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 // If this is a forward protocol declaration, get its definition. 749 if (!PDecl->isThisDeclarationADefinition() && PDecl->getDefinition()) 750 PDecl = PDecl->getDefinition(); 751 752 (void)DiagnoseUseOfDecl(PDecl, ProtocolId[i].second); 753 754 // If this is a forward declaration and we are supposed to warn in this 755 // case, do it. 756 // FIXME: Recover nicely in the hidden case. 757 if (WarnOnDeclarations && 758 (!PDecl->hasDefinition() || PDecl->getDefinition()->isHidden())) 759 Diag(ProtocolId[i].second, diag::warn_undef_protocolref) 760 << ProtocolId[i].first; 761 Protocols.push_back(PDecl); 762 } 763} 764 765/// DiagnoseClassExtensionDupMethods - Check for duplicate declaration of 766/// a class method in its extension. 767/// 768void Sema::DiagnoseClassExtensionDupMethods(ObjCCategoryDecl *CAT, 769 ObjCInterfaceDecl *ID) { 770 if (!ID) 771 return; // Possibly due to previous error 772 773 llvm::DenseMap<Selector, const ObjCMethodDecl*> MethodMap; 774 for (ObjCInterfaceDecl::method_iterator i = ID->meth_begin(), 775 e = ID->meth_end(); i != e; ++i) { 776 ObjCMethodDecl *MD = *i; 777 MethodMap[MD->getSelector()] = MD; 778 } 779 780 if (MethodMap.empty()) 781 return; 782 for (ObjCCategoryDecl::method_iterator i = CAT->meth_begin(), 783 e = CAT->meth_end(); i != e; ++i) { 784 ObjCMethodDecl *Method = *i; 785 const ObjCMethodDecl *&PrevMethod = MethodMap[Method->getSelector()]; 786 if (PrevMethod && !MatchTwoMethodDeclarations(Method, PrevMethod)) { 787 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 788 << Method->getDeclName(); 789 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 790 } 791 } 792} 793 794/// ActOnForwardProtocolDeclaration - Handle \@protocol foo; 795Sema::DeclGroupPtrTy 796Sema::ActOnForwardProtocolDeclaration(SourceLocation AtProtocolLoc, 797 const IdentifierLocPair *IdentList, 798 unsigned NumElts, 799 AttributeList *attrList) { 800 SmallVector<Decl *, 8> DeclsInGroup; 801 for (unsigned i = 0; i != NumElts; ++i) { 802 IdentifierInfo *Ident = IdentList[i].first; 803 ObjCProtocolDecl *PrevDecl = LookupProtocol(Ident, IdentList[i].second, 804 ForRedeclaration); 805 ObjCProtocolDecl *PDecl 806 = ObjCProtocolDecl::Create(Context, CurContext, Ident, 807 IdentList[i].second, AtProtocolLoc, 808 PrevDecl); 809 810 PushOnScopeChains(PDecl, TUScope); 811 CheckObjCDeclScope(PDecl); 812 813 if (attrList) 814 ProcessDeclAttributeList(TUScope, PDecl, attrList); 815 816 if (PrevDecl) 817 mergeDeclAttributes(PDecl, PrevDecl); 818 819 DeclsInGroup.push_back(PDecl); 820 } 821 822 return BuildDeclaratorGroup(DeclsInGroup.data(), DeclsInGroup.size(), false); 823} 824 825Decl *Sema:: 826ActOnStartCategoryInterface(SourceLocation AtInterfaceLoc, 827 IdentifierInfo *ClassName, SourceLocation ClassLoc, 828 IdentifierInfo *CategoryName, 829 SourceLocation CategoryLoc, 830 Decl * const *ProtoRefs, 831 unsigned NumProtoRefs, 832 const SourceLocation *ProtoLocs, 833 SourceLocation EndProtoLoc) { 834 ObjCCategoryDecl *CDecl; 835 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true); 836 837 /// Check that class of this category is already completely declared. 838 839 if (!IDecl 840 || RequireCompleteType(ClassLoc, Context.getObjCInterfaceType(IDecl), 841 diag::err_category_forward_interface, 842 CategoryName == 0)) { 843 // Create an invalid ObjCCategoryDecl to serve as context for 844 // the enclosing method declarations. We mark the decl invalid 845 // to make it clear that this isn't a valid AST. 846 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc, 847 ClassLoc, CategoryLoc, CategoryName,IDecl); 848 CDecl->setInvalidDecl(); 849 CurContext->addDecl(CDecl); 850 851 if (!IDecl) 852 Diag(ClassLoc, diag::err_undef_interface) << ClassName; 853 return ActOnObjCContainerStartDefinition(CDecl); 854 } 855 856 if (!CategoryName && IDecl->getImplementation()) { 857 Diag(ClassLoc, diag::err_class_extension_after_impl) << ClassName; 858 Diag(IDecl->getImplementation()->getLocation(), 859 diag::note_implementation_declared); 860 } 861 862 if (CategoryName) { 863 /// Check for duplicate interface declaration for this category 864 if (ObjCCategoryDecl *Previous 865 = IDecl->FindCategoryDeclaration(CategoryName)) { 866 // Class extensions can be declared multiple times, categories cannot. 867 Diag(CategoryLoc, diag::warn_dup_category_def) 868 << ClassName << CategoryName; 869 Diag(Previous->getLocation(), diag::note_previous_definition); 870 } 871 } 872 873 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc, 874 ClassLoc, CategoryLoc, CategoryName, IDecl); 875 // FIXME: PushOnScopeChains? 876 CurContext->addDecl(CDecl); 877 878 if (NumProtoRefs) { 879 CDecl->setProtocolList((ObjCProtocolDecl*const*)ProtoRefs, NumProtoRefs, 880 ProtoLocs, Context); 881 // Protocols in the class extension belong to the class. 882 if (CDecl->IsClassExtension()) 883 IDecl->mergeClassExtensionProtocolList((ObjCProtocolDecl*const*)ProtoRefs, 884 NumProtoRefs, Context); 885 } 886 887 CheckObjCDeclScope(CDecl); 888 return ActOnObjCContainerStartDefinition(CDecl); 889} 890 891/// ActOnStartCategoryImplementation - Perform semantic checks on the 892/// category implementation declaration and build an ObjCCategoryImplDecl 893/// object. 894Decl *Sema::ActOnStartCategoryImplementation( 895 SourceLocation AtCatImplLoc, 896 IdentifierInfo *ClassName, SourceLocation ClassLoc, 897 IdentifierInfo *CatName, SourceLocation CatLoc) { 898 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true); 899 ObjCCategoryDecl *CatIDecl = 0; 900 if (IDecl && IDecl->hasDefinition()) { 901 CatIDecl = IDecl->FindCategoryDeclaration(CatName); 902 if (!CatIDecl) { 903 // Category @implementation with no corresponding @interface. 904 // Create and install one. 905 CatIDecl = ObjCCategoryDecl::Create(Context, CurContext, AtCatImplLoc, 906 ClassLoc, CatLoc, 907 CatName, IDecl); 908 CatIDecl->setImplicit(); 909 } 910 } 911 912 ObjCCategoryImplDecl *CDecl = 913 ObjCCategoryImplDecl::Create(Context, CurContext, CatName, IDecl, 914 ClassLoc, AtCatImplLoc, CatLoc); 915 /// Check that class of this category is already completely declared. 916 if (!IDecl) { 917 Diag(ClassLoc, diag::err_undef_interface) << ClassName; 918 CDecl->setInvalidDecl(); 919 } else if (RequireCompleteType(ClassLoc, Context.getObjCInterfaceType(IDecl), 920 diag::err_undef_interface)) { 921 CDecl->setInvalidDecl(); 922 } 923 924 // FIXME: PushOnScopeChains? 925 CurContext->addDecl(CDecl); 926 927 // If the interface is deprecated/unavailable, warn/error about it. 928 if (IDecl) 929 DiagnoseUseOfDecl(IDecl, ClassLoc); 930 931 /// Check that CatName, category name, is not used in another implementation. 932 if (CatIDecl) { 933 if (CatIDecl->getImplementation()) { 934 Diag(ClassLoc, diag::err_dup_implementation_category) << ClassName 935 << CatName; 936 Diag(CatIDecl->getImplementation()->getLocation(), 937 diag::note_previous_definition); 938 } else { 939 CatIDecl->setImplementation(CDecl); 940 // Warn on implementating category of deprecated class under 941 // -Wdeprecated-implementations flag. 942 DiagnoseObjCImplementedDeprecations(*this, 943 dyn_cast<NamedDecl>(IDecl), 944 CDecl->getLocation(), 2); 945 } 946 } 947 948 CheckObjCDeclScope(CDecl); 949 return ActOnObjCContainerStartDefinition(CDecl); 950} 951 952Decl *Sema::ActOnStartClassImplementation( 953 SourceLocation AtClassImplLoc, 954 IdentifierInfo *ClassName, SourceLocation ClassLoc, 955 IdentifierInfo *SuperClassname, 956 SourceLocation SuperClassLoc) { 957 ObjCInterfaceDecl* IDecl = 0; 958 // Check for another declaration kind with the same name. 959 NamedDecl *PrevDecl 960 = LookupSingleName(TUScope, ClassName, ClassLoc, LookupOrdinaryName, 961 ForRedeclaration); 962 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 963 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName; 964 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 965 } else if ((IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl))) { 966 RequireCompleteType(ClassLoc, Context.getObjCInterfaceType(IDecl), 967 diag::warn_undef_interface); 968 } else { 969 // We did not find anything with the name ClassName; try to correct for 970 // typos in the class name. 971 ObjCInterfaceValidatorCCC Validator; 972 if (TypoCorrection Corrected = CorrectTypo( 973 DeclarationNameInfo(ClassName, ClassLoc), LookupOrdinaryName, TUScope, 974 NULL, Validator)) { 975 // Suggest the (potentially) correct interface name. However, put the 976 // fix-it hint itself in a separate note, since changing the name in 977 // the warning would make the fix-it change semantics.However, don't 978 // provide a code-modification hint or use the typo name for recovery, 979 // because this is just a warning. The program may actually be correct. 980 IDecl = Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>(); 981 DeclarationName CorrectedName = Corrected.getCorrection(); 982 Diag(ClassLoc, diag::warn_undef_interface_suggest) 983 << ClassName << CorrectedName; 984 Diag(IDecl->getLocation(), diag::note_previous_decl) << CorrectedName 985 << FixItHint::CreateReplacement(ClassLoc, CorrectedName.getAsString()); 986 IDecl = 0; 987 } else { 988 Diag(ClassLoc, diag::warn_undef_interface) << ClassName; 989 } 990 } 991 992 // Check that super class name is valid class name 993 ObjCInterfaceDecl* SDecl = 0; 994 if (SuperClassname) { 995 // Check if a different kind of symbol declared in this scope. 