713 // We found something. If it's a type, then we have a class 1714 // message. Otherwise, it's an instance message. 1715 NamedDecl *ND = Result.getFoundDecl(); 1716 QualType T; 1717 if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND)) 1718 T = Context.getObjCInterfaceType(Class); 1719 else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND)) 1720 T = Context.getTypeDeclType(Type); 1721 else 1722 return ObjCInstanceMessage; 1723 1724 // We have a class message, and T is the type we're 1725 // messaging. Build source-location information for it. 1726 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc); 1727 ReceiverType = CreateParsedType(T, TSInfo); 1728 return ObjCClassMessage; 1729 } 1730 } 1731 1732 ObjCInterfaceOrSuperCCC Validator(getCurMethodDecl()); 1733 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 1734 Result.getLookupKind(), S, NULL, 1735 Validator)) { 1736 if (Corrected.isKeyword()) { 1737 // If we've found the keyword "super" (the only keyword that would be 1738 // returned by CorrectTypo), this is a send to super. 1739 Diag(NameLoc, diag::err_unknown_receiver_suggest) 1740 << Name << Corrected.getCorrection() 1741 << FixItHint::CreateReplacement(SourceRange(NameLoc), "super"); 1742 return ObjCSuperMessage; 1743 } else if (ObjCInterfaceDecl *Class = 1744 Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>()) { 1745 // If we found a declaration, correct when it refers to an Objective-C 1746 // class. 1747 Diag(NameLoc, diag::err_unknown_receiver_suggest) 1748 << Name << Corrected.getCorrection() 1749 << FixItHint::CreateReplacement(SourceRange(NameLoc), 1750 Class->getNameAsString()); 1751 Diag(Class->getLocation(), diag::note_previous_decl) 1752 << Corrected.getCorrection(); 1753 1754 QualType T = Context.getObjCInterfaceType(Class); 1755 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc); 1756 ReceiverType = CreateParsedType(T, TSInfo); 1757 return ObjCClassMessage; 1758 } 1759 } 1760 1761 // Fall back: let the parser try to parse it as an instance message. 1762 return ObjCInstanceMessage; 1763} 1764 1765ExprResult Sema::ActOnSuperMessage(Scope *S, 1766 SourceLocation SuperLoc, 1767 Selector Sel, 1768 SourceLocation LBracLoc, 1769 ArrayRef<SourceLocation> SelectorLocs, 1770 SourceLocation RBracLoc, 1771 MultiExprArg Args) { 1772 // Determine whether we are inside a method or not. 1773 ObjCMethodDecl *Method = tryCaptureObjCSelf(SuperLoc); 1774 if (!Method) { 1775 Diag(SuperLoc, diag::err_invalid_receiver_to_message_super); 1776 return ExprError(); 1777 } 1778 1779 ObjCInterfaceDecl *Class = Method->getClassInterface(); 1780 if (!Class) { 1781 Diag(SuperLoc, diag::error_no_super_class_message) 1782 << Method->getDeclName(); 1783 return ExprError(); 1784 } 1785 1786 ObjCInterfaceDecl *Super = Class->getSuperClass(); 1787 if (!Super) { 1788 // The current class does not have a superclass. 1789 Diag(SuperLoc, diag::error_root_class_cannot_use_super) 1790 << Class->getIdentifier(); 1791 return ExprError(); 1792 } 1793 1794 // We are in a method whose class has a superclass, so 'super' 1795 // is acting as a keyword. 1796 if (Method->isInstanceMethod()) { 1797 if (Sel.getMethodFamily() == OMF_dealloc) 1798 ObjCShouldCallSuperDealloc = false; 1799 if (Sel.getMethodFamily() == OMF_finalize) 1800 ObjCShouldCallSuperFinalize = false; 1801 1802 // Since we are in an instance method, this is an instance 1803 // message to the superclass instance. 1804 QualType SuperTy = Context.getObjCInterfaceType(Super); 1805 SuperTy = Context.getObjCObjectPointerType(SuperTy); 1806 return BuildInstanceMessage(0, SuperTy, SuperLoc, 1807 Sel, /*Method=*/0, 1808 LBracLoc, SelectorLocs, RBracLoc, move(Args)); 1809 } 1810 1811 // Since we are in a class method, this is a class message to 1812 // the superclass. 1813 return BuildClassMessage(/*ReceiverTypeInfo=*/0, 1814 Context.getObjCInterfaceType(Super), 1815 SuperLoc, Sel, /*Method=*/0, 1816 LBracLoc, SelectorLocs, RBracLoc, move(Args)); 1817} 1818 1819 1820ExprResult Sema::BuildClassMessageImplicit(QualType ReceiverType, 1821 bool isSuperReceiver, 1822 SourceLocation Loc, 1823 Selector Sel, 1824 ObjCMethodDecl *Method, 1825 MultiExprArg Args) { 1826 TypeSourceInfo *receiverTypeInfo = 0; 1827 if (!ReceiverType.isNull()) 1828 receiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType); 1829 1830 return BuildClassMessage(receiverTypeInfo, ReceiverType, 1831 /*SuperLoc=*/isSuperReceiver ? Loc : SourceLocation(), 1832 Sel, Method, Loc, Loc, Loc, Args, 1833 /*isImplicit=*/true); 1834 1835} 1836 1837static void applyCocoaAPICheck(Sema &S, const ObjCMessageExpr *Msg, 1838 unsigned DiagID, 1839 bool (*refactor)(const ObjCMessageExpr *, 1840 const NSAPI &, edit::Commit &)) { 1841 SourceLocation MsgLoc = Msg->getExprLoc(); 1842 if (S.Diags.getDiagnosticLevel(DiagID, MsgLoc) == DiagnosticsEngine::Ignored) 1843 return; 1844 1845 SourceManager &SM = S.SourceMgr; 1846 edit::Commit ECommit(SM, S.LangOpts); 1847 if (refactor(Msg,*S.NSAPIObj, ECommit)) { 1848 DiagnosticBuilder Builder = S.Diag(MsgLoc, DiagID) 1849 << Msg->getSelector() << Msg->getSourceRange(); 1850 // FIXME: Don't emit diagnostic at all if fixits are non-commitable. 1851 if (!ECommit.isCommitable()) 1852 return; 1853 for (edit::Commit::edit_iterator 1854 I = ECommit.edit_begin(), E = ECommit.edit_end(); I != E; ++I) { 1855 const edit::Commit::Edit &Edit = *I; 1856 switch (Edit.Kind) { 1857 case edit::Commit::Act_Insert: 1858 Builder.AddFixItHint(FixItHint::CreateInsertion(Edit.OrigLoc, 1859 Edit.Text, 1860 Edit.BeforePrev)); 1861 break; 1862 case edit::Commit::Act_InsertFromRange: 1863 Builder.AddFixItHint( 1864 FixItHint::CreateInsertionFromRange(Edit.OrigLoc, 1865 Edit.getInsertFromRange(SM), 1866 Edit.BeforePrev)); 1867 break; 1868 case edit::Commit::Act_Remove: 1869 Builder.AddFixItHint(FixItHint::CreateRemoval(Edit.getFileRange(SM))); 1870 break; 1871 } 1872 } 1873 } 1874} 1875 1876static void checkCocoaAPI(Sema &S, const ObjCMessageExpr *Msg) { 1877 applyCocoaAPICheck(S, Msg, diag::warn_objc_redundant_literal_use, 1878 edit::rewriteObjCRedundantCallWithLiteral); 1879} 1880 1881/// \brief Build an Objective-C class message expression. 1882/// 1883/// This routine takes care of both normal class messages and 1884/// class messages to the superclass. 1885/// 1886/// \param ReceiverTypeInfo Type source information that describes the 1887/// receiver of this message. This may be NULL, in which case we are 1888/// sending to the superclass and \p SuperLoc must be a valid source 1889/// location. 1890 1891/// \param ReceiverType The type of the object receiving the 1892/// message. When \p ReceiverTypeInfo is non-NULL, this is the same 1893/// type as that refers to. For a superclass send, this is the type of 1894/// the superclass. 