SemaDeclObjC.cpp revision 206125
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 "Sema.h" 15#include "Lookup.h" 16#include "clang/Sema/ExternalSemaSource.h" 17#include "clang/AST/Expr.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/DeclObjC.h" 20#include "clang/Parse/DeclSpec.h" 21using namespace clang; 22 23/// ActOnStartOfObjCMethodDef - This routine sets up parameters; invisible 24/// and user declared, in the method definition's AST. 25void Sema::ActOnStartOfObjCMethodDef(Scope *FnBodyScope, DeclPtrTy D) { 26 assert(getCurMethodDecl() == 0 && "Method parsing confused"); 27 ObjCMethodDecl *MDecl = dyn_cast_or_null<ObjCMethodDecl>(D.getAs<Decl>()); 28 29 // If we don't have a valid method decl, simply return. 30 if (!MDecl) 31 return; 32 33 // Allow the rest of sema to find private method decl implementations. 34 if (MDecl->isInstanceMethod()) 35 AddInstanceMethodToGlobalPool(MDecl); 36 else 37 AddFactoryMethodToGlobalPool(MDecl); 38 39 // Allow all of Sema to see that we are entering a method definition. 40 PushDeclContext(FnBodyScope, MDecl); 41 PushFunctionScope(); 42 43 // Create Decl objects for each parameter, entrring them in the scope for 44 // binding to their use. 45 46 // Insert the invisible arguments, self and _cmd! 47 MDecl->createImplicitParams(Context, MDecl->getClassInterface()); 48 49 PushOnScopeChains(MDecl->getSelfDecl(), FnBodyScope); 50 PushOnScopeChains(MDecl->getCmdDecl(), FnBodyScope); 51 52 // Introduce all of the other parameters into this scope. 53 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(), 54 E = MDecl->param_end(); PI != E; ++PI) 55 if ((*PI)->getIdentifier()) 56 PushOnScopeChains(*PI, FnBodyScope); 57} 58 59Sema::DeclPtrTy Sema:: 60ActOnStartClassInterface(SourceLocation AtInterfaceLoc, 61 IdentifierInfo *ClassName, SourceLocation ClassLoc, 62 IdentifierInfo *SuperName, SourceLocation SuperLoc, 63 const DeclPtrTy *ProtoRefs, unsigned NumProtoRefs, 64 const SourceLocation *ProtoLocs, 65 SourceLocation EndProtoLoc, AttributeList *AttrList) { 66 assert(ClassName && "Missing class identifier"); 67 68 // Check for another declaration kind with the same name. 69 NamedDecl *PrevDecl = LookupSingleName(TUScope, ClassName, LookupOrdinaryName); 70 if (PrevDecl && PrevDecl->isTemplateParameter()) { 71 // Maybe we will complain about the shadowed template parameter. 72 DiagnoseTemplateParameterShadow(ClassLoc, PrevDecl); 73 // Just pretend that we didn't see the previous declaration. 74 PrevDecl = 0; 75 } 76 77 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 78 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName; 79 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 80 } 81 82 ObjCInterfaceDecl* IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 83 if (IDecl) { 84 // Class already seen. Is it a forward declaration? 85 if (!IDecl->isForwardDecl()) { 86 IDecl->setInvalidDecl(); 87 Diag(AtInterfaceLoc, diag::err_duplicate_class_def)<<IDecl->getDeclName(); 88 Diag(IDecl->getLocation(), diag::note_previous_definition); 89 90 // Return the previous class interface. 91 // FIXME: don't leak the objects passed in! 92 return DeclPtrTy::make(IDecl); 93 } else { 94 IDecl->setLocation(AtInterfaceLoc); 95 IDecl->setForwardDecl(false); 96 IDecl->setClassLoc(ClassLoc); 97 98 // Since this ObjCInterfaceDecl was created by a forward declaration, 99 // we now add it to the DeclContext since it wasn't added before 100 // (see ActOnForwardClassDeclaration). 101 CurContext->addDecl(IDecl); 102 103 if (AttrList) 104 ProcessDeclAttributeList(TUScope, IDecl, AttrList); 105 } 106 } else { 107 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtInterfaceLoc, 108 ClassName, ClassLoc); 109 if (AttrList) 110 ProcessDeclAttributeList(TUScope, IDecl, AttrList); 111 112 PushOnScopeChains(IDecl, TUScope); 113 } 114 115 if (SuperName) { 116 // Check if a different kind of symbol declared in this scope. 117 PrevDecl = LookupSingleName(TUScope, SuperName, LookupOrdinaryName); 118 119 if (!PrevDecl) { 120 // Try to correct for a typo in the superclass name. 121 LookupResult R(*this, SuperName, SuperLoc, LookupOrdinaryName); 122 if (CorrectTypo(R, TUScope, 0) && 123 (PrevDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 124 Diag(SuperLoc, diag::err_undef_superclass_suggest) 125 << SuperName << ClassName << PrevDecl->getDeclName(); 126 Diag(PrevDecl->getLocation(), diag::note_previous_decl) 127 << PrevDecl->getDeclName(); 128 } 129 } 130 131 if (PrevDecl == IDecl) { 132 Diag(SuperLoc, diag::err_recursive_superclass) 133 << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc); 134 IDecl->setLocEnd(ClassLoc); 135 } else { 136 ObjCInterfaceDecl *SuperClassDecl = 137 dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 138 139 // Diagnose classes that inherit from deprecated classes. 140 if (SuperClassDecl) 141 (void)DiagnoseUseOfDecl(SuperClassDecl, SuperLoc); 142 143 if (PrevDecl && SuperClassDecl == 0) { 144 // The previous declaration was not a class decl. Check if we have a 145 // typedef. If we do, get the underlying class type. 146 if (const TypedefDecl *TDecl = dyn_cast_or_null<TypedefDecl>(PrevDecl)) { 147 QualType T = TDecl->getUnderlyingType(); 148 if (T->isObjCInterfaceType()) { 149 if (NamedDecl *IDecl = T->getAs<ObjCInterfaceType>()->getDecl()) 150 SuperClassDecl = dyn_cast<ObjCInterfaceDecl>(IDecl); 151 } 152 } 153 154 // This handles the following case: 155 // 156 // typedef int SuperClass; 157 // @interface MyClass : SuperClass {} @end 158 // 159 if (!SuperClassDecl) { 160 Diag(SuperLoc, diag::err_redefinition_different_kind) << SuperName; 161 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 162 } 163 } 164 165 if (!dyn_cast_or_null<TypedefDecl>(PrevDecl)) { 166 if (!SuperClassDecl) 167 Diag(SuperLoc, diag::err_undef_superclass) 168 << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc); 169 else if (SuperClassDecl->isForwardDecl()) 170 Diag(SuperLoc, diag::err_undef_superclass) 171 << SuperClassDecl->getDeclName() << ClassName 172 << SourceRange(AtInterfaceLoc, ClassLoc); 173 } 174 IDecl->setSuperClass(SuperClassDecl); 175 IDecl->setSuperClassLoc(SuperLoc); 176 IDecl->setLocEnd(SuperLoc); 177 } 178 } else { // we have a root class. 179 IDecl->setLocEnd(ClassLoc); 180 } 181 182 /// Check then save referenced protocols. 183 if (NumProtoRefs) { 184 IDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs, 185 ProtoLocs, Context); 186 IDecl->setLocEnd(EndProtoLoc); 187 } 188 189 CheckObjCDeclScope(IDecl); 190 return DeclPtrTy::make(IDecl); 191} 192 193/// ActOnCompatiblityAlias - this action is called after complete parsing of 194/// @compatibility_alias declaration. It sets up the alias relationships. 195Sema::DeclPtrTy Sema::ActOnCompatiblityAlias(SourceLocation AtLoc, 196 IdentifierInfo *AliasName, 197 SourceLocation AliasLocation, 198 IdentifierInfo *ClassName, 199 SourceLocation ClassLocation) { 200 // Look for previous declaration of alias name 201 NamedDecl *ADecl = LookupSingleName(TUScope, AliasName, LookupOrdinaryName); 202 if (ADecl) { 203 if (isa<ObjCCompatibleAliasDecl>(ADecl)) 204 Diag(AliasLocation, diag::warn_previous_alias_decl); 205 else 206 Diag(AliasLocation, diag::err_conflicting_aliasing_type) << AliasName; 207 Diag(ADecl->getLocation(), diag::note_previous_declaration); 208 return DeclPtrTy(); 209 } 210 // Check for class declaration 211 NamedDecl *CDeclU = LookupSingleName(TUScope, ClassName, LookupOrdinaryName); 212 if (const TypedefDecl *TDecl = dyn_cast_or_null<TypedefDecl>(CDeclU)) { 213 QualType T = TDecl->getUnderlyingType(); 214 if (T->isObjCInterfaceType()) { 215 if (NamedDecl *IDecl = T->getAs<ObjCInterfaceType>()->getDecl()) { 216 ClassName = IDecl->getIdentifier(); 217 CDeclU = LookupSingleName(TUScope, ClassName, LookupOrdinaryName); 218 } 219 } 220 } 221 ObjCInterfaceDecl *CDecl = dyn_cast_or_null<ObjCInterfaceDecl>(CDeclU); 222 if (CDecl == 0) { 223 Diag(ClassLocation, diag::warn_undef_interface) << ClassName; 224 if (CDeclU) 225 Diag(CDeclU->getLocation(), diag::note_previous_declaration); 226 return DeclPtrTy(); 227 } 228 229 // Everything checked out, instantiate a new alias declaration AST. 230 ObjCCompatibleAliasDecl *AliasDecl = 231 