SemaDecl.cpp revision d97cec3deb6e34f0f9d4f5f8ec11b28e44812727
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 "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/Sema/CXXFieldCollector.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "TypeLocBuilder.h" 21#include "clang/AST/APValue.h" 22#include "clang/AST/ASTConsumer.h" 23#include "clang/AST/ASTContext.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclCXX.h" 26#include "clang/AST/DeclObjC.h" 27#include "clang/AST/DeclTemplate.h" 28#include "clang/AST/ExprCXX.h" 29#include "clang/AST/StmtCXX.h" 30#include "clang/AST/CharUnits.h" 31#include "clang/Sema/DeclSpec.h" 32#include "clang/Sema/ParsedTemplate.h" 33#include "clang/Parse/ParseDiagnostic.h" 34#include "clang/Basic/PartialDiagnostic.h" 35#include "clang/Basic/SourceManager.h" 36#include "clang/Basic/TargetInfo.h" 37// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 38#include "clang/Lex/Preprocessor.h" 39#include "clang/Lex/HeaderSearch.h" 40#include "llvm/ADT/Triple.h" 41#include <algorithm> 42#include <cstring> 43#include <functional> 44using namespace clang; 45using namespace sema; 46 47Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr) { 48 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 49} 50 51/// \brief If the identifier refers to a type name within this scope, 52/// return the declaration of that type. 53/// 54/// This routine performs ordinary name lookup of the identifier II 55/// within the given scope, with optional C++ scope specifier SS, to 56/// determine whether the name refers to a type. If so, returns an 57/// opaque pointer (actually a QualType) corresponding to that 58/// type. Otherwise, returns NULL. 59/// 60/// If name lookup results in an ambiguity, this routine will complain 61/// and then return NULL. 62ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 63 Scope *S, CXXScopeSpec *SS, 64 bool isClassName, bool HasTrailingDot, 65 ParsedType ObjectTypePtr, 66 bool WantNontrivialTypeSourceInfo) { 67 // Determine where we will perform name lookup. 68 DeclContext *LookupCtx = 0; 69 if (ObjectTypePtr) { 70 QualType ObjectType = ObjectTypePtr.get(); 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 ParsedType(); 89 90 // We know from the grammar that this name refers to a type, 91 // so build a dependent node to describe the type. 92 if (WantNontrivialTypeSourceInfo) 93 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 94 95 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 96 QualType T = 97 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 98 II, NameLoc); 99 100 return ParsedType::make(T); 101 } 102 103 return ParsedType(); 104 } 105 106 if (!LookupCtx->isDependentContext() && 107 RequireCompleteDeclContext(*SS, LookupCtx)) 108 return ParsedType(); 109 } 110 111 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 112 // lookup for class-names. 113 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 114 LookupOrdinaryName; 115 LookupResult Result(*this, &II, NameLoc, Kind); 116 if (LookupCtx) { 117 // Perform "qualified" name lookup into the declaration context we 118 // computed, which is either the type of the base of a member access 119 // expression or the declaration context associated with a prior 120 // nested-name-specifier. 121 LookupQualifiedName(Result, LookupCtx); 122 123 if (ObjectTypePtr && Result.empty()) { 124 // C++ [basic.lookup.classref]p3: 125 // If the unqualified-id is ~type-name, the type-name is looked up 126 // in the context of the entire postfix-expression. If the type T of 127 // the object expression is of a class type C, the type-name is also 128 // looked up in the scope of class C. At least one of the lookups shall 129 // find a name that refers to (possibly cv-qualified) T. 130 LookupName(Result, S); 131 } 132 } else { 133 // Perform unqualified name lookup. 134 LookupName(Result, S); 135 } 136 137 NamedDecl *IIDecl = 0; 138 switch (Result.getResultKind()) { 139 case LookupResult::NotFound: 140 case LookupResult::NotFoundInCurrentInstantiation: 141 case LookupResult::FoundOverloaded: 142 case LookupResult::FoundUnresolvedValue: 143 Result.suppressDiagnostics(); 144 return ParsedType(); 145 146 case LookupResult::Ambiguous: 147 // Recover from type-hiding ambiguities by hiding the type. We'll 148 // do the lookup again when looking for an object, and we can 149 // diagnose the error then. If we don't do this, then the error 150 // about hiding the type will be immediately followed by an error 151 // that only makes sense if the identifier was treated like a type. 152 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 153 Result.suppressDiagnostics(); 154 return ParsedType(); 155 } 156 157 // Look to see if we have a type anywhere in the list of results. 158 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 159 Res != ResEnd; ++Res) { 160 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 161 if (!IIDecl || 162 (*Res)->getLocation().getRawEncoding() < 163 IIDecl->getLocation().getRawEncoding()) 164 IIDecl = *Res; 165 } 166 } 167 168 if (!IIDecl) { 169 // None of the entities we found is a type, so there is no way 170 // to even assume that the result is a type. In this case, don't 171 // complain about the ambiguity. The parser will either try to 172 // perform this lookup again (e.g., as an object name), which 173 // will produce the ambiguity, or will complain that it expected 174 // a type name. 175 Result.suppressDiagnostics(); 176 return ParsedType(); 177 } 178 179 // We found a type within the ambiguous lookup; diagnose the 180 // ambiguity and then return that type. This might be the right 181 // answer, or it might not be, but it suppresses any attempt to 182 // perform the name lookup again. 183 break; 184 185 case LookupResult::Found: 186 IIDecl = Result.getFoundDecl(); 187 break; 188 } 189 190 assert(IIDecl && "Didn't find decl"); 191 192 QualType T; 193 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 194 DiagnoseUseOfDecl(IIDecl, NameLoc); 195 196 if (T.isNull()) 197 T = Context.getTypeDeclType(TD); 198 199 if (SS && SS->isNotEmpty()) { 200 if (WantNontrivialTypeSourceInfo) { 201 // Construct a type with type-source information. 202 TypeLocBuilder Builder; 203 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 204 205 T = getElaboratedType(ETK_None, *SS, T); 206 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 207 ElabTL.setKeywordLoc(SourceLocation()); 208 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 209 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 210 } else { 211 T = getElaboratedType(ETK_None, *SS, T); 212 } 213 } 214 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 215 if (!HasTrailingDot) 216 T = Context.getObjCInterfaceType(IDecl); 217 } 218 219 if (T.isNull()) { 220 // If it's not plausibly a type, suppress diagnostics. 221 Result.suppressDiagnostics(); 222 return ParsedType(); 223 } 224 return ParsedType::make(T); 225} 226 227/// isTagName() - This method is called *for error recovery purposes only* 228/// to determine if the specified name is a valid tag name ("struct foo"). If 229/// so, this returns the TST for the tag corresponding to it (TST_enum, 230/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 231/// where the user forgot to specify the tag. 232DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 233 // Do a tag name lookup in this scope. 234 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 235 LookupName(R, S, false); 236 R.suppressDiagnostics(); 237 if (R.getResultKind() == LookupResult::Found) 238 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 239 switch (TD->getTagKind()) { 240 default: return DeclSpec::TST_unspecified; 241 case TTK_Struct: return DeclSpec::TST_struct; 242 case TTK_Union: return DeclSpec::TST_union; 243 case TTK_Class: return DeclSpec::TST_class; 244 case TTK_Enum: return DeclSpec::TST_enum; 245 } 246 } 247 248 return DeclSpec::TST_unspecified; 249} 250 251bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 252 SourceLocation IILoc, 253 Scope *S, 254 CXXScopeSpec *SS, 255 ParsedType &SuggestedType) { 256 // We don't have anything to suggest (yet). 257 SuggestedType = ParsedType(); 258 259 // There may have been a typo in the name of the type. Look up typo 260 // results, in case we have something that we can suggest. 261 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 262 NotForRedeclaration); 263 264 if (DeclarationName Corrected = CorrectTypo(Lookup, S, SS, 0, 0, CTC_Type)) { 265 if (NamedDecl *Result = Lookup.getAsSingle<NamedDecl>()) { 266 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 267 !Result->isInvalidDecl()) { 268 // We found a similarly-named type or interface; suggest that. 269 if (!SS || !SS->isSet()) 270 Diag(IILoc, diag::err_unknown_typename_suggest) 271 << &II << Lookup.getLookupName() 272 << FixItHint::CreateReplacement(SourceRange(IILoc), 273 Result->getNameAsString()); 274 else if (DeclContext *DC = computeDeclContext(*SS, false)) 275 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 276 << &II << DC << Lookup.getLookupName() << SS->getRange() 277 << FixItHint::CreateReplacement(SourceRange(IILoc), 278 Result->getNameAsString()); 279 else 280 llvm_unreachable("could not have corrected a typo here"); 281 282 Diag(Result->getLocation(), diag::note_previous_decl) 283 << Result->getDeclName(); 284 285 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 286 false, false, ParsedType(), 287 /*NonTrivialTypeSourceInfo=*/true); 288 return true; 289 } 290 } else if (Lookup.empty()) { 291 // We corrected to a keyword. 292 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 293 Diag(IILoc, diag::err_unknown_typename_suggest) 294 << &II << Corrected; 295 return true; 296 } 297 } 298 299 if (getLangOptions().CPlusPlus) { 300 // See if II is a class template that the user forgot to pass arguments to. 301 UnqualifiedId Name; 302 Name.setIdentifier(&II, IILoc); 303 CXXScopeSpec EmptySS; 304 TemplateTy TemplateResult; 305 bool MemberOfUnknownSpecialization; 306 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 307 Name, ParsedType(), true, TemplateResult, 308 MemberOfUnknownSpecialization) == TNK_Type_template) { 309 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 310 Diag(IILoc, diag::err_template_missing_args) << TplName; 311 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 312 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 313 << TplDecl->getTemplateParameters()->getSourceRange(); 314 } 315 return true; 316 } 317 } 318 319 // FIXME: Should we move the logic that tries to recover from a missing tag 320 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 321 322 if (!SS || (!SS->isSet() && !SS->isInvalid())) 323 Diag(IILoc, diag::err_unknown_typename) << &II; 324 else if (DeclContext *DC = computeDeclContext(*SS, false)) 325 Diag(IILoc, diag::err_typename_nested_not_found) 326 << &II << DC << SS->getRange(); 327 else if (isDependentScopeSpecifier(*SS)) { 328 Diag(SS->getRange().getBegin(), diag::err_typename_missing) 329 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 330 << SourceRange(SS->getRange().getBegin(), IILoc) 331 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 332 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 333 } else { 334 assert(SS && SS->isInvalid() && 335 "Invalid scope specifier has already been diagnosed"); 336 } 337 338 return true; 339} 340 341// Determines the context to return to after temporarily entering a 342// context. This depends in an unnecessarily complicated way on the 343// exact ordering of callbacks from the parser. 344DeclContext *Sema::getContainingDC(DeclContext *DC) { 345 346 // Functions defined inline within classes aren't parsed until we've 347 // finished parsing the top-level class, so the top-level class is 348 // the context we'll need to return to. 349 if (isa<FunctionDecl>(DC)) { 350 DC = DC->getLexicalParent(); 351 352 // A function not defined within a class will always return to its 353 // lexical context. 354 if (!isa<CXXRecordDecl>(DC)) 355 return DC; 356 357 // A C++ inline method/friend is parsed *after* the topmost class 358 // it was declared in is fully parsed ("complete"); the topmost 359 // class is the context we need to return to. 360 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 361 DC = RD; 362 363 // Return the declaration context of the topmost class the inline method is 364 // declared in. 365 return DC; 366 } 367 368 // ObjCMethodDecls are parsed (for some reason) outside the context 369 // of the class. 370 if (isa<ObjCMethodDecl>(DC)) 371 return DC->getLexicalParent()->getLexicalParent(); 372 373 return DC->getLexicalParent(); 374} 375 376void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 377 assert(getContainingDC(DC) == CurContext && 378 "The next DeclContext should be lexically contained in the current one."); 379 CurContext = DC; 380 S->setEntity(DC); 381} 382 383void Sema::PopDeclContext() { 384 assert(CurContext && "DeclContext imbalance!"); 385 386 CurContext = getContainingDC(CurContext); 387 assert(CurContext && "Popped translation unit!"); 388} 389 390/// EnterDeclaratorContext - Used when we must lookup names in the context 391/// of a declarator's nested name specifier. 392/// 393void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 394 // C++0x [basic.lookup.unqual]p13: 395 // A name used in the definition of a static data member of class 396 // X (after the qualified-id of the static member) is looked up as 397 // if the name was used in a member function of X. 398 // C++0x [basic.lookup.unqual]p14: 399 // If a variable member of a namespace is defined outside of the 400 // scope of its namespace then any name used in the definition of 401 // the variable member (after the declarator-id) is looked up as 402 // if the definition of the variable member occurred in its 403 // namespace. 404 // Both of these imply that we should push a scope whose context 405 // is the semantic context of the declaration. We can't use 406 // PushDeclContext here because that context is not necessarily 407 // lexically contained in the current context. Fortunately, 408 // the containing scope should have the appropriate information. 409 410 assert(!S->getEntity() && "scope already has entity"); 411 412#ifndef NDEBUG 413 Scope *Ancestor = S->getParent(); 414 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 415 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 416#endif 417 418 CurContext = DC; 419 S->setEntity(DC); 420} 421 422void Sema::ExitDeclaratorContext(Scope *S) { 423 assert(S->getEntity() == CurContext && "Context imbalance!"); 424 425 // Switch back to the lexical context. The safety of this is 426 // enforced by an assert in EnterDeclaratorContext. 427 Scope *Ancestor = S->getParent(); 428 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 429 CurContext = (DeclContext*) Ancestor->getEntity(); 430 431 // We don't need to do anything with the scope, which is going to 432 // disappear. 433} 434 435/// \brief Determine whether we allow overloading of the function 436/// PrevDecl with another declaration. 437/// 438/// This routine determines whether overloading is possible, not 439/// whether some new function is actually an overload. It will return 440/// true in C++ (where we can always provide overloads) or, as an 441/// extension, in C when the previous function is already an 442/// overloaded function declaration or has the "overloadable" 443/// attribute. 444static bool AllowOverloadingOfFunction(LookupResult &Previous, 445 ASTContext &Context) { 446 if (Context.getLangOptions().CPlusPlus) 447 return true; 448 449 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 450 return true; 451 452 return (Previous.getResultKind() == LookupResult::Found 453 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 454} 455 456/// Add this decl to the scope shadowed decl chains. 457void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 458 // Move up the scope chain until we find the nearest enclosing 459 // non-transparent context. The declaration will be introduced into this 460 // scope. 461 while (S->getEntity() && 462 ((DeclContext *)S->getEntity())->isTransparentContext()) 463 S = S->getParent(); 464 465 // Add scoped declarations into their context, so that they can be 466 // found later. Declarations without a context won't be inserted 467 // into any context. 468 if (AddToContext) 469 CurContext->addDecl(D); 470 471 // Out-of-line definitions shouldn't be pushed into scope in C++. 472 // Out-of-line variable and function definitions shouldn't even in C. 473 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 474 D->isOutOfLine()) 475 return; 476 477 // Template instantiations should also not be pushed into scope. 478 if (isa<FunctionDecl>(D) && 479 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 480 return; 481 482 // If this replaces anything in the current scope, 483 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 484 IEnd = IdResolver.end(); 485 for (; I != IEnd; ++I) { 486 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 487 S->RemoveDecl(*I); 488 IdResolver.RemoveDecl(*I); 489 490 // Should only need to replace one decl. 491 break; 492 } 493 } 494 495 S->AddDecl(D); 496 IdResolver.AddDecl(D); 497} 498 499bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 500 bool ExplicitInstantiationOrSpecialization) { 501 return IdResolver.isDeclInScope(D, Ctx, Context, S, 502 ExplicitInstantiationOrSpecialization); 503} 504 505Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 506 DeclContext *TargetDC = DC->getPrimaryContext(); 507 do { 508 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 509 if (ScopeDC->getPrimaryContext() == TargetDC) 510 return S; 511 } while ((S = S->getParent())); 512 513 return 0; 514} 515 516static bool isOutOfScopePreviousDeclaration(NamedDecl *, 517 DeclContext*, 518 ASTContext&); 519 520/// Filters out lookup results that don't fall within the given scope 521/// as determined by isDeclInScope. 522static void FilterLookupForScope(Sema &SemaRef, LookupResult &R, 523 DeclContext *Ctx, Scope *S, 524 bool ConsiderLinkage, 525 bool ExplicitInstantiationOrSpecialization) { 526 LookupResult::Filter F = R.makeFilter(); 527 while (F.hasNext()) { 528 NamedDecl *D = F.next(); 529 530 if (SemaRef.isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 531 continue; 532 533 if (ConsiderLinkage && 534 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context)) 535 continue; 536 537 F.erase(); 538 } 539 540 F.done(); 541} 542 543static bool isUsingDecl(NamedDecl *D) { 544 return isa<UsingShadowDecl>(D) || 545 isa<UnresolvedUsingTypenameDecl>(D) || 546 isa<UnresolvedUsingValueDecl>(D); 547} 548 549/// Removes using shadow declarations from the lookup results. 550static void RemoveUsingDecls(LookupResult &R) { 551 LookupResult::Filter F = R.makeFilter(); 552 while (F.hasNext()) 553 if (isUsingDecl(F.next())) 554 F.erase(); 555 556 F.done(); 557} 558 559/// \brief Check for this common pattern: 560/// @code 561/// class S { 562/// S(const S&); // DO NOT IMPLEMENT 563/// void operator=(const S&); // DO NOT IMPLEMENT 564/// }; 565/// @endcode 566static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 567 // FIXME: Should check for private access too but access is set after we get 568 // the decl here. 569 if (D->isThisDeclarationADefinition()) 570 return false; 571 572 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 573 return CD->isCopyConstructor(); 574 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 575 return Method->isCopyAssignmentOperator(); 576 return false; 577} 578 579bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 580 assert(D); 581 582 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 583 return false; 584 585 // Ignore class templates. 586 if (D->getDeclContext()->isDependentContext() || 587 D->getLexicalDeclContext()->isDependentContext()) 588 return false; 589 590 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 591 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 592 return false; 593 594 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 595 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 596 return false; 597 } else { 598 // 'static inline' functions are used in headers; don't warn. 599 if (FD->getStorageClass() == SC_Static && 600 FD->isInlineSpecified()) 601 return false; 602 } 603 604 if (FD->isThisDeclarationADefinition() && 605 Context.DeclMustBeEmitted(FD)) 606 return false; 607 608 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 609 if (!VD->isFileVarDecl() || 610 VD->getType().isConstant(Context) || 611 Context.DeclMustBeEmitted(VD)) 612 return false; 613 614 if (VD->isStaticDataMember() && 615 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 616 return false; 617 618 } else { 619 return false; 620 } 621 622 // Only warn for unused decls internal to the translation unit. 623 if (D->getLinkage() == ExternalLinkage) 624 return false; 625 626 return true; 627} 628 629void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 630 if (!D) 631 return; 632 633 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 634 const FunctionDecl *First = FD->getFirstDeclaration(); 635 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 636 return; // First should already be in the vector. 637 } 638 639 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 640 const VarDecl *First = VD->getFirstDeclaration(); 641 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 642 return; // First should already be in the vector. 643 } 644 645 if (ShouldWarnIfUnusedFileScopedDecl(D)) 646 UnusedFileScopedDecls.push_back(D); 647 } 648 649static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 650 if (D->isInvalidDecl()) 651 return false; 652 653 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 654 return false; 655 656 if (isa<LabelDecl>(D)) 657 return true; 658 659 // White-list anything that isn't a local variable. 660 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 661 !D->getDeclContext()->isFunctionOrMethod()) 662 return false; 663 664 // Types of valid local variables should be complete, so this should succeed. 665 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 666 667 // White-list anything with an __attribute__((unused)) type. 668 QualType Ty = VD->getType(); 669 670 // Only look at the outermost level of typedef. 671 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 672 if (TT->getDecl()->hasAttr<UnusedAttr>()) 673 return false; 674 } 675 676 // If we failed to complete the type for some reason, or if the type is 677 // dependent, don't diagnose the variable. 678 if (Ty->isIncompleteType() || Ty->isDependentType()) 679 return false; 680 681 if (const TagType *TT = Ty->getAs<TagType>()) { 682 const TagDecl *Tag = TT->getDecl(); 683 if (Tag->hasAttr<UnusedAttr>()) 684 return false; 685 686 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 687 // FIXME: Checking for the presence of a user-declared constructor 688 // isn't completely accurate; we'd prefer to check that the initializer 689 // has no side effects. 690 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 691 return false; 692 } 693 } 694 695 // TODO: __attribute__((unused)) templates? 696 } 697 698 return true; 699} 700 701/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 702/// unless they are marked attr(unused). 703void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 704 if (!ShouldDiagnoseUnusedDecl(D)) 705 return; 706 707 unsigned DiagID; 708 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 709 DiagID = diag::warn_unused_exception_param; 710 else if (isa<LabelDecl>(D)) 711 DiagID = diag::warn_unused_label; 712 else 713 DiagID = diag::warn_unused_variable; 714 715 Diag(D->getLocation(), DiagID) << D->getDeclName(); 716} 717 718static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 719 // Verify that we have no forward references left. If so, there was a goto 720 // or address of a label taken, but no definition of it. Label fwd 721 // definitions are indicated with a null substmt. 722 if (L->getStmt() == 0) 723 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 724} 725 726void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 727 if (S->decl_empty()) return; 728 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 729 "Scope shouldn't contain decls!"); 730 731 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 732 I != E; ++I) { 733 Decl *TmpD = (*I); 734 assert(TmpD && "This decl didn't get pushed??"); 735 736 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 737 NamedDecl *D = cast<NamedDecl>(TmpD); 738 739 if (!D->getDeclName()) continue; 740 741 // Diagnose unused variables in this scope. 742 if (!S->hasErrorOccurred()) 743 DiagnoseUnusedDecl(D); 744 745 // If this was a forward reference to a label, verify it was defined. 746 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 747 CheckPoppedLabel(LD, *this); 748 749 // Remove this name from our lexical scope. 750 IdResolver.RemoveDecl(D); 751 } 752} 753 754/// \brief Look for an Objective-C class in the translation unit. 755/// 756/// \param Id The name of the Objective-C class we're looking for. If 757/// typo-correction fixes this name, the Id will be updated 758/// to the fixed name. 759/// 760/// \param IdLoc The location of the name in the translation unit. 761/// 762/// \param TypoCorrection If true, this routine will attempt typo correction 763/// if there is no class with the given name. 764/// 765/// \returns The declaration of the named Objective-C class, or NULL if the 766/// class could not be found. 767ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 768 SourceLocation IdLoc, 769 bool TypoCorrection) { 770 // The third "scope" argument is 0 since we aren't enabling lazy built-in 771 // creation from this context. 772 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 773 774 if (!IDecl && TypoCorrection) { 775 // Perform typo correction at the given location, but only if we 776 // find an Objective-C class name. 777 LookupResult R(*this, Id, IdLoc, LookupOrdinaryName); 778 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 779 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 780 Diag(IdLoc, diag::err_undef_interface_suggest) 781 << Id << IDecl->getDeclName() 782 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 783 Diag(IDecl->getLocation(), diag::note_previous_decl) 784 << IDecl->getDeclName(); 785 786 Id = IDecl->getIdentifier(); 787 } 788 } 789 790 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 791} 792 793/// getNonFieldDeclScope - Retrieves the innermost scope, starting 794/// from S, where a non-field would be declared. This routine copes 795/// with the difference between C and C++ scoping rules in structs and 796/// unions. For example, the following code is well-formed in C but 797/// ill-formed in C++: 798/// @code 799/// struct S6 { 800/// enum { BAR } e; 801/// }; 802/// 803/// void test_S6() { 804/// struct S6 a; 805/// a.e = BAR; 806/// } 807/// @endcode 808/// For the declaration of BAR, this routine will return a different 809/// scope. The scope S will be the scope of the unnamed enumeration 810/// within S6. In C++, this routine will return the scope associated 811/// with S6, because the enumeration's scope is a transparent 812/// context but structures can contain non-field names. In C, this 813/// routine will return the translation unit scope, since the 814/// enumeration's scope is a transparent context and structures cannot 815/// contain non-field names. 816Scope *Sema::getNonFieldDeclScope(Scope *S) { 817 while (((S->getFlags() & Scope::DeclScope) == 0) || 818 (S->getEntity() && 819 ((DeclContext *)S->getEntity())->isTransparentContext()) || 820 (S->isClassScope() && !getLangOptions().CPlusPlus)) 821 S = S->getParent(); 822 return S; 823} 824 825/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 826/// file scope. lazily create a decl for it. ForRedeclaration is true 827/// if we're creating this built-in in anticipation of redeclaring the 828/// built-in. 829NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 830 Scope *S, bool ForRedeclaration, 831 SourceLocation Loc) { 832 Builtin::ID BID = (Builtin::ID)bid; 833 834 ASTContext::GetBuiltinTypeError Error; 835 QualType R = Context.GetBuiltinType(BID, Error); 836 switch (Error) { 837 case ASTContext::GE_None: 838 // Okay 839 break; 840 841 case ASTContext::GE_Missing_stdio: 842 if (ForRedeclaration) 843 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 844 << Context.BuiltinInfo.GetName(BID); 845 return 0; 846 847 case ASTContext::GE_Missing_setjmp: 848 if (ForRedeclaration) 849 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 850 << Context.BuiltinInfo.GetName(BID); 851 return 0; 852 } 853 854 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 855 Diag(Loc, diag::ext_implicit_lib_function_decl) 856 << Context.BuiltinInfo.GetName(BID) 857 << R; 858 if (Context.BuiltinInfo.getHeaderName(BID) && 859 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 860 != Diagnostic::Ignored) 861 Diag(Loc, diag::note_please_include_header) 862 << Context.BuiltinInfo.getHeaderName(BID) 863 << Context.BuiltinInfo.GetName(BID); 864 } 865 866 FunctionDecl *New = FunctionDecl::Create(Context, 867 Context.getTranslationUnitDecl(), 868 Loc, II, R, /*TInfo=*/0, 869 SC_Extern, 870 SC_None, false, 871 /*hasPrototype=*/true); 872 New->setImplicit(); 873 874 // Create Decl objects for each parameter, adding them to the 875 // FunctionDecl. 876 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 877 llvm::SmallVector<ParmVarDecl*, 16> Params; 878 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 879 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 880 FT->getArgType(i), /*TInfo=*/0, 881 SC_None, SC_None, 0)); 882 New->setParams(Params.data(), Params.size()); 883 } 884 885 AddKnownFunctionAttributes(New); 886 887 // TUScope is the translation-unit scope to insert this function into. 888 // FIXME: This is hideous. We need to teach PushOnScopeChains to 889 // relate Scopes to DeclContexts, and probably eliminate CurContext 890 // entirely, but we're not there yet. 891 DeclContext *SavedContext = CurContext; 892 CurContext = Context.getTranslationUnitDecl(); 893 PushOnScopeChains(New, TUScope); 894 CurContext = SavedContext; 895 return New; 896} 897 898/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 899/// same name and scope as a previous declaration 'Old'. Figure out 900/// how to resolve this situation, merging decls or emitting 901/// diagnostics as appropriate. If there was an error, set New to be invalid. 902/// 903void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 904 // If the new decl is known invalid already, don't bother doing any 905 // merging checks. 906 if (New->isInvalidDecl()) return; 907 908 // Allow multiple definitions for ObjC built-in typedefs. 909 // FIXME: Verify the underlying types are equivalent! 910 if (getLangOptions().ObjC1) { 911 const IdentifierInfo *TypeID = New->getIdentifier(); 912 switch (TypeID->getLength()) { 913 default: break; 914 case 2: 915 if (!TypeID->isStr("id")) 916 break; 917 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 918 // Install the built-in type for 'id', ignoring the current definition. 919 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 920 return; 921 case 5: 922 if (!TypeID->isStr("Class")) 923 break; 924 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 925 // Install the built-in type for 'Class', ignoring the current definition. 926 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 927 return; 928 case 3: 929 if (!TypeID->isStr("SEL")) 930 break; 931 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 932 // Install the built-in type for 'SEL', ignoring the current definition. 933 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 934 return; 935 case 8: 936 if (!TypeID->isStr("Protocol")) 937 break; 938 Context.setObjCProtoType(New->getUnderlyingType()); 939 return; 940 } 941 // Fall through - the typedef name was not a builtin type. 942 } 943 944 // Verify the old decl was also a type. 945 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 946 if (!Old) { 947 Diag(New->getLocation(), diag::err_redefinition_different_kind) 948 << New->getDeclName(); 949 950 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 951 if (OldD->getLocation().isValid()) 952 Diag(OldD->getLocation(), diag::note_previous_definition); 953 954 return New->setInvalidDecl(); 955 } 956 957 // If the old declaration is invalid, just give up here. 958 if (Old->isInvalidDecl()) 959 return New->setInvalidDecl(); 960 961 // Determine the "old" type we'll use for checking and diagnostics. 962 QualType OldType; 963 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 964 OldType = OldTypedef->getUnderlyingType(); 965 else 966 OldType = Context.getTypeDeclType(Old); 967 968 // If the typedef types are not identical, reject them in all languages and 969 // with any extensions enabled. 970 971 if (OldType != New->getUnderlyingType() && 972 Context.getCanonicalType(OldType) != 973 Context.getCanonicalType(New->getUnderlyingType())) { 974 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 975 << New->getUnderlyingType() << OldType; 976 if (Old->getLocation().isValid()) 977 Diag(Old->getLocation(), diag::note_previous_definition); 978 return New->setInvalidDecl(); 979 } 980 981 // The types match. Link up the redeclaration chain if the old 982 // declaration was a typedef. 983 // FIXME: this is a potential source of wierdness if the type 984 // spellings don't match exactly. 985 if (isa<TypedefDecl>(Old)) 986 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 987 988 if (getLangOptions().Microsoft) 989 return; 990 991 if (getLangOptions().CPlusPlus) { 992 // C++ [dcl.typedef]p2: 993 // In a given non-class scope, a typedef specifier can be used to 994 // redefine the name of any type declared in that scope to refer 995 // to the type to which it already refers. 996 if (!isa<CXXRecordDecl>(CurContext)) 997 return; 998 999 // C++0x [dcl.typedef]p4: 1000 // In a given class scope, a typedef specifier can be used to redefine 1001 // any class-name declared in that scope that is not also a typedef-name 1002 // to refer to the type to which it already refers. 1003 // 1004 // This wording came in via DR424, which was a correction to the 1005 // wording in DR56, which accidentally banned code like: 1006 // 1007 // struct S { 1008 // typedef struct A { } A; 1009 // }; 1010 // 1011 // in the C++03 standard. We implement the C++0x semantics, which 1012 // allow the above but disallow 1013 // 1014 // struct S { 1015 // typedef int I; 1016 // typedef int I; 1017 // }; 1018 // 1019 // since that was the intent of DR56. 1020 if (!isa<TypedefDecl >(Old)) 1021 return; 1022 1023 Diag(New->getLocation(), diag::err_redefinition) 1024 << New->getDeclName(); 1025 Diag(Old->getLocation(), diag::note_previous_definition); 1026 return New->setInvalidDecl(); 1027 } 1028 1029 // If we have a redefinition of a typedef in C, emit a warning. This warning 1030 // is normally mapped to an error, but can be controlled with 1031 // -Wtypedef-redefinition. If either the original or the redefinition is 1032 // in a system header, don't emit this for compatibility with GCC. 1033 if (getDiagnostics().getSuppressSystemWarnings() && 1034 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1035 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1036 return; 1037 1038 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1039 << New->getDeclName(); 1040 Diag(Old->getLocation(), diag::note_previous_definition); 1041 return; 1042} 1043 1044/// DeclhasAttr - returns true if decl Declaration already has the target 1045/// attribute. 