SemaDecl.cpp revision db89f289a22897f1031c92f3e49f7a9ba7bae61e
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(S, 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() && !NewType->getNoReturnAttr()) { 1061 NewQType = Context.getNoReturnType(NewQType); 1062 New->setType(NewQType); 1063 assert(NewQType.isCanonical()); 1064 } 1065 1066 // Merge regparm attribute. 1067 if (OldType->getRegParmType() != NewType->getRegParmType()) { 1068 if (NewType->getRegParmType()) { 1069 Diag(New->getLocation(), diag::err_regparm_mismatch) 1070 << NewType->getRegParmType() 1071 << OldType->getRegParmType(); 1072 Diag(Old->getLocation(), diag::note_previous_declaration); 1073 return true; 1074 } 1075 1076 NewQType = Context.getRegParmType(NewQType, OldType->getRegParmType()); 1077 New->setType(NewQType); 1078 assert(NewQType.isCanonical()); 1079 } 1080 1081 if (getLangOptions().CPlusPlus) { 1082 // (C++98 13.1p2): 1083 // Certain function declarations cannot be overloaded: 1084 // -- Function declarations that differ only in the return type 1085 // cannot be overloaded. 1086 QualType OldReturnType 1087 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1088 QualType NewReturnType 1089 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1090 QualType ResQT; 1091 if (OldReturnType != NewReturnType) { 1092 if (NewReturnType->isObjCObjectPointerType() 1093 && OldReturnType->isObjCObjectPointerType()) 1094 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1095 if (ResQT.isNull()) { 1096 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1097 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1098 return true; 1099 } 1100 else 1101 NewQType = ResQT; 1102 } 1103 1104 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1105 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1106 if (OldMethod && NewMethod) { 1107 // Preserve triviality. 1108 NewMethod->setTrivial(OldMethod->isTrivial()); 1109 1110 bool isFriend = NewMethod->getFriendObjectKind(); 1111 1112 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) { 1113 // -- Member function declarations with the same name and the 1114 // same parameter types cannot be overloaded if any of them 1115 // is a static member function declaration. 1116 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1117 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1118 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1119 return true; 1120 } 1121 1122 // C++ [class.mem]p1: 1123 // [...] A member shall not be declared twice in the 1124 // member-specification, except that a nested class or member 1125 // class template can be declared and then later defined. 1126 unsigned NewDiag; 1127 if (isa<CXXConstructorDecl>(OldMethod)) 1128 NewDiag = diag::err_constructor_redeclared; 1129 else if (isa<CXXDestructorDecl>(NewMethod)) 1130 NewDiag = diag::err_destructor_redeclared; 1131 else if (isa<CXXConversionDecl>(NewMethod)) 1132 NewDiag = diag::err_conv_function_redeclared; 1133 else 1134 NewDiag = diag::err_member_redeclared; 1135 1136 Diag(New->getLocation(), NewDiag); 1137 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1138 1139 // Complain if this is an explicit declaration of a special 1140 // member that was initially declared implicitly. 1141 // 1142 // As an exception, it's okay to befriend such methods in order 1143 // to permit the implicit constructor/destructor/operator calls. 1144 } else if (OldMethod->isImplicit()) { 1145 if (isFriend) { 1146 NewMethod->setImplicit(); 1147 } else { 1148 Diag(NewMethod->getLocation(), 1149 diag::err_definition_of_implicitly_declared_member) 1150 << New << getSpecialMember(OldMethod); 1151 return true; 1152 } 1153 } 1154 } 1155 1156 // (C++98 8.3.5p3): 1157 // All declarations for a function shall agree exactly in both the 1158 // return type and the parameter-type-list. 1159 // attributes should be ignored when comparing. 1160 if (Context.getNoReturnType(OldQType, false) == 1161 Context.getNoReturnType(NewQType, false)) 1162 return MergeCompatibleFunctionDecls(New, Old); 1163 1164 // Fall through for conflicting redeclarations and redefinitions. 1165 } 1166 1167 // C: Function types need to be compatible, not identical. This handles 1168 // duplicate function decls like "void f(int); void f(enum X);" properly. 1169 if (!getLangOptions().CPlusPlus && 1170 Context.typesAreCompatible(OldQType, NewQType)) { 1171 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1172 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1173 const FunctionProtoType *OldProto = 0; 1174 if (isa<FunctionNoProtoType>(NewFuncType) && 1175 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1176 // The old declaration provided a function prototype, but the 1177 // new declaration does not. Merge in the prototype. 1178 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1179 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1180 OldProto->arg_type_end()); 1181 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1182 ParamTypes.data(), ParamTypes.size(), 1183 OldProto->isVariadic(), 1184 OldProto->getTypeQuals(), 1185 false, false, 0, 0, 1186 OldProto->getExtInfo()); 1187 New->setType(NewQType); 1188 New->setHasInheritedPrototype(); 1189 1190 // Synthesize a parameter for each argument type. 1191 llvm::SmallVector<ParmVarDecl*, 16> Params; 1192 for (FunctionProtoType::arg_type_iterator 1193 ParamType = OldProto->arg_type_begin(), 1194 ParamEnd = OldProto->arg_type_end(); 1195 ParamType != ParamEnd; ++ParamType) { 1196 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1197 SourceLocation(), 0, 1198 *ParamType, /*TInfo=*/0, 1199 VarDecl::None, VarDecl::None, 1200 0); 1201 Param->setImplicit(); 1202 Params.push_back(Param); 1203 } 1204 1205 New->setParams(Params.data(), Params.size()); 1206 } 1207 1208 return MergeCompatibleFunctionDecls(New, Old); 1209 } 1210 1211 // GNU C permits a K&R definition to follow a prototype declaration 1212 // if the declared types of the parameters in the K&R definition 1213 // match the types in the prototype declaration, even when the 1214 // promoted types of the parameters from the K&R definition differ 1215 // from the types in the prototype. GCC then keeps the types from 1216 // the prototype. 1217 // 1218 // If a variadic prototype is followed by a non-variadic K&R definition, 1219 // the K&R definition becomes variadic. This is sort of an edge case, but 1220 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1221 // C99 6.9.1p8. 1222 if (!getLangOptions().CPlusPlus && 1223 Old->hasPrototype() && !New->hasPrototype() && 1224 New->getType()->getAs<FunctionProtoType>() && 1225 Old->getNumParams() == New->getNumParams()) { 1226 llvm::SmallVector<QualType, 16> ArgTypes; 1227 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1228 const FunctionProtoType *OldProto 1229 = Old->getType()->getAs<FunctionProtoType>(); 1230 const FunctionProtoType *NewProto 1231 = New->getType()->getAs<FunctionProtoType>(); 1232 1233 // Determine whether this is the GNU C extension. 1234 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1235 NewProto->getResultType()); 1236 bool LooseCompatible = !MergedReturn.isNull(); 1237 for (unsigned Idx = 0, End = Old->getNumParams(); 1238 LooseCompatible && Idx != End; ++Idx) { 1239 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1240 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1241 if (Context.typesAreCompatible(OldParm->getType(), 1242 NewProto->getArgType(Idx))) { 1243 ArgTypes.push_back(NewParm->getType()); 1244 } else if (Context.typesAreCompatible(OldParm->getType(), 1245 NewParm->getType())) { 1246 GNUCompatibleParamWarning Warn 1247 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1248 Warnings.push_back(Warn); 1249 ArgTypes.push_back(NewParm->getType()); 1250 } else 1251 LooseCompatible = false; 1252 } 1253 1254 if (LooseCompatible) { 1255 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1256 Diag(Warnings[Warn].NewParm->getLocation(), 1257 diag::ext_param_promoted_not_compatible_with_prototype) 1258 << Warnings[Warn].PromotedType 1259 << Warnings[Warn].OldParm->getType(); 1260 Diag(Warnings[Warn].OldParm->getLocation(), 1261 diag::note_previous_declaration); 1262 } 1263 1264 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1265 ArgTypes.size(), 1266 OldProto->isVariadic(), 0, 1267 false, false, 0, 0, 1268 OldProto->getExtInfo())); 1269 return MergeCompatibleFunctionDecls(New, Old); 1270 } 1271 1272 // Fall through to diagnose conflicting types. 1273 } 1274 1275 // A function that has already been declared has been redeclared or defined 1276 // with a different type- show appropriate diagnostic 1277 if (unsigned BuiltinID = Old->getBuiltinID()) { 1278 // The user has declared a builtin function with an incompatible 1279 // signature. 1280 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1281 // The function the user is redeclaring is a library-defined 1282 // function like 'malloc' or 'printf'. Warn about the 1283 // redeclaration, then pretend that we don't know about this 1284 // library built-in. 1285 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1286 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1287 << Old << Old->getType(); 1288 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1289 Old->setInvalidDecl(); 1290 return false; 1291 } 1292 1293 PrevDiag = diag::note_previous_builtin_declaration; 1294 } 1295 1296 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1297 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1298 return true; 1299} 1300 1301/// \brief Completes the merge of two function declarations that are 1302/// known to be compatible. 1303/// 1304/// This routine handles the merging of attributes and other 1305/// properties of function declarations form the old declaration to 1306/// the new declaration, once we know that New is in fact a 1307/// redeclaration of Old. 1308/// 1309/// \returns false 1310bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1311 // Merge the attributes 1312 MergeAttributes(New, Old, Context); 1313 1314 // Merge the storage class. 1315 if (Old->getStorageClass() != FunctionDecl::Extern && 1316 Old->getStorageClass() != FunctionDecl::None) 1317 New->setStorageClass(Old->getStorageClass()); 1318 1319 // Merge "pure" flag. 1320 if (Old->isPure()) 1321 New->setPure(); 1322 1323 // Merge the "deleted" flag. 1324 if (Old->isDeleted()) 1325 New->setDeleted(); 1326 1327 if (getLangOptions().CPlusPlus) 1328 return MergeCXXFunctionDecl(New, Old); 1329 1330 return false; 1331} 1332 1333/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1334/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1335/// situation, merging decls or emitting diagnostics as appropriate. 1336/// 1337/// Tentative definition rules (C99 6.9.2p2) are checked by 1338/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1339/// definitions here, since the initializer hasn't been attached. 1340/// 1341void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1342 // If the new decl is already invalid, don't do any other checking. 1343 if (New->isInvalidDecl()) 1344 return; 1345 1346 // Verify the old decl was also a variable. 1347 VarDecl *Old = 0; 1348 if (!Previous.isSingleResult() || 1349 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1350 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1351 << New->getDeclName(); 1352 Diag(Previous.getRepresentativeDecl()->getLocation(), 1353 diag::note_previous_definition); 1354 return New->setInvalidDecl(); 1355 } 1356 1357 MergeAttributes(New, Old, Context); 1358 1359 // Merge the types 1360 QualType MergedT; 1361 if (getLangOptions().CPlusPlus) { 1362 if (Context.hasSameType(New->getType(), Old->getType())) 1363 MergedT = New->getType(); 1364 // C++ [basic.link]p10: 1365 // [...] the types specified by all declarations referring to a given 1366 // object or function shall be identical, except that declarations for an 1367 // array object can specify array types that differ by the presence or 1368 // absence of a major array bound (8.3.4). 1369 else if (Old->getType()->isIncompleteArrayType() && 1370 New->getType()->isArrayType()) { 1371 CanQual<ArrayType> OldArray 1372 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1373 CanQual<ArrayType> NewArray 1374 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1375 if (OldArray->getElementType() == NewArray->getElementType()) 1376 MergedT = New->getType(); 1377 } else if (Old->getType()->isArrayType() && 1378 New->getType()->isIncompleteArrayType()) { 1379 CanQual<ArrayType> OldArray 1380 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1381 CanQual<ArrayType> NewArray 1382 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1383 if (OldArray->getElementType() == NewArray->getElementType()) 1384 MergedT = Old->getType(); 1385 } else if (New->getType()->isObjCObjectPointerType() 1386 && Old->getType()->isObjCObjectPointerType()) { 1387 MergedT = Context.mergeObjCGCQualifiers(New->getType(), Old->getType()); 1388 } 1389 } else { 1390 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1391 } 1392 if (MergedT.isNull()) { 1393 Diag(New->getLocation(), diag::err_redefinition_different_type) 1394 << New->getDeclName(); 1395 Diag(Old->getLocation(), diag::note_previous_definition); 1396 return New->setInvalidDecl(); 1397 } 1398 New->setType(MergedT); 1399 1400 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1401 if (New->getStorageClass() == VarDecl::Static && 1402 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 1403 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1404 Diag(Old->getLocation(), diag::note_previous_definition); 1405 return New->setInvalidDecl(); 1406 } 1407 // C99 6.2.2p4: 1408 // For an identifier declared with the storage-class specifier 1409 // extern in a scope in which a prior declaration of that 1410 // identifier is visible,23) if the prior declaration specifies 1411 // internal or external linkage, the linkage of the identifier at 1412 // the later declaration is the same as the linkage specified at 1413 // the prior declaration. If no prior declaration is visible, or 1414 // if the prior declaration specifies no linkage, then the 1415 // identifier has external linkage. 1416 if (New->hasExternalStorage() && Old->hasLinkage()) 1417 /* Okay */; 1418 else if (New->getStorageClass() != VarDecl::Static && 1419 Old->getStorageClass() == VarDecl::Static) { 1420 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1421 Diag(Old->getLocation(), diag::note_previous_definition); 1422 return New->setInvalidDecl(); 1423 } 1424 1425 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1426 1427 // FIXME: The test for external storage here seems wrong? We still 1428 // need to check for mismatches. 1429 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1430 // Don't complain about out-of-line definitions of static members. 1431 !(Old->getLexicalDeclContext()->isRecord() && 1432 !New->getLexicalDeclContext()->isRecord())) { 1433 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1434 Diag(Old->getLocation(), diag::note_previous_definition); 1435 return New->setInvalidDecl(); 1436 } 1437 1438 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1439 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1440 Diag(Old->getLocation(), diag::note_previous_definition); 1441 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1442 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1443 Diag(Old->getLocation(), diag::note_previous_definition); 1444 } 1445 1446 // C++ doesn't have tentative definitions, so go right ahead and check here. 1447 const VarDecl *Def; 1448 if (getLangOptions().CPlusPlus && 1449 New->isThisDeclarationADefinition() == VarDecl::Definition && 1450 (Def = Old->getDefinition())) { 1451 Diag(New->getLocation(), diag::err_redefinition) 1452 << New->getDeclName(); 1453 Diag(Def->getLocation(), diag::note_previous_definition); 1454 New->setInvalidDecl(); 1455 return; 1456 } 1457 // c99 6.2.2 P4. 1458 // For an identifier declared with the storage-class specifier extern in a 1459 // scope in which a prior declaration of that identifier is visible, if 1460 // the prior declaration specifies internal or external linkage, the linkage 1461 // of the identifier at the later declaration is the same as the linkage 1462 // specified at the prior declaration. 1463 // FIXME. revisit this code. 1464 if (New->hasExternalStorage() && 1465 Old->getLinkage() == InternalLinkage && 1466 New->getDeclContext() == Old->getDeclContext()) 1467 New->setStorageClass(Old->getStorageClass()); 1468 1469 // Keep a chain of previous declarations. 1470 New->setPreviousDeclaration(Old); 1471 1472 // Inherit access appropriately. 1473 New->setAccess(Old->getAccess()); 1474} 1475 1476/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1477/// no declarator (e.g. "struct foo;") is parsed. 1478Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 1479 DeclSpec &DS) { 1480 // FIXME: Error on auto/register at file scope 1481 // FIXME: Error on inline/virtual/explicit 1482 // FIXME: Warn on useless __thread 1483 // FIXME: Warn on useless const/volatile 1484 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1485 // FIXME: Warn on useless attributes 1486 Decl *TagD = 0; 1487 TagDecl *Tag = 0; 1488 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1489 DS.getTypeSpecType() == DeclSpec::TST_struct || 1490 DS.getTypeSpecType() == DeclSpec::TST_union || 1491 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1492 TagD = static_cast<Decl *>(DS.getTypeRep()); 1493 1494 if (!TagD) // We probably had an error 1495 return DeclPtrTy(); 1496 1497 // Note that the above type specs guarantee that the 1498 // type rep is a Decl, whereas in many of the others 1499 // it's a Type. 1500 Tag = dyn_cast<TagDecl>(TagD); 1501 } 1502 1503 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1504 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1505 // or incomplete types shall not be restrict-qualified." 1506 if (TypeQuals & DeclSpec::TQ_restrict) 1507 Diag(DS.getRestrictSpecLoc(), 1508 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1509 << DS.getSourceRange(); 1510 } 1511 1512 if (DS.isFriendSpecified()) { 1513 // If we're dealing with a class template decl, assume that the 1514 // template routines are handling it. 1515 if (TagD && isa<ClassTemplateDecl>(TagD)) 1516 return DeclPtrTy(); 1517 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1518 } 1519 1520 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1521 // If there are attributes in the DeclSpec, apply them to the record. 1522 if (const AttributeList *AL = DS.getAttributes()) 1523 ProcessDeclAttributeList(S, Record, AL); 1524 1525 if (!Record->getDeclName() && Record->isDefinition() && 1526 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1527 if (getLangOptions().CPlusPlus || 1528 Record->getDeclContext()->isRecord()) 1529 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 1530 1531 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1532 << DS.getSourceRange(); 1533 } 1534 1535 // Microsoft allows unnamed struct/union fields. Don't complain 1536 // about them. 1537 // FIXME: Should we support Microsoft's extensions in this area? 1538 if (Record->getDeclName() && getLangOptions().Microsoft) 1539 return DeclPtrTy::make(Tag); 1540 } 1541 1542 if (!DS.isMissingDeclaratorOk() && 1543 DS.getTypeSpecType() != DeclSpec::TST_error) { 1544 // Warn about typedefs of enums without names, since this is an 1545 // extension in both Microsoft an GNU. 1546 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1547 Tag && isa<EnumDecl>(Tag)) { 1548 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1549 << DS.getSourceRange(); 1550 return DeclPtrTy::make(Tag); 1551 } 1552 1553 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1554 << DS.getSourceRange(); 1555 } 1556 1557 return DeclPtrTy::make(Tag); 1558} 1559 1560/// We are trying to inject an anonymous member into the given scope; 1561/// check if there's an existing declaration that can't be overloaded. 1562/// 1563/// \return true if this is a forbidden redeclaration 1564static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1565 Scope *S, 1566 DeclContext *Owner, 1567 DeclarationName Name, 1568 SourceLocation NameLoc, 1569 unsigned diagnostic) { 1570 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1571 Sema::ForRedeclaration); 1572 if (!SemaRef.LookupName(R, S)) return false; 1573 1574 if (R.getAsSingle<TagDecl>()) 1575 return false; 1576 1577 // Pick a representative declaration. 1578 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1579 if (PrevDecl && Owner->isRecord()) { 1580 RecordDecl *Record = cast<RecordDecl>(Owner); 1581 if (!SemaRef.isDeclInScope(PrevDecl, Record, S)) 1582 return false; 1583 } 1584 1585 SemaRef.Diag(NameLoc, diagnostic) << Name; 1586 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1587 1588 return true; 1589} 1590 1591/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1592/// anonymous struct or union AnonRecord into the owning context Owner 1593/// and scope S. This routine will be invoked just after we realize 1594/// that an unnamed union or struct is actually an anonymous union or 1595/// struct, e.g., 1596/// 1597/// @code 1598/// union { 1599/// int i; 1600/// float f; 1601/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1602/// // f into the surrounding scope.x 1603/// @endcode 1604/// 1605/// This routine is recursive, injecting the names of nested anonymous 1606/// structs/unions into the owning context and scope as well. 1607static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 1608 DeclContext *Owner, 1609 RecordDecl *AnonRecord, 1610 AccessSpecifier AS) { 1611 unsigned diagKind 1612 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1613 : diag::err_anonymous_struct_member_redecl; 1614 1615 bool Invalid = false; 1616 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1617 FEnd = AnonRecord->field_end(); 1618 F != FEnd; ++F) { 1619 if ((*F)->getDeclName()) { 1620 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, (*F)->getDeclName(), 1621 (*F)->getLocation(), diagKind)) { 1622 // C++ [class.union]p2: 1623 // The names of the members of an anonymous union shall be 1624 // distinct from the names of any other entity in the 1625 // scope in which the anonymous union is declared. 1626 Invalid = true; 1627 } else { 1628 // C++ [class.union]p2: 1629 // For the purpose of name lookup, after the anonymous union 1630 // definition, the members of the anonymous union are 1631 // considered to have been defined in the scope in which the 1632 // anonymous union is declared. 1633 Owner->makeDeclVisibleInContext(*F); 1634 S->AddDecl(Sema::DeclPtrTy::make(*F)); 1635 SemaRef.IdResolver.AddDecl(*F); 1636 1637 // That includes picking up the appropriate access specifier. 1638 if (AS != AS_none) (*F)->setAccess(AS); 1639 } 1640 } else if (const RecordType *InnerRecordType 1641 = (*F)->getType()->getAs<RecordType>()) { 1642 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1643 if (InnerRecord->isAnonymousStructOrUnion()) 1644 Invalid = Invalid || 1645 InjectAnonymousStructOrUnionMembers(SemaRef, S, Owner, 1646 InnerRecord, AS); 1647 } 1648 } 1649 1650 return Invalid; 1651} 1652 1653/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 1654/// a VarDecl::StorageClass. Any error reporting is up to the caller: 1655/// illegal input values are mapped to VarDecl::None. 1656/// If the input declaration context is a linkage specification 1657/// with no braces, then Extern is mapped to None. 1658static VarDecl::StorageClass 1659StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec, 1660 DeclContext *DC) { 1661 switch (StorageClassSpec) { 1662 case DeclSpec::SCS_unspecified: return VarDecl::None; 1663 case DeclSpec::SCS_extern: 1664 // If the current context is a C++ linkage specification 1665 // having no braces, then the keyword "extern" is properly part 1666 // of the linkage specification itself, rather than being 1667 // the written storage class specifier. 1668 return (DC && isa<LinkageSpecDecl>(DC) && 1669 !cast<LinkageSpecDecl>(DC)->hasBraces()) 1670 ? VarDecl::None : VarDecl::Extern; 1671 case DeclSpec::SCS_static: return VarDecl::Static; 1672 case DeclSpec::SCS_auto: return VarDecl::Auto; 1673 case DeclSpec::SCS_register: return VarDecl::Register; 1674 case DeclSpec::SCS_private_extern: return VarDecl::PrivateExtern; 1675 // Illegal SCSs map to None: error reporting is up to the caller. 1676 case DeclSpec::SCS_mutable: // Fall through. 1677 case DeclSpec::SCS_typedef: return VarDecl::None; 1678 } 1679 llvm_unreachable("unknown storage class specifier"); 1680} 1681 1682/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 1683/// a FunctionDecl::StorageClass. Any error reporting is up to the caller: 1684/// illegal input values are mapped to FunctionDecl::None. 1685/// If the input declaration context is a linkage specification 1686/// with no braces, then Extern is mapped to None. 1687static FunctionDecl::StorageClass 1688StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec, 1689 DeclContext *DC) { 1690 switch (StorageClassSpec) { 1691 case DeclSpec::SCS_unspecified: return FunctionDecl::None; 1692 case DeclSpec::SCS_extern: 1693 // If the current context is a C++ linkage specification 1694 // having no braces, then the keyword "extern" is properly part 1695 // of the linkage specification itself, rather than being 1696 // the written storage class specifier. 1697 return (DC && isa<LinkageSpecDecl>(DC) && 1698 !cast<LinkageSpecDecl>(DC)->hasBraces()) 1699 ? FunctionDecl::None : FunctionDecl::Extern; 1700 case DeclSpec::SCS_static: return FunctionDecl::Static; 1701 case DeclSpec::SCS_private_extern: return FunctionDecl::PrivateExtern; 1702 // Illegal SCSs map to None: error reporting is up to the caller. 1703 case DeclSpec::SCS_auto: // Fall through. 1704 case DeclSpec::SCS_mutable: // Fall through. 1705 case DeclSpec::SCS_register: // Fall through. 1706 case DeclSpec::SCS_typedef: return FunctionDecl::None; 1707 } 1708 llvm_unreachable("unknown storage class specifier"); 1709} 1710 1711/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1712/// anonymous structure or union. Anonymous unions are a C++ feature 1713/// (C++ [class.union]) and a GNU C extension; anonymous structures 1714/// are a GNU C and GNU C++ extension. 1715Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1716 AccessSpecifier AS, 1717 RecordDecl *Record) { 1718 DeclContext *Owner = Record->getDeclContext(); 1719 1720 // Diagnose whether this anonymous struct/union is an extension. 1721 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1722 Diag(Record->getLocation(), diag::ext_anonymous_union); 1723 else if (!Record->isUnion()) 1724 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1725 1726 // C and C++ require different kinds of checks for anonymous 1727 // structs/unions. 