1895/// 1896/// \param SuperLoc The location of the "super" keyword in a 1897/// superclass message. 1898/// 1899/// \param Sel The selector to which the message is being sent. 1900/// 1901/// \param Method The method that this class message is invoking, if 1902/// already known. 1903/// 1904/// \param LBracLoc The location of the opening square bracket ']'. 1905/// 1906/// \param RBrac The location of the closing square bracket ']'. 1907/// 1908/// \param Args The message arguments. 1909ExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo, 1910 QualType ReceiverType, 1911 SourceLocation SuperLoc, 1912 Selector Sel, 1913 ObjCMethodDecl *Method, 1914 SourceLocation LBracLoc, 1915 ArrayRef<SourceLocation> SelectorLocs, 1916 SourceLocation RBracLoc, 1917 MultiExprArg ArgsIn, 1918 bool isImplicit) { 1919 SourceLocation Loc = SuperLoc.isValid()? SuperLoc 1920 : ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin(); 1921 if (LBracLoc.isInvalid()) { 1922 Diag(Loc, diag::err_missing_open_square_message_send) 1923 << FixItHint::CreateInsertion(Loc, "["); 1924 LBracLoc = Loc; 1925 } 1926 1927 if (ReceiverType->isDependentType()) { 1928 // If the receiver type is dependent, we can't type-check anything 1929 // at this point. Build a dependent expression. 1930 unsigned NumArgs = ArgsIn.size(); 1931 Expr **Args = reinterpret_cast<Expr **>(ArgsIn.release()); 1932 assert(SuperLoc.isInvalid() && "Message to super with dependent type"); 1933 return Owned(ObjCMessageExpr::Create(Context, ReceiverType, 1934 VK_RValue, LBracLoc, ReceiverTypeInfo, 1935 Sel, SelectorLocs, /*Method=*/0, 1936 makeArrayRef(Args, NumArgs),RBracLoc, 1937 isImplicit)); 1938 } 1939 1940 // Find the class to which we are sending this message. 1941 ObjCInterfaceDecl *Class = 0; 1942 const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>(); 1943 if (!ClassType || !(Class = ClassType->getInterface())) { 1944 Diag(Loc, diag::err_invalid_receiver_class_message) 1945 << ReceiverType; 1946 return ExprError(); 1947 } 1948 assert(Class && "We don't know which class we're messaging?"); 1949 // objc++ diagnoses during typename annotation. 1950 if (!getLangOpts().CPlusPlus) 1951 (void)DiagnoseUseOfDecl(Class, Loc); 1952 // Find the method we are messaging. 1953 if (!Method) { 1954 SourceRange TypeRange 1955 = SuperLoc.isValid()? SourceRange(SuperLoc) 1956 : ReceiverTypeInfo->getTypeLoc().getSourceRange(); 1957 if (RequireCompleteType(Loc, Context.getObjCInterfaceType(Class), 1958 (getLangOpts().ObjCAutoRefCount 1959 ? diag::err_arc_receiver_forward_class 1960 : diag::warn_receiver_forward_class), 1961 TypeRange)) { 1962 // A forward class used in messaging is treated as a 'Class' 1963 Method = LookupFactoryMethodInGlobalPool(Sel, 1964 SourceRange(LBracLoc, RBracLoc)); 1965 if (Method && !getLangOpts().ObjCAutoRefCount) 1966 Diag(Method->getLocation(), diag::note_method_sent_forward_class) 1967 << Method->getDeclName(); 1968 } 1969 if (!Method) 1970 Method = Class->lookupClassMethod(Sel); 1971 1972 // If we have an implementation in scope, check "private" methods. 1973 if (!Method) 1974 Method = LookupPrivateClassMethod(Sel, Class); 1975 1976 if (Method && DiagnoseUseOfDecl(Method, Loc)) 1977 return ExprError(); 1978 } 1979 1980 // Check the argument types and determine the result type. 1981 QualType ReturnType; 1982 ExprValueKind VK = VK_RValue; 1983 1984 unsigned NumArgs = ArgsIn.size(); 1985 Expr **Args = reinterpret_cast<Expr **>(ArgsIn.release()); 1986 if (CheckMessageArgumentTypes(ReceiverType, Args, NumArgs, Sel, Method, true, 1987 SuperLoc.isValid(), LBracLoc, RBracLoc, 1988 ReturnType, VK)) 1989 return ExprError(); 1990 1991 if (Method && !Method->getResultType()->isVoidType() && 1992 RequireCompleteType(LBracLoc, Method->getResultType(), 1993 diag::err_illegal_message_expr_incomplete_type)) 1994 return ExprError(); 1995 1996 // Construct the appropriate ObjCMessageExpr. 1997 ObjCMessageExpr *Result; 1998 if (SuperLoc.isValid()) 1999 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc, 2000 SuperLoc, /*IsInstanceSuper=*/false, 2001 ReceiverType, Sel, SelectorLocs, 2002 Method, makeArrayRef(Args, NumArgs), 2003 RBracLoc, isImplicit); 2004 else { 2005 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc, 2006 ReceiverTypeInfo, Sel, SelectorLocs, 2007 Method, makeArrayRef(Args, NumArgs), 2008 RBracLoc, isImplicit); 2009 if (!isImplicit) 2010 checkCocoaAPI(*this, Result); 2011 } 2012 return MaybeBindToTemporary(Result); 2013} 2014 2015// ActOnClassMessage - used for both unary and keyword messages. 2016// ArgExprs is optional - if it is present, the number of expressions 2017// is obtained from Sel.getNumArgs(). 2018ExprResult Sema::ActOnClassMessage(Scope *S, 2019 ParsedType Receiver, 2020 Selector Sel, 2021 SourceLocation LBracLoc, 2022 ArrayRef<SourceLocation> SelectorLocs, 2023 SourceLocation RBracLoc, 2024 MultiExprArg Args) { 2025 TypeSourceInfo *ReceiverTypeInfo; 2026 QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo); 2027 if (ReceiverType.isNull()) 2028 return ExprError(); 2029 2030 2031 if (!ReceiverTypeInfo) 2032 ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc); 2033 2034 return BuildClassMessage(ReceiverTypeInfo, ReceiverType, 2035 /*SuperLoc=*/SourceLocation(), Sel, /*Method=*/0, 2036 LBracLoc, SelectorLocs, RBracLoc, move(Args)); 2037} 2038 2039ExprResult Sema::BuildInstanceMessageImplicit(Expr *Receiver, 2040 QualType ReceiverType, 2041 SourceLocation Loc, 2042 Selector Sel, 2043 ObjCMethodDecl *Method, 2044 MultiExprArg Args) { 2045 return BuildInstanceMessage(Receiver, ReceiverType, 2046 /*SuperLoc=*/!Receiver ? Loc : SourceLocation(), 2047 Sel, Method, Loc, Loc, Loc, Args, 2048 /*isImplicit=*/true); 2049} 2050 2051/// \brief Build an Objective-C instance message expression. 2052/// 2053/// This routine takes care of both normal instance messages and 2054/// instance messages to the superclass instance. 2055/// 2056/// \param Receiver The expression that computes the object that will 2057/// receive this message. This may be empty, in which case we are 2058/// sending to the superclass instance and \p SuperLoc must be a valid 2059/// source location. 2060/// 2061/// \param ReceiverType The (static) type of the object receiving the 2062/// message. When a \p Receiver expression is provided, this is the 2063/// same type as that expression. For a superclass instance send, this 2064/// is a pointer to the type of the superclass. 2065/// 2066/// \param SuperLoc The location of the "super" keyword in a 2067/// superclass instance message. 