SemaDecl.cpp revision 33500955d731c73717af52088b7fc0e7a85681e7
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInit.h" 16#include "Lookup.h" 17#include "clang/AST/APValue.h" 18#include "clang/AST/ASTConsumer.h" 19#include "clang/AST/ASTContext.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclTemplate.h" 22#include "clang/AST/ExprCXX.h" 23#include "clang/AST/StmtCXX.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/ParseDiagnostic.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Basic/SourceManager.h" 29#include "clang/Basic/TargetInfo.h" 30// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 31#include "clang/Lex/Preprocessor.h" 32#include "clang/Lex/HeaderSearch.h" 33#include "llvm/ADT/Triple.h" 34#include <algorithm> 35#include <cstring> 36#include <functional> 37using namespace clang; 38 39/// getDeclName - Return a pretty name for the specified decl if possible, or 40/// an empty string if not. This is used for pretty crash reporting. 41std::string Sema::getDeclName(DeclPtrTy d) { 42 Decl *D = d.getAs<Decl>(); 43 if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 44 return DN->getQualifiedNameAsString(); 45 return ""; 46} 47 48Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) { 49 return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>())); 50} 51 52/// \brief If the identifier refers to a type name within this scope, 53/// return the declaration of that type. 54/// 55/// This routine performs ordinary name lookup of the identifier II 56/// within the given scope, with optional C++ scope specifier SS, to 57/// determine whether the name refers to a type. If so, returns an 58/// opaque pointer (actually a QualType) corresponding to that 59/// type. Otherwise, returns NULL. 60/// 61/// If name lookup results in an ambiguity, this routine will complain 62/// and then return NULL. 63Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 64 Scope *S, CXXScopeSpec *SS, 65 bool isClassName, 66 TypeTy *ObjectTypePtr) { 67 // Determine where we will perform name lookup. 68 DeclContext *LookupCtx = 0; 69 if (ObjectTypePtr) { 70 QualType ObjectType = QualType::getFromOpaquePtr(ObjectTypePtr); 71 if (ObjectType->isRecordType()) 72 LookupCtx = computeDeclContext(ObjectType); 73 } else if (SS && SS->isNotEmpty()) { 74 LookupCtx = computeDeclContext(*SS, false); 75 76 if (!LookupCtx) { 77 if (isDependentScopeSpecifier(*SS)) { 78 // C++ [temp.res]p3: 79 // A qualified-id that refers to a type and in which the 80 // nested-name-specifier depends on a template-parameter (14.6.2) 81 // shall be prefixed by the keyword typename to indicate that the 82 // qualified-id denotes a type, forming an 83 // elaborated-type-specifier (7.1.5.3). 84 // 85 // We therefore do not perform any name lookup if the result would 86 // refer to a member of an unknown specialization. 87 if (!isClassName) 88 return 0; 89 90 // We know from the grammar that this name refers to a type, 91 // so build a dependent node to describe the type. 92 return CheckTypenameType(ETK_None, 93 (NestedNameSpecifier *)SS->getScopeRep(), II, 94 SourceLocation(), SS->getRange(), NameLoc 95 ).getAsOpaquePtr(); 96 } 97 98 return 0; 99 } 100 101 if (!LookupCtx->isDependentContext() && 102 RequireCompleteDeclContext(*SS, LookupCtx)) 103 return 0; 104 } 105 106 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 107 // lookup for class-names. 108 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 109 LookupOrdinaryName; 110 LookupResult Result(*this, &II, NameLoc, Kind); 111 if (LookupCtx) { 112 // Perform "qualified" name lookup into the declaration context we 113 // computed, which is either the type of the base of a member access 114 // expression or the declaration context associated with a prior 115 // nested-name-specifier. 116 LookupQualifiedName(Result, LookupCtx); 117 118 if (ObjectTypePtr && Result.empty()) { 119 // C++ [basic.lookup.classref]p3: 120 // If the unqualified-id is ~type-name, the type-name is looked up 121 // in the context of the entire postfix-expression. If the type T of 122 // the object expression is of a class type C, the type-name is also 123 // looked up in the scope of class C. At least one of the lookups shall 124 // find a name that refers to (possibly cv-qualified) T. 125 LookupName(Result, S); 126 } 127 } else { 128 // Perform unqualified name lookup. 129 LookupName(Result, S); 130 } 131 132 NamedDecl *IIDecl = 0; 133 switch (Result.getResultKind()) { 134 case LookupResult::NotFound: 135 case LookupResult::NotFoundInCurrentInstantiation: 136 case LookupResult::FoundOverloaded: 137 case LookupResult::FoundUnresolvedValue: 138 Result.suppressDiagnostics(); 139 return 0; 140 141 case LookupResult::Ambiguous: 142 // Recover from type-hiding ambiguities by hiding the type. We'll 143 // do the lookup again when looking for an object, and we can 144 // diagnose the error then. If we don't do this, then the error 145 // about hiding the type will be immediately followed by an error 146 // that only makes sense if the identifier was treated like a type. 147 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 148 Result.suppressDiagnostics(); 149 return 0; 150 } 151 152 // Look to see if we have a type anywhere in the list of results. 153 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 154 Res != ResEnd; ++Res) { 155 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 156 if (!IIDecl || 157 (*Res)->getLocation().getRawEncoding() < 158 IIDecl->getLocation().getRawEncoding()) 159 IIDecl = *Res; 160 } 161 } 162 163 if (!IIDecl) { 164 // None of the entities we found is a type, so there is no way 165 // to even assume that the result is a type. In this case, don't 166 // complain about the ambiguity. The parser will either try to 167 // perform this lookup again (e.g., as an object name), which 168 // will produce the ambiguity, or will complain that it expected 169 // a type name. 170 Result.suppressDiagnostics(); 171 return 0; 172 } 173 174 // We found a type within the ambiguous lookup; diagnose the 175 // ambiguity and then return that type. This might be the right 176 // answer, or it might not be, but it suppresses any attempt to 177 // perform the name lookup again. 178 break; 179 180 case LookupResult::Found: 181 IIDecl = Result.getFoundDecl(); 182 break; 183 } 184 185 assert(IIDecl && "Didn't find decl"); 186 187 QualType T; 188 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 189 DiagnoseUseOfDecl(IIDecl, NameLoc); 190 191 if (T.isNull()) 192 T = Context.getTypeDeclType(TD); 193 194 if (SS) 195 T = getElaboratedType(ETK_None, *SS, T); 196 197 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 198 T = Context.getObjCInterfaceType(IDecl); 199 } else { 200 // If it's not plausibly a type, suppress diagnostics. 201 Result.suppressDiagnostics(); 202 return 0; 203 } 204 205 return T.getAsOpaquePtr(); 206} 207 208/// isTagName() - This method is called *for error recovery purposes only* 209/// to determine if the specified name is a valid tag name ("struct foo"). If 210/// so, this returns the TST for the tag corresponding to it (TST_enum, 211/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 212/// where the user forgot to specify the tag. 213DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 214 // Do a tag name lookup in this scope. 215 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 216 LookupName(R, S, false); 217 R.suppressDiagnostics(); 218 if (R.getResultKind() == LookupResult::Found) 219 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 220 switch (TD->getTagKind()) { 221 default: return DeclSpec::TST_unspecified; 222 case TTK_Struct: return DeclSpec::TST_struct; 223 case TTK_Union: return DeclSpec::TST_union; 224 case TTK_Class: return DeclSpec::TST_class; 225 case TTK_Enum: return DeclSpec::TST_enum; 226 } 227 } 228 229 return DeclSpec::TST_unspecified; 230} 231 232bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 233 SourceLocation IILoc, 234 Scope *S, 235 CXXScopeSpec *SS, 236 TypeTy *&SuggestedType) { 237 // We don't have anything to suggest (yet). 238 SuggestedType = 0; 239 240 // There may have been a typo in the name of the type. Look up typo 241 // results, in case we have something that we can suggest. 242 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 243 NotForRedeclaration); 244 245 if (DeclarationName Corrected = CorrectTypo(Lookup, S, SS, 0, 0, CTC_Type)) { 246 if (NamedDecl *Result = Lookup.getAsSingle<NamedDecl>()) { 247 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 248 !Result->isInvalidDecl()) { 249 // We found a similarly-named type or interface; suggest that. 250 if (!SS || !SS->isSet()) 251 Diag(IILoc, diag::err_unknown_typename_suggest) 252 << &II << Lookup.getLookupName() 253 << FixItHint::CreateReplacement(SourceRange(IILoc), 254 Result->getNameAsString()); 255 else if (DeclContext *DC = computeDeclContext(*SS, false)) 256 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 257 << &II << DC << Lookup.getLookupName() << SS->getRange() 258 << FixItHint::CreateReplacement(SourceRange(IILoc), 259 Result->getNameAsString()); 260 else 261 llvm_unreachable("could not have corrected a typo here"); 262 263 Diag(Result->getLocation(), diag::note_previous_decl) 264 << Result->getDeclName(); 265 266 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS); 267 return true; 268 } 269 } else if (Lookup.empty()) { 270 // We corrected to a keyword. 271 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 272 Diag(IILoc, diag::err_unknown_typename_suggest) 273 << &II << Corrected; 274 return true; 275 } 276 } 277 278 if (getLangOptions().CPlusPlus) { 279 // See if II is a class template that the user forgot to pass arguments to. 280 UnqualifiedId Name; 281 Name.setIdentifier(&II, IILoc); 282 CXXScopeSpec EmptySS; 283 TemplateTy TemplateResult; 284 bool MemberOfUnknownSpecialization; 285 if (isTemplateName(S, SS ? *SS : EmptySS, Name, 0, true, TemplateResult, 286 MemberOfUnknownSpecialization) == TNK_Type_template) { 287 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 288 Diag(IILoc, diag::err_template_missing_args) << TplName; 289 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 290 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 291 << TplDecl->getTemplateParameters()->getSourceRange(); 292 } 293 return true; 294 } 295 } 296 297 // FIXME: Should we move the logic that tries to recover from a missing tag 298 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 299 300 if (!SS || (!SS->isSet() && !SS->isInvalid())) 301 Diag(IILoc, diag::err_unknown_typename) << &II; 302 else if (DeclContext *DC = computeDeclContext(*SS, false)) 303 Diag(IILoc, diag::err_typename_nested_not_found) 304 << &II << DC << SS->getRange(); 305 else if (isDependentScopeSpecifier(*SS)) { 306 Diag(SS->getRange().getBegin(), diag::err_typename_missing) 307 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 308 << SourceRange(SS->getRange().getBegin(), IILoc) 309 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 310 SuggestedType = ActOnTypenameType(SourceLocation(), *SS, II, IILoc).get(); 311 } else { 312 assert(SS && SS->isInvalid() && 313 "Invalid scope specifier has already been diagnosed"); 314 } 315 316 return true; 317} 318 319// Determines the context to return to after temporarily entering a 320// context. This depends in an unnecessarily complicated way on the 321// exact ordering of callbacks from the parser. 322DeclContext *Sema::getContainingDC(DeclContext *DC) { 323 324 // Functions defined inline within classes aren't parsed until we've 325 // finished parsing the top-level class, so the top-level class is 326 // the context we'll need to return to. 327 if (isa<FunctionDecl>(DC)) { 328 DC = DC->getLexicalParent(); 329 330 // A function not defined within a class will always return to its 331 // lexical context. 332 if (!isa<CXXRecordDecl>(DC)) 333 return DC; 334 335 // A C++ inline method/friend is parsed *after* the topmost class 336 // it was declared in is fully parsed ("complete"); the topmost 337 // class is the context we need to return to. 338 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 339 DC = RD; 340 341 // Return the declaration context of the topmost class the inline method is 342 // declared in. 343 return DC; 344 } 345 346 if (isa<ObjCMethodDecl>(DC)) 347 return Context.getTranslationUnitDecl(); 348 349 return DC->getLexicalParent(); 350} 351 352void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 353 assert(getContainingDC(DC) == CurContext && 354 "The next DeclContext should be lexically contained in the current one."); 355 CurContext = DC; 356 S->setEntity(DC); 357} 358 359void Sema::PopDeclContext() { 360 assert(CurContext && "DeclContext imbalance!"); 361 362 CurContext = getContainingDC(CurContext); 363} 364 365/// EnterDeclaratorContext - Used when we must lookup names in the context 366/// of a declarator's nested name specifier. 367/// 368void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 369 // C++0x [basic.lookup.unqual]p13: 370 // A name used in the definition of a static data member of class 371 // X (after the qualified-id of the static member) is looked up as 372 // if the name was used in a member function of X. 373 // C++0x [basic.lookup.unqual]p14: 374 // If a variable member of a namespace is defined outside of the 375 // scope of its namespace then any name used in the definition of 376 // the variable member (after the declarator-id) is looked up as 377 // if the definition of the variable member occurred in its 378 // namespace. 379 // Both of these imply that we should push a scope whose context 380 // is the semantic context of the declaration. We can't use 381 // PushDeclContext here because that context is not necessarily 382 // lexically contained in the current context. Fortunately, 383 // the containing scope should have the appropriate information. 384 385 assert(!S->getEntity() && "scope already has entity"); 386 387#ifndef NDEBUG 388 Scope *Ancestor = S->getParent(); 389 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 390 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 391#endif 392 393 CurContext = DC; 394 S->setEntity(DC); 395} 396 397void Sema::ExitDeclaratorContext(Scope *S) { 398 assert(S->getEntity() == CurContext && "Context imbalance!"); 399 400 // Switch back to the lexical context. The safety of this is 401 // enforced by an assert in EnterDeclaratorContext. 402 Scope *Ancestor = S->getParent(); 403 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 404 CurContext = (DeclContext*) Ancestor->getEntity(); 405 406 // We don't need to do anything with the scope, which is going to 407 // disappear. 408} 409 410/// \brief Determine whether we allow overloading of the function 411/// PrevDecl with another declaration. 412/// 413/// This routine determines whether overloading is possible, not 414/// whether some new function is actually an overload. It will return 415/// true in C++ (where we can always provide overloads) or, as an 416/// extension, in C when the previous function is already an 417/// overloaded function declaration or has the "overloadable" 418/// attribute. 419static bool AllowOverloadingOfFunction(LookupResult &Previous, 420 ASTContext &Context) { 421 if (Context.getLangOptions().CPlusPlus) 422 return true; 423 424 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 425 return true; 426 427 return (Previous.getResultKind() == LookupResult::Found 428 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 429} 430 431/// Add this decl to the scope shadowed decl chains. 432void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 433 // Move up the scope chain until we find the nearest enclosing 434 // non-transparent context. The declaration will be introduced into this 435 // scope. 436 while (S->getEntity() && 437 ((DeclContext *)S->getEntity())->isTransparentContext()) 438 S = S->getParent(); 439 440 // Add scoped declarations into their context, so that they can be 441 // found later. Declarations without a context won't be inserted 442 // into any context. 443 if (AddToContext) 444 CurContext->addDecl(D); 445 446 // Out-of-line definitions shouldn't be pushed into scope in C++. 447 // Out-of-line variable and function definitions shouldn't even in C. 448 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 449 D->isOutOfLine()) 450 return; 451 452 // Template instantiations should also not be pushed into scope. 453 if (isa<FunctionDecl>(D) && 454 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 455 return; 456 457 // If this replaces anything in the current scope, 458 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 459 IEnd = IdResolver.end(); 460 for (; I != IEnd; ++I) { 461 if (S->isDeclScope(DeclPtrTy::make(*I)) && D->declarationReplaces(*I)) { 462 S->RemoveDecl(DeclPtrTy::make(*I)); 463 IdResolver.RemoveDecl(*I); 464 465 // Should only need to replace one decl. 466 break; 467 } 468 } 469 470 S->AddDecl(DeclPtrTy::make(D)); 471 IdResolver.AddDecl(D); 472} 473 474bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) { 475 return IdResolver.isDeclInScope(D, Ctx, Context, S); 476} 477 478static bool isOutOfScopePreviousDeclaration(NamedDecl *, 479 DeclContext*, 480 ASTContext&); 481 482/// Filters out lookup results that don't fall within the given scope 483/// as determined by isDeclInScope. 484static void FilterLookupForScope(Sema &SemaRef, LookupResult &R, 485 DeclContext *Ctx, Scope *S, 486 bool ConsiderLinkage) { 487 LookupResult::Filter F = R.makeFilter(); 488 while (F.hasNext()) { 489 NamedDecl *D = F.next(); 490 491 if (SemaRef.isDeclInScope(D, Ctx, S)) 492 continue; 493 494 if (ConsiderLinkage && 495 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context)) 496 continue; 497 498 F.erase(); 499 } 500 501 F.done(); 502} 503 504static bool isUsingDecl(NamedDecl *D) { 505 return isa<UsingShadowDecl>(D) || 506 isa<UnresolvedUsingTypenameDecl>(D) || 507 isa<UnresolvedUsingValueDecl>(D); 508} 509 510/// Removes using shadow declarations from the lookup results. 511static void RemoveUsingDecls(LookupResult &R) { 512 LookupResult::Filter F = R.makeFilter(); 513 while (F.hasNext()) 514 if (isUsingDecl(F.next())) 515 F.erase(); 516 517 F.done(); 518} 519 520static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 521 if (D->isInvalidDecl()) 522 return false; 523 524 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 525 return false; 526 527 // White-list anything that isn't a local variable. 528 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 529 !D->getDeclContext()->isFunctionOrMethod()) 530 return false; 531 532 // Types of valid local variables should be complete, so this should succeed. 533 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 534 535 // White-list anything with an __attribute__((unused)) type. 536 QualType Ty = VD->getType(); 537 538 // Only look at the outermost level of typedef. 539 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 540 if (TT->getDecl()->hasAttr<UnusedAttr>()) 541 return false; 542 } 543 544 // If we failed to complete the type for some reason, or if the type is 545 // dependent, don't diagnose the variable. 546 if (Ty->isIncompleteType() || Ty->isDependentType()) 547 return false; 548 549 if (const TagType *TT = Ty->getAs<TagType>()) { 550 const TagDecl *Tag = TT->getDecl(); 551 if (Tag->hasAttr<UnusedAttr>()) 552 return false; 553 554 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 555 // FIXME: Checking for the presence of a user-declared constructor 556 // isn't completely accurate; we'd prefer to check that the initializer 557 // has no side effects. 558 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 559 return false; 560 } 561 } 562 563 // TODO: __attribute__((unused)) templates? 564 } 565 566 return true; 567} 568 569void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 570 if (!ShouldDiagnoseUnusedDecl(D)) 571 return; 572 573 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 574 Diag(D->getLocation(), diag::warn_unused_exception_param) 575 << D->getDeclName(); 576 else 577 Diag(D->getLocation(), diag::warn_unused_variable) 578 << D->getDeclName(); 579} 580 581void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 582 if (S->decl_empty()) return; 583 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 584 "Scope shouldn't contain decls!"); 585 586 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 587 I != E; ++I) { 588 Decl *TmpD = (*I).getAs<Decl>(); 589 assert(TmpD && "This decl didn't get pushed??"); 590 591 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 592 NamedDecl *D = cast<NamedDecl>(TmpD); 593 594 if (!D->getDeclName()) continue; 595 596 // Diagnose unused variables in this scope. 597 if (S->getNumErrorsAtStart() == getDiagnostics().getNumErrors()) 598 DiagnoseUnusedDecl(D); 599 600 // Remove this name from our lexical scope. 601 IdResolver.RemoveDecl(D); 602 } 603} 604 605/// \brief Look for an Objective-C class in the translation unit. 606/// 607/// \param Id The name of the Objective-C class we're looking for. If 608/// typo-correction fixes this name, the Id will be updated 609/// to the fixed name. 610/// 611/// \param IdLoc The location of the name in the translation unit. 612/// 613/// \param TypoCorrection If true, this routine will attempt typo correction 614/// if there is no class with the given name. 615/// 616/// \returns The declaration of the named Objective-C class, or NULL if the 617/// class could not be found. 618ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 619 SourceLocation IdLoc, 620 bool TypoCorrection) { 621 // The third "scope" argument is 0 since we aren't enabling lazy built-in 622 // creation from this context. 623 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 624 625 if (!IDecl && TypoCorrection) { 626 // Perform typo correction at the given location, but only if we 627 // find an Objective-C class name. 628 LookupResult R(*this, Id, IdLoc, LookupOrdinaryName); 629 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 630 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 631 Diag(IdLoc, diag::err_undef_interface_suggest) 632 << Id << IDecl->getDeclName() 633 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 634 Diag(IDecl->getLocation(), diag::note_previous_decl) 635 << IDecl->getDeclName(); 636 637 Id = IDecl->getIdentifier(); 638 } 639 } 640 641 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 642} 643 644/// getNonFieldDeclScope - Retrieves the innermost scope, starting 645/// from S, where a non-field would be declared. This routine copes 646/// with the difference between C and C++ scoping rules in structs and 647/// unions. For example, the following code is well-formed in C but 648/// ill-formed in C++: 649/// @code 650/// struct S6 { 651/// enum { BAR } e; 652/// }; 653/// 654/// void test_S6() { 655/// struct S6 a; 656/// a.e = BAR; 657/// } 658/// @endcode 659/// For the declaration of BAR, this routine will return a different 660/// scope. The scope S will be the scope of the unnamed enumeration 661/// within S6. In C++, this routine will return the scope associated 662/// with S6, because the enumeration's scope is a transparent 663/// context but structures can contain non-field names. In C, this 664/// routine will return the translation unit scope, since the 665/// enumeration's scope is a transparent context and structures cannot 666/// contain non-field names. 667Scope *Sema::getNonFieldDeclScope(Scope *S) { 668 while (((S->getFlags() & Scope::DeclScope) == 0) || 669 (S->getEntity() && 670 ((DeclContext *)S->getEntity())->isTransparentContext()) || 671 (S->isClassScope() && !getLangOptions().CPlusPlus)) 672 S = S->getParent(); 673 return S; 674} 675 676void Sema::InitBuiltinVaListType() { 677 if (!Context.getBuiltinVaListType().isNull()) 678 return; 679 680 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 681 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, SourceLocation(), 682 LookupOrdinaryName, ForRedeclaration); 683 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 684 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 685} 686 687/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 688/// file scope. lazily create a decl for it. ForRedeclaration is true 689/// if we're creating this built-in in anticipation of redeclaring the 690/// built-in. 691NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 692 Scope *S, bool ForRedeclaration, 693 SourceLocation Loc) { 694 Builtin::ID BID = (Builtin::ID)bid; 695 696 if (Context.BuiltinInfo.hasVAListUse(BID)) 697 InitBuiltinVaListType(); 698 699 ASTContext::GetBuiltinTypeError Error; 700 QualType R = Context.GetBuiltinType(BID, Error); 701 switch (Error) { 702 case ASTContext::GE_None: 703 // Okay 704 break; 705 706 case ASTContext::GE_Missing_stdio: 707 if (ForRedeclaration) 708 Diag(Loc, diag::err_implicit_decl_requires_stdio) 709 << Context.BuiltinInfo.GetName(BID); 710 return 0; 711 712 case ASTContext::GE_Missing_setjmp: 713 if (ForRedeclaration) 714 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 715 << Context.BuiltinInfo.GetName(BID); 716 return 0; 717 } 718 719 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 720 Diag(Loc, diag::ext_implicit_lib_function_decl) 721 << Context.BuiltinInfo.GetName(BID) 722 << R; 723 if (Context.BuiltinInfo.getHeaderName(BID) && 724 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 725 != Diagnostic::Ignored) 726 Diag(Loc, diag::note_please_include_header) 727 << Context.BuiltinInfo.getHeaderName(BID) 728 << Context.BuiltinInfo.GetName(BID); 729 } 730 731 FunctionDecl *New = FunctionDecl::Create(Context, 732 Context.getTranslationUnitDecl(), 733 Loc, II, R, /*TInfo=*/0, 734 FunctionDecl::Extern, 735 FunctionDecl::None, false, 736 /*hasPrototype=*/true); 737 New->setImplicit(); 738 739 // Create Decl objects for each parameter, adding them to the 740 // FunctionDecl. 741 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 742 llvm::SmallVector<ParmVarDecl*, 16> Params; 743 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 744 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 745 FT->getArgType(i), /*TInfo=*/0, 746 VarDecl::None, VarDecl::None, 0)); 747 New->setParams(Params.data(), Params.size()); 748 } 749 750 AddKnownFunctionAttributes(New); 751 752 // TUScope is the translation-unit scope to insert this function into. 753 // FIXME: This is hideous. We need to teach PushOnScopeChains to 754 // relate Scopes to DeclContexts, and probably eliminate CurContext 755 // entirely, but we're not there yet. 756 DeclContext *SavedContext = CurContext; 757 CurContext = Context.getTranslationUnitDecl(); 758 PushOnScopeChains(New, TUScope); 759 CurContext = SavedContext; 760 return New; 761} 762 763/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 764/// same name and scope as a previous declaration 'Old'. Figure out 765/// how to resolve this situation, merging decls or emitting 766/// diagnostics as appropriate. If there was an error, set New to be invalid. 767/// 768void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 769 // If the new decl is known invalid already, don't bother doing any 770 // merging checks. 771 if (New->isInvalidDecl()) return; 772 773 // Allow multiple definitions for ObjC built-in typedefs. 774 // FIXME: Verify the underlying types are equivalent! 775 if (getLangOptions().ObjC1) { 776 const IdentifierInfo *TypeID = New->getIdentifier(); 777 switch (TypeID->getLength()) { 778 default: break; 779 case 2: 780 if (!TypeID->isStr("id")) 781 break; 782 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 783 // Install the built-in type for 'id', ignoring the current definition. 784 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 785 return; 786 case 5: 787 if (!TypeID->isStr("Class")) 788 break; 789 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 790 // Install the built-in type for 'Class', ignoring the current definition. 791 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 792 return; 793 case 3: 794 if (!TypeID->isStr("SEL")) 795 break; 796 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 797 // Install the built-in type for 'SEL', ignoring the current definition. 798 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 799 return; 800 case 8: 801 if (!TypeID->isStr("Protocol")) 802 break; 803 Context.setObjCProtoType(New->getUnderlyingType()); 804 return; 805 } 806 // Fall through - the typedef name was not a builtin type. 807 } 808 809 // Verify the old decl was also a type. 810 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 811 if (!Old) { 812 Diag(New->getLocation(), diag::err_redefinition_different_kind) 813 << New->getDeclName(); 814 815 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 816 if (OldD->getLocation().isValid()) 817 Diag(OldD->getLocation(), diag::note_previous_definition); 818 819 return New->setInvalidDecl(); 820 } 821 822 // If the old declaration is invalid, just give up here. 823 if (Old->isInvalidDecl()) 824 return New->setInvalidDecl(); 825 826 // Determine the "old" type we'll use for checking and diagnostics. 827 QualType OldType; 828 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 829 OldType = OldTypedef->getUnderlyingType(); 830 else 831 OldType = Context.getTypeDeclType(Old); 832 833 // If the typedef types are not identical, reject them in all languages and 834 // with any extensions enabled. 835 836 if (OldType != New->getUnderlyingType() && 837 Context.getCanonicalType(OldType) != 838 Context.getCanonicalType(New->getUnderlyingType())) { 839 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 840 << New->getUnderlyingType() << OldType; 841 if (Old->getLocation().isValid()) 842 Diag(Old->getLocation(), diag::note_previous_definition); 843 return New->setInvalidDecl(); 844 } 845 846 // The types match. Link up the redeclaration chain if the old 847 // declaration was a typedef. 848 // FIXME: this is a potential source of wierdness if the type 849 // spellings don't match exactly. 850 if (isa<TypedefDecl>(Old)) 851 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 852 853 if (getLangOptions().Microsoft) 854 return; 855 856 if (getLangOptions().CPlusPlus) { 857 // C++ [dcl.typedef]p2: 858 // In a given non-class scope, a typedef specifier can be used to 859 // redefine the name of any type declared in that scope to refer 860 // to the type to which it already refers. 861 if (!isa<CXXRecordDecl>(CurContext)) 862 return; 863 864 // C++0x [dcl.typedef]p4: 865 // In a given class scope, a typedef specifier can be used to redefine 866 // any class-name declared in that scope that is not also a typedef-name 867 // to refer to the type to which it already refers. 868 // 869 // This wording came in via DR424, which was a correction to the 870 // wording in DR56, which accidentally banned code like: 871 // 872 // struct S { 873 // typedef struct A { } A; 874 // }; 875 // 876 // in the C++03 standard. We implement the C++0x semantics, which 877 // allow the above but disallow 878 // 879 // struct S { 880 // typedef int I; 881 // typedef int I; 882 // }; 883 // 884 // since that was the intent of DR56. 