SemaDecl.cpp revision 4bde1e13d39e43581f7da872e4d7676ebf4a3ee7
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, so build a 91 // DependentNameType 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 if (UnresolvedUsingTypenameDecl *UUDecl = 200 dyn_cast<UnresolvedUsingTypenameDecl>(IIDecl)) { 201 // FIXME: preserve source structure information. 202 T = Context.getDependentNameType(ETK_None, 203 UUDecl->getTargetNestedNameSpecifier(), 204 &II); 205 } else { 206 // If it's not plausibly a type, suppress diagnostics. 207 Result.suppressDiagnostics(); 208 return 0; 209 } 210 211 return T.getAsOpaquePtr(); 212} 213 214/// isTagName() - This method is called *for error recovery purposes only* 215/// to determine if the specified name is a valid tag name ("struct foo"). If 216/// so, this returns the TST for the tag corresponding to it (TST_enum, 217/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 218/// where the user forgot to specify the tag. 219DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 220 // Do a tag name lookup in this scope. 221 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 222 LookupName(R, S, false); 223 R.suppressDiagnostics(); 224 if (R.getResultKind() == LookupResult::Found) 225 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 226 switch (TD->getTagKind()) { 227 default: return DeclSpec::TST_unspecified; 228 case TTK_Struct: return DeclSpec::TST_struct; 229 case TTK_Union: return DeclSpec::TST_union; 230 case TTK_Class: return DeclSpec::TST_class; 231 case TTK_Enum: return DeclSpec::TST_enum; 232 } 233 } 234 235 return DeclSpec::TST_unspecified; 236} 237 238bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 239 SourceLocation IILoc, 240 Scope *S, 241 CXXScopeSpec *SS, 242 TypeTy *&SuggestedType) { 243 // We don't have anything to suggest (yet). 244 SuggestedType = 0; 245 246 // There may have been a typo in the name of the type. Look up typo 247 // results, in case we have something that we can suggest. 248 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 249 NotForRedeclaration); 250 251 if (DeclarationName Corrected = CorrectTypo(Lookup, S, SS, 0, 0, CTC_Type)) { 252 if (NamedDecl *Result = Lookup.getAsSingle<NamedDecl>()) { 253 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 254 !Result->isInvalidDecl()) { 255 // We found a similarly-named type or interface; suggest that. 256 if (!SS || !SS->isSet()) 257 Diag(IILoc, diag::err_unknown_typename_suggest) 258 << &II << Lookup.getLookupName() 259 << FixItHint::CreateReplacement(SourceRange(IILoc), 260 Result->getNameAsString()); 261 else if (DeclContext *DC = computeDeclContext(*SS, false)) 262 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 263 << &II << DC << Lookup.getLookupName() << SS->getRange() 264 << FixItHint::CreateReplacement(SourceRange(IILoc), 265 Result->getNameAsString()); 266 else 267 llvm_unreachable("could not have corrected a typo here"); 268 269 Diag(Result->getLocation(), diag::note_previous_decl) 270 << Result->getDeclName(); 271 272 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS); 273 return true; 274 } 275 } else if (Lookup.empty()) { 276 // We corrected to a keyword. 277 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 278 Diag(IILoc, diag::err_unknown_typename_suggest) 279 << &II << Corrected; 280 return true; 281 } 282 } 283 284 if (getLangOptions().CPlusPlus) { 285 // See if II is a class template that the user forgot to pass arguments to. 286 UnqualifiedId Name; 287 Name.setIdentifier(&II, IILoc); 288 CXXScopeSpec EmptySS; 289 TemplateTy TemplateResult; 290 bool MemberOfUnknownSpecialization; 291 if (isTemplateName(S, SS ? *SS : EmptySS, Name, 0, true, TemplateResult, 292 MemberOfUnknownSpecialization) == TNK_Type_template) { 293 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 294 Diag(IILoc, diag::err_template_missing_args) << TplName; 295 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 296 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 297 << TplDecl->getTemplateParameters()->getSourceRange(); 298 } 299 return true; 300 } 301 } 302 303 // FIXME: Should we move the logic that tries to recover from a missing tag 304 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 305 306 if (!SS || (!SS->isSet() && !SS->isInvalid())) 307 Diag(IILoc, diag::err_unknown_typename) << &II; 308 else if (DeclContext *DC = computeDeclContext(*SS, false)) 309 Diag(IILoc, diag::err_typename_nested_not_found) 310 << &II << DC << SS->getRange(); 311 else if (isDependentScopeSpecifier(*SS)) { 312 Diag(SS->getRange().getBegin(), diag::err_typename_missing) 313 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 314 << SourceRange(SS->getRange().getBegin(), IILoc) 315 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 316 SuggestedType = ActOnTypenameType(SourceLocation(), *SS, II, IILoc).get(); 317 } else { 318 assert(SS && SS->isInvalid() && 319 "Invalid scope specifier has already been diagnosed"); 320 } 321 322 return true; 323} 324 325// Determines the context to return to after temporarily entering a 326// context. This depends in an unnecessarily complicated way on the 327// exact ordering of callbacks from the parser. 328DeclContext *Sema::getContainingDC(DeclContext *DC) { 329 330 // Functions defined inline within classes aren't parsed until we've 331 // finished parsing the top-level class, so the top-level class is 332 // the context we'll need to return to. 333 if (isa<FunctionDecl>(DC)) { 334 DC = DC->getLexicalParent(); 335 336 // A function not defined within a class will always return to its 337 // lexical context. 338 if (!isa<CXXRecordDecl>(DC)) 339 return DC; 340 341 // A C++ inline method/friend is parsed *after* the topmost class 342 // it was declared in is fully parsed ("complete"); the topmost 343 // class is the context we need to return to. 344 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 345 DC = RD; 346 347 // Return the declaration context of the topmost class the inline method is 348 // declared in. 349 return DC; 350 } 351 352 if (isa<ObjCMethodDecl>(DC)) 353 return Context.getTranslationUnitDecl(); 354 355 return DC->getLexicalParent(); 356} 357 358void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 359 assert(getContainingDC(DC) == CurContext && 360 "The next DeclContext should be lexically contained in the current one."); 361 CurContext = DC; 362 S->setEntity(DC); 363} 364 365void Sema::PopDeclContext() { 366 assert(CurContext && "DeclContext imbalance!"); 367 368 CurContext = getContainingDC(CurContext); 369} 370 371/// EnterDeclaratorContext - Used when we must lookup names in the context 372/// of a declarator's nested name specifier. 373/// 374void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 375 // C++0x [basic.lookup.unqual]p13: 376 // A name used in the definition of a static data member of class 377 // X (after the qualified-id of the static member) is looked up as 378 // if the name was used in a member function of X. 379 // C++0x [basic.lookup.unqual]p14: 380 // If a variable member of a namespace is defined outside of the 381 // scope of its namespace then any name used in the definition of 382 // the variable member (after the declarator-id) is looked up as 383 // if the definition of the variable member occurred in its 384 // namespace. 385 // Both of these imply that we should push a scope whose context 386 // is the semantic context of the declaration. We can't use 387 // PushDeclContext here because that context is not necessarily 388 // lexically contained in the current context. Fortunately, 389 // the containing scope should have the appropriate information. 390 391 assert(!S->getEntity() && "scope already has entity"); 392 393#ifndef NDEBUG 394 Scope *Ancestor = S->getParent(); 395 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 396 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 397#endif 398 399 CurContext = DC; 400 S->setEntity(DC); 401} 402 403void Sema::ExitDeclaratorContext(Scope *S) { 404 assert(S->getEntity() == CurContext && "Context imbalance!"); 405 406 // Switch back to the lexical context. The safety of this is 407 // enforced by an assert in EnterDeclaratorContext. 408 Scope *Ancestor = S->getParent(); 409 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 410 CurContext = (DeclContext*) Ancestor->getEntity(); 411 412 // We don't need to do anything with the scope, which is going to 413 // disappear. 414} 415 416/// \brief Determine whether we allow overloading of the function 417/// PrevDecl with another declaration. 418/// 419/// This routine determines whether overloading is possible, not 420/// whether some new function is actually an overload. It will return 421/// true in C++ (where we can always provide overloads) or, as an 422/// extension, in C when the previous function is already an 423/// overloaded function declaration or has the "overloadable" 424/// attribute. 425static bool AllowOverloadingOfFunction(LookupResult &Previous, 426 ASTContext &Context) { 427 if (Context.getLangOptions().CPlusPlus) 428 return true; 429 430 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 431 return true; 432 433 return (Previous.getResultKind() == LookupResult::Found 434 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 435} 436 437/// Add this decl to the scope shadowed decl chains. 438void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 439 // Move up the scope chain until we find the nearest enclosing 440 // non-transparent context. The declaration will be introduced into this 441 // scope. 442 while (S->getEntity() && 443 ((DeclContext *)S->getEntity())->isTransparentContext()) 444 S = S->getParent(); 445 446 // Add scoped declarations into their context, so that they can be 447 // found later. Declarations without a context won't be inserted 448 // into any context. 449 if (AddToContext) 450 CurContext->addDecl(D); 451 452 // Out-of-line definitions shouldn't be pushed into scope in C++. 453 // Out-of-line variable and function definitions shouldn't even in C. 454 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 455 D->isOutOfLine()) 456 return; 457 458 // Template instantiations should also not be pushed into scope. 459 if (isa<FunctionDecl>(D) && 460 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 461 return; 462 463 // If this replaces anything in the current scope, 464 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 465 IEnd = IdResolver.end(); 466 for (; I != IEnd; ++I) { 467 if (S->isDeclScope(DeclPtrTy::make(*I)) && D->declarationReplaces(*I)) { 468 S->RemoveDecl(DeclPtrTy::make(*I)); 469 IdResolver.RemoveDecl(*I); 470 471 // Should only need to replace one decl. 472 break; 473 } 474 } 475 476 S->AddDecl(DeclPtrTy::make(D)); 477 IdResolver.AddDecl(D); 478} 479 480bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) { 481 return IdResolver.isDeclInScope(D, Ctx, Context, S); 482} 483 484static bool isOutOfScopePreviousDeclaration(NamedDecl *, 485 DeclContext*, 486 ASTContext&); 487 488/// Filters out lookup results that don't fall within the given scope 489/// as determined by isDeclInScope. 490static void FilterLookupForScope(Sema &SemaRef, LookupResult &R, 491 DeclContext *Ctx, Scope *S, 492 bool ConsiderLinkage) { 493 LookupResult::Filter F = R.makeFilter(); 494 while (F.hasNext()) { 495 NamedDecl *D = F.next(); 496 497 if (SemaRef.isDeclInScope(D, Ctx, S)) 498 continue; 499 500 if (ConsiderLinkage && 501 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context)) 502 continue; 503 504 F.erase(); 505 } 506 507 F.done(); 508} 509 510static bool isUsingDecl(NamedDecl *D) { 511 return isa<UsingShadowDecl>(D) || 512 isa<UnresolvedUsingTypenameDecl>(D) || 513 isa<UnresolvedUsingValueDecl>(D); 514} 515 516/// Removes using shadow declarations from the lookup results. 517static void RemoveUsingDecls(LookupResult &R) { 518 LookupResult::Filter F = R.makeFilter(); 519 while (F.hasNext()) 520 if (isUsingDecl(F.next())) 521 F.erase(); 522 523 F.done(); 524} 525 526static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 527 if (D->isInvalidDecl()) 528 return false; 529 530 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 531 return false; 532 533 // White-list anything that isn't a local variable. 534 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 535 !D->getDeclContext()->isFunctionOrMethod()) 536 return false; 537 538 // Types of valid local variables should be complete, so this should succeed. 539 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 540 541 // White-list anything with an __attribute__((unused)) type. 542 QualType Ty = VD->getType(); 543 544 // Only look at the outermost level of typedef. 545 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 546 if (TT->getDecl()->hasAttr<UnusedAttr>()) 547 return false; 548 } 549 550 // If we failed to complete the type for some reason, or if the type is 551 // dependent, don't diagnose the variable. 552 if (Ty->isIncompleteType() || Ty->isDependentType()) 553 return false; 554 555 if (const TagType *TT = Ty->getAs<TagType>()) { 556 const TagDecl *Tag = TT->getDecl(); 557 if (Tag->hasAttr<UnusedAttr>()) 558 return false; 559 560 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 561 // FIXME: Checking for the presence of a user-declared constructor 562 // isn't completely accurate; we'd prefer to check that the initializer 563 // has no side effects. 564 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 565 return false; 566 } 567 } 568 569 // TODO: __attribute__((unused)) templates? 570 } 571 572 return true; 573} 574 575void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 576 if (!ShouldDiagnoseUnusedDecl(D)) 577 return; 578 579 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 580 Diag(D->getLocation(), diag::warn_unused_exception_param) 581 << D->getDeclName(); 582 else 583 Diag(D->getLocation(), diag::warn_unused_variable) 584 << D->getDeclName(); 585} 586 587void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 588 if (S->decl_empty()) return; 589 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 590 "Scope shouldn't contain decls!"); 591 592 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 593 I != E; ++I) { 594 Decl *TmpD = (*I).getAs<Decl>(); 595 assert(TmpD && "This decl didn't get pushed??"); 596 597 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 598 NamedDecl *D = cast<NamedDecl>(TmpD); 599 600 if (!D->getDeclName()) continue; 601 602 // Diagnose unused variables in this scope. 603 if (S->getNumErrorsAtStart() == getDiagnostics().getNumErrors()) 604 DiagnoseUnusedDecl(D); 605 606 // Remove this name from our lexical scope. 607 IdResolver.RemoveDecl(D); 608 } 609} 610 611/// \brief Look for an Objective-C class in the translation unit. 612/// 613/// \param Id The name of the Objective-C class we're looking for. If 614/// typo-correction fixes this name, the Id will be updated 615/// to the fixed name. 616/// 617/// \param IdLoc The location of the name in the translation unit. 618/// 619/// \param TypoCorrection If true, this routine will attempt typo correction 620/// if there is no class with the given name. 621/// 622/// \returns The declaration of the named Objective-C class, or NULL if the 623/// class could not be found. 624ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 625 SourceLocation IdLoc, 626 bool TypoCorrection) { 627 // The third "scope" argument is 0 since we aren't enabling lazy built-in 628 // creation from this context. 629 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 630 631 if (!IDecl && TypoCorrection) { 632 // Perform typo correction at the given location, but only if we 633 // find an Objective-C class name. 634 LookupResult R(*this, Id, IdLoc, LookupOrdinaryName); 635 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 636 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 637 Diag(IdLoc, diag::err_undef_interface_suggest) 638 << Id << IDecl->getDeclName() 639 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 640 Diag(IDecl->getLocation(), diag::note_previous_decl) 641 << IDecl->getDeclName(); 642 643 Id = IDecl->getIdentifier(); 644 } 645 } 646 647 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 648} 649 650/// getNonFieldDeclScope - Retrieves the innermost scope, starting 651/// from S, where a non-field would be declared. This routine copes 652/// with the difference between C and C++ scoping rules in structs and 653/// unions. For example, the following code is well-formed in C but 654/// ill-formed in C++: 655/// @code 656/// struct S6 { 657/// enum { BAR } e; 658/// }; 659/// 660/// void test_S6() { 661/// struct S6 a; 662/// a.e = BAR; 663/// } 664/// @endcode 665/// For the declaration of BAR, this routine will return a different 666/// scope. The scope S will be the scope of the unnamed enumeration 667/// within S6. In C++, this routine will return the scope associated 668/// with S6, because the enumeration's scope is a transparent 669/// context but structures can contain non-field names. In C, this 670/// routine will return the translation unit scope, since the 671/// enumeration's scope is a transparent context and structures cannot 672/// contain non-field names. 673Scope *Sema::getNonFieldDeclScope(Scope *S) { 674 while (((S->getFlags() & Scope::DeclScope) == 0) || 675 (S->getEntity() && 676 ((DeclContext *)S->getEntity())->isTransparentContext()) || 677 (S->isClassScope() && !getLangOptions().CPlusPlus)) 678 S = S->getParent(); 679 return S; 680} 681 682void Sema::InitBuiltinVaListType() { 683 if (!Context.getBuiltinVaListType().isNull()) 684 return; 685 686 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 687 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, SourceLocation(), 688 LookupOrdinaryName, ForRedeclaration); 689 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 690 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 691} 692 693/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 694/// file scope. lazily create a decl for it. ForRedeclaration is true 695/// if we're creating this built-in in anticipation of redeclaring the 696/// built-in. 697NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 698 Scope *S, bool ForRedeclaration, 699 SourceLocation Loc) { 700 Builtin::ID BID = (Builtin::ID)bid; 701 702 if (Context.BuiltinInfo.hasVAListUse(BID)) 703 InitBuiltinVaListType(); 704 705 ASTContext::GetBuiltinTypeError Error; 706 QualType R = Context.GetBuiltinType(BID, Error); 707 switch (Error) { 708 case ASTContext::GE_None: 709 // Okay 710 break; 711 712 case ASTContext::GE_Missing_stdio: 713 if (ForRedeclaration) 714 Diag(Loc, diag::err_implicit_decl_requires_stdio) 715 << Context.BuiltinInfo.GetName(BID); 716 return 0; 717 718 case ASTContext::GE_Missing_setjmp: 719 if (ForRedeclaration) 720 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 721 << Context.BuiltinInfo.GetName(BID); 722 return 0; 723 } 724 725 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 726 Diag(Loc, diag::ext_implicit_lib_function_decl) 727 << Context.BuiltinInfo.GetName(BID) 728 << R; 729 if (Context.BuiltinInfo.getHeaderName(BID) && 730 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 731 != Diagnostic::Ignored) 732 Diag(Loc, diag::note_please_include_header) 733 << Context.BuiltinInfo.getHeaderName(BID) 734 << Context.BuiltinInfo.GetName(BID); 735 } 736 737 FunctionDecl *New = FunctionDecl::Create(Context, 738 Context.getTranslationUnitDecl(), 739 Loc, II, R, /*TInfo=*/0, 740 FunctionDecl::Extern, 741 FunctionDecl::None, false, 742 /*hasPrototype=*/true); 743 New->setImplicit(); 744 745 // Create Decl objects for each parameter, adding them to the 746 // FunctionDecl. 747 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 748 llvm::SmallVector<ParmVarDecl*, 16> Params; 749 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 750 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 751 FT->getArgType(i), /*TInfo=*/0, 752 VarDecl::None, VarDecl::None, 0)); 753 New->setParams(Params.data(), Params.size()); 754 } 755 756 AddKnownFunctionAttributes(New); 757 758 // TUScope is the translation-unit scope to insert this function into. 759 // FIXME: This is hideous. We need to teach PushOnScopeChains to 760 // relate Scopes to DeclContexts, and probably eliminate CurContext 761 // entirely, but we're not there yet. 762 DeclContext *SavedContext = CurContext; 763 CurContext = Context.getTranslationUnitDecl(); 764 PushOnScopeChains(New, TUScope); 765 CurContext = SavedContext; 766 return New; 767} 768 769/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 770/// same name and scope as a previous declaration 'Old'. Figure out 771/// how to resolve this situation, merging decls or emitting 772/// diagnostics as appropriate. If there was an error, set New to be invalid. 773/// 774void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 775 // If the new decl is known invalid already, don't bother doing any 776 // merging checks. 777 if (New->isInvalidDecl()) return; 778 779 // Allow multiple definitions for ObjC built-in typedefs. 780 // FIXME: Verify the underlying types are equivalent! 781 if (getLangOptions().ObjC1) { 782 const IdentifierInfo *TypeID = New->getIdentifier(); 783 switch (TypeID->getLength()) { 784 default: break; 785 case 2: 786 if (!TypeID->isStr("id")) 787 break; 788 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 789 // Install the built-in type for 'id', ignoring the current definition. 790 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 791 return; 792 case 5: 793 if (!TypeID->isStr("Class")) 794 break; 795 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 796 // Install the built-in type for 'Class', ignoring the current definition. 797 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 798 return; 799 case 3: 800 if (!TypeID->isStr("SEL")) 801 break; 802 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 803 // Install the built-in type for 'SEL', ignoring the current definition. 804 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 805 return; 806 case 8: 807 if (!TypeID->isStr("Protocol")) 808 break; 809 Context.setObjCProtoType(New->getUnderlyingType()); 810 return; 811 } 812 // Fall through - the typedef name was not a builtin type. 813 } 814 815 // Verify the old decl was also a type. 816 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 817 if (!Old) { 818 Diag(New->getLocation(), diag::err_redefinition_different_kind) 819 << New->getDeclName(); 820 821 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 822 if (OldD->getLocation().isValid()) 823 Diag(OldD->getLocation(), diag::note_previous_definition); 824 825 return New->setInvalidDecl(); 826 } 827 828 // If the old declaration is invalid, just give up here. 829 if (Old->isInvalidDecl()) 830 return New->setInvalidDecl(); 831 832 // Determine the "old" type we'll use for checking and diagnostics. 833 QualType OldType; 834 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 835 OldType = OldTypedef->getUnderlyingType(); 836 else 837 OldType = Context.getTypeDeclType(Old); 838 839 // If the typedef types are not identical, reject them in all languages and 840 // with any extensions enabled. 841 842 if (OldType != New->getUnderlyingType() && 843 Context.getCanonicalType(OldType) != 844 Context.getCanonicalType(New->getUnderlyingType())) { 845 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 846 << New->getUnderlyingType() << OldType; 847 if (Old->getLocation().isValid()) 848 Diag(Old->getLocation(), diag::note_previous_definition); 849 return New->setInvalidDecl(); 850 } 851 852 // The types match. Link up the redeclaration chain if the old 853 // declaration was a typedef. 854 // FIXME: this is a potential source of wierdness if the type 855 // spellings don't match exactly. 856 if (isa<TypedefDecl>(Old)) 857 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 858 859 if (getLangOptions().Microsoft) 860 return; 861 862 if (getLangOptions().CPlusPlus) { 863 // C++ [dcl.typedef]p2: 864 // In a given non-class scope, a typedef specifier can be used to 865 // redefine the name of any type declared in that scope to refer 866 // to the type to which it already refers. 867 if (!isa<CXXRecordDecl>(CurContext)) 868 return; 869 870 // C++0x [dcl.typedef]p4: 871 // In a given class scope, a typedef specifier can be used to redefine 872 // any class-name declared in that scope that is not also a typedef-name 873 // to refer to the type to which it already refers. 874 // 875 // This wording came in via DR424, which was a correction to the 876 // wording in DR56, which accidentally banned code like: 877 // 878 // struct S { 879 // typedef struct A { } A; 880 // }; 881 // 882 // in the C++03 standard. We implement the C++0x semantics, which 883 // allow the above but disallow 884 // 885 // struct S { 886 // typedef int I; 887 // typedef int I; 888 // }; 889 // 890 // since that was the intent of DR56. 891 if (!isa<TypedefDecl >(Old)) 892 return; 893 894 Diag(New->getLocation(), diag::err_redefinition) 895 << New->getDeclName(); 896 Diag(Old->getLocation(), diag::note_previous_definition); 897 return New->setInvalidDecl(); 898 } 899 900 // If we have a redefinition of a typedef in C, emit a warning. This warning 901 // is normally mapped to an error, but can be controlled with 902 // -Wtypedef-redefinition. If either the original or the redefinition is 903 // in a system header, don't emit this for compatibility with GCC. 904 if (getDiagnostics().getSuppressSystemWarnings() && 905 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 906 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 907 return; 908 909 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 910 << New->getDeclName(); 911 Diag(Old->getLocation(), diag::note_previous_definition); 912 return; 913} 914 915/// DeclhasAttr - returns true if decl Declaration already has the target 916/// attribute. 917static bool 918DeclHasAttr(const Decl *decl, const Attr *target) { 919 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 920 if (attr->getKind() == target->getKind()) 921 return true; 922 923 return false; 924} 925 926/// MergeAttributes - append attributes from the Old decl to the New one. 927static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 928 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 929 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 930 Attr *NewAttr = attr->clone(C); 931 NewAttr->setInherited(true); 932 New->addAttr(NewAttr); 933 } 934 } 935} 936 937/// Used in MergeFunctionDecl to keep track of function parameters in 938/// C. 939struct GNUCompatibleParamWarning { 940 ParmVarDecl *OldParm; 941 ParmVarDecl *NewParm; 942 QualType PromotedType; 943}; 944 945 946/// getSpecialMember - get the special member enum for a method. 947Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 948 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 949 if (Ctor->isCopyConstructor()) 950 return Sema::CXXCopyConstructor; 951 952 return Sema::CXXConstructor; 953 } 954 955 if (isa<CXXDestructorDecl>(MD)) 956 return Sema::CXXDestructor; 957 958 assert(MD->isCopyAssignment() && "Must have copy assignment operator"); 959 return Sema::CXXCopyAssignment; 960} 961 962/// canREdefineFunction - checks if a function can be redefined. Currently, 963/// only extern inline functions can be redefined, and even then only in 964/// GNU89 mode. 965static bool canRedefineFunction(const FunctionDecl *FD, 966 const LangOptions& LangOpts) { 967 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 968 FD->isInlineSpecified() && 969 FD->getStorageClass() == FunctionDecl::Extern); 970} 971 972/// MergeFunctionDecl - We just parsed a function 'New' from 973/// declarator D which has the same name and scope as a previous 974/// declaration 'Old'. Figure out how to resolve this situation, 975/// merging decls or emitting diagnostics as appropriate. 976/// 977/// In C++, New and Old must be declarations that are not 978/// overloaded. Use IsOverload to determine whether New and Old are 979/// overloaded, and to select the Old declaration that New should be 980/// merged with. 981/// 982/// Returns true if there was an error, false otherwise. 983bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 984 // Verify the old decl was also a function. 985 FunctionDecl *Old = 0; 986 if (FunctionTemplateDecl *OldFunctionTemplate 987 = dyn_cast<FunctionTemplateDecl>(OldD)) 988 Old = OldFunctionTemplate->getTemplatedDecl(); 989 else 990 Old = dyn_cast<FunctionDecl>(OldD); 991 if (!Old) { 992 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 993 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 994 Diag(Shadow->getTargetDecl()->getLocation(), 995 diag::note_using_decl_target); 996 Diag(Shadow->getUsingDecl()->getLocation(), 997 diag::note_using_decl) << 0; 998 return true; 999 } 1000 1001 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1002 << New->getDeclName(); 1003 Diag(OldD->getLocation(), diag::note_previous_definition); 1004 return true; 1005 } 1006 1007 // Determine whether the previous declaration was a definition, 1008 // implicit declaration, or a declaration. 1009 diag::kind PrevDiag; 1010 if (Old->isThisDeclarationADefinition()) 1011 PrevDiag = diag::note_previous_definition; 1012 else if (Old->isImplicit()) 1013 PrevDiag = diag::note_previous_implicit_declaration; 1014 else 1015 PrevDiag = diag::note_previous_declaration; 1016 1017 QualType OldQType = Context.getCanonicalType(Old->getType()); 1018 QualType NewQType = Context.getCanonicalType(New->getType()); 1019 1020 // Don't complain about this if we're in GNU89 mode and the old function 1021 // is an extern inline function. 1022 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1023 New->getStorageClass() == FunctionDecl::Static && 1024 Old->getStorageClass() != FunctionDecl::Static && 1025 !canRedefineFunction(Old, getLangOptions())) { 1026 Diag(New->getLocation(), diag::err_static_non_static) 1027 << New; 1028 Diag(Old->getLocation(), PrevDiag); 1029 return true; 1030 } 1031 1032 // If a function is first declared with a calling convention, but is 1033 // later declared or defined without one, the second decl assumes the 1034 // calling convention of the first. 