SemaDecl.cpp revision 207632
1115013Smarcel//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2160157Smarcel// 3121642Smarcel// The LLVM Compiler Infrastructure 4121642Smarcel// 5121642Smarcel// This file is distributed under the University of Illinois Open Source 6121642Smarcel// License. See LICENSE.TXT for details. 7121642Smarcel// 8121642Smarcel//===----------------------------------------------------------------------===// 9121642Smarcel// 10121642Smarcel// This file implements semantic analysis for declarations. 11115013Smarcel// 12121642Smarcel//===----------------------------------------------------------------------===// 13121642Smarcel 14121642Smarcel#include "Sema.h" 15121642Smarcel#include "SemaInit.h" 16121642Smarcel#include "Lookup.h" 17121642Smarcel#include "clang/AST/APValue.h" 18121642Smarcel#include "clang/AST/ASTConsumer.h" 19121642Smarcel#include "clang/AST/ASTContext.h" 20121642Smarcel#include "clang/AST/CXXInheritance.h" 21121642Smarcel#include "clang/AST/DeclTemplate.h" 22121642Smarcel#include "clang/AST/ExprCXX.h" 23121642Smarcel#include "clang/AST/StmtCXX.h" 24121642Smarcel#include "clang/Parse/DeclSpec.h" 25115013Smarcel#include "clang/Parse/ParseDiagnostic.h" 26115013Smarcel#include "clang/Parse/Template.h" 27115013Smarcel#include "clang/Basic/PartialDiagnostic.h" 28115013Smarcel#include "clang/Basic/SourceManager.h" 29115013Smarcel#include "clang/Basic/TargetInfo.h" 30115013Smarcel// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 31115013Smarcel#include "clang/Lex/Preprocessor.h" 32115013Smarcel#include "clang/Lex/HeaderSearch.h" 33115013Smarcel#include "llvm/ADT/Triple.h" 34115013Smarcel#include <algorithm> 35115013Smarcel#include <cstring> 36115013Smarcel#include <functional> 37115013Smarcelusing namespace clang; 38115013Smarcel 39115013Smarcel/// getDeclName - Return a pretty name for the specified decl if possible, or 40115013Smarcel/// an empty string if not. This is used for pretty crash reporting. 41115013Smarcelstd::string Sema::getDeclName(DeclPtrTy d) { 42115013Smarcel Decl *D = d.getAs<Decl>(); 43115013Smarcel if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 44115013Smarcel return DN->getQualifiedNameAsString(); 45129059Smarcel return ""; 46115013Smarcel} 47115013Smarcel 48115013SmarcelSema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) { 49115013Smarcel return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>())); 50115013Smarcel} 51115013Smarcel 52115013Smarcel/// \brief If the identifier refers to a type name within this scope, 53129059Smarcel/// return the declaration of that type. 54115013Smarcel/// 55115013Smarcel/// This routine performs ordinary name lookup of the identifier II 56115013Smarcel/// within the given scope, with optional C++ scope specifier SS, to 57115013Smarcel/// determine whether the name refers to a type. If so, returns an 58115013Smarcel/// opaque pointer (actually a QualType) corresponding to that 59115013Smarcel/// type. Otherwise, returns NULL. 60115013Smarcel/// 61115013Smarcel/// If name lookup results in an ambiguity, this routine will complain 62115013Smarcel/// and then return NULL. 63115013SmarcelSema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 64129059Smarcel Scope *S, CXXScopeSpec *SS, 65115013Smarcel bool isClassName, 66115013Smarcel TypeTy *ObjectTypePtr) { 67115013Smarcel // Determine where we will perform name lookup. 68129059Smarcel DeclContext *LookupCtx = 0; 69115013Smarcel if (ObjectTypePtr) { 70129059Smarcel QualType ObjectType = QualType::getFromOpaquePtr(ObjectTypePtr); 71129059Smarcel if (ObjectType->isRecordType()) 72115013Smarcel LookupCtx = computeDeclContext(ObjectType); 73115013Smarcel } else if (SS && SS->isNotEmpty()) { 74115013Smarcel LookupCtx = computeDeclContext(*SS, false); 75115013Smarcel 76115013Smarcel if (!LookupCtx) { 77115013Smarcel if (isDependentScopeSpecifier(*SS)) { 78115013Smarcel // C++ [temp.res]p3: 79160163Smarcel // A qualified-id that refers to a type and in which the 80115013Smarcel // nested-name-specifier depends on a template-parameter (14.6.2) 81160163Smarcel // shall be prefixed by the keyword typename to indicate that the 82160163Smarcel // qualified-id denotes a type, forming an 83115013Smarcel // elaborated-type-specifier (7.1.5.3). 84115013Smarcel // 85115013Smarcel // We therefore do not perform any name lookup if the result would 86115013Smarcel // refer to a member of an unknown specialization. 87160157Smarcel if (!isClassName) 88115013Smarcel return 0; 89115013Smarcel 90115013Smarcel // We know from the grammar that this name refers to a type, so build a 91115013Smarcel // DependentNameType node to describe the type. 92115013Smarcel return CheckTypenameType(ETK_None, 93115013Smarcel (NestedNameSpecifier *)SS->getScopeRep(), 94115013Smarcel II, SS->getRange()).getAsOpaquePtr(); 95115013Smarcel } 96115013Smarcel 97115013Smarcel return 0; 98115013Smarcel } 99115013Smarcel 100160157Smarcel if (!LookupCtx->isDependentContext() && 101160157Smarcel RequireCompleteDeclContext(*SS, LookupCtx)) 102160157Smarcel return 0; 103115013Smarcel } 104115013Smarcel 105115013Smarcel // FIXME: LookupNestedNameSpecifierName isn't the right kind of 106115013Smarcel // lookup for class-names. 107115013Smarcel LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 108115013Smarcel LookupOrdinaryName; 109115013Smarcel LookupResult Result(*this, &II, NameLoc, Kind); 110115013Smarcel if (LookupCtx) { 111115013Smarcel // Perform "qualified" name lookup into the declaration context we 112115013Smarcel // computed, which is either the type of the base of a member access 113115013Smarcel // expression or the declaration context associated with a prior 114115013Smarcel // nested-name-specifier. 115115013Smarcel LookupQualifiedName(Result, LookupCtx); 116115013Smarcel 117115013Smarcel if (ObjectTypePtr && Result.empty()) { 118115013Smarcel // C++ [basic.lookup.classref]p3: 119129059Smarcel // If the unqualified-id is ~type-name, the type-name is looked up 120115013Smarcel // in the context of the entire postfix-expression. If the type T of 121115013Smarcel // the object expression is of a class type C, the type-name is also 122115013Smarcel // looked up in the scope of class C. At least one of the lookups shall 123115013Smarcel // find a name that refers to (possibly cv-qualified) T. 124115013Smarcel LookupName(Result, S); 125115013Smarcel } 126129059Smarcel } else { 127115013Smarcel // Perform unqualified name lookup. 128115013Smarcel LookupName(Result, S); 129115013Smarcel } 130115013Smarcel 131115013Smarcel NamedDecl *IIDecl = 0; 132115013Smarcel switch (Result.getResultKind()) { 133115013Smarcel case LookupResult::NotFound: 134115013Smarcel case LookupResult::NotFoundInCurrentInstantiation: 135115013Smarcel case LookupResult::FoundOverloaded: 136115013Smarcel case LookupResult::FoundUnresolvedValue: 137115013Smarcel Result.suppressDiagnostics(); 138115013Smarcel return 0; 139115013Smarcel 140160157Smarcel case LookupResult::Ambiguous: 141160157Smarcel // Recover from type-hiding ambiguities by hiding the type. We'll 142115013Smarcel // do the lookup again when looking for an object, and we can 143115013Smarcel // diagnose the error then. If we don't do this, then the error 144129059Smarcel // about hiding the type will be immediately followed by an error 145115013Smarcel // that only makes sense if the identifier was treated like a type. 146115013Smarcel if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 147115013Smarcel Result.suppressDiagnostics(); 148115013Smarcel return 0; 149115013Smarcel } 150115013Smarcel 151115013Smarcel // Look to see if we have a type anywhere in the list of results. 152129059Smarcel for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 153115013Smarcel Res != ResEnd; ++Res) { 154115013Smarcel if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 155115013Smarcel if (!IIDecl || 156115013Smarcel (*Res)->getLocation().getRawEncoding() < 157115013Smarcel IIDecl->getLocation().getRawEncoding()) 158115013Smarcel IIDecl = *Res; 159115013Smarcel } 160115013Smarcel } 161129059Smarcel 162115013Smarcel if (!IIDecl) { 163115013Smarcel // None of the entities we found is a type, so there is no way 164115013Smarcel // to even assume that the result is a type. In this case, don't 165115013Smarcel // complain about the ambiguity. The parser will either try to 166115013Smarcel // perform this lookup again (e.g., as an object name), which 167115013Smarcel // will produce the ambiguity, or will complain that it expected 168115013Smarcel // a type name. 169115013Smarcel Result.suppressDiagnostics(); 170160163Smarcel return 0; 171115013Smarcel } 172115013Smarcel 173160163Smarcel // We found a type within the ambiguous lookup; diagnose the 174160163Smarcel // ambiguity and then return that type. This might be the right 175115013Smarcel // answer, or it might not be, but it suppresses any attempt to 176160163Smarcel // perform the name lookup again. 177115013Smarcel break; 178115013Smarcel 179115013Smarcel case LookupResult::Found: 180115013Smarcel IIDecl = Result.getFoundDecl(); 181115013Smarcel break; 182115013Smarcel } 183115013Smarcel 184115013Smarcel assert(IIDecl && "Didn't find decl"); 185115013Smarcel 186115013Smarcel QualType T; 187115013Smarcel if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 188115013Smarcel DiagnoseUseOfDecl(IIDecl, NameLoc); 189115013Smarcel 190115013Smarcel if (T.isNull()) 191115013Smarcel T = Context.getTypeDeclType(TD); 192115013Smarcel 193115013Smarcel if (SS) 194160163Smarcel T = getQualifiedNameType(*SS, T); 195115013Smarcel 196115013Smarcel } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 197115013Smarcel T = Context.getObjCInterfaceType(IDecl); 198115013Smarcel } else if (UnresolvedUsingTypenameDecl *UUDecl = 199160157Smarcel dyn_cast<UnresolvedUsingTypenameDecl>(IIDecl)) { 200160157Smarcel // FIXME: preserve source structure information. 201160157Smarcel T = Context.getDependentNameType(ETK_None, 202160157Smarcel UUDecl->getTargetNestedNameSpecifier(), 203115013Smarcel &II); 204115013Smarcel } else { 205115013Smarcel // If it's not plausibly a type, suppress diagnostics. 206115013Smarcel Result.suppressDiagnostics(); 207115013Smarcel return 0; 208115013Smarcel } 209115013Smarcel 210115013Smarcel return T.getAsOpaquePtr(); 211160157Smarcel} 212115013Smarcel 213160157Smarcel/// isTagName() - This method is called *for error recovery purposes only* 214115013Smarcel/// to determine if the specified name is a valid tag name ("struct foo"). If 215115013Smarcel/// so, this returns the TST for the tag corresponding to it (TST_enum, 216115013Smarcel/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 217129059Smarcel/// where the user forgot to specify the tag. 218115013SmarcelDeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 219115013Smarcel // Do a tag name lookup in this scope. 220115013Smarcel LookupResult R(*this, &II, SourceLocation(), LookupTagName); 221115013Smarcel LookupName(R, S, false); 222115013Smarcel R.suppressDiagnostics(); 223115013Smarcel if (R.getResultKind() == LookupResult::Found) 224115013Smarcel if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 225129059Smarcel switch (TD->getTagKind()) { 226115013Smarcel case TagDecl::TK_struct: return DeclSpec::TST_struct; 227115013Smarcel case TagDecl::TK_union: return DeclSpec::TST_union; 228115013Smarcel case TagDecl::TK_class: return DeclSpec::TST_class; 229115013Smarcel case TagDecl::TK_enum: return DeclSpec::TST_enum; 230115013Smarcel } 231115013Smarcel } 232115013Smarcel 233115013Smarcel return DeclSpec::TST_unspecified; 234129059Smarcel} 235115013Smarcel 236115013Smarcelbool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 237115013Smarcel SourceLocation IILoc, 238115013Smarcel Scope *S, 239115013Smarcel CXXScopeSpec *SS, 240115013Smarcel TypeTy *&SuggestedType) { 241160163Smarcel // We don't have anything to suggest (yet). 242115013Smarcel SuggestedType = 0; 243115013Smarcel 244115013Smarcel // There may have been a typo in the name of the type. Look up typo 245115013Smarcel // results, in case we have something that we can suggest. 246115013Smarcel LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 247115013Smarcel NotForRedeclaration); 248115013Smarcel 249115013Smarcel if (DeclarationName Corrected = CorrectTypo(Lookup, S, SS, 0, 0, CTC_Type)) { 250115013Smarcel if (NamedDecl *Result = Lookup.getAsSingle<NamedDecl>()) { 251115013Smarcel if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 252115013Smarcel !Result->isInvalidDecl()) { 253115013Smarcel // We found a similarly-named type or interface; suggest that. 254115013Smarcel if (!SS || !SS->isSet()) 255115013Smarcel Diag(IILoc, diag::err_unknown_typename_suggest) 256115013Smarcel << &II << Lookup.getLookupName() 257115013Smarcel << FixItHint::CreateReplacement(SourceRange(IILoc), 258115013Smarcel Result->getNameAsString()); 259115013Smarcel else if (DeclContext *DC = computeDeclContext(*SS, false)) 260115013Smarcel Diag(IILoc, diag::err_unknown_nested_typename_suggest) 261115013Smarcel << &II << DC << Lookup.getLookupName() << SS->getRange() 262115013Smarcel << FixItHint::CreateReplacement(SourceRange(IILoc), 263115013Smarcel Result->getNameAsString()); 264115013Smarcel else 265115013Smarcel llvm_unreachable("could not have corrected a typo here"); 266115013Smarcel 267115013Smarcel Diag(Result->getLocation(), diag::note_previous_decl) 268160157Smarcel << Result->getDeclName(); 269115013Smarcel 270115013Smarcel SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS); 271115013Smarcel return true; 272115013Smarcel } 273115013Smarcel } else if (Lookup.empty()) { 274 // We corrected to a keyword. 275 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 276 Diag(IILoc, diag::err_unknown_typename_suggest) 277 << &II << Corrected; 278 return true; 279 } 280 } 281 282 if (getLangOptions().CPlusPlus) { 283 // See if II is a class template that the user forgot to pass arguments to. 284 UnqualifiedId Name; 285 Name.setIdentifier(&II, IILoc); 286 CXXScopeSpec EmptySS; 287 TemplateTy TemplateResult; 288 if (isTemplateName(S, SS ? *SS : EmptySS, Name, 0, true, TemplateResult) 289 == TNK_Type_template) { 290 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 291 Diag(IILoc, diag::err_template_missing_args) << TplName; 292 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 293 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 294 << TplDecl->getTemplateParameters()->getSourceRange(); 295 } 296 return true; 297 } 298 } 299 300 // FIXME: Should we move the logic that tries to recover from a missing tag 301 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 302 303 if (!SS || (!SS->isSet() && !SS->isInvalid())) 304 Diag(IILoc, diag::err_unknown_typename) << &II; 305 else if (DeclContext *DC = computeDeclContext(*SS, false)) 306 Diag(IILoc, diag::err_typename_nested_not_found) 307 << &II << DC << SS->getRange(); 308 else if (isDependentScopeSpecifier(*SS)) { 309 Diag(SS->getRange().getBegin(), diag::err_typename_missing) 310 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 311 << SourceRange(SS->getRange().getBegin(), IILoc) 312 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 313 SuggestedType = ActOnTypenameType(SourceLocation(), *SS, II, IILoc).get(); 314 } else { 315 assert(SS && SS->isInvalid() && 316 "Invalid scope specifier has already been diagnosed"); 317 } 318 319 return true; 320} 321 322// Determines the context to return to after temporarily entering a 323// context. This depends in an unnecessarily complicated way on the 324// exact ordering of callbacks from the parser. 325DeclContext *Sema::getContainingDC(DeclContext *DC) { 326 327 // Functions defined inline within classes aren't parsed until we've 328 // finished parsing the top-level class, so the top-level class is 329 // the context we'll need to return to. 330 if (isa<FunctionDecl>(DC)) { 331 DC = DC->getLexicalParent(); 332 333 // A function not defined within a class will always return to its 334 // lexical context. 335 if (!isa<CXXRecordDecl>(DC)) 336 return DC; 337 338 // A C++ inline method/friend is parsed *after* the topmost class 339 // it was declared in is fully parsed ("complete"); the topmost 340 // class is the context we need to return to. 341 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 342 DC = RD; 343 344 // Return the declaration context of the topmost class the inline method is 345 // declared in. 346 return DC; 347 } 348 349 if (isa<ObjCMethodDecl>(DC)) 350 return Context.getTranslationUnitDecl(); 351 352 return DC->getLexicalParent(); 353} 354 355void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 356 assert(getContainingDC(DC) == CurContext && 357 "The next DeclContext should be lexically contained in the current one."); 358 CurContext = DC; 359 S->setEntity(DC); 360} 361 362void Sema::PopDeclContext() { 363 assert(CurContext && "DeclContext imbalance!"); 364 365 CurContext = getContainingDC(CurContext); 366} 367 368/// EnterDeclaratorContext - Used when we must lookup names in the context 369/// of a declarator's nested name specifier. 370/// 371void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 372 // C++0x [basic.lookup.unqual]p13: 373 // A name used in the definition of a static data member of class 374 // X (after the qualified-id of the static member) is looked up as 375 // if the name was used in a member function of X. 376 // C++0x [basic.lookup.unqual]p14: 377 // If a variable member of a namespace is defined outside of the 378 // scope of its namespace then any name used in the definition of 379 // the variable member (after the declarator-id) is looked up as 380 // if the definition of the variable member occurred in its 381 // namespace. 382 // Both of these imply that we should push a scope whose context 383 // is the semantic context of the declaration. We can't use 384 // PushDeclContext here because that context is not necessarily 385 // lexically contained in the current context. Fortunately, 386 // the containing scope should have the appropriate information. 387 388 assert(!S->getEntity() && "scope already has entity"); 389 390#ifndef NDEBUG 391 Scope *Ancestor = S->getParent(); 392 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 393 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 394#endif 395 396 CurContext = DC; 397 S->setEntity(DC); 398} 399 400void Sema::ExitDeclaratorContext(Scope *S) { 401 assert(S->getEntity() == CurContext && "Context imbalance!"); 402 403 // Switch back to the lexical context. The safety of this is 404 // enforced by an assert in EnterDeclaratorContext. 405 Scope *Ancestor = S->getParent(); 406 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 407 CurContext = (DeclContext*) Ancestor->getEntity(); 408 409 // We don't need to do anything with the scope, which is going to 410 // disappear. 411} 412 413/// \brief Determine whether we allow overloading of the function 414/// PrevDecl with another declaration. 415/// 416/// This routine determines whether overloading is possible, not 417/// whether some new function is actually an overload. It will return 418/// true in C++ (where we can always provide overloads) or, as an 419/// extension, in C when the previous function is already an 420/// overloaded function declaration or has the "overloadable" 421/// attribute. 422static bool AllowOverloadingOfFunction(LookupResult &Previous, 423 ASTContext &Context) { 424 if (Context.getLangOptions().CPlusPlus) 425 return true; 426 427 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 428 return true; 429 430 return (Previous.getResultKind() == LookupResult::Found 431 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 432} 433 434/// Add this decl to the scope shadowed decl chains. 435void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 436 // Move up the scope chain until we find the nearest enclosing 437 // non-transparent context. The declaration will be introduced into this 438 // scope. 439 while (S->getEntity() && 440 ((DeclContext *)S->getEntity())->isTransparentContext()) 441 S = S->getParent(); 442 443 // Add scoped declarations into their context, so that they can be 444 // found later. Declarations without a context won't be inserted 445 // into any context. 446 if (AddToContext) 447 CurContext->addDecl(D); 448 449 // Out-of-line definitions shouldn't be pushed into scope in C++. 450 // Out-of-line variable and function definitions shouldn't even in C. 451 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 452 D->isOutOfLine()) 453 return; 454 455 // Template instantiations should also not be pushed into scope. 456 if (isa<FunctionDecl>(D) && 457 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 458 return; 459 460 // If this replaces anything in the current scope, 461 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 462 IEnd = IdResolver.end(); 463 for (; I != IEnd; ++I) { 464 if (S->isDeclScope(DeclPtrTy::make(*I)) && D->declarationReplaces(*I)) { 465 S->RemoveDecl(DeclPtrTy::make(*I)); 466 IdResolver.RemoveDecl(*I); 467 468 // Should only need to replace one decl. 469 break; 470 } 471 } 472 473 S->AddDecl(DeclPtrTy::make(D)); 474 IdResolver.AddDecl(D); 475} 476 477bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) { 478 return IdResolver.isDeclInScope(D, Ctx, Context, S); 479} 480 481static bool isOutOfScopePreviousDeclaration(NamedDecl *, 482 DeclContext*, 483 ASTContext&); 484 485/// Filters out lookup results that don't fall within the given scope 486/// as determined by isDeclInScope. 487static void FilterLookupForScope(Sema &SemaRef, LookupResult &R, 488 DeclContext *Ctx, Scope *S, 489 bool ConsiderLinkage) { 490 LookupResult::Filter F = R.makeFilter(); 491 while (F.hasNext()) { 492 NamedDecl *D = F.next(); 493 494 if (SemaRef.isDeclInScope(D, Ctx, S)) 495 continue; 496 497 if (ConsiderLinkage && 498 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context)) 499 continue; 500 501 F.erase(); 502 } 503 504 F.done(); 505} 506 507static bool isUsingDecl(NamedDecl *D) { 508 return isa<UsingShadowDecl>(D) || 509 isa<UnresolvedUsingTypenameDecl>(D) || 510 isa<UnresolvedUsingValueDecl>(D); 511} 512 513/// Removes using shadow declarations from the lookup results. 514static void RemoveUsingDecls(LookupResult &R) { 515 LookupResult::Filter F = R.makeFilter(); 516 while (F.hasNext()) 517 if (isUsingDecl(F.next())) 518 F.erase(); 519 520 F.done(); 521} 522 523static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 524 if (D->isInvalidDecl()) 525 return false; 526 527 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 528 return false; 529 530 // White-list anything that isn't a local variable. 531 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 532 !D->getDeclContext()->isFunctionOrMethod()) 533 return false; 534 535 // Types of valid local variables should be complete, so this should succeed. 536 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 537 538 // White-list anything with an __attribute__((unused)) type. 539 QualType Ty = VD->getType(); 540 541 // Only look at the outermost level of typedef. 542 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 543 if (TT->getDecl()->hasAttr<UnusedAttr>()) 544 return false; 545 } 546 547 // If we failed to complete the type for some reason, don't 548 // diagnose the variable. 549 if (Ty->isIncompleteType()) 550 return false; 551 552 if (const TagType *TT = Ty->getAs<TagType>()) { 553 const TagDecl *Tag = TT->getDecl(); 554 if (Tag->hasAttr<UnusedAttr>()) 555 return false; 556 557 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 558 if (!RD->hasTrivialConstructor()) 559 return false; 560 if (!RD->hasTrivialDestructor()) 561 return false; 562 } 563 } 564 565 // TODO: __attribute__((unused)) templates? 566 } 567 568 return true; 569} 570 571void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 572 if (S->decl_empty()) return; 573 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 574 "Scope shouldn't contain decls!"); 575 576 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 577 I != E; ++I) { 578 Decl *TmpD = (*I).getAs<Decl>(); 579 assert(TmpD && "This decl didn't get pushed??"); 580 581 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 582 NamedDecl *D = cast<NamedDecl>(TmpD); 583 584 if (!D->getDeclName()) continue; 585 586 // Diagnose unused variables in this scope. 587 if (ShouldDiagnoseUnusedDecl(D) && 588 S->getNumErrorsAtStart() == getDiagnostics().getNumErrors()) { 589 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 590 Diag(D->getLocation(), diag::warn_unused_exception_param) 591 << D->getDeclName(); 592 else 593 Diag(D->getLocation(), diag::warn_unused_variable) 594 << D->getDeclName(); 595 } 596 // Remove this name from our lexical scope. 597 IdResolver.RemoveDecl(D); 598 } 599} 600 601/// \brief Look for an Objective-C class in the translation unit. 602/// 603/// \param Id The name of the Objective-C class we're looking for. If 604/// typo-correction fixes this name, the Id will be updated 605/// to the fixed name. 606/// 607/// \param IdLoc The location of the name in the translation unit. 608/// 609/// \param TypoCorrection If true, this routine will attempt typo correction 610/// if there is no class with the given name. 611/// 612/// \returns The declaration of the named Objective-C class, or NULL if the 613/// class could not be found. 614ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 615 SourceLocation IdLoc, 616 bool TypoCorrection) { 617 // The third "scope" argument is 0 since we aren't enabling lazy built-in 618 // creation from this context. 619 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 620 621 if (!IDecl && TypoCorrection) { 622 // Perform typo correction at the given location, but only if we 623 // find an Objective-C class name. 624 LookupResult R(*this, Id, IdLoc, LookupOrdinaryName); 625 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 626 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 627 Diag(IdLoc, diag::err_undef_interface_suggest) 628 << Id << IDecl->getDeclName() 629 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 630 Diag(IDecl->getLocation(), diag::note_previous_decl) 631 << IDecl->getDeclName(); 632 633 Id = IDecl->getIdentifier(); 634 } 635 } 636 637 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 638} 639 640/// getNonFieldDeclScope - Retrieves the innermost scope, starting 641/// from S, where a non-field would be declared. This routine copes 642/// with the difference between C and C++ scoping rules in structs and 643/// unions. For example, the following code is well-formed in C but 644/// ill-formed in C++: 645/// @code 646/// struct S6 { 647/// enum { BAR } e; 648/// }; 649/// 650/// void test_S6() { 651/// struct S6 a; 652/// a.e = BAR; 653/// } 654/// @endcode 655/// For the declaration of BAR, this routine will return a different 656/// scope. The scope S will be the scope of the unnamed enumeration 657/// within S6. In C++, this routine will return the scope associated 658/// with S6, because the enumeration's scope is a transparent 659/// context but structures can contain non-field names. In C, this 660/// routine will return the translation unit scope, since the 661/// enumeration's scope is a transparent context and structures cannot 662/// contain non-field names. 663Scope *Sema::getNonFieldDeclScope(Scope *S) { 664 while (((S->getFlags() & Scope::DeclScope) == 0) || 665 (S->getEntity() && 666 ((DeclContext *)S->getEntity())->isTransparentContext()) || 667 (S->isClassScope() && !getLangOptions().CPlusPlus)) 668 S = S->getParent(); 669 return S; 670} 671 672void Sema::InitBuiltinVaListType() { 673 if (!Context.getBuiltinVaListType().isNull()) 674 return; 675 676 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 677 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, SourceLocation(), 678 LookupOrdinaryName, ForRedeclaration); 679 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 680 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 681} 682 683/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 684/// file scope. lazily create a decl for it. ForRedeclaration is true 685/// if we're creating this built-in in anticipation of redeclaring the 686/// built-in. 687NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 688 Scope *S, bool ForRedeclaration, 689 SourceLocation Loc) { 690 Builtin::ID BID = (Builtin::ID)bid; 691 692 if (Context.BuiltinInfo.hasVAListUse(BID)) 693 InitBuiltinVaListType(); 694 695 ASTContext::GetBuiltinTypeError Error; 696 QualType R = Context.GetBuiltinType(BID, Error); 697 switch (Error) { 698 case ASTContext::GE_None: 699 // Okay 700 break; 701 702 case ASTContext::GE_Missing_stdio: 703 if (ForRedeclaration) 704 Diag(Loc, diag::err_implicit_decl_requires_stdio) 705 << Context.BuiltinInfo.GetName(BID); 706 return 0; 707 708 case ASTContext::GE_Missing_setjmp: 709 if (ForRedeclaration) 710 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 711 << Context.BuiltinInfo.GetName(BID); 712 return 0; 713 } 714 715 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 716 Diag(Loc, diag::ext_implicit_lib_function_decl) 717 << Context.BuiltinInfo.GetName(BID) 718 << R; 719 if (Context.BuiltinInfo.getHeaderName(BID) && 720 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 721 != Diagnostic::Ignored) 722 Diag(Loc, diag::note_please_include_header) 723 << Context.BuiltinInfo.getHeaderName(BID) 724 << Context.BuiltinInfo.GetName(BID); 725 } 726 727 FunctionDecl *New = FunctionDecl::Create(Context, 728 Context.getTranslationUnitDecl(), 729 Loc, II, R, /*TInfo=*/0, 730 FunctionDecl::Extern, 731 FunctionDecl::None, false, 732 /*hasPrototype=*/true); 733 New->setImplicit(); 734 735 // Create Decl objects for each parameter, adding them to the 736 // FunctionDecl. 737 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 738 llvm::SmallVector<ParmVarDecl*, 16> Params; 739 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 740 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 741 FT->getArgType(i), /*TInfo=*/0, 742 VarDecl::None, VarDecl::None, 0)); 743 New->setParams(Params.data(), Params.size()); 744 } 745 746 AddKnownFunctionAttributes(New); 747 748 // TUScope is the translation-unit scope to insert this function into. 749 // FIXME: This is hideous. We need to teach PushOnScopeChains to 750 // relate Scopes to DeclContexts, and probably eliminate CurContext 751 // entirely, but we're not there yet. 752 DeclContext *SavedContext = CurContext; 753 CurContext = Context.getTranslationUnitDecl(); 754 PushOnScopeChains(New, TUScope); 755 CurContext = SavedContext; 756 return New; 757} 758 759/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 760/// same name and scope as a previous declaration 'Old'. Figure out 761/// how to resolve this situation, merging decls or emitting 762/// diagnostics as appropriate. If there was an error, set New to be invalid. 763/// 764void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 765 // If the new decl is known invalid already, don't bother doing any 766 // merging checks. 767 if (New->isInvalidDecl()) return; 768 769 // Allow multiple definitions for ObjC built-in typedefs. 770 // FIXME: Verify the underlying types are equivalent! 771 if (getLangOptions().ObjC1) { 772 const IdentifierInfo *TypeID = New->getIdentifier(); 773 switch (TypeID->getLength()) { 774 default: break; 775 case 2: 776 if (!TypeID->isStr("id")) 777 break; 778 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 779 // Install the built-in type for 'id', ignoring the current definition. 