SemaExprObjC.cpp revision 1ce05a85971be4d02f9bb3f6ca8198364e32bfcb
1//===--- SemaExprObjC.cpp - Semantic Analysis for ObjC Expressions --------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for Objective-C expressions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/DeclObjC.h" 17#include "clang/AST/ExprObjC.h" 18#include "llvm/ADT/SmallString.h" 19#include "clang/Lex/Preprocessor.h" 20 21using namespace clang; 22 23Sema::ExprResult Sema::ParseObjCStringLiteral(SourceLocation *AtLocs, 24 ExprTy **strings, 25 unsigned NumStrings) { 26 StringLiteral **Strings = reinterpret_cast<StringLiteral**>(strings); 27 28 // Most ObjC strings are formed out of a single piece. However, we *can* 29 // have strings formed out of multiple @ strings with multiple pptokens in 30 // each one, e.g. @"foo" "bar" @"baz" "qux" which need to be turned into one 31 // StringLiteral for ObjCStringLiteral to hold onto. 32 StringLiteral *S = Strings[0]; 33 34 // If we have a multi-part string, merge it all together. 35 if (NumStrings != 1) { 36 // Concatenate objc strings. 37 llvm::SmallString<128> StrBuf; 38 llvm::SmallVector<SourceLocation, 8> StrLocs; 39 40 for (unsigned i = 0; i != NumStrings; ++i) { 41 S = Strings[i]; 42 43 // ObjC strings can't be wide. 44 if (S->isWide()) { 45 Diag(S->getLocStart(), diag::err_cfstring_literal_not_string_constant) 46 << S->getSourceRange(); 47 return true; 48 } 49 50 // Get the string data. 51 StrBuf.append(S->getStrData(), S->getStrData()+S->getByteLength()); 52 53 // Get the locations of the string tokens. 54 StrLocs.append(S->tokloc_begin(), S->tokloc_end()); 55 56 // Free the temporary string. 57 S->Destroy(Context); 58 } 59 60 // Create the aggregate string with the appropriate content and location 61 // information. 62 S = StringLiteral::Create(Context, &StrBuf[0], StrBuf.size(), false, 63 Context.getPointerType(Context.CharTy), 64 &StrLocs[0], StrLocs.size()); 65 } 66 67 // Verify that this composite string is acceptable for ObjC strings. 68 if (CheckObjCString(S)) 69 return true; 70 71 // Initialize the constant string interface lazily. This assumes 72 // the NSString interface is seen in this translation unit. Note: We 73 // don't use NSConstantString, since the runtime team considers this 74 // interface private (even though it appears in the header files). 75 QualType Ty = Context.getObjCConstantStringInterface(); 76 if (!Ty.isNull()) { 77 Ty = Context.getObjCObjectPointerType(Ty); 78 } else { 79 IdentifierInfo *NSIdent = &Context.Idents.get("NSString"); 80 NamedDecl *IF = LookupSingleName(TUScope, NSIdent, LookupOrdinaryName); 81 if (ObjCInterfaceDecl *StrIF = dyn_cast_or_null<ObjCInterfaceDecl>(IF)) { 82 Context.setObjCConstantStringInterface(StrIF); 83 Ty = Context.getObjCConstantStringInterface(); 84 Ty = Context.getObjCObjectPointerType(Ty); 85 } else { 86 // If there is no NSString interface defined then treat constant 87 // strings as untyped objects and let the runtime figure it out later. 88 Ty = Context.getObjCIdType(); 89 } 90 } 91 92 return new (Context) ObjCStringLiteral(S, Ty, AtLocs[0]); 93} 94 95Expr *Sema::BuildObjCEncodeExpression(SourceLocation AtLoc, 96 QualType EncodedType, 97 SourceLocation RParenLoc) { 98 QualType StrTy; 99 if (EncodedType->isDependentType()) 100 StrTy = Context.DependentTy; 101 else { 102 std::string Str; 103 Context.getObjCEncodingForType(EncodedType, Str); 104 105 // The type of @encode is the same as the type of the corresponding string, 106 // which is an array type. 107 StrTy = Context.CharTy; 108 // A C++ string literal has a const-qualified element type (C++ 2.13.4p1). 