SemaDeclObjC.cpp revision 8f457004a1fdfc9c70fb52c5bc2e9d4ea6780d8d
1//===--- SemaDeclObjC.cpp - Semantic Analysis for ObjC Declarations -------===// 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 declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Lookup.h" 16#include "clang/Sema/ExternalSemaSource.h" 17#include "clang/Sema/Scope.h" 18#include "clang/Sema/ScopeInfo.h" 19#include "clang/AST/Expr.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/DeclObjC.h" 22#include "clang/Sema/DeclSpec.h" 23#include "llvm/ADT/DenseSet.h" 24 25using namespace clang; 26 27static void DiagnoseObjCImplementedDeprecations(Sema &S, 28 NamedDecl *ND, 29 SourceLocation ImplLoc, 30 int select) { 31 32 unsigned DIAG = diag::warn_deprecated_def; 33 if (S.Diags.getDiagnosticLevel(DIAG, ImplLoc)== Diagnostic::Ignored) 34 return; 35 if (ND && ND->getAttr<DeprecatedAttr>()) { 36 S.Diag(ImplLoc, DIAG) << select; 37 if (select == 0) 38 S.Diag(ND->getLocation(), diag::note_method_declared_at); 39 else 40 S.Diag(ND->getLocation(), diag::note_previous_decl) << "class"; 41 } 42} 43 44/// ActOnStartOfObjCMethodDef - This routine sets up parameters; invisible 45/// and user declared, in the method definition's AST. 46void Sema::ActOnStartOfObjCMethodDef(Scope *FnBodyScope, Decl *D) { 47 assert(getCurMethodDecl() == 0 && "Method parsing confused"); 48 ObjCMethodDecl *MDecl = dyn_cast_or_null<ObjCMethodDecl>(D); 49 50 // If we don't have a valid method decl, simply return. 51 if (!MDecl) 52 return; 53 54 // Allow the rest of sema to find private method decl implementations. 55 if (MDecl->isInstanceMethod()) 56 AddInstanceMethodToGlobalPool(MDecl, true); 57 else 58 AddFactoryMethodToGlobalPool(MDecl, true); 59 60 // Allow all of Sema to see that we are entering a method definition. 61 PushDeclContext(FnBodyScope, MDecl); 62 PushFunctionScope(); 63 64 // Create Decl objects for each parameter, entrring them in the scope for 65 // binding to their use. 66 67 // Insert the invisible arguments, self and _cmd! 68 MDecl->createImplicitParams(Context, MDecl->getClassInterface()); 69 70 PushOnScopeChains(MDecl->getSelfDecl(), FnBodyScope); 71 PushOnScopeChains(MDecl->getCmdDecl(), FnBodyScope); 72 73 // Introduce all of the other parameters into this scope. 74 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(), 75 E = MDecl->param_end(); PI != E; ++PI) { 76 ParmVarDecl *Param = (*PI); 77 if (!Param->isInvalidDecl() && 78 RequireCompleteType(Param->getLocation(), Param->getType(), 79 diag::err_typecheck_decl_incomplete_type)) 80 Param->setInvalidDecl(); 81 if ((*PI)->getIdentifier()) 82 PushOnScopeChains(*PI, FnBodyScope); 83 } 84 // Warn on implementating deprecated methods under 85 // -Wdeprecated-implementations flag. 86 if (ObjCInterfaceDecl *IC = MDecl->getClassInterface()) 87 if (ObjCMethodDecl *IMD = 88 IC->lookupMethod(MDecl->getSelector(), MDecl->isInstanceMethod())) 89 DiagnoseObjCImplementedDeprecations(*this, 90 dyn_cast<NamedDecl>(IMD), 91 MDecl->getLocation(), 0); 92} 93 94Decl *Sema:: 95ActOnStartClassInterface(SourceLocation AtInterfaceLoc, 96 IdentifierInfo *ClassName, SourceLocation ClassLoc, 97 IdentifierInfo *SuperName, SourceLocation SuperLoc, 98 Decl * const *ProtoRefs, unsigned NumProtoRefs, 99 const SourceLocation *ProtoLocs, 100 SourceLocation EndProtoLoc, AttributeList *AttrList) { 101 assert(ClassName && "Missing class identifier"); 102 103 // Check for another declaration kind with the same name. 104 NamedDecl *PrevDecl = LookupSingleName(TUScope, ClassName, ClassLoc, 105 LookupOrdinaryName, ForRedeclaration); 106 107 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 108 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName; 109 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 110 } 111 112 ObjCInterfaceDecl* IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 113 if (IDecl) { 114 // Class already seen. Is it a forward declaration? 115 if (!IDecl->isForwardDecl()) { 116 IDecl->setInvalidDecl(); 117 Diag(AtInterfaceLoc, diag::err_duplicate_class_def)<<IDecl->getDeclName(); 118 Diag(IDecl->getLocation(), diag::note_previous_definition); 119 120 // Return the previous class interface. 121 // FIXME: don't leak the objects passed in! 122 return IDecl; 123 } else { 124 IDecl->setLocation(AtInterfaceLoc); 125 IDecl->setForwardDecl(false); 126 IDecl->setClassLoc(ClassLoc); 127 // If the forward decl was in a PCH, we need to write it again in a 128 // dependent AST file. 129 IDecl->setChangedSinceDeserialization(true); 130 131 // Since this ObjCInterfaceDecl was created by a forward declaration, 132 // we now add it to the DeclContext since it wasn't added before 133 // (see ActOnForwardClassDeclaration). 134 IDecl->setLexicalDeclContext(CurContext); 135 CurContext->addDecl(IDecl); 136 137 if (AttrList) 138 ProcessDeclAttributeList(TUScope, IDecl, AttrList); 139 } 140 } else { 141 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtInterfaceLoc, 142 ClassName, ClassLoc); 143 if (AttrList) 144 ProcessDeclAttributeList(TUScope, IDecl, AttrList); 145 146 PushOnScopeChains(IDecl, TUScope); 147 } 148 149 if (SuperName) { 150 // Check if a different kind of symbol declared in this scope. 151 PrevDecl = LookupSingleName(TUScope, SuperName, SuperLoc, 152 LookupOrdinaryName); 153 154 if (!PrevDecl) { 155 // Try to correct for a typo in the superclass name. 156 LookupResult R(*this, SuperName, SuperLoc, LookupOrdinaryName); 157 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 158 (PrevDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 159 Diag(SuperLoc, diag::err_undef_superclass_suggest) 160 << SuperName << ClassName << PrevDecl->getDeclName(); 161 Diag(PrevDecl->getLocation(), diag::note_previous_decl) 162 << PrevDecl->getDeclName(); 163 } 164 } 165 166 if (PrevDecl == IDecl) { 167 Diag(SuperLoc, diag::err_recursive_superclass) 168 << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc); 169 IDecl->setLocEnd(ClassLoc); 170 } else { 171 ObjCInterfaceDecl *SuperClassDecl = 172 dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 173 174 // Diagnose classes that inherit from deprecated classes. 175 if (SuperClassDecl) 176 (void)DiagnoseUseOfDecl(SuperClassDecl, SuperLoc); 177 178 if (PrevDecl && SuperClassDecl == 0) { 179 // The previous declaration was not a class decl. Check if we have a 180 // typedef. If we do, get the underlying class type. 181 if (const TypedefDecl *TDecl = dyn_cast_or_null<TypedefDecl>(PrevDecl)) { 182 QualType T = TDecl->getUnderlyingType(); 183 if (T->isObjCObjectType()) { 184 if (NamedDecl *IDecl = T->getAs<ObjCObjectType>()->getInterface()) 185 SuperClassDecl = dyn_cast<ObjCInterfaceDecl>(IDecl); 186 } 187 } 188 189 // This handles the following case: 190 // 191 // typedef int SuperClass; 192 // @interface MyClass : SuperClass {} @end 193 // 194 if (!SuperClassDecl) { 195 Diag(SuperLoc, diag::err_redefinition_different_kind) << SuperName; 196 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 197 } 198 } 199 200 if (!dyn_cast_or_null<TypedefDecl>(PrevDecl)) { 201 if (!SuperClassDecl) 202 Diag(SuperLoc, diag::err_undef_superclass) 203 << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc); 204 else if (SuperClassDecl->isForwardDecl()) 205 Diag(SuperLoc, diag::err_undef_superclass) 206 << SuperClassDecl->getDeclName() << ClassName 207 << SourceRange(AtInterfaceLoc, ClassLoc); 208 } 209 IDecl->setSuperClass(SuperClassDecl); 210 IDecl->setSuperClassLoc(SuperLoc); 211 IDecl->setLocEnd(SuperLoc); 212 } 213 } else { // we have a root class. 214 IDecl->setLocEnd(ClassLoc); 215 } 216 217 // Check then save referenced protocols. 218 if (NumProtoRefs) { 219 IDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs, 220 ProtoLocs, Context); 221 IDecl->setLocEnd(EndProtoLoc); 222 } 223 224 CheckObjCDeclScope(IDecl); 225 return IDecl; 226} 227 228/// ActOnCompatiblityAlias - this action is called after complete parsing of 229/// @compatibility_alias declaration. It sets up the alias relationships. 230Decl *Sema::ActOnCompatiblityAlias(SourceLocation AtLoc, 231 IdentifierInfo *AliasName, 232 SourceLocation AliasLocation, 233 IdentifierInfo *ClassName, 234 SourceLocation ClassLocation) { 235 // Look for previous declaration of alias name 236 NamedDecl *ADecl = LookupSingleName(TUScope, AliasName, AliasLocation, 237 LookupOrdinaryName, ForRedeclaration); 238 if (ADecl) { 239 if (isa<ObjCCompatibleAliasDecl>(ADecl)) 240 Diag(AliasLocation, diag::warn_previous_alias_decl); 241 else 242 Diag(AliasLocation, diag::err_conflicting_aliasing_type) << AliasName; 243 Diag(ADecl->getLocation(), diag::note_previous_declaration); 244 return 0; 245 } 246 // Check for class declaration 247 NamedDecl *CDeclU = LookupSingleName(TUScope, ClassName, ClassLocation, 248 LookupOrdinaryName, ForRedeclaration); 249 if (const TypedefDecl *TDecl = dyn_cast_or_null<TypedefDecl>(CDeclU)) { 250 QualType T = TDecl->getUnderlyingType(); 251 if (T->isObjCObjectType()) { 252 if (NamedDecl *IDecl = T->getAs<ObjCObjectType>()->getInterface()) { 253 ClassName = IDecl->getIdentifier(); 254 CDeclU = LookupSingleName(TUScope, ClassName, ClassLocation, 255 LookupOrdinaryName, ForRedeclaration); 256 } 257 } 258 } 259 ObjCInterfaceDecl *CDecl = dyn_cast_or_null<ObjCInterfaceDecl>(CDeclU); 260 if (CDecl == 0) { 261 Diag(ClassLocation, diag::warn_undef_interface) << ClassName; 262 if (CDeclU) 263 Diag(CDeclU->getLocation(), diag::note_previous_declaration); 264 return 0; 265 } 266 267 // Everything checked out, instantiate a new alias declaration AST. 268 ObjCCompatibleAliasDecl *AliasDecl = 269 ObjCCompatibleAliasDecl::Create(Context, CurContext, AtLoc, AliasName, CDecl); 270 271 if (!CheckObjCDeclScope(AliasDecl)) 272 PushOnScopeChains(AliasDecl, TUScope); 273 274 return AliasDecl; 275} 276 277void Sema::CheckForwardProtocolDeclarationForCircularDependency( 278 IdentifierInfo *PName, 279 SourceLocation &Ploc, SourceLocation PrevLoc, 280 const ObjCList<ObjCProtocolDecl> &PList) { 281 for (ObjCList<ObjCProtocolDecl>::iterator I = PList.begin(), 282 E = PList.end(); I != E; ++I) { 283 284 if (ObjCProtocolDecl *PDecl = LookupProtocol((*I)->getIdentifier(), 285 Ploc)) { 286 if (PDecl->getIdentifier() == PName) { 287 Diag(Ploc, diag::err_protocol_has_circular_dependency); 288 Diag(PrevLoc, diag::note_previous_definition); 289 } 290 CheckForwardProtocolDeclarationForCircularDependency(PName, Ploc, 291 PDecl->getLocation(), PDecl->getReferencedProtocols()); 292 } 293 } 294} 295 296Decl * 297Sema::ActOnStartProtocolInterface(SourceLocation AtProtoInterfaceLoc, 298 IdentifierInfo *ProtocolName, 299 SourceLocation ProtocolLoc, 300 Decl * const *ProtoRefs, 301 unsigned NumProtoRefs, 302 const SourceLocation *ProtoLocs, 303 SourceLocation EndProtoLoc, 304 AttributeList *AttrList) { 305 // FIXME: Deal with AttrList. 