885 if (!isa<TypedefDecl >(Old)) 886 return; 887 888 Diag(New->getLocation(), diag::err_redefinition) 889 << New->getDeclName(); 890 Diag(Old->getLocation(), diag::note_previous_definition); 891 return New->setInvalidDecl(); 892 } 893 894 // If we have a redefinition of a typedef in C, emit a warning. This warning 895 // is normally mapped to an error, but can be controlled with 896 // -Wtypedef-redefinition. If either the original or the redefinition is 897 // in a system header, don't emit this for compatibility with GCC. 898 if (getDiagnostics().getSuppressSystemWarnings() && 899 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 900 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 901 return; 902 903 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 904 << New->getDeclName(); 905 Diag(Old->getLocation(), diag::note_previous_definition); 906 return; 907} 908 909/// DeclhasAttr - returns true if decl Declaration already has the target 910/// attribute. 911static bool 912DeclHasAttr(const Decl *decl, const Attr *target) { 913 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 914 if (attr->getKind() == target->getKind()) 915 return true; 916 917 return false; 918} 919 920/// MergeAttributes - append attributes from the Old decl to the New one. 921static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 922 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 923 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 924 Attr *NewAttr = attr->clone(C); 925 NewAttr->setInherited(true); 926 New->addAttr(NewAttr); 927 } 928 } 929} 930 931/// Used in MergeFunctionDecl to keep track of function parameters in 932/// C. 933struct GNUCompatibleParamWarning { 934 ParmVarDecl *OldParm; 935 ParmVarDecl *NewParm; 936 QualType PromotedType; 937}; 938 939 940/// getSpecialMember - get the special member enum for a method. 941Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 942 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 943 if (Ctor->isCopyConstructor()) 944 return Sema::CXXCopyConstructor; 945 946 return Sema::CXXConstructor; 947 } 948 949 if (isa<CXXDestructorDecl>(MD)) 950 return Sema::CXXDestructor; 951 952 assert(MD->isCopyAssignment() && "Must have copy assignment operator"); 953 return Sema::CXXCopyAssignment; 954} 955 956/// canRedefineFunction - checks if a function can be redefined. Currently, 957/// only extern inline functions can be redefined, and even then only in 958/// GNU89 mode. 959static bool canRedefineFunction(const FunctionDecl *FD, 960 const LangOptions& LangOpts) { 961 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 962 FD->isInlineSpecified() && 963 FD->getStorageClass() == FunctionDecl::Extern); 964} 965 966/// MergeFunctionDecl - We just parsed a function 'New' from 967/// declarator D which has the same name and scope as a previous 968/// declaration 'Old'. Figure out how to resolve this situation, 969/// merging decls or emitting diagnostics as appropriate. 970/// 971/// In C++, New and Old must be declarations that are not 972/// overloaded. Use IsOverload to determine whether New and Old are 973/// overloaded, and to select the Old declaration that New should be 974/// merged with. 975/// 976/// Returns true if there was an error, false otherwise. 977bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 978 // Verify the old decl was also a function. 979 FunctionDecl *Old = 0; 980 if (FunctionTemplateDecl *OldFunctionTemplate 981 = dyn_cast<FunctionTemplateDecl>(OldD)) 982 Old = OldFunctionTemplate->getTemplatedDecl(); 983 else 984 Old = dyn_cast<FunctionDecl>(OldD); 985 if (!Old) { 986 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 987 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 988 Diag(Shadow->getTargetDecl()->getLocation(), 989 diag::note_using_decl_target); 990 Diag(Shadow->getUsingDecl()->getLocation(), 991 diag::note_using_decl) << 0; 992 return true; 993 } 994 995 Diag(New->getLocation(), diag::err_redefinition_different_kind) 996 << New->getDeclName(); 997 Diag(OldD->getLocation(), diag::note_previous_definition); 998 return true; 999 } 1000 1001 // Determine whether the previous declaration was a definition, 1002 // implicit declaration, or a declaration. 1003 diag::kind PrevDiag; 1004 if (Old->isThisDeclarationADefinition()) 1005 PrevDiag = diag::note_previous_definition; 1006 else if (Old->isImplicit()) 1007 PrevDiag = diag::note_previous_implicit_declaration; 1008 else 1009 PrevDiag = diag::note_previous_declaration; 1010 1011 QualType OldQType = Context.getCanonicalType(Old->getType()); 1012 QualType NewQType = Context.getCanonicalType(New->getType()); 1013 1014 // Don't complain about this if we're in GNU89 mode and the old function 1015 // is an extern inline function. 1016 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1017 New->getStorageClass() == FunctionDecl::Static && 1018 Old->getStorageClass() != FunctionDecl::Static && 1019 !canRedefineFunction(Old, getLangOptions())) { 1020 Diag(New->getLocation(), diag::err_static_non_static) 1021 << New; 1022 Diag(Old->getLocation(), PrevDiag); 1023 return true; 1024 } 1025 1026 // If a function is first declared with a calling convention, but is 1027 // later declared or defined without one, the second decl assumes the 1028 // calling convention of the first. 1029 // 1030 // For the new decl, we have to look at the NON-canonical type to tell the 1031 // difference between a function that really doesn't have a calling 1032 // convention and one that is declared cdecl. That's because in 1033 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1034 // because it is the default calling convention. 1035 // 1036 // Note also that we DO NOT return at this point, because we still have 1037 // other tests to run. 1038 const FunctionType *OldType = OldQType->getAs<FunctionType>(); 1039 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1040 const FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1041 const FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1042 if (OldTypeInfo.getCC() != CC_Default && 1043 NewTypeInfo.getCC() == CC_Default) { 1044 NewQType = Context.getCallConvType(NewQType, OldTypeInfo.getCC()); 1045 New->setType(NewQType); 1046 NewQType = Context.getCanonicalType(NewQType); 1047 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1048 NewTypeInfo.getCC())) { 1049 // Calling conventions really aren't compatible, so complain. 1050 Diag(New->getLocation(), diag::err_cconv_change) 1051 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1052 << (OldTypeInfo.getCC() == CC_Default) 1053 << (OldTypeInfo.getCC() == CC_Default ? "" : 1054 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1055 Diag(Old->getLocation(), diag::note_previous_declaration); 1056 return true; 1057 } 1058 1059 // FIXME: diagnose the other way around? 1060 if (OldType->getNoReturnAttr() && 1061 !NewType->getNoReturnAttr()) { 1062 NewQType = Context.getNoReturnType(NewQType); 1063 New->setType(NewQType); 1064 assert(NewQType.isCanonical()); 1065 } 1066 1067 if (getLangOptions().CPlusPlus) { 1068 // (C++98 13.1p2): 1069 // Certain function declarations cannot be overloaded: 1070 // -- Function declarations that differ only in the return type 1071 // cannot be overloaded. 1072 QualType OldReturnType 1073 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1074 QualType NewReturnType 1075 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1076 QualType ResQT; 1077 if (OldReturnType != NewReturnType) { 1078 if (NewReturnType->isObjCObjectPointerType() 1079 && OldReturnType->isObjCObjectPointerType()) 1080 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1081 if (ResQT.isNull()) { 1082 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1083 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1084 return true; 1085 } 1086 else 1087 NewQType = ResQT; 1088 } 1089 1090 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1091 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1092 if (OldMethod && NewMethod) { 1093 // Preserve triviality. 1094 NewMethod->setTrivial(OldMethod->isTrivial()); 1095 1096 bool isFriend = NewMethod->getFriendObjectKind(); 1097 1098 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) { 1099 // -- Member function declarations with the same name and the 1100 // same parameter types cannot be overloaded if any of them 1101 // is a static member function declaration. 1102 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1103 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1104 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1105 return true; 1106 } 1107 1108 // C++ [class.mem]p1: 1109 // [...] A member shall not be declared twice in the 1110 // member-specification, except that a nested class or member 1111 // class template can be declared and then later defined. 1112 unsigned NewDiag; 1113 if (isa<CXXConstructorDecl>(OldMethod)) 1114 NewDiag = diag::err_constructor_redeclared; 1115 else if (isa<CXXDestructorDecl>(NewMethod)) 1116 NewDiag = diag::err_destructor_redeclared; 1117 else if (isa<CXXConversionDecl>(NewMethod)) 1118 NewDiag = diag::err_conv_function_redeclared; 1119 else 1120 NewDiag = diag::err_member_redeclared; 1121 1122 Diag(New->getLocation(), NewDiag); 1123 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1124 1125 // Complain if this is an explicit declaration of a special 1126 // member that was initially declared implicitly. 1127 // 1128 // As an exception, it's okay to befriend such methods in order 1129 // to permit the implicit constructor/destructor/operator calls. 1130 } else if (OldMethod->isImplicit()) { 1131 if (isFriend) { 1132 NewMethod->setImplicit(); 1133 } else { 1134 Diag(NewMethod->getLocation(), 1135 diag::err_definition_of_implicitly_declared_member) 1136 << New << getSpecialMember(OldMethod); 1137 return true; 1138 } 1139 } 1140 } 1141 1142 // (C++98 8.3.5p3): 1143 // All declarations for a function shall agree exactly in both the 1144 // return type and the parameter-type-list. 1145 // attributes should be ignored when comparing. 1146 if (Context.getNoReturnType(OldQType, false) == 1147 Context.getNoReturnType(NewQType, false)) 1148 return MergeCompatibleFunctionDecls(New, Old); 1149 1150 // Fall through for conflicting redeclarations and redefinitions. 1151 } 1152 1153 // C: Function types need to be compatible, not identical. This handles 1154 // duplicate function decls like "void f(int); void f(enum X);" properly. 1155 if (!getLangOptions().CPlusPlus && 1156 Context.typesAreCompatible(OldQType, NewQType)) { 1157 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1158 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1159 const FunctionProtoType *OldProto = 0; 1160 if (isa<FunctionNoProtoType>(NewFuncType) && 1161 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1162 // The old declaration provided a function prototype, but the 1163 // new declaration does not. Merge in the prototype. 1164 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1165 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1166 OldProto->arg_type_end()); 1167 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1168 ParamTypes.data(), ParamTypes.size(), 1169 OldProto->isVariadic(), 1170 OldProto->getTypeQuals(), 1171 false, false, 0, 0, 1172 OldProto->getExtInfo()); 1173 New->setType(NewQType); 1174 New->setHasInheritedPrototype(); 1175 1176 // Synthesize a parameter for each argument type. 1177 llvm::SmallVector<ParmVarDecl*, 16> Params; 1178 for (FunctionProtoType::arg_type_iterator 1179 ParamType = OldProto->arg_type_begin(), 1180 ParamEnd = OldProto->arg_type_end(); 1181 ParamType != ParamEnd; ++ParamType) { 1182 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1183 SourceLocation(), 0, 1184 *ParamType, /*TInfo=*/0, 1185 VarDecl::None, VarDecl::None, 1186 0); 1187 Param->setImplicit(); 1188 Params.push_back(Param); 1189 } 1190 1191 New->setParams(Params.data(), Params.size()); 1192 } 1193 1194 return MergeCompatibleFunctionDecls(New, Old); 1195 } 1196 1197 // GNU C permits a K&R definition to follow a prototype declaration 1198 // if the declared types of the parameters in the K&R definition 1199 // match the types in the prototype declaration, even when the 1200 // promoted types of the parameters from the K&R definition differ 1201 // from the types in the prototype. GCC then keeps the types from 1202 // the prototype. 1203 // 1204 // If a variadic prototype is followed by a non-variadic K&R definition, 1205 // the K&R definition becomes variadic. This is sort of an edge case, but 1206 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1207 // C99 6.9.1p8. 1208 if (!getLangOptions().CPlusPlus && 1209 Old->hasPrototype() && !New->hasPrototype() && 1210 New->getType()->getAs<FunctionProtoType>() && 1211 Old->getNumParams() == New->getNumParams()) { 1212 llvm::SmallVector<QualType, 16> ArgTypes; 1213 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1214 const FunctionProtoType *OldProto 1215 = Old->getType()->getAs<FunctionProtoType>(); 1216 const FunctionProtoType *NewProto 1217 = New->getType()->getAs<FunctionProtoType>(); 1218 1219 // Determine whether this is the GNU C extension. 1220 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1221 NewProto->getResultType()); 1222 bool LooseCompatible = !MergedReturn.isNull(); 1223 for (unsigned Idx = 0, End = Old->getNumParams(); 1224 LooseCompatible && Idx != End; ++Idx) { 1225 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1226 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1227 if (Context.typesAreCompatible(OldParm->getType(), 1228 NewProto->getArgType(Idx))) { 1229 ArgTypes.push_back(NewParm->getType()); 1230 } else if (Context.typesAreCompatible(OldParm->getType(), 1231 NewParm->getType())) { 1232 GNUCompatibleParamWarning Warn 1233 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1234 Warnings.push_back(Warn); 1235 ArgTypes.push_back(NewParm->getType()); 1236 } else 1237 LooseCompatible = false; 1238 } 1239 1240 if (LooseCompatible) { 1241 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1242 Diag(Warnings[Warn].NewParm->getLocation(), 1243 diag::ext_param_promoted_not_compatible_with_prototype) 1244 << Warnings[Warn].PromotedType 1245 << Warnings[Warn].OldParm->getType(); 1246 Diag(Warnings[Warn].OldParm->getLocation(), 1247 diag::note_previous_declaration); 1248 } 1249 1250 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1251 ArgTypes.size(), 1252 OldProto->isVariadic(), 0, 1253 false, false, 0, 0, 1254 OldProto->getExtInfo())); 1255 return MergeCompatibleFunctionDecls(New, Old); 1256 } 1257 1258 // Fall through to diagnose conflicting types. 1259 } 1260 1261 // A function that has already been declared has been redeclared or defined 1262 // with a different type- show appropriate diagnostic 1263 if (unsigned BuiltinID = Old->getBuiltinID()) { 1264 // The user has declared a builtin function with an incompatible 1265 // signature. 1266 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1267 // The function the user is redeclaring is a library-defined 1268 // function like 'malloc' or 'printf'. Warn about the 1269 // redeclaration, then pretend that we don't know about this 1270 // library built-in. 1271 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1272 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1273 << Old << Old->getType(); 1274 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1275 Old->setInvalidDecl(); 1276 return false; 1277 } 1278 1279 PrevDiag = diag::note_previous_builtin_declaration; 1280 } 1281 1282 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1283 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1284 return true; 1285} 1286 1287/// \brief Completes the merge of two function declarations that are 1288/// known to be compatible. 1289/// 1290/// This routine handles the merging of attributes and other 1291/// properties of function declarations form the old declaration to 1292/// the new declaration, once we know that New is in fact a 1293/// redeclaration of Old. 1294/// 1295/// \returns false 1296bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1297 // Merge the attributes 1298 MergeAttributes(New, Old, Context); 1299 1300 // Merge the storage class. 1301 if (Old->getStorageClass() != FunctionDecl::Extern && 1302 Old->getStorageClass() != FunctionDecl::None) 1303 New->setStorageClass(Old->getStorageClass()); 1304 1305 // Merge "pure" flag. 1306 if (Old->isPure()) 1307 New->setPure(); 1308 1309 // Merge the "deleted" flag. 1310 if (Old->isDeleted()) 1311 New->setDeleted(); 1312 1313 if (getLangOptions().CPlusPlus) 1314 return MergeCXXFunctionDecl(New, Old); 1315 1316 return false; 1317} 1318 1319/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1320/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1321/// situation, merging decls or emitting diagnostics as appropriate. 1322/// 1323/// Tentative definition rules (C99 6.9.2p2) are checked by 1324/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1325/// definitions here, since the initializer hasn't been attached. 1326/// 1327void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1328 // If the new decl is already invalid, don't do any other checking. 1329 if (New->isInvalidDecl()) 1330 return; 1331 1332 // Verify the old decl was also a variable. 1333 VarDecl *Old = 0; 1334 if (!Previous.isSingleResult() || 1335 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1336 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1337 << New->getDeclName(); 1338 Diag(Previous.getRepresentativeDecl()->getLocation(), 1339 diag::note_previous_definition); 1340 return New->setInvalidDecl(); 1341 } 1342 1343 MergeAttributes(New, Old, Context); 1344 1345 // Merge the types 1346 QualType MergedT; 1347 if (getLangOptions().CPlusPlus) { 1348 if (Context.hasSameType(New->getType(), Old->getType())) 1349 MergedT = New->getType(); 1350 // C++ [basic.link]p10: 1351 // [...] the types specified by all declarations referring to a given 1352 // object or function shall be identical, except that declarations for an 1353 // array object can specify array types that differ by the presence or 1354 // absence of a major array bound (8.3.4). 1355 else if (Old->getType()->isIncompleteArrayType() && 1356 New->getType()->isArrayType()) { 1357 CanQual<ArrayType> OldArray 1358 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1359 CanQual<ArrayType> NewArray 1360 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1361 if (OldArray->getElementType() == NewArray->getElementType()) 1362 MergedT = New->getType(); 1363 } else if (Old->getType()->isArrayType() && 1364 New->getType()->isIncompleteArrayType()) { 1365 CanQual<ArrayType> OldArray 1366 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1367 CanQual<ArrayType> NewArray 1368 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1369 if (OldArray->getElementType() == NewArray->getElementType()) 1370 MergedT = Old->getType(); 1371 } else if (New->getType()->isObjCObjectPointerType() 1372 && Old->getType()->isObjCObjectPointerType()) { 1373 MergedT = Context.mergeObjCGCQualifiers(New->getType(), Old->getType()); 1374 } 1375 } else { 1376 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1377 } 1378 if (MergedT.isNull()) { 1379 Diag(New->getLocation(), diag::err_redefinition_different_type) 1380 << New->getDeclName(); 1381 Diag(Old->getLocation(), diag::note_previous_definition); 1382 return New->setInvalidDecl(); 1383 } 1384 New->setType(MergedT); 1385 1386 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1387 if (New->getStorageClass() == VarDecl::Static && 1388 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 1389 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1390 Diag(Old->getLocation(), diag::note_previous_definition); 1391 return New->setInvalidDecl(); 1392 } 1393 // C99 6.2.2p4: 1394 // For an identifier declared with the storage-class specifier 1395 // extern in a scope in which a prior declaration of that 1396 // identifier is visible,23) if the prior declaration specifies 1397 // internal or external linkage, the linkage of the identifier at 1398 // the later declaration is the same as the linkage specified at 1399 // the prior declaration. If no prior declaration is visible, or 1400 // if the prior declaration specifies no linkage, then the 1401 // identifier has external linkage. 1402 if (New->hasExternalStorage() && Old->hasLinkage()) 1403 /* Okay */; 1404 else if (New->getStorageClass() != VarDecl::Static && 1405 Old->getStorageClass() == VarDecl::Static) { 1406 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1407 Diag(Old->getLocation(), diag::note_previous_definition); 1408 return New->setInvalidDecl(); 1409 } 1410 1411 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1412 1413 // FIXME: The test for external storage here seems wrong? We still 1414 // need to check for mismatches. 1415 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1416 // Don't complain about out-of-line definitions of static members. 1417 !(Old->getLexicalDeclContext()->isRecord() && 1418 !New->getLexicalDeclContext()->isRecord())) { 1419 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1420 Diag(Old->getLocation(), diag::note_previous_definition); 1421 return New->setInvalidDecl(); 1422 } 1423 1424 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1425 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1426 Diag(Old->getLocation(), diag::note_previous_definition); 1427 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1428 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1429 Diag(Old->getLocation(), diag::note_previous_definition); 1430 } 1431 1432 // C++ doesn't have tentative definitions, so go right ahead and check here. 1433 const VarDecl *Def; 1434 if (getLangOptions().CPlusPlus && 1435 New->isThisDeclarationADefinition() == VarDecl::Definition && 1436 (Def = Old->getDefinition())) { 1437 Diag(New->getLocation(), diag::err_redefinition) 1438 << New->getDeclName(); 1439 Diag(Def->getLocation(), diag::note_previous_definition); 1440 New->setInvalidDecl(); 1441 return; 1442 } 1443 1444 // Keep a chain of previous declarations. 1445 New->setPreviousDeclaration(Old); 1446 1447 // Inherit access appropriately. 1448 New->setAccess(Old->getAccess()); 1449} 1450 1451/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1452/// no declarator (e.g. "struct foo;") is parsed. 1453Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 1454 DeclSpec &DS) { 1455 // FIXME: Error on auto/register at file scope 1456 // FIXME: Error on inline/virtual/explicit 1457 // FIXME: Warn on useless __thread 1458 // FIXME: Warn on useless const/volatile 1459 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1460 // FIXME: Warn on useless attributes 1461 Decl *TagD = 0; 1462 TagDecl *Tag = 0; 1463 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1464 DS.getTypeSpecType() == DeclSpec::TST_struct || 1465 DS.getTypeSpecType() == DeclSpec::TST_union || 1466 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1467 TagD = static_cast<Decl *>(DS.getTypeRep()); 1468 1469 if (!TagD) // We probably had an error 1470 return DeclPtrTy(); 1471 1472 // Note that the above type specs guarantee that the 1473 // type rep is a Decl, whereas in many of the others 1474 // it's a Type. 1475 Tag = dyn_cast<TagDecl>(TagD); 1476 } 1477 1478 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1479 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1480 // or incomplete types shall not be restrict-qualified." 1481 if (TypeQuals & DeclSpec::TQ_restrict) 1482 Diag(DS.getRestrictSpecLoc(), 1483 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1484 << DS.getSourceRange(); 1485 } 1486 1487 if (DS.isFriendSpecified()) { 1488 // If we're dealing with a class template decl, assume that the 1489 // template routines are handling it. 1490 if (TagD && isa<ClassTemplateDecl>(TagD)) 1491 return DeclPtrTy(); 1492 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1493 } 1494 1495 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1496 // If there are attributes in the DeclSpec, apply them to the record. 1497 if (const AttributeList *AL = DS.getAttributes()) 1498 ProcessDeclAttributeList(S, Record, AL); 1499 1500 if (!Record->getDeclName() && Record->isDefinition() && 1501 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1502 if (getLangOptions().CPlusPlus || 1503 Record->getDeclContext()->isRecord()) 1504 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 1505 1506 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1507 << DS.getSourceRange(); 1508 } 1509 1510 // Microsoft allows unnamed struct/union fields. Don't complain 1511 // about them. 1512 // FIXME: Should we support Microsoft's extensions in this area? 1513 if (Record->getDeclName() && getLangOptions().Microsoft) 1514 return DeclPtrTy::make(Tag); 1515 } 1516 1517 if (!DS.isMissingDeclaratorOk() && 1518 DS.getTypeSpecType() != DeclSpec::TST_error) { 1519 // Warn about typedefs of enums without names, since this is an 1520 // extension in both Microsoft an GNU. 1521 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1522 Tag && isa<EnumDecl>(Tag)) { 1523 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1524 << DS.getSourceRange(); 1525 return DeclPtrTy::make(Tag); 1526 } 1527 1528 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1529 << DS.getSourceRange(); 1530 } 1531 1532 return DeclPtrTy::make(Tag); 1533} 1534 1535/// We are trying to inject an anonymous member into the given scope; 1536/// check if there's an existing declaration that can't be overloaded. 1537/// 1538/// \return true if this is a forbidden redeclaration 1539static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1540 Scope *S, 1541 DeclContext *Owner, 1542 DeclarationName Name, 1543 SourceLocation NameLoc, 1544 unsigned diagnostic) { 1545 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1546 Sema::ForRedeclaration); 1547 if (!SemaRef.LookupName(R, S)) return false; 1548 1549 if (R.getAsSingle<TagDecl>()) 1550 return false; 1551 1552 // Pick a representative declaration. 1553 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1554 if (PrevDecl && Owner->isRecord()) { 1555 RecordDecl *Record = cast<RecordDecl>(Owner); 1556 if (!SemaRef.isDeclInScope(PrevDecl, Record, S)) 1557 return false; 1558 } 1559 1560 SemaRef.Diag(NameLoc, diagnostic) << Name; 1561 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1562 1563 return true; 1564} 1565 1566/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1567/// anonymous struct or union AnonRecord into the owning context Owner 1568/// and scope S. This routine will be invoked just after we realize 1569/// that an unnamed union or struct is actually an anonymous union or 1570/// struct, e.g., 1571/// 1572/// @code 1573/// union { 1574/// int i; 1575/// float f; 1576/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1577/// // f into the surrounding scope.x 1578/// @endcode 1579/// 1580/// This routine is recursive, injecting the names of nested anonymous 1581/// structs/unions into the owning context and scope as well. 1582static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 1583 DeclContext *Owner, 1584 RecordDecl *AnonRecord, 1585 AccessSpecifier AS) { 1586 unsigned diagKind 1587 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1588 : diag::err_anonymous_struct_member_redecl; 1589 1590 bool Invalid = false; 1591 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1592 FEnd = AnonRecord->field_end(); 1593 F != FEnd; ++F) { 1594 if ((*F)->getDeclName()) { 1595 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, (*F)->getDeclName(), 1596 (*F)->getLocation(), diagKind)) { 1597 // C++ [class.union]p2: 1598 // The names of the members of an anonymous union shall be 1599 // distinct from the names of any other entity in the 1600 // scope in which the anonymous union is declared. 1601 Invalid = true; 1602 } else { 1603 // C++ [class.union]p2: 1604 // For the purpose of name lookup, after the anonymous union 1605 // definition, the members of the anonymous union are 1606 // considered to have been defined in the scope in which the 1607 // anonymous union is declared. 1608 Owner->makeDeclVisibleInContext(*F); 1609 S->AddDecl(Sema::DeclPtrTy::make(*F)); 1610 SemaRef.IdResolver.AddDecl(*F); 1611 1612 // That includes picking up the appropriate access specifier. 1613 if (AS != AS_none) (*F)->setAccess(AS); 1614 } 1615 } else if (const RecordType *InnerRecordType 1616 = (*F)->getType()->getAs<RecordType>()) { 1617 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1618 if (InnerRecord->isAnonymousStructOrUnion()) 1619 Invalid = Invalid || 1620 InjectAnonymousStructOrUnionMembers(SemaRef, S, Owner, 1621 InnerRecord, AS); 1622 } 1623 } 1624 1625 return Invalid; 1626} 1627 1628/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 1629/// a VarDecl::StorageClass. Any error reporting is up to the caller: 1630/// illegal input values are mapped to VarDecl::None. 1631/// If the input declaration context is a linkage specification 1632/// with no braces, then Extern is mapped to None. 1633static VarDecl::StorageClass 1634StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec, 1635 DeclContext *DC) { 1636 switch (StorageClassSpec) { 1637 case DeclSpec::SCS_unspecified: return VarDecl::None; 1638 case DeclSpec::SCS_extern: 1639 // If the current context is a C++ linkage specification 1640 // having no braces, then the keyword "extern" is properly part 1641 // of the linkage specification itself, rather than being 1642 // the written storage class specifier. 1643 return (DC && isa<LinkageSpecDecl>(DC) && 1644 !cast<LinkageSpecDecl>(DC)->hasBraces()) 1645 ? VarDecl::None : VarDecl::Extern; 1646 case DeclSpec::SCS_static: return VarDecl::Static; 1647 case DeclSpec::SCS_auto: return VarDecl::Auto; 1648 case DeclSpec::SCS_register: return VarDecl::Register; 1649 case DeclSpec::SCS_private_extern: return VarDecl::PrivateExtern; 1650 // Illegal SCSs map to None: error reporting is up to the caller. 1651 case DeclSpec::SCS_mutable: // Fall through. 1652 case DeclSpec::SCS_typedef: return VarDecl::None; 1653 } 1654 llvm_unreachable("unknown storage class specifier"); 1655} 1656 1657/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 1658/// a FunctionDecl::StorageClass. Any error reporting is up to the caller: 1659/// illegal input values are mapped to FunctionDecl::None. 1660/// If the input declaration context is a linkage specification 1661/// with no braces, then Extern is mapped to None. 1662static FunctionDecl::StorageClass 1663StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec, 1664 DeclContext *DC) { 1665 switch (StorageClassSpec) { 1666 case DeclSpec::SCS_unspecified: return FunctionDecl::None; 1667 case DeclSpec::SCS_extern: 1668 // If the current context is a C++ linkage specification 1669 // having no braces, then the keyword "extern" is properly part 1670 // of the linkage specification itself, rather than being 1671 // the written storage class specifier. 1672 return (DC && isa<LinkageSpecDecl>(DC) && 1673 !cast<LinkageSpecDecl>(DC)->hasBraces()) 1674 ? FunctionDecl::None : FunctionDecl::Extern; 1675 case DeclSpec::SCS_static: return FunctionDecl::Static; 1676 case DeclSpec::SCS_private_extern: return FunctionDecl::PrivateExtern; 1677 // Illegal SCSs map to None: error reporting is up to the caller. 