109 if (getLangOptions().CPlusPlus) 110 StrTy.addConst(); 111 StrTy = Context.getConstantArrayType(StrTy, llvm::APInt(32, Str.size()+1), 112 ArrayType::Normal, 0); 113 } 114 115 return new (Context) ObjCEncodeExpr(StrTy, EncodedType, AtLoc, RParenLoc); 116} 117 118Sema::ExprResult Sema::ParseObjCEncodeExpression(SourceLocation AtLoc, 119 SourceLocation EncodeLoc, 120 SourceLocation LParenLoc, 121 TypeTy *ty, 122 SourceLocation RParenLoc) { 123 // FIXME: Preserve type source info ? 124 QualType EncodedType = GetTypeFromParser(ty); 125 126 return BuildObjCEncodeExpression(AtLoc, EncodedType, RParenLoc); 127} 128 129Sema::ExprResult Sema::ParseObjCSelectorExpression(Selector Sel, 130 SourceLocation AtLoc, 131 SourceLocation SelLoc, 132 SourceLocation LParenLoc, 133 SourceLocation RParenLoc) { 134 ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool(Sel, 135 SourceRange(LParenLoc, RParenLoc), false); 136 if (!Method) 137 Method = LookupFactoryMethodInGlobalPool(Sel, 138 SourceRange(LParenLoc, RParenLoc)); 139 if (!Method) 140 Diag(SelLoc, diag::warn_undeclared_selector) << Sel; 141 142 QualType Ty = Context.getObjCSelType(); 143 return new (Context) ObjCSelectorExpr(Ty, Sel, AtLoc, RParenLoc); 144} 145 146Sema::ExprResult Sema::ParseObjCProtocolExpression(IdentifierInfo *ProtocolId, 147 SourceLocation AtLoc, 148 SourceLocation ProtoLoc, 149 SourceLocation LParenLoc, 150 SourceLocation RParenLoc) { 151 ObjCProtocolDecl* PDecl = LookupProtocol(ProtocolId); 152 if (!PDecl) { 153 Diag(ProtoLoc, diag::err_undeclared_protocol) << ProtocolId; 154 return true; 155 } 156 157 QualType Ty = Context.getObjCProtoType(); 158 if (Ty.isNull()) 159 return true; 160 Ty = Context.getObjCObjectPointerType(Ty); 161 return new (Context) ObjCProtocolExpr(Ty, PDecl, AtLoc, RParenLoc); 162} 163 164bool Sema::CheckMessageArgumentTypes(Expr **Args, unsigned NumArgs, 165 Selector Sel, ObjCMethodDecl *Method, 166 bool isClassMessage, 167 SourceLocation lbrac, SourceLocation rbrac, 168 QualType &ReturnType) { 169 if (!Method) { 170 // Apply default argument promotion as for (C99 6.5.2.2p6). 171 for (unsigned i = 0; i != NumArgs; i++) 172 DefaultArgumentPromotion(Args[i]); 173 174 unsigned DiagID = isClassMessage ? diag::warn_class_method_not_found : 175 diag::warn_inst_method_not_found; 176 Diag(lbrac, DiagID) 177 << Sel << isClassMessage << SourceRange(lbrac, rbrac); 178 ReturnType = Context.getObjCIdType(); 179 return false; 180 } 181 182 ReturnType = Method->getResultType(); 183 184 unsigned NumNamedArgs = Sel.getNumArgs(); 185 assert(NumArgs >= NumNamedArgs && "Too few arguments for selector!"); 186 187 bool IsError = false; 188 for (unsigned i = 0; i < NumNamedArgs; i++) { 189 Expr *argExpr = Args[i]; 190 assert(argExpr && "CheckMessageArgumentTypes(): missing expression"); 191 192 QualType lhsType = Method->param_begin()[i]->getType(); 193 QualType rhsType = argExpr->getType(); 194 195 // If necessary, apply function/array conversion. C99 6.7.5.3p[7,8]. 196 if (lhsType->isArrayType()) 197 lhsType = Context.getArrayDecayedType(lhsType); 198 else if (lhsType->isFunctionType()) 199 lhsType = Context.getPointerType(lhsType); 200 201 AssignConvertType Result = 202 CheckSingleAssignmentConstraints(lhsType, argExpr); 203 if (Args[i] != argExpr) // The expression was converted. 204 Args[i] = argExpr; // Make sure we store the converted expression. 