996 PrevDecl = LookupSingleName(TUScope, SuperClassname, SuperClassLoc, 997 LookupOrdinaryName); 998 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 999 Diag(SuperClassLoc, diag::err_redefinition_different_kind) 1000 << SuperClassname; 1001 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1002 } else { 1003 SDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 1004 if (SDecl && !SDecl->hasDefinition()) 1005 SDecl = 0; 1006 if (!SDecl) 1007 Diag(SuperClassLoc, diag::err_undef_superclass) 1008 << SuperClassname << ClassName; 1009 else if (IDecl && !declaresSameEntity(IDecl->getSuperClass(), SDecl)) { 1010 // This implementation and its interface do not have the same 1011 // super class. 1012 Diag(SuperClassLoc, diag::err_conflicting_super_class) 1013 << SDecl->getDeclName(); 1014 Diag(SDecl->getLocation(), diag::note_previous_definition); 1015 } 1016 } 1017 } 1018 1019 if (!IDecl) { 1020 // Legacy case of @implementation with no corresponding @interface. 1021 // Build, chain & install the interface decl into the identifier. 1022 1023 // FIXME: Do we support attributes on the @implementation? If so we should 1024 // copy them over. 1025 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtClassImplLoc, 1026 ClassName, /*PrevDecl=*/0, ClassLoc, 1027 true); 1028 IDecl->startDefinition(); 1029 if (SDecl) { 1030 IDecl->setSuperClass(SDecl); 1031 IDecl->setSuperClassLoc(SuperClassLoc); 1032 IDecl->setEndOfDefinitionLoc(SuperClassLoc); 1033 } else { 1034 IDecl->setEndOfDefinitionLoc(ClassLoc); 1035 } 1036 1037 PushOnScopeChains(IDecl, TUScope); 1038 } else { 1039 // Mark the interface as being completed, even if it was just as 1040 // @class ....; 1041 // declaration; the user cannot reopen it. 1042 if (!IDecl->hasDefinition()) 1043 IDecl->startDefinition(); 1044 } 1045 1046 ObjCImplementationDecl* IMPDecl = 1047 ObjCImplementationDecl::Create(Context, CurContext, IDecl, SDecl, 1048 ClassLoc, AtClassImplLoc, SuperClassLoc); 1049 1050 if (CheckObjCDeclScope(IMPDecl)) 1051 return ActOnObjCContainerStartDefinition(IMPDecl); 1052 1053 // Check that there is no duplicate implementation of this class. 1054 if (IDecl->getImplementation()) { 1055 // FIXME: Don't leak everything! 1056 Diag(ClassLoc, diag::err_dup_implementation_class) << ClassName; 1057 Diag(IDecl->getImplementation()->getLocation(), 1058 diag::note_previous_definition); 1059 } else { // add it to the list. 1060 IDecl->setImplementation(IMPDecl); 1061 PushOnScopeChains(IMPDecl, TUScope); 1062 // Warn on implementating deprecated class under 1063 // -Wdeprecated-implementations flag. 1064 DiagnoseObjCImplementedDeprecations(*this, 1065 dyn_cast<NamedDecl>(IDecl), 1066 IMPDecl->getLocation(), 1); 1067 } 1068 return ActOnObjCContainerStartDefinition(IMPDecl); 1069} 1070 1071Sema::DeclGroupPtrTy 1072Sema::ActOnFinishObjCImplementation(Decl *ObjCImpDecl, ArrayRef<Decl *> Decls) { 1073 SmallVector<Decl *, 64> DeclsInGroup; 1074 DeclsInGroup.reserve(Decls.size() + 1); 1075 1076 for (unsigned i = 0, e = Decls.size(); i != e; ++i) { 1077 Decl *Dcl = Decls[i]; 1078 if (!Dcl) 1079 continue; 1080 if (Dcl->getDeclContext()->isFileContext()) 1081 Dcl->setTopLevelDeclInObjCContainer(); 1082 DeclsInGroup.push_back(Dcl); 1083 } 1084 1085 DeclsInGroup.push_back(ObjCImpDecl); 1086 1087 return BuildDeclaratorGroup(DeclsInGroup.data(), DeclsInGroup.size(), false); 1088} 1089 1090void Sema::CheckImplementationIvars(ObjCImplementationDecl *ImpDecl, 1091 ObjCIvarDecl **ivars, unsigned numIvars, 1092 SourceLocation RBrace) { 1093 assert(ImpDecl && "missing implementation decl"); 1094 ObjCInterfaceDecl* IDecl = ImpDecl->getClassInterface(); 1095 if (!IDecl) 1096 return; 1097 /// Check case of non-existing \@interface decl. 1098 /// (legacy objective-c \@implementation decl without an \@interface decl). 1099 /// Add implementations's ivar to the synthesize class's ivar list. 1100 if (IDecl->isImplicitInterfaceDecl()) { 1101 IDecl->setEndOfDefinitionLoc(RBrace); 1102 // Add ivar's to class's DeclContext. 1103 for (unsigned i = 0, e = numIvars; i != e; ++i) { 1104 ivars[i]->setLexicalDeclContext(ImpDecl); 1105 IDecl->makeDeclVisibleInContext(ivars[i]); 1106 ImpDecl->addDecl(ivars[i]); 1107 } 1108 1109 return; 1110 } 1111 // If implementation has empty ivar list, just return. 1112 if (numIvars == 0) 1113 return; 1114 1115 assert(ivars && "missing @implementation ivars"); 1116 if (LangOpts.ObjCRuntime.isNonFragile()) { 1117 if (ImpDecl->getSuperClass()) 1118 Diag(ImpDecl->getLocation(), diag::warn_on_superclass_use); 1119 for (unsigned i = 0; i < numIvars; i++) { 1120 ObjCIvarDecl* ImplIvar = ivars[i]; 1121 if (const ObjCIvarDecl *ClsIvar = 1122 IDecl->getIvarDecl(ImplIvar->getIdentifier())) { 1123 Diag(ImplIvar->getLocation(), diag::err_duplicate_ivar_declaration); 1124 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 1125 continue; 1126 } 1127 // Instance ivar to Implementation's DeclContext. 1128 ImplIvar->setLexicalDeclContext(ImpDecl); 1129 IDecl->makeDeclVisibleInContext(ImplIvar); 1130 ImpDecl->addDecl(ImplIvar); 1131 } 1132 return; 1133 } 1134 // Check interface's Ivar list against those in the implementation. 1135 // names and types must match. 1136 // 1137 unsigned j = 0; 1138 ObjCInterfaceDecl::ivar_iterator 1139 IVI = IDecl->ivar_begin(), IVE = IDecl->ivar_end(); 1140 for (; numIvars > 0 && IVI != IVE; ++IVI) { 1141 ObjCIvarDecl* ImplIvar = ivars[j++]; 1142 ObjCIvarDecl* ClsIvar = *IVI; 1143 assert (ImplIvar && "missing implementation ivar"); 1144 assert (ClsIvar && "missing class ivar"); 1145 1146 // First, make sure the types match. 1147 if (!Context.hasSameType(ImplIvar->getType(), ClsIvar->getType())) { 1148 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_type) 1149 << ImplIvar->getIdentifier() 1150 << ImplIvar->getType() << ClsIvar->getType(); 1151 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 1152 } else if (ImplIvar->isBitField() && ClsIvar->isBitField() && 1153 ImplIvar->getBitWidthValue(Context) != 1154 ClsIvar->getBitWidthValue(Context)) { 1155 Diag(ImplIvar->getBitWidth()->getLocStart(), 1156 diag::err_conflicting_ivar_bitwidth) << ImplIvar->getIdentifier(); 1157 Diag(ClsIvar->getBitWidth()->getLocStart(), 1158 diag::note_previous_definition); 1159 } 1160 // Make sure the names are identical. 1161 if (ImplIvar->getIdentifier() != ClsIvar->getIdentifier()) { 1162 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_name) 1163 << ImplIvar->getIdentifier() << ClsIvar->getIdentifier(); 1164 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 1165 } 1166 --numIvars; 1167 } 1168 1169 if (numIvars > 0) 1170 Diag(ivars[j]->getLocation(), diag::err_inconsistant_ivar_count); 1171 else if (IVI != IVE) 1172 Diag(IVI->getLocation(), diag::err_inconsistant_ivar_count); 1173} 1174 1175void Sema::WarnUndefinedMethod(SourceLocation ImpLoc, ObjCMethodDecl *method, 1176 bool &IncompleteImpl, unsigned DiagID) { 1177 // No point warning no definition of method which is 'unavailable'. 1178 switch (method->getAvailability()) { 1179 case AR_Available: 1180 case AR_Deprecated: 1181 break; 1182 1183 // Don't warn about unavailable or not-yet-introduced methods. 1184 case AR_NotYetIntroduced: 1185 case AR_Unavailable: 1186 return; 1187 } 1188 1189 // FIXME: For now ignore 'IncompleteImpl'. 1190 // Previously we grouped all unimplemented methods under a single 1191 // warning, but some users strongly voiced that they would prefer 1192 // separate warnings. We will give that approach a try, as that 1193 // matches what we do with protocols. 1194 1195 Diag(ImpLoc, DiagID) << method->getDeclName(); 1196 1197 // Issue a note to the original declaration. 1198 SourceLocation MethodLoc = method->getLocStart(); 1199 if (MethodLoc.isValid()) 1200 Diag(MethodLoc, diag::note_method_declared_at) << method; 1201} 1202 1203/// Determines if type B can be substituted for type A. Returns true if we can 1204/// guarantee that anything that the user will do to an object of type A can 1205/// also be done to an object of type B. This is trivially true if the two 1206/// types are the same, or if B is a subclass of A. It becomes more complex 1207/// in cases where protocols are involved. 1208/// 1209/// Object types in Objective-C describe the minimum requirements for an 1210/// object, rather than providing a complete description of a type. For 1211/// example, if A is a subclass of B, then B* may refer to an instance of A. 1212/// The principle of substitutability means that we may use an instance of A 1213/// anywhere that we may use an instance of B - it will implement all of the 1214/// ivars of B and all of the methods of B. 1215/// 1216/// This substitutability is important when type checking methods, because 1217/// the implementation may have stricter type definitions than the interface. 