SemaDeclObjC.cpp revision 221345
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 if (ND && ND->isDeprecated()) { 32 S.Diag(ImplLoc, diag::warn_deprecated_def) << select; 33 if (select == 0) 34 S.Diag(ND->getLocation(), diag::note_method_declared_at); 35 else 36 S.Diag(ND->getLocation(), diag::note_previous_decl) << "class"; 37 } 38} 39 40/// ActOnStartOfObjCMethodDef - This routine sets up parameters; invisible 41/// and user declared, in the method definition's AST. 42void Sema::ActOnStartOfObjCMethodDef(Scope *FnBodyScope, Decl *D) { 43 assert(getCurMethodDecl() == 0 && "Method parsing confused"); 44 ObjCMethodDecl *MDecl = dyn_cast_or_null<ObjCMethodDecl>(D); 45 46 // If we don't have a valid method decl, simply return. 47 if (!MDecl) 48 return; 49 50 // Allow the rest of sema to find private method decl implementations. 51 if (MDecl->isInstanceMethod()) 52 AddInstanceMethodToGlobalPool(MDecl, true); 53 else 54 AddFactoryMethodToGlobalPool(MDecl, true); 55 56 // Allow all of Sema to see that we are entering a method definition. 57 PushDeclContext(FnBodyScope, MDecl); 58 PushFunctionScope(); 59 60 // Create Decl objects for each parameter, entrring them in the scope for 61 // binding to their use. 62 63 // Insert the invisible arguments, self and _cmd! 64 MDecl->createImplicitParams(Context, MDecl->getClassInterface()); 65 66 PushOnScopeChains(MDecl->getSelfDecl(), FnBodyScope); 67 PushOnScopeChains(MDecl->getCmdDecl(), FnBodyScope); 68 69 // Introduce all of the other parameters into this scope. 70 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(), 71 E = MDecl->param_end(); PI != E; ++PI) { 72 ParmVarDecl *Param = (*PI); 73 if (!Param->isInvalidDecl() && 74 RequireCompleteType(Param->getLocation(), Param->getType(), 75 diag::err_typecheck_decl_incomplete_type)) 76 Param->setInvalidDecl(); 77 if ((*PI)->getIdentifier()) 78 PushOnScopeChains(*PI, FnBodyScope); 79 } 80 // Warn on implementating deprecated methods under 81 // -Wdeprecated-implementations flag. 82 if (ObjCInterfaceDecl *IC = MDecl->getClassInterface()) 83 if (ObjCMethodDecl *IMD = 84 IC->lookupMethod(MDecl->getSelector(), MDecl->isInstanceMethod())) 85 DiagnoseObjCImplementedDeprecations(*this, 86 dyn_cast<NamedDecl>(IMD), 87 MDecl->getLocation(), 0); 88} 89 90Decl *Sema:: 91ActOnStartClassInterface(SourceLocation AtInterfaceLoc, 92 IdentifierInfo *ClassName, SourceLocation ClassLoc, 93 IdentifierInfo *SuperName, SourceLocation SuperLoc, 94 Decl * const *ProtoRefs, unsigned NumProtoRefs, 95 const SourceLocation *ProtoLocs, 96 SourceLocation EndProtoLoc, AttributeList *AttrList) { 97 assert(ClassName && "Missing class identifier"); 98 99 // Check for another declaration kind with the same name. 100 NamedDecl *PrevDecl = LookupSingleName(TUScope, ClassName, ClassLoc, 101 LookupOrdinaryName, ForRedeclaration); 102 103 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 104 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName; 105 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 106 } 107 108 ObjCInterfaceDecl* IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 109 if (IDecl) { 110 // Class already seen. Is it a forward declaration? 111 if (!IDecl->isForwardDecl()) { 112 IDecl->setInvalidDecl(); 113 Diag(AtInterfaceLoc, diag::err_duplicate_class_def)<<IDecl->getDeclName(); 114 Diag(IDecl->getLocation(), diag::note_previous_definition); 115 116 // Return the previous class interface. 117 // FIXME: don't leak the objects passed in! 118 return IDecl; 119 } else { 120 IDecl->setLocation(AtInterfaceLoc); 121 IDecl->setForwardDecl(false); 122 IDecl->setClassLoc(ClassLoc); 123 // If the forward decl was in a PCH, we need to write it again in a 124 // dependent AST file. 125 IDecl->setChangedSinceDeserialization(true); 126 127 // Since this ObjCInterfaceDecl was created by a forward declaration, 128 // we now add it to the DeclContext since it wasn't added before 129 // (see ActOnForwardClassDeclaration). 130 IDecl->setLexicalDeclContext(CurContext); 131 CurContext->addDecl(IDecl); 132 133 if (AttrList) 134 ProcessDeclAttributeList(TUScope, IDecl, AttrList); 135 } 136 } else { 137 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtInterfaceLoc, 138 ClassName, ClassLoc); 139 if (AttrList) 140 ProcessDeclAttributeList(TUScope, IDecl, AttrList); 141 142 PushOnScopeChains(IDecl, TUScope); 143 } 144 145 if (SuperName) { 146 // Check if a different kind of symbol declared in this scope. 147 PrevDecl = LookupSingleName(TUScope, SuperName, SuperLoc, 148 LookupOrdinaryName); 149 150 if (!PrevDecl) { 151 // Try to correct for a typo in the superclass name. 152 LookupResult R(*this, SuperName, SuperLoc, LookupOrdinaryName); 153 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 154 (PrevDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 155 Diag(SuperLoc, diag::err_undef_superclass_suggest) 156 << SuperName << ClassName << PrevDecl->getDeclName(); 157 Diag(PrevDecl->getLocation(), diag::note_previous_decl) 158 << PrevDecl->getDeclName(); 159 } 160 } 161 162 if (PrevDecl == IDecl) { 163 Diag(SuperLoc, diag::err_recursive_superclass) 164 << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc); 165 IDecl->setLocEnd(ClassLoc); 166 } else { 167 ObjCInterfaceDecl *SuperClassDecl = 168 dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 169 170 // Diagnose classes that inherit from deprecated classes. 171 if (SuperClassDecl) 172 (void)DiagnoseUseOfDecl(SuperClassDecl, SuperLoc); 173 174 if (PrevDecl && SuperClassDecl == 0) { 175 // The previous declaration was not a class decl. Check if we have a 176 // typedef. If we do, get the underlying class type. 177 if (const TypedefNameDecl *TDecl = 178 dyn_cast_or_null<TypedefNameDecl>(PrevDecl)) { 179 QualType T = TDecl->getUnderlyingType(); 180 if (T->isObjCObjectType()) { 181 if (NamedDecl *IDecl = T->getAs<ObjCObjectType>()->getInterface()) 182 SuperClassDecl = dyn_cast<ObjCInterfaceDecl>(IDecl); 183 } 184 } 185 186 // This handles the following case: 187 // 188 // typedef int SuperClass; 189 // @interface MyClass : SuperClass {} @end 190 // 191 if (!SuperClassDecl) { 192 Diag(SuperLoc, diag::err_redefinition_different_kind) << SuperName; 193 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 194 } 195 } 196 197 if (!dyn_cast_or_null<TypedefNameDecl>(PrevDecl)) { 198 if (!SuperClassDecl) 199 Diag(SuperLoc, diag::err_undef_superclass) 200 << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc); 201 else if (SuperClassDecl->isForwardDecl()) 202 Diag(SuperLoc, diag::err_undef_superclass) 203 << SuperClassDecl->getDeclName() << ClassName 204 << SourceRange(AtInterfaceLoc, ClassLoc); 205 } 206 IDecl->setSuperClass(SuperClassDecl); 207 IDecl->setSuperClassLoc(SuperLoc); 208 IDecl->setLocEnd(SuperLoc); 209 } 210 } else { // we have a root class. 211 IDecl->setLocEnd(ClassLoc); 212 } 213 214 // Check then save referenced protocols. 215 if (NumProtoRefs) { 216 IDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs, 217 ProtoLocs, Context); 218 IDecl->setLocEnd(EndProtoLoc); 219 } 220 221 CheckObjCDeclScope(IDecl); 222 return IDecl; 223} 224 225/// ActOnCompatiblityAlias - this action is called after complete parsing of 226/// @compatibility_alias declaration. It sets up the alias relationships. 227Decl *Sema::ActOnCompatiblityAlias(SourceLocation AtLoc, 228 IdentifierInfo *AliasName, 229 SourceLocation AliasLocation, 230 IdentifierInfo *ClassName, 231 SourceLocation ClassLocation) { 232 // Look for previous declaration of alias name 233 NamedDecl *ADecl = LookupSingleName(TUScope, AliasName, AliasLocation, 234 LookupOrdinaryName, ForRedeclaration); 235 if (ADecl) { 236 if (isa<ObjCCompatibleAliasDecl>(ADecl)) 237 Diag(AliasLocation, diag::warn_previous_alias_decl); 238 else 239 Diag(AliasLocation, diag::err_conflicting_aliasing_type) << AliasName; 240 Diag(ADecl->getLocation(), diag::note_previous_declaration); 241 return 0; 242 } 243 // Check for class declaration 244 NamedDecl *CDeclU = LookupSingleName(TUScope, ClassName, ClassLocation, 245 LookupOrdinaryName, ForRedeclaration); 246 if (const TypedefNameDecl *TDecl = 247 dyn_cast_or_null<TypedefNameDecl>(CDeclU)) { 248 QualType T = TDecl->getUnderlyingType(); 249 if (T->isObjCObjectType()) { 250 if (NamedDecl *IDecl = T->getAs<ObjCObjectType>()->getInterface()) { 251 ClassName = IDecl->getIdentifier(); 252 CDeclU = LookupSingleName(TUScope, ClassName, ClassLocation, 253 LookupOrdinaryName, ForRedeclaration); 254 } 255 } 256 } 257 ObjCInterfaceDecl *CDecl = dyn_cast_or_null<ObjCInterfaceDecl>(CDeclU); 258 if (CDecl == 0) { 259 Diag(ClassLocation, diag::warn_undef_interface) << ClassName; 260 if (CDeclU) 261 Diag(CDeclU->getLocation(), diag::note_previous_declaration); 262 return 0; 263 } 264 265 // Everything checked out, instantiate a new alias declaration AST. 266 ObjCCompatibleAliasDecl *AliasDecl = 267 ObjCCompatibleAliasDecl::Create(Context, CurContext, AtLoc, AliasName, CDecl); 268 269 if (!CheckObjCDeclScope(AliasDecl)) 270 PushOnScopeChains(AliasDecl, TUScope); 271 272 return AliasDecl; 273} 274 275void Sema::CheckForwardProtocolDeclarationForCircularDependency( 276 IdentifierInfo *PName, 277 SourceLocation &Ploc, SourceLocation PrevLoc, 278 const ObjCList<ObjCProtocolDecl> &PList) { 279 for (ObjCList<ObjCProtocolDecl>::iterator I = PList.begin(), 280 E = PList.end(); I != E; ++I) { 281 282 if (ObjCProtocolDecl *PDecl = LookupProtocol((*I)->getIdentifier(), 283 Ploc)) { 284 if (PDecl->getIdentifier() == PName) { 285 Diag(Ploc, diag::err_protocol_has_circular_dependency); 286 Diag(PrevLoc, diag::note_previous_definition); 287 } 288 CheckForwardProtocolDeclarationForCircularDependency(PName, Ploc, 289 PDecl->getLocation(), PDecl->getReferencedProtocols()); 290 } 291 } 292} 293 294Decl * 295Sema::ActOnStartProtocolInterface(SourceLocation AtProtoInterfaceLoc, 296 IdentifierInfo *ProtocolName, 297 SourceLocation ProtocolLoc, 298 Decl * const *ProtoRefs, 299 unsigned NumProtoRefs, 300 const SourceLocation *ProtoLocs, 301 SourceLocation EndProtoLoc, 302 AttributeList *AttrList) { 303 // FIXME: Deal with AttrList. 