1035 // 1036 // For the new decl, we have to look at the NON-canonical type to tell the 1037 // difference between a function that really doesn't have a calling 1038 // convention and one that is declared cdecl. That's because in 1039 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1040 // because it is the default calling convention. 1041 // 1042 // Note also that we DO NOT return at this point, because we still have 1043 // other tests to run. 1044 const FunctionType *OldType = OldQType->getAs<FunctionType>(); 1045 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1046 const FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1047 const FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1048 if (OldTypeInfo.getCC() != CC_Default && 1049 NewTypeInfo.getCC() == CC_Default) { 1050 NewQType = Context.getCallConvType(NewQType, OldTypeInfo.getCC()); 1051 New->setType(NewQType); 1052 NewQType = Context.getCanonicalType(NewQType); 1053 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1054 NewTypeInfo.getCC())) { 1055 // Calling conventions really aren't compatible, so complain. 1056 Diag(New->getLocation(), diag::err_cconv_change) 1057 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1058 << (OldTypeInfo.getCC() == CC_Default) 1059 << (OldTypeInfo.getCC() == CC_Default ? "" : 1060 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1061 Diag(Old->getLocation(), diag::note_previous_declaration); 1062 return true; 1063 } 1064 1065 // FIXME: diagnose the other way around? 1066 if (OldType->getNoReturnAttr() && 1067 !NewType->getNoReturnAttr()) { 1068 NewQType = Context.getNoReturnType(NewQType); 1069 New->setType(NewQType); 1070 assert(NewQType.isCanonical()); 1071 } 1072 1073 if (getLangOptions().CPlusPlus) { 1074 // (C++98 13.1p2): 1075 // Certain function declarations cannot be overloaded: 1076 // -- Function declarations that differ only in the return type 1077 // cannot be overloaded. 1078 QualType OldReturnType 1079 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1080 QualType NewReturnType 1081 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1082 QualType ResQT; 1083 if (OldReturnType != NewReturnType) { 1084 if (NewReturnType->isObjCObjectPointerType() 1085 && OldReturnType->isObjCObjectPointerType()) 1086 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1087 if (ResQT.isNull()) { 1088 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1089 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1090 return true; 1091 } 1092 else 1093 NewQType = ResQT; 1094 } 1095 1096 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1097 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1098 if (OldMethod && NewMethod) { 1099 // Preserve triviality. 1100 NewMethod->setTrivial(OldMethod->isTrivial()); 1101 1102 bool isFriend = NewMethod->getFriendObjectKind(); 1103 1104 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) { 1105 // -- Member function declarations with the same name and the 1106 // same parameter types cannot be overloaded if any of them 1107 // is a static member function declaration. 1108 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1109 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1110 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1111 return true; 1112 } 1113 1114 // C++ [class.mem]p1: 1115 // [...] A member shall not be declared twice in the 1116 // member-specification, except that a nested class or member 1117 // class template can be declared and then later defined. 1118 unsigned NewDiag; 1119 if (isa<CXXConstructorDecl>(OldMethod)) 1120 NewDiag = diag::err_constructor_redeclared; 1121 else if (isa<CXXDestructorDecl>(NewMethod)) 1122 NewDiag = diag::err_destructor_redeclared; 1123 else if (isa<CXXConversionDecl>(NewMethod)) 1124 NewDiag = diag::err_conv_function_redeclared; 1125 else 1126 NewDiag = diag::err_member_redeclared; 1127 1128 Diag(New->getLocation(), NewDiag); 1129 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1130 1131 // Complain if this is an explicit declaration of a special 1132 // member that was initially declared implicitly. 1133 // 1134 // As an exception, it's okay to befriend such methods in order 1135 // to permit the implicit constructor/destructor/operator calls. 1136 } else if (OldMethod->isImplicit()) { 1137 if (isFriend) { 1138 NewMethod->setImplicit(); 1139 } else { 1140 Diag(NewMethod->getLocation(), 1141 diag::err_definition_of_implicitly_declared_member) 1142 << New << getSpecialMember(OldMethod); 1143 return true; 1144 } 1145 } 1146 } 1147 1148 // (C++98 8.3.5p3): 1149 // All declarations for a function shall agree exactly in both the 1150 // return type and the parameter-type-list. 1151 // attributes should be ignored when comparing. 1152 if (Context.getNoReturnType(OldQType, false) == 1153 Context.getNoReturnType(NewQType, false)) 1154 return MergeCompatibleFunctionDecls(New, Old); 1155 1156 // Fall through for conflicting redeclarations and redefinitions. 1157 } 1158 1159 // C: Function types need to be compatible, not identical. This handles 1160 // duplicate function decls like "void f(int); void f(enum X);" properly. 1161 if (!getLangOptions().CPlusPlus && 1162 Context.typesAreCompatible(OldQType, NewQType)) { 1163 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1164 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1165 const FunctionProtoType *OldProto = 0; 1166 if (isa<FunctionNoProtoType>(NewFuncType) && 1167 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1168 // The old declaration provided a function prototype, but the 1169 // new declaration does not. Merge in the prototype. 1170 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1171 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1172 OldProto->arg_type_end()); 1173 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1174 ParamTypes.data(), ParamTypes.size(), 1175 OldProto->isVariadic(), 1176 OldProto->getTypeQuals(), 1177 false, false, 0, 0, 1178 OldProto->getExtInfo()); 1179 New->setType(NewQType); 1180 New->setHasInheritedPrototype(); 1181 1182 // Synthesize a parameter for each argument type. 1183 llvm::SmallVector<ParmVarDecl*, 16> Params; 1184 for (FunctionProtoType::arg_type_iterator 1185 ParamType = OldProto->arg_type_begin(), 1186 ParamEnd = OldProto->arg_type_end(); 1187 ParamType != ParamEnd; ++ParamType) { 1188 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1189 SourceLocation(), 0, 1190 *ParamType, /*TInfo=*/0, 1191 VarDecl::None, VarDecl::None, 1192 0); 1193 Param->setImplicit(); 1194 Params.push_back(Param); 1195 } 1196 1197 New->setParams(Params.data(), Params.size()); 1198 } 1199 1200 return MergeCompatibleFunctionDecls(New, Old); 1201 } 1202 1203 // GNU C permits a K&R definition to follow a prototype declaration 1204 // if the declared types of the parameters in the K&R definition 1205 // match the types in the prototype declaration, even when the 1206 // promoted types of the parameters from the K&R definition differ 1207 // from the types in the prototype. GCC then keeps the types from 1208 // the prototype. 1209 // 1210 // If a variadic prototype is followed by a non-variadic K&R definition, 1211 // the K&R definition becomes variadic. This is sort of an edge case, but 1212 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1213 // C99 6.9.1p8. 1214 if (!getLangOptions().CPlusPlus && 1215 Old->hasPrototype() && !New->hasPrototype() && 1216 New->getType()->getAs<FunctionProtoType>() && 1217 Old->getNumParams() == New->getNumParams()) { 1218 llvm::SmallVector<QualType, 16> ArgTypes; 1219 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1220 const FunctionProtoType *OldProto 1221 = Old->getType()->getAs<FunctionProtoType>(); 1222 const FunctionProtoType *NewProto 1223 = New->getType()->getAs<FunctionProtoType>(); 1224 1225 // Determine whether this is the GNU C extension. 1226 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1227 NewProto->getResultType()); 1228 bool LooseCompatible = !MergedReturn.isNull(); 1229 for (unsigned Idx = 0, End = Old->getNumParams(); 1230 LooseCompatible && Idx != End; ++Idx) { 1231 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1232 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1233 if (Context.typesAreCompatible(OldParm->getType(), 1234 NewProto->getArgType(Idx))) { 1235 ArgTypes.push_back(NewParm->getType()); 1236 } else if (Context.typesAreCompatible(OldParm->getType(), 1237 NewParm->getType())) { 1238 GNUCompatibleParamWarning Warn 1239 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1240 Warnings.push_back(Warn); 1241 ArgTypes.push_back(NewParm->getType()); 1242 } else 1243 LooseCompatible = false; 1244 } 1245 1246 if (LooseCompatible) { 1247 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1248 Diag(Warnings[Warn].NewParm->getLocation(), 1249 diag::ext_param_promoted_not_compatible_with_prototype) 1250 << Warnings[Warn].PromotedType 1251 << Warnings[Warn].OldParm->getType(); 1252 Diag(Warnings[Warn].OldParm->getLocation(), 1253 diag::note_previous_declaration); 1254 } 1255 1256 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1257 ArgTypes.size(), 1258 OldProto->isVariadic(), 0, 1259 false, false, 0, 0, 1260 OldProto->getExtInfo())); 1261 return MergeCompatibleFunctionDecls(New, Old); 1262 } 1263 1264 // Fall through to diagnose conflicting types. 1265 } 1266 1267 // A function that has already been declared has been redeclared or defined 1268 // with a different type- show appropriate diagnostic 1269 if (unsigned BuiltinID = Old->getBuiltinID()) { 1270 // The user has declared a builtin function with an incompatible 1271 // signature. 1272 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1273 // The function the user is redeclaring is a library-defined 1274 // function like 'malloc' or 'printf'. Warn about the 1275 // redeclaration, then pretend that we don't know about this 1276 // library built-in. 1277 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1278 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1279 << Old << Old->getType(); 1280 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1281 Old->setInvalidDecl(); 1282 return false; 1283 } 1284 1285 PrevDiag = diag::note_previous_builtin_declaration; 1286 } 1287 1288 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1289 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1290 return true; 1291} 1292 1293/// \brief Completes the merge of two function declarations that are 1294/// known to be compatible. 1295/// 1296/// This routine handles the merging of attributes and other 1297/// properties of function declarations form the old declaration to 1298/// the new declaration, once we know that New is in fact a 1299/// redeclaration of Old. 1300/// 1301/// \returns false 1302bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1303 // Merge the attributes 1304 MergeAttributes(New, Old, Context); 1305 1306 // Merge the storage class. 1307 if (Old->getStorageClass() != FunctionDecl::Extern && 1308 Old->getStorageClass() != FunctionDecl::None) 1309 New->setStorageClass(Old->getStorageClass()); 1310 1311 // Merge "pure" flag. 1312 if (Old->isPure()) 1313 New->setPure(); 1314 1315 // Merge the "deleted" flag. 1316 if (Old->isDeleted()) 1317 New->setDeleted(); 1318 1319 if (getLangOptions().CPlusPlus) 1320 return MergeCXXFunctionDecl(New, Old); 1321 1322 return false; 1323} 1324 1325/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1326/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1327/// situation, merging decls or emitting diagnostics as appropriate. 1328/// 1329/// Tentative definition rules (C99 6.9.2p2) are checked by 1330/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1331/// definitions here, since the initializer hasn't been attached. 1332/// 1333void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1334 // If the new decl is already invalid, don't do any other checking. 1335 if (New->isInvalidDecl()) 1336 return; 1337 1338 // Verify the old decl was also a variable. 1339 VarDecl *Old = 0; 1340 if (!Previous.isSingleResult() || 1341 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1342 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1343 << New->getDeclName(); 1344 Diag(Previous.getRepresentativeDecl()->getLocation(), 1345 diag::note_previous_definition); 1346 return New->setInvalidDecl(); 1347 } 1348 1349 MergeAttributes(New, Old, Context); 1350 1351 // Merge the types 1352 QualType MergedT; 1353 if (getLangOptions().CPlusPlus) { 1354 if (Context.hasSameType(New->getType(), Old->getType())) 1355 MergedT = New->getType(); 1356 // C++ [basic.link]p10: 1357 // [...] the types specified by all declarations referring to a given 1358 // object or function shall be identical, except that declarations for an 1359 // array object can specify array types that differ by the presence or 1360 // absence of a major array bound (8.3.4). 1361 else if (Old->getType()->isIncompleteArrayType() && 1362 New->getType()->isArrayType()) { 1363 CanQual<ArrayType> OldArray 1364 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1365 CanQual<ArrayType> NewArray 1366 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1367 if (OldArray->getElementType() == NewArray->getElementType()) 1368 MergedT = New->getType(); 1369 } else if (Old->getType()->isArrayType() && 1370 New->getType()->isIncompleteArrayType()) { 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 = Old->getType(); 1377 } else if (New->getType()->isObjCObjectPointerType() 1378 && Old->getType()->isObjCObjectPointerType()) { 1379 MergedT = Context.mergeObjCGCQualifiers(New->getType(), Old->getType()); 1380 } 1381 } else { 1382 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1383 } 1384 if (MergedT.isNull()) { 1385 Diag(New->getLocation(), diag::err_redefinition_different_type) 1386 << New->getDeclName(); 1387 Diag(Old->getLocation(), diag::note_previous_definition); 1388 return New->setInvalidDecl(); 1389 } 1390 New->setType(MergedT); 1391 1392 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1393 if (New->getStorageClass() == VarDecl::Static && 1394 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 1395 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1396 Diag(Old->getLocation(), diag::note_previous_definition); 1397 return New->setInvalidDecl(); 1398 } 1399 // C99 6.2.2p4: 1400 // For an identifier declared with the storage-class specifier 1401 // extern in a scope in which a prior declaration of that 1402 // identifier is visible,23) if the prior declaration specifies 1403 // internal or external linkage, the linkage of the identifier at 1404 // the later declaration is the same as the linkage specified at 1405 // the prior declaration. If no prior declaration is visible, or 1406 // if the prior declaration specifies no linkage, then the 1407 // identifier has external linkage. 1408 if (New->hasExternalStorage() && Old->hasLinkage()) 1409 /* Okay */; 1410 else if (New->getStorageClass() != VarDecl::Static && 1411 Old->getStorageClass() == VarDecl::Static) { 1412 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1413 Diag(Old->getLocation(), diag::note_previous_definition); 1414 return New->setInvalidDecl(); 1415 } 1416 1417 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1418 1419 // FIXME: The test for external storage here seems wrong? We still 1420 // need to check for mismatches. 1421 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1422 // Don't complain about out-of-line definitions of static members. 1423 !(Old->getLexicalDeclContext()->isRecord() && 1424 !New->getLexicalDeclContext()->isRecord())) { 1425 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1426 Diag(Old->getLocation(), diag::note_previous_definition); 1427 return New->setInvalidDecl(); 1428 } 1429 1430 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1431 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1432 Diag(Old->getLocation(), diag::note_previous_definition); 1433 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1434 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1435 Diag(Old->getLocation(), diag::note_previous_definition); 1436 } 1437 1438 // C++ doesn't have tentative definitions, so go right ahead and check here. 1439 const VarDecl *Def; 1440 if (getLangOptions().CPlusPlus && 1441 New->isThisDeclarationADefinition() == VarDecl::Definition && 1442 (Def = Old->getDefinition())) { 1443 Diag(New->getLocation(), diag::err_redefinition) 1444 << New->getDeclName(); 1445 Diag(Def->getLocation(), diag::note_previous_definition); 1446 New->setInvalidDecl(); 1447 return; 1448 } 1449 1450 // Keep a chain of previous declarations. 1451 New->setPreviousDeclaration(Old); 1452 1453 // Inherit access appropriately. 1454 New->setAccess(Old->getAccess()); 1455} 1456 1457/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1458/// no declarator (e.g. "struct foo;") is parsed. 1459Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 1460 DeclSpec &DS) { 1461 // FIXME: Error on auto/register at file scope 1462 // FIXME: Error on inline/virtual/explicit 1463 // FIXME: Warn on useless __thread 1464 // FIXME: Warn on useless const/volatile 1465 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1466 // FIXME: Warn on useless attributes 1467 Decl *TagD = 0; 1468 TagDecl *Tag = 0; 1469 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1470 DS.getTypeSpecType() == DeclSpec::TST_struct || 1471 DS.getTypeSpecType() == DeclSpec::TST_union || 1472 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1473 TagD = static_cast<Decl *>(DS.getTypeRep()); 1474 1475 if (!TagD) // We probably had an error 1476 return DeclPtrTy(); 1477 1478 // Note that the above type specs guarantee that the 1479 // type rep is a Decl, whereas in many of the others 1480 // it's a Type. 1481 Tag = dyn_cast<TagDecl>(TagD); 1482 } 1483 1484 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1485 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1486 // or incomplete types shall not be restrict-qualified." 1487 if (TypeQuals & DeclSpec::TQ_restrict) 1488 Diag(DS.getRestrictSpecLoc(), 1489 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1490 << DS.getSourceRange(); 1491 } 1492 1493 if (DS.isFriendSpecified()) { 1494 // If we're dealing with a class template decl, assume that the 1495 // template routines are handling it. 1496 if (TagD && isa<ClassTemplateDecl>(TagD)) 1497 return DeclPtrTy(); 1498 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1499 } 1500 1501 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1502 // If there are attributes in the DeclSpec, apply them to the record. 1503 if (const AttributeList *AL = DS.getAttributes()) 1504 ProcessDeclAttributeList(S, Record, AL); 1505 1506 if (!Record->getDeclName() && Record->isDefinition() && 1507 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1508 if (getLangOptions().CPlusPlus || 1509 Record->getDeclContext()->isRecord()) 1510 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 1511 1512 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1513 << DS.getSourceRange(); 1514 } 1515 1516 // Microsoft allows unnamed struct/union fields. Don't complain 1517 // about them. 1518 // FIXME: Should we support Microsoft's extensions in this area? 1519 if (Record->getDeclName() && getLangOptions().Microsoft) 1520 return DeclPtrTy::make(Tag); 1521 } 1522 1523 if (!DS.isMissingDeclaratorOk() && 1524 DS.getTypeSpecType() != DeclSpec::TST_error) { 1525 // Warn about typedefs of enums without names, since this is an 1526 // extension in both Microsoft an GNU. 1527 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1528 Tag && isa<EnumDecl>(Tag)) { 1529 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1530 << DS.getSourceRange(); 1531 return DeclPtrTy::make(Tag); 1532 } 1533 1534 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1535 << DS.getSourceRange(); 1536 } 1537 1538 return DeclPtrTy::make(Tag); 1539} 1540 1541/// We are trying to inject an anonymous member into the given scope; 1542/// check if there's an existing declaration that can't be overloaded. 1543/// 1544/// \return true if this is a forbidden redeclaration 1545static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1546 Scope *S, 1547 DeclContext *Owner, 1548 DeclarationName Name, 1549 SourceLocation NameLoc, 1550 unsigned diagnostic) { 1551 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1552 Sema::ForRedeclaration); 1553 if (!SemaRef.LookupName(R, S)) return false; 1554 1555 if (R.getAsSingle<TagDecl>()) 1556 return false; 1557 1558 // Pick a representative declaration. 1559 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1560 if (PrevDecl && Owner->isRecord()) { 1561 RecordDecl *Record = cast<RecordDecl>(Owner); 1562 if (!SemaRef.isDeclInScope(PrevDecl, Record, S)) 1563 return false; 1564 } 1565 1566 SemaRef.Diag(NameLoc, diagnostic) << Name; 1567 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1568 1569 return true; 1570} 1571 1572/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1573/// anonymous struct or union AnonRecord into the owning context Owner 1574/// and scope S. This routine will be invoked just after we realize 1575/// that an unnamed union or struct is actually an anonymous union or 1576/// struct, e.g., 1577/// 1578/// @code 1579/// union { 1580/// int i; 1581/// float f; 1582/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1583/// // f into the surrounding scope.x 1584/// @endcode 1585/// 1586/// This routine is recursive, injecting the names of nested anonymous 1587/// structs/unions into the owning context and scope as well. 1588static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 1589 DeclContext *Owner, 1590 RecordDecl *AnonRecord, 1591 AccessSpecifier AS) { 1592 unsigned diagKind 1593 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1594 : diag::err_anonymous_struct_member_redecl; 1595 1596 bool Invalid = false; 1597 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1598 FEnd = AnonRecord->field_end(); 1599 F != FEnd; ++F) { 1600 if ((*F)->getDeclName()) { 1601 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, (*F)->getDeclName(), 1602 (*F)->getLocation(), diagKind)) { 1603 // C++ [class.union]p2: 1604 // The names of the members of an anonymous union shall be 1605 // distinct from the names of any other entity in the 1606 // scope in which the anonymous union is declared. 1607 Invalid = true; 1608 } else { 1609 // C++ [class.union]p2: 1610 // For the purpose of name lookup, after the anonymous union 1611 // definition, the members of the anonymous union are 1612 // considered to have been defined in the scope in which the 1613 // anonymous union is declared. 1614 Owner->makeDeclVisibleInContext(*F); 1615 S->AddDecl(Sema::DeclPtrTy::make(*F)); 1616 SemaRef.IdResolver.AddDecl(*F); 1617 1618 // That includes picking up the appropriate access specifier. 1619 if (AS != AS_none) (*F)->setAccess(AS); 1620 } 1621 } else if (const RecordType *InnerRecordType 1622 = (*F)->getType()->getAs<RecordType>()) { 1623 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1624 if (InnerRecord->isAnonymousStructOrUnion()) 1625 Invalid = Invalid || 1626 InjectAnonymousStructOrUnionMembers(SemaRef, S, Owner, 1627 InnerRecord, AS); 1628 } 1629 } 1630 1631 return Invalid; 1632} 1633 1634/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 1635/// a VarDecl::StorageClass. Any error reporting is up to the caller: 1636/// illegal input values are mapped to VarDecl::None. 1637/// If the input declaration context is a linkage specification 1638/// with no braces, then Extern is mapped to None. 1639static VarDecl::StorageClass 1640StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec, 1641 DeclContext *DC) { 1642 switch (StorageClassSpec) { 1643 case DeclSpec::SCS_unspecified: return VarDecl::None; 1644 case DeclSpec::SCS_extern: 1645 // If the current context is a C++ linkage specification 1646 // having no braces, then the keyword "extern" is properly part 1647 // of the linkage specification itself, rather than being 1648 // the written storage class specifier. 1649 return (DC && isa<LinkageSpecDecl>(DC) && 1650 !cast<LinkageSpecDecl>(DC)->hasBraces()) 1651 ? VarDecl::None : VarDecl::Extern; 1652 case DeclSpec::SCS_static: return VarDecl::Static; 1653 case DeclSpec::SCS_auto: return VarDecl::Auto; 1654 case DeclSpec::SCS_register: return VarDecl::Register; 1655 case DeclSpec::SCS_private_extern: return VarDecl::PrivateExtern; 1656 // Illegal SCSs map to None: error reporting is up to the caller. 1657 case DeclSpec::SCS_mutable: // Fall through. 1658 case DeclSpec::SCS_typedef: return VarDecl::None; 1659 } 1660 llvm_unreachable("unknown storage class specifier"); 1661} 1662 1663/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 1664/// a FunctionDecl::StorageClass. Any error reporting is up to the caller: 1665/// illegal input values are mapped to FunctionDecl::None. 1666/// If the input declaration context is a linkage specification 1667/// with no braces, then Extern is mapped to None. 1668static FunctionDecl::StorageClass 1669StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec, 1670 DeclContext *DC) { 1671 switch (StorageClassSpec) { 1672 case DeclSpec::SCS_unspecified: return FunctionDecl::None; 1673 case DeclSpec::SCS_extern: 1674 // If the current context is a C++ linkage specification 1675 // having no braces, then the keyword "extern" is properly part 1676 // of the linkage specification itself, rather than being 1677 // the written storage class specifier. 1678 return (DC && isa<LinkageSpecDecl>(DC) && 1679 !cast<LinkageSpecDecl>(DC)->hasBraces()) 1680 ? FunctionDecl::None : FunctionDecl::Extern; 1681 case DeclSpec::SCS_static: return FunctionDecl::Static; 1682 case DeclSpec::SCS_private_extern: return FunctionDecl::PrivateExtern; 1683 // Illegal SCSs map to None: error reporting is up to the caller. 1684 case DeclSpec::SCS_auto: // Fall through. 1685 case DeclSpec::SCS_mutable: // Fall through. 1686 case DeclSpec::SCS_register: // Fall through. 1687 case DeclSpec::SCS_typedef: return FunctionDecl::None; 1688 } 1689 llvm_unreachable("unknown storage class specifier"); 1690} 1691 1692/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1693/// anonymous structure or union. Anonymous unions are a C++ feature 1694/// (C++ [class.union]) and a GNU C extension; anonymous structures 1695/// are a GNU C and GNU C++ extension. 1696Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1697 AccessSpecifier AS, 1698 RecordDecl *Record) { 1699 DeclContext *Owner = Record->getDeclContext(); 1700 1701 // Diagnose whether this anonymous struct/union is an extension. 1702 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1703 Diag(Record->getLocation(), diag::ext_anonymous_union); 1704 else if (!Record->isUnion()) 1705 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1706 1707 // C and C++ require different kinds of checks for anonymous 1708 // structs/unions. 1709 bool Invalid = false; 1710 if (getLangOptions().CPlusPlus) { 1711 const char* PrevSpec = 0; 1712 unsigned DiagID; 1713 // C++ [class.union]p3: 1714 // Anonymous unions declared in a named namespace or in the 1715 // global namespace shall be declared static. 1716 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1717 (isa<TranslationUnitDecl>(Owner) || 1718 (isa<NamespaceDecl>(Owner) && 1719 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1720 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1721 Invalid = true; 1722 1723 // Recover by adding 'static'. 1724 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1725 PrevSpec, DiagID); 1726 } 1727 // C++ [class.union]p3: 1728 // A storage class is not allowed in a declaration of an 1729 // anonymous union in a class scope. 1730 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1731 isa<RecordDecl>(Owner)) { 1732 Diag(DS.getStorageClassSpecLoc(), 1733 diag::err_anonymous_union_with_storage_spec); 1734 Invalid = true; 1735 1736 // Recover by removing the storage specifier. 1737 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1738 PrevSpec, DiagID); 1739 } 1740 1741 // C++ [class.union]p2: 1742 // The member-specification of an anonymous union shall only 1743 // define non-static data members. [Note: nested types and 1744 // functions cannot be declared within an anonymous union. ] 1745 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1746 MemEnd = Record->decls_end(); 1747 Mem != MemEnd; ++Mem) { 1748 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1749 // C++ [class.union]p3: 1750 // An anonymous union shall not have private or protected 1751 // members (clause 11). 1752 assert(FD->getAccess() != AS_none); 1753 if (FD->getAccess() != AS_public) { 1754 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1755 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1756 Invalid = true; 1757 } 1758 } else if ((*Mem)->isImplicit()) { 1759 // Any implicit members are fine. 1760 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1761 // This is a type that showed up in an 1762 // elaborated-type-specifier inside the anonymous struct or 1763 // union, but which actually declares a type outside of the 1764 // anonymous struct or union. It's okay. 1765 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1766 if (!MemRecord->isAnonymousStructOrUnion() && 1767 MemRecord->getDeclName()) { 1768 // This is a nested type declaration. 1769 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1770 << (int)Record->isUnion(); 1771 Invalid = true; 1772 } 1773 } else { 1774 // We have something that isn't a non-static data 1775 // member. Complain about it. 1776 unsigned DK = diag::err_anonymous_record_bad_member; 1777 if (isa<TypeDecl>(*Mem)) 1778 DK = diag::err_anonymous_record_with_type; 1779 else if (isa<FunctionDecl>(*Mem)) 1780 DK = diag::err_anonymous_record_with_function; 1781 else if (isa<VarDecl>(*Mem)) 1782 DK = diag::err_anonymous_record_with_static; 1783 Diag((*Mem)->getLocation(), DK) 1784 << (int)Record->isUnion(); 1785 Invalid = true; 1786 } 1787 } 1788 } 1789 1790 if (!Record->isUnion() && !Owner->isRecord()) { 1791 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1792 << (int)getLangOptions().CPlusPlus; 1793 Invalid = true; 1794 } 1795 1796 // Mock up a declarator. 1797 Declarator Dc(DS, Declarator::TypeNameContext); 1798 TypeSourceInfo *TInfo = 0; 1799 GetTypeForDeclarator(Dc, S, &TInfo); 1800 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1801 1802 // Create a declaration for this anonymous struct/union. 