205 206 IsError |= 207 DiagnoseAssignmentResult(Result, argExpr->getLocStart(), lhsType, rhsType, 208 argExpr, AA_Sending); 209 } 210 211 // Promote additional arguments to variadic methods. 212 if (Method->isVariadic()) { 213 for (unsigned i = NumNamedArgs; i < NumArgs; ++i) 214 IsError |= DefaultVariadicArgumentPromotion(Args[i], VariadicMethod); 215 } else { 216 // Check for extra arguments to non-variadic methods. 217 if (NumArgs != NumNamedArgs) { 218 Diag(Args[NumNamedArgs]->getLocStart(), 219 diag::err_typecheck_call_too_many_args) 220 << 2 /*method*/ << Method->getSourceRange() 221 << SourceRange(Args[NumNamedArgs]->getLocStart(), 222 Args[NumArgs-1]->getLocEnd()); 223 } 224 } 225 226 return IsError; 227} 228 229bool Sema::isSelfExpr(Expr *RExpr) { 230 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(RExpr)) 231 if (DRE->getDecl()->getIdentifier() == &Context.Idents.get("self")) 232 return true; 233 return false; 234} 235 236// Helper method for ActOnClassMethod/ActOnInstanceMethod. 237// Will search "local" class/category implementations for a method decl. 238// If failed, then we search in class's root for an instance method. 239// Returns 0 if no method is found. 240ObjCMethodDecl *Sema::LookupPrivateClassMethod(Selector Sel, 241 ObjCInterfaceDecl *ClassDecl) { 242 ObjCMethodDecl *Method = 0; 243 // lookup in class and all superclasses 244 while (ClassDecl && !Method) { 245 if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation()) 246 Method = ImpDecl->getClassMethod(Sel); 247 248 // Look through local category implementations associated with the class. 249 if (!Method) 250 Method = ClassDecl->getCategoryClassMethod(Sel); 251 252 // Before we give up, check if the selector is an instance method. 253 // But only in the root. This matches gcc's behaviour and what the 254 // runtime expects. 255 if (!Method && !ClassDecl->getSuperClass()) { 256 Method = ClassDecl->lookupInstanceMethod(Sel); 257 // Look through local category implementations associated 258 // with the root class. 259 if (!Method) 260 Method = LookupPrivateInstanceMethod(Sel, ClassDecl); 261 } 262 263 ClassDecl = ClassDecl->getSuperClass(); 264 } 265 return Method; 266} 267 268ObjCMethodDecl *Sema::LookupPrivateInstanceMethod(Selector Sel, 269 ObjCInterfaceDecl *ClassDecl) { 270 ObjCMethodDecl *Method = 0; 271 while (ClassDecl && !Method) { 272 // If we have implementations in scope, check "private" methods. 273 if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation()) 274 Method = ImpDecl->getInstanceMethod(Sel); 275 276 // Look through local category implementations associated with the class. 277 if (!Method) 278 Method = ClassDecl->getCategoryInstanceMethod(Sel); 279 ClassDecl = ClassDecl->getSuperClass(); 280 } 281 return Method; 282} 283 284Action::OwningExprResult Sema::ActOnClassPropertyRefExpr( 285 IdentifierInfo &receiverName, 286 IdentifierInfo &propertyName, 287 SourceLocation &receiverNameLoc, 288 SourceLocation &propertyNameLoc) { 289 290 IdentifierInfo *receiverNamePtr = &receiverName; 291 ObjCInterfaceDecl *IFace = getObjCInterfaceDecl(receiverNamePtr); 292 293 // Search for a declared property first. 294 295 Selector Sel = PP.getSelectorTable().getNullarySelector(&propertyName); 296 ObjCMethodDecl *Getter = IFace->lookupClassMethod(Sel); 297 298 // If this reference is in an @implementation, check for 'private' methods. 