1218/// The interface specifies minimum requirements, but the implementation may 1219/// have more accurate ones. For example, a method may privately accept 1220/// instances of B, but only publish that it accepts instances of A. Any 1221/// object passed to it will be type checked against B, and so will implicitly 1222/// by a valid A*. Similarly, a method may return a subclass of the class that 1223/// it is declared as returning. 1224/// 1225/// This is most important when considering subclassing. A method in a 1226/// subclass must accept any object as an argument that its superclass's 1227/// implementation accepts. It may, however, accept a more general type 1228/// without breaking substitutability (i.e. you can still use the subclass 1229/// anywhere that you can use the superclass, but not vice versa). The 1230/// converse requirement applies to return types: the return type for a 1231/// subclass method must be a valid object of the kind that the superclass 1232/// advertises, but it may be specified more accurately. This avoids the need 1233/// for explicit down-casting by callers. 1234/// 1235/// Note: This is a stricter requirement than for assignment. 1236static bool isObjCTypeSubstitutable(ASTContext &Context, 1237 const ObjCObjectPointerType *A, 1238 const ObjCObjectPointerType *B, 1239 bool rejectId) { 1240 // Reject a protocol-unqualified id. 1241 if (rejectId && B->isObjCIdType()) return false; 1242 1243 // If B is a qualified id, then A must also be a qualified id and it must 1244 // implement all of the protocols in B. It may not be a qualified class. 1245 // For example, MyClass<A> can be assigned to id<A>, but MyClass<A> is a 1246 // stricter definition so it is not substitutable for id<A>. 1247 if (B->isObjCQualifiedIdType()) { 1248 return A->isObjCQualifiedIdType() && 1249 Context.ObjCQualifiedIdTypesAreCompatible(QualType(A, 0), 1250 QualType(B,0), 1251 false); 1252 } 1253 1254 /* 1255 // id is a special type that bypasses type checking completely. We want a 1256 // warning when it is used in one place but not another. 1257 if (C.isObjCIdType(A) || C.isObjCIdType(B)) return false; 1258 1259 1260 // If B is a qualified id, then A must also be a qualified id (which it isn't 1261 // if we've got this far) 1262 if (B->isObjCQualifiedIdType()) return false; 1263 */ 1264 1265 // Now we know that A and B are (potentially-qualified) class types. The 1266 // normal rules for assignment apply. 1267 return Context.canAssignObjCInterfaces(A, B); 1268} 1269 1270static SourceRange getTypeRange(TypeSourceInfo *TSI) { 1271 return (TSI ? TSI->getTypeLoc().getSourceRange() : SourceRange()); 1272} 1273 1274static bool CheckMethodOverrideReturn(Sema &S, 1275 ObjCMethodDecl *MethodImpl, 1276 ObjCMethodDecl *MethodDecl, 1277 bool IsProtocolMethodDecl, 1278 bool IsOverridingMode, 1279 bool Warn) { 1280 if (IsProtocolMethodDecl && 1281 (MethodDecl->getObjCDeclQualifier() != 1282 MethodImpl->getObjCDeclQualifier())) { 1283 if (Warn) { 1284 S.Diag(MethodImpl->getLocation(), 1285 (IsOverridingMode ? 1286 diag::warn_conflicting_overriding_ret_type_modifiers 1287 : diag::warn_conflicting_ret_type_modifiers)) 1288 << MethodImpl->getDeclName() 1289 << getTypeRange(MethodImpl->getResultTypeSourceInfo()); 1290 S.Diag(MethodDecl->getLocation(), diag::note_previous_declaration) 1291 << getTypeRange(MethodDecl->getResultTypeSourceInfo()); 1292 } 1293 else 1294 return false; 1295 } 1296 1297 if (S.Context.hasSameUnqualifiedType(MethodImpl->getResultType(), 1298 MethodDecl->getResultType())) 1299 return true; 1300 if (!Warn) 1301 return false; 1302 1303 unsigned DiagID = 1304 IsOverridingMode ? diag::warn_conflicting_overriding_ret_types 1305 : diag::warn_conflicting_ret_types; 1306 1307 // Mismatches between ObjC pointers go into a different warning 1308 // category, and sometimes they're even completely whitelisted. 1309 if (const ObjCObjectPointerType *ImplPtrTy = 1310 MethodImpl->getResultType()->getAs<ObjCObjectPointerType>()) { 1311 if (const ObjCObjectPointerType *IfacePtrTy = 1312 MethodDecl->getResultType()->getAs<ObjCObjectPointerType>()) { 1313 // Allow non-matching return types as long as they don't violate 1314 // the principle of substitutability. Specifically, we permit 1315 // return types that are subclasses of the declared return type, 1316 // or that are more-qualified versions of the declared type. 1317 if (isObjCTypeSubstitutable(S.Context, IfacePtrTy, ImplPtrTy, false)) 1318 return false; 1319 1320 DiagID = 1321 IsOverridingMode ? diag::warn_non_covariant_overriding_ret_types 1322 : diag::warn_non_covariant_ret_types; 1323 } 1324 } 1325 1326 S.Diag(MethodImpl->getLocation(), DiagID) 1327 << MethodImpl->getDeclName() 1328 << MethodDecl->getResultType() 1329 << MethodImpl->getResultType() 1330 << getTypeRange(MethodImpl->getResultTypeSourceInfo()); 1331 S.Diag(MethodDecl->getLocation(), 1332 IsOverridingMode ? diag::note_previous_declaration 1333 : diag::note_previous_definition) 1334 << getTypeRange(MethodDecl->getResultTypeSourceInfo()); 1335 return false; 1336} 1337 1338static bool CheckMethodOverrideParam(Sema &S, 1339 ObjCMethodDecl *MethodImpl, 1340 ObjCMethodDecl *MethodDecl, 1341 ParmVarDecl *ImplVar, 1342 ParmVarDecl *IfaceVar, 1343 bool IsProtocolMethodDecl, 1344 bool IsOverridingMode, 1345 bool Warn) { 1346 if (IsProtocolMethodDecl && 1347 (ImplVar->getObjCDeclQualifier() != 1348 IfaceVar->getObjCDeclQualifier())) { 1349 if (Warn) { 1350 if (IsOverridingMode) 1351 S.Diag(ImplVar->getLocation(), 1352 diag::warn_conflicting_overriding_param_modifiers) 1353 << getTypeRange(ImplVar->getTypeSourceInfo()) 1354 << MethodImpl->getDeclName(); 1355 else S.Diag(ImplVar->getLocation(), 1356 diag::warn_conflicting_param_modifiers) 1357 << getTypeRange(ImplVar->getTypeSourceInfo()) 1358 << MethodImpl->getDeclName(); 1359 S.Diag(IfaceVar->getLocation(), diag::note_previous_declaration) 1360 << getTypeRange(IfaceVar->getTypeSourceInfo()); 1361 } 1362 else 1363 return false; 1364 } 1365 1366 QualType ImplTy = ImplVar->getType(); 1367 QualType IfaceTy = IfaceVar->getType(); 1368 1369 if (S.Context.hasSameUnqualifiedType(ImplTy, IfaceTy)) 1370 return true; 1371 1372 if (!Warn) 1373 return false; 1374 unsigned DiagID = 1375 IsOverridingMode ? diag::warn_conflicting_overriding_param_types 1376 : diag::warn_conflicting_param_types; 1377 1378 // Mismatches between ObjC pointers go into a different warning 1379 // category, and sometimes they're even completely whitelisted. 1380 if (const ObjCObjectPointerType *ImplPtrTy = 1381 ImplTy->getAs<ObjCObjectPointerType>()) { 1382 if (const ObjCObjectPointerType *IfacePtrTy = 1383 IfaceTy->getAs<ObjCObjectPointerType>()) { 1384 // Allow non-matching argument types as long as they don't 1385 // violate the principle of substitutability. Specifically, the 1386 // implementation must accept any objects that the superclass 1387 // accepts, however it may also accept others. 1388 if (isObjCTypeSubstitutable(S.Context, ImplPtrTy, IfacePtrTy, true)) 1389 return false; 1390 1391 DiagID = 1392 IsOverridingMode ? diag::warn_non_contravariant_overriding_param_types 1393 : diag::warn_non_contravariant_param_types; 1394 } 1395 } 1396 1397 S.Diag(ImplVar->getLocation(), DiagID) 1398 << getTypeRange(ImplVar->getTypeSourceInfo()) 1399 << MethodImpl->getDeclName() << IfaceTy << ImplTy; 1400 S.Diag(IfaceVar->getLocation(), 1401 (IsOverridingMode ? diag::note_previous_declaration 1402 : diag::note_previous_definition)) 1403 << getTypeRange(IfaceVar->getTypeSourceInfo()); 1404 return false; 1405} 1406 1407/// In ARC, check whether the conventional meanings of the two methods 1408/// match. If they don't, it's a hard error. 1409static bool checkMethodFamilyMismatch(Sema &S, ObjCMethodDecl *impl, 1410 ObjCMethodDecl *decl) { 1411 ObjCMethodFamily implFamily = impl->getMethodFamily(); 1412 ObjCMethodFamily declFamily = decl->getMethodFamily(); 1413 if (implFamily == declFamily) return false; 1414 1415 // Since conventions are sorted by selector, the only possibility is 1416 // that the types differ enough to cause one selector or the other 1417 // to fall out of the family. 1418 assert(implFamily == OMF_None || declFamily == OMF_None); 1419 1420 // No further diagnostics required on invalid declarations. 1421 if (impl->isInvalidDecl() || decl->isInvalidDecl()) return true; 1422 1423 const ObjCMethodDecl *unmatched = impl; 1424 ObjCMethodFamily family = declFamily; 1425 unsigned errorID = diag::err_arc_lost_method_convention; 1426 unsigned noteID = diag::note_arc_lost_method_convention; 1427 if (declFamily == OMF_None) { 1428 unmatched = decl; 1429 family = implFamily; 1430 errorID = diag::err_arc_gained_method_convention; 1431 noteID = diag::note_arc_gained_method_convention; 1432 } 1433 1434 // Indexes into a %select clause in the diagnostic. 