1728 bool Invalid = false; 1729 if (getLangOptions().CPlusPlus) { 1730 const char* PrevSpec = 0; 1731 unsigned DiagID; 1732 // C++ [class.union]p3: 1733 // Anonymous unions declared in a named namespace or in the 1734 // global namespace shall be declared static. 1735 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1736 (isa<TranslationUnitDecl>(Owner) || 1737 (isa<NamespaceDecl>(Owner) && 1738 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1739 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1740 Invalid = true; 1741 1742 // Recover by adding 'static'. 1743 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1744 PrevSpec, DiagID); 1745 } 1746 // C++ [class.union]p3: 1747 // A storage class is not allowed in a declaration of an 1748 // anonymous union in a class scope. 1749 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1750 isa<RecordDecl>(Owner)) { 1751 Diag(DS.getStorageClassSpecLoc(), 1752 diag::err_anonymous_union_with_storage_spec); 1753 Invalid = true; 1754 1755 // Recover by removing the storage specifier. 1756 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1757 PrevSpec, DiagID); 1758 } 1759 1760 // C++ [class.union]p2: 1761 // The member-specification of an anonymous union shall only 1762 // define non-static data members. [Note: nested types and 1763 // functions cannot be declared within an anonymous union. ] 1764 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1765 MemEnd = Record->decls_end(); 1766 Mem != MemEnd; ++Mem) { 1767 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1768 // C++ [class.union]p3: 1769 // An anonymous union shall not have private or protected 1770 // members (clause 11). 1771 assert(FD->getAccess() != AS_none); 1772 if (FD->getAccess() != AS_public) { 1773 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1774 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1775 Invalid = true; 1776 } 1777 } else if ((*Mem)->isImplicit()) { 1778 // Any implicit members are fine. 1779 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1780 // This is a type that showed up in an 1781 // elaborated-type-specifier inside the anonymous struct or 1782 // union, but which actually declares a type outside of the 1783 // anonymous struct or union. It's okay. 1784 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1785 if (!MemRecord->isAnonymousStructOrUnion() && 1786 MemRecord->getDeclName()) { 1787 // This is a nested type declaration. 1788 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1789 << (int)Record->isUnion(); 1790 Invalid = true; 1791 } 1792 } else if (isa<AccessSpecDecl>(*Mem)) { 1793 // Any access specifier is fine. 1794 } else { 1795 // We have something that isn't a non-static data 1796 // member. Complain about it. 1797 unsigned DK = diag::err_anonymous_record_bad_member; 1798 if (isa<TypeDecl>(*Mem)) 1799 DK = diag::err_anonymous_record_with_type; 1800 else if (isa<FunctionDecl>(*Mem)) 1801 DK = diag::err_anonymous_record_with_function; 1802 else if (isa<VarDecl>(*Mem)) 1803 DK = diag::err_anonymous_record_with_static; 1804 Diag((*Mem)->getLocation(), DK) 1805 << (int)Record->isUnion(); 1806 Invalid = true; 1807 } 1808 } 1809 } 1810 1811 if (!Record->isUnion() && !Owner->isRecord()) { 1812 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1813 << (int)getLangOptions().CPlusPlus; 1814 Invalid = true; 1815 } 1816 1817 // Mock up a declarator. 1818 Declarator Dc(DS, Declarator::TypeNameContext); 1819 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 1820 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1821 1822 // Create a declaration for this anonymous struct/union. 1823 NamedDecl *Anon = 0; 1824 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1825 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1826 /*IdentifierInfo=*/0, 1827 Context.getTypeDeclType(Record), 1828 TInfo, 1829 /*BitWidth=*/0, /*Mutable=*/false); 1830 Anon->setAccess(AS); 1831 if (getLangOptions().CPlusPlus) { 1832 FieldCollector->Add(cast<FieldDecl>(Anon)); 1833 if (!cast<CXXRecordDecl>(Record)->isEmpty()) 1834 cast<CXXRecordDecl>(OwningClass)->setEmpty(false); 1835 } 1836 } else { 1837 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 1838 assert(SCSpec != DeclSpec::SCS_typedef && 1839 "Parser allowed 'typedef' as storage class VarDecl."); 1840 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec, 0); 1841 if (SCSpec == DeclSpec::SCS_mutable) { 1842 // mutable can only appear on non-static class members, so it's always 1843 // an error here 1844 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1845 Invalid = true; 1846 SC = VarDecl::None; 1847 } 1848 SCSpec = DS.getStorageClassSpecAsWritten(); 1849 VarDecl::StorageClass SCAsWritten 1850 = StorageClassSpecToVarDeclStorageClass(SCSpec, 0); 1851 1852 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1853 /*IdentifierInfo=*/0, 1854 Context.getTypeDeclType(Record), 1855 TInfo, SC, SCAsWritten); 1856 } 1857 Anon->setImplicit(); 1858 1859 // Add the anonymous struct/union object to the current 1860 // context. We'll be referencing this object when we refer to one of 1861 // its members. 1862 Owner->addDecl(Anon); 1863 1864 // Inject the members of the anonymous struct/union into the owning 1865 // context and into the identifier resolver chain for name lookup 1866 // purposes. 1867 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS)) 1868 Invalid = true; 1869 1870 // Mark this as an anonymous struct/union type. Note that we do not 1871 // do this until after we have already checked and injected the 1872 // members of this anonymous struct/union type, because otherwise 1873 // the members could be injected twice: once by DeclContext when it 1874 // builds its lookup table, and once by 1875 // InjectAnonymousStructOrUnionMembers. 1876 Record->setAnonymousStructOrUnion(true); 1877 1878 if (Invalid) 1879 Anon->setInvalidDecl(); 1880 1881 return DeclPtrTy::make(Anon); 1882} 1883 1884 1885/// GetNameForDeclarator - Determine the full declaration name for the 1886/// given Declarator. 1887DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1888 return GetNameFromUnqualifiedId(D.getName()); 1889} 1890 1891/// \brief Retrieves the canonicalized name from a parsed unqualified-id. 1892DeclarationName Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 1893 switch (Name.getKind()) { 1894 case UnqualifiedId::IK_Identifier: 1895 return DeclarationName(Name.Identifier); 1896 1897 case UnqualifiedId::IK_OperatorFunctionId: 1898 return Context.DeclarationNames.getCXXOperatorName( 1899 Name.OperatorFunctionId.Operator); 1900 1901 case UnqualifiedId::IK_LiteralOperatorId: 1902 return Context.DeclarationNames.getCXXLiteralOperatorName( 1903 Name.Identifier); 1904 1905 case UnqualifiedId::IK_ConversionFunctionId: { 1906 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId); 1907 if (Ty.isNull()) 1908 return DeclarationName(); 1909 1910 return Context.DeclarationNames.getCXXConversionFunctionName( 1911 Context.getCanonicalType(Ty)); 1912 } 1913 1914 case UnqualifiedId::IK_ConstructorName: { 1915 QualType Ty = GetTypeFromParser(Name.ConstructorName); 1916 if (Ty.isNull()) 1917 return DeclarationName(); 1918 1919 return Context.DeclarationNames.getCXXConstructorName( 1920 Context.getCanonicalType(Ty)); 1921 } 1922 1923 case UnqualifiedId::IK_ConstructorTemplateId: { 1924 // In well-formed code, we can only have a constructor 1925 // template-id that refers to the current context, so go there 1926 // to find the actual type being constructed. 1927 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 1928 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 1929 return DeclarationName(); 1930 1931 // Determine the type of the class being constructed. 1932 QualType CurClassType = Context.getTypeDeclType(CurClass); 1933 1934 // FIXME: Check two things: that the template-id names the same type as 1935 // CurClassType, and that the template-id does not occur when the name 1936 // was qualified. 1937 1938 return Context.DeclarationNames.getCXXConstructorName( 1939 Context.getCanonicalType(CurClassType)); 1940 } 1941 1942 case UnqualifiedId::IK_DestructorName: { 1943 QualType Ty = GetTypeFromParser(Name.DestructorName); 1944 if (Ty.isNull()) 1945 return DeclarationName(); 1946 1947 return Context.DeclarationNames.getCXXDestructorName( 1948 Context.getCanonicalType(Ty)); 1949 } 1950 1951 case UnqualifiedId::IK_TemplateId: { 1952 TemplateName TName 1953 = TemplateName::getFromVoidPointer(Name.TemplateId->Template); 1954 return Context.getNameForTemplate(TName); 1955 } 1956 } 1957 1958 assert(false && "Unknown name kind"); 1959 return DeclarationName(); 1960} 1961 1962/// isNearlyMatchingFunction - Determine whether the C++ functions 1963/// Declaration and Definition are "nearly" matching. This heuristic 1964/// is used to improve diagnostics in the case where an out-of-line 1965/// function definition doesn't match any declaration within 1966/// the class or namespace. 1967static bool isNearlyMatchingFunction(ASTContext &Context, 1968 FunctionDecl *Declaration, 1969 FunctionDecl *Definition) { 1970 if (Declaration->param_size() != Definition->param_size()) 1971 return false; 1972 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1973 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1974 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1975 1976 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 1977 DefParamTy.getNonReferenceType())) 1978 return false; 1979 } 1980 1981 return true; 1982} 1983 1984/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 1985/// declarator needs to be rebuilt in the current instantiation. 1986/// Any bits of declarator which appear before the name are valid for 1987/// consideration here. That's specifically the type in the decl spec 1988/// and the base type in any member-pointer chunks. 1989static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 1990 DeclarationName Name) { 1991 // The types we specifically need to rebuild are: 1992 // - typenames, typeofs, and decltypes 1993 // - types which will become injected class names 1994 // Of course, we also need to rebuild any type referencing such a 1995 // type. It's safest to just say "dependent", but we call out a 1996 // few cases here. 1997 1998 DeclSpec &DS = D.getMutableDeclSpec(); 1999 switch (DS.getTypeSpecType()) { 2000 case DeclSpec::TST_typename: 2001 case DeclSpec::TST_typeofType: 2002 case DeclSpec::TST_typeofExpr: 2003 case DeclSpec::TST_decltype: { 2004 // Grab the type from the parser. 2005 TypeSourceInfo *TSI = 0; 2006 QualType T = S.GetTypeFromParser(DS.getTypeRep(), &TSI); 2007 if (T.isNull() || !T->isDependentType()) break; 2008 2009 // Make sure there's a type source info. This isn't really much 2010 // of a waste; most dependent types should have type source info 2011 // attached already. 2012 if (!TSI) 2013 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2014 2015 // Rebuild the type in the current instantiation. 2016 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2017 if (!TSI) return true; 2018 2019 // Store the new type back in the decl spec. 2020 QualType LocType = S.CreateLocInfoType(TSI->getType(), TSI); 2021 DS.UpdateTypeRep(LocType.getAsOpaquePtr()); 2022 break; 2023 } 2024 2025 default: 2026 // Nothing to do for these decl specs. 2027 break; 2028 } 2029 2030 // It doesn't matter what order we do this in. 2031 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2032 DeclaratorChunk &Chunk = D.getTypeObject(I); 2033 2034 // The only type information in the declarator which can come 2035 // before the declaration name is the base type of a member 2036 // pointer. 2037 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2038 continue; 2039 2040 // Rebuild the scope specifier in-place. 2041 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2042 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2043 return true; 2044 } 2045 2046 return false; 2047} 2048 2049Sema::DeclPtrTy 2050Sema::HandleDeclarator(Scope *S, Declarator &D, 2051 MultiTemplateParamsArg TemplateParamLists, 2052 bool IsFunctionDefinition) { 2053 DeclarationName Name = GetNameForDeclarator(D); 2054 2055 // All of these full declarators require an identifier. If it doesn't have 2056 // one, the ParsedFreeStandingDeclSpec action should be used. 2057 if (!Name) { 2058 if (!D.isInvalidType()) // Reject this if we think it is valid. 2059 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2060 diag::err_declarator_need_ident) 2061 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2062 return DeclPtrTy(); 2063 } 2064 2065 // The scope passed in may not be a decl scope. Zip up the scope tree until 2066 // we find one that is. 2067 while ((S->getFlags() & Scope::DeclScope) == 0 || 2068 (S->getFlags() & Scope::TemplateParamScope) != 0) 2069 S = S->getParent(); 2070 2071 DeclContext *DC = CurContext; 2072 if (D.getCXXScopeSpec().isInvalid()) 2073 D.setInvalidType(); 2074 else if (D.getCXXScopeSpec().isSet()) { 2075 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2076 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2077 if (!DC) { 2078 // If we could not compute the declaration context, it's because the 2079 // declaration context is dependent but does not refer to a class, 2080 // class template, or class template partial specialization. Complain 2081 // and return early, to avoid the coming semantic disaster. 2082 Diag(D.getIdentifierLoc(), 2083 diag::err_template_qualified_declarator_no_match) 2084 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2085 << D.getCXXScopeSpec().getRange(); 2086 return DeclPtrTy(); 2087 } 2088 2089 bool IsDependentContext = DC->isDependentContext(); 2090 2091 if (!IsDependentContext && 2092 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2093 return DeclPtrTy(); 2094 2095 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 2096 Diag(D.getIdentifierLoc(), 2097 diag::err_member_def_undefined_record) 2098 << Name << DC << D.getCXXScopeSpec().getRange(); 2099 D.setInvalidType(); 2100 } 2101 2102 // Check whether we need to rebuild the type of the given 2103 // declaration in the current instantiation. 2104 if (EnteringContext && IsDependentContext && 2105 TemplateParamLists.size() != 0) { 2106 ContextRAII SavedContext(*this, DC); 2107 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 2108 D.setInvalidType(); 2109 } 2110 } 2111 2112 NamedDecl *New; 2113 2114 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 2115 QualType R = TInfo->getType(); 2116 2117 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 2118 ForRedeclaration); 2119 2120 // See if this is a redefinition of a variable in the same scope. 2121 if (!D.getCXXScopeSpec().isSet()) { 2122 bool IsLinkageLookup = false; 2123 2124 // If the declaration we're planning to build will be a function 2125 // or object with linkage, then look for another declaration with 2126 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 2127 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2128 /* Do nothing*/; 2129 else if (R->isFunctionType()) { 2130 if (CurContext->isFunctionOrMethod() || 2131 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2132 IsLinkageLookup = true; 2133 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 2134 IsLinkageLookup = true; 2135 else if (CurContext->getLookupContext()->isTranslationUnit() && 2136 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2137 IsLinkageLookup = true; 2138 2139 if (IsLinkageLookup) 2140 Previous.clear(LookupRedeclarationWithLinkage); 2141 2142 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 2143 } else { // Something like "int foo::x;" 2144 LookupQualifiedName(Previous, DC); 2145 2146 // Don't consider using declarations as previous declarations for 2147 // out-of-line members. 2148 RemoveUsingDecls(Previous); 2149 2150 // C++ 7.3.1.2p2: 2151 // Members (including explicit specializations of templates) of a named 2152 // namespace can also be defined outside that namespace by explicit 2153 // qualification of the name being defined, provided that the entity being 2154 // defined was already declared in the namespace and the definition appears 2155 // after the point of declaration in a namespace that encloses the 2156 // declarations namespace. 2157 // 2158 // Note that we only check the context at this point. We don't yet 2159 // have enough information to make sure that PrevDecl is actually 2160 // the declaration we want to match. For example, given: 2161 // 2162 // class X { 2163 // void f(); 2164 // void f(float); 2165 // }; 2166 // 2167 // void X::f(int) { } // ill-formed 2168 // 2169 // In this case, PrevDecl will point to the overload set 2170 // containing the two f's declared in X, but neither of them 2171 // matches. 2172 2173 // First check whether we named the global scope. 2174 if (isa<TranslationUnitDecl>(DC)) { 2175 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 2176 << Name << D.getCXXScopeSpec().getRange(); 2177 } else { 2178 DeclContext *Cur = CurContext; 2179 while (isa<LinkageSpecDecl>(Cur)) 2180 Cur = Cur->getParent(); 2181 if (!Cur->Encloses(DC)) { 2182 // The qualifying scope doesn't enclose the original declaration. 2183 // Emit diagnostic based on current scope. 2184 SourceLocation L = D.getIdentifierLoc(); 2185 SourceRange R = D.getCXXScopeSpec().getRange(); 2186 if (isa<FunctionDecl>(Cur)) 2187 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 2188 else 2189 Diag(L, diag::err_invalid_declarator_scope) 2190 << Name << cast<NamedDecl>(DC) << R; 2191 D.setInvalidType(); 2192 } 2193 } 2194 } 2195 2196 if (Previous.isSingleResult() && 2197 Previous.getFoundDecl()->isTemplateParameter()) { 2198 // Maybe we will complain about the shadowed template parameter. 2199 if (!D.isInvalidType()) 2200 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2201 Previous.getFoundDecl())) 2202 D.setInvalidType(); 2203 2204 // Just pretend that we didn't see the previous declaration. 2205 Previous.clear(); 2206 } 2207 2208 // In C++, the previous declaration we find might be a tag type 2209 // (class or enum). In this case, the new declaration will hide the 2210 // tag type. Note that this does does not apply if we're declaring a 2211 // typedef (C++ [dcl.typedef]p4). 2212 if (Previous.isSingleTagDecl() && 2213 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2214 Previous.clear(); 2215 2216 bool Redeclaration = false; 2217 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2218 if (TemplateParamLists.size()) { 2219 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2220 return DeclPtrTy(); 2221 } 2222 2223 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2224 } else if (R->isFunctionType()) { 2225 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2226 move(TemplateParamLists), 2227 IsFunctionDefinition, Redeclaration); 2228 } else { 2229 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2230 move(TemplateParamLists), 2231 Redeclaration); 2232 } 2233 2234 if (New == 0) 2235 return DeclPtrTy(); 2236 2237 // If this has an identifier and is not an invalid redeclaration or 2238 // function template specialization, add it to the scope stack. 2239 if (Name && !(Redeclaration && New->isInvalidDecl())) 2240 PushOnScopeChains(New, S); 2241 2242 return DeclPtrTy::make(New); 2243} 2244 2245/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2246/// types into constant array types in certain situations which would otherwise 2247/// be errors (for GCC compatibility). 2248static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2249 ASTContext &Context, 2250 bool &SizeIsNegative) { 2251 // This method tries to turn a variable array into a constant 2252 // array even when the size isn't an ICE. This is necessary 2253 // for compatibility with code that depends on gcc's buggy 2254 // constant expression folding, like struct {char x[(int)(char*)2];} 2255 SizeIsNegative = false; 2256 2257 QualifierCollector Qs; 2258 const Type *Ty = Qs.strip(T); 2259 2260 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2261 QualType Pointee = PTy->getPointeeType(); 2262 QualType FixedType = 2263 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 2264 if (FixedType.isNull()) return FixedType; 2265 FixedType = Context.getPointerType(FixedType); 2266 return Qs.apply(FixedType); 2267 } 2268 2269 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2270 if (!VLATy) 2271 return QualType(); 2272 // FIXME: We should probably handle this case 2273 if (VLATy->getElementType()->isVariablyModifiedType()) 2274 return QualType(); 2275 2276 Expr::EvalResult EvalResult; 2277 if (!VLATy->getSizeExpr() || 2278 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2279 !EvalResult.Val.isInt()) 2280 return QualType(); 2281 2282 llvm::APSInt &Res = EvalResult.Val.getInt(); 2283 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 2284 // TODO: preserve the size expression in declarator info 2285 return Context.getConstantArrayType(VLATy->getElementType(), 2286 Res, ArrayType::Normal, 0); 2287 } 2288 2289 SizeIsNegative = true; 2290 return QualType(); 2291} 2292 2293/// \brief Register the given locally-scoped external C declaration so 2294/// that it can be found later for redeclarations 2295void 2296Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2297 const LookupResult &Previous, 2298 Scope *S) { 2299 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2300 "Decl is not a locally-scoped decl!"); 2301 // Note that we have a locally-scoped external with this name. 2302 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2303 2304 if (!Previous.isSingleResult()) 2305 return; 2306 2307 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2308 2309 // If there was a previous declaration of this variable, it may be 2310 // in our identifier chain. Update the identifier chain with the new 2311 // declaration. 2312 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2313 // The previous declaration was found on the identifer resolver 2314 // chain, so remove it from its scope. 2315 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 2316 S = S->getParent(); 2317 2318 if (S) 2319 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 2320 } 2321} 2322 2323/// \brief Diagnose function specifiers on a declaration of an identifier that 2324/// does not identify a function. 2325void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2326 // FIXME: We should probably indicate the identifier in question to avoid 2327 // confusion for constructs like "inline int a(), b;" 2328 if (D.getDeclSpec().isInlineSpecified()) 2329 Diag(D.getDeclSpec().getInlineSpecLoc(), 2330 diag::err_inline_non_function); 2331 2332 if (D.getDeclSpec().isVirtualSpecified()) 2333 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2334 diag::err_virtual_non_function); 2335 2336 if (D.getDeclSpec().isExplicitSpecified()) 2337 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2338 diag::err_explicit_non_function); 2339} 2340 2341NamedDecl* 2342Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2343 QualType R, TypeSourceInfo *TInfo, 2344 LookupResult &Previous, bool &Redeclaration) { 2345 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2346 if (D.getCXXScopeSpec().isSet()) { 2347 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2348 << D.getCXXScopeSpec().getRange(); 2349 D.setInvalidType(); 2350 // Pretend we didn't see the scope specifier. 2351 DC = CurContext; 2352 Previous.clear(); 2353 } 2354 2355 if (getLangOptions().CPlusPlus) { 2356 // Check that there are no default arguments (C++ only). 2357 CheckExtraCXXDefaultArguments(D); 2358 } 2359 2360 DiagnoseFunctionSpecifiers(D); 2361 2362 if (D.getDeclSpec().isThreadSpecified()) 2363 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2364 2365 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2366 if (!NewTD) return 0; 2367 2368 // Handle attributes prior to checking for duplicates in MergeVarDecl 2369 ProcessDeclAttributes(S, NewTD, D); 2370 2371 // Merge the decl with the existing one if appropriate. If the decl is 2372 // in an outer scope, it isn't the same thing. 2373 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2374 if (!Previous.empty()) { 2375 Redeclaration = true; 2376 MergeTypeDefDecl(NewTD, Previous); 2377 } 2378 2379 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2380 // then it shall have block scope. 2381 QualType T = NewTD->getUnderlyingType(); 2382 if (T->isVariablyModifiedType()) { 2383 FunctionNeedsScopeChecking() = true; 2384 2385 if (S->getFnParent() == 0) { 2386 bool SizeIsNegative; 2387 QualType FixedTy = 2388 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2389 if (!FixedTy.isNull()) { 2390 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2391 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2392 } else { 2393 if (SizeIsNegative) 2394 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2395 else if (T->isVariableArrayType()) 2396 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2397 else 2398 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2399 NewTD->setInvalidDecl(); 2400 } 2401 } 2402 } 2403 2404 // If this is the C FILE type, notify the AST context. 2405 if (IdentifierInfo *II = NewTD->getIdentifier()) 2406 if (!NewTD->isInvalidDecl() && 2407 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 2408 if (II->isStr("FILE")) 2409 Context.setFILEDecl(NewTD); 2410 else if (II->isStr("jmp_buf")) 2411 Context.setjmp_bufDecl(NewTD); 2412 else if (II->isStr("sigjmp_buf")) 2413 Context.setsigjmp_bufDecl(NewTD); 2414 } 2415 2416 return NewTD; 2417} 2418 2419/// \brief Determines whether the given declaration is an out-of-scope 2420/// previous declaration. 2421/// 2422/// This routine should be invoked when name lookup has found a 2423/// previous declaration (PrevDecl) that is not in the scope where a 2424/// new declaration by the same name is being introduced. If the new 2425/// declaration occurs in a local scope, previous declarations with 2426/// linkage may still be considered previous declarations (C99 2427/// 6.2.2p4-5, C++ [basic.link]p6). 2428/// 2429/// \param PrevDecl the previous declaration found by name 2430/// lookup 2431/// 2432/// \param DC the context in which the new declaration is being 2433/// declared. 2434/// 2435/// \returns true if PrevDecl is an out-of-scope previous declaration 2436/// for a new delcaration with the same name. 2437static bool 2438isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2439 ASTContext &Context) { 2440 if (!PrevDecl) 2441 return 0; 2442 2443 if (!PrevDecl->hasLinkage()) 2444 return false; 2445 2446 if (Context.getLangOptions().CPlusPlus) { 2447 // C++ [basic.link]p6: 2448 // If there is a visible declaration of an entity with linkage 2449 // having the same name and type, ignoring entities declared 2450 // outside the innermost enclosing namespace scope, the block 2451 // scope declaration declares that same entity and receives the 2452 // linkage of the previous declaration. 