780 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 781 return; 782 case 5: 783 if (!TypeID->isStr("Class")) 784 break; 785 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 786 // Install the built-in type for 'Class', ignoring the current definition. 787 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 788 return; 789 case 3: 790 if (!TypeID->isStr("SEL")) 791 break; 792 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 793 // Install the built-in type for 'SEL', ignoring the current definition. 794 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 795 return; 796 case 8: 797 if (!TypeID->isStr("Protocol")) 798 break; 799 Context.setObjCProtoType(New->getUnderlyingType()); 800 return; 801 } 802 // Fall through - the typedef name was not a builtin type. 803 } 804 805 // Verify the old decl was also a type. 806 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 807 if (!Old) { 808 Diag(New->getLocation(), diag::err_redefinition_different_kind) 809 << New->getDeclName(); 810 811 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 812 if (OldD->getLocation().isValid()) 813 Diag(OldD->getLocation(), diag::note_previous_definition); 814 815 return New->setInvalidDecl(); 816 } 817 818 // If the old declaration is invalid, just give up here. 819 if (Old->isInvalidDecl()) 820 return New->setInvalidDecl(); 821 822 // Determine the "old" type we'll use for checking and diagnostics. 823 QualType OldType; 824 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 825 OldType = OldTypedef->getUnderlyingType(); 826 else 827 OldType = Context.getTypeDeclType(Old); 828 829 // If the typedef types are not identical, reject them in all languages and 830 // with any extensions enabled. 831 832 if (OldType != New->getUnderlyingType() && 833 Context.getCanonicalType(OldType) != 834 Context.getCanonicalType(New->getUnderlyingType())) { 835 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 836 << New->getUnderlyingType() << OldType; 837 if (Old->getLocation().isValid()) 838 Diag(Old->getLocation(), diag::note_previous_definition); 839 return New->setInvalidDecl(); 840 } 841 842 // The types match. Link up the redeclaration chain if the old 843 // declaration was a typedef. 844 // FIXME: this is a potential source of wierdness if the type 845 // spellings don't match exactly. 846 if (isa<TypedefDecl>(Old)) 847 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 848 849 if (getLangOptions().Microsoft) 850 return; 851 852 if (getLangOptions().CPlusPlus) { 853 // C++ [dcl.typedef]p2: 854 // In a given non-class scope, a typedef specifier can be used to 855 // redefine the name of any type declared in that scope to refer 856 // to the type to which it already refers. 857 if (!isa<CXXRecordDecl>(CurContext)) 858 return; 859 860 // C++0x [dcl.typedef]p4: 861 // In a given class scope, a typedef specifier can be used to redefine 862 // any class-name declared in that scope that is not also a typedef-name 863 // to refer to the type to which it already refers. 864 // 865 // This wording came in via DR424, which was a correction to the 866 // wording in DR56, which accidentally banned code like: 867 // 868 // struct S { 869 // typedef struct A { } A; 870 // }; 871 // 872 // in the C++03 standard. We implement the C++0x semantics, which 873 // allow the above but disallow 874 // 875 // struct S { 876 // typedef int I; 877 // typedef int I; 878 // }; 879 // 880 // since that was the intent of DR56. 881 if (!isa<TypedefDecl >(Old)) 882 return; 883 884 Diag(New->getLocation(), diag::err_redefinition) 885 << New->getDeclName(); 886 Diag(Old->getLocation(), diag::note_previous_definition); 887 return New->setInvalidDecl(); 888 } 889 890 // If we have a redefinition of a typedef in C, emit a warning. This warning 891 // is normally mapped to an error, but can be controlled with 892 // -Wtypedef-redefinition. If either the original or the redefinition is 893 // in a system header, don't emit this for compatibility with GCC. 894 if (getDiagnostics().getSuppressSystemWarnings() && 895 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 896 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 897 return; 898 899 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 900 << New->getDeclName(); 901 Diag(Old->getLocation(), diag::note_previous_definition); 902 return; 903} 904 905/// DeclhasAttr - returns true if decl Declaration already has the target 906/// attribute. 907static bool 908DeclHasAttr(const Decl *decl, const Attr *target) { 909 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 910 if (attr->getKind() == target->getKind()) 911 return true; 912 913 return false; 914} 915 916/// MergeAttributes - append attributes from the Old decl to the New one. 917static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 918 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 919 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 920 Attr *NewAttr = attr->clone(C); 921 NewAttr->setInherited(true); 922 New->addAttr(NewAttr); 923 } 924 } 925} 926 927/// Used in MergeFunctionDecl to keep track of function parameters in 928/// C. 929struct GNUCompatibleParamWarning { 930 ParmVarDecl *OldParm; 931 ParmVarDecl *NewParm; 932 QualType PromotedType; 933}; 934 935 936/// getSpecialMember - get the special member enum for a method. 937Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 938 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 939 if (Ctor->isCopyConstructor()) 940 return Sema::CXXCopyConstructor; 941 942 return Sema::CXXConstructor; 943 } 944 945 if (isa<CXXDestructorDecl>(MD)) 946 return Sema::CXXDestructor; 947 948 assert(MD->isCopyAssignment() && "Must have copy assignment operator"); 949 return Sema::CXXCopyAssignment; 950} 951 952/// canREdefineFunction - checks if a function can be redefined. Currently, 953/// only extern inline functions can be redefined, and even then only in 954/// GNU89 mode. 955static bool canRedefineFunction(const FunctionDecl *FD, 956 const LangOptions& LangOpts) { 957 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 958 FD->isInlineSpecified() && 959 FD->getStorageClass() == FunctionDecl::Extern); 960} 961 962/// MergeFunctionDecl - We just parsed a function 'New' from 963/// declarator D which has the same name and scope as a previous 964/// declaration 'Old'. Figure out how to resolve this situation, 965/// merging decls or emitting diagnostics as appropriate. 966/// 967/// In C++, New and Old must be declarations that are not 968/// overloaded. Use IsOverload to determine whether New and Old are 969/// overloaded, and to select the Old declaration that New should be 970/// merged with. 971/// 972/// Returns true if there was an error, false otherwise. 973bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 974 // Verify the old decl was also a function. 975 FunctionDecl *Old = 0; 976 if (FunctionTemplateDecl *OldFunctionTemplate 977 = dyn_cast<FunctionTemplateDecl>(OldD)) 978 Old = OldFunctionTemplate->getTemplatedDecl(); 979 else 980 Old = dyn_cast<FunctionDecl>(OldD); 981 if (!Old) { 982 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 983 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 984 Diag(Shadow->getTargetDecl()->getLocation(), 985 diag::note_using_decl_target); 986 Diag(Shadow->getUsingDecl()->getLocation(), 987 diag::note_using_decl) << 0; 988 return true; 989 } 990 991 Diag(New->getLocation(), diag::err_redefinition_different_kind) 992 << New->getDeclName(); 993 Diag(OldD->getLocation(), diag::note_previous_definition); 994 return true; 995 } 996 997 // Determine whether the previous declaration was a definition, 998 // implicit declaration, or a declaration. 999 diag::kind PrevDiag; 1000 if (Old->isThisDeclarationADefinition()) 1001 PrevDiag = diag::note_previous_definition; 1002 else if (Old->isImplicit()) 1003 PrevDiag = diag::note_previous_implicit_declaration; 1004 else 1005 PrevDiag = diag::note_previous_declaration; 1006 1007 QualType OldQType = Context.getCanonicalType(Old->getType()); 1008 QualType NewQType = Context.getCanonicalType(New->getType()); 1009 1010 // Don't complain about this if we're in GNU89 mode and the old function 1011 // is an extern inline function. 1012 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1013 New->getStorageClass() == FunctionDecl::Static && 1014 Old->getStorageClass() != FunctionDecl::Static && 1015 !canRedefineFunction(Old, getLangOptions())) { 1016 Diag(New->getLocation(), diag::err_static_non_static) 1017 << New; 1018 Diag(Old->getLocation(), PrevDiag); 1019 return true; 1020 } 1021 1022 // If a function is first declared with a calling convention, but is 1023 // later declared or defined without one, the second decl assumes the 1024 // calling convention of the first. 1025 // 1026 // For the new decl, we have to look at the NON-canonical type to tell the 1027 // difference between a function that really doesn't have a calling 1028 // convention and one that is declared cdecl. That's because in 1029 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1030 // because it is the default calling convention. 1031 // 1032 // Note also that we DO NOT return at this point, because we still have 1033 // other tests to run. 1034 const FunctionType *OldType = OldQType->getAs<FunctionType>(); 1035 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1036 const FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1037 const FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1038 if (OldTypeInfo.getCC() != CC_Default && 1039 NewTypeInfo.getCC() == CC_Default) { 1040 NewQType = Context.getCallConvType(NewQType, OldTypeInfo.getCC()); 1041 New->setType(NewQType); 1042 NewQType = Context.getCanonicalType(NewQType); 1043 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1044 NewTypeInfo.getCC())) { 1045 // Calling conventions really aren't compatible, so complain. 1046 Diag(New->getLocation(), diag::err_cconv_change) 1047 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1048 << (OldTypeInfo.getCC() == CC_Default) 1049 << (OldTypeInfo.getCC() == CC_Default ? "" : 1050 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1051 Diag(Old->getLocation(), diag::note_previous_declaration); 1052 return true; 1053 } 1054 1055 // FIXME: diagnose the other way around? 1056 if (OldType->getNoReturnAttr() && 1057 !NewType->getNoReturnAttr()) { 1058 NewQType = Context.getNoReturnType(NewQType); 1059 New->setType(NewQType); 1060 assert(NewQType.isCanonical()); 1061 } 1062 1063 if (getLangOptions().CPlusPlus) { 1064 // (C++98 13.1p2): 1065 // Certain function declarations cannot be overloaded: 1066 // -- Function declarations that differ only in the return type 1067 // cannot be overloaded. 1068 QualType OldReturnType 1069 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1070 QualType NewReturnType 1071 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1072 if (OldReturnType != NewReturnType) { 1073 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1074 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1075 return true; 1076 } 1077 1078 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1079 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1080 if (OldMethod && NewMethod) { 1081 // Preserve triviality. 1082 NewMethod->setTrivial(OldMethod->isTrivial()); 1083 1084 bool isFriend = NewMethod->getFriendObjectKind(); 1085 1086 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) { 1087 // -- Member function declarations with the same name and the 1088 // same parameter types cannot be overloaded if any of them 1089 // is a static member function declaration. 1090 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1091 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1092 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1093 return true; 1094 } 1095 1096 // C++ [class.mem]p1: 1097 // [...] A member shall not be declared twice in the 1098 // member-specification, except that a nested class or member 1099 // class template can be declared and then later defined. 1100 unsigned NewDiag; 1101 if (isa<CXXConstructorDecl>(OldMethod)) 1102 NewDiag = diag::err_constructor_redeclared; 1103 else if (isa<CXXDestructorDecl>(NewMethod)) 1104 NewDiag = diag::err_destructor_redeclared; 1105 else if (isa<CXXConversionDecl>(NewMethod)) 1106 NewDiag = diag::err_conv_function_redeclared; 1107 else 1108 NewDiag = diag::err_member_redeclared; 1109 1110 Diag(New->getLocation(), NewDiag); 1111 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1112 1113 // Complain if this is an explicit declaration of a special 1114 // member that was initially declared implicitly. 1115 // 1116 // As an exception, it's okay to befriend such methods in order 1117 // to permit the implicit constructor/destructor/operator calls. 1118 } else if (OldMethod->isImplicit()) { 1119 if (isFriend) { 1120 NewMethod->setImplicit(); 1121 } else { 1122 Diag(NewMethod->getLocation(), 1123 diag::err_definition_of_implicitly_declared_member) 1124 << New << getSpecialMember(OldMethod); 1125 return true; 1126 } 1127 } 1128 } 1129 1130 // (C++98 8.3.5p3): 1131 // All declarations for a function shall agree exactly in both the 1132 // return type and the parameter-type-list. 1133 // attributes should be ignored when comparing. 1134 if (Context.getNoReturnType(OldQType, false) == 1135 Context.getNoReturnType(NewQType, false)) 1136 return MergeCompatibleFunctionDecls(New, Old); 1137 1138 // Fall through for conflicting redeclarations and redefinitions. 1139 } 1140 1141 // C: Function types need to be compatible, not identical. This handles 1142 // duplicate function decls like "void f(int); void f(enum X);" properly. 1143 if (!getLangOptions().CPlusPlus && 1144 Context.typesAreCompatible(OldQType, NewQType)) { 1145 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1146 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1147 const FunctionProtoType *OldProto = 0; 1148 if (isa<FunctionNoProtoType>(NewFuncType) && 1149 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1150 // The old declaration provided a function prototype, but the 1151 // new declaration does not. Merge in the prototype. 1152 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1153 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1154 OldProto->arg_type_end()); 1155 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1156 ParamTypes.data(), ParamTypes.size(), 1157 OldProto->isVariadic(), 1158 OldProto->getTypeQuals(), 1159 false, false, 0, 0, 1160 OldProto->getExtInfo()); 1161 New->setType(NewQType); 1162 New->setHasInheritedPrototype(); 1163 1164 // Synthesize a parameter for each argument type. 1165 llvm::SmallVector<ParmVarDecl*, 16> Params; 1166 for (FunctionProtoType::arg_type_iterator 1167 ParamType = OldProto->arg_type_begin(), 1168 ParamEnd = OldProto->arg_type_end(); 1169 ParamType != ParamEnd; ++ParamType) { 1170 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1171 SourceLocation(), 0, 1172 *ParamType, /*TInfo=*/0, 1173 VarDecl::None, VarDecl::None, 1174 0); 1175 Param->setImplicit(); 1176 Params.push_back(Param); 1177 } 1178 1179 New->setParams(Params.data(), Params.size()); 1180 } 1181 1182 return MergeCompatibleFunctionDecls(New, Old); 1183 } 1184 1185 // GNU C permits a K&R definition to follow a prototype declaration 1186 // if the declared types of the parameters in the K&R definition 1187 // match the types in the prototype declaration, even when the 1188 // promoted types of the parameters from the K&R definition differ 1189 // from the types in the prototype. GCC then keeps the types from 1190 // the prototype. 1191 // 1192 // If a variadic prototype is followed by a non-variadic K&R definition, 1193 // the K&R definition becomes variadic. This is sort of an edge case, but 1194 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1195 // C99 6.9.1p8. 1196 if (!getLangOptions().CPlusPlus && 1197 Old->hasPrototype() && !New->hasPrototype() && 1198 New->getType()->getAs<FunctionProtoType>() && 1199 Old->getNumParams() == New->getNumParams()) { 1200 llvm::SmallVector<QualType, 16> ArgTypes; 1201 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1202 const FunctionProtoType *OldProto 1203 = Old->getType()->getAs<FunctionProtoType>(); 1204 const FunctionProtoType *NewProto 1205 = New->getType()->getAs<FunctionProtoType>(); 1206 1207 // Determine whether this is the GNU C extension. 1208 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1209 NewProto->getResultType()); 1210 bool LooseCompatible = !MergedReturn.isNull(); 1211 for (unsigned Idx = 0, End = Old->getNumParams(); 1212 LooseCompatible && Idx != End; ++Idx) { 1213 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1214 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1215 if (Context.typesAreCompatible(OldParm->getType(), 1216 NewProto->getArgType(Idx))) { 1217 ArgTypes.push_back(NewParm->getType()); 1218 } else if (Context.typesAreCompatible(OldParm->getType(), 1219 NewParm->getType())) { 1220 GNUCompatibleParamWarning Warn 1221 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1222 Warnings.push_back(Warn); 1223 ArgTypes.push_back(NewParm->getType()); 1224 } else 1225 LooseCompatible = false; 1226 } 1227 1228 if (LooseCompatible) { 1229 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1230 Diag(Warnings[Warn].NewParm->getLocation(), 1231 diag::ext_param_promoted_not_compatible_with_prototype) 1232 << Warnings[Warn].PromotedType 1233 << Warnings[Warn].OldParm->getType(); 1234 Diag(Warnings[Warn].OldParm->getLocation(), 1235 diag::note_previous_declaration); 1236 } 1237 1238 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1239 ArgTypes.size(), 1240 OldProto->isVariadic(), 0, 1241 false, false, 0, 0, 1242 OldProto->getExtInfo())); 1243 return MergeCompatibleFunctionDecls(New, Old); 1244 } 1245 1246 // Fall through to diagnose conflicting types. 1247 } 1248 1249 // A function that has already been declared has been redeclared or defined 1250 // with a different type- show appropriate diagnostic 1251 if (unsigned BuiltinID = Old->getBuiltinID()) { 1252 // The user has declared a builtin function with an incompatible 1253 // signature. 1254 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1255 // The function the user is redeclaring is a library-defined 1256 // function like 'malloc' or 'printf'. Warn about the 1257 // redeclaration, then pretend that we don't know about this 1258 // library built-in. 1259 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1260 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1261 << Old << Old->getType(); 1262 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1263 Old->setInvalidDecl(); 1264 return false; 1265 } 1266 1267 PrevDiag = diag::note_previous_builtin_declaration; 1268 } 1269 1270 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1271 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1272 return true; 1273} 1274 1275/// \brief Completes the merge of two function declarations that are 1276/// known to be compatible. 1277/// 1278/// This routine handles the merging of attributes and other 1279/// properties of function declarations form the old declaration to 1280/// the new declaration, once we know that New is in fact a 1281/// redeclaration of Old. 1282/// 1283/// \returns false 1284bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1285 // Merge the attributes 1286 MergeAttributes(New, Old, Context); 1287 1288 // Merge the storage class. 1289 if (Old->getStorageClass() != FunctionDecl::Extern && 1290 Old->getStorageClass() != FunctionDecl::None) 1291 New->setStorageClass(Old->getStorageClass()); 1292 1293 // Merge "pure" flag. 1294 if (Old->isPure()) 1295 New->setPure(); 1296 1297 // Merge the "deleted" flag. 1298 if (Old->isDeleted()) 1299 New->setDeleted(); 1300 1301 if (getLangOptions().CPlusPlus) 1302 return MergeCXXFunctionDecl(New, Old); 1303 1304 return false; 1305} 1306 1307/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1308/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1309/// situation, merging decls or emitting diagnostics as appropriate. 1310/// 1311/// Tentative definition rules (C99 6.9.2p2) are checked by 1312/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1313/// definitions here, since the initializer hasn't been attached. 1314/// 1315void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1316 // If the new decl is already invalid, don't do any other checking. 1317 if (New->isInvalidDecl()) 1318 return; 1319 1320 // Verify the old decl was also a variable. 1321 VarDecl *Old = 0; 1322 if (!Previous.isSingleResult() || 1323 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1324 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1325 << New->getDeclName(); 1326 Diag(Previous.getRepresentativeDecl()->getLocation(), 1327 diag::note_previous_definition); 1328 return New->setInvalidDecl(); 1329 } 1330 1331 MergeAttributes(New, Old, Context); 1332 1333 // Merge the types 1334 QualType MergedT; 1335 if (getLangOptions().CPlusPlus) { 1336 if (Context.hasSameType(New->getType(), Old->getType())) 1337 MergedT = New->getType(); 1338 // C++ [basic.link]p10: 1339 // [...] the types specified by all declarations referring to a given 1340 // object or function shall be identical, except that declarations for an 1341 // array object can specify array types that differ by the presence or 1342 // absence of a major array bound (8.3.4). 1343 else if (Old->getType()->isIncompleteArrayType() && 1344 New->getType()->isArrayType()) { 1345 CanQual<ArrayType> OldArray 1346 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1347 CanQual<ArrayType> NewArray 1348 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1349 if (OldArray->getElementType() == NewArray->getElementType()) 1350 MergedT = New->getType(); 1351 } else if (Old->getType()->isArrayType() && 1352 New->getType()->isIncompleteArrayType()) { 1353 CanQual<ArrayType> OldArray 1354 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1355 CanQual<ArrayType> NewArray 1356 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1357 if (OldArray->getElementType() == NewArray->getElementType()) 1358 MergedT = Old->getType(); 1359 } 1360 } else { 1361 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1362 } 1363 if (MergedT.isNull()) { 1364 Diag(New->getLocation(), diag::err_redefinition_different_type) 1365 << New->getDeclName(); 1366 Diag(Old->getLocation(), diag::note_previous_definition); 1367 return New->setInvalidDecl(); 1368 } 1369 New->setType(MergedT); 1370 1371 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1372 if (New->getStorageClass() == VarDecl::Static && 1373 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 1374 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1375 Diag(Old->getLocation(), diag::note_previous_definition); 1376 return New->setInvalidDecl(); 1377 } 1378 // C99 6.2.2p4: 1379 // For an identifier declared with the storage-class specifier 1380 // extern in a scope in which a prior declaration of that 1381 // identifier is visible,23) if the prior declaration specifies 1382 // internal or external linkage, the linkage of the identifier at 1383 // the later declaration is the same as the linkage specified at 1384 // the prior declaration. If no prior declaration is visible, or 1385 // if the prior declaration specifies no linkage, then the 1386 // identifier has external linkage. 1387 if (New->hasExternalStorage() && Old->hasLinkage()) 1388 /* Okay */; 1389 else if (New->getStorageClass() != VarDecl::Static && 1390 Old->getStorageClass() == VarDecl::Static) { 1391 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1392 Diag(Old->getLocation(), diag::note_previous_definition); 1393 return New->setInvalidDecl(); 1394 } 1395 1396 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1397 1398 // FIXME: The test for external storage here seems wrong? We still 1399 // need to check for mismatches. 1400 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1401 // Don't complain about out-of-line definitions of static members. 1402 !(Old->getLexicalDeclContext()->isRecord() && 1403 !New->getLexicalDeclContext()->isRecord())) { 1404 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1405 Diag(Old->getLocation(), diag::note_previous_definition); 1406 return New->setInvalidDecl(); 1407 } 1408 1409 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1410 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1411 Diag(Old->getLocation(), diag::note_previous_definition); 1412 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1413 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1414 Diag(Old->getLocation(), diag::note_previous_definition); 1415 } 1416 1417 // C++ doesn't have tentative definitions, so go right ahead and check here. 1418 const VarDecl *Def; 1419 if (getLangOptions().CPlusPlus && 1420 New->isThisDeclarationADefinition() == VarDecl::Definition && 1421 (Def = Old->getDefinition())) { 1422 Diag(New->getLocation(), diag::err_redefinition) 1423 << New->getDeclName(); 1424 Diag(Def->getLocation(), diag::note_previous_definition); 1425 New->setInvalidDecl(); 1426 return; 1427 } 1428 1429 // Keep a chain of previous declarations. 1430 New->setPreviousDeclaration(Old); 1431 1432 // Inherit access appropriately. 1433 New->setAccess(Old->getAccess()); 1434} 1435 1436/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1437/// no declarator (e.g. "struct foo;") is parsed. 1438Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 1439 // FIXME: Error on auto/register at file scope 1440 // FIXME: Error on inline/virtual/explicit 1441 // FIXME: Warn on useless __thread 1442 // FIXME: Warn on useless const/volatile 1443 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1444 // FIXME: Warn on useless attributes 1445 Decl *TagD = 0; 1446 TagDecl *Tag = 0; 1447 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1448 DS.getTypeSpecType() == DeclSpec::TST_struct || 1449 DS.getTypeSpecType() == DeclSpec::TST_union || 1450 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1451 TagD = static_cast<Decl *>(DS.getTypeRep()); 1452 1453 if (!TagD) // We probably had an error 1454 return DeclPtrTy(); 1455 1456 // Note that the above type specs guarantee that the 1457 // type rep is a Decl, whereas in many of the others 1458 // it's a Type. 1459 Tag = dyn_cast<TagDecl>(TagD); 1460 } 1461 1462 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1463 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1464 // or incomplete types shall not be restrict-qualified." 1465 if (TypeQuals & DeclSpec::TQ_restrict) 1466 Diag(DS.getRestrictSpecLoc(), 1467 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1468 << DS.getSourceRange(); 1469 } 1470 1471 if (DS.isFriendSpecified()) { 1472 // If we're dealing with a class template decl, assume that the 1473 // template routines are handling it. 1474 if (TagD && isa<ClassTemplateDecl>(TagD)) 1475 return DeclPtrTy(); 1476 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1477 } 1478 1479 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1480 // If there are attributes in the DeclSpec, apply them to the record. 1481 if (const AttributeList *AL = DS.getAttributes()) 1482 ProcessDeclAttributeList(S, Record, AL); 1483 1484 if (!Record->getDeclName() && Record->isDefinition() && 1485 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1486 if (getLangOptions().CPlusPlus || 1487 Record->getDeclContext()->isRecord()) 1488 return BuildAnonymousStructOrUnion(S, DS, Record); 1489 1490 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1491 << DS.getSourceRange(); 1492 } 1493 1494 // Microsoft allows unnamed struct/union fields. Don't complain 1495 // about them. 1496 // FIXME: Should we support Microsoft's extensions in this area? 1497 if (Record->getDeclName() && getLangOptions().Microsoft) 1498 return DeclPtrTy::make(Tag); 1499 } 1500 1501 if (!DS.isMissingDeclaratorOk() && 1502 DS.getTypeSpecType() != DeclSpec::TST_error) { 1503 // Warn about typedefs of enums without names, since this is an 1504 // extension in both Microsoft an GNU. 1505 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1506 Tag && isa<EnumDecl>(Tag)) { 1507 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1508 << DS.getSourceRange(); 1509 return DeclPtrTy::make(Tag); 1510 } 1511 1512 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1513 << DS.getSourceRange(); 1514 } 1515 1516 return DeclPtrTy::make(Tag); 1517} 1518 1519/// We are trying to inject an anonymous member into the given scope; 1520/// check if there's an existing declaration that can't be overloaded. 1521/// 1522/// \return true if this is a forbidden redeclaration 1523static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1524 Scope *S, 1525 DeclContext *Owner, 1526 DeclarationName Name, 1527 SourceLocation NameLoc, 1528 unsigned diagnostic) { 1529 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1530 Sema::ForRedeclaration); 1531 if (!SemaRef.LookupName(R, S)) return false; 1532 1533 if (R.getAsSingle<TagDecl>()) 1534 return false; 1535 1536 // Pick a representative declaration. 1537 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1538 if (PrevDecl && Owner->isRecord()) { 1539 RecordDecl *Record = cast<RecordDecl>(Owner); 1540 if (!SemaRef.isDeclInScope(PrevDecl, Record, S)) 1541 return false; 1542 } 1543 1544 SemaRef.Diag(NameLoc, diagnostic) << Name; 1545 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1546 1547 return true; 1548} 1549 1550/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1551/// anonymous struct or union AnonRecord into the owning context Owner 1552/// and scope S. This routine will be invoked just after we realize 1553/// that an unnamed union or struct is actually an anonymous union or 1554/// struct, e.g., 1555/// 1556/// @code 1557/// union { 1558/// int i; 1559/// float f; 1560/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1561/// // f into the surrounding scope.x 1562/// @endcode 1563/// 1564/// This routine is recursive, injecting the names of nested anonymous 1565/// structs/unions into the owning context and scope as well. 1566bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1567 RecordDecl *AnonRecord) { 1568 unsigned diagKind 1569 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1570 : diag::err_anonymous_struct_member_redecl; 1571 1572 bool Invalid = false; 1573 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1574 FEnd = AnonRecord->field_end(); 1575 F != FEnd; ++F) { 1576 if ((*F)->getDeclName()) { 1577 if (CheckAnonMemberRedeclaration(*this, S, Owner, (*F)->getDeclName(), 1578 (*F)->getLocation(), diagKind)) { 1579 // C++ [class.union]p2: 1580 // The names of the members of an anonymous union shall be 1581 // distinct from the names of any other entity in the 1582 // scope in which the anonymous union is declared. 1583 Invalid = true; 1584 } else { 1585 // C++ [class.union]p2: 1586 // For the purpose of name lookup, after the anonymous union 1587 // definition, the members of the anonymous union are 1588 // considered to have been defined in the scope in which the 1589 // anonymous union is declared. 