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.getStringLiteralArrayType(Context.CharTy, Str.size()); 1101 } 1102 1103 return new (Context) ObjCEncodeExpr(StrTy, EncodedTypeInfo, AtLoc, RParenLoc); 1104 } 1105 1106 ExprResult Sema::ParseObjCEncodeExpression(SourceLocation AtLoc, 1107 SourceLocation EncodeLoc, 1108 SourceLocation LParenLoc, 1109 ParsedType ty, 1110 SourceLocation RParenLoc) { 1111 // FIXME: Preserve type source info ? 1112 TypeSourceInfo *TInfo; 1113 QualType EncodedType = GetTypeFromParser(ty, &TInfo); 1114 if (!TInfo) 1115 TInfo = Context.getTrivialTypeSourceInfo(EncodedType, 1116 getLocForEndOfToken(LParenLoc)); 1117 1118 return BuildObjCEncodeExpression(AtLoc, TInfo, RParenLoc); 1119 } 1120 1121 static bool HelperToDiagnoseMismatchedMethodsInGlobalPool(Sema &S, 1122 SourceLocation AtLoc, 1123 SourceLocation LParenLoc, 1124 SourceLocation RParenLoc, 1125 ObjCMethodDecl *Method, 1126 ObjCMethodList &MethList) { 1127 ObjCMethodList *M = &MethList; 1128 bool Warned = false; 1129 for (M = M->getNext(); M; M=M->getNext()) { 1130 ObjCMethodDecl *MatchingMethodDecl = M->getMethod(); 1131 if (MatchingMethodDecl == Method || 1132 isa<ObjCImplDecl>(MatchingMethodDecl->getDeclContext()) || 1133 MatchingMethodDecl->getSelector() != Method->getSelector()) 1134 continue; 1135 if (!S.MatchTwoMethodDeclarations(Method, 1136 MatchingMethodDecl, Sema::MMS_loose)) { 1137 if (!Warned) { 1138 Warned = true; 1139 S.Diag(AtLoc, diag::warn_multiple_selectors) 1140 << Method->getSelector() << FixItHint::CreateInsertion(LParenLoc, "(") 1141 << FixItHint::CreateInsertion(RParenLoc, ")"); 1142 S.Diag(Method->getLocation(), diag::note_method_declared_at) 1143 << Method->getDeclName(); 1144 } 1145 S.Diag(MatchingMethodDecl->getLocation(), diag::note_method_declared_at) 1146 << MatchingMethodDecl->getDeclName(); 1147 } 1148 } 1149 return Warned; 1150 } 1151 1152 static void DiagnoseMismatchedSelectors(Sema &S, SourceLocation AtLoc, 1153 ObjCMethodDecl *Method, 1154 SourceLocation LParenLoc, 1155 SourceLocation RParenLoc, 1156 bool WarnMultipleSelectors) { 1157 if (!WarnMultipleSelectors || 1158 S.Diags.isIgnored(diag::warn_multiple_selectors, SourceLocation())) 1159 return; 1160 bool Warned = false; 1161 for (Sema::GlobalMethodPool::iterator b = S.MethodPool.begin(), 1162 e = S.MethodPool.end(); b != e; b++) { 1163 // first, instance methods 1164 ObjCMethodList &InstMethList = b->second.first; 1165 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc, 1166 Method, InstMethList)) 1167 Warned = true; 1168 1169 // second, class methods 1170 ObjCMethodList &ClsMethList = b->second.second; 1171 if (HelperToDiagnoseMismatchedMethodsInGlobalPool(S, AtLoc, LParenLoc, RParenLoc, 1172 Method, ClsMethList) || Warned) 1173 return; 1174 } 1175 } 1176 1177 ExprResult Sema::ParseObjCSelectorExpression(Selector Sel, 1178 SourceLocation AtLoc, 1179 SourceLocation SelLoc, 1180 SourceLocation LParenLoc, 1181 SourceLocation RParenLoc, 1182 bool WarnMultipleSelectors) { 1183 ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel, 1184 SourceRange(LParenLoc, RParenLoc)); 1185 if (!Method) 1186 Method = LookupFactoryMethodInGlobalPool(Sel, 1187 SourceRange(LParenLoc, RParenLoc)); 1188 if (!Method) { 1189 if (const ObjCMethodDecl *OM = SelectorsForTypoCorrection(Sel)) { 1190 Selector MatchedSel = OM->getSelector(); 1191 SourceRange SelectorRange(LParenLoc.getLocWithOffset(1), 1192 RParenLoc.getLocWithOffset(-1)); 1193 Diag(SelLoc, diag::warn_undeclared_selector_with_typo) 1194 << Sel << MatchedSel 1195 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString()); 1196 1197 } else 1198 Diag(SelLoc, diag::warn_undeclared_selector) << Sel; 1199 } else 1200 DiagnoseMismatchedSelectors(*this, AtLoc, Method, LParenLoc, RParenLoc, 1201 WarnMultipleSelectors); 1202 1203 if (Method && 1204 Method->getImplementationControl() != ObjCMethodDecl::Optional && 1205 !getSourceManager().isInSystemHeader(Method->getLocation())) 1206 ReferencedSelectors.insert(std::make_pair(Sel, AtLoc)); 1207 1208 // In ARC, forbid the user from using @selector for 1209 // retain/release/autorelease/dealloc/retainCount. 1210 if (getLangOpts().ObjCAutoRefCount) { 1211 switch (Sel.getMethodFamily()) { 1212 case OMF_retain: 1213 case OMF_release: 1214 case OMF_autorelease: 1215 case OMF_retainCount: 1216 case OMF_dealloc: 1217 Diag(AtLoc, diag::err_arc_illegal_selector) << 1218 Sel << SourceRange(LParenLoc, RParenLoc); 1219 break; 1220 1221 case OMF_None: 1222 case OMF_alloc: 1223 case OMF_copy: 1224 case OMF_finalize: 1225 case OMF_init: 1226 case OMF_mutableCopy: 1227 case OMF_new: 1228 case OMF_self: 1229 case OMF_initialize: 1230 case OMF_performSelector: 1231 break; 1232 } 1233 } 1234 QualType Ty = Context.getObjCSelType(); 1235 return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc); 1236 } 1237 1238 ExprResult Sema::ParseObjCProtocolExpression(IdentifierInfo *ProtocolId, 1239 SourceLocation AtLoc, 1240 SourceLocation ProtoLoc, 1241 SourceLocation LParenLoc, 1242 SourceLocation ProtoIdLoc, 1243 SourceLocation RParenLoc) { 1244 ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId, ProtoIdLoc); 1245 if (!PDecl) { 1246 Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId; 1247 return true; 1248 } 1249 if (!PDecl->hasDefinition()) { 1250 Diag(ProtoLoc, diag::err_atprotocol_protocol) << PDecl; 1251 Diag(PDecl->getLocation(), diag::note_entity_declared_at) << PDecl; 1252 } else { 1253 PDecl = PDecl->getDefinition(); 1254 } 1255 1256 QualType Ty = Context.getObjCProtoType(); 1257 if (Ty.isNull()) 1258 return true; 1259 Ty = Context.getObjCObjectPointerType(Ty); 1260 return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, ProtoIdLoc, RParenLoc); 1261 } 1262 1263 /// Try to capture an implicit reference to 'self'. 1264 ObjCMethodDecl *Sema::tryCaptureObjCSelf(SourceLocation Loc) { 1265 DeclContext *DC = getFunctionLevelDeclContext(); 1266 1267 // If we're not in an ObjC method, error out. Note that, unlike the 1268 // C++ case, we don't require an instance method --- class methods 1269 // still have a 'self', and we really do still need to capture it! 1270 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(DC); 1271 if (!method) 1272 return nullptr; 1273 1274 tryCaptureVariable(method->getSelfDecl(), Loc); 1275 1276 return method; 1277 } 1278 1279 static QualType stripObjCInstanceType(ASTContext &Context, QualType T) { 1280 QualType origType = T; 1281 if (auto nullability = AttributedType::stripOuterNullability(T)) { 1282 if (T == Context.getObjCInstanceType()) { 1283 return Context.getAttributedType( 1284 AttributedType::getNullabilityAttrKind(*nullability), 1285 Context.getObjCIdType(), 1286 Context.getObjCIdType()); 1287 } 1288 1289 return origType; 1290 } 1291 1292 if (T == Context.getObjCInstanceType()) 1293 return Context.getObjCIdType(); 1294 1295 return origType; 1296 } 1297 1298 /// Determine the result type of a message send based on the receiver type, 1299 /// method, and the kind of message send. 1300 /// 1301 /// This is the "base" result type, which will still need to be adjusted 1302 /// to account for nullability. 1303 static QualType getBaseMessageSendResultType(Sema &S, 1304 QualType ReceiverType, 1305 ObjCMethodDecl *Method, 1306 bool isClassMessage, 1307 bool isSuperMessage) { 1308 assert(Method && "Must have a method"); 1309 if (!Method->hasRelatedResultType()) 1310 return Method->getSendResultType(ReceiverType); 1311 1312 ASTContext &Context = S.Context; 1313 1314 // Local function that transfers the nullability of the method's 1315 // result type to the returned result. 1316 auto transferNullability = [&](QualType type) -> QualType { 1317 // If the method's result type has nullability, extract it. 1318 if (auto nullability = Method->getSendResultType(ReceiverType) 1319 ->getNullability(Context)){ 1320 // Strip off any outer nullability sugar from the provided type. 1321 (void)AttributedType::stripOuterNullability(type); 1322 1323 // Form a new attributed type using the method result type's nullability. 1324 return Context.getAttributedType( 1325 AttributedType::getNullabilityAttrKind(*nullability), 1326 type, 1327 type); 1328 } 1329 1330 return type; 1331 }; 1332 1333 // If a method has a related return type: 1334 // - if the method found is an instance method, but the message send 1335 // was a class message send, T is the declared return type of the method 1336 // found 1337 if (Method->isInstanceMethod() && isClassMessage) 1338 return stripObjCInstanceType(Context, 1339 Method->getSendResultType(ReceiverType)); 1340 1341 // - if the receiver is super, T is a pointer to the class of the 1342 // enclosing method definition 1343 if (isSuperMessage) { 1344 if (ObjCMethodDecl *CurMethod = S.getCurMethodDecl()) 1345 if (ObjCInterfaceDecl *Class = CurMethod->getClassInterface()) { 1346 return transferNullability( 1347 Context.getObjCObjectPointerType( 1348 Context.getObjCInterfaceType(Class))); 1349 } 1350 } 1351 1352 // - if the receiver is the name of a class U, T is a pointer to U 1353 if (ReceiverType->getAsObjCInterfaceType()) 1354 return transferNullability(Context.getObjCObjectPointerType(ReceiverType)); 1355 // - if the receiver is of type Class or qualified Class type, 1356 // T is the declared return type of the method. 1357 if (ReceiverType->isObjCClassType() || 1358 ReceiverType->isObjCQualifiedClassType()) 1359 return stripObjCInstanceType(Context, 1360 Method->getSendResultType(ReceiverType)); 1361 1362 // - if the receiver is id, qualified id, Class, or qualified Class, T 1363 // is the receiver type, otherwise 1364 // - T is the type of the receiver expression. 1365 return transferNullability(ReceiverType); 1366 } 1367 1368 QualType Sema::getMessageSendResultType(const Expr *Receiver, 1369 QualType ReceiverType, 1370 ObjCMethodDecl *Method, 1371 bool isClassMessage, 1372 bool isSuperMessage) { 1373 // Produce the result type. 1374 QualType resultType = getBaseMessageSendResultType(*this, ReceiverType, 1375 Method, 1376 isClassMessage, 1377 isSuperMessage); 1378 1379 // If this is a class message, ignore the nullability of the receiver. 1380 if (isClassMessage) { 1381 // In a class method, class messages to 'self' that return instancetype can 1382 // be typed as the current class. We can safely do this in ARC because self 1383 // can't be reassigned, and we do it unsafely outside of ARC because in 1384 // practice people never reassign self in class methods and there's some 1385 // virtue in not being aggressively pedantic. 1386 if (Receiver && Receiver->isObjCSelfExpr()) { 1387 assert(ReceiverType->isObjCClassType() && "expected a Class self"); 1388 QualType T = Method->getSendResultType(ReceiverType); 1389 AttributedType::stripOuterNullability(T); 1390 if (T == Context.getObjCInstanceType()) { 1391 const ObjCMethodDecl *MD = cast<ObjCMethodDecl>( 1392 cast<ImplicitParamDecl>( 1393 cast<DeclRefExpr>(Receiver->IgnoreParenImpCasts())->getDecl()) 1394 ->getDeclContext()); 1395 assert(MD->isClassMethod() && "expected a class method"); 1396 QualType NewResultType = Context.getObjCObjectPointerType( 1397 Context.getObjCInterfaceType(MD->getClassInterface())); 1398 if (auto Nullability = resultType->getNullability(Context)) 1399 NewResultType = Context.getAttributedType( 1400 AttributedType::getNullabilityAttrKind(*Nullability), 1401 NewResultType, NewResultType); 1402 return NewResultType; 1403 } 1404 } 1405 return resultType; 1406 } 1407 1408 // There is nothing left to do if the result type cannot have a nullability 1409 // specifier. 1410 if (!resultType->canHaveNullability()) 1411 return resultType; 1412 1413 // Map the nullability of the result into a table index. 1414 unsigned receiverNullabilityIdx = 0; 1415 if (auto nullability = ReceiverType->getNullability(Context)) 1416 receiverNullabilityIdx = 1 + static_cast<unsigned>(*nullability); 1417 1418 unsigned resultNullabilityIdx = 0; 1419 if (auto nullability = resultType->getNullability(Context)) 1420 resultNullabilityIdx = 1 + static_cast<unsigned>(*nullability); 1421 1422 // The table of nullability mappings, indexed by the receiver's nullability 1423 // and then the result type's nullability. 1424 static const uint8_t None = 0; 1425 static const uint8_t NonNull = 1; 1426 static const uint8_t Nullable = 2; 1427 static const uint8_t Unspecified = 3; 1428 static const uint8_t nullabilityMap[4][4] = { 1429 // None NonNull Nullable Unspecified 1430 /* None */ { None, None, Nullable, None }, 1431 /* NonNull */ { None, NonNull, Nullable, Unspecified }, 1432 /* Nullable */ { Nullable, Nullable, Nullable, Nullable }, 1433 /* Unspecified */ { None, Unspecified, Nullable, Unspecified } 1434 }; 1435 1436 unsigned newResultNullabilityIdx 1437 = nullabilityMap[receiverNullabilityIdx][resultNullabilityIdx]; 1438 if (newResultNullabilityIdx == resultNullabilityIdx) 1439 return resultType; 1440 1441 // Strip off the existing nullability. This removes as little type sugar as 1442 // possible. 1443 do { 1444 if (auto attributed = dyn_cast<AttributedType>(resultType.getTypePtr())) { 1445 resultType = attributed->getModifiedType(); 1446 } else { 1447 resultType = resultType.getDesugaredType(Context); 1448 } 1449 } while (resultType->getNullability(Context)); 1450 1451 // Add nullability back if needed. 1452 if (newResultNullabilityIdx > 0) { 1453 auto newNullability 1454 = static_cast<NullabilityKind>(newResultNullabilityIdx-1); 1455 return Context.getAttributedType( 1456 AttributedType::getNullabilityAttrKind(newNullability), 1457 resultType, resultType); 1458 } 1459 1460 return resultType; 1461 } 1462 1463 /// Look for an ObjC method whose result type exactly matches the given type. 1464 static const ObjCMethodDecl * 1465 findExplicitInstancetypeDeclarer(const ObjCMethodDecl *MD, 1466 QualType instancetype) { 1467 if (MD->getReturnType() == instancetype) 1468 return MD; 1469 1470 // For these purposes, a method in an @implementation overrides a 1471 // declaration in the @interface. 1472 if (const ObjCImplDecl *impl = 1473 dyn_cast<ObjCImplDecl>(MD->getDeclContext())) { 1474 const ObjCContainerDecl *iface; 1475 if (const ObjCCategoryImplDecl *catImpl = 1476 dyn_cast<ObjCCategoryImplDecl>(impl)) { 1477 iface = catImpl->getCategoryDecl(); 1478 } else { 1479 iface = impl->getClassInterface(); 1480 } 1481 1482 const ObjCMethodDecl *ifaceMD = 1483 iface->getMethod(MD->getSelector(), MD->isInstanceMethod()); 1484 if (ifaceMD) return findExplicitInstancetypeDeclarer(ifaceMD, instancetype); 1485 } 1486 1487 SmallVector<const ObjCMethodDecl *, 4> overrides; 1488 MD->getOverriddenMethods(overrides); 1489 for (unsigned i = 0, e = overrides.size(); i != e; ++i) { 1490 if (const ObjCMethodDecl *result = 1491 findExplicitInstancetypeDeclarer(overrides[i], instancetype)) 1492 return result; 1493 } 1494 1495 return nullptr; 1496 } 1497 1498 void Sema::EmitRelatedResultTypeNoteForReturn(QualType destType) { 1499 // Only complain if we're in an ObjC method and the required return 1500 // type doesn't match the method's declared return type. 1501 ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(CurContext); 1502 if (!MD || !MD->hasRelatedResultType() || 1503 Context.hasSameUnqualifiedType(destType, MD->getReturnType())) 1504 return; 1505 1506 // Look for a method overridden by this method which explicitly uses 1507 // 'instancetype'. 