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/AST/ASTConsumer.h" 16 #include "clang/AST/ASTContext.h" 17 #include "clang/AST/ASTMutationListener.h" 18 #include "clang/AST/DeclObjC.h" 19 #include "clang/AST/Expr.h" 20 #include "clang/AST/ExprObjC.h" 21 #include "clang/Basic/SourceManager.h" 22 #include "clang/Lex/Preprocessor.h" 23 #include "clang/Sema/DeclSpec.h" 24 #include "clang/Sema/ExternalSemaSource.h" 25 #include "clang/Sema/Lookup.h" 26 #include "clang/Sema/Scope.h" 27 #include "clang/Sema/ScopeInfo.h" 28 #include "llvm/ADT/DenseSet.h" 29 30 using namespace clang; 31 32 /// Check whether the given method, which must be in the 'init' 33 /// family, is a valid member of that family. 34 /// 35 /// \param receiverTypeIfCall - if null, check this as if declaring it; 36 /// if non-null, check this as if making a call to it with the given 37 /// receiver type 38 /// 39 /// \return true to indicate that there was an error and appropriate 40 /// actions were taken 41 bool Sema::checkInitMethod(ObjCMethodDecl *method, 42 QualType receiverTypeIfCall) { 43 if (method->isInvalidDecl()) return true; 44 45 // This castAs is safe: methods that don't return an object 46 // pointer won't be inferred as inits and will reject an explicit 47 // objc_method_family(init). 48 49 // We ignore protocols here. Should we? What about Class? 50 51 const ObjCObjectType *result = method->getResultType() 52 ->castAs<ObjCObjectPointerType>()->getObjectType(); 53 54 if (result->isObjCId()) { 55 return false; 56 } else if (result->isObjCClass()) { 57 // fall through: always an error 58 } else { 59 ObjCInterfaceDecl *resultClass = result->getInterface(); 60 assert(resultClass && "unexpected object type!"); 61 62 // It's okay for the result type to still be a forward declaration 63 // if we're checking an interface declaration. 64 if (!resultClass->hasDefinition()) { 65 if (receiverTypeIfCall.isNull() && 66 !isa<ObjCImplementationDecl>(method->getDeclContext())) 67 return false; 68 69 // Otherwise, we try to compare class types. 70 } else { 71 // If this method was declared in a protocol, we can't check 72 // anything unless we have a receiver type that's an interface. 73 const ObjCInterfaceDecl *receiverClass = 0; 74 if (isa<ObjCProtocolDecl>(method->getDeclContext())) { 75 if (receiverTypeIfCall.isNull()) 76 return false; 77 78 receiverClass = receiverTypeIfCall->castAs<ObjCObjectPointerType>() 79 ->getInterfaceDecl(); 80 81 // This can be null for calls to e.g. id<Foo>. 82 if (!receiverClass) return false; 83 } else { 84 receiverClass = method->getClassInterface(); 85 assert(receiverClass && "method not associated with a class!"); 86 } 87 88 // If either class is a subclass of the other, it's fine. 89 if (receiverClass->isSuperClassOf(resultClass) || 90 resultClass->isSuperClassOf(receiverClass)) 91 return false; 92 } 93 } 94 95 SourceLocation loc = method->getLocation(); 96 97 // If we're in a system header, and this is not a call, just make 98 // the method unusable. 99 if (receiverTypeIfCall.isNull() && getSourceManager().isInSystemHeader(loc)) { 100 method->addAttr(new (Context) UnavailableAttr(loc, Context, 101 "init method returns a type unrelated to its receiver type")); 102 return true; 103 } 104 105 // Otherwise, it's an error. 106 Diag(loc, diag::err_arc_init_method_unrelated_result_type); 107 method->setInvalidDecl(); 108 return true; 109 } 110 111 void Sema::CheckObjCMethodOverride(ObjCMethodDecl *NewMethod, 112 const ObjCMethodDecl *Overridden) { 113 if (Overridden->hasRelatedResultType() && 114 !NewMethod->hasRelatedResultType()) { 115 // This can only happen when the method follows a naming convention that 116 // implies a related result type, and the original (overridden) method has 117 // a suitable return type, but the new (overriding) method does not have 118 // a suitable return type. 119 QualType ResultType = NewMethod->getResultType(); 120 SourceRange ResultTypeRange; 121 if (const TypeSourceInfo *ResultTypeInfo 122 = NewMethod->getResultTypeSourceInfo()) 123 ResultTypeRange = ResultTypeInfo->getTypeLoc().getSourceRange(); 124 125 // Figure out which class this method is part of, if any. 126 ObjCInterfaceDecl *CurrentClass 127 = dyn_cast<ObjCInterfaceDecl>(NewMethod->getDeclContext()); 128 if (!CurrentClass) { 129 DeclContext *DC = NewMethod->getDeclContext(); 130 if (ObjCCategoryDecl *Cat = dyn_cast<ObjCCategoryDecl>(DC)) 131 CurrentClass = Cat->getClassInterface(); 132 else if (ObjCImplDecl *Impl = dyn_cast<ObjCImplDecl>(DC)) 133 CurrentClass = Impl->getClassInterface(); 134 else if (ObjCCategoryImplDecl *CatImpl 135 = dyn_cast<ObjCCategoryImplDecl>(DC)) 136 CurrentClass = CatImpl->getClassInterface(); 137 } 138 139 if (CurrentClass) { 140 Diag(NewMethod->getLocation(), 141 diag::warn_related_result_type_compatibility_class) 142 << Context.getObjCInterfaceType(CurrentClass) 143 << ResultType 144 << ResultTypeRange; 145 } else { 146 Diag(NewMethod->getLocation(), 147 diag::warn_related_result_type_compatibility_protocol) 148 << ResultType 149 << ResultTypeRange; 150 } 151 152 if (ObjCMethodFamily Family = Overridden->getMethodFamily()) 153 Diag(Overridden->getLocation(), 154 diag::note_related_result_type_overridden_family) 155 << Family; 156 else 157 Diag(Overridden->getLocation(), 158 diag::note_related_result_type_overridden); 159 } 160 if (getLangOpts().ObjCAutoRefCount) { 161 if ((NewMethod->hasAttr<NSReturnsRetainedAttr>() != 162 Overridden->hasAttr<NSReturnsRetainedAttr>())) { 163 Diag(NewMethod->getLocation(), 164 diag::err_nsreturns_retained_attribute_mismatch) << 1; 165 Diag(Overridden->getLocation(), diag::note_previous_decl) 166 << "method"; 167 } 168 if ((NewMethod->hasAttr<NSReturnsNotRetainedAttr>() != 169 Overridden->hasAttr<NSReturnsNotRetainedAttr>())) { 170 Diag(NewMethod->getLocation(), 171 diag::err_nsreturns_retained_attribute_mismatch) << 0; 172 Diag(Overridden->getLocation(), diag::note_previous_decl) 173 << "method"; 174 } 175 ObjCMethodDecl::param_const_iterator oi = Overridden->param_begin(), 176 oe = Overridden->param_end(); 177 for (ObjCMethodDecl::param_iterator 178 ni = NewMethod->param_begin(), ne = NewMethod->param_end(); 179 ni != ne && oi != oe; ++ni, ++oi) { 180 const ParmVarDecl *oldDecl = (*oi); 181 ParmVarDecl *newDecl = (*ni); 182 if (newDecl->hasAttr<NSConsumedAttr>() != 183 oldDecl->hasAttr<NSConsumedAttr>()) { 184 Diag(newDecl->getLocation(), 185 diag::err_nsconsumed_attribute_mismatch); 186 Diag(oldDecl->getLocation(), diag::note_previous_decl) 187 << "parameter"; 188 } 189 } 190 } 191 } 192 193 /// \brief Check a method declaration for compatibility with the Objective-C 194 /// ARC conventions. 195 static bool CheckARCMethodDecl(Sema &S, ObjCMethodDecl *method) { 196 ObjCMethodFamily family = method->getMethodFamily(); 197 switch (family) { 198 case OMF_None: 199 case OMF_finalize: 200 case OMF_retain: 201 case OMF_release: 202 case OMF_autorelease: 203 case OMF_retainCount: 204 case OMF_self: 205 case OMF_performSelector: 206 return false; 207 208 case OMF_dealloc: 209 if (!S.Context.hasSameType(method->getResultType(), S.Context.VoidTy)) { 210 SourceRange ResultTypeRange; 211 if (const TypeSourceInfo *ResultTypeInfo 212 = method->getResultTypeSourceInfo()) 213 ResultTypeRange = ResultTypeInfo->getTypeLoc().getSourceRange(); 214 if (ResultTypeRange.isInvalid()) 215 S.Diag(method->getLocation(), diag::error_dealloc_bad_result_type) 216 << method->getResultType() 217 << FixItHint::CreateInsertion(method->getSelectorLoc(0), "(void)"); 218 else 219 S.Diag(method->getLocation(), diag::error_dealloc_bad_result_type) 220 << method->getResultType() 221 << FixItHint::CreateReplacement(ResultTypeRange, "void"); 222 return true; 223 } 224 return false; 225 226 case OMF_init: 227 // If the method doesn't obey the init rules, don't bother annotating it. 228 if (S.checkInitMethod(method, QualType())) 229 return true; 230 231 method->addAttr(new (S.Context) NSConsumesSelfAttr(SourceLocation(), 232 S.Context)); 233 234 // Don't add a second copy of this attribute, but otherwise don't 235 // let it be suppressed. 236 if (method->hasAttr<NSReturnsRetainedAttr>()) 237 return false; 238 break; 239 240 case OMF_alloc: 241 case OMF_copy: 242 case OMF_mutableCopy: 243 case OMF_new: 244 if (method->hasAttr<NSReturnsRetainedAttr>() || 245 method->hasAttr<NSReturnsNotRetainedAttr>() || 246 method->hasAttr<NSReturnsAutoreleasedAttr>()) 247 return false; 248 break; 249 } 250 251 method->addAttr(new (S.Context) NSReturnsRetainedAttr(SourceLocation(), 252 S.Context)); 253 return false; 254 } 255 256 static void DiagnoseObjCImplementedDeprecations(Sema &S, 257 NamedDecl *ND, 258 SourceLocation ImplLoc, 259 int select) { 260 if (ND && ND->isDeprecated()) { 261 S.Diag(ImplLoc, diag::warn_deprecated_def) << select; 262 if (select == 0) 263 S.Diag(ND->getLocation(), diag::note_method_declared_at) 264 << ND->getDeclName(); 265 else 266 S.Diag(ND->getLocation(), diag::note_previous_decl) << "class"; 267 } 268 } 269 270 /// AddAnyMethodToGlobalPool - Add any method, instance or factory to global 271 /// pool. 272 void Sema::AddAnyMethodToGlobalPool(Decl *D) { 273 ObjCMethodDecl *MDecl = dyn_cast_or_null<ObjCMethodDecl>(D); 274 275 // If we don't have a valid method decl, simply return. 276 if (!MDecl) 277 return; 278 if (MDecl->isInstanceMethod()) 279 AddInstanceMethodToGlobalPool(MDecl, true); 280 else 281 AddFactoryMethodToGlobalPool(MDecl, true); 282 } 283 284 /// HasExplicitOwnershipAttr - returns true when pointer to ObjC pointer 285 /// has explicit ownership attribute; false otherwise. 286 static bool 287 HasExplicitOwnershipAttr(Sema &S, ParmVarDecl *Param) { 288 QualType T = Param->getType(); 289 290 if (const PointerType *PT = T->getAs<PointerType>()) { 291 T = PT->getPointeeType(); 292 } else if (const ReferenceType *RT = T->getAs<ReferenceType>()) { 293 T = RT->getPointeeType(); 294 } else { 295 return true; 296 } 297 298 // If we have a lifetime qualifier, but it's local, we must have 299 // inferred it. So, it is implicit. 300 return !T.getLocalQualifiers().hasObjCLifetime(); 301 } 302 303 /// ActOnStartOfObjCMethodDef - This routine sets up parameters; invisible 304 /// and user declared, in the method definition's AST. 305 void Sema::ActOnStartOfObjCMethodDef(Scope *FnBodyScope, Decl *D) { 306 assert((getCurMethodDecl() == 0) && "Methodparsing confused"); 307 ObjCMethodDecl *MDecl = dyn_cast_or_null<ObjCMethodDecl>(D); 308 309 // If we don't have a valid method decl, simply return. 310 if (!MDecl) 311 return; 312 313 // Allow all of Sema to see that we are entering a method definition. 314 PushDeclContext(FnBodyScope, MDecl); 315 PushFunctionScope(); 316 317 // Create Decl objects for each parameter, entrring them in the scope for 318 // binding to their use. 319 320 // Insert the invisible arguments, self and _cmd! 321 MDecl->createImplicitParams(Context, MDecl->getClassInterface()); 322 323 PushOnScopeChains(MDecl->getSelfDecl(), FnBodyScope); 324 PushOnScopeChains(MDecl->getCmdDecl(), FnBodyScope); 325 326 // Introduce all of the other parameters into this scope. 327 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(), 328 E = MDecl->param_end(); PI != E; ++PI) { 329 ParmVarDecl *Param = (*PI); 330 if (!Param->isInvalidDecl() && 331 RequireCompleteType(Param->getLocation(), Param->getType(), 332 diag::err_typecheck_decl_incomplete_type)) 333 Param->setInvalidDecl(); 334 if (!Param->isInvalidDecl() && 335 getLangOpts().ObjCAutoRefCount && 336 !HasExplicitOwnershipAttr(*this, Param)) 337 Diag(Param->getLocation(), diag::warn_arc_strong_pointer_objc_pointer) << 338 Param->getType(); 339 340 if ((*PI)->getIdentifier()) 341 PushOnScopeChains(*PI, FnBodyScope); 342 } 343 344 // In ARC, disallow definition of retain/release/autorelease/retainCount 345 if (getLangOpts().ObjCAutoRefCount) { 346 switch (MDecl->getMethodFamily()) { 347 case OMF_retain: 348 case OMF_retainCount: 349 case OMF_release: 350 case OMF_autorelease: 351 Diag(MDecl->getLocation(), diag::err_arc_illegal_method_def) 352 << MDecl->getSelector(); 353 break; 354 355 case OMF_None: 356 case OMF_dealloc: 357 case OMF_finalize: 358 case OMF_alloc: 359 case OMF_init: 360 case OMF_mutableCopy: 361 case OMF_copy: 362 case OMF_new: 363 case OMF_self: 364 case OMF_performSelector: 365 break; 366 } 367 } 368 369 // Warn on deprecated methods under -Wdeprecated-implementations, 370 // and prepare for warning on missing super calls. 371 if (ObjCInterfaceDecl *IC = MDecl->getClassInterface()) { 372 ObjCMethodDecl *IMD = 373 IC->lookupMethod(MDecl->getSelector(), MDecl->isInstanceMethod()); 374 375 if (IMD) { 376 ObjCImplDecl *ImplDeclOfMethodDef = 377 dyn_cast<ObjCImplDecl>(MDecl->getDeclContext()); 378 ObjCContainerDecl *ContDeclOfMethodDecl = 379 dyn_cast<ObjCContainerDecl>(IMD->getDeclContext()); 380 ObjCImplDecl *ImplDeclOfMethodDecl = 0; 381 if (ObjCInterfaceDecl *OID = dyn_cast<ObjCInterfaceDecl>(ContDeclOfMethodDecl)) 382 ImplDeclOfMethodDecl = OID->getImplementation(); 383 else if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(ContDeclOfMethodDecl)) 384 ImplDeclOfMethodDecl = CD->getImplementation(); 385 // No need to issue deprecated warning if deprecated mehod in class/category 386 // is being implemented in its own implementation (no overriding is involved). 387 if (!ImplDeclOfMethodDecl || ImplDeclOfMethodDecl != ImplDeclOfMethodDef) 388 DiagnoseObjCImplementedDeprecations(*this, 389 dyn_cast<NamedDecl>(IMD), 390 MDecl->getLocation(), 0); 391 } 392 393 // If this is "dealloc" or "finalize", set some bit here. 394 // Then in ActOnSuperMessage() (SemaExprObjC), set it back to false. 395 // Finally, in ActOnFinishFunctionBody() (SemaDecl), warn if flag is set. 396 // Only do this if the current class actually has a superclass. 397 if (const ObjCInterfaceDecl *SuperClass = IC->getSuperClass()) { 398 ObjCMethodFamily Family = MDecl->getMethodFamily(); 399 if (Family == OMF_dealloc) { 400 if (!(getLangOpts().ObjCAutoRefCount || 401 getLangOpts().getGC() == LangOptions::GCOnly)) 402 getCurFunction()->ObjCShouldCallSuper = true; 403 404 } else if (Family == OMF_finalize) { 405 if (Context.getLangOpts().getGC() != LangOptions::NonGC) 406 getCurFunction()->ObjCShouldCallSuper = true; 407 408 } else { 409 const ObjCMethodDecl *SuperMethod = 410 SuperClass->lookupMethod(MDecl->getSelector(), 411 MDecl->isInstanceMethod()); 412 getCurFunction()->ObjCShouldCallSuper = 413 (SuperMethod && SuperMethod->hasAttr<ObjCRequiresSuperAttr>()); 414 } 415 } 416 } 417 } 418 419 namespace { 420 421 // Callback to only accept typo corrections that are Objective-C classes. 422 // If an ObjCInterfaceDecl* is given to the constructor, then the validation 423 // function will reject corrections to that class. 424 class ObjCInterfaceValidatorCCC : public CorrectionCandidateCallback { 425 public: 426 ObjCInterfaceValidatorCCC() : CurrentIDecl(0) {} 427 explicit ObjCInterfaceValidatorCCC(ObjCInterfaceDecl *IDecl) 428 : CurrentIDecl(IDecl) {} 429 430 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 431 ObjCInterfaceDecl *ID = candidate.getCorrectionDeclAs<ObjCInterfaceDecl>(); 432 return ID && !declaresSameEntity(ID, CurrentIDecl); 433 } 434 435 private: 436 ObjCInterfaceDecl *CurrentIDecl; 437 }; 438 439 } 440 441 Decl *Sema:: 442 ActOnStartClassInterface(SourceLocation AtInterfaceLoc, 443 IdentifierInfo *ClassName, SourceLocation ClassLoc, 444 IdentifierInfo *SuperName, SourceLocation SuperLoc, 445 Decl * const *ProtoRefs, unsigned NumProtoRefs, 446 const SourceLocation *ProtoLocs, 447 SourceLocation EndProtoLoc, AttributeList *AttrList) { 448 assert(ClassName && "Missing class identifier"); 449 450 // Check for another declaration kind with the same name. 451 NamedDecl *PrevDecl = LookupSingleName(TUScope, ClassName, ClassLoc, 452 LookupOrdinaryName, ForRedeclaration); 453 454 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 455 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName; 456 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 457 } 458 459 // Create a declaration to describe this @interface. 