SemaDeclObjC.cpp revision 249423
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 30using 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 41bool 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 111void 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_family) 155 << /*overridden method*/ 0 156 << Family; 157 else 158 Diag(Overridden->getLocation(), 159 diag::note_related_result_type_overridden); 160 } 161 if (getLangOpts().ObjCAutoRefCount) { 162 if ((NewMethod->hasAttr<NSReturnsRetainedAttr>() != 163 Overridden->hasAttr<NSReturnsRetainedAttr>())) { 164 Diag(NewMethod->getLocation(), 165 diag::err_nsreturns_retained_attribute_mismatch) << 1; 166 Diag(Overridden->getLocation(), diag::note_previous_decl) 167 << "method"; 168 } 169 if ((NewMethod->hasAttr<NSReturnsNotRetainedAttr>() != 170 Overridden->hasAttr<NSReturnsNotRetainedAttr>())) { 171 Diag(NewMethod->getLocation(), 172 diag::err_nsreturns_retained_attribute_mismatch) << 0; 173 Diag(Overridden->getLocation(), diag::note_previous_decl) 174 << "method"; 175 } 176 ObjCMethodDecl::param_const_iterator oi = Overridden->param_begin(), 177 oe = Overridden->param_end(); 178 for (ObjCMethodDecl::param_iterator 179 ni = NewMethod->param_begin(), ne = NewMethod->param_end(); 180 ni != ne && oi != oe; ++ni, ++oi) { 181 const ParmVarDecl *oldDecl = (*oi); 182 ParmVarDecl *newDecl = (*ni); 183 if (newDecl->hasAttr<NSConsumedAttr>() != 184 oldDecl->hasAttr<NSConsumedAttr>()) { 185 Diag(newDecl->getLocation(), 186 diag::err_nsconsumed_attribute_mismatch); 187 Diag(oldDecl->getLocation(), diag::note_previous_decl) 188 << "parameter"; 189 } 190 } 191 } 192} 193 194/// \brief Check a method declaration for compatibility with the Objective-C 195/// ARC conventions. 196bool Sema::CheckARCMethodDecl(ObjCMethodDecl *method) { 197 ObjCMethodFamily family = method->getMethodFamily(); 198 switch (family) { 199 case OMF_None: 200 case OMF_finalize: 201 case OMF_retain: 202 case OMF_release: 203 case OMF_autorelease: 204 case OMF_retainCount: 205 case OMF_self: 206 case OMF_performSelector: 207 return false; 208 209 case OMF_dealloc: 210 if (!Context.hasSameType(method->getResultType(), Context.VoidTy)) { 211 SourceRange ResultTypeRange; 212 if (const TypeSourceInfo *ResultTypeInfo 213 = method->getResultTypeSourceInfo()) 214 ResultTypeRange = ResultTypeInfo->getTypeLoc().getSourceRange(); 215 if (ResultTypeRange.isInvalid()) 216 Diag(method->getLocation(), diag::error_dealloc_bad_result_type) 217 << method->getResultType() 218 << FixItHint::CreateInsertion(method->getSelectorLoc(0), "(void)"); 219 else 220 Diag(method->getLocation(), diag::error_dealloc_bad_result_type) 221 << method->getResultType() 222 << FixItHint::CreateReplacement(ResultTypeRange, "void"); 223 return true; 224 } 225 return false; 226 227 case OMF_init: 228 // If the method doesn't obey the init rules, don't bother annotating it. 229 if (checkInitMethod(method, QualType())) 230 return true; 231 232 method->addAttr(new (Context) NSConsumesSelfAttr(SourceLocation(), 233 Context)); 234 235 // Don't add a second copy of this attribute, but otherwise don't 236 // let it be suppressed. 237 if (method->hasAttr<NSReturnsRetainedAttr>()) 238 return false; 239 break; 240 241 case OMF_alloc: 242 case OMF_copy: 243 case OMF_mutableCopy: 244 case OMF_new: 245 if (method->hasAttr<NSReturnsRetainedAttr>() || 246 method->hasAttr<NSReturnsNotRetainedAttr>() || 247 method->hasAttr<NSReturnsAutoreleasedAttr>()) 248 return false; 249 break; 250 } 251 252 method->addAttr(new (Context) NSReturnsRetainedAttr(SourceLocation(), 253 Context)); 254 return false; 255} 256 257static void DiagnoseObjCImplementedDeprecations(Sema &S, 258 NamedDecl *ND, 259 SourceLocation ImplLoc, 260 int select) { 261 if (ND && ND->isDeprecated()) { 262 S.Diag(ImplLoc, diag::warn_deprecated_def) << select; 263 if (select == 0) 264 S.Diag(ND->getLocation(), diag::note_method_declared_at) 265 << ND->getDeclName(); 266 else 267 S.Diag(ND->getLocation(), diag::note_previous_decl) << "class"; 268 } 269} 270 271/// AddAnyMethodToGlobalPool - Add any method, instance or factory to global 272/// pool. 273void Sema::AddAnyMethodToGlobalPool(Decl *D) { 274 ObjCMethodDecl *MDecl = dyn_cast_or_null<ObjCMethodDecl>(D); 275 276 // If we don't have a valid method decl, simply return. 277 if (!MDecl) 278 return; 279 if (MDecl->isInstanceMethod()) 280 AddInstanceMethodToGlobalPool(MDecl, true); 281 else 282 AddFactoryMethodToGlobalPool(MDecl, true); 283} 284 285/// HasExplicitOwnershipAttr - returns true when pointer to ObjC pointer 286/// has explicit ownership attribute; false otherwise. 287static bool 288HasExplicitOwnershipAttr(Sema &S, ParmVarDecl *Param) { 289 QualType T = Param->getType(); 290 291 if (const PointerType *PT = T->getAs<PointerType>()) { 292 T = PT->getPointeeType(); 293 } else if (const ReferenceType *RT = T->getAs<ReferenceType>()) { 294 T = RT->getPointeeType(); 295 } else { 296 return true; 297 } 298 299 // If we have a lifetime qualifier, but it's local, we must have 300 // inferred it. So, it is implicit. 301 return !T.getLocalQualifiers().hasObjCLifetime(); 302} 303 304/// ActOnStartOfObjCMethodDef - This routine sets up parameters; invisible 305/// and user declared, in the method definition's AST. 306void Sema::ActOnStartOfObjCMethodDef(Scope *FnBodyScope, Decl *D) { 307 assert((getCurMethodDecl() == 0) && "Methodparsing confused"); 308 ObjCMethodDecl *MDecl = dyn_cast_or_null<ObjCMethodDecl>(D); 309 310 // If we don't have a valid method decl, simply return. 311 if (!MDecl) 312 return; 313 314 // Allow all of Sema to see that we are entering a method definition. 315 PushDeclContext(FnBodyScope, MDecl); 316 PushFunctionScope(); 317 318 // Create Decl objects for each parameter, entrring them in the scope for 319 // binding to their use. 320 321 // Insert the invisible arguments, self and _cmd! 322 MDecl->createImplicitParams(Context, MDecl->getClassInterface()); 323 324 PushOnScopeChains(MDecl->getSelfDecl(), FnBodyScope); 325 PushOnScopeChains(MDecl->getCmdDecl(), FnBodyScope); 326 327 // Introduce all of the other parameters into this scope. 328 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(), 329 E = MDecl->param_end(); PI != E; ++PI) { 330 ParmVarDecl *Param = (*PI); 331 if (!Param->isInvalidDecl() && 332 RequireCompleteType(Param->getLocation(), Param->getType(), 333 diag::err_typecheck_decl_incomplete_type)) 334 Param->setInvalidDecl(); 335 if (!Param->isInvalidDecl() && 336 getLangOpts().ObjCAutoRefCount && 337 !HasExplicitOwnershipAttr(*this, Param)) 338 Diag(Param->getLocation(), diag::warn_arc_strong_pointer_objc_pointer) << 339 Param->getType(); 340 341 if ((*PI)->getIdentifier()) 342 PushOnScopeChains(*PI, FnBodyScope); 343 } 344 345 // In ARC, disallow definition of retain/release/autorelease/retainCount 346 if (getLangOpts().ObjCAutoRefCount) { 347 switch (MDecl->getMethodFamily()) { 348 case OMF_retain: 349 case OMF_retainCount: 350 case OMF_release: 351 case OMF_autorelease: 352 Diag(MDecl->getLocation(), diag::err_arc_illegal_method_def) 353 << MDecl->getSelector(); 354 break; 355 356 case OMF_None: 357 case OMF_dealloc: 358 case OMF_finalize: 359 case OMF_alloc: 360 case OMF_init: 361 case OMF_mutableCopy: 362 case OMF_copy: 363 case OMF_new: 364 case OMF_self: 365 case OMF_performSelector: 366 break; 367 } 368 } 369 370 // Warn on deprecated methods under -Wdeprecated-implementations, 371 // and prepare for warning on missing super calls. 372 if (ObjCInterfaceDecl *IC = MDecl->getClassInterface()) { 373 ObjCMethodDecl *IMD = 374 IC->lookupMethod(MDecl->getSelector(), MDecl->isInstanceMethod()); 375 376 if (IMD) { 377 ObjCImplDecl *ImplDeclOfMethodDef = 378 dyn_cast<ObjCImplDecl>(MDecl->getDeclContext()); 379 ObjCContainerDecl *ContDeclOfMethodDecl = 380 dyn_cast<ObjCContainerDecl>(IMD->getDeclContext()); 381 ObjCImplDecl *ImplDeclOfMethodDecl = 0; 382 if (ObjCInterfaceDecl *OID = dyn_cast<ObjCInterfaceDecl>(ContDeclOfMethodDecl)) 383 ImplDeclOfMethodDecl = OID->getImplementation(); 384 else if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(ContDeclOfMethodDecl)) 385 ImplDeclOfMethodDecl = CD->getImplementation(); 386 // No need to issue deprecated warning if deprecated mehod in class/category 387 // is being implemented in its own implementation (no overriding is involved). 388 if (!ImplDeclOfMethodDecl || ImplDeclOfMethodDecl != ImplDeclOfMethodDef) 389 DiagnoseObjCImplementedDeprecations(*this, 390 dyn_cast<NamedDecl>(IMD), 391 MDecl->getLocation(), 0); 392 } 393 394 // If this is "dealloc" or "finalize", set some bit here. 395 // Then in ActOnSuperMessage() (SemaExprObjC), set it back to false. 396 // Finally, in ActOnFinishFunctionBody() (SemaDecl), warn if flag is set. 397 // Only do this if the current class actually has a superclass. 398 if (const ObjCInterfaceDecl *SuperClass = IC->getSuperClass()) { 399 ObjCMethodFamily Family = MDecl->getMethodFamily(); 400 if (Family == OMF_dealloc) { 401 if (!(getLangOpts().ObjCAutoRefCount || 402 getLangOpts().getGC() == LangOptions::GCOnly)) 403 getCurFunction()->ObjCShouldCallSuper = true; 404 405 } else if (Family == OMF_finalize) { 406 if (Context.getLangOpts().getGC() != LangOptions::NonGC) 407 getCurFunction()->ObjCShouldCallSuper = true; 408 409 } else { 410 const ObjCMethodDecl *SuperMethod = 411 SuperClass->lookupMethod(MDecl->getSelector(), 412 MDecl->isInstanceMethod()); 413 getCurFunction()->ObjCShouldCallSuper = 414 (SuperMethod && SuperMethod->hasAttr<ObjCRequiresSuperAttr>()); 415 } 416 } 417 } 418} 419 420namespace { 421 422// Callback to only accept typo corrections that are Objective-C classes. 423// If an ObjCInterfaceDecl* is given to the constructor, then the validation 424// function will reject corrections to that class. 425class ObjCInterfaceValidatorCCC : public CorrectionCandidateCallback { 426 public: 427 ObjCInterfaceValidatorCCC() : CurrentIDecl(0) {} 428 explicit ObjCInterfaceValidatorCCC(ObjCInterfaceDecl *IDecl) 429 : CurrentIDecl(IDecl) {} 430 431 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 432 ObjCInterfaceDecl *ID = candidate.getCorrectionDeclAs<ObjCInterfaceDecl>(); 433 return ID && !declaresSameEntity(ID, CurrentIDecl); 434 } 435 436 private: 437 ObjCInterfaceDecl *CurrentIDecl; 438}; 439 440} 441 442Decl *Sema:: 443ActOnStartClassInterface(SourceLocation AtInterfaceLoc, 444 IdentifierInfo *ClassName, SourceLocation ClassLoc, 445 IdentifierInfo *SuperName, SourceLocation SuperLoc, 446 Decl * const *ProtoRefs, unsigned NumProtoRefs, 447 const SourceLocation *ProtoLocs, 448 SourceLocation EndProtoLoc, AttributeList *AttrList) { 449 assert(ClassName && "Missing class identifier"); 450 451 // Check for another declaration kind with the same name. 452 NamedDecl *PrevDecl = LookupSingleName(TUScope, ClassName, ClassLoc, 453 LookupOrdinaryName, ForRedeclaration); 454 455 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 456 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName; 457 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 458 } 459 460 // Create a declaration to describe this @interface. 461 ObjCInterfaceDecl* PrevIDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 462 ObjCInterfaceDecl *IDecl 463 = ObjCInterfaceDecl::Create(Context, CurContext, AtInterfaceLoc, ClassName, 464 PrevIDecl, ClassLoc); 465 466 if (PrevIDecl) { 467 // Class already seen. Was it a definition? 468 if (ObjCInterfaceDecl *Def = PrevIDecl->getDefinition()) { 469 Diag(AtInterfaceLoc, diag::err_duplicate_class_def) 470 << PrevIDecl->getDeclName(); 471 Diag(Def->getLocation(), diag::note_previous_definition); 472 IDecl->setInvalidDecl(); 473 } 474 } 475 476 if (AttrList) 477 ProcessDeclAttributeList(TUScope, IDecl, AttrList); 478 PushOnScopeChains(IDecl, TUScope); 479 480 // Start the definition of this class. If we're in a redefinition case, there 481 // may already be a definition, so we'll end up adding to it. 482 if (!IDecl->hasDefinition()) 483 IDecl->startDefinition(); 484 485 if (SuperName) { 486 // Check if a different kind of symbol declared in this scope. 487 PrevDecl = LookupSingleName(TUScope, SuperName, SuperLoc, 488 LookupOrdinaryName); 489 490 if (!PrevDecl) { 491 // Try to correct for a typo in the superclass name without correcting 492 // to the class we're defining. 493 ObjCInterfaceValidatorCCC Validator(IDecl); 494 if (TypoCorrection Corrected = CorrectTypo( 495 DeclarationNameInfo(SuperName, SuperLoc), LookupOrdinaryName, TUScope, 496 NULL, Validator)) { 497 PrevDecl = Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>(); 498 Diag(SuperLoc, diag::err_undef_superclass_suggest) 499 << SuperName << ClassName << PrevDecl->getDeclName(); 500 Diag(PrevDecl->getLocation(), diag::note_previous_decl) 501 << PrevDecl->getDeclName(); 502 } 503 } 504 505 if (declaresSameEntity(PrevDecl, IDecl)) { 506 Diag(SuperLoc, diag::err_recursive_superclass) 507 << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc); 508 IDecl->setEndOfDefinitionLoc(ClassLoc); 509 } else { 510 ObjCInterfaceDecl *SuperClassDecl = 511 dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 512 513 // Diagnose classes that inherit from deprecated classes. 514 if (SuperClassDecl) 515 (void)DiagnoseUseOfDecl(SuperClassDecl, SuperLoc); 516 517 if (PrevDecl && SuperClassDecl == 0) { 518 // The previous declaration was not a class decl. Check if we have a 519 // typedef. If we do, get the underlying class type. 520 if (const TypedefNameDecl *TDecl = 521 dyn_cast_or_null<TypedefNameDecl>(PrevDecl)) { 522 QualType T = TDecl->getUnderlyingType(); 523 if (T->isObjCObjectType()) { 524 if (NamedDecl *IDecl = T->getAs<ObjCObjectType>()->getInterface()) { 525 SuperClassDecl = dyn_cast<ObjCInterfaceDecl>(IDecl); 526 // This handles the following case: 527 // @interface NewI @end 528 // typedef NewI DeprI __attribute__((deprecated("blah"))) 529 // @interface SI : DeprI /* warn here */ @end 530 (void)DiagnoseUseOfDecl(const_cast<TypedefNameDecl*>(TDecl), SuperLoc); 531 } 532 } 533 } 534 535 // This handles the following case: 536 // 537 // typedef int SuperClass; 538 // @interface MyClass : SuperClass {} @end 539 // 540 if (!SuperClassDecl) { 541 Diag(SuperLoc, diag::err_redefinition_different_kind) << SuperName; 542 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 543 } 544 } 545 546 if (!dyn_cast_or_null<TypedefNameDecl>(PrevDecl)) { 547 if (!SuperClassDecl) 548 Diag(SuperLoc, diag::err_undef_superclass) 549 << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc); 550 else if (RequireCompleteType(SuperLoc, 551 Context.getObjCInterfaceType(SuperClassDecl), 552 diag::err_forward_superclass, 553 SuperClassDecl->getDeclName(), 554 ClassName, 555 SourceRange(AtInterfaceLoc, ClassLoc))) { 556 SuperClassDecl = 0; 557 } 558 } 559 IDecl->setSuperClass(SuperClassDecl); 560 IDecl->setSuperClassLoc(SuperLoc); 561 IDecl->setEndOfDefinitionLoc(SuperLoc); 562 } 563 } else { // we have a root class. 