1 //===--- SemaExprObjC.cpp - Semantic Analysis for ObjC Expressions --------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file implements semantic analysis for Objective-C expressions. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "clang/Sema/SemaInternal.h" 14 #include "clang/AST/ASTContext.h" 15 #include "clang/AST/DeclObjC.h" 16 #include "clang/AST/ExprObjC.h" 17 #include "clang/AST/StmtVisitor.h" 18 #include "clang/AST/TypeLoc.h" 19 #include "clang/Analysis/DomainSpecific/CocoaConventions.h" 20 #include "clang/Edit/Commit.h" 21 #include "clang/Edit/Rewriters.h" 22 #include "clang/Lex/Preprocessor.h" 23 #include "clang/Sema/Initialization.h" 24 #include "clang/Sema/Lookup.h" 25 #include "clang/Sema/Scope.h" 26 #include "clang/Sema/ScopeInfo.h" 27 #include "llvm/ADT/SmallString.h" 28 #include "llvm/Support/ConvertUTF.h" 29 30 using namespace clang; 31 using namespace sema; 32 using llvm::makeArrayRef; 33 34 ExprResult Sema::ParseObjCStringLiteral(SourceLocation *AtLocs, 35 ArrayRef<Expr *> Strings) { 36 // Most ObjC strings are formed out of a single piece. However, we *can* 37 // have strings formed out of multiple @ strings with multiple pptokens in 38 // each one, e.g. @"foo" "bar" @"baz" "qux" which need to be turned into one 39 // StringLiteral for ObjCStringLiteral to hold onto. 40 StringLiteral *S = cast<StringLiteral>(Strings[0]); 41 42 // If we have a multi-part string, merge it all together. 43 if (Strings.size() != 1) { 44 // Concatenate objc strings. 45 SmallString<128> StrBuf; 46 SmallVector<SourceLocation, 8> StrLocs; 47 48 for (Expr *E : Strings) { 49 S = cast<StringLiteral>(E); 50 51 // ObjC strings can't be wide or UTF. 52 if (!S->isAscii()) { 53 Diag(S->getBeginLoc(), diag::err_cfstring_literal_not_string_constant) 54 << S->getSourceRange(); 55 return true; 56 } 57 58 // Append the string. 59 StrBuf += S->getString(); 60 61 // Get the locations of the string tokens. 62 StrLocs.append(S->tokloc_begin(), S->tokloc_end()); 63 } 64 65 // Create the aggregate string with the appropriate content and location 66 // information. 67 const ConstantArrayType *CAT = Context.getAsConstantArrayType(S->getType()); 68 assert(CAT && "String literal not of constant array type!"); 69 QualType StrTy = Context.getConstantArrayType( 70 CAT->getElementType(), llvm::APInt(32, StrBuf.size() + 1), 71 CAT->getSizeModifier(), CAT->getIndexTypeCVRQualifiers()); 72 S = StringLiteral::Create(Context, StrBuf, StringLiteral::Ascii, 73 /*Pascal=*/false, StrTy, &StrLocs[0], 74 StrLocs.size()); 75 } 76 77 return BuildObjCStringLiteral(AtLocs[0], S); 78 } 79 80 ExprResult Sema::BuildObjCStringLiteral(SourceLocation AtLoc, StringLiteral *S){ 81 // Verify that this composite string is acceptable for ObjC strings. 82 if (CheckObjCString(S)) 83 return true; 84 85 // Initialize the constant string interface lazily. This assumes 86 // the NSString interface is seen in this translation unit. Note: We 87 // don't use NSConstantString, since the runtime team considers this 88 // interface private (even though it appears in the header files). 89 QualType Ty = Context.getObjCConstantStringInterface(); 90 if (!Ty.isNull()) { 91 Ty = Context.getObjCObjectPointerType(Ty); 92 } else if (getLangOpts().NoConstantCFStrings) { 93 IdentifierInfo *NSIdent=nullptr; 94 std::string StringClass(getLangOpts().ObjCConstantStringClass); 95 96 if (StringClass.empty()) 97 NSIdent = &Context.Idents.get("NSConstantString"); 98 else 99 NSIdent = &Context.Idents.get(StringClass); 100 101 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc, 102 LookupOrdinaryName); 103 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) { 104 Context.setObjCConstantStringInterface(StrIF); 105 Ty = Context.getObjCConstantStringInterface(); 106 Ty = Context.getObjCObjectPointerType(Ty); 107 } else { 108 // If there is no NSConstantString interface defined then treat this 109 // as error and recover from it. 110 Diag(S->getBeginLoc(), diag::err_no_nsconstant_string_class) 111 << NSIdent << S->getSourceRange(); 112 Ty = Context.getObjCIdType(); 113 } 114 } else { 115 IdentifierInfo *NSIdent = NSAPIObj->getNSClassId(NSAPI::ClassId_NSString); 116 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, AtLoc, 117 LookupOrdinaryName); 118 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) { 119 Context.setObjCConstantStringInterface(StrIF); 120 Ty = Context.getObjCConstantStringInterface(); 121 Ty = Context.getObjCObjectPointerType(Ty); 122 } else { 123 // If there is no NSString interface defined, implicitly declare 124 // a @class NSString; and use that instead. This is to make sure 125 // type of an NSString literal is represented correctly, instead of 126 // being an 'id' type. 127 Ty = Context.getObjCNSStringType(); 128 if (Ty.isNull()) { 129 ObjCInterfaceDecl *NSStringIDecl = 130 ObjCInterfaceDecl::Create (Context, 131 Context.getTranslationUnitDecl(), 132 SourceLocation(), NSIdent, 133 nullptr, nullptr, SourceLocation()); 134 Ty = Context.getObjCInterfaceType(NSStringIDecl); 135 Context.setObjCNSStringType(Ty); 136 } 137 Ty = Context.getObjCObjectPointerType(Ty); 138 } 139 } 140 141 return new (Context) ObjCStringLiteral(S, Ty, AtLoc); 142 } 143 144 /// Emits an error if the given method does not exist, or if the return 145 /// type is not an Objective-C object. 146 static bool validateBoxingMethod(Sema &S, SourceLocation Loc, 147 const ObjCInterfaceDecl *Class, 148 Selector Sel, const ObjCMethodDecl *Method) { 149 if (!Method) { 150 // FIXME: Is there a better way to avoid quotes than using getName()? 151 S.Diag(Loc, diag::err_undeclared_boxing_method) << Sel << Class->getName(); 152 return false; 153 } 154 155 // Make sure the return type is reasonable. 156 QualType ReturnType = Method->getReturnType(); 157 if (!ReturnType->isObjCObjectPointerType()) { 158 S.Diag(Loc, diag::err_objc_literal_method_sig) 159 << Sel; 160 S.Diag(Method->getLocation(), diag::note_objc_literal_method_return) 161 << ReturnType; 162 return false; 163 } 164 165 return true; 166 } 167 168 /// Maps ObjCLiteralKind to NSClassIdKindKind 169 static NSAPI::NSClassIdKindKind ClassKindFromLiteralKind( 170 Sema::ObjCLiteralKind LiteralKind) { 171 switch (LiteralKind) { 172 case Sema::LK_Array: 173 return NSAPI::ClassId_NSArray; 174 case Sema::LK_Dictionary: 175 return NSAPI::ClassId_NSDictionary; 176 case Sema::LK_Numeric: 177 return NSAPI::ClassId_NSNumber; 178 case Sema::LK_String: 179 return NSAPI::ClassId_NSString; 180 case Sema::LK_Boxed: 181 return NSAPI::ClassId_NSValue; 182 183 // there is no corresponding matching 184 // between LK_None/LK_Block and NSClassIdKindKind 185 case Sema::LK_Block: 186 case Sema::LK_None: 187 break; 188 } 189 llvm_unreachable("LiteralKind can't be converted into a ClassKind"); 190 } 191 192 /// Validates ObjCInterfaceDecl availability. 193 /// ObjCInterfaceDecl, used to create ObjC literals, should be defined 194 /// if clang not in a debugger mode. 195 static bool ValidateObjCLiteralInterfaceDecl(Sema &S, ObjCInterfaceDecl *Decl, 196 SourceLocation Loc, 197 Sema::ObjCLiteralKind LiteralKind) { 198 if (!Decl) { 199 NSAPI::NSClassIdKindKind Kind = ClassKindFromLiteralKind(LiteralKind); 200 IdentifierInfo *II = S.NSAPIObj->getNSClassId(Kind); 201 S.Diag(Loc, diag::err_undeclared_objc_literal_class) 202 << II->getName() << LiteralKind; 203 return false; 204 } else if (!Decl->hasDefinition() && !S.getLangOpts().DebuggerObjCLiteral) { 205 S.Diag(Loc, diag::err_undeclared_objc_literal_class) 206 << Decl->getName() << LiteralKind; 207 S.Diag(Decl->getLocation(), diag::note_forward_class); 208 return false; 209 } 210 211 return true; 212 } 213 214 /// Looks up ObjCInterfaceDecl of a given NSClassIdKindKind. 215 /// Used to create ObjC literals, such as NSDictionary (@{}), 216 /// NSArray (@[]) and Boxed Expressions (@()) 217 static ObjCInterfaceDecl *LookupObjCInterfaceDeclForLiteral(Sema &S, 218 SourceLocation Loc, 219 Sema::ObjCLiteralKind LiteralKind) { 220 NSAPI::NSClassIdKindKind ClassKind = ClassKindFromLiteralKind(LiteralKind); 221 IdentifierInfo *II = S.NSAPIObj->getNSClassId(ClassKind); 222 NamedDecl *IF = S.LookupSingleName(S.TUScope, II, Loc, 223 Sema::LookupOrdinaryName); 224 ObjCInterfaceDecl *ID = dyn_cast_or_null<ObjCInterfaceDecl>(IF); 225 if (!ID && S.getLangOpts().DebuggerObjCLiteral) { 226 ASTContext &Context = S.Context; 227 TranslationUnitDecl *TU = Context.getTranslationUnitDecl(); 228 ID = ObjCInterfaceDecl::Create (Context, TU, SourceLocation(), II, 229 nullptr, nullptr, SourceLocation()); 230 } 231 232 if (!ValidateObjCLiteralInterfaceDecl(S, ID, Loc, LiteralKind)) { 233 ID = nullptr; 234 } 235 236 return ID; 237 } 238 239 /// Retrieve the NSNumber factory method that should be used to create 240 /// an Objective-C literal for the given type. 241 static ObjCMethodDecl *getNSNumberFactoryMethod(Sema &S, SourceLocation Loc, 242 QualType NumberType, 243 bool isLiteral = false, 244 SourceRange R = SourceRange()) { 245 Optional<NSAPI::NSNumberLiteralMethodKind> Kind = 246 S.NSAPIObj->getNSNumberFactoryMethodKind(NumberType); 247 248 if (!Kind) { 249 if (isLiteral) { 250 S.Diag(Loc, diag::err_invalid_nsnumber_type) 251 << NumberType << R; 252 } 253 return nullptr; 254 } 255 256 // If we already looked up this method, we're done. 257 if (S.NSNumberLiteralMethods[*Kind]) 258 return S.NSNumberLiteralMethods[*Kind]; 259 260 Selector Sel = S.NSAPIObj->getNSNumberLiteralSelector(*Kind, 261 /*Instance=*/false); 262 263 ASTContext &CX = S.Context; 264 265 // Look up the NSNumber class, if we haven't done so already. It's cached 266 // in the Sema instance. 267 if (!S.NSNumberDecl) { 268 S.NSNumberDecl = LookupObjCInterfaceDeclForLiteral(S, Loc, 269 Sema::LK_Numeric); 270 if (!S.NSNumberDecl) { 271 return nullptr; 272 } 273 } 274 275 if (S.NSNumberPointer.isNull()) { 276 // generate the pointer to NSNumber type. 277 QualType NSNumberObject = CX.getObjCInterfaceType(S.NSNumberDecl); 278 S.NSNumberPointer = CX.getObjCObjectPointerType(NSNumberObject); 279 } 280 281 // Look for the appropriate method within NSNumber. 282 ObjCMethodDecl *Method = S.NSNumberDecl->lookupClassMethod(Sel); 283 if (!Method && S.getLangOpts().DebuggerObjCLiteral) { 284 // create a stub definition this NSNumber factory method. 285 TypeSourceInfo *ReturnTInfo = nullptr; 286 Method = 287 ObjCMethodDecl::Create(CX, SourceLocation(), SourceLocation(), Sel, 288 S.NSNumberPointer, ReturnTInfo, S.NSNumberDecl, 289 /*isInstance=*/false, /*isVariadic=*/false, 290 /*isPropertyAccessor=*/false, 291 /*isImplicitlyDeclared=*/true, 292 /*isDefined=*/false, ObjCMethodDecl::Required, 293 /*HasRelatedResultType=*/false); 294 ParmVarDecl *value = ParmVarDecl::Create(S.Context, Method, 295 SourceLocation(), SourceLocation(), 296 &CX.Idents.get("value"), 297 NumberType, /*TInfo=*/nullptr, 298 SC_None, nullptr); 299 Method->setMethodParams(S.Context, value, None); 300 } 301 302 if (!validateBoxingMethod(S, Loc, S.NSNumberDecl, Sel, Method)) 303 return nullptr; 304 305 // Note: if the parameter type is out-of-line, we'll catch it later in the 306 // implicit conversion. 307 308 S.NSNumberLiteralMethods[*Kind] = Method; 309 return Method; 310 } 311 312 /// BuildObjCNumericLiteral - builds an ObjCBoxedExpr AST node for the 313 /// numeric literal expression. Type of the expression will be "NSNumber *". 314 ExprResult Sema::BuildObjCNumericLiteral(SourceLocation AtLoc, Expr *Number) { 315 // Determine the type of the literal. 316 QualType NumberType = Number->getType(); 317 if (CharacterLiteral *Char = dyn_cast<CharacterLiteral>(Number)) { 318 // In C, character literals have type 'int'. That's not the type we want 319 // to use to determine the Objective-c literal kind. 320 switch (Char->getKind()) { 321 case CharacterLiteral::Ascii: 322 case CharacterLiteral::UTF8: 323 NumberType = Context.CharTy; 324 break; 325 326 case CharacterLiteral::Wide: 327 NumberType = Context.getWideCharType(); 328 break; 329 330 case CharacterLiteral::UTF16: 331 NumberType = Context.Char16Ty; 332 break; 333 334 case CharacterLiteral::UTF32: 335 NumberType = Context.Char32Ty; 336 break; 337 } 338 } 339 340 // Look for the appropriate method within NSNumber. 341 // Construct the literal. 342 SourceRange NR(Number->getSourceRange()); 343 ObjCMethodDecl *Method = getNSNumberFactoryMethod(*this, AtLoc, NumberType, 344 true, NR); 345 if (!Method) 346 return ExprError(); 347 348 // Convert the number to the type that the parameter expects. 349 ParmVarDecl *ParamDecl = Method->parameters()[0]; 350 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 351 ParamDecl); 352 ExprResult ConvertedNumber = PerformCopyInitialization(Entity, 353 SourceLocation(), 354 Number); 355 if (ConvertedNumber.isInvalid()) 356 return ExprError(); 357 Number = ConvertedNumber.get(); 358 359 // Use the effective source range of the literal, including the leading '@'. 360 return MaybeBindToTemporary( 361 new (Context) ObjCBoxedExpr(Number, NSNumberPointer, Method, 362 SourceRange(AtLoc, NR.getEnd()))); 363 } 364 365 ExprResult Sema::ActOnObjCBoolLiteral(SourceLocation AtLoc, 366 SourceLocation ValueLoc, 367 bool Value) { 368 ExprResult Inner; 369 if (getLangOpts().CPlusPlus) { 370 Inner = ActOnCXXBoolLiteral(ValueLoc, Value? tok::kw_true : tok::kw_false); 371 } else { 372 // C doesn't actually have a way to represent literal values of type 373 // _Bool. So, we'll use 0/1 and implicit cast to _Bool. 374 Inner = ActOnIntegerConstant(ValueLoc, Value? 1 : 0); 375 Inner = ImpCastExprToType(Inner.get(), Context.BoolTy, 376 CK_IntegralToBoolean); 377 } 378 379 return BuildObjCNumericLiteral(AtLoc, Inner.get()); 380 } 381 382 /// Check that the given expression is a valid element of an Objective-C 383 /// collection literal. 384 static ExprResult CheckObjCCollectionLiteralElement(Sema &S, Expr *Element, 385 QualType T, 386 bool ArrayLiteral = false) { 387 // If the expression is type-dependent, there's nothing for us to do. 388 if (Element->isTypeDependent()) 389 return Element; 390 391 ExprResult Result = S.CheckPlaceholderExpr(Element); 392 if (Result.isInvalid()) 393 return ExprError(); 394 Element = Result.get(); 395 396 // In C++, check for an implicit conversion to an Objective-C object pointer 397 // type. 398 if (S.getLangOpts().CPlusPlus && Element->getType()->isRecordType()) { 399 InitializedEntity Entity 400 = InitializedEntity::InitializeParameter(S.Context, T, 401 /*Consumed=*/false); 402 InitializationKind Kind = InitializationKind::CreateCopy( 403 Element->getBeginLoc(), SourceLocation()); 404 InitializationSequence Seq(S, Entity, Kind, Element); 405 if (!Seq.Failed()) 406 return Seq.Perform(S, Entity, Kind, Element); 407 } 408 409 Expr *OrigElement = Element; 410 411 // Perform lvalue-to-rvalue conversion. 412 Result = S.DefaultLvalueConversion(Element); 413 if (Result.isInvalid()) 414 return ExprError(); 415 Element = Result.get(); 416 417 // Make sure that we have an Objective-C pointer type or block. 418 if (!Element->getType()->isObjCObjectPointerType() && 419 !Element->getType()->isBlockPointerType()) { 420 bool Recovered = false; 421 422 // If this is potentially an Objective-C numeric literal, add the '@'. 423 if (isa<IntegerLiteral>(OrigElement) || 424 isa<CharacterLiteral>(OrigElement) || 425 isa<FloatingLiteral>(OrigElement) || 426 isa<ObjCBoolLiteralExpr>(OrigElement) || 427 isa<CXXBoolLiteralExpr>(OrigElement)) { 428 if (S.NSAPIObj->getNSNumberFactoryMethodKind(OrigElement->getType())) { 429 int Which = isa<CharacterLiteral>(OrigElement) ? 1 430 : (isa<CXXBoolLiteralExpr>(OrigElement) || 431 isa<ObjCBoolLiteralExpr>(OrigElement)) ? 2 432 : 3; 433 434 S.Diag(OrigElement->getBeginLoc(), diag::err_box_literal_collection) 435 << Which << OrigElement->getSourceRange() 436 << FixItHint::CreateInsertion(OrigElement->getBeginLoc(), "@"); 437 438 Result = 439 S.BuildObjCNumericLiteral(OrigElement->getBeginLoc(), OrigElement); 440 if (Result.isInvalid()) 441 return ExprError(); 442 443 Element = Result.get(); 444 Recovered = true; 445 } 446 } 447 // If this is potentially an Objective-C string literal, add the '@'. 448 else if (StringLiteral *String = dyn_cast<StringLiteral>(OrigElement)) { 449 if (String->isAscii()) { 450 S.Diag(OrigElement->getBeginLoc(), diag::err_box_literal_collection) 451 << 0 << OrigElement->getSourceRange() 452 << FixItHint::CreateInsertion(OrigElement->getBeginLoc(), "@"); 453 454 Result = S.BuildObjCStringLiteral(OrigElement->getBeginLoc(), String); 455 if (Result.isInvalid()) 456 return ExprError(); 457 458 Element = Result.get(); 459 Recovered = true; 460 } 461 } 462 463 if (!Recovered) { 464 S.Diag(Element->getBeginLoc(), diag::err_invalid_collection_element) 465 << Element->getType(); 466 return ExprError(); 467 } 468 } 469 if (ArrayLiteral) 470 if (ObjCStringLiteral *getString = 471 dyn_cast<ObjCStringLiteral>(OrigElement)) { 472 if (StringLiteral *SL = getString->getString()) { 473 unsigned numConcat = SL->getNumConcatenated(); 474 if (numConcat > 1) { 475 // Only warn if the concatenated string doesn't come from a macro. 476 bool hasMacro = false; 477 for (unsigned i = 0; i < numConcat ; ++i) 478 if (SL->getStrTokenLoc(i).isMacroID()) { 479 hasMacro = true; 480 break; 481 } 482 if (!hasMacro) 483 S.Diag(Element->getBeginLoc(), 484 diag::warn_concatenated_nsarray_literal) 485 << Element->getType(); 486 } 487 } 488 } 489 490 // Make sure that the element has the type that the container factory 491 // function expects. 492 return S.PerformCopyInitialization( 493 InitializedEntity::InitializeParameter(S.Context, T, 494 /*Consumed=*/false), 495 Element->getBeginLoc(), Element); 496 } 497 498 ExprResult Sema::BuildObjCBoxedExpr(SourceRange SR, Expr *ValueExpr) { 499 if (ValueExpr->isTypeDependent()) { 500 ObjCBoxedExpr *BoxedExpr = 501 new (Context) ObjCBoxedExpr(ValueExpr, Context.DependentTy, nullptr, SR); 502 return BoxedExpr; 503 } 504 ObjCMethodDecl *BoxingMethod = nullptr; 505 QualType BoxedType; 506 // Convert the expression to an RValue, so we can check for pointer types... 507 ExprResult RValue = DefaultFunctionArrayLvalueConversion(ValueExpr); 508 if (RValue.isInvalid()) { 509 return ExprError(); 510 } 511 SourceLocation Loc = SR.getBegin(); 512 ValueExpr = RValue.get(); 513 QualType ValueType(ValueExpr->getType()); 514 if (const PointerType *PT = ValueType->getAs<PointerType>()) { 515 QualType PointeeType = PT->getPointeeType(); 516 if (Context.hasSameUnqualifiedType(PointeeType, Context.CharTy)) { 517 518 if (!NSStringDecl) { 519 NSStringDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc, 520 Sema::LK_String); 521 if (!NSStringDecl) { 522 return ExprError(); 523 } 524 QualType NSStringObject = Context.getObjCInterfaceType(NSStringDecl); 525 NSStringPointer = Context.getObjCObjectPointerType(NSStringObject); 526 } 527 528 // The boxed expression can be emitted as a compile time constant if it is 529 // a string literal whose character encoding is compatible with UTF-8. 530 if (auto *CE = dyn_cast<ImplicitCastExpr>(ValueExpr)) 531 if (CE->getCastKind() == CK_ArrayToPointerDecay) 532 if (auto *SL = 533 dyn_cast<StringLiteral>(CE->getSubExpr()->IgnoreParens())) { 534 assert((SL->isAscii() || SL->isUTF8()) && 535 "unexpected character encoding"); 536 StringRef Str = SL->getString(); 537 const llvm::UTF8 *StrBegin = Str.bytes_begin(); 538 const llvm::UTF8 *StrEnd = Str.bytes_end(); 539 // Check that this is a valid UTF-8 string. 540 if (llvm::isLegalUTF8String(&StrBegin, StrEnd)) { 541 BoxedType = Context.getAttributedType( 542 AttributedType::getNullabilityAttrKind( 543 NullabilityKind::NonNull), 544 NSStringPointer, NSStringPointer); 545 return new (Context) ObjCBoxedExpr(CE, BoxedType, nullptr, SR); 546 } 547 548 Diag(SL->getBeginLoc(), diag::warn_objc_boxing_invalid_utf8_string) 549 << NSStringPointer << SL->getSourceRange(); 550 } 551 552 if (!StringWithUTF8StringMethod) { 553 IdentifierInfo *II = &Context.Idents.get("stringWithUTF8String"); 554 Selector stringWithUTF8String = Context.Selectors.getUnarySelector(II); 555 556 // Look for the appropriate method within NSString. 557 BoxingMethod = NSStringDecl->lookupClassMethod(stringWithUTF8String); 558 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) { 559 // Debugger needs to work even if NSString hasn't been defined. 