ObjCCompatibleAliasDecl::Create(Context, CurContext, AtLoc, AliasName, CDecl); 232 233 if (!CheckObjCDeclScope(AliasDecl)) 234 PushOnScopeChains(AliasDecl, TUScope); 235 236 return DeclPtrTy::make(AliasDecl); 237} 238 239void Sema::CheckForwardProtocolDeclarationForCircularDependency( 240 IdentifierInfo *PName, 241 SourceLocation &Ploc, SourceLocation PrevLoc, 242 const ObjCList<ObjCProtocolDecl> &PList) { 243 for (ObjCList<ObjCProtocolDecl>::iterator I = PList.begin(), 244 E = PList.end(); I != E; ++I) { 245 246 if (ObjCProtocolDecl *PDecl = LookupProtocol((*I)->getIdentifier())) { 247 if (PDecl->getIdentifier() == PName) { 248 Diag(Ploc, diag::err_protocol_has_circular_dependency); 249 Diag(PrevLoc, diag::note_previous_definition); 250 } 251 CheckForwardProtocolDeclarationForCircularDependency(PName, Ploc, 252 PDecl->getLocation(), PDecl->getReferencedProtocols()); 253 } 254 } 255} 256 257Sema::DeclPtrTy 258Sema::ActOnStartProtocolInterface(SourceLocation AtProtoInterfaceLoc, 259 IdentifierInfo *ProtocolName, 260 SourceLocation ProtocolLoc, 261 const DeclPtrTy *ProtoRefs, 262 unsigned NumProtoRefs, 263 const SourceLocation *ProtoLocs, 264 SourceLocation EndProtoLoc, 265 AttributeList *AttrList) { 266 // FIXME: Deal with AttrList. 267 assert(ProtocolName && "Missing protocol identifier"); 268 ObjCProtocolDecl *PDecl = LookupProtocol(ProtocolName); 269 if (PDecl) { 270 // Protocol already seen. Better be a forward protocol declaration 271 if (!PDecl->isForwardDecl()) { 272 Diag(ProtocolLoc, diag::warn_duplicate_protocol_def) << ProtocolName; 273 Diag(PDecl->getLocation(), diag::note_previous_definition); 274 // Just return the protocol we already had. 275 // FIXME: don't leak the objects passed in! 276 return DeclPtrTy::make(PDecl); 277 } 278 ObjCList<ObjCProtocolDecl> PList; 279 PList.set((ObjCProtocolDecl *const*)ProtoRefs, NumProtoRefs, Context); 280 CheckForwardProtocolDeclarationForCircularDependency( 281 ProtocolName, ProtocolLoc, PDecl->getLocation(), PList); 282 PList.Destroy(Context); 283 284 // Make sure the cached decl gets a valid start location. 285 PDecl->setLocation(AtProtoInterfaceLoc); 286 PDecl->setForwardDecl(false); 287 } else { 288 PDecl = ObjCProtocolDecl::Create(Context, CurContext, 289 AtProtoInterfaceLoc,ProtocolName); 290 PushOnScopeChains(PDecl, TUScope); 291 PDecl->setForwardDecl(false); 292 } 293 if (AttrList) 294 ProcessDeclAttributeList(TUScope, PDecl, AttrList); 295 if (NumProtoRefs) { 296 /// Check then save referenced protocols. 297 PDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs, 298 ProtoLocs, Context); 299 PDecl->setLocEnd(EndProtoLoc); 300 } 301 302 CheckObjCDeclScope(PDecl); 303 return DeclPtrTy::make(PDecl); 304} 305 306/// FindProtocolDeclaration - This routine looks up protocols and 307/// issues an error if they are not declared. It returns list of 308/// protocol declarations in its 'Protocols' argument. 309void 310Sema::FindProtocolDeclaration(bool WarnOnDeclarations, 311 const IdentifierLocPair *ProtocolId, 312 unsigned NumProtocols, 313 llvm::SmallVectorImpl<DeclPtrTy> &Protocols) { 314 for (unsigned i = 0; i != NumProtocols; ++i) { 315 ObjCProtocolDecl *PDecl = LookupProtocol(ProtocolId[i].first); 316 if (!PDecl) { 317 LookupResult R(*this, ProtocolId[i].first, ProtocolId[i].second, 318 LookupObjCProtocolName); 319 if (CorrectTypo(R, TUScope, 0) && 320 (PDecl = R.getAsSingle<ObjCProtocolDecl>())) { 321 Diag(ProtocolId[i].second, diag::err_undeclared_protocol_suggest) 322 << ProtocolId[i].first << R.getLookupName(); 323 Diag(PDecl->getLocation(), diag::note_previous_decl) 324 << PDecl->getDeclName(); 325 } 326 } 327 328 if (!PDecl) { 329 Diag(ProtocolId[i].second, diag::err_undeclared_protocol) 330 << ProtocolId[i].first; 331 continue; 332 } 333 334 (void)DiagnoseUseOfDecl(PDecl, ProtocolId[i].second); 335 336 // If this is a forward declaration and we are supposed to warn in this 337 // case, do it. 338 if (WarnOnDeclarations && PDecl->isForwardDecl()) 339 Diag(ProtocolId[i].second, diag::warn_undef_protocolref) 340 << ProtocolId[i].first; 341 Protocols.push_back(DeclPtrTy::make(PDecl)); 342 } 343} 344 345/// DiagnoseClassExtensionDupMethods - Check for duplicate declaration of 346/// a class method in its extension. 347/// 348void Sema::DiagnoseClassExtensionDupMethods(ObjCCategoryDecl *CAT, 349 ObjCInterfaceDecl *ID) { 350 if (!ID) 351 return; // Possibly due to previous error 352 353 llvm::DenseMap<Selector, const ObjCMethodDecl*> MethodMap; 354 for (ObjCInterfaceDecl::method_iterator i = ID->meth_begin(), 355 e = ID->meth_end(); i != e; ++i) { 356 ObjCMethodDecl *MD = *i; 357 MethodMap[MD->getSelector()] = MD; 358 } 359 360 if (MethodMap.empty()) 361 return; 362 for (ObjCCategoryDecl::method_iterator i = CAT->meth_begin(), 363 e = CAT->meth_end(); i != e; ++i) { 364 ObjCMethodDecl *Method = *i; 365 const ObjCMethodDecl *&PrevMethod = MethodMap[Method->getSelector()]; 366 if (PrevMethod && !MatchTwoMethodDeclarations(Method, PrevMethod)) { 367 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 368 << Method->getDeclName(); 369 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 370 } 371 } 372} 373 374/// ActOnForwardProtocolDeclaration - Handle @protocol foo; 375Action::DeclPtrTy 376Sema::ActOnForwardProtocolDeclaration(SourceLocation AtProtocolLoc, 377 const IdentifierLocPair *IdentList, 378 unsigned NumElts, 379 AttributeList *attrList) { 380 llvm::SmallVector<ObjCProtocolDecl*, 32> Protocols; 381 llvm::SmallVector<SourceLocation, 8> ProtoLocs; 382 383 for (unsigned i = 0; i != NumElts; ++i) { 384 IdentifierInfo *Ident = IdentList[i].first; 385 ObjCProtocolDecl *PDecl = LookupProtocol(Ident); 386 if (PDecl == 0) { // Not already seen? 387 PDecl = ObjCProtocolDecl::Create(Context, CurContext, 388 IdentList[i].second, Ident); 389 PushOnScopeChains(PDecl, TUScope); 390 } 391 if (attrList) 392 ProcessDeclAttributeList(TUScope, PDecl, attrList); 393 Protocols.push_back(PDecl); 394 ProtoLocs.push_back(IdentList[i].second); 395 } 396 397 ObjCForwardProtocolDecl *PDecl = 398 ObjCForwardProtocolDecl::Create(Context, CurContext, AtProtocolLoc, 399 Protocols.data(), Protocols.size(), 400 ProtoLocs.data()); 401 CurContext->addDecl(PDecl); 402 CheckObjCDeclScope(PDecl); 403 return DeclPtrTy::make(PDecl); 404} 405 406Sema::DeclPtrTy Sema:: 407ActOnStartCategoryInterface(SourceLocation AtInterfaceLoc, 408 IdentifierInfo *ClassName, SourceLocation ClassLoc, 409 IdentifierInfo *CategoryName, 410 SourceLocation CategoryLoc, 411 const DeclPtrTy *ProtoRefs, 412 unsigned NumProtoRefs, 413 const SourceLocation *ProtoLocs, 414 SourceLocation EndProtoLoc) { 415 ObjCCategoryDecl *CDecl = 0; 416 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc); 417 418 /// Check that class of this category is already completely declared. 419 if (!IDecl || IDecl->isForwardDecl()) { 420 // Create an invalid ObjCCategoryDecl to serve as context for 421 // the enclosing method declarations. We mark the decl invalid 422 // to make it clear that this isn't a valid AST. 423 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc, 424 ClassLoc, CategoryLoc, CategoryName); 425 CDecl->setInvalidDecl(); 426 Diag(ClassLoc, diag::err_undef_interface) << ClassName; 427 return DeclPtrTy::make(CDecl); 428 } 429 430 if (!CategoryName) { 431 // Class extensions require a special treatment. Use an existing one. 432 // Note that 'getClassExtension()' can return NULL. 433 CDecl = IDecl->getClassExtension(); 434 if (IDecl->getImplementation()) { 435 Diag(ClassLoc, diag::err_class_extension_after_impl) << ClassName; 436 Diag(IDecl->getImplementation()->getLocation(), 437 diag::note_implementation_declared); 438 } 439 } 440 441 if (!CDecl) { 442 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc, 443 ClassLoc, CategoryLoc, CategoryName); 444 // FIXME: PushOnScopeChains? 445 CurContext->addDecl(CDecl); 446 447 CDecl->setClassInterface(IDecl); 448 // Insert first use of class extension to the list of class's categories. 