1435 enum FamilySelector { 1436 F_alloc, F_copy, F_mutableCopy = F_copy, F_init, F_new 1437 }; 1438 FamilySelector familySelector = FamilySelector(); 1439 1440 switch (family) { 1441 case OMF_None: llvm_unreachable("logic error, no method convention"); 1442 case OMF_retain: 1443 case OMF_release: 1444 case OMF_autorelease: 1445 case OMF_dealloc: 1446 case OMF_finalize: 1447 case OMF_retainCount: 1448 case OMF_self: 1449 case OMF_performSelector: 1450 // Mismatches for these methods don't change ownership 1451 // conventions, so we don't care. 1452 return false; 1453 1454 case OMF_init: familySelector = F_init; break; 1455 case OMF_alloc: familySelector = F_alloc; break; 1456 case OMF_copy: familySelector = F_copy; break; 1457 case OMF_mutableCopy: familySelector = F_mutableCopy; break; 1458 case OMF_new: familySelector = F_new; break; 1459 } 1460 1461 enum ReasonSelector { R_NonObjectReturn, R_UnrelatedReturn }; 1462 ReasonSelector reasonSelector; 1463 1464 // The only reason these methods don't fall within their families is 1465 // due to unusual result types. 1466 if (unmatched->getResultType()->isObjCObjectPointerType()) { 1467 reasonSelector = R_UnrelatedReturn; 1468 } else { 1469 reasonSelector = R_NonObjectReturn; 1470 } 1471 1472 S.Diag(impl->getLocation(), errorID) << familySelector << reasonSelector; 1473 S.Diag(decl->getLocation(), noteID) << familySelector << reasonSelector; 1474 1475 return true; 1476} 1477 1478void Sema::WarnConflictingTypedMethods(ObjCMethodDecl *ImpMethodDecl, 1479 ObjCMethodDecl *MethodDecl, 1480 bool IsProtocolMethodDecl) { 1481 if (getLangOpts().ObjCAutoRefCount && 1482 checkMethodFamilyMismatch(*this, ImpMethodDecl, MethodDecl)) 1483 return; 1484 1485 CheckMethodOverrideReturn(*this, ImpMethodDecl, MethodDecl, 1486 IsProtocolMethodDecl, false, 1487 true); 1488 1489 for (ObjCMethodDecl::param_iterator IM = ImpMethodDecl->param_begin(), 1490 IF = MethodDecl->param_begin(), EM = ImpMethodDecl->param_end(), 1491 EF = MethodDecl->param_end(); 1492 IM != EM && IF != EF; ++IM, ++IF) { 1493 CheckMethodOverrideParam(*this, ImpMethodDecl, MethodDecl, *IM, *IF, 1494 IsProtocolMethodDecl, false, true); 1495 } 1496 1497 if (ImpMethodDecl->isVariadic() != MethodDecl->isVariadic()) { 1498 Diag(ImpMethodDecl->getLocation(), 1499 diag::warn_conflicting_variadic); 1500 Diag(MethodDecl->getLocation(), diag::note_previous_declaration); 1501 } 1502} 1503 1504void Sema::CheckConflictingOverridingMethod(ObjCMethodDecl *Method, 1505 ObjCMethodDecl *Overridden, 1506 bool IsProtocolMethodDecl) { 1507 1508 CheckMethodOverrideReturn(*this, Method, Overridden, 1509 IsProtocolMethodDecl, true, 1510 true); 1511 1512 for (ObjCMethodDecl::param_iterator IM = Method->param_begin(), 1513 IF = Overridden->param_begin(), EM = Method->param_end(), 1514 EF = Overridden->param_end(); 1515 IM != EM && IF != EF; ++IM, ++IF) { 1516 CheckMethodOverrideParam(*this, Method, Overridden, *IM, *IF, 1517 IsProtocolMethodDecl, true, true); 1518 } 1519 1520 if (Method->isVariadic() != Overridden->isVariadic()) { 1521 Diag(Method->getLocation(), 1522 diag::warn_conflicting_overriding_variadic); 1523 Diag(Overridden->getLocation(), diag::note_previous_declaration); 1524 } 1525} 1526 1527/// WarnExactTypedMethods - This routine issues a warning if method 1528/// implementation declaration matches exactly that of its declaration. 1529void Sema::WarnExactTypedMethods(ObjCMethodDecl *ImpMethodDecl, 1530 ObjCMethodDecl *MethodDecl, 1531 bool IsProtocolMethodDecl) { 1532 // don't issue warning when protocol method is optional because primary 1533 // class is not required to implement it and it is safe for protocol 1534 // to implement it. 1535 if (MethodDecl->getImplementationControl() == ObjCMethodDecl::Optional) 1536 return; 1537 // don't issue warning when primary class's method is 1538 // depecated/unavailable. 1539 if (MethodDecl->hasAttr<UnavailableAttr>() || 1540 MethodDecl->hasAttr<DeprecatedAttr>()) 1541 return; 1542 1543 bool match = CheckMethodOverrideReturn(*this, ImpMethodDecl, MethodDecl, 1544 IsProtocolMethodDecl, false, false); 1545 if (match) 1546 for (ObjCMethodDecl::param_iterator IM = ImpMethodDecl->param_begin(), 1547 IF = MethodDecl->param_begin(), EM = ImpMethodDecl->param_end(), 1548 EF = MethodDecl->param_end(); 1549 IM != EM && IF != EF; ++IM, ++IF) { 1550 match = CheckMethodOverrideParam(*this, ImpMethodDecl, MethodDecl, 1551 *IM, *IF, 1552 IsProtocolMethodDecl, false, false); 1553 if (!match) 1554 break; 1555 } 1556 if (match) 1557 match = (ImpMethodDecl->isVariadic() == MethodDecl->isVariadic()); 1558 if (match) 1559 match = !(MethodDecl->isClassMethod() && 1560 MethodDecl->getSelector() == GetNullarySelector("load", Context)); 1561 1562 if (match) { 1563 Diag(ImpMethodDecl->getLocation(), 1564 diag::warn_category_method_impl_match); 1565 Diag(MethodDecl->getLocation(), diag::note_method_declared_at) 1566 << MethodDecl->getDeclName(); 1567 } 1568} 1569 1570/// FIXME: Type hierarchies in Objective-C can be deep. We could most likely 1571/// improve the efficiency of selector lookups and type checking by associating 1572/// with each protocol / interface / category the flattened instance tables. If 1573/// we used an immutable set to keep the table then it wouldn't add significant 1574/// memory cost and it would be handy for lookups. 1575 1576/// CheckProtocolMethodDefs - This routine checks unimplemented methods 1577/// Declared in protocol, and those referenced by it. 1578void Sema::CheckProtocolMethodDefs(SourceLocation ImpLoc, 1579 ObjCProtocolDecl *PDecl, 1580 bool& IncompleteImpl, 1581 const SelectorSet &InsMap, 1582 const SelectorSet &ClsMap, 1583 ObjCContainerDecl *CDecl) { 1584 ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl); 1585 ObjCInterfaceDecl *IDecl = C ? C->getClassInterface() 1586 : dyn_cast<ObjCInterfaceDecl>(CDecl); 1587 assert (IDecl && "CheckProtocolMethodDefs - IDecl is null"); 1588 1589 ObjCInterfaceDecl *Super = IDecl->getSuperClass(); 1590 ObjCInterfaceDecl *NSIDecl = 0; 1591 if (getLangOpts().ObjCRuntime.isNeXTFamily()) { 1592 // check to see if class implements forwardInvocation method and objects 1593 // of this class are derived from 'NSProxy' so that to forward requests 1594 // from one object to another. 1595 // Under such conditions, which means that every method possible is 1596 // implemented in the class, we should not issue "Method definition not 1597 // found" warnings. 1598 // FIXME: Use a general GetUnarySelector method for this. 1599 IdentifierInfo* II = &Context.Idents.get("forwardInvocation"); 1600 Selector fISelector = Context.Selectors.getSelector(1, &II); 1601 if (InsMap.count(fISelector)) 1602 // Is IDecl derived from 'NSProxy'? If so, no instance methods 1603 // need be implemented in the implementation. 1604 NSIDecl = IDecl->lookupInheritedClass(&Context.Idents.get("NSProxy")); 1605 } 1606 1607 // If this is a forward protocol declaration, get its definition. 1608 if (!PDecl->isThisDeclarationADefinition() && 1609 PDecl->getDefinition()) 1610 PDecl = PDecl->getDefinition(); 1611 1612 // If a method lookup fails locally we still need to look and see if 1613 // the method was implemented by a base class or an inherited 1614 // protocol. This lookup is slow, but occurs rarely in correct code 1615 // and otherwise would terminate in a warning. 1616 1617 // check unimplemented instance methods. 1618 if (!NSIDecl) 1619 for (ObjCProtocolDecl::instmeth_iterator I = PDecl->instmeth_begin(), 1620 E = PDecl->instmeth_end(); I != E; ++I) { 1621 ObjCMethodDecl *method = *I; 1622 if (method->getImplementationControl() != ObjCMethodDecl::Optional && 1623 !method->isPropertyAccessor() && 1624 !InsMap.count(method->getSelector()) && 1625 (!Super || !Super->lookupInstanceMethod(method->getSelector()))) { 1626 // If a method is not implemented in the category implementation but 1627 // has been declared in its primary class, superclass, 1628 // or in one of their protocols, no need to issue the warning. 1629 // This is because method will be implemented in the primary class 1630 // or one of its super class implementation. 1631 1632 // Ugly, but necessary. Method declared in protcol might have 1633 // have been synthesized due to a property declared in the class which 1634 // uses the protocol. 1635 if (ObjCMethodDecl *MethodInClass = 1636 IDecl->lookupInstanceMethod(method->getSelector(), 1637 true /*shallowCategoryLookup*/)) 1638 if (C || MethodInClass->isPropertyAccessor()) 1639 continue; 1640 unsigned DIAG = diag::warn_unimplemented_protocol_method; 1641 if (Diags.getDiagnosticLevel(DIAG, ImpLoc) 1642 != DiagnosticsEngine::Ignored) { 1643 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG); 1644 Diag(CDecl->getLocation(), diag::note_required_for_protocol_at) 1645 << PDecl->getDeclName(); 1646 } 1647 } 1648 } 1649 // check unimplemented class methods 1650 for (ObjCProtocolDecl::classmeth_iterator 1651 I = PDecl->classmeth_begin(), E = PDecl->classmeth_end(); 1652 I != E; ++I) { 1653 ObjCMethodDecl *method = *I; 1654 if (method->getImplementationControl() != ObjCMethodDecl::Optional && 1655 !ClsMap.count(method->getSelector()) && 1656 (!Super || !Super->lookupClassMethod(method->getSelector()))) { 1657 // See above comment for instance method lookups. 