299 if (!Getter) 300 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 301 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 302 if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation()) 303 Getter = ImpDecl->getClassMethod(Sel); 304 305 if (Getter) { 306 // FIXME: refactor/share with ActOnMemberReference(). 307 // Check if we can reference this property. 308 if (DiagnoseUseOfDecl(Getter, propertyNameLoc)) 309 return ExprError(); 310 } 311 312 // Look for the matching setter, in case it is needed. 313 Selector SetterSel = 314 SelectorTable::constructSetterName(PP.getIdentifierTable(), 315 PP.getSelectorTable(), &propertyName); 316 317 ObjCMethodDecl *Setter = IFace->lookupClassMethod(SetterSel); 318 if (!Setter) { 319 // If this reference is in an @implementation, also check for 'private' 320 // methods. 321 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) 322 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 323 if (ObjCImplementationDecl *ImpDecl = ClassDecl->getImplementation()) 324 Setter = ImpDecl->getClassMethod(SetterSel); 325 } 326 // Look through local category implementations associated with the class. 327 if (!Setter) 328 Setter = IFace->getCategoryClassMethod(SetterSel); 329 330 if (Setter && DiagnoseUseOfDecl(Setter, propertyNameLoc)) 331 return ExprError(); 332 333 if (Getter || Setter) { 334 QualType PType; 335 336 if (Getter) 337 PType = Getter->getResultType(); 338 else { 339 for (ObjCMethodDecl::param_iterator PI = Setter->param_begin(), 340 E = Setter->param_end(); PI != E; ++PI) 341 PType = (*PI)->getType(); 342 } 343 return Owned(new (Context) ObjCImplicitSetterGetterRefExpr( 344 Getter, PType, Setter, 345 propertyNameLoc, IFace, receiverNameLoc)); 346 } 347 return ExprError(Diag(propertyNameLoc, diag::err_property_not_found) 348 << &propertyName << Context.getObjCInterfaceType(IFace)); 349} 350 351 352// ActOnClassMessage - used for both unary and keyword messages. 353// ArgExprs is optional - if it is present, the number of expressions 354// is obtained from Sel.getNumArgs(). 355Sema::ExprResult Sema::ActOnClassMessage( 356 Scope *S, 357 IdentifierInfo *receiverName, Selector Sel, 358 SourceLocation lbrac, SourceLocation receiverLoc, 359 SourceLocation selectorLoc, SourceLocation rbrac, 360 ExprTy **Args, unsigned NumArgs) { 361 assert(receiverName && "missing receiver class name"); 362 363 Expr **ArgExprs = reinterpret_cast<Expr **>(Args); 364 ObjCInterfaceDecl* ClassDecl = 0; 365 bool isSuper = false; 366 367 if (receiverName->isStr("super")) { 368 if (getCurMethodDecl()) { 369 isSuper = true; 370 ObjCInterfaceDecl *OID = getCurMethodDecl()->getClassInterface(); 371 if (!OID) 372 return Diag(lbrac, diag::error_no_super_class_message) 373 << getCurMethodDecl()->getDeclName(); 374 ClassDecl = OID->getSuperClass(); 375 if (!ClassDecl) 376 return Diag(lbrac, diag::error_no_super_class) << OID->getDeclName(); 377 if (getCurMethodDecl()->isInstanceMethod()) { 378 QualType superTy = Context.getObjCInterfaceType(ClassDecl); 379 superTy = Context.getObjCObjectPointerType(superTy); 380 ExprResult ReceiverExpr = new (Context) ObjCSuperExpr(SourceLocation(), 381 superTy); 382 // We are really in an instance method, redirect. 383 return ActOnInstanceMessage(ReceiverExpr.get(), Sel, lbrac, 384 selectorLoc, rbrac, Args, NumArgs); 385 } 386 // We are sending a message to 'super' within a class method. Do nothing, 387 // the receiver will pass through as 'super' (how convenient:-). 388 } else { 389 // 'super' has been used outside a method context. If a variable named 390 // 'super' has been declared, redirect. If not, produce a diagnostic. 