564 IDecl->setEndOfDefinitionLoc(ClassLoc); 565 } 566 567 // Check then save referenced protocols. 568 if (NumProtoRefs) { 569 IDecl->setProtocolList((ObjCProtocolDecl*const*)ProtoRefs, NumProtoRefs, 570 ProtoLocs, Context); 571 IDecl->setEndOfDefinitionLoc(EndProtoLoc); 572 } 573 574 CheckObjCDeclScope(IDecl); 575 return ActOnObjCContainerStartDefinition(IDecl); 576} 577 578/// ActOnCompatibilityAlias - this action is called after complete parsing of 579/// a \@compatibility_alias declaration. It sets up the alias relationships. 580Decl *Sema::ActOnCompatibilityAlias(SourceLocation AtLoc, 581 IdentifierInfo *AliasName, 582 SourceLocation AliasLocation, 583 IdentifierInfo *ClassName, 584 SourceLocation ClassLocation) { 585 // Look for previous declaration of alias name 586 NamedDecl *ADecl = LookupSingleName(TUScope, AliasName, AliasLocation, 587 LookupOrdinaryName, ForRedeclaration); 588 if (ADecl) { 589 if (isa<ObjCCompatibleAliasDecl>(ADecl)) 590 Diag(AliasLocation, diag::warn_previous_alias_decl); 591 else 592 Diag(AliasLocation, diag::err_conflicting_aliasing_type) << AliasName; 593 Diag(ADecl->getLocation(), diag::note_previous_declaration); 594 return 0; 595 } 596 // Check for class declaration 597 NamedDecl *CDeclU = LookupSingleName(TUScope, ClassName, ClassLocation, 598 LookupOrdinaryName, ForRedeclaration); 599 if (const TypedefNameDecl *TDecl = 600 dyn_cast_or_null<TypedefNameDecl>(CDeclU)) { 601 QualType T = TDecl->getUnderlyingType(); 602 if (T->isObjCObjectType()) { 603 if (NamedDecl *IDecl = T->getAs<ObjCObjectType>()->getInterface()) { 604 ClassName = IDecl->getIdentifier(); 605 CDeclU = LookupSingleName(TUScope, ClassName, ClassLocation, 606 LookupOrdinaryName, ForRedeclaration); 607 } 608 } 609 } 610 ObjCInterfaceDecl *CDecl = dyn_cast_or_null<ObjCInterfaceDecl>(CDeclU); 611 if (CDecl == 0) { 612 Diag(ClassLocation, diag::warn_undef_interface) << ClassName; 613 if (CDeclU) 614 Diag(CDeclU->getLocation(), diag::note_previous_declaration); 615 return 0; 616 } 617 618 // Everything checked out, instantiate a new alias declaration AST. 619 ObjCCompatibleAliasDecl *AliasDecl = 620 ObjCCompatibleAliasDecl::Create(Context, CurContext, AtLoc, AliasName, CDecl); 621 622 if (!CheckObjCDeclScope(AliasDecl)) 623 PushOnScopeChains(AliasDecl, TUScope); 624 625 return AliasDecl; 626} 627 628bool Sema::CheckForwardProtocolDeclarationForCircularDependency( 629 IdentifierInfo *PName, 630 SourceLocation &Ploc, SourceLocation PrevLoc, 631 const ObjCList<ObjCProtocolDecl> &PList) { 632 633 bool res = false; 634 for (ObjCList<ObjCProtocolDecl>::iterator I = PList.begin(), 635 E = PList.end(); I != E; ++I) { 636 if (ObjCProtocolDecl *PDecl = LookupProtocol((*I)->getIdentifier(), 637 Ploc)) { 638 if (PDecl->getIdentifier() == PName) { 639 Diag(Ploc, diag::err_protocol_has_circular_dependency); 640 Diag(PrevLoc, diag::note_previous_definition); 641 res = true; 642 } 643 644 if (!PDecl->hasDefinition()) 645 continue; 646 647 if (CheckForwardProtocolDeclarationForCircularDependency(PName, Ploc, 648 PDecl->getLocation(), PDecl->getReferencedProtocols())) 649 res = true; 650 } 651 } 652 return res; 653} 654 655Decl * 656Sema::ActOnStartProtocolInterface(SourceLocation AtProtoInterfaceLoc, 657 IdentifierInfo *ProtocolName, 658 SourceLocation ProtocolLoc, 659 Decl * const *ProtoRefs, 660 unsigned NumProtoRefs, 661 const SourceLocation *ProtoLocs, 662 SourceLocation EndProtoLoc, 663 AttributeList *AttrList) { 664 bool err = false; 665 // FIXME: Deal with AttrList. 666 assert(ProtocolName && "Missing protocol identifier"); 667 ObjCProtocolDecl *PrevDecl = LookupProtocol(ProtocolName, ProtocolLoc, 668 ForRedeclaration); 669 ObjCProtocolDecl *PDecl = 0; 670 if (ObjCProtocolDecl *Def = PrevDecl? PrevDecl->getDefinition() : 0) { 671 // If we already have a definition, complain. 672 Diag(ProtocolLoc, diag::warn_duplicate_protocol_def) << ProtocolName; 673 Diag(Def->getLocation(), diag::note_previous_definition); 674 675 // Create a new protocol that is completely distinct from previous 676 // declarations, and do not make this protocol available for name lookup. 677 // That way, we'll end up completely ignoring the duplicate. 678 // FIXME: Can we turn this into an error? 679 PDecl = ObjCProtocolDecl::Create(Context, CurContext, ProtocolName, 680 ProtocolLoc, AtProtoInterfaceLoc, 681 /*PrevDecl=*/0); 682 PDecl->startDefinition(); 683 } else { 684 if (PrevDecl) { 685 // Check for circular dependencies among protocol declarations. This can 686 // only happen if this protocol was forward-declared. 687 ObjCList<ObjCProtocolDecl> PList; 688 PList.set((ObjCProtocolDecl *const*)ProtoRefs, NumProtoRefs, Context); 689 err = CheckForwardProtocolDeclarationForCircularDependency( 690 ProtocolName, ProtocolLoc, PrevDecl->getLocation(), PList); 691 } 692 693 // Create the new declaration. 694 PDecl = ObjCProtocolDecl::Create(Context, CurContext, ProtocolName, 695 ProtocolLoc, AtProtoInterfaceLoc, 696 /*PrevDecl=*/PrevDecl); 697 698 PushOnScopeChains(PDecl, TUScope); 699 PDecl->startDefinition(); 700 } 701 702 if (AttrList) 703 ProcessDeclAttributeList(TUScope, PDecl, AttrList); 704 705 // Merge attributes from previous declarations. 706 if (PrevDecl) 707 mergeDeclAttributes(PDecl, PrevDecl); 708 709 if (!err && NumProtoRefs ) { 710 /// Check then save referenced protocols. 711 PDecl->setProtocolList((ObjCProtocolDecl*const*)ProtoRefs, NumProtoRefs, 712 ProtoLocs, Context); 713 } 714 715 CheckObjCDeclScope(PDecl); 716 return ActOnObjCContainerStartDefinition(PDecl); 717} 718 719/// FindProtocolDeclaration - This routine looks up protocols and 720/// issues an error if they are not declared. It returns list of 721/// protocol declarations in its 'Protocols' argument. 722void 723Sema::FindProtocolDeclaration(bool WarnOnDeclarations, 724 const IdentifierLocPair *ProtocolId, 725 unsigned NumProtocols, 726 SmallVectorImpl<Decl *> &Protocols) { 727 for (unsigned i = 0; i != NumProtocols; ++i) { 728 ObjCProtocolDecl *PDecl = LookupProtocol(ProtocolId[i].first, 729 ProtocolId[i].second); 730 if (!PDecl) { 731 DeclFilterCCC<ObjCProtocolDecl> Validator; 732 TypoCorrection Corrected = CorrectTypo( 733 DeclarationNameInfo(ProtocolId[i].first, ProtocolId[i].second), 734 LookupObjCProtocolName, TUScope, NULL, Validator); 735 if ((PDecl = Corrected.getCorrectionDeclAs<ObjCProtocolDecl>())) { 736 Diag(ProtocolId[i].second, diag::err_undeclared_protocol_suggest) 737 << ProtocolId[i].first << Corrected.getCorrection(); 738 Diag(PDecl->getLocation(), diag::note_previous_decl) 739 << PDecl->getDeclName(); 740 } 741 } 742 743 if (!PDecl) { 744 Diag(ProtocolId[i].second, diag::err_undeclared_protocol) 745 << ProtocolId[i].first; 746 continue; 747 } 748 749 (void)DiagnoseUseOfDecl(PDecl, ProtocolId[i].second); 750 751 // If this is a forward declaration and we are supposed to warn in this 752 // case, do it. 753 // FIXME: Recover nicely in the hidden case. 754 if (WarnOnDeclarations && 755 (!PDecl->hasDefinition() || PDecl->getDefinition()->isHidden())) 756 Diag(ProtocolId[i].second, diag::warn_undef_protocolref) 757 << ProtocolId[i].first; 758 Protocols.push_back(PDecl); 759 } 760} 761 762/// DiagnoseClassExtensionDupMethods - Check for duplicate declaration of 763/// a class method in its extension. 764/// 765void Sema::DiagnoseClassExtensionDupMethods(ObjCCategoryDecl *CAT, 766 ObjCInterfaceDecl *ID) { 767 if (!ID) 768 return; // Possibly due to previous error 769 770 llvm::DenseMap<Selector, const ObjCMethodDecl*> MethodMap; 771 for (ObjCInterfaceDecl::method_iterator i = ID->meth_begin(), 772 e = ID->meth_end(); i != e; ++i) { 773 ObjCMethodDecl *MD = *i; 774 MethodMap[MD->getSelector()] = MD; 775 } 776 777 if (MethodMap.empty()) 778 return; 779 for (ObjCCategoryDecl::method_iterator i = CAT->meth_begin(), 780 e = CAT->meth_end(); i != e; ++i) { 781 ObjCMethodDecl *Method = *i; 782 const ObjCMethodDecl *&PrevMethod = MethodMap[Method->getSelector()]; 783 if (PrevMethod && !MatchTwoMethodDeclarations(Method, PrevMethod)) { 784 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 785 << Method->getDeclName(); 786 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 787 } 788 } 789} 790 791/// ActOnForwardProtocolDeclaration - Handle \@protocol foo; 792Sema::DeclGroupPtrTy 793Sema::ActOnForwardProtocolDeclaration(SourceLocation AtProtocolLoc, 794 const IdentifierLocPair *IdentList, 795 unsigned NumElts, 796 AttributeList *attrList) { 797 SmallVector<Decl *, 8> DeclsInGroup; 798 for (unsigned i = 0; i != NumElts; ++i) { 799 IdentifierInfo *Ident = IdentList[i].first; 800 ObjCProtocolDecl *PrevDecl = LookupProtocol(Ident, IdentList[i].second, 801 ForRedeclaration); 802 ObjCProtocolDecl *PDecl 803 = ObjCProtocolDecl::Create(Context, CurContext, Ident, 804 IdentList[i].second, AtProtocolLoc, 805 PrevDecl); 806 807 PushOnScopeChains(PDecl, TUScope); 808 CheckObjCDeclScope(PDecl); 809 810 if (attrList) 811 ProcessDeclAttributeList(TUScope, PDecl, attrList); 812 813 if (PrevDecl) 814 mergeDeclAttributes(PDecl, PrevDecl); 815 816 DeclsInGroup.push_back(PDecl); 817 } 818 819 return BuildDeclaratorGroup(DeclsInGroup.data(), DeclsInGroup.size(), false); 820} 821 822Decl *Sema:: 823ActOnStartCategoryInterface(SourceLocation AtInterfaceLoc, 824 IdentifierInfo *ClassName, SourceLocation ClassLoc, 825 IdentifierInfo *CategoryName, 826 SourceLocation CategoryLoc, 827 Decl * const *ProtoRefs, 828 unsigned NumProtoRefs, 829 const SourceLocation *ProtoLocs, 830 SourceLocation EndProtoLoc) { 831 ObjCCategoryDecl *CDecl; 832 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true); 833 834 /// Check that class of this category is already completely declared. 835 836 if (!IDecl 837 || RequireCompleteType(ClassLoc, Context.getObjCInterfaceType(IDecl), 838 diag::err_category_forward_interface, 839 CategoryName == 0)) { 840 // Create an invalid ObjCCategoryDecl to serve as context for 841 // the enclosing method declarations. We mark the decl invalid 842 // to make it clear that this isn't a valid AST. 843 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc, 844 ClassLoc, CategoryLoc, CategoryName,IDecl); 845 CDecl->setInvalidDecl(); 846 CurContext->addDecl(CDecl); 847 848 if (!IDecl) 849 Diag(ClassLoc, diag::err_undef_interface) << ClassName; 850 return ActOnObjCContainerStartDefinition(CDecl); 851 } 852 853 if (!CategoryName && IDecl->getImplementation()) { 854 Diag(ClassLoc, diag::err_class_extension_after_impl) << ClassName; 855 Diag(IDecl->getImplementation()->getLocation(), 856 diag::note_implementation_declared); 857 } 858 859 if (CategoryName) { 860 /// Check for duplicate interface declaration for this category 861 if (ObjCCategoryDecl *Previous 862 = IDecl->FindCategoryDeclaration(CategoryName)) { 863 // Class extensions can be declared multiple times, categories cannot. 864 Diag(CategoryLoc, diag::warn_dup_category_def) 865 << ClassName << CategoryName; 866 Diag(Previous->getLocation(), diag::note_previous_definition); 867 } 868 } 869 870 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc, 871 ClassLoc, CategoryLoc, CategoryName, IDecl); 872 // FIXME: PushOnScopeChains? 873 CurContext->addDecl(CDecl); 874 875 if (NumProtoRefs) { 876 CDecl->setProtocolList((ObjCProtocolDecl*const*)ProtoRefs, NumProtoRefs, 877 ProtoLocs, Context); 878 // Protocols in the class extension belong to the class. 879 if (CDecl->IsClassExtension()) 880 IDecl->mergeClassExtensionProtocolList((ObjCProtocolDecl*const*)ProtoRefs, 881 NumProtoRefs, Context); 882 } 883 884 CheckObjCDeclScope(CDecl); 885 return ActOnObjCContainerStartDefinition(CDecl); 886} 887 888/// ActOnStartCategoryImplementation - Perform semantic checks on the 889/// category implementation declaration and build an ObjCCategoryImplDecl 890/// object. 891Decl *Sema::ActOnStartCategoryImplementation( 892 SourceLocation AtCatImplLoc, 893 IdentifierInfo *ClassName, SourceLocation ClassLoc, 894 IdentifierInfo *CatName, SourceLocation CatLoc) { 895 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true); 896 ObjCCategoryDecl *CatIDecl = 0; 897 if (IDecl && IDecl->hasDefinition()) { 898 CatIDecl = IDecl->FindCategoryDeclaration(CatName); 899 if (!CatIDecl) { 900 // Category @implementation with no corresponding @interface. 901 // Create and install one. 902 CatIDecl = ObjCCategoryDecl::Create(Context, CurContext, AtCatImplLoc, 903 ClassLoc, CatLoc, 904 CatName, IDecl); 905 CatIDecl->setImplicit(); 906 } 907 } 908 909 ObjCCategoryImplDecl *CDecl = 910 ObjCCategoryImplDecl::Create(Context, CurContext, CatName, IDecl, 911 ClassLoc, AtCatImplLoc, CatLoc); 912 /// Check that class of this category is already completely declared. 913 if (!IDecl) { 914 Diag(ClassLoc, diag::err_undef_interface) << ClassName; 915 CDecl->setInvalidDecl(); 916 } else if (RequireCompleteType(ClassLoc, Context.getObjCInterfaceType(IDecl), 917 diag::err_undef_interface)) { 918 CDecl->setInvalidDecl(); 919 } 920 921 // FIXME: PushOnScopeChains? 922 CurContext->addDecl(CDecl); 923 924 // If the interface is deprecated/unavailable, warn/error about it. 925 if (IDecl) 926 DiagnoseUseOfDecl(IDecl, ClassLoc); 927 928 /// Check that CatName, category name, is not used in another implementation. 929 if (CatIDecl) { 930 if (CatIDecl->getImplementation()) { 931 Diag(ClassLoc, diag::err_dup_implementation_category) << ClassName 932 << CatName; 933 Diag(CatIDecl->getImplementation()->getLocation(), 934 diag::note_previous_definition); 935 } else { 936 CatIDecl->setImplementation(CDecl); 937 // Warn on implementating category of deprecated class under 938 // -Wdeprecated-implementations flag. 939 DiagnoseObjCImplementedDeprecations(*this, 940 dyn_cast<NamedDecl>(IDecl), 941 CDecl->getLocation(), 2); 942 } 943 } 944 945 CheckObjCDeclScope(CDecl); 946 return ActOnObjCContainerStartDefinition(CDecl); 947} 948 949Decl *Sema::ActOnStartClassImplementation( 950 SourceLocation AtClassImplLoc, 951 IdentifierInfo *ClassName, SourceLocation ClassLoc, 952 IdentifierInfo *SuperClassname, 953 SourceLocation SuperClassLoc) { 954 ObjCInterfaceDecl* IDecl = 0; 955 // Check for another declaration kind with the same name. 956 NamedDecl *PrevDecl 957 = LookupSingleName(TUScope, ClassName, ClassLoc, LookupOrdinaryName, 958 ForRedeclaration); 959 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 960 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName; 961 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 962 } else if ((IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl))) { 963 RequireCompleteType(ClassLoc, Context.getObjCInterfaceType(IDecl), 964 diag::warn_undef_interface); 965 } else { 966 // We did not find anything with the name ClassName; try to correct for 967 // typos in the class name. 968 ObjCInterfaceValidatorCCC Validator; 969 if (TypoCorrection Corrected = CorrectTypo( 970 DeclarationNameInfo(ClassName, ClassLoc), LookupOrdinaryName, TUScope, 971 NULL, Validator)) { 972 // Suggest the (potentially) correct interface name. However, put the 973 // fix-it hint itself in a separate note, since changing the name in 974 // the warning would make the fix-it change semantics.However, don't 975 // provide a code-modification hint or use the typo name for recovery, 976 // because this is just a warning. The program may actually be correct. 