1678 case DeclSpec::SCS_auto: // Fall through. 1679 case DeclSpec::SCS_mutable: // Fall through. 1680 case DeclSpec::SCS_register: // Fall through. 1681 case DeclSpec::SCS_typedef: return FunctionDecl::None; 1682 } 1683 llvm_unreachable("unknown storage class specifier"); 1684} 1685 1686/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1687/// anonymous structure or union. Anonymous unions are a C++ feature 1688/// (C++ [class.union]) and a GNU C extension; anonymous structures 1689/// are a GNU C and GNU C++ extension. 1690Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1691 AccessSpecifier AS, 1692 RecordDecl *Record) { 1693 DeclContext *Owner = Record->getDeclContext(); 1694 1695 // Diagnose whether this anonymous struct/union is an extension. 1696 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1697 Diag(Record->getLocation(), diag::ext_anonymous_union); 1698 else if (!Record->isUnion()) 1699 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1700 1701 // C and C++ require different kinds of checks for anonymous 1702 // structs/unions. 1703 bool Invalid = false; 1704 if (getLangOptions().CPlusPlus) { 1705 const char* PrevSpec = 0; 1706 unsigned DiagID; 1707 // C++ [class.union]p3: 1708 // Anonymous unions declared in a named namespace or in the 1709 // global namespace shall be declared static. 1710 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1711 (isa<TranslationUnitDecl>(Owner) || 1712 (isa<NamespaceDecl>(Owner) && 1713 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1714 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1715 Invalid = true; 1716 1717 // Recover by adding 'static'. 1718 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1719 PrevSpec, DiagID); 1720 } 1721 // C++ [class.union]p3: 1722 // A storage class is not allowed in a declaration of an 1723 // anonymous union in a class scope. 1724 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1725 isa<RecordDecl>(Owner)) { 1726 Diag(DS.getStorageClassSpecLoc(), 1727 diag::err_anonymous_union_with_storage_spec); 1728 Invalid = true; 1729 1730 // Recover by removing the storage specifier. 1731 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1732 PrevSpec, DiagID); 1733 } 1734 1735 // C++ [class.union]p2: 1736 // The member-specification of an anonymous union shall only 1737 // define non-static data members. [Note: nested types and 1738 // functions cannot be declared within an anonymous union. ] 1739 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1740 MemEnd = Record->decls_end(); 1741 Mem != MemEnd; ++Mem) { 1742 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1743 // C++ [class.union]p3: 1744 // An anonymous union shall not have private or protected 1745 // members (clause 11). 1746 assert(FD->getAccess() != AS_none); 1747 if (FD->getAccess() != AS_public) { 1748 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1749 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1750 Invalid = true; 1751 } 1752 } else if ((*Mem)->isImplicit()) { 1753 // Any implicit members are fine. 1754 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1755 // This is a type that showed up in an 1756 // elaborated-type-specifier inside the anonymous struct or 1757 // union, but which actually declares a type outside of the 1758 // anonymous struct or union. It's okay. 1759 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1760 if (!MemRecord->isAnonymousStructOrUnion() && 1761 MemRecord->getDeclName()) { 1762 // This is a nested type declaration. 1763 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1764 << (int)Record->isUnion(); 1765 Invalid = true; 1766 } 1767 } else if (isa<AccessSpecDecl>(*Mem)) { 1768 // Any access specifier is fine. 1769 } else { 1770 // We have something that isn't a non-static data 1771 // member. Complain about it. 1772 unsigned DK = diag::err_anonymous_record_bad_member; 1773 if (isa<TypeDecl>(*Mem)) 1774 DK = diag::err_anonymous_record_with_type; 1775 else if (isa<FunctionDecl>(*Mem)) 1776 DK = diag::err_anonymous_record_with_function; 1777 else if (isa<VarDecl>(*Mem)) 1778 DK = diag::err_anonymous_record_with_static; 1779 Diag((*Mem)->getLocation(), DK) 1780 << (int)Record->isUnion(); 1781 Invalid = true; 1782 } 1783 } 1784 } 1785 1786 if (!Record->isUnion() && !Owner->isRecord()) { 1787 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1788 << (int)getLangOptions().CPlusPlus; 1789 Invalid = true; 1790 } 1791 1792 // Mock up a declarator. 1793 Declarator Dc(DS, Declarator::TypeNameContext); 1794 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 1795 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1796 1797 // Create a declaration for this anonymous struct/union. 1798 NamedDecl *Anon = 0; 1799 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1800 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1801 /*IdentifierInfo=*/0, 1802 Context.getTypeDeclType(Record), 1803 TInfo, 1804 /*BitWidth=*/0, /*Mutable=*/false); 1805 Anon->setAccess(AS); 1806 if (getLangOptions().CPlusPlus) { 1807 FieldCollector->Add(cast<FieldDecl>(Anon)); 1808 if (!cast<CXXRecordDecl>(Record)->isEmpty()) 1809 cast<CXXRecordDecl>(OwningClass)->setEmpty(false); 1810 } 1811 } else { 1812 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 1813 assert(SCSpec != DeclSpec::SCS_typedef && 1814 "Parser allowed 'typedef' as storage class VarDecl."); 1815 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec, 0); 1816 if (SCSpec == DeclSpec::SCS_mutable) { 1817 // mutable can only appear on non-static class members, so it's always 1818 // an error here 1819 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1820 Invalid = true; 1821 SC = VarDecl::None; 1822 } 1823 SCSpec = DS.getStorageClassSpecAsWritten(); 1824 VarDecl::StorageClass SCAsWritten 1825 = StorageClassSpecToVarDeclStorageClass(SCSpec, 0); 1826 1827 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1828 /*IdentifierInfo=*/0, 1829 Context.getTypeDeclType(Record), 1830 TInfo, SC, SCAsWritten); 1831 } 1832 Anon->setImplicit(); 1833 1834 // Add the anonymous struct/union object to the current 1835 // context. We'll be referencing this object when we refer to one of 1836 // its members. 1837 Owner->addDecl(Anon); 1838 1839 // Inject the members of the anonymous struct/union into the owning 1840 // context and into the identifier resolver chain for name lookup 1841 // purposes. 1842 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS)) 1843 Invalid = true; 1844 1845 // Mark this as an anonymous struct/union type. Note that we do not 1846 // do this until after we have already checked and injected the 1847 // members of this anonymous struct/union type, because otherwise 1848 // the members could be injected twice: once by DeclContext when it 1849 // builds its lookup table, and once by 1850 // InjectAnonymousStructOrUnionMembers. 1851 Record->setAnonymousStructOrUnion(true); 1852 1853 if (Invalid) 1854 Anon->setInvalidDecl(); 1855 1856 return DeclPtrTy::make(Anon); 1857} 1858 1859 1860/// GetNameForDeclarator - Determine the full declaration name for the 1861/// given Declarator. 1862DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1863 return GetNameFromUnqualifiedId(D.getName()); 1864} 1865 1866/// \brief Retrieves the canonicalized name from a parsed unqualified-id. 1867DeclarationName Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 1868 switch (Name.getKind()) { 1869 case UnqualifiedId::IK_Identifier: 1870 return DeclarationName(Name.Identifier); 1871 1872 case UnqualifiedId::IK_OperatorFunctionId: 1873 return Context.DeclarationNames.getCXXOperatorName( 1874 Name.OperatorFunctionId.Operator); 1875 1876 case UnqualifiedId::IK_LiteralOperatorId: 1877 return Context.DeclarationNames.getCXXLiteralOperatorName( 1878 Name.Identifier); 1879 1880 case UnqualifiedId::IK_ConversionFunctionId: { 1881 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId); 1882 if (Ty.isNull()) 1883 return DeclarationName(); 1884 1885 return Context.DeclarationNames.getCXXConversionFunctionName( 1886 Context.getCanonicalType(Ty)); 1887 } 1888 1889 case UnqualifiedId::IK_ConstructorName: { 1890 QualType Ty = GetTypeFromParser(Name.ConstructorName); 1891 if (Ty.isNull()) 1892 return DeclarationName(); 1893 1894 return Context.DeclarationNames.getCXXConstructorName( 1895 Context.getCanonicalType(Ty)); 1896 } 1897 1898 case UnqualifiedId::IK_ConstructorTemplateId: { 1899 // In well-formed code, we can only have a constructor 1900 // template-id that refers to the current context, so go there 1901 // to find the actual type being constructed. 1902 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 1903 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 1904 return DeclarationName(); 1905 1906 // Determine the type of the class being constructed. 1907 QualType CurClassType = Context.getTypeDeclType(CurClass); 1908 1909 // FIXME: Check two things: that the template-id names the same type as 1910 // CurClassType, and that the template-id does not occur when the name 1911 // was qualified. 1912 1913 return Context.DeclarationNames.getCXXConstructorName( 1914 Context.getCanonicalType(CurClassType)); 1915 } 1916 1917 case UnqualifiedId::IK_DestructorName: { 1918 QualType Ty = GetTypeFromParser(Name.DestructorName); 1919 if (Ty.isNull()) 1920 return DeclarationName(); 1921 1922 return Context.DeclarationNames.getCXXDestructorName( 1923 Context.getCanonicalType(Ty)); 1924 } 1925 1926 case UnqualifiedId::IK_TemplateId: { 1927 TemplateName TName 1928 = TemplateName::getFromVoidPointer(Name.TemplateId->Template); 1929 return Context.getNameForTemplate(TName); 1930 } 1931 } 1932 1933 assert(false && "Unknown name kind"); 1934 return DeclarationName(); 1935} 1936 1937/// isNearlyMatchingFunction - Determine whether the C++ functions 1938/// Declaration and Definition are "nearly" matching. This heuristic 1939/// is used to improve diagnostics in the case where an out-of-line 1940/// function definition doesn't match any declaration within 1941/// the class or namespace. 1942static bool isNearlyMatchingFunction(ASTContext &Context, 1943 FunctionDecl *Declaration, 1944 FunctionDecl *Definition) { 1945 if (Declaration->param_size() != Definition->param_size()) 1946 return false; 1947 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1948 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1949 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1950 1951 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 1952 DefParamTy.getNonReferenceType())) 1953 return false; 1954 } 1955 1956 return true; 1957} 1958 1959/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 1960/// declarator needs to be rebuilt in the current instantiation. 1961/// Any bits of declarator which appear before the name are valid for 1962/// consideration here. That's specifically the type in the decl spec 1963/// and the base type in any member-pointer chunks. 1964static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 1965 DeclarationName Name) { 1966 // The types we specifically need to rebuild are: 1967 // - typenames, typeofs, and decltypes 1968 // - types which will become injected class names 1969 // Of course, we also need to rebuild any type referencing such a 1970 // type. It's safest to just say "dependent", but we call out a 1971 // few cases here. 1972 1973 DeclSpec &DS = D.getMutableDeclSpec(); 1974 switch (DS.getTypeSpecType()) { 1975 case DeclSpec::TST_typename: 1976 case DeclSpec::TST_typeofType: 1977 case DeclSpec::TST_typeofExpr: 1978 case DeclSpec::TST_decltype: { 1979 // Grab the type from the parser. 1980 TypeSourceInfo *TSI = 0; 1981 QualType T = S.GetTypeFromParser(DS.getTypeRep(), &TSI); 1982 if (T.isNull() || !T->isDependentType()) break; 1983 1984 // Make sure there's a type source info. This isn't really much 1985 // of a waste; most dependent types should have type source info 1986 // attached already. 1987 if (!TSI) 1988 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 1989 1990 // Rebuild the type in the current instantiation. 1991 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 1992 if (!TSI) return true; 1993 1994 // Store the new type back in the decl spec. 1995 QualType LocType = S.CreateLocInfoType(TSI->getType(), TSI); 1996 DS.UpdateTypeRep(LocType.getAsOpaquePtr()); 1997 break; 1998 } 1999 2000 default: 2001 // Nothing to do for these decl specs. 2002 break; 2003 } 2004 2005 // It doesn't matter what order we do this in. 2006 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2007 DeclaratorChunk &Chunk = D.getTypeObject(I); 2008 2009 // The only type information in the declarator which can come 2010 // before the declaration name is the base type of a member 2011 // pointer. 2012 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2013 continue; 2014 2015 // Rebuild the scope specifier in-place. 2016 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2017 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2018 return true; 2019 } 2020 2021 return false; 2022} 2023 2024Sema::DeclPtrTy 2025Sema::HandleDeclarator(Scope *S, Declarator &D, 2026 MultiTemplateParamsArg TemplateParamLists, 2027 bool IsFunctionDefinition) { 2028 DeclarationName Name = GetNameForDeclarator(D); 2029 2030 // All of these full declarators require an identifier. If it doesn't have 2031 // one, the ParsedFreeStandingDeclSpec action should be used. 2032 if (!Name) { 2033 if (!D.isInvalidType()) // Reject this if we think it is valid. 2034 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2035 diag::err_declarator_need_ident) 2036 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2037 return DeclPtrTy(); 2038 } 2039 2040 // The scope passed in may not be a decl scope. Zip up the scope tree until 2041 // we find one that is. 2042 while ((S->getFlags() & Scope::DeclScope) == 0 || 2043 (S->getFlags() & Scope::TemplateParamScope) != 0) 2044 S = S->getParent(); 2045 2046 DeclContext *DC = CurContext; 2047 if (D.getCXXScopeSpec().isInvalid()) 2048 D.setInvalidType(); 2049 else if (D.getCXXScopeSpec().isSet()) { 2050 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2051 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2052 if (!DC) { 2053 // If we could not compute the declaration context, it's because the 2054 // declaration context is dependent but does not refer to a class, 2055 // class template, or class template partial specialization. Complain 2056 // and return early, to avoid the coming semantic disaster. 2057 Diag(D.getIdentifierLoc(), 2058 diag::err_template_qualified_declarator_no_match) 2059 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2060 << D.getCXXScopeSpec().getRange(); 2061 return DeclPtrTy(); 2062 } 2063 2064 bool IsDependentContext = DC->isDependentContext(); 2065 2066 if (!IsDependentContext && 2067 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2068 return DeclPtrTy(); 2069 2070 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 2071 Diag(D.getIdentifierLoc(), 2072 diag::err_member_def_undefined_record) 2073 << Name << DC << D.getCXXScopeSpec().getRange(); 2074 D.setInvalidType(); 2075 } 2076 2077 // Check whether we need to rebuild the type of the given 2078 // declaration in the current instantiation. 2079 if (EnteringContext && IsDependentContext && 2080 TemplateParamLists.size() != 0) { 2081 ContextRAII SavedContext(*this, DC); 2082 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 2083 D.setInvalidType(); 2084 } 2085 } 2086 2087 NamedDecl *New; 2088 2089 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 2090 QualType R = TInfo->getType(); 2091 2092 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 2093 ForRedeclaration); 2094 2095 // See if this is a redefinition of a variable in the same scope. 2096 if (!D.getCXXScopeSpec().isSet()) { 2097 bool IsLinkageLookup = false; 2098 2099 // If the declaration we're planning to build will be a function 2100 // or object with linkage, then look for another declaration with 2101 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 2102 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2103 /* Do nothing*/; 2104 else if (R->isFunctionType()) { 2105 if (CurContext->isFunctionOrMethod() || 2106 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2107 IsLinkageLookup = true; 2108 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 2109 IsLinkageLookup = true; 2110 else if (CurContext->getLookupContext()->isTranslationUnit() && 2111 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2112 IsLinkageLookup = true; 2113 2114 if (IsLinkageLookup) 2115 Previous.clear(LookupRedeclarationWithLinkage); 2116 2117 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 2118 } else { // Something like "int foo::x;" 2119 LookupQualifiedName(Previous, DC); 2120 2121 // Don't consider using declarations as previous declarations for 2122 // out-of-line members. 2123 RemoveUsingDecls(Previous); 2124 2125 // C++ 7.3.1.2p2: 2126 // Members (including explicit specializations of templates) of a named 2127 // namespace can also be defined outside that namespace by explicit 2128 // qualification of the name being defined, provided that the entity being 2129 // defined was already declared in the namespace and the definition appears 2130 // after the point of declaration in a namespace that encloses the 2131 // declarations namespace. 2132 // 2133 // Note that we only check the context at this point. We don't yet 2134 // have enough information to make sure that PrevDecl is actually 2135 // the declaration we want to match. For example, given: 2136 // 2137 // class X { 2138 // void f(); 2139 // void f(float); 2140 // }; 2141 // 2142 // void X::f(int) { } // ill-formed 2143 // 2144 // In this case, PrevDecl will point to the overload set 2145 // containing the two f's declared in X, but neither of them 2146 // matches. 2147 2148 // First check whether we named the global scope. 2149 if (isa<TranslationUnitDecl>(DC)) { 2150 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 2151 << Name << D.getCXXScopeSpec().getRange(); 2152 } else { 2153 DeclContext *Cur = CurContext; 2154 while (isa<LinkageSpecDecl>(Cur)) 2155 Cur = Cur->getParent(); 2156 if (!Cur->Encloses(DC)) { 2157 // The qualifying scope doesn't enclose the original declaration. 2158 // Emit diagnostic based on current scope. 2159 SourceLocation L = D.getIdentifierLoc(); 2160 SourceRange R = D.getCXXScopeSpec().getRange(); 2161 if (isa<FunctionDecl>(Cur)) 2162 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 2163 else 2164 Diag(L, diag::err_invalid_declarator_scope) 2165 << Name << cast<NamedDecl>(DC) << R; 2166 D.setInvalidType(); 2167 } 2168 } 2169 } 2170 2171 if (Previous.isSingleResult() && 2172 Previous.getFoundDecl()->isTemplateParameter()) { 2173 // Maybe we will complain about the shadowed template parameter. 2174 if (!D.isInvalidType()) 2175 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2176 Previous.getFoundDecl())) 2177 D.setInvalidType(); 2178 2179 // Just pretend that we didn't see the previous declaration. 2180 Previous.clear(); 2181 } 2182 2183 // In C++, the previous declaration we find might be a tag type 2184 // (class or enum). In this case, the new declaration will hide the 2185 // tag type. Note that this does does not apply if we're declaring a 2186 // typedef (C++ [dcl.typedef]p4). 2187 if (Previous.isSingleTagDecl() && 2188 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2189 Previous.clear(); 2190 2191 bool Redeclaration = false; 2192 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2193 if (TemplateParamLists.size()) { 2194 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2195 return DeclPtrTy(); 2196 } 2197 2198 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2199 } else if (R->isFunctionType()) { 2200 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2201 move(TemplateParamLists), 2202 IsFunctionDefinition, Redeclaration); 2203 } else { 2204 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2205 move(TemplateParamLists), 2206 Redeclaration); 2207 } 2208 2209 if (New == 0) 2210 return DeclPtrTy(); 2211 2212 // If this has an identifier and is not an invalid redeclaration or 2213 // function template specialization, add it to the scope stack. 2214 if (Name && !(Redeclaration && New->isInvalidDecl())) 2215 PushOnScopeChains(New, S); 2216 2217 return DeclPtrTy::make(New); 2218} 2219 2220/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2221/// types into constant array types in certain situations which would otherwise 2222/// be errors (for GCC compatibility). 2223static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2224 ASTContext &Context, 2225 bool &SizeIsNegative) { 2226 // This method tries to turn a variable array into a constant 2227 // array even when the size isn't an ICE. This is necessary 2228 // for compatibility with code that depends on gcc's buggy 2229 // constant expression folding, like struct {char x[(int)(char*)2];} 2230 SizeIsNegative = false; 2231 2232 QualifierCollector Qs; 2233 const Type *Ty = Qs.strip(T); 2234 2235 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2236 QualType Pointee = PTy->getPointeeType(); 2237 QualType FixedType = 2238 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 2239 if (FixedType.isNull()) return FixedType; 2240 FixedType = Context.getPointerType(FixedType); 2241 return Qs.apply(FixedType); 2242 } 2243 2244 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2245 if (!VLATy) 2246 return QualType(); 2247 // FIXME: We should probably handle this case 2248 if (VLATy->getElementType()->isVariablyModifiedType()) 2249 return QualType(); 2250 2251 Expr::EvalResult EvalResult; 2252 if (!VLATy->getSizeExpr() || 2253 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2254 !EvalResult.Val.isInt()) 2255 return QualType(); 2256 2257 llvm::APSInt &Res = EvalResult.Val.getInt(); 2258 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 2259 // TODO: preserve the size expression in declarator info 2260 return Context.getConstantArrayType(VLATy->getElementType(), 2261 Res, ArrayType::Normal, 0); 2262 } 2263 2264 SizeIsNegative = true; 2265 return QualType(); 2266} 2267 2268/// \brief Register the given locally-scoped external C declaration so 2269/// that it can be found later for redeclarations 2270void 2271Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2272 const LookupResult &Previous, 2273 Scope *S) { 2274 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2275 "Decl is not a locally-scoped decl!"); 2276 // Note that we have a locally-scoped external with this name. 2277 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2278 2279 if (!Previous.isSingleResult()) 2280 return; 2281 2282 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2283 2284 // If there was a previous declaration of this variable, it may be 2285 // in our identifier chain. Update the identifier chain with the new 2286 // declaration. 2287 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2288 // The previous declaration was found on the identifer resolver 2289 // chain, so remove it from its scope. 2290 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 2291 S = S->getParent(); 2292 2293 if (S) 2294 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 2295 } 2296} 2297 2298/// \brief Diagnose function specifiers on a declaration of an identifier that 2299/// does not identify a function. 2300void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2301 // FIXME: We should probably indicate the identifier in question to avoid 2302 // confusion for constructs like "inline int a(), b;" 2303 if (D.getDeclSpec().isInlineSpecified()) 2304 Diag(D.getDeclSpec().getInlineSpecLoc(), 2305 diag::err_inline_non_function); 2306 2307 if (D.getDeclSpec().isVirtualSpecified()) 2308 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2309 diag::err_virtual_non_function); 2310 2311 if (D.getDeclSpec().isExplicitSpecified()) 2312 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2313 diag::err_explicit_non_function); 2314} 2315 2316NamedDecl* 2317Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2318 QualType R, TypeSourceInfo *TInfo, 2319 LookupResult &Previous, bool &Redeclaration) { 2320 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2321 if (D.getCXXScopeSpec().isSet()) { 2322 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2323 << D.getCXXScopeSpec().getRange(); 2324 D.setInvalidType(); 2325 // Pretend we didn't see the scope specifier. 2326 DC = CurContext; 2327 Previous.clear(); 2328 } 2329 2330 if (getLangOptions().CPlusPlus) { 2331 // Check that there are no default arguments (C++ only). 2332 CheckExtraCXXDefaultArguments(D); 2333 } 2334 2335 DiagnoseFunctionSpecifiers(D); 2336 2337 if (D.getDeclSpec().isThreadSpecified()) 2338 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2339 2340 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2341 if (!NewTD) return 0; 2342 2343 // Handle attributes prior to checking for duplicates in MergeVarDecl 2344 ProcessDeclAttributes(S, NewTD, D); 2345 2346 // Merge the decl with the existing one if appropriate. If the decl is 2347 // in an outer scope, it isn't the same thing. 2348 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2349 if (!Previous.empty()) { 2350 Redeclaration = true; 2351 MergeTypeDefDecl(NewTD, Previous); 2352 } 2353 2354 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2355 // then it shall have block scope. 2356 QualType T = NewTD->getUnderlyingType(); 2357 if (T->isVariablyModifiedType()) { 2358 FunctionNeedsScopeChecking() = true; 2359 2360 if (S->getFnParent() == 0) { 2361 bool SizeIsNegative; 2362 QualType FixedTy = 2363 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2364 if (!FixedTy.isNull()) { 2365 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2366 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2367 } else { 2368 if (SizeIsNegative) 2369 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2370 else if (T->isVariableArrayType()) 2371 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2372 else 2373 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2374 NewTD->setInvalidDecl(); 2375 } 2376 } 2377 } 2378 2379 // If this is the C FILE type, notify the AST context. 2380 if (IdentifierInfo *II = NewTD->getIdentifier()) 2381 if (!NewTD->isInvalidDecl() && 2382 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 2383 if (II->isStr("FILE")) 2384 Context.setFILEDecl(NewTD); 2385 else if (II->isStr("jmp_buf")) 2386 Context.setjmp_bufDecl(NewTD); 2387 else if (II->isStr("sigjmp_buf")) 2388 Context.setsigjmp_bufDecl(NewTD); 2389 } 2390 2391 return NewTD; 2392} 2393 2394/// \brief Determines whether the given declaration is an out-of-scope 2395/// previous declaration. 2396/// 2397/// This routine should be invoked when name lookup has found a 2398/// previous declaration (PrevDecl) that is not in the scope where a 2399/// new declaration by the same name is being introduced. If the new 2400/// declaration occurs in a local scope, previous declarations with 2401/// linkage may still be considered previous declarations (C99 2402/// 6.2.2p4-5, C++ [basic.link]p6). 2403/// 2404/// \param PrevDecl the previous declaration found by name 2405/// lookup 2406/// 2407/// \param DC the context in which the new declaration is being 2408/// declared. 2409/// 2410/// \returns true if PrevDecl is an out-of-scope previous declaration 2411/// for a new delcaration with the same name. 2412static bool 2413isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2414 ASTContext &Context) { 2415 if (!PrevDecl) 2416 return 0; 2417 2418 if (!PrevDecl->hasLinkage()) 2419 return false; 2420 2421 if (Context.getLangOptions().CPlusPlus) { 2422 // C++ [basic.link]p6: 2423 // If there is a visible declaration of an entity with linkage 2424 // having the same name and type, ignoring entities declared 2425 // outside the innermost enclosing namespace scope, the block 2426 // scope declaration declares that same entity and receives the 2427 // linkage of the previous declaration. 2428 DeclContext *OuterContext = DC->getLookupContext(); 2429 if (!OuterContext->isFunctionOrMethod()) 2430 // This rule only applies to block-scope declarations. 2431 return false; 2432 else { 2433 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2434 if (PrevOuterContext->isRecord()) 2435 // We found a member function: ignore it. 2436 return false; 2437 else { 2438 // Find the innermost enclosing namespace for the new and 2439 // previous declarations. 2440 while (!OuterContext->isFileContext()) 2441 OuterContext = OuterContext->getParent(); 2442 while (!PrevOuterContext->isFileContext()) 2443 PrevOuterContext = PrevOuterContext->getParent(); 2444 2445 // The previous declaration is in a different namespace, so it 2446 // isn't the same function. 2447 if (OuterContext->getPrimaryContext() != 2448 PrevOuterContext->getPrimaryContext()) 2449 return false; 2450 } 2451 } 2452 } 2453 2454 return true; 2455} 2456 2457static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 2458 CXXScopeSpec &SS = D.getCXXScopeSpec(); 2459 if (!SS.isSet()) return; 2460 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()), 2461 SS.getRange()); 2462} 2463 2464NamedDecl* 2465Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2466 QualType R, TypeSourceInfo *TInfo, 2467 LookupResult &Previous, 2468 MultiTemplateParamsArg TemplateParamLists, 2469 bool &Redeclaration) { 2470 DeclarationName Name = GetNameForDeclarator(D); 2471 2472 // Check that there are no default arguments (C++ only). 2473 if (getLangOptions().CPlusPlus) 2474 CheckExtraCXXDefaultArguments(D); 2475 2476 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 2477 assert(SCSpec != DeclSpec::SCS_typedef && 2478 "Parser allowed 'typedef' as storage class VarDecl."); 2479 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec, 0); 2480 if (SCSpec == DeclSpec::SCS_mutable) { 2481 // mutable can only appear on non-static class members, so it's always 2482 // an error here 2483 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2484 D.setInvalidType(); 2485 SC = VarDecl::None; 2486 } 2487 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 2488 VarDecl::StorageClass SCAsWritten 2489 = StorageClassSpecToVarDeclStorageClass(SCSpec, DC); 2490 2491 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2492 if (!II) { 2493 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2494 << Name.getAsString(); 2495 return 0; 2496 } 2497 2498 DiagnoseFunctionSpecifiers(D); 2499 2500 if (!DC->isRecord() && S->getFnParent() == 0) { 2501 // C99 6.9p2: The storage-class specifiers auto and register shall not 2502 // appear in the declaration specifiers in an external declaration. 2503 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 2504 2505 // If this is a register variable with an asm label specified, then this 2506 // is a GNU extension. 2507 if (SC == VarDecl::Register && D.getAsmLabel()) 2508 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2509 else 2510 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2511 D.setInvalidType(); 2512 } 2513 } 2514 if (DC->isRecord() && !CurContext->isRecord()) { 2515 // This is an out-of-line definition of a static data member. 