1658 if (C && IDecl->lookupClassMethod(method->getSelector(), 1659 true /*shallowCategoryLookup*/)) 1660 continue; 1661 unsigned DIAG = diag::warn_unimplemented_protocol_method; 1662 if (Diags.getDiagnosticLevel(DIAG, ImpLoc) != 1663 DiagnosticsEngine::Ignored) { 1664 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG); 1665 Diag(IDecl->getLocation(), diag::note_required_for_protocol_at) << 1666 PDecl->getDeclName(); 1667 } 1668 } 1669 } 1670 // Check on this protocols's referenced protocols, recursively. 1671 for (ObjCProtocolDecl::protocol_iterator PI = PDecl->protocol_begin(), 1672 E = PDecl->protocol_end(); PI != E; ++PI) 1673 CheckProtocolMethodDefs(ImpLoc, *PI, IncompleteImpl, InsMap, ClsMap, CDecl); 1674} 1675 1676/// MatchAllMethodDeclarations - Check methods declared in interface 1677/// or protocol against those declared in their implementations. 1678/// 1679void Sema::MatchAllMethodDeclarations(const SelectorSet &InsMap, 1680 const SelectorSet &ClsMap, 1681 SelectorSet &InsMapSeen, 1682 SelectorSet &ClsMapSeen, 1683 ObjCImplDecl* IMPDecl, 1684 ObjCContainerDecl* CDecl, 1685 bool &IncompleteImpl, 1686 bool ImmediateClass, 1687 bool WarnCategoryMethodImpl) { 1688 // Check and see if instance methods in class interface have been 1689 // implemented in the implementation class. If so, their types match. 1690 for (ObjCInterfaceDecl::instmeth_iterator I = CDecl->instmeth_begin(), 1691 E = CDecl->instmeth_end(); I != E; ++I) { 1692 if (InsMapSeen.count((*I)->getSelector())) 1693 continue; 1694 InsMapSeen.insert((*I)->getSelector()); 1695 if (!(*I)->isPropertyAccessor() && 1696 !InsMap.count((*I)->getSelector())) { 1697 if (ImmediateClass) 1698 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl, 1699 diag::warn_undef_method_impl); 1700 continue; 1701 } else { 1702 ObjCMethodDecl *ImpMethodDecl = 1703 IMPDecl->getInstanceMethod((*I)->getSelector()); 1704 assert(CDecl->getInstanceMethod((*I)->getSelector()) && 1705 "Expected to find the method through lookup as well"); 1706 ObjCMethodDecl *MethodDecl = *I; 1707 // ImpMethodDecl may be null as in a @dynamic property. 1708 if (ImpMethodDecl) { 1709 if (!WarnCategoryMethodImpl) 1710 WarnConflictingTypedMethods(ImpMethodDecl, MethodDecl, 1711 isa<ObjCProtocolDecl>(CDecl)); 1712 else if (!MethodDecl->isPropertyAccessor()) 1713 WarnExactTypedMethods(ImpMethodDecl, MethodDecl, 1714 isa<ObjCProtocolDecl>(CDecl)); 1715 } 1716 } 1717 } 1718 1719 // Check and see if class methods in class interface have been 1720 // implemented in the implementation class. If so, their types match. 1721 for (ObjCInterfaceDecl::classmeth_iterator 1722 I = CDecl->classmeth_begin(), E = CDecl->classmeth_end(); I != E; ++I) { 1723 if (ClsMapSeen.count((*I)->getSelector())) 1724 continue; 1725 ClsMapSeen.insert((*I)->getSelector()); 1726 if (!ClsMap.count((*I)->getSelector())) { 1727 if (ImmediateClass) 1728 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl, 1729 diag::warn_undef_method_impl); 1730 } else { 1731 ObjCMethodDecl *ImpMethodDecl = 1732 IMPDecl->getClassMethod((*I)->getSelector()); 1733 assert(CDecl->getClassMethod((*I)->getSelector()) && 1734 "Expected to find the method through lookup as well"); 1735 ObjCMethodDecl *MethodDecl = *I; 1736 if (!WarnCategoryMethodImpl) 1737 WarnConflictingTypedMethods(ImpMethodDecl, MethodDecl, 1738 isa<ObjCProtocolDecl>(CDecl)); 1739 else 1740 WarnExactTypedMethods(ImpMethodDecl, MethodDecl, 1741 isa<ObjCProtocolDecl>(CDecl)); 1742 } 1743 } 1744 1745 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) { 1746 // when checking that methods in implementation match their declaration, 1747 // i.e. when WarnCategoryMethodImpl is false, check declarations in class 1748 // extension; as well as those in categories. 1749 if (!WarnCategoryMethodImpl) { 1750 for (ObjCInterfaceDecl::visible_categories_iterator 1751 Cat = I->visible_categories_begin(), 1752 CatEnd = I->visible_categories_end(); 1753 Cat != CatEnd; ++Cat) { 1754 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1755 IMPDecl, *Cat, IncompleteImpl, false, 1756 WarnCategoryMethodImpl); 1757 } 1758 } else { 1759 // Also methods in class extensions need be looked at next. 1760 for (ObjCInterfaceDecl::visible_extensions_iterator 1761 Ext = I->visible_extensions_begin(), 1762 ExtEnd = I->visible_extensions_end(); 1763 Ext != ExtEnd; ++Ext) { 1764 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1765 IMPDecl, *Ext, IncompleteImpl, false, 1766 WarnCategoryMethodImpl); 1767 } 1768 } 1769 1770 // Check for any implementation of a methods declared in protocol. 1771 for (ObjCInterfaceDecl::all_protocol_iterator 1772 PI = I->all_referenced_protocol_begin(), 1773 E = I->all_referenced_protocol_end(); PI != E; ++PI) 1774 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1775 IMPDecl, 1776 (*PI), IncompleteImpl, false, 1777 WarnCategoryMethodImpl); 1778 1779 // FIXME. For now, we are not checking for extact match of methods 1780 // in category implementation and its primary class's super class. 1781 if (!WarnCategoryMethodImpl && I->getSuperClass()) 1782 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1783 IMPDecl, 1784 I->getSuperClass(), IncompleteImpl, false); 1785 } 1786} 1787 1788/// CheckCategoryVsClassMethodMatches - Checks that methods implemented in 1789/// category matches with those implemented in its primary class and 1790/// warns each time an exact match is found. 1791void Sema::CheckCategoryVsClassMethodMatches( 1792 ObjCCategoryImplDecl *CatIMPDecl) { 1793 SelectorSet InsMap, ClsMap; 1794 1795 for (ObjCImplementationDecl::instmeth_iterator 1796 I = CatIMPDecl->instmeth_begin(), 1797 E = CatIMPDecl->instmeth_end(); I!=E; ++I) 1798 InsMap.insert((*I)->getSelector()); 1799 1800 for (ObjCImplementationDecl::classmeth_iterator 1801 I = CatIMPDecl->classmeth_begin(), 1802 E = CatIMPDecl->classmeth_end(); I != E; ++I) 1803 ClsMap.insert((*I)->getSelector()); 1804 if (InsMap.empty() && ClsMap.empty()) 1805 return; 1806 1807 // Get category's primary class. 1808 ObjCCategoryDecl *CatDecl = CatIMPDecl->getCategoryDecl(); 1809 if (!CatDecl) 1810 return; 1811 ObjCInterfaceDecl *IDecl = CatDecl->getClassInterface(); 1812 if (!IDecl) 1813 return; 1814 SelectorSet InsMapSeen, ClsMapSeen; 1815 bool IncompleteImpl = false; 1816 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1817 CatIMPDecl, IDecl, 1818 IncompleteImpl, false, 1819 true /*WarnCategoryMethodImpl*/); 1820} 1821 1822void Sema::ImplMethodsVsClassMethods(Scope *S, ObjCImplDecl* IMPDecl, 1823 ObjCContainerDecl* CDecl, 1824 bool IncompleteImpl) { 1825 SelectorSet InsMap; 1826 // Check and see if instance methods in class interface have been 1827 // implemented in the implementation class. 1828 for (ObjCImplementationDecl::instmeth_iterator 1829 I = IMPDecl->instmeth_begin(), E = IMPDecl->instmeth_end(); I!=E; ++I) 1830 InsMap.insert((*I)->getSelector()); 1831 1832 // Check and see if properties declared in the interface have either 1) 1833 // an implementation or 2) there is a @synthesize/@dynamic implementation 1834 // of the property in the @implementation. 1835 if (const ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(CDecl)) 1836 if (!(LangOpts.ObjCDefaultSynthProperties && 1837 LangOpts.ObjCRuntime.isNonFragile()) || 1838 IDecl->isObjCRequiresPropertyDefs()) 1839 DiagnoseUnimplementedProperties(S, IMPDecl, CDecl); 1840 1841 SelectorSet ClsMap; 1842 for (ObjCImplementationDecl::classmeth_iterator 1843 I = IMPDecl->classmeth_begin(), 1844 E = IMPDecl->classmeth_end(); I != E; ++I) 1845 ClsMap.insert((*I)->getSelector()); 1846 1847 // Check for type conflict of methods declared in a class/protocol and 1848 // its implementation; if any. 1849 SelectorSet InsMapSeen, ClsMapSeen; 1850 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1851 IMPDecl, CDecl, 1852 IncompleteImpl, true); 1853 1854 // check all methods implemented in category against those declared 1855 // in its primary class. 1856 if (ObjCCategoryImplDecl *CatDecl = 1857 dyn_cast<ObjCCategoryImplDecl>(IMPDecl)) 1858 CheckCategoryVsClassMethodMatches(CatDecl); 1859 1860 // Check the protocol list for unimplemented methods in the @implementation 1861 // class. 1862 // Check and see if class methods in class interface have been 1863 // implemented in the implementation class. 1864 1865 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) { 1866 for (ObjCInterfaceDecl::all_protocol_iterator 1867 PI = I->all_referenced_protocol_begin(), 1868 E = I->all_referenced_protocol_end(); PI != E; ++PI) 1869 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl, 1870 InsMap, ClsMap, I); 1871 // Check class extensions (unnamed categories) 1872 for (ObjCInterfaceDecl::visible_extensions_iterator 1873 Ext = I->visible_extensions_begin(), 1874 ExtEnd = I->visible_extensions_end(); 1875 Ext != ExtEnd; ++Ext) { 1876 ImplMethodsVsClassMethods(S, IMPDecl, *Ext, IncompleteImpl); 1877 } 1878 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl)) { 1879 // For extended class, unimplemented methods in its protocols will 1880 // be reported in the primary class. 