2453 DeclContext *OuterContext = DC->getLookupContext(); 2454 if (!OuterContext->isFunctionOrMethod()) 2455 // This rule only applies to block-scope declarations. 2456 return false; 2457 else { 2458 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2459 if (PrevOuterContext->isRecord()) 2460 // We found a member function: ignore it. 2461 return false; 2462 else { 2463 // Find the innermost enclosing namespace for the new and 2464 // previous declarations. 2465 while (!OuterContext->isFileContext()) 2466 OuterContext = OuterContext->getParent(); 2467 while (!PrevOuterContext->isFileContext()) 2468 PrevOuterContext = PrevOuterContext->getParent(); 2469 2470 // The previous declaration is in a different namespace, so it 2471 // isn't the same function. 2472 if (OuterContext->getPrimaryContext() != 2473 PrevOuterContext->getPrimaryContext()) 2474 return false; 2475 } 2476 } 2477 } 2478 2479 return true; 2480} 2481 2482static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 2483 CXXScopeSpec &SS = D.getCXXScopeSpec(); 2484 if (!SS.isSet()) return; 2485 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()), 2486 SS.getRange()); 2487} 2488 2489NamedDecl* 2490Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2491 QualType R, TypeSourceInfo *TInfo, 2492 LookupResult &Previous, 2493 MultiTemplateParamsArg TemplateParamLists, 2494 bool &Redeclaration) { 2495 DeclarationName Name = GetNameForDeclarator(D); 2496 2497 // Check that there are no default arguments (C++ only). 2498 if (getLangOptions().CPlusPlus) 2499 CheckExtraCXXDefaultArguments(D); 2500 2501 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 2502 assert(SCSpec != DeclSpec::SCS_typedef && 2503 "Parser allowed 'typedef' as storage class VarDecl."); 2504 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec, 0); 2505 if (SCSpec == DeclSpec::SCS_mutable) { 2506 // mutable can only appear on non-static class members, so it's always 2507 // an error here 2508 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2509 D.setInvalidType(); 2510 SC = VarDecl::None; 2511 } 2512 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 2513 VarDecl::StorageClass SCAsWritten 2514 = StorageClassSpecToVarDeclStorageClass(SCSpec, DC); 2515 2516 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2517 if (!II) { 2518 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2519 << Name.getAsString(); 2520 return 0; 2521 } 2522 2523 DiagnoseFunctionSpecifiers(D); 2524 2525 if (!DC->isRecord() && S->getFnParent() == 0) { 2526 // C99 6.9p2: The storage-class specifiers auto and register shall not 2527 // appear in the declaration specifiers in an external declaration. 2528 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 2529 2530 // If this is a register variable with an asm label specified, then this 2531 // is a GNU extension. 2532 if (SC == VarDecl::Register && D.getAsmLabel()) 2533 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2534 else 2535 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2536 D.setInvalidType(); 2537 } 2538 } 2539 if (DC->isRecord() && !CurContext->isRecord()) { 2540 // This is an out-of-line definition of a static data member. 2541 if (SC == VarDecl::Static) { 2542 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2543 diag::err_static_out_of_line) 2544 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2545 } else if (SC == VarDecl::None) 2546 SC = VarDecl::Static; 2547 } 2548 if (SC == VarDecl::Static) { 2549 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2550 if (RD->isLocalClass()) 2551 Diag(D.getIdentifierLoc(), 2552 diag::err_static_data_member_not_allowed_in_local_class) 2553 << Name << RD->getDeclName(); 2554 } 2555 } 2556 2557 // Match up the template parameter lists with the scope specifier, then 2558 // determine whether we have a template or a template specialization. 2559 bool isExplicitSpecialization = false; 2560 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 2561 if (TemplateParameterList *TemplateParams 2562 = MatchTemplateParametersToScopeSpecifier( 2563 D.getDeclSpec().getSourceRange().getBegin(), 2564 D.getCXXScopeSpec(), 2565 (TemplateParameterList**)TemplateParamLists.get(), 2566 TemplateParamLists.size(), 2567 /*never a friend*/ false, 2568 isExplicitSpecialization)) { 2569 // All but one template parameter lists have been matching. 2570 --NumMatchedTemplateParamLists; 2571 2572 if (TemplateParams->size() > 0) { 2573 // There is no such thing as a variable template. 2574 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2575 << II 2576 << SourceRange(TemplateParams->getTemplateLoc(), 2577 TemplateParams->getRAngleLoc()); 2578 return 0; 2579 } else { 2580 // There is an extraneous 'template<>' for this variable. Complain 2581 // about it, but allow the declaration of the variable. 2582 Diag(TemplateParams->getTemplateLoc(), 2583 diag::err_template_variable_noparams) 2584 << II 2585 << SourceRange(TemplateParams->getTemplateLoc(), 2586 TemplateParams->getRAngleLoc()); 2587 2588 isExplicitSpecialization = true; 2589 } 2590 } 2591 2592 VarDecl *NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2593 II, R, TInfo, SC, SCAsWritten); 2594 2595 if (D.isInvalidType()) 2596 NewVD->setInvalidDecl(); 2597 2598 SetNestedNameSpecifier(NewVD, D); 2599 2600 if (NumMatchedTemplateParamLists > 0) { 2601 NewVD->setTemplateParameterListsInfo(Context, 2602 NumMatchedTemplateParamLists, 2603 (TemplateParameterList**)TemplateParamLists.release()); 2604 } 2605 2606 if (D.getDeclSpec().isThreadSpecified()) { 2607 if (NewVD->hasLocalStorage()) 2608 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2609 else if (!Context.Target.isTLSSupported()) 2610 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2611 else 2612 NewVD->setThreadSpecified(true); 2613 } 2614 2615 // Set the lexical context. If the declarator has a C++ scope specifier, the 2616 // lexical context will be different from the semantic context. 2617 NewVD->setLexicalDeclContext(CurContext); 2618 2619 // Handle attributes prior to checking for duplicates in MergeVarDecl 2620 ProcessDeclAttributes(S, NewVD, D); 2621 2622 // Handle GNU asm-label extension (encoded as an attribute). 2623 if (Expr *E = (Expr*) D.getAsmLabel()) { 2624 // The parser guarantees this is a string. 2625 StringLiteral *SE = cast<StringLiteral>(E); 2626 NewVD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 2627 } 2628 2629 // Diagnose shadowed variables before filtering for scope. 2630 if (!D.getCXXScopeSpec().isSet()) 2631 CheckShadow(S, NewVD, Previous); 2632 2633 // Don't consider existing declarations that are in a different 2634 // scope and are out-of-semantic-context declarations (if the new 2635 // declaration has linkage). 2636 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2637 2638 // Merge the decl with the existing one if appropriate. 2639 if (!Previous.empty()) { 2640 if (Previous.isSingleResult() && 2641 isa<FieldDecl>(Previous.getFoundDecl()) && 2642 D.getCXXScopeSpec().isSet()) { 2643 // The user tried to define a non-static data member 2644 // out-of-line (C++ [dcl.meaning]p1). 2645 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2646 << D.getCXXScopeSpec().getRange(); 2647 Previous.clear(); 2648 NewVD->setInvalidDecl(); 2649 } 2650 } else if (D.getCXXScopeSpec().isSet()) { 2651 // No previous declaration in the qualifying scope. 2652 Diag(D.getIdentifierLoc(), diag::err_no_member) 2653 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2654 << D.getCXXScopeSpec().getRange(); 2655 NewVD->setInvalidDecl(); 2656 } 2657 2658 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2659 2660 // This is an explicit specialization of a static data member. Check it. 2661 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2662 CheckMemberSpecialization(NewVD, Previous)) 2663 NewVD->setInvalidDecl(); 2664 2665 // attributes declared post-definition are currently ignored 2666 if (Previous.isSingleResult()) { 2667 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2668 if (Def && (Def = Def->getDefinition()) && 2669 Def != NewVD && D.hasAttributes()) { 2670 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2671 Diag(Def->getLocation(), diag::note_previous_definition); 2672 } 2673 } 2674 2675 // If this is a locally-scoped extern C variable, update the map of 2676 // such variables. 2677 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2678 !NewVD->isInvalidDecl()) 2679 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2680 2681 return NewVD; 2682} 2683 2684/// \brief Diagnose variable or built-in function shadowing. Implements 2685/// -Wshadow. 2686/// 2687/// This method is called whenever a VarDecl is added to a "useful" 2688/// scope. 2689/// 2690/// \param S the scope in which the shadowing name is being declared 2691/// \param R the lookup of the name 2692/// 2693void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 2694 // Return if warning is ignored. 2695 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow) == Diagnostic::Ignored) 2696 return; 2697 2698 // Don't diagnose declarations at file scope. The scope might not 2699 // have a DeclContext if (e.g.) we're parsing a function prototype. 2700 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity()); 2701 if (NewDC && NewDC->isFileContext()) 2702 return; 2703 2704 // Only diagnose if we're shadowing an unambiguous field or variable. 2705 if (R.getResultKind() != LookupResult::Found) 2706 return; 2707 2708 NamedDecl* ShadowedDecl = R.getFoundDecl(); 2709 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 2710 return; 2711 2712 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 2713 2714 // Only warn about certain kinds of shadowing for class members. 2715 if (NewDC && NewDC->isRecord()) { 2716 // In particular, don't warn about shadowing non-class members. 2717 if (!OldDC->isRecord()) 2718 return; 2719 2720 // TODO: should we warn about static data members shadowing 2721 // static data members from base classes? 2722 2723 // TODO: don't diagnose for inaccessible shadowed members. 2724 // This is hard to do perfectly because we might friend the 2725 // shadowing context, but that's just a false negative. 2726 } 2727 2728 // Determine what kind of declaration we're shadowing. 2729 unsigned Kind; 2730 if (isa<RecordDecl>(OldDC)) { 2731 if (isa<FieldDecl>(ShadowedDecl)) 2732 Kind = 3; // field 2733 else 2734 Kind = 2; // static data member 2735 } else if (OldDC->isFileContext()) 2736 Kind = 1; // global 2737 else 2738 Kind = 0; // local 2739 2740 DeclarationName Name = R.getLookupName(); 2741 2742 // Emit warning and note. 2743 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 2744 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 2745} 2746 2747/// \brief Check -Wshadow without the advantage of a previous lookup. 2748void Sema::CheckShadow(Scope *S, VarDecl *D) { 2749 LookupResult R(*this, D->getDeclName(), D->getLocation(), 2750 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 2751 LookupName(R, S); 2752 CheckShadow(S, D, R); 2753} 2754 2755/// \brief Perform semantic checking on a newly-created variable 2756/// declaration. 2757/// 2758/// This routine performs all of the type-checking required for a 2759/// variable declaration once it has been built. It is used both to 2760/// check variables after they have been parsed and their declarators 2761/// have been translated into a declaration, and to check variables 2762/// that have been instantiated from a template. 2763/// 2764/// Sets NewVD->isInvalidDecl() if an error was encountered. 2765void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2766 LookupResult &Previous, 2767 bool &Redeclaration) { 2768 // If the decl is already known invalid, don't check it. 2769 if (NewVD->isInvalidDecl()) 2770 return; 2771 2772 QualType T = NewVD->getType(); 2773 2774 if (T->isObjCObjectType()) { 2775 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2776 return NewVD->setInvalidDecl(); 2777 } 2778 2779 // Emit an error if an address space was applied to decl with local storage. 2780 // This includes arrays of objects with address space qualifiers, but not 2781 // automatic variables that point to other address spaces. 2782 // ISO/IEC TR 18037 S5.1.2 2783 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2784 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2785 return NewVD->setInvalidDecl(); 2786 } 2787 2788 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2789 && !NewVD->hasAttr<BlocksAttr>()) 2790 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2791 2792 bool isVM = T->isVariablyModifiedType(); 2793 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2794 NewVD->hasAttr<BlocksAttr>() || 2795 // FIXME: We need to diagnose jumps passed initialized variables in C++. 2796 // However, this turns on the scope checker for everything with a variable 2797 // which may impact compile time. See if we can find a better solution 2798 // to this, perhaps only checking functions that contain gotos in C++? 2799 (LangOpts.CPlusPlus && NewVD->hasLocalStorage())) 2800 FunctionNeedsScopeChecking() = true; 2801 2802 if ((isVM && NewVD->hasLinkage()) || 2803 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2804 bool SizeIsNegative; 2805 QualType FixedTy = 2806 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2807 2808 if (FixedTy.isNull() && T->isVariableArrayType()) { 2809 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2810 // FIXME: This won't give the correct result for 2811 // int a[10][n]; 2812 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2813 2814 if (NewVD->isFileVarDecl()) 2815 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2816 << SizeRange; 2817 else if (NewVD->getStorageClass() == VarDecl::Static) 2818 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2819 << SizeRange; 2820 else 2821 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2822 << SizeRange; 2823 return NewVD->setInvalidDecl(); 2824 } 2825 2826 if (FixedTy.isNull()) { 2827 if (NewVD->isFileVarDecl()) 2828 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2829 else 2830 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2831 return NewVD->setInvalidDecl(); 2832 } 2833 2834 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2835 NewVD->setType(FixedTy); 2836 } 2837 2838 if (Previous.empty() && NewVD->isExternC()) { 2839 // Since we did not find anything by this name and we're declaring 2840 // an extern "C" variable, look for a non-visible extern "C" 2841 // declaration with the same name. 2842 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2843 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2844 if (Pos != LocallyScopedExternalDecls.end()) 2845 Previous.addDecl(Pos->second); 2846 } 2847 2848 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2849 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2850 << T; 2851 return NewVD->setInvalidDecl(); 2852 } 2853 2854 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2855 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2856 return NewVD->setInvalidDecl(); 2857 } 2858 2859 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2860 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2861 return NewVD->setInvalidDecl(); 2862 } 2863 2864 if (!Previous.empty()) { 2865 Redeclaration = true; 2866 MergeVarDecl(NewVD, Previous); 2867 } 2868} 2869 2870/// \brief Data used with FindOverriddenMethod 2871struct FindOverriddenMethodData { 2872 Sema *S; 2873 CXXMethodDecl *Method; 2874}; 2875 2876/// \brief Member lookup function that determines whether a given C++ 2877/// method overrides a method in a base class, to be used with 2878/// CXXRecordDecl::lookupInBases(). 2879static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 2880 CXXBasePath &Path, 2881 void *UserData) { 2882 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2883 2884 FindOverriddenMethodData *Data 2885 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 2886 2887 DeclarationName Name = Data->Method->getDeclName(); 2888 2889 // FIXME: Do we care about other names here too? 2890 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2891 // We really want to find the base class destructor here. 2892 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 2893 CanQualType CT = Data->S->Context.getCanonicalType(T); 2894 2895 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 2896 } 2897 2898 for (Path.Decls = BaseRecord->lookup(Name); 2899 Path.Decls.first != Path.Decls.second; 2900 ++Path.Decls.first) { 2901 NamedDecl *D = *Path.Decls.first; 2902 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 2903 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 2904 return true; 2905 } 2906 } 2907 2908 return false; 2909} 2910 2911/// AddOverriddenMethods - See if a method overrides any in the base classes, 2912/// and if so, check that it's a valid override and remember it. 2913void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2914 // Look for virtual methods in base classes that this method might override. 2915 CXXBasePaths Paths; 2916 FindOverriddenMethodData Data; 2917 Data.Method = MD; 2918 Data.S = this; 2919 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 2920 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 2921 E = Paths.found_decls_end(); I != E; ++I) { 2922 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2923 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 2924 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 2925 !CheckOverridingFunctionAttributes(MD, OldMD)) 2926 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 2927 } 2928 } 2929 } 2930} 2931 2932NamedDecl* 2933Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2934 QualType R, TypeSourceInfo *TInfo, 2935 LookupResult &Previous, 2936 MultiTemplateParamsArg TemplateParamLists, 2937 bool IsFunctionDefinition, bool &Redeclaration) { 2938 assert(R.getTypePtr()->isFunctionType()); 2939 2940 DeclarationName Name = GetNameForDeclarator(D); 2941 FunctionDecl::StorageClass SC = FunctionDecl::None; 2942 switch (D.getDeclSpec().getStorageClassSpec()) { 2943 default: assert(0 && "Unknown storage class!"); 2944 case DeclSpec::SCS_auto: 2945 case DeclSpec::SCS_register: 2946 case DeclSpec::SCS_mutable: 2947 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2948 diag::err_typecheck_sclass_func); 2949 D.setInvalidType(); 2950 break; 2951 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2952 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2953 case DeclSpec::SCS_static: { 2954 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2955 // C99 6.7.1p5: 2956 // The declaration of an identifier for a function that has 2957 // block scope shall have no explicit storage-class specifier 2958 // other than extern 2959 // See also (C++ [dcl.stc]p4). 2960 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2961 diag::err_static_block_func); 2962 SC = FunctionDecl::None; 2963 } else 2964 SC = FunctionDecl::Static; 2965 break; 2966 } 2967 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2968 } 2969 2970 if (D.getDeclSpec().isThreadSpecified()) 2971 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2972 2973 bool isFriend = D.getDeclSpec().isFriendSpecified(); 2974 bool isInline = D.getDeclSpec().isInlineSpecified(); 2975 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2976 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2977 2978 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 2979 FunctionDecl::StorageClass SCAsWritten 2980 = StorageClassSpecToFunctionDeclStorageClass(SCSpec, DC); 2981 2982 // Check that the return type is not an abstract class type. 2983 // For record types, this is done by the AbstractClassUsageDiagnoser once 2984 // the class has been completely parsed. 2985 if (!DC->isRecord() && 2986 RequireNonAbstractType(D.getIdentifierLoc(), 2987 R->getAs<FunctionType>()->getResultType(), 2988 diag::err_abstract_type_in_decl, 2989 AbstractReturnType)) 2990 D.setInvalidType(); 2991 2992 // Do not allow returning a objc interface by-value. 2993 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 2994 Diag(D.getIdentifierLoc(), 2995 diag::err_object_cannot_be_passed_returned_by_value) << 0 2996 << R->getAs<FunctionType>()->getResultType(); 2997 D.setInvalidType(); 2998 } 2999 3000 bool isVirtualOkay = false; 3001 FunctionDecl *NewFD; 3002 3003 if (isFriend) { 3004 // C++ [class.friend]p5 3005 // A function can be defined in a friend declaration of a 3006 // class . . . . Such a function is implicitly inline. 3007 isInline |= IsFunctionDefinition; 3008 } 3009 3010 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 3011 // This is a C++ constructor declaration. 3012 assert(DC->isRecord() && 3013 "Constructors can only be declared in a member context"); 3014 3015 R = CheckConstructorDeclarator(D, R, SC); 3016 3017 // Create the new declaration 3018 NewFD = CXXConstructorDecl::Create(Context, 3019 cast<CXXRecordDecl>(DC), 3020 D.getIdentifierLoc(), Name, R, TInfo, 3021 isExplicit, isInline, 3022 /*isImplicitlyDeclared=*/false); 3023 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3024 // This is a C++ destructor declaration. 3025 if (DC->isRecord()) { 3026 R = CheckDestructorDeclarator(D, R, SC); 3027 3028 NewFD = CXXDestructorDecl::Create(Context, 3029 cast<CXXRecordDecl>(DC), 3030 D.getIdentifierLoc(), Name, R, 3031 isInline, 3032 /*isImplicitlyDeclared=*/false); 3033 NewFD->setTypeSourceInfo(TInfo); 3034 3035 isVirtualOkay = true; 3036 } else { 3037 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 3038 3039 // Create a FunctionDecl to satisfy the function definition parsing 3040 // code path. 3041 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 3042 Name, R, TInfo, SC, SCAsWritten, isInline, 3043 /*hasPrototype=*/true); 3044 D.setInvalidType(); 3045 } 3046 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 3047 if (!DC->isRecord()) { 3048 Diag(D.getIdentifierLoc(), 3049 diag::err_conv_function_not_member); 3050 return 0; 3051 } 3052 3053 CheckConversionDeclarator(D, R, SC); 3054 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 3055 D.getIdentifierLoc(), Name, R, TInfo, 3056 isInline, isExplicit); 3057 3058 isVirtualOkay = true; 3059 } else if (DC->isRecord()) { 3060 // If the of the function is the same as the name of the record, then this 3061 // must be an invalid constructor that has a return type. 3062 // (The parser checks for a return type and makes the declarator a 3063 // constructor if it has no return type). 3064 // must have an invalid constructor that has a return type 3065 if (Name.getAsIdentifierInfo() && 3066 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 3067 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 3068 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3069 << SourceRange(D.getIdentifierLoc()); 3070 return 0; 3071 } 3072 3073 bool isStatic = SC == FunctionDecl::Static; 3074 3075 // [class.free]p1: 3076 // Any allocation function for a class T is a static member 3077 // (even if not explicitly declared static). 3078 if (Name.getCXXOverloadedOperator() == OO_New || 3079 Name.getCXXOverloadedOperator() == OO_Array_New) 3080 isStatic = true; 3081 3082 // [class.free]p6 Any deallocation function for a class X is a static member 3083 // (even if not explicitly declared static). 3084 if (Name.getCXXOverloadedOperator() == OO_Delete || 3085 Name.getCXXOverloadedOperator() == OO_Array_Delete) 3086 isStatic = true; 3087 3088 // This is a C++ method declaration. 3089 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 3090 D.getIdentifierLoc(), Name, R, TInfo, 3091 isStatic, SCAsWritten, isInline); 3092 3093 isVirtualOkay = !isStatic; 3094 } else { 3095 // Determine whether the function was written with a 3096 // prototype. This true when: 3097 // - we're in C++ (where every function has a prototype), 3098 // - there is a prototype in the declarator, or 3099 // - the type R of the function is some kind of typedef or other reference 3100 // to a type name (which eventually refers to a function type). 3101 bool HasPrototype = 3102 getLangOptions().CPlusPlus || 3103 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 3104 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 3105 3106 NewFD = FunctionDecl::Create(Context, DC, 3107 D.getIdentifierLoc(), 3108 Name, R, TInfo, SC, SCAsWritten, isInline, 3109 HasPrototype); 3110 } 3111 3112 if (D.isInvalidType()) 3113 NewFD->setInvalidDecl(); 3114 3115 SetNestedNameSpecifier(NewFD, D); 3116 3117 // Set the lexical context. If the declarator has a C++ 3118 // scope specifier, or is the object of a friend declaration, the 3119 // lexical context will be different from the semantic context. 3120 NewFD->setLexicalDeclContext(CurContext); 3121 3122 // Match up the template parameter lists with the scope specifier, then 3123 // determine whether we have a template or a template specialization. 3124 FunctionTemplateDecl *FunctionTemplate = 0; 3125 bool isExplicitSpecialization = false; 3126 bool isFunctionTemplateSpecialization = false; 3127 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 3128 if (TemplateParameterList *TemplateParams 3129 = MatchTemplateParametersToScopeSpecifier( 3130 D.getDeclSpec().getSourceRange().getBegin(), 3131 D.getCXXScopeSpec(), 3132 (TemplateParameterList**)TemplateParamLists.get(), 3133 TemplateParamLists.size(), 3134 isFriend, 3135 isExplicitSpecialization)) { 3136 // All but one template parameter lists have been matching. 3137 --NumMatchedTemplateParamLists; 3138 3139 if (TemplateParams->size() > 0) { 3140 // This is a function template 3141 3142 // Check that we can declare a template here. 3143 if (CheckTemplateDeclScope(S, TemplateParams)) 3144 return 0; 3145 3146 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 3147 NewFD->getLocation(), 3148 Name, TemplateParams, 3149 NewFD); 3150 FunctionTemplate->setLexicalDeclContext(CurContext); 3151 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 3152 } else { 3153 // This is a function template specialization. 