SemaDecl.cpp revision 7a39dd01edc43aa5f058e7259a39737fc1f43792
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 "clang/AST/APValue.h" 21#include "clang/AST/ASTConsumer.h" 22#include "clang/AST/ASTContext.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclCXX.h" 25#include "clang/AST/DeclObjC.h" 26#include "clang/AST/DeclTemplate.h" 27#include "clang/AST/ExprCXX.h" 28#include "clang/AST/StmtCXX.h" 29#include "clang/Sema/DeclSpec.h" 30#include "clang/Sema/ParsedTemplate.h" 31#include "clang/Parse/ParseDiagnostic.h" 32#include "clang/Basic/PartialDiagnostic.h" 33#include "clang/Basic/SourceManager.h" 34#include "clang/Basic/TargetInfo.h" 35// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 36#include "clang/Lex/Preprocessor.h" 37#include "clang/Lex/HeaderSearch.h" 38#include "llvm/ADT/Triple.h" 39#include <algorithm> 40#include <cstring> 41#include <functional> 42using namespace clang; 43using namespace sema; 44 45Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr) { 46 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 47} 48 49/// \brief If the identifier refers to a type name within this scope, 50/// return the declaration of that type. 51/// 52/// This routine performs ordinary name lookup of the identifier II 53/// within the given scope, with optional C++ scope specifier SS, to 54/// determine whether the name refers to a type. If so, returns an 55/// opaque pointer (actually a QualType) corresponding to that 56/// type. Otherwise, returns NULL. 57/// 58/// If name lookup results in an ambiguity, this routine will complain 59/// and then return NULL. 60ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 61 Scope *S, CXXScopeSpec *SS, 62 bool isClassName, 63 ParsedType ObjectTypePtr) { 64 // Determine where we will perform name lookup. 65 DeclContext *LookupCtx = 0; 66 if (ObjectTypePtr) { 67 QualType ObjectType = ObjectTypePtr.get(); 68 if (ObjectType->isRecordType()) 69 LookupCtx = computeDeclContext(ObjectType); 70 } else if (SS && SS->isNotEmpty()) { 71 LookupCtx = computeDeclContext(*SS, false); 72 73 if (!LookupCtx) { 74 if (isDependentScopeSpecifier(*SS)) { 75 // C++ [temp.res]p3: 76 // A qualified-id that refers to a type and in which the 77 // nested-name-specifier depends on a template-parameter (14.6.2) 78 // shall be prefixed by the keyword typename to indicate that the 79 // qualified-id denotes a type, forming an 80 // elaborated-type-specifier (7.1.5.3). 81 // 82 // We therefore do not perform any name lookup if the result would 83 // refer to a member of an unknown specialization. 84 if (!isClassName) 85 return ParsedType(); 86 87 // We know from the grammar that this name refers to a type, 88 // so build a dependent node to describe the type. 89 QualType T = 90 CheckTypenameType(ETK_None, SS->getScopeRep(), II, 91 SourceLocation(), SS->getRange(), NameLoc); 92 return ParsedType::make(T); 93 } 94 95 return ParsedType(); 96 } 97 98 if (!LookupCtx->isDependentContext() && 99 RequireCompleteDeclContext(*SS, LookupCtx)) 100 return ParsedType(); 101 } 102 103 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 104 // lookup for class-names. 105 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 106 LookupOrdinaryName; 107 LookupResult Result(*this, &II, NameLoc, Kind); 108 if (LookupCtx) { 109 // Perform "qualified" name lookup into the declaration context we 110 // computed, which is either the type of the base of a member access 111 // expression or the declaration context associated with a prior 112 // nested-name-specifier. 113 LookupQualifiedName(Result, LookupCtx); 114 115 if (ObjectTypePtr && Result.empty()) { 116 // C++ [basic.lookup.classref]p3: 117 // If the unqualified-id is ~type-name, the type-name is looked up 118 // in the context of the entire postfix-expression. If the type T of 119 // the object expression is of a class type C, the type-name is also 120 // looked up in the scope of class C. At least one of the lookups shall 121 // find a name that refers to (possibly cv-qualified) T. 122 LookupName(Result, S); 123 } 124 } else { 125 // Perform unqualified name lookup. 126 LookupName(Result, S); 127 } 128 129 NamedDecl *IIDecl = 0; 130 switch (Result.getResultKind()) { 131 case LookupResult::NotFound: 132 case LookupResult::NotFoundInCurrentInstantiation: 133 case LookupResult::FoundOverloaded: 134 case LookupResult::FoundUnresolvedValue: 135 Result.suppressDiagnostics(); 136 return ParsedType(); 137 138 case LookupResult::Ambiguous: 139 // Recover from type-hiding ambiguities by hiding the type. We'll 140 // do the lookup again when looking for an object, and we can 141 // diagnose the error then. If we don't do this, then the error 142 // about hiding the type will be immediately followed by an error 143 // that only makes sense if the identifier was treated like a type. 144 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 145 Result.suppressDiagnostics(); 146 return ParsedType(); 147 } 148 149 // Look to see if we have a type anywhere in the list of results. 150 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 151 Res != ResEnd; ++Res) { 152 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 153 if (!IIDecl || 154 (*Res)->getLocation().getRawEncoding() < 155 IIDecl->getLocation().getRawEncoding()) 156 IIDecl = *Res; 157 } 158 } 159 160 if (!IIDecl) { 161 // None of the entities we found is a type, so there is no way 162 // to even assume that the result is a type. In this case, don't 163 // complain about the ambiguity. The parser will either try to 164 // perform this lookup again (e.g., as an object name), which 165 // will produce the ambiguity, or will complain that it expected 166 // a type name. 167 Result.suppressDiagnostics(); 168 return ParsedType(); 169 } 170 171 // We found a type within the ambiguous lookup; diagnose the 172 // ambiguity and then return that type. This might be the right 173 // answer, or it might not be, but it suppresses any attempt to 174 // perform the name lookup again. 175 break; 176 177 case LookupResult::Found: 178 IIDecl = Result.getFoundDecl(); 179 break; 180 } 181 182 assert(IIDecl && "Didn't find decl"); 183 184 QualType T; 185 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 186 DiagnoseUseOfDecl(IIDecl, NameLoc); 187 188 if (T.isNull()) 189 T = Context.getTypeDeclType(TD); 190 191 if (SS) 192 T = getElaboratedType(ETK_None, *SS, T); 193 194 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 195 T = Context.getObjCInterfaceType(IDecl); 196 } else { 197 // If it's not plausibly a type, suppress diagnostics. 198 Result.suppressDiagnostics(); 199 return ParsedType(); 200 } 201 202 return ParsedType::make(T); 203} 204 205/// isTagName() - This method is called *for error recovery purposes only* 206/// to determine if the specified name is a valid tag name ("struct foo"). If 207/// so, this returns the TST for the tag corresponding to it (TST_enum, 208/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 209/// where the user forgot to specify the tag. 210DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 211 // Do a tag name lookup in this scope. 212 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 213 LookupName(R, S, false); 214 R.suppressDiagnostics(); 215 if (R.getResultKind() == LookupResult::Found) 216 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 217 switch (TD->getTagKind()) { 218 default: return DeclSpec::TST_unspecified; 219 case TTK_Struct: return DeclSpec::TST_struct; 220 case TTK_Union: return DeclSpec::TST_union; 221 case TTK_Class: return DeclSpec::TST_class; 222 case TTK_Enum: return DeclSpec::TST_enum; 223 } 224 } 225 226 return DeclSpec::TST_unspecified; 227} 228 229bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 230 SourceLocation IILoc, 231 Scope *S, 232 CXXScopeSpec *SS, 233 ParsedType &SuggestedType) { 234 // We don't have anything to suggest (yet). 235 SuggestedType = ParsedType(); 236 237 // There may have been a typo in the name of the type. Look up typo 238 // results, in case we have something that we can suggest. 239 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 240 NotForRedeclaration); 241 242 if (DeclarationName Corrected = CorrectTypo(Lookup, S, SS, 0, 0, CTC_Type)) { 243 if (NamedDecl *Result = Lookup.getAsSingle<NamedDecl>()) { 244 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 245 !Result->isInvalidDecl()) { 246 // We found a similarly-named type or interface; suggest that. 247 if (!SS || !SS->isSet()) 248 Diag(IILoc, diag::err_unknown_typename_suggest) 249 << &II << Lookup.getLookupName() 250 << FixItHint::CreateReplacement(SourceRange(IILoc), 251 Result->getNameAsString()); 252 else if (DeclContext *DC = computeDeclContext(*SS, false)) 253 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 254 << &II << DC << Lookup.getLookupName() << SS->getRange() 255 << FixItHint::CreateReplacement(SourceRange(IILoc), 256 Result->getNameAsString()); 257 else 258 llvm_unreachable("could not have corrected a typo here"); 259 260 Diag(Result->getLocation(), diag::note_previous_decl) 261 << Result->getDeclName(); 262 263 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS); 264 return true; 265 } 266 } else if (Lookup.empty()) { 267 // We corrected to a keyword. 268 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 269 Diag(IILoc, diag::err_unknown_typename_suggest) 270 << &II << Corrected; 271 return true; 272 } 273 } 274 275 if (getLangOptions().CPlusPlus) { 276 // See if II is a class template that the user forgot to pass arguments to. 277 UnqualifiedId Name; 278 Name.setIdentifier(&II, IILoc); 279 CXXScopeSpec EmptySS; 280 TemplateTy TemplateResult; 281 bool MemberOfUnknownSpecialization; 282 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 283 Name, ParsedType(), true, TemplateResult, 284 MemberOfUnknownSpecialization) == TNK_Type_template) { 285 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 286 Diag(IILoc, diag::err_template_missing_args) << TplName; 287 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 288 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 289 << TplDecl->getTemplateParameters()->getSourceRange(); 290 } 291 return true; 292 } 293 } 294 295 // FIXME: Should we move the logic that tries to recover from a missing tag 296 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 297 298 if (!SS || (!SS->isSet() && !SS->isInvalid())) 299 Diag(IILoc, diag::err_unknown_typename) << &II; 300 else if (DeclContext *DC = computeDeclContext(*SS, false)) 301 Diag(IILoc, diag::err_typename_nested_not_found) 302 << &II << DC << SS->getRange(); 303 else if (isDependentScopeSpecifier(*SS)) { 304 Diag(SS->getRange().getBegin(), diag::err_typename_missing) 305 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 306 << SourceRange(SS->getRange().getBegin(), IILoc) 307 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 308 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 309 } else { 310 assert(SS && SS->isInvalid() && 311 "Invalid scope specifier has already been diagnosed"); 312 } 313 314 return true; 315} 316 317// Determines the context to return to after temporarily entering a 318// context. This depends in an unnecessarily complicated way on the 319// exact ordering of callbacks from the parser. 320DeclContext *Sema::getContainingDC(DeclContext *DC) { 321 322 // Functions defined inline within classes aren't parsed until we've 323 // finished parsing the top-level class, so the top-level class is 324 // the context we'll need to return to. 325 if (isa<FunctionDecl>(DC)) { 326 DC = DC->getLexicalParent(); 327 328 // A function not defined within a class will always return to its 329 // lexical context. 330 if (!isa<CXXRecordDecl>(DC)) 331 return DC; 332 333 // A C++ inline method/friend is parsed *after* the topmost class 334 // it was declared in is fully parsed ("complete"); the topmost 335 // class is the context we need to return to. 336 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 337 DC = RD; 338 339 // Return the declaration context of the topmost class the inline method is 340 // declared in. 341 return DC; 342 } 343 344 // ObjCMethodDecls are parsed (for some reason) outside the context 345 // of the class. 346 if (isa<ObjCMethodDecl>(DC)) 347 return DC->getLexicalParent()->getLexicalParent(); 348 349 return DC->getLexicalParent(); 350} 351 352void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 353 assert(getContainingDC(DC) == CurContext && 354 "The next DeclContext should be lexically contained in the current one."); 355 CurContext = DC; 356 S->setEntity(DC); 357} 358 359void Sema::PopDeclContext() { 360 assert(CurContext && "DeclContext imbalance!"); 361 362 CurContext = getContainingDC(CurContext); 363 assert(CurContext && "Popped translation unit!"); 364} 365 366/// EnterDeclaratorContext - Used when we must lookup names in the context 367/// of a declarator's nested name specifier. 368/// 369void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 370 // C++0x [basic.lookup.unqual]p13: 371 // A name used in the definition of a static data member of class 372 // X (after the qualified-id of the static member) is looked up as 373 // if the name was used in a member function of X. 374 // C++0x [basic.lookup.unqual]p14: 375 // If a variable member of a namespace is defined outside of the 376 // scope of its namespace then any name used in the definition of 377 // the variable member (after the declarator-id) is looked up as 378 // if the definition of the variable member occurred in its 379 // namespace. 380 // Both of these imply that we should push a scope whose context 381 // is the semantic context of the declaration. We can't use 382 // PushDeclContext here because that context is not necessarily 383 // lexically contained in the current context. Fortunately, 384 // the containing scope should have the appropriate information. 385 386 assert(!S->getEntity() && "scope already has entity"); 387 388#ifndef NDEBUG 389 Scope *Ancestor = S->getParent(); 390 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 391 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 392#endif 393 394 CurContext = DC; 395 S->setEntity(DC); 396} 397 398void Sema::ExitDeclaratorContext(Scope *S) { 399 assert(S->getEntity() == CurContext && "Context imbalance!"); 400 401 // Switch back to the lexical context. The safety of this is 402 // enforced by an assert in EnterDeclaratorContext. 403 Scope *Ancestor = S->getParent(); 404 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 405 CurContext = (DeclContext*) Ancestor->getEntity(); 406 407 // We don't need to do anything with the scope, which is going to 408 // disappear. 409} 410 411/// \brief Determine whether we allow overloading of the function 412/// PrevDecl with another declaration. 