449 if (!CategoryName) 450 CDecl->insertNextClassCategory(); 451 } 452 453 // If the interface is deprecated, warn about it. 454 (void)DiagnoseUseOfDecl(IDecl, ClassLoc); 455 456 if (CategoryName) { 457 /// Check for duplicate interface declaration for this category 458 ObjCCategoryDecl *CDeclChain; 459 for (CDeclChain = IDecl->getCategoryList(); CDeclChain; 460 CDeclChain = CDeclChain->getNextClassCategory()) { 461 if (CDeclChain->getIdentifier() == CategoryName) { 462 // Class extensions can be declared multiple times. 463 Diag(CategoryLoc, diag::warn_dup_category_def) 464 << ClassName << CategoryName; 465 Diag(CDeclChain->getLocation(), diag::note_previous_definition); 466 break; 467 } 468 } 469 if (!CDeclChain) 470 CDecl->insertNextClassCategory(); 471 } 472 473 if (NumProtoRefs) { 474 CDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs, 475 ProtoLocs, Context); 476 // Protocols in the class extension belong to the class. 477 if (CDecl->IsClassExtension()) 478 IDecl->mergeClassExtensionProtocolList((ObjCProtocolDecl**)ProtoRefs, 479 NumProtoRefs, ProtoLocs, 480 Context); 481 } 482 483 CheckObjCDeclScope(CDecl); 484 return DeclPtrTy::make(CDecl); 485} 486 487/// ActOnStartCategoryImplementation - Perform semantic checks on the 488/// category implementation declaration and build an ObjCCategoryImplDecl 489/// object. 490Sema::DeclPtrTy Sema::ActOnStartCategoryImplementation( 491 SourceLocation AtCatImplLoc, 492 IdentifierInfo *ClassName, SourceLocation ClassLoc, 493 IdentifierInfo *CatName, SourceLocation CatLoc) { 494 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc); 495 ObjCCategoryDecl *CatIDecl = 0; 496 if (IDecl) { 497 CatIDecl = IDecl->FindCategoryDeclaration(CatName); 498 if (!CatIDecl) { 499 // Category @implementation with no corresponding @interface. 500 // Create and install one. 501 CatIDecl = ObjCCategoryDecl::Create(Context, CurContext, SourceLocation(), 502 SourceLocation(), SourceLocation(), 503 CatName); 504 CatIDecl->setClassInterface(IDecl); 505 CatIDecl->insertNextClassCategory(); 506 } 507 } 508 509 ObjCCategoryImplDecl *CDecl = 510 ObjCCategoryImplDecl::Create(Context, CurContext, AtCatImplLoc, CatName, 511 IDecl); 512 /// Check that class of this category is already completely declared. 513 if (!IDecl || IDecl->isForwardDecl()) 514 Diag(ClassLoc, diag::err_undef_interface) << ClassName; 515 516 // FIXME: PushOnScopeChains? 517 CurContext->addDecl(CDecl); 518 519 /// Check that CatName, category name, is not used in another implementation. 520 if (CatIDecl) { 521 if (CatIDecl->getImplementation()) { 522 Diag(ClassLoc, diag::err_dup_implementation_category) << ClassName 523 << CatName; 524 Diag(CatIDecl->getImplementation()->getLocation(), 525 diag::note_previous_definition); 526 } else 527 CatIDecl->setImplementation(CDecl); 528 } 529 530 CheckObjCDeclScope(CDecl); 531 return DeclPtrTy::make(CDecl); 532} 533 534Sema::DeclPtrTy Sema::ActOnStartClassImplementation( 535 SourceLocation AtClassImplLoc, 536 IdentifierInfo *ClassName, SourceLocation ClassLoc, 537 IdentifierInfo *SuperClassname, 538 SourceLocation SuperClassLoc) { 539 ObjCInterfaceDecl* IDecl = 0; 540 // Check for another declaration kind with the same name. 541 NamedDecl *PrevDecl 542 = LookupSingleName(TUScope, ClassName, LookupOrdinaryName); 543 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 544 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName; 545 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 546 } else if ((IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl))) { 547 // If this is a forward declaration of an interface, warn. 548 if (IDecl->isForwardDecl()) { 549 Diag(ClassLoc, diag::warn_undef_interface) << ClassName; 550 IDecl = 0; 551 } 552 } else { 553 // We did not find anything with the name ClassName; try to correct for 554 // typos in the class name. 555 LookupResult R(*this, ClassName, ClassLoc, LookupOrdinaryName); 556 if (CorrectTypo(R, TUScope, 0) && 557 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 558 // Suggest the (potentially) correct interface name. However, put the 559 // fix-it hint itself in a separate note, since changing the name in 560 // the warning would make the fix-it change semantics.However, don't 561 // provide a code-modification hint or use the typo name for recovery, 562 // because this is just a warning. The program may actually be correct. 563 Diag(ClassLoc, diag::warn_undef_interface_suggest) 564 << ClassName << R.getLookupName(); 565 Diag(IDecl->getLocation(), diag::note_previous_decl) 566 << R.getLookupName() 567 << FixItHint::CreateReplacement(ClassLoc, 568 R.getLookupName().getAsString()); 569 IDecl = 0; 570 } else { 571 Diag(ClassLoc, diag::warn_undef_interface) << ClassName; 572 } 573 } 574 575 // Check that super class name is valid class name 576 ObjCInterfaceDecl* SDecl = 0; 577 if (SuperClassname) { 578 // Check if a different kind of symbol declared in this scope. 579 PrevDecl = LookupSingleName(TUScope, SuperClassname, LookupOrdinaryName); 580 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 581 Diag(SuperClassLoc, diag::err_redefinition_different_kind) 582 << SuperClassname; 583 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 584 } else { 585 SDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 586 if (!SDecl) 587 Diag(SuperClassLoc, diag::err_undef_superclass) 588 << SuperClassname << ClassName; 589 else if (IDecl && IDecl->getSuperClass() != SDecl) { 590 // This implementation and its interface do not have the same 591 // super class. 592 Diag(SuperClassLoc, diag::err_conflicting_super_class) 593 << SDecl->getDeclName(); 594 Diag(SDecl->getLocation(), diag::note_previous_definition); 595 } 596 } 597 } 598 599 if (!IDecl) { 600 // Legacy case of @implementation with no corresponding @interface. 601 // Build, chain & install the interface decl into the identifier. 602 603 // FIXME: Do we support attributes on the @implementation? If so we should 604 // copy them over. 605 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtClassImplLoc, 606 ClassName, ClassLoc, false, true); 607 IDecl->setSuperClass(SDecl); 608 IDecl->setLocEnd(ClassLoc); 609 610 PushOnScopeChains(IDecl, TUScope); 611 } else { 612 // Mark the interface as being completed, even if it was just as 613 // @class ....; 614 // declaration; the user cannot reopen it. 615 IDecl->setForwardDecl(false); 616 } 617 618 ObjCImplementationDecl* IMPDecl = 619 ObjCImplementationDecl::Create(Context, CurContext, AtClassImplLoc, 620 IDecl, SDecl); 621 622 if (CheckObjCDeclScope(IMPDecl)) 623 return DeclPtrTy::make(IMPDecl); 624 625 // Check that there is no duplicate implementation of this class. 626 if (IDecl->getImplementation()) { 627 // FIXME: Don't leak everything! 628 Diag(ClassLoc, diag::err_dup_implementation_class) << ClassName; 629 Diag(IDecl->getImplementation()->getLocation(), 630 diag::note_previous_definition); 631 } else { // add it to the list. 632 IDecl->setImplementation(IMPDecl); 633 PushOnScopeChains(IMPDecl, TUScope); 634 } 635 return DeclPtrTy::make(IMPDecl); 636} 637 638void Sema::CheckImplementationIvars(ObjCImplementationDecl *ImpDecl, 639 ObjCIvarDecl **ivars, unsigned numIvars, 640 SourceLocation RBrace) { 641 assert(ImpDecl && "missing implementation decl"); 642 ObjCInterfaceDecl* IDecl = ImpDecl->getClassInterface(); 643 if (!IDecl) 644 return; 645 /// Check case of non-existing @interface decl. 646 /// (legacy objective-c @implementation decl without an @interface decl). 647 /// Add implementations's ivar to the synthesize class's ivar list. 648 if (IDecl->isImplicitInterfaceDecl()) { 649 IDecl->setLocEnd(RBrace); 650 // Add ivar's to class's DeclContext. 651 for (unsigned i = 0, e = numIvars; i != e; ++i) { 652 ivars[i]->setLexicalDeclContext(ImpDecl); 653 IDecl->makeDeclVisibleInContext(ivars[i], false); 654 ImpDecl->addDecl(ivars[i]); 655 } 656 657 return; 658 } 659 // If implementation has empty ivar list, just return. 660 if (numIvars == 0) 661 return; 662 663 assert(ivars && "missing @implementation ivars"); 664 if (LangOpts.ObjCNonFragileABI2) { 665 if (ImpDecl->getSuperClass()) 666 Diag(ImpDecl->getLocation(), diag::warn_on_superclass_use); 667 for (unsigned i = 0; i < numIvars; i++) { 668 ObjCIvarDecl* ImplIvar = ivars[i]; 669 if (const ObjCIvarDecl *ClsIvar = 670 IDecl->getIvarDecl(ImplIvar->getIdentifier())) { 671 Diag(ImplIvar->getLocation(), diag::err_duplicate_ivar_declaration); 672 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 673 continue; 674 } 675 // Instance ivar to Implementation's DeclContext. 