460 ObjCInterfaceDecl* PrevIDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 461 ObjCInterfaceDecl *IDecl 462 = ObjCInterfaceDecl::Create(Context, CurContext, AtInterfaceLoc, ClassName, 463 PrevIDecl, ClassLoc); 464 465 if (PrevIDecl) { 466 // Class already seen. Was it a definition? 467 if (ObjCInterfaceDecl *Def = PrevIDecl->getDefinition()) { 468 Diag(AtInterfaceLoc, diag::err_duplicate_class_def) 469 << PrevIDecl->getDeclName(); 470 Diag(Def->getLocation(), diag::note_previous_definition); 471 IDecl->setInvalidDecl(); 472 } 473 } 474 475 if (AttrList) 476 ProcessDeclAttributeList(TUScope, IDecl, AttrList); 477 PushOnScopeChains(IDecl, TUScope); 478 479 // Start the definition of this class. If we're in a redefinition case, there 480 // may already be a definition, so we'll end up adding to it. 481 if (!IDecl->hasDefinition()) 482 IDecl->startDefinition(); 483 484 if (SuperName) { 485 // Check if a different kind of symbol declared in this scope. 486 PrevDecl = LookupSingleName(TUScope, SuperName, SuperLoc, 487 LookupOrdinaryName); 488 489 if (!PrevDecl) { 490 // Try to correct for a typo in the superclass name without correcting 491 // to the class we're defining. 492 ObjCInterfaceValidatorCCC Validator(IDecl); 493 if (TypoCorrection Corrected = CorrectTypo( 494 DeclarationNameInfo(SuperName, SuperLoc), LookupOrdinaryName, TUScope, 495 NULL, Validator)) { 496 PrevDecl = Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>(); 497 Diag(SuperLoc, diag::err_undef_superclass_suggest) 498 << SuperName << ClassName << PrevDecl->getDeclName(); 499 Diag(PrevDecl->getLocation(), diag::note_previous_decl) 500 << PrevDecl->getDeclName(); 501 } 502 } 503 504 if (declaresSameEntity(PrevDecl, IDecl)) { 505 Diag(SuperLoc, diag::err_recursive_superclass) 506 << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc); 507 IDecl->setEndOfDefinitionLoc(ClassLoc); 508 } else { 509 ObjCInterfaceDecl *SuperClassDecl = 510 dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 511 512 // Diagnose classes that inherit from deprecated classes. 513 if (SuperClassDecl) 514 (void)DiagnoseUseOfDecl(SuperClassDecl, SuperLoc); 515 516 if (PrevDecl && SuperClassDecl == 0) { 517 // The previous declaration was not a class decl. Check if we have a 518 // typedef. If we do, get the underlying class type. 519 if (const TypedefNameDecl *TDecl = 520 dyn_cast_or_null<TypedefNameDecl>(PrevDecl)) { 521 QualType T = TDecl->getUnderlyingType(); 522 if (T->isObjCObjectType()) { 523 if (NamedDecl *IDecl = T->getAs<ObjCObjectType>()->getInterface()) 524 SuperClassDecl = dyn_cast<ObjCInterfaceDecl>(IDecl); 525 } 526 } 527 528 // This handles the following case: 529 // 530 // typedef int SuperClass; 531 // @interface MyClass : SuperClass {} @end 532 // 533 if (!SuperClassDecl) { 534 Diag(SuperLoc, diag::err_redefinition_different_kind) << SuperName; 535 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 536 } 537 } 538 539 if (!dyn_cast_or_null<TypedefNameDecl>(PrevDecl)) { 540 if (!SuperClassDecl) 541 Diag(SuperLoc, diag::err_undef_superclass) 542 << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc); 543 else if (RequireCompleteType(SuperLoc, 544 Context.getObjCInterfaceType(SuperClassDecl), 545 diag::err_forward_superclass, 546 SuperClassDecl->getDeclName(), 547 ClassName, 548 SourceRange(AtInterfaceLoc, ClassLoc))) { 549 SuperClassDecl = 0; 550 } 551 } 552 IDecl->setSuperClass(SuperClassDecl); 553 IDecl->setSuperClassLoc(SuperLoc); 554 IDecl->setEndOfDefinitionLoc(SuperLoc); 555 } 556 } else { // we have a root class. 557 IDecl->setEndOfDefinitionLoc(ClassLoc); 558 } 559 560 // Check then save referenced protocols. 561 if (NumProtoRefs) { 562 IDecl->setProtocolList((ObjCProtocolDecl*const*)ProtoRefs, NumProtoRefs, 563 ProtoLocs, Context); 564 IDecl->setEndOfDefinitionLoc(EndProtoLoc); 565 } 566 567 CheckObjCDeclScope(IDecl); 568 return ActOnObjCContainerStartDefinition(IDecl); 569 } 570 571 /// ActOnCompatibilityAlias - this action is called after complete parsing of 572 /// a \@compatibility_alias declaration. It sets up the alias relationships. 573 Decl *Sema::ActOnCompatibilityAlias(SourceLocation AtLoc, 574 IdentifierInfo *AliasName, 575 SourceLocation AliasLocation, 576 IdentifierInfo *ClassName, 577 SourceLocation ClassLocation) { 578 // Look for previous declaration of alias name 579 NamedDecl *ADecl = LookupSingleName(TUScope, AliasName, AliasLocation, 580 LookupOrdinaryName, ForRedeclaration); 581 if (ADecl) { 582 if (isa<ObjCCompatibleAliasDecl>(ADecl)) 583 Diag(AliasLocation, diag::warn_previous_alias_decl); 584 else 585 Diag(AliasLocation, diag::err_conflicting_aliasing_type) << AliasName; 586 Diag(ADecl->getLocation(), diag::note_previous_declaration); 587 return 0; 588 } 589 // Check for class declaration 590 NamedDecl *CDeclU = LookupSingleName(TUScope, ClassName, ClassLocation, 591 LookupOrdinaryName, ForRedeclaration); 592 if (const TypedefNameDecl *TDecl = 593 dyn_cast_or_null<TypedefNameDecl>(CDeclU)) { 594 QualType T = TDecl->getUnderlyingType(); 595 if (T->isObjCObjectType()) { 596 if (NamedDecl *IDecl = T->getAs<ObjCObjectType>()->getInterface()) { 597 ClassName = IDecl->getIdentifier(); 598 CDeclU = LookupSingleName(TUScope, ClassName, ClassLocation, 599 LookupOrdinaryName, ForRedeclaration); 600 } 601 } 602 } 603 ObjCInterfaceDecl *CDecl = dyn_cast_or_null<ObjCInterfaceDecl>(CDeclU); 604 if (CDecl == 0) { 605 Diag(ClassLocation, diag::warn_undef_interface) << ClassName; 606 if (CDeclU) 607 Diag(CDeclU->getLocation(), diag::note_previous_declaration); 608 return 0; 609 } 610 611 // Everything checked out, instantiate a new alias declaration AST. 612 ObjCCompatibleAliasDecl *AliasDecl = 613 ObjCCompatibleAliasDecl::Create(Context, CurContext, AtLoc, AliasName, CDecl); 614 615 if (!CheckObjCDeclScope(AliasDecl)) 616 PushOnScopeChains(AliasDecl, TUScope); 617 618 return AliasDecl; 619 } 620 621 bool Sema::CheckForwardProtocolDeclarationForCircularDependency( 622 IdentifierInfo *PName, 623 SourceLocation &Ploc, SourceLocation PrevLoc, 624 const ObjCList<ObjCProtocolDecl> &PList) { 625 626 bool res = false; 627 for (ObjCList<ObjCProtocolDecl>::iterator I = PList.begin(), 628 E = PList.end(); I != E; ++I) { 629 if (ObjCProtocolDecl *PDecl = LookupProtocol((*I)->getIdentifier(), 630 Ploc)) { 631 if (PDecl->getIdentifier() == PName) { 632 Diag(Ploc, diag::err_protocol_has_circular_dependency); 633 Diag(PrevLoc, diag::note_previous_definition); 634 res = true; 635 } 636 637 if (!PDecl->hasDefinition()) 638 continue; 639 640 if (CheckForwardProtocolDeclarationForCircularDependency(PName, Ploc, 641 PDecl->getLocation(), PDecl->getReferencedProtocols())) 642 res = true; 643 } 644 } 645 return res; 646 } 647 648 Decl * 649 Sema::ActOnStartProtocolInterface(SourceLocation AtProtoInterfaceLoc, 650 IdentifierInfo *ProtocolName, 651 SourceLocation ProtocolLoc, 652 Decl * const *ProtoRefs, 653 unsigned NumProtoRefs, 654 const SourceLocation *ProtoLocs, 655 SourceLocation EndProtoLoc, 656 AttributeList *AttrList) { 657 bool err = false; 658 // FIXME: Deal with AttrList. 659 assert(ProtocolName && "Missing protocol identifier"); 660 ObjCProtocolDecl *PrevDecl = LookupProtocol(ProtocolName, ProtocolLoc, 661 ForRedeclaration); 662 ObjCProtocolDecl *PDecl = 0; 663 if (ObjCProtocolDecl *Def = PrevDecl? PrevDecl->getDefinition() : 0) { 664 // If we already have a definition, complain. 665 Diag(ProtocolLoc, diag::warn_duplicate_protocol_def) << ProtocolName; 666 Diag(Def->getLocation(), diag::note_previous_definition); 667 668 // Create a new protocol that is completely distinct from previous 669 // declarations, and do not make this protocol available for name lookup. 670 // That way, we'll end up completely ignoring the duplicate. 671 // FIXME: Can we turn this into an error? 672 PDecl = ObjCProtocolDecl::Create(Context, CurContext, ProtocolName, 673 ProtocolLoc, AtProtoInterfaceLoc, 674 /*PrevDecl=*/0); 675 PDecl->startDefinition(); 676 } else { 677 if (PrevDecl) { 678 // Check for circular dependencies among protocol declarations. This can 679 // only happen if this protocol was forward-declared. 680 ObjCList<ObjCProtocolDecl> PList; 681 PList.set((ObjCProtocolDecl *const*)ProtoRefs, NumProtoRefs, Context); 682 err = CheckForwardProtocolDeclarationForCircularDependency( 683 ProtocolName, ProtocolLoc, PrevDecl->getLocation(), PList); 684 } 685 686 // Create the new declaration. 687 PDecl = ObjCProtocolDecl::Create(Context, CurContext, ProtocolName, 688 ProtocolLoc, AtProtoInterfaceLoc, 689 /*PrevDecl=*/PrevDecl); 690 691 PushOnScopeChains(PDecl, TUScope); 692 PDecl->startDefinition(); 693 } 694 695 if (AttrList) 696 ProcessDeclAttributeList(TUScope, PDecl, AttrList); 697 698 // Merge attributes from previous declarations. 699 if (PrevDecl) 700 mergeDeclAttributes(PDecl, PrevDecl); 701 702 if (!err && NumProtoRefs ) { 703 /// Check then save referenced protocols. 704 PDecl->setProtocolList((ObjCProtocolDecl*const*)ProtoRefs, NumProtoRefs, 705 ProtoLocs, Context); 706 } 707 708 CheckObjCDeclScope(PDecl); 709 return ActOnObjCContainerStartDefinition(PDecl); 710 } 711 712 /// FindProtocolDeclaration - This routine looks up protocols and 713 /// issues an error if they are not declared. It returns list of 714 /// protocol declarations in its 'Protocols' argument. 715 void 716 Sema::FindProtocolDeclaration(bool WarnOnDeclarations, 717 const IdentifierLocPair *ProtocolId, 718 unsigned NumProtocols, 719 SmallVectorImpl<Decl *> &Protocols) { 720 for (unsigned i = 0; i != NumProtocols; ++i) { 721 ObjCProtocolDecl *PDecl = LookupProtocol(ProtocolId[i].first, 722 ProtocolId[i].second); 723 if (!PDecl) { 724 DeclFilterCCC<ObjCProtocolDecl> Validator; 725 TypoCorrection Corrected = CorrectTypo( 726 DeclarationNameInfo(ProtocolId[i].first, ProtocolId[i].second), 727 LookupObjCProtocolName, TUScope, NULL, Validator); 728 if ((PDecl = Corrected.getCorrectionDeclAs<ObjCProtocolDecl>())) { 729 Diag(ProtocolId[i].second, diag::err_undeclared_protocol_suggest) 730 << ProtocolId[i].first << Corrected.getCorrection(); 731 Diag(PDecl->getLocation(), diag::note_previous_decl) 732 << PDecl->getDeclName(); 733 } 734 } 735 736 if (!PDecl) { 737 Diag(ProtocolId[i].second, diag::err_undeclared_protocol) 738 << ProtocolId[i].first; 739 continue; 740 } 741 742 (void)DiagnoseUseOfDecl(PDecl, ProtocolId[i].second); 743 744 // If this is a forward declaration and we are supposed to warn in this 745 // case, do it. 746 // FIXME: Recover nicely in the hidden case. 747 if (WarnOnDeclarations && 748 (!PDecl->hasDefinition() || PDecl->getDefinition()->isHidden())) 749 Diag(ProtocolId[i].second, diag::warn_undef_protocolref) 750 << ProtocolId[i].first; 751 Protocols.push_back(PDecl); 752 } 753 } 754 755 /// DiagnoseClassExtensionDupMethods - Check for duplicate declaration of 756 /// a class method in its extension. 757 /// 758 void Sema::DiagnoseClassExtensionDupMethods(ObjCCategoryDecl *CAT, 759 ObjCInterfaceDecl *ID) { 760 if (!ID) 761 return; // Possibly due to previous error 762 763 llvm::DenseMap<Selector, const ObjCMethodDecl*> MethodMap; 764 for (ObjCInterfaceDecl::method_iterator i = ID->meth_begin(), 765 e = ID->meth_end(); i != e; ++i) { 766 ObjCMethodDecl *MD = *i; 767 MethodMap[MD->getSelector()] = MD; 768 } 769 770 if (MethodMap.empty()) 771 return; 772 for (ObjCCategoryDecl::method_iterator i = CAT->meth_begin(), 773 e = CAT->meth_end(); i != e; ++i) { 774 ObjCMethodDecl *Method = *i; 775 const ObjCMethodDecl *&PrevMethod = MethodMap[Method->getSelector()]; 776 if (PrevMethod && !MatchTwoMethodDeclarations(Method, PrevMethod)) { 777 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 778 << Method->getDeclName(); 779 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 780 } 781 } 782 } 783 784 /// ActOnForwardProtocolDeclaration - Handle \@protocol foo; 785 Sema::DeclGroupPtrTy 786 Sema::ActOnForwardProtocolDeclaration(SourceLocation AtProtocolLoc, 787 const IdentifierLocPair *IdentList, 788 unsigned NumElts, 789 AttributeList *attrList) { 790 SmallVector<Decl *, 8> DeclsInGroup; 791 for (unsigned i = 0; i != NumElts; ++i) { 792 IdentifierInfo *Ident = IdentList[i].first; 793 ObjCProtocolDecl *PrevDecl = LookupProtocol(Ident, IdentList[i].second, 794 ForRedeclaration); 795 ObjCProtocolDecl *PDecl 796 = ObjCProtocolDecl::Create(Context, CurContext, Ident, 797 IdentList[i].second, AtProtocolLoc, 798 PrevDecl); 799 800 PushOnScopeChains(PDecl, TUScope); 801 CheckObjCDeclScope(PDecl); 802 803 if (attrList) 804 ProcessDeclAttributeList(TUScope, PDecl, attrList); 805 806 if (PrevDecl) 807 mergeDeclAttributes(PDecl, PrevDecl); 808 809 DeclsInGroup.push_back(PDecl); 810 } 811 812 return BuildDeclaratorGroup(DeclsInGroup.data(), DeclsInGroup.size(), false); 813 } 814 815 Decl *Sema:: 816 ActOnStartCategoryInterface(SourceLocation AtInterfaceLoc, 817 IdentifierInfo *ClassName, SourceLocation ClassLoc, 818 IdentifierInfo *CategoryName, 819 SourceLocation CategoryLoc, 820 Decl * const *ProtoRefs, 821 unsigned NumProtoRefs, 822 const SourceLocation *ProtoLocs, 823 SourceLocation EndProtoLoc) { 824 ObjCCategoryDecl *CDecl; 825 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true); 826 827 /// Check that class of this category is already completely declared. 828 829 if (!IDecl 830 || RequireCompleteType(ClassLoc, Context.getObjCInterfaceType(IDecl), 831 diag::err_category_forward_interface, 832 CategoryName == 0)) { 833 // Create an invalid ObjCCategoryDecl to serve as context for 834 // the enclosing method declarations. We mark the decl invalid 835 // to make it clear that this isn't a valid AST. 836 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc, 837 ClassLoc, CategoryLoc, CategoryName,IDecl); 838 CDecl->setInvalidDecl(); 839 CurContext->addDecl(CDecl); 840 841 if (!IDecl) 842 Diag(ClassLoc, diag::err_undef_interface) << ClassName; 843 return ActOnObjCContainerStartDefinition(CDecl); 844 } 845 846 if (!CategoryName && IDecl->getImplementation()) { 847 Diag(ClassLoc, diag::err_class_extension_after_impl) << ClassName; 848 Diag(IDecl->getImplementation()->getLocation(), 849 diag::note_implementation_declared); 850 } 851 852 if (CategoryName) { 853 /// Check for duplicate interface declaration for this category 854 if (ObjCCategoryDecl *Previous 855 = IDecl->FindCategoryDeclaration(CategoryName)) { 856 // Class extensions can be declared multiple times, categories cannot. 857 Diag(CategoryLoc, diag::warn_dup_category_def) 858 << ClassName << CategoryName; 859 Diag(Previous->getLocation(), diag::note_previous_definition); 860 } 861 } 862 863 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc, 864 ClassLoc, CategoryLoc, CategoryName, IDecl); 865 // FIXME: PushOnScopeChains? 866 CurContext->addDecl(CDecl); 867 868 if (NumProtoRefs) { 869 CDecl->setProtocolList((ObjCProtocolDecl*const*)ProtoRefs, NumProtoRefs, 870 ProtoLocs, Context); 871 // Protocols in the class extension belong to the class. 