1046static bool 1047DeclHasAttr(const Decl *D, const Attr *A) { 1048 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1049 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1050 if ((*i)->getKind() == A->getKind()) { 1051 // FIXME: Don't hardcode this check 1052 if (OA && isa<OwnershipAttr>(*i)) 1053 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1054 return true; 1055 } 1056 1057 return false; 1058} 1059 1060/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1061static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1062 ASTContext &C) { 1063 if (!oldDecl->hasAttrs()) 1064 return; 1065 1066 bool foundAny = newDecl->hasAttrs(); 1067 1068 // Ensure that any moving of objects within the allocated map is done before 1069 // we process them. 1070 if (!foundAny) newDecl->setAttrs(AttrVec()); 1071 1072 for (specific_attr_iterator<InheritableAttr> 1073 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1074 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1075 if (!DeclHasAttr(newDecl, *i)) { 1076 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1077 newAttr->setInherited(true); 1078 newDecl->addAttr(newAttr); 1079 foundAny = true; 1080 } 1081 } 1082 1083 if (!foundAny) newDecl->dropAttrs(); 1084} 1085 1086/// mergeParamDeclAttributes - Copy attributes from the old parameter 1087/// to the new one. 1088static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1089 const ParmVarDecl *oldDecl, 1090 ASTContext &C) { 1091 if (!oldDecl->hasAttrs()) 1092 return; 1093 1094 bool foundAny = newDecl->hasAttrs(); 1095 1096 // Ensure that any moving of objects within the allocated map is 1097 // done before we process them. 1098 if (!foundAny) newDecl->setAttrs(AttrVec()); 1099 1100 for (specific_attr_iterator<InheritableParamAttr> 1101 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1102 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1103 if (!DeclHasAttr(newDecl, *i)) { 1104 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1105 newAttr->setInherited(true); 1106 newDecl->addAttr(newAttr); 1107 foundAny = true; 1108 } 1109 } 1110 1111 if (!foundAny) newDecl->dropAttrs(); 1112} 1113 1114namespace { 1115 1116/// Used in MergeFunctionDecl to keep track of function parameters in 1117/// C. 1118struct GNUCompatibleParamWarning { 1119 ParmVarDecl *OldParm; 1120 ParmVarDecl *NewParm; 1121 QualType PromotedType; 1122}; 1123 1124} 1125 1126/// getSpecialMember - get the special member enum for a method. 1127Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1128 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1129 if (Ctor->isCopyConstructor()) 1130 return Sema::CXXCopyConstructor; 1131 1132 return Sema::CXXConstructor; 1133 } 1134 1135 if (isa<CXXDestructorDecl>(MD)) 1136 return Sema::CXXDestructor; 1137 1138 assert(MD->isCopyAssignmentOperator() && 1139 "Must have copy assignment operator"); 1140 return Sema::CXXCopyAssignment; 1141} 1142 1143/// canRedefineFunction - checks if a function can be redefined. Currently, 1144/// only extern inline functions can be redefined, and even then only in 1145/// GNU89 mode. 1146static bool canRedefineFunction(const FunctionDecl *FD, 1147 const LangOptions& LangOpts) { 1148 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 1149 FD->isInlineSpecified() && 1150 FD->getStorageClass() == SC_Extern); 1151} 1152 1153/// MergeFunctionDecl - We just parsed a function 'New' from 1154/// declarator D which has the same name and scope as a previous 1155/// declaration 'Old'. Figure out how to resolve this situation, 1156/// merging decls or emitting diagnostics as appropriate. 1157/// 1158/// In C++, New and Old must be declarations that are not 1159/// overloaded. Use IsOverload to determine whether New and Old are 1160/// overloaded, and to select the Old declaration that New should be 1161/// merged with. 1162/// 1163/// Returns true if there was an error, false otherwise. 1164bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1165 // Verify the old decl was also a function. 1166 FunctionDecl *Old = 0; 1167 if (FunctionTemplateDecl *OldFunctionTemplate 1168 = dyn_cast<FunctionTemplateDecl>(OldD)) 1169 Old = OldFunctionTemplate->getTemplatedDecl(); 1170 else 1171 Old = dyn_cast<FunctionDecl>(OldD); 1172 if (!Old) { 1173 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1174 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1175 Diag(Shadow->getTargetDecl()->getLocation(), 1176 diag::note_using_decl_target); 1177 Diag(Shadow->getUsingDecl()->getLocation(), 1178 diag::note_using_decl) << 0; 1179 return true; 1180 } 1181 1182 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1183 << New->getDeclName(); 1184 Diag(OldD->getLocation(), diag::note_previous_definition); 1185 return true; 1186 } 1187 1188 // Determine whether the previous declaration was a definition, 1189 // implicit declaration, or a declaration. 1190 diag::kind PrevDiag; 1191 if (Old->isThisDeclarationADefinition()) 1192 PrevDiag = diag::note_previous_definition; 1193 else if (Old->isImplicit()) 1194 PrevDiag = diag::note_previous_implicit_declaration; 1195 else 1196 PrevDiag = diag::note_previous_declaration; 1197 1198 QualType OldQType = Context.getCanonicalType(Old->getType()); 1199 QualType NewQType = Context.getCanonicalType(New->getType()); 1200 1201 // Don't complain about this if we're in GNU89 mode and the old function 1202 // is an extern inline function. 1203 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1204 New->getStorageClass() == SC_Static && 1205 Old->getStorageClass() != SC_Static && 1206 !canRedefineFunction(Old, getLangOptions())) { 1207 Diag(New->getLocation(), diag::err_static_non_static) 1208 << New; 1209 Diag(Old->getLocation(), PrevDiag); 1210 return true; 1211 } 1212 1213 // If a function is first declared with a calling convention, but is 1214 // later declared or defined without one, the second decl assumes the 1215 // calling convention of the first. 1216 // 1217 // For the new decl, we have to look at the NON-canonical type to tell the 1218 // difference between a function that really doesn't have a calling 1219 // convention and one that is declared cdecl. That's because in 1220 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1221 // because it is the default calling convention. 1222 // 1223 // Note also that we DO NOT return at this point, because we still have 1224 // other tests to run. 1225 const FunctionType *OldType = cast<FunctionType>(OldQType); 1226 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1227 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1228 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1229 bool RequiresAdjustment = false; 1230 if (OldTypeInfo.getCC() != CC_Default && 1231 NewTypeInfo.getCC() == CC_Default) { 1232 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1233 RequiresAdjustment = true; 1234 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1235 NewTypeInfo.getCC())) { 1236 // Calling conventions really aren't compatible, so complain. 1237 Diag(New->getLocation(), diag::err_cconv_change) 1238 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1239 << (OldTypeInfo.getCC() == CC_Default) 1240 << (OldTypeInfo.getCC() == CC_Default ? "" : 1241 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1242 Diag(Old->getLocation(), diag::note_previous_declaration); 1243 return true; 1244 } 1245 1246 // FIXME: diagnose the other way around? 1247 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1248 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1249 RequiresAdjustment = true; 1250 } 1251 1252 // Merge regparm attribute. 1253 if (OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1254 if (NewTypeInfo.getRegParm()) { 1255 Diag(New->getLocation(), diag::err_regparm_mismatch) 1256 << NewType->getRegParmType() 1257 << OldType->getRegParmType(); 1258 Diag(Old->getLocation(), diag::note_previous_declaration); 1259 return true; 1260 } 1261 1262 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1263 RequiresAdjustment = true; 1264 } 1265 1266 if (RequiresAdjustment) { 1267 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1268 New->setType(QualType(NewType, 0)); 1269 NewQType = Context.getCanonicalType(New->getType()); 1270 } 1271 1272 if (getLangOptions().CPlusPlus) { 1273 // (C++98 13.1p2): 1274 // Certain function declarations cannot be overloaded: 1275 // -- Function declarations that differ only in the return type 1276 // cannot be overloaded. 1277 QualType OldReturnType = OldType->getResultType(); 1278 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1279 QualType ResQT; 1280 if (OldReturnType != NewReturnType) { 1281 if (NewReturnType->isObjCObjectPointerType() 1282 && OldReturnType->isObjCObjectPointerType()) 1283 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1284 if (ResQT.isNull()) { 1285 if (New->isCXXClassMember() && New->isOutOfLine()) 1286 Diag(New->getLocation(), 1287 diag::err_member_def_does_not_match_ret_type) << New; 1288 else 1289 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1290 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1291 return true; 1292 } 1293 else 1294 NewQType = ResQT; 1295 } 1296 1297 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1298 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1299 if (OldMethod && NewMethod) { 1300 // Preserve triviality. 1301 NewMethod->setTrivial(OldMethod->isTrivial()); 1302 1303 bool isFriend = NewMethod->getFriendObjectKind(); 1304 1305 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) { 1306 // -- Member function declarations with the same name and the 1307 // same parameter types cannot be overloaded if any of them 1308 // is a static member function declaration. 1309 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1310 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1311 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1312 return true; 1313 } 1314 1315 // C++ [class.mem]p1: 1316 // [...] A member shall not be declared twice in the 1317 // member-specification, except that a nested class or member 1318 // class template can be declared and then later defined. 1319 unsigned NewDiag; 1320 if (isa<CXXConstructorDecl>(OldMethod)) 1321 NewDiag = diag::err_constructor_redeclared; 1322 else if (isa<CXXDestructorDecl>(NewMethod)) 1323 NewDiag = diag::err_destructor_redeclared; 1324 else if (isa<CXXConversionDecl>(NewMethod)) 1325 NewDiag = diag::err_conv_function_redeclared; 1326 else 1327 NewDiag = diag::err_member_redeclared; 1328 1329 Diag(New->getLocation(), NewDiag); 1330 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1331 1332 // Complain if this is an explicit declaration of a special 1333 // member that was initially declared implicitly. 1334 // 1335 // As an exception, it's okay to befriend such methods in order 1336 // to permit the implicit constructor/destructor/operator calls. 1337 } else if (OldMethod->isImplicit()) { 1338 if (isFriend) { 1339 NewMethod->setImplicit(); 1340 } else { 1341 Diag(NewMethod->getLocation(), 1342 diag::err_definition_of_implicitly_declared_member) 1343 << New << getSpecialMember(OldMethod); 1344 return true; 1345 } 1346 } 1347 } 1348 1349 // (C++98 8.3.5p3): 1350 // All declarations for a function shall agree exactly in both the 1351 // return type and the parameter-type-list. 1352 // We also want to respect all the extended bits except noreturn. 1353 1354 // noreturn should now match unless the old type info didn't have it. 1355 QualType OldQTypeForComparison = OldQType; 1356 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1357 assert(OldQType == QualType(OldType, 0)); 1358 const FunctionType *OldTypeForComparison 1359 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1360 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1361 assert(OldQTypeForComparison.isCanonical()); 1362 } 1363 1364 if (OldQTypeForComparison == NewQType) 1365 return MergeCompatibleFunctionDecls(New, Old); 1366 1367 // Fall through for conflicting redeclarations and redefinitions. 1368 } 1369 1370 // C: Function types need to be compatible, not identical. This handles 1371 // duplicate function decls like "void f(int); void f(enum X);" properly. 1372 if (!getLangOptions().CPlusPlus && 1373 Context.typesAreCompatible(OldQType, NewQType)) { 1374 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1375 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1376 const FunctionProtoType *OldProto = 0; 1377 if (isa<FunctionNoProtoType>(NewFuncType) && 1378 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1379 // The old declaration provided a function prototype, but the 1380 // new declaration does not. Merge in the prototype. 1381 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1382 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1383 OldProto->arg_type_end()); 1384 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1385 ParamTypes.data(), ParamTypes.size(), 1386 OldProto->getExtProtoInfo()); 1387 New->setType(NewQType); 1388 New->setHasInheritedPrototype(); 1389 1390 // Synthesize a parameter for each argument type. 1391 llvm::SmallVector<ParmVarDecl*, 16> Params; 1392 for (FunctionProtoType::arg_type_iterator 1393 ParamType = OldProto->arg_type_begin(), 1394 ParamEnd = OldProto->arg_type_end(); 1395 ParamType != ParamEnd; ++ParamType) { 1396 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1397 SourceLocation(), 0, 1398 *ParamType, /*TInfo=*/0, 1399 SC_None, SC_None, 1400 0); 1401 Param->setImplicit(); 1402 Params.push_back(Param); 1403 } 1404 1405 New->setParams(Params.data(), Params.size()); 1406 } 1407 1408 return MergeCompatibleFunctionDecls(New, Old); 1409 } 1410 1411 // GNU C permits a K&R definition to follow a prototype declaration 1412 // if the declared types of the parameters in the K&R definition 1413 // match the types in the prototype declaration, even when the 1414 // promoted types of the parameters from the K&R definition differ 1415 // from the types in the prototype. GCC then keeps the types from 1416 // the prototype. 1417 // 1418 // If a variadic prototype is followed by a non-variadic K&R definition, 1419 // the K&R definition becomes variadic. This is sort of an edge case, but 1420 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1421 // C99 6.9.1p8. 1422 if (!getLangOptions().CPlusPlus && 1423 Old->hasPrototype() && !New->hasPrototype() && 1424 New->getType()->getAs<FunctionProtoType>() && 1425 Old->getNumParams() == New->getNumParams()) { 1426 llvm::SmallVector<QualType, 16> ArgTypes; 1427 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1428 const FunctionProtoType *OldProto 1429 = Old->getType()->getAs<FunctionProtoType>(); 1430 const FunctionProtoType *NewProto 1431 = New->getType()->getAs<FunctionProtoType>(); 1432 1433 // Determine whether this is the GNU C extension. 1434 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1435 NewProto->getResultType()); 1436 bool LooseCompatible = !MergedReturn.isNull(); 1437 for (unsigned Idx = 0, End = Old->getNumParams(); 1438 LooseCompatible && Idx != End; ++Idx) { 1439 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1440 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1441 if (Context.typesAreCompatible(OldParm->getType(), 1442 NewProto->getArgType(Idx))) { 1443 ArgTypes.push_back(NewParm->getType()); 1444 } else if (Context.typesAreCompatible(OldParm->getType(), 1445 NewParm->getType(), 1446 /*CompareUnqualified=*/true)) { 1447 GNUCompatibleParamWarning Warn 1448 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1449 Warnings.push_back(Warn); 1450 ArgTypes.push_back(NewParm->getType()); 1451 } else 1452 LooseCompatible = false; 1453 } 1454 1455 if (LooseCompatible) { 1456 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1457 Diag(Warnings[Warn].NewParm->getLocation(), 1458 diag::ext_param_promoted_not_compatible_with_prototype) 1459 << Warnings[Warn].PromotedType 1460 << Warnings[Warn].OldParm->getType(); 1461 if (Warnings[Warn].OldParm->getLocation().isValid()) 1462 Diag(Warnings[Warn].OldParm->getLocation(), 1463 diag::note_previous_declaration); 1464 } 1465 1466 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1467 ArgTypes.size(), 1468 OldProto->getExtProtoInfo())); 1469 return MergeCompatibleFunctionDecls(New, Old); 1470 } 1471 1472 // Fall through to diagnose conflicting types. 1473 } 1474 1475 // A function that has already been declared has been redeclared or defined 1476 // with a different type- show appropriate diagnostic 1477 if (unsigned BuiltinID = Old->getBuiltinID()) { 1478 // The user has declared a builtin function with an incompatible 1479 // signature. 1480 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1481 // The function the user is redeclaring is a library-defined 1482 // function like 'malloc' or 'printf'. Warn about the 1483 // redeclaration, then pretend that we don't know about this 1484 // library built-in. 1485 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1486 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1487 << Old << Old->getType(); 1488 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1489 Old->setInvalidDecl(); 1490 return false; 1491 } 1492 1493 PrevDiag = diag::note_previous_builtin_declaration; 1494 } 1495 1496 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1497 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1498 return true; 1499} 1500 1501/// \brief Completes the merge of two function declarations that are 1502/// known to be compatible. 1503/// 1504/// This routine handles the merging of attributes and other 1505/// properties of function declarations form the old declaration to 1506/// the new declaration, once we know that New is in fact a 1507/// redeclaration of Old. 1508/// 1509/// \returns false 1510bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1511 // Merge the attributes 1512 mergeDeclAttributes(New, Old, Context); 1513 1514 // Merge the storage class. 1515 if (Old->getStorageClass() != SC_Extern && 1516 Old->getStorageClass() != SC_None) 1517 New->setStorageClass(Old->getStorageClass()); 1518 1519 // Merge "pure" flag. 1520 if (Old->isPure()) 1521 New->setPure(); 1522 1523 // Merge the "deleted" flag. 1524 if (Old->isDeleted()) 1525 New->setDeleted(); 1526 1527 // Merge attributes from the parameters. These can mismatch with K&R 1528 // declarations. 1529 if (New->getNumParams() == Old->getNumParams()) 1530 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 1531 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 1532 Context); 1533 1534 if (getLangOptions().CPlusPlus) 1535 return MergeCXXFunctionDecl(New, Old); 1536 1537 return false; 1538} 1539 1540void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 1541 const ObjCMethodDecl *oldMethod) { 1542 // Merge the attributes. 1543 mergeDeclAttributes(newMethod, oldMethod, Context); 1544 1545 // Merge attributes from the parameters. 1546 for (ObjCMethodDecl::param_iterator oi = oldMethod->param_begin(), 1547 ni = newMethod->param_begin(), ne = newMethod->param_end(); 1548 ni != ne; ++ni, ++oi) 1549 mergeParamDeclAttributes(*ni, *oi, Context); 1550} 1551 1552/// MergeVarDecl - We parsed a variable 'New' which has the same name and scope 1553/// as a previous declaration 'Old'. Figure out how to merge their types, 1554/// emitting diagnostics as appropriate. 1555/// 1556/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 1557/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 1558/// check them before the initializer is attached. 1559/// 1560void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 1561 if (New->isInvalidDecl() || Old->isInvalidDecl()) 1562 return; 1563 1564 QualType MergedT; 1565 if (getLangOptions().CPlusPlus) { 1566 AutoType *AT = New->getType()->getContainedAutoType(); 1567 if (AT && !AT->isDeduced()) { 1568 // We don't know what the new type is until the initializer is attached. 1569 return; 1570 } else if (Context.hasSameType(New->getType(), Old->getType())) 1571 return; 1572 // C++ [basic.link]p10: 1573 // [...] the types specified by all declarations referring to a given 1574 // object or function shall be identical, except that declarations for an 1575 // array object can specify array types that differ by the presence or 1576 // absence of a major array bound (8.3.4). 1577 else if (Old->getType()->isIncompleteArrayType() && 1578 New->getType()->isArrayType()) { 1579 CanQual<ArrayType> OldArray 1580 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1581 CanQual<ArrayType> NewArray 1582 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1583 if (OldArray->getElementType() == NewArray->getElementType()) 1584 MergedT = New->getType(); 1585 } else if (Old->getType()->isArrayType() && 1586 New->getType()->isIncompleteArrayType()) { 1587 CanQual<ArrayType> OldArray 1588 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1589 CanQual<ArrayType> NewArray 1590 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1591 if (OldArray->getElementType() == NewArray->getElementType()) 1592 MergedT = Old->getType(); 1593 } else if (New->getType()->isObjCObjectPointerType() 1594 && Old->getType()->isObjCObjectPointerType()) { 1595 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 1596 Old->getType()); 1597 } 1598 } else { 1599 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1600 } 1601 if (MergedT.isNull()) { 1602 Diag(New->getLocation(), diag::err_redefinition_different_type) 1603 << New->getDeclName(); 1604 Diag(Old->getLocation(), diag::note_previous_definition); 1605 return New->setInvalidDecl(); 1606 } 1607 New->setType(MergedT); 1608} 1609 1610/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1611/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1612/// situation, merging decls or emitting diagnostics as appropriate. 1613/// 1614/// Tentative definition rules (C99 6.9.2p2) are checked by 1615/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1616/// definitions here, since the initializer hasn't been attached. 1617/// 1618void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1619 // If the new decl is already invalid, don't do any other checking. 1620 if (New->isInvalidDecl()) 1621 return; 1622 1623 // Verify the old decl was also a variable. 1624 VarDecl *Old = 0; 1625 if (!Previous.isSingleResult() || 1626 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1627 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1628 << New->getDeclName(); 1629 Diag(Previous.getRepresentativeDecl()->getLocation(), 1630 diag::note_previous_definition); 1631 return New->setInvalidDecl(); 1632 } 1633 1634 // C++ [class.mem]p1: 1635 // A member shall not be declared twice in the member-specification [...] 1636 // 1637 // Here, we need only consider static data members. 1638 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 1639 Diag(New->getLocation(), diag::err_duplicate_member) 1640 << New->getIdentifier(); 1641 Diag(Old->getLocation(), diag::note_previous_declaration); 1642 New->setInvalidDecl(); 1643 } 1644 1645 mergeDeclAttributes(New, Old, Context); 1646 1647 // Merge the types. 1648 MergeVarDeclTypes(New, Old); 1649 if (New->isInvalidDecl()) 1650 return; 1651 1652 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1653 if (New->getStorageClass() == SC_Static && 1654 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 1655 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1656 Diag(Old->getLocation(), diag::note_previous_definition); 1657 return New->setInvalidDecl(); 1658 } 1659 // C99 6.2.2p4: 1660 // For an identifier declared with the storage-class specifier 1661 // extern in a scope in which a prior declaration of that 1662 // identifier is visible,23) if the prior declaration specifies 1663 // internal or external linkage, the linkage of the identifier at 1664 // the later declaration is the same as the linkage specified at 1665 // the prior declaration. If no prior declaration is visible, or 1666 // if the prior declaration specifies no linkage, then the 1667 // identifier has external linkage. 1668 if (New->hasExternalStorage() && Old->hasLinkage()) 1669 /* Okay */; 1670 else if (New->getStorageClass() != SC_Static && 1671 Old->getStorageClass() == SC_Static) { 1672 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1673 Diag(Old->getLocation(), diag::note_previous_definition); 1674 return New->setInvalidDecl(); 1675 } 1676 1677 // Check if extern is followed by non-extern and vice-versa. 1678 if (New->hasExternalStorage() && 1679 !Old->hasLinkage() && Old->isLocalVarDecl()) { 1680 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 1681 Diag(Old->getLocation(), diag::note_previous_definition); 1682 return New->setInvalidDecl(); 1683 } 1684 if (Old->hasExternalStorage() && 1685 !New->hasLinkage() && New->isLocalVarDecl()) { 1686 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 1687 Diag(Old->getLocation(), diag::note_previous_definition); 1688 return New->setInvalidDecl(); 1689 } 1690 1691 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1692 1693 // FIXME: The test for external storage here seems wrong? We still 1694 // need to check for mismatches. 1695 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1696 // Don't complain about out-of-line definitions of static members. 1697 !(Old->getLexicalDeclContext()->isRecord() && 1698 !New->getLexicalDeclContext()->isRecord())) { 1699 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1700 Diag(Old->getLocation(), diag::note_previous_definition); 1701 return New->setInvalidDecl(); 1702 } 1703 1704 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1705 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1706 Diag(Old->getLocation(), diag::note_previous_definition); 1707 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1708 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1709 Diag(Old->getLocation(), diag::note_previous_definition); 1710 } 1711 1712 // C++ doesn't have tentative definitions, so go right ahead and check here. 1713 const VarDecl *Def; 1714 if (getLangOptions().CPlusPlus && 1715 New->isThisDeclarationADefinition() == VarDecl::Definition && 1716 (Def = Old->getDefinition())) { 1717 Diag(New->getLocation(), diag::err_redefinition) 1718 << New->getDeclName(); 1719 Diag(Def->getLocation(), diag::note_previous_definition); 1720 New->setInvalidDecl(); 1721 return; 1722 } 1723 // c99 6.2.2 P4. 1724 // For an identifier declared with the storage-class specifier extern in a 1725 // scope in which a prior declaration of that identifier is visible, if 1726 // the prior declaration specifies internal or external linkage, the linkage 1727 // of the identifier at the later declaration is the same as the linkage 1728 // specified at the prior declaration. 1729 // FIXME. revisit this code. 1730 if (New->hasExternalStorage() && 1731 Old->getLinkage() == InternalLinkage && 1732 New->getDeclContext() == Old->getDeclContext()) 1733 New->setStorageClass(Old->getStorageClass()); 1734 1735 // Keep a chain of previous declarations. 1736 New->setPreviousDeclaration(Old); 1737 1738 // Inherit access appropriately. 1739 New->setAccess(Old->getAccess()); 1740} 1741 1742/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1743/// no declarator (e.g. "struct foo;") is parsed. 1744Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 1745 DeclSpec &DS) { 1746 // FIXME: Error on inline/virtual/explicit 1747 // FIXME: Warn on useless __thread 1748 // FIXME: Warn on useless const/volatile 1749 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1750 // FIXME: Warn on useless attributes 1751 Decl *TagD = 0; 1752 TagDecl *Tag = 0; 1753 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1754 DS.getTypeSpecType() == DeclSpec::TST_struct || 1755 DS.getTypeSpecType() == DeclSpec::TST_union || 1756 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1757 TagD = DS.getRepAsDecl(); 1758 1759 if (!TagD) // We probably had an error 1760 return 0; 1761 1762 // Note that the above type specs guarantee that the 1763 // type rep is a Decl, whereas in many of the others 1764 // it's a Type. 1765 Tag = dyn_cast<TagDecl>(TagD); 1766 } 1767 1768 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1769 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1770 // or incomplete types shall not be restrict-qualified." 1771 if (TypeQuals & DeclSpec::TQ_restrict) 1772 Diag(DS.getRestrictSpecLoc(), 1773 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1774 << DS.getSourceRange(); 1775 } 1776 1777 if (DS.isFriendSpecified()) { 1778 // If we're dealing with a decl but not a TagDecl, assume that 1779 // whatever routines created it handled the friendship aspect. 1780 if (TagD && !Tag) 1781 return 0; 1782 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1783 } 1784 1785 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1786 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 1787 1788 if (!Record->getDeclName() && Record->isDefinition() && 1789 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1790 if (getLangOptions().CPlusPlus || 1791 Record->getDeclContext()->isRecord()) 1792 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 1793 1794 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1795 << DS.getSourceRange(); 1796 } 1797 } 1798 1799 // Check for Microsoft C extension: anonymous struct. 1800 if (getLangOptions().Microsoft && !getLangOptions().CPlusPlus && 1801 CurContext->isRecord() && 1802 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 1803 // Handle 2 kinds of anonymous struct: 1804 // struct STRUCT; 1805 // and 1806 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 1807 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 1808 if ((Record && Record->getDeclName() && !Record->isDefinition()) || 1809 (DS.getTypeSpecType() == DeclSpec::TST_typename && 1810 DS.getRepAsType().get()->isStructureType())) { 1811 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 1812 << DS.getSourceRange(); 1813 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 1814 } 1815 } 1816 1817 if (getLangOptions().CPlusPlus && 1818 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 1819 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 1820 if (Enum->enumerator_begin() == Enum->enumerator_end() && 1821 !Enum->getIdentifier() && !Enum->isInvalidDecl()) 1822 Diag(Enum->getLocation(), diag::ext_no_declarators) 1823 << DS.getSourceRange(); 1824 1825 if (!DS.isMissingDeclaratorOk() && 1826 DS.getTypeSpecType() != DeclSpec::TST_error) { 1827 // Warn about typedefs of enums without names, since this is an 1828 // extension in both Microsoft and GNU. 1829 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1830 Tag && isa<EnumDecl>(Tag)) { 1831 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1832 << DS.getSourceRange(); 1833 return Tag; 1834 } 1835 1836 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1837 << DS.getSourceRange(); 1838 } 1839 1840 return TagD; 1841} 1842 1843/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 1844/// builds a statement for it and returns it so it is evaluated. 1845StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 1846 StmtResult R; 1847 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 1848 Expr *Exp = DS.getRepAsExpr(); 1849 QualType Ty = Exp->getType(); 1850 if (Ty->isPointerType()) { 1851 do 1852 Ty = Ty->getAs<PointerType>()->getPointeeType(); 1853 while (Ty->isPointerType()); 1854 } 1855 if (Ty->isVariableArrayType()) { 1856 R = ActOnExprStmt(MakeFullExpr(Exp)); 1857 } 1858 } 1859 return R; 1860} 1861 1862/// We are trying to inject an anonymous member into the given scope; 1863/// check if there's an existing declaration that can't be overloaded. 1864/// 1865/// \return true if this is a forbidden redeclaration 1866static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1867 Scope *S, 1868 DeclContext *Owner, 1869 DeclarationName Name, 1870 SourceLocation NameLoc, 1871 unsigned diagnostic) { 1872 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1873 Sema::ForRedeclaration); 1874 if (!SemaRef.LookupName(R, S)) return false; 1875 1876 if (R.getAsSingle<TagDecl>()) 1877 return false; 1878 1879 // Pick a representative declaration. 1880 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1881 assert(PrevDecl && "Expected a non-null Decl"); 1882 1883 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 1884 return false; 1885 1886 SemaRef.Diag(NameLoc, diagnostic) << Name; 1887 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1888 1889 return true; 1890} 1891 1892/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1893/// anonymous struct or union AnonRecord into the owning context Owner 1894/// and scope S. This routine will be invoked just after we realize 1895/// that an unnamed union or struct is actually an anonymous union or 1896/// struct, e.g., 1897/// 1898/// @code 1899/// union { 1900/// int i; 1901/// float f; 1902/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1903/// // f into the surrounding scope.x 1904/// @endcode 1905/// 1906/// This routine is recursive, injecting the names of nested anonymous 1907/// structs/unions into the owning context and scope as well. 1908static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 1909 DeclContext *Owner, 1910 RecordDecl *AnonRecord, 1911 AccessSpecifier AS, 1912 llvm::SmallVector<NamedDecl*, 2> &Chaining, 1913 bool MSAnonStruct) { 1914 unsigned diagKind 1915 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1916 : diag::err_anonymous_struct_member_redecl; 1917 1918 bool Invalid = false; 1919 1920 // Look every FieldDecl and IndirectFieldDecl with a name. 1921 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 1922 DEnd = AnonRecord->decls_end(); 1923 D != DEnd; ++D) { 1924 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 1925 cast<NamedDecl>(*D)->getDeclName()) { 1926 ValueDecl *VD = cast<ValueDecl>(*D); 1927 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 1928 VD->getLocation(), diagKind)) { 1929 // C++ [class.union]p2: 1930 // The names of the members of an anonymous union shall be 1931 // distinct from the names of any other entity in the 1932 // scope in which the anonymous union is declared. 1933 Invalid = true; 1934 } else { 1935 // C++ [class.union]p2: 1936 // For the purpose of name lookup, after the anonymous union 1937 // definition, the members of the anonymous union are 1938 // considered to have been defined in the scope in which the 1939 // anonymous union is declared. 1940 unsigned OldChainingSize = Chaining.size(); 1941 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 1942 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 1943 PE = IF->chain_end(); PI != PE; ++PI) 1944 Chaining.push_back(*PI); 1945 else 1946 Chaining.push_back(VD); 1947 1948 assert(Chaining.size() >= 2); 1949 NamedDecl **NamedChain = 1950 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 1951 for (unsigned i = 0; i < Chaining.size(); i++) 1952 NamedChain[i] = Chaining[i]; 1953 1954 IndirectFieldDecl* IndirectField = 1955 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 1956 VD->getIdentifier(), VD->getType(), 1957 NamedChain, Chaining.size()); 1958 1959 IndirectField->setAccess(AS); 1960 IndirectField->setImplicit(); 1961 SemaRef.PushOnScopeChains(IndirectField, S); 1962 1963 // That includes picking up the appropriate access specifier. 1964 if (AS != AS_none) IndirectField->setAccess(AS); 1965 1966 Chaining.resize(OldChainingSize); 1967 } 1968 } 1969 } 1970 1971 return Invalid; 1972} 1973 1974/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 1975/// a VarDecl::StorageClass. Any error reporting is up to the caller: 1976/// illegal input values are mapped to SC_None. 1977static StorageClass 1978StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1979 switch (StorageClassSpec) { 1980 case DeclSpec::SCS_unspecified: return SC_None; 1981 case DeclSpec::SCS_extern: return SC_Extern; 1982 case DeclSpec::SCS_static: return SC_Static; 1983 case DeclSpec::SCS_auto: return SC_Auto; 1984 case DeclSpec::SCS_register: return SC_Register; 1985 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 1986 // Illegal SCSs map to None: error reporting is up to the caller. 1987 case DeclSpec::SCS_mutable: // Fall through. 1988 case DeclSpec::SCS_typedef: return SC_None; 1989 } 1990 llvm_unreachable("unknown storage class specifier"); 1991} 1992 1993/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 1994/// a StorageClass. Any error reporting is up to the caller: 1995/// illegal input values are mapped to SC_None. 1996static StorageClass 1997StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1998 switch (StorageClassSpec) { 1999 case DeclSpec::SCS_unspecified: return SC_None; 2000 case DeclSpec::SCS_extern: return SC_Extern; 2001 case DeclSpec::SCS_static: return SC_Static; 2002 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2003 // Illegal SCSs map to None: error reporting is up to the caller. 2004 case DeclSpec::SCS_auto: // Fall through. 2005 case DeclSpec::SCS_mutable: // Fall through. 2006 case DeclSpec::SCS_register: // Fall through. 2007 case DeclSpec::SCS_typedef: return SC_None; 2008 } 2009 llvm_unreachable("unknown storage class specifier"); 2010} 2011 2012/// BuildAnonymousStructOrUnion - Handle the declaration of an 2013/// anonymous structure or union. Anonymous unions are a C++ feature 2014/// (C++ [class.union]) and a GNU C extension; anonymous structures 2015/// are a GNU C and GNU C++ extension. 2016Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2017 AccessSpecifier AS, 2018 RecordDecl *Record) { 2019 DeclContext *Owner = Record->getDeclContext(); 2020 2021 // Diagnose whether this anonymous struct/union is an extension. 2022 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2023 Diag(Record->getLocation(), diag::ext_anonymous_union); 2024 else if (!Record->isUnion()) 2025 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2026 2027 // C and C++ require different kinds of checks for anonymous 2028 // structs/unions. 2029 bool Invalid = false; 2030 if (getLangOptions().CPlusPlus) { 2031 const char* PrevSpec = 0; 2032 unsigned DiagID; 2033 // C++ [class.union]p3: 2034 // Anonymous unions declared in a named namespace or in the 2035 // global namespace shall be declared static. 