306 assert(ProtocolName && "Missing protocol identifier"); 307 ObjCProtocolDecl *PDecl = LookupProtocol(ProtocolName, ProtocolLoc); 308 if (PDecl) { 309 // Protocol already seen. Better be a forward protocol declaration 310 if (!PDecl->isForwardDecl()) { 311 Diag(ProtocolLoc, diag::warn_duplicate_protocol_def) << ProtocolName; 312 Diag(PDecl->getLocation(), diag::note_previous_definition); 313 // Just return the protocol we already had. 314 // FIXME: don't leak the objects passed in! 315 return PDecl; 316 } 317 ObjCList<ObjCProtocolDecl> PList; 318 PList.set((ObjCProtocolDecl *const*)ProtoRefs, NumProtoRefs, Context); 319 CheckForwardProtocolDeclarationForCircularDependency( 320 ProtocolName, ProtocolLoc, PDecl->getLocation(), PList); 321 322 // Make sure the cached decl gets a valid start location. 323 PDecl->setLocation(AtProtoInterfaceLoc); 324 PDecl->setForwardDecl(false); 325 CurContext->addDecl(PDecl); 326 // Repeat in dependent AST files. 327 PDecl->setChangedSinceDeserialization(true); 328 } else { 329 PDecl = ObjCProtocolDecl::Create(Context, CurContext, 330 AtProtoInterfaceLoc,ProtocolName); 331 PushOnScopeChains(PDecl, TUScope); 332 PDecl->setForwardDecl(false); 333 } 334 if (AttrList) 335 ProcessDeclAttributeList(TUScope, PDecl, AttrList); 336 if (NumProtoRefs) { 337 /// Check then save referenced protocols. 338 PDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs, 339 ProtoLocs, Context); 340 PDecl->setLocEnd(EndProtoLoc); 341 } 342 343 CheckObjCDeclScope(PDecl); 344 return PDecl; 345} 346 347/// FindProtocolDeclaration - This routine looks up protocols and 348/// issues an error if they are not declared. It returns list of 349/// protocol declarations in its 'Protocols' argument. 350void 351Sema::FindProtocolDeclaration(bool WarnOnDeclarations, 352 const IdentifierLocPair *ProtocolId, 353 unsigned NumProtocols, 354 llvm::SmallVectorImpl<Decl *> &Protocols) { 355 for (unsigned i = 0; i != NumProtocols; ++i) { 356 ObjCProtocolDecl *PDecl = LookupProtocol(ProtocolId[i].first, 357 ProtocolId[i].second); 358 if (!PDecl) { 359 LookupResult R(*this, ProtocolId[i].first, ProtocolId[i].second, 360 LookupObjCProtocolName); 361 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 362 (PDecl = R.getAsSingle<ObjCProtocolDecl>())) { 363 Diag(ProtocolId[i].second, diag::err_undeclared_protocol_suggest) 364 << ProtocolId[i].first << R.getLookupName(); 365 Diag(PDecl->getLocation(), diag::note_previous_decl) 366 << PDecl->getDeclName(); 367 } 368 } 369 370 if (!PDecl) { 371 Diag(ProtocolId[i].second, diag::err_undeclared_protocol) 372 << ProtocolId[i].first; 373 continue; 374 } 375 376 (void)DiagnoseUseOfDecl(PDecl, ProtocolId[i].second); 377 378 // If this is a forward declaration and we are supposed to warn in this 379 // case, do it. 380 if (WarnOnDeclarations && PDecl->isForwardDecl()) 381 Diag(ProtocolId[i].second, diag::warn_undef_protocolref) 382 << ProtocolId[i].first; 383 Protocols.push_back(PDecl); 384 } 385} 386 387/// DiagnoseClassExtensionDupMethods - Check for duplicate declaration of 388/// a class method in its extension. 389/// 390void Sema::DiagnoseClassExtensionDupMethods(ObjCCategoryDecl *CAT, 391 ObjCInterfaceDecl *ID) { 392 if (!ID) 393 return; // Possibly due to previous error 394 395 llvm::DenseMap<Selector, const ObjCMethodDecl*> MethodMap; 396 for (ObjCInterfaceDecl::method_iterator i = ID->meth_begin(), 397 e = ID->meth_end(); i != e; ++i) { 398 ObjCMethodDecl *MD = *i; 399 MethodMap[MD->getSelector()] = MD; 400 } 401 402 if (MethodMap.empty()) 403 return; 404 for (ObjCCategoryDecl::method_iterator i = CAT->meth_begin(), 405 e = CAT->meth_end(); i != e; ++i) { 406 ObjCMethodDecl *Method = *i; 407 const ObjCMethodDecl *&PrevMethod = MethodMap[Method->getSelector()]; 408 if (PrevMethod && !MatchTwoMethodDeclarations(Method, PrevMethod)) { 409 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 410 << Method->getDeclName(); 411 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 412 } 413 } 414} 415 416/// ActOnForwardProtocolDeclaration - Handle @protocol foo; 417Decl * 418Sema::ActOnForwardProtocolDeclaration(SourceLocation AtProtocolLoc, 419 const IdentifierLocPair *IdentList, 420 unsigned NumElts, 421 AttributeList *attrList) { 422 llvm::SmallVector<ObjCProtocolDecl*, 32> Protocols; 423 llvm::SmallVector<SourceLocation, 8> ProtoLocs; 424 425 for (unsigned i = 0; i != NumElts; ++i) { 426 IdentifierInfo *Ident = IdentList[i].first; 427 ObjCProtocolDecl *PDecl = LookupProtocol(Ident, IdentList[i].second); 428 bool isNew = false; 429 if (PDecl == 0) { // Not already seen? 430 PDecl = ObjCProtocolDecl::Create(Context, CurContext, 431 IdentList[i].second, Ident); 432 PushOnScopeChains(PDecl, TUScope, false); 433 isNew = true; 434 } 435 if (attrList) { 436 ProcessDeclAttributeList(TUScope, PDecl, attrList); 437 if (!isNew) 438 PDecl->setChangedSinceDeserialization(true); 439 } 440 Protocols.push_back(PDecl); 441 ProtoLocs.push_back(IdentList[i].second); 442 } 443 444 ObjCForwardProtocolDecl *PDecl = 445 ObjCForwardProtocolDecl::Create(Context, CurContext, AtProtocolLoc, 446 Protocols.data(), Protocols.size(), 447 ProtoLocs.data()); 448 CurContext->addDecl(PDecl); 449 CheckObjCDeclScope(PDecl); 450 return PDecl; 451} 452 453Decl *Sema:: 454ActOnStartCategoryInterface(SourceLocation AtInterfaceLoc, 455 IdentifierInfo *ClassName, SourceLocation ClassLoc, 456 IdentifierInfo *CategoryName, 457 SourceLocation CategoryLoc, 458 Decl * const *ProtoRefs, 459 unsigned NumProtoRefs, 460 const SourceLocation *ProtoLocs, 461 SourceLocation EndProtoLoc) { 462 ObjCCategoryDecl *CDecl; 463 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true); 464 465 /// Check that class of this category is already completely declared. 466 if (!IDecl || IDecl->isForwardDecl()) { 467 // Create an invalid ObjCCategoryDecl to serve as context for 468 // the enclosing method declarations. We mark the decl invalid 469 // to make it clear that this isn't a valid AST. 470 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc, 471 ClassLoc, CategoryLoc, CategoryName); 472 CDecl->setInvalidDecl(); 473 Diag(ClassLoc, diag::err_undef_interface) << ClassName; 474 return CDecl; 475 } 476 477 if (!CategoryName && IDecl->getImplementation()) { 478 Diag(ClassLoc, diag::err_class_extension_after_impl) << ClassName; 479 Diag(IDecl->getImplementation()->getLocation(), 480 diag::note_implementation_declared); 481 } 482 483 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc, 484 ClassLoc, CategoryLoc, CategoryName); 485 // FIXME: PushOnScopeChains? 486 CurContext->addDecl(CDecl); 487 488 CDecl->setClassInterface(IDecl); 489 // Insert class extension to the list of class's categories. 490 if (!CategoryName) 491 CDecl->insertNextClassCategory(); 492 493 // If the interface is deprecated, warn about it. 494 (void)DiagnoseUseOfDecl(IDecl, ClassLoc); 495 496 if (CategoryName) { 497 /// Check for duplicate interface declaration for this category 498 ObjCCategoryDecl *CDeclChain; 499 for (CDeclChain = IDecl->getCategoryList(); CDeclChain; 500 CDeclChain = CDeclChain->getNextClassCategory()) { 501 if (CDeclChain->getIdentifier() == CategoryName) { 502 // Class extensions can be declared multiple times. 503 Diag(CategoryLoc, diag::warn_dup_category_def) 504 << ClassName << CategoryName; 505 Diag(CDeclChain->getLocation(), diag::note_previous_definition); 506 break; 507 } 508 } 509 if (!CDeclChain) 510 CDecl->insertNextClassCategory(); 511 } 512 513 if (NumProtoRefs) { 514 CDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs, 515 ProtoLocs, Context); 516 // Protocols in the class extension belong to the class. 517 if (CDecl->IsClassExtension()) 518 IDecl->mergeClassExtensionProtocolList((ObjCProtocolDecl**)ProtoRefs, 519 NumProtoRefs, Context); 520 } 521 522 CheckObjCDeclScope(CDecl); 523 return CDecl; 524} 525 526/// ActOnStartCategoryImplementation - Perform semantic checks on the 527/// category implementation declaration and build an ObjCCategoryImplDecl 528/// object. 529Decl *Sema::ActOnStartCategoryImplementation( 530 SourceLocation AtCatImplLoc, 531 IdentifierInfo *ClassName, SourceLocation ClassLoc, 532 IdentifierInfo *CatName, SourceLocation CatLoc) { 533 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true); 534 ObjCCategoryDecl *CatIDecl = 0; 535 if (IDecl) { 536 CatIDecl = IDecl->FindCategoryDeclaration(CatName); 537 if (!CatIDecl) { 538 // Category @implementation with no corresponding @interface. 539 // Create and install one. 540 CatIDecl = ObjCCategoryDecl::Create(Context, CurContext, SourceLocation(), 541 SourceLocation(), SourceLocation(), 542 CatName); 543 CatIDecl->setClassInterface(IDecl); 544 CatIDecl->insertNextClassCategory(); 545 } 546 } 547 548 ObjCCategoryImplDecl *CDecl = 549 ObjCCategoryImplDecl::Create(Context, CurContext, AtCatImplLoc, CatName, 550 IDecl); 551 /// Check that class of this category is already completely declared. 552 if (!IDecl || IDecl->isForwardDecl()) 553 Diag(ClassLoc, diag::err_undef_interface) << ClassName; 554 555 // FIXME: PushOnScopeChains? 556 CurContext->addDecl(CDecl); 557 558 /// Check that CatName, category name, is not used in another implementation. 