872 if (CDecl->IsClassExtension()) 873 IDecl->mergeClassExtensionProtocolList((ObjCProtocolDecl*const*)ProtoRefs, 874 NumProtoRefs, Context); 875 } 876 877 CheckObjCDeclScope(CDecl); 878 return ActOnObjCContainerStartDefinition(CDecl); 879 } 880 881 /// ActOnStartCategoryImplementation - Perform semantic checks on the 882 /// category implementation declaration and build an ObjCCategoryImplDecl 883 /// object. 884 Decl *Sema::ActOnStartCategoryImplementation( 885 SourceLocation AtCatImplLoc, 886 IdentifierInfo *ClassName, SourceLocation ClassLoc, 887 IdentifierInfo *CatName, SourceLocation CatLoc) { 888 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true); 889 ObjCCategoryDecl *CatIDecl = 0; 890 if (IDecl && IDecl->hasDefinition()) { 891 CatIDecl = IDecl->FindCategoryDeclaration(CatName); 892 if (!CatIDecl) { 893 // Category @implementation with no corresponding @interface. 894 // Create and install one. 895 CatIDecl = ObjCCategoryDecl::Create(Context, CurContext, AtCatImplLoc, 896 ClassLoc, CatLoc, 897 CatName, IDecl); 898 CatIDecl->setImplicit(); 899 } 900 } 901 902 ObjCCategoryImplDecl *CDecl = 903 ObjCCategoryImplDecl::Create(Context, CurContext, CatName, IDecl, 904 ClassLoc, AtCatImplLoc, CatLoc); 905 /// Check that class of this category is already completely declared. 906 if (!IDecl) { 907 Diag(ClassLoc, diag::err_undef_interface) << ClassName; 908 CDecl->setInvalidDecl(); 909 } else if (RequireCompleteType(ClassLoc, Context.getObjCInterfaceType(IDecl), 910 diag::err_undef_interface)) { 911 CDecl->setInvalidDecl(); 912 } 913 914 // FIXME: PushOnScopeChains? 915 CurContext->addDecl(CDecl); 916 917 // If the interface is deprecated/unavailable, warn/error about it. 918 if (IDecl) 919 DiagnoseUseOfDecl(IDecl, ClassLoc); 920 921 /// Check that CatName, category name, is not used in another implementation. 922 if (CatIDecl) { 923 if (CatIDecl->getImplementation()) { 924 Diag(ClassLoc, diag::err_dup_implementation_category) << ClassName 925 << CatName; 926 Diag(CatIDecl->getImplementation()->getLocation(), 927 diag::note_previous_definition); 928 } else { 929 CatIDecl->setImplementation(CDecl); 930 // Warn on implementating category of deprecated class under 931 // -Wdeprecated-implementations flag. 932 DiagnoseObjCImplementedDeprecations(*this, 933 dyn_cast<NamedDecl>(IDecl), 934 CDecl->getLocation(), 2); 935 } 936 } 937 938 CheckObjCDeclScope(CDecl); 939 return ActOnObjCContainerStartDefinition(CDecl); 940 } 941 942 Decl *Sema::ActOnStartClassImplementation( 943 SourceLocation AtClassImplLoc, 944 IdentifierInfo *ClassName, SourceLocation ClassLoc, 945 IdentifierInfo *SuperClassname, 946 SourceLocation SuperClassLoc) { 947 ObjCInterfaceDecl* IDecl = 0; 948 // Check for another declaration kind with the same name. 949 NamedDecl *PrevDecl 950 = LookupSingleName(TUScope, ClassName, ClassLoc, LookupOrdinaryName, 951 ForRedeclaration); 952 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 953 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName; 954 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 955 } else if ((IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl))) { 956 RequireCompleteType(ClassLoc, Context.getObjCInterfaceType(IDecl), 957 diag::warn_undef_interface); 958 } else { 959 // We did not find anything with the name ClassName; try to correct for 960 // typos in the class name. 961 ObjCInterfaceValidatorCCC Validator; 962 if (TypoCorrection Corrected = CorrectTypo( 963 DeclarationNameInfo(ClassName, ClassLoc), LookupOrdinaryName, TUScope, 964 NULL, Validator)) { 965 // Suggest the (potentially) correct interface name. However, put the 966 // fix-it hint itself in a separate note, since changing the name in 967 // the warning would make the fix-it change semantics.However, don't 968 // provide a code-modification hint or use the typo name for recovery, 969 // because this is just a warning. The program may actually be correct. 970 IDecl = Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>(); 971 DeclarationName CorrectedName = Corrected.getCorrection(); 972 Diag(ClassLoc, diag::warn_undef_interface_suggest) 973 << ClassName << CorrectedName; 974 Diag(IDecl->getLocation(), diag::note_previous_decl) << CorrectedName 975 << FixItHint::CreateReplacement(ClassLoc, CorrectedName.getAsString()); 976 IDecl = 0; 977 } else { 978 Diag(ClassLoc, diag::warn_undef_interface) << ClassName; 979 } 980 } 981 982 // Check that super class name is valid class name 983 ObjCInterfaceDecl* SDecl = 0; 984 if (SuperClassname) { 985 // Check if a different kind of symbol declared in this scope. 986 PrevDecl = LookupSingleName(TUScope, SuperClassname, SuperClassLoc, 987 LookupOrdinaryName); 988 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 989 Diag(SuperClassLoc, diag::err_redefinition_different_kind) 990 << SuperClassname; 991 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 992 } else { 993 SDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 994 if (SDecl && !SDecl->hasDefinition()) 995 SDecl = 0; 996 if (!SDecl) 997 Diag(SuperClassLoc, diag::err_undef_superclass) 998 << SuperClassname << ClassName; 999 else if (IDecl && !declaresSameEntity(IDecl->getSuperClass(), SDecl)) { 1000 // This implementation and its interface do not have the same 1001 // super class. 1002 Diag(SuperClassLoc, diag::err_conflicting_super_class) 1003 << SDecl->getDeclName(); 1004 Diag(SDecl->getLocation(), diag::note_previous_definition); 1005 } 1006 } 1007 } 1008 1009 if (!IDecl) { 1010 // Legacy case of @implementation with no corresponding @interface. 1011 // Build, chain & install the interface decl into the identifier. 1012 1013 // FIXME: Do we support attributes on the @implementation? If so we should 1014 // copy them over. 1015 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtClassImplLoc, 1016 ClassName, /*PrevDecl=*/0, ClassLoc, 1017 true); 1018 IDecl->startDefinition(); 1019 if (SDecl) { 1020 IDecl->setSuperClass(SDecl); 1021 IDecl->setSuperClassLoc(SuperClassLoc); 1022 IDecl->setEndOfDefinitionLoc(SuperClassLoc); 1023 } else { 1024 IDecl->setEndOfDefinitionLoc(ClassLoc); 1025 } 1026 1027 PushOnScopeChains(IDecl, TUScope); 1028 } else { 1029 // Mark the interface as being completed, even if it was just as 1030 // @class ....; 1031 // declaration; the user cannot reopen it. 1032 if (!IDecl->hasDefinition()) 1033 IDecl->startDefinition(); 1034 } 1035 1036 ObjCImplementationDecl* IMPDecl = 1037 ObjCImplementationDecl::Create(Context, CurContext, IDecl, SDecl, 1038 ClassLoc, AtClassImplLoc); 1039 1040 if (CheckObjCDeclScope(IMPDecl)) 1041 return ActOnObjCContainerStartDefinition(IMPDecl); 1042 1043 // Check that there is no duplicate implementation of this class. 1044 if (IDecl->getImplementation()) { 1045 // FIXME: Don't leak everything! 1046 Diag(ClassLoc, diag::err_dup_implementation_class) << ClassName; 1047 Diag(IDecl->getImplementation()->getLocation(), 1048 diag::note_previous_definition); 1049 } else { // add it to the list. 1050 IDecl->setImplementation(IMPDecl); 1051 PushOnScopeChains(IMPDecl, TUScope); 1052 // Warn on implementating deprecated class under 1053 // -Wdeprecated-implementations flag. 1054 DiagnoseObjCImplementedDeprecations(*this, 1055 dyn_cast<NamedDecl>(IDecl), 1056 IMPDecl->getLocation(), 1); 1057 } 1058 return ActOnObjCContainerStartDefinition(IMPDecl); 1059 } 1060 1061 Sema::DeclGroupPtrTy 1062 Sema::ActOnFinishObjCImplementation(Decl *ObjCImpDecl, ArrayRef<Decl *> Decls) { 1063 SmallVector<Decl *, 64> DeclsInGroup; 1064 DeclsInGroup.reserve(Decls.size() + 1); 1065 1066 for (unsigned i = 0, e = Decls.size(); i != e; ++i) { 1067 Decl *Dcl = Decls[i]; 1068 if (!Dcl) 1069 continue; 1070 if (Dcl->getDeclContext()->isFileContext()) 1071 Dcl->setTopLevelDeclInObjCContainer(); 1072 DeclsInGroup.push_back(Dcl); 1073 } 1074 1075 DeclsInGroup.push_back(ObjCImpDecl); 1076 1077 return BuildDeclaratorGroup(DeclsInGroup.data(), DeclsInGroup.size(), false); 1078 } 1079 1080 void Sema::CheckImplementationIvars(ObjCImplementationDecl *ImpDecl, 1081 ObjCIvarDecl **ivars, unsigned numIvars, 1082 SourceLocation RBrace) { 1083 assert(ImpDecl && "missing implementation decl"); 1084 ObjCInterfaceDecl* IDecl = ImpDecl->getClassInterface(); 1085 if (!IDecl) 1086 return; 1087 /// Check case of non-existing \@interface decl. 1088 /// (legacy objective-c \@implementation decl without an \@interface decl). 1089 /// Add implementations's ivar to the synthesize class's ivar list. 1090 if (IDecl->isImplicitInterfaceDecl()) { 1091 IDecl->setEndOfDefinitionLoc(RBrace); 1092 // Add ivar's to class's DeclContext. 1093 for (unsigned i = 0, e = numIvars; i != e; ++i) { 1094 ivars[i]->setLexicalDeclContext(ImpDecl); 1095 IDecl->makeDeclVisibleInContext(ivars[i]); 1096 ImpDecl->addDecl(ivars[i]); 1097 } 1098 1099 return; 1100 } 1101 // If implementation has empty ivar list, just return. 1102 if (numIvars == 0) 1103 return; 1104 1105 assert(ivars && "missing @implementation ivars"); 1106 if (LangOpts.ObjCRuntime.isNonFragile()) { 1107 if (ImpDecl->getSuperClass()) 1108 Diag(ImpDecl->getLocation(), diag::warn_on_superclass_use); 1109 for (unsigned i = 0; i < numIvars; i++) { 1110 ObjCIvarDecl* ImplIvar = ivars[i]; 1111 if (const ObjCIvarDecl *ClsIvar = 1112 IDecl->getIvarDecl(ImplIvar->getIdentifier())) { 1113 Diag(ImplIvar->getLocation(), diag::err_duplicate_ivar_declaration); 1114 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 1115 continue; 1116 } 1117 // Instance ivar to Implementation's DeclContext. 1118 ImplIvar->setLexicalDeclContext(ImpDecl); 1119 IDecl->makeDeclVisibleInContext(ImplIvar); 1120 ImpDecl->addDecl(ImplIvar); 1121 } 1122 return; 1123 } 1124 // Check interface's Ivar list against those in the implementation. 1125 // names and types must match. 1126 // 1127 unsigned j = 0; 1128 ObjCInterfaceDecl::ivar_iterator 1129 IVI = IDecl->ivar_begin(), IVE = IDecl->ivar_end(); 1130 for (; numIvars > 0 && IVI != IVE; ++IVI) { 1131 ObjCIvarDecl* ImplIvar = ivars[j++]; 1132 ObjCIvarDecl* ClsIvar = *IVI; 1133 assert (ImplIvar && "missing implementation ivar"); 1134 assert (ClsIvar && "missing class ivar"); 1135 1136 // First, make sure the types match. 1137 if (!Context.hasSameType(ImplIvar->getType(), ClsIvar->getType())) { 1138 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_type) 1139 << ImplIvar->getIdentifier() 1140 << ImplIvar->getType() << ClsIvar->getType(); 1141 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 1142 } else if (ImplIvar->isBitField() && ClsIvar->isBitField() && 1143 ImplIvar->getBitWidthValue(Context) != 1144 ClsIvar->getBitWidthValue(Context)) { 1145 Diag(ImplIvar->getBitWidth()->getLocStart(), 1146 diag::err_conflicting_ivar_bitwidth) << ImplIvar->getIdentifier(); 1147 Diag(ClsIvar->getBitWidth()->getLocStart(), 1148 diag::note_previous_definition); 1149 } 1150 // Make sure the names are identical. 1151 if (ImplIvar->getIdentifier() != ClsIvar->getIdentifier()) { 1152 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_name) 1153 << ImplIvar->getIdentifier() << ClsIvar->getIdentifier(); 1154 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 1155 } 1156 --numIvars; 1157 } 1158 1159 if (numIvars > 0) 1160 Diag(ivars[j]->getLocation(), diag::err_inconsistant_ivar_count); 1161 else if (IVI != IVE) 1162 Diag(IVI->getLocation(), diag::err_inconsistant_ivar_count); 1163 } 1164 1165 void Sema::WarnUndefinedMethod(SourceLocation ImpLoc, ObjCMethodDecl *method, 1166 bool &IncompleteImpl, unsigned DiagID) { 1167 // No point warning no definition of method which is 'unavailable'. 1168 switch (method->getAvailability()) { 1169 case AR_Available: 1170 case AR_Deprecated: 1171 break; 1172 1173 // Don't warn about unavailable or not-yet-introduced methods. 1174 case AR_NotYetIntroduced: 1175 case AR_Unavailable: 1176 return; 1177 } 1178 1179 if (!IncompleteImpl) { 1180 Diag(ImpLoc, diag::warn_incomplete_impl); 1181 IncompleteImpl = true; 1182 } 1183 if (DiagID == diag::warn_unimplemented_protocol_method) 1184 Diag(ImpLoc, DiagID) << method->getDeclName(); 1185 else 1186 Diag(method->getLocation(), DiagID) << method->getDeclName(); 1187 } 1188 1189 /// Determines if type B can be substituted for type A. Returns true if we can 1190 /// guarantee that anything that the user will do to an object of type A can 1191 /// also be done to an object of type B. This is trivially true if the two 1192 /// types are the same, or if B is a subclass of A. It becomes more complex 1193 /// in cases where protocols are involved. 1194 /// 1195 /// Object types in Objective-C describe the minimum requirements for an 1196 /// object, rather than providing a complete description of a type. For 1197 /// example, if A is a subclass of B, then B* may refer to an instance of A. 1198 /// The principle of substitutability means that we may use an instance of A 1199 /// anywhere that we may use an instance of B - it will implement all of the 1200 /// ivars of B and all of the methods of B. 1201 /// 1202 /// This substitutability is important when type checking methods, because 1203 /// the implementation may have stricter type definitions than the interface. 1204 /// The interface specifies minimum requirements, but the implementation may 1205 /// have more accurate ones. For example, a method may privately accept 1206 /// instances of B, but only publish that it accepts instances of A. Any 1207 /// object passed to it will be type checked against B, and so will implicitly 1208 /// by a valid A*. Similarly, a method may return a subclass of the class that 1209 /// it is declared as returning. 1210 /// 1211 /// This is most important when considering subclassing. A method in a 1212 /// subclass must accept any object as an argument that its superclass's 1213 /// implementation accepts. It may, however, accept a more general type 1214 /// without breaking substitutability (i.e. you can still use the subclass 1215 /// anywhere that you can use the superclass, but not vice versa). The 1216 /// converse requirement applies to return types: the return type for a 1217 /// subclass method must be a valid object of the kind that the superclass 1218 /// advertises, but it may be specified more accurately. This avoids the need 1219 /// for explicit down-casting by callers. 1220 /// 1221 /// Note: This is a stricter requirement than for assignment. 1222 static bool isObjCTypeSubstitutable(ASTContext &Context, 1223 const ObjCObjectPointerType *A, 1224 const ObjCObjectPointerType *B, 1225 bool rejectId) { 1226 // Reject a protocol-unqualified id. 1227 if (rejectId && B->isObjCIdType()) return false; 1228 1229 // If B is a qualified id, then A must also be a qualified id and it must 1230 // implement all of the protocols in B. It may not be a qualified class. 1231 // For example, MyClass<A> can be assigned to id<A>, but MyClass<A> is a 1232 // stricter definition so it is not substitutable for id<A>. 1233 if (B->isObjCQualifiedIdType()) { 1234 return A->isObjCQualifiedIdType() && 1235 Context.ObjCQualifiedIdTypesAreCompatible(QualType(A, 0), 1236 QualType(B,0), 1237 false); 1238 } 1239 1240 /* 1241 // id is a special type that bypasses type checking completely. We want a 1242 // warning when it is used in one place but not another. 