1590 Owner->makeDeclVisibleInContext(*F); 1591 S->AddDecl(DeclPtrTy::make(*F)); 1592 IdResolver.AddDecl(*F); 1593 } 1594 } else if (const RecordType *InnerRecordType 1595 = (*F)->getType()->getAs<RecordType>()) { 1596 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1597 if (InnerRecord->isAnonymousStructOrUnion()) 1598 Invalid = Invalid || 1599 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1600 } 1601 } 1602 1603 return Invalid; 1604} 1605 1606/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 1607/// a VarDecl::StorageClass. Any error reporting is up to the caller: 1608/// illegal input values are mapped to VarDecl::None. 1609/// If the input declaration context is a linkage specification 1610/// with no braces, then Extern is mapped to None. 1611static VarDecl::StorageClass 1612StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec, 1613 DeclContext *DC) { 1614 switch (StorageClassSpec) { 1615 case DeclSpec::SCS_unspecified: return VarDecl::None; 1616 case DeclSpec::SCS_extern: 1617 // If the current context is a C++ linkage specification 1618 // having no braces, then the keyword "extern" is properly part 1619 // of the linkage specification itself, rather than being 1620 // the written storage class specifier. 1621 return (DC && isa<LinkageSpecDecl>(DC) && 1622 !cast<LinkageSpecDecl>(DC)->hasBraces()) 1623 ? VarDecl::None : VarDecl::Extern; 1624 case DeclSpec::SCS_static: return VarDecl::Static; 1625 case DeclSpec::SCS_auto: return VarDecl::Auto; 1626 case DeclSpec::SCS_register: return VarDecl::Register; 1627 case DeclSpec::SCS_private_extern: return VarDecl::PrivateExtern; 1628 // Illegal SCSs map to None: error reporting is up to the caller. 1629 case DeclSpec::SCS_mutable: // Fall through. 1630 case DeclSpec::SCS_typedef: return VarDecl::None; 1631 } 1632 llvm_unreachable("unknown storage class specifier"); 1633} 1634 1635/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 1636/// a FunctionDecl::StorageClass. Any error reporting is up to the caller: 1637/// illegal input values are mapped to FunctionDecl::None. 1638/// If the input declaration context is a linkage specification 1639/// with no braces, then Extern is mapped to None. 1640static FunctionDecl::StorageClass 1641StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec, 1642 DeclContext *DC) { 1643 switch (StorageClassSpec) { 1644 case DeclSpec::SCS_unspecified: return FunctionDecl::None; 1645 case DeclSpec::SCS_extern: 1646 // If the current context is a C++ linkage specification 1647 // having no braces, then the keyword "extern" is properly part 1648 // of the linkage specification itself, rather than being 1649 // the written storage class specifier. 1650 return (DC && isa<LinkageSpecDecl>(DC) && 1651 !cast<LinkageSpecDecl>(DC)->hasBraces()) 1652 ? FunctionDecl::None : FunctionDecl::Extern; 1653 case DeclSpec::SCS_static: return FunctionDecl::Static; 1654 case DeclSpec::SCS_private_extern: return FunctionDecl::PrivateExtern; 1655 // Illegal SCSs map to None: error reporting is up to the caller. 1656 case DeclSpec::SCS_auto: // Fall through. 1657 case DeclSpec::SCS_mutable: // Fall through. 1658 case DeclSpec::SCS_register: // Fall through. 1659 case DeclSpec::SCS_typedef: return FunctionDecl::None; 1660 } 1661 llvm_unreachable("unknown storage class specifier"); 1662} 1663 1664/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1665/// anonymous structure or union. Anonymous unions are a C++ feature 1666/// (C++ [class.union]) and a GNU C extension; anonymous structures 1667/// are a GNU C and GNU C++ extension. 1668Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1669 RecordDecl *Record) { 1670 DeclContext *Owner = Record->getDeclContext(); 1671 1672 // Diagnose whether this anonymous struct/union is an extension. 1673 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1674 Diag(Record->getLocation(), diag::ext_anonymous_union); 1675 else if (!Record->isUnion()) 1676 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1677 1678 // C and C++ require different kinds of checks for anonymous 1679 // structs/unions. 1680 bool Invalid = false; 1681 if (getLangOptions().CPlusPlus) { 1682 const char* PrevSpec = 0; 1683 unsigned DiagID; 1684 // C++ [class.union]p3: 1685 // Anonymous unions declared in a named namespace or in the 1686 // global namespace shall be declared static. 1687 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1688 (isa<TranslationUnitDecl>(Owner) || 1689 (isa<NamespaceDecl>(Owner) && 1690 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1691 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1692 Invalid = true; 1693 1694 // Recover by adding 'static'. 1695 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1696 PrevSpec, DiagID); 1697 } 1698 // C++ [class.union]p3: 1699 // A storage class is not allowed in a declaration of an 1700 // anonymous union in a class scope. 1701 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1702 isa<RecordDecl>(Owner)) { 1703 Diag(DS.getStorageClassSpecLoc(), 1704 diag::err_anonymous_union_with_storage_spec); 1705 Invalid = true; 1706 1707 // Recover by removing the storage specifier. 1708 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1709 PrevSpec, DiagID); 1710 } 1711 1712 // C++ [class.union]p2: 1713 // The member-specification of an anonymous union shall only 1714 // define non-static data members. [Note: nested types and 1715 // functions cannot be declared within an anonymous union. ] 1716 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1717 MemEnd = Record->decls_end(); 1718 Mem != MemEnd; ++Mem) { 1719 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1720 // C++ [class.union]p3: 1721 // An anonymous union shall not have private or protected 1722 // members (clause 11). 1723 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1724 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1725 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1726 Invalid = true; 1727 } 1728 } else if ((*Mem)->isImplicit()) { 1729 // Any implicit members are fine. 1730 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1731 // This is a type that showed up in an 1732 // elaborated-type-specifier inside the anonymous struct or 1733 // union, but which actually declares a type outside of the 1734 // anonymous struct or union. It's okay. 1735 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1736 if (!MemRecord->isAnonymousStructOrUnion() && 1737 MemRecord->getDeclName()) { 1738 // This is a nested type declaration. 1739 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1740 << (int)Record->isUnion(); 1741 Invalid = true; 1742 } 1743 } else { 1744 // We have something that isn't a non-static data 1745 // member. Complain about it. 1746 unsigned DK = diag::err_anonymous_record_bad_member; 1747 if (isa<TypeDecl>(*Mem)) 1748 DK = diag::err_anonymous_record_with_type; 1749 else if (isa<FunctionDecl>(*Mem)) 1750 DK = diag::err_anonymous_record_with_function; 1751 else if (isa<VarDecl>(*Mem)) 1752 DK = diag::err_anonymous_record_with_static; 1753 Diag((*Mem)->getLocation(), DK) 1754 << (int)Record->isUnion(); 1755 Invalid = true; 1756 } 1757 } 1758 } 1759 1760 if (!Record->isUnion() && !Owner->isRecord()) { 1761 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1762 << (int)getLangOptions().CPlusPlus; 1763 Invalid = true; 1764 } 1765 1766 // Mock up a declarator. 1767 Declarator Dc(DS, Declarator::TypeNameContext); 1768 TypeSourceInfo *TInfo = 0; 1769 GetTypeForDeclarator(Dc, S, &TInfo); 1770 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1771 1772 // Create a declaration for this anonymous struct/union. 1773 NamedDecl *Anon = 0; 1774 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1775 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1776 /*IdentifierInfo=*/0, 1777 Context.getTypeDeclType(Record), 1778 TInfo, 1779 /*BitWidth=*/0, /*Mutable=*/false); 1780 Anon->setAccess(AS_public); 1781 if (getLangOptions().CPlusPlus) { 1782 FieldCollector->Add(cast<FieldDecl>(Anon)); 1783 if (!cast<CXXRecordDecl>(Record)->isEmpty()) 1784 cast<CXXRecordDecl>(OwningClass)->setEmpty(false); 1785 } 1786 } else { 1787 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 1788 assert(SCSpec != DeclSpec::SCS_typedef && 1789 "Parser allowed 'typedef' as storage class VarDecl."); 1790 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec, 0); 1791 if (SCSpec == DeclSpec::SCS_mutable) { 1792 // mutable can only appear on non-static class members, so it's always 1793 // an error here 1794 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1795 Invalid = true; 1796 SC = VarDecl::None; 1797 } 1798 SCSpec = DS.getStorageClassSpecAsWritten(); 1799 VarDecl::StorageClass SCAsWritten 1800 = StorageClassSpecToVarDeclStorageClass(SCSpec, 0); 1801 1802 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1803 /*IdentifierInfo=*/0, 1804 Context.getTypeDeclType(Record), 1805 TInfo, SC, SCAsWritten); 1806 } 1807 Anon->setImplicit(); 1808 1809 // Add the anonymous struct/union object to the current 1810 // context. We'll be referencing this object when we refer to one of 1811 // its members. 1812 Owner->addDecl(Anon); 1813 1814 // Inject the members of the anonymous struct/union into the owning 1815 // context and into the identifier resolver chain for name lookup 1816 // purposes. 1817 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1818 Invalid = true; 1819 1820 // Mark this as an anonymous struct/union type. Note that we do not 1821 // do this until after we have already checked and injected the 1822 // members of this anonymous struct/union type, because otherwise 1823 // the members could be injected twice: once by DeclContext when it 1824 // builds its lookup table, and once by 1825 // InjectAnonymousStructOrUnionMembers. 1826 Record->setAnonymousStructOrUnion(true); 1827 1828 if (Invalid) 1829 Anon->setInvalidDecl(); 1830 1831 return DeclPtrTy::make(Anon); 1832} 1833 1834 1835/// GetNameForDeclarator - Determine the full declaration name for the 1836/// given Declarator. 1837DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1838 return GetNameFromUnqualifiedId(D.getName()); 1839} 1840 1841/// \brief Retrieves the canonicalized name from a parsed unqualified-id. 1842DeclarationName Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 1843 switch (Name.getKind()) { 1844 case UnqualifiedId::IK_Identifier: 1845 return DeclarationName(Name.Identifier); 1846 1847 case UnqualifiedId::IK_OperatorFunctionId: 1848 return Context.DeclarationNames.getCXXOperatorName( 1849 Name.OperatorFunctionId.Operator); 1850 1851 case UnqualifiedId::IK_LiteralOperatorId: 1852 return Context.DeclarationNames.getCXXLiteralOperatorName( 1853 Name.Identifier); 1854 1855 case UnqualifiedId::IK_ConversionFunctionId: { 1856 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId); 1857 if (Ty.isNull()) 1858 return DeclarationName(); 1859 1860 return Context.DeclarationNames.getCXXConversionFunctionName( 1861 Context.getCanonicalType(Ty)); 1862 } 1863 1864 case UnqualifiedId::IK_ConstructorName: { 1865 QualType Ty = GetTypeFromParser(Name.ConstructorName); 1866 if (Ty.isNull()) 1867 return DeclarationName(); 1868 1869 return Context.DeclarationNames.getCXXConstructorName( 1870 Context.getCanonicalType(Ty)); 1871 } 1872 1873 case UnqualifiedId::IK_ConstructorTemplateId: { 1874 // In well-formed code, we can only have a constructor 1875 // template-id that refers to the current context, so go there 1876 // to find the actual type being constructed. 1877 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 1878 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 1879 return DeclarationName(); 1880 1881 // Determine the type of the class being constructed. 1882 QualType CurClassType = Context.getTypeDeclType(CurClass); 1883 1884 // FIXME: Check two things: that the template-id names the same type as 1885 // CurClassType, and that the template-id does not occur when the name 1886 // was qualified. 1887 1888 return Context.DeclarationNames.getCXXConstructorName( 1889 Context.getCanonicalType(CurClassType)); 1890 } 1891 1892 case UnqualifiedId::IK_DestructorName: { 1893 QualType Ty = GetTypeFromParser(Name.DestructorName); 1894 if (Ty.isNull()) 1895 return DeclarationName(); 1896 1897 return Context.DeclarationNames.getCXXDestructorName( 1898 Context.getCanonicalType(Ty)); 1899 } 1900 1901 case UnqualifiedId::IK_TemplateId: { 1902 TemplateName TName 1903 = TemplateName::getFromVoidPointer(Name.TemplateId->Template); 1904 return Context.getNameForTemplate(TName); 1905 } 1906 } 1907 1908 assert(false && "Unknown name kind"); 1909 return DeclarationName(); 1910} 1911 1912/// isNearlyMatchingFunction - Determine whether the C++ functions 1913/// Declaration and Definition are "nearly" matching. This heuristic 1914/// is used to improve diagnostics in the case where an out-of-line 1915/// function definition doesn't match any declaration within 1916/// the class or namespace. 1917static bool isNearlyMatchingFunction(ASTContext &Context, 1918 FunctionDecl *Declaration, 1919 FunctionDecl *Definition) { 1920 if (Declaration->param_size() != Definition->param_size()) 1921 return false; 1922 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1923 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1924 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1925 1926 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 1927 DefParamTy.getNonReferenceType())) 1928 return false; 1929 } 1930 1931 return true; 1932} 1933 1934/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 1935/// declarator needs to be rebuilt in the current instantiation. 1936/// Any bits of declarator which appear before the name are valid for 1937/// consideration here. That's specifically the type in the decl spec 1938/// and the base type in any member-pointer chunks. 1939static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 1940 DeclarationName Name) { 1941 // The types we specifically need to rebuild are: 1942 // - typenames, typeofs, and decltypes 1943 // - types which will become injected class names 1944 // Of course, we also need to rebuild any type referencing such a 1945 // type. It's safest to just say "dependent", but we call out a 1946 // few cases here. 1947 1948 DeclSpec &DS = D.getMutableDeclSpec(); 1949 switch (DS.getTypeSpecType()) { 1950 case DeclSpec::TST_typename: 1951 case DeclSpec::TST_typeofType: 1952 case DeclSpec::TST_typeofExpr: 1953 case DeclSpec::TST_decltype: { 1954 // Grab the type from the parser. 1955 TypeSourceInfo *TSI = 0; 1956 QualType T = S.GetTypeFromParser(DS.getTypeRep(), &TSI); 1957 if (T.isNull() || !T->isDependentType()) break; 1958 1959 // Make sure there's a type source info. This isn't really much 1960 // of a waste; most dependent types should have type source info 1961 // attached already. 1962 if (!TSI) 1963 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 1964 1965 // Rebuild the type in the current instantiation. 1966 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 1967 if (!TSI) return true; 1968 1969 // Store the new type back in the decl spec. 1970 QualType LocType = S.CreateLocInfoType(TSI->getType(), TSI); 1971 DS.UpdateTypeRep(LocType.getAsOpaquePtr()); 1972 break; 1973 } 1974 1975 default: 1976 // Nothing to do for these decl specs. 1977 break; 1978 } 1979 1980 // It doesn't matter what order we do this in. 1981 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 1982 DeclaratorChunk &Chunk = D.getTypeObject(I); 1983 1984 // The only type information in the declarator which can come 1985 // before the declaration name is the base type of a member 1986 // pointer. 1987 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 1988 continue; 1989 1990 // Rebuild the scope specifier in-place. 1991 CXXScopeSpec &SS = Chunk.Mem.Scope(); 1992 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 1993 return true; 1994 } 1995 1996 return false; 1997} 1998 1999Sema::DeclPtrTy 2000Sema::HandleDeclarator(Scope *S, Declarator &D, 2001 MultiTemplateParamsArg TemplateParamLists, 2002 bool IsFunctionDefinition) { 2003 DeclarationName Name = GetNameForDeclarator(D); 2004 2005 // All of these full declarators require an identifier. If it doesn't have 2006 // one, the ParsedFreeStandingDeclSpec action should be used. 2007 if (!Name) { 2008 if (!D.isInvalidType()) // Reject this if we think it is valid. 2009 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2010 diag::err_declarator_need_ident) 2011 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2012 return DeclPtrTy(); 2013 } 2014 2015 // The scope passed in may not be a decl scope. Zip up the scope tree until 2016 // we find one that is. 2017 while ((S->getFlags() & Scope::DeclScope) == 0 || 2018 (S->getFlags() & Scope::TemplateParamScope) != 0) 2019 S = S->getParent(); 2020 2021 DeclContext *DC = CurContext; 2022 if (D.getCXXScopeSpec().isInvalid()) 2023 D.setInvalidType(); 2024 else if (D.getCXXScopeSpec().isSet()) { 2025 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2026 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2027 if (!DC) { 2028 // If we could not compute the declaration context, it's because the 2029 // declaration context is dependent but does not refer to a class, 2030 // class template, or class template partial specialization. Complain 2031 // and return early, to avoid the coming semantic disaster. 2032 Diag(D.getIdentifierLoc(), 2033 diag::err_template_qualified_declarator_no_match) 2034 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2035 << D.getCXXScopeSpec().getRange(); 2036 return DeclPtrTy(); 2037 } 2038 2039 bool IsDependentContext = DC->isDependentContext(); 2040 2041 if (!IsDependentContext && 2042 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2043 return DeclPtrTy(); 2044 2045 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 2046 Diag(D.getIdentifierLoc(), 2047 diag::err_member_def_undefined_record) 2048 << Name << DC << D.getCXXScopeSpec().getRange(); 2049 D.setInvalidType(); 2050 } 2051 2052 // Check whether we need to rebuild the type of the given 2053 // declaration in the current instantiation. 2054 if (EnteringContext && IsDependentContext && 2055 TemplateParamLists.size() != 0) { 2056 ContextRAII SavedContext(*this, DC); 2057 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 2058 D.setInvalidType(); 2059 } 2060 } 2061 2062 NamedDecl *New; 2063 2064 TypeSourceInfo *TInfo = 0; 2065 QualType R = GetTypeForDeclarator(D, S, &TInfo); 2066 2067 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 2068 ForRedeclaration); 2069 2070 // See if this is a redefinition of a variable in the same scope. 2071 if (!D.getCXXScopeSpec().isSet()) { 2072 bool IsLinkageLookup = false; 2073 2074 // If the declaration we're planning to build will be a function 2075 // or object with linkage, then look for another declaration with 2076 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 2077 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2078 /* Do nothing*/; 2079 else if (R->isFunctionType()) { 2080 if (CurContext->isFunctionOrMethod() || 2081 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2082 IsLinkageLookup = true; 2083 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 2084 IsLinkageLookup = true; 2085 else if (CurContext->getLookupContext()->isTranslationUnit() && 2086 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2087 IsLinkageLookup = true; 2088 2089 if (IsLinkageLookup) 2090 Previous.clear(LookupRedeclarationWithLinkage); 2091 2092 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 2093 } else { // Something like "int foo::x;" 2094 LookupQualifiedName(Previous, DC); 2095 2096 // Don't consider using declarations as previous declarations for 2097 // out-of-line members. 2098 RemoveUsingDecls(Previous); 2099 2100 // C++ 7.3.1.2p2: 2101 // Members (including explicit specializations of templates) of a named 2102 // namespace can also be defined outside that namespace by explicit 2103 // qualification of the name being defined, provided that the entity being 2104 // defined was already declared in the namespace and the definition appears 2105 // after the point of declaration in a namespace that encloses the 2106 // declarations namespace. 2107 // 2108 // Note that we only check the context at this point. We don't yet 2109 // have enough information to make sure that PrevDecl is actually 2110 // the declaration we want to match. For example, given: 2111 // 2112 // class X { 2113 // void f(); 2114 // void f(float); 2115 // }; 2116 // 2117 // void X::f(int) { } // ill-formed 2118 // 2119 // In this case, PrevDecl will point to the overload set 2120 // containing the two f's declared in X, but neither of them 2121 // matches. 2122 2123 // First check whether we named the global scope. 2124 if (isa<TranslationUnitDecl>(DC)) { 2125 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 2126 << Name << D.getCXXScopeSpec().getRange(); 2127 } else { 2128 DeclContext *Cur = CurContext; 2129 while (isa<LinkageSpecDecl>(Cur)) 2130 Cur = Cur->getParent(); 2131 if (!Cur->Encloses(DC)) { 2132 // The qualifying scope doesn't enclose the original declaration. 2133 // Emit diagnostic based on current scope. 2134 SourceLocation L = D.getIdentifierLoc(); 2135 SourceRange R = D.getCXXScopeSpec().getRange(); 2136 if (isa<FunctionDecl>(Cur)) 2137 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 2138 else 2139 Diag(L, diag::err_invalid_declarator_scope) 2140 << Name << cast<NamedDecl>(DC) << R; 2141 D.setInvalidType(); 2142 } 2143 } 2144 } 2145 2146 if (Previous.isSingleResult() && 2147 Previous.getFoundDecl()->isTemplateParameter()) { 2148 // Maybe we will complain about the shadowed template parameter. 2149 if (!D.isInvalidType()) 2150 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2151 Previous.getFoundDecl())) 2152 D.setInvalidType(); 2153 2154 // Just pretend that we didn't see the previous declaration. 2155 Previous.clear(); 2156 } 2157 2158 // In C++, the previous declaration we find might be a tag type 2159 // (class or enum). In this case, the new declaration will hide the 2160 // tag type. Note that this does does not apply if we're declaring a 2161 // typedef (C++ [dcl.typedef]p4). 2162 if (Previous.isSingleTagDecl() && 2163 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2164 Previous.clear(); 2165 2166 bool Redeclaration = false; 2167 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2168 if (TemplateParamLists.size()) { 2169 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2170 return DeclPtrTy(); 2171 } 2172 2173 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2174 } else if (R->isFunctionType()) { 2175 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2176 move(TemplateParamLists), 2177 IsFunctionDefinition, Redeclaration); 2178 } else { 2179 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2180 move(TemplateParamLists), 2181 Redeclaration); 2182 } 2183 2184 if (New == 0) 2185 return DeclPtrTy(); 2186 2187 // If this has an identifier and is not an invalid redeclaration or 2188 // function template specialization, add it to the scope stack. 2189 if (Name && !(Redeclaration && New->isInvalidDecl())) 2190 PushOnScopeChains(New, S); 2191 2192 return DeclPtrTy::make(New); 2193} 2194 2195/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2196/// types into constant array types in certain situations which would otherwise 2197/// be errors (for GCC compatibility). 2198static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2199 ASTContext &Context, 2200 bool &SizeIsNegative) { 2201 // This method tries to turn a variable array into a constant 2202 // array even when the size isn't an ICE. This is necessary 2203 // for compatibility with code that depends on gcc's buggy 2204 // constant expression folding, like struct {char x[(int)(char*)2];} 2205 SizeIsNegative = false; 2206 2207 QualifierCollector Qs; 2208 const Type *Ty = Qs.strip(T); 2209 2210 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2211 QualType Pointee = PTy->getPointeeType(); 2212 QualType FixedType = 2213 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 2214 if (FixedType.isNull()) return FixedType; 2215 FixedType = Context.getPointerType(FixedType); 2216 return Qs.apply(FixedType); 2217 } 2218 2219 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2220 if (!VLATy) 2221 return QualType(); 2222 // FIXME: We should probably handle this case 2223 if (VLATy->getElementType()->isVariablyModifiedType()) 2224 return QualType(); 2225 2226 Expr::EvalResult EvalResult; 2227 if (!VLATy->getSizeExpr() || 2228 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2229 !EvalResult.Val.isInt()) 2230 return QualType(); 2231 2232 llvm::APSInt &Res = EvalResult.Val.getInt(); 2233 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 2234 // TODO: preserve the size expression in declarator info 2235 return Context.getConstantArrayType(VLATy->getElementType(), 2236 Res, ArrayType::Normal, 0); 2237 } 2238 2239 SizeIsNegative = true; 2240 return QualType(); 2241} 2242 2243/// \brief Register the given locally-scoped external C declaration so 2244/// that it can be found later for redeclarations 2245void 2246Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2247 const LookupResult &Previous, 2248 Scope *S) { 2249 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2250 "Decl is not a locally-scoped decl!"); 2251 // Note that we have a locally-scoped external with this name. 2252 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2253 2254 if (!Previous.isSingleResult()) 2255 return; 2256 2257 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2258 2259 // If there was a previous declaration of this variable, it may be 2260 // in our identifier chain. Update the identifier chain with the new 2261 // declaration. 2262 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2263 // The previous declaration was found on the identifer resolver 2264 // chain, so remove it from its scope. 2265 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 2266 S = S->getParent(); 2267 2268 if (S) 2269 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 2270 } 2271} 2272 2273/// \brief Diagnose function specifiers on a declaration of an identifier that 2274/// does not identify a function. 2275void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2276 // FIXME: We should probably indicate the identifier in question to avoid 2277 // confusion for constructs like "inline int a(), b;" 2278 if (D.getDeclSpec().isInlineSpecified()) 2279 Diag(D.getDeclSpec().getInlineSpecLoc(), 2280 diag::err_inline_non_function); 2281 2282 if (D.getDeclSpec().isVirtualSpecified()) 2283 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2284 diag::err_virtual_non_function); 2285 2286 if (D.getDeclSpec().isExplicitSpecified()) 2287 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2288 diag::err_explicit_non_function); 2289} 2290 2291NamedDecl* 2292Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2293 QualType R, TypeSourceInfo *TInfo, 2294 LookupResult &Previous, bool &Redeclaration) { 2295 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2296 if (D.getCXXScopeSpec().isSet()) { 2297 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2298 << D.getCXXScopeSpec().getRange(); 2299 D.setInvalidType(); 2300 // Pretend we didn't see the scope specifier. 2301 DC = CurContext; 2302 Previous.clear(); 2303 } 2304 2305 if (getLangOptions().CPlusPlus) { 2306 // Check that there are no default arguments (C++ only). 2307 CheckExtraCXXDefaultArguments(D); 2308 } 2309 2310 DiagnoseFunctionSpecifiers(D); 2311 2312 if (D.getDeclSpec().isThreadSpecified()) 2313 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2314 2315 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2316 if (!NewTD) return 0; 2317 2318 // Handle attributes prior to checking for duplicates in MergeVarDecl 2319 ProcessDeclAttributes(S, NewTD, D); 2320 2321 // Merge the decl with the existing one if appropriate. If the decl is 2322 // in an outer scope, it isn't the same thing. 2323 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2324 if (!Previous.empty()) { 2325 Redeclaration = true; 2326 MergeTypeDefDecl(NewTD, Previous); 2327 } 2328 2329 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2330 // then it shall have block scope. 2331 QualType T = NewTD->getUnderlyingType(); 2332 if (T->isVariablyModifiedType()) { 2333 FunctionNeedsScopeChecking() = true; 2334 2335 if (S->getFnParent() == 0) { 2336 bool SizeIsNegative; 2337 QualType FixedTy = 2338 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2339 if (!FixedTy.isNull()) { 2340 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2341 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2342 } else { 2343 if (SizeIsNegative) 2344 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2345 else if (T->isVariableArrayType()) 2346 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2347 else 2348 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2349 NewTD->setInvalidDecl(); 2350 } 2351 } 2352 } 2353 2354 // If this is the C FILE type, notify the AST context. 2355 if (IdentifierInfo *II = NewTD->getIdentifier()) 2356 if (!NewTD->isInvalidDecl() && 2357 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 2358 if (II->isStr("FILE")) 2359 Context.setFILEDecl(NewTD); 2360 else if (II->isStr("jmp_buf")) 2361 Context.setjmp_bufDecl(NewTD); 2362 else if (II->isStr("sigjmp_buf")) 2363 Context.setsigjmp_bufDecl(NewTD); 2364 } 2365 2366 return NewTD; 2367} 2368 2369/// \brief Determines whether the given declaration is an out-of-scope 2370/// previous declaration. 2371/// 2372/// This routine should be invoked when name lookup has found a 2373/// previous declaration (PrevDecl) that is not in the scope where a 2374/// new declaration by the same name is being introduced. If the new 2375/// declaration occurs in a local scope, previous declarations with 2376/// linkage may still be considered previous declarations (C99 2377/// 6.2.2p4-5, C++ [basic.link]p6). 2378/// 2379/// \param PrevDecl the previous declaration found by name 2380/// lookup 2381/// 2382/// \param DC the context in which the new declaration is being 2383/// declared. 2384/// 2385/// \returns true if PrevDecl is an out-of-scope previous declaration 2386/// for a new delcaration with the same name. 2387static bool 2388isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2389 ASTContext &Context) { 2390 if (!PrevDecl) 2391 return 0; 2392 2393 if (!PrevDecl->hasLinkage()) 2394 return false; 2395 2396 if (Context.getLangOptions().CPlusPlus) { 2397 // C++ [basic.link]p6: 2398 // If there is a visible declaration of an entity with linkage 2399 // having the same name and type, ignoring entities declared 2400 // outside the innermost enclosing namespace scope, the block 2401 // scope declaration declares that same entity and receives the 2402 // linkage of the previous declaration. 2403 DeclContext *OuterContext = DC->getLookupContext(); 2404 if (!OuterContext->isFunctionOrMethod()) 2405 // This rule only applies to block-scope declarations. 2406 return false; 2407 else { 2408 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2409 if (PrevOuterContext->isRecord()) 2410 // We found a member function: ignore it. 2411 return false; 2412 else { 2413 // Find the innermost enclosing namespace for the new and 2414 // previous declarations. 2415 while (!OuterContext->isFileContext()) 2416 OuterContext = OuterContext->getParent(); 2417 while (!PrevOuterContext->isFileContext()) 2418 PrevOuterContext = PrevOuterContext->getParent(); 2419 2420 // The previous declaration is in a different namespace, so it 2421 // isn't the same function. 