1803 NamedDecl *Anon = 0; 1804 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1805 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1806 /*IdentifierInfo=*/0, 1807 Context.getTypeDeclType(Record), 1808 TInfo, 1809 /*BitWidth=*/0, /*Mutable=*/false); 1810 Anon->setAccess(AS); 1811 if (getLangOptions().CPlusPlus) { 1812 FieldCollector->Add(cast<FieldDecl>(Anon)); 1813 if (!cast<CXXRecordDecl>(Record)->isEmpty()) 1814 cast<CXXRecordDecl>(OwningClass)->setEmpty(false); 1815 } 1816 } else { 1817 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 1818 assert(SCSpec != DeclSpec::SCS_typedef && 1819 "Parser allowed 'typedef' as storage class VarDecl."); 1820 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec, 0); 1821 if (SCSpec == DeclSpec::SCS_mutable) { 1822 // mutable can only appear on non-static class members, so it's always 1823 // an error here 1824 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1825 Invalid = true; 1826 SC = VarDecl::None; 1827 } 1828 SCSpec = DS.getStorageClassSpecAsWritten(); 1829 VarDecl::StorageClass SCAsWritten 1830 = StorageClassSpecToVarDeclStorageClass(SCSpec, 0); 1831 1832 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1833 /*IdentifierInfo=*/0, 1834 Context.getTypeDeclType(Record), 1835 TInfo, SC, SCAsWritten); 1836 } 1837 Anon->setImplicit(); 1838 1839 // Add the anonymous struct/union object to the current 1840 // context. We'll be referencing this object when we refer to one of 1841 // its members. 1842 Owner->addDecl(Anon); 1843 1844 // Inject the members of the anonymous struct/union into the owning 1845 // context and into the identifier resolver chain for name lookup 1846 // purposes. 1847 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS)) 1848 Invalid = true; 1849 1850 // Mark this as an anonymous struct/union type. Note that we do not 1851 // do this until after we have already checked and injected the 1852 // members of this anonymous struct/union type, because otherwise 1853 // the members could be injected twice: once by DeclContext when it 1854 // builds its lookup table, and once by 1855 // InjectAnonymousStructOrUnionMembers. 1856 Record->setAnonymousStructOrUnion(true); 1857 1858 if (Invalid) 1859 Anon->setInvalidDecl(); 1860 1861 return DeclPtrTy::make(Anon); 1862} 1863 1864 1865/// GetNameForDeclarator - Determine the full declaration name for the 1866/// given Declarator. 1867DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1868 return GetNameFromUnqualifiedId(D.getName()); 1869} 1870 1871/// \brief Retrieves the canonicalized name from a parsed unqualified-id. 1872DeclarationName Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 1873 switch (Name.getKind()) { 1874 case UnqualifiedId::IK_Identifier: 1875 return DeclarationName(Name.Identifier); 1876 1877 case UnqualifiedId::IK_OperatorFunctionId: 1878 return Context.DeclarationNames.getCXXOperatorName( 1879 Name.OperatorFunctionId.Operator); 1880 1881 case UnqualifiedId::IK_LiteralOperatorId: 1882 return Context.DeclarationNames.getCXXLiteralOperatorName( 1883 Name.Identifier); 1884 1885 case UnqualifiedId::IK_ConversionFunctionId: { 1886 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId); 1887 if (Ty.isNull()) 1888 return DeclarationName(); 1889 1890 return Context.DeclarationNames.getCXXConversionFunctionName( 1891 Context.getCanonicalType(Ty)); 1892 } 1893 1894 case UnqualifiedId::IK_ConstructorName: { 1895 QualType Ty = GetTypeFromParser(Name.ConstructorName); 1896 if (Ty.isNull()) 1897 return DeclarationName(); 1898 1899 return Context.DeclarationNames.getCXXConstructorName( 1900 Context.getCanonicalType(Ty)); 1901 } 1902 1903 case UnqualifiedId::IK_ConstructorTemplateId: { 1904 // In well-formed code, we can only have a constructor 1905 // template-id that refers to the current context, so go there 1906 // to find the actual type being constructed. 1907 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 1908 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 1909 return DeclarationName(); 1910 1911 // Determine the type of the class being constructed. 1912 QualType CurClassType = Context.getTypeDeclType(CurClass); 1913 1914 // FIXME: Check two things: that the template-id names the same type as 1915 // CurClassType, and that the template-id does not occur when the name 1916 // was qualified. 1917 1918 return Context.DeclarationNames.getCXXConstructorName( 1919 Context.getCanonicalType(CurClassType)); 1920 } 1921 1922 case UnqualifiedId::IK_DestructorName: { 1923 QualType Ty = GetTypeFromParser(Name.DestructorName); 1924 if (Ty.isNull()) 1925 return DeclarationName(); 1926 1927 return Context.DeclarationNames.getCXXDestructorName( 1928 Context.getCanonicalType(Ty)); 1929 } 1930 1931 case UnqualifiedId::IK_TemplateId: { 1932 TemplateName TName 1933 = TemplateName::getFromVoidPointer(Name.TemplateId->Template); 1934 return Context.getNameForTemplate(TName); 1935 } 1936 } 1937 1938 assert(false && "Unknown name kind"); 1939 return DeclarationName(); 1940} 1941 1942/// isNearlyMatchingFunction - Determine whether the C++ functions 1943/// Declaration and Definition are "nearly" matching. This heuristic 1944/// is used to improve diagnostics in the case where an out-of-line 1945/// function definition doesn't match any declaration within 1946/// the class or namespace. 1947static bool isNearlyMatchingFunction(ASTContext &Context, 1948 FunctionDecl *Declaration, 1949 FunctionDecl *Definition) { 1950 if (Declaration->param_size() != Definition->param_size()) 1951 return false; 1952 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1953 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1954 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1955 1956 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 1957 DefParamTy.getNonReferenceType())) 1958 return false; 1959 } 1960 1961 return true; 1962} 1963 1964/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 1965/// declarator needs to be rebuilt in the current instantiation. 1966/// Any bits of declarator which appear before the name are valid for 1967/// consideration here. That's specifically the type in the decl spec 1968/// and the base type in any member-pointer chunks. 1969static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 1970 DeclarationName Name) { 1971 // The types we specifically need to rebuild are: 1972 // - typenames, typeofs, and decltypes 1973 // - types which will become injected class names 1974 // Of course, we also need to rebuild any type referencing such a 1975 // type. It's safest to just say "dependent", but we call out a 1976 // few cases here. 1977 1978 DeclSpec &DS = D.getMutableDeclSpec(); 1979 switch (DS.getTypeSpecType()) { 1980 case DeclSpec::TST_typename: 1981 case DeclSpec::TST_typeofType: 1982 case DeclSpec::TST_typeofExpr: 1983 case DeclSpec::TST_decltype: { 1984 // Grab the type from the parser. 1985 TypeSourceInfo *TSI = 0; 1986 QualType T = S.GetTypeFromParser(DS.getTypeRep(), &TSI); 1987 if (T.isNull() || !T->isDependentType()) break; 1988 1989 // Make sure there's a type source info. This isn't really much 1990 // of a waste; most dependent types should have type source info 1991 // attached already. 1992 if (!TSI) 1993 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 1994 1995 // Rebuild the type in the current instantiation. 1996 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 1997 if (!TSI) return true; 1998 1999 // Store the new type back in the decl spec. 2000 QualType LocType = S.CreateLocInfoType(TSI->getType(), TSI); 2001 DS.UpdateTypeRep(LocType.getAsOpaquePtr()); 2002 break; 2003 } 2004 2005 default: 2006 // Nothing to do for these decl specs. 2007 break; 2008 } 2009 2010 // It doesn't matter what order we do this in. 2011 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2012 DeclaratorChunk &Chunk = D.getTypeObject(I); 2013 2014 // The only type information in the declarator which can come 2015 // before the declaration name is the base type of a member 2016 // pointer. 2017 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2018 continue; 2019 2020 // Rebuild the scope specifier in-place. 2021 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2022 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2023 return true; 2024 } 2025 2026 return false; 2027} 2028 2029Sema::DeclPtrTy 2030Sema::HandleDeclarator(Scope *S, Declarator &D, 2031 MultiTemplateParamsArg TemplateParamLists, 2032 bool IsFunctionDefinition) { 2033 DeclarationName Name = GetNameForDeclarator(D); 2034 2035 // All of these full declarators require an identifier. If it doesn't have 2036 // one, the ParsedFreeStandingDeclSpec action should be used. 2037 if (!Name) { 2038 if (!D.isInvalidType()) // Reject this if we think it is valid. 2039 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2040 diag::err_declarator_need_ident) 2041 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2042 return DeclPtrTy(); 2043 } 2044 2045 // The scope passed in may not be a decl scope. Zip up the scope tree until 2046 // we find one that is. 2047 while ((S->getFlags() & Scope::DeclScope) == 0 || 2048 (S->getFlags() & Scope::TemplateParamScope) != 0) 2049 S = S->getParent(); 2050 2051 DeclContext *DC = CurContext; 2052 if (D.getCXXScopeSpec().isInvalid()) 2053 D.setInvalidType(); 2054 else if (D.getCXXScopeSpec().isSet()) { 2055 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2056 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2057 if (!DC) { 2058 // If we could not compute the declaration context, it's because the 2059 // declaration context is dependent but does not refer to a class, 2060 // class template, or class template partial specialization. Complain 2061 // and return early, to avoid the coming semantic disaster. 2062 Diag(D.getIdentifierLoc(), 2063 diag::err_template_qualified_declarator_no_match) 2064 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2065 << D.getCXXScopeSpec().getRange(); 2066 return DeclPtrTy(); 2067 } 2068 2069 bool IsDependentContext = DC->isDependentContext(); 2070 2071 if (!IsDependentContext && 2072 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2073 return DeclPtrTy(); 2074 2075 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 2076 Diag(D.getIdentifierLoc(), 2077 diag::err_member_def_undefined_record) 2078 << Name << DC << D.getCXXScopeSpec().getRange(); 2079 D.setInvalidType(); 2080 } 2081 2082 // Check whether we need to rebuild the type of the given 2083 // declaration in the current instantiation. 2084 if (EnteringContext && IsDependentContext && 2085 TemplateParamLists.size() != 0) { 2086 ContextRAII SavedContext(*this, DC); 2087 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 2088 D.setInvalidType(); 2089 } 2090 } 2091 2092 NamedDecl *New; 2093 2094 TypeSourceInfo *TInfo = 0; 2095 QualType R = GetTypeForDeclarator(D, S, &TInfo); 2096 2097 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 2098 ForRedeclaration); 2099 2100 // See if this is a redefinition of a variable in the same scope. 2101 if (!D.getCXXScopeSpec().isSet()) { 2102 bool IsLinkageLookup = false; 2103 2104 // If the declaration we're planning to build will be a function 2105 // or object with linkage, then look for another declaration with 2106 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 2107 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2108 /* Do nothing*/; 2109 else if (R->isFunctionType()) { 2110 if (CurContext->isFunctionOrMethod() || 2111 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2112 IsLinkageLookup = true; 2113 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 2114 IsLinkageLookup = true; 2115 else if (CurContext->getLookupContext()->isTranslationUnit() && 2116 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2117 IsLinkageLookup = true; 2118 2119 if (IsLinkageLookup) 2120 Previous.clear(LookupRedeclarationWithLinkage); 2121 2122 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 2123 } else { // Something like "int foo::x;" 2124 LookupQualifiedName(Previous, DC); 2125 2126 // Don't consider using declarations as previous declarations for 2127 // out-of-line members. 2128 RemoveUsingDecls(Previous); 2129 2130 // C++ 7.3.1.2p2: 2131 // Members (including explicit specializations of templates) of a named 2132 // namespace can also be defined outside that namespace by explicit 2133 // qualification of the name being defined, provided that the entity being 2134 // defined was already declared in the namespace and the definition appears 2135 // after the point of declaration in a namespace that encloses the 2136 // declarations namespace. 2137 // 2138 // Note that we only check the context at this point. We don't yet 2139 // have enough information to make sure that PrevDecl is actually 2140 // the declaration we want to match. For example, given: 2141 // 2142 // class X { 2143 // void f(); 2144 // void f(float); 2145 // }; 2146 // 2147 // void X::f(int) { } // ill-formed 2148 // 2149 // In this case, PrevDecl will point to the overload set 2150 // containing the two f's declared in X, but neither of them 2151 // matches. 2152 2153 // First check whether we named the global scope. 2154 if (isa<TranslationUnitDecl>(DC)) { 2155 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 2156 << Name << D.getCXXScopeSpec().getRange(); 2157 } else { 2158 DeclContext *Cur = CurContext; 2159 while (isa<LinkageSpecDecl>(Cur)) 2160 Cur = Cur->getParent(); 2161 if (!Cur->Encloses(DC)) { 2162 // The qualifying scope doesn't enclose the original declaration. 2163 // Emit diagnostic based on current scope. 2164 SourceLocation L = D.getIdentifierLoc(); 2165 SourceRange R = D.getCXXScopeSpec().getRange(); 2166 if (isa<FunctionDecl>(Cur)) 2167 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 2168 else 2169 Diag(L, diag::err_invalid_declarator_scope) 2170 << Name << cast<NamedDecl>(DC) << R; 2171 D.setInvalidType(); 2172 } 2173 } 2174 } 2175 2176 if (Previous.isSingleResult() && 2177 Previous.getFoundDecl()->isTemplateParameter()) { 2178 // Maybe we will complain about the shadowed template parameter. 2179 if (!D.isInvalidType()) 2180 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2181 Previous.getFoundDecl())) 2182 D.setInvalidType(); 2183 2184 // Just pretend that we didn't see the previous declaration. 2185 Previous.clear(); 2186 } 2187 2188 // In C++, the previous declaration we find might be a tag type 2189 // (class or enum). In this case, the new declaration will hide the 2190 // tag type. Note that this does does not apply if we're declaring a 2191 // typedef (C++ [dcl.typedef]p4). 2192 if (Previous.isSingleTagDecl() && 2193 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2194 Previous.clear(); 2195 2196 bool Redeclaration = false; 2197 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2198 if (TemplateParamLists.size()) { 2199 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2200 return DeclPtrTy(); 2201 } 2202 2203 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2204 } else if (R->isFunctionType()) { 2205 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2206 move(TemplateParamLists), 2207 IsFunctionDefinition, Redeclaration); 2208 } else { 2209 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2210 move(TemplateParamLists), 2211 Redeclaration); 2212 } 2213 2214 if (New == 0) 2215 return DeclPtrTy(); 2216 2217 // If this has an identifier and is not an invalid redeclaration or 2218 // function template specialization, add it to the scope stack. 2219 if (Name && !(Redeclaration && New->isInvalidDecl())) 2220 PushOnScopeChains(New, S); 2221 2222 return DeclPtrTy::make(New); 2223} 2224 2225/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2226/// types into constant array types in certain situations which would otherwise 2227/// be errors (for GCC compatibility). 2228static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2229 ASTContext &Context, 2230 bool &SizeIsNegative) { 2231 // This method tries to turn a variable array into a constant 2232 // array even when the size isn't an ICE. This is necessary 2233 // for compatibility with code that depends on gcc's buggy 2234 // constant expression folding, like struct {char x[(int)(char*)2];} 2235 SizeIsNegative = false; 2236 2237 QualifierCollector Qs; 2238 const Type *Ty = Qs.strip(T); 2239 2240 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2241 QualType Pointee = PTy->getPointeeType(); 2242 QualType FixedType = 2243 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 2244 if (FixedType.isNull()) return FixedType; 2245 FixedType = Context.getPointerType(FixedType); 2246 return Qs.apply(FixedType); 2247 } 2248 2249 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2250 if (!VLATy) 2251 return QualType(); 2252 // FIXME: We should probably handle this case 2253 if (VLATy->getElementType()->isVariablyModifiedType()) 2254 return QualType(); 2255 2256 Expr::EvalResult EvalResult; 2257 if (!VLATy->getSizeExpr() || 2258 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2259 !EvalResult.Val.isInt()) 2260 return QualType(); 2261 2262 llvm::APSInt &Res = EvalResult.Val.getInt(); 2263 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 2264 // TODO: preserve the size expression in declarator info 2265 return Context.getConstantArrayType(VLATy->getElementType(), 2266 Res, ArrayType::Normal, 0); 2267 } 2268 2269 SizeIsNegative = true; 2270 return QualType(); 2271} 2272 2273/// \brief Register the given locally-scoped external C declaration so 2274/// that it can be found later for redeclarations 2275void 2276Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2277 const LookupResult &Previous, 2278 Scope *S) { 2279 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2280 "Decl is not a locally-scoped decl!"); 2281 // Note that we have a locally-scoped external with this name. 2282 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2283 2284 if (!Previous.isSingleResult()) 2285 return; 2286 2287 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2288 2289 // If there was a previous declaration of this variable, it may be 2290 // in our identifier chain. Update the identifier chain with the new 2291 // declaration. 2292 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2293 // The previous declaration was found on the identifer resolver 2294 // chain, so remove it from its scope. 2295 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 2296 S = S->getParent(); 2297 2298 if (S) 2299 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 2300 } 2301} 2302 2303/// \brief Diagnose function specifiers on a declaration of an identifier that 2304/// does not identify a function. 2305void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2306 // FIXME: We should probably indicate the identifier in question to avoid 2307 // confusion for constructs like "inline int a(), b;" 2308 if (D.getDeclSpec().isInlineSpecified()) 2309 Diag(D.getDeclSpec().getInlineSpecLoc(), 2310 diag::err_inline_non_function); 2311 2312 if (D.getDeclSpec().isVirtualSpecified()) 2313 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2314 diag::err_virtual_non_function); 2315 2316 if (D.getDeclSpec().isExplicitSpecified()) 2317 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2318 diag::err_explicit_non_function); 2319} 2320 2321NamedDecl* 2322Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2323 QualType R, TypeSourceInfo *TInfo, 2324 LookupResult &Previous, bool &Redeclaration) { 2325 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2326 if (D.getCXXScopeSpec().isSet()) { 2327 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2328 << D.getCXXScopeSpec().getRange(); 2329 D.setInvalidType(); 2330 // Pretend we didn't see the scope specifier. 2331 DC = CurContext; 2332 Previous.clear(); 2333 } 2334 2335 if (getLangOptions().CPlusPlus) { 2336 // Check that there are no default arguments (C++ only). 2337 CheckExtraCXXDefaultArguments(D); 2338 } 2339 2340 DiagnoseFunctionSpecifiers(D); 2341 2342 if (D.getDeclSpec().isThreadSpecified()) 2343 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2344 2345 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2346 if (!NewTD) return 0; 2347 2348 // Handle attributes prior to checking for duplicates in MergeVarDecl 2349 ProcessDeclAttributes(S, NewTD, D); 2350 2351 // Merge the decl with the existing one if appropriate. If the decl is 2352 // in an outer scope, it isn't the same thing. 2353 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2354 if (!Previous.empty()) { 2355 Redeclaration = true; 2356 MergeTypeDefDecl(NewTD, Previous); 2357 } 2358 2359 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2360 // then it shall have block scope. 2361 QualType T = NewTD->getUnderlyingType(); 2362 if (T->isVariablyModifiedType()) { 2363 FunctionNeedsScopeChecking() = true; 2364 2365 if (S->getFnParent() == 0) { 2366 bool SizeIsNegative; 2367 QualType FixedTy = 2368 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2369 if (!FixedTy.isNull()) { 2370 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2371 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2372 } else { 2373 if (SizeIsNegative) 2374 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2375 else if (T->isVariableArrayType()) 2376 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2377 else 2378 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2379 NewTD->setInvalidDecl(); 2380 } 2381 } 2382 } 2383 2384 // If this is the C FILE type, notify the AST context. 2385 if (IdentifierInfo *II = NewTD->getIdentifier()) 2386 if (!NewTD->isInvalidDecl() && 2387 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 2388 if (II->isStr("FILE")) 2389 Context.setFILEDecl(NewTD); 2390 else if (II->isStr("jmp_buf")) 2391 Context.setjmp_bufDecl(NewTD); 2392 else if (II->isStr("sigjmp_buf")) 2393 Context.setsigjmp_bufDecl(NewTD); 2394 } 2395 2396 return NewTD; 2397} 2398 2399/// \brief Determines whether the given declaration is an out-of-scope 2400/// previous declaration. 2401/// 2402/// This routine should be invoked when name lookup has found a 2403/// previous declaration (PrevDecl) that is not in the scope where a 2404/// new declaration by the same name is being introduced. If the new 2405/// declaration occurs in a local scope, previous declarations with 2406/// linkage may still be considered previous declarations (C99 2407/// 6.2.2p4-5, C++ [basic.link]p6). 2408/// 2409/// \param PrevDecl the previous declaration found by name 2410/// lookup 2411/// 2412/// \param DC the context in which the new declaration is being 2413/// declared. 2414/// 2415/// \returns true if PrevDecl is an out-of-scope previous declaration 2416/// for a new delcaration with the same name. 2417static bool 2418isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2419 ASTContext &Context) { 2420 if (!PrevDecl) 2421 return 0; 2422 2423 if (!PrevDecl->hasLinkage()) 2424 return false; 2425 2426 if (Context.getLangOptions().CPlusPlus) { 2427 // C++ [basic.link]p6: 2428 // If there is a visible declaration of an entity with linkage 2429 // having the same name and type, ignoring entities declared 2430 // outside the innermost enclosing namespace scope, the block 2431 // scope declaration declares that same entity and receives the 2432 // linkage of the previous declaration. 2433 DeclContext *OuterContext = DC->getLookupContext(); 2434 if (!OuterContext->isFunctionOrMethod()) 2435 // This rule only applies to block-scope declarations. 2436 return false; 2437 else { 2438 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2439 if (PrevOuterContext->isRecord()) 2440 // We found a member function: ignore it. 2441 return false; 2442 else { 2443 // Find the innermost enclosing namespace for the new and 2444 // previous declarations. 2445 while (!OuterContext->isFileContext()) 2446 OuterContext = OuterContext->getParent(); 2447 while (!PrevOuterContext->isFileContext()) 2448 PrevOuterContext = PrevOuterContext->getParent(); 2449 2450 // The previous declaration is in a different namespace, so it 2451 // isn't the same function. 2452 if (OuterContext->getPrimaryContext() != 2453 PrevOuterContext->getPrimaryContext()) 2454 return false; 2455 } 2456 } 2457 } 2458 2459 return true; 2460} 2461 2462static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 2463 CXXScopeSpec &SS = D.getCXXScopeSpec(); 2464 if (!SS.isSet()) return; 2465 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()), 2466 SS.getRange()); 2467} 2468 2469NamedDecl* 2470Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2471 QualType R, TypeSourceInfo *TInfo, 2472 LookupResult &Previous, 2473 MultiTemplateParamsArg TemplateParamLists, 2474 bool &Redeclaration) { 2475 DeclarationName Name = GetNameForDeclarator(D); 2476 2477 // Check that there are no default arguments (C++ only). 2478 if (getLangOptions().CPlusPlus) 2479 CheckExtraCXXDefaultArguments(D); 2480 2481 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 2482 assert(SCSpec != DeclSpec::SCS_typedef && 2483 "Parser allowed 'typedef' as storage class VarDecl."); 2484 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec, 0); 2485 if (SCSpec == DeclSpec::SCS_mutable) { 2486 // mutable can only appear on non-static class members, so it's always 2487 // an error here 2488 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2489 D.setInvalidType(); 2490 SC = VarDecl::None; 2491 } 2492 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 2493 VarDecl::StorageClass SCAsWritten 2494 = StorageClassSpecToVarDeclStorageClass(SCSpec, DC); 2495 2496 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2497 if (!II) { 2498 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2499 << Name.getAsString(); 2500 return 0; 2501 } 2502 2503 DiagnoseFunctionSpecifiers(D); 2504 2505 if (!DC->isRecord() && S->getFnParent() == 0) { 2506 // C99 6.9p2: The storage-class specifiers auto and register shall not 2507 // appear in the declaration specifiers in an external declaration. 2508 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 2509 2510 // If this is a register variable with an asm label specified, then this 2511 // is a GNU extension. 2512 if (SC == VarDecl::Register && D.getAsmLabel()) 2513 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2514 else 2515 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2516 D.setInvalidType(); 2517 } 2518 } 2519 if (DC->isRecord() && !CurContext->isRecord()) { 2520 // This is an out-of-line definition of a static data member. 2521 if (SC == VarDecl::Static) { 2522 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2523 diag::err_static_out_of_line) 2524 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2525 } else if (SC == VarDecl::None) 2526 SC = VarDecl::Static; 2527 } 2528 if (SC == VarDecl::Static) { 2529 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2530 if (RD->isLocalClass()) 2531 Diag(D.getIdentifierLoc(), 2532 diag::err_static_data_member_not_allowed_in_local_class) 2533 << Name << RD->getDeclName(); 2534 } 2535 } 2536 2537 // Match up the template parameter lists with the scope specifier, then 2538 // determine whether we have a template or a template specialization. 2539 bool isExplicitSpecialization = false; 2540 if (TemplateParameterList *TemplateParams 2541 = MatchTemplateParametersToScopeSpecifier( 2542 D.getDeclSpec().getSourceRange().getBegin(), 2543 D.getCXXScopeSpec(), 2544 (TemplateParameterList**)TemplateParamLists.get(), 2545 TemplateParamLists.size(), 2546 /*never a friend*/ false, 2547 isExplicitSpecialization)) { 2548 if (TemplateParams->size() > 0) { 2549 // There is no such thing as a variable template. 2550 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2551 << II 2552 << SourceRange(TemplateParams->getTemplateLoc(), 2553 TemplateParams->getRAngleLoc()); 2554 return 0; 2555 } else { 2556 // There is an extraneous 'template<>' for this variable. Complain 2557 // about it, but allow the declaration of the variable. 2558 Diag(TemplateParams->getTemplateLoc(), 2559 diag::err_template_variable_noparams) 2560 << II 2561 << SourceRange(TemplateParams->getTemplateLoc(), 2562 TemplateParams->getRAngleLoc()); 2563 2564 isExplicitSpecialization = true; 2565 } 2566 } 2567 2568 VarDecl *NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2569 II, R, TInfo, SC, SCAsWritten); 2570 2571 if (D.isInvalidType()) 2572 NewVD->setInvalidDecl(); 2573 2574 SetNestedNameSpecifier(NewVD, D); 2575 2576 if (D.getDeclSpec().isThreadSpecified()) { 2577 if (NewVD->hasLocalStorage()) 2578 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2579 else if (!Context.Target.isTLSSupported()) 2580 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2581 else 2582 NewVD->setThreadSpecified(true); 2583 } 2584 2585 // Set the lexical context. If the declarator has a C++ scope specifier, the 2586 // lexical context will be different from the semantic context. 2587 NewVD->setLexicalDeclContext(CurContext); 2588 2589 // Handle attributes prior to checking for duplicates in MergeVarDecl 2590 ProcessDeclAttributes(S, NewVD, D); 2591 2592 // Handle GNU asm-label extension (encoded as an attribute). 2593 if (Expr *E = (Expr*) D.getAsmLabel()) { 2594 // The parser guarantees this is a string. 2595 StringLiteral *SE = cast<StringLiteral>(E); 2596 NewVD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 2597 } 2598 2599 // Diagnose shadowed variables before filtering for scope. 2600 if (!D.getCXXScopeSpec().isSet()) 2601 CheckShadow(S, NewVD, Previous); 2602 2603 // Don't consider existing declarations that are in a different 2604 // scope and are out-of-semantic-context declarations (if the new 2605 // declaration has linkage). 2606 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2607 2608 // Merge the decl with the existing one if appropriate. 2609 if (!Previous.empty()) { 2610 if (Previous.isSingleResult() && 2611 isa<FieldDecl>(Previous.getFoundDecl()) && 2612 D.getCXXScopeSpec().isSet()) { 2613 // The user tried to define a non-static data member 2614 // out-of-line (C++ [dcl.meaning]p1). 2615 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2616 << D.getCXXScopeSpec().getRange(); 2617 Previous.clear(); 2618 NewVD->setInvalidDecl(); 2619 } 2620 } else if (D.getCXXScopeSpec().isSet()) { 2621 // No previous declaration in the qualifying scope. 