391 NamedDecl *SuperDecl 392 = LookupSingleName(S, receiverName, LookupOrdinaryName); 393 ValueDecl *VD = dyn_cast_or_null<ValueDecl>(SuperDecl); 394 if (VD) { 395 ExprResult ReceiverExpr = new (Context) DeclRefExpr(VD, VD->getType(), 396 receiverLoc); 397 // We are really in an instance method, redirect. 398 return ActOnInstanceMessage(ReceiverExpr.get(), Sel, lbrac, 399 selectorLoc, rbrac, Args, NumArgs); 400 } 401 return Diag(receiverLoc, diag::err_undeclared_var_use) << receiverName; 402 } 403 } else 404 ClassDecl = getObjCInterfaceDecl(receiverName, receiverLoc); 405 406 // The following code allows for the following GCC-ism: 407 // 408 // typedef XCElementDisplayRect XCElementGraphicsRect; 409 // 410 // @implementation XCRASlice 411 // - whatever { // Note that XCElementGraphicsRect is a typedef name. 412 // _sGraphicsDelegate =[[XCElementGraphicsRect alloc] init]; 413 // } 414 // 415 // If necessary, the following lookup could move to getObjCInterfaceDecl(). 416 if (!ClassDecl) { 417 NamedDecl *IDecl 418 = LookupSingleName(TUScope, receiverName, LookupOrdinaryName); 419 if (TypedefDecl *OCTD = dyn_cast_or_null<TypedefDecl>(IDecl)) { 420 const ObjCInterfaceType *OCIT; 421 OCIT = OCTD->getUnderlyingType()->getAs<ObjCInterfaceType>(); 422 if (!OCIT) { 423 Diag(receiverLoc, diag::err_invalid_receiver_to_message); 424 return true; 425 } 426 ClassDecl = OCIT->getDecl(); 427 } 428 } 429 assert(ClassDecl && "missing interface declaration"); 430 ObjCMethodDecl *Method = 0; 431 QualType returnType; 432 if (ClassDecl->isForwardDecl()) { 433 // A forward class used in messaging is tread as a 'Class' 434 Diag(lbrac, diag::warn_receiver_forward_class) << ClassDecl->getDeclName(); 435 Method = LookupFactoryMethodInGlobalPool(Sel, SourceRange(lbrac,rbrac)); 436 if (Method) 437 Diag(Method->getLocation(), diag::note_method_sent_forward_class) 438 << Method->getDeclName(); 439 } 440 if (!Method) 441 Method = ClassDecl->lookupClassMethod(Sel); 442 443 // If we have an implementation in scope, check "private" methods. 444 if (!Method) 445 Method = LookupPrivateClassMethod(Sel, ClassDecl); 446 447 if (Method && DiagnoseUseOfDecl(Method, receiverLoc)) 448 return true; 449 450 if (CheckMessageArgumentTypes(ArgExprs, NumArgs, Sel, Method, true, 451 lbrac, rbrac, returnType)) 452 return true; 453 454 returnType = returnType.getNonReferenceType(); 455 456 // If we have the ObjCInterfaceDecl* for the class that is receiving the 457 // message, use that to construct the ObjCMessageExpr. Otherwise pass on the 458 // IdentifierInfo* for the class. 459 // FIXME: need to do a better job handling 'super' usage within a class. For 460 // now, we simply pass the "super" identifier through (which isn't consistent 461 // with instance methods. 462 if (isSuper) 463 return new (Context) ObjCMessageExpr(receiverName, Sel, returnType, Method, 464 lbrac, rbrac, ArgExprs, NumArgs); 465 else 466 return new (Context) ObjCMessageExpr(ClassDecl, Sel, returnType, Method, 467 lbrac, rbrac, ArgExprs, NumArgs); 468} 469 470// ActOnInstanceMessage - used for both unary and keyword messages. 471// ArgExprs is optional - if it is present, the number of expressions 472// is obtained from Sel.getNumArgs(). 473Sema::ExprResult Sema::ActOnInstanceMessage(ExprTy *receiver, Selector Sel, 474 SourceLocation lbrac, 475 SourceLocation receiverLoc, 476 SourceLocation rbrac, 477 ExprTy **Args, unsigned NumArgs) { 478 assert(receiver && "missing receiver expression"); 479 480 Expr **ArgExprs = reinterpret_cast<Expr **>(Args); 481 Expr *RExpr = static_cast<Expr *>(receiver); 482 483 // If necessary, apply function/array conversion to the receiver. 