2516 if (SC == VarDecl::Static) { 2517 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2518 diag::err_static_out_of_line) 2519 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2520 } else if (SC == VarDecl::None) 2521 SC = VarDecl::Static; 2522 } 2523 if (SC == VarDecl::Static) { 2524 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2525 if (RD->isLocalClass()) 2526 Diag(D.getIdentifierLoc(), 2527 diag::err_static_data_member_not_allowed_in_local_class) 2528 << Name << RD->getDeclName(); 2529 } 2530 } 2531 2532 // Match up the template parameter lists with the scope specifier, then 2533 // determine whether we have a template or a template specialization. 2534 bool isExplicitSpecialization = false; 2535 if (TemplateParameterList *TemplateParams 2536 = MatchTemplateParametersToScopeSpecifier( 2537 D.getDeclSpec().getSourceRange().getBegin(), 2538 D.getCXXScopeSpec(), 2539 (TemplateParameterList**)TemplateParamLists.get(), 2540 TemplateParamLists.size(), 2541 /*never a friend*/ false, 2542 isExplicitSpecialization)) { 2543 if (TemplateParams->size() > 0) { 2544 // There is no such thing as a variable template. 2545 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2546 << II 2547 << SourceRange(TemplateParams->getTemplateLoc(), 2548 TemplateParams->getRAngleLoc()); 2549 return 0; 2550 } else { 2551 // There is an extraneous 'template<>' for this variable. Complain 2552 // about it, but allow the declaration of the variable. 2553 Diag(TemplateParams->getTemplateLoc(), 2554 diag::err_template_variable_noparams) 2555 << II 2556 << SourceRange(TemplateParams->getTemplateLoc(), 2557 TemplateParams->getRAngleLoc()); 2558 2559 isExplicitSpecialization = true; 2560 } 2561 } 2562 2563 VarDecl *NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2564 II, R, TInfo, SC, SCAsWritten); 2565 2566 if (D.isInvalidType()) 2567 NewVD->setInvalidDecl(); 2568 2569 SetNestedNameSpecifier(NewVD, D); 2570 2571 if (D.getDeclSpec().isThreadSpecified()) { 2572 if (NewVD->hasLocalStorage()) 2573 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2574 else if (!Context.Target.isTLSSupported()) 2575 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2576 else 2577 NewVD->setThreadSpecified(true); 2578 } 2579 2580 // Set the lexical context. If the declarator has a C++ scope specifier, the 2581 // lexical context will be different from the semantic context. 2582 NewVD->setLexicalDeclContext(CurContext); 2583 2584 // Handle attributes prior to checking for duplicates in MergeVarDecl 2585 ProcessDeclAttributes(S, NewVD, D); 2586 2587 // Handle GNU asm-label extension (encoded as an attribute). 2588 if (Expr *E = (Expr*) D.getAsmLabel()) { 2589 // The parser guarantees this is a string. 2590 StringLiteral *SE = cast<StringLiteral>(E); 2591 NewVD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 2592 } 2593 2594 // Diagnose shadowed variables before filtering for scope. 2595 if (!D.getCXXScopeSpec().isSet()) 2596 CheckShadow(S, NewVD, Previous); 2597 2598 // Don't consider existing declarations that are in a different 2599 // scope and are out-of-semantic-context declarations (if the new 2600 // declaration has linkage). 2601 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2602 2603 // Merge the decl with the existing one if appropriate. 2604 if (!Previous.empty()) { 2605 if (Previous.isSingleResult() && 2606 isa<FieldDecl>(Previous.getFoundDecl()) && 2607 D.getCXXScopeSpec().isSet()) { 2608 // The user tried to define a non-static data member 2609 // out-of-line (C++ [dcl.meaning]p1). 2610 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2611 << D.getCXXScopeSpec().getRange(); 2612 Previous.clear(); 2613 NewVD->setInvalidDecl(); 2614 } 2615 } else if (D.getCXXScopeSpec().isSet()) { 2616 // No previous declaration in the qualifying scope. 2617 Diag(D.getIdentifierLoc(), diag::err_no_member) 2618 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2619 << D.getCXXScopeSpec().getRange(); 2620 NewVD->setInvalidDecl(); 2621 } 2622 2623 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2624 2625 // This is an explicit specialization of a static data member. Check it. 2626 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2627 CheckMemberSpecialization(NewVD, Previous)) 2628 NewVD->setInvalidDecl(); 2629 2630 // attributes declared post-definition are currently ignored 2631 if (Previous.isSingleResult()) { 2632 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2633 if (Def && (Def = Def->getDefinition()) && 2634 Def != NewVD && D.hasAttributes()) { 2635 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2636 Diag(Def->getLocation(), diag::note_previous_definition); 2637 } 2638 } 2639 2640 // If this is a locally-scoped extern C variable, update the map of 2641 // such variables. 2642 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2643 !NewVD->isInvalidDecl()) 2644 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2645 2646 return NewVD; 2647} 2648 2649/// \brief Diagnose variable or built-in function shadowing. Implements 2650/// -Wshadow. 2651/// 2652/// This method is called whenever a VarDecl is added to a "useful" 2653/// scope. 2654/// 2655/// \param S the scope in which the shadowing name is being declared 2656/// \param R the lookup of the name 2657/// 2658void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 2659 // Return if warning is ignored. 2660 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow) == Diagnostic::Ignored) 2661 return; 2662 2663 // Don't diagnose declarations at file scope. The scope might not 2664 // have a DeclContext if (e.g.) we're parsing a function prototype. 2665 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity()); 2666 if (NewDC && NewDC->isFileContext()) 2667 return; 2668 2669 // Only diagnose if we're shadowing an unambiguous field or variable. 2670 if (R.getResultKind() != LookupResult::Found) 2671 return; 2672 2673 NamedDecl* ShadowedDecl = R.getFoundDecl(); 2674 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 2675 return; 2676 2677 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 2678 2679 // Only warn about certain kinds of shadowing for class members. 2680 if (NewDC && NewDC->isRecord()) { 2681 // In particular, don't warn about shadowing non-class members. 2682 if (!OldDC->isRecord()) 2683 return; 2684 2685 // TODO: should we warn about static data members shadowing 2686 // static data members from base classes? 2687 2688 // TODO: don't diagnose for inaccessible shadowed members. 2689 // This is hard to do perfectly because we might friend the 2690 // shadowing context, but that's just a false negative. 2691 } 2692 2693 // Determine what kind of declaration we're shadowing. 2694 unsigned Kind; 2695 if (isa<RecordDecl>(OldDC)) { 2696 if (isa<FieldDecl>(ShadowedDecl)) 2697 Kind = 3; // field 2698 else 2699 Kind = 2; // static data member 2700 } else if (OldDC->isFileContext()) 2701 Kind = 1; // global 2702 else 2703 Kind = 0; // local 2704 2705 DeclarationName Name = R.getLookupName(); 2706 2707 // Emit warning and note. 2708 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 2709 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 2710} 2711 2712/// \brief Check -Wshadow without the advantage of a previous lookup. 2713void Sema::CheckShadow(Scope *S, VarDecl *D) { 2714 LookupResult R(*this, D->getDeclName(), D->getLocation(), 2715 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 2716 LookupName(R, S); 2717 CheckShadow(S, D, R); 2718} 2719 2720/// \brief Perform semantic checking on a newly-created variable 2721/// declaration. 2722/// 2723/// This routine performs all of the type-checking required for a 2724/// variable declaration once it has been built. It is used both to 2725/// check variables after they have been parsed and their declarators 2726/// have been translated into a declaration, and to check variables 2727/// that have been instantiated from a template. 2728/// 2729/// Sets NewVD->isInvalidDecl() if an error was encountered. 2730void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2731 LookupResult &Previous, 2732 bool &Redeclaration) { 2733 // If the decl is already known invalid, don't check it. 2734 if (NewVD->isInvalidDecl()) 2735 return; 2736 2737 QualType T = NewVD->getType(); 2738 2739 if (T->isObjCObjectType()) { 2740 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2741 return NewVD->setInvalidDecl(); 2742 } 2743 2744 // Emit an error if an address space was applied to decl with local storage. 2745 // This includes arrays of objects with address space qualifiers, but not 2746 // automatic variables that point to other address spaces. 2747 // ISO/IEC TR 18037 S5.1.2 2748 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2749 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2750 return NewVD->setInvalidDecl(); 2751 } 2752 2753 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2754 && !NewVD->hasAttr<BlocksAttr>()) 2755 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2756 2757 bool isVM = T->isVariablyModifiedType(); 2758 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2759 NewVD->hasAttr<BlocksAttr>() || 2760 // FIXME: We need to diagnose jumps passed initialized variables in C++. 2761 // However, this turns on the scope checker for everything with a variable 2762 // which may impact compile time. See if we can find a better solution 2763 // to this, perhaps only checking functions that contain gotos in C++? 2764 (LangOpts.CPlusPlus && NewVD->hasLocalStorage())) 2765 FunctionNeedsScopeChecking() = true; 2766 2767 if ((isVM && NewVD->hasLinkage()) || 2768 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2769 bool SizeIsNegative; 2770 QualType FixedTy = 2771 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2772 2773 if (FixedTy.isNull() && T->isVariableArrayType()) { 2774 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2775 // FIXME: This won't give the correct result for 2776 // int a[10][n]; 2777 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2778 2779 if (NewVD->isFileVarDecl()) 2780 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2781 << SizeRange; 2782 else if (NewVD->getStorageClass() == VarDecl::Static) 2783 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2784 << SizeRange; 2785 else 2786 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2787 << SizeRange; 2788 return NewVD->setInvalidDecl(); 2789 } 2790 2791 if (FixedTy.isNull()) { 2792 if (NewVD->isFileVarDecl()) 2793 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2794 else 2795 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2796 return NewVD->setInvalidDecl(); 2797 } 2798 2799 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2800 NewVD->setType(FixedTy); 2801 } 2802 2803 if (Previous.empty() && NewVD->isExternC()) { 2804 // Since we did not find anything by this name and we're declaring 2805 // an extern "C" variable, look for a non-visible extern "C" 2806 // declaration with the same name. 2807 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2808 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2809 if (Pos != LocallyScopedExternalDecls.end()) 2810 Previous.addDecl(Pos->second); 2811 } 2812 2813 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2814 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2815 << T; 2816 return NewVD->setInvalidDecl(); 2817 } 2818 2819 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2820 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2821 return NewVD->setInvalidDecl(); 2822 } 2823 2824 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2825 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2826 return NewVD->setInvalidDecl(); 2827 } 2828 2829 if (!Previous.empty()) { 2830 Redeclaration = true; 2831 MergeVarDecl(NewVD, Previous); 2832 } 2833} 2834 2835/// \brief Data used with FindOverriddenMethod 2836struct FindOverriddenMethodData { 2837 Sema *S; 2838 CXXMethodDecl *Method; 2839}; 2840 2841/// \brief Member lookup function that determines whether a given C++ 2842/// method overrides a method in a base class, to be used with 2843/// CXXRecordDecl::lookupInBases(). 2844static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 2845 CXXBasePath &Path, 2846 void *UserData) { 2847 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2848 2849 FindOverriddenMethodData *Data 2850 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 2851 2852 DeclarationName Name = Data->Method->getDeclName(); 2853 2854 // FIXME: Do we care about other names here too? 2855 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2856 // We really want to find the base class constructor here. 2857 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 2858 CanQualType CT = Data->S->Context.getCanonicalType(T); 2859 2860 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 2861 } 2862 2863 for (Path.Decls = BaseRecord->lookup(Name); 2864 Path.Decls.first != Path.Decls.second; 2865 ++Path.Decls.first) { 2866 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*Path.Decls.first)) { 2867 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD)) 2868 return true; 2869 } 2870 } 2871 2872 return false; 2873} 2874 2875/// AddOverriddenMethods - See if a method overrides any in the base classes, 2876/// and if so, check that it's a valid override and remember it. 2877void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2878 // Look for virtual methods in base classes that this method might override. 2879 CXXBasePaths Paths; 2880 FindOverriddenMethodData Data; 2881 Data.Method = MD; 2882 Data.S = this; 2883 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 2884 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 2885 E = Paths.found_decls_end(); I != E; ++I) { 2886 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2887 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 2888 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 2889 !CheckOverridingFunctionAttributes(MD, OldMD)) 2890 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 2891 } 2892 } 2893 } 2894} 2895 2896NamedDecl* 2897Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2898 QualType R, TypeSourceInfo *TInfo, 2899 LookupResult &Previous, 2900 MultiTemplateParamsArg TemplateParamLists, 2901 bool IsFunctionDefinition, bool &Redeclaration) { 2902 assert(R.getTypePtr()->isFunctionType()); 2903 2904 DeclarationName Name = GetNameForDeclarator(D); 2905 FunctionDecl::StorageClass SC = FunctionDecl::None; 2906 switch (D.getDeclSpec().getStorageClassSpec()) { 2907 default: assert(0 && "Unknown storage class!"); 2908 case DeclSpec::SCS_auto: 2909 case DeclSpec::SCS_register: 2910 case DeclSpec::SCS_mutable: 2911 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2912 diag::err_typecheck_sclass_func); 2913 D.setInvalidType(); 2914 break; 2915 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2916 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2917 case DeclSpec::SCS_static: { 2918 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2919 // C99 6.7.1p5: 2920 // The declaration of an identifier for a function that has 2921 // block scope shall have no explicit storage-class specifier 2922 // other than extern 2923 // See also (C++ [dcl.stc]p4). 2924 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2925 diag::err_static_block_func); 2926 SC = FunctionDecl::None; 2927 } else 2928 SC = FunctionDecl::Static; 2929 break; 2930 } 2931 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2932 } 2933 2934 if (D.getDeclSpec().isThreadSpecified()) 2935 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2936 2937 bool isFriend = D.getDeclSpec().isFriendSpecified(); 2938 bool isInline = D.getDeclSpec().isInlineSpecified(); 2939 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2940 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2941 2942 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 2943 FunctionDecl::StorageClass SCAsWritten 2944 = StorageClassSpecToFunctionDeclStorageClass(SCSpec, DC); 2945 2946 // Check that the return type is not an abstract class type. 2947 // For record types, this is done by the AbstractClassUsageDiagnoser once 2948 // the class has been completely parsed. 2949 if (!DC->isRecord() && 2950 RequireNonAbstractType(D.getIdentifierLoc(), 2951 R->getAs<FunctionType>()->getResultType(), 2952 diag::err_abstract_type_in_decl, 2953 AbstractReturnType)) 2954 D.setInvalidType(); 2955 2956 // Do not allow returning a objc interface by-value. 2957 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 2958 Diag(D.getIdentifierLoc(), 2959 diag::err_object_cannot_be_passed_returned_by_value) << 0 2960 << R->getAs<FunctionType>()->getResultType(); 2961 D.setInvalidType(); 2962 } 2963 2964 bool isVirtualOkay = false; 2965 FunctionDecl *NewFD; 2966 2967 if (isFriend) { 2968 // C++ [class.friend]p5 2969 // A function can be defined in a friend declaration of a 2970 // class . . . . Such a function is implicitly inline. 2971 isInline |= IsFunctionDefinition; 2972 } 2973 2974 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 2975 // This is a C++ constructor declaration. 2976 assert(DC->isRecord() && 2977 "Constructors can only be declared in a member context"); 2978 2979 R = CheckConstructorDeclarator(D, R, SC); 2980 2981 // Create the new declaration 2982 NewFD = CXXConstructorDecl::Create(Context, 2983 cast<CXXRecordDecl>(DC), 2984 D.getIdentifierLoc(), Name, R, TInfo, 2985 isExplicit, isInline, 2986 /*isImplicitlyDeclared=*/false); 2987 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2988 // This is a C++ destructor declaration. 2989 if (DC->isRecord()) { 2990 R = CheckDestructorDeclarator(D, SC); 2991 2992 NewFD = CXXDestructorDecl::Create(Context, 2993 cast<CXXRecordDecl>(DC), 2994 D.getIdentifierLoc(), Name, R, 2995 isInline, 2996 /*isImplicitlyDeclared=*/false); 2997 NewFD->setTypeSourceInfo(TInfo); 2998 2999 isVirtualOkay = true; 3000 } else { 3001 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 3002 3003 // Create a FunctionDecl to satisfy the function definition parsing 3004 // code path. 3005 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 3006 Name, R, TInfo, SC, SCAsWritten, isInline, 3007 /*hasPrototype=*/true); 3008 D.setInvalidType(); 3009 } 3010 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 3011 if (!DC->isRecord()) { 3012 Diag(D.getIdentifierLoc(), 3013 diag::err_conv_function_not_member); 3014 return 0; 3015 } 3016 3017 CheckConversionDeclarator(D, R, SC); 3018 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 3019 D.getIdentifierLoc(), Name, R, TInfo, 3020 isInline, isExplicit); 3021 3022 isVirtualOkay = true; 3023 } else if (DC->isRecord()) { 3024 // If the of the function is the same as the name of the record, then this 3025 // must be an invalid constructor that has a return type. 3026 // (The parser checks for a return type and makes the declarator a 3027 // constructor if it has no return type). 3028 // must have an invalid constructor that has a return type 3029 if (Name.getAsIdentifierInfo() && 3030 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 3031 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 3032 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3033 << SourceRange(D.getIdentifierLoc()); 3034 return 0; 3035 } 3036 3037 bool isStatic = SC == FunctionDecl::Static; 3038 3039 // [class.free]p1: 3040 // Any allocation function for a class T is a static member 3041 // (even if not explicitly declared static). 3042 if (Name.getCXXOverloadedOperator() == OO_New || 3043 Name.getCXXOverloadedOperator() == OO_Array_New) 3044 isStatic = true; 3045 3046 // [class.free]p6 Any deallocation function for a class X is a static member 3047 // (even if not explicitly declared static). 3048 if (Name.getCXXOverloadedOperator() == OO_Delete || 3049 Name.getCXXOverloadedOperator() == OO_Array_Delete) 3050 isStatic = true; 3051 3052 // This is a C++ method declaration. 3053 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 3054 D.getIdentifierLoc(), Name, R, TInfo, 3055 isStatic, SCAsWritten, isInline); 3056 3057 isVirtualOkay = !isStatic; 3058 } else { 3059 // Determine whether the function was written with a 3060 // prototype. This true when: 3061 // - we're in C++ (where every function has a prototype), 3062 // - there is a prototype in the declarator, or 3063 // - the type R of the function is some kind of typedef or other reference 3064 // to a type name (which eventually refers to a function type). 3065 bool HasPrototype = 3066 getLangOptions().CPlusPlus || 3067 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 3068 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 3069 3070 NewFD = FunctionDecl::Create(Context, DC, 3071 D.getIdentifierLoc(), 3072 Name, R, TInfo, SC, SCAsWritten, isInline, 3073 HasPrototype); 3074 } 3075 3076 if (D.isInvalidType()) 3077 NewFD->setInvalidDecl(); 3078 3079 SetNestedNameSpecifier(NewFD, D); 3080 3081 // Set the lexical context. If the declarator has a C++ 3082 // scope specifier, or is the object of a friend declaration, the 3083 // lexical context will be different from the semantic context. 3084 NewFD->setLexicalDeclContext(CurContext); 3085 3086 // Match up the template parameter lists with the scope specifier, then 3087 // determine whether we have a template or a template specialization. 3088 FunctionTemplateDecl *FunctionTemplate = 0; 3089 bool isExplicitSpecialization = false; 3090 bool isFunctionTemplateSpecialization = false; 3091 if (TemplateParameterList *TemplateParams 3092 = MatchTemplateParametersToScopeSpecifier( 3093 D.getDeclSpec().getSourceRange().getBegin(), 3094 D.getCXXScopeSpec(), 3095 (TemplateParameterList**)TemplateParamLists.get(), 3096 TemplateParamLists.size(), 3097 isFriend, 3098 isExplicitSpecialization)) { 3099 if (TemplateParams->size() > 0) { 3100 // This is a function template 3101 3102 // Check that we can declare a template here. 3103 if (CheckTemplateDeclScope(S, TemplateParams)) 3104 return 0; 3105 3106 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 3107 NewFD->getLocation(), 3108 Name, TemplateParams, 3109 NewFD); 3110 FunctionTemplate->setLexicalDeclContext(CurContext); 3111 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 3112 } else { 3113 // This is a function template specialization. 3114 isFunctionTemplateSpecialization = true; 3115 3116 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 3117 if (isFriend && isFunctionTemplateSpecialization) { 3118 // We want to remove the "template<>", found here. 3119 SourceRange RemoveRange = TemplateParams->getSourceRange(); 3120 3121 // If we remove the template<> and the name is not a 3122 // template-id, we're actually silently creating a problem: 3123 // the friend declaration will refer to an untemplated decl, 3124 // and clearly the user wants a template specialization. So 3125 // we need to insert '<>' after the name. 3126 SourceLocation InsertLoc; 3127 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 3128 InsertLoc = D.getName().getSourceRange().getEnd(); 3129 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 3130 } 3131 3132 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 3133 << Name << RemoveRange 3134 << FixItHint::CreateRemoval(RemoveRange) 3135 << FixItHint::CreateInsertion(InsertLoc, "<>"); 3136 } 3137 } 3138 3139 // FIXME: Free this memory properly. 3140 TemplateParamLists.release(); 3141 } 3142 3143 // C++ [dcl.fct.spec]p5: 3144 // The virtual specifier shall only be used in declarations of 3145 // nonstatic class member functions that appear within a 3146 // member-specification of a class declaration; see 10.3. 3147 // 3148 if (isVirtual && !NewFD->isInvalidDecl()) { 3149 if (!isVirtualOkay) { 3150 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3151 diag::err_virtual_non_function); 3152 } else if (!CurContext->isRecord()) { 3153 // 'virtual' was specified outside of the class. 3154 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 3155 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 3156 } else { 3157 // Okay: Add virtual to the method. 3158 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 3159 CurClass->setMethodAsVirtual(NewFD); 3160 } 3161 } 3162 3163 // C++ [dcl.fct.spec]p6: 3164 // The explicit specifier shall be used only in the declaration of a 3165 // constructor or conversion function within its class definition; see 12.3.1 3166 // and 12.3.2. 3167 if (isExplicit && !NewFD->isInvalidDecl()) { 3168 if (!CurContext->isRecord()) { 3169 // 'explicit' was specified outside of the class. 3170 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3171 diag::err_explicit_out_of_class) 3172 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3173 } else if (!isa<CXXConstructorDecl>(NewFD) && 3174 !isa<CXXConversionDecl>(NewFD)) { 3175 // 'explicit' was specified on a function that wasn't a constructor 3176 // or conversion function. 3177 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3178 diag::err_explicit_non_ctor_or_conv_function) 3179 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3180 } 3181 } 3182 3183 // Filter out previous declarations that don't match the scope. 3184 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3185 3186 if (isFriend) { 3187 // DC is the namespace in which the function is being declared. 3188 assert((DC->isFileContext() || !Previous.empty()) && 3189 "previously-undeclared friend function being created " 3190 "in a non-namespace context"); 3191 3192 // For now, claim that the objects have no previous declaration. 3193 if (FunctionTemplate) { 3194 FunctionTemplate->setObjectOfFriendDecl(false); 3195 FunctionTemplate->setAccess(AS_public); 3196 } 3197 NewFD->setObjectOfFriendDecl(false); 3198 NewFD->setAccess(AS_public); 3199 } 3200 3201 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 3202 !CurContext->isRecord()) { 3203 // C++ [class.static]p1: 3204 // A data or function member of a class may be declared static 3205 // in a class definition, in which case it is a static member of 3206 // the class. 3207 3208 // Complain about the 'static' specifier if it's on an out-of-line 3209 // member function definition. 3210 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3211 diag::err_static_out_of_line) 3212 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3213 } 3214 3215 // Handle GNU asm-label extension (encoded as an attribute). 3216 if (Expr *E = (Expr*) D.getAsmLabel()) { 3217 // The parser guarantees this is a string. 3218 StringLiteral *SE = cast<StringLiteral>(E); 3219 NewFD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 3220 } 3221 3222 // Copy the parameter declarations from the declarator D to the function 3223 // declaration NewFD, if they are available. First scavenge them into Params. 3224 llvm::SmallVector<ParmVarDecl*, 16> Params; 3225 if (D.getNumTypeObjects() > 0) { 3226 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3227 3228 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 3229 // function that takes no arguments, not a function that takes a 3230 // single void argument. 3231 // We let through "const void" here because Sema::GetTypeForDeclarator 3232 // already checks for that case. 3233 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3234 FTI.ArgInfo[0].Param && 3235 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 3236 // Empty arg list, don't push any params. 3237 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 3238 3239 // In C++, the empty parameter-type-list must be spelled "void"; a 3240 // typedef of void is not permitted. 3241 if (getLangOptions().CPlusPlus && 3242 Param->getType().getUnqualifiedType() != Context.VoidTy) 3243 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 3244 // FIXME: Leaks decl? 3245 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 3246 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 3247 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 3248 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 3249 Param->setDeclContext(NewFD); 3250 Params.push_back(Param); 3251 3252 if (Param->isInvalidDecl()) 3253 NewFD->setInvalidDecl(); 3254 } 3255 } 3256 3257 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 3258 // When we're declaring a function with a typedef, typeof, etc as in the 3259 // following example, we'll need to synthesize (unnamed) 3260 // parameters for use in the declaration. 3261 // 3262 // @code 3263 // typedef void fn(int); 3264 // fn f; 3265 // @endcode 3266 3267 // Synthesize a parameter for each argument type. 3268 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3269 AE = FT->arg_type_end(); AI != AE; ++AI) { 3270 ParmVarDecl *Param = 3271 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 3272 Params.push_back(Param); 3273 } 3274 } else { 3275 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 3276 "Should not need args for typedef of non-prototype fn"); 3277 } 3278 // Finally, we know we have the right number of parameters, install them. 3279 NewFD->setParams(Params.data(), Params.size()); 3280 3281 // If the declarator is a template-id, translate the parser's template 3282 // argument list into our AST format. 3283 bool HasExplicitTemplateArgs = false; 3284 TemplateArgumentListInfo TemplateArgs; 3285 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3286 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3287 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3288 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3289 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3290 TemplateId->getTemplateArgs(), 3291 TemplateId->NumArgs); 3292 translateTemplateArguments(TemplateArgsPtr, 3293 TemplateArgs); 3294 TemplateArgsPtr.release(); 3295 3296 HasExplicitTemplateArgs = true; 3297 3298 if (FunctionTemplate) { 3299 // FIXME: Diagnose function template with explicit template 3300 // arguments. 3301 HasExplicitTemplateArgs = false; 3302 } else if (!isFunctionTemplateSpecialization && 3303 !D.getDeclSpec().isFriendSpecified()) { 3304 // We have encountered something that the user meant to be a 3305 // specialization (because it has explicitly-specified template 3306 // arguments) but that was not introduced with a "template<>" (or had 3307 // too few of them). 