1243 if (C.isObjCIdType(A) || C.isObjCIdType(B)) return false; 1244 1245 1246 // If B is a qualified id, then A must also be a qualified id (which it isn't 1247 // if we've got this far) 1248 if (B->isObjCQualifiedIdType()) return false; 1249 */ 1250 1251 // Now we know that A and B are (potentially-qualified) class types. The 1252 // normal rules for assignment apply. 1253 return Context.canAssignObjCInterfaces(A, B); 1254 } 1255 1256 static SourceRange getTypeRange(TypeSourceInfo *TSI) { 1257 return (TSI ? TSI->getTypeLoc().getSourceRange() : SourceRange()); 1258 } 1259 1260 static bool CheckMethodOverrideReturn(Sema &S, 1261 ObjCMethodDecl *MethodImpl, 1262 ObjCMethodDecl *MethodDecl, 1263 bool IsProtocolMethodDecl, 1264 bool IsOverridingMode, 1265 bool Warn) { 1266 if (IsProtocolMethodDecl && 1267 (MethodDecl->getObjCDeclQualifier() != 1268 MethodImpl->getObjCDeclQualifier())) { 1269 if (Warn) { 1270 S.Diag(MethodImpl->getLocation(), 1271 (IsOverridingMode ? 1272 diag::warn_conflicting_overriding_ret_type_modifiers 1273 : diag::warn_conflicting_ret_type_modifiers)) 1274 << MethodImpl->getDeclName() 1275 << getTypeRange(MethodImpl->getResultTypeSourceInfo()); 1276 S.Diag(MethodDecl->getLocation(), diag::note_previous_declaration) 1277 << getTypeRange(MethodDecl->getResultTypeSourceInfo()); 1278 } 1279 else 1280 return false; 1281 } 1282 1283 if (S.Context.hasSameUnqualifiedType(MethodImpl->getResultType(), 1284 MethodDecl->getResultType())) 1285 return true; 1286 if (!Warn) 1287 return false; 1288 1289 unsigned DiagID = 1290 IsOverridingMode ? diag::warn_conflicting_overriding_ret_types 1291 : diag::warn_conflicting_ret_types; 1292 1293 // Mismatches between ObjC pointers go into a different warning 1294 // category, and sometimes they're even completely whitelisted. 1295 if (const ObjCObjectPointerType *ImplPtrTy = 1296 MethodImpl->getResultType()->getAs<ObjCObjectPointerType>()) { 1297 if (const ObjCObjectPointerType *IfacePtrTy = 1298 MethodDecl->getResultType()->getAs<ObjCObjectPointerType>()) { 1299 // Allow non-matching return types as long as they don't violate 1300 // the principle of substitutability. Specifically, we permit 1301 // return types that are subclasses of the declared return type, 1302 // or that are more-qualified versions of the declared type. 1303 if (isObjCTypeSubstitutable(S.Context, IfacePtrTy, ImplPtrTy, false)) 1304 return false; 1305 1306 DiagID = 1307 IsOverridingMode ? diag::warn_non_covariant_overriding_ret_types 1308 : diag::warn_non_covariant_ret_types; 1309 } 1310 } 1311 1312 S.Diag(MethodImpl->getLocation(), DiagID) 1313 << MethodImpl->getDeclName() 1314 << MethodDecl->getResultType() 1315 << MethodImpl->getResultType() 1316 << getTypeRange(MethodImpl->getResultTypeSourceInfo()); 1317 S.Diag(MethodDecl->getLocation(), 1318 IsOverridingMode ? diag::note_previous_declaration 1319 : diag::note_previous_definition) 1320 << getTypeRange(MethodDecl->getResultTypeSourceInfo()); 1321 return false; 1322 } 1323 1324 static bool CheckMethodOverrideParam(Sema &S, 1325 ObjCMethodDecl *MethodImpl, 1326 ObjCMethodDecl *MethodDecl, 1327 ParmVarDecl *ImplVar, 1328 ParmVarDecl *IfaceVar, 1329 bool IsProtocolMethodDecl, 1330 bool IsOverridingMode, 1331 bool Warn) { 1332 if (IsProtocolMethodDecl && 1333 (ImplVar->getObjCDeclQualifier() != 1334 IfaceVar->getObjCDeclQualifier())) { 1335 if (Warn) { 1336 if (IsOverridingMode) 1337 S.Diag(ImplVar->getLocation(), 1338 diag::warn_conflicting_overriding_param_modifiers) 1339 << getTypeRange(ImplVar->getTypeSourceInfo()) 1340 << MethodImpl->getDeclName(); 1341 else S.Diag(ImplVar->getLocation(), 1342 diag::warn_conflicting_param_modifiers) 1343 << getTypeRange(ImplVar->getTypeSourceInfo()) 1344 << MethodImpl->getDeclName(); 1345 S.Diag(IfaceVar->getLocation(), diag::note_previous_declaration) 1346 << getTypeRange(IfaceVar->getTypeSourceInfo()); 1347 } 1348 else 1349 return false; 1350 } 1351 1352 QualType ImplTy = ImplVar->getType(); 1353 QualType IfaceTy = IfaceVar->getType(); 1354 1355 if (S.Context.hasSameUnqualifiedType(ImplTy, IfaceTy)) 1356 return true; 1357 1358 if (!Warn) 1359 return false; 1360 unsigned DiagID = 1361 IsOverridingMode ? diag::warn_conflicting_overriding_param_types 1362 : diag::warn_conflicting_param_types; 1363 1364 // Mismatches between ObjC pointers go into a different warning 1365 // category, and sometimes they're even completely whitelisted. 1366 if (const ObjCObjectPointerType *ImplPtrTy = 1367 ImplTy->getAs<ObjCObjectPointerType>()) { 1368 if (const ObjCObjectPointerType *IfacePtrTy = 1369 IfaceTy->getAs<ObjCObjectPointerType>()) { 1370 // Allow non-matching argument types as long as they don't 1371 // violate the principle of substitutability. Specifically, the 1372 // implementation must accept any objects that the superclass 1373 // accepts, however it may also accept others. 1374 if (isObjCTypeSubstitutable(S.Context, ImplPtrTy, IfacePtrTy, true)) 1375 return false; 1376 1377 DiagID = 1378 IsOverridingMode ? diag::warn_non_contravariant_overriding_param_types 1379 : diag::warn_non_contravariant_param_types; 1380 } 1381 } 1382 1383 S.Diag(ImplVar->getLocation(), DiagID) 1384 << getTypeRange(ImplVar->getTypeSourceInfo()) 1385 << MethodImpl->getDeclName() << IfaceTy << ImplTy; 1386 S.Diag(IfaceVar->getLocation(), 1387 (IsOverridingMode ? diag::note_previous_declaration 1388 : diag::note_previous_definition)) 1389 << getTypeRange(IfaceVar->getTypeSourceInfo()); 1390 return false; 1391 } 1392 1393 /// In ARC, check whether the conventional meanings of the two methods 1394 /// match. If they don't, it's a hard error. 1395 static bool checkMethodFamilyMismatch(Sema &S, ObjCMethodDecl *impl, 1396 ObjCMethodDecl *decl) { 1397 ObjCMethodFamily implFamily = impl->getMethodFamily(); 1398 ObjCMethodFamily declFamily = decl->getMethodFamily(); 1399 if (implFamily == declFamily) return false; 1400 1401 // Since conventions are sorted by selector, the only possibility is 1402 // that the types differ enough to cause one selector or the other 1403 // to fall out of the family. 1404 assert(implFamily == OMF_None || declFamily == OMF_None); 1405 1406 // No further diagnostics required on invalid declarations. 1407 if (impl->isInvalidDecl() || decl->isInvalidDecl()) return true; 1408 1409 const ObjCMethodDecl *unmatched = impl; 1410 ObjCMethodFamily family = declFamily; 1411 unsigned errorID = diag::err_arc_lost_method_convention; 1412 unsigned noteID = diag::note_arc_lost_method_convention; 1413 if (declFamily == OMF_None) { 1414 unmatched = decl; 1415 family = implFamily; 1416 errorID = diag::err_arc_gained_method_convention; 1417 noteID = diag::note_arc_gained_method_convention; 1418 } 1419 1420 // Indexes into a %select clause in the diagnostic. 1421 enum FamilySelector { 1422 F_alloc, F_copy, F_mutableCopy = F_copy, F_init, F_new 1423 }; 1424 FamilySelector familySelector = FamilySelector(); 1425 1426 switch (family) { 1427 case OMF_None: llvm_unreachable("logic error, no method convention"); 1428 case OMF_retain: 1429 case OMF_release: 1430 case OMF_autorelease: 1431 case OMF_dealloc: 1432 case OMF_finalize: 1433 case OMF_retainCount: 1434 case OMF_self: 1435 case OMF_performSelector: 1436 // Mismatches for these methods don't change ownership 1437 // conventions, so we don't care. 1438 return false; 1439 1440 case OMF_init: familySelector = F_init; break; 1441 case OMF_alloc: familySelector = F_alloc; break; 1442 case OMF_copy: familySelector = F_copy; break; 1443 case OMF_mutableCopy: familySelector = F_mutableCopy; break; 1444 case OMF_new: familySelector = F_new; break; 1445 } 1446 1447 enum ReasonSelector { R_NonObjectReturn, R_UnrelatedReturn }; 1448 ReasonSelector reasonSelector; 1449 1450 // The only reason these methods don't fall within their families is 1451 // due to unusual result types. 1452 if (unmatched->getResultType()->isObjCObjectPointerType()) { 1453 reasonSelector = R_UnrelatedReturn; 1454 } else { 1455 reasonSelector = R_NonObjectReturn; 1456 } 1457 1458 S.Diag(impl->getLocation(), errorID) << familySelector << reasonSelector; 1459 S.Diag(decl->getLocation(), noteID) << familySelector << reasonSelector; 1460 1461 return true; 1462 } 1463 1464 void Sema::WarnConflictingTypedMethods(ObjCMethodDecl *ImpMethodDecl, 1465 ObjCMethodDecl *MethodDecl, 1466 bool IsProtocolMethodDecl) { 1467 if (getLangOpts().ObjCAutoRefCount && 1468 checkMethodFamilyMismatch(*this, ImpMethodDecl, MethodDecl)) 1469 return; 1470 1471 CheckMethodOverrideReturn(*this, ImpMethodDecl, MethodDecl, 1472 IsProtocolMethodDecl, false, 1473 true); 1474 1475 for (ObjCMethodDecl::param_iterator IM = ImpMethodDecl->param_begin(), 1476 IF = MethodDecl->param_begin(), EM = ImpMethodDecl->param_end(), 1477 EF = MethodDecl->param_end(); 1478 IM != EM && IF != EF; ++IM, ++IF) { 1479 CheckMethodOverrideParam(*this, ImpMethodDecl, MethodDecl, *IM, *IF, 1480 IsProtocolMethodDecl, false, true); 1481 } 1482 1483 if (ImpMethodDecl->isVariadic() != MethodDecl->isVariadic()) { 1484 Diag(ImpMethodDecl->getLocation(), 1485 diag::warn_conflicting_variadic); 1486 Diag(MethodDecl->getLocation(), diag::note_previous_declaration); 1487 } 1488 } 1489 1490 void Sema::CheckConflictingOverridingMethod(ObjCMethodDecl *Method, 1491 ObjCMethodDecl *Overridden, 1492 bool IsProtocolMethodDecl) { 1493 1494 CheckMethodOverrideReturn(*this, Method, Overridden, 1495 IsProtocolMethodDecl, true, 1496 true); 1497 1498 for (ObjCMethodDecl::param_iterator IM = Method->param_begin(), 1499 IF = Overridden->param_begin(), EM = Method->param_end(), 1500 EF = Overridden->param_end(); 1501 IM != EM && IF != EF; ++IM, ++IF) { 1502 CheckMethodOverrideParam(*this, Method, Overridden, *IM, *IF, 1503 IsProtocolMethodDecl, true, true); 1504 } 1505 1506 if (Method->isVariadic() != Overridden->isVariadic()) { 1507 Diag(Method->getLocation(), 1508 diag::warn_conflicting_overriding_variadic); 1509 Diag(Overridden->getLocation(), diag::note_previous_declaration); 1510 } 1511 } 1512 1513 /// WarnExactTypedMethods - This routine issues a warning if method 1514 /// implementation declaration matches exactly that of its declaration. 1515 void Sema::WarnExactTypedMethods(ObjCMethodDecl *ImpMethodDecl, 1516 ObjCMethodDecl *MethodDecl, 1517 bool IsProtocolMethodDecl) { 1518 // don't issue warning when protocol method is optional because primary 1519 // class is not required to implement it and it is safe for protocol 1520 // to implement it. 1521 if (MethodDecl->getImplementationControl() == ObjCMethodDecl::Optional) 1522 return; 1523 // don't issue warning when primary class's method is 1524 // depecated/unavailable. 1525 if (MethodDecl->hasAttr<UnavailableAttr>() || 1526 MethodDecl->hasAttr<DeprecatedAttr>()) 1527 return; 1528 1529 bool match = CheckMethodOverrideReturn(*this, ImpMethodDecl, MethodDecl, 1530 IsProtocolMethodDecl, false, false); 1531 if (match) 1532 for (ObjCMethodDecl::param_iterator IM = ImpMethodDecl->param_begin(), 1533 IF = MethodDecl->param_begin(), EM = ImpMethodDecl->param_end(), 1534 EF = MethodDecl->param_end(); 1535 IM != EM && IF != EF; ++IM, ++IF) { 1536 match = CheckMethodOverrideParam(*this, ImpMethodDecl, MethodDecl, 1537 *IM, *IF, 1538 IsProtocolMethodDecl, false, false); 1539 if (!match) 1540 break; 1541 } 1542 if (match) 1543 match = (ImpMethodDecl->isVariadic() == MethodDecl->isVariadic()); 1544 if (match) 1545 match = !(MethodDecl->isClassMethod() && 1546 MethodDecl->getSelector() == GetNullarySelector("load", Context)); 1547 1548 if (match) { 1549 Diag(ImpMethodDecl->getLocation(), 1550 diag::warn_category_method_impl_match); 1551 Diag(MethodDecl->getLocation(), diag::note_method_declared_at) 1552 << MethodDecl->getDeclName(); 1553 } 1554 } 1555 1556 /// FIXME: Type hierarchies in Objective-C can be deep. We could most likely 1557 /// improve the efficiency of selector lookups and type checking by associating 1558 /// with each protocol / interface / category the flattened instance tables. If 1559 /// we used an immutable set to keep the table then it wouldn't add significant 1560 /// memory cost and it would be handy for lookups. 1561 1562 /// CheckProtocolMethodDefs - This routine checks unimplemented methods 1563 /// Declared in protocol, and those referenced by it. 1564 void Sema::CheckProtocolMethodDefs(SourceLocation ImpLoc, 1565 ObjCProtocolDecl *PDecl, 1566 bool& IncompleteImpl, 1567 const SelectorSet &InsMap, 1568 const SelectorSet &ClsMap, 1569 ObjCContainerDecl *CDecl) { 1570 ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl); 1571 ObjCInterfaceDecl *IDecl = C ? C->getClassInterface() 1572 : dyn_cast<ObjCInterfaceDecl>(CDecl); 1573 assert (IDecl && "CheckProtocolMethodDefs - IDecl is null"); 1574 1575 ObjCInterfaceDecl *Super = IDecl->getSuperClass(); 1576 ObjCInterfaceDecl *NSIDecl = 0; 1577 if (getLangOpts().ObjCRuntime.isNeXTFamily()) { 1578 // check to see if class implements forwardInvocation method and objects 1579 // of this class are derived from 'NSProxy' so that to forward requests 1580 // from one object to another. 1581 // Under such conditions, which means that every method possible is 1582 // implemented in the class, we should not issue "Method definition not 1583 // found" warnings. 1584 // FIXME: Use a general GetUnarySelector method for this. 1585 IdentifierInfo* II = &Context.Idents.get("forwardInvocation"); 1586 Selector fISelector = Context.Selectors.getSelector(1, &II); 1587 if (InsMap.count(fISelector)) 1588 // Is IDecl derived from 'NSProxy'? If so, no instance methods 1589 // need be implemented in the implementation. 1590 NSIDecl = IDecl->lookupInheritedClass(&Context.Idents.get("NSProxy")); 1591 } 1592 1593 // If this is a forward protocol declaration, get its definition. 1594 if (!PDecl->isThisDeclarationADefinition() && 1595 PDecl->getDefinition()) 1596 PDecl = PDecl->getDefinition(); 1597 1598 // If a method lookup fails locally we still need to look and see if 1599 // the method was implemented by a base class or an inherited 1600 // protocol. This lookup is slow, but occurs rarely in correct code 1601 // and otherwise would terminate in a warning. 1602 1603 // check unimplemented instance methods. 1604 if (!NSIDecl) 1605 for (ObjCProtocolDecl::instmeth_iterator I = PDecl->instmeth_begin(), 1606 E = PDecl->instmeth_end(); I != E; ++I) { 1607 ObjCMethodDecl *method = *I; 1608 if (method->getImplementationControl() != ObjCMethodDecl::Optional && 1609 !method->isPropertyAccessor() && 1610 !InsMap.count(method->getSelector()) && 1611 (!Super || !Super->lookupInstanceMethod(method->getSelector()))) { 1612 // If a method is not implemented in the category implementation but 1613 // has been declared in its primary class, superclass, 1614 // or in one of their protocols, no need to issue the warning. 1615 // This is because method will be implemented in the primary class 1616 // or one of its super class implementation. 1617 1618 // Ugly, but necessary. Method declared in protcol might have 1619 // have been synthesized due to a property declared in the class which 1620 // uses the protocol. 1621 if (ObjCMethodDecl *MethodInClass = 1622 IDecl->lookupInstanceMethod(method->getSelector(), 1623 true /*shallowCategoryLookup*/)) 1624 if (C || MethodInClass->isPropertyAccessor()) 1625 continue; 1626 unsigned DIAG = diag::warn_unimplemented_protocol_method; 1627 if (Diags.getDiagnosticLevel(DIAG, ImpLoc) 1628 != DiagnosticsEngine::Ignored) { 1629 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG); 1630 Diag(method->getLocation(), diag::note_method_declared_at) 1631 << method->getDeclName(); 1632 Diag(CDecl->getLocation(), diag::note_required_for_protocol_at) 1633 << PDecl->getDeclName(); 1634 } 1635 } 1636 } 1637 // check unimplemented class methods 1638 for (ObjCProtocolDecl::classmeth_iterator 1639 I = PDecl->classmeth_begin(), E = PDecl->classmeth_end(); 1640 I != E; ++I) { 1641 ObjCMethodDecl *method = *I; 1642 if (method->getImplementationControl() != ObjCMethodDecl::Optional && 1643 !ClsMap.count(method->getSelector()) && 1644 (!Super || !Super->lookupClassMethod(method->getSelector()))) { 1645 // See above comment for instance method lookups. 