304 assert(ProtocolName && "Missing protocol identifier"); 305 ObjCProtocolDecl *PDecl = LookupProtocol(ProtocolName, ProtocolLoc); 306 if (PDecl) { 307 // Protocol already seen. Better be a forward protocol declaration 308 if (!PDecl->isForwardDecl()) { 309 Diag(ProtocolLoc, diag::warn_duplicate_protocol_def) << ProtocolName; 310 Diag(PDecl->getLocation(), diag::note_previous_definition); 311 // Just return the protocol we already had. 312 // FIXME: don't leak the objects passed in! 313 return PDecl; 314 } 315 ObjCList<ObjCProtocolDecl> PList; 316 PList.set((ObjCProtocolDecl *const*)ProtoRefs, NumProtoRefs, Context); 317 CheckForwardProtocolDeclarationForCircularDependency( 318 ProtocolName, ProtocolLoc, PDecl->getLocation(), PList); 319 320 // Make sure the cached decl gets a valid start location. 321 PDecl->setLocation(AtProtoInterfaceLoc); 322 PDecl->setForwardDecl(false); 323 CurContext->addDecl(PDecl); 324 // Repeat in dependent AST files. 325 PDecl->setChangedSinceDeserialization(true); 326 } else { 327 PDecl = ObjCProtocolDecl::Create(Context, CurContext, 328 AtProtoInterfaceLoc,ProtocolName); 329 PushOnScopeChains(PDecl, TUScope); 330 PDecl->setForwardDecl(false); 331 } 332 if (AttrList) 333 ProcessDeclAttributeList(TUScope, PDecl, AttrList); 334 if (NumProtoRefs) { 335 /// Check then save referenced protocols. 336 PDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs, 337 ProtoLocs, Context); 338 PDecl->setLocEnd(EndProtoLoc); 339 } 340 341 CheckObjCDeclScope(PDecl); 342 return PDecl; 343} 344 345/// FindProtocolDeclaration - This routine looks up protocols and 346/// issues an error if they are not declared. It returns list of 347/// protocol declarations in its 'Protocols' argument. 348void 349Sema::FindProtocolDeclaration(bool WarnOnDeclarations, 350 const IdentifierLocPair *ProtocolId, 351 unsigned NumProtocols, 352 llvm::SmallVectorImpl<Decl *> &Protocols) { 353 for (unsigned i = 0; i != NumProtocols; ++i) { 354 ObjCProtocolDecl *PDecl = LookupProtocol(ProtocolId[i].first, 355 ProtocolId[i].second); 356 if (!PDecl) { 357 LookupResult R(*this, ProtocolId[i].first, ProtocolId[i].second, 358 LookupObjCProtocolName); 359 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 360 (PDecl = R.getAsSingle<ObjCProtocolDecl>())) { 361 Diag(ProtocolId[i].second, diag::err_undeclared_protocol_suggest) 362 << ProtocolId[i].first << R.getLookupName(); 363 Diag(PDecl->getLocation(), diag::note_previous_decl) 364 << PDecl->getDeclName(); 365 } 366 } 367 368 if (!PDecl) { 369 Diag(ProtocolId[i].second, diag::err_undeclared_protocol) 370 << ProtocolId[i].first; 371 continue; 372 } 373 374 (void)DiagnoseUseOfDecl(PDecl, ProtocolId[i].second); 375 376 // If this is a forward declaration and we are supposed to warn in this 377 // case, do it. 378 if (WarnOnDeclarations && PDecl->isForwardDecl()) 379 Diag(ProtocolId[i].second, diag::warn_undef_protocolref) 380 << ProtocolId[i].first; 381 Protocols.push_back(PDecl); 382 } 383} 384 385/// DiagnoseClassExtensionDupMethods - Check for duplicate declaration of 386/// a class method in its extension. 387/// 388void Sema::DiagnoseClassExtensionDupMethods(ObjCCategoryDecl *CAT, 389 ObjCInterfaceDecl *ID) { 390 if (!ID) 391 return; // Possibly due to previous error 392 393 llvm::DenseMap<Selector, const ObjCMethodDecl*> MethodMap; 394 for (ObjCInterfaceDecl::method_iterator i = ID->meth_begin(), 395 e = ID->meth_end(); i != e; ++i) { 396 ObjCMethodDecl *MD = *i; 397 MethodMap[MD->getSelector()] = MD; 398 } 399 400 if (MethodMap.empty()) 401 return; 402 for (ObjCCategoryDecl::method_iterator i = CAT->meth_begin(), 403 e = CAT->meth_end(); i != e; ++i) { 404 ObjCMethodDecl *Method = *i; 405 const ObjCMethodDecl *&PrevMethod = MethodMap[Method->getSelector()]; 406 if (PrevMethod && !MatchTwoMethodDeclarations(Method, PrevMethod)) { 407 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 408 << Method->getDeclName(); 409 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 410 } 411 } 412} 413 414/// ActOnForwardProtocolDeclaration - Handle @protocol foo; 415Decl * 416Sema::ActOnForwardProtocolDeclaration(SourceLocation AtProtocolLoc, 417 const IdentifierLocPair *IdentList, 418 unsigned NumElts, 419 AttributeList *attrList) { 420 llvm::SmallVector<ObjCProtocolDecl*, 32> Protocols; 421 llvm::SmallVector<SourceLocation, 8> ProtoLocs; 422 423 for (unsigned i = 0; i != NumElts; ++i) { 424 IdentifierInfo *Ident = IdentList[i].first; 425 ObjCProtocolDecl *PDecl = LookupProtocol(Ident, IdentList[i].second); 426 bool isNew = false; 427 if (PDecl == 0) { // Not already seen? 428 PDecl = ObjCProtocolDecl::Create(Context, CurContext, 429 IdentList[i].second, Ident); 430 PushOnScopeChains(PDecl, TUScope, false); 431 isNew = true; 432 } 433 if (attrList) { 434 ProcessDeclAttributeList(TUScope, PDecl, attrList); 435 if (!isNew) 436 PDecl->setChangedSinceDeserialization(true); 437 } 438 Protocols.push_back(PDecl); 439 ProtoLocs.push_back(IdentList[i].second); 440 } 441 442 ObjCForwardProtocolDecl *PDecl = 443 ObjCForwardProtocolDecl::Create(Context, CurContext, AtProtocolLoc, 444 Protocols.data(), Protocols.size(), 445 ProtoLocs.data()); 446 CurContext->addDecl(PDecl); 447 CheckObjCDeclScope(PDecl); 448 return PDecl; 449} 450 451Decl *Sema:: 452ActOnStartCategoryInterface(SourceLocation AtInterfaceLoc, 453 IdentifierInfo *ClassName, SourceLocation ClassLoc, 454 IdentifierInfo *CategoryName, 455 SourceLocation CategoryLoc, 456 Decl * const *ProtoRefs, 457 unsigned NumProtoRefs, 458 const SourceLocation *ProtoLocs, 459 SourceLocation EndProtoLoc) { 460 ObjCCategoryDecl *CDecl; 461 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true); 462 463 /// Check that class of this category is already completely declared. 464 if (!IDecl || IDecl->isForwardDecl()) { 465 // Create an invalid ObjCCategoryDecl to serve as context for 466 // the enclosing method declarations. We mark the decl invalid 467 // to make it clear that this isn't a valid AST. 468 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc, 469 ClassLoc, CategoryLoc, CategoryName); 470 CDecl->setInvalidDecl(); 471 Diag(ClassLoc, diag::err_undef_interface) << ClassName; 472 return CDecl; 473 } 474 475 if (!CategoryName && IDecl->getImplementation()) { 476 Diag(ClassLoc, diag::err_class_extension_after_impl) << ClassName; 477 Diag(IDecl->getImplementation()->getLocation(), 478 diag::note_implementation_declared); 479 } 480 481 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc, 482 ClassLoc, CategoryLoc, CategoryName); 483 // FIXME: PushOnScopeChains? 484 CurContext->addDecl(CDecl); 485 486 CDecl->setClassInterface(IDecl); 487 // Insert class extension to the list of class's categories. 488 if (!CategoryName) 489 CDecl->insertNextClassCategory(); 490 491 // If the interface is deprecated, warn about it. 492 (void)DiagnoseUseOfDecl(IDecl, ClassLoc); 493 494 if (CategoryName) { 495 /// Check for duplicate interface declaration for this category 496 ObjCCategoryDecl *CDeclChain; 497 for (CDeclChain = IDecl->getCategoryList(); CDeclChain; 498 CDeclChain = CDeclChain->getNextClassCategory()) { 499 if (CDeclChain->getIdentifier() == CategoryName) { 500 // Class extensions can be declared multiple times. 501 Diag(CategoryLoc, diag::warn_dup_category_def) 502 << ClassName << CategoryName; 503 Diag(CDeclChain->getLocation(), diag::note_previous_definition); 504 break; 505 } 506 } 507 if (!CDeclChain) 508 CDecl->insertNextClassCategory(); 509 } 510 511 if (NumProtoRefs) { 512 CDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs, 513 ProtoLocs, Context); 514 // Protocols in the class extension belong to the class. 515 if (CDecl->IsClassExtension()) 516 IDecl->mergeClassExtensionProtocolList((ObjCProtocolDecl**)ProtoRefs, 517 NumProtoRefs, Context); 518 } 519 520 CheckObjCDeclScope(CDecl); 521 return CDecl; 522} 523 524/// ActOnStartCategoryImplementation - Perform semantic checks on the 525/// category implementation declaration and build an ObjCCategoryImplDecl 526/// object. 527Decl *Sema::ActOnStartCategoryImplementation( 528 SourceLocation AtCatImplLoc, 529 IdentifierInfo *ClassName, SourceLocation ClassLoc, 530 IdentifierInfo *CatName, SourceLocation CatLoc) { 531 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true); 532 ObjCCategoryDecl *CatIDecl = 0; 533 if (IDecl) { 534 CatIDecl = IDecl->FindCategoryDeclaration(CatName); 535 if (!CatIDecl) { 536 // Category @implementation with no corresponding @interface. 537 // Create and install one. 538 CatIDecl = ObjCCategoryDecl::Create(Context, CurContext, SourceLocation(), 539 SourceLocation(), SourceLocation(), 540 CatName); 541 CatIDecl->setClassInterface(IDecl); 542 CatIDecl->insertNextClassCategory(); 543 } 544 } 545 546 ObjCCategoryImplDecl *CDecl = 547 ObjCCategoryImplDecl::Create(Context, CurContext, AtCatImplLoc, CatName, 548 IDecl); 549 /// Check that class of this category is already completely declared. 550 if (!IDecl || IDecl->isForwardDecl()) 551 Diag(ClassLoc, diag::err_undef_interface) << ClassName; 552 553 // FIXME: PushOnScopeChains? 554 CurContext->addDecl(CDecl); 555 556 /// Check that CatName, category name, is not used in another implementation. 