2036 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2037 (isa<TranslationUnitDecl>(Owner) || 2038 (isa<NamespaceDecl>(Owner) && 2039 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2040 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 2041 Invalid = true; 2042 2043 // Recover by adding 'static'. 2044 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 2045 PrevSpec, DiagID, getLangOptions()); 2046 } 2047 // C++ [class.union]p3: 2048 // A storage class is not allowed in a declaration of an 2049 // anonymous union in a class scope. 2050 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2051 isa<RecordDecl>(Owner)) { 2052 Diag(DS.getStorageClassSpecLoc(), 2053 diag::err_anonymous_union_with_storage_spec); 2054 Invalid = true; 2055 2056 // Recover by removing the storage specifier. 2057 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 2058 PrevSpec, DiagID, getLangOptions()); 2059 } 2060 2061 // C++ [class.union]p2: 2062 // The member-specification of an anonymous union shall only 2063 // define non-static data members. [Note: nested types and 2064 // functions cannot be declared within an anonymous union. ] 2065 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2066 MemEnd = Record->decls_end(); 2067 Mem != MemEnd; ++Mem) { 2068 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2069 // C++ [class.union]p3: 2070 // An anonymous union shall not have private or protected 2071 // members (clause 11). 2072 assert(FD->getAccess() != AS_none); 2073 if (FD->getAccess() != AS_public) { 2074 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2075 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2076 Invalid = true; 2077 } 2078 2079 if (CheckNontrivialField(FD)) 2080 Invalid = true; 2081 } else if ((*Mem)->isImplicit()) { 2082 // Any implicit members are fine. 2083 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2084 // This is a type that showed up in an 2085 // elaborated-type-specifier inside the anonymous struct or 2086 // union, but which actually declares a type outside of the 2087 // anonymous struct or union. It's okay. 2088 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2089 if (!MemRecord->isAnonymousStructOrUnion() && 2090 MemRecord->getDeclName()) { 2091 // Visual C++ allows type definition in anonymous struct or union. 2092 if (getLangOptions().Microsoft) 2093 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2094 << (int)Record->isUnion(); 2095 else { 2096 // This is a nested type declaration. 2097 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2098 << (int)Record->isUnion(); 2099 Invalid = true; 2100 } 2101 } 2102 } else if (isa<AccessSpecDecl>(*Mem)) { 2103 // Any access specifier is fine. 2104 } else { 2105 // We have something that isn't a non-static data 2106 // member. Complain about it. 2107 unsigned DK = diag::err_anonymous_record_bad_member; 2108 if (isa<TypeDecl>(*Mem)) 2109 DK = diag::err_anonymous_record_with_type; 2110 else if (isa<FunctionDecl>(*Mem)) 2111 DK = diag::err_anonymous_record_with_function; 2112 else if (isa<VarDecl>(*Mem)) 2113 DK = diag::err_anonymous_record_with_static; 2114 2115 // Visual C++ allows type definition in anonymous struct or union. 2116 if (getLangOptions().Microsoft && 2117 DK == diag::err_anonymous_record_with_type) 2118 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2119 << (int)Record->isUnion(); 2120 else { 2121 Diag((*Mem)->getLocation(), DK) 2122 << (int)Record->isUnion(); 2123 Invalid = true; 2124 } 2125 } 2126 } 2127 } 2128 2129 if (!Record->isUnion() && !Owner->isRecord()) { 2130 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2131 << (int)getLangOptions().CPlusPlus; 2132 Invalid = true; 2133 } 2134 2135 // Mock up a declarator. 2136 Declarator Dc(DS, Declarator::TypeNameContext); 2137 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2138 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2139 2140 // Create a declaration for this anonymous struct/union. 2141 NamedDecl *Anon = 0; 2142 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2143 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 2144 /*IdentifierInfo=*/0, 2145 Context.getTypeDeclType(Record), 2146 TInfo, 2147 /*BitWidth=*/0, /*Mutable=*/false); 2148 Anon->setAccess(AS); 2149 if (getLangOptions().CPlusPlus) 2150 FieldCollector->Add(cast<FieldDecl>(Anon)); 2151 } else { 2152 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2153 assert(SCSpec != DeclSpec::SCS_typedef && 2154 "Parser allowed 'typedef' as storage class VarDecl."); 2155 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2156 if (SCSpec == DeclSpec::SCS_mutable) { 2157 // mutable can only appear on non-static class members, so it's always 2158 // an error here 2159 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2160 Invalid = true; 2161 SC = SC_None; 2162 } 2163 SCSpec = DS.getStorageClassSpecAsWritten(); 2164 VarDecl::StorageClass SCAsWritten 2165 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2166 2167 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 2168 /*IdentifierInfo=*/0, 2169 Context.getTypeDeclType(Record), 2170 TInfo, SC, SCAsWritten); 2171 } 2172 Anon->setImplicit(); 2173 2174 // Add the anonymous struct/union object to the current 2175 // context. We'll be referencing this object when we refer to one of 2176 // its members. 2177 Owner->addDecl(Anon); 2178 2179 // Inject the members of the anonymous struct/union into the owning 2180 // context and into the identifier resolver chain for name lookup 2181 // purposes. 2182 llvm::SmallVector<NamedDecl*, 2> Chain; 2183 Chain.push_back(Anon); 2184 2185 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2186 Chain, false)) 2187 Invalid = true; 2188 2189 // Mark this as an anonymous struct/union type. Note that we do not 2190 // do this until after we have already checked and injected the 2191 // members of this anonymous struct/union type, because otherwise 2192 // the members could be injected twice: once by DeclContext when it 2193 // builds its lookup table, and once by 2194 // InjectAnonymousStructOrUnionMembers. 2195 Record->setAnonymousStructOrUnion(true); 2196 2197 if (Invalid) 2198 Anon->setInvalidDecl(); 2199 2200 return Anon; 2201} 2202 2203/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2204/// Microsoft C anonymous structure. 2205/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2206/// Example: 2207/// 2208/// struct A { int a; }; 2209/// struct B { struct A; int b; }; 2210/// 2211/// void foo() { 2212/// B var; 2213/// var.a = 3; 2214/// } 2215/// 2216Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2217 RecordDecl *Record) { 2218 2219 // If there is no Record, get the record via the typedef. 2220 if (!Record) 2221 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2222 2223 // Mock up a declarator. 2224 Declarator Dc(DS, Declarator::TypeNameContext); 2225 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2226 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2227 2228 // Create a declaration for this anonymous struct. 2229 NamedDecl* Anon = FieldDecl::Create(Context, 2230 cast<RecordDecl>(CurContext), 2231 DS.getSourceRange().getBegin(), 2232 /*IdentifierInfo=*/0, 2233 Context.getTypeDeclType(Record), 2234 TInfo, 2235 /*BitWidth=*/0, /*Mutable=*/false); 2236 Anon->setImplicit(); 2237 2238 // Add the anonymous struct object to the current context. 2239 CurContext->addDecl(Anon); 2240 2241 // Inject the members of the anonymous struct into the current 2242 // context and into the identifier resolver chain for name lookup 2243 // purposes. 2244 llvm::SmallVector<NamedDecl*, 2> Chain; 2245 Chain.push_back(Anon); 2246 2247 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2248 Record->getDefinition(), 2249 AS_none, Chain, true)) 2250 Anon->setInvalidDecl(); 2251 2252 return Anon; 2253} 2254 2255/// GetNameForDeclarator - Determine the full declaration name for the 2256/// given Declarator. 2257DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2258 return GetNameFromUnqualifiedId(D.getName()); 2259} 2260 2261/// \brief Retrieves the declaration name from a parsed unqualified-id. 2262DeclarationNameInfo 2263Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2264 DeclarationNameInfo NameInfo; 2265 NameInfo.setLoc(Name.StartLocation); 2266 2267 switch (Name.getKind()) { 2268 2269 case UnqualifiedId::IK_Identifier: 2270 NameInfo.setName(Name.Identifier); 2271 NameInfo.setLoc(Name.StartLocation); 2272 return NameInfo; 2273 2274 case UnqualifiedId::IK_OperatorFunctionId: 2275 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2276 Name.OperatorFunctionId.Operator)); 2277 NameInfo.setLoc(Name.StartLocation); 2278 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2279 = Name.OperatorFunctionId.SymbolLocations[0]; 2280 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2281 = Name.EndLocation.getRawEncoding(); 2282 return NameInfo; 2283 2284 case UnqualifiedId::IK_LiteralOperatorId: 2285 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2286 Name.Identifier)); 2287 NameInfo.setLoc(Name.StartLocation); 2288 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2289 return NameInfo; 2290 2291 case UnqualifiedId::IK_ConversionFunctionId: { 2292 TypeSourceInfo *TInfo; 2293 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2294 if (Ty.isNull()) 2295 return DeclarationNameInfo(); 2296 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2297 Context.getCanonicalType(Ty))); 2298 NameInfo.setLoc(Name.StartLocation); 2299 NameInfo.setNamedTypeInfo(TInfo); 2300 return NameInfo; 2301 } 2302 2303 case UnqualifiedId::IK_ConstructorName: { 2304 TypeSourceInfo *TInfo; 2305 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2306 if (Ty.isNull()) 2307 return DeclarationNameInfo(); 2308 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2309 Context.getCanonicalType(Ty))); 2310 NameInfo.setLoc(Name.StartLocation); 2311 NameInfo.setNamedTypeInfo(TInfo); 2312 return NameInfo; 2313 } 2314 2315 case UnqualifiedId::IK_ConstructorTemplateId: { 2316 // In well-formed code, we can only have a constructor 2317 // template-id that refers to the current context, so go there 2318 // to find the actual type being constructed. 2319 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2320 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2321 return DeclarationNameInfo(); 2322 2323 // Determine the type of the class being constructed. 2324 QualType CurClassType = Context.getTypeDeclType(CurClass); 2325 2326 // FIXME: Check two things: that the template-id names the same type as 2327 // CurClassType, and that the template-id does not occur when the name 2328 // was qualified. 2329 2330 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2331 Context.getCanonicalType(CurClassType))); 2332 NameInfo.setLoc(Name.StartLocation); 2333 // FIXME: should we retrieve TypeSourceInfo? 2334 NameInfo.setNamedTypeInfo(0); 2335 return NameInfo; 2336 } 2337 2338 case UnqualifiedId::IK_DestructorName: { 2339 TypeSourceInfo *TInfo; 2340 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2341 if (Ty.isNull()) 2342 return DeclarationNameInfo(); 2343 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2344 Context.getCanonicalType(Ty))); 2345 NameInfo.setLoc(Name.StartLocation); 2346 NameInfo.setNamedTypeInfo(TInfo); 2347 return NameInfo; 2348 } 2349 2350 case UnqualifiedId::IK_TemplateId: { 2351 TemplateName TName = Name.TemplateId->Template.get(); 2352 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2353 return Context.getNameForTemplate(TName, TNameLoc); 2354 } 2355 2356 } // switch (Name.getKind()) 2357 2358 assert(false && "Unknown name kind"); 2359 return DeclarationNameInfo(); 2360} 2361 2362/// isNearlyMatchingFunction - Determine whether the C++ functions 2363/// Declaration and Definition are "nearly" matching. This heuristic 2364/// is used to improve diagnostics in the case where an out-of-line 2365/// function definition doesn't match any declaration within 2366/// the class or namespace. 2367static bool isNearlyMatchingFunction(ASTContext &Context, 2368 FunctionDecl *Declaration, 2369 FunctionDecl *Definition) { 2370 if (Declaration->param_size() != Definition->param_size()) 2371 return false; 2372 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2373 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2374 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2375 2376 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 2377 DefParamTy.getNonReferenceType())) 2378 return false; 2379 } 2380 2381 return true; 2382} 2383 2384/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2385/// declarator needs to be rebuilt in the current instantiation. 2386/// Any bits of declarator which appear before the name are valid for 2387/// consideration here. That's specifically the type in the decl spec 2388/// and the base type in any member-pointer chunks. 2389static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2390 DeclarationName Name) { 2391 // The types we specifically need to rebuild are: 2392 // - typenames, typeofs, and decltypes 2393 // - types which will become injected class names 2394 // Of course, we also need to rebuild any type referencing such a 2395 // type. It's safest to just say "dependent", but we call out a 2396 // few cases here. 2397 2398 DeclSpec &DS = D.getMutableDeclSpec(); 2399 switch (DS.getTypeSpecType()) { 2400 case DeclSpec::TST_typename: 2401 case DeclSpec::TST_typeofType: 2402 case DeclSpec::TST_decltype: { 2403 // Grab the type from the parser. 2404 TypeSourceInfo *TSI = 0; 2405 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 2406 if (T.isNull() || !T->isDependentType()) break; 2407 2408 // Make sure there's a type source info. This isn't really much 2409 // of a waste; most dependent types should have type source info 2410 // attached already. 2411 if (!TSI) 2412 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2413 2414 // Rebuild the type in the current instantiation. 2415 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2416 if (!TSI) return true; 2417 2418 // Store the new type back in the decl spec. 2419 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 2420 DS.UpdateTypeRep(LocType); 2421 break; 2422 } 2423 2424 case DeclSpec::TST_typeofExpr: { 2425 Expr *E = DS.getRepAsExpr(); 2426 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 2427 if (Result.isInvalid()) return true; 2428 DS.UpdateExprRep(Result.get()); 2429 break; 2430 } 2431 2432 default: 2433 // Nothing to do for these decl specs. 2434 break; 2435 } 2436 2437 // It doesn't matter what order we do this in. 2438 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2439 DeclaratorChunk &Chunk = D.getTypeObject(I); 2440 2441 // The only type information in the declarator which can come 2442 // before the declaration name is the base type of a member 2443 // pointer. 2444 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2445 continue; 2446 2447 // Rebuild the scope specifier in-place. 2448 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2449 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2450 return true; 2451 } 2452 2453 return false; 2454} 2455 2456Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 2457 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), false); 2458} 2459 2460Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 2461 MultiTemplateParamsArg TemplateParamLists, 2462 bool IsFunctionDefinition) { 2463 // TODO: consider using NameInfo for diagnostic. 2464 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 2465 DeclarationName Name = NameInfo.getName(); 2466 2467 // All of these full declarators require an identifier. If it doesn't have 2468 // one, the ParsedFreeStandingDeclSpec action should be used. 2469 if (!Name) { 2470 if (!D.isInvalidType()) // Reject this if we think it is valid. 2471 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2472 diag::err_declarator_need_ident) 2473 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2474 return 0; 2475 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 2476 return 0; 2477 2478 // The scope passed in may not be a decl scope. Zip up the scope tree until 2479 // we find one that is. 2480 while ((S->getFlags() & Scope::DeclScope) == 0 || 2481 (S->getFlags() & Scope::TemplateParamScope) != 0) 2482 S = S->getParent(); 2483 2484 DeclContext *DC = CurContext; 2485 if (D.getCXXScopeSpec().isInvalid()) 2486 D.setInvalidType(); 2487 else if (D.getCXXScopeSpec().isSet()) { 2488 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 2489 UPPC_DeclarationQualifier)) 2490 return 0; 2491 2492 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2493 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2494 if (!DC) { 2495 // If we could not compute the declaration context, it's because the 2496 // declaration context is dependent but does not refer to a class, 2497 // class template, or class template partial specialization. Complain 2498 // and return early, to avoid the coming semantic disaster. 2499 Diag(D.getIdentifierLoc(), 2500 diag::err_template_qualified_declarator_no_match) 2501 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2502 << D.getCXXScopeSpec().getRange(); 2503 return 0; 2504 } 2505 2506 bool IsDependentContext = DC->isDependentContext(); 2507 2508 if (!IsDependentContext && 2509 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2510 return 0; 2511 2512 if (isa<CXXRecordDecl>(DC)) { 2513 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 2514 Diag(D.getIdentifierLoc(), 2515 diag::err_member_def_undefined_record) 2516 << Name << DC << D.getCXXScopeSpec().getRange(); 2517 D.setInvalidType(); 2518 } else if (isa<CXXRecordDecl>(CurContext) && 2519 !D.getDeclSpec().isFriendSpecified()) { 2520 // The user provided a superfluous scope specifier inside a class 2521 // definition: 2522 // 2523 // class X { 2524 // void X::f(); 2525 // }; 2526 if (CurContext->Equals(DC)) 2527 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 2528 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 2529 else 2530 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 2531 << Name << D.getCXXScopeSpec().getRange(); 2532 2533 // Pretend that this qualifier was not here. 2534 D.getCXXScopeSpec().clear(); 2535 } 2536 } 2537 2538 // Check whether we need to rebuild the type of the given 2539 // declaration in the current instantiation. 2540 if (EnteringContext && IsDependentContext && 2541 TemplateParamLists.size() != 0) { 2542 ContextRAII SavedContext(*this, DC); 2543 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 2544 D.setInvalidType(); 2545 } 2546 } 2547 2548 // C++ [class.mem]p13: 2549 // If T is the name of a class, then each of the following shall have a 2550 // name different from T: 2551 // - every static data member of class T; 2552 // - every member function of class T 2553 // - every member of class T that is itself a type; 2554 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 2555 if (Record->getIdentifier() && Record->getDeclName() == Name) { 2556 Diag(D.getIdentifierLoc(), diag::err_member_name_of_class) 2557 << Name; 2558 2559 // If this is a typedef, we'll end up spewing multiple diagnostics. 2560 // Just return early; it's safer. 2561 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2562 return 0; 2563 } 2564 2565 NamedDecl *New; 2566 2567 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 2568 QualType R = TInfo->getType(); 2569 2570 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 2571 UPPC_DeclarationType)) 2572 D.setInvalidType(); 2573 2574 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 2575 ForRedeclaration); 2576 2577 // See if this is a redefinition of a variable in the same scope. 2578 if (!D.getCXXScopeSpec().isSet()) { 2579 bool IsLinkageLookup = false; 2580 2581 // If the declaration we're planning to build will be a function 2582 // or object with linkage, then look for another declaration with 2583 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 2584 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2585 /* Do nothing*/; 2586 else if (R->isFunctionType()) { 2587 if (CurContext->isFunctionOrMethod() || 2588 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2589 IsLinkageLookup = true; 2590 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 2591 IsLinkageLookup = true; 2592 else if (CurContext->getRedeclContext()->isTranslationUnit() && 2593 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2594 IsLinkageLookup = true; 2595 2596 if (IsLinkageLookup) 2597 Previous.clear(LookupRedeclarationWithLinkage); 2598 2599 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 2600 } else { // Something like "int foo::x;" 2601 LookupQualifiedName(Previous, DC); 2602 2603 // Don't consider using declarations as previous declarations for 2604 // out-of-line members. 2605 RemoveUsingDecls(Previous); 2606 2607 // C++ 7.3.1.2p2: 2608 // Members (including explicit specializations of templates) of a named 2609 // namespace can also be defined outside that namespace by explicit 2610 // qualification of the name being defined, provided that the entity being 2611 // defined was already declared in the namespace and the definition appears 2612 // after the point of declaration in a namespace that encloses the 2613 // declarations namespace. 2614 // 2615 // Note that we only check the context at this point. We don't yet 2616 // have enough information to make sure that PrevDecl is actually 2617 // the declaration we want to match. For example, given: 2618 // 2619 // class X { 2620 // void f(); 2621 // void f(float); 2622 // }; 2623 // 2624 // void X::f(int) { } // ill-formed 2625 // 2626 // In this case, PrevDecl will point to the overload set 2627 // containing the two f's declared in X, but neither of them 2628 // matches. 2629 2630 // First check whether we named the global scope. 2631 if (isa<TranslationUnitDecl>(DC)) { 2632 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 2633 << Name << D.getCXXScopeSpec().getRange(); 2634 } else { 2635 DeclContext *Cur = CurContext; 2636 while (isa<LinkageSpecDecl>(Cur)) 2637 Cur = Cur->getParent(); 2638 if (!Cur->Encloses(DC)) { 2639 // The qualifying scope doesn't enclose the original declaration. 2640 // Emit diagnostic based on current scope. 2641 SourceLocation L = D.getIdentifierLoc(); 2642 SourceRange R = D.getCXXScopeSpec().getRange(); 2643 if (isa<FunctionDecl>(Cur)) 2644 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 2645 else 2646 Diag(L, diag::err_invalid_declarator_scope) 2647 << Name << cast<NamedDecl>(DC) << R; 2648 D.setInvalidType(); 2649 } 2650 } 2651 } 2652 2653 if (Previous.isSingleResult() && 2654 Previous.getFoundDecl()->isTemplateParameter()) { 2655 // Maybe we will complain about the shadowed template parameter. 2656 if (!D.isInvalidType()) 2657 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2658 Previous.getFoundDecl())) 2659 D.setInvalidType(); 2660 2661 // Just pretend that we didn't see the previous declaration. 2662 Previous.clear(); 2663 } 2664 2665 // In C++, the previous declaration we find might be a tag type 2666 // (class or enum). In this case, the new declaration will hide the 2667 // tag type. Note that this does does not apply if we're declaring a 2668 // typedef (C++ [dcl.typedef]p4). 2669 if (Previous.isSingleTagDecl() && 2670 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2671 Previous.clear(); 2672 2673 bool Redeclaration = false; 2674 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2675 if (TemplateParamLists.size()) { 2676 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2677 return 0; 2678 } 2679 2680 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2681 } else if (R->isFunctionType()) { 2682 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2683 move(TemplateParamLists), 2684 IsFunctionDefinition, Redeclaration); 2685 } else { 2686 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2687 move(TemplateParamLists), 2688 Redeclaration); 2689 } 2690 2691 if (New == 0) 2692 return 0; 2693 2694 // If this has an identifier and is not an invalid redeclaration or 2695 // function template specialization, add it to the scope stack. 2696 if (New->getDeclName() && !(Redeclaration && New->isInvalidDecl())) 2697 PushOnScopeChains(New, S); 2698 2699 return New; 2700} 2701 2702/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2703/// types into constant array types in certain situations which would otherwise 2704/// be errors (for GCC compatibility). 2705static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2706 ASTContext &Context, 2707 bool &SizeIsNegative, 2708 llvm::APSInt &Oversized) { 2709 // This method tries to turn a variable array into a constant 2710 // array even when the size isn't an ICE. This is necessary 2711 // for compatibility with code that depends on gcc's buggy 2712 // constant expression folding, like struct {char x[(int)(char*)2];} 2713 SizeIsNegative = false; 2714 Oversized = 0; 2715 2716 if (T->isDependentType()) 2717 return QualType(); 2718 2719 QualifierCollector Qs; 2720 const Type *Ty = Qs.strip(T); 2721 2722 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2723 QualType Pointee = PTy->getPointeeType(); 2724 QualType FixedType = 2725 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 2726 Oversized); 2727 if (FixedType.isNull()) return FixedType; 2728 FixedType = Context.getPointerType(FixedType); 2729 return Qs.apply(Context, FixedType); 2730 } 2731 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 2732 QualType Inner = PTy->getInnerType(); 2733 QualType FixedType = 2734 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 2735 Oversized); 2736 if (FixedType.isNull()) return FixedType; 2737 FixedType = Context.getParenType(FixedType); 2738 return Qs.apply(Context, FixedType); 2739 } 2740 2741 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2742 if (!VLATy) 2743 return QualType(); 2744 // FIXME: We should probably handle this case 2745 if (VLATy->getElementType()->isVariablyModifiedType()) 2746 return QualType(); 2747 2748 Expr::EvalResult EvalResult; 2749 if (!VLATy->getSizeExpr() || 2750 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2751 !EvalResult.Val.isInt()) 2752 return QualType(); 2753 2754 // Check whether the array size is negative. 2755 llvm::APSInt &Res = EvalResult.Val.getInt(); 2756 if (Res.isSigned() && Res.isNegative()) { 2757 SizeIsNegative = true; 2758 return QualType(); 2759 } 2760 2761 // Check whether the array is too large to be addressed. 2762 unsigned ActiveSizeBits 2763 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 2764 Res); 2765 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 2766 Oversized = Res; 2767 return QualType(); 2768 } 2769 2770 return Context.getConstantArrayType(VLATy->getElementType(), 2771 Res, ArrayType::Normal, 0); 2772} 2773 2774/// \brief Register the given locally-scoped external C declaration so 2775/// that it can be found later for redeclarations 2776void 2777Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2778 const LookupResult &Previous, 2779 Scope *S) { 2780 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2781 "Decl is not a locally-scoped decl!"); 2782 // Note that we have a locally-scoped external with this name. 2783 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2784 2785 if (!Previous.isSingleResult()) 2786 return; 2787 2788 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2789 2790 // If there was a previous declaration of this variable, it may be 2791 // in our identifier chain. Update the identifier chain with the new 2792 // declaration. 2793 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2794 // The previous declaration was found on the identifer resolver 2795 // chain, so remove it from its scope. 2796 while (S && !S->isDeclScope(PrevDecl)) 2797 S = S->getParent(); 2798 2799 if (S) 2800 S->RemoveDecl(PrevDecl); 2801 } 2802} 2803 2804/// \brief Diagnose function specifiers on a declaration of an identifier that 2805/// does not identify a function. 2806void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2807 // FIXME: We should probably indicate the identifier in question to avoid 2808 // confusion for constructs like "inline int a(), b;" 2809 if (D.getDeclSpec().isInlineSpecified()) 2810 Diag(D.getDeclSpec().getInlineSpecLoc(), 2811 diag::err_inline_non_function); 2812 2813 if (D.getDeclSpec().isVirtualSpecified()) 2814 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2815 diag::err_virtual_non_function); 2816 2817 if (D.getDeclSpec().isExplicitSpecified()) 2818 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2819 diag::err_explicit_non_function); 2820} 2821 2822NamedDecl* 2823Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2824 QualType R, TypeSourceInfo *TInfo, 2825 LookupResult &Previous, bool &Redeclaration) { 2826 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2827 if (D.getCXXScopeSpec().isSet()) { 2828 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2829 << D.getCXXScopeSpec().getRange(); 2830 D.setInvalidType(); 2831 // Pretend we didn't see the scope specifier. 2832 DC = CurContext; 2833 Previous.clear(); 2834 } 2835 2836 if (getLangOptions().CPlusPlus) { 2837 // Check that there are no default arguments (C++ only). 2838 CheckExtraCXXDefaultArguments(D); 2839 } 2840 2841 DiagnoseFunctionSpecifiers(D); 2842 2843 if (D.getDeclSpec().isThreadSpecified()) 2844 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2845 2846 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 2847 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 2848 << D.getName().getSourceRange(); 2849 return 0; 2850 } 2851 2852 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2853 if (!NewTD) return 0; 2854 2855 // Handle attributes prior to checking for duplicates in MergeVarDecl 2856 ProcessDeclAttributes(S, NewTD, D); 2857 2858 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2859 // then it shall have block scope. 2860 // Note that variably modified types must be fixed before merging the decl so 2861 // that redeclarations will match. 2862 QualType T = NewTD->getUnderlyingType(); 2863 if (T->isVariablyModifiedType()) { 2864 getCurFunction()->setHasBranchProtectedScope(); 2865 2866 if (S->getFnParent() == 0) { 2867 bool SizeIsNegative; 2868 llvm::APSInt Oversized; 2869 QualType FixedTy = 2870 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 2871 Oversized); 2872 if (!FixedTy.isNull()) { 2873 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2874 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2875 } else { 2876 if (SizeIsNegative) 2877 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2878 else if (T->isVariableArrayType()) 2879 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2880 else if (Oversized.getBoolValue()) 2881 Diag(D.getIdentifierLoc(), diag::err_array_too_large) 2882 << Oversized.toString(10); 2883 else 2884 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2885 NewTD->setInvalidDecl(); 2886 } 2887 } 2888 } 2889 2890 // Merge the decl with the existing one if appropriate. If the decl is 2891 // in an outer scope, it isn't the same thing. 2892 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false, 2893 /*ExplicitInstantiationOrSpecialization=*/false); 2894 if (!Previous.empty()) { 2895 Redeclaration = true; 2896 MergeTypeDefDecl(NewTD, Previous); 2897 } 2898 2899 // If this is the C FILE type, notify the AST context. 2900 if (IdentifierInfo *II = NewTD->getIdentifier()) 2901 if (!NewTD->isInvalidDecl() && 2902 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 2903 if (II->isStr("FILE")) 2904 Context.setFILEDecl(NewTD); 2905 else if (II->isStr("jmp_buf")) 2906 Context.setjmp_bufDecl(NewTD); 2907 else if (II->isStr("sigjmp_buf")) 2908 Context.setsigjmp_bufDecl(NewTD); 2909 else if (II->isStr("__builtin_va_list")) 2910 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 2911 } 2912 2913 return NewTD; 2914} 2915 2916/// \brief Determines whether the given declaration is an out-of-scope 2917/// previous declaration. 2918/// 2919/// This routine should be invoked when name lookup has found a 2920/// previous declaration (PrevDecl) that is not in the scope where a 2921/// new declaration by the same name is being introduced. If the new 2922/// declaration occurs in a local scope, previous declarations with 2923/// linkage may still be considered previous declarations (C99 2924/// 6.2.2p4-5, C++ [basic.link]p6). 2925/// 2926/// \param PrevDecl the previous declaration found by name 2927/// lookup 2928/// 2929/// \param DC the context in which the new declaration is being 2930/// declared. 2931/// 2932/// \returns true if PrevDecl is an out-of-scope previous declaration 2933/// for a new delcaration with the same name. 2934static bool 2935isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2936 ASTContext &Context) { 2937 if (!PrevDecl) 2938 return false; 2939 2940 if (!PrevDecl->hasLinkage()) 2941 return false; 2942 2943 if (Context.getLangOptions().CPlusPlus) { 2944 // C++ [basic.link]p6: 2945 // If there is a visible declaration of an entity with linkage 2946 // having the same name and type, ignoring entities declared 2947 // outside the innermost enclosing namespace scope, the block 2948 // scope declaration declares that same entity and receives the 2949 // linkage of the previous declaration. 2950 DeclContext *OuterContext = DC->getRedeclContext(); 2951 if (!OuterContext->isFunctionOrMethod()) 2952 // This rule only applies to block-scope declarations. 2953 return false; 2954 2955 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2956 if (PrevOuterContext->isRecord()) 2957 // We found a member function: ignore it. 2958 return false; 2959 2960 // Find the innermost enclosing namespace for the new and 2961 // previous declarations. 2962 OuterContext = OuterContext->getEnclosingNamespaceContext(); 2963 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 2964 2965 // The previous declaration is in a different namespace, so it 2966 // isn't the same function. 2967 if (!OuterContext->Equals(PrevOuterContext)) 2968 return false; 2969 } 2970 2971 return true; 2972} 2973 2974static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 2975 CXXScopeSpec &SS = D.getCXXScopeSpec(); 2976 if (!SS.isSet()) return; 2977 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 2978} 2979 2980NamedDecl* 2981Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 2982 QualType R, TypeSourceInfo *TInfo, 2983 LookupResult &Previous, 2984 MultiTemplateParamsArg TemplateParamLists, 2985 bool &Redeclaration) { 2986 DeclarationName Name = GetNameForDeclarator(D).getName(); 2987 2988 // Check that there are no default arguments (C++ only). 2989 if (getLangOptions().CPlusPlus) 2990 CheckExtraCXXDefaultArguments(D); 2991 2992 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 2993 assert(SCSpec != DeclSpec::SCS_typedef && 2994 "Parser allowed 'typedef' as storage class VarDecl."); 2995 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2996 if (SCSpec == DeclSpec::SCS_mutable) { 2997 // mutable can only appear on non-static class members, so it's always 2998 // an error here 2999 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3000 D.setInvalidType(); 3001 SC = SC_None; 3002 } 3003 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3004 VarDecl::StorageClass SCAsWritten 3005 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3006 3007 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3008 if (!II) { 3009 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3010 << Name.getAsString(); 3011 return 0; 3012 } 3013 3014 DiagnoseFunctionSpecifiers(D); 3015 3016 if (!DC->isRecord() && S->getFnParent() == 0) { 3017 // C99 6.9p2: The storage-class specifiers auto and register shall not 3018 // appear in the declaration specifiers in an external declaration. 3019 if (SC == SC_Auto || SC == SC_Register) { 3020 3021 // If this is a register variable with an asm label specified, then this 3022 // is a GNU extension. 3023 if (SC == SC_Register && D.getAsmLabel()) 3024 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3025 else 3026 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3027 D.setInvalidType(); 3028 } 3029 } 3030 3031 bool isExplicitSpecialization = false; 3032 VarDecl *NewVD; 3033 if (!getLangOptions().CPlusPlus) { 3034 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 3035 II, R, TInfo, SC, SCAsWritten); 3036 3037 if (D.isInvalidType()) 3038 NewVD->setInvalidDecl(); 3039 } else { 3040 if (DC->isRecord() && !CurContext->isRecord()) { 3041 // This is an out-of-line definition of a static data member. 3042 if (SC == SC_Static) { 3043 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3044 diag::err_static_out_of_line) 3045 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3046 } else if (SC == SC_None) 3047 SC = SC_Static; 3048 } 3049 if (SC == SC_Static) { 3050 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3051 if (RD->isLocalClass()) 3052 Diag(D.getIdentifierLoc(), 3053 diag::err_static_data_member_not_allowed_in_local_class) 3054 << Name << RD->getDeclName(); 3055 3056 // C++ [class.union]p1: If a union contains a static data member, 3057 // the program is ill-formed. 