560 TypeSourceInfo *ReturnTInfo = nullptr; 561 ObjCMethodDecl *M = ObjCMethodDecl::Create( 562 Context, SourceLocation(), SourceLocation(), stringWithUTF8String, 563 NSStringPointer, ReturnTInfo, NSStringDecl, 564 /*isInstance=*/false, /*isVariadic=*/false, 565 /*isPropertyAccessor=*/false, 566 /*isImplicitlyDeclared=*/true, 567 /*isDefined=*/false, ObjCMethodDecl::Required, 568 /*HasRelatedResultType=*/false); 569 QualType ConstCharType = Context.CharTy.withConst(); 570 ParmVarDecl *value = 571 ParmVarDecl::Create(Context, M, 572 SourceLocation(), SourceLocation(), 573 &Context.Idents.get("value"), 574 Context.getPointerType(ConstCharType), 575 /*TInfo=*/nullptr, 576 SC_None, nullptr); 577 M->setMethodParams(Context, value, None); 578 BoxingMethod = M; 579 } 580 581 if (!validateBoxingMethod(*this, Loc, NSStringDecl, 582 stringWithUTF8String, BoxingMethod)) 583 return ExprError(); 584 585 StringWithUTF8StringMethod = BoxingMethod; 586 } 587 588 BoxingMethod = StringWithUTF8StringMethod; 589 BoxedType = NSStringPointer; 590 // Transfer the nullability from method's return type. 591 Optional<NullabilityKind> Nullability = 592 BoxingMethod->getReturnType()->getNullability(Context); 593 if (Nullability) 594 BoxedType = Context.getAttributedType( 595 AttributedType::getNullabilityAttrKind(*Nullability), BoxedType, 596 BoxedType); 597 } 598 } else if (ValueType->isBuiltinType()) { 599 // The other types we support are numeric, char and BOOL/bool. We could also 600 // provide limited support for structure types, such as NSRange, NSRect, and 601 // NSSize. See NSValue (NSValueGeometryExtensions) in <Foundation/NSGeometry.h> 602 // for more details. 603 604 // Check for a top-level character literal. 605 if (const CharacterLiteral *Char = 606 dyn_cast<CharacterLiteral>(ValueExpr->IgnoreParens())) { 607 // In C, character literals have type 'int'. That's not the type we want 608 // to use to determine the Objective-c literal kind. 609 switch (Char->getKind()) { 610 case CharacterLiteral::Ascii: 611 case CharacterLiteral::UTF8: 612 ValueType = Context.CharTy; 613 break; 614 615 case CharacterLiteral::Wide: 616 ValueType = Context.getWideCharType(); 617 break; 618 619 case CharacterLiteral::UTF16: 620 ValueType = Context.Char16Ty; 621 break; 622 623 case CharacterLiteral::UTF32: 624 ValueType = Context.Char32Ty; 625 break; 626 } 627 } 628 // FIXME: Do I need to do anything special with BoolTy expressions? 629 630 // Look for the appropriate method within NSNumber. 631 BoxingMethod = getNSNumberFactoryMethod(*this, Loc, ValueType); 632 BoxedType = NSNumberPointer; 633 } else if (const EnumType *ET = ValueType->getAs<EnumType>()) { 634 if (!ET->getDecl()->isComplete()) { 635 Diag(Loc, diag::err_objc_incomplete_boxed_expression_type) 636 << ValueType << ValueExpr->getSourceRange(); 637 return ExprError(); 638 } 639 640 BoxingMethod = getNSNumberFactoryMethod(*this, Loc, 641 ET->getDecl()->getIntegerType()); 642 BoxedType = NSNumberPointer; 643 } else if (ValueType->isObjCBoxableRecordType()) { 644 // Support for structure types, that marked as objc_boxable 645 // struct __attribute__((objc_boxable)) s { ... }; 646 647 // Look up the NSValue class, if we haven't done so already. It's cached 648 // in the Sema instance. 649 if (!NSValueDecl) { 650 NSValueDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc, 651 Sema::LK_Boxed); 652 if (!NSValueDecl) { 653 return ExprError(); 654 } 655 656 // generate the pointer to NSValue type. 657 QualType NSValueObject = Context.getObjCInterfaceType(NSValueDecl); 658 NSValuePointer = Context.getObjCObjectPointerType(NSValueObject); 659 } 660 661 if (!ValueWithBytesObjCTypeMethod) { 662 IdentifierInfo *II[] = { 663 &Context.Idents.get("valueWithBytes"), 664 &Context.Idents.get("objCType") 665 }; 666 Selector ValueWithBytesObjCType = Context.Selectors.getSelector(2, II); 667 668 // Look for the appropriate method within NSValue. 669 BoxingMethod = NSValueDecl->lookupClassMethod(ValueWithBytesObjCType); 670 if (!BoxingMethod && getLangOpts().DebuggerObjCLiteral) { 671 // Debugger needs to work even if NSValue hasn't been defined. 672 TypeSourceInfo *ReturnTInfo = nullptr; 673 ObjCMethodDecl *M = ObjCMethodDecl::Create( 674 Context, 675 SourceLocation(), 676 SourceLocation(), 677 ValueWithBytesObjCType, 678 NSValuePointer, 679 ReturnTInfo, 680 NSValueDecl, 681 /*isInstance=*/false, 682 /*isVariadic=*/false, 683 /*isPropertyAccessor=*/false, 684 /*isImplicitlyDeclared=*/true, 685 /*isDefined=*/false, 686 ObjCMethodDecl::Required, 687 /*HasRelatedResultType=*/false); 688 689 SmallVector<ParmVarDecl *, 2> Params; 690 691 ParmVarDecl *bytes = 692 ParmVarDecl::Create(Context, M, 693 SourceLocation(), SourceLocation(), 694 &Context.Idents.get("bytes"), 695 Context.VoidPtrTy.withConst(), 696 /*TInfo=*/nullptr, 697 SC_None, nullptr); 698 Params.push_back(bytes); 699 700 QualType ConstCharType = Context.CharTy.withConst(); 701 ParmVarDecl *type = 702 ParmVarDecl::Create(Context, M, 703 SourceLocation(), SourceLocation(), 704 &Context.Idents.get("type"), 705 Context.getPointerType(ConstCharType), 706 /*TInfo=*/nullptr, 707 SC_None, nullptr); 708 Params.push_back(type); 709 710 M->setMethodParams(Context, Params, None); 711 BoxingMethod = M; 712 } 713 714 if (!validateBoxingMethod(*this, Loc, NSValueDecl, 715 ValueWithBytesObjCType, BoxingMethod)) 716 return ExprError(); 717 718 ValueWithBytesObjCTypeMethod = BoxingMethod; 719 } 720 721 if (!ValueType.isTriviallyCopyableType(Context)) { 722 Diag(Loc, diag::err_objc_non_trivially_copyable_boxed_expression_type) 723 << ValueType << ValueExpr->getSourceRange(); 724 return ExprError(); 725 } 726 727 BoxingMethod = ValueWithBytesObjCTypeMethod; 728 BoxedType = NSValuePointer; 729 } 730 731 if (!BoxingMethod) { 732 Diag(Loc, diag::err_objc_illegal_boxed_expression_type) 733 << ValueType << ValueExpr->getSourceRange(); 734 return ExprError(); 735 } 736 737 DiagnoseUseOfDecl(BoxingMethod, Loc); 738 739 ExprResult ConvertedValueExpr; 740 if (ValueType->isObjCBoxableRecordType()) { 741 InitializedEntity IE = InitializedEntity::InitializeTemporary(ValueType); 742 ConvertedValueExpr = PerformCopyInitialization(IE, ValueExpr->getExprLoc(), 743 ValueExpr); 744 } else { 745 // Convert the expression to the type that the parameter requires. 746 ParmVarDecl *ParamDecl = BoxingMethod->parameters()[0]; 747 InitializedEntity IE = InitializedEntity::InitializeParameter(Context, 748 ParamDecl); 749 ConvertedValueExpr = PerformCopyInitialization(IE, SourceLocation(), 750 ValueExpr); 751 } 752 753 if (ConvertedValueExpr.isInvalid()) 754 return ExprError(); 755 ValueExpr = ConvertedValueExpr.get(); 756 757 ObjCBoxedExpr *BoxedExpr = 758 new (Context) ObjCBoxedExpr(ValueExpr, BoxedType, 759 BoxingMethod, SR); 760 return MaybeBindToTemporary(BoxedExpr); 761 } 762 763 /// Build an ObjC subscript pseudo-object expression, given that 764 /// that's supported by the runtime. 765 ExprResult Sema::BuildObjCSubscriptExpression(SourceLocation RB, Expr *BaseExpr, 766 Expr *IndexExpr, 767 ObjCMethodDecl *getterMethod, 768 ObjCMethodDecl *setterMethod) { 769 assert(!LangOpts.isSubscriptPointerArithmetic()); 770 771 // We can't get dependent types here; our callers should have 772 // filtered them out. 773 assert((!BaseExpr->isTypeDependent() && !IndexExpr->isTypeDependent()) && 774 "base or index cannot have dependent type here"); 775 776 // Filter out placeholders in the index. In theory, overloads could 777 // be preserved here, although that might not actually work correctly. 778 ExprResult Result = CheckPlaceholderExpr(IndexExpr); 779 if (Result.isInvalid()) 780 return ExprError(); 781 IndexExpr = Result.get(); 782 783 // Perform lvalue-to-rvalue conversion on the base. 784 Result = DefaultLvalueConversion(BaseExpr); 785 if (Result.isInvalid()) 786 return ExprError(); 787 BaseExpr = Result.get(); 788 789 // Build the pseudo-object expression. 790 return new (Context) ObjCSubscriptRefExpr( 791 BaseExpr, IndexExpr, Context.PseudoObjectTy, VK_LValue, OK_ObjCSubscript, 792 getterMethod, setterMethod, RB); 793 } 794 795 ExprResult Sema::BuildObjCArrayLiteral(SourceRange SR, MultiExprArg Elements) { 796 SourceLocation Loc = SR.getBegin(); 797 798 if (!NSArrayDecl) { 799 NSArrayDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc, 800 Sema::LK_Array); 801 if (!NSArrayDecl) { 802 return ExprError(); 803 } 804 } 805 806 // Find the arrayWithObjects:count: method, if we haven't done so already. 807 QualType IdT = Context.getObjCIdType(); 808 if (!ArrayWithObjectsMethod) { 809 Selector 810 Sel = NSAPIObj->getNSArraySelector(NSAPI::NSArr_arrayWithObjectsCount); 811 ObjCMethodDecl *Method = NSArrayDecl->lookupClassMethod(Sel); 812 if (!Method && getLangOpts().DebuggerObjCLiteral) { 813 TypeSourceInfo *ReturnTInfo = nullptr; 814 Method = ObjCMethodDecl::Create( 815 Context, SourceLocation(), SourceLocation(), Sel, IdT, ReturnTInfo, 816 Context.getTranslationUnitDecl(), false /*Instance*/, 817 false /*isVariadic*/, 818 /*isPropertyAccessor=*/false, 819 /*isImplicitlyDeclared=*/true, /*isDefined=*/false, 820 ObjCMethodDecl::Required, false); 821 SmallVector<ParmVarDecl *, 2> Params; 822 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method, 823 SourceLocation(), 824 SourceLocation(), 825 &Context.Idents.get("objects"), 826 Context.getPointerType(IdT), 827 /*TInfo=*/nullptr, 828 SC_None, nullptr); 829 Params.push_back(objects); 830 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method, 831 SourceLocation(), 832 SourceLocation(), 833 &Context.Idents.get("cnt"), 834 Context.UnsignedLongTy, 835 /*TInfo=*/nullptr, SC_None, 836 nullptr); 837 Params.push_back(cnt); 838 Method->setMethodParams(Context, Params, None); 839 } 840 841 if (!validateBoxingMethod(*this, Loc, NSArrayDecl, Sel, Method)) 842 return ExprError(); 843 844 // Dig out the type that all elements should be converted to. 845 QualType T = Method->parameters()[0]->getType(); 846 const PointerType *PtrT = T->getAs<PointerType>(); 847 if (!PtrT || 848 !Context.hasSameUnqualifiedType(PtrT->getPointeeType(), IdT)) { 849 Diag(SR.getBegin(), diag::err_objc_literal_method_sig) 850 << Sel; 851 Diag(Method->parameters()[0]->getLocation(), 852 diag::note_objc_literal_method_param) 853 << 0 << T 854 << Context.getPointerType(IdT.withConst()); 855 return ExprError(); 856 } 857 858 // Check that the 'count' parameter is integral. 859 if (!Method->parameters()[1]->getType()->isIntegerType()) { 860 Diag(SR.getBegin(), diag::err_objc_literal_method_sig) 861 << Sel; 862 Diag(Method->parameters()[1]->getLocation(), 863 diag::note_objc_literal_method_param) 864 << 1 865 << Method->parameters()[1]->getType() 866 << "integral"; 867 return ExprError(); 868 } 869 870 // We've found a good +arrayWithObjects:count: method. Save it! 871 ArrayWithObjectsMethod = Method; 872 } 873 874 QualType ObjectsType = ArrayWithObjectsMethod->parameters()[0]->getType(); 875 QualType RequiredType = ObjectsType->castAs<PointerType>()->getPointeeType(); 876 877 // Check that each of the elements provided is valid in a collection literal, 878 // performing conversions as necessary. 879 Expr **ElementsBuffer = Elements.data(); 880 for (unsigned I = 0, N = Elements.size(); I != N; ++I) { 881 ExprResult Converted = CheckObjCCollectionLiteralElement(*this, 882 ElementsBuffer[I], 883 RequiredType, true); 884 if (Converted.isInvalid()) 885 return ExprError(); 886 887 ElementsBuffer[I] = Converted.get(); 888 } 889 890 QualType Ty 891 = Context.getObjCObjectPointerType( 892 Context.getObjCInterfaceType(NSArrayDecl)); 893 894 return MaybeBindToTemporary( 895 ObjCArrayLiteral::Create(Context, Elements, Ty, 896 ArrayWithObjectsMethod, SR)); 897 } 898 899 ExprResult Sema::BuildObjCDictionaryLiteral(SourceRange SR, 900 MutableArrayRef<ObjCDictionaryElement> Elements) { 901 SourceLocation Loc = SR.getBegin(); 902 903 if (!NSDictionaryDecl) { 904 NSDictionaryDecl = LookupObjCInterfaceDeclForLiteral(*this, Loc, 905 Sema::LK_Dictionary); 906 if (!NSDictionaryDecl) { 907 return ExprError(); 908 } 909 } 910 911 // Find the dictionaryWithObjects:forKeys:count: method, if we haven't done 912 // so already. 913 QualType IdT = Context.getObjCIdType(); 914 if (!DictionaryWithObjectsMethod) { 915 Selector Sel = NSAPIObj->getNSDictionarySelector( 916 NSAPI::NSDict_dictionaryWithObjectsForKeysCount); 917 ObjCMethodDecl *Method = NSDictionaryDecl->lookupClassMethod(Sel); 918 if (!Method && getLangOpts().DebuggerObjCLiteral) { 919 Method = ObjCMethodDecl::Create(Context, 920 SourceLocation(), SourceLocation(), Sel, 921 IdT, 922 nullptr /*TypeSourceInfo */, 923 Context.getTranslationUnitDecl(), 924 false /*Instance*/, false/*isVariadic*/, 925 /*isPropertyAccessor=*/false, 926 /*isImplicitlyDeclared=*/true, /*isDefined=*/false, 927 ObjCMethodDecl::Required, 928 false); 929 SmallVector<ParmVarDecl *, 3> Params; 930 ParmVarDecl *objects = ParmVarDecl::Create(Context, Method, 931 SourceLocation(), 932 SourceLocation(), 933 &Context.Idents.get("objects"), 934 Context.getPointerType(IdT), 935 /*TInfo=*/nullptr, SC_None, 936 nullptr); 937 Params.push_back(objects); 938 ParmVarDecl *keys = ParmVarDecl::Create(Context, Method, 939 SourceLocation(), 940 SourceLocation(), 941 &Context.Idents.get("keys"), 942 Context.getPointerType(IdT), 943 /*TInfo=*/nullptr, SC_None, 944 nullptr); 945 Params.push_back(keys); 946 ParmVarDecl *cnt = ParmVarDecl::Create(Context, Method, 947 SourceLocation(), 948 SourceLocation(), 949 &Context.Idents.get("cnt"), 950 Context.UnsignedLongTy, 951 /*TInfo=*/nullptr, SC_None, 952 nullptr); 953 Params.push_back(cnt); 954 Method->setMethodParams(Context, Params, None); 955 } 956 957 if (!validateBoxingMethod(*this, SR.getBegin(), NSDictionaryDecl, Sel, 958 Method)) 959 return ExprError(); 960 961 // Dig out the type that all values should be converted to. 962 QualType ValueT = Method->parameters()[0]->getType(); 963 const PointerType *PtrValue = ValueT->getAs<PointerType>(); 964 if (!PtrValue || 965 !Context.hasSameUnqualifiedType(PtrValue->getPointeeType(), IdT)) { 966 Diag(SR.getBegin(), diag::err_objc_literal_method_sig) 967 << Sel; 968 Diag(Method->parameters()[0]->getLocation(), 969 diag::note_objc_literal_method_param) 970 << 0 << ValueT 971 << Context.getPointerType(IdT.withConst()); 972 return ExprError(); 973 } 974 975 // Dig out the type that all keys should be converted to. 976 QualType KeyT = Method->parameters()[1]->getType(); 977 const PointerType *PtrKey = KeyT->getAs<PointerType>(); 978 if (!PtrKey || 979 !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(), 980 IdT)) { 981 bool err = true; 982 if (PtrKey) { 983 if (QIDNSCopying.isNull()) { 984 // key argument of selector is id<NSCopying>? 985 if (ObjCProtocolDecl *NSCopyingPDecl = 986 LookupProtocol(&Context.Idents.get("NSCopying"), SR.getBegin())) { 987 ObjCProtocolDecl *PQ[] = {NSCopyingPDecl}; 988 QIDNSCopying = 989 Context.getObjCObjectType(Context.ObjCBuiltinIdTy, { }, 990 llvm::makeArrayRef( 991 (ObjCProtocolDecl**) PQ, 992 1), 993 false); 994 QIDNSCopying = Context.getObjCObjectPointerType(QIDNSCopying); 995 } 996 } 997 if (!QIDNSCopying.isNull()) 998 err = !Context.hasSameUnqualifiedType(PtrKey->getPointeeType(), 999 QIDNSCopying); 1000 } 1001 1002 if (err) { 1003 Diag(SR.getBegin(), diag::err_objc_literal_method_sig) 1004 << Sel; 1005 Diag(Method->parameters()[1]->getLocation(), 1006 diag::note_objc_literal_method_param) 1007 << 1 << KeyT 1008 << Context.getPointerType(IdT.withConst()); 1009 return ExprError(); 1010 } 1011 } 1012 1013 // Check that the 'count' parameter is integral. 1014 QualType CountType = Method->parameters()[2]->getType(); 1015 if (!CountType->isIntegerType()) { 1016 Diag(SR.getBegin(), diag::err_objc_literal_method_sig) 1017 << Sel; 1018 Diag(Method->parameters()[2]->getLocation(), 1019 diag::note_objc_literal_method_param) 1020 << 2 << CountType 1021 << "integral"; 1022 return ExprError(); 1023 } 1024 1025 // We've found a good +dictionaryWithObjects:keys:count: method; save it! 1026 DictionaryWithObjectsMethod = Method; 1027 } 1028 1029 QualType ValuesT = DictionaryWithObjectsMethod->parameters()[0]->getType(); 1030 QualType ValueT = ValuesT->castAs<PointerType>()->getPointeeType(); 1031 QualType KeysT = DictionaryWithObjectsMethod->parameters()[1]->getType(); 1032 QualType KeyT = KeysT->castAs<PointerType>()->getPointeeType(); 1033 1034 // Check that each of the keys and values provided is valid in a collection 1035 // literal, performing conversions as necessary. 1036 bool HasPackExpansions = false; 1037 for (ObjCDictionaryElement &Element : Elements) { 1038 // Check the key. 1039 ExprResult Key = CheckObjCCollectionLiteralElement(*this, Element.Key, 1040 KeyT); 1041 if (Key.isInvalid()) 1042 return ExprError(); 1043 1044 // Check the value. 1045 ExprResult Value 1046 = CheckObjCCollectionLiteralElement(*this, Element.Value, ValueT); 1047 if (Value.isInvalid()) 1048 return ExprError(); 1049 1050 Element.Key = Key.get(); 1051 Element.Value = Value.get(); 1052 1053 if (Element.EllipsisLoc.isInvalid()) 1054 continue; 1055 1056 if (!Element.Key->containsUnexpandedParameterPack() && 1057 !Element.Value->containsUnexpandedParameterPack()) { 1058 Diag(Element.EllipsisLoc, 1059 diag::err_pack_expansion_without_parameter_packs) 1060 << SourceRange(Element.Key->getBeginLoc(), 1061 Element.Value->getEndLoc()); 1062 return ExprError(); 1063 } 1064 1065 HasPackExpansions = true; 1066 } 1067 1068 QualType Ty 1069 = Context.getObjCObjectPointerType( 1070 Context.getObjCInterfaceType(NSDictionaryDecl)); 1071 return MaybeBindToTemporary(ObjCDictionaryLiteral::Create( 1072 Context, Elements, HasPackExpansions, Ty, 1073 DictionaryWithObjectsMethod, SR)); 1074 } 1075 1076 ExprResult Sema::BuildObjCEncodeExpression(SourceLocation AtLoc, 1077 TypeSourceInfo *EncodedTypeInfo, 1078 SourceLocation RParenLoc) { 1079 QualType EncodedType = EncodedTypeInfo->getType(); 1080 QualType StrTy; 1081 if (EncodedType->isDependentType()) 1082 StrTy = Context.DependentTy; 1083 else { 1084 if (!EncodedType->getAsArrayTypeUnsafe() && //// Incomplete array is handled. 1085 !EncodedType->isVoidType()) // void is handled too. 1086 if (RequireCompleteType(AtLoc, EncodedType, 1087 diag::err_incomplete_type_objc_at_encode, 1088 EncodedTypeInfo->getTypeLoc())) 1089 return ExprError(); 1090 1091 std::string Str; 1092 QualType NotEncodedT; 1093 Context.getObjCEncodingForType(EncodedType, Str, nullptr, &NotEncodedT); 1094 if (!NotEncodedT.isNull()) 1095 Diag(AtLoc, diag::warn_incomplete_encoded_type) 1096 << EncodedType << NotEncodedT; 1097 1098 // The type of @encode is the same as the type of the corresponding string, 1099 // which is an array type. 1100 StrTy = Context.CharTy; 1101 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 1102 if (getLangOpts().CPlusPlus || getLangOpts().ConstStrings) 1103 StrTy.addConst(); 1104 StrTy = Context.getConstantArrayType(StrTy, llvm::APInt(32, Str.size()+1), 1105 ArrayType::Normal, 0); 1106 } 1107 1108 return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc); 1109 } 1110 1111 ExprResult Sema::ParseObjCEncodeExpression(SourceLocation AtLoc, 1112 SourceLocation EncodeLoc, 1113 SourceLocation LParenLoc, 1114 ParsedType ty, 1115 SourceLocation RParenLoc) { 1116 // FIXME: Preserve type source info ? 