1646 if (C && IDecl->lookupClassMethod(method->getSelector(), 1647 true /*shallowCategoryLookup*/)) 1648 continue; 1649 unsigned DIAG = diag::warn_unimplemented_protocol_method; 1650 if (Diags.getDiagnosticLevel(DIAG, ImpLoc) != 1651 DiagnosticsEngine::Ignored) { 1652 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG); 1653 Diag(method->getLocation(), diag::note_method_declared_at) 1654 << method->getDeclName(); 1655 Diag(IDecl->getLocation(), diag::note_required_for_protocol_at) << 1656 PDecl->getDeclName(); 1657 } 1658 } 1659 } 1660 // Check on this protocols's referenced protocols, recursively. 1661 for (ObjCProtocolDecl::protocol_iterator PI = PDecl->protocol_begin(), 1662 E = PDecl->protocol_end(); PI != E; ++PI) 1663 CheckProtocolMethodDefs(ImpLoc, *PI, IncompleteImpl, InsMap, ClsMap, CDecl); 1664 } 1665 1666 /// MatchAllMethodDeclarations - Check methods declared in interface 1667 /// or protocol against those declared in their implementations. 1668 /// 1669 void Sema::MatchAllMethodDeclarations(const SelectorSet &InsMap, 1670 const SelectorSet &ClsMap, 1671 SelectorSet &InsMapSeen, 1672 SelectorSet &ClsMapSeen, 1673 ObjCImplDecl* IMPDecl, 1674 ObjCContainerDecl* CDecl, 1675 bool &IncompleteImpl, 1676 bool ImmediateClass, 1677 bool WarnCategoryMethodImpl) { 1678 // Check and see if instance methods in class interface have been 1679 // implemented in the implementation class. If so, their types match. 1680 for (ObjCInterfaceDecl::instmeth_iterator I = CDecl->instmeth_begin(), 1681 E = CDecl->instmeth_end(); I != E; ++I) { 1682 if (InsMapSeen.count((*I)->getSelector())) 1683 continue; 1684 InsMapSeen.insert((*I)->getSelector()); 1685 if (!(*I)->isPropertyAccessor() && 1686 !InsMap.count((*I)->getSelector())) { 1687 if (ImmediateClass) 1688 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl, 1689 diag::note_undef_method_impl); 1690 continue; 1691 } else { 1692 ObjCMethodDecl *ImpMethodDecl = 1693 IMPDecl->getInstanceMethod((*I)->getSelector()); 1694 assert(CDecl->getInstanceMethod((*I)->getSelector()) && 1695 "Expected to find the method through lookup as well"); 1696 ObjCMethodDecl *MethodDecl = *I; 1697 // ImpMethodDecl may be null as in a @dynamic property. 1698 if (ImpMethodDecl) { 1699 if (!WarnCategoryMethodImpl) 1700 WarnConflictingTypedMethods(ImpMethodDecl, MethodDecl, 1701 isa<ObjCProtocolDecl>(CDecl)); 1702 else if (!MethodDecl->isPropertyAccessor()) 1703 WarnExactTypedMethods(ImpMethodDecl, MethodDecl, 1704 isa<ObjCProtocolDecl>(CDecl)); 1705 } 1706 } 1707 } 1708 1709 // Check and see if class methods in class interface have been 1710 // implemented in the implementation class. If so, their types match. 1711 for (ObjCInterfaceDecl::classmeth_iterator 1712 I = CDecl->classmeth_begin(), E = CDecl->classmeth_end(); I != E; ++I) { 1713 if (ClsMapSeen.count((*I)->getSelector())) 1714 continue; 1715 ClsMapSeen.insert((*I)->getSelector()); 1716 if (!ClsMap.count((*I)->getSelector())) { 1717 if (ImmediateClass) 1718 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl, 1719 diag::note_undef_method_impl); 1720 } else { 1721 ObjCMethodDecl *ImpMethodDecl = 1722 IMPDecl->getClassMethod((*I)->getSelector()); 1723 assert(CDecl->getClassMethod((*I)->getSelector()) && 1724 "Expected to find the method through lookup as well"); 1725 ObjCMethodDecl *MethodDecl = *I; 1726 if (!WarnCategoryMethodImpl) 1727 WarnConflictingTypedMethods(ImpMethodDecl, MethodDecl, 1728 isa<ObjCProtocolDecl>(CDecl)); 1729 else 1730 WarnExactTypedMethods(ImpMethodDecl, MethodDecl, 1731 isa<ObjCProtocolDecl>(CDecl)); 1732 } 1733 } 1734 1735 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) { 1736 // when checking that methods in implementation match their declaration, 1737 // i.e. when WarnCategoryMethodImpl is false, check declarations in class 1738 // extension; as well as those in categories. 1739 if (!WarnCategoryMethodImpl) { 1740 for (ObjCInterfaceDecl::visible_categories_iterator 1741 Cat = I->visible_categories_begin(), 1742 CatEnd = I->visible_categories_end(); 1743 Cat != CatEnd; ++Cat) { 1744 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1745 IMPDecl, *Cat, IncompleteImpl, false, 1746 WarnCategoryMethodImpl); 1747 } 1748 } else { 1749 // Also methods in class extensions need be looked at next. 1750 for (ObjCInterfaceDecl::visible_extensions_iterator 1751 Ext = I->visible_extensions_begin(), 1752 ExtEnd = I->visible_extensions_end(); 1753 Ext != ExtEnd; ++Ext) { 1754 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1755 IMPDecl, *Ext, IncompleteImpl, false, 1756 WarnCategoryMethodImpl); 1757 } 1758 } 1759 1760 // Check for any implementation of a methods declared in protocol. 1761 for (ObjCInterfaceDecl::all_protocol_iterator 1762 PI = I->all_referenced_protocol_begin(), 1763 E = I->all_referenced_protocol_end(); PI != E; ++PI) 1764 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1765 IMPDecl, 1766 (*PI), IncompleteImpl, false, 1767 WarnCategoryMethodImpl); 1768 1769 // FIXME. For now, we are not checking for extact match of methods 1770 // in category implementation and its primary class's super class. 1771 if (!WarnCategoryMethodImpl && I->getSuperClass()) 1772 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1773 IMPDecl, 1774 I->getSuperClass(), IncompleteImpl, false); 1775 } 1776 } 1777 1778 /// CheckCategoryVsClassMethodMatches - Checks that methods implemented in 1779 /// category matches with those implemented in its primary class and 1780 /// warns each time an exact match is found. 1781 void Sema::CheckCategoryVsClassMethodMatches( 1782 ObjCCategoryImplDecl *CatIMPDecl) { 1783 SelectorSet InsMap, ClsMap; 1784 1785 for (ObjCImplementationDecl::instmeth_iterator 1786 I = CatIMPDecl->instmeth_begin(), 1787 E = CatIMPDecl->instmeth_end(); I!=E; ++I) 1788 InsMap.insert((*I)->getSelector()); 1789 1790 for (ObjCImplementationDecl::classmeth_iterator 1791 I = CatIMPDecl->classmeth_begin(), 1792 E = CatIMPDecl->classmeth_end(); I != E; ++I) 1793 ClsMap.insert((*I)->getSelector()); 1794 if (InsMap.empty() && ClsMap.empty()) 1795 return; 1796 1797 // Get category's primary class. 1798 ObjCCategoryDecl *CatDecl = CatIMPDecl->getCategoryDecl(); 1799 if (!CatDecl) 1800 return; 1801 ObjCInterfaceDecl *IDecl = CatDecl->getClassInterface(); 1802 if (!IDecl) 1803 return; 1804 SelectorSet InsMapSeen, ClsMapSeen; 1805 bool IncompleteImpl = false; 1806 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1807 CatIMPDecl, IDecl, 1808 IncompleteImpl, false, 1809 true /*WarnCategoryMethodImpl*/); 1810 } 1811 1812 void Sema::ImplMethodsVsClassMethods(Scope *S, ObjCImplDecl* IMPDecl, 1813 ObjCContainerDecl* CDecl, 1814 bool IncompleteImpl) { 1815 SelectorSet InsMap; 1816 // Check and see if instance methods in class interface have been 1817 // implemented in the implementation class. 1818 for (ObjCImplementationDecl::instmeth_iterator 1819 I = IMPDecl->instmeth_begin(), E = IMPDecl->instmeth_end(); I!=E; ++I) 1820 InsMap.insert((*I)->getSelector()); 1821 1822 // Check and see if properties declared in the interface have either 1) 1823 // an implementation or 2) there is a @synthesize/@dynamic implementation 1824 // of the property in the @implementation. 1825 if (const ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(CDecl)) 1826 if (!(LangOpts.ObjCDefaultSynthProperties && 1827 LangOpts.ObjCRuntime.isNonFragile()) || 1828 IDecl->isObjCRequiresPropertyDefs()) 1829 DiagnoseUnimplementedProperties(S, IMPDecl, CDecl, InsMap); 1830 1831 SelectorSet ClsMap; 1832 for (ObjCImplementationDecl::classmeth_iterator 1833 I = IMPDecl->classmeth_begin(), 1834 E = IMPDecl->classmeth_end(); I != E; ++I) 1835 ClsMap.insert((*I)->getSelector()); 1836 1837 // Check for type conflict of methods declared in a class/protocol and 1838 // its implementation; if any. 1839 SelectorSet InsMapSeen, ClsMapSeen; 1840 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1841 IMPDecl, CDecl, 1842 IncompleteImpl, true); 1843 1844 // check all methods implemented in category against those declared 1845 // in its primary class. 1846 if (ObjCCategoryImplDecl *CatDecl = 1847 dyn_cast<ObjCCategoryImplDecl>(IMPDecl)) 1848 CheckCategoryVsClassMethodMatches(CatDecl); 1849 1850 // Check the protocol list for unimplemented methods in the @implementation 1851 // class. 1852 // Check and see if class methods in class interface have been 1853 // implemented in the implementation class. 1854 1855 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) { 1856 for (ObjCInterfaceDecl::all_protocol_iterator 1857 PI = I->all_referenced_protocol_begin(), 1858 E = I->all_referenced_protocol_end(); PI != E; ++PI) 1859 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl, 1860 InsMap, ClsMap, I); 1861 // Check class extensions (unnamed categories) 1862 for (ObjCInterfaceDecl::visible_extensions_iterator 1863 Ext = I->visible_extensions_begin(), 1864 ExtEnd = I->visible_extensions_end(); 1865 Ext != ExtEnd; ++Ext) { 1866 ImplMethodsVsClassMethods(S, IMPDecl, *Ext, IncompleteImpl); 1867 } 1868 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl)) { 1869 // For extended class, unimplemented methods in its protocols will 1870 // be reported in the primary class. 1871 if (!C->IsClassExtension()) { 1872 for (ObjCCategoryDecl::protocol_iterator PI = C->protocol_begin(), 1873 E = C->protocol_end(); PI != E; ++PI) 1874 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl, 1875 InsMap, ClsMap, CDecl); 1876 // Report unimplemented properties in the category as well. 1877 // When reporting on missing setter/getters, do not report when 1878 // setter/getter is implemented in category's primary class 1879 // implementation. 1880 if (ObjCInterfaceDecl *ID = C->getClassInterface()) 1881 if (ObjCImplDecl *IMP = ID->getImplementation()) { 1882 for (ObjCImplementationDecl::instmeth_iterator 1883 I = IMP->instmeth_begin(), E = IMP->instmeth_end(); I!=E; ++I) 1884 InsMap.insert((*I)->getSelector()); 1885 } 1886 DiagnoseUnimplementedProperties(S, IMPDecl, CDecl, InsMap); 1887 } 1888 } else 1889 llvm_unreachable("invalid ObjCContainerDecl type."); 1890 } 1891 1892 /// ActOnForwardClassDeclaration - 1893 Sema::DeclGroupPtrTy 1894 Sema::ActOnForwardClassDeclaration(SourceLocation AtClassLoc, 1895 IdentifierInfo **IdentList, 1896 SourceLocation *IdentLocs, 1897 unsigned NumElts) { 1898 SmallVector<Decl *, 8> DeclsInGroup; 1899 for (unsigned i = 0; i != NumElts; ++i) { 1900 // Check for another declaration kind with the same name. 1901 NamedDecl *PrevDecl 1902 = LookupSingleName(TUScope, IdentList[i], IdentLocs[i], 1903 LookupOrdinaryName, ForRedeclaration); 1904 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1905 // Maybe we will complain about the shadowed template parameter. 1906 DiagnoseTemplateParameterShadow(AtClassLoc, PrevDecl); 1907 // Just pretend that we didn't see the previous declaration. 1908 PrevDecl = 0; 1909 } 1910 1911 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 1912 // GCC apparently allows the following idiom: 1913 // 1914 // typedef NSObject < XCElementTogglerP > XCElementToggler; 1915 // @class XCElementToggler; 1916 // 1917 // Here we have chosen to ignore the forward class declaration 1918 // with a warning. Since this is the implied behavior. 1919 TypedefNameDecl *TDD = dyn_cast<TypedefNameDecl>(PrevDecl); 1920 if (!TDD || !TDD->getUnderlyingType()->isObjCObjectType()) { 1921 Diag(AtClassLoc, diag::err_redefinition_different_kind) << IdentList[i]; 1922 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1923 } else { 1924 // a forward class declaration matching a typedef name of a class refers 1925 // to the underlying class. Just ignore the forward class with a warning 1926 // as this will force the intended behavior which is to lookup the typedef 1927 // name. 1928 if (isa<ObjCObjectType>(TDD->getUnderlyingType())) { 1929 Diag(AtClassLoc, diag::warn_forward_class_redefinition) << IdentList[i]; 1930 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1931 continue; 1932 } 1933 } 1934 } 1935 1936 // Create a declaration to describe this forward declaration. 1937 ObjCInterfaceDecl *PrevIDecl 1938 = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 1939 ObjCInterfaceDecl *IDecl 1940 = ObjCInterfaceDecl::Create(Context, CurContext, AtClassLoc, 1941 IdentList[i], PrevIDecl, IdentLocs[i]); 1942 IDecl->setAtEndRange(IdentLocs[i]); 1943 1944 PushOnScopeChains(IDecl, TUScope); 1945 CheckObjCDeclScope(IDecl); 1946 DeclsInGroup.push_back(IDecl); 1947 } 1948 1949 return BuildDeclaratorGroup(DeclsInGroup.data(), DeclsInGroup.size(), false); 1950 } 1951 1952 static bool tryMatchRecordTypes(ASTContext &Context, 1953 Sema::MethodMatchStrategy strategy, 1954 const Type *left, const Type *right); 1955 1956 static bool matchTypes(ASTContext &Context, Sema::MethodMatchStrategy strategy, 1957 QualType leftQT, QualType rightQT) { 1958 const Type *left = 1959 Context.getCanonicalType(leftQT).getUnqualifiedType().getTypePtr(); 1960 const Type *right = 1961 Context.getCanonicalType(rightQT).getUnqualifiedType().getTypePtr(); 1962 1963 if (left == right) return true; 1964 1965 // If we're doing a strict match, the types have to match exactly. 1966 if (strategy == Sema::MMS_strict) return false; 1967 1968 if (left->isIncompleteType() || right->isIncompleteType()) return false; 1969 1970 // Otherwise, use this absurdly complicated algorithm to try to 1971 // validate the basic, low-level compatibility of the two types. 1972 1973 // As a minimum, require the sizes and alignments to match. 1974 if (Context.getTypeInfo(left) != Context.getTypeInfo(right)) 1975 return false; 1976 1977 // Consider all the kinds of non-dependent canonical types: 1978 // - functions and arrays aren't possible as return and parameter types 1979 1980 // - vector types of equal size can be arbitrarily mixed 1981 if (isa<VectorType>(left)) return isa<VectorType>(right); 1982 if (isa<VectorType>(right)) return false; 1983 1984 // - references should only match references of identical type 1985 // - structs, unions, and Objective-C objects must match more-or-less 1986 // exactly 1987 // - everything else should be a scalar 1988 if (!left->isScalarType() || !right->isScalarType()) 1989 return tryMatchRecordTypes(Context, strategy, left, right); 1990 1991 // Make scalars agree in kind, except count bools as chars, and group 1992 // all non-member pointers together. 1993 Type::ScalarTypeKind leftSK = left->getScalarTypeKind(); 1994 Type::ScalarTypeKind rightSK = right->getScalarTypeKind(); 1995 if (leftSK == Type::STK_Bool) leftSK = Type::STK_Integral; 1996 if (rightSK == Type::STK_Bool) rightSK = Type::STK_Integral; 1997 if (leftSK == Type::STK_CPointer || leftSK == Type::STK_BlockPointer) 1998 leftSK = Type::STK_ObjCObjectPointer; 1999 if (rightSK == Type::STK_CPointer || rightSK == Type::STK_BlockPointer) 2000 rightSK = Type::STK_ObjCObjectPointer; 2001 2002 // Note that data member pointers and function member pointers don't 2003 // intermix because of the size differences. 