559 if (CatIDecl) { 560 if (CatIDecl->getImplementation()) { 561 Diag(ClassLoc, diag::err_dup_implementation_category) << ClassName 562 << CatName; 563 Diag(CatIDecl->getImplementation()->getLocation(), 564 diag::note_previous_definition); 565 } else { 566 CatIDecl->setImplementation(CDecl); 567 // Warn on implementating category of deprecated class under 568 // -Wdeprecated-implementations flag. 569 DiagnoseObjCImplementedDeprecations(*this, 570 dyn_cast<NamedDecl>(IDecl), 571 CDecl->getLocation(), 2); 572 } 573 } 574 575 CheckObjCDeclScope(CDecl); 576 return CDecl; 577} 578 579Decl *Sema::ActOnStartClassImplementation( 580 SourceLocation AtClassImplLoc, 581 IdentifierInfo *ClassName, SourceLocation ClassLoc, 582 IdentifierInfo *SuperClassname, 583 SourceLocation SuperClassLoc) { 584 ObjCInterfaceDecl* IDecl = 0; 585 // Check for another declaration kind with the same name. 586 NamedDecl *PrevDecl 587 = LookupSingleName(TUScope, ClassName, ClassLoc, LookupOrdinaryName, 588 ForRedeclaration); 589 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 590 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName; 591 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 592 } else if ((IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl))) { 593 // If this is a forward declaration of an interface, warn. 594 if (IDecl->isForwardDecl()) { 595 Diag(ClassLoc, diag::warn_undef_interface) << ClassName; 596 IDecl = 0; 597 } 598 } else { 599 // We did not find anything with the name ClassName; try to correct for 600 // typos in the class name. 601 LookupResult R(*this, ClassName, ClassLoc, LookupOrdinaryName); 602 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 603 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 604 // Suggest the (potentially) correct interface name. However, put the 605 // fix-it hint itself in a separate note, since changing the name in 606 // the warning would make the fix-it change semantics.However, don't 607 // provide a code-modification hint or use the typo name for recovery, 608 // because this is just a warning. The program may actually be correct. 609 Diag(ClassLoc, diag::warn_undef_interface_suggest) 610 << ClassName << R.getLookupName(); 611 Diag(IDecl->getLocation(), diag::note_previous_decl) 612 << R.getLookupName() 613 << FixItHint::CreateReplacement(ClassLoc, 614 R.getLookupName().getAsString()); 615 IDecl = 0; 616 } else { 617 Diag(ClassLoc, diag::warn_undef_interface) << ClassName; 618 } 619 } 620 621 // Check that super class name is valid class name 622 ObjCInterfaceDecl* SDecl = 0; 623 if (SuperClassname) { 624 // Check if a different kind of symbol declared in this scope. 625 PrevDecl = LookupSingleName(TUScope, SuperClassname, SuperClassLoc, 626 LookupOrdinaryName); 627 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 628 Diag(SuperClassLoc, diag::err_redefinition_different_kind) 629 << SuperClassname; 630 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 631 } else { 632 SDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 633 if (!SDecl) 634 Diag(SuperClassLoc, diag::err_undef_superclass) 635 << SuperClassname << ClassName; 636 else if (IDecl && IDecl->getSuperClass() != SDecl) { 637 // This implementation and its interface do not have the same 638 // super class. 639 Diag(SuperClassLoc, diag::err_conflicting_super_class) 640 << SDecl->getDeclName(); 641 Diag(SDecl->getLocation(), diag::note_previous_definition); 642 } 643 } 644 } 645 646 if (!IDecl) { 647 // Legacy case of @implementation with no corresponding @interface. 648 // Build, chain & install the interface decl into the identifier. 649 650 // FIXME: Do we support attributes on the @implementation? If so we should 651 // copy them over. 652 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtClassImplLoc, 653 ClassName, ClassLoc, false, true); 654 IDecl->setSuperClass(SDecl); 655 IDecl->setLocEnd(ClassLoc); 656 657 PushOnScopeChains(IDecl, TUScope); 658 } else { 659 // Mark the interface as being completed, even if it was just as 660 // @class ....; 661 // declaration; the user cannot reopen it. 662 IDecl->setForwardDecl(false); 663 } 664 665 ObjCImplementationDecl* IMPDecl = 666 ObjCImplementationDecl::Create(Context, CurContext, AtClassImplLoc, 667 IDecl, SDecl); 668 669 if (CheckObjCDeclScope(IMPDecl)) 670 return IMPDecl; 671 672 // Check that there is no duplicate implementation of this class. 673 if (IDecl->getImplementation()) { 674 // FIXME: Don't leak everything! 675 Diag(ClassLoc, diag::err_dup_implementation_class) << ClassName; 676 Diag(IDecl->getImplementation()->getLocation(), 677 diag::note_previous_definition); 678 } else { // add it to the list. 679 IDecl->setImplementation(IMPDecl); 680 PushOnScopeChains(IMPDecl, TUScope); 681 // Warn on implementating deprecated class under 682 // -Wdeprecated-implementations flag. 683 DiagnoseObjCImplementedDeprecations(*this, 684 dyn_cast<NamedDecl>(IDecl), 685 IMPDecl->getLocation(), 1); 686 } 687 return IMPDecl; 688} 689 690void Sema::CheckImplementationIvars(ObjCImplementationDecl *ImpDecl, 691 ObjCIvarDecl **ivars, unsigned numIvars, 692 SourceLocation RBrace) { 693 assert(ImpDecl && "missing implementation decl"); 694 ObjCInterfaceDecl* IDecl = ImpDecl->getClassInterface(); 695 if (!IDecl) 696 return; 697 /// Check case of non-existing @interface decl. 698 /// (legacy objective-c @implementation decl without an @interface decl). 699 /// Add implementations's ivar to the synthesize class's ivar list. 700 if (IDecl->isImplicitInterfaceDecl()) { 701 IDecl->setLocEnd(RBrace); 702 // Add ivar's to class's DeclContext. 703 for (unsigned i = 0, e = numIvars; i != e; ++i) { 704 ivars[i]->setLexicalDeclContext(ImpDecl); 705 IDecl->makeDeclVisibleInContext(ivars[i], false); 706 ImpDecl->addDecl(ivars[i]); 707 } 708 709 return; 710 } 711 // If implementation has empty ivar list, just return. 712 if (numIvars == 0) 713 return; 714 715 assert(ivars && "missing @implementation ivars"); 716 if (LangOpts.ObjCNonFragileABI2) { 717 if (ImpDecl->getSuperClass()) 718 Diag(ImpDecl->getLocation(), diag::warn_on_superclass_use); 719 for (unsigned i = 0; i < numIvars; i++) { 720 ObjCIvarDecl* ImplIvar = ivars[i]; 721 if (const ObjCIvarDecl *ClsIvar = 722 IDecl->getIvarDecl(ImplIvar->getIdentifier())) { 723 Diag(ImplIvar->getLocation(), diag::err_duplicate_ivar_declaration); 724 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 725 continue; 726 } 727 // Instance ivar to Implementation's DeclContext. 728 ImplIvar->setLexicalDeclContext(ImpDecl); 729 IDecl->makeDeclVisibleInContext(ImplIvar, false); 730 ImpDecl->addDecl(ImplIvar); 731 } 732 return; 733 } 734 // Check interface's Ivar list against those in the implementation. 735 // names and types must match. 736 // 737 unsigned j = 0; 738 ObjCInterfaceDecl::ivar_iterator 739 IVI = IDecl->ivar_begin(), IVE = IDecl->ivar_end(); 740 for (; numIvars > 0 && IVI != IVE; ++IVI) { 741 ObjCIvarDecl* ImplIvar = ivars[j++]; 742 ObjCIvarDecl* ClsIvar = *IVI; 743 assert (ImplIvar && "missing implementation ivar"); 744 assert (ClsIvar && "missing class ivar"); 745 746 // First, make sure the types match. 747 if (Context.getCanonicalType(ImplIvar->getType()) != 748 Context.getCanonicalType(ClsIvar->getType())) { 749 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_type) 750 << ImplIvar->getIdentifier() 751 << ImplIvar->getType() << ClsIvar->getType(); 752 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 753 } else if (ImplIvar->isBitField() && ClsIvar->isBitField()) { 754 Expr *ImplBitWidth = ImplIvar->getBitWidth(); 755 Expr *ClsBitWidth = ClsIvar->getBitWidth(); 756 if (ImplBitWidth->EvaluateAsInt(Context).getZExtValue() != 757 ClsBitWidth->EvaluateAsInt(Context).getZExtValue()) { 758 Diag(ImplBitWidth->getLocStart(), diag::err_conflicting_ivar_bitwidth) 759 << ImplIvar->getIdentifier(); 760 Diag(ClsBitWidth->getLocStart(), diag::note_previous_definition); 761 } 762 } 763 // Make sure the names are identical. 764 if (ImplIvar->getIdentifier() != ClsIvar->getIdentifier()) { 765 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_name) 766 << ImplIvar->getIdentifier() << ClsIvar->getIdentifier(); 767 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 768 } 769 --numIvars; 770 } 771 772 if (numIvars > 0) 773 Diag(ivars[j]->getLocation(), diag::err_inconsistant_ivar_count); 774 else if (IVI != IVE) 775 Diag((*IVI)->getLocation(), diag::err_inconsistant_ivar_count); 776} 777 778void Sema::WarnUndefinedMethod(SourceLocation ImpLoc, ObjCMethodDecl *method, 779 bool &IncompleteImpl, unsigned DiagID) { 780 if (!IncompleteImpl) { 781 Diag(ImpLoc, diag::warn_incomplete_impl); 782 IncompleteImpl = true; 783 } 784 if (DiagID == diag::warn_unimplemented_protocol_method) 785 Diag(ImpLoc, DiagID) << method->getDeclName(); 786 else 787 Diag(method->getLocation(), DiagID) << method->getDeclName(); 788} 789 790/// Determines if type B can be substituted for type A. Returns true if we can 791/// guarantee that anything that the user will do to an object of type A can 792/// also be done to an object of type B. This is trivially true if the two 793/// types are the same, or if B is a subclass of A. It becomes more complex 794/// in cases where protocols are involved. 795/// 796/// Object types in Objective-C describe the minimum requirements for an 797/// object, rather than providing a complete description of a type. For 798/// example, if A is a subclass of B, then B* may refer to an instance of A. 799/// The principle of substitutability means that we may use an instance of A 800/// anywhere that we may use an instance of B - it will implement all of the 801/// ivars of B and all of the methods of B. 802/// 803/// This substitutability is important when type checking methods, because 804/// the implementation may have stricter type definitions than the interface. 805/// The interface specifies minimum requirements, but the implementation may 806/// have more accurate ones. For example, a method may privately accept 807/// instances of B, but only publish that it accepts instances of A. Any 808/// object passed to it will be type checked against B, and so will implicitly 809/// by a valid A*. Similarly, a method may return a subclass of the class that 810/// it is declared as returning. 