SemaDeclObjC.cpp revision da92a7f91cf88f49e02050919676f7fb8e3bdff8
1402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski//===--- SemaDeclObjC.cpp - Semantic Analysis for ObjC Declarations -------===// 2402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski// 3402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski// The LLVM Compiler Infrastructure 4402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski// 5402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski// This file is distributed under the University of Illinois Open Source 6402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski// License. See LICENSE.TXT for details. 7402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski// 8402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski//===----------------------------------------------------------------------===// 9402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski// 10402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski// This file implements semantic analysis for Objective C declarations. 11402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski// 12402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski//===----------------------------------------------------------------------===// 13402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski 1419903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski#include "clang/Sema/SemaInternal.h" 1519903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski#include "clang/Sema/Lookup.h" 16402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski#include "clang/Sema/ExternalSemaSource.h" 17402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski#include "clang/Sema/Scope.h" 18402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski#include "clang/Sema/ScopeInfo.h" 19402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski#include "clang/AST/ASTConsumer.h" 20402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski#include "clang/AST/Expr.h" 21402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski#include "clang/AST/ExprObjC.h" 22d5b16055782034ca90153880c36bd88b59c63aa0Caitlin Sadowski#include "clang/AST/ASTContext.h" 23402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski#include "clang/AST/DeclObjC.h" 24402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski#include "clang/Basic/SourceManager.h" 25402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski#include "clang/Sema/DeclSpec.h" 26402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski#include "llvm/ADT/DenseSet.h" 27402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski 28402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowskiusing namespace clang; 2919903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski 3019903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski/// Check whether the given method, which must be in the 'init' 31402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski/// family, is a valid member of that family. 32b50dd472cd6c8b13213626f13a928dbe41581f09Caitlin Sadowski/// 33b50dd472cd6c8b13213626f13a928dbe41581f09Caitlin Sadowski/// \param receiverTypeIfCall - if null, check this as if declaring it; 34b50dd472cd6c8b13213626f13a928dbe41581f09Caitlin Sadowski/// if non-null, check this as if making a call to it with the given 35402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski/// receiver type 36402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski/// 3719903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski/// \return true to indicate that there was an error and appropriate 3819903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski/// actions were taken 3919903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowskibool Sema::checkInitMethod(ObjCMethodDecl *method, 40402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski QualType receiverTypeIfCall) { 41b50dd472cd6c8b13213626f13a928dbe41581f09Caitlin Sadowski if (method->isInvalidDecl()) return true; 42b50dd472cd6c8b13213626f13a928dbe41581f09Caitlin Sadowski 43402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski // This castAs is safe: methods that don't return an object 44402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski // pointer won't be inferred as inits and will reject an explicit 4519903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski // objc_method_family(init). 4619903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski 47402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski // We ignore protocols here. Should we? What about Class? 48b50dd472cd6c8b13213626f13a928dbe41581f09Caitlin Sadowski 49b50dd472cd6c8b13213626f13a928dbe41581f09Caitlin Sadowski const ObjCObjectType *result = method->getResultType() 50402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski ->castAs<ObjCObjectPointerType>()->getObjectType(); 51402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski 524e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski if (result->isObjCId()) { 534e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski return false; 544e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski } else if (result->isObjCClass()) { 554e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski // fall through: always an error 564e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski } else { 574e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski ObjCInterfaceDecl *resultClass = result->getInterface(); 584e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski assert(resultClass && "unexpected object type!"); 594e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski 604e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski // It's okay for the result type to still be a forward declaration 614e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski // if we're checking an interface declaration. 624e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski if (resultClass->isForwardDecl()) { 634e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski if (receiverTypeIfCall.isNull() && 644e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski !isa<ObjCImplementationDecl>(method->getDeclContext())) 654e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski return false; 6619903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski 67402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski // Otherwise, we try to compare class types. 68402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski } else { 69402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski // If this method was declared in a protocol, we can't check 709f80a97408ee0da939654d851ff42ad07d47e9c7DeLesley Hutchins // anything unless we have a receiver type that's an interface. 7119903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski const ObjCInterfaceDecl *receiverClass = 0; 7219903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski if (isa<ObjCProtocolDecl>(method->getDeclContext())) { 7319903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski if (receiverTypeIfCall.isNull()) 7499107ebc0a5aea953b736e12757e0919d5249d43Caitlin Sadowski return false; 7519903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski 7619903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski receiverClass = receiverTypeIfCall->castAs<ObjCObjectPointerType>() 7719903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski ->getInterfaceDecl(); 7819903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski 7919903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski // This can be null for calls to e.g. id<Foo>. 8019903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski if (!receiverClass) return false; 81402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski } else { 8219903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski receiverClass = method->getClassInterface(); 8319903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski assert(receiverClass && "method not associated with a class!"); 8419903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski } 8519903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski 86b50dd472cd6c8b13213626f13a928dbe41581f09Caitlin Sadowski // If either class is a subclass of the other, it's fine. 87402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski if (receiverClass->isSuperClassOf(resultClass) || 8819903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski resultClass->isSuperClassOf(receiverClass)) 8919903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski return false; 904e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski } 914e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski } 924e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski 934e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski SourceLocation loc = method->getLocation(); 9419903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski 9519903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski // If we're in a system header, and this is not a call, just make 964e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski // the method unusable. 974e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski if (receiverTypeIfCall.isNull() && getSourceManager().isInSystemHeader(loc)) { 984e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski method->addAttr(new (Context) UnavailableAttr(loc, Context, 994e4bc75d3570835e13183c66ac08974cdc016007Caitlin Sadowski "init method returns a type unrelated to its receiver type")); 10019903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski return true; 10119903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski } 10219903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski 10319903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski // Otherwise, it's an error. 10419903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski Diag(loc, diag::err_arc_init_method_unrelated_result_type); 10519903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski method->setInvalidDecl(); 106b50dd472cd6c8b13213626f13a928dbe41581f09Caitlin Sadowski return true; 107b50dd472cd6c8b13213626f13a928dbe41581f09Caitlin Sadowski} 108402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski 109402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowskivoid Sema::CheckObjCMethodOverride(ObjCMethodDecl *NewMethod, 11019903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski const ObjCMethodDecl *Overridden, 11119903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski bool IsImplementation) { 11219903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski if (Overridden->hasRelatedResultType() && 11319903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski !NewMethod->hasRelatedResultType()) { 11419903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski // This can only happen when the method follows a naming convention that 115b50dd472cd6c8b13213626f13a928dbe41581f09Caitlin Sadowski // implies a related result type, and the original (overridden) method has 116402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski // a suitable return type, but the new (overriding) method does not have 117402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski // a suitable return type. 11819903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski QualType ResultType = NewMethod->getResultType(); 11919903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski SourceRange ResultTypeRange; 12019903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski if (const TypeSourceInfo *ResultTypeInfo 12119903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski = NewMethod->getResultTypeSourceInfo()) 12219903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski ResultTypeRange = ResultTypeInfo->getTypeLoc().getSourceRange(); 12319903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski 12419903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski // Figure out which class this method is part of, if any. 12519903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski ObjCInterfaceDecl *CurrentClass 126b50dd472cd6c8b13213626f13a928dbe41581f09Caitlin Sadowski = dyn_cast<ObjCInterfaceDecl>(NewMethod->getDeclContext()); 127402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski if (!CurrentClass) { 128402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski DeclContext *DC = NewMethod->getDeclContext(); 129402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski if (ObjCCategoryDecl *Cat = dyn_cast<ObjCCategoryDecl>(DC)) 13019903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski CurrentClass = Cat->getClassInterface(); 13119903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski else if (ObjCImplDecl *Impl = dyn_cast<ObjCImplDecl>(DC)) 13219903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski CurrentClass = Impl->getClassInterface(); 13319903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski else if (ObjCCategoryImplDecl *CatImpl 13419903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski = dyn_cast<ObjCCategoryImplDecl>(DC)) 13519903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski CurrentClass = CatImpl->getClassInterface(); 136b50dd472cd6c8b13213626f13a928dbe41581f09Caitlin Sadowski } 137402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski 138402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski if (CurrentClass) { 139402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski Diag(NewMethod->getLocation(), 140402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski diag::warn_related_result_type_compatibility_class) 14119903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski << Context.getObjCInterfaceType(CurrentClass) 14219903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski << ResultType 14319903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski << ResultTypeRange; 14419903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski } else { 14519903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski Diag(NewMethod->getLocation(), 146402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski diag::warn_related_result_type_compatibility_protocol) 14719903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski << ResultType 14819903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski << ResultTypeRange; 14919903465e960329c0d5d93327f4046d036b0bc75Caitlin Sadowski } 150402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski 151402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski if (ObjCMethodFamily Family = Overridden->getMethodFamily()) 152402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski Diag(Overridden->getLocation(), 153402aa0698fec81e574818a0a6c2000fac0b2c4c6Caitlin Sadowski diag::note_related_result_type_overridden_family) 154 << Family; 155 else 156 Diag(Overridden->getLocation(), 157 diag::note_related_result_type_overridden); 158 } 159 if (getLangOptions().ObjCAutoRefCount) { 160 if ((NewMethod->hasAttr<NSReturnsRetainedAttr>() != 161 Overridden->hasAttr<NSReturnsRetainedAttr>())) { 162 Diag(NewMethod->getLocation(), 163 diag::err_nsreturns_retained_attribute_mismatch) << 1; 164 Diag(Overridden->getLocation(), diag::note_previous_decl) 165 << "method"; 166 } 167 if ((NewMethod->hasAttr<NSReturnsNotRetainedAttr>() != 168 Overridden->hasAttr<NSReturnsNotRetainedAttr>())) { 169 Diag(NewMethod->getLocation(), 170 diag::err_nsreturns_retained_attribute_mismatch) << 0; 171 Diag(Overridden->getLocation(), diag::note_previous_decl) 172 << "method"; 173 } 174 for (ObjCMethodDecl::param_iterator oi = Overridden->param_begin(), 175 ni = NewMethod->param_begin(), ne = NewMethod->param_end(); 176 ni != ne; ++ni, ++oi) { 177 ParmVarDecl *oldDecl = (*oi); 178 ParmVarDecl *newDecl = (*ni); 179 if (newDecl->hasAttr<NSConsumedAttr>() != 180 oldDecl->hasAttr<NSConsumedAttr>()) { 181 Diag(newDecl->getLocation(), 182 diag::err_nsconsumed_attribute_mismatch); 183 Diag(oldDecl->getLocation(), diag::note_previous_decl) 184 << "parameter"; 185 } 186 } 187 } 188} 189 190/// \brief Check a method declaration for compatibility with the Objective-C 191/// ARC conventions. 