SemaDeclObjC.cpp revision 1235b0ebb16618bf41a9e7234d5e2690faf97d37
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 27/// ActOnStartOfObjCMethodDef - This routine sets up parameters; invisible 28/// and user declared, in the method definition's AST. 29void Sema::ActOnStartOfObjCMethodDef(Scope *FnBodyScope, Decl *D) { 30 assert(getCurMethodDecl() == 0 && "Method parsing confused"); 31 ObjCMethodDecl *MDecl = dyn_cast_or_null<ObjCMethodDecl>(D); 32 33 // If we don't have a valid method decl, simply return. 34 if (!MDecl) 35 return; 36 37 // Allow the rest of sema to find private method decl implementations. 38 if (MDecl->isInstanceMethod()) 39 AddInstanceMethodToGlobalPool(MDecl, true); 40 else 41 AddFactoryMethodToGlobalPool(MDecl, true); 42 43 // Allow all of Sema to see that we are entering a method definition. 44 PushDeclContext(FnBodyScope, MDecl); 45 PushFunctionScope(); 46 47 // Create Decl objects for each parameter, entrring them in the scope for 48 // binding to their use. 49 50 // Insert the invisible arguments, self and _cmd! 51 MDecl->createImplicitParams(Context, MDecl->getClassInterface()); 52 53 PushOnScopeChains(MDecl->getSelfDecl(), FnBodyScope); 54 PushOnScopeChains(MDecl->getCmdDecl(), FnBodyScope); 55 56 // Introduce all of the other parameters into this scope. 57 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(), 58 E = MDecl->param_end(); PI != E; ++PI) { 59 ParmVarDecl *Param = (*PI); 60 if (!Param->isInvalidDecl() && 61 RequireCompleteType(Param->getLocation(), Param->getType(), 62 diag::err_typecheck_decl_incomplete_type)) 63 Param->setInvalidDecl(); 64 if ((*PI)->getIdentifier()) 65 PushOnScopeChains(*PI, FnBodyScope); 66 } 67} 68 69Decl *Sema:: 70ActOnStartClassInterface(SourceLocation AtInterfaceLoc, 71 IdentifierInfo *ClassName, SourceLocation ClassLoc, 72 IdentifierInfo *SuperName, SourceLocation SuperLoc, 73 Decl * const *ProtoRefs, unsigned NumProtoRefs, 74 const SourceLocation *ProtoLocs, 75 SourceLocation EndProtoLoc, AttributeList *AttrList) { 76 assert(ClassName && "Missing class identifier"); 77 78 // Check for another declaration kind with the same name. 79 NamedDecl *PrevDecl = LookupSingleName(TUScope, ClassName, ClassLoc, 80 LookupOrdinaryName, ForRedeclaration); 81 82 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 83 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName; 84 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 85 } 86 87 ObjCInterfaceDecl* IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 88 if (IDecl) { 89 // Class already seen. Is it a forward declaration? 90 if (!IDecl->isForwardDecl()) { 91 IDecl->setInvalidDecl(); 92 Diag(AtInterfaceLoc, diag::err_duplicate_class_def)<<IDecl->getDeclName(); 93 Diag(IDecl->getLocation(), diag::note_previous_definition); 94 95 // Return the previous class interface. 96 // FIXME: don't leak the objects passed in! 97 return IDecl; 98 } else { 99 IDecl->setLocation(AtInterfaceLoc); 100 IDecl->setForwardDecl(false); 101 IDecl->setClassLoc(ClassLoc); 102 // If the forward decl was in a PCH, we need to write it again in a 103 // dependent AST file. 104 IDecl->setChangedSinceDeserialization(true); 105 106 // Since this ObjCInterfaceDecl was created by a forward declaration, 107 // we now add it to the DeclContext since it wasn't added before 108 // (see ActOnForwardClassDeclaration). 109 IDecl->setLexicalDeclContext(CurContext); 110 CurContext->addDecl(IDecl); 111 112 if (AttrList) 113 ProcessDeclAttributeList(TUScope, IDecl, AttrList); 114 } 115 } else { 116 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtInterfaceLoc, 117 ClassName, ClassLoc); 118 if (AttrList) 119 ProcessDeclAttributeList(TUScope, IDecl, AttrList); 120 121 PushOnScopeChains(IDecl, TUScope); 122 } 123 124 if (SuperName) { 125 // Check if a different kind of symbol declared in this scope. 126 PrevDecl = LookupSingleName(TUScope, SuperName, SuperLoc, 127 LookupOrdinaryName); 128 129 if (!PrevDecl) { 130 // Try to correct for a typo in the superclass name. 131 LookupResult R(*this, SuperName, SuperLoc, LookupOrdinaryName); 132 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 133 (PrevDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 134 Diag(SuperLoc, diag::err_undef_superclass_suggest) 135 << SuperName << ClassName << PrevDecl->getDeclName(); 136 Diag(PrevDecl->getLocation(), diag::note_previous_decl) 137 << PrevDecl->getDeclName(); 138 } 139 } 140 141 if (PrevDecl == IDecl) { 142 Diag(SuperLoc, diag::err_recursive_superclass) 143 << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc); 144 IDecl->setLocEnd(ClassLoc); 145 } else { 146 ObjCInterfaceDecl *SuperClassDecl = 147 dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 148 149 // Diagnose classes that inherit from deprecated classes. 150 if (SuperClassDecl) 151 (void)DiagnoseUseOfDecl(SuperClassDecl, SuperLoc); 152 153 if (PrevDecl && SuperClassDecl == 0) { 154 // The previous declaration was not a class decl. Check if we have a 155 // typedef. If we do, get the underlying class type. 156 if (const TypedefDecl *TDecl = dyn_cast_or_null<TypedefDecl>(PrevDecl)) { 157 QualType T = TDecl->getUnderlyingType(); 158 if (T->isObjCObjectType()) { 159 if (NamedDecl *IDecl = T->getAs<ObjCObjectType>()->getInterface()) 160 SuperClassDecl = dyn_cast<ObjCInterfaceDecl>(IDecl); 161 } 162 } 163 164 // This handles the following case: 165 // 166 // typedef int SuperClass; 167 // @interface MyClass : SuperClass {} @end 168 // 169 if (!SuperClassDecl) { 170 Diag(SuperLoc, diag::err_redefinition_different_kind) << SuperName; 171 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 172 } 173 } 174 175 if (!dyn_cast_or_null<TypedefDecl>(PrevDecl)) { 176 if (!SuperClassDecl) 177 Diag(SuperLoc, diag::err_undef_superclass) 178 << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc); 179 else if (SuperClassDecl->isForwardDecl()) 180 Diag(SuperLoc, diag::err_undef_superclass) 181 << SuperClassDecl->getDeclName() << ClassName 182 << SourceRange(AtInterfaceLoc, ClassLoc); 183 } 184 IDecl->setSuperClass(SuperClassDecl); 185 IDecl->setSuperClassLoc(SuperLoc); 186 IDecl->setLocEnd(SuperLoc); 187 } 188 } else { // we have a root class. 189 IDecl->setLocEnd(ClassLoc); 190 } 191 192 // Check then save referenced protocols. 193 if (NumProtoRefs) { 194 IDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs, 195 ProtoLocs, Context); 196 IDecl->setLocEnd(EndProtoLoc); 197 } 198 199 CheckObjCDeclScope(IDecl); 200 return IDecl; 201} 202 203/// ActOnCompatiblityAlias - this action is called after complete parsing of 204/// @compatibility_alias declaration. It sets up the alias relationships. 205Decl *Sema::ActOnCompatiblityAlias(SourceLocation AtLoc, 206 IdentifierInfo *AliasName, 207 SourceLocation AliasLocation, 208 IdentifierInfo *ClassName, 209 SourceLocation ClassLocation) { 210 // Look for previous declaration of alias name 211 NamedDecl *ADecl = LookupSingleName(TUScope, AliasName, AliasLocation, 212 LookupOrdinaryName, ForRedeclaration); 213 if (ADecl) { 214 if (isa<ObjCCompatibleAliasDecl>(ADecl)) 215 Diag(AliasLocation, diag::warn_previous_alias_decl); 216 else 217 Diag(AliasLocation, diag::err_conflicting_aliasing_type) << AliasName; 218 Diag(ADecl->getLocation(), diag::note_previous_declaration); 219 return 0; 220 } 221 // Check for class declaration 222 NamedDecl *CDeclU = LookupSingleName(TUScope, ClassName, ClassLocation, 223 LookupOrdinaryName, ForRedeclaration); 224 if (const TypedefDecl *TDecl = dyn_cast_or_null<TypedefDecl>(CDeclU)) { 225 QualType T = TDecl->getUnderlyingType(); 226 if (T->isObjCObjectType()) { 227 if (NamedDecl *IDecl = T->getAs<ObjCObjectType>()->getInterface()) { 228 ClassName = IDecl->getIdentifier(); 229 CDeclU = LookupSingleName(TUScope, ClassName, ClassLocation, 230 LookupOrdinaryName, ForRedeclaration); 231 } 232 } 233 } 234 ObjCInterfaceDecl *CDecl = dyn_cast_or_null<ObjCInterfaceDecl>(CDeclU); 235 if (CDecl == 0) { 236 Diag(ClassLocation, diag::warn_undef_interface) << ClassName; 237 if (CDeclU) 238 Diag(CDeclU->getLocation(), diag::note_previous_declaration); 239 return 0; 240 } 241 242 // Everything checked out, instantiate a new alias declaration AST. 243 ObjCCompatibleAliasDecl *AliasDecl = 244 ObjCCompatibleAliasDecl::Create(Context, CurContext, AtLoc, AliasName, CDecl); 245 246 if (!CheckObjCDeclScope(AliasDecl)) 247 PushOnScopeChains(AliasDecl, TUScope); 248 249 return AliasDecl; 250} 251 252void Sema::CheckForwardProtocolDeclarationForCircularDependency( 253 IdentifierInfo *PName, 254 SourceLocation &Ploc, SourceLocation PrevLoc, 255 const ObjCList<ObjCProtocolDecl> &PList) { 256 for (ObjCList<ObjCProtocolDecl>::iterator I = PList.begin(), 257 E = PList.end(); I != E; ++I) { 258 259 if (ObjCProtocolDecl *PDecl = LookupProtocol((*I)->getIdentifier(), 260 Ploc)) { 261 if (PDecl->getIdentifier() == PName) { 262 Diag(Ploc, diag::err_protocol_has_circular_dependency); 263 Diag(PrevLoc, diag::note_previous_definition); 264 } 265 CheckForwardProtocolDeclarationForCircularDependency(PName, Ploc, 266 PDecl->getLocation(), PDecl->getReferencedProtocols()); 267 } 268 } 269} 270 271Decl * 272Sema::ActOnStartProtocolInterface(SourceLocation AtProtoInterfaceLoc, 273 IdentifierInfo *ProtocolName, 274 SourceLocation ProtocolLoc, 275 Decl * const *ProtoRefs, 276 unsigned NumProtoRefs, 277 const SourceLocation *ProtoLocs, 278 SourceLocation EndProtoLoc, 279 AttributeList *AttrList) { 280 // FIXME: Deal with AttrList. 