2068/// 2069/// \param Sel The selector to which the message is being sent. 2070/// 2071/// \param Method The method that this instance message is invoking, if 2072/// already known. 2073/// 2074/// \param LBracLoc The location of the opening square bracket ']'. 2075/// 2076/// \param RBrac The location of the closing square bracket ']'. 2077/// 2078/// \param Args The message arguments. 2079ExprResult Sema::BuildInstanceMessage(Expr *Receiver, 2080 QualType ReceiverType, 2081 SourceLocation SuperLoc, 2082 Selector Sel, 2083 ObjCMethodDecl *Method, 2084 SourceLocation LBracLoc, 2085 ArrayRef<SourceLocation> SelectorLocs, 2086 SourceLocation RBracLoc, 2087 MultiExprArg ArgsIn, 2088 bool isImplicit) { 2089 // The location of the receiver. 2090 SourceLocation Loc = SuperLoc.isValid()? SuperLoc : Receiver->getLocStart(); 2091 2092 if (LBracLoc.isInvalid()) { 2093 Diag(Loc, diag::err_missing_open_square_message_send) 2094 << FixItHint::CreateInsertion(Loc, "["); 2095 LBracLoc = Loc; 2096 } 2097 2098 // If we have a receiver expression, perform appropriate promotions 2099 // and determine receiver type. 2100 if (Receiver) { 2101 if (Receiver->hasPlaceholderType()) { 2102 ExprResult Result; 2103 if (Receiver->getType() == Context.UnknownAnyTy) 2104 Result = forceUnknownAnyToType(Receiver, Context.getObjCIdType()); 2105 else 2106 Result = CheckPlaceholderExpr(Receiver); 2107 if (Result.isInvalid()) return ExprError(); 2108 Receiver = Result.take(); 2109 } 2110 2111 if (Receiver->isTypeDependent()) { 2112 // If the receiver is type-dependent, we can't type-check anything 2113 // at this point. Build a dependent expression. 2114 unsigned NumArgs = ArgsIn.size(); 2115 Expr **Args = reinterpret_cast<Expr **>(ArgsIn.release()); 2116 assert(SuperLoc.isInvalid() && "Message to super with dependent type"); 2117 return Owned(ObjCMessageExpr::Create(Context, Context.DependentTy, 2118 VK_RValue, LBracLoc, Receiver, Sel, 2119 SelectorLocs, /*Method=*/0, 2120 makeArrayRef(Args, NumArgs), 2121 RBracLoc, isImplicit)); 2122 } 2123 2124 // If necessary, apply function/array conversion to the receiver. 2125 // C99 6.7.5.3p[7,8]. 2126 ExprResult Result = DefaultFunctionArrayLvalueConversion(Receiver); 2127 if (Result.isInvalid()) 2128 return ExprError(); 2129 Receiver = Result.take(); 2130 ReceiverType = Receiver->getType(); 2131 } 2132 2133 if (!Method) { 2134 // Handle messages to id. 2135 bool receiverIsId = ReceiverType->isObjCIdType(); 2136 if (receiverIsId || ReceiverType->isBlockPointerType() || 2137 (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) { 2138 Method = LookupInstanceMethodInGlobalPool(Sel, 2139 SourceRange(LBracLoc, RBracLoc), 2140 receiverIsId); 2141 if (!Method) 2142 Method = LookupFactoryMethodInGlobalPool(Sel, 2143 SourceRange(LBracLoc,RBracLoc), 2144 receiverIsId); 2145 } else if (ReceiverType->isObjCClassType() || 2146 ReceiverType->isObjCQualifiedClassType()) { 2147 // Handle messages to Class. 2148 // We allow sending a message to a qualified Class ("Class<foo>"), which 2149 // is ok as long as one of the protocols implements the selector (if not, warn). 2150 if (const ObjCObjectPointerType *QClassTy 2151 = ReceiverType->getAsObjCQualifiedClassType()) { 2152 // Search protocols for class methods. 2153 Method = LookupMethodInQualifiedType(Sel, QClassTy, false); 2154 if (!Method) { 2155 Method = LookupMethodInQualifiedType(Sel, QClassTy, true); 2156 // warn if instance method found for a Class message. 2157 if (Method) { 2158 Diag(Loc, diag::warn_instance_method_on_class_found) 2159 << Method->getSelector() << Sel; 2160 Diag(Method->getLocation(), diag::note_method_declared_at) 2161 << Method->getDeclName(); 2162 } 2163 } 2164 } else { 2165 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) { 2166 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) { 2167 // First check the public methods in the class interface. 2168 Method = ClassDecl->lookupClassMethod(Sel); 2169 2170 if (!Method) 2171 Method = LookupPrivateClassMethod(Sel, ClassDecl); 2172 } 2173 if (Method && DiagnoseUseOfDecl(Method, Loc)) 2174 return ExprError(); 2175 } 2176 if (!Method) { 2177 // If not messaging 'self', look for any factory method named 'Sel'. 2178 if (!Receiver || !isSelfExpr(Receiver)) { 2179 Method = LookupFactoryMethodInGlobalPool(Sel, 2180 SourceRange(LBracLoc, RBracLoc), 2181 true); 2182 if (!Method) { 2183 // If no class (factory) method was found, check if an _instance_ 2184 // method of the same name exists in the root class only. 2185 Method = LookupInstanceMethodInGlobalPool(Sel, 2186 SourceRange(LBracLoc, RBracLoc), 2187 true); 2188 if (Method) 2189 if (const ObjCInterfaceDecl *ID = 2190 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) { 2191 if (ID->getSuperClass()) 2192 Diag(Loc, diag::warn_root_inst_method_not_found) 2193 << Sel << SourceRange(LBracLoc, RBracLoc); 2194 } 2195 } 2196 } 2197 } 2198 } 2199 } else { 2200 ObjCInterfaceDecl* ClassDecl = 0; 2201 2202 // We allow sending a message to a qualified ID ("id<foo>"), which is ok as 2203 // long as one of the protocols implements the selector (if not, warn). 2204 if (const ObjCObjectPointerType *QIdTy 2205 = ReceiverType->getAsObjCQualifiedIdType()) { 2206 // Search protocols for instance methods. 2207 Method = LookupMethodInQualifiedType(Sel, QIdTy, true); 2208 if (!Method) 2209 Method = LookupMethodInQualifiedType(Sel, QIdTy, false); 2210 } else if (const ObjCObjectPointerType *OCIType 2211 = ReceiverType->getAsObjCInterfacePointerType()) { 2212 // We allow sending a message to a pointer to an interface (an object). 2213 ClassDecl = OCIType->getInterfaceDecl(); 2214 2215 // Try to complete the type. Under ARC, this is a hard error from which 2216 // we don't try to recover. 2217 const ObjCInterfaceDecl *forwardClass = 0; 2218 if (RequireCompleteType(Loc, OCIType->getPointeeType(), 2219 getLangOpts().ObjCAutoRefCount 2220 ? diag::err_arc_receiver_forward_instance 2221 : diag::warn_receiver_forward_instance, 2222 Receiver? Receiver->getSourceRange() 2223 : SourceRange(SuperLoc))) { 2224 if (getLangOpts().ObjCAutoRefCount) 2225 return ExprError(); 2226 2227 forwardClass = OCIType->getInterfaceDecl(); 2228 Diag(Receiver ? Receiver->getLocStart() 2229 : SuperLoc, diag::note_receiver_is_id); 2230 Method = 0; 2231 } else { 2232 Method = ClassDecl->lookupInstanceMethod(Sel); 2233 } 2234 2235 if (!Method) 2236 // Search protocol qualifiers. 2237 Method = LookupMethodInQualifiedType(Sel, OCIType, true); 2238 2239 if (!Method) { 2240 // If we have implementations in scope, check "private" methods. 