3308 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3309 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3310 << FixItHint::CreateInsertion( 3311 D.getDeclSpec().getSourceRange().getBegin(), 3312 "template<> "); 3313 isFunctionTemplateSpecialization = true; 3314 } else { 3315 // "friend void foo<>(int);" is an implicit specialization decl. 3316 isFunctionTemplateSpecialization = true; 3317 } 3318 } else if (isFriend && isFunctionTemplateSpecialization) { 3319 // This combination is only possible in a recovery case; the user 3320 // wrote something like: 3321 // template <> friend void foo(int); 3322 // which we're recovering from as if the user had written: 3323 // friend void foo<>(int); 3324 // Go ahead and fake up a template id. 3325 HasExplicitTemplateArgs = true; 3326 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 3327 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 3328 } 3329 3330 // If it's a friend (and only if it's a friend), it's possible 3331 // that either the specialized function type or the specialized 3332 // template is dependent, and therefore matching will fail. In 3333 // this case, don't check the specialization yet. 3334 if (isFunctionTemplateSpecialization && isFriend && 3335 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 3336 assert(HasExplicitTemplateArgs && 3337 "friend function specialization without template args"); 3338 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 3339 Previous)) 3340 NewFD->setInvalidDecl(); 3341 } else if (isFunctionTemplateSpecialization) { 3342 if (CheckFunctionTemplateSpecialization(NewFD, 3343 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3344 Previous)) 3345 NewFD->setInvalidDecl(); 3346 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 3347 if (CheckMemberSpecialization(NewFD, Previous)) 3348 NewFD->setInvalidDecl(); 3349 } 3350 3351 // Perform semantic checking on the function declaration. 3352 bool OverloadableAttrRequired = false; // FIXME: HACK! 3353 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3354 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 3355 3356 assert((NewFD->isInvalidDecl() || !Redeclaration || 3357 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3358 "previous declaration set still overloaded"); 3359 3360 NamedDecl *PrincipalDecl = (FunctionTemplate 3361 ? cast<NamedDecl>(FunctionTemplate) 3362 : NewFD); 3363 3364 if (isFriend && Redeclaration) { 3365 AccessSpecifier Access = AS_public; 3366 if (!NewFD->isInvalidDecl()) 3367 Access = NewFD->getPreviousDeclaration()->getAccess(); 3368 3369 NewFD->setAccess(Access); 3370 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 3371 3372 PrincipalDecl->setObjectOfFriendDecl(true); 3373 } 3374 3375 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 3376 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 3377 PrincipalDecl->setNonMemberOperator(); 3378 3379 // If we have a function template, check the template parameter 3380 // list. This will check and merge default template arguments. 3381 if (FunctionTemplate) { 3382 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3383 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3384 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3385 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3386 : TPC_FunctionTemplate); 3387 } 3388 3389 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 3390 // Fake up an access specifier if it's supposed to be a class member. 3391 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext())) 3392 NewFD->setAccess(AS_public); 3393 3394 // An out-of-line member function declaration must also be a 3395 // definition (C++ [dcl.meaning]p1). 3396 // Note that this is not the case for explicit specializations of 3397 // function templates or member functions of class templates, per 3398 // C++ [temp.expl.spec]p2. 3399 if (!IsFunctionDefinition && !isFriend && 3400 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 3401 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 3402 << D.getCXXScopeSpec().getRange(); 3403 NewFD->setInvalidDecl(); 3404 } else if (!Redeclaration && 3405 !(isFriend && CurContext->isDependentContext())) { 3406 // The user tried to provide an out-of-line definition for a 3407 // function that is a member of a class or namespace, but there 3408 // was no such member function declared (C++ [class.mfct]p2, 3409 // C++ [namespace.memdef]p2). For example: 3410 // 3411 // class X { 3412 // void f() const; 3413 // }; 3414 // 3415 // void X::f() { } // ill-formed 3416 // 3417 // Complain about this problem, and attempt to suggest close 3418 // matches (e.g., those that differ only in cv-qualifiers and 3419 // whether the parameter types are references). 3420 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3421 << Name << DC << D.getCXXScopeSpec().getRange(); 3422 NewFD->setInvalidDecl(); 3423 3424 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 3425 ForRedeclaration); 3426 LookupQualifiedName(Prev, DC); 3427 assert(!Prev.isAmbiguous() && 3428 "Cannot have an ambiguity in previous-declaration lookup"); 3429 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3430 Func != FuncEnd; ++Func) { 3431 if (isa<FunctionDecl>(*Func) && 3432 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 3433 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3434 } 3435 } 3436 } 3437 3438 // Handle attributes. We need to have merged decls when handling attributes 3439 // (for example to check for conflicts, etc). 3440 // FIXME: This needs to happen before we merge declarations. Then, 3441 // let attribute merging cope with attribute conflicts. 3442 ProcessDeclAttributes(S, NewFD, D); 3443 3444 // attributes declared post-definition are currently ignored 3445 if (Redeclaration && Previous.isSingleResult()) { 3446 const FunctionDecl *Def; 3447 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3448 if (PrevFD && PrevFD->getBody(Def) && D.hasAttributes()) { 3449 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3450 Diag(Def->getLocation(), diag::note_previous_definition); 3451 } 3452 } 3453 3454 AddKnownFunctionAttributes(NewFD); 3455 3456 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 3457 // If a function name is overloadable in C, then every function 3458 // with that name must be marked "overloadable". 3459 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3460 << Redeclaration << NewFD; 3461 if (!Previous.empty()) 3462 Diag(Previous.getRepresentativeDecl()->getLocation(), 3463 diag::note_attribute_overloadable_prev_overload); 3464 NewFD->addAttr(::new (Context) OverloadableAttr()); 3465 } 3466 3467 // If this is a locally-scoped extern C function, update the 3468 // map of such names. 3469 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3470 && !NewFD->isInvalidDecl()) 3471 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3472 3473 // Set this FunctionDecl's range up to the right paren. 3474 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3475 3476 if (FunctionTemplate && NewFD->isInvalidDecl()) 3477 FunctionTemplate->setInvalidDecl(); 3478 3479 if (FunctionTemplate) 3480 return FunctionTemplate; 3481 3482 3483 // Keep track of static, non-inlined function definitions that 3484 // have not been used. We will warn later. 3485 // FIXME: Also include static functions declared but not defined. 3486 if (!NewFD->isInvalidDecl() && IsFunctionDefinition 3487 && !NewFD->isInlined() && NewFD->getLinkage() == InternalLinkage 3488 && !NewFD->isUsed() && !NewFD->hasAttr<UnusedAttr>() 3489 && !NewFD->hasAttr<ConstructorAttr>() 3490 && !NewFD->hasAttr<DestructorAttr>()) 3491 UnusedStaticFuncs.push_back(NewFD); 3492 3493 return NewFD; 3494} 3495 3496/// \brief Perform semantic checking of a new function declaration. 3497/// 3498/// Performs semantic analysis of the new function declaration 3499/// NewFD. This routine performs all semantic checking that does not 3500/// require the actual declarator involved in the declaration, and is 3501/// used both for the declaration of functions as they are parsed 3502/// (called via ActOnDeclarator) and for the declaration of functions 3503/// that have been instantiated via C++ template instantiation (called 3504/// via InstantiateDecl). 3505/// 3506/// \param IsExplicitSpecialiation whether this new function declaration is 3507/// an explicit specialization of the previous declaration. 3508/// 3509/// This sets NewFD->isInvalidDecl() to true if there was an error. 3510void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3511 LookupResult &Previous, 3512 bool IsExplicitSpecialization, 3513 bool &Redeclaration, 3514 bool &OverloadableAttrRequired) { 3515 // If NewFD is already known erroneous, don't do any of this checking. 3516 if (NewFD->isInvalidDecl()) 3517 return; 3518 3519 if (NewFD->getResultType()->isVariablyModifiedType()) { 3520 // Functions returning a variably modified type violate C99 6.7.5.2p2 3521 // because all functions have linkage. 3522 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3523 return NewFD->setInvalidDecl(); 3524 } 3525 3526 if (NewFD->isMain()) 3527 CheckMain(NewFD); 3528 3529 // Check for a previous declaration of this name. 3530 if (Previous.empty() && NewFD->isExternC()) { 3531 // Since we did not find anything by this name and we're declaring 3532 // an extern "C" function, look for a non-visible extern "C" 3533 // declaration with the same name. 3534 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3535 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3536 if (Pos != LocallyScopedExternalDecls.end()) 3537 Previous.addDecl(Pos->second); 3538 } 3539 3540 // Merge or overload the declaration with an existing declaration of 3541 // the same name, if appropriate. 3542 if (!Previous.empty()) { 3543 // Determine whether NewFD is an overload of PrevDecl or 3544 // a declaration that requires merging. If it's an overload, 3545 // there's no more work to do here; we'll just add the new 3546 // function to the scope. 3547 3548 NamedDecl *OldDecl = 0; 3549 if (!AllowOverloadingOfFunction(Previous, Context)) { 3550 Redeclaration = true; 3551 OldDecl = Previous.getFoundDecl(); 3552 } else { 3553 if (!getLangOptions().CPlusPlus) { 3554 OverloadableAttrRequired = true; 3555 3556 // Functions marked "overloadable" must have a prototype (that 3557 // we can't get through declaration merging). 3558 if (!NewFD->getType()->getAs<FunctionProtoType>()) { 3559 Diag(NewFD->getLocation(), 3560 diag::err_attribute_overloadable_no_prototype) 3561 << NewFD; 3562 Redeclaration = true; 3563 3564 // Turn this into a variadic function with no parameters. 3565 QualType R = Context.getFunctionType( 3566 NewFD->getType()->getAs<FunctionType>()->getResultType(), 3567 0, 0, true, 0, false, false, 0, 0, 3568 FunctionType::ExtInfo()); 3569 NewFD->setType(R); 3570 return NewFD->setInvalidDecl(); 3571 } 3572 } 3573 3574 switch (CheckOverload(NewFD, Previous, OldDecl)) { 3575 case Ovl_Match: 3576 Redeclaration = true; 3577 if (isa<UsingShadowDecl>(OldDecl) && CurContext->isRecord()) { 3578 HideUsingShadowDecl(S, cast<UsingShadowDecl>(OldDecl)); 3579 Redeclaration = false; 3580 } 3581 break; 3582 3583 case Ovl_NonFunction: 3584 Redeclaration = true; 3585 break; 3586 3587 case Ovl_Overload: 3588 Redeclaration = false; 3589 break; 3590 } 3591 } 3592 3593 if (Redeclaration) { 3594 // NewFD and OldDecl represent declarations that need to be 3595 // merged. 3596 if (MergeFunctionDecl(NewFD, OldDecl)) 3597 return NewFD->setInvalidDecl(); 3598 3599 Previous.clear(); 3600 Previous.addDecl(OldDecl); 3601 3602 if (FunctionTemplateDecl *OldTemplateDecl 3603 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3604 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3605 FunctionTemplateDecl *NewTemplateDecl 3606 = NewFD->getDescribedFunctionTemplate(); 3607 assert(NewTemplateDecl && "Template/non-template mismatch"); 3608 if (CXXMethodDecl *Method 3609 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3610 Method->setAccess(OldTemplateDecl->getAccess()); 3611 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3612 } 3613 3614 // If this is an explicit specialization of a member that is a function 3615 // template, mark it as a member specialization. 3616 if (IsExplicitSpecialization && 3617 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3618 NewTemplateDecl->setMemberSpecialization(); 3619 assert(OldTemplateDecl->isMemberSpecialization()); 3620 } 3621 } else { 3622 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3623 NewFD->setAccess(OldDecl->getAccess()); 3624 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3625 } 3626 } 3627 } 3628 3629 // Semantic checking for this function declaration (in isolation). 3630 if (getLangOptions().CPlusPlus) { 3631 // C++-specific checks. 3632 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3633 CheckConstructor(Constructor); 3634 } else if (CXXDestructorDecl *Destructor = 3635 dyn_cast<CXXDestructorDecl>(NewFD)) { 3636 CXXRecordDecl *Record = Destructor->getParent(); 3637 QualType ClassType = Context.getTypeDeclType(Record); 3638 3639 // FIXME: Shouldn't we be able to perform thisc heck even when the class 3640 // type is dependent? Both gcc and edg can handle that. 3641 if (!ClassType->isDependentType()) { 3642 DeclarationName Name 3643 = Context.DeclarationNames.getCXXDestructorName( 3644 Context.getCanonicalType(ClassType)); 3645 if (NewFD->getDeclName() != Name) { 3646 Diag(NewFD->getLocation(), diag::err_destructor_name); 3647 return NewFD->setInvalidDecl(); 3648 } 3649 } 3650 3651 Record->setUserDeclaredDestructor(true); 3652 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3653 // user-defined destructor. 3654 Record->setPOD(false); 3655 3656 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3657 // declared destructor. 3658 // FIXME: C++0x: don't do this for "= default" destructors 3659 Record->setHasTrivialDestructor(false); 3660 } else if (CXXConversionDecl *Conversion 3661 = dyn_cast<CXXConversionDecl>(NewFD)) { 3662 ActOnConversionDeclarator(Conversion); 3663 } 3664 3665 // Find any virtual functions that this function overrides. 3666 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3667 if (!Method->isFunctionTemplateSpecialization() && 3668 !Method->getDescribedFunctionTemplate()) 3669 AddOverriddenMethods(Method->getParent(), Method); 3670 } 3671 3672 // Additional checks for the destructor; make sure we do this after we 3673 // figure out whether the destructor is virtual. 3674 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(NewFD)) 3675 if (!Destructor->getParent()->isDependentType()) 3676 CheckDestructor(Destructor); 3677 3678 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3679 if (NewFD->isOverloadedOperator() && 3680 CheckOverloadedOperatorDeclaration(NewFD)) 3681 return NewFD->setInvalidDecl(); 3682 3683 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3684 if (NewFD->getLiteralIdentifier() && 3685 CheckLiteralOperatorDeclaration(NewFD)) 3686 return NewFD->setInvalidDecl(); 3687 3688 // In C++, check default arguments now that we have merged decls. Unless 3689 // the lexical context is the class, because in this case this is done 3690 // during delayed parsing anyway. 3691 if (!CurContext->isRecord()) 3692 CheckCXXDefaultArguments(NewFD); 3693 } 3694} 3695 3696void Sema::CheckMain(FunctionDecl* FD) { 3697 // C++ [basic.start.main]p3: A program that declares main to be inline 3698 // or static is ill-formed. 3699 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3700 // shall not appear in a declaration of main. 3701 // static main is not an error under C99, but we should warn about it. 3702 bool isInline = FD->isInlineSpecified(); 3703 bool isStatic = FD->getStorageClass() == FunctionDecl::Static; 3704 if (isInline || isStatic) { 3705 unsigned diagID = diag::warn_unusual_main_decl; 3706 if (isInline || getLangOptions().CPlusPlus) 3707 diagID = diag::err_unusual_main_decl; 3708 3709 int which = isStatic + (isInline << 1) - 1; 3710 Diag(FD->getLocation(), diagID) << which; 3711 } 3712 3713 QualType T = FD->getType(); 3714 assert(T->isFunctionType() && "function decl is not of function type"); 3715 const FunctionType* FT = T->getAs<FunctionType>(); 3716 3717 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3718 // TODO: add a replacement fixit to turn the return type into 'int'. 3719 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3720 FD->setInvalidDecl(true); 3721 } 3722 3723 // Treat protoless main() as nullary. 3724 if (isa<FunctionNoProtoType>(FT)) return; 3725 3726 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3727 unsigned nparams = FTP->getNumArgs(); 3728 assert(FD->getNumParams() == nparams); 3729 3730 bool HasExtraParameters = (nparams > 3); 3731 3732 // Darwin passes an undocumented fourth argument of type char**. If 3733 // other platforms start sprouting these, the logic below will start 3734 // getting shifty. 3735 if (nparams == 4 && 3736 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 3737 HasExtraParameters = false; 3738 3739 if (HasExtraParameters) { 3740 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 3741 FD->setInvalidDecl(true); 3742 nparams = 3; 3743 } 3744 3745 // FIXME: a lot of the following diagnostics would be improved 3746 // if we had some location information about types. 3747 3748 QualType CharPP = 3749 Context.getPointerType(Context.getPointerType(Context.CharTy)); 3750 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 3751 3752 for (unsigned i = 0; i < nparams; ++i) { 3753 QualType AT = FTP->getArgType(i); 3754 3755 bool mismatch = true; 3756 3757 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 3758 mismatch = false; 3759 else if (Expected[i] == CharPP) { 3760 // As an extension, the following forms are okay: 3761 // char const ** 3762 // char const * const * 3763 // char * const * 3764 3765 QualifierCollector qs; 3766 const PointerType* PT; 3767 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 3768 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 3769 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 3770 qs.removeConst(); 3771 mismatch = !qs.empty(); 3772 } 3773 } 3774 3775 if (mismatch) { 3776 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 3777 // TODO: suggest replacing given type with expected type 3778 FD->setInvalidDecl(true); 3779 } 3780 } 3781 3782 if (nparams == 1 && !FD->isInvalidDecl()) { 3783 Diag(FD->getLocation(), diag::warn_main_one_arg); 3784 } 3785} 3786 3787bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 3788 // FIXME: Need strict checking. In C89, we need to check for 3789 // any assignment, increment, decrement, function-calls, or 3790 // commas outside of a sizeof. In C99, it's the same list, 3791 // except that the aforementioned are allowed in unevaluated 3792 // expressions. Everything else falls under the 3793 // "may accept other forms of constant expressions" exception. 3794 // (We never end up here for C++, so the constant expression 3795 // rules there don't matter.) 3796 if (Init->isConstantInitializer(Context)) 3797 return false; 3798 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 3799 << Init->getSourceRange(); 3800 return true; 3801} 3802 3803void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 3804 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 3805} 3806 3807/// AddInitializerToDecl - Adds the initializer Init to the 3808/// declaration dcl. If DirectInit is true, this is C++ direct 3809/// initialization rather than copy initialization. 3810void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 3811 Decl *RealDecl = dcl.getAs<Decl>(); 3812 // If there is no declaration, there was an error parsing it. Just ignore 3813 // the initializer. 3814 if (RealDecl == 0) 3815 return; 3816 3817 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 3818 // With declarators parsed the way they are, the parser cannot 3819 // distinguish between a normal initializer and a pure-specifier. 3820 // Thus this grotesque test. 3821 IntegerLiteral *IL; 3822 Expr *Init = static_cast<Expr *>(init.get()); 3823 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 3824 Context.getCanonicalType(IL->getType()) == Context.IntTy) 3825 CheckPureMethod(Method, Init->getSourceRange()); 3826 else { 3827 Diag(Method->getLocation(), diag::err_member_function_initialization) 3828 << Method->getDeclName() << Init->getSourceRange(); 3829 Method->setInvalidDecl(); 3830 } 3831 return; 3832 } 3833 3834 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3835 if (!VDecl) { 3836 if (getLangOptions().CPlusPlus && 3837 RealDecl->getLexicalDeclContext()->isRecord() && 3838 isa<NamedDecl>(RealDecl)) 3839 Diag(RealDecl->getLocation(), diag::err_member_initialization) 3840 << cast<NamedDecl>(RealDecl)->getDeclName(); 3841 else 3842 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3843 RealDecl->setInvalidDecl(); 3844 return; 3845 } 3846 3847 // A definition must end up with a complete type, which means it must be 3848 // complete with the restriction that an array type might be completed by the 3849 // initializer; note that later code assumes this restriction. 3850 QualType BaseDeclType = VDecl->getType(); 3851 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 3852 BaseDeclType = Array->getElementType(); 3853 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 3854 diag::err_typecheck_decl_incomplete_type)) { 3855 RealDecl->setInvalidDecl(); 3856 return; 3857 } 3858 3859 // The variable can not have an abstract class type. 3860 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 3861 diag::err_abstract_type_in_decl, 3862 AbstractVariableType)) 3863 VDecl->setInvalidDecl(); 3864 3865 const VarDecl *Def; 3866 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 3867 Diag(VDecl->getLocation(), diag::err_redefinition) 3868 << VDecl->getDeclName(); 3869 Diag(Def->getLocation(), diag::note_previous_definition); 3870 VDecl->setInvalidDecl(); 3871 return; 3872 } 3873 3874 // Take ownership of the expression, now that we're sure we have somewhere 3875 // to put it. 3876 Expr *Init = init.takeAs<Expr>(); 3877 assert(Init && "missing initializer"); 3878 3879 // Capture the variable that is being initialized and the style of 3880 // initialization. 3881 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 3882 3883 // FIXME: Poor source location information. 3884 InitializationKind Kind 3885 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 3886 Init->getLocStart(), 3887 Init->getLocEnd()) 3888 : InitializationKind::CreateCopy(VDecl->getLocation(), 3889 Init->getLocStart()); 3890 3891 // Get the decls type and save a reference for later, since 3892 // CheckInitializerTypes may change it. 3893 QualType DclT = VDecl->getType(), SavT = DclT; 3894 if (VDecl->isBlockVarDecl()) { 3895 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 3896 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 3897 VDecl->setInvalidDecl(); 3898 } else if (!VDecl->isInvalidDecl()) { 3899 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3900 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3901 MultiExprArg(*this, (void**)&Init, 1), 3902 &DclT); 3903 if (Result.isInvalid()) { 3904 VDecl->setInvalidDecl(); 3905 return; 3906 } 3907 3908 Init = Result.takeAs<Expr>(); 3909 3910 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3911 // Don't check invalid declarations to avoid emitting useless diagnostics. 3912 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3913 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 3914 CheckForConstantInitializer(Init, DclT); 3915 } 3916 } 3917 } else if (VDecl->isStaticDataMember() && 3918 VDecl->getLexicalDeclContext()->isRecord()) { 3919 // This is an in-class initialization for a static data member, e.g., 3920 // 3921 // struct S { 3922 // static const int value = 17; 3923 // }; 3924 3925 // Attach the initializer 3926 VDecl->setInit(Init); 3927 3928 // C++ [class.mem]p4: 3929 // A member-declarator can contain a constant-initializer only 3930 // if it declares a static member (9.4) of const integral or 3931 // const enumeration type, see 9.4.2. 3932 QualType T = VDecl->getType(); 3933 if (!T->isDependentType() && 3934 (!Context.getCanonicalType(T).isConstQualified() || 3935 !T->isIntegralType())) { 3936 Diag(VDecl->getLocation(), diag::err_member_initialization) 3937 << VDecl->getDeclName() << Init->getSourceRange(); 3938 VDecl->setInvalidDecl(); 3939 } else { 3940 // C++ [class.static.data]p4: 3941 // If a static data member is of const integral or const 3942 // enumeration type, its declaration in the class definition 3943 // can specify a constant-initializer which shall be an 3944 // integral constant expression (5.19). 3945 if (!Init->isTypeDependent() && 3946 !Init->getType()->isIntegralType()) { 3947 // We have a non-dependent, non-integral or enumeration type. 3948 Diag(Init->getSourceRange().getBegin(), 3949 diag::err_in_class_initializer_non_integral_type) 3950 << Init->getType() << Init->getSourceRange(); 3951 VDecl->setInvalidDecl(); 3952 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 3953 // Check whether the expression is a constant expression. 3954 llvm::APSInt Value; 3955 SourceLocation Loc; 3956 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 3957 Diag(Loc, diag::err_in_class_initializer_non_constant) 3958 << Init->getSourceRange(); 3959 VDecl->setInvalidDecl(); 3960 } else if (!VDecl->getType()->isDependentType()) 3961 ImpCastExprToType(Init, VDecl->getType(), CastExpr::CK_IntegralCast); 3962 } 3963 } 3964 } else if (VDecl->isFileVarDecl()) { 3965 if (VDecl->getStorageClass() == VarDecl::Extern && 3966 (!getLangOptions().CPlusPlus || 3967 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 3968 Diag(VDecl->getLocation(), diag::warn_extern_init); 3969 if (!VDecl->isInvalidDecl()) { 3970 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3971 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3972 MultiExprArg(*this, (void**)&Init, 1), 3973 &DclT); 3974 if (Result.isInvalid()) { 3975 VDecl->setInvalidDecl(); 3976 return; 3977 } 3978 3979 Init = Result.takeAs<Expr>(); 3980 } 3981 3982 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3983 // Don't check invalid declarations to avoid emitting useless diagnostics. 3984 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3985 // C99 6.7.8p4. All file scoped initializers need to be constant. 3986 CheckForConstantInitializer(Init, DclT); 3987 } 3988 } 3989 // If the type changed, it means we had an incomplete type that was 3990 // completed by the initializer. For example: 3991 // int ary[] = { 1, 3, 5 }; 3992 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 3993 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 3994 VDecl->setType(DclT); 3995 Init->setType(DclT); 3996 } 3997 3998 Init = MaybeCreateCXXExprWithTemporaries(Init); 3999 // Attach the initializer to the decl. 4000 VDecl->setInit(Init); 4001 4002 if (getLangOptions().CPlusPlus) { 4003 // Make sure we mark the destructor as used if necessary. 4004 QualType InitType = VDecl->getType(); 4005 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 4006 InitType = Context.getBaseElementType(Array); 4007 if (const RecordType *Record = InitType->getAs<RecordType>()) 4008 FinalizeVarWithDestructor(VDecl, Record); 4009 } 4010 4011 return; 4012} 4013 4014/// ActOnInitializerError - Given that there was an error parsing an 4015/// initializer for the given declaration, try to return to some form 4016/// of sanity. 4017void Sema::ActOnInitializerError(DeclPtrTy dcl) { 4018 // Our main concern here is re-establishing invariants like "a 4019 // variable's type is either dependent or complete". 4020 Decl *D = dcl.getAs<Decl>(); 4021 if (!D || D->isInvalidDecl()) return; 4022 4023 VarDecl *VD = dyn_cast<VarDecl>(D); 4024 if (!VD) return; 4025 4026 QualType Ty = VD->getType(); 4027 if (Ty->isDependentType()) return; 4028 4029 // Require a complete type. 4030 if (RequireCompleteType(VD->getLocation(), 4031 Context.getBaseElementType(Ty), 4032 diag::err_typecheck_decl_incomplete_type)) { 4033 VD->setInvalidDecl(); 4034 return; 4035 } 4036 4037 // Require an abstract type. 4038 if (RequireNonAbstractType(VD->getLocation(), Ty, 4039 diag::err_abstract_type_in_decl, 4040 AbstractVariableType)) { 4041 VD->setInvalidDecl(); 4042 return; 4043 } 4044 4045 // Don't bother complaining about constructors or destructors, 4046 // though. 4047} 4048 4049void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 4050 bool TypeContainsUndeducedAuto) { 4051 Decl *RealDecl = dcl.getAs<Decl>(); 4052 4053 // If there is no declaration, there was an error parsing it. Just ignore it. 4054 if (RealDecl == 0) 4055 return; 4056 4057 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 4058 QualType Type = Var->getType(); 4059 4060 // C++0x [dcl.spec.auto]p3 4061 if (TypeContainsUndeducedAuto) { 4062 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 4063 << Var->getDeclName() << Type; 4064 Var->setInvalidDecl(); 4065 return; 4066 } 4067 4068 switch (Var->isThisDeclarationADefinition()) { 4069 case VarDecl::Definition: 4070 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 4071 break; 4072 4073 // We have an out-of-line definition of a static data member 4074 // that has an in-class initializer, so we type-check this like 4075 // a declaration. 4076 // 4077 // Fall through 4078 4079 case VarDecl::DeclarationOnly: 4080 // It's only a declaration. 4081 4082 // Block scope. C99 6.7p7: If an identifier for an object is 4083 // declared with no linkage (C99 6.2.2p6), the type for the 4084 // object shall be complete. 4085 if (!Type->isDependentType() && Var->isBlockVarDecl() && 4086 !Var->getLinkage() && !Var->isInvalidDecl() && 4087 RequireCompleteType(Var->getLocation(), Type, 4088 diag::err_typecheck_decl_incomplete_type)) 4089 Var->setInvalidDecl(); 4090 4091 // Make sure that the type is not abstract. 4092 if (!Type->isDependentType() && !Var->isInvalidDecl() && 4093 RequireNonAbstractType(Var->getLocation(), Type, 4094 diag::err_abstract_type_in_decl, 4095 AbstractVariableType)) 4096 Var->setInvalidDecl(); 4097 return; 4098 4099 case VarDecl::TentativeDefinition: 4100 // File scope. C99 6.9.2p2: A declaration of an identifier for an 4101 // object that has file scope without an initializer, and without a 4102 // storage-class specifier or with the storage-class specifier "static", 4103 // constitutes a tentative definition. Note: A tentative definition with 4104 // external linkage is valid (C99 6.2.2p5). 4105 if (!Var->isInvalidDecl()) { 4106 if (const IncompleteArrayType *ArrayT 4107 = Context.getAsIncompleteArrayType(Type)) { 4108 if (RequireCompleteType(Var->getLocation(), 4109 ArrayT->getElementType(), 4110 diag::err_illegal_decl_array_incomplete_type)) 4111 Var->setInvalidDecl(); 4112 } else if (Var->getStorageClass() == VarDecl::Static) { 4113 // C99 6.9.2p3: If the declaration of an identifier for an object is 4114 // a tentative definition and has internal linkage (C99 6.2.2p3), the 4115 // declared type shall not be an incomplete type. 4116 // NOTE: code such as the following 4117 // static struct s; 4118 // struct s { int a; }; 4119 // is accepted by gcc. Hence here we issue a warning instead of 4120 // an error and we do not invalidate the static declaration. 4121 // NOTE: to avoid multiple warnings, only check the first declaration. 