192static bool CheckARCMethodDecl(Sema &S, ObjCMethodDecl *method) { 193 ObjCMethodFamily family = method->getMethodFamily(); 194 switch (family) { 195 case OMF_None: 196 case OMF_dealloc: 197 case OMF_finalize: 198 case OMF_retain: 199 case OMF_release: 200 case OMF_autorelease: 201 case OMF_retainCount: 202 case OMF_self: 203 case OMF_performSelector: 204 return false; 205 206 case OMF_init: 207 // If the method doesn't obey the init rules, don't bother annotating it. 208 if (S.checkInitMethod(method, QualType())) 209 return true; 210 211 method->addAttr(new (S.Context) NSConsumesSelfAttr(SourceLocation(), 212 S.Context)); 213 214 // Don't add a second copy of this attribute, but otherwise don't 215 // let it be suppressed. 216 if (method->hasAttr<NSReturnsRetainedAttr>()) 217 return false; 218 break; 219 220 case OMF_alloc: 221 case OMF_copy: 222 case OMF_mutableCopy: 223 case OMF_new: 224 if (method->hasAttr<NSReturnsRetainedAttr>() || 225 method->hasAttr<NSReturnsNotRetainedAttr>() || 226 method->hasAttr<NSReturnsAutoreleasedAttr>()) 227 return false; 228 break; 229 } 230 231 method->addAttr(new (S.Context) NSReturnsRetainedAttr(SourceLocation(), 232 S.Context)); 233 return false; 234} 235 236static void DiagnoseObjCImplementedDeprecations(Sema &S, 237 NamedDecl *ND, 238 SourceLocation ImplLoc, 239 int select) { 240 if (ND && ND->isDeprecated()) { 241 S.Diag(ImplLoc, diag::warn_deprecated_def) << select; 242 if (select == 0) 243 S.Diag(ND->getLocation(), diag::note_method_declared_at); 244 else 245 S.Diag(ND->getLocation(), diag::note_previous_decl) << "class"; 246 } 247} 248 249/// AddAnyMethodToGlobalPool - Add any method, instance or factory to global 250/// pool. 251void Sema::AddAnyMethodToGlobalPool(Decl *D) { 252 ObjCMethodDecl *MDecl = dyn_cast_or_null<ObjCMethodDecl>(D); 253 254 // If we don't have a valid method decl, simply return. 255 if (!MDecl) 256 return; 257 if (MDecl->isInstanceMethod()) 258 AddInstanceMethodToGlobalPool(MDecl, true); 259 else 260 AddFactoryMethodToGlobalPool(MDecl, true); 261} 262 263/// ActOnStartOfObjCMethodDef - This routine sets up parameters; invisible 264/// and user declared, in the method definition's AST. 265void Sema::ActOnStartOfObjCMethodDef(Scope *FnBodyScope, Decl *D) { 266 assert(getCurMethodDecl() == 0 && "Method parsing confused"); 267 ObjCMethodDecl *MDecl = dyn_cast_or_null<ObjCMethodDecl>(D); 268 269 // If we don't have a valid method decl, simply return. 270 if (!MDecl) 271 return; 272 273 // Allow all of Sema to see that we are entering a method definition. 274 PushDeclContext(FnBodyScope, MDecl); 275 PushFunctionScope(); 276 277 // Create Decl objects for each parameter, entrring them in the scope for 278 // binding to their use. 279 280 // Insert the invisible arguments, self and _cmd! 281 MDecl->createImplicitParams(Context, MDecl->getClassInterface()); 282 283 PushOnScopeChains(MDecl->getSelfDecl(), FnBodyScope); 284 PushOnScopeChains(MDecl->getCmdDecl(), FnBodyScope); 285 286 // Introduce all of the other parameters into this scope. 287 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(), 288 E = MDecl->param_end(); PI != E; ++PI) { 289 ParmVarDecl *Param = (*PI); 290 if (!Param->isInvalidDecl() && 291 RequireCompleteType(Param->getLocation(), Param->getType(), 292 diag::err_typecheck_decl_incomplete_type)) 293 Param->setInvalidDecl(); 294 if ((*PI)->getIdentifier()) 295 PushOnScopeChains(*PI, FnBodyScope); 296 } 297 298 // In ARC, disallow definition of retain/release/autorelease/retainCount 299 if (getLangOptions().ObjCAutoRefCount) { 300 switch (MDecl->getMethodFamily()) { 301 case OMF_retain: 302 case OMF_retainCount: 303 case OMF_release: 304 case OMF_autorelease: 305 Diag(MDecl->getLocation(), diag::err_arc_illegal_method_def) 306 << MDecl->getSelector(); 307 break; 308 309 case OMF_None: 310 case OMF_dealloc: 311 case OMF_finalize: 312 case OMF_alloc: 313 case OMF_init: 314 case OMF_mutableCopy: 315 case OMF_copy: 316 case OMF_new: 317 case OMF_self: 318 case OMF_performSelector: 319 break; 320 } 321 } 322 323 // Warn on deprecated methods under -Wdeprecated-implementations, 324 // and prepare for warning on missing super calls. 325 if (ObjCInterfaceDecl *IC = MDecl->getClassInterface()) { 326 if (ObjCMethodDecl *IMD = 327 IC->lookupMethod(MDecl->getSelector(), MDecl->isInstanceMethod())) 328 DiagnoseObjCImplementedDeprecations(*this, 329 dyn_cast<NamedDecl>(IMD), 330 MDecl->getLocation(), 0); 331 332 // If this is "dealloc" or "finalize", set some bit here. 333 // Then in ActOnSuperMessage() (SemaExprObjC), set it back to false. 334 // Finally, in ActOnFinishFunctionBody() (SemaDecl), warn if flag is set. 335 // Only do this if the current class actually has a superclass. 336 if (IC->getSuperClass()) { 337 ObjCShouldCallSuperDealloc = 338 !(Context.getLangOptions().ObjCAutoRefCount || 339 Context.getLangOptions().getGC() == LangOptions::GCOnly) && 340 MDecl->getMethodFamily() == OMF_dealloc; 341 ObjCShouldCallSuperFinalize = 342 Context.getLangOptions().getGC() != LangOptions::NonGC && 343 MDecl->getMethodFamily() == OMF_finalize; 344 } 345 } 346} 347 348Decl *Sema:: 349ActOnStartClassInterface(SourceLocation AtInterfaceLoc, 350 IdentifierInfo *ClassName, SourceLocation ClassLoc, 351 IdentifierInfo *SuperName, SourceLocation SuperLoc, 352 Decl * const *ProtoRefs, unsigned NumProtoRefs, 353 const SourceLocation *ProtoLocs, 354 SourceLocation EndProtoLoc, AttributeList *AttrList) { 355 assert(ClassName && "Missing class identifier"); 356 357 // Check for another declaration kind with the same name. 358 NamedDecl *PrevDecl = LookupSingleName(TUScope, ClassName, ClassLoc, 359 LookupOrdinaryName, ForRedeclaration); 360 361 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 362 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName; 363 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 364 } 365 366 ObjCInterfaceDecl* IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 367 if (IDecl) { 368 // Class already seen. Is it a forward declaration? 369 if (!IDecl->isForwardDecl()) { 370 IDecl->setInvalidDecl(); 371 Diag(AtInterfaceLoc, diag::err_duplicate_class_def)<<IDecl->getDeclName(); 372 Diag(IDecl->getLocation(), diag::note_previous_definition); 373 374 // Return the previous class interface. 375 // FIXME: don't leak the objects passed in! 376 return IDecl; 377 } else { 378 IDecl->setLocation(AtInterfaceLoc); 379 IDecl->setForwardDecl(false); 380 IDecl->setClassLoc(ClassLoc); 381 // If the forward decl was in a PCH, we need to write it again in a 382 // dependent AST file. 383 IDecl->setChangedSinceDeserialization(true); 384 385 // Since this ObjCInterfaceDecl was created by a forward declaration, 386 // we now add it to the DeclContext since it wasn't added before 387 // (see ActOnForwardClassDeclaration). 388 IDecl->setLexicalDeclContext(CurContext); 389 CurContext->addDecl(IDecl); 390 391 if (AttrList) 392 ProcessDeclAttributeList(TUScope, IDecl, AttrList); 393 } 394 } else { 395 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtInterfaceLoc, 396 ClassName, ClassLoc); 397 if (AttrList) 398 ProcessDeclAttributeList(TUScope, IDecl, AttrList); 399 400 PushOnScopeChains(IDecl, TUScope); 401 } 402 403 if (SuperName) { 404 // Check if a different kind of symbol declared in this scope. 405 PrevDecl = LookupSingleName(TUScope, SuperName, SuperLoc, 406 LookupOrdinaryName); 407 408 if (!PrevDecl) { 409 // Try to correct for a typo in the superclass name. 410 TypoCorrection Corrected = CorrectTypo( 411 DeclarationNameInfo(SuperName, SuperLoc), LookupOrdinaryName, TUScope, 412 NULL, NULL, false, CTC_NoKeywords); 413 if ((PrevDecl = Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 414 Diag(SuperLoc, diag::err_undef_superclass_suggest) 415 << SuperName << ClassName << PrevDecl->getDeclName(); 416 Diag(PrevDecl->getLocation(), diag::note_previous_decl) 417 << PrevDecl->getDeclName(); 418 } 419 } 420 421 if (PrevDecl == IDecl) { 422 Diag(SuperLoc, diag::err_recursive_superclass) 423 << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc); 424 IDecl->setLocEnd(ClassLoc); 425 } else { 426 ObjCInterfaceDecl *SuperClassDecl = 427 dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 428 429 // Diagnose classes that inherit from deprecated classes. 430 if (SuperClassDecl) 431 (void)DiagnoseUseOfDecl(SuperClassDecl, SuperLoc); 432 433 if (PrevDecl && SuperClassDecl == 0) { 434 // The previous declaration was not a class decl. Check if we have a 435 // typedef. If we do, get the underlying class type. 436 if (const TypedefNameDecl *TDecl = 437 dyn_cast_or_null<TypedefNameDecl>(PrevDecl)) { 438 QualType T = TDecl->getUnderlyingType(); 439 if (T->isObjCObjectType()) { 440 if (NamedDecl *IDecl = T->getAs<ObjCObjectType>()->getInterface()) 441 SuperClassDecl = dyn_cast<ObjCInterfaceDecl>(IDecl); 442 } 443 } 444 445 // This handles the following case: 446 // 447 // typedef int SuperClass; 448 // @interface MyClass : SuperClass {} @end 449 // 450 if (!SuperClassDecl) { 451 Diag(SuperLoc, diag::err_redefinition_different_kind) << SuperName; 452 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 453 } 454 } 455 456 if (!dyn_cast_or_null<TypedefNameDecl>(PrevDecl)) { 457 if (!SuperClassDecl) 458 Diag(SuperLoc, diag::err_undef_superclass) 459 << SuperName << ClassName << SourceRange(AtInterfaceLoc, ClassLoc); 460 else if (SuperClassDecl->isForwardDecl()) { 461 Diag(SuperLoc, diag::err_forward_superclass) 462 << SuperClassDecl->getDeclName() << ClassName 463 << SourceRange(AtInterfaceLoc, ClassLoc); 464 Diag(SuperClassDecl->getLocation(), diag::note_forward_class); 465 SuperClassDecl = 0; 466 } 467 } 468 IDecl->setSuperClass(SuperClassDecl); 469 IDecl->setSuperClassLoc(SuperLoc); 470 IDecl->setLocEnd(SuperLoc); 471 } 472 } else { // we have a root class. 473 IDecl->setLocEnd(ClassLoc); 474 } 475 476 // Check then save referenced protocols. 477 if (NumProtoRefs) { 478 IDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs, 479 ProtoLocs, Context); 480 IDecl->setLocEnd(EndProtoLoc); 481 } 482 483 CheckObjCDeclScope(IDecl); 484 return IDecl; 485} 486 487/// ActOnCompatiblityAlias - this action is called after complete parsing of 488/// @compatibility_alias declaration. It sets up the alias relationships. 489Decl *Sema::ActOnCompatiblityAlias(SourceLocation AtLoc, 490 IdentifierInfo *AliasName, 491 SourceLocation AliasLocation, 492 IdentifierInfo *ClassName, 493 SourceLocation ClassLocation) { 494 // Look for previous declaration of alias name 495 NamedDecl *ADecl = LookupSingleName(TUScope, AliasName, AliasLocation, 496 LookupOrdinaryName, ForRedeclaration); 497 if (ADecl) { 498 if (isa<ObjCCompatibleAliasDecl>(ADecl)) 499 Diag(AliasLocation, diag::warn_previous_alias_decl); 500 else 501 Diag(AliasLocation, diag::err_conflicting_aliasing_type) << AliasName; 502 Diag(ADecl->getLocation(), diag::note_previous_declaration); 503 return 0; 504 } 505 // Check for class declaration 506 NamedDecl *CDeclU = LookupSingleName(TUScope, ClassName, ClassLocation, 507 LookupOrdinaryName, ForRedeclaration); 508 if (const TypedefNameDecl *TDecl = 509 dyn_cast_or_null<TypedefNameDecl>(CDeclU)) { 510 QualType T = TDecl->getUnderlyingType(); 511 if (T->isObjCObjectType()) { 512 if (NamedDecl *IDecl = T->getAs<ObjCObjectType>()->getInterface()) { 513 ClassName = IDecl->getIdentifier(); 514 CDeclU = LookupSingleName(TUScope, ClassName, ClassLocation, 515 LookupOrdinaryName, ForRedeclaration); 516 } 517 } 518 } 519 ObjCInterfaceDecl *CDecl = dyn_cast_or_null<ObjCInterfaceDecl>(CDeclU); 520 if (CDecl == 0) { 521 Diag(ClassLocation, diag::warn_undef_interface) << ClassName; 522 if (CDeclU) 523 Diag(CDeclU->getLocation(), diag::note_previous_declaration); 524 return 0; 525 } 526 527 // Everything checked out, instantiate a new alias declaration AST. 528 ObjCCompatibleAliasDecl *AliasDecl = 529 ObjCCompatibleAliasDecl::Create(Context, CurContext, AtLoc, AliasName, CDecl); 530 531 if (!CheckObjCDeclScope(AliasDecl)) 532 PushOnScopeChains(AliasDecl, TUScope); 533 534 return AliasDecl; 535} 536 537bool Sema::CheckForwardProtocolDeclarationForCircularDependency( 538 IdentifierInfo *PName, 539 SourceLocation &Ploc, SourceLocation PrevLoc, 540 const ObjCList<ObjCProtocolDecl> &PList) { 541 542 bool res = false; 543 for (ObjCList<ObjCProtocolDecl>::iterator I = PList.begin(), 544 E = PList.end(); I != E; ++I) { 545 if (ObjCProtocolDecl *PDecl = LookupProtocol((*I)->getIdentifier(), 546 Ploc)) { 547 if (PDecl->getIdentifier() == PName) { 548 Diag(Ploc, diag::err_protocol_has_circular_dependency); 549 Diag(PrevLoc, diag::note_previous_definition); 550 res = true; 551 } 552 if (CheckForwardProtocolDeclarationForCircularDependency(PName, Ploc, 553 PDecl->getLocation(), PDecl->getReferencedProtocols())) 554 res = true; 555 } 556 } 557 return res; 558} 559 560Decl * 561Sema::ActOnStartProtocolInterface(SourceLocation AtProtoInterfaceLoc, 562 IdentifierInfo *ProtocolName, 563 SourceLocation ProtocolLoc, 564 Decl * const *ProtoRefs, 565 unsigned NumProtoRefs, 566 const SourceLocation *ProtoLocs, 567 SourceLocation EndProtoLoc, 568 AttributeList *AttrList) { 569 bool err = false; 570 // FIXME: Deal with AttrList. 571 assert(ProtocolName && "Missing protocol identifier"); 572 ObjCProtocolDecl *PDecl = LookupProtocol(ProtocolName, ProtocolLoc); 573 if (PDecl) { 574 // Protocol already seen. Better be a forward protocol declaration 575 if (!PDecl->isForwardDecl()) { 576 Diag(ProtocolLoc, diag::warn_duplicate_protocol_def) << ProtocolName; 577 Diag(PDecl->getLocation(), diag::note_previous_definition); 578 // Just return the protocol we already had. 579 // FIXME: don't leak the objects passed in! 580 return PDecl; 581 } 582 ObjCList<ObjCProtocolDecl> PList; 583 PList.set((ObjCProtocolDecl *const*)ProtoRefs, NumProtoRefs, Context); 584 err = CheckForwardProtocolDeclarationForCircularDependency( 585 ProtocolName, ProtocolLoc, PDecl->getLocation(), PList); 586 587 // Make sure the cached decl gets a valid start location. 