2241 Method = LookupPrivateInstanceMethod(Sel, ClassDecl); 2242 2243 if (!Method && getLangOpts().ObjCAutoRefCount) { 2244 Diag(Loc, diag::err_arc_may_not_respond) 2245 << OCIType->getPointeeType() << Sel; 2246 return ExprError(); 2247 } 2248 2249 if (!Method && (!Receiver || !isSelfExpr(Receiver))) { 2250 // If we still haven't found a method, look in the global pool. This 2251 // behavior isn't very desirable, however we need it for GCC 2252 // compatibility. FIXME: should we deviate?? 2253 if (OCIType->qual_empty()) { 2254 Method = LookupInstanceMethodInGlobalPool(Sel, 2255 SourceRange(LBracLoc, RBracLoc)); 2256 if (Method && !forwardClass) 2257 Diag(Loc, diag::warn_maynot_respond) 2258 << OCIType->getInterfaceDecl()->getIdentifier() << Sel; 2259 } 2260 } 2261 } 2262 if (Method && DiagnoseUseOfDecl(Method, Loc, forwardClass)) 2263 return ExprError(); 2264 } else if (!getLangOpts().ObjCAutoRefCount && 2265 !Context.getObjCIdType().isNull() && 2266 (ReceiverType->isPointerType() || 2267 ReceiverType->isIntegerType())) { 2268 // Implicitly convert integers and pointers to 'id' but emit a warning. 2269 // But not in ARC. 2270 Diag(Loc, diag::warn_bad_receiver_type) 2271 << ReceiverType 2272 << Receiver->getSourceRange(); 2273 if (ReceiverType->isPointerType()) 2274 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(), 2275 CK_CPointerToObjCPointerCast).take(); 2276 else { 2277 // TODO: specialized warning on null receivers? 2278 bool IsNull = Receiver->isNullPointerConstant(Context, 2279 Expr::NPC_ValueDependentIsNull); 2280 CastKind Kind = IsNull ? CK_NullToPointer : CK_IntegralToPointer; 2281 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(), 2282 Kind).take(); 2283 } 2284 ReceiverType = Receiver->getType(); 2285 } else { 2286 ExprResult ReceiverRes; 2287 if (getLangOpts().CPlusPlus) 2288 ReceiverRes = PerformContextuallyConvertToObjCPointer(Receiver); 2289 if (ReceiverRes.isUsable()) { 2290 Receiver = ReceiverRes.take(); 2291 return BuildInstanceMessage(Receiver, 2292 ReceiverType, 2293 SuperLoc, 2294 Sel, 2295 Method, 2296 LBracLoc, 2297 SelectorLocs, 2298 RBracLoc, 2299 move(ArgsIn)); 2300 } else { 2301 // Reject other random receiver types (e.g. structs). 2302 Diag(Loc, diag::err_bad_receiver_type) 2303 << ReceiverType << Receiver->getSourceRange(); 2304 return ExprError(); 2305 } 2306 } 2307 } 2308 } 2309 2310 // Check the message arguments. 2311 unsigned NumArgs = ArgsIn.size(); 2312 Expr **Args = reinterpret_cast<Expr **>(ArgsIn.release()); 2313 QualType ReturnType; 2314 ExprValueKind VK = VK_RValue; 2315 bool ClassMessage = (ReceiverType->isObjCClassType() || 2316 ReceiverType->isObjCQualifiedClassType()); 2317 if (CheckMessageArgumentTypes(ReceiverType, Args, NumArgs, Sel, Method, 2318 ClassMessage, SuperLoc.isValid(), 2319 LBracLoc, RBracLoc, ReturnType, VK)) 2320 return ExprError(); 2321 2322 if (Method && !Method->getResultType()->isVoidType() && 2323 RequireCompleteType(LBracLoc, Method->getResultType(), 2324 diag::err_illegal_message_expr_incomplete_type)) 2325 return ExprError(); 2326 2327 SourceLocation SelLoc = SelectorLocs.front(); 2328 2329 // In ARC, forbid the user from sending messages to 2330 // retain/release/autorelease/dealloc/retainCount explicitly. 2331 if (getLangOpts().ObjCAutoRefCount) { 2332 ObjCMethodFamily family = 2333 (Method ? Method->getMethodFamily() : Sel.getMethodFamily()); 2334 switch (family) { 2335 case OMF_init: 2336 if (Method) 2337 checkInitMethod(Method, ReceiverType); 2338 2339 case OMF_None: 2340 case OMF_alloc: 2341 case OMF_copy: 2342 case OMF_finalize: 2343 case OMF_mutableCopy: 2344 case OMF_new: 2345 case OMF_self: 2346 break; 2347 2348 case OMF_dealloc: 2349 case OMF_retain: 2350 case OMF_release: 2351 case OMF_autorelease: 2352 case OMF_retainCount: 2353 Diag(Loc, diag::err_arc_illegal_explicit_message) 2354 << Sel << SelLoc; 2355 break; 2356 2357 case OMF_performSelector: 2358 if (Method && NumArgs >= 1) { 2359 if (ObjCSelectorExpr *SelExp = dyn_cast<ObjCSelectorExpr>(Args[0])) { 2360 Selector ArgSel = SelExp->getSelector(); 2361 ObjCMethodDecl *SelMethod = 2362 LookupInstanceMethodInGlobalPool(ArgSel, 2363 SelExp->getSourceRange()); 2364 if (!SelMethod) 2365 SelMethod = 2366 LookupFactoryMethodInGlobalPool(ArgSel, 2367 SelExp->getSourceRange()); 2368 if (SelMethod) { 2369 ObjCMethodFamily SelFamily = SelMethod->getMethodFamily(); 2370 switch (SelFamily) { 2371 case OMF_alloc: 2372 case OMF_copy: 2373 case OMF_mutableCopy: 2374 case OMF_new: 2375 case OMF_self: 2376 case OMF_init: 2377 // Issue error, unless ns_returns_not_retained. 2378 if (!SelMethod->hasAttr<NSReturnsNotRetainedAttr>()) { 2379 // selector names a +1 method 2380 Diag(SelLoc, 2381 diag::err_arc_perform_selector_retains); 2382 Diag(SelMethod->getLocation(), diag::note_method_declared_at) 2383 << SelMethod->getDeclName(); 2384 } 2385 break; 2386 default: 2387 // +0 call. OK. unless ns_returns_retained. 2388 if (SelMethod->hasAttr<NSReturnsRetainedAttr>()) { 2389 // selector names a +1 method 2390 Diag(SelLoc, 2391 diag::err_arc_perform_selector_retains); 2392 Diag(SelMethod->getLocation(), diag::note_method_declared_at) 2393 << SelMethod->getDeclName(); 2394 } 2395 break; 2396 } 2397 } 2398 } else { 2399 // error (may leak). 2400 Diag(SelLoc, diag::warn_arc_perform_selector_leaks); 2401 Diag(Args[0]->getExprLoc(), diag::note_used_here); 2402 } 2403 } 2404 break; 2405 } 2406 } 2407 2408 // Construct the appropriate ObjCMessageExpr instance. 2409 ObjCMessageExpr *Result; 2410 if (SuperLoc.isValid()) 2411 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc, 2412 SuperLoc, /*IsInstanceSuper=*/true, 2413 ReceiverType, Sel, SelectorLocs, Method, 2414 makeArrayRef(Args, NumArgs), RBracLoc, 2415 isImplicit); 2416 else { 2417 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc, 2418 Receiver, Sel, SelectorLocs, Method, 2419 makeArrayRef(Args, NumArgs), RBracLoc, 2420 isImplicit); 2421 if (!isImplicit) 2422 checkCocoaAPI(*this, Result); 2423 } 2424 2425 if (getLangOpts().ObjCAutoRefCount) { 2426 DiagnoseARCUseOfWeakReceiver(*this, Receiver); 2427 2428 // In ARC, annotate delegate init calls. 2429 if (Result->getMethodFamily() == OMF_init && 2430 (SuperLoc.isValid() || isSelfExpr(Receiver))) { 2431 // Only consider init calls *directly* in init implementations, 2432 // not within blocks. 2433 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(CurContext); 2434 if (method && method->getMethodFamily() == OMF_init) { 2435 // The implicit assignment to self means we also don't want to 2436 // consume the result. 2437 Result->setDelegateInitCall(true); 2438 return Owned(Result); 2439 } 2440 } 2441 2442 // In ARC, check for message sends which are likely to introduce 2443 // retain cycles. 