557 if (CatIDecl) { 558 if (CatIDecl->getImplementation()) { 559 Diag(ClassLoc, diag::err_dup_implementation_category) << ClassName 560 << CatName; 561 Diag(CatIDecl->getImplementation()->getLocation(), 562 diag::note_previous_definition); 563 } else { 564 CatIDecl->setImplementation(CDecl); 565 // Warn on implementating category of deprecated class under 566 // -Wdeprecated-implementations flag. 567 DiagnoseObjCImplementedDeprecations(*this, 568 dyn_cast<NamedDecl>(IDecl), 569 CDecl->getLocation(), 2); 570 } 571 } 572 573 CheckObjCDeclScope(CDecl); 574 return CDecl; 575} 576 577Decl *Sema::ActOnStartClassImplementation( 578 SourceLocation AtClassImplLoc, 579 IdentifierInfo *ClassName, SourceLocation ClassLoc, 580 IdentifierInfo *SuperClassname, 581 SourceLocation SuperClassLoc) { 582 ObjCInterfaceDecl* IDecl = 0; 583 // Check for another declaration kind with the same name. 584 NamedDecl *PrevDecl 585 = LookupSingleName(TUScope, ClassName, ClassLoc, LookupOrdinaryName, 586 ForRedeclaration); 587 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 588 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName; 589 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 590 } else if ((IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl))) { 591 // If this is a forward declaration of an interface, warn. 592 if (IDecl->isForwardDecl()) { 593 Diag(ClassLoc, diag::warn_undef_interface) << ClassName; 594 IDecl = 0; 595 } 596 } else { 597 // We did not find anything with the name ClassName; try to correct for 598 // typos in the class name. 599 LookupResult R(*this, ClassName, ClassLoc, LookupOrdinaryName); 600 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 601 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 602 // Suggest the (potentially) correct interface name. However, put the 603 // fix-it hint itself in a separate note, since changing the name in 604 // the warning would make the fix-it change semantics.However, don't 605 // provide a code-modification hint or use the typo name for recovery, 606 // because this is just a warning. The program may actually be correct. 607 Diag(ClassLoc, diag::warn_undef_interface_suggest) 608 << ClassName << R.getLookupName(); 609 Diag(IDecl->getLocation(), diag::note_previous_decl) 610 << R.getLookupName() 611 << FixItHint::CreateReplacement(ClassLoc, 612 R.getLookupName().getAsString()); 613 IDecl = 0; 614 } else { 615 Diag(ClassLoc, diag::warn_undef_interface) << ClassName; 616 } 617 } 618 619 // Check that super class name is valid class name 620 ObjCInterfaceDecl* SDecl = 0; 621 if (SuperClassname) { 622 // Check if a different kind of symbol declared in this scope. 623 PrevDecl = LookupSingleName(TUScope, SuperClassname, SuperClassLoc, 624 LookupOrdinaryName); 625 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 626 Diag(SuperClassLoc, diag::err_redefinition_different_kind) 627 << SuperClassname; 628 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 629 } else { 630 SDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 631 if (!SDecl) 632 Diag(SuperClassLoc, diag::err_undef_superclass) 633 << SuperClassname << ClassName; 634 else if (IDecl && IDecl->getSuperClass() != SDecl) { 635 // This implementation and its interface do not have the same 636 // super class. 637 Diag(SuperClassLoc, diag::err_conflicting_super_class) 638 << SDecl->getDeclName(); 639 Diag(SDecl->getLocation(), diag::note_previous_definition); 640 } 641 } 642 } 643 644 if (!IDecl) { 645 // Legacy case of @implementation with no corresponding @interface. 646 // Build, chain & install the interface decl into the identifier. 647 648 // FIXME: Do we support attributes on the @implementation? If so we should 649 // copy them over. 650 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtClassImplLoc, 651 ClassName, ClassLoc, false, true); 652 IDecl->setSuperClass(SDecl); 653 IDecl->setLocEnd(ClassLoc); 654 655 PushOnScopeChains(IDecl, TUScope); 656 } else { 657 // Mark the interface as being completed, even if it was just as 658 // @class ....; 659 // declaration; the user cannot reopen it. 660 IDecl->setForwardDecl(false); 661 } 662 663 ObjCImplementationDecl* IMPDecl = 664 ObjCImplementationDecl::Create(Context, CurContext, AtClassImplLoc, 665 IDecl, SDecl); 666 667 if (CheckObjCDeclScope(IMPDecl)) 668 return IMPDecl; 669 670 // Check that there is no duplicate implementation of this class. 671 if (IDecl->getImplementation()) { 672 // FIXME: Don't leak everything! 673 Diag(ClassLoc, diag::err_dup_implementation_class) << ClassName; 674 Diag(IDecl->getImplementation()->getLocation(), 675 diag::note_previous_definition); 676 } else { // add it to the list. 677 IDecl->setImplementation(IMPDecl); 678 PushOnScopeChains(IMPDecl, TUScope); 679 // Warn on implementating deprecated class under 680 // -Wdeprecated-implementations flag. 681 DiagnoseObjCImplementedDeprecations(*this, 682 dyn_cast<NamedDecl>(IDecl), 683 IMPDecl->getLocation(), 1); 684 } 685 return IMPDecl; 686} 687 688void Sema::CheckImplementationIvars(ObjCImplementationDecl *ImpDecl, 689 ObjCIvarDecl **ivars, unsigned numIvars, 690 SourceLocation RBrace) { 691 assert(ImpDecl && "missing implementation decl"); 692 ObjCInterfaceDecl* IDecl = ImpDecl->getClassInterface(); 693 if (!IDecl) 694 return; 695 /// Check case of non-existing @interface decl. 696 /// (legacy objective-c @implementation decl without an @interface decl). 697 /// Add implementations's ivar to the synthesize class's ivar list. 698 if (IDecl->isImplicitInterfaceDecl()) { 699 IDecl->setLocEnd(RBrace); 700 // Add ivar's to class's DeclContext. 701 for (unsigned i = 0, e = numIvars; i != e; ++i) { 702 ivars[i]->setLexicalDeclContext(ImpDecl); 703 IDecl->makeDeclVisibleInContext(ivars[i], false); 704 ImpDecl->addDecl(ivars[i]); 705 } 706 707 return; 708 } 709 // If implementation has empty ivar list, just return. 710 if (numIvars == 0) 711 return; 712 713 assert(ivars && "missing @implementation ivars"); 714 if (LangOpts.ObjCNonFragileABI2) { 715 if (ImpDecl->getSuperClass()) 716 Diag(ImpDecl->getLocation(), diag::warn_on_superclass_use); 717 for (unsigned i = 0; i < numIvars; i++) { 718 ObjCIvarDecl* ImplIvar = ivars[i]; 719 if (const ObjCIvarDecl *ClsIvar = 720 IDecl->getIvarDecl(ImplIvar->getIdentifier())) { 721 Diag(ImplIvar->getLocation(), diag::err_duplicate_ivar_declaration); 722 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 723 continue; 724 } 725 // Instance ivar to Implementation's DeclContext. 726 ImplIvar->setLexicalDeclContext(ImpDecl); 727 IDecl->makeDeclVisibleInContext(ImplIvar, false); 728 ImpDecl->addDecl(ImplIvar); 729 } 730 return; 731 } 732 // Check interface's Ivar list against those in the implementation. 733 // names and types must match. 734 // 735 unsigned j = 0; 736 ObjCInterfaceDecl::ivar_iterator 737 IVI = IDecl->ivar_begin(), IVE = IDecl->ivar_end(); 738 for (; numIvars > 0 && IVI != IVE; ++IVI) { 739 ObjCIvarDecl* ImplIvar = ivars[j++]; 740 ObjCIvarDecl* ClsIvar = *IVI; 741 assert (ImplIvar && "missing implementation ivar"); 742 assert (ClsIvar && "missing class ivar"); 743 744 // First, make sure the types match. 745 if (Context.getCanonicalType(ImplIvar->getType()) != 746 Context.getCanonicalType(ClsIvar->getType())) { 747 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_type) 748 << ImplIvar->getIdentifier() 749 << ImplIvar->getType() << ClsIvar->getType(); 750 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 751 } else if (ImplIvar->isBitField() && ClsIvar->isBitField()) { 752 Expr *ImplBitWidth = ImplIvar->getBitWidth(); 753 Expr *ClsBitWidth = ClsIvar->getBitWidth(); 754 if (ImplBitWidth->EvaluateAsInt(Context).getZExtValue() != 755 ClsBitWidth->EvaluateAsInt(Context).getZExtValue()) { 756 Diag(ImplBitWidth->getLocStart(), diag::err_conflicting_ivar_bitwidth) 757 << ImplIvar->getIdentifier(); 758 Diag(ClsBitWidth->getLocStart(), diag::note_previous_definition); 759 } 760 } 761 // Make sure the names are identical. 762 if (ImplIvar->getIdentifier() != ClsIvar->getIdentifier()) { 763 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_name) 764 << ImplIvar->getIdentifier() << ClsIvar->getIdentifier(); 765 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 766 } 767 --numIvars; 768 } 769 770 if (numIvars > 0) 771 Diag(ivars[j]->getLocation(), diag::err_inconsistant_ivar_count); 772 else if (IVI != IVE) 773 Diag((*IVI)->getLocation(), diag::err_inconsistant_ivar_count); 774} 775 776void Sema::WarnUndefinedMethod(SourceLocation ImpLoc, ObjCMethodDecl *method, 777 bool &IncompleteImpl, unsigned DiagID) { 778 if (!IncompleteImpl) { 779 Diag(ImpLoc, diag::warn_incomplete_impl); 780 IncompleteImpl = true; 781 } 782 if (DiagID == diag::warn_unimplemented_protocol_method) 783 Diag(ImpLoc, DiagID) << method->getDeclName(); 784 else 785 Diag(method->getLocation(), DiagID) << method->getDeclName(); 786} 787 788/// Determines if type B can be substituted for type A. Returns true if we can 789/// guarantee that anything that the user will do to an object of type A can 790/// also be done to an object of type B. This is trivially true if the two 791/// types are the same, or if B is a subclass of A. It becomes more complex 792/// in cases where protocols are involved. 793/// 794/// Object types in Objective-C describe the minimum requirements for an 795/// object, rather than providing a complete description of a type. For 796/// example, if A is a subclass of B, then B* may refer to an instance of A. 797/// The principle of substitutability means that we may use an instance of A 798/// anywhere that we may use an instance of B - it will implement all of the 799/// ivars of B and all of the methods of B. 800/// 801/// This substitutability is important when type checking methods, because 802/// the implementation may have stricter type definitions than the interface. 803/// The interface specifies minimum requirements, but the implementation may 804/// have more accurate ones. For example, a method may privately accept 805/// instances of B, but only publish that it accepts instances of A. Any 806/// object passed to it will be type checked against B, and so will implicitly 807/// by a valid A*. Similarly, a method may return a subclass of the class that 808/// it is declared as returning. 809/// 810/// This is most important when considering subclassing. A method in a 811/// subclass must accept any object as an argument that its superclass's 812/// implementation accepts. It may, however, accept a more general type 813/// without breaking substitutability (i.e. you can still use the subclass 814/// anywhere that you can use the superclass, but not vice versa). The 815/// converse requirement applies to return types: the return type for a 816/// subclass method must be a valid object of the kind that the superclass 817/// advertises, but it may be specified more accurately. This avoids the need 818/// for explicit down-casting by callers. 