588 PDecl->setLocation(AtProtoInterfaceLoc); 589 PDecl->setForwardDecl(false); 590 // Since this ObjCProtocolDecl was created by a forward declaration, 591 // we now add it to the DeclContext since it wasn't added before 592 PDecl->setLexicalDeclContext(CurContext); 593 CurContext->addDecl(PDecl); 594 // Repeat in dependent AST files. 595 PDecl->setChangedSinceDeserialization(true); 596 } else { 597 PDecl = ObjCProtocolDecl::Create(Context, CurContext, 598 AtProtoInterfaceLoc,ProtocolName); 599 PushOnScopeChains(PDecl, TUScope); 600 PDecl->setForwardDecl(false); 601 } 602 if (AttrList) 603 ProcessDeclAttributeList(TUScope, PDecl, AttrList); 604 if (!err && NumProtoRefs ) { 605 /// Check then save referenced protocols. 606 PDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs, 607 ProtoLocs, Context); 608 PDecl->setLocEnd(EndProtoLoc); 609 } 610 611 CheckObjCDeclScope(PDecl); 612 return PDecl; 613} 614 615/// FindProtocolDeclaration - This routine looks up protocols and 616/// issues an error if they are not declared. It returns list of 617/// protocol declarations in its 'Protocols' argument. 618void 619Sema::FindProtocolDeclaration(bool WarnOnDeclarations, 620 const IdentifierLocPair *ProtocolId, 621 unsigned NumProtocols, 622 SmallVectorImpl<Decl *> &Protocols) { 623 for (unsigned i = 0; i != NumProtocols; ++i) { 624 ObjCProtocolDecl *PDecl = LookupProtocol(ProtocolId[i].first, 625 ProtocolId[i].second); 626 if (!PDecl) { 627 TypoCorrection Corrected = CorrectTypo( 628 DeclarationNameInfo(ProtocolId[i].first, ProtocolId[i].second), 629 LookupObjCProtocolName, TUScope, NULL, NULL, false, CTC_NoKeywords); 630 if ((PDecl = Corrected.getCorrectionDeclAs<ObjCProtocolDecl>())) { 631 Diag(ProtocolId[i].second, diag::err_undeclared_protocol_suggest) 632 << ProtocolId[i].first << Corrected.getCorrection(); 633 Diag(PDecl->getLocation(), diag::note_previous_decl) 634 << PDecl->getDeclName(); 635 } 636 } 637 638 if (!PDecl) { 639 Diag(ProtocolId[i].second, diag::err_undeclared_protocol) 640 << ProtocolId[i].first; 641 continue; 642 } 643 644 (void)DiagnoseUseOfDecl(PDecl, ProtocolId[i].second); 645 646 // If this is a forward declaration and we are supposed to warn in this 647 // case, do it. 648 if (WarnOnDeclarations && PDecl->isForwardDecl()) 649 Diag(ProtocolId[i].second, diag::warn_undef_protocolref) 650 << ProtocolId[i].first; 651 Protocols.push_back(PDecl); 652 } 653} 654 655/// DiagnoseClassExtensionDupMethods - Check for duplicate declaration of 656/// a class method in its extension. 657/// 658void Sema::DiagnoseClassExtensionDupMethods(ObjCCategoryDecl *CAT, 659 ObjCInterfaceDecl *ID) { 660 if (!ID) 661 return; // Possibly due to previous error 662 663 llvm::DenseMap<Selector, const ObjCMethodDecl*> MethodMap; 664 for (ObjCInterfaceDecl::method_iterator i = ID->meth_begin(), 665 e = ID->meth_end(); i != e; ++i) { 666 ObjCMethodDecl *MD = *i; 667 MethodMap[MD->getSelector()] = MD; 668 } 669 670 if (MethodMap.empty()) 671 return; 672 for (ObjCCategoryDecl::method_iterator i = CAT->meth_begin(), 673 e = CAT->meth_end(); i != e; ++i) { 674 ObjCMethodDecl *Method = *i; 675 const ObjCMethodDecl *&PrevMethod = MethodMap[Method->getSelector()]; 676 if (PrevMethod && !MatchTwoMethodDeclarations(Method, PrevMethod)) { 677 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 678 << Method->getDeclName(); 679 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 680 } 681 } 682} 683 684/// ActOnForwardProtocolDeclaration - Handle @protocol foo; 685Decl * 686Sema::ActOnForwardProtocolDeclaration(SourceLocation AtProtocolLoc, 687 const IdentifierLocPair *IdentList, 688 unsigned NumElts, 689 AttributeList *attrList) { 690 SmallVector<ObjCProtocolDecl*, 32> Protocols; 691 SmallVector<SourceLocation, 8> ProtoLocs; 692 693 for (unsigned i = 0; i != NumElts; ++i) { 694 IdentifierInfo *Ident = IdentList[i].first; 695 ObjCProtocolDecl *PDecl = LookupProtocol(Ident, IdentList[i].second); 696 bool isNew = false; 697 if (PDecl == 0) { // Not already seen? 698 PDecl = ObjCProtocolDecl::Create(Context, CurContext, 699 IdentList[i].second, Ident); 700 PushOnScopeChains(PDecl, TUScope, false); 701 isNew = true; 702 } 703 if (attrList) { 704 ProcessDeclAttributeList(TUScope, PDecl, attrList); 705 if (!isNew) 706 PDecl->setChangedSinceDeserialization(true); 707 } 708 Protocols.push_back(PDecl); 709 ProtoLocs.push_back(IdentList[i].second); 710 } 711 712 ObjCForwardProtocolDecl *PDecl = 713 ObjCForwardProtocolDecl::Create(Context, CurContext, AtProtocolLoc, 714 Protocols.data(), Protocols.size(), 715 ProtoLocs.data()); 716 CurContext->addDecl(PDecl); 717 CheckObjCDeclScope(PDecl); 718 return PDecl; 719} 720 721Decl *Sema:: 722ActOnStartCategoryInterface(SourceLocation AtInterfaceLoc, 723 IdentifierInfo *ClassName, SourceLocation ClassLoc, 724 IdentifierInfo *CategoryName, 725 SourceLocation CategoryLoc, 726 Decl * const *ProtoRefs, 727 unsigned NumProtoRefs, 728 const SourceLocation *ProtoLocs, 729 SourceLocation EndProtoLoc) { 730 ObjCCategoryDecl *CDecl; 731 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true); 732 733 /// Check that class of this category is already completely declared. 734 if (!IDecl || IDecl->isForwardDecl()) { 735 // Create an invalid ObjCCategoryDecl to serve as context for 736 // the enclosing method declarations. We mark the decl invalid 737 // to make it clear that this isn't a valid AST. 738 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc, 739 ClassLoc, CategoryLoc, CategoryName,IDecl); 740 CDecl->setInvalidDecl(); 741 Diag(ClassLoc, diag::err_undef_interface) << ClassName; 742 return CDecl; 743 } 744 745 if (!CategoryName && IDecl->getImplementation()) { 746 Diag(ClassLoc, diag::err_class_extension_after_impl) << ClassName; 747 Diag(IDecl->getImplementation()->getLocation(), 748 diag::note_implementation_declared); 749 } 750 751 if (CategoryName) { 752 /// Check for duplicate interface declaration for this category 753 ObjCCategoryDecl *CDeclChain; 754 for (CDeclChain = IDecl->getCategoryList(); CDeclChain; 755 CDeclChain = CDeclChain->getNextClassCategory()) { 756 if (CDeclChain->getIdentifier() == CategoryName) { 757 // Class extensions can be declared multiple times. 758 Diag(CategoryLoc, diag::warn_dup_category_def) 759 << ClassName << CategoryName; 760 Diag(CDeclChain->getLocation(), diag::note_previous_definition); 761 break; 762 } 763 } 764 } 765 766 CDecl = ObjCCategoryDecl::Create(Context, CurContext, AtInterfaceLoc, 767 ClassLoc, CategoryLoc, CategoryName, IDecl); 768 // FIXME: PushOnScopeChains? 769 CurContext->addDecl(CDecl); 770 771 // If the interface is deprecated, warn about it. 772 (void)DiagnoseUseOfDecl(IDecl, ClassLoc); 773 774 if (NumProtoRefs) { 775 CDecl->setProtocolList((ObjCProtocolDecl**)ProtoRefs, NumProtoRefs, 776 ProtoLocs, Context); 777 // Protocols in the class extension belong to the class. 778 if (CDecl->IsClassExtension()) 779 IDecl->mergeClassExtensionProtocolList((ObjCProtocolDecl**)ProtoRefs, 780 NumProtoRefs, Context); 781 } 782 783 CheckObjCDeclScope(CDecl); 784 return CDecl; 785} 786 787/// ActOnStartCategoryImplementation - Perform semantic checks on the 788/// category implementation declaration and build an ObjCCategoryImplDecl 789/// object. 790Decl *Sema::ActOnStartCategoryImplementation( 791 SourceLocation AtCatImplLoc, 792 IdentifierInfo *ClassName, SourceLocation ClassLoc, 793 IdentifierInfo *CatName, SourceLocation CatLoc) { 794 ObjCInterfaceDecl *IDecl = getObjCInterfaceDecl(ClassName, ClassLoc, true); 795 ObjCCategoryDecl *CatIDecl = 0; 796 if (IDecl) { 797 CatIDecl = IDecl->FindCategoryDeclaration(CatName); 798 if (!CatIDecl) { 799 // Category @implementation with no corresponding @interface. 800 // Create and install one. 801 CatIDecl = ObjCCategoryDecl::Create(Context, CurContext, SourceLocation(), 802 SourceLocation(), SourceLocation(), 803 CatName, IDecl); 804 } 805 } 806 807 ObjCCategoryImplDecl *CDecl = 808 ObjCCategoryImplDecl::Create(Context, CurContext, AtCatImplLoc, CatName, 809 IDecl); 810 /// Check that class of this category is already completely declared. 811 if (!IDecl || IDecl->isForwardDecl()) { 812 Diag(ClassLoc, diag::err_undef_interface) << ClassName; 813 CDecl->setInvalidDecl(); 814 } 815 816 // FIXME: PushOnScopeChains? 817 CurContext->addDecl(CDecl); 818 819 /// Check that CatName, category name, is not used in another implementation. 820 if (CatIDecl) { 821 if (CatIDecl->getImplementation()) { 822 Diag(ClassLoc, diag::err_dup_implementation_category) << ClassName 823 << CatName; 824 Diag(CatIDecl->getImplementation()->getLocation(), 825 diag::note_previous_definition); 826 } else { 827 CatIDecl->setImplementation(CDecl); 828 // Warn on implementating category of deprecated class under 829 // -Wdeprecated-implementations flag. 830 DiagnoseObjCImplementedDeprecations(*this, 831 dyn_cast<NamedDecl>(IDecl), 832 CDecl->getLocation(), 2); 833 } 834 } 835 836 CheckObjCDeclScope(CDecl); 837 return CDecl; 838} 839 840Decl *Sema::ActOnStartClassImplementation( 841 SourceLocation AtClassImplLoc, 842 IdentifierInfo *ClassName, SourceLocation ClassLoc, 843 IdentifierInfo *SuperClassname, 844 SourceLocation SuperClassLoc) { 845 ObjCInterfaceDecl* IDecl = 0; 846 // Check for another declaration kind with the same name. 847 NamedDecl *PrevDecl 848 = LookupSingleName(TUScope, ClassName, ClassLoc, LookupOrdinaryName, 849 ForRedeclaration); 850 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 851 Diag(ClassLoc, diag::err_redefinition_different_kind) << ClassName; 852 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 853 } else if ((IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl))) { 854 // If this is a forward declaration of an interface, warn. 855 if (IDecl->isForwardDecl()) { 856 Diag(ClassLoc, diag::warn_undef_interface) << ClassName; 857 IDecl = 0; 858 } 859 } else { 860 // We did not find anything with the name ClassName; try to correct for 861 // typos in the class name. 862 TypoCorrection Corrected = CorrectTypo( 863 DeclarationNameInfo(ClassName, ClassLoc), LookupOrdinaryName, TUScope, 864 NULL, NULL, false, CTC_NoKeywords); 865 if ((IDecl = Corrected.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 866 // Suggest the (potentially) correct interface name. However, put the 867 // fix-it hint itself in a separate note, since changing the name in 868 // the warning would make the fix-it change semantics.However, don't 869 // provide a code-modification hint or use the typo name for recovery, 870 // because this is just a warning. The program may actually be correct. 871 DeclarationName CorrectedName = Corrected.getCorrection(); 872 Diag(ClassLoc, diag::warn_undef_interface_suggest) 873 << ClassName << CorrectedName; 874 Diag(IDecl->getLocation(), diag::note_previous_decl) << CorrectedName 875 << FixItHint::CreateReplacement(ClassLoc, CorrectedName.getAsString()); 876 IDecl = 0; 877 } else { 878 Diag(ClassLoc, diag::warn_undef_interface) << ClassName; 879 } 880 } 881 882 // Check that super class name is valid class name 883 ObjCInterfaceDecl* SDecl = 0; 884 if (SuperClassname) { 885 // Check if a different kind of symbol declared in this scope. 886 PrevDecl = LookupSingleName(TUScope, SuperClassname, SuperClassLoc, 887 LookupOrdinaryName); 888 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 889 Diag(SuperClassLoc, diag::err_redefinition_different_kind) 890 << SuperClassname; 891 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 892 } else { 893 SDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 894 if (!SDecl) 895 Diag(SuperClassLoc, diag::err_undef_superclass) 896 << SuperClassname << ClassName; 897 else if (IDecl && IDecl->getSuperClass() != SDecl) { 898 // This implementation and its interface do not have the same 899 // super class. 900 Diag(SuperClassLoc, diag::err_conflicting_super_class) 901 << SDecl->getDeclName(); 902 Diag(SDecl->getLocation(), diag::note_previous_definition); 903 } 904 } 905 } 906 907 if (!IDecl) { 908 // Legacy case of @implementation with no corresponding @interface. 909 // Build, chain & install the interface decl into the identifier. 910 911 // FIXME: Do we support attributes on the @implementation? If so we should 912 // copy them over. 913 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtClassImplLoc, 914 ClassName, ClassLoc, false, true); 915 IDecl->setSuperClass(SDecl); 916 IDecl->setLocEnd(ClassLoc); 917 918 PushOnScopeChains(IDecl, TUScope); 919 } else { 920 // Mark the interface as being completed, even if it was just as 921 // @class ....; 922 // declaration; the user cannot reopen it. 923 IDecl->setForwardDecl(false); 924 } 925 926 ObjCImplementationDecl* IMPDecl = 927 ObjCImplementationDecl::Create(Context, CurContext, AtClassImplLoc, 928 IDecl, SDecl); 929 930 if (CheckObjCDeclScope(IMPDecl)) 931 return IMPDecl; 932 933 // Check that there is no duplicate implementation of this class. 934 if (IDecl->getImplementation()) { 935 // FIXME: Don't leak everything! 936 Diag(ClassLoc, diag::err_dup_implementation_class) << ClassName; 937 Diag(IDecl->getImplementation()->getLocation(), 938 diag::note_previous_definition); 939 } else { // add it to the list. 940 IDecl->setImplementation(IMPDecl); 941 PushOnScopeChains(IMPDecl, TUScope); 942 // Warn on implementating deprecated class under 943 // -Wdeprecated-implementations flag. 944 DiagnoseObjCImplementedDeprecations(*this, 945 dyn_cast<NamedDecl>(IDecl), 946 IMPDecl->getLocation(), 1); 947 } 948 return IMPDecl; 949} 950 951void Sema::CheckImplementationIvars(ObjCImplementationDecl *ImpDecl, 952 ObjCIvarDecl **ivars, unsigned numIvars, 953 SourceLocation RBrace) { 954 assert(ImpDecl && "missing implementation decl"); 955 ObjCInterfaceDecl* IDecl = ImpDecl->getClassInterface(); 956 if (!IDecl) 957 return; 958 /// Check case of non-existing @interface decl. 959 /// (legacy objective-c @implementation decl without an @interface decl). 960 /// Add implementations's ivar to the synthesize class's ivar list. 961 if (IDecl->isImplicitInterfaceDecl()) { 962 IDecl->setLocEnd(RBrace); 963 // Add ivar's to class's DeclContext. 964 for (unsigned i = 0, e = numIvars; i != e; ++i) { 965 ivars[i]->setLexicalDeclContext(ImpDecl); 966 IDecl->makeDeclVisibleInContext(ivars[i], false); 967 ImpDecl->addDecl(ivars[i]); 968 } 969 970 return; 971 } 972 // If implementation has empty ivar list, just return. 973 if (numIvars == 0) 974 return; 975 976 assert(ivars && "missing @implementation ivars"); 977 if (LangOpts.ObjCNonFragileABI2) { 978 if (ImpDecl->getSuperClass()) 979 Diag(ImpDecl->getLocation(), diag::warn_on_superclass_use); 980 for (unsigned i = 0; i < numIvars; i++) { 981 ObjCIvarDecl* ImplIvar = ivars[i]; 982 if (const ObjCIvarDecl *ClsIvar = 983 IDecl->getIvarDecl(ImplIvar->getIdentifier())) { 984 Diag(ImplIvar->getLocation(), diag::err_duplicate_ivar_declaration); 985 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 986 continue; 987 } 988 // Instance ivar to Implementation's DeclContext. 989 ImplIvar->setLexicalDeclContext(ImpDecl); 990 IDecl->makeDeclVisibleInContext(ImplIvar, false); 991 ImpDecl->addDecl(ImplIvar); 992 } 993 return; 994 } 995 // Check interface's Ivar list against those in the implementation. 