977 IDecl = Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>(); 978 DeclarationName CorrectedName = Corrected.getCorrection(); 979 Diag(ClassLoc, diag::warn_undef_interface_suggest) 980 << ClassName << CorrectedName; 981 Diag(IDecl->getLocation(), diag::note_previous_decl) << CorrectedName 982 << FixItHint::CreateReplacement(ClassLoc, CorrectedName.getAsString()); 983 IDecl = 0; 984 } else { 985 Diag(ClassLoc, diag::warn_undef_interface) << ClassName; 986 } 987 } 988 989 // Check that super class name is valid class name 990 ObjCInterfaceDecl* SDecl = 0; 991 if (SuperClassname) { 992 // Check if a different kind of symbol declared in this scope. 993 PrevDecl = LookupSingleName(TUScope, SuperClassname, SuperClassLoc, 994 LookupOrdinaryName); 995 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 996 Diag(SuperClassLoc, diag::err_redefinition_different_kind) 997 << SuperClassname; 998 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 999 } else { 1000 SDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 1001 if (SDecl && !SDecl->hasDefinition()) 1002 SDecl = 0; 1003 if (!SDecl) 1004 Diag(SuperClassLoc, diag::err_undef_superclass) 1005 << SuperClassname << ClassName; 1006 else if (IDecl && !declaresSameEntity(IDecl->getSuperClass(), SDecl)) { 1007 // This implementation and its interface do not have the same 1008 // super class. 1009 Diag(SuperClassLoc, diag::err_conflicting_super_class) 1010 << SDecl->getDeclName(); 1011 Diag(SDecl->getLocation(), diag::note_previous_definition); 1012 } 1013 } 1014 } 1015 1016 if (!IDecl) { 1017 // Legacy case of @implementation with no corresponding @interface. 1018 // Build, chain & install the interface decl into the identifier. 1019 1020 // FIXME: Do we support attributes on the @implementation? If so we should 1021 // copy them over. 1022 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtClassImplLoc, 1023 ClassName, /*PrevDecl=*/0, ClassLoc, 1024 true); 1025 IDecl->startDefinition(); 1026 if (SDecl) { 1027 IDecl->setSuperClass(SDecl); 1028 IDecl->setSuperClassLoc(SuperClassLoc); 1029 IDecl->setEndOfDefinitionLoc(SuperClassLoc); 1030 } else { 1031 IDecl->setEndOfDefinitionLoc(ClassLoc); 1032 } 1033 1034 PushOnScopeChains(IDecl, TUScope); 1035 } else { 1036 // Mark the interface as being completed, even if it was just as 1037 // @class ....; 1038 // declaration; the user cannot reopen it. 1039 if (!IDecl->hasDefinition()) 1040 IDecl->startDefinition(); 1041 } 1042 1043 ObjCImplementationDecl* IMPDecl = 1044 ObjCImplementationDecl::Create(Context, CurContext, IDecl, SDecl, 1045 ClassLoc, AtClassImplLoc); 1046 1047 if (CheckObjCDeclScope(IMPDecl)) 1048 return ActOnObjCContainerStartDefinition(IMPDecl); 1049 1050 // Check that there is no duplicate implementation of this class. 1051 if (IDecl->getImplementation()) { 1052 // FIXME: Don't leak everything! 1053 Diag(ClassLoc, diag::err_dup_implementation_class) << ClassName; 1054 Diag(IDecl->getImplementation()->getLocation(), 1055 diag::note_previous_definition); 1056 } else { // add it to the list. 1057 IDecl->setImplementation(IMPDecl); 1058 PushOnScopeChains(IMPDecl, TUScope); 1059 // Warn on implementating deprecated class under 1060 // -Wdeprecated-implementations flag. 1061 DiagnoseObjCImplementedDeprecations(*this, 1062 dyn_cast<NamedDecl>(IDecl), 1063 IMPDecl->getLocation(), 1); 1064 } 1065 return ActOnObjCContainerStartDefinition(IMPDecl); 1066} 1067 1068Sema::DeclGroupPtrTy 1069Sema::ActOnFinishObjCImplementation(Decl *ObjCImpDecl, ArrayRef<Decl *> Decls) { 1070 SmallVector<Decl *, 64> DeclsInGroup; 1071 DeclsInGroup.reserve(Decls.size() + 1); 1072 1073 for (unsigned i = 0, e = Decls.size(); i != e; ++i) { 1074 Decl *Dcl = Decls[i]; 1075 if (!Dcl) 1076 continue; 1077 if (Dcl->getDeclContext()->isFileContext()) 1078 Dcl->setTopLevelDeclInObjCContainer(); 1079 DeclsInGroup.push_back(Dcl); 1080 } 1081 1082 DeclsInGroup.push_back(ObjCImpDecl); 1083 1084 return BuildDeclaratorGroup(DeclsInGroup.data(), DeclsInGroup.size(), false); 1085} 1086 1087void Sema::CheckImplementationIvars(ObjCImplementationDecl *ImpDecl, 1088 ObjCIvarDecl **ivars, unsigned numIvars, 1089 SourceLocation RBrace) { 1090 assert(ImpDecl && "missing implementation decl"); 1091 ObjCInterfaceDecl* IDecl = ImpDecl->getClassInterface(); 1092 if (!IDecl) 1093 return; 1094 /// Check case of non-existing \@interface decl. 1095 /// (legacy objective-c \@implementation decl without an \@interface decl). 1096 /// Add implementations's ivar to the synthesize class's ivar list. 1097 if (IDecl->isImplicitInterfaceDecl()) { 1098 IDecl->setEndOfDefinitionLoc(RBrace); 1099 // Add ivar's to class's DeclContext. 1100 for (unsigned i = 0, e = numIvars; i != e; ++i) { 1101 ivars[i]->setLexicalDeclContext(ImpDecl); 1102 IDecl->makeDeclVisibleInContext(ivars[i]); 1103 ImpDecl->addDecl(ivars[i]); 1104 } 1105 1106 return; 1107 } 1108 // If implementation has empty ivar list, just return. 1109 if (numIvars == 0) 1110 return; 1111 1112 assert(ivars && "missing @implementation ivars"); 1113 if (LangOpts.ObjCRuntime.isNonFragile()) { 1114 if (ImpDecl->getSuperClass()) 1115 Diag(ImpDecl->getLocation(), diag::warn_on_superclass_use); 1116 for (unsigned i = 0; i < numIvars; i++) { 1117 ObjCIvarDecl* ImplIvar = ivars[i]; 1118 if (const ObjCIvarDecl *ClsIvar = 1119 IDecl->getIvarDecl(ImplIvar->getIdentifier())) { 1120 Diag(ImplIvar->getLocation(), diag::err_duplicate_ivar_declaration); 1121 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 1122 continue; 1123 } 1124 // Instance ivar to Implementation's DeclContext. 1125 ImplIvar->setLexicalDeclContext(ImpDecl); 1126 IDecl->makeDeclVisibleInContext(ImplIvar); 1127 ImpDecl->addDecl(ImplIvar); 1128 } 1129 return; 1130 } 1131 // Check interface's Ivar list against those in the implementation. 1132 // names and types must match. 1133 // 1134 unsigned j = 0; 1135 ObjCInterfaceDecl::ivar_iterator 1136 IVI = IDecl->ivar_begin(), IVE = IDecl->ivar_end(); 1137 for (; numIvars > 0 && IVI != IVE; ++IVI) { 1138 ObjCIvarDecl* ImplIvar = ivars[j++]; 1139 ObjCIvarDecl* ClsIvar = *IVI; 1140 assert (ImplIvar && "missing implementation ivar"); 1141 assert (ClsIvar && "missing class ivar"); 1142 1143 // First, make sure the types match. 1144 if (!Context.hasSameType(ImplIvar->getType(), ClsIvar->getType())) { 1145 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_type) 1146 << ImplIvar->getIdentifier() 1147 << ImplIvar->getType() << ClsIvar->getType(); 1148 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 1149 } else if (ImplIvar->isBitField() && ClsIvar->isBitField() && 1150 ImplIvar->getBitWidthValue(Context) != 1151 ClsIvar->getBitWidthValue(Context)) { 1152 Diag(ImplIvar->getBitWidth()->getLocStart(), 1153 diag::err_conflicting_ivar_bitwidth) << ImplIvar->getIdentifier(); 1154 Diag(ClsIvar->getBitWidth()->getLocStart(), 1155 diag::note_previous_definition); 1156 } 1157 // Make sure the names are identical. 1158 if (ImplIvar->getIdentifier() != ClsIvar->getIdentifier()) { 1159 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_name) 1160 << ImplIvar->getIdentifier() << ClsIvar->getIdentifier(); 1161 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 1162 } 1163 --numIvars; 1164 } 1165 1166 if (numIvars > 0) 1167 Diag(ivars[j]->getLocation(), diag::err_inconsistant_ivar_count); 1168 else if (IVI != IVE) 1169 Diag(IVI->getLocation(), diag::err_inconsistant_ivar_count); 1170} 1171 1172void Sema::WarnUndefinedMethod(SourceLocation ImpLoc, ObjCMethodDecl *method, 1173 bool &IncompleteImpl, unsigned DiagID) { 1174 // No point warning no definition of method which is 'unavailable'. 1175 switch (method->getAvailability()) { 1176 case AR_Available: 1177 case AR_Deprecated: 1178 break; 1179 1180 // Don't warn about unavailable or not-yet-introduced methods. 1181 case AR_NotYetIntroduced: 1182 case AR_Unavailable: 1183 return; 1184 } 1185 1186 // FIXME: For now ignore 'IncompleteImpl'. 1187 // Previously we grouped all unimplemented methods under a single 1188 // warning, but some users strongly voiced that they would prefer 1189 // separate warnings. We will give that approach a try, as that 1190 // matches what we do with protocols. 1191 1192 Diag(ImpLoc, DiagID) << method->getDeclName(); 1193 1194 // Issue a note to the original declaration. 1195 SourceLocation MethodLoc = method->getLocStart(); 1196 if (MethodLoc.isValid()) 1197 Diag(MethodLoc, diag::note_method_declared_at) << method; 1198} 1199 1200/// Determines if type B can be substituted for type A. Returns true if we can 1201/// guarantee that anything that the user will do to an object of type A can 1202/// also be done to an object of type B. This is trivially true if the two 1203/// types are the same, or if B is a subclass of A. It becomes more complex 1204/// in cases where protocols are involved. 1205/// 1206/// Object types in Objective-C describe the minimum requirements for an 1207/// object, rather than providing a complete description of a type. For 1208/// example, if A is a subclass of B, then B* may refer to an instance of A. 1209/// The principle of substitutability means that we may use an instance of A 1210/// anywhere that we may use an instance of B - it will implement all of the 1211/// ivars of B and all of the methods of B. 1212/// 1213/// This substitutability is important when type checking methods, because 1214/// the implementation may have stricter type definitions than the interface. 1215/// The interface specifies minimum requirements, but the implementation may 1216/// have more accurate ones. For example, a method may privately accept 1217/// instances of B, but only publish that it accepts instances of A. Any 1218/// object passed to it will be type checked against B, and so will implicitly 1219/// by a valid A*. Similarly, a method may return a subclass of the class that 1220/// it is declared as returning. 1221/// 1222/// This is most important when considering subclassing. A method in a 1223/// subclass must accept any object as an argument that its superclass's 1224/// implementation accepts. It may, however, accept a more general type 1225/// without breaking substitutability (i.e. you can still use the subclass 1226/// anywhere that you can use the superclass, but not vice versa). The 1227/// converse requirement applies to return types: the return type for a 1228/// subclass method must be a valid object of the kind that the superclass 1229/// advertises, but it may be specified more accurately. This avoids the need 1230/// for explicit down-casting by callers. 1231/// 1232/// Note: This is a stricter requirement than for assignment. 1233static bool isObjCTypeSubstitutable(ASTContext &Context, 1234 const ObjCObjectPointerType *A, 1235 const ObjCObjectPointerType *B, 1236 bool rejectId) { 1237 // Reject a protocol-unqualified id. 1238 if (rejectId && B->isObjCIdType()) return false; 1239 1240 // If B is a qualified id, then A must also be a qualified id and it must 1241 // implement all of the protocols in B. It may not be a qualified class. 1242 // For example, MyClass<A> can be assigned to id<A>, but MyClass<A> is a 1243 // stricter definition so it is not substitutable for id<A>. 1244 if (B->isObjCQualifiedIdType()) { 1245 return A->isObjCQualifiedIdType() && 1246 Context.ObjCQualifiedIdTypesAreCompatible(QualType(A, 0), 1247 QualType(B,0), 1248 false); 1249 } 1250 1251 /* 1252 // id is a special type that bypasses type checking completely. We want a 1253 // warning when it is used in one place but not another. 1254 if (C.isObjCIdType(A) || C.isObjCIdType(B)) return false; 1255 1256 1257 // If B is a qualified id, then A must also be a qualified id (which it isn't 1258 // if we've got this far) 1259 if (B->isObjCQualifiedIdType()) return false; 1260 */ 1261 1262 // Now we know that A and B are (potentially-qualified) class types. The 1263 // normal rules for assignment apply. 1264 return Context.canAssignObjCInterfaces(A, B); 1265} 1266 1267static SourceRange getTypeRange(TypeSourceInfo *TSI) { 1268 return (TSI ? TSI->getTypeLoc().getSourceRange() : SourceRange()); 1269} 1270 1271static bool CheckMethodOverrideReturn(Sema &S, 1272 ObjCMethodDecl *MethodImpl, 1273 ObjCMethodDecl *MethodDecl, 1274 bool IsProtocolMethodDecl, 1275 bool IsOverridingMode, 1276 bool Warn) { 1277 if (IsProtocolMethodDecl && 1278 (MethodDecl->getObjCDeclQualifier() != 1279 MethodImpl->getObjCDeclQualifier())) { 1280 if (Warn) { 1281 S.Diag(MethodImpl->getLocation(), 1282 (IsOverridingMode ? 1283 diag::warn_conflicting_overriding_ret_type_modifiers 1284 : diag::warn_conflicting_ret_type_modifiers)) 1285 << MethodImpl->getDeclName() 1286 << getTypeRange(MethodImpl->getResultTypeSourceInfo()); 1287 S.Diag(MethodDecl->getLocation(), diag::note_previous_declaration) 1288 << getTypeRange(MethodDecl->getResultTypeSourceInfo()); 1289 } 1290 else 1291 return false; 1292 } 1293 1294 if (S.Context.hasSameUnqualifiedType(MethodImpl->getResultType(), 1295 MethodDecl->getResultType())) 1296 return true; 1297 if (!Warn) 1298 return false; 1299 1300 unsigned DiagID = 1301 IsOverridingMode ? diag::warn_conflicting_overriding_ret_types 1302 : diag::warn_conflicting_ret_types; 1303 1304 // Mismatches between ObjC pointers go into a different warning 1305 // category, and sometimes they're even completely whitelisted. 