1508 if (const ObjCMethodDecl *overridden = 1509 findExplicitInstancetypeDeclarer(MD, Context.getObjCInstanceType())) { 1510 SourceRange range = overridden->getReturnTypeSourceRange(); 1511 SourceLocation loc = range.getBegin(); 1512 if (loc.isInvalid()) 1513 loc = overridden->getLocation(); 1514 Diag(loc, diag::note_related_result_type_explicit) 1515 << /*current method*/ 1 << range; 1516 return; 1517 } 1518 1519 // Otherwise, if we have an interesting method family, note that. 1520 // This should always trigger if the above didn't. 1521 if (ObjCMethodFamily family = MD->getMethodFamily()) 1522 Diag(MD->getLocation(), diag::note_related_result_type_family) 1523 << /*current method*/ 1 1524 << family; 1525 } 1526 1527 void Sema::EmitRelatedResultTypeNote(const Expr *E) { 1528 E = E->IgnoreParenImpCasts(); 1529 const ObjCMessageExpr *MsgSend = dyn_cast<ObjCMessageExpr>(E); 1530 if (!MsgSend) 1531 return; 1532 1533 const ObjCMethodDecl *Method = MsgSend->getMethodDecl(); 1534 if (!Method) 1535 return; 1536 1537 if (!Method->hasRelatedResultType()) 1538 return; 1539 1540 if (Context.hasSameUnqualifiedType( 1541 Method->getReturnType().getNonReferenceType(), MsgSend->getType())) 1542 return; 1543 1544 if (!Context.hasSameUnqualifiedType(Method->getReturnType(), 1545 Context.getObjCInstanceType())) 1546 return; 1547 1548 Diag(Method->getLocation(), diag::note_related_result_type_inferred) 1549 << Method->isInstanceMethod() << Method->getSelector() 1550 << MsgSend->getType(); 1551 } 1552 1553 bool Sema::CheckMessageArgumentTypes( 1554 const Expr *Receiver, QualType ReceiverType, MultiExprArg Args, 1555 Selector Sel, ArrayRef<SourceLocation> SelectorLocs, ObjCMethodDecl *Method, 1556 bool isClassMessage, bool isSuperMessage, SourceLocation lbrac, 1557 SourceLocation rbrac, SourceRange RecRange, QualType &ReturnType, 1558 ExprValueKind &VK) { 1559 SourceLocation SelLoc; 1560 if (!SelectorLocs.empty() && SelectorLocs.front().isValid()) 1561 SelLoc = SelectorLocs.front(); 1562 else 1563 SelLoc = lbrac; 1564 1565 if (!Method) { 1566 // Apply default argument promotion as for (C99 6.5.2.2p6). 1567 for (unsigned i = 0, e = Args.size(); i != e; i++) { 1568 if (Args[i]->isTypeDependent()) 1569 continue; 1570 1571 ExprResult result; 1572 if (getLangOpts().DebuggerSupport) { 1573 QualType paramTy; // ignored 1574 result = checkUnknownAnyArg(SelLoc, Args[i], paramTy); 1575 } else { 1576 result = DefaultArgumentPromotion(Args[i]); 1577 } 1578 if (result.isInvalid()) 1579 return true; 1580 Args[i] = result.get(); 1581 } 1582 1583 unsigned DiagID; 1584 if (getLangOpts().ObjCAutoRefCount) 1585 DiagID = diag::err_arc_method_not_found; 1586 else 1587 DiagID = isClassMessage ? diag::warn_class_method_not_found 1588 : diag::warn_inst_method_not_found; 1589 if (!getLangOpts().DebuggerSupport) { 1590 const ObjCMethodDecl *OMD = SelectorsForTypoCorrection(Sel, ReceiverType); 1591 if (OMD && !OMD->isInvalidDecl()) { 1592 if (getLangOpts().ObjCAutoRefCount) 1593 DiagID = diag::err_method_not_found_with_typo; 1594 else 1595 DiagID = isClassMessage ? diag::warn_class_method_not_found_with_typo 1596 : diag::warn_instance_method_not_found_with_typo; 1597 Selector MatchedSel = OMD->getSelector(); 1598 SourceRange SelectorRange(SelectorLocs.front(), SelectorLocs.back()); 1599 if (MatchedSel.isUnarySelector()) 1600 Diag(SelLoc, DiagID) 1601 << Sel<< isClassMessage << MatchedSel 1602 << FixItHint::CreateReplacement(SelectorRange, MatchedSel.getAsString()); 1603 else 1604 Diag(SelLoc, DiagID) << Sel<< isClassMessage << MatchedSel; 1605 } 1606 else 1607 Diag(SelLoc, DiagID) 1608 << Sel << isClassMessage << SourceRange(SelectorLocs.front(), 1609 SelectorLocs.back()); 1610 // Find the class to which we are sending this message. 1611 if (ReceiverType->isObjCObjectPointerType()) { 1612 if (ObjCInterfaceDecl *ThisClass = 1613 ReceiverType->getAs<ObjCObjectPointerType>()->getInterfaceDecl()) { 1614 Diag(ThisClass->getLocation(), diag::note_receiver_class_declared); 1615 if (!RecRange.isInvalid()) 1616 if (ThisClass->lookupClassMethod(Sel)) 1617 Diag(RecRange.getBegin(),diag::note_receiver_expr_here) 1618 << FixItHint::CreateReplacement(RecRange, 1619 ThisClass->getNameAsString()); 1620 } 1621 } 1622 } 1623 1624 // In debuggers, we want to use __unknown_anytype for these 1625 // results so that clients can cast them. 1626 if (getLangOpts().DebuggerSupport) { 1627 ReturnType = Context.UnknownAnyTy; 1628 } else { 1629 ReturnType = Context.getObjCIdType(); 1630 } 1631 VK = VK_RValue; 1632 return false; 1633 } 1634 1635 ReturnType = getMessageSendResultType(Receiver, ReceiverType, Method, 1636 isClassMessage, isSuperMessage); 1637 VK = Expr::getValueKindForType(Method->getReturnType()); 1638 1639 unsigned NumNamedArgs = Sel.getNumArgs(); 1640 // Method might have more arguments than selector indicates. This is due 1641 // to addition of c-style arguments in method. 1642 if (Method->param_size() > Sel.getNumArgs()) 1643 NumNamedArgs = Method->param_size(); 1644 // FIXME. This need be cleaned up. 1645 if (Args.size() < NumNamedArgs) { 1646 Diag(SelLoc, diag::err_typecheck_call_too_few_args) 1647 << 2 << NumNamedArgs << static_cast<unsigned>(Args.size()); 1648 return false; 1649 } 1650 1651 // Compute the set of type arguments to be substituted into each parameter 1652 // type. 1653 Optional<ArrayRef<QualType>> typeArgs 1654 = ReceiverType->getObjCSubstitutions(Method->getDeclContext()); 1655 bool IsError = false; 1656 for (unsigned i = 0; i < NumNamedArgs; i++) { 1657 // We can't do any type-checking on a type-dependent argument. 1658 if (Args[i]->isTypeDependent()) 1659 continue; 1660 1661 Expr *argExpr = Args[i]; 1662 1663 ParmVarDecl *param = Method->parameters()[i]; 1664 assert(argExpr && "CheckMessageArgumentTypes(): missing expression"); 1665 1666 if (param->hasAttr<NoEscapeAttr>()) 1667 if (auto *BE = dyn_cast<BlockExpr>( 1668 argExpr->IgnoreParenNoopCasts(Context))) 1669 BE->getBlockDecl()->setDoesNotEscape(); 1670 1671 // Strip the unbridged-cast placeholder expression off unless it's 1672 // a consumed argument. 1673 if (argExpr->hasPlaceholderType(BuiltinType::ARCUnbridgedCast) && 1674 !param->hasAttr<CFConsumedAttr>()) 1675 argExpr = stripARCUnbridgedCast(argExpr); 1676 1677 // If the parameter is __unknown_anytype, infer its type 1678 // from the argument. 1679 if (param->getType() == Context.UnknownAnyTy) { 1680 QualType paramType; 1681 ExprResult argE = checkUnknownAnyArg(SelLoc, argExpr, paramType); 1682 if (argE.isInvalid()) { 1683 IsError = true; 1684 } else { 1685 Args[i] = argE.get(); 1686 1687 // Update the parameter type in-place. 1688 param->setType(paramType); 1689 } 1690 continue; 1691 } 1692 1693 QualType origParamType = param->getType(); 1694 QualType paramType = param->getType(); 1695 if (typeArgs) 1696 paramType = paramType.substObjCTypeArgs( 1697 Context, 1698 *typeArgs, 1699 ObjCSubstitutionContext::Parameter); 1700 1701 if (RequireCompleteType(argExpr->getSourceRange().getBegin(), 1702 paramType, 1703 diag::err_call_incomplete_argument, argExpr)) 1704 return true; 1705 1706 InitializedEntity Entity 1707 = InitializedEntity::InitializeParameter(Context, param, paramType); 1708 ExprResult ArgE = PerformCopyInitialization(Entity, SourceLocation(), argExpr); 1709 if (ArgE.isInvalid()) 1710 IsError = true; 1711 else { 1712 Args[i] = ArgE.getAs<Expr>(); 1713 1714 // If we are type-erasing a block to a block-compatible 1715 // Objective-C pointer type, we may need to extend the lifetime 1716 // of the block object. 1717 if (typeArgs && Args[i]->isRValue() && paramType->isBlockPointerType() && 1718 Args[i]->getType()->isBlockPointerType() && 1719 origParamType->isObjCObjectPointerType()) { 1720 ExprResult arg = Args[i]; 1721 maybeExtendBlockObject(arg); 1722 Args[i] = arg.get(); 1723 } 1724 } 1725 } 1726 1727 // Promote additional arguments to variadic methods. 1728 if (Method->isVariadic()) { 1729 for (unsigned i = NumNamedArgs, e = Args.size(); i < e; ++i) { 1730 if (Args[i]->isTypeDependent()) 1731 continue; 1732 1733 ExprResult Arg = DefaultVariadicArgumentPromotion(Args[i], VariadicMethod, 1734 nullptr); 1735 IsError |= Arg.isInvalid(); 1736 Args[i] = Arg.get(); 1737 } 1738 } else { 1739 // Check for extra arguments to non-variadic methods. 1740 if (Args.size() != NumNamedArgs) { 1741 Diag(Args[NumNamedArgs]->getBeginLoc(), 1742 diag::err_typecheck_call_too_many_args) 1743 << 2 /*method*/ << NumNamedArgs << static_cast<unsigned>(Args.size()) 1744 << Method->getSourceRange() 1745 << SourceRange(Args[NumNamedArgs]->getBeginLoc(), 1746 Args.back()->getEndLoc()); 1747 } 1748 } 1749 1750 DiagnoseSentinelCalls(Method, SelLoc, Args); 1751 1752 // Do additional checkings on method. 1753 IsError |= CheckObjCMethodCall( 1754 Method, SelLoc, makeArrayRef(Args.data(), Args.size())); 1755 1756 return IsError; 1757 } 1758 1759 bool Sema::isSelfExpr(Expr *RExpr) { 1760 // 'self' is objc 'self' in an objc method only. 1761 ObjCMethodDecl *Method = 1762 dyn_cast_or_null<ObjCMethodDecl>(CurContext->getNonClosureAncestor()); 1763 return isSelfExpr(RExpr, Method); 1764 } 1765 1766 bool Sema::isSelfExpr(Expr *receiver, const ObjCMethodDecl *method) { 1767 if (!method) return false; 1768 1769 receiver = receiver->IgnoreParenLValueCasts(); 1770 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(receiver)) 1771 if (DRE->getDecl() == method->getSelfDecl()) 1772 return true; 1773 return false; 1774 } 1775 1776 /// LookupMethodInType - Look up a method in an ObjCObjectType. 1777 ObjCMethodDecl *Sema::LookupMethodInObjectType(Selector sel, QualType type, 1778 bool isInstance) { 1779 const ObjCObjectType *objType = type->castAs<ObjCObjectType>(); 1780 if (ObjCInterfaceDecl *iface = objType->getInterface()) { 1781 // Look it up in the main interface (and categories, etc.) 1782 if (ObjCMethodDecl *method = iface->lookupMethod(sel, isInstance)) 1783 return method; 1784 1785 // Okay, look for "private" methods declared in any 1786 // @implementations we've seen. 1787 if (ObjCMethodDecl *method = iface->lookupPrivateMethod(sel, isInstance)) 1788 return method; 1789 } 1790 1791 // Check qualifiers. 1792 for (const auto *I : objType->quals()) 1793 if (ObjCMethodDecl *method = I->lookupMethod(sel, isInstance)) 1794 return method; 1795 1796 return nullptr; 1797 } 1798 1799 /// LookupMethodInQualifiedType - Lookups up a method in protocol qualifier 1800 /// list of a qualified objective pointer type. 1801 ObjCMethodDecl *Sema::LookupMethodInQualifiedType(Selector Sel, 1802 const ObjCObjectPointerType *OPT, 1803 bool Instance) 1804 { 1805 ObjCMethodDecl *MD = nullptr; 1806 for (const auto *PROTO : OPT->quals()) { 1807 if ((MD = PROTO->lookupMethod(Sel, Instance))) { 1808 return MD; 1809 } 1810 } 1811 return nullptr; 1812 } 1813 1814 /// HandleExprPropertyRefExpr - Handle foo.bar where foo is a pointer to an 1815 /// objective C interface. This is a property reference expression. 1816 ExprResult Sema:: 1817 HandleExprPropertyRefExpr(const ObjCObjectPointerType *OPT, 1818 Expr *BaseExpr, SourceLocation OpLoc, 1819 DeclarationName MemberName, 1820 SourceLocation MemberLoc, 1821 SourceLocation SuperLoc, QualType SuperType, 1822 bool Super) { 1823 const ObjCInterfaceType *IFaceT = OPT->getInterfaceType(); 1824 ObjCInterfaceDecl *IFace = IFaceT->getDecl(); 1825 1826 if (!MemberName.isIdentifier()) { 1827 Diag(MemberLoc, diag::err_invalid_property_name) 1828 << MemberName << QualType(OPT, 0); 1829 return ExprError(); 1830 } 1831 1832 IdentifierInfo *Member = MemberName.getAsIdentifierInfo(); 1833 1834 SourceRange BaseRange = Super? SourceRange(SuperLoc) 1835 : BaseExpr->getSourceRange(); 1836 if (RequireCompleteType(MemberLoc, OPT->getPointeeType(), 1837 diag::err_property_not_found_forward_class, 1838 MemberName, BaseRange)) 1839 return ExprError(); 1840 1841 if (ObjCPropertyDecl *PD = IFace->FindPropertyDeclaration( 1842 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) { 1843 // Check whether we can reference this property. 1844 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1845 return ExprError(); 1846 if (Super) 1847 return new (Context) 1848 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue, 1849 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType); 1850 else 1851 return new (Context) 1852 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue, 1853 OK_ObjCProperty, MemberLoc, BaseExpr); 1854 } 1855 // Check protocols on qualified interfaces. 1856 for (const auto *I : OPT->quals()) 1857 if (ObjCPropertyDecl *PD = I->FindPropertyDeclaration( 1858 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) { 1859 // Check whether we can reference this property. 1860 if (DiagnoseUseOfDecl(PD, MemberLoc)) 1861 return ExprError(); 1862 1863 if (Super) 1864 return new (Context) ObjCPropertyRefExpr( 1865 PD, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty, MemberLoc, 1866 SuperLoc, SuperType); 1867 else 1868 return new (Context) 1869 ObjCPropertyRefExpr(PD, Context.PseudoObjectTy, VK_LValue, 1870 OK_ObjCProperty, MemberLoc, BaseExpr); 1871 } 1872 // If that failed, look for an "implicit" property by seeing if the nullary 1873 // selector is implemented. 1874 1875 // FIXME: The logic for looking up nullary and unary selectors should be 1876 // shared with the code in ActOnInstanceMessage. 1877 1878 Selector Sel = PP.getSelectorTable().getNullarySelector(Member); 1879 ObjCMethodDecl *Getter = IFace->lookupInstanceMethod(Sel); 1880 1881 // May be found in property's qualified list. 1882 if (!Getter) 1883 Getter = LookupMethodInQualifiedType(Sel, OPT, true); 1884 1885 // If this reference is in an @implementation, check for 'private' methods. 1886 if (!Getter) 1887 Getter = IFace->lookupPrivateMethod(Sel); 1888 1889 if (Getter) { 1890 // Check if we can reference this property. 1891 if (DiagnoseUseOfDecl(Getter, MemberLoc)) 1892 return ExprError(); 1893 } 1894 // If we found a getter then this may be a valid dot-reference, we 1895 // will look for the matching setter, in case it is needed. 1896 Selector SetterSel = 1897 SelectorTable::constructSetterSelector(PP.getIdentifierTable(), 1898 PP.getSelectorTable(), Member); 1899 ObjCMethodDecl *Setter = IFace->lookupInstanceMethod(SetterSel); 1900 1901 // May be found in property's qualified list. 1902 if (!Setter) 1903 Setter = LookupMethodInQualifiedType(SetterSel, OPT, true); 1904 1905 if (!Setter) { 1906 // If this reference is in an @implementation, also check for 'private' 1907 // methods. 1908 Setter = IFace->lookupPrivateMethod(SetterSel); 1909 } 1910 1911 if (Setter && DiagnoseUseOfDecl(Setter, MemberLoc)) 1912 return ExprError(); 1913 1914 // Special warning if member name used in a property-dot for a setter accessor 1915 // does not use a property with same name; e.g. obj.X = ... for a property with 1916 // name 'x'. 1917 if (Setter && Setter->isImplicit() && Setter->isPropertyAccessor() && 1918 !IFace->FindPropertyDeclaration( 1919 Member, ObjCPropertyQueryKind::OBJC_PR_query_instance)) { 1920 if (const ObjCPropertyDecl *PDecl = Setter->findPropertyDecl()) { 1921 // Do not warn if user is using property-dot syntax to make call to 1922 // user named setter. 1923 if (!(PDecl->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_setter)) 1924 Diag(MemberLoc, 1925 diag::warn_property_access_suggest) 1926 << MemberName << QualType(OPT, 0) << PDecl->getName() 1927 << FixItHint::CreateReplacement(MemberLoc, PDecl->getName()); 1928 } 1929 } 1930 1931 if (Getter || Setter) { 1932 if (Super) 1933 return new (Context) 1934 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue, 1935 OK_ObjCProperty, MemberLoc, SuperLoc, SuperType); 1936 else 1937 return new (Context) 1938 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue, 1939 OK_ObjCProperty, MemberLoc, BaseExpr); 1940 1941 } 1942 1943 // Attempt to correct for typos in property names. 