2004 2005 return (leftSK == rightSK); 2006 } 2007 2008 static bool tryMatchRecordTypes(ASTContext &Context, 2009 Sema::MethodMatchStrategy strategy, 2010 const Type *lt, const Type *rt) { 2011 assert(lt && rt && lt != rt); 2012 2013 if (!isa<RecordType>(lt) || !isa<RecordType>(rt)) return false; 2014 RecordDecl *left = cast<RecordType>(lt)->getDecl(); 2015 RecordDecl *right = cast<RecordType>(rt)->getDecl(); 2016 2017 // Require union-hood to match. 2018 if (left->isUnion() != right->isUnion()) return false; 2019 2020 // Require an exact match if either is non-POD. 2021 if ((isa<CXXRecordDecl>(left) && !cast<CXXRecordDecl>(left)->isPOD()) || 2022 (isa<CXXRecordDecl>(right) && !cast<CXXRecordDecl>(right)->isPOD())) 2023 return false; 2024 2025 // Require size and alignment to match. 2026 if (Context.getTypeInfo(lt) != Context.getTypeInfo(rt)) return false; 2027 2028 // Require fields to match. 2029 RecordDecl::field_iterator li = left->field_begin(), le = left->field_end(); 2030 RecordDecl::field_iterator ri = right->field_begin(), re = right->field_end(); 2031 for (; li != le && ri != re; ++li, ++ri) { 2032 if (!matchTypes(Context, strategy, li->getType(), ri->getType())) 2033 return false; 2034 } 2035 return (li == le && ri == re); 2036 } 2037 2038 /// MatchTwoMethodDeclarations - Checks that two methods have matching type and 2039 /// returns true, or false, accordingly. 2040 /// TODO: Handle protocol list; such as id<p1,p2> in type comparisons 2041 bool Sema::MatchTwoMethodDeclarations(const ObjCMethodDecl *left, 2042 const ObjCMethodDecl *right, 2043 MethodMatchStrategy strategy) { 2044 if (!matchTypes(Context, strategy, 2045 left->getResultType(), right->getResultType())) 2046 return false; 2047 2048 // If either is hidden, it is not considered to match. 2049 if (left->isHidden() || right->isHidden()) 2050 return false; 2051 2052 if (getLangOpts().ObjCAutoRefCount && 2053 (left->hasAttr<NSReturnsRetainedAttr>() 2054 != right->hasAttr<NSReturnsRetainedAttr>() || 2055 left->hasAttr<NSConsumesSelfAttr>() 2056 != right->hasAttr<NSConsumesSelfAttr>())) 2057 return false; 2058 2059 ObjCMethodDecl::param_const_iterator 2060 li = left->param_begin(), le = left->param_end(), ri = right->param_begin(), 2061 re = right->param_end(); 2062 2063 for (; li != le && ri != re; ++li, ++ri) { 2064 assert(ri != right->param_end() && "Param mismatch"); 2065 const ParmVarDecl *lparm = *li, *rparm = *ri; 2066 2067 if (!matchTypes(Context, strategy, lparm->getType(), rparm->getType())) 2068 return false; 2069 2070 if (getLangOpts().ObjCAutoRefCount && 2071 lparm->hasAttr<NSConsumedAttr>() != rparm->hasAttr<NSConsumedAttr>()) 2072 return false; 2073 } 2074 return true; 2075 } 2076 2077 void Sema::addMethodToGlobalList(ObjCMethodList *List, ObjCMethodDecl *Method) { 2078 // If the list is empty, make it a singleton list. 2079 if (List->Method == 0) { 2080 List->Method = Method; 2081 List->Next = 0; 2082 return; 2083 } 2084 2085 // We've seen a method with this name, see if we have already seen this type 2086 // signature. 2087 ObjCMethodList *Previous = List; 2088 for (; List; Previous = List, List = List->Next) { 2089 if (!MatchTwoMethodDeclarations(Method, List->Method)) 2090 continue; 2091 2092 ObjCMethodDecl *PrevObjCMethod = List->Method; 2093 2094 // Propagate the 'defined' bit. 2095 if (Method->isDefined()) 2096 PrevObjCMethod->setDefined(true); 2097 2098 // If a method is deprecated, push it in the global pool. 2099 // This is used for better diagnostics. 2100 if (Method->isDeprecated()) { 2101 if (!PrevObjCMethod->isDeprecated()) 2102 List->Method = Method; 2103 } 2104 // If new method is unavailable, push it into global pool 2105 // unless previous one is deprecated. 2106 if (Method->isUnavailable()) { 2107 if (PrevObjCMethod->getAvailability() < AR_Deprecated) 2108 List->Method = Method; 2109 } 2110 2111 return; 2112 } 2113 2114 // We have a new signature for an existing method - add it. 2115 // This is extremely rare. Only 1% of Cocoa selectors are "overloaded". 2116 ObjCMethodList *Mem = BumpAlloc.Allocate<ObjCMethodList>(); 2117 Previous->Next = new (Mem) ObjCMethodList(Method, 0); 2118 } 2119 2120 /// \brief Read the contents of the method pool for a given selector from 2121 /// external storage. 2122 void Sema::ReadMethodPool(Selector Sel) { 2123 assert(ExternalSource && "We need an external AST source"); 2124 ExternalSource->ReadMethodPool(Sel); 2125 } 2126 2127 void Sema::AddMethodToGlobalPool(ObjCMethodDecl *Method, bool impl, 2128 bool instance) { 2129 // Ignore methods of invalid containers. 2130 if (cast<Decl>(Method->getDeclContext())->isInvalidDecl()) 2131 return; 2132 2133 if (ExternalSource) 2134 ReadMethodPool(Method->getSelector()); 2135 2136 GlobalMethodPool::iterator Pos = MethodPool.find(Method->getSelector()); 2137 if (Pos == MethodPool.end()) 2138 Pos = MethodPool.insert(std::make_pair(Method->getSelector(), 2139 GlobalMethods())).first; 2140 2141 Method->setDefined(impl); 2142 2143 ObjCMethodList &Entry = instance ? Pos->second.first : Pos->second.second; 2144 addMethodToGlobalList(&Entry, Method); 2145 } 2146 2147 /// Determines if this is an "acceptable" loose mismatch in the global 2148 /// method pool. This exists mostly as a hack to get around certain 2149 /// global mismatches which we can't afford to make warnings / errors. 2150 /// Really, what we want is a way to take a method out of the global 2151 /// method pool. 2152 static bool isAcceptableMethodMismatch(ObjCMethodDecl *chosen, 2153 ObjCMethodDecl *other) { 2154 if (!chosen->isInstanceMethod()) 2155 return false; 2156 2157 Selector sel = chosen->getSelector(); 2158 if (!sel.isUnarySelector() || sel.getNameForSlot(0) != "length") 2159 return false; 2160 2161 // Don't complain about mismatches for -length if the method we 2162 // chose has an integral result type. 2163 return (chosen->getResultType()->isIntegerType()); 2164 } 2165 2166 ObjCMethodDecl *Sema::LookupMethodInGlobalPool(Selector Sel, SourceRange R, 2167 bool receiverIdOrClass, 2168 bool warn, bool instance) { 2169 if (ExternalSource) 2170 ReadMethodPool(Sel); 2171 2172 GlobalMethodPool::iterator Pos = MethodPool.find(Sel); 2173 if (Pos == MethodPool.end()) 2174 return 0; 2175 2176 // Gather the non-hidden methods. 2177 ObjCMethodList &MethList = instance ? Pos->second.first : Pos->second.second; 2178 llvm::SmallVector<ObjCMethodDecl *, 4> Methods; 2179 for (ObjCMethodList *M = &MethList; M; M = M->Next) { 2180 if (M->Method && !M->Method->isHidden()) { 2181 // If we're not supposed to warn about mismatches, we're done. 2182 if (!warn) 2183 return M->Method; 2184 2185 Methods.push_back(M->Method); 2186 } 2187 } 2188 2189 // If there aren't any visible methods, we're done. 2190 // FIXME: Recover if there are any known-but-hidden methods? 2191 if (Methods.empty()) 2192 return 0; 2193 2194 if (Methods.size() == 1) 2195 return Methods[0]; 2196 2197 // We found multiple methods, so we may have to complain. 2198 bool issueDiagnostic = false, issueError = false; 2199 2200 // We support a warning which complains about *any* difference in 2201 // method signature. 2202 bool strictSelectorMatch = 2203 (receiverIdOrClass && warn && 2204 (Diags.getDiagnosticLevel(diag::warn_strict_multiple_method_decl, 2205 R.getBegin()) 2206 != DiagnosticsEngine::Ignored)); 2207 if (strictSelectorMatch) { 2208 for (unsigned I = 1, N = Methods.size(); I != N; ++I) { 2209 if (!MatchTwoMethodDeclarations(Methods[0], Methods[I], MMS_strict)) { 2210 issueDiagnostic = true; 2211 break; 2212 } 2213 } 2214 } 2215 2216 // If we didn't see any strict differences, we won't see any loose 2217 // differences. In ARC, however, we also need to check for loose 2218 // mismatches, because most of them are errors. 2219 if (!strictSelectorMatch || 2220 (issueDiagnostic && getLangOpts().ObjCAutoRefCount)) 2221 for (unsigned I = 1, N = Methods.size(); I != N; ++I) { 2222 // This checks if the methods differ in type mismatch. 2223 if (!MatchTwoMethodDeclarations(Methods[0], Methods[I], MMS_loose) && 2224 !isAcceptableMethodMismatch(Methods[0], Methods[I])) { 2225 issueDiagnostic = true; 2226 if (getLangOpts().ObjCAutoRefCount) 2227 issueError = true; 2228 break; 2229 } 2230 } 2231 2232 if (issueDiagnostic) { 2233 if (issueError) 2234 Diag(R.getBegin(), diag::err_arc_multiple_method_decl) << Sel << R; 2235 else if (strictSelectorMatch) 2236 Diag(R.getBegin(), diag::warn_strict_multiple_method_decl) << Sel << R; 2237 else 2238 Diag(R.getBegin(), diag::warn_multiple_method_decl) << Sel << R; 2239 2240 Diag(Methods[0]->getLocStart(), 2241 issueError ? diag::note_possibility : diag::note_using) 2242 << Methods[0]->getSourceRange(); 2243 for (unsigned I = 1, N = Methods.size(); I != N; ++I) { 2244 Diag(Methods[I]->getLocStart(), diag::note_also_found) 2245 << Methods[I]->getSourceRange(); 2246 } 2247 } 2248 return Methods[0]; 2249 } 2250 2251 ObjCMethodDecl *Sema::LookupImplementedMethodInGlobalPool(Selector Sel) { 2252 GlobalMethodPool::iterator Pos = MethodPool.find(Sel); 2253 if (Pos == MethodPool.end()) 2254 return 0; 2255 2256 GlobalMethods &Methods = Pos->second; 2257 2258 if (Methods.first.Method && Methods.first.Method->isDefined()) 2259 return Methods.first.Method; 2260 if (Methods.second.Method && Methods.second.Method->isDefined()) 2261 return Methods.second.Method; 2262 return 0; 2263 } 2264 2265 /// DiagnoseDuplicateIvars - 2266 /// Check for duplicate ivars in the entire class at the start of 2267 /// \@implementation. This becomes necesssary because class extension can 2268 /// add ivars to a class in random order which will not be known until 2269 /// class's \@implementation is seen. 2270 void Sema::DiagnoseDuplicateIvars(ObjCInterfaceDecl *ID, 2271 ObjCInterfaceDecl *SID) { 2272 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 2273 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 2274 ObjCIvarDecl* Ivar = *IVI; 2275 if (Ivar->isInvalidDecl()) 2276 continue; 2277 if (IdentifierInfo *II = Ivar->getIdentifier()) { 2278 ObjCIvarDecl* prevIvar = SID->lookupInstanceVariable(II); 2279 if (prevIvar) { 2280 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 2281 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 2282 Ivar->setInvalidDecl(); 2283 } 2284 } 2285 } 2286 } 2287 2288 Sema::ObjCContainerKind Sema::getObjCContainerKind() const { 2289 switch (CurContext->getDeclKind()) { 2290 case Decl::ObjCInterface: 2291 return Sema::OCK_Interface; 2292 case Decl::ObjCProtocol: 2293 return Sema::OCK_Protocol; 2294 case Decl::ObjCCategory: 2295 if (dyn_cast<ObjCCategoryDecl>(CurContext)->IsClassExtension()) 2296 return Sema::OCK_ClassExtension; 2297 else 2298 return Sema::OCK_Category; 2299 case Decl::ObjCImplementation: 2300 return Sema::OCK_Implementation; 2301 case Decl::ObjCCategoryImpl: 2302 return Sema::OCK_CategoryImplementation; 2303 2304 default: 2305 return Sema::OCK_None; 2306 } 2307 } 2308 2309 // Note: For class/category implemenations, allMethods/allProperties is 2310 // always null. 2311 Decl *Sema::ActOnAtEnd(Scope *S, SourceRange AtEnd, 2312 Decl **allMethods, unsigned allNum, 2313 Decl **allProperties, unsigned pNum, 2314 DeclGroupPtrTy *allTUVars, unsigned tuvNum) { 2315 2316 if (getObjCContainerKind() == Sema::OCK_None) 2317 return 0; 2318 2319 assert(AtEnd.isValid() && "Invalid location for '@end'"); 2320 2321 ObjCContainerDecl *OCD = dyn_cast<ObjCContainerDecl>(CurContext); 2322 Decl *ClassDecl = cast<Decl>(OCD); 2323 2324 bool isInterfaceDeclKind = 2325 isa<ObjCInterfaceDecl>(ClassDecl) || isa<ObjCCategoryDecl>(ClassDecl) 2326 || isa<ObjCProtocolDecl>(ClassDecl); 2327 bool checkIdenticalMethods = isa<ObjCImplementationDecl>(ClassDecl); 2328 2329 // FIXME: Remove these and use the ObjCContainerDecl/DeclContext. 2330 llvm::DenseMap<Selector, const ObjCMethodDecl*> InsMap; 2331 llvm::DenseMap<Selector, const ObjCMethodDecl*> ClsMap; 2332 2333 for (unsigned i = 0; i < allNum; i++ ) { 2334 ObjCMethodDecl *Method = 2335 cast_or_null<ObjCMethodDecl>(allMethods[i]); 2336 2337 if (!Method) continue; // Already issued a diagnostic. 2338 if (Method->isInstanceMethod()) { 2339 /// Check for instance method of the same name with incompatible types 2340 const ObjCMethodDecl *&PrevMethod = InsMap[Method->getSelector()]; 2341 bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod) 2342 : false; 2343 if ((isInterfaceDeclKind && PrevMethod && !match) 2344 || (checkIdenticalMethods && match)) { 2345 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 2346 << Method->getDeclName(); 2347 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 2348 Method->setInvalidDecl(); 2349 } else { 2350 if (PrevMethod) { 2351 Method->setAsRedeclaration(PrevMethod); 2352 if (!Context.getSourceManager().isInSystemHeader( 2353 Method->getLocation())) 2354 Diag(Method->getLocation(), diag::warn_duplicate_method_decl) 2355 << Method->getDeclName(); 2356 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 2357 } 2358 InsMap[Method->getSelector()] = Method; 2359 /// The following allows us to typecheck messages to "id". 2360 AddInstanceMethodToGlobalPool(Method); 2361 } 2362 } else { 2363 /// Check for class method of the same name with incompatible types 2364 const ObjCMethodDecl *&PrevMethod = ClsMap[Method->getSelector()]; 2365 bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod) 2366 : false; 2367 if ((isInterfaceDeclKind && PrevMethod && !match) 2368 || (checkIdenticalMethods && match)) { 2369 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 2370 << Method->getDeclName(); 2371 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 2372 Method->setInvalidDecl(); 2373 } else { 2374 if (PrevMethod) { 2375 Method->setAsRedeclaration(PrevMethod); 2376 if (!Context.getSourceManager().isInSystemHeader( 2377 Method->getLocation())) 2378 Diag(Method->getLocation(), diag::warn_duplicate_method_decl) 2379 << Method->getDeclName(); 2380 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 2381 } 2382 ClsMap[Method->getSelector()] = Method; 2383 AddFactoryMethodToGlobalPool(Method); 2384 } 2385 } 2386 } 2387 if (isa<ObjCInterfaceDecl>(ClassDecl)) { 2388 // Nothing to do here. 2389 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(ClassDecl)) { 2390 // Categories are used to extend the class by declaring new methods. 2391 // By the same token, they are also used to add new properties. No 2392 // need to compare the added property to those in the class. 2393 2394 if (C->IsClassExtension()) { 2395 ObjCInterfaceDecl *CCPrimary = C->getClassInterface(); 2396 DiagnoseClassExtensionDupMethods(C, CCPrimary); 2397 } 2398 } 2399 if (ObjCContainerDecl *CDecl = dyn_cast<ObjCContainerDecl>(ClassDecl)) { 2400 if (CDecl->getIdentifier()) 2401 // ProcessPropertyDecl is responsible for diagnosing conflicts with any 2402 // user-defined setter/getter. It also synthesizes setter/getter methods 2403 // and adds them to the DeclContext and global method pools. 2404 for (ObjCContainerDecl::prop_iterator I = CDecl->prop_begin(), 2405 E = CDecl->prop_end(); 2406 I != E; ++I) 2407 ProcessPropertyDecl(*I, CDecl); 2408 CDecl->setAtEndRange(AtEnd); 2409 } 2410 if (ObjCImplementationDecl *IC=dyn_cast<ObjCImplementationDecl>(ClassDecl)) { 2411 IC->setAtEndRange(AtEnd); 2412 if (ObjCInterfaceDecl* IDecl = IC->getClassInterface()) { 2413 // Any property declared in a class extension might have user 2414 // declared setter or getter in current class extension or one 2415 // of the other class extensions. Mark them as synthesized as 2416 // property will be synthesized when property with same name is 2417 // seen in the @implementation. 