819/// 820/// Note: This is a stricter requirement than for assignment. 821static bool isObjCTypeSubstitutable(ASTContext &Context, 822 const ObjCObjectPointerType *A, 823 const ObjCObjectPointerType *B, 824 bool rejectId) { 825 // Reject a protocol-unqualified id. 826 if (rejectId && B->isObjCIdType()) return false; 827 828 // If B is a qualified id, then A must also be a qualified id and it must 829 // implement all of the protocols in B. It may not be a qualified class. 830 // For example, MyClass<A> can be assigned to id<A>, but MyClass<A> is a 831 // stricter definition so it is not substitutable for id<A>. 832 if (B->isObjCQualifiedIdType()) { 833 return A->isObjCQualifiedIdType() && 834 Context.ObjCQualifiedIdTypesAreCompatible(QualType(A, 0), 835 QualType(B,0), 836 false); 837 } 838 839 /* 840 // id is a special type that bypasses type checking completely. We want a 841 // warning when it is used in one place but not another. 842 if (C.isObjCIdType(A) || C.isObjCIdType(B)) return false; 843 844 845 // If B is a qualified id, then A must also be a qualified id (which it isn't 846 // if we've got this far) 847 if (B->isObjCQualifiedIdType()) return false; 848 */ 849 850 // Now we know that A and B are (potentially-qualified) class types. The 851 // normal rules for assignment apply. 852 return Context.canAssignObjCInterfaces(A, B); 853} 854 855static SourceRange getTypeRange(TypeSourceInfo *TSI) { 856 return (TSI ? TSI->getTypeLoc().getSourceRange() : SourceRange()); 857} 858 859static void CheckMethodOverrideReturn(Sema &S, 860 ObjCMethodDecl *MethodImpl, 861 ObjCMethodDecl *MethodDecl, 862 bool IsProtocolMethodDecl) { 863 if (IsProtocolMethodDecl && 864 (MethodDecl->getObjCDeclQualifier() != 865 MethodImpl->getObjCDeclQualifier())) { 866 S.Diag(MethodImpl->getLocation(), 867 diag::warn_conflicting_ret_type_modifiers) 868 << MethodImpl->getDeclName() 869 << getTypeRange(MethodImpl->getResultTypeSourceInfo()); 870 S.Diag(MethodDecl->getLocation(), diag::note_previous_declaration) 871 << getTypeRange(MethodDecl->getResultTypeSourceInfo()); 872 } 873 874 if (S.Context.hasSameUnqualifiedType(MethodImpl->getResultType(), 875 MethodDecl->getResultType())) 876 return; 877 878 unsigned DiagID = diag::warn_conflicting_ret_types; 879 880 // Mismatches between ObjC pointers go into a different warning 881 // category, and sometimes they're even completely whitelisted. 882 if (const ObjCObjectPointerType *ImplPtrTy = 883 MethodImpl->getResultType()->getAs<ObjCObjectPointerType>()) { 884 if (const ObjCObjectPointerType *IfacePtrTy = 885 MethodDecl->getResultType()->getAs<ObjCObjectPointerType>()) { 886 // Allow non-matching return types as long as they don't violate 887 // the principle of substitutability. Specifically, we permit 888 // return types that are subclasses of the declared return type, 889 // or that are more-qualified versions of the declared type. 890 if (isObjCTypeSubstitutable(S.Context, IfacePtrTy, ImplPtrTy, false)) 891 return; 892 893 DiagID = diag::warn_non_covariant_ret_types; 894 } 895 } 896 897 S.Diag(MethodImpl->getLocation(), DiagID) 898 << MethodImpl->getDeclName() 899 << MethodDecl->getResultType() 900 << MethodImpl->getResultType() 901 << getTypeRange(MethodImpl->getResultTypeSourceInfo()); 902 S.Diag(MethodDecl->getLocation(), diag::note_previous_definition) 903 << getTypeRange(MethodDecl->getResultTypeSourceInfo()); 904} 905 906static void CheckMethodOverrideParam(Sema &S, 907 ObjCMethodDecl *MethodImpl, 908 ObjCMethodDecl *MethodDecl, 909 ParmVarDecl *ImplVar, 910 ParmVarDecl *IfaceVar, 911 bool IsProtocolMethodDecl) { 912 if (IsProtocolMethodDecl && 913 (ImplVar->getObjCDeclQualifier() != 914 IfaceVar->getObjCDeclQualifier())) { 915 S.Diag(ImplVar->getLocation(), 916 diag::warn_conflicting_param_modifiers) 917 << getTypeRange(ImplVar->getTypeSourceInfo()) 918 << MethodImpl->getDeclName(); 919 S.Diag(IfaceVar->getLocation(), diag::note_previous_declaration) 920 << getTypeRange(IfaceVar->getTypeSourceInfo()); 921 } 922 923 QualType ImplTy = ImplVar->getType(); 924 QualType IfaceTy = IfaceVar->getType(); 925 926 if (S.Context.hasSameUnqualifiedType(ImplTy, IfaceTy)) 927 return; 928 929 unsigned DiagID = diag::warn_conflicting_param_types; 930 931 // Mismatches between ObjC pointers go into a different warning 932 // category, and sometimes they're even completely whitelisted. 933 if (const ObjCObjectPointerType *ImplPtrTy = 934 ImplTy->getAs<ObjCObjectPointerType>()) { 935 if (const ObjCObjectPointerType *IfacePtrTy = 936 IfaceTy->getAs<ObjCObjectPointerType>()) { 937 // Allow non-matching argument types as long as they don't 938 // violate the principle of substitutability. Specifically, the 939 // implementation must accept any objects that the superclass 940 // accepts, however it may also accept others. 941 if (isObjCTypeSubstitutable(S.Context, ImplPtrTy, IfacePtrTy, true)) 942 return; 943 944 DiagID = diag::warn_non_contravariant_param_types; 945 } 946 } 947 948 S.Diag(ImplVar->getLocation(), DiagID) 949 << getTypeRange(ImplVar->getTypeSourceInfo()) 950 << MethodImpl->getDeclName() << IfaceTy << ImplTy; 951 S.Diag(IfaceVar->getLocation(), diag::note_previous_definition) 952 << getTypeRange(IfaceVar->getTypeSourceInfo()); 953} 954 955 956void Sema::WarnConflictingTypedMethods(ObjCMethodDecl *ImpMethodDecl, 957 ObjCMethodDecl *MethodDecl, 958 bool IsProtocolMethodDecl) { 959 CheckMethodOverrideReturn(*this, ImpMethodDecl, MethodDecl, 960 IsProtocolMethodDecl); 961 962 for (ObjCMethodDecl::param_iterator IM = ImpMethodDecl->param_begin(), 963 IF = MethodDecl->param_begin(), EM = ImpMethodDecl->param_end(); 964 IM != EM; ++IM, ++IF) 965 CheckMethodOverrideParam(*this, ImpMethodDecl, MethodDecl, *IM, *IF, 966 IsProtocolMethodDecl); 967 968 if (ImpMethodDecl->isVariadic() != MethodDecl->isVariadic()) { 969 Diag(ImpMethodDecl->getLocation(), diag::warn_conflicting_variadic); 970 Diag(MethodDecl->getLocation(), diag::note_previous_declaration); 971 } 972} 973 974/// FIXME: Type hierarchies in Objective-C can be deep. We could most likely 975/// improve the efficiency of selector lookups and type checking by associating 976/// with each protocol / interface / category the flattened instance tables. If 977/// we used an immutable set to keep the table then it wouldn't add significant 978/// memory cost and it would be handy for lookups. 979 980/// CheckProtocolMethodDefs - This routine checks unimplemented methods 981/// Declared in protocol, and those referenced by it. 982void Sema::CheckProtocolMethodDefs(SourceLocation ImpLoc, 983 ObjCProtocolDecl *PDecl, 984 bool& IncompleteImpl, 985 const llvm::DenseSet<Selector> &InsMap, 986 const llvm::DenseSet<Selector> &ClsMap, 987 ObjCContainerDecl *CDecl) { 988 ObjCInterfaceDecl *IDecl; 989 if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl)) 990 IDecl = C->getClassInterface(); 991 else 992 IDecl = dyn_cast<ObjCInterfaceDecl>(CDecl); 993 assert (IDecl && "CheckProtocolMethodDefs - IDecl is null"); 994 995 ObjCInterfaceDecl *Super = IDecl->getSuperClass(); 996 ObjCInterfaceDecl *NSIDecl = 0; 997 if (getLangOptions().NeXTRuntime) { 998 // check to see if class implements forwardInvocation method and objects 999 // of this class are derived from 'NSProxy' so that to forward requests 1000 // from one object to another. 1001 // Under such conditions, which means that every method possible is 1002 // implemented in the class, we should not issue "Method definition not 1003 // found" warnings. 1004 // FIXME: Use a general GetUnarySelector method for this. 1005 IdentifierInfo* II = &Context.Idents.get("forwardInvocation"); 1006 Selector fISelector = Context.Selectors.getSelector(1, &II); 1007 if (InsMap.count(fISelector)) 1008 // Is IDecl derived from 'NSProxy'? If so, no instance methods 1009 // need be implemented in the implementation. 1010 NSIDecl = IDecl->lookupInheritedClass(&Context.Idents.get("NSProxy")); 1011 } 1012 1013 // If a method lookup fails locally we still need to look and see if 1014 // the method was implemented by a base class or an inherited 1015 // protocol. This lookup is slow, but occurs rarely in correct code 1016 // and otherwise would terminate in a warning. 1017 1018 // check unimplemented instance methods. 1019 if (!NSIDecl) 1020 for (ObjCProtocolDecl::instmeth_iterator I = PDecl->instmeth_begin(), 1021 E = PDecl->instmeth_end(); I != E; ++I) { 1022 ObjCMethodDecl *method = *I; 1023 if (method->getImplementationControl() != ObjCMethodDecl::Optional && 1024 !method->isSynthesized() && !InsMap.count(method->getSelector()) && 1025 (!Super || 1026 !Super->lookupInstanceMethod(method->getSelector()))) { 1027 // Ugly, but necessary. Method declared in protcol might have 1028 // have been synthesized due to a property declared in the class which 1029 // uses the protocol. 1030 ObjCMethodDecl *MethodInClass = 1031 IDecl->lookupInstanceMethod(method->getSelector()); 1032 if (!MethodInClass || !MethodInClass->isSynthesized()) { 1033 unsigned DIAG = diag::warn_unimplemented_protocol_method; 1034 if (Diags.getDiagnosticLevel(DIAG, ImpLoc) 1035 != Diagnostic::Ignored) { 1036 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG); 1037 Diag(method->getLocation(), diag::note_method_declared_at); 1038 Diag(CDecl->getLocation(), diag::note_required_for_protocol_at) 1039 << PDecl->getDeclName(); 1040 } 1041 } 1042 } 1043 } 1044 // check unimplemented class methods 1045 for (ObjCProtocolDecl::classmeth_iterator 1046 I = PDecl->classmeth_begin(), E = PDecl->classmeth_end(); 1047 I != E; ++I) { 1048 ObjCMethodDecl *method = *I; 1049 if (method->getImplementationControl() != ObjCMethodDecl::Optional && 1050 !ClsMap.count(method->getSelector()) && 1051 (!Super || !Super->lookupClassMethod(method->getSelector()))) { 1052 unsigned DIAG = diag::warn_unimplemented_protocol_method; 1053 if (Diags.getDiagnosticLevel(DIAG, ImpLoc) != Diagnostic::Ignored) { 1054 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG); 1055 Diag(method->getLocation(), diag::note_method_declared_at); 1056 Diag(IDecl->getLocation(), diag::note_required_for_protocol_at) << 1057 PDecl->getDeclName(); 1058 } 1059 } 1060 } 1061 // Check on this protocols's referenced protocols, recursively. 