1944 DeclFilterCCC<ObjCPropertyDecl> CCC{}; 1945 if (TypoCorrection Corrected = CorrectTypo( 1946 DeclarationNameInfo(MemberName, MemberLoc), LookupOrdinaryName, 1947 nullptr, nullptr, CCC, CTK_ErrorRecovery, IFace, false, OPT)) { 1948 DeclarationName TypoResult = Corrected.getCorrection(); 1949 if (TypoResult.isIdentifier() && 1950 TypoResult.getAsIdentifierInfo() == Member) { 1951 // There is no need to try the correction if it is the same. 1952 NamedDecl *ChosenDecl = 1953 Corrected.isKeyword() ? nullptr : Corrected.getFoundDecl(); 1954 if (ChosenDecl && isa<ObjCPropertyDecl>(ChosenDecl)) 1955 if (cast<ObjCPropertyDecl>(ChosenDecl)->isClassProperty()) { 1956 // This is a class property, we should not use the instance to 1957 // access it. 1958 Diag(MemberLoc, diag::err_class_property_found) << MemberName 1959 << OPT->getInterfaceDecl()->getName() 1960 << FixItHint::CreateReplacement(BaseExpr->getSourceRange(), 1961 OPT->getInterfaceDecl()->getName()); 1962 return ExprError(); 1963 } 1964 } else { 1965 diagnoseTypo(Corrected, PDiag(diag::err_property_not_found_suggest) 1966 << MemberName << QualType(OPT, 0)); 1967 return HandleExprPropertyRefExpr(OPT, BaseExpr, OpLoc, 1968 TypoResult, MemberLoc, 1969 SuperLoc, SuperType, Super); 1970 } 1971 } 1972 ObjCInterfaceDecl *ClassDeclared; 1973 if (ObjCIvarDecl *Ivar = 1974 IFace->lookupInstanceVariable(Member, ClassDeclared)) { 1975 QualType T = Ivar->getType(); 1976 if (const ObjCObjectPointerType * OBJPT = 1977 T->getAsObjCInterfacePointerType()) { 1978 if (RequireCompleteType(MemberLoc, OBJPT->getPointeeType(), 1979 diag::err_property_not_as_forward_class, 1980 MemberName, BaseExpr)) 1981 return ExprError(); 1982 } 1983 Diag(MemberLoc, 1984 diag::err_ivar_access_using_property_syntax_suggest) 1985 << MemberName << QualType(OPT, 0) << Ivar->getDeclName() 1986 << FixItHint::CreateReplacement(OpLoc, "->"); 1987 return ExprError(); 1988 } 1989 1990 Diag(MemberLoc, diag::err_property_not_found) 1991 << MemberName << QualType(OPT, 0); 1992 if (Setter) 1993 Diag(Setter->getLocation(), diag::note_getter_unavailable) 1994 << MemberName << BaseExpr->getSourceRange(); 1995 return ExprError(); 1996 } 1997 1998 ExprResult Sema:: 1999 ActOnClassPropertyRefExpr(IdentifierInfo &receiverName, 2000 IdentifierInfo &propertyName, 2001 SourceLocation receiverNameLoc, 2002 SourceLocation propertyNameLoc) { 2003 2004 IdentifierInfo *receiverNamePtr = &receiverName; 2005 ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr, 2006 receiverNameLoc); 2007 2008 QualType SuperType; 2009 if (!IFace) { 2010 // If the "receiver" is 'super' in a method, handle it as an expression-like 2011 // property reference. 2012 if (receiverNamePtr->isStr("super")) { 2013 if (ObjCMethodDecl *CurMethod = tryCaptureObjCSelf(receiverNameLoc)) { 2014 if (auto classDecl = CurMethod->getClassInterface()) { 2015 SuperType = QualType(classDecl->getSuperClassType(), 0); 2016 if (CurMethod->isInstanceMethod()) { 2017 if (SuperType.isNull()) { 2018 // The current class does not have a superclass. 2019 Diag(receiverNameLoc, diag::err_root_class_cannot_use_super) 2020 << CurMethod->getClassInterface()->getIdentifier(); 2021 return ExprError(); 2022 } 2023 QualType T = Context.getObjCObjectPointerType(SuperType); 2024 2025 return HandleExprPropertyRefExpr(T->castAs<ObjCObjectPointerType>(), 2026 /*BaseExpr*/nullptr, 2027 SourceLocation()/*OpLoc*/, 2028 &propertyName, 2029 propertyNameLoc, 2030 receiverNameLoc, T, true); 2031 } 2032 2033 // Otherwise, if this is a class method, try dispatching to our 2034 // superclass. 2035 IFace = CurMethod->getClassInterface()->getSuperClass(); 2036 } 2037 } 2038 } 2039 2040 if (!IFace) { 2041 Diag(receiverNameLoc, diag::err_expected_either) << tok::identifier 2042 << tok::l_paren; 2043 return ExprError(); 2044 } 2045 } 2046 2047 Selector GetterSel; 2048 Selector SetterSel; 2049 if (auto PD = IFace->FindPropertyDeclaration( 2050 &propertyName, ObjCPropertyQueryKind::OBJC_PR_query_class)) { 2051 GetterSel = PD->getGetterName(); 2052 SetterSel = PD->getSetterName(); 2053 } else { 2054 GetterSel = PP.getSelectorTable().getNullarySelector(&propertyName); 2055 SetterSel = SelectorTable::constructSetterSelector( 2056 PP.getIdentifierTable(), PP.getSelectorTable(), &propertyName); 2057 } 2058 2059 // Search for a declared property first. 2060 ObjCMethodDecl *Getter = IFace->lookupClassMethod(GetterSel); 2061 2062 // If this reference is in an @implementation, check for 'private' methods. 2063 if (!Getter) 2064 Getter = IFace->lookupPrivateClassMethod(GetterSel); 2065 2066 if (Getter) { 2067 // FIXME: refactor/share with ActOnMemberReference(). 2068 // Check if we can reference this property. 2069 if (DiagnoseUseOfDecl(Getter, propertyNameLoc)) 2070 return ExprError(); 2071 } 2072 2073 // Look for the matching setter, in case it is needed. 2074 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); 2075 if (!Setter) { 2076 // If this reference is in an @implementation, also check for 'private' 2077 // methods. 2078 Setter = IFace->lookupPrivateClassMethod(SetterSel); 2079 } 2080 // Look through local category implementations associated with the class. 2081 if (!Setter) 2082 Setter = IFace->getCategoryClassMethod(SetterSel); 2083 2084 if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc)) 2085 return ExprError(); 2086 2087 if (Getter || Setter) { 2088 if (!SuperType.isNull()) 2089 return new (Context) 2090 ObjCPropertyRefExpr(Getter, Setter, Context.PseudoObjectTy, VK_LValue, 2091 OK_ObjCProperty, propertyNameLoc, receiverNameLoc, 2092 SuperType); 2093 2094 return new (Context) ObjCPropertyRefExpr( 2095 Getter, Setter, Context.PseudoObjectTy, VK_LValue, OK_ObjCProperty, 2096 propertyNameLoc, receiverNameLoc, IFace); 2097 } 2098 return ExprError(Diag(propertyNameLoc, diag::err_property_not_found) 2099 << &propertyName << Context.getObjCInterfaceType(IFace)); 2100 } 2101 2102 namespace { 2103 2104 class ObjCInterfaceOrSuperCCC final : public CorrectionCandidateCallback { 2105 public: 2106 ObjCInterfaceOrSuperCCC(ObjCMethodDecl *Method) { 2107 // Determine whether "super" is acceptable in the current context. 2108 if (Method && Method->getClassInterface()) 2109 WantObjCSuper = Method->getClassInterface()->getSuperClass(); 2110 } 2111 2112 bool ValidateCandidate(const TypoCorrection &candidate) override { 2113 return candidate.getCorrectionDeclAs<ObjCInterfaceDecl>() || 2114 candidate.isKeyword("super"); 2115 } 2116 2117 std::unique_ptr<CorrectionCandidateCallback> clone() override { 2118 return llvm::make_unique<ObjCInterfaceOrSuperCCC>(*this); 2119 } 2120 }; 2121 2122 } // end anonymous namespace 2123 2124 Sema::ObjCMessageKind Sema::getObjCMessageKind(Scope *S, 2125 IdentifierInfo *Name, 2126 SourceLocation NameLoc, 2127 bool IsSuper, 2128 bool HasTrailingDot, 2129 ParsedType &ReceiverType) { 2130 ReceiverType = nullptr; 2131 2132 // If the identifier is "super" and there is no trailing dot, we're 2133 // messaging super. If the identifier is "super" and there is a 2134 // trailing dot, it's an instance message. 2135 if (IsSuper && S->isInObjcMethodScope()) 2136 return HasTrailingDot? ObjCInstanceMessage : ObjCSuperMessage; 2137 2138 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 2139 LookupName(Result, S); 2140 2141 switch (Result.getResultKind()) { 2142 case LookupResult::NotFound: 2143 // Normal name lookup didn't find anything. If we're in an 2144 // Objective-C method, look for ivars. If we find one, we're done! 2145 // FIXME: This is a hack. Ivar lookup should be part of normal 2146 // lookup. 2147 if (ObjCMethodDecl *Method = getCurMethodDecl()) { 2148 if (!Method->getClassInterface()) { 2149 // Fall back: let the parser try to parse it as an instance message. 2150 return ObjCInstanceMessage; 2151 } 2152 2153 ObjCInterfaceDecl *ClassDeclared; 2154 if (Method->getClassInterface()->lookupInstanceVariable(Name, 2155 ClassDeclared)) 2156 return ObjCInstanceMessage; 2157 } 2158 2159 // Break out; we'll perform typo correction below. 2160 break; 2161 2162 case LookupResult::NotFoundInCurrentInstantiation: 2163 case LookupResult::FoundOverloaded: 2164 case LookupResult::FoundUnresolvedValue: 2165 case LookupResult::Ambiguous: 2166 Result.suppressDiagnostics(); 2167 return ObjCInstanceMessage; 2168 2169 case LookupResult::Found: { 2170 // If the identifier is a class or not, and there is a trailing dot, 2171 // it's an instance message. 2172 if (HasTrailingDot) 2173 return ObjCInstanceMessage; 2174 // We found something. If it's a type, then we have a class 2175 // message. Otherwise, it's an instance message. 2176 NamedDecl *ND = Result.getFoundDecl(); 2177 QualType T; 2178 if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(ND)) 2179 T = Context.getObjCInterfaceType(Class); 2180 else if (TypeDecl *Type = dyn_cast<TypeDecl>(ND)) { 2181 T = Context.getTypeDeclType(Type); 2182 DiagnoseUseOfDecl(Type, NameLoc); 2183 } 2184 else 2185 return ObjCInstanceMessage; 2186 2187 // We have a class message, and T is the type we're 2188 // messaging. Build source-location information for it. 2189 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc); 2190 ReceiverType = CreateParsedType(T, TSInfo); 2191 return ObjCClassMessage; 2192 } 2193 } 2194 2195 ObjCInterfaceOrSuperCCC CCC(getCurMethodDecl()); 2196 if (TypoCorrection Corrected = CorrectTypo( 2197 Result.getLookupNameInfo(), Result.getLookupKind(), S, nullptr, CCC, 2198 CTK_ErrorRecovery, nullptr, false, nullptr, false)) { 2199 if (Corrected.isKeyword()) { 2200 // If we've found the keyword "super" (the only keyword that would be 2201 // returned by CorrectTypo), this is a send to super. 2202 diagnoseTypo(Corrected, 2203 PDiag(diag::err_unknown_receiver_suggest) << Name); 2204 return ObjCSuperMessage; 2205 } else if (ObjCInterfaceDecl *Class = 2206 Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>()) { 2207 // If we found a declaration, correct when it refers to an Objective-C 2208 // class. 2209 diagnoseTypo(Corrected, 2210 PDiag(diag::err_unknown_receiver_suggest) << Name); 2211 QualType T = Context.getObjCInterfaceType(Class); 2212 TypeSourceInfo *TSInfo = Context.getTrivialTypeSourceInfo(T, NameLoc); 2213 ReceiverType = CreateParsedType(T, TSInfo); 2214 return ObjCClassMessage; 2215 } 2216 } 2217 2218 // Fall back: let the parser try to parse it as an instance message. 2219 return ObjCInstanceMessage; 2220 } 2221 2222 ExprResult Sema::ActOnSuperMessage(Scope *S, 2223 SourceLocation SuperLoc, 2224 Selector Sel, 2225 SourceLocation LBracLoc, 2226 ArrayRef<SourceLocation> SelectorLocs, 2227 SourceLocation RBracLoc, 2228 MultiExprArg Args) { 2229 // Determine whether we are inside a method or not. 2230 ObjCMethodDecl *Method = tryCaptureObjCSelf(SuperLoc); 2231 if (!Method) { 2232 Diag(SuperLoc, diag::err_invalid_receiver_to_message_super); 2233 return ExprError(); 2234 } 2235 2236 ObjCInterfaceDecl *Class = Method->getClassInterface(); 2237 if (!Class) { 2238 Diag(SuperLoc, diag::err_no_super_class_message) 2239 << Method->getDeclName(); 2240 return ExprError(); 2241 } 2242 2243 QualType SuperTy(Class->getSuperClassType(), 0); 2244 if (SuperTy.isNull()) { 2245 // The current class does not have a superclass. 2246 Diag(SuperLoc, diag::err_root_class_cannot_use_super) 2247 << Class->getIdentifier(); 2248 return ExprError(); 2249 } 2250 2251 // We are in a method whose class has a superclass, so 'super' 2252 // is acting as a keyword. 2253 if (Method->getSelector() == Sel) 2254 getCurFunction()->ObjCShouldCallSuper = false; 2255 2256 if (Method->isInstanceMethod()) { 2257 // Since we are in an instance method, this is an instance 2258 // message to the superclass instance. 2259 SuperTy = Context.getObjCObjectPointerType(SuperTy); 2260 return BuildInstanceMessage(nullptr, SuperTy, SuperLoc, 2261 Sel, /*Method=*/nullptr, 2262 LBracLoc, SelectorLocs, RBracLoc, Args); 2263 } 2264 2265 // Since we are in a class method, this is a class message to 2266 // the superclass. 2267 return BuildClassMessage(/*ReceiverTypeInfo=*/nullptr, 2268 SuperTy, 2269 SuperLoc, Sel, /*Method=*/nullptr, 2270 LBracLoc, SelectorLocs, RBracLoc, Args); 2271 } 2272 2273 ExprResult Sema::BuildClassMessageImplicit(QualType ReceiverType, 2274 bool isSuperReceiver, 2275 SourceLocation Loc, 2276 Selector Sel, 2277 ObjCMethodDecl *Method, 2278 MultiExprArg Args) { 2279 TypeSourceInfo *receiverTypeInfo = nullptr; 2280 if (!ReceiverType.isNull()) 2281 receiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType); 2282 2283 return BuildClassMessage(receiverTypeInfo, ReceiverType, 2284 /*SuperLoc=*/isSuperReceiver ? Loc : SourceLocation(), 2285 Sel, Method, Loc, Loc, Loc, Args, 2286 /*isImplicit=*/true); 2287 } 2288 2289 static void applyCocoaAPICheck(Sema &S, const ObjCMessageExpr *Msg, 2290 unsigned DiagID, 2291 bool (*refactor)(const ObjCMessageExpr *, 2292 const NSAPI &, edit::Commit &)) { 2293 SourceLocation MsgLoc = Msg->getExprLoc(); 2294 if (S.Diags.isIgnored(DiagID, MsgLoc)) 2295 return; 2296 2297 SourceManager &SM = S.SourceMgr; 2298 edit::Commit ECommit(SM, S.LangOpts); 2299 if (refactor(Msg,*S.NSAPIObj, ECommit)) { 2300 DiagnosticBuilder Builder = S.Diag(MsgLoc, DiagID) 2301 << Msg->getSelector() << Msg->getSourceRange(); 2302 // FIXME: Don't emit diagnostic at all if fixits are non-commitable. 2303 if (!ECommit.isCommitable()) 2304 return; 2305 for (edit::Commit::edit_iterator 2306 I = ECommit.edit_begin(), E = ECommit.edit_end(); I != E; ++I) { 2307 const edit::Commit::Edit &Edit = *I; 2308 switch (Edit.Kind) { 2309 case edit::Commit::Act_Insert: 2310 Builder.AddFixItHint(FixItHint::CreateInsertion(Edit.OrigLoc, 2311 Edit.Text, 2312 Edit.BeforePrev)); 2313 break; 2314 case edit::Commit::Act_InsertFromRange: 2315 Builder.AddFixItHint( 2316 FixItHint::CreateInsertionFromRange(Edit.OrigLoc, 2317 Edit.getInsertFromRange(SM), 2318 Edit.BeforePrev)); 2319 break; 2320 case edit::Commit::Act_Remove: 2321 Builder.AddFixItHint(FixItHint::CreateRemoval(Edit.getFileRange(SM))); 2322 break; 2323 } 2324 } 2325 } 2326 } 2327 2328 static void checkCocoaAPI(Sema &S, const ObjCMessageExpr *Msg) { 2329 applyCocoaAPICheck(S, Msg, diag::warn_objc_redundant_literal_use, 2330 edit::rewriteObjCRedundantCallWithLiteral); 2331 } 2332 2333 static void checkFoundationAPI(Sema &S, SourceLocation Loc, 2334 const ObjCMethodDecl *Method, 2335 ArrayRef<Expr *> Args, QualType ReceiverType, 2336 bool IsClassObjectCall) { 2337 // Check if this is a performSelector method that uses a selector that returns 2338 // a record or a vector type. 2339 if (Method->getSelector().getMethodFamily() != OMF_performSelector || 2340 Args.empty()) 2341 return; 2342 const auto *SE = dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens()); 2343 if (!SE) 2344 return; 2345 ObjCMethodDecl *ImpliedMethod; 2346 if (!IsClassObjectCall) { 2347 const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>(); 2348 if (!OPT || !OPT->getInterfaceDecl()) 2349 return; 2350 ImpliedMethod = 2351 OPT->getInterfaceDecl()->lookupInstanceMethod(SE->getSelector()); 2352 if (!ImpliedMethod) 2353 ImpliedMethod = 2354 OPT->getInterfaceDecl()->lookupPrivateMethod(SE->getSelector()); 2355 } else { 2356 const auto *IT = ReceiverType->getAs<ObjCInterfaceType>(); 2357 if (!IT) 2358 return; 2359 ImpliedMethod = IT->getDecl()->lookupClassMethod(SE->getSelector()); 2360 if (!ImpliedMethod) 2361 ImpliedMethod = 2362 IT->getDecl()->lookupPrivateClassMethod(SE->getSelector()); 2363 } 2364 if (!ImpliedMethod) 2365 return; 2366 QualType Ret = ImpliedMethod->getReturnType(); 2367 if (Ret->isRecordType() || Ret->isVectorType() || Ret->isExtVectorType()) { 2368 QualType Ret = ImpliedMethod->getReturnType(); 2369 S.Diag(Loc, diag::warn_objc_unsafe_perform_selector) 2370 << Method->getSelector() 2371 << (!Ret->isRecordType() 2372 ? /*Vector*/ 2 2373 : Ret->isUnionType() ? /*Union*/ 1 : /*Struct*/ 0); 2374 S.Diag(ImpliedMethod->getBeginLoc(), 2375 diag::note_objc_unsafe_perform_selector_method_declared_here) 2376 << ImpliedMethod->getSelector() << Ret; 2377 } 2378 } 2379 2380 /// Diagnose use of %s directive in an NSString which is being passed 2381 /// as formatting string to formatting method. 