2622 Diag(D.getIdentifierLoc(), diag::err_no_member) 2623 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2624 << D.getCXXScopeSpec().getRange(); 2625 NewVD->setInvalidDecl(); 2626 } 2627 2628 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2629 2630 // This is an explicit specialization of a static data member. Check it. 2631 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2632 CheckMemberSpecialization(NewVD, Previous)) 2633 NewVD->setInvalidDecl(); 2634 2635 // attributes declared post-definition are currently ignored 2636 if (Previous.isSingleResult()) { 2637 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2638 if (Def && (Def = Def->getDefinition()) && 2639 Def != NewVD && D.hasAttributes()) { 2640 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2641 Diag(Def->getLocation(), diag::note_previous_definition); 2642 } 2643 } 2644 2645 // If this is a locally-scoped extern C variable, update the map of 2646 // such variables. 2647 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2648 !NewVD->isInvalidDecl()) 2649 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2650 2651 return NewVD; 2652} 2653 2654/// \brief Diagnose variable or built-in function shadowing. Implements 2655/// -Wshadow. 2656/// 2657/// This method is called whenever a VarDecl is added to a "useful" 2658/// scope. 2659/// 2660/// \param S the scope in which the shadowing name is being declared 2661/// \param R the lookup of the name 2662/// 2663void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 2664 // Return if warning is ignored. 2665 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow) == Diagnostic::Ignored) 2666 return; 2667 2668 // Don't diagnose declarations at file scope. The scope might not 2669 // have a DeclContext if (e.g.) we're parsing a function prototype. 2670 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity()); 2671 if (NewDC && NewDC->isFileContext()) 2672 return; 2673 2674 // Only diagnose if we're shadowing an unambiguous field or variable. 2675 if (R.getResultKind() != LookupResult::Found) 2676 return; 2677 2678 NamedDecl* ShadowedDecl = R.getFoundDecl(); 2679 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 2680 return; 2681 2682 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 2683 2684 // Only warn about certain kinds of shadowing for class members. 2685 if (NewDC && NewDC->isRecord()) { 2686 // In particular, don't warn about shadowing non-class members. 2687 if (!OldDC->isRecord()) 2688 return; 2689 2690 // TODO: should we warn about static data members shadowing 2691 // static data members from base classes? 2692 2693 // TODO: don't diagnose for inaccessible shadowed members. 2694 // This is hard to do perfectly because we might friend the 2695 // shadowing context, but that's just a false negative. 2696 } 2697 2698 // Determine what kind of declaration we're shadowing. 2699 unsigned Kind; 2700 if (isa<RecordDecl>(OldDC)) { 2701 if (isa<FieldDecl>(ShadowedDecl)) 2702 Kind = 3; // field 2703 else 2704 Kind = 2; // static data member 2705 } else if (OldDC->isFileContext()) 2706 Kind = 1; // global 2707 else 2708 Kind = 0; // local 2709 2710 DeclarationName Name = R.getLookupName(); 2711 2712 // Emit warning and note. 2713 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 2714 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 2715} 2716 2717/// \brief Check -Wshadow without the advantage of a previous lookup. 2718void Sema::CheckShadow(Scope *S, VarDecl *D) { 2719 LookupResult R(*this, D->getDeclName(), D->getLocation(), 2720 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 2721 LookupName(R, S); 2722 CheckShadow(S, D, R); 2723} 2724 2725/// \brief Perform semantic checking on a newly-created variable 2726/// declaration. 2727/// 2728/// This routine performs all of the type-checking required for a 2729/// variable declaration once it has been built. It is used both to 2730/// check variables after they have been parsed and their declarators 2731/// have been translated into a declaration, and to check variables 2732/// that have been instantiated from a template. 2733/// 2734/// Sets NewVD->isInvalidDecl() if an error was encountered. 2735void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2736 LookupResult &Previous, 2737 bool &Redeclaration) { 2738 // If the decl is already known invalid, don't check it. 2739 if (NewVD->isInvalidDecl()) 2740 return; 2741 2742 QualType T = NewVD->getType(); 2743 2744 if (T->isObjCObjectType()) { 2745 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2746 return NewVD->setInvalidDecl(); 2747 } 2748 2749 // Emit an error if an address space was applied to decl with local storage. 2750 // This includes arrays of objects with address space qualifiers, but not 2751 // automatic variables that point to other address spaces. 2752 // ISO/IEC TR 18037 S5.1.2 2753 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2754 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2755 return NewVD->setInvalidDecl(); 2756 } 2757 2758 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2759 && !NewVD->hasAttr<BlocksAttr>()) 2760 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2761 2762 bool isVM = T->isVariablyModifiedType(); 2763 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2764 NewVD->hasAttr<BlocksAttr>() || 2765 // FIXME: We need to diagnose jumps passed initialized variables in C++. 2766 // However, this turns on the scope checker for everything with a variable 2767 // which may impact compile time. See if we can find a better solution 2768 // to this, perhaps only checking functions that contain gotos in C++? 2769 (LangOpts.CPlusPlus && NewVD->hasLocalStorage())) 2770 FunctionNeedsScopeChecking() = true; 2771 2772 if ((isVM && NewVD->hasLinkage()) || 2773 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2774 bool SizeIsNegative; 2775 QualType FixedTy = 2776 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2777 2778 if (FixedTy.isNull() && T->isVariableArrayType()) { 2779 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2780 // FIXME: This won't give the correct result for 2781 // int a[10][n]; 2782 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2783 2784 if (NewVD->isFileVarDecl()) 2785 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2786 << SizeRange; 2787 else if (NewVD->getStorageClass() == VarDecl::Static) 2788 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2789 << SizeRange; 2790 else 2791 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2792 << SizeRange; 2793 return NewVD->setInvalidDecl(); 2794 } 2795 2796 if (FixedTy.isNull()) { 2797 if (NewVD->isFileVarDecl()) 2798 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2799 else 2800 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2801 return NewVD->setInvalidDecl(); 2802 } 2803 2804 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2805 NewVD->setType(FixedTy); 2806 } 2807 2808 if (Previous.empty() && NewVD->isExternC()) { 2809 // Since we did not find anything by this name and we're declaring 2810 // an extern "C" variable, look for a non-visible extern "C" 2811 // declaration with the same name. 2812 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2813 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2814 if (Pos != LocallyScopedExternalDecls.end()) 2815 Previous.addDecl(Pos->second); 2816 } 2817 2818 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2819 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2820 << T; 2821 return NewVD->setInvalidDecl(); 2822 } 2823 2824 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2825 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2826 return NewVD->setInvalidDecl(); 2827 } 2828 2829 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2830 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2831 return NewVD->setInvalidDecl(); 2832 } 2833 2834 if (!Previous.empty()) { 2835 Redeclaration = true; 2836 MergeVarDecl(NewVD, Previous); 2837 } 2838} 2839 2840/// \brief Data used with FindOverriddenMethod 2841struct FindOverriddenMethodData { 2842 Sema *S; 2843 CXXMethodDecl *Method; 2844}; 2845 2846/// \brief Member lookup function that determines whether a given C++ 2847/// method overrides a method in a base class, to be used with 2848/// CXXRecordDecl::lookupInBases(). 2849static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 2850 CXXBasePath &Path, 2851 void *UserData) { 2852 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2853 2854 FindOverriddenMethodData *Data 2855 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 2856 2857 DeclarationName Name = Data->Method->getDeclName(); 2858 2859 // FIXME: Do we care about other names here too? 2860 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2861 // We really want to find the base class constructor here. 2862 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 2863 CanQualType CT = Data->S->Context.getCanonicalType(T); 2864 2865 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 2866 } 2867 2868 for (Path.Decls = BaseRecord->lookup(Name); 2869 Path.Decls.first != Path.Decls.second; 2870 ++Path.Decls.first) { 2871 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*Path.Decls.first)) { 2872 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD)) 2873 return true; 2874 } 2875 } 2876 2877 return false; 2878} 2879 2880/// AddOverriddenMethods - See if a method overrides any in the base classes, 2881/// and if so, check that it's a valid override and remember it. 2882void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2883 // Look for virtual methods in base classes that this method might override. 2884 CXXBasePaths Paths; 2885 FindOverriddenMethodData Data; 2886 Data.Method = MD; 2887 Data.S = this; 2888 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 2889 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 2890 E = Paths.found_decls_end(); I != E; ++I) { 2891 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2892 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 2893 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 2894 !CheckOverridingFunctionAttributes(MD, OldMD)) 2895 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 2896 } 2897 } 2898 } 2899} 2900 2901NamedDecl* 2902Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2903 QualType R, TypeSourceInfo *TInfo, 2904 LookupResult &Previous, 2905 MultiTemplateParamsArg TemplateParamLists, 2906 bool IsFunctionDefinition, bool &Redeclaration) { 2907 assert(R.getTypePtr()->isFunctionType()); 2908 2909 DeclarationName Name = GetNameForDeclarator(D); 2910 FunctionDecl::StorageClass SC = FunctionDecl::None; 2911 switch (D.getDeclSpec().getStorageClassSpec()) { 2912 default: assert(0 && "Unknown storage class!"); 2913 case DeclSpec::SCS_auto: 2914 case DeclSpec::SCS_register: 2915 case DeclSpec::SCS_mutable: 2916 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2917 diag::err_typecheck_sclass_func); 2918 D.setInvalidType(); 2919 break; 2920 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2921 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2922 case DeclSpec::SCS_static: { 2923 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2924 // C99 6.7.1p5: 2925 // The declaration of an identifier for a function that has 2926 // block scope shall have no explicit storage-class specifier 2927 // other than extern 2928 // See also (C++ [dcl.stc]p4). 2929 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2930 diag::err_static_block_func); 2931 SC = FunctionDecl::None; 2932 } else 2933 SC = FunctionDecl::Static; 2934 break; 2935 } 2936 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2937 } 2938 2939 if (D.getDeclSpec().isThreadSpecified()) 2940 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2941 2942 bool isFriend = D.getDeclSpec().isFriendSpecified(); 2943 bool isInline = D.getDeclSpec().isInlineSpecified(); 2944 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2945 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2946 2947 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 2948 FunctionDecl::StorageClass SCAsWritten 2949 = StorageClassSpecToFunctionDeclStorageClass(SCSpec, DC); 2950 2951 // Check that the return type is not an abstract class type. 2952 // For record types, this is done by the AbstractClassUsageDiagnoser once 2953 // the class has been completely parsed. 2954 if (!DC->isRecord() && 2955 RequireNonAbstractType(D.getIdentifierLoc(), 2956 R->getAs<FunctionType>()->getResultType(), 2957 diag::err_abstract_type_in_decl, 2958 AbstractReturnType)) 2959 D.setInvalidType(); 2960 2961 // Do not allow returning a objc interface by-value. 2962 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 2963 Diag(D.getIdentifierLoc(), 2964 diag::err_object_cannot_be_passed_returned_by_value) << 0 2965 << R->getAs<FunctionType>()->getResultType(); 2966 D.setInvalidType(); 2967 } 2968 2969 bool isVirtualOkay = false; 2970 FunctionDecl *NewFD; 2971 2972 if (isFriend) { 2973 // C++ [class.friend]p5 2974 // A function can be defined in a friend declaration of a 2975 // class . . . . Such a function is implicitly inline. 2976 isInline |= IsFunctionDefinition; 2977 } 2978 2979 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 2980 // This is a C++ constructor declaration. 2981 assert(DC->isRecord() && 2982 "Constructors can only be declared in a member context"); 2983 2984 R = CheckConstructorDeclarator(D, R, SC); 2985 2986 // Create the new declaration 2987 NewFD = CXXConstructorDecl::Create(Context, 2988 cast<CXXRecordDecl>(DC), 2989 D.getIdentifierLoc(), Name, R, TInfo, 2990 isExplicit, isInline, 2991 /*isImplicitlyDeclared=*/false); 2992 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2993 // This is a C++ destructor declaration. 2994 if (DC->isRecord()) { 2995 R = CheckDestructorDeclarator(D, SC); 2996 2997 NewFD = CXXDestructorDecl::Create(Context, 2998 cast<CXXRecordDecl>(DC), 2999 D.getIdentifierLoc(), Name, R, 3000 isInline, 3001 /*isImplicitlyDeclared=*/false); 3002 NewFD->setTypeSourceInfo(TInfo); 3003 3004 isVirtualOkay = true; 3005 } else { 3006 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 3007 3008 // Create a FunctionDecl to satisfy the function definition parsing 3009 // code path. 3010 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 3011 Name, R, TInfo, SC, SCAsWritten, isInline, 3012 /*hasPrototype=*/true); 3013 D.setInvalidType(); 3014 } 3015 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 3016 if (!DC->isRecord()) { 3017 Diag(D.getIdentifierLoc(), 3018 diag::err_conv_function_not_member); 3019 return 0; 3020 } 3021 3022 CheckConversionDeclarator(D, R, SC); 3023 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 3024 D.getIdentifierLoc(), Name, R, TInfo, 3025 isInline, isExplicit); 3026 3027 isVirtualOkay = true; 3028 } else if (DC->isRecord()) { 3029 // If the of the function is the same as the name of the record, then this 3030 // must be an invalid constructor that has a return type. 3031 // (The parser checks for a return type and makes the declarator a 3032 // constructor if it has no return type). 3033 // must have an invalid constructor that has a return type 3034 if (Name.getAsIdentifierInfo() && 3035 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 3036 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 3037 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3038 << SourceRange(D.getIdentifierLoc()); 3039 return 0; 3040 } 3041 3042 bool isStatic = SC == FunctionDecl::Static; 3043 3044 // [class.free]p1: 3045 // Any allocation function for a class T is a static member 3046 // (even if not explicitly declared static). 3047 if (Name.getCXXOverloadedOperator() == OO_New || 3048 Name.getCXXOverloadedOperator() == OO_Array_New) 3049 isStatic = true; 3050 3051 // [class.free]p6 Any deallocation function for a class X is a static member 3052 // (even if not explicitly declared static). 3053 if (Name.getCXXOverloadedOperator() == OO_Delete || 3054 Name.getCXXOverloadedOperator() == OO_Array_Delete) 3055 isStatic = true; 3056 3057 // This is a C++ method declaration. 3058 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 3059 D.getIdentifierLoc(), Name, R, TInfo, 3060 isStatic, SCAsWritten, isInline); 3061 3062 isVirtualOkay = !isStatic; 3063 } else { 3064 // Determine whether the function was written with a 3065 // prototype. This true when: 3066 // - we're in C++ (where every function has a prototype), 3067 // - there is a prototype in the declarator, or 3068 // - the type R of the function is some kind of typedef or other reference 3069 // to a type name (which eventually refers to a function type). 3070 bool HasPrototype = 3071 getLangOptions().CPlusPlus || 3072 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 3073 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 3074 3075 NewFD = FunctionDecl::Create(Context, DC, 3076 D.getIdentifierLoc(), 3077 Name, R, TInfo, SC, SCAsWritten, isInline, 3078 HasPrototype); 3079 } 3080 3081 if (D.isInvalidType()) 3082 NewFD->setInvalidDecl(); 3083 3084 SetNestedNameSpecifier(NewFD, D); 3085 3086 // Set the lexical context. If the declarator has a C++ 3087 // scope specifier, or is the object of a friend declaration, the 3088 // lexical context will be different from the semantic context. 3089 NewFD->setLexicalDeclContext(CurContext); 3090 3091 // Match up the template parameter lists with the scope specifier, then 3092 // determine whether we have a template or a template specialization. 3093 FunctionTemplateDecl *FunctionTemplate = 0; 3094 bool isExplicitSpecialization = false; 3095 bool isFunctionTemplateSpecialization = false; 3096 if (TemplateParameterList *TemplateParams 3097 = MatchTemplateParametersToScopeSpecifier( 3098 D.getDeclSpec().getSourceRange().getBegin(), 3099 D.getCXXScopeSpec(), 3100 (TemplateParameterList**)TemplateParamLists.get(), 3101 TemplateParamLists.size(), 3102 isFriend, 3103 isExplicitSpecialization)) { 3104 if (TemplateParams->size() > 0) { 3105 // This is a function template 3106 3107 // Check that we can declare a template here. 3108 if (CheckTemplateDeclScope(S, TemplateParams)) 3109 return 0; 3110 3111 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 3112 NewFD->getLocation(), 3113 Name, TemplateParams, 3114 NewFD); 3115 FunctionTemplate->setLexicalDeclContext(CurContext); 3116 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 3117 } else { 3118 // This is a function template specialization. 3119 isFunctionTemplateSpecialization = true; 3120 3121 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 3122 if (isFriend && isFunctionTemplateSpecialization) { 3123 // We want to remove the "template<>", found here. 3124 SourceRange RemoveRange = TemplateParams->getSourceRange(); 3125 3126 // If we remove the template<> and the name is not a 3127 // template-id, we're actually silently creating a problem: 3128 // the friend declaration will refer to an untemplated decl, 3129 // and clearly the user wants a template specialization. So 3130 // we need to insert '<>' after the name. 3131 SourceLocation InsertLoc; 3132 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 3133 InsertLoc = D.getName().getSourceRange().getEnd(); 3134 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 3135 } 3136 3137 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 3138 << Name << RemoveRange 3139 << FixItHint::CreateRemoval(RemoveRange) 3140 << FixItHint::CreateInsertion(InsertLoc, "<>"); 3141 } 3142 } 3143 3144 // FIXME: Free this memory properly. 3145 TemplateParamLists.release(); 3146 } 3147 3148 // C++ [dcl.fct.spec]p5: 3149 // The virtual specifier shall only be used in declarations of 3150 // nonstatic class member functions that appear within a 3151 // member-specification of a class declaration; see 10.3. 3152 // 3153 if (isVirtual && !NewFD->isInvalidDecl()) { 3154 if (!isVirtualOkay) { 3155 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3156 diag::err_virtual_non_function); 3157 } else if (!CurContext->isRecord()) { 3158 // 'virtual' was specified outside of the class. 3159 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 3160 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 3161 } else { 3162 // Okay: Add virtual to the method. 3163 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 3164 CurClass->setMethodAsVirtual(NewFD); 3165 } 3166 } 3167 3168 // C++ [dcl.fct.spec]p6: 3169 // The explicit specifier shall be used only in the declaration of a 3170 // constructor or conversion function within its class definition; see 12.3.1 3171 // and 12.3.2. 3172 if (isExplicit && !NewFD->isInvalidDecl()) { 3173 if (!CurContext->isRecord()) { 3174 // 'explicit' was specified outside of the class. 3175 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3176 diag::err_explicit_out_of_class) 3177 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3178 } else if (!isa<CXXConstructorDecl>(NewFD) && 3179 !isa<CXXConversionDecl>(NewFD)) { 3180 // 'explicit' was specified on a function that wasn't a constructor 3181 // or conversion function. 3182 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3183 diag::err_explicit_non_ctor_or_conv_function) 3184 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3185 } 3186 } 3187 3188 // Filter out previous declarations that don't match the scope. 3189 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3190 3191 if (isFriend) { 3192 // DC is the namespace in which the function is being declared. 3193 assert((DC->isFileContext() || !Previous.empty()) && 3194 "previously-undeclared friend function being created " 3195 "in a non-namespace context"); 3196 3197 // For now, claim that the objects have no previous declaration. 3198 if (FunctionTemplate) { 3199 FunctionTemplate->setObjectOfFriendDecl(false); 3200 FunctionTemplate->setAccess(AS_public); 3201 } 3202 NewFD->setObjectOfFriendDecl(false); 3203 NewFD->setAccess(AS_public); 3204 } 3205 3206 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 3207 !CurContext->isRecord()) { 3208 // C++ [class.static]p1: 3209 // A data or function member of a class may be declared static 3210 // in a class definition, in which case it is a static member of 3211 // the class. 3212 3213 // Complain about the 'static' specifier if it's on an out-of-line 3214 // member function definition. 3215 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3216 diag::err_static_out_of_line) 3217 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3218 } 3219 3220 // Handle GNU asm-label extension (encoded as an attribute). 3221 if (Expr *E = (Expr*) D.getAsmLabel()) { 3222 // The parser guarantees this is a string. 3223 StringLiteral *SE = cast<StringLiteral>(E); 3224 NewFD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 3225 } 3226 3227 // Copy the parameter declarations from the declarator D to the function 3228 // declaration NewFD, if they are available. First scavenge them into Params. 3229 llvm::SmallVector<ParmVarDecl*, 16> Params; 3230 if (D.getNumTypeObjects() > 0) { 3231 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3232 3233 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 3234 // function that takes no arguments, not a function that takes a 3235 // single void argument. 3236 // We let through "const void" here because Sema::GetTypeForDeclarator 3237 // already checks for that case. 3238 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3239 FTI.ArgInfo[0].Param && 3240 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 3241 // Empty arg list, don't push any params. 3242 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 3243 3244 // In C++, the empty parameter-type-list must be spelled "void"; a 3245 // typedef of void is not permitted. 3246 if (getLangOptions().CPlusPlus && 3247 Param->getType().getUnqualifiedType() != Context.VoidTy) 3248 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 3249 // FIXME: Leaks decl? 3250 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 3251 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 3252 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 3253 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 3254 Param->setDeclContext(NewFD); 3255 Params.push_back(Param); 3256 3257 if (Param->isInvalidDecl()) 3258 NewFD->setInvalidDecl(); 3259 } 3260 } 3261 3262 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 3263 // When we're declaring a function with a typedef, typeof, etc as in the 3264 // following example, we'll need to synthesize (unnamed) 3265 // parameters for use in the declaration. 3266 // 3267 // @code 3268 // typedef void fn(int); 3269 // fn f; 3270 // @endcode 3271 3272 // Synthesize a parameter for each argument type. 3273 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3274 AE = FT->arg_type_end(); AI != AE; ++AI) { 3275 ParmVarDecl *Param = ParmVarDecl::Create(Context, NewFD, 3276 D.getIdentifierLoc(), 0, 3277 *AI, 3278 Context.getTrivialTypeSourceInfo(*AI, 3279 D.getIdentifierLoc()), 3280 VarDecl::None, 3281 VarDecl::None, 0); 3282 Param->setImplicit(); 3283 Params.push_back(Param); 3284 } 3285 } else { 3286 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 3287 "Should not need args for typedef of non-prototype fn"); 3288 } 3289 // Finally, we know we have the right number of parameters, install them. 3290 NewFD->setParams(Params.data(), Params.size()); 3291 3292 // If the declarator is a template-id, translate the parser's template 3293 // argument list into our AST format. 3294 bool HasExplicitTemplateArgs = false; 3295 TemplateArgumentListInfo TemplateArgs; 3296 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3297 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3298 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3299 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3300 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3301 TemplateId->getTemplateArgs(), 3302 TemplateId->NumArgs); 3303 translateTemplateArguments(TemplateArgsPtr, 3304 TemplateArgs); 3305 TemplateArgsPtr.release(); 3306 3307 HasExplicitTemplateArgs = true; 3308 3309 if (FunctionTemplate) { 3310 // FIXME: Diagnose function template with explicit template 3311 // arguments. 3312 HasExplicitTemplateArgs = false; 3313 } else if (!isFunctionTemplateSpecialization && 3314 !D.getDeclSpec().isFriendSpecified()) { 3315 // We have encountered something that the user meant to be a 3316 // specialization (because it has explicitly-specified template 3317 // arguments) but that was not introduced with a "template<>" (or had 3318 // too few of them). 3319 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3320 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3321 << FixItHint::CreateInsertion( 3322 D.getDeclSpec().getSourceRange().getBegin(), 3323 "template<> "); 3324 isFunctionTemplateSpecialization = true; 3325 } else { 3326 // "friend void foo<>(int);" is an implicit specialization decl. 3327 isFunctionTemplateSpecialization = true; 3328 } 3329 } else if (isFriend && isFunctionTemplateSpecialization) { 3330 // This combination is only possible in a recovery case; the user 3331 // wrote something like: 3332 // template <> friend void foo(int); 3333 // which we're recovering from as if the user had written: 3334 // friend void foo<>(int); 3335 // Go ahead and fake up a template id. 3336 HasExplicitTemplateArgs = true; 3337 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 3338 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 3339 } 3340 3341 // If it's a friend (and only if it's a friend), it's possible 3342 // that either the specialized function type or the specialized 3343 // template is dependent, and therefore matching will fail. In 3344 // this case, don't check the specialization yet. 3345 if (isFunctionTemplateSpecialization && isFriend && 3346 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 3347 assert(HasExplicitTemplateArgs && 3348 "friend function specialization without template args"); 3349 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 3350 Previous)) 3351 NewFD->setInvalidDecl(); 3352 } else if (isFunctionTemplateSpecialization) { 3353 if (CheckFunctionTemplateSpecialization(NewFD, 3354 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3355 Previous)) 3356 NewFD->setInvalidDecl(); 3357 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 3358 if (CheckMemberSpecialization(NewFD, Previous)) 3359 NewFD->setInvalidDecl(); 3360 } 3361 3362 // Perform semantic checking on the function declaration. 3363 bool OverloadableAttrRequired = false; // FIXME: HACK! 3364 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3365 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 3366 3367 assert((NewFD->isInvalidDecl() || !Redeclaration || 3368 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3369 "previous declaration set still overloaded"); 3370 3371 NamedDecl *PrincipalDecl = (FunctionTemplate 3372 ? cast<NamedDecl>(FunctionTemplate) 3373 : NewFD); 3374 3375 if (isFriend && Redeclaration) { 3376 AccessSpecifier Access = AS_public; 3377 if (!NewFD->isInvalidDecl()) 3378 Access = NewFD->getPreviousDeclaration()->getAccess(); 3379 3380 NewFD->setAccess(Access); 3381 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 3382 3383 PrincipalDecl->setObjectOfFriendDecl(true); 3384 } 3385 3386 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 3387 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 3388 PrincipalDecl->setNonMemberOperator(); 3389 3390 // If we have a function template, check the template parameter 3391 // list. This will check and merge default template arguments. 3392 if (FunctionTemplate) { 3393 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3394 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3395 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3396 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3397 : TPC_FunctionTemplate); 3398 } 3399 3400 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 3401 // Fake up an access specifier if it's supposed to be a class member. 3402 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext())) 3403 NewFD->setAccess(AS_public); 3404 3405 // An out-of-line member function declaration must also be a 3406 // definition (C++ [dcl.meaning]p1). 3407 // Note that this is not the case for explicit specializations of 3408 // function templates or member functions of class templates, per 3409 // C++ [temp.expl.spec]p2. 