1062 for (ObjCProtocolDecl::protocol_iterator PI = PDecl->protocol_begin(), 1063 E = PDecl->protocol_end(); PI != E; ++PI) 1064 CheckProtocolMethodDefs(ImpLoc, *PI, IncompleteImpl, InsMap, ClsMap, IDecl); 1065} 1066 1067/// MatchAllMethodDeclarations - Check methods declaraed in interface or 1068/// or protocol against those declared in their implementations. 1069/// 1070void Sema::MatchAllMethodDeclarations(const llvm::DenseSet<Selector> &InsMap, 1071 const llvm::DenseSet<Selector> &ClsMap, 1072 llvm::DenseSet<Selector> &InsMapSeen, 1073 llvm::DenseSet<Selector> &ClsMapSeen, 1074 ObjCImplDecl* IMPDecl, 1075 ObjCContainerDecl* CDecl, 1076 bool &IncompleteImpl, 1077 bool ImmediateClass) { 1078 // Check and see if instance methods in class interface have been 1079 // implemented in the implementation class. If so, their types match. 1080 for (ObjCInterfaceDecl::instmeth_iterator I = CDecl->instmeth_begin(), 1081 E = CDecl->instmeth_end(); I != E; ++I) { 1082 if (InsMapSeen.count((*I)->getSelector())) 1083 continue; 1084 InsMapSeen.insert((*I)->getSelector()); 1085 if (!(*I)->isSynthesized() && 1086 !InsMap.count((*I)->getSelector())) { 1087 if (ImmediateClass) 1088 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl, 1089 diag::note_undef_method_impl); 1090 continue; 1091 } else { 1092 ObjCMethodDecl *ImpMethodDecl = 1093 IMPDecl->getInstanceMethod((*I)->getSelector()); 1094 ObjCMethodDecl *MethodDecl = 1095 CDecl->getInstanceMethod((*I)->getSelector()); 1096 assert(MethodDecl && 1097 "MethodDecl is null in ImplMethodsVsClassMethods"); 1098 // ImpMethodDecl may be null as in a @dynamic property. 1099 if (ImpMethodDecl) 1100 WarnConflictingTypedMethods(ImpMethodDecl, MethodDecl, 1101 isa<ObjCProtocolDecl>(CDecl)); 1102 } 1103 } 1104 1105 // Check and see if class methods in class interface have been 1106 // implemented in the implementation class. If so, their types match. 1107 for (ObjCInterfaceDecl::classmeth_iterator 1108 I = CDecl->classmeth_begin(), E = CDecl->classmeth_end(); I != E; ++I) { 1109 if (ClsMapSeen.count((*I)->getSelector())) 1110 continue; 1111 ClsMapSeen.insert((*I)->getSelector()); 1112 if (!ClsMap.count((*I)->getSelector())) { 1113 if (ImmediateClass) 1114 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl, 1115 diag::note_undef_method_impl); 1116 } else { 1117 ObjCMethodDecl *ImpMethodDecl = 1118 IMPDecl->getClassMethod((*I)->getSelector()); 1119 ObjCMethodDecl *MethodDecl = 1120 CDecl->getClassMethod((*I)->getSelector()); 1121 WarnConflictingTypedMethods(ImpMethodDecl, MethodDecl, 1122 isa<ObjCProtocolDecl>(CDecl)); 1123 } 1124 } 1125 1126 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) { 1127 // Also methods in class extensions need be looked at next. 1128 for (const ObjCCategoryDecl *ClsExtDecl = I->getFirstClassExtension(); 1129 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) 1130 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1131 IMPDecl, 1132 const_cast<ObjCCategoryDecl *>(ClsExtDecl), 1133 IncompleteImpl, false); 1134 1135 // Check for any implementation of a methods declared in protocol. 1136 for (ObjCInterfaceDecl::all_protocol_iterator 1137 PI = I->all_referenced_protocol_begin(), 1138 E = I->all_referenced_protocol_end(); PI != E; ++PI) 1139 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1140 IMPDecl, 1141 (*PI), IncompleteImpl, false); 1142 if (I->getSuperClass()) 1143 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1144 IMPDecl, 1145 I->getSuperClass(), IncompleteImpl, false); 1146 } 1147} 1148 1149void Sema::ImplMethodsVsClassMethods(Scope *S, ObjCImplDecl* IMPDecl, 1150 ObjCContainerDecl* CDecl, 1151 bool IncompleteImpl) { 1152 llvm::DenseSet<Selector> InsMap; 1153 // Check and see if instance methods in class interface have been 1154 // implemented in the implementation class. 1155 for (ObjCImplementationDecl::instmeth_iterator 1156 I = IMPDecl->instmeth_begin(), E = IMPDecl->instmeth_end(); I!=E; ++I) 1157 InsMap.insert((*I)->getSelector()); 1158 1159 // Check and see if properties declared in the interface have either 1) 1160 // an implementation or 2) there is a @synthesize/@dynamic implementation 1161 // of the property in the @implementation. 1162 if (isa<ObjCInterfaceDecl>(CDecl) && 1163 !(LangOpts.ObjCDefaultSynthProperties && LangOpts.ObjCNonFragileABI2)) 1164 DiagnoseUnimplementedProperties(S, IMPDecl, CDecl, InsMap); 1165 1166 llvm::DenseSet<Selector> ClsMap; 1167 for (ObjCImplementationDecl::classmeth_iterator 1168 I = IMPDecl->classmeth_begin(), 1169 E = IMPDecl->classmeth_end(); I != E; ++I) 1170 ClsMap.insert((*I)->getSelector()); 1171 1172 // Check for type conflict of methods declared in a class/protocol and 1173 // its implementation; if any. 1174 llvm::DenseSet<Selector> InsMapSeen, ClsMapSeen; 1175 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1176 IMPDecl, CDecl, 1177 IncompleteImpl, true); 1178 1179 // Check the protocol list for unimplemented methods in the @implementation 1180 // class. 1181 // Check and see if class methods in class interface have been 1182 // implemented in the implementation class. 1183 1184 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) { 1185 for (ObjCInterfaceDecl::all_protocol_iterator 1186 PI = I->all_referenced_protocol_begin(), 1187 E = I->all_referenced_protocol_end(); PI != E; ++PI) 1188 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl, 1189 InsMap, ClsMap, I); 1190 // Check class extensions (unnamed categories) 1191 for (const ObjCCategoryDecl *Categories = I->getFirstClassExtension(); 1192 Categories; Categories = Categories->getNextClassExtension()) 1193 ImplMethodsVsClassMethods(S, IMPDecl, 1194 const_cast<ObjCCategoryDecl*>(Categories), 1195 IncompleteImpl); 1196 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl)) { 1197 // For extended class, unimplemented methods in its protocols will 1198 // be reported in the primary class. 1199 if (!C->IsClassExtension()) { 1200 for (ObjCCategoryDecl::protocol_iterator PI = C->protocol_begin(), 1201 E = C->protocol_end(); PI != E; ++PI) 1202 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl, 1203 InsMap, ClsMap, CDecl); 1204 // Report unimplemented properties in the category as well. 1205 // When reporting on missing setter/getters, do not report when 1206 // setter/getter is implemented in category's primary class 1207 // implementation. 1208 if (ObjCInterfaceDecl *ID = C->getClassInterface()) 1209 if (ObjCImplDecl *IMP = ID->getImplementation()) { 1210 for (ObjCImplementationDecl::instmeth_iterator 1211 I = IMP->instmeth_begin(), E = IMP->instmeth_end(); I!=E; ++I) 1212 InsMap.insert((*I)->getSelector()); 1213 } 1214 DiagnoseUnimplementedProperties(S, IMPDecl, CDecl, InsMap); 1215 } 1216 } else 1217 assert(false && "invalid ObjCContainerDecl type."); 1218} 1219 1220/// ActOnForwardClassDeclaration - 1221Decl * 1222Sema::ActOnForwardClassDeclaration(SourceLocation AtClassLoc, 1223 IdentifierInfo **IdentList, 1224 SourceLocation *IdentLocs, 1225 unsigned NumElts) { 1226 llvm::SmallVector<ObjCInterfaceDecl*, 32> Interfaces; 1227 1228 for (unsigned i = 0; i != NumElts; ++i) { 1229 // Check for another declaration kind with the same name. 1230 NamedDecl *PrevDecl 1231 = LookupSingleName(TUScope, IdentList[i], IdentLocs[i], 1232 LookupOrdinaryName, ForRedeclaration); 1233 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1234 // Maybe we will complain about the shadowed template parameter. 1235 DiagnoseTemplateParameterShadow(AtClassLoc, PrevDecl); 1236 // Just pretend that we didn't see the previous declaration. 1237 PrevDecl = 0; 1238 } 1239 1240 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 1241 // GCC apparently allows the following idiom: 1242 // 1243 // typedef NSObject < XCElementTogglerP > XCElementToggler; 1244 // @class XCElementToggler; 1245 // 1246 // FIXME: Make an extension? 1247 TypedefNameDecl *TDD = dyn_cast<TypedefNameDecl>(PrevDecl); 1248 if (!TDD || !TDD->getUnderlyingType()->isObjCObjectType()) { 1249 Diag(AtClassLoc, diag::err_redefinition_different_kind) << IdentList[i]; 1250 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1251 } else { 1252 // a forward class declaration matching a typedef name of a class refers 1253 // to the underlying class. 1254 if (const ObjCObjectType *OI = 1255 TDD->getUnderlyingType()->getAs<ObjCObjectType>()) 1256 PrevDecl = OI->getInterface(); 1257 } 1258 } 1259 ObjCInterfaceDecl *IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 1260 if (!IDecl) { // Not already seen? Make a forward decl. 1261 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtClassLoc, 1262 IdentList[i], IdentLocs[i], true); 1263 1264 // Push the ObjCInterfaceDecl on the scope chain but do *not* add it to 1265 // the current DeclContext. This prevents clients that walk DeclContext 1266 // from seeing the imaginary ObjCInterfaceDecl until it is actually 1267 // declared later (if at all). We also take care to explicitly make 1268 // sure this declaration is visible for name lookup. 1269 PushOnScopeChains(IDecl, TUScope, false); 1270 CurContext->makeDeclVisibleInContext(IDecl, true); 1271 } 1272 1273 Interfaces.push_back(IDecl); 1274 } 1275 1276 assert(Interfaces.size() == NumElts); 1277 ObjCClassDecl *CDecl = ObjCClassDecl::Create(Context, CurContext, AtClassLoc, 1278 Interfaces.data(), IdentLocs, 1279 Interfaces.size()); 1280 CurContext->addDecl(CDecl); 1281 CheckObjCDeclScope(CDecl); 1282 return CDecl; 1283} 1284 1285 1286/// MatchTwoMethodDeclarations - Checks that two methods have matching type and 1287/// returns true, or false, accordingly. 