2382 static void 2383 DiagnoseCStringFormatDirectiveInObjCAPI(Sema &S, 2384 ObjCMethodDecl *Method, 2385 Selector Sel, 2386 Expr **Args, unsigned NumArgs) { 2387 unsigned Idx = 0; 2388 bool Format = false; 2389 ObjCStringFormatFamily SFFamily = Sel.getStringFormatFamily(); 2390 if (SFFamily == ObjCStringFormatFamily::SFF_NSString) { 2391 Idx = 0; 2392 Format = true; 2393 } 2394 else if (Method) { 2395 for (const auto *I : Method->specific_attrs<FormatAttr>()) { 2396 if (S.GetFormatNSStringIdx(I, Idx)) { 2397 Format = true; 2398 break; 2399 } 2400 } 2401 } 2402 if (!Format || NumArgs <= Idx) 2403 return; 2404 2405 Expr *FormatExpr = Args[Idx]; 2406 if (ObjCStringLiteral *OSL = 2407 dyn_cast<ObjCStringLiteral>(FormatExpr->IgnoreParenImpCasts())) { 2408 StringLiteral *FormatString = OSL->getString(); 2409 if (S.FormatStringHasSArg(FormatString)) { 2410 S.Diag(FormatExpr->getExprLoc(), diag::warn_objc_cdirective_format_string) 2411 << "%s" << 0 << 0; 2412 if (Method) 2413 S.Diag(Method->getLocation(), diag::note_method_declared_at) 2414 << Method->getDeclName(); 2415 } 2416 } 2417 } 2418 2419 /// Build an Objective-C class message expression. 2420 /// 2421 /// This routine takes care of both normal class messages and 2422 /// class messages to the superclass. 2423 /// 2424 /// \param ReceiverTypeInfo Type source information that describes the 2425 /// receiver of this message. This may be NULL, in which case we are 2426 /// sending to the superclass and \p SuperLoc must be a valid source 2427 /// location. 2428 2429 /// \param ReceiverType The type of the object receiving the 2430 /// message. When \p ReceiverTypeInfo is non-NULL, this is the same 2431 /// type as that refers to. For a superclass send, this is the type of 2432 /// the superclass. 2433 /// 2434 /// \param SuperLoc The location of the "super" keyword in a 2435 /// superclass message. 2436 /// 2437 /// \param Sel The selector to which the message is being sent. 2438 /// 2439 /// \param Method The method that this class message is invoking, if 2440 /// already known. 2441 /// 2442 /// \param LBracLoc The location of the opening square bracket ']'. 2443 /// 2444 /// \param RBracLoc The location of the closing square bracket ']'. 2445 /// 2446 /// \param ArgsIn The message arguments. 2447 ExprResult Sema::BuildClassMessage(TypeSourceInfo *ReceiverTypeInfo, 2448 QualType ReceiverType, 2449 SourceLocation SuperLoc, 2450 Selector Sel, 2451 ObjCMethodDecl *Method, 2452 SourceLocation LBracLoc, 2453 ArrayRef<SourceLocation> SelectorLocs, 2454 SourceLocation RBracLoc, 2455 MultiExprArg ArgsIn, 2456 bool isImplicit) { 2457 SourceLocation Loc = SuperLoc.isValid()? SuperLoc 2458 : ReceiverTypeInfo->getTypeLoc().getSourceRange().getBegin(); 2459 if (LBracLoc.isInvalid()) { 2460 Diag(Loc, diag::err_missing_open_square_message_send) 2461 << FixItHint::CreateInsertion(Loc, "["); 2462 LBracLoc = Loc; 2463 } 2464 ArrayRef<SourceLocation> SelectorSlotLocs; 2465 if (!SelectorLocs.empty() && SelectorLocs.front().isValid()) 2466 SelectorSlotLocs = SelectorLocs; 2467 else 2468 SelectorSlotLocs = Loc; 2469 SourceLocation SelLoc = SelectorSlotLocs.front(); 2470 2471 if (ReceiverType->isDependentType()) { 2472 // If the receiver type is dependent, we can't type-check anything 2473 // at this point. Build a dependent expression. 2474 unsigned NumArgs = ArgsIn.size(); 2475 Expr **Args = ArgsIn.data(); 2476 assert(SuperLoc.isInvalid() && "Message to super with dependent type"); 2477 return ObjCMessageExpr::Create( 2478 Context, ReceiverType, VK_RValue, LBracLoc, ReceiverTypeInfo, Sel, 2479 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs), RBracLoc, 2480 isImplicit); 2481 } 2482 2483 // Find the class to which we are sending this message. 2484 ObjCInterfaceDecl *Class = nullptr; 2485 const ObjCObjectType *ClassType = ReceiverType->getAs<ObjCObjectType>(); 2486 if (!ClassType || !(Class = ClassType->getInterface())) { 2487 Diag(Loc, diag::err_invalid_receiver_class_message) 2488 << ReceiverType; 2489 return ExprError(); 2490 } 2491 assert(Class && "We don't know which class we're messaging?"); 2492 // objc++ diagnoses during typename annotation. 2493 if (!getLangOpts().CPlusPlus) 2494 (void)DiagnoseUseOfDecl(Class, SelectorSlotLocs); 2495 // Find the method we are messaging. 2496 if (!Method) { 2497 SourceRange TypeRange 2498 = SuperLoc.isValid()? SourceRange(SuperLoc) 2499 : ReceiverTypeInfo->getTypeLoc().getSourceRange(); 2500 if (RequireCompleteType(Loc, Context.getObjCInterfaceType(Class), 2501 (getLangOpts().ObjCAutoRefCount 2502 ? diag::err_arc_receiver_forward_class 2503 : diag::warn_receiver_forward_class), 2504 TypeRange)) { 2505 // A forward class used in messaging is treated as a 'Class' 2506 Method = LookupFactoryMethodInGlobalPool(Sel, 2507 SourceRange(LBracLoc, RBracLoc)); 2508 if (Method && !getLangOpts().ObjCAutoRefCount) 2509 Diag(Method->getLocation(), diag::note_method_sent_forward_class) 2510 << Method->getDeclName(); 2511 } 2512 if (!Method) 2513 Method = Class->lookupClassMethod(Sel); 2514 2515 // If we have an implementation in scope, check "private" methods. 2516 if (!Method) 2517 Method = Class->lookupPrivateClassMethod(Sel); 2518 2519 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs, 2520 nullptr, false, false, Class)) 2521 return ExprError(); 2522 } 2523 2524 // Check the argument types and determine the result type. 2525 QualType ReturnType; 2526 ExprValueKind VK = VK_RValue; 2527 2528 unsigned NumArgs = ArgsIn.size(); 2529 Expr **Args = ArgsIn.data(); 2530 if (CheckMessageArgumentTypes(/*Receiver=*/nullptr, ReceiverType, 2531 MultiExprArg(Args, NumArgs), Sel, SelectorLocs, 2532 Method, true, SuperLoc.isValid(), LBracLoc, 2533 RBracLoc, SourceRange(), ReturnType, VK)) 2534 return ExprError(); 2535 2536 if (Method && !Method->getReturnType()->isVoidType() && 2537 RequireCompleteType(LBracLoc, Method->getReturnType(), 2538 diag::err_illegal_message_expr_incomplete_type)) 2539 return ExprError(); 2540 2541 // Warn about explicit call of +initialize on its own class. But not on 'super'. 2542 if (Method && Method->getMethodFamily() == OMF_initialize) { 2543 if (!SuperLoc.isValid()) { 2544 const ObjCInterfaceDecl *ID = 2545 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext()); 2546 if (ID == Class) { 2547 Diag(Loc, diag::warn_direct_initialize_call); 2548 Diag(Method->getLocation(), diag::note_method_declared_at) 2549 << Method->getDeclName(); 2550 } 2551 } 2552 else if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) { 2553 // [super initialize] is allowed only within an +initialize implementation 2554 if (CurMeth->getMethodFamily() != OMF_initialize) { 2555 Diag(Loc, diag::warn_direct_super_initialize_call); 2556 Diag(Method->getLocation(), diag::note_method_declared_at) 2557 << Method->getDeclName(); 2558 Diag(CurMeth->getLocation(), diag::note_method_declared_at) 2559 << CurMeth->getDeclName(); 2560 } 2561 } 2562 } 2563 2564 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs); 2565 2566 // Construct the appropriate ObjCMessageExpr. 2567 ObjCMessageExpr *Result; 2568 if (SuperLoc.isValid()) 2569 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc, 2570 SuperLoc, /*IsInstanceSuper=*/false, 2571 ReceiverType, Sel, SelectorLocs, 2572 Method, makeArrayRef(Args, NumArgs), 2573 RBracLoc, isImplicit); 2574 else { 2575 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc, 2576 ReceiverTypeInfo, Sel, SelectorLocs, 2577 Method, makeArrayRef(Args, NumArgs), 2578 RBracLoc, isImplicit); 2579 if (!isImplicit) 2580 checkCocoaAPI(*this, Result); 2581 } 2582 if (Method) 2583 checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs), 2584 ReceiverType, /*IsClassObjectCall=*/true); 2585 return MaybeBindToTemporary(Result); 2586 } 2587 2588 // ActOnClassMessage - used for both unary and keyword messages. 2589 // ArgExprs is optional - if it is present, the number of expressions 2590 // is obtained from Sel.getNumArgs(). 2591 ExprResult Sema::ActOnClassMessage(Scope *S, 2592 ParsedType Receiver, 2593 Selector Sel, 2594 SourceLocation LBracLoc, 2595 ArrayRef<SourceLocation> SelectorLocs, 2596 SourceLocation RBracLoc, 2597 MultiExprArg Args) { 2598 TypeSourceInfo *ReceiverTypeInfo; 2599 QualType ReceiverType = GetTypeFromParser(Receiver, &ReceiverTypeInfo); 2600 if (ReceiverType.isNull()) 2601 return ExprError(); 2602 2603 if (!ReceiverTypeInfo) 2604 ReceiverTypeInfo = Context.getTrivialTypeSourceInfo(ReceiverType, LBracLoc); 2605 2606 return BuildClassMessage(ReceiverTypeInfo, ReceiverType, 2607 /*SuperLoc=*/SourceLocation(), Sel, 2608 /*Method=*/nullptr, LBracLoc, SelectorLocs, RBracLoc, 2609 Args); 2610 } 2611 2612 ExprResult Sema::BuildInstanceMessageImplicit(Expr *Receiver, 2613 QualType ReceiverType, 2614 SourceLocation Loc, 2615 Selector Sel, 2616 ObjCMethodDecl *Method, 2617 MultiExprArg Args) { 2618 return BuildInstanceMessage(Receiver, ReceiverType, 2619 /*SuperLoc=*/!Receiver ? Loc : SourceLocation(), 2620 Sel, Method, Loc, Loc, Loc, Args, 2621 /*isImplicit=*/true); 2622 } 2623 2624 static bool isMethodDeclaredInRootProtocol(Sema &S, const ObjCMethodDecl *M) { 2625 if (!S.NSAPIObj) 2626 return false; 2627 const auto *Protocol = dyn_cast<ObjCProtocolDecl>(M->getDeclContext()); 2628 if (!Protocol) 2629 return false; 2630 const IdentifierInfo *II = S.NSAPIObj->getNSClassId(NSAPI::ClassId_NSObject); 2631 if (const auto *RootClass = dyn_cast_or_null<ObjCInterfaceDecl>( 2632 S.LookupSingleName(S.TUScope, II, Protocol->getBeginLoc(), 2633 Sema::LookupOrdinaryName))) { 2634 for (const ObjCProtocolDecl *P : RootClass->all_referenced_protocols()) { 2635 if (P->getCanonicalDecl() == Protocol->getCanonicalDecl()) 2636 return true; 2637 } 2638 } 2639 return false; 2640 } 2641 2642 /// Build an Objective-C instance message expression. 2643 /// 2644 /// This routine takes care of both normal instance messages and 2645 /// instance messages to the superclass instance. 2646 /// 2647 /// \param Receiver The expression that computes the object that will 2648 /// receive this message. This may be empty, in which case we are 2649 /// sending to the superclass instance and \p SuperLoc must be a valid 2650 /// source location. 2651 /// 2652 /// \param ReceiverType The (static) type of the object receiving the 2653 /// message. When a \p Receiver expression is provided, this is the 2654 /// same type as that expression. For a superclass instance send, this 2655 /// is a pointer to the type of the superclass. 2656 /// 2657 /// \param SuperLoc The location of the "super" keyword in a 2658 /// superclass instance message. 2659 /// 2660 /// \param Sel The selector to which the message is being sent. 2661 /// 2662 /// \param Method The method that this instance message is invoking, if 2663 /// already known. 2664 /// 2665 /// \param LBracLoc The location of the opening square bracket ']'. 2666 /// 2667 /// \param RBracLoc The location of the closing square bracket ']'. 2668 /// 2669 /// \param ArgsIn The message arguments. 2670 ExprResult Sema::BuildInstanceMessage(Expr *Receiver, 2671 QualType ReceiverType, 2672 SourceLocation SuperLoc, 2673 Selector Sel, 2674 ObjCMethodDecl *Method, 2675 SourceLocation LBracLoc, 2676 ArrayRef<SourceLocation> SelectorLocs, 2677 SourceLocation RBracLoc, 2678 MultiExprArg ArgsIn, 2679 bool isImplicit) { 2680 assert((Receiver || SuperLoc.isValid()) && "If the Receiver is null, the " 2681 "SuperLoc must be valid so we can " 2682 "use it instead."); 2683 2684 // The location of the receiver. 2685 SourceLocation Loc = SuperLoc.isValid() ? SuperLoc : Receiver->getBeginLoc(); 2686 SourceRange RecRange = 2687 SuperLoc.isValid()? SuperLoc : Receiver->getSourceRange(); 2688 ArrayRef<SourceLocation> SelectorSlotLocs; 2689 if (!SelectorLocs.empty() && SelectorLocs.front().isValid()) 2690 SelectorSlotLocs = SelectorLocs; 2691 else 2692 SelectorSlotLocs = Loc; 2693 SourceLocation SelLoc = SelectorSlotLocs.front(); 2694 2695 if (LBracLoc.isInvalid()) { 2696 Diag(Loc, diag::err_missing_open_square_message_send) 2697 << FixItHint::CreateInsertion(Loc, "["); 2698 LBracLoc = Loc; 2699 } 2700 2701 // If we have a receiver expression, perform appropriate promotions 2702 // and determine receiver type. 2703 if (Receiver) { 2704 if (Receiver->hasPlaceholderType()) { 2705 ExprResult Result; 2706 if (Receiver->getType() == Context.UnknownAnyTy) 2707 Result = forceUnknownAnyToType(Receiver, Context.getObjCIdType()); 2708 else 2709 Result = CheckPlaceholderExpr(Receiver); 2710 if (Result.isInvalid()) return ExprError(); 2711 Receiver = Result.get(); 2712 } 2713 2714 if (Receiver->isTypeDependent()) { 2715 // If the receiver is type-dependent, we can't type-check anything 2716 // at this point. Build a dependent expression. 2717 unsigned NumArgs = ArgsIn.size(); 2718 Expr **Args = ArgsIn.data(); 2719 assert(SuperLoc.isInvalid() && "Message to super with dependent type"); 2720 return ObjCMessageExpr::Create( 2721 Context, Context.DependentTy, VK_RValue, LBracLoc, Receiver, Sel, 2722 SelectorLocs, /*Method=*/nullptr, makeArrayRef(Args, NumArgs), 2723 RBracLoc, isImplicit); 2724 } 2725 2726 // If necessary, apply function/array conversion to the receiver. 2727 // C99 6.7.5.3p[7,8]. 2728 ExprResult Result = DefaultFunctionArrayLvalueConversion(Receiver); 2729 if (Result.isInvalid()) 2730 return ExprError(); 2731 Receiver = Result.get(); 2732 ReceiverType = Receiver->getType(); 2733 2734 // If the receiver is an ObjC pointer, a block pointer, or an 2735 // __attribute__((NSObject)) pointer, we don't need to do any 2736 // special conversion in order to look up a receiver. 2737 if (ReceiverType->isObjCRetainableType()) { 2738 // do nothing 2739 } else if (!getLangOpts().ObjCAutoRefCount && 2740 !Context.getObjCIdType().isNull() && 2741 (ReceiverType->isPointerType() || 2742 ReceiverType->isIntegerType())) { 2743 // Implicitly convert integers and pointers to 'id' but emit a warning. 2744 // But not in ARC. 2745 Diag(Loc, diag::warn_bad_receiver_type) 2746 << ReceiverType 2747 << Receiver->getSourceRange(); 2748 if (ReceiverType->isPointerType()) { 2749 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(), 2750 CK_CPointerToObjCPointerCast).get(); 2751 } else { 2752 // TODO: specialized warning on null receivers? 2753 bool IsNull = Receiver->isNullPointerConstant(Context, 2754 Expr::NPC_ValueDependentIsNull); 2755 CastKind Kind = IsNull ? CK_NullToPointer : CK_IntegralToPointer; 2756 Receiver = ImpCastExprToType(Receiver, Context.getObjCIdType(), 2757 Kind).get(); 2758 } 2759 ReceiverType = Receiver->getType(); 2760 } else if (getLangOpts().CPlusPlus) { 2761 // The receiver must be a complete type. 2762 if (RequireCompleteType(Loc, Receiver->getType(), 2763 diag::err_incomplete_receiver_type)) 2764 return ExprError(); 2765 2766 ExprResult result = PerformContextuallyConvertToObjCPointer(Receiver); 2767 if (result.isUsable()) { 2768 Receiver = result.get(); 2769 ReceiverType = Receiver->getType(); 2770 } 2771 } 2772 } 2773 2774 if (ReceiverType->isObjCIdType() && !isImplicit) 2775 Diag(Receiver->getExprLoc(), diag::warn_messaging_unqualified_id); 2776 2777 // There's a somewhat weird interaction here where we assume that we 2778 // won't actually have a method unless we also don't need to do some 2779 // of the more detailed type-checking on the receiver. 2780 2781 if (!Method) { 2782 // Handle messages to id and __kindof types (where we use the 2783 // global method pool). 