676 ImplIvar->setLexicalDeclContext(ImpDecl); 677 IDecl->makeDeclVisibleInContext(ImplIvar, false); 678 ImpDecl->addDecl(ImplIvar); 679 } 680 return; 681 } 682 // Check interface's Ivar list against those in the implementation. 683 // names and types must match. 684 // 685 unsigned j = 0; 686 ObjCInterfaceDecl::ivar_iterator 687 IVI = IDecl->ivar_begin(), IVE = IDecl->ivar_end(); 688 for (; numIvars > 0 && IVI != IVE; ++IVI) { 689 ObjCIvarDecl* ImplIvar = ivars[j++]; 690 ObjCIvarDecl* ClsIvar = *IVI; 691 assert (ImplIvar && "missing implementation ivar"); 692 assert (ClsIvar && "missing class ivar"); 693 694 // First, make sure the types match. 695 if (Context.getCanonicalType(ImplIvar->getType()) != 696 Context.getCanonicalType(ClsIvar->getType())) { 697 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_type) 698 << ImplIvar->getIdentifier() 699 << ImplIvar->getType() << ClsIvar->getType(); 700 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 701 } else if (ImplIvar->isBitField() && ClsIvar->isBitField()) { 702 Expr *ImplBitWidth = ImplIvar->getBitWidth(); 703 Expr *ClsBitWidth = ClsIvar->getBitWidth(); 704 if (ImplBitWidth->EvaluateAsInt(Context).getZExtValue() != 705 ClsBitWidth->EvaluateAsInt(Context).getZExtValue()) { 706 Diag(ImplBitWidth->getLocStart(), diag::err_conflicting_ivar_bitwidth) 707 << ImplIvar->getIdentifier(); 708 Diag(ClsBitWidth->getLocStart(), diag::note_previous_definition); 709 } 710 } 711 // Make sure the names are identical. 712 if (ImplIvar->getIdentifier() != ClsIvar->getIdentifier()) { 713 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_name) 714 << ImplIvar->getIdentifier() << ClsIvar->getIdentifier(); 715 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 716 } 717 --numIvars; 718 } 719 720 if (numIvars > 0) 721 Diag(ivars[j]->getLocation(), diag::err_inconsistant_ivar_count); 722 else if (IVI != IVE) 723 Diag((*IVI)->getLocation(), diag::err_inconsistant_ivar_count); 724} 725 726void Sema::WarnUndefinedMethod(SourceLocation ImpLoc, ObjCMethodDecl *method, 727 bool &IncompleteImpl, unsigned DiagID) { 728 if (!IncompleteImpl) { 729 Diag(ImpLoc, diag::warn_incomplete_impl); 730 IncompleteImpl = true; 731 } 732 Diag(method->getLocation(), DiagID) 733 << method->getDeclName(); 734} 735 736void Sema::WarnConflictingTypedMethods(ObjCMethodDecl *ImpMethodDecl, 737 ObjCMethodDecl *IntfMethodDecl) { 738 if (!Context.typesAreCompatible(IntfMethodDecl->getResultType(), 739 ImpMethodDecl->getResultType()) && 740 !Context.QualifiedIdConformsQualifiedId(IntfMethodDecl->getResultType(), 741 ImpMethodDecl->getResultType())) { 742 Diag(ImpMethodDecl->getLocation(), diag::warn_conflicting_ret_types) 743 << ImpMethodDecl->getDeclName() << IntfMethodDecl->getResultType() 744 << ImpMethodDecl->getResultType(); 745 Diag(IntfMethodDecl->getLocation(), diag::note_previous_definition); 746 } 747 748 for (ObjCMethodDecl::param_iterator IM = ImpMethodDecl->param_begin(), 749 IF = IntfMethodDecl->param_begin(), EM = ImpMethodDecl->param_end(); 750 IM != EM; ++IM, ++IF) { 751 QualType ParmDeclTy = (*IF)->getType().getUnqualifiedType(); 752 QualType ParmImpTy = (*IM)->getType().getUnqualifiedType(); 753 if (Context.typesAreCompatible(ParmDeclTy, ParmImpTy) || 754 Context.QualifiedIdConformsQualifiedId(ParmDeclTy, ParmImpTy)) 755 continue; 756 757 Diag((*IM)->getLocation(), diag::warn_conflicting_param_types) 758 << ImpMethodDecl->getDeclName() << (*IF)->getType() 759 << (*IM)->getType(); 760 Diag((*IF)->getLocation(), diag::note_previous_definition); 761 } 762} 763 764/// FIXME: Type hierarchies in Objective-C can be deep. We could most likely 765/// improve the efficiency of selector lookups and type checking by associating 766/// with each protocol / interface / category the flattened instance tables. If 767/// we used an immutable set to keep the table then it wouldn't add significant 768/// memory cost and it would be handy for lookups. 769 770/// CheckProtocolMethodDefs - This routine checks unimplemented methods 771/// Declared in protocol, and those referenced by it. 772void Sema::CheckProtocolMethodDefs(SourceLocation ImpLoc, 773 ObjCProtocolDecl *PDecl, 774 bool& IncompleteImpl, 775 const llvm::DenseSet<Selector> &InsMap, 776 const llvm::DenseSet<Selector> &ClsMap, 777 ObjCContainerDecl *CDecl) { 778 ObjCInterfaceDecl *IDecl; 779 if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl)) 780 IDecl = C->getClassInterface(); 781 else 782 IDecl = dyn_cast<ObjCInterfaceDecl>(CDecl); 783 assert (IDecl && "CheckProtocolMethodDefs - IDecl is null"); 784 785 ObjCInterfaceDecl *Super = IDecl->getSuperClass(); 786 ObjCInterfaceDecl *NSIDecl = 0; 787 if (getLangOptions().NeXTRuntime) { 788 // check to see if class implements forwardInvocation method and objects 789 // of this class are derived from 'NSProxy' so that to forward requests 790 // from one object to another. 791 // Under such conditions, which means that every method possible is 792 // implemented in the class, we should not issue "Method definition not 793 // found" warnings. 794 // FIXME: Use a general GetUnarySelector method for this. 795 IdentifierInfo* II = &Context.Idents.get("forwardInvocation"); 796 Selector fISelector = Context.Selectors.getSelector(1, &II); 797 if (InsMap.count(fISelector)) 798 // Is IDecl derived from 'NSProxy'? If so, no instance methods 799 // need be implemented in the implementation. 800 NSIDecl = IDecl->lookupInheritedClass(&Context.Idents.get("NSProxy")); 801 } 802 803 // If a method lookup fails locally we still need to look and see if 804 // the method was implemented by a base class or an inherited 805 // protocol. This lookup is slow, but occurs rarely in correct code 806 // and otherwise would terminate in a warning. 807 808 // check unimplemented instance methods. 809 if (!NSIDecl) 810 for (ObjCProtocolDecl::instmeth_iterator I = PDecl->instmeth_begin(), 811 E = PDecl->instmeth_end(); I != E; ++I) { 812 ObjCMethodDecl *method = *I; 813 if (method->getImplementationControl() != ObjCMethodDecl::Optional && 814 !method->isSynthesized() && !InsMap.count(method->getSelector()) && 815 (!Super || 816 !Super->lookupInstanceMethod(method->getSelector()))) { 817 // Ugly, but necessary. Method declared in protcol might have 818 // have been synthesized due to a property declared in the class which 819 // uses the protocol. 820 ObjCMethodDecl *MethodInClass = 821 IDecl->lookupInstanceMethod(method->getSelector()); 822 if (!MethodInClass || !MethodInClass->isSynthesized()) { 823 unsigned DIAG = diag::warn_unimplemented_protocol_method; 824 if (Diags.getDiagnosticLevel(DIAG) != Diagnostic::Ignored) { 825 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG); 826 Diag(CDecl->getLocation(), diag::note_required_for_protocol_at) 827 << PDecl->getDeclName(); 828 } 829 } 830 } 831 } 832 // check unimplemented class methods 833 for (ObjCProtocolDecl::classmeth_iterator 834 I = PDecl->classmeth_begin(), E = PDecl->classmeth_end(); 835 I != E; ++I) { 836 ObjCMethodDecl *method = *I; 837 if (method->getImplementationControl() != ObjCMethodDecl::Optional && 838 !ClsMap.count(method->getSelector()) && 839 (!Super || !Super->lookupClassMethod(method->getSelector()))) { 840 unsigned DIAG = diag::warn_unimplemented_protocol_method; 841 if (Diags.getDiagnosticLevel(DIAG) != Diagnostic::Ignored) { 842 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG); 843 Diag(IDecl->getLocation(), diag::note_required_for_protocol_at) << 844 PDecl->getDeclName(); 845 } 846 } 847 } 848 // Check on this protocols's referenced protocols, recursively. 849 for (ObjCProtocolDecl::protocol_iterator PI = PDecl->protocol_begin(), 850 E = PDecl->protocol_end(); PI != E; ++PI) 851 CheckProtocolMethodDefs(ImpLoc, *PI, IncompleteImpl, InsMap, ClsMap, IDecl); 852} 853 854/// MatchAllMethodDeclarations - Check methods declaraed in interface or 855/// or protocol against those declared in their implementations. 