4122 if (Var->getPreviousDeclaration() == 0) 4123 RequireCompleteType(Var->getLocation(), Type, 4124 diag::ext_typecheck_decl_incomplete_type); 4125 } 4126 } 4127 4128 // Record the tentative definition; we're done. 4129 if (!Var->isInvalidDecl()) 4130 TentativeDefinitions.push_back(Var); 4131 return; 4132 } 4133 4134 // Provide a specific diagnostic for uninitialized variable 4135 // definitions with incomplete array type. 4136 if (Type->isIncompleteArrayType()) { 4137 Diag(Var->getLocation(), 4138 diag::err_typecheck_incomplete_array_needs_initializer); 4139 Var->setInvalidDecl(); 4140 return; 4141 } 4142 4143 // Provide a specific diagnostic for uninitialized variable 4144 // definitions with reference type. 4145 if (Type->isReferenceType()) { 4146 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 4147 << Var->getDeclName() 4148 << SourceRange(Var->getLocation(), Var->getLocation()); 4149 Var->setInvalidDecl(); 4150 return; 4151 } 4152 4153 // Do not attempt to type-check the default initializer for a 4154 // variable with dependent type. 4155 if (Type->isDependentType()) 4156 return; 4157 4158 if (Var->isInvalidDecl()) 4159 return; 4160 4161 if (RequireCompleteType(Var->getLocation(), 4162 Context.getBaseElementType(Type), 4163 diag::err_typecheck_decl_incomplete_type)) { 4164 Var->setInvalidDecl(); 4165 return; 4166 } 4167 4168 // The variable can not have an abstract class type. 4169 if (RequireNonAbstractType(Var->getLocation(), Type, 4170 diag::err_abstract_type_in_decl, 4171 AbstractVariableType)) { 4172 Var->setInvalidDecl(); 4173 return; 4174 } 4175 4176 const RecordType *Record 4177 = Context.getBaseElementType(Type)->getAs<RecordType>(); 4178 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 4179 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 4180 // C++03 [dcl.init]p9: 4181 // If no initializer is specified for an object, and the 4182 // object is of (possibly cv-qualified) non-POD class type (or 4183 // array thereof), the object shall be default-initialized; if 4184 // the object is of const-qualified type, the underlying class 4185 // type shall have a user-declared default 4186 // constructor. Otherwise, if no initializer is specified for 4187 // a non- static object, the object and its subobjects, if 4188 // any, have an indeterminate initial value); if the object 4189 // or any of its subobjects are of const-qualified type, the 4190 // program is ill-formed. 4191 // FIXME: DPG thinks it is very fishy that C++0x disables this. 4192 } else { 4193 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 4194 InitializationKind Kind 4195 = InitializationKind::CreateDefault(Var->getLocation()); 4196 4197 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 4198 OwningExprResult Init = InitSeq.Perform(*this, Entity, Kind, 4199 MultiExprArg(*this, 0, 0)); 4200 if (Init.isInvalid()) 4201 Var->setInvalidDecl(); 4202 else if (Init.get()) 4203 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 4204 } 4205 4206 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record) 4207 FinalizeVarWithDestructor(Var, Record); 4208 } 4209} 4210 4211Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 4212 DeclPtrTy *Group, 4213 unsigned NumDecls) { 4214 llvm::SmallVector<Decl*, 8> Decls; 4215 4216 if (DS.isTypeSpecOwned()) 4217 Decls.push_back((Decl*)DS.getTypeRep()); 4218 4219 for (unsigned i = 0; i != NumDecls; ++i) 4220 if (Decl *D = Group[i].getAs<Decl>()) 4221 Decls.push_back(D); 4222 4223 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 4224 Decls.data(), Decls.size())); 4225} 4226 4227 4228/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 4229/// to introduce parameters into function prototype scope. 4230Sema::DeclPtrTy 4231Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 4232 const DeclSpec &DS = D.getDeclSpec(); 4233 4234 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 4235 VarDecl::StorageClass StorageClass = VarDecl::None; 4236 VarDecl::StorageClass StorageClassAsWritten = VarDecl::None; 4237 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 4238 StorageClass = VarDecl::Register; 4239 StorageClassAsWritten = VarDecl::Register; 4240 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 4241 Diag(DS.getStorageClassSpecLoc(), 4242 diag::err_invalid_storage_class_in_func_decl); 4243 D.getMutableDeclSpec().ClearStorageClassSpecs(); 4244 } 4245 4246 if (D.getDeclSpec().isThreadSpecified()) 4247 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4248 4249 DiagnoseFunctionSpecifiers(D); 4250 4251 // Check that there are no default arguments inside the type of this 4252 // parameter (C++ only). 4253 if (getLangOptions().CPlusPlus) 4254 CheckExtraCXXDefaultArguments(D); 4255 4256 TagDecl *OwnedDecl = 0; 4257 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 4258 QualType parmDeclType = TInfo->getType(); 4259 4260 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 4261 // C++ [dcl.fct]p6: 4262 // Types shall not be defined in return or parameter types. 4263 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 4264 << Context.getTypeDeclType(OwnedDecl); 4265 } 4266 4267 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 4268 IdentifierInfo *II = D.getIdentifier(); 4269 if (II) { 4270 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 4271 ForRedeclaration); 4272 LookupName(R, S); 4273 if (R.isSingleResult()) { 4274 NamedDecl *PrevDecl = R.getFoundDecl(); 4275 if (PrevDecl->isTemplateParameter()) { 4276 // Maybe we will complain about the shadowed template parameter. 4277 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4278 // Just pretend that we didn't see the previous declaration. 4279 PrevDecl = 0; 4280 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 4281 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 4282 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4283 4284 // Recover by removing the name 4285 II = 0; 4286 D.SetIdentifier(0, D.getIdentifierLoc()); 4287 D.setInvalidType(true); 4288 } 4289 } 4290 } 4291 4292 // Temporarily put parameter variables in the translation unit, not 4293 // the enclosing context. This prevents them from accidentally 4294 // looking like class members in C++. 4295 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 4296 TInfo, parmDeclType, II, 4297 D.getIdentifierLoc(), 4298 StorageClass, StorageClassAsWritten); 4299 4300 if (D.isInvalidType()) 4301 New->setInvalidDecl(); 4302 4303 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 4304 if (D.getCXXScopeSpec().isSet()) { 4305 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 4306 << D.getCXXScopeSpec().getRange(); 4307 New->setInvalidDecl(); 4308 } 4309 4310 // Add the parameter declaration into this scope. 4311 S->AddDecl(DeclPtrTy::make(New)); 4312 if (II) 4313 IdResolver.AddDecl(New); 4314 4315 ProcessDeclAttributes(S, New, D); 4316 4317 if (New->hasAttr<BlocksAttr>()) { 4318 Diag(New->getLocation(), diag::err_block_on_nonlocal); 4319 } 4320 return DeclPtrTy::make(New); 4321} 4322 4323/// \brief Synthesizes a variable for a parameter arising from a 4324/// typedef. 4325ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 4326 SourceLocation Loc, 4327 QualType T) { 4328 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, 0, 4329 T, Context.getTrivialTypeSourceInfo(T, Loc), 4330 VarDecl::None, VarDecl::None, 0); 4331 Param->setImplicit(); 4332 return Param; 4333} 4334 4335ParmVarDecl *Sema::CheckParameter(DeclContext *DC, 4336 TypeSourceInfo *TSInfo, QualType T, 4337 IdentifierInfo *Name, 4338 SourceLocation NameLoc, 4339 VarDecl::StorageClass StorageClass, 4340 VarDecl::StorageClass StorageClassAsWritten) { 4341 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, NameLoc, Name, 4342 adjustParameterType(T), TSInfo, 4343 StorageClass, StorageClassAsWritten, 4344 0); 4345 4346 // Parameters can not be abstract class types. 4347 // For record types, this is done by the AbstractClassUsageDiagnoser once 4348 // the class has been completely parsed. 4349 if (!CurContext->isRecord() && 4350 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 4351 AbstractParamType)) 4352 New->setInvalidDecl(); 4353 4354 // Parameter declarators cannot be interface types. All ObjC objects are 4355 // passed by reference. 4356 if (T->isObjCObjectType()) { 4357 Diag(NameLoc, 4358 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 4359 New->setInvalidDecl(); 4360 } 4361 4362 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 4363 // duration shall not be qualified by an address-space qualifier." 4364 // Since all parameters have automatic store duration, they can not have 4365 // an address space. 4366 if (T.getAddressSpace() != 0) { 4367 Diag(NameLoc, diag::err_arg_with_address_space); 4368 New->setInvalidDecl(); 4369 } 4370 4371 return New; 4372} 4373 4374void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 4375 SourceLocation LocAfterDecls) { 4376 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4377 "Not a function declarator!"); 4378 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4379 4380 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 4381 // for a K&R function. 4382 if (!FTI.hasPrototype) { 4383 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 4384 --i; 4385 if (FTI.ArgInfo[i].Param == 0) { 4386 llvm::SmallString<256> Code; 4387 llvm::raw_svector_ostream(Code) << " int " 4388 << FTI.ArgInfo[i].Ident->getName() 4389 << ";\n"; 4390 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 4391 << FTI.ArgInfo[i].Ident 4392 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 4393 4394 // Implicitly declare the argument as type 'int' for lack of a better 4395 // type. 4396 DeclSpec DS; 4397 const char* PrevSpec; // unused 4398 unsigned DiagID; // unused 4399 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 4400 PrevSpec, DiagID); 4401 Declarator ParamD(DS, Declarator::KNRTypeListContext); 4402 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 4403 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 4404 } 4405 } 4406 } 4407} 4408 4409Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 4410 Declarator &D) { 4411 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 4412 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4413 "Not a function declarator!"); 4414 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4415 4416 if (FTI.hasPrototype) { 4417 // FIXME: Diagnose arguments without names in C. 4418 } 4419 4420 Scope *ParentScope = FnBodyScope->getParent(); 4421 4422 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 4423 MultiTemplateParamsArg(*this), 4424 /*IsFunctionDefinition=*/true); 4425 return ActOnStartOfFunctionDef(FnBodyScope, DP); 4426} 4427 4428static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 4429 // Don't warn about invalid declarations. 4430 if (FD->isInvalidDecl()) 4431 return false; 4432 4433 // Or declarations that aren't global. 4434 if (!FD->isGlobal()) 4435 return false; 4436 4437 // Don't warn about C++ member functions. 4438 if (isa<CXXMethodDecl>(FD)) 4439 return false; 4440 4441 // Don't warn about 'main'. 4442 if (FD->isMain()) 4443 return false; 4444 4445 // Don't warn about inline functions. 4446 if (FD->isInlineSpecified()) 4447 return false; 4448 4449 // Don't warn about function templates. 4450 if (FD->getDescribedFunctionTemplate()) 4451 return false; 4452 4453 // Don't warn about function template specializations. 4454 if (FD->isFunctionTemplateSpecialization()) 4455 return false; 4456 4457 bool MissingPrototype = true; 4458 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4459 Prev; Prev = Prev->getPreviousDeclaration()) { 4460 // Ignore any declarations that occur in function or method 4461 // scope, because they aren't visible from the header. 4462 if (Prev->getDeclContext()->isFunctionOrMethod()) 4463 continue; 4464 4465 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4466 break; 4467 } 4468 4469 return MissingPrototype; 4470} 4471 4472Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 4473 // Clear the last template instantiation error context. 4474 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4475 4476 if (!D) 4477 return D; 4478 FunctionDecl *FD = 0; 4479 4480 if (FunctionTemplateDecl *FunTmpl 4481 = dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>())) 4482 FD = FunTmpl->getTemplatedDecl(); 4483 else 4484 FD = cast<FunctionDecl>(D.getAs<Decl>()); 4485 4486 // Enter a new function scope 4487 PushFunctionScope(); 4488 4489 // See if this is a redefinition. 4490 // But don't complain if we're in GNU89 mode and the previous definition 4491 // was an extern inline function. 4492 const FunctionDecl *Definition; 4493 if (FD->getBody(Definition) && 4494 !canRedefineFunction(Definition, getLangOptions())) { 4495 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4496 Diag(Definition->getLocation(), diag::note_previous_definition); 4497 } 4498 4499 // Builtin functions cannot be defined. 4500 if (unsigned BuiltinID = FD->getBuiltinID()) { 4501 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4502 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4503 FD->setInvalidDecl(); 4504 } 4505 } 4506 4507 // The return type of a function definition must be complete 4508 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4509 QualType ResultType = FD->getResultType(); 4510 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4511 !FD->isInvalidDecl() && 4512 RequireCompleteType(FD->getLocation(), ResultType, 4513 diag::err_func_def_incomplete_result)) 4514 FD->setInvalidDecl(); 4515 4516 // GNU warning -Wmissing-prototypes: 4517 // Warn if a global function is defined without a previous 4518 // prototype declaration. This warning is issued even if the 4519 // definition itself provides a prototype. The aim is to detect 4520 // global functions that fail to be declared in header files. 4521 if (ShouldWarnAboutMissingPrototype(FD)) 4522 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4523 4524 if (FnBodyScope) 4525 PushDeclContext(FnBodyScope, FD); 4526 4527 // Check the validity of our function parameters 4528 CheckParmsForFunctionDef(FD); 4529 4530 bool ShouldCheckShadow = 4531 Diags.getDiagnosticLevel(diag::warn_decl_shadow) != Diagnostic::Ignored; 4532 4533 // Introduce our parameters into the function scope 4534 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4535 ParmVarDecl *Param = FD->getParamDecl(p); 4536 Param->setOwningFunction(FD); 4537 4538 // If this has an identifier, add it to the scope stack. 4539 if (Param->getIdentifier() && FnBodyScope) { 4540 if (ShouldCheckShadow) 4541 CheckShadow(FnBodyScope, Param); 4542 4543 PushOnScopeChains(Param, FnBodyScope); 4544 } 4545 } 4546 4547 // Checking attributes of current function definition 4548 // dllimport attribute. 4549 if (FD->getAttr<DLLImportAttr>() && 4550 (!FD->getAttr<DLLExportAttr>())) { 4551 // dllimport attribute cannot be applied to definition. 4552 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 4553 Diag(FD->getLocation(), 4554 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4555 << "dllimport"; 4556 FD->setInvalidDecl(); 4557 return DeclPtrTy::make(FD); 4558 } 4559 4560 // Visual C++ appears to not think this is an issue, so only issue 4561 // a warning when Microsoft extensions are disabled. 4562 if (!LangOpts.Microsoft) { 4563 // If a symbol previously declared dllimport is later defined, the 4564 // attribute is ignored in subsequent references, and a warning is 4565 // emitted. 4566 Diag(FD->getLocation(), 4567 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4568 << FD->getNameAsCString() << "dllimport"; 4569 } 4570 } 4571 return DeclPtrTy::make(FD); 4572} 4573 4574/// \brief Given the set of return statements within a function body, 4575/// compute the variables that are subject to the named return value 4576/// optimization. 4577/// 4578/// Each of the variables that is subject to the named return value 4579/// optimization will be marked as NRVO variables in the AST, and any 4580/// return statement that has a marked NRVO variable as its NRVO candidate can 4581/// use the named return value optimization. 4582/// 4583/// This function applies a very simplistic algorithm for NRVO: if every return 4584/// statement in the function has the same NRVO candidate, that candidate is 4585/// the NRVO variable. 4586/// 4587/// FIXME: Employ a smarter algorithm that accounts for multiple return 4588/// statements and the lifetimes of the NRVO candidates. We should be able to 4589/// find a maximal set of NRVO variables. 4590static void ComputeNRVO(Stmt *Body, ReturnStmt **Returns, unsigned NumReturns) { 4591 const VarDecl *NRVOCandidate = 0; 4592 for (unsigned I = 0; I != NumReturns; ++I) { 4593 if (!Returns[I]->getNRVOCandidate()) 4594 return; 4595 4596 if (!NRVOCandidate) 4597 NRVOCandidate = Returns[I]->getNRVOCandidate(); 4598 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 4599 return; 4600 } 4601 4602 if (NRVOCandidate) 4603 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 4604} 4605 4606Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 4607 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4608} 4609 4610Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 4611 bool IsInstantiation) { 4612 Decl *dcl = D.getAs<Decl>(); 4613 Stmt *Body = BodyArg.takeAs<Stmt>(); 4614 4615 FunctionDecl *FD = 0; 4616 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4617 if (FunTmpl) 4618 FD = FunTmpl->getTemplatedDecl(); 4619 else 4620 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4621 4622 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 4623 4624 if (FD) { 4625 FD->setBody(Body); 4626 if (FD->isMain()) { 4627 // C and C++ allow for main to automagically return 0. 4628 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 4629 FD->setHasImplicitReturnZero(true); 4630 WP.disableCheckFallThrough(); 4631 } 4632 4633 if (!FD->isInvalidDecl()) { 4634 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 4635 4636 // If this is a constructor, we need a vtable. 4637 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 4638 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 4639 4640 ComputeNRVO(Body, FunctionScopes.back()->Returns.data(), 4641 FunctionScopes.back()->Returns.size()); 4642 } 4643 4644 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 4645 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 4646 assert(MD == getCurMethodDecl() && "Method parsing confused"); 4647 MD->setBody(Body); 4648 MD->setEndLoc(Body->getLocEnd()); 4649 if (!MD->isInvalidDecl()) 4650 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 4651 } else { 4652 Body->Destroy(Context); 4653 return DeclPtrTy(); 4654 } 4655 4656 // Verify and clean out per-function state. 4657 4658 // Check goto/label use. 4659 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 4660 I = getLabelMap().begin(), E = getLabelMap().end(); I != E; ++I) { 4661 LabelStmt *L = I->second; 4662 4663 // Verify that we have no forward references left. If so, there was a goto 4664 // or address of a label taken, but no definition of it. Label fwd 4665 // definitions are indicated with a null substmt. 4666 if (L->getSubStmt() != 0) 4667 continue; 4668 4669 // Emit error. 4670 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 4671 4672 // At this point, we have gotos that use the bogus label. Stitch it into 4673 // the function body so that they aren't leaked and that the AST is well 4674 // formed. 4675 if (Body == 0) { 4676 // The whole function wasn't parsed correctly, just delete this. 4677 L->Destroy(Context); 4678 continue; 4679 } 4680 4681 // Otherwise, the body is valid: we want to stitch the label decl into the 4682 // function somewhere so that it is properly owned and so that the goto 4683 // has a valid target. Do this by creating a new compound stmt with the 4684 // label in it. 4685 4686 // Give the label a sub-statement. 4687 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 4688 4689 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 4690 cast<CXXTryStmt>(Body)->getTryBlock() : 4691 cast<CompoundStmt>(Body); 4692 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(), 4693 Compound->body_end()); 4694 Elements.push_back(L); 4695 Compound->setStmts(Context, Elements.data(), Elements.size()); 4696 } 4697 4698 if (Body) { 4699 // C++ constructors that have function-try-blocks can't have return 4700 // statements in the handlers of that block. (C++ [except.handle]p14) 4701 // Verify this. 4702 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 4703 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 4704 4705 // Verify that that gotos and switch cases don't jump into scopes illegally. 4706 // Verify that that gotos and switch cases don't jump into scopes illegally. 4707 if (FunctionNeedsScopeChecking() && 4708 !dcl->isInvalidDecl() && 4709 !hasAnyErrorsInThisFunction()) 4710 DiagnoseInvalidJumps(Body); 4711 4712 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 4713 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4714 Destructor->getParent()); 4715 4716 // If any errors have occurred, clear out any temporaries that may have 4717 // been leftover. This ensures that these temporaries won't be picked up for 4718 // deletion in some later function. 4719 if (PP.getDiagnostics().hasErrorOccurred()) 4720 ExprTemporaries.clear(); 4721 else if (!isa<FunctionTemplateDecl>(dcl)) { 4722 // Since the body is valid, issue any analysis-based warnings that are 4723 // enabled. 4724 QualType ResultType; 4725 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 4726 ResultType = FD->getResultType(); 4727 } 4728 else { 4729 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl); 4730 ResultType = MD->getResultType(); 4731 } 4732 AnalysisWarnings.IssueWarnings(WP, dcl); 4733 } 4734 4735 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 4736 } 4737 4738 if (!IsInstantiation) 4739 PopDeclContext(); 4740 4741 PopFunctionOrBlockScope(); 4742 4743 // If any errors have occurred, clear out any temporaries that may have 4744 // been leftover. This ensures that these temporaries won't be picked up for 4745 // deletion in some later function. 4746 if (getDiagnostics().hasErrorOccurred()) 4747 ExprTemporaries.clear(); 4748 4749 return D; 4750} 4751 4752/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 4753/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 4754NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 4755 IdentifierInfo &II, Scope *S) { 4756 // Before we produce a declaration for an implicitly defined 4757 // function, see whether there was a locally-scoped declaration of 4758 // this name as a function or variable. If so, use that 4759 // (non-visible) declaration, and complain about it. 4760 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4761 = LocallyScopedExternalDecls.find(&II); 4762 if (Pos != LocallyScopedExternalDecls.end()) { 4763 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 4764 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 4765 return Pos->second; 4766 } 4767 4768 // Extension in C99. Legal in C90, but warn about it. 4769 if (II.getName().startswith("__builtin_")) 4770 Diag(Loc, diag::warn_builtin_unknown) << &II; 4771 else if (getLangOptions().C99) 4772 Diag(Loc, diag::ext_implicit_function_decl) << &II; 4773 else 4774 Diag(Loc, diag::warn_implicit_function_decl) << &II; 4775 4776 // Set a Declarator for the implicit definition: int foo(); 4777 const char *Dummy; 4778 DeclSpec DS; 4779 unsigned DiagID; 4780 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 4781 Error = Error; // Silence warning. 4782 assert(!Error && "Error setting up implicit decl!"); 4783 Declarator D(DS, Declarator::BlockContext); 4784 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 4785 0, 0, false, SourceLocation(), 4786 false, 0,0,0, Loc, Loc, D), 4787 SourceLocation()); 4788 D.SetIdentifier(&II, Loc); 4789 4790 // Insert this function into translation-unit scope. 4791 4792 DeclContext *PrevDC = CurContext; 4793 CurContext = Context.getTranslationUnitDecl(); 4794 4795 FunctionDecl *FD = 4796 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 4797 FD->setImplicit(); 4798 4799 CurContext = PrevDC; 4800 4801 AddKnownFunctionAttributes(FD); 4802 4803 return FD; 4804} 4805 4806/// \brief Adds any function attributes that we know a priori based on 4807/// the declaration of this function. 4808/// 4809/// These attributes can apply both to implicitly-declared builtins 4810/// (like __builtin___printf_chk) or to library-declared functions 4811/// like NSLog or printf. 4812void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 4813 if (FD->isInvalidDecl()) 4814 return; 4815 4816 // If this is a built-in function, map its builtin attributes to 4817 // actual attributes. 4818 if (unsigned BuiltinID = FD->getBuiltinID()) { 4819 // Handle printf-formatting attributes. 4820 unsigned FormatIdx; 4821 bool HasVAListArg; 4822 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 4823 if (!FD->getAttr<FormatAttr>()) 4824 FD->addAttr(::new (Context) FormatAttr(Context, "printf", FormatIdx+1, 4825 HasVAListArg ? 0 : FormatIdx+2)); 4826 } 4827 4828 // Mark const if we don't care about errno and that is the only 4829 // thing preventing the function from being const. This allows 4830 // IRgen to use LLVM intrinsics for such functions. 4831 if (!getLangOptions().MathErrno && 4832 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 4833 if (!FD->getAttr<ConstAttr>()) 4834 FD->addAttr(::new (Context) ConstAttr()); 4835 } 4836 4837 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 4838 FD->setType(Context.getNoReturnType(FD->getType())); 4839 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 4840 FD->addAttr(::new (Context) NoThrowAttr()); 4841 if (Context.BuiltinInfo.isConst(BuiltinID)) 4842 FD->addAttr(::new (Context) ConstAttr()); 4843 } 4844 4845 IdentifierInfo *Name = FD->getIdentifier(); 4846 if (!Name) 4847 return; 4848 if ((!getLangOptions().CPlusPlus && 4849 FD->getDeclContext()->isTranslationUnit()) || 4850 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 4851 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 4852 LinkageSpecDecl::lang_c)) { 4853 // Okay: this could be a libc/libm/Objective-C function we know 4854 // about. 4855 } else 4856 return; 4857 4858 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 4859 // FIXME: NSLog and NSLogv should be target specific 4860 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 4861 // FIXME: We known better than our headers. 4862 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 4863 } else 4864 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 1, 4865 Name->isStr("NSLogv") ? 0 : 2)); 4866 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 4867 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 4868 // target-specific builtins, perhaps? 4869 if (!FD->getAttr<FormatAttr>()) 4870 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 2, 4871 Name->isStr("vasprintf") ? 0 : 3)); 4872 } 4873} 4874 4875TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 4876 TypeSourceInfo *TInfo) { 4877 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 4878 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 4879 4880 if (!TInfo) { 4881 assert(D.isInvalidType() && "no declarator info for valid type"); 4882 TInfo = Context.getTrivialTypeSourceInfo(T); 4883 } 4884 4885 // Scope manipulation handled by caller. 4886 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 4887 D.getIdentifierLoc(), 4888 D.getIdentifier(), 4889 TInfo); 4890 4891 if (const TagType *TT = T->getAs<TagType>()) { 4892 TagDecl *TD = TT->getDecl(); 4893 4894 // If the TagDecl that the TypedefDecl points to is an anonymous decl 4895 // keep track of the TypedefDecl. 4896 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 4897 TD->setTypedefForAnonDecl(NewTD); 4898 } 4899 4900 if (D.isInvalidType()) 4901 NewTD->setInvalidDecl(); 4902 return NewTD; 4903} 4904 4905 4906/// \brief Determine whether a tag with a given kind is acceptable 4907/// as a redeclaration of the given tag declaration. 4908/// 4909/// \returns true if the new tag kind is acceptable, false otherwise. 4910bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 4911 TagTypeKind NewTag, 4912 SourceLocation NewTagLoc, 4913 const IdentifierInfo &Name) { 4914 // C++ [dcl.type.elab]p3: 4915 // The class-key or enum keyword present in the 4916 // elaborated-type-specifier shall agree in kind with the 4917 // declaration to which the name in the elaborated-type-specifier 4918 // refers. This rule also applies to the form of 4919 // elaborated-type-specifier that declares a class-name or 4920 // friend class since it can be construed as referring to the 4921 // definition of the class. Thus, in any 4922 // elaborated-type-specifier, the enum keyword shall be used to 4923 // refer to an enumeration (7.2), the union class-key shall be 4924 // used to refer to a union (clause 9), and either the class or 4925 // struct class-key shall be used to refer to a class (clause 9) 4926 // declared using the class or struct class-key. 4927 TagTypeKind OldTag = Previous->getTagKind(); 4928 if (OldTag == NewTag) 4929 return true; 4930 4931 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 4932 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 4933 // Warn about the struct/class tag mismatch. 4934 bool isTemplate = false; 4935 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 4936 isTemplate = Record->getDescribedClassTemplate(); 4937 4938 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 4939 << (NewTag == TTK_Class) 4940 << isTemplate << &Name 4941 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 4942 OldTag == TTK_Class? "class" : "struct"); 4943 Diag(Previous->getLocation(), diag::note_previous_use); 4944 return true; 4945 } 4946 return false; 4947} 4948 4949/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 4950/// former case, Name will be non-null. In the later case, Name will be null. 4951/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 4952/// reference/declaration/definition of a tag. 4953Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 4954 SourceLocation KWLoc, CXXScopeSpec &SS, 4955 IdentifierInfo *Name, SourceLocation NameLoc, 4956 AttributeList *Attr, AccessSpecifier AS, 4957 MultiTemplateParamsArg TemplateParameterLists, 4958 bool &OwnedDecl, bool &IsDependent) { 4959 // If this is not a definition, it must have a name. 4960 assert((Name != 0 || TUK == TUK_Definition) && 4961 "Nameless record must be a definition!"); 4962 4963 OwnedDecl = false; 4964 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 4965 4966 // FIXME: Check explicit specializations more carefully. 4967 bool isExplicitSpecialization = false; 4968 if (TUK != TUK_Reference) { 4969 if (TemplateParameterList *TemplateParams 4970 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 4971 (TemplateParameterList**)TemplateParameterLists.get(), 4972 TemplateParameterLists.size(), 4973 TUK == TUK_Friend, 4974 isExplicitSpecialization)) { 4975 if (TemplateParams->size() > 0) { 4976 // This is a declaration or definition of a class template (which may 4977 // be a member of another template). 4978 OwnedDecl = false; 4979 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 4980 SS, Name, NameLoc, Attr, 4981 TemplateParams, 4982 AS); 4983 TemplateParameterLists.release(); 4984 return Result.get(); 4985 } else { 4986 // The "template<>" header is extraneous. 4987 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 4988 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 4989 isExplicitSpecialization = true; 4990 } 4991 } 4992 4993 TemplateParameterLists.release(); 4994 } 4995 4996 DeclContext *SearchDC = CurContext; 4997 DeclContext *DC = CurContext; 4998 bool isStdBadAlloc = false; 4999 bool Invalid = false; 5000 5001 RedeclarationKind Redecl = ForRedeclaration; 5002 if (TUK == TUK_Friend || TUK == TUK_Reference) 5003 Redecl = NotForRedeclaration; 5004 5005 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 5006 5007 if (Name && SS.isNotEmpty()) { 5008 // We have a nested-name tag ('struct foo::bar'). 