484 // C99 6.7.5.3p[7,8]. 485 DefaultFunctionArrayConversion(RExpr); 486 487 QualType returnType; 488 QualType ReceiverCType = 489 Context.getCanonicalType(RExpr->getType()).getUnqualifiedType(); 490 491 // Handle messages to 'super'. 492 if (isa<ObjCSuperExpr>(RExpr)) { 493 ObjCMethodDecl *Method = 0; 494 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) { 495 // If we have an interface in scope, check 'super' methods. 496 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) 497 if (ObjCInterfaceDecl *SuperDecl = ClassDecl->getSuperClass()) { 498 Method = SuperDecl->lookupInstanceMethod(Sel); 499 500 if (!Method) 501 // If we have implementations in scope, check "private" methods. 502 Method = LookupPrivateInstanceMethod(Sel, SuperDecl); 503 } 504 } 505 506 if (Method && DiagnoseUseOfDecl(Method, receiverLoc)) 507 return true; 508 509 if (CheckMessageArgumentTypes(ArgExprs, NumArgs, Sel, Method, false, 510 lbrac, rbrac, returnType)) 511 return true; 512 513 returnType = returnType.getNonReferenceType(); 514 return new (Context) ObjCMessageExpr(RExpr, Sel, returnType, Method, lbrac, 515 rbrac, ArgExprs, NumArgs); 516 } 517 518 // Handle messages to id. 519 if (ReceiverCType->isObjCIdType() || ReceiverCType->isBlockPointerType() || 520 Context.isObjCNSObjectType(RExpr->getType())) { 521 ObjCMethodDecl *Method = LookupInstanceMethodInGlobalPool( 522 Sel, SourceRange(lbrac,rbrac)); 523 if (!Method) 524 Method = LookupFactoryMethodInGlobalPool(Sel, SourceRange(lbrac, rbrac)); 525 if (CheckMessageArgumentTypes(ArgExprs, NumArgs, Sel, Method, false, 526 lbrac, rbrac, returnType)) 527 return true; 528 returnType = returnType.getNonReferenceType(); 529 return new (Context) ObjCMessageExpr(RExpr, Sel, returnType, Method, lbrac, 530 rbrac, ArgExprs, NumArgs); 531 } 532 533 // Handle messages to Class. 534 if (ReceiverCType->isObjCClassType() || 535 ReceiverCType->isObjCQualifiedClassType()) { 536 ObjCMethodDecl *Method = 0; 537 538 if (ObjCMethodDecl *CurMeth = getCurMethodDecl()) { 539 if (ObjCInterfaceDecl *ClassDecl = CurMeth->getClassInterface()) { 540 // First check the public methods in the class interface. 541 Method = ClassDecl->lookupClassMethod(Sel); 542 543 if (!Method) 544 Method = LookupPrivateClassMethod(Sel, ClassDecl); 545 546 // FIXME: if we still haven't found a method, we need to look in 547 // protocols (if we have qualifiers). 548 } 549 if (Method && DiagnoseUseOfDecl(Method, receiverLoc)) 550 return true; 551 } 552 if (!Method) { 553 // If not messaging 'self', look for any factory method named 'Sel'. 554 if (!isSelfExpr(RExpr)) { 555 Method = LookupFactoryMethodInGlobalPool(Sel, SourceRange(lbrac,rbrac)); 556 if (!Method) { 557 // If no class (factory) method was found, check if an _instance_ 558 // method of the same name exists in the root class only. 559 Method = LookupInstanceMethodInGlobalPool( 560 Sel, SourceRange(lbrac,rbrac)); 561 if (Method) 562 if (const ObjCInterfaceDecl *ID = 563 dyn_cast<ObjCInterfaceDecl>(Method->getDeclContext())) { 564 if (ID->getSuperClass()) 565 Diag(lbrac, diag::warn_root_inst_method_not_found) 566 << Sel << SourceRange(lbrac, rbrac); 567 } 568 } 569 } 570 } 571 if (CheckMessageArgumentTypes(ArgExprs, NumArgs, Sel, Method, false, 572 lbrac, rbrac, returnType)) 573 return true; 574 returnType = returnType.getNonReferenceType(); 575 return new (Context) ObjCMessageExpr(RExpr, Sel, returnType, Method, lbrac, 576 rbrac, ArgExprs, NumArgs); 577 } 578 579 ObjCMethodDecl *Method = 0; 580 ObjCInterfaceDecl* ClassDecl = 0; 581 582 // We allow sending a message to a qualified ID ("id<foo>"), which is ok as 583 // long as one of the protocols implements the selector (if not, warn). 