856/// 857void Sema::MatchAllMethodDeclarations(const llvm::DenseSet<Selector> &InsMap, 858 const llvm::DenseSet<Selector> &ClsMap, 859 llvm::DenseSet<Selector> &InsMapSeen, 860 llvm::DenseSet<Selector> &ClsMapSeen, 861 ObjCImplDecl* IMPDecl, 862 ObjCContainerDecl* CDecl, 863 bool &IncompleteImpl, 864 bool ImmediateClass) { 865 // Check and see if instance methods in class interface have been 866 // implemented in the implementation class. If so, their types match. 867 for (ObjCInterfaceDecl::instmeth_iterator I = CDecl->instmeth_begin(), 868 E = CDecl->instmeth_end(); I != E; ++I) { 869 if (InsMapSeen.count((*I)->getSelector())) 870 continue; 871 InsMapSeen.insert((*I)->getSelector()); 872 if (!(*I)->isSynthesized() && 873 !InsMap.count((*I)->getSelector())) { 874 if (ImmediateClass) 875 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl, 876 diag::note_undef_method_impl); 877 continue; 878 } else { 879 ObjCMethodDecl *ImpMethodDecl = 880 IMPDecl->getInstanceMethod((*I)->getSelector()); 881 ObjCMethodDecl *IntfMethodDecl = 882 CDecl->getInstanceMethod((*I)->getSelector()); 883 assert(IntfMethodDecl && 884 "IntfMethodDecl is null in ImplMethodsVsClassMethods"); 885 // ImpMethodDecl may be null as in a @dynamic property. 886 if (ImpMethodDecl) 887 WarnConflictingTypedMethods(ImpMethodDecl, IntfMethodDecl); 888 } 889 } 890 891 // Check and see if class methods in class interface have been 892 // implemented in the implementation class. If so, their types match. 893 for (ObjCInterfaceDecl::classmeth_iterator 894 I = CDecl->classmeth_begin(), E = CDecl->classmeth_end(); I != E; ++I) { 895 if (ClsMapSeen.count((*I)->getSelector())) 896 continue; 897 ClsMapSeen.insert((*I)->getSelector()); 898 if (!ClsMap.count((*I)->getSelector())) { 899 if (ImmediateClass) 900 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl, 901 diag::note_undef_method_impl); 902 } else { 903 ObjCMethodDecl *ImpMethodDecl = 904 IMPDecl->getClassMethod((*I)->getSelector()); 905 ObjCMethodDecl *IntfMethodDecl = 906 CDecl->getClassMethod((*I)->getSelector()); 907 WarnConflictingTypedMethods(ImpMethodDecl, IntfMethodDecl); 908 } 909 } 910 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) { 911 // Check for any implementation of a methods declared in protocol. 912 for (ObjCInterfaceDecl::protocol_iterator PI = I->protocol_begin(), 913 E = I->protocol_end(); PI != E; ++PI) 914 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 915 IMPDecl, 916 (*PI), IncompleteImpl, false); 917 if (I->getSuperClass()) 918 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 919 IMPDecl, 920 I->getSuperClass(), IncompleteImpl, false); 921 } 922} 923 924void Sema::ImplMethodsVsClassMethods(ObjCImplDecl* IMPDecl, 925 ObjCContainerDecl* CDecl, 926 bool IncompleteImpl) { 927 llvm::DenseSet<Selector> InsMap; 928 // Check and see if instance methods in class interface have been 929 // implemented in the implementation class. 930 for (ObjCImplementationDecl::instmeth_iterator 931 I = IMPDecl->instmeth_begin(), E = IMPDecl->instmeth_end(); I!=E; ++I) 932 InsMap.insert((*I)->getSelector()); 933 934 // Check and see if properties declared in the interface have either 1) 935 // an implementation or 2) there is a @synthesize/@dynamic implementation 936 // of the property in the @implementation. 937 if (isa<ObjCInterfaceDecl>(CDecl)) 938 DiagnoseUnimplementedProperties(IMPDecl, CDecl, InsMap); 939 940 llvm::DenseSet<Selector> ClsMap; 941 for (ObjCImplementationDecl::classmeth_iterator 942 I = IMPDecl->classmeth_begin(), 943 E = IMPDecl->classmeth_end(); I != E; ++I) 944 ClsMap.insert((*I)->getSelector()); 945 946 // Check for type conflict of methods declared in a class/protocol and 947 // its implementation; if any. 948 llvm::DenseSet<Selector> InsMapSeen, ClsMapSeen; 949 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 950 IMPDecl, CDecl, 951 IncompleteImpl, true); 952 953 // Check the protocol list for unimplemented methods in the @implementation 954 // class. 955 // Check and see if class methods in class interface have been 956 // implemented in the implementation class. 957 958 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) { 959 for (ObjCInterfaceDecl::protocol_iterator PI = I->protocol_begin(), 960 E = I->protocol_end(); PI != E; ++PI) 961 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl, 962 InsMap, ClsMap, I); 963 // Check class extensions (unnamed categories) 964 for (ObjCCategoryDecl *Categories = I->getCategoryList(); 965 Categories; Categories = Categories->getNextClassCategory()) { 966 if (Categories->IsClassExtension()) { 967 ImplMethodsVsClassMethods(IMPDecl, Categories, IncompleteImpl); 968 break; 969 } 970 } 971 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl)) { 972 // For extended class, unimplemented methods in its protocols will 973 // be reported in the primary class. 974 if (!C->IsClassExtension()) { 975 for (ObjCCategoryDecl::protocol_iterator PI = C->protocol_begin(), 976 E = C->protocol_end(); PI != E; ++PI) 977 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl, 978 InsMap, ClsMap, CDecl); 979 // Report unimplemented properties in the category as well. 980 // When reporting on missing setter/getters, do not report when 981 // setter/getter is implemented in category's primary class 982 // implementation. 983 if (ObjCInterfaceDecl *ID = C->getClassInterface()) 984 if (ObjCImplDecl *IMP = ID->getImplementation()) { 985 for (ObjCImplementationDecl::instmeth_iterator 986 I = IMP->instmeth_begin(), E = IMP->instmeth_end(); I!=E; ++I) 987 InsMap.insert((*I)->getSelector()); 988 } 989 DiagnoseUnimplementedProperties(IMPDecl, CDecl, InsMap); 990 } 991 } else 992 assert(false && "invalid ObjCContainerDecl type."); 993} 994 995/// ActOnForwardClassDeclaration - 996Action::DeclPtrTy 997Sema::ActOnForwardClassDeclaration(SourceLocation AtClassLoc, 998 IdentifierInfo **IdentList, 999 SourceLocation *IdentLocs, 1000 unsigned NumElts) { 1001 llvm::SmallVector<ObjCInterfaceDecl*, 32> Interfaces; 1002 1003 for (unsigned i = 0; i != NumElts; ++i) { 1004 // Check for another declaration kind with the same name. 1005 NamedDecl *PrevDecl 1006 = LookupSingleName(TUScope, IdentList[i], LookupOrdinaryName); 1007 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1008 // Maybe we will complain about the shadowed template parameter. 1009 DiagnoseTemplateParameterShadow(AtClassLoc, PrevDecl); 1010 // Just pretend that we didn't see the previous declaration. 1011 PrevDecl = 0; 1012 } 1013 1014 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 1015 // GCC apparently allows the following idiom: 1016 // 1017 // typedef NSObject < XCElementTogglerP > XCElementToggler; 1018 // @class XCElementToggler; 1019 // 1020 // FIXME: Make an extension? 1021 TypedefDecl *TDD = dyn_cast<TypedefDecl>(PrevDecl); 1022 if (!TDD || !isa<ObjCInterfaceType>(TDD->getUnderlyingType())) { 1023 Diag(AtClassLoc, diag::err_redefinition_different_kind) << IdentList[i]; 1024 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1025 } else if (TDD) { 1026 // a forward class declaration matching a typedef name of a class refers 1027 // to the underlying class. 1028 if (ObjCInterfaceType * OI = 1029 dyn_cast<ObjCInterfaceType>(TDD->getUnderlyingType())) 1030 PrevDecl = OI->getDecl(); 1031 } 1032 } 1033 ObjCInterfaceDecl *IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 1034 if (!IDecl) { // Not already seen? Make a forward decl. 1035 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtClassLoc, 1036 IdentList[i], IdentLocs[i], true); 1037 1038 // Push the ObjCInterfaceDecl on the scope chain but do *not* add it to 1039 // the current DeclContext. This prevents clients that walk DeclContext 1040 // from seeing the imaginary ObjCInterfaceDecl until it is actually 1041 // declared later (if at all). We also take care to explicitly make 1042 // sure this declaration is visible for name lookup. 1043 PushOnScopeChains(IDecl, TUScope, false); 1044 CurContext->makeDeclVisibleInContext(IDecl, true); 1045 } 1046 1047 Interfaces.push_back(IDecl); 1048 } 1049 1050 assert(Interfaces.size() == NumElts); 1051 ObjCClassDecl *CDecl = ObjCClassDecl::Create(Context, CurContext, AtClassLoc, 1052 Interfaces.data(), IdentLocs, 1053 Interfaces.size()); 1054 CurContext->addDecl(CDecl); 1055 CheckObjCDeclScope(CDecl); 1056 return DeclPtrTy::make(CDecl); 1057} 1058 1059 1060/// MatchTwoMethodDeclarations - Checks that two methods have matching type and 1061/// returns true, or false, accordingly. 