996 // names and types must match. 997 // 998 unsigned j = 0; 999 ObjCInterfaceDecl::ivar_iterator 1000 IVI = IDecl->ivar_begin(), IVE = IDecl->ivar_end(); 1001 for (; numIvars > 0 && IVI != IVE; ++IVI) { 1002 ObjCIvarDecl* ImplIvar = ivars[j++]; 1003 ObjCIvarDecl* ClsIvar = *IVI; 1004 assert (ImplIvar && "missing implementation ivar"); 1005 assert (ClsIvar && "missing class ivar"); 1006 1007 // First, make sure the types match. 1008 if (Context.getCanonicalType(ImplIvar->getType()) != 1009 Context.getCanonicalType(ClsIvar->getType())) { 1010 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_type) 1011 << ImplIvar->getIdentifier() 1012 << ImplIvar->getType() << ClsIvar->getType(); 1013 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 1014 } else if (ImplIvar->isBitField() && ClsIvar->isBitField()) { 1015 Expr *ImplBitWidth = ImplIvar->getBitWidth(); 1016 Expr *ClsBitWidth = ClsIvar->getBitWidth(); 1017 if (ImplBitWidth->EvaluateAsInt(Context).getZExtValue() != 1018 ClsBitWidth->EvaluateAsInt(Context).getZExtValue()) { 1019 Diag(ImplBitWidth->getLocStart(), diag::err_conflicting_ivar_bitwidth) 1020 << ImplIvar->getIdentifier(); 1021 Diag(ClsBitWidth->getLocStart(), diag::note_previous_definition); 1022 } 1023 } 1024 // Make sure the names are identical. 1025 if (ImplIvar->getIdentifier() != ClsIvar->getIdentifier()) { 1026 Diag(ImplIvar->getLocation(), diag::err_conflicting_ivar_name) 1027 << ImplIvar->getIdentifier() << ClsIvar->getIdentifier(); 1028 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 1029 } 1030 --numIvars; 1031 } 1032 1033 if (numIvars > 0) 1034 Diag(ivars[j]->getLocation(), diag::err_inconsistant_ivar_count); 1035 else if (IVI != IVE) 1036 Diag((*IVI)->getLocation(), diag::err_inconsistant_ivar_count); 1037} 1038 1039void Sema::WarnUndefinedMethod(SourceLocation ImpLoc, ObjCMethodDecl *method, 1040 bool &IncompleteImpl, unsigned DiagID) { 1041 // No point warning no definition of method which is 'unavailable'. 1042 if (method->hasAttr<UnavailableAttr>()) 1043 return; 1044 if (!IncompleteImpl) { 1045 Diag(ImpLoc, diag::warn_incomplete_impl); 1046 IncompleteImpl = true; 1047 } 1048 if (DiagID == diag::warn_unimplemented_protocol_method) 1049 Diag(ImpLoc, DiagID) << method->getDeclName(); 1050 else 1051 Diag(method->getLocation(), DiagID) << method->getDeclName(); 1052} 1053 1054/// Determines if type B can be substituted for type A. Returns true if we can 1055/// guarantee that anything that the user will do to an object of type A can 1056/// also be done to an object of type B. This is trivially true if the two 1057/// types are the same, or if B is a subclass of A. It becomes more complex 1058/// in cases where protocols are involved. 1059/// 1060/// Object types in Objective-C describe the minimum requirements for an 1061/// object, rather than providing a complete description of a type. For 1062/// example, if A is a subclass of B, then B* may refer to an instance of A. 1063/// The principle of substitutability means that we may use an instance of A 1064/// anywhere that we may use an instance of B - it will implement all of the 1065/// ivars of B and all of the methods of B. 1066/// 1067/// This substitutability is important when type checking methods, because 1068/// the implementation may have stricter type definitions than the interface. 1069/// The interface specifies minimum requirements, but the implementation may 1070/// have more accurate ones. For example, a method may privately accept 1071/// instances of B, but only publish that it accepts instances of A. Any 1072/// object passed to it will be type checked against B, and so will implicitly 1073/// by a valid A*. Similarly, a method may return a subclass of the class that 1074/// it is declared as returning. 1075/// 1076/// This is most important when considering subclassing. A method in a 1077/// subclass must accept any object as an argument that its superclass's 1078/// implementation accepts. It may, however, accept a more general type 1079/// without breaking substitutability (i.e. you can still use the subclass 1080/// anywhere that you can use the superclass, but not vice versa). The 1081/// converse requirement applies to return types: the return type for a 1082/// subclass method must be a valid object of the kind that the superclass 1083/// advertises, but it may be specified more accurately. This avoids the need 1084/// for explicit down-casting by callers. 1085/// 1086/// Note: This is a stricter requirement than for assignment. 1087static bool isObjCTypeSubstitutable(ASTContext &Context, 1088 const ObjCObjectPointerType *A, 1089 const ObjCObjectPointerType *B, 1090 bool rejectId) { 1091 // Reject a protocol-unqualified id. 1092 if (rejectId && B->isObjCIdType()) return false; 1093 1094 // If B is a qualified id, then A must also be a qualified id and it must 1095 // implement all of the protocols in B. It may not be a qualified class. 1096 // For example, MyClass<A> can be assigned to id<A>, but MyClass<A> is a 1097 // stricter definition so it is not substitutable for id<A>. 1098 if (B->isObjCQualifiedIdType()) { 1099 return A->isObjCQualifiedIdType() && 1100 Context.ObjCQualifiedIdTypesAreCompatible(QualType(A, 0), 1101 QualType(B,0), 1102 false); 1103 } 1104 1105 /* 1106 // id is a special type that bypasses type checking completely. We want a 1107 // warning when it is used in one place but not another. 1108 if (C.isObjCIdType(A) || C.isObjCIdType(B)) return false; 1109 1110 1111 // If B is a qualified id, then A must also be a qualified id (which it isn't 1112 // if we've got this far) 1113 if (B->isObjCQualifiedIdType()) return false; 1114 */ 1115 1116 // Now we know that A and B are (potentially-qualified) class types. The 1117 // normal rules for assignment apply. 1118 return Context.canAssignObjCInterfaces(A, B); 1119} 1120 1121static SourceRange getTypeRange(TypeSourceInfo *TSI) { 1122 return (TSI ? TSI->getTypeLoc().getSourceRange() : SourceRange()); 1123} 1124 1125static bool CheckMethodOverrideReturn(Sema &S, 1126 ObjCMethodDecl *MethodImpl, 1127 ObjCMethodDecl *MethodDecl, 1128 bool IsProtocolMethodDecl, 1129 bool IsOverridingMode, 1130 bool Warn) { 1131 if (IsProtocolMethodDecl && 1132 (MethodDecl->getObjCDeclQualifier() != 1133 MethodImpl->getObjCDeclQualifier())) { 1134 if (Warn) { 1135 S.Diag(MethodImpl->getLocation(), 1136 (IsOverridingMode ? 1137 diag::warn_conflicting_overriding_ret_type_modifiers 1138 : diag::warn_conflicting_ret_type_modifiers)) 1139 << MethodImpl->getDeclName() 1140 << getTypeRange(MethodImpl->getResultTypeSourceInfo()); 1141 S.Diag(MethodDecl->getLocation(), diag::note_previous_declaration) 1142 << getTypeRange(MethodDecl->getResultTypeSourceInfo()); 1143 } 1144 else 1145 return false; 1146 } 1147 1148 if (S.Context.hasSameUnqualifiedType(MethodImpl->getResultType(), 1149 MethodDecl->getResultType())) 1150 return true; 1151 if (!Warn) 1152 return false; 1153 1154 unsigned DiagID = 1155 IsOverridingMode ? diag::warn_conflicting_overriding_ret_types 1156 : diag::warn_conflicting_ret_types; 1157 1158 // Mismatches between ObjC pointers go into a different warning 1159 // category, and sometimes they're even completely whitelisted. 1160 if (const ObjCObjectPointerType *ImplPtrTy = 1161 MethodImpl->getResultType()->getAs<ObjCObjectPointerType>()) { 1162 if (const ObjCObjectPointerType *IfacePtrTy = 1163 MethodDecl->getResultType()->getAs<ObjCObjectPointerType>()) { 1164 // Allow non-matching return types as long as they don't violate 1165 // the principle of substitutability. Specifically, we permit 1166 // return types that are subclasses of the declared return type, 1167 // or that are more-qualified versions of the declared type. 1168 if (isObjCTypeSubstitutable(S.Context, IfacePtrTy, ImplPtrTy, false)) 1169 return false; 1170 1171 DiagID = 1172 IsOverridingMode ? diag::warn_non_covariant_overriding_ret_types 1173 : diag::warn_non_covariant_ret_types; 1174 } 1175 } 1176 1177 S.Diag(MethodImpl->getLocation(), DiagID) 1178 << MethodImpl->getDeclName() 1179 << MethodDecl->getResultType() 1180 << MethodImpl->getResultType() 1181 << getTypeRange(MethodImpl->getResultTypeSourceInfo()); 1182 S.Diag(MethodDecl->getLocation(), 1183 IsOverridingMode ? diag::note_previous_declaration 1184 : diag::note_previous_definition) 1185 << getTypeRange(MethodDecl->getResultTypeSourceInfo()); 1186 return false; 1187} 1188 1189static bool CheckMethodOverrideParam(Sema &S, 1190 ObjCMethodDecl *MethodImpl, 1191 ObjCMethodDecl *MethodDecl, 1192 ParmVarDecl *ImplVar, 1193 ParmVarDecl *IfaceVar, 1194 bool IsProtocolMethodDecl, 1195 bool IsOverridingMode, 1196 bool Warn) { 1197 if (IsProtocolMethodDecl && 1198 (ImplVar->getObjCDeclQualifier() != 1199 IfaceVar->getObjCDeclQualifier())) { 1200 if (Warn) { 1201 if (IsOverridingMode) 1202 S.Diag(ImplVar->getLocation(), 1203 diag::warn_conflicting_overriding_param_modifiers) 1204 << getTypeRange(ImplVar->getTypeSourceInfo()) 1205 << MethodImpl->getDeclName(); 1206 else S.Diag(ImplVar->getLocation(), 1207 diag::warn_conflicting_param_modifiers) 1208 << getTypeRange(ImplVar->getTypeSourceInfo()) 1209 << MethodImpl->getDeclName(); 1210 S.Diag(IfaceVar->getLocation(), diag::note_previous_declaration) 1211 << getTypeRange(IfaceVar->getTypeSourceInfo()); 1212 } 1213 else 1214 return false; 1215 } 1216 1217 QualType ImplTy = ImplVar->getType(); 1218 QualType IfaceTy = IfaceVar->getType(); 1219 1220 if (S.Context.hasSameUnqualifiedType(ImplTy, IfaceTy)) 1221 return true; 1222 1223 if (!Warn) 1224 return false; 1225 unsigned DiagID = 1226 IsOverridingMode ? diag::warn_conflicting_overriding_param_types 1227 : diag::warn_conflicting_param_types; 1228 1229 // Mismatches between ObjC pointers go into a different warning 1230 // category, and sometimes they're even completely whitelisted. 1231 if (const ObjCObjectPointerType *ImplPtrTy = 1232 ImplTy->getAs<ObjCObjectPointerType>()) { 1233 if (const ObjCObjectPointerType *IfacePtrTy = 1234 IfaceTy->getAs<ObjCObjectPointerType>()) { 1235 // Allow non-matching argument types as long as they don't 1236 // violate the principle of substitutability. Specifically, the 1237 // implementation must accept any objects that the superclass 1238 // accepts, however it may also accept others. 1239 if (isObjCTypeSubstitutable(S.Context, ImplPtrTy, IfacePtrTy, true)) 1240 return false; 1241 1242 DiagID = 1243 IsOverridingMode ? diag::warn_non_contravariant_overriding_param_types 1244 : diag::warn_non_contravariant_param_types; 1245 } 1246 } 1247 1248 S.Diag(ImplVar->getLocation(), DiagID) 1249 << getTypeRange(ImplVar->getTypeSourceInfo()) 1250 << MethodImpl->getDeclName() << IfaceTy << ImplTy; 1251 S.Diag(IfaceVar->getLocation(), 1252 (IsOverridingMode ? diag::note_previous_declaration 1253 : diag::note_previous_definition)) 1254 << getTypeRange(IfaceVar->getTypeSourceInfo()); 1255 return false; 1256} 1257 1258/// In ARC, check whether the conventional meanings of the two methods 1259/// match. If they don't, it's a hard error. 1260static bool checkMethodFamilyMismatch(Sema &S, ObjCMethodDecl *impl, 1261 ObjCMethodDecl *decl) { 1262 ObjCMethodFamily implFamily = impl->getMethodFamily(); 1263 ObjCMethodFamily declFamily = decl->getMethodFamily(); 1264 if (implFamily == declFamily) return false; 1265 1266 // Since conventions are sorted by selector, the only possibility is 1267 // that the types differ enough to cause one selector or the other 1268 // to fall out of the family. 1269 assert(implFamily == OMF_None || declFamily == OMF_None); 1270 1271 // No further diagnostics required on invalid declarations. 1272 if (impl->isInvalidDecl() || decl->isInvalidDecl()) return true; 1273 1274 const ObjCMethodDecl *unmatched = impl; 1275 ObjCMethodFamily family = declFamily; 1276 unsigned errorID = diag::err_arc_lost_method_convention; 1277 unsigned noteID = diag::note_arc_lost_method_convention; 1278 if (declFamily == OMF_None) { 1279 unmatched = decl; 1280 family = implFamily; 1281 errorID = diag::err_arc_gained_method_convention; 1282 noteID = diag::note_arc_gained_method_convention; 1283 } 1284 1285 // Indexes into a %select clause in the diagnostic. 1286 enum FamilySelector { 1287 F_alloc, F_copy, F_mutableCopy = F_copy, F_init, F_new 1288 }; 1289 FamilySelector familySelector = FamilySelector(); 1290 1291 switch (family) { 1292 case OMF_None: llvm_unreachable("logic error, no method convention"); 1293 case OMF_retain: 1294 case OMF_release: 1295 case OMF_autorelease: 1296 case OMF_dealloc: 1297 case OMF_finalize: 1298 case OMF_retainCount: 1299 case OMF_self: 1300 case OMF_performSelector: 1301 // Mismatches for these methods don't change ownership 1302 // conventions, so we don't care. 1303 return false; 1304 1305 case OMF_init: familySelector = F_init; break; 1306 case OMF_alloc: familySelector = F_alloc; break; 1307 case OMF_copy: familySelector = F_copy; break; 1308 case OMF_mutableCopy: familySelector = F_mutableCopy; break; 1309 case OMF_new: familySelector = F_new; break; 1310 } 1311 1312 enum ReasonSelector { R_NonObjectReturn, R_UnrelatedReturn }; 1313 ReasonSelector reasonSelector; 1314 1315 // The only reason these methods don't fall within their families is 1316 // due to unusual result types. 1317 if (unmatched->getResultType()->isObjCObjectPointerType()) { 1318 reasonSelector = R_UnrelatedReturn; 1319 } else { 1320 reasonSelector = R_NonObjectReturn; 1321 } 1322 1323 S.Diag(impl->getLocation(), errorID) << familySelector << reasonSelector; 1324 S.Diag(decl->getLocation(), noteID) << familySelector << reasonSelector; 1325 1326 return true; 1327} 1328 1329void Sema::WarnConflictingTypedMethods(ObjCMethodDecl *ImpMethodDecl, 1330 ObjCMethodDecl *MethodDecl, 1331 bool IsProtocolMethodDecl, 1332 bool IsOverridingMode) { 1333 if (getLangOptions().ObjCAutoRefCount && 1334 !IsOverridingMode && 1335 checkMethodFamilyMismatch(*this, ImpMethodDecl, MethodDecl)) 1336 return; 1337 1338 CheckMethodOverrideReturn(*this, ImpMethodDecl, MethodDecl, 1339 IsProtocolMethodDecl, IsOverridingMode, 1340 true); 1341 1342 for (ObjCMethodDecl::param_iterator IM = ImpMethodDecl->param_begin(), 1343 IF = MethodDecl->param_begin(), EM = ImpMethodDecl->param_end(); 1344 IM != EM; ++IM, ++IF) { 1345 CheckMethodOverrideParam(*this, ImpMethodDecl, MethodDecl, *IM, *IF, 1346 IsProtocolMethodDecl, IsOverridingMode, true); 1347 } 1348 1349 if (ImpMethodDecl->isVariadic() != MethodDecl->isVariadic()) { 1350 if (IsOverridingMode) 1351 Diag(ImpMethodDecl->getLocation(), 1352 diag::warn_conflicting_overriding_variadic); 1353 else 1354 Diag(ImpMethodDecl->getLocation(), diag::warn_conflicting_variadic); 1355 Diag(MethodDecl->getLocation(), diag::note_previous_declaration); 1356 } 1357} 1358 1359/// WarnExactTypedMethods - This routine issues a warning if method 1360/// implementation declaration matches exactly that of its declaration. 