3154 isFunctionTemplateSpecialization = true; 3155 3156 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 3157 if (isFriend && isFunctionTemplateSpecialization) { 3158 // We want to remove the "template<>", found here. 3159 SourceRange RemoveRange = TemplateParams->getSourceRange(); 3160 3161 // If we remove the template<> and the name is not a 3162 // template-id, we're actually silently creating a problem: 3163 // the friend declaration will refer to an untemplated decl, 3164 // and clearly the user wants a template specialization. So 3165 // we need to insert '<>' after the name. 3166 SourceLocation InsertLoc; 3167 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 3168 InsertLoc = D.getName().getSourceRange().getEnd(); 3169 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 3170 } 3171 3172 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 3173 << Name << RemoveRange 3174 << FixItHint::CreateRemoval(RemoveRange) 3175 << FixItHint::CreateInsertion(InsertLoc, "<>"); 3176 } 3177 } 3178 } 3179 3180 if (NumMatchedTemplateParamLists > 0) { 3181 NewFD->setTemplateParameterListsInfo(Context, 3182 NumMatchedTemplateParamLists, 3183 (TemplateParameterList**)TemplateParamLists.release()); 3184 } 3185 3186 // C++ [dcl.fct.spec]p5: 3187 // The virtual specifier shall only be used in declarations of 3188 // nonstatic class member functions that appear within a 3189 // member-specification of a class declaration; see 10.3. 3190 // 3191 if (isVirtual && !NewFD->isInvalidDecl()) { 3192 if (!isVirtualOkay) { 3193 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3194 diag::err_virtual_non_function); 3195 } else if (!CurContext->isRecord()) { 3196 // 'virtual' was specified outside of the class. 3197 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 3198 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 3199 } else { 3200 // Okay: Add virtual to the method. 3201 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 3202 CurClass->setMethodAsVirtual(NewFD); 3203 } 3204 } 3205 3206 // C++ [dcl.fct.spec]p6: 3207 // The explicit specifier shall be used only in the declaration of a 3208 // constructor or conversion function within its class definition; see 12.3.1 3209 // and 12.3.2. 3210 if (isExplicit && !NewFD->isInvalidDecl()) { 3211 if (!CurContext->isRecord()) { 3212 // 'explicit' was specified outside of the class. 3213 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3214 diag::err_explicit_out_of_class) 3215 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3216 } else if (!isa<CXXConstructorDecl>(NewFD) && 3217 !isa<CXXConversionDecl>(NewFD)) { 3218 // 'explicit' was specified on a function that wasn't a constructor 3219 // or conversion function. 3220 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3221 diag::err_explicit_non_ctor_or_conv_function) 3222 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3223 } 3224 } 3225 3226 // Filter out previous declarations that don't match the scope. 3227 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3228 3229 if (isFriend) { 3230 // DC is the namespace in which the function is being declared. 3231 assert((DC->isFileContext() || !Previous.empty()) && 3232 "previously-undeclared friend function being created " 3233 "in a non-namespace context"); 3234 3235 // For now, claim that the objects have no previous declaration. 3236 if (FunctionTemplate) { 3237 FunctionTemplate->setObjectOfFriendDecl(false); 3238 FunctionTemplate->setAccess(AS_public); 3239 } 3240 NewFD->setObjectOfFriendDecl(false); 3241 NewFD->setAccess(AS_public); 3242 } 3243 3244 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 3245 !CurContext->isRecord()) { 3246 // C++ [class.static]p1: 3247 // A data or function member of a class may be declared static 3248 // in a class definition, in which case it is a static member of 3249 // the class. 3250 3251 // Complain about the 'static' specifier if it's on an out-of-line 3252 // member function definition. 3253 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3254 diag::err_static_out_of_line) 3255 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3256 } 3257 3258 // Handle GNU asm-label extension (encoded as an attribute). 3259 if (Expr *E = (Expr*) D.getAsmLabel()) { 3260 // The parser guarantees this is a string. 3261 StringLiteral *SE = cast<StringLiteral>(E); 3262 NewFD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 3263 } 3264 3265 // Copy the parameter declarations from the declarator D to the function 3266 // declaration NewFD, if they are available. First scavenge them into Params. 3267 llvm::SmallVector<ParmVarDecl*, 16> Params; 3268 if (D.getNumTypeObjects() > 0) { 3269 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3270 3271 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 3272 // function that takes no arguments, not a function that takes a 3273 // single void argument. 3274 // We let through "const void" here because Sema::GetTypeForDeclarator 3275 // already checks for that case. 3276 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3277 FTI.ArgInfo[0].Param && 3278 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 3279 // Empty arg list, don't push any params. 3280 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 3281 3282 // In C++, the empty parameter-type-list must be spelled "void"; a 3283 // typedef of void is not permitted. 3284 if (getLangOptions().CPlusPlus && 3285 Param->getType().getUnqualifiedType() != Context.VoidTy) 3286 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 3287 // FIXME: Leaks decl? 3288 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 3289 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 3290 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 3291 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 3292 Param->setDeclContext(NewFD); 3293 Params.push_back(Param); 3294 3295 if (Param->isInvalidDecl()) 3296 NewFD->setInvalidDecl(); 3297 } 3298 } 3299 3300 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 3301 // When we're declaring a function with a typedef, typeof, etc as in the 3302 // following example, we'll need to synthesize (unnamed) 3303 // parameters for use in the declaration. 3304 // 3305 // @code 3306 // typedef void fn(int); 3307 // fn f; 3308 // @endcode 3309 3310 // Synthesize a parameter for each argument type. 3311 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3312 AE = FT->arg_type_end(); AI != AE; ++AI) { 3313 ParmVarDecl *Param = 3314 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 3315 Params.push_back(Param); 3316 } 3317 } else { 3318 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 3319 "Should not need args for typedef of non-prototype fn"); 3320 } 3321 // Finally, we know we have the right number of parameters, install them. 3322 NewFD->setParams(Params.data(), Params.size()); 3323 3324 // If the declarator is a template-id, translate the parser's template 3325 // argument list into our AST format. 3326 bool HasExplicitTemplateArgs = false; 3327 TemplateArgumentListInfo TemplateArgs; 3328 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3329 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3330 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3331 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3332 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3333 TemplateId->getTemplateArgs(), 3334 TemplateId->NumArgs); 3335 translateTemplateArguments(TemplateArgsPtr, 3336 TemplateArgs); 3337 TemplateArgsPtr.release(); 3338 3339 HasExplicitTemplateArgs = true; 3340 3341 if (FunctionTemplate) { 3342 // FIXME: Diagnose function template with explicit template 3343 // arguments. 3344 HasExplicitTemplateArgs = false; 3345 } else if (!isFunctionTemplateSpecialization && 3346 !D.getDeclSpec().isFriendSpecified()) { 3347 // We have encountered something that the user meant to be a 3348 // specialization (because it has explicitly-specified template 3349 // arguments) but that was not introduced with a "template<>" (or had 3350 // too few of them). 3351 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3352 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3353 << FixItHint::CreateInsertion( 3354 D.getDeclSpec().getSourceRange().getBegin(), 3355 "template<> "); 3356 isFunctionTemplateSpecialization = true; 3357 } else { 3358 // "friend void foo<>(int);" is an implicit specialization decl. 3359 isFunctionTemplateSpecialization = true; 3360 } 3361 } else if (isFriend && isFunctionTemplateSpecialization) { 3362 // This combination is only possible in a recovery case; the user 3363 // wrote something like: 3364 // template <> friend void foo(int); 3365 // which we're recovering from as if the user had written: 3366 // friend void foo<>(int); 3367 // Go ahead and fake up a template id. 3368 HasExplicitTemplateArgs = true; 3369 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 3370 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 3371 } 3372 3373 // If it's a friend (and only if it's a friend), it's possible 3374 // that either the specialized function type or the specialized 3375 // template is dependent, and therefore matching will fail. In 3376 // this case, don't check the specialization yet. 3377 if (isFunctionTemplateSpecialization && isFriend && 3378 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 3379 assert(HasExplicitTemplateArgs && 3380 "friend function specialization without template args"); 3381 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 3382 Previous)) 3383 NewFD->setInvalidDecl(); 3384 } else if (isFunctionTemplateSpecialization) { 3385 if (CheckFunctionTemplateSpecialization(NewFD, 3386 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3387 Previous)) 3388 NewFD->setInvalidDecl(); 3389 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 3390 if (CheckMemberSpecialization(NewFD, Previous)) 3391 NewFD->setInvalidDecl(); 3392 } 3393 3394 // Perform semantic checking on the function declaration. 3395 bool OverloadableAttrRequired = false; // FIXME: HACK! 3396 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3397 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 3398 3399 assert((NewFD->isInvalidDecl() || !Redeclaration || 3400 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3401 "previous declaration set still overloaded"); 3402 3403 NamedDecl *PrincipalDecl = (FunctionTemplate 3404 ? cast<NamedDecl>(FunctionTemplate) 3405 : NewFD); 3406 3407 if (isFriend && Redeclaration) { 3408 AccessSpecifier Access = AS_public; 3409 if (!NewFD->isInvalidDecl()) 3410 Access = NewFD->getPreviousDeclaration()->getAccess(); 3411 3412 NewFD->setAccess(Access); 3413 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 3414 3415 PrincipalDecl->setObjectOfFriendDecl(true); 3416 } 3417 3418 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 3419 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 3420 PrincipalDecl->setNonMemberOperator(); 3421 3422 // If we have a function template, check the template parameter 3423 // list. This will check and merge default template arguments. 3424 if (FunctionTemplate) { 3425 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3426 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3427 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3428 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3429 : TPC_FunctionTemplate); 3430 } 3431 3432 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 3433 // Fake up an access specifier if it's supposed to be a class member. 3434 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext())) 3435 NewFD->setAccess(AS_public); 3436 3437 // An out-of-line member function declaration must also be a 3438 // definition (C++ [dcl.meaning]p1). 3439 // Note that this is not the case for explicit specializations of 3440 // function templates or member functions of class templates, per 3441 // C++ [temp.expl.spec]p2. 3442 if (!IsFunctionDefinition && !isFriend && 3443 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 3444 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 3445 << D.getCXXScopeSpec().getRange(); 3446 NewFD->setInvalidDecl(); 3447 } else if (!Redeclaration && 3448 !(isFriend && CurContext->isDependentContext())) { 3449 // The user tried to provide an out-of-line definition for a 3450 // function that is a member of a class or namespace, but there 3451 // was no such member function declared (C++ [class.mfct]p2, 3452 // C++ [namespace.memdef]p2). For example: 3453 // 3454 // class X { 3455 // void f() const; 3456 // }; 3457 // 3458 // void X::f() { } // ill-formed 3459 // 3460 // Complain about this problem, and attempt to suggest close 3461 // matches (e.g., those that differ only in cv-qualifiers and 3462 // whether the parameter types are references). 3463 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3464 << Name << DC << D.getCXXScopeSpec().getRange(); 3465 NewFD->setInvalidDecl(); 3466 3467 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 3468 ForRedeclaration); 3469 LookupQualifiedName(Prev, DC); 3470 assert(!Prev.isAmbiguous() && 3471 "Cannot have an ambiguity in previous-declaration lookup"); 3472 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3473 Func != FuncEnd; ++Func) { 3474 if (isa<FunctionDecl>(*Func) && 3475 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 3476 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3477 } 3478 } 3479 } 3480 3481 // Handle attributes. We need to have merged decls when handling attributes 3482 // (for example to check for conflicts, etc). 3483 // FIXME: This needs to happen before we merge declarations. Then, 3484 // let attribute merging cope with attribute conflicts. 3485 ProcessDeclAttributes(S, NewFD, D); 3486 3487 // attributes declared post-definition are currently ignored 3488 if (Redeclaration && Previous.isSingleResult()) { 3489 const FunctionDecl *Def; 3490 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3491 if (PrevFD && PrevFD->getBody(Def) && D.hasAttributes()) { 3492 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3493 Diag(Def->getLocation(), diag::note_previous_definition); 3494 } 3495 } 3496 3497 AddKnownFunctionAttributes(NewFD); 3498 3499 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 3500 // If a function name is overloadable in C, then every function 3501 // with that name must be marked "overloadable". 3502 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3503 << Redeclaration << NewFD; 3504 if (!Previous.empty()) 3505 Diag(Previous.getRepresentativeDecl()->getLocation(), 3506 diag::note_attribute_overloadable_prev_overload); 3507 NewFD->addAttr(::new (Context) OverloadableAttr()); 3508 } 3509 3510 // If this is a locally-scoped extern C function, update the 3511 // map of such names. 3512 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3513 && !NewFD->isInvalidDecl()) 3514 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3515 3516 // Set this FunctionDecl's range up to the right paren. 3517 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3518 3519 if (FunctionTemplate && NewFD->isInvalidDecl()) 3520 FunctionTemplate->setInvalidDecl(); 3521 3522 if (FunctionTemplate) 3523 return FunctionTemplate; 3524 3525 3526 // Keep track of static, non-inlined function definitions that 3527 // have not been used. We will warn later. 3528 // FIXME: Also include static functions declared but not defined. 3529 if (!NewFD->isInvalidDecl() && IsFunctionDefinition 3530 && !NewFD->isInlined() && NewFD->getLinkage() == InternalLinkage 3531 && !NewFD->isUsed() && !NewFD->hasAttr<UnusedAttr>() 3532 && !NewFD->hasAttr<ConstructorAttr>() 3533 && !NewFD->hasAttr<DestructorAttr>()) 3534 UnusedStaticFuncs.push_back(NewFD); 3535 3536 return NewFD; 3537} 3538 3539/// \brief Perform semantic checking of a new function declaration. 3540/// 3541/// Performs semantic analysis of the new function declaration 3542/// NewFD. This routine performs all semantic checking that does not 3543/// require the actual declarator involved in the declaration, and is 3544/// used both for the declaration of functions as they are parsed 3545/// (called via ActOnDeclarator) and for the declaration of functions 3546/// that have been instantiated via C++ template instantiation (called 3547/// via InstantiateDecl). 3548/// 3549/// \param IsExplicitSpecialiation whether this new function declaration is 3550/// an explicit specialization of the previous declaration. 3551/// 3552/// This sets NewFD->isInvalidDecl() to true if there was an error. 3553void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3554 LookupResult &Previous, 3555 bool IsExplicitSpecialization, 3556 bool &Redeclaration, 3557 bool &OverloadableAttrRequired) { 3558 // If NewFD is already known erroneous, don't do any of this checking. 3559 if (NewFD->isInvalidDecl()) 3560 return; 3561 3562 if (NewFD->getResultType()->isVariablyModifiedType()) { 3563 // Functions returning a variably modified type violate C99 6.7.5.2p2 3564 // because all functions have linkage. 3565 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3566 return NewFD->setInvalidDecl(); 3567 } 3568 3569 if (NewFD->isMain()) 3570 CheckMain(NewFD); 3571 3572 // Check for a previous declaration of this name. 3573 if (Previous.empty() && NewFD->isExternC()) { 3574 // Since we did not find anything by this name and we're declaring 3575 // an extern "C" function, look for a non-visible extern "C" 3576 // declaration with the same name. 3577 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3578 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3579 if (Pos != LocallyScopedExternalDecls.end()) 3580 Previous.addDecl(Pos->second); 3581 } 3582 3583 // Merge or overload the declaration with an existing declaration of 3584 // the same name, if appropriate. 3585 if (!Previous.empty()) { 3586 // Determine whether NewFD is an overload of PrevDecl or 3587 // a declaration that requires merging. If it's an overload, 3588 // there's no more work to do here; we'll just add the new 3589 // function to the scope. 3590 3591 NamedDecl *OldDecl = 0; 3592 if (!AllowOverloadingOfFunction(Previous, Context)) { 3593 Redeclaration = true; 3594 OldDecl = Previous.getFoundDecl(); 3595 } else { 3596 if (!getLangOptions().CPlusPlus) { 3597 OverloadableAttrRequired = true; 3598 3599 // Functions marked "overloadable" must have a prototype (that 3600 // we can't get through declaration merging). 3601 if (!NewFD->getType()->getAs<FunctionProtoType>()) { 3602 Diag(NewFD->getLocation(), 3603 diag::err_attribute_overloadable_no_prototype) 3604 << NewFD; 3605 Redeclaration = true; 3606 3607 // Turn this into a variadic function with no parameters. 3608 QualType R = Context.getFunctionType( 3609 NewFD->getType()->getAs<FunctionType>()->getResultType(), 3610 0, 0, true, 0, false, false, 0, 0, 3611 FunctionType::ExtInfo()); 3612 NewFD->setType(R); 3613 return NewFD->setInvalidDecl(); 3614 } 3615 } 3616 3617 switch (CheckOverload(S, NewFD, Previous, OldDecl, 3618 /*NewIsUsingDecl*/ false)) { 3619 case Ovl_Match: 3620 Redeclaration = true; 3621 break; 3622 3623 case Ovl_NonFunction: 3624 Redeclaration = true; 3625 break; 3626 3627 case Ovl_Overload: 3628 Redeclaration = false; 3629 break; 3630 } 3631 } 3632 3633 if (Redeclaration) { 3634 // NewFD and OldDecl represent declarations that need to be 3635 // merged. 3636 if (MergeFunctionDecl(NewFD, OldDecl)) 3637 return NewFD->setInvalidDecl(); 3638 3639 Previous.clear(); 3640 Previous.addDecl(OldDecl); 3641 3642 if (FunctionTemplateDecl *OldTemplateDecl 3643 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3644 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3645 FunctionTemplateDecl *NewTemplateDecl 3646 = NewFD->getDescribedFunctionTemplate(); 3647 assert(NewTemplateDecl && "Template/non-template mismatch"); 3648 if (CXXMethodDecl *Method 3649 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3650 Method->setAccess(OldTemplateDecl->getAccess()); 3651 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3652 } 3653 3654 // If this is an explicit specialization of a member that is a function 3655 // template, mark it as a member specialization. 3656 if (IsExplicitSpecialization && 3657 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3658 NewTemplateDecl->setMemberSpecialization(); 3659 assert(OldTemplateDecl->isMemberSpecialization()); 3660 } 3661 } else { 3662 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3663 NewFD->setAccess(OldDecl->getAccess()); 3664 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3665 } 3666 } 3667 } 3668 3669 // Semantic checking for this function declaration (in isolation). 3670 if (getLangOptions().CPlusPlus) { 3671 // C++-specific checks. 3672 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3673 CheckConstructor(Constructor); 3674 } else if (CXXDestructorDecl *Destructor = 3675 dyn_cast<CXXDestructorDecl>(NewFD)) { 3676 CXXRecordDecl *Record = Destructor->getParent(); 3677 QualType ClassType = Context.getTypeDeclType(Record); 3678 3679 // FIXME: Shouldn't we be able to perform thisc heck even when the class 3680 // type is dependent? Both gcc and edg can handle that. 3681 if (!ClassType->isDependentType()) { 3682 DeclarationName Name 3683 = Context.DeclarationNames.getCXXDestructorName( 3684 Context.getCanonicalType(ClassType)); 3685 if (NewFD->getDeclName() != Name) { 3686 Diag(NewFD->getLocation(), diag::err_destructor_name); 3687 return NewFD->setInvalidDecl(); 3688 } 3689 } 3690 3691 Record->setUserDeclaredDestructor(true); 3692 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3693 // user-defined destructor. 3694 Record->setPOD(false); 3695 3696 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3697 // declared destructor. 3698 // FIXME: C++0x: don't do this for "= default" destructors 3699 Record->setHasTrivialDestructor(false); 3700 } else if (CXXConversionDecl *Conversion 3701 = dyn_cast<CXXConversionDecl>(NewFD)) { 3702 ActOnConversionDeclarator(Conversion); 3703 } 3704 3705 // Find any virtual functions that this function overrides. 3706 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3707 if (!Method->isFunctionTemplateSpecialization() && 3708 !Method->getDescribedFunctionTemplate()) 3709 AddOverriddenMethods(Method->getParent(), Method); 3710 } 3711 3712 // Additional checks for the destructor; make sure we do this after we 3713 // figure out whether the destructor is virtual. 3714 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(NewFD)) 3715 if (!Destructor->getParent()->isDependentType()) 3716 CheckDestructor(Destructor); 3717 3718 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3719 if (NewFD->isOverloadedOperator() && 3720 CheckOverloadedOperatorDeclaration(NewFD)) 3721 return NewFD->setInvalidDecl(); 3722 3723 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3724 if (NewFD->getLiteralIdentifier() && 3725 CheckLiteralOperatorDeclaration(NewFD)) 3726 return NewFD->setInvalidDecl(); 3727 3728 // In C++, check default arguments now that we have merged decls. Unless 3729 // the lexical context is the class, because in this case this is done 3730 // during delayed parsing anyway. 3731 if (!CurContext->isRecord()) 3732 CheckCXXDefaultArguments(NewFD); 3733 } 3734} 3735 3736void Sema::CheckMain(FunctionDecl* FD) { 3737 // C++ [basic.start.main]p3: A program that declares main to be inline 3738 // or static is ill-formed. 3739 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3740 // shall not appear in a declaration of main. 3741 // static main is not an error under C99, but we should warn about it. 3742 bool isInline = FD->isInlineSpecified(); 3743 bool isStatic = FD->getStorageClass() == FunctionDecl::Static; 3744 if (isInline || isStatic) { 3745 unsigned diagID = diag::warn_unusual_main_decl; 3746 if (isInline || getLangOptions().CPlusPlus) 3747 diagID = diag::err_unusual_main_decl; 3748 3749 int which = isStatic + (isInline << 1) - 1; 3750 Diag(FD->getLocation(), diagID) << which; 3751 } 3752 3753 QualType T = FD->getType(); 3754 assert(T->isFunctionType() && "function decl is not of function type"); 3755 const FunctionType* FT = T->getAs<FunctionType>(); 3756 3757 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3758 // TODO: add a replacement fixit to turn the return type into 'int'. 3759 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3760 FD->setInvalidDecl(true); 3761 } 3762 3763 // Treat protoless main() as nullary. 3764 if (isa<FunctionNoProtoType>(FT)) return; 3765 3766 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3767 unsigned nparams = FTP->getNumArgs(); 3768 assert(FD->getNumParams() == nparams); 3769 3770 bool HasExtraParameters = (nparams > 3); 3771 3772 // Darwin passes an undocumented fourth argument of type char**. If 3773 // other platforms start sprouting these, the logic below will start 3774 // getting shifty. 3775 if (nparams == 4 && 3776 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 3777 HasExtraParameters = false; 3778 3779 if (HasExtraParameters) { 3780 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 3781 FD->setInvalidDecl(true); 3782 nparams = 3; 3783 } 3784 3785 // FIXME: a lot of the following diagnostics would be improved 3786 // if we had some location information about types. 3787 3788 QualType CharPP = 3789 Context.getPointerType(Context.getPointerType(Context.CharTy)); 3790 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 3791 3792 for (unsigned i = 0; i < nparams; ++i) { 3793 QualType AT = FTP->getArgType(i); 3794 3795 bool mismatch = true; 3796 3797 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 3798 mismatch = false; 3799 else if (Expected[i] == CharPP) { 3800 // As an extension, the following forms are okay: 3801 // char const ** 3802 // char const * const * 3803 // char * const * 3804 3805 QualifierCollector qs; 3806 const PointerType* PT; 3807 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 3808 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 3809 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 3810 qs.removeConst(); 3811 mismatch = !qs.empty(); 3812 } 3813 } 3814 3815 if (mismatch) { 3816 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 3817 // TODO: suggest replacing given type with expected type 3818 FD->setInvalidDecl(true); 3819 } 3820 } 3821 3822 if (nparams == 1 && !FD->isInvalidDecl()) { 3823 Diag(FD->getLocation(), diag::warn_main_one_arg); 3824 } 3825} 3826 3827bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 3828 // FIXME: Need strict checking. In C89, we need to check for 3829 // any assignment, increment, decrement, function-calls, or 3830 // commas outside of a sizeof. In C99, it's the same list, 3831 // except that the aforementioned are allowed in unevaluated 3832 // expressions. Everything else falls under the 3833 // "may accept other forms of constant expressions" exception. 3834 // (We never end up here for C++, so the constant expression 3835 // rules there don't matter.) 3836 if (Init->isConstantInitializer(Context)) 3837 return false; 3838 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 3839 << Init->getSourceRange(); 3840 return true; 3841} 3842 3843void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 3844 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 3845} 3846 3847/// AddInitializerToDecl - Adds the initializer Init to the 3848/// declaration dcl. If DirectInit is true, this is C++ direct 3849/// initialization rather than copy initialization. 