281 assert(ProtocolName && "Missing protocol identifier"); 282 ObjCProtocolDecl *PDecl = LookupProtocol(ProtocolName, ProtocolLoc); 283 if (PDecl) { 284 // Protocol already seen. Better be a forward protocol declaration 285 if (!PDecl->isForwardDecl()) { 286 Diag(ProtocolLoc, diag::warn_duplicate_protocol_def) << ProtocolName; 287 Diag(PDecl->getLocation(), diag::note_previous_definition); 288 // Just return the protocol we already had. 289 // FIXME: don't leak the objects passed in! 290 return PDecl; 291 } 292 ObjCList<ObjCProtocolDecl> PList; 293 PList.set((ObjCProtocolDecl *const*)ProtoRefs, NumProtoRefs, Context); 294 CheckForwardProtocolDeclarationForCircularDependency( 295 ProtocolName, ProtocolLoc, PDecl->getLocation(), PList); 296 297 // Make sure the cached decl gets a valid start location. 298 PDecl->setLocation(AtProtoInterfaceLoc); 299 PDecl->setForwardDecl(false); 300 CurContext->addDecl(PDecl); 301 // Repeat in dependent AST files. 302 PDecl->setChangedSinceDeserialization(true); 303 } else { 304 PDecl = ObjCProtocolDecl::Create(Context, CurContext, 305 AtProtoInterfaceLoc,ProtocolName); 306 PushOnScopeChains(PDecl, TUScope); 307 PDecl->setForwardDecl(false); 308 } 309 if (AttrList) 310 ProcessDeclAttributeList(TUScope, PDecl, AttrList); 311 if (NumProtoRefs) { 312 /// Check then save referenced protocols. 313 PDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs, 314 ProtoLocs, Context); 315 PDecl->setLocEnd(EndProtoLoc); 316 } 317 318 CheckObjCDeclScope(PDecl); 319 return PDecl; 320} 321 322/// FindProtocolDeclaration - This routine looks up protocols and 323/// issues an error if they are not declared. It returns list of 324/// protocol declarations in its 'Protocols' argument. 325void 326Sema::FindProtocolDeclaration(bool WarnOnDeclarations, 327 const IdentifierLocPair *ProtocolId, 328 unsigned NumProtocols, 329 llvm::SmallVectorImpl<Decl *> &Protocols) { 330 for (unsigned i = 0; i != NumProtocols; ++i) { 331 ObjCProtocolDecl *PDecl = LookupProtocol(ProtocolId[i].first, 332 ProtocolId[i].second); 333 if (!PDecl) { 334 LookupResult R(*this, ProtocolId[i].first, ProtocolId[i].second, 335 LookupObjCProtocolName); 336 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 337 (PDecl = R.getAsSingle<ObjCProtocolDecl>())) { 338 Diag(ProtocolId[i].second, diag::err_undeclared_protocol_suggest) 339 << ProtocolId[i].first << R.getLookupName(); 340 Diag(PDecl->getLocation(), diag::note_previous_decl) 341 << PDecl->getDeclName(); 342 } 343 } 344 345 if (!PDecl) { 346 Diag(ProtocolId[i].second, diag::err_undeclared_protocol) 347 << ProtocolId[i].first; 348 continue; 349 } 350 351 (void)DiagnoseUseOfDecl(PDecl, ProtocolId[i].second); 352 353 // If this is a forward declaration and we are supposed to warn in this 354 // case, do it. 355 if (WarnOnDeclarations && PDecl->isForwardDecl()) 356 Diag(ProtocolId[i].second, diag::warn_undef_protocolref) 357 << ProtocolId[i].first; 358 Protocols.push_back(PDecl); 359 } 360} 361 362/// DiagnoseClassExtensionDupMethods - Check for duplicate declaration of 363/// a class method in its extension. 364/// 365void Sema::DiagnoseClassExtensionDupMethods(ObjCCategoryDecl *CAT, 366 ObjCInterfaceDecl *ID) { 367 if (!ID) 368 return; // Possibly due to previous error 369 370 llvm::DenseMap<Selector, const ObjCMethodDecl*> MethodMap; 371 for (ObjCInterfaceDecl::method_iterator i = ID->meth_begin(), 372 e = ID->meth_end(); i != e; ++i) { 373 ObjCMethodDecl *MD = *i; 374 MethodMap[MD->getSelector()] = MD; 375 } 376 377 if (MethodMap.empty()) 378 return; 379 for (ObjCCategoryDecl::method_iterator i = CAT->meth_begin(), 380 e = CAT->meth_end(); i != e; ++i) { 381 ObjCMethodDecl *Method = *i; 382 const ObjCMethodDecl *&PrevMethod = MethodMap[Method->getSelector()]; 383 if (PrevMethod && !MatchTwoMethodDeclarations(Method, PrevMethod)) { 384 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 385 << Method->getDeclName(); 386 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 387 } 388 } 389} 390 391/// ActOnForwardProtocolDeclaration - Handle @protocol foo; 392Decl * 393Sema::ActOnForwardProtocolDeclaration(SourceLocation AtProtocolLoc, 394 const IdentifierLocPair *IdentList, 395 unsigned NumElts, 396 AttributeList *attrList) { 397 llvm::SmallVector<ObjCProtocolDecl*, 32> Protocols; 398 llvm::SmallVector<SourceLocation, 8> ProtoLocs; 399 400 for (unsigned i = 0; i != NumElts; ++i) { 401 IdentifierInfo *Ident = IdentList[i].first; 402 ObjCProtocolDecl *PDecl = LookupProtocol(Ident, IdentList[i].second); 403 bool isNew = false; 404 if (PDecl == 0) { // Not already seen? 405 PDecl = ObjCProtocolDecl::Create(Context, CurContext, 406 IdentList[i].second, Ident); 407 PushOnScopeChains(PDecl, TUScope, false); 408 isNew = true; 409 } 410 if (attrList) { 411 ProcessDeclAttributeList(TUScope, PDecl, attrList); 412 if (!isNew) 413 PDecl->setChangedSinceDeserialization(true); 414 } 415 Protocols.push_back(PDecl); 416 ProtoLocs.push_back(IdentList[i].second); 417 } 418 419 ObjCForwardProtocolDecl *PDecl = 420 ObjCForwardProtocolDecl::Create(Context, CurContext, AtProtocolLoc, 421 Protocols.data(), Protocols.size(), 422 ProtoLocs.data()); 423 CurContext->addDecl(PDecl); 424 CheckObjCDeclScope(PDecl); 425 return PDecl; 426} 427 428Decl *Sema:: 429ActOnStartCategoryInterface(SourceLocation AtInterfaceLoc, 430 IdentifierInfo *ClassName, SourceLocation ClassLoc, 431 IdentifierInfo *CategoryName, 432 SourceLocation CategoryLoc, 433 Decl * const *ProtoRefs, 434 unsigned NumProtoRefs, 435 const SourceLocation *ProtoLocs, 436 SourceLocation EndProtoLoc) { 437 ObjCCategoryDecl *CDecl; 438 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true); 439 440 /// Check that class of this category is already completely declared. 441 if (!IDecl || IDecl->isForwardDecl()) { 442 // Create an invalid ObjCCategoryDecl to serve as context for 443 // the enclosing method declarations. We mark the decl invalid 444 // to make it clear that this isn't a valid AST. 445 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc, 446 ClassLoc, CategoryLoc, CategoryName); 447 CDecl->setInvalidDecl(); 448 Diag(ClassLoc, diag::err_undef_interface) << ClassName; 449 return CDecl; 450 } 451 452 if (!CategoryName && IDecl->getImplementation()) { 453 Diag(ClassLoc, diag::err_class_extension_after_impl) << ClassName; 454 Diag(IDecl->getImplementation()->getLocation(), 455 diag::note_implementation_declared); 456 } 457 458 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc, 459 ClassLoc, CategoryLoc, CategoryName); 460 // FIXME: PushOnScopeChains? 461 CurContext->addDecl(CDecl); 462 463 CDecl->setClassInterface(IDecl); 464 // Insert class extension to the list of class's categories. 465 if (!CategoryName) 466 CDecl->insertNextClassCategory(); 467 468 // If the interface is deprecated, warn about it. 469 (void)DiagnoseUseOfDecl(IDecl, ClassLoc); 470 471 if (CategoryName) { 472 /// Check for duplicate interface declaration for this category 473 ObjCCategoryDecl *CDeclChain; 474 for (CDeclChain = IDecl->getCategoryList(); CDeclChain; 475 CDeclChain = CDeclChain->getNextClassCategory()) { 476 if (CDeclChain->getIdentifier() == CategoryName) { 477 // Class extensions can be declared multiple times. 478 Diag(CategoryLoc, diag::warn_dup_category_def) 479 << ClassName << CategoryName; 480 Diag(CDeclChain->getLocation(), diag::note_previous_definition); 481 break; 482 } 483 } 484 if (!CDeclChain) 485 CDecl->insertNextClassCategory(); 486 } 487 488 if (NumProtoRefs) { 489 CDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs, 490 ProtoLocs, Context); 491 // Protocols in the class extension belong to the class. 492 if (CDecl->IsClassExtension()) 493 IDecl->mergeClassExtensionProtocolList((ObjCProtocolDecl**)ProtoRefs, 494 NumProtoRefs, Context); 495 } 496 497 CheckObjCDeclScope(CDecl); 498 return CDecl; 499} 500 501/// ActOnStartCategoryImplementation - Perform semantic checks on the 502/// category implementation declaration and build an ObjCCategoryImplDecl 503/// object. 504Decl *Sema::ActOnStartCategoryImplementation( 505 SourceLocation AtCatImplLoc, 506 IdentifierInfo *ClassName, SourceLocation ClassLoc, 507 IdentifierInfo *CatName, SourceLocation CatLoc) { 508 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true); 509 ObjCCategoryDecl *CatIDecl = 0; 510 if (IDecl) { 511 CatIDecl = IDecl->FindCategoryDeclaration(CatName); 512 if (!CatIDecl) { 513 // Category @implementation with no corresponding @interface. 514 // Create and install one. 515 CatIDecl = ObjCCategoryDecl::Create(Context, CurContext, SourceLocation(), 516 SourceLocation(), SourceLocation(), 517 CatName); 518 CatIDecl->setClassInterface(IDecl); 519 CatIDecl->insertNextClassCategory(); 520 } 521 } 522 523 ObjCCategoryImplDecl *CDecl = 524 ObjCCategoryImplDecl::Create(Context, CurContext, AtCatImplLoc, CatName, 525 IDecl); 526 /// Check that class of this category is already completely declared. 527 if (!IDecl || IDecl->isForwardDecl()) 528 Diag(ClassLoc, diag::err_undef_interface) << ClassName; 529 530 // FIXME: PushOnScopeChains? 531 CurContext->addDecl(CDecl); 532 533 /// Check that CatName, category name, is not used in another implementation. 