1306 if (const ObjCObjectPointerType *ImplPtrTy = 1307 MethodImpl->getResultType()->getAs<ObjCObjectPointerType>()) { 1308 if (const ObjCObjectPointerType *IfacePtrTy = 1309 MethodDecl->getResultType()->getAs<ObjCObjectPointerType>()) { 1310 // Allow non-matching return types as long as they don't violate 1311 // the principle of substitutability. Specifically, we permit 1312 // return types that are subclasses of the declared return type, 1313 // or that are more-qualified versions of the declared type. 1314 if (isObjCTypeSubstitutable(S.Context, IfacePtrTy, ImplPtrTy, false)) 1315 return false; 1316 1317 DiagID = 1318 IsOverridingMode ? diag::warn_non_covariant_overriding_ret_types 1319 : diag::warn_non_covariant_ret_types; 1320 } 1321 } 1322 1323 S.Diag(MethodImpl->getLocation(), DiagID) 1324 << MethodImpl->getDeclName() 1325 << MethodDecl->getResultType() 1326 << MethodImpl->getResultType() 1327 << getTypeRange(MethodImpl->getResultTypeSourceInfo()); 1328 S.Diag(MethodDecl->getLocation(), 1329 IsOverridingMode ? diag::note_previous_declaration 1330 : diag::note_previous_definition) 1331 << getTypeRange(MethodDecl->getResultTypeSourceInfo()); 1332 return false; 1333} 1334 1335static bool CheckMethodOverrideParam(Sema &S, 1336 ObjCMethodDecl *MethodImpl, 1337 ObjCMethodDecl *MethodDecl, 1338 ParmVarDecl *ImplVar, 1339 ParmVarDecl *IfaceVar, 1340 bool IsProtocolMethodDecl, 1341 bool IsOverridingMode, 1342 bool Warn) { 1343 if (IsProtocolMethodDecl && 1344 (ImplVar->getObjCDeclQualifier() != 1345 IfaceVar->getObjCDeclQualifier())) { 1346 if (Warn) { 1347 if (IsOverridingMode) 1348 S.Diag(ImplVar->getLocation(), 1349 diag::warn_conflicting_overriding_param_modifiers) 1350 << getTypeRange(ImplVar->getTypeSourceInfo()) 1351 << MethodImpl->getDeclName(); 1352 else S.Diag(ImplVar->getLocation(), 1353 diag::warn_conflicting_param_modifiers) 1354 << getTypeRange(ImplVar->getTypeSourceInfo()) 1355 << MethodImpl->getDeclName(); 1356 S.Diag(IfaceVar->getLocation(), diag::note_previous_declaration) 1357 << getTypeRange(IfaceVar->getTypeSourceInfo()); 1358 } 1359 else 1360 return false; 1361 } 1362 1363 QualType ImplTy = ImplVar->getType(); 1364 QualType IfaceTy = IfaceVar->getType(); 1365 1366 if (S.Context.hasSameUnqualifiedType(ImplTy, IfaceTy)) 1367 return true; 1368 1369 if (!Warn) 1370 return false; 1371 unsigned DiagID = 1372 IsOverridingMode ? diag::warn_conflicting_overriding_param_types 1373 : diag::warn_conflicting_param_types; 1374 1375 // Mismatches between ObjC pointers go into a different warning 1376 // category, and sometimes they're even completely whitelisted. 1377 if (const ObjCObjectPointerType *ImplPtrTy = 1378 ImplTy->getAs<ObjCObjectPointerType>()) { 1379 if (const ObjCObjectPointerType *IfacePtrTy = 1380 IfaceTy->getAs<ObjCObjectPointerType>()) { 1381 // Allow non-matching argument types as long as they don't 1382 // violate the principle of substitutability. Specifically, the 1383 // implementation must accept any objects that the superclass 1384 // accepts, however it may also accept others. 1385 if (isObjCTypeSubstitutable(S.Context, ImplPtrTy, IfacePtrTy, true)) 1386 return false; 1387 1388 DiagID = 1389 IsOverridingMode ? diag::warn_non_contravariant_overriding_param_types 1390 : diag::warn_non_contravariant_param_types; 1391 } 1392 } 1393 1394 S.Diag(ImplVar->getLocation(), DiagID) 1395 << getTypeRange(ImplVar->getTypeSourceInfo()) 1396 << MethodImpl->getDeclName() << IfaceTy << ImplTy; 1397 S.Diag(IfaceVar->getLocation(), 1398 (IsOverridingMode ? diag::note_previous_declaration 1399 : diag::note_previous_definition)) 1400 << getTypeRange(IfaceVar->getTypeSourceInfo()); 1401 return false; 1402} 1403 1404/// In ARC, check whether the conventional meanings of the two methods 1405/// match. If they don't, it's a hard error. 1406static bool checkMethodFamilyMismatch(Sema &S, ObjCMethodDecl *impl, 1407 ObjCMethodDecl *decl) { 1408 ObjCMethodFamily implFamily = impl->getMethodFamily(); 1409 ObjCMethodFamily declFamily = decl->getMethodFamily(); 1410 if (implFamily == declFamily) return false; 1411 1412 // Since conventions are sorted by selector, the only possibility is 1413 // that the types differ enough to cause one selector or the other 1414 // to fall out of the family. 1415 assert(implFamily == OMF_None || declFamily == OMF_None); 1416 1417 // No further diagnostics required on invalid declarations. 1418 if (impl->isInvalidDecl() || decl->isInvalidDecl()) return true; 1419 1420 const ObjCMethodDecl *unmatched = impl; 1421 ObjCMethodFamily family = declFamily; 1422 unsigned errorID = diag::err_arc_lost_method_convention; 1423 unsigned noteID = diag::note_arc_lost_method_convention; 1424 if (declFamily == OMF_None) { 1425 unmatched = decl; 1426 family = implFamily; 1427 errorID = diag::err_arc_gained_method_convention; 1428 noteID = diag::note_arc_gained_method_convention; 1429 } 1430 1431 // Indexes into a %select clause in the diagnostic. 1432 enum FamilySelector { 1433 F_alloc, F_copy, F_mutableCopy = F_copy, F_init, F_new 1434 }; 1435 FamilySelector familySelector = FamilySelector(); 1436 1437 switch (family) { 1438 case OMF_None: llvm_unreachable("logic error, no method convention"); 1439 case OMF_retain: 1440 case OMF_release: 1441 case OMF_autorelease: 1442 case OMF_dealloc: 1443 case OMF_finalize: 1444 case OMF_retainCount: 1445 case OMF_self: 1446 case OMF_performSelector: 1447 // Mismatches for these methods don't change ownership 1448 // conventions, so we don't care. 1449 return false; 1450 1451 case OMF_init: familySelector = F_init; break; 1452 case OMF_alloc: familySelector = F_alloc; break; 1453 case OMF_copy: familySelector = F_copy; break; 1454 case OMF_mutableCopy: familySelector = F_mutableCopy; break; 1455 case OMF_new: familySelector = F_new; break; 1456 } 1457 1458 enum ReasonSelector { R_NonObjectReturn, R_UnrelatedReturn }; 1459 ReasonSelector reasonSelector; 1460 1461 // The only reason these methods don't fall within their families is 1462 // due to unusual result types. 1463 if (unmatched->getResultType()->isObjCObjectPointerType()) { 1464 reasonSelector = R_UnrelatedReturn; 1465 } else { 1466 reasonSelector = R_NonObjectReturn; 1467 } 1468 1469 S.Diag(impl->getLocation(), errorID) << familySelector << reasonSelector; 1470 S.Diag(decl->getLocation(), noteID) << familySelector << reasonSelector; 1471 1472 return true; 1473} 1474 1475void Sema::WarnConflictingTypedMethods(ObjCMethodDecl *ImpMethodDecl, 1476 ObjCMethodDecl *MethodDecl, 1477 bool IsProtocolMethodDecl) { 1478 if (getLangOpts().ObjCAutoRefCount && 1479 checkMethodFamilyMismatch(*this, ImpMethodDecl, MethodDecl)) 1480 return; 1481 1482 CheckMethodOverrideReturn(*this, ImpMethodDecl, MethodDecl, 1483 IsProtocolMethodDecl, false, 1484 true); 1485 1486 for (ObjCMethodDecl::param_iterator IM = ImpMethodDecl->param_begin(), 1487 IF = MethodDecl->param_begin(), EM = ImpMethodDecl->param_end(), 1488 EF = MethodDecl->param_end(); 1489 IM != EM && IF != EF; ++IM, ++IF) { 1490 CheckMethodOverrideParam(*this, ImpMethodDecl, MethodDecl, *IM, *IF, 1491 IsProtocolMethodDecl, false, true); 1492 } 1493 1494 if (ImpMethodDecl->isVariadic() != MethodDecl->isVariadic()) { 1495 Diag(ImpMethodDecl->getLocation(), 1496 diag::warn_conflicting_variadic); 1497 Diag(MethodDecl->getLocation(), diag::note_previous_declaration); 1498 } 1499} 1500 1501void Sema::CheckConflictingOverridingMethod(ObjCMethodDecl *Method, 1502 ObjCMethodDecl *Overridden, 1503 bool IsProtocolMethodDecl) { 1504 1505 CheckMethodOverrideReturn(*this, Method, Overridden, 1506 IsProtocolMethodDecl, true, 1507 true); 1508 1509 for (ObjCMethodDecl::param_iterator IM = Method->param_begin(), 1510 IF = Overridden->param_begin(), EM = Method->param_end(), 1511 EF = Overridden->param_end(); 1512 IM != EM && IF != EF; ++IM, ++IF) { 1513 CheckMethodOverrideParam(*this, Method, Overridden, *IM, *IF, 1514 IsProtocolMethodDecl, true, true); 1515 } 1516 1517 if (Method->isVariadic() != Overridden->isVariadic()) { 1518 Diag(Method->getLocation(), 1519 diag::warn_conflicting_overriding_variadic); 1520 Diag(Overridden->getLocation(), diag::note_previous_declaration); 1521 } 1522} 1523 1524/// WarnExactTypedMethods - This routine issues a warning if method 1525/// implementation declaration matches exactly that of its declaration. 1526void Sema::WarnExactTypedMethods(ObjCMethodDecl *ImpMethodDecl, 1527 ObjCMethodDecl *MethodDecl, 1528 bool IsProtocolMethodDecl) { 1529 // don't issue warning when protocol method is optional because primary 1530 // class is not required to implement it and it is safe for protocol 1531 // to implement it. 1532 if (MethodDecl->getImplementationControl() == ObjCMethodDecl::Optional) 1533 return; 1534 // don't issue warning when primary class's method is 1535 // depecated/unavailable. 1536 if (MethodDecl->hasAttr<UnavailableAttr>() || 1537 MethodDecl->hasAttr<DeprecatedAttr>()) 1538 return; 1539 1540 bool match = CheckMethodOverrideReturn(*this, ImpMethodDecl, MethodDecl, 1541 IsProtocolMethodDecl, false, false); 1542 if (match) 1543 for (ObjCMethodDecl::param_iterator IM = ImpMethodDecl->param_begin(), 1544 IF = MethodDecl->param_begin(), EM = ImpMethodDecl->param_end(), 1545 EF = MethodDecl->param_end(); 1546 IM != EM && IF != EF; ++IM, ++IF) { 1547 match = CheckMethodOverrideParam(*this, ImpMethodDecl, MethodDecl, 1548 *IM, *IF, 1549 IsProtocolMethodDecl, false, false); 1550 if (!match) 1551 break; 1552 } 1553 if (match) 1554 match = (ImpMethodDecl->isVariadic() == MethodDecl->isVariadic()); 1555 if (match) 1556 match = !(MethodDecl->isClassMethod() && 1557 MethodDecl->getSelector() == GetNullarySelector("load", Context)); 1558 1559 if (match) { 1560 Diag(ImpMethodDecl->getLocation(), 1561 diag::warn_category_method_impl_match); 1562 Diag(MethodDecl->getLocation(), diag::note_method_declared_at) 1563 << MethodDecl->getDeclName(); 1564 } 1565} 1566 1567/// FIXME: Type hierarchies in Objective-C can be deep. We could most likely 1568/// improve the efficiency of selector lookups and type checking by associating 1569/// with each protocol / interface / category the flattened instance tables. If 1570/// we used an immutable set to keep the table then it wouldn't add significant 1571/// memory cost and it would be handy for lookups. 1572 1573/// CheckProtocolMethodDefs - This routine checks unimplemented methods 1574/// Declared in protocol, and those referenced by it. 1575void Sema::CheckProtocolMethodDefs(SourceLocation ImpLoc, 1576 ObjCProtocolDecl *PDecl, 1577 bool& IncompleteImpl, 1578 const SelectorSet &InsMap, 1579 const SelectorSet &ClsMap, 1580 ObjCContainerDecl *CDecl) { 1581 ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl); 1582 ObjCInterfaceDecl *IDecl = C ? C->getClassInterface() 1583 : dyn_cast<ObjCInterfaceDecl>(CDecl); 1584 assert (IDecl && "CheckProtocolMethodDefs - IDecl is null"); 1585 1586 ObjCInterfaceDecl *Super = IDecl->getSuperClass(); 1587 ObjCInterfaceDecl *NSIDecl = 0; 1588 if (getLangOpts().ObjCRuntime.isNeXTFamily()) { 1589 // check to see if class implements forwardInvocation method and objects 1590 // of this class are derived from 'NSProxy' so that to forward requests 1591 // from one object to another. 1592 // Under such conditions, which means that every method possible is 1593 // implemented in the class, we should not issue "Method definition not 1594 // found" warnings. 1595 // FIXME: Use a general GetUnarySelector method for this. 1596 IdentifierInfo* II = &Context.Idents.get("forwardInvocation"); 1597 Selector fISelector = Context.Selectors.getSelector(1, &II); 1598 if (InsMap.count(fISelector)) 1599 // Is IDecl derived from 'NSProxy'? If so, no instance methods 1600 // need be implemented in the implementation. 1601 NSIDecl = IDecl->lookupInheritedClass(&Context.Idents.get("NSProxy")); 1602 } 1603 1604 // If this is a forward protocol declaration, get its definition. 1605 if (!PDecl->isThisDeclarationADefinition() && 1606 PDecl->getDefinition()) 1607 PDecl = PDecl->getDefinition(); 1608 1609 // If a method lookup fails locally we still need to look and see if 1610 // the method was implemented by a base class or an inherited 1611 // protocol. This lookup is slow, but occurs rarely in correct code 1612 // and otherwise would terminate in a warning. 1613 1614 // check unimplemented instance methods. 1615 if (!NSIDecl) 1616 for (ObjCProtocolDecl::instmeth_iterator I = PDecl->instmeth_begin(), 1617 E = PDecl->instmeth_end(); I != E; ++I) { 1618 ObjCMethodDecl *method = *I; 1619 if (method->getImplementationControl() != ObjCMethodDecl::Optional && 1620 !method->isPropertyAccessor() && 1621 !InsMap.count(method->getSelector()) && 1622 (!Super || !Super->lookupInstanceMethod(method->getSelector()))) { 1623 // If a method is not implemented in the category implementation but 1624 // has been declared in its primary class, superclass, 1625 // or in one of their protocols, no need to issue the warning. 1626 // This is because method will be implemented in the primary class 1627 // or one of its super class implementation. 1628 1629 // Ugly, but necessary. Method declared in protcol might have 1630 // have been synthesized due to a property declared in the class which 1631 // uses the protocol. 1632 if (ObjCMethodDecl *MethodInClass = 1633 IDecl->lookupInstanceMethod(method->getSelector(), 1634 true /*shallowCategoryLookup*/)) 1635 if (C || MethodInClass->isPropertyAccessor()) 1636 continue; 1637 unsigned DIAG = diag::warn_unimplemented_protocol_method; 1638 if (Diags.getDiagnosticLevel(DIAG, ImpLoc) 1639 != DiagnosticsEngine::Ignored) { 1640 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG); 1641 Diag(CDecl->getLocation(), diag::note_required_for_protocol_at) 1642 << PDecl->getDeclName(); 1643 } 1644 } 1645 } 1646 // check unimplemented class methods 1647 for (ObjCProtocolDecl::classmeth_iterator 1648 I = PDecl->classmeth_begin(), E = PDecl->classmeth_end(); 1649 I != E; ++I) { 1650 ObjCMethodDecl *method = *I; 1651 if (method->getImplementationControl() != ObjCMethodDecl::Optional && 1652 !ClsMap.count(method->getSelector()) && 1653 (!Super || !Super->lookupClassMethod(method->getSelector()))) { 1654 // See above comment for instance method lookups. 1655 if (C && IDecl->lookupClassMethod(method->getSelector(), 1656 true /*shallowCategoryLookup*/)) 1657 continue; 1658 unsigned DIAG = diag::warn_unimplemented_protocol_method; 1659 if (Diags.getDiagnosticLevel(DIAG, ImpLoc) != 1660 DiagnosticsEngine::Ignored) { 1661 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG); 1662 Diag(IDecl->getLocation(), diag::note_required_for_protocol_at) << 1663 PDecl->getDeclName(); 1664 } 1665 } 1666 } 1667 // Check on this protocols's referenced protocols, recursively. 1668 for (ObjCProtocolDecl::protocol_iterator PI = PDecl->protocol_begin(), 1669 E = PDecl->protocol_end(); PI != E; ++PI) 1670 CheckProtocolMethodDefs(ImpLoc, *PI, IncompleteImpl, InsMap, ClsMap, CDecl); 1671} 1672 1673/// MatchAllMethodDeclarations - Check methods declared in interface 1674/// or protocol against those declared in their implementations. 1675/// 1676void Sema::MatchAllMethodDeclarations(const SelectorSet &InsMap, 1677 const SelectorSet &ClsMap, 1678 SelectorSet &InsMapSeen, 1679 SelectorSet &ClsMapSeen, 1680 ObjCImplDecl* IMPDecl, 1681 ObjCContainerDecl* CDecl, 1682 bool &IncompleteImpl, 1683 bool ImmediateClass, 1684 bool WarnCategoryMethodImpl) { 1685 // Check and see if instance methods in class interface have been 1686 // implemented in the implementation class. If so, their types match. 1687 for (ObjCInterfaceDecl::instmeth_iterator I = CDecl->instmeth_begin(), 1688 E = CDecl->instmeth_end(); I != E; ++I) { 1689 if (InsMapSeen.count((*I)->getSelector())) 1690 continue; 1691 InsMapSeen.insert((*I)->getSelector()); 1692 if (!