3850void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 3851 Decl *RealDecl = dcl.getAs<Decl>(); 3852 // If there is no declaration, there was an error parsing it. Just ignore 3853 // the initializer. 3854 if (RealDecl == 0) 3855 return; 3856 3857 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 3858 // With declarators parsed the way they are, the parser cannot 3859 // distinguish between a normal initializer and a pure-specifier. 3860 // Thus this grotesque test. 3861 IntegerLiteral *IL; 3862 Expr *Init = static_cast<Expr *>(init.get()); 3863 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 3864 Context.getCanonicalType(IL->getType()) == Context.IntTy) 3865 CheckPureMethod(Method, Init->getSourceRange()); 3866 else { 3867 Diag(Method->getLocation(), diag::err_member_function_initialization) 3868 << Method->getDeclName() << Init->getSourceRange(); 3869 Method->setInvalidDecl(); 3870 } 3871 return; 3872 } 3873 3874 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3875 if (!VDecl) { 3876 if (getLangOptions().CPlusPlus && 3877 RealDecl->getLexicalDeclContext()->isRecord() && 3878 isa<NamedDecl>(RealDecl)) 3879 Diag(RealDecl->getLocation(), diag::err_member_initialization) 3880 << cast<NamedDecl>(RealDecl)->getDeclName(); 3881 else 3882 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3883 RealDecl->setInvalidDecl(); 3884 return; 3885 } 3886 3887 // A definition must end up with a complete type, which means it must be 3888 // complete with the restriction that an array type might be completed by the 3889 // initializer; note that later code assumes this restriction. 3890 QualType BaseDeclType = VDecl->getType(); 3891 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 3892 BaseDeclType = Array->getElementType(); 3893 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 3894 diag::err_typecheck_decl_incomplete_type)) { 3895 RealDecl->setInvalidDecl(); 3896 return; 3897 } 3898 3899 // The variable can not have an abstract class type. 3900 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 3901 diag::err_abstract_type_in_decl, 3902 AbstractVariableType)) 3903 VDecl->setInvalidDecl(); 3904 3905 const VarDecl *Def; 3906 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 3907 Diag(VDecl->getLocation(), diag::err_redefinition) 3908 << VDecl->getDeclName(); 3909 Diag(Def->getLocation(), diag::note_previous_definition); 3910 VDecl->setInvalidDecl(); 3911 return; 3912 } 3913 3914 // Take ownership of the expression, now that we're sure we have somewhere 3915 // to put it. 3916 Expr *Init = init.takeAs<Expr>(); 3917 assert(Init && "missing initializer"); 3918 3919 // Capture the variable that is being initialized and the style of 3920 // initialization. 3921 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 3922 3923 // FIXME: Poor source location information. 3924 InitializationKind Kind 3925 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 3926 Init->getLocStart(), 3927 Init->getLocEnd()) 3928 : InitializationKind::CreateCopy(VDecl->getLocation(), 3929 Init->getLocStart()); 3930 3931 // Get the decls type and save a reference for later, since 3932 // CheckInitializerTypes may change it. 3933 QualType DclT = VDecl->getType(), SavT = DclT; 3934 if (VDecl->isBlockVarDecl()) { 3935 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 3936 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 3937 VDecl->setInvalidDecl(); 3938 } else if (!VDecl->isInvalidDecl()) { 3939 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3940 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3941 MultiExprArg(*this, (void**)&Init, 1), 3942 &DclT); 3943 if (Result.isInvalid()) { 3944 VDecl->setInvalidDecl(); 3945 return; 3946 } 3947 3948 Init = Result.takeAs<Expr>(); 3949 3950 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3951 // Don't check invalid declarations to avoid emitting useless diagnostics. 3952 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3953 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 3954 CheckForConstantInitializer(Init, DclT); 3955 } 3956 } 3957 } else if (VDecl->isStaticDataMember() && 3958 VDecl->getLexicalDeclContext()->isRecord()) { 3959 // This is an in-class initialization for a static data member, e.g., 3960 // 3961 // struct S { 3962 // static const int value = 17; 3963 // }; 3964 3965 // Attach the initializer 3966 VDecl->setInit(Init); 3967 3968 // C++ [class.mem]p4: 3969 // A member-declarator can contain a constant-initializer only 3970 // if it declares a static member (9.4) of const integral or 3971 // const enumeration type, see 9.4.2. 3972 QualType T = VDecl->getType(); 3973 if (!T->isDependentType() && 3974 (!Context.getCanonicalType(T).isConstQualified() || 3975 !T->isIntegralOrEnumerationType())) { 3976 Diag(VDecl->getLocation(), diag::err_member_initialization) 3977 << VDecl->getDeclName() << Init->getSourceRange(); 3978 VDecl->setInvalidDecl(); 3979 } else { 3980 // C++ [class.static.data]p4: 3981 // If a static data member is of const integral or const 3982 // enumeration type, its declaration in the class definition 3983 // can specify a constant-initializer which shall be an 3984 // integral constant expression (5.19). 3985 if (!Init->isTypeDependent() && 3986 !Init->getType()->isIntegralOrEnumerationType()) { 3987 // We have a non-dependent, non-integral or enumeration type. 3988 Diag(Init->getSourceRange().getBegin(), 3989 diag::err_in_class_initializer_non_integral_type) 3990 << Init->getType() << Init->getSourceRange(); 3991 VDecl->setInvalidDecl(); 3992 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 3993 // Check whether the expression is a constant expression. 3994 llvm::APSInt Value; 3995 SourceLocation Loc; 3996 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 3997 Diag(Loc, diag::err_in_class_initializer_non_constant) 3998 << Init->getSourceRange(); 3999 VDecl->setInvalidDecl(); 4000 } else if (!VDecl->getType()->isDependentType()) 4001 ImpCastExprToType(Init, VDecl->getType(), CastExpr::CK_IntegralCast); 4002 } 4003 } 4004 } else if (VDecl->isFileVarDecl()) { 4005 if (VDecl->getStorageClass() == VarDecl::Extern && 4006 (!getLangOptions().CPlusPlus || 4007 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 4008 Diag(VDecl->getLocation(), diag::warn_extern_init); 4009 if (!VDecl->isInvalidDecl()) { 4010 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4011 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4012 MultiExprArg(*this, (void**)&Init, 1), 4013 &DclT); 4014 if (Result.isInvalid()) { 4015 VDecl->setInvalidDecl(); 4016 return; 4017 } 4018 4019 Init = Result.takeAs<Expr>(); 4020 } 4021 4022 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4023 // Don't check invalid declarations to avoid emitting useless diagnostics. 4024 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4025 // C99 6.7.8p4. All file scoped initializers need to be constant. 4026 CheckForConstantInitializer(Init, DclT); 4027 } 4028 } 4029 // If the type changed, it means we had an incomplete type that was 4030 // completed by the initializer. For example: 4031 // int ary[] = { 1, 3, 5 }; 4032 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 4033 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 4034 VDecl->setType(DclT); 4035 Init->setType(DclT); 4036 } 4037 4038 Init = MaybeCreateCXXExprWithTemporaries(Init); 4039 // Attach the initializer to the decl. 4040 VDecl->setInit(Init); 4041 4042 if (getLangOptions().CPlusPlus) { 4043 // Make sure we mark the destructor as used if necessary. 4044 QualType InitType = VDecl->getType(); 4045 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 4046 InitType = Context.getBaseElementType(Array); 4047 if (const RecordType *Record = InitType->getAs<RecordType>()) 4048 FinalizeVarWithDestructor(VDecl, Record); 4049 } 4050 4051 return; 4052} 4053 4054/// ActOnInitializerError - Given that there was an error parsing an 4055/// initializer for the given declaration, try to return to some form 4056/// of sanity. 4057void Sema::ActOnInitializerError(DeclPtrTy dcl) { 4058 // Our main concern here is re-establishing invariants like "a 4059 // variable's type is either dependent or complete". 4060 Decl *D = dcl.getAs<Decl>(); 4061 if (!D || D->isInvalidDecl()) return; 4062 4063 VarDecl *VD = dyn_cast<VarDecl>(D); 4064 if (!VD) return; 4065 4066 QualType Ty = VD->getType(); 4067 if (Ty->isDependentType()) return; 4068 4069 // Require a complete type. 4070 if (RequireCompleteType(VD->getLocation(), 4071 Context.getBaseElementType(Ty), 4072 diag::err_typecheck_decl_incomplete_type)) { 4073 VD->setInvalidDecl(); 4074 return; 4075 } 4076 4077 // Require an abstract type. 4078 if (RequireNonAbstractType(VD->getLocation(), Ty, 4079 diag::err_abstract_type_in_decl, 4080 AbstractVariableType)) { 4081 VD->setInvalidDecl(); 4082 return; 4083 } 4084 4085 // Don't bother complaining about constructors or destructors, 4086 // though. 4087} 4088 4089void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 4090 bool TypeContainsUndeducedAuto) { 4091 Decl *RealDecl = dcl.getAs<Decl>(); 4092 4093 // If there is no declaration, there was an error parsing it. Just ignore it. 4094 if (RealDecl == 0) 4095 return; 4096 4097 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 4098 QualType Type = Var->getType(); 4099 4100 // C++0x [dcl.spec.auto]p3 4101 if (TypeContainsUndeducedAuto) { 4102 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 4103 << Var->getDeclName() << Type; 4104 Var->setInvalidDecl(); 4105 return; 4106 } 4107 4108 switch (Var->isThisDeclarationADefinition()) { 4109 case VarDecl::Definition: 4110 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 4111 break; 4112 4113 // We have an out-of-line definition of a static data member 4114 // that has an in-class initializer, so we type-check this like 4115 // a declaration. 4116 // 4117 // Fall through 4118 4119 case VarDecl::DeclarationOnly: 4120 // It's only a declaration. 4121 4122 // Block scope. C99 6.7p7: If an identifier for an object is 4123 // declared with no linkage (C99 6.2.2p6), the type for the 4124 // object shall be complete. 4125 if (!Type->isDependentType() && Var->isBlockVarDecl() && 4126 !Var->getLinkage() && !Var->isInvalidDecl() && 4127 RequireCompleteType(Var->getLocation(), Type, 4128 diag::err_typecheck_decl_incomplete_type)) 4129 Var->setInvalidDecl(); 4130 4131 // Make sure that the type is not abstract. 4132 if (!Type->isDependentType() && !Var->isInvalidDecl() && 4133 RequireNonAbstractType(Var->getLocation(), Type, 4134 diag::err_abstract_type_in_decl, 4135 AbstractVariableType)) 4136 Var->setInvalidDecl(); 4137 return; 4138 4139 case VarDecl::TentativeDefinition: 4140 // File scope. C99 6.9.2p2: A declaration of an identifier for an 4141 // object that has file scope without an initializer, and without a 4142 // storage-class specifier or with the storage-class specifier "static", 4143 // constitutes a tentative definition. Note: A tentative definition with 4144 // external linkage is valid (C99 6.2.2p5). 4145 if (!Var->isInvalidDecl()) { 4146 if (const IncompleteArrayType *ArrayT 4147 = Context.getAsIncompleteArrayType(Type)) { 4148 if (RequireCompleteType(Var->getLocation(), 4149 ArrayT->getElementType(), 4150 diag::err_illegal_decl_array_incomplete_type)) 4151 Var->setInvalidDecl(); 4152 } else if (Var->getStorageClass() == VarDecl::Static) { 4153 // C99 6.9.2p3: If the declaration of an identifier for an object is 4154 // a tentative definition and has internal linkage (C99 6.2.2p3), the 4155 // declared type shall not be an incomplete type. 4156 // NOTE: code such as the following 4157 // static struct s; 4158 // struct s { int a; }; 4159 // is accepted by gcc. Hence here we issue a warning instead of 4160 // an error and we do not invalidate the static declaration. 4161 // NOTE: to avoid multiple warnings, only check the first declaration. 4162 if (Var->getPreviousDeclaration() == 0) 4163 RequireCompleteType(Var->getLocation(), Type, 4164 diag::ext_typecheck_decl_incomplete_type); 4165 } 4166 } 4167 4168 // Record the tentative definition; we're done. 4169 if (!Var->isInvalidDecl()) 4170 TentativeDefinitions.push_back(Var); 4171 return; 4172 } 4173 4174 // Provide a specific diagnostic for uninitialized variable 4175 // definitions with incomplete array type. 4176 if (Type->isIncompleteArrayType()) { 4177 Diag(Var->getLocation(), 4178 diag::err_typecheck_incomplete_array_needs_initializer); 4179 Var->setInvalidDecl(); 4180 return; 4181 } 4182 4183 // Provide a specific diagnostic for uninitialized variable 4184 // definitions with reference type. 4185 if (Type->isReferenceType()) { 4186 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 4187 << Var->getDeclName() 4188 << SourceRange(Var->getLocation(), Var->getLocation()); 4189 Var->setInvalidDecl(); 4190 return; 4191 } 4192 4193 // Do not attempt to type-check the default initializer for a 4194 // variable with dependent type. 4195 if (Type->isDependentType()) 4196 return; 4197 4198 if (Var->isInvalidDecl()) 4199 return; 4200 4201 if (RequireCompleteType(Var->getLocation(), 4202 Context.getBaseElementType(Type), 4203 diag::err_typecheck_decl_incomplete_type)) { 4204 Var->setInvalidDecl(); 4205 return; 4206 } 4207 4208 // The variable can not have an abstract class type. 4209 if (RequireNonAbstractType(Var->getLocation(), Type, 4210 diag::err_abstract_type_in_decl, 4211 AbstractVariableType)) { 4212 Var->setInvalidDecl(); 4213 return; 4214 } 4215 4216 const RecordType *Record 4217 = Context.getBaseElementType(Type)->getAs<RecordType>(); 4218 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 4219 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 4220 // C++03 [dcl.init]p9: 4221 // If no initializer is specified for an object, and the 4222 // object is of (possibly cv-qualified) non-POD class type (or 4223 // array thereof), the object shall be default-initialized; if 4224 // the object is of const-qualified type, the underlying class 4225 // type shall have a user-declared default 4226 // constructor. Otherwise, if no initializer is specified for 4227 // a non- static object, the object and its subobjects, if 4228 // any, have an indeterminate initial value); if the object 4229 // or any of its subobjects are of const-qualified type, the 4230 // program is ill-formed. 4231 // FIXME: DPG thinks it is very fishy that C++0x disables this. 4232 } else { 4233 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 4234 InitializationKind Kind 4235 = InitializationKind::CreateDefault(Var->getLocation()); 4236 4237 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 4238 OwningExprResult Init = InitSeq.Perform(*this, Entity, Kind, 4239 MultiExprArg(*this, 0, 0)); 4240 if (Init.isInvalid()) 4241 Var->setInvalidDecl(); 4242 else if (Init.get()) 4243 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 4244 } 4245 4246 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record) 4247 FinalizeVarWithDestructor(Var, Record); 4248 } 4249} 4250 4251Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 4252 DeclPtrTy *Group, 4253 unsigned NumDecls) { 4254 llvm::SmallVector<Decl*, 8> Decls; 4255 4256 if (DS.isTypeSpecOwned()) 4257 Decls.push_back((Decl*)DS.getTypeRep()); 4258 4259 for (unsigned i = 0; i != NumDecls; ++i) 4260 if (Decl *D = Group[i].getAs<Decl>()) 4261 Decls.push_back(D); 4262 4263 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 4264 Decls.data(), Decls.size())); 4265} 4266 4267 4268/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 4269/// to introduce parameters into function prototype scope. 4270Sema::DeclPtrTy 4271Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 4272 const DeclSpec &DS = D.getDeclSpec(); 4273 4274 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 4275 VarDecl::StorageClass StorageClass = VarDecl::None; 4276 VarDecl::StorageClass StorageClassAsWritten = VarDecl::None; 4277 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 4278 StorageClass = VarDecl::Register; 4279 StorageClassAsWritten = VarDecl::Register; 4280 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 4281 Diag(DS.getStorageClassSpecLoc(), 4282 diag::err_invalid_storage_class_in_func_decl); 4283 D.getMutableDeclSpec().ClearStorageClassSpecs(); 4284 } 4285 4286 if (D.getDeclSpec().isThreadSpecified()) 4287 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4288 4289 DiagnoseFunctionSpecifiers(D); 4290 4291 // Check that there are no default arguments inside the type of this 4292 // parameter (C++ only). 4293 if (getLangOptions().CPlusPlus) 4294 CheckExtraCXXDefaultArguments(D); 4295 4296 TagDecl *OwnedDecl = 0; 4297 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 4298 QualType parmDeclType = TInfo->getType(); 4299 4300 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 4301 // C++ [dcl.fct]p6: 4302 // Types shall not be defined in return or parameter types. 4303 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 4304 << Context.getTypeDeclType(OwnedDecl); 4305 } 4306 4307 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 4308 IdentifierInfo *II = D.getIdentifier(); 4309 if (II) { 4310 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 4311 ForRedeclaration); 4312 LookupName(R, S); 4313 if (R.isSingleResult()) { 4314 NamedDecl *PrevDecl = R.getFoundDecl(); 4315 if (PrevDecl->isTemplateParameter()) { 4316 // Maybe we will complain about the shadowed template parameter. 4317 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4318 // Just pretend that we didn't see the previous declaration. 4319 PrevDecl = 0; 4320 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 4321 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 4322 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4323 4324 // Recover by removing the name 4325 II = 0; 4326 D.SetIdentifier(0, D.getIdentifierLoc()); 4327 D.setInvalidType(true); 4328 } 4329 } 4330 } 4331 4332 // Temporarily put parameter variables in the translation unit, not 4333 // the enclosing context. This prevents them from accidentally 4334 // looking like class members in C++. 4335 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 4336 TInfo, parmDeclType, II, 4337 D.getIdentifierLoc(), 4338 StorageClass, StorageClassAsWritten); 4339 4340 if (D.isInvalidType()) 4341 New->setInvalidDecl(); 4342 4343 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 4344 if (D.getCXXScopeSpec().isSet()) { 4345 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 4346 << D.getCXXScopeSpec().getRange(); 4347 New->setInvalidDecl(); 4348 } 4349 4350 // Add the parameter declaration into this scope. 4351 S->AddDecl(DeclPtrTy::make(New)); 4352 if (II) 4353 IdResolver.AddDecl(New); 4354 4355 ProcessDeclAttributes(S, New, D); 4356 4357 if (New->hasAttr<BlocksAttr>()) { 4358 Diag(New->getLocation(), diag::err_block_on_nonlocal); 4359 } 4360 return DeclPtrTy::make(New); 4361} 4362 4363/// \brief Synthesizes a variable for a parameter arising from a 4364/// typedef. 4365ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 4366 SourceLocation Loc, 4367 QualType T) { 4368 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, 0, 4369 T, Context.getTrivialTypeSourceInfo(T, Loc), 4370 VarDecl::None, VarDecl::None, 0); 4371 Param->setImplicit(); 4372 return Param; 4373} 4374 4375ParmVarDecl *Sema::CheckParameter(DeclContext *DC, 4376 TypeSourceInfo *TSInfo, QualType T, 4377 IdentifierInfo *Name, 4378 SourceLocation NameLoc, 4379 VarDecl::StorageClass StorageClass, 4380 VarDecl::StorageClass StorageClassAsWritten) { 4381 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, NameLoc, Name, 4382 adjustParameterType(T), TSInfo, 4383 StorageClass, StorageClassAsWritten, 4384 0); 4385 4386 // Parameters can not be abstract class types. 4387 // For record types, this is done by the AbstractClassUsageDiagnoser once 4388 // the class has been completely parsed. 4389 if (!CurContext->isRecord() && 4390 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 4391 AbstractParamType)) 4392 New->setInvalidDecl(); 4393 4394 // Parameter declarators cannot be interface types. All ObjC objects are 4395 // passed by reference. 4396 if (T->isObjCObjectType()) { 4397 Diag(NameLoc, 4398 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 4399 New->setInvalidDecl(); 4400 } 4401 4402 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 4403 // duration shall not be qualified by an address-space qualifier." 4404 // Since all parameters have automatic store duration, they can not have 4405 // an address space. 4406 if (T.getAddressSpace() != 0) { 4407 Diag(NameLoc, diag::err_arg_with_address_space); 4408 New->setInvalidDecl(); 4409 } 4410 4411 return New; 4412} 4413 4414void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 4415 SourceLocation LocAfterDecls) { 4416 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4417 "Not a function declarator!"); 4418 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4419 4420 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 4421 // for a K&R function. 4422 if (!FTI.hasPrototype) { 4423 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 4424 --i; 4425 if (FTI.ArgInfo[i].Param == 0) { 4426 llvm::SmallString<256> Code; 4427 llvm::raw_svector_ostream(Code) << " int " 4428 << FTI.ArgInfo[i].Ident->getName() 4429 << ";\n"; 4430 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 4431 << FTI.ArgInfo[i].Ident 4432 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 4433 4434 // Implicitly declare the argument as type 'int' for lack of a better 4435 // type. 4436 DeclSpec DS; 4437 const char* PrevSpec; // unused 4438 unsigned DiagID; // unused 4439 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 4440 PrevSpec, DiagID); 4441 Declarator ParamD(DS, Declarator::KNRTypeListContext); 4442 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 4443 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 4444 } 4445 } 4446 } 4447} 4448 4449Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 4450 Declarator &D) { 4451 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 4452 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4453 "Not a function declarator!"); 4454 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4455 4456 if (FTI.hasPrototype) { 4457 // FIXME: Diagnose arguments without names in C. 4458 } 4459 4460 Scope *ParentScope = FnBodyScope->getParent(); 4461 4462 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 4463 MultiTemplateParamsArg(*this), 4464 /*IsFunctionDefinition=*/true); 4465 return ActOnStartOfFunctionDef(FnBodyScope, DP); 4466} 4467 4468static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 4469 // Don't warn about invalid declarations. 4470 if (FD->isInvalidDecl()) 4471 return false; 4472 4473 // Or declarations that aren't global. 4474 if (!FD->isGlobal()) 4475 return false; 4476 4477 // Don't warn about C++ member functions. 4478 if (isa<CXXMethodDecl>(FD)) 4479 return false; 4480 4481 // Don't warn about 'main'. 4482 if (FD->isMain()) 4483 return false; 4484 4485 // Don't warn about inline functions. 4486 if (FD->isInlineSpecified()) 4487 return false; 4488 4489 // Don't warn about function templates. 4490 if (FD->getDescribedFunctionTemplate()) 4491 return false; 4492 4493 // Don't warn about function template specializations. 4494 if (FD->isFunctionTemplateSpecialization()) 4495 return false; 4496 4497 bool MissingPrototype = true; 4498 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4499 Prev; Prev = Prev->getPreviousDeclaration()) { 4500 // Ignore any declarations that occur in function or method 4501 // scope, because they aren't visible from the header. 4502 if (Prev->getDeclContext()->isFunctionOrMethod()) 4503 continue; 4504 4505 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4506 break; 4507 } 4508 4509 return MissingPrototype; 4510} 4511 4512Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 4513 // Clear the last template instantiation error context. 4514 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4515 4516 if (!D) 4517 return D; 4518 FunctionDecl *FD = 0; 4519 4520 if (FunctionTemplateDecl *FunTmpl 4521 = dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>())) 4522 FD = FunTmpl->getTemplatedDecl(); 4523 else 4524 FD = cast<FunctionDecl>(D.getAs<Decl>()); 4525 4526 // Enter a new function scope 4527 PushFunctionScope(); 4528 4529 // See if this is a redefinition. 4530 // But don't complain if we're in GNU89 mode and the previous definition 4531 // was an extern inline function. 4532 const FunctionDecl *Definition; 4533 if (FD->getBody(Definition) && 4534 !canRedefineFunction(Definition, getLangOptions())) { 4535 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4536 Diag(Definition->getLocation(), diag::note_previous_definition); 4537 } 4538 4539 // Builtin functions cannot be defined. 4540 if (unsigned BuiltinID = FD->getBuiltinID()) { 4541 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4542 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4543 FD->setInvalidDecl(); 4544 } 4545 } 4546 4547 // The return type of a function definition must be complete 4548 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4549 QualType ResultType = FD->getResultType(); 4550 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4551 !FD->isInvalidDecl() && 4552 RequireCompleteType(FD->getLocation(), ResultType, 4553 diag::err_func_def_incomplete_result)) 4554 FD->setInvalidDecl(); 4555 4556 // GNU warning -Wmissing-prototypes: 4557 // Warn if a global function is defined without a previous 4558 // prototype declaration. This warning is issued even if the 4559 // definition itself provides a prototype. The aim is to detect 4560 // global functions that fail to be declared in header files. 4561 if (ShouldWarnAboutMissingPrototype(FD)) 4562 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4563 4564 if (FnBodyScope) 4565 PushDeclContext(FnBodyScope, FD); 4566 4567 // Check the validity of our function parameters 4568 CheckParmsForFunctionDef(FD); 4569 4570 bool ShouldCheckShadow = 4571 Diags.getDiagnosticLevel(diag::warn_decl_shadow) != Diagnostic::Ignored; 4572 4573 // Introduce our parameters into the function scope 4574 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4575 ParmVarDecl *Param = FD->getParamDecl(p); 4576 Param->setOwningFunction(FD); 4577 4578 // If this has an identifier, add it to the scope stack. 4579 if (Param->getIdentifier() && FnBodyScope) { 4580 if (ShouldCheckShadow) 4581 CheckShadow(FnBodyScope, Param); 4582 4583 PushOnScopeChains(Param, FnBodyScope); 4584 } 4585 } 4586 4587 // Checking attributes of current function definition 4588 // dllimport attribute. 