1881 if (!C->IsClassExtension()) { 1882 for (ObjCCategoryDecl::protocol_iterator PI = C->protocol_begin(), 1883 E = C->protocol_end(); PI != E; ++PI) 1884 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl, 1885 InsMap, ClsMap, CDecl); 1886 DiagnoseUnimplementedProperties(S, IMPDecl, CDecl); 1887 } 1888 } else 1889 llvm_unreachable("invalid ObjCContainerDecl type."); 1890} 1891 1892/// ActOnForwardClassDeclaration - 1893Sema::DeclGroupPtrTy 1894Sema::ActOnForwardClassDeclaration(SourceLocation AtClassLoc, 1895 IdentifierInfo **IdentList, 1896 SourceLocation *IdentLocs, 1897 unsigned NumElts) { 1898 SmallVector<Decl *, 8> DeclsInGroup; 1899 for (unsigned i = 0; i != NumElts; ++i) { 1900 // Check for another declaration kind with the same name. 1901 NamedDecl *PrevDecl 1902 = LookupSingleName(TUScope, IdentList[i], IdentLocs[i], 1903 LookupOrdinaryName, ForRedeclaration); 1904 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1905 // Maybe we will complain about the shadowed template parameter. 1906 DiagnoseTemplateParameterShadow(AtClassLoc, PrevDecl); 1907 // Just pretend that we didn't see the previous declaration. 1908 PrevDecl = 0; 1909 } 1910 1911 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 1912 // GCC apparently allows the following idiom: 1913 // 1914 // typedef NSObject < XCElementTogglerP > XCElementToggler; 1915 // @class XCElementToggler; 1916 // 1917 // Here we have chosen to ignore the forward class declaration 1918 // with a warning. Since this is the implied behavior. 1919 TypedefNameDecl *TDD = dyn_cast<TypedefNameDecl>(PrevDecl); 1920 if (!TDD || !TDD->getUnderlyingType()->isObjCObjectType()) { 1921 Diag(AtClassLoc, diag::err_redefinition_different_kind) << IdentList[i]; 1922 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1923 } else { 1924 // a forward class declaration matching a typedef name of a class refers 1925 // to the underlying class. Just ignore the forward class with a warning 1926 // as this will force the intended behavior which is to lookup the typedef 1927 // name. 1928 if (isa<ObjCObjectType>(TDD->getUnderlyingType())) { 1929 Diag(AtClassLoc, diag::warn_forward_class_redefinition) << IdentList[i]; 1930 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1931 continue; 1932 } 1933 } 1934 } 1935 1936 // Create a declaration to describe this forward declaration. 1937 ObjCInterfaceDecl *PrevIDecl 1938 = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 1939 ObjCInterfaceDecl *IDecl 1940 = ObjCInterfaceDecl::Create(Context, CurContext, AtClassLoc, 1941 IdentList[i], PrevIDecl, IdentLocs[i]); 1942 IDecl->setAtEndRange(IdentLocs[i]); 1943 1944 PushOnScopeChains(IDecl, TUScope); 1945 CheckObjCDeclScope(IDecl); 1946 DeclsInGroup.push_back(IDecl); 1947 } 1948 1949 return BuildDeclaratorGroup(DeclsInGroup.data(), DeclsInGroup.size(), false); 1950} 1951 1952static bool tryMatchRecordTypes(ASTContext &Context, 1953 Sema::MethodMatchStrategy strategy, 1954 const Type *left, const Type *right); 1955 1956static bool matchTypes(ASTContext &Context, Sema::MethodMatchStrategy strategy, 1957 QualType leftQT, QualType rightQT) { 1958 const Type *left = 1959 Context.getCanonicalType(leftQT).getUnqualifiedType().getTypePtr(); 1960 const Type *right = 1961 Context.getCanonicalType(rightQT).getUnqualifiedType().getTypePtr(); 1962 1963 if (left == right) return true; 1964 1965 // If we're doing a strict match, the types have to match exactly. 1966 if (strategy == Sema::MMS_strict) return false; 1967 1968 if (left->isIncompleteType() || right->isIncompleteType()) return false; 1969 1970 // Otherwise, use this absurdly complicated algorithm to try to 1971 // validate the basic, low-level compatibility of the two types. 1972 1973 // As a minimum, require the sizes and alignments to match. 1974 if (Context.getTypeInfo(left) != Context.getTypeInfo(right)) 1975 return false; 1976 1977 // Consider all the kinds of non-dependent canonical types: 1978 // - functions and arrays aren't possible as return and parameter types 1979 1980 // - vector types of equal size can be arbitrarily mixed 1981 if (isa<VectorType>(left)) return isa<VectorType>(right); 1982 if (isa<VectorType>(right)) return false; 1983 1984 // - references should only match references of identical type 1985 // - structs, unions, and Objective-C objects must match more-or-less 1986 // exactly 1987 // - everything else should be a scalar 1988 if (!left->isScalarType() || !right->isScalarType()) 1989 return tryMatchRecordTypes(Context, strategy, left, right); 1990 1991 // Make scalars agree in kind, except count bools as chars, and group 1992 // all non-member pointers together. 1993 Type::ScalarTypeKind leftSK = left->getScalarTypeKind(); 1994 Type::ScalarTypeKind rightSK = right->getScalarTypeKind(); 1995 if (leftSK == Type::STK_Bool) leftSK = Type::STK_Integral; 1996 if (rightSK == Type::STK_Bool) rightSK = Type::STK_Integral; 1997 if (leftSK == Type::STK_CPointer || leftSK == Type::STK_BlockPointer) 1998 leftSK = Type::STK_ObjCObjectPointer; 1999 if (rightSK == Type::STK_CPointer || rightSK == Type::STK_BlockPointer) 2000 rightSK = Type::STK_ObjCObjectPointer; 2001 2002 // Note that data member pointers and function member pointers don't 2003 // intermix because of the size differences. 2004 2005 return (leftSK == rightSK); 2006} 2007 2008static bool tryMatchRecordTypes(ASTContext &Context, 2009 Sema::MethodMatchStrategy strategy, 2010 const Type *lt, const Type *rt) { 2011 assert(lt && rt && lt != rt); 2012 2013 if (!isa<RecordType>(lt) || !isa<RecordType>(rt)) return false; 2014 RecordDecl *left = cast<RecordType>(lt)->getDecl(); 2015 RecordDecl *right = cast<RecordType>(rt)->getDecl(); 2016 2017 // Require union-hood to match. 2018 if (left->isUnion() != right->isUnion()) return false; 2019 2020 // Require an exact match if either is non-POD. 2021 if ((isa<CXXRecordDecl>(left) && !cast<CXXRecordDecl>(left)->isPOD()) || 2022 (isa<CXXRecordDecl>(right) && !cast<CXXRecordDecl>(right)->isPOD())) 2023 return false; 2024 2025 // Require size and alignment to match. 2026 if (Context.getTypeInfo(lt) != Context.getTypeInfo(rt)) return false; 2027 2028 // Require fields to match. 2029 RecordDecl::field_iterator li = left->field_begin(), le = left->field_end(); 2030 RecordDecl::field_iterator ri = right->field_begin(), re = right->field_end(); 2031 for (; li != le && ri != re; ++li, ++ri) { 2032 if (!matchTypes(Context, strategy, li->getType(), ri->getType())) 2033 return false; 2034 } 2035 return (li == le && ri == re); 2036} 2037 2038/// MatchTwoMethodDeclarations - Checks that two methods have matching type and 2039/// returns true, or false, accordingly. 2040/// TODO: Handle protocol list; such as id<p1,p2> in type comparisons 2041bool Sema::MatchTwoMethodDeclarations(const ObjCMethodDecl *left, 2042 const ObjCMethodDecl *right, 2043 MethodMatchStrategy strategy) { 2044 if (!matchTypes(Context, strategy, 2045 left->getResultType(), right->getResultType())) 2046 return false; 2047 2048 // If either is hidden, it is not considered to match. 2049 if (left->isHidden() || right->isHidden()) 2050 return false; 2051 2052 if (getLangOpts().ObjCAutoRefCount && 2053 (left->hasAttr<NSReturnsRetainedAttr>() 2054 != right->hasAttr<NSReturnsRetainedAttr>() || 2055 left->hasAttr<NSConsumesSelfAttr>() 2056 != right->hasAttr<NSConsumesSelfAttr>())) 2057 return false; 2058 2059 ObjCMethodDecl::param_const_iterator 2060 li = left->param_begin(), le = left->param_end(), ri = right->param_begin(), 2061 re = right->param_end(); 2062 2063 for (; li != le && ri != re; ++li, ++ri) { 2064 assert(ri != right->param_end() && "Param mismatch"); 2065 const ParmVarDecl *lparm = *li, *rparm = *ri; 2066 2067 if (!matchTypes(Context, strategy, lparm->getType(), rparm->getType())) 2068 return false; 2069 2070 if (getLangOpts().ObjCAutoRefCount && 2071 lparm->hasAttr<NSConsumedAttr>() != rparm->hasAttr<NSConsumedAttr>()) 2072 return false; 2073 } 2074 return true; 2075} 2076 2077void Sema::addMethodToGlobalList(ObjCMethodList *List, ObjCMethodDecl *Method) { 2078 // Record at the head of the list whether there were 0, 1, or >= 2 methods 2079 // inside categories. 2080 if (ObjCCategoryDecl * 2081 CD = dyn_cast<ObjCCategoryDecl>(Method->getDeclContext())) 2082 if (!CD->IsClassExtension() && List->getBits() < 2) 2083 List->setBits(List->getBits()+1); 2084 2085 // If the list is empty, make it a singleton list. 2086 if (List->Method == 0) { 2087 List->Method = Method; 2088 List->setNext(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->getNext()) { 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->setNext(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->getNext()) { 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 (!hasOverriddenMethodsInBaseOrProtocol) { 2804 if (isa<ObjCProtocolDecl>(overridden->getDeclContext()) || 2805 CurrentClass != overridden->getClassInterface() || 2806 overridden->isOverriding()) { 2807 hasOverriddenMethodsInBaseOrProtocol = true; 2808 2809 } else if (isa<ObjCImplDecl>(ObjCMethod->getDeclContext())) { 2810 // OverrideSearch will return as "overridden" the same method in the 2811 // interface. For hasOverriddenMethodsInBaseOrProtocol, we need to 2812 // check whether a category of a base class introduced a method with the 2813 // same selector, after the interface method declaration. 