1288/// TODO: Handle protocol list; such as id<p1,p2> in type comparisons 1289bool Sema::MatchTwoMethodDeclarations(const ObjCMethodDecl *Method, 1290 const ObjCMethodDecl *PrevMethod, 1291 bool matchBasedOnSizeAndAlignment, 1292 bool matchBasedOnStrictEqulity) { 1293 QualType T1 = Context.getCanonicalType(Method->getResultType()); 1294 QualType T2 = Context.getCanonicalType(PrevMethod->getResultType()); 1295 1296 if (T1 != T2) { 1297 // The result types are different. 1298 if (!matchBasedOnSizeAndAlignment || matchBasedOnStrictEqulity) 1299 return false; 1300 // Incomplete types don't have a size and alignment. 1301 if (T1->isIncompleteType() || T2->isIncompleteType()) 1302 return false; 1303 // Check is based on size and alignment. 1304 if (Context.getTypeInfo(T1) != Context.getTypeInfo(T2)) 1305 return false; 1306 } 1307 1308 ObjCMethodDecl::param_iterator ParamI = Method->param_begin(), 1309 E = Method->param_end(); 1310 ObjCMethodDecl::param_iterator PrevI = PrevMethod->param_begin(); 1311 1312 for (; ParamI != E; ++ParamI, ++PrevI) { 1313 assert(PrevI != PrevMethod->param_end() && "Param mismatch"); 1314 T1 = Context.getCanonicalType((*ParamI)->getType()); 1315 T2 = Context.getCanonicalType((*PrevI)->getType()); 1316 if (T1 != T2) { 1317 // The result types are different. 1318 if (!matchBasedOnSizeAndAlignment || matchBasedOnStrictEqulity) 1319 return false; 1320 // Incomplete types don't have a size and alignment. 1321 if (T1->isIncompleteType() || T2->isIncompleteType()) 1322 return false; 1323 // Check is based on size and alignment. 1324 if (Context.getTypeInfo(T1) != Context.getTypeInfo(T2)) 1325 return false; 1326 } 1327 } 1328 return true; 1329} 1330 1331/// \brief Read the contents of the method pool for a given selector from 1332/// external storage. 1333/// 1334/// This routine should only be called once, when the method pool has no entry 1335/// for this selector. 1336Sema::GlobalMethodPool::iterator Sema::ReadMethodPool(Selector Sel) { 1337 assert(ExternalSource && "We need an external AST source"); 1338 assert(MethodPool.find(Sel) == MethodPool.end() && 1339 "Selector data already loaded into the method pool"); 1340 1341 // Read the method list from the external source. 1342 GlobalMethods Methods = ExternalSource->ReadMethodPool(Sel); 1343 1344 return MethodPool.insert(std::make_pair(Sel, Methods)).first; 1345} 1346 1347void Sema::AddMethodToGlobalPool(ObjCMethodDecl *Method, bool impl, 1348 bool instance) { 1349 GlobalMethodPool::iterator Pos = MethodPool.find(Method->getSelector()); 1350 if (Pos == MethodPool.end()) { 1351 if (ExternalSource) 1352 Pos = ReadMethodPool(Method->getSelector()); 1353 else 1354 Pos = MethodPool.insert(std::make_pair(Method->getSelector(), 1355 GlobalMethods())).first; 1356 } 1357 Method->setDefined(impl); 1358 ObjCMethodList &Entry = instance ? Pos->second.first : Pos->second.second; 1359 if (Entry.Method == 0) { 1360 // Haven't seen a method with this selector name yet - add it. 1361 Entry.Method = Method; 1362 Entry.Next = 0; 1363 return; 1364 } 1365 1366 // We've seen a method with this name, see if we have already seen this type 1367 // signature. 1368 for (ObjCMethodList *List = &Entry; List; List = List->Next) 1369 if (MatchTwoMethodDeclarations(Method, List->Method)) { 1370 ObjCMethodDecl *PrevObjCMethod = List->Method; 1371 PrevObjCMethod->setDefined(impl); 1372 // If a method is deprecated, push it in the global pool. 1373 // This is used for better diagnostics. 1374 if (Method->isDeprecated()) { 1375 if (!PrevObjCMethod->isDeprecated()) 1376 List->Method = Method; 1377 } 1378 // If new method is unavailable, push it into global pool 1379 // unless previous one is deprecated. 1380 if (Method->isUnavailable()) { 1381 if (PrevObjCMethod->getAvailability() < AR_Deprecated) 1382 List->Method = Method; 1383 } 1384 return; 1385 } 1386 1387 // We have a new signature for an existing method - add it. 1388 // This is extremely rare. Only 1% of Cocoa selectors are "overloaded". 1389 ObjCMethodList *Mem = BumpAlloc.Allocate<ObjCMethodList>(); 1390 Entry.Next = new (Mem) ObjCMethodList(Method, Entry.Next); 1391} 1392 1393ObjCMethodDecl *Sema::LookupMethodInGlobalPool(Selector Sel, SourceRange R, 1394 bool receiverIdOrClass, 1395 bool warn, bool instance) { 1396 GlobalMethodPool::iterator Pos = MethodPool.find(Sel); 1397 if (Pos == MethodPool.end()) { 1398 if (ExternalSource) 1399 Pos = ReadMethodPool(Sel); 1400 else 1401 return 0; 1402 } 1403 1404 ObjCMethodList &MethList = instance ? Pos->second.first : Pos->second.second; 1405 1406 bool strictSelectorMatch = receiverIdOrClass && warn && 1407 (Diags.getDiagnosticLevel(diag::warn_strict_multiple_method_decl, 1408 R.getBegin()) != 1409 Diagnostic::Ignored); 1410 if (warn && MethList.Method && MethList.Next) { 1411 bool issueWarning = false; 1412 if (strictSelectorMatch) 1413 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) { 1414 // This checks if the methods differ in type mismatch. 1415 if (!MatchTwoMethodDeclarations(MethList.Method, Next->Method, false, true)) 1416 issueWarning = true; 1417 } 1418 1419 if (!issueWarning) 1420 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) { 1421 // This checks if the methods differ by size & alignment. 1422 if (!MatchTwoMethodDeclarations(MethList.Method, Next->Method, true)) 1423 issueWarning = true; 1424 } 1425 1426 if (issueWarning) { 1427 if (strictSelectorMatch) 1428 Diag(R.getBegin(), diag::warn_strict_multiple_method_decl) << Sel << R; 1429 else 1430 Diag(R.getBegin(), diag::warn_multiple_method_decl) << Sel << R; 1431 Diag(MethList.Method->getLocStart(), diag::note_using) 1432 << MethList.Method->getSourceRange(); 1433 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) 1434 Diag(Next->Method->getLocStart(), diag::note_also_found) 1435 << Next->Method->getSourceRange(); 1436 } 1437 } 1438 return MethList.Method; 1439} 1440 1441ObjCMethodDecl *Sema::LookupImplementedMethodInGlobalPool(Selector Sel) { 1442 GlobalMethodPool::iterator Pos = MethodPool.find(Sel); 1443 if (Pos == MethodPool.end()) 1444 return 0; 1445 1446 GlobalMethods &Methods = Pos->second; 1447 1448 if (Methods.first.Method && Methods.first.Method->isDefined()) 1449 return Methods.first.Method; 1450 if (Methods.second.Method && Methods.second.Method->isDefined()) 1451 return Methods.second.Method; 1452 return 0; 1453} 1454 1455/// CompareMethodParamsInBaseAndSuper - This routine compares methods with 1456/// identical selector names in current and its super classes and issues 1457/// a warning if any of their argument types are incompatible. 1458void Sema::CompareMethodParamsInBaseAndSuper(Decl *ClassDecl, 1459 ObjCMethodDecl *Method, 1460 bool IsInstance) { 1461 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(ClassDecl); 1462 if (ID == 0) return; 1463 1464 while (ObjCInterfaceDecl *SD = ID->getSuperClass()) { 1465 ObjCMethodDecl *SuperMethodDecl = 1466 SD->lookupMethod(Method->getSelector(), IsInstance); 1467 if (SuperMethodDecl == 0) { 1468 ID = SD; 1469 continue; 1470 } 1471 ObjCMethodDecl::param_iterator ParamI = Method->param_begin(), 1472 E = Method->param_end(); 1473 ObjCMethodDecl::param_iterator PrevI = SuperMethodDecl->param_begin(); 1474 for (; ParamI != E; ++ParamI, ++PrevI) { 1475 // Number of parameters are the same and is guaranteed by selector match. 1476 assert(PrevI != SuperMethodDecl->param_end() && "Param mismatch"); 1477 QualType T1 = Context.getCanonicalType((*ParamI)->getType()); 1478 QualType T2 = Context.getCanonicalType((*PrevI)->getType()); 1479 // If type of argument of method in this class does not match its 1480 // respective argument type in the super class method, issue warning; 1481 if (!Context.typesAreCompatible(T1, T2)) { 1482 Diag((*ParamI)->getLocation(), diag::ext_typecheck_base_super) 1483 << T1 << T2; 1484 Diag(SuperMethodDecl->getLocation(), diag::note_previous_declaration); 1485 return; 1486 } 1487 } 1488 ID = SD; 1489 } 1490} 1491 1492/// DiagnoseDuplicateIvars - 1493/// Check for duplicate ivars in the entire class at the start of 1494/// @implementation. This becomes necesssary because class extension can 1495/// add ivars to a class in random order which will not be known until 1496/// class's @implementation is seen. 1497void Sema::DiagnoseDuplicateIvars(ObjCInterfaceDecl *ID, 1498 ObjCInterfaceDecl *SID) { 1499 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 1500 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 1501 ObjCIvarDecl* Ivar = (*IVI); 1502 if (Ivar->isInvalidDecl()) 1503 continue; 1504 if (IdentifierInfo *II = Ivar->getIdentifier()) { 1505 ObjCIvarDecl* prevIvar = SID->lookupInstanceVariable(II); 1506 if (prevIvar) { 1507 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 1508 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 1509 Ivar->setInvalidDecl(); 1510 } 1511 } 1512 } 1513} 1514 1515// Note: For class/category implemenations, allMethods/allProperties is 1516// always null. 1517void Sema::ActOnAtEnd(Scope *S, SourceRange AtEnd, 1518 Decl *ClassDecl, 1519 Decl **allMethods, unsigned allNum, 1520 Decl **allProperties, unsigned pNum, 1521 DeclGroupPtrTy *allTUVars, unsigned tuvNum) { 1522 // FIXME: If we don't have a ClassDecl, we have an error. We should consider 1523 // always passing in a decl. If the decl has an error, isInvalidDecl() 1524 // should be true. 1525 if (!ClassDecl) 1526 return; 1527 1528 bool isInterfaceDeclKind = 1529 isa<ObjCInterfaceDecl>(ClassDecl) || isa<ObjCCategoryDecl>(ClassDecl) 1530 || isa<ObjCProtocolDecl>(ClassDecl); 1531 bool checkIdenticalMethods = isa<ObjCImplementationDecl>(ClassDecl); 1532 1533 if (!isInterfaceDeclKind && AtEnd.isInvalid()) { 1534 // FIXME: This is wrong. We shouldn't be pretending that there is 1535 // an '@end' in the declaration. 1536 SourceLocation L = ClassDecl->getLocation(); 1537 AtEnd.setBegin(L); 1538 AtEnd.setEnd(L); 1539 Diag(L, diag::err_missing_atend); 1540 } 1541 1542 // FIXME: Remove these and use the ObjCContainerDecl/DeclContext. 1543 llvm::DenseMap<Selector, const ObjCMethodDecl*> InsMap; 1544 llvm::DenseMap<Selector, const ObjCMethodDecl*> ClsMap; 1545 1546 for (unsigned i = 0; i < allNum; i++ ) { 1547 ObjCMethodDecl *Method = 1548 cast_or_null<ObjCMethodDecl>(allMethods[i]); 1549 1550 if (!Method) continue; // Already issued a diagnostic. 