811/// 812/// This is most important when considering subclassing. A method in a 813/// subclass must accept any object as an argument that its superclass's 814/// implementation accepts. It may, however, accept a more general type 815/// without breaking substitutability (i.e. you can still use the subclass 816/// anywhere that you can use the superclass, but not vice versa). The 817/// converse requirement applies to return types: the return type for a 818/// subclass method must be a valid object of the kind that the superclass 819/// advertises, but it may be specified more accurately. This avoids the need 820/// for explicit down-casting by callers. 821/// 822/// Note: This is a stricter requirement than for assignment. 823static bool isObjCTypeSubstitutable(ASTContext &Context, 824 const ObjCObjectPointerType *A, 825 const ObjCObjectPointerType *B, 826 bool rejectId) { 827 // Reject a protocol-unqualified id. 828 if (rejectId && B->isObjCIdType()) return false; 829 830 // If B is a qualified id, then A must also be a qualified id and it must 831 // implement all of the protocols in B. It may not be a qualified class. 832 // For example, MyClass<A> can be assigned to id<A>, but MyClass<A> is a 833 // stricter definition so it is not substitutable for id<A>. 834 if (B->isObjCQualifiedIdType()) { 835 return A->isObjCQualifiedIdType() && 836 Context.ObjCQualifiedIdTypesAreCompatible(QualType(A, 0), 837 QualType(B,0), 838 false); 839 } 840 841 /* 842 // id is a special type that bypasses type checking completely. We want a 843 // warning when it is used in one place but not another. 844 if (C.isObjCIdType(A) || C.isObjCIdType(B)) return false; 845 846 847 // If B is a qualified id, then A must also be a qualified id (which it isn't 848 // if we've got this far) 849 if (B->isObjCQualifiedIdType()) return false; 850 */ 851 852 // Now we know that A and B are (potentially-qualified) class types. The 853 // normal rules for assignment apply. 854 return Context.canAssignObjCInterfaces(A, B); 855} 856 857static SourceRange getTypeRange(TypeSourceInfo *TSI) { 858 return (TSI ? TSI->getTypeLoc().getSourceRange() : SourceRange()); 859} 860 861static void CheckMethodOverrideReturn(Sema &S, 862 ObjCMethodDecl *MethodImpl, 863 ObjCMethodDecl *MethodIface) { 864 if (S.Context.hasSameUnqualifiedType(MethodImpl->getResultType(), 865 MethodIface->getResultType())) 866 return; 867 868 unsigned DiagID = diag::warn_conflicting_ret_types; 869 870 // Mismatches between ObjC pointers go into a different warning 871 // category, and sometimes they're even completely whitelisted. 872 if (const ObjCObjectPointerType *ImplPtrTy = 873 MethodImpl->getResultType()->getAs<ObjCObjectPointerType>()) { 874 if (const ObjCObjectPointerType *IfacePtrTy = 875 MethodIface->getResultType()->getAs<ObjCObjectPointerType>()) { 876 // Allow non-matching return types as long as they don't violate 877 // the principle of substitutability. Specifically, we permit 878 // return types that are subclasses of the declared return type, 879 // or that are more-qualified versions of the declared type. 880 if (isObjCTypeSubstitutable(S.Context, IfacePtrTy, ImplPtrTy, false)) 881 return; 882 883 DiagID = diag::warn_non_covariant_ret_types; 884 } 885 } 886 887 S.Diag(MethodImpl->getLocation(), DiagID) 888 << MethodImpl->getDeclName() 889 << MethodIface->getResultType() 890 << MethodImpl->getResultType() 891 << getTypeRange(MethodImpl->getResultTypeSourceInfo()); 892 S.Diag(MethodIface->getLocation(), diag::note_previous_definition) 893 << getTypeRange(MethodIface->getResultTypeSourceInfo()); 894} 895 896static void CheckMethodOverrideParam(Sema &S, 897 ObjCMethodDecl *MethodImpl, 898 ObjCMethodDecl *MethodIface, 899 ParmVarDecl *ImplVar, 900 ParmVarDecl *IfaceVar) { 901 QualType ImplTy = ImplVar->getType(); 902 QualType IfaceTy = IfaceVar->getType(); 903 if (S.Context.hasSameUnqualifiedType(ImplTy, IfaceTy)) 904 return; 905 906 unsigned DiagID = diag::warn_conflicting_param_types; 907 908 // Mismatches between ObjC pointers go into a different warning 909 // category, and sometimes they're even completely whitelisted. 910 if (const ObjCObjectPointerType *ImplPtrTy = 911 ImplTy->getAs<ObjCObjectPointerType>()) { 912 if (const ObjCObjectPointerType *IfacePtrTy = 913 IfaceTy->getAs<ObjCObjectPointerType>()) { 914 // Allow non-matching argument types as long as they don't 915 // violate the principle of substitutability. Specifically, the 916 // implementation must accept any objects that the superclass 917 // accepts, however it may also accept others. 918 if (isObjCTypeSubstitutable(S.Context, ImplPtrTy, IfacePtrTy, true)) 919 return; 920 921 DiagID = diag::warn_non_contravariant_param_types; 922 } 923 } 924 925 S.Diag(ImplVar->getLocation(), DiagID) 926 << getTypeRange(ImplVar->getTypeSourceInfo()) 927 << MethodImpl->getDeclName() << IfaceTy << ImplTy; 928 S.Diag(IfaceVar->getLocation(), diag::note_previous_definition) 929 << getTypeRange(IfaceVar->getTypeSourceInfo()); 930} 931 932 933void Sema::WarnConflictingTypedMethods(ObjCMethodDecl *ImpMethodDecl, 934 ObjCMethodDecl *IntfMethodDecl) { 935 CheckMethodOverrideReturn(*this, ImpMethodDecl, IntfMethodDecl); 936 937 for (ObjCMethodDecl::param_iterator IM = ImpMethodDecl->param_begin(), 938 IF = IntfMethodDecl->param_begin(), EM = ImpMethodDecl->param_end(); 939 IM != EM; ++IM, ++IF) 940 CheckMethodOverrideParam(*this, ImpMethodDecl, IntfMethodDecl, *IM, *IF); 941 942 if (ImpMethodDecl->isVariadic() != IntfMethodDecl->isVariadic()) { 943 Diag(ImpMethodDecl->getLocation(), diag::warn_conflicting_variadic); 944 Diag(IntfMethodDecl->getLocation(), diag::note_previous_declaration); 945 } 946} 947 948/// FIXME: Type hierarchies in Objective-C can be deep. We could most likely 949/// improve the efficiency of selector lookups and type checking by associating 950/// with each protocol / interface / category the flattened instance tables. If 951/// we used an immutable set to keep the table then it wouldn't add significant 952/// memory cost and it would be handy for lookups. 953 954/// CheckProtocolMethodDefs - This routine checks unimplemented methods 955/// Declared in protocol, and those referenced by it. 956void Sema::CheckProtocolMethodDefs(SourceLocation ImpLoc, 957 ObjCProtocolDecl *PDecl, 958 bool& IncompleteImpl, 959 const llvm::DenseSet<Selector> &InsMap, 960 const llvm::DenseSet<Selector> &ClsMap, 961 ObjCContainerDecl *CDecl) { 962 ObjCInterfaceDecl *IDecl; 963 if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl)) 964 IDecl = C->getClassInterface(); 965 else 966 IDecl = dyn_cast<ObjCInterfaceDecl>(CDecl); 967 assert (IDecl && "CheckProtocolMethodDefs - IDecl is null"); 968 969 ObjCInterfaceDecl *Super = IDecl->getSuperClass(); 970 ObjCInterfaceDecl *NSIDecl = 0; 971 if (getLangOptions().NeXTRuntime) { 972 // check to see if class implements forwardInvocation method and objects 973 // of this class are derived from 'NSProxy' so that to forward requests 974 // from one object to another. 975 // Under such conditions, which means that every method possible is 976 // implemented in the class, we should not issue "Method definition not 977 // found" warnings. 978 // FIXME: Use a general GetUnarySelector method for this. 979 IdentifierInfo* II = &Context.Idents.get("forwardInvocation"); 980 Selector fISelector = Context.Selectors.getSelector(1, &II); 981 if (InsMap.count(fISelector)) 982 // Is IDecl derived from 'NSProxy'? If so, no instance methods 983 // need be implemented in the implementation. 984 NSIDecl = IDecl->lookupInheritedClass(&Context.Idents.get("NSProxy")); 985 } 986 987 // If a method lookup fails locally we still need to look and see if 988 // the method was implemented by a base class or an inherited 989 // protocol. This lookup is slow, but occurs rarely in correct code 990 // and otherwise would terminate in a warning. 991 992 // check unimplemented instance methods. 993 if (!NSIDecl) 994 for (ObjCProtocolDecl::instmeth_iterator I = PDecl->instmeth_begin(), 995 E = PDecl->instmeth_end(); I != E; ++I) { 996 ObjCMethodDecl *method = *I; 997 if (method->getImplementationControl() != ObjCMethodDecl::Optional && 998 !method->isSynthesized() && !InsMap.count(method->getSelector()) && 999 (!Super || 1000 !Super->lookupInstanceMethod(method->getSelector()))) { 1001 // Ugly, but necessary. Method declared in protcol might have 1002 // have been synthesized due to a property declared in the class which 1003 // uses the protocol. 1004 ObjCMethodDecl *MethodInClass = 1005 IDecl->lookupInstanceMethod(method->getSelector()); 1006 if (!MethodInClass || !MethodInClass->isSynthesized()) { 1007 unsigned DIAG = diag::warn_unimplemented_protocol_method; 1008 if (Diags.getDiagnosticLevel(DIAG, ImpLoc) 1009 != Diagnostic::Ignored) { 1010 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG); 1011 Diag(method->getLocation(), diag::note_method_declared_at); 1012 Diag(CDecl->getLocation(), diag::note_required_for_protocol_at) 1013 << PDecl->getDeclName(); 1014 } 1015 } 1016 } 1017 } 1018 // check unimplemented class methods 1019 for (ObjCProtocolDecl::classmeth_iterator 1020 I = PDecl->classmeth_begin(), E = PDecl->classmeth_end(); 1021 I != E; ++I) { 1022 ObjCMethodDecl *method = *I; 1023 if (method->getImplementationControl() != ObjCMethodDecl::Optional && 1024 !ClsMap.count(method->getSelector()) && 1025 (!Super || !Super->lookupClassMethod(method->getSelector()))) { 1026 unsigned DIAG = diag::warn_unimplemented_protocol_method; 1027 if (Diags.getDiagnosticLevel(DIAG, ImpLoc) != Diagnostic::Ignored) { 1028 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG); 1029 Diag(method->getLocation(), diag::note_method_declared_at); 1030 Diag(IDecl->getLocation(), diag::note_required_for_protocol_at) << 1031 PDecl->getDeclName(); 1032 } 1033 } 1034 } 1035 // Check on this protocols's referenced protocols, recursively. 1036 for (ObjCProtocolDecl::protocol_iterator PI = PDecl->protocol_begin(), 1037 E = PDecl->protocol_end(); PI != E; ++PI) 1038 CheckProtocolMethodDefs(ImpLoc, *PI, IncompleteImpl, InsMap, ClsMap, IDecl); 1039} 1040 1041/// MatchAllMethodDeclarations - Check methods declaraed in interface or 1042/// or protocol against those declared in their implementations. 