2814 // To avoid unnecessary lookups in the majority of cases, we use the 2815 // extra info bits in GlobalMethodPool to check whether there were any 2816 // category methods with this selector. 2817 GlobalMethodPool::iterator It = 2818 MethodPool.find(ObjCMethod->getSelector()); 2819 if (It != MethodPool.end()) { 2820 ObjCMethodList &List = 2821 ObjCMethod->isInstanceMethod()? It->second.first: It->second.second; 2822 unsigned CategCount = List.getBits(); 2823 if (CategCount > 0) { 2824 // If the method is in a category we'll do lookup if there were at 2825 // least 2 category methods recorded, otherwise only one will do. 2826 if (CategCount > 1 || 2827 !isa<ObjCCategoryImplDecl>(overridden->getDeclContext())) { 2828 OverrideSearch overrides(*this, overridden); 2829 for (OverrideSearch::iterator 2830 OI= overrides.begin(), OE= overrides.end(); OI!=OE; ++OI) { 2831 ObjCMethodDecl *SuperOverridden = *OI; 2832 if (isa<ObjCProtocolDecl>(SuperOverridden->getDeclContext()) || 2833 CurrentClass != SuperOverridden->getClassInterface()) { 2834 hasOverriddenMethodsInBaseOrProtocol = true; 2835 overridden->setOverriding(true); 2836 break; 2837 } 2838 } 2839 } 2840 } 2841 } 2842 } 2843 } 2844 2845 // Propagate down the 'related result type' bit from overridden methods. 2846 if (RTC != Sema::RTC_Incompatible && overridden->hasRelatedResultType()) 2847 ObjCMethod->SetRelatedResultType(); 2848 2849 // Then merge the declarations. 2850 mergeObjCMethodDecls(ObjCMethod, overridden); 2851 2852 if (ObjCMethod->isImplicit() && overridden->isImplicit()) 2853 continue; // Conflicting properties are detected elsewhere. 2854 2855 // Check for overriding methods 2856 if (isa<ObjCInterfaceDecl>(ObjCMethod->getDeclContext()) || 2857 isa<ObjCImplementationDecl>(ObjCMethod->getDeclContext())) 2858 CheckConflictingOverridingMethod(ObjCMethod, overridden, 2859 isa<ObjCProtocolDecl>(overridden->getDeclContext())); 2860 2861 if (CurrentClass && overridden->getDeclContext() != CurrentClass && 2862 isa<ObjCInterfaceDecl>(overridden->getDeclContext()) && 2863 !overridden->isImplicit() /* not meant for properties */) { 2864 ObjCMethodDecl::param_iterator ParamI = ObjCMethod->param_begin(), 2865 E = ObjCMethod->param_end(); 2866 ObjCMethodDecl::param_iterator PrevI = overridden->param_begin(), 2867 PrevE = overridden->param_end(); 2868 for (; ParamI != E && PrevI != PrevE; ++ParamI, ++PrevI) { 2869 assert(PrevI != overridden->param_end() && "Param mismatch"); 2870 QualType T1 = Context.getCanonicalType((*ParamI)->getType()); 2871 QualType T2 = Context.getCanonicalType((*PrevI)->getType()); 2872 // If type of argument of method in this class does not match its 2873 // respective argument type in the super class method, issue warning; 2874 if (!Context.typesAreCompatible(T1, T2)) { 2875 Diag((*ParamI)->getLocation(), diag::ext_typecheck_base_super) 2876 << T1 << T2; 2877 Diag(overridden->getLocation(), diag::note_previous_declaration); 2878 break; 2879 } 2880 } 2881 } 2882 } 2883 2884 ObjCMethod->setOverriding(hasOverriddenMethodsInBaseOrProtocol); 2885} 2886 2887Decl *Sema::ActOnMethodDeclaration( 2888 Scope *S, 2889 SourceLocation MethodLoc, SourceLocation EndLoc, 2890 tok::TokenKind MethodType, 2891 ObjCDeclSpec &ReturnQT, ParsedType ReturnType, 2892 ArrayRef<SourceLocation> SelectorLocs, 2893 Selector Sel, 2894 // optional arguments. The number of types/arguments is obtained 2895 // from the Sel.getNumArgs(). 2896 ObjCArgInfo *ArgInfo, 2897 DeclaratorChunk::ParamInfo *CParamInfo, unsigned CNumArgs, // c-style args 2898 AttributeList *AttrList, tok::ObjCKeywordKind MethodDeclKind, 2899 bool isVariadic, bool MethodDefinition) { 2900 // Make sure we can establish a context for the method. 2901 if (!CurContext->isObjCContainer()) { 2902 Diag(MethodLoc, diag::error_missing_method_context); 2903 return 0; 2904 } 2905 ObjCContainerDecl *OCD = dyn_cast<ObjCContainerDecl>(CurContext); 2906 Decl *ClassDecl = cast<Decl>(OCD); 2907 QualType resultDeclType; 2908 2909 bool HasRelatedResultType = false; 2910 TypeSourceInfo *ResultTInfo = 0; 2911 if (ReturnType) { 2912 resultDeclType = GetTypeFromParser(ReturnType, &ResultTInfo); 2913 2914 // Methods cannot return interface types. All ObjC objects are 2915 // passed by reference. 2916 if (resultDeclType->isObjCObjectType()) { 2917 Diag(MethodLoc, diag::err_object_cannot_be_passed_returned_by_value) 2918 << 0 << resultDeclType; 2919 return 0; 2920 } 2921 2922 HasRelatedResultType = (resultDeclType == Context.getObjCInstanceType()); 2923 } else { // get the type for "id". 2924 resultDeclType = Context.getObjCIdType(); 2925 Diag(MethodLoc, diag::warn_missing_method_return_type) 2926 << FixItHint::CreateInsertion(SelectorLocs.front(), "(id)"); 2927 } 2928 2929 ObjCMethodDecl* ObjCMethod = 2930 ObjCMethodDecl::Create(Context, MethodLoc, EndLoc, Sel, 2931 resultDeclType, 2932 ResultTInfo, 2933 CurContext, 2934 MethodType == tok::minus, isVariadic, 2935 /*isPropertyAccessor=*/false, 2936 /*isImplicitlyDeclared=*/false, /*isDefined=*/false, 2937 MethodDeclKind == tok::objc_optional 2938 ? ObjCMethodDecl::Optional 2939 : ObjCMethodDecl::Required, 2940 HasRelatedResultType); 2941 2942 SmallVector<ParmVarDecl*, 16> Params; 2943 2944 for (unsigned i = 0, e = Sel.getNumArgs(); i != e; ++i) { 2945 QualType ArgType; 2946 TypeSourceInfo *DI; 2947 2948 if (ArgInfo[i].Type == 0) { 2949 ArgType = Context.getObjCIdType(); 2950 DI = 0; 2951 } else { 2952 ArgType = GetTypeFromParser(ArgInfo[i].Type, &DI); 2953 } 2954 2955 LookupResult R(*this, ArgInfo[i].Name, ArgInfo[i].NameLoc, 2956 LookupOrdinaryName, ForRedeclaration); 2957 LookupName(R, S); 2958 if (R.isSingleResult()) { 2959 NamedDecl *PrevDecl = R.getFoundDecl(); 2960 if (S->isDeclScope(PrevDecl)) { 2961 Diag(ArgInfo[i].NameLoc, 2962 (MethodDefinition ? diag::warn_method_param_redefinition 2963 : diag::warn_method_param_declaration)) 2964 << ArgInfo[i].Name; 2965 Diag(PrevDecl->getLocation(), 2966 diag::note_previous_declaration); 2967 } 2968 } 2969 2970 SourceLocation StartLoc = DI 2971 ? DI->getTypeLoc().getBeginLoc() 2972 : ArgInfo[i].NameLoc; 2973 2974 ParmVarDecl* Param = CheckParameter(ObjCMethod, StartLoc, 2975 ArgInfo[i].NameLoc, ArgInfo[i].Name, 2976 ArgType, DI, SC_None); 2977 2978 Param->setObjCMethodScopeInfo(i); 2979 2980 Param->setObjCDeclQualifier( 2981 CvtQTToAstBitMask(ArgInfo[i].DeclSpec.getObjCDeclQualifier())); 2982 2983 // Apply the attributes to the parameter. 2984 ProcessDeclAttributeList(TUScope, Param, ArgInfo[i].ArgAttrs); 2985 2986 if (Param->hasAttr<BlocksAttr>()) { 2987 Diag(Param->getLocation(), diag::err_block_on_nonlocal); 2988 Param->setInvalidDecl(); 2989 } 2990 S->AddDecl(Param); 2991 IdResolver.AddDecl(Param); 2992 2993 Params.push_back(Param); 2994 } 2995 2996 for (unsigned i = 0, e = CNumArgs; i != e; ++i) { 2997 ParmVarDecl *Param = cast<ParmVarDecl>(CParamInfo[i].Param); 2998 QualType ArgType = Param->getType(); 2999 if (ArgType.isNull()) 3000 ArgType = Context.getObjCIdType(); 3001 else 3002 // Perform the default array/function conversions (C99 6.7.5.3p[7,8]). 3003 ArgType = Context.getAdjustedParameterType(ArgType); 3004 if (ArgType->isObjCObjectType()) { 3005 Diag(Param->getLocation(), 3006 diag::err_object_cannot_be_passed_returned_by_value) 3007 << 1 << ArgType; 3008 Param->setInvalidDecl(); 3009 } 3010 Param->setDeclContext(ObjCMethod); 3011 3012 Params.push_back(Param); 3013 } 3014 3015 ObjCMethod->setMethodParams(Context, Params, SelectorLocs); 3016 ObjCMethod->setObjCDeclQualifier( 3017 CvtQTToAstBitMask(ReturnQT.getObjCDeclQualifier())); 3018 3019 if (AttrList) 3020 ProcessDeclAttributeList(TUScope, ObjCMethod, AttrList); 3021 3022 // Add the method now. 3023 const ObjCMethodDecl *PrevMethod = 0; 3024 if (ObjCImplDecl *ImpDecl = dyn_cast<ObjCImplDecl>(ClassDecl)) { 3025 if (MethodType == tok::minus) { 3026 PrevMethod = ImpDecl->getInstanceMethod(Sel); 3027 ImpDecl->addInstanceMethod(ObjCMethod); 3028 } else { 3029 PrevMethod = ImpDecl->getClassMethod(Sel); 3030 ImpDecl->addClassMethod(ObjCMethod); 3031 } 3032 3033 ObjCMethodDecl *IMD = 0; 3034 if (ObjCInterfaceDecl *IDecl = ImpDecl->getClassInterface()) 3035 IMD = IDecl->lookupMethod(ObjCMethod->getSelector(), 3036 ObjCMethod->isInstanceMethod()); 3037 if (ObjCMethod->hasAttrs() && 3038 containsInvalidMethodImplAttribute(IMD, ObjCMethod->getAttrs())) { 3039 SourceLocation MethodLoc = IMD->getLocation(); 3040 if (!getSourceManager().isInSystemHeader(MethodLoc)) { 3041 Diag(EndLoc, diag::warn_attribute_method_def); 3042 Diag(MethodLoc, diag::note_method_declared_at) 3043 << ObjCMethod->getDeclName(); 3044 } 3045 } 3046 } else { 3047 cast<DeclContext>(ClassDecl)->addDecl(ObjCMethod); 3048 } 3049 3050 if (PrevMethod) { 3051 // You can never have two method definitions with the same name. 3052 Diag(ObjCMethod->getLocation(), diag::err_duplicate_method_decl) 3053 << ObjCMethod->getDeclName(); 3054 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 3055 } 3056 3057 // If this Objective-C method does not have a related result type, but we 3058 // are allowed to infer related result types, try to do so based on the 3059 // method family. 