3058 // 3059 // We also disallow static data members in anonymous structs. 3060 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3061 Diag(D.getIdentifierLoc(), 3062 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3063 << Name << RD->isUnion(); 3064 } 3065 } 3066 3067 // Match up the template parameter lists with the scope specifier, then 3068 // determine whether we have a template or a template specialization. 3069 isExplicitSpecialization = false; 3070 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 3071 bool Invalid = false; 3072 if (TemplateParameterList *TemplateParams 3073 = MatchTemplateParametersToScopeSpecifier( 3074 D.getDeclSpec().getSourceRange().getBegin(), 3075 D.getCXXScopeSpec(), 3076 TemplateParamLists.get(), 3077 TemplateParamLists.size(), 3078 /*never a friend*/ false, 3079 isExplicitSpecialization, 3080 Invalid)) { 3081 // All but one template parameter lists have been matching. 3082 --NumMatchedTemplateParamLists; 3083 3084 if (TemplateParams->size() > 0) { 3085 // There is no such thing as a variable template. 3086 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3087 << II 3088 << SourceRange(TemplateParams->getTemplateLoc(), 3089 TemplateParams->getRAngleLoc()); 3090 return 0; 3091 } else { 3092 // There is an extraneous 'template<>' for this variable. Complain 3093 // about it, but allow the declaration of the variable. 3094 Diag(TemplateParams->getTemplateLoc(), 3095 diag::err_template_variable_noparams) 3096 << II 3097 << SourceRange(TemplateParams->getTemplateLoc(), 3098 TemplateParams->getRAngleLoc()); 3099 3100 isExplicitSpecialization = true; 3101 } 3102 } 3103 3104 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 3105 II, R, TInfo, SC, SCAsWritten); 3106 3107 // If this decl has an auto type in need of deduction, make a note of the 3108 // Decl so we can diagnose uses of it in its own initializer. 3109 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3110 R->getContainedAutoType()) 3111 ParsingInitForAutoVars.insert(NewVD); 3112 3113 if (D.isInvalidType() || Invalid) 3114 NewVD->setInvalidDecl(); 3115 3116 SetNestedNameSpecifier(NewVD, D); 3117 3118 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 3119 NewVD->setTemplateParameterListsInfo(Context, 3120 NumMatchedTemplateParamLists, 3121 TemplateParamLists.release()); 3122 } 3123 } 3124 3125 if (D.getDeclSpec().isThreadSpecified()) { 3126 if (NewVD->hasLocalStorage()) 3127 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3128 else if (!Context.Target.isTLSSupported()) 3129 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3130 else 3131 NewVD->setThreadSpecified(true); 3132 } 3133 3134 // Set the lexical context. If the declarator has a C++ scope specifier, the 3135 // lexical context will be different from the semantic context. 3136 NewVD->setLexicalDeclContext(CurContext); 3137 3138 // Handle attributes prior to checking for duplicates in MergeVarDecl 3139 ProcessDeclAttributes(S, NewVD, D); 3140 3141 // Handle GNU asm-label extension (encoded as an attribute). 3142 if (Expr *E = (Expr*)D.getAsmLabel()) { 3143 // The parser guarantees this is a string. 3144 StringLiteral *SE = cast<StringLiteral>(E); 3145 llvm::StringRef Label = SE->getString(); 3146 if (S->getFnParent() != 0) { 3147 switch (SC) { 3148 case SC_None: 3149 case SC_Auto: 3150 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3151 break; 3152 case SC_Register: 3153 if (!Context.Target.isValidGCCRegisterName(Label)) 3154 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3155 break; 3156 case SC_Static: 3157 case SC_Extern: 3158 case SC_PrivateExtern: 3159 break; 3160 } 3161 } 3162 3163 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3164 Context, Label)); 3165 } 3166 3167 // Diagnose shadowed variables before filtering for scope. 3168 if (!D.getCXXScopeSpec().isSet()) 3169 CheckShadow(S, NewVD, Previous); 3170 3171 // Don't consider existing declarations that are in a different 3172 // scope and are out-of-semantic-context declarations (if the new 3173 // declaration has linkage). 3174 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage(), 3175 isExplicitSpecialization); 3176 3177 if (!getLangOptions().CPlusPlus) 3178 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3179 else { 3180 // Merge the decl with the existing one if appropriate. 3181 if (!Previous.empty()) { 3182 if (Previous.isSingleResult() && 3183 isa<FieldDecl>(Previous.getFoundDecl()) && 3184 D.getCXXScopeSpec().isSet()) { 3185 // The user tried to define a non-static data member 3186 // out-of-line (C++ [dcl.meaning]p1). 3187 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3188 << D.getCXXScopeSpec().getRange(); 3189 Previous.clear(); 3190 NewVD->setInvalidDecl(); 3191 } 3192 } else if (D.getCXXScopeSpec().isSet()) { 3193 // No previous declaration in the qualifying scope. 3194 Diag(D.getIdentifierLoc(), diag::err_no_member) 3195 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3196 << D.getCXXScopeSpec().getRange(); 3197 NewVD->setInvalidDecl(); 3198 } 3199 3200 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3201 3202 // This is an explicit specialization of a static data member. Check it. 3203 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3204 CheckMemberSpecialization(NewVD, Previous)) 3205 NewVD->setInvalidDecl(); 3206 } 3207 3208 // attributes declared post-definition are currently ignored 3209 // FIXME: This should be handled in attribute merging, not 3210 // here. 3211 if (Previous.isSingleResult()) { 3212 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3213 if (Def && (Def = Def->getDefinition()) && 3214 Def != NewVD && D.hasAttributes()) { 3215 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3216 Diag(Def->getLocation(), diag::note_previous_definition); 3217 } 3218 } 3219 3220 // If this is a locally-scoped extern C variable, update the map of 3221 // such variables. 3222 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3223 !NewVD->isInvalidDecl()) 3224 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3225 3226 // If there's a #pragma GCC visibility in scope, and this isn't a class 3227 // member, set the visibility of this variable. 3228 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3229 AddPushedVisibilityAttribute(NewVD); 3230 3231 MarkUnusedFileScopedDecl(NewVD); 3232 3233 return NewVD; 3234} 3235 3236/// \brief Diagnose variable or built-in function shadowing. Implements 3237/// -Wshadow. 3238/// 3239/// This method is called whenever a VarDecl is added to a "useful" 3240/// scope. 3241/// 3242/// \param S the scope in which the shadowing name is being declared 3243/// \param R the lookup of the name 3244/// 3245void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 3246 // Return if warning is ignored. 3247 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 3248 Diagnostic::Ignored) 3249 return; 3250 3251 // Don't diagnose declarations at file scope. 3252 DeclContext *NewDC = D->getDeclContext(); 3253 if (NewDC->isFileContext()) 3254 return; 3255 3256 // Only diagnose if we're shadowing an unambiguous field or variable. 3257 if (R.getResultKind() != LookupResult::Found) 3258 return; 3259 3260 NamedDecl* ShadowedDecl = R.getFoundDecl(); 3261 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 3262 return; 3263 3264 // Fields are not shadowed by variables in C++ static methods. 3265 if (isa<FieldDecl>(ShadowedDecl)) 3266 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 3267 if (MD->isStatic()) 3268 return; 3269 3270 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 3271 if (shadowedVar->isExternC()) { 3272 // Don't warn for this case: 3273 // 3274 // @code 3275 // extern int bob; 3276 // void f() { 3277 // extern int bob; 3278 // } 3279 // @endcode 3280 if (D->isExternC()) 3281 return; 3282 3283 // For shadowing external vars, make sure that we point to the global 3284 // declaration, not a locally scoped extern declaration. 3285 for (VarDecl::redecl_iterator 3286 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 3287 I != E; ++I) 3288 if (I->isFileVarDecl()) { 3289 ShadowedDecl = *I; 3290 break; 3291 } 3292 } 3293 3294 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 3295 3296 // Only warn about certain kinds of shadowing for class members. 3297 if (NewDC && NewDC->isRecord()) { 3298 // In particular, don't warn about shadowing non-class members. 3299 if (!OldDC->isRecord()) 3300 return; 3301 3302 // TODO: should we warn about static data members shadowing 3303 // static data members from base classes? 3304 3305 // TODO: don't diagnose for inaccessible shadowed members. 3306 // This is hard to do perfectly because we might friend the 3307 // shadowing context, but that's just a false negative. 3308 } 3309 3310 // Determine what kind of declaration we're shadowing. 3311 unsigned Kind; 3312 if (isa<RecordDecl>(OldDC)) { 3313 if (isa<FieldDecl>(ShadowedDecl)) 3314 Kind = 3; // field 3315 else 3316 Kind = 2; // static data member 3317 } else if (OldDC->isFileContext()) 3318 Kind = 1; // global 3319 else 3320 Kind = 0; // local 3321 3322 DeclarationName Name = R.getLookupName(); 3323 3324 // Emit warning and note. 3325 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 3326 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 3327} 3328 3329/// \brief Check -Wshadow without the advantage of a previous lookup. 3330void Sema::CheckShadow(Scope *S, VarDecl *D) { 3331 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 3332 Diagnostic::Ignored) 3333 return; 3334 3335 LookupResult R(*this, D->getDeclName(), D->getLocation(), 3336 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 3337 LookupName(R, S); 3338 CheckShadow(S, D, R); 3339} 3340 3341/// \brief Perform semantic checking on a newly-created variable 3342/// declaration. 3343/// 3344/// This routine performs all of the type-checking required for a 3345/// variable declaration once it has been built. It is used both to 3346/// check variables after they have been parsed and their declarators 3347/// have been translated into a declaration, and to check variables 3348/// that have been instantiated from a template. 3349/// 3350/// Sets NewVD->isInvalidDecl() if an error was encountered. 3351void Sema::CheckVariableDeclaration(VarDecl *NewVD, 3352 LookupResult &Previous, 3353 bool &Redeclaration) { 3354 // If the decl is already known invalid, don't check it. 3355 if (NewVD->isInvalidDecl()) 3356 return; 3357 3358 QualType T = NewVD->getType(); 3359 3360 if (T->isObjCObjectType()) { 3361 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 3362 return NewVD->setInvalidDecl(); 3363 } 3364 3365 // Emit an error if an address space was applied to decl with local storage. 3366 // This includes arrays of objects with address space qualifiers, but not 3367 // automatic variables that point to other address spaces. 3368 // ISO/IEC TR 18037 S5.1.2 3369 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 3370 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 3371 return NewVD->setInvalidDecl(); 3372 } 3373 3374 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 3375 && !NewVD->hasAttr<BlocksAttr>()) 3376 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 3377 3378 bool isVM = T->isVariablyModifiedType(); 3379 if (isVM || NewVD->hasAttr<CleanupAttr>() || 3380 NewVD->hasAttr<BlocksAttr>()) 3381 getCurFunction()->setHasBranchProtectedScope(); 3382 3383 if ((isVM && NewVD->hasLinkage()) || 3384 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 3385 bool SizeIsNegative; 3386 llvm::APSInt Oversized; 3387 QualType FixedTy = 3388 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3389 Oversized); 3390 3391 if (FixedTy.isNull() && T->isVariableArrayType()) { 3392 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 3393 // FIXME: This won't give the correct result for 3394 // int a[10][n]; 3395 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 3396 3397 if (NewVD->isFileVarDecl()) 3398 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 3399 << SizeRange; 3400 else if (NewVD->getStorageClass() == SC_Static) 3401 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 3402 << SizeRange; 3403 else 3404 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 3405 << SizeRange; 3406 return NewVD->setInvalidDecl(); 3407 } 3408 3409 if (FixedTy.isNull()) { 3410 if (NewVD->isFileVarDecl()) 3411 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 3412 else 3413 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 3414 return NewVD->setInvalidDecl(); 3415 } 3416 3417 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 3418 NewVD->setType(FixedTy); 3419 } 3420 3421 if (Previous.empty() && NewVD->isExternC()) { 3422 // Since we did not find anything by this name and we're declaring 3423 // an extern "C" variable, look for a non-visible extern "C" 3424 // declaration with the same name. 3425 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3426 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 3427 if (Pos != LocallyScopedExternalDecls.end()) 3428 Previous.addDecl(Pos->second); 3429 } 3430 3431 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 3432 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 3433 << T; 3434 return NewVD->setInvalidDecl(); 3435 } 3436 3437 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 3438 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 3439 return NewVD->setInvalidDecl(); 3440 } 3441 3442 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 3443 Diag(NewVD->getLocation(), diag::err_block_on_vm); 3444 return NewVD->setInvalidDecl(); 3445 } 3446 3447 // Function pointers and references cannot have qualified function type, only 3448 // function pointer-to-members can do that. 3449 QualType Pointee; 3450 unsigned PtrOrRef = 0; 3451 if (const PointerType *Ptr = T->getAs<PointerType>()) 3452 Pointee = Ptr->getPointeeType(); 3453 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 3454 Pointee = Ref->getPointeeType(); 3455 PtrOrRef = 1; 3456 } 3457 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 3458 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 3459 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 3460 << PtrOrRef; 3461 return NewVD->setInvalidDecl(); 3462 } 3463 3464 if (!Previous.empty()) { 3465 Redeclaration = true; 3466 MergeVarDecl(NewVD, Previous); 3467 } 3468} 3469 3470/// \brief Data used with FindOverriddenMethod 3471struct FindOverriddenMethodData { 3472 Sema *S; 3473 CXXMethodDecl *Method; 3474}; 3475 3476/// \brief Member lookup function that determines whether a given C++ 3477/// method overrides a method in a base class, to be used with 3478/// CXXRecordDecl::lookupInBases(). 3479static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 3480 CXXBasePath &Path, 3481 void *UserData) { 3482 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3483 3484 FindOverriddenMethodData *Data 3485 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 3486 3487 DeclarationName Name = Data->Method->getDeclName(); 3488 3489 // FIXME: Do we care about other names here too? 3490 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3491 // We really want to find the base class destructor here. 3492 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 3493 CanQualType CT = Data->S->Context.getCanonicalType(T); 3494 3495 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 3496 } 3497 3498 for (Path.Decls = BaseRecord->lookup(Name); 3499 Path.Decls.first != Path.Decls.second; 3500 ++Path.Decls.first) { 3501 NamedDecl *D = *Path.Decls.first; 3502 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3503 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 3504 return true; 3505 } 3506 } 3507 3508 return false; 3509} 3510 3511/// AddOverriddenMethods - See if a method overrides any in the base classes, 3512/// and if so, check that it's a valid override and remember it. 3513bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 3514 // Look for virtual methods in base classes that this method might override. 3515 CXXBasePaths Paths; 3516 FindOverriddenMethodData Data; 3517 Data.Method = MD; 3518 Data.S = this; 3519 bool AddedAny = false; 3520 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 3521 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 3522 E = Paths.found_decls_end(); I != E; ++I) { 3523 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 3524 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 3525 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 3526 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 3527 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 3528 AddedAny = true; 3529 } 3530 } 3531 } 3532 } 3533 3534 return AddedAny; 3535} 3536 3537static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD) { 3538 LookupResult Prev(S, NewFD->getDeclName(), NewFD->getLocation(), 3539 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 3540 S.LookupQualifiedName(Prev, NewFD->getDeclContext()); 3541 assert(!Prev.isAmbiguous() && 3542 "Cannot have an ambiguity in previous-declaration lookup"); 3543 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3544 Func != FuncEnd; ++Func) { 3545 if (isa<FunctionDecl>(*Func) && 3546 isNearlyMatchingFunction(S.Context, cast<FunctionDecl>(*Func), NewFD)) 3547 S.Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3548 } 3549} 3550 3551NamedDecl* 3552Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3553 QualType R, TypeSourceInfo *TInfo, 3554 LookupResult &Previous, 3555 MultiTemplateParamsArg TemplateParamLists, 3556 bool IsFunctionDefinition, bool &Redeclaration) { 3557 assert(R.getTypePtr()->isFunctionType()); 3558 3559 // TODO: consider using NameInfo for diagnostic. 3560 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3561 DeclarationName Name = NameInfo.getName(); 3562 FunctionDecl::StorageClass SC = SC_None; 3563 switch (D.getDeclSpec().getStorageClassSpec()) { 3564 default: assert(0 && "Unknown storage class!"); 3565 case DeclSpec::SCS_auto: 3566 case DeclSpec::SCS_register: 3567 case DeclSpec::SCS_mutable: 3568 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3569 diag::err_typecheck_sclass_func); 3570 D.setInvalidType(); 3571 break; 3572 case DeclSpec::SCS_unspecified: SC = SC_None; break; 3573 case DeclSpec::SCS_extern: SC = SC_Extern; break; 3574 case DeclSpec::SCS_static: { 3575 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 3576 // C99 6.7.1p5: 3577 // The declaration of an identifier for a function that has 3578 // block scope shall have no explicit storage-class specifier 3579 // other than extern 3580 // See also (C++ [dcl.stc]p4). 3581 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3582 diag::err_static_block_func); 3583 SC = SC_None; 3584 } else 3585 SC = SC_Static; 3586 break; 3587 } 3588 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 3589 } 3590 3591 if (D.getDeclSpec().isThreadSpecified()) 3592 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3593 3594 // Do not allow returning a objc interface by-value. 3595 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 3596 Diag(D.getIdentifierLoc(), 3597 diag::err_object_cannot_be_passed_returned_by_value) << 0 3598 << R->getAs<FunctionType>()->getResultType(); 3599 D.setInvalidType(); 3600 } 3601 3602 FunctionDecl *NewFD; 3603 bool isInline = D.getDeclSpec().isInlineSpecified(); 3604 bool isFriend = false; 3605 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3606 FunctionDecl::StorageClass SCAsWritten 3607 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 3608 FunctionTemplateDecl *FunctionTemplate = 0; 3609 bool isExplicitSpecialization = false; 3610 bool isFunctionTemplateSpecialization = false; 3611 unsigned NumMatchedTemplateParamLists = 0; 3612 3613 if (!getLangOptions().CPlusPlus) { 3614 // Determine whether the function was written with a 3615 // prototype. This true when: 3616 // - there is a prototype in the declarator, or 3617 // - the type R of the function is some kind of typedef or other reference 3618 // to a type name (which eventually refers to a function type). 3619 bool HasPrototype = 3620 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 3621 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 3622 3623 NewFD = FunctionDecl::Create(Context, DC, 3624 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 3625 HasPrototype); 3626 if (D.isInvalidType()) 3627 NewFD->setInvalidDecl(); 3628 3629 // Set the lexical context. 3630 NewFD->setLexicalDeclContext(CurContext); 3631 // Filter out previous declarations that don't match the scope. 3632 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage(), 3633 /*ExplicitInstantiationOrSpecialization=*/false); 3634 } else { 3635 isFriend = D.getDeclSpec().isFriendSpecified(); 3636 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3637 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 3638 bool isVirtualOkay = false; 3639 3640 // Check that the return type is not an abstract class type. 3641 // For record types, this is done by the AbstractClassUsageDiagnoser once 3642 // the class has been completely parsed. 3643 if (!DC->isRecord() && 3644 RequireNonAbstractType(D.getIdentifierLoc(), 3645 R->getAs<FunctionType>()->getResultType(), 3646 diag::err_abstract_type_in_decl, 3647 AbstractReturnType)) 3648 D.setInvalidType(); 3649 3650 3651 if (isFriend) { 3652 // C++ [class.friend]p5 3653 // A function can be defined in a friend declaration of a 3654 // class . . . . Such a function is implicitly inline. 3655 isInline |= IsFunctionDefinition; 3656 } 3657 3658 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 3659 // This is a C++ constructor declaration. 3660 assert(DC->isRecord() && 3661 "Constructors can only be declared in a member context"); 3662 3663 R = CheckConstructorDeclarator(D, R, SC); 3664 3665 // Create the new declaration 3666 NewFD = CXXConstructorDecl::Create(Context, 3667 cast<CXXRecordDecl>(DC), 3668 NameInfo, R, TInfo, 3669 isExplicit, isInline, 3670 /*isImplicitlyDeclared=*/false); 3671 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3672 // This is a C++ destructor declaration. 3673 if (DC->isRecord()) { 3674 R = CheckDestructorDeclarator(D, R, SC); 3675 3676 NewFD = CXXDestructorDecl::Create(Context, 3677 cast<CXXRecordDecl>(DC), 3678 NameInfo, R, TInfo, 3679 isInline, 3680 /*isImplicitlyDeclared=*/false); 3681 isVirtualOkay = true; 3682 } else { 3683 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 3684 3685 // Create a FunctionDecl to satisfy the function definition parsing 3686 // code path. 3687 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 3688 Name, R, TInfo, SC, SCAsWritten, isInline, 3689 /*hasPrototype=*/true); 3690 D.setInvalidType(); 3691 } 3692 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 3693 if (!DC->isRecord()) { 3694 Diag(D.getIdentifierLoc(), 3695 diag::err_conv_function_not_member); 3696 return 0; 3697 } 3698 3699 CheckConversionDeclarator(D, R, SC); 3700 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 3701 NameInfo, R, TInfo, 3702 isInline, isExplicit); 3703 3704 isVirtualOkay = true; 3705 } else if (DC->isRecord()) { 3706 // If the of the function is the same as the name of the record, then this 3707 // must be an invalid constructor that has a return type. 3708 // (The parser checks for a return type and makes the declarator a 3709 // constructor if it has no return type). 3710 // must have an invalid constructor that has a return type 3711 if (Name.getAsIdentifierInfo() && 3712 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 3713 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 3714 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3715 << SourceRange(D.getIdentifierLoc()); 3716 return 0; 3717 } 3718 3719 bool isStatic = SC == SC_Static; 3720 3721 // [class.free]p1: 3722 // Any allocation function for a class T is a static member 3723 // (even if not explicitly declared static). 3724 if (Name.getCXXOverloadedOperator() == OO_New || 3725 Name.getCXXOverloadedOperator() == OO_Array_New) 3726 isStatic = true; 3727 3728 // [class.free]p6 Any deallocation function for a class X is a static member 3729 // (even if not explicitly declared static). 3730 if (Name.getCXXOverloadedOperator() == OO_Delete || 3731 Name.getCXXOverloadedOperator() == OO_Array_Delete) 3732 isStatic = true; 3733 3734 // This is a C++ method declaration. 3735 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 3736 NameInfo, R, TInfo, 3737 isStatic, SCAsWritten, isInline); 3738 3739 isVirtualOkay = !isStatic; 3740 } else { 3741 // Determine whether the function was written with a 3742 // prototype. This true when: 3743 // - we're in C++ (where every function has a prototype), 3744 NewFD = FunctionDecl::Create(Context, DC, 3745 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 3746 true/*HasPrototype*/); 3747 } 3748 SetNestedNameSpecifier(NewFD, D); 3749 isExplicitSpecialization = false; 3750 isFunctionTemplateSpecialization = false; 3751 NumMatchedTemplateParamLists = TemplateParamLists.size(); 3752 if (D.isInvalidType()) 3753 NewFD->setInvalidDecl(); 3754 3755 // Set the lexical context. If the declarator has a C++ 3756 // scope specifier, or is the object of a friend declaration, the 3757 // lexical context will be different from the semantic context. 3758 NewFD->setLexicalDeclContext(CurContext); 3759 3760 // Match up the template parameter lists with the scope specifier, then 3761 // determine whether we have a template or a template specialization. 3762 bool Invalid = false; 3763 if (TemplateParameterList *TemplateParams 3764 = MatchTemplateParametersToScopeSpecifier( 3765 D.getDeclSpec().getSourceRange().getBegin(), 3766 D.getCXXScopeSpec(), 3767 TemplateParamLists.get(), 3768 TemplateParamLists.size(), 3769 isFriend, 3770 isExplicitSpecialization, 3771 Invalid)) { 3772 // All but one template parameter lists have been matching. 3773 --NumMatchedTemplateParamLists; 3774 3775 if (TemplateParams->size() > 0) { 3776 // This is a function template 3777 3778 // Check that we can declare a template here. 3779 if (CheckTemplateDeclScope(S, TemplateParams)) 3780 return 0; 3781 3782 // A destructor cannot be a template. 3783 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3784 Diag(NewFD->getLocation(), diag::err_destructor_template); 3785 return 0; 3786 } 3787 3788 3789 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 3790 NewFD->getLocation(), 3791 Name, TemplateParams, 3792 NewFD); 3793 FunctionTemplate->setLexicalDeclContext(CurContext); 3794 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 3795 } else { 3796 // This is a function template specialization. 3797 isFunctionTemplateSpecialization = true; 3798 3799 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 3800 if (isFriend && isFunctionTemplateSpecialization) { 3801 // We want to remove the "template<>", found here. 3802 SourceRange RemoveRange = TemplateParams->getSourceRange(); 3803 3804 // If we remove the template<> and the name is not a 3805 // template-id, we're actually silently creating a problem: 3806 // the friend declaration will refer to an untemplated decl, 3807 // and clearly the user wants a template specialization. So 3808 // we need to insert '<>' after the name. 3809 SourceLocation InsertLoc; 3810 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 3811 InsertLoc = D.getName().getSourceRange().getEnd(); 3812 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 3813 } 3814 3815 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 3816 << Name << RemoveRange 3817 << FixItHint::CreateRemoval(RemoveRange) 3818 << FixItHint::CreateInsertion(InsertLoc, "<>"); 3819 } 3820 } 3821 } 3822 3823 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 3824 NewFD->setTemplateParameterListsInfo(Context, 3825 NumMatchedTemplateParamLists, 3826 TemplateParamLists.release()); 3827 } 3828 3829 if (Invalid) { 3830 NewFD->setInvalidDecl(); 3831 if (FunctionTemplate) 3832 FunctionTemplate->setInvalidDecl(); 3833 } 3834 3835 // C++ [dcl.fct.spec]p5: 3836 // The virtual specifier shall only be used in declarations of 3837 // nonstatic class member functions that appear within a 3838 // member-specification of a class declaration; see 10.3. 3839 // 3840 if (isVirtual && !NewFD->isInvalidDecl()) { 3841 if (!isVirtualOkay) { 3842 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3843 diag::err_virtual_non_function); 3844 } else if (!CurContext->isRecord()) { 3845 // 'virtual' was specified outside of the class. 3846 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3847 diag::err_virtual_out_of_class) 3848 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 3849 } else if (NewFD->getDescribedFunctionTemplate()) { 3850 // C++ [temp.mem]p3: 3851 // A member function template shall not be virtual. 3852 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3853 diag::err_virtual_member_function_template) 3854 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 3855 } else { 3856 // Okay: Add virtual to the method. 3857 NewFD->setVirtualAsWritten(true); 3858 } 3859 } 3860 3861 // C++ [dcl.fct.spec]p3: 3862 // The inline specifier shall not appear on a block scope function declaration. 3863 if (isInline && !NewFD->isInvalidDecl()) { 3864 if (CurContext->isFunctionOrMethod()) { 3865 // 'inline' is not allowed on block scope function declaration. 3866 Diag(D.getDeclSpec().getInlineSpecLoc(), 3867 diag::err_inline_declaration_block_scope) << Name 3868 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 3869 } 3870 } 3871 3872 // C++ [dcl.fct.spec]p6: 3873 // The explicit specifier shall be used only in the declaration of a 3874 // constructor or conversion function within its class definition; see 12.3.1 3875 // and 12.3.2. 3876 if (isExplicit && !NewFD->isInvalidDecl()) { 3877 if (!CurContext->isRecord()) { 3878 // 'explicit' was specified outside of the class. 3879 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3880 diag::err_explicit_out_of_class) 3881 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3882 } else if (!isa<CXXConstructorDecl>(NewFD) && 3883 !isa<CXXConversionDecl>(NewFD)) { 3884 // 'explicit' was specified on a function that wasn't a constructor 3885 // or conversion function. 3886 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3887 diag::err_explicit_non_ctor_or_conv_function) 3888 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3889 } 3890 } 3891 3892 // Filter out previous declarations that don't match the scope. 3893 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage(), 3894 isExplicitSpecialization || 3895 isFunctionTemplateSpecialization); 3896 3897 if (isFriend) { 3898 // For now, claim that the objects have no previous declaration. 3899 if (FunctionTemplate) { 3900 FunctionTemplate->setObjectOfFriendDecl(false); 3901 FunctionTemplate->setAccess(AS_public); 3902 } 3903 NewFD->setObjectOfFriendDecl(false); 3904 NewFD->setAccess(AS_public); 3905 } 3906 3907 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 3908 // A method is implicitly inline if it's defined in its class 3909 // definition. 3910 NewFD->setImplicitlyInline(); 3911 } 3912 3913 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 3914 !CurContext->isRecord()) { 3915 // C++ [class.static]p1: 3916 // A data or function member of a class may be declared static 3917 // in a class definition, in which case it is a static member of 3918 // the class. 3919 3920 // Complain about the 'static' specifier if it's on an out-of-line 3921 // member function definition. 3922 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3923 diag::err_static_out_of_line) 3924 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3925 } 3926 } 3927 3928 // Handle GNU asm-label extension (encoded as an attribute). 3929 if (Expr *E = (Expr*) D.getAsmLabel()) { 3930 // The parser guarantees this is a string. 3931 StringLiteral *SE = cast<StringLiteral>(E); 3932 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 3933 SE->getString())); 3934 } 3935 3936 // Copy the parameter declarations from the declarator D to the function 3937 // declaration NewFD, if they are available. First scavenge them into Params. 3938 llvm::SmallVector<ParmVarDecl*, 16> Params; 3939 if (D.isFunctionDeclarator()) { 3940 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 3941 3942 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 3943 // function that takes no arguments, not a function that takes a 3944 // single void argument. 3945 // We let through "const void" here because Sema::GetTypeForDeclarator 3946 // already checks for that case. 3947 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3948 FTI.ArgInfo[0].Param && 3949 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 3950 // Empty arg list, don't push any params. 3951 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 3952 3953 // In C++, the empty parameter-type-list must be spelled "void"; a 3954 // typedef of void is not permitted. 3955 if (getLangOptions().CPlusPlus && 3956 Param->getType().getUnqualifiedType() != Context.VoidTy) 3957 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 3958 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 3959 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 3960 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3961 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 3962 Param->setDeclContext(NewFD); 3963 Params.push_back(Param); 3964 3965 if (Param->isInvalidDecl()) 3966 NewFD->setInvalidDecl(); 3967 } 3968 } 3969 3970 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 3971 // When we're declaring a function with a typedef, typeof, etc as in the 3972 // following example, we'll need to synthesize (unnamed) 3973 // parameters for use in the declaration. 3974 // 3975 // @code 3976 // typedef void fn(int); 3977 // fn f; 3978 // @endcode 3979 3980 // Synthesize a parameter for each argument type. 3981 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3982 AE = FT->arg_type_end(); AI != AE; ++AI) { 3983 ParmVarDecl *Param = 3984 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 3985 Params.push_back(Param); 3986 } 3987 } else { 3988 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 3989 "Should not need args for typedef of non-prototype fn"); 3990 } 3991 // Finally, we know we have the right number of parameters, install them. 3992 NewFD->setParams(Params.data(), Params.size()); 3993 3994 // Process the non-inheritable attributes on this declaration. 3995 ProcessDeclAttributes(S, NewFD, D, 3996 /*NonInheritable=*/true, /*Inheritable=*/false); 3997 3998 if (!getLangOptions().CPlusPlus) { 3999 // Perform semantic checking on the function declaration. 4000 bool isExplctSpecialization=false; 4001 CheckFunctionDeclaration(S, NewFD, Previous, isExplctSpecialization, 4002 Redeclaration); 4003 assert((NewFD->isInvalidDecl() || !Redeclaration || 4004 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4005 "previous declaration set still overloaded"); 4006 } else { 4007 // If the declarator is a template-id, translate the parser's template 4008 // argument list into our AST format. 4009 bool HasExplicitTemplateArgs = false; 4010 TemplateArgumentListInfo TemplateArgs; 4011 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 4012 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 4013 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 4014 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 4015 ASTTemplateArgsPtr TemplateArgsPtr(*this, 4016 TemplateId->getTemplateArgs(), 4017 TemplateId->NumArgs); 4018 translateTemplateArguments(TemplateArgsPtr, 4019 TemplateArgs); 4020 TemplateArgsPtr.release(); 4021 4022 HasExplicitTemplateArgs = true; 4023 4024 if (FunctionTemplate) { 4025 // Function template with explicit template arguments. 4026 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 4027 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 4028 4029 HasExplicitTemplateArgs = false; 4030 } else if (!isFunctionTemplateSpecialization && 4031 !D.getDeclSpec().isFriendSpecified()) { 4032 // We have encountered something that the user meant to be a 4033 // specialization (because it has explicitly-specified template 4034 // arguments) but that was not introduced with a "template<>" (or had 4035 // too few of them). 