1043/// 1044void Sema::MatchAllMethodDeclarations(const llvm::DenseSet<Selector> &InsMap, 1045 const llvm::DenseSet<Selector> &ClsMap, 1046 llvm::DenseSet<Selector> &InsMapSeen, 1047 llvm::DenseSet<Selector> &ClsMapSeen, 1048 ObjCImplDecl* IMPDecl, 1049 ObjCContainerDecl* CDecl, 1050 bool &IncompleteImpl, 1051 bool ImmediateClass) { 1052 // Check and see if instance methods in class interface have been 1053 // implemented in the implementation class. If so, their types match. 1054 for (ObjCInterfaceDecl::instmeth_iterator I = CDecl->instmeth_begin(), 1055 E = CDecl->instmeth_end(); I != E; ++I) { 1056 if (InsMapSeen.count((*I)->getSelector())) 1057 continue; 1058 InsMapSeen.insert((*I)->getSelector()); 1059 if (!(*I)->isSynthesized() && 1060 !InsMap.count((*I)->getSelector())) { 1061 if (ImmediateClass) 1062 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl, 1063 diag::note_undef_method_impl); 1064 continue; 1065 } else { 1066 ObjCMethodDecl *ImpMethodDecl = 1067 IMPDecl->getInstanceMethod((*I)->getSelector()); 1068 ObjCMethodDecl *IntfMethodDecl = 1069 CDecl->getInstanceMethod((*I)->getSelector()); 1070 assert(IntfMethodDecl && 1071 "IntfMethodDecl is null in ImplMethodsVsClassMethods"); 1072 // ImpMethodDecl may be null as in a @dynamic property. 1073 if (ImpMethodDecl) 1074 WarnConflictingTypedMethods(ImpMethodDecl, IntfMethodDecl); 1075 } 1076 } 1077 1078 // Check and see if class methods in class interface have been 1079 // implemented in the implementation class. If so, their types match. 1080 for (ObjCInterfaceDecl::classmeth_iterator 1081 I = CDecl->classmeth_begin(), E = CDecl->classmeth_end(); I != E; ++I) { 1082 if (ClsMapSeen.count((*I)->getSelector())) 1083 continue; 1084 ClsMapSeen.insert((*I)->getSelector()); 1085 if (!ClsMap.count((*I)->getSelector())) { 1086 if (ImmediateClass) 1087 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl, 1088 diag::note_undef_method_impl); 1089 } else { 1090 ObjCMethodDecl *ImpMethodDecl = 1091 IMPDecl->getClassMethod((*I)->getSelector()); 1092 ObjCMethodDecl *IntfMethodDecl = 1093 CDecl->getClassMethod((*I)->getSelector()); 1094 WarnConflictingTypedMethods(ImpMethodDecl, IntfMethodDecl); 1095 } 1096 } 1097 1098 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) { 1099 // Also methods in class extensions need be looked at next. 1100 for (const ObjCCategoryDecl *ClsExtDecl = I->getFirstClassExtension(); 1101 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) 1102 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1103 IMPDecl, 1104 const_cast<ObjCCategoryDecl *>(ClsExtDecl), 1105 IncompleteImpl, false); 1106 1107 // Check for any implementation of a methods declared in protocol. 1108 for (ObjCInterfaceDecl::all_protocol_iterator 1109 PI = I->all_referenced_protocol_begin(), 1110 E = I->all_referenced_protocol_end(); PI != E; ++PI) 1111 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1112 IMPDecl, 1113 (*PI), IncompleteImpl, false); 1114 if (I->getSuperClass()) 1115 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1116 IMPDecl, 1117 I->getSuperClass(), IncompleteImpl, false); 1118 } 1119} 1120 1121void Sema::ImplMethodsVsClassMethods(Scope *S, ObjCImplDecl* IMPDecl, 1122 ObjCContainerDecl* CDecl, 1123 bool IncompleteImpl) { 1124 llvm::DenseSet<Selector> InsMap; 1125 // Check and see if instance methods in class interface have been 1126 // implemented in the implementation class. 1127 for (ObjCImplementationDecl::instmeth_iterator 1128 I = IMPDecl->instmeth_begin(), E = IMPDecl->instmeth_end(); I!=E; ++I) 1129 InsMap.insert((*I)->getSelector()); 1130 1131 // Check and see if properties declared in the interface have either 1) 1132 // an implementation or 2) there is a @synthesize/@dynamic implementation 1133 // of the property in the @implementation. 1134 if (isa<ObjCInterfaceDecl>(CDecl) && 1135 !(LangOpts.ObjCDefaultSynthProperties && LangOpts.ObjCNonFragileABI2)) 1136 DiagnoseUnimplementedProperties(S, IMPDecl, CDecl, InsMap); 1137 1138 llvm::DenseSet<Selector> ClsMap; 1139 for (ObjCImplementationDecl::classmeth_iterator 1140 I = IMPDecl->classmeth_begin(), 1141 E = IMPDecl->classmeth_end(); I != E; ++I) 1142 ClsMap.insert((*I)->getSelector()); 1143 1144 // Check for type conflict of methods declared in a class/protocol and 1145 // its implementation; if any. 1146 llvm::DenseSet<Selector> InsMapSeen, ClsMapSeen; 1147 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1148 IMPDecl, CDecl, 1149 IncompleteImpl, true); 1150 1151 // Check the protocol list for unimplemented methods in the @implementation 1152 // class. 1153 // Check and see if class methods in class interface have been 1154 // implemented in the implementation class. 1155 1156 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) { 1157 for (ObjCInterfaceDecl::all_protocol_iterator 1158 PI = I->all_referenced_protocol_begin(), 1159 E = I->all_referenced_protocol_end(); PI != E; ++PI) 1160 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl, 1161 InsMap, ClsMap, I); 1162 // Check class extensions (unnamed categories) 1163 for (const ObjCCategoryDecl *Categories = I->getFirstClassExtension(); 1164 Categories; Categories = Categories->getNextClassExtension()) 1165 ImplMethodsVsClassMethods(S, IMPDecl, 1166 const_cast<ObjCCategoryDecl*>(Categories), 1167 IncompleteImpl); 1168 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl)) { 1169 // For extended class, unimplemented methods in its protocols will 1170 // be reported in the primary class. 1171 if (!C->IsClassExtension()) { 1172 for (ObjCCategoryDecl::protocol_iterator PI = C->protocol_begin(), 1173 E = C->protocol_end(); PI != E; ++PI) 1174 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl, 1175 InsMap, ClsMap, CDecl); 1176 // Report unimplemented properties in the category as well. 1177 // When reporting on missing setter/getters, do not report when 1178 // setter/getter is implemented in category's primary class 1179 // implementation. 1180 if (ObjCInterfaceDecl *ID = C->getClassInterface()) 1181 if (ObjCImplDecl *IMP = ID->getImplementation()) { 1182 for (ObjCImplementationDecl::instmeth_iterator 1183 I = IMP->instmeth_begin(), E = IMP->instmeth_end(); I!=E; ++I) 1184 InsMap.insert((*I)->getSelector()); 1185 } 1186 DiagnoseUnimplementedProperties(S, IMPDecl, CDecl, InsMap); 1187 } 1188 } else 1189 assert(false && "invalid ObjCContainerDecl type."); 1190} 1191 1192/// ActOnForwardClassDeclaration - 1193Decl * 1194Sema::ActOnForwardClassDeclaration(SourceLocation AtClassLoc, 1195 IdentifierInfo **IdentList, 1196 SourceLocation *IdentLocs, 1197 unsigned NumElts) { 1198 llvm::SmallVector<ObjCInterfaceDecl*, 32> Interfaces; 1199 1200 for (unsigned i = 0; i != NumElts; ++i) { 1201 // Check for another declaration kind with the same name. 1202 NamedDecl *PrevDecl 1203 = LookupSingleName(TUScope, IdentList[i], IdentLocs[i], 1204 LookupOrdinaryName, ForRedeclaration); 1205 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1206 // Maybe we will complain about the shadowed template parameter. 1207 DiagnoseTemplateParameterShadow(AtClassLoc, PrevDecl); 1208 // Just pretend that we didn't see the previous declaration. 1209 PrevDecl = 0; 1210 } 1211 1212 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 1213 // GCC apparently allows the following idiom: 1214 // 1215 // typedef NSObject < XCElementTogglerP > XCElementToggler; 1216 // @class XCElementToggler; 1217 // 1218 // FIXME: Make an extension? 1219 TypedefDecl *TDD = dyn_cast<TypedefDecl>(PrevDecl); 1220 if (!TDD || !TDD->getUnderlyingType()->isObjCObjectType()) { 1221 Diag(AtClassLoc, diag::err_redefinition_different_kind) << IdentList[i]; 1222 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1223 } else { 1224 // a forward class declaration matching a typedef name of a class refers 1225 // to the underlying class. 1226 if (const ObjCObjectType *OI = 1227 TDD->getUnderlyingType()->getAs<ObjCObjectType>()) 1228 PrevDecl = OI->getInterface(); 1229 } 1230 } 1231 ObjCInterfaceDecl *IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 1232 if (!IDecl) { // Not already seen? Make a forward decl. 1233 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtClassLoc, 1234 IdentList[i], IdentLocs[i], true); 1235 1236 // Push the ObjCInterfaceDecl on the scope chain but do *not* add it to 1237 // the current DeclContext. This prevents clients that walk DeclContext 1238 // from seeing the imaginary ObjCInterfaceDecl until it is actually 1239 // declared later (if at all). We also take care to explicitly make 1240 // sure this declaration is visible for name lookup. 1241 PushOnScopeChains(IDecl, TUScope, false); 1242 CurContext->makeDeclVisibleInContext(IDecl, true); 1243 } 1244 1245 Interfaces.push_back(IDecl); 1246 } 1247 1248 assert(Interfaces.size() == NumElts); 1249 ObjCClassDecl *CDecl = ObjCClassDecl::Create(Context, CurContext, AtClassLoc, 1250 Interfaces.data(), IdentLocs, 1251 Interfaces.size()); 1252 CurContext->addDecl(CDecl); 1253 CheckObjCDeclScope(CDecl); 1254 return CDecl; 1255} 1256 1257 1258/// MatchTwoMethodDeclarations - Checks that two methods have matching type and 1259/// returns true, or false, accordingly. 1260/// TODO: Handle protocol list; such as id<p1,p2> in type comparisons 1261bool Sema::MatchTwoMethodDeclarations(const ObjCMethodDecl *Method, 1262 const ObjCMethodDecl *PrevMethod, 1263 bool matchBasedOnSizeAndAlignment, 1264 bool matchBasedOnStrictEqulity) { 1265 QualType T1 = Context.getCanonicalType(Method->getResultType()); 1266 QualType T2 = Context.getCanonicalType(PrevMethod->getResultType()); 1267 1268 if (T1 != T2) { 1269 // The result types are different. 1270 if (!matchBasedOnSizeAndAlignment || matchBasedOnStrictEqulity) 1271 return false; 1272 // Incomplete types don't have a size and alignment. 1273 if (T1->isIncompleteType() || T2->isIncompleteType()) 1274 return false; 1275 // Check is based on size and alignment. 