1361void Sema::WarnExactTypedMethods(ObjCMethodDecl *ImpMethodDecl, 1362 ObjCMethodDecl *MethodDecl, 1363 bool IsProtocolMethodDecl) { 1364 // don't issue warning when protocol method is optional because primary 1365 // class is not required to implement it and it is safe for protocol 1366 // to implement it. 1367 if (MethodDecl->getImplementationControl() == ObjCMethodDecl::Optional) 1368 return; 1369 // don't issue warning when primary class's method is 1370 // depecated/unavailable. 1371 if (MethodDecl->hasAttr<UnavailableAttr>() || 1372 MethodDecl->hasAttr<DeprecatedAttr>()) 1373 return; 1374 1375 bool match = CheckMethodOverrideReturn(*this, ImpMethodDecl, MethodDecl, 1376 IsProtocolMethodDecl, false, false); 1377 if (match) 1378 for (ObjCMethodDecl::param_iterator IM = ImpMethodDecl->param_begin(), 1379 IF = MethodDecl->param_begin(), EM = ImpMethodDecl->param_end(); 1380 IM != EM; ++IM, ++IF) { 1381 match = CheckMethodOverrideParam(*this, ImpMethodDecl, MethodDecl, 1382 *IM, *IF, 1383 IsProtocolMethodDecl, false, false); 1384 if (!match) 1385 break; 1386 } 1387 if (match) 1388 match = (ImpMethodDecl->isVariadic() == MethodDecl->isVariadic()); 1389 if (match) 1390 match = !(MethodDecl->isClassMethod() && 1391 MethodDecl->getSelector() == GetNullarySelector("load", Context)); 1392 1393 if (match) { 1394 Diag(ImpMethodDecl->getLocation(), 1395 diag::warn_category_method_impl_match); 1396 Diag(MethodDecl->getLocation(), diag::note_method_declared_at); 1397 } 1398} 1399 1400/// FIXME: Type hierarchies in Objective-C can be deep. We could most likely 1401/// improve the efficiency of selector lookups and type checking by associating 1402/// with each protocol / interface / category the flattened instance tables. If 1403/// we used an immutable set to keep the table then it wouldn't add significant 1404/// memory cost and it would be handy for lookups. 1405 1406/// CheckProtocolMethodDefs - This routine checks unimplemented methods 1407/// Declared in protocol, and those referenced by it. 1408void Sema::CheckProtocolMethodDefs(SourceLocation ImpLoc, 1409 ObjCProtocolDecl *PDecl, 1410 bool& IncompleteImpl, 1411 const llvm::DenseSet<Selector> &InsMap, 1412 const llvm::DenseSet<Selector> &ClsMap, 1413 ObjCContainerDecl *CDecl) { 1414 ObjCInterfaceDecl *IDecl; 1415 if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl)) 1416 IDecl = C->getClassInterface(); 1417 else 1418 IDecl = dyn_cast<ObjCInterfaceDecl>(CDecl); 1419 assert (IDecl && "CheckProtocolMethodDefs - IDecl is null"); 1420 1421 ObjCInterfaceDecl *Super = IDecl->getSuperClass(); 1422 ObjCInterfaceDecl *NSIDecl = 0; 1423 if (getLangOptions().NeXTRuntime) { 1424 // check to see if class implements forwardInvocation method and objects 1425 // of this class are derived from 'NSProxy' so that to forward requests 1426 // from one object to another. 1427 // Under such conditions, which means that every method possible is 1428 // implemented in the class, we should not issue "Method definition not 1429 // found" warnings. 1430 // FIXME: Use a general GetUnarySelector method for this. 1431 IdentifierInfo* II = &Context.Idents.get("forwardInvocation"); 1432 Selector fISelector = Context.Selectors.getSelector(1, &II); 1433 if (InsMap.count(fISelector)) 1434 // Is IDecl derived from 'NSProxy'? If so, no instance methods 1435 // need be implemented in the implementation. 1436 NSIDecl = IDecl->lookupInheritedClass(&Context.Idents.get("NSProxy")); 1437 } 1438 1439 // If a method lookup fails locally we still need to look and see if 1440 // the method was implemented by a base class or an inherited 1441 // protocol. This lookup is slow, but occurs rarely in correct code 1442 // and otherwise would terminate in a warning. 1443 1444 // check unimplemented instance methods. 1445 if (!NSIDecl) 1446 for (ObjCProtocolDecl::instmeth_iterator I = PDecl->instmeth_begin(), 1447 E = PDecl->instmeth_end(); I != E; ++I) { 1448 ObjCMethodDecl *method = *I; 1449 if (method->getImplementationControl() != ObjCMethodDecl::Optional && 1450 !method->isSynthesized() && !InsMap.count(method->getSelector()) && 1451 (!Super || 1452 !Super->lookupInstanceMethod(method->getSelector()))) { 1453 // Ugly, but necessary. Method declared in protcol might have 1454 // have been synthesized due to a property declared in the class which 1455 // uses the protocol. 1456 ObjCMethodDecl *MethodInClass = 1457 IDecl->lookupInstanceMethod(method->getSelector()); 1458 if (!MethodInClass || !MethodInClass->isSynthesized()) { 1459 unsigned DIAG = diag::warn_unimplemented_protocol_method; 1460 if (Diags.getDiagnosticLevel(DIAG, ImpLoc) 1461 != DiagnosticsEngine::Ignored) { 1462 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG); 1463 Diag(method->getLocation(), diag::note_method_declared_at); 1464 Diag(CDecl->getLocation(), diag::note_required_for_protocol_at) 1465 << PDecl->getDeclName(); 1466 } 1467 } 1468 } 1469 } 1470 // check unimplemented class methods 1471 for (ObjCProtocolDecl::classmeth_iterator 1472 I = PDecl->classmeth_begin(), E = PDecl->classmeth_end(); 1473 I != E; ++I) { 1474 ObjCMethodDecl *method = *I; 1475 if (method->getImplementationControl() != ObjCMethodDecl::Optional && 1476 !ClsMap.count(method->getSelector()) && 1477 (!Super || !Super->lookupClassMethod(method->getSelector()))) { 1478 unsigned DIAG = diag::warn_unimplemented_protocol_method; 1479 if (Diags.getDiagnosticLevel(DIAG, ImpLoc) != 1480 DiagnosticsEngine::Ignored) { 1481 WarnUndefinedMethod(ImpLoc, method, IncompleteImpl, DIAG); 1482 Diag(method->getLocation(), diag::note_method_declared_at); 1483 Diag(IDecl->getLocation(), diag::note_required_for_protocol_at) << 1484 PDecl->getDeclName(); 1485 } 1486 } 1487 } 1488 // Check on this protocols's referenced protocols, recursively. 1489 for (ObjCProtocolDecl::protocol_iterator PI = PDecl->protocol_begin(), 1490 E = PDecl->protocol_end(); PI != E; ++PI) 1491 CheckProtocolMethodDefs(ImpLoc, *PI, IncompleteImpl, InsMap, ClsMap, IDecl); 1492} 1493 1494/// MatchAllMethodDeclarations - Check methods declared in interface 1495/// or protocol against those declared in their implementations. 1496/// 1497void Sema::MatchAllMethodDeclarations(const llvm::DenseSet<Selector> &InsMap, 1498 const llvm::DenseSet<Selector> &ClsMap, 1499 llvm::DenseSet<Selector> &InsMapSeen, 1500 llvm::DenseSet<Selector> &ClsMapSeen, 1501 ObjCImplDecl* IMPDecl, 1502 ObjCContainerDecl* CDecl, 1503 bool &IncompleteImpl, 1504 bool ImmediateClass, 1505 bool WarnExactMatch) { 1506 // Check and see if instance methods in class interface have been 1507 // implemented in the implementation class. If so, their types match. 1508 for (ObjCInterfaceDecl::instmeth_iterator I = CDecl->instmeth_begin(), 1509 E = CDecl->instmeth_end(); I != E; ++I) { 1510 if (InsMapSeen.count((*I)->getSelector())) 1511 continue; 1512 InsMapSeen.insert((*I)->getSelector()); 1513 if (!(*I)->isSynthesized() && 1514 !InsMap.count((*I)->getSelector())) { 1515 if (ImmediateClass) 1516 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl, 1517 diag::note_undef_method_impl); 1518 continue; 1519 } else { 1520 ObjCMethodDecl *ImpMethodDecl = 1521 IMPDecl->getInstanceMethod((*I)->getSelector()); 1522 assert(CDecl->getInstanceMethod((*I)->getSelector()) && 1523 "Expected to find the method through lookup as well"); 1524 ObjCMethodDecl *MethodDecl = *I; 1525 // ImpMethodDecl may be null as in a @dynamic property. 1526 if (ImpMethodDecl) { 1527 if (!WarnExactMatch) 1528 WarnConflictingTypedMethods(ImpMethodDecl, MethodDecl, 1529 isa<ObjCProtocolDecl>(CDecl)); 1530 else if (!MethodDecl->isSynthesized()) 1531 WarnExactTypedMethods(ImpMethodDecl, MethodDecl, 1532 isa<ObjCProtocolDecl>(CDecl)); 1533 } 1534 } 1535 } 1536 1537 // Check and see if class methods in class interface have been 1538 // implemented in the implementation class. If so, their types match. 1539 for (ObjCInterfaceDecl::classmeth_iterator 1540 I = CDecl->classmeth_begin(), E = CDecl->classmeth_end(); I != E; ++I) { 1541 if (ClsMapSeen.count((*I)->getSelector())) 1542 continue; 1543 ClsMapSeen.insert((*I)->getSelector()); 1544 if (!ClsMap.count((*I)->getSelector())) { 1545 if (ImmediateClass) 1546 WarnUndefinedMethod(IMPDecl->getLocation(), *I, IncompleteImpl, 1547 diag::note_undef_method_impl); 1548 } else { 1549 ObjCMethodDecl *ImpMethodDecl = 1550 IMPDecl->getClassMethod((*I)->getSelector()); 1551 assert(CDecl->getClassMethod((*I)->getSelector()) && 1552 "Expected to find the method through lookup as well"); 1553 ObjCMethodDecl *MethodDecl = *I; 1554 if (!WarnExactMatch) 1555 WarnConflictingTypedMethods(ImpMethodDecl, MethodDecl, 1556 isa<ObjCProtocolDecl>(CDecl)); 1557 else 1558 WarnExactTypedMethods(ImpMethodDecl, MethodDecl, 1559 isa<ObjCProtocolDecl>(CDecl)); 1560 } 1561 } 1562 1563 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) { 1564 // Also methods in class extensions need be looked at next. 1565 for (const ObjCCategoryDecl *ClsExtDecl = I->getFirstClassExtension(); 1566 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) 1567 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1568 IMPDecl, 1569 const_cast<ObjCCategoryDecl *>(ClsExtDecl), 1570 IncompleteImpl, false, WarnExactMatch); 1571 1572 // Check for any implementation of a methods declared in protocol. 1573 for (ObjCInterfaceDecl::all_protocol_iterator 1574 PI = I->all_referenced_protocol_begin(), 1575 E = I->all_referenced_protocol_end(); PI != E; ++PI) 1576 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1577 IMPDecl, 1578 (*PI), IncompleteImpl, false, WarnExactMatch); 1579 1580 // FIXME. For now, we are not checking for extact match of methods 1581 // in category implementation and its primary class's super class. 1582 if (!WarnExactMatch && I->getSuperClass()) 1583 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1584 IMPDecl, 1585 I->getSuperClass(), IncompleteImpl, false); 1586 } 1587} 1588 1589/// CheckCategoryVsClassMethodMatches - Checks that methods implemented in 1590/// category matches with those implemented in its primary class and 1591/// warns each time an exact match is found. 1592void Sema::CheckCategoryVsClassMethodMatches( 1593 ObjCCategoryImplDecl *CatIMPDecl) { 1594 llvm::DenseSet<Selector> InsMap, ClsMap; 1595 1596 for (ObjCImplementationDecl::instmeth_iterator 1597 I = CatIMPDecl->instmeth_begin(), 1598 E = CatIMPDecl->instmeth_end(); I!=E; ++I) 1599 InsMap.insert((*I)->getSelector()); 1600 1601 for (ObjCImplementationDecl::classmeth_iterator 1602 I = CatIMPDecl->classmeth_begin(), 1603 E = CatIMPDecl->classmeth_end(); I != E; ++I) 1604 ClsMap.insert((*I)->getSelector()); 1605 if (InsMap.empty() && ClsMap.empty()) 1606 return; 1607 1608 // Get category's primary class. 1609 ObjCCategoryDecl *CatDecl = CatIMPDecl->getCategoryDecl(); 1610 if (!CatDecl) 1611 return; 1612 ObjCInterfaceDecl *IDecl = CatDecl->getClassInterface(); 1613 if (!IDecl) 1614 return; 1615 llvm::DenseSet<Selector> InsMapSeen, ClsMapSeen; 1616 bool IncompleteImpl = false; 1617 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1618 CatIMPDecl, IDecl, 1619 IncompleteImpl, false, true /*WarnExactMatch*/); 1620} 1621 1622void Sema::ImplMethodsVsClassMethods(Scope *S, ObjCImplDecl* IMPDecl, 1623 ObjCContainerDecl* CDecl, 1624 bool IncompleteImpl) { 1625 llvm::DenseSet<Selector> InsMap; 1626 // Check and see if instance methods in class interface have been 1627 // implemented in the implementation class. 1628 for (ObjCImplementationDecl::instmeth_iterator 1629 I = IMPDecl->instmeth_begin(), E = IMPDecl->instmeth_end(); I!=E; ++I) 1630 InsMap.insert((*I)->getSelector()); 1631 1632 // Check and see if properties declared in the interface have either 1) 1633 // an implementation or 2) there is a @synthesize/@dynamic implementation 1634 // of the property in the @implementation. 1635 if (isa<ObjCInterfaceDecl>(CDecl) && 1636 !(LangOpts.ObjCDefaultSynthProperties && LangOpts.ObjCNonFragileABI2)) 1637 DiagnoseUnimplementedProperties(S, IMPDecl, CDecl, InsMap); 1638 1639 llvm::DenseSet<Selector> ClsMap; 1640 for (ObjCImplementationDecl::classmeth_iterator 1641 I = IMPDecl->classmeth_begin(), 1642 E = IMPDecl->classmeth_end(); I != E; ++I) 1643 ClsMap.insert((*I)->getSelector()); 1644 1645 // Check for type conflict of methods declared in a class/protocol and 1646 // its implementation; if any. 1647 llvm::DenseSet<Selector> InsMapSeen, ClsMapSeen; 1648 MatchAllMethodDeclarations(InsMap, ClsMap, InsMapSeen, ClsMapSeen, 1649 IMPDecl, CDecl, 1650 IncompleteImpl, true); 1651 1652 // check all methods implemented in category against those declared 1653 // in its primary class. 1654 if (ObjCCategoryImplDecl *CatDecl = 1655 dyn_cast<ObjCCategoryImplDecl>(IMPDecl)) 1656 CheckCategoryVsClassMethodMatches(CatDecl); 1657 1658 // Check the protocol list for unimplemented methods in the @implementation 1659 // class. 1660 // Check and see if class methods in class interface have been 1661 // implemented in the implementation class. 1662 1663 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl> (CDecl)) { 1664 for (ObjCInterfaceDecl::all_protocol_iterator 1665 PI = I->all_referenced_protocol_begin(), 1666 E = I->all_referenced_protocol_end(); PI != E; ++PI) 1667 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl, 1668 InsMap, ClsMap, I); 1669 // Check class extensions (unnamed categories) 1670 for (const ObjCCategoryDecl *Categories = I->getFirstClassExtension(); 1671 Categories; Categories = Categories->getNextClassExtension()) 1672 ImplMethodsVsClassMethods(S, IMPDecl, 1673 const_cast<ObjCCategoryDecl*>(Categories), 1674 IncompleteImpl); 1675 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(CDecl)) { 1676 // For extended class, unimplemented methods in its protocols will 1677 // be reported in the primary class. 1678 if (!C->IsClassExtension()) { 1679 for (ObjCCategoryDecl::protocol_iterator PI = C->protocol_begin(), 1680 E = C->protocol_end(); PI != E; ++PI) 1681 CheckProtocolMethodDefs(IMPDecl->getLocation(), *PI, IncompleteImpl, 1682 InsMap, ClsMap, CDecl); 1683 // Report unimplemented properties in the category as well. 1684 // When reporting on missing setter/getters, do not report when 1685 // setter/getter is implemented in category's primary class 1686 // implementation. 1687 if (ObjCInterfaceDecl *ID = C->getClassInterface()) 1688 if (ObjCImplDecl *IMP = ID->getImplementation()) { 1689 for (ObjCImplementationDecl::instmeth_iterator 1690 I = IMP->instmeth_begin(), E = IMP->instmeth_end(); I!=E; ++I) 1691 InsMap.insert((*I)->getSelector()); 1692 } 1693 DiagnoseUnimplementedProperties(S, IMPDecl, CDecl, InsMap); 1694 } 1695 } else 1696 llvm_unreachable("invalid ObjCContainerDecl type."); 1697} 1698 1699/// ActOnForwardClassDeclaration - 1700Sema::DeclGroupPtrTy 1701Sema::ActOnForwardClassDeclaration(SourceLocation AtClassLoc, 1702 IdentifierInfo **IdentList, 1703 SourceLocation *IdentLocs, 1704 unsigned NumElts) { 1705 SmallVector<Decl *, 8> DeclsInGroup; 1706 for (unsigned i = 0; i != NumElts; ++i) { 1707 // Check for another declaration kind with the same name. 1708 NamedDecl *PrevDecl 1709 = LookupSingleName(TUScope, IdentList[i], IdentLocs[i], 1710 LookupOrdinaryName, ForRedeclaration); 1711 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1712 // Maybe we will complain about the shadowed template parameter. 