1117 TypeSourceInfo *TInfo; 1118 QualType EncodedType = GetTypeFromParser(ty, &TInfo); 1119 if (!TInfo) 1120 TInfo = Context.getTrivialTypeSourceInfo(EncodedType, 1121 getLocForEndOfToken(LParenLoc)); 1122 1123 return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc); 1124 } 1125 1126 static bool HelperToDiagnoseMismatchedMethodsInGlobalPool(Sema &S, 1127 SourceLocation AtLoc, 1128 SourceLocation LParenLoc, 1129 SourceLocation RParenLoc, 1130 ObjCMethodDecl *Method, 1131 ObjCMethodList &MethList) { 1132 ObjCMethodList *M = &MethList; 1133 bool Warned = false; 1134 for (M = M->getNext(); M; M=M->getNext()) { 1135 ObjCMethodDecl *MatchingMethodDecl = M->getMethod(); 1136 if (MatchingMethodDecl == Method || 1137 isa<ObjCImplDecl>(MatchingMethodDecl->getDeclContext()) || 1138 MatchingMethodDecl->getSelector() != Method->getSelector()) 1139 continue; 1140 if (!S.MatchTwoMethodDeclarations(Method, 1141 MatchingMethodDecl, Sema::MMS_loose)) { 1142 if (!Warned) { 1143 Warned = true; 1144 S.Diag(AtLoc, diag::warn_multiple_selectors) 1145 << Method->getSelector() << FixItHint::CreateInsertion(LParenLoc, "(") 1146 << FixItHint::CreateInsertion(RParenLoc, ")"); 1147 S.Diag(Method->getLocation(), diag::note_method_declared_at) 1148 << Method->getDeclName(); 1149 } 1150 S.Diag(MatchingMethodDecl->getLocation(), diag::note_method_declared_at) 1151 << MatchingMethodDecl->getDeclName(); 1152 } 1153 } 1154 return Warned; 1155 } 1156 1157 static void DiagnoseMismatchedSelectors(Sema &S, SourceLocation AtLoc, 1158 ObjCMethodDecl *Method, 1159 SourceLocation LParenLoc, 1160 SourceLocation RParenLoc, 1161 bool WarnMultipleSelectors) { 1162 if (!WarnMultipleSelectors || 1163 S.Diags.isIgnored(diag::warn_multiple_selectors, SourceLocation())) 1164 return; 1165 bool Warned = false; 1166 for (Sema::GlobalMethodPool::iterator b = S.MethodPool.begin(), 1167 e = S.MethodPool.end(); b != e; b++) { 1168 // first, instance methods 1169 ObjCMethodList &InstMethList = b->second.first; 1170 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc, 1171 Method, InstMethList)) 1172 Warned = true; 1173 1174 // second, class methods 1175 ObjCMethodList &ClsMethList = b->second.second; 1176 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc, 1177 Method, ClsMethList) || Warned) 1178 return; 1179 } 1180 } 1181 1182 ExprResult Sema::ParseObjCSelectorExpression(Selector Sel, 1183 SourceLocation AtLoc, 1184 SourceLocation SelLoc, 1185 SourceLocation LParenLoc, 1186 SourceLocation RParenLoc, 1187 bool WarnMultipleSelectors) { 1188 ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel, 1189 SourceRange(LParenLoc, RParenLoc)); 1190 if (!Method) 1191 Method = LookupFactoryMethodInGlobalPool(Sel, 1192 SourceRange(LParenLoc, RParenLoc)); 1193 if (!Method) { 1194 if (const ObjCMethodDecl *OM = SelectorsForTypoCorrection(Sel)) { 1195 Selector MatchedSel = OM->getSelector(); 1196 SourceRange SelectorRange(LParenLoc.getLocWithOffset(1), 1197 RParenLoc.getLocWithOffset(-1)); 1198 Diag(SelLoc, diag::warn_undeclared_selector_with_typo) 1199 << Sel << MatchedSel 1200 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString()); 1201 1202 } else 1203 Diag(SelLoc, diag::warn_undeclared_selector) << Sel; 1204 } else 1205 DiagnoseMismatchedSelectors(*this, AtLoc, Method, LParenLoc, RParenLoc, 1206 WarnMultipleSelectors); 1207 1208 if (Method && 1209 Method->getImplementationControl() != ObjCMethodDecl::Optional && 1210 !getSourceManager().isInSystemHeader(Method->getLocation())) 1211 ReferencedSelectors.insert(std::make_pair(Sel, AtLoc)); 1212 1213 // In ARC, forbid the user from using @selector for 1214 // retain/release/autorelease/dealloc/retainCount. 1215 if (getLangOpts().ObjCAutoRefCount) { 1216 switch (Sel.getMethodFamily()) { 1217 case OMF_retain: 1218 case OMF_release: 1219 case OMF_autorelease: 1220 case OMF_retainCount: 1221 case OMF_dealloc: 1222 Diag(AtLoc, diag::err_arc_illegal_selector) << 1223 Sel << SourceRange(LParenLoc, RParenLoc); 1224 break; 1225 1226 case OMF_None: 1227 case OMF_alloc: 1228 case OMF_copy: 1229 case OMF_finalize: 1230 case OMF_init: 1231 case OMF_mutableCopy: 1232 case OMF_new: 1233 case OMF_self: 1234 case OMF_initialize: 1235 case OMF_performSelector: 1236 break; 1237 } 1238 } 1239 QualType Ty = Context.getObjCSelType(); 1240 return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc); 1241 } 1242 1243 ExprResult Sema::ParseObjCProtocolExpression(IdentifierInfo *ProtocolId, 1244 SourceLocation AtLoc, 1245 SourceLocation ProtoLoc, 1246 SourceLocation LParenLoc, 1247 SourceLocation ProtoIdLoc, 1248 SourceLocation RParenLoc) { 1249 ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoIdLoc); 1250 if (!PDecl) { 1251 Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId; 1252 return true; 1253 } 1254 if (!PDecl->hasDefinition()) { 1255 Diag(ProtoLoc, diag::err_atprotocol_protocol) << PDecl; 1256 Diag(PDecl->getLocation(), diag::note_entity_declared_at) << PDecl; 1257 } else { 1258 PDecl = PDecl->getDefinition(); 1259 } 1260 1261 QualType Ty = Context.getObjCProtoType(); 1262 if (Ty.isNull()) 1263 return true; 1264 Ty = Context.getObjCObjectPointerType(Ty); 1265 return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, ProtoIdLoc, RParenLoc); 1266 } 1267 1268 /// Try to capture an implicit reference to 'self'. 1269 ObjCMethodDecl *Sema::tryCaptureObjCSelf(SourceLocation Loc) { 1270 DeclContext *DC = getFunctionLevelDeclContext(); 1271 1272 // If we're not in an ObjC method, error out. Note that, unlike the 1273 // C++ case, we don't require an instance method --- class methods 1274 // still have a 'self', and we really do still need to capture it! 1275 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(DC); 1276 if (!method) 1277 return nullptr; 1278 1279 tryCaptureVariable(method->getSelfDecl(), Loc); 1280 1281 return method; 1282 } 1283 1284 static QualType stripObjCInstanceType(ASTContext &Context, QualType T) { 1285 QualType origType = T; 1286 if (auto nullability = AttributedType::stripOuterNullability(T)) { 1287 if (T == Context.getObjCInstanceType()) { 1288 return Context.getAttributedType( 1289 AttributedType::getNullabilityAttrKind(*nullability), 1290 Context.getObjCIdType(), 1291 Context.getObjCIdType()); 1292 } 1293 1294 return origType; 1295 } 1296 1297 if (T == Context.getObjCInstanceType()) 1298 return Context.getObjCIdType(); 1299 1300 return origType; 1301 } 1302 1303 /// Determine the result type of a message send based on the receiver type, 1304 /// method, and the kind of message send. 1305 /// 1306 /// This is the "base" result type, which will still need to be adjusted 1307 /// to account for nullability. 1308 static QualType getBaseMessageSendResultType(Sema &S, 1309 QualType ReceiverType, 1310 ObjCMethodDecl *Method, 1311 bool isClassMessage, 1312 bool isSuperMessage) { 1313 assert(Method && "Must have a method"); 1314 if (!Method->hasRelatedResultType()) 1315 return Method->getSendResultType(ReceiverType); 1316 1317 ASTContext &Context = S.Context; 1318 1319 // Local function that transfers the nullability of the method's 1320 // result type to the returned result. 1321 auto transferNullability = [&](QualType type) -> QualType { 1322 // If the method's result type has nullability, extract it. 1323 if (auto nullability = Method->getSendResultType(ReceiverType) 1324 ->getNullability(Context)){ 1325 // Strip off any outer nullability sugar from the provided type. 1326 (void)AttributedType::stripOuterNullability(type); 1327 1328 // Form a new attributed type using the method result type's nullability. 1329 return Context.getAttributedType( 1330 AttributedType::getNullabilityAttrKind(*nullability), 1331 type, 1332 type); 1333 } 1334 1335 return type; 1336 }; 1337 1338 // If a method has a related return type: 1339 // - if the method found is an instance method, but the message send 1340 // was a class message send, T is the declared return type of the method 1341 // found 1342 if (Method->isInstanceMethod() && isClassMessage) 1343 return stripObjCInstanceType(Context, 1344 Method->getSendResultType(ReceiverType)); 1345 1346 // - if the receiver is super, T is a pointer to the class of the 1347 // enclosing method definition 1348 if (isSuperMessage) { 1349 if (ObjCMethodDecl *CurMethod = S.getCurMethodDecl()) 1350 if (ObjCInterfaceDecl *Class = CurMethod->getClassInterface()) { 1351 return transferNullability( 1352 Context.getObjCObjectPointerType( 1353 Context.getObjCInterfaceType(Class))); 1354 } 1355 } 1356 1357 // - if the receiver is the name of a class U, T is a pointer to U 1358 if (ReceiverType->getAsObjCInterfaceType()) 1359 return transferNullability(Context.getObjCObjectPointerType(ReceiverType)); 1360 // - if the receiver is of type Class or qualified Class type, 1361 // T is the declared return type of the method. 1362 if (ReceiverType->isObjCClassType() || 1363 ReceiverType->isObjCQualifiedClassType()) 1364 return stripObjCInstanceType(Context, 1365 Method->getSendResultType(ReceiverType)); 1366 1367 // - if the receiver is id, qualified id, Class, or qualified Class, T 1368 // is the receiver type, otherwise 1369 // - T is the type of the receiver expression. 1370 return transferNullability(ReceiverType); 1371 } 1372 1373 QualType Sema::getMessageSendResultType(const Expr *Receiver, 1374 QualType ReceiverType, 1375 ObjCMethodDecl *Method, 1376 bool isClassMessage, 1377 bool isSuperMessage) { 1378 // Produce the result type. 1379 QualType resultType = getBaseMessageSendResultType(*this, ReceiverType, 1380 Method, 1381 isClassMessage, 1382 isSuperMessage); 1383 1384 // If this is a class message, ignore the nullability of the receiver. 1385 if (isClassMessage) { 1386 // In a class method, class messages to 'self' that return instancetype can 1387 // be typed as the current class. We can safely do this in ARC because self 1388 // can't be reassigned, and we do it unsafely outside of ARC because in 1389 // practice people never reassign self in class methods and there's some 1390 // virtue in not being aggressively pedantic. 1391 if (Receiver && Receiver->isObjCSelfExpr()) { 1392 assert(ReceiverType->isObjCClassType() && "expected a Class self"); 1393 QualType T = Method->getSendResultType(ReceiverType); 1394 AttributedType::stripOuterNullability(T); 1395 if (T == Context.getObjCInstanceType()) { 1396 const ObjCMethodDecl *MD = cast<ObjCMethodDecl>( 1397 cast<ImplicitParamDecl>( 1398 cast<DeclRefExpr>(Receiver->IgnoreParenImpCasts())->getDecl()) 1399 ->getDeclContext()); 1400 assert(MD->isClassMethod() && "expected a class method"); 1401 QualType NewResultType = Context.getObjCObjectPointerType( 1402 Context.getObjCInterfaceType(MD->getClassInterface())); 1403 if (auto Nullability = resultType->getNullability(Context)) 1404 NewResultType = Context.getAttributedType( 1405 AttributedType::getNullabilityAttrKind(*Nullability), 1406 NewResultType, NewResultType); 1407 return NewResultType; 1408 } 1409 } 1410 return resultType; 1411 } 1412 1413 // There is nothing left to do if the result type cannot have a nullability 1414 // specifier. 1415 if (!resultType->canHaveNullability()) 1416 return resultType; 1417 1418 // Map the nullability of the result into a table index. 1419 unsigned receiverNullabilityIdx = 0; 1420 if (auto nullability = ReceiverType->getNullability(Context)) 1421 receiverNullabilityIdx = 1 + static_cast<unsigned>(*nullability); 1422 1423 unsigned resultNullabilityIdx = 0; 1424 if (auto nullability = resultType->getNullability(Context)) 1425 resultNullabilityIdx = 1 + static_cast<unsigned>(*nullability); 1426 1427 // The table of nullability mappings, indexed by the receiver's nullability 1428 // and then the result type's nullability. 1429 static const uint8_t None = 0; 1430 static const uint8_t NonNull = 1; 1431 static const uint8_t Nullable = 2; 1432 static const uint8_t Unspecified = 3; 1433 static const uint8_t nullabilityMap[4][4] = { 1434 // None NonNull Nullable Unspecified 1435 /* None */ { None, None, Nullable, None }, 1436 /* NonNull */ { None, NonNull, Nullable, Unspecified }, 1437 /* Nullable */ { Nullable, Nullable, Nullable, Nullable }, 1438 /* Unspecified */ { None, Unspecified, Nullable, Unspecified } 1439 }; 1440 1441 unsigned newResultNullabilityIdx 1442 = nullabilityMap[receiverNullabilityIdx][resultNullabilityIdx]; 1443 if (newResultNullabilityIdx == resultNullabilityIdx) 1444 return resultType; 1445 1446 // Strip off the existing nullability. This removes as little type sugar as 1447 // possible. 1448 do { 1449 if (auto attributed = dyn_cast<AttributedType>(resultType.getTypePtr())) { 1450 resultType = attributed->getModifiedType(); 1451 } else { 1452 resultType = resultType.getDesugaredType(Context); 1453 } 1454 } while (resultType->getNullability(Context)); 1455 1456 // Add nullability back if needed. 1457 if (newResultNullabilityIdx > 0) { 1458 auto newNullability 1459 = static_cast<NullabilityKind>(newResultNullabilityIdx-1); 1460 return Context.getAttributedType( 1461 AttributedType::getNullabilityAttrKind(newNullability), 1462 resultType, resultType); 1463 } 1464 1465 return resultType; 1466 } 1467 1468 /// Look for an ObjC method whose result type exactly matches the given type. 1469 static const ObjCMethodDecl * 1470 findExplicitInstancetypeDeclarer(const ObjCMethodDecl *MD, 1471 QualType instancetype) { 1472 if (MD->getReturnType() == instancetype) 1473 return MD; 1474 1475 // For these purposes, a method in an @implementation overrides a 1476 // declaration in the @interface. 1477 if (const ObjCImplDecl *impl = 1478 dyn_cast<ObjCImplDecl>(MD->getDeclContext())) { 1479 const ObjCContainerDecl *iface; 1480 if (const ObjCCategoryImplDecl *catImpl = 1481 dyn_cast<ObjCCategoryImplDecl>(impl)) { 1482 iface = catImpl->getCategoryDecl(); 1483 } else { 1484 iface = impl->getClassInterface(); 1485 } 1486 1487 const ObjCMethodDecl *ifaceMD = 1488 iface->getMethod(MD->getSelector(), MD->isInstanceMethod()); 1489 if (ifaceMD) return findExplicitInstancetypeDeclarer(ifaceMD, instancetype); 1490 } 1491 1492 SmallVector<const ObjCMethodDecl *, 4> overrides; 1493 MD->getOverriddenMethods(overrides); 1494 for (unsigned i = 0, e = overrides.size(); i != e; ++i) { 1495 if (const ObjCMethodDecl *result = 1496 findExplicitInstancetypeDeclarer(overrides[i], instancetype)) 1497 return result; 1498 } 1499 1500 return nullptr; 1501 } 1502 1503 void Sema::EmitRelatedResultTypeNoteForReturn(QualType destType) { 1504 // Only complain if we're in an ObjC method and the required return 1505 // type doesn't match the method's declared return type. 1506 ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurContext); 1507 if (!MD || !MD->hasRelatedResultType() || 1508 Context.hasSameUnqualifiedType(destType, MD->getReturnType())) 1509 return; 1510 1511 // Look for a method overridden by this method which explicitly uses 1512 // 'instancetype'. 1513 if (const ObjCMethodDecl *overridden = 1514 findExplicitInstancetypeDeclarer(MD, Context.getObjCInstanceType())) { 1515 SourceRange range = overridden->getReturnTypeSourceRange(); 1516 SourceLocation loc = range.getBegin(); 1517 if (loc.isInvalid()) 1518 loc = overridden->getLocation(); 1519 Diag(loc, diag::note_related_result_type_explicit) 1520 << /*current method*/ 1 << range; 1521 return; 1522 } 1523 1524 // Otherwise, if we have an interesting method family, note that. 1525 // This should always trigger if the above didn't. 1526 if (ObjCMethodFamily family = MD->getMethodFamily()) 1527 Diag(MD->getLocation(), diag::note_related_result_type_family) 1528 << /*current method*/ 1 1529 << family; 1530 } 1531 1532 void Sema::EmitRelatedResultTypeNote(const Expr *E) { 1533 E = E->IgnoreParenImpCasts(); 1534 const ObjCMessageExpr *MsgSend = dyn_cast<ObjCMessageExpr>(E); 1535 if (!MsgSend) 1536 return; 1537 1538 const ObjCMethodDecl *Method = MsgSend->getMethodDecl(); 1539 if (!Method) 1540 return; 1541 1542 if (!Method->hasRelatedResultType()) 1543 return; 1544 1545 if (Context.hasSameUnqualifiedType( 1546 Method->getReturnType().getNonReferenceType(), MsgSend->getType())) 1547 return; 1548 1549 if (!Context.hasSameUnqualifiedType(Method->getReturnType(), 1550 Context.getObjCInstanceType())) 1551 return; 1552 1553 Diag(Method->getLocation(), diag::note_related_result_type_inferred) 1554 << Method->isInstanceMethod() << Method->getSelector() 1555 << MsgSend->getType(); 1556 } 1557 1558 bool Sema::CheckMessageArgumentTypes( 1559 const Expr *Receiver, QualType ReceiverType, MultiExprArg Args, 1560 Selector Sel, ArrayRef<SourceLocation> SelectorLocs, ObjCMethodDecl *Method, 1561 bool isClassMessage, bool isSuperMessage, SourceLocation lbrac, 1562 SourceLocation rbrac, SourceRange RecRange, QualType &ReturnType, 1563 ExprValueKind &VK) { 1564 SourceLocation SelLoc; 1565 if (!SelectorLocs.empty() && SelectorLocs.front().isValid()) 1566 SelLoc = SelectorLocs.front(); 1567 else 1568 SelLoc = lbrac; 1569 1570 if (!Method) { 1571 // Apply default argument promotion as for (C99 6.5.2.2p6). 1572 for (unsigned i = 0, e = Args.size(); i != e; i++) { 1573 if (Args[i]->isTypeDependent()) 1574 continue; 1575 1576 ExprResult result; 1577 if (getLangOpts().DebuggerSupport) { 1578 QualType paramTy; // ignored 1579 result = checkUnknownAnyArg(SelLoc, Args[i], paramTy); 1580 } else { 1581 result = DefaultArgumentPromotion(Args[i]); 1582 } 1583 if (result.isInvalid()) 1584 return true; 1585 Args[i] = result.get(); 1586 } 1587 1588 unsigned DiagID; 1589 if (getLangOpts().ObjCAutoRefCount) 1590 DiagID = diag::err_arc_method_not_found; 1591 else 1592 DiagID = isClassMessage ? diag::warn_class_method_not_found 1593 : diag::warn_inst_method_not_found; 1594 if (!getLangOpts().DebuggerSupport) { 1595 const ObjCMethodDecl *OMD = SelectorsForTypoCorrection(Sel, ReceiverType); 1596 if (OMD && !OMD->isInvalidDecl()) { 1597 if (getLangOpts().ObjCAutoRefCount) 1598 DiagID = diag::err_method_not_found_with_typo; 1599 else 1600 DiagID = isClassMessage ? diag::warn_class_method_not_found_with_typo 1601 : diag::warn_instance_method_not_found_with_typo; 1602 Selector MatchedSel = OMD->getSelector(); 1603 SourceRange SelectorRange(SelectorLocs.front(), SelectorLocs.back()); 1604 if (MatchedSel.isUnarySelector()) 1605 Diag(SelLoc, DiagID) 1606 << Sel<< isClassMessage << MatchedSel 1607 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString()); 1608 else 1609 Diag(SelLoc, DiagID) << Sel<< isClassMessage << MatchedSel; 1610 } 1611 else 1612 Diag(SelLoc, DiagID) 1613 << Sel << isClassMessage << SourceRange(SelectorLocs.front(), 1614 SelectorLocs.back()); 1615 // Find the class to which we are sending this message. 1616 if (ReceiverType->isObjCObjectPointerType()) { 1617 if (ObjCInterfaceDecl *ThisClass = 1618 ReceiverType->getAs<ObjCObjectPointerType>()->getInterfaceDecl()) { 1619 Diag(ThisClass->getLocation(), diag::note_receiver_class_declared); 1620 if (!RecRange.isInvalid()) 1621 if (ThisClass->lookupClassMethod(Sel)) 1622 Diag(RecRange.getBegin(),diag::note_receiver_expr_here) 1623 << FixItHint::CreateReplacement(RecRange, 1624 ThisClass->getNameAsString()); 1625 } 1626 } 1627 } 1628 1629 // In debuggers, we want to use __unknown_anytype for these 1630 // results so that clients can cast them. 1631 if (getLangOpts().DebuggerSupport) { 1632 ReturnType = Context.UnknownAnyTy; 1633 } else { 1634 ReturnType = Context.getObjCIdType(); 1635 } 1636 VK = VK_RValue; 1637 return false; 1638 } 1639 1640 ReturnType = getMessageSendResultType(Receiver, ReceiverType, Method, 1641 isClassMessage, isSuperMessage); 1642 VK = Expr::getValueKindForType(Method->getReturnType()); 1643 1644 unsigned NumNamedArgs = Sel.getNumArgs(); 1645 // Method might have more arguments than selector indicates. This is due 1646 // to addition of c-style arguments in method. 1647 if (Method->param_size() > Sel.getNumArgs()) 1648 NumNamedArgs = Method->param_size(); 1649 // FIXME. This need be cleaned up. 1650 if (Args.size() < NumNamedArgs) { 1651 Diag(SelLoc, diag::err_typecheck_call_too_few_args) 1652 << 2 << NumNamedArgs << static_cast<unsigned>(Args.size()); 1653 return false; 1654 } 1655 1656 // Compute the set of type arguments to be substituted into each parameter 1657 // type. 1658 Optional<ArrayRef<QualType>> typeArgs 1659 = ReceiverType->getObjCSubstitutions(Method->getDeclContext()); 1660 bool IsError = false; 1661 for (unsigned i = 0; i < NumNamedArgs; i++) { 1662 // We can't do any type-checking on a type-dependent argument. 1663 if (Args[i]->isTypeDependent()) 1664 continue; 1665 1666 Expr *argExpr = Args[i]; 1667 1668 ParmVarDecl *param = Method->parameters()[i]; 1669 assert(argExpr && "CheckMessageArgumentTypes(): missing expression"); 1670 1671 if (param->hasAttr<NoEscapeAttr>()) 1672 if (auto *BE = dyn_cast<BlockExpr>( 1673 argExpr->IgnoreParenNoopCasts(Context))) 1674 BE->getBlockDecl()->setDoesNotEscape(); 1675 1676 // Strip the unbridged-cast placeholder expression off unless it's 1677 // a consumed argument. 1678 if (argExpr->hasPlaceholderType(BuiltinType::ARCUnbridgedCast) && 1679 !param->hasAttr<CFConsumedAttr>()) 1680 argExpr = stripARCUnbridgedCast(argExpr); 1681 1682 // If the parameter is __unknown_anytype, infer its type 1683 // from the argument. 1684 if (param->getType() == Context.UnknownAnyTy) { 1685 QualType paramType; 1686 ExprResult argE = checkUnknownAnyArg(SelLoc, argExpr, paramType); 1687 if (argE.isInvalid()) { 1688 IsError = true; 1689 } else { 1690 Args[i] = argE.get(); 1691 1692 // Update the parameter type in-place. 1693 param->setType(paramType); 1694 } 1695 continue; 1696 } 1697 1698 QualType origParamType = param->getType(); 1699 QualType paramType = param->getType(); 1700 if (typeArgs) 1701 paramType = paramType.substObjCTypeArgs( 1702 Context, 1703 *typeArgs, 1704 ObjCSubstitutionContext::Parameter); 1705 1706 if (RequireCompleteType(argExpr->getSourceRange().getBegin(), 1707 paramType, 1708 diag::err_call_incomplete_argument, argExpr)) 1709 return true; 1710 1711 InitializedEntity Entity 1712 = InitializedEntity::InitializeParameter(Context, param, paramType); 1713 ExprResult ArgE = PerformCopyInitialization(Entity, SourceLocation(), argExpr); 1714 if (ArgE.isInvalid()) 1715 IsError = true; 1716 else { 1717 Args[i] = ArgE.getAs<Expr>(); 1718 1719 // If we are type-erasing a block to a block-compatible 1720 // Objective-C pointer type, we may need to extend the lifetime 1721 // of the block object. 