2422 if (OuterContext->getPrimaryContext() != 2423 PrevOuterContext->getPrimaryContext()) 2424 return false; 2425 } 2426 } 2427 } 2428 2429 return true; 2430} 2431 2432static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 2433 CXXScopeSpec &SS = D.getCXXScopeSpec(); 2434 if (!SS.isSet()) return; 2435 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()), 2436 SS.getRange()); 2437} 2438 2439NamedDecl* 2440Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2441 QualType R, TypeSourceInfo *TInfo, 2442 LookupResult &Previous, 2443 MultiTemplateParamsArg TemplateParamLists, 2444 bool &Redeclaration) { 2445 DeclarationName Name = GetNameForDeclarator(D); 2446 2447 // Check that there are no default arguments (C++ only). 2448 if (getLangOptions().CPlusPlus) 2449 CheckExtraCXXDefaultArguments(D); 2450 2451 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 2452 assert(SCSpec != DeclSpec::SCS_typedef && 2453 "Parser allowed 'typedef' as storage class VarDecl."); 2454 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec, 0); 2455 if (SCSpec == DeclSpec::SCS_mutable) { 2456 // mutable can only appear on non-static class members, so it's always 2457 // an error here 2458 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2459 D.setInvalidType(); 2460 SC = VarDecl::None; 2461 } 2462 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 2463 VarDecl::StorageClass SCAsWritten 2464 = StorageClassSpecToVarDeclStorageClass(SCSpec, DC); 2465 2466 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2467 if (!II) { 2468 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2469 << Name.getAsString(); 2470 return 0; 2471 } 2472 2473 DiagnoseFunctionSpecifiers(D); 2474 2475 if (!DC->isRecord() && S->getFnParent() == 0) { 2476 // C99 6.9p2: The storage-class specifiers auto and register shall not 2477 // appear in the declaration specifiers in an external declaration. 2478 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 2479 2480 // If this is a register variable with an asm label specified, then this 2481 // is a GNU extension. 2482 if (SC == VarDecl::Register && D.getAsmLabel()) 2483 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2484 else 2485 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2486 D.setInvalidType(); 2487 } 2488 } 2489 if (DC->isRecord() && !CurContext->isRecord()) { 2490 // This is an out-of-line definition of a static data member. 2491 if (SC == VarDecl::Static) { 2492 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2493 diag::err_static_out_of_line) 2494 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2495 } else if (SC == VarDecl::None) 2496 SC = VarDecl::Static; 2497 } 2498 if (SC == VarDecl::Static) { 2499 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2500 if (RD->isLocalClass()) 2501 Diag(D.getIdentifierLoc(), 2502 diag::err_static_data_member_not_allowed_in_local_class) 2503 << Name << RD->getDeclName(); 2504 } 2505 } 2506 2507 // Match up the template parameter lists with the scope specifier, then 2508 // determine whether we have a template or a template specialization. 2509 bool isExplicitSpecialization = false; 2510 if (TemplateParameterList *TemplateParams 2511 = MatchTemplateParametersToScopeSpecifier( 2512 D.getDeclSpec().getSourceRange().getBegin(), 2513 D.getCXXScopeSpec(), 2514 (TemplateParameterList**)TemplateParamLists.get(), 2515 TemplateParamLists.size(), 2516 /*never a friend*/ false, 2517 isExplicitSpecialization)) { 2518 if (TemplateParams->size() > 0) { 2519 // There is no such thing as a variable template. 2520 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2521 << II 2522 << SourceRange(TemplateParams->getTemplateLoc(), 2523 TemplateParams->getRAngleLoc()); 2524 return 0; 2525 } else { 2526 // There is an extraneous 'template<>' for this variable. Complain 2527 // about it, but allow the declaration of the variable. 2528 Diag(TemplateParams->getTemplateLoc(), 2529 diag::err_template_variable_noparams) 2530 << II 2531 << SourceRange(TemplateParams->getTemplateLoc(), 2532 TemplateParams->getRAngleLoc()); 2533 2534 isExplicitSpecialization = true; 2535 } 2536 } 2537 2538 VarDecl *NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2539 II, R, TInfo, SC, SCAsWritten); 2540 2541 if (D.isInvalidType()) 2542 NewVD->setInvalidDecl(); 2543 2544 SetNestedNameSpecifier(NewVD, D); 2545 2546 if (D.getDeclSpec().isThreadSpecified()) { 2547 if (NewVD->hasLocalStorage()) 2548 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2549 else if (!Context.Target.isTLSSupported()) 2550 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2551 else 2552 NewVD->setThreadSpecified(true); 2553 } 2554 2555 // Set the lexical context. If the declarator has a C++ scope specifier, the 2556 // lexical context will be different from the semantic context. 2557 NewVD->setLexicalDeclContext(CurContext); 2558 2559 // Handle attributes prior to checking for duplicates in MergeVarDecl 2560 ProcessDeclAttributes(S, NewVD, D); 2561 2562 // Handle GNU asm-label extension (encoded as an attribute). 2563 if (Expr *E = (Expr*) D.getAsmLabel()) { 2564 // The parser guarantees this is a string. 2565 StringLiteral *SE = cast<StringLiteral>(E); 2566 NewVD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 2567 } 2568 2569 // Diagnose shadowed variables before filtering for scope. 2570 if (!D.getCXXScopeSpec().isSet()) 2571 CheckShadow(S, NewVD, Previous); 2572 2573 // Don't consider existing declarations that are in a different 2574 // scope and are out-of-semantic-context declarations (if the new 2575 // declaration has linkage). 2576 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2577 2578 // Merge the decl with the existing one if appropriate. 2579 if (!Previous.empty()) { 2580 if (Previous.isSingleResult() && 2581 isa<FieldDecl>(Previous.getFoundDecl()) && 2582 D.getCXXScopeSpec().isSet()) { 2583 // The user tried to define a non-static data member 2584 // out-of-line (C++ [dcl.meaning]p1). 2585 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2586 << D.getCXXScopeSpec().getRange(); 2587 Previous.clear(); 2588 NewVD->setInvalidDecl(); 2589 } 2590 } else if (D.getCXXScopeSpec().isSet()) { 2591 // No previous declaration in the qualifying scope. 2592 Diag(D.getIdentifierLoc(), diag::err_no_member) 2593 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2594 << D.getCXXScopeSpec().getRange(); 2595 NewVD->setInvalidDecl(); 2596 } 2597 2598 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2599 2600 // This is an explicit specialization of a static data member. Check it. 2601 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2602 CheckMemberSpecialization(NewVD, Previous)) 2603 NewVD->setInvalidDecl(); 2604 2605 // attributes declared post-definition are currently ignored 2606 if (Previous.isSingleResult()) { 2607 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2608 if (Def && (Def = Def->getDefinition()) && 2609 Def != NewVD && D.hasAttributes()) { 2610 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2611 Diag(Def->getLocation(), diag::note_previous_definition); 2612 } 2613 } 2614 2615 // If this is a locally-scoped extern C variable, update the map of 2616 // such variables. 2617 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2618 !NewVD->isInvalidDecl()) 2619 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2620 2621 return NewVD; 2622} 2623 2624/// \brief Diagnose variable or built-in function shadowing. Implements 2625/// -Wshadow. 2626/// 2627/// This method is called whenever a VarDecl is added to a "useful" 2628/// scope. 2629/// 2630/// \param S the scope in which the shadowing name is being declared 2631/// \param R the lookup of the name 2632/// 2633void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 2634 // Return if warning is ignored. 2635 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow) == Diagnostic::Ignored) 2636 return; 2637 2638 // Don't diagnose declarations at file scope. The scope might not 2639 // have a DeclContext if (e.g.) we're parsing a function prototype. 2640 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity()); 2641 if (NewDC && NewDC->isFileContext()) 2642 return; 2643 2644 // Only diagnose if we're shadowing an unambiguous field or variable. 2645 if (R.getResultKind() != LookupResult::Found) 2646 return; 2647 2648 NamedDecl* ShadowedDecl = R.getFoundDecl(); 2649 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 2650 return; 2651 2652 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 2653 2654 // Only warn about certain kinds of shadowing for class members. 2655 if (NewDC && NewDC->isRecord()) { 2656 // In particular, don't warn about shadowing non-class members. 2657 if (!OldDC->isRecord()) 2658 return; 2659 2660 // TODO: should we warn about static data members shadowing 2661 // static data members from base classes? 2662 2663 // TODO: don't diagnose for inaccessible shadowed members. 2664 // This is hard to do perfectly because we might friend the 2665 // shadowing context, but that's just a false negative. 2666 } 2667 2668 // Determine what kind of declaration we're shadowing. 2669 unsigned Kind; 2670 if (isa<RecordDecl>(OldDC)) { 2671 if (isa<FieldDecl>(ShadowedDecl)) 2672 Kind = 3; // field 2673 else 2674 Kind = 2; // static data member 2675 } else if (OldDC->isFileContext()) 2676 Kind = 1; // global 2677 else 2678 Kind = 0; // local 2679 2680 DeclarationName Name = R.getLookupName(); 2681 2682 // Emit warning and note. 2683 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 2684 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 2685} 2686 2687/// \brief Check -Wshadow without the advantage of a previous lookup. 2688void Sema::CheckShadow(Scope *S, VarDecl *D) { 2689 LookupResult R(*this, D->getDeclName(), D->getLocation(), 2690 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 2691 LookupName(R, S); 2692 CheckShadow(S, D, R); 2693} 2694 2695/// \brief Perform semantic checking on a newly-created variable 2696/// declaration. 2697/// 2698/// This routine performs all of the type-checking required for a 2699/// variable declaration once it has been built. It is used both to 2700/// check variables after they have been parsed and their declarators 2701/// have been translated into a declaration, and to check variables 2702/// that have been instantiated from a template. 2703/// 2704/// Sets NewVD->isInvalidDecl() if an error was encountered. 2705void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2706 LookupResult &Previous, 2707 bool &Redeclaration) { 2708 // If the decl is already known invalid, don't check it. 2709 if (NewVD->isInvalidDecl()) 2710 return; 2711 2712 QualType T = NewVD->getType(); 2713 2714 if (T->isObjCInterfaceType()) { 2715 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2716 return NewVD->setInvalidDecl(); 2717 } 2718 2719 // Emit an error if an address space was applied to decl with local storage. 2720 // This includes arrays of objects with address space qualifiers, but not 2721 // automatic variables that point to other address spaces. 2722 // ISO/IEC TR 18037 S5.1.2 2723 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2724 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2725 return NewVD->setInvalidDecl(); 2726 } 2727 2728 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2729 && !NewVD->hasAttr<BlocksAttr>()) 2730 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2731 2732 bool isVM = T->isVariablyModifiedType(); 2733 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2734 NewVD->hasAttr<BlocksAttr>() || 2735 // FIXME: We need to diagnose jumps passed initialized variables in C++. 2736 // However, this turns on the scope checker for everything with a variable 2737 // which may impact compile time. See if we can find a better solution 2738 // to this, perhaps only checking functions that contain gotos in C++? 2739 (LangOpts.CPlusPlus && NewVD->hasLocalStorage())) 2740 FunctionNeedsScopeChecking() = true; 2741 2742 if ((isVM && NewVD->hasLinkage()) || 2743 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2744 bool SizeIsNegative; 2745 QualType FixedTy = 2746 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2747 2748 if (FixedTy.isNull() && T->isVariableArrayType()) { 2749 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2750 // FIXME: This won't give the correct result for 2751 // int a[10][n]; 2752 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2753 2754 if (NewVD->isFileVarDecl()) 2755 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2756 << SizeRange; 2757 else if (NewVD->getStorageClass() == VarDecl::Static) 2758 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2759 << SizeRange; 2760 else 2761 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2762 << SizeRange; 2763 return NewVD->setInvalidDecl(); 2764 } 2765 2766 if (FixedTy.isNull()) { 2767 if (NewVD->isFileVarDecl()) 2768 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2769 else 2770 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2771 return NewVD->setInvalidDecl(); 2772 } 2773 2774 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2775 NewVD->setType(FixedTy); 2776 } 2777 2778 if (Previous.empty() && NewVD->isExternC()) { 2779 // Since we did not find anything by this name and we're declaring 2780 // an extern "C" variable, look for a non-visible extern "C" 2781 // declaration with the same name. 2782 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2783 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2784 if (Pos != LocallyScopedExternalDecls.end()) 2785 Previous.addDecl(Pos->second); 2786 } 2787 2788 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2789 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2790 << T; 2791 return NewVD->setInvalidDecl(); 2792 } 2793 2794 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2795 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2796 return NewVD->setInvalidDecl(); 2797 } 2798 2799 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2800 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2801 return NewVD->setInvalidDecl(); 2802 } 2803 2804 if (!Previous.empty()) { 2805 Redeclaration = true; 2806 MergeVarDecl(NewVD, Previous); 2807 } 2808} 2809 2810/// \brief Data used with FindOverriddenMethod 2811struct FindOverriddenMethodData { 2812 Sema *S; 2813 CXXMethodDecl *Method; 2814}; 2815 2816/// \brief Member lookup function that determines whether a given C++ 2817/// method overrides a method in a base class, to be used with 2818/// CXXRecordDecl::lookupInBases(). 2819static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 2820 CXXBasePath &Path, 2821 void *UserData) { 2822 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2823 2824 FindOverriddenMethodData *Data 2825 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 2826 2827 DeclarationName Name = Data->Method->getDeclName(); 2828 2829 // FIXME: Do we care about other names here too? 2830 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2831 // We really want to find the base class constructor here. 2832 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 2833 CanQualType CT = Data->S->Context.getCanonicalType(T); 2834 2835 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 2836 } 2837 2838 for (Path.Decls = BaseRecord->lookup(Name); 2839 Path.Decls.first != Path.Decls.second; 2840 ++Path.Decls.first) { 2841 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*Path.Decls.first)) { 2842 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD)) 2843 return true; 2844 } 2845 } 2846 2847 return false; 2848} 2849 2850/// AddOverriddenMethods - See if a method overrides any in the base classes, 2851/// and if so, check that it's a valid override and remember it. 2852void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2853 // Look for virtual methods in base classes that this method might override. 2854 CXXBasePaths Paths; 2855 FindOverriddenMethodData Data; 2856 Data.Method = MD; 2857 Data.S = this; 2858 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 2859 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 2860 E = Paths.found_decls_end(); I != E; ++I) { 2861 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2862 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 2863 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 2864 !CheckOverridingFunctionAttributes(MD, OldMD)) 2865 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 2866 } 2867 } 2868 } 2869} 2870 2871NamedDecl* 2872Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2873 QualType R, TypeSourceInfo *TInfo, 2874 LookupResult &Previous, 2875 MultiTemplateParamsArg TemplateParamLists, 2876 bool IsFunctionDefinition, bool &Redeclaration) { 2877 assert(R.getTypePtr()->isFunctionType()); 2878 2879 DeclarationName Name = GetNameForDeclarator(D); 2880 FunctionDecl::StorageClass SC = FunctionDecl::None; 2881 switch (D.getDeclSpec().getStorageClassSpec()) { 2882 default: assert(0 && "Unknown storage class!"); 2883 case DeclSpec::SCS_auto: 2884 case DeclSpec::SCS_register: 2885 case DeclSpec::SCS_mutable: 2886 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2887 diag::err_typecheck_sclass_func); 2888 D.setInvalidType(); 2889 break; 2890 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2891 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2892 case DeclSpec::SCS_static: { 2893 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2894 // C99 6.7.1p5: 2895 // The declaration of an identifier for a function that has 2896 // block scope shall have no explicit storage-class specifier 2897 // other than extern 2898 // See also (C++ [dcl.stc]p4). 2899 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2900 diag::err_static_block_func); 2901 SC = FunctionDecl::None; 2902 } else 2903 SC = FunctionDecl::Static; 2904 break; 2905 } 2906 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2907 } 2908 2909 if (D.getDeclSpec().isThreadSpecified()) 2910 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2911 2912 bool isFriend = D.getDeclSpec().isFriendSpecified(); 2913 bool isInline = D.getDeclSpec().isInlineSpecified(); 2914 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2915 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2916 2917 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 2918 FunctionDecl::StorageClass SCAsWritten 2919 = StorageClassSpecToFunctionDeclStorageClass(SCSpec, DC); 2920 2921 // Check that the return type is not an abstract class type. 2922 // For record types, this is done by the AbstractClassUsageDiagnoser once 2923 // the class has been completely parsed. 2924 if (!DC->isRecord() && 2925 RequireNonAbstractType(D.getIdentifierLoc(), 2926 R->getAs<FunctionType>()->getResultType(), 2927 diag::err_abstract_type_in_decl, 2928 AbstractReturnType)) 2929 D.setInvalidType(); 2930 2931 // Do not allow returning a objc interface by-value. 2932 if (R->getAs<FunctionType>()->getResultType()->isObjCInterfaceType()) { 2933 Diag(D.getIdentifierLoc(), 2934 diag::err_object_cannot_be_passed_returned_by_value) << 0 2935 << R->getAs<FunctionType>()->getResultType(); 2936 D.setInvalidType(); 2937 } 2938 2939 bool isVirtualOkay = false; 2940 FunctionDecl *NewFD; 2941 2942 if (isFriend) { 2943 // C++ [class.friend]p5 2944 // A function can be defined in a friend declaration of a 2945 // class . . . . Such a function is implicitly inline. 2946 isInline |= IsFunctionDefinition; 2947 } 2948 2949 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 2950 // This is a C++ constructor declaration. 2951 assert(DC->isRecord() && 2952 "Constructors can only be declared in a member context"); 2953 2954 R = CheckConstructorDeclarator(D, R, SC); 2955 2956 // Create the new declaration 2957 NewFD = CXXConstructorDecl::Create(Context, 2958 cast<CXXRecordDecl>(DC), 2959 D.getIdentifierLoc(), Name, R, TInfo, 2960 isExplicit, isInline, 2961 /*isImplicitlyDeclared=*/false); 2962 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2963 // This is a C++ destructor declaration. 2964 if (DC->isRecord()) { 2965 R = CheckDestructorDeclarator(D, SC); 2966 2967 NewFD = CXXDestructorDecl::Create(Context, 2968 cast<CXXRecordDecl>(DC), 2969 D.getIdentifierLoc(), Name, R, 2970 isInline, 2971 /*isImplicitlyDeclared=*/false); 2972 NewFD->setTypeSourceInfo(TInfo); 2973 2974 isVirtualOkay = true; 2975 } else { 2976 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2977 2978 // Create a FunctionDecl to satisfy the function definition parsing 2979 // code path. 2980 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2981 Name, R, TInfo, SC, SCAsWritten, isInline, 2982 /*hasPrototype=*/true); 2983 D.setInvalidType(); 2984 } 2985 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 2986 if (!DC->isRecord()) { 2987 Diag(D.getIdentifierLoc(), 2988 diag::err_conv_function_not_member); 2989 return 0; 2990 } 2991 2992 CheckConversionDeclarator(D, R, SC); 2993 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2994 D.getIdentifierLoc(), Name, R, TInfo, 2995 isInline, isExplicit); 2996 2997 isVirtualOkay = true; 2998 } else if (DC->isRecord()) { 2999 // If the of the function is the same as the name of the record, then this 3000 // must be an invalid constructor that has a return type. 3001 // (The parser checks for a return type and makes the declarator a 3002 // constructor if it has no return type). 3003 // must have an invalid constructor that has a return type 3004 if (Name.getAsIdentifierInfo() && 3005 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 3006 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 3007 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3008 << SourceRange(D.getIdentifierLoc()); 3009 return 0; 3010 } 3011 3012 bool isStatic = SC == FunctionDecl::Static; 3013 3014 // [class.free]p1: 3015 // Any allocation function for a class T is a static member 3016 // (even if not explicitly declared static). 3017 if (Name.getCXXOverloadedOperator() == OO_New || 3018 Name.getCXXOverloadedOperator() == OO_Array_New) 3019 isStatic = true; 3020 3021 // [class.free]p6 Any deallocation function for a class X is a static member 3022 // (even if not explicitly declared static). 3023 if (Name.getCXXOverloadedOperator() == OO_Delete || 3024 Name.getCXXOverloadedOperator() == OO_Array_Delete) 3025 isStatic = true; 3026 3027 // This is a C++ method declaration. 3028 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 3029 D.getIdentifierLoc(), Name, R, TInfo, 3030 isStatic, SCAsWritten, isInline); 3031 3032 isVirtualOkay = !isStatic; 3033 } else { 3034 // Determine whether the function was written with a 3035 // prototype. This true when: 3036 // - we're in C++ (where every function has a prototype), 3037 // - there is a prototype in the declarator, or 3038 // - the type R of the function is some kind of typedef or other reference 3039 // to a type name (which eventually refers to a function type). 3040 bool HasPrototype = 3041 getLangOptions().CPlusPlus || 3042 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 3043 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 3044 3045 NewFD = FunctionDecl::Create(Context, DC, 3046 D.getIdentifierLoc(), 3047 Name, R, TInfo, SC, SCAsWritten, isInline, 3048 HasPrototype); 3049 } 3050 3051 if (D.isInvalidType()) 3052 NewFD->setInvalidDecl(); 3053 3054 SetNestedNameSpecifier(NewFD, D); 3055 3056 // Set the lexical context. If the declarator has a C++ 3057 // scope specifier, or is the object of a friend declaration, the 3058 // lexical context will be different from the semantic context. 3059 NewFD->setLexicalDeclContext(CurContext); 3060 3061 // Match up the template parameter lists with the scope specifier, then 3062 // determine whether we have a template or a template specialization. 3063 FunctionTemplateDecl *FunctionTemplate = 0; 3064 bool isExplicitSpecialization = false; 3065 bool isFunctionTemplateSpecialization = false; 3066 if (TemplateParameterList *TemplateParams 3067 = MatchTemplateParametersToScopeSpecifier( 3068 D.getDeclSpec().getSourceRange().getBegin(), 3069 D.getCXXScopeSpec(), 3070 (TemplateParameterList**)TemplateParamLists.get(), 3071 TemplateParamLists.size(), 3072 isFriend, 3073 isExplicitSpecialization)) { 3074 if (TemplateParams->size() > 0) { 3075 // This is a function template 3076 3077 // Check that we can declare a template here. 3078 if (CheckTemplateDeclScope(S, TemplateParams)) 3079 return 0; 3080 3081 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 3082 NewFD->getLocation(), 3083 Name, TemplateParams, 3084 NewFD); 3085 FunctionTemplate->setLexicalDeclContext(CurContext); 3086 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 3087 } else { 3088 // This is a function template specialization. 3089 isFunctionTemplateSpecialization = true; 3090 3091 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 3092 if (isFriend && isFunctionTemplateSpecialization) { 3093 // We want to remove the "template<>", found here. 3094 SourceRange RemoveRange = TemplateParams->getSourceRange(); 3095 3096 // If we remove the template<> and the name is not a 3097 // template-id, we're actually silently creating a problem: 3098 // the friend declaration will refer to an untemplated decl, 3099 // and clearly the user wants a template specialization. So 3100 // we need to insert '<>' after the name. 3101 SourceLocation InsertLoc; 3102 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 3103 InsertLoc = D.getName().getSourceRange().getEnd(); 3104 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 3105 } 3106 3107 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 3108 << Name << RemoveRange 3109 << FixItHint::CreateRemoval(RemoveRange) 3110 << FixItHint::CreateInsertion(InsertLoc, "<>"); 3111 } 3112 } 3113 3114 // FIXME: Free this memory properly. 3115 TemplateParamLists.release(); 3116 } 3117 3118 // C++ [dcl.fct.spec]p5: 3119 // The virtual specifier shall only be used in declarations of 3120 // nonstatic class member functions that appear within a 3121 // member-specification of a class declaration; see 10.3. 3122 // 3123 if (isVirtual && !NewFD->isInvalidDecl()) { 3124 if (!isVirtualOkay) { 3125 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3126 diag::err_virtual_non_function); 3127 } else if (!CurContext->isRecord()) { 3128 // 'virtual' was specified outside of the class. 3129 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 3130 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 3131 } else { 3132 // Okay: Add virtual to the method. 3133 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 3134 CurClass->setMethodAsVirtual(NewFD); 3135 } 3136 } 3137 3138 // C++ [dcl.fct.spec]p6: 3139 // The explicit specifier shall be used only in the declaration of a 3140 // constructor or conversion function within its class definition; see 12.3.1 3141 // and 12.3.2. 3142 if (isExplicit && !NewFD->isInvalidDecl()) { 3143 if (!CurContext->isRecord()) { 3144 // 'explicit' was specified outside of the class. 3145 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3146 diag::err_explicit_out_of_class) 3147 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3148 } else if (!isa<CXXConstructorDecl>(NewFD) && 3149 !isa<CXXConversionDecl>(NewFD)) { 3150 // 'explicit' was specified on a function that wasn't a constructor 3151 // or conversion function. 3152 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3153 diag::err_explicit_non_ctor_or_conv_function) 3154 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3155 } 3156 } 3157 3158 // Filter out previous declarations that don't match the scope. 3159 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3160 3161 if (isFriend) { 3162 // DC is the namespace in which the function is being declared. 3163 assert((DC->isFileContext() || !Previous.empty()) && 3164 "previously-undeclared friend function being created " 3165 "in a non-namespace context"); 3166 3167 // For now, claim that the objects have no previous declaration. 3168 if (FunctionTemplate) { 3169 FunctionTemplate->setObjectOfFriendDecl(false); 3170 FunctionTemplate->setAccess(AS_public); 3171 } 3172 NewFD->setObjectOfFriendDecl(false); 3173 NewFD->setAccess(AS_public); 3174 } 3175 3176 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 3177 !CurContext->isRecord()) { 3178 // C++ [class.static]p1: 3179 // A data or function member of a class may be declared static 3180 // in a class definition, in which case it is a static member of 3181 // the class. 3182 3183 // Complain about the 'static' specifier if it's on an out-of-line 3184 // member function definition. 3185 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3186 diag::err_static_out_of_line) 3187 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3188 } 3189 3190 // Handle GNU asm-label extension (encoded as an attribute). 3191 if (Expr *E = (Expr*) D.getAsmLabel()) { 3192 // The parser guarantees this is a string. 3193 StringLiteral *SE = cast<StringLiteral>(E); 3194 NewFD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 3195 } 3196 3197 // Copy the parameter declarations from the declarator D to the function 3198 // declaration NewFD, if they are available. First scavenge them into Params. 3199 llvm::SmallVector<ParmVarDecl*, 16> Params; 3200 if (D.getNumTypeObjects() > 0) { 3201 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3202 3203 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 3204 // function that takes no arguments, not a function that takes a 3205 // single void argument. 3206 // We let through "const void" here because Sema::GetTypeForDeclarator 3207 // already checks for that case. 3208 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3209 FTI.ArgInfo[0].Param && 3210 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 3211 // Empty arg list, don't push any params. 3212 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 3213 3214 // In C++, the empty parameter-type-list must be spelled "void"; a 3215 // typedef of void is not permitted. 3216 if (getLangOptions().CPlusPlus && 3217 Param->getType().getUnqualifiedType() != Context.VoidTy) 3218 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 3219 // FIXME: Leaks decl? 3220 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 3221 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 3222 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 3223 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 3224 Param->setDeclContext(NewFD); 3225 Params.push_back(Param); 3226 3227 if (Param->isInvalidDecl()) 3228 NewFD->setInvalidDecl(); 3229 } 3230 } 3231 3232 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 3233 // When we're declaring a function with a typedef, typeof, etc as in the 3234 // following example, we'll need to synthesize (unnamed) 3235 // parameters for use in the declaration. 3236 // 3237 // @code 3238 // typedef void fn(int); 3239 // fn f; 3240 // @endcode 3241 3242 // Synthesize a parameter for each argument type. 3243 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3244 AE = FT->arg_type_end(); AI != AE; ++AI) { 3245 ParmVarDecl *Param = ParmVarDecl::Create(Context, NewFD, 3246 D.getIdentifierLoc(), 0, 3247 *AI, 3248 Context.getTrivialTypeSourceInfo(*AI, 3249 D.getIdentifierLoc()), 3250 VarDecl::None, 3251 VarDecl::None, 0); 3252 Param->setImplicit(); 3253 Params.push_back(Param); 3254 } 3255 } else { 3256 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 3257 "Should not need args for typedef of non-prototype fn"); 3258 } 3259 // Finally, we know we have the right number of parameters, install them. 3260 NewFD->setParams(Params.data(), Params.size()); 3261 3262 // If the declarator is a template-id, translate the parser's template 3263 // argument list into our AST format. 