1551 if (Method->isInstanceMethod()) { 1552 /// Check for instance method of the same name with incompatible types 1553 const ObjCMethodDecl *&PrevMethod = InsMap[Method->getSelector()]; 1554 bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod) 1555 : false; 1556 if ((isInterfaceDeclKind && PrevMethod && !match) 1557 || (checkIdenticalMethods && match)) { 1558 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 1559 << Method->getDeclName(); 1560 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 1561 Method->setInvalidDecl(); 1562 } else { 1563 InsMap[Method->getSelector()] = Method; 1564 /// The following allows us to typecheck messages to "id". 1565 AddInstanceMethodToGlobalPool(Method); 1566 // verify that the instance method conforms to the same definition of 1567 // parent methods if it shadows one. 1568 CompareMethodParamsInBaseAndSuper(ClassDecl, Method, true); 1569 } 1570 } else { 1571 /// Check for class method of the same name with incompatible types 1572 const ObjCMethodDecl *&PrevMethod = ClsMap[Method->getSelector()]; 1573 bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod) 1574 : false; 1575 if ((isInterfaceDeclKind && PrevMethod && !match) 1576 || (checkIdenticalMethods && match)) { 1577 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 1578 << Method->getDeclName(); 1579 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 1580 Method->setInvalidDecl(); 1581 } else { 1582 ClsMap[Method->getSelector()] = Method; 1583 /// The following allows us to typecheck messages to "Class". 1584 AddFactoryMethodToGlobalPool(Method); 1585 // verify that the class method conforms to the same definition of 1586 // parent methods if it shadows one. 1587 CompareMethodParamsInBaseAndSuper(ClassDecl, Method, false); 1588 } 1589 } 1590 } 1591 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl>(ClassDecl)) { 1592 // Compares properties declared in this class to those of its 1593 // super class. 1594 ComparePropertiesInBaseAndSuper(I); 1595 CompareProperties(I, I); 1596 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(ClassDecl)) { 1597 // Categories are used to extend the class by declaring new methods. 1598 // By the same token, they are also used to add new properties. No 1599 // need to compare the added property to those in the class. 1600 1601 // Compare protocol properties with those in category 1602 CompareProperties(C, C); 1603 if (C->IsClassExtension()) { 1604 ObjCInterfaceDecl *CCPrimary = C->getClassInterface(); 1605 DiagnoseClassExtensionDupMethods(C, CCPrimary); 1606 } 1607 } 1608 if (ObjCContainerDecl *CDecl = dyn_cast<ObjCContainerDecl>(ClassDecl)) { 1609 if (CDecl->getIdentifier()) 1610 // ProcessPropertyDecl is responsible for diagnosing conflicts with any 1611 // user-defined setter/getter. It also synthesizes setter/getter methods 1612 // and adds them to the DeclContext and global method pools. 1613 for (ObjCContainerDecl::prop_iterator I = CDecl->prop_begin(), 1614 E = CDecl->prop_end(); 1615 I != E; ++I) 1616 ProcessPropertyDecl(*I, CDecl); 1617 CDecl->setAtEndRange(AtEnd); 1618 } 1619 if (ObjCImplementationDecl *IC=dyn_cast<ObjCImplementationDecl>(ClassDecl)) { 1620 IC->setAtEndRange(AtEnd); 1621 if (ObjCInterfaceDecl* IDecl = IC->getClassInterface()) { 1622 // Any property declared in a class extension might have user 1623 // declared setter or getter in current class extension or one 1624 // of the other class extensions. Mark them as synthesized as 1625 // property will be synthesized when property with same name is 1626 // seen in the @implementation. 1627 for (const ObjCCategoryDecl *ClsExtDecl = 1628 IDecl->getFirstClassExtension(); 1629 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 1630 for (ObjCContainerDecl::prop_iterator I = ClsExtDecl->prop_begin(), 1631 E = ClsExtDecl->prop_end(); I != E; ++I) { 1632 ObjCPropertyDecl *Property = (*I); 1633 // Skip over properties declared @dynamic 1634 if (const ObjCPropertyImplDecl *PIDecl 1635 = IC->FindPropertyImplDecl(Property->getIdentifier())) 1636 if (PIDecl->getPropertyImplementation() 1637 == ObjCPropertyImplDecl::Dynamic) 1638 continue; 1639 1640 for (const ObjCCategoryDecl *CExtDecl = 1641 IDecl->getFirstClassExtension(); 1642 CExtDecl; CExtDecl = CExtDecl->getNextClassExtension()) { 1643 if (ObjCMethodDecl *GetterMethod = 1644 CExtDecl->getInstanceMethod(Property->getGetterName())) 1645 GetterMethod->setSynthesized(true); 1646 if (!Property->isReadOnly()) 1647 if (ObjCMethodDecl *SetterMethod = 1648 CExtDecl->getInstanceMethod(Property->getSetterName())) 1649 SetterMethod->setSynthesized(true); 1650 } 1651 } 1652 } 1653 1654 if (LangOpts.ObjCDefaultSynthProperties && 1655 LangOpts.ObjCNonFragileABI2) 1656 DefaultSynthesizeProperties(S, IC, IDecl); 1657 ImplMethodsVsClassMethods(S, IC, IDecl); 1658 AtomicPropertySetterGetterRules(IC, IDecl); 1659 1660 if (LangOpts.ObjCNonFragileABI2) 1661 while (IDecl->getSuperClass()) { 1662 DiagnoseDuplicateIvars(IDecl, IDecl->getSuperClass()); 1663 IDecl = IDecl->getSuperClass(); 1664 } 1665 } 1666 SetIvarInitializers(IC); 1667 } else if (ObjCCategoryImplDecl* CatImplClass = 1668 dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) { 1669 CatImplClass->setAtEndRange(AtEnd); 1670 1671 // Find category interface decl and then check that all methods declared 1672 // in this interface are implemented in the category @implementation. 1673 if (ObjCInterfaceDecl* IDecl = CatImplClass->getClassInterface()) { 1674 for (ObjCCategoryDecl *Categories = IDecl->getCategoryList(); 1675 Categories; Categories = Categories->getNextClassCategory()) { 1676 if (Categories->getIdentifier() == CatImplClass->getIdentifier()) { 1677 ImplMethodsVsClassMethods(S, CatImplClass, Categories); 1678 break; 1679 } 1680 } 1681 } 1682 } 1683 if (isInterfaceDeclKind) { 1684 // Reject invalid vardecls. 1685 for (unsigned i = 0; i != tuvNum; i++) { 1686 DeclGroupRef DG = allTUVars[i].getAsVal<DeclGroupRef>(); 1687 for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I) 1688 if (VarDecl *VDecl = dyn_cast<VarDecl>(*I)) { 1689 if (!VDecl->hasExternalStorage()) 1690 Diag(VDecl->getLocation(), diag::err_objc_var_decl_inclass); 1691 } 1692 } 1693 } 1694} 1695 1696 1697/// CvtQTToAstBitMask - utility routine to produce an AST bitmask for 1698/// objective-c's type qualifier from the parser version of the same info. 1699static Decl::ObjCDeclQualifier 1700CvtQTToAstBitMask(ObjCDeclSpec::ObjCDeclQualifier PQTVal) { 1701 return (Decl::ObjCDeclQualifier) (unsigned) PQTVal; 1702} 1703 1704static inline 1705bool containsInvalidMethodImplAttribute(const AttrVec &A) { 1706 // The 'ibaction' attribute is allowed on method definitions because of 1707 // how the IBAction macro is used on both method declarations and definitions. 1708 // If the method definitions contains any other attributes, return true. 1709 for (AttrVec::const_iterator i = A.begin(), e = A.end(); i != e; ++i) 1710 if ((*i)->getKind() != attr::IBAction) 1711 return true; 1712 return false; 1713} 1714 1715Decl *Sema::ActOnMethodDeclaration( 1716 Scope *S, 1717 SourceLocation MethodLoc, SourceLocation EndLoc, 1718 tok::TokenKind MethodType, Decl *ClassDecl, 1719 ObjCDeclSpec &ReturnQT, ParsedType ReturnType, 1720 Selector Sel, 1721 // optional arguments. The number of types/arguments is obtained 1722 // from the Sel.getNumArgs(). 1723 ObjCArgInfo *ArgInfo, 1724 DeclaratorChunk::ParamInfo *CParamInfo, unsigned CNumArgs, // c-style args 1725 AttributeList *AttrList, tok::ObjCKeywordKind MethodDeclKind, 1726 bool isVariadic, bool MethodDefinition) { 1727 // Make sure we can establish a context for the method. 1728 if (!ClassDecl) { 1729 Diag(MethodLoc, diag::error_missing_method_context); 1730 return 0; 1731 } 1732 QualType resultDeclType; 1733 1734 TypeSourceInfo *ResultTInfo = 0; 1735 if (ReturnType) { 1736 resultDeclType = GetTypeFromParser(ReturnType, &ResultTInfo); 1737 1738 // Methods cannot return interface types. All ObjC objects are 1739 // passed by reference. 1740 if (resultDeclType->isObjCObjectType()) { 1741 Diag(MethodLoc, diag::err_object_cannot_be_passed_returned_by_value) 1742 << 0 << resultDeclType; 1743 return 0; 1744 } 1745 } else // get the type for "id". 1746 resultDeclType = Context.getObjCIdType(); 1747 1748 ObjCMethodDecl* ObjCMethod = 1749 ObjCMethodDecl::Create(Context, MethodLoc, EndLoc, Sel, resultDeclType, 1750 ResultTInfo, 1751 cast<DeclContext>(ClassDecl), 1752 MethodType == tok::minus, isVariadic, 1753 false, false, 1754 MethodDeclKind == tok::objc_optional ? 1755 ObjCMethodDecl::Optional : 1756 ObjCMethodDecl::Required); 1757 1758 llvm::SmallVector<ParmVarDecl*, 16> Params; 1759 1760 for (unsigned i = 0, e = Sel.getNumArgs(); i != e; ++i) { 1761 QualType ArgType; 1762 TypeSourceInfo *DI; 1763 1764 if (ArgInfo[i].Type == 0) { 1765 ArgType = Context.getObjCIdType(); 1766 DI = 0; 1767 } else { 1768 ArgType = GetTypeFromParser(ArgInfo[i].Type, &DI); 1769 // Perform the default array/function conversions (C99 6.7.5.3p[7,8]). 1770 ArgType = adjustParameterType(ArgType); 1771 } 1772 1773 LookupResult R(*this, ArgInfo[i].Name, ArgInfo[i].NameLoc, 1774 LookupOrdinaryName, ForRedeclaration); 1775 LookupName(R, S); 1776 if (R.isSingleResult()) { 1777 NamedDecl *PrevDecl = R.getFoundDecl(); 1778 if (S->isDeclScope(PrevDecl)) { 1779 Diag(ArgInfo[i].NameLoc, 1780 (MethodDefinition ? diag::warn_method_param_redefinition 1781 : diag::warn_method_param_declaration)) 1782 << ArgInfo[i].Name; 1783 Diag(PrevDecl->getLocation(), 1784 diag::note_previous_declaration); 1785 } 1786 } 1787 1788 SourceLocation StartLoc = DI 1789 ? DI->getTypeLoc().getBeginLoc() 1790 : ArgInfo[i].NameLoc; 1791 1792 ParmVarDecl* Param = CheckParameter(ObjCMethod, StartLoc, 1793 ArgInfo[i].NameLoc, ArgInfo[i].Name, 1794 ArgType, DI, SC_None, SC_None); 1795 1796 Param->setObjCMethodScopeInfo(i); 1797 1798 Param->setObjCDeclQualifier( 1799 CvtQTToAstBitMask(ArgInfo[i].DeclSpec.getObjCDeclQualifier())); 1800 1801 // Apply the attributes to the parameter. 