2784 const ObjCObjectType *typeBound = nullptr; 2785 bool receiverIsIdLike = ReceiverType->isObjCIdOrObjectKindOfType(Context, 2786 typeBound); 2787 if (receiverIsIdLike || ReceiverType->isBlockPointerType() || 2788 (Receiver && Context.isObjCNSObjectType(Receiver->getType()))) { 2789 SmallVector<ObjCMethodDecl*, 4> Methods; 2790 // If we have a type bound, further filter the methods. 2791 CollectMultipleMethodsInGlobalPool(Sel, Methods, true/*InstanceFirst*/, 2792 true/*CheckTheOther*/, typeBound); 2793 if (!Methods.empty()) { 2794 // We choose the first method as the initial candidate, then try to 2795 // select a better one. 2796 Method = Methods[0]; 2797 2798 if (ObjCMethodDecl *BestMethod = 2799 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(), Methods)) 2800 Method = BestMethod; 2801 2802 if (!AreMultipleMethodsInGlobalPool(Sel, Method, 2803 SourceRange(LBracLoc, RBracLoc), 2804 receiverIsIdLike, Methods)) 2805 DiagnoseUseOfDecl(Method, SelectorSlotLocs); 2806 } 2807 } else if (ReceiverType->isObjCClassOrClassKindOfType() || 2808 ReceiverType->isObjCQualifiedClassType()) { 2809 // Handle messages to Class. 2810 // We allow sending a message to a qualified Class ("Class<foo>"), which 2811 // is ok as long as one of the protocols implements the selector (if not, 2812 // warn). 2813 if (!ReceiverType->isObjCClassOrClassKindOfType()) { 2814 const ObjCObjectPointerType *QClassTy 2815 = ReceiverType->getAsObjCQualifiedClassType(); 2816 // Search protocols for class methods. 2817 Method = LookupMethodInQualifiedType(Sel, QClassTy, false); 2818 if (!Method) { 2819 Method = LookupMethodInQualifiedType(Sel, QClassTy, true); 2820 // warn if instance method found for a Class message. 2821 if (Method && !isMethodDeclaredInRootProtocol(*this, Method)) { 2822 Diag(SelLoc, diag::warn_instance_method_on_class_found) 2823 << Method->getSelector() << Sel; 2824 Diag(Method->getLocation(), diag::note_method_declared_at) 2825 << Method->getDeclName(); 2826 } 2827 } 2828 } else { 2829 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) { 2830 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) { 2831 // As a guess, try looking for the method in the current interface. 2832 // This very well may not produce the "right" method. 2833 2834 // First check the public methods in the class interface. 2835 Method = ClassDecl->lookupClassMethod(Sel); 2836 2837 if (!Method) 2838 Method = ClassDecl->lookupPrivateClassMethod(Sel); 2839 2840 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs)) 2841 return ExprError(); 2842 } 2843 } 2844 if (!Method) { 2845 // If not messaging 'self', look for any factory method named 'Sel'. 2846 if (!Receiver || !isSelfExpr(Receiver)) { 2847 // If no class (factory) method was found, check if an _instance_ 2848 // method of the same name exists in the root class only. 2849 SmallVector<ObjCMethodDecl*, 4> Methods; 2850 CollectMultipleMethodsInGlobalPool(Sel, Methods, 2851 false/*InstanceFirst*/, 2852 true/*CheckTheOther*/); 2853 if (!Methods.empty()) { 2854 // We choose the first method as the initial candidate, then try 2855 // to select a better one. 2856 Method = Methods[0]; 2857 2858 // If we find an instance method, emit warning. 2859 if (Method->isInstanceMethod()) { 2860 if (const ObjCInterfaceDecl *ID = 2861 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) { 2862 if (ID->getSuperClass()) 2863 Diag(SelLoc, diag::warn_root_inst_method_not_found) 2864 << Sel << SourceRange(LBracLoc, RBracLoc); 2865 } 2866 } 2867 2868 if (ObjCMethodDecl *BestMethod = 2869 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(), 2870 Methods)) 2871 Method = BestMethod; 2872 } 2873 } 2874 } 2875 } 2876 } else { 2877 ObjCInterfaceDecl *ClassDecl = nullptr; 2878 2879 // We allow sending a message to a qualified ID ("id<foo>"), which is ok as 2880 // long as one of the protocols implements the selector (if not, warn). 2881 // And as long as message is not deprecated/unavailable (warn if it is). 2882 if (const ObjCObjectPointerType *QIdTy 2883 = ReceiverType->getAsObjCQualifiedIdType()) { 2884 // Search protocols for instance methods. 2885 Method = LookupMethodInQualifiedType(Sel, QIdTy, true); 2886 if (!Method) 2887 Method = LookupMethodInQualifiedType(Sel, QIdTy, false); 2888 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs)) 2889 return ExprError(); 2890 } else if (const ObjCObjectPointerType *OCIType 2891 = ReceiverType->getAsObjCInterfacePointerType()) { 2892 // We allow sending a message to a pointer to an interface (an object). 2893 ClassDecl = OCIType->getInterfaceDecl(); 2894 2895 // Try to complete the type. Under ARC, this is a hard error from which 2896 // we don't try to recover. 2897 // FIXME: In the non-ARC case, this will still be a hard error if the 2898 // definition is found in a module that's not visible. 2899 const ObjCInterfaceDecl *forwardClass = nullptr; 2900 if (RequireCompleteType(Loc, OCIType->getPointeeType(), 2901 getLangOpts().ObjCAutoRefCount 2902 ? diag::err_arc_receiver_forward_instance 2903 : diag::warn_receiver_forward_instance, 2904 Receiver? Receiver->getSourceRange() 2905 : SourceRange(SuperLoc))) { 2906 if (getLangOpts().ObjCAutoRefCount) 2907 return ExprError(); 2908 2909 forwardClass = OCIType->getInterfaceDecl(); 2910 Diag(Receiver ? Receiver->getBeginLoc() : SuperLoc, 2911 diag::note_receiver_is_id); 2912 Method = nullptr; 2913 } else { 2914 Method = ClassDecl->lookupInstanceMethod(Sel); 2915 } 2916 2917 if (!Method) 2918 // Search protocol qualifiers. 2919 Method = LookupMethodInQualifiedType(Sel, OCIType, true); 2920 2921 if (!Method) { 2922 // If we have implementations in scope, check "private" methods. 2923 Method = ClassDecl->lookupPrivateMethod(Sel); 2924 2925 if (!Method && getLangOpts().ObjCAutoRefCount) { 2926 Diag(SelLoc, diag::err_arc_may_not_respond) 2927 << OCIType->getPointeeType() << Sel << RecRange 2928 << SourceRange(SelectorLocs.front(), SelectorLocs.back()); 2929 return ExprError(); 2930 } 2931 2932 if (!Method && (!Receiver || !isSelfExpr(Receiver))) { 2933 // If we still haven't found a method, look in the global pool. This 2934 // behavior isn't very desirable, however we need it for GCC 2935 // compatibility. FIXME: should we deviate?? 2936 if (OCIType->qual_empty()) { 2937 SmallVector<ObjCMethodDecl*, 4> Methods; 2938 CollectMultipleMethodsInGlobalPool(Sel, Methods, 2939 true/*InstanceFirst*/, 2940 false/*CheckTheOther*/); 2941 if (!Methods.empty()) { 2942 // We choose the first method as the initial candidate, then try 2943 // to select a better one. 2944 Method = Methods[0]; 2945 2946 if (ObjCMethodDecl *BestMethod = 2947 SelectBestMethod(Sel, ArgsIn, Method->isInstanceMethod(), 2948 Methods)) 2949 Method = BestMethod; 2950 2951 AreMultipleMethodsInGlobalPool(Sel, Method, 2952 SourceRange(LBracLoc, RBracLoc), 2953 true/*receiverIdOrClass*/, 2954 Methods); 2955 } 2956 if (Method && !forwardClass) 2957 Diag(SelLoc, diag::warn_maynot_respond) 2958 << OCIType->getInterfaceDecl()->getIdentifier() 2959 << Sel << RecRange; 2960 } 2961 } 2962 } 2963 if (Method && DiagnoseUseOfDecl(Method, SelectorSlotLocs, forwardClass)) 2964 return ExprError(); 2965 } else { 2966 // Reject other random receiver types (e.g. structs). 2967 Diag(Loc, diag::err_bad_receiver_type) 2968 << ReceiverType << Receiver->getSourceRange(); 2969 return ExprError(); 2970 } 2971 } 2972 } 2973 2974 FunctionScopeInfo *DIFunctionScopeInfo = 2975 (Method && Method->getMethodFamily() == OMF_init) 2976 ? getEnclosingFunction() : nullptr; 2977 2978 if (DIFunctionScopeInfo && 2979 DIFunctionScopeInfo->ObjCIsDesignatedInit && 2980 (SuperLoc.isValid() || isSelfExpr(Receiver))) { 2981 bool isDesignatedInitChain = false; 2982 if (SuperLoc.isValid()) { 2983 if (const ObjCObjectPointerType * 2984 OCIType = ReceiverType->getAsObjCInterfacePointerType()) { 2985 if (const ObjCInterfaceDecl *ID = OCIType->getInterfaceDecl()) { 2986 // Either we know this is a designated initializer or we 2987 // conservatively assume it because we don't know for sure. 2988 if (!ID->declaresOrInheritsDesignatedInitializers() || 2989 ID->isDesignatedInitializer(Sel)) { 2990 isDesignatedInitChain = true; 2991 DIFunctionScopeInfo->ObjCWarnForNoDesignatedInitChain = false; 2992 } 2993 } 2994 } 2995 } 2996 if (!isDesignatedInitChain) { 2997 const ObjCMethodDecl *InitMethod = nullptr; 2998 bool isDesignated = 2999 getCurMethodDecl()->isDesignatedInitializerForTheInterface(&InitMethod); 3000 assert(isDesignated && InitMethod); 3001 (void)isDesignated; 3002 Diag(SelLoc, SuperLoc.isValid() ? 3003 diag::warn_objc_designated_init_non_designated_init_call : 3004 diag::warn_objc_designated_init_non_super_designated_init_call); 3005 Diag(InitMethod->getLocation(), 3006 diag::note_objc_designated_init_marked_here); 3007 } 3008 } 3009 3010 if (DIFunctionScopeInfo && 3011 DIFunctionScopeInfo->ObjCIsSecondaryInit && 3012 (SuperLoc.isValid() || isSelfExpr(Receiver))) { 3013 if (SuperLoc.isValid()) { 3014 Diag(SelLoc, diag::warn_objc_secondary_init_super_init_call); 3015 } else { 3016 DIFunctionScopeInfo->ObjCWarnForNoInitDelegation = false; 3017 } 3018 } 3019 3020 // Check the message arguments. 3021 unsigned NumArgs = ArgsIn.size(); 3022 Expr **Args = ArgsIn.data(); 3023 QualType ReturnType; 3024 ExprValueKind VK = VK_RValue; 3025 bool ClassMessage = (ReceiverType->isObjCClassType() || 3026 ReceiverType->isObjCQualifiedClassType()); 3027 if (CheckMessageArgumentTypes(Receiver, ReceiverType, 3028 MultiExprArg(Args, NumArgs), Sel, SelectorLocs, 3029 Method, ClassMessage, SuperLoc.isValid(), 3030 LBracLoc, RBracLoc, RecRange, ReturnType, VK)) 3031 return ExprError(); 3032 3033 if (Method && !Method->getReturnType()->isVoidType() && 3034 RequireCompleteType(LBracLoc, Method->getReturnType(), 3035 diag::err_illegal_message_expr_incomplete_type)) 3036 return ExprError(); 3037 3038 // In ARC, forbid the user from sending messages to 3039 // retain/release/autorelease/dealloc/retainCount explicitly. 3040 if (getLangOpts().ObjCAutoRefCount) { 3041 ObjCMethodFamily family = 3042 (Method ? Method->getMethodFamily() : Sel.getMethodFamily()); 3043 switch (family) { 3044 case OMF_init: 3045 if (Method) 3046 checkInitMethod(Method, ReceiverType); 3047 break; 3048 3049 case OMF_None: 3050 case OMF_alloc: 3051 case OMF_copy: 3052 case OMF_finalize: 3053 case OMF_mutableCopy: 3054 case OMF_new: 3055 case OMF_self: 3056 case OMF_initialize: 3057 break; 3058 3059 case OMF_dealloc: 3060 case OMF_retain: 3061 case OMF_release: 3062 case OMF_autorelease: 3063 case OMF_retainCount: 3064 Diag(SelLoc, diag::err_arc_illegal_explicit_message) 3065 << Sel << RecRange; 3066 break; 3067 3068 case OMF_performSelector: 3069 if (Method && NumArgs >= 1) { 3070 if (const auto *SelExp = 3071 dyn_cast<ObjCSelectorExpr>(Args[0]->IgnoreParens())) { 3072 Selector ArgSel = SelExp->getSelector(); 3073 ObjCMethodDecl *SelMethod = 3074 LookupInstanceMethodInGlobalPool(ArgSel, 3075 SelExp->getSourceRange()); 3076 if (!SelMethod) 3077 SelMethod = 3078 LookupFactoryMethodInGlobalPool(ArgSel, 3079 SelExp->getSourceRange()); 3080 if (SelMethod) { 3081 ObjCMethodFamily SelFamily = SelMethod->getMethodFamily(); 3082 switch (SelFamily) { 3083 case OMF_alloc: 3084 case OMF_copy: 3085 case OMF_mutableCopy: 3086 case OMF_new: 3087 case OMF_init: 3088 // Issue error, unless ns_returns_not_retained. 3089 if (!SelMethod->hasAttr<NSReturnsNotRetainedAttr>()) { 3090 // selector names a +1 method 3091 Diag(SelLoc, 3092 diag::err_arc_perform_selector_retains); 3093 Diag(SelMethod->getLocation(), diag::note_method_declared_at) 3094 << SelMethod->getDeclName(); 3095 } 3096 break; 3097 default: 3098 // +0 call. OK. unless ns_returns_retained. 3099 if (SelMethod->hasAttr<NSReturnsRetainedAttr>()) { 3100 // selector names a +1 method 3101 Diag(SelLoc, 3102 diag::err_arc_perform_selector_retains); 3103 Diag(SelMethod->getLocation(), diag::note_method_declared_at) 3104 << SelMethod->getDeclName(); 3105 } 3106 break; 3107 } 3108 } 3109 } else { 3110 // error (may leak). 3111 Diag(SelLoc, diag::warn_arc_perform_selector_leaks); 3112 Diag(Args[0]->getExprLoc(), diag::note_used_here); 3113 } 3114 } 3115 break; 3116 } 3117 } 3118 3119 DiagnoseCStringFormatDirectiveInObjCAPI(*this, Method, Sel, Args, NumArgs); 3120 3121 // Construct the appropriate ObjCMessageExpr instance. 3122 ObjCMessageExpr *Result; 3123 if (SuperLoc.isValid()) 3124 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc, 3125 SuperLoc, /*IsInstanceSuper=*/true, 3126 ReceiverType, Sel, SelectorLocs, Method, 3127 makeArrayRef(Args, NumArgs), RBracLoc, 3128 isImplicit); 3129 else { 3130 Result = ObjCMessageExpr::Create(Context, ReturnType, VK, LBracLoc, 3131 Receiver, Sel, SelectorLocs, Method, 3132 makeArrayRef(Args, NumArgs), RBracLoc, 3133 isImplicit); 3134 if (!isImplicit) 3135 checkCocoaAPI(*this, Result); 3136 } 3137 if (Method) { 3138 bool IsClassObjectCall = ClassMessage; 3139 // 'self' message receivers in class methods should be treated as message 3140 // sends to the class object in order for the semantic checks to be 3141 // performed correctly. Messages to 'super' already count as class messages, 3142 // so they don't need to be handled here. 3143 if (Receiver && isSelfExpr(Receiver)) { 3144 if (const auto *OPT = ReceiverType->getAs<ObjCObjectPointerType>()) { 3145 if (OPT->getObjectType()->isObjCClass()) { 3146 if (const auto *CurMeth = getCurMethodDecl()) { 3147 IsClassObjectCall = true; 3148 ReceiverType = 3149 Context.getObjCInterfaceType(CurMeth->getClassInterface()); 3150 } 3151 } 3152 } 3153 } 3154 checkFoundationAPI(*this, SelLoc, Method, makeArrayRef(Args, NumArgs), 3155 ReceiverType, IsClassObjectCall); 3156 } 3157 3158 if (getLangOpts().ObjCAutoRefCount) { 3159 // In ARC, annotate delegate init calls. 3160 if (Result->getMethodFamily() == OMF_init && 3161 (SuperLoc.isValid() || isSelfExpr(Receiver))) { 3162 // Only consider init calls *directly* in init implementations, 3163 // not within blocks. 3164 ObjCMethodDecl *method = dyn_cast<ObjCMethodDecl>(CurContext); 3165 if (method && method->getMethodFamily() == OMF_init) { 3166 // The implicit assignment to self means we also don't want to 3167 // consume the result. 3168 Result->setDelegateInitCall(true); 3169 return Result; 3170 } 3171 } 3172 3173 // In ARC, check for message sends which are likely to introduce 3174 // retain cycles. 3175 checkRetainCycles(Result); 3176 } 3177 3178 if (getLangOpts().ObjCWeak) { 3179 if (!isImplicit && Method) { 3180 if (const ObjCPropertyDecl *Prop = Method->findPropertyDecl()) { 3181 bool IsWeak = 3182 Prop->getPropertyAttributes() & ObjCPropertyDecl::OBJC_PR_weak; 3183 if (!IsWeak && Sel.isUnarySelector()) 3184 IsWeak = ReturnType.getObjCLifetime() & Qualifiers::OCL_Weak; 3185 if (IsWeak && !isUnevaluatedContext() && 3186 !Diags.isIgnored(diag::warn_arc_repeated_use_of_weak, LBracLoc)) 3187 getCurFunction()->recordUseOfWeak(Result, Prop); 3188 } 3189 } 3190 } 3191 3192 CheckObjCCircularContainer(Result); 3193 3194 return MaybeBindToTemporary(Result); 3195 } 3196 3197 static void RemoveSelectorFromWarningCache(Sema &S, Expr* Arg) { 3198 if (ObjCSelectorExpr *OSE = 3199 dyn_cast<ObjCSelectorExpr>(Arg->IgnoreParenCasts())) { 3200 Selector Sel = OSE->getSelector(); 3201 SourceLocation Loc = OSE->getAtLoc(); 3202 auto Pos = S.ReferencedSelectors.find(Sel); 3203 if (Pos != S.ReferencedSelectors.end() && Pos->second == Loc) 3204 S.ReferencedSelectors.erase(Pos); 3205 } 3206 } 3207 3208 // ActOnInstanceMessage - used for both unary and keyword messages. 3209 // ArgExprs is optional - if it is present, the number of expressions 3210 // is obtained from Sel.getNumArgs(). 