413/// 414/// This routine determines whether overloading is possible, not 415/// whether some new function is actually an overload. It will return 416/// true in C++ (where we can always provide overloads) or, as an 417/// extension, in C when the previous function is already an 418/// overloaded function declaration or has the "overloadable" 419/// attribute. 420static bool AllowOverloadingOfFunction(LookupResult &Previous, 421 ASTContext &Context) { 422 if (Context.getLangOptions().CPlusPlus) 423 return true; 424 425 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 426 return true; 427 428 return (Previous.getResultKind() == LookupResult::Found 429 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 430} 431 432/// Add this decl to the scope shadowed decl chains. 433void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 434 // Move up the scope chain until we find the nearest enclosing 435 // non-transparent context. The declaration will be introduced into this 436 // scope. 437 while (S->getEntity() && 438 ((DeclContext *)S->getEntity())->isTransparentContext()) 439 S = S->getParent(); 440 441 // Add scoped declarations into their context, so that they can be 442 // found later. Declarations without a context won't be inserted 443 // into any context. 444 if (AddToContext) 445 CurContext->addDecl(D); 446 447 // Out-of-line definitions shouldn't be pushed into scope in C++. 448 // Out-of-line variable and function definitions shouldn't even in C. 449 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 450 D->isOutOfLine()) 451 return; 452 453 // Template instantiations should also not be pushed into scope. 454 if (isa<FunctionDecl>(D) && 455 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 456 return; 457 458 // If this replaces anything in the current scope, 459 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 460 IEnd = IdResolver.end(); 461 for (; I != IEnd; ++I) { 462 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 463 S->RemoveDecl(*I); 464 IdResolver.RemoveDecl(*I); 465 466 // Should only need to replace one decl. 467 break; 468 } 469 } 470 471 S->AddDecl(D); 472 IdResolver.AddDecl(D); 473} 474 475bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) { 476 return IdResolver.isDeclInScope(D, Ctx, Context, S); 477} 478 479Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 480 DeclContext *TargetDC = DC->getPrimaryContext(); 481 do { 482 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 483 if (ScopeDC->getPrimaryContext() == TargetDC) 484 return S; 485 } while ((S = S->getParent())); 486 487 return 0; 488} 489 490static bool isOutOfScopePreviousDeclaration(NamedDecl *, 491 DeclContext*, 492 ASTContext&); 493 494/// Filters out lookup results that don't fall within the given scope 495/// as determined by isDeclInScope. 496static void FilterLookupForScope(Sema &SemaRef, LookupResult &R, 497 DeclContext *Ctx, Scope *S, 498 bool ConsiderLinkage) { 499 LookupResult::Filter F = R.makeFilter(); 500 while (F.hasNext()) { 501 NamedDecl *D = F.next(); 502 503 if (SemaRef.isDeclInScope(D, Ctx, S)) 504 continue; 505 506 if (ConsiderLinkage && 507 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context)) 508 continue; 509 510 F.erase(); 511 } 512 513 F.done(); 514} 515 516static bool isUsingDecl(NamedDecl *D) { 517 return isa<UsingShadowDecl>(D) || 518 isa<UnresolvedUsingTypenameDecl>(D) || 519 isa<UnresolvedUsingValueDecl>(D); 520} 521 522/// Removes using shadow declarations from the lookup results. 523static void RemoveUsingDecls(LookupResult &R) { 524 LookupResult::Filter F = R.makeFilter(); 525 while (F.hasNext()) 526 if (isUsingDecl(F.next())) 527 F.erase(); 528 529 F.done(); 530} 531 532/// \brief Check for this common pattern: 533/// @code 534/// class S { 535/// S(const S&); // DO NOT IMPLEMENT 536/// void operator=(const S&); // DO NOT IMPLEMENT 537/// }; 538/// @endcode 539static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 540 // FIXME: Should check for private access too but access is set after we get 541 // the decl here. 542 if (D->isThisDeclarationADefinition()) 543 return false; 544 545 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 546 return CD->isCopyConstructor(); 547 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 548 return Method->isCopyAssignmentOperator(); 549 return false; 550} 551 552bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 553 assert(D); 554 555 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 556 return false; 557 558 // Ignore class templates. 559 if (D->getDeclContext()->isDependentContext()) 560 return false; 561 562 // We warn for unused decls internal to the translation unit. 563 if (D->getLinkage() == ExternalLinkage) 564 return false; 565 566 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 567 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 568 return false; 569 570 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 571 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 572 return false; 573 } else { 574 // 'static inline' functions are used in headers; don't warn. 575 if (FD->getStorageClass() == SC_Static && 576 FD->isInlineSpecified()) 577 return false; 578 } 579 580 if (FD->isThisDeclarationADefinition()) 581 return !Context.DeclMustBeEmitted(FD); 582 return true; 583 } 584 585 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 586 if (VD->isStaticDataMember() && 587 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 588 return false; 589 590 if ( VD->isFileVarDecl() && 591 !VD->getType().isConstant(Context)) 592 return !Context.DeclMustBeEmitted(VD); 593 } 594 595 return false; 596 } 597 598 void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 599 if (!D) 600 return; 601 602 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 603 const FunctionDecl *First = FD->getFirstDeclaration(); 604 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 605 return; // First should already be in the vector. 606 } 607 608 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 609 const VarDecl *First = VD->getFirstDeclaration(); 610 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 611 return; // First should already be in the vector. 612 } 613 614 if (ShouldWarnIfUnusedFileScopedDecl(D)) 615 UnusedFileScopedDecls.push_back(D); 616 } 617 618static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 619 if (D->isInvalidDecl()) 620 return false; 621 622 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 623 return false; 624 625 // White-list anything that isn't a local variable. 626 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 627 !D->getDeclContext()->isFunctionOrMethod()) 628 return false; 629 630 // Types of valid local variables should be complete, so this should succeed. 631 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 632 633 // White-list anything with an __attribute__((unused)) type. 634 QualType Ty = VD->getType(); 635 636 // Only look at the outermost level of typedef. 637 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 638 if (TT->getDecl()->hasAttr<UnusedAttr>()) 639 return false; 640 } 641 642 // If we failed to complete the type for some reason, or if the type is 643 // dependent, don't diagnose the variable. 644 if (Ty->isIncompleteType() || Ty->isDependentType()) 645 return false; 646 647 if (const TagType *TT = Ty->getAs<TagType>()) { 648 const TagDecl *Tag = TT->getDecl(); 649 if (Tag->hasAttr<UnusedAttr>()) 650 return false; 651 652 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 653 // FIXME: Checking for the presence of a user-declared constructor 654 // isn't completely accurate; we'd prefer to check that the initializer 655 // has no side effects. 656 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 657 return false; 658 } 659 } 660 661 // TODO: __attribute__((unused)) templates? 662 } 663 664 return true; 665} 666 667void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 668 if (!ShouldDiagnoseUnusedDecl(D)) 669 return; 670 671 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 672 Diag(D->getLocation(), diag::warn_unused_exception_param) 673 << D->getDeclName(); 674 else 675 Diag(D->getLocation(), diag::warn_unused_variable) 676 << D->getDeclName(); 677} 678 679void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 680 if (S->decl_empty()) return; 681 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 682 "Scope shouldn't contain decls!"); 683 684 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 685 I != E; ++I) { 686 Decl *TmpD = (*I); 687 assert(TmpD && "This decl didn't get pushed??"); 688 689 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 690 NamedDecl *D = cast<NamedDecl>(TmpD); 691 692 if (!D->getDeclName()) continue; 693 694 // Diagnose unused variables in this scope. 695 if (S->getNumErrorsAtStart() == getDiagnostics().getNumErrors()) 696 DiagnoseUnusedDecl(D); 697 698 // Remove this name from our lexical scope. 699 IdResolver.RemoveDecl(D); 700 } 701} 702 703/// \brief Look for an Objective-C class in the translation unit. 704/// 705/// \param Id The name of the Objective-C class we're looking for. If 706/// typo-correction fixes this name, the Id will be updated 707/// to the fixed name. 708/// 709/// \param IdLoc The location of the name in the translation unit. 710/// 711/// \param TypoCorrection If true, this routine will attempt typo correction 712/// if there is no class with the given name. 713/// 714/// \returns The declaration of the named Objective-C class, or NULL if the 715/// class could not be found. 716ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 717 SourceLocation IdLoc, 718 bool TypoCorrection) { 719 // The third "scope" argument is 0 since we aren't enabling lazy built-in 720 // creation from this context. 721 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 722 723 if (!IDecl && TypoCorrection) { 724 // Perform typo correction at the given location, but only if we 725 // find an Objective-C class name. 726 LookupResult R(*this, Id, IdLoc, LookupOrdinaryName); 727 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 728 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 729 Diag(IdLoc, diag::err_undef_interface_suggest) 730 << Id << IDecl->getDeclName() 731 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 732 Diag(IDecl->getLocation(), diag::note_previous_decl) 733 << IDecl->getDeclName(); 734 735 Id = IDecl->getIdentifier(); 736 } 737 } 738 739 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 740} 741 742/// getNonFieldDeclScope - Retrieves the innermost scope, starting 743/// from S, where a non-field would be declared. This routine copes 744/// with the difference between C and C++ scoping rules in structs and 745/// unions. For example, the following code is well-formed in C but 746/// ill-formed in C++: 747/// @code 748/// struct S6 { 749/// enum { BAR } e; 750/// }; 751/// 752/// void test_S6() { 753/// struct S6 a; 754/// a.e = BAR; 755/// } 756/// @endcode 757/// For the declaration of BAR, this routine will return a different 758/// scope. The scope S will be the scope of the unnamed enumeration 759/// within S6. In C++, this routine will return the scope associated 760/// with S6, because the enumeration's scope is a transparent 761/// context but structures can contain non-field names. In C, this 762/// routine will return the translation unit scope, since the 763/// enumeration's scope is a transparent context and structures cannot 764/// contain non-field names. 765Scope *Sema::getNonFieldDeclScope(Scope *S) { 766 while (((S->getFlags() & Scope::DeclScope) == 0) || 767 (S->getEntity() && 768 ((DeclContext *)S->getEntity())->isTransparentContext()) || 769 (S->isClassScope() && !getLangOptions().CPlusPlus)) 770 S = S->getParent(); 771 return S; 772} 773 774void Sema::InitBuiltinVaListType() { 775 if (!Context.getBuiltinVaListType().isNull()) 776 return; 777 778 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 779 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, SourceLocation(), 780 LookupOrdinaryName, ForRedeclaration); 781 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 782 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 783} 784 785/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 786/// file scope. lazily create a decl for it. ForRedeclaration is true 787/// if we're creating this built-in in anticipation of redeclaring the 788/// built-in. 789NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 790 Scope *S, bool ForRedeclaration, 791 SourceLocation Loc) { 792 Builtin::ID BID = (Builtin::ID)bid; 793 794 if (Context.BuiltinInfo.hasVAListUse(BID)) 795 InitBuiltinVaListType(); 796 797 ASTContext::GetBuiltinTypeError Error; 798 QualType R = Context.GetBuiltinType(BID, Error); 799 switch (Error) { 800 case ASTContext::GE_None: 801 // Okay 802 break; 803 804 case ASTContext::GE_Missing_stdio: 805 if (ForRedeclaration) 806 Diag(Loc, diag::err_implicit_decl_requires_stdio) 807 << Context.BuiltinInfo.GetName(BID); 808 return 0; 809 810 case ASTContext::GE_Missing_setjmp: 811 if (ForRedeclaration) 812 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 813 << Context.BuiltinInfo.GetName(BID); 814 return 0; 815 } 816 817 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 818 Diag(Loc, diag::ext_implicit_lib_function_decl) 819 << Context.BuiltinInfo.GetName(BID) 820 << R; 821 if (Context.BuiltinInfo.getHeaderName(BID) && 822 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 823 != Diagnostic::Ignored) 824 Diag(Loc, diag::note_please_include_header) 825 << Context.BuiltinInfo.getHeaderName(BID) 826 << Context.BuiltinInfo.GetName(BID); 827 } 828 829 FunctionDecl *New = FunctionDecl::Create(Context, 830 Context.getTranslationUnitDecl(), 831 Loc, II, R, /*TInfo=*/0, 832 SC_Extern, 833 SC_None, false, 834 /*hasPrototype=*/true); 835 New->setImplicit(); 836 837 // Create Decl objects for each parameter, adding them to the 838 // FunctionDecl. 839 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 840 llvm::SmallVector<ParmVarDecl*, 16> Params; 841 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 842 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 843 FT->getArgType(i), /*TInfo=*/0, 844 SC_None, SC_None, 0)); 845 New->setParams(Params.data(), Params.size()); 846 } 847 848 AddKnownFunctionAttributes(New); 849 850 // TUScope is the translation-unit scope to insert this function into. 851 // FIXME: This is hideous. We need to teach PushOnScopeChains to 852 // relate Scopes to DeclContexts, and probably eliminate CurContext 853 // entirely, but we're not there yet. 854 DeclContext *SavedContext = CurContext; 855 CurContext = Context.getTranslationUnitDecl(); 856 PushOnScopeChains(New, TUScope); 857 CurContext = SavedContext; 858 return New; 859} 860 861/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 862/// same name and scope as a previous declaration 'Old'. Figure out 863/// how to resolve this situation, merging decls or emitting 864/// diagnostics as appropriate. If there was an error, set New to be invalid. 