3264 bool HasExplicitTemplateArgs = false; 3265 TemplateArgumentListInfo TemplateArgs; 3266 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3267 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3268 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3269 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3270 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3271 TemplateId->getTemplateArgs(), 3272 TemplateId->NumArgs); 3273 translateTemplateArguments(TemplateArgsPtr, 3274 TemplateArgs); 3275 TemplateArgsPtr.release(); 3276 3277 HasExplicitTemplateArgs = true; 3278 3279 if (FunctionTemplate) { 3280 // FIXME: Diagnose function template with explicit template 3281 // arguments. 3282 HasExplicitTemplateArgs = false; 3283 } else if (!isFunctionTemplateSpecialization && 3284 !D.getDeclSpec().isFriendSpecified()) { 3285 // We have encountered something that the user meant to be a 3286 // specialization (because it has explicitly-specified template 3287 // arguments) but that was not introduced with a "template<>" (or had 3288 // too few of them). 3289 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3290 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3291 << FixItHint::CreateInsertion( 3292 D.getDeclSpec().getSourceRange().getBegin(), 3293 "template<> "); 3294 isFunctionTemplateSpecialization = true; 3295 } else { 3296 // "friend void foo<>(int);" is an implicit specialization decl. 3297 isFunctionTemplateSpecialization = true; 3298 } 3299 } else if (isFriend && isFunctionTemplateSpecialization) { 3300 // This combination is only possible in a recovery case; the user 3301 // wrote something like: 3302 // template <> friend void foo(int); 3303 // which we're recovering from as if the user had written: 3304 // friend void foo<>(int); 3305 // Go ahead and fake up a template id. 3306 HasExplicitTemplateArgs = true; 3307 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 3308 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 3309 } 3310 3311 // If it's a friend (and only if it's a friend), it's possible 3312 // that either the specialized function type or the specialized 3313 // template is dependent, and therefore matching will fail. In 3314 // this case, don't check the specialization yet. 3315 if (isFunctionTemplateSpecialization && isFriend && 3316 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 3317 assert(HasExplicitTemplateArgs && 3318 "friend function specialization without template args"); 3319 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 3320 Previous)) 3321 NewFD->setInvalidDecl(); 3322 } else if (isFunctionTemplateSpecialization) { 3323 if (CheckFunctionTemplateSpecialization(NewFD, 3324 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3325 Previous)) 3326 NewFD->setInvalidDecl(); 3327 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 3328 if (CheckMemberSpecialization(NewFD, Previous)) 3329 NewFD->setInvalidDecl(); 3330 } 3331 3332 // Perform semantic checking on the function declaration. 3333 bool OverloadableAttrRequired = false; // FIXME: HACK! 3334 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3335 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 3336 3337 assert((NewFD->isInvalidDecl() || !Redeclaration || 3338 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3339 "previous declaration set still overloaded"); 3340 3341 NamedDecl *PrincipalDecl = (FunctionTemplate 3342 ? cast<NamedDecl>(FunctionTemplate) 3343 : NewFD); 3344 3345 if (isFriend && Redeclaration) { 3346 AccessSpecifier Access = AS_public; 3347 if (!NewFD->isInvalidDecl()) 3348 Access = NewFD->getPreviousDeclaration()->getAccess(); 3349 3350 NewFD->setAccess(Access); 3351 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 3352 3353 PrincipalDecl->setObjectOfFriendDecl(true); 3354 } 3355 3356 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 3357 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 3358 PrincipalDecl->setNonMemberOperator(); 3359 3360 // If we have a function template, check the template parameter 3361 // list. This will check and merge default template arguments. 3362 if (FunctionTemplate) { 3363 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3364 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3365 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3366 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3367 : TPC_FunctionTemplate); 3368 } 3369 3370 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 3371 // Fake up an access specifier if it's supposed to be a class member. 3372 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext())) 3373 NewFD->setAccess(AS_public); 3374 3375 // An out-of-line member function declaration must also be a 3376 // definition (C++ [dcl.meaning]p1). 3377 // Note that this is not the case for explicit specializations of 3378 // function templates or member functions of class templates, per 3379 // C++ [temp.expl.spec]p2. 3380 if (!IsFunctionDefinition && !isFriend && 3381 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 3382 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 3383 << D.getCXXScopeSpec().getRange(); 3384 NewFD->setInvalidDecl(); 3385 } else if (!Redeclaration && 3386 !(isFriend && CurContext->isDependentContext())) { 3387 // The user tried to provide an out-of-line definition for a 3388 // function that is a member of a class or namespace, but there 3389 // was no such member function declared (C++ [class.mfct]p2, 3390 // C++ [namespace.memdef]p2). For example: 3391 // 3392 // class X { 3393 // void f() const; 3394 // }; 3395 // 3396 // void X::f() { } // ill-formed 3397 // 3398 // Complain about this problem, and attempt to suggest close 3399 // matches (e.g., those that differ only in cv-qualifiers and 3400 // whether the parameter types are references). 3401 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3402 << Name << DC << D.getCXXScopeSpec().getRange(); 3403 NewFD->setInvalidDecl(); 3404 3405 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 3406 ForRedeclaration); 3407 LookupQualifiedName(Prev, DC); 3408 assert(!Prev.isAmbiguous() && 3409 "Cannot have an ambiguity in previous-declaration lookup"); 3410 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3411 Func != FuncEnd; ++Func) { 3412 if (isa<FunctionDecl>(*Func) && 3413 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 3414 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3415 } 3416 } 3417 } 3418 3419 // Handle attributes. We need to have merged decls when handling attributes 3420 // (for example to check for conflicts, etc). 3421 // FIXME: This needs to happen before we merge declarations. Then, 3422 // let attribute merging cope with attribute conflicts. 3423 ProcessDeclAttributes(S, NewFD, D); 3424 3425 // attributes declared post-definition are currently ignored 3426 if (Redeclaration && Previous.isSingleResult()) { 3427 const FunctionDecl *Def; 3428 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3429 if (PrevFD && PrevFD->getBody(Def) && D.hasAttributes()) { 3430 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3431 Diag(Def->getLocation(), diag::note_previous_definition); 3432 } 3433 } 3434 3435 AddKnownFunctionAttributes(NewFD); 3436 3437 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 3438 // If a function name is overloadable in C, then every function 3439 // with that name must be marked "overloadable". 3440 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3441 << Redeclaration << NewFD; 3442 if (!Previous.empty()) 3443 Diag(Previous.getRepresentativeDecl()->getLocation(), 3444 diag::note_attribute_overloadable_prev_overload); 3445 NewFD->addAttr(::new (Context) OverloadableAttr()); 3446 } 3447 3448 // If this is a locally-scoped extern C function, update the 3449 // map of such names. 3450 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3451 && !NewFD->isInvalidDecl()) 3452 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3453 3454 // Set this FunctionDecl's range up to the right paren. 3455 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3456 3457 if (FunctionTemplate && NewFD->isInvalidDecl()) 3458 FunctionTemplate->setInvalidDecl(); 3459 3460 if (FunctionTemplate) 3461 return FunctionTemplate; 3462 3463 3464 // Keep track of static, non-inlined function definitions that 3465 // have not been used. We will warn later. 3466 // FIXME: Also include static functions declared but not defined. 3467 if (!NewFD->isInvalidDecl() && IsFunctionDefinition 3468 && !NewFD->isInlined() && NewFD->getLinkage() == InternalLinkage 3469 && !NewFD->isUsed() && !NewFD->hasAttr<UnusedAttr>() 3470 && !NewFD->hasAttr<ConstructorAttr>() 3471 && !NewFD->hasAttr<DestructorAttr>()) 3472 UnusedStaticFuncs.push_back(NewFD); 3473 3474 return NewFD; 3475} 3476 3477/// \brief Perform semantic checking of a new function declaration. 3478/// 3479/// Performs semantic analysis of the new function declaration 3480/// NewFD. This routine performs all semantic checking that does not 3481/// require the actual declarator involved in the declaration, and is 3482/// used both for the declaration of functions as they are parsed 3483/// (called via ActOnDeclarator) and for the declaration of functions 3484/// that have been instantiated via C++ template instantiation (called 3485/// via InstantiateDecl). 3486/// 3487/// \param IsExplicitSpecialiation whether this new function declaration is 3488/// an explicit specialization of the previous declaration. 3489/// 3490/// This sets NewFD->isInvalidDecl() to true if there was an error. 3491void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3492 LookupResult &Previous, 3493 bool IsExplicitSpecialization, 3494 bool &Redeclaration, 3495 bool &OverloadableAttrRequired) { 3496 // If NewFD is already known erroneous, don't do any of this checking. 3497 if (NewFD->isInvalidDecl()) 3498 return; 3499 3500 if (NewFD->getResultType()->isVariablyModifiedType()) { 3501 // Functions returning a variably modified type violate C99 6.7.5.2p2 3502 // because all functions have linkage. 3503 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3504 return NewFD->setInvalidDecl(); 3505 } 3506 3507 if (NewFD->isMain()) 3508 CheckMain(NewFD); 3509 3510 // Check for a previous declaration of this name. 3511 if (Previous.empty() && NewFD->isExternC()) { 3512 // Since we did not find anything by this name and we're declaring 3513 // an extern "C" function, look for a non-visible extern "C" 3514 // declaration with the same name. 3515 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3516 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3517 if (Pos != LocallyScopedExternalDecls.end()) 3518 Previous.addDecl(Pos->second); 3519 } 3520 3521 // Merge or overload the declaration with an existing declaration of 3522 // the same name, if appropriate. 3523 if (!Previous.empty()) { 3524 // Determine whether NewFD is an overload of PrevDecl or 3525 // a declaration that requires merging. If it's an overload, 3526 // there's no more work to do here; we'll just add the new 3527 // function to the scope. 3528 3529 NamedDecl *OldDecl = 0; 3530 if (!AllowOverloadingOfFunction(Previous, Context)) { 3531 Redeclaration = true; 3532 OldDecl = Previous.getFoundDecl(); 3533 } else { 3534 if (!getLangOptions().CPlusPlus) { 3535 OverloadableAttrRequired = true; 3536 3537 // Functions marked "overloadable" must have a prototype (that 3538 // we can't get through declaration merging). 3539 if (!NewFD->getType()->getAs<FunctionProtoType>()) { 3540 Diag(NewFD->getLocation(), 3541 diag::err_attribute_overloadable_no_prototype) 3542 << NewFD; 3543 Redeclaration = true; 3544 3545 // Turn this into a variadic function with no parameters. 3546 QualType R = Context.getFunctionType( 3547 NewFD->getType()->getAs<FunctionType>()->getResultType(), 3548 0, 0, true, 0, false, false, 0, 0, 3549 FunctionType::ExtInfo()); 3550 NewFD->setType(R); 3551 return NewFD->setInvalidDecl(); 3552 } 3553 } 3554 3555 switch (CheckOverload(NewFD, Previous, OldDecl)) { 3556 case Ovl_Match: 3557 Redeclaration = true; 3558 if (isa<UsingShadowDecl>(OldDecl) && CurContext->isRecord()) { 3559 HideUsingShadowDecl(S, cast<UsingShadowDecl>(OldDecl)); 3560 Redeclaration = false; 3561 } 3562 break; 3563 3564 case Ovl_NonFunction: 3565 Redeclaration = true; 3566 break; 3567 3568 case Ovl_Overload: 3569 Redeclaration = false; 3570 break; 3571 } 3572 } 3573 3574 if (Redeclaration) { 3575 // NewFD and OldDecl represent declarations that need to be 3576 // merged. 3577 if (MergeFunctionDecl(NewFD, OldDecl)) 3578 return NewFD->setInvalidDecl(); 3579 3580 Previous.clear(); 3581 Previous.addDecl(OldDecl); 3582 3583 if (FunctionTemplateDecl *OldTemplateDecl 3584 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3585 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3586 FunctionTemplateDecl *NewTemplateDecl 3587 = NewFD->getDescribedFunctionTemplate(); 3588 assert(NewTemplateDecl && "Template/non-template mismatch"); 3589 if (CXXMethodDecl *Method 3590 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3591 Method->setAccess(OldTemplateDecl->getAccess()); 3592 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3593 } 3594 3595 // If this is an explicit specialization of a member that is a function 3596 // template, mark it as a member specialization. 3597 if (IsExplicitSpecialization && 3598 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3599 NewTemplateDecl->setMemberSpecialization(); 3600 assert(OldTemplateDecl->isMemberSpecialization()); 3601 } 3602 } else { 3603 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3604 NewFD->setAccess(OldDecl->getAccess()); 3605 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3606 } 3607 } 3608 } 3609 3610 // Semantic checking for this function declaration (in isolation). 3611 if (getLangOptions().CPlusPlus) { 3612 // C++-specific checks. 3613 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3614 CheckConstructor(Constructor); 3615 } else if (CXXDestructorDecl *Destructor = 3616 dyn_cast<CXXDestructorDecl>(NewFD)) { 3617 CXXRecordDecl *Record = Destructor->getParent(); 3618 QualType ClassType = Context.getTypeDeclType(Record); 3619 3620 // FIXME: Shouldn't we be able to perform thisc heck even when the class 3621 // type is dependent? Both gcc and edg can handle that. 3622 if (!ClassType->isDependentType()) { 3623 DeclarationName Name 3624 = Context.DeclarationNames.getCXXDestructorName( 3625 Context.getCanonicalType(ClassType)); 3626 if (NewFD->getDeclName() != Name) { 3627 Diag(NewFD->getLocation(), diag::err_destructor_name); 3628 return NewFD->setInvalidDecl(); 3629 } 3630 } 3631 3632 Record->setUserDeclaredDestructor(true); 3633 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3634 // user-defined destructor. 3635 Record->setPOD(false); 3636 3637 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3638 // declared destructor. 3639 // FIXME: C++0x: don't do this for "= default" destructors 3640 Record->setHasTrivialDestructor(false); 3641 } else if (CXXConversionDecl *Conversion 3642 = dyn_cast<CXXConversionDecl>(NewFD)) { 3643 ActOnConversionDeclarator(Conversion); 3644 } 3645 3646 // Find any virtual functions that this function overrides. 3647 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3648 if (!Method->isFunctionTemplateSpecialization() && 3649 !Method->getDescribedFunctionTemplate()) 3650 AddOverriddenMethods(Method->getParent(), Method); 3651 } 3652 3653 // Additional checks for the destructor; make sure we do this after we 3654 // figure out whether the destructor is virtual. 3655 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(NewFD)) 3656 if (!Destructor->getParent()->isDependentType()) 3657 CheckDestructor(Destructor); 3658 3659 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3660 if (NewFD->isOverloadedOperator() && 3661 CheckOverloadedOperatorDeclaration(NewFD)) 3662 return NewFD->setInvalidDecl(); 3663 3664 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3665 if (NewFD->getLiteralIdentifier() && 3666 CheckLiteralOperatorDeclaration(NewFD)) 3667 return NewFD->setInvalidDecl(); 3668 3669 // In C++, check default arguments now that we have merged decls. Unless 3670 // the lexical context is the class, because in this case this is done 3671 // during delayed parsing anyway. 3672 if (!CurContext->isRecord()) 3673 CheckCXXDefaultArguments(NewFD); 3674 } 3675} 3676 3677void Sema::CheckMain(FunctionDecl* FD) { 3678 // C++ [basic.start.main]p3: A program that declares main to be inline 3679 // or static is ill-formed. 3680 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3681 // shall not appear in a declaration of main. 3682 // static main is not an error under C99, but we should warn about it. 3683 bool isInline = FD->isInlineSpecified(); 3684 bool isStatic = FD->getStorageClass() == FunctionDecl::Static; 3685 if (isInline || isStatic) { 3686 unsigned diagID = diag::warn_unusual_main_decl; 3687 if (isInline || getLangOptions().CPlusPlus) 3688 diagID = diag::err_unusual_main_decl; 3689 3690 int which = isStatic + (isInline << 1) - 1; 3691 Diag(FD->getLocation(), diagID) << which; 3692 } 3693 3694 QualType T = FD->getType(); 3695 assert(T->isFunctionType() && "function decl is not of function type"); 3696 const FunctionType* FT = T->getAs<FunctionType>(); 3697 3698 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3699 // TODO: add a replacement fixit to turn the return type into 'int'. 3700 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3701 FD->setInvalidDecl(true); 3702 } 3703 3704 // Treat protoless main() as nullary. 3705 if (isa<FunctionNoProtoType>(FT)) return; 3706 3707 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3708 unsigned nparams = FTP->getNumArgs(); 3709 assert(FD->getNumParams() == nparams); 3710 3711 bool HasExtraParameters = (nparams > 3); 3712 3713 // Darwin passes an undocumented fourth argument of type char**. If 3714 // other platforms start sprouting these, the logic below will start 3715 // getting shifty. 3716 if (nparams == 4 && 3717 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 3718 HasExtraParameters = false; 3719 3720 if (HasExtraParameters) { 3721 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 3722 FD->setInvalidDecl(true); 3723 nparams = 3; 3724 } 3725 3726 // FIXME: a lot of the following diagnostics would be improved 3727 // if we had some location information about types. 3728 3729 QualType CharPP = 3730 Context.getPointerType(Context.getPointerType(Context.CharTy)); 3731 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 3732 3733 for (unsigned i = 0; i < nparams; ++i) { 3734 QualType AT = FTP->getArgType(i); 3735 3736 bool mismatch = true; 3737 3738 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 3739 mismatch = false; 3740 else if (Expected[i] == CharPP) { 3741 // As an extension, the following forms are okay: 3742 // char const ** 3743 // char const * const * 3744 // char * const * 3745 3746 QualifierCollector qs; 3747 const PointerType* PT; 3748 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 3749 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 3750 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 3751 qs.removeConst(); 3752 mismatch = !qs.empty(); 3753 } 3754 } 3755 3756 if (mismatch) { 3757 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 3758 // TODO: suggest replacing given type with expected type 3759 FD->setInvalidDecl(true); 3760 } 3761 } 3762 3763 if (nparams == 1 && !FD->isInvalidDecl()) { 3764 Diag(FD->getLocation(), diag::warn_main_one_arg); 3765 } 3766} 3767 3768bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 3769 // FIXME: Need strict checking. In C89, we need to check for 3770 // any assignment, increment, decrement, function-calls, or 3771 // commas outside of a sizeof. In C99, it's the same list, 3772 // except that the aforementioned are allowed in unevaluated 3773 // expressions. Everything else falls under the 3774 // "may accept other forms of constant expressions" exception. 3775 // (We never end up here for C++, so the constant expression 3776 // rules there don't matter.) 3777 if (Init->isConstantInitializer(Context)) 3778 return false; 3779 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 3780 << Init->getSourceRange(); 3781 return true; 3782} 3783 3784void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 3785 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 3786} 3787 3788/// AddInitializerToDecl - Adds the initializer Init to the 3789/// declaration dcl. If DirectInit is true, this is C++ direct 3790/// initialization rather than copy initialization. 3791void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 3792 Decl *RealDecl = dcl.getAs<Decl>(); 3793 // If there is no declaration, there was an error parsing it. Just ignore 3794 // the initializer. 3795 if (RealDecl == 0) 3796 return; 3797 3798 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 3799 // With declarators parsed the way they are, the parser cannot 3800 // distinguish between a normal initializer and a pure-specifier. 3801 // Thus this grotesque test. 3802 IntegerLiteral *IL; 3803 Expr *Init = static_cast<Expr *>(init.get()); 3804 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 3805 Context.getCanonicalType(IL->getType()) == Context.IntTy) 3806 CheckPureMethod(Method, Init->getSourceRange()); 3807 else { 3808 Diag(Method->getLocation(), diag::err_member_function_initialization) 3809 << Method->getDeclName() << Init->getSourceRange(); 3810 Method->setInvalidDecl(); 3811 } 3812 return; 3813 } 3814 3815 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3816 if (!VDecl) { 3817 if (getLangOptions().CPlusPlus && 3818 RealDecl->getLexicalDeclContext()->isRecord() && 3819 isa<NamedDecl>(RealDecl)) 3820 Diag(RealDecl->getLocation(), diag::err_member_initialization) 3821 << cast<NamedDecl>(RealDecl)->getDeclName(); 3822 else 3823 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3824 RealDecl->setInvalidDecl(); 3825 return; 3826 } 3827 3828 // A definition must end up with a complete type, which means it must be 3829 // complete with the restriction that an array type might be completed by the 3830 // initializer; note that later code assumes this restriction. 3831 QualType BaseDeclType = VDecl->getType(); 3832 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 3833 BaseDeclType = Array->getElementType(); 3834 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 3835 diag::err_typecheck_decl_incomplete_type)) { 3836 RealDecl->setInvalidDecl(); 3837 return; 3838 } 3839 3840 // The variable can not have an abstract class type. 3841 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 3842 diag::err_abstract_type_in_decl, 3843 AbstractVariableType)) 3844 VDecl->setInvalidDecl(); 3845 3846 const VarDecl *Def; 3847 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 3848 Diag(VDecl->getLocation(), diag::err_redefinition) 3849 << VDecl->getDeclName(); 3850 Diag(Def->getLocation(), diag::note_previous_definition); 3851 VDecl->setInvalidDecl(); 3852 return; 3853 } 3854 3855 // Take ownership of the expression, now that we're sure we have somewhere 3856 // to put it. 3857 Expr *Init = init.takeAs<Expr>(); 3858 assert(Init && "missing initializer"); 3859 3860 // Capture the variable that is being initialized and the style of 3861 // initialization. 3862 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 3863 3864 // FIXME: Poor source location information. 3865 InitializationKind Kind 3866 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 3867 Init->getLocStart(), 3868 Init->getLocEnd()) 3869 : InitializationKind::CreateCopy(VDecl->getLocation(), 3870 Init->getLocStart()); 3871 3872 // Get the decls type and save a reference for later, since 3873 // CheckInitializerTypes may change it. 3874 QualType DclT = VDecl->getType(), SavT = DclT; 3875 if (VDecl->isBlockVarDecl()) { 3876 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 3877 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 3878 VDecl->setInvalidDecl(); 3879 } else if (!VDecl->isInvalidDecl()) { 3880 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3881 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3882 MultiExprArg(*this, (void**)&Init, 1), 3883 &DclT); 3884 if (Result.isInvalid()) { 3885 VDecl->setInvalidDecl(); 3886 return; 3887 } 3888 3889 Init = Result.takeAs<Expr>(); 3890 3891 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3892 // Don't check invalid declarations to avoid emitting useless diagnostics. 3893 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3894 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 3895 CheckForConstantInitializer(Init, DclT); 3896 } 3897 } 3898 } else if (VDecl->isStaticDataMember() && 3899 VDecl->getLexicalDeclContext()->isRecord()) { 3900 // This is an in-class initialization for a static data member, e.g., 3901 // 3902 // struct S { 3903 // static const int value = 17; 3904 // }; 3905 3906 // Attach the initializer 3907 VDecl->setInit(Init); 3908 3909 // C++ [class.mem]p4: 3910 // A member-declarator can contain a constant-initializer only 3911 // if it declares a static member (9.4) of const integral or 3912 // const enumeration type, see 9.4.2. 3913 QualType T = VDecl->getType(); 3914 if (!T->isDependentType() && 3915 (!Context.getCanonicalType(T).isConstQualified() || 3916 !T->isIntegralType())) { 3917 Diag(VDecl->getLocation(), diag::err_member_initialization) 3918 << VDecl->getDeclName() << Init->getSourceRange(); 3919 VDecl->setInvalidDecl(); 3920 } else { 3921 // C++ [class.static.data]p4: 3922 // If a static data member is of const integral or const 3923 // enumeration type, its declaration in the class definition 3924 // can specify a constant-initializer which shall be an 3925 // integral constant expression (5.19). 3926 if (!Init->isTypeDependent() && 3927 !Init->getType()->isIntegralType()) { 3928 // We have a non-dependent, non-integral or enumeration type. 3929 Diag(Init->getSourceRange().getBegin(), 3930 diag::err_in_class_initializer_non_integral_type) 3931 << Init->getType() << Init->getSourceRange(); 3932 VDecl->setInvalidDecl(); 3933 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 3934 // Check whether the expression is a constant expression. 3935 llvm::APSInt Value; 3936 SourceLocation Loc; 3937 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 3938 Diag(Loc, diag::err_in_class_initializer_non_constant) 3939 << Init->getSourceRange(); 3940 VDecl->setInvalidDecl(); 3941 } else if (!VDecl->getType()->isDependentType()) 3942 ImpCastExprToType(Init, VDecl->getType(), CastExpr::CK_IntegralCast); 3943 } 3944 } 3945 } else if (VDecl->isFileVarDecl()) { 3946 if (VDecl->getStorageClass() == VarDecl::Extern && 3947 (!getLangOptions().CPlusPlus || 3948 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 3949 Diag(VDecl->getLocation(), diag::warn_extern_init); 3950 if (!VDecl->isInvalidDecl()) { 3951 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3952 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3953 MultiExprArg(*this, (void**)&Init, 1), 3954 &DclT); 3955 if (Result.isInvalid()) { 3956 VDecl->setInvalidDecl(); 3957 return; 3958 } 3959 3960 Init = Result.takeAs<Expr>(); 3961 } 3962 3963 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3964 // Don't check invalid declarations to avoid emitting useless diagnostics. 3965 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3966 // C99 6.7.8p4. All file scoped initializers need to be constant. 3967 CheckForConstantInitializer(Init, DclT); 3968 } 3969 } 3970 // If the type changed, it means we had an incomplete type that was 3971 // completed by the initializer. For example: 3972 // int ary[] = { 1, 3, 5 }; 3973 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 3974 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 3975 VDecl->setType(DclT); 3976 Init->setType(DclT); 3977 } 3978 3979 Init = MaybeCreateCXXExprWithTemporaries(Init); 3980 // Attach the initializer to the decl. 3981 VDecl->setInit(Init); 3982 3983 if (getLangOptions().CPlusPlus) { 3984 // Make sure we mark the destructor as used if necessary. 3985 QualType InitType = VDecl->getType(); 3986 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 3987 InitType = Context.getBaseElementType(Array); 3988 if (const RecordType *Record = InitType->getAs<RecordType>()) 3989 FinalizeVarWithDestructor(VDecl, Record); 3990 } 3991 3992 return; 3993} 3994 3995/// ActOnInitializerError - Given that there was an error parsing an 3996/// initializer for the given declaration, try to return to some form 3997/// of sanity. 3998void Sema::ActOnInitializerError(DeclPtrTy dcl) { 3999 // Our main concern here is re-establishing invariants like "a 4000 // variable's type is either dependent or complete". 4001 Decl *D = dcl.getAs<Decl>(); 4002 if (!D || D->isInvalidDecl()) return; 4003 4004 VarDecl *VD = dyn_cast<VarDecl>(D); 4005 if (!VD) return; 4006 4007 QualType Ty = VD->getType(); 4008 if (Ty->isDependentType()) return; 4009 4010 // Require a complete type. 4011 if (RequireCompleteType(VD->getLocation(), 4012 Context.getBaseElementType(Ty), 4013 diag::err_typecheck_decl_incomplete_type)) { 4014 VD->setInvalidDecl(); 4015 return; 4016 } 4017 4018 // Require an abstract type. 4019 if (RequireNonAbstractType(VD->getLocation(), Ty, 4020 diag::err_abstract_type_in_decl, 4021 AbstractVariableType)) { 4022 VD->setInvalidDecl(); 4023 return; 4024 } 4025 4026 // Don't bother complaining about constructors or destructors, 4027 // though. 4028} 4029 4030void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 4031 bool TypeContainsUndeducedAuto) { 4032 Decl *RealDecl = dcl.getAs<Decl>(); 4033 4034 // If there is no declaration, there was an error parsing it. Just ignore it. 4035 if (RealDecl == 0) 4036 return; 4037 4038 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 4039 QualType Type = Var->getType(); 4040 4041 // C++0x [dcl.spec.auto]p3 4042 if (TypeContainsUndeducedAuto) { 4043 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 4044 << Var->getDeclName() << Type; 4045 Var->setInvalidDecl(); 4046 return; 4047 } 4048 4049 switch (Var->isThisDeclarationADefinition()) { 4050 case VarDecl::Definition: 4051 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 4052 break; 4053 4054 // We have an out-of-line definition of a static data member 4055 // that has an in-class initializer, so we type-check this like 4056 // a declaration. 4057 // 4058 // Fall through 4059 4060 case VarDecl::DeclarationOnly: 4061 // It's only a declaration. 4062 4063 // Block scope. C99 6.7p7: If an identifier for an object is 4064 // declared with no linkage (C99 6.2.2p6), the type for the 4065 // object shall be complete. 4066 if (!Type->isDependentType() && Var->isBlockVarDecl() && 4067 !Var->getLinkage() && !Var->isInvalidDecl() && 4068 RequireCompleteType(Var->getLocation(), Type, 4069 diag::err_typecheck_decl_incomplete_type)) 4070 Var->setInvalidDecl(); 4071 4072 // Make sure that the type is not abstract. 