534 if (CatIDecl) { 535 if (CatIDecl->getImplementation()) { 536 Diag(ClassLoc, diag::err_dup_implementation_category) << ClassName 537 << CatName; 538 Diag(CatIDecl->getImplementation()->getLocation(), 539 diag::note_previous_definition); 540 } else 541 CatIDecl->setImplementation(CDecl); 542 } 543 544 CheckObjCDeclScope(CDecl); 545 return CDecl; 546} 547 548Decl *Sema::ActOnStartClassImplementation( 549 SourceLocation AtClassImplLoc, 550 IdentifierInfo *ClassName, SourceLocation ClassLoc, 551 IdentifierInfo *SuperClassname, 552 SourceLocation SuperClassLoc) { 553 ObjCInterfaceDecl* IDecl = 0; 554 // Check for another declaration kind with the same name. 555 NamedDecl *PrevDecl 556 = LookupSingleName(TUScope, ClassName, ClassLoc, LookupOrdinaryName, 557 ForRedeclaration); 558 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 559 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName; 560 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 561 } else if ((IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl))) { 562 // If this is a forward declaration of an interface, warn. 563 if (IDecl->isForwardDecl()) { 564 Diag(ClassLoc, diag::warn_undef_interface) << ClassName; 565 IDecl = 0; 566 } 567 } else { 568 // We did not find anything with the name ClassName; try to correct for 569 // typos in the class name. 570 LookupResult R(*this, ClassName, ClassLoc, LookupOrdinaryName); 571 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 572 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 573 // Suggest the (potentially) correct interface name. However, put the 574 // fix-it hint itself in a separate note, since changing the name in 575 // the warning would make the fix-it change semantics.However, don't 576 // provide a code-modification hint or use the typo name for recovery, 577 // because this is just a warning. The program may actually be correct. 578 Diag(ClassLoc, diag::warn_undef_interface_suggest) 579 << ClassName << R.getLookupName(); 580 Diag(IDecl->getLocation(), diag::note_previous_decl) 581 << R.getLookupName() 582 << FixItHint::CreateReplacement(ClassLoc, 583 R.getLookupName().getAsString()); 584 IDecl = 0; 585 } else { 586 Diag(ClassLoc, diag::warn_undef_interface) << ClassName; 587 } 588 } 589 590 // Check that super class name is valid class name 591 ObjCInterfaceDecl* SDecl = 0; 592 if (SuperClassname) { 593 // Check if a different kind of symbol declared in this scope. 594 PrevDecl = LookupSingleName(TUScope, SuperClassname, SuperClassLoc, 595 LookupOrdinaryName); 596 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 597 Diag(SuperClassLoc, diag::err_redefinition_different_kind) 598 << SuperClassname; 599 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 600 } else { 601 SDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 602 if (!SDecl) 603 Diag(SuperClassLoc, diag::err_undef_superclass) 604 << SuperClassname << ClassName; 605 else if (IDecl && IDecl->getSuperClass() != SDecl) { 606 // This implementation and its interface do not have the same 607 // super class. 608 Diag(SuperClassLoc, diag::err_conflicting_super_class) 609 << SDecl->getDeclName(); 610 Diag(SDecl->getLocation(), diag::note_previous_definition); 611 } 612 } 613 } 614 615 if (!IDecl) { 616 // Legacy case of @implementation with no corresponding @interface. 617 // Build, chain & install the interface decl into the identifier. 618 619 // FIXME: Do we support attributes on the @implementation? If so we should 620 // copy them over. 621 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtClassImplLoc, 622 ClassName, ClassLoc, false, true); 623 IDecl->setSuperClass(SDecl); 624 IDecl->setLocEnd(ClassLoc); 625 626 PushOnScopeChains(IDecl, TUScope); 627 } else { 628 // Mark the interface as being completed, even if it was just as 629 // @class ....; 630 // declaration; the user cannot reopen it. 631 IDecl->setForwardDecl(false); 632 } 633 634 ObjCImplementationDecl* IMPDecl = 635 ObjCImplementationDecl::Create(Context, CurContext, AtClassImplLoc, 636 IDecl, SDecl); 637 638 if (CheckObjCDeclScope(IMPDecl)) 639 return IMPDecl; 640 641 // Check that there is no duplicate implementation of this class. 642 if (IDecl->getImplementation()) { 643 // FIXME: Don't leak everything! 644 Diag(ClassLoc, diag::err_dup_implementation_class) << ClassName; 645 Diag(IDecl->getImplementation()->getLocation(), 646 diag::note_previous_definition); 647 } else { // add it to the list. 648 IDecl->setImplementation(IMPDecl); 649 PushOnScopeChains(IMPDecl, TUScope); 650 } 651 return IMPDecl; 652} 653 654void Sema::CheckImplementationIvars(ObjCImplementationDecl *ImpDecl, 655 ObjCIvarDecl **ivars, unsigned numIvars, 656 SourceLocation RBrace) { 657 assert(ImpDecl && "missing implementation decl"); 658 ObjCInterfaceDecl* IDecl = ImpDecl->getClassInterface(); 659 if (!IDecl) 660 return; 661 /// Check case of non-existing @interface decl. 662 /// (legacy objective-c @implementation decl without an @interface decl). 663 /// Add implementations's ivar to the synthesize class's ivar list. 664 if (IDecl->isImplicitInterfaceDecl()) { 665 IDecl->setLocEnd(RBrace); 666 // Add ivar's to class's DeclContext. 667 for (unsigned i = 0, e = numIvars; i != e; ++i) { 668 ivars[i]->setLexicalDeclContext(ImpDecl); 669 IDecl->makeDeclVisibleInContext(ivars[i], false); 670 ImpDecl->addDecl(ivars[i]); 671 } 672 673 return; 674 } 675 // If implementation has empty ivar list, just return. 676 if (numIvars == 0) 677 return; 678 679 assert(ivars && "missing @implementation ivars"); 680 if (LangOpts.ObjCNonFragileABI2) { 681 if (ImpDecl->getSuperClass()) 682 Diag(ImpDecl->getLocation(), diag::warn_on_superclass_use); 683 for (unsigned i = 0; i < numIvars; i++) { 684 ObjCIvarDecl* ImplIvar = ivars[i]; 685 if (const ObjCIvarDecl *ClsIvar = 686 IDecl->getIvarDecl(ImplIvar->getIdentifier())) { 687 Diag(ImplIvar->getLocation(), diag::err_duplicate_ivar_declaration); 688 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 689 continue; 690 } 691 // Instance ivar to Implementation's DeclContext. 692 ImplIvar->setLexicalDeclContext(ImpDecl); 693 IDecl->makeDeclVisibleInContext(ImplIvar, false); 694 ImpDecl->addDecl(ImplIvar); 695 } 696 return; 697 } 698 // Check interface's Ivar list against those in the implementation. 699 // names and types must match. 700 // 701 unsigned j = 0; 702 ObjCInterfaceDecl::ivar_iterator 703 IVI = IDecl->ivar_begin(), IVE = IDecl->ivar_end(); 704 for (; numIvars > 0 && IVI != IVE; ++IVI) { 705 ObjCIvarDecl* ImplIvar = ivars[j++]; 706 ObjCIvarDecl* ClsIvar = *IVI; 707 assert (ImplIvar && "missing implementation ivar"); 708 assert (ClsIvar && "missing class ivar"); 709 710 // First, make sure the types match. 711 if (Context.getCanonicalType(ImplIvar->getType()) != 712 Context.getCanonicalType(ClsIvar->getType())) { 713 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_type) 714 << ImplIvar->getIdentifier() 715 << ImplIvar->getType() << ClsIvar->getType(); 716 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 717 } else if (ImplIvar->isBitField() && ClsIvar->isBitField()) { 718 Expr *ImplBitWidth = ImplIvar->getBitWidth(); 719 Expr *ClsBitWidth = ClsIvar->getBitWidth(); 720 if (ImplBitWidth->EvaluateAsInt(Context).getZExtValue() != 721 ClsBitWidth->EvaluateAsInt(Context).getZExtValue()) { 722 Diag(ImplBitWidth->getLocStart(), diag::err_conflicting_ivar_bitwidth) 723 << ImplIvar->getIdentifier(); 724 Diag(ClsBitWidth->getLocStart(), diag::note_previous_definition); 725 } 726 } 727 // Make sure the names are identical. 728 if (ImplIvar->getIdentifier() != ClsIvar->getIdentifier()) { 729 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_name) 730 << ImplIvar->getIdentifier() << ClsIvar->getIdentifier(); 731 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 732 } 733 --numIvars; 734 } 735 736 if (numIvars > 0) 737 Diag(ivars[j]->getLocation(), diag::err_inconsistant_ivar_count); 738 else if (IVI != IVE) 739 Diag((*IVI)->getLocation(), diag::err_inconsistant_ivar_count); 740} 741 742void Sema::WarnUndefinedMethod(SourceLocation ImpLoc, ObjCMethodDecl *method, 743 bool &IncompleteImpl, unsigned DiagID) { 744 if (!IncompleteImpl) { 745 Diag(ImpLoc, diag::warn_incomplete_impl); 746 IncompleteImpl = true; 747 } 748 Diag(method->getLocation(), DiagID) 749 << method->getDeclName(); 750} 751 752/// Determines if type B can be substituted for type A. Returns true if we can 753/// guarantee that anything that the user will do to an object of type A can 754/// also be done to an object of type B. This is trivially true if the two 755/// types are the same, or if B is a subclass of A. It becomes more complex 756/// in cases where protocols are involved. 757/// 758/// Object types in Objective-C describe the minimum requirements for an 759/// object, rather than providing a complete description of a type. For 760/// example, if A is a subclass of B, then B* may refer to an instance of A. 761/// The principle of substitutability means that we may use an instance of A 762/// anywhere that we may use an instance of B - it will implement all of the 763/// ivars of B and all of the methods of B. 764/// 765/// This substitutability is important when type checking methods, because 766/// the implementation may have stricter type definitions than the interface. 767/// The interface specifies minimum requirements, but the implementation may 768/// have more accurate ones. For example, a method may privately accept 769/// instances of B, but only publish that it accepts instances of A. Any 770/// object passed to it will be type checked against B, and so will implicitly 771/// by a valid A*. Similarly, a method may return a subclass of the class that 772/// it is declared as returning. 