1722 if (typeArgs && Args[i]->isRValue() && paramType->isBlockPointerType() && 1723 Args[i]->getType()->isBlockPointerType() && 1724 origParamType->isObjCObjectPointerType()) { 1725 ExprResult arg = Args[i]; 1726 maybeExtendBlockObject(arg); 1727 Args[i] = arg.get(); 1728 } 1729 } 1730 } 1731 1732 // Promote additional arguments to variadic methods. 1733 if (Method->isVariadic()) { 1734 for (unsigned i = NumNamedArgs, e = Args.size(); i < e; ++i) { 1735 if (Args[i]->isTypeDependent()) 1736 continue; 1737 1738 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod, 1739 nullptr); 1740 IsError |= Arg.isInvalid(); 1741 Args[i] = Arg.get(); 1742 } 1743 } else { 1744 // Check for extra arguments to non-variadic methods. 1745 if (Args.size() != NumNamedArgs) { 1746 Diag(Args[NumNamedArgs]->getBeginLoc(), 1747 diag::err_typecheck_call_too_many_args) 1748 << 2 /*method*/ << NumNamedArgs << static_cast<unsigned>(Args.size()) 1749 << Method->getSourceRange() 1750 << SourceRange(Args[NumNamedArgs]->getBeginLoc(), 1751 Args.back()->getEndLoc()); 1752 } 1753 } 1754 1755 DiagnoseSentinelCalls(Method, SelLoc, Args); 1756 1757 // Do additional checkings on method. 1758 IsError |= CheckObjCMethodCall( 1759 Method, SelLoc, makeArrayRef(Args.data(), Args.size())); 1760 1761 return IsError; 1762 } 1763 1764 bool Sema::isSelfExpr(Expr *RExpr) { 1765 // 'self' is objc 'self' in an objc method only. 1766 ObjCMethodDecl *Method = 1767 dyn_cast_or_null<ObjCMethodDecl>(CurContext->getNonClosureAncestor()); 1768 return isSelfExpr(RExpr, Method); 1769 } 1770 1771 bool Sema::isSelfExpr(Expr *receiver, const ObjCMethodDecl *method) { 1772 if (!method) return false; 1773 1774 receiver = receiver->IgnoreParenLValueCasts(); 1775 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(receiver)) 1776 if (DRE->getDecl() == method->getSelfDecl()) 1777 return true; 1778 return false; 1779 } 1780 1781 /// LookupMethodInType - Look up a method in an ObjCObjectType. 1782 ObjCMethodDecl *Sema::LookupMethodInObjectType(Selector sel, QualType type, 1783 bool isInstance) { 1784 const ObjCObjectType *objType = type->castAs<ObjCObjectType>(); 1785 if (ObjCInterfaceDecl *iface = objType->getInterface()) { 1786 // Look it up in the main interface (and categories, etc.) 1787 if (ObjCMethodDecl *method = iface->lookupMethod(sel, isInstance)) 1788 return method; 1789 1790 // Okay, look for "private" methods declared in any 1791 // @implementations we've seen. 1792 if (ObjCMethodDecl *method = iface->lookupPrivateMethod(sel, isInstance)) 1793 return method; 1794 } 1795 1796 // Check qualifiers. 1797 for (const auto *I : objType->quals()) 1798 if (ObjCMethodDecl *method = I->lookupMethod(sel, isInstance)) 1799 return method; 1800 1801 return nullptr; 1802 } 1803 1804 /// LookupMethodInQualifiedType - Lookups up a method in protocol qualifier 1805 /// list of a qualified objective pointer type. 1806 ObjCMethodDecl *Sema::LookupMethodInQualifiedType(Selector Sel, 1807 const ObjCObjectPointerType *OPT, 1808 bool Instance) 1809 { 1810 ObjCMethodDecl *MD = nullptr; 1811 for (const auto *PROTO : OPT->quals()) { 1812 if ((MD = PROTO->lookupMethod(Sel, Instance))) { 1813 return MD; 1814 } 1815 } 1816 return nullptr; 1817 } 1818 1819 /// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an 1820 /// objective C interface. This is a property reference expression. 1821 ExprResult Sema:: 1822 HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT, 1823 Expr *BaseExpr, SourceLocation OpLoc, 1824 DeclarationName MemberName, 1825 SourceLocation MemberLoc, 1826 SourceLocation SuperLoc, QualType SuperType, 1827 bool Super) { 1828 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType(); 1829 ObjCInterfaceDecl *IFace = IFaceT->getDecl(); 1830 1831 if (!MemberName.isIdentifier()) { 1832 Diag(MemberLoc, diag::err_invalid_property_name) 1833 << MemberName << QualType(OPT, 0); 1834 return ExprError(); 1835 } 1836 1837 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 1838 1839 SourceRange BaseRange = Super? SourceRange(SuperLoc) 1840 : BaseExpr->getSourceRange(); 1841 if (RequireCompleteType(MemberLoc, OPT->getPointeeType(), 1842 diag::err_property_not_found_forward_class, 1843 MemberName, BaseRange)) 1844 return ExprError(); 1845 1846 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration( 1847 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) { 1848 // Check whether we can reference this property. 1849 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1850 return ExprError(); 1851 if (Super) 1852 return new (Context) 1853 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue, 1854 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType); 1855 else 1856 return new (Context) 1857 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue, 1858 OK_ObjCProperty, MemberLoc, BaseExpr); 1859 } 1860 // Check protocols on qualified interfaces. 1861 for (const auto *I : OPT->quals()) 1862 if (ObjCPropertyDecl *PD = I->FindPropertyDeclaration( 1863 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) { 1864 // Check whether we can reference this property. 1865 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1866 return ExprError(); 1867 1868 if (Super) 1869 return new (Context) ObjCPropertyRefExpr( 1870 PD, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty, MemberLoc, 1871 SuperLoc, SuperType); 1872 else 1873 return new (Context) 1874 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue, 1875 OK_ObjCProperty, MemberLoc, BaseExpr); 1876 } 1877 // If that failed, look for an "implicit" property by seeing if the nullary 1878 // selector is implemented. 1879 1880 // FIXME: The logic for looking up nullary and unary selectors should be 1881 // shared with the code in ActOnInstanceMessage. 1882 1883 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 1884 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 1885 1886 // May be found in property's qualified list. 1887 if (!Getter) 1888 Getter = LookupMethodInQualifiedType(Sel, OPT, true); 1889 1890 // If this reference is in an @implementation, check for 'private' methods. 1891 if (!Getter) 1892 Getter = IFace->lookupPrivateMethod(Sel); 1893 1894 if (Getter) { 1895 // Check if we can reference this property. 1896 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 1897 return ExprError(); 1898 } 1899 // If we found a getter then this may be a valid dot-reference, we 1900 // will look for the matching setter, in case it is needed. 1901 Selector SetterSel = 1902 SelectorTable::constructSetterSelector(PP.getIdentifierTable(), 1903 PP.getSelectorTable(), Member); 1904 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 1905 1906 // May be found in property's qualified list. 1907 if (!Setter) 1908 Setter = LookupMethodInQualifiedType(SetterSel, OPT, true); 1909 1910 if (!Setter) { 1911 // If this reference is in an @implementation, also check for 'private' 1912 // methods. 1913 Setter = IFace->lookupPrivateMethod(SetterSel); 1914 } 1915 1916 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 1917 return ExprError(); 1918 1919 // Special warning if member name used in a property-dot for a setter accessor 1920 // does not use a property with same name; e.g. obj.X = ... for a property with 1921 // name 'x'. 1922 if (Setter && Setter->isImplicit() && Setter->isPropertyAccessor() && 1923 !IFace->FindPropertyDeclaration( 1924 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) { 1925 if (const ObjCPropertyDecl *PDecl = Setter->findPropertyDecl()) { 1926 // Do not warn if user is using property-dot syntax to make call to 1927 // user named setter. 1928 if (!(PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter)) 1929 Diag(MemberLoc, 1930 diag::warn_property_access_suggest) 1931 << MemberName << QualType(OPT, 0) << PDecl->getName() 1932 << FixItHint::CreateReplacement(MemberLoc, PDecl->getName()); 1933 } 1934 } 1935 1936 if (Getter || Setter) { 1937 if (Super) 1938 return new (Context) 1939 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue, 1940 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType); 1941 else 1942 return new (Context) 1943 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue, 1944 OK_ObjCProperty, MemberLoc, BaseExpr); 1945 1946 } 1947 1948 // Attempt to correct for typos in property names. 1949 if (TypoCorrection Corrected = 1950 CorrectTypo(DeclarationNameInfo(MemberName, MemberLoc), 1951 LookupOrdinaryName, nullptr, nullptr, 1952 llvm::make_unique<DeclFilterCCC<ObjCPropertyDecl>>(), 1953 CTK_ErrorRecovery, IFace, false, OPT)) { 1954 DeclarationName TypoResult = Corrected.getCorrection(); 1955 if (TypoResult.isIdentifier() && 1956 TypoResult.getAsIdentifierInfo() == Member) { 1957 // There is no need to try the correction if it is the same. 1958 NamedDecl *ChosenDecl = 1959 Corrected.isKeyword() ? nullptr : Corrected.getFoundDecl(); 1960 if (ChosenDecl && isa<ObjCPropertyDecl>(ChosenDecl)) 1961 if (cast<ObjCPropertyDecl>(ChosenDecl)->isClassProperty()) { 1962 // This is a class property, we should not use the instance to 1963 // access it. 1964 Diag(MemberLoc, diag::err_class_property_found) << MemberName 1965 << OPT->getInterfaceDecl()->getName() 1966 << FixItHint::CreateReplacement(BaseExpr->getSourceRange(), 1967 OPT->getInterfaceDecl()->getName()); 1968 return ExprError(); 1969 } 1970 } else { 1971 diagnoseTypo(Corrected, PDiag(diag::err_property_not_found_suggest) 1972 << MemberName << QualType(OPT, 0)); 1973 return HandleExprPropertyRefExpr(OPT, BaseExpr, OpLoc, 1974 TypoResult, MemberLoc, 1975 SuperLoc, SuperType, Super); 1976 } 1977 } 1978 ObjCInterfaceDecl *ClassDeclared; 1979 if (ObjCIvarDecl *Ivar = 1980 IFace->lookupInstanceVariable(Member, ClassDeclared)) { 1981 QualType T = Ivar->getType(); 1982 if (const ObjCObjectPointerType * OBJPT = 1983 T->getAsObjCInterfacePointerType()) { 1984 if (RequireCompleteType(MemberLoc, OBJPT->getPointeeType(), 1985 diag::err_property_not_as_forward_class, 1986 MemberName, BaseExpr)) 1987 return ExprError(); 1988 } 1989 Diag(MemberLoc, 1990 diag::err_ivar_access_using_property_syntax_suggest) 1991 << MemberName << QualType(OPT, 0) << Ivar->getDeclName() 1992 << FixItHint::CreateReplacement(OpLoc, "->"); 1993 return ExprError(); 1994 } 1995 1996 Diag(MemberLoc, diag::err_property_not_found) 1997 << MemberName << QualType(OPT, 0); 1998 if (Setter) 1999 Diag(Setter->getLocation(), diag::note_getter_unavailable) 2000 << MemberName << BaseExpr->getSourceRange(); 2001 return ExprError(); 2002 } 2003 2004 ExprResult Sema:: 2005 ActOnClassPropertyRefExpr(IdentifierInfo &receiverName, 2006 IdentifierInfo &propertyName, 2007 SourceLocation receiverNameLoc, 2008 SourceLocation propertyNameLoc) { 2009 2010 IdentifierInfo *receiverNamePtr = &receiverName; 2011 ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr, 2012 receiverNameLoc); 2013 2014 QualType SuperType; 2015 if (!IFace) { 2016 // If the "receiver" is 'super' in a method, handle it as an expression-like 2017 // property reference. 2018 if (receiverNamePtr->isStr("super")) { 2019 if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf(receiverNameLoc)) { 2020 if (auto classDecl = CurMethod->getClassInterface()) { 2021 SuperType = QualType(classDecl->getSuperClassType(), 0); 2022 if (CurMethod->isInstanceMethod()) { 2023 if (SuperType.isNull()) { 2024 // The current class does not have a superclass. 2025 Diag(receiverNameLoc, diag::err_root_class_cannot_use_super) 2026 << CurMethod->getClassInterface()->getIdentifier(); 2027 return ExprError(); 2028 } 2029 QualType T = Context.getObjCObjectPointerType(SuperType); 2030 2031 return HandleExprPropertyRefExpr(T->castAs<ObjCObjectPointerType>(), 2032 /*BaseExpr*/nullptr, 2033 SourceLocation()/*OpLoc*/, 2034 &propertyName, 2035 propertyNameLoc, 2036 receiverNameLoc, T, true); 2037 } 2038 2039 // Otherwise, if this is a class method, try dispatching to our 2040 // superclass. 2041 IFace = CurMethod->getClassInterface()->getSuperClass(); 2042 } 2043 } 2044 } 2045 2046 if (!IFace) { 2047 Diag(receiverNameLoc, diag::err_expected_either) << tok::identifier 2048 << tok::l_paren; 2049 return ExprError(); 2050 } 2051 } 2052 2053 Selector GetterSel; 2054 Selector SetterSel; 2055 if (auto PD = IFace->FindPropertyDeclaration( 2056 &propertyName, ObjCPropertyQueryKind::OBJC_PR_query_class)) { 2057 GetterSel = PD->getGetterName(); 2058 SetterSel = PD->getSetterName(); 2059 } else { 2060 GetterSel = PP.getSelectorTable().getNullarySelector(&propertyName); 2061 SetterSel = SelectorTable::constructSetterSelector( 2062 PP.getIdentifierTable(), PP.getSelectorTable(), &propertyName); 2063 } 2064 2065 // Search for a declared property first. 2066 ObjCMethodDecl *Getter = IFace->lookupClassMethod(GetterSel); 2067 2068 // If this reference is in an @implementation, check for 'private' methods. 2069 if (!Getter) 2070 Getter = IFace->lookupPrivateClassMethod(GetterSel); 2071 2072 if (Getter) { 2073 // FIXME: refactor/share with ActOnMemberReference(). 2074 // Check if we can reference this property. 2075 if (DiagnoseUseOfDecl(Getter, propertyNameLoc)) 2076 return ExprError(); 2077 } 2078 2079 // Look for the matching setter, in case it is needed. 2080 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); 2081 if (!Setter) { 2082 // If this reference is in an @implementation, also check for 'private' 2083 // methods. 2084 Setter = IFace->lookupPrivateClassMethod(SetterSel); 2085 } 2086 // Look through local category implementations associated with the class. 2087 if (!Setter) 2088 Setter = IFace->getCategoryClassMethod(SetterSel); 2089 2090 if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc)) 2091 return ExprError(); 2092 2093 if (Getter || Setter) { 2094 if (!SuperType.isNull()) 2095 return new (Context) 2096 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue, 2097 OK_ObjCProperty, propertyNameLoc, receiverNameLoc, 2098 SuperType); 2099 2100 return new (Context) ObjCPropertyRefExpr( 2101 Getter, Setter, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty, 2102 propertyNameLoc, receiverNameLoc, IFace); 2103 } 2104 return ExprError(Diag(propertyNameLoc, diag::err_property_not_found) 2105 << &propertyName << Context.getObjCInterfaceType(IFace)); 2106 } 2107 2108 namespace { 2109 2110 class ObjCInterfaceOrSuperCCC : public CorrectionCandidateCallback { 2111 public: 2112 ObjCInterfaceOrSuperCCC(ObjCMethodDecl *Method) { 2113 // Determine whether "super" is acceptable in the current context. 2114 if (Method && Method->getClassInterface()) 2115 WantObjCSuper = Method->getClassInterface()->getSuperClass(); 2116 } 2117 2118 bool ValidateCandidate(const TypoCorrection &candidate) override { 2119 return candidate.getCorrectionDeclAs<ObjCInterfaceDecl>() || 2120 candidate.isKeyword("super"); 2121 } 2122 }; 2123 2124 } // end anonymous namespace 2125 2126 Sema::ObjCMessageKind Sema::getObjCMessageKind(Scope *S, 2127 IdentifierInfo *Name, 2128 SourceLocation NameLoc, 2129 bool IsSuper, 2130 bool HasTrailingDot, 2131 ParsedType &ReceiverType) { 2132 ReceiverType = nullptr; 2133 2134 // If the identifier is "super" and there is no trailing dot, we're 2135 // messaging super. If the identifier is "super" and there is a 2136 // trailing dot, it's an instance message. 2137 if (IsSuper && S->isInObjcMethodScope()) 2138 return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage; 2139 2140 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 2141 LookupName(Result, S); 2142 2143 switch (Result.getResultKind()) { 2144 case LookupResult::NotFound: 2145 // Normal name lookup didn't find anything. If we're in an 2146 // Objective-C method, look for ivars. If we find one, we're done! 2147 // FIXME: This is a hack. Ivar lookup should be part of normal 2148 // lookup. 2149 if (ObjCMethodDecl *Method = getCurMethodDecl()) { 2150 if (!Method->getClassInterface()) { 2151 // Fall back: let the parser try to parse it as an instance message. 2152 return ObjCInstanceMessage; 2153 } 2154 2155 ObjCInterfaceDecl *ClassDeclared; 2156 if (Method->getClassInterface()->lookupInstanceVariable(Name, 2157 ClassDeclared)) 2158 return ObjCInstanceMessage; 2159 } 2160 2161 // Break out; we'll perform typo correction below. 2162 break; 2163 2164 case LookupResult::NotFoundInCurrentInstantiation: 2165 case LookupResult::FoundOverloaded: 2166 case LookupResult::FoundUnresolvedValue: 2167 case LookupResult::Ambiguous: 2168 Result.suppressDiagnostics(); 2169 return ObjCInstanceMessage; 2170 2171 case LookupResult::Found: { 2172 // If the identifier is a class or not, and there is a trailing dot, 2173 // it's an instance message. 2174 if (HasTrailingDot) 2175 return ObjCInstanceMessage; 2176 // We found something. If it's a type, then we have a class 2177 // message. Otherwise, it's an instance message. 2178 NamedDecl *ND = Result.getFoundDecl(); 2179 QualType T; 2180 if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND)) 2181 T = Context.getObjCInterfaceType(Class); 2182 else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND)) { 2183 T = Context.getTypeDeclType(Type); 2184 DiagnoseUseOfDecl(Type, NameLoc); 2185 } 2186 else 2187 return ObjCInstanceMessage; 2188 2189 // We have a class message, and T is the type we're 2190 // messaging. Build source-location information for it. 2191 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc); 2192 ReceiverType = CreateParsedType(T, TSInfo); 2193 return ObjCClassMessage; 2194 } 2195 } 2196 2197 if (TypoCorrection Corrected = CorrectTypo( 2198 Result.getLookupNameInfo(), Result.getLookupKind(), S, nullptr, 2199 llvm::make_unique<ObjCInterfaceOrSuperCCC>(getCurMethodDecl()), 2200 CTK_ErrorRecovery, nullptr, false, nullptr, false)) { 2201 if (Corrected.isKeyword()) { 2202 // If we've found the keyword "super" (the only keyword that would be 2203 // returned by CorrectTypo), this is a send to super. 2204 diagnoseTypo(Corrected, 2205 PDiag(diag::err_unknown_receiver_suggest) << Name); 2206 return ObjCSuperMessage; 2207 } else if (ObjCInterfaceDecl *Class = 2208 Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>()) { 2209 // If we found a declaration, correct when it refers to an Objective-C 2210 // class. 2211 diagnoseTypo(Corrected, 2212 PDiag(diag::err_unknown_receiver_suggest) << Name); 2213 QualType T = Context.getObjCInterfaceType(Class); 2214 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc); 2215 ReceiverType = CreateParsedType(T, TSInfo); 2216 return ObjCClassMessage; 2217 } 2218 } 2219 2220 // Fall back: let the parser try to parse it as an instance message. 2221 return ObjCInstanceMessage; 2222 } 2223 2224 ExprResult Sema::ActOnSuperMessage(Scope *S, 2225 SourceLocation SuperLoc, 2226 Selector Sel, 2227 SourceLocation LBracLoc, 2228 ArrayRef<SourceLocation> SelectorLocs, 2229 SourceLocation RBracLoc, 2230 MultiExprArg Args) { 2231 // Determine whether we are inside a method or not. 2232 ObjCMethodDecl *Method = tryCaptureObjCSelf(SuperLoc); 2233 if (!Method) { 2234 Diag(SuperLoc, diag::err_invalid_receiver_to_message_super); 2235 return ExprError(); 2236 } 2237 2238 ObjCInterfaceDecl *Class = Method->getClassInterface(); 2239 if (!Class) { 2240 Diag(SuperLoc, diag::err_no_super_class_message) 2241 << Method->getDeclName(); 2242 return ExprError(); 2243 } 2244 2245 QualType SuperTy(Class->getSuperClassType(), 0); 2246 if (SuperTy.isNull()) { 2247 // The current class does not have a superclass. 2248 Diag(SuperLoc, diag::err_root_class_cannot_use_super) 2249 << Class->getIdentifier(); 2250 return ExprError(); 2251 } 2252 2253 // We are in a method whose class has a superclass, so 'super' 2254 // is acting as a keyword. 2255 if (Method->getSelector() == Sel) 2256 getCurFunction()->ObjCShouldCallSuper = false; 2257 2258 if (Method->isInstanceMethod()) { 2259 // Since we are in an instance method, this is an instance 2260 // message to the superclass instance. 2261 SuperTy = Context.getObjCObjectPointerType(SuperTy); 2262 return BuildInstanceMessage(nullptr, SuperTy, SuperLoc, 2263 Sel, /*Method=*/nullptr, 2264 LBracLoc, SelectorLocs, RBracLoc, Args); 2265 } 2266 2267 // Since we are in a class method, this is a class message to 2268 // the superclass. 