4589 if (FD->getAttr<DLLImportAttr>() && 4590 (!FD->getAttr<DLLExportAttr>())) { 4591 // dllimport attribute cannot be applied to definition. 4592 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 4593 Diag(FD->getLocation(), 4594 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4595 << "dllimport"; 4596 FD->setInvalidDecl(); 4597 return DeclPtrTy::make(FD); 4598 } 4599 4600 // Visual C++ appears to not think this is an issue, so only issue 4601 // a warning when Microsoft extensions are disabled. 4602 if (!LangOpts.Microsoft) { 4603 // If a symbol previously declared dllimport is later defined, the 4604 // attribute is ignored in subsequent references, and a warning is 4605 // emitted. 4606 Diag(FD->getLocation(), 4607 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4608 << FD->getNameAsCString() << "dllimport"; 4609 } 4610 } 4611 return DeclPtrTy::make(FD); 4612} 4613 4614/// \brief Given the set of return statements within a function body, 4615/// compute the variables that are subject to the named return value 4616/// optimization. 4617/// 4618/// Each of the variables that is subject to the named return value 4619/// optimization will be marked as NRVO variables in the AST, and any 4620/// return statement that has a marked NRVO variable as its NRVO candidate can 4621/// use the named return value optimization. 4622/// 4623/// This function applies a very simplistic algorithm for NRVO: if every return 4624/// statement in the function has the same NRVO candidate, that candidate is 4625/// the NRVO variable. 4626/// 4627/// FIXME: Employ a smarter algorithm that accounts for multiple return 4628/// statements and the lifetimes of the NRVO candidates. We should be able to 4629/// find a maximal set of NRVO variables. 4630static void ComputeNRVO(Stmt *Body, ReturnStmt **Returns, unsigned NumReturns) { 4631 const VarDecl *NRVOCandidate = 0; 4632 for (unsigned I = 0; I != NumReturns; ++I) { 4633 if (!Returns[I]->getNRVOCandidate()) 4634 return; 4635 4636 if (!NRVOCandidate) 4637 NRVOCandidate = Returns[I]->getNRVOCandidate(); 4638 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 4639 return; 4640 } 4641 4642 if (NRVOCandidate) 4643 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 4644} 4645 4646Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 4647 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4648} 4649 4650Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 4651 bool IsInstantiation) { 4652 Decl *dcl = D.getAs<Decl>(); 4653 Stmt *Body = BodyArg.takeAs<Stmt>(); 4654 4655 FunctionDecl *FD = 0; 4656 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4657 if (FunTmpl) 4658 FD = FunTmpl->getTemplatedDecl(); 4659 else 4660 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4661 4662 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 4663 4664 if (FD) { 4665 FD->setBody(Body); 4666 if (FD->isMain()) { 4667 // C and C++ allow for main to automagically return 0. 4668 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 4669 FD->setHasImplicitReturnZero(true); 4670 WP.disableCheckFallThrough(); 4671 } 4672 4673 if (!FD->isInvalidDecl()) { 4674 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 4675 4676 // If this is a constructor, we need a vtable. 4677 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 4678 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 4679 4680 ComputeNRVO(Body, FunctionScopes.back()->Returns.data(), 4681 FunctionScopes.back()->Returns.size()); 4682 } 4683 4684 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 4685 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 4686 assert(MD == getCurMethodDecl() && "Method parsing confused"); 4687 MD->setBody(Body); 4688 MD->setEndLoc(Body->getLocEnd()); 4689 if (!MD->isInvalidDecl()) 4690 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 4691 } else { 4692 Body->Destroy(Context); 4693 return DeclPtrTy(); 4694 } 4695 4696 // Verify and clean out per-function state. 4697 4698 // Check goto/label use. 4699 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 4700 I = getLabelMap().begin(), E = getLabelMap().end(); I != E; ++I) { 4701 LabelStmt *L = I->second; 4702 4703 // Verify that we have no forward references left. If so, there was a goto 4704 // or address of a label taken, but no definition of it. Label fwd 4705 // definitions are indicated with a null substmt. 4706 if (L->getSubStmt() != 0) 4707 continue; 4708 4709 // Emit error. 4710 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 4711 4712 // At this point, we have gotos that use the bogus label. Stitch it into 4713 // the function body so that they aren't leaked and that the AST is well 4714 // formed. 4715 if (Body == 0) { 4716 // The whole function wasn't parsed correctly, just delete this. 4717 L->Destroy(Context); 4718 continue; 4719 } 4720 4721 // Otherwise, the body is valid: we want to stitch the label decl into the 4722 // function somewhere so that it is properly owned and so that the goto 4723 // has a valid target. Do this by creating a new compound stmt with the 4724 // label in it. 4725 4726 // Give the label a sub-statement. 4727 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 4728 4729 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 4730 cast<CXXTryStmt>(Body)->getTryBlock() : 4731 cast<CompoundStmt>(Body); 4732 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(), 4733 Compound->body_end()); 4734 Elements.push_back(L); 4735 Compound->setStmts(Context, Elements.data(), Elements.size()); 4736 } 4737 4738 if (Body) { 4739 // C++ constructors that have function-try-blocks can't have return 4740 // statements in the handlers of that block. (C++ [except.handle]p14) 4741 // Verify this. 4742 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 4743 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 4744 4745 // Verify that that gotos and switch cases don't jump into scopes illegally. 4746 // Verify that that gotos and switch cases don't jump into scopes illegally. 4747 if (FunctionNeedsScopeChecking() && 4748 !dcl->isInvalidDecl() && 4749 !hasAnyErrorsInThisFunction()) 4750 DiagnoseInvalidJumps(Body); 4751 4752 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 4753 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4754 Destructor->getParent()); 4755 4756 // If any errors have occurred, clear out any temporaries that may have 4757 // been leftover. This ensures that these temporaries won't be picked up for 4758 // deletion in some later function. 4759 if (PP.getDiagnostics().hasErrorOccurred()) 4760 ExprTemporaries.clear(); 4761 else if (!isa<FunctionTemplateDecl>(dcl)) { 4762 // Since the body is valid, issue any analysis-based warnings that are 4763 // enabled. 4764 QualType ResultType; 4765 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 4766 ResultType = FD->getResultType(); 4767 } 4768 else { 4769 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl); 4770 ResultType = MD->getResultType(); 4771 } 4772 AnalysisWarnings.IssueWarnings(WP, dcl); 4773 } 4774 4775 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 4776 } 4777 4778 if (!IsInstantiation) 4779 PopDeclContext(); 4780 4781 PopFunctionOrBlockScope(); 4782 4783 // If any errors have occurred, clear out any temporaries that may have 4784 // been leftover. This ensures that these temporaries won't be picked up for 4785 // deletion in some later function. 4786 if (getDiagnostics().hasErrorOccurred()) 4787 ExprTemporaries.clear(); 4788 4789 return D; 4790} 4791 4792/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 4793/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 4794NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 4795 IdentifierInfo &II, Scope *S) { 4796 // Before we produce a declaration for an implicitly defined 4797 // function, see whether there was a locally-scoped declaration of 4798 // this name as a function or variable. If so, use that 4799 // (non-visible) declaration, and complain about it. 4800 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4801 = LocallyScopedExternalDecls.find(&II); 4802 if (Pos != LocallyScopedExternalDecls.end()) { 4803 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 4804 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 4805 return Pos->second; 4806 } 4807 4808 // Extension in C99. Legal in C90, but warn about it. 4809 if (II.getName().startswith("__builtin_")) 4810 Diag(Loc, diag::warn_builtin_unknown) << &II; 4811 else if (getLangOptions().C99) 4812 Diag(Loc, diag::ext_implicit_function_decl) << &II; 4813 else 4814 Diag(Loc, diag::warn_implicit_function_decl) << &II; 4815 4816 // Set a Declarator for the implicit definition: int foo(); 4817 const char *Dummy; 4818 DeclSpec DS; 4819 unsigned DiagID; 4820 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 4821 Error = Error; // Silence warning. 4822 assert(!Error && "Error setting up implicit decl!"); 4823 Declarator D(DS, Declarator::BlockContext); 4824 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 4825 0, 0, false, SourceLocation(), 4826 false, 0,0,0, Loc, Loc, D), 4827 SourceLocation()); 4828 D.SetIdentifier(&II, Loc); 4829 4830 // Insert this function into translation-unit scope. 4831 4832 DeclContext *PrevDC = CurContext; 4833 CurContext = Context.getTranslationUnitDecl(); 4834 4835 FunctionDecl *FD = 4836 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 4837 FD->setImplicit(); 4838 4839 CurContext = PrevDC; 4840 4841 AddKnownFunctionAttributes(FD); 4842 4843 return FD; 4844} 4845 4846/// \brief Adds any function attributes that we know a priori based on 4847/// the declaration of this function. 4848/// 4849/// These attributes can apply both to implicitly-declared builtins 4850/// (like __builtin___printf_chk) or to library-declared functions 4851/// like NSLog or printf. 4852void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 4853 if (FD->isInvalidDecl()) 4854 return; 4855 4856 // If this is a built-in function, map its builtin attributes to 4857 // actual attributes. 4858 if (unsigned BuiltinID = FD->getBuiltinID()) { 4859 // Handle printf-formatting attributes. 4860 unsigned FormatIdx; 4861 bool HasVAListArg; 4862 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 4863 if (!FD->getAttr<FormatAttr>()) 4864 FD->addAttr(::new (Context) FormatAttr(Context, "printf", FormatIdx+1, 4865 HasVAListArg ? 0 : FormatIdx+2)); 4866 } 4867 4868 // Mark const if we don't care about errno and that is the only 4869 // thing preventing the function from being const. This allows 4870 // IRgen to use LLVM intrinsics for such functions. 4871 if (!getLangOptions().MathErrno && 4872 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 4873 if (!FD->getAttr<ConstAttr>()) 4874 FD->addAttr(::new (Context) ConstAttr()); 4875 } 4876 4877 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 4878 FD->setType(Context.getNoReturnType(FD->getType())); 4879 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 4880 FD->addAttr(::new (Context) NoThrowAttr()); 4881 if (Context.BuiltinInfo.isConst(BuiltinID)) 4882 FD->addAttr(::new (Context) ConstAttr()); 4883 } 4884 4885 IdentifierInfo *Name = FD->getIdentifier(); 4886 if (!Name) 4887 return; 4888 if ((!getLangOptions().CPlusPlus && 4889 FD->getDeclContext()->isTranslationUnit()) || 4890 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 4891 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 4892 LinkageSpecDecl::lang_c)) { 4893 // Okay: this could be a libc/libm/Objective-C function we know 4894 // about. 4895 } else 4896 return; 4897 4898 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 4899 // FIXME: NSLog and NSLogv should be target specific 4900 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 4901 // FIXME: We known better than our headers. 4902 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 4903 } else 4904 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 1, 4905 Name->isStr("NSLogv") ? 0 : 2)); 4906 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 4907 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 4908 // target-specific builtins, perhaps? 4909 if (!FD->getAttr<FormatAttr>()) 4910 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 2, 4911 Name->isStr("vasprintf") ? 0 : 3)); 4912 } 4913} 4914 4915TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 4916 TypeSourceInfo *TInfo) { 4917 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 4918 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 4919 4920 if (!TInfo) { 4921 assert(D.isInvalidType() && "no declarator info for valid type"); 4922 TInfo = Context.getTrivialTypeSourceInfo(T); 4923 } 4924 4925 // Scope manipulation handled by caller. 4926 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 4927 D.getIdentifierLoc(), 4928 D.getIdentifier(), 4929 TInfo); 4930 4931 if (const TagType *TT = T->getAs<TagType>()) { 4932 TagDecl *TD = TT->getDecl(); 4933 4934 // If the TagDecl that the TypedefDecl points to is an anonymous decl 4935 // keep track of the TypedefDecl. 4936 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 4937 TD->setTypedefForAnonDecl(NewTD); 4938 } 4939 4940 if (D.isInvalidType()) 4941 NewTD->setInvalidDecl(); 4942 return NewTD; 4943} 4944 4945 4946/// \brief Determine whether a tag with a given kind is acceptable 4947/// as a redeclaration of the given tag declaration. 4948/// 4949/// \returns true if the new tag kind is acceptable, false otherwise. 4950bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 4951 TagTypeKind NewTag, 4952 SourceLocation NewTagLoc, 4953 const IdentifierInfo &Name) { 4954 // C++ [dcl.type.elab]p3: 4955 // The class-key or enum keyword present in the 4956 // elaborated-type-specifier shall agree in kind with the 4957 // declaration to which the name in the elaborated-type-specifier 4958 // refers. This rule also applies to the form of 4959 // elaborated-type-specifier that declares a class-name or 4960 // friend class since it can be construed as referring to the 4961 // definition of the class. Thus, in any 4962 // elaborated-type-specifier, the enum keyword shall be used to 4963 // refer to an enumeration (7.2), the union class-key shall be 4964 // used to refer to a union (clause 9), and either the class or 4965 // struct class-key shall be used to refer to a class (clause 9) 4966 // declared using the class or struct class-key. 4967 TagTypeKind OldTag = Previous->getTagKind(); 4968 if (OldTag == NewTag) 4969 return true; 4970 4971 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 4972 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 4973 // Warn about the struct/class tag mismatch. 4974 bool isTemplate = false; 4975 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 4976 isTemplate = Record->getDescribedClassTemplate(); 4977 4978 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 4979 << (NewTag == TTK_Class) 4980 << isTemplate << &Name 4981 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 4982 OldTag == TTK_Class? "class" : "struct"); 4983 Diag(Previous->getLocation(), diag::note_previous_use); 4984 return true; 4985 } 4986 return false; 4987} 4988 4989/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 4990/// former case, Name will be non-null. In the later case, Name will be null. 4991/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 4992/// reference/declaration/definition of a tag. 4993Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 4994 SourceLocation KWLoc, CXXScopeSpec &SS, 4995 IdentifierInfo *Name, SourceLocation NameLoc, 4996 AttributeList *Attr, AccessSpecifier AS, 4997 MultiTemplateParamsArg TemplateParameterLists, 4998 bool &OwnedDecl, bool &IsDependent) { 4999 // If this is not a definition, it must have a name. 5000 assert((Name != 0 || TUK == TUK_Definition) && 5001 "Nameless record must be a definition!"); 5002 5003 OwnedDecl = false; 5004 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 5005 5006 // FIXME: Check explicit specializations more carefully. 5007 bool isExplicitSpecialization = false; 5008 unsigned NumMatchedTemplateParamLists = TemplateParameterLists.size(); 5009 if (TUK != TUK_Reference) { 5010 if (TemplateParameterList *TemplateParams 5011 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 5012 (TemplateParameterList**)TemplateParameterLists.get(), 5013 TemplateParameterLists.size(), 5014 TUK == TUK_Friend, 5015 isExplicitSpecialization)) { 5016 // All but one template parameter lists have been matching. 5017 --NumMatchedTemplateParamLists; 5018 5019 if (TemplateParams->size() > 0) { 5020 // This is a declaration or definition of a class template (which may 5021 // be a member of another template). 5022 OwnedDecl = false; 5023 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 5024 SS, Name, NameLoc, Attr, 5025 TemplateParams, 5026 AS); 5027 TemplateParameterLists.release(); 5028 return Result.get(); 5029 } else { 5030 // The "template<>" header is extraneous. 5031 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 5032 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 5033 isExplicitSpecialization = true; 5034 } 5035 } 5036 } 5037 5038 DeclContext *SearchDC = CurContext; 5039 DeclContext *DC = CurContext; 5040 bool isStdBadAlloc = false; 5041 bool Invalid = false; 5042 5043 RedeclarationKind Redecl = ForRedeclaration; 5044 if (TUK == TUK_Friend || TUK == TUK_Reference) 5045 Redecl = NotForRedeclaration; 5046 5047 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 5048 5049 if (Name && SS.isNotEmpty()) { 5050 // We have a nested-name tag ('struct foo::bar'). 5051 5052 // Check for invalid 'foo::'. 5053 if (SS.isInvalid()) { 5054 Name = 0; 5055 goto CreateNewDecl; 5056 } 5057 5058 // If this is a friend or a reference to a class in a dependent 5059 // context, don't try to make a decl for it. 5060 if (TUK == TUK_Friend || TUK == TUK_Reference) { 5061 DC = computeDeclContext(SS, false); 5062 if (!DC) { 5063 IsDependent = true; 5064 return DeclPtrTy(); 5065 } 5066 } else { 5067 DC = computeDeclContext(SS, true); 5068 if (!DC) { 5069 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 5070 << SS.getRange(); 5071 return DeclPtrTy(); 5072 } 5073 } 5074 5075 if (RequireCompleteDeclContext(SS, DC)) 5076 return DeclPtrTy::make((Decl *)0); 5077 5078 SearchDC = DC; 5079 // Look-up name inside 'foo::'. 5080 LookupQualifiedName(Previous, DC); 5081 5082 if (Previous.isAmbiguous()) 5083 return DeclPtrTy(); 5084 5085 if (Previous.empty()) { 5086 // Name lookup did not find anything. However, if the 5087 // nested-name-specifier refers to the current instantiation, 5088 // and that current instantiation has any dependent base 5089 // classes, we might find something at instantiation time: treat 5090 // this as a dependent elaborated-type-specifier. 5091 if (Previous.wasNotFoundInCurrentInstantiation()) { 5092 IsDependent = true; 5093 return DeclPtrTy(); 5094 } 5095 5096 // A tag 'foo::bar' must already exist. 5097 Diag(NameLoc, diag::err_not_tag_in_scope) 5098 << Kind << Name << DC << SS.getRange(); 5099 Name = 0; 5100 Invalid = true; 5101 goto CreateNewDecl; 5102 } 5103 } else if (Name) { 5104 // If this is a named struct, check to see if there was a previous forward 5105 // declaration or definition. 5106 // FIXME: We're looking into outer scopes here, even when we 5107 // shouldn't be. Doing so can result in ambiguities that we 5108 // shouldn't be diagnosing. 5109 LookupName(Previous, S); 5110 5111 // Note: there used to be some attempt at recovery here. 5112 if (Previous.isAmbiguous()) 5113 return DeclPtrTy(); 5114 5115 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 5116 // FIXME: This makes sure that we ignore the contexts associated 5117 // with C structs, unions, and enums when looking for a matching 5118 // tag declaration or definition. See the similar lookup tweak 5119 // in Sema::LookupName; is there a better way to deal with this? 5120 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 5121 SearchDC = SearchDC->getParent(); 5122 } 5123 } 5124 5125 if (Previous.isSingleResult() && 5126 Previous.getFoundDecl()->isTemplateParameter()) { 5127 // Maybe we will complain about the shadowed template parameter. 5128 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 5129 // Just pretend that we didn't see the previous declaration. 5130 Previous.clear(); 5131 } 5132 5133 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 5134 DC->Equals(StdNamespace) && Name->isStr("bad_alloc")) { 5135 // This is a declaration of or a reference to "std::bad_alloc". 5136 isStdBadAlloc = true; 5137 5138 if (Previous.empty() && StdBadAlloc) { 5139 // std::bad_alloc has been implicitly declared (but made invisible to 5140 // name lookup). Fill in this implicit declaration as the previous 5141 // declaration, so that the declarations get chained appropriately. 5142 Previous.addDecl(StdBadAlloc); 5143 } 5144 } 5145 5146 // If we didn't find a previous declaration, and this is a reference 5147 // (or friend reference), move to the correct scope. In C++, we 5148 // also need to do a redeclaration lookup there, just in case 5149 // there's a shadow friend decl. 5150 if (Name && Previous.empty() && 5151 (TUK == TUK_Reference || TUK == TUK_Friend)) { 5152 if (Invalid) goto CreateNewDecl; 5153 assert(SS.isEmpty()); 5154 5155 if (TUK == TUK_Reference) { 5156 // C++ [basic.scope.pdecl]p5: 5157 // -- for an elaborated-type-specifier of the form 5158 // 5159 // class-key identifier 5160 // 5161 // if the elaborated-type-specifier is used in the 5162 // decl-specifier-seq or parameter-declaration-clause of a 5163 // function defined in namespace scope, the identifier is 5164 // declared as a class-name in the namespace that contains 5165 // the declaration; otherwise, except as a friend 5166 // declaration, the identifier is declared in the smallest 5167 // non-class, non-function-prototype scope that contains the 5168 // declaration. 5169 // 5170 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 5171 // C structs and unions. 5172 // 5173 // It is an error in C++ to declare (rather than define) an enum 5174 // type, including via an elaborated type specifier. We'll 5175 // diagnose that later; for now, declare the enum in the same 5176 // scope as we would have picked for any other tag type. 5177 // 5178 // GNU C also supports this behavior as part of its incomplete 5179 // enum types extension, while GNU C++ does not. 5180 // 5181 // Find the context where we'll be declaring the tag. 5182 // FIXME: We would like to maintain the current DeclContext as the 5183 // lexical context, 5184 while (SearchDC->isRecord()) 5185 SearchDC = SearchDC->getParent(); 5186 5187 // Find the scope where we'll be declaring the tag. 5188 while (S->isClassScope() || 5189 (getLangOptions().CPlusPlus && 5190 S->isFunctionPrototypeScope()) || 5191 ((S->getFlags() & Scope::DeclScope) == 0) || 5192 (S->getEntity() && 5193 ((DeclContext *)S->getEntity())->isTransparentContext())) 5194 S = S->getParent(); 5195 } else { 5196 assert(TUK == TUK_Friend); 5197 // C++ [namespace.memdef]p3: 5198 // If a friend declaration in a non-local class first declares a 5199 // class or function, the friend class or function is a member of 5200 // the innermost enclosing namespace. 5201 SearchDC = SearchDC->getEnclosingNamespaceContext(); 5202 } 5203 5204 // In C++, we need to do a redeclaration lookup to properly 5205 // diagnose some problems. 5206 if (getLangOptions().CPlusPlus) { 5207 Previous.setRedeclarationKind(ForRedeclaration); 5208 LookupQualifiedName(Previous, SearchDC); 5209 } 5210 } 5211 5212 if (!Previous.empty()) { 5213 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 5214 5215 // It's okay to have a tag decl in the same scope as a typedef 5216 // which hides a tag decl in the same scope. Finding this 5217 // insanity with a redeclaration lookup can only actually happen 5218 // in C++. 5219 // 5220 // This is also okay for elaborated-type-specifiers, which is 5221 // technically forbidden by the current standard but which is 5222 // okay according to the likely resolution of an open issue; 5223 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 5224 if (getLangOptions().CPlusPlus) { 5225 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(PrevDecl)) { 5226 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 5227 TagDecl *Tag = TT->getDecl(); 5228 if (Tag->getDeclName() == Name && 5229 Tag->getDeclContext()->getLookupContext() 5230 ->Equals(TD->getDeclContext()->getLookupContext())) { 5231 PrevDecl = Tag; 5232 Previous.clear(); 5233 Previous.addDecl(Tag); 5234 } 5235 } 5236 } 5237 } 5238 5239 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 5240 // If this is a use of a previous tag, or if the tag is already declared 5241 // in the same scope (so that the definition/declaration completes or 5242 // rementions the tag), reuse the decl. 5243 if (TUK == TUK_Reference || TUK == TUK_Friend || 5244 isDeclInScope(PrevDecl, SearchDC, S)) { 5245 // Make sure that this wasn't declared as an enum and now used as a 5246 // struct or something similar. 5247 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 5248 bool SafeToContinue 5249 = (PrevTagDecl->getTagKind() != TTK_Enum && 5250 Kind != TTK_Enum); 5251 if (SafeToContinue) 5252 Diag(KWLoc, diag::err_use_with_wrong_tag) 5253 << Name 5254 << FixItHint::CreateReplacement(SourceRange(KWLoc), 5255 PrevTagDecl->getKindName()); 5256 else 5257 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 5258 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 5259 5260 if (SafeToContinue) 5261 Kind = PrevTagDecl->getTagKind(); 5262 else { 5263 // Recover by making this an anonymous redefinition. 5264 Name = 0; 5265 Previous.clear(); 5266 Invalid = true; 5267 } 5268 } 5269 5270 if (!Invalid) { 5271 // If this is a use, just return the declaration we found. 5272 5273 // FIXME: In the future, return a variant or some other clue 5274 // for the consumer of this Decl to know it doesn't own it. 5275 // For our current ASTs this shouldn't be a problem, but will 5276 // need to be changed with DeclGroups. 5277 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) || 5278 TUK == TUK_Friend) 5279 return DeclPtrTy::make(PrevTagDecl); 5280 5281 // Diagnose attempts to redefine a tag. 5282 if (TUK == TUK_Definition) { 5283 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 5284 // If we're defining a specialization and the previous definition 5285 // is from an implicit instantiation, don't emit an error 5286 // here; we'll catch this in the general case below. 5287 if (!isExplicitSpecialization || 5288 !isa<CXXRecordDecl>(Def) || 5289 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 5290 == TSK_ExplicitSpecialization) { 5291 Diag(NameLoc, diag::err_redefinition) << Name; 5292 Diag(Def->getLocation(), diag::note_previous_definition); 5293 // If this is a redefinition, recover by making this 5294 // struct be anonymous, which will make any later 5295 // references get the previous definition. 