1062/// TODO: Handle protocol list; such as id<p1,p2> in type comparisons 1063bool Sema::MatchTwoMethodDeclarations(const ObjCMethodDecl *Method, 1064 const ObjCMethodDecl *PrevMethod, 1065 bool matchBasedOnSizeAndAlignment) { 1066 QualType T1 = Context.getCanonicalType(Method->getResultType()); 1067 QualType T2 = Context.getCanonicalType(PrevMethod->getResultType()); 1068 1069 if (T1 != T2) { 1070 // The result types are different. 1071 if (!matchBasedOnSizeAndAlignment) 1072 return false; 1073 // Incomplete types don't have a size and alignment. 1074 if (T1->isIncompleteType() || T2->isIncompleteType()) 1075 return false; 1076 // Check is based on size and alignment. 1077 if (Context.getTypeInfo(T1) != Context.getTypeInfo(T2)) 1078 return false; 1079 } 1080 1081 ObjCMethodDecl::param_iterator ParamI = Method->param_begin(), 1082 E = Method->param_end(); 1083 ObjCMethodDecl::param_iterator PrevI = PrevMethod->param_begin(); 1084 1085 for (; ParamI != E; ++ParamI, ++PrevI) { 1086 assert(PrevI != PrevMethod->param_end() && "Param mismatch"); 1087 T1 = Context.getCanonicalType((*ParamI)->getType()); 1088 T2 = Context.getCanonicalType((*PrevI)->getType()); 1089 if (T1 != T2) { 1090 // The result types are different. 1091 if (!matchBasedOnSizeAndAlignment) 1092 return false; 1093 // Incomplete types don't have a size and alignment. 1094 if (T1->isIncompleteType() || T2->isIncompleteType()) 1095 return false; 1096 // Check is based on size and alignment. 1097 if (Context.getTypeInfo(T1) != Context.getTypeInfo(T2)) 1098 return false; 1099 } 1100 } 1101 return true; 1102} 1103 1104/// \brief Read the contents of the instance and factory method pools 1105/// for a given selector from external storage. 1106/// 1107/// This routine should only be called once, when neither the instance 1108/// nor the factory method pool has an entry for this selector. 1109Sema::MethodPool::iterator Sema::ReadMethodPool(Selector Sel, 1110 bool isInstance) { 1111 assert(ExternalSource && "We need an external AST source"); 1112 assert(InstanceMethodPool.find(Sel) == InstanceMethodPool.end() && 1113 "Selector data already loaded into the instance method pool"); 1114 assert(FactoryMethodPool.find(Sel) == FactoryMethodPool.end() && 1115 "Selector data already loaded into the factory method pool"); 1116 1117 // Read the method list from the external source. 1118 std::pair<ObjCMethodList, ObjCMethodList> Methods 1119 = ExternalSource->ReadMethodPool(Sel); 1120 1121 if (isInstance) { 1122 if (Methods.second.Method) 1123 FactoryMethodPool[Sel] = Methods.second; 1124 return InstanceMethodPool.insert(std::make_pair(Sel, Methods.first)).first; 1125 } 1126 1127 if (Methods.first.Method) 1128 InstanceMethodPool[Sel] = Methods.first; 1129 1130 return FactoryMethodPool.insert(std::make_pair(Sel, Methods.second)).first; 1131} 1132 1133void Sema::AddInstanceMethodToGlobalPool(ObjCMethodDecl *Method) { 1134 llvm::DenseMap<Selector, ObjCMethodList>::iterator Pos 1135 = InstanceMethodPool.find(Method->getSelector()); 1136 if (Pos == InstanceMethodPool.end()) { 1137 if (ExternalSource && !FactoryMethodPool.count(Method->getSelector())) 1138 Pos = ReadMethodPool(Method->getSelector(), /*isInstance=*/true); 1139 else 1140 Pos = InstanceMethodPool.insert(std::make_pair(Method->getSelector(), 1141 ObjCMethodList())).first; 1142 } 1143 1144 ObjCMethodList &Entry = Pos->second; 1145 if (Entry.Method == 0) { 1146 // Haven't seen a method with this selector name yet - add it. 1147 Entry.Method = Method; 1148 Entry.Next = 0; 1149 return; 1150 } 1151 1152 // We've seen a method with this name, see if we have already seen this type 1153 // signature. 1154 for (ObjCMethodList *List = &Entry; List; List = List->Next) 1155 if (MatchTwoMethodDeclarations(Method, List->Method)) 1156 return; 1157 1158 // We have a new signature for an existing method - add it. 1159 // This is extremely rare. Only 1% of Cocoa selectors are "overloaded". 1160 ObjCMethodList *Mem = BumpAlloc.Allocate<ObjCMethodList>(); 1161 Entry.Next = new (Mem) ObjCMethodList(Method, Entry.Next); 1162} 1163 1164// FIXME: Finish implementing -Wno-strict-selector-match. 1165ObjCMethodDecl *Sema::LookupInstanceMethodInGlobalPool(Selector Sel, 1166 SourceRange R, 1167 bool warn) { 1168 llvm::DenseMap<Selector, ObjCMethodList>::iterator Pos 1169 = InstanceMethodPool.find(Sel); 1170 if (Pos == InstanceMethodPool.end()) { 1171 if (ExternalSource && !FactoryMethodPool.count(Sel)) 1172 Pos = ReadMethodPool(Sel, /*isInstance=*/true); 1173 else 1174 return 0; 1175 } 1176 1177 ObjCMethodList &MethList = Pos->second; 1178 bool issueWarning = false; 1179 1180 if (MethList.Method && MethList.Next) { 1181 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) 1182 // This checks if the methods differ by size & alignment. 1183 if (!MatchTwoMethodDeclarations(MethList.Method, Next->Method, true)) 1184 issueWarning = warn; 1185 } 1186 if (issueWarning && (MethList.Method && MethList.Next)) { 1187 Diag(R.getBegin(), diag::warn_multiple_method_decl) << Sel << R; 1188 Diag(MethList.Method->getLocStart(), diag::note_using) 1189 << MethList.Method->getSourceRange(); 1190 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) 1191 Diag(Next->Method->getLocStart(), diag::note_also_found) 1192 << Next->Method->getSourceRange(); 1193 } 1194 return MethList.Method; 1195} 1196 1197void Sema::AddFactoryMethodToGlobalPool(ObjCMethodDecl *Method) { 1198 llvm::DenseMap<Selector, ObjCMethodList>::iterator Pos 1199 = FactoryMethodPool.find(Method->getSelector()); 1200 if (Pos == FactoryMethodPool.end()) { 1201 if (ExternalSource && !InstanceMethodPool.count(Method->getSelector())) 1202 Pos = ReadMethodPool(Method->getSelector(), /*isInstance=*/false); 1203 else 1204 Pos = FactoryMethodPool.insert(std::make_pair(Method->getSelector(), 1205 ObjCMethodList())).first; 1206 } 1207 1208 ObjCMethodList &FirstMethod = Pos->second; 1209 if (!FirstMethod.Method) { 1210 // Haven't seen a method with this selector name yet - add it. 1211 FirstMethod.Method = Method; 1212 FirstMethod.Next = 0; 1213 } else { 1214 // We've seen a method with this name, now check the type signature(s). 1215 bool match = MatchTwoMethodDeclarations(Method, FirstMethod.Method); 1216 1217 for (ObjCMethodList *Next = FirstMethod.Next; !match && Next; 1218 Next = Next->Next) 1219 match = MatchTwoMethodDeclarations(Method, Next->Method); 1220 1221 if (!match) { 1222 // We have a new signature for an existing method - add it. 1223 // This is extremely rare. Only 1% of Cocoa selectors are "overloaded". 1224 ObjCMethodList *Mem = BumpAlloc.Allocate<ObjCMethodList>(); 1225 ObjCMethodList *OMI = new (Mem) ObjCMethodList(Method, FirstMethod.Next); 1226 FirstMethod.Next = OMI; 1227 } 1228 } 1229} 1230 1231ObjCMethodDecl *Sema::LookupFactoryMethodInGlobalPool(Selector Sel, 1232 SourceRange R) { 1233 llvm::DenseMap<Selector, ObjCMethodList>::iterator Pos 1234 = FactoryMethodPool.find(Sel); 1235 if (Pos == FactoryMethodPool.end()) { 1236 if (ExternalSource && !InstanceMethodPool.count(Sel)) 1237 Pos = ReadMethodPool(Sel, /*isInstance=*/false); 1238 else 1239 return 0; 1240 } 1241 1242 ObjCMethodList &MethList = Pos->second; 1243 bool issueWarning = false; 1244 1245 if (MethList.Method && MethList.Next) { 1246 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) 1247 // This checks if the methods differ by size & alignment. 1248 if (!MatchTwoMethodDeclarations(MethList.Method, Next->Method, true)) 1249 issueWarning = true; 1250 } 1251 if (issueWarning && (MethList.Method && MethList.Next)) { 1252 Diag(R.getBegin(), diag::warn_multiple_method_decl) << Sel << R; 1253 Diag(MethList.Method->getLocStart(), diag::note_using) 1254 << MethList.Method->getSourceRange(); 1255 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) 1256 Diag(Next->Method->getLocStart(), diag::note_also_found) 1257 << Next->Method->getSourceRange(); 1258 } 1259 return MethList.Method; 1260} 1261 1262/// CompareMethodParamsInBaseAndSuper - This routine compares methods with 1263/// identical selector names in current and its super classes and issues 1264/// a warning if any of their argument types are incompatible. 