2269 return BuildClassMessage(/*ReceiverTypeInfo=*/nullptr, 2270 SuperTy, 2271 SuperLoc, Sel, /*Method=*/nullptr, 2272 LBracLoc, SelectorLocs, RBracLoc, Args); 2273 } 2274 2275 ExprResult Sema::BuildClassMessageImplicit(QualType ReceiverType, 2276 bool isSuperReceiver, 2277 SourceLocation Loc, 2278 Selector Sel, 2279 ObjCMethodDecl *Method, 2280 MultiExprArg Args) { 2281 TypeSourceInfo *receiverTypeInfo = nullptr; 2282 if (!ReceiverType.isNull()) 2283 receiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType); 2284 2285 return BuildClassMessage(receiverTypeInfo, ReceiverType, 2286 /*SuperLoc=*/isSuperReceiver ? Loc : SourceLocation(), 2287 Sel, Method, Loc, Loc, Loc, Args, 2288 /*isImplicit=*/true); 2289 } 2290 2291 static void applyCocoaAPICheck(Sema &S, const ObjCMessageExpr *Msg, 2292 unsigned DiagID, 2293 bool (*refactor)(const ObjCMessageExpr *, 2294 const NSAPI &, edit::Commit &)) { 2295 SourceLocation MsgLoc = Msg->getExprLoc(); 2296 if (S.Diags.isIgnored(DiagID, MsgLoc)) 2297 return; 2298 2299 SourceManager &SM = S.SourceMgr; 2300 edit::Commit ECommit(SM, S.LangOpts); 2301 if (refactor(Msg,*S.NSAPIObj, ECommit)) { 2302 DiagnosticBuilder Builder = S.Diag(MsgLoc, DiagID) 2303 << Msg->getSelector() << Msg->getSourceRange(); 2304 // FIXME: Don't emit diagnostic at all if fixits are non-commitable. 2305 if (!ECommit.isCommitable()) 2306 return; 2307 for (edit::Commit::edit_iterator 2308 I = ECommit.edit_begin(), E = ECommit.edit_end(); I != E; ++I) { 2309 const edit::Commit::Edit &Edit = *I; 2310 switch (Edit.Kind) { 2311 case edit::Commit::Act_Insert: 2312 Builder.AddFixItHint(FixItHint::CreateInsertion(Edit.OrigLoc, 2313 Edit.Text, 2314 Edit.BeforePrev)); 2315 break; 2316 case edit::Commit::Act_InsertFromRange: 2317 Builder.AddFixItHint( 2318 FixItHint::CreateInsertionFromRange(Edit.OrigLoc, 2319 Edit.getInsertFromRange(SM), 2320 Edit.BeforePrev)); 2321 break; 2322 case edit::Commit::Act_Remove: 2323 Builder.AddFixItHint(FixItHint::CreateRemoval(Edit.getFileRange(SM))); 2324 break; 2325 } 2326 } 2327 } 2328 } 2329 2330 static void checkCocoaAPI(Sema &S, const ObjCMessageExpr *Msg) { 2331 applyCocoaAPICheck(S, Msg, diag::warn_objc_redundant_literal_use, 2332 edit::rewriteObjCRedundantCallWithLiteral); 2333 } 2334 2335 static void checkFoundationAPI(Sema &S, SourceLocation Loc, 2336 const ObjCMethodDecl *Method, 2337 ArrayRef<Expr *> Args, QualType ReceiverType, 2338 bool IsClassObjectCall) { 2339 // Check if this is a performSelector method that uses a selector that returns 2340 // a record or a vector type. 2341 if (Method->getSelector().getMethodFamily() != OMF_performSelector || 2342 Args.empty()) 2343 return; 2344 const auto *SE = dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens()); 2345 if (!SE) 2346 return; 2347 ObjCMethodDecl *ImpliedMethod; 2348 if (!IsClassObjectCall) { 2349 const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>(); 2350 if (!OPT || !OPT->getInterfaceDecl()) 2351 return; 2352 ImpliedMethod = 2353 OPT->getInterfaceDecl()->lookupInstanceMethod(SE->getSelector()); 2354 if (!ImpliedMethod) 2355 ImpliedMethod = 2356 OPT->getInterfaceDecl()->lookupPrivateMethod(SE->getSelector()); 2357 } else { 2358 const auto *IT = ReceiverType->getAs<ObjCInterfaceType>(); 2359 if (!IT) 2360 return; 2361 ImpliedMethod = IT->getDecl()->lookupClassMethod(SE->getSelector()); 2362 if (!ImpliedMethod) 2363 ImpliedMethod = 2364 IT->getDecl()->lookupPrivateClassMethod(SE->getSelector()); 2365 } 2366 if (!ImpliedMethod) 2367 return; 2368 QualType Ret = ImpliedMethod->getReturnType(); 2369 if (Ret->isRecordType() || Ret->isVectorType() || Ret->isExtVectorType()) { 2370 QualType Ret = ImpliedMethod->getReturnType(); 2371 S.Diag(Loc, diag::warn_objc_unsafe_perform_selector) 2372 << Method->getSelector() 2373 << (!Ret->isRecordType() 2374 ? /*Vector*/ 2 2375 : Ret->isUnionType() ? /*Union*/ 1 : /*Struct*/ 0); 2376 S.Diag(ImpliedMethod->getBeginLoc(), 2377 diag::note_objc_unsafe_perform_selector_method_declared_here) 2378 << ImpliedMethod->getSelector() << Ret; 2379 } 2380 } 2381 2382 /// Diagnose use of %s directive in an NSString which is being passed 2383 /// as formatting string to formatting method. 2384 static void 2385 DiagnoseCStringFormatDirectiveInObjCAPI(Sema &S, 2386 ObjCMethodDecl *Method, 2387 Selector Sel, 2388 Expr **Args, unsigned NumArgs) { 2389 unsigned Idx = 0; 2390 bool Format = false; 2391 ObjCStringFormatFamily SFFamily = Sel.getStringFormatFamily(); 2392 if (SFFamily == ObjCStringFormatFamily::SFF_NSString) { 2393 Idx = 0; 2394 Format = true; 2395 } 2396 else if (Method) { 2397 for (const auto *I : Method->specific_attrs<FormatAttr>()) { 2398 if (S.GetFormatNSStringIdx(I, Idx)) { 2399 Format = true; 2400 break; 2401 } 2402 } 2403 } 2404 if (!Format || NumArgs <= Idx) 2405 return; 2406 2407 Expr *FormatExpr = Args[Idx]; 2408 if (ObjCStringLiteral *OSL = 2409 dyn_cast<ObjCStringLiteral>(FormatExpr->IgnoreParenImpCasts())) { 2410 StringLiteral *FormatString = OSL->getString(); 2411 if (S.FormatStringHasSArg(FormatString)) { 2412 S.Diag(FormatExpr->getExprLoc(), diag::warn_objc_cdirective_format_string) 2413 << "%s" << 0 << 0; 2414 if (Method) 2415 S.Diag(Method->getLocation(), diag::note_method_declared_at) 2416 << Method->getDeclName(); 2417 } 2418 } 2419 } 2420 2421 /// Build an Objective-C class message expression. 2422 /// 2423 /// This routine takes care of both normal class messages and 2424 /// class messages to the superclass. 2425 /// 2426 /// \param ReceiverTypeInfo Type source information that describes the 2427 /// receiver of this message. This may be NULL, in which case we are 2428 /// sending to the superclass and \p SuperLoc must be a valid source 2429 /// location. 2430 2431 /// \param ReceiverType The type of the object receiving the 2432 /// message. When \p ReceiverTypeInfo is non-NULL, this is the same 2433 /// type as that refers to. For a superclass send, this is the type of 2434 /// the superclass. 2435 /// 2436 /// \param SuperLoc The location of the "super" keyword in a 2437 /// superclass message. 2438 /// 2439 /// \param Sel The selector to which the message is being sent. 2440 /// 2441 /// \param Method The method that this class message is invoking, if 2442 /// already known. 2443 /// 2444 /// \param LBracLoc The location of the opening square bracket ']'. 2445 /// 2446 /// \param RBracLoc The location of the closing square bracket ']'. 2447 /// 2448 /// \param ArgsIn The message arguments. 2449 ExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo, 2450 QualType ReceiverType, 2451 SourceLocation SuperLoc, 2452 Selector Sel, 2453 ObjCMethodDecl *Method, 2454 SourceLocation LBracLoc, 2455 ArrayRef<SourceLocation> SelectorLocs, 2456 SourceLocation RBracLoc, 2457 MultiExprArg ArgsIn, 2458 bool isImplicit) { 2459 SourceLocation Loc = SuperLoc.isValid()? SuperLoc 2460 : ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin(); 2461 if (LBracLoc.isInvalid()) { 2462 Diag(Loc, diag::err_missing_open_square_message_send) 2463 << FixItHint::CreateInsertion(Loc, "["); 2464 LBracLoc = Loc; 2465 } 2466 ArrayRef<SourceLocation> SelectorSlotLocs; 2467 if (!SelectorLocs.empty() && SelectorLocs.front().isValid()) 2468 SelectorSlotLocs = SelectorLocs; 2469 else 2470 SelectorSlotLocs = Loc; 2471 SourceLocation SelLoc = SelectorSlotLocs.front(); 2472 2473 if (ReceiverType->isDependentType()) { 2474 // If the receiver type is dependent, we can't type-check anything 2475 // at this point. Build a dependent expression. 2476 unsigned NumArgs = ArgsIn.size(); 2477 Expr **Args = ArgsIn.data(); 2478 assert(SuperLoc.isInvalid() && "Message to super with dependent type"); 2479 return ObjCMessageExpr::Create( 2480 Context, ReceiverType, VK_RValue, LBracLoc, ReceiverTypeInfo, Sel, 2481 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs), RBracLoc, 2482 isImplicit); 2483 } 2484 2485 // Find the class to which we are sending this message. 2486 ObjCInterfaceDecl *Class = nullptr; 2487 const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>(); 2488 if (!ClassType || !(Class = ClassType->getInterface())) { 2489 Diag(Loc, diag::err_invalid_receiver_class_message) 2490 << ReceiverType; 2491 return ExprError(); 2492 } 2493 assert(Class && "We don't know which class we're messaging?"); 2494 // objc++ diagnoses during typename annotation. 2495 if (!getLangOpts().CPlusPlus) 2496 (void)DiagnoseUseOfDecl(Class, SelectorSlotLocs); 2497 // Find the method we are messaging. 2498 if (!Method) { 2499 SourceRange TypeRange 2500 = SuperLoc.isValid()? SourceRange(SuperLoc) 2501 : ReceiverTypeInfo->getTypeLoc().getSourceRange(); 2502 if (RequireCompleteType(Loc, Context.getObjCInterfaceType(Class), 2503 (getLangOpts().ObjCAutoRefCount 2504 ? diag::err_arc_receiver_forward_class 2505 : diag::warn_receiver_forward_class), 2506 TypeRange)) { 2507 // A forward class used in messaging is treated as a 'Class' 2508 Method = LookupFactoryMethodInGlobalPool(Sel, 2509 SourceRange(LBracLoc, RBracLoc)); 2510 if (Method && !getLangOpts().ObjCAutoRefCount) 2511 Diag(Method->getLocation(), diag::note_method_sent_forward_class) 2512 << Method->getDeclName(); 2513 } 2514 if (!Method) 2515 Method = Class->lookupClassMethod(Sel); 2516 2517 // If we have an implementation in scope, check "private" methods. 2518 if (!Method) 2519 Method = Class->lookupPrivateClassMethod(Sel); 2520 2521 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs, 2522 nullptr, false, false, Class)) 2523 return ExprError(); 2524 } 2525 2526 // Check the argument types and determine the result type. 2527 QualType ReturnType; 2528 ExprValueKind VK = VK_RValue; 2529 2530 unsigned NumArgs = ArgsIn.size(); 2531 Expr **Args = ArgsIn.data(); 2532 if (CheckMessageArgumentTypes(/*Receiver=*/nullptr, ReceiverType, 2533 MultiExprArg(Args, NumArgs), Sel, SelectorLocs, 2534 Method, true, SuperLoc.isValid(), LBracLoc, 2535 RBracLoc, SourceRange(), ReturnType, VK)) 2536 return ExprError(); 2537 2538 if (Method && !Method->getReturnType()->isVoidType() && 2539 RequireCompleteType(LBracLoc, Method->getReturnType(), 2540 diag::err_illegal_message_expr_incomplete_type)) 2541 return ExprError(); 2542 2543 // Warn about explicit call of +initialize on its own class. But not on 'super'. 2544 if (Method && Method->getMethodFamily() == OMF_initialize) { 2545 if (!SuperLoc.isValid()) { 2546 const ObjCInterfaceDecl *ID = 2547 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext()); 2548 if (ID == Class) { 2549 Diag(Loc, diag::warn_direct_initialize_call); 2550 Diag(Method->getLocation(), diag::note_method_declared_at) 2551 << Method->getDeclName(); 2552 } 2553 } 2554 else if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) { 2555 // [super initialize] is allowed only within an +initialize implementation 2556 if (CurMeth->getMethodFamily() != OMF_initialize) { 2557 Diag(Loc, diag::warn_direct_super_initialize_call); 2558 Diag(Method->getLocation(), diag::note_method_declared_at) 2559 << Method->getDeclName(); 2560 Diag(CurMeth->getLocation(), diag::note_method_declared_at) 2561 << CurMeth->getDeclName(); 2562 } 2563 } 2564 } 2565 2566 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs); 2567 2568 // Construct the appropriate ObjCMessageExpr. 2569 ObjCMessageExpr *Result; 2570 if (SuperLoc.isValid()) 2571 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc, 2572 SuperLoc, /*IsInstanceSuper=*/false, 2573 ReceiverType, Sel, SelectorLocs, 2574 Method, makeArrayRef(Args, NumArgs), 2575 RBracLoc, isImplicit); 2576 else { 2577 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc, 2578 ReceiverTypeInfo, Sel, SelectorLocs, 2579 Method, makeArrayRef(Args, NumArgs), 2580 RBracLoc, isImplicit); 2581 if (!isImplicit) 2582 checkCocoaAPI(*this, Result); 2583 } 2584 if (Method) 2585 checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs), 2586 ReceiverType, /*IsClassObjectCall=*/true); 2587 return MaybeBindToTemporary(Result); 2588 } 2589 2590 // ActOnClassMessage - used for both unary and keyword messages. 2591 // ArgExprs is optional - if it is present, the number of expressions 2592 // is obtained from Sel.getNumArgs(). 2593 ExprResult Sema::ActOnClassMessage(Scope *S, 2594 ParsedType Receiver, 2595 Selector Sel, 2596 SourceLocation LBracLoc, 2597 ArrayRef<SourceLocation> SelectorLocs, 2598 SourceLocation RBracLoc, 2599 MultiExprArg Args) { 2600 TypeSourceInfo *ReceiverTypeInfo; 2601 QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo); 2602 if (ReceiverType.isNull()) 2603 return ExprError(); 2604 2605 if (!ReceiverTypeInfo) 2606 ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc); 2607 2608 return BuildClassMessage(ReceiverTypeInfo, ReceiverType, 2609 /*SuperLoc=*/SourceLocation(), Sel, 2610 /*Method=*/nullptr, LBracLoc, SelectorLocs, RBracLoc, 2611 Args); 2612 } 2613 2614 ExprResult Sema::BuildInstanceMessageImplicit(Expr *Receiver, 2615 QualType ReceiverType, 2616 SourceLocation Loc, 2617 Selector Sel, 2618 ObjCMethodDecl *Method, 2619 MultiExprArg Args) { 2620 return BuildInstanceMessage(Receiver, ReceiverType, 2621 /*SuperLoc=*/!Receiver ? Loc : SourceLocation(), 2622 Sel, Method, Loc, Loc, Loc, Args, 2623 /*isImplicit=*/true); 2624 } 2625 2626 static bool isMethodDeclaredInRootProtocol(Sema &S, const ObjCMethodDecl *M) { 2627 if (!S.NSAPIObj) 2628 return false; 2629 const auto *Protocol = dyn_cast<ObjCProtocolDecl>(M->getDeclContext()); 2630 if (!Protocol) 2631 return false; 2632 const IdentifierInfo *II = S.NSAPIObj->getNSClassId(NSAPI::ClassId_NSObject); 2633 if (const auto *RootClass = dyn_cast_or_null<ObjCInterfaceDecl>( 2634 S.LookupSingleName(S.TUScope, II, Protocol->getBeginLoc(), 2635 Sema::LookupOrdinaryName))) { 2636 for (const ObjCProtocolDecl *P : RootClass->all_referenced_protocols()) { 2637 if (P->getCanonicalDecl() == Protocol->getCanonicalDecl()) 2638 return true; 2639 } 2640 } 2641 return false; 2642 } 2643 2644 /// Build an Objective-C instance message expression. 2645 /// 2646 /// This routine takes care of both normal instance messages and 2647 /// instance messages to the superclass instance. 2648 /// 2649 /// \param Receiver The expression that computes the object that will 2650 /// receive this message. This may be empty, in which case we are 2651 /// sending to the superclass instance and \p SuperLoc must be a valid 2652 /// source location. 2653 /// 2654 /// \param ReceiverType The (static) type of the object receiving the 2655 /// message. When a \p Receiver expression is provided, this is the 2656 /// same type as that expression. For a superclass instance send, this 2657 /// is a pointer to the type of the superclass. 2658 /// 2659 /// \param SuperLoc The location of the "super" keyword in a 2660 /// superclass instance message. 2661 /// 2662 /// \param Sel The selector to which the message is being sent. 2663 /// 2664 /// \param Method The method that this instance message is invoking, if 2665 /// already known. 2666 /// 2667 /// \param LBracLoc The location of the opening square bracket ']'. 2668 /// 2669 /// \param RBracLoc The location of the closing square bracket ']'. 2670 /// 2671 /// \param ArgsIn The message arguments. 2672 ExprResult Sema::BuildInstanceMessage(Expr *Receiver, 2673 QualType ReceiverType, 2674 SourceLocation SuperLoc, 2675 Selector Sel, 2676 ObjCMethodDecl *Method, 2677 SourceLocation LBracLoc, 2678 ArrayRef<SourceLocation> SelectorLocs, 2679 SourceLocation RBracLoc, 2680 MultiExprArg ArgsIn, 2681 bool isImplicit) { 2682 assert((Receiver || SuperLoc.isValid()) && "If the Receiver is null, the " 2683 "SuperLoc must be valid so we can " 2684 "use it instead."); 2685 2686 // The location of the receiver. 2687 SourceLocation Loc = SuperLoc.isValid() ? SuperLoc : Receiver->getBeginLoc(); 2688 SourceRange RecRange = 2689 SuperLoc.isValid()? SuperLoc : Receiver->getSourceRange(); 2690 ArrayRef<SourceLocation> SelectorSlotLocs; 2691 if (!SelectorLocs.empty() && SelectorLocs.front().isValid()) 2692 SelectorSlotLocs = SelectorLocs; 2693 else 2694 SelectorSlotLocs = Loc; 2695 SourceLocation SelLoc = SelectorSlotLocs.front(); 2696 2697 if (LBracLoc.isInvalid()) { 2698 Diag(Loc, diag::err_missing_open_square_message_send) 2699 << FixItHint::CreateInsertion(Loc, "["); 2700 LBracLoc = Loc; 2701 } 2702 2703 // If we have a receiver expression, perform appropriate promotions 2704 // and determine receiver type. 2705 if (Receiver) { 2706 if (Receiver->hasPlaceholderType()) { 2707 ExprResult Result; 2708 if (Receiver->getType() == Context.UnknownAnyTy) 2709 Result = forceUnknownAnyToType(Receiver, Context.getObjCIdType()); 2710 else 2711 Result = CheckPlaceholderExpr(Receiver); 2712 if (Result.isInvalid()) return ExprError(); 2713 Receiver = Result.get(); 2714 } 2715 2716 if (Receiver->isTypeDependent()) { 2717 // If the receiver is type-dependent, we can't type-check anything 2718 // at this point. Build a dependent expression. 2719 unsigned NumArgs = ArgsIn.size(); 2720 Expr **Args = ArgsIn.data(); 2721 assert(SuperLoc.isInvalid() && "Message to super with dependent type"); 2722 return ObjCMessageExpr::Create( 2723 Context, Context.DependentTy, VK_RValue, LBracLoc, Receiver, Sel, 2724 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs), 2725 RBracLoc, isImplicit); 2726 } 2727 2728 // If necessary, apply function/array conversion to the receiver. 2729 // C99 6.7.5.3p[7,8]. 2730 ExprResult Result = DefaultFunctionArrayLvalueConversion(Receiver); 2731 if (Result.isInvalid()) 2732 return ExprError(); 2733 Receiver = Result.get(); 2734 ReceiverType = Receiver->getType(); 2735 2736 // If the receiver is an ObjC pointer, a block pointer, or an 2737 // __attribute__((NSObject)) pointer, we don't need to do any 2738 // special conversion in order to look up a receiver. 2739 if (ReceiverType->isObjCRetainableType()) { 2740 // do nothing 2741 } else if (!getLangOpts().ObjCAutoRefCount && 2742 !Context.getObjCIdType().isNull() && 2743 (ReceiverType->isPointerType() || 2744 ReceiverType->isIntegerType())) { 2745 // Implicitly convert integers and pointers to 'id' but emit a warning. 2746 // But not in ARC. 2747 Diag(Loc, diag::warn_bad_receiver_type) 2748 << ReceiverType 2749 << Receiver->getSourceRange(); 2750 if (ReceiverType->isPointerType()) { 2751 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(), 2752 CK_CPointerToObjCPointerCast).get(); 2753 } else { 2754 // TODO: specialized warning on null receivers? 2755 bool IsNull = Receiver->isNullPointerConstant(Context, 2756 Expr::NPC_ValueDependentIsNull); 2757 CastKind Kind = IsNull ? CK_NullToPointer : CK_IntegralToPointer; 2758 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(), 2759 Kind).get(); 2760 } 2761 ReceiverType = Receiver->getType(); 2762 } else if (getLangOpts().CPlusPlus) { 2763 // The receiver must be a complete type. 2764 if (RequireCompleteType(Loc, Receiver->getType(), 2765 diag::err_incomplete_receiver_type)) 2766 return ExprError(); 2767 2768 ExprResult result = PerformContextuallyConvertToObjCPointer(Receiver); 2769 if (result.isUsable()) { 2770 Receiver = result.get(); 2771 ReceiverType = Receiver->getType(); 2772 } 2773 } 2774 } 2775 2776 if (ReceiverType->isObjCIdType() && !isImplicit) 2777 Diag(Receiver->getExprLoc(), diag::warn_messaging_unqualified_id); 2778 2779 // There's a somewhat weird interaction here where we assume that we 2780 // won't actually have a method unless we also don't need to do some 2781 // of the more detailed type-checking on the receiver. 2782 2783 if (!Method) { 2784 // Handle messages to id and __kindof types (where we use the 2785 // global method pool). 2786 const ObjCObjectType *typeBound = nullptr; 2787 bool receiverIsIdLike = ReceiverType->isObjCIdOrObjectKindOfType(Context, 2788 typeBound); 2789 if (receiverIsIdLike || ReceiverType->isBlockPointerType() || 2790 (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) { 2791 SmallVector<ObjCMethodDecl*, 4> Methods; 2792 // If we have a type bound, further filter the methods. 2793 CollectMultipleMethodsInGlobalPool(Sel, Methods, true/*InstanceFirst*/, 2794 true/*CheckTheOther*/, typeBound); 2795 if (!Methods.empty()) { 2796 // We choose the first method as the initial candidate, then try to 2797 // select a better one. 2798 Method = Methods[0]; 2799 2800 if (ObjCMethodDecl *BestMethod = 2801 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(), Methods)) 2802 Method = BestMethod; 2803 2804 if (!AreMultipleMethodsInGlobalPool(Sel, Method, 2805 SourceRange(LBracLoc, RBracLoc), 2806 receiverIsIdLike, Methods)) 2807 DiagnoseUseOfDecl(Method, SelectorSlotLocs); 2808 } 2809 } else if (ReceiverType->isObjCClassOrClassKindOfType() || 2810 ReceiverType->isObjCQualifiedClassType()) { 2811 // Handle messages to Class. 