4073 if (!Type->isDependentType() && !Var->isInvalidDecl() && 4074 RequireNonAbstractType(Var->getLocation(), Type, 4075 diag::err_abstract_type_in_decl, 4076 AbstractVariableType)) 4077 Var->setInvalidDecl(); 4078 return; 4079 4080 case VarDecl::TentativeDefinition: 4081 // File scope. C99 6.9.2p2: A declaration of an identifier for an 4082 // object that has file scope without an initializer, and without a 4083 // storage-class specifier or with the storage-class specifier "static", 4084 // constitutes a tentative definition. Note: A tentative definition with 4085 // external linkage is valid (C99 6.2.2p5). 4086 if (!Var->isInvalidDecl()) { 4087 if (const IncompleteArrayType *ArrayT 4088 = Context.getAsIncompleteArrayType(Type)) { 4089 if (RequireCompleteType(Var->getLocation(), 4090 ArrayT->getElementType(), 4091 diag::err_illegal_decl_array_incomplete_type)) 4092 Var->setInvalidDecl(); 4093 } else if (Var->getStorageClass() == VarDecl::Static) { 4094 // C99 6.9.2p3: If the declaration of an identifier for an object is 4095 // a tentative definition and has internal linkage (C99 6.2.2p3), the 4096 // declared type shall not be an incomplete type. 4097 // NOTE: code such as the following 4098 // static struct s; 4099 // struct s { int a; }; 4100 // is accepted by gcc. Hence here we issue a warning instead of 4101 // an error and we do not invalidate the static declaration. 4102 // NOTE: to avoid multiple warnings, only check the first declaration. 4103 if (Var->getPreviousDeclaration() == 0) 4104 RequireCompleteType(Var->getLocation(), Type, 4105 diag::ext_typecheck_decl_incomplete_type); 4106 } 4107 } 4108 4109 // Record the tentative definition; we're done. 4110 if (!Var->isInvalidDecl()) 4111 TentativeDefinitions.push_back(Var); 4112 return; 4113 } 4114 4115 // Provide a specific diagnostic for uninitialized variable 4116 // definitions with incomplete array type. 4117 if (Type->isIncompleteArrayType()) { 4118 Diag(Var->getLocation(), 4119 diag::err_typecheck_incomplete_array_needs_initializer); 4120 Var->setInvalidDecl(); 4121 return; 4122 } 4123 4124 // Provide a specific diagnostic for uninitialized variable 4125 // definitions with reference type. 4126 if (Type->isReferenceType()) { 4127 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 4128 << Var->getDeclName() 4129 << SourceRange(Var->getLocation(), Var->getLocation()); 4130 Var->setInvalidDecl(); 4131 return; 4132 } 4133 4134 // Do not attempt to type-check the default initializer for a 4135 // variable with dependent type. 4136 if (Type->isDependentType()) 4137 return; 4138 4139 if (Var->isInvalidDecl()) 4140 return; 4141 4142 if (RequireCompleteType(Var->getLocation(), 4143 Context.getBaseElementType(Type), 4144 diag::err_typecheck_decl_incomplete_type)) { 4145 Var->setInvalidDecl(); 4146 return; 4147 } 4148 4149 // The variable can not have an abstract class type. 4150 if (RequireNonAbstractType(Var->getLocation(), Type, 4151 diag::err_abstract_type_in_decl, 4152 AbstractVariableType)) { 4153 Var->setInvalidDecl(); 4154 return; 4155 } 4156 4157 const RecordType *Record 4158 = Context.getBaseElementType(Type)->getAs<RecordType>(); 4159 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 4160 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 4161 // C++03 [dcl.init]p9: 4162 // If no initializer is specified for an object, and the 4163 // object is of (possibly cv-qualified) non-POD class type (or 4164 // array thereof), the object shall be default-initialized; if 4165 // the object is of const-qualified type, the underlying class 4166 // type shall have a user-declared default 4167 // constructor. Otherwise, if no initializer is specified for 4168 // a non- static object, the object and its subobjects, if 4169 // any, have an indeterminate initial value); if the object 4170 // or any of its subobjects are of const-qualified type, the 4171 // program is ill-formed. 4172 // FIXME: DPG thinks it is very fishy that C++0x disables this. 4173 } else { 4174 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 4175 InitializationKind Kind 4176 = InitializationKind::CreateDefault(Var->getLocation()); 4177 4178 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 4179 OwningExprResult Init = InitSeq.Perform(*this, Entity, Kind, 4180 MultiExprArg(*this, 0, 0)); 4181 if (Init.isInvalid()) 4182 Var->setInvalidDecl(); 4183 else if (Init.get()) 4184 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 4185 } 4186 4187 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record) 4188 FinalizeVarWithDestructor(Var, Record); 4189 } 4190} 4191 4192Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 4193 DeclPtrTy *Group, 4194 unsigned NumDecls) { 4195 llvm::SmallVector<Decl*, 8> Decls; 4196 4197 if (DS.isTypeSpecOwned()) 4198 Decls.push_back((Decl*)DS.getTypeRep()); 4199 4200 for (unsigned i = 0; i != NumDecls; ++i) 4201 if (Decl *D = Group[i].getAs<Decl>()) 4202 Decls.push_back(D); 4203 4204 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 4205 Decls.data(), Decls.size())); 4206} 4207 4208 4209/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 4210/// to introduce parameters into function prototype scope. 4211Sema::DeclPtrTy 4212Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 4213 const DeclSpec &DS = D.getDeclSpec(); 4214 4215 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 4216 VarDecl::StorageClass StorageClass = VarDecl::None; 4217 VarDecl::StorageClass StorageClassAsWritten = VarDecl::None; 4218 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 4219 StorageClass = VarDecl::Register; 4220 StorageClassAsWritten = VarDecl::Register; 4221 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 4222 Diag(DS.getStorageClassSpecLoc(), 4223 diag::err_invalid_storage_class_in_func_decl); 4224 D.getMutableDeclSpec().ClearStorageClassSpecs(); 4225 } 4226 4227 if (D.getDeclSpec().isThreadSpecified()) 4228 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4229 4230 DiagnoseFunctionSpecifiers(D); 4231 4232 // Check that there are no default arguments inside the type of this 4233 // parameter (C++ only). 4234 if (getLangOptions().CPlusPlus) 4235 CheckExtraCXXDefaultArguments(D); 4236 4237 TypeSourceInfo *TInfo = 0; 4238 TagDecl *OwnedDecl = 0; 4239 QualType parmDeclType = GetTypeForDeclarator(D, S, &TInfo, &OwnedDecl); 4240 4241 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 4242 // C++ [dcl.fct]p6: 4243 // Types shall not be defined in return or parameter types. 4244 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 4245 << Context.getTypeDeclType(OwnedDecl); 4246 } 4247 4248 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 4249 IdentifierInfo *II = D.getIdentifier(); 4250 if (II) { 4251 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 4252 ForRedeclaration); 4253 LookupName(R, S); 4254 if (R.isSingleResult()) { 4255 NamedDecl *PrevDecl = R.getFoundDecl(); 4256 if (PrevDecl->isTemplateParameter()) { 4257 // Maybe we will complain about the shadowed template parameter. 4258 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4259 // Just pretend that we didn't see the previous declaration. 4260 PrevDecl = 0; 4261 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 4262 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 4263 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4264 4265 // Recover by removing the name 4266 II = 0; 4267 D.SetIdentifier(0, D.getIdentifierLoc()); 4268 D.setInvalidType(true); 4269 } 4270 } 4271 } 4272 4273 // Temporarily put parameter variables in the translation unit, not 4274 // the enclosing context. This prevents them from accidentally 4275 // looking like class members in C++. 4276 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 4277 TInfo, parmDeclType, II, 4278 D.getIdentifierLoc(), 4279 StorageClass, StorageClassAsWritten); 4280 4281 if (D.isInvalidType()) 4282 New->setInvalidDecl(); 4283 4284 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 4285 if (D.getCXXScopeSpec().isSet()) { 4286 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 4287 << D.getCXXScopeSpec().getRange(); 4288 New->setInvalidDecl(); 4289 } 4290 4291 // Add the parameter declaration into this scope. 4292 S->AddDecl(DeclPtrTy::make(New)); 4293 if (II) 4294 IdResolver.AddDecl(New); 4295 4296 ProcessDeclAttributes(S, New, D); 4297 4298 if (New->hasAttr<BlocksAttr>()) { 4299 Diag(New->getLocation(), diag::err_block_on_nonlocal); 4300 } 4301 return DeclPtrTy::make(New); 4302} 4303 4304ParmVarDecl *Sema::CheckParameter(DeclContext *DC, 4305 TypeSourceInfo *TSInfo, QualType T, 4306 IdentifierInfo *Name, 4307 SourceLocation NameLoc, 4308 VarDecl::StorageClass StorageClass, 4309 VarDecl::StorageClass StorageClassAsWritten) { 4310 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, NameLoc, Name, 4311 adjustParameterType(T), TSInfo, 4312 StorageClass, StorageClassAsWritten, 4313 0); 4314 4315 // Parameters can not be abstract class types. 4316 // For record types, this is done by the AbstractClassUsageDiagnoser once 4317 // the class has been completely parsed. 4318 if (!CurContext->isRecord() && 4319 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 4320 AbstractParamType)) 4321 New->setInvalidDecl(); 4322 4323 // Parameter declarators cannot be interface types. All ObjC objects are 4324 // passed by reference. 4325 if (T->isObjCInterfaceType()) { 4326 Diag(NameLoc, 4327 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 4328 New->setInvalidDecl(); 4329 } 4330 4331 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 4332 // duration shall not be qualified by an address-space qualifier." 4333 // Since all parameters have automatic store duration, they can not have 4334 // an address space. 4335 if (T.getAddressSpace() != 0) { 4336 Diag(NameLoc, diag::err_arg_with_address_space); 4337 New->setInvalidDecl(); 4338 } 4339 4340 return New; 4341} 4342 4343void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 4344 SourceLocation LocAfterDecls) { 4345 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4346 "Not a function declarator!"); 4347 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4348 4349 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 4350 // for a K&R function. 4351 if (!FTI.hasPrototype) { 4352 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 4353 --i; 4354 if (FTI.ArgInfo[i].Param == 0) { 4355 llvm::SmallString<256> Code; 4356 llvm::raw_svector_ostream(Code) << " int " 4357 << FTI.ArgInfo[i].Ident->getName() 4358 << ";\n"; 4359 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 4360 << FTI.ArgInfo[i].Ident 4361 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 4362 4363 // Implicitly declare the argument as type 'int' for lack of a better 4364 // type. 4365 DeclSpec DS; 4366 const char* PrevSpec; // unused 4367 unsigned DiagID; // unused 4368 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 4369 PrevSpec, DiagID); 4370 Declarator ParamD(DS, Declarator::KNRTypeListContext); 4371 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 4372 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 4373 } 4374 } 4375 } 4376} 4377 4378Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 4379 Declarator &D) { 4380 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 4381 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4382 "Not a function declarator!"); 4383 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4384 4385 if (FTI.hasPrototype) { 4386 // FIXME: Diagnose arguments without names in C. 4387 } 4388 4389 Scope *ParentScope = FnBodyScope->getParent(); 4390 4391 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 4392 MultiTemplateParamsArg(*this), 4393 /*IsFunctionDefinition=*/true); 4394 return ActOnStartOfFunctionDef(FnBodyScope, DP); 4395} 4396 4397static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 4398 // Don't warn about invalid declarations. 4399 if (FD->isInvalidDecl()) 4400 return false; 4401 4402 // Or declarations that aren't global. 4403 if (!FD->isGlobal()) 4404 return false; 4405 4406 // Don't warn about C++ member functions. 4407 if (isa<CXXMethodDecl>(FD)) 4408 return false; 4409 4410 // Don't warn about 'main'. 4411 if (FD->isMain()) 4412 return false; 4413 4414 // Don't warn about inline functions. 4415 if (FD->isInlineSpecified()) 4416 return false; 4417 4418 // Don't warn about function templates. 4419 if (FD->getDescribedFunctionTemplate()) 4420 return false; 4421 4422 // Don't warn about function template specializations. 4423 if (FD->isFunctionTemplateSpecialization()) 4424 return false; 4425 4426 bool MissingPrototype = true; 4427 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4428 Prev; Prev = Prev->getPreviousDeclaration()) { 4429 // Ignore any declarations that occur in function or method 4430 // scope, because they aren't visible from the header. 4431 if (Prev->getDeclContext()->isFunctionOrMethod()) 4432 continue; 4433 4434 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4435 break; 4436 } 4437 4438 return MissingPrototype; 4439} 4440 4441Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 4442 // Clear the last template instantiation error context. 4443 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4444 4445 if (!D) 4446 return D; 4447 FunctionDecl *FD = 0; 4448 4449 if (FunctionTemplateDecl *FunTmpl 4450 = dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>())) 4451 FD = FunTmpl->getTemplatedDecl(); 4452 else 4453 FD = cast<FunctionDecl>(D.getAs<Decl>()); 4454 4455 // Enter a new function scope 4456 PushFunctionScope(); 4457 4458 // See if this is a redefinition. 4459 // But don't complain if we're in GNU89 mode and the previous definition 4460 // was an extern inline function. 4461 const FunctionDecl *Definition; 4462 if (FD->getBody(Definition) && 4463 !canRedefineFunction(Definition, getLangOptions())) { 4464 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4465 Diag(Definition->getLocation(), diag::note_previous_definition); 4466 } 4467 4468 // Builtin functions cannot be defined. 4469 if (unsigned BuiltinID = FD->getBuiltinID()) { 4470 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4471 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4472 FD->setInvalidDecl(); 4473 } 4474 } 4475 4476 // The return type of a function definition must be complete 4477 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4478 QualType ResultType = FD->getResultType(); 4479 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4480 !FD->isInvalidDecl() && 4481 RequireCompleteType(FD->getLocation(), ResultType, 4482 diag::err_func_def_incomplete_result)) 4483 FD->setInvalidDecl(); 4484 4485 // GNU warning -Wmissing-prototypes: 4486 // Warn if a global function is defined without a previous 4487 // prototype declaration. This warning is issued even if the 4488 // definition itself provides a prototype. The aim is to detect 4489 // global functions that fail to be declared in header files. 4490 if (ShouldWarnAboutMissingPrototype(FD)) 4491 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4492 4493 if (FnBodyScope) 4494 PushDeclContext(FnBodyScope, FD); 4495 4496 // Check the validity of our function parameters 4497 CheckParmsForFunctionDef(FD); 4498 4499 bool ShouldCheckShadow = 4500 Diags.getDiagnosticLevel(diag::warn_decl_shadow) != Diagnostic::Ignored; 4501 4502 // Introduce our parameters into the function scope 4503 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4504 ParmVarDecl *Param = FD->getParamDecl(p); 4505 Param->setOwningFunction(FD); 4506 4507 // If this has an identifier, add it to the scope stack. 4508 if (Param->getIdentifier() && FnBodyScope) { 4509 if (ShouldCheckShadow) 4510 CheckShadow(FnBodyScope, Param); 4511 4512 PushOnScopeChains(Param, FnBodyScope); 4513 } 4514 } 4515 4516 // Checking attributes of current function definition 4517 // dllimport attribute. 4518 if (FD->getAttr<DLLImportAttr>() && 4519 (!FD->getAttr<DLLExportAttr>())) { 4520 // dllimport attribute cannot be applied to definition. 4521 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 4522 Diag(FD->getLocation(), 4523 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4524 << "dllimport"; 4525 FD->setInvalidDecl(); 4526 return DeclPtrTy::make(FD); 4527 } 4528 4529 // Visual C++ appears to not think this is an issue, so only issue 4530 // a warning when Microsoft extensions are disabled. 4531 if (!LangOpts.Microsoft) { 4532 // If a symbol previously declared dllimport is later defined, the 4533 // attribute is ignored in subsequent references, and a warning is 4534 // emitted. 4535 Diag(FD->getLocation(), 4536 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4537 << FD->getNameAsCString() << "dllimport"; 4538 } 4539 } 4540 return DeclPtrTy::make(FD); 4541} 4542 4543Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 4544 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4545} 4546 4547Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 4548 bool IsInstantiation) { 4549 Decl *dcl = D.getAs<Decl>(); 4550 Stmt *Body = BodyArg.takeAs<Stmt>(); 4551 4552 FunctionDecl *FD = 0; 4553 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4554 if (FunTmpl) 4555 FD = FunTmpl->getTemplatedDecl(); 4556 else 4557 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4558 4559 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 4560 4561 if (FD) { 4562 FD->setBody(Body); 4563 if (FD->isMain()) { 4564 // C and C++ allow for main to automagically return 0. 4565 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 4566 FD->setHasImplicitReturnZero(true); 4567 WP.disableCheckFallThrough(); 4568 } 4569 4570 if (!FD->isInvalidDecl()) 4571 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 4572 4573 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 4574 MaybeMarkVirtualMembersReferenced(Method->getLocation(), Method); 4575 4576 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 4577 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 4578 assert(MD == getCurMethodDecl() && "Method parsing confused"); 4579 MD->setBody(Body); 4580 MD->setEndLoc(Body->getLocEnd()); 4581 if (!MD->isInvalidDecl()) 4582 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 4583 } else { 4584 Body->Destroy(Context); 4585 return DeclPtrTy(); 4586 } 4587 4588 // Verify and clean out per-function state. 4589 4590 // Check goto/label use. 4591 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 4592 I = getLabelMap().begin(), E = getLabelMap().end(); I != E; ++I) { 4593 LabelStmt *L = I->second; 4594 4595 // Verify that we have no forward references left. If so, there was a goto 4596 // or address of a label taken, but no definition of it. Label fwd 4597 // definitions are indicated with a null substmt. 4598 if (L->getSubStmt() != 0) 4599 continue; 4600 4601 // Emit error. 4602 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 4603 4604 // At this point, we have gotos that use the bogus label. Stitch it into 4605 // the function body so that they aren't leaked and that the AST is well 4606 // formed. 4607 if (Body == 0) { 4608 // The whole function wasn't parsed correctly, just delete this. 4609 L->Destroy(Context); 4610 continue; 4611 } 4612 4613 // Otherwise, the body is valid: we want to stitch the label decl into the 4614 // function somewhere so that it is properly owned and so that the goto 4615 // has a valid target. Do this by creating a new compound stmt with the 4616 // label in it. 4617 4618 // Give the label a sub-statement. 4619 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 4620 4621 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 4622 cast<CXXTryStmt>(Body)->getTryBlock() : 4623 cast<CompoundStmt>(Body); 4624 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(), 4625 Compound->body_end()); 4626 Elements.push_back(L); 4627 Compound->setStmts(Context, Elements.data(), Elements.size()); 4628 } 4629 4630 if (Body) { 4631 // C++ constructors that have function-try-blocks can't have return 4632 // statements in the handlers of that block. (C++ [except.handle]p14) 4633 // Verify this. 4634 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 4635 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 4636 4637 // Verify that that gotos and switch cases don't jump into scopes illegally. 4638 // Verify that that gotos and switch cases don't jump into scopes illegally. 4639 if (FunctionNeedsScopeChecking() && !hasAnyErrorsInThisFunction()) 4640 DiagnoseInvalidJumps(Body); 4641 4642 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 4643 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4644 Destructor->getParent()); 4645 4646 // If any errors have occurred, clear out any temporaries that may have 4647 // been leftover. This ensures that these temporaries won't be picked up for 4648 // deletion in some later function. 4649 if (PP.getDiagnostics().hasErrorOccurred()) 4650 ExprTemporaries.clear(); 4651 else if (!isa<FunctionTemplateDecl>(dcl)) { 4652 // Since the body is valid, issue any analysis-based warnings that are 4653 // enabled. 4654 QualType ResultType; 4655 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 4656 ResultType = FD->getResultType(); 4657 } 4658 else { 4659 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl); 4660 ResultType = MD->getResultType(); 4661 } 4662 AnalysisWarnings.IssueWarnings(WP, dcl); 4663 } 4664 4665 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 4666 } 4667 4668 if (!IsInstantiation) 4669 PopDeclContext(); 4670 4671 PopFunctionOrBlockScope(); 4672 4673 // If any errors have occurred, clear out any temporaries that may have 4674 // been leftover. This ensures that these temporaries won't be picked up for 4675 // deletion in some later function. 4676 if (getDiagnostics().hasErrorOccurred()) 4677 ExprTemporaries.clear(); 4678 4679 return D; 4680} 4681 4682/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 4683/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 4684NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 4685 IdentifierInfo &II, Scope *S) { 4686 // Before we produce a declaration for an implicitly defined 4687 // function, see whether there was a locally-scoped declaration of 4688 // this name as a function or variable. If so, use that 4689 // (non-visible) declaration, and complain about it. 4690 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4691 = LocallyScopedExternalDecls.find(&II); 4692 if (Pos != LocallyScopedExternalDecls.end()) { 4693 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 4694 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 4695 return Pos->second; 4696 } 4697 4698 // Extension in C99. Legal in C90, but warn about it. 4699 if (II.getName().startswith("__builtin_")) 4700 Diag(Loc, diag::warn_builtin_unknown) << &II; 4701 else if (getLangOptions().C99) 4702 Diag(Loc, diag::ext_implicit_function_decl) << &II; 4703 else 4704 Diag(Loc, diag::warn_implicit_function_decl) << &II; 4705 4706 // Set a Declarator for the implicit definition: int foo(); 4707 const char *Dummy; 4708 DeclSpec DS; 4709 unsigned DiagID; 4710 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 4711 Error = Error; // Silence warning. 4712 assert(!Error && "Error setting up implicit decl!"); 4713 Declarator D(DS, Declarator::BlockContext); 4714 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 4715 0, 0, false, SourceLocation(), 4716 false, 0,0,0, Loc, Loc, D), 4717 SourceLocation()); 4718 D.SetIdentifier(&II, Loc); 4719 4720 // Insert this function into translation-unit scope. 4721 4722 DeclContext *PrevDC = CurContext; 4723 CurContext = Context.getTranslationUnitDecl(); 4724 4725 FunctionDecl *FD = 4726 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 4727 FD->setImplicit(); 4728 4729 CurContext = PrevDC; 4730 4731 AddKnownFunctionAttributes(FD); 4732 4733 return FD; 4734} 4735 4736/// \brief Adds any function attributes that we know a priori based on 4737/// the declaration of this function. 4738/// 4739/// These attributes can apply both to implicitly-declared builtins 4740/// (like __builtin___printf_chk) or to library-declared functions 4741/// like NSLog or printf. 4742void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 4743 if (FD->isInvalidDecl()) 4744 return; 4745 4746 // If this is a built-in function, map its builtin attributes to 4747 // actual attributes. 4748 if (unsigned BuiltinID = FD->getBuiltinID()) { 4749 // Handle printf-formatting attributes. 4750 unsigned FormatIdx; 4751 bool HasVAListArg; 4752 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 4753 if (!FD->getAttr<FormatAttr>()) 4754 FD->addAttr(::new (Context) FormatAttr(Context, "printf", FormatIdx+1, 4755 HasVAListArg ? 0 : FormatIdx+2)); 4756 } 4757 4758 // Mark const if we don't care about errno and that is the only 4759 // thing preventing the function from being const. This allows 4760 // IRgen to use LLVM intrinsics for such functions. 4761 if (!getLangOptions().MathErrno && 4762 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 4763 if (!FD->getAttr<ConstAttr>()) 4764 FD->addAttr(::new (Context) ConstAttr()); 4765 } 4766 4767 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 4768 FD->setType(Context.getNoReturnType(FD->getType())); 4769 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 4770 FD->addAttr(::new (Context) NoThrowAttr()); 4771 if (Context.BuiltinInfo.isConst(BuiltinID)) 4772 FD->addAttr(::new (Context) ConstAttr()); 4773 } 4774 4775 IdentifierInfo *Name = FD->getIdentifier(); 4776 if (!Name) 4777 return; 4778 if ((!getLangOptions().CPlusPlus && 4779 FD->getDeclContext()->isTranslationUnit()) || 4780 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 4781 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 4782 LinkageSpecDecl::lang_c)) { 4783 // Okay: this could be a libc/libm/Objective-C function we know 4784 // about. 4785 } else 4786 return; 4787 4788 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 4789 // FIXME: NSLog and NSLogv should be target specific 4790 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 4791 // FIXME: We known better than our headers. 4792 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 4793 } else 4794 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 1, 4795 Name->isStr("NSLogv") ? 0 : 2)); 4796 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 4797 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 4798 // target-specific builtins, perhaps? 4799 if (!FD->getAttr<FormatAttr>()) 4800 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 2, 4801 Name->isStr("vasprintf") ? 0 : 3)); 4802 } 4803} 4804 4805TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 4806 TypeSourceInfo *TInfo) { 4807 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 4808 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 4809 4810 if (!TInfo) { 4811 assert(D.isInvalidType() && "no declarator info for valid type"); 4812 TInfo = Context.getTrivialTypeSourceInfo(T); 4813 } 4814 4815 // Scope manipulation handled by caller. 4816 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 4817 D.getIdentifierLoc(), 4818 D.getIdentifier(), 4819 TInfo); 4820 4821 if (const TagType *TT = T->getAs<TagType>()) { 4822 TagDecl *TD = TT->getDecl(); 4823 4824 // If the TagDecl that the TypedefDecl points to is an anonymous decl 4825 // keep track of the TypedefDecl. 4826 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 4827 TD->setTypedefForAnonDecl(NewTD); 4828 } 4829 4830 if (D.isInvalidType()) 4831 NewTD->setInvalidDecl(); 4832 return NewTD; 4833} 4834 4835 4836/// \brief Determine whether a tag with a given kind is acceptable 4837/// as a redeclaration of the given tag declaration. 4838/// 4839/// \returns true if the new tag kind is acceptable, false otherwise. 4840bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 4841 TagDecl::TagKind NewTag, 4842 SourceLocation NewTagLoc, 4843 const IdentifierInfo &Name) { 4844 // C++ [dcl.type.elab]p3: 4845 // The class-key or enum keyword present in the 4846 // elaborated-type-specifier shall agree in kind with the 4847 // declaration to which the name in theelaborated-type-specifier 4848 // refers. This rule also applies to the form of 4849 // elaborated-type-specifier that declares a class-name or 4850 // friend class since it can be construed as referring to the 4851 // definition of the class. Thus, in any 4852 // elaborated-type-specifier, the enum keyword shall be used to 4853 // refer to an enumeration (7.2), the union class-keyshall be 4854 // used to refer to a union (clause 9), and either the class or 4855 // struct class-key shall be used to refer to a class (clause 9) 4856 // declared using the class or struct class-key. 4857 TagDecl::TagKind OldTag = Previous->getTagKind(); 4858 if (OldTag == NewTag) 4859 return true; 4860 4861 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 4862 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 4863 // Warn about the struct/class tag mismatch. 4864 bool isTemplate = false; 4865 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 4866 isTemplate = Record->getDescribedClassTemplate(); 4867 4868 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 4869 << (NewTag == TagDecl::TK_class) 4870 << isTemplate << &Name 4871 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 4872 OldTag == TagDecl::TK_class? "class" : "struct"); 4873 Diag(Previous->getLocation(), diag::note_previous_use); 4874 return true; 4875 } 4876 return false; 4877} 4878 4879/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 4880/// former case, Name will be non-null. In the later case, Name will be null. 4881/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 4882/// reference/declaration/definition of a tag. 4883Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 4884 SourceLocation KWLoc, CXXScopeSpec &SS, 4885 IdentifierInfo *Name, SourceLocation NameLoc, 4886 AttributeList *Attr, AccessSpecifier AS, 4887 MultiTemplateParamsArg TemplateParameterLists, 4888 bool &OwnedDecl, bool &IsDependent) { 4889 // If this is not a definition, it must have a name. 4890 assert((Name != 0 || TUK == TUK_Definition) && 4891 "Nameless record must be a definition!"); 4892 4893 OwnedDecl = false; 4894 TagDecl::TagKind Kind = TagDecl::getTagKindForTypeSpec(TagSpec); 4895 4896 // FIXME: Check explicit specializations more carefully. 4897 bool isExplicitSpecialization = false; 4898 if (TUK != TUK_Reference) { 4899 if (TemplateParameterList *TemplateParams 4900 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 4901 (TemplateParameterList**)TemplateParameterLists.get(), 4902 TemplateParameterLists.size(), 4903 TUK == TUK_Friend, 4904 isExplicitSpecialization)) { 4905 if (TemplateParams->size() > 0) { 4906 // This is a declaration or definition of a class template (which may 4907 // be a member of another template). 4908 OwnedDecl = false; 4909 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 4910 SS, Name, NameLoc, Attr, 4911 TemplateParams, 4912 AS); 4913 TemplateParameterLists.release(); 4914 return Result.get(); 4915 } else { 4916 // The "template<>" header is extraneous. 4917 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 4918 << ElaboratedType::getNameForTagKind(Kind) << Name; 4919 isExplicitSpecialization = true; 4920 } 4921 } 4922 4923 TemplateParameterLists.release(); 4924 } 4925 4926 DeclContext *SearchDC = CurContext; 4927 DeclContext *DC = CurContext; 4928 bool isStdBadAlloc = false; 4929 bool Invalid = false; 4930 4931 RedeclarationKind Redecl = ForRedeclaration; 4932 if (TUK == TUK_Friend || TUK == TUK_Reference) 4933 Redecl = NotForRedeclaration; 4934 4935 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 4936 4937 if (Name && SS.isNotEmpty()) { 4938 // We have a nested-name tag ('struct foo::bar'). 