1265void Sema::CompareMethodParamsInBaseAndSuper(Decl *ClassDecl, 1266 ObjCMethodDecl *Method, 1267 bool IsInstance) { 1268 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(ClassDecl); 1269 if (ID == 0) return; 1270 1271 while (ObjCInterfaceDecl *SD = ID->getSuperClass()) { 1272 ObjCMethodDecl *SuperMethodDecl = 1273 SD->lookupMethod(Method->getSelector(), IsInstance); 1274 if (SuperMethodDecl == 0) { 1275 ID = SD; 1276 continue; 1277 } 1278 ObjCMethodDecl::param_iterator ParamI = Method->param_begin(), 1279 E = Method->param_end(); 1280 ObjCMethodDecl::param_iterator PrevI = SuperMethodDecl->param_begin(); 1281 for (; ParamI != E; ++ParamI, ++PrevI) { 1282 // Number of parameters are the same and is guaranteed by selector match. 1283 assert(PrevI != SuperMethodDecl->param_end() && "Param mismatch"); 1284 QualType T1 = Context.getCanonicalType((*ParamI)->getType()); 1285 QualType T2 = Context.getCanonicalType((*PrevI)->getType()); 1286 // If type of arguement of method in this class does not match its 1287 // respective argument type in the super class method, issue warning; 1288 if (!Context.typesAreCompatible(T1, T2)) { 1289 Diag((*ParamI)->getLocation(), diag::ext_typecheck_base_super) 1290 << T1 << T2; 1291 Diag(SuperMethodDecl->getLocation(), diag::note_previous_declaration); 1292 return; 1293 } 1294 } 1295 ID = SD; 1296 } 1297} 1298 1299/// DiagnoseDuplicateIvars - 1300/// Check for duplicate ivars in the entire class at the start of 1301/// @implementation. This becomes necesssary because class extension can 1302/// add ivars to a class in random order which will not be known until 1303/// class's @implementation is seen. 1304void Sema::DiagnoseDuplicateIvars(ObjCInterfaceDecl *ID, 1305 ObjCInterfaceDecl *SID) { 1306 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 1307 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 1308 ObjCIvarDecl* Ivar = (*IVI); 1309 if (Ivar->isInvalidDecl()) 1310 continue; 1311 if (IdentifierInfo *II = Ivar->getIdentifier()) { 1312 ObjCIvarDecl* prevIvar = SID->lookupInstanceVariable(II); 1313 if (prevIvar) { 1314 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 1315 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 1316 Ivar->setInvalidDecl(); 1317 } 1318 } 1319 } 1320} 1321 1322// Note: For class/category implemenations, allMethods/allProperties is 1323// always null. 1324void Sema::ActOnAtEnd(SourceRange AtEnd, 1325 DeclPtrTy classDecl, 1326 DeclPtrTy *allMethods, unsigned allNum, 1327 DeclPtrTy *allProperties, unsigned pNum, 1328 DeclGroupPtrTy *allTUVars, unsigned tuvNum) { 1329 Decl *ClassDecl = classDecl.getAs<Decl>(); 1330 1331 // FIXME: If we don't have a ClassDecl, we have an error. We should consider 1332 // always passing in a decl. If the decl has an error, isInvalidDecl() 1333 // should be true. 1334 if (!ClassDecl) 1335 return; 1336 1337 bool isInterfaceDeclKind = 1338 isa<ObjCInterfaceDecl>(ClassDecl) || isa<ObjCCategoryDecl>(ClassDecl) 1339 || isa<ObjCProtocolDecl>(ClassDecl); 1340 bool checkIdenticalMethods = isa<ObjCImplementationDecl>(ClassDecl); 1341 1342 if (!isInterfaceDeclKind && AtEnd.isInvalid()) { 1343 // FIXME: This is wrong. We shouldn't be pretending that there is 1344 // an '@end' in the declaration. 1345 SourceLocation L = ClassDecl->getLocation(); 1346 AtEnd.setBegin(L); 1347 AtEnd.setEnd(L); 1348 Diag(L, diag::warn_missing_atend); 1349 } 1350 1351 DeclContext *DC = dyn_cast<DeclContext>(ClassDecl); 1352 1353 // FIXME: Remove these and use the ObjCContainerDecl/DeclContext. 1354 llvm::DenseMap<Selector, const ObjCMethodDecl*> InsMap; 1355 llvm::DenseMap<Selector, const ObjCMethodDecl*> ClsMap; 1356 1357 for (unsigned i = 0; i < allNum; i++ ) { 1358 ObjCMethodDecl *Method = 1359 cast_or_null<ObjCMethodDecl>(allMethods[i].getAs<Decl>()); 1360 1361 if (!Method) continue; // Already issued a diagnostic. 1362 if (Method->isInstanceMethod()) { 1363 /// Check for instance method of the same name with incompatible types 1364 const ObjCMethodDecl *&PrevMethod = InsMap[Method->getSelector()]; 1365 bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod) 1366 : false; 1367 if ((isInterfaceDeclKind && PrevMethod && !match) 1368 || (checkIdenticalMethods && match)) { 1369 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 1370 << Method->getDeclName(); 1371 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 1372 } else { 1373 DC->addDecl(Method); 1374 InsMap[Method->getSelector()] = Method; 1375 /// The following allows us to typecheck messages to "id". 1376 AddInstanceMethodToGlobalPool(Method); 1377 // verify that the instance method conforms to the same definition of 1378 // parent methods if it shadows one. 1379 CompareMethodParamsInBaseAndSuper(ClassDecl, Method, true); 1380 } 1381 } else { 1382 /// Check for class method of the same name with incompatible types 1383 const ObjCMethodDecl *&PrevMethod = ClsMap[Method->getSelector()]; 1384 bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod) 1385 : false; 1386 if ((isInterfaceDeclKind && PrevMethod && !match) 1387 || (checkIdenticalMethods && match)) { 1388 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 1389 << Method->getDeclName(); 1390 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 1391 } else { 1392 DC->addDecl(Method); 1393 ClsMap[Method->getSelector()] = Method; 1394 /// The following allows us to typecheck messages to "Class". 1395 AddFactoryMethodToGlobalPool(Method); 1396 // verify that the class method conforms to the same definition of 1397 // parent methods if it shadows one. 1398 CompareMethodParamsInBaseAndSuper(ClassDecl, Method, false); 1399 } 1400 } 1401 } 1402 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl>(ClassDecl)) { 1403 // Compares properties declared in this class to those of its 1404 // super class. 1405 ComparePropertiesInBaseAndSuper(I); 1406 CompareProperties(I, DeclPtrTy::make(I)); 1407 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(ClassDecl)) { 1408 // Categories are used to extend the class by declaring new methods. 1409 // By the same token, they are also used to add new properties. No 1410 // need to compare the added property to those in the class. 1411 1412 // Compare protocol properties with those in category 1413 CompareProperties(C, DeclPtrTy::make(C)); 1414 if (C->IsClassExtension()) 1415 DiagnoseClassExtensionDupMethods(C, C->getClassInterface()); 1416 } 1417 if (ObjCContainerDecl *CDecl = dyn_cast<ObjCContainerDecl>(ClassDecl)) { 1418 if (CDecl->getIdentifier()) 1419 // ProcessPropertyDecl is responsible for diagnosing conflicts with any 1420 // user-defined setter/getter. It also synthesizes setter/getter methods 1421 // and adds them to the DeclContext and global method pools. 1422 for (ObjCContainerDecl::prop_iterator I = CDecl->prop_begin(), 1423 E = CDecl->prop_end(); 1424 I != E; ++I) 1425 ProcessPropertyDecl(*I, CDecl); 1426 CDecl->setAtEndRange(AtEnd); 1427 } 1428 if (ObjCImplementationDecl *IC=dyn_cast<ObjCImplementationDecl>(ClassDecl)) { 1429 IC->setAtEndRange(AtEnd); 1430 if (ObjCInterfaceDecl* IDecl = IC->getClassInterface()) { 1431 ImplMethodsVsClassMethods(IC, IDecl); 1432 AtomicPropertySetterGetterRules(IC, IDecl); 1433 if (LangOpts.ObjCNonFragileABI2) 1434 while (IDecl->getSuperClass()) { 1435 DiagnoseDuplicateIvars(IDecl, IDecl->getSuperClass()); 1436 IDecl = IDecl->getSuperClass(); 1437 } 1438 } 1439 } else if (ObjCCategoryImplDecl* CatImplClass = 1440 dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) { 1441 CatImplClass->setAtEndRange(AtEnd); 1442 1443 // Find category interface decl and then check that all methods declared 1444 // in this interface are implemented in the category @implementation. 1445 if (ObjCInterfaceDecl* IDecl = CatImplClass->getClassInterface()) { 1446 for (ObjCCategoryDecl *Categories = IDecl->getCategoryList(); 1447 Categories; Categories = Categories->getNextClassCategory()) { 1448 if (Categories->getIdentifier() == CatImplClass->getIdentifier()) { 1449 ImplMethodsVsClassMethods(CatImplClass, Categories); 1450 break; 1451 } 1452 } 1453 } 1454 } 1455 if (isInterfaceDeclKind) { 1456 // Reject invalid vardecls. 