2812 // We allow sending a message to a qualified Class ("Class<foo>"), which 2813 // is ok as long as one of the protocols implements the selector (if not, 2814 // warn). 2815 if (!ReceiverType->isObjCClassOrClassKindOfType()) { 2816 const ObjCObjectPointerType *QClassTy 2817 = ReceiverType->getAsObjCQualifiedClassType(); 2818 // Search protocols for class methods. 2819 Method = LookupMethodInQualifiedType(Sel, QClassTy, false); 2820 if (!Method) { 2821 Method = LookupMethodInQualifiedType(Sel, QClassTy, true); 2822 // warn if instance method found for a Class message. 2823 if (Method && !isMethodDeclaredInRootProtocol(*this, Method)) { 2824 Diag(SelLoc, diag::warn_instance_method_on_class_found) 2825 << Method->getSelector() << Sel; 2826 Diag(Method->getLocation(), diag::note_method_declared_at) 2827 << Method->getDeclName(); 2828 } 2829 } 2830 } else { 2831 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) { 2832 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) { 2833 // As a guess, try looking for the method in the current interface. 2834 // This very well may not produce the "right" method. 2835 2836 // First check the public methods in the class interface. 2837 Method = ClassDecl->lookupClassMethod(Sel); 2838 2839 if (!Method) 2840 Method = ClassDecl->lookupPrivateClassMethod(Sel); 2841 2842 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs)) 2843 return ExprError(); 2844 } 2845 } 2846 if (!Method) { 2847 // If not messaging 'self', look for any factory method named 'Sel'. 2848 if (!Receiver || !isSelfExpr(Receiver)) { 2849 // If no class (factory) method was found, check if an _instance_ 2850 // method of the same name exists in the root class only. 2851 SmallVector<ObjCMethodDecl*, 4> Methods; 2852 CollectMultipleMethodsInGlobalPool(Sel, Methods, 2853 false/*InstanceFirst*/, 2854 true/*CheckTheOther*/); 2855 if (!Methods.empty()) { 2856 // We choose the first method as the initial candidate, then try 2857 // to select a better one. 2858 Method = Methods[0]; 2859 2860 // If we find an instance method, emit warning. 2861 if (Method->isInstanceMethod()) { 2862 if (const ObjCInterfaceDecl *ID = 2863 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) { 2864 if (ID->getSuperClass()) 2865 Diag(SelLoc, diag::warn_root_inst_method_not_found) 2866 << Sel << SourceRange(LBracLoc, RBracLoc); 2867 } 2868 } 2869 2870 if (ObjCMethodDecl *BestMethod = 2871 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(), 2872 Methods)) 2873 Method = BestMethod; 2874 } 2875 } 2876 } 2877 } 2878 } else { 2879 ObjCInterfaceDecl *ClassDecl = nullptr; 2880 2881 // We allow sending a message to a qualified ID ("id<foo>"), which is ok as 2882 // long as one of the protocols implements the selector (if not, warn). 2883 // And as long as message is not deprecated/unavailable (warn if it is). 2884 if (const ObjCObjectPointerType *QIdTy 2885 = ReceiverType->getAsObjCQualifiedIdType()) { 2886 // Search protocols for instance methods. 2887 Method = LookupMethodInQualifiedType(Sel, QIdTy, true); 2888 if (!Method) 2889 Method = LookupMethodInQualifiedType(Sel, QIdTy, false); 2890 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs)) 2891 return ExprError(); 2892 } else if (const ObjCObjectPointerType *OCIType 2893 = ReceiverType->getAsObjCInterfacePointerType()) { 2894 // We allow sending a message to a pointer to an interface (an object). 2895 ClassDecl = OCIType->getInterfaceDecl(); 2896 2897 // Try to complete the type. Under ARC, this is a hard error from which 2898 // we don't try to recover. 2899 // FIXME: In the non-ARC case, this will still be a hard error if the 2900 // definition is found in a module that's not visible. 2901 const ObjCInterfaceDecl *forwardClass = nullptr; 2902 if (RequireCompleteType(Loc, OCIType->getPointeeType(), 2903 getLangOpts().ObjCAutoRefCount 2904 ? diag::err_arc_receiver_forward_instance 2905 : diag::warn_receiver_forward_instance, 2906 Receiver? Receiver->getSourceRange() 2907 : SourceRange(SuperLoc))) { 2908 if (getLangOpts().ObjCAutoRefCount) 2909 return ExprError(); 2910 2911 forwardClass = OCIType->getInterfaceDecl(); 2912 Diag(Receiver ? Receiver->getBeginLoc() : SuperLoc, 2913 diag::note_receiver_is_id); 2914 Method = nullptr; 2915 } else { 2916 Method = ClassDecl->lookupInstanceMethod(Sel); 2917 } 2918 2919 if (!Method) 2920 // Search protocol qualifiers. 2921 Method = LookupMethodInQualifiedType(Sel, OCIType, true); 2922 2923 if (!Method) { 2924 // If we have implementations in scope, check "private" methods. 2925 Method = ClassDecl->lookupPrivateMethod(Sel); 2926 2927 if (!Method && getLangOpts().ObjCAutoRefCount) { 2928 Diag(SelLoc, diag::err_arc_may_not_respond) 2929 << OCIType->getPointeeType() << Sel << RecRange 2930 << SourceRange(SelectorLocs.front(), SelectorLocs.back()); 2931 return ExprError(); 2932 } 2933 2934 if (!Method && (!Receiver || !isSelfExpr(Receiver))) { 2935 // If we still haven't found a method, look in the global pool. This 2936 // behavior isn't very desirable, however we need it for GCC 2937 // compatibility. FIXME: should we deviate?? 2938 if (OCIType->qual_empty()) { 2939 SmallVector<ObjCMethodDecl*, 4> Methods; 2940 CollectMultipleMethodsInGlobalPool(Sel, Methods, 2941 true/*InstanceFirst*/, 2942 false/*CheckTheOther*/); 2943 if (!Methods.empty()) { 2944 // We choose the first method as the initial candidate, then try 2945 // to select a better one. 2946 Method = Methods[0]; 2947 2948 if (ObjCMethodDecl *BestMethod = 2949 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(), 2950 Methods)) 2951 Method = BestMethod; 2952 2953 AreMultipleMethodsInGlobalPool(Sel, Method, 2954 SourceRange(LBracLoc, RBracLoc), 2955 true/*receiverIdOrClass*/, 2956 Methods); 2957 } 2958 if (Method && !forwardClass) 2959 Diag(SelLoc, diag::warn_maynot_respond) 2960 << OCIType->getInterfaceDecl()->getIdentifier() 2961 << Sel << RecRange; 2962 } 2963 } 2964 } 2965 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs, forwardClass)) 2966 return ExprError(); 2967 } else { 2968 // Reject other random receiver types (e.g. structs). 2969 Diag(Loc, diag::err_bad_receiver_type) 2970 << ReceiverType << Receiver->getSourceRange(); 2971 return ExprError(); 2972 } 2973 } 2974 } 2975 2976 FunctionScopeInfo *DIFunctionScopeInfo = 2977 (Method && Method->getMethodFamily() == OMF_init) 2978 ? getEnclosingFunction() : nullptr; 2979 2980 if (DIFunctionScopeInfo && 2981 DIFunctionScopeInfo->ObjCIsDesignatedInit && 2982 (SuperLoc.isValid() || isSelfExpr(Receiver))) { 2983 bool isDesignatedInitChain = false; 2984 if (SuperLoc.isValid()) { 2985 if (const ObjCObjectPointerType * 2986 OCIType = ReceiverType->getAsObjCInterfacePointerType()) { 2987 if (const ObjCInterfaceDecl *ID = OCIType->getInterfaceDecl()) { 2988 // Either we know this is a designated initializer or we 2989 // conservatively assume it because we don't know for sure. 2990 if (!ID->declaresOrInheritsDesignatedInitializers() || 2991 ID->isDesignatedInitializer(Sel)) { 2992 isDesignatedInitChain = true; 2993 DIFunctionScopeInfo->ObjCWarnForNoDesignatedInitChain = false; 2994 } 2995 } 2996 } 2997 } 2998 if (!isDesignatedInitChain) { 2999 const ObjCMethodDecl *InitMethod = nullptr; 3000 bool isDesignated = 3001 getCurMethodDecl()->isDesignatedInitializerForTheInterface(&InitMethod); 3002 assert(isDesignated && InitMethod); 3003 (void)isDesignated; 3004 Diag(SelLoc, SuperLoc.isValid() ? 3005 diag::warn_objc_designated_init_non_designated_init_call : 3006 diag::warn_objc_designated_init_non_super_designated_init_call); 3007 Diag(InitMethod->getLocation(), 3008 diag::note_objc_designated_init_marked_here); 3009 } 3010 } 3011 3012 if (DIFunctionScopeInfo && 3013 DIFunctionScopeInfo->ObjCIsSecondaryInit && 3014 (SuperLoc.isValid() || isSelfExpr(Receiver))) { 3015 if (SuperLoc.isValid()) { 3016 Diag(SelLoc, diag::warn_objc_secondary_init_super_init_call); 3017 } else { 3018 DIFunctionScopeInfo->ObjCWarnForNoInitDelegation = false; 3019 } 3020 } 3021 3022 // Check the message arguments. 3023 unsigned NumArgs = ArgsIn.size(); 3024 Expr **Args = ArgsIn.data(); 3025 QualType ReturnType; 3026 ExprValueKind VK = VK_RValue; 3027 bool ClassMessage = (ReceiverType->isObjCClassType() || 3028 ReceiverType->isObjCQualifiedClassType()); 3029 if (CheckMessageArgumentTypes(Receiver, ReceiverType, 3030 MultiExprArg(Args, NumArgs), Sel, SelectorLocs, 3031 Method, ClassMessage, SuperLoc.isValid(), 3032 LBracLoc, RBracLoc, RecRange, ReturnType, VK)) 3033 return ExprError(); 3034 3035 if (Method && !Method->getReturnType()->isVoidType() && 3036 RequireCompleteType(LBracLoc, Method->getReturnType(), 3037 diag::err_illegal_message_expr_incomplete_type)) 3038 return ExprError(); 3039 3040 // In ARC, forbid the user from sending messages to 3041 // retain/release/autorelease/dealloc/retainCount explicitly. 3042 if (getLangOpts().ObjCAutoRefCount) { 3043 ObjCMethodFamily family = 3044 (Method ? Method->getMethodFamily() : Sel.getMethodFamily()); 3045 switch (family) { 3046 case OMF_init: 3047 if (Method) 3048 checkInitMethod(Method, ReceiverType); 3049 break; 3050 3051 case OMF_None: 3052 case OMF_alloc: 3053 case OMF_copy: 3054 case OMF_finalize: 3055 case OMF_mutableCopy: 3056 case OMF_new: 3057 case OMF_self: 3058 case OMF_initialize: 3059 break; 3060 3061 case OMF_dealloc: 3062 case OMF_retain: 3063 case OMF_release: 3064 case OMF_autorelease: 3065 case OMF_retainCount: 3066 Diag(SelLoc, diag::err_arc_illegal_explicit_message) 3067 << Sel << RecRange; 3068 break; 3069 3070 case OMF_performSelector: 3071 if (Method && NumArgs >= 1) { 3072 if (const auto *SelExp = 3073 dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens())) { 3074 Selector ArgSel = SelExp->getSelector(); 3075 ObjCMethodDecl *SelMethod = 3076 LookupInstanceMethodInGlobalPool(ArgSel, 3077 SelExp->getSourceRange()); 3078 if (!SelMethod) 3079 SelMethod = 3080 LookupFactoryMethodInGlobalPool(ArgSel, 3081 SelExp->getSourceRange()); 3082 if (SelMethod) { 3083 ObjCMethodFamily SelFamily = SelMethod->getMethodFamily(); 3084 switch (SelFamily) { 3085 case OMF_alloc: 3086 case OMF_copy: 3087 case OMF_mutableCopy: 3088 case OMF_new: 3089 case OMF_init: 3090 // Issue error, unless ns_returns_not_retained. 3091 if (!SelMethod->hasAttr<NSReturnsNotRetainedAttr>()) { 3092 // selector names a +1 method 3093 Diag(SelLoc, 3094 diag::err_arc_perform_selector_retains); 3095 Diag(SelMethod->getLocation(), diag::note_method_declared_at) 3096 << SelMethod->getDeclName(); 3097 } 3098 break; 3099 default: 3100 // +0 call. OK. unless ns_returns_retained. 3101 if (SelMethod->hasAttr<NSReturnsRetainedAttr>()) { 3102 // selector names a +1 method 3103 Diag(SelLoc, 3104 diag::err_arc_perform_selector_retains); 3105 Diag(SelMethod->getLocation(), diag::note_method_declared_at) 3106 << SelMethod->getDeclName(); 3107 } 3108 break; 3109 } 3110 } 3111 } else { 3112 // error (may leak). 3113 Diag(SelLoc, diag::warn_arc_perform_selector_leaks); 3114 Diag(Args[0]->getExprLoc(), diag::note_used_here); 3115 } 3116 } 3117 break; 3118 } 3119 } 3120 3121 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs); 3122 3123 // Construct the appropriate ObjCMessageExpr instance. 3124 ObjCMessageExpr *Result; 3125 if (SuperLoc.isValid()) 3126 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc, 3127 SuperLoc, /*IsInstanceSuper=*/true, 3128 ReceiverType, Sel, SelectorLocs, Method, 3129 makeArrayRef(Args, NumArgs), RBracLoc, 3130 isImplicit); 3131 else { 3132 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc, 3133 Receiver, Sel, SelectorLocs, Method, 3134 makeArrayRef(Args, NumArgs), RBracLoc, 3135 isImplicit); 3136 if (!isImplicit) 3137 checkCocoaAPI(*this, Result); 3138 } 3139 if (Method) { 3140 bool IsClassObjectCall = ClassMessage; 3141 // 'self' message receivers in class methods should be treated as message 3142 // sends to the class object in order for the semantic checks to be 3143 // performed correctly. Messages to 'super' already count as class messages, 3144 // so they don't need to be handled here. 3145 if (Receiver && isSelfExpr(Receiver)) { 3146 if (const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>()) { 3147 if (OPT->getObjectType()->isObjCClass()) { 3148 if (const auto *CurMeth = getCurMethodDecl()) { 3149 IsClassObjectCall = true; 3150 ReceiverType = 3151 Context.getObjCInterfaceType(CurMeth->getClassInterface()); 3152 } 3153 } 3154 } 3155 } 3156 checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs), 3157 ReceiverType, IsClassObjectCall); 3158 } 3159 3160 if (getLangOpts().ObjCAutoRefCount) { 3161 // In ARC, annotate delegate init calls. 3162 if (Result->getMethodFamily() == OMF_init && 3163 (SuperLoc.isValid() || isSelfExpr(Receiver))) { 3164 // Only consider init calls *directly* in init implementations, 3165 // not within blocks. 3166 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(CurContext); 3167 if (method && method->getMethodFamily() == OMF_init) { 3168 // The implicit assignment to self means we also don't want to 3169 // consume the result. 3170 Result->setDelegateInitCall(true); 3171 return Result; 3172 } 3173 } 3174 3175 // In ARC, check for message sends which are likely to introduce 3176 // retain cycles. 3177 checkRetainCycles(Result); 3178 } 3179 3180 if (getLangOpts().ObjCWeak) { 3181 if (!isImplicit && Method) { 3182 if (const ObjCPropertyDecl *Prop = Method->findPropertyDecl()) { 3183 bool IsWeak = 3184 Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak; 3185 if (!IsWeak && Sel.isUnarySelector()) 3186 IsWeak = ReturnType.getObjCLifetime() & Qualifiers::OCL_Weak; 3187 if (IsWeak && !isUnevaluatedContext() && 3188 !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, LBracLoc)) 3189 getCurFunction()->recordUseOfWeak(Result, Prop); 3190 } 3191 } 3192 } 3193 3194 CheckObjCCircularContainer(Result); 3195 3196 return MaybeBindToTemporary(Result); 3197 } 3198 3199 static void RemoveSelectorFromWarningCache(Sema &S, Expr* Arg) { 3200 if (ObjCSelectorExpr *OSE = 3201 dyn_cast<ObjCSelectorExpr>(Arg->IgnoreParenCasts())) { 3202 Selector Sel = OSE->getSelector(); 3203 SourceLocation Loc = OSE->getAtLoc(); 3204 auto Pos = S.ReferencedSelectors.find(Sel); 3205 if (Pos != S.ReferencedSelectors.end() && Pos->second == Loc) 3206 S.ReferencedSelectors.erase(Pos); 3207 } 3208 } 3209 3210 // ActOnInstanceMessage - used for both unary and keyword messages. 3211 // ArgExprs is optional - if it is present, the number of expressions 3212 // is obtained from Sel.getNumArgs(). 3213 ExprResult Sema::ActOnInstanceMessage(Scope *S, 3214 Expr *Receiver, 3215 Selector Sel, 3216 SourceLocation LBracLoc, 3217 ArrayRef<SourceLocation> SelectorLocs, 3218 SourceLocation RBracLoc, 3219 MultiExprArg Args) { 3220 if (!Receiver) 3221 return ExprError(); 3222 3223 // A ParenListExpr can show up while doing error recovery with invalid code. 3224 if (isa<ParenListExpr>(Receiver)) { 3225 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Receiver); 3226 if (Result.isInvalid()) return ExprError(); 3227 Receiver = Result.get(); 3228 } 3229 3230 if (RespondsToSelectorSel.isNull()) { 3231 IdentifierInfo *SelectorId = &Context.Idents.get("respondsToSelector"); 3232 RespondsToSelectorSel = Context.Selectors.getUnarySelector(SelectorId); 3233 } 3234 if (Sel == RespondsToSelectorSel) 3235 RemoveSelectorFromWarningCache(*this, Args[0]); 3236 3237 return BuildInstanceMessage(Receiver, Receiver->getType(), 3238 /*SuperLoc=*/SourceLocation(), Sel, 3239 /*Method=*/nullptr, LBracLoc, SelectorLocs, 3240 RBracLoc, Args); 3241 } 3242 3243 enum ARCConversionTypeClass { 3244 /// int, void, struct A 3245 ACTC_none, 3246 3247 /// id, void (^)() 3248 ACTC_retainable, 3249 3250 /// id*, id***, void (^*)(), 3251 ACTC_indirectRetainable, 3252 3253 /// void* might be a normal C type, or it might a CF type. 3254 ACTC_voidPtr, 3255 3256 /// struct A* 3257 ACTC_coreFoundation 3258 }; 3259 3260 static bool isAnyRetainable(ARCConversionTypeClass ACTC) { 3261 return (ACTC == ACTC_retainable || 3262 ACTC == ACTC_coreFoundation || 3263 ACTC == ACTC_voidPtr); 3264 } 3265 3266 static bool isAnyCLike(ARCConversionTypeClass ACTC) { 3267 return ACTC == ACTC_none || 3268 ACTC == ACTC_voidPtr || 3269 ACTC == ACTC_coreFoundation; 3270 } 3271 3272 static ARCConversionTypeClass classifyTypeForARCConversion(QualType type) { 3273 bool isIndirect = false; 3274 3275 // Ignore an outermost reference type. 3276 if (const ReferenceType *ref = type->getAs<ReferenceType>()) { 3277 type = ref->getPointeeType(); 3278 isIndirect = true; 3279 } 3280 3281 // Drill through pointers and arrays recursively. 3282 while (true) { 3283 if (const PointerType *ptr = type->getAs<PointerType>()) { 3284 type = ptr->getPointeeType(); 3285 3286 // The first level of pointer may be the innermost pointer on a CF type. 3287 if (!isIndirect) { 3288 if (type->isVoidType()) return ACTC_voidPtr; 3289 if (type->isRecordType()) return ACTC_coreFoundation; 3290 } 3291 } else if (const ArrayType *array = type->getAsArrayTypeUnsafe()) { 3292 type = QualType(array->getElementType()->getBaseElementTypeUnsafe(), 0); 3293 } else { 3294 break; 3295 } 3296 isIndirect = true; 3297 } 3298 3299 if (isIndirect) { 3300 if (type->isObjCARCBridgableType()) 3301 return ACTC_indirectRetainable; 3302 return ACTC_none; 3303 } 3304 3305 if (type->isObjCARCBridgableType()) 3306 return ACTC_retainable; 3307 3308 return ACTC_none; 3309 } 3310 3311 namespace { 3312 /// A result from the cast checker. 3313 enum ACCResult { 3314 /// Cannot be casted. 3315 ACC_invalid, 3316 3317 /// Can be safely retained or not retained. 3318 ACC_bottom, 3319 3320 /// Can be casted at +0. 3321 ACC_plusZero, 3322 3323 /// Can be casted at +1. 3324 ACC_plusOne 3325 }; 3326 ACCResult merge(ACCResult left, ACCResult right) { 3327 if (left == right) return left; 3328 if (left == ACC_bottom) return right; 3329 if (right == ACC_bottom) return left; 3330 return ACC_invalid; 3331 } 3332 3333 /// A checker which white-lists certain expressions whose conversion 3334 /// to or from retainable type would otherwise be forbidden in ARC. 3335 class ARCCastChecker : public StmtVisitor<ARCCastChecker, ACCResult> { 3336 typedef StmtVisitor<ARCCastChecker, ACCResult> super; 3337 3338 ASTContext &Context; 3339 ARCConversionTypeClass SourceClass; 3340 ARCConversionTypeClass TargetClass; 3341 bool Diagnose; 3342 3343 static bool isCFType(QualType type) { 3344 // Someday this can use ns_bridged. For now, it has to do this. 3345 return type->isCARCBridgableType(); 3346 } 3347 3348 public: 3349 ARCCastChecker(ASTContext &Context, ARCConversionTypeClass source, 3350 ARCConversionTypeClass target, bool diagnose) 3351 : Context(Context), SourceClass(source), TargetClass(target), 3352 Diagnose(diagnose) {} 3353 3354 using super::Visit; 3355 ACCResult Visit(Expr *e) { 3356 return super::Visit(e->IgnoreParens()); 3357 } 3358 3359 ACCResult VisitStmt(Stmt *s) { 3360 return ACC_invalid; 3361 } 3362 3363 /// Null pointer constants can be casted however you please. 3364 ACCResult VisitExpr(Expr *e) { 3365 if (e->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull)) 3366 return ACC_bottom; 3367 return ACC_invalid; 3368 } 3369 3370 /// Objective-C string literals can be safely casted. 3371 ACCResult VisitObjCStringLiteral(ObjCStringLiteral *e) { 3372 // If we're casting to any retainable type, go ahead. Global 3373 // strings are immune to retains, so this is bottom. 3374 if (isAnyRetainable(TargetClass)) return ACC_bottom; 3375 3376 return ACC_invalid; 3377 } 3378 3379 /// Look through certain implicit and explicit casts. 3380 ACCResult VisitCastExpr(CastExpr *e) { 3381 switch (e->getCastKind()) { 3382 case CK_NullToPointer: 3383 return ACC_bottom; 3384 3385 case CK_NoOp: 3386 case CK_LValueToRValue: 3387 case CK_BitCast: 3388 case CK_CPointerToObjCPointerCast: 3389 case CK_BlockPointerToObjCPointerCast: 3390 case CK_AnyPointerToBlockPointerCast: 3391 return Visit(e->getSubExpr()); 3392 3393 default: 3394 return ACC_invalid; 3395 } 3396 } 3397 3398 /// Look through unary extension. 3399 ACCResult VisitUnaryExtension(UnaryOperator *e) { 3400 return Visit(e->getSubExpr()); 3401 } 3402 3403 /// Ignore the LHS of a comma operator. 3404 ACCResult VisitBinComma(BinaryOperator *e) { 3405 return Visit(e->getRHS()); 3406 } 3407 3408 /// Conditional operators are okay if both sides are okay. 3409 ACCResult VisitConditionalOperator(ConditionalOperator *e) { 3410 ACCResult left = Visit(e->getTrueExpr()); 3411 if (left == ACC_invalid) return ACC_invalid; 3412 return merge(left, Visit(e->getFalseExpr())); 3413 } 3414 3415 /// Look through pseudo-objects. 