4036 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 4037 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 4038 << FixItHint::CreateInsertion( 4039 D.getDeclSpec().getSourceRange().getBegin(), 4040 "template<> "); 4041 isFunctionTemplateSpecialization = true; 4042 } else { 4043 // "friend void foo<>(int);" is an implicit specialization decl. 4044 isFunctionTemplateSpecialization = true; 4045 } 4046 } else if (isFriend && isFunctionTemplateSpecialization) { 4047 // This combination is only possible in a recovery case; the user 4048 // wrote something like: 4049 // template <> friend void foo(int); 4050 // which we're recovering from as if the user had written: 4051 // friend void foo<>(int); 4052 // Go ahead and fake up a template id. 4053 HasExplicitTemplateArgs = true; 4054 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 4055 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 4056 } 4057 4058 // If it's a friend (and only if it's a friend), it's possible 4059 // that either the specialized function type or the specialized 4060 // template is dependent, and therefore matching will fail. In 4061 // this case, don't check the specialization yet. 4062 if (isFunctionTemplateSpecialization && isFriend && 4063 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 4064 assert(HasExplicitTemplateArgs && 4065 "friend function specialization without template args"); 4066 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 4067 Previous)) 4068 NewFD->setInvalidDecl(); 4069 } else if (isFunctionTemplateSpecialization) { 4070 if (CheckFunctionTemplateSpecialization(NewFD, 4071 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 4072 Previous)) 4073 NewFD->setInvalidDecl(); 4074 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 4075 if (CheckMemberSpecialization(NewFD, Previous)) 4076 NewFD->setInvalidDecl(); 4077 } 4078 4079 // Perform semantic checking on the function declaration. 4080 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4081 Redeclaration); 4082 4083 assert((NewFD->isInvalidDecl() || !Redeclaration || 4084 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4085 "previous declaration set still overloaded"); 4086 4087 NamedDecl *PrincipalDecl = (FunctionTemplate 4088 ? cast<NamedDecl>(FunctionTemplate) 4089 : NewFD); 4090 4091 if (isFriend && Redeclaration) { 4092 AccessSpecifier Access = AS_public; 4093 if (!NewFD->isInvalidDecl()) 4094 Access = NewFD->getPreviousDeclaration()->getAccess(); 4095 4096 NewFD->setAccess(Access); 4097 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 4098 4099 PrincipalDecl->setObjectOfFriendDecl(true); 4100 } 4101 4102 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 4103 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 4104 PrincipalDecl->setNonMemberOperator(); 4105 4106 // If we have a function template, check the template parameter 4107 // list. This will check and merge default template arguments. 4108 if (FunctionTemplate) { 4109 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 4110 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 4111 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 4112 D.getDeclSpec().isFriendSpecified() 4113 ? (IsFunctionDefinition 4114 ? TPC_FriendFunctionTemplateDefinition 4115 : TPC_FriendFunctionTemplate) 4116 : (D.getCXXScopeSpec().isSet() && 4117 DC && DC->isRecord() && 4118 DC->isDependentContext()) 4119 ? TPC_ClassTemplateMember 4120 : TPC_FunctionTemplate); 4121 } 4122 4123 if (NewFD->isInvalidDecl()) { 4124 // Ignore all the rest of this. 4125 } else if (!Redeclaration) { 4126 // Fake up an access specifier if it's supposed to be a class member. 4127 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 4128 NewFD->setAccess(AS_public); 4129 4130 // Qualified decls generally require a previous declaration. 4131 if (D.getCXXScopeSpec().isSet()) { 4132 // ...with the major exception of templated-scope or 4133 // dependent-scope friend declarations. 4134 4135 // TODO: we currently also suppress this check in dependent 4136 // contexts because (1) the parameter depth will be off when 4137 // matching friend templates and (2) we might actually be 4138 // selecting a friend based on a dependent factor. But there 4139 // are situations where these conditions don't apply and we 4140 // can actually do this check immediately. 4141 if (isFriend && 4142 (NumMatchedTemplateParamLists || 4143 D.getCXXScopeSpec().getScopeRep()->isDependent() || 4144 CurContext->isDependentContext())) { 4145 // ignore these 4146 } else { 4147 // The user tried to provide an out-of-line definition for a 4148 // function that is a member of a class or namespace, but there 4149 // was no such member function declared (C++ [class.mfct]p2, 4150 // C++ [namespace.memdef]p2). For example: 4151 // 4152 // class X { 4153 // void f() const; 4154 // }; 4155 // 4156 // void X::f() { } // ill-formed 4157 // 4158 // Complain about this problem, and attempt to suggest close 4159 // matches (e.g., those that differ only in cv-qualifiers and 4160 // whether the parameter types are references). 4161 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 4162 << Name << DC << D.getCXXScopeSpec().getRange(); 4163 NewFD->setInvalidDecl(); 4164 4165 DiagnoseInvalidRedeclaration(*this, NewFD); 4166 } 4167 4168 // Unqualified local friend declarations are required to resolve 4169 // to something. 4170 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 4171 Diag(D.getIdentifierLoc(), diag::err_no_matching_local_friend); 4172 NewFD->setInvalidDecl(); 4173 DiagnoseInvalidRedeclaration(*this, NewFD); 4174 } 4175 4176 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 4177 !isFriend && !isFunctionTemplateSpecialization && 4178 !isExplicitSpecialization) { 4179 // An out-of-line member function declaration must also be a 4180 // definition (C++ [dcl.meaning]p1). 4181 // Note that this is not the case for explicit specializations of 4182 // function templates or member functions of class templates, per 4183 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 4184 // for compatibility with old SWIG code which likes to generate them. 4185 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 4186 << D.getCXXScopeSpec().getRange(); 4187 } 4188 } 4189 4190 4191 // Handle attributes. We need to have merged decls when handling attributes 4192 // (for example to check for conflicts, etc). 4193 // FIXME: This needs to happen before we merge declarations. Then, 4194 // let attribute merging cope with attribute conflicts. 4195 ProcessDeclAttributes(S, NewFD, D, 4196 /*NonInheritable=*/false, /*Inheritable=*/true); 4197 4198 // attributes declared post-definition are currently ignored 4199 // FIXME: This should happen during attribute merging 4200 if (Redeclaration && Previous.isSingleResult()) { 4201 const FunctionDecl *Def; 4202 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 4203 if (PrevFD && PrevFD->hasBody(Def) && D.hasAttributes()) { 4204 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 4205 Diag(Def->getLocation(), diag::note_previous_definition); 4206 } 4207 } 4208 4209 AddKnownFunctionAttributes(NewFD); 4210 4211 if (NewFD->hasAttr<OverloadableAttr>() && 4212 !NewFD->getType()->getAs<FunctionProtoType>()) { 4213 Diag(NewFD->getLocation(), 4214 diag::err_attribute_overloadable_no_prototype) 4215 << NewFD; 4216 4217 // Turn this into a variadic function with no parameters. 4218 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 4219 FunctionProtoType::ExtProtoInfo EPI; 4220 EPI.Variadic = true; 4221 EPI.ExtInfo = FT->getExtInfo(); 4222 4223 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 4224 NewFD->setType(R); 4225 } 4226 4227 // If there's a #pragma GCC visibility in scope, and this isn't a class 4228 // member, set the visibility of this function. 4229 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4230 AddPushedVisibilityAttribute(NewFD); 4231 4232 // If this is a locally-scoped extern C function, update the 4233 // map of such names. 4234 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 4235 && !NewFD->isInvalidDecl()) 4236 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 4237 4238 // Set this FunctionDecl's range up to the right paren. 4239 NewFD->setLocEnd(D.getSourceRange().getEnd()); 4240 4241 if (getLangOptions().CPlusPlus) { 4242 if (FunctionTemplate) { 4243 if (NewFD->isInvalidDecl()) 4244 FunctionTemplate->setInvalidDecl(); 4245 return FunctionTemplate; 4246 } 4247 } 4248 4249 MarkUnusedFileScopedDecl(NewFD); 4250 4251 if (getLangOptions().CUDA) 4252 if (IdentifierInfo *II = NewFD->getIdentifier()) 4253 if (!NewFD->isInvalidDecl() && 4254 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 4255 if (II->isStr("cudaConfigureCall")) { 4256 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 4257 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 4258 4259 Context.setcudaConfigureCallDecl(NewFD); 4260 } 4261 } 4262 4263 return NewFD; 4264} 4265 4266/// \brief Perform semantic checking of a new function declaration. 4267/// 4268/// Performs semantic analysis of the new function declaration 4269/// NewFD. This routine performs all semantic checking that does not 4270/// require the actual declarator involved in the declaration, and is 4271/// used both for the declaration of functions as they are parsed 4272/// (called via ActOnDeclarator) and for the declaration of functions 4273/// that have been instantiated via C++ template instantiation (called 4274/// via InstantiateDecl). 4275/// 4276/// \param IsExplicitSpecialiation whether this new function declaration is 4277/// an explicit specialization of the previous declaration. 4278/// 4279/// This sets NewFD->isInvalidDecl() to true if there was an error. 4280void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 4281 LookupResult &Previous, 4282 bool IsExplicitSpecialization, 4283 bool &Redeclaration) { 4284 // If NewFD is already known erroneous, don't do any of this checking. 4285 if (NewFD->isInvalidDecl()) { 4286 // If this is a class member, mark the class invalid immediately. 4287 // This avoids some consistency errors later. 4288 if (isa<CXXMethodDecl>(NewFD)) 4289 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl(); 4290 4291 return; 4292 } 4293 4294 if (NewFD->getResultType()->isVariablyModifiedType()) { 4295 // Functions returning a variably modified type violate C99 6.7.5.2p2 4296 // because all functions have linkage. 4297 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 4298 return NewFD->setInvalidDecl(); 4299 } 4300 4301 if (NewFD->isMain()) 4302 CheckMain(NewFD); 4303 4304 // Check for a previous declaration of this name. 4305 if (Previous.empty() && NewFD->isExternC()) { 4306 // Since we did not find anything by this name and we're declaring 4307 // an extern "C" function, look for a non-visible extern "C" 4308 // declaration with the same name. 4309 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4310 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 4311 if (Pos != LocallyScopedExternalDecls.end()) 4312 Previous.addDecl(Pos->second); 4313 } 4314 4315 // Merge or overload the declaration with an existing declaration of 4316 // the same name, if appropriate. 4317 if (!Previous.empty()) { 4318 // Determine whether NewFD is an overload of PrevDecl or 4319 // a declaration that requires merging. If it's an overload, 4320 // there's no more work to do here; we'll just add the new 4321 // function to the scope. 4322 4323 NamedDecl *OldDecl = 0; 4324 if (!AllowOverloadingOfFunction(Previous, Context)) { 4325 Redeclaration = true; 4326 OldDecl = Previous.getFoundDecl(); 4327 } else { 4328 switch (CheckOverload(S, NewFD, Previous, OldDecl, 4329 /*NewIsUsingDecl*/ false)) { 4330 case Ovl_Match: 4331 Redeclaration = true; 4332 break; 4333 4334 case Ovl_NonFunction: 4335 Redeclaration = true; 4336 break; 4337 4338 case Ovl_Overload: 4339 Redeclaration = false; 4340 break; 4341 } 4342 4343 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 4344 // If a function name is overloadable in C, then every function 4345 // with that name must be marked "overloadable". 4346 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 4347 << Redeclaration << NewFD; 4348 NamedDecl *OverloadedDecl = 0; 4349 if (Redeclaration) 4350 OverloadedDecl = OldDecl; 4351 else if (!Previous.empty()) 4352 OverloadedDecl = Previous.getRepresentativeDecl(); 4353 if (OverloadedDecl) 4354 Diag(OverloadedDecl->getLocation(), 4355 diag::note_attribute_overloadable_prev_overload); 4356 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 4357 Context)); 4358 } 4359 } 4360 4361 if (Redeclaration) { 4362 // NewFD and OldDecl represent declarations that need to be 4363 // merged. 4364 if (MergeFunctionDecl(NewFD, OldDecl)) 4365 return NewFD->setInvalidDecl(); 4366 4367 Previous.clear(); 4368 Previous.addDecl(OldDecl); 4369 4370 if (FunctionTemplateDecl *OldTemplateDecl 4371 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 4372 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 4373 FunctionTemplateDecl *NewTemplateDecl 4374 = NewFD->getDescribedFunctionTemplate(); 4375 assert(NewTemplateDecl && "Template/non-template mismatch"); 4376 if (CXXMethodDecl *Method 4377 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 4378 Method->setAccess(OldTemplateDecl->getAccess()); 4379 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 4380 } 4381 4382 // If this is an explicit specialization of a member that is a function 4383 // template, mark it as a member specialization. 4384 if (IsExplicitSpecialization && 4385 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 4386 NewTemplateDecl->setMemberSpecialization(); 4387 assert(OldTemplateDecl->isMemberSpecialization()); 4388 } 4389 } else { 4390 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 4391 NewFD->setAccess(OldDecl->getAccess()); 4392 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 4393 } 4394 } 4395 } 4396 4397 // Semantic checking for this function declaration (in isolation). 4398 if (getLangOptions().CPlusPlus) { 4399 // C++-specific checks. 4400 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 4401 CheckConstructor(Constructor); 4402 } else if (CXXDestructorDecl *Destructor = 4403 dyn_cast<CXXDestructorDecl>(NewFD)) { 4404 CXXRecordDecl *Record = Destructor->getParent(); 4405 QualType ClassType = Context.getTypeDeclType(Record); 4406 4407 // FIXME: Shouldn't we be able to perform this check even when the class 4408 // type is dependent? Both gcc and edg can handle that. 4409 if (!ClassType->isDependentType()) { 4410 DeclarationName Name 4411 = Context.DeclarationNames.getCXXDestructorName( 4412 Context.getCanonicalType(ClassType)); 4413 if (NewFD->getDeclName() != Name) { 4414 Diag(NewFD->getLocation(), diag::err_destructor_name); 4415 return NewFD->setInvalidDecl(); 4416 } 4417 } 4418 } else if (CXXConversionDecl *Conversion 4419 = dyn_cast<CXXConversionDecl>(NewFD)) { 4420 ActOnConversionDeclarator(Conversion); 4421 } 4422 4423 // Find any virtual functions that this function overrides. 4424 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 4425 if (!Method->isFunctionTemplateSpecialization() && 4426 !Method->getDescribedFunctionTemplate()) { 4427 if (AddOverriddenMethods(Method->getParent(), Method)) { 4428 // If the function was marked as "static", we have a problem. 4429 if (NewFD->getStorageClass() == SC_Static) { 4430 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 4431 << NewFD->getDeclName(); 4432 for (CXXMethodDecl::method_iterator 4433 Overridden = Method->begin_overridden_methods(), 4434 OverriddenEnd = Method->end_overridden_methods(); 4435 Overridden != OverriddenEnd; 4436 ++Overridden) { 4437 Diag((*Overridden)->getLocation(), 4438 diag::note_overridden_virtual_function); 4439 } 4440 } 4441 } 4442 } 4443 } 4444 4445 // Extra checking for C++ overloaded operators (C++ [over.oper]). 4446 if (NewFD->isOverloadedOperator() && 4447 CheckOverloadedOperatorDeclaration(NewFD)) 4448 return NewFD->setInvalidDecl(); 4449 4450 // Extra checking for C++0x literal operators (C++0x [over.literal]). 4451 if (NewFD->getLiteralIdentifier() && 4452 CheckLiteralOperatorDeclaration(NewFD)) 4453 return NewFD->setInvalidDecl(); 4454 4455 // In C++, check default arguments now that we have merged decls. Unless 4456 // the lexical context is the class, because in this case this is done 4457 // during delayed parsing anyway. 4458 if (!CurContext->isRecord()) 4459 CheckCXXDefaultArguments(NewFD); 4460 4461 // If this function declares a builtin function, check the type of this 4462 // declaration against the expected type for the builtin. 4463 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 4464 ASTContext::GetBuiltinTypeError Error; 4465 QualType T = Context.GetBuiltinType(BuiltinID, Error); 4466 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 4467 // The type of this function differs from the type of the builtin, 4468 // so forget about the builtin entirely. 4469 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 4470 } 4471 } 4472 } 4473} 4474 4475void Sema::CheckMain(FunctionDecl* FD) { 4476 // C++ [basic.start.main]p3: A program that declares main to be inline 4477 // or static is ill-formed. 4478 // C99 6.7.4p4: In a hosted environment, the inline function specifier 4479 // shall not appear in a declaration of main. 4480 // static main is not an error under C99, but we should warn about it. 4481 bool isInline = FD->isInlineSpecified(); 4482 bool isStatic = FD->getStorageClass() == SC_Static; 4483 if (isInline || isStatic) { 4484 unsigned diagID = diag::warn_unusual_main_decl; 4485 if (isInline || getLangOptions().CPlusPlus) 4486 diagID = diag::err_unusual_main_decl; 4487 4488 int which = isStatic + (isInline << 1) - 1; 4489 Diag(FD->getLocation(), diagID) << which; 4490 } 4491 4492 QualType T = FD->getType(); 4493 assert(T->isFunctionType() && "function decl is not of function type"); 4494 const FunctionType* FT = T->getAs<FunctionType>(); 4495 4496 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 4497 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 4498 FD->setInvalidDecl(true); 4499 } 4500 4501 // Treat protoless main() as nullary. 4502 if (isa<FunctionNoProtoType>(FT)) return; 4503 4504 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 4505 unsigned nparams = FTP->getNumArgs(); 4506 assert(FD->getNumParams() == nparams); 4507 4508 bool HasExtraParameters = (nparams > 3); 4509 4510 // Darwin passes an undocumented fourth argument of type char**. If 4511 // other platforms start sprouting these, the logic below will start 4512 // getting shifty. 4513 if (nparams == 4 && 4514 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 4515 HasExtraParameters = false; 4516 4517 if (HasExtraParameters) { 4518 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 4519 FD->setInvalidDecl(true); 4520 nparams = 3; 4521 } 4522 4523 // FIXME: a lot of the following diagnostics would be improved 4524 // if we had some location information about types. 4525 4526 QualType CharPP = 4527 Context.getPointerType(Context.getPointerType(Context.CharTy)); 4528 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 4529 4530 for (unsigned i = 0; i < nparams; ++i) { 4531 QualType AT = FTP->getArgType(i); 4532 4533 bool mismatch = true; 4534 4535 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 4536 mismatch = false; 4537 else if (Expected[i] == CharPP) { 4538 // As an extension, the following forms are okay: 4539 // char const ** 4540 // char const * const * 4541 // char * const * 4542 4543 QualifierCollector qs; 4544 const PointerType* PT; 4545 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 4546 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 4547 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 4548 qs.removeConst(); 4549 mismatch = !qs.empty(); 4550 } 4551 } 4552 4553 if (mismatch) { 4554 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 4555 // TODO: suggest replacing given type with expected type 4556 FD->setInvalidDecl(true); 4557 } 4558 } 4559 4560 if (nparams == 1 && !FD->isInvalidDecl()) { 4561 Diag(FD->getLocation(), diag::warn_main_one_arg); 4562 } 4563 4564 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 4565 Diag(FD->getLocation(), diag::err_main_template_decl); 4566 FD->setInvalidDecl(); 4567 } 4568} 4569 4570bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 4571 // FIXME: Need strict checking. In C89, we need to check for 4572 // any assignment, increment, decrement, function-calls, or 4573 // commas outside of a sizeof. In C99, it's the same list, 4574 // except that the aforementioned are allowed in unevaluated 4575 // expressions. Everything else falls under the 4576 // "may accept other forms of constant expressions" exception. 4577 // (We never end up here for C++, so the constant expression 4578 // rules there don't matter.) 4579 if (Init->isConstantInitializer(Context, false)) 4580 return false; 4581 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 4582 << Init->getSourceRange(); 4583 return true; 4584} 4585 4586/// AddInitializerToDecl - Adds the initializer Init to the 4587/// declaration dcl. If DirectInit is true, this is C++ direct 4588/// initialization rather than copy initialization. 4589void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 4590 bool DirectInit, bool TypeMayContainAuto) { 4591 // If there is no declaration, there was an error parsing it. Just ignore 4592 // the initializer. 4593 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 4594 return; 4595 4596 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 4597 // With declarators parsed the way they are, the parser cannot 4598 // distinguish between a normal initializer and a pure-specifier. 4599 // Thus this grotesque test. 4600 IntegerLiteral *IL; 4601 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 4602 Context.getCanonicalType(IL->getType()) == Context.IntTy) 4603 CheckPureMethod(Method, Init->getSourceRange()); 4604 else { 4605 Diag(Method->getLocation(), diag::err_member_function_initialization) 4606 << Method->getDeclName() << Init->getSourceRange(); 4607 Method->setInvalidDecl(); 4608 } 4609 return; 4610 } 4611 4612 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4613 if (!VDecl) { 4614 if (getLangOptions().CPlusPlus && 4615 RealDecl->getLexicalDeclContext()->isRecord() && 4616 isa<NamedDecl>(RealDecl)) 4617 Diag(RealDecl->getLocation(), diag::err_member_initialization); 4618 else 4619 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4620 RealDecl->setInvalidDecl(); 4621 return; 4622 } 4623 4624 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 4625 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 4626 QualType DeducedType; 4627 if (!DeduceAutoType(VDecl->getType(), Init, DeducedType)) { 4628 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 4629 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 4630 << Init->getSourceRange(); 4631 RealDecl->setInvalidDecl(); 4632 return; 4633 } 4634 VDecl->setType(DeducedType); 4635 4636 // If this is a redeclaration, check that the type we just deduced matches 4637 // the previously declared type. 4638 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 4639 MergeVarDeclTypes(VDecl, Old); 4640 } 4641 4642 4643 // A definition must end up with a complete type, which means it must be 4644 // complete with the restriction that an array type might be completed by the 4645 // initializer; note that later code assumes this restriction. 4646 QualType BaseDeclType = VDecl->getType(); 4647 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 4648 BaseDeclType = Array->getElementType(); 4649 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 4650 diag::err_typecheck_decl_incomplete_type)) { 4651 RealDecl->setInvalidDecl(); 4652 return; 4653 } 4654 4655 // The variable can not have an abstract class type. 4656 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4657 diag::err_abstract_type_in_decl, 4658 AbstractVariableType)) 4659 VDecl->setInvalidDecl(); 4660 4661 const VarDecl *Def; 4662 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4663 Diag(VDecl->getLocation(), diag::err_redefinition) 4664 << VDecl->getDeclName(); 4665 Diag(Def->getLocation(), diag::note_previous_definition); 4666 VDecl->setInvalidDecl(); 4667 return; 4668 } 4669 4670 const VarDecl* PrevInit = 0; 4671 if (getLangOptions().CPlusPlus) { 4672 // C++ [class.static.data]p4 4673 // If a static data member is of const integral or const 4674 // enumeration type, its declaration in the class definition can 4675 // specify a constant-initializer which shall be an integral 4676 // constant expression (5.19). In that case, the member can appear 4677 // in integral constant expressions. The member shall still be 4678 // defined in a namespace scope if it is used in the program and the 4679 // namespace scope definition shall not contain an initializer. 4680 // 4681 // We already performed a redefinition check above, but for static 4682 // data members we also need to check whether there was an in-class 4683 // declaration with an initializer. 4684 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 4685 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 4686 Diag(PrevInit->getLocation(), diag::note_previous_definition); 4687 return; 4688 } 4689 4690 if (VDecl->hasLocalStorage()) 4691 getCurFunction()->setHasBranchProtectedScope(); 4692 4693 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 4694 VDecl->setInvalidDecl(); 4695 return; 4696 } 4697 } 4698 4699 // Capture the variable that is being initialized and the style of 4700 // initialization. 4701 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4702 4703 // FIXME: Poor source location information. 4704 InitializationKind Kind 4705 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 4706 Init->getLocStart(), 4707 Init->getLocEnd()) 4708 : InitializationKind::CreateCopy(VDecl->getLocation(), 4709 Init->getLocStart()); 4710 4711 // Get the decls type and save a reference for later, since 4712 // CheckInitializerTypes may change it. 4713 QualType DclT = VDecl->getType(), SavT = DclT; 4714 if (VDecl->isLocalVarDecl()) { 4715 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 4716 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 4717 VDecl->setInvalidDecl(); 4718 } else if (!VDecl->isInvalidDecl()) { 4719 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4720 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4721 MultiExprArg(*this, &Init, 1), 4722 &DclT); 4723 if (Result.isInvalid()) { 4724 VDecl->setInvalidDecl(); 4725 return; 4726 } 4727 4728 Init = Result.takeAs<Expr>(); 4729 4730 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4731 // Don't check invalid declarations to avoid emitting useless diagnostics. 4732 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4733 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 4734 CheckForConstantInitializer(Init, DclT); 4735 } 4736 } 4737 } else if (VDecl->isStaticDataMember() && 4738 VDecl->getLexicalDeclContext()->isRecord()) { 4739 // This is an in-class initialization for a static data member, e.g., 4740 // 4741 // struct S { 4742 // static const int value = 17; 4743 // }; 4744 4745 // Try to perform the initialization regardless. 4746 if (!VDecl->isInvalidDecl()) { 4747 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4748 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4749 MultiExprArg(*this, &Init, 1), 4750 &DclT); 4751 if (Result.isInvalid()) { 4752 VDecl->setInvalidDecl(); 4753 return; 4754 } 4755 4756 Init = Result.takeAs<Expr>(); 4757 } 4758 4759 // C++ [class.mem]p4: 4760 // A member-declarator can contain a constant-initializer only 4761 // if it declares a static member (9.4) of const integral or 4762 // const enumeration type, see 9.4.2. 4763 QualType T = VDecl->getType(); 4764 4765 // Do nothing on dependent types. 4766 if (T->isDependentType()) { 4767 4768 // Require constness. 4769 } else if (!T.isConstQualified()) { 4770 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 4771 << Init->getSourceRange(); 4772 VDecl->setInvalidDecl(); 4773 4774 // We allow integer constant expressions in all cases. 4775 } else if (T->isIntegralOrEnumerationType()) { 4776 if (!Init->isValueDependent()) { 4777 // Check whether the expression is a constant expression. 4778 llvm::APSInt Value; 4779 SourceLocation Loc; 4780 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 4781 Diag(Loc, diag::err_in_class_initializer_non_constant) 4782 << Init->getSourceRange(); 4783 VDecl->setInvalidDecl(); 4784 } 4785 } 4786 4787 // We allow floating-point constants as an extension in C++03, and 4788 // C++0x has far more complicated rules that we don't really 4789 // implement fully. 4790 } else { 4791 bool Allowed = false; 4792 if (getLangOptions().CPlusPlus0x) { 4793 Allowed = T->isLiteralType(); 4794 } else if (T->isFloatingType()) { // also permits complex, which is ok 4795 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 4796 << T << Init->getSourceRange(); 4797 Allowed = true; 4798 } 4799 4800 if (!Allowed) { 4801 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 4802 << T << Init->getSourceRange(); 4803 VDecl->setInvalidDecl(); 4804 4805 // TODO: there are probably expressions that pass here that shouldn't. 4806 } else if (!Init->isValueDependent() && 4807 !Init->isConstantInitializer(Context, false)) { 4808 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 4809 << Init->getSourceRange(); 4810 VDecl->setInvalidDecl(); 4811 } 4812 } 4813 } else if (VDecl->isFileVarDecl()) { 4814 if (VDecl->getStorageClassAsWritten() == SC_Extern && 4815 (!getLangOptions().CPlusPlus || 4816 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 4817 Diag(VDecl->getLocation(), diag::warn_extern_init); 4818 if (!VDecl->isInvalidDecl()) { 4819 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4820 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4821 MultiExprArg(*this, &Init, 1), 4822 &DclT); 4823 if (Result.isInvalid()) { 4824 VDecl->setInvalidDecl(); 4825 return; 4826 } 4827 4828 Init = Result.takeAs<Expr>(); 4829 } 4830 4831 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4832 // Don't check invalid declarations to avoid emitting useless diagnostics. 4833 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4834 // C99 6.7.8p4. All file scoped initializers need to be constant. 4835 CheckForConstantInitializer(Init, DclT); 4836 } 4837 } 4838 // If the type changed, it means we had an incomplete type that was 4839 // completed by the initializer. For example: 4840 // int ary[] = { 1, 3, 5 }; 4841 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 4842 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 4843 VDecl->setType(DclT); 4844 Init->setType(DclT); 4845 } 4846 4847 4848 // If this variable is a local declaration with record type, make sure it 4849 // doesn't have a flexible member initialization. We only support this as a 4850 // global/static definition. 4851 if (VDecl->hasLocalStorage()) 4852 if (const RecordType *RT = VDecl->getType()->getAs<RecordType>()) 4853 if (RT->getDecl()->hasFlexibleArrayMember()) { 4854 // Check whether the initializer tries to initialize the flexible 4855 // array member itself to anything other than an empty initializer list. 4856 if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) { 4857 unsigned Index = std::distance(RT->getDecl()->field_begin(), 4858 RT->getDecl()->field_end()) - 1; 4859 if (Index < ILE->getNumInits() && 4860 !(isa<InitListExpr>(ILE->getInit(Index)) && 4861 cast<InitListExpr>(ILE->getInit(Index))->getNumInits() == 0)) { 4862 Diag(VDecl->getLocation(), diag::err_nonstatic_flexible_variable); 4863 VDecl->setInvalidDecl(); 4864 } 4865 } 4866 } 4867 4868 // Check any implicit conversions within the expression. 4869 CheckImplicitConversions(Init, VDecl->getLocation()); 4870 4871 Init = MaybeCreateExprWithCleanups(Init); 4872 // Attach the initializer to the decl. 4873 VDecl->setInit(Init); 4874 4875 CheckCompleteVariableDeclaration(VDecl); 4876} 4877 4878/// ActOnInitializerError - Given that there was an error parsing an 4879/// initializer for the given declaration, try to return to some form 4880/// of sanity. 4881void Sema::ActOnInitializerError(Decl *D) { 4882 // Our main concern here is re-establishing invariants like "a 4883 // variable's type is either dependent or complete". 4884 if (!D || D->isInvalidDecl()) return; 4885 4886 VarDecl *VD = dyn_cast<VarDecl>(D); 4887 if (!VD) return; 4888 4889 // Auto types are meaningless if we can't make sense of the initializer. 4890 if (ParsingInitForAutoVars.count(D)) { 4891 D->setInvalidDecl(); 4892 return; 4893 } 4894 4895 QualType Ty = VD->getType(); 4896 if (Ty->isDependentType()) return; 4897 4898 // Require a complete type. 4899 if (RequireCompleteType(VD->getLocation(), 4900 Context.getBaseElementType(Ty), 4901 diag::err_typecheck_decl_incomplete_type)) { 4902 VD->setInvalidDecl(); 4903 return; 4904 } 4905 4906 // Require an abstract type. 4907 if (RequireNonAbstractType(VD->getLocation(), Ty, 4908 diag::err_abstract_type_in_decl, 4909 AbstractVariableType)) { 4910 VD->setInvalidDecl(); 4911 return; 4912 } 4913 4914 // Don't bother complaining about constructors or destructors, 4915 // though. 4916} 4917 4918void Sema::ActOnUninitializedDecl(Decl *RealDecl, 4919 bool TypeMayContainAuto) { 4920 // If there is no declaration, there was an error parsing it. Just ignore it. 4921 if (RealDecl == 0) 4922 return; 4923 4924 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 4925 QualType Type = Var->getType(); 4926 4927 // C++0x [dcl.spec.auto]p3 4928 if (TypeMayContainAuto && Type->getContainedAutoType()) { 4929 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 4930 << Var->getDeclName() << Type; 4931 Var->setInvalidDecl(); 4932 return; 4933 } 4934 4935 switch (Var->isThisDeclarationADefinition()) { 4936 case VarDecl::Definition: 4937 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 4938 break; 4939 4940 // We have an out-of-line definition of a static data member 4941 // that has an in-class initializer, so we type-check this like 4942 // a declaration. 4943 // 4944 // Fall through 4945 4946 case VarDecl::DeclarationOnly: 4947 // It's only a declaration. 4948 4949 // Block scope. C99 6.7p7: If an identifier for an object is 4950 // declared with no linkage (C99 6.2.2p6), the type for the 4951 // object shall be complete. 4952 if (!Type->isDependentType() && Var->isLocalVarDecl() && 4953 !Var->getLinkage() && !Var->isInvalidDecl() && 4954 RequireCompleteType(Var->getLocation(), Type, 4955 diag::err_typecheck_decl_incomplete_type)) 4956 Var->setInvalidDecl(); 4957 4958 // Make sure that the type is not abstract. 4959 if (!Type->isDependentType() && !Var->isInvalidDecl() && 4960 RequireNonAbstractType(Var->getLocation(), Type, 4961 diag::err_abstract_type_in_decl, 4962 AbstractVariableType)) 4963 Var->setInvalidDecl(); 4964 return; 4965 4966 case VarDecl::TentativeDefinition: 4967 // File scope. C99 6.9.2p2: A declaration of an identifier for an 4968 // object that has file scope without an initializer, and without a 4969 // storage-class specifier or with the storage-class specifier "static", 4970 // constitutes a tentative definition. Note: A tentative definition with 4971 // external linkage is valid (C99 6.2.2p5). 4972 if (!Var->isInvalidDecl()) { 4973 if (const IncompleteArrayType *ArrayT 4974 = Context.getAsIncompleteArrayType(Type)) { 4975 if (RequireCompleteType(Var->getLocation(), 4976 ArrayT->getElementType(), 4977 diag::err_illegal_decl_array_incomplete_type)) 4978 Var->setInvalidDecl(); 4979 } else if (Var->getStorageClass() == SC_Static) { 4980 // C99 6.9.2p3: If the declaration of an identifier for an object is 4981 // a tentative definition and has internal linkage (C99 6.2.2p3), the 4982 // declared type shall not be an incomplete type. 4983 // NOTE: code such as the following 4984 // static struct s; 4985 // struct s { int a; }; 4986 // is accepted by gcc. Hence here we issue a warning instead of 4987 // an error and we do not invalidate the static declaration. 4988 // NOTE: to avoid multiple warnings, only check the first declaration. 4989 if (Var->getPreviousDeclaration() == 0) 4990 RequireCompleteType(Var->getLocation(), Type, 4991 diag::ext_typecheck_decl_incomplete_type); 4992 } 4993 } 4994 4995 // Record the tentative definition; we're done. 4996 if (!Var->isInvalidDecl()) 4997 TentativeDefinitions.push_back(Var); 4998 return; 4999 } 5000 5001 // Provide a specific diagnostic for uninitialized variable 5002 // definitions with incomplete array type. 5003 if (Type->isIncompleteArrayType()) { 5004 Diag(Var->getLocation(), 5005 diag::err_typecheck_incomplete_array_needs_initializer); 5006 Var->setInvalidDecl(); 5007 return; 5008 } 5009 5010 // Provide a specific diagnostic for uninitialized variable 5011 // definitions with reference type. 5012 if (Type->isReferenceType()) { 5013 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 5014 << Var->getDeclName() 5015 << SourceRange(Var->getLocation(), Var->getLocation()); 5016 Var->setInvalidDecl(); 5017 return; 5018 } 5019 5020 // Do not attempt to type-check the default initializer for a 5021 // variable with dependent type. 5022 if (Type->isDependentType()) 5023 return; 5024 5025 if (Var->isInvalidDecl()) 5026 return; 5027 5028 if (RequireCompleteType(Var->getLocation(), 5029 Context.getBaseElementType(Type), 5030 diag::err_typecheck_decl_incomplete_type)) { 5031 Var->setInvalidDecl(); 5032 return; 5033 } 5034 5035 // The variable can not have an abstract class type. 5036 if (RequireNonAbstractType(Var->getLocation(), Type, 5037 diag::err_abstract_type_in_decl, 5038 AbstractVariableType)) { 5039 Var->setInvalidDecl(); 5040 return; 5041 } 5042 5043 const RecordType *Record 5044 = Context.getBaseElementType(Type)->getAs<RecordType>(); 5045 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 5046 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 5047 // C++03 [dcl.init]p9: 5048 // If no initializer is specified for an object, and the 5049 // object is of (possibly cv-qualified) non-POD class type (or 5050 // array thereof), the object shall be default-initialized; if 5051 // the object is of const-qualified type, the underlying class 5052 // type shall have a user-declared default 5053 // constructor. Otherwise, if no initializer is specified for 5054 // a non- static object, the object and its subobjects, if 5055 // any, have an indeterminate initial value); if the object 5056 // or any of its subobjects are of const-qualified type, the 5057 // program is ill-formed. 