1457 for (unsigned i = 0; i != tuvNum; i++) { 1458 DeclGroupRef DG = allTUVars[i].getAsVal<DeclGroupRef>(); 1459 for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I) 1460 if (VarDecl *VDecl = dyn_cast<VarDecl>(*I)) { 1461 if (!VDecl->hasExternalStorage()) 1462 Diag(VDecl->getLocation(), diag::err_objc_var_decl_inclass); 1463 } 1464 } 1465 } 1466} 1467 1468 1469/// CvtQTToAstBitMask - utility routine to produce an AST bitmask for 1470/// objective-c's type qualifier from the parser version of the same info. 1471static Decl::ObjCDeclQualifier 1472CvtQTToAstBitMask(ObjCDeclSpec::ObjCDeclQualifier PQTVal) { 1473 Decl::ObjCDeclQualifier ret = Decl::OBJC_TQ_None; 1474 if (PQTVal & ObjCDeclSpec::DQ_In) 1475 ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_In); 1476 if (PQTVal & ObjCDeclSpec::DQ_Inout) 1477 ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Inout); 1478 if (PQTVal & ObjCDeclSpec::DQ_Out) 1479 ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Out); 1480 if (PQTVal & ObjCDeclSpec::DQ_Bycopy) 1481 ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Bycopy); 1482 if (PQTVal & ObjCDeclSpec::DQ_Byref) 1483 ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Byref); 1484 if (PQTVal & ObjCDeclSpec::DQ_Oneway) 1485 ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Oneway); 1486 1487 return ret; 1488} 1489 1490Sema::DeclPtrTy Sema::ActOnMethodDeclaration( 1491 SourceLocation MethodLoc, SourceLocation EndLoc, 1492 tok::TokenKind MethodType, DeclPtrTy classDecl, 1493 ObjCDeclSpec &ReturnQT, TypeTy *ReturnType, 1494 Selector Sel, 1495 // optional arguments. The number of types/arguments is obtained 1496 // from the Sel.getNumArgs(). 1497 ObjCArgInfo *ArgInfo, 1498 llvm::SmallVectorImpl<Declarator> &Cdecls, 1499 AttributeList *AttrList, tok::ObjCKeywordKind MethodDeclKind, 1500 bool isVariadic) { 1501 Decl *ClassDecl = classDecl.getAs<Decl>(); 1502 1503 // Make sure we can establish a context for the method. 1504 if (!ClassDecl) { 1505 Diag(MethodLoc, diag::error_missing_method_context); 1506 getLabelMap().clear(); 1507 return DeclPtrTy(); 1508 } 1509 QualType resultDeclType; 1510 1511 TypeSourceInfo *ResultTInfo = 0; 1512 if (ReturnType) { 1513 resultDeclType = GetTypeFromParser(ReturnType, &ResultTInfo); 1514 1515 // Methods cannot return interface types. All ObjC objects are 1516 // passed by reference. 1517 if (resultDeclType->isObjCInterfaceType()) { 1518 Diag(MethodLoc, diag::err_object_cannot_be_passed_returned_by_value) 1519 << 0 << resultDeclType; 1520 return DeclPtrTy(); 1521 } 1522 } else // get the type for "id". 1523 resultDeclType = Context.getObjCIdType(); 1524 1525 ObjCMethodDecl* ObjCMethod = 1526 ObjCMethodDecl::Create(Context, MethodLoc, EndLoc, Sel, resultDeclType, 1527 ResultTInfo, 1528 cast<DeclContext>(ClassDecl), 1529 MethodType == tok::minus, isVariadic, 1530 false, 1531 MethodDeclKind == tok::objc_optional ? 1532 ObjCMethodDecl::Optional : 1533 ObjCMethodDecl::Required); 1534 1535 llvm::SmallVector<ParmVarDecl*, 16> Params; 1536 1537 for (unsigned i = 0, e = Sel.getNumArgs(); i != e; ++i) { 1538 QualType ArgType; 1539 TypeSourceInfo *DI; 1540 1541 if (ArgInfo[i].Type == 0) { 1542 ArgType = Context.getObjCIdType(); 1543 DI = 0; 1544 } else { 1545 ArgType = GetTypeFromParser(ArgInfo[i].Type, &DI); 1546 // Perform the default array/function conversions (C99 6.7.5.3p[7,8]). 1547 ArgType = adjustParameterType(ArgType); 1548 } 1549 1550 ParmVarDecl* Param 1551 = ParmVarDecl::Create(Context, ObjCMethod, ArgInfo[i].NameLoc, 1552 ArgInfo[i].Name, ArgType, DI, 1553 VarDecl::None, 0); 1554 1555 if (ArgType->isObjCInterfaceType()) { 1556 Diag(ArgInfo[i].NameLoc, 1557 diag::err_object_cannot_be_passed_returned_by_value) 1558 << 1 << ArgType; 1559 Param->setInvalidDecl(); 1560 } 1561 1562 Param->setObjCDeclQualifier( 1563 CvtQTToAstBitMask(ArgInfo[i].DeclSpec.getObjCDeclQualifier())); 1564 1565 // Apply the attributes to the parameter. 1566 ProcessDeclAttributeList(TUScope, Param, ArgInfo[i].ArgAttrs); 1567 1568 Params.push_back(Param); 1569 } 1570 1571 ObjCMethod->setMethodParams(Context, Params.data(), Sel.getNumArgs()); 1572 ObjCMethod->setObjCDeclQualifier( 1573 CvtQTToAstBitMask(ReturnQT.getObjCDeclQualifier())); 1574 const ObjCMethodDecl *PrevMethod = 0; 1575 1576 if (AttrList) 1577 ProcessDeclAttributeList(TUScope, ObjCMethod, AttrList); 1578 1579 const ObjCMethodDecl *InterfaceMD = 0; 1580 1581 // For implementations (which can be very "coarse grain"), we add the 1582 // method now. This allows the AST to implement lookup methods that work 1583 // incrementally (without waiting until we parse the @end). It also allows 1584 // us to flag multiple declaration errors as they occur. 1585 if (ObjCImplementationDecl *ImpDecl = 1586 dyn_cast<ObjCImplementationDecl>(ClassDecl)) { 1587 if (MethodType == tok::minus) { 1588 PrevMethod = ImpDecl->getInstanceMethod(Sel); 1589 ImpDecl->addInstanceMethod(ObjCMethod); 1590 } else { 1591 PrevMethod = ImpDecl->getClassMethod(Sel); 1592 ImpDecl->addClassMethod(ObjCMethod); 1593 } 1594 InterfaceMD = ImpDecl->getClassInterface()->getMethod(Sel, 1595 MethodType == tok::minus); 1596 if (AttrList) 1597 Diag(EndLoc, diag::warn_attribute_method_def); 1598 } else if (ObjCCategoryImplDecl *CatImpDecl = 1599 dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) { 1600 if (MethodType == tok::minus) { 1601 PrevMethod = CatImpDecl->getInstanceMethod(Sel); 1602 CatImpDecl->addInstanceMethod(ObjCMethod); 1603 } else { 1604 PrevMethod = CatImpDecl->getClassMethod(Sel); 1605 CatImpDecl->addClassMethod(ObjCMethod); 1606 } 1607 if (AttrList) 1608 Diag(EndLoc, diag::warn_attribute_method_def); 1609 } 1610 if (PrevMethod) { 1611 // You can never have two method definitions with the same name. 1612 Diag(ObjCMethod->getLocation(), diag::err_duplicate_method_decl) 1613 << ObjCMethod->getDeclName(); 1614 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 1615 } 1616 1617 // If the interface declared this method, and it was deprecated there, 1618 // mark it deprecated here. 1619 if (InterfaceMD && InterfaceMD->hasAttr<DeprecatedAttr>()) 1620 ObjCMethod->addAttr(::new (Context) DeprecatedAttr()); 1621 1622 return DeclPtrTy::make(ObjCMethod); 1623} 1624 1625bool Sema::CheckObjCDeclScope(Decl *D) { 1626 if (isa<TranslationUnitDecl>(CurContext->getLookupContext())) 1627 return false; 1628 1629 Diag(D->getLocation(), diag::err_objc_decls_may_only_appear_in_global_scope); 1630 D->setInvalidDecl(); 1631 1632 return true; 1633} 1634 1635/// Called whenever @defs(ClassName) is encountered in the source. Inserts the 1636/// instance variables of ClassName into Decls. 1637void Sema::ActOnDefs(Scope *S, DeclPtrTy TagD, SourceLocation DeclStart, 1638 IdentifierInfo *ClassName, 1639 llvm::SmallVectorImpl<DeclPtrTy> &Decls) { 1640 // Check that ClassName is a valid class 1641 ObjCInterfaceDecl *Class = getObjCInterfaceDecl(ClassName); 1642 if (!Class) { 1643 Diag(DeclStart, diag::err_undef_interface) << ClassName; 1644 return; 1645 } 1646 if (LangOpts.ObjCNonFragileABI) { 1647 Diag(DeclStart, diag::err_atdef_nonfragile_interface); 1648 return; 1649 } 1650 1651 // Collect the instance variables 1652 llvm::SmallVector<FieldDecl*, 32> RecFields; 1653 Context.CollectObjCIvars(Class, RecFields); 1654 // For each ivar, create a fresh ObjCAtDefsFieldDecl. 1655 for (unsigned i = 0; i < RecFields.size(); i++) { 1656 FieldDecl* ID = RecFields[i]; 1657 RecordDecl *Record = dyn_cast<RecordDecl>(TagD.getAs<Decl>()); 1658 Decl *FD = ObjCAtDefsFieldDecl::Create(Context, Record, ID->getLocation(), 1659 ID->getIdentifier(), ID->getType(), 1660 ID->getBitWidth()); 1661 Decls.push_back(Sema::DeclPtrTy::make(FD)); 1662 } 1663 1664 // Introduce all of these fields into the appropriate scope. 1665 for (llvm::SmallVectorImpl<DeclPtrTy>::iterator D = Decls.begin(); 1666 D != Decls.end(); ++D) { 1667 FieldDecl *FD = cast<FieldDecl>(D->getAs<Decl>()); 1668 if (getLangOptions().CPlusPlus) 1669 PushOnScopeChains(cast<FieldDecl>(FD), S); 1670 else if (RecordDecl *Record = dyn_cast<RecordDecl>(TagD.getAs<Decl>())) 1671 Record->addDecl(FD); 1672 } 1673} 1674 1675