3416 ACCResult VisitPseudoObjectExpr(PseudoObjectExpr *e) { 3417 // If we're getting here, we should always have a result. 3418 return Visit(e->getResultExpr()); 3419 } 3420 3421 /// Statement expressions are okay if their result expression is okay. 3422 ACCResult VisitStmtExpr(StmtExpr *e) { 3423 return Visit(e->getSubStmt()->body_back()); 3424 } 3425 3426 /// Some declaration references are okay. 3427 ACCResult VisitDeclRefExpr(DeclRefExpr *e) { 3428 VarDecl *var = dyn_cast<VarDecl>(e->getDecl()); 3429 // References to global constants are okay. 3430 if (isAnyRetainable(TargetClass) && 3431 isAnyRetainable(SourceClass) && 3432 var && 3433 !var->hasDefinition(Context) && 3434 var->getType().isConstQualified()) { 3435 3436 // In system headers, they can also be assumed to be immune to retains. 3437 // These are things like 'kCFStringTransformToLatin'. 3438 if (Context.getSourceManager().isInSystemHeader(var->getLocation())) 3439 return ACC_bottom; 3440 3441 return ACC_plusZero; 3442 } 3443 3444 // Nothing else. 3445 return ACC_invalid; 3446 } 3447 3448 /// Some calls are okay. 3449 ACCResult VisitCallExpr(CallExpr *e) { 3450 if (FunctionDecl *fn = e->getDirectCallee()) 3451 if (ACCResult result = checkCallToFunction(fn)) 3452 return result; 3453 3454 return super::VisitCallExpr(e); 3455 } 3456 3457 ACCResult checkCallToFunction(FunctionDecl *fn) { 3458 // Require a CF*Ref return type. 3459 if (!isCFType(fn->getReturnType())) 3460 return ACC_invalid; 3461 3462 if (!isAnyRetainable(TargetClass)) 3463 return ACC_invalid; 3464 3465 // Honor an explicit 'not retained' attribute. 3466 if (fn->hasAttr<CFReturnsNotRetainedAttr>()) 3467 return ACC_plusZero; 3468 3469 // Honor an explicit 'retained' attribute, except that for 3470 // now we're not going to permit implicit handling of +1 results, 3471 // because it's a bit frightening. 3472 if (fn->hasAttr<CFReturnsRetainedAttr>()) 3473 return Diagnose ? ACC_plusOne 3474 : ACC_invalid; // ACC_plusOne if we start accepting this 3475 3476 // Recognize this specific builtin function, which is used by CFSTR. 3477 unsigned builtinID = fn->getBuiltinID(); 3478 if (builtinID == Builtin::BI__builtin___CFStringMakeConstantString) 3479 return ACC_bottom; 3480 3481 // Otherwise, don't do anything implicit with an unaudited function. 3482 if (!fn->hasAttr<CFAuditedTransferAttr>()) 3483 return ACC_invalid; 3484 3485 // Otherwise, it's +0 unless it follows the create convention. 3486 if (ento::coreFoundation::followsCreateRule(fn)) 3487 return Diagnose ? ACC_plusOne 3488 : ACC_invalid; // ACC_plusOne if we start accepting this 3489 3490 return ACC_plusZero; 3491 } 3492 3493 ACCResult VisitObjCMessageExpr(ObjCMessageExpr *e) { 3494 return checkCallToMethod(e->getMethodDecl()); 3495 } 3496 3497 ACCResult VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *e) { 3498 ObjCMethodDecl *method; 3499 if (e->isExplicitProperty()) 3500 method = e->getExplicitProperty()->getGetterMethodDecl(); 3501 else 3502 method = e->getImplicitPropertyGetter(); 3503 return checkCallToMethod(method); 3504 } 3505 3506 ACCResult checkCallToMethod(ObjCMethodDecl *method) { 3507 if (!method) return ACC_invalid; 3508 3509 // Check for message sends to functions returning CF types. We 3510 // just obey the Cocoa conventions with these, even though the 3511 // return type is CF. 3512 if (!isAnyRetainable(TargetClass) || !isCFType(method->getReturnType())) 3513 return ACC_invalid; 3514 3515 // If the method is explicitly marked not-retained, it's +0. 3516 if (method->hasAttr<CFReturnsNotRetainedAttr>()) 3517 return ACC_plusZero; 3518 3519 // If the method is explicitly marked as returning retained, or its 3520 // selector follows a +1 Cocoa convention, treat it as +1. 3521 if (method->hasAttr<CFReturnsRetainedAttr>()) 3522 return ACC_plusOne; 3523 3524 switch (method->getSelector().getMethodFamily()) { 3525 case OMF_alloc: 3526 case OMF_copy: 3527 case OMF_mutableCopy: 3528 case OMF_new: 3529 return ACC_plusOne; 3530 3531 default: 3532 // Otherwise, treat it as +0. 3533 return ACC_plusZero; 3534 } 3535 } 3536 }; 3537 } // end anonymous namespace 3538 3539 bool Sema::isKnownName(StringRef name) { 3540 if (name.empty()) 3541 return false; 3542 LookupResult R(*this, &Context.Idents.get(name), SourceLocation(), 3543 Sema::LookupOrdinaryName); 3544 return LookupName(R, TUScope, false); 3545 } 3546 3547 static void addFixitForObjCARCConversion(Sema &S, 3548 DiagnosticBuilder &DiagB, 3549 Sema::CheckedConversionKind CCK, 3550 SourceLocation afterLParen, 3551 QualType castType, 3552 Expr *castExpr, 3553 Expr *realCast, 3554 const char *bridgeKeyword, 3555 const char *CFBridgeName) { 3556 // We handle C-style and implicit casts here. 3557 switch (CCK) { 3558 case Sema::CCK_ImplicitConversion: 3559 case Sema::CCK_ForBuiltinOverloadedOp: 3560 case Sema::CCK_CStyleCast: 3561 case Sema::CCK_OtherCast: 3562 break; 3563 case Sema::CCK_FunctionalCast: 3564 return; 3565 } 3566 3567 if (CFBridgeName) { 3568 if (CCK == Sema::CCK_OtherCast) { 3569 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) { 3570 SourceRange range(NCE->getOperatorLoc(), 3571 NCE->getAngleBrackets().getEnd()); 3572 SmallString<32> BridgeCall; 3573 3574 SourceManager &SM = S.getSourceManager(); 3575 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1)); 3576 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts())) 3577 BridgeCall += ' '; 3578 3579 BridgeCall += CFBridgeName; 3580 DiagB.AddFixItHint(FixItHint::CreateReplacement(range, BridgeCall)); 3581 } 3582 return; 3583 } 3584 Expr *castedE = castExpr; 3585 if (CStyleCastExpr *CCE = dyn_cast<CStyleCastExpr>(castedE)) 3586 castedE = CCE->getSubExpr(); 3587 castedE = castedE->IgnoreImpCasts(); 3588 SourceRange range = castedE->getSourceRange(); 3589 3590 SmallString<32> BridgeCall; 3591 3592 SourceManager &SM = S.getSourceManager(); 3593 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1)); 3594 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts())) 3595 BridgeCall += ' '; 3596 3597 BridgeCall += CFBridgeName; 3598 3599 if (isa<ParenExpr>(castedE)) { 3600 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(), 3601 BridgeCall)); 3602 } else { 3603 BridgeCall += '('; 3604 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(), 3605 BridgeCall)); 3606 DiagB.AddFixItHint(FixItHint::CreateInsertion( 3607 S.getLocForEndOfToken(range.getEnd()), 3608 ")")); 3609 } 3610 return; 3611 } 3612 3613 if (CCK == Sema::CCK_CStyleCast) { 3614 DiagB.AddFixItHint(FixItHint::CreateInsertion(afterLParen, bridgeKeyword)); 3615 } else if (CCK == Sema::CCK_OtherCast) { 3616 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) { 3617 std::string castCode = "("; 3618 castCode += bridgeKeyword; 3619 castCode += castType.getAsString(); 3620 castCode += ")"; 3621 SourceRange Range(NCE->getOperatorLoc(), 3622 NCE->getAngleBrackets().getEnd()); 3623 DiagB.AddFixItHint(FixItHint::CreateReplacement(Range, castCode)); 3624 } 3625 } else { 3626 std::string castCode = "("; 3627 castCode += bridgeKeyword; 3628 castCode += castType.getAsString(); 3629 castCode += ")"; 3630 Expr *castedE = castExpr->IgnoreImpCasts(); 3631 SourceRange range = castedE->getSourceRange(); 3632 if (isa<ParenExpr>(castedE)) { 3633 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(), 3634 castCode)); 3635 } else { 3636 castCode += "("; 3637 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(), 3638 castCode)); 3639 DiagB.AddFixItHint(FixItHint::CreateInsertion( 3640 S.getLocForEndOfToken(range.getEnd()), 3641 ")")); 3642 } 3643 } 3644 } 3645 3646 template <typename T> 3647 static inline T *getObjCBridgeAttr(const TypedefType *TD) { 3648 TypedefNameDecl *TDNDecl = TD->getDecl(); 3649 QualType QT = TDNDecl->getUnderlyingType(); 3650 if (QT->isPointerType()) { 3651 QT = QT->getPointeeType(); 3652 if (const RecordType *RT = QT->getAs<RecordType>()) 3653 if (RecordDecl *RD = RT->getDecl()->getMostRecentDecl()) 3654 return RD->getAttr<T>(); 3655 } 3656 return nullptr; 3657 } 3658 3659 static ObjCBridgeRelatedAttr *ObjCBridgeRelatedAttrFromType(QualType T, 3660 TypedefNameDecl *&TDNDecl) { 3661 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) { 3662 TDNDecl = TD->getDecl(); 3663 if (ObjCBridgeRelatedAttr *ObjCBAttr = 3664 getObjCBridgeAttr<ObjCBridgeRelatedAttr>(TD)) 3665 return ObjCBAttr; 3666 T = TDNDecl->getUnderlyingType(); 3667 } 3668 return nullptr; 3669 } 3670 3671 static void 3672 diagnoseObjCARCConversion(Sema &S, SourceRange castRange, 3673 QualType castType, ARCConversionTypeClass castACTC, 3674 Expr *castExpr, Expr *realCast, 3675 ARCConversionTypeClass exprACTC, 3676 Sema::CheckedConversionKind CCK) { 3677 SourceLocation loc = 3678 (castRange.isValid() ? castRange.getBegin() : castExpr->getExprLoc()); 3679 3680 if (S.makeUnavailableInSystemHeader(loc, 3681 UnavailableAttr::IR_ARCForbiddenConversion)) 3682 return; 3683 3684 QualType castExprType = castExpr->getType(); 3685 // Defer emitting a diagnostic for bridge-related casts; that will be 3686 // handled by CheckObjCBridgeRelatedConversions. 3687 TypedefNameDecl *TDNDecl = nullptr; 3688 if ((castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable && 3689 ObjCBridgeRelatedAttrFromType(castType, TDNDecl)) || 3690 (exprACTC == ACTC_coreFoundation && castACTC == ACTC_retainable && 3691 ObjCBridgeRelatedAttrFromType(castExprType, TDNDecl))) 3692 return; 3693 3694 unsigned srcKind = 0; 3695 switch (exprACTC) { 3696 case ACTC_none: 3697 case ACTC_coreFoundation: 3698 case ACTC_voidPtr: 3699 srcKind = (castExprType->isPointerType() ? 1 : 0); 3700 break; 3701 case ACTC_retainable: 3702 srcKind = (castExprType->isBlockPointerType() ? 2 : 3); 3703 break; 3704 case ACTC_indirectRetainable: 3705 srcKind = 4; 3706 break; 3707 } 3708 3709 // Check whether this could be fixed with a bridge cast. 3710 SourceLocation afterLParen = S.getLocForEndOfToken(castRange.getBegin()); 3711 SourceLocation noteLoc = afterLParen.isValid() ? afterLParen : loc; 3712 3713 unsigned convKindForDiag = Sema::isCast(CCK) ? 0 : 1; 3714 3715 // Bridge from an ARC type to a CF type. 3716 if (castACTC == ACTC_retainable && isAnyRetainable(exprACTC)) { 3717 3718 S.Diag(loc, diag::err_arc_cast_requires_bridge) 3719 << convKindForDiag 3720 << 2 // of C pointer type 3721 << castExprType 3722 << unsigned(castType->isBlockPointerType()) // to ObjC|block type 3723 << castType 3724 << castRange 3725 << castExpr->getSourceRange(); 3726 bool br = S.isKnownName("CFBridgingRelease"); 3727 ACCResult CreateRule = 3728 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr); 3729 assert(CreateRule != ACC_bottom && "This cast should already be accepted."); 3730 if (CreateRule != ACC_plusOne) 3731 { 3732 DiagnosticBuilder DiagB = 3733 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge) 3734 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge); 3735 3736 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen, 3737 castType, castExpr, realCast, "__bridge ", 3738 nullptr); 3739 } 3740 if (CreateRule != ACC_plusZero) 3741 { 3742 DiagnosticBuilder DiagB = 3743 (CCK == Sema::CCK_OtherCast && !br) ? 3744 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_transfer) << castExprType : 3745 S.Diag(br ? castExpr->getExprLoc() : noteLoc, 3746 diag::note_arc_bridge_transfer) 3747 << castExprType << br; 3748 3749 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen, 3750 castType, castExpr, realCast, "__bridge_transfer ", 3751 br ? "CFBridgingRelease" : nullptr); 3752 } 3753 3754 return; 3755 } 3756 3757 // Bridge from a CF type to an ARC type. 3758 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC)) { 3759 bool br = S.isKnownName("CFBridgingRetain"); 3760 S.Diag(loc, diag::err_arc_cast_requires_bridge) 3761 << convKindForDiag 3762 << unsigned(castExprType->isBlockPointerType()) // of ObjC|block type 3763 << castExprType 3764 << 2 // to C pointer type 3765 << castType 3766 << castRange 3767 << castExpr->getSourceRange(); 3768 ACCResult CreateRule = 3769 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr); 3770 assert(CreateRule != ACC_bottom && "This cast should already be accepted."); 3771 if (CreateRule != ACC_plusOne) 3772 { 3773 DiagnosticBuilder DiagB = 3774 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge) 3775 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge); 3776 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen, 3777 castType, castExpr, realCast, "__bridge ", 3778 nullptr); 3779 } 3780 if (CreateRule != ACC_plusZero) 3781 { 3782 DiagnosticBuilder DiagB = 3783 (CCK == Sema::CCK_OtherCast && !br) ? 3784 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_retained) << castType : 3785 S.Diag(br ? castExpr->getExprLoc() : noteLoc, 3786 diag::note_arc_bridge_retained) 3787 << castType << br; 3788 3789 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen, 3790 castType, castExpr, realCast, "__bridge_retained ", 3791 br ? "CFBridgingRetain" : nullptr); 3792 } 3793 3794 return; 3795 } 3796 3797 S.Diag(loc, diag::err_arc_mismatched_cast) 3798 << !convKindForDiag 3799 << srcKind << castExprType << castType 3800 << castRange << castExpr->getSourceRange(); 3801 } 3802 3803 template <typename TB> 3804 static bool CheckObjCBridgeNSCast(Sema &S, QualType castType, Expr *castExpr, 3805 bool &HadTheAttribute, bool warn) { 3806 QualType T = castExpr->getType(); 3807 HadTheAttribute = false; 3808 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) { 3809 TypedefNameDecl *TDNDecl = TD->getDecl(); 3810 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) { 3811 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) { 3812 HadTheAttribute = true; 3813 if (Parm->isStr("id")) 3814 return true; 3815 3816 NamedDecl *Target = nullptr; 3817 // Check for an existing type with this name. 3818 LookupResult R(S, DeclarationName(Parm), SourceLocation(), 3819 Sema::LookupOrdinaryName); 3820 if (S.LookupName(R, S.TUScope)) { 3821 Target = R.getFoundDecl(); 3822 if (Target && isa<ObjCInterfaceDecl>(Target)) { 3823 ObjCInterfaceDecl *ExprClass = cast<ObjCInterfaceDecl>(Target); 3824 if (const ObjCObjectPointerType *InterfacePointerType = 3825 castType->getAsObjCInterfacePointerType()) { 3826 ObjCInterfaceDecl *CastClass 3827 = InterfacePointerType->getObjectType()->getInterface(); 3828 if ((CastClass == ExprClass) || 3829 (CastClass && CastClass->isSuperClassOf(ExprClass))) 3830 return true; 3831 if (warn) 3832 S.Diag(castExpr->getBeginLoc(), diag::warn_objc_invalid_bridge) 3833 << T << Target->getName() << castType->getPointeeType(); 3834 return false; 3835 } else if (castType->isObjCIdType() || 3836 (S.Context.ObjCObjectAdoptsQTypeProtocols( 3837 castType, ExprClass))) 3838 // ok to cast to 'id'. 3839 // casting to id<p-list> is ok if bridge type adopts all of 3840 // p-list protocols. 3841 return true; 3842 else { 3843 if (warn) { 3844 S.Diag(castExpr->getBeginLoc(), diag::warn_objc_invalid_bridge) 3845 << T << Target->getName() << castType; 3846 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 3847 S.Diag(Target->getBeginLoc(), diag::note_declared_at); 3848 } 3849 return false; 3850 } 3851 } 3852 } else if (!castType->isObjCIdType()) { 3853 S.Diag(castExpr->getBeginLoc(), 3854 diag::err_objc_cf_bridged_not_interface) 3855 << castExpr->getType() << Parm; 3856 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 3857 if (Target) 3858 S.Diag(Target->getBeginLoc(), diag::note_declared_at); 3859 } 3860 return true; 3861 } 3862 return false; 3863 } 3864 T = TDNDecl->getUnderlyingType(); 3865 } 3866 return true; 3867 } 3868 3869 template <typename TB> 3870 static bool CheckObjCBridgeCFCast(Sema &S, QualType castType, Expr *castExpr, 3871 bool &HadTheAttribute, bool warn) { 3872 QualType T = castType; 3873 HadTheAttribute = false; 3874 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) { 3875 TypedefNameDecl *TDNDecl = TD->getDecl(); 3876 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) { 3877 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) { 3878 HadTheAttribute = true; 3879 if (Parm->isStr("id")) 3880 return true; 3881 3882 NamedDecl *Target = nullptr; 3883 // Check for an existing type with this name. 3884 LookupResult R(S, DeclarationName(Parm), SourceLocation(), 3885 Sema::LookupOrdinaryName); 3886 if (S.LookupName(R, S.TUScope)) { 3887 Target = R.getFoundDecl(); 3888 if (Target && isa<ObjCInterfaceDecl>(Target)) { 3889 ObjCInterfaceDecl *CastClass = cast<ObjCInterfaceDecl>(Target); 3890 if (const ObjCObjectPointerType *InterfacePointerType = 3891 castExpr->getType()->getAsObjCInterfacePointerType()) { 3892 ObjCInterfaceDecl *ExprClass 3893 = InterfacePointerType->getObjectType()->getInterface(); 3894 if ((CastClass == ExprClass) || 3895 (ExprClass && CastClass->isSuperClassOf(ExprClass))) 3896 return true; 3897 if (warn) { 3898 S.Diag(castExpr->getBeginLoc(), 3899 diag::warn_objc_invalid_bridge_to_cf) 3900 << castExpr->getType()->getPointeeType() << T; 3901 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 3902 } 3903 return false; 3904 } else if (castExpr->getType()->isObjCIdType() || 3905 (S.Context.QIdProtocolsAdoptObjCObjectProtocols( 3906 castExpr->getType(), CastClass))) 3907 // ok to cast an 'id' expression to a CFtype. 3908 // ok to cast an 'id<plist>' expression to CFtype provided plist 3909 // adopts all of CFtype's ObjetiveC's class plist. 3910 return true; 3911 else { 3912 if (warn) { 3913 S.Diag(castExpr->getBeginLoc(), 3914 diag::warn_objc_invalid_bridge_to_cf) 3915 << castExpr->getType() << castType; 3916 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 3917 S.Diag(Target->getBeginLoc(), diag::note_declared_at); 3918 } 3919 return false; 3920 } 3921 } 3922 } 3923 S.Diag(castExpr->getBeginLoc(), 3924 diag::err_objc_ns_bridged_invalid_cfobject) 3925 << castExpr->getType() << castType; 3926 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 3927 if (Target) 3928 S.Diag(Target->getBeginLoc(), diag::note_declared_at); 3929 return true; 3930 } 3931 return false; 3932 } 3933 T = TDNDecl->getUnderlyingType(); 3934 } 3935 return true; 3936 } 3937 3938 void Sema::CheckTollFreeBridgeCast(QualType castType, Expr *castExpr) { 3939 if (!getLangOpts().ObjC) 3940 return; 3941 // warn in presence of __bridge casting to or from a toll free bridge cast. 3942 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExpr->getType()); 3943 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType); 3944 if (castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) { 3945 bool HasObjCBridgeAttr; 3946 bool ObjCBridgeAttrWillNotWarn = 3947 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr, 3948 false); 3949 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr) 3950 return; 3951 bool HasObjCBridgeMutableAttr; 3952 bool ObjCBridgeMutableAttrWillNotWarn = 3953 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr, 3954 HasObjCBridgeMutableAttr, false); 3955 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr) 3956 return; 3957 3958 if (HasObjCBridgeAttr) 3959 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr, 3960 true); 3961 else if (HasObjCBridgeMutableAttr) 3962 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr, 3963 HasObjCBridgeMutableAttr, true); 3964 } 3965 else if (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable) { 3966 bool HasObjCBridgeAttr; 3967 bool ObjCBridgeAttrWillNotWarn = 3968 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr, 3969 false); 3970 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr) 3971 return; 3972 bool HasObjCBridgeMutableAttr; 3973 bool ObjCBridgeMutableAttrWillNotWarn = 3974 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr, 3975 HasObjCBridgeMutableAttr, false); 3976 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr) 3977 return; 3978 3979 if (HasObjCBridgeAttr) 3980 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr, 3981 true); 3982 else if (HasObjCBridgeMutableAttr) 3983 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr, 3984 HasObjCBridgeMutableAttr, true); 3985 } 3986 } 3987 3988 void Sema::CheckObjCBridgeRelatedCast(QualType castType, Expr *castExpr) { 3989 QualType SrcType = castExpr->getType(); 3990 if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(castExpr)) { 3991 if (PRE->isExplicitProperty()) { 3992 if (ObjCPropertyDecl *PDecl = PRE->getExplicitProperty()) 3993 SrcType = PDecl->getType(); 3994 } 3995 else if (PRE->isImplicitProperty()) { 3996 if (ObjCMethodDecl *Getter = PRE->getImplicitPropertyGetter()) 3997 SrcType = Getter->getReturnType(); 3998 } 3999 } 4000 4001 ARCConversionTypeClass srcExprACTC = classifyTypeForARCConversion(SrcType); 4002 ARCConversionTypeClass