865/// 866void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 867 // If the new decl is known invalid already, don't bother doing any 868 // merging checks. 869 if (New->isInvalidDecl()) return; 870 871 // Allow multiple definitions for ObjC built-in typedefs. 872 // FIXME: Verify the underlying types are equivalent! 873 if (getLangOptions().ObjC1) { 874 const IdentifierInfo *TypeID = New->getIdentifier(); 875 switch (TypeID->getLength()) { 876 default: break; 877 case 2: 878 if (!TypeID->isStr("id")) 879 break; 880 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 881 // Install the built-in type for 'id', ignoring the current definition. 882 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 883 return; 884 case 5: 885 if (!TypeID->isStr("Class")) 886 break; 887 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 888 // Install the built-in type for 'Class', ignoring the current definition. 889 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 890 return; 891 case 3: 892 if (!TypeID->isStr("SEL")) 893 break; 894 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 895 // Install the built-in type for 'SEL', ignoring the current definition. 896 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 897 return; 898 case 8: 899 if (!TypeID->isStr("Protocol")) 900 break; 901 Context.setObjCProtoType(New->getUnderlyingType()); 902 return; 903 } 904 // Fall through - the typedef name was not a builtin type. 905 } 906 907 // Verify the old decl was also a type. 908 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 909 if (!Old) { 910 Diag(New->getLocation(), diag::err_redefinition_different_kind) 911 << New->getDeclName(); 912 913 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 914 if (OldD->getLocation().isValid()) 915 Diag(OldD->getLocation(), diag::note_previous_definition); 916 917 return New->setInvalidDecl(); 918 } 919 920 // If the old declaration is invalid, just give up here. 921 if (Old->isInvalidDecl()) 922 return New->setInvalidDecl(); 923 924 // Determine the "old" type we'll use for checking and diagnostics. 925 QualType OldType; 926 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 927 OldType = OldTypedef->getUnderlyingType(); 928 else 929 OldType = Context.getTypeDeclType(Old); 930 931 // If the typedef types are not identical, reject them in all languages and 932 // with any extensions enabled. 933 934 if (OldType != New->getUnderlyingType() && 935 Context.getCanonicalType(OldType) != 936 Context.getCanonicalType(New->getUnderlyingType())) { 937 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 938 << New->getUnderlyingType() << OldType; 939 if (Old->getLocation().isValid()) 940 Diag(Old->getLocation(), diag::note_previous_definition); 941 return New->setInvalidDecl(); 942 } 943 944 // The types match. Link up the redeclaration chain if the old 945 // declaration was a typedef. 946 // FIXME: this is a potential source of wierdness if the type 947 // spellings don't match exactly. 948 if (isa<TypedefDecl>(Old)) 949 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 950 951 if (getLangOptions().Microsoft) 952 return; 953 954 if (getLangOptions().CPlusPlus) { 955 // C++ [dcl.typedef]p2: 956 // In a given non-class scope, a typedef specifier can be used to 957 // redefine the name of any type declared in that scope to refer 958 // to the type to which it already refers. 959 if (!isa<CXXRecordDecl>(CurContext)) 960 return; 961 962 // C++0x [dcl.typedef]p4: 963 // In a given class scope, a typedef specifier can be used to redefine 964 // any class-name declared in that scope that is not also a typedef-name 965 // to refer to the type to which it already refers. 966 // 967 // This wording came in via DR424, which was a correction to the 968 // wording in DR56, which accidentally banned code like: 969 // 970 // struct S { 971 // typedef struct A { } A; 972 // }; 973 // 974 // in the C++03 standard. We implement the C++0x semantics, which 975 // allow the above but disallow 976 // 977 // struct S { 978 // typedef int I; 979 // typedef int I; 980 // }; 981 // 982 // since that was the intent of DR56. 983 if (!isa<TypedefDecl >(Old)) 984 return; 985 986 Diag(New->getLocation(), diag::err_redefinition) 987 << New->getDeclName(); 988 Diag(Old->getLocation(), diag::note_previous_definition); 989 return New->setInvalidDecl(); 990 } 991 992 // If we have a redefinition of a typedef in C, emit a warning. This warning 993 // is normally mapped to an error, but can be controlled with 994 // -Wtypedef-redefinition. If either the original or the redefinition is 995 // in a system header, don't emit this for compatibility with GCC. 996 if (getDiagnostics().getSuppressSystemWarnings() && 997 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 998 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 999 return; 1000 1001 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1002 << New->getDeclName(); 1003 Diag(Old->getLocation(), diag::note_previous_definition); 1004 return; 1005} 1006 1007/// DeclhasAttr - returns true if decl Declaration already has the target 1008/// attribute. 1009static bool 1010DeclHasAttr(const Decl *D, const Attr *A) { 1011 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1012 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1013 if ((*i)->getKind() == A->getKind()) { 1014 // FIXME: Don't hardcode this check 1015 if (OA && isa<OwnershipAttr>(*i)) 1016 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1017 return true; 1018 } 1019 1020 return false; 1021} 1022 1023/// MergeDeclAttributes - append attributes from the Old decl to the New one. 1024static void MergeDeclAttributes(Decl *New, Decl *Old, ASTContext &C) { 1025 if (!Old->hasAttrs()) 1026 return; 1027 // Ensure that any moving of objects within the allocated map is done before 1028 // we process them. 1029 if (!New->hasAttrs()) 1030 New->setAttrs(AttrVec()); 1031 for (Decl::attr_iterator i = Old->attr_begin(), e = Old->attr_end(); i != e; 1032 ++i) { 1033 // FIXME: Make this more general than just checking for Overloadable. 1034 if (!DeclHasAttr(New, *i) && (*i)->getKind() != attr::Overloadable) { 1035 Attr *NewAttr = (*i)->clone(C); 1036 NewAttr->setInherited(true); 1037 New->addAttr(NewAttr); 1038 } 1039 } 1040} 1041 1042namespace { 1043 1044/// Used in MergeFunctionDecl to keep track of function parameters in 1045/// C. 1046struct GNUCompatibleParamWarning { 1047 ParmVarDecl *OldParm; 1048 ParmVarDecl *NewParm; 1049 QualType PromotedType; 1050}; 1051 1052} 1053 1054/// getSpecialMember - get the special member enum for a method. 1055Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1056 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1057 if (Ctor->isCopyConstructor()) 1058 return Sema::CXXCopyConstructor; 1059 1060 return Sema::CXXConstructor; 1061 } 1062 1063 if (isa<CXXDestructorDecl>(MD)) 1064 return Sema::CXXDestructor; 1065 1066 assert(MD->isCopyAssignmentOperator() && 1067 "Must have copy assignment operator"); 1068 return Sema::CXXCopyAssignment; 1069} 1070 1071/// canRedefineFunction - checks if a function can be redefined. Currently, 1072/// only extern inline functions can be redefined, and even then only in 1073/// GNU89 mode. 1074static bool canRedefineFunction(const FunctionDecl *FD, 1075 const LangOptions& LangOpts) { 1076 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 1077 FD->isInlineSpecified() && 1078 FD->getStorageClass() == SC_Extern); 1079} 1080 1081/// MergeFunctionDecl - We just parsed a function 'New' from 1082/// declarator D which has the same name and scope as a previous 1083/// declaration 'Old'. Figure out how to resolve this situation, 1084/// merging decls or emitting diagnostics as appropriate. 1085/// 1086/// In C++, New and Old must be declarations that are not 1087/// overloaded. Use IsOverload to determine whether New and Old are 1088/// overloaded, and to select the Old declaration that New should be 1089/// merged with. 1090/// 1091/// Returns true if there was an error, false otherwise. 1092bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1093 // Verify the old decl was also a function. 1094 FunctionDecl *Old = 0; 1095 if (FunctionTemplateDecl *OldFunctionTemplate 1096 = dyn_cast<FunctionTemplateDecl>(OldD)) 1097 Old = OldFunctionTemplate->getTemplatedDecl(); 1098 else 1099 Old = dyn_cast<FunctionDecl>(OldD); 1100 if (!Old) { 1101 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1102 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1103 Diag(Shadow->getTargetDecl()->getLocation(), 1104 diag::note_using_decl_target); 1105 Diag(Shadow->getUsingDecl()->getLocation(), 1106 diag::note_using_decl) << 0; 1107 return true; 1108 } 1109 1110 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1111 << New->getDeclName(); 1112 Diag(OldD->getLocation(), diag::note_previous_definition); 1113 return true; 1114 } 1115 1116 // Determine whether the previous declaration was a definition, 1117 // implicit declaration, or a declaration. 1118 diag::kind PrevDiag; 1119 if (Old->isThisDeclarationADefinition()) 1120 PrevDiag = diag::note_previous_definition; 1121 else if (Old->isImplicit()) 1122 PrevDiag = diag::note_previous_implicit_declaration; 1123 else 1124 PrevDiag = diag::note_previous_declaration; 1125 1126 QualType OldQType = Context.getCanonicalType(Old->getType()); 1127 QualType NewQType = Context.getCanonicalType(New->getType()); 1128 1129 // Don't complain about this if we're in GNU89 mode and the old function 1130 // is an extern inline function. 1131 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1132 New->getStorageClass() == SC_Static && 1133 Old->getStorageClass() != SC_Static && 1134 !canRedefineFunction(Old, getLangOptions())) { 1135 Diag(New->getLocation(), diag::err_static_non_static) 1136 << New; 1137 Diag(Old->getLocation(), PrevDiag); 1138 return true; 1139 } 1140 1141 // If a function is first declared with a calling convention, but is 1142 // later declared or defined without one, the second decl assumes the 1143 // calling convention of the first. 1144 // 1145 // For the new decl, we have to look at the NON-canonical type to tell the 1146 // difference between a function that really doesn't have a calling 1147 // convention and one that is declared cdecl. That's because in 1148 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1149 // because it is the default calling convention. 1150 // 1151 // Note also that we DO NOT return at this point, because we still have 1152 // other tests to run. 1153 const FunctionType *OldType = OldQType->getAs<FunctionType>(); 1154 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1155 const FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1156 const FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1157 if (OldTypeInfo.getCC() != CC_Default && 1158 NewTypeInfo.getCC() == CC_Default) { 1159 NewQType = Context.getCallConvType(NewQType, OldTypeInfo.getCC()); 1160 New->setType(NewQType); 1161 NewQType = Context.getCanonicalType(NewQType); 1162 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1163 NewTypeInfo.getCC())) { 1164 // Calling conventions really aren't compatible, so complain. 1165 Diag(New->getLocation(), diag::err_cconv_change) 1166 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1167 << (OldTypeInfo.getCC() == CC_Default) 1168 << (OldTypeInfo.getCC() == CC_Default ? "" : 1169 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1170 Diag(Old->getLocation(), diag::note_previous_declaration); 1171 return true; 1172 } 1173 1174 // FIXME: diagnose the other way around? 1175 if (OldType->getNoReturnAttr() && !NewType->getNoReturnAttr()) { 1176 NewQType = Context.getNoReturnType(NewQType); 1177 New->setType(NewQType); 1178 assert(NewQType.isCanonical()); 1179 } 1180 1181 // Merge regparm attribute. 1182 if (OldType->getRegParmType() != NewType->getRegParmType()) { 1183 if (NewType->getRegParmType()) { 1184 Diag(New->getLocation(), diag::err_regparm_mismatch) 1185 << NewType->getRegParmType() 1186 << OldType->getRegParmType(); 1187 Diag(Old->getLocation(), diag::note_previous_declaration); 1188 return true; 1189 } 1190 1191 NewQType = Context.getRegParmType(NewQType, OldType->getRegParmType()); 1192 New->setType(NewQType); 1193 assert(NewQType.isCanonical()); 1194 } 1195 1196 if (getLangOptions().CPlusPlus) { 1197 // (C++98 13.1p2): 1198 // Certain function declarations cannot be overloaded: 1199 // -- Function declarations that differ only in the return type 1200 // cannot be overloaded. 1201 QualType OldReturnType 1202 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1203 QualType NewReturnType 1204 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1205 QualType ResQT; 1206 if (OldReturnType != NewReturnType) { 1207 if (NewReturnType->isObjCObjectPointerType() 1208 && OldReturnType->isObjCObjectPointerType()) 1209 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1210 if (ResQT.isNull()) { 1211 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1212 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1213 return true; 1214 } 1215 else 1216 NewQType = ResQT; 1217 } 1218 1219 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1220 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1221 if (OldMethod && NewMethod) { 1222 // Preserve triviality. 1223 NewMethod->setTrivial(OldMethod->isTrivial()); 1224 1225 bool isFriend = NewMethod->getFriendObjectKind(); 1226 1227 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) { 1228 // -- Member function declarations with the same name and the 1229 // same parameter types cannot be overloaded if any of them 1230 // is a static member function declaration. 1231 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1232 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1233 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1234 return true; 1235 } 1236 1237 // C++ [class.mem]p1: 1238 // [...] A member shall not be declared twice in the 1239 // member-specification, except that a nested class or member 1240 // class template can be declared and then later defined. 1241 unsigned NewDiag; 1242 if (isa<CXXConstructorDecl>(OldMethod)) 1243 NewDiag = diag::err_constructor_redeclared; 1244 else if (isa<CXXDestructorDecl>(NewMethod)) 1245 NewDiag = diag::err_destructor_redeclared; 1246 else if (isa<CXXConversionDecl>(NewMethod)) 1247 NewDiag = diag::err_conv_function_redeclared; 1248 else 1249 NewDiag = diag::err_member_redeclared; 1250 1251 Diag(New->getLocation(), NewDiag); 1252 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1253 1254 // Complain if this is an explicit declaration of a special 1255 // member that was initially declared implicitly. 