1802 ProcessDeclAttributeList(TUScope, Param, ArgInfo[i].ArgAttrs); 1803 1804 S->AddDecl(Param); 1805 IdResolver.AddDecl(Param); 1806 1807 Params.push_back(Param); 1808 } 1809 1810 for (unsigned i = 0, e = CNumArgs; i != e; ++i) { 1811 ParmVarDecl *Param = cast<ParmVarDecl>(CParamInfo[i].Param); 1812 QualType ArgType = Param->getType(); 1813 if (ArgType.isNull()) 1814 ArgType = Context.getObjCIdType(); 1815 else 1816 // Perform the default array/function conversions (C99 6.7.5.3p[7,8]). 1817 ArgType = adjustParameterType(ArgType); 1818 if (ArgType->isObjCObjectType()) { 1819 Diag(Param->getLocation(), 1820 diag::err_object_cannot_be_passed_returned_by_value) 1821 << 1 << ArgType; 1822 Param->setInvalidDecl(); 1823 } 1824 Param->setDeclContext(ObjCMethod); 1825 1826 Params.push_back(Param); 1827 } 1828 1829 ObjCMethod->setMethodParams(Context, Params.data(), Params.size(), 1830 Sel.getNumArgs()); 1831 ObjCMethod->setObjCDeclQualifier( 1832 CvtQTToAstBitMask(ReturnQT.getObjCDeclQualifier())); 1833 const ObjCMethodDecl *PrevMethod = 0; 1834 1835 if (AttrList) 1836 ProcessDeclAttributeList(TUScope, ObjCMethod, AttrList); 1837 1838 const ObjCMethodDecl *InterfaceMD = 0; 1839 1840 // Add the method now. 1841 if (ObjCImplementationDecl *ImpDecl = 1842 dyn_cast<ObjCImplementationDecl>(ClassDecl)) { 1843 if (MethodType == tok::minus) { 1844 PrevMethod = ImpDecl->getInstanceMethod(Sel); 1845 ImpDecl->addInstanceMethod(ObjCMethod); 1846 } else { 1847 PrevMethod = ImpDecl->getClassMethod(Sel); 1848 ImpDecl->addClassMethod(ObjCMethod); 1849 } 1850 InterfaceMD = ImpDecl->getClassInterface()->getMethod(Sel, 1851 MethodType == tok::minus); 1852 if (ObjCMethod->hasAttrs() && 1853 containsInvalidMethodImplAttribute(ObjCMethod->getAttrs())) 1854 Diag(EndLoc, diag::warn_attribute_method_def); 1855 } else if (ObjCCategoryImplDecl *CatImpDecl = 1856 dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) { 1857 if (MethodType == tok::minus) { 1858 PrevMethod = CatImpDecl->getInstanceMethod(Sel); 1859 CatImpDecl->addInstanceMethod(ObjCMethod); 1860 } else { 1861 PrevMethod = CatImpDecl->getClassMethod(Sel); 1862 CatImpDecl->addClassMethod(ObjCMethod); 1863 } 1864 if (ObjCMethod->hasAttrs() && 1865 containsInvalidMethodImplAttribute(ObjCMethod->getAttrs())) 1866 Diag(EndLoc, diag::warn_attribute_method_def); 1867 } else { 1868 cast<DeclContext>(ClassDecl)->addDecl(ObjCMethod); 1869 } 1870 if (PrevMethod) { 1871 // You can never have two method definitions with the same name. 1872 Diag(ObjCMethod->getLocation(), diag::err_duplicate_method_decl) 1873 << ObjCMethod->getDeclName(); 1874 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 1875 } 1876 1877 // Merge information down from the interface declaration if we have one. 1878 if (InterfaceMD) 1879 mergeObjCMethodDecls(ObjCMethod, InterfaceMD); 1880 1881 return ObjCMethod; 1882} 1883 1884bool Sema::CheckObjCDeclScope(Decl *D) { 1885 if (isa<TranslationUnitDecl>(CurContext->getRedeclContext())) 1886 return false; 1887 1888 Diag(D->getLocation(), diag::err_objc_decls_may_only_appear_in_global_scope); 1889 D->setInvalidDecl(); 1890 1891 return true; 1892} 1893 1894/// Called whenever @defs(ClassName) is encountered in the source. Inserts the 1895/// instance variables of ClassName into Decls. 1896void Sema::ActOnDefs(Scope *S, Decl *TagD, SourceLocation DeclStart, 1897 IdentifierInfo *ClassName, 1898 llvm::SmallVectorImpl<Decl*> &Decls) { 1899 // Check that ClassName is a valid class 1900 ObjCInterfaceDecl *Class = getObjCInterfaceDecl(ClassName, DeclStart); 1901 if (!Class) { 1902 Diag(DeclStart, diag::err_undef_interface) << ClassName; 1903 return; 1904 } 1905 if (LangOpts.ObjCNonFragileABI) { 1906 Diag(DeclStart, diag::err_atdef_nonfragile_interface); 1907 return; 1908 } 1909 1910 // Collect the instance variables 1911 llvm::SmallVector<ObjCIvarDecl*, 32> Ivars; 1912 Context.DeepCollectObjCIvars(Class, true, Ivars); 1913 // For each ivar, create a fresh ObjCAtDefsFieldDecl. 1914 for (unsigned i = 0; i < Ivars.size(); i++) { 1915 FieldDecl* ID = cast<FieldDecl>(Ivars[i]); 1916 RecordDecl *Record = dyn_cast<RecordDecl>(TagD); 1917 Decl *FD = ObjCAtDefsFieldDecl::Create(Context, Record, 1918 /*FIXME: StartL=*/ID->getLocation(), 1919 ID->getLocation(), 1920 ID->getIdentifier(), ID->getType(), 1921 ID->getBitWidth()); 1922 Decls.push_back(FD); 1923 } 1924 1925 // Introduce all of these fields into the appropriate scope. 1926 for (llvm::SmallVectorImpl<Decl*>::iterator D = Decls.begin(); 1927 D != Decls.end(); ++D) { 1928 FieldDecl *FD = cast<FieldDecl>(*D); 1929 if (getLangOptions().CPlusPlus) 1930 PushOnScopeChains(cast<FieldDecl>(FD), S); 1931 else if (RecordDecl *Record = dyn_cast<RecordDecl>(TagD)) 1932 Record->addDecl(FD); 1933 } 1934} 1935 1936/// \brief Build a type-check a new Objective-C exception variable declaration. 1937VarDecl *Sema::BuildObjCExceptionDecl(TypeSourceInfo *TInfo, QualType T, 1938 SourceLocation StartLoc, 1939 SourceLocation IdLoc, 1940 IdentifierInfo *Id, 1941 bool Invalid) { 1942 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 1943 // duration shall not be qualified by an address-space qualifier." 1944 // Since all parameters have automatic store duration, they can not have 1945 // an address space. 1946 if (T.getAddressSpace() != 0) { 1947 Diag(IdLoc, diag::err_arg_with_address_space); 1948 Invalid = true; 1949 } 1950 1951 // An @catch parameter must be an unqualified object pointer type; 1952 // FIXME: Recover from "NSObject foo" by inserting the * in "NSObject *foo"? 1953 if (Invalid) { 1954 // Don't do any further checking. 1955 } else if (T->isDependentType()) { 1956 // Okay: we don't know what this type will instantiate to. 1957 } else if (!T->isObjCObjectPointerType()) { 1958 Invalid = true; 1959 Diag(IdLoc ,diag::err_catch_param_not_objc_type); 1960 } else if (T->isObjCQualifiedIdType()) { 1961 Invalid = true; 1962 Diag(IdLoc, diag::err_illegal_qualifiers_on_catch_parm); 1963 } 1964 1965 VarDecl *New = VarDecl::Create(Context, CurContext, StartLoc, IdLoc, Id, 1966 T, TInfo, SC_None, SC_None); 1967 New->setExceptionVariable(true); 1968 1969 if (Invalid) 1970 New->setInvalidDecl(); 1971 return New; 1972} 1973 1974Decl *Sema::ActOnObjCExceptionDecl(Scope *S, Declarator &D) { 1975 const DeclSpec &DS = D.getDeclSpec(); 1976 1977 // We allow the "register" storage class on exception variables because 1978 // GCC did, but we drop it completely. Any other storage class is an error. 1979 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 1980 Diag(DS.getStorageClassSpecLoc(), diag::warn_register_objc_catch_parm) 1981 << FixItHint::CreateRemoval(SourceRange(DS.getStorageClassSpecLoc())); 1982 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 1983 Diag(DS.getStorageClassSpecLoc(), diag::err_storage_spec_on_catch_parm) 1984 << DS.getStorageClassSpec(); 1985 } 1986 if (D.getDeclSpec().isThreadSpecified()) 1987 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 1988 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1989 1990 DiagnoseFunctionSpecifiers(D); 1991 1992 // Check that there are no default arguments inside the type of this 1993 // exception object (C++ only). 1994 if (getLangOptions().CPlusPlus) 1995 CheckExtraCXXDefaultArguments(D); 1996 1997 TagDecl *OwnedDecl = 0; 1998 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 1999 QualType ExceptionType = TInfo->getType(); 2000 2001 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 2002 // Objective-C++: Types shall not be defined in exception types. 2003 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 2004 << Context.getTypeDeclType(OwnedDecl); 2005 } 2006 2007 VarDecl *New = BuildObjCExceptionDecl(TInfo, ExceptionType, 2008 D.getSourceRange().getBegin(), 2009 D.getIdentifierLoc(), 2010 D.getIdentifier(), 2011 D.isInvalidType()); 2012 2013 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 2014 if (D.getCXXScopeSpec().isSet()) { 2015 Diag(D.getIdentifierLoc(), diag::err_qualified_objc_catch_parm) 2016 << D.getCXXScopeSpec().getRange(); 2017 New->setInvalidDecl(); 2018 } 2019 2020 // Add the parameter declaration into this scope. 2021 S->AddDecl(New); 2022 if (D.getIdentifier()) 2023 IdResolver.AddDecl(New); 2024 2025 ProcessDeclAttributes(S, New, D); 2026 2027 if (New->hasAttr<BlocksAttr>()) 2028 Diag(New->getLocation(), diag::err_block_on_nonlocal); 2029 return New; 2030} 2031 2032/// CollectIvarsToConstructOrDestruct - Collect those ivars which require 2033/// initialization. 2034void Sema::CollectIvarsToConstructOrDestruct(ObjCInterfaceDecl *OI, 2035 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 2036 for (ObjCIvarDecl *Iv = OI->all_declared_ivar_begin(); Iv; 2037 Iv= Iv->getNextIvar()) { 2038 QualType QT = Context.getBaseElementType(Iv->getType()); 2039 if (QT->isRecordType()) 2040 Ivars.push_back(Iv); 2041 } 2042} 2043 2044void ObjCImplementationDecl::setIvarInitializers(ASTContext &C, 2045 CXXCtorInitializer ** initializers, 2046 unsigned numInitializers) { 2047 if (numInitializers > 0) { 2048 NumIvarInitializers = numInitializers; 2049 CXXCtorInitializer **ivarInitializers = 2050 new (C) CXXCtorInitializer*[NumIvarInitializers]; 2051 memcpy(ivarInitializers, initializers, 2052 numInitializers * sizeof(CXXCtorInitializer*)); 2053 IvarInitializers = ivarInitializers; 2054 } 2055} 2056 2057void Sema::DiagnoseUseOfUnimplementedSelectors() { 2058 // Warning will be issued only when selector table is 2059 // generated (which means there is at lease one implementation 2060 // in the TU). This is to match gcc's behavior. 2061 if (ReferencedSelectors.empty() || 2062 !Context.AnyObjCImplementation()) 2063 return; 2064 for (llvm::DenseMap<Selector, SourceLocation>::iterator S = 2065 ReferencedSelectors.begin(), 2066 E = ReferencedSelectors.end(); S != E; ++S) { 2067 Selector Sel = (*S).first; 2068 if (!LookupImplementedMethodInGlobalPool(Sel)) 2069 Diag((*S).second, diag::warn_unimplemented_selector) << Sel; 2070 } 2071 return; 2072} 2073