(*I)->isPropertyAccessor() && 1693 !InsMap.count((*I)->getSelector())) { 1694 if (ImmediateClass) 1695 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl, 1696 diag::warn_undef_method_impl); 1697 continue; 1698 } else { 1699 ObjCMethodDecl *ImpMethodDecl = 1700 IMPDecl->getInstanceMethod((*I)->getSelector()); 1701 assert(CDecl->getInstanceMethod((*I)->getSelector()) && 1702 "Expected to find the method through lookup as well"); 1703 ObjCMethodDecl *MethodDecl = *I; 1704 // ImpMethodDecl may be null as in a @dynamic property. 1705 if (ImpMethodDecl) { 1706 if (!WarnCategoryMethodImpl) 1707 WarnConflictingTypedMethods(ImpMethodDecl, MethodDecl, 1708 isa<ObjCProtocolDecl>(CDecl)); 1709 else if (!MethodDecl->isPropertyAccessor()) 1710 WarnExactTypedMethods(ImpMethodDecl, MethodDecl, 1711 isa<ObjCProtocolDecl>(CDecl)); 1712 } 1713 } 1714 } 1715 1716 // Check and see if class methods in class interface have been 1717 // implemented in the implementation class. If so, their types match. 1718 for (ObjCInterfaceDecl::classmeth_iterator 1719 I = CDecl->classmeth_begin(), E = CDecl->classmeth_end(); I != E; ++I) { 1720 if (ClsMapSeen.count((*I)->getSelector())) 1721 continue; 1722 ClsMapSeen.insert((*I)->getSelector()); 1723 if (!ClsMap.count((*I)->getSelector())) { 1724 if (ImmediateClass) 1725 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl, 1726 diag::warn_undef_method_impl); 1727 } else { 1728 ObjCMethodDecl *ImpMethodDecl = 1729 IMPDecl->getClassMethod((*I)->getSelector()); 1730 assert(CDecl->getClassMethod((*I)->getSelector()) && 1731 "Expected to find the method through lookup as well"); 1732 ObjCMethodDecl *MethodDecl = *I; 1733 if (!WarnCategoryMethodImpl) 1734 WarnConflictingTypedMethods(ImpMethodDecl, MethodDecl, 1735 isa<ObjCProtocolDecl>(CDecl)); 1736 else 1737 WarnExactTypedMethods(ImpMethodDecl, MethodDecl, 1738 isa<ObjCProtocolDecl>(CDecl)); 1739 } 1740 } 1741 1742 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) { 1743 // when checking that methods in implementation match their declaration, 1744 // i.e. when WarnCategoryMethodImpl is false, check declarations in class 1745 // extension; as well as those in categories. 1746 if (!WarnCategoryMethodImpl) { 1747 for (ObjCInterfaceDecl::visible_categories_iterator 1748 Cat = I->visible_categories_begin(), 1749 CatEnd = I->visible_categories_end(); 1750 Cat != CatEnd; ++Cat) { 1751 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1752 IMPDecl, *Cat, IncompleteImpl, false, 1753 WarnCategoryMethodImpl); 1754 } 1755 } else { 1756 // Also methods in class extensions need be looked at next. 1757 for (ObjCInterfaceDecl::visible_extensions_iterator 1758 Ext = I->visible_extensions_begin(), 1759 ExtEnd = I->visible_extensions_end(); 1760 Ext != ExtEnd; ++Ext) { 1761 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1762 IMPDecl, *Ext, IncompleteImpl, false, 1763 WarnCategoryMethodImpl); 1764 } 1765 } 1766 1767 // Check for any implementation of a methods declared in protocol. 1768 for (ObjCInterfaceDecl::all_protocol_iterator 1769 PI = I->all_referenced_protocol_begin(), 1770 E = I->all_referenced_protocol_end(); PI != E; ++PI) 1771 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1772 IMPDecl, 1773 (*PI), IncompleteImpl, false, 1774 WarnCategoryMethodImpl); 1775 1776 // FIXME. For now, we are not checking for extact match of methods 1777 // in category implementation and its primary class's super class. 1778 if (!WarnCategoryMethodImpl && I->getSuperClass()) 1779 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1780 IMPDecl, 1781 I->getSuperClass(), IncompleteImpl, false); 1782 } 1783} 1784 1785/// CheckCategoryVsClassMethodMatches - Checks that methods implemented in 1786/// category matches with those implemented in its primary class and 1787/// warns each time an exact match is found. 1788void Sema::CheckCategoryVsClassMethodMatches( 1789 ObjCCategoryImplDecl *CatIMPDecl) { 1790 SelectorSet InsMap, ClsMap; 1791 1792 for (ObjCImplementationDecl::instmeth_iterator 1793 I = CatIMPDecl->instmeth_begin(), 1794 E = CatIMPDecl->instmeth_end(); I!=E; ++I) 1795 InsMap.insert((*I)->getSelector()); 1796 1797 for (ObjCImplementationDecl::classmeth_iterator 1798 I = CatIMPDecl->classmeth_begin(), 1799 E = CatIMPDecl->classmeth_end(); I != E; ++I) 1800 ClsMap.insert((*I)->getSelector()); 1801 if (InsMap.empty() && ClsMap.empty()) 1802 return; 1803 1804 // Get category's primary class. 1805 ObjCCategoryDecl *CatDecl = CatIMPDecl->getCategoryDecl(); 1806 if (!CatDecl) 1807 return; 1808 ObjCInterfaceDecl *IDecl = CatDecl->getClassInterface(); 1809 if (!IDecl) 1810 return; 1811 SelectorSet InsMapSeen, ClsMapSeen; 1812 bool IncompleteImpl = false; 1813 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1814 CatIMPDecl, IDecl, 1815 IncompleteImpl, false, 1816 true /*WarnCategoryMethodImpl*/); 1817} 1818 1819void Sema::ImplMethodsVsClassMethods(Scope *S, ObjCImplDecl* IMPDecl, 1820 ObjCContainerDecl* CDecl, 1821 bool IncompleteImpl) { 1822 SelectorSet InsMap; 1823 // Check and see if instance methods in class interface have been 1824 // implemented in the implementation class. 1825 for (ObjCImplementationDecl::instmeth_iterator 1826 I = IMPDecl->instmeth_begin(), E = IMPDecl->instmeth_end(); I!=E; ++I) 1827 InsMap.insert((*I)->getSelector()); 1828 1829 // Check and see if properties declared in the interface have either 1) 1830 // an implementation or 2) there is a @synthesize/@dynamic implementation 1831 // of the property in the @implementation. 1832 if (const ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(CDecl)) 1833 if (!(LangOpts.ObjCDefaultSynthProperties && 1834 LangOpts.ObjCRuntime.isNonFragile()) || 1835 IDecl->isObjCRequiresPropertyDefs()) 1836 DiagnoseUnimplementedProperties(S, IMPDecl, CDecl, InsMap); 1837 1838 SelectorSet ClsMap; 1839 for (ObjCImplementationDecl::classmeth_iterator 1840 I = IMPDecl->classmeth_begin(), 1841 E = IMPDecl->classmeth_end(); I != E; ++I) 1842 ClsMap.insert((*I)->getSelector()); 1843 1844 // Check for type conflict of methods declared in a class/protocol and 1845 // its implementation; if any. 1846 SelectorSet InsMapSeen, ClsMapSeen; 1847 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1848 IMPDecl, CDecl, 1849 IncompleteImpl, true); 1850 1851 // check all methods implemented in category against those declared 1852 // in its primary class. 1853 if (ObjCCategoryImplDecl *CatDecl = 1854 dyn_cast<ObjCCategoryImplDecl>(IMPDecl)) 1855 CheckCategoryVsClassMethodMatches(CatDecl); 1856 1857 // Check the protocol list for unimplemented methods in the @implementation 1858 // class. 1859 // Check and see if class methods in class interface have been 1860 // implemented in the implementation class. 1861 1862 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) { 1863 for (ObjCInterfaceDecl::all_protocol_iterator 1864 PI = I->all_referenced_protocol_begin(), 1865 E = I->all_referenced_protocol_end(); PI != E; ++PI) 1866 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl, 1867 InsMap, ClsMap, I); 1868 // Check class extensions (unnamed categories) 1869 for (ObjCInterfaceDecl::visible_extensions_iterator 1870 Ext = I->visible_extensions_begin(), 1871 ExtEnd = I->visible_extensions_end(); 1872 Ext != ExtEnd; ++Ext) { 1873 ImplMethodsVsClassMethods(S, IMPDecl, *Ext, IncompleteImpl); 1874 } 1875 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl)) { 1876 // For extended class, unimplemented methods in its protocols will 1877 // be reported in the primary class. 1878 if (!C->IsClassExtension()) { 1879 for (ObjCCategoryDecl::protocol_iterator PI = C->protocol_begin(), 1880 E = C->protocol_end(); PI != E; ++PI) 1881 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl, 1882 InsMap, ClsMap, CDecl); 1883 // Report unimplemented properties in the category as well. 1884 // When reporting on missing setter/getters, do not report when 1885 // setter/getter is implemented in category's primary class 1886 // implementation. 1887 if (ObjCInterfaceDecl *ID = C->getClassInterface()) 1888 if (ObjCImplDecl *IMP = ID->getImplementation()) { 1889 for (ObjCImplementationDecl::instmeth_iterator 1890 I = IMP->instmeth_begin(), E = IMP->instmeth_end(); I!=E; ++I) 1891 InsMap.insert((*I)->getSelector()); 1892 } 1893 DiagnoseUnimplementedProperties(S, IMPDecl, CDecl, InsMap); 1894 } 1895 } else 1896 llvm_unreachable("invalid ObjCContainerDecl type."); 1897} 1898 1899/// ActOnForwardClassDeclaration - 1900Sema::DeclGroupPtrTy 1901Sema::ActOnForwardClassDeclaration(SourceLocation AtClassLoc, 1902 IdentifierInfo **IdentList, 1903 SourceLocation *IdentLocs, 1904 unsigned NumElts) { 1905 SmallVector<Decl *, 8> DeclsInGroup; 1906 for (unsigned i = 0; i != NumElts; ++i) { 1907 // Check for another declaration kind with the same name. 1908 NamedDecl *PrevDecl 1909 = LookupSingleName(TUScope, IdentList[i], IdentLocs[i], 1910 LookupOrdinaryName, ForRedeclaration); 1911 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1912 // Maybe we will complain about the shadowed template parameter. 1913 DiagnoseTemplateParameterShadow(AtClassLoc, PrevDecl); 1914 // Just pretend that we didn't see the previous declaration. 1915 PrevDecl = 0; 1916 } 1917 1918 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 1919 // GCC apparently allows the following idiom: 1920 // 1921 // typedef NSObject < XCElementTogglerP > XCElementToggler; 1922 // @class XCElementToggler; 1923 // 1924 // Here we have chosen to ignore the forward class declaration 1925 // with a warning. Since this is the implied behavior. 1926 TypedefNameDecl *TDD = dyn_cast<TypedefNameDecl>(PrevDecl); 1927 if (!TDD || !TDD->getUnderlyingType()->isObjCObjectType()) { 1928 Diag(AtClassLoc, diag::err_redefinition_different_kind) << IdentList[i]; 1929 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1930 } else { 1931 // a forward class declaration matching a typedef name of a class refers 1932 // to the underlying class. Just ignore the forward class with a warning 1933 // as this will force the intended behavior which is to lookup the typedef 1934 // name. 1935 if (isa<ObjCObjectType>(TDD->getUnderlyingType())) { 1936 Diag(AtClassLoc, diag::warn_forward_class_redefinition) << IdentList[i]; 1937 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1938 continue; 1939 } 1940 } 1941 } 1942 1943 // Create a declaration to describe this forward declaration. 1944 ObjCInterfaceDecl *PrevIDecl 1945 = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 1946 ObjCInterfaceDecl *IDecl 1947 = ObjCInterfaceDecl::Create(Context, CurContext, AtClassLoc, 1948 IdentList[i], PrevIDecl, IdentLocs[i]); 1949 IDecl->setAtEndRange(IdentLocs[i]); 1950 1951 PushOnScopeChains(IDecl, TUScope); 1952 CheckObjCDeclScope(IDecl); 1953 DeclsInGroup.push_back(IDecl); 1954 } 1955 1956 return BuildDeclaratorGroup(DeclsInGroup.data(), DeclsInGroup.size(), false); 1957} 1958 1959static bool tryMatchRecordTypes(ASTContext &Context, 1960 Sema::MethodMatchStrategy strategy, 1961 const Type *left, const Type *right); 1962 1963static bool matchTypes(ASTContext &Context, Sema::MethodMatchStrategy strategy, 1964 QualType leftQT, QualType rightQT) { 1965 const Type *left = 1966 Context.getCanonicalType(leftQT).getUnqualifiedType().getTypePtr(); 1967 const Type *right = 1968 Context.getCanonicalType(rightQT).getUnqualifiedType().getTypePtr(); 1969 1970 if (left == right) return true; 1971 1972 // If we're doing a strict match, the types have to match exactly. 1973 if (strategy == Sema::MMS_strict) return false; 1974 1975 if (left->isIncompleteType() || right->isIncompleteType()) return false; 1976 1977 // Otherwise, use this absurdly complicated algorithm to try to 1978 // validate the basic, low-level compatibility of the two types. 1979 1980 // As a minimum, require the sizes and alignments to match. 1981 if (Context.getTypeInfo(left) != Context.getTypeInfo(right)) 1982 return false; 1983 1984 // Consider all the kinds of non-dependent canonical types: 1985 // - functions and arrays aren't possible as return and parameter types 1986 1987 // - vector types of equal size can be arbitrarily mixed 1988 if (isa<VectorType>(left)) return isa<VectorType>(right); 1989 if (isa<VectorType>(right)) return false; 1990 1991 // - references should only match references of identical type 1992 // - structs, unions, and Objective-C objects must match more-or-less 1993 // exactly 1994 // - everything else should be a scalar 1995 if (!left->isScalarType() || !right->isScalarType()) 1996 return tryMatchRecordTypes(Context, strategy, left, right); 1997 1998 // Make scalars agree in kind, except count bools as chars, and group 1999 // all non-member pointers together. 2000 Type::ScalarTypeKind leftSK = left->getScalarTypeKind(); 2001 Type::ScalarTypeKind rightSK = right->getScalarTypeKind(); 2002 if (leftSK == Type::STK_Bool) leftSK = Type::STK_Integral; 2003 if (rightSK == Type::STK_Bool) rightSK = Type::STK_Integral; 2004 if (leftSK == Type::STK_CPointer || leftSK == Type::STK_BlockPointer) 2005 leftSK = Type::STK_ObjCObjectPointer; 2006 if (rightSK == Type::STK_CPointer || rightSK == Type::STK_BlockPointer) 2007 rightSK = Type::STK_ObjCObjectPointer; 2008 2009 // Note that data member pointers and function member pointers don't 2010 // intermix because of the size differences. 2011 2012 return (leftSK == rightSK); 2013} 2014 2015static bool tryMatchRecordTypes(ASTContext &Context, 2016 Sema::MethodMatchStrategy strategy, 2017 const Type *lt, const Type *rt) { 2018 assert(lt && rt && lt != rt); 2019 2020 if (!isa<RecordType>(lt) || !isa<RecordType>(rt)) return false; 2021 RecordDecl *left = cast<RecordType>(lt)->getDecl(); 2022 RecordDecl *right = cast<RecordType>(rt)->getDecl(); 2023 2024 // Require union-hood to match. 2025 if (left->isUnion() != right->isUnion()) return false; 2026 2027 // Require an exact match if either is non-POD. 2028 if ((isa<CXXRecordDecl>(left) && !cast<CXXRecordDecl>(left)->isPOD()) || 2029 (isa<CXXRecordDecl>(right) && !cast<CXXRecordDecl>(right)->isPOD())) 2030 return false; 2031 2032 // Require size and alignment to match. 2033 if (Context.getTypeInfo(lt) != Context.getTypeInfo(rt)) return false; 2034 2035 // Require fields to match. 2036 RecordDecl::field_iterator li = left->field_begin(), le = left->field_end(); 2037 RecordDecl::field_iterator ri = right->field_begin(), re = right->field_end(); 2038 for (; li != le && ri != re; ++li, ++ri) { 2039 if (!matchTypes(Context, strategy, li->getType(), ri->getType())) 2040 return false; 2041 } 2042 return (li == le && ri == re); 2043} 2044 2045/// MatchTwoMethodDeclarations - Checks that two methods have matching type and 2046/// returns true, or false, accordingly. 2047/// TODO: Handle protocol list; such as id<p1,p2> in type comparisons 2048bool Sema::MatchTwoMethodDeclarations(const ObjCMethodDecl *left, 2049 const ObjCMethodDecl *right, 2050 MethodMatchStrategy strategy) { 2051 if (!matchTypes(Context, strategy, 2052 left->getResultType(), right->getResultType())) 2053 return false; 2054 2055 // If either is hidden, it is not considered to match. 