1256 // 1257 // As an exception, it's okay to befriend such methods in order 1258 // to permit the implicit constructor/destructor/operator calls. 1259 } else if (OldMethod->isImplicit()) { 1260 if (isFriend) { 1261 NewMethod->setImplicit(); 1262 } else { 1263 Diag(NewMethod->getLocation(), 1264 diag::err_definition_of_implicitly_declared_member) 1265 << New << getSpecialMember(OldMethod); 1266 return true; 1267 } 1268 } 1269 } 1270 1271 // (C++98 8.3.5p3): 1272 // All declarations for a function shall agree exactly in both the 1273 // return type and the parameter-type-list. 1274 // attributes should be ignored when comparing. 1275 if (Context.getNoReturnType(OldQType, false) == 1276 Context.getNoReturnType(NewQType, false)) 1277 return MergeCompatibleFunctionDecls(New, Old); 1278 1279 // Fall through for conflicting redeclarations and redefinitions. 1280 } 1281 1282 // C: Function types need to be compatible, not identical. This handles 1283 // duplicate function decls like "void f(int); void f(enum X);" properly. 1284 if (!getLangOptions().CPlusPlus && 1285 Context.typesAreCompatible(OldQType, NewQType)) { 1286 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1287 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1288 const FunctionProtoType *OldProto = 0; 1289 if (isa<FunctionNoProtoType>(NewFuncType) && 1290 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1291 // The old declaration provided a function prototype, but the 1292 // new declaration does not. Merge in the prototype. 1293 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1294 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1295 OldProto->arg_type_end()); 1296 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1297 ParamTypes.data(), ParamTypes.size(), 1298 OldProto->isVariadic(), 1299 OldProto->getTypeQuals(), 1300 false, false, 0, 0, 1301 OldProto->getExtInfo()); 1302 New->setType(NewQType); 1303 New->setHasInheritedPrototype(); 1304 1305 // Synthesize a parameter for each argument type. 1306 llvm::SmallVector<ParmVarDecl*, 16> Params; 1307 for (FunctionProtoType::arg_type_iterator 1308 ParamType = OldProto->arg_type_begin(), 1309 ParamEnd = OldProto->arg_type_end(); 1310 ParamType != ParamEnd; ++ParamType) { 1311 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1312 SourceLocation(), 0, 1313 *ParamType, /*TInfo=*/0, 1314 SC_None, SC_None, 1315 0); 1316 Param->setImplicit(); 1317 Params.push_back(Param); 1318 } 1319 1320 New->setParams(Params.data(), Params.size()); 1321 } 1322 1323 return MergeCompatibleFunctionDecls(New, Old); 1324 } 1325 1326 // GNU C permits a K&R definition to follow a prototype declaration 1327 // if the declared types of the parameters in the K&R definition 1328 // match the types in the prototype declaration, even when the 1329 // promoted types of the parameters from the K&R definition differ 1330 // from the types in the prototype. GCC then keeps the types from 1331 // the prototype. 1332 // 1333 // If a variadic prototype is followed by a non-variadic K&R definition, 1334 // the K&R definition becomes variadic. This is sort of an edge case, but 1335 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1336 // C99 6.9.1p8. 1337 if (!getLangOptions().CPlusPlus && 1338 Old->hasPrototype() && !New->hasPrototype() && 1339 New->getType()->getAs<FunctionProtoType>() && 1340 Old->getNumParams() == New->getNumParams()) { 1341 llvm::SmallVector<QualType, 16> ArgTypes; 1342 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1343 const FunctionProtoType *OldProto 1344 = Old->getType()->getAs<FunctionProtoType>(); 1345 const FunctionProtoType *NewProto 1346 = New->getType()->getAs<FunctionProtoType>(); 1347 1348 // Determine whether this is the GNU C extension. 1349 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1350 NewProto->getResultType()); 1351 bool LooseCompatible = !MergedReturn.isNull(); 1352 for (unsigned Idx = 0, End = Old->getNumParams(); 1353 LooseCompatible && Idx != End; ++Idx) { 1354 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1355 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1356 if (Context.typesAreCompatible(OldParm->getType(), 1357 NewProto->getArgType(Idx))) { 1358 ArgTypes.push_back(NewParm->getType()); 1359 } else if (Context.typesAreCompatible(OldParm->getType(), 1360 NewParm->getType(), 1361 /*CompareUnqualified=*/true)) { 1362 GNUCompatibleParamWarning Warn 1363 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1364 Warnings.push_back(Warn); 1365 ArgTypes.push_back(NewParm->getType()); 1366 } else 1367 LooseCompatible = false; 1368 } 1369 1370 if (LooseCompatible) { 1371 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1372 Diag(Warnings[Warn].NewParm->getLocation(), 1373 diag::ext_param_promoted_not_compatible_with_prototype) 1374 << Warnings[Warn].PromotedType 1375 << Warnings[Warn].OldParm->getType(); 1376 if (Warnings[Warn].OldParm->getLocation().isValid()) 1377 Diag(Warnings[Warn].OldParm->getLocation(), 1378 diag::note_previous_declaration); 1379 } 1380 1381 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1382 ArgTypes.size(), 1383 OldProto->isVariadic(), 0, 1384 false, false, 0, 0, 1385 OldProto->getExtInfo())); 1386 return MergeCompatibleFunctionDecls(New, Old); 1387 } 1388 1389 // Fall through to diagnose conflicting types. 1390 } 1391 1392 // A function that has already been declared has been redeclared or defined 1393 // with a different type- show appropriate diagnostic 1394 if (unsigned BuiltinID = Old->getBuiltinID()) { 1395 // The user has declared a builtin function with an incompatible 1396 // signature. 1397 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1398 // The function the user is redeclaring is a library-defined 1399 // function like 'malloc' or 'printf'. Warn about the 1400 // redeclaration, then pretend that we don't know about this 1401 // library built-in. 1402 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1403 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1404 << Old << Old->getType(); 1405 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1406 Old->setInvalidDecl(); 1407 return false; 1408 } 1409 1410 PrevDiag = diag::note_previous_builtin_declaration; 1411 } 1412 1413 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1414 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1415 return true; 1416} 1417 1418/// \brief Completes the merge of two function declarations that are 1419/// known to be compatible. 1420/// 1421/// This routine handles the merging of attributes and other 1422/// properties of function declarations form the old declaration to 1423/// the new declaration, once we know that New is in fact a 1424/// redeclaration of Old. 1425/// 1426/// \returns false 1427bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1428 // Merge the attributes 1429 MergeDeclAttributes(New, Old, Context); 1430 1431 // Merge the storage class. 1432 if (Old->getStorageClass() != SC_Extern && 1433 Old->getStorageClass() != SC_None) 1434 New->setStorageClass(Old->getStorageClass()); 1435 1436 // Merge "pure" flag. 1437 if (Old->isPure()) 1438 New->setPure(); 1439 1440 // Merge the "deleted" flag. 1441 if (Old->isDeleted()) 1442 New->setDeleted(); 1443 1444 if (getLangOptions().CPlusPlus) 1445 return MergeCXXFunctionDecl(New, Old); 1446 1447 return false; 1448} 1449 1450/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1451/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1452/// situation, merging decls or emitting diagnostics as appropriate. 1453/// 1454/// Tentative definition rules (C99 6.9.2p2) are checked by 1455/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1456/// definitions here, since the initializer hasn't been attached. 1457/// 1458void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1459 // If the new decl is already invalid, don't do any other checking. 1460 if (New->isInvalidDecl()) 1461 return; 1462 1463 // Verify the old decl was also a variable. 1464 VarDecl *Old = 0; 1465 if (!Previous.isSingleResult() || 1466 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1467 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1468 << New->getDeclName(); 1469 Diag(Previous.getRepresentativeDecl()->getLocation(), 1470 diag::note_previous_definition); 1471 return New->setInvalidDecl(); 1472 } 1473 1474 // C++ [class.mem]p1: 1475 // A member shall not be declared twice in the member-specification [...] 1476 // 1477 // Here, we need only consider static data members. 1478 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 1479 Diag(New->getLocation(), diag::err_duplicate_member) 1480 << New->getIdentifier(); 1481 Diag(Old->getLocation(), diag::note_previous_declaration); 1482 New->setInvalidDecl(); 1483 } 1484 1485 MergeDeclAttributes(New, Old, Context); 1486 1487 // Merge the types 1488 QualType MergedT; 1489 if (getLangOptions().CPlusPlus) { 1490 if (Context.hasSameType(New->getType(), Old->getType())) 1491 MergedT = New->getType(); 1492 // C++ [basic.link]p10: 1493 // [...] the types specified by all declarations referring to a given 1494 // object or function shall be identical, except that declarations for an 1495 // array object can specify array types that differ by the presence or 1496 // absence of a major array bound (8.3.4). 1497 else if (Old->getType()->isIncompleteArrayType() && 1498 New->getType()->isArrayType()) { 1499 CanQual<ArrayType> OldArray 1500 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1501 CanQual<ArrayType> NewArray 1502 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1503 if (OldArray->getElementType() == NewArray->getElementType()) 1504 MergedT = New->getType(); 1505 } else if (Old->getType()->isArrayType() && 1506 New->getType()->isIncompleteArrayType()) { 1507 CanQual<ArrayType> OldArray 1508 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1509 CanQual<ArrayType> NewArray 1510 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1511 if (OldArray->getElementType() == NewArray->getElementType()) 1512 MergedT = Old->getType(); 1513 } else if (New->getType()->isObjCObjectPointerType() 1514 && Old->getType()->isObjCObjectPointerType()) { 1515 MergedT = Context.mergeObjCGCQualifiers(New->getType(), Old->getType()); 1516 } 1517 } else { 1518 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1519 } 1520 if (MergedT.isNull()) { 1521 Diag(New->getLocation(), diag::err_redefinition_different_type) 1522 << New->getDeclName(); 1523 Diag(Old->getLocation(), diag::note_previous_definition); 1524 return New->setInvalidDecl(); 1525 } 1526 New->setType(MergedT); 1527 1528 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1529 if (New->getStorageClass() == SC_Static && 1530 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 1531 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1532 Diag(Old->getLocation(), diag::note_previous_definition); 1533 return New->setInvalidDecl(); 1534 } 1535 // C99 6.2.2p4: 1536 // For an identifier declared with the storage-class specifier 1537 // extern in a scope in which a prior declaration of that 1538 // identifier is visible,23) if the prior declaration specifies 1539 // internal or external linkage, the linkage of the identifier at 1540 // the later declaration is the same as the linkage specified at 1541 // the prior declaration. If no prior declaration is visible, or 1542 // if the prior declaration specifies no linkage, then the 1543 // identifier has external linkage. 1544 if (New->hasExternalStorage() && Old->hasLinkage()) 1545 /* Okay */; 1546 else if (New->getStorageClass() != SC_Static && 1547 Old->getStorageClass() == SC_Static) { 1548 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1549 Diag(Old->getLocation(), diag::note_previous_definition); 1550 return New->setInvalidDecl(); 1551 } 1552 1553 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1554 1555 // FIXME: The test for external storage here seems wrong? We still 1556 // need to check for mismatches. 1557 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1558 // Don't complain about out-of-line definitions of static members. 1559 !(Old->getLexicalDeclContext()->isRecord() && 1560 !New->getLexicalDeclContext()->isRecord())) { 1561 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1562 Diag(Old->getLocation(), diag::note_previous_definition); 1563 return New->setInvalidDecl(); 1564 } 1565 1566 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1567 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1568 Diag(Old->getLocation(), diag::note_previous_definition); 1569 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1570 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1571 Diag(Old->getLocation(), diag::note_previous_definition); 1572 } 1573 1574 // C++ doesn't have tentative definitions, so go right ahead and check here. 1575 const VarDecl *Def; 1576 if (getLangOptions().CPlusPlus && 1577 New->isThisDeclarationADefinition() == VarDecl::Definition && 1578 (Def = Old->getDefinition())) { 1579 Diag(New->getLocation(), diag::err_redefinition) 1580 << New->getDeclName(); 1581 Diag(Def->getLocation(), diag::note_previous_definition); 1582 New->setInvalidDecl(); 1583 return; 1584 } 1585 // c99 6.2.2 P4. 1586 // For an identifier declared with the storage-class specifier extern in a 1587 // scope in which a prior declaration of that identifier is visible, if 1588 // the prior declaration specifies internal or external linkage, the linkage 1589 // of the identifier at the later declaration is the same as the linkage 1590 // specified at the prior declaration. 1591 // FIXME. revisit this code. 1592 if (New->hasExternalStorage() && 1593 Old->getLinkage() == InternalLinkage && 1594 New->getDeclContext() == Old->getDeclContext()) 1595 New->setStorageClass(Old->getStorageClass()); 1596 1597 // Keep a chain of previous declarations. 1598 New->setPreviousDeclaration(Old); 1599 1600 // Inherit access appropriately. 1601 New->setAccess(Old->getAccess()); 1602} 1603 1604/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1605/// no declarator (e.g. "struct foo;") is parsed. 1606Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 1607 DeclSpec &DS) { 1608 // FIXME: Error on auto/register at file scope 1609 // FIXME: Error on inline/virtual/explicit 1610 // FIXME: Warn on useless __thread 1611 // FIXME: Warn on useless const/volatile 1612 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1613 // FIXME: Warn on useless attributes 1614 Decl *TagD = 0; 1615 TagDecl *Tag = 0; 1616 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1617 DS.getTypeSpecType() == DeclSpec::TST_struct || 1618 DS.getTypeSpecType() == DeclSpec::TST_union || 1619 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1620 TagD = DS.getRepAsDecl(); 1621 1622 if (!TagD) // We probably had an error 1623 return 0; 1624 1625 // Note that the above type specs guarantee that the 1626 // type rep is a Decl, whereas in many of the others 1627 // it's a Type. 1628 Tag = dyn_cast<TagDecl>(TagD); 1629 } 1630 1631 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1632 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1633 // or incomplete types shall not be restrict-qualified." 