1276 if (Context.getTypeInfo(T1) != Context.getTypeInfo(T2)) 1277 return false; 1278 } 1279 1280 ObjCMethodDecl::param_iterator ParamI = Method->param_begin(), 1281 E = Method->param_end(); 1282 ObjCMethodDecl::param_iterator PrevI = PrevMethod->param_begin(); 1283 1284 for (; ParamI != E; ++ParamI, ++PrevI) { 1285 assert(PrevI != PrevMethod->param_end() && "Param mismatch"); 1286 T1 = Context.getCanonicalType((*ParamI)->getType()); 1287 T2 = Context.getCanonicalType((*PrevI)->getType()); 1288 if (T1 != T2) { 1289 // The result types are different. 1290 if (!matchBasedOnSizeAndAlignment || matchBasedOnStrictEqulity) 1291 return false; 1292 // Incomplete types don't have a size and alignment. 1293 if (T1->isIncompleteType() || T2->isIncompleteType()) 1294 return false; 1295 // Check is based on size and alignment. 1296 if (Context.getTypeInfo(T1) != Context.getTypeInfo(T2)) 1297 return false; 1298 } 1299 } 1300 return true; 1301} 1302 1303/// \brief Read the contents of the method pool for a given selector from 1304/// external storage. 1305/// 1306/// This routine should only be called once, when the method pool has no entry 1307/// for this selector. 1308Sema::GlobalMethodPool::iterator Sema::ReadMethodPool(Selector Sel) { 1309 assert(ExternalSource && "We need an external AST source"); 1310 assert(MethodPool.find(Sel) == MethodPool.end() && 1311 "Selector data already loaded into the method pool"); 1312 1313 // Read the method list from the external source. 1314 GlobalMethods Methods = ExternalSource->ReadMethodPool(Sel); 1315 1316 return MethodPool.insert(std::make_pair(Sel, Methods)).first; 1317} 1318 1319void Sema::AddMethodToGlobalPool(ObjCMethodDecl *Method, bool impl, 1320 bool instance) { 1321 GlobalMethodPool::iterator Pos = MethodPool.find(Method->getSelector()); 1322 if (Pos == MethodPool.end()) { 1323 if (ExternalSource) 1324 Pos = ReadMethodPool(Method->getSelector()); 1325 else 1326 Pos = MethodPool.insert(std::make_pair(Method->getSelector(), 1327 GlobalMethods())).first; 1328 } 1329 Method->setDefined(impl); 1330 ObjCMethodList &Entry = instance ? Pos->second.first : Pos->second.second; 1331 if (Entry.Method == 0) { 1332 // Haven't seen a method with this selector name yet - add it. 1333 Entry.Method = Method; 1334 Entry.Next = 0; 1335 return; 1336 } 1337 1338 // We've seen a method with this name, see if we have already seen this type 1339 // signature. 1340 for (ObjCMethodList *List = &Entry; List; List = List->Next) 1341 if (MatchTwoMethodDeclarations(Method, List->Method)) { 1342 ObjCMethodDecl *PrevObjCMethod = List->Method; 1343 PrevObjCMethod->setDefined(impl); 1344 // If a method is deprecated, push it in the global pool. 1345 // This is used for better diagnostics. 1346 if (Method->getAttr<DeprecatedAttr>()) { 1347 if (!PrevObjCMethod->getAttr<DeprecatedAttr>()) 1348 List->Method = Method; 1349 } 1350 // If new method is unavailable, push it into global pool 1351 // unless previous one is deprecated. 1352 if (Method->getAttr<UnavailableAttr>()) { 1353 if (!PrevObjCMethod->getAttr<UnavailableAttr>() && 1354 !PrevObjCMethod->getAttr<DeprecatedAttr>()) 1355 List->Method = Method; 1356 } 1357 return; 1358 } 1359 1360 // We have a new signature for an existing method - add it. 1361 // This is extremely rare. Only 1% of Cocoa selectors are "overloaded". 1362 ObjCMethodList *Mem = BumpAlloc.Allocate<ObjCMethodList>(); 1363 Entry.Next = new (Mem) ObjCMethodList(Method, Entry.Next); 1364} 1365 1366ObjCMethodDecl *Sema::LookupMethodInGlobalPool(Selector Sel, SourceRange R, 1367 bool receiverIdOrClass, 1368 bool warn, bool instance) { 1369 GlobalMethodPool::iterator Pos = MethodPool.find(Sel); 1370 if (Pos == MethodPool.end()) { 1371 if (ExternalSource) 1372 Pos = ReadMethodPool(Sel); 1373 else 1374 return 0; 1375 } 1376 1377 ObjCMethodList &MethList = instance ? Pos->second.first : Pos->second.second; 1378 1379 bool strictSelectorMatch = receiverIdOrClass && warn && 1380 (Diags.getDiagnosticLevel(diag::warn_strict_multiple_method_decl, 1381 R.getBegin()) != 1382 Diagnostic::Ignored); 1383 if (warn && MethList.Method && MethList.Next) { 1384 bool issueWarning = false; 1385 if (strictSelectorMatch) 1386 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) { 1387 // This checks if the methods differ in type mismatch. 1388 if (!MatchTwoMethodDeclarations(MethList.Method, Next->Method, false, true)) 1389 issueWarning = true; 1390 } 1391 1392 if (!issueWarning) 1393 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) { 1394 // This checks if the methods differ by size & alignment. 1395 if (!MatchTwoMethodDeclarations(MethList.Method, Next->Method, true)) 1396 issueWarning = true; 1397 } 1398 1399 if (issueWarning) { 1400 if (strictSelectorMatch) 1401 Diag(R.getBegin(), diag::warn_strict_multiple_method_decl) << Sel << R; 1402 else 1403 Diag(R.getBegin(), diag::warn_multiple_method_decl) << Sel << R; 1404 Diag(MethList.Method->getLocStart(), diag::note_using) 1405 << MethList.Method->getSourceRange(); 1406 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) 1407 Diag(Next->Method->getLocStart(), diag::note_also_found) 1408 << Next->Method->getSourceRange(); 1409 } 1410 } 1411 return MethList.Method; 1412} 1413 1414ObjCMethodDecl *Sema::LookupImplementedMethodInGlobalPool(Selector Sel) { 1415 GlobalMethodPool::iterator Pos = MethodPool.find(Sel); 1416 if (Pos == MethodPool.end()) 1417 return 0; 1418 1419 GlobalMethods &Methods = Pos->second; 1420 1421 if (Methods.first.Method && Methods.first.Method->isDefined()) 1422 return Methods.first.Method; 1423 if (Methods.second.Method && Methods.second.Method->isDefined()) 1424 return Methods.second.Method; 1425 return 0; 1426} 1427 1428/// CompareMethodParamsInBaseAndSuper - This routine compares methods with 1429/// identical selector names in current and its super classes and issues 1430/// a warning if any of their argument types are incompatible. 1431void Sema::CompareMethodParamsInBaseAndSuper(Decl *ClassDecl, 1432 ObjCMethodDecl *Method, 1433 bool IsInstance) { 1434 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(ClassDecl); 1435 if (ID == 0) return; 1436 1437 while (ObjCInterfaceDecl *SD = ID->getSuperClass()) { 1438 ObjCMethodDecl *SuperMethodDecl = 1439 SD->lookupMethod(Method->getSelector(), IsInstance); 1440 if (SuperMethodDecl == 0) { 1441 ID = SD; 1442 continue; 1443 } 1444 ObjCMethodDecl::param_iterator ParamI = Method->param_begin(), 1445 E = Method->param_end(); 1446 ObjCMethodDecl::param_iterator PrevI = SuperMethodDecl->param_begin(); 1447 for (; ParamI != E; ++ParamI, ++PrevI) { 1448 // Number of parameters are the same and is guaranteed by selector match. 1449 assert(PrevI != SuperMethodDecl->param_end() && "Param mismatch"); 1450 QualType T1 = Context.getCanonicalType((*ParamI)->getType()); 1451 QualType T2 = Context.getCanonicalType((*PrevI)->getType()); 1452 // If type of arguement of method in this class does not match its 1453 // respective argument type in the super class method, issue warning; 1454 if (!Context.typesAreCompatible(T1, T2)) { 1455 Diag((*ParamI)->getLocation(), diag::ext_typecheck_base_super) 1456 << T1 << T2; 1457 Diag(SuperMethodDecl->getLocation(), diag::note_previous_declaration); 1458 return; 1459 } 1460 } 1461 ID = SD; 1462 } 1463} 1464 1465/// DiagnoseDuplicateIvars - 1466/// Check for duplicate ivars in the entire class at the start of 1467/// @implementation. This becomes necesssary because class extension can 1468/// add ivars to a class in random order which will not be known until 1469/// class's @implementation is seen. 1470void Sema::DiagnoseDuplicateIvars(ObjCInterfaceDecl *ID, 1471 ObjCInterfaceDecl *SID) { 1472 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 1473 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 1474 ObjCIvarDecl* Ivar = (*IVI); 1475 if (Ivar->isInvalidDecl()) 1476 continue; 1477 if (IdentifierInfo *II = Ivar->getIdentifier()) { 1478 ObjCIvarDecl* prevIvar = SID->lookupInstanceVariable(II); 1479 if (prevIvar) { 1480 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 1481 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 1482 Ivar->setInvalidDecl(); 1483 } 1484 } 1485 } 1486} 1487 1488// Note: For class/category implemenations, allMethods/allProperties is 1489// always null. 1490void Sema::ActOnAtEnd(Scope *S, SourceRange AtEnd, 1491 Decl *ClassDecl, 1492 Decl **allMethods, unsigned allNum, 1493 Decl **allProperties, unsigned pNum, 1494 DeclGroupPtrTy *allTUVars, unsigned tuvNum) { 1495 // FIXME: If we don't have a ClassDecl, we have an error. We should consider 1496 // always passing in a decl. If the decl has an error, isInvalidDecl() 1497 // should be true. 1498 if (!ClassDecl) 1499 return; 1500 1501 bool isInterfaceDeclKind = 1502 isa<ObjCInterfaceDecl>(ClassDecl) || isa<ObjCCategoryDecl>(ClassDecl) 1503 || isa<ObjCProtocolDecl>(ClassDecl); 1504 bool checkIdenticalMethods = isa<ObjCImplementationDecl>(ClassDecl); 1505 1506 if (!isInterfaceDeclKind && AtEnd.isInvalid()) { 1507 // FIXME: This is wrong. We shouldn't be pretending that there is 1508 // an '@end' in the declaration. 1509 SourceLocation L = ClassDecl->getLocation(); 1510 AtEnd.setBegin(L); 1511 AtEnd.setEnd(L); 1512 Diag(L, diag::warn_missing_atend); 1513 } 1514 1515 // FIXME: Remove these and use the ObjCContainerDecl/DeclContext. 1516 llvm::DenseMap<Selector, const ObjCMethodDecl*> InsMap; 1517 llvm::DenseMap<Selector, const ObjCMethodDecl*> ClsMap; 1518 1519 for (unsigned i = 0; i < allNum; i++ ) { 1520 ObjCMethodDecl *Method = 1521 cast_or_null<ObjCMethodDecl>(allMethods[i]); 1522 1523 if (!Method) continue; // Already issued a diagnostic. 1524 if (Method->isInstanceMethod()) { 1525 /// Check for instance method of the same name with incompatible types 1526 const ObjCMethodDecl *&PrevMethod = InsMap[Method->getSelector()]; 1527 bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod) 1528 : false; 1529 if ((isInterfaceDeclKind && PrevMethod && !match) 1530 || (checkIdenticalMethods && match)) { 1531 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 1532 << Method->getDeclName(); 1533 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 1534 Method->setInvalidDecl(); 1535 } else { 1536 InsMap[Method->getSelector()] = Method; 1537 /// The following allows us to typecheck messages to "id". 