2444 checkRetainCycles(Result); 2445 } 2446 2447 return MaybeBindToTemporary(Result); 2448} 2449 2450// ActOnInstanceMessage - used for both unary and keyword messages. 2451// ArgExprs is optional - if it is present, the number of expressions 2452// is obtained from Sel.getNumArgs(). 2453ExprResult Sema::ActOnInstanceMessage(Scope *S, 2454 Expr *Receiver, 2455 Selector Sel, 2456 SourceLocation LBracLoc, 2457 ArrayRef<SourceLocation> SelectorLocs, 2458 SourceLocation RBracLoc, 2459 MultiExprArg Args) { 2460 if (!Receiver) 2461 return ExprError(); 2462 2463 return BuildInstanceMessage(Receiver, Receiver->getType(), 2464 /*SuperLoc=*/SourceLocation(), Sel, /*Method=*/0, 2465 LBracLoc, SelectorLocs, RBracLoc, move(Args)); 2466} 2467 2468enum ARCConversionTypeClass { 2469 /// int, void, struct A 2470 ACTC_none, 2471 2472 /// id, void (^)() 2473 ACTC_retainable, 2474 2475 /// id*, id***, void (^*)(), 2476 ACTC_indirectRetainable, 2477 2478 /// void* might be a normal C type, or it might a CF type. 2479 ACTC_voidPtr, 2480 2481 /// struct A* 2482 ACTC_coreFoundation 2483}; 2484static bool isAnyRetainable(ARCConversionTypeClass ACTC) { 2485 return (ACTC == ACTC_retainable || 2486 ACTC == ACTC_coreFoundation || 2487 ACTC == ACTC_voidPtr); 2488} 2489static bool isAnyCLike(ARCConversionTypeClass ACTC) { 2490 return ACTC == ACTC_none || 2491 ACTC == ACTC_voidPtr || 2492 ACTC == ACTC_coreFoundation; 2493} 2494 2495static ARCConversionTypeClass classifyTypeForARCConversion(QualType type) { 2496 bool isIndirect = false; 2497 2498 // Ignore an outermost reference type. 2499 if (const ReferenceType *ref = type->getAs<ReferenceType>()) { 2500 type = ref->getPointeeType(); 2501 isIndirect = true; 2502 } 2503 2504 // Drill through pointers and arrays recursively. 2505 while (true) { 2506 if (const PointerType *ptr = type->getAs<PointerType>()) { 2507 type = ptr->getPointeeType(); 2508 2509 // The first level of pointer may be the innermost pointer on a CF type. 2510 if (!isIndirect) { 2511 if (type->isVoidType()) return ACTC_voidPtr; 2512 if (type->isRecordType()) return ACTC_coreFoundation; 2513 } 2514 } else if (const ArrayType *array = type->getAsArrayTypeUnsafe()) { 2515 type = QualType(array->getElementType()->getBaseElementTypeUnsafe(), 0); 2516 } else { 2517 break; 2518 } 2519 isIndirect = true; 2520 } 2521 2522 if (isIndirect) { 2523 if (type->isObjCARCBridgableType()) 2524 return ACTC_indirectRetainable; 2525 return ACTC_none; 2526 } 2527 2528 if (type->isObjCARCBridgableType()) 2529 return ACTC_retainable; 2530 2531 return ACTC_none; 2532} 2533 2534namespace { 2535 /// A result from the cast checker. 2536 enum ACCResult { 2537 /// Cannot be casted. 2538 ACC_invalid, 2539 2540 /// Can be safely retained or not retained. 2541 ACC_bottom, 2542 2543 /// Can be casted at +0. 2544 ACC_plusZero, 2545 2546 /// Can be casted at +1. 2547 ACC_plusOne 2548 }; 2549 ACCResult merge(ACCResult left, ACCResult right) { 2550 if (left == right) return left; 2551 if (left == ACC_bottom) return right; 2552 if (right == ACC_bottom) return left; 2553 return ACC_invalid; 2554 } 2555 2556 /// A checker which white-lists certain expressions whose conversion 2557 /// to or from retainable type would otherwise be forbidden in ARC. 2558 class ARCCastChecker : public StmtVisitor<ARCCastChecker, ACCResult> { 2559 typedef StmtVisitor<ARCCastChecker, ACCResult> super; 2560 2561 ASTContext &Context; 2562 ARCConversionTypeClass SourceClass; 2563 ARCConversionTypeClass TargetClass; 2564 2565 static bool isCFType(QualType type) { 2566 // Someday this can use ns_bridged. For now, it has to do this. 2567 return type->isCARCBridgableType(); 2568 } 2569 2570 public: 2571 ARCCastChecker(ASTContext &Context, ARCConversionTypeClass source, 2572 ARCConversionTypeClass target) 2573 : Context(Context), SourceClass(source), TargetClass(target) {} 2574 2575 using super::Visit; 2576 ACCResult Visit(Expr *e) { 2577 return super::Visit(e->IgnoreParens()); 2578 } 2579 2580 ACCResult VisitStmt(Stmt *s) { 2581 return ACC_invalid; 2582 } 2583 2584 /// Null pointer constants can be casted however you please. 2585 ACCResult VisitExpr(Expr *e) { 2586 if (e->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull)) 2587 return ACC_bottom; 2588 return ACC_invalid; 2589 } 2590 2591 /// Objective-C string literals can be safely casted. 2592 ACCResult VisitObjCStringLiteral(ObjCStringLiteral *e) { 2593 // If we're casting to any retainable type, go ahead. Global 2594 // strings are immune to retains, so this is bottom. 2595 if (isAnyRetainable(TargetClass)) return ACC_bottom; 2596 2597 return ACC_invalid; 2598 } 2599 2600 /// Look through certain implicit and explicit casts. 2601 ACCResult VisitCastExpr(CastExpr *e) { 2602 switch (e->getCastKind()) { 2603 case CK_NullToPointer: 2604 return ACC_bottom; 2605 2606 case CK_NoOp: 2607 case CK_LValueToRValue: 2608 case CK_BitCast: 2609 case CK_CPointerToObjCPointerCast: 2610 case CK_BlockPointerToObjCPointerCast: 2611 case CK_AnyPointerToBlockPointerCast: 2612 return Visit(e->getSubExpr()); 2613 2614 default: 2615 return ACC_invalid; 2616 } 2617 } 2618 2619 /// Look through unary extension. 2620 ACCResult VisitUnaryExtension(UnaryOperator *e) { 2621 return Visit(e->getSubExpr()); 2622 } 2623 2624 /// Ignore the LHS of a comma operator. 2625 ACCResult VisitBinComma(BinaryOperator *e) { 2626 return Visit(e->getRHS()); 2627 } 2628 2629 /// Conditional operators are okay if both sides are okay. 2630 ACCResult VisitConditionalOperator(ConditionalOperator *e) { 2631 ACCResult left = Visit(e->getTrueExpr()); 2632 if (left == ACC_invalid) return ACC_invalid; 2633 return merge(left, Visit(e->getFalseExpr())); 2634 } 2635 2636 /// Look through pseudo-objects. 2637 ACCResult VisitPseudoObjectExpr(PseudoObjectExpr *e) { 2638 // If we're getting here, we should always have a result. 2639 return Visit(e->getResultExpr()); 2640 } 2641 2642 /// Statement expressions are okay if their result expression is okay. 2643 ACCResult VisitStmtExpr(StmtExpr *e) { 2644 return Visit(e->getSubStmt()->body_back()); 2645 } 2646 2647 /// Some declaration references are okay. 2648 ACCResult VisitDeclRefExpr(DeclRefExpr *e) { 2649 // References to global constants from system headers are okay. 2650 // These are things like 'kCFStringTransformToLatin'. They are 2651 // can also be assumed to be immune to retains. 