5009 5010 // Check for invalid 'foo::'. 5011 if (SS.isInvalid()) { 5012 Name = 0; 5013 goto CreateNewDecl; 5014 } 5015 5016 // If this is a friend or a reference to a class in a dependent 5017 // context, don't try to make a decl for it. 5018 if (TUK == TUK_Friend || TUK == TUK_Reference) { 5019 DC = computeDeclContext(SS, false); 5020 if (!DC) { 5021 IsDependent = true; 5022 return DeclPtrTy(); 5023 } 5024 } else { 5025 DC = computeDeclContext(SS, true); 5026 if (!DC) { 5027 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 5028 << SS.getRange(); 5029 return DeclPtrTy(); 5030 } 5031 } 5032 5033 if (RequireCompleteDeclContext(SS, DC)) 5034 return DeclPtrTy::make((Decl *)0); 5035 5036 SearchDC = DC; 5037 // Look-up name inside 'foo::'. 5038 LookupQualifiedName(Previous, DC); 5039 5040 if (Previous.isAmbiguous()) 5041 return DeclPtrTy(); 5042 5043 if (Previous.empty()) { 5044 // Name lookup did not find anything. However, if the 5045 // nested-name-specifier refers to the current instantiation, 5046 // and that current instantiation has any dependent base 5047 // classes, we might find something at instantiation time: treat 5048 // this as a dependent elaborated-type-specifier. 5049 if (Previous.wasNotFoundInCurrentInstantiation()) { 5050 IsDependent = true; 5051 return DeclPtrTy(); 5052 } 5053 5054 // A tag 'foo::bar' must already exist. 5055 Diag(NameLoc, diag::err_not_tag_in_scope) 5056 << Kind << Name << DC << SS.getRange(); 5057 Name = 0; 5058 Invalid = true; 5059 goto CreateNewDecl; 5060 } 5061 } else if (Name) { 5062 // If this is a named struct, check to see if there was a previous forward 5063 // declaration or definition. 5064 // FIXME: We're looking into outer scopes here, even when we 5065 // shouldn't be. Doing so can result in ambiguities that we 5066 // shouldn't be diagnosing. 5067 LookupName(Previous, S); 5068 5069 // Note: there used to be some attempt at recovery here. 5070 if (Previous.isAmbiguous()) 5071 return DeclPtrTy(); 5072 5073 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 5074 // FIXME: This makes sure that we ignore the contexts associated 5075 // with C structs, unions, and enums when looking for a matching 5076 // tag declaration or definition. See the similar lookup tweak 5077 // in Sema::LookupName; is there a better way to deal with this? 5078 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 5079 SearchDC = SearchDC->getParent(); 5080 } 5081 } 5082 5083 if (Previous.isSingleResult() && 5084 Previous.getFoundDecl()->isTemplateParameter()) { 5085 // Maybe we will complain about the shadowed template parameter. 5086 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 5087 // Just pretend that we didn't see the previous declaration. 5088 Previous.clear(); 5089 } 5090 5091 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 5092 DC->Equals(StdNamespace) && Name->isStr("bad_alloc")) { 5093 // This is a declaration of or a reference to "std::bad_alloc". 5094 isStdBadAlloc = true; 5095 5096 if (Previous.empty() && StdBadAlloc) { 5097 // std::bad_alloc has been implicitly declared (but made invisible to 5098 // name lookup). Fill in this implicit declaration as the previous 5099 // declaration, so that the declarations get chained appropriately. 5100 Previous.addDecl(StdBadAlloc); 5101 } 5102 } 5103 5104 // If we didn't find a previous declaration, and this is a reference 5105 // (or friend reference), move to the correct scope. In C++, we 5106 // also need to do a redeclaration lookup there, just in case 5107 // there's a shadow friend decl. 5108 if (Name && Previous.empty() && 5109 (TUK == TUK_Reference || TUK == TUK_Friend)) { 5110 if (Invalid) goto CreateNewDecl; 5111 assert(SS.isEmpty()); 5112 5113 if (TUK == TUK_Reference) { 5114 // C++ [basic.scope.pdecl]p5: 5115 // -- for an elaborated-type-specifier of the form 5116 // 5117 // class-key identifier 5118 // 5119 // if the elaborated-type-specifier is used in the 5120 // decl-specifier-seq or parameter-declaration-clause of a 5121 // function defined in namespace scope, the identifier is 5122 // declared as a class-name in the namespace that contains 5123 // the declaration; otherwise, except as a friend 5124 // declaration, the identifier is declared in the smallest 5125 // non-class, non-function-prototype scope that contains the 5126 // declaration. 5127 // 5128 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 5129 // C structs and unions. 5130 // 5131 // It is an error in C++ to declare (rather than define) an enum 5132 // type, including via an elaborated type specifier. We'll 5133 // diagnose that later; for now, declare the enum in the same 5134 // scope as we would have picked for any other tag type. 5135 // 5136 // GNU C also supports this behavior as part of its incomplete 5137 // enum types extension, while GNU C++ does not. 5138 // 5139 // Find the context where we'll be declaring the tag. 5140 // FIXME: We would like to maintain the current DeclContext as the 5141 // lexical context, 5142 while (SearchDC->isRecord()) 5143 SearchDC = SearchDC->getParent(); 5144 5145 // Find the scope where we'll be declaring the tag. 5146 while (S->isClassScope() || 5147 (getLangOptions().CPlusPlus && 5148 S->isFunctionPrototypeScope()) || 5149 ((S->getFlags() & Scope::DeclScope) == 0) || 5150 (S->getEntity() && 5151 ((DeclContext *)S->getEntity())->isTransparentContext())) 5152 S = S->getParent(); 5153 } else { 5154 assert(TUK == TUK_Friend); 5155 // C++ [namespace.memdef]p3: 5156 // If a friend declaration in a non-local class first declares a 5157 // class or function, the friend class or function is a member of 5158 // the innermost enclosing namespace. 5159 SearchDC = SearchDC->getEnclosingNamespaceContext(); 5160 } 5161 5162 // In C++, we need to do a redeclaration lookup to properly 5163 // diagnose some problems. 5164 if (getLangOptions().CPlusPlus) { 5165 Previous.setRedeclarationKind(ForRedeclaration); 5166 LookupQualifiedName(Previous, SearchDC); 5167 } 5168 } 5169 5170 if (!Previous.empty()) { 5171 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 5172 5173 // It's okay to have a tag decl in the same scope as a typedef 5174 // which hides a tag decl in the same scope. Finding this 5175 // insanity with a redeclaration lookup can only actually happen 5176 // in C++. 5177 // 5178 // This is also okay for elaborated-type-specifiers, which is 5179 // technically forbidden by the current standard but which is 5180 // okay according to the likely resolution of an open issue; 5181 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 5182 if (getLangOptions().CPlusPlus) { 5183 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(PrevDecl)) { 5184 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 5185 TagDecl *Tag = TT->getDecl(); 5186 if (Tag->getDeclName() == Name && 5187 Tag->getDeclContext()->getLookupContext() 5188 ->Equals(TD->getDeclContext()->getLookupContext())) { 5189 PrevDecl = Tag; 5190 Previous.clear(); 5191 Previous.addDecl(Tag); 5192 } 5193 } 5194 } 5195 } 5196 5197 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 5198 // If this is a use of a previous tag, or if the tag is already declared 5199 // in the same scope (so that the definition/declaration completes or 5200 // rementions the tag), reuse the decl. 5201 if (TUK == TUK_Reference || TUK == TUK_Friend || 5202 isDeclInScope(PrevDecl, SearchDC, S)) { 5203 // Make sure that this wasn't declared as an enum and now used as a 5204 // struct or something similar. 5205 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 5206 bool SafeToContinue 5207 = (PrevTagDecl->getTagKind() != TTK_Enum && 5208 Kind != TTK_Enum); 5209 if (SafeToContinue) 5210 Diag(KWLoc, diag::err_use_with_wrong_tag) 5211 << Name 5212 << FixItHint::CreateReplacement(SourceRange(KWLoc), 5213 PrevTagDecl->getKindName()); 5214 else 5215 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 5216 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 5217 5218 if (SafeToContinue) 5219 Kind = PrevTagDecl->getTagKind(); 5220 else { 5221 // Recover by making this an anonymous redefinition. 5222 Name = 0; 5223 Previous.clear(); 5224 Invalid = true; 5225 } 5226 } 5227 5228 if (!Invalid) { 5229 // If this is a use, just return the declaration we found. 5230 5231 // FIXME: In the future, return a variant or some other clue 5232 // for the consumer of this Decl to know it doesn't own it. 5233 // For our current ASTs this shouldn't be a problem, but will 5234 // need to be changed with DeclGroups. 5235 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) || 5236 TUK == TUK_Friend) 5237 return DeclPtrTy::make(PrevTagDecl); 5238 5239 // Diagnose attempts to redefine a tag. 5240 if (TUK == TUK_Definition) { 5241 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 5242 // If we're defining a specialization and the previous definition 5243 // is from an implicit instantiation, don't emit an error 5244 // here; we'll catch this in the general case below. 5245 if (!isExplicitSpecialization || 5246 !isa<CXXRecordDecl>(Def) || 5247 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 5248 == TSK_ExplicitSpecialization) { 5249 Diag(NameLoc, diag::err_redefinition) << Name; 5250 Diag(Def->getLocation(), diag::note_previous_definition); 5251 // If this is a redefinition, recover by making this 5252 // struct be anonymous, which will make any later 5253 // references get the previous definition. 5254 Name = 0; 5255 Previous.clear(); 5256 Invalid = true; 5257 } 5258 } else { 5259 // If the type is currently being defined, complain 5260 // about a nested redefinition. 5261 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 5262 if (Tag->isBeingDefined()) { 5263 Diag(NameLoc, diag::err_nested_redefinition) << Name; 5264 Diag(PrevTagDecl->getLocation(), 5265 diag::note_previous_definition); 5266 Name = 0; 5267 Previous.clear(); 5268 Invalid = true; 5269 } 5270 } 5271 5272 // Okay, this is definition of a previously declared or referenced 5273 // tag PrevDecl. We're going to create a new Decl for it. 5274 } 5275 } 5276 // If we get here we have (another) forward declaration or we 5277 // have a definition. Just create a new decl. 5278 5279 } else { 5280 // If we get here, this is a definition of a new tag type in a nested 5281 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 5282 // new decl/type. We set PrevDecl to NULL so that the entities 5283 // have distinct types. 5284 Previous.clear(); 5285 } 5286 // If we get here, we're going to create a new Decl. If PrevDecl 5287 // is non-NULL, it's a definition of the tag declared by 5288 // PrevDecl. If it's NULL, we have a new definition. 5289 5290 5291 // Otherwise, PrevDecl is not a tag, but was found with tag 5292 // lookup. This is only actually possible in C++, where a few 5293 // things like templates still live in the tag namespace. 5294 } else { 5295 assert(getLangOptions().CPlusPlus); 5296 5297 // Use a better diagnostic if an elaborated-type-specifier 5298 // found the wrong kind of type on the first 5299 // (non-redeclaration) lookup. 5300 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 5301 !Previous.isForRedeclaration()) { 5302 unsigned Kind = 0; 5303 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5304 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5305 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 5306 Diag(PrevDecl->getLocation(), diag::note_declared_at); 5307 Invalid = true; 5308 5309 // Otherwise, only diagnose if the declaration is in scope. 5310 } else if (!isDeclInScope(PrevDecl, SearchDC, S)) { 5311 // do nothing 5312 5313 // Diagnose implicit declarations introduced by elaborated types. 5314 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 5315 unsigned Kind = 0; 5316 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5317 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5318 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 5319 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5320 Invalid = true; 5321 5322 // Otherwise it's a declaration. Call out a particularly common 5323 // case here. 5324 } else if (isa<TypedefDecl>(PrevDecl)) { 5325 Diag(NameLoc, diag::err_tag_definition_of_typedef) 5326 << Name 5327 << cast<TypedefDecl>(PrevDecl)->getUnderlyingType(); 5328 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5329 Invalid = true; 5330 5331 // Otherwise, diagnose. 5332 } else { 5333 // The tag name clashes with something else in the target scope, 5334 // issue an error and recover by making this tag be anonymous. 5335 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 5336 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5337 Name = 0; 5338 Invalid = true; 5339 } 5340 5341 // The existing declaration isn't relevant to us; we're in a 5342 // new scope, so clear out the previous declaration. 5343 Previous.clear(); 5344 } 5345 } 5346 5347CreateNewDecl: 5348 5349 TagDecl *PrevDecl = 0; 5350 if (Previous.isSingleResult()) 5351 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 5352 5353 // If there is an identifier, use the location of the identifier as the 5354 // location of the decl, otherwise use the location of the struct/union 5355 // keyword. 5356 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 5357 5358 // Otherwise, create a new declaration. If there is a previous 5359 // declaration of the same entity, the two will be linked via 5360 // PrevDecl. 5361 TagDecl *New; 5362 5363 if (Kind == TTK_Enum) { 5364 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5365 // enum X { A, B, C } D; D should chain to X. 5366 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 5367 cast_or_null<EnumDecl>(PrevDecl)); 5368 // If this is an undefined enum, warn. 5369 if (TUK != TUK_Definition && !Invalid) { 5370 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 5371 : diag::ext_forward_ref_enum; 5372 Diag(Loc, DK); 5373 } 5374 } else { 5375 // struct/union/class 5376 5377 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5378 // struct X { int A; } D; D should chain to X. 5379 if (getLangOptions().CPlusPlus) { 5380 // FIXME: Look for a way to use RecordDecl for simple structs. 5381 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5382 cast_or_null<CXXRecordDecl>(PrevDecl)); 5383 5384 if (isStdBadAlloc && (!StdBadAlloc || StdBadAlloc->isImplicit())) 5385 StdBadAlloc = cast<CXXRecordDecl>(New); 5386 } else 5387 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5388 cast_or_null<RecordDecl>(PrevDecl)); 5389 } 5390 5391 // Maybe add qualifier info. 5392 if (SS.isNotEmpty()) { 5393 if (SS.isSet()) { 5394 NestedNameSpecifier *NNS 5395 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5396 New->setQualifierInfo(NNS, SS.getRange()); 5397 } 5398 else 5399 Invalid = true; 5400 } 5401 5402 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 5403 // Add alignment attributes if necessary; these attributes are checked when 5404 // the ASTContext lays out the structure. 5405 // 5406 // It is important for implementing the correct semantics that this 5407 // happen here (in act on tag decl). The #pragma pack stack is 5408 // maintained as a result of parser callbacks which can occur at 5409 // many points during the parsing of a struct declaration (because 5410 // the #pragma tokens are effectively skipped over during the 5411 // parsing of the struct). 5412 AddAlignmentAttributesForRecord(RD); 5413 } 5414 5415 // If this is a specialization of a member class (of a class template), 5416 // check the specialization. 5417 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 5418 Invalid = true; 5419 5420 if (Invalid) 5421 New->setInvalidDecl(); 5422 5423 if (Attr) 5424 ProcessDeclAttributeList(S, New, Attr); 5425 5426 // If we're declaring or defining a tag in function prototype scope 5427 // in C, note that this type can only be used within the function. 5428 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 5429 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 5430 5431 // Set the lexical context. If the tag has a C++ scope specifier, the 5432 // lexical context will be different from the semantic context. 5433 New->setLexicalDeclContext(CurContext); 5434 5435 // Mark this as a friend decl if applicable. 5436 if (TUK == TUK_Friend) 5437 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 5438 5439 // Set the access specifier. 5440 if (!Invalid && SearchDC->isRecord()) 5441 SetMemberAccessSpecifier(New, PrevDecl, AS); 5442 5443 if (TUK == TUK_Definition) 5444 New->startDefinition(); 5445 5446 // If this has an identifier, add it to the scope stack. 5447 if (TUK == TUK_Friend) { 5448 // We might be replacing an existing declaration in the lookup tables; 5449 // if so, borrow its access specifier. 5450 if (PrevDecl) 5451 New->setAccess(PrevDecl->getAccess()); 5452 5453 DeclContext *DC = New->getDeclContext()->getLookupContext(); 5454 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 5455 if (Name) // can be null along some error paths 5456 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5457 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 5458 } else if (Name) { 5459 S = getNonFieldDeclScope(S); 5460 PushOnScopeChains(New, S); 5461 } else { 5462 CurContext->addDecl(New); 5463 } 5464 5465 // If this is the C FILE type, notify the AST context. 5466 if (IdentifierInfo *II = New->getIdentifier()) 5467 if (!New->isInvalidDecl() && 5468 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 5469 II->isStr("FILE")) 5470 Context.setFILEDecl(New); 5471 5472 OwnedDecl = true; 5473 return DeclPtrTy::make(New); 5474} 5475 5476void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 5477 AdjustDeclIfTemplate(TagD); 5478 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5479 5480 // Enter the tag context. 5481 PushDeclContext(S, Tag); 5482} 5483 5484void Sema::ActOnStartCXXMemberDeclarations(Scope *S, DeclPtrTy TagD, 5485 SourceLocation LBraceLoc) { 5486 AdjustDeclIfTemplate(TagD); 5487 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD.getAs<Decl>()); 5488 5489 FieldCollector->StartClass(); 5490 5491 if (!Record->getIdentifier()) 5492 return; 5493 5494 // C++ [class]p2: 5495 // [...] The class-name is also inserted into the scope of the 5496 // class itself; this is known as the injected-class-name. For 5497 // purposes of access checking, the injected-class-name is treated 5498 // as if it were a public member name. 5499 CXXRecordDecl *InjectedClassName 5500 = CXXRecordDecl::Create(Context, Record->getTagKind(), 5501 CurContext, Record->getLocation(), 5502 Record->getIdentifier(), 5503 Record->getTagKeywordLoc(), 5504 Record); 5505 InjectedClassName->setImplicit(); 5506 InjectedClassName->setAccess(AS_public); 5507 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 5508 InjectedClassName->setDescribedClassTemplate(Template); 5509 PushOnScopeChains(InjectedClassName, S); 5510 assert(InjectedClassName->isInjectedClassName() && 5511 "Broken injected-class-name"); 5512} 5513 5514void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 5515 SourceLocation RBraceLoc) { 5516 AdjustDeclIfTemplate(TagD); 5517 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5518 Tag->setRBraceLoc(RBraceLoc); 5519 5520 if (isa<CXXRecordDecl>(Tag)) 5521 FieldCollector->FinishClass(); 5522 5523 // Exit this scope of this tag's definition. 5524 PopDeclContext(); 5525 5526 // Notify the consumer that we've defined a tag. 5527 Consumer.HandleTagDeclDefinition(Tag); 5528} 5529 5530void Sema::ActOnTagDefinitionError(Scope *S, DeclPtrTy TagD) { 5531 AdjustDeclIfTemplate(TagD); 5532 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5533 Tag->setInvalidDecl(); 5534 5535 // We're undoing ActOnTagStartDefinition here, not 5536 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 5537 // the FieldCollector. 5538 5539 PopDeclContext(); 5540} 5541 5542// Note that FieldName may be null for anonymous bitfields. 5543bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 5544 QualType FieldTy, const Expr *BitWidth, 5545 bool *ZeroWidth) { 5546 // Default to true; that shouldn't confuse checks for emptiness 5547 if (ZeroWidth) 5548 *ZeroWidth = true; 5549 5550 // C99 6.7.2.1p4 - verify the field type. 5551 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 5552 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 5553 // Handle incomplete types with specific error. 5554 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 5555 return true; 5556 if (FieldName) 5557 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 5558 << FieldName << FieldTy << BitWidth->getSourceRange(); 5559 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 5560 << FieldTy << BitWidth->getSourceRange(); 5561 } 5562 5563 // If the bit-width is type- or value-dependent, don't try to check 5564 // it now. 5565 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 5566 return false; 5567 5568 llvm::APSInt Value; 5569 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 5570 return true; 5571 5572 if (Value != 0 && ZeroWidth) 5573 *ZeroWidth = false; 5574 5575 // Zero-width bitfield is ok for anonymous field. 5576 if (Value == 0 && FieldName) 5577 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 5578 5579 if (Value.isSigned() && Value.isNegative()) { 5580 if (FieldName) 5581 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 5582 << FieldName << Value.toString(10); 5583 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 5584 << Value.toString(10); 5585 } 5586 5587 if (!FieldTy->isDependentType()) { 5588 uint64_t TypeSize = Context.getTypeSize(FieldTy); 5589 if (Value.getZExtValue() > TypeSize) { 5590 if (!getLangOptions().CPlusPlus) { 5591 if (FieldName) 5592 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 5593 << FieldName << (unsigned)Value.getZExtValue() 5594 << (unsigned)TypeSize; 5595 5596 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 5597 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 5598 } 5599 5600 if (FieldName) 5601 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 5602 << FieldName << (unsigned)Value.getZExtValue() 5603 << (unsigned)TypeSize; 5604 else 5605 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 5606 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 5607 } 5608 } 5609 5610 return false; 5611} 5612 5613/// ActOnField - Each field of a struct/union/class is passed into this in order 5614/// to create a FieldDecl object for it. 5615Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 5616 SourceLocation DeclStart, 5617 Declarator &D, ExprTy *BitfieldWidth) { 5618 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 5619 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 5620 AS_public); 5621 return DeclPtrTy::make(Res); 5622} 5623 5624/// HandleField - Analyze a field of a C struct or a C++ data member. 5625/// 5626FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 5627 SourceLocation DeclStart, 5628 Declarator &D, Expr *BitWidth, 5629 AccessSpecifier AS) { 5630 IdentifierInfo *II = D.getIdentifier(); 5631 SourceLocation Loc = DeclStart; 5632 if (II) Loc = D.getIdentifierLoc(); 5633 5634 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 5635 QualType T = TInfo->getType(); 5636 if (getLangOptions().CPlusPlus) 5637 CheckExtraCXXDefaultArguments(D); 5638 5639 DiagnoseFunctionSpecifiers(D); 5640 5641 if (D.getDeclSpec().isThreadSpecified()) 5642 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5643 5644 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 5645 ForRedeclaration); 5646 5647 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5648 // Maybe we will complain about the shadowed template parameter. 5649 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5650 // Just pretend that we didn't see the previous declaration. 5651 PrevDecl = 0; 5652 } 5653 5654 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 5655 PrevDecl = 0; 5656 5657 bool Mutable 5658 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 5659 SourceLocation TSSL = D.getSourceRange().getBegin(); 5660 FieldDecl *NewFD 5661 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 5662 AS, PrevDecl, &D); 5663 5664 if (NewFD->isInvalidDecl()) 5665 Record->setInvalidDecl(); 5666 5667 if (NewFD->isInvalidDecl() && PrevDecl) { 5668 // Don't introduce NewFD into scope; there's already something 5669 // with the same name in the same scope. 5670 } else if (II) { 5671 PushOnScopeChains(NewFD, S); 5672 } else 5673 Record->addDecl(NewFD); 5674 5675 return NewFD; 5676} 5677 5678/// \brief Build a new FieldDecl and check its well-formedness. 5679/// 5680/// This routine builds a new FieldDecl given the fields name, type, 5681/// record, etc. \p PrevDecl should refer to any previous declaration 5682/// with the same name and in the same scope as the field to be 5683/// created. 5684/// 5685/// \returns a new FieldDecl. 5686/// 5687/// \todo The Declarator argument is a hack. It will be removed once 5688FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 5689 TypeSourceInfo *TInfo, 5690 RecordDecl *Record, SourceLocation Loc, 5691 bool Mutable, Expr *BitWidth, 5692 SourceLocation TSSL, 5693 AccessSpecifier AS, NamedDecl *PrevDecl, 5694 Declarator *D) { 5695 IdentifierInfo *II = Name.getAsIdentifierInfo(); 5696 bool InvalidDecl = false; 5697 if (D) InvalidDecl = D->isInvalidType(); 5698 5699 // If we receive a broken type, recover by assuming 'int' and 5700 // marking this declaration as invalid. 5701 if (T.isNull()) { 5702 InvalidDecl = true; 5703 T = Context.IntTy; 5704 } 5705 5706 QualType EltTy = Context.getBaseElementType(T); 5707 if (!EltTy->isDependentType() && 5708 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) 5709 InvalidDecl = true; 5710 5711 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5712 // than a variably modified type. 5713 if (!InvalidDecl && T->isVariablyModifiedType()) { 5714 bool SizeIsNegative; 5715 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 5716 SizeIsNegative); 5717 if (!FixedTy.isNull()) { 5718 Diag(Loc, diag::warn_illegal_constant_array_size); 5719 T = FixedTy; 5720 } else { 5721 if (SizeIsNegative) 5722 Diag(Loc, diag::err_typecheck_negative_array_size); 5723 else 5724 Diag(Loc, diag::err_typecheck_field_variable_size); 5725 InvalidDecl = true; 5726 } 5727 } 5728 5729 // Fields can not have abstract class types 5730 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 5731 diag::err_abstract_type_in_decl, 5732 AbstractFieldType)) 5733 InvalidDecl = true; 5734 5735 bool ZeroWidth = false; 5736 // If this is declared as a bit-field, check the bit-field. 5737 if (!InvalidDecl && BitWidth && 5738 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 5739 InvalidDecl = true; 5740 DeleteExpr(BitWidth); 5741 BitWidth = 0; 5742 ZeroWidth = false; 5743 } 5744 5745 // Check that 'mutable' is consistent with the type of the declaration. 5746 if (!InvalidDecl && Mutable) { 5747 unsigned DiagID = 0; 5748 if (T->isReferenceType()) 5749 DiagID = diag::err_mutable_reference; 5750 else if (T.isConstQualified()) 5751 DiagID = diag::err_mutable_const; 5752 5753 if (DiagID) { 5754 SourceLocation ErrLoc = Loc; 5755 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 5756 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 5757 Diag(ErrLoc, DiagID); 5758 Mutable = false; 5759 InvalidDecl = true; 5760 } 5761 } 5762 5763 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 5764 BitWidth, Mutable); 5765 if (InvalidDecl) 5766 NewFD->setInvalidDecl(); 5767 5768 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 5769 Diag(Loc, diag::err_duplicate_member) << II; 5770 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5771 NewFD->setInvalidDecl(); 5772 } 5773 5774 if (!InvalidDecl && getLangOptions().CPlusPlus) { 5775 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 5776 5777 if (!T->isPODType()) 5778 CXXRecord->setPOD(false); 5779 if (!ZeroWidth) 5780 CXXRecord->setEmpty(false); 5781 5782 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 5783 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 5784 5785 if (!RDecl->hasTrivialConstructor()) 5786 CXXRecord->setHasTrivialConstructor(false); 5787 if (!RDecl->hasTrivialCopyConstructor()) 5788 CXXRecord->setHasTrivialCopyConstructor(false); 5789 if (!RDecl->hasTrivialCopyAssignment()) 5790 CXXRecord->setHasTrivialCopyAssignment(false); 5791 if (!RDecl->hasTrivialDestructor()) 5792 CXXRecord->setHasTrivialDestructor(false); 5793 5794 // C++ 9.5p1: An object of a class with a non-trivial 5795 // constructor, a non-trivial copy constructor, a non-trivial 5796 // destructor, or a non-trivial copy assignment operator 5797 // cannot be a member of a union, nor can an array of such 5798 // objects. 5799 // TODO: C++0x alters this restriction significantly. 5800 if (Record->isUnion()) { 5801 // We check for copy constructors before constructors 5802 // because otherwise we'll never get complaints about 5803 // copy constructors. 5804 5805 CXXSpecialMember member = CXXInvalid; 5806 if (!RDecl->hasTrivialCopyConstructor()) 5807 member = CXXCopyConstructor; 5808 else if (!RDecl->hasTrivialConstructor()) 5809 member = CXXConstructor; 5810 else if (!RDecl->hasTrivialCopyAssignment()) 5811 member = CXXCopyAssignment; 5812 else if (!RDecl->hasTrivialDestructor()) 5813 member = CXXDestructor; 5814 5815 if (member != CXXInvalid) { 5816 Diag(Loc, diag::err_illegal_union_member) << Name << member; 5817 DiagnoseNontrivial(RT, member); 5818 NewFD->setInvalidDecl(); 5819 } 5820 } 5821 } 5822 } 5823 5824 // FIXME: We need to pass in the attributes given an AST 5825 // representation, not a parser representation. 5826 if (D) 5827 // FIXME: What to pass instead of TUScope? 5828 ProcessDeclAttributes(TUScope, NewFD, *D); 5829 5830 if (T.isObjCGCWeak()) 5831 Diag(Loc, diag::warn_attribute_weak_on_field); 5832 5833 NewFD->setAccess(AS); 5834 5835 // C++ [dcl.init.aggr]p1: 5836 // An aggregate is an array or a class (clause 9) with [...] no 5837 // private or protected non-static data members (clause 11). 5838 // A POD must be an aggregate. 5839 if (getLangOptions().CPlusPlus && 5840 (AS == AS_private || AS == AS_protected)) { 5841 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 5842 CXXRecord->setAggregate(false); 5843 CXXRecord->setPOD(false); 5844 } 5845 5846 return NewFD; 5847} 5848 5849/// DiagnoseNontrivial - Given that a class has a non-trivial 5850/// special member, figure out why. 5851void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 5852 QualType QT(T, 0U); 5853 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 5854 5855 // Check whether the member was user-declared. 