3410 if (!IsFunctionDefinition && !isFriend && 3411 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 3412 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 3413 << D.getCXXScopeSpec().getRange(); 3414 NewFD->setInvalidDecl(); 3415 } else if (!Redeclaration && 3416 !(isFriend && CurContext->isDependentContext())) { 3417 // The user tried to provide an out-of-line definition for a 3418 // function that is a member of a class or namespace, but there 3419 // was no such member function declared (C++ [class.mfct]p2, 3420 // C++ [namespace.memdef]p2). For example: 3421 // 3422 // class X { 3423 // void f() const; 3424 // }; 3425 // 3426 // void X::f() { } // ill-formed 3427 // 3428 // Complain about this problem, and attempt to suggest close 3429 // matches (e.g., those that differ only in cv-qualifiers and 3430 // whether the parameter types are references). 3431 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3432 << Name << DC << D.getCXXScopeSpec().getRange(); 3433 NewFD->setInvalidDecl(); 3434 3435 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 3436 ForRedeclaration); 3437 LookupQualifiedName(Prev, DC); 3438 assert(!Prev.isAmbiguous() && 3439 "Cannot have an ambiguity in previous-declaration lookup"); 3440 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3441 Func != FuncEnd; ++Func) { 3442 if (isa<FunctionDecl>(*Func) && 3443 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 3444 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3445 } 3446 } 3447 } 3448 3449 // Handle attributes. We need to have merged decls when handling attributes 3450 // (for example to check for conflicts, etc). 3451 // FIXME: This needs to happen before we merge declarations. Then, 3452 // let attribute merging cope with attribute conflicts. 3453 ProcessDeclAttributes(S, NewFD, D); 3454 3455 // attributes declared post-definition are currently ignored 3456 if (Redeclaration && Previous.isSingleResult()) { 3457 const FunctionDecl *Def; 3458 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3459 if (PrevFD && PrevFD->getBody(Def) && D.hasAttributes()) { 3460 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3461 Diag(Def->getLocation(), diag::note_previous_definition); 3462 } 3463 } 3464 3465 AddKnownFunctionAttributes(NewFD); 3466 3467 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 3468 // If a function name is overloadable in C, then every function 3469 // with that name must be marked "overloadable". 3470 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3471 << Redeclaration << NewFD; 3472 if (!Previous.empty()) 3473 Diag(Previous.getRepresentativeDecl()->getLocation(), 3474 diag::note_attribute_overloadable_prev_overload); 3475 NewFD->addAttr(::new (Context) OverloadableAttr()); 3476 } 3477 3478 // If this is a locally-scoped extern C function, update the 3479 // map of such names. 3480 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3481 && !NewFD->isInvalidDecl()) 3482 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3483 3484 // Set this FunctionDecl's range up to the right paren. 3485 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3486 3487 if (FunctionTemplate && NewFD->isInvalidDecl()) 3488 FunctionTemplate->setInvalidDecl(); 3489 3490 if (FunctionTemplate) 3491 return FunctionTemplate; 3492 3493 3494 // Keep track of static, non-inlined function definitions that 3495 // have not been used. We will warn later. 3496 // FIXME: Also include static functions declared but not defined. 3497 if (!NewFD->isInvalidDecl() && IsFunctionDefinition 3498 && !NewFD->isInlined() && NewFD->getLinkage() == InternalLinkage 3499 && !NewFD->isUsed() && !NewFD->hasAttr<UnusedAttr>() 3500 && !NewFD->hasAttr<ConstructorAttr>() 3501 && !NewFD->hasAttr<DestructorAttr>()) 3502 UnusedStaticFuncs.push_back(NewFD); 3503 3504 return NewFD; 3505} 3506 3507/// \brief Perform semantic checking of a new function declaration. 3508/// 3509/// Performs semantic analysis of the new function declaration 3510/// NewFD. This routine performs all semantic checking that does not 3511/// require the actual declarator involved in the declaration, and is 3512/// used both for the declaration of functions as they are parsed 3513/// (called via ActOnDeclarator) and for the declaration of functions 3514/// that have been instantiated via C++ template instantiation (called 3515/// via InstantiateDecl). 3516/// 3517/// \param IsExplicitSpecialiation whether this new function declaration is 3518/// an explicit specialization of the previous declaration. 3519/// 3520/// This sets NewFD->isInvalidDecl() to true if there was an error. 3521void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3522 LookupResult &Previous, 3523 bool IsExplicitSpecialization, 3524 bool &Redeclaration, 3525 bool &OverloadableAttrRequired) { 3526 // If NewFD is already known erroneous, don't do any of this checking. 3527 if (NewFD->isInvalidDecl()) 3528 return; 3529 3530 if (NewFD->getResultType()->isVariablyModifiedType()) { 3531 // Functions returning a variably modified type violate C99 6.7.5.2p2 3532 // because all functions have linkage. 3533 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3534 return NewFD->setInvalidDecl(); 3535 } 3536 3537 if (NewFD->isMain()) 3538 CheckMain(NewFD); 3539 3540 // Check for a previous declaration of this name. 3541 if (Previous.empty() && NewFD->isExternC()) { 3542 // Since we did not find anything by this name and we're declaring 3543 // an extern "C" function, look for a non-visible extern "C" 3544 // declaration with the same name. 3545 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3546 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3547 if (Pos != LocallyScopedExternalDecls.end()) 3548 Previous.addDecl(Pos->second); 3549 } 3550 3551 // Merge or overload the declaration with an existing declaration of 3552 // the same name, if appropriate. 3553 if (!Previous.empty()) { 3554 // Determine whether NewFD is an overload of PrevDecl or 3555 // a declaration that requires merging. If it's an overload, 3556 // there's no more work to do here; we'll just add the new 3557 // function to the scope. 3558 3559 NamedDecl *OldDecl = 0; 3560 if (!AllowOverloadingOfFunction(Previous, Context)) { 3561 Redeclaration = true; 3562 OldDecl = Previous.getFoundDecl(); 3563 } else { 3564 if (!getLangOptions().CPlusPlus) { 3565 OverloadableAttrRequired = true; 3566 3567 // Functions marked "overloadable" must have a prototype (that 3568 // we can't get through declaration merging). 3569 if (!NewFD->getType()->getAs<FunctionProtoType>()) { 3570 Diag(NewFD->getLocation(), 3571 diag::err_attribute_overloadable_no_prototype) 3572 << NewFD; 3573 Redeclaration = true; 3574 3575 // Turn this into a variadic function with no parameters. 3576 QualType R = Context.getFunctionType( 3577 NewFD->getType()->getAs<FunctionType>()->getResultType(), 3578 0, 0, true, 0, false, false, 0, 0, 3579 FunctionType::ExtInfo()); 3580 NewFD->setType(R); 3581 return NewFD->setInvalidDecl(); 3582 } 3583 } 3584 3585 switch (CheckOverload(NewFD, Previous, OldDecl)) { 3586 case Ovl_Match: 3587 Redeclaration = true; 3588 if (isa<UsingShadowDecl>(OldDecl) && CurContext->isRecord()) { 3589 HideUsingShadowDecl(S, cast<UsingShadowDecl>(OldDecl)); 3590 Redeclaration = false; 3591 } 3592 break; 3593 3594 case Ovl_NonFunction: 3595 Redeclaration = true; 3596 break; 3597 3598 case Ovl_Overload: 3599 Redeclaration = false; 3600 break; 3601 } 3602 } 3603 3604 if (Redeclaration) { 3605 // NewFD and OldDecl represent declarations that need to be 3606 // merged. 3607 if (MergeFunctionDecl(NewFD, OldDecl)) 3608 return NewFD->setInvalidDecl(); 3609 3610 Previous.clear(); 3611 Previous.addDecl(OldDecl); 3612 3613 if (FunctionTemplateDecl *OldTemplateDecl 3614 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3615 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3616 FunctionTemplateDecl *NewTemplateDecl 3617 = NewFD->getDescribedFunctionTemplate(); 3618 assert(NewTemplateDecl && "Template/non-template mismatch"); 3619 if (CXXMethodDecl *Method 3620 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3621 Method->setAccess(OldTemplateDecl->getAccess()); 3622 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3623 } 3624 3625 // If this is an explicit specialization of a member that is a function 3626 // template, mark it as a member specialization. 3627 if (IsExplicitSpecialization && 3628 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3629 NewTemplateDecl->setMemberSpecialization(); 3630 assert(OldTemplateDecl->isMemberSpecialization()); 3631 } 3632 } else { 3633 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3634 NewFD->setAccess(OldDecl->getAccess()); 3635 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3636 } 3637 } 3638 } 3639 3640 // Semantic checking for this function declaration (in isolation). 3641 if (getLangOptions().CPlusPlus) { 3642 // C++-specific checks. 3643 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3644 CheckConstructor(Constructor); 3645 } else if (CXXDestructorDecl *Destructor = 3646 dyn_cast<CXXDestructorDecl>(NewFD)) { 3647 CXXRecordDecl *Record = Destructor->getParent(); 3648 QualType ClassType = Context.getTypeDeclType(Record); 3649 3650 // FIXME: Shouldn't we be able to perform thisc heck even when the class 3651 // type is dependent? Both gcc and edg can handle that. 3652 if (!ClassType->isDependentType()) { 3653 DeclarationName Name 3654 = Context.DeclarationNames.getCXXDestructorName( 3655 Context.getCanonicalType(ClassType)); 3656 if (NewFD->getDeclName() != Name) { 3657 Diag(NewFD->getLocation(), diag::err_destructor_name); 3658 return NewFD->setInvalidDecl(); 3659 } 3660 } 3661 3662 Record->setUserDeclaredDestructor(true); 3663 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3664 // user-defined destructor. 3665 Record->setPOD(false); 3666 3667 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3668 // declared destructor. 3669 // FIXME: C++0x: don't do this for "= default" destructors 3670 Record->setHasTrivialDestructor(false); 3671 } else if (CXXConversionDecl *Conversion 3672 = dyn_cast<CXXConversionDecl>(NewFD)) { 3673 ActOnConversionDeclarator(Conversion); 3674 } 3675 3676 // Find any virtual functions that this function overrides. 3677 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3678 if (!Method->isFunctionTemplateSpecialization() && 3679 !Method->getDescribedFunctionTemplate()) 3680 AddOverriddenMethods(Method->getParent(), Method); 3681 } 3682 3683 // Additional checks for the destructor; make sure we do this after we 3684 // figure out whether the destructor is virtual. 3685 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(NewFD)) 3686 if (!Destructor->getParent()->isDependentType()) 3687 CheckDestructor(Destructor); 3688 3689 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3690 if (NewFD->isOverloadedOperator() && 3691 CheckOverloadedOperatorDeclaration(NewFD)) 3692 return NewFD->setInvalidDecl(); 3693 3694 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3695 if (NewFD->getLiteralIdentifier() && 3696 CheckLiteralOperatorDeclaration(NewFD)) 3697 return NewFD->setInvalidDecl(); 3698 3699 // In C++, check default arguments now that we have merged decls. Unless 3700 // the lexical context is the class, because in this case this is done 3701 // during delayed parsing anyway. 3702 if (!CurContext->isRecord()) 3703 CheckCXXDefaultArguments(NewFD); 3704 } 3705} 3706 3707void Sema::CheckMain(FunctionDecl* FD) { 3708 // C++ [basic.start.main]p3: A program that declares main to be inline 3709 // or static is ill-formed. 3710 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3711 // shall not appear in a declaration of main. 3712 // static main is not an error under C99, but we should warn about it. 3713 bool isInline = FD->isInlineSpecified(); 3714 bool isStatic = FD->getStorageClass() == FunctionDecl::Static; 3715 if (isInline || isStatic) { 3716 unsigned diagID = diag::warn_unusual_main_decl; 3717 if (isInline || getLangOptions().CPlusPlus) 3718 diagID = diag::err_unusual_main_decl; 3719 3720 int which = isStatic + (isInline << 1) - 1; 3721 Diag(FD->getLocation(), diagID) << which; 3722 } 3723 3724 QualType T = FD->getType(); 3725 assert(T->isFunctionType() && "function decl is not of function type"); 3726 const FunctionType* FT = T->getAs<FunctionType>(); 3727 3728 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3729 // TODO: add a replacement fixit to turn the return type into 'int'. 3730 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3731 FD->setInvalidDecl(true); 3732 } 3733 3734 // Treat protoless main() as nullary. 3735 if (isa<FunctionNoProtoType>(FT)) return; 3736 3737 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3738 unsigned nparams = FTP->getNumArgs(); 3739 assert(FD->getNumParams() == nparams); 3740 3741 bool HasExtraParameters = (nparams > 3); 3742 3743 // Darwin passes an undocumented fourth argument of type char**. If 3744 // other platforms start sprouting these, the logic below will start 3745 // getting shifty. 3746 if (nparams == 4 && 3747 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 3748 HasExtraParameters = false; 3749 3750 if (HasExtraParameters) { 3751 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 3752 FD->setInvalidDecl(true); 3753 nparams = 3; 3754 } 3755 3756 // FIXME: a lot of the following diagnostics would be improved 3757 // if we had some location information about types. 3758 3759 QualType CharPP = 3760 Context.getPointerType(Context.getPointerType(Context.CharTy)); 3761 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 3762 3763 for (unsigned i = 0; i < nparams; ++i) { 3764 QualType AT = FTP->getArgType(i); 3765 3766 bool mismatch = true; 3767 3768 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 3769 mismatch = false; 3770 else if (Expected[i] == CharPP) { 3771 // As an extension, the following forms are okay: 3772 // char const ** 3773 // char const * const * 3774 // char * const * 3775 3776 QualifierCollector qs; 3777 const PointerType* PT; 3778 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 3779 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 3780 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 3781 qs.removeConst(); 3782 mismatch = !qs.empty(); 3783 } 3784 } 3785 3786 if (mismatch) { 3787 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 3788 // TODO: suggest replacing given type with expected type 3789 FD->setInvalidDecl(true); 3790 } 3791 } 3792 3793 if (nparams == 1 && !FD->isInvalidDecl()) { 3794 Diag(FD->getLocation(), diag::warn_main_one_arg); 3795 } 3796} 3797 3798bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 3799 // FIXME: Need strict checking. In C89, we need to check for 3800 // any assignment, increment, decrement, function-calls, or 3801 // commas outside of a sizeof. In C99, it's the same list, 3802 // except that the aforementioned are allowed in unevaluated 3803 // expressions. Everything else falls under the 3804 // "may accept other forms of constant expressions" exception. 3805 // (We never end up here for C++, so the constant expression 3806 // rules there don't matter.) 3807 if (Init->isConstantInitializer(Context)) 3808 return false; 3809 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 3810 << Init->getSourceRange(); 3811 return true; 3812} 3813 3814void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 3815 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 3816} 3817 3818/// AddInitializerToDecl - Adds the initializer Init to the 3819/// declaration dcl. If DirectInit is true, this is C++ direct 3820/// initialization rather than copy initialization. 3821void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 3822 Decl *RealDecl = dcl.getAs<Decl>(); 3823 // If there is no declaration, there was an error parsing it. Just ignore 3824 // the initializer. 3825 if (RealDecl == 0) 3826 return; 3827 3828 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 3829 // With declarators parsed the way they are, the parser cannot 3830 // distinguish between a normal initializer and a pure-specifier. 3831 // Thus this grotesque test. 3832 IntegerLiteral *IL; 3833 Expr *Init = static_cast<Expr *>(init.get()); 3834 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 3835 Context.getCanonicalType(IL->getType()) == Context.IntTy) 3836 CheckPureMethod(Method, Init->getSourceRange()); 3837 else { 3838 Diag(Method->getLocation(), diag::err_member_function_initialization) 3839 << Method->getDeclName() << Init->getSourceRange(); 3840 Method->setInvalidDecl(); 3841 } 3842 return; 3843 } 3844 3845 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3846 if (!VDecl) { 3847 if (getLangOptions().CPlusPlus && 3848 RealDecl->getLexicalDeclContext()->isRecord() && 3849 isa<NamedDecl>(RealDecl)) 3850 Diag(RealDecl->getLocation(), diag::err_member_initialization) 3851 << cast<NamedDecl>(RealDecl)->getDeclName(); 3852 else 3853 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3854 RealDecl->setInvalidDecl(); 3855 return; 3856 } 3857 3858 // A definition must end up with a complete type, which means it must be 3859 // complete with the restriction that an array type might be completed by the 3860 // initializer; note that later code assumes this restriction. 3861 QualType BaseDeclType = VDecl->getType(); 3862 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 3863 BaseDeclType = Array->getElementType(); 3864 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 3865 diag::err_typecheck_decl_incomplete_type)) { 3866 RealDecl->setInvalidDecl(); 3867 return; 3868 } 3869 3870 // The variable can not have an abstract class type. 3871 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 3872 diag::err_abstract_type_in_decl, 3873 AbstractVariableType)) 3874 VDecl->setInvalidDecl(); 3875 3876 const VarDecl *Def; 3877 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 3878 Diag(VDecl->getLocation(), diag::err_redefinition) 3879 << VDecl->getDeclName(); 3880 Diag(Def->getLocation(), diag::note_previous_definition); 3881 VDecl->setInvalidDecl(); 3882 return; 3883 } 3884 3885 // Take ownership of the expression, now that we're sure we have somewhere 3886 // to put it. 3887 Expr *Init = init.takeAs<Expr>(); 3888 assert(Init && "missing initializer"); 3889 3890 // Capture the variable that is being initialized and the style of 3891 // initialization. 3892 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 3893 3894 // FIXME: Poor source location information. 3895 InitializationKind Kind 3896 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 3897 Init->getLocStart(), 3898 Init->getLocEnd()) 3899 : InitializationKind::CreateCopy(VDecl->getLocation(), 3900 Init->getLocStart()); 3901 3902 // Get the decls type and save a reference for later, since 3903 // CheckInitializerTypes may change it. 3904 QualType DclT = VDecl->getType(), SavT = DclT; 3905 if (VDecl->isBlockVarDecl()) { 3906 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 3907 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 3908 VDecl->setInvalidDecl(); 3909 } else if (!VDecl->isInvalidDecl()) { 3910 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3911 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3912 MultiExprArg(*this, (void**)&Init, 1), 3913 &DclT); 3914 if (Result.isInvalid()) { 3915 VDecl->setInvalidDecl(); 3916 return; 3917 } 3918 3919 Init = Result.takeAs<Expr>(); 3920 3921 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3922 // Don't check invalid declarations to avoid emitting useless diagnostics. 3923 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3924 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 3925 CheckForConstantInitializer(Init, DclT); 3926 } 3927 } 3928 } else if (VDecl->isStaticDataMember() && 3929 VDecl->getLexicalDeclContext()->isRecord()) { 3930 // This is an in-class initialization for a static data member, e.g., 3931 // 3932 // struct S { 3933 // static const int value = 17; 3934 // }; 3935 3936 // Attach the initializer 3937 VDecl->setInit(Init); 3938 3939 // C++ [class.mem]p4: 3940 // A member-declarator can contain a constant-initializer only 3941 // if it declares a static member (9.4) of const integral or 3942 // const enumeration type, see 9.4.2. 3943 QualType T = VDecl->getType(); 3944 if (!T->isDependentType() && 3945 (!Context.getCanonicalType(T).isConstQualified() || 3946 !T->isIntegralType())) { 3947 Diag(VDecl->getLocation(), diag::err_member_initialization) 3948 << VDecl->getDeclName() << Init->getSourceRange(); 3949 VDecl->setInvalidDecl(); 3950 } else { 3951 // C++ [class.static.data]p4: 3952 // If a static data member is of const integral or const 3953 // enumeration type, its declaration in the class definition 3954 // can specify a constant-initializer which shall be an 3955 // integral constant expression (5.19). 3956 if (!Init->isTypeDependent() && 3957 !Init->getType()->isIntegralType()) { 3958 // We have a non-dependent, non-integral or enumeration type. 3959 Diag(Init->getSourceRange().getBegin(), 3960 diag::err_in_class_initializer_non_integral_type) 3961 << Init->getType() << Init->getSourceRange(); 3962 VDecl->setInvalidDecl(); 3963 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 3964 // Check whether the expression is a constant expression. 3965 llvm::APSInt Value; 3966 SourceLocation Loc; 3967 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 3968 Diag(Loc, diag::err_in_class_initializer_non_constant) 3969 << Init->getSourceRange(); 3970 VDecl->setInvalidDecl(); 3971 } else if (!VDecl->getType()->isDependentType()) 3972 ImpCastExprToType(Init, VDecl->getType(), CastExpr::CK_IntegralCast); 3973 } 3974 } 3975 } else if (VDecl->isFileVarDecl()) { 3976 if (VDecl->getStorageClass() == VarDecl::Extern && 3977 (!getLangOptions().CPlusPlus || 3978 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 3979 Diag(VDecl->getLocation(), diag::warn_extern_init); 3980 if (!VDecl->isInvalidDecl()) { 3981 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3982 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3983 MultiExprArg(*this, (void**)&Init, 1), 3984 &DclT); 3985 if (Result.isInvalid()) { 3986 VDecl->setInvalidDecl(); 3987 return; 3988 } 3989 3990 Init = Result.takeAs<Expr>(); 3991 } 3992 3993 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3994 // Don't check invalid declarations to avoid emitting useless diagnostics. 3995 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3996 // C99 6.7.8p4. All file scoped initializers need to be constant. 3997 CheckForConstantInitializer(Init, DclT); 3998 } 3999 } 4000 // If the type changed, it means we had an incomplete type that was 4001 // completed by the initializer. For example: 4002 // int ary[] = { 1, 3, 5 }; 4003 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 4004 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 4005 VDecl->setType(DclT); 4006 Init->setType(DclT); 4007 } 4008 4009 Init = MaybeCreateCXXExprWithTemporaries(Init); 4010 // Attach the initializer to the decl. 4011 VDecl->setInit(Init); 4012 4013 if (getLangOptions().CPlusPlus) { 4014 // Make sure we mark the destructor as used if necessary. 4015 QualType InitType = VDecl->getType(); 4016 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 4017 InitType = Context.getBaseElementType(Array); 4018 if (const RecordType *Record = InitType->getAs<RecordType>()) 4019 FinalizeVarWithDestructor(VDecl, Record); 4020 } 4021 4022 return; 4023} 4024 4025/// ActOnInitializerError - Given that there was an error parsing an 4026/// initializer for the given declaration, try to return to some form 4027/// of sanity. 4028void Sema::ActOnInitializerError(DeclPtrTy dcl) { 4029 // Our main concern here is re-establishing invariants like "a 4030 // variable's type is either dependent or complete". 4031 Decl *D = dcl.getAs<Decl>(); 4032 if (!D || D->isInvalidDecl()) return; 4033 4034 VarDecl *VD = dyn_cast<VarDecl>(D); 4035 if (!VD) return; 4036 4037 QualType Ty = VD->getType(); 4038 if (Ty->isDependentType()) return; 4039 4040 // Require a complete type. 4041 if (RequireCompleteType(VD->getLocation(), 4042 Context.getBaseElementType(Ty), 4043 diag::err_typecheck_decl_incomplete_type)) { 4044 VD->setInvalidDecl(); 4045 return; 4046 } 4047 4048 // Require an abstract type. 4049 if (RequireNonAbstractType(VD->getLocation(), Ty, 4050 diag::err_abstract_type_in_decl, 4051 AbstractVariableType)) { 4052 VD->setInvalidDecl(); 4053 return; 4054 } 4055 4056 // Don't bother complaining about constructors or destructors, 4057 // though. 4058} 4059 4060void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 4061 bool TypeContainsUndeducedAuto) { 4062 Decl *RealDecl = dcl.getAs<Decl>(); 4063 4064 // If there is no declaration, there was an error parsing it. Just ignore it. 4065 if (RealDecl == 0) 4066 return; 4067 4068 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 4069 QualType Type = Var->getType(); 4070 4071 // C++0x [dcl.spec.auto]p3 4072 if (TypeContainsUndeducedAuto) { 4073 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 4074 << Var->getDeclName() << Type; 4075 Var->setInvalidDecl(); 4076 return; 4077 } 4078 4079 switch (Var->isThisDeclarationADefinition()) { 4080 case VarDecl::Definition: 4081 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 4082 break; 4083 4084 // We have an out-of-line definition of a static data member 4085 // that has an in-class initializer, so we type-check this like 4086 // a declaration. 4087 // 4088 // Fall through 4089 4090 case VarDecl::DeclarationOnly: 4091 // It's only a declaration. 4092 4093 // Block scope. C99 6.7p7: If an identifier for an object is 4094 // declared with no linkage (C99 6.2.2p6), the type for the 4095 // object shall be complete. 4096 if (!Type->isDependentType() && Var->isBlockVarDecl() && 4097 !Var->getLinkage() && !Var->isInvalidDecl() && 4098 RequireCompleteType(Var->getLocation(), Type, 4099 diag::err_typecheck_decl_incomplete_type)) 4100 Var->setInvalidDecl(); 4101 4102 // Make sure that the type is not abstract. 4103 if (!Type->isDependentType() && !Var->isInvalidDecl() && 4104 RequireNonAbstractType(Var->getLocation(), Type, 4105 diag::err_abstract_type_in_decl, 4106 AbstractVariableType)) 4107 Var->setInvalidDecl(); 4108 return; 4109 4110 case VarDecl::TentativeDefinition: 4111 // File scope. C99 6.9.2p2: A declaration of an identifier for an 4112 // object that has file scope without an initializer, and without a 4113 // storage-class specifier or with the storage-class specifier "static", 4114 // constitutes a tentative definition. Note: A tentative definition with 4115 // external linkage is valid (C99 6.2.2p5). 4116 if (!Var->isInvalidDecl()) { 4117 if (const IncompleteArrayType *ArrayT 4118 = Context.getAsIncompleteArrayType(Type)) { 4119 if (RequireCompleteType(Var->getLocation(), 4120 ArrayT->getElementType(), 4121 diag::err_illegal_decl_array_incomplete_type)) 4122 Var->setInvalidDecl(); 4123 } else if (Var->getStorageClass() == VarDecl::Static) { 4124 // C99 6.9.2p3: If the declaration of an identifier for an object is 4125 // a tentative definition and has internal linkage (C99 6.2.2p3), the 4126 // declared type shall not be an incomplete type. 4127 // NOTE: code such as the following 4128 // static struct s; 4129 // struct s { int a; }; 4130 // is accepted by gcc. Hence here we issue a warning instead of 4131 // an error and we do not invalidate the static declaration. 4132 // NOTE: to avoid multiple warnings, only check the first declaration. 4133 if (Var->getPreviousDeclaration() == 0) 4134 RequireCompleteType(Var->getLocation(), Type, 4135 diag::ext_typecheck_decl_incomplete_type); 4136 } 4137 } 4138 4139 // Record the tentative definition; we're done. 4140 if (!Var->isInvalidDecl()) 4141 TentativeDefinitions.push_back(Var); 4142 return; 4143 } 4144 4145 // Provide a specific diagnostic for uninitialized variable 4146 // definitions with incomplete array type. 4147 if (Type->isIncompleteArrayType()) { 4148 Diag(Var->getLocation(), 4149 diag::err_typecheck_incomplete_array_needs_initializer); 4150 Var->setInvalidDecl(); 4151 return; 4152 } 4153 4154 // Provide a specific diagnostic for uninitialized variable 4155 // definitions with reference type. 4156 if (Type->isReferenceType()) { 4157 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 4158 << Var->getDeclName() 4159 << SourceRange(Var->getLocation(), Var->getLocation()); 4160 Var->setInvalidDecl(); 4161 return; 4162 } 4163 4164 // Do not attempt to type-check the default initializer for a 4165 // variable with dependent type. 4166 if (Type->isDependentType()) 4167 return; 4168 4169 if (Var->isInvalidDecl()) 4170 return; 4171 4172 if (RequireCompleteType(Var->getLocation(), 4173 Context.getBaseElementType(Type), 4174 diag::err_typecheck_decl_incomplete_type)) { 4175 Var->setInvalidDecl(); 4176 return; 4177 } 4178 4179 // The variable can not have an abstract class type. 4180 if (RequireNonAbstractType(Var->getLocation(), Type, 4181 diag::err_abstract_type_in_decl, 4182 AbstractVariableType)) { 4183 Var->setInvalidDecl(); 4184 return; 4185 } 4186 4187 const RecordType *Record 4188 = Context.getBaseElementType(Type)->getAs<RecordType>(); 4189 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 4190 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 4191 // C++03 [dcl.init]p9: 4192 // If no initializer is specified for an object, and the 4193 // object is of (possibly cv-qualified) non-POD class type (or 4194 // array thereof), the object shall be default-initialized; if 4195 // the object is of const-qualified type, the underlying class 4196 // type shall have a user-declared default 4197 // constructor. Otherwise, if no initializer is specified for 4198 // a non- static object, the object and its subobjects, if 4199 // any, have an indeterminate initial value); if the object 4200 // or any of its subobjects are of const-qualified type, the 4201 // program is ill-formed. 