2652 VarDecl *var = dyn_cast<VarDecl>(e->getDecl()); 2653 if (isAnyRetainable(TargetClass) && 2654 isAnyRetainable(SourceClass) && 2655 var && 2656 var->getStorageClass() == SC_Extern && 2657 var->getType().isConstQualified() && 2658 Context.getSourceManager().isInSystemHeader(var->getLocation())) { 2659 return ACC_bottom; 2660 } 2661 2662 // Nothing else. 2663 return ACC_invalid; 2664 } 2665 2666 /// Some calls are okay. 2667 ACCResult VisitCallExpr(CallExpr *e) { 2668 if (FunctionDecl *fn = e->getDirectCallee()) 2669 if (ACCResult result = checkCallToFunction(fn)) 2670 return result; 2671 2672 return super::VisitCallExpr(e); 2673 } 2674 2675 ACCResult checkCallToFunction(FunctionDecl *fn) { 2676 // Require a CF*Ref return type. 2677 if (!isCFType(fn->getResultType())) 2678 return ACC_invalid; 2679 2680 if (!isAnyRetainable(TargetClass)) 2681 return ACC_invalid; 2682 2683 // Honor an explicit 'not retained' attribute. 2684 if (fn->hasAttr<CFReturnsNotRetainedAttr>()) 2685 return ACC_plusZero; 2686 2687 // Honor an explicit 'retained' attribute, except that for 2688 // now we're not going to permit implicit handling of +1 results, 2689 // because it's a bit frightening. 2690 if (fn->hasAttr<CFReturnsRetainedAttr>()) 2691 return ACC_invalid; // ACC_plusOne if we start accepting this 2692 2693 // Recognize this specific builtin function, which is used by CFSTR. 2694 unsigned builtinID = fn->getBuiltinID(); 2695 if (builtinID == Builtin::BI__builtin___CFStringMakeConstantString) 2696 return ACC_bottom; 2697 2698 // Otherwise, don't do anything implicit with an unaudited function. 2699 if (!fn->hasAttr<CFAuditedTransferAttr>()) 2700 return ACC_invalid; 2701 2702 // Otherwise, it's +0 unless it follows the create convention. 2703 if (ento::coreFoundation::followsCreateRule(fn)) 2704 return ACC_invalid; // ACC_plusOne if we start accepting this 2705 2706 return ACC_plusZero; 2707 } 2708 2709 ACCResult VisitObjCMessageExpr(ObjCMessageExpr *e) { 2710 return checkCallToMethod(e->getMethodDecl()); 2711 } 2712 2713 ACCResult VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *e) { 2714 ObjCMethodDecl *method; 2715 if (e->isExplicitProperty()) 2716 method = e->getExplicitProperty()->getGetterMethodDecl(); 2717 else 2718 method = e->getImplicitPropertyGetter(); 2719 return checkCallToMethod(method); 2720 } 2721 2722 ACCResult checkCallToMethod(ObjCMethodDecl *method) { 2723 if (!method) return ACC_invalid; 2724 2725 // Check for message sends to functions returning CF types. We 2726 // just obey the Cocoa conventions with these, even though the 2727 // return type is CF. 2728 if (!isAnyRetainable(TargetClass) || !isCFType(method->getResultType())) 2729 return ACC_invalid; 2730 2731 // If the method is explicitly marked not-retained, it's +0. 2732 if (method->hasAttr<CFReturnsNotRetainedAttr>()) 2733 return ACC_plusZero; 2734 2735 // If the method is explicitly marked as returning retained, or its 2736 // selector follows a +1 Cocoa convention, treat it as +1. 2737 if (method->hasAttr<CFReturnsRetainedAttr>()) 2738 return ACC_plusOne; 2739 2740 switch (method->getSelector().getMethodFamily()) { 2741 case OMF_alloc: 2742 case OMF_copy: 2743 case OMF_mutableCopy: 2744 case OMF_new: 2745 return ACC_plusOne; 2746 2747 default: 2748 // Otherwise, treat it as +0. 2749 return ACC_plusZero; 2750 } 2751 } 2752 }; 2753} 2754 2755static bool 2756KnownName(Sema &S, const char *name) { 2757 LookupResult R(S, &S.Context.Idents.get(name), SourceLocation(), 2758 Sema::LookupOrdinaryName); 2759 return S.LookupName(R, S.TUScope, false); 2760} 2761 2762static void addFixitForObjCARCConversion(Sema &S, 2763 DiagnosticBuilder &DiagB, 2764 Sema::CheckedConversionKind CCK, 2765 SourceLocation afterLParen, 2766 QualType castType, 2767 Expr *castExpr, 2768 const char *bridgeKeyword, 2769 const char *CFBridgeName) { 2770 // We handle C-style and implicit casts here. 2771 switch (CCK) { 2772 case Sema::CCK_ImplicitConversion: 2773 case Sema::CCK_CStyleCast: 2774 break; 2775 case Sema::CCK_FunctionalCast: 2776 case Sema::CCK_OtherCast: 2777 return; 2778 } 2779 2780 if (CFBridgeName) { 2781 Expr *castedE = castExpr; 2782 if (CStyleCastExpr *CCE = dyn_cast<CStyleCastExpr>(castedE)) 2783 castedE = CCE->getSubExpr(); 2784 castedE = castedE->IgnoreImpCasts(); 2785 SourceRange range = castedE->getSourceRange(); 2786 if (isa<ParenExpr>(castedE)) { 2787 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(), 2788 CFBridgeName)); 2789 } else { 2790 std::string namePlusParen = CFBridgeName; 2791 namePlusParen += "("; 2792 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(), 2793 namePlusParen)); 2794 DiagB.AddFixItHint(FixItHint::CreateInsertion( 2795 S.PP.getLocForEndOfToken(range.getEnd()), 2796 ")")); 2797 } 2798 return; 2799 } 2800 2801 if (CCK == Sema::CCK_CStyleCast) { 2802 DiagB.AddFixItHint(FixItHint::CreateInsertion(afterLParen, bridgeKeyword)); 2803 } else { 2804 std::string castCode = "("; 2805 castCode += bridgeKeyword; 2806 castCode += castType.getAsString(); 2807 castCode += ")"; 2808 Expr *castedE = castExpr->IgnoreImpCasts(); 2809 SourceRange range = castedE->getSourceRange(); 2810 if (isa<ParenExpr>(castedE)) { 2811 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(), 2812 castCode)); 2813 } else { 2814 castCode += "("; 2815 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(), 2816 castCode)); 2817 DiagB.AddFixItHint(FixItHint::CreateInsertion( 2818 S.PP.getLocForEndOfToken(range.getEnd()), 2819 ")")); 2820 } 2821 } 2822} 2823 2824static void 2825diagnoseObjCARCConversion(Sema &S, SourceRange castRange, 2826 QualType castType, ARCConversionTypeClass castACTC, 2827 Expr *castExpr, ARCConversionTypeClass exprACTC, 2828 Sema::CheckedConversionKind CCK) { 2829 SourceLocation loc = 2830 (castRange.isValid() ? castRange.getBegin() : castExpr->getExprLoc()); 2831 2832 if (S.makeUnavailableInSystemHeader(loc, 2833 "converts between Objective-C and C pointers in -fobjc-arc")) 2834 return; 2835 2836 QualType castExprType = castExpr->getType(); 2837 2838 unsigned srcKind = 0; 2839 switch (exprACTC) { 2840 case ACTC_none: 2841 case ACTC_coreFoundation: 2842 case ACTC_voidPtr: 2843 srcKind = (castExprType->isPointerType() ? 1 : 0); 2844 break; 2845 case ACTC_retainable: 2846 srcKind = (castExprType->isBlockPointerType() ? 