3060 ObjCInterfaceDecl *CurrentClass = dyn_cast<ObjCInterfaceDecl>(ClassDecl); 3061 if (!CurrentClass) { 3062 if (ObjCCategoryDecl *Cat = dyn_cast<ObjCCategoryDecl>(ClassDecl)) 3063 CurrentClass = Cat->getClassInterface(); 3064 else if (ObjCImplDecl *Impl = dyn_cast<ObjCImplDecl>(ClassDecl)) 3065 CurrentClass = Impl->getClassInterface(); 3066 else if (ObjCCategoryImplDecl *CatImpl 3067 = dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) 3068 CurrentClass = CatImpl->getClassInterface(); 3069 } 3070 3071 ResultTypeCompatibilityKind RTC 3072 = CheckRelatedResultTypeCompatibility(*this, ObjCMethod, CurrentClass); 3073 3074 CheckObjCMethodOverrides(ObjCMethod, CurrentClass, RTC); 3075 3076 bool ARCError = false; 3077 if (getLangOpts().ObjCAutoRefCount) 3078 ARCError = CheckARCMethodDecl(ObjCMethod); 3079 3080 // Infer the related result type when possible. 3081 if (!ARCError && RTC == Sema::RTC_Compatible && 3082 !ObjCMethod->hasRelatedResultType() && 3083 LangOpts.ObjCInferRelatedResultType) { 3084 bool InferRelatedResultType = false; 3085 switch (ObjCMethod->getMethodFamily()) { 3086 case OMF_None: 3087 case OMF_copy: 3088 case OMF_dealloc: 3089 case OMF_finalize: 3090 case OMF_mutableCopy: 3091 case OMF_release: 3092 case OMF_retainCount: 3093 case OMF_performSelector: 3094 break; 3095 3096 case OMF_alloc: 3097 case OMF_new: 3098 InferRelatedResultType = ObjCMethod->isClassMethod(); 3099 break; 3100 3101 case OMF_init: 3102 case OMF_autorelease: 3103 case OMF_retain: 3104 case OMF_self: 3105 InferRelatedResultType = ObjCMethod->isInstanceMethod(); 3106 break; 3107 } 3108 3109 if (InferRelatedResultType) 3110 ObjCMethod->SetRelatedResultType(); 3111 } 3112 3113 ActOnDocumentableDecl(ObjCMethod); 3114 3115 return ObjCMethod; 3116} 3117 3118bool Sema::CheckObjCDeclScope(Decl *D) { 3119 // Following is also an error. But it is caused by a missing @end 3120 // and diagnostic is issued elsewhere. 3121 if (isa<ObjCContainerDecl>(CurContext->getRedeclContext())) 3122 return false; 3123 3124 // If we switched context to translation unit while we are still lexically in 3125 // an objc container, it means the parser missed emitting an error. 3126 if (isa<TranslationUnitDecl>(getCurLexicalContext()->getRedeclContext())) 3127 return false; 3128 3129 Diag(D->getLocation(), diag::err_objc_decls_may_only_appear_in_global_scope); 3130 D->setInvalidDecl(); 3131 3132 return true; 3133} 3134 3135/// Called whenever \@defs(ClassName) is encountered in the source. Inserts the 3136/// instance variables of ClassName into Decls. 3137void Sema::ActOnDefs(Scope *S, Decl *TagD, SourceLocation DeclStart, 3138 IdentifierInfo *ClassName, 3139 SmallVectorImpl<Decl*> &Decls) { 3140 // Check that ClassName is a valid class 3141 ObjCInterfaceDecl *Class = getObjCInterfaceDecl(ClassName, DeclStart); 3142 if (!Class) { 3143 Diag(DeclStart, diag::err_undef_interface) << ClassName; 3144 return; 3145 } 3146 if (LangOpts.ObjCRuntime.isNonFragile()) { 3147 Diag(DeclStart, diag::err_atdef_nonfragile_interface); 3148 return; 3149 } 3150 3151 // Collect the instance variables 3152 SmallVector<const ObjCIvarDecl*, 32> Ivars; 3153 Context.DeepCollectObjCIvars(Class, true, Ivars); 3154 // For each ivar, create a fresh ObjCAtDefsFieldDecl. 3155 for (unsigned i = 0; i < Ivars.size(); i++) { 3156 const FieldDecl* ID = cast<FieldDecl>(Ivars[i]); 3157 RecordDecl *Record = dyn_cast<RecordDecl>(TagD); 3158 Decl *FD = ObjCAtDefsFieldDecl::Create(Context, Record, 3159 /*FIXME: StartL=*/ID->getLocation(), 3160 ID->getLocation(), 3161 ID->getIdentifier(), ID->getType(), 3162 ID->getBitWidth()); 3163 Decls.push_back(FD); 3164 } 3165 3166 // Introduce all of these fields into the appropriate scope. 3167 for (SmallVectorImpl<Decl*>::iterator D = Decls.begin(); 3168 D != Decls.end(); ++D) { 3169 FieldDecl *FD = cast<FieldDecl>(*D); 3170 if (getLangOpts().CPlusPlus) 3171 PushOnScopeChains(cast<FieldDecl>(FD), S); 3172 else if (RecordDecl *Record = dyn_cast<RecordDecl>(TagD)) 3173 Record->addDecl(FD); 3174 } 3175} 3176 3177/// \brief Build a type-check a new Objective-C exception variable declaration. 3178VarDecl *Sema::BuildObjCExceptionDecl(TypeSourceInfo *TInfo, QualType T, 3179 SourceLocation StartLoc, 3180 SourceLocation IdLoc, 3181 IdentifierInfo *Id, 3182 bool Invalid) { 3183 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 3184 // duration shall not be qualified by an address-space qualifier." 3185 // Since all parameters have automatic store duration, they can not have 3186 // an address space. 3187 if (T.getAddressSpace() != 0) { 3188 Diag(IdLoc, diag::err_arg_with_address_space); 3189 Invalid = true; 3190 } 3191 3192 // An @catch parameter must be an unqualified object pointer type; 3193 // FIXME: Recover from "NSObject foo" by inserting the * in "NSObject *foo"? 3194 if (Invalid) { 3195 // Don't do any further checking. 3196 } else if (T->isDependentType()) { 3197 // Okay: we don't know what this type will instantiate to. 3198 } else if (!T->isObjCObjectPointerType()) { 3199 Invalid = true; 3200 Diag(IdLoc ,diag::err_catch_param_not_objc_type); 3201 } else if (T->isObjCQualifiedIdType()) { 3202 Invalid = true; 3203 Diag(IdLoc, diag::err_illegal_qualifiers_on_catch_parm); 3204 } 3205 3206 VarDecl *New = VarDecl::Create(Context, CurContext, StartLoc, IdLoc, Id, 3207 T, TInfo, SC_None); 3208 New->setExceptionVariable(true); 3209 3210 // In ARC, infer 'retaining' for variables of retainable type. 3211 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(New)) 3212 Invalid = true; 3213 3214 if (Invalid) 3215 New->setInvalidDecl(); 3216 return New; 3217} 3218 3219Decl *Sema::ActOnObjCExceptionDecl(Scope *S, Declarator &D) { 3220 const DeclSpec &DS = D.getDeclSpec(); 3221 3222 // We allow the "register" storage class on exception variables because 3223 // GCC did, but we drop it completely. Any other storage class is an error. 3224 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 3225 Diag(DS.getStorageClassSpecLoc(), diag::warn_register_objc_catch_parm) 3226 << FixItHint::CreateRemoval(SourceRange(DS.getStorageClassSpecLoc())); 3227 } else if (DeclSpec::SCS SCS = DS.getStorageClassSpec()) { 3228 Diag(DS.getStorageClassSpecLoc(), diag::err_storage_spec_on_catch_parm) 3229 << DeclSpec::getSpecifierName(SCS); 3230 } 3231 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec()) 3232 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(), 3233 diag::err_invalid_thread) 3234 << DeclSpec::getSpecifierName(TSCS); 3235 D.getMutableDeclSpec().ClearStorageClassSpecs(); 3236 3237 DiagnoseFunctionSpecifiers(D.getDeclSpec()); 3238 3239 // Check that there are no default arguments inside the type of this 3240 // exception object (C++ only). 3241 if (getLangOpts().CPlusPlus) 3242 CheckExtraCXXDefaultArguments(D); 3243 3244 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3245 QualType ExceptionType = TInfo->getType(); 3246 3247 VarDecl *New = BuildObjCExceptionDecl(TInfo, ExceptionType, 3248 D.getSourceRange().getBegin(), 3249 D.getIdentifierLoc(), 3250 D.getIdentifier(), 3251 D.isInvalidType()); 3252 3253 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 3254 if (D.getCXXScopeSpec().isSet()) { 3255 Diag(D.getIdentifierLoc(), diag::err_qualified_objc_catch_parm) 3256 << D.getCXXScopeSpec().getRange(); 3257 New->setInvalidDecl(); 3258 } 3259 3260 // Add the parameter declaration into this scope. 3261 S->AddDecl(New); 3262 if (D.getIdentifier()) 3263 IdResolver.AddDecl(New); 3264 3265 ProcessDeclAttributes(S, New, D); 3266 3267 if (New->hasAttr<BlocksAttr>()) 3268 Diag(New->getLocation(), diag::err_block_on_nonlocal); 3269 return New; 3270} 3271 3272/// CollectIvarsToConstructOrDestruct - Collect those ivars which require 3273/// initialization. 3274void Sema::CollectIvarsToConstructOrDestruct(ObjCInterfaceDecl *OI, 3275 SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 3276 for (ObjCIvarDecl *Iv = OI->all_declared_ivar_begin(); Iv; 3277 Iv= Iv->getNextIvar()) { 3278 QualType QT = Context.getBaseElementType(Iv->getType()); 3279 if (QT->isRecordType()) 3280 Ivars.push_back(Iv); 3281 } 3282} 3283 3284void Sema::DiagnoseUseOfUnimplementedSelectors() { 3285 // Load referenced selectors from the external source. 3286 if (ExternalSource) { 3287 SmallVector<std::pair<Selector, SourceLocation>, 4> Sels; 3288 ExternalSource->ReadReferencedSelectors(Sels); 3289 for (unsigned I = 0, N = Sels.size(); I != N; ++I) 3290 ReferencedSelectors[Sels[I].first] = Sels[I].second; 3291 } 3292 3293 // Warning will be issued only when selector table is 3294 // generated (which means there is at lease one implementation 3295 // in the TU). This is to match gcc's behavior. 3296 if (ReferencedSelectors.empty() || 3297 !Context.AnyObjCImplementation()) 3298 return; 3299 for (llvm::DenseMap<Selector, SourceLocation>::iterator S = 3300 ReferencedSelectors.begin(), 3301 E = ReferencedSelectors.end(); S != E; ++S) { 3302 Selector Sel = (*S).first; 3303 if (!LookupImplementedMethodInGlobalPool(Sel)) 3304 Diag((*S).second, diag::warn_unimplemented_selector) << Sel; 3305 } 3306 return; 3307} 3308