4939 4940 // Check for invalid 'foo::'. 4941 if (SS.isInvalid()) { 4942 Name = 0; 4943 goto CreateNewDecl; 4944 } 4945 4946 // If this is a friend or a reference to a class in a dependent 4947 // context, don't try to make a decl for it. 4948 if (TUK == TUK_Friend || TUK == TUK_Reference) { 4949 DC = computeDeclContext(SS, false); 4950 if (!DC) { 4951 IsDependent = true; 4952 return DeclPtrTy(); 4953 } 4954 } else { 4955 DC = computeDeclContext(SS, true); 4956 if (!DC) { 4957 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 4958 << SS.getRange(); 4959 return DeclPtrTy(); 4960 } 4961 } 4962 4963 if (RequireCompleteDeclContext(SS, DC)) 4964 return DeclPtrTy::make((Decl *)0); 4965 4966 SearchDC = DC; 4967 // Look-up name inside 'foo::'. 4968 LookupQualifiedName(Previous, DC); 4969 4970 if (Previous.isAmbiguous()) 4971 return DeclPtrTy(); 4972 4973 if (Previous.empty()) { 4974 // Name lookup did not find anything. However, if the 4975 // nested-name-specifier refers to the current instantiation, 4976 // and that current instantiation has any dependent base 4977 // classes, we might find something at instantiation time: treat 4978 // this as a dependent elaborated-type-specifier. 4979 if (Previous.wasNotFoundInCurrentInstantiation()) { 4980 IsDependent = true; 4981 return DeclPtrTy(); 4982 } 4983 4984 // A tag 'foo::bar' must already exist. 4985 Diag(NameLoc, diag::err_not_tag_in_scope) 4986 << Kind << Name << DC << SS.getRange(); 4987 Name = 0; 4988 Invalid = true; 4989 goto CreateNewDecl; 4990 } 4991 } else if (Name) { 4992 // If this is a named struct, check to see if there was a previous forward 4993 // declaration or definition. 4994 // FIXME: We're looking into outer scopes here, even when we 4995 // shouldn't be. Doing so can result in ambiguities that we 4996 // shouldn't be diagnosing. 4997 LookupName(Previous, S); 4998 4999 // Note: there used to be some attempt at recovery here. 5000 if (Previous.isAmbiguous()) 5001 return DeclPtrTy(); 5002 5003 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 5004 // FIXME: This makes sure that we ignore the contexts associated 5005 // with C structs, unions, and enums when looking for a matching 5006 // tag declaration or definition. See the similar lookup tweak 5007 // in Sema::LookupName; is there a better way to deal with this? 5008 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 5009 SearchDC = SearchDC->getParent(); 5010 } 5011 } 5012 5013 if (Previous.isSingleResult() && 5014 Previous.getFoundDecl()->isTemplateParameter()) { 5015 // Maybe we will complain about the shadowed template parameter. 5016 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 5017 // Just pretend that we didn't see the previous declaration. 5018 Previous.clear(); 5019 } 5020 5021 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 5022 DC->Equals(StdNamespace) && Name->isStr("bad_alloc")) { 5023 // This is a declaration of or a reference to "std::bad_alloc". 5024 isStdBadAlloc = true; 5025 5026 if (Previous.empty() && StdBadAlloc) { 5027 // std::bad_alloc has been implicitly declared (but made invisible to 5028 // name lookup). Fill in this implicit declaration as the previous 5029 // declaration, so that the declarations get chained appropriately. 5030 Previous.addDecl(StdBadAlloc); 5031 } 5032 } 5033 5034 // If we didn't find a previous declaration, and this is a reference 5035 // (or friend reference), move to the correct scope. In C++, we 5036 // also need to do a redeclaration lookup there, just in case 5037 // there's a shadow friend decl. 5038 if (Name && Previous.empty() && 5039 (TUK == TUK_Reference || TUK == TUK_Friend)) { 5040 if (Invalid) goto CreateNewDecl; 5041 assert(SS.isEmpty()); 5042 5043 if (TUK == TUK_Reference) { 5044 // C++ [basic.scope.pdecl]p5: 5045 // -- for an elaborated-type-specifier of the form 5046 // 5047 // class-key identifier 5048 // 5049 // if the elaborated-type-specifier is used in the 5050 // decl-specifier-seq or parameter-declaration-clause of a 5051 // function defined in namespace scope, the identifier is 5052 // declared as a class-name in the namespace that contains 5053 // the declaration; otherwise, except as a friend 5054 // declaration, the identifier is declared in the smallest 5055 // non-class, non-function-prototype scope that contains the 5056 // declaration. 5057 // 5058 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 5059 // C structs and unions. 5060 // 5061 // It is an error in C++ to declare (rather than define) an enum 5062 // type, including via an elaborated type specifier. We'll 5063 // diagnose that later; for now, declare the enum in the same 5064 // scope as we would have picked for any other tag type. 5065 // 5066 // GNU C also supports this behavior as part of its incomplete 5067 // enum types extension, while GNU C++ does not. 5068 // 5069 // Find the context where we'll be declaring the tag. 5070 // FIXME: We would like to maintain the current DeclContext as the 5071 // lexical context, 5072 while (SearchDC->isRecord()) 5073 SearchDC = SearchDC->getParent(); 5074 5075 // Find the scope where we'll be declaring the tag. 5076 while (S->isClassScope() || 5077 (getLangOptions().CPlusPlus && 5078 S->isFunctionPrototypeScope()) || 5079 ((S->getFlags() & Scope::DeclScope) == 0) || 5080 (S->getEntity() && 5081 ((DeclContext *)S->getEntity())->isTransparentContext())) 5082 S = S->getParent(); 5083 } else { 5084 assert(TUK == TUK_Friend); 5085 // C++ [namespace.memdef]p3: 5086 // If a friend declaration in a non-local class first declares a 5087 // class or function, the friend class or function is a member of 5088 // the innermost enclosing namespace. 5089 SearchDC = SearchDC->getEnclosingNamespaceContext(); 5090 } 5091 5092 // In C++, we need to do a redeclaration lookup to properly 5093 // diagnose some problems. 5094 if (getLangOptions().CPlusPlus) { 5095 Previous.setRedeclarationKind(ForRedeclaration); 5096 LookupQualifiedName(Previous, SearchDC); 5097 } 5098 } 5099 5100 if (!Previous.empty()) { 5101 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 5102 5103 // It's okay to have a tag decl in the same scope as a typedef 5104 // which hides a tag decl in the same scope. Finding this 5105 // insanity with a redeclaration lookup can only actually happen 5106 // in C++. 5107 // 5108 // This is also okay for elaborated-type-specifiers, which is 5109 // technically forbidden by the current standard but which is 5110 // okay according to the likely resolution of an open issue; 5111 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 5112 if (getLangOptions().CPlusPlus) { 5113 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(PrevDecl)) { 5114 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 5115 TagDecl *Tag = TT->getDecl(); 5116 if (Tag->getDeclName() == Name && 5117 Tag->getDeclContext()->getLookupContext() 5118 ->Equals(TD->getDeclContext()->getLookupContext())) { 5119 PrevDecl = Tag; 5120 Previous.clear(); 5121 Previous.addDecl(Tag); 5122 } 5123 } 5124 } 5125 } 5126 5127 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 5128 // If this is a use of a previous tag, or if the tag is already declared 5129 // in the same scope (so that the definition/declaration completes or 5130 // rementions the tag), reuse the decl. 5131 if (TUK == TUK_Reference || TUK == TUK_Friend || 5132 isDeclInScope(PrevDecl, SearchDC, S)) { 5133 // Make sure that this wasn't declared as an enum and now used as a 5134 // struct or something similar. 5135 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 5136 bool SafeToContinue 5137 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 5138 Kind != TagDecl::TK_enum); 5139 if (SafeToContinue) 5140 Diag(KWLoc, diag::err_use_with_wrong_tag) 5141 << Name 5142 << FixItHint::CreateReplacement(SourceRange(KWLoc), 5143 PrevTagDecl->getKindName()); 5144 else 5145 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 5146 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 5147 5148 if (SafeToContinue) 5149 Kind = PrevTagDecl->getTagKind(); 5150 else { 5151 // Recover by making this an anonymous redefinition. 5152 Name = 0; 5153 Previous.clear(); 5154 Invalid = true; 5155 } 5156 } 5157 5158 if (!Invalid) { 5159 // If this is a use, just return the declaration we found. 5160 5161 // FIXME: In the future, return a variant or some other clue 5162 // for the consumer of this Decl to know it doesn't own it. 5163 // For our current ASTs this shouldn't be a problem, but will 5164 // need to be changed with DeclGroups. 5165 if (TUK == TUK_Reference || TUK == TUK_Friend) 5166 return DeclPtrTy::make(PrevTagDecl); 5167 5168 // Diagnose attempts to redefine a tag. 5169 if (TUK == TUK_Definition) { 5170 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 5171 // If we're defining a specialization and the previous definition 5172 // is from an implicit instantiation, don't emit an error 5173 // here; we'll catch this in the general case below. 5174 if (!isExplicitSpecialization || 5175 !isa<CXXRecordDecl>(Def) || 5176 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 5177 == TSK_ExplicitSpecialization) { 5178 Diag(NameLoc, diag::err_redefinition) << Name; 5179 Diag(Def->getLocation(), diag::note_previous_definition); 5180 // If this is a redefinition, recover by making this 5181 // struct be anonymous, which will make any later 5182 // references get the previous definition. 5183 Name = 0; 5184 Previous.clear(); 5185 Invalid = true; 5186 } 5187 } else { 5188 // If the type is currently being defined, complain 5189 // about a nested redefinition. 5190 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 5191 if (Tag->isBeingDefined()) { 5192 Diag(NameLoc, diag::err_nested_redefinition) << Name; 5193 Diag(PrevTagDecl->getLocation(), 5194 diag::note_previous_definition); 5195 Name = 0; 5196 Previous.clear(); 5197 Invalid = true; 5198 } 5199 } 5200 5201 // Okay, this is definition of a previously declared or referenced 5202 // tag PrevDecl. We're going to create a new Decl for it. 5203 } 5204 } 5205 // If we get here we have (another) forward declaration or we 5206 // have a definition. Just create a new decl. 5207 5208 } else { 5209 // If we get here, this is a definition of a new tag type in a nested 5210 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 5211 // new decl/type. We set PrevDecl to NULL so that the entities 5212 // have distinct types. 5213 Previous.clear(); 5214 } 5215 // If we get here, we're going to create a new Decl. If PrevDecl 5216 // is non-NULL, it's a definition of the tag declared by 5217 // PrevDecl. If it's NULL, we have a new definition. 5218 5219 5220 // Otherwise, PrevDecl is not a tag, but was found with tag 5221 // lookup. This is only actually possible in C++, where a few 5222 // things like templates still live in the tag namespace. 5223 } else { 5224 assert(getLangOptions().CPlusPlus); 5225 5226 // Use a better diagnostic if an elaborated-type-specifier 5227 // found the wrong kind of type on the first 5228 // (non-redeclaration) lookup. 5229 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 5230 !Previous.isForRedeclaration()) { 5231 unsigned Kind = 0; 5232 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5233 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5234 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 5235 Diag(PrevDecl->getLocation(), diag::note_declared_at); 5236 Invalid = true; 5237 5238 // Otherwise, only diagnose if the declaration is in scope. 5239 } else if (!isDeclInScope(PrevDecl, SearchDC, S)) { 5240 // do nothing 5241 5242 // Diagnose implicit declarations introduced by elaborated types. 5243 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 5244 unsigned Kind = 0; 5245 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5246 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5247 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 5248 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5249 Invalid = true; 5250 5251 // Otherwise it's a declaration. Call out a particularly common 5252 // case here. 5253 } else if (isa<TypedefDecl>(PrevDecl)) { 5254 Diag(NameLoc, diag::err_tag_definition_of_typedef) 5255 << Name 5256 << cast<TypedefDecl>(PrevDecl)->getUnderlyingType(); 5257 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5258 Invalid = true; 5259 5260 // Otherwise, diagnose. 5261 } else { 5262 // The tag name clashes with something else in the target scope, 5263 // issue an error and recover by making this tag be anonymous. 5264 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 5265 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5266 Name = 0; 5267 Invalid = true; 5268 } 5269 5270 // The existing declaration isn't relevant to us; we're in a 5271 // new scope, so clear out the previous declaration. 5272 Previous.clear(); 5273 } 5274 } 5275 5276CreateNewDecl: 5277 5278 TagDecl *PrevDecl = 0; 5279 if (Previous.isSingleResult()) 5280 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 5281 5282 // If there is an identifier, use the location of the identifier as the 5283 // location of the decl, otherwise use the location of the struct/union 5284 // keyword. 5285 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 5286 5287 // Otherwise, create a new declaration. If there is a previous 5288 // declaration of the same entity, the two will be linked via 5289 // PrevDecl. 5290 TagDecl *New; 5291 5292 if (Kind == TagDecl::TK_enum) { 5293 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5294 // enum X { A, B, C } D; D should chain to X. 5295 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 5296 cast_or_null<EnumDecl>(PrevDecl)); 5297 // If this is an undefined enum, warn. 5298 if (TUK != TUK_Definition && !Invalid) { 5299 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 5300 : diag::ext_forward_ref_enum; 5301 Diag(Loc, DK); 5302 } 5303 } else { 5304 // struct/union/class 5305 5306 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5307 // struct X { int A; } D; D should chain to X. 5308 if (getLangOptions().CPlusPlus) { 5309 // FIXME: Look for a way to use RecordDecl for simple structs. 5310 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5311 cast_or_null<CXXRecordDecl>(PrevDecl)); 5312 5313 if (isStdBadAlloc && (!StdBadAlloc || StdBadAlloc->isImplicit())) 5314 StdBadAlloc = cast<CXXRecordDecl>(New); 5315 } else 5316 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5317 cast_or_null<RecordDecl>(PrevDecl)); 5318 } 5319 5320 // Maybe add qualifier info. 5321 if (SS.isNotEmpty()) { 5322 NestedNameSpecifier *NNS 5323 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5324 New->setQualifierInfo(NNS, SS.getRange()); 5325 } 5326 5327 if (Kind != TagDecl::TK_enum) { 5328 // Handle #pragma pack: if the #pragma pack stack has non-default 5329 // alignment, make up a packed attribute for this decl. These 5330 // attributes are checked when the ASTContext lays out the 5331 // structure. 5332 // 5333 // It is important for implementing the correct semantics that this 5334 // happen here (in act on tag decl). The #pragma pack stack is 5335 // maintained as a result of parser callbacks which can occur at 5336 // many points during the parsing of a struct declaration (because 5337 // the #pragma tokens are effectively skipped over during the 5338 // parsing of the struct). 5339 if (unsigned Alignment = getPragmaPackAlignment()) 5340 New->addAttr(::new (Context) PragmaPackAttr(Alignment * 8)); 5341 } 5342 5343 // If this is a specialization of a member class (of a class template), 5344 // check the specialization. 5345 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 5346 Invalid = true; 5347 5348 if (Invalid) 5349 New->setInvalidDecl(); 5350 5351 if (Attr) 5352 ProcessDeclAttributeList(S, New, Attr); 5353 5354 // If we're declaring or defining a tag in function prototype scope 5355 // in C, note that this type can only be used within the function. 5356 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 5357 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 5358 5359 // Set the lexical context. If the tag has a C++ scope specifier, the 5360 // lexical context will be different from the semantic context. 5361 New->setLexicalDeclContext(CurContext); 5362 5363 // Mark this as a friend decl if applicable. 5364 if (TUK == TUK_Friend) 5365 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 5366 5367 // Set the access specifier. 5368 if (!Invalid && SearchDC->isRecord()) 5369 SetMemberAccessSpecifier(New, PrevDecl, AS); 5370 5371 if (TUK == TUK_Definition) 5372 New->startDefinition(); 5373 5374 // If this has an identifier, add it to the scope stack. 5375 if (TUK == TUK_Friend) { 5376 // We might be replacing an existing declaration in the lookup tables; 5377 // if so, borrow its access specifier. 5378 if (PrevDecl) 5379 New->setAccess(PrevDecl->getAccess()); 5380 5381 DeclContext *DC = New->getDeclContext()->getLookupContext(); 5382 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 5383 if (Name) // can be null along some error paths 5384 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5385 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 5386 } else if (Name) { 5387 S = getNonFieldDeclScope(S); 5388 PushOnScopeChains(New, S); 5389 } else { 5390 CurContext->addDecl(New); 5391 } 5392 5393 // If this is the C FILE type, notify the AST context. 5394 if (IdentifierInfo *II = New->getIdentifier()) 5395 if (!New->isInvalidDecl() && 5396 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 5397 II->isStr("FILE")) 5398 Context.setFILEDecl(New); 5399 5400 OwnedDecl = true; 5401 return DeclPtrTy::make(New); 5402} 5403 5404void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 5405 AdjustDeclIfTemplate(TagD); 5406 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5407 5408 // Enter the tag context. 5409 PushDeclContext(S, Tag); 5410} 5411 5412void Sema::ActOnStartCXXMemberDeclarations(Scope *S, DeclPtrTy TagD, 5413 SourceLocation LBraceLoc) { 5414 AdjustDeclIfTemplate(TagD); 5415 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD.getAs<Decl>()); 5416 5417 FieldCollector->StartClass(); 5418 5419 if (!Record->getIdentifier()) 5420 return; 5421 5422 // C++ [class]p2: 5423 // [...] The class-name is also inserted into the scope of the 5424 // class itself; this is known as the injected-class-name. For 5425 // purposes of access checking, the injected-class-name is treated 5426 // as if it were a public member name. 5427 CXXRecordDecl *InjectedClassName 5428 = CXXRecordDecl::Create(Context, Record->getTagKind(), 5429 CurContext, Record->getLocation(), 5430 Record->getIdentifier(), 5431 Record->getTagKeywordLoc(), 5432 Record); 5433 InjectedClassName->setImplicit(); 5434 InjectedClassName->setAccess(AS_public); 5435 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 5436 InjectedClassName->setDescribedClassTemplate(Template); 5437 PushOnScopeChains(InjectedClassName, S); 5438 assert(InjectedClassName->isInjectedClassName() && 5439 "Broken injected-class-name"); 5440} 5441 5442// Traverses the class and any nested classes, making a note of any 5443// dynamic classes that have no key function so that we can mark all of 5444// their virtual member functions as "used" at the end of the translation 5445// unit. This ensures that all functions needed by the vtable will get 5446// instantiated/synthesized. 5447static void 5448RecordDynamicClassesWithNoKeyFunction(Sema &S, CXXRecordDecl *Record, 5449 SourceLocation Loc) { 5450 // We don't look at dependent or undefined classes. 5451 if (Record->isDependentContext() || !Record->isDefinition()) 5452 return; 5453 5454 if (Record->isDynamicClass()) { 5455 const CXXMethodDecl *KeyFunction = S.Context.getKeyFunction(Record); 5456 5457 if (!KeyFunction) 5458 S.ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(Record, 5459 Loc)); 5460 5461 if ((!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 5462 && Record->getLinkage() == ExternalLinkage) 5463 S.Diag(Record->getLocation(), diag::warn_weak_vtable) << Record; 5464 } 5465 for (DeclContext::decl_iterator D = Record->decls_begin(), 5466 DEnd = Record->decls_end(); 5467 D != DEnd; ++D) { 5468 if (CXXRecordDecl *Nested = dyn_cast<CXXRecordDecl>(*D)) 5469 RecordDynamicClassesWithNoKeyFunction(S, Nested, Loc); 5470 } 5471} 5472 5473void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 5474 SourceLocation RBraceLoc) { 5475 AdjustDeclIfTemplate(TagD); 5476 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5477 Tag->setRBraceLoc(RBraceLoc); 5478 5479 if (isa<CXXRecordDecl>(Tag)) 5480 FieldCollector->FinishClass(); 5481 5482 // Exit this scope of this tag's definition. 5483 PopDeclContext(); 5484 5485 if (isa<CXXRecordDecl>(Tag) && !Tag->getLexicalDeclContext()->isRecord()) 5486 RecordDynamicClassesWithNoKeyFunction(*this, cast<CXXRecordDecl>(Tag), 5487 RBraceLoc); 5488 5489 // Notify the consumer that we've defined a tag. 5490 Consumer.HandleTagDeclDefinition(Tag); 5491} 5492 5493void Sema::ActOnTagDefinitionError(Scope *S, DeclPtrTy TagD) { 5494 AdjustDeclIfTemplate(TagD); 5495 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5496 Tag->setInvalidDecl(); 5497 5498 // We're undoing ActOnTagStartDefinition here, not 5499 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 5500 // the FieldCollector. 5501 5502 PopDeclContext(); 5503} 5504 5505// Note that FieldName may be null for anonymous bitfields. 5506bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 5507 QualType FieldTy, const Expr *BitWidth, 5508 bool *ZeroWidth) { 5509 // Default to true; that shouldn't confuse checks for emptiness 5510 if (ZeroWidth) 5511 *ZeroWidth = true; 5512 5513 // C99 6.7.2.1p4 - verify the field type. 5514 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 5515 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 5516 // Handle incomplete types with specific error. 5517 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 5518 return true; 5519 if (FieldName) 5520 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 5521 << FieldName << FieldTy << BitWidth->getSourceRange(); 5522 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 5523 << FieldTy << BitWidth->getSourceRange(); 5524 } 5525 5526 // If the bit-width is type- or value-dependent, don't try to check 5527 // it now. 5528 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 5529 return false; 5530 5531 llvm::APSInt Value; 5532 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 5533 return true; 5534 5535 if (Value != 0 && ZeroWidth) 5536 *ZeroWidth = false; 5537 5538 // Zero-width bitfield is ok for anonymous field. 5539 if (Value == 0 && FieldName) 5540 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 5541 5542 if (Value.isSigned() && Value.isNegative()) { 5543 if (FieldName) 5544 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 5545 << FieldName << Value.toString(10); 5546 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 5547 << Value.toString(10); 5548 } 5549 5550 if (!FieldTy->isDependentType()) { 5551 uint64_t TypeSize = Context.getTypeSize(FieldTy); 5552 if (Value.getZExtValue() > TypeSize) { 5553 if (!getLangOptions().CPlusPlus) { 5554 if (FieldName) 5555 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 5556 << FieldName << (unsigned)Value.getZExtValue() 5557 << (unsigned)TypeSize; 5558 5559 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 5560 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 5561 } 5562 5563 if (FieldName) 5564 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 5565 << FieldName << (unsigned)Value.getZExtValue() 5566 << (unsigned)TypeSize; 5567 else 5568 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 5569 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 5570 } 5571 } 5572 5573 return false; 5574} 5575 5576/// ActOnField - Each field of a struct/union/class is passed into this in order 5577/// to create a FieldDecl object for it. 5578Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 5579 SourceLocation DeclStart, 5580 Declarator &D, ExprTy *BitfieldWidth) { 5581 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 5582 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 5583 AS_public); 5584 return DeclPtrTy::make(Res); 5585} 5586 5587/// HandleField - Analyze a field of a C struct or a C++ data member. 5588/// 5589FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 5590 SourceLocation DeclStart, 5591 Declarator &D, Expr *BitWidth, 5592 AccessSpecifier AS) { 5593 IdentifierInfo *II = D.getIdentifier(); 5594 SourceLocation Loc = DeclStart; 5595 if (II) Loc = D.getIdentifierLoc(); 5596 5597 TypeSourceInfo *TInfo = 0; 5598 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5599 if (getLangOptions().CPlusPlus) 5600 CheckExtraCXXDefaultArguments(D); 5601 5602 DiagnoseFunctionSpecifiers(D); 5603 5604 if (D.getDeclSpec().isThreadSpecified()) 5605 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5606 5607 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 5608 ForRedeclaration); 5609 5610 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5611 // Maybe we will complain about the shadowed template parameter. 5612 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5613 // Just pretend that we didn't see the previous declaration. 5614 PrevDecl = 0; 5615 } 5616 5617 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 5618 PrevDecl = 0; 5619 5620 bool Mutable 5621 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 5622 SourceLocation TSSL = D.getSourceRange().getBegin(); 5623 FieldDecl *NewFD 5624 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 5625 AS, PrevDecl, &D); 5626 5627 if (NewFD->isInvalidDecl()) 5628 Record->setInvalidDecl(); 5629 5630 if (NewFD->isInvalidDecl() && PrevDecl) { 5631 // Don't introduce NewFD into scope; there's already something 5632 // with the same name in the same scope. 5633 } else if (II) { 5634 PushOnScopeChains(NewFD, S); 5635 } else 5636 Record->addDecl(NewFD); 5637 5638 return NewFD; 5639} 5640 5641/// \brief Build a new FieldDecl and check its well-formedness. 5642/// 5643/// This routine builds a new FieldDecl given the fields name, type, 5644/// record, etc. \p PrevDecl should refer to any previous declaration 5645/// with the same name and in the same scope as the field to be 5646/// created. 5647/// 5648/// \returns a new FieldDecl. 5649/// 5650/// \todo The Declarator argument is a hack. It will be removed once 5651FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 5652 TypeSourceInfo *TInfo, 5653 RecordDecl *Record, SourceLocation Loc, 5654 bool Mutable, Expr *BitWidth, 5655 SourceLocation TSSL, 5656 AccessSpecifier AS, NamedDecl *PrevDecl, 5657 Declarator *D) { 5658 IdentifierInfo *II = Name.getAsIdentifierInfo(); 5659 bool InvalidDecl = false; 5660 if (D) InvalidDecl = D->isInvalidType(); 5661 5662 // If we receive a broken type, recover by assuming 'int' and 5663 // marking this declaration as invalid. 5664 if (T.isNull()) { 5665 InvalidDecl = true; 5666 T = Context.IntTy; 5667 } 5668 5669 QualType EltTy = Context.getBaseElementType(T); 5670 if (!EltTy->isDependentType() && 5671 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) 5672 InvalidDecl = true; 5673 5674 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5675 // than a variably modified type. 5676 if (!InvalidDecl && T->isVariablyModifiedType()) { 5677 bool SizeIsNegative; 5678 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 5679 SizeIsNegative); 5680 if (!FixedTy.isNull()) { 5681 Diag(Loc, diag::warn_illegal_constant_array_size); 5682 T = FixedTy; 5683 } else { 5684 if (SizeIsNegative) 5685 Diag(Loc, diag::err_typecheck_negative_array_size); 5686 else 5687 Diag(Loc, diag::err_typecheck_field_variable_size); 5688 InvalidDecl = true; 5689 } 5690 } 5691 5692 // Fields can not have abstract class types 5693 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 5694 diag::err_abstract_type_in_decl, 5695 AbstractFieldType)) 5696 InvalidDecl = true; 5697 5698 bool ZeroWidth = false; 5699 // If this is declared as a bit-field, check the bit-field. 5700 if (!InvalidDecl && BitWidth && 5701 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 5702 InvalidDecl = true; 5703 DeleteExpr(BitWidth); 5704 BitWidth = 0; 5705 ZeroWidth = false; 5706 } 5707 5708 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 5709 BitWidth, Mutable); 5710 if (InvalidDecl) 5711 NewFD->setInvalidDecl(); 5712 5713 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 5714 Diag(Loc, diag::err_duplicate_member) << II; 5715 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5716 NewFD->setInvalidDecl(); 5717 } 5718 5719 if (!InvalidDecl && getLangOptions().CPlusPlus) { 5720 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 5721 5722 if (!T->isPODType()) 5723 CXXRecord->setPOD(false); 5724 if (!ZeroWidth) 5725 CXXRecord->setEmpty(false); 5726 5727 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 5728 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 5729 5730 if (!RDecl->hasTrivialConstructor()) 5731 CXXRecord->setHasTrivialConstructor(false); 5732 if (!RDecl->hasTrivialCopyConstructor()) 5733 CXXRecord->setHasTrivialCopyConstructor(false); 5734 if (!RDecl->hasTrivialCopyAssignment()) 5735 CXXRecord->setHasTrivialCopyAssignment(false); 5736 if (!RDecl->hasTrivialDestructor()) 5737 CXXRecord->setHasTrivialDestructor(false); 5738 5739 // C++ 9.5p1: An object of a class with a non-trivial 5740 // constructor, a non-trivial copy constructor, a non-trivial 5741 // destructor, or a non-trivial copy assignment operator 5742 // cannot be a member of a union, nor can an array of such 5743 // objects. 5744 // TODO: C++0x alters this restriction significantly. 5745 if (Record->isUnion()) { 5746 // We check for copy constructors before constructors 5747 // because otherwise we'll never get complaints about 5748 // copy constructors. 5749 5750 CXXSpecialMember member = CXXInvalid; 5751 if (!RDecl->hasTrivialCopyConstructor()) 5752 member = CXXCopyConstructor; 5753 else if (!RDecl->hasTrivialConstructor()) 5754 member = CXXConstructor; 5755 else if (!RDecl->hasTrivialCopyAssignment()) 5756 member = CXXCopyAssignment; 5757 else if (!RDecl->hasTrivialDestructor()) 5758 member = CXXDestructor; 5759 5760 if (member != CXXInvalid) { 5761 Diag(Loc, diag::err_illegal_union_member) << Name << member; 5762 DiagnoseNontrivial(RT, member); 5763 NewFD->setInvalidDecl(); 5764 } 5765 } 5766 } 5767 } 5768 5769 // FIXME: We need to pass in the attributes given an AST 5770 // representation, not a parser representation. 5771 if (D) 5772 // FIXME: What to pass instead of TUScope? 5773 ProcessDeclAttributes(TUScope, NewFD, *D); 5774 5775 if (T.isObjCGCWeak()) 5776 Diag(Loc, diag::warn_attribute_weak_on_field); 5777 5778 NewFD->setAccess(AS); 5779 5780 // C++ [dcl.init.aggr]p1: 5781 // An aggregate is an array or a class (clause 9) with [...] no 5782 // private or protected non-static data members (clause 11). 5783 // A POD must be an aggregate. 5784 if (getLangOptions().CPlusPlus && 5785 (AS == AS_private || AS == AS_protected)) { 5786 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 5787 CXXRecord->setAggregate(false); 5788 CXXRecord->setPOD(false); 5789 } 5790 5791 return NewFD; 5792} 5793 5794/// DiagnoseNontrivial - Given that a class has a non-trivial 5795/// special member, figure out why. 5796void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 5797 QualType QT(T, 0U); 5798 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 5799 5800 // Check whether the member was user-declared. 