4202 // FIXME: DPG thinks it is very fishy that C++0x disables this. 4203 } else { 4204 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 4205 InitializationKind Kind 4206 = InitializationKind::CreateDefault(Var->getLocation()); 4207 4208 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 4209 OwningExprResult Init = InitSeq.Perform(*this, Entity, Kind, 4210 MultiExprArg(*this, 0, 0)); 4211 if (Init.isInvalid()) 4212 Var->setInvalidDecl(); 4213 else if (Init.get()) 4214 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 4215 } 4216 4217 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record) 4218 FinalizeVarWithDestructor(Var, Record); 4219 } 4220} 4221 4222Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 4223 DeclPtrTy *Group, 4224 unsigned NumDecls) { 4225 llvm::SmallVector<Decl*, 8> Decls; 4226 4227 if (DS.isTypeSpecOwned()) 4228 Decls.push_back((Decl*)DS.getTypeRep()); 4229 4230 for (unsigned i = 0; i != NumDecls; ++i) 4231 if (Decl *D = Group[i].getAs<Decl>()) 4232 Decls.push_back(D); 4233 4234 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 4235 Decls.data(), Decls.size())); 4236} 4237 4238 4239/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 4240/// to introduce parameters into function prototype scope. 4241Sema::DeclPtrTy 4242Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 4243 const DeclSpec &DS = D.getDeclSpec(); 4244 4245 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 4246 VarDecl::StorageClass StorageClass = VarDecl::None; 4247 VarDecl::StorageClass StorageClassAsWritten = VarDecl::None; 4248 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 4249 StorageClass = VarDecl::Register; 4250 StorageClassAsWritten = VarDecl::Register; 4251 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 4252 Diag(DS.getStorageClassSpecLoc(), 4253 diag::err_invalid_storage_class_in_func_decl); 4254 D.getMutableDeclSpec().ClearStorageClassSpecs(); 4255 } 4256 4257 if (D.getDeclSpec().isThreadSpecified()) 4258 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4259 4260 DiagnoseFunctionSpecifiers(D); 4261 4262 // Check that there are no default arguments inside the type of this 4263 // parameter (C++ only). 4264 if (getLangOptions().CPlusPlus) 4265 CheckExtraCXXDefaultArguments(D); 4266 4267 TypeSourceInfo *TInfo = 0; 4268 TagDecl *OwnedDecl = 0; 4269 QualType parmDeclType = GetTypeForDeclarator(D, S, &TInfo, &OwnedDecl); 4270 4271 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 4272 // C++ [dcl.fct]p6: 4273 // Types shall not be defined in return or parameter types. 4274 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 4275 << Context.getTypeDeclType(OwnedDecl); 4276 } 4277 4278 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 4279 IdentifierInfo *II = D.getIdentifier(); 4280 if (II) { 4281 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 4282 ForRedeclaration); 4283 LookupName(R, S); 4284 if (R.isSingleResult()) { 4285 NamedDecl *PrevDecl = R.getFoundDecl(); 4286 if (PrevDecl->isTemplateParameter()) { 4287 // Maybe we will complain about the shadowed template parameter. 4288 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4289 // Just pretend that we didn't see the previous declaration. 4290 PrevDecl = 0; 4291 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 4292 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 4293 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4294 4295 // Recover by removing the name 4296 II = 0; 4297 D.SetIdentifier(0, D.getIdentifierLoc()); 4298 D.setInvalidType(true); 4299 } 4300 } 4301 } 4302 4303 // Temporarily put parameter variables in the translation unit, not 4304 // the enclosing context. This prevents them from accidentally 4305 // looking like class members in C++. 4306 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 4307 TInfo, parmDeclType, II, 4308 D.getIdentifierLoc(), 4309 StorageClass, StorageClassAsWritten); 4310 4311 if (D.isInvalidType()) 4312 New->setInvalidDecl(); 4313 4314 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 4315 if (D.getCXXScopeSpec().isSet()) { 4316 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 4317 << D.getCXXScopeSpec().getRange(); 4318 New->setInvalidDecl(); 4319 } 4320 4321 // Add the parameter declaration into this scope. 4322 S->AddDecl(DeclPtrTy::make(New)); 4323 if (II) 4324 IdResolver.AddDecl(New); 4325 4326 ProcessDeclAttributes(S, New, D); 4327 4328 if (New->hasAttr<BlocksAttr>()) { 4329 Diag(New->getLocation(), diag::err_block_on_nonlocal); 4330 } 4331 return DeclPtrTy::make(New); 4332} 4333 4334ParmVarDecl *Sema::CheckParameter(DeclContext *DC, 4335 TypeSourceInfo *TSInfo, QualType T, 4336 IdentifierInfo *Name, 4337 SourceLocation NameLoc, 4338 VarDecl::StorageClass StorageClass, 4339 VarDecl::StorageClass StorageClassAsWritten) { 4340 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, NameLoc, Name, 4341 adjustParameterType(T), TSInfo, 4342 StorageClass, StorageClassAsWritten, 4343 0); 4344 4345 // Parameters can not be abstract class types. 4346 // For record types, this is done by the AbstractClassUsageDiagnoser once 4347 // the class has been completely parsed. 4348 if (!CurContext->isRecord() && 4349 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 4350 AbstractParamType)) 4351 New->setInvalidDecl(); 4352 4353 // Parameter declarators cannot be interface types. All ObjC objects are 4354 // passed by reference. 4355 if (T->isObjCObjectType()) { 4356 Diag(NameLoc, 4357 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 4358 New->setInvalidDecl(); 4359 } 4360 4361 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 4362 // duration shall not be qualified by an address-space qualifier." 4363 // Since all parameters have automatic store duration, they can not have 4364 // an address space. 4365 if (T.getAddressSpace() != 0) { 4366 Diag(NameLoc, diag::err_arg_with_address_space); 4367 New->setInvalidDecl(); 4368 } 4369 4370 return New; 4371} 4372 4373void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 4374 SourceLocation LocAfterDecls) { 4375 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4376 "Not a function declarator!"); 4377 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4378 4379 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 4380 // for a K&R function. 4381 if (!FTI.hasPrototype) { 4382 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 4383 --i; 4384 if (FTI.ArgInfo[i].Param == 0) { 4385 llvm::SmallString<256> Code; 4386 llvm::raw_svector_ostream(Code) << " int " 4387 << FTI.ArgInfo[i].Ident->getName() 4388 << ";\n"; 4389 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 4390 << FTI.ArgInfo[i].Ident 4391 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 4392 4393 // Implicitly declare the argument as type 'int' for lack of a better 4394 // type. 4395 DeclSpec DS; 4396 const char* PrevSpec; // unused 4397 unsigned DiagID; // unused 4398 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 4399 PrevSpec, DiagID); 4400 Declarator ParamD(DS, Declarator::KNRTypeListContext); 4401 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 4402 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 4403 } 4404 } 4405 } 4406} 4407 4408Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 4409 Declarator &D) { 4410 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 4411 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4412 "Not a function declarator!"); 4413 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4414 4415 if (FTI.hasPrototype) { 4416 // FIXME: Diagnose arguments without names in C. 4417 } 4418 4419 Scope *ParentScope = FnBodyScope->getParent(); 4420 4421 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 4422 MultiTemplateParamsArg(*this), 4423 /*IsFunctionDefinition=*/true); 4424 return ActOnStartOfFunctionDef(FnBodyScope, DP); 4425} 4426 4427static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 4428 // Don't warn about invalid declarations. 4429 if (FD->isInvalidDecl()) 4430 return false; 4431 4432 // Or declarations that aren't global. 4433 if (!FD->isGlobal()) 4434 return false; 4435 4436 // Don't warn about C++ member functions. 4437 if (isa<CXXMethodDecl>(FD)) 4438 return false; 4439 4440 // Don't warn about 'main'. 4441 if (FD->isMain()) 4442 return false; 4443 4444 // Don't warn about inline functions. 4445 if (FD->isInlineSpecified()) 4446 return false; 4447 4448 // Don't warn about function templates. 4449 if (FD->getDescribedFunctionTemplate()) 4450 return false; 4451 4452 // Don't warn about function template specializations. 4453 if (FD->isFunctionTemplateSpecialization()) 4454 return false; 4455 4456 bool MissingPrototype = true; 4457 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4458 Prev; Prev = Prev->getPreviousDeclaration()) { 4459 // Ignore any declarations that occur in function or method 4460 // scope, because they aren't visible from the header. 4461 if (Prev->getDeclContext()->isFunctionOrMethod()) 4462 continue; 4463 4464 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4465 break; 4466 } 4467 4468 return MissingPrototype; 4469} 4470 4471Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 4472 // Clear the last template instantiation error context. 4473 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4474 4475 if (!D) 4476 return D; 4477 FunctionDecl *FD = 0; 4478 4479 if (FunctionTemplateDecl *FunTmpl 4480 = dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>())) 4481 FD = FunTmpl->getTemplatedDecl(); 4482 else 4483 FD = cast<FunctionDecl>(D.getAs<Decl>()); 4484 4485 // Enter a new function scope 4486 PushFunctionScope(); 4487 4488 // See if this is a redefinition. 4489 // But don't complain if we're in GNU89 mode and the previous definition 4490 // was an extern inline function. 4491 const FunctionDecl *Definition; 4492 if (FD->getBody(Definition) && 4493 !canRedefineFunction(Definition, getLangOptions())) { 4494 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4495 Diag(Definition->getLocation(), diag::note_previous_definition); 4496 } 4497 4498 // Builtin functions cannot be defined. 4499 if (unsigned BuiltinID = FD->getBuiltinID()) { 4500 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4501 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4502 FD->setInvalidDecl(); 4503 } 4504 } 4505 4506 // The return type of a function definition must be complete 4507 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4508 QualType ResultType = FD->getResultType(); 4509 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4510 !FD->isInvalidDecl() && 4511 RequireCompleteType(FD->getLocation(), ResultType, 4512 diag::err_func_def_incomplete_result)) 4513 FD->setInvalidDecl(); 4514 4515 // GNU warning -Wmissing-prototypes: 4516 // Warn if a global function is defined without a previous 4517 // prototype declaration. This warning is issued even if the 4518 // definition itself provides a prototype. The aim is to detect 4519 // global functions that fail to be declared in header files. 4520 if (ShouldWarnAboutMissingPrototype(FD)) 4521 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4522 4523 if (FnBodyScope) 4524 PushDeclContext(FnBodyScope, FD); 4525 4526 // Check the validity of our function parameters 4527 CheckParmsForFunctionDef(FD); 4528 4529 bool ShouldCheckShadow = 4530 Diags.getDiagnosticLevel(diag::warn_decl_shadow) != Diagnostic::Ignored; 4531 4532 // Introduce our parameters into the function scope 4533 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4534 ParmVarDecl *Param = FD->getParamDecl(p); 4535 Param->setOwningFunction(FD); 4536 4537 // If this has an identifier, add it to the scope stack. 4538 if (Param->getIdentifier() && FnBodyScope) { 4539 if (ShouldCheckShadow) 4540 CheckShadow(FnBodyScope, Param); 4541 4542 PushOnScopeChains(Param, FnBodyScope); 4543 } 4544 } 4545 4546 // Checking attributes of current function definition 4547 // dllimport attribute. 4548 if (FD->getAttr<DLLImportAttr>() && 4549 (!FD->getAttr<DLLExportAttr>())) { 4550 // dllimport attribute cannot be applied to definition. 4551 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 4552 Diag(FD->getLocation(), 4553 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4554 << "dllimport"; 4555 FD->setInvalidDecl(); 4556 return DeclPtrTy::make(FD); 4557 } 4558 4559 // Visual C++ appears to not think this is an issue, so only issue 4560 // a warning when Microsoft extensions are disabled. 4561 if (!LangOpts.Microsoft) { 4562 // If a symbol previously declared dllimport is later defined, the 4563 // attribute is ignored in subsequent references, and a warning is 4564 // emitted. 4565 Diag(FD->getLocation(), 4566 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4567 << FD->getNameAsCString() << "dllimport"; 4568 } 4569 } 4570 return DeclPtrTy::make(FD); 4571} 4572 4573/// \brief Given the set of return statements within a function body, 4574/// compute the variables that are subject to the named return value 4575/// optimization. 4576/// 4577/// Each of the variables that is subject to the named return value 4578/// optimization will be marked as NRVO variables in the AST, and any 4579/// return statement that has a marked NRVO variable as its NRVO candidate can 4580/// use the named return value optimization. 4581/// 4582/// This function applies a very simplistic algorithm for NRVO: if every return 4583/// statement in the function has the same NRVO candidate, that candidate is 4584/// the NRVO variable. 4585/// 4586/// FIXME: Employ a smarter algorithm that accounts for multiple return 4587/// statements and the lifetimes of the NRVO candidates. We should be able to 4588/// find a maximal set of NRVO variables. 4589static void ComputeNRVO(Stmt *Body, ReturnStmt **Returns, unsigned NumReturns) { 4590 const VarDecl *NRVOCandidate = 0; 4591 for (unsigned I = 0; I != NumReturns; ++I) { 4592 if (!Returns[I]->getNRVOCandidate()) 4593 return; 4594 4595 if (!NRVOCandidate) 4596 NRVOCandidate = Returns[I]->getNRVOCandidate(); 4597 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 4598 return; 4599 } 4600 4601 if (NRVOCandidate) 4602 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 4603} 4604 4605Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 4606 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4607} 4608 4609Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 4610 bool IsInstantiation) { 4611 Decl *dcl = D.getAs<Decl>(); 4612 Stmt *Body = BodyArg.takeAs<Stmt>(); 4613 4614 FunctionDecl *FD = 0; 4615 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4616 if (FunTmpl) 4617 FD = FunTmpl->getTemplatedDecl(); 4618 else 4619 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4620 4621 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 4622 4623 if (FD) { 4624 FD->setBody(Body); 4625 if (FD->isMain()) { 4626 // C and C++ allow for main to automagically return 0. 4627 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 4628 FD->setHasImplicitReturnZero(true); 4629 WP.disableCheckFallThrough(); 4630 } 4631 4632 if (!FD->isInvalidDecl()) { 4633 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 4634 4635 // If this is a constructor, we need a vtable. 4636 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 4637 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 4638 4639 ComputeNRVO(Body, FunctionScopes.back()->Returns.data(), 4640 FunctionScopes.back()->Returns.size()); 4641 } 4642 4643 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 4644 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 4645 assert(MD == getCurMethodDecl() && "Method parsing confused"); 4646 MD->setBody(Body); 4647 MD->setEndLoc(Body->getLocEnd()); 4648 if (!MD->isInvalidDecl()) 4649 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 4650 } else { 4651 Body->Destroy(Context); 4652 return DeclPtrTy(); 4653 } 4654 4655 // Verify and clean out per-function state. 4656 4657 // Check goto/label use. 4658 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 4659 I = getLabelMap().begin(), E = getLabelMap().end(); I != E; ++I) { 4660 LabelStmt *L = I->second; 4661 4662 // Verify that we have no forward references left. If so, there was a goto 4663 // or address of a label taken, but no definition of it. Label fwd 4664 // definitions are indicated with a null substmt. 4665 if (L->getSubStmt() != 0) 4666 continue; 4667 4668 // Emit error. 4669 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 4670 4671 // At this point, we have gotos that use the bogus label. Stitch it into 4672 // the function body so that they aren't leaked and that the AST is well 4673 // formed. 4674 if (Body == 0) { 4675 // The whole function wasn't parsed correctly, just delete this. 4676 L->Destroy(Context); 4677 continue; 4678 } 4679 4680 // Otherwise, the body is valid: we want to stitch the label decl into the 4681 // function somewhere so that it is properly owned and so that the goto 4682 // has a valid target. Do this by creating a new compound stmt with the 4683 // label in it. 4684 4685 // Give the label a sub-statement. 4686 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 4687 4688 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 4689 cast<CXXTryStmt>(Body)->getTryBlock() : 4690 cast<CompoundStmt>(Body); 4691 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(), 4692 Compound->body_end()); 4693 Elements.push_back(L); 4694 Compound->setStmts(Context, Elements.data(), Elements.size()); 4695 } 4696 4697 if (Body) { 4698 // C++ constructors that have function-try-blocks can't have return 4699 // statements in the handlers of that block. (C++ [except.handle]p14) 4700 // Verify this. 4701 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 4702 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 4703 4704 // Verify that that gotos and switch cases don't jump into scopes illegally. 4705 // Verify that that gotos and switch cases don't jump into scopes illegally. 4706 if (FunctionNeedsScopeChecking() && 4707 !dcl->isInvalidDecl() && 4708 !hasAnyErrorsInThisFunction()) 4709 DiagnoseInvalidJumps(Body); 4710 4711 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 4712 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4713 Destructor->getParent()); 4714 4715 // If any errors have occurred, clear out any temporaries that may have 4716 // been leftover. This ensures that these temporaries won't be picked up for 4717 // deletion in some later function. 4718 if (PP.getDiagnostics().hasErrorOccurred()) 4719 ExprTemporaries.clear(); 4720 else if (!isa<FunctionTemplateDecl>(dcl)) { 4721 // Since the body is valid, issue any analysis-based warnings that are 4722 // enabled. 4723 QualType ResultType; 4724 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 4725 ResultType = FD->getResultType(); 4726 } 4727 else { 4728 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl); 4729 ResultType = MD->getResultType(); 4730 } 4731 AnalysisWarnings.IssueWarnings(WP, dcl); 4732 } 4733 4734 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 4735 } 4736 4737 if (!IsInstantiation) 4738 PopDeclContext(); 4739 4740 PopFunctionOrBlockScope(); 4741 4742 // If any errors have occurred, clear out any temporaries that may have 4743 // been leftover. This ensures that these temporaries won't be picked up for 4744 // deletion in some later function. 4745 if (getDiagnostics().hasErrorOccurred()) 4746 ExprTemporaries.clear(); 4747 4748 return D; 4749} 4750 4751/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 4752/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 4753NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 4754 IdentifierInfo &II, Scope *S) { 4755 // Before we produce a declaration for an implicitly defined 4756 // function, see whether there was a locally-scoped declaration of 4757 // this name as a function or variable. If so, use that 4758 // (non-visible) declaration, and complain about it. 4759 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4760 = LocallyScopedExternalDecls.find(&II); 4761 if (Pos != LocallyScopedExternalDecls.end()) { 4762 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 4763 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 4764 return Pos->second; 4765 } 4766 4767 // Extension in C99. Legal in C90, but warn about it. 4768 if (II.getName().startswith("__builtin_")) 4769 Diag(Loc, diag::warn_builtin_unknown) << &II; 4770 else if (getLangOptions().C99) 4771 Diag(Loc, diag::ext_implicit_function_decl) << &II; 4772 else 4773 Diag(Loc, diag::warn_implicit_function_decl) << &II; 4774 4775 // Set a Declarator for the implicit definition: int foo(); 4776 const char *Dummy; 4777 DeclSpec DS; 4778 unsigned DiagID; 4779 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 4780 Error = Error; // Silence warning. 4781 assert(!Error && "Error setting up implicit decl!"); 4782 Declarator D(DS, Declarator::BlockContext); 4783 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 4784 0, 0, false, SourceLocation(), 4785 false, 0,0,0, Loc, Loc, D), 4786 SourceLocation()); 4787 D.SetIdentifier(&II, Loc); 4788 4789 // Insert this function into translation-unit scope. 4790 4791 DeclContext *PrevDC = CurContext; 4792 CurContext = Context.getTranslationUnitDecl(); 4793 4794 FunctionDecl *FD = 4795 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 4796 FD->setImplicit(); 4797 4798 CurContext = PrevDC; 4799 4800 AddKnownFunctionAttributes(FD); 4801 4802 return FD; 4803} 4804 4805/// \brief Adds any function attributes that we know a priori based on 4806/// the declaration of this function. 4807/// 4808/// These attributes can apply both to implicitly-declared builtins 4809/// (like __builtin___printf_chk) or to library-declared functions 4810/// like NSLog or printf. 4811void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 4812 if (FD->isInvalidDecl()) 4813 return; 4814 4815 // If this is a built-in function, map its builtin attributes to 4816 // actual attributes. 4817 if (unsigned BuiltinID = FD->getBuiltinID()) { 4818 // Handle printf-formatting attributes. 4819 unsigned FormatIdx; 4820 bool HasVAListArg; 4821 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 4822 if (!FD->getAttr<FormatAttr>()) 4823 FD->addAttr(::new (Context) FormatAttr(Context, "printf", FormatIdx+1, 4824 HasVAListArg ? 0 : FormatIdx+2)); 4825 } 4826 4827 // Mark const if we don't care about errno and that is the only 4828 // thing preventing the function from being const. This allows 4829 // IRgen to use LLVM intrinsics for such functions. 4830 if (!getLangOptions().MathErrno && 4831 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 4832 if (!FD->getAttr<ConstAttr>()) 4833 FD->addAttr(::new (Context) ConstAttr()); 4834 } 4835 4836 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 4837 FD->setType(Context.getNoReturnType(FD->getType())); 4838 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 4839 FD->addAttr(::new (Context) NoThrowAttr()); 4840 if (Context.BuiltinInfo.isConst(BuiltinID)) 4841 FD->addAttr(::new (Context) ConstAttr()); 4842 } 4843 4844 IdentifierInfo *Name = FD->getIdentifier(); 4845 if (!Name) 4846 return; 4847 if ((!getLangOptions().CPlusPlus && 4848 FD->getDeclContext()->isTranslationUnit()) || 4849 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 4850 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 4851 LinkageSpecDecl::lang_c)) { 4852 // Okay: this could be a libc/libm/Objective-C function we know 4853 // about. 4854 } else 4855 return; 4856 4857 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 4858 // FIXME: NSLog and NSLogv should be target specific 4859 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 4860 // FIXME: We known better than our headers. 4861 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 4862 } else 4863 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 1, 4864 Name->isStr("NSLogv") ? 0 : 2)); 4865 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 4866 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 4867 // target-specific builtins, perhaps? 4868 if (!FD->getAttr<FormatAttr>()) 4869 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 2, 4870 Name->isStr("vasprintf") ? 0 : 3)); 4871 } 4872} 4873 4874TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 4875 TypeSourceInfo *TInfo) { 4876 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 4877 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 4878 4879 if (!TInfo) { 4880 assert(D.isInvalidType() && "no declarator info for valid type"); 4881 TInfo = Context.getTrivialTypeSourceInfo(T); 4882 } 4883 4884 // Scope manipulation handled by caller. 4885 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 4886 D.getIdentifierLoc(), 4887 D.getIdentifier(), 4888 TInfo); 4889 4890 if (const TagType *TT = T->getAs<TagType>()) { 4891 TagDecl *TD = TT->getDecl(); 4892 4893 // If the TagDecl that the TypedefDecl points to is an anonymous decl 4894 // keep track of the TypedefDecl. 4895 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 4896 TD->setTypedefForAnonDecl(NewTD); 4897 } 4898 4899 if (D.isInvalidType()) 4900 NewTD->setInvalidDecl(); 4901 return NewTD; 4902} 4903 4904 4905/// \brief Determine whether a tag with a given kind is acceptable 4906/// as a redeclaration of the given tag declaration. 4907/// 4908/// \returns true if the new tag kind is acceptable, false otherwise. 4909bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 4910 TagTypeKind NewTag, 4911 SourceLocation NewTagLoc, 4912 const IdentifierInfo &Name) { 4913 // C++ [dcl.type.elab]p3: 4914 // The class-key or enum keyword present in the 4915 // elaborated-type-specifier shall agree in kind with the 4916 // declaration to which the name in the elaborated-type-specifier 4917 // refers. This rule also applies to the form of 4918 // elaborated-type-specifier that declares a class-name or 4919 // friend class since it can be construed as referring to the 4920 // definition of the class. Thus, in any 4921 // elaborated-type-specifier, the enum keyword shall be used to 4922 // refer to an enumeration (7.2), the union class-key shall be 4923 // used to refer to a union (clause 9), and either the class or 4924 // struct class-key shall be used to refer to a class (clause 9) 4925 // declared using the class or struct class-key. 4926 TagTypeKind OldTag = Previous->getTagKind(); 4927 if (OldTag == NewTag) 4928 return true; 4929 4930 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 4931 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 4932 // Warn about the struct/class tag mismatch. 4933 bool isTemplate = false; 4934 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 4935 isTemplate = Record->getDescribedClassTemplate(); 4936 4937 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 4938 << (NewTag == TTK_Class) 4939 << isTemplate << &Name 4940 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 4941 OldTag == TTK_Class? "class" : "struct"); 4942 Diag(Previous->getLocation(), diag::note_previous_use); 4943 return true; 4944 } 4945 return false; 4946} 4947 4948/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 4949/// former case, Name will be non-null. In the later case, Name will be null. 4950/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 4951/// reference/declaration/definition of a tag. 4952Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 4953 SourceLocation KWLoc, CXXScopeSpec &SS, 4954 IdentifierInfo *Name, SourceLocation NameLoc, 4955 AttributeList *Attr, AccessSpecifier AS, 4956 MultiTemplateParamsArg TemplateParameterLists, 4957 bool &OwnedDecl, bool &IsDependent) { 4958 // If this is not a definition, it must have a name. 4959 assert((Name != 0 || TUK == TUK_Definition) && 4960 "Nameless record must be a definition!"); 4961 4962 OwnedDecl = false; 4963 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 4964 4965 // FIXME: Check explicit specializations more carefully. 4966 bool isExplicitSpecialization = false; 4967 if (TUK != TUK_Reference) { 4968 if (TemplateParameterList *TemplateParams 4969 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 4970 (TemplateParameterList**)TemplateParameterLists.get(), 4971 TemplateParameterLists.size(), 4972 TUK == TUK_Friend, 4973 isExplicitSpecialization)) { 4974 if (TemplateParams->size() > 0) { 4975 // This is a declaration or definition of a class template (which may 4976 // be a member of another template). 4977 OwnedDecl = false; 4978 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 4979 SS, Name, NameLoc, Attr, 4980 TemplateParams, 4981 AS); 4982 TemplateParameterLists.release(); 4983 return Result.get(); 4984 } else { 4985 // The "template<>" header is extraneous. 4986 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 4987 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 4988 isExplicitSpecialization = true; 4989 } 4990 } 4991 4992 TemplateParameterLists.release(); 4993 } 4994 4995 DeclContext *SearchDC = CurContext; 4996 DeclContext *DC = CurContext; 4997 bool isStdBadAlloc = false; 4998 bool Invalid = false; 4999 5000 RedeclarationKind Redecl = ForRedeclaration; 5001 if (TUK == TUK_Friend || TUK == TUK_Reference) 5002 Redecl = NotForRedeclaration; 5003 5004 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 5005 5006 if (Name && SS.isNotEmpty()) { 5007 // We have a nested-name tag ('struct foo::bar'). 5008 5009 // Check for invalid 'foo::'. 5010 if (SS.isInvalid()) { 5011 Name = 0; 5012 goto CreateNewDecl; 5013 } 5014 5015 // If this is a friend or a reference to a class in a dependent 5016 // context, don't try to make a decl for it. 5017 if (TUK == TUK_Friend || TUK == TUK_Reference) { 5018 DC = computeDeclContext(SS, false); 5019 if (!DC) { 5020 IsDependent = true; 5021 return DeclPtrTy(); 5022 } 5023 } else { 5024 DC = computeDeclContext(SS, true); 5025 if (!DC) { 5026 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 5027 << SS.getRange(); 5028 return DeclPtrTy(); 5029 } 5030 } 5031 5032 if (RequireCompleteDeclContext(SS, DC)) 5033 return DeclPtrTy::make((Decl *)0); 5034 5035 SearchDC = DC; 5036 // Look-up name inside 'foo::'. 5037 LookupQualifiedName(Previous, DC); 5038 5039 if (Previous.isAmbiguous()) 5040 return DeclPtrTy(); 5041 5042 if (Previous.empty()) { 5043 // Name lookup did not find anything. However, if the 5044 // nested-name-specifier refers to the current instantiation, 5045 // and that current instantiation has any dependent base 5046 // classes, we might find something at instantiation time: treat 5047 // this as a dependent elaborated-type-specifier. 5048 if (Previous.wasNotFoundInCurrentInstantiation()) { 5049 IsDependent = true; 5050 return DeclPtrTy(); 5051 } 5052 5053 // A tag 'foo::bar' must already exist. 