1713 DiagnoseTemplateParameterShadow(AtClassLoc, PrevDecl); 1714 // Just pretend that we didn't see the previous declaration. 1715 PrevDecl = 0; 1716 } 1717 1718 if (PrevDecl && !isa<ObjCInterfaceDecl>(PrevDecl)) { 1719 // GCC apparently allows the following idiom: 1720 // 1721 // typedef NSObject < XCElementTogglerP > XCElementToggler; 1722 // @class XCElementToggler; 1723 // 1724 // FIXME: Make an extension? 1725 TypedefNameDecl *TDD = dyn_cast<TypedefNameDecl>(PrevDecl); 1726 if (!TDD || !TDD->getUnderlyingType()->isObjCObjectType()) { 1727 Diag(AtClassLoc, diag::err_redefinition_different_kind) << IdentList[i]; 1728 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 1729 } else { 1730 // a forward class declaration matching a typedef name of a class refers 1731 // to the underlying class. 1732 if (const ObjCObjectType *OI = 1733 TDD->getUnderlyingType()->getAs<ObjCObjectType>()) 1734 PrevDecl = OI->getInterface(); 1735 } 1736 } 1737 ObjCInterfaceDecl *IDecl = dyn_cast_or_null<ObjCInterfaceDecl>(PrevDecl); 1738 if (!IDecl) { // Not already seen? Make a forward decl. 1739 IDecl = ObjCInterfaceDecl::Create(Context, CurContext, AtClassLoc, 1740 IdentList[i], IdentLocs[i], true); 1741 1742 // Push the ObjCInterfaceDecl on the scope chain but do *not* add it to 1743 // the current DeclContext. This prevents clients that walk DeclContext 1744 // from seeing the imaginary ObjCInterfaceDecl until it is actually 1745 // declared later (if at all). We also take care to explicitly make 1746 // sure this declaration is visible for name lookup. 1747 PushOnScopeChains(IDecl, TUScope, false); 1748 CurContext->makeDeclVisibleInContext(IDecl, true); 1749 } 1750 ObjCClassDecl *CDecl = ObjCClassDecl::Create(Context, CurContext, AtClassLoc, 1751 IDecl, IdentLocs[i]); 1752 CurContext->addDecl(CDecl); 1753 CheckObjCDeclScope(CDecl); 1754 DeclsInGroup.push_back(CDecl); 1755 } 1756 1757 return BuildDeclaratorGroup(DeclsInGroup.data(), DeclsInGroup.size(), false); 1758} 1759 1760static bool tryMatchRecordTypes(ASTContext &Context, 1761 Sema::MethodMatchStrategy strategy, 1762 const Type *left, const Type *right); 1763 1764static bool matchTypes(ASTContext &Context, Sema::MethodMatchStrategy strategy, 1765 QualType leftQT, QualType rightQT) { 1766 const Type *left = 1767 Context.getCanonicalType(leftQT).getUnqualifiedType().getTypePtr(); 1768 const Type *right = 1769 Context.getCanonicalType(rightQT).getUnqualifiedType().getTypePtr(); 1770 1771 if (left == right) return true; 1772 1773 // If we're doing a strict match, the types have to match exactly. 1774 if (strategy == Sema::MMS_strict) return false; 1775 1776 if (left->isIncompleteType() || right->isIncompleteType()) return false; 1777 1778 // Otherwise, use this absurdly complicated algorithm to try to 1779 // validate the basic, low-level compatibility of the two types. 1780 1781 // As a minimum, require the sizes and alignments to match. 1782 if (Context.getTypeInfo(left) != Context.getTypeInfo(right)) 1783 return false; 1784 1785 // Consider all the kinds of non-dependent canonical types: 1786 // - functions and arrays aren't possible as return and parameter types 1787 1788 // - vector types of equal size can be arbitrarily mixed 1789 if (isa<VectorType>(left)) return isa<VectorType>(right); 1790 if (isa<VectorType>(right)) return false; 1791 1792 // - references should only match references of identical type 1793 // - structs, unions, and Objective-C objects must match more-or-less 1794 // exactly 1795 // - everything else should be a scalar 1796 if (!left->isScalarType() || !right->isScalarType()) 1797 return tryMatchRecordTypes(Context, strategy, left, right); 1798 1799 // Make scalars agree in kind, except count bools as chars, and group 1800 // all non-member pointers together. 1801 Type::ScalarTypeKind leftSK = left->getScalarTypeKind(); 1802 Type::ScalarTypeKind rightSK = right->getScalarTypeKind(); 1803 if (leftSK == Type::STK_Bool) leftSK = Type::STK_Integral; 1804 if (rightSK == Type::STK_Bool) rightSK = Type::STK_Integral; 1805 if (leftSK == Type::STK_CPointer || leftSK == Type::STK_BlockPointer) 1806 leftSK = Type::STK_ObjCObjectPointer; 1807 if (rightSK == Type::STK_CPointer || rightSK == Type::STK_BlockPointer) 1808 rightSK = Type::STK_ObjCObjectPointer; 1809 1810 // Note that data member pointers and function member pointers don't 1811 // intermix because of the size differences. 1812 1813 return (leftSK == rightSK); 1814} 1815 1816static bool tryMatchRecordTypes(ASTContext &Context, 1817 Sema::MethodMatchStrategy strategy, 1818 const Type *lt, const Type *rt) { 1819 assert(lt && rt && lt != rt); 1820 1821 if (!isa<RecordType>(lt) || !isa<RecordType>(rt)) return false; 1822 RecordDecl *left = cast<RecordType>(lt)->getDecl(); 1823 RecordDecl *right = cast<RecordType>(rt)->getDecl(); 1824 1825 // Require union-hood to match. 1826 if (left->isUnion() != right->isUnion()) return false; 1827 1828 // Require an exact match if either is non-POD. 1829 if ((isa<CXXRecordDecl>(left) && !cast<CXXRecordDecl>(left)->isPOD()) || 1830 (isa<CXXRecordDecl>(right) && !cast<CXXRecordDecl>(right)->isPOD())) 1831 return false; 1832 1833 // Require size and alignment to match. 1834 if (Context.getTypeInfo(lt) != Context.getTypeInfo(rt)) return false; 1835 1836 // Require fields to match. 1837 RecordDecl::field_iterator li = left->field_begin(), le = left->field_end(); 1838 RecordDecl::field_iterator ri = right->field_begin(), re = right->field_end(); 1839 for (; li != le && ri != re; ++li, ++ri) { 1840 if (!matchTypes(Context, strategy, li->getType(), ri->getType())) 1841 return false; 1842 } 1843 return (li == le && ri == re); 1844} 1845 1846/// MatchTwoMethodDeclarations - Checks that two methods have matching type and 1847/// returns true, or false, accordingly. 1848/// TODO: Handle protocol list; such as id<p1,p2> in type comparisons 1849bool Sema::MatchTwoMethodDeclarations(const ObjCMethodDecl *left, 1850 const ObjCMethodDecl *right, 1851 MethodMatchStrategy strategy) { 1852 if (!matchTypes(Context, strategy, 1853 left->getResultType(), right->getResultType())) 1854 return false; 1855 1856 if (getLangOptions().ObjCAutoRefCount && 1857 (left->hasAttr<NSReturnsRetainedAttr>() 1858 != right->hasAttr<NSReturnsRetainedAttr>() || 1859 left->hasAttr<NSConsumesSelfAttr>() 1860 != right->hasAttr<NSConsumesSelfAttr>())) 1861 return false; 1862 1863 ObjCMethodDecl::param_iterator 1864 li = left->param_begin(), le = left->param_end(), ri = right->param_begin(); 1865 1866 for (; li != le; ++li, ++ri) { 1867 assert(ri != right->param_end() && "Param mismatch"); 1868 ParmVarDecl *lparm = *li, *rparm = *ri; 1869 1870 if (!matchTypes(Context, strategy, lparm->getType(), rparm->getType())) 1871 return false; 1872 1873 if (getLangOptions().ObjCAutoRefCount && 1874 lparm->hasAttr<NSConsumedAttr>() != rparm->hasAttr<NSConsumedAttr>()) 1875 return false; 1876 } 1877 return true; 1878} 1879 1880/// \brief Read the contents of the method pool for a given selector from 1881/// external storage. 1882/// 1883/// This routine should only be called once, when the method pool has no entry 1884/// for this selector. 1885Sema::GlobalMethodPool::iterator Sema::ReadMethodPool(Selector Sel) { 1886 assert(ExternalSource && "We need an external AST source"); 1887 assert(MethodPool.find(Sel) == MethodPool.end() && 1888 "Selector data already loaded into the method pool"); 1889 1890 // Read the method list from the external source. 1891 GlobalMethods Methods = ExternalSource->ReadMethodPool(Sel); 1892 1893 return MethodPool.insert(std::make_pair(Sel, Methods)).first; 1894} 1895 1896void Sema::AddMethodToGlobalPool(ObjCMethodDecl *Method, bool impl, 1897 bool instance) { 1898 GlobalMethodPool::iterator Pos = MethodPool.find(Method->getSelector()); 1899 if (Pos == MethodPool.end()) { 1900 if (ExternalSource) 1901 Pos = ReadMethodPool(Method->getSelector()); 1902 else 1903 Pos = MethodPool.insert(std::make_pair(Method->getSelector(), 1904 GlobalMethods())).first; 1905 } 1906 Method->setDefined(impl); 1907 ObjCMethodList &Entry = instance ? Pos->second.first : Pos->second.second; 1908 if (Entry.Method == 0) { 1909 // Haven't seen a method with this selector name yet - add it. 1910 Entry.Method = Method; 1911 Entry.Next = 0; 1912 return; 1913 } 1914 1915 // We've seen a method with this name, see if we have already seen this type 1916 // signature. 1917 for (ObjCMethodList *List = &Entry; List; List = List->Next) { 1918 bool match = MatchTwoMethodDeclarations(Method, List->Method); 1919 1920 if (match) { 1921 ObjCMethodDecl *PrevObjCMethod = List->Method; 1922 PrevObjCMethod->setDefined(impl); 1923 // If a method is deprecated, push it in the global pool. 1924 // This is used for better diagnostics. 1925 if (Method->isDeprecated()) { 1926 if (!PrevObjCMethod->isDeprecated()) 1927 List->Method = Method; 1928 } 1929 // If new method is unavailable, push it into global pool 1930 // unless previous one is deprecated. 1931 if (Method->isUnavailable()) { 1932 if (PrevObjCMethod->getAvailability() < AR_Deprecated) 1933 List->Method = Method; 1934 } 1935 return; 1936 } 1937 } 1938 1939 // We have a new signature for an existing method - add it. 1940 // This is extremely rare. Only 1% of Cocoa selectors are "overloaded". 1941 ObjCMethodList *Mem = BumpAlloc.Allocate<ObjCMethodList>(); 1942 Entry.Next = new (Mem) ObjCMethodList(Method, Entry.Next); 1943} 1944 1945/// Determines if this is an "acceptable" loose mismatch in the global 1946/// method pool. This exists mostly as a hack to get around certain 1947/// global mismatches which we can't afford to make warnings / errors. 1948/// Really, what we want is a way to take a method out of the global 1949/// method pool. 1950static bool isAcceptableMethodMismatch(ObjCMethodDecl *chosen, 1951 ObjCMethodDecl *other) { 1952 if (!chosen->isInstanceMethod()) 1953 return false; 1954 1955 Selector sel = chosen->getSelector(); 1956 if (!sel.isUnarySelector() || sel.getNameForSlot(0) != "length") 1957 return false; 1958 1959 // Don't complain about mismatches for -length if the method we 1960 // chose has an integral result type. 1961 return (chosen->getResultType()->isIntegerType()); 1962} 1963 1964ObjCMethodDecl *Sema::LookupMethodInGlobalPool(Selector Sel, SourceRange R, 1965 bool receiverIdOrClass, 1966 bool warn, bool instance) { 1967 GlobalMethodPool::iterator Pos = MethodPool.find(Sel); 1968 if (Pos == MethodPool.end()) { 1969 if (ExternalSource) 1970 Pos = ReadMethodPool(Sel); 1971 else 1972 return 0; 1973 } 1974 1975 ObjCMethodList &MethList = instance ? Pos->second.first : Pos->second.second; 1976 1977 if (warn && MethList.Method && MethList.Next) { 1978 bool issueDiagnostic = false, issueError = false; 1979 1980 // We support a warning which complains about *any* difference in 1981 // method signature. 1982 bool strictSelectorMatch = 1983 (receiverIdOrClass && warn && 1984 (Diags.getDiagnosticLevel(diag::warn_strict_multiple_method_decl, 1985 R.getBegin()) != 1986 DiagnosticsEngine::Ignored)); 1987 if (strictSelectorMatch) 1988 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) { 1989 if (!MatchTwoMethodDeclarations(MethList.Method, Next->Method, 1990 MMS_strict)) { 1991 issueDiagnostic = true; 1992 break; 1993 } 1994 } 1995 1996 // If we didn't see any strict differences, we won't see any loose 1997 // differences. In ARC, however, we also need to check for loose 1998 // mismatches, because most of them are errors. 1999 if (!strictSelectorMatch || 2000 (issueDiagnostic && getLangOptions().ObjCAutoRefCount)) 2001 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) { 2002 // This checks if the methods differ in type mismatch. 2003 if (!MatchTwoMethodDeclarations(MethList.Method, Next->Method, 2004 MMS_loose) && 2005 !isAcceptableMethodMismatch(MethList.Method, Next->Method)) { 2006 issueDiagnostic = true; 2007 if (getLangOptions().ObjCAutoRefCount) 2008 issueError = true; 2009 break; 2010 } 2011 } 2012 2013 if (issueDiagnostic) { 2014 if (issueError) 2015 Diag(R.getBegin(), diag::err_arc_multiple_method_decl) << Sel << R; 2016 else if (strictSelectorMatch) 2017 Diag(R.getBegin(), diag::warn_strict_multiple_method_decl) << Sel << R; 2018 else 2019 Diag(R.getBegin(), diag::warn_multiple_method_decl) << Sel << R; 2020 2021 Diag(MethList.Method->getLocStart(), 2022 issueError ? diag::note_possibility : diag::note_using) 2023 << MethList.Method->getSourceRange(); 2024 for (ObjCMethodList *Next = MethList.Next; Next; Next = Next->Next) 2025 Diag(Next->Method->getLocStart(), diag::note_also_found) 2026 << Next->Method->getSourceRange(); 2027 } 2028 } 2029 return MethList.Method; 2030} 2031 2032ObjCMethodDecl *Sema::LookupImplementedMethodInGlobalPool(Selector Sel) { 2033 GlobalMethodPool::iterator Pos = MethodPool.find(Sel); 2034 if (Pos == MethodPool.end()) 2035 return 0; 2036 2037 GlobalMethods &Methods = Pos->second; 2038 2039 if (Methods.first.Method && Methods.first.Method->isDefined()) 2040 return Methods.first.Method; 2041 if (Methods.second.Method && Methods.second.Method->isDefined()) 2042 return Methods.second.Method; 2043 return 0; 2044} 2045 2046/// CompareMethodParamsInBaseAndSuper - This routine compares methods with 2047/// identical selector names in current and its super classes and issues 2048/// a warning if any of their argument types are incompatible. 2049void Sema::CompareMethodParamsInBaseAndSuper(Decl *ClassDecl, 2050 ObjCMethodDecl *Method, 2051 bool IsInstance) { 2052 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(ClassDecl); 2053 if (ID == 0) return; 2054 2055 while (ObjCInterfaceDecl *SD = ID->getSuperClass()) { 2056 ObjCMethodDecl *SuperMethodDecl = 2057 SD->lookupMethod(Method->getSelector(), IsInstance); 2058 if (SuperMethodDecl == 0) { 2059 ID = SD; 2060 continue; 2061 } 2062 ObjCMethodDecl::param_iterator ParamI = Method->param_begin(), 2063 E = Method->param_end(); 2064 ObjCMethodDecl::param_iterator PrevI = SuperMethodDecl->param_begin(); 2065 for (; ParamI != E; ++ParamI, ++PrevI) { 2066 // Number of parameters are the same and is guaranteed by selector match. 