773/// 774/// This is most important when considering subclassing. A method in a 775/// subclass must accept any object as an argument that its superclass's 776/// implementation accepts. It may, however, accept a more general type 777/// without breaking substitutability (i.e. you can still use the subclass 778/// anywhere that you can use the superclass, but not vice versa). The 779/// converse requirement applies to return types: the return type for a 780/// subclass method must be a valid object of the kind that the superclass 781/// advertises, but it may be specified more accurately. This avoids the need 782/// for explicit down-casting by callers. 783/// 784/// Note: This is a stricter requirement than for assignment. 785static bool isObjCTypeSubstitutable(ASTContext &C, QualType A, QualType B, bool 786 rejectId=false) { 787 ObjCObjectPointerType *a = dyn_cast<ObjCObjectPointerType>( 788 C.getCanonicalType(A)); 789 ObjCObjectPointerType *b = dyn_cast<ObjCObjectPointerType>( 790 C.getCanonicalType(B)); 791 // Ignore non-ObjC types. 792 if (!(a && b)) 793 { 794 //a->dump(); b->dump(); 795 return false; 796 } 797 // A type is always substitutable for itself 798 if (C.hasSameType(A, B)) return true; 799 800 if (rejectId && C.isObjCIdType(B)) return false; 801 802 // If B is a qualified id, then A must also be a qualified id and it must 803 // implement all of the protocols in B. It may not be a qualified class. 804 // For example, MyClass<A> can be assigned to id<A>, but MyClass<A> is a 805 // stricter definition so it is not substitutable for id<A>. 806 if (B->isObjCQualifiedIdType()) { 807 return A->isObjCQualifiedIdType() && 808 C.ObjCQualifiedIdTypesAreCompatible(A, B, false); 809 } 810 811 /* 812 // id is a special type that bypasses type checking completely. We want a 813 // warning when it is used in one place but not another. 814 if (C.isObjCIdType(A) || C.isObjCIdType(B)) return false; 815 816 817 // If B is a qualified id, then A must also be a qualified id (which it isn't 818 // if we've got this far) 819 if (B->isObjCQualifiedIdType()) return false; 820 */ 821 822 // Now we know that A and B are (potentially-qualified) class types. The 823 // normal rules for assignment apply. 824 return C.canAssignObjCInterfaces(a, b); 825} 826 827void Sema::WarnConflictingTypedMethods(ObjCMethodDecl *ImpMethodDecl, 828 ObjCMethodDecl *IntfMethodDecl) { 829 if (!Context.hasSameType(IntfMethodDecl->getResultType(), 830 ImpMethodDecl->getResultType())) { 831 // Allow non-matching return types as long as they don't violate the 832 // principle of substitutability. Specifically, we permit return types 833 // that are subclasses of the declared return type, or that are 834 // more-qualified versions of the declared type. 835 836 // As a possibly-temporary adjustment, we still warn in the 837 // covariant case, just with a different diagnostic (mapped to 838 // nothing under certain circumstances). 839 unsigned DiagID = diag::warn_conflicting_ret_types; 840 if (isObjCTypeSubstitutable(Context, IntfMethodDecl->getResultType(), 841 ImpMethodDecl->getResultType())) 842 DiagID = diag::warn_covariant_ret_types; 843 844 Diag(ImpMethodDecl->getLocation(), DiagID) 845 << ImpMethodDecl->getDeclName() << IntfMethodDecl->getResultType() 846 << ImpMethodDecl->getResultType(); 847 Diag(IntfMethodDecl->getLocation(), diag::note_previous_definition); 848 } 849 850 for (ObjCMethodDecl::param_iterator IM = ImpMethodDecl->param_begin(), 851 IF = IntfMethodDecl->param_begin(), EM = ImpMethodDecl->param_end(); 852 IM != EM; ++IM, ++IF) { 853 QualType ParmDeclTy = (*IF)->getType().getUnqualifiedType(); 854 QualType ParmImpTy = (*IM)->getType().getUnqualifiedType(); 855 if (Context.hasSameType(ParmDeclTy, ParmImpTy)) 856 continue; 857 858 // Allow non-matching argument types as long as they don't violate the 859 // principle of substitutability. Specifically, the implementation must 860 // accept any objects that the superclass accepts, however it may also 861 // accept others. 862 863 // As a possibly-temporary adjustment, we still warn in the 864 // contravariant case, just with a different diagnostic (mapped to 865 // nothing under certain circumstances). 866 unsigned DiagID = diag::warn_conflicting_param_types; 867 if (isObjCTypeSubstitutable(Context, ParmImpTy, ParmDeclTy, true)) 868 DiagID = diag::warn_contravariant_param_types; 869 870 Diag((*IM)->getLocation(), DiagID) 871 << ImpMethodDecl->getDeclName() << (*IF)->getType() 872 << (*IM)->getType(); 873 Diag((*IF)->getLocation(), diag::note_previous_definition); 874 } 875 if (ImpMethodDecl->isVariadic() != IntfMethodDecl->isVariadic()) { 876 Diag(ImpMethodDecl->getLocation(), diag::warn_conflicting_variadic); 877 Diag(IntfMethodDecl->getLocation(), diag::note_previous_declaration); 878 } 879} 880 881/// FIXME: Type hierarchies in Objective-C can be deep. We could most likely 882/// improve the efficiency of selector lookups and type checking by associating 883/// with each protocol / interface / category the flattened instance tables. If 884/// we used an immutable set to keep the table then it wouldn't add significant 885/// memory cost and it would be handy for lookups. 886 887/// CheckProtocolMethodDefs - This routine checks unimplemented methods 888/// Declared in protocol, and those referenced by it. 889void Sema::CheckProtocolMethodDefs(SourceLocation ImpLoc, 890 ObjCProtocolDecl *PDecl, 891 bool& IncompleteImpl, 892 const llvm::DenseSet<Selector> &InsMap, 893 const llvm::DenseSet<Selector> &ClsMap, 894 ObjCContainerDecl *CDecl) { 895 ObjCInterfaceDecl *IDecl; 896 if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl)) 897 IDecl = C->getClassInterface(); 898 else 899 IDecl = dyn_cast<ObjCInterfaceDecl>(CDecl); 900 assert (IDecl && "CheckProtocolMethodDefs - IDecl is null"); 901 902 ObjCInterfaceDecl *Super = IDecl->getSuperClass(); 903 ObjCInterfaceDecl *NSIDecl = 0; 904 if (getLangOptions().NeXTRuntime) { 905 // check to see if class implements forwardInvocation method and objects 906 // of this class are derived from 'NSProxy' so that to forward requests 907 // from one object to another. 908 // Under such conditions, which means that every method possible is 909 // implemented in the class, we should not issue "Method definition not 910 // found" warnings. 911 // FIXME: Use a general GetUnarySelector method for this. 912 IdentifierInfo* II = &Context.Idents.get("forwardInvocation"); 913 Selector fISelector = Context.Selectors.getSelector(1, &II); 914 if (InsMap.count(fISelector)) 915 // Is IDecl derived from 'NSProxy'? If so, no instance methods 916 // need be implemented in the implementation. 917 NSIDecl = IDecl->lookupInheritedClass(&Context.Idents.get("NSProxy")); 918 } 919 920 // If a method lookup fails locally we still need to look and see if 921 // the method was implemented by a base class or an inherited 922 // protocol. This lookup is slow, but occurs rarely in correct code 923 // and otherwise would terminate in a warning. 924 925 // check unimplemented instance methods. 926 if (!NSIDecl) 927 for (ObjCProtocolDecl::instmeth_iterator I = PDecl->instmeth_begin(), 928 E = PDecl->instmeth_end(); I != E; ++I) { 929 ObjCMethodDecl *method = *I; 930 if (method->getImplementationControl() != ObjCMethodDecl::Optional && 931 !method->isSynthesized() && !InsMap.count(method->getSelector()) && 932 (!Super || 933 !Super->lookupInstanceMethod(method->getSelector()))) { 934 // Ugly, but necessary. Method declared in protcol might have 935 // have been synthesized due to a property declared in the class which 936 // uses the protocol. 937 ObjCMethodDecl *MethodInClass = 938 IDecl->lookupInstanceMethod(method->getSelector()); 939 if (!MethodInClass || !MethodInClass->isSynthesized()) { 940 unsigned DIAG = diag::warn_unimplemented_protocol_method; 941 if (Diags.getDiagnosticLevel(DIAG) != Diagnostic::Ignored) { 942 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG); 943 Diag(CDecl->getLocation(), diag::note_required_for_protocol_at) 944 << PDecl->getDeclName(); 945 } 946 } 947 } 948 } 949 // check unimplemented class methods 950 for (ObjCProtocolDecl::classmeth_iterator 951 I = PDecl->classmeth_begin(), E = PDecl->classmeth_end(); 952 I != E; ++I) { 953 ObjCMethodDecl *method = *I; 954 if (method->getImplementationControl() != ObjCMethodDecl::Optional && 955 !ClsMap.count(method->getSelector()) && 956 (!Super || !Super->lookupClassMethod(method->getSelector()))) { 957 unsigned DIAG = diag::warn_unimplemented_protocol_method; 958 if (Diags.getDiagnosticLevel(DIAG) != Diagnostic::Ignored) { 959 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG); 960 Diag(IDecl->getLocation(), diag::note_required_for_protocol_at) << 961 PDecl->getDeclName(); 962 } 963 } 964 } 965 // Check on this protocols's referenced protocols, recursively. 966 for (ObjCProtocolDecl::protocol_iterator PI = PDecl->protocol_begin(), 967 E = PDecl->protocol_end(); PI != E; ++PI) 968 CheckProtocolMethodDefs(ImpLoc, *PI, IncompleteImpl, InsMap, ClsMap, IDecl); 969} 970 971/// MatchAllMethodDeclarations - Check methods declaraed in interface or 972/// or protocol against those declared in their implementations. 