584 if (const ObjCObjectPointerType *QIdTy = 585 ReceiverCType->getAsObjCQualifiedIdType()) { 586 // Search protocols for instance methods. 587 for (ObjCObjectPointerType::qual_iterator I = QIdTy->qual_begin(), 588 E = QIdTy->qual_end(); I != E; ++I) { 589 ObjCProtocolDecl *PDecl = *I; 590 if (PDecl && (Method = PDecl->lookupInstanceMethod(Sel))) 591 break; 592 // Since we aren't supporting "Class<foo>", look for a class method. 593 if (PDecl && (Method = PDecl->lookupClassMethod(Sel))) 594 break; 595 } 596 } else if (const ObjCObjectPointerType *OCIType = 597 ReceiverCType->getAsObjCInterfacePointerType()) { 598 // We allow sending a message to a pointer to an interface (an object). 599 600 ClassDecl = OCIType->getInterfaceDecl(); 601 // FIXME: consider using LookupInstanceMethodInGlobalPool, since it will be 602 // faster than the following method (which can do *many* linear searches). 603 // The idea is to add class info to InstanceMethodPool. 604 Method = ClassDecl->lookupInstanceMethod(Sel); 605 606 if (!Method) { 607 // Search protocol qualifiers. 608 for (ObjCObjectPointerType::qual_iterator QI = OCIType->qual_begin(), 609 E = OCIType->qual_end(); QI != E; ++QI) { 610 if ((Method = (*QI)->lookupInstanceMethod(Sel))) 611 break; 612 } 613 } 614 if (!Method) { 615 // If we have implementations in scope, check "private" methods. 616 Method = LookupPrivateInstanceMethod(Sel, ClassDecl); 617 618 if (!Method && !isSelfExpr(RExpr)) { 619 // If we still haven't found a method, look in the global pool. This 620 // behavior isn't very desirable, however we need it for GCC 621 // compatibility. FIXME: should we deviate?? 622 if (OCIType->qual_empty()) { 623 Method = LookupInstanceMethodInGlobalPool( 624 Sel, SourceRange(lbrac,rbrac)); 625 if (Method && !OCIType->getInterfaceDecl()->isForwardDecl()) 626 Diag(lbrac, diag::warn_maynot_respond) 627 << OCIType->getInterfaceDecl()->getIdentifier()->getName() << Sel; 628 } 629 } 630 } 631 if (Method && DiagnoseUseOfDecl(Method, receiverLoc)) 632 return true; 633 } else if (!Context.getObjCIdType().isNull() && 634 (ReceiverCType->isPointerType() || 635 (ReceiverCType->isIntegerType() && 636 ReceiverCType->isScalarType()))) { 637 // Implicitly convert integers and pointers to 'id' but emit a warning. 638 Diag(lbrac, diag::warn_bad_receiver_type) 639 << RExpr->getType() << RExpr->getSourceRange(); 640 if (ReceiverCType->isPointerType()) 641 ImpCastExprToType(RExpr, Context.getObjCIdType(), CastExpr::CK_BitCast); 642 else 643 ImpCastExprToType(RExpr, Context.getObjCIdType(), 644 CastExpr::CK_IntegralToPointer); 645 } else { 646 // Reject other random receiver types (e.g. structs). 647 Diag(lbrac, diag::err_bad_receiver_type) 648 << RExpr->getType() << RExpr->getSourceRange(); 649 return true; 650 } 651 652 if (Method) 653 DiagnoseSentinelCalls(Method, receiverLoc, ArgExprs, NumArgs); 654 if (CheckMessageArgumentTypes(ArgExprs, NumArgs, Sel, Method, false, 655 lbrac, rbrac, returnType)) 656 return true; 657 returnType = returnType.getNonReferenceType(); 658 return new (Context) ObjCMessageExpr(RExpr, Sel, returnType, Method, lbrac, 659 rbrac, ArgExprs, NumArgs); 660} 661 662