2067 assert(PrevI != SuperMethodDecl->param_end() && "Param mismatch"); 2068 QualType T1 = Context.getCanonicalType((*ParamI)->getType()); 2069 QualType T2 = Context.getCanonicalType((*PrevI)->getType()); 2070 // If type of argument of method in this class does not match its 2071 // respective argument type in the super class method, issue warning; 2072 if (!Context.typesAreCompatible(T1, T2)) { 2073 Diag((*ParamI)->getLocation(), diag::ext_typecheck_base_super) 2074 << T1 << T2; 2075 Diag(SuperMethodDecl->getLocation(), diag::note_previous_declaration); 2076 return; 2077 } 2078 } 2079 ID = SD; 2080 } 2081} 2082 2083/// DiagnoseDuplicateIvars - 2084/// Check for duplicate ivars in the entire class at the start of 2085/// @implementation. This becomes necesssary because class extension can 2086/// add ivars to a class in random order which will not be known until 2087/// class's @implementation is seen. 2088void Sema::DiagnoseDuplicateIvars(ObjCInterfaceDecl *ID, 2089 ObjCInterfaceDecl *SID) { 2090 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 2091 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 2092 ObjCIvarDecl* Ivar = (*IVI); 2093 if (Ivar->isInvalidDecl()) 2094 continue; 2095 if (IdentifierInfo *II = Ivar->getIdentifier()) { 2096 ObjCIvarDecl* prevIvar = SID->lookupInstanceVariable(II); 2097 if (prevIvar) { 2098 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 2099 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 2100 Ivar->setInvalidDecl(); 2101 } 2102 } 2103 } 2104} 2105 2106// Note: For class/category implemenations, allMethods/allProperties is 2107// always null. 2108void Sema::ActOnAtEnd(Scope *S, SourceRange AtEnd, 2109 Decl **allMethods, unsigned allNum, 2110 Decl **allProperties, unsigned pNum, 2111 DeclGroupPtrTy *allTUVars, unsigned tuvNum) { 2112 2113 if (!CurContext->isObjCContainer()) 2114 return; 2115 ObjCContainerDecl *OCD = dyn_cast<ObjCContainerDecl>(CurContext); 2116 Decl *ClassDecl = cast<Decl>(OCD); 2117 2118 bool isInterfaceDeclKind = 2119 isa<ObjCInterfaceDecl>(ClassDecl) || isa<ObjCCategoryDecl>(ClassDecl) 2120 || isa<ObjCProtocolDecl>(ClassDecl); 2121 bool checkIdenticalMethods = isa<ObjCImplementationDecl>(ClassDecl); 2122 2123 if (!isInterfaceDeclKind && AtEnd.isInvalid()) { 2124 // FIXME: This is wrong. We shouldn't be pretending that there is 2125 // an '@end' in the declaration. 2126 SourceLocation L = ClassDecl->getLocation(); 2127 AtEnd.setBegin(L); 2128 AtEnd.setEnd(L); 2129 Diag(L, diag::err_missing_atend); 2130 } 2131 2132 // FIXME: Remove these and use the ObjCContainerDecl/DeclContext. 2133 llvm::DenseMap<Selector, const ObjCMethodDecl*> InsMap; 2134 llvm::DenseMap<Selector, const ObjCMethodDecl*> ClsMap; 2135 2136 for (unsigned i = 0; i < allNum; i++ ) { 2137 ObjCMethodDecl *Method = 2138 cast_or_null<ObjCMethodDecl>(allMethods[i]); 2139 2140 if (!Method) continue; // Already issued a diagnostic. 2141 if (Method->isInstanceMethod()) { 2142 /// Check for instance method of the same name with incompatible types 2143 const ObjCMethodDecl *&PrevMethod = InsMap[Method->getSelector()]; 2144 bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod) 2145 : false; 2146 if ((isInterfaceDeclKind && PrevMethod && !match) 2147 || (checkIdenticalMethods && match)) { 2148 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 2149 << Method->getDeclName(); 2150 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 2151 Method->setInvalidDecl(); 2152 } else { 2153 InsMap[Method->getSelector()] = Method; 2154 /// The following allows us to typecheck messages to "id". 2155 AddInstanceMethodToGlobalPool(Method); 2156 // verify that the instance method conforms to the same definition of 2157 // parent methods if it shadows one. 2158 CompareMethodParamsInBaseAndSuper(ClassDecl, Method, true); 2159 } 2160 } else { 2161 /// Check for class method of the same name with incompatible types 2162 const ObjCMethodDecl *&PrevMethod = ClsMap[Method->getSelector()]; 2163 bool match = PrevMethod ? MatchTwoMethodDeclarations(Method, PrevMethod) 2164 : false; 2165 if ((isInterfaceDeclKind && PrevMethod && !match) 2166 || (checkIdenticalMethods && match)) { 2167 Diag(Method->getLocation(), diag::err_duplicate_method_decl) 2168 << Method->getDeclName(); 2169 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 2170 Method->setInvalidDecl(); 2171 } else { 2172 ClsMap[Method->getSelector()] = Method; 2173 /// The following allows us to typecheck messages to "Class". 2174 AddFactoryMethodToGlobalPool(Method); 2175 // verify that the class method conforms to the same definition of 2176 // parent methods if it shadows one. 2177 CompareMethodParamsInBaseAndSuper(ClassDecl, Method, false); 2178 } 2179 } 2180 } 2181 if (ObjCInterfaceDecl *I = dyn_cast<ObjCInterfaceDecl>(ClassDecl)) { 2182 // Compares properties declared in this class to those of its 2183 // super class. 2184 ComparePropertiesInBaseAndSuper(I); 2185 CompareProperties(I, I); 2186 } else if (ObjCCategoryDecl *C = dyn_cast<ObjCCategoryDecl>(ClassDecl)) { 2187 // Categories are used to extend the class by declaring new methods. 2188 // By the same token, they are also used to add new properties. No 2189 // need to compare the added property to those in the class. 2190 2191 // Compare protocol properties with those in category 2192 CompareProperties(C, C); 2193 if (C->IsClassExtension()) { 2194 ObjCInterfaceDecl *CCPrimary = C->getClassInterface(); 2195 DiagnoseClassExtensionDupMethods(C, CCPrimary); 2196 } 2197 } 2198 if (ObjCContainerDecl *CDecl = dyn_cast<ObjCContainerDecl>(ClassDecl)) { 2199 if (CDecl->getIdentifier()) 2200 // ProcessPropertyDecl is responsible for diagnosing conflicts with any 2201 // user-defined setter/getter. It also synthesizes setter/getter methods 2202 // and adds them to the DeclContext and global method pools. 2203 for (ObjCContainerDecl::prop_iterator I = CDecl->prop_begin(), 2204 E = CDecl->prop_end(); 2205 I != E; ++I) 2206 ProcessPropertyDecl(*I, CDecl); 2207 CDecl->setAtEndRange(AtEnd); 2208 } 2209 if (ObjCImplementationDecl *IC=dyn_cast<ObjCImplementationDecl>(ClassDecl)) { 2210 IC->setAtEndRange(AtEnd); 2211 if (ObjCInterfaceDecl* IDecl = IC->getClassInterface()) { 2212 // Any property declared in a class extension might have user 2213 // declared setter or getter in current class extension or one 2214 // of the other class extensions. Mark them as synthesized as 2215 // property will be synthesized when property with same name is 2216 // seen in the @implementation. 2217 for (const ObjCCategoryDecl *ClsExtDecl = 2218 IDecl->getFirstClassExtension(); 2219 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 2220 for (ObjCContainerDecl::prop_iterator I = ClsExtDecl->prop_begin(), 2221 E = ClsExtDecl->prop_end(); I != E; ++I) { 2222 ObjCPropertyDecl *Property = (*I); 2223 // Skip over properties declared @dynamic 2224 if (const ObjCPropertyImplDecl *PIDecl 2225 = IC->FindPropertyImplDecl(Property->getIdentifier())) 2226 if (PIDecl->getPropertyImplementation() 2227 == ObjCPropertyImplDecl::Dynamic) 2228 continue; 2229 2230 for (const ObjCCategoryDecl *CExtDecl = 2231 IDecl->getFirstClassExtension(); 2232 CExtDecl; CExtDecl = CExtDecl->getNextClassExtension()) { 2233 if (ObjCMethodDecl *GetterMethod = 2234 CExtDecl->getInstanceMethod(Property->getGetterName())) 2235 GetterMethod->setSynthesized(true); 2236 if (!Property->isReadOnly()) 2237 if (ObjCMethodDecl *SetterMethod = 2238 CExtDecl->getInstanceMethod(Property->getSetterName())) 2239 SetterMethod->setSynthesized(true); 2240 } 2241 } 2242 } 2243 ImplMethodsVsClassMethods(S, IC, IDecl); 2244 AtomicPropertySetterGetterRules(IC, IDecl); 2245 DiagnoseOwningPropertyGetterSynthesis(IC); 2246 2247 if (LangOpts.ObjCNonFragileABI2) 2248 while (IDecl->getSuperClass()) { 2249 DiagnoseDuplicateIvars(IDecl, IDecl->getSuperClass()); 2250 IDecl = IDecl->getSuperClass(); 2251 } 2252 } 2253 SetIvarInitializers(IC); 2254 } else if (ObjCCategoryImplDecl* CatImplClass = 2255 dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) { 2256 CatImplClass->setAtEndRange(AtEnd); 2257 2258 // Find category interface decl and then check that all methods declared 2259 // in this interface are implemented in the category @implementation. 2260 if (ObjCInterfaceDecl* IDecl = CatImplClass->getClassInterface()) { 2261 for (ObjCCategoryDecl *Categories = IDecl->getCategoryList(); 2262 Categories; Categories = Categories->getNextClassCategory()) { 2263 if (Categories->getIdentifier() == CatImplClass->getIdentifier()) { 2264 ImplMethodsVsClassMethods(S, CatImplClass, Categories); 2265 break; 2266 } 2267 } 2268 } 2269 } 2270 if (isInterfaceDeclKind) { 2271 // Reject invalid vardecls. 2272 for (unsigned i = 0; i != tuvNum; i++) { 2273 DeclGroupRef DG = allTUVars[i].getAsVal<DeclGroupRef>(); 2274 for (DeclGroupRef::iterator I = DG.begin(), E = DG.end(); I != E; ++I) 2275 if (VarDecl *VDecl = dyn_cast<VarDecl>(*I)) { 2276 if (!VDecl->hasExternalStorage()) 2277 Diag(VDecl->getLocation(), diag::err_objc_var_decl_inclass); 2278 } 2279 } 2280 } 2281 ActOnObjCContainerFinishDefinition(); 2282} 2283 2284 2285/// CvtQTToAstBitMask - utility routine to produce an AST bitmask for 2286/// objective-c's type qualifier from the parser version of the same info. 2287static Decl::ObjCDeclQualifier 2288CvtQTToAstBitMask(ObjCDeclSpec::ObjCDeclQualifier PQTVal) { 2289 return (Decl::ObjCDeclQualifier) (unsigned) PQTVal; 2290} 2291 2292static inline 2293bool containsInvalidMethodImplAttribute(const AttrVec &A) { 2294 // The 'ibaction' attribute is allowed on method definitions because of 2295 // how the IBAction macro is used on both method declarations and definitions. 2296 // If the method definitions contains any other attributes, return true. 2297 for (AttrVec::const_iterator i = A.begin(), e = A.end(); i != e; ++i) 2298 if ((*i)->getKind() != attr::IBAction) 2299 return true; 2300 return false; 2301} 2302 2303namespace { 2304 /// \brief Describes the compatibility of a result type with its method. 2305 enum ResultTypeCompatibilityKind { 2306 RTC_Compatible, 2307 RTC_Incompatible, 2308 RTC_Unknown 2309 }; 2310} 2311 2312/// \brief Check whether the declared result type of the given Objective-C 2313/// method declaration is compatible with the method's class. 2314/// 2315static ResultTypeCompatibilityKind 2316CheckRelatedResultTypeCompatibility(Sema &S, ObjCMethodDecl *Method, 2317 ObjCInterfaceDecl *CurrentClass) { 2318 QualType ResultType = Method->getResultType(); 2319 2320 // If an Objective-C method inherits its related result type, then its 2321 // declared result type must be compatible with its own class type. The 2322 // declared result type is compatible if: 2323 if (const ObjCObjectPointerType *ResultObjectType 2324 = ResultType->getAs<ObjCObjectPointerType>()) { 2325 // - it is id or qualified id, or 2326 if (ResultObjectType->isObjCIdType() || 2327 ResultObjectType->isObjCQualifiedIdType()) 2328 return RTC_Compatible; 2329 2330 if (CurrentClass) { 2331 if (ObjCInterfaceDecl *ResultClass 2332 = ResultObjectType->getInterfaceDecl()) { 2333 // - it is the same as the method's class type, or 2334 if (CurrentClass == ResultClass) 2335 return RTC_Compatible; 2336 2337 // - it is a superclass of the method's class type 2338 if (ResultClass->isSuperClassOf(CurrentClass)) 2339 return RTC_Compatible; 2340 } 2341 } else { 2342 // Any Objective-C pointer type might be acceptable for a protocol 2343 // method; we just don't know. 2344 return RTC_Unknown; 2345 } 2346 } 2347 2348 return RTC_Incompatible; 2349} 2350 2351namespace { 2352/// A helper class for searching for methods which a particular method 2353/// overrides. 2354class OverrideSearch { 2355 Sema &S; 2356 ObjCMethodDecl *Method; 2357 llvm::SmallPtrSet<ObjCContainerDecl*, 8> Searched; 2358 llvm::SmallPtrSet<ObjCMethodDecl*, 8> Overridden; 2359 bool Recursive; 2360 2361public: 2362 OverrideSearch(Sema &S, ObjCMethodDecl *method) : S(S), Method(method) { 2363 Selector selector = method->getSelector(); 2364 2365 // Bypass this search if we've never seen an instance/class method 2366 // with this selector before. 2367 Sema::GlobalMethodPool::iterator it = S.MethodPool.find(selector); 2368 if (it == S.MethodPool.end()) { 2369 if (!S.ExternalSource) return; 2370 it = S.ReadMethodPool(selector); 2371 } 2372 ObjCMethodList &list = 2373 method->isInstanceMethod() ? it->second.first : it->second.second; 2374 if (!list.Method) return; 2375 2376 ObjCContainerDecl *container 2377 = cast<ObjCContainerDecl>(method->getDeclContext()); 2378 2379 // Prevent the search from reaching this container again. This is 2380 // important with categories, which override methods from the 2381 // interface and each other. 2382 Searched.insert(container); 2383 searchFromContainer(container); 2384 } 2385 2386 typedef llvm::SmallPtrSet<ObjCMethodDecl*,8>::iterator iterator; 2387 iterator begin() const { return Overridden.begin(); } 2388 iterator end() const { return Overridden.end(); } 2389 2390private: 2391 void searchFromContainer(ObjCContainerDecl *container) { 2392 if (container->isInvalidDecl()) return; 2393 2394 switch (container->getDeclKind()) { 2395#define OBJCCONTAINER(type, base) \ 2396 case Decl::type: \ 2397 searchFrom(cast<type##Decl>(container)); \ 2398 break; 2399#define ABSTRACT_DECL(expansion) 2400#define DECL(type, base) \ 2401 case Decl::type: 2402#include "clang/AST/DeclNodes.inc" 2403 llvm_unreachable("not an ObjC container!"); 2404 } 2405 } 2406 2407 void searchFrom(ObjCProtocolDecl *protocol) { 2408 // A method in a protocol declaration overrides declarations from 2409 // referenced ("parent") protocols. 2410 search(protocol->getReferencedProtocols()); 2411 } 2412 2413 void searchFrom(ObjCCategoryDecl *category) { 2414 // A method in a category declaration overrides declarations from 2415 // the main class and from protocols the category references. 2416 search(category->getClassInterface()); 2417 search(category->getReferencedProtocols()); 2418 } 2419 2420 void searchFrom(ObjCCategoryImplDecl *impl) { 2421 // A method in a category definition that has a category 2422 // declaration overrides declarations from the category 2423 // declaration. 2424 if (ObjCCategoryDecl *category = impl->getCategoryDecl()) { 2425 search(category); 2426 2427 // Otherwise it overrides declarations from the class. 2428 } else { 2429 search(impl->getClassInterface()); 2430 } 2431 } 2432 2433 void searchFrom(ObjCInterfaceDecl *iface) { 2434 // A method in a class declaration overrides declarations from 2435 2436 // - categories, 2437 for (ObjCCategoryDecl *category = iface->getCategoryList(); 2438 category; category = category->getNextClassCategory()) 2439 search(category); 2440 2441 // - the super class, and 2442 if (ObjCInterfaceDecl *super = iface->getSuperClass()) 2443 search(super); 2444 2445 // - any referenced protocols. 2446 search(iface->getReferencedProtocols()); 2447 } 2448 2449 void searchFrom(ObjCImplementationDecl *impl) { 2450 // A method in a class implementation overrides declarations from 2451 // the class interface. 2452 search(impl->getClassInterface()); 2453 } 2454 2455 2456 void search(const ObjCProtocolList &protocols) { 2457 for (ObjCProtocolList::iterator i = protocols.begin(), e = protocols.end(); 2458 i != e; ++i) 2459 search(*i); 2460 } 2461 2462 void search(ObjCContainerDecl *container) { 2463 // Abort if we've already searched this container. 2464 if (!Searched.insert(container)) return; 2465 2466 // Check for a method in this container which matches this selector. 2467 ObjCMethodDecl *meth = container->getMethod(Method->getSelector(), 2468 Method->isInstanceMethod()); 2469 2470 // If we find one, record it and bail out. 2471 if (meth) { 2472 Overridden.insert(meth); 2473 return; 2474 } 2475 2476 // Otherwise, search for methods that a hypothetical method here 2477 // would have overridden. 