1634 if (TypeQuals & DeclSpec::TQ_restrict) 1635 Diag(DS.getRestrictSpecLoc(), 1636 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1637 << DS.getSourceRange(); 1638 } 1639 1640 if (DS.isFriendSpecified()) { 1641 // If we're dealing with a class template decl, assume that the 1642 // template routines are handling it. 1643 if (TagD && isa<ClassTemplateDecl>(TagD)) 1644 return 0; 1645 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1646 } 1647 1648 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1649 ProcessDeclAttributeList(S, Record, DS.getAttributes()); 1650 1651 if (!Record->getDeclName() && Record->isDefinition() && 1652 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1653 if (getLangOptions().CPlusPlus || 1654 Record->getDeclContext()->isRecord()) 1655 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 1656 1657 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1658 << DS.getSourceRange(); 1659 } 1660 1661 // Microsoft allows unnamed struct/union fields. Don't complain 1662 // about them. 1663 // FIXME: Should we support Microsoft's extensions in this area? 1664 if (Record->getDeclName() && getLangOptions().Microsoft) 1665 return Tag; 1666 } 1667 1668 if (getLangOptions().CPlusPlus && 1669 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 1670 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 1671 if (Enum->enumerator_begin() == Enum->enumerator_end() && 1672 !Enum->getIdentifier() && !Enum->isInvalidDecl()) 1673 Diag(Enum->getLocation(), diag::ext_no_declarators) 1674 << DS.getSourceRange(); 1675 1676 if (!DS.isMissingDeclaratorOk() && 1677 DS.getTypeSpecType() != DeclSpec::TST_error) { 1678 // Warn about typedefs of enums without names, since this is an 1679 // extension in both Microsoft and GNU. 1680 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1681 Tag && isa<EnumDecl>(Tag)) { 1682 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1683 << DS.getSourceRange(); 1684 return Tag; 1685 } 1686 1687 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1688 << DS.getSourceRange(); 1689 } 1690 1691 return TagD; 1692} 1693 1694/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 1695/// builds a statement for it and returns it so it is evaluated. 1696StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 1697 StmtResult R; 1698 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 1699 Expr *Exp = DS.getRepAsExpr(); 1700 QualType Ty = Exp->getType(); 1701 if (Ty->isPointerType()) { 1702 do 1703 Ty = Ty->getAs<PointerType>()->getPointeeType(); 1704 while (Ty->isPointerType()); 1705 } 1706 if (Ty->isVariableArrayType()) { 1707 R = ActOnExprStmt(MakeFullExpr(Exp)); 1708 } 1709 } 1710 return R; 1711} 1712 1713/// We are trying to inject an anonymous member into the given scope; 1714/// check if there's an existing declaration that can't be overloaded. 1715/// 1716/// \return true if this is a forbidden redeclaration 1717static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1718 Scope *S, 1719 DeclContext *Owner, 1720 DeclarationName Name, 1721 SourceLocation NameLoc, 1722 unsigned diagnostic) { 1723 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1724 Sema::ForRedeclaration); 1725 if (!SemaRef.LookupName(R, S)) return false; 1726 1727 if (R.getAsSingle<TagDecl>()) 1728 return false; 1729 1730 // Pick a representative declaration. 1731 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1732 assert(PrevDecl && "Expected a non-null Decl"); 1733 1734 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 1735 return false; 1736 1737 SemaRef.Diag(NameLoc, diagnostic) << Name; 1738 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1739 1740 return true; 1741} 1742 1743/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1744/// anonymous struct or union AnonRecord into the owning context Owner 1745/// and scope S. This routine will be invoked just after we realize 1746/// that an unnamed union or struct is actually an anonymous union or 1747/// struct, e.g., 1748/// 1749/// @code 1750/// union { 1751/// int i; 1752/// float f; 1753/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1754/// // f into the surrounding scope.x 1755/// @endcode 1756/// 1757/// This routine is recursive, injecting the names of nested anonymous 1758/// structs/unions into the owning context and scope as well. 1759static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 1760 DeclContext *Owner, 1761 RecordDecl *AnonRecord, 1762 AccessSpecifier AS) { 1763 unsigned diagKind 1764 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1765 : diag::err_anonymous_struct_member_redecl; 1766 1767 bool Invalid = false; 1768 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1769 FEnd = AnonRecord->field_end(); 1770 F != FEnd; ++F) { 1771 if ((*F)->getDeclName()) { 1772 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, (*F)->getDeclName(), 1773 (*F)->getLocation(), diagKind)) { 1774 // C++ [class.union]p2: 1775 // The names of the members of an anonymous union shall be 1776 // distinct from the names of any other entity in the 1777 // scope in which the anonymous union is declared. 1778 Invalid = true; 1779 } else { 1780 // C++ [class.union]p2: 1781 // For the purpose of name lookup, after the anonymous union 1782 // definition, the members of the anonymous union are 1783 // considered to have been defined in the scope in which the 1784 // anonymous union is declared. 1785 Owner->makeDeclVisibleInContext(*F); 1786 S->AddDecl(*F); 1787 SemaRef.IdResolver.AddDecl(*F); 1788 1789 // That includes picking up the appropriate access specifier. 1790 if (AS != AS_none) (*F)->setAccess(AS); 1791 } 1792 } else if (const RecordType *InnerRecordType 1793 = (*F)->getType()->getAs<RecordType>()) { 1794 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1795 if (InnerRecord->isAnonymousStructOrUnion()) 1796 Invalid = Invalid || 1797 InjectAnonymousStructOrUnionMembers(SemaRef, S, Owner, 1798 InnerRecord, AS); 1799 } 1800 } 1801 1802 return Invalid; 1803} 1804 1805/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 1806/// a VarDecl::StorageClass. Any error reporting is up to the caller: 1807/// illegal input values are mapped to SC_None. 1808static StorageClass 1809StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1810 switch (StorageClassSpec) { 1811 case DeclSpec::SCS_unspecified: return SC_None; 1812 case DeclSpec::SCS_extern: return SC_Extern; 1813 case DeclSpec::SCS_static: return SC_Static; 1814 case DeclSpec::SCS_auto: return SC_Auto; 1815 case DeclSpec::SCS_register: return SC_Register; 1816 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 1817 // Illegal SCSs map to None: error reporting is up to the caller. 1818 case DeclSpec::SCS_mutable: // Fall through. 1819 case DeclSpec::SCS_typedef: return SC_None; 1820 } 1821 llvm_unreachable("unknown storage class specifier"); 1822} 1823 1824/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 1825/// a StorageClass. Any error reporting is up to the caller: 1826/// illegal input values are mapped to SC_None. 1827static StorageClass 1828StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1829 switch (StorageClassSpec) { 1830 case DeclSpec::SCS_unspecified: return SC_None; 1831 case DeclSpec::SCS_extern: return SC_Extern; 1832 case DeclSpec::SCS_static: return SC_Static; 1833 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 1834 // Illegal SCSs map to None: error reporting is up to the caller. 1835 case DeclSpec::SCS_auto: // Fall through. 1836 case DeclSpec::SCS_mutable: // Fall through. 1837 case DeclSpec::SCS_register: // Fall through. 1838 case DeclSpec::SCS_typedef: return SC_None; 1839 } 1840 llvm_unreachable("unknown storage class specifier"); 1841} 1842 1843/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1844/// anonymous structure or union. Anonymous unions are a C++ feature 1845/// (C++ [class.union]) and a GNU C extension; anonymous structures 1846/// are a GNU C and GNU C++ extension. 1847Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1848 AccessSpecifier AS, 1849 RecordDecl *Record) { 1850 DeclContext *Owner = Record->getDeclContext(); 1851 1852 // Diagnose whether this anonymous struct/union is an extension. 1853 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1854 Diag(Record->getLocation(), diag::ext_anonymous_union); 1855 else if (!Record->isUnion()) 1856 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1857 1858 // C and C++ require different kinds of checks for anonymous 1859 // structs/unions. 1860 bool Invalid = false; 1861 if (getLangOptions().CPlusPlus) { 1862 const char* PrevSpec = 0; 1863 unsigned DiagID; 1864 // C++ [class.union]p3: 1865 // Anonymous unions declared in a named namespace or in the 1866 // global namespace shall be declared static. 1867 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1868 (isa<TranslationUnitDecl>(Owner) || 1869 (isa<NamespaceDecl>(Owner) && 1870 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1871 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1872 Invalid = true; 1873 1874 // Recover by adding 'static'. 1875 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1876 PrevSpec, DiagID); 1877 } 1878 // C++ [class.union]p3: 1879 // A storage class is not allowed in a declaration of an 1880 // anonymous union in a class scope. 1881 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1882 isa<RecordDecl>(Owner)) { 1883 Diag(DS.getStorageClassSpecLoc(), 1884 diag::err_anonymous_union_with_storage_spec); 1885 Invalid = true; 1886 1887 // Recover by removing the storage specifier. 1888 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1889 PrevSpec, DiagID); 1890 } 1891 1892 // C++ [class.union]p2: 1893 // The member-specification of an anonymous union shall only 1894 // define non-static data members. [Note: nested types and 1895 // functions cannot be declared within an anonymous union. ] 1896 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1897 MemEnd = Record->decls_end(); 1898 Mem != MemEnd; ++Mem) { 1899 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1900 // C++ [class.union]p3: 1901 // An anonymous union shall not have private or protected 1902 // members (clause 11). 1903 assert(FD->getAccess() != AS_none); 1904 if (FD->getAccess() != AS_public) { 1905 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1906 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1907 Invalid = true; 1908 } 1909 1910 if (CheckNontrivialField(FD)) 1911 Invalid = true; 1912 } else if ((*Mem)->isImplicit()) { 1913 // Any implicit members are fine. 1914 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1915 // This is a type that showed up in an 1916 // elaborated-type-specifier inside the anonymous struct or 1917 // union, but which actually declares a type outside of the 1918 // anonymous struct or union. It's okay. 1919 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1920 if (!MemRecord->isAnonymousStructOrUnion() && 1921 MemRecord->getDeclName()) { 1922 // Visual C++ allows type definition in anonymous struct or union. 1923 if (getLangOptions().Microsoft) 1924 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 1925 << (int)Record->isUnion(); 1926 else { 1927 // This is a nested type declaration. 1928 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1929 << (int)Record->isUnion(); 1930 Invalid = true; 1931 } 1932 } 1933 } else if (isa<AccessSpecDecl>(*Mem)) { 1934 // Any access specifier is fine. 1935 } else { 1936 // We have something that isn't a non-static data 1937 // member. Complain about it. 1938 unsigned DK = diag::err_anonymous_record_bad_member; 1939 if (isa<TypeDecl>(*Mem)) 1940 DK = diag::err_anonymous_record_with_type; 1941 else if (isa<FunctionDecl>(*Mem)) 1942 DK = diag::err_anonymous_record_with_function; 1943 else if (isa<VarDecl>(*Mem)) 1944 DK = diag::err_anonymous_record_with_static; 1945 1946 // Visual C++ allows type definition in anonymous struct or union. 1947 if (getLangOptions().Microsoft && 1948 DK == diag::err_anonymous_record_with_type) 1949 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 1950 << (int)Record->isUnion(); 1951 else { 1952 Diag((*Mem)->getLocation(), DK) 1953 << (int)Record->isUnion(); 1954 Invalid = true; 1955 } 1956 } 1957 } 1958 } 1959 1960 if (!Record->isUnion() && !Owner->isRecord()) { 1961 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1962 << (int)getLangOptions().CPlusPlus; 1963 Invalid = true; 1964 } 1965 1966 // Mock up a declarator. 1967 Declarator Dc(DS, Declarator::TypeNameContext); 1968 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 1969 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1970 1971 // Create a declaration for this anonymous struct/union. 1972 NamedDecl *Anon = 0; 1973 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1974 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1975 /*IdentifierInfo=*/0, 1976 Context.getTypeDeclType(Record), 1977 TInfo, 1978 /*BitWidth=*/0, /*Mutable=*/false); 1979 Anon->setAccess(AS); 1980 if (getLangOptions().CPlusPlus) 1981 FieldCollector->Add(cast<FieldDecl>(Anon)); 1982 } else { 1983 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 1984 assert(SCSpec != DeclSpec::SCS_typedef && 1985 "Parser allowed 'typedef' as storage class VarDecl."); 1986 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 1987 if (SCSpec == DeclSpec::SCS_mutable) { 1988 // mutable can only appear on non-static class members, so it's always 1989 // an error here 1990 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1991 Invalid = true; 1992 SC = SC_None; 1993 } 1994 SCSpec = DS.getStorageClassSpecAsWritten(); 1995 VarDecl::StorageClass SCAsWritten 1996 = StorageClassSpecToVarDeclStorageClass(SCSpec); 1997 1998 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1999 /*IdentifierInfo=*/0, 2000 Context.getTypeDeclType(Record), 2001 TInfo, SC, SCAsWritten); 2002 } 2003 Anon->setImplicit(); 2004 2005 // Add the anonymous struct/union object to the current 2006 // context. We'll be referencing this object when we refer to one of 2007 // its members. 2008 Owner->addDecl(Anon); 2009 2010 // Inject the members of the anonymous struct/union into the owning 2011 // context and into the identifier resolver chain for name lookup 2012 // purposes. 