1538 AddInstanceMethodToGlobalPool(Method); 1539 // verify that the instance method conforms to the same definition of 1540 // parent methods if it shadows one. 1541 CompareMethodParamsInBaseAndSuper(ClassDecl, Method, true); 1542 } 1543 } else { 1544 /// Check for class method of the same name with incompatible types 1545 const ObjCMethodDecl *&PrevMethod = ClsMap[Method->getSelector()]; 1546 bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod) 1547 : false; 1548 if ((isInterfaceDeclKind && PrevMethod && !match) 1549 || (checkIdenticalMethods && match)) { 1550 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 1551 << Method->getDeclName(); 1552 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 1553 Method->setInvalidDecl(); 1554 } else { 1555 ClsMap[Method->getSelector()] = Method; 1556 /// The following allows us to typecheck messages to "Class". 1557 AddFactoryMethodToGlobalPool(Method); 1558 // verify that the class method conforms to the same definition of 1559 // parent methods if it shadows one. 1560 CompareMethodParamsInBaseAndSuper(ClassDecl, Method, false); 1561 } 1562 } 1563 } 1564 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl>(ClassDecl)) { 1565 // Compares properties declared in this class to those of its 1566 // super class. 1567 ComparePropertiesInBaseAndSuper(I); 1568 CompareProperties(I, I); 1569 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(ClassDecl)) { 1570 // Categories are used to extend the class by declaring new methods. 1571 // By the same token, they are also used to add new properties. No 1572 // need to compare the added property to those in the class. 1573 1574 // Compare protocol properties with those in category 1575 CompareProperties(C, C); 1576 if (C->IsClassExtension()) { 1577 ObjCInterfaceDecl *CCPrimary = C->getClassInterface(); 1578 DiagnoseClassExtensionDupMethods(C, CCPrimary); 1579 } 1580 } 1581 if (ObjCContainerDecl *CDecl = dyn_cast<ObjCContainerDecl>(ClassDecl)) { 1582 if (CDecl->getIdentifier()) 1583 // ProcessPropertyDecl is responsible for diagnosing conflicts with any 1584 // user-defined setter/getter. It also synthesizes setter/getter methods 1585 // and adds them to the DeclContext and global method pools. 1586 for (ObjCContainerDecl::prop_iterator I = CDecl->prop_begin(), 1587 E = CDecl->prop_end(); 1588 I != E; ++I) 1589 ProcessPropertyDecl(*I, CDecl); 1590 CDecl->setAtEndRange(AtEnd); 1591 } 1592 if (ObjCImplementationDecl *IC=dyn_cast<ObjCImplementationDecl>(ClassDecl)) { 1593 IC->setAtEndRange(AtEnd); 1594 if (ObjCInterfaceDecl* IDecl = IC->getClassInterface()) { 1595 // Any property declared in a class extension might have user 1596 // declared setter or getter in current class extension or one 1597 // of the other class extensions. Mark them as synthesized as 1598 // property will be synthesized when property with same name is 1599 // seen in the @implementation. 1600 for (const ObjCCategoryDecl *ClsExtDecl = 1601 IDecl->getFirstClassExtension(); 1602 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 1603 for (ObjCContainerDecl::prop_iterator I = ClsExtDecl->prop_begin(), 1604 E = ClsExtDecl->prop_end(); I != E; ++I) { 1605 ObjCPropertyDecl *Property = (*I); 1606 // Skip over properties declared @dynamic 1607 if (const ObjCPropertyImplDecl *PIDecl 1608 = IC->FindPropertyImplDecl(Property->getIdentifier())) 1609 if (PIDecl->getPropertyImplementation() 1610 == ObjCPropertyImplDecl::Dynamic) 1611 continue; 1612 1613 for (const ObjCCategoryDecl *CExtDecl = 1614 IDecl->getFirstClassExtension(); 1615 CExtDecl; CExtDecl = CExtDecl->getNextClassExtension()) { 1616 if (ObjCMethodDecl *GetterMethod = 1617 CExtDecl->getInstanceMethod(Property->getGetterName())) 1618 GetterMethod->setSynthesized(true); 1619 if (!Property->isReadOnly()) 1620 if (ObjCMethodDecl *SetterMethod = 1621 CExtDecl->getInstanceMethod(Property->getSetterName())) 1622 SetterMethod->setSynthesized(true); 1623 } 1624 } 1625 } 1626 1627 if (LangOpts.ObjCDefaultSynthProperties && 1628 LangOpts.ObjCNonFragileABI2) 1629 DefaultSynthesizeProperties(S, IC, IDecl); 1630 ImplMethodsVsClassMethods(S, IC, IDecl); 1631 AtomicPropertySetterGetterRules(IC, IDecl); 1632 1633 if (LangOpts.ObjCNonFragileABI2) 1634 while (IDecl->getSuperClass()) { 1635 DiagnoseDuplicateIvars(IDecl, IDecl->getSuperClass()); 1636 IDecl = IDecl->getSuperClass(); 1637 } 1638 } 1639 SetIvarInitializers(IC); 1640 } else if (ObjCCategoryImplDecl* CatImplClass = 1641 dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) { 1642 CatImplClass->setAtEndRange(AtEnd); 1643 1644 // Find category interface decl and then check that all methods declared 1645 // in this interface are implemented in the category @implementation. 1646 if (ObjCInterfaceDecl* IDecl = CatImplClass->getClassInterface()) { 1647 for (ObjCCategoryDecl *Categories = IDecl->getCategoryList(); 1648 Categories; Categories = Categories->getNextClassCategory()) { 1649 if (Categories->getIdentifier() == CatImplClass->getIdentifier()) { 1650 ImplMethodsVsClassMethods(S, CatImplClass, Categories); 1651 break; 1652 } 1653 } 1654 } 1655 } 1656 if (isInterfaceDeclKind) { 1657 // Reject invalid vardecls. 1658 for (unsigned i = 0; i != tuvNum; i++) { 1659 DeclGroupRef DG = allTUVars[i].getAsVal<DeclGroupRef>(); 1660 for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I) 1661 if (VarDecl *VDecl = dyn_cast<VarDecl>(*I)) { 1662 if (!VDecl->hasExternalStorage()) 1663 Diag(VDecl->getLocation(), diag::err_objc_var_decl_inclass); 1664 } 1665 } 1666 } 1667} 1668 1669 1670/// CvtQTToAstBitMask - utility routine to produce an AST bitmask for 1671/// objective-c's type qualifier from the parser version of the same info. 1672static Decl::ObjCDeclQualifier 1673CvtQTToAstBitMask(ObjCDeclSpec::ObjCDeclQualifier PQTVal) { 1674 Decl::ObjCDeclQualifier ret = Decl::OBJC_TQ_None; 1675 if (PQTVal & ObjCDeclSpec::DQ_In) 1676 ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_In); 1677 if (PQTVal & ObjCDeclSpec::DQ_Inout) 1678 ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Inout); 1679 if (PQTVal & ObjCDeclSpec::DQ_Out) 1680 ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Out); 1681 if (PQTVal & ObjCDeclSpec::DQ_Bycopy) 1682 ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Bycopy); 1683 if (PQTVal & ObjCDeclSpec::DQ_Byref) 1684 ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Byref); 1685 if (PQTVal & ObjCDeclSpec::DQ_Oneway) 1686 ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Oneway); 1687 1688 return ret; 1689} 1690 1691static inline 1692bool containsInvalidMethodImplAttribute(const AttrVec &A) { 1693 // The 'ibaction' attribute is allowed on method definitions because of 1694 // how the IBAction macro is used on both method declarations and definitions. 1695 // If the method definitions contains any other attributes, return true. 1696 for (AttrVec::const_iterator i = A.begin(), e = A.end(); i != e; ++i) 1697 if ((*i)->getKind() != attr::IBAction) 1698 return true; 1699 return false; 1700} 1701 1702Decl *Sema::ActOnMethodDeclaration( 1703 Scope *S, 1704 SourceLocation MethodLoc, SourceLocation EndLoc, 1705 tok::TokenKind MethodType, Decl *ClassDecl, 1706 ObjCDeclSpec &ReturnQT, ParsedType ReturnType, 1707 Selector Sel, 1708 // optional arguments. The number of types/arguments is obtained 1709 // from the Sel.getNumArgs(). 1710 ObjCArgInfo *ArgInfo, 1711 DeclaratorChunk::ParamInfo *CParamInfo, unsigned CNumArgs, // c-style args 1712 AttributeList *AttrList, tok::ObjCKeywordKind MethodDeclKind, 1713 bool isVariadic) { 1714 // Make sure we can establish a context for the method. 1715 if (!ClassDecl) { 1716 Diag(MethodLoc, diag::error_missing_method_context); 1717 getCurFunction()->LabelMap.clear(); 1718 return 0; 1719 } 1720 QualType resultDeclType; 1721 1722 TypeSourceInfo *ResultTInfo = 0; 1723 if (ReturnType) { 1724 resultDeclType = GetTypeFromParser(ReturnType, &ResultTInfo); 1725 1726 // Methods cannot return interface types. All ObjC objects are 1727 // passed by reference. 1728 if (resultDeclType->isObjCObjectType()) { 1729 Diag(MethodLoc, diag::err_object_cannot_be_passed_returned_by_value) 1730 << 0 << resultDeclType; 1731 return 0; 1732 } 1733 } else // get the type for "id". 1734 resultDeclType = Context.getObjCIdType(); 1735 1736 ObjCMethodDecl* ObjCMethod = 1737 ObjCMethodDecl::Create(Context, MethodLoc, EndLoc, Sel, resultDeclType, 1738 ResultTInfo, 1739 cast<DeclContext>(ClassDecl), 1740 MethodType == tok::minus, isVariadic, 1741 false, false, 1742 MethodDeclKind == tok::objc_optional ? 1743 ObjCMethodDecl::Optional : 1744 ObjCMethodDecl::Required); 1745 1746 llvm::SmallVector<ParmVarDecl*, 16> Params; 1747 1748 for (unsigned i = 0, e = Sel.getNumArgs(); i != e; ++i) { 1749 QualType ArgType; 1750 TypeSourceInfo *DI; 1751 1752 if (ArgInfo[i].Type == 0) { 1753 ArgType = Context.getObjCIdType(); 1754 DI = 0; 1755 } else { 1756 ArgType = GetTypeFromParser(ArgInfo[i].Type, &DI); 1757 // Perform the default array/function conversions (C99 6.7.5.3p[7,8]). 1758 ArgType = adjustParameterType(ArgType); 1759 } 1760 1761 LookupResult R(*this, ArgInfo[i].Name, ArgInfo[i].NameLoc, 1762 LookupOrdinaryName, ForRedeclaration); 1763 LookupName(R, S); 1764 if (R.isSingleResult()) { 1765 NamedDecl *PrevDecl = R.getFoundDecl(); 1766 if (S->isDeclScope(PrevDecl)) { 1767 // FIXME. This should be an error; but will break projects. 1768 Diag(ArgInfo[i].NameLoc, diag::warn_method_param_redefinition) 1769 << ArgInfo[i].Name; 1770 Diag(PrevDecl->getLocation(), 1771 diag::note_previous_declaration); 1772 } 1773 } 1774 1775 ParmVarDecl* Param 1776 = ParmVarDecl::Create(Context, ObjCMethod, ArgInfo[i].NameLoc, 1777 ArgInfo[i].Name, ArgType, DI, 1778 SC_None, SC_None, 0); 1779 1780 if (ArgType->isObjCObjectType()) { 1781 Diag(ArgInfo[i].NameLoc, 1782 diag::err_object_cannot_be_passed_returned_by_value) 1783 << 1 << ArgType; 1784 Param->setInvalidDecl(); 1785 } 1786 1787 Param->setObjCDeclQualifier( 1788 CvtQTToAstBitMask(ArgInfo[i].DeclSpec.getObjCDeclQualifier())); 1789 1790 // Apply the attributes to the parameter. 