5058 // FIXME: DPG thinks it is very fishy that C++0x disables this. 5059 } else { 5060 // Check for jumps past the implicit initializer. C++0x 5061 // clarifies that this applies to a "variable with automatic 5062 // storage duration", not a "local variable". 5063 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) 5064 getCurFunction()->setHasBranchProtectedScope(); 5065 5066 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 5067 InitializationKind Kind 5068 = InitializationKind::CreateDefault(Var->getLocation()); 5069 5070 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 5071 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 5072 MultiExprArg(*this, 0, 0)); 5073 if (Init.isInvalid()) 5074 Var->setInvalidDecl(); 5075 else if (Init.get()) 5076 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 5077 } 5078 5079 CheckCompleteVariableDeclaration(Var); 5080 } 5081} 5082 5083void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 5084 if (var->isInvalidDecl()) return; 5085 5086 // All the following checks are C++ only. 5087 if (!getLangOptions().CPlusPlus) return; 5088 5089 QualType baseType = Context.getBaseElementType(var->getType()); 5090 if (baseType->isDependentType()) return; 5091 5092 // __block variables might require us to capture a copy-initializer. 5093 if (var->hasAttr<BlocksAttr>()) { 5094 // It's currently invalid to ever have a __block variable with an 5095 // array type; should we diagnose that here? 5096 5097 // Regardless, we don't want to ignore array nesting when 5098 // constructing this copy. 5099 QualType type = var->getType(); 5100 5101 if (type->isStructureOrClassType()) { 5102 SourceLocation poi = var->getLocation(); 5103 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 5104 ExprResult result = 5105 PerformCopyInitialization( 5106 InitializedEntity::InitializeBlock(poi, type, false), 5107 poi, Owned(varRef)); 5108 if (!result.isInvalid()) { 5109 result = MaybeCreateExprWithCleanups(result); 5110 Expr *init = result.takeAs<Expr>(); 5111 Context.setBlockVarCopyInits(var, init); 5112 } 5113 } 5114 } 5115 5116 // Check for global constructors. 5117 if (!var->getDeclContext()->isDependentContext() && 5118 var->hasGlobalStorage() && 5119 !var->isStaticLocal() && 5120 var->getInit() && 5121 !var->getInit()->isConstantInitializer(Context, 5122 baseType->isReferenceType())) 5123 Diag(var->getLocation(), diag::warn_global_constructor) 5124 << var->getInit()->getSourceRange(); 5125 5126 // Require the destructor. 5127 if (const RecordType *recordType = baseType->getAs<RecordType>()) 5128 FinalizeVarWithDestructor(var, recordType); 5129} 5130 5131/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 5132/// any semantic actions necessary after any initializer has been attached. 5133void 5134Sema::FinalizeDeclaration(Decl *ThisDecl) { 5135 // Note that we are no longer parsing the initializer for this declaration. 5136 ParsingInitForAutoVars.erase(ThisDecl); 5137} 5138 5139Sema::DeclGroupPtrTy 5140Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 5141 Decl **Group, unsigned NumDecls) { 5142 llvm::SmallVector<Decl*, 8> Decls; 5143 5144 if (DS.isTypeSpecOwned()) 5145 Decls.push_back(DS.getRepAsDecl()); 5146 5147 for (unsigned i = 0; i != NumDecls; ++i) 5148 if (Decl *D = Group[i]) 5149 Decls.push_back(D); 5150 5151 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 5152 DS.getTypeSpecType() == DeclSpec::TST_auto); 5153} 5154 5155/// BuildDeclaratorGroup - convert a list of declarations into a declaration 5156/// group, performing any necessary semantic checking. 5157Sema::DeclGroupPtrTy 5158Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 5159 bool TypeMayContainAuto) { 5160 // C++0x [dcl.spec.auto]p7: 5161 // If the type deduced for the template parameter U is not the same in each 5162 // deduction, the program is ill-formed. 5163 // FIXME: When initializer-list support is added, a distinction is needed 5164 // between the deduced type U and the deduced type which 'auto' stands for. 5165 // auto a = 0, b = { 1, 2, 3 }; 5166 // is legal because the deduced type U is 'int' in both cases. 5167 if (TypeMayContainAuto && NumDecls > 1) { 5168 QualType Deduced; 5169 CanQualType DeducedCanon; 5170 VarDecl *DeducedDecl = 0; 5171 for (unsigned i = 0; i != NumDecls; ++i) { 5172 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 5173 AutoType *AT = D->getType()->getContainedAutoType(); 5174 // Don't reissue diagnostics when instantiating a template. 5175 if (AT && D->isInvalidDecl()) 5176 break; 5177 if (AT && AT->isDeduced()) { 5178 QualType U = AT->getDeducedType(); 5179 CanQualType UCanon = Context.getCanonicalType(U); 5180 if (Deduced.isNull()) { 5181 Deduced = U; 5182 DeducedCanon = UCanon; 5183 DeducedDecl = D; 5184 } else if (DeducedCanon != UCanon) { 5185 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 5186 diag::err_auto_different_deductions) 5187 << Deduced << DeducedDecl->getDeclName() 5188 << U << D->getDeclName() 5189 << DeducedDecl->getInit()->getSourceRange() 5190 << D->getInit()->getSourceRange(); 5191 D->setInvalidDecl(); 5192 break; 5193 } 5194 } 5195 } 5196 } 5197 } 5198 5199 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 5200} 5201 5202 5203/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 5204/// to introduce parameters into function prototype scope. 5205Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 5206 const DeclSpec &DS = D.getDeclSpec(); 5207 5208 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 5209 VarDecl::StorageClass StorageClass = SC_None; 5210 VarDecl::StorageClass StorageClassAsWritten = SC_None; 5211 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 5212 StorageClass = SC_Register; 5213 StorageClassAsWritten = SC_Register; 5214 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 5215 Diag(DS.getStorageClassSpecLoc(), 5216 diag::err_invalid_storage_class_in_func_decl); 5217 D.getMutableDeclSpec().ClearStorageClassSpecs(); 5218 } 5219 5220 if (D.getDeclSpec().isThreadSpecified()) 5221 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5222 5223 DiagnoseFunctionSpecifiers(D); 5224 5225 TagDecl *OwnedDecl = 0; 5226 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 5227 QualType parmDeclType = TInfo->getType(); 5228 5229 if (getLangOptions().CPlusPlus) { 5230 // Check that there are no default arguments inside the type of this 5231 // parameter. 5232 CheckExtraCXXDefaultArguments(D); 5233 5234 if (OwnedDecl && OwnedDecl->isDefinition()) { 5235 // C++ [dcl.fct]p6: 5236 // Types shall not be defined in return or parameter types. 5237 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 5238 << Context.getTypeDeclType(OwnedDecl); 5239 } 5240 5241 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 5242 if (D.getCXXScopeSpec().isSet()) { 5243 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 5244 << D.getCXXScopeSpec().getRange(); 5245 D.getCXXScopeSpec().clear(); 5246 } 5247 } 5248 5249 // Ensure we have a valid name 5250 IdentifierInfo *II = 0; 5251 if (D.hasName()) { 5252 II = D.getIdentifier(); 5253 if (!II) { 5254 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 5255 << GetNameForDeclarator(D).getName().getAsString(); 5256 D.setInvalidType(true); 5257 } 5258 } 5259 5260 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 5261 if (II) { 5262 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 5263 ForRedeclaration); 5264 LookupName(R, S); 5265 if (R.isSingleResult()) { 5266 NamedDecl *PrevDecl = R.getFoundDecl(); 5267 if (PrevDecl->isTemplateParameter()) { 5268 // Maybe we will complain about the shadowed template parameter. 5269 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5270 // Just pretend that we didn't see the previous declaration. 5271 PrevDecl = 0; 5272 } else if (S->isDeclScope(PrevDecl)) { 5273 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 5274 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5275 5276 // Recover by removing the name 5277 II = 0; 5278 D.SetIdentifier(0, D.getIdentifierLoc()); 5279 D.setInvalidType(true); 5280 } 5281 } 5282 } 5283 5284 // Temporarily put parameter variables in the translation unit, not 5285 // the enclosing context. This prevents them from accidentally 5286 // looking like class members in C++. 5287 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 5288 TInfo, parmDeclType, II, 5289 D.getIdentifierLoc(), 5290 StorageClass, StorageClassAsWritten); 5291 5292 if (D.isInvalidType()) 5293 New->setInvalidDecl(); 5294 5295 // Add the parameter declaration into this scope. 5296 S->AddDecl(New); 5297 if (II) 5298 IdResolver.AddDecl(New); 5299 5300 ProcessDeclAttributes(S, New, D); 5301 5302 if (New->hasAttr<BlocksAttr>()) { 5303 Diag(New->getLocation(), diag::err_block_on_nonlocal); 5304 } 5305 return New; 5306} 5307 5308/// \brief Synthesizes a variable for a parameter arising from a 5309/// typedef. 5310ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 5311 SourceLocation Loc, 5312 QualType T) { 5313 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, 0, 5314 T, Context.getTrivialTypeSourceInfo(T, Loc), 5315 SC_None, SC_None, 0); 5316 Param->setImplicit(); 5317 return Param; 5318} 5319 5320void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 5321 ParmVarDecl * const *ParamEnd) { 5322 // Don't diagnose unused-parameter errors in template instantiations; we 5323 // will already have done so in the template itself. 5324 if (!ActiveTemplateInstantiations.empty()) 5325 return; 5326 5327 for (; Param != ParamEnd; ++Param) { 5328 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 5329 !(*Param)->hasAttr<UnusedAttr>()) { 5330 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 5331 << (*Param)->getDeclName(); 5332 } 5333 } 5334} 5335 5336void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 5337 ParmVarDecl * const *ParamEnd, 5338 QualType ReturnTy, 5339 NamedDecl *D) { 5340 if (LangOpts.NumLargeByValueCopy == 0) // No check. 5341 return; 5342 5343 // Warn if the return value is pass-by-value and larger than the specified 5344 // threshold. 5345 if (ReturnTy->isPODType()) { 5346 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 5347 if (Size > LangOpts.NumLargeByValueCopy) 5348 Diag(D->getLocation(), diag::warn_return_value_size) 5349 << D->getDeclName() << Size; 5350 } 5351 5352 // Warn if any parameter is pass-by-value and larger than the specified 5353 // threshold. 5354 for (; Param != ParamEnd; ++Param) { 5355 QualType T = (*Param)->getType(); 5356 if (!T->isPODType()) 5357 continue; 5358 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 5359 if (Size > LangOpts.NumLargeByValueCopy) 5360 Diag((*Param)->getLocation(), diag::warn_parameter_size) 5361 << (*Param)->getDeclName() << Size; 5362 } 5363} 5364 5365ParmVarDecl *Sema::CheckParameter(DeclContext *DC, 5366 TypeSourceInfo *TSInfo, QualType T, 5367 IdentifierInfo *Name, 5368 SourceLocation NameLoc, 5369 VarDecl::StorageClass StorageClass, 5370 VarDecl::StorageClass StorageClassAsWritten) { 5371 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, NameLoc, Name, 5372 adjustParameterType(T), TSInfo, 5373 StorageClass, StorageClassAsWritten, 5374 0); 5375 5376 // Parameters can not be abstract class types. 5377 // For record types, this is done by the AbstractClassUsageDiagnoser once 5378 // the class has been completely parsed. 5379 if (!CurContext->isRecord() && 5380 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 5381 AbstractParamType)) 5382 New->setInvalidDecl(); 5383 5384 // Parameter declarators cannot be interface types. All ObjC objects are 5385 // passed by reference. 5386 if (T->isObjCObjectType()) { 5387 Diag(NameLoc, 5388 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 5389 New->setInvalidDecl(); 5390 } 5391 5392 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 5393 // duration shall not be qualified by an address-space qualifier." 5394 // Since all parameters have automatic store duration, they can not have 5395 // an address space. 5396 if (T.getAddressSpace() != 0) { 5397 Diag(NameLoc, diag::err_arg_with_address_space); 5398 New->setInvalidDecl(); 5399 } 5400 5401 return New; 5402} 5403 5404void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 5405 SourceLocation LocAfterDecls) { 5406 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5407 5408 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 5409 // for a K&R function. 5410 if (!FTI.hasPrototype) { 5411 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 5412 --i; 5413 if (FTI.ArgInfo[i].Param == 0) { 5414 llvm::SmallString<256> Code; 5415 llvm::raw_svector_ostream(Code) << " int " 5416 << FTI.ArgInfo[i].Ident->getName() 5417 << ";\n"; 5418 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 5419 << FTI.ArgInfo[i].Ident 5420 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 5421 5422 // Implicitly declare the argument as type 'int' for lack of a better 5423 // type. 5424 DeclSpec DS; 5425 const char* PrevSpec; // unused 5426 unsigned DiagID; // unused 5427 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 5428 PrevSpec, DiagID); 5429 Declarator ParamD(DS, Declarator::KNRTypeListContext); 5430 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 5431 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 5432 } 5433 } 5434 } 5435} 5436 5437Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 5438 Declarator &D) { 5439 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 5440 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 5441 Scope *ParentScope = FnBodyScope->getParent(); 5442 5443 Decl *DP = HandleDeclarator(ParentScope, D, 5444 MultiTemplateParamsArg(*this), 5445 /*IsFunctionDefinition=*/true); 5446 return ActOnStartOfFunctionDef(FnBodyScope, DP); 5447} 5448 5449static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 5450 // Don't warn about invalid declarations. 5451 if (FD->isInvalidDecl()) 5452 return false; 5453 5454 // Or declarations that aren't global. 5455 if (!FD->isGlobal()) 5456 return false; 5457 5458 // Don't warn about C++ member functions. 5459 if (isa<CXXMethodDecl>(FD)) 5460 return false; 5461 5462 // Don't warn about 'main'. 5463 if (FD->isMain()) 5464 return false; 5465 5466 // Don't warn about inline functions. 5467 if (FD->isInlineSpecified()) 5468 return false; 5469 5470 // Don't warn about function templates. 5471 if (FD->getDescribedFunctionTemplate()) 5472 return false; 5473 5474 // Don't warn about function template specializations. 5475 if (FD->isFunctionTemplateSpecialization()) 5476 return false; 5477 5478 bool MissingPrototype = true; 5479 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 5480 Prev; Prev = Prev->getPreviousDeclaration()) { 5481 // Ignore any declarations that occur in function or method 5482 // scope, because they aren't visible from the header. 5483 if (Prev->getDeclContext()->isFunctionOrMethod()) 5484 continue; 5485 5486 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 5487 break; 5488 } 5489 5490 return MissingPrototype; 5491} 5492 5493Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 5494 // Clear the last template instantiation error context. 5495 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 5496 5497 if (!D) 5498 return D; 5499 FunctionDecl *FD = 0; 5500 5501 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 5502 FD = FunTmpl->getTemplatedDecl(); 5503 else 5504 FD = cast<FunctionDecl>(D); 5505 5506 // Enter a new function scope 5507 PushFunctionScope(); 5508 5509 // See if this is a redefinition. 5510 // But don't complain if we're in GNU89 mode and the previous definition 5511 // was an extern inline function. 5512 const FunctionDecl *Definition; 5513 if (FD->hasBody(Definition) && 5514 !canRedefineFunction(Definition, getLangOptions())) { 5515 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 5516 Definition->getStorageClass() == SC_Extern) 5517 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 5518 << FD->getDeclName() << getLangOptions().CPlusPlus; 5519 else 5520 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 5521 Diag(Definition->getLocation(), diag::note_previous_definition); 5522 } 5523 5524 // Builtin functions cannot be defined. 5525 if (unsigned BuiltinID = FD->getBuiltinID()) { 5526 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 5527 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 5528 FD->setInvalidDecl(); 5529 } 5530 } 5531 5532 // The return type of a function definition must be complete 5533 // (C99 6.9.1p3, C++ [dcl.fct]p6). 5534 QualType ResultType = FD->getResultType(); 5535 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 5536 !FD->isInvalidDecl() && 5537 RequireCompleteType(FD->getLocation(), ResultType, 5538 diag::err_func_def_incomplete_result)) 5539 FD->setInvalidDecl(); 5540 5541 // GNU warning -Wmissing-prototypes: 5542 // Warn if a global function is defined without a previous 5543 // prototype declaration. This warning is issued even if the 5544 // definition itself provides a prototype. The aim is to detect 5545 // global functions that fail to be declared in header files. 5546 if (ShouldWarnAboutMissingPrototype(FD)) 5547 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 5548 5549 if (FnBodyScope) 5550 PushDeclContext(FnBodyScope, FD); 5551 5552 // Check the validity of our function parameters 5553 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 5554 /*CheckParameterNames=*/true); 5555 5556 // Introduce our parameters into the function scope 5557 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 5558 ParmVarDecl *Param = FD->getParamDecl(p); 5559 Param->setOwningFunction(FD); 5560 5561 // If this has an identifier, add it to the scope stack. 5562 if (Param->getIdentifier() && FnBodyScope) { 5563 CheckShadow(FnBodyScope, Param); 5564 5565 PushOnScopeChains(Param, FnBodyScope); 5566 } 5567 } 5568 5569 // Checking attributes of current function definition 5570 // dllimport attribute. 5571 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 5572 if (DA && (!FD->getAttr<DLLExportAttr>())) { 5573 // dllimport attribute cannot be directly applied to definition. 5574 if (!DA->isInherited()) { 5575 Diag(FD->getLocation(), 5576 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 5577 << "dllimport"; 5578 FD->setInvalidDecl(); 5579 return FD; 5580 } 5581 5582 // Visual C++ appears to not think this is an issue, so only issue 5583 // a warning when Microsoft extensions are disabled. 5584 if (!LangOpts.Microsoft) { 5585 // If a symbol previously declared dllimport is later defined, the 5586 // attribute is ignored in subsequent references, and a warning is 5587 // emitted. 5588 Diag(FD->getLocation(), 5589 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 5590 << FD->getName() << "dllimport"; 5591 } 5592 } 5593 return FD; 5594} 5595 5596/// \brief Given the set of return statements within a function body, 5597/// compute the variables that are subject to the named return value 5598/// optimization. 5599/// 5600/// Each of the variables that is subject to the named return value 5601/// optimization will be marked as NRVO variables in the AST, and any 5602/// return statement that has a marked NRVO variable as its NRVO candidate can 5603/// use the named return value optimization. 5604/// 5605/// This function applies a very simplistic algorithm for NRVO: if every return 5606/// statement in the function has the same NRVO candidate, that candidate is 5607/// the NRVO variable. 5608/// 5609/// FIXME: Employ a smarter algorithm that accounts for multiple return 5610/// statements and the lifetimes of the NRVO candidates. We should be able to 5611/// find a maximal set of NRVO variables. 5612static void ComputeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 5613 ReturnStmt **Returns = Scope->Returns.data(); 5614 5615 const VarDecl *NRVOCandidate = 0; 5616 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 5617 if (!Returns[I]->getNRVOCandidate()) 5618 return; 5619 5620 if (!NRVOCandidate) 5621 NRVOCandidate = Returns[I]->getNRVOCandidate(); 5622 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 5623 return; 5624 } 5625 5626 if (NRVOCandidate) 5627 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 5628} 5629 5630Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 5631 return ActOnFinishFunctionBody(D, move(BodyArg), false); 5632} 5633 5634Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 5635 bool IsInstantiation) { 5636 FunctionDecl *FD = 0; 5637 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 5638 if (FunTmpl) 5639 FD = FunTmpl->getTemplatedDecl(); 5640 else 5641 FD = dyn_cast_or_null<FunctionDecl>(dcl); 5642 5643 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 5644 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 5645 5646 if (FD) { 5647 FD->setBody(Body); 5648 if (FD->isMain()) { 5649 // C and C++ allow for main to automagically return 0. 5650 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 5651 FD->setHasImplicitReturnZero(true); 5652 WP.disableCheckFallThrough(); 5653 } 5654 5655 if (!FD->isInvalidDecl()) { 5656 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 5657 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 5658 FD->getResultType(), FD); 5659 5660 // If this is a constructor, we need a vtable. 5661 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 5662 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 5663 5664 ComputeNRVO(Body, getCurFunction()); 5665 } 5666 5667 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 5668 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 5669 assert(MD == getCurMethodDecl() && "Method parsing confused"); 5670 MD->setBody(Body); 5671 if (Body) 5672 MD->setEndLoc(Body->getLocEnd()); 5673 if (!MD->isInvalidDecl()) { 5674 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 5675 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 5676 MD->getResultType(), MD); 5677 } 5678 } else { 5679 return 0; 5680 } 5681 5682 // Verify and clean out per-function state. 5683 if (Body) { 5684 // C++ constructors that have function-try-blocks can't have return 5685 // statements in the handlers of that block. (C++ [except.handle]p14) 5686 // Verify this. 5687 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 5688 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 5689 5690 // Verify that that gotos and switch cases don't jump into scopes illegally. 5691 // Verify that that gotos and switch cases don't jump into scopes illegally. 5692 if (getCurFunction()->NeedsScopeChecking() && 5693 !dcl->isInvalidDecl() && 5694 !hasAnyErrorsInThisFunction()) 5695 DiagnoseInvalidJumps(Body); 5696 5697 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 5698 if (!Destructor->getParent()->isDependentType()) 5699 CheckDestructor(Destructor); 5700 5701 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5702 Destructor->getParent()); 5703 } 5704 5705 // If any errors have occurred, clear out any temporaries that may have 5706 // been leftover. This ensures that these temporaries won't be picked up for 5707 // deletion in some later function. 5708 if (PP.getDiagnostics().hasErrorOccurred() || 5709 PP.getDiagnostics().getSuppressAllDiagnostics()) 5710 ExprTemporaries.clear(); 5711 else if (!isa<FunctionTemplateDecl>(dcl)) { 5712 // Since the body is valid, issue any analysis-based warnings that are 5713 // enabled. 5714 ActivePolicy = &WP; 5715 } 5716 5717 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 5718 } 5719 5720 if (!IsInstantiation) 5721 PopDeclContext(); 5722 5723 PopFunctionOrBlockScope(ActivePolicy, dcl); 5724 5725 // If any errors have occurred, clear out any temporaries that may have 5726 // been leftover. This ensures that these temporaries won't be picked up for 5727 // deletion in some later function. 5728 if (getDiagnostics().hasErrorOccurred()) 5729 ExprTemporaries.clear(); 5730 5731 return dcl; 5732} 5733 5734/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 5735/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 5736NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 5737 IdentifierInfo &II, Scope *S) { 5738 // Before we produce a declaration for an implicitly defined 5739 // function, see whether there was a locally-scoped declaration of 5740 // this name as a function or variable. If so, use that 5741 // (non-visible) declaration, and complain about it. 5742 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5743 = LocallyScopedExternalDecls.find(&II); 5744 if (Pos != LocallyScopedExternalDecls.end()) { 5745 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 5746 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 5747 return Pos->second; 5748 } 5749 5750 // Extension in C99. Legal in C90, but warn about it. 5751 if (II.getName().startswith("__builtin_")) 5752 Diag(Loc, diag::warn_builtin_unknown) << &II; 5753 else if (getLangOptions().C99) 5754 Diag(Loc, diag::ext_implicit_function_decl) << &II; 5755 else 5756 Diag(Loc, diag::warn_implicit_function_decl) << &II; 5757 5758 // Set a Declarator for the implicit definition: int foo(); 5759 const char *Dummy; 5760 DeclSpec DS; 5761 unsigned DiagID; 5762 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 5763 (void)Error; // Silence warning. 5764 assert(!Error && "Error setting up implicit decl!"); 5765 Declarator D(DS, Declarator::BlockContext); 5766 D.AddTypeInfo(DeclaratorChunk::getFunction(ParsedAttributes(), 5767 false, false, SourceLocation(), 0, 5768 0, 0, true, SourceLocation(), 5769 EST_None, SourceLocation(), 5770 0, 0, 0, 0, Loc, Loc, D), 5771 SourceLocation()); 5772 D.SetIdentifier(&II, Loc); 5773 5774 // Insert this function into translation-unit scope. 5775 5776 DeclContext *PrevDC = CurContext; 5777 CurContext = Context.getTranslationUnitDecl(); 5778 5779 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 5780 FD->setImplicit(); 5781 5782 CurContext = PrevDC; 5783 5784 AddKnownFunctionAttributes(FD); 5785 5786 return FD; 5787} 5788 5789/// \brief Adds any function attributes that we know a priori based on 5790/// the declaration of this function. 5791/// 5792/// These attributes can apply both to implicitly-declared builtins 5793/// (like __builtin___printf_chk) or to library-declared functions 5794/// like NSLog or printf. 5795void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 5796 if (FD->isInvalidDecl()) 5797 return; 5798 5799 // If this is a built-in function, map its builtin attributes to 5800 // actual attributes. 5801 if (unsigned BuiltinID = FD->getBuiltinID()) { 5802 // Handle printf-formatting attributes. 5803 unsigned FormatIdx; 5804 bool HasVAListArg; 5805 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 5806 if (!FD->getAttr<FormatAttr>()) 5807 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5808 "printf", FormatIdx+1, 5809 HasVAListArg ? 0 : FormatIdx+2)); 5810 } 5811 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 5812 HasVAListArg)) { 5813 if (!FD->getAttr<FormatAttr>()) 5814 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5815 "scanf", FormatIdx+1, 5816 HasVAListArg ? 0 : FormatIdx+2)); 5817 } 5818 5819 // Mark const if we don't care about errno and that is the only 5820 // thing preventing the function from being const. This allows 5821 // IRgen to use LLVM intrinsics for such functions. 5822 if (!getLangOptions().MathErrno && 5823 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 5824 if (!FD->getAttr<ConstAttr>()) 5825 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5826 } 5827 5828 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 5829 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 5830 if (Context.BuiltinInfo.isConst(BuiltinID)) 5831 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5832 } 5833 5834 IdentifierInfo *Name = FD->getIdentifier(); 5835 if (!Name) 5836 return; 5837 if ((!getLangOptions().CPlusPlus && 5838 FD->getDeclContext()->isTranslationUnit()) || 5839 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 5840 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 5841 LinkageSpecDecl::lang_c)) { 5842 // Okay: this could be a libc/libm/Objective-C function we know 5843 // about. 5844 } else 5845 return; 5846 5847 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 5848 // FIXME: NSLog and NSLogv should be target specific 5849 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 5850 // FIXME: We known better than our headers. 5851 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 5852 } else 5853 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5854 "printf", 1, 5855 Name->isStr("NSLogv") ? 0 : 2)); 5856 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 5857 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 5858 // target-specific builtins, perhaps? 5859 if (!FD->getAttr<FormatAttr>()) 5860 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5861 "printf", 2, 5862 Name->isStr("vasprintf") ? 0 : 3)); 5863 } 5864} 5865 5866TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 5867 TypeSourceInfo *TInfo) { 5868 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 5869 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 5870 5871 if (!TInfo) { 5872 assert(D.isInvalidType() && "no declarator info for valid type"); 5873 TInfo = Context.getTrivialTypeSourceInfo(T); 5874 } 5875 5876 // Scope manipulation handled by caller. 5877 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 5878 D.getSourceRange().getBegin(), 5879 D.getIdentifierLoc(), 5880 D.getIdentifier(), 5881 TInfo); 5882 5883 // Bail out immediately if we have an invalid declaration. 5884 if (D.isInvalidType()) { 5885 NewTD->setInvalidDecl(); 5886 return NewTD; 5887 } 5888 5889 // C++ [dcl.typedef]p8: 5890 // If the typedef declaration defines an unnamed class (or 5891 // enum), the first typedef-name declared by the declaration 5892 // to be that class type (or enum type) is used to denote the 5893 // class type (or enum type) for linkage purposes only. 5894 // We need to check whether the type was declared in the declaration. 5895 switch (D.getDeclSpec().getTypeSpecType()) { 5896 case TST_enum: 5897 case TST_struct: 5898 case TST_union: 5899 case TST_class: { 5900 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 5901 5902 // Do nothing if the tag is not anonymous or already has an 5903 // associated typedef (from an earlier typedef in this decl group). 5904 if (tagFromDeclSpec->getIdentifier()) break; 5905 if (tagFromDeclSpec->getTypedefForAnonDecl()) break; 5906 5907 // A well-formed anonymous tag must always be a TUK_Definition. 5908 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 5909 5910 // The type must match the tag exactly; no qualifiers allowed. 5911 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 5912 break; 5913 5914 // Otherwise, set this is the anon-decl typedef for the tag. 5915 tagFromDeclSpec->setTypedefForAnonDecl(NewTD); 5916 break; 5917 } 5918 5919 default: 5920 break; 5921 } 5922 5923 return NewTD; 5924} 5925 5926 5927/// \brief Determine whether a tag with a given kind is acceptable 5928/// as a redeclaration of the given tag declaration. 5929/// 5930/// \returns true if the new tag kind is acceptable, false otherwise. 5931bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 5932 TagTypeKind NewTag, 5933 SourceLocation NewTagLoc, 5934 const IdentifierInfo &Name) { 5935 // C++ [dcl.type.elab]p3: 5936 // The class-key or enum keyword present in the 5937 // elaborated-type-specifier shall agree in kind with the 5938 // declaration to which the name in the elaborated-type-specifier 5939 // refers. This rule also applies to the form of 5940 // elaborated-type-specifier that declares a class-name or 5941 // friend class since it can be construed as referring to the 5942 // definition of the class. Thus, in any 5943 // elaborated-type-specifier, the enum keyword shall be used to 5944 // refer to an enumeration (7.2), the union class-key shall be 5945 // used to refer to a union (clause 9), and either the class or 5946 // struct class-key shall be used to refer to a class (clause 9) 5947 // declared using the class or struct class-key. 5948 TagTypeKind OldTag = Previous->getTagKind(); 5949 if (OldTag == NewTag) 5950 return true; 5951 5952 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 5953 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 5954 // Warn about the struct/class tag mismatch. 5955 bool isTemplate = false; 5956 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 5957 isTemplate = Record->getDescribedClassTemplate(); 5958 5959 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 5960 << (NewTag == TTK_Class) 5961 << isTemplate << &Name 5962 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 5963 OldTag == TTK_Class? "class" : "struct"); 5964 Diag(Previous->getLocation(), diag::note_previous_use); 5965 return true; 5966 } 5967 return false; 5968} 5969 5970/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 5971/// former case, Name will be non-null. In the later case, Name will be null. 5972/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 5973/// reference/declaration/definition of a tag. 5974Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 5975 SourceLocation KWLoc, CXXScopeSpec &SS, 5976 IdentifierInfo *Name, SourceLocation NameLoc, 5977 AttributeList *Attr, AccessSpecifier AS, 5978 MultiTemplateParamsArg TemplateParameterLists, 5979 bool &OwnedDecl, bool &IsDependent, 5980 bool ScopedEnum, bool ScopedEnumUsesClassTag, 5981 TypeResult UnderlyingType) { 5982 // If this is not a definition, it must have a name. 5983 assert((Name != 0 || TUK == TUK_Definition) && 5984 "Nameless record must be a definition!"); 5985 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 5986 5987 OwnedDecl = false; 5988 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 5989 5990 // FIXME: Check explicit specializations more carefully. 5991 bool isExplicitSpecialization = false; 5992 unsigned NumMatchedTemplateParamLists = TemplateParameterLists.size(); 5993 bool Invalid = false; 5994 5995 // We only need to do this matching if we have template parameters 5996 // or a scope specifier, which also conveniently avoids this work 5997 // for non-C++ cases. 5998 if (NumMatchedTemplateParamLists || 5999 (SS.isNotEmpty() && TUK != TUK_Reference)) { 6000 if (TemplateParameterList *TemplateParams 6001 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 6002 TemplateParameterLists.get(), 6003 TemplateParameterLists.size(), 6004 TUK == TUK_Friend, 6005 isExplicitSpecialization, 6006 Invalid)) { 6007 // All but one template parameter lists have been matching. 6008 --NumMatchedTemplateParamLists; 6009 6010 if (TemplateParams->size() > 0) { 6011 // This is a declaration or definition of a class template (which may 6012 // be a member of another template). 6013 if (Invalid) 6014 return 0; 6015 6016 OwnedDecl = false; 6017 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 6018 SS, Name, NameLoc, Attr, 6019 TemplateParams, 6020 AS); 6021 TemplateParameterLists.release(); 6022 return Result.get(); 6023 } else { 6024 // The "template<>" header is extraneous. 6025 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6026 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6027 isExplicitSpecialization = true; 6028 } 6029 } 6030 } 6031 6032 // Figure out the underlying type if this a enum declaration. We need to do 6033 // this early, because it's needed to detect if this is an incompatible 6034 // redeclaration. 6035 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 6036 6037 if (Kind == TTK_Enum) { 6038 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 6039 // No underlying type explicitly specified, or we failed to parse the 6040 // type, default to int. 6041 EnumUnderlying = Context.IntTy.getTypePtr(); 6042 else if (UnderlyingType.get()) { 6043 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 6044 // integral type; any cv-qualification is ignored. 