3211 ExprResult Sema::ActOnInstanceMessage(Scope *S, 3212 Expr *Receiver, 3213 Selector Sel, 3214 SourceLocation LBracLoc, 3215 ArrayRef<SourceLocation> SelectorLocs, 3216 SourceLocation RBracLoc, 3217 MultiExprArg Args) { 3218 if (!Receiver) 3219 return ExprError(); 3220 3221 // A ParenListExpr can show up while doing error recovery with invalid code. 3222 if (isa<ParenListExpr>(Receiver)) { 3223 ExprResult Result = MaybeConvertParenListExprToParenExpr(S, Receiver); 3224 if (Result.isInvalid()) return ExprError(); 3225 Receiver = Result.get(); 3226 } 3227 3228 if (RespondsToSelectorSel.isNull()) { 3229 IdentifierInfo *SelectorId = &Context.Idents.get("respondsToSelector"); 3230 RespondsToSelectorSel = Context.Selectors.getUnarySelector(SelectorId); 3231 } 3232 if (Sel == RespondsToSelectorSel) 3233 RemoveSelectorFromWarningCache(*this, Args[0]); 3234 3235 return BuildInstanceMessage(Receiver, Receiver->getType(), 3236 /*SuperLoc=*/SourceLocation(), Sel, 3237 /*Method=*/nullptr, LBracLoc, SelectorLocs, 3238 RBracLoc, Args); 3239 } 3240 3241 enum ARCConversionTypeClass { 3242 /// int, void, struct A 3243 ACTC_none, 3244 3245 /// id, void (^)() 3246 ACTC_retainable, 3247 3248 /// id*, id***, void (^*)(), 3249 ACTC_indirectRetainable, 3250 3251 /// void* might be a normal C type, or it might a CF type. 3252 ACTC_voidPtr, 3253 3254 /// struct A* 3255 ACTC_coreFoundation 3256 }; 3257 3258 static bool isAnyRetainable(ARCConversionTypeClass ACTC) { 3259 return (ACTC == ACTC_retainable || 3260 ACTC == ACTC_coreFoundation || 3261 ACTC == ACTC_voidPtr); 3262 } 3263 3264 static bool isAnyCLike(ARCConversionTypeClass ACTC) { 3265 return ACTC == ACTC_none || 3266 ACTC == ACTC_voidPtr || 3267 ACTC == ACTC_coreFoundation; 3268 } 3269 3270 static ARCConversionTypeClass classifyTypeForARCConversion(QualType type) { 3271 bool isIndirect = false; 3272 3273 // Ignore an outermost reference type. 3274 if (const ReferenceType *ref = type->getAs<ReferenceType>()) { 3275 type = ref->getPointeeType(); 3276 isIndirect = true; 3277 } 3278 3279 // Drill through pointers and arrays recursively. 3280 while (true) { 3281 if (const PointerType *ptr = type->getAs<PointerType>()) { 3282 type = ptr->getPointeeType(); 3283 3284 // The first level of pointer may be the innermost pointer on a CF type. 3285 if (!isIndirect) { 3286 if (type->isVoidType()) return ACTC_voidPtr; 3287 if (type->isRecordType()) return ACTC_coreFoundation; 3288 } 3289 } else if (const ArrayType *array = type->getAsArrayTypeUnsafe()) { 3290 type = QualType(array->getElementType()->getBaseElementTypeUnsafe(), 0); 3291 } else { 3292 break; 3293 } 3294 isIndirect = true; 3295 } 3296 3297 if (isIndirect) { 3298 if (type->isObjCARCBridgableType()) 3299 return ACTC_indirectRetainable; 3300 return ACTC_none; 3301 } 3302 3303 if (type->isObjCARCBridgableType()) 3304 return ACTC_retainable; 3305 3306 return ACTC_none; 3307 } 3308 3309 namespace { 3310 /// A result from the cast checker. 3311 enum ACCResult { 3312 /// Cannot be casted. 3313 ACC_invalid, 3314 3315 /// Can be safely retained or not retained. 3316 ACC_bottom, 3317 3318 /// Can be casted at +0. 3319 ACC_plusZero, 3320 3321 /// Can be casted at +1. 3322 ACC_plusOne 3323 }; 3324 ACCResult merge(ACCResult left, ACCResult right) { 3325 if (left == right) return left; 3326 if (left == ACC_bottom) return right; 3327 if (right == ACC_bottom) return left; 3328 return ACC_invalid; 3329 } 3330 3331 /// A checker which white-lists certain expressions whose conversion 3332 /// to or from retainable type would otherwise be forbidden in ARC. 3333 class ARCCastChecker : public StmtVisitor<ARCCastChecker, ACCResult> { 3334 typedef StmtVisitor<ARCCastChecker, ACCResult> super; 3335 3336 ASTContext &Context; 3337 ARCConversionTypeClass SourceClass; 3338 ARCConversionTypeClass TargetClass; 3339 bool Diagnose; 3340 3341 static bool isCFType(QualType type) { 3342 // Someday this can use ns_bridged. For now, it has to do this. 3343 return type->isCARCBridgableType(); 3344 } 3345 3346 public: 3347 ARCCastChecker(ASTContext &Context, ARCConversionTypeClass source, 3348 ARCConversionTypeClass target, bool diagnose) 3349 : Context(Context), SourceClass(source), TargetClass(target), 3350 Diagnose(diagnose) {} 3351 3352 using super::Visit; 3353 ACCResult Visit(Expr *e) { 3354 return super::Visit(e->IgnoreParens()); 3355 } 3356 3357 ACCResult VisitStmt(Stmt *s) { 3358 return ACC_invalid; 3359 } 3360 3361 /// Null pointer constants can be casted however you please. 3362 ACCResult VisitExpr(Expr *e) { 3363 if (e->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull)) 3364 return ACC_bottom; 3365 return ACC_invalid; 3366 } 3367 3368 /// Objective-C string literals can be safely casted. 3369 ACCResult VisitObjCStringLiteral(ObjCStringLiteral *e) { 3370 // If we're casting to any retainable type, go ahead. Global 3371 // strings are immune to retains, so this is bottom. 3372 if (isAnyRetainable(TargetClass)) return ACC_bottom; 3373 3374 return ACC_invalid; 3375 } 3376 3377 /// Look through certain implicit and explicit casts. 3378 ACCResult VisitCastExpr(CastExpr *e) { 3379 switch (e->getCastKind()) { 3380 case CK_NullToPointer: 3381 return ACC_bottom; 3382 3383 case CK_NoOp: 3384 case CK_LValueToRValue: 3385 case CK_BitCast: 3386 case CK_CPointerToObjCPointerCast: 3387 case CK_BlockPointerToObjCPointerCast: 3388 case CK_AnyPointerToBlockPointerCast: 3389 return Visit(e->getSubExpr()); 3390 3391 default: 3392 return ACC_invalid; 3393 } 3394 } 3395 3396 /// Look through unary extension. 3397 ACCResult VisitUnaryExtension(UnaryOperator *e) { 3398 return Visit(e->getSubExpr()); 3399 } 3400 3401 /// Ignore the LHS of a comma operator. 3402 ACCResult VisitBinComma(BinaryOperator *e) { 3403 return Visit(e->getRHS()); 3404 } 3405 3406 /// Conditional operators are okay if both sides are okay. 3407 ACCResult VisitConditionalOperator(ConditionalOperator *e) { 3408 ACCResult left = Visit(e->getTrueExpr()); 3409 if (left == ACC_invalid) return ACC_invalid; 3410 return merge(left, Visit(e->getFalseExpr())); 3411 } 3412 3413 /// Look through pseudo-objects. 3414 ACCResult VisitPseudoObjectExpr(PseudoObjectExpr *e) { 3415 // If we're getting here, we should always have a result. 3416 return Visit(e->getResultExpr()); 3417 } 3418 3419 /// Statement expressions are okay if their result expression is okay. 3420 ACCResult VisitStmtExpr(StmtExpr *e) { 3421 return Visit(e->getSubStmt()->body_back()); 3422 } 3423 3424 /// Some declaration references are okay. 3425 ACCResult VisitDeclRefExpr(DeclRefExpr *e) { 3426 VarDecl *var = dyn_cast<VarDecl>(e->getDecl()); 3427 // References to global constants are okay. 3428 if (isAnyRetainable(TargetClass) && 3429 isAnyRetainable(SourceClass) && 3430 var && 3431 !var->hasDefinition(Context) && 3432 var->getType().isConstQualified()) { 3433 3434 // In system headers, they can also be assumed to be immune to retains. 3435 // These are things like 'kCFStringTransformToLatin'. 3436 if (Context.getSourceManager().isInSystemHeader(var->getLocation())) 3437 return ACC_bottom; 3438 3439 return ACC_plusZero; 3440 } 3441 3442 // Nothing else. 3443 return ACC_invalid; 3444 } 3445 3446 /// Some calls are okay. 3447 ACCResult VisitCallExpr(CallExpr *e) { 3448 if (FunctionDecl *fn = e->getDirectCallee()) 3449 if (ACCResult result = checkCallToFunction(fn)) 3450 return result; 3451 3452 return super::VisitCallExpr(e); 3453 } 3454 3455 ACCResult checkCallToFunction(FunctionDecl *fn) { 3456 // Require a CF*Ref return type. 3457 if (!isCFType(fn->getReturnType())) 3458 return ACC_invalid; 3459 3460 if (!isAnyRetainable(TargetClass)) 3461 return ACC_invalid; 3462 3463 // Honor an explicit 'not retained' attribute. 3464 if (fn->hasAttr<CFReturnsNotRetainedAttr>()) 3465 return ACC_plusZero; 3466 3467 // Honor an explicit 'retained' attribute, except that for 3468 // now we're not going to permit implicit handling of +1 results, 3469 // because it's a bit frightening. 3470 if (fn->hasAttr<CFReturnsRetainedAttr>()) 3471 return Diagnose ? ACC_plusOne 3472 : ACC_invalid; // ACC_plusOne if we start accepting this 3473 3474 // Recognize this specific builtin function, which is used by CFSTR. 3475 unsigned builtinID = fn->getBuiltinID(); 3476 if (builtinID == Builtin::BI__builtin___CFStringMakeConstantString) 3477 return ACC_bottom; 3478 3479 // Otherwise, don't do anything implicit with an unaudited function. 3480 if (!fn->hasAttr<CFAuditedTransferAttr>()) 3481 return ACC_invalid; 3482 3483 // Otherwise, it's +0 unless it follows the create convention. 3484 if (ento::coreFoundation::followsCreateRule(fn)) 3485 return Diagnose ? ACC_plusOne 3486 : ACC_invalid; // ACC_plusOne if we start accepting this 3487 3488 return ACC_plusZero; 3489 } 3490 3491 ACCResult VisitObjCMessageExpr(ObjCMessageExpr *e) { 3492 return checkCallToMethod(e->getMethodDecl()); 3493 } 3494 3495 ACCResult VisitObjCPropertyRefExpr(ObjCPropertyRefExpr *e) { 3496 ObjCMethodDecl *method; 3497 if (e->isExplicitProperty()) 3498 method = e->getExplicitProperty()->getGetterMethodDecl(); 3499 else 3500 method = e->getImplicitPropertyGetter(); 3501 return checkCallToMethod(method); 3502 } 3503 3504 ACCResult checkCallToMethod(ObjCMethodDecl *method) { 3505 if (!method) return ACC_invalid; 3506 3507 // Check for message sends to functions returning CF types. We 3508 // just obey the Cocoa conventions with these, even though the 3509 // return type is CF. 3510 if (!isAnyRetainable(TargetClass) || !isCFType(method->getReturnType())) 3511 return ACC_invalid; 3512 3513 // If the method is explicitly marked not-retained, it's +0. 3514 if (method->hasAttr<CFReturnsNotRetainedAttr>()) 3515 return ACC_plusZero; 3516 3517 // If the method is explicitly marked as returning retained, or its 3518 // selector follows a +1 Cocoa convention, treat it as +1. 3519 if (method->hasAttr<CFReturnsRetainedAttr>()) 3520 return ACC_plusOne; 3521 3522 switch (method->getSelector().getMethodFamily()) { 3523 case OMF_alloc: 3524 case OMF_copy: 3525 case OMF_mutableCopy: 3526 case OMF_new: 3527 return ACC_plusOne; 3528 3529 default: 3530 // Otherwise, treat it as +0. 3531 return ACC_plusZero; 3532 } 3533 } 3534 }; 3535 } // end anonymous namespace 3536 3537 bool Sema::isKnownName(StringRef name) { 3538 if (name.empty()) 3539 return false; 3540 LookupResult R(*this, &Context.Idents.get(name), SourceLocation(), 3541 Sema::LookupOrdinaryName); 3542 return LookupName(R, TUScope, false); 3543 } 3544 3545 static void addFixitForObjCARCConversion(Sema &S, 3546 DiagnosticBuilder &DiagB, 3547 Sema::CheckedConversionKind CCK, 3548 SourceLocation afterLParen, 3549 QualType castType, 3550 Expr *castExpr, 3551 Expr *realCast, 3552 const char *bridgeKeyword, 3553 const char *CFBridgeName) { 3554 // We handle C-style and implicit casts here. 3555 switch (CCK) { 3556 case Sema::CCK_ImplicitConversion: 3557 case Sema::CCK_ForBuiltinOverloadedOp: 3558 case Sema::CCK_CStyleCast: 3559 case Sema::CCK_OtherCast: 3560 break; 3561 case Sema::CCK_FunctionalCast: 3562 return; 3563 } 3564 3565 if (CFBridgeName) { 3566 if (CCK == Sema::CCK_OtherCast) { 3567 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) { 3568 SourceRange range(NCE->getOperatorLoc(), 3569 NCE->getAngleBrackets().getEnd()); 3570 SmallString<32> BridgeCall; 3571 3572 SourceManager &SM = S.getSourceManager(); 3573 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1)); 3574 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts())) 3575 BridgeCall += ' '; 3576 3577 BridgeCall += CFBridgeName; 3578 DiagB.AddFixItHint(FixItHint::CreateReplacement(range, BridgeCall)); 3579 } 3580 return; 3581 } 3582 Expr *castedE = castExpr; 3583 if (CStyleCastExpr *CCE = dyn_cast<CStyleCastExpr>(castedE)) 3584 castedE = CCE->getSubExpr(); 3585 castedE = castedE->IgnoreImpCasts(); 3586 SourceRange range = castedE->getSourceRange(); 3587 3588 SmallString<32> BridgeCall; 3589 3590 SourceManager &SM = S.getSourceManager(); 3591 char PrevChar = *SM.getCharacterData(range.getBegin().getLocWithOffset(-1)); 3592 if (Lexer::isIdentifierBodyChar(PrevChar, S.getLangOpts())) 3593 BridgeCall += ' '; 3594 3595 BridgeCall += CFBridgeName; 3596 3597 if (isa<ParenExpr>(castedE)) { 3598 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(), 3599 BridgeCall)); 3600 } else { 3601 BridgeCall += '('; 3602 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(), 3603 BridgeCall)); 3604 DiagB.AddFixItHint(FixItHint::CreateInsertion( 3605 S.getLocForEndOfToken(range.getEnd()), 3606 ")")); 3607 } 3608 return; 3609 } 3610 3611 if (CCK == Sema::CCK_CStyleCast) { 3612 DiagB.AddFixItHint(FixItHint::CreateInsertion(afterLParen, bridgeKeyword)); 3613 } else if (CCK == Sema::CCK_OtherCast) { 3614 if (const CXXNamedCastExpr *NCE = dyn_cast<CXXNamedCastExpr>(realCast)) { 3615 std::string castCode = "("; 3616 castCode += bridgeKeyword; 3617 castCode += castType.getAsString(); 3618 castCode += ")"; 3619 SourceRange Range(NCE->getOperatorLoc(), 3620 NCE->getAngleBrackets().getEnd()); 3621 DiagB.AddFixItHint(FixItHint::CreateReplacement(Range, castCode)); 3622 } 3623 } else { 3624 std::string castCode = "("; 3625 castCode += bridgeKeyword; 3626 castCode += castType.getAsString(); 3627 castCode += ")"; 3628 Expr *castedE = castExpr->IgnoreImpCasts(); 3629 SourceRange range = castedE->getSourceRange(); 3630 if (isa<ParenExpr>(castedE)) { 3631 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(), 3632 castCode)); 3633 } else { 3634 castCode += "("; 3635 DiagB.AddFixItHint(FixItHint::CreateInsertion(range.getBegin(), 3636 castCode)); 3637 DiagB.AddFixItHint(FixItHint::CreateInsertion( 3638 S.getLocForEndOfToken(range.getEnd()), 3639 ")")); 3640 } 3641 } 3642 } 3643 3644 template <typename T> 3645 static inline T *getObjCBridgeAttr(const TypedefType *TD) { 3646 TypedefNameDecl *TDNDecl = TD->getDecl(); 3647 QualType QT = TDNDecl->getUnderlyingType(); 3648 if (QT->isPointerType()) { 3649 QT = QT->getPointeeType(); 3650 if (const RecordType *RT = QT->getAs<RecordType>()) 3651 if (RecordDecl *RD = RT->getDecl()->getMostRecentDecl()) 3652 return RD->getAttr<T>(); 3653 } 3654 return nullptr; 3655 } 3656 3657 static ObjCBridgeRelatedAttr *ObjCBridgeRelatedAttrFromType(QualType T, 3658 TypedefNameDecl *&TDNDecl) { 3659 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) { 3660 TDNDecl = TD->getDecl(); 3661 if (ObjCBridgeRelatedAttr *ObjCBAttr = 3662 getObjCBridgeAttr<ObjCBridgeRelatedAttr>(TD)) 3663 return ObjCBAttr; 3664 T = TDNDecl->getUnderlyingType(); 3665 } 3666 return nullptr; 3667 } 3668 3669 static void 3670 diagnoseObjCARCConversion(Sema &S, SourceRange castRange, 3671 QualType castType, ARCConversionTypeClass castACTC, 3672 Expr *castExpr, Expr *realCast, 3673 ARCConversionTypeClass exprACTC, 3674 Sema::CheckedConversionKind CCK) { 3675 SourceLocation loc = 3676 (castRange.isValid() ? castRange.getBegin() : castExpr->getExprLoc()); 3677 3678 if (S.makeUnavailableInSystemHeader(loc, 3679 UnavailableAttr::IR_ARCForbiddenConversion)) 3680 return; 3681 3682 QualType castExprType = castExpr->getType(); 3683 // Defer emitting a diagnostic for bridge-related casts; that will be 3684 // handled by CheckObjCBridgeRelatedConversions. 3685 TypedefNameDecl *TDNDecl = nullptr; 3686 if ((castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable && 3687 ObjCBridgeRelatedAttrFromType(castType, TDNDecl)) || 3688 (exprACTC == ACTC_coreFoundation && castACTC == ACTC_retainable && 3689 ObjCBridgeRelatedAttrFromType(castExprType, TDNDecl))) 3690 return; 3691 3692 unsigned srcKind = 0; 3693 switch (exprACTC) { 3694 case ACTC_none: 3695 case ACTC_coreFoundation: 3696 case ACTC_voidPtr: 3697 srcKind = (castExprType->isPointerType() ? 1 : 0); 3698 break; 3699 case ACTC_retainable: 3700 srcKind = (castExprType->isBlockPointerType() ? 2 : 3); 3701 break; 3702 case ACTC_indirectRetainable: 3703 srcKind = 4; 3704 break; 3705 } 3706 3707 // Check whether this could be fixed with a bridge cast. 3708 SourceLocation afterLParen = S.getLocForEndOfToken(castRange.getBegin()); 3709 SourceLocation noteLoc = afterLParen.isValid() ? afterLParen : loc; 3710 3711 unsigned convKindForDiag = Sema::isCast(CCK) ? 