5296 Name = 0; 5297 Previous.clear(); 5298 Invalid = true; 5299 } 5300 } else { 5301 // If the type is currently being defined, complain 5302 // about a nested redefinition. 5303 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 5304 if (Tag->isBeingDefined()) { 5305 Diag(NameLoc, diag::err_nested_redefinition) << Name; 5306 Diag(PrevTagDecl->getLocation(), 5307 diag::note_previous_definition); 5308 Name = 0; 5309 Previous.clear(); 5310 Invalid = true; 5311 } 5312 } 5313 5314 // Okay, this is definition of a previously declared or referenced 5315 // tag PrevDecl. We're going to create a new Decl for it. 5316 } 5317 } 5318 // If we get here we have (another) forward declaration or we 5319 // have a definition. Just create a new decl. 5320 5321 } else { 5322 // If we get here, this is a definition of a new tag type in a nested 5323 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 5324 // new decl/type. We set PrevDecl to NULL so that the entities 5325 // have distinct types. 5326 Previous.clear(); 5327 } 5328 // If we get here, we're going to create a new Decl. If PrevDecl 5329 // is non-NULL, it's a definition of the tag declared by 5330 // PrevDecl. If it's NULL, we have a new definition. 5331 5332 5333 // Otherwise, PrevDecl is not a tag, but was found with tag 5334 // lookup. This is only actually possible in C++, where a few 5335 // things like templates still live in the tag namespace. 5336 } else { 5337 assert(getLangOptions().CPlusPlus); 5338 5339 // Use a better diagnostic if an elaborated-type-specifier 5340 // found the wrong kind of type on the first 5341 // (non-redeclaration) lookup. 5342 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 5343 !Previous.isForRedeclaration()) { 5344 unsigned Kind = 0; 5345 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5346 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5347 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 5348 Diag(PrevDecl->getLocation(), diag::note_declared_at); 5349 Invalid = true; 5350 5351 // Otherwise, only diagnose if the declaration is in scope. 5352 } else if (!isDeclInScope(PrevDecl, SearchDC, S)) { 5353 // do nothing 5354 5355 // Diagnose implicit declarations introduced by elaborated types. 5356 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 5357 unsigned Kind = 0; 5358 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5359 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5360 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 5361 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5362 Invalid = true; 5363 5364 // Otherwise it's a declaration. Call out a particularly common 5365 // case here. 5366 } else if (isa<TypedefDecl>(PrevDecl)) { 5367 Diag(NameLoc, diag::err_tag_definition_of_typedef) 5368 << Name 5369 << cast<TypedefDecl>(PrevDecl)->getUnderlyingType(); 5370 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5371 Invalid = true; 5372 5373 // Otherwise, diagnose. 5374 } else { 5375 // The tag name clashes with something else in the target scope, 5376 // issue an error and recover by making this tag be anonymous. 5377 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 5378 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5379 Name = 0; 5380 Invalid = true; 5381 } 5382 5383 // The existing declaration isn't relevant to us; we're in a 5384 // new scope, so clear out the previous declaration. 5385 Previous.clear(); 5386 } 5387 } 5388 5389CreateNewDecl: 5390 5391 TagDecl *PrevDecl = 0; 5392 if (Previous.isSingleResult()) 5393 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 5394 5395 // If there is an identifier, use the location of the identifier as the 5396 // location of the decl, otherwise use the location of the struct/union 5397 // keyword. 5398 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 5399 5400 // Otherwise, create a new declaration. If there is a previous 5401 // declaration of the same entity, the two will be linked via 5402 // PrevDecl. 5403 TagDecl *New; 5404 5405 if (Kind == TTK_Enum) { 5406 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5407 // enum X { A, B, C } D; D should chain to X. 5408 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 5409 cast_or_null<EnumDecl>(PrevDecl)); 5410 // If this is an undefined enum, warn. 5411 if (TUK != TUK_Definition && !Invalid) { 5412 TagDecl *Def; 5413 if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 5414 Diag(Loc, diag::ext_forward_ref_enum_def) 5415 << New; 5416 Diag(Def->getLocation(), diag::note_previous_definition); 5417 } else { 5418 Diag(Loc, 5419 getLangOptions().CPlusPlus? diag::err_forward_ref_enum 5420 : diag::ext_forward_ref_enum); 5421 } 5422 } 5423 } else { 5424 // struct/union/class 5425 5426 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5427 // struct X { int A; } D; D should chain to X. 5428 if (getLangOptions().CPlusPlus) { 5429 // FIXME: Look for a way to use RecordDecl for simple structs. 5430 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5431 cast_or_null<CXXRecordDecl>(PrevDecl)); 5432 5433 if (isStdBadAlloc && (!StdBadAlloc || StdBadAlloc->isImplicit())) 5434 StdBadAlloc = cast<CXXRecordDecl>(New); 5435 } else 5436 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5437 cast_or_null<RecordDecl>(PrevDecl)); 5438 } 5439 5440 // Maybe add qualifier info. 5441 if (SS.isNotEmpty()) { 5442 if (SS.isSet()) { 5443 NestedNameSpecifier *NNS 5444 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5445 New->setQualifierInfo(NNS, SS.getRange()); 5446 if (NumMatchedTemplateParamLists > 0) { 5447 New->setTemplateParameterListsInfo(Context, 5448 NumMatchedTemplateParamLists, 5449 (TemplateParameterList**) TemplateParameterLists.release()); 5450 } 5451 } 5452 else 5453 Invalid = true; 5454 } 5455 5456 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 5457 // Add alignment attributes if necessary; these attributes are checked when 5458 // the ASTContext lays out the structure. 5459 // 5460 // It is important for implementing the correct semantics that this 5461 // happen here (in act on tag decl). The #pragma pack stack is 5462 // maintained as a result of parser callbacks which can occur at 5463 // many points during the parsing of a struct declaration (because 5464 // the #pragma tokens are effectively skipped over during the 5465 // parsing of the struct). 5466 AddAlignmentAttributesForRecord(RD); 5467 } 5468 5469 // If this is a specialization of a member class (of a class template), 5470 // check the specialization. 5471 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 5472 Invalid = true; 5473 5474 if (Invalid) 5475 New->setInvalidDecl(); 5476 5477 if (Attr) 5478 ProcessDeclAttributeList(S, New, Attr); 5479 5480 // If we're declaring or defining a tag in function prototype scope 5481 // in C, note that this type can only be used within the function. 5482 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 5483 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 5484 5485 // Set the lexical context. If the tag has a C++ scope specifier, the 5486 // lexical context will be different from the semantic context. 5487 New->setLexicalDeclContext(CurContext); 5488 5489 // Mark this as a friend decl if applicable. 5490 if (TUK == TUK_Friend) 5491 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 5492 5493 // Set the access specifier. 5494 if (!Invalid && SearchDC->isRecord()) 5495 SetMemberAccessSpecifier(New, PrevDecl, AS); 5496 5497 if (TUK == TUK_Definition) 5498 New->startDefinition(); 5499 5500 // If this has an identifier, add it to the scope stack. 5501 if (TUK == TUK_Friend) { 5502 // We might be replacing an existing declaration in the lookup tables; 5503 // if so, borrow its access specifier. 5504 if (PrevDecl) 5505 New->setAccess(PrevDecl->getAccess()); 5506 5507 DeclContext *DC = New->getDeclContext()->getLookupContext(); 5508 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 5509 if (Name) // can be null along some error paths 5510 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5511 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 5512 } else if (Name) { 5513 S = getNonFieldDeclScope(S); 5514 PushOnScopeChains(New, S); 5515 } else { 5516 CurContext->addDecl(New); 5517 } 5518 5519 // If this is the C FILE type, notify the AST context. 5520 if (IdentifierInfo *II = New->getIdentifier()) 5521 if (!New->isInvalidDecl() && 5522 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 5523 II->isStr("FILE")) 5524 Context.setFILEDecl(New); 5525 5526 OwnedDecl = true; 5527 return DeclPtrTy::make(New); 5528} 5529 5530void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 5531 AdjustDeclIfTemplate(TagD); 5532 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5533 5534 // Enter the tag context. 5535 PushDeclContext(S, Tag); 5536} 5537 5538void Sema::ActOnStartCXXMemberDeclarations(Scope *S, DeclPtrTy TagD, 5539 SourceLocation LBraceLoc) { 5540 AdjustDeclIfTemplate(TagD); 5541 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD.getAs<Decl>()); 5542 5543 FieldCollector->StartClass(); 5544 5545 if (!Record->getIdentifier()) 5546 return; 5547 5548 // C++ [class]p2: 5549 // [...] The class-name is also inserted into the scope of the 5550 // class itself; this is known as the injected-class-name. For 5551 // purposes of access checking, the injected-class-name is treated 5552 // as if it were a public member name. 5553 CXXRecordDecl *InjectedClassName 5554 = CXXRecordDecl::Create(Context, Record->getTagKind(), 5555 CurContext, Record->getLocation(), 5556 Record->getIdentifier(), 5557 Record->getTagKeywordLoc(), 5558 Record); 5559 InjectedClassName->setImplicit(); 5560 InjectedClassName->setAccess(AS_public); 5561 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 5562 InjectedClassName->setDescribedClassTemplate(Template); 5563 PushOnScopeChains(InjectedClassName, S); 5564 assert(InjectedClassName->isInjectedClassName() && 5565 "Broken injected-class-name"); 5566} 5567 5568void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 5569 SourceLocation RBraceLoc) { 5570 AdjustDeclIfTemplate(TagD); 5571 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5572 Tag->setRBraceLoc(RBraceLoc); 5573 5574 if (isa<CXXRecordDecl>(Tag)) 5575 FieldCollector->FinishClass(); 5576 5577 // Exit this scope of this tag's definition. 5578 PopDeclContext(); 5579 5580 // Notify the consumer that we've defined a tag. 5581 Consumer.HandleTagDeclDefinition(Tag); 5582} 5583 5584void Sema::ActOnTagDefinitionError(Scope *S, DeclPtrTy TagD) { 5585 AdjustDeclIfTemplate(TagD); 5586 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5587 Tag->setInvalidDecl(); 5588 5589 // We're undoing ActOnTagStartDefinition here, not 5590 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 5591 // the FieldCollector. 5592 5593 PopDeclContext(); 5594} 5595 5596// Note that FieldName may be null for anonymous bitfields. 5597bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 5598 QualType FieldTy, const Expr *BitWidth, 5599 bool *ZeroWidth) { 5600 // Default to true; that shouldn't confuse checks for emptiness 5601 if (ZeroWidth) 5602 *ZeroWidth = true; 5603 5604 // C99 6.7.2.1p4 - verify the field type. 5605 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 5606 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 5607 // Handle incomplete types with specific error. 5608 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 5609 return true; 5610 if (FieldName) 5611 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 5612 << FieldName << FieldTy << BitWidth->getSourceRange(); 5613 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 5614 << FieldTy << BitWidth->getSourceRange(); 5615 } 5616 5617 // If the bit-width is type- or value-dependent, don't try to check 5618 // it now. 5619 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 5620 return false; 5621 5622 llvm::APSInt Value; 5623 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 5624 return true; 5625 5626 if (Value != 0 && ZeroWidth) 5627 *ZeroWidth = false; 5628 5629 // Zero-width bitfield is ok for anonymous field. 5630 if (Value == 0 && FieldName) 5631 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 5632 5633 if (Value.isSigned() && Value.isNegative()) { 5634 if (FieldName) 5635 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 5636 << FieldName << Value.toString(10); 5637 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 5638 << Value.toString(10); 5639 } 5640 5641 if (!FieldTy->isDependentType()) { 5642 uint64_t TypeSize = Context.getTypeSize(FieldTy); 5643 if (Value.getZExtValue() > TypeSize) { 5644 if (!getLangOptions().CPlusPlus) { 5645 if (FieldName) 5646 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 5647 << FieldName << (unsigned)Value.getZExtValue() 5648 << (unsigned)TypeSize; 5649 5650 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 5651 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 5652 } 5653 5654 if (FieldName) 5655 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 5656 << FieldName << (unsigned)Value.getZExtValue() 5657 << (unsigned)TypeSize; 5658 else 5659 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 5660 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 5661 } 5662 } 5663 5664 return false; 5665} 5666 5667/// ActOnField - Each field of a struct/union/class is passed into this in order 5668/// to create a FieldDecl object for it. 5669Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 5670 SourceLocation DeclStart, 5671 Declarator &D, ExprTy *BitfieldWidth) { 5672 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 5673 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 5674 AS_public); 5675 return DeclPtrTy::make(Res); 5676} 5677 5678/// HandleField - Analyze a field of a C struct or a C++ data member. 5679/// 5680FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 5681 SourceLocation DeclStart, 5682 Declarator &D, Expr *BitWidth, 5683 AccessSpecifier AS) { 5684 IdentifierInfo *II = D.getIdentifier(); 5685 SourceLocation Loc = DeclStart; 5686 if (II) Loc = D.getIdentifierLoc(); 5687 5688 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 5689 QualType T = TInfo->getType(); 5690 if (getLangOptions().CPlusPlus) 5691 CheckExtraCXXDefaultArguments(D); 5692 5693 DiagnoseFunctionSpecifiers(D); 5694 5695 if (D.getDeclSpec().isThreadSpecified()) 5696 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5697 5698 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 5699 ForRedeclaration); 5700 5701 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5702 // Maybe we will complain about the shadowed template parameter. 5703 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5704 // Just pretend that we didn't see the previous declaration. 5705 PrevDecl = 0; 5706 } 5707 5708 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 5709 PrevDecl = 0; 5710 5711 bool Mutable 5712 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 5713 SourceLocation TSSL = D.getSourceRange().getBegin(); 5714 FieldDecl *NewFD 5715 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 5716 AS, PrevDecl, &D); 5717 5718 if (NewFD->isInvalidDecl()) 5719 Record->setInvalidDecl(); 5720 5721 if (NewFD->isInvalidDecl() && PrevDecl) { 5722 // Don't introduce NewFD into scope; there's already something 5723 // with the same name in the same scope. 5724 } else if (II) { 5725 PushOnScopeChains(NewFD, S); 5726 } else 5727 Record->addDecl(NewFD); 5728 5729 return NewFD; 5730} 5731 5732/// \brief Build a new FieldDecl and check its well-formedness. 5733/// 5734/// This routine builds a new FieldDecl given the fields name, type, 5735/// record, etc. \p PrevDecl should refer to any previous declaration 5736/// with the same name and in the same scope as the field to be 5737/// created. 5738/// 5739/// \returns a new FieldDecl. 5740/// 5741/// \todo The Declarator argument is a hack. It will be removed once 5742FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 5743 TypeSourceInfo *TInfo, 5744 RecordDecl *Record, SourceLocation Loc, 5745 bool Mutable, Expr *BitWidth, 5746 SourceLocation TSSL, 5747 AccessSpecifier AS, NamedDecl *PrevDecl, 5748 Declarator *D) { 5749 IdentifierInfo *II = Name.getAsIdentifierInfo(); 5750 bool InvalidDecl = false; 5751 if (D) InvalidDecl = D->isInvalidType(); 5752 5753 // If we receive a broken type, recover by assuming 'int' and 5754 // marking this declaration as invalid. 5755 if (T.isNull()) { 5756 InvalidDecl = true; 5757 T = Context.IntTy; 5758 } 5759 5760 QualType EltTy = Context.getBaseElementType(T); 5761 if (!EltTy->isDependentType() && 5762 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) 5763 InvalidDecl = true; 5764 5765 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5766 // than a variably modified type. 5767 if (!InvalidDecl && T->isVariablyModifiedType()) { 5768 bool SizeIsNegative; 5769 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 5770 SizeIsNegative); 5771 if (!FixedTy.isNull()) { 5772 Diag(Loc, diag::warn_illegal_constant_array_size); 5773 T = FixedTy; 5774 } else { 5775 if (SizeIsNegative) 5776 Diag(Loc, diag::err_typecheck_negative_array_size); 5777 else 5778 Diag(Loc, diag::err_typecheck_field_variable_size); 5779 InvalidDecl = true; 5780 } 5781 } 5782 5783 // Fields can not have abstract class types 5784 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 5785 diag::err_abstract_type_in_decl, 5786 AbstractFieldType)) 5787 InvalidDecl = true; 5788 5789 bool ZeroWidth = false; 5790 // If this is declared as a bit-field, check the bit-field. 5791 if (!InvalidDecl && BitWidth && 5792 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 5793 InvalidDecl = true; 5794 DeleteExpr(BitWidth); 5795 BitWidth = 0; 5796 ZeroWidth = false; 5797 } 5798 5799 // Check that 'mutable' is consistent with the type of the declaration. 5800 if (!InvalidDecl && Mutable) { 5801 unsigned DiagID = 0; 5802 if (T->isReferenceType()) 5803 DiagID = diag::err_mutable_reference; 5804 else if (T.isConstQualified()) 5805 DiagID = diag::err_mutable_const; 5806 5807 if (DiagID) { 5808 SourceLocation ErrLoc = Loc; 5809 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 5810 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 5811 Diag(ErrLoc, DiagID); 5812 Mutable = false; 5813 InvalidDecl = true; 5814 } 5815 } 5816 5817 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 5818 BitWidth, Mutable); 5819 if (InvalidDecl) 5820 NewFD->setInvalidDecl(); 5821 5822 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 5823 Diag(Loc, diag::err_duplicate_member) << II; 5824 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5825 NewFD->setInvalidDecl(); 5826 } 5827 5828 if (!InvalidDecl && getLangOptions().CPlusPlus) { 5829 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 5830 5831 if (!T->isPODType()) 5832 CXXRecord->setPOD(false); 5833 if (!ZeroWidth) 5834 CXXRecord->setEmpty(false); 5835 5836 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 5837 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 5838 if (RDecl->getDefinition()) { 5839 if (!RDecl->hasTrivialConstructor()) 5840 CXXRecord->setHasTrivialConstructor(false); 5841 if (!RDecl->hasTrivialCopyConstructor()) 5842 CXXRecord->setHasTrivialCopyConstructor(false); 5843 if (!RDecl->hasTrivialCopyAssignment()) 5844 CXXRecord->setHasTrivialCopyAssignment(false); 5845 if (!RDecl->hasTrivialDestructor()) 5846 CXXRecord->setHasTrivialDestructor(false); 5847 5848 // C++ 9.5p1: An object of a class with a non-trivial 5849 // constructor, a non-trivial copy constructor, a non-trivial 5850 // destructor, or a non-trivial copy assignment operator 5851 // cannot be a member of a union, nor can an array of such 5852 // objects. 5853 // TODO: C++0x alters this restriction significantly. 5854 if (Record->isUnion()) { 5855 // We check for copy constructors before constructors 5856 // because otherwise we'll never get complaints about 5857 // copy constructors. 5858 5859 CXXSpecialMember member = CXXInvalid; 5860 if (!RDecl->hasTrivialCopyConstructor()) 5861 member = CXXCopyConstructor; 5862 else if (!RDecl->hasTrivialConstructor()) 5863 member = CXXConstructor; 5864 else if (!RDecl->hasTrivialCopyAssignment()) 5865 member = CXXCopyAssignment; 5866 else if (!RDecl->hasTrivialDestructor()) 5867 member = CXXDestructor; 5868 5869 if (member != CXXInvalid) { 5870 Diag(Loc, diag::err_illegal_union_member) << Name << member; 5871 DiagnoseNontrivial(RT, member); 5872 NewFD->setInvalidDecl(); 5873 } 5874 } 5875 } 5876 } 5877 } 5878 5879 // FIXME: We need to pass in the attributes given an AST 5880 // representation, not a parser representation. 5881 if (D) 5882 // FIXME: What to pass instead of TUScope? 5883 ProcessDeclAttributes(TUScope, NewFD, *D); 5884 5885 if (T.isObjCGCWeak()) 5886 Diag(Loc, diag::warn_attribute_weak_on_field); 5887 5888 NewFD->setAccess(AS); 5889 5890 // C++ [dcl.init.aggr]p1: 5891 // An aggregate is an array or a class (clause 9) with [...] no 5892 // private or protected non-static data members (clause 11). 5893 // A POD must be an aggregate. 5894 if (getLangOptions().CPlusPlus && 5895 (AS == AS_private || AS == AS_protected)) { 5896 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 5897 CXXRecord->setAggregate(false); 5898 CXXRecord->setPOD(false); 5899 } 5900 5901 return NewFD; 5902} 5903 5904/// DiagnoseNontrivial - Given that a class has a non-trivial 5905/// special member, figure out why. 5906void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 5907 QualType QT(T, 0U); 5908 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 5909 5910 // Check whether the member was user-declared. 5911 switch (member) { 5912 case CXXInvalid: 5913 break; 5914 5915 case CXXConstructor: 5916 if (RD->hasUserDeclaredConstructor()) { 5917 typedef CXXRecordDecl::ctor_iterator ctor_iter; 5918 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 5919 const FunctionDecl *body = 0; 5920 ci->getBody(body); 5921 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 5922 SourceLocation CtorLoc = ci->getLocation(); 5923 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5924 return; 5925 } 5926 } 5927 5928 assert(0 && "found no user-declared constructors"); 5929 return; 5930 } 5931 break; 5932 5933 case CXXCopyConstructor: 5934 if (RD->hasUserDeclaredCopyConstructor()) { 5935 SourceLocation CtorLoc = 5936 RD->getCopyConstructor(Context, 0)->getLocation(); 5937 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5938 return; 5939 } 5940 break; 5941 5942 case CXXCopyAssignment: 5943 if (RD->hasUserDeclaredCopyAssignment()) { 5944 // FIXME: this should use the location of the copy 5945 // assignment, not the type. 5946 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 5947 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 5948 return; 5949 } 5950 break; 5951 5952 case CXXDestructor: 5953 if (RD->hasUserDeclaredDestructor()) { 5954 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 5955 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5956 return; 5957 } 5958 break; 5959 } 5960 5961 typedef CXXRecordDecl::base_class_iterator base_iter; 5962 5963 // Virtual bases and members inhibit trivial copying/construction, 5964 // but not trivial destruction. 5965 if (member != CXXDestructor) { 5966 // Check for virtual bases. vbases includes indirect virtual bases, 5967 // so we just iterate through the direct bases. 5968 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 5969 if (bi->isVirtual()) { 5970 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5971 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 5972 return; 5973 } 5974 5975 // Check for virtual methods. 5976 typedef CXXRecordDecl::method_iterator meth_iter; 5977 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 5978 ++mi) { 5979 if (mi->isVirtual()) { 5980 SourceLocation MLoc = mi->getSourceRange().getBegin(); 5981 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 5982 return; 5983 } 5984 } 5985 } 5986 5987 bool (CXXRecordDecl::*hasTrivial)() const; 5988 switch (member) { 5989 case CXXConstructor: 5990 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 5991 case CXXCopyConstructor: 5992 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 5993 case CXXCopyAssignment: 5994 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 5995 case CXXDestructor: 5996 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 5997 default: 5998 assert(0 && "unexpected special member"); return; 5999 } 6000 6001 // Check for nontrivial bases (and recurse). 6002 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 6003 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 6004 assert(BaseRT && "Don't know how to handle dependent bases"); 6005 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 6006 if (!(BaseRecTy->*hasTrivial)()) { 6007 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6008 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 6009 DiagnoseNontrivial(BaseRT, member); 6010 return; 6011 } 6012 } 6013 6014 // Check for nontrivial members (and recurse). 6015 typedef RecordDecl::field_iterator field_iter; 6016 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 6017 ++fi) { 6018 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 6019 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 6020 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 6021 6022 if (!(EltRD->*hasTrivial)()) { 6023 SourceLocation FLoc = (*fi)->getLocation(); 6024 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 6025 DiagnoseNontrivial(EltRT, member); 6026 return; 6027 } 6028 } 6029 } 6030 6031 assert(0 && "found no explanation for non-trivial member"); 6032} 6033 6034/// TranslateIvarVisibility - Translate visibility from a token ID to an 6035/// AST enum value. 6036static ObjCIvarDecl::AccessControl 6037TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 6038 switch (ivarVisibility) { 6039 default: assert(0 && "Unknown visitibility kind"); 6040 case tok::objc_private: return ObjCIvarDecl::Private; 6041 case tok::objc_public: return ObjCIvarDecl::Public; 6042 case tok::objc_protected: return ObjCIvarDecl::Protected; 6043 case tok::objc_package: return ObjCIvarDecl::Package; 6044 } 6045} 6046 6047/// ActOnIvar - Each ivar field of an objective-c class is passed into this 6048/// in order to create an IvarDecl object for it. 6049Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 6050 SourceLocation DeclStart, 6051 DeclPtrTy IntfDecl, 6052 Declarator &D, ExprTy *BitfieldWidth, 6053 tok::ObjCKeywordKind Visibility) { 6054 6055 IdentifierInfo *II = D.getIdentifier(); 6056 Expr *BitWidth = (Expr*)BitfieldWidth; 6057 SourceLocation Loc = DeclStart; 6058 if (II) Loc = D.getIdentifierLoc(); 6059 6060 // FIXME: Unnamed fields can be handled in various different ways, for 6061 // example, unnamed unions inject all members into the struct namespace! 