6045 TypeSourceInfo *TI = 0; 6046 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 6047 EnumUnderlying = TI; 6048 6049 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 6050 6051 if (!T->isDependentType() && !T->isIntegralType(Context)) { 6052 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 6053 << T; 6054 // Recover by falling back to int. 6055 EnumUnderlying = Context.IntTy.getTypePtr(); 6056 } 6057 6058 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 6059 UPPC_FixedUnderlyingType)) 6060 EnumUnderlying = Context.IntTy.getTypePtr(); 6061 6062 } else if (getLangOptions().Microsoft) 6063 // Microsoft enums are always of int type. 6064 EnumUnderlying = Context.IntTy.getTypePtr(); 6065 } 6066 6067 DeclContext *SearchDC = CurContext; 6068 DeclContext *DC = CurContext; 6069 bool isStdBadAlloc = false; 6070 6071 RedeclarationKind Redecl = ForRedeclaration; 6072 if (TUK == TUK_Friend || TUK == TUK_Reference) 6073 Redecl = NotForRedeclaration; 6074 6075 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 6076 6077 if (Name && SS.isNotEmpty()) { 6078 // We have a nested-name tag ('struct foo::bar'). 6079 6080 // Check for invalid 'foo::'. 6081 if (SS.isInvalid()) { 6082 Name = 0; 6083 goto CreateNewDecl; 6084 } 6085 6086 // If this is a friend or a reference to a class in a dependent 6087 // context, don't try to make a decl for it. 6088 if (TUK == TUK_Friend || TUK == TUK_Reference) { 6089 DC = computeDeclContext(SS, false); 6090 if (!DC) { 6091 IsDependent = true; 6092 return 0; 6093 } 6094 } else { 6095 DC = computeDeclContext(SS, true); 6096 if (!DC) { 6097 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 6098 << SS.getRange(); 6099 return 0; 6100 } 6101 } 6102 6103 if (RequireCompleteDeclContext(SS, DC)) 6104 return 0; 6105 6106 SearchDC = DC; 6107 // Look-up name inside 'foo::'. 6108 LookupQualifiedName(Previous, DC); 6109 6110 if (Previous.isAmbiguous()) 6111 return 0; 6112 6113 if (Previous.empty()) { 6114 // Name lookup did not find anything. However, if the 6115 // nested-name-specifier refers to the current instantiation, 6116 // and that current instantiation has any dependent base 6117 // classes, we might find something at instantiation time: treat 6118 // this as a dependent elaborated-type-specifier. 6119 // But this only makes any sense for reference-like lookups. 6120 if (Previous.wasNotFoundInCurrentInstantiation() && 6121 (TUK == TUK_Reference || TUK == TUK_Friend)) { 6122 IsDependent = true; 6123 return 0; 6124 } 6125 6126 // A tag 'foo::bar' must already exist. 6127 Diag(NameLoc, diag::err_not_tag_in_scope) 6128 << Kind << Name << DC << SS.getRange(); 6129 Name = 0; 6130 Invalid = true; 6131 goto CreateNewDecl; 6132 } 6133 } else if (Name) { 6134 // If this is a named struct, check to see if there was a previous forward 6135 // declaration or definition. 6136 // FIXME: We're looking into outer scopes here, even when we 6137 // shouldn't be. Doing so can result in ambiguities that we 6138 // shouldn't be diagnosing. 6139 LookupName(Previous, S); 6140 6141 // Note: there used to be some attempt at recovery here. 6142 if (Previous.isAmbiguous()) 6143 return 0; 6144 6145 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 6146 // FIXME: This makes sure that we ignore the contexts associated 6147 // with C structs, unions, and enums when looking for a matching 6148 // tag declaration or definition. See the similar lookup tweak 6149 // in Sema::LookupName; is there a better way to deal with this? 6150 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 6151 SearchDC = SearchDC->getParent(); 6152 } 6153 } else if (S->isFunctionPrototypeScope()) { 6154 // If this is an enum declaration in function prototype scope, set its 6155 // initial context to the translation unit. 6156 SearchDC = Context.getTranslationUnitDecl(); 6157 } 6158 6159 if (Previous.isSingleResult() && 6160 Previous.getFoundDecl()->isTemplateParameter()) { 6161 // Maybe we will complain about the shadowed template parameter. 6162 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 6163 // Just pretend that we didn't see the previous declaration. 6164 Previous.clear(); 6165 } 6166 6167 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 6168 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 6169 // This is a declaration of or a reference to "std::bad_alloc". 6170 isStdBadAlloc = true; 6171 6172 if (Previous.empty() && StdBadAlloc) { 6173 // std::bad_alloc has been implicitly declared (but made invisible to 6174 // name lookup). Fill in this implicit declaration as the previous 6175 // declaration, so that the declarations get chained appropriately. 6176 Previous.addDecl(getStdBadAlloc()); 6177 } 6178 } 6179 6180 // If we didn't find a previous declaration, and this is a reference 6181 // (or friend reference), move to the correct scope. In C++, we 6182 // also need to do a redeclaration lookup there, just in case 6183 // there's a shadow friend decl. 6184 if (Name && Previous.empty() && 6185 (TUK == TUK_Reference || TUK == TUK_Friend)) { 6186 if (Invalid) goto CreateNewDecl; 6187 assert(SS.isEmpty()); 6188 6189 if (TUK == TUK_Reference) { 6190 // C++ [basic.scope.pdecl]p5: 6191 // -- for an elaborated-type-specifier of the form 6192 // 6193 // class-key identifier 6194 // 6195 // if the elaborated-type-specifier is used in the 6196 // decl-specifier-seq or parameter-declaration-clause of a 6197 // function defined in namespace scope, the identifier is 6198 // declared as a class-name in the namespace that contains 6199 // the declaration; otherwise, except as a friend 6200 // declaration, the identifier is declared in the smallest 6201 // non-class, non-function-prototype scope that contains the 6202 // declaration. 6203 // 6204 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 6205 // C structs and unions. 6206 // 6207 // It is an error in C++ to declare (rather than define) an enum 6208 // type, including via an elaborated type specifier. We'll 6209 // diagnose that later; for now, declare the enum in the same 6210 // scope as we would have picked for any other tag type. 6211 // 6212 // GNU C also supports this behavior as part of its incomplete 6213 // enum types extension, while GNU C++ does not. 6214 // 6215 // Find the context where we'll be declaring the tag. 6216 // FIXME: We would like to maintain the current DeclContext as the 6217 // lexical context, 6218 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 6219 SearchDC = SearchDC->getParent(); 6220 6221 // Find the scope where we'll be declaring the tag. 6222 while (S->isClassScope() || 6223 (getLangOptions().CPlusPlus && 6224 S->isFunctionPrototypeScope()) || 6225 ((S->getFlags() & Scope::DeclScope) == 0) || 6226 (S->getEntity() && 6227 ((DeclContext *)S->getEntity())->isTransparentContext())) 6228 S = S->getParent(); 6229 } else { 6230 assert(TUK == TUK_Friend); 6231 // C++ [namespace.memdef]p3: 6232 // If a friend declaration in a non-local class first declares a 6233 // class or function, the friend class or function is a member of 6234 // the innermost enclosing namespace. 6235 SearchDC = SearchDC->getEnclosingNamespaceContext(); 6236 } 6237 6238 // In C++, we need to do a redeclaration lookup to properly 6239 // diagnose some problems. 6240 if (getLangOptions().CPlusPlus) { 6241 Previous.setRedeclarationKind(ForRedeclaration); 6242 LookupQualifiedName(Previous, SearchDC); 6243 } 6244 } 6245 6246 if (!Previous.empty()) { 6247 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 6248 6249 // It's okay to have a tag decl in the same scope as a typedef 6250 // which hides a tag decl in the same scope. Finding this 6251 // insanity with a redeclaration lookup can only actually happen 6252 // in C++. 6253 // 6254 // This is also okay for elaborated-type-specifiers, which is 6255 // technically forbidden by the current standard but which is 6256 // okay according to the likely resolution of an open issue; 6257 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 6258 if (getLangOptions().CPlusPlus) { 6259 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(PrevDecl)) { 6260 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 6261 TagDecl *Tag = TT->getDecl(); 6262 if (Tag->getDeclName() == Name && 6263 Tag->getDeclContext()->getRedeclContext() 6264 ->Equals(TD->getDeclContext()->getRedeclContext())) { 6265 PrevDecl = Tag; 6266 Previous.clear(); 6267 Previous.addDecl(Tag); 6268 Previous.resolveKind(); 6269 } 6270 } 6271 } 6272 } 6273 6274 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 6275 // If this is a use of a previous tag, or if the tag is already declared 6276 // in the same scope (so that the definition/declaration completes or 6277 // rementions the tag), reuse the decl. 6278 if (TUK == TUK_Reference || TUK == TUK_Friend || 6279 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 6280 // Make sure that this wasn't declared as an enum and now used as a 6281 // struct or something similar. 6282 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 6283 bool SafeToContinue 6284 = (PrevTagDecl->getTagKind() != TTK_Enum && 6285 Kind != TTK_Enum); 6286 if (SafeToContinue) 6287 Diag(KWLoc, diag::err_use_with_wrong_tag) 6288 << Name 6289 << FixItHint::CreateReplacement(SourceRange(KWLoc), 6290 PrevTagDecl->getKindName()); 6291 else 6292 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 6293 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6294 6295 if (SafeToContinue) 6296 Kind = PrevTagDecl->getTagKind(); 6297 else { 6298 // Recover by making this an anonymous redefinition. 6299 Name = 0; 6300 Previous.clear(); 6301 Invalid = true; 6302 } 6303 } 6304 6305 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 6306 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 6307 6308 // All conflicts with previous declarations are recovered by 6309 // returning the previous declaration. 6310 if (ScopedEnum != PrevEnum->isScoped()) { 6311 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 6312 << PrevEnum->isScoped(); 6313 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6314 return PrevTagDecl; 6315 } 6316 else if (EnumUnderlying && PrevEnum->isFixed()) { 6317 QualType T; 6318 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 6319 T = TI->getType(); 6320 else 6321 T = QualType(EnumUnderlying.get<const Type*>(), 0); 6322 6323 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 6324 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 6325 diag::err_enum_redeclare_type_mismatch) 6326 << T 6327 << PrevEnum->getIntegerType(); 6328 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6329 return PrevTagDecl; 6330 } 6331 } 6332 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 6333 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 6334 << PrevEnum->isFixed(); 6335 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6336 return PrevTagDecl; 6337 } 6338 } 6339 6340 if (!Invalid) { 6341 // If this is a use, just return the declaration we found. 6342 6343 // FIXME: In the future, return a variant or some other clue 6344 // for the consumer of this Decl to know it doesn't own it. 6345 // For our current ASTs this shouldn't be a problem, but will 6346 // need to be changed with DeclGroups. 6347 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) || 6348 TUK == TUK_Friend) 6349 return PrevTagDecl; 6350 6351 // Diagnose attempts to redefine a tag. 6352 if (TUK == TUK_Definition) { 6353 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 6354 // If we're defining a specialization and the previous definition 6355 // is from an implicit instantiation, don't emit an error 6356 // here; we'll catch this in the general case below. 6357 if (!isExplicitSpecialization || 6358 !isa<CXXRecordDecl>(Def) || 6359 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 6360 == TSK_ExplicitSpecialization) { 6361 Diag(NameLoc, diag::err_redefinition) << Name; 6362 Diag(Def->getLocation(), diag::note_previous_definition); 6363 // If this is a redefinition, recover by making this 6364 // struct be anonymous, which will make any later 6365 // references get the previous definition. 6366 Name = 0; 6367 Previous.clear(); 6368 Invalid = true; 6369 } 6370 } else { 6371 // If the type is currently being defined, complain 6372 // about a nested redefinition. 6373 const TagType *Tag 6374 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 6375 if (Tag->isBeingDefined()) { 6376 Diag(NameLoc, diag::err_nested_redefinition) << Name; 6377 Diag(PrevTagDecl->getLocation(), 6378 diag::note_previous_definition); 6379 Name = 0; 6380 Previous.clear(); 6381 Invalid = true; 6382 } 6383 } 6384 6385 // Okay, this is definition of a previously declared or referenced 6386 // tag PrevDecl. We're going to create a new Decl for it. 6387 } 6388 } 6389 // If we get here we have (another) forward declaration or we 6390 // have a definition. Just create a new decl. 6391 6392 } else { 6393 // If we get here, this is a definition of a new tag type in a nested 6394 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 6395 // new decl/type. We set PrevDecl to NULL so that the entities 6396 // have distinct types. 6397 Previous.clear(); 6398 } 6399 // If we get here, we're going to create a new Decl. If PrevDecl 6400 // is non-NULL, it's a definition of the tag declared by 6401 // PrevDecl. If it's NULL, we have a new definition. 6402 6403 6404 // Otherwise, PrevDecl is not a tag, but was found with tag 6405 // lookup. This is only actually possible in C++, where a few 6406 // things like templates still live in the tag namespace. 6407 } else { 6408 assert(getLangOptions().CPlusPlus); 6409 6410 // Use a better diagnostic if an elaborated-type-specifier 6411 // found the wrong kind of type on the first 6412 // (non-redeclaration) lookup. 6413 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 6414 !Previous.isForRedeclaration()) { 6415 unsigned Kind = 0; 6416 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 6417 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 6418 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 6419 Diag(PrevDecl->getLocation(), diag::note_declared_at); 6420 Invalid = true; 6421 6422 // Otherwise, only diagnose if the declaration is in scope. 6423 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 6424 isExplicitSpecialization)) { 6425 // do nothing 6426 6427 // Diagnose implicit declarations introduced by elaborated types. 6428 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 6429 unsigned Kind = 0; 6430 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 6431 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 6432 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 6433 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 6434 Invalid = true; 6435 6436 // Otherwise it's a declaration. Call out a particularly common 6437 // case here. 6438 } else if (isa<TypedefDecl>(PrevDecl)) { 6439 Diag(NameLoc, diag::err_tag_definition_of_typedef) 6440 << Name 6441 << cast<TypedefDecl>(PrevDecl)->getUnderlyingType(); 6442 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 6443 Invalid = true; 6444 6445 // Otherwise, diagnose. 6446 } else { 6447 // The tag name clashes with something else in the target scope, 6448 // issue an error and recover by making this tag be anonymous. 6449 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 6450 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6451 Name = 0; 6452 Invalid = true; 6453 } 6454 6455 // The existing declaration isn't relevant to us; we're in a 6456 // new scope, so clear out the previous declaration. 6457 Previous.clear(); 6458 } 6459 } 6460 6461CreateNewDecl: 6462 6463 TagDecl *PrevDecl = 0; 6464 if (Previous.isSingleResult()) 6465 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 6466 6467 // If there is an identifier, use the location of the identifier as the 6468 // location of the decl, otherwise use the location of the struct/union 6469 // keyword. 6470 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 6471 6472 // Otherwise, create a new declaration. If there is a previous 6473 // declaration of the same entity, the two will be linked via 6474 // PrevDecl. 6475 TagDecl *New; 6476 6477 bool IsForwardReference = false; 6478 if (Kind == TTK_Enum) { 6479 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 6480 // enum X { A, B, C } D; D should chain to X. 6481 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 6482 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 6483 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 6484 // If this is an undefined enum, warn. 6485 if (TUK != TUK_Definition && !Invalid) { 6486 TagDecl *Def; 6487 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 6488 // C++0x: 7.2p2: opaque-enum-declaration. 6489 // Conflicts are diagnosed above. Do nothing. 6490 } 6491 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 6492 Diag(Loc, diag::ext_forward_ref_enum_def) 6493 << New; 6494 Diag(Def->getLocation(), diag::note_previous_definition); 6495 } else { 6496 unsigned DiagID = diag::ext_forward_ref_enum; 6497 if (getLangOptions().Microsoft) 6498 DiagID = diag::ext_ms_forward_ref_enum; 6499 else if (getLangOptions().CPlusPlus) 6500 DiagID = diag::err_forward_ref_enum; 6501 Diag(Loc, DiagID); 6502 6503 // If this is a forward-declared reference to an enumeration, make a 6504 // note of it; we won't actually be introducing the declaration into 6505 // the declaration context. 6506 if (TUK == TUK_Reference) 6507 IsForwardReference = true; 6508 } 6509 } 6510 6511 if (EnumUnderlying) { 6512 EnumDecl *ED = cast<EnumDecl>(New); 6513 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 6514 ED->setIntegerTypeSourceInfo(TI); 6515 else 6516 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 6517 ED->setPromotionType(ED->getIntegerType()); 6518 } 6519 6520 } else { 6521 // struct/union/class 6522 6523 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 6524 // struct X { int A; } D; D should chain to X. 6525 if (getLangOptions().CPlusPlus) { 6526 // FIXME: Look for a way to use RecordDecl for simple structs. 6527 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 6528 cast_or_null<CXXRecordDecl>(PrevDecl)); 6529 6530 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 6531 StdBadAlloc = cast<CXXRecordDecl>(New); 6532 } else 6533 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 6534 cast_or_null<RecordDecl>(PrevDecl)); 6535 } 6536 6537 // Maybe add qualifier info. 6538 if (SS.isNotEmpty()) { 6539 if (SS.isSet()) { 6540 New->setQualifierInfo(SS.getWithLocInContext(Context)); 6541 if (NumMatchedTemplateParamLists > 0) { 6542 New->setTemplateParameterListsInfo(Context, 6543 NumMatchedTemplateParamLists, 6544 (TemplateParameterList**) TemplateParameterLists.release()); 6545 } 6546 } 6547 else 6548 Invalid = true; 6549 } 6550 6551 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 6552 // Add alignment attributes if necessary; these attributes are checked when 6553 // the ASTContext lays out the structure. 6554 // 6555 // It is important for implementing the correct semantics that this 6556 // happen here (in act on tag decl). The #pragma pack stack is 6557 // maintained as a result of parser callbacks which can occur at 6558 // many points during the parsing of a struct declaration (because 6559 // the #pragma tokens are effectively skipped over during the 6560 // parsing of the struct). 6561 AddAlignmentAttributesForRecord(RD); 6562 } 6563 6564 // If this is a specialization of a member class (of a class template), 6565 // check the specialization. 6566 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 6567 Invalid = true; 6568 6569 if (Invalid) 6570 New->setInvalidDecl(); 6571 6572 if (Attr) 6573 ProcessDeclAttributeList(S, New, Attr); 6574 6575 // If we're declaring or defining a tag in function prototype scope 6576 // in C, note that this type can only be used within the function. 6577 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 6578 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 6579 6580 // Set the lexical context. If the tag has a C++ scope specifier, the 6581 // lexical context will be different from the semantic context. 6582 New->setLexicalDeclContext(CurContext); 6583 6584 // Mark this as a friend decl if applicable. 6585 if (TUK == TUK_Friend) 6586 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 6587 6588 // Set the access specifier. 6589 if (!Invalid && SearchDC->isRecord()) 6590 SetMemberAccessSpecifier(New, PrevDecl, AS); 6591 6592 if (TUK == TUK_Definition) 6593 New->startDefinition(); 6594 6595 // If this has an identifier, add it to the scope stack. 6596 if (TUK == TUK_Friend) { 6597 // We might be replacing an existing declaration in the lookup tables; 6598 // if so, borrow its access specifier. 6599 if (PrevDecl) 6600 New->setAccess(PrevDecl->getAccess()); 6601 6602 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 6603 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 6604 if (Name) // can be null along some error paths 6605 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 6606 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 6607 } else if (Name) { 6608 S = getNonFieldDeclScope(S); 6609 PushOnScopeChains(New, S, !IsForwardReference); 6610 if (IsForwardReference) 6611 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 6612 6613 } else { 6614 CurContext->addDecl(New); 6615 } 6616 6617 // If this is the C FILE type, notify the AST context. 6618 if (IdentifierInfo *II = New->getIdentifier()) 6619 if (!New->isInvalidDecl() && 6620 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 6621 II->isStr("FILE")) 6622 Context.setFILEDecl(New); 6623 6624 OwnedDecl = true; 6625 return New; 6626} 6627 6628void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 6629 AdjustDeclIfTemplate(TagD); 6630 TagDecl *Tag = cast<TagDecl>(TagD); 6631 6632 // Enter the tag context. 6633 PushDeclContext(S, Tag); 6634} 6635 6636void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 6637 ClassVirtSpecifiers &CVS, 6638 SourceLocation LBraceLoc) { 6639 AdjustDeclIfTemplate(TagD); 6640 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 6641 6642 FieldCollector->StartClass(); 6643 6644 if (!Record->getIdentifier()) 6645 return; 6646 6647 if (CVS.isFinalSpecified()) 6648 Record->addAttr(new (Context) FinalAttr(CVS.getFinalLoc(), Context)); 6649 if (CVS.isExplicitSpecified()) 6650 Record->addAttr(new (Context) ExplicitAttr(CVS.getExplicitLoc(), Context)); 6651 6652 // C++ [class]p2: 6653 // [...] The class-name is also inserted into the scope of the 6654 // class itself; this is known as the injected-class-name. For 6655 // purposes of access checking, the injected-class-name is treated 6656 // as if it were a public member name. 6657 CXXRecordDecl *InjectedClassName 6658 = CXXRecordDecl::Create(Context, Record->getTagKind(), 6659 CurContext, Record->getLocation(), 6660 Record->getIdentifier(), 6661 Record->getLocStart(), 6662 /*PrevDecl=*/0, 6663 /*DelayTypeCreation=*/true); 6664 Context.getTypeDeclType(InjectedClassName, Record); 6665 InjectedClassName->setImplicit(); 6666 InjectedClassName->setAccess(AS_public); 6667 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 6668 InjectedClassName->setDescribedClassTemplate(Template); 6669 PushOnScopeChains(InjectedClassName, S); 6670 assert(InjectedClassName->isInjectedClassName() && 6671 "Broken injected-class-name"); 6672} 6673 6674void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 6675 SourceLocation RBraceLoc) { 6676 AdjustDeclIfTemplate(TagD); 6677 TagDecl *Tag = cast<TagDecl>(TagD); 6678 Tag->setRBraceLoc(RBraceLoc); 6679 6680 if (isa<CXXRecordDecl>(Tag)) 6681 FieldCollector->FinishClass(); 6682 6683 // Exit this scope of this tag's definition. 6684 PopDeclContext(); 6685 6686 // Notify the consumer that we've defined a tag. 6687 Consumer.HandleTagDeclDefinition(Tag); 6688} 6689 6690void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 6691 AdjustDeclIfTemplate(TagD); 6692 TagDecl *Tag = cast<TagDecl>(TagD); 6693 Tag->setInvalidDecl(); 6694 6695 // We're undoing ActOnTagStartDefinition here, not 6696 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 6697 // the FieldCollector. 6698 6699 PopDeclContext(); 6700} 6701 6702// Note that FieldName may be null for anonymous bitfields. 6703bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 6704 QualType FieldTy, const Expr *BitWidth, 6705 bool *ZeroWidth) { 6706 // Default to true; that shouldn't confuse checks for emptiness 6707 if (ZeroWidth) 6708 *ZeroWidth = true; 6709 6710 // C99 6.7.2.1p4 - verify the field type. 6711 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 6712 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 6713 // Handle incomplete types with specific error. 6714 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 6715 return true; 6716 if (FieldName) 6717 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 6718 << FieldName << FieldTy << BitWidth->getSourceRange(); 6719 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 6720 << FieldTy << BitWidth->getSourceRange(); 6721 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 6722 UPPC_BitFieldWidth)) 6723 return true; 6724 6725 // If the bit-width is type- or value-dependent, don't try to check 6726 // it now. 6727 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 6728 return false; 6729 6730 llvm::APSInt Value; 6731 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 6732 return true; 6733 6734 if (Value != 0 && ZeroWidth) 6735 *ZeroWidth = false; 6736 6737 // Zero-width bitfield is ok for anonymous field. 6738 if (Value == 0 && FieldName) 6739 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 6740 6741 if (Value.isSigned() && Value.isNegative()) { 6742 if (FieldName) 6743 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 6744 << FieldName << Value.toString(10); 6745 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 6746 << Value.toString(10); 6747 } 6748 6749 if (!FieldTy->isDependentType()) { 6750 uint64_t TypeSize = Context.getTypeSize(FieldTy); 6751 if (Value.getZExtValue() > TypeSize) { 6752 if (!getLangOptions().CPlusPlus) { 6753 if (FieldName) 6754 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 6755 << FieldName << (unsigned)Value.getZExtValue() 6756 << (unsigned)TypeSize; 6757 6758 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 6759 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 6760 } 6761 6762 if (FieldName) 6763 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 6764 << FieldName << (unsigned)Value.getZExtValue() 6765 << (unsigned)TypeSize; 6766 else 6767 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 6768 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 6769 } 6770 } 6771 6772 return false; 6773} 6774 6775/// ActOnField - Each field of a struct/union/class is passed into this in order 6776/// to create a FieldDecl object for it. 6777Decl *Sema::ActOnField(Scope *S, Decl *TagD, 6778 SourceLocation DeclStart, 6779 Declarator &D, ExprTy *BitfieldWidth) { 6780 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 6781 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 6782 AS_public); 6783 return Res; 6784} 6785 6786/// HandleField - Analyze a field of a C struct or a C++ data member. 6787/// 6788FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 6789 SourceLocation DeclStart, 6790 Declarator &D, Expr *BitWidth, 6791 AccessSpecifier AS) { 6792 IdentifierInfo *II = D.getIdentifier(); 6793 SourceLocation Loc = DeclStart; 6794 if (II) Loc = D.getIdentifierLoc(); 6795 6796 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6797 QualType T = TInfo->getType(); 6798 if (getLangOptions().CPlusPlus) { 6799 CheckExtraCXXDefaultArguments(D); 6800 6801 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 6802 UPPC_DataMemberType)) { 6803 D.setInvalidType(); 6804 T = Context.IntTy; 6805 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 6806 } 6807 } 6808 6809 DiagnoseFunctionSpecifiers(D); 6810 6811 if (D.getDeclSpec().isThreadSpecified()) 6812 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6813 6814 // Check to see if this name was declared as a member previously 6815 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 6816 LookupName(Previous, S); 6817 assert((Previous.empty() || Previous.isOverloadedResult() || 6818 Previous.isSingleResult()) 6819 && "Lookup of member name should be either overloaded, single or null"); 6820 6821 // If the name is overloaded then get any declaration else get the single result 6822 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 6823 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 6824 6825 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6826 // Maybe we will complain about the shadowed template parameter. 6827 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6828 // Just pretend that we didn't see the previous declaration. 6829 PrevDecl = 0; 6830 } 6831 6832 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 6833 PrevDecl = 0; 6834 6835 bool Mutable 6836 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 6837 SourceLocation TSSL = D.getSourceRange().getBegin(); 6838 FieldDecl *NewFD 6839 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 6840 AS, PrevDecl, &D); 6841 6842 if (NewFD->isInvalidDecl()) 6843 Record->setInvalidDecl(); 6844 6845 if (NewFD->isInvalidDecl() && PrevDecl) { 6846 // Don't introduce NewFD into scope; there's already something 6847 // with the same name in the same scope. 6848 } else if (II) { 6849 PushOnScopeChains(NewFD, S); 6850 } else 6851 Record->addDecl(NewFD); 6852 6853 return NewFD; 6854} 6855 6856/// \brief Build a new FieldDecl and check its well-formedness. 6857/// 6858/// This routine builds a new FieldDecl given the fields name, type, 6859/// record, etc. \p PrevDecl should refer to any previous declaration 6860/// with the same name and in the same scope as the field to be 6861/// created. 6862/// 6863/// \returns a new FieldDecl. 6864/// 6865/// \todo The Declarator argument is a hack. It will be removed once 6866FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 6867 TypeSourceInfo *TInfo, 6868 RecordDecl *Record, SourceLocation Loc, 6869 bool Mutable, Expr *BitWidth, 6870 SourceLocation TSSL, 6871 AccessSpecifier AS, NamedDecl *PrevDecl, 6872 Declarator *D) { 6873 IdentifierInfo *II = Name.getAsIdentifierInfo(); 6874 bool InvalidDecl = false; 6875 if (D) InvalidDecl = D->isInvalidType(); 6876 6877 // If we receive a broken type, recover by assuming 'int' and 6878 // marking this declaration as invalid. 6879 if (T.isNull()) { 6880 InvalidDecl = true; 6881 T = Context.IntTy; 6882 } 6883 6884 QualType EltTy = Context.getBaseElementType(T); 6885 if (!EltTy->isDependentType() && 6886 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 6887 // Fields of incomplete type force their record to be invalid. 6888 Record->setInvalidDecl(); 6889 InvalidDecl = true; 6890 } 6891 6892 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6893 // than a variably modified type. 6894 if (!InvalidDecl && T->isVariablyModifiedType()) { 6895 bool SizeIsNegative; 6896 llvm::APSInt Oversized; 6897 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 6898 SizeIsNegative, 6899 Oversized); 6900 if (!FixedTy.isNull()) { 6901 Diag(Loc, diag::warn_illegal_constant_array_size); 6902 T = FixedTy; 6903 } else { 6904 if (SizeIsNegative) 6905 Diag(Loc, diag::err_typecheck_negative_array_size); 6906 else if (Oversized.getBoolValue()) 6907 Diag(Loc, diag::err_array_too_large) 6908 << Oversized.toString(10); 6909 else 6910 Diag(Loc, diag::err_typecheck_field_variable_size); 6911 InvalidDecl = true; 6912 } 6913 } 6914 6915 // Fields can not have abstract class types 6916 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 6917 diag::err_abstract_type_in_decl, 6918 AbstractFieldType)) 6919 InvalidDecl = true; 6920 6921 bool ZeroWidth = false; 6922 // If this is declared as a bit-field, check the bit-field. 6923 if (!InvalidDecl && BitWidth && 6924 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 6925 InvalidDecl = true; 6926 BitWidth = 0; 6927 ZeroWidth = false; 6928 } 6929 6930 // Check that 'mutable' is consistent with the type of the declaration. 6931 if (!InvalidDecl && Mutable) { 6932 unsigned DiagID = 0; 6933 if (T->isReferenceType()) 6934 DiagID = diag::err_mutable_reference; 6935 else if (T.isConstQualified()) 6936 DiagID = diag::err_mutable_const; 6937 6938 if (DiagID) { 6939 SourceLocation ErrLoc = Loc; 6940 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 6941 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 6942 Diag(ErrLoc, DiagID); 6943 Mutable = false; 6944 InvalidDecl = true; 6945 } 6946 } 6947 6948 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 6949 BitWidth, Mutable); 6950 if (InvalidDecl) 6951 NewFD->setInvalidDecl(); 6952 6953 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 6954 Diag(Loc, diag::err_duplicate_member) << II; 6955 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6956 NewFD->setInvalidDecl(); 6957 } 6958 6959 if (!InvalidDecl && getLangOptions().CPlusPlus) { 6960 if (Record->isUnion()) { 6961 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6962 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6963 if (RDecl->getDefinition()) { 6964 // C++ [class.union]p1: An object of a class with a non-trivial 6965 // constructor, a non-trivial copy constructor, a non-trivial 6966 // destructor, or a non-trivial copy assignment operator 6967 // cannot be a member of a union, nor can an array of such 6968 // objects. 6969 // TODO: C++0x alters this restriction significantly. 6970 if (CheckNontrivialField(NewFD)) 6971 NewFD->setInvalidDecl(); 6972 } 6973 } 6974 6975 // C++ [class.union]p1: If a union contains a member of reference type, 6976 // the program is ill-formed. 6977 if (EltTy->isReferenceType()) { 6978 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 6979 << NewFD->getDeclName() << EltTy; 6980 NewFD->setInvalidDecl(); 6981 } 6982 } 6983 } 6984 6985 // FIXME: We need to pass in the attributes given an AST 6986 // representation, not a parser representation. 6987 if (D) 6988 // FIXME: What to pass instead of TUScope? 6989 ProcessDeclAttributes(TUScope, NewFD, *D); 6990 6991 if (T.isObjCGCWeak()) 6992 Diag(Loc, diag::warn_attribute_weak_on_field); 6993 6994 NewFD->setAccess(AS); 6995 return NewFD; 6996} 6997 6998bool Sema::CheckNontrivialField(FieldDecl *FD) { 6999 assert(FD); 7000 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 7001 7002 if (FD->isInvalidDecl()) 7003 return true; 7004 7005 QualType EltTy = Context.getBaseElementType(FD->getType()); 7006 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 7007 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 7008 if (RDecl->getDefinition()) { 7009 // We check for copy constructors before constructors 7010 // because otherwise we'll never get complaints about 7011 // copy constructors. 7012 7013 CXXSpecialMember member = CXXInvalid; 7014 if (!RDecl->hasTrivialCopyConstructor()) 7015 member = CXXCopyConstructor; 7016 else if (!RDecl->hasTrivialConstructor()) 7017 member = CXXConstructor; 7018 else if (!RDecl->hasTrivialCopyAssignment()) 7019 member = CXXCopyAssignment; 7020 else if (!RDecl->hasTrivialDestructor()) 7021 member = CXXDestructor; 7022 7023 if (member != CXXInvalid) { 7024 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 7025 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 7026 DiagnoseNontrivial(RT, member); 7027 return true; 7028 } 7029 } 7030 } 7031 7032 return false; 7033} 7034 7035/// DiagnoseNontrivial - Given that a class has a non-trivial 7036/// special member, figure out why. 7037void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 7038 QualType QT(T, 0U); 7039 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 7040 7041 // Check whether the member was user-declared. 7042 switch (member) { 7043 case CXXInvalid: 7044 break; 7045 7046 case CXXConstructor: 7047 if (RD->hasUserDeclaredConstructor()) { 7048 typedef CXXRecordDecl::ctor_iterator ctor_iter; 7049 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 7050 const FunctionDecl *body = 0; 7051 ci->hasBody(body); 7052 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 7053 SourceLocation CtorLoc = ci->getLocation(); 7054 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7055 return; 7056 } 7057 } 7058 7059 assert(0 && "found no user-declared constructors"); 7060 return; 7061 } 7062 break; 7063 7064 case CXXCopyConstructor: 7065 if (RD->hasUserDeclaredCopyConstructor()) { 7066 SourceLocation CtorLoc = 7067 RD->getCopyConstructor(Context, 0)->getLocation(); 7068 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7069 return; 7070 } 7071 break; 7072 7073 case CXXCopyAssignment: 7074 if (RD->hasUserDeclaredCopyAssignment()) { 7075 // FIXME: this should use the location of the copy 7076 // assignment, not the type. 7077 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 7078 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 7079 return; 7080 } 7081 break; 7082 7083 case CXXDestructor: 7084 if (RD->hasUserDeclaredDestructor()) { 7085 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 7086 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7087 return; 7088 } 7089 break; 7090 } 7091 7092 typedef CXXRecordDecl::base_class_iterator base_iter; 7093 7094 // Virtual bases and members inhibit trivial copying/construction, 7095 // but not trivial destruction. 