973/// 974void Sema::MatchAllMethodDeclarations(const llvm::DenseSet<Selector> &InsMap, 975 const llvm::DenseSet<Selector> &ClsMap, 976 llvm::DenseSet<Selector> &InsMapSeen, 977 llvm::DenseSet<Selector> &ClsMapSeen, 978 ObjCImplDecl* IMPDecl, 979 ObjCContainerDecl* CDecl, 980 bool &IncompleteImpl, 981 bool ImmediateClass) { 982 // Check and see if instance methods in class interface have been 983 // implemented in the implementation class. If so, their types match. 984 for (ObjCInterfaceDecl::instmeth_iterator I = CDecl->instmeth_begin(), 985 E = CDecl->instmeth_end(); I != E; ++I) { 986 if (InsMapSeen.count((*I)->getSelector())) 987 continue; 988 InsMapSeen.insert((*I)->getSelector()); 989 if (!(*I)->isSynthesized() && 990 !InsMap.count((*I)->getSelector())) { 991 if (ImmediateClass) 992 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl, 993 diag::note_undef_method_impl); 994 continue; 995 } else { 996 ObjCMethodDecl *ImpMethodDecl = 997 IMPDecl->getInstanceMethod((*I)->getSelector()); 998 ObjCMethodDecl *IntfMethodDecl = 999 CDecl->getInstanceMethod((*I)->getSelector()); 1000 assert(IntfMethodDecl && 1001 "IntfMethodDecl is null in ImplMethodsVsClassMethods"); 1002 // ImpMethodDecl may be null as in a @dynamic property. 1003 if (ImpMethodDecl) 1004 WarnConflictingTypedMethods(ImpMethodDecl, IntfMethodDecl); 1005 } 1006 } 1007 1008 // Check and see if class methods in class interface have been 1009 // implemented in the implementation class. If so, their types match. 1010 for (ObjCInterfaceDecl::classmeth_iterator 1011 I = CDecl->classmeth_begin(), E = CDecl->classmeth_end(); I != E; ++I) { 1012 if (ClsMapSeen.count((*I)->getSelector())) 1013 continue; 1014 ClsMapSeen.insert((*I)->getSelector()); 1015 if (!ClsMap.count((*I)->getSelector())) { 1016 if (ImmediateClass) 1017 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl, 1018 diag::note_undef_method_impl); 1019 } else { 1020 ObjCMethodDecl *ImpMethodDecl = 1021 IMPDecl->getClassMethod((*I)->getSelector()); 1022 ObjCMethodDecl *IntfMethodDecl = 1023 CDecl->getClassMethod((*I)->getSelector()); 1024 WarnConflictingTypedMethods(ImpMethodDecl, IntfMethodDecl); 1025 } 1026 } 1027 1028 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) { 1029 // Also methods in class extensions need be looked at next. 1030 for (const ObjCCategoryDecl *ClsExtDecl = I->getFirstClassExtension(); 1031 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) 1032 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1033 IMPDecl, 1034 const_cast<ObjCCategoryDecl *>(ClsExtDecl), 1035 IncompleteImpl, false); 1036 1037 // Check for any implementation of a methods declared in protocol. 1038 for (ObjCInterfaceDecl::all_protocol_iterator 1039 PI = I->all_referenced_protocol_begin(), 1040 E = I->all_referenced_protocol_end(); PI != E; ++PI) 1041 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1042 IMPDecl, 1043 (*PI), IncompleteImpl, false); 1044 if (I->getSuperClass()) 1045 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1046 IMPDecl, 1047 I->getSuperClass(), IncompleteImpl, false); 1048 } 1049} 1050 1051void Sema::ImplMethodsVsClassMethods(Scope *S, ObjCImplDecl* IMPDecl, 1052 ObjCContainerDecl* CDecl, 1053 bool IncompleteImpl) { 1054 llvm::DenseSet<Selector> InsMap; 1055 // Check and see if instance methods in class interface have been 1056 // implemented in the implementation class. 1057 for (ObjCImplementationDecl::instmeth_iterator 1058 I = IMPDecl->instmeth_begin(), E = IMPDecl->instmeth_end(); I!=E; ++I) 1059 InsMap.insert((*I)->getSelector()); 1060 1061 // Check and see if properties declared in the interface have either 1) 1062 // an implementation or 2) there is a @synthesize/@dynamic implementation 1063 // of the property in the @implementation. 1064 if (isa<ObjCInterfaceDecl>(CDecl) && !LangOpts.ObjCNonFragileABI2) 1065 DiagnoseUnimplementedProperties(S, IMPDecl, CDecl, InsMap); 1066 1067 llvm::DenseSet<Selector> ClsMap; 1068 for (ObjCImplementationDecl::classmeth_iterator 1069 I = IMPDecl->classmeth_begin(), 1070 E = IMPDecl->classmeth_end(); I != E; ++I) 1071 ClsMap.insert((*I)->getSelector()); 1072 1073 // Check for type conflict of methods declared in a class/protocol and 1074 // its implementation; if any. 1075 llvm::DenseSet<Selector> InsMapSeen, ClsMapSeen; 1076 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1077 IMPDecl, CDecl, 1078 IncompleteImpl, true); 1079 1080 // Check the protocol list for unimplemented methods in the @implementation 1081 // class. 1082 // Check and see if class methods in class interface have been 1083 // implemented in the implementation class. 1084 1085 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) { 1086 for (ObjCInterfaceDecl::all_protocol_iterator 1087 PI = I->all_referenced_protocol_begin(), 1088 E = I->all_referenced_protocol_end(); PI != E; ++PI) 1089 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl, 1090 InsMap, ClsMap, I); 1091 // Check class extensions (unnamed categories) 1092 for (const ObjCCategoryDecl *Categories = I->getFirstClassExtension(); 1093 Categories; Categories = Categories->getNextClassExtension()) 1094 ImplMethodsVsClassMethods(S, IMPDecl, 1095 const_cast<ObjCCategoryDecl*>(Categories), 1096 IncompleteImpl); 1097 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl)) { 1098 // For extended class, unimplemented methods in its protocols will 1099 // be reported in the primary class. 1100 if (!C->IsClassExtension()) { 1101 for (ObjCCategoryDecl::protocol_iterator PI = C->protocol_begin(), 1102 E = C->protocol_end(); PI != E; ++PI) 1103 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl, 1104 InsMap, ClsMap, CDecl); 1105 // Report unimplemented properties in the category as well. 1106 // When reporting on missing setter/getters, do not report when 1107 // setter/getter is implemented in category's primary class 1108 // implementation. 1109 if (ObjCInterfaceDecl *ID = C->getClassInterface()) 1110 if (ObjCImplDecl *IMP = ID->getImplementation()) { 1111 for (ObjCImplementationDecl::instmeth_iterator 1112 I = IMP->instmeth_begin(), E = IMP->instmeth_end(); I!=E; ++I) 1113 InsMap.insert((*I)->getSelector()); 1114 } 1115 DiagnoseUnimplementedProperties(S, IMPDecl, CDecl, InsMap); 1116 } 1117 } else 1118 assert(false && "invalid ObjCContainerDecl type."); 1119} 1120 1121/// ActOnForwardClassDeclaration - 1122Decl * 1123Sema::ActOnForwardClassDeclaration(SourceLocation AtClassLoc, 1124 IdentifierInfo **IdentList, 1125 SourceLocation *IdentLocs, 1126 unsigned NumElts) { 1127 llvm::SmallVector<ObjCInterfaceDecl*, 32> Interfaces; 1128 1129 for (unsigned i = 0; i != NumElts; ++i) { 1130 // Check for another declaration kind with the same name. 1131 NamedDecl *PrevDecl 1132 = LookupSingleName(TUScope, IdentList[i], IdentLocs[i], 1133 LookupOrdinaryName, ForRedeclaration); 1134 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1135 // Maybe we will complain about the shadowed template parameter. 1136 DiagnoseTemplateParameterShadow(AtClassLoc, PrevDecl); 1137 // Just pretend that we didn't see the previous declaration. 1138 PrevDecl = 0; 1139 } 1140 1141 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 1142 // GCC apparently allows the following idiom: 1143 // 1144 // typedef NSObject < XCElementTogglerP > XCElementToggler; 1145 // @class XCElementToggler; 1146 // 1147 // FIXME: Make an extension? 1148 TypedefDecl *TDD = dyn_cast<TypedefDecl>(PrevDecl); 1149 if (!TDD || !TDD->getUnderlyingType()->isObjCObjectType()) { 1150 Diag(AtClassLoc, diag::err_redefinition_different_kind) << IdentList[i]; 1151 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1152 } else { 1153 // a forward class declaration matching a typedef name of a class refers 1154 // to the underlying class. 1155 if (const ObjCObjectType *OI = 1156 TDD->getUnderlyingType()->getAs<ObjCObjectType>()) 1157 PrevDecl = OI->getInterface(); 1158 } 1159 } 1160 ObjCInterfaceDecl *IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 1161 if (!IDecl) { // Not already seen? Make a forward decl. 1162 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtClassLoc, 1163 IdentList[i], IdentLocs[i], true); 1164 1165 // Push the ObjCInterfaceDecl on the scope chain but do *not* add it to 1166 // the current DeclContext. This prevents clients that walk DeclContext 1167 // from seeing the imaginary ObjCInterfaceDecl until it is actually 1168 // declared later (if at all). We also take care to explicitly make 1169 // sure this declaration is visible for name lookup. 1170 PushOnScopeChains(IDecl, TUScope, false); 1171 CurContext->makeDeclVisibleInContext(IDecl, true); 1172 } 1173 1174 Interfaces.push_back(IDecl); 1175 } 1176 1177 assert(Interfaces.size() == NumElts); 1178 ObjCClassDecl *CDecl = ObjCClassDecl::Create(Context, CurContext, AtClassLoc, 1179 Interfaces.data(), IdentLocs, 1180 Interfaces.size()); 1181 CurContext->addDecl(CDecl); 1182 CheckObjCDeclScope(CDecl); 1183 return CDecl; 1184} 1185 1186 1187/// MatchTwoMethodDeclarations - Checks that two methods have matching type and 1188/// returns true, or false, accordingly. 1189/// TODO: Handle protocol list; such as id<p1,p2> in type comparisons 1190bool Sema::MatchTwoMethodDeclarations(const ObjCMethodDecl *Method, 1191 const ObjCMethodDecl *PrevMethod, 1192 bool matchBasedOnSizeAndAlignment, 1193 bool matchBasedOnStrictEqulity) { 1194 QualType T1 = Context.getCanonicalType(Method->getResultType()); 1195 QualType T2 = Context.getCanonicalType(PrevMethod->getResultType()); 1196 1197 if (T1 != T2) { 1198 // The result types are different. 