2 : 3); 2847 break; 2848 case ACTC_indirectRetainable: 2849 srcKind = 4; 2850 break; 2851 } 2852 2853 // Check whether this could be fixed with a bridge cast. 2854 SourceLocation afterLParen = S.PP.getLocForEndOfToken(castRange.getBegin()); 2855 SourceLocation noteLoc = afterLParen.isValid() ? afterLParen : loc; 2856 2857 // Bridge from an ARC type to a CF type. 2858 if (castACTC == ACTC_retainable && isAnyRetainable(exprACTC)) { 2859 2860 S.Diag(loc, diag::err_arc_cast_requires_bridge) 2861 << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit 2862 << 2 // of C pointer type 2863 << castExprType 2864 << unsigned(castType->isBlockPointerType()) // to ObjC|block type 2865 << castType 2866 << castRange 2867 << castExpr->getSourceRange(); 2868 bool br = KnownName(S, "CFBridgingRelease"); 2869 { 2870 DiagnosticBuilder DiagB = S.Diag(noteLoc, diag::note_arc_bridge); 2871 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen, 2872 castType, castExpr, "__bridge ", 0); 2873 } 2874 { 2875 DiagnosticBuilder DiagB = S.Diag(noteLoc, diag::note_arc_bridge_transfer) 2876 << castExprType << br; 2877 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen, 2878 castType, castExpr, "__bridge_transfer ", 2879 br ? "CFBridgingRelease" : 0); 2880 } 2881 2882 return; 2883 } 2884 2885 // Bridge from a CF type to an ARC type. 2886 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC)) { 2887 bool br = KnownName(S, "CFBridgingRetain"); 2888 S.Diag(loc, diag::err_arc_cast_requires_bridge) 2889 << unsigned(CCK == Sema::CCK_ImplicitConversion) // cast|implicit 2890 << unsigned(castExprType->isBlockPointerType()) // of ObjC|block type 2891 << castExprType 2892 << 2 // to C pointer type 2893 << castType 2894 << castRange 2895 << castExpr->getSourceRange(); 2896 2897 { 2898 DiagnosticBuilder DiagB = S.Diag(noteLoc, diag::note_arc_bridge); 2899 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen, 2900 castType, castExpr, "__bridge ", 0); 2901 } 2902 { 2903 DiagnosticBuilder DiagB = S.Diag(noteLoc, diag::note_arc_bridge_retained) 2904 << castType << br; 2905 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen, 2906 castType, castExpr, "__bridge_retained ", 2907 br ? "CFBridgingRetain" : 0); 2908 } 2909 2910 return; 2911 } 2912 2913 S.Diag(loc, diag::err_arc_mismatched_cast) 2914 << (CCK != Sema::CCK_ImplicitConversion) 2915 << srcKind << castExprType << castType 2916 << castRange << castExpr->getSourceRange(); 2917} 2918 2919Sema::ARCConversionResult 2920Sema::CheckObjCARCConversion(SourceRange castRange, QualType castType, 2921 Expr *&castExpr, CheckedConversionKind CCK) { 2922 QualType castExprType = castExpr->getType(); 2923 2924 // For the purposes of the classification, we assume reference types 2925 // will bind to temporaries. 2926 QualType effCastType = castType; 2927 if (const ReferenceType *ref = castType->getAs<ReferenceType>()) 2928 effCastType = ref->getPointeeType(); 2929 2930 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExprType); 2931 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(effCastType); 2932 if (exprACTC == castACTC) { 2933 // check for viablity and report error if casting an rvalue to a 2934 // life-time qualifier. 2935 if ((castACTC == ACTC_retainable) && 2936 (CCK == CCK_CStyleCast || CCK == CCK_OtherCast) && 2937 (castType != castExprType)) { 2938 const Type *DT = castType.getTypePtr(); 2939 QualType QDT = castType; 2940 // We desugar some types but not others. We ignore those 2941 // that cannot happen in a cast; i.e. auto, and those which 2942 // should not be de-sugared; i.e typedef. 2943 if (const ParenType *PT = dyn_cast<ParenType>(DT)) 2944 QDT = PT->desugar(); 2945 else if (const TypeOfType *TP = dyn_cast<TypeOfType>(DT)) 2946 QDT = TP->desugar(); 2947 else if (const AttributedType *AT = dyn_cast<AttributedType>(DT)) 2948 QDT = AT->desugar(); 2949 if (QDT != castType && 2950 QDT.getObjCLifetime() != Qualifiers::OCL_None) { 2951 SourceLocation loc = 2952 (castRange.isValid() ? castRange.getBegin() 2953 : castExpr->getExprLoc()); 2954 Diag(loc, diag::err_arc_nolifetime_behavior); 2955 } 2956 } 2957 return ACR_okay; 2958 } 2959 2960 if (isAnyCLike(exprACTC) && isAnyCLike(castACTC)) return ACR_okay; 2961 2962 // Allow all of these types to be cast to integer types (but not 2963 // vice-versa). 2964 if (castACTC == ACTC_none && castType->isIntegralType(Context)) 2965 return ACR_okay; 2966 2967 // Allow casts between pointers to lifetime types (e.g., __strong id*) 2968 // and pointers to void (e.g., cv void *). Casting from void* to lifetime* 2969 // must be explicit. 2970 if (exprACTC == ACTC_indirectRetainable && castACTC == ACTC_voidPtr) 2971 return ACR_okay; 2972 if (castACTC == ACTC_indirectRetainable && exprACTC == ACTC_voidPtr && 2973 CCK != CCK_ImplicitConversion) 2974 return ACR_okay; 2975 2976 switch (ARCCastChecker(Context, exprACTC, castACTC).Visit(castExpr)) { 2977 // For invalid casts, fall through. 2978 case ACC_invalid: 2979 break; 2980 2981 // Do nothing for both bottom and +0. 2982 case ACC_bottom: 2983 case ACC_plusZero: 2984 return ACR_okay; 2985 2986 // If the result is +1, consume it here. 2987 case ACC_plusOne: 2988 castExpr = ImplicitCastExpr::Create(Context, castExpr->getType(), 2989 CK_ARCConsumeObject, castExpr, 2990 0, VK_RValue); 2991 ExprNeedsCleanups = true; 2992 return ACR_okay; 2993 } 2994 2995 // If this is a non-implicit cast from id or block type to a 2996 // CoreFoundation type, delay complaining in case the cast is used 2997 // in an acceptable context. 2998 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC) && 2999 CCK != CCK_ImplicitConversion) 3000 return ACR_unbridged; 3001 3002 diagnoseObjCARCConversion(*this, castRange, castType, castACTC, 3003 castExpr, exprACTC, CCK); 3004 return ACR_okay; 3005} 3006 3007/// Given that we saw an expression with the ARCUnbridgedCastTy 3008/// placeholder type, complain bitterly. 3009void Sema::diagnoseARCUnbridgedCast(Expr *e) { 3010 // We expect the spurious ImplicitCastExpr to already have been stripped. 3011 assert(!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)); 3012 CastExpr *realCast = cast<CastExpr>(e->IgnoreParens()); 3013 3014 SourceRange castRange; 3015 QualType castType; 3016 CheckedConversionKind CCK; 3017 3018 if (CStyleCastExpr *cast = dyn_cast<CStyleCastExpr>(realCast)) { 3019 castRange = SourceRange(cast->getLParenLoc(), cast->getRParenLoc()); 3020 castType = cast->getTypeAsWritten(); 3021 CCK = CCK_CStyleCast; 3022 } else if (ExplicitCastExpr *cast = dyn_cast<ExplicitCastExpr>(realCast)) { 3023 castRange = cast->getTypeInfoAsWritten()->getTypeLoc().getSourceRange(); 3024 castType = cast->getTypeAsWritten(); 3025 CCK = CCK_OtherCast; 3026 } else { 3027 castType = cast->getType(); 3028 CCK = CCK_ImplicitConversion; 3029 } 3030 3031 ARCConversionTypeClass castACTC = 3032 classifyTypeForARCConversion(castType.getNonReferenceType()); 3033 3034 Expr *castExpr = realCast->getSubExpr(); 3035 assert(classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable); 3036 3037 diagnoseObjCARCConversion(*this, castRange, castType, castACTC, 3038 castExpr, ACTC_retainable, CCK); 3039} 3040 3041/// stripARCUnbridgedCast - Given an expression of ARCUnbridgedCast 3042/// type, remove the placeholder cast. 3043Expr *Sema::stripARCUnbridgedCast(Expr *e) { 3044 