6062 6063 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6064 QualType T = TInfo->getType(); 6065 6066 if (BitWidth) { 6067 // 6.7.2.1p3, 6.7.2.1p4 6068 if (VerifyBitField(Loc, II, T, BitWidth)) { 6069 D.setInvalidType(); 6070 DeleteExpr(BitWidth); 6071 BitWidth = 0; 6072 } 6073 } else { 6074 // Not a bitfield. 6075 6076 // validate II. 6077 6078 } 6079 if (T->isReferenceType()) { 6080 Diag(Loc, diag::err_ivar_reference_type); 6081 D.setInvalidType(); 6082 } 6083 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6084 // than a variably modified type. 6085 else if (T->isVariablyModifiedType()) { 6086 Diag(Loc, diag::err_typecheck_ivar_variable_size); 6087 D.setInvalidType(); 6088 } 6089 6090 // Get the visibility (access control) for this ivar. 6091 ObjCIvarDecl::AccessControl ac = 6092 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 6093 : ObjCIvarDecl::None; 6094 // Must set ivar's DeclContext to its enclosing interface. 6095 ObjCContainerDecl *EnclosingDecl = IntfDecl.getAs<ObjCContainerDecl>(); 6096 ObjCContainerDecl *EnclosingContext; 6097 if (ObjCImplementationDecl *IMPDecl = 6098 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6099 // Case of ivar declared in an implementation. Context is that of its class. 6100 EnclosingContext = IMPDecl->getClassInterface(); 6101 assert(EnclosingContext && "Implementation has no class interface!"); 6102 } else { 6103 if (ObjCCategoryDecl *CDecl = 6104 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6105 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 6106 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 6107 return DeclPtrTy(); 6108 } 6109 } 6110 EnclosingContext = EnclosingDecl; 6111 } 6112 6113 // Construct the decl. 6114 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 6115 EnclosingContext, Loc, II, T, 6116 TInfo, ac, (Expr *)BitfieldWidth); 6117 6118 if (II) { 6119 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 6120 ForRedeclaration); 6121 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 6122 && !isa<TagDecl>(PrevDecl)) { 6123 Diag(Loc, diag::err_duplicate_member) << II; 6124 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6125 NewID->setInvalidDecl(); 6126 } 6127 } 6128 6129 // Process attributes attached to the ivar. 6130 ProcessDeclAttributes(S, NewID, D); 6131 6132 if (D.isInvalidType()) 6133 NewID->setInvalidDecl(); 6134 6135 if (II) { 6136 // FIXME: When interfaces are DeclContexts, we'll need to add 6137 // these to the interface. 6138 S->AddDecl(DeclPtrTy::make(NewID)); 6139 IdResolver.AddDecl(NewID); 6140 } 6141 6142 return DeclPtrTy::make(NewID); 6143} 6144 6145void Sema::ActOnFields(Scope* S, 6146 SourceLocation RecLoc, DeclPtrTy RecDecl, 6147 DeclPtrTy *Fields, unsigned NumFields, 6148 SourceLocation LBrac, SourceLocation RBrac, 6149 AttributeList *Attr) { 6150 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 6151 assert(EnclosingDecl && "missing record or interface decl"); 6152 6153 // If the decl this is being inserted into is invalid, then it may be a 6154 // redeclaration or some other bogus case. Don't try to add fields to it. 6155 if (EnclosingDecl->isInvalidDecl()) { 6156 // FIXME: Deallocate fields? 6157 return; 6158 } 6159 6160 6161 // Verify that all the fields are okay. 6162 unsigned NumNamedMembers = 0; 6163 llvm::SmallVector<FieldDecl*, 32> RecFields; 6164 6165 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 6166 for (unsigned i = 0; i != NumFields; ++i) { 6167 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 6168 6169 // Get the type for the field. 6170 Type *FDTy = FD->getType().getTypePtr(); 6171 6172 if (!FD->isAnonymousStructOrUnion()) { 6173 // Remember all fields written by the user. 6174 RecFields.push_back(FD); 6175 } 6176 6177 // If the field is already invalid for some reason, don't emit more 6178 // diagnostics about it. 6179 if (FD->isInvalidDecl()) { 6180 EnclosingDecl->setInvalidDecl(); 6181 continue; 6182 } 6183 6184 // C99 6.7.2.1p2: 6185 // A structure or union shall not contain a member with 6186 // incomplete or function type (hence, a structure shall not 6187 // contain an instance of itself, but may contain a pointer to 6188 // an instance of itself), except that the last member of a 6189 // structure with more than one named member may have incomplete 6190 // array type; such a structure (and any union containing, 6191 // possibly recursively, a member that is such a structure) 6192 // shall not be a member of a structure or an element of an 6193 // array. 6194 if (FDTy->isFunctionType()) { 6195 // Field declared as a function. 6196 Diag(FD->getLocation(), diag::err_field_declared_as_function) 6197 << FD->getDeclName(); 6198 FD->setInvalidDecl(); 6199 EnclosingDecl->setInvalidDecl(); 6200 continue; 6201 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 6202 Record && Record->isStruct()) { 6203 // Flexible array member. 6204 if (NumNamedMembers < 1) { 6205 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 6206 << FD->getDeclName(); 6207 FD->setInvalidDecl(); 6208 EnclosingDecl->setInvalidDecl(); 6209 continue; 6210 } 6211 if (!FD->getType()->isDependentType() && 6212 !Context.getBaseElementType(FD->getType())->isPODType()) { 6213 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 6214 << FD->getDeclName() << FD->getType(); 6215 FD->setInvalidDecl(); 6216 EnclosingDecl->setInvalidDecl(); 6217 continue; 6218 } 6219 6220 // Okay, we have a legal flexible array member at the end of the struct. 6221 if (Record) 6222 Record->setHasFlexibleArrayMember(true); 6223 } else if (!FDTy->isDependentType() && 6224 RequireCompleteType(FD->getLocation(), FD->getType(), 6225 diag::err_field_incomplete)) { 6226 // Incomplete type 6227 FD->setInvalidDecl(); 6228 EnclosingDecl->setInvalidDecl(); 6229 continue; 6230 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 6231 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 6232 // If this is a member of a union, then entire union becomes "flexible". 6233 if (Record && Record->isUnion()) { 6234 Record->setHasFlexibleArrayMember(true); 6235 } else { 6236 // If this is a struct/class and this is not the last element, reject 6237 // it. Note that GCC supports variable sized arrays in the middle of 6238 // structures. 6239 if (i != NumFields-1) 6240 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 6241 << FD->getDeclName() << FD->getType(); 6242 else { 6243 // We support flexible arrays at the end of structs in 6244 // other structs as an extension. 6245 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 6246 << FD->getDeclName(); 6247 if (Record) 6248 Record->setHasFlexibleArrayMember(true); 6249 } 6250 } 6251 } 6252 if (Record && FDTTy->getDecl()->hasObjectMember()) 6253 Record->setHasObjectMember(true); 6254 } else if (FDTy->isObjCObjectType()) { 6255 /// A field cannot be an Objective-c object 6256 Diag(FD->getLocation(), diag::err_statically_allocated_object); 6257 FD->setInvalidDecl(); 6258 EnclosingDecl->setInvalidDecl(); 6259 continue; 6260 } else if (getLangOptions().ObjC1 && 6261 getLangOptions().getGCMode() != LangOptions::NonGC && 6262 Record && 6263 (FD->getType()->isObjCObjectPointerType() || 6264 FD->getType().isObjCGCStrong())) 6265 Record->setHasObjectMember(true); 6266 else if (Context.getAsArrayType(FD->getType())) { 6267 QualType BaseType = Context.getBaseElementType(FD->getType()); 6268 if (Record && BaseType->isRecordType() && 6269 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 6270 Record->setHasObjectMember(true); 6271 } 6272 // Keep track of the number of named members. 6273 if (FD->getIdentifier()) 6274 ++NumNamedMembers; 6275 } 6276 6277 // Okay, we successfully defined 'Record'. 6278 if (Record) { 6279 Record->completeDefinition(); 6280 } else { 6281 ObjCIvarDecl **ClsFields = 6282 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 6283 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 6284 ID->setLocEnd(RBrac); 6285 // Add ivar's to class's DeclContext. 6286 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6287 ClsFields[i]->setLexicalDeclContext(ID); 6288 ID->addDecl(ClsFields[i]); 6289 } 6290 // Must enforce the rule that ivars in the base classes may not be 6291 // duplicates. 6292 if (ID->getSuperClass()) 6293 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 6294 } else if (ObjCImplementationDecl *IMPDecl = 6295 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6296 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 6297 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 6298 // Ivar declared in @implementation never belongs to the implementation. 6299 // Only it is in implementation's lexical context. 6300 ClsFields[I]->setLexicalDeclContext(IMPDecl); 6301 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 6302 } else if (ObjCCategoryDecl *CDecl = 6303 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6304 // case of ivars in class extension; all other cases have been 6305 // reported as errors elsewhere. 6306 // FIXME. Class extension does not have a LocEnd field. 6307 // CDecl->setLocEnd(RBrac); 6308 // Add ivar's to class extension's DeclContext. 6309 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6310 ClsFields[i]->setLexicalDeclContext(CDecl); 6311 CDecl->addDecl(ClsFields[i]); 6312 } 6313 } 6314 } 6315 6316 if (Attr) 6317 ProcessDeclAttributeList(S, Record, Attr); 6318} 6319 6320/// \brief Determine whether the given integral value is representable within 6321/// the given type T. 6322static bool isRepresentableIntegerValue(ASTContext &Context, 6323 llvm::APSInt &Value, 6324 QualType T) { 6325 assert(T->isIntegralType(Context) && "Integral type required!"); 6326 unsigned BitWidth = Context.getIntWidth(T); 6327 6328 if (Value.isUnsigned() || Value.isNonNegative()) 6329 return Value.getActiveBits() < BitWidth; 6330 6331 return Value.getMinSignedBits() <= BitWidth; 6332} 6333 6334// \brief Given an integral type, return the next larger integral type 6335// (or a NULL type of no such type exists). 6336static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 6337 // FIXME: Int128/UInt128 support, which also needs to be introduced into 6338 // enum checking below. 6339 assert(T->isIntegralType(Context) && "Integral type required!"); 6340 const unsigned NumTypes = 4; 6341 QualType SignedIntegralTypes[NumTypes] = { 6342 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 6343 }; 6344 QualType UnsignedIntegralTypes[NumTypes] = { 6345 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 6346 Context.UnsignedLongLongTy 6347 }; 6348 6349 unsigned BitWidth = Context.getTypeSize(T); 6350 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 6351 : UnsignedIntegralTypes; 6352 for (unsigned I = 0; I != NumTypes; ++I) 6353 if (Context.getTypeSize(Types[I]) > BitWidth) 6354 return Types[I]; 6355 6356 return QualType(); 6357} 6358 6359EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 6360 EnumConstantDecl *LastEnumConst, 6361 SourceLocation IdLoc, 6362 IdentifierInfo *Id, 6363 ExprArg val) { 6364 Expr *Val = (Expr *)val.get(); 6365 6366 unsigned IntWidth = Context.Target.getIntWidth(); 6367 llvm::APSInt EnumVal(IntWidth); 6368 QualType EltTy; 6369 if (Val) { 6370 if (Enum->isDependentType() || Val->isTypeDependent()) 6371 EltTy = Context.DependentTy; 6372 else { 6373 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 6374 SourceLocation ExpLoc; 6375 if (!Val->isValueDependent() && 6376 VerifyIntegerConstantExpression(Val, &EnumVal)) { 6377 Val = 0; 6378 } else { 6379 if (!getLangOptions().CPlusPlus) { 6380 // C99 6.7.2.2p2: 6381 // The expression that defines the value of an enumeration constant 6382 // shall be an integer constant expression that has a value 6383 // representable as an int. 6384 6385 // Complain if the value is not representable in an int. 6386 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 6387 Diag(IdLoc, diag::ext_enum_value_not_int) 6388 << EnumVal.toString(10) << Val->getSourceRange() 6389 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 6390 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 6391 // Force the type of the expression to 'int'. 6392 ImpCastExprToType(Val, Context.IntTy, CastExpr::CK_IntegralCast); 6393 6394 if (Val != val.get()) { 6395 val.release(); 6396 val = Val; 6397 } 6398 } 6399 } 6400 6401 // C++0x [dcl.enum]p5: 6402 // If the underlying type is not fixed, the type of each enumerator 6403 // is the type of its initializing value: 6404 // - If an initializer is specified for an enumerator, the 6405 // initializing value has the same type as the expression. 6406 EltTy = Val->getType(); 6407 } 6408 } 6409 } 6410 6411 if (!Val) { 6412 if (Enum->isDependentType()) 6413 EltTy = Context.DependentTy; 6414 else if (!LastEnumConst) { 6415 // C++0x [dcl.enum]p5: 6416 // If the underlying type is not fixed, the type of each enumerator 6417 // is the type of its initializing value: 6418 // - If no initializer is specified for the first enumerator, the 6419 // initializing value has an unspecified integral type. 6420 // 6421 // GCC uses 'int' for its unspecified integral type, as does 6422 // C99 6.7.2.2p3. 6423 EltTy = Context.IntTy; 6424 } else { 6425 // Assign the last value + 1. 6426 EnumVal = LastEnumConst->getInitVal(); 6427 ++EnumVal; 6428 EltTy = LastEnumConst->getType(); 6429 6430 // Check for overflow on increment. 6431 if (EnumVal < LastEnumConst->getInitVal()) { 6432 // C++0x [dcl.enum]p5: 6433 // If the underlying type is not fixed, the type of each enumerator 6434 // is the type of its initializing value: 6435 // 6436 // - Otherwise the type of the initializing value is the same as 6437 // the type of the initializing value of the preceding enumerator 6438 // unless the incremented value is not representable in that type, 6439 // in which case the type is an unspecified integral type 6440 // sufficient to contain the incremented value. If no such type 6441 // exists, the program is ill-formed. 6442 QualType T = getNextLargerIntegralType(Context, EltTy); 6443 if (T.isNull()) { 6444 // There is no integral type larger enough to represent this 6445 // value. Complain, then allow the value to wrap around. 6446 EnumVal = LastEnumConst->getInitVal(); 6447 EnumVal.zext(EnumVal.getBitWidth() * 2); 6448 Diag(IdLoc, diag::warn_enumerator_too_large) 6449 << EnumVal.toString(10); 6450 } else { 6451 EltTy = T; 6452 } 6453 6454 // Retrieve the last enumerator's value, extent that type to the 6455 // type that is supposed to be large enough to represent the incremented 6456 // value, then increment. 6457 EnumVal = LastEnumConst->getInitVal(); 6458 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6459 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 6460 ++EnumVal; 6461 6462 // If we're not in C++, diagnose the overflow of enumerator values, 6463 // which in C99 means that the enumerator value is not representable in 6464 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 6465 // permits enumerator values that are representable in some larger 6466 // integral type. 6467 if (!getLangOptions().CPlusPlus && !T.isNull()) 6468 Diag(IdLoc, diag::warn_enum_value_overflow); 6469 } else if (!getLangOptions().CPlusPlus && 6470 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 6471 // Enforce C99 6.7.2.2p2 even when we compute the next value. 6472 Diag(IdLoc, diag::ext_enum_value_not_int) 6473 << EnumVal.toString(10) << 1; 6474 } 6475 } 6476 } 6477 6478 if (!EltTy->isDependentType()) { 6479 // Make the enumerator value match the signedness and size of the 6480 // enumerator's type. 6481 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 6482 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6483 } 6484 6485 val.release(); 6486 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 6487 Val, EnumVal); 6488} 6489 6490 6491Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 6492 DeclPtrTy lastEnumConst, 6493 SourceLocation IdLoc, 6494 IdentifierInfo *Id, 6495 SourceLocation EqualLoc, ExprTy *val) { 6496 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 6497 EnumConstantDecl *LastEnumConst = 6498 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 6499 Expr *Val = static_cast<Expr*>(val); 6500 6501 // The scope passed in may not be a decl scope. Zip up the scope tree until 6502 // we find one that is. 6503 S = getNonFieldDeclScope(S); 6504 6505 // Verify that there isn't already something declared with this name in this 6506 // scope. 6507 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 6508 ForRedeclaration); 6509 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6510 // Maybe we will complain about the shadowed template parameter. 6511 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 6512 // Just pretend that we didn't see the previous declaration. 6513 PrevDecl = 0; 6514 } 6515 6516 if (PrevDecl) { 6517 // When in C++, we may get a TagDecl with the same name; in this case the 6518 // enum constant will 'hide' the tag. 6519 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 6520 "Received TagDecl when not in C++!"); 6521 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 6522 if (isa<EnumConstantDecl>(PrevDecl)) 6523 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 6524 else 6525 Diag(IdLoc, diag::err_redefinition) << Id; 6526 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6527 if (Val) Val->Destroy(Context); 6528 return DeclPtrTy(); 6529 } 6530 } 6531 6532 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 6533 IdLoc, Id, Owned(Val)); 6534 6535 // Register this decl in the current scope stack. 6536 if (New) { 6537 New->setAccess(TheEnumDecl->getAccess()); 6538 PushOnScopeChains(New, S); 6539 } 6540 6541 return DeclPtrTy::make(New); 6542} 6543 6544void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 6545 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 6546 DeclPtrTy *Elements, unsigned NumElements, 6547 Scope *S, AttributeList *Attr) { 6548 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 6549 QualType EnumType = Context.getTypeDeclType(Enum); 6550 6551 if (Attr) 6552 ProcessDeclAttributeList(S, Enum, Attr); 6553 6554 if (Enum->isDependentType()) { 6555 for (unsigned i = 0; i != NumElements; ++i) { 6556 EnumConstantDecl *ECD = 6557 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6558 if (!ECD) continue; 6559 6560 ECD->setType(EnumType); 6561 } 6562 6563 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 6564 return; 6565 } 6566 6567 // TODO: If the result value doesn't fit in an int, it must be a long or long 6568 // long value. ISO C does not support this, but GCC does as an extension, 6569 // emit a warning. 6570 unsigned IntWidth = Context.Target.getIntWidth(); 6571 unsigned CharWidth = Context.Target.getCharWidth(); 6572 unsigned ShortWidth = Context.Target.getShortWidth(); 6573 6574 // Verify that all the values are okay, compute the size of the values, and 6575 // reverse the list. 6576 unsigned NumNegativeBits = 0; 6577 unsigned NumPositiveBits = 0; 6578 6579 // Keep track of whether all elements have type int. 6580 bool AllElementsInt = true; 6581 6582 for (unsigned i = 0; i != NumElements; ++i) { 6583 EnumConstantDecl *ECD = 6584 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6585 if (!ECD) continue; // Already issued a diagnostic. 6586 6587 const llvm::APSInt &InitVal = ECD->getInitVal(); 6588 6589 // Keep track of the size of positive and negative values. 6590 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 6591 NumPositiveBits = std::max(NumPositiveBits, 6592 (unsigned)InitVal.getActiveBits()); 6593 else 6594 NumNegativeBits = std::max(NumNegativeBits, 6595 (unsigned)InitVal.getMinSignedBits()); 6596 6597 // Keep track of whether every enum element has type int (very commmon). 6598 if (AllElementsInt) 6599 AllElementsInt = ECD->getType() == Context.IntTy; 6600 } 6601 6602 // Figure out the type that should be used for this enum. 6603 // FIXME: Support -fshort-enums. 6604 QualType BestType; 6605 unsigned BestWidth; 6606 6607 // C++0x N3000 [conv.prom]p3: 6608 // An rvalue of an unscoped enumeration type whose underlying 6609 // type is not fixed can be converted to an rvalue of the first 6610 // of the following types that can represent all the values of 6611 // the enumeration: int, unsigned int, long int, unsigned long 6612 // int, long long int, or unsigned long long int. 6613 // C99 6.4.4.3p2: 6614 // An identifier declared as an enumeration constant has type int. 6615 // The C99 rule is modified by a gcc extension 6616 QualType BestPromotionType; 6617 6618 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 6619 6620 if (NumNegativeBits) { 6621 // If there is a negative value, figure out the smallest integer type (of 6622 // int/long/longlong) that fits. 6623 // If it's packed, check also if it fits a char or a short. 6624 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 6625 BestType = Context.SignedCharTy; 6626 BestWidth = CharWidth; 6627 } else if (Packed && NumNegativeBits <= ShortWidth && 6628 NumPositiveBits < ShortWidth) { 6629 BestType = Context.ShortTy; 6630 BestWidth = ShortWidth; 6631 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 6632 BestType = Context.IntTy; 6633 BestWidth = IntWidth; 6634 } else { 6635 BestWidth = Context.Target.getLongWidth(); 6636 6637 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 6638 BestType = Context.LongTy; 6639 } else { 6640 BestWidth = Context.Target.getLongLongWidth(); 6641 6642 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 6643 Diag(Enum->getLocation(), diag::warn_enum_too_large); 6644 BestType = Context.LongLongTy; 6645 } 6646 } 6647 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 6648 } else { 6649 // If there is no negative value, figure out the smallest type that fits 6650 // all of the enumerator values. 6651 // If it's packed, check also if it fits a char or a short. 6652 if (Packed && NumPositiveBits <= CharWidth) { 6653 BestType = Context.UnsignedCharTy; 6654 BestPromotionType = Context.IntTy; 6655 BestWidth = CharWidth; 6656 } else if (Packed && NumPositiveBits <= ShortWidth) { 6657 BestType = Context.UnsignedShortTy; 6658 BestPromotionType = Context.IntTy; 6659 BestWidth = ShortWidth; 6660 } else if (NumPositiveBits <= IntWidth) { 6661 BestType = Context.UnsignedIntTy; 6662 BestWidth = IntWidth; 6663 BestPromotionType 6664 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6665 ? Context.UnsignedIntTy : Context.IntTy; 6666 } else if (NumPositiveBits <= 6667 (BestWidth = Context.Target.getLongWidth())) { 6668 BestType = Context.UnsignedLongTy; 6669 BestPromotionType 6670 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6671 ? Context.UnsignedLongTy : Context.LongTy; 6672 } else { 6673 BestWidth = Context.Target.getLongLongWidth(); 6674 assert(NumPositiveBits <= BestWidth && 6675 "How could an initializer get larger than ULL?"); 6676 BestType = Context.UnsignedLongLongTy; 6677 BestPromotionType 6678 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6679 ? Context.UnsignedLongLongTy : Context.LongLongTy; 6680 } 6681 } 6682 6683 // Loop over all of the enumerator constants, changing their types to match 6684 // the type of the enum if needed. 6685 for (unsigned i = 0; i != NumElements; ++i) { 6686 EnumConstantDecl *ECD = 6687 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6688 if (!ECD) continue; // Already issued a diagnostic. 6689 6690 // Standard C says the enumerators have int type, but we allow, as an 6691 // extension, the enumerators to be larger than int size. If each 6692 // enumerator value fits in an int, type it as an int, otherwise type it the 6693 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 6694 // that X has type 'int', not 'unsigned'. 6695 6696 // Determine whether the value fits into an int. 6697 llvm::APSInt InitVal = ECD->getInitVal(); 6698 6699 // If it fits into an integer type, force it. Otherwise force it to match 6700 // the enum decl type. 6701 QualType NewTy; 6702 unsigned NewWidth; 6703 bool NewSign; 6704 if (!getLangOptions().CPlusPlus && 6705 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 6706 NewTy = Context.IntTy; 6707 NewWidth = IntWidth; 6708 NewSign = true; 6709 } else if (ECD->getType() == BestType) { 6710 // Already the right type! 6711 if (getLangOptions().CPlusPlus) 6712 // C++ [dcl.enum]p4: Following the closing brace of an 6713 // enum-specifier, each enumerator has the type of its 6714 // enumeration. 6715 ECD->setType(EnumType); 6716 continue; 6717 } else { 6718 NewTy = BestType; 6719 NewWidth = BestWidth; 6720 NewSign = BestType->isSignedIntegerType(); 6721 } 6722 6723 // Adjust the APSInt value. 6724 InitVal.extOrTrunc(NewWidth); 6725 InitVal.setIsSigned(NewSign); 6726 ECD->setInitVal(InitVal); 6727 6728 // Adjust the Expr initializer and type. 6729 if (ECD->getInitExpr()) 6730 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, 6731 CastExpr::CK_IntegralCast, 6732 ECD->getInitExpr(), 6733 CXXBaseSpecifierArray(), 6734 /*isLvalue=*/false)); 6735 if (getLangOptions().CPlusPlus) 6736 // C++ [dcl.enum]p4: Following the closing brace of an 6737 // enum-specifier, each enumerator has the type of its 6738 // enumeration. 6739 ECD->setType(EnumType); 6740 else 6741 ECD->setType(NewTy); 6742 } 6743 6744 Enum->completeDefinition(BestType, BestPromotionType, 6745 NumPositiveBits, NumNegativeBits); 6746} 6747 6748Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 6749 ExprArg expr) { 6750 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 6751 6752 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 6753 Loc, AsmString); 6754 CurContext->addDecl(New); 6755 return DeclPtrTy::make(New); 6756} 6757 6758void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 6759 SourceLocation PragmaLoc, 6760 SourceLocation NameLoc) { 6761 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 6762 6763 if (PrevDecl) { 6764 PrevDecl->addAttr(::new (Context) WeakAttr()); 6765 } else { 6766 (void)WeakUndeclaredIdentifiers.insert( 6767 std::pair<IdentifierInfo*,WeakInfo> 6768 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 6769 } 6770} 6771 6772void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 6773 IdentifierInfo* AliasName, 6774 SourceLocation PragmaLoc, 6775 SourceLocation NameLoc, 6776 SourceLocation AliasNameLoc) { 6777 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 6778 LookupOrdinaryName); 6779 WeakInfo W = WeakInfo(Name, NameLoc); 6780 6781 if (PrevDecl) { 6782 if (!PrevDecl->hasAttr<AliasAttr>()) 6783 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 6784 DeclApplyPragmaWeak(TUScope, ND, W); 6785 } else { 6786 (void)WeakUndeclaredIdentifiers.insert( 6787 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 6788 } 6789} 6790