2418 for (ObjCInterfaceDecl::visible_extensions_iterator 2419 Ext = IDecl->visible_extensions_begin(), 2420 ExtEnd = IDecl->visible_extensions_end(); 2421 Ext != ExtEnd; ++Ext) { 2422 for (ObjCContainerDecl::prop_iterator I = Ext->prop_begin(), 2423 E = Ext->prop_end(); I != E; ++I) { 2424 ObjCPropertyDecl *Property = *I; 2425 // Skip over properties declared @dynamic 2426 if (const ObjCPropertyImplDecl *PIDecl 2427 = IC->FindPropertyImplDecl(Property->getIdentifier())) 2428 if (PIDecl->getPropertyImplementation() 2429 == ObjCPropertyImplDecl::Dynamic) 2430 continue; 2431 2432 for (ObjCInterfaceDecl::visible_extensions_iterator 2433 Ext = IDecl->visible_extensions_begin(), 2434 ExtEnd = IDecl->visible_extensions_end(); 2435 Ext != ExtEnd; ++Ext) { 2436 if (ObjCMethodDecl *GetterMethod 2437 = Ext->getInstanceMethod(Property->getGetterName())) 2438 GetterMethod->setPropertyAccessor(true); 2439 if (!Property->isReadOnly()) 2440 if (ObjCMethodDecl *SetterMethod 2441 = Ext->getInstanceMethod(Property->getSetterName())) 2442 SetterMethod->setPropertyAccessor(true); 2443 } 2444 } 2445 } 2446 ImplMethodsVsClassMethods(S, IC, IDecl); 2447 AtomicPropertySetterGetterRules(IC, IDecl); 2448 DiagnoseOwningPropertyGetterSynthesis(IC); 2449 2450 bool HasRootClassAttr = IDecl->hasAttr<ObjCRootClassAttr>(); 2451 if (IDecl->getSuperClass() == NULL) { 2452 // This class has no superclass, so check that it has been marked with 2453 // __attribute((objc_root_class)). 2454 if (!HasRootClassAttr) { 2455 SourceLocation DeclLoc(IDecl->getLocation()); 2456 SourceLocation SuperClassLoc(PP.getLocForEndOfToken(DeclLoc)); 2457 Diag(DeclLoc, diag::warn_objc_root_class_missing) 2458 << IDecl->getIdentifier(); 2459 // See if NSObject is in the current scope, and if it is, suggest 2460 // adding " : NSObject " to the class declaration. 2461 NamedDecl *IF = LookupSingleName(TUScope, 2462 NSAPIObj->getNSClassId(NSAPI::ClassId_NSObject), 2463 DeclLoc, LookupOrdinaryName); 2464 ObjCInterfaceDecl *NSObjectDecl = dyn_cast_or_null<ObjCInterfaceDecl>(IF); 2465 if (NSObjectDecl && NSObjectDecl->getDefinition()) { 2466 Diag(SuperClassLoc, diag::note_objc_needs_superclass) 2467 << FixItHint::CreateInsertion(SuperClassLoc, " : NSObject "); 2468 } else { 2469 Diag(SuperClassLoc, diag::note_objc_needs_superclass); 2470 } 2471 } 2472 } else if (HasRootClassAttr) { 2473 // Complain that only root classes may have this attribute. 2474 Diag(IDecl->getLocation(), diag::err_objc_root_class_subclass); 2475 } 2476 2477 if (LangOpts.ObjCRuntime.isNonFragile()) { 2478 while (IDecl->getSuperClass()) { 2479 DiagnoseDuplicateIvars(IDecl, IDecl->getSuperClass()); 2480 IDecl = IDecl->getSuperClass(); 2481 } 2482 } 2483 } 2484 SetIvarInitializers(IC); 2485 } else if (ObjCCategoryImplDecl* CatImplClass = 2486 dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) { 2487 CatImplClass->setAtEndRange(AtEnd); 2488 2489 // Find category interface decl and then check that all methods declared 2490 // in this interface are implemented in the category @implementation. 2491 if (ObjCInterfaceDecl* IDecl = CatImplClass->getClassInterface()) { 2492 if (ObjCCategoryDecl *Cat 2493 = IDecl->FindCategoryDeclaration(CatImplClass->getIdentifier())) { 2494 ImplMethodsVsClassMethods(S, CatImplClass, Cat); 2495 } 2496 } 2497 } 2498 if (isInterfaceDeclKind) { 2499 // Reject invalid vardecls. 2500 for (unsigned i = 0; i != tuvNum; i++) { 2501 DeclGroupRef DG = allTUVars[i].getAsVal<DeclGroupRef>(); 2502 for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I) 2503 if (VarDecl *VDecl = dyn_cast<VarDecl>(*I)) { 2504 if (!VDecl->hasExternalStorage()) 2505 Diag(VDecl->getLocation(), diag::err_objc_var_decl_inclass); 2506 } 2507 } 2508 } 2509 ActOnObjCContainerFinishDefinition(); 2510 2511 for (unsigned i = 0; i != tuvNum; i++) { 2512 DeclGroupRef DG = allTUVars[i].getAsVal<DeclGroupRef>(); 2513 for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I) 2514 (*I)->setTopLevelDeclInObjCContainer(); 2515 Consumer.HandleTopLevelDeclInObjCContainer(DG); 2516 } 2517 2518 ActOnDocumentableDecl(ClassDecl); 2519 return ClassDecl; 2520 } 2521 2522 2523 /// CvtQTToAstBitMask - utility routine to produce an AST bitmask for 2524 /// objective-c's type qualifier from the parser version of the same info. 2525 static Decl::ObjCDeclQualifier 2526 CvtQTToAstBitMask(ObjCDeclSpec::ObjCDeclQualifier PQTVal) { 2527 return (Decl::ObjCDeclQualifier) (unsigned) PQTVal; 2528 } 2529 2530 static inline 2531 unsigned countAlignAttr(const AttrVec &A) { 2532 unsigned count=0; 2533 for (AttrVec::const_iterator i = A.begin(), e = A.end(); i != e; ++i) 2534 if ((*i)->getKind() == attr::Aligned) 2535 ++count; 2536 return count; 2537 } 2538 2539 static inline 2540 bool containsInvalidMethodImplAttribute(ObjCMethodDecl *IMD, 2541 const AttrVec &A) { 2542 // If method is only declared in implementation (private method), 2543 // No need to issue any diagnostics on method definition with attributes. 2544 if (!IMD) 2545 return false; 2546 2547 // method declared in interface has no attribute. 2548 // But implementation has attributes. This is invalid. 2549 // Except when implementation has 'Align' attribute which is 2550 // immaterial to method declared in interface. 2551 if (!IMD->hasAttrs()) 2552 return (A.size() > countAlignAttr(A)); 2553 2554 const AttrVec &D = IMD->getAttrs(); 2555 2556 unsigned countAlignOnImpl = countAlignAttr(A); 2557 if (!countAlignOnImpl && (A.size() != D.size())) 2558 return true; 2559 else if (countAlignOnImpl) { 2560 unsigned countAlignOnDecl = countAlignAttr(D); 2561 if (countAlignOnDecl && (A.size() != D.size())) 2562 return true; 2563 else if (!countAlignOnDecl && 2564 ((A.size()-countAlignOnImpl) != D.size())) 2565 return true; 2566 } 2567 2568 // attributes on method declaration and definition must match exactly. 2569 // Note that we have at most a couple of attributes on methods, so this 2570 // n*n search is good enough. 2571 for (AttrVec::const_iterator i = A.begin(), e = A.end(); i != e; ++i) { 2572 if ((*i)->getKind() == attr::Aligned) 2573 continue; 2574 bool match = false; 2575 for (AttrVec::const_iterator i1 = D.begin(), e1 = D.end(); i1 != e1; ++i1) { 2576 if ((*i)->getKind() == (*i1)->getKind()) { 2577 match = true; 2578 break; 2579 } 2580 } 2581 if (!match) 2582 return true; 2583 } 2584 2585 return false; 2586 } 2587 2588 /// \brief Check whether the declared result type of the given Objective-C 2589 /// method declaration is compatible with the method's class. 2590 /// 2591 static Sema::ResultTypeCompatibilityKind 2592 CheckRelatedResultTypeCompatibility(Sema &S, ObjCMethodDecl *Method, 2593 ObjCInterfaceDecl *CurrentClass) { 2594 QualType ResultType = Method->getResultType(); 2595 2596 // If an Objective-C method inherits its related result type, then its 2597 // declared result type must be compatible with its own class type. The 2598 // declared result type is compatible if: 2599 if (const ObjCObjectPointerType *ResultObjectType 2600 = ResultType->getAs<ObjCObjectPointerType>()) { 2601 // - it is id or qualified id, or 2602 if (ResultObjectType->isObjCIdType() || 2603 ResultObjectType->isObjCQualifiedIdType()) 2604 return Sema::RTC_Compatible; 2605 2606 if (CurrentClass) { 2607 if (ObjCInterfaceDecl *ResultClass 2608 = ResultObjectType->getInterfaceDecl()) { 2609 // - it is the same as the method's class type, or 2610 if (declaresSameEntity(CurrentClass, ResultClass)) 2611 return Sema::RTC_Compatible; 2612 2613 // - it is a superclass of the method's class type 2614 if (ResultClass->isSuperClassOf(CurrentClass)) 2615 return Sema::RTC_Compatible; 2616 } 2617 } else { 2618 // Any Objective-C pointer type might be acceptable for a protocol 2619 // method; we just don't know. 2620 return Sema::RTC_Unknown; 2621 } 2622 } 2623 2624 return Sema::RTC_Incompatible; 2625 } 2626 2627 namespace { 2628 /// A helper class for searching for methods which a particular method 2629 /// overrides. 2630 class OverrideSearch { 2631 public: 2632 Sema &S; 2633 ObjCMethodDecl *Method; 2634 llvm::SmallPtrSet<ObjCMethodDecl*, 4> Overridden; 2635 bool Recursive; 2636 2637 public: 2638 OverrideSearch(Sema &S, ObjCMethodDecl *method) : S(S), Method(method) { 2639 Selector selector = method->getSelector(); 2640 2641 // Bypass this search if we've never seen an instance/class method 2642 // with this selector before. 2643 Sema::GlobalMethodPool::iterator it = S.MethodPool.find(selector); 2644 if (it == S.MethodPool.end()) { 2645 if (!S.getExternalSource()) return; 2646 S.ReadMethodPool(selector); 2647 2648 it = S.MethodPool.find(selector); 2649 if (it == S.MethodPool.end()) 2650 return; 2651 } 2652 ObjCMethodList &list = 2653 method->isInstanceMethod() ? it->second.first : it->second.second; 2654 if (!list.Method) return; 2655 2656 ObjCContainerDecl *container 2657 = cast<ObjCContainerDecl>(method->getDeclContext()); 2658 2659 // Prevent the search from reaching this container again. This is 2660 // important with categories, which override methods from the 2661 // interface and each other. 2662 if (ObjCCategoryDecl *Category = dyn_cast<ObjCCategoryDecl>(container)) { 2663 searchFromContainer(container); 2664 if (ObjCInterfaceDecl *Interface = Category->getClassInterface()) 2665 searchFromContainer(Interface); 2666 } else { 2667 searchFromContainer(container); 2668 } 2669 } 2670 2671 typedef llvm::SmallPtrSet<ObjCMethodDecl*, 128>::iterator iterator; 2672 iterator begin() const { return Overridden.begin(); } 2673 iterator end() const { return Overridden.end(); } 2674 2675 private: 2676 void searchFromContainer(ObjCContainerDecl *container) { 2677 if (container->isInvalidDecl()) return; 2678 2679 switch (container->getDeclKind()) { 2680 #define OBJCCONTAINER(type, base) \ 2681 case Decl::type: \ 2682 searchFrom(cast<type##Decl>(container)); \ 2683 break; 2684 #define ABSTRACT_DECL(expansion) 2685 #define DECL(type, base) \ 2686 case Decl::type: 2687 #include "clang/AST/DeclNodes.inc" 2688 llvm_unreachable("not an ObjC container!"); 2689 } 2690 } 2691 2692 void searchFrom(ObjCProtocolDecl *protocol) { 2693 if (!protocol->hasDefinition()) 2694 return; 2695 2696 // A method in a protocol declaration overrides declarations from 2697 // referenced ("parent") protocols. 2698 search(protocol->getReferencedProtocols()); 2699 } 2700 2701 void searchFrom(ObjCCategoryDecl *category) { 2702 // A method in a category declaration overrides declarations from 2703 // the main class and from protocols the category references. 2704 // The main class is handled in the constructor. 2705 search(category->getReferencedProtocols()); 2706 } 2707 2708 void searchFrom(ObjCCategoryImplDecl *impl) { 2709 // A method in a category definition that has a category 2710 // declaration overrides declarations from the category 2711 // declaration. 2712 if (ObjCCategoryDecl *category = impl->getCategoryDecl()) { 2713 search(category); 2714 if (ObjCInterfaceDecl *Interface = category->getClassInterface()) 2715 search(Interface); 2716 2717 // Otherwise it overrides declarations from the class. 2718 } else if (ObjCInterfaceDecl *Interface = impl->getClassInterface()) { 2719 search(Interface); 2720 } 2721 } 2722 2723 void searchFrom(ObjCInterfaceDecl *iface) { 2724 // A method in a class declaration overrides declarations from 2725 if (!iface->hasDefinition()) 2726 return; 2727 2728 // - categories, 2729 for (ObjCInterfaceDecl::visible_categories_iterator 2730 cat = iface->visible_categories_begin(), 2731 catEnd = iface->visible_categories_end(); 2732 cat != catEnd; ++cat) { 2733 search(*cat); 2734 } 2735 2736 // - the super class, and 2737 if (ObjCInterfaceDecl *super = iface->getSuperClass()) 2738 search(super); 2739 2740 // - any referenced protocols. 2741 search(iface->getReferencedProtocols()); 2742 } 2743 2744 void searchFrom(ObjCImplementationDecl *impl) { 2745 // A method in a class implementation overrides declarations from 2746 // the class interface. 2747 if (ObjCInterfaceDecl *Interface = impl->getClassInterface()) 2748 search(Interface); 2749 } 2750 2751 2752 void search(const ObjCProtocolList &protocols) { 2753 for (ObjCProtocolList::iterator i = protocols.begin(), e = protocols.end(); 2754 i != e; ++i) 2755 search(*i); 2756 } 2757 2758 void search(ObjCContainerDecl *container) { 2759 // Check for a method in this container which matches this selector. 2760 ObjCMethodDecl *meth = container->getMethod(Method->getSelector(), 2761 Method->isInstanceMethod()); 2762 2763 // If we find one, record it and bail out. 2764 if (meth) { 2765 Overridden.insert(meth); 2766 return; 2767 } 2768 2769 // Otherwise, search for methods that a hypothetical method here 2770 // would have overridden. 2771 2772 // Note that we're now in a recursive case. 2773 Recursive = true; 2774 2775 searchFromContainer(container); 2776 } 2777 }; 2778 } 2779 2780 void Sema::CheckObjCMethodOverrides(ObjCMethodDecl *ObjCMethod, 2781 ObjCInterfaceDecl *CurrentClass, 2782 ResultTypeCompatibilityKind RTC) { 2783 // Search for overridden methods and merge information down from them. 2784 OverrideSearch overrides(*this, ObjCMethod); 2785 // Keep track if the method overrides any method in the class's base classes, 2786 // its protocols, or its categories' protocols; we will keep that info 2787 // in the ObjCMethodDecl. 2788 // For this info, a method in an implementation is not considered as 2789 // overriding the same method in the interface or its categories. 2790 bool hasOverriddenMethodsInBaseOrProtocol = false; 2791 for (OverrideSearch::iterator 2792 i = overrides.begin(), e = overrides.end(); i != e; ++i) { 2793 ObjCMethodDecl *overridden = *i; 2794 2795 if (isa<ObjCProtocolDecl>(overridden->getDeclContext()) || 2796 CurrentClass != overridden->getClassInterface() || 2797 overridden->isOverriding()) 2798 hasOverriddenMethodsInBaseOrProtocol = true; 2799 2800 // Propagate down the 'related result type' bit from overridden methods. 2801 if (RTC != Sema::RTC_Incompatible && overridden->hasRelatedResultType()) 2802 ObjCMethod->SetRelatedResultType(); 2803 2804 // Then merge the declarations. 2805 mergeObjCMethodDecls(ObjCMethod, overridden); 2806 2807 if (ObjCMethod->isImplicit() && overridden->isImplicit()) 2808 continue; // Conflicting properties are detected elsewhere. 2809 2810 // Check for overriding methods 2811 if (isa<ObjCInterfaceDecl>(ObjCMethod->getDeclContext()) || 2812 isa<ObjCImplementationDecl>(ObjCMethod->getDeclContext())) 2813 CheckConflictingOverridingMethod(ObjCMethod, overridden, 2814 isa<ObjCProtocolDecl>(overridden->getDeclContext())); 2815 2816 if (CurrentClass && overridden->getDeclContext() != CurrentClass && 2817 isa<ObjCInterfaceDecl>(overridden->getDeclContext()) && 2818 !overridden->isImplicit() /* not meant for properties */) { 2819 ObjCMethodDecl::param_iterator ParamI = ObjCMethod->param_begin(), 2820 E = ObjCMethod->param_end(); 2821 ObjCMethodDecl::param_iterator PrevI = overridden->param_begin(), 2822 PrevE = overridden->param_end(); 2823 for (; ParamI != E && PrevI != PrevE; ++ParamI, ++PrevI) { 2824 assert(PrevI != overridden->param_end() && "Param mismatch"); 2825 QualType T1 = Context.getCanonicalType((*ParamI)->getType()); 2826 QualType T2 = Context.getCanonicalType((*PrevI)->getType()); 2827 // If type of argument of method in this class does not match its 2828 // respective argument type in the super class method, issue warning; 2829 if (!Context.typesAreCompatible(T1, T2)) { 2830 Diag((*ParamI)->getLocation(), diag::ext_typecheck_base_super) 2831 << T1 << T2; 2832 Diag(overridden->getLocation(), diag::note_previous_declaration); 2833 break; 2834 } 2835 } 2836 } 2837 } 2838 2839 ObjCMethod->setOverriding(hasOverriddenMethodsInBaseOrProtocol); 2840 } 2841 2842 Decl *Sema::ActOnMethodDeclaration( 2843 Scope *S, 2844 SourceLocation MethodLoc, SourceLocation EndLoc, 2845 tok::TokenKind MethodType, 2846 ObjCDeclSpec &ReturnQT, ParsedType ReturnType, 2847 ArrayRef<SourceLocation> SelectorLocs, 2848 Selector Sel, 2849 // optional arguments. The number of types/arguments is obtained 2850 // from the Sel.getNumArgs(). 