5801 switch (member) { 5802 case CXXInvalid: 5803 break; 5804 5805 case CXXConstructor: 5806 if (RD->hasUserDeclaredConstructor()) { 5807 typedef CXXRecordDecl::ctor_iterator ctor_iter; 5808 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 5809 const FunctionDecl *body = 0; 5810 ci->getBody(body); 5811 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 5812 SourceLocation CtorLoc = ci->getLocation(); 5813 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5814 return; 5815 } 5816 } 5817 5818 assert(0 && "found no user-declared constructors"); 5819 return; 5820 } 5821 break; 5822 5823 case CXXCopyConstructor: 5824 if (RD->hasUserDeclaredCopyConstructor()) { 5825 SourceLocation CtorLoc = 5826 RD->getCopyConstructor(Context, 0)->getLocation(); 5827 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5828 return; 5829 } 5830 break; 5831 5832 case CXXCopyAssignment: 5833 if (RD->hasUserDeclaredCopyAssignment()) { 5834 // FIXME: this should use the location of the copy 5835 // assignment, not the type. 5836 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 5837 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 5838 return; 5839 } 5840 break; 5841 5842 case CXXDestructor: 5843 if (RD->hasUserDeclaredDestructor()) { 5844 SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation(); 5845 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5846 return; 5847 } 5848 break; 5849 } 5850 5851 typedef CXXRecordDecl::base_class_iterator base_iter; 5852 5853 // Virtual bases and members inhibit trivial copying/construction, 5854 // but not trivial destruction. 5855 if (member != CXXDestructor) { 5856 // Check for virtual bases. vbases includes indirect virtual bases, 5857 // so we just iterate through the direct bases. 5858 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 5859 if (bi->isVirtual()) { 5860 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5861 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 5862 return; 5863 } 5864 5865 // Check for virtual methods. 5866 typedef CXXRecordDecl::method_iterator meth_iter; 5867 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 5868 ++mi) { 5869 if (mi->isVirtual()) { 5870 SourceLocation MLoc = mi->getSourceRange().getBegin(); 5871 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 5872 return; 5873 } 5874 } 5875 } 5876 5877 bool (CXXRecordDecl::*hasTrivial)() const; 5878 switch (member) { 5879 case CXXConstructor: 5880 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 5881 case CXXCopyConstructor: 5882 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 5883 case CXXCopyAssignment: 5884 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 5885 case CXXDestructor: 5886 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 5887 default: 5888 assert(0 && "unexpected special member"); return; 5889 } 5890 5891 // Check for nontrivial bases (and recurse). 5892 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 5893 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 5894 assert(BaseRT && "Don't know how to handle dependent bases"); 5895 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 5896 if (!(BaseRecTy->*hasTrivial)()) { 5897 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5898 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 5899 DiagnoseNontrivial(BaseRT, member); 5900 return; 5901 } 5902 } 5903 5904 // Check for nontrivial members (and recurse). 5905 typedef RecordDecl::field_iterator field_iter; 5906 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 5907 ++fi) { 5908 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 5909 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 5910 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 5911 5912 if (!(EltRD->*hasTrivial)()) { 5913 SourceLocation FLoc = (*fi)->getLocation(); 5914 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 5915 DiagnoseNontrivial(EltRT, member); 5916 return; 5917 } 5918 } 5919 } 5920 5921 assert(0 && "found no explanation for non-trivial member"); 5922} 5923 5924/// TranslateIvarVisibility - Translate visibility from a token ID to an 5925/// AST enum value. 5926static ObjCIvarDecl::AccessControl 5927TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 5928 switch (ivarVisibility) { 5929 default: assert(0 && "Unknown visitibility kind"); 5930 case tok::objc_private: return ObjCIvarDecl::Private; 5931 case tok::objc_public: return ObjCIvarDecl::Public; 5932 case tok::objc_protected: return ObjCIvarDecl::Protected; 5933 case tok::objc_package: return ObjCIvarDecl::Package; 5934 } 5935} 5936 5937/// ActOnIvar - Each ivar field of an objective-c class is passed into this 5938/// in order to create an IvarDecl object for it. 5939Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 5940 SourceLocation DeclStart, 5941 DeclPtrTy IntfDecl, 5942 Declarator &D, ExprTy *BitfieldWidth, 5943 tok::ObjCKeywordKind Visibility) { 5944 5945 IdentifierInfo *II = D.getIdentifier(); 5946 Expr *BitWidth = (Expr*)BitfieldWidth; 5947 SourceLocation Loc = DeclStart; 5948 if (II) Loc = D.getIdentifierLoc(); 5949 5950 // FIXME: Unnamed fields can be handled in various different ways, for 5951 // example, unnamed unions inject all members into the struct namespace! 5952 5953 TypeSourceInfo *TInfo = 0; 5954 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5955 5956 if (BitWidth) { 5957 // 6.7.2.1p3, 6.7.2.1p4 5958 if (VerifyBitField(Loc, II, T, BitWidth)) { 5959 D.setInvalidType(); 5960 DeleteExpr(BitWidth); 5961 BitWidth = 0; 5962 } 5963 } else { 5964 // Not a bitfield. 5965 5966 // validate II. 5967 5968 } 5969 if (T->isReferenceType()) { 5970 Diag(Loc, diag::err_ivar_reference_type); 5971 D.setInvalidType(); 5972 } 5973 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5974 // than a variably modified type. 5975 else if (T->isVariablyModifiedType()) { 5976 Diag(Loc, diag::err_typecheck_ivar_variable_size); 5977 D.setInvalidType(); 5978 } 5979 5980 // Get the visibility (access control) for this ivar. 5981 ObjCIvarDecl::AccessControl ac = 5982 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 5983 : ObjCIvarDecl::None; 5984 // Must set ivar's DeclContext to its enclosing interface. 5985 ObjCContainerDecl *EnclosingDecl = IntfDecl.getAs<ObjCContainerDecl>(); 5986 ObjCContainerDecl *EnclosingContext; 5987 if (ObjCImplementationDecl *IMPDecl = 5988 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5989 // Case of ivar declared in an implementation. Context is that of its class. 5990 EnclosingContext = IMPDecl->getClassInterface(); 5991 assert(EnclosingContext && "Implementation has no class interface!"); 5992 } else { 5993 if (ObjCCategoryDecl *CDecl = 5994 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 5995 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 5996 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 5997 return DeclPtrTy(); 5998 } 5999 } 6000 EnclosingContext = EnclosingDecl; 6001 } 6002 6003 // Construct the decl. 6004 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 6005 EnclosingContext, Loc, II, T, 6006 TInfo, ac, (Expr *)BitfieldWidth); 6007 6008 if (II) { 6009 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 6010 ForRedeclaration); 6011 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 6012 && !isa<TagDecl>(PrevDecl)) { 6013 Diag(Loc, diag::err_duplicate_member) << II; 6014 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6015 NewID->setInvalidDecl(); 6016 } 6017 } 6018 6019 // Process attributes attached to the ivar. 6020 ProcessDeclAttributes(S, NewID, D); 6021 6022 if (D.isInvalidType()) 6023 NewID->setInvalidDecl(); 6024 6025 if (II) { 6026 // FIXME: When interfaces are DeclContexts, we'll need to add 6027 // these to the interface. 6028 S->AddDecl(DeclPtrTy::make(NewID)); 6029 IdResolver.AddDecl(NewID); 6030 } 6031 6032 return DeclPtrTy::make(NewID); 6033} 6034 6035void Sema::ActOnFields(Scope* S, 6036 SourceLocation RecLoc, DeclPtrTy RecDecl, 6037 DeclPtrTy *Fields, unsigned NumFields, 6038 SourceLocation LBrac, SourceLocation RBrac, 6039 AttributeList *Attr) { 6040 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 6041 assert(EnclosingDecl && "missing record or interface decl"); 6042 6043 // If the decl this is being inserted into is invalid, then it may be a 6044 // redeclaration or some other bogus case. Don't try to add fields to it. 6045 if (EnclosingDecl->isInvalidDecl()) { 6046 // FIXME: Deallocate fields? 6047 return; 6048 } 6049 6050 6051 // Verify that all the fields are okay. 6052 unsigned NumNamedMembers = 0; 6053 llvm::SmallVector<FieldDecl*, 32> RecFields; 6054 6055 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 6056 for (unsigned i = 0; i != NumFields; ++i) { 6057 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 6058 6059 // Get the type for the field. 6060 Type *FDTy = FD->getType().getTypePtr(); 6061 6062 if (!FD->isAnonymousStructOrUnion()) { 6063 // Remember all fields written by the user. 6064 RecFields.push_back(FD); 6065 } 6066 6067 // If the field is already invalid for some reason, don't emit more 6068 // diagnostics about it. 6069 if (FD->isInvalidDecl()) { 6070 EnclosingDecl->setInvalidDecl(); 6071 continue; 6072 } 6073 6074 // C99 6.7.2.1p2: 6075 // A structure or union shall not contain a member with 6076 // incomplete or function type (hence, a structure shall not 6077 // contain an instance of itself, but may contain a pointer to 6078 // an instance of itself), except that the last member of a 6079 // structure with more than one named member may have incomplete 6080 // array type; such a structure (and any union containing, 6081 // possibly recursively, a member that is such a structure) 6082 // shall not be a member of a structure or an element of an 6083 // array. 6084 if (FDTy->isFunctionType()) { 6085 // Field declared as a function. 6086 Diag(FD->getLocation(), diag::err_field_declared_as_function) 6087 << FD->getDeclName(); 6088 FD->setInvalidDecl(); 6089 EnclosingDecl->setInvalidDecl(); 6090 continue; 6091 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 6092 Record && Record->isStruct()) { 6093 // Flexible array member. 6094 if (NumNamedMembers < 1) { 6095 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 6096 << FD->getDeclName(); 6097 FD->setInvalidDecl(); 6098 EnclosingDecl->setInvalidDecl(); 6099 continue; 6100 } 6101 // Okay, we have a legal flexible array member at the end of the struct. 6102 if (Record) 6103 Record->setHasFlexibleArrayMember(true); 6104 } else if (!FDTy->isDependentType() && 6105 RequireCompleteType(FD->getLocation(), FD->getType(), 6106 diag::err_field_incomplete)) { 6107 // Incomplete type 6108 FD->setInvalidDecl(); 6109 EnclosingDecl->setInvalidDecl(); 6110 continue; 6111 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 6112 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 6113 // If this is a member of a union, then entire union becomes "flexible". 6114 if (Record && Record->isUnion()) { 6115 Record->setHasFlexibleArrayMember(true); 6116 } else { 6117 // If this is a struct/class and this is not the last element, reject 6118 // it. Note that GCC supports variable sized arrays in the middle of 6119 // structures. 6120 if (i != NumFields-1) 6121 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 6122 << FD->getDeclName() << FD->getType(); 6123 else { 6124 // We support flexible arrays at the end of structs in 6125 // other structs as an extension. 6126 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 6127 << FD->getDeclName(); 6128 if (Record) 6129 Record->setHasFlexibleArrayMember(true); 6130 } 6131 } 6132 } 6133 if (Record && FDTTy->getDecl()->hasObjectMember()) 6134 Record->setHasObjectMember(true); 6135 } else if (FDTy->isObjCInterfaceType()) { 6136 /// A field cannot be an Objective-c object 6137 Diag(FD->getLocation(), diag::err_statically_allocated_object); 6138 FD->setInvalidDecl(); 6139 EnclosingDecl->setInvalidDecl(); 6140 continue; 6141 } else if (getLangOptions().ObjC1 && 6142 getLangOptions().getGCMode() != LangOptions::NonGC && 6143 Record && 6144 (FD->getType()->isObjCObjectPointerType() || 6145 FD->getType().isObjCGCStrong())) 6146 Record->setHasObjectMember(true); 6147 // Keep track of the number of named members. 6148 if (FD->getIdentifier()) 6149 ++NumNamedMembers; 6150 } 6151 6152 // Okay, we successfully defined 'Record'. 6153 if (Record) { 6154 Record->completeDefinition(); 6155 } else { 6156 ObjCIvarDecl **ClsFields = 6157 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 6158 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 6159 ID->setLocEnd(RBrac); 6160 // Add ivar's to class's DeclContext. 6161 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6162 ClsFields[i]->setLexicalDeclContext(ID); 6163 ID->addDecl(ClsFields[i]); 6164 } 6165 // Must enforce the rule that ivars in the base classes may not be 6166 // duplicates. 6167 if (ID->getSuperClass()) 6168 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 6169 } else if (ObjCImplementationDecl *IMPDecl = 6170 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6171 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 6172 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 6173 // Ivar declared in @implementation never belongs to the implementation. 6174 // Only it is in implementation's lexical context. 6175 ClsFields[I]->setLexicalDeclContext(IMPDecl); 6176 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 6177 } else if (ObjCCategoryDecl *CDecl = 6178 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6179 // case of ivars in class extension; all other cases have been 6180 // reported as errors elsewhere. 6181 // FIXME. Class extension does not have a LocEnd field. 6182 // CDecl->setLocEnd(RBrac); 6183 // Add ivar's to class extension's DeclContext. 6184 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6185 ClsFields[i]->setLexicalDeclContext(CDecl); 6186 CDecl->addDecl(ClsFields[i]); 6187 } 6188 } 6189 } 6190 6191 if (Attr) 6192 ProcessDeclAttributeList(S, Record, Attr); 6193} 6194 6195/// \brief Determine whether the given integral value is representable within 6196/// the given type T. 6197static bool isRepresentableIntegerValue(ASTContext &Context, 6198 llvm::APSInt &Value, 6199 QualType T) { 6200 assert(T->isIntegralType() && "Integral type required!"); 6201 unsigned BitWidth = Context.getIntWidth(T); 6202 6203 if (Value.isUnsigned() || Value.isNonNegative()) 6204 return Value.getActiveBits() < BitWidth; 6205 6206 return Value.getMinSignedBits() <= BitWidth; 6207} 6208 6209// \brief Given an integral type, return the next larger integral type 6210// (or a NULL type of no such type exists). 6211static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 6212 // FIXME: Int128/UInt128 support, which also needs to be introduced into 6213 // enum checking below. 6214 assert(T->isIntegralType() && "Integral type required!"); 6215 const unsigned NumTypes = 4; 6216 QualType SignedIntegralTypes[NumTypes] = { 6217 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 6218 }; 6219 QualType UnsignedIntegralTypes[NumTypes] = { 6220 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 6221 Context.UnsignedLongLongTy 6222 }; 6223 6224 unsigned BitWidth = Context.getTypeSize(T); 6225 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 6226 : UnsignedIntegralTypes; 6227 for (unsigned I = 0; I != NumTypes; ++I) 6228 if (Context.getTypeSize(Types[I]) > BitWidth) 6229 return Types[I]; 6230 6231 return QualType(); 6232} 6233 6234EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 6235 EnumConstantDecl *LastEnumConst, 6236 SourceLocation IdLoc, 6237 IdentifierInfo *Id, 6238 ExprArg val) { 6239 Expr *Val = (Expr *)val.get(); 6240 6241 unsigned IntWidth = Context.Target.getIntWidth(); 6242 llvm::APSInt EnumVal(IntWidth); 6243 QualType EltTy; 6244 if (Val) { 6245 if (Enum->isDependentType() || Val->isTypeDependent()) 6246 EltTy = Context.DependentTy; 6247 else { 6248 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 6249 SourceLocation ExpLoc; 6250 if (!Val->isValueDependent() && 6251 VerifyIntegerConstantExpression(Val, &EnumVal)) { 6252 Val = 0; 6253 } else { 6254 if (!getLangOptions().CPlusPlus) { 6255 // C99 6.7.2.2p2: 6256 // The expression that defines the value of an enumeration constant 6257 // shall be an integer constant expression that has a value 6258 // representable as an int. 6259 6260 // Complain if the value is not representable in an int. 6261 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 6262 Diag(IdLoc, diag::ext_enum_value_not_int) 6263 << EnumVal.toString(10) << Val->getSourceRange() 6264 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 6265 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 6266 // Force the type of the expression to 'int'. 6267 ImpCastExprToType(Val, Context.IntTy, CastExpr::CK_IntegralCast); 6268 6269 if (Val != val.get()) { 6270 val.release(); 6271 val = Val; 6272 } 6273 } 6274 } 6275 6276 // C++0x [dcl.enum]p5: 6277 // If the underlying type is not fixed, the type of each enumerator 6278 // is the type of its initializing value: 6279 // - If an initializer is specified for an enumerator, the 6280 // initializing value has the same type as the expression. 6281 EltTy = Val->getType(); 6282 } 6283 } 6284 } 6285 6286 if (!Val) { 6287 if (Enum->isDependentType()) 6288 EltTy = Context.DependentTy; 6289 else if (!LastEnumConst) { 6290 // C++0x [dcl.enum]p5: 6291 // If the underlying type is not fixed, the type of each enumerator 6292 // is the type of its initializing value: 6293 // - If no initializer is specified for the first enumerator, the 6294 // initializing value has an unspecified integral type. 6295 // 6296 // GCC uses 'int' for its unspecified integral type, as does 6297 // C99 6.7.2.2p3. 6298 EltTy = Context.IntTy; 6299 } else { 6300 // Assign the last value + 1. 6301 EnumVal = LastEnumConst->getInitVal(); 6302 ++EnumVal; 6303 EltTy = LastEnumConst->getType(); 6304 6305 // Check for overflow on increment. 6306 if (EnumVal < LastEnumConst->getInitVal()) { 6307 // C++0x [dcl.enum]p5: 6308 // If the underlying type is not fixed, the type of each enumerator 6309 // is the type of its initializing value: 6310 // 6311 // - Otherwise the type of the initializing value is the same as 6312 // the type of the initializing value of the preceding enumerator 6313 // unless the incremented value is not representable in that type, 6314 // in which case the type is an unspecified integral type 6315 // sufficient to contain the incremented value. If no such type 6316 // exists, the program is ill-formed. 6317 QualType T = getNextLargerIntegralType(Context, EltTy); 6318 if (T.isNull()) { 6319 // There is no integral type larger enough to represent this 6320 // value. Complain, then allow the value to wrap around. 6321 EnumVal = LastEnumConst->getInitVal(); 6322 EnumVal.zext(EnumVal.getBitWidth() * 2); 6323 Diag(IdLoc, diag::warn_enumerator_too_large) 6324 << EnumVal.toString(10); 6325 } else { 6326 EltTy = T; 6327 } 6328 6329 // Retrieve the last enumerator's value, extent that type to the 6330 // type that is supposed to be large enough to represent the incremented 6331 // value, then increment. 6332 EnumVal = LastEnumConst->getInitVal(); 6333 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6334 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 6335 ++EnumVal; 6336 6337 // If we're not in C++, diagnose the overflow of enumerator values, 6338 // which in C99 means that the enumerator value is not representable in 6339 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 6340 // permits enumerator values that are representable in some larger 6341 // integral type. 6342 if (!getLangOptions().CPlusPlus && !T.isNull()) 6343 Diag(IdLoc, diag::warn_enum_value_overflow); 6344 } else if (!getLangOptions().CPlusPlus && 6345 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 6346 // Enforce C99 6.7.2.2p2 even when we compute the next value. 6347 Diag(IdLoc, diag::ext_enum_value_not_int) 6348 << EnumVal.toString(10) << 1; 6349 } 6350 } 6351 } 6352 6353 if (!EltTy->isDependentType()) { 6354 // Make the enumerator value match the signedness and size of the 6355 // enumerator's type. 6356 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 6357 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6358 } 6359 6360 val.release(); 6361 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 6362 Val, EnumVal); 6363} 6364 6365 6366Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 6367 DeclPtrTy lastEnumConst, 6368 SourceLocation IdLoc, 6369 IdentifierInfo *Id, 6370 SourceLocation EqualLoc, ExprTy *val) { 6371 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 6372 EnumConstantDecl *LastEnumConst = 6373 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 6374 Expr *Val = static_cast<Expr*>(val); 6375 6376 // The scope passed in may not be a decl scope. Zip up the scope tree until 6377 // we find one that is. 6378 S = getNonFieldDeclScope(S); 6379 6380 // Verify that there isn't already something declared with this name in this 6381 // scope. 6382 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 6383 ForRedeclaration); 6384 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6385 // Maybe we will complain about the shadowed template parameter. 6386 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 6387 // Just pretend that we didn't see the previous declaration. 6388 PrevDecl = 0; 6389 } 6390 6391 if (PrevDecl) { 6392 // When in C++, we may get a TagDecl with the same name; in this case the 6393 // enum constant will 'hide' the tag. 6394 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 6395 "Received TagDecl when not in C++!"); 6396 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 6397 if (isa<EnumConstantDecl>(PrevDecl)) 6398 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 6399 else 6400 Diag(IdLoc, diag::err_redefinition) << Id; 6401 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6402 if (Val) Val->Destroy(Context); 6403 return DeclPtrTy(); 6404 } 6405 } 6406 6407 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 6408 IdLoc, Id, Owned(Val)); 6409 6410 // Register this decl in the current scope stack. 6411 if (New) { 6412 New->setAccess(TheEnumDecl->getAccess()); 6413 PushOnScopeChains(New, S); 6414 } 6415 6416 return DeclPtrTy::make(New); 6417} 6418 6419void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 6420 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 6421 DeclPtrTy *Elements, unsigned NumElements, 6422 Scope *S, AttributeList *Attr) { 6423 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 6424 QualType EnumType = Context.getTypeDeclType(Enum); 6425 6426 if (Attr) 6427 ProcessDeclAttributeList(S, Enum, Attr); 6428 6429 if (Enum->isDependentType()) { 6430 for (unsigned i = 0; i != NumElements; ++i) { 6431 EnumConstantDecl *ECD = 6432 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6433 if (!ECD) continue; 6434 6435 ECD->setType(EnumType); 6436 } 6437 6438 Enum->completeDefinition(Context.DependentTy, Context.DependentTy); 6439 return; 6440 } 6441 6442 // TODO: If the result value doesn't fit in an int, it must be a long or long 6443 // long value. ISO C does not support this, but GCC does as an extension, 6444 // emit a warning. 6445 unsigned IntWidth = Context.Target.getIntWidth(); 6446 unsigned CharWidth = Context.Target.getCharWidth(); 6447 unsigned ShortWidth = Context.Target.getShortWidth(); 6448 6449 // Verify that all the values are okay, compute the size of the values, and 6450 // reverse the list. 6451 unsigned NumNegativeBits = 0; 6452 unsigned NumPositiveBits = 0; 6453 6454 // Keep track of whether all elements have type int. 6455 bool AllElementsInt = true; 6456 6457 for (unsigned i = 0; i != NumElements; ++i) { 6458 EnumConstantDecl *ECD = 6459 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6460 if (!ECD) continue; // Already issued a diagnostic. 6461 6462 const llvm::APSInt &InitVal = ECD->getInitVal(); 6463 6464 // Keep track of the size of positive and negative values. 6465 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 6466 NumPositiveBits = std::max(NumPositiveBits, 6467 (unsigned)InitVal.getActiveBits()); 6468 else 6469 NumNegativeBits = std::max(NumNegativeBits, 6470 (unsigned)InitVal.getMinSignedBits()); 6471 6472 // Keep track of whether every enum element has type int (very commmon). 6473 if (AllElementsInt) 6474 AllElementsInt = ECD->getType() == Context.IntTy; 6475 } 6476 6477 // Figure out the type that should be used for this enum. 6478 // FIXME: Support -fshort-enums. 6479 QualType BestType; 6480 unsigned BestWidth; 6481 6482 // C++0x N3000 [conv.prom]p3: 6483 // An rvalue of an unscoped enumeration type whose underlying 6484 // type is not fixed can be converted to an rvalue of the first 6485 // of the following types that can represent all the values of 6486 // the enumeration: int, unsigned int, long int, unsigned long 6487 // int, long long int, or unsigned long long int. 6488 // C99 6.4.4.3p2: 6489 // An identifier declared as an enumeration constant has type int. 6490 // The C99 rule is modified by a gcc extension 6491 QualType BestPromotionType; 6492 6493 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 6494 6495 if (NumNegativeBits) { 6496 // If there is a negative value, figure out the smallest integer type (of 6497 // int/long/longlong) that fits. 6498 // If it's packed, check also if it fits a char or a short. 6499 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 6500 BestType = Context.SignedCharTy; 6501 BestWidth = CharWidth; 6502 } else if (Packed && NumNegativeBits <= ShortWidth && 6503 NumPositiveBits < ShortWidth) { 6504 BestType = Context.ShortTy; 6505 BestWidth = ShortWidth; 6506 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 6507 BestType = Context.IntTy; 6508 BestWidth = IntWidth; 6509 } else { 6510 BestWidth = Context.Target.getLongWidth(); 6511 6512 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 6513 BestType = Context.LongTy; 6514 } else { 6515 BestWidth = Context.Target.getLongLongWidth(); 6516 6517 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 6518 Diag(Enum->getLocation(), diag::warn_enum_too_large); 6519 BestType = Context.LongLongTy; 6520 } 6521 } 6522 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 6523 } else { 6524 // If there is no negative value, figure out the smallest type that fits 6525 // all of the enumerator values. 6526 // If it's packed, check also if it fits a char or a short. 6527 if (Packed && NumPositiveBits <= CharWidth) { 6528 BestType = Context.UnsignedCharTy; 6529 BestPromotionType = Context.IntTy; 6530 BestWidth = CharWidth; 6531 } else if (Packed && NumPositiveBits <= ShortWidth) { 6532 BestType = Context.UnsignedShortTy; 6533 BestPromotionType = Context.IntTy; 6534 BestWidth = ShortWidth; 6535 } else if (NumPositiveBits <= IntWidth) { 6536 BestType = Context.UnsignedIntTy; 6537 BestWidth = IntWidth; 6538 BestPromotionType 6539 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6540 ? Context.UnsignedIntTy : Context.IntTy; 6541 } else if (NumPositiveBits <= 6542 (BestWidth = Context.Target.getLongWidth())) { 6543 BestType = Context.UnsignedLongTy; 6544 BestPromotionType 6545 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6546 ? Context.UnsignedLongTy : Context.LongTy; 6547 } else { 6548 BestWidth = Context.Target.getLongLongWidth(); 6549 assert(NumPositiveBits <= BestWidth && 6550 "How could an initializer get larger than ULL?"); 6551 BestType = Context.UnsignedLongLongTy; 6552 BestPromotionType 6553 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6554 ? Context.UnsignedLongLongTy : Context.LongLongTy; 6555 } 6556 } 6557 6558 // Loop over all of the enumerator constants, changing their types to match 6559 // the type of the enum if needed. 6560 for (unsigned i = 0; i != NumElements; ++i) { 6561 EnumConstantDecl *ECD = 6562 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6563 if (!ECD) continue; // Already issued a diagnostic. 6564 6565 // Standard C says the enumerators have int type, but we allow, as an 6566 // extension, the enumerators to be larger than int size. If each 6567 // enumerator value fits in an int, type it as an int, otherwise type it the 6568 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 6569 // that X has type 'int', not 'unsigned'. 6570 6571 // Determine whether the value fits into an int. 6572 llvm::APSInt InitVal = ECD->getInitVal(); 6573 6574 // If it fits into an integer type, force it. Otherwise force it to match 6575 // the enum decl type. 6576 QualType NewTy; 6577 unsigned NewWidth; 6578 bool NewSign; 6579 if (!getLangOptions().CPlusPlus && 6580 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 6581 NewTy = Context.IntTy; 6582 NewWidth = IntWidth; 6583 NewSign = true; 6584 } else if (ECD->getType() == BestType) { 6585 // Already the right type! 6586 if (getLangOptions().CPlusPlus) 6587 // C++ [dcl.enum]p4: Following the closing brace of an 6588 // enum-specifier, each enumerator has the type of its 6589 // enumeration. 6590 ECD->setType(EnumType); 6591 continue; 6592 } else { 6593 NewTy = BestType; 6594 NewWidth = BestWidth; 6595 NewSign = BestType->isSignedIntegerType(); 6596 } 6597 6598 // Adjust the APSInt value. 6599 InitVal.extOrTrunc(NewWidth); 6600 InitVal.setIsSigned(NewSign); 6601 ECD->setInitVal(InitVal); 6602 6603 // Adjust the Expr initializer and type. 6604 if (ECD->getInitExpr()) 6605 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, 6606 CastExpr::CK_IntegralCast, 6607 ECD->getInitExpr(), 6608 CXXBaseSpecifierArray(), 6609 /*isLvalue=*/false)); 6610 if (getLangOptions().CPlusPlus) 6611 // C++ [dcl.enum]p4: Following the closing brace of an 6612 // enum-specifier, each enumerator has the type of its 6613 // enumeration. 6614 ECD->setType(EnumType); 6615 else 6616 ECD->setType(NewTy); 6617 } 6618 6619 Enum->completeDefinition(BestType, BestPromotionType); 6620} 6621 6622Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 6623 ExprArg expr) { 6624 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 6625 6626 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 6627 Loc, AsmString); 6628 CurContext->addDecl(New); 6629 return DeclPtrTy::make(New); 6630} 6631 6632void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 6633 SourceLocation PragmaLoc, 6634 SourceLocation NameLoc) { 6635 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 6636 6637 if (PrevDecl) { 6638 PrevDecl->addAttr(::new (Context) WeakAttr()); 6639 } else { 6640 (void)WeakUndeclaredIdentifiers.insert( 6641 std::pair<IdentifierInfo*,WeakInfo> 6642 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 6643 } 6644} 6645 6646void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 6647 IdentifierInfo* AliasName, 6648 SourceLocation PragmaLoc, 6649 SourceLocation NameLoc, 6650 SourceLocation AliasNameLoc) { 6651 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 6652 LookupOrdinaryName); 6653 WeakInfo W = WeakInfo(Name, NameLoc); 6654 6655 if (PrevDecl) { 6656 if (!PrevDecl->hasAttr<AliasAttr>()) 6657 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 6658 DeclApplyPragmaWeak(TUScope, ND, W); 6659 } else { 6660 (void)WeakUndeclaredIdentifiers.insert( 6661 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 6662 } 6663} 6664