2056 if (left->isHidden() || right->isHidden()) 2057 return false; 2058 2059 if (getLangOpts().ObjCAutoRefCount && 2060 (left->hasAttr<NSReturnsRetainedAttr>() 2061 != right->hasAttr<NSReturnsRetainedAttr>() || 2062 left->hasAttr<NSConsumesSelfAttr>() 2063 != right->hasAttr<NSConsumesSelfAttr>())) 2064 return false; 2065 2066 ObjCMethodDecl::param_const_iterator 2067 li = left->param_begin(), le = left->param_end(), ri = right->param_begin(), 2068 re = right->param_end(); 2069 2070 for (; li != le && ri != re; ++li, ++ri) { 2071 assert(ri != right->param_end() && "Param mismatch"); 2072 const ParmVarDecl *lparm = *li, *rparm = *ri; 2073 2074 if (!matchTypes(Context, strategy, lparm->getType(), rparm->getType())) 2075 return false; 2076 2077 if (getLangOpts().ObjCAutoRefCount && 2078 lparm->hasAttr<NSConsumedAttr>() != rparm->hasAttr<NSConsumedAttr>()) 2079 return false; 2080 } 2081 return true; 2082} 2083 2084void Sema::addMethodToGlobalList(ObjCMethodList *List, ObjCMethodDecl *Method) { 2085 // If the list is empty, make it a singleton list. 2086 if (List->Method == 0) { 2087 List->Method = Method; 2088 List->Next = 0; 2089 return; 2090 } 2091 2092 // We've seen a method with this name, see if we have already seen this type 2093 // signature. 2094 ObjCMethodList *Previous = List; 2095 for (; List; Previous = List, List = List->Next) { 2096 if (!MatchTwoMethodDeclarations(Method, List->Method)) 2097 continue; 2098 2099 ObjCMethodDecl *PrevObjCMethod = List->Method; 2100 2101 // Propagate the 'defined' bit. 2102 if (Method->isDefined()) 2103 PrevObjCMethod->setDefined(true); 2104 2105 // If a method is deprecated, push it in the global pool. 2106 // This is used for better diagnostics. 2107 if (Method->isDeprecated()) { 2108 if (!PrevObjCMethod->isDeprecated()) 2109 List->Method = Method; 2110 } 2111 // If new method is unavailable, push it into global pool 2112 // unless previous one is deprecated. 2113 if (Method->isUnavailable()) { 2114 if (PrevObjCMethod->getAvailability() < AR_Deprecated) 2115 List->Method = Method; 2116 } 2117 2118 return; 2119 } 2120 2121 // We have a new signature for an existing method - add it. 2122 // This is extremely rare. Only 1% of Cocoa selectors are "overloaded". 2123 ObjCMethodList *Mem = BumpAlloc.Allocate<ObjCMethodList>(); 2124 Previous->Next = new (Mem) ObjCMethodList(Method, 0); 2125} 2126 2127/// \brief Read the contents of the method pool for a given selector from 2128/// external storage. 2129void Sema::ReadMethodPool(Selector Sel) { 2130 assert(ExternalSource && "We need an external AST source"); 2131 ExternalSource->ReadMethodPool(Sel); 2132} 2133 2134void Sema::AddMethodToGlobalPool(ObjCMethodDecl *Method, bool impl, 2135 bool instance) { 2136 // Ignore methods of invalid containers. 2137 if (cast<Decl>(Method->getDeclContext())->isInvalidDecl()) 2138 return; 2139 2140 if (ExternalSource) 2141 ReadMethodPool(Method->getSelector()); 2142 2143 GlobalMethodPool::iterator Pos = MethodPool.find(Method->getSelector()); 2144 if (Pos == MethodPool.end()) 2145 Pos = MethodPool.insert(std::make_pair(Method->getSelector(), 2146 GlobalMethods())).first; 2147 2148 Method->setDefined(impl); 2149 2150 ObjCMethodList &Entry = instance ? Pos->second.first : Pos->second.second; 2151 addMethodToGlobalList(&Entry, Method); 2152} 2153 2154/// Determines if this is an "acceptable" loose mismatch in the global 2155/// method pool. This exists mostly as a hack to get around certain 2156/// global mismatches which we can't afford to make warnings / errors. 2157/// Really, what we want is a way to take a method out of the global 2158/// method pool. 2159static bool isAcceptableMethodMismatch(ObjCMethodDecl *chosen, 2160 ObjCMethodDecl *other) { 2161 if (!chosen->isInstanceMethod()) 2162 return false; 2163 2164 Selector sel = chosen->getSelector(); 2165 if (!sel.isUnarySelector() || sel.getNameForSlot(0) != "length") 2166 return false; 2167 2168 // Don't complain about mismatches for -length if the method we 2169 // chose has an integral result type. 2170 return (chosen->getResultType()->isIntegerType()); 2171} 2172 2173ObjCMethodDecl *Sema::LookupMethodInGlobalPool(Selector Sel, SourceRange R, 2174 bool receiverIdOrClass, 2175 bool warn, bool instance) { 2176 if (ExternalSource) 2177 ReadMethodPool(Sel); 2178 2179 GlobalMethodPool::iterator Pos = MethodPool.find(Sel); 2180 if (Pos == MethodPool.end()) 2181 return 0; 2182 2183 // Gather the non-hidden methods. 2184 ObjCMethodList &MethList = instance ? Pos->second.first : Pos->second.second; 2185 llvm::SmallVector<ObjCMethodDecl *, 4> Methods; 2186 for (ObjCMethodList *M = &MethList; M; M = M->Next) { 2187 if (M->Method && !M->Method->isHidden()) { 2188 // If we're not supposed to warn about mismatches, we're done. 2189 if (!warn) 2190 return M->Method; 2191 2192 Methods.push_back(M->Method); 2193 } 2194 } 2195 2196 // If there aren't any visible methods, we're done. 2197 // FIXME: Recover if there are any known-but-hidden methods? 2198 if (Methods.empty()) 2199 return 0; 2200 2201 if (Methods.size() == 1) 2202 return Methods[0]; 2203 2204 // We found multiple methods, so we may have to complain. 2205 bool issueDiagnostic = false, issueError = false; 2206 2207 // We support a warning which complains about *any* difference in 2208 // method signature. 2209 bool strictSelectorMatch = 2210 (receiverIdOrClass && warn && 2211 (Diags.getDiagnosticLevel(diag::warn_strict_multiple_method_decl, 2212 R.getBegin()) 2213 != DiagnosticsEngine::Ignored)); 2214 if (strictSelectorMatch) { 2215 for (unsigned I = 1, N = Methods.size(); I != N; ++I) { 2216 if (!MatchTwoMethodDeclarations(Methods[0], Methods[I], MMS_strict)) { 2217 issueDiagnostic = true; 2218 break; 2219 } 2220 } 2221 } 2222 2223 // If we didn't see any strict differences, we won't see any loose 2224 // differences. In ARC, however, we also need to check for loose 2225 // mismatches, because most of them are errors. 2226 if (!strictSelectorMatch || 2227 (issueDiagnostic && getLangOpts().ObjCAutoRefCount)) 2228 for (unsigned I = 1, N = Methods.size(); I != N; ++I) { 2229 // This checks if the methods differ in type mismatch. 2230 if (!MatchTwoMethodDeclarations(Methods[0], Methods[I], MMS_loose) && 2231 !isAcceptableMethodMismatch(Methods[0], Methods[I])) { 2232 issueDiagnostic = true; 2233 if (getLangOpts().ObjCAutoRefCount) 2234 issueError = true; 2235 break; 2236 } 2237 } 2238 2239 if (issueDiagnostic) { 2240 if (issueError) 2241 Diag(R.getBegin(), diag::err_arc_multiple_method_decl) << Sel << R; 2242 else if (strictSelectorMatch) 2243 Diag(R.getBegin(), diag::warn_strict_multiple_method_decl) << Sel << R; 2244 else 2245 Diag(R.getBegin(), diag::warn_multiple_method_decl) << Sel << R; 2246 2247 Diag(Methods[0]->getLocStart(), 2248 issueError ? diag::note_possibility : diag::note_using) 2249 << Methods[0]->getSourceRange(); 2250 for (unsigned I = 1, N = Methods.size(); I != N; ++I) { 2251 Diag(Methods[I]->getLocStart(), diag::note_also_found) 2252 << Methods[I]->getSourceRange(); 2253 } 2254 } 2255 return Methods[0]; 2256} 2257 2258ObjCMethodDecl *Sema::LookupImplementedMethodInGlobalPool(Selector Sel) { 2259 GlobalMethodPool::iterator Pos = MethodPool.find(Sel); 2260 if (Pos == MethodPool.end()) 2261 return 0; 2262 2263 GlobalMethods &Methods = Pos->second; 2264 2265 if (Methods.first.Method && Methods.first.Method->isDefined()) 2266 return Methods.first.Method; 2267 if (Methods.second.Method && Methods.second.Method->isDefined()) 2268 return Methods.second.Method; 2269 return 0; 2270} 2271 2272/// DiagnoseDuplicateIvars - 2273/// Check for duplicate ivars in the entire class at the start of 2274/// \@implementation. This becomes necesssary because class extension can 2275/// add ivars to a class in random order which will not be known until 2276/// class's \@implementation is seen. 2277void Sema::DiagnoseDuplicateIvars(ObjCInterfaceDecl *ID, 2278 ObjCInterfaceDecl *SID) { 2279 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 2280 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 2281 ObjCIvarDecl* Ivar = *IVI; 2282 if (Ivar->isInvalidDecl()) 2283 continue; 2284 if (IdentifierInfo *II = Ivar->getIdentifier()) { 2285 ObjCIvarDecl* prevIvar = SID->lookupInstanceVariable(II); 2286 if (prevIvar) { 2287 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 2288 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 2289 Ivar->setInvalidDecl(); 2290 } 2291 } 2292 } 2293} 2294 2295Sema::ObjCContainerKind Sema::getObjCContainerKind() const { 2296 switch (CurContext->getDeclKind()) { 2297 case Decl::ObjCInterface: 2298 return Sema::OCK_Interface; 2299 case Decl::ObjCProtocol: 2300 return Sema::OCK_Protocol; 2301 case Decl::ObjCCategory: 2302 if (dyn_cast<ObjCCategoryDecl>(CurContext)->IsClassExtension()) 2303 return Sema::OCK_ClassExtension; 2304 else 2305 return Sema::OCK_Category; 2306 case Decl::ObjCImplementation: 2307 return Sema::OCK_Implementation; 2308 case Decl::ObjCCategoryImpl: 2309 return Sema::OCK_CategoryImplementation; 2310 2311 default: 2312 return Sema::OCK_None; 2313 } 2314} 2315 2316// Note: For class/category implemenations, allMethods/allProperties is 2317// always null. 2318Decl *Sema::ActOnAtEnd(Scope *S, SourceRange AtEnd, 2319 Decl **allMethods, unsigned allNum, 2320 Decl **allProperties, unsigned pNum, 2321 DeclGroupPtrTy *allTUVars, unsigned tuvNum) { 2322 2323 if (getObjCContainerKind() == Sema::OCK_None) 2324 return 0; 2325 2326 assert(AtEnd.isValid() && "Invalid location for '@end'"); 2327 2328 ObjCContainerDecl *OCD = dyn_cast<ObjCContainerDecl>(CurContext); 2329 Decl *ClassDecl = cast<Decl>(OCD); 2330 2331 bool isInterfaceDeclKind = 2332 isa<ObjCInterfaceDecl>(ClassDecl) || isa<ObjCCategoryDecl>(ClassDecl) 2333 || isa<ObjCProtocolDecl>(ClassDecl); 2334 bool checkIdenticalMethods = isa<ObjCImplementationDecl>(ClassDecl); 2335 2336 // FIXME: Remove these and use the ObjCContainerDecl/DeclContext. 2337 llvm::DenseMap<Selector, const ObjCMethodDecl*> InsMap; 2338 llvm::DenseMap<Selector, const ObjCMethodDecl*> ClsMap; 2339 2340 for (unsigned i = 0; i < allNum; i++ ) { 2341 ObjCMethodDecl *Method = 2342 cast_or_null<ObjCMethodDecl>(allMethods[i]); 2343 2344 if (!Method) continue; // Already issued a diagnostic. 2345 if (Method->isInstanceMethod()) { 2346 /// Check for instance method of the same name with incompatible types 2347 const ObjCMethodDecl *&PrevMethod = InsMap[Method->getSelector()]; 2348 bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod) 2349 : false; 2350 if ((isInterfaceDeclKind && PrevMethod && !match) 2351 || (checkIdenticalMethods && match)) { 2352 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 2353 << Method->getDeclName(); 2354 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 2355 Method->setInvalidDecl(); 2356 } else { 2357 if (PrevMethod) { 2358 Method->setAsRedeclaration(PrevMethod); 2359 if (!Context.getSourceManager().isInSystemHeader( 2360 Method->getLocation())) 2361 Diag(Method->getLocation(), diag::warn_duplicate_method_decl) 2362 << Method->getDeclName(); 2363 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 2364 } 2365 InsMap[Method->getSelector()] = Method; 2366 /// The following allows us to typecheck messages to "id". 2367 AddInstanceMethodToGlobalPool(Method); 2368 } 2369 } else { 2370 /// Check for class method of the same name with incompatible types 2371 const ObjCMethodDecl *&PrevMethod = ClsMap[Method->getSelector()]; 2372 bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod) 2373 : false; 2374 if ((isInterfaceDeclKind && PrevMethod && !match) 2375 || (checkIdenticalMethods && match)) { 2376 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 2377 << Method->getDeclName(); 2378 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 2379 Method->setInvalidDecl(); 2380 } else { 2381 if (PrevMethod) { 2382 Method->setAsRedeclaration(PrevMethod); 2383 if (!Context.getSourceManager().isInSystemHeader( 2384 Method->getLocation())) 2385 Diag(Method->getLocation(), diag::warn_duplicate_method_decl) 2386 << Method->getDeclName(); 2387 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 2388 } 2389 ClsMap[Method->getSelector()] = Method; 2390 AddFactoryMethodToGlobalPool(Method); 2391 } 2392 } 2393 } 2394 if (isa<ObjCInterfaceDecl>(ClassDecl)) { 2395 // Nothing to do here. 2396 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(ClassDecl)) { 2397 // Categories are used to extend the class by declaring new methods. 2398 // By the same token, they are also used to add new properties. No 2399 // need to compare the added property to those in the class. 2400 2401 if (C->IsClassExtension()) { 2402 ObjCInterfaceDecl *CCPrimary = C->getClassInterface(); 2403 DiagnoseClassExtensionDupMethods(C, CCPrimary); 2404 } 2405 } 2406 if (ObjCContainerDecl *CDecl = dyn_cast<ObjCContainerDecl>(ClassDecl)) { 2407 if (CDecl->getIdentifier()) 2408 // ProcessPropertyDecl is responsible for diagnosing conflicts with any 2409 // user-defined setter/getter. It also synthesizes setter/getter methods 2410 // and adds them to the DeclContext and global method pools. 2411 for (ObjCContainerDecl::prop_iterator I = CDecl->prop_begin(), 2412 E = CDecl->prop_end(); 2413 I != E; ++I) 2414 ProcessPropertyDecl(*I, CDecl); 2415 CDecl->setAtEndRange(AtEnd); 2416 } 2417 if (ObjCImplementationDecl *IC=dyn_cast<ObjCImplementationDecl>(ClassDecl)) { 2418 IC->setAtEndRange(AtEnd); 2419 if (ObjCInterfaceDecl* IDecl = IC->getClassInterface()) { 2420 // Any property declared in a class extension might have user 2421 // declared setter or getter in current class extension or one 2422 // of the other class extensions. Mark them as synthesized as 2423 // property will be synthesized when property with same name is 2424 // seen in the @implementation. 2425 for (ObjCInterfaceDecl::visible_extensions_iterator 2426 Ext = IDecl->visible_extensions_begin(), 2427 ExtEnd = IDecl->visible_extensions_end(); 2428 Ext != ExtEnd; ++Ext) { 2429 for (ObjCContainerDecl::prop_iterator I = Ext->prop_begin(), 2430 E = Ext->prop_end(); I != E; ++I) { 2431 ObjCPropertyDecl *Property = *I; 2432 // Skip over properties declared @dynamic 2433 if (const ObjCPropertyImplDecl *PIDecl 2434 = IC->FindPropertyImplDecl(Property->getIdentifier())) 2435 if (PIDecl->getPropertyImplementation() 2436 == ObjCPropertyImplDecl::Dynamic) 2437 continue; 2438 2439 for (ObjCInterfaceDecl::visible_extensions_iterator 2440 Ext = IDecl->visible_extensions_begin(), 2441 ExtEnd = IDecl->visible_extensions_end(); 2442 Ext != ExtEnd; ++Ext) { 2443 if (ObjCMethodDecl *GetterMethod 2444 = Ext->getInstanceMethod(Property->getGetterName())) 2445 GetterMethod->setPropertyAccessor(true); 2446 if (!Property->isReadOnly()) 2447 if (ObjCMethodDecl *SetterMethod 2448 = Ext->getInstanceMethod(Property->getSetterName())) 2449 SetterMethod->setPropertyAccessor(true); 2450 } 2451 } 2452 } 2453 ImplMethodsVsClassMethods(S, IC, IDecl); 2454 AtomicPropertySetterGetterRules(IC, IDecl); 2455 DiagnoseOwningPropertyGetterSynthesis(IC); 2456 2457 bool HasRootClassAttr = IDecl->hasAttr<ObjCRootClassAttr>(); 2458 if (IDecl->getSuperClass() == NULL) { 2459 // This class has no superclass, so check that it has been marked with 2460 // __attribute((objc_root_class)). 