7096 if (member != CXXDestructor) { 7097 // Check for virtual bases. vbases includes indirect virtual bases, 7098 // so we just iterate through the direct bases. 7099 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 7100 if (bi->isVirtual()) { 7101 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 7102 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 7103 return; 7104 } 7105 7106 // Check for virtual methods. 7107 typedef CXXRecordDecl::method_iterator meth_iter; 7108 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 7109 ++mi) { 7110 if (mi->isVirtual()) { 7111 SourceLocation MLoc = mi->getSourceRange().getBegin(); 7112 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 7113 return; 7114 } 7115 } 7116 } 7117 7118 bool (CXXRecordDecl::*hasTrivial)() const; 7119 switch (member) { 7120 case CXXConstructor: 7121 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 7122 case CXXCopyConstructor: 7123 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 7124 case CXXCopyAssignment: 7125 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 7126 case CXXDestructor: 7127 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 7128 default: 7129 assert(0 && "unexpected special member"); return; 7130 } 7131 7132 // Check for nontrivial bases (and recurse). 7133 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 7134 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 7135 assert(BaseRT && "Don't know how to handle dependent bases"); 7136 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 7137 if (!(BaseRecTy->*hasTrivial)()) { 7138 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 7139 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 7140 DiagnoseNontrivial(BaseRT, member); 7141 return; 7142 } 7143 } 7144 7145 // Check for nontrivial members (and recurse). 7146 typedef RecordDecl::field_iterator field_iter; 7147 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 7148 ++fi) { 7149 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 7150 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 7151 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 7152 7153 if (!(EltRD->*hasTrivial)()) { 7154 SourceLocation FLoc = (*fi)->getLocation(); 7155 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 7156 DiagnoseNontrivial(EltRT, member); 7157 return; 7158 } 7159 } 7160 } 7161 7162 assert(0 && "found no explanation for non-trivial member"); 7163} 7164 7165/// TranslateIvarVisibility - Translate visibility from a token ID to an 7166/// AST enum value. 7167static ObjCIvarDecl::AccessControl 7168TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 7169 switch (ivarVisibility) { 7170 default: assert(0 && "Unknown visitibility kind"); 7171 case tok::objc_private: return ObjCIvarDecl::Private; 7172 case tok::objc_public: return ObjCIvarDecl::Public; 7173 case tok::objc_protected: return ObjCIvarDecl::Protected; 7174 case tok::objc_package: return ObjCIvarDecl::Package; 7175 } 7176} 7177 7178/// ActOnIvar - Each ivar field of an objective-c class is passed into this 7179/// in order to create an IvarDecl object for it. 7180Decl *Sema::ActOnIvar(Scope *S, 7181 SourceLocation DeclStart, 7182 Decl *IntfDecl, 7183 Declarator &D, ExprTy *BitfieldWidth, 7184 tok::ObjCKeywordKind Visibility) { 7185 7186 IdentifierInfo *II = D.getIdentifier(); 7187 Expr *BitWidth = (Expr*)BitfieldWidth; 7188 SourceLocation Loc = DeclStart; 7189 if (II) Loc = D.getIdentifierLoc(); 7190 7191 // FIXME: Unnamed fields can be handled in various different ways, for 7192 // example, unnamed unions inject all members into the struct namespace! 7193 7194 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7195 QualType T = TInfo->getType(); 7196 7197 if (BitWidth) { 7198 // 6.7.2.1p3, 6.7.2.1p4 7199 if (VerifyBitField(Loc, II, T, BitWidth)) { 7200 D.setInvalidType(); 7201 BitWidth = 0; 7202 } 7203 } else { 7204 // Not a bitfield. 7205 7206 // validate II. 7207 7208 } 7209 if (T->isReferenceType()) { 7210 Diag(Loc, diag::err_ivar_reference_type); 7211 D.setInvalidType(); 7212 } 7213 // C99 6.7.2.1p8: A member of a structure or union may have any type other 7214 // than a variably modified type. 7215 else if (T->isVariablyModifiedType()) { 7216 Diag(Loc, diag::err_typecheck_ivar_variable_size); 7217 D.setInvalidType(); 7218 } 7219 7220 // Get the visibility (access control) for this ivar. 7221 ObjCIvarDecl::AccessControl ac = 7222 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 7223 : ObjCIvarDecl::None; 7224 // Must set ivar's DeclContext to its enclosing interface. 7225 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(IntfDecl); 7226 ObjCContainerDecl *EnclosingContext; 7227 if (ObjCImplementationDecl *IMPDecl = 7228 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 7229 if (!LangOpts.ObjCNonFragileABI2) { 7230 // Case of ivar declared in an implementation. Context is that of its class. 7231 EnclosingContext = IMPDecl->getClassInterface(); 7232 assert(EnclosingContext && "Implementation has no class interface!"); 7233 } 7234 else 7235 EnclosingContext = EnclosingDecl; 7236 } else { 7237 if (ObjCCategoryDecl *CDecl = 7238 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7239 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 7240 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 7241 return 0; 7242 } 7243 } 7244 EnclosingContext = EnclosingDecl; 7245 } 7246 7247 // Construct the decl. 7248 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 7249 EnclosingContext, Loc, II, T, 7250 TInfo, ac, (Expr *)BitfieldWidth); 7251 7252 if (II) { 7253 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 7254 ForRedeclaration); 7255 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 7256 && !isa<TagDecl>(PrevDecl)) { 7257 Diag(Loc, diag::err_duplicate_member) << II; 7258 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7259 NewID->setInvalidDecl(); 7260 } 7261 } 7262 7263 // Process attributes attached to the ivar. 7264 ProcessDeclAttributes(S, NewID, D); 7265 7266 if (D.isInvalidType()) 7267 NewID->setInvalidDecl(); 7268 7269 if (II) { 7270 // FIXME: When interfaces are DeclContexts, we'll need to add 7271 // these to the interface. 7272 S->AddDecl(NewID); 7273 IdResolver.AddDecl(NewID); 7274 } 7275 7276 return NewID; 7277} 7278 7279/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 7280/// class and class extensions. For every class @interface and class 7281/// extension @interface, if the last ivar is a bitfield of any type, 7282/// then add an implicit `char :0` ivar to the end of that interface. 7283void Sema::ActOnLastBitfield(SourceLocation DeclLoc, Decl *EnclosingDecl, 7284 llvm::SmallVectorImpl<Decl *> &AllIvarDecls) { 7285 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 7286 return; 7287 7288 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 7289 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 7290 7291 if (!Ivar->isBitField()) 7292 return; 7293 uint64_t BitFieldSize = 7294 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 7295 if (BitFieldSize == 0) 7296 return; 7297 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl); 7298 if (!ID) { 7299 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7300 if (!CD->IsClassExtension()) 7301 return; 7302 } 7303 // No need to add this to end of @implementation. 7304 else 7305 return; 7306 } 7307 // All conditions are met. Add a new bitfield to the tail end of ivars. 7308 llvm::APInt Zero(Context.getTypeSize(Context.CharTy), 0); 7309 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.CharTy, DeclLoc); 7310 7311 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(EnclosingDecl), 7312 DeclLoc, 0, 7313 Context.CharTy, 7314 Context.CreateTypeSourceInfo(Context.CharTy), 7315 ObjCIvarDecl::Private, BW, 7316 true); 7317 AllIvarDecls.push_back(Ivar); 7318} 7319 7320void Sema::ActOnFields(Scope* S, 7321 SourceLocation RecLoc, Decl *EnclosingDecl, 7322 Decl **Fields, unsigned NumFields, 7323 SourceLocation LBrac, SourceLocation RBrac, 7324 AttributeList *Attr) { 7325 assert(EnclosingDecl && "missing record or interface decl"); 7326 7327 // If the decl this is being inserted into is invalid, then it may be a 7328 // redeclaration or some other bogus case. Don't try to add fields to it. 7329 if (EnclosingDecl->isInvalidDecl()) { 7330 // FIXME: Deallocate fields? 7331 return; 7332 } 7333 7334 7335 // Verify that all the fields are okay. 7336 unsigned NumNamedMembers = 0; 7337 llvm::SmallVector<FieldDecl*, 32> RecFields; 7338 7339 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 7340 for (unsigned i = 0; i != NumFields; ++i) { 7341 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 7342 7343 // Get the type for the field. 7344 const Type *FDTy = FD->getType().getTypePtr(); 7345 7346 if (!FD->isAnonymousStructOrUnion()) { 7347 // Remember all fields written by the user. 7348 RecFields.push_back(FD); 7349 } 7350 7351 // If the field is already invalid for some reason, don't emit more 7352 // diagnostics about it. 7353 if (FD->isInvalidDecl()) { 7354 EnclosingDecl->setInvalidDecl(); 7355 continue; 7356 } 7357 7358 // C99 6.7.2.1p2: 7359 // A structure or union shall not contain a member with 7360 // incomplete or function type (hence, a structure shall not 7361 // contain an instance of itself, but may contain a pointer to 7362 // an instance of itself), except that the last member of a 7363 // structure with more than one named member may have incomplete 7364 // array type; such a structure (and any union containing, 7365 // possibly recursively, a member that is such a structure) 7366 // shall not be a member of a structure or an element of an 7367 // array. 7368 if (FDTy->isFunctionType()) { 7369 // Field declared as a function. 7370 Diag(FD->getLocation(), diag::err_field_declared_as_function) 7371 << FD->getDeclName(); 7372 FD->setInvalidDecl(); 7373 EnclosingDecl->setInvalidDecl(); 7374 continue; 7375 } else if (FDTy->isIncompleteArrayType() && Record && 7376 ((i == NumFields - 1 && !Record->isUnion()) || 7377 ((getLangOptions().Microsoft || getLangOptions().CPlusPlus) && 7378 (i == NumFields - 1 || Record->isUnion())))) { 7379 // Flexible array member. 7380 // Microsoft and g++ is more permissive regarding flexible array. 7381 // It will accept flexible array in union and also 7382 // as the sole element of a struct/class. 7383 if (getLangOptions().Microsoft) { 7384 if (Record->isUnion()) 7385 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 7386 << FD->getDeclName(); 7387 else if (NumFields == 1) 7388 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 7389 << FD->getDeclName() << Record->getTagKind(); 7390 } else if (getLangOptions().CPlusPlus) { 7391 if (Record->isUnion()) 7392 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 7393 << FD->getDeclName(); 7394 else if (NumFields == 1) 7395 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 7396 << FD->getDeclName() << Record->getTagKind(); 7397 } else if (NumNamedMembers < 1) { 7398 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 7399 << FD->getDeclName(); 7400 FD->setInvalidDecl(); 7401 EnclosingDecl->setInvalidDecl(); 7402 continue; 7403 } 7404 if (!FD->getType()->isDependentType() && 7405 !Context.getBaseElementType(FD->getType())->isPODType()) { 7406 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 7407 << FD->getDeclName() << FD->getType(); 7408 FD->setInvalidDecl(); 7409 EnclosingDecl->setInvalidDecl(); 7410 continue; 7411 } 7412 // Okay, we have a legal flexible array member at the end of the struct. 7413 if (Record) 7414 Record->setHasFlexibleArrayMember(true); 7415 } else if (!FDTy->isDependentType() && 7416 RequireCompleteType(FD->getLocation(), FD->getType(), 7417 diag::err_field_incomplete)) { 7418 // Incomplete type 7419 FD->setInvalidDecl(); 7420 EnclosingDecl->setInvalidDecl(); 7421 continue; 7422 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 7423 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 7424 // If this is a member of a union, then entire union becomes "flexible". 7425 if (Record && Record->isUnion()) { 7426 Record->setHasFlexibleArrayMember(true); 7427 } else { 7428 // If this is a struct/class and this is not the last element, reject 7429 // it. Note that GCC supports variable sized arrays in the middle of 7430 // structures. 7431 if (i != NumFields-1) 7432 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 7433 << FD->getDeclName() << FD->getType(); 7434 else { 7435 // We support flexible arrays at the end of structs in 7436 // other structs as an extension. 7437 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 7438 << FD->getDeclName(); 7439 if (Record) 7440 Record->setHasFlexibleArrayMember(true); 7441 } 7442 } 7443 } 7444 if (Record && FDTTy->getDecl()->hasObjectMember()) 7445 Record->setHasObjectMember(true); 7446 } else if (FDTy->isObjCObjectType()) { 7447 /// A field cannot be an Objective-c object 7448 Diag(FD->getLocation(), diag::err_statically_allocated_object); 7449 FD->setInvalidDecl(); 7450 EnclosingDecl->setInvalidDecl(); 7451 continue; 7452 } else if (getLangOptions().ObjC1 && 7453 getLangOptions().getGCMode() != LangOptions::NonGC && 7454 Record && 7455 (FD->getType()->isObjCObjectPointerType() || 7456 FD->getType().isObjCGCStrong())) 7457 Record->setHasObjectMember(true); 7458 else if (Context.getAsArrayType(FD->getType())) { 7459 QualType BaseType = Context.getBaseElementType(FD->getType()); 7460 if (Record && BaseType->isRecordType() && 7461 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 7462 Record->setHasObjectMember(true); 7463 } 7464 // Keep track of the number of named members. 7465 if (FD->getIdentifier()) 7466 ++NumNamedMembers; 7467 } 7468 7469 // Okay, we successfully defined 'Record'. 7470 if (Record) { 7471 bool Completed = false; 7472 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 7473 if (!CXXRecord->isInvalidDecl()) { 7474 // Set access bits correctly on the directly-declared conversions. 7475 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 7476 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 7477 I != E; ++I) 7478 Convs->setAccess(I, (*I)->getAccess()); 7479 7480 if (!CXXRecord->isDependentType()) { 7481 // Add any implicitly-declared members to this class. 7482 AddImplicitlyDeclaredMembersToClass(CXXRecord); 7483 7484 // If we have virtual base classes, we may end up finding multiple 7485 // final overriders for a given virtual function. Check for this 7486 // problem now. 7487 if (CXXRecord->getNumVBases()) { 7488 CXXFinalOverriderMap FinalOverriders; 7489 CXXRecord->getFinalOverriders(FinalOverriders); 7490 7491 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 7492 MEnd = FinalOverriders.end(); 7493 M != MEnd; ++M) { 7494 for (OverridingMethods::iterator SO = M->second.begin(), 7495 SOEnd = M->second.end(); 7496 SO != SOEnd; ++SO) { 7497 assert(SO->second.size() > 0 && 7498 "Virtual function without overridding functions?"); 7499 if (SO->second.size() == 1) 7500 continue; 7501 7502 // C++ [class.virtual]p2: 7503 // In a derived class, if a virtual member function of a base 7504 // class subobject has more than one final overrider the 7505 // program is ill-formed. 7506 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 7507 << (NamedDecl *)M->first << Record; 7508 Diag(M->first->getLocation(), 7509 diag::note_overridden_virtual_function); 7510 for (OverridingMethods::overriding_iterator 7511 OM = SO->second.begin(), 7512 OMEnd = SO->second.end(); 7513 OM != OMEnd; ++OM) 7514 Diag(OM->Method->getLocation(), diag::note_final_overrider) 7515 << (NamedDecl *)M->first << OM->Method->getParent(); 7516 7517 Record->setInvalidDecl(); 7518 } 7519 } 7520 CXXRecord->completeDefinition(&FinalOverriders); 7521 Completed = true; 7522 } 7523 } 7524 } 7525 } 7526 7527 if (!Completed) 7528 Record->completeDefinition(); 7529 } else { 7530 ObjCIvarDecl **ClsFields = 7531 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 7532 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 7533 ID->setLocEnd(RBrac); 7534 // Add ivar's to class's DeclContext. 7535 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 7536 ClsFields[i]->setLexicalDeclContext(ID); 7537 ID->addDecl(ClsFields[i]); 7538 } 7539 // Must enforce the rule that ivars in the base classes may not be 7540 // duplicates. 7541 if (ID->getSuperClass()) 7542 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 7543 } else if (ObjCImplementationDecl *IMPDecl = 7544 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 7545 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 7546 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 7547 // Ivar declared in @implementation never belongs to the implementation. 7548 // Only it is in implementation's lexical context. 7549 ClsFields[I]->setLexicalDeclContext(IMPDecl); 7550 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 7551 } else if (ObjCCategoryDecl *CDecl = 7552 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7553 // case of ivars in class extension; all other cases have been 7554 // reported as errors elsewhere. 7555 // FIXME. Class extension does not have a LocEnd field. 7556 // CDecl->setLocEnd(RBrac); 7557 // Add ivar's to class extension's DeclContext. 7558 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 7559 ClsFields[i]->setLexicalDeclContext(CDecl); 7560 CDecl->addDecl(ClsFields[i]); 7561 } 7562 } 7563 } 7564 7565 if (Attr) 7566 ProcessDeclAttributeList(S, Record, Attr); 7567 7568 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 7569 // set the visibility of this record. 7570 if (Record && !Record->getDeclContext()->isRecord()) 7571 AddPushedVisibilityAttribute(Record); 7572} 7573 7574/// \brief Determine whether the given integral value is representable within 7575/// the given type T. 7576static bool isRepresentableIntegerValue(ASTContext &Context, 7577 llvm::APSInt &Value, 7578 QualType T) { 7579 assert(T->isIntegralType(Context) && "Integral type required!"); 7580 unsigned BitWidth = Context.getIntWidth(T); 7581 7582 if (Value.isUnsigned() || Value.isNonNegative()) { 7583 if (T->isSignedIntegerType()) 7584 --BitWidth; 7585 return Value.getActiveBits() <= BitWidth; 7586 } 7587 return Value.getMinSignedBits() <= BitWidth; 7588} 7589 7590// \brief Given an integral type, return the next larger integral type 7591// (or a NULL type of no such type exists). 7592static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 7593 // FIXME: Int128/UInt128 support, which also needs to be introduced into 7594 // enum checking below. 7595 assert(T->isIntegralType(Context) && "Integral type required!"); 7596 const unsigned NumTypes = 4; 7597 QualType SignedIntegralTypes[NumTypes] = { 7598 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 7599 }; 7600 QualType UnsignedIntegralTypes[NumTypes] = { 7601 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 7602 Context.UnsignedLongLongTy 7603 }; 7604 7605 unsigned BitWidth = Context.getTypeSize(T); 7606 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 7607 : UnsignedIntegralTypes; 7608 for (unsigned I = 0; I != NumTypes; ++I) 7609 if (Context.getTypeSize(Types[I]) > BitWidth) 7610 return Types[I]; 7611 7612 return QualType(); 7613} 7614 7615EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 7616 EnumConstantDecl *LastEnumConst, 7617 SourceLocation IdLoc, 7618 IdentifierInfo *Id, 7619 Expr *Val) { 7620 unsigned IntWidth = Context.Target.getIntWidth(); 7621 llvm::APSInt EnumVal(IntWidth); 7622 QualType EltTy; 7623 7624 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 7625 Val = 0; 7626 7627 if (Val) { 7628 if (Enum->isDependentType() || Val->isTypeDependent()) 7629 EltTy = Context.DependentTy; 7630 else { 7631 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 7632 SourceLocation ExpLoc; 7633 if (!Val->isValueDependent() && 7634 VerifyIntegerConstantExpression(Val, &EnumVal)) { 7635 Val = 0; 7636 } else { 7637 if (!getLangOptions().CPlusPlus) { 7638 // C99 6.7.2.2p2: 7639 // The expression that defines the value of an enumeration constant 7640 // shall be an integer constant expression that has a value 7641 // representable as an int. 7642 7643 // Complain if the value is not representable in an int. 7644 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 7645 Diag(IdLoc, diag::ext_enum_value_not_int) 7646 << EnumVal.toString(10) << Val->getSourceRange() 7647 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 7648 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 7649 // Force the type of the expression to 'int'. 7650 ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast); 7651 } 7652 } 7653 7654 if (Enum->isFixed()) { 7655 EltTy = Enum->getIntegerType(); 7656 7657 // C++0x [dcl.enum]p5: 7658 // ... if the initializing value of an enumerator cannot be 7659 // represented by the underlying type, the program is ill-formed. 7660 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 7661 if (getLangOptions().Microsoft) { 7662 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 7663 ImpCastExprToType(Val, EltTy, CK_IntegralCast); 7664 } else 7665 Diag(IdLoc, diag::err_enumerator_too_large) 7666 << EltTy; 7667 } else 7668 ImpCastExprToType(Val, EltTy, CK_IntegralCast); 7669 } 7670 else { 7671 // C++0x [dcl.enum]p5: 7672 // If the underlying type is not fixed, the type of each enumerator 7673 // is the type of its initializing value: 7674 // - If an initializer is specified for an enumerator, the 7675 // initializing value has the same type as the expression. 7676 EltTy = Val->getType(); 7677 } 7678 } 7679 } 7680 } 7681 7682 if (!Val) { 7683 if (Enum->isDependentType()) 7684 EltTy = Context.DependentTy; 7685 else if (!LastEnumConst) { 7686 // C++0x [dcl.enum]p5: 7687 // If the underlying type is not fixed, the type of each enumerator 7688 // is the type of its initializing value: 7689 // - If no initializer is specified for the first enumerator, the 7690 // initializing value has an unspecified integral type. 7691 // 7692 // GCC uses 'int' for its unspecified integral type, as does 7693 // C99 6.7.2.2p3. 7694 if (Enum->isFixed()) { 7695 EltTy = Enum->getIntegerType(); 7696 } 7697 else { 7698 EltTy = Context.IntTy; 7699 } 7700 } else { 7701 // Assign the last value + 1. 7702 EnumVal = LastEnumConst->getInitVal(); 7703 ++EnumVal; 7704 EltTy = LastEnumConst->getType(); 7705 7706 // Check for overflow on increment. 7707 if (EnumVal < LastEnumConst->getInitVal()) { 7708 // C++0x [dcl.enum]p5: 7709 // If the underlying type is not fixed, the type of each enumerator 7710 // is the type of its initializing value: 7711 // 7712 // - Otherwise the type of the initializing value is the same as 7713 // the type of the initializing value of the preceding enumerator 7714 // unless the incremented value is not representable in that type, 7715 // in which case the type is an unspecified integral type 7716 // sufficient to contain the incremented value. If no such type 7717 // exists, the program is ill-formed. 7718 QualType T = getNextLargerIntegralType(Context, EltTy); 7719 if (T.isNull() || Enum->isFixed()) { 7720 // There is no integral type larger enough to represent this 7721 // value. Complain, then allow the value to wrap around. 7722 EnumVal = LastEnumConst->getInitVal(); 7723 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 7724 ++EnumVal; 7725 if (Enum->isFixed()) 7726 // When the underlying type is fixed, this is ill-formed. 7727 Diag(IdLoc, diag::err_enumerator_wrapped) 7728 << EnumVal.toString(10) 7729 << EltTy; 7730 else 7731 Diag(IdLoc, diag::warn_enumerator_too_large) 7732 << EnumVal.toString(10); 7733 } else { 7734 EltTy = T; 7735 } 7736 7737 // Retrieve the last enumerator's value, extent that type to the 7738 // type that is supposed to be large enough to represent the incremented 7739 // value, then increment. 7740 EnumVal = LastEnumConst->getInitVal(); 7741 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 7742 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 7743 ++EnumVal; 7744 7745 // If we're not in C++, diagnose the overflow of enumerator values, 7746 // which in C99 means that the enumerator value is not representable in 7747 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 7748 // permits enumerator values that are representable in some larger 7749 // integral type. 7750 if (!getLangOptions().CPlusPlus && !T.isNull()) 7751 Diag(IdLoc, diag::warn_enum_value_overflow); 7752 } else if (!getLangOptions().CPlusPlus && 7753 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 7754 // Enforce C99 6.7.2.2p2 even when we compute the next value. 7755 Diag(IdLoc, diag::ext_enum_value_not_int) 7756 << EnumVal.toString(10) << 1; 7757 } 7758 } 7759 } 7760 7761 if (!EltTy->isDependentType()) { 7762 // Make the enumerator value match the signedness and size of the 7763 // enumerator's type. 7764 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 7765 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 7766 } 7767 7768 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 7769 Val, EnumVal); 7770} 7771 7772 7773Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 7774 SourceLocation IdLoc, IdentifierInfo *Id, 7775 AttributeList *Attr, 7776 SourceLocation EqualLoc, ExprTy *val) { 7777 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 7778 EnumConstantDecl *LastEnumConst = 7779 cast_or_null<EnumConstantDecl>(lastEnumConst); 7780 Expr *Val = static_cast<Expr*>(val); 7781 7782 // The scope passed in may not be a decl scope. Zip up the scope tree until 7783 // we find one that is. 7784 S = getNonFieldDeclScope(S); 7785 7786 // Verify that there isn't already something declared with this name in this 7787 // scope. 7788 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 7789 ForRedeclaration); 7790 if (PrevDecl && PrevDecl->isTemplateParameter()) { 7791 // Maybe we will complain about the shadowed template parameter. 7792 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 7793 // Just pretend that we didn't see the previous declaration. 7794 PrevDecl = 0; 7795 } 7796 7797 if (PrevDecl) { 7798 // When in C++, we may get a TagDecl with the same name; in this case the 7799 // enum constant will 'hide' the tag. 7800 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 7801 "Received TagDecl when not in C++!"); 7802 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 7803 if (isa<EnumConstantDecl>(PrevDecl)) 7804 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 7805 else 7806 Diag(IdLoc, diag::err_redefinition) << Id; 7807 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7808 return 0; 7809 } 7810 } 7811 7812 // C++ [class.mem]p13: 7813 // If T is the name of a class, then each of the following shall have a 7814 // name different from T: 7815 // - every enumerator of every member of class T that is an enumerated 7816 // type 7817 if (CXXRecordDecl *Record 7818 = dyn_cast<CXXRecordDecl>( 7819 TheEnumDecl->getDeclContext()->getRedeclContext())) 7820 if (Record->getIdentifier() && Record->getIdentifier() == Id) 7821 Diag(IdLoc, diag::err_member_name_of_class) << Id; 7822 7823 EnumConstantDecl *New = 7824 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 7825 7826 if (New) { 7827 // Process attributes. 7828 if (Attr) ProcessDeclAttributeList(S, New, Attr); 7829 7830 // Register this decl in the current scope stack. 7831 New->setAccess(TheEnumDecl->getAccess()); 7832 PushOnScopeChains(New, S); 7833 } 7834 7835 return New; 7836} 7837 7838void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 7839 SourceLocation RBraceLoc, Decl *EnumDeclX, 7840 Decl **Elements, unsigned NumElements, 7841 Scope *S, AttributeList *Attr) { 7842 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 7843 QualType EnumType = Context.getTypeDeclType(Enum); 7844 7845 if (Attr) 7846 ProcessDeclAttributeList(S, Enum, Attr); 7847 7848 if (Enum->isDependentType()) { 7849 for (unsigned i = 0; i != NumElements; ++i) { 7850 EnumConstantDecl *ECD = 7851 cast_or_null<EnumConstantDecl>(Elements[i]); 7852 if (!ECD) continue; 7853 7854 ECD->setType(EnumType); 7855 } 7856 7857 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 7858 return; 7859 } 7860 7861 // TODO: If the result value doesn't fit in an int, it must be a long or long 7862 // long value. ISO C does not support this, but GCC does as an extension, 7863 // emit a warning. 7864 unsigned IntWidth = Context.Target.getIntWidth(); 7865 unsigned CharWidth = Context.Target.getCharWidth(); 7866 unsigned ShortWidth = Context.Target.getShortWidth(); 7867 7868 // Verify that all the values are okay, compute the size of the values, and 7869 // reverse the list. 7870 unsigned NumNegativeBits = 0; 7871 unsigned NumPositiveBits = 0; 7872 7873 // Keep track of whether all elements have type int. 7874 bool AllElementsInt = true; 7875 7876 for (unsigned i = 0; i != NumElements; ++i) { 7877 EnumConstantDecl *ECD = 7878 cast_or_null<EnumConstantDecl>(Elements[i]); 7879 if (!ECD) continue; // Already issued a diagnostic. 7880 7881 const llvm::APSInt &InitVal = ECD->getInitVal(); 7882 7883 // Keep track of the size of positive and negative values. 7884 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 7885 NumPositiveBits = std::max(NumPositiveBits, 7886 (unsigned)InitVal.getActiveBits()); 7887 else 7888 NumNegativeBits = std::max(NumNegativeBits, 7889 (unsigned)InitVal.getMinSignedBits()); 7890 7891 // Keep track of whether every enum element has type int (very commmon). 7892 if (AllElementsInt) 7893 AllElementsInt = ECD->getType() == Context.IntTy; 7894 } 7895 7896 // Figure out the type that should be used for this enum. 7897 QualType BestType; 7898 unsigned BestWidth; 7899 7900 // C++0x N3000 [conv.prom]p3: 7901 // An rvalue of an unscoped enumeration type whose underlying 7902 // type is not fixed can be converted to an rvalue of the first 7903 // of the following types that can represent all the values of 7904 // the enumeration: int, unsigned int, long int, unsigned long 7905 // int, long long int, or unsigned long long int. 7906 // C99 6.4.4.3p2: 7907 // An identifier declared as an enumeration constant has type int. 7908 // The C99 rule is modified by a gcc extension 7909 QualType BestPromotionType; 7910 7911 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 7912 // -fshort-enums is the equivalent to specifying the packed attribute on all 7913 // enum definitions. 7914 if (LangOpts.ShortEnums) 7915 Packed = true; 7916 7917 if (Enum->isFixed()) { 7918 BestType = BestPromotionType = Enum->getIntegerType(); 7919 // We don't need to set BestWidth, because BestType is going to be the type 7920 // of the enumerators, but we do anyway because otherwise some compilers 7921 // warn that it might be used uninitialized. 7922 BestWidth = CharWidth; 7923 } 7924 else if (NumNegativeBits) { 7925 // If there is a negative value, figure out the smallest integer type (of 7926 // int/long/longlong) that fits. 7927 // If it's packed, check also if it fits a char or a short. 7928 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 7929 BestType = Context.SignedCharTy; 7930 BestWidth = CharWidth; 7931 } else if (Packed && NumNegativeBits <= ShortWidth && 7932 NumPositiveBits < ShortWidth) { 7933 BestType = Context.ShortTy; 7934 BestWidth = ShortWidth; 7935 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 7936 BestType = Context.IntTy; 7937 BestWidth = IntWidth; 7938 } else { 7939 BestWidth = Context.Target.getLongWidth(); 7940 7941 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 7942 BestType = Context.LongTy; 7943 } else { 7944 BestWidth = Context.Target.getLongLongWidth(); 7945 7946 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 7947 Diag(Enum->getLocation(), diag::warn_enum_too_large); 7948 BestType = Context.LongLongTy; 7949 } 7950 } 7951 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 7952 } else { 7953 // If there is no negative value, figure out the smallest type that fits 7954 // all of the enumerator values. 7955 // If it's packed, check also if it fits a char or a short. 7956 if (Packed && NumPositiveBits <= CharWidth) { 7957 BestType = Context.UnsignedCharTy; 7958 BestPromotionType = Context.IntTy; 7959 BestWidth = CharWidth; 7960 } else if (Packed && NumPositiveBits <= ShortWidth) { 7961 BestType = Context.UnsignedShortTy; 7962 BestPromotionType = Context.IntTy; 7963 BestWidth = ShortWidth; 7964 } else if (NumPositiveBits <= IntWidth) { 7965 BestType = Context.UnsignedIntTy; 7966 BestWidth = IntWidth; 7967 BestPromotionType 7968 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7969 ? Context.UnsignedIntTy : Context.IntTy; 7970 } else if (NumPositiveBits <= 7971 (BestWidth = Context.Target.getLongWidth())) { 7972 BestType = Context.UnsignedLongTy; 7973 BestPromotionType 7974 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7975 ? Context.UnsignedLongTy : Context.LongTy; 7976 } else { 7977 BestWidth = Context.Target.getLongLongWidth(); 7978 assert(NumPositiveBits <= BestWidth && 7979 "How could an initializer get larger than ULL?"); 7980 BestType = Context.UnsignedLongLongTy; 7981 BestPromotionType 7982 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7983 ? Context.UnsignedLongLongTy : Context.LongLongTy; 7984 } 7985 } 7986 7987 // Loop over all of the enumerator constants, changing their types to match 7988 // the type of the enum if needed. 7989 for (unsigned i = 0; i != NumElements; ++i) { 7990 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 7991 if (!ECD) continue; // Already issued a diagnostic. 7992 7993 // Standard C says the enumerators have int type, but we allow, as an 7994 // extension, the enumerators to be larger than int size. If each 7995 // enumerator value fits in an int, type it as an int, otherwise type it the 7996 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 7997 // that X has type 'int', not 'unsigned'. 7998 7999 // Determine whether the value fits into an int. 8000 llvm::APSInt InitVal = ECD->getInitVal(); 8001 8002 // If it fits into an integer type, force it. Otherwise force it to match 8003 // the enum decl type. 8004 QualType NewTy; 8005 unsigned NewWidth; 8006 bool NewSign; 8007 if (!getLangOptions().CPlusPlus && 8008 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 8009 NewTy = Context.IntTy; 8010 NewWidth = IntWidth; 8011 NewSign = true; 8012 } else if (ECD->getType() == BestType) { 8013 // Already the right type! 8014 if (getLangOptions().CPlusPlus) 8015 // C++ [dcl.enum]p4: Following the closing brace of an 8016 // enum-specifier, each enumerator has the type of its 8017 // enumeration. 8018 ECD->setType(EnumType); 8019 continue; 8020 } else { 8021 NewTy = BestType; 8022 NewWidth = BestWidth; 8023 NewSign = BestType->isSignedIntegerType(); 8024 } 8025 8026 // Adjust the APSInt value. 8027 InitVal = InitVal.extOrTrunc(NewWidth); 8028 InitVal.setIsSigned(NewSign); 8029 ECD->setInitVal(InitVal); 8030 8031 // Adjust the Expr initializer and type. 8032 if (ECD->getInitExpr() && 8033 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 8034 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 8035 CK_IntegralCast, 8036 ECD->getInitExpr(), 8037 /*base paths*/ 0, 8038 VK_RValue)); 8039 if (getLangOptions().CPlusPlus) 8040 // C++ [dcl.enum]p4: Following the closing brace of an 8041 // enum-specifier, each enumerator has the type of its 8042 // enumeration. 8043 ECD->setType(EnumType); 8044 else 8045 ECD->setType(NewTy); 8046 } 8047 8048 Enum->completeDefinition(BestType, BestPromotionType, 8049 NumPositiveBits, NumNegativeBits); 8050} 8051 8052Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 8053 SourceLocation StartLoc, 8054 SourceLocation EndLoc) { 8055 StringLiteral *AsmString = cast<StringLiteral>(expr); 8056 8057 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 8058 AsmString, StartLoc, 8059 EndLoc); 8060 CurContext->addDecl(New); 8061 return New; 8062} 8063 8064void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 8065 SourceLocation PragmaLoc, 8066 SourceLocation NameLoc) { 8067 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 8068 8069 if (PrevDecl) { 8070 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 8071 } else { 8072 (void)WeakUndeclaredIdentifiers.insert( 8073 std::pair<IdentifierInfo*,WeakInfo> 8074 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 8075 } 8076} 8077 8078void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 8079 IdentifierInfo* AliasName, 8080 SourceLocation PragmaLoc, 8081 SourceLocation NameLoc, 8082 SourceLocation AliasNameLoc) { 8083 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 8084 LookupOrdinaryName); 8085 WeakInfo W = WeakInfo(Name, NameLoc); 8086 8087 if (PrevDecl) { 8088 if (!PrevDecl->hasAttr<AliasAttr>()) 8089 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 8090 DeclApplyPragmaWeak(TUScope, ND, W); 8091 } else { 8092 (void)WeakUndeclaredIdentifiers.insert( 8093 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 8094 } 8095} 8096