2851 ObjCArgInfo *ArgInfo, 2852 DeclaratorChunk::ParamInfo *CParamInfo, unsigned CNumArgs, // c-style args 2853 AttributeList *AttrList, tok::ObjCKeywordKind MethodDeclKind, 2854 bool isVariadic, bool MethodDefinition) { 2855 // Make sure we can establish a context for the method. 2856 if (!CurContext->isObjCContainer()) { 2857 Diag(MethodLoc, diag::error_missing_method_context); 2858 return 0; 2859 } 2860 ObjCContainerDecl *OCD = dyn_cast<ObjCContainerDecl>(CurContext); 2861 Decl *ClassDecl = cast<Decl>(OCD); 2862 QualType resultDeclType; 2863 2864 bool HasRelatedResultType = false; 2865 TypeSourceInfo *ResultTInfo = 0; 2866 if (ReturnType) { 2867 resultDeclType = GetTypeFromParser(ReturnType, &ResultTInfo); 2868 2869 // Methods cannot return interface types. All ObjC objects are 2870 // passed by reference. 2871 if (resultDeclType->isObjCObjectType()) { 2872 Diag(MethodLoc, diag::err_object_cannot_be_passed_returned_by_value) 2873 << 0 << resultDeclType; 2874 return 0; 2875 } 2876 2877 HasRelatedResultType = (resultDeclType == Context.getObjCInstanceType()); 2878 } else { // get the type for "id". 2879 resultDeclType = Context.getObjCIdType(); 2880 Diag(MethodLoc, diag::warn_missing_method_return_type) 2881 << FixItHint::CreateInsertion(SelectorLocs.front(), "(id)"); 2882 } 2883 2884 ObjCMethodDecl* ObjCMethod = 2885 ObjCMethodDecl::Create(Context, MethodLoc, EndLoc, Sel, 2886 resultDeclType, 2887 ResultTInfo, 2888 CurContext, 2889 MethodType == tok::minus, isVariadic, 2890 /*isPropertyAccessor=*/false, 2891 /*isImplicitlyDeclared=*/false, /*isDefined=*/false, 2892 MethodDeclKind == tok::objc_optional 2893 ? ObjCMethodDecl::Optional 2894 : ObjCMethodDecl::Required, 2895 HasRelatedResultType); 2896 2897 SmallVector<ParmVarDecl*, 16> Params; 2898 2899 for (unsigned i = 0, e = Sel.getNumArgs(); i != e; ++i) { 2900 QualType ArgType; 2901 TypeSourceInfo *DI; 2902 2903 if (ArgInfo[i].Type == 0) { 2904 ArgType = Context.getObjCIdType(); 2905 DI = 0; 2906 } else { 2907 ArgType = GetTypeFromParser(ArgInfo[i].Type, &DI); 2908 } 2909 2910 LookupResult R(*this, ArgInfo[i].Name, ArgInfo[i].NameLoc, 2911 LookupOrdinaryName, ForRedeclaration); 2912 LookupName(R, S); 2913 if (R.isSingleResult()) { 2914 NamedDecl *PrevDecl = R.getFoundDecl(); 2915 if (S->isDeclScope(PrevDecl)) { 2916 Diag(ArgInfo[i].NameLoc, 2917 (MethodDefinition ? diag::warn_method_param_redefinition 2918 : diag::warn_method_param_declaration)) 2919 << ArgInfo[i].Name; 2920 Diag(PrevDecl->getLocation(), 2921 diag::note_previous_declaration); 2922 } 2923 } 2924 2925 SourceLocation StartLoc = DI 2926 ? DI->getTypeLoc().getBeginLoc() 2927 : ArgInfo[i].NameLoc; 2928 2929 ParmVarDecl* Param = CheckParameter(ObjCMethod, StartLoc, 2930 ArgInfo[i].NameLoc, ArgInfo[i].Name, 2931 ArgType, DI, SC_None, SC_None); 2932 2933 Param->setObjCMethodScopeInfo(i); 2934 2935 Param->setObjCDeclQualifier( 2936 CvtQTToAstBitMask(ArgInfo[i].DeclSpec.getObjCDeclQualifier())); 2937 2938 // Apply the attributes to the parameter. 2939 ProcessDeclAttributeList(TUScope, Param, ArgInfo[i].ArgAttrs); 2940 2941 if (Param->hasAttr<BlocksAttr>()) { 2942 Diag(Param->getLocation(), diag::err_block_on_nonlocal); 2943 Param->setInvalidDecl(); 2944 } 2945 S->AddDecl(Param); 2946 IdResolver.AddDecl(Param); 2947 2948 Params.push_back(Param); 2949 } 2950 2951 for (unsigned i = 0, e = CNumArgs; i != e; ++i) { 2952 ParmVarDecl *Param = cast<ParmVarDecl>(CParamInfo[i].Param); 2953 QualType ArgType = Param->getType(); 2954 if (ArgType.isNull()) 2955 ArgType = Context.getObjCIdType(); 2956 else 2957 // Perform the default array/function conversions (C99 6.7.5.3p[7,8]). 2958 ArgType = Context.getAdjustedParameterType(ArgType); 2959 if (ArgType->isObjCObjectType()) { 2960 Diag(Param->getLocation(), 2961 diag::err_object_cannot_be_passed_returned_by_value) 2962 << 1 << ArgType; 2963 Param->setInvalidDecl(); 2964 } 2965 Param->setDeclContext(ObjCMethod); 2966 2967 Params.push_back(Param); 2968 } 2969 2970 ObjCMethod->setMethodParams(Context, Params, SelectorLocs); 2971 ObjCMethod->setObjCDeclQualifier( 2972 CvtQTToAstBitMask(ReturnQT.getObjCDeclQualifier())); 2973 2974 if (AttrList) 2975 ProcessDeclAttributeList(TUScope, ObjCMethod, AttrList); 2976 2977 // Add the method now. 2978 const ObjCMethodDecl *PrevMethod = 0; 2979 if (ObjCImplDecl *ImpDecl = dyn_cast<ObjCImplDecl>(ClassDecl)) { 2980 if (MethodType == tok::minus) { 2981 PrevMethod = ImpDecl->getInstanceMethod(Sel); 2982 ImpDecl->addInstanceMethod(ObjCMethod); 2983 } else { 2984 PrevMethod = ImpDecl->getClassMethod(Sel); 2985 ImpDecl->addClassMethod(ObjCMethod); 2986 } 2987 2988 ObjCMethodDecl *IMD = 0; 2989 if (ObjCInterfaceDecl *IDecl = ImpDecl->getClassInterface()) 2990 IMD = IDecl->lookupMethod(ObjCMethod->getSelector(), 2991 ObjCMethod->isInstanceMethod()); 2992 if (ObjCMethod->hasAttrs() && 2993 containsInvalidMethodImplAttribute(IMD, ObjCMethod->getAttrs())) { 2994 SourceLocation MethodLoc = IMD->getLocation(); 2995 if (!getSourceManager().isInSystemHeader(MethodLoc)) { 2996 Diag(EndLoc, diag::warn_attribute_method_def); 2997 Diag(MethodLoc, diag::note_method_declared_at) 2998 << ObjCMethod->getDeclName(); 2999 } 3000 } 3001 } else { 3002 cast<DeclContext>(ClassDecl)->addDecl(ObjCMethod); 3003 } 3004 3005 if (PrevMethod) { 3006 // You can never have two method definitions with the same name. 3007 Diag(ObjCMethod->getLocation(), diag::err_duplicate_method_decl) 3008 << ObjCMethod->getDeclName(); 3009 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 3010 } 3011 3012 // If this Objective-C method does not have a related result type, but we 3013 // are allowed to infer related result types, try to do so based on the 3014 // method family. 3015 ObjCInterfaceDecl *CurrentClass = dyn_cast<ObjCInterfaceDecl>(ClassDecl); 3016 if (!CurrentClass) { 3017 if (ObjCCategoryDecl *Cat = dyn_cast<ObjCCategoryDecl>(ClassDecl)) 3018 CurrentClass = Cat->getClassInterface(); 3019 else if (ObjCImplDecl *Impl = dyn_cast<ObjCImplDecl>(ClassDecl)) 3020 CurrentClass = Impl->getClassInterface(); 3021 else if (ObjCCategoryImplDecl *CatImpl 3022 = dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) 3023 CurrentClass = CatImpl->getClassInterface(); 3024 } 3025 3026 ResultTypeCompatibilityKind RTC 3027 = CheckRelatedResultTypeCompatibility(*this, ObjCMethod, CurrentClass); 3028 3029 CheckObjCMethodOverrides(ObjCMethod, CurrentClass, RTC); 3030 3031 bool ARCError = false; 3032 if (getLangOpts().ObjCAutoRefCount) 3033 ARCError = CheckARCMethodDecl(*this, ObjCMethod); 3034 3035 // Infer the related result type when possible. 3036 if (!ARCError && RTC == Sema::RTC_Compatible && 3037 !ObjCMethod->hasRelatedResultType() && 3038 LangOpts.ObjCInferRelatedResultType) { 3039 bool InferRelatedResultType = false; 3040 switch (ObjCMethod->getMethodFamily()) { 3041 case OMF_None: 3042 case OMF_copy: 3043 case OMF_dealloc: 3044 case OMF_finalize: 3045 case OMF_mutableCopy: 3046 case OMF_release: 3047 case OMF_retainCount: 3048 case OMF_performSelector: 3049 break; 3050 3051 case OMF_alloc: 3052 case OMF_new: 3053 InferRelatedResultType = ObjCMethod->isClassMethod(); 3054 break; 3055 3056 case OMF_init: 3057 case OMF_autorelease: 3058 case OMF_retain: 3059 case OMF_self: 3060 InferRelatedResultType = ObjCMethod->isInstanceMethod(); 3061 break; 3062 } 3063 3064 if (InferRelatedResultType) 3065 ObjCMethod->SetRelatedResultType(); 3066 } 3067 3068 ActOnDocumentableDecl(ObjCMethod); 3069 3070 return ObjCMethod; 3071 } 3072 3073 bool Sema::CheckObjCDeclScope(Decl *D) { 3074 // Following is also an error. But it is caused by a missing @end 3075 // and diagnostic is issued elsewhere. 3076 if (isa<ObjCContainerDecl>(CurContext->getRedeclContext())) 3077 return false; 3078 3079 // If we switched context to translation unit while we are still lexically in 3080 // an objc container, it means the parser missed emitting an error. 3081 if (isa<TranslationUnitDecl>(getCurLexicalContext()->getRedeclContext())) 3082 return false; 3083 3084 Diag(D->getLocation(), diag::err_objc_decls_may_only_appear_in_global_scope); 3085 D->setInvalidDecl(); 3086 3087 return true; 3088 } 3089 3090 /// Called whenever \@defs(ClassName) is encountered in the source. Inserts the 3091 /// instance variables of ClassName into Decls. 3092 void Sema::ActOnDefs(Scope *S, Decl *TagD, SourceLocation DeclStart, 3093 IdentifierInfo *ClassName, 3094 SmallVectorImpl<Decl*> &Decls) { 3095 // Check that ClassName is a valid class 3096 ObjCInterfaceDecl *Class = getObjCInterfaceDecl(ClassName, DeclStart); 3097 if (!Class) { 3098 Diag(DeclStart, diag::err_undef_interface) << ClassName; 3099 return; 3100 } 3101 if (LangOpts.ObjCRuntime.isNonFragile()) { 3102 Diag(DeclStart, diag::err_atdef_nonfragile_interface); 3103 return; 3104 } 3105 3106 // Collect the instance variables 3107 SmallVector<const ObjCIvarDecl*, 32> Ivars; 3108 Context.DeepCollectObjCIvars(Class, true, Ivars); 3109 // For each ivar, create a fresh ObjCAtDefsFieldDecl. 3110 for (unsigned i = 0; i < Ivars.size(); i++) { 3111 const FieldDecl* ID = cast<FieldDecl>(Ivars[i]); 3112 RecordDecl *Record = dyn_cast<RecordDecl>(TagD); 3113 Decl *FD = ObjCAtDefsFieldDecl::Create(Context, Record, 3114 /*FIXME: StartL=*/ID->getLocation(), 3115 ID->getLocation(), 3116 ID->getIdentifier(), ID->getType(), 3117 ID->getBitWidth()); 3118 Decls.push_back(FD); 3119 } 3120 3121 // Introduce all of these fields into the appropriate scope. 3122 for (SmallVectorImpl<Decl*>::iterator D = Decls.begin(); 3123 D != Decls.end(); ++D) { 3124 FieldDecl *FD = cast<FieldDecl>(*D); 3125 if (getLangOpts().CPlusPlus) 3126 PushOnScopeChains(cast<FieldDecl>(FD), S); 3127 else if (RecordDecl *Record = dyn_cast<RecordDecl>(TagD)) 3128 Record->addDecl(FD); 3129 } 3130 } 3131 3132 /// \brief Build a type-check a new Objective-C exception variable declaration. 3133 VarDecl *Sema::BuildObjCExceptionDecl(TypeSourceInfo *TInfo, QualType T, 3134 SourceLocation StartLoc, 3135 SourceLocation IdLoc, 3136 IdentifierInfo *Id, 3137 bool Invalid) { 3138 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 3139 // duration shall not be qualified by an address-space qualifier." 3140 // Since all parameters have automatic store duration, they can not have 3141 // an address space. 3142 if (T.getAddressSpace() != 0) { 3143 Diag(IdLoc, diag::err_arg_with_address_space); 3144 Invalid = true; 3145 } 3146 3147 // An @catch parameter must be an unqualified object pointer type; 3148 // FIXME: Recover from "NSObject foo" by inserting the * in "NSObject *foo"? 3149 if (Invalid) { 3150 // Don't do any further checking. 3151 } else if (T->isDependentType()) { 3152 // Okay: we don't know what this type will instantiate to. 3153 } else if (!T->isObjCObjectPointerType()) { 3154 Invalid = true; 3155 Diag(IdLoc ,diag::err_catch_param_not_objc_type); 3156 } else if (T->isObjCQualifiedIdType()) { 3157 Invalid = true; 3158 Diag(IdLoc, diag::err_illegal_qualifiers_on_catch_parm); 3159 } 3160 3161 VarDecl *New = VarDecl::Create(Context, CurContext, StartLoc, IdLoc, Id, 3162 T, TInfo, SC_None, SC_None); 3163 New->setExceptionVariable(true); 3164 3165 // In ARC, infer 'retaining' for variables of retainable type. 3166 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(New)) 3167 Invalid = true; 3168 3169 if (Invalid) 3170 New->setInvalidDecl(); 3171 return New; 3172 } 3173 3174 Decl *Sema::ActOnObjCExceptionDecl(Scope *S, Declarator &D) { 3175 const DeclSpec &DS = D.getDeclSpec(); 3176 3177 // We allow the "register" storage class on exception variables because 3178 // GCC did, but we drop it completely. Any other storage class is an error. 3179 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 3180 Diag(DS.getStorageClassSpecLoc(), diag::warn_register_objc_catch_parm) 3181 << FixItHint::CreateRemoval(SourceRange(DS.getStorageClassSpecLoc())); 3182 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 3183 Diag(DS.getStorageClassSpecLoc(), diag::err_storage_spec_on_catch_parm) 3184 << DS.getStorageClassSpec(); 3185 } 3186 if (D.getDeclSpec().isThreadSpecified()) 3187 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3188 D.getMutableDeclSpec().ClearStorageClassSpecs(); 3189 3190 DiagnoseFunctionSpecifiers(D.getDeclSpec()); 3191 3192 // Check that there are no default arguments inside the type of this 3193 // exception object (C++ only). 3194 if (getLangOpts().CPlusPlus) 3195 CheckExtraCXXDefaultArguments(D); 3196 3197 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3198 QualType ExceptionType = TInfo->getType(); 3199 3200 VarDecl *New = BuildObjCExceptionDecl(TInfo, ExceptionType, 3201 D.getSourceRange().getBegin(), 3202 D.getIdentifierLoc(), 3203 D.getIdentifier(), 3204 D.isInvalidType()); 3205 3206 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 3207 if (D.getCXXScopeSpec().isSet()) { 3208 Diag(D.getIdentifierLoc(), diag::err_qualified_objc_catch_parm) 3209 << D.getCXXScopeSpec().getRange(); 3210 New->setInvalidDecl(); 3211 } 3212 3213 // Add the parameter declaration into this scope. 3214 S->AddDecl(New); 3215 if (D.getIdentifier()) 3216 IdResolver.AddDecl(New); 3217 3218 ProcessDeclAttributes(S, New, D); 3219 3220 if (New->hasAttr<BlocksAttr>()) 3221 Diag(New->getLocation(), diag::err_block_on_nonlocal); 3222 return New; 3223 } 3224 3225 /// CollectIvarsToConstructOrDestruct - Collect those ivars which require 3226 /// initialization. 3227 void Sema::CollectIvarsToConstructOrDestruct(ObjCInterfaceDecl *OI, 3228 SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 3229 for (ObjCIvarDecl *Iv = OI->all_declared_ivar_begin(); Iv; 3230 Iv= Iv->getNextIvar()) { 3231 QualType QT = Context.getBaseElementType(Iv->getType()); 3232 if (QT->isRecordType()) 3233 Ivars.push_back(Iv); 3234 } 3235 } 3236 3237 void Sema::DiagnoseUseOfUnimplementedSelectors() { 3238 // Load referenced selectors from the external source. 3239 if (ExternalSource) { 3240 SmallVector<std::pair<Selector, SourceLocation>, 4> Sels; 3241 ExternalSource->ReadReferencedSelectors(Sels); 3242 for (unsigned I = 0, N = Sels.size(); I != N; ++I) 3243 ReferencedSelectors[Sels[I].first] = Sels[I].second; 3244 } 3245 3246 // Warning will be issued only when selector table is 3247 // generated (which means there is at lease one implementation 3248 // in the TU). This is to match gcc's behavior. 3249 if (ReferencedSelectors.empty() || 3250 !Context.AnyObjCImplementation()) 3251 return; 3252 for (llvm::DenseMap<Selector, SourceLocation>::iterator S = 3253 ReferencedSelectors.begin(), 3254 E = ReferencedSelectors.end(); S != E; ++S) { 3255 Selector Sel = (*S).first; 3256 if (!LookupImplementedMethodInGlobalPool(Sel)) 3257 Diag((*S).second, diag::warn_unimplemented_selector) << Sel; 3258 } 3259 return; 3260 } 3261