assert(e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)); 3045 3046 if (ParenExpr *pe = dyn_cast<ParenExpr>(e)) { 3047 Expr *sub = stripARCUnbridgedCast(pe->getSubExpr()); 3048 return new (Context) ParenExpr(pe->getLParen(), pe->getRParen(), sub); 3049 } else if (UnaryOperator *uo = dyn_cast<UnaryOperator>(e)) { 3050 assert(uo->getOpcode() == UO_Extension); 3051 Expr *sub = stripARCUnbridgedCast(uo->getSubExpr()); 3052 return new (Context) UnaryOperator(sub, UO_Extension, sub->getType(), 3053 sub->getValueKind(), sub->getObjectKind(), 3054 uo->getOperatorLoc()); 3055 } else if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) { 3056 assert(!gse->isResultDependent()); 3057 3058 unsigned n = gse->getNumAssocs(); 3059 SmallVector<Expr*, 4> subExprs(n); 3060 SmallVector<TypeSourceInfo*, 4> subTypes(n); 3061 for (unsigned i = 0; i != n; ++i) { 3062 subTypes[i] = gse->getAssocTypeSourceInfo(i); 3063 Expr *sub = gse->getAssocExpr(i); 3064 if (i == gse->getResultIndex()) 3065 sub = stripARCUnbridgedCast(sub); 3066 subExprs[i] = sub; 3067 } 3068 3069 return new (Context) GenericSelectionExpr(Context, gse->getGenericLoc(), 3070 gse->getControllingExpr(), 3071 subTypes.data(), subExprs.data(), 3072 n, gse->getDefaultLoc(), 3073 gse->getRParenLoc(), 3074 gse->containsUnexpandedParameterPack(), 3075 gse->getResultIndex()); 3076 } else { 3077 assert(isa<ImplicitCastExpr>(e) && "bad form of unbridged cast!"); 3078 return cast<ImplicitCastExpr>(e)->getSubExpr(); 3079 } 3080} 3081 3082bool Sema::CheckObjCARCUnavailableWeakConversion(QualType castType, 3083 QualType exprType) { 3084 QualType canCastType = 3085 Context.getCanonicalType(castType).getUnqualifiedType(); 3086 QualType canExprType = 3087 Context.getCanonicalType(exprType).getUnqualifiedType(); 3088 if (isa<ObjCObjectPointerType>(canCastType) && 3089 castType.getObjCLifetime() == Qualifiers::OCL_Weak && 3090 canExprType->isObjCObjectPointerType()) { 3091 if (const ObjCObjectPointerType *ObjT = 3092 canExprType->getAs<ObjCObjectPointerType>()) 3093 if (ObjT->getInterfaceDecl()->isArcWeakrefUnavailable()) 3094 return false; 3095 } 3096 return true; 3097} 3098 3099/// Look for an ObjCReclaimReturnedObject cast and destroy it. 3100static Expr *maybeUndoReclaimObject(Expr *e) { 3101 // For now, we just undo operands that are *immediately* reclaim 3102 // expressions, which prevents the vast majority of potential 3103 // problems here. To catch them all, we'd need to rebuild arbitrary 3104 // value-propagating subexpressions --- we can't reliably rebuild 3105 // in-place because of expression sharing. 3106 if (ImplicitCastExpr *ice = dyn_cast<ImplicitCastExpr>(e)) 3107 if (ice->getCastKind() == CK_ARCReclaimReturnedObject) 3108 return ice->getSubExpr(); 3109 3110 return e; 3111} 3112 3113ExprResult Sema::BuildObjCBridgedCast(SourceLocation LParenLoc, 3114 ObjCBridgeCastKind Kind, 3115 SourceLocation BridgeKeywordLoc, 3116 TypeSourceInfo *TSInfo, 3117 Expr *SubExpr) { 3118 ExprResult SubResult = UsualUnaryConversions(SubExpr); 3119 if (SubResult.isInvalid()) return ExprError(); 3120 SubExpr = SubResult.take(); 3121 3122 QualType T = TSInfo->getType(); 3123 QualType FromType = SubExpr->getType(); 3124 3125 CastKind CK; 3126 3127 bool MustConsume = false; 3128 if (T->isDependentType() || SubExpr->isTypeDependent()) { 3129 // Okay: we'll build a dependent expression type. 3130 CK = CK_Dependent; 3131 } else if (T->isObjCARCBridgableType() && FromType->isCARCBridgableType()) { 3132 // Casting CF -> id 3133 CK = (T->isBlockPointerType() ? CK_AnyPointerToBlockPointerCast 3134 : CK_CPointerToObjCPointerCast); 3135 switch (Kind) { 3136 case OBC_Bridge: 3137 break; 3138 3139 case OBC_BridgeRetained: { 3140 bool br = KnownName(*this, "CFBridgingRelease"); 3141 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind) 3142 << 2 3143 << FromType 3144 << (T->isBlockPointerType()? 1 : 0) 3145 << T 3146 << SubExpr->getSourceRange() 3147 << Kind; 3148 Diag(BridgeKeywordLoc, diag::note_arc_bridge) 3149 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge"); 3150 Diag(BridgeKeywordLoc, diag::note_arc_bridge_transfer) 3151 << FromType << br 3152 << FixItHint::CreateReplacement(BridgeKeywordLoc, 3153 br ? "CFBridgingRelease " 3154 : "__bridge_transfer "); 3155 3156 Kind = OBC_Bridge; 3157 break; 3158 } 3159 3160 case OBC_BridgeTransfer: 3161 // We must consume the Objective-C object produced by the cast. 3162 MustConsume = true; 3163 break; 3164 } 3165 } else if (T->isCARCBridgableType() && FromType->isObjCARCBridgableType()) { 3166 // Okay: id -> CF 3167 CK = CK_BitCast; 3168 switch (Kind) { 3169 case OBC_Bridge: 3170 // Reclaiming a value that's going to be __bridge-casted to CF 3171 // is very dangerous, so we don't do it. 3172 SubExpr = maybeUndoReclaimObject(SubExpr); 3173 break; 3174 3175 case OBC_BridgeRetained: 3176 // Produce the object before casting it. 3177 SubExpr = ImplicitCastExpr::Create(Context, FromType, 3178 CK_ARCProduceObject, 3179 SubExpr, 0, VK_RValue); 3180 break; 3181 3182 case OBC_BridgeTransfer: { 3183 bool br = KnownName(*this, "CFBridgingRetain"); 3184 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind) 3185 << (FromType->isBlockPointerType()? 1 : 0) 3186 << FromType 3187 << 2 3188 << T 3189 << SubExpr->getSourceRange() 3190 << Kind; 3191 3192 Diag(BridgeKeywordLoc, diag::note_arc_bridge) 3193 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge "); 3194 Diag(BridgeKeywordLoc, diag::note_arc_bridge_retained) 3195 << T << br 3196 << FixItHint::CreateReplacement(BridgeKeywordLoc, 3197 br ? "CFBridgingRetain " : "__bridge_retained"); 3198 3199 Kind = OBC_Bridge; 3200 break; 3201 } 3202 } 3203 } else { 3204 Diag(LParenLoc, diag::err_arc_bridge_cast_incompatible) 3205 << FromType << T << Kind 3206 << SubExpr->getSourceRange() 3207 << TSInfo->getTypeLoc().getSourceRange(); 3208 return ExprError(); 3209 } 3210 3211 Expr *Result = new (Context) ObjCBridgedCastExpr(LParenLoc, Kind, CK, 3212 BridgeKeywordLoc, 3213 TSInfo, SubExpr); 3214 3215 if (MustConsume) { 3216 ExprNeedsCleanups = true; 3217 Result = ImplicitCastExpr::Create(Context, T, CK_ARCConsumeObject, Result, 3218 0, VK_RValue); 3219 } 3220 3221 return Result; 3222} 3223 3224ExprResult Sema::ActOnObjCBridgedCast(Scope *S, 3225 SourceLocation LParenLoc, 3226 ObjCBridgeCastKind Kind, 3227 SourceLocation BridgeKeywordLoc, 3228 ParsedType Type, 3229 SourceLocation RParenLoc, 3230 Expr *SubExpr) { 3231 TypeSourceInfo *TSInfo = 0; 3232 QualType T = GetTypeFromParser(Type, &TSInfo); 3233 if (!TSInfo) 3234 TSInfo = Context.getTrivialTypeSourceInfo(T, LParenLoc); 3235 return BuildObjCBridgedCast(LParenLoc, Kind, BridgeKeywordLoc, TSInfo, 3236 SubExpr); 3237} 3238