1199 if (!matchBasedOnSizeAndAlignment || matchBasedOnStrictEqulity) 1200 return false; 1201 // Incomplete types don't have a size and alignment. 1202 if (T1->isIncompleteType() || T2->isIncompleteType()) 1203 return false; 1204 // Check is based on size and alignment. 1205 if (Context.getTypeInfo(T1) != Context.getTypeInfo(T2)) 1206 return false; 1207 } 1208 1209 ObjCMethodDecl::param_iterator ParamI = Method->param_begin(), 1210 E = Method->param_end(); 1211 ObjCMethodDecl::param_iterator PrevI = PrevMethod->param_begin(); 1212 1213 for (; ParamI != E; ++ParamI, ++PrevI) { 1214 assert(PrevI != PrevMethod->param_end() && "Param mismatch"); 1215 T1 = Context.getCanonicalType((*ParamI)->getType()); 1216 T2 = Context.getCanonicalType((*PrevI)->getType()); 1217 if (T1 != T2) { 1218 // The result types are different. 1219 if (!matchBasedOnSizeAndAlignment || matchBasedOnStrictEqulity) 1220 return false; 1221 // Incomplete types don't have a size and alignment. 1222 if (T1->isIncompleteType() || T2->isIncompleteType()) 1223 return false; 1224 // Check is based on size and alignment. 1225 if (Context.getTypeInfo(T1) != Context.getTypeInfo(T2)) 1226 return false; 1227 } 1228 } 1229 return true; 1230} 1231 1232/// \brief Read the contents of the method pool for a given selector from 1233/// external storage. 1234/// 1235/// This routine should only be called once, when the method pool has no entry 1236/// for this selector. 1237Sema::GlobalMethodPool::iterator Sema::ReadMethodPool(Selector Sel) { 1238 assert(ExternalSource && "We need an external AST source"); 1239 assert(MethodPool.find(Sel) == MethodPool.end() && 1240 "Selector data already loaded into the method pool"); 1241 1242 // Read the method list from the external source. 1243 GlobalMethods Methods = ExternalSource->ReadMethodPool(Sel); 1244 1245 return MethodPool.insert(std::make_pair(Sel, Methods)).first; 1246} 1247 1248void Sema::AddMethodToGlobalPool(ObjCMethodDecl *Method, bool impl, 1249 bool instance) { 1250 GlobalMethodPool::iterator Pos = MethodPool.find(Method->getSelector()); 1251 if (Pos == MethodPool.end()) { 1252 if (ExternalSource) 1253 Pos = ReadMethodPool(Method->getSelector()); 1254 else 1255 Pos = MethodPool.insert(std::make_pair(Method->getSelector(), 1256 GlobalMethods())).first; 1257 } 1258 Method->setDefined(impl); 1259 ObjCMethodList &Entry = instance ? Pos->second.first : Pos->second.second; 1260 if (Entry.Method == 0) { 1261 // Haven't seen a method with this selector name yet - add it. 1262 Entry.Method = Method; 1263 Entry.Next = 0; 1264 return; 1265 } 1266 1267 // We've seen a method with this name, see if we have already seen this type 1268 // signature. 1269 for (ObjCMethodList *List = &Entry; List; List = List->Next) 1270 if (MatchTwoMethodDeclarations(Method, List->Method)) { 1271 List->Method->setDefined(impl); 1272 return; 1273 } 1274 1275 // We have a new signature for an existing method - add it. 1276 // This is extremely rare. Only 1% of Cocoa selectors are "overloaded". 1277 ObjCMethodList *Mem = BumpAlloc.Allocate<ObjCMethodList>(); 1278 Entry.Next = new (Mem) ObjCMethodList(Method, Entry.Next); 1279} 1280 1281ObjCMethodDecl *Sema::LookupMethodInGlobalPool(Selector Sel, SourceRange R, 1282 bool receiverIdOrClass, 1283 bool warn, bool instance) { 1284 GlobalMethodPool::iterator Pos = MethodPool.find(Sel); 1285 if (Pos == MethodPool.end()) { 1286 if (ExternalSource) 1287 Pos = ReadMethodPool(Sel); 1288 else 1289 return 0; 1290 } 1291 1292 ObjCMethodList &MethList = instance ? Pos->second.first : Pos->second.second; 1293 1294 bool strictSelectorMatch = receiverIdOrClass && warn && 1295 (Diags.getDiagnosticLevel(diag::warn_strict_multiple_method_decl) != 1296 Diagnostic::Ignored); 1297 if (warn && MethList.Method && MethList.Next) { 1298 bool issueWarning = false; 1299 if (strictSelectorMatch) 1300 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) { 1301 // This checks if the methods differ in type mismatch. 1302 if (!MatchTwoMethodDeclarations(MethList.Method, Next->Method, false, true)) 1303 issueWarning = true; 1304 } 1305 1306 if (!issueWarning) 1307 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) { 1308 // This checks if the methods differ by size & alignment. 1309 if (!MatchTwoMethodDeclarations(MethList.Method, Next->Method, true)) 1310 issueWarning = true; 1311 } 1312 1313 if (issueWarning) { 1314 if (strictSelectorMatch) 1315 Diag(R.getBegin(), diag::warn_strict_multiple_method_decl) << Sel << R; 1316 else 1317 Diag(R.getBegin(), diag::warn_multiple_method_decl) << Sel << R; 1318 Diag(MethList.Method->getLocStart(), diag::note_using) 1319 << MethList.Method->getSourceRange(); 1320 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) 1321 Diag(Next->Method->getLocStart(), diag::note_also_found) 1322 << Next->Method->getSourceRange(); 1323 } 1324 } 1325 return MethList.Method; 1326} 1327 1328ObjCMethodDecl *Sema::LookupImplementedMethodInGlobalPool(Selector Sel) { 1329 GlobalMethodPool::iterator Pos = MethodPool.find(Sel); 1330 if (Pos == MethodPool.end()) 1331 return 0; 1332 1333 GlobalMethods &Methods = Pos->second; 1334 1335 if (Methods.first.Method && Methods.first.Method->isDefined()) 1336 return Methods.first.Method; 1337 if (Methods.second.Method && Methods.second.Method->isDefined()) 1338 return Methods.second.Method; 1339 return 0; 1340} 1341 1342/// CompareMethodParamsInBaseAndSuper - This routine compares methods with 1343/// identical selector names in current and its super classes and issues 1344/// a warning if any of their argument types are incompatible. 1345void Sema::CompareMethodParamsInBaseAndSuper(Decl *ClassDecl, 1346 ObjCMethodDecl *Method, 1347 bool IsInstance) { 1348 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(ClassDecl); 1349 if (ID == 0) return; 1350 1351 while (ObjCInterfaceDecl *SD = ID->getSuperClass()) { 1352 ObjCMethodDecl *SuperMethodDecl = 1353 SD->lookupMethod(Method->getSelector(), IsInstance); 1354 if (SuperMethodDecl == 0) { 1355 ID = SD; 1356 continue; 1357 } 1358 ObjCMethodDecl::param_iterator ParamI = Method->param_begin(), 1359 E = Method->param_end(); 1360 ObjCMethodDecl::param_iterator PrevI = SuperMethodDecl->param_begin(); 1361 for (; ParamI != E; ++ParamI, ++PrevI) { 1362 // Number of parameters are the same and is guaranteed by selector match. 1363 assert(PrevI != SuperMethodDecl->param_end() && "Param mismatch"); 1364 QualType T1 = Context.getCanonicalType((*ParamI)->getType()); 1365 QualType T2 = Context.getCanonicalType((*PrevI)->getType()); 1366 // If type of arguement of method in this class does not match its 1367 // respective argument type in the super class method, issue warning; 1368 if (!Context.typesAreCompatible(T1, T2)) { 1369 Diag((*ParamI)->getLocation(), diag::ext_typecheck_base_super) 1370 << T1 << T2; 1371 Diag(SuperMethodDecl->getLocation(), diag::note_previous_declaration); 1372 return; 1373 } 1374 } 1375 ID = SD; 1376 } 1377} 1378 1379/// DiagnoseDuplicateIvars - 1380/// Check for duplicate ivars in the entire class at the start of 1381/// @implementation. This becomes necesssary because class extension can 1382/// add ivars to a class in random order which will not be known until 1383/// class's @implementation is seen. 1384void Sema::DiagnoseDuplicateIvars(ObjCInterfaceDecl *ID, 1385 ObjCInterfaceDecl *SID) { 1386 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 1387 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 1388 ObjCIvarDecl* Ivar = (*IVI); 1389 if (Ivar->isInvalidDecl()) 1390 continue; 1391 if (IdentifierInfo *II = Ivar->getIdentifier()) { 1392 ObjCIvarDecl* prevIvar = SID->lookupInstanceVariable(II); 1393 if (prevIvar) { 1394 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 1395 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 1396 Ivar->setInvalidDecl(); 1397 } 1398 } 1399 } 1400} 1401 1402// Note: For class/category implemenations, allMethods/allProperties is 1403// always null. 1404void Sema::ActOnAtEnd(Scope *S, SourceRange AtEnd, 1405 Decl *ClassDecl, 1406 Decl **allMethods, unsigned allNum, 1407 Decl **allProperties, unsigned pNum, 1408 DeclGroupPtrTy *allTUVars, unsigned tuvNum) { 1409 // FIXME: If we don't have a ClassDecl, we have an error. We should consider 1410 // always passing in a decl. If the decl has an error, isInvalidDecl() 1411 // should be true. 1412 if (!ClassDecl) 1413 return; 1414 1415 bool isInterfaceDeclKind = 1416 isa<ObjCInterfaceDecl>(ClassDecl) || isa<ObjCCategoryDecl>(ClassDecl) 1417 || isa<ObjCProtocolDecl>(ClassDecl); 1418 bool checkIdenticalMethods = isa<ObjCImplementationDecl>(ClassDecl); 1419 1420 if (!isInterfaceDeclKind && AtEnd.isInvalid()) { 1421 // FIXME: This is wrong. We shouldn't be pretending that there is 1422 // an '@end' in the declaration. 1423 SourceLocation L = ClassDecl->getLocation(); 1424 AtEnd.setBegin(L); 1425 AtEnd.setEnd(L); 1426 Diag(L, diag::warn_missing_atend); 1427 } 1428 1429 DeclContext *DC = dyn_cast<DeclContext>(ClassDecl); 1430 1431 // FIXME: Remove these and use the ObjCContainerDecl/DeclContext. 1432 llvm::DenseMap<Selector, const ObjCMethodDecl*> InsMap; 1433 llvm::DenseMap<Selector, const ObjCMethodDecl*> ClsMap; 1434 1435 for (unsigned i = 0; i < allNum; i++ ) { 1436 ObjCMethodDecl *Method = 1437 cast_or_null<ObjCMethodDecl>(allMethods[i]); 1438 1439 if (!Method) continue; // Already issued a diagnostic. 