0 : 1; 3712 3713 // Bridge from an ARC type to a CF type. 3714 if (castACTC == ACTC_retainable && isAnyRetainable(exprACTC)) { 3715 3716 S.Diag(loc, diag::err_arc_cast_requires_bridge) 3717 << convKindForDiag 3718 << 2 // of C pointer type 3719 << castExprType 3720 << unsigned(castType->isBlockPointerType()) // to ObjC|block type 3721 << castType 3722 << castRange 3723 << castExpr->getSourceRange(); 3724 bool br = S.isKnownName("CFBridgingRelease"); 3725 ACCResult CreateRule = 3726 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr); 3727 assert(CreateRule != ACC_bottom && "This cast should already be accepted."); 3728 if (CreateRule != ACC_plusOne) 3729 { 3730 DiagnosticBuilder DiagB = 3731 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge) 3732 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge); 3733 3734 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen, 3735 castType, castExpr, realCast, "__bridge ", 3736 nullptr); 3737 } 3738 if (CreateRule != ACC_plusZero) 3739 { 3740 DiagnosticBuilder DiagB = 3741 (CCK == Sema::CCK_OtherCast && !br) ? 3742 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_transfer) << castExprType : 3743 S.Diag(br ? castExpr->getExprLoc() : noteLoc, 3744 diag::note_arc_bridge_transfer) 3745 << castExprType << br; 3746 3747 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen, 3748 castType, castExpr, realCast, "__bridge_transfer ", 3749 br ? "CFBridgingRelease" : nullptr); 3750 } 3751 3752 return; 3753 } 3754 3755 // Bridge from a CF type to an ARC type. 3756 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC)) { 3757 bool br = S.isKnownName("CFBridgingRetain"); 3758 S.Diag(loc, diag::err_arc_cast_requires_bridge) 3759 << convKindForDiag 3760 << unsigned(castExprType->isBlockPointerType()) // of ObjC|block type 3761 << castExprType 3762 << 2 // to C pointer type 3763 << castType 3764 << castRange 3765 << castExpr->getSourceRange(); 3766 ACCResult CreateRule = 3767 ARCCastChecker(S.Context, exprACTC, castACTC, true).Visit(castExpr); 3768 assert(CreateRule != ACC_bottom && "This cast should already be accepted."); 3769 if (CreateRule != ACC_plusOne) 3770 { 3771 DiagnosticBuilder DiagB = 3772 (CCK != Sema::CCK_OtherCast) ? S.Diag(noteLoc, diag::note_arc_bridge) 3773 : S.Diag(noteLoc, diag::note_arc_cstyle_bridge); 3774 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen, 3775 castType, castExpr, realCast, "__bridge ", 3776 nullptr); 3777 } 3778 if (CreateRule != ACC_plusZero) 3779 { 3780 DiagnosticBuilder DiagB = 3781 (CCK == Sema::CCK_OtherCast && !br) ? 3782 S.Diag(noteLoc, diag::note_arc_cstyle_bridge_retained) << castType : 3783 S.Diag(br ? castExpr->getExprLoc() : noteLoc, 3784 diag::note_arc_bridge_retained) 3785 << castType << br; 3786 3787 addFixitForObjCARCConversion(S, DiagB, CCK, afterLParen, 3788 castType, castExpr, realCast, "__bridge_retained ", 3789 br ? "CFBridgingRetain" : nullptr); 3790 } 3791 3792 return; 3793 } 3794 3795 S.Diag(loc, diag::err_arc_mismatched_cast) 3796 << !convKindForDiag 3797 << srcKind << castExprType << castType 3798 << castRange << castExpr->getSourceRange(); 3799 } 3800 3801 template <typename TB> 3802 static bool CheckObjCBridgeNSCast(Sema &S, QualType castType, Expr *castExpr, 3803 bool &HadTheAttribute, bool warn) { 3804 QualType T = castExpr->getType(); 3805 HadTheAttribute = false; 3806 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) { 3807 TypedefNameDecl *TDNDecl = TD->getDecl(); 3808 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) { 3809 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) { 3810 HadTheAttribute = true; 3811 if (Parm->isStr("id")) 3812 return true; 3813 3814 NamedDecl *Target = nullptr; 3815 // Check for an existing type with this name. 3816 LookupResult R(S, DeclarationName(Parm), SourceLocation(), 3817 Sema::LookupOrdinaryName); 3818 if (S.LookupName(R, S.TUScope)) { 3819 Target = R.getFoundDecl(); 3820 if (Target && isa<ObjCInterfaceDecl>(Target)) { 3821 ObjCInterfaceDecl *ExprClass = cast<ObjCInterfaceDecl>(Target); 3822 if (const ObjCObjectPointerType *InterfacePointerType = 3823 castType->getAsObjCInterfacePointerType()) { 3824 ObjCInterfaceDecl *CastClass 3825 = InterfacePointerType->getObjectType()->getInterface(); 3826 if ((CastClass == ExprClass) || 3827 (CastClass && CastClass->isSuperClassOf(ExprClass))) 3828 return true; 3829 if (warn) 3830 S.Diag(castExpr->getBeginLoc(), diag::warn_objc_invalid_bridge) 3831 << T << Target->getName() << castType->getPointeeType(); 3832 return false; 3833 } else if (castType->isObjCIdType() || 3834 (S.Context.ObjCObjectAdoptsQTypeProtocols( 3835 castType, ExprClass))) 3836 // ok to cast to 'id'. 3837 // casting to id<p-list> is ok if bridge type adopts all of 3838 // p-list protocols. 3839 return true; 3840 else { 3841 if (warn) { 3842 S.Diag(castExpr->getBeginLoc(), diag::warn_objc_invalid_bridge) 3843 << T << Target->getName() << castType; 3844 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 3845 S.Diag(Target->getBeginLoc(), diag::note_declared_at); 3846 } 3847 return false; 3848 } 3849 } 3850 } else if (!castType->isObjCIdType()) { 3851 S.Diag(castExpr->getBeginLoc(), 3852 diag::err_objc_cf_bridged_not_interface) 3853 << castExpr->getType() << Parm; 3854 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 3855 if (Target) 3856 S.Diag(Target->getBeginLoc(), diag::note_declared_at); 3857 } 3858 return true; 3859 } 3860 return false; 3861 } 3862 T = TDNDecl->getUnderlyingType(); 3863 } 3864 return true; 3865 } 3866 3867 template <typename TB> 3868 static bool CheckObjCBridgeCFCast(Sema &S, QualType castType, Expr *castExpr, 3869 bool &HadTheAttribute, bool warn) { 3870 QualType T = castType; 3871 HadTheAttribute = false; 3872 while (const TypedefType *TD = dyn_cast<TypedefType>(T.getTypePtr())) { 3873 TypedefNameDecl *TDNDecl = TD->getDecl(); 3874 if (TB *ObjCBAttr = getObjCBridgeAttr<TB>(TD)) { 3875 if (IdentifierInfo *Parm = ObjCBAttr->getBridgedType()) { 3876 HadTheAttribute = true; 3877 if (Parm->isStr("id")) 3878 return true; 3879 3880 NamedDecl *Target = nullptr; 3881 // Check for an existing type with this name. 3882 LookupResult R(S, DeclarationName(Parm), SourceLocation(), 3883 Sema::LookupOrdinaryName); 3884 if (S.LookupName(R, S.TUScope)) { 3885 Target = R.getFoundDecl(); 3886 if (Target && isa<ObjCInterfaceDecl>(Target)) { 3887 ObjCInterfaceDecl *CastClass = cast<ObjCInterfaceDecl>(Target); 3888 if (const ObjCObjectPointerType *InterfacePointerType = 3889 castExpr->getType()->getAsObjCInterfacePointerType()) { 3890 ObjCInterfaceDecl *ExprClass 3891 = InterfacePointerType->getObjectType()->getInterface(); 3892 if ((CastClass == ExprClass) || 3893 (ExprClass && CastClass->isSuperClassOf(ExprClass))) 3894 return true; 3895 if (warn) { 3896 S.Diag(castExpr->getBeginLoc(), 3897 diag::warn_objc_invalid_bridge_to_cf) 3898 << castExpr->getType()->getPointeeType() << T; 3899 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 3900 } 3901 return false; 3902 } else if (castExpr->getType()->isObjCIdType() || 3903 (S.Context.QIdProtocolsAdoptObjCObjectProtocols( 3904 castExpr->getType(), CastClass))) 3905 // ok to cast an 'id' expression to a CFtype. 3906 // ok to cast an 'id<plist>' expression to CFtype provided plist 3907 // adopts all of CFtype's ObjetiveC's class plist. 3908 return true; 3909 else { 3910 if (warn) { 3911 S.Diag(castExpr->getBeginLoc(), 3912 diag::warn_objc_invalid_bridge_to_cf) 3913 << castExpr->getType() << castType; 3914 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 3915 S.Diag(Target->getBeginLoc(), diag::note_declared_at); 3916 } 3917 return false; 3918 } 3919 } 3920 } 3921 S.Diag(castExpr->getBeginLoc(), 3922 diag::err_objc_ns_bridged_invalid_cfobject) 3923 << castExpr->getType() << castType; 3924 S.Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 3925 if (Target) 3926 S.Diag(Target->getBeginLoc(), diag::note_declared_at); 3927 return true; 3928 } 3929 return false; 3930 } 3931 T = TDNDecl->getUnderlyingType(); 3932 } 3933 return true; 3934 } 3935 3936 void Sema::CheckTollFreeBridgeCast(QualType castType, Expr *castExpr) { 3937 if (!getLangOpts().ObjC) 3938 return; 3939 // warn in presence of __bridge casting to or from a toll free bridge cast. 3940 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExpr->getType()); 3941 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType); 3942 if (castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) { 3943 bool HasObjCBridgeAttr; 3944 bool ObjCBridgeAttrWillNotWarn = 3945 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr, 3946 false); 3947 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr) 3948 return; 3949 bool HasObjCBridgeMutableAttr; 3950 bool ObjCBridgeMutableAttrWillNotWarn = 3951 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr, 3952 HasObjCBridgeMutableAttr, false); 3953 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr) 3954 return; 3955 3956 if (HasObjCBridgeAttr) 3957 CheckObjCBridgeNSCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr, 3958 true); 3959 else if (HasObjCBridgeMutableAttr) 3960 CheckObjCBridgeNSCast<ObjCBridgeMutableAttr>(*this, castType, castExpr, 3961 HasObjCBridgeMutableAttr, true); 3962 } 3963 else if (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable) { 3964 bool HasObjCBridgeAttr; 3965 bool ObjCBridgeAttrWillNotWarn = 3966 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr, 3967 false); 3968 if (ObjCBridgeAttrWillNotWarn && HasObjCBridgeAttr) 3969 return; 3970 bool HasObjCBridgeMutableAttr; 3971 bool ObjCBridgeMutableAttrWillNotWarn = 3972 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr, 3973 HasObjCBridgeMutableAttr, false); 3974 if (ObjCBridgeMutableAttrWillNotWarn && HasObjCBridgeMutableAttr) 3975 return; 3976 3977 if (HasObjCBridgeAttr) 3978 CheckObjCBridgeCFCast<ObjCBridgeAttr>(*this, castType, castExpr, HasObjCBridgeAttr, 3979 true); 3980 else if (HasObjCBridgeMutableAttr) 3981 CheckObjCBridgeCFCast<ObjCBridgeMutableAttr>(*this, castType, castExpr, 3982 HasObjCBridgeMutableAttr, true); 3983 } 3984 } 3985 3986 void Sema::CheckObjCBridgeRelatedCast(QualType castType, Expr *castExpr) { 3987 QualType SrcType = castExpr->getType(); 3988 if (ObjCPropertyRefExpr *PRE = dyn_cast<ObjCPropertyRefExpr>(castExpr)) { 3989 if (PRE->isExplicitProperty()) { 3990 if (ObjCPropertyDecl *PDecl = PRE->getExplicitProperty()) 3991 SrcType = PDecl->getType(); 3992 } 3993 else if (PRE->isImplicitProperty()) { 3994 if (ObjCMethodDecl *Getter = PRE->getImplicitPropertyGetter()) 3995 SrcType = Getter->getReturnType(); 3996 } 3997 } 3998 3999 ARCConversionTypeClass srcExprACTC = classifyTypeForARCConversion(SrcType); 4000 ARCConversionTypeClass castExprACTC = classifyTypeForARCConversion(castType); 4001 if (srcExprACTC != ACTC_retainable || castExprACTC != ACTC_coreFoundation) 4002 return; 4003 CheckObjCBridgeRelatedConversions(castExpr->getBeginLoc(), castType, SrcType, 4004 castExpr); 4005 } 4006 4007 bool Sema::CheckTollFreeBridgeStaticCast(QualType castType, Expr *castExpr, 4008 CastKind &Kind) { 4009 if (!getLangOpts().ObjC) 4010 return false; 4011 ARCConversionTypeClass exprACTC = 4012 classifyTypeForARCConversion(castExpr->getType()); 4013 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(castType); 4014 if ((castACTC == ACTC_retainable && exprACTC == ACTC_coreFoundation) || 4015 (castACTC == ACTC_coreFoundation && exprACTC == ACTC_retainable)) { 4016 CheckTollFreeBridgeCast(castType, castExpr); 4017 Kind = (castACTC == ACTC_coreFoundation) ? CK_BitCast 4018 : CK_CPointerToObjCPointerCast; 4019 return true; 4020 } 4021 return false; 4022 } 4023 4024 bool Sema::checkObjCBridgeRelatedComponents(SourceLocation Loc, 4025 QualType DestType, QualType SrcType, 4026 ObjCInterfaceDecl *&RelatedClass, 4027 ObjCMethodDecl *&ClassMethod, 4028 ObjCMethodDecl *&InstanceMethod, 4029 TypedefNameDecl *&TDNDecl, 4030 bool CfToNs, bool Diagnose) { 4031 QualType T = CfToNs ? SrcType : DestType; 4032 ObjCBridgeRelatedAttr *ObjCBAttr = ObjCBridgeRelatedAttrFromType(T, TDNDecl); 4033 if (!ObjCBAttr) 4034 return false; 4035 4036 IdentifierInfo *RCId = ObjCBAttr->getRelatedClass(); 4037 IdentifierInfo *CMId = ObjCBAttr->getClassMethod(); 4038 IdentifierInfo *IMId = ObjCBAttr->getInstanceMethod(); 4039 if (!RCId) 4040 return false; 4041 NamedDecl *Target = nullptr; 4042 // Check for an existing type with this name. 4043 LookupResult R(*this, DeclarationName(RCId), SourceLocation(), 4044 Sema::LookupOrdinaryName); 4045 if (!LookupName(R, TUScope)) { 4046 if (Diagnose) { 4047 Diag(Loc, diag::err_objc_bridged_related_invalid_class) << RCId 4048 << SrcType << DestType; 4049 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 4050 } 4051 return false; 4052 } 4053 Target = R.getFoundDecl(); 4054 if (Target && isa<ObjCInterfaceDecl>(Target)) 4055 RelatedClass = cast<ObjCInterfaceDecl>(Target); 4056 else { 4057 if (Diagnose) { 4058 Diag(Loc, diag::err_objc_bridged_related_invalid_class_name) << RCId 4059 << SrcType << DestType; 4060 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 4061 if (Target) 4062 Diag(Target->getBeginLoc(), diag::note_declared_at); 4063 } 4064 return false; 4065 } 4066 4067 // Check for an existing class method with the given selector name. 4068 if (CfToNs && CMId) { 4069 Selector Sel = Context.Selectors.getUnarySelector(CMId); 4070 ClassMethod = RelatedClass->lookupMethod(Sel, false); 4071 if (!ClassMethod) { 4072 if (Diagnose) { 4073 Diag(Loc, diag::err_objc_bridged_related_known_method) 4074 << SrcType << DestType << Sel << false; 4075 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 4076 } 4077 return false; 4078 } 4079 } 4080 4081 // Check for an existing instance method with the given selector name. 4082 if (!CfToNs && IMId) { 4083 Selector Sel = Context.Selectors.getNullarySelector(IMId); 4084 InstanceMethod = RelatedClass->lookupMethod(Sel, true); 4085 if (!InstanceMethod) { 4086 if (Diagnose) { 4087 Diag(Loc, diag::err_objc_bridged_related_known_method) 4088 << SrcType << DestType << Sel << true; 4089 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 4090 } 4091 return false; 4092 } 4093 } 4094 return true; 4095 } 4096 4097 bool 4098 Sema::CheckObjCBridgeRelatedConversions(SourceLocation Loc, 4099 QualType DestType, QualType SrcType, 4100 Expr *&SrcExpr, bool Diagnose) { 4101 ARCConversionTypeClass rhsExprACTC = classifyTypeForARCConversion(SrcType); 4102 ARCConversionTypeClass lhsExprACTC = classifyTypeForARCConversion(DestType); 4103 bool CfToNs = (rhsExprACTC == ACTC_coreFoundation && lhsExprACTC == ACTC_retainable); 4104 bool NsToCf = (rhsExprACTC == ACTC_retainable && lhsExprACTC == ACTC_coreFoundation); 4105 if (!CfToNs && !NsToCf) 4106 return false; 4107 4108 ObjCInterfaceDecl *RelatedClass; 4109 ObjCMethodDecl *ClassMethod = nullptr; 4110 ObjCMethodDecl *InstanceMethod = nullptr; 4111 TypedefNameDecl *TDNDecl = nullptr; 4112 if (!checkObjCBridgeRelatedComponents(Loc, DestType, SrcType, RelatedClass, 4113 ClassMethod, InstanceMethod, TDNDecl, 4114 CfToNs, Diagnose)) 4115 return false; 4116 4117 if (CfToNs) { 4118 // Implicit conversion from CF to ObjC object is needed. 4119 if (ClassMethod) { 4120 if (Diagnose) { 4121 std::string ExpressionString = "["; 4122 ExpressionString += RelatedClass->getNameAsString(); 4123 ExpressionString += " "; 4124 ExpressionString += ClassMethod->getSelector().getAsString(); 4125 SourceLocation SrcExprEndLoc = 4126 getLocForEndOfToken(SrcExpr->getEndLoc()); 4127 // Provide a fixit: [RelatedClass ClassMethod SrcExpr] 4128 Diag(Loc, diag::err_objc_bridged_related_known_method) 4129 << SrcType << DestType << ClassMethod->getSelector() << false 4130 << FixItHint::CreateInsertion(SrcExpr->getBeginLoc(), 4131 ExpressionString) 4132 << FixItHint::CreateInsertion(SrcExprEndLoc, "]"); 4133 Diag(RelatedClass->getBeginLoc(), diag::note_declared_at); 4134 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 4135 4136 QualType receiverType = Context.getObjCInterfaceType(RelatedClass); 4137 // Argument. 