2478 2479 // Note that we're now in a recursive case. 2480 Recursive = true; 2481 2482 searchFromContainer(container); 2483 } 2484}; 2485} 2486 2487Decl *Sema::ActOnMethodDeclaration( 2488 Scope *S, 2489 SourceLocation MethodLoc, SourceLocation EndLoc, 2490 tok::TokenKind MethodType, 2491 ObjCDeclSpec &ReturnQT, ParsedType ReturnType, 2492 SourceLocation SelectorStartLoc, 2493 Selector Sel, 2494 // optional arguments. The number of types/arguments is obtained 2495 // from the Sel.getNumArgs(). 2496 ObjCArgInfo *ArgInfo, 2497 DeclaratorChunk::ParamInfo *CParamInfo, unsigned CNumArgs, // c-style args 2498 AttributeList *AttrList, tok::ObjCKeywordKind MethodDeclKind, 2499 bool isVariadic, bool MethodDefinition) { 2500 // Make sure we can establish a context for the method. 2501 if (!CurContext->isObjCContainer()) { 2502 Diag(MethodLoc, diag::error_missing_method_context); 2503 return 0; 2504 } 2505 ObjCContainerDecl *OCD = dyn_cast<ObjCContainerDecl>(CurContext); 2506 Decl *ClassDecl = cast<Decl>(OCD); 2507 QualType resultDeclType; 2508 2509 bool HasRelatedResultType = false; 2510 TypeSourceInfo *ResultTInfo = 0; 2511 if (ReturnType) { 2512 resultDeclType = GetTypeFromParser(ReturnType, &ResultTInfo); 2513 2514 // Methods cannot return interface types. All ObjC objects are 2515 // passed by reference. 2516 if (resultDeclType->isObjCObjectType()) { 2517 Diag(MethodLoc, diag::err_object_cannot_be_passed_returned_by_value) 2518 << 0 << resultDeclType; 2519 return 0; 2520 } 2521 2522 HasRelatedResultType = (resultDeclType == Context.getObjCInstanceType()); 2523 } else { // get the type for "id". 2524 resultDeclType = Context.getObjCIdType(); 2525 Diag(MethodLoc, diag::warn_missing_method_return_type) 2526 << FixItHint::CreateInsertion(SelectorStartLoc, "(id)"); 2527 } 2528 2529 ObjCMethodDecl* ObjCMethod = 2530 ObjCMethodDecl::Create(Context, MethodLoc, EndLoc, Sel, resultDeclType, 2531 ResultTInfo, 2532 CurContext, 2533 MethodType == tok::minus, isVariadic, 2534 /*isSynthesized=*/false, 2535 /*isImplicitlyDeclared=*/false, /*isDefined=*/false, 2536 MethodDeclKind == tok::objc_optional 2537 ? ObjCMethodDecl::Optional 2538 : ObjCMethodDecl::Required, 2539 HasRelatedResultType); 2540 2541 SmallVector<ParmVarDecl*, 16> Params; 2542 2543 for (unsigned i = 0, e = Sel.getNumArgs(); i != e; ++i) { 2544 QualType ArgType; 2545 TypeSourceInfo *DI; 2546 2547 if (ArgInfo[i].Type == 0) { 2548 ArgType = Context.getObjCIdType(); 2549 DI = 0; 2550 } else { 2551 ArgType = GetTypeFromParser(ArgInfo[i].Type, &DI); 2552 // Perform the default array/function conversions (C99 6.7.5.3p[7,8]). 2553 ArgType = Context.getAdjustedParameterType(ArgType); 2554 } 2555 2556 LookupResult R(*this, ArgInfo[i].Name, ArgInfo[i].NameLoc, 2557 LookupOrdinaryName, ForRedeclaration); 2558 LookupName(R, S); 2559 if (R.isSingleResult()) { 2560 NamedDecl *PrevDecl = R.getFoundDecl(); 2561 if (S->isDeclScope(PrevDecl)) { 2562 Diag(ArgInfo[i].NameLoc, 2563 (MethodDefinition ? diag::warn_method_param_redefinition 2564 : diag::warn_method_param_declaration)) 2565 << ArgInfo[i].Name; 2566 Diag(PrevDecl->getLocation(), 2567 diag::note_previous_declaration); 2568 } 2569 } 2570 2571 SourceLocation StartLoc = DI 2572 ? DI->getTypeLoc().getBeginLoc() 2573 : ArgInfo[i].NameLoc; 2574 2575 ParmVarDecl* Param = CheckParameter(ObjCMethod, StartLoc, 2576 ArgInfo[i].NameLoc, ArgInfo[i].Name, 2577 ArgType, DI, SC_None, SC_None); 2578 2579 Param->setObjCMethodScopeInfo(i); 2580 2581 Param->setObjCDeclQualifier( 2582 CvtQTToAstBitMask(ArgInfo[i].DeclSpec.getObjCDeclQualifier())); 2583 2584 // Apply the attributes to the parameter. 2585 ProcessDeclAttributeList(TUScope, Param, ArgInfo[i].ArgAttrs); 2586 2587 S->AddDecl(Param); 2588 IdResolver.AddDecl(Param); 2589 2590 Params.push_back(Param); 2591 } 2592 2593 for (unsigned i = 0, e = CNumArgs; i != e; ++i) { 2594 ParmVarDecl *Param = cast<ParmVarDecl>(CParamInfo[i].Param); 2595 QualType ArgType = Param->getType(); 2596 if (ArgType.isNull()) 2597 ArgType = Context.getObjCIdType(); 2598 else 2599 // Perform the default array/function conversions (C99 6.7.5.3p[7,8]). 2600 ArgType = Context.getAdjustedParameterType(ArgType); 2601 if (ArgType->isObjCObjectType()) { 2602 Diag(Param->getLocation(), 2603 diag::err_object_cannot_be_passed_returned_by_value) 2604 << 1 << ArgType; 2605 Param->setInvalidDecl(); 2606 } 2607 Param->setDeclContext(ObjCMethod); 2608 2609 Params.push_back(Param); 2610 } 2611 2612 ObjCMethod->setMethodParams(Context, Params.data(), Params.size()); 2613 ObjCMethod->setObjCDeclQualifier( 2614 CvtQTToAstBitMask(ReturnQT.getObjCDeclQualifier())); 2615 2616 if (AttrList) 2617 ProcessDeclAttributeList(TUScope, ObjCMethod, AttrList); 2618 2619 // Add the method now. 2620 const ObjCMethodDecl *PrevMethod = 0; 2621 if (ObjCImplDecl *ImpDecl = dyn_cast<ObjCImplDecl>(ClassDecl)) { 2622 if (MethodType == tok::minus) { 2623 PrevMethod = ImpDecl->getInstanceMethod(Sel); 2624 ImpDecl->addInstanceMethod(ObjCMethod); 2625 } else { 2626 PrevMethod = ImpDecl->getClassMethod(Sel); 2627 ImpDecl->addClassMethod(ObjCMethod); 2628 } 2629 2630 if (ObjCMethod->hasAttrs() && 2631 containsInvalidMethodImplAttribute(ObjCMethod->getAttrs())) 2632 Diag(EndLoc, diag::warn_attribute_method_def); 2633 } else { 2634 cast<DeclContext>(ClassDecl)->addDecl(ObjCMethod); 2635 } 2636 2637 if (PrevMethod) { 2638 // You can never have two method definitions with the same name. 2639 Diag(ObjCMethod->getLocation(), diag::err_duplicate_method_decl) 2640 << ObjCMethod->getDeclName(); 2641 Diag(PrevMethod->getLocation(), diag::note_previous_declaration); 2642 } 2643 2644 // If this Objective-C method does not have a related result type, but we 2645 // are allowed to infer related result types, try to do so based on the 2646 // method family. 2647 ObjCInterfaceDecl *CurrentClass = dyn_cast<ObjCInterfaceDecl>(ClassDecl); 2648 if (!CurrentClass) { 2649 if (ObjCCategoryDecl *Cat = dyn_cast<ObjCCategoryDecl>(ClassDecl)) 2650 CurrentClass = Cat->getClassInterface(); 2651 else if (ObjCImplDecl *Impl = dyn_cast<ObjCImplDecl>(ClassDecl)) 2652 CurrentClass = Impl->getClassInterface(); 2653 else if (ObjCCategoryImplDecl *CatImpl 2654 = dyn_cast<ObjCCategoryImplDecl>(ClassDecl)) 2655 CurrentClass = CatImpl->getClassInterface(); 2656 } 2657 2658 ResultTypeCompatibilityKind RTC 2659 = CheckRelatedResultTypeCompatibility(*this, ObjCMethod, CurrentClass); 2660 2661 // Search for overridden methods and merge information down from them. 2662 OverrideSearch overrides(*this, ObjCMethod); 2663 for (OverrideSearch::iterator 2664 i = overrides.begin(), e = overrides.end(); i != e; ++i) { 2665 ObjCMethodDecl *overridden = *i; 2666 2667 // Propagate down the 'related result type' bit from overridden methods. 2668 if (RTC != RTC_Incompatible && overridden->hasRelatedResultType()) 2669 ObjCMethod->SetRelatedResultType(); 2670 2671 // Then merge the declarations. 2672 mergeObjCMethodDecls(ObjCMethod, overridden); 2673 2674 // Check for overriding methods 2675 if (isa<ObjCInterfaceDecl>(ObjCMethod->getDeclContext()) || 2676 isa<ObjCImplementationDecl>(ObjCMethod->getDeclContext())) { 2677 WarnConflictingTypedMethods(ObjCMethod, overridden, 2678 isa<ObjCProtocolDecl>(overridden->getDeclContext()), true); 2679 } 2680 } 2681 2682 bool ARCError = false; 2683 if (getLangOptions().ObjCAutoRefCount) 2684 ARCError = CheckARCMethodDecl(*this, ObjCMethod); 2685 2686 // Infer the related result type when possible. 2687 if (!ARCError && RTC == RTC_Compatible && 2688 !ObjCMethod->hasRelatedResultType() && 2689 LangOpts.ObjCInferRelatedResultType) { 2690 bool InferRelatedResultType = false; 2691 switch (ObjCMethod->getMethodFamily()) { 2692 case OMF_None: 2693 case OMF_copy: 2694 case OMF_dealloc: 2695 case OMF_finalize: 2696 case OMF_mutableCopy: 2697 case OMF_release: 2698 case OMF_retainCount: 2699 case OMF_performSelector: 2700 break; 2701 2702 case OMF_alloc: 2703 case OMF_new: 2704 InferRelatedResultType = ObjCMethod->isClassMethod(); 2705 break; 2706 2707 case OMF_init: 2708 case OMF_autorelease: 2709 case OMF_retain: 2710 case OMF_self: 2711 InferRelatedResultType = ObjCMethod->isInstanceMethod(); 2712 break; 2713 } 2714 2715 if (InferRelatedResultType) 2716 ObjCMethod->SetRelatedResultType(); 2717 } 2718 2719 return ObjCMethod; 2720} 2721 2722bool Sema::CheckObjCDeclScope(Decl *D) { 2723 if (isa<TranslationUnitDecl>(CurContext->getRedeclContext())) 2724 return false; 2725 // Following is also an error. But it is caused by a missing @end 2726 // and diagnostic is issued elsewhere. 2727 if (isa<ObjCContainerDecl>(CurContext->getRedeclContext())) { 2728 return false; 2729 } 2730 2731 Diag(D->getLocation(), diag::err_objc_decls_may_only_appear_in_global_scope); 2732 D->setInvalidDecl(); 2733 2734 return true; 2735} 2736 2737/// Called whenever @defs(ClassName) is encountered in the source. Inserts the 2738/// instance variables of ClassName into Decls. 2739void Sema::ActOnDefs(Scope *S, Decl *TagD, SourceLocation DeclStart, 2740 IdentifierInfo *ClassName, 2741 SmallVectorImpl<Decl*> &Decls) { 2742 // Check that ClassName is a valid class 2743 ObjCInterfaceDecl *Class = getObjCInterfaceDecl(ClassName, DeclStart); 2744 if (!Class) { 2745 Diag(DeclStart, diag::err_undef_interface) << ClassName; 2746 return; 2747 } 2748 if (LangOpts.ObjCNonFragileABI) { 2749 Diag(DeclStart, diag::err_atdef_nonfragile_interface); 2750 return; 2751 } 2752 2753 // Collect the instance variables 2754 SmallVector<const ObjCIvarDecl*, 32> Ivars; 2755 Context.DeepCollectObjCIvars(Class, true, Ivars); 2756 // For each ivar, create a fresh ObjCAtDefsFieldDecl. 2757 for (unsigned i = 0; i < Ivars.size(); i++) { 2758 const FieldDecl* ID = cast<FieldDecl>(Ivars[i]); 2759 RecordDecl *Record = dyn_cast<RecordDecl>(TagD); 2760 Decl *FD = ObjCAtDefsFieldDecl::Create(Context, Record, 2761 /*FIXME: StartL=*/ID->getLocation(), 2762 ID->getLocation(), 2763 ID->getIdentifier(), ID->getType(), 2764 ID->getBitWidth()); 2765 Decls.push_back(FD); 2766 } 2767 2768 // Introduce all of these fields into the appropriate scope. 2769 for (SmallVectorImpl<Decl*>::iterator D = Decls.begin(); 2770 D != Decls.end(); ++D) { 2771 FieldDecl *FD = cast<FieldDecl>(*D); 2772 if (getLangOptions().CPlusPlus) 2773 PushOnScopeChains(cast<FieldDecl>(FD), S); 2774 else if (RecordDecl *Record = dyn_cast<RecordDecl>(TagD)) 2775 Record->addDecl(FD); 2776 } 2777} 2778 2779/// \brief Build a type-check a new Objective-C exception variable declaration. 2780VarDecl *Sema::BuildObjCExceptionDecl(TypeSourceInfo *TInfo, QualType T, 2781 SourceLocation StartLoc, 2782 SourceLocation IdLoc, 2783 IdentifierInfo *Id, 2784 bool Invalid) { 2785 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 2786 // duration shall not be qualified by an address-space qualifier." 2787 // Since all parameters have automatic store duration, they can not have 2788 // an address space. 2789 if (T.getAddressSpace() != 0) { 2790 Diag(IdLoc, diag::err_arg_with_address_space); 2791 Invalid = true; 2792 } 2793 2794 // An @catch parameter must be an unqualified object pointer type; 2795 // FIXME: Recover from "NSObject foo" by inserting the * in "NSObject *foo"? 2796 if (Invalid) { 2797 // Don't do any further checking. 2798 } else if (T->isDependentType()) { 2799 // Okay: we don't know what this type will instantiate to. 2800 } else if (!T->isObjCObjectPointerType()) { 2801 Invalid = true; 2802 Diag(IdLoc ,diag::err_catch_param_not_objc_type); 2803 } else if (T->isObjCQualifiedIdType()) { 2804 Invalid = true; 2805 Diag(IdLoc, diag::err_illegal_qualifiers_on_catch_parm); 2806 } 2807 2808 VarDecl *New = VarDecl::Create(Context, CurContext, StartLoc, IdLoc, Id, 2809 T, TInfo, SC_None, SC_None); 2810 New->setExceptionVariable(true); 2811 2812 if (Invalid) 2813 New->setInvalidDecl(); 2814 return New; 2815} 2816 2817Decl *Sema::ActOnObjCExceptionDecl(Scope *S, Declarator &D) { 2818 const DeclSpec &DS = D.getDeclSpec(); 2819 2820 // We allow the "register" storage class on exception variables because 2821 // GCC did, but we drop it completely. Any other storage class is an error. 2822 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 2823 Diag(DS.getStorageClassSpecLoc(), diag::warn_register_objc_catch_parm) 2824 << FixItHint::CreateRemoval(SourceRange(DS.getStorageClassSpecLoc())); 2825 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 2826 Diag(DS.getStorageClassSpecLoc(), diag::err_storage_spec_on_catch_parm) 2827 << DS.getStorageClassSpec(); 2828 } 2829 if (D.getDeclSpec().isThreadSpecified()) 2830 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2831 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2832 2833 DiagnoseFunctionSpecifiers(D); 2834 2835 // Check that there are no default arguments inside the type of this 2836 // exception object (C++ only). 2837 if (getLangOptions().CPlusPlus) 2838 CheckExtraCXXDefaultArguments(D); 2839 2840 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 2841 QualType ExceptionType = TInfo->getType(); 2842 2843 VarDecl *New = BuildObjCExceptionDecl(TInfo, ExceptionType, 2844 D.getSourceRange().getBegin(), 2845 D.getIdentifierLoc(), 2846 D.getIdentifier(), 2847 D.isInvalidType()); 2848 2849 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 2850 if (D.getCXXScopeSpec().isSet()) { 2851 Diag(D.getIdentifierLoc(), diag::err_qualified_objc_catch_parm) 2852 << D.getCXXScopeSpec().getRange(); 2853 New->setInvalidDecl(); 2854 } 2855 2856 // Add the parameter declaration into this scope. 2857 S->AddDecl(New); 2858 if (D.getIdentifier()) 2859 IdResolver.AddDecl(New); 2860 2861 ProcessDeclAttributes(S, New, D); 2862 2863 if (New->hasAttr<BlocksAttr>()) 2864 Diag(New->getLocation(), diag::err_block_on_nonlocal); 2865 return New; 2866} 2867 2868/// CollectIvarsToConstructOrDestruct - Collect those ivars which require 2869/// initialization. 2870void Sema::CollectIvarsToConstructOrDestruct(ObjCInterfaceDecl *OI, 2871 SmallVectorImpl<ObjCIvarDecl*> &Ivars) { 2872 for (ObjCIvarDecl *Iv = OI->all_declared_ivar_begin(); Iv; 2873 Iv= Iv->getNextIvar()) { 2874 QualType QT = Context.getBaseElementType(Iv->getType()); 2875 if (QT->isRecordType()) 2876 Ivars.push_back(Iv); 2877 } 2878} 2879 2880void Sema::DiagnoseUseOfUnimplementedSelectors() { 2881 // Load referenced selectors from the external source. 2882 if (ExternalSource) { 2883 SmallVector<std::pair<Selector, SourceLocation>, 4> Sels; 2884 ExternalSource->ReadReferencedSelectors(Sels); 2885 for (unsigned I = 0, N = Sels.size(); I != N; ++I) 2886 ReferencedSelectors[Sels[I].first] = Sels[I].second; 2887 } 2888 2889 // Warning will be issued only when selector table is 2890 // generated (which means there is at lease one implementation 2891 // in the TU). This is to match gcc's behavior. 2892 if (ReferencedSelectors.empty() || 2893 !Context.AnyObjCImplementation()) 2894 return; 2895 for (llvm::DenseMap<Selector, SourceLocation>::iterator S = 2896 ReferencedSelectors.begin(), 2897 E = ReferencedSelectors.end(); S != E; ++S) { 2898 Selector Sel = (*S).first; 2899 if (!LookupImplementedMethodInGlobalPool(Sel)) 2900 Diag((*S).second, diag::warn_unimplemented_selector) << Sel; 2901 } 2902 return; 2903} 2904