5856 switch (member) { 5857 case CXXInvalid: 5858 break; 5859 5860 case CXXConstructor: 5861 if (RD->hasUserDeclaredConstructor()) { 5862 typedef CXXRecordDecl::ctor_iterator ctor_iter; 5863 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 5864 const FunctionDecl *body = 0; 5865 ci->getBody(body); 5866 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 5867 SourceLocation CtorLoc = ci->getLocation(); 5868 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5869 return; 5870 } 5871 } 5872 5873 assert(0 && "found no user-declared constructors"); 5874 return; 5875 } 5876 break; 5877 5878 case CXXCopyConstructor: 5879 if (RD->hasUserDeclaredCopyConstructor()) { 5880 SourceLocation CtorLoc = 5881 RD->getCopyConstructor(Context, 0)->getLocation(); 5882 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5883 return; 5884 } 5885 break; 5886 5887 case CXXCopyAssignment: 5888 if (RD->hasUserDeclaredCopyAssignment()) { 5889 // FIXME: this should use the location of the copy 5890 // assignment, not the type. 5891 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 5892 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 5893 return; 5894 } 5895 break; 5896 5897 case CXXDestructor: 5898 if (RD->hasUserDeclaredDestructor()) { 5899 SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation(); 5900 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5901 return; 5902 } 5903 break; 5904 } 5905 5906 typedef CXXRecordDecl::base_class_iterator base_iter; 5907 5908 // Virtual bases and members inhibit trivial copying/construction, 5909 // but not trivial destruction. 5910 if (member != CXXDestructor) { 5911 // Check for virtual bases. vbases includes indirect virtual bases, 5912 // so we just iterate through the direct bases. 5913 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 5914 if (bi->isVirtual()) { 5915 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5916 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 5917 return; 5918 } 5919 5920 // Check for virtual methods. 5921 typedef CXXRecordDecl::method_iterator meth_iter; 5922 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 5923 ++mi) { 5924 if (mi->isVirtual()) { 5925 SourceLocation MLoc = mi->getSourceRange().getBegin(); 5926 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 5927 return; 5928 } 5929 } 5930 } 5931 5932 bool (CXXRecordDecl::*hasTrivial)() const; 5933 switch (member) { 5934 case CXXConstructor: 5935 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 5936 case CXXCopyConstructor: 5937 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 5938 case CXXCopyAssignment: 5939 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 5940 case CXXDestructor: 5941 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 5942 default: 5943 assert(0 && "unexpected special member"); return; 5944 } 5945 5946 // Check for nontrivial bases (and recurse). 5947 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 5948 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 5949 assert(BaseRT && "Don't know how to handle dependent bases"); 5950 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 5951 if (!(BaseRecTy->*hasTrivial)()) { 5952 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5953 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 5954 DiagnoseNontrivial(BaseRT, member); 5955 return; 5956 } 5957 } 5958 5959 // Check for nontrivial members (and recurse). 5960 typedef RecordDecl::field_iterator field_iter; 5961 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 5962 ++fi) { 5963 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 5964 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 5965 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 5966 5967 if (!(EltRD->*hasTrivial)()) { 5968 SourceLocation FLoc = (*fi)->getLocation(); 5969 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 5970 DiagnoseNontrivial(EltRT, member); 5971 return; 5972 } 5973 } 5974 } 5975 5976 assert(0 && "found no explanation for non-trivial member"); 5977} 5978 5979/// TranslateIvarVisibility - Translate visibility from a token ID to an 5980/// AST enum value. 5981static ObjCIvarDecl::AccessControl 5982TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 5983 switch (ivarVisibility) { 5984 default: assert(0 && "Unknown visitibility kind"); 5985 case tok::objc_private: return ObjCIvarDecl::Private; 5986 case tok::objc_public: return ObjCIvarDecl::Public; 5987 case tok::objc_protected: return ObjCIvarDecl::Protected; 5988 case tok::objc_package: return ObjCIvarDecl::Package; 5989 } 5990} 5991 5992/// ActOnIvar - Each ivar field of an objective-c class is passed into this 5993/// in order to create an IvarDecl object for it. 5994Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 5995 SourceLocation DeclStart, 5996 DeclPtrTy IntfDecl, 5997 Declarator &D, ExprTy *BitfieldWidth, 5998 tok::ObjCKeywordKind Visibility) { 5999 6000 IdentifierInfo *II = D.getIdentifier(); 6001 Expr *BitWidth = (Expr*)BitfieldWidth; 6002 SourceLocation Loc = DeclStart; 6003 if (II) Loc = D.getIdentifierLoc(); 6004 6005 // FIXME: Unnamed fields can be handled in various different ways, for 6006 // example, unnamed unions inject all members into the struct namespace! 6007 6008 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6009 QualType T = TInfo->getType(); 6010 6011 if (BitWidth) { 6012 // 6.7.2.1p3, 6.7.2.1p4 6013 if (VerifyBitField(Loc, II, T, BitWidth)) { 6014 D.setInvalidType(); 6015 DeleteExpr(BitWidth); 6016 BitWidth = 0; 6017 } 6018 } else { 6019 // Not a bitfield. 6020 6021 // validate II. 6022 6023 } 6024 if (T->isReferenceType()) { 6025 Diag(Loc, diag::err_ivar_reference_type); 6026 D.setInvalidType(); 6027 } 6028 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6029 // than a variably modified type. 6030 else if (T->isVariablyModifiedType()) { 6031 Diag(Loc, diag::err_typecheck_ivar_variable_size); 6032 D.setInvalidType(); 6033 } 6034 6035 // Get the visibility (access control) for this ivar. 6036 ObjCIvarDecl::AccessControl ac = 6037 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 6038 : ObjCIvarDecl::None; 6039 // Must set ivar's DeclContext to its enclosing interface. 6040 ObjCContainerDecl *EnclosingDecl = IntfDecl.getAs<ObjCContainerDecl>(); 6041 ObjCContainerDecl *EnclosingContext; 6042 if (ObjCImplementationDecl *IMPDecl = 6043 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6044 // Case of ivar declared in an implementation. Context is that of its class. 6045 EnclosingContext = IMPDecl->getClassInterface(); 6046 assert(EnclosingContext && "Implementation has no class interface!"); 6047 } else { 6048 if (ObjCCategoryDecl *CDecl = 6049 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6050 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 6051 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 6052 return DeclPtrTy(); 6053 } 6054 } 6055 EnclosingContext = EnclosingDecl; 6056 } 6057 6058 // Construct the decl. 6059 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 6060 EnclosingContext, Loc, II, T, 6061 TInfo, ac, (Expr *)BitfieldWidth); 6062 6063 if (II) { 6064 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 6065 ForRedeclaration); 6066 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 6067 && !isa<TagDecl>(PrevDecl)) { 6068 Diag(Loc, diag::err_duplicate_member) << II; 6069 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6070 NewID->setInvalidDecl(); 6071 } 6072 } 6073 6074 // Process attributes attached to the ivar. 6075 ProcessDeclAttributes(S, NewID, D); 6076 6077 if (D.isInvalidType()) 6078 NewID->setInvalidDecl(); 6079 6080 if (II) { 6081 // FIXME: When interfaces are DeclContexts, we'll need to add 6082 // these to the interface. 6083 S->AddDecl(DeclPtrTy::make(NewID)); 6084 IdResolver.AddDecl(NewID); 6085 } 6086 6087 return DeclPtrTy::make(NewID); 6088} 6089 6090void Sema::ActOnFields(Scope* S, 6091 SourceLocation RecLoc, DeclPtrTy RecDecl, 6092 DeclPtrTy *Fields, unsigned NumFields, 6093 SourceLocation LBrac, SourceLocation RBrac, 6094 AttributeList *Attr) { 6095 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 6096 assert(EnclosingDecl && "missing record or interface decl"); 6097 6098 // If the decl this is being inserted into is invalid, then it may be a 6099 // redeclaration or some other bogus case. Don't try to add fields to it. 6100 if (EnclosingDecl->isInvalidDecl()) { 6101 // FIXME: Deallocate fields? 6102 return; 6103 } 6104 6105 6106 // Verify that all the fields are okay. 6107 unsigned NumNamedMembers = 0; 6108 llvm::SmallVector<FieldDecl*, 32> RecFields; 6109 6110 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 6111 for (unsigned i = 0; i != NumFields; ++i) { 6112 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 6113 6114 // Get the type for the field. 6115 Type *FDTy = FD->getType().getTypePtr(); 6116 6117 if (!FD->isAnonymousStructOrUnion()) { 6118 // Remember all fields written by the user. 6119 RecFields.push_back(FD); 6120 } 6121 6122 // If the field is already invalid for some reason, don't emit more 6123 // diagnostics about it. 6124 if (FD->isInvalidDecl()) { 6125 EnclosingDecl->setInvalidDecl(); 6126 continue; 6127 } 6128 6129 // C99 6.7.2.1p2: 6130 // A structure or union shall not contain a member with 6131 // incomplete or function type (hence, a structure shall not 6132 // contain an instance of itself, but may contain a pointer to 6133 // an instance of itself), except that the last member of a 6134 // structure with more than one named member may have incomplete 6135 // array type; such a structure (and any union containing, 6136 // possibly recursively, a member that is such a structure) 6137 // shall not be a member of a structure or an element of an 6138 // array. 6139 if (FDTy->isFunctionType()) { 6140 // Field declared as a function. 6141 Diag(FD->getLocation(), diag::err_field_declared_as_function) 6142 << FD->getDeclName(); 6143 FD->setInvalidDecl(); 6144 EnclosingDecl->setInvalidDecl(); 6145 continue; 6146 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 6147 Record && Record->isStruct()) { 6148 // Flexible array member. 6149 if (NumNamedMembers < 1) { 6150 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 6151 << FD->getDeclName(); 6152 FD->setInvalidDecl(); 6153 EnclosingDecl->setInvalidDecl(); 6154 continue; 6155 } 6156 if (!FD->getType()->isDependentType() && 6157 !Context.getBaseElementType(FD->getType())->isPODType()) { 6158 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 6159 << FD->getDeclName() << FD->getType(); 6160 FD->setInvalidDecl(); 6161 EnclosingDecl->setInvalidDecl(); 6162 continue; 6163 } 6164 6165 // Okay, we have a legal flexible array member at the end of the struct. 6166 if (Record) 6167 Record->setHasFlexibleArrayMember(true); 6168 } else if (!FDTy->isDependentType() && 6169 RequireCompleteType(FD->getLocation(), FD->getType(), 6170 diag::err_field_incomplete)) { 6171 // Incomplete type 6172 FD->setInvalidDecl(); 6173 EnclosingDecl->setInvalidDecl(); 6174 continue; 6175 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 6176 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 6177 // If this is a member of a union, then entire union becomes "flexible". 6178 if (Record && Record->isUnion()) { 6179 Record->setHasFlexibleArrayMember(true); 6180 } else { 6181 // If this is a struct/class and this is not the last element, reject 6182 // it. Note that GCC supports variable sized arrays in the middle of 6183 // structures. 6184 if (i != NumFields-1) 6185 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 6186 << FD->getDeclName() << FD->getType(); 6187 else { 6188 // We support flexible arrays at the end of structs in 6189 // other structs as an extension. 6190 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 6191 << FD->getDeclName(); 6192 if (Record) 6193 Record->setHasFlexibleArrayMember(true); 6194 } 6195 } 6196 } 6197 if (Record && FDTTy->getDecl()->hasObjectMember()) 6198 Record->setHasObjectMember(true); 6199 } else if (FDTy->isObjCObjectType()) { 6200 /// A field cannot be an Objective-c object 6201 Diag(FD->getLocation(), diag::err_statically_allocated_object); 6202 FD->setInvalidDecl(); 6203 EnclosingDecl->setInvalidDecl(); 6204 continue; 6205 } else if (getLangOptions().ObjC1 && 6206 getLangOptions().getGCMode() != LangOptions::NonGC && 6207 Record && 6208 (FD->getType()->isObjCObjectPointerType() || 6209 FD->getType().isObjCGCStrong())) 6210 Record->setHasObjectMember(true); 6211 // Keep track of the number of named members. 6212 if (FD->getIdentifier()) 6213 ++NumNamedMembers; 6214 } 6215 6216 // Okay, we successfully defined 'Record'. 6217 if (Record) { 6218 Record->completeDefinition(); 6219 } else { 6220 ObjCIvarDecl **ClsFields = 6221 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 6222 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 6223 ID->setLocEnd(RBrac); 6224 // Add ivar's to class's DeclContext. 6225 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6226 ClsFields[i]->setLexicalDeclContext(ID); 6227 ID->addDecl(ClsFields[i]); 6228 } 6229 // Must enforce the rule that ivars in the base classes may not be 6230 // duplicates. 6231 if (ID->getSuperClass()) 6232 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 6233 } else if (ObjCImplementationDecl *IMPDecl = 6234 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6235 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 6236 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 6237 // Ivar declared in @implementation never belongs to the implementation. 6238 // Only it is in implementation's lexical context. 6239 ClsFields[I]->setLexicalDeclContext(IMPDecl); 6240 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 6241 } else if (ObjCCategoryDecl *CDecl = 6242 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6243 // case of ivars in class extension; all other cases have been 6244 // reported as errors elsewhere. 6245 // FIXME. Class extension does not have a LocEnd field. 6246 // CDecl->setLocEnd(RBrac); 6247 // Add ivar's to class extension's DeclContext. 6248 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6249 ClsFields[i]->setLexicalDeclContext(CDecl); 6250 CDecl->addDecl(ClsFields[i]); 6251 } 6252 } 6253 } 6254 6255 if (Attr) 6256 ProcessDeclAttributeList(S, Record, Attr); 6257} 6258 6259/// \brief Determine whether the given integral value is representable within 6260/// the given type T. 6261static bool isRepresentableIntegerValue(ASTContext &Context, 6262 llvm::APSInt &Value, 6263 QualType T) { 6264 assert(T->isIntegralType() && "Integral type required!"); 6265 unsigned BitWidth = Context.getIntWidth(T); 6266 6267 if (Value.isUnsigned() || Value.isNonNegative()) 6268 return Value.getActiveBits() < BitWidth; 6269 6270 return Value.getMinSignedBits() <= BitWidth; 6271} 6272 6273// \brief Given an integral type, return the next larger integral type 6274// (or a NULL type of no such type exists). 6275static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 6276 // FIXME: Int128/UInt128 support, which also needs to be introduced into 6277 // enum checking below. 6278 assert(T->isIntegralType() && "Integral type required!"); 6279 const unsigned NumTypes = 4; 6280 QualType SignedIntegralTypes[NumTypes] = { 6281 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 6282 }; 6283 QualType UnsignedIntegralTypes[NumTypes] = { 6284 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 6285 Context.UnsignedLongLongTy 6286 }; 6287 6288 unsigned BitWidth = Context.getTypeSize(T); 6289 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 6290 : UnsignedIntegralTypes; 6291 for (unsigned I = 0; I != NumTypes; ++I) 6292 if (Context.getTypeSize(Types[I]) > BitWidth) 6293 return Types[I]; 6294 6295 return QualType(); 6296} 6297 6298EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 6299 EnumConstantDecl *LastEnumConst, 6300 SourceLocation IdLoc, 6301 IdentifierInfo *Id, 6302 ExprArg val) { 6303 Expr *Val = (Expr *)val.get(); 6304 6305 unsigned IntWidth = Context.Target.getIntWidth(); 6306 llvm::APSInt EnumVal(IntWidth); 6307 QualType EltTy; 6308 if (Val) { 6309 if (Enum->isDependentType() || Val->isTypeDependent()) 6310 EltTy = Context.DependentTy; 6311 else { 6312 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 6313 SourceLocation ExpLoc; 6314 if (!Val->isValueDependent() && 6315 VerifyIntegerConstantExpression(Val, &EnumVal)) { 6316 Val = 0; 6317 } else { 6318 if (!getLangOptions().CPlusPlus) { 6319 // C99 6.7.2.2p2: 6320 // The expression that defines the value of an enumeration constant 6321 // shall be an integer constant expression that has a value 6322 // representable as an int. 6323 6324 // Complain if the value is not representable in an int. 6325 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 6326 Diag(IdLoc, diag::ext_enum_value_not_int) 6327 << EnumVal.toString(10) << Val->getSourceRange() 6328 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 6329 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 6330 // Force the type of the expression to 'int'. 6331 ImpCastExprToType(Val, Context.IntTy, CastExpr::CK_IntegralCast); 6332 6333 if (Val != val.get()) { 6334 val.release(); 6335 val = Val; 6336 } 6337 } 6338 } 6339 6340 // C++0x [dcl.enum]p5: 6341 // If the underlying type is not fixed, the type of each enumerator 6342 // is the type of its initializing value: 6343 // - If an initializer is specified for an enumerator, the 6344 // initializing value has the same type as the expression. 6345 EltTy = Val->getType(); 6346 } 6347 } 6348 } 6349 6350 if (!Val) { 6351 if (Enum->isDependentType()) 6352 EltTy = Context.DependentTy; 6353 else if (!LastEnumConst) { 6354 // C++0x [dcl.enum]p5: 6355 // If the underlying type is not fixed, the type of each enumerator 6356 // is the type of its initializing value: 6357 // - If no initializer is specified for the first enumerator, the 6358 // initializing value has an unspecified integral type. 6359 // 6360 // GCC uses 'int' for its unspecified integral type, as does 6361 // C99 6.7.2.2p3. 6362 EltTy = Context.IntTy; 6363 } else { 6364 // Assign the last value + 1. 6365 EnumVal = LastEnumConst->getInitVal(); 6366 ++EnumVal; 6367 EltTy = LastEnumConst->getType(); 6368 6369 // Check for overflow on increment. 6370 if (EnumVal < LastEnumConst->getInitVal()) { 6371 // C++0x [dcl.enum]p5: 6372 // If the underlying type is not fixed, the type of each enumerator 6373 // is the type of its initializing value: 6374 // 6375 // - Otherwise the type of the initializing value is the same as 6376 // the type of the initializing value of the preceding enumerator 6377 // unless the incremented value is not representable in that type, 6378 // in which case the type is an unspecified integral type 6379 // sufficient to contain the incremented value. If no such type 6380 // exists, the program is ill-formed. 6381 QualType T = getNextLargerIntegralType(Context, EltTy); 6382 if (T.isNull()) { 6383 // There is no integral type larger enough to represent this 6384 // value. Complain, then allow the value to wrap around. 6385 EnumVal = LastEnumConst->getInitVal(); 6386 EnumVal.zext(EnumVal.getBitWidth() * 2); 6387 Diag(IdLoc, diag::warn_enumerator_too_large) 6388 << EnumVal.toString(10); 6389 } else { 6390 EltTy = T; 6391 } 6392 6393 // Retrieve the last enumerator's value, extent that type to the 6394 // type that is supposed to be large enough to represent the incremented 6395 // value, then increment. 6396 EnumVal = LastEnumConst->getInitVal(); 6397 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6398 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 6399 ++EnumVal; 6400 6401 // If we're not in C++, diagnose the overflow of enumerator values, 6402 // which in C99 means that the enumerator value is not representable in 6403 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 6404 // permits enumerator values that are representable in some larger 6405 // integral type. 6406 if (!getLangOptions().CPlusPlus && !T.isNull()) 6407 Diag(IdLoc, diag::warn_enum_value_overflow); 6408 } else if (!getLangOptions().CPlusPlus && 6409 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 6410 // Enforce C99 6.7.2.2p2 even when we compute the next value. 6411 Diag(IdLoc, diag::ext_enum_value_not_int) 6412 << EnumVal.toString(10) << 1; 6413 } 6414 } 6415 } 6416 6417 if (!EltTy->isDependentType()) { 6418 // Make the enumerator value match the signedness and size of the 6419 // enumerator's type. 6420 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 6421 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6422 } 6423 6424 val.release(); 6425 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 6426 Val, EnumVal); 6427} 6428 6429 6430Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 6431 DeclPtrTy lastEnumConst, 6432 SourceLocation IdLoc, 6433 IdentifierInfo *Id, 6434 SourceLocation EqualLoc, ExprTy *val) { 6435 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 6436 EnumConstantDecl *LastEnumConst = 6437 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 6438 Expr *Val = static_cast<Expr*>(val); 6439 6440 // The scope passed in may not be a decl scope. Zip up the scope tree until 6441 // we find one that is. 6442 S = getNonFieldDeclScope(S); 6443 6444 // Verify that there isn't already something declared with this name in this 6445 // scope. 6446 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 6447 ForRedeclaration); 6448 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6449 // Maybe we will complain about the shadowed template parameter. 6450 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 6451 // Just pretend that we didn't see the previous declaration. 6452 PrevDecl = 0; 6453 } 6454 6455 if (PrevDecl) { 6456 // When in C++, we may get a TagDecl with the same name; in this case the 6457 // enum constant will 'hide' the tag. 6458 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 6459 "Received TagDecl when not in C++!"); 6460 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 6461 if (isa<EnumConstantDecl>(PrevDecl)) 6462 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 6463 else 6464 Diag(IdLoc, diag::err_redefinition) << Id; 6465 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6466 if (Val) Val->Destroy(Context); 6467 return DeclPtrTy(); 6468 } 6469 } 6470 6471 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 6472 IdLoc, Id, Owned(Val)); 6473 6474 // Register this decl in the current scope stack. 6475 if (New) { 6476 New->setAccess(TheEnumDecl->getAccess()); 6477 PushOnScopeChains(New, S); 6478 } 6479 6480 return DeclPtrTy::make(New); 6481} 6482 6483void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 6484 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 6485 DeclPtrTy *Elements, unsigned NumElements, 6486 Scope *S, AttributeList *Attr) { 6487 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 6488 QualType EnumType = Context.getTypeDeclType(Enum); 6489 6490 if (Attr) 6491 ProcessDeclAttributeList(S, Enum, Attr); 6492 6493 if (Enum->isDependentType()) { 6494 for (unsigned i = 0; i != NumElements; ++i) { 6495 EnumConstantDecl *ECD = 6496 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6497 if (!ECD) continue; 6498 6499 ECD->setType(EnumType); 6500 } 6501 6502 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 6503 return; 6504 } 6505 6506 // TODO: If the result value doesn't fit in an int, it must be a long or long 6507 // long value. ISO C does not support this, but GCC does as an extension, 6508 // emit a warning. 6509 unsigned IntWidth = Context.Target.getIntWidth(); 6510 unsigned CharWidth = Context.Target.getCharWidth(); 6511 unsigned ShortWidth = Context.Target.getShortWidth(); 6512 6513 // Verify that all the values are okay, compute the size of the values, and 6514 // reverse the list. 6515 unsigned NumNegativeBits = 0; 6516 unsigned NumPositiveBits = 0; 6517 6518 // Keep track of whether all elements have type int. 6519 bool AllElementsInt = true; 6520 6521 for (unsigned i = 0; i != NumElements; ++i) { 6522 EnumConstantDecl *ECD = 6523 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6524 if (!ECD) continue; // Already issued a diagnostic. 6525 6526 const llvm::APSInt &InitVal = ECD->getInitVal(); 6527 6528 // Keep track of the size of positive and negative values. 6529 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 6530 NumPositiveBits = std::max(NumPositiveBits, 6531 (unsigned)InitVal.getActiveBits()); 6532 else 6533 NumNegativeBits = std::max(NumNegativeBits, 6534 (unsigned)InitVal.getMinSignedBits()); 6535 6536 // Keep track of whether every enum element has type int (very commmon). 6537 if (AllElementsInt) 6538 AllElementsInt = ECD->getType() == Context.IntTy; 6539 } 6540 6541 // Figure out the type that should be used for this enum. 6542 // FIXME: Support -fshort-enums. 6543 QualType BestType; 6544 unsigned BestWidth; 6545 6546 // C++0x N3000 [conv.prom]p3: 6547 // An rvalue of an unscoped enumeration type whose underlying 6548 // type is not fixed can be converted to an rvalue of the first 6549 // of the following types that can represent all the values of 6550 // the enumeration: int, unsigned int, long int, unsigned long 6551 // int, long long int, or unsigned long long int. 6552 // C99 6.4.4.3p2: 6553 // An identifier declared as an enumeration constant has type int. 6554 // The C99 rule is modified by a gcc extension 6555 QualType BestPromotionType; 6556 6557 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 6558 6559 if (NumNegativeBits) { 6560 // If there is a negative value, figure out the smallest integer type (of 6561 // int/long/longlong) that fits. 6562 // If it's packed, check also if it fits a char or a short. 6563 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 6564 BestType = Context.SignedCharTy; 6565 BestWidth = CharWidth; 6566 } else if (Packed && NumNegativeBits <= ShortWidth && 6567 NumPositiveBits < ShortWidth) { 6568 BestType = Context.ShortTy; 6569 BestWidth = ShortWidth; 6570 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 6571 BestType = Context.IntTy; 6572 BestWidth = IntWidth; 6573 } else { 6574 BestWidth = Context.Target.getLongWidth(); 6575 6576 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 6577 BestType = Context.LongTy; 6578 } else { 6579 BestWidth = Context.Target.getLongLongWidth(); 6580 6581 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 6582 Diag(Enum->getLocation(), diag::warn_enum_too_large); 6583 BestType = Context.LongLongTy; 6584 } 6585 } 6586 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 6587 } else { 6588 // If there is no negative value, figure out the smallest type that fits 6589 // all of the enumerator values. 6590 // If it's packed, check also if it fits a char or a short. 6591 if (Packed && NumPositiveBits <= CharWidth) { 6592 BestType = Context.UnsignedCharTy; 6593 BestPromotionType = Context.IntTy; 6594 BestWidth = CharWidth; 6595 } else if (Packed && NumPositiveBits <= ShortWidth) { 6596 BestType = Context.UnsignedShortTy; 6597 BestPromotionType = Context.IntTy; 6598 BestWidth = ShortWidth; 6599 } else if (NumPositiveBits <= IntWidth) { 6600 BestType = Context.UnsignedIntTy; 6601 BestWidth = IntWidth; 6602 BestPromotionType 6603 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6604 ? Context.UnsignedIntTy : Context.IntTy; 6605 } else if (NumPositiveBits <= 6606 (BestWidth = Context.Target.getLongWidth())) { 6607 BestType = Context.UnsignedLongTy; 6608 BestPromotionType 6609 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6610 ? Context.UnsignedLongTy : Context.LongTy; 6611 } else { 6612 BestWidth = Context.Target.getLongLongWidth(); 6613 assert(NumPositiveBits <= BestWidth && 6614 "How could an initializer get larger than ULL?"); 6615 BestType = Context.UnsignedLongLongTy; 6616 BestPromotionType 6617 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6618 ? Context.UnsignedLongLongTy : Context.LongLongTy; 6619 } 6620 } 6621 6622 // Loop over all of the enumerator constants, changing their types to match 6623 // the type of the enum if needed. 6624 for (unsigned i = 0; i != NumElements; ++i) { 6625 EnumConstantDecl *ECD = 6626 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6627 if (!ECD) continue; // Already issued a diagnostic. 6628 6629 // Standard C says the enumerators have int type, but we allow, as an 6630 // extension, the enumerators to be larger than int size. If each 6631 // enumerator value fits in an int, type it as an int, otherwise type it the 6632 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 6633 // that X has type 'int', not 'unsigned'. 6634 6635 // Determine whether the value fits into an int. 6636 llvm::APSInt InitVal = ECD->getInitVal(); 6637 6638 // If it fits into an integer type, force it. Otherwise force it to match 6639 // the enum decl type. 6640 QualType NewTy; 6641 unsigned NewWidth; 6642 bool NewSign; 6643 if (!getLangOptions().CPlusPlus && 6644 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 6645 NewTy = Context.IntTy; 6646 NewWidth = IntWidth; 6647 NewSign = true; 6648 } else if (ECD->getType() == BestType) { 6649 // Already the right type! 6650 if (getLangOptions().CPlusPlus) 6651 // C++ [dcl.enum]p4: Following the closing brace of an 6652 // enum-specifier, each enumerator has the type of its 6653 // enumeration. 6654 ECD->setType(EnumType); 6655 continue; 6656 } else { 6657 NewTy = BestType; 6658 NewWidth = BestWidth; 6659 NewSign = BestType->isSignedIntegerType(); 6660 } 6661 6662 // Adjust the APSInt value. 6663 InitVal.extOrTrunc(NewWidth); 6664 InitVal.setIsSigned(NewSign); 6665 ECD->setInitVal(InitVal); 6666 6667 // Adjust the Expr initializer and type. 6668 if (ECD->getInitExpr()) 6669 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, 6670 CastExpr::CK_IntegralCast, 6671 ECD->getInitExpr(), 6672 CXXBaseSpecifierArray(), 6673 /*isLvalue=*/false)); 6674 if (getLangOptions().CPlusPlus) 6675 // C++ [dcl.enum]p4: Following the closing brace of an 6676 // enum-specifier, each enumerator has the type of its 6677 // enumeration. 6678 ECD->setType(EnumType); 6679 else 6680 ECD->setType(NewTy); 6681 } 6682 6683 Enum->completeDefinition(BestType, BestPromotionType, 6684 NumPositiveBits, NumNegativeBits); 6685} 6686 6687Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 6688 ExprArg expr) { 6689 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 6690 6691 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 6692 Loc, AsmString); 6693 CurContext->addDecl(New); 6694 return DeclPtrTy::make(New); 6695} 6696 6697void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 6698 SourceLocation PragmaLoc, 6699 SourceLocation NameLoc) { 6700 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 6701 6702 if (PrevDecl) { 6703 PrevDecl->addAttr(::new (Context) WeakAttr()); 6704 } else { 6705 (void)WeakUndeclaredIdentifiers.insert( 6706 std::pair<IdentifierInfo*,WeakInfo> 6707 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 6708 } 6709} 6710 6711void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 6712 IdentifierInfo* AliasName, 6713 SourceLocation PragmaLoc, 6714 SourceLocation NameLoc, 6715 SourceLocation AliasNameLoc) { 6716 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 6717 LookupOrdinaryName); 6718 WeakInfo W = WeakInfo(Name, NameLoc); 6719 6720 if (PrevDecl) { 6721 if (!PrevDecl->hasAttr<AliasAttr>()) 6722 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 6723 DeclApplyPragmaWeak(TUScope, ND, W); 6724 } else { 6725 (void)WeakUndeclaredIdentifiers.insert( 6726 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 6727 } 6728} 6729