2013 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS)) 2014 Invalid = true; 2015 2016 // Mark this as an anonymous struct/union type. Note that we do not 2017 // do this until after we have already checked and injected the 2018 // members of this anonymous struct/union type, because otherwise 2019 // the members could be injected twice: once by DeclContext when it 2020 // builds its lookup table, and once by 2021 // InjectAnonymousStructOrUnionMembers. 2022 Record->setAnonymousStructOrUnion(true); 2023 2024 if (Invalid) 2025 Anon->setInvalidDecl(); 2026 2027 return Anon; 2028} 2029 2030 2031/// GetNameForDeclarator - Determine the full declaration name for the 2032/// given Declarator. 2033DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2034 return GetNameFromUnqualifiedId(D.getName()); 2035} 2036 2037/// \brief Retrieves the declaration name from a parsed unqualified-id. 2038DeclarationNameInfo 2039Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2040 DeclarationNameInfo NameInfo; 2041 NameInfo.setLoc(Name.StartLocation); 2042 2043 switch (Name.getKind()) { 2044 2045 case UnqualifiedId::IK_Identifier: 2046 NameInfo.setName(Name.Identifier); 2047 NameInfo.setLoc(Name.StartLocation); 2048 return NameInfo; 2049 2050 case UnqualifiedId::IK_OperatorFunctionId: 2051 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2052 Name.OperatorFunctionId.Operator)); 2053 NameInfo.setLoc(Name.StartLocation); 2054 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2055 = Name.OperatorFunctionId.SymbolLocations[0]; 2056 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2057 = Name.EndLocation.getRawEncoding(); 2058 return NameInfo; 2059 2060 case UnqualifiedId::IK_LiteralOperatorId: 2061 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2062 Name.Identifier)); 2063 NameInfo.setLoc(Name.StartLocation); 2064 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2065 return NameInfo; 2066 2067 case UnqualifiedId::IK_ConversionFunctionId: { 2068 TypeSourceInfo *TInfo; 2069 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2070 if (Ty.isNull()) 2071 return DeclarationNameInfo(); 2072 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2073 Context.getCanonicalType(Ty))); 2074 NameInfo.setLoc(Name.StartLocation); 2075 NameInfo.setNamedTypeInfo(TInfo); 2076 return NameInfo; 2077 } 2078 2079 case UnqualifiedId::IK_ConstructorName: { 2080 TypeSourceInfo *TInfo; 2081 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2082 if (Ty.isNull()) 2083 return DeclarationNameInfo(); 2084 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2085 Context.getCanonicalType(Ty))); 2086 NameInfo.setLoc(Name.StartLocation); 2087 NameInfo.setNamedTypeInfo(TInfo); 2088 return NameInfo; 2089 } 2090 2091 case UnqualifiedId::IK_ConstructorTemplateId: { 2092 // In well-formed code, we can only have a constructor 2093 // template-id that refers to the current context, so go there 2094 // to find the actual type being constructed. 2095 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2096 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2097 return DeclarationNameInfo(); 2098 2099 // Determine the type of the class being constructed. 2100 QualType CurClassType = Context.getTypeDeclType(CurClass); 2101 2102 // FIXME: Check two things: that the template-id names the same type as 2103 // CurClassType, and that the template-id does not occur when the name 2104 // was qualified. 2105 2106 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2107 Context.getCanonicalType(CurClassType))); 2108 NameInfo.setLoc(Name.StartLocation); 2109 // FIXME: should we retrieve TypeSourceInfo? 2110 NameInfo.setNamedTypeInfo(0); 2111 return NameInfo; 2112 } 2113 2114 case UnqualifiedId::IK_DestructorName: { 2115 TypeSourceInfo *TInfo; 2116 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2117 if (Ty.isNull()) 2118 return DeclarationNameInfo(); 2119 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2120 Context.getCanonicalType(Ty))); 2121 NameInfo.setLoc(Name.StartLocation); 2122 NameInfo.setNamedTypeInfo(TInfo); 2123 return NameInfo; 2124 } 2125 2126 case UnqualifiedId::IK_TemplateId: { 2127 TemplateName TName = Name.TemplateId->Template.get(); 2128 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2129 return Context.getNameForTemplate(TName, TNameLoc); 2130 } 2131 2132 } // switch (Name.getKind()) 2133 2134 assert(false && "Unknown name kind"); 2135 return DeclarationNameInfo(); 2136} 2137 2138/// isNearlyMatchingFunction - Determine whether the C++ functions 2139/// Declaration and Definition are "nearly" matching. This heuristic 2140/// is used to improve diagnostics in the case where an out-of-line 2141/// function definition doesn't match any declaration within 2142/// the class or namespace. 2143static bool isNearlyMatchingFunction(ASTContext &Context, 2144 FunctionDecl *Declaration, 2145 FunctionDecl *Definition) { 2146 if (Declaration->param_size() != Definition->param_size()) 2147 return false; 2148 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2149 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2150 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2151 2152 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 2153 DefParamTy.getNonReferenceType())) 2154 return false; 2155 } 2156 2157 return true; 2158} 2159 2160/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2161/// declarator needs to be rebuilt in the current instantiation. 2162/// Any bits of declarator which appear before the name are valid for 2163/// consideration here. That's specifically the type in the decl spec 2164/// and the base type in any member-pointer chunks. 2165static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2166 DeclarationName Name) { 2167 // The types we specifically need to rebuild are: 2168 // - typenames, typeofs, and decltypes 2169 // - types which will become injected class names 2170 // Of course, we also need to rebuild any type referencing such a 2171 // type. It's safest to just say "dependent", but we call out a 2172 // few cases here. 2173 2174 DeclSpec &DS = D.getMutableDeclSpec(); 2175 switch (DS.getTypeSpecType()) { 2176 case DeclSpec::TST_typename: 2177 case DeclSpec::TST_typeofType: 2178 case DeclSpec::TST_decltype: { 2179 // Grab the type from the parser. 2180 TypeSourceInfo *TSI = 0; 2181 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 2182 if (T.isNull() || !T->isDependentType()) break; 2183 2184 // Make sure there's a type source info. This isn't really much 2185 // of a waste; most dependent types should have type source info 2186 // attached already. 2187 if (!TSI) 2188 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2189 2190 // Rebuild the type in the current instantiation. 2191 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2192 if (!TSI) return true; 2193 2194 // Store the new type back in the decl spec. 2195 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 2196 DS.UpdateTypeRep(LocType); 2197 break; 2198 } 2199 2200 case DeclSpec::TST_typeofExpr: { 2201 Expr *E = DS.getRepAsExpr(); 2202 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 2203 if (Result.isInvalid()) return true; 2204 DS.UpdateExprRep(Result.get()); 2205 break; 2206 } 2207 2208 default: 2209 // Nothing to do for these decl specs. 2210 break; 2211 } 2212 2213 // It doesn't matter what order we do this in. 2214 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2215 DeclaratorChunk &Chunk = D.getTypeObject(I); 2216 2217 // The only type information in the declarator which can come 2218 // before the declaration name is the base type of a member 2219 // pointer. 2220 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2221 continue; 2222 2223 // Rebuild the scope specifier in-place. 2224 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2225 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2226 return true; 2227 } 2228 2229 return false; 2230} 2231 2232Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 2233 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), false); 2234} 2235 2236Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 2237 MultiTemplateParamsArg TemplateParamLists, 2238 bool IsFunctionDefinition) { 2239 // TODO: consider using NameInfo for diagnostic. 2240 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 2241 DeclarationName Name = NameInfo.getName(); 2242 2243 // All of these full declarators require an identifier. If it doesn't have 2244 // one, the ParsedFreeStandingDeclSpec action should be used. 2245 if (!Name) { 2246 if (!D.isInvalidType()) // Reject this if we think it is valid. 2247 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2248 diag::err_declarator_need_ident) 2249 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2250 return 0; 2251 } 2252 2253 // The scope passed in may not be a decl scope. Zip up the scope tree until 2254 // we find one that is. 2255 while ((S->getFlags() & Scope::DeclScope) == 0 || 2256 (S->getFlags() & Scope::TemplateParamScope) != 0) 2257 S = S->getParent(); 2258 2259 DeclContext *DC = CurContext; 2260 if (D.getCXXScopeSpec().isInvalid()) 2261 D.setInvalidType(); 2262 else if (D.getCXXScopeSpec().isSet()) { 2263 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2264 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2265 if (!DC) { 2266 // If we could not compute the declaration context, it's because the 2267 // declaration context is dependent but does not refer to a class, 2268 // class template, or class template partial specialization. Complain 2269 // and return early, to avoid the coming semantic disaster. 2270 Diag(D.getIdentifierLoc(), 2271 diag::err_template_qualified_declarator_no_match) 2272 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2273 << D.getCXXScopeSpec().getRange(); 2274 return 0; 2275 } 2276 2277 bool IsDependentContext = DC->isDependentContext(); 2278 2279 if (!IsDependentContext && 2280 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2281 return 0; 2282 2283 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 2284 Diag(D.getIdentifierLoc(), 2285 diag::err_member_def_undefined_record) 2286 << Name << DC << D.getCXXScopeSpec().getRange(); 2287 D.setInvalidType(); 2288 } 2289 2290 // Check whether we need to rebuild the type of the given 2291 // declaration in the current instantiation. 2292 if (EnteringContext && IsDependentContext && 2293 TemplateParamLists.size() != 0) { 2294 ContextRAII SavedContext(*this, DC); 2295 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 2296 D.setInvalidType(); 2297 } 2298 } 2299 2300 NamedDecl *New; 2301 2302 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 2303 QualType R = TInfo->getType(); 2304 2305 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 2306 ForRedeclaration); 2307 2308 // See if this is a redefinition of a variable in the same scope. 2309 if (!D.getCXXScopeSpec().isSet()) { 2310 bool IsLinkageLookup = false; 2311 2312 // If the declaration we're planning to build will be a function 2313 // or object with linkage, then look for another declaration with 2314 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 2315 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2316 /* Do nothing*/; 2317 else if (R->isFunctionType()) { 2318 if (CurContext->isFunctionOrMethod() || 2319 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2320 IsLinkageLookup = true; 2321 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 2322 IsLinkageLookup = true; 2323 else if (CurContext->getRedeclContext()->isTranslationUnit() && 2324 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2325 IsLinkageLookup = true; 2326 2327 if (IsLinkageLookup) 2328 Previous.clear(LookupRedeclarationWithLinkage); 2329 2330 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 2331 } else { // Something like "int foo::x;" 2332 LookupQualifiedName(Previous, DC); 2333 2334 // Don't consider using declarations as previous declarations for 2335 // out-of-line members. 2336 RemoveUsingDecls(Previous); 2337 2338 // C++ 7.3.1.2p2: 2339 // Members (including explicit specializations of templates) of a named 2340 // namespace can also be defined outside that namespace by explicit 2341 // qualification of the name being defined, provided that the entity being 2342 // defined was already declared in the namespace and the definition appears 2343 // after the point of declaration in a namespace that encloses the 2344 // declarations namespace. 2345 // 2346 // Note that we only check the context at this point. We don't yet 2347 // have enough information to make sure that PrevDecl is actually 2348 // the declaration we want to match. For example, given: 2349 // 2350 // class X { 2351 // void f(); 2352 // void f(float); 2353 // }; 2354 // 2355 // void X::f(int) { } // ill-formed 2356 // 2357 // In this case, PrevDecl will point to the overload set 2358 // containing the two f's declared in X, but neither of them 2359 // matches. 2360 2361 // First check whether we named the global scope. 2362 if (isa<TranslationUnitDecl>(DC)) { 2363 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 2364 << Name << D.getCXXScopeSpec().getRange(); 2365 } else { 2366 DeclContext *Cur = CurContext; 2367 while (isa<LinkageSpecDecl>(Cur)) 2368 Cur = Cur->getParent(); 2369 if (!Cur->Encloses(DC)) { 2370 // The qualifying scope doesn't enclose the original declaration. 2371 // Emit diagnostic based on current scope. 2372 SourceLocation L = D.getIdentifierLoc(); 2373 SourceRange R = D.getCXXScopeSpec().getRange(); 2374 if (isa<FunctionDecl>(Cur)) 2375 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 2376 else 2377 Diag(L, diag::err_invalid_declarator_scope) 2378 << Name << cast<NamedDecl>(DC) << R; 2379 D.setInvalidType(); 2380 } 2381 } 2382 } 2383 2384 if (Previous.isSingleResult() && 2385 Previous.getFoundDecl()->isTemplateParameter()) { 2386 // Maybe we will complain about the shadowed template parameter. 2387 if (!D.isInvalidType()) 2388 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2389 Previous.getFoundDecl())) 2390 D.setInvalidType(); 2391 2392 // Just pretend that we didn't see the previous declaration. 2393 Previous.clear(); 2394 } 2395 2396 // In C++, the previous declaration we find might be a tag type 2397 // (class or enum). In this case, the new declaration will hide the 2398 // tag type. Note that this does does not apply if we're declaring a 2399 // typedef (C++ [dcl.typedef]p4). 2400 if (Previous.isSingleTagDecl() && 2401 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2402 Previous.clear(); 2403 2404 bool Redeclaration = false; 2405 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2406 if (TemplateParamLists.size()) { 2407 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2408 return 0; 2409 } 2410 2411 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2412 } else if (R->isFunctionType()) { 2413 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2414 move(TemplateParamLists), 2415 IsFunctionDefinition, Redeclaration); 2416 } else { 2417 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2418 move(TemplateParamLists), 2419 Redeclaration); 2420 } 2421 2422 if (New == 0) 2423 return 0; 2424 2425 // If this has an identifier and is not an invalid redeclaration or 2426 // function template specialization, add it to the scope stack. 