2461 if (!HasRootClassAttr) { 2462 SourceLocation DeclLoc(IDecl->getLocation()); 2463 SourceLocation SuperClassLoc(PP.getLocForEndOfToken(DeclLoc)); 2464 Diag(DeclLoc, diag::warn_objc_root_class_missing) 2465 << IDecl->getIdentifier(); 2466 // See if NSObject is in the current scope, and if it is, suggest 2467 // adding " : NSObject " to the class declaration. 2468 NamedDecl *IF = LookupSingleName(TUScope, 2469 NSAPIObj->getNSClassId(NSAPI::ClassId_NSObject), 2470 DeclLoc, LookupOrdinaryName); 2471 ObjCInterfaceDecl *NSObjectDecl = dyn_cast_or_null<ObjCInterfaceDecl>(IF); 2472 if (NSObjectDecl && NSObjectDecl->getDefinition()) { 2473 Diag(SuperClassLoc, diag::note_objc_needs_superclass) 2474 << FixItHint::CreateInsertion(SuperClassLoc, " : NSObject "); 2475 } else { 2476 Diag(SuperClassLoc, diag::note_objc_needs_superclass); 2477 } 2478 } 2479 } else if (HasRootClassAttr) { 2480 // Complain that only root classes may have this attribute. 2481 Diag(IDecl->getLocation(), diag::err_objc_root_class_subclass); 2482 } 2483 2484 if (LangOpts.ObjCRuntime.isNonFragile()) { 2485 while (IDecl->getSuperClass()) { 2486 DiagnoseDuplicateIvars(IDecl, IDecl->getSuperClass()); 2487 IDecl = IDecl->getSuperClass(); 2488 } 2489 } 2490 } 2491 SetIvarInitializers(IC); 2492 } else if (ObjCCategoryImplDecl* CatImplClass = 2493 dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) { 2494 CatImplClass->setAtEndRange(AtEnd); 2495 2496 // Find category interface decl and then check that all methods declared 2497 // in this interface are implemented in the category @implementation. 2498 if (ObjCInterfaceDecl* IDecl = CatImplClass->getClassInterface()) { 2499 if (ObjCCategoryDecl *Cat 2500 = IDecl->FindCategoryDeclaration(CatImplClass->getIdentifier())) { 2501 ImplMethodsVsClassMethods(S, CatImplClass, Cat); 2502 } 2503 } 2504 } 2505 if (isInterfaceDeclKind) { 2506 // Reject invalid vardecls. 2507 for (unsigned i = 0; i != tuvNum; i++) { 2508 DeclGroupRef DG = allTUVars[i].getAsVal<DeclGroupRef>(); 2509 for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I) 2510 if (VarDecl *VDecl = dyn_cast<VarDecl>(*I)) { 2511 if (!VDecl->hasExternalStorage()) 2512 Diag(VDecl->getLocation(), diag::err_objc_var_decl_inclass); 2513 } 2514 } 2515 } 2516 ActOnObjCContainerFinishDefinition(); 2517 2518 for (unsigned i = 0; i != tuvNum; i++) { 2519 DeclGroupRef DG = allTUVars[i].getAsVal<DeclGroupRef>(); 2520 for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I) 2521 (*I)->setTopLevelDeclInObjCContainer(); 2522 Consumer.HandleTopLevelDeclInObjCContainer(DG); 2523 } 2524 2525 ActOnDocumentableDecl(ClassDecl); 2526 return ClassDecl; 2527} 2528 2529 2530/// CvtQTToAstBitMask - utility routine to produce an AST bitmask for 2531/// objective-c's type qualifier from the parser version of the same info. 2532static Decl::ObjCDeclQualifier 2533CvtQTToAstBitMask(ObjCDeclSpec::ObjCDeclQualifier PQTVal) { 2534 return (Decl::ObjCDeclQualifier) (unsigned) PQTVal; 2535} 2536 2537static inline 2538unsigned countAlignAttr(const AttrVec &A) { 2539 unsigned count=0; 2540 for (AttrVec::const_iterator i = A.begin(), e = A.end(); i != e; ++i) 2541 if ((*i)->getKind() == attr::Aligned) 2542 ++count; 2543 return count; 2544} 2545 2546static inline 2547bool containsInvalidMethodImplAttribute(ObjCMethodDecl *IMD, 2548 const AttrVec &A) { 2549 // If method is only declared in implementation (private method), 2550 // No need to issue any diagnostics on method definition with attributes. 2551 if (!IMD) 2552 return false; 2553 2554 // method declared in interface has no attribute. 2555 // But implementation has attributes. This is invalid. 2556 // Except when implementation has 'Align' attribute which is 2557 // immaterial to method declared in interface. 2558 if (!IMD->hasAttrs()) 2559 return (A.size() > countAlignAttr(A)); 2560 2561 const AttrVec &D = IMD->getAttrs(); 2562 2563 unsigned countAlignOnImpl = countAlignAttr(A); 2564 if (!countAlignOnImpl && (A.size() != D.size())) 2565 return true; 2566 else if (countAlignOnImpl) { 2567 unsigned countAlignOnDecl = countAlignAttr(D); 2568 if (countAlignOnDecl && (A.size() != D.size())) 2569 return true; 2570 else if (!countAlignOnDecl && 2571 ((A.size()-countAlignOnImpl) != D.size())) 2572 return true; 2573 } 2574 2575 // attributes on method declaration and definition must match exactly. 2576 // Note that we have at most a couple of attributes on methods, so this 2577 // n*n search is good enough. 2578 for (AttrVec::const_iterator i = A.begin(), e = A.end(); i != e; ++i) { 2579 if ((*i)->getKind() == attr::Aligned) 2580 continue; 2581 bool match = false; 2582 for (AttrVec::const_iterator i1 = D.begin(), e1 = D.end(); i1 != e1; ++i1) { 2583 if ((*i)->getKind() == (*i1)->getKind()) { 2584 match = true; 2585 break; 2586 } 2587 } 2588 if (!match) 2589 return true; 2590 } 2591 2592 return false; 2593} 2594 2595/// \brief Check whether the declared result type of the given Objective-C 2596/// method declaration is compatible with the method's class. 2597/// 2598static Sema::ResultTypeCompatibilityKind 2599CheckRelatedResultTypeCompatibility(Sema &S, ObjCMethodDecl *Method, 2600 ObjCInterfaceDecl *CurrentClass) { 2601 QualType ResultType = Method->getResultType(); 2602 2603 // If an Objective-C method inherits its related result type, then its 2604 // declared result type must be compatible with its own class type. The 2605 // declared result type is compatible if: 2606 if (const ObjCObjectPointerType *ResultObjectType 2607 = ResultType->getAs<ObjCObjectPointerType>()) { 2608 // - it is id or qualified id, or 2609 if (ResultObjectType->isObjCIdType() || 2610 ResultObjectType->isObjCQualifiedIdType()) 2611 return Sema::RTC_Compatible; 2612 2613 if (CurrentClass) { 2614 if (ObjCInterfaceDecl *ResultClass 2615 = ResultObjectType->getInterfaceDecl()) { 2616 // - it is the same as the method's class type, or 2617 if (declaresSameEntity(CurrentClass, ResultClass)) 2618 return Sema::RTC_Compatible; 2619 2620 // - it is a superclass of the method's class type 2621 if (ResultClass->isSuperClassOf(CurrentClass)) 2622 return Sema::RTC_Compatible; 2623 } 2624 } else { 2625 // Any Objective-C pointer type might be acceptable for a protocol 2626 // method; we just don't know. 2627 return Sema::RTC_Unknown; 2628 } 2629 } 2630 2631 return Sema::RTC_Incompatible; 2632} 2633 2634namespace { 2635/// A helper class for searching for methods which a particular method 2636/// overrides. 2637class OverrideSearch { 2638public: 2639 Sema &S; 2640 ObjCMethodDecl *Method; 2641 llvm::SmallPtrSet<ObjCMethodDecl*, 4> Overridden; 2642 bool Recursive; 2643 2644public: 2645 OverrideSearch(Sema &S, ObjCMethodDecl *method) : S(S), Method(method) { 2646 Selector selector = method->getSelector(); 2647 2648 // Bypass this search if we've never seen an instance/class method 2649 // with this selector before. 2650 Sema::GlobalMethodPool::iterator it = S.MethodPool.find(selector); 2651 if (it == S.MethodPool.end()) { 2652 if (!S.getExternalSource()) return; 2653 S.ReadMethodPool(selector); 2654 2655 it = S.MethodPool.find(selector); 2656 if (it == S.MethodPool.end()) 2657 return; 2658 } 2659 ObjCMethodList &list = 2660 method->isInstanceMethod() ? it->second.first : it->second.second; 2661 if (!list.Method) return; 2662 2663 ObjCContainerDecl *container 2664 = cast<ObjCContainerDecl>(method->getDeclContext()); 2665 2666 // Prevent the search from reaching this container again. This is 2667 // important with categories, which override methods from the 2668 // interface and each other. 2669 if (ObjCCategoryDecl *Category = dyn_cast<ObjCCategoryDecl>(container)) { 2670 searchFromContainer(container); 2671 if (ObjCInterfaceDecl *Interface = Category->getClassInterface()) 2672 searchFromContainer(Interface); 2673 } else { 2674 searchFromContainer(container); 2675 } 2676 } 2677 2678 typedef llvm::SmallPtrSet<ObjCMethodDecl*, 128>::iterator iterator; 2679 iterator begin() const { return Overridden.begin(); } 2680 iterator end() const { return Overridden.end(); } 2681 2682private: 2683 void searchFromContainer(ObjCContainerDecl *container) { 2684 if (container->isInvalidDecl()) return; 2685 2686 switch (container->getDeclKind()) { 2687#define OBJCCONTAINER(type, base) \ 2688 case Decl::type: \ 2689 searchFrom(cast<type##Decl>(container)); \ 2690 break; 2691#define ABSTRACT_DECL(expansion) 2692#define DECL(type, base) \ 2693 case Decl::type: 2694#include "clang/AST/DeclNodes.inc" 2695 llvm_unreachable("not an ObjC container!"); 2696 } 2697 } 2698 2699 void searchFrom(ObjCProtocolDecl *protocol) { 2700 if (!protocol->hasDefinition()) 2701 return; 2702 2703 // A method in a protocol declaration overrides declarations from 2704 // referenced ("parent") protocols. 2705 search(protocol->getReferencedProtocols()); 2706 } 2707 2708 void searchFrom(ObjCCategoryDecl *category) { 2709 // A method in a category declaration overrides declarations from 2710 // the main class and from protocols the category references. 2711 // The main class is handled in the constructor. 2712 search(category->getReferencedProtocols()); 2713 } 2714 2715 void searchFrom(ObjCCategoryImplDecl *impl) { 2716 // A method in a category definition that has a category 2717 // declaration overrides declarations from the category 2718 // declaration. 2719 if (ObjCCategoryDecl *category = impl->getCategoryDecl()) { 2720 search(category); 2721 if (ObjCInterfaceDecl *Interface = category->getClassInterface()) 2722 search(Interface); 2723 2724 // Otherwise it overrides declarations from the class. 2725 } else if (ObjCInterfaceDecl *Interface = impl->getClassInterface()) { 2726 search(Interface); 2727 } 2728 } 2729 2730 void searchFrom(ObjCInterfaceDecl *iface) { 2731 // A method in a class declaration overrides declarations from 2732 if (!iface->hasDefinition()) 2733 return; 2734 2735 // - categories, 2736 for (ObjCInterfaceDecl::known_categories_iterator 2737 cat = iface->known_categories_begin(), 2738 catEnd = iface->known_categories_end(); 2739 cat != catEnd; ++cat) { 2740 search(*cat); 2741 } 2742 2743 // - the super class, and 2744 if (ObjCInterfaceDecl *super = iface->getSuperClass()) 2745 search(super); 2746 2747 // - any referenced protocols. 2748 search(iface->getReferencedProtocols()); 2749 } 2750 2751 void searchFrom(ObjCImplementationDecl *impl) { 2752 // A method in a class implementation overrides declarations from 2753 // the class interface. 2754 if (ObjCInterfaceDecl *Interface = impl->getClassInterface()) 2755 search(Interface); 2756 } 2757 2758 2759 void search(const ObjCProtocolList &protocols) { 2760 for (ObjCProtocolList::iterator i = protocols.begin(), e = protocols.end(); 2761 i != e; ++i) 2762 search(*i); 2763 } 2764 2765 void search(ObjCContainerDecl *container) { 2766 // Check for a method in this container which matches this selector. 2767 ObjCMethodDecl *meth = container->getMethod(Method->getSelector(), 2768 Method->isInstanceMethod(), 2769 /*AllowHidden=*/true); 2770 2771 // If we find one, record it and bail out. 2772 if (meth) { 2773 Overridden.insert(meth); 2774 return; 2775 } 2776 2777 // Otherwise, search for methods that a hypothetical method here 2778 // would have overridden. 2779 2780 // Note that we're now in a recursive case. 2781 Recursive = true; 2782 2783 searchFromContainer(container); 2784 } 2785}; 2786} 2787 2788void Sema::CheckObjCMethodOverrides(ObjCMethodDecl *ObjCMethod, 2789 ObjCInterfaceDecl *CurrentClass, 2790 ResultTypeCompatibilityKind RTC) { 2791 // Search for overridden methods and merge information down from them. 2792 OverrideSearch overrides(*this, ObjCMethod); 2793 // Keep track if the method overrides any method in the class's base classes, 2794 // its protocols, or its categories' protocols; we will keep that info 2795 // in the ObjCMethodDecl. 2796 // For this info, a method in an implementation is not considered as 2797 // overriding the same method in the interface or its categories. 2798 bool hasOverriddenMethodsInBaseOrProtocol = false; 2799 for (OverrideSearch::iterator 2800 i = overrides.begin(), e = overrides.end(); i != e; ++i) { 2801 ObjCMethodDecl *overridden = *i; 2802 2803 if (isa<ObjCProtocolDecl>(overridden->getDeclContext()) || 2804 CurrentClass != overridden->getClassInterface() || 2805 overridden->isOverriding()) 2806 hasOverriddenMethodsInBaseOrProtocol = true; 2807 2808 // Propagate down the 'related result type' bit from overridden methods. 2809 if (RTC != Sema::RTC_Incompatible && overridden->hasRelatedResultType()) 2810 ObjCMethod->SetRelatedResultType(); 2811 2812 // Then merge the declarations. 2813 mergeObjCMethodDecls(ObjCMethod, overridden); 2814 2815 if (ObjCMethod->isImplicit() && overridden->isImplicit()) 2816 continue; // Conflicting properties are detected elsewhere. 2817 2818 // Check for overriding methods 2819 if (isa<ObjCInterfaceDecl>(ObjCMethod->getDeclContext()) || 2820 isa<ObjCImplementationDecl>(ObjCMethod->getDeclContext())) 2821 CheckConflictingOverridingMethod(ObjCMethod, overridden, 2822 isa<ObjCProtocolDecl>(overridden->getDeclContext())); 2823 2824 if (CurrentClass && overridden->getDeclContext() != CurrentClass && 2825 isa<ObjCInterfaceDecl>(overridden->getDeclContext()) && 2826 !overridden->isImplicit() /* not meant for properties */) { 2827 ObjCMethodDecl::param_iterator ParamI = ObjCMethod->param_begin(), 2828 E = ObjCMethod->param_end(); 2829 ObjCMethodDecl::param_iterator PrevI = overridden->param_begin(), 2830 PrevE = overridden->param_end(); 2831 for (; ParamI != E && PrevI != PrevE; ++ParamI, ++PrevI) { 2832 assert(PrevI != overridden->param_end() && "Param mismatch"); 2833 QualType T1 = Context.getCanonicalType((*ParamI)->getType()); 2834 QualType T2 = Context.getCanonicalType((*PrevI)->getType()); 2835 // If type of argument of method in this class does not match its 2836 // respective argument type in the super class method, issue warning; 2837 if (!Context.typesAreCompatible(T1, T2)) { 2838 Diag((*ParamI)->getLocation(), diag::ext_typecheck_base_super) 2839 << T1 << T2; 2840 Diag(overridden->getLocation(), diag::note_previous_declaration); 2841 break; 2842 } 2843 } 2844 } 2845 } 2846 2847 ObjCMethod->setOverriding(hasOverriddenMethodsInBaseOrProtocol); 2848} 2849 2850Decl *Sema::ActOnMethodDeclaration( 2851 Scope *S, 2852 SourceLocation MethodLoc, SourceLocation EndLoc, 2853 tok::TokenKind MethodType, 2854 ObjCDeclSpec &ReturnQT, ParsedType ReturnType, 2855 ArrayRef<SourceLocation> SelectorLocs, 2856 Selector Sel, 2857 // optional arguments. The number of types/arguments is obtained 2858 // from the Sel.getNumArgs(). 