5054 Diag(NameLoc, diag::err_not_tag_in_scope) 5055 << Kind << Name << DC << SS.getRange(); 5056 Name = 0; 5057 Invalid = true; 5058 goto CreateNewDecl; 5059 } 5060 } else if (Name) { 5061 // If this is a named struct, check to see if there was a previous forward 5062 // declaration or definition. 5063 // FIXME: We're looking into outer scopes here, even when we 5064 // shouldn't be. Doing so can result in ambiguities that we 5065 // shouldn't be diagnosing. 5066 LookupName(Previous, S); 5067 5068 // Note: there used to be some attempt at recovery here. 5069 if (Previous.isAmbiguous()) 5070 return DeclPtrTy(); 5071 5072 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 5073 // FIXME: This makes sure that we ignore the contexts associated 5074 // with C structs, unions, and enums when looking for a matching 5075 // tag declaration or definition. See the similar lookup tweak 5076 // in Sema::LookupName; is there a better way to deal with this? 5077 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 5078 SearchDC = SearchDC->getParent(); 5079 } 5080 } 5081 5082 if (Previous.isSingleResult() && 5083 Previous.getFoundDecl()->isTemplateParameter()) { 5084 // Maybe we will complain about the shadowed template parameter. 5085 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 5086 // Just pretend that we didn't see the previous declaration. 5087 Previous.clear(); 5088 } 5089 5090 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 5091 DC->Equals(StdNamespace) && Name->isStr("bad_alloc")) { 5092 // This is a declaration of or a reference to "std::bad_alloc". 5093 isStdBadAlloc = true; 5094 5095 if (Previous.empty() && StdBadAlloc) { 5096 // std::bad_alloc has been implicitly declared (but made invisible to 5097 // name lookup). Fill in this implicit declaration as the previous 5098 // declaration, so that the declarations get chained appropriately. 5099 Previous.addDecl(StdBadAlloc); 5100 } 5101 } 5102 5103 // If we didn't find a previous declaration, and this is a reference 5104 // (or friend reference), move to the correct scope. In C++, we 5105 // also need to do a redeclaration lookup there, just in case 5106 // there's a shadow friend decl. 5107 if (Name && Previous.empty() && 5108 (TUK == TUK_Reference || TUK == TUK_Friend)) { 5109 if (Invalid) goto CreateNewDecl; 5110 assert(SS.isEmpty()); 5111 5112 if (TUK == TUK_Reference) { 5113 // C++ [basic.scope.pdecl]p5: 5114 // -- for an elaborated-type-specifier of the form 5115 // 5116 // class-key identifier 5117 // 5118 // if the elaborated-type-specifier is used in the 5119 // decl-specifier-seq or parameter-declaration-clause of a 5120 // function defined in namespace scope, the identifier is 5121 // declared as a class-name in the namespace that contains 5122 // the declaration; otherwise, except as a friend 5123 // declaration, the identifier is declared in the smallest 5124 // non-class, non-function-prototype scope that contains the 5125 // declaration. 5126 // 5127 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 5128 // C structs and unions. 5129 // 5130 // It is an error in C++ to declare (rather than define) an enum 5131 // type, including via an elaborated type specifier. We'll 5132 // diagnose that later; for now, declare the enum in the same 5133 // scope as we would have picked for any other tag type. 5134 // 5135 // GNU C also supports this behavior as part of its incomplete 5136 // enum types extension, while GNU C++ does not. 5137 // 5138 // Find the context where we'll be declaring the tag. 5139 // FIXME: We would like to maintain the current DeclContext as the 5140 // lexical context, 5141 while (SearchDC->isRecord()) 5142 SearchDC = SearchDC->getParent(); 5143 5144 // Find the scope where we'll be declaring the tag. 5145 while (S->isClassScope() || 5146 (getLangOptions().CPlusPlus && 5147 S->isFunctionPrototypeScope()) || 5148 ((S->getFlags() & Scope::DeclScope) == 0) || 5149 (S->getEntity() && 5150 ((DeclContext *)S->getEntity())->isTransparentContext())) 5151 S = S->getParent(); 5152 } else { 5153 assert(TUK == TUK_Friend); 5154 // C++ [namespace.memdef]p3: 5155 // If a friend declaration in a non-local class first declares a 5156 // class or function, the friend class or function is a member of 5157 // the innermost enclosing namespace. 5158 SearchDC = SearchDC->getEnclosingNamespaceContext(); 5159 } 5160 5161 // In C++, we need to do a redeclaration lookup to properly 5162 // diagnose some problems. 5163 if (getLangOptions().CPlusPlus) { 5164 Previous.setRedeclarationKind(ForRedeclaration); 5165 LookupQualifiedName(Previous, SearchDC); 5166 } 5167 } 5168 5169 if (!Previous.empty()) { 5170 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 5171 5172 // It's okay to have a tag decl in the same scope as a typedef 5173 // which hides a tag decl in the same scope. Finding this 5174 // insanity with a redeclaration lookup can only actually happen 5175 // in C++. 5176 // 5177 // This is also okay for elaborated-type-specifiers, which is 5178 // technically forbidden by the current standard but which is 5179 // okay according to the likely resolution of an open issue; 5180 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 5181 if (getLangOptions().CPlusPlus) { 5182 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(PrevDecl)) { 5183 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 5184 TagDecl *Tag = TT->getDecl(); 5185 if (Tag->getDeclName() == Name && 5186 Tag->getDeclContext()->getLookupContext() 5187 ->Equals(TD->getDeclContext()->getLookupContext())) { 5188 PrevDecl = Tag; 5189 Previous.clear(); 5190 Previous.addDecl(Tag); 5191 } 5192 } 5193 } 5194 } 5195 5196 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 5197 // If this is a use of a previous tag, or if the tag is already declared 5198 // in the same scope (so that the definition/declaration completes or 5199 // rementions the tag), reuse the decl. 5200 if (TUK == TUK_Reference || TUK == TUK_Friend || 5201 isDeclInScope(PrevDecl, SearchDC, S)) { 5202 // Make sure that this wasn't declared as an enum and now used as a 5203 // struct or something similar. 5204 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 5205 bool SafeToContinue 5206 = (PrevTagDecl->getTagKind() != TTK_Enum && 5207 Kind != TTK_Enum); 5208 if (SafeToContinue) 5209 Diag(KWLoc, diag::err_use_with_wrong_tag) 5210 << Name 5211 << FixItHint::CreateReplacement(SourceRange(KWLoc), 5212 PrevTagDecl->getKindName()); 5213 else 5214 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 5215 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 5216 5217 if (SafeToContinue) 5218 Kind = PrevTagDecl->getTagKind(); 5219 else { 5220 // Recover by making this an anonymous redefinition. 5221 Name = 0; 5222 Previous.clear(); 5223 Invalid = true; 5224 } 5225 } 5226 5227 if (!Invalid) { 5228 // If this is a use, just return the declaration we found. 5229 5230 // FIXME: In the future, return a variant or some other clue 5231 // for the consumer of this Decl to know it doesn't own it. 5232 // For our current ASTs this shouldn't be a problem, but will 5233 // need to be changed with DeclGroups. 5234 if (TUK == TUK_Reference || TUK == TUK_Friend) 5235 return DeclPtrTy::make(PrevTagDecl); 5236 5237 // Diagnose attempts to redefine a tag. 5238 if (TUK == TUK_Definition) { 5239 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 5240 // If we're defining a specialization and the previous definition 5241 // is from an implicit instantiation, don't emit an error 5242 // here; we'll catch this in the general case below. 5243 if (!isExplicitSpecialization || 5244 !isa<CXXRecordDecl>(Def) || 5245 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 5246 == TSK_ExplicitSpecialization) { 5247 Diag(NameLoc, diag::err_redefinition) << Name; 5248 Diag(Def->getLocation(), diag::note_previous_definition); 5249 // If this is a redefinition, recover by making this 5250 // struct be anonymous, which will make any later 5251 // references get the previous definition. 5252 Name = 0; 5253 Previous.clear(); 5254 Invalid = true; 5255 } 5256 } else { 5257 // If the type is currently being defined, complain 5258 // about a nested redefinition. 5259 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 5260 if (Tag->isBeingDefined()) { 5261 Diag(NameLoc, diag::err_nested_redefinition) << Name; 5262 Diag(PrevTagDecl->getLocation(), 5263 diag::note_previous_definition); 5264 Name = 0; 5265 Previous.clear(); 5266 Invalid = true; 5267 } 5268 } 5269 5270 // Okay, this is definition of a previously declared or referenced 5271 // tag PrevDecl. We're going to create a new Decl for it. 5272 } 5273 } 5274 // If we get here we have (another) forward declaration or we 5275 // have a definition. Just create a new decl. 5276 5277 } else { 5278 // If we get here, this is a definition of a new tag type in a nested 5279 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 5280 // new decl/type. We set PrevDecl to NULL so that the entities 5281 // have distinct types. 5282 Previous.clear(); 5283 } 5284 // If we get here, we're going to create a new Decl. If PrevDecl 5285 // is non-NULL, it's a definition of the tag declared by 5286 // PrevDecl. If it's NULL, we have a new definition. 5287 5288 5289 // Otherwise, PrevDecl is not a tag, but was found with tag 5290 // lookup. This is only actually possible in C++, where a few 5291 // things like templates still live in the tag namespace. 5292 } else { 5293 assert(getLangOptions().CPlusPlus); 5294 5295 // Use a better diagnostic if an elaborated-type-specifier 5296 // found the wrong kind of type on the first 5297 // (non-redeclaration) lookup. 5298 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 5299 !Previous.isForRedeclaration()) { 5300 unsigned Kind = 0; 5301 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5302 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5303 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 5304 Diag(PrevDecl->getLocation(), diag::note_declared_at); 5305 Invalid = true; 5306 5307 // Otherwise, only diagnose if the declaration is in scope. 5308 } else if (!isDeclInScope(PrevDecl, SearchDC, S)) { 5309 // do nothing 5310 5311 // Diagnose implicit declarations introduced by elaborated types. 5312 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 5313 unsigned Kind = 0; 5314 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5315 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5316 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 5317 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5318 Invalid = true; 5319 5320 // Otherwise it's a declaration. Call out a particularly common 5321 // case here. 5322 } else if (isa<TypedefDecl>(PrevDecl)) { 5323 Diag(NameLoc, diag::err_tag_definition_of_typedef) 5324 << Name 5325 << cast<TypedefDecl>(PrevDecl)->getUnderlyingType(); 5326 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5327 Invalid = true; 5328 5329 // Otherwise, diagnose. 5330 } else { 5331 // The tag name clashes with something else in the target scope, 5332 // issue an error and recover by making this tag be anonymous. 5333 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 5334 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5335 Name = 0; 5336 Invalid = true; 5337 } 5338 5339 // The existing declaration isn't relevant to us; we're in a 5340 // new scope, so clear out the previous declaration. 5341 Previous.clear(); 5342 } 5343 } 5344 5345CreateNewDecl: 5346 5347 TagDecl *PrevDecl = 0; 5348 if (Previous.isSingleResult()) 5349 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 5350 5351 // If there is an identifier, use the location of the identifier as the 5352 // location of the decl, otherwise use the location of the struct/union 5353 // keyword. 5354 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 5355 5356 // Otherwise, create a new declaration. If there is a previous 5357 // declaration of the same entity, the two will be linked via 5358 // PrevDecl. 5359 TagDecl *New; 5360 5361 if (Kind == TTK_Enum) { 5362 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5363 // enum X { A, B, C } D; D should chain to X. 5364 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 5365 cast_or_null<EnumDecl>(PrevDecl)); 5366 // If this is an undefined enum, warn. 5367 if (TUK != TUK_Definition && !Invalid) { 5368 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 5369 : diag::ext_forward_ref_enum; 5370 Diag(Loc, DK); 5371 } 5372 } else { 5373 // struct/union/class 5374 5375 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5376 // struct X { int A; } D; D should chain to X. 5377 if (getLangOptions().CPlusPlus) { 5378 // FIXME: Look for a way to use RecordDecl for simple structs. 5379 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5380 cast_or_null<CXXRecordDecl>(PrevDecl)); 5381 5382 if (isStdBadAlloc && (!StdBadAlloc || StdBadAlloc->isImplicit())) 5383 StdBadAlloc = cast<CXXRecordDecl>(New); 5384 } else 5385 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5386 cast_or_null<RecordDecl>(PrevDecl)); 5387 } 5388 5389 // Maybe add qualifier info. 5390 if (SS.isNotEmpty()) { 5391 if (SS.isSet()) { 5392 NestedNameSpecifier *NNS 5393 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5394 New->setQualifierInfo(NNS, SS.getRange()); 5395 } 5396 else 5397 Invalid = true; 5398 } 5399 5400 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 5401 // Add alignment attributes if necessary; these attributes are checked when 5402 // the ASTContext lays out the structure. 5403 // 5404 // It is important for implementing the correct semantics that this 5405 // happen here (in act on tag decl). The #pragma pack stack is 5406 // maintained as a result of parser callbacks which can occur at 5407 // many points during the parsing of a struct declaration (because 5408 // the #pragma tokens are effectively skipped over during the 5409 // parsing of the struct). 5410 AddAlignmentAttributesForRecord(RD); 5411 } 5412 5413 // If this is a specialization of a member class (of a class template), 5414 // check the specialization. 5415 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 5416 Invalid = true; 5417 5418 if (Invalid) 5419 New->setInvalidDecl(); 5420 5421 if (Attr) 5422 ProcessDeclAttributeList(S, New, Attr); 5423 5424 // If we're declaring or defining a tag in function prototype scope 5425 // in C, note that this type can only be used within the function. 5426 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 5427 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 5428 5429 // Set the lexical context. If the tag has a C++ scope specifier, the 5430 // lexical context will be different from the semantic context. 5431 New->setLexicalDeclContext(CurContext); 5432 5433 // Mark this as a friend decl if applicable. 5434 if (TUK == TUK_Friend) 5435 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 5436 5437 // Set the access specifier. 5438 if (!Invalid && SearchDC->isRecord()) 5439 SetMemberAccessSpecifier(New, PrevDecl, AS); 5440 5441 if (TUK == TUK_Definition) 5442 New->startDefinition(); 5443 5444 // If this has an identifier, add it to the scope stack. 5445 if (TUK == TUK_Friend) { 5446 // We might be replacing an existing declaration in the lookup tables; 5447 // if so, borrow its access specifier. 5448 if (PrevDecl) 5449 New->setAccess(PrevDecl->getAccess()); 5450 5451 DeclContext *DC = New->getDeclContext()->getLookupContext(); 5452 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 5453 if (Name) // can be null along some error paths 5454 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5455 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 5456 } else if (Name) { 5457 S = getNonFieldDeclScope(S); 5458 PushOnScopeChains(New, S); 5459 } else { 5460 CurContext->addDecl(New); 5461 } 5462 5463 // If this is the C FILE type, notify the AST context. 5464 if (IdentifierInfo *II = New->getIdentifier()) 5465 if (!New->isInvalidDecl() && 5466 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 5467 II->isStr("FILE")) 5468 Context.setFILEDecl(New); 5469 5470 OwnedDecl = true; 5471 return DeclPtrTy::make(New); 5472} 5473 5474void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 5475 AdjustDeclIfTemplate(TagD); 5476 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5477 5478 // Enter the tag context. 5479 PushDeclContext(S, Tag); 5480} 5481 5482void Sema::ActOnStartCXXMemberDeclarations(Scope *S, DeclPtrTy TagD, 5483 SourceLocation LBraceLoc) { 5484 AdjustDeclIfTemplate(TagD); 5485 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD.getAs<Decl>()); 5486 5487 FieldCollector->StartClass(); 5488 5489 if (!Record->getIdentifier()) 5490 return; 5491 5492 // C++ [class]p2: 5493 // [...] The class-name is also inserted into the scope of the 5494 // class itself; this is known as the injected-class-name. For 5495 // purposes of access checking, the injected-class-name is treated 5496 // as if it were a public member name. 5497 CXXRecordDecl *InjectedClassName 5498 = CXXRecordDecl::Create(Context, Record->getTagKind(), 5499 CurContext, Record->getLocation(), 5500 Record->getIdentifier(), 5501 Record->getTagKeywordLoc(), 5502 Record); 5503 InjectedClassName->setImplicit(); 5504 InjectedClassName->setAccess(AS_public); 5505 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 5506 InjectedClassName->setDescribedClassTemplate(Template); 5507 PushOnScopeChains(InjectedClassName, S); 5508 assert(InjectedClassName->isInjectedClassName() && 5509 "Broken injected-class-name"); 5510} 5511 5512void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 5513 SourceLocation RBraceLoc) { 5514 AdjustDeclIfTemplate(TagD); 5515 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5516 Tag->setRBraceLoc(RBraceLoc); 5517 5518 if (isa<CXXRecordDecl>(Tag)) 5519 FieldCollector->FinishClass(); 5520 5521 // Exit this scope of this tag's definition. 5522 PopDeclContext(); 5523 5524 // Notify the consumer that we've defined a tag. 5525 Consumer.HandleTagDeclDefinition(Tag); 5526} 5527 5528void Sema::ActOnTagDefinitionError(Scope *S, DeclPtrTy TagD) { 5529 AdjustDeclIfTemplate(TagD); 5530 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5531 Tag->setInvalidDecl(); 5532 5533 // We're undoing ActOnTagStartDefinition here, not 5534 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 5535 // the FieldCollector. 5536 5537 PopDeclContext(); 5538} 5539 5540// Note that FieldName may be null for anonymous bitfields. 5541bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 5542 QualType FieldTy, const Expr *BitWidth, 5543 bool *ZeroWidth) { 5544 // Default to true; that shouldn't confuse checks for emptiness 5545 if (ZeroWidth) 5546 *ZeroWidth = true; 5547 5548 // C99 6.7.2.1p4 - verify the field type. 5549 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 5550 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 5551 // Handle incomplete types with specific error. 5552 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 5553 return true; 5554 if (FieldName) 5555 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 5556 << FieldName << FieldTy << BitWidth->getSourceRange(); 5557 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 5558 << FieldTy << BitWidth->getSourceRange(); 5559 } 5560 5561 // If the bit-width is type- or value-dependent, don't try to check 5562 // it now. 5563 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 5564 return false; 5565 5566 llvm::APSInt Value; 5567 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 5568 return true; 5569 5570 if (Value != 0 && ZeroWidth) 5571 *ZeroWidth = false; 5572 5573 // Zero-width bitfield is ok for anonymous field. 5574 if (Value == 0 && FieldName) 5575 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 5576 5577 if (Value.isSigned() && Value.isNegative()) { 5578 if (FieldName) 5579 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 5580 << FieldName << Value.toString(10); 5581 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 5582 << Value.toString(10); 5583 } 5584 5585 if (!FieldTy->isDependentType()) { 5586 uint64_t TypeSize = Context.getTypeSize(FieldTy); 5587 if (Value.getZExtValue() > TypeSize) { 5588 if (!getLangOptions().CPlusPlus) { 5589 if (FieldName) 5590 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 5591 << FieldName << (unsigned)Value.getZExtValue() 5592 << (unsigned)TypeSize; 5593 5594 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 5595 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 5596 } 5597 5598 if (FieldName) 5599 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 5600 << FieldName << (unsigned)Value.getZExtValue() 5601 << (unsigned)TypeSize; 5602 else 5603 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 5604 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 5605 } 5606 } 5607 5608 return false; 5609} 5610 5611/// ActOnField - Each field of a struct/union/class is passed into this in order 5612/// to create a FieldDecl object for it. 5613Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 5614 SourceLocation DeclStart, 5615 Declarator &D, ExprTy *BitfieldWidth) { 5616 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 5617 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 5618 AS_public); 5619 return DeclPtrTy::make(Res); 5620} 5621 5622/// HandleField - Analyze a field of a C struct or a C++ data member. 5623/// 5624FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 5625 SourceLocation DeclStart, 5626 Declarator &D, Expr *BitWidth, 5627 AccessSpecifier AS) { 5628 IdentifierInfo *II = D.getIdentifier(); 5629 SourceLocation Loc = DeclStart; 5630 if (II) Loc = D.getIdentifierLoc(); 5631 5632 TypeSourceInfo *TInfo = 0; 5633 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5634 if (getLangOptions().CPlusPlus) 5635 CheckExtraCXXDefaultArguments(D); 5636 5637 DiagnoseFunctionSpecifiers(D); 5638 5639 if (D.getDeclSpec().isThreadSpecified()) 5640 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5641 5642 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 5643 ForRedeclaration); 5644 5645 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5646 // Maybe we will complain about the shadowed template parameter. 5647 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5648 // Just pretend that we didn't see the previous declaration. 5649 PrevDecl = 0; 5650 } 5651 5652 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 5653 PrevDecl = 0; 5654 5655 bool Mutable 5656 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 5657 SourceLocation TSSL = D.getSourceRange().getBegin(); 5658 FieldDecl *NewFD 5659 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 5660 AS, PrevDecl, &D); 5661 5662 if (NewFD->isInvalidDecl()) 5663 Record->setInvalidDecl(); 5664 5665 if (NewFD->isInvalidDecl() && PrevDecl) { 5666 // Don't introduce NewFD into scope; there's already something 5667 // with the same name in the same scope. 5668 } else if (II) { 5669 PushOnScopeChains(NewFD, S); 5670 } else 5671 Record->addDecl(NewFD); 5672 5673 return NewFD; 5674} 5675 5676/// \brief Build a new FieldDecl and check its well-formedness. 5677/// 5678/// This routine builds a new FieldDecl given the fields name, type, 5679/// record, etc. \p PrevDecl should refer to any previous declaration 5680/// with the same name and in the same scope as the field to be 5681/// created. 5682/// 5683/// \returns a new FieldDecl. 5684/// 5685/// \todo The Declarator argument is a hack. It will be removed once 5686FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 5687 TypeSourceInfo *TInfo, 5688 RecordDecl *Record, SourceLocation Loc, 5689 bool Mutable, Expr *BitWidth, 5690 SourceLocation TSSL, 5691 AccessSpecifier AS, NamedDecl *PrevDecl, 5692 Declarator *D) { 5693 IdentifierInfo *II = Name.getAsIdentifierInfo(); 5694 bool InvalidDecl = false; 5695 if (D) InvalidDecl = D->isInvalidType(); 5696 5697 // If we receive a broken type, recover by assuming 'int' and 5698 // marking this declaration as invalid. 5699 if (T.isNull()) { 5700 InvalidDecl = true; 5701 T = Context.IntTy; 5702 } 5703 5704 QualType EltTy = Context.getBaseElementType(T); 5705 if (!EltTy->isDependentType() && 5706 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) 5707 InvalidDecl = true; 5708 5709 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5710 // than a variably modified type. 5711 if (!InvalidDecl && T->isVariablyModifiedType()) { 5712 bool SizeIsNegative; 5713 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 5714 SizeIsNegative); 5715 if (!FixedTy.isNull()) { 5716 Diag(Loc, diag::warn_illegal_constant_array_size); 5717 T = FixedTy; 5718 } else { 5719 if (SizeIsNegative) 5720 Diag(Loc, diag::err_typecheck_negative_array_size); 5721 else 5722 Diag(Loc, diag::err_typecheck_field_variable_size); 5723 InvalidDecl = true; 5724 } 5725 } 5726 5727 // Fields can not have abstract class types 5728 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 5729 diag::err_abstract_type_in_decl, 5730 AbstractFieldType)) 5731 InvalidDecl = true; 5732 5733 bool ZeroWidth = false; 5734 // If this is declared as a bit-field, check the bit-field. 5735 if (!InvalidDecl && BitWidth && 5736 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 5737 InvalidDecl = true; 5738 DeleteExpr(BitWidth); 5739 BitWidth = 0; 5740 ZeroWidth = false; 5741 } 5742 5743 // Check that 'mutable' is consistent with the type of the declaration. 5744 if (!InvalidDecl && Mutable) { 5745 unsigned DiagID = 0; 5746 if (T->isReferenceType()) 5747 DiagID = diag::err_mutable_reference; 5748 else if (T.isConstQualified()) 5749 DiagID = diag::err_mutable_const; 5750 5751 if (DiagID) { 5752 SourceLocation ErrLoc = Loc; 5753 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 5754 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 5755 Diag(ErrLoc, DiagID); 5756 Mutable = false; 5757 InvalidDecl = true; 5758 } 5759 } 5760 5761 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 5762 BitWidth, Mutable); 5763 if (InvalidDecl) 5764 NewFD->setInvalidDecl(); 5765 5766 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 5767 Diag(Loc, diag::err_duplicate_member) << II; 5768 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5769 NewFD->setInvalidDecl(); 5770 } 5771 5772 if (!InvalidDecl && getLangOptions().CPlusPlus) { 5773 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 5774 5775 if (!T->isPODType()) 5776 CXXRecord->setPOD(false); 5777 if (!ZeroWidth) 5778 CXXRecord->setEmpty(false); 5779 5780 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 5781 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 5782 5783 if (!RDecl->hasTrivialConstructor()) 5784 CXXRecord->setHasTrivialConstructor(false); 5785 if (!RDecl->hasTrivialCopyConstructor()) 5786 CXXRecord->setHasTrivialCopyConstructor(false); 5787 if (!RDecl->hasTrivialCopyAssignment()) 5788 CXXRecord->setHasTrivialCopyAssignment(false); 5789 if (!RDecl->hasTrivialDestructor()) 5790 CXXRecord->setHasTrivialDestructor(false); 5791 5792 // C++ 9.5p1: An object of a class with a non-trivial 5793 // constructor, a non-trivial copy constructor, a non-trivial 5794 // destructor, or a non-trivial copy assignment operator 5795 // cannot be a member of a union, nor can an array of such 5796 // objects. 5797 // TODO: C++0x alters this restriction significantly. 5798 if (Record->isUnion()) { 5799 // We check for copy constructors before constructors 5800 // because otherwise we'll never get complaints about 5801 // copy constructors. 5802 5803 CXXSpecialMember member = CXXInvalid; 5804 if (!RDecl->hasTrivialCopyConstructor()) 5805 member = CXXCopyConstructor; 5806 else if (!RDecl->hasTrivialConstructor()) 5807 member = CXXConstructor; 5808 else if (!RDecl->hasTrivialCopyAssignment()) 5809 member = CXXCopyAssignment; 5810 else if (!RDecl->hasTrivialDestructor()) 5811 member = CXXDestructor; 5812 5813 if (member != CXXInvalid) { 5814 Diag(Loc, diag::err_illegal_union_member) << Name << member; 5815 DiagnoseNontrivial(RT, member); 5816 NewFD->setInvalidDecl(); 5817 } 5818 } 5819 } 5820 } 5821 5822 // FIXME: We need to pass in the attributes given an AST 5823 // representation, not a parser representation. 5824 if (D) 5825 // FIXME: What to pass instead of TUScope? 5826 ProcessDeclAttributes(TUScope, NewFD, *D); 5827 5828 if (T.isObjCGCWeak()) 5829 Diag(Loc, diag::warn_attribute_weak_on_field); 5830 5831 NewFD->setAccess(AS); 5832 5833 // C++ [dcl.init.aggr]p1: 5834 // An aggregate is an array or a class (clause 9) with [...] no 5835 // private or protected non-static data members (clause 11). 5836 // A POD must be an aggregate. 5837 if (getLangOptions().CPlusPlus && 5838 (AS == AS_private || AS == AS_protected)) { 5839 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 5840 CXXRecord->setAggregate(false); 5841 CXXRecord->setPOD(false); 5842 } 5843 5844 return NewFD; 5845} 5846 5847/// DiagnoseNontrivial - Given that a class has a non-trivial 5848/// special member, figure out why. 5849void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 5850 QualType QT(T, 0U); 5851 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 5852 5853 // Check whether the member was user-declared. 5854 switch (member) { 5855 case CXXInvalid: 5856 break; 5857 5858 case CXXConstructor: 5859 if (RD->hasUserDeclaredConstructor()) { 5860 typedef CXXRecordDecl::ctor_iterator ctor_iter; 5861 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 5862 const FunctionDecl *body = 0; 5863 ci->getBody(body); 5864 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 5865 SourceLocation CtorLoc = ci->getLocation(); 5866 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5867 return; 5868 } 5869 } 5870 5871 assert(0 && "found no user-declared constructors"); 5872 return; 5873 } 5874 break; 5875 5876 case CXXCopyConstructor: 5877 if (RD->hasUserDeclaredCopyConstructor()) { 5878 SourceLocation CtorLoc = 5879 RD->getCopyConstructor(Context, 0)->getLocation(); 5880 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5881 return; 5882 } 5883 break; 5884 5885 case CXXCopyAssignment: 5886 if (RD->hasUserDeclaredCopyAssignment()) { 5887 // FIXME: this should use the location of the copy 5888 // assignment, not the type. 5889 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 5890 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 5891 return; 5892 } 5893 break; 5894 5895 case CXXDestructor: 5896 if (RD->hasUserDeclaredDestructor()) { 5897 SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation(); 5898 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5899 return; 5900 } 5901 break; 5902 } 5903 5904 typedef CXXRecordDecl::base_class_iterator base_iter; 5905 5906 // Virtual bases and members inhibit trivial copying/construction, 5907 // but not trivial destruction. 