4138 Expr *args[] = { SrcExpr }; 4139 ExprResult msg = BuildClassMessageImplicit(receiverType, false, 4140 ClassMethod->getLocation(), 4141 ClassMethod->getSelector(), ClassMethod, 4142 MultiExprArg(args, 1)); 4143 SrcExpr = msg.get(); 4144 } 4145 return true; 4146 } 4147 } 4148 else { 4149 // Implicit conversion from ObjC type to CF object is needed. 4150 if (InstanceMethod) { 4151 if (Diagnose) { 4152 std::string ExpressionString; 4153 SourceLocation SrcExprEndLoc = 4154 getLocForEndOfToken(SrcExpr->getEndLoc()); 4155 if (InstanceMethod->isPropertyAccessor()) 4156 if (const ObjCPropertyDecl *PDecl = 4157 InstanceMethod->findPropertyDecl()) { 4158 // fixit: ObjectExpr.propertyname when it is aproperty accessor. 4159 ExpressionString = "."; 4160 ExpressionString += PDecl->getNameAsString(); 4161 Diag(Loc, diag::err_objc_bridged_related_known_method) 4162 << SrcType << DestType << InstanceMethod->getSelector() << true 4163 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString); 4164 } 4165 if (ExpressionString.empty()) { 4166 // Provide a fixit: [ObjectExpr InstanceMethod] 4167 ExpressionString = " "; 4168 ExpressionString += InstanceMethod->getSelector().getAsString(); 4169 ExpressionString += "]"; 4170 4171 Diag(Loc, diag::err_objc_bridged_related_known_method) 4172 << SrcType << DestType << InstanceMethod->getSelector() << true 4173 << FixItHint::CreateInsertion(SrcExpr->getBeginLoc(), "[") 4174 << FixItHint::CreateInsertion(SrcExprEndLoc, ExpressionString); 4175 } 4176 Diag(RelatedClass->getBeginLoc(), diag::note_declared_at); 4177 Diag(TDNDecl->getBeginLoc(), diag::note_declared_at); 4178 4179 ExprResult msg = 4180 BuildInstanceMessageImplicit(SrcExpr, SrcType, 4181 InstanceMethod->getLocation(), 4182 InstanceMethod->getSelector(), 4183 InstanceMethod, None); 4184 SrcExpr = msg.get(); 4185 } 4186 return true; 4187 } 4188 } 4189 return false; 4190 } 4191 4192 Sema::ARCConversionResult 4193 Sema::CheckObjCConversion(SourceRange castRange, QualType castType, 4194 Expr *&castExpr, CheckedConversionKind CCK, 4195 bool Diagnose, bool DiagnoseCFAudited, 4196 BinaryOperatorKind Opc) { 4197 QualType castExprType = castExpr->getType(); 4198 4199 // For the purposes of the classification, we assume reference types 4200 // will bind to temporaries. 4201 QualType effCastType = castType; 4202 if (const ReferenceType *ref = castType->getAs<ReferenceType>()) 4203 effCastType = ref->getPointeeType(); 4204 4205 ARCConversionTypeClass exprACTC = classifyTypeForARCConversion(castExprType); 4206 ARCConversionTypeClass castACTC = classifyTypeForARCConversion(effCastType); 4207 if (exprACTC == castACTC) { 4208 // Check for viability and report error if casting an rvalue to a 4209 // life-time qualifier. 4210 if (castACTC == ACTC_retainable && 4211 (CCK == CCK_CStyleCast || CCK == CCK_OtherCast) && 4212 castType != castExprType) { 4213 const Type *DT = castType.getTypePtr(); 4214 QualType QDT = castType; 4215 // We desugar some types but not others. We ignore those 4216 // that cannot happen in a cast; i.e. auto, and those which 4217 // should not be de-sugared; i.e typedef. 4218 if (const ParenType *PT = dyn_cast<ParenType>(DT)) 4219 QDT = PT->desugar(); 4220 else if (const TypeOfType *TP = dyn_cast<TypeOfType>(DT)) 4221 QDT = TP->desugar(); 4222 else if (const AttributedType *AT = dyn_cast<AttributedType>(DT)) 4223 QDT = AT->desugar(); 4224 if (QDT != castType && 4225 QDT.getObjCLifetime() != Qualifiers::OCL_None) { 4226 if (Diagnose) { 4227 SourceLocation loc = (castRange.isValid() ? castRange.getBegin() 4228 : castExpr->getExprLoc()); 4229 Diag(loc, diag::err_arc_nolifetime_behavior); 4230 } 4231 return ACR_error; 4232 } 4233 } 4234 return ACR_okay; 4235 } 4236 4237 // The life-time qualifier cast check above is all we need for ObjCWeak. 4238 // ObjCAutoRefCount has more restrictions on what is legal. 4239 if (!getLangOpts().ObjCAutoRefCount) 4240 return ACR_okay; 4241 4242 if (isAnyCLike(exprACTC) && isAnyCLike(castACTC)) return ACR_okay; 4243 4244 // Allow all of these types to be cast to integer types (but not 4245 // vice-versa). 4246 if (castACTC == ACTC_none && castType->isIntegralType(Context)) 4247 return ACR_okay; 4248 4249 // Allow casts between pointers to lifetime types (e.g., __strong id*) 4250 // and pointers to void (e.g., cv void *). Casting from void* to lifetime* 4251 // must be explicit. 4252 if (exprACTC == ACTC_indirectRetainable && castACTC == ACTC_voidPtr) 4253 return ACR_okay; 4254 if (castACTC == ACTC_indirectRetainable && exprACTC == ACTC_voidPtr && 4255 isCast(CCK)) 4256 return ACR_okay; 4257 4258 switch (ARCCastChecker(Context, exprACTC, castACTC, false).Visit(castExpr)) { 4259 // For invalid casts, fall through. 4260 case ACC_invalid: 4261 break; 4262 4263 // Do nothing for both bottom and +0. 4264 case ACC_bottom: 4265 case ACC_plusZero: 4266 return ACR_okay; 4267 4268 // If the result is +1, consume it here. 4269 case ACC_plusOne: 4270 castExpr = ImplicitCastExpr::Create(Context, castExpr->getType(), 4271 CK_ARCConsumeObject, castExpr, 4272 nullptr, VK_RValue); 4273 Cleanup.setExprNeedsCleanups(true); 4274 return ACR_okay; 4275 } 4276 4277 // If this is a non-implicit cast from id or block type to a 4278 // CoreFoundation type, delay complaining in case the cast is used 4279 // in an acceptable context. 4280 if (exprACTC == ACTC_retainable && isAnyRetainable(castACTC) && isCast(CCK)) 4281 return ACR_unbridged; 4282 4283 // Issue a diagnostic about a missing @-sign when implicit casting a cstring 4284 // to 'NSString *', instead of falling through to report a "bridge cast" 4285 // diagnostic. 4286 if (castACTC == ACTC_retainable && exprACTC == ACTC_none && 4287 ConversionToObjCStringLiteralCheck(castType, castExpr, Diagnose)) 4288 return ACR_error; 4289 4290 // Do not issue "bridge cast" diagnostic when implicit casting 4291 // a retainable object to a CF type parameter belonging to an audited 4292 // CF API function. Let caller issue a normal type mismatched diagnostic 4293 // instead. 4294 if ((!DiagnoseCFAudited || exprACTC != ACTC_retainable || 4295 castACTC != ACTC_coreFoundation) && 4296 !(exprACTC == ACTC_voidPtr && castACTC == ACTC_retainable && 4297 (Opc == BO_NE || Opc == BO_EQ))) { 4298 if (Diagnose) 4299 diagnoseObjCARCConversion(*this, castRange, castType, castACTC, castExpr, 4300 castExpr, exprACTC, CCK); 4301 return ACR_error; 4302 } 4303 return ACR_okay; 4304 } 4305 4306 /// Given that we saw an expression with the ARCUnbridgedCastTy 4307 /// placeholder type, complain bitterly. 4308 void Sema::diagnoseARCUnbridgedCast(Expr *e) { 4309 // We expect the spurious ImplicitCastExpr to already have been stripped. 4310 assert(!e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)); 4311 CastExpr *realCast = cast<CastExpr>(e->IgnoreParens()); 4312 4313 SourceRange castRange; 4314 QualType castType; 4315 CheckedConversionKind CCK; 4316 4317 if (CStyleCastExpr *cast = dyn_cast<CStyleCastExpr>(realCast)) { 4318 castRange = SourceRange(cast->getLParenLoc(), cast->getRParenLoc()); 4319 castType = cast->getTypeAsWritten(); 4320 CCK = CCK_CStyleCast; 4321 } else if (ExplicitCastExpr *cast = dyn_cast<ExplicitCastExpr>(realCast)) { 4322 castRange = cast->getTypeInfoAsWritten()->getTypeLoc().getSourceRange(); 4323 castType = cast->getTypeAsWritten(); 4324 CCK = CCK_OtherCast; 4325 } else { 4326 llvm_unreachable("Unexpected ImplicitCastExpr"); 4327 } 4328 4329 ARCConversionTypeClass castACTC = 4330 classifyTypeForARCConversion(castType.getNonReferenceType()); 4331 4332 Expr *castExpr = realCast->getSubExpr(); 4333 assert(classifyTypeForARCConversion(castExpr->getType()) == ACTC_retainable); 4334 4335 diagnoseObjCARCConversion(*this, castRange, castType, castACTC, 4336 castExpr, realCast, ACTC_retainable, CCK); 4337 } 4338 4339 /// stripARCUnbridgedCast - Given an expression of ARCUnbridgedCast 4340 /// type, remove the placeholder cast. 4341 Expr *Sema::stripARCUnbridgedCast(Expr *e) { 4342 assert(e->hasPlaceholderType(BuiltinType::ARCUnbridgedCast)); 4343 4344 if (ParenExpr *pe = dyn_cast<ParenExpr>(e)) { 4345 Expr *sub = stripARCUnbridgedCast(pe->getSubExpr()); 4346 return new (Context) ParenExpr(pe->getLParen(), pe->getRParen(), sub); 4347 } else if (UnaryOperator *uo = dyn_cast<UnaryOperator>(e)) { 4348 assert(uo->getOpcode() == UO_Extension); 4349 Expr *sub = stripARCUnbridgedCast(uo->getSubExpr()); 4350 return new (Context) 4351 UnaryOperator(sub, UO_Extension, sub->getType(), sub->getValueKind(), 4352 sub->getObjectKind(), uo->getOperatorLoc(), false); 4353 } else if (GenericSelectionExpr *gse = dyn_cast<GenericSelectionExpr>(e)) { 4354 assert(!gse->isResultDependent()); 4355 4356 unsigned n = gse->getNumAssocs(); 4357 SmallVector<Expr *, 4> subExprs; 4358 SmallVector<TypeSourceInfo *, 4> subTypes; 4359 subExprs.reserve(n); 4360 subTypes.reserve(n); 4361 for (const GenericSelectionExpr::Association &assoc : gse->associations()) { 4362 subTypes.push_back(assoc.getTypeSourceInfo()); 4363 Expr *sub = assoc.getAssociationExpr(); 4364 if (assoc.isSelected()) 4365 sub = stripARCUnbridgedCast(sub); 4366 subExprs.push_back(sub); 4367 } 4368 4369 return GenericSelectionExpr::Create( 4370 Context, gse->getGenericLoc(), gse->getControllingExpr(), subTypes, 4371 subExprs, gse->getDefaultLoc(), gse->getRParenLoc(), 4372 gse->containsUnexpandedParameterPack(), gse->getResultIndex()); 4373 } else { 4374 assert(isa<ImplicitCastExpr>(e) && "bad form of unbridged cast!"); 4375 return cast<ImplicitCastExpr>(e)->getSubExpr(); 4376 } 4377 } 4378 4379 bool Sema::CheckObjCARCUnavailableWeakConversion(QualType castType, 4380 QualType exprType) { 4381 QualType canCastType = 4382 Context.getCanonicalType(castType).getUnqualifiedType(); 4383 QualType canExprType = 4384 Context.getCanonicalType(exprType).getUnqualifiedType(); 4385 if (isa<ObjCObjectPointerType>(canCastType) && 4386 castType.getObjCLifetime() == Qualifiers::OCL_Weak && 4387 canExprType->isObjCObjectPointerType()) { 4388 if (const ObjCObjectPointerType *ObjT = 4389 canExprType->getAs<ObjCObjectPointerType>()) 4390 if (const ObjCInterfaceDecl *ObjI = ObjT->getInterfaceDecl()) 4391 return !ObjI->isArcWeakrefUnavailable(); 4392 } 4393 return true; 4394 } 4395 4396 /// Look for an ObjCReclaimReturnedObject cast and destroy it. 4397 static Expr *maybeUndoReclaimObject(Expr *e) { 4398 Expr *curExpr = e, *prevExpr = nullptr; 4399 4400 // Walk down the expression until we hit an implicit cast of kind 4401 // ARCReclaimReturnedObject or an Expr that is neither a Paren nor a Cast. 4402 while (true) { 4403 if (auto *pe = dyn_cast<ParenExpr>(curExpr)) { 4404 prevExpr = curExpr; 4405 curExpr = pe->getSubExpr(); 4406 continue; 4407 } 4408 4409 if (auto *ce = dyn_cast<CastExpr>(curExpr)) { 4410 if (auto *ice = dyn_cast<ImplicitCastExpr>(ce)) 4411 if (ice->getCastKind() == CK_ARCReclaimReturnedObject) { 4412 if (!prevExpr) 4413 return ice->getSubExpr(); 4414 if (auto *pe = dyn_cast<ParenExpr>(prevExpr)) 4415 pe->setSubExpr(ice->getSubExpr()); 4416 else 4417 cast<CastExpr>(prevExpr)->setSubExpr(ice->getSubExpr()); 4418 return e; 4419 } 4420 4421 prevExpr = curExpr; 4422 curExpr = ce->getSubExpr(); 4423 continue; 4424 } 4425 4426 // Break out of the loop if curExpr is neither a Paren nor a Cast. 4427 break; 4428 } 4429 4430 return e; 4431 } 4432 4433 ExprResult Sema::BuildObjCBridgedCast(SourceLocation LParenLoc, 4434 ObjCBridgeCastKind Kind, 4435 SourceLocation BridgeKeywordLoc, 4436 TypeSourceInfo *TSInfo, 4437 Expr *SubExpr) { 4438 ExprResult SubResult = UsualUnaryConversions(SubExpr); 4439 if (SubResult.isInvalid()) return ExprError(); 4440 SubExpr = SubResult.get(); 4441 4442 QualType T = TSInfo->getType(); 4443 QualType FromType = SubExpr->getType(); 4444 4445 CastKind CK; 4446 4447 bool MustConsume = false; 4448 if (T->isDependentType() || SubExpr->isTypeDependent()) { 4449 // Okay: we'll build a dependent expression type. 4450 CK = CK_Dependent; 4451 } else if (T->isObjCARCBridgableType() && FromType->isCARCBridgableType()) { 4452 // Casting CF -> id 4453 CK = (T->isBlockPointerType() ? CK_AnyPointerToBlockPointerCast 4454 : CK_CPointerToObjCPointerCast); 4455 switch (Kind) { 4456 case OBC_Bridge: 4457 break; 4458 4459 case OBC_BridgeRetained: { 4460 bool br = isKnownName("CFBridgingRelease"); 4461 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind) 4462 << 2 4463 << FromType 4464 << (T->isBlockPointerType()? 1 : 0) 4465 << T 4466 << SubExpr->getSourceRange() 4467 << Kind; 4468 Diag(BridgeKeywordLoc, diag::note_arc_bridge) 4469 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge"); 4470 Diag(BridgeKeywordLoc, diag::note_arc_bridge_transfer) 4471 << FromType << br 4472 << FixItHint::CreateReplacement(BridgeKeywordLoc, 4473 br ? "CFBridgingRelease " 4474 : "__bridge_transfer "); 4475 4476 Kind = OBC_Bridge; 4477 break; 4478 } 4479 4480 case OBC_BridgeTransfer: 4481 // We must consume the Objective-C object produced by the cast. 4482 MustConsume = true; 4483 break; 4484 } 4485 } else if (T->isCARCBridgableType() && FromType->isObjCARCBridgableType()) { 4486 // Okay: id -> CF 4487 CK = CK_BitCast; 4488 switch (Kind) { 4489 case OBC_Bridge: 4490 // Reclaiming a value that's going to be __bridge-casted to CF 4491 // is very dangerous, so we don't do it. 4492 SubExpr = maybeUndoReclaimObject(SubExpr); 4493 break; 4494 4495 case OBC_BridgeRetained: 4496 // Produce the object before casting it. 4497 SubExpr = ImplicitCastExpr::Create(Context, FromType, 4498 CK_ARCProduceObject, 4499 SubExpr, nullptr, VK_RValue); 4500 break; 4501 4502 case OBC_BridgeTransfer: { 4503 bool br = isKnownName("CFBridgingRetain"); 4504 Diag(BridgeKeywordLoc, diag::err_arc_bridge_cast_wrong_kind) 4505 << (FromType->isBlockPointerType()? 1 : 0) 4506 << FromType 4507 << 2 4508 << T 4509 << SubExpr->getSourceRange() 4510 << Kind; 4511 4512 Diag(BridgeKeywordLoc, diag::note_arc_bridge) 4513 << FixItHint::CreateReplacement(BridgeKeywordLoc, "__bridge "); 4514 Diag(BridgeKeywordLoc, diag::note_arc_bridge_retained) 4515 << T << br 4516 << FixItHint::CreateReplacement(BridgeKeywordLoc, 4517 br ? "CFBridgingRetain " : "__bridge_retained"); 4518 4519 Kind = OBC_Bridge; 4520 break; 4521 } 4522 } 4523 } else { 4524 Diag(LParenLoc, diag::err_arc_bridge_cast_incompatible) 4525 << FromType << T << Kind 4526 << SubExpr->getSourceRange() 4527 << TSInfo->getTypeLoc().getSourceRange(); 4528 return ExprError(); 4529 } 4530 4531 Expr *Result = new (Context) ObjCBridgedCastExpr(LParenLoc, Kind, CK, 4532 BridgeKeywordLoc, 4533 TSInfo, SubExpr); 4534 4535 if (MustConsume) { 4536 Cleanup.setExprNeedsCleanups(true); 4537 Result = ImplicitCastExpr::Create(Context, T, CK_ARCConsumeObject, Result, 4538 nullptr, VK_RValue); 4539 } 4540 4541 return Result; 4542 } 4543 4544 ExprResult Sema::ActOnObjCBridgedCast(Scope *S, 4545 SourceLocation LParenLoc, 4546 ObjCBridgeCastKind Kind, 4547 SourceLocation BridgeKeywordLoc, 4548 ParsedType Type, 4549 SourceLocation RParenLoc, 4550 Expr *SubExpr) { 4551 TypeSourceInfo *TSInfo = nullptr; 4552 QualType T = GetTypeFromParser(Type, &TSInfo); 4553 if (Kind == OBC_Bridge) 4554 CheckTollFreeBridgeCast(T, SubExpr); 4555 if (!TSInfo) 4556 TSInfo = Context.getTrivialTypeSourceInfo(T, LParenLoc); 4557 return BuildObjCBridgedCast(LParenLoc, Kind, BridgeKeywordLoc, TSInfo, 4558 SubExpr); 4559 } 4560