1440 if (Method->isInstanceMethod()) { 1441 /// Check for instance method of the same name with incompatible types 1442 const ObjCMethodDecl *&PrevMethod = InsMap[Method->getSelector()]; 1443 bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod) 1444 : false; 1445 if ((isInterfaceDeclKind && PrevMethod && !match) 1446 || (checkIdenticalMethods && match)) { 1447 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 1448 << Method->getDeclName(); 1449 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 1450 } else { 1451 DC->addDecl(Method); 1452 InsMap[Method->getSelector()] = Method; 1453 /// The following allows us to typecheck messages to "id". 1454 AddInstanceMethodToGlobalPool(Method); 1455 // verify that the instance method conforms to the same definition of 1456 // parent methods if it shadows one. 1457 CompareMethodParamsInBaseAndSuper(ClassDecl, Method, true); 1458 } 1459 } else { 1460 /// Check for class method of the same name with incompatible types 1461 const ObjCMethodDecl *&PrevMethod = ClsMap[Method->getSelector()]; 1462 bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod) 1463 : false; 1464 if ((isInterfaceDeclKind && PrevMethod && !match) 1465 || (checkIdenticalMethods && match)) { 1466 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 1467 << Method->getDeclName(); 1468 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 1469 } else { 1470 DC->addDecl(Method); 1471 ClsMap[Method->getSelector()] = Method; 1472 /// The following allows us to typecheck messages to "Class". 1473 AddFactoryMethodToGlobalPool(Method); 1474 // verify that the class method conforms to the same definition of 1475 // parent methods if it shadows one. 1476 CompareMethodParamsInBaseAndSuper(ClassDecl, Method, false); 1477 } 1478 } 1479 } 1480 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl>(ClassDecl)) { 1481 // Compares properties declared in this class to those of its 1482 // super class. 1483 ComparePropertiesInBaseAndSuper(I); 1484 CompareProperties(I, I); 1485 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(ClassDecl)) { 1486 // Categories are used to extend the class by declaring new methods. 1487 // By the same token, they are also used to add new properties. No 1488 // need to compare the added property to those in the class. 1489 1490 // Compare protocol properties with those in category 1491 CompareProperties(C, C); 1492 if (C->IsClassExtension()) 1493 DiagnoseClassExtensionDupMethods(C, C->getClassInterface()); 1494 } 1495 if (ObjCContainerDecl *CDecl = dyn_cast<ObjCContainerDecl>(ClassDecl)) { 1496 if (CDecl->getIdentifier()) 1497 // ProcessPropertyDecl is responsible for diagnosing conflicts with any 1498 // user-defined setter/getter. It also synthesizes setter/getter methods 1499 // and adds them to the DeclContext and global method pools. 1500 for (ObjCContainerDecl::prop_iterator I = CDecl->prop_begin(), 1501 E = CDecl->prop_end(); 1502 I != E; ++I) 1503 ProcessPropertyDecl(*I, CDecl); 1504 CDecl->setAtEndRange(AtEnd); 1505 } 1506 if (ObjCImplementationDecl *IC=dyn_cast<ObjCImplementationDecl>(ClassDecl)) { 1507 IC->setAtEndRange(AtEnd); 1508 if (ObjCInterfaceDecl* IDecl = IC->getClassInterface()) { 1509 if (LangOpts.ObjCNonFragileABI2) 1510 DefaultSynthesizeProperties(S, IC, IDecl); 1511 ImplMethodsVsClassMethods(S, IC, IDecl); 1512 AtomicPropertySetterGetterRules(IC, IDecl); 1513 1514 if (LangOpts.ObjCNonFragileABI2) 1515 while (IDecl->getSuperClass()) { 1516 DiagnoseDuplicateIvars(IDecl, IDecl->getSuperClass()); 1517 IDecl = IDecl->getSuperClass(); 1518 } 1519 } 1520 SetIvarInitializers(IC); 1521 } else if (ObjCCategoryImplDecl* CatImplClass = 1522 dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) { 1523 CatImplClass->setAtEndRange(AtEnd); 1524 1525 // Find category interface decl and then check that all methods declared 1526 // in this interface are implemented in the category @implementation. 1527 if (ObjCInterfaceDecl* IDecl = CatImplClass->getClassInterface()) { 1528 for (ObjCCategoryDecl *Categories = IDecl->getCategoryList(); 1529 Categories; Categories = Categories->getNextClassCategory()) { 1530 if (Categories->getIdentifier() == CatImplClass->getIdentifier()) { 1531 ImplMethodsVsClassMethods(S, CatImplClass, Categories); 1532 break; 1533 } 1534 } 1535 } 1536 } 1537 if (isInterfaceDeclKind) { 1538 // Reject invalid vardecls. 1539 for (unsigned i = 0; i != tuvNum; i++) { 1540 DeclGroupRef DG = allTUVars[i].getAsVal<DeclGroupRef>(); 1541 for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I) 1542 if (VarDecl *VDecl = dyn_cast<VarDecl>(*I)) { 1543 if (!VDecl->hasExternalStorage()) 1544 Diag(VDecl->getLocation(), diag::err_objc_var_decl_inclass); 1545 } 1546 } 1547 } 1548} 1549 1550 1551/// CvtQTToAstBitMask - utility routine to produce an AST bitmask for 1552/// objective-c's type qualifier from the parser version of the same info. 1553static Decl::ObjCDeclQualifier 1554CvtQTToAstBitMask(ObjCDeclSpec::ObjCDeclQualifier PQTVal) { 1555 Decl::ObjCDeclQualifier ret = Decl::OBJC_TQ_None; 1556 if (PQTVal & ObjCDeclSpec::DQ_In) 1557 ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_In); 1558 if (PQTVal & ObjCDeclSpec::DQ_Inout) 1559 ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Inout); 1560 if (PQTVal & ObjCDeclSpec::DQ_Out) 1561 ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Out); 1562 if (PQTVal & ObjCDeclSpec::DQ_Bycopy) 1563 ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Bycopy); 1564 if (PQTVal & ObjCDeclSpec::DQ_Byref) 1565 ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Byref); 1566 if (PQTVal & ObjCDeclSpec::DQ_Oneway) 1567 ret = (Decl::ObjCDeclQualifier)(ret | Decl::OBJC_TQ_Oneway); 1568 1569 return ret; 1570} 1571 1572static inline 1573bool containsInvalidMethodImplAttribute(const AttrVec &A) { 1574 // The 'ibaction' attribute is allowed on method definitions because of 1575 // how the IBAction macro is used on both method declarations and definitions. 1576 // If the method definitions contains any other attributes, return true. 1577 for (AttrVec::const_iterator i = A.begin(), e = A.end(); i != e; ++i) 1578 if ((*i)->getKind() != attr::IBAction) 1579 return true; 1580 return false; 1581} 1582 1583Decl *Sema::ActOnMethodDeclaration( 1584 SourceLocation MethodLoc, SourceLocation EndLoc, 1585 tok::TokenKind MethodType, Decl *ClassDecl, 1586 ObjCDeclSpec &ReturnQT, ParsedType ReturnType, 1587 Selector Sel, 1588 // optional arguments. The number of types/arguments is obtained 1589 // from the Sel.getNumArgs(). 1590 ObjCArgInfo *ArgInfo, 1591 DeclaratorChunk::ParamInfo *CParamInfo, unsigned CNumArgs, // c-style args 1592 AttributeList *AttrList, tok::ObjCKeywordKind MethodDeclKind, 1593 bool isVariadic) { 1594 // Make sure we can establish a context for the method. 1595 if (!ClassDecl) { 1596 Diag(MethodLoc, diag::error_missing_method_context); 1597 getCurFunction()->LabelMap.clear(); 1598 return 0; 1599 } 1600 QualType resultDeclType; 1601 1602 TypeSourceInfo *ResultTInfo = 0; 1603 if (ReturnType) { 1604 resultDeclType = GetTypeFromParser(ReturnType, &ResultTInfo); 1605 1606 // Methods cannot return interface types. All ObjC objects are 1607 // passed by reference. 1608 if (resultDeclType->isObjCObjectType()) { 1609 Diag(MethodLoc, diag::err_object_cannot_be_passed_returned_by_value) 1610 << 0 << resultDeclType; 1611 return 0; 1612 } 1613 } else // get the type for "id". 1614 resultDeclType = Context.getObjCIdType(); 1615 1616 ObjCMethodDecl* ObjCMethod = 1617 ObjCMethodDecl::Create(Context, MethodLoc, EndLoc, Sel, resultDeclType, 1618 ResultTInfo, 1619 cast<DeclContext>(ClassDecl), 1620 MethodType == tok::minus, isVariadic, 1621 false, false, 1622 MethodDeclKind == tok::objc_optional ? 1623 ObjCMethodDecl::Optional : 1624 ObjCMethodDecl::Required); 1625 1626 llvm::SmallVector<ParmVarDecl*, 16> Params; 1627 1628 for (unsigned i = 0, e = Sel.getNumArgs(); i != e; ++i) { 1629 QualType ArgType; 1630 TypeSourceInfo *DI; 1631 1632 if (ArgInfo[i].Type == 0) { 1633 ArgType = Context.getObjCIdType(); 1634 DI = 0; 1635 } else { 1636 ArgType = GetTypeFromParser(ArgInfo[i].Type, &DI); 1637 // Perform the default array/function conversions (C99 6.7.5.3p[7,8]). 1638 ArgType = adjustParameterType(ArgType); 1639 } 1640 1641 ParmVarDecl* Param 1642 = ParmVarDecl::Create(Context, ObjCMethod, ArgInfo[i].NameLoc, 1643 ArgInfo[i].Name, ArgType, DI, 1644 SC_None, SC_None, 0); 1645 1646 if (ArgType->isObjCObjectType()) { 1647 Diag(ArgInfo[i].NameLoc, 1648 diag::err_object_cannot_be_passed_returned_by_value) 1649 << 1 << ArgType; 1650 Param->setInvalidDecl(); 1651 } 1652 1653 Param->setObjCDeclQualifier( 1654 CvtQTToAstBitMask(ArgInfo[i].DeclSpec.getObjCDeclQualifier())); 1655 1656 // Apply the attributes to the parameter. 1657 ProcessDeclAttributeList(TUScope, Param, ArgInfo[i].ArgAttrs); 1658 1659 Params.push_back(Param); 1660 } 1661 1662 for (unsigned i = 0, e = CNumArgs; i != e; ++i) { 1663 ParmVarDecl *Param = cast<ParmVarDecl>(CParamInfo[i].Param); 1664 QualType ArgType = Param->getType(); 1665 if (ArgType.isNull()) 1666 ArgType = Context.getObjCIdType(); 1667 else 1668 // Perform the default array/function conversions (C99 6.7.5.3p[7,8]). 