5908 if (member != CXXDestructor) { 5909 // Check for virtual bases. vbases includes indirect virtual bases, 5910 // so we just iterate through the direct bases. 5911 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 5912 if (bi->isVirtual()) { 5913 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5914 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 5915 return; 5916 } 5917 5918 // Check for virtual methods. 5919 typedef CXXRecordDecl::method_iterator meth_iter; 5920 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 5921 ++mi) { 5922 if (mi->isVirtual()) { 5923 SourceLocation MLoc = mi->getSourceRange().getBegin(); 5924 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 5925 return; 5926 } 5927 } 5928 } 5929 5930 bool (CXXRecordDecl::*hasTrivial)() const; 5931 switch (member) { 5932 case CXXConstructor: 5933 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 5934 case CXXCopyConstructor: 5935 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 5936 case CXXCopyAssignment: 5937 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 5938 case CXXDestructor: 5939 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 5940 default: 5941 assert(0 && "unexpected special member"); return; 5942 } 5943 5944 // Check for nontrivial bases (and recurse). 5945 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 5946 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 5947 assert(BaseRT && "Don't know how to handle dependent bases"); 5948 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 5949 if (!(BaseRecTy->*hasTrivial)()) { 5950 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5951 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 5952 DiagnoseNontrivial(BaseRT, member); 5953 return; 5954 } 5955 } 5956 5957 // Check for nontrivial members (and recurse). 5958 typedef RecordDecl::field_iterator field_iter; 5959 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 5960 ++fi) { 5961 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 5962 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 5963 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 5964 5965 if (!(EltRD->*hasTrivial)()) { 5966 SourceLocation FLoc = (*fi)->getLocation(); 5967 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 5968 DiagnoseNontrivial(EltRT, member); 5969 return; 5970 } 5971 } 5972 } 5973 5974 assert(0 && "found no explanation for non-trivial member"); 5975} 5976 5977/// TranslateIvarVisibility - Translate visibility from a token ID to an 5978/// AST enum value. 5979static ObjCIvarDecl::AccessControl 5980TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 5981 switch (ivarVisibility) { 5982 default: assert(0 && "Unknown visitibility kind"); 5983 case tok::objc_private: return ObjCIvarDecl::Private; 5984 case tok::objc_public: return ObjCIvarDecl::Public; 5985 case tok::objc_protected: return ObjCIvarDecl::Protected; 5986 case tok::objc_package: return ObjCIvarDecl::Package; 5987 } 5988} 5989 5990/// ActOnIvar - Each ivar field of an objective-c class is passed into this 5991/// in order to create an IvarDecl object for it. 5992Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 5993 SourceLocation DeclStart, 5994 DeclPtrTy IntfDecl, 5995 Declarator &D, ExprTy *BitfieldWidth, 5996 tok::ObjCKeywordKind Visibility) { 5997 5998 IdentifierInfo *II = D.getIdentifier(); 5999 Expr *BitWidth = (Expr*)BitfieldWidth; 6000 SourceLocation Loc = DeclStart; 6001 if (II) Loc = D.getIdentifierLoc(); 6002 6003 // FIXME: Unnamed fields can be handled in various different ways, for 6004 // example, unnamed unions inject all members into the struct namespace! 6005 6006 TypeSourceInfo *TInfo = 0; 6007 QualType T = GetTypeForDeclarator(D, S, &TInfo); 6008 6009 if (BitWidth) { 6010 // 6.7.2.1p3, 6.7.2.1p4 6011 if (VerifyBitField(Loc, II, T, BitWidth)) { 6012 D.setInvalidType(); 6013 DeleteExpr(BitWidth); 6014 BitWidth = 0; 6015 } 6016 } else { 6017 // Not a bitfield. 6018 6019 // validate II. 6020 6021 } 6022 if (T->isReferenceType()) { 6023 Diag(Loc, diag::err_ivar_reference_type); 6024 D.setInvalidType(); 6025 } 6026 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6027 // than a variably modified type. 6028 else if (T->isVariablyModifiedType()) { 6029 Diag(Loc, diag::err_typecheck_ivar_variable_size); 6030 D.setInvalidType(); 6031 } 6032 6033 // Get the visibility (access control) for this ivar. 6034 ObjCIvarDecl::AccessControl ac = 6035 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 6036 : ObjCIvarDecl::None; 6037 // Must set ivar's DeclContext to its enclosing interface. 6038 ObjCContainerDecl *EnclosingDecl = IntfDecl.getAs<ObjCContainerDecl>(); 6039 ObjCContainerDecl *EnclosingContext; 6040 if (ObjCImplementationDecl *IMPDecl = 6041 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6042 // Case of ivar declared in an implementation. Context is that of its class. 6043 EnclosingContext = IMPDecl->getClassInterface(); 6044 assert(EnclosingContext && "Implementation has no class interface!"); 6045 } else { 6046 if (ObjCCategoryDecl *CDecl = 6047 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6048 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 6049 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 6050 return DeclPtrTy(); 6051 } 6052 } 6053 EnclosingContext = EnclosingDecl; 6054 } 6055 6056 // Construct the decl. 6057 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 6058 EnclosingContext, Loc, II, T, 6059 TInfo, ac, (Expr *)BitfieldWidth); 6060 6061 if (II) { 6062 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 6063 ForRedeclaration); 6064 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 6065 && !isa<TagDecl>(PrevDecl)) { 6066 Diag(Loc, diag::err_duplicate_member) << II; 6067 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6068 NewID->setInvalidDecl(); 6069 } 6070 } 6071 6072 // Process attributes attached to the ivar. 6073 ProcessDeclAttributes(S, NewID, D); 6074 6075 if (D.isInvalidType()) 6076 NewID->setInvalidDecl(); 6077 6078 if (II) { 6079 // FIXME: When interfaces are DeclContexts, we'll need to add 6080 // these to the interface. 6081 S->AddDecl(DeclPtrTy::make(NewID)); 6082 IdResolver.AddDecl(NewID); 6083 } 6084 6085 return DeclPtrTy::make(NewID); 6086} 6087 6088void Sema::ActOnFields(Scope* S, 6089 SourceLocation RecLoc, DeclPtrTy RecDecl, 6090 DeclPtrTy *Fields, unsigned NumFields, 6091 SourceLocation LBrac, SourceLocation RBrac, 6092 AttributeList *Attr) { 6093 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 6094 assert(EnclosingDecl && "missing record or interface decl"); 6095 6096 // If the decl this is being inserted into is invalid, then it may be a 6097 // redeclaration or some other bogus case. Don't try to add fields to it. 6098 if (EnclosingDecl->isInvalidDecl()) { 6099 // FIXME: Deallocate fields? 6100 return; 6101 } 6102 6103 6104 // Verify that all the fields are okay. 6105 unsigned NumNamedMembers = 0; 6106 llvm::SmallVector<FieldDecl*, 32> RecFields; 6107 6108 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 6109 for (unsigned i = 0; i != NumFields; ++i) { 6110 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 6111 6112 // Get the type for the field. 6113 Type *FDTy = FD->getType().getTypePtr(); 6114 6115 if (!FD->isAnonymousStructOrUnion()) { 6116 // Remember all fields written by the user. 6117 RecFields.push_back(FD); 6118 } 6119 6120 // If the field is already invalid for some reason, don't emit more 6121 // diagnostics about it. 6122 if (FD->isInvalidDecl()) { 6123 EnclosingDecl->setInvalidDecl(); 6124 continue; 6125 } 6126 6127 // C99 6.7.2.1p2: 6128 // A structure or union shall not contain a member with 6129 // incomplete or function type (hence, a structure shall not 6130 // contain an instance of itself, but may contain a pointer to 6131 // an instance of itself), except that the last member of a 6132 // structure with more than one named member may have incomplete 6133 // array type; such a structure (and any union containing, 6134 // possibly recursively, a member that is such a structure) 6135 // shall not be a member of a structure or an element of an 6136 // array. 6137 if (FDTy->isFunctionType()) { 6138 // Field declared as a function. 6139 Diag(FD->getLocation(), diag::err_field_declared_as_function) 6140 << FD->getDeclName(); 6141 FD->setInvalidDecl(); 6142 EnclosingDecl->setInvalidDecl(); 6143 continue; 6144 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 6145 Record && Record->isStruct()) { 6146 // Flexible array member. 6147 if (NumNamedMembers < 1) { 6148 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 6149 << FD->getDeclName(); 6150 FD->setInvalidDecl(); 6151 EnclosingDecl->setInvalidDecl(); 6152 continue; 6153 } 6154 if (!FD->getType()->isDependentType() && 6155 !Context.getBaseElementType(FD->getType())->isPODType()) { 6156 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 6157 << FD->getDeclName() << FD->getType(); 6158 FD->setInvalidDecl(); 6159 EnclosingDecl->setInvalidDecl(); 6160 continue; 6161 } 6162 6163 // Okay, we have a legal flexible array member at the end of the struct. 6164 if (Record) 6165 Record->setHasFlexibleArrayMember(true); 6166 } else if (!FDTy->isDependentType() && 6167 RequireCompleteType(FD->getLocation(), FD->getType(), 6168 diag::err_field_incomplete)) { 6169 // Incomplete type 6170 FD->setInvalidDecl(); 6171 EnclosingDecl->setInvalidDecl(); 6172 continue; 6173 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 6174 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 6175 // If this is a member of a union, then entire union becomes "flexible". 6176 if (Record && Record->isUnion()) { 6177 Record->setHasFlexibleArrayMember(true); 6178 } else { 6179 // If this is a struct/class and this is not the last element, reject 6180 // it. Note that GCC supports variable sized arrays in the middle of 6181 // structures. 6182 if (i != NumFields-1) 6183 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 6184 << FD->getDeclName() << FD->getType(); 6185 else { 6186 // We support flexible arrays at the end of structs in 6187 // other structs as an extension. 6188 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 6189 << FD->getDeclName(); 6190 if (Record) 6191 Record->setHasFlexibleArrayMember(true); 6192 } 6193 } 6194 } 6195 if (Record && FDTTy->getDecl()->hasObjectMember()) 6196 Record->setHasObjectMember(true); 6197 } else if (FDTy->isObjCObjectType()) { 6198 /// A field cannot be an Objective-c object 6199 Diag(FD->getLocation(), diag::err_statically_allocated_object); 6200 FD->setInvalidDecl(); 6201 EnclosingDecl->setInvalidDecl(); 6202 continue; 6203 } else if (getLangOptions().ObjC1 && 6204 getLangOptions().getGCMode() != LangOptions::NonGC && 6205 Record && 6206 (FD->getType()->isObjCObjectPointerType() || 6207 FD->getType().isObjCGCStrong())) 6208 Record->setHasObjectMember(true); 6209 // Keep track of the number of named members. 6210 if (FD->getIdentifier()) 6211 ++NumNamedMembers; 6212 } 6213 6214 // Okay, we successfully defined 'Record'. 6215 if (Record) { 6216 Record->completeDefinition(); 6217 } else { 6218 ObjCIvarDecl **ClsFields = 6219 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 6220 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 6221 ID->setLocEnd(RBrac); 6222 // Add ivar's to class's DeclContext. 6223 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6224 ClsFields[i]->setLexicalDeclContext(ID); 6225 ID->addDecl(ClsFields[i]); 6226 } 6227 // Must enforce the rule that ivars in the base classes may not be 6228 // duplicates. 6229 if (ID->getSuperClass()) 6230 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 6231 } else if (ObjCImplementationDecl *IMPDecl = 6232 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6233 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 6234 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 6235 // Ivar declared in @implementation never belongs to the implementation. 6236 // Only it is in implementation's lexical context. 6237 ClsFields[I]->setLexicalDeclContext(IMPDecl); 6238 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 6239 } else if (ObjCCategoryDecl *CDecl = 6240 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6241 // case of ivars in class extension; all other cases have been 6242 // reported as errors elsewhere. 6243 // FIXME. Class extension does not have a LocEnd field. 6244 // CDecl->setLocEnd(RBrac); 6245 // Add ivar's to class extension's DeclContext. 6246 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6247 ClsFields[i]->setLexicalDeclContext(CDecl); 6248 CDecl->addDecl(ClsFields[i]); 6249 } 6250 } 6251 } 6252 6253 if (Attr) 6254 ProcessDeclAttributeList(S, Record, Attr); 6255} 6256 6257/// \brief Determine whether the given integral value is representable within 6258/// the given type T. 6259static bool isRepresentableIntegerValue(ASTContext &Context, 6260 llvm::APSInt &Value, 6261 QualType T) { 6262 assert(T->isIntegralType() && "Integral type required!"); 6263 unsigned BitWidth = Context.getIntWidth(T); 6264 6265 if (Value.isUnsigned() || Value.isNonNegative()) 6266 return Value.getActiveBits() < BitWidth; 6267 6268 return Value.getMinSignedBits() <= BitWidth; 6269} 6270 6271// \brief Given an integral type, return the next larger integral type 6272// (or a NULL type of no such type exists). 6273static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 6274 // FIXME: Int128/UInt128 support, which also needs to be introduced into 6275 // enum checking below. 6276 assert(T->isIntegralType() && "Integral type required!"); 6277 const unsigned NumTypes = 4; 6278 QualType SignedIntegralTypes[NumTypes] = { 6279 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 6280 }; 6281 QualType UnsignedIntegralTypes[NumTypes] = { 6282 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 6283 Context.UnsignedLongLongTy 6284 }; 6285 6286 unsigned BitWidth = Context.getTypeSize(T); 6287 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 6288 : UnsignedIntegralTypes; 6289 for (unsigned I = 0; I != NumTypes; ++I) 6290 if (Context.getTypeSize(Types[I]) > BitWidth) 6291 return Types[I]; 6292 6293 return QualType(); 6294} 6295 6296EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 6297 EnumConstantDecl *LastEnumConst, 6298 SourceLocation IdLoc, 6299 IdentifierInfo *Id, 6300 ExprArg val) { 6301 Expr *Val = (Expr *)val.get(); 6302 6303 unsigned IntWidth = Context.Target.getIntWidth(); 6304 llvm::APSInt EnumVal(IntWidth); 6305 QualType EltTy; 6306 if (Val) { 6307 if (Enum->isDependentType() || Val->isTypeDependent()) 6308 EltTy = Context.DependentTy; 6309 else { 6310 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 6311 SourceLocation ExpLoc; 6312 if (!Val->isValueDependent() && 6313 VerifyIntegerConstantExpression(Val, &EnumVal)) { 6314 Val = 0; 6315 } else { 6316 if (!getLangOptions().CPlusPlus) { 6317 // C99 6.7.2.2p2: 6318 // The expression that defines the value of an enumeration constant 6319 // shall be an integer constant expression that has a value 6320 // representable as an int. 6321 6322 // Complain if the value is not representable in an int. 6323 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 6324 Diag(IdLoc, diag::ext_enum_value_not_int) 6325 << EnumVal.toString(10) << Val->getSourceRange() 6326 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 6327 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 6328 // Force the type of the expression to 'int'. 6329 ImpCastExprToType(Val, Context.IntTy, CastExpr::CK_IntegralCast); 6330 6331 if (Val != val.get()) { 6332 val.release(); 6333 val = Val; 6334 } 6335 } 6336 } 6337 6338 // C++0x [dcl.enum]p5: 6339 // If the underlying type is not fixed, the type of each enumerator 6340 // is the type of its initializing value: 6341 // - If an initializer is specified for an enumerator, the 6342 // initializing value has the same type as the expression. 6343 EltTy = Val->getType(); 6344 } 6345 } 6346 } 6347 6348 if (!Val) { 6349 if (Enum->isDependentType()) 6350 EltTy = Context.DependentTy; 6351 else if (!LastEnumConst) { 6352 // C++0x [dcl.enum]p5: 6353 // If the underlying type is not fixed, the type of each enumerator 6354 // is the type of its initializing value: 6355 // - If no initializer is specified for the first enumerator, the 6356 // initializing value has an unspecified integral type. 6357 // 6358 // GCC uses 'int' for its unspecified integral type, as does 6359 // C99 6.7.2.2p3. 6360 EltTy = Context.IntTy; 6361 } else { 6362 // Assign the last value + 1. 6363 EnumVal = LastEnumConst->getInitVal(); 6364 ++EnumVal; 6365 EltTy = LastEnumConst->getType(); 6366 6367 // Check for overflow on increment. 6368 if (EnumVal < LastEnumConst->getInitVal()) { 6369 // C++0x [dcl.enum]p5: 6370 // If the underlying type is not fixed, the type of each enumerator 6371 // is the type of its initializing value: 6372 // 6373 // - Otherwise the type of the initializing value is the same as 6374 // the type of the initializing value of the preceding enumerator 6375 // unless the incremented value is not representable in that type, 6376 // in which case the type is an unspecified integral type 6377 // sufficient to contain the incremented value. If no such type 6378 // exists, the program is ill-formed. 6379 QualType T = getNextLargerIntegralType(Context, EltTy); 6380 if (T.isNull()) { 6381 // There is no integral type larger enough to represent this 6382 // value. Complain, then allow the value to wrap around. 6383 EnumVal = LastEnumConst->getInitVal(); 6384 EnumVal.zext(EnumVal.getBitWidth() * 2); 6385 Diag(IdLoc, diag::warn_enumerator_too_large) 6386 << EnumVal.toString(10); 6387 } else { 6388 EltTy = T; 6389 } 6390 6391 // Retrieve the last enumerator's value, extent that type to the 6392 // type that is supposed to be large enough to represent the incremented 6393 // value, then increment. 6394 EnumVal = LastEnumConst->getInitVal(); 6395 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6396 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 6397 ++EnumVal; 6398 6399 // If we're not in C++, diagnose the overflow of enumerator values, 6400 // which in C99 means that the enumerator value is not representable in 6401 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 6402 // permits enumerator values that are representable in some larger 6403 // integral type. 6404 if (!getLangOptions().CPlusPlus && !T.isNull()) 6405 Diag(IdLoc, diag::warn_enum_value_overflow); 6406 } else if (!getLangOptions().CPlusPlus && 6407 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 6408 // Enforce C99 6.7.2.2p2 even when we compute the next value. 6409 Diag(IdLoc, diag::ext_enum_value_not_int) 6410 << EnumVal.toString(10) << 1; 6411 } 6412 } 6413 } 6414 6415 if (!EltTy->isDependentType()) { 6416 // Make the enumerator value match the signedness and size of the 6417 // enumerator's type. 6418 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 6419 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6420 } 6421 6422 val.release(); 6423 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 6424 Val, EnumVal); 6425} 6426 6427 6428Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 6429 DeclPtrTy lastEnumConst, 6430 SourceLocation IdLoc, 6431 IdentifierInfo *Id, 6432 SourceLocation EqualLoc, ExprTy *val) { 6433 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 6434 EnumConstantDecl *LastEnumConst = 6435 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 6436 Expr *Val = static_cast<Expr*>(val); 6437 6438 // The scope passed in may not be a decl scope. Zip up the scope tree until 6439 // we find one that is. 6440 S = getNonFieldDeclScope(S); 6441 6442 // Verify that there isn't already something declared with this name in this 6443 // scope. 6444 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 6445 ForRedeclaration); 6446 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6447 // Maybe we will complain about the shadowed template parameter. 6448 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 6449 // Just pretend that we didn't see the previous declaration. 6450 PrevDecl = 0; 6451 } 6452 6453 if (PrevDecl) { 6454 // When in C++, we may get a TagDecl with the same name; in this case the 6455 // enum constant will 'hide' the tag. 6456 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 6457 "Received TagDecl when not in C++!"); 6458 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 6459 if (isa<EnumConstantDecl>(PrevDecl)) 6460 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 6461 else 6462 Diag(IdLoc, diag::err_redefinition) << Id; 6463 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6464 if (Val) Val->Destroy(Context); 6465 return DeclPtrTy(); 6466 } 6467 } 6468 6469 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 6470 IdLoc, Id, Owned(Val)); 6471 6472 // Register this decl in the current scope stack. 6473 if (New) { 6474 New->setAccess(TheEnumDecl->getAccess()); 6475 PushOnScopeChains(New, S); 6476 } 6477 6478 return DeclPtrTy::make(New); 6479} 6480 6481void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 6482 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 6483 DeclPtrTy *Elements, unsigned NumElements, 6484 Scope *S, AttributeList *Attr) { 6485 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 6486 QualType EnumType = Context.getTypeDeclType(Enum); 6487 6488 if (Attr) 6489 ProcessDeclAttributeList(S, Enum, Attr); 6490 6491 if (Enum->isDependentType()) { 6492 for (unsigned i = 0; i != NumElements; ++i) { 6493 EnumConstantDecl *ECD = 6494 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6495 if (!ECD) continue; 6496 6497 ECD->setType(EnumType); 6498 } 6499 6500 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 6501 return; 6502 } 6503 6504 // TODO: If the result value doesn't fit in an int, it must be a long or long 6505 // long value. ISO C does not support this, but GCC does as an extension, 6506 // emit a warning. 6507 unsigned IntWidth = Context.Target.getIntWidth(); 6508 unsigned CharWidth = Context.Target.getCharWidth(); 6509 unsigned ShortWidth = Context.Target.getShortWidth(); 6510 6511 // Verify that all the values are okay, compute the size of the values, and 6512 // reverse the list. 6513 unsigned NumNegativeBits = 0; 6514 unsigned NumPositiveBits = 0; 6515 6516 // Keep track of whether all elements have type int. 6517 bool AllElementsInt = true; 6518 6519 for (unsigned i = 0; i != NumElements; ++i) { 6520 EnumConstantDecl *ECD = 6521 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6522 if (!ECD) continue; // Already issued a diagnostic. 6523 6524 const llvm::APSInt &InitVal = ECD->getInitVal(); 6525 6526 // Keep track of the size of positive and negative values. 6527 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 6528 NumPositiveBits = std::max(NumPositiveBits, 6529 (unsigned)InitVal.getActiveBits()); 6530 else 6531 NumNegativeBits = std::max(NumNegativeBits, 6532 (unsigned)InitVal.getMinSignedBits()); 6533 6534 // Keep track of whether every enum element has type int (very commmon). 6535 if (AllElementsInt) 6536 AllElementsInt = ECD->getType() == Context.IntTy; 6537 } 6538 6539 // Figure out the type that should be used for this enum. 6540 // FIXME: Support -fshort-enums. 6541 QualType BestType; 6542 unsigned BestWidth; 6543 6544 // C++0x N3000 [conv.prom]p3: 6545 // An rvalue of an unscoped enumeration type whose underlying 6546 // type is not fixed can be converted to an rvalue of the first 6547 // of the following types that can represent all the values of 6548 // the enumeration: int, unsigned int, long int, unsigned long 6549 // int, long long int, or unsigned long long int. 6550 // C99 6.4.4.3p2: 6551 // An identifier declared as an enumeration constant has type int. 6552 // The C99 rule is modified by a gcc extension 6553 QualType BestPromotionType; 6554 6555 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 6556 6557 if (NumNegativeBits) { 6558 // If there is a negative value, figure out the smallest integer type (of 6559 // int/long/longlong) that fits. 6560 // If it's packed, check also if it fits a char or a short. 6561 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 6562 BestType = Context.SignedCharTy; 6563 BestWidth = CharWidth; 6564 } else if (Packed && NumNegativeBits <= ShortWidth && 6565 NumPositiveBits < ShortWidth) { 6566 BestType = Context.ShortTy; 6567 BestWidth = ShortWidth; 6568 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 6569 BestType = Context.IntTy; 6570 BestWidth = IntWidth; 6571 } else { 6572 BestWidth = Context.Target.getLongWidth(); 6573 6574 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 6575 BestType = Context.LongTy; 6576 } else { 6577 BestWidth = Context.Target.getLongLongWidth(); 6578 6579 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 6580 Diag(Enum->getLocation(), diag::warn_enum_too_large); 6581 BestType = Context.LongLongTy; 6582 } 6583 } 6584 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 6585 } else { 6586 // If there is no negative value, figure out the smallest type that fits 6587 // all of the enumerator values. 6588 // If it's packed, check also if it fits a char or a short. 6589 if (Packed && NumPositiveBits <= CharWidth) { 6590 BestType = Context.UnsignedCharTy; 6591 BestPromotionType = Context.IntTy; 6592 BestWidth = CharWidth; 6593 } else if (Packed && NumPositiveBits <= ShortWidth) { 6594 BestType = Context.UnsignedShortTy; 6595 BestPromotionType = Context.IntTy; 6596 BestWidth = ShortWidth; 6597 } else if (NumPositiveBits <= IntWidth) { 6598 BestType = Context.UnsignedIntTy; 6599 BestWidth = IntWidth; 6600 BestPromotionType 6601 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6602 ? Context.UnsignedIntTy : Context.IntTy; 6603 } else if (NumPositiveBits <= 6604 (BestWidth = Context.Target.getLongWidth())) { 6605 BestType = Context.UnsignedLongTy; 6606 BestPromotionType 6607 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6608 ? Context.UnsignedLongTy : Context.LongTy; 6609 } else { 6610 BestWidth = Context.Target.getLongLongWidth(); 6611 assert(NumPositiveBits <= BestWidth && 6612 "How could an initializer get larger than ULL?"); 6613 BestType = Context.UnsignedLongLongTy; 6614 BestPromotionType 6615 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6616 ? Context.UnsignedLongLongTy : Context.LongLongTy; 6617 } 6618 } 6619 6620 // Loop over all of the enumerator constants, changing their types to match 6621 // the type of the enum if needed. 6622 for (unsigned i = 0; i != NumElements; ++i) { 6623 EnumConstantDecl *ECD = 6624 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6625 if (!ECD) continue; // Already issued a diagnostic. 6626 6627 // Standard C says the enumerators have int type, but we allow, as an 6628 // extension, the enumerators to be larger than int size. If each 6629 // enumerator value fits in an int, type it as an int, otherwise type it the 6630 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 6631 // that X has type 'int', not 'unsigned'. 6632 6633 // Determine whether the value fits into an int. 6634 llvm::APSInt InitVal = ECD->getInitVal(); 6635 6636 // If it fits into an integer type, force it. Otherwise force it to match 6637 // the enum decl type. 6638 QualType NewTy; 6639 unsigned NewWidth; 6640 bool NewSign; 6641 if (!getLangOptions().CPlusPlus && 6642 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 6643 NewTy = Context.IntTy; 6644 NewWidth = IntWidth; 6645 NewSign = true; 6646 } else if (ECD->getType() == BestType) { 6647 // Already the right type! 6648 if (getLangOptions().CPlusPlus) 6649 // C++ [dcl.enum]p4: Following the closing brace of an 6650 // enum-specifier, each enumerator has the type of its 6651 // enumeration. 6652 ECD->setType(EnumType); 6653 continue; 6654 } else { 6655 NewTy = BestType; 6656 NewWidth = BestWidth; 6657 NewSign = BestType->isSignedIntegerType(); 6658 } 6659 6660 // Adjust the APSInt value. 6661 InitVal.extOrTrunc(NewWidth); 6662 InitVal.setIsSigned(NewSign); 6663 ECD->setInitVal(InitVal); 6664 6665 // Adjust the Expr initializer and type. 6666 if (ECD->getInitExpr()) 6667 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, 6668 CastExpr::CK_IntegralCast, 6669 ECD->getInitExpr(), 6670 CXXBaseSpecifierArray(), 6671 /*isLvalue=*/false)); 6672 if (getLangOptions().CPlusPlus) 6673 // C++ [dcl.enum]p4: Following the closing brace of an 6674 // enum-specifier, each enumerator has the type of its 6675 // enumeration. 6676 ECD->setType(EnumType); 6677 else 6678 ECD->setType(NewTy); 6679 } 6680 6681 Enum->completeDefinition(BestType, BestPromotionType, 6682 NumPositiveBits, NumNegativeBits); 6683} 6684 6685Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 6686 ExprArg expr) { 6687 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 6688 6689 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 6690 Loc, AsmString); 6691 CurContext->addDecl(New); 6692 return DeclPtrTy::make(New); 6693} 6694 6695void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 6696 SourceLocation PragmaLoc, 6697 SourceLocation NameLoc) { 6698 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 6699 6700 if (PrevDecl) { 6701 PrevDecl->addAttr(::new (Context) WeakAttr()); 6702 } else { 6703 (void)WeakUndeclaredIdentifiers.insert( 6704 std::pair<IdentifierInfo*,WeakInfo> 6705 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 6706 } 6707} 6708 6709void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 6710 IdentifierInfo* AliasName, 6711 SourceLocation PragmaLoc, 6712 SourceLocation NameLoc, 6713 SourceLocation AliasNameLoc) { 6714 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 6715 LookupOrdinaryName); 6716 WeakInfo W = WeakInfo(Name, NameLoc); 6717 6718 if (PrevDecl) { 6719 if (!PrevDecl->hasAttr<AliasAttr>()) 6720 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 6721 DeclApplyPragmaWeak(TUScope, ND, W); 6722 } else { 6723 (void)WeakUndeclaredIdentifiers.insert( 6724 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 6725 } 6726} 6727