2859 ObjCArgInfo *ArgInfo, 2860 DeclaratorChunk::ParamInfo *CParamInfo, unsigned CNumArgs, // c-style args 2861 AttributeList *AttrList, tok::ObjCKeywordKind MethodDeclKind, 2862 bool isVariadic, bool MethodDefinition) { 2863 // Make sure we can establish a context for the method. 2864 if (!CurContext->isObjCContainer()) { 2865 Diag(MethodLoc, diag::error_missing_method_context); 2866 return 0; 2867 } 2868 ObjCContainerDecl *OCD = dyn_cast<ObjCContainerDecl>(CurContext); 2869 Decl *ClassDecl = cast<Decl>(OCD); 2870 QualType resultDeclType; 2871 2872 bool HasRelatedResultType = false; 2873 TypeSourceInfo *ResultTInfo = 0; 2874 if (ReturnType) { 2875 resultDeclType = GetTypeFromParser(ReturnType, &ResultTInfo); 2876 2877 // Methods cannot return interface types. All ObjC objects are 2878 // passed by reference. 2879 if (resultDeclType->isObjCObjectType()) { 2880 Diag(MethodLoc, diag::err_object_cannot_be_passed_returned_by_value) 2881 << 0 << resultDeclType; 2882 return 0; 2883 } 2884 2885 HasRelatedResultType = (resultDeclType == Context.getObjCInstanceType()); 2886 } else { // get the type for "id". 2887 resultDeclType = Context.getObjCIdType(); 2888 Diag(MethodLoc, diag::warn_missing_method_return_type) 2889 << FixItHint::CreateInsertion(SelectorLocs.front(), "(id)"); 2890 } 2891 2892 ObjCMethodDecl* ObjCMethod = 2893 ObjCMethodDecl::Create(Context, MethodLoc, EndLoc, Sel, 2894 resultDeclType, 2895 ResultTInfo, 2896 CurContext, 2897 MethodType == tok::minus, isVariadic, 2898 /*isPropertyAccessor=*/false, 2899 /*isImplicitlyDeclared=*/false, /*isDefined=*/false, 2900 MethodDeclKind == tok::objc_optional 2901 ? ObjCMethodDecl::Optional 2902 : ObjCMethodDecl::Required, 2903 HasRelatedResultType); 2904 2905 SmallVector<ParmVarDecl*, 16> Params; 2906 2907 for (unsigned i = 0, e = Sel.getNumArgs(); i != e; ++i) { 2908 QualType ArgType; 2909 TypeSourceInfo *DI; 2910 2911 if (ArgInfo[i].Type == 0) { 2912 ArgType = Context.getObjCIdType(); 2913 DI = 0; 2914 } else { 2915 ArgType = GetTypeFromParser(ArgInfo[i].Type, &DI); 2916 } 2917 2918 LookupResult R(*this, ArgInfo[i].Name, ArgInfo[i].NameLoc, 2919 LookupOrdinaryName, ForRedeclaration); 2920 LookupName(R, S); 2921 if (R.isSingleResult()) { 2922 NamedDecl *PrevDecl = R.getFoundDecl(); 2923 if (S->isDeclScope(PrevDecl)) { 2924 Diag(ArgInfo[i].NameLoc, 2925 (MethodDefinition ? diag::warn_method_param_redefinition 2926 : diag::warn_method_param_declaration)) 2927 << ArgInfo[i].Name; 2928 Diag(PrevDecl->getLocation(), 2929 diag::note_previous_declaration); 2930 } 2931 } 2932 2933 SourceLocation StartLoc = DI 2934 ? DI->getTypeLoc().getBeginLoc() 2935 : ArgInfo[i].NameLoc; 2936 2937 ParmVarDecl* Param = CheckParameter(ObjCMethod, StartLoc, 2938 ArgInfo[i].NameLoc, ArgInfo[i].Name, 2939 ArgType, DI, SC_None); 2940 2941 Param->setObjCMethodScopeInfo(i); 2942 2943 Param->setObjCDeclQualifier( 2944 CvtQTToAstBitMask(ArgInfo[i].DeclSpec.getObjCDeclQualifier())); 2945 2946 // Apply the attributes to the parameter. 2947 ProcessDeclAttributeList(TUScope, Param, ArgInfo[i].ArgAttrs); 2948 2949 if (Param->hasAttr<BlocksAttr>()) { 2950 Diag(Param->getLocation(), diag::err_block_on_nonlocal); 2951 Param->setInvalidDecl(); 2952 } 2953 S->AddDecl(Param); 2954 IdResolver.AddDecl(Param); 2955 2956 Params.push_back(Param); 2957 } 2958 2959 for (unsigned i = 0, e = CNumArgs; i != e; ++i) { 2960 ParmVarDecl *Param = cast<ParmVarDecl>(CParamInfo[i].Param); 2961 QualType ArgType = Param->getType(); 2962 if (ArgType.isNull()) 2963 ArgType = Context.getObjCIdType(); 2964 else 2965 // Perform the default array/function conversions (C99 6.7.5.3p[7,8]). 2966 ArgType = Context.getAdjustedParameterType(ArgType); 2967 if (ArgType->isObjCObjectType()) { 2968 Diag(Param->getLocation(), 2969 diag::err_object_cannot_be_passed_returned_by_value) 2970 << 1 << ArgType; 2971 Param->setInvalidDecl(); 2972 } 2973 Param->setDeclContext(ObjCMethod); 2974 2975 Params.push_back(Param); 2976 } 2977 2978 ObjCMethod->setMethodParams(Context, Params, SelectorLocs); 2979 ObjCMethod->setObjCDeclQualifier( 2980 CvtQTToAstBitMask(ReturnQT.getObjCDeclQualifier())); 2981 2982 if (AttrList) 2983 ProcessDeclAttributeList(TUScope, ObjCMethod, AttrList); 2984 2985 // Add the method now. 2986 const ObjCMethodDecl *PrevMethod = 0; 2987 if (ObjCImplDecl *ImpDecl = dyn_cast<ObjCImplDecl>(ClassDecl)) { 2988 if (MethodType == tok::minus) { 2989 PrevMethod = ImpDecl->getInstanceMethod(Sel); 2990 ImpDecl->addInstanceMethod(ObjCMethod); 2991 } else { 2992 PrevMethod = ImpDecl->getClassMethod(Sel); 2993 ImpDecl->addClassMethod(ObjCMethod); 2994 } 2995 2996 ObjCMethodDecl *IMD = 0; 2997 if (ObjCInterfaceDecl *IDecl = ImpDecl->getClassInterface()) 2998 IMD = IDecl->lookupMethod(ObjCMethod->getSelector(), 2999 ObjCMethod->isInstanceMethod()); 3000 if (ObjCMethod->hasAttrs() && 3001 containsInvalidMethodImplAttribute(IMD, ObjCMethod->getAttrs())) { 3002 SourceLocation MethodLoc = IMD->getLocation(); 3003 if (!getSourceManager().isInSystemHeader(MethodLoc)) { 3004 Diag(EndLoc, diag::warn_attribute_method_def); 3005 Diag(MethodLoc, diag::note_method_declared_at) 3006 << ObjCMethod->getDeclName(); 3007 } 3008 } 3009 } else { 3010 cast<DeclContext>(ClassDecl)->addDecl(ObjCMethod); 3011 } 3012 3013 if (PrevMethod) { 3014 // You can never have two method definitions with the same name. 3015 Diag(ObjCMethod->getLocation(), diag::err_duplicate_method_decl) 3016 << ObjCMethod->getDeclName(); 3017 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 3018 } 3019 3020 // If this Objective-C method does not have a related result type, but we 3021 // are allowed to infer related result types, try to do so based on the 3022 // method family. 3023 ObjCInterfaceDecl *CurrentClass = dyn_cast<ObjCInterfaceDecl>(ClassDecl); 3024 if (!CurrentClass) { 3025 if (ObjCCategoryDecl *Cat = dyn_cast<ObjCCategoryDecl>(ClassDecl)) 3026 CurrentClass = Cat->getClassInterface(); 3027 else if (ObjCImplDecl *Impl = dyn_cast<ObjCImplDecl>(ClassDecl)) 3028 CurrentClass = Impl->getClassInterface(); 3029 else if (ObjCCategoryImplDecl *CatImpl 3030 = dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) 3031 CurrentClass = CatImpl->getClassInterface(); 3032 } 3033 3034 ResultTypeCompatibilityKind RTC 3035 = CheckRelatedResultTypeCompatibility(*this, ObjCMethod, CurrentClass); 3036 3037 CheckObjCMethodOverrides(ObjCMethod, CurrentClass, RTC); 3038 3039 bool ARCError = false; 3040 if (getLangOpts().ObjCAutoRefCount) 3041 ARCError = CheckARCMethodDecl(ObjCMethod); 3042 3043 // Infer the related result type when possible. 3044 if (!ARCError && RTC == Sema::RTC_Compatible && 3045 !ObjCMethod->hasRelatedResultType() && 3046 LangOpts.ObjCInferRelatedResultType) { 3047 bool InferRelatedResultType = false; 3048 switch (ObjCMethod->getMethodFamily()) { 3049 case OMF_None: 3050 case OMF_copy: 3051 case OMF_dealloc: 3052 case OMF_finalize: 3053 case OMF_mutableCopy: 3054 case OMF_release: 3055 case OMF_retainCount: 3056 case OMF_performSelector: 3057 break; 3058 3059 case OMF_alloc: 3060 case OMF_new: 3061 InferRelatedResultType = ObjCMethod->isClassMethod(); 3062 break; 3063 3064 case OMF_init: 3065 case OMF_autorelease: 3066 case OMF_retain: 3067 case OMF_self: 3068 InferRelatedResultType = ObjCMethod->isInstanceMethod(); 3069 break; 3070 } 3071 3072 if (InferRelatedResultType) 3073 ObjCMethod->SetRelatedResultType(); 3074 } 3075 3076 ActOnDocumentableDecl(ObjCMethod); 3077 3078 return ObjCMethod; 3079} 3080 3081bool Sema::CheckObjCDeclScope(Decl *D) { 3082 // Following is also an error. But it is caused by a missing @end 3083 // and diagnostic is issued elsewhere. 3084 if (isa<ObjCContainerDecl>(CurContext->getRedeclContext())) 3085 return false; 3086 3087 // If we switched context to translation unit while we are still lexically in 3088 // an objc container, it means the parser missed emitting an error. 3089 if (isa<TranslationUnitDecl>(getCurLexicalContext()->getRedeclContext())) 3090 return false; 3091 3092 Diag(D->getLocation(), diag::err_objc_decls_may_only_appear_in_global_scope); 3093 D->setInvalidDecl(); 3094 3095 return true; 3096} 3097 3098/// Called whenever \@defs(ClassName) is encountered in the source. Inserts the 3099/// instance variables of ClassName into Decls. 3100void Sema::ActOnDefs(Scope *S, Decl *TagD, SourceLocation DeclStart, 3101 IdentifierInfo *ClassName, 3102 SmallVectorImpl<Decl*> &Decls) { 3103 // Check that ClassName is a valid class 3104 ObjCInterfaceDecl *Class = getObjCInterfaceDecl(ClassName, DeclStart); 3105 if (!Class) { 3106 Diag(DeclStart, diag::err_undef_interface) << ClassName; 3107 return; 3108 } 3109 if (LangOpts.ObjCRuntime.isNonFragile()) { 3110 Diag(DeclStart, diag::err_atdef_nonfragile_interface); 3111 return; 3112 } 3113 3114 // Collect the instance variables 3115 SmallVector<const ObjCIvarDecl*, 32> Ivars; 3116 Context.DeepCollectObjCIvars(Class, true, Ivars); 3117 // For each ivar, create a fresh ObjCAtDefsFieldDecl. 3118 for (unsigned i = 0; i < Ivars.size(); i++) { 3119 const FieldDecl* ID = cast<FieldDecl>(Ivars[i]); 3120 RecordDecl *Record = dyn_cast<RecordDecl>(TagD); 3121 Decl *FD = ObjCAtDefsFieldDecl::Create(Context, Record, 3122 /*FIXME: StartL=*/ID->getLocation(), 3123 ID->getLocation(), 3124 ID->getIdentifier(), ID->getType(), 3125 ID->getBitWidth()); 3126 Decls.push_back(FD); 3127 } 3128 3129 // Introduce all of these fields into the appropriate scope. 3130 for (SmallVectorImpl<Decl*>::iterator D = Decls.begin(); 3131 D != Decls.end(); ++D) { 3132 FieldDecl *FD = cast<FieldDecl>(*D); 3133 if (getLangOpts().CPlusPlus) 3134 PushOnScopeChains(cast<FieldDecl>(FD), S); 3135 else if (RecordDecl *Record = dyn_cast<RecordDecl>(TagD)) 3136 Record->addDecl(FD); 3137 } 3138} 3139 3140/// \brief Build a type-check a new Objective-C exception variable declaration. 3141VarDecl *Sema::BuildObjCExceptionDecl(TypeSourceInfo *TInfo, QualType T, 3142 SourceLocation StartLoc, 3143 SourceLocation IdLoc, 3144 IdentifierInfo *Id, 3145 bool Invalid) { 3146 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 3147 // duration shall not be qualified by an address-space qualifier." 3148 // Since all parameters have automatic store duration, they can not have 3149 // an address space. 3150 if (T.getAddressSpace() != 0) { 3151 Diag(IdLoc, diag::err_arg_with_address_space); 3152 Invalid = true; 3153 } 3154 3155 // An @catch parameter must be an unqualified object pointer type; 3156 // FIXME: Recover from "NSObject foo" by inserting the * in "NSObject *foo"? 3157 if (Invalid) { 3158 // Don't do any further checking. 3159 } else if (T->isDependentType()) { 3160 // Okay: we don't know what this type will instantiate to. 3161 } else if (!T->isObjCObjectPointerType()) { 3162 Invalid = true; 3163 Diag(IdLoc ,diag::err_catch_param_not_objc_type); 3164 } else if (T->isObjCQualifiedIdType()) { 3165 Invalid = true; 3166 Diag(IdLoc, diag::err_illegal_qualifiers_on_catch_parm); 3167 } 3168 3169 VarDecl *New = VarDecl::Create(Context, CurContext, StartLoc, IdLoc, Id, 3170 T, TInfo, SC_None); 3171 New->setExceptionVariable(true); 3172 3173 // In ARC, infer 'retaining' for variables of retainable type. 3174 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(New)) 3175 Invalid = true; 3176 3177 if (Invalid) 3178 New->setInvalidDecl(); 3179 return New; 3180} 3181 3182Decl *Sema::ActOnObjCExceptionDecl(Scope *S, Declarator &D) { 3183 const DeclSpec &DS = D.getDeclSpec(); 3184 3185 // We allow the "register" storage class on exception variables because 3186 // GCC did, but we drop it completely. Any other storage class is an error. 3187 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 3188 Diag(DS.getStorageClassSpecLoc(), diag::warn_register_objc_catch_parm) 3189 << FixItHint::CreateRemoval(SourceRange(DS.getStorageClassSpecLoc())); 3190 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 3191 Diag(DS.getStorageClassSpecLoc(), diag::err_storage_spec_on_catch_parm) 3192 << DS.getStorageClassSpec(); 3193 } 3194 if (D.getDeclSpec().isThreadSpecified()) 3195 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3196 D.getMutableDeclSpec().ClearStorageClassSpecs(); 3197 3198 DiagnoseFunctionSpecifiers(D.getDeclSpec()); 3199 3200 // Check that there are no default arguments inside the type of this 3201 // exception object (C++ only). 3202 if (getLangOpts().CPlusPlus) 3203 CheckExtraCXXDefaultArguments(D); 3204 3205 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3206 QualType ExceptionType = TInfo->getType(); 3207 3208 VarDecl *New = BuildObjCExceptionDecl(TInfo, ExceptionType, 3209 D.getSourceRange().getBegin(), 3210 D.getIdentifierLoc(), 3211 D.getIdentifier(), 3212 D.isInvalidType()); 3213 3214 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 3215 if (D.getCXXScopeSpec().isSet()) { 3216 Diag(D.getIdentifierLoc(), diag::err_qualified_objc_catch_parm) 3217 << D.getCXXScopeSpec().getRange(); 3218 New->setInvalidDecl(); 3219 } 3220 3221 // Add the parameter declaration into this scope. 3222 S->AddDecl(New); 3223 if (D.getIdentifier()) 3224 IdResolver.AddDecl(New); 3225 3226 ProcessDeclAttributes(S, New, D); 3227 3228 if (New->hasAttr<BlocksAttr>()) 3229 Diag(New->getLocation(), diag::err_block_on_nonlocal); 3230 return New; 3231} 3232 3233/// CollectIvarsToConstructOrDestruct - Collect those ivars which require 3234/// initialization. 3235void Sema::CollectIvarsToConstructOrDestruct(ObjCInterfaceDecl *OI, 3236 SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 3237 for (ObjCIvarDecl *Iv = OI->all_declared_ivar_begin(); Iv; 3238 Iv= Iv->getNextIvar()) { 3239 QualType QT = Context.getBaseElementType(Iv->getType()); 3240 if (QT->isRecordType()) 3241 Ivars.push_back(Iv); 3242 } 3243} 3244 3245void Sema::DiagnoseUseOfUnimplementedSelectors() { 3246 // Load referenced selectors from the external source. 3247 if (ExternalSource) { 3248 SmallVector<std::pair<Selector, SourceLocation>, 4> Sels; 3249 ExternalSource->ReadReferencedSelectors(Sels); 3250 for (unsigned I = 0, N = Sels.size(); I != N; ++I) 3251 ReferencedSelectors[Sels[I].first] = Sels[I].second; 3252 } 3253 3254 // Warning will be issued only when selector table is 3255 // generated (which means there is at lease one implementation 3256 // in the TU). This is to match gcc's behavior. 3257 if (ReferencedSelectors.empty() || 3258 !Context.AnyObjCImplementation()) 3259 return; 3260 for (llvm::DenseMap<Selector, SourceLocation>::iterator S = 3261 ReferencedSelectors.begin(), 3262 E = ReferencedSelectors.end(); S != E; ++S) { 3263 Selector Sel = (*S).first; 3264 if (!LookupImplementedMethodInGlobalPool(Sel)) 3265 Diag((*S).second, diag::warn_unimplemented_selector) << Sel; 3266 } 3267 return; 3268} 3269