1791 ProcessDeclAttributeList(TUScope, Param, ArgInfo[i].ArgAttrs); 1792 1793 S->AddDecl(Param); 1794 IdResolver.AddDecl(Param); 1795 1796 Params.push_back(Param); 1797 } 1798 1799 for (unsigned i = 0, e = CNumArgs; i != e; ++i) { 1800 ParmVarDecl *Param = cast<ParmVarDecl>(CParamInfo[i].Param); 1801 QualType ArgType = Param->getType(); 1802 if (ArgType.isNull()) 1803 ArgType = Context.getObjCIdType(); 1804 else 1805 // Perform the default array/function conversions (C99 6.7.5.3p[7,8]). 1806 ArgType = adjustParameterType(ArgType); 1807 if (ArgType->isObjCObjectType()) { 1808 Diag(Param->getLocation(), 1809 diag::err_object_cannot_be_passed_returned_by_value) 1810 << 1 << ArgType; 1811 Param->setInvalidDecl(); 1812 } 1813 Param->setDeclContext(ObjCMethod); 1814 1815 Params.push_back(Param); 1816 } 1817 1818 ObjCMethod->setMethodParams(Context, Params.data(), Params.size(), 1819 Sel.getNumArgs()); 1820 ObjCMethod->setObjCDeclQualifier( 1821 CvtQTToAstBitMask(ReturnQT.getObjCDeclQualifier())); 1822 const ObjCMethodDecl *PrevMethod = 0; 1823 1824 if (AttrList) 1825 ProcessDeclAttributeList(TUScope, ObjCMethod, AttrList); 1826 1827 const ObjCMethodDecl *InterfaceMD = 0; 1828 1829 // Add the method now. 1830 if (ObjCImplementationDecl *ImpDecl = 1831 dyn_cast<ObjCImplementationDecl>(ClassDecl)) { 1832 if (MethodType == tok::minus) { 1833 PrevMethod = ImpDecl->getInstanceMethod(Sel); 1834 ImpDecl->addInstanceMethod(ObjCMethod); 1835 } else { 1836 PrevMethod = ImpDecl->getClassMethod(Sel); 1837 ImpDecl->addClassMethod(ObjCMethod); 1838 } 1839 InterfaceMD = ImpDecl->getClassInterface()->getMethod(Sel, 1840 MethodType == tok::minus); 1841 if (ObjCMethod->hasAttrs() && 1842 containsInvalidMethodImplAttribute(ObjCMethod->getAttrs())) 1843 Diag(EndLoc, diag::warn_attribute_method_def); 1844 } else if (ObjCCategoryImplDecl *CatImpDecl = 1845 dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) { 1846 if (MethodType == tok::minus) { 1847 PrevMethod = CatImpDecl->getInstanceMethod(Sel); 1848 CatImpDecl->addInstanceMethod(ObjCMethod); 1849 } else { 1850 PrevMethod = CatImpDecl->getClassMethod(Sel); 1851 CatImpDecl->addClassMethod(ObjCMethod); 1852 } 1853 if (ObjCMethod->hasAttrs() && 1854 containsInvalidMethodImplAttribute(ObjCMethod->getAttrs())) 1855 Diag(EndLoc, diag::warn_attribute_method_def); 1856 } else { 1857 cast<DeclContext>(ClassDecl)->addDecl(ObjCMethod); 1858 } 1859 if (PrevMethod) { 1860 // You can never have two method definitions with the same name. 1861 Diag(ObjCMethod->getLocation(), diag::err_duplicate_method_decl) 1862 << ObjCMethod->getDeclName(); 1863 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 1864 } 1865 1866 // If the interface declared this method, and it was deprecated there, 1867 // mark it deprecated here. 1868 if (InterfaceMD) 1869 if (Attr *DA = InterfaceMD->getAttr<DeprecatedAttr>()) { 1870 StringLiteral *SE = StringLiteral::CreateEmpty(Context, 1); 1871 ObjCMethod->addAttr(::new (Context) 1872 DeprecatedAttr(DA->getLocation(), 1873 Context, 1874 SE->getString())); 1875 } 1876 1877 return ObjCMethod; 1878} 1879 1880bool Sema::CheckObjCDeclScope(Decl *D) { 1881 if (isa<TranslationUnitDecl>(CurContext->getRedeclContext())) 1882 return false; 1883 1884 Diag(D->getLocation(), diag::err_objc_decls_may_only_appear_in_global_scope); 1885 D->setInvalidDecl(); 1886 1887 return true; 1888} 1889 1890/// Called whenever @defs(ClassName) is encountered in the source. Inserts the 1891/// instance variables of ClassName into Decls. 1892void Sema::ActOnDefs(Scope *S, Decl *TagD, SourceLocation DeclStart, 1893 IdentifierInfo *ClassName, 1894 llvm::SmallVectorImpl<Decl*> &Decls) { 1895 // Check that ClassName is a valid class 1896 ObjCInterfaceDecl *Class = getObjCInterfaceDecl(ClassName, DeclStart); 1897 if (!Class) { 1898 Diag(DeclStart, diag::err_undef_interface) << ClassName; 1899 return; 1900 } 1901 if (LangOpts.ObjCNonFragileABI) { 1902 Diag(DeclStart, diag::err_atdef_nonfragile_interface); 1903 return; 1904 } 1905 1906 // Collect the instance variables 1907 llvm::SmallVector<ObjCIvarDecl*, 32> Ivars; 1908 Context.DeepCollectObjCIvars(Class, true, Ivars); 1909 // For each ivar, create a fresh ObjCAtDefsFieldDecl. 1910 for (unsigned i = 0; i < Ivars.size(); i++) { 1911 FieldDecl* ID = cast<FieldDecl>(Ivars[i]); 1912 RecordDecl *Record = dyn_cast<RecordDecl>(TagD); 1913 Decl *FD = ObjCAtDefsFieldDecl::Create(Context, Record, ID->getLocation(), 1914 ID->getIdentifier(), ID->getType(), 1915 ID->getBitWidth()); 1916 Decls.push_back(FD); 1917 } 1918 1919 // Introduce all of these fields into the appropriate scope. 1920 for (llvm::SmallVectorImpl<Decl*>::iterator D = Decls.begin(); 1921 D != Decls.end(); ++D) { 1922 FieldDecl *FD = cast<FieldDecl>(*D); 1923 if (getLangOptions().CPlusPlus) 1924 PushOnScopeChains(cast<FieldDecl>(FD), S); 1925 else if (RecordDecl *Record = dyn_cast<RecordDecl>(TagD)) 1926 Record->addDecl(FD); 1927 } 1928} 1929 1930/// \brief Build a type-check a new Objective-C exception variable declaration. 1931VarDecl *Sema::BuildObjCExceptionDecl(TypeSourceInfo *TInfo, 1932 QualType T, 1933 IdentifierInfo *Name, 1934 SourceLocation NameLoc, 1935 bool Invalid) { 1936 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 1937 // duration shall not be qualified by an address-space qualifier." 1938 // Since all parameters have automatic store duration, they can not have 1939 // an address space. 1940 if (T.getAddressSpace() != 0) { 1941 Diag(NameLoc, diag::err_arg_with_address_space); 1942 Invalid = true; 1943 } 1944 1945 // An @catch parameter must be an unqualified object pointer type; 1946 // FIXME: Recover from "NSObject foo" by inserting the * in "NSObject *foo"? 1947 if (Invalid) { 1948 // Don't do any further checking. 1949 } else if (T->isDependentType()) { 1950 // Okay: we don't know what this type will instantiate to. 1951 } else if (!T->isObjCObjectPointerType()) { 1952 Invalid = true; 1953 Diag(NameLoc ,diag::err_catch_param_not_objc_type); 1954 } else if (T->isObjCQualifiedIdType()) { 1955 Invalid = true; 1956 Diag(NameLoc, diag::err_illegal_qualifiers_on_catch_parm); 1957 } 1958 1959 VarDecl *New = VarDecl::Create(Context, CurContext, NameLoc, Name, T, TInfo, 1960 SC_None, SC_None); 1961 New->setExceptionVariable(true); 1962 1963 if (Invalid) 1964 New->setInvalidDecl(); 1965 return New; 1966} 1967 1968Decl *Sema::ActOnObjCExceptionDecl(Scope *S, Declarator &D) { 1969 const DeclSpec &DS = D.getDeclSpec(); 1970 1971 // We allow the "register" storage class on exception variables because 1972 // GCC did, but we drop it completely. Any other storage class is an error. 1973 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 1974 Diag(DS.getStorageClassSpecLoc(), diag::warn_register_objc_catch_parm) 1975 << FixItHint::CreateRemoval(SourceRange(DS.getStorageClassSpecLoc())); 1976 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 1977 Diag(DS.getStorageClassSpecLoc(), diag::err_storage_spec_on_catch_parm) 1978 << DS.getStorageClassSpec(); 1979 } 1980 if (D.getDeclSpec().isThreadSpecified()) 1981 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 1982 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1983 1984 DiagnoseFunctionSpecifiers(D); 1985 1986 // Check that there are no default arguments inside the type of this 1987 // exception object (C++ only). 1988 if (getLangOptions().CPlusPlus) 1989 CheckExtraCXXDefaultArguments(D); 1990 1991 TagDecl *OwnedDecl = 0; 1992 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 1993 QualType ExceptionType = TInfo->getType(); 1994 1995 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 1996 // Objective-C++: Types shall not be defined in exception types. 1997 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 1998 << Context.getTypeDeclType(OwnedDecl); 1999 } 2000 2001 VarDecl *New = BuildObjCExceptionDecl(TInfo, ExceptionType, D.getIdentifier(), 2002 D.getIdentifierLoc(), 2003 D.isInvalidType()); 2004 2005 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 2006 if (D.getCXXScopeSpec().isSet()) { 2007 Diag(D.getIdentifierLoc(), diag::err_qualified_objc_catch_parm) 2008 << D.getCXXScopeSpec().getRange(); 2009 New->setInvalidDecl(); 2010 } 2011 2012 // Add the parameter declaration into this scope. 2013 S->AddDecl(New); 2014 if (D.getIdentifier()) 2015 IdResolver.AddDecl(New); 2016 2017 ProcessDeclAttributes(S, New, D); 2018 2019 if (New->hasAttr<BlocksAttr>()) 2020 Diag(New->getLocation(), diag::err_block_on_nonlocal); 2021 return New; 2022} 2023 2024/// CollectIvarsToConstructOrDestruct - Collect those ivars which require 2025/// initialization. 2026void Sema::CollectIvarsToConstructOrDestruct(ObjCInterfaceDecl *OI, 2027 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 2028 for (ObjCIvarDecl *Iv = OI->all_declared_ivar_begin(); Iv; 2029 Iv= Iv->getNextIvar()) { 2030 QualType QT = Context.getBaseElementType(Iv->getType()); 2031 if (QT->isRecordType()) 2032 Ivars.push_back(Iv); 2033 } 2034} 2035 2036void ObjCImplementationDecl::setIvarInitializers(ASTContext &C, 2037 CXXCtorInitializer ** initializers, 2038 unsigned numInitializers) { 2039 if (numInitializers > 0) { 2040 NumIvarInitializers = numInitializers; 2041 CXXCtorInitializer **ivarInitializers = 2042 new (C) CXXCtorInitializer*[NumIvarInitializers]; 2043 memcpy(ivarInitializers, initializers, 2044 numInitializers * sizeof(CXXCtorInitializer*)); 2045 IvarInitializers = ivarInitializers; 2046 } 2047} 2048 2049void Sema::DiagnoseUseOfUnimplementedSelectors() { 2050 // Warning will be issued only when selector table is 2051 // generated (which means there is at lease one implementation 2052 // in the TU). This is to match gcc's behavior. 2053 if (ReferencedSelectors.empty() || 2054 !Context.AnyObjCImplementation()) 2055 return; 2056 for (llvm::DenseMap<Selector, SourceLocation>::iterator S = 2057 ReferencedSelectors.begin(), 2058 E = ReferencedSelectors.end(); S != E; ++S) { 2059 Selector Sel = (*S).first; 2060 if (!LookupImplementedMethodInGlobalPool(Sel)) 2061 Diag((*S).second, diag::warn_unimplemented_selector) << Sel; 2062 } 2063 return; 2064} 2065