1669 ArgType = adjustParameterType(ArgType); 1670 if (ArgType->isObjCObjectType()) { 1671 Diag(Param->getLocation(), 1672 diag::err_object_cannot_be_passed_returned_by_value) 1673 << 1 << ArgType; 1674 Param->setInvalidDecl(); 1675 } 1676 Param->setDeclContext(ObjCMethod); 1677 if (Param->getDeclName()) 1678 IdResolver.RemoveDecl(Param); 1679 Params.push_back(Param); 1680 } 1681 1682 ObjCMethod->setMethodParams(Context, Params.data(), Params.size(), 1683 Sel.getNumArgs()); 1684 ObjCMethod->setObjCDeclQualifier( 1685 CvtQTToAstBitMask(ReturnQT.getObjCDeclQualifier())); 1686 const ObjCMethodDecl *PrevMethod = 0; 1687 1688 if (AttrList) 1689 ProcessDeclAttributeList(TUScope, ObjCMethod, AttrList); 1690 1691 const ObjCMethodDecl *InterfaceMD = 0; 1692 1693 // For implementations (which can be very "coarse grain"), we add the 1694 // method now. This allows the AST to implement lookup methods that work 1695 // incrementally (without waiting until we parse the @end). It also allows 1696 // us to flag multiple declaration errors as they occur. 1697 if (ObjCImplementationDecl *ImpDecl = 1698 dyn_cast<ObjCImplementationDecl>(ClassDecl)) { 1699 if (MethodType == tok::minus) { 1700 PrevMethod = ImpDecl->getInstanceMethod(Sel); 1701 ImpDecl->addInstanceMethod(ObjCMethod); 1702 } else { 1703 PrevMethod = ImpDecl->getClassMethod(Sel); 1704 ImpDecl->addClassMethod(ObjCMethod); 1705 } 1706 InterfaceMD = ImpDecl->getClassInterface()->getMethod(Sel, 1707 MethodType == tok::minus); 1708 if (ObjCMethod->hasAttrs() && 1709 containsInvalidMethodImplAttribute(ObjCMethod->getAttrs())) 1710 Diag(EndLoc, diag::warn_attribute_method_def); 1711 } else if (ObjCCategoryImplDecl *CatImpDecl = 1712 dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) { 1713 if (MethodType == tok::minus) { 1714 PrevMethod = CatImpDecl->getInstanceMethod(Sel); 1715 CatImpDecl->addInstanceMethod(ObjCMethod); 1716 } else { 1717 PrevMethod = CatImpDecl->getClassMethod(Sel); 1718 CatImpDecl->addClassMethod(ObjCMethod); 1719 } 1720 if (ObjCMethod->hasAttrs() && 1721 containsInvalidMethodImplAttribute(ObjCMethod->getAttrs())) 1722 Diag(EndLoc, diag::warn_attribute_method_def); 1723 } 1724 if (PrevMethod) { 1725 // You can never have two method definitions with the same name. 1726 Diag(ObjCMethod->getLocation(), diag::err_duplicate_method_decl) 1727 << ObjCMethod->getDeclName(); 1728 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 1729 } 1730 1731 // If the interface declared this method, and it was deprecated there, 1732 // mark it deprecated here. 1733 if (InterfaceMD) 1734 if (Attr *DA = InterfaceMD->getAttr<DeprecatedAttr>()) { 1735 StringLiteral *SE = StringLiteral::CreateEmpty(Context, 1); 1736 ObjCMethod->addAttr(::new (Context) 1737 DeprecatedAttr(DA->getLocation(), 1738 Context, 1739 SE->getString())); 1740 } 1741 1742 return ObjCMethod; 1743} 1744 1745bool Sema::CheckObjCDeclScope(Decl *D) { 1746 if (isa<TranslationUnitDecl>(CurContext->getRedeclContext())) 1747 return false; 1748 1749 Diag(D->getLocation(), diag::err_objc_decls_may_only_appear_in_global_scope); 1750 D->setInvalidDecl(); 1751 1752 return true; 1753} 1754 1755/// Called whenever @defs(ClassName) is encountered in the source. Inserts the 1756/// instance variables of ClassName into Decls. 1757void Sema::ActOnDefs(Scope *S, Decl *TagD, SourceLocation DeclStart, 1758 IdentifierInfo *ClassName, 1759 llvm::SmallVectorImpl<Decl*> &Decls) { 1760 // Check that ClassName is a valid class 1761 ObjCInterfaceDecl *Class = getObjCInterfaceDecl(ClassName, DeclStart); 1762 if (!Class) { 1763 Diag(DeclStart, diag::err_undef_interface) << ClassName; 1764 return; 1765 } 1766 if (LangOpts.ObjCNonFragileABI) { 1767 Diag(DeclStart, diag::err_atdef_nonfragile_interface); 1768 return; 1769 } 1770 1771 // Collect the instance variables 1772 llvm::SmallVector<ObjCIvarDecl*, 32> Ivars; 1773 Context.DeepCollectObjCIvars(Class, true, Ivars); 1774 // For each ivar, create a fresh ObjCAtDefsFieldDecl. 1775 for (unsigned i = 0; i < Ivars.size(); i++) { 1776 FieldDecl* ID = cast<FieldDecl>(Ivars[i]); 1777 RecordDecl *Record = dyn_cast<RecordDecl>(TagD); 1778 Decl *FD = ObjCAtDefsFieldDecl::Create(Context, Record, ID->getLocation(), 1779 ID->getIdentifier(), ID->getType(), 1780 ID->getBitWidth()); 1781 Decls.push_back(FD); 1782 } 1783 1784 // Introduce all of these fields into the appropriate scope. 1785 for (llvm::SmallVectorImpl<Decl*>::iterator D = Decls.begin(); 1786 D != Decls.end(); ++D) { 1787 FieldDecl *FD = cast<FieldDecl>(*D); 1788 if (getLangOptions().CPlusPlus) 1789 PushOnScopeChains(cast<FieldDecl>(FD), S); 1790 else if (RecordDecl *Record = dyn_cast<RecordDecl>(TagD)) 1791 Record->addDecl(FD); 1792 } 1793} 1794 1795/// \brief Build a type-check a new Objective-C exception variable declaration. 1796VarDecl *Sema::BuildObjCExceptionDecl(TypeSourceInfo *TInfo, 1797 QualType T, 1798 IdentifierInfo *Name, 1799 SourceLocation NameLoc, 1800 bool Invalid) { 1801 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 1802 // duration shall not be qualified by an address-space qualifier." 1803 // Since all parameters have automatic store duration, they can not have 1804 // an address space. 1805 if (T.getAddressSpace() != 0) { 1806 Diag(NameLoc, diag::err_arg_with_address_space); 1807 Invalid = true; 1808 } 1809 1810 // An @catch parameter must be an unqualified object pointer type; 1811 // FIXME: Recover from "NSObject foo" by inserting the * in "NSObject *foo"? 1812 if (Invalid) { 1813 // Don't do any further checking. 1814 } else if (T->isDependentType()) { 1815 // Okay: we don't know what this type will instantiate to. 1816 } else if (!T->isObjCObjectPointerType()) { 1817 Invalid = true; 1818 Diag(NameLoc ,diag::err_catch_param_not_objc_type); 1819 } else if (T->isObjCQualifiedIdType()) { 1820 Invalid = true; 1821 Diag(NameLoc, diag::err_illegal_qualifiers_on_catch_parm); 1822 } 1823 1824 VarDecl *New = VarDecl::Create(Context, CurContext, NameLoc, Name, T, TInfo, 1825 SC_None, SC_None); 1826 New->setExceptionVariable(true); 1827 1828 if (Invalid) 1829 New->setInvalidDecl(); 1830 return New; 1831} 1832 1833Decl *Sema::ActOnObjCExceptionDecl(Scope *S, Declarator &D) { 1834 const DeclSpec &DS = D.getDeclSpec(); 1835 1836 // We allow the "register" storage class on exception variables because 1837 // GCC did, but we drop it completely. Any other storage class is an error. 1838 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 1839 Diag(DS.getStorageClassSpecLoc(), diag::warn_register_objc_catch_parm) 1840 << FixItHint::CreateRemoval(SourceRange(DS.getStorageClassSpecLoc())); 1841 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 1842 Diag(DS.getStorageClassSpecLoc(), diag::err_storage_spec_on_catch_parm) 1843 << DS.getStorageClassSpec(); 1844 } 1845 if (D.getDeclSpec().isThreadSpecified()) 1846 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 1847 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1848 1849 DiagnoseFunctionSpecifiers(D); 1850 1851 // Check that there are no default arguments inside the type of this 1852 // exception object (C++ only). 1853 if (getLangOptions().CPlusPlus) 1854 CheckExtraCXXDefaultArguments(D); 1855 1856 TagDecl *OwnedDecl = 0; 1857 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 1858 QualType ExceptionType = TInfo->getType(); 1859 1860 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 1861 // Objective-C++: Types shall not be defined in exception types. 1862 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 1863 << Context.getTypeDeclType(OwnedDecl); 1864 } 1865 1866 VarDecl *New = BuildObjCExceptionDecl(TInfo, ExceptionType, D.getIdentifier(), 1867 D.getIdentifierLoc(), 1868 D.isInvalidType()); 1869 1870 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 1871 if (D.getCXXScopeSpec().isSet()) { 1872 Diag(D.getIdentifierLoc(), diag::err_qualified_objc_catch_parm) 1873 << D.getCXXScopeSpec().getRange(); 1874 New->setInvalidDecl(); 1875 } 1876 1877 // Add the parameter declaration into this scope. 1878 S->AddDecl(New); 1879 if (D.getIdentifier()) 1880 IdResolver.AddDecl(New); 1881 1882 ProcessDeclAttributes(S, New, D); 1883 1884 if (New->hasAttr<BlocksAttr>()) 1885 Diag(New->getLocation(), diag::err_block_on_nonlocal); 1886 return New; 1887} 1888 1889/// CollectIvarsToConstructOrDestruct - Collect those ivars which require 1890/// initialization. 1891void Sema::CollectIvarsToConstructOrDestruct(ObjCInterfaceDecl *OI, 1892 llvm::SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 1893 for (ObjCIvarDecl *Iv = OI->all_declared_ivar_begin(); Iv; 1894 Iv= Iv->getNextIvar()) { 1895 QualType QT = Context.getBaseElementType(Iv->getType()); 1896 if (QT->isRecordType()) 1897 Ivars.push_back(Iv); 1898 } 1899} 1900 1901void ObjCImplementationDecl::setIvarInitializers(ASTContext &C, 1902 CXXBaseOrMemberInitializer ** initializers, 1903 unsigned numInitializers) { 1904 if (numInitializers > 0) { 1905 NumIvarInitializers = numInitializers; 1906 CXXBaseOrMemberInitializer **ivarInitializers = 1907 new (C) CXXBaseOrMemberInitializer*[NumIvarInitializers]; 1908 memcpy(ivarInitializers, initializers, 1909 numInitializers * sizeof(CXXBaseOrMemberInitializer*)); 1910 IvarInitializers = ivarInitializers; 1911 } 1912} 1913 1914void Sema::DiagnoseUseOfUnimplementedSelectors() { 1915 if (ReferencedSelectors.empty()) 1916 return; 1917 for (llvm::DenseMap<Selector, SourceLocation>::iterator S = 1918 ReferencedSelectors.begin(), 1919 E = ReferencedSelectors.end(); S != E; ++S) { 1920 Selector Sel = (*S).first; 1921 if (!LookupImplementedMethodInGlobalPool(Sel)) 1922 Diag((*S).second, diag::warn_unimplemented_selector) << Sel; 1923 } 1924 return; 1925} 1926