2427 if (New->getDeclName() && !(Redeclaration && New->isInvalidDecl())) 2428 PushOnScopeChains(New, S); 2429 2430 return New; 2431} 2432 2433/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2434/// types into constant array types in certain situations which would otherwise 2435/// be errors (for GCC compatibility). 2436static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2437 ASTContext &Context, 2438 bool &SizeIsNegative, 2439 llvm::APSInt &Oversized) { 2440 // This method tries to turn a variable array into a constant 2441 // array even when the size isn't an ICE. This is necessary 2442 // for compatibility with code that depends on gcc's buggy 2443 // constant expression folding, like struct {char x[(int)(char*)2];} 2444 SizeIsNegative = false; 2445 Oversized = 0; 2446 2447 if (T->isDependentType()) 2448 return QualType(); 2449 2450 QualifierCollector Qs; 2451 const Type *Ty = Qs.strip(T); 2452 2453 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2454 QualType Pointee = PTy->getPointeeType(); 2455 QualType FixedType = 2456 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 2457 Oversized); 2458 if (FixedType.isNull()) return FixedType; 2459 FixedType = Context.getPointerType(FixedType); 2460 return Qs.apply(FixedType); 2461 } 2462 2463 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2464 if (!VLATy) 2465 return QualType(); 2466 // FIXME: We should probably handle this case 2467 if (VLATy->getElementType()->isVariablyModifiedType()) 2468 return QualType(); 2469 2470 Expr::EvalResult EvalResult; 2471 if (!VLATy->getSizeExpr() || 2472 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2473 !EvalResult.Val.isInt()) 2474 return QualType(); 2475 2476 // Check whether the array size is negative. 2477 llvm::APSInt &Res = EvalResult.Val.getInt(); 2478 if (Res.isSigned() && Res.isNegative()) { 2479 SizeIsNegative = true; 2480 return QualType(); 2481 } 2482 2483 // Check whether the array is too large to be addressed. 2484 unsigned ActiveSizeBits 2485 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 2486 Res); 2487 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 2488 Oversized = Res; 2489 return QualType(); 2490 } 2491 2492 return Context.getConstantArrayType(VLATy->getElementType(), 2493 Res, ArrayType::Normal, 0); 2494} 2495 2496/// \brief Register the given locally-scoped external C declaration so 2497/// that it can be found later for redeclarations 2498void 2499Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2500 const LookupResult &Previous, 2501 Scope *S) { 2502 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2503 "Decl is not a locally-scoped decl!"); 2504 // Note that we have a locally-scoped external with this name. 2505 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2506 2507 if (!Previous.isSingleResult()) 2508 return; 2509 2510 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2511 2512 // If there was a previous declaration of this variable, it may be 2513 // in our identifier chain. Update the identifier chain with the new 2514 // declaration. 2515 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2516 // The previous declaration was found on the identifer resolver 2517 // chain, so remove it from its scope. 2518 while (S && !S->isDeclScope(PrevDecl)) 2519 S = S->getParent(); 2520 2521 if (S) 2522 S->RemoveDecl(PrevDecl); 2523 } 2524} 2525 2526/// \brief Diagnose function specifiers on a declaration of an identifier that 2527/// does not identify a function. 2528void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2529 // FIXME: We should probably indicate the identifier in question to avoid 2530 // confusion for constructs like "inline int a(), b;" 2531 if (D.getDeclSpec().isInlineSpecified()) 2532 Diag(D.getDeclSpec().getInlineSpecLoc(), 2533 diag::err_inline_non_function); 2534 2535 if (D.getDeclSpec().isVirtualSpecified()) 2536 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2537 diag::err_virtual_non_function); 2538 2539 if (D.getDeclSpec().isExplicitSpecified()) 2540 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2541 diag::err_explicit_non_function); 2542} 2543 2544NamedDecl* 2545Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2546 QualType R, TypeSourceInfo *TInfo, 2547 LookupResult &Previous, bool &Redeclaration) { 2548 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2549 if (D.getCXXScopeSpec().isSet()) { 2550 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2551 << D.getCXXScopeSpec().getRange(); 2552 D.setInvalidType(); 2553 // Pretend we didn't see the scope specifier. 2554 DC = CurContext; 2555 Previous.clear(); 2556 } 2557 2558 if (getLangOptions().CPlusPlus) { 2559 // Check that there are no default arguments (C++ only). 2560 CheckExtraCXXDefaultArguments(D); 2561 } 2562 2563 DiagnoseFunctionSpecifiers(D); 2564 2565 if (D.getDeclSpec().isThreadSpecified()) 2566 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2567 2568 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 2569 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 2570 << D.getName().getSourceRange(); 2571 return 0; 2572 } 2573 2574 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2575 if (!NewTD) return 0; 2576 2577 // Handle attributes prior to checking for duplicates in MergeVarDecl 2578 ProcessDeclAttributes(S, NewTD, D); 2579 2580 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2581 // then it shall have block scope. 2582 // Note that variably modified types must be fixed before merging the decl so 2583 // that redeclarations will match. 2584 QualType T = NewTD->getUnderlyingType(); 2585 if (T->isVariablyModifiedType()) { 2586 getCurFunction()->setHasBranchProtectedScope(); 2587 2588 if (S->getFnParent() == 0) { 2589 bool SizeIsNegative; 2590 llvm::APSInt Oversized; 2591 QualType FixedTy = 2592 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 2593 Oversized); 2594 if (!FixedTy.isNull()) { 2595 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2596 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2597 } else { 2598 if (SizeIsNegative) 2599 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2600 else if (T->isVariableArrayType()) 2601 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2602 else if (Oversized.getBoolValue()) 2603 Diag(D.getIdentifierLoc(), diag::err_array_too_large) 2604 << Oversized.toString(10); 2605 else 2606 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2607 NewTD->setInvalidDecl(); 2608 } 2609 } 2610 } 2611 2612 // Merge the decl with the existing one if appropriate. If the decl is 2613 // in an outer scope, it isn't the same thing. 2614 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2615 if (!Previous.empty()) { 2616 Redeclaration = true; 2617 MergeTypeDefDecl(NewTD, Previous); 2618 } 2619 2620 // If this is the C FILE type, notify the AST context. 2621 if (IdentifierInfo *II = NewTD->getIdentifier()) 2622 if (!NewTD->isInvalidDecl() && 2623 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 2624 if (II->isStr("FILE")) 2625 Context.setFILEDecl(NewTD); 2626 else if (II->isStr("jmp_buf")) 2627 Context.setjmp_bufDecl(NewTD); 2628 else if (II->isStr("sigjmp_buf")) 2629 Context.setsigjmp_bufDecl(NewTD); 2630 } 2631 2632 return NewTD; 2633} 2634 2635/// \brief Determines whether the given declaration is an out-of-scope 2636/// previous declaration. 2637/// 2638/// This routine should be invoked when name lookup has found a 2639/// previous declaration (PrevDecl) that is not in the scope where a 2640/// new declaration by the same name is being introduced. If the new 2641/// declaration occurs in a local scope, previous declarations with 2642/// linkage may still be considered previous declarations (C99 2643/// 6.2.2p4-5, C++ [basic.link]p6). 2644/// 2645/// \param PrevDecl the previous declaration found by name 2646/// lookup 2647/// 2648/// \param DC the context in which the new declaration is being 2649/// declared. 2650/// 2651/// \returns true if PrevDecl is an out-of-scope previous declaration 2652/// for a new delcaration with the same name. 2653static bool 2654isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2655 ASTContext &Context) { 2656 if (!PrevDecl) 2657 return false; 2658 2659 if (!PrevDecl->hasLinkage()) 2660 return false; 2661 2662 if (Context.getLangOptions().CPlusPlus) { 2663 // C++ [basic.link]p6: 2664 // If there is a visible declaration of an entity with linkage 2665 // having the same name and type, ignoring entities declared 2666 // outside the innermost enclosing namespace scope, the block 2667 // scope declaration declares that same entity and receives the 2668 // linkage of the previous declaration. 2669 DeclContext *OuterContext = DC->getRedeclContext(); 2670 if (!OuterContext->isFunctionOrMethod()) 2671 // This rule only applies to block-scope declarations. 2672 return false; 2673 2674 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2675 if (PrevOuterContext->isRecord()) 2676 // We found a member function: ignore it. 2677 return false; 2678 2679 // Find the innermost enclosing namespace for the new and 2680 // previous declarations. 2681 OuterContext = OuterContext->getEnclosingNamespaceContext(); 2682 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 2683 2684 // The previous declaration is in a different namespace, so it 2685 // isn't the same function. 2686 if (!OuterContext->Equals(PrevOuterContext)) 2687 return false; 2688 } 2689 2690 return true; 2691} 2692 2693static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 2694 CXXScopeSpec &SS = D.getCXXScopeSpec(); 2695 if (!SS.isSet()) return; 2696 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()), 2697 SS.getRange()); 2698} 2699 2700NamedDecl* 2701Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2702 QualType R, TypeSourceInfo *TInfo, 2703 LookupResult &Previous, 2704 MultiTemplateParamsArg TemplateParamLists, 2705 bool &Redeclaration) { 2706 DeclarationName Name = GetNameForDeclarator(D).getName(); 2707 2708 // Check that there are no default arguments (C++ only). 2709 if (getLangOptions().CPlusPlus) 2710 CheckExtraCXXDefaultArguments(D); 2711 2712 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 2713 assert(SCSpec != DeclSpec::SCS_typedef && 2714 "Parser allowed 'typedef' as storage class VarDecl."); 2715 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2716 if (SCSpec == DeclSpec::SCS_mutable) { 2717 // mutable can only appear on non-static class members, so it's always 2718 // an error here 2719 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2720 D.setInvalidType(); 2721 SC = SC_None; 2722 } 2723 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 2724 VarDecl::StorageClass SCAsWritten 2725 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2726 2727 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2728 if (!II) { 2729 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2730 << Name.getAsString(); 2731 return 0; 2732 } 2733 2734 DiagnoseFunctionSpecifiers(D); 2735 2736 if (!DC->isRecord() && S->getFnParent() == 0) { 2737 // C99 6.9p2: The storage-class specifiers auto and register shall not 2738 // appear in the declaration specifiers in an external declaration. 2739 if (SC == SC_Auto || SC == SC_Register) { 2740 2741 // If this is a register variable with an asm label specified, then this 2742 // is a GNU extension. 2743 if (SC == SC_Register && D.getAsmLabel()) 2744 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2745 else 2746 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2747 D.setInvalidType(); 2748 } 2749 } 2750 if (DC->isRecord() && !CurContext->isRecord()) { 2751 // This is an out-of-line definition of a static data member. 2752 if (SC == SC_Static) { 2753 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2754 diag::err_static_out_of_line) 2755 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2756 } else if (SC == SC_None) 2757 SC = SC_Static; 2758 } 2759 if (SC == SC_Static) { 2760 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2761 if (RD->isLocalClass()) 2762 Diag(D.getIdentifierLoc(), 2763 diag::err_static_data_member_not_allowed_in_local_class) 2764 << Name << RD->getDeclName(); 2765 } 2766 } 2767 2768 // Match up the template parameter lists with the scope specifier, then 2769 // determine whether we have a template or a template specialization. 2770 bool isExplicitSpecialization = false; 2771 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 2772 bool Invalid = false; 2773 if (TemplateParameterList *TemplateParams 2774 = MatchTemplateParametersToScopeSpecifier( 2775 D.getDeclSpec().getSourceRange().getBegin(), 2776 D.getCXXScopeSpec(), 2777 (TemplateParameterList**)TemplateParamLists.get(), 2778 TemplateParamLists.size(), 2779 /*never a friend*/ false, 2780 isExplicitSpecialization, 2781 Invalid)) { 2782 // All but one template parameter lists have been matching. 2783 --NumMatchedTemplateParamLists; 2784 2785 if (TemplateParams->size() > 0) { 2786 // There is no such thing as a variable template. 2787 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2788 << II 2789 << SourceRange(TemplateParams->getTemplateLoc(), 2790 TemplateParams->getRAngleLoc()); 2791 return 0; 2792 } else { 2793 // There is an extraneous 'template<>' for this variable. Complain 2794 // about it, but allow the declaration of the variable. 2795 Diag(TemplateParams->getTemplateLoc(), 2796 diag::err_template_variable_noparams) 2797 << II 2798 << SourceRange(TemplateParams->getTemplateLoc(), 2799 TemplateParams->getRAngleLoc()); 2800 2801 isExplicitSpecialization = true; 2802 } 2803 } 2804 2805 VarDecl *NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2806 II, R, TInfo, SC, SCAsWritten); 2807 2808 if (D.isInvalidType() || Invalid) 2809 NewVD->setInvalidDecl(); 2810 2811 SetNestedNameSpecifier(NewVD, D); 2812 2813 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 2814 NewVD->setTemplateParameterListsInfo(Context, 2815 NumMatchedTemplateParamLists, 2816 (TemplateParameterList**)TemplateParamLists.release()); 2817 } 2818 2819 if (D.getDeclSpec().isThreadSpecified()) { 2820 if (NewVD->hasLocalStorage()) 2821 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2822 else if (!Context.Target.isTLSSupported()) 2823 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2824 else 2825 NewVD->setThreadSpecified(true); 2826 } 2827 2828 // Set the lexical context. If the declarator has a C++ scope specifier, the 2829 // lexical context will be different from the semantic context. 