castExprACTC = classifyTypeForARCConversion(castType); 4003 if (srcExprACTC != ACTC_retainable || castExprACTC != ACTC_coreFoundation) 4004 return; 4005 CheckObjCBridgeRelatedConversions(castExpr->getBeginLoc(), castType, SrcType, 4006 castExpr); 4007 } 4008 4009 bool Sema::CheckTollFreeBridgeStaticCast(QualType castType, Expr *castExpr, 4010 CastKind &Kind) { 4011 if (!getLangOpts().ObjC) 4012 return false; 4013 ARCConversionTypeClass exprACTC = 4014 classifyTypeForARCConversion(castExpr->getType()); 4015 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType); 4016 if ((castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) || 4017 (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable)) { 4018 CheckTollFreeBridgeCast(castType, castExpr); 4019 Kind = (castACTC == ACTC_coreFoundation) ? CK_BitCast 4020 : CK_CPointerToObjCPointerCast; 4021 return true; 4022 } 4023 return false; 4024 } 4025 4026 bool Sema::checkObjCBridgeRelatedComponents(SourceLocation Loc, 4027 QualType DestType, QualType SrcType, 4028 ObjCInterfaceDecl *&RelatedClass, 4029 ObjCMethodDecl *&ClassMethod, 4030 ObjCMethodDecl *&InstanceMethod, 4031 TypedefNameDecl *&TDNDecl, 4032 bool CfToNs, bool Diagnose) { 4033 QualType T = CfToNs ? SrcType : DestType; 4034 ObjCBridgeRelatedAttr *ObjCBAttr = ObjCBridgeRelatedAttrFromType(T, TDNDecl); 4035 if (!ObjCBAttr) 4036 return false; 4037 4038 IdentifierInfo *RCId = ObjCBAttr->getRelatedClass(); 4039 IdentifierInfo *CMId = ObjCBAttr->getClassMethod(); 4040 IdentifierInfo *IMId = ObjCBAttr->getInstanceMethod(); 4041 if (!RCId) 4042 return false; 4043 NamedDecl *Target = nullptr; 4044 // Check for an existing type with this name. 4045 LookupResult R(*this, DeclarationName(RCId), SourceLocation(), 4046 Sema::LookupOrdinaryName); 4047 if (!LookupName(R, TUScope)) { 4048 if (Diagnose) { 4049 Diag(Loc, diag::err_objc_bridged_related_invalid_class) << RCId 4050 << SrcType << DestType; 4051 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 4052 } 4053 return false; 4054 } 4055 Target = R.getFoundDecl(); 4056 if (Target && isa<ObjCInterfaceDecl>(Target)) 4057 RelatedClass = cast<ObjCInterfaceDecl>(Target); 4058 else { 4059 if (Diagnose) { 4060 Diag(Loc, diag::err_objc_bridged_related_invalid_class_name) << RCId 4061 << SrcType << DestType; 4062 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 4063 if (Target) 4064 Diag(Target->getBeginLoc(), diag::note_declared_at); 4065 } 4066 return false; 4067 } 4068 4069 // Check for an existing class method with the given selector name. 4070 if (CfToNs && CMId) { 4071 Selector Sel = Context.Selectors.getUnarySelector(CMId); 4072 ClassMethod = RelatedClass->lookupMethod(Sel, false); 4073 if (!ClassMethod) { 4074 if (Diagnose) { 4075 Diag(Loc, diag::err_objc_bridged_related_known_method) 4076 << SrcType << DestType << Sel << false; 4077 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 4078 } 4079 return false; 4080 } 4081 } 4082 4083 // Check for an existing instance method with the given selector name. 4084 if (!CfToNs && IMId) { 4085 Selector Sel = Context.Selectors.getNullarySelector(IMId); 4086 InstanceMethod = RelatedClass->lookupMethod(Sel, true); 4087 if (!InstanceMethod) { 4088 if (Diagnose) { 4089 Diag(Loc, diag::err_objc_bridged_related_known_method) 4090 << SrcType << DestType << Sel << true; 4091 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 4092 } 4093 return false; 4094 } 4095 } 4096 return true; 4097 } 4098 4099 bool 4100 Sema::CheckObjCBridgeRelatedConversions(SourceLocation Loc, 4101 QualType DestType, QualType SrcType, 4102 Expr *&SrcExpr, bool Diagnose) { 4103 ARCConversionTypeClass rhsExprACTC = classifyTypeForARCConversion(SrcType); 4104 ARCConversionTypeClass lhsExprACTC = classifyTypeForARCConversion(DestType); 4105 bool CfToNs = (rhsExprACTC == ACTC_coreFoundation && lhsExprACTC == ACTC_retainable); 4106 bool NsToCf = (rhsExprACTC == ACTC_retainable && lhsExprACTC == ACTC_coreFoundation); 4107 if (!CfToNs && !NsToCf) 4108 return false; 4109 4110 ObjCInterfaceDecl *RelatedClass; 4111 ObjCMethodDecl *ClassMethod = nullptr; 4112 ObjCMethodDecl *InstanceMethod = nullptr; 4113 TypedefNameDecl *TDNDecl = nullptr; 4114 if (!checkObjCBridgeRelatedComponents(Loc, DestType, SrcType, RelatedClass, 4115 ClassMethod, InstanceMethod, TDNDecl, 4116 CfToNs, Diagnose)) 4117 return false; 4118 4119 if (CfToNs) { 4120 // Implicit conversion from CF to ObjC object is needed. 4121 if (ClassMethod) { 4122 if (Diagnose) { 4123 std::string ExpressionString = "["; 4124 ExpressionString += RelatedClass->getNameAsString(); 4125 ExpressionString += " "; 4126 ExpressionString += ClassMethod->getSelector().getAsString(); 4127 SourceLocation SrcExprEndLoc = 4128 getLocForEndOfToken(SrcExpr->getEndLoc()); 4129 // Provide a fixit: [RelatedClass ClassMethod SrcExpr] 4130 Diag(Loc, diag::err_objc_bridged_related_known_method) 4131 << SrcType << DestType << ClassMethod->getSelector() << false 4132 << FixItHint::CreateInsertion(SrcExpr->getBeginLoc(), 4133 ExpressionString) 4134 << FixItHint::CreateInsertion(SrcExprEndLoc, "]"); 4135 Diag(RelatedClass->getBeginLoc(), diag::note_declared_at); 4136 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 4137 4138 QualType receiverType = Context.getObjCInterfaceType(RelatedClass); 4139 // Argument. 4140 Expr *args[] = { SrcExpr }; 4141 ExprResult msg = BuildClassMessageImplicit(receiverType, false, 4142 ClassMethod->getLocation(), 4143 ClassMethod->getSelector(), ClassMethod, 4144 MultiExprArg(args, 1)); 4145 SrcExpr = msg.get(); 4146 } 4147 return true; 4148 } 4149 } 4150 else { 4151 // Implicit conversion from ObjC type to CF object is needed. 4152 if (InstanceMethod) { 4153 if (Diagnose) { 4154 std::string ExpressionString; 4155 SourceLocation SrcExprEndLoc = 4156 getLocForEndOfToken(SrcExpr->getEndLoc()); 4157 if (InstanceMethod->isPropertyAccessor()) 4158 if (const ObjCPropertyDecl *PDecl = 4159 InstanceMethod->findPropertyDecl()) { 4160 // fixit: ObjectExpr.propertyname when it is aproperty accessor. 4161 ExpressionString = "."; 4162 ExpressionString += PDecl->getNameAsString(); 4163 Diag(Loc, diag::err_objc_bridged_related_known_method) 4164 << SrcType << DestType << InstanceMethod->getSelector() << true 4165 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString); 4166 } 4167 if (ExpressionString.empty()) { 4168 // Provide a fixit: [ObjectExpr InstanceMethod] 4169 ExpressionString = " "; 4170 ExpressionString += InstanceMethod->getSelector().getAsString(); 4171 ExpressionString += "]"; 4172 4173 Diag(Loc, diag::err_objc_bridged_related_known_method) 4174 << SrcType << DestType << InstanceMethod->getSelector() << true 4175 << FixItHint::CreateInsertion(SrcExpr->getBeginLoc(), "[") 4176 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString); 4177 } 4178 Diag(RelatedClass->getBeginLoc(), diag::note_declared_at); 4179 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 4180 4181 ExprResult msg = 4182 BuildInstanceMessageImplicit(SrcExpr, SrcType, 4183 InstanceMethod->getLocation(), 4184 InstanceMethod->getSelector(), 4185 InstanceMethod, None); 4186 SrcExpr = msg.get(); 4187 } 4188 return true; 4189 } 4190 } 4191 return false; 4192 } 4193 4194 Sema::ARCConversionResult 4195 Sema::CheckObjCConversion(SourceRange castRange, QualType castType, 4196 Expr *&castExpr, CheckedConversionKind CCK, 4197 bool Diagnose, bool DiagnoseCFAudited, 4198 BinaryOperatorKind Opc) { 4199 QualType castExprType = castExpr->getType(); 4200 4201 // For the purposes of the classification, we assume reference types 4202 // will bind to temporaries. 4203 QualType effCastType = castType; 4204 if (const ReferenceType *ref = castType->getAs<ReferenceType>()) 4205 effCastType = ref->getPointeeType(); 4206 4207 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExprType); 4208 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(effCastType); 4209 if (exprACTC == castACTC) { 4210 // Check for viability and report error if casting an rvalue to a 4211 // life-time qualifier. 4212 if (castACTC == ACTC_retainable && 4213 (CCK == CCK_CStyleCast || CCK == CCK_OtherCast) && 4214 castType != castExprType) { 4215 const Type *DT = castType.getTypePtr(); 4216 QualType QDT = castType; 4217 // We desugar some types but not others. We ignore those 4218 // that cannot happen in a cast; i.e. auto, and those which 4219 // should not be de-sugared; i.e typedef. 4220 if (const ParenType *PT = dyn_cast<ParenType>(DT)) 4221 QDT = PT->desugar(); 4222 else if (const TypeOfType *TP = dyn_cast<TypeOfType>(DT)) 4223 QDT = TP->desugar(); 4224 else if (const AttributedType *AT = dyn_cast<AttributedType>(DT)) 4225 QDT = AT->desugar(); 4226 if (QDT != castType && 4227 QDT.getObjCLifetime() != Qualifiers::OCL_None) { 4228 if (Diagnose) { 4229 SourceLocation loc = (castRange.isValid() ? castRange.getBegin() 4230 : castExpr->getExprLoc()); 4231 Diag(loc, diag::err_arc_nolifetime_behavior); 4232 } 4233 return ACR_error; 4234 } 4235 } 4236 return ACR_okay; 4237 } 4238 4239 // The life-time qualifier cast check above is all we need for ObjCWeak. 4240 // ObjCAutoRefCount has more restrictions on what is legal. 4241 if (!getLangOpts().ObjCAutoRefCount) 4242 return ACR_okay; 4243 4244 if (isAnyCLike(exprACTC) && isAnyCLike(castACTC)) return ACR_okay; 4245 4246 // Allow all of these types to be cast to integer types (but not 4247 // vice-versa). 4248 if (castACTC == ACTC_none && castType->isIntegralType(Context)) 4249 return ACR_okay; 4250 4251 // Allow casts between pointers to lifetime types (e.g., __strong id*) 4252 // and pointers to void (e.g., cv void *). Casting from void* to lifetime* 4253 // must be explicit. 4254 if (exprACTC == ACTC_indirectRetainable && castACTC == ACTC_voidPtr) 4255 return ACR_okay; 4256 if (castACTC == ACTC_indirectRetainable && exprACTC == ACTC_voidPtr && 4257 isCast(CCK)) 4258 return ACR_okay; 4259 4260 switch (ARCCastChecker(Context, exprACTC, castACTC, false).Visit(castExpr)) { 4261 // For invalid casts, fall through. 4262 case ACC_invalid: 4263 break; 4264 4265 // Do nothing for both bottom and +0. 4266 case ACC_bottom: 4267 case ACC_plusZero: 4268 return ACR_okay; 4269 4270 // If the result is +1, consume it here. 4271 case ACC_plusOne: 4272 castExpr = ImplicitCastExpr::Create(Context, castExpr->getType(), 4273 CK_ARCConsumeObject, castExpr, 4274 nullptr, VK_RValue); 4275 Cleanup.setExprNeedsCleanups(true); 4276 return ACR_okay; 4277 } 4278 4279 // If this is a non-implicit cast from id or block type to a 4280 // CoreFoundation type, delay complaining in case the cast is used 4281 // in an acceptable context. 4282 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC) && isCast(CCK)) 4283 return ACR_unbridged; 4284 4285 // Issue a diagnostic about a missing @-sign when implicit casting a cstring 4286 // to 'NSString *', instead of falling through to report a "bridge cast" 4287 // diagnostic. 4288 if (castACTC == ACTC_retainable && exprACTC == ACTC_none && 4289 ConversionToObjCStringLiteralCheck(castType, castExpr, Diagnose)) 4290 return ACR_error; 4291 4292 // Do not issue "bridge cast" diagnostic when implicit casting 4293 // a retainable object to a CF type parameter belonging to an audited 4294 // CF API function. Let caller issue a normal type mismatched diagnostic 4295 // instead. 4296 if ((!DiagnoseCFAudited || exprACTC != ACTC_retainable || 4297 castACTC != ACTC_coreFoundation) && 4298 !(exprACTC == ACTC_voidPtr && castACTC == ACTC_retainable && 4299 (Opc == BO_NE || Opc == BO_EQ))) { 4300 if (Diagnose) 4301 diagnoseObjCARCConversion(*this, castRange, castType, castACTC, castExpr, 4302 castExpr, exprACTC, CCK); 4303 return ACR_error; 4304 } 4305 return ACR_okay; 4306 } 4307 4308 /// Given that we saw an expression with the ARCUnbridgedCastTy 4309 /// placeholder type, complain bitterly. 4310 void Sema::diagnoseARCUnbridgedCast(Expr *e) { 4311 // We expect the spurious ImplicitCastExpr to already have been stripped. 4312 assert(!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)); 4313 CastExpr *realCast = cast<CastExpr>(e->IgnoreParens()); 4314 4315 SourceRange castRange; 4316 QualType castType; 4317 CheckedConversionKind CCK; 4318 4319 if (CStyleCastExpr *cast = dyn_cast<CStyleCastExpr>(realCast)) { 4320 castRange = SourceRange(cast->getLParenLoc(), cast->getRParenLoc()); 4321 castType = cast->getTypeAsWritten(); 4322 CCK = CCK_CStyleCast; 4323 } else if (ExplicitCastExpr *cast = dyn_cast<ExplicitCastExpr>(realCast)) { 4324 castRange = cast->getTypeInfoAsWritten()->getTypeLoc().getSourceRange(); 4325 castType = cast->getTypeAsWritten(); 4326 CCK = CCK_OtherCast; 4327 } else { 4328 llvm_unreachable("Unexpected ImplicitCastExpr"); 4329 } 4330 4331 ARCConversionTypeClass castACTC = 4332 classifyTypeForARCConversion(castType.getNonReferenceType()); 4333 4334 Expr *castExpr = realCast->getSubExpr(); 4335 assert(classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable); 4336 4337 diagnoseObjCARCConversion(*this, castRange, castType, castACTC, 4338 castExpr, realCast, ACTC_retainable, CCK); 4339 } 4340 4341 /// stripARCUnbridgedCast - Given an expression of ARCUnbridgedCast 4342 /// type, remove the placeholder cast. 4343 Expr *Sema::stripARCUnbridgedCast(Expr *e) { 4344 assert(e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)); 4345 4346 if (ParenExpr *pe = dyn_cast<ParenExpr>(e)) { 4347 Expr *sub = stripARCUnbridgedCast(pe->getSubExpr()); 4348 return new (Context) ParenExpr(pe->getLParen(), pe->getRParen(), sub); 4349 } else if (UnaryOperator *uo = dyn_cast<UnaryOperator>(e)) { 4350 assert(uo->getOpcode() == UO_Extension); 4351 Expr *sub = stripARCUnbridgedCast(uo->getSubExpr()); 4352 return new (Context) 4353 UnaryOperator(sub, UO_Extension, sub->getType(), sub->getValueKind(), 4354 sub->getObjectKind(), uo->getOperatorLoc(), false); 4355 } else if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) { 4356 assert(!gse->isResultDependent()); 4357 4358 unsigned n = gse->getNumAssocs(); 4359 SmallVector<Expr *, 4> subExprs; 4360 SmallVector<TypeSourceInfo *, 4> subTypes; 4361 subExprs.reserve(n); 4362 subTypes.reserve(n); 4363 for (const GenericSelectionExpr::Association &assoc : gse->associations()) { 4364 subTypes.push_back(assoc.getTypeSourceInfo()); 4365 Expr *sub = assoc.getAssociationExpr(); 4366 if (assoc.isSelected()) 4367 sub = stripARCUnbridgedCast(sub); 4368 subExprs.push_back(sub); 4369 } 4370 4371 return GenericSelectionExpr::Create( 4372 Context, gse->getGenericLoc(), gse->getControllingExpr(), subTypes, 4373 subExprs, gse->getDefaultLoc(), gse->getRParenLoc(), 4374 gse->containsUnexpandedParameterPack(), gse->getResultIndex()); 4375 } else { 4376 assert(isa<ImplicitCastExpr>(e) && "bad form of unbridged cast!"); 4377 return cast<ImplicitCastExpr>(e)->getSubExpr(); 4378 } 4379 } 4380 4381 bool Sema::CheckObjCARCUnavailableWeakConversion(QualType castType, 4382 QualType exprType) { 4383 QualType canCastType = 4384 Context.getCanonicalType(castType).getUnqualifiedType(); 4385 QualType canExprType = 4386 Context.getCanonicalType(exprType).getUnqualifiedType(); 4387 if (isa<ObjCObjectPointerType>(canCastType) && 4388 castType.getObjCLifetime() == Qualifiers::OCL_Weak && 4389 canExprType->isObjCObjectPointerType()) { 4390 if (const ObjCObjectPointerType *ObjT = 4391 canExprType->getAs<ObjCObjectPointerType>()) 4392 if (const ObjCInterfaceDecl *ObjI = ObjT->getInterfaceDecl()) 4393 return !ObjI->isArcWeakrefUnavailable(); 4394 } 4395 return true; 4396 } 4397 4398 /// Look for an ObjCReclaimReturnedObject cast and destroy it. 4399 static Expr *maybeUndoReclaimObject(Expr *e) { 4400 Expr *curExpr = e, *prevExpr = nullptr; 4401 4402 // Walk down the expression until we hit an implicit cast of kind 4403 // ARCReclaimReturnedObject or an Expr that is neither a Paren nor a Cast. 4404 while (true) { 4405 if (auto *pe = dyn_cast<ParenExpr>(curExpr)) { 4406 prevExpr = curExpr; 4407 curExpr = pe->getSubExpr(); 4408 continue; 4409 } 4410 4411 if (auto *ce = dyn_cast<CastExpr>(curExpr)) { 4412 if (auto *ice = dyn_cast<ImplicitCastExpr>(ce)) 4413 if (ice->getCastKind() == CK_ARCReclaimReturnedObject) { 4414 if (!prevExpr) 4415 return ice->getSubExpr(); 4416 if (auto *pe = dyn_cast<ParenExpr>(prevExpr)) 4417 pe->setSubExpr(ice->getSubExpr()); 4418 else 4419 cast<CastExpr>(prevExpr)->setSubExpr(ice->getSubExpr()); 4420 return e; 4421 } 4422 4423 prevExpr = curExpr; 4424 curExpr = ce->getSubExpr(); 4425 continue; 4426 } 4427 4428 // Break out of the loop if curExpr is neither a Paren nor a Cast. 4429 break; 4430 } 4431 4432 return e; 4433 } 4434 4435 ExprResult Sema::BuildObjCBridgedCast(SourceLocation LParenLoc, 4436 ObjCBridgeCastKind Kind, 4437 SourceLocation BridgeKeywordLoc, 4438 TypeSourceInfo *TSInfo, 4439 Expr *SubExpr) { 4440 ExprResult SubResult = UsualUnaryConversions(SubExpr); 4441 if (SubResult.isInvalid()) return ExprError(); 4442 SubExpr = SubResult.get(); 4443 4444 QualType T = TSInfo->getType(); 4445 QualType FromType = SubExpr->getType(); 4446 4447 CastKind CK; 4448 4449 bool MustConsume = false; 4450 if (T->isDependentType() || SubExpr->isTypeDependent()) { 4451 // Okay: we'll build a dependent expression type. 4452 CK = CK_Dependent; 4453 } else if (T->isObjCARCBridgableType() && FromType->isCARCBridgableType()) { 4454 // Casting CF -> id 4455 CK = (T->isBlockPointerType() ? CK_AnyPointerToBlockPointerCast 4456 : CK_CPointerToObjCPointerCast); 4457 switch (Kind) { 4458 case OBC_Bridge: 4459 break; 4460 4461 case OBC_BridgeRetained: { 4462 bool br = isKnownName("CFBridgingRelease"); 4463 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind) 4464 << 2 4465 << FromType 4466 << (T->isBlockPointerType()? 1 : 0) 4467 << T 4468 << SubExpr->getSourceRange() 4469 << Kind; 4470 Diag(BridgeKeywordLoc, diag::note_arc_bridge) 4471 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge"); 4472 Diag(BridgeKeywordLoc, diag::note_arc_bridge_transfer) 4473 << FromType << br 4474 << FixItHint::CreateReplacement(BridgeKeywordLoc, 4475 br ? "CFBridgingRelease " 4476 : "__bridge_transfer "); 4477 4478 Kind = OBC_Bridge; 4479 break; 4480 } 4481 4482 case OBC_BridgeTransfer: 4483 // We must consume the Objective-C object produced by the cast. 4484 MustConsume = true; 4485 break; 4486 } 4487 } else if (T->isCARCBridgableType() && FromType->isObjCARCBridgableType()) { 4488 // Okay: id -> CF 4489 CK = CK_BitCast; 4490 switch (Kind) { 4491 case OBC_Bridge: 4492 // Reclaiming a value that's going to be __bridge-casted to CF 4493 // is very dangerous, so we don't do it. 4494 SubExpr = maybeUndoReclaimObject(SubExpr); 4495 break; 4496 4497 case OBC_BridgeRetained: 4498 // Produce the object before casting it. 4499 SubExpr = ImplicitCastExpr::Create(Context, FromType, 4500 CK_ARCProduceObject, 4501 SubExpr, nullptr, VK_RValue); 4502 break; 4503 4504 case OBC_BridgeTransfer: { 4505 bool br = isKnownName("CFBridgingRetain"); 4506 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind) 4507 << (FromType->isBlockPointerType()? 1 : 0) 4508 << FromType 4509 << 2 4510 << T 4511 << SubExpr->getSourceRange() 4512 << Kind; 4513 4514 Diag(BridgeKeywordLoc, diag::note_arc_bridge) 4515 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge "); 4516 Diag(BridgeKeywordLoc, diag::note_arc_bridge_retained) 4517 << T << br 4518 << FixItHint::CreateReplacement(BridgeKeywordLoc, 4519 br ? "CFBridgingRetain " : "__bridge_retained"); 4520 4521 Kind = OBC_Bridge; 4522 break; 4523 } 4524 } 4525 } else { 4526 Diag(LParenLoc, diag::err_arc_bridge_cast_incompatible) 4527 << FromType << T << Kind 4528 << SubExpr->getSourceRange() 4529 << TSInfo->getTypeLoc().getSourceRange(); 4530 return ExprError(); 4531 } 4532 4533 Expr *Result = new (Context) ObjCBridgedCastExpr(LParenLoc, Kind, CK, 4534 BridgeKeywordLoc, 4535 TSInfo, SubExpr); 4536 4537 if (MustConsume) { 4538 Cleanup.setExprNeedsCleanups(true); 4539 Result = ImplicitCastExpr::Create(Context, T, CK_ARCConsumeObject, Result, 4540 nullptr, VK_RValue); 4541 } 4542 4543 return Result; 4544 } 4545 4546 ExprResult Sema::ActOnObjCBridgedCast(Scope *S, 4547 SourceLocation LParenLoc, 4548 ObjCBridgeCastKind Kind, 4549 SourceLocation BridgeKeywordLoc, 4550 ParsedType Type, 4551 SourceLocation RParenLoc, 4552 Expr *SubExpr) { 4553 TypeSourceInfo *TSInfo = nullptr; 4554 QualType T = GetTypeFromParser(Type, &TSInfo); 4555 if (Kind == OBC_Bridge) 4556 CheckTollFreeBridgeCast(T, SubExpr); 4557 if (!TSInfo) 4558 TSInfo = Context.getTrivialTypeSourceInfo(T, LParenLoc); 4559 return BuildObjCBridgedCast(LParenLoc, Kind, BridgeKeywordLoc, TSInfo, 4560 SubExpr); 4561 } 4562