2830 NewVD->setLexicalDeclContext(CurContext); 2831 2832 // Handle attributes prior to checking for duplicates in MergeVarDecl 2833 ProcessDeclAttributes(S, NewVD, D); 2834 2835 // Handle GNU asm-label extension (encoded as an attribute). 2836 if (Expr *E = (Expr*) D.getAsmLabel()) { 2837 // The parser guarantees this is a string. 2838 StringLiteral *SE = cast<StringLiteral>(E); 2839 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 2840 Context, SE->getString())); 2841 } 2842 2843 // Diagnose shadowed variables before filtering for scope. 2844 if (!D.getCXXScopeSpec().isSet()) 2845 CheckShadow(S, NewVD, Previous); 2846 2847 // Don't consider existing declarations that are in a different 2848 // scope and are out-of-semantic-context declarations (if the new 2849 // declaration has linkage). 2850 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2851 2852 // Merge the decl with the existing one if appropriate. 2853 if (!Previous.empty()) { 2854 if (Previous.isSingleResult() && 2855 isa<FieldDecl>(Previous.getFoundDecl()) && 2856 D.getCXXScopeSpec().isSet()) { 2857 // The user tried to define a non-static data member 2858 // out-of-line (C++ [dcl.meaning]p1). 2859 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2860 << D.getCXXScopeSpec().getRange(); 2861 Previous.clear(); 2862 NewVD->setInvalidDecl(); 2863 } 2864 } else if (D.getCXXScopeSpec().isSet()) { 2865 // No previous declaration in the qualifying scope. 2866 Diag(D.getIdentifierLoc(), diag::err_no_member) 2867 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2868 << D.getCXXScopeSpec().getRange(); 2869 NewVD->setInvalidDecl(); 2870 } 2871 2872 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2873 2874 // This is an explicit specialization of a static data member. Check it. 2875 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2876 CheckMemberSpecialization(NewVD, Previous)) 2877 NewVD->setInvalidDecl(); 2878 2879 // attributes declared post-definition are currently ignored 2880 // FIXME: This should be handled in attribute merging, not 2881 // here. 2882 if (Previous.isSingleResult()) { 2883 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2884 if (Def && (Def = Def->getDefinition()) && 2885 Def != NewVD && D.hasAttributes()) { 2886 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2887 Diag(Def->getLocation(), diag::note_previous_definition); 2888 } 2889 } 2890 2891 // If this is a locally-scoped extern C variable, update the map of 2892 // such variables. 2893 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2894 !NewVD->isInvalidDecl()) 2895 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2896 2897 // If there's a #pragma GCC visibility in scope, and this isn't a class 2898 // member, set the visibility of this variable. 2899 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 2900 AddPushedVisibilityAttribute(NewVD); 2901 2902 MarkUnusedFileScopedDecl(NewVD); 2903 2904 return NewVD; 2905} 2906 2907/// \brief Diagnose variable or built-in function shadowing. Implements 2908/// -Wshadow. 2909/// 2910/// This method is called whenever a VarDecl is added to a "useful" 2911/// scope. 2912/// 2913/// \param S the scope in which the shadowing name is being declared 2914/// \param R the lookup of the name 2915/// 2916void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 2917 // Return if warning is ignored. 2918 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow) == Diagnostic::Ignored) 2919 return; 2920 2921 // Don't diagnose declarations at file scope. The scope might not 2922 // have a DeclContext if (e.g.) we're parsing a function prototype. 2923 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity()); 2924 if (NewDC && NewDC->isFileContext()) 2925 return; 2926 2927 // Only diagnose if we're shadowing an unambiguous field or variable. 2928 if (R.getResultKind() != LookupResult::Found) 2929 return; 2930 2931 NamedDecl* ShadowedDecl = R.getFoundDecl(); 2932 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 2933 return; 2934 2935 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 2936 2937 // Only warn about certain kinds of shadowing for class members. 2938 if (NewDC && NewDC->isRecord()) { 2939 // In particular, don't warn about shadowing non-class members. 2940 if (!OldDC->isRecord()) 2941 return; 2942 2943 // TODO: should we warn about static data members shadowing 2944 // static data members from base classes? 2945 2946 // TODO: don't diagnose for inaccessible shadowed members. 2947 // This is hard to do perfectly because we might friend the 2948 // shadowing context, but that's just a false negative. 2949 } 2950 2951 // Determine what kind of declaration we're shadowing. 2952 unsigned Kind; 2953 if (isa<RecordDecl>(OldDC)) { 2954 if (isa<FieldDecl>(ShadowedDecl)) 2955 Kind = 3; // field 2956 else 2957 Kind = 2; // static data member 2958 } else if (OldDC->isFileContext()) 2959 Kind = 1; // global 2960 else 2961 Kind = 0; // local 2962 2963 DeclarationName Name = R.getLookupName(); 2964 2965 // Emit warning and note. 2966 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 2967 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 2968} 2969 2970/// \brief Check -Wshadow without the advantage of a previous lookup. 2971void Sema::CheckShadow(Scope *S, VarDecl *D) { 2972 LookupResult R(*this, D->getDeclName(), D->getLocation(), 2973 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 2974 LookupName(R, S); 2975 CheckShadow(S, D, R); 2976} 2977 2978/// \brief Perform semantic checking on a newly-created variable 2979/// declaration. 2980/// 2981/// This routine performs all of the type-checking required for a 2982/// variable declaration once it has been built. It is used both to 2983/// check variables after they have been parsed and their declarators 2984/// have been translated into a declaration, and to check variables 2985/// that have been instantiated from a template. 2986/// 2987/// Sets NewVD->isInvalidDecl() if an error was encountered. 2988void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2989 LookupResult &Previous, 2990 bool &Redeclaration) { 2991 // If the decl is already known invalid, don't check it. 2992 if (NewVD->isInvalidDecl()) 2993 return; 2994 2995 QualType T = NewVD->getType(); 2996 2997 if (T->isObjCObjectType()) { 2998 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2999 return NewVD->setInvalidDecl(); 3000 } 3001 3002 // Emit an error if an address space was applied to decl with local storage. 3003 // This includes arrays of objects with address space qualifiers, but not 3004 // automatic variables that point to other address spaces. 3005 // ISO/IEC TR 18037 S5.1.2 3006 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 3007 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 3008 return NewVD->setInvalidDecl(); 3009 } 3010 3011 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 3012 && !NewVD->hasAttr<BlocksAttr>()) 3013 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 3014 3015 bool isVM = T->isVariablyModifiedType(); 3016 if (isVM || NewVD->hasAttr<CleanupAttr>() || 3017 NewVD->hasAttr<BlocksAttr>()) 3018 getCurFunction()->setHasBranchProtectedScope(); 3019 3020 if ((isVM && NewVD->hasLinkage()) || 3021 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 3022 bool SizeIsNegative; 3023 llvm::APSInt Oversized; 3024 QualType FixedTy = 3025 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3026 Oversized); 3027 3028 if (FixedTy.isNull() && T->isVariableArrayType()) { 3029 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 3030 // FIXME: This won't give the correct result for 3031 // int a[10][n]; 3032 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 3033 3034 if (NewVD->isFileVarDecl()) 3035 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 3036 << SizeRange; 3037 else if (NewVD->getStorageClass() == SC_Static) 3038 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 3039 << SizeRange; 3040 else 3041 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 3042 << SizeRange; 3043 return NewVD->setInvalidDecl(); 3044 } 3045 3046 if (FixedTy.isNull()) { 3047 if (NewVD->isFileVarDecl()) 3048 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 3049 else 3050 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 3051 return NewVD->setInvalidDecl(); 3052 } 3053 3054 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 3055 NewVD->setType(FixedTy); 3056 } 3057 3058 if (Previous.empty() && NewVD->isExternC()) { 3059 // Since we did not find anything by this name and we're declaring 3060 // an extern "C" variable, look for a non-visible extern "C" 3061 // declaration with the same name. 3062 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3063 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 3064 if (Pos != LocallyScopedExternalDecls.end()) 3065 Previous.addDecl(Pos->second); 3066 } 3067 3068 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 3069 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 3070 << T; 3071 return NewVD->setInvalidDecl(); 3072 } 3073 3074 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 3075 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 3076 return NewVD->setInvalidDecl(); 3077 } 3078 3079 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 3080 Diag(NewVD->getLocation(), diag::err_block_on_vm); 3081 return NewVD->setInvalidDecl(); 3082 } 3083 3084 // Function pointers and references cannot have qualified function type, only 3085 // function pointer-to-members can do that. 3086 QualType Pointee; 3087 unsigned PtrOrRef = 0; 3088 if (const PointerType *Ptr = T->getAs<PointerType>()) 3089 Pointee = Ptr->getPointeeType(); 3090 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 3091 Pointee = Ref->getPointeeType(); 3092 PtrOrRef = 1; 3093 } 3094 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 3095 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 3096 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 3097 << PtrOrRef; 3098 return NewVD->setInvalidDecl(); 3099 } 3100 3101 if (!Previous.empty()) { 3102 Redeclaration = true; 3103 MergeVarDecl(NewVD, Previous); 3104 } 3105} 3106 3107/// \brief Data used with FindOverriddenMethod 3108struct FindOverriddenMethodData { 3109 Sema *S; 3110 CXXMethodDecl *Method; 3111}; 3112 3113/// \brief Member lookup function that determines whether a given C++ 3114/// method overrides a method in a base class, to be used with 3115/// CXXRecordDecl::lookupInBases(). 3116static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 3117 CXXBasePath &Path, 3118 void *UserData) { 3119 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3120 3121 FindOverriddenMethodData *Data 3122 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 3123 3124 DeclarationName Name = Data->Method->getDeclName(); 3125 3126 // FIXME: Do we care about other names here too? 3127 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3128 // We really want to find the base class destructor here. 3129 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 3130 CanQualType CT = Data->S->Context.getCanonicalType(T); 3131 3132 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 3133 } 3134 3135 for (Path.Decls = BaseRecord->lookup(Name); 3136 Path.Decls.first != Path.Decls.second; 3137 ++Path.Decls.first) { 3138 NamedDecl *D = *Path.Decls.first; 3139 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3140 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 3141 return true; 3142 } 3143 } 3144 3145 return false; 3146} 3147 3148/// AddOverriddenMethods - See if a method overrides any in the base classes, 3149/// and if so, check that it's a valid override and remember it. 3150void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 3151 // Look for virtual methods in base classes that this method might override. 3152 CXXBasePaths Paths; 3153 FindOverriddenMethodData Data; 3154 Data.Method = MD; 3155 Data.S = this; 3156 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 3157 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 3158 E = Paths.found_decls_end(); I != E; ++I) { 3159 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 3160 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 3161 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 3162 !CheckOverridingFunctionAttributes(MD, OldMD)) 3163 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 3164 } 3165 } 3166 } 3167} 3168 3169NamedDecl* 3170Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3171 QualType R, TypeSourceInfo *TInfo, 3172 LookupResult &Previous, 3173 MultiTemplateParamsArg TemplateParamLists, 3174 bool IsFunctionDefinition, bool &Redeclaration) { 3175 assert(R.getTypePtr()->isFunctionType()); 3176 3177 // TODO: consider using NameInfo for diagnostic. 3178 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3179 DeclarationName Name = NameInfo.getName(); 3180 FunctionDecl::StorageClass SC = SC_None; 3181 switch (D.getDeclSpec().getStorageClassSpec()) { 3182 default: assert(0 && "Unknown storage class!"); 3183 case DeclSpec::SCS_auto: 3184 case DeclSpec::SCS_register: 3185 case DeclSpec::SCS_mutable: 3186 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3187 diag::err_typecheck_sclass_func); 3188 D.setInvalidType(); 3189 break; 3190 case DeclSpec::SCS_unspecified: SC = SC_None; break; 3191 case DeclSpec::SCS_extern: SC = SC_Extern; break; 3192 case DeclSpec::SCS_static: { 3193 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 3194 // C99 6.7.1p5: 3195 // The declaration of an identifier for a function that has 3196 // block scope shall have no explicit storage-class specifier 3197 // other than extern 3198 // See also (C++ [dcl.stc]p4). 3199 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3200 diag::err_static_block_func); 3201 SC = SC_None; 3202 } else 3203 SC = SC_Static; 3204 break; 3205 } 3206 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 3207 } 3208 3209 if (D.getDeclSpec().isThreadSpecified()) 3210 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3211 3212 bool isFriend = D.getDeclSpec().isFriendSpecified(); 3213 bool isInline = D.getDeclSpec().isInlineSpecified(); 3214 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3215 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 3216 3217 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3218 FunctionDecl::StorageClass SCAsWritten 3219 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 3220 3221 // Check that the return type is not an abstract class type. 3222 // For record types, this is done by the AbstractClassUsageDiagnoser once 3223 // the class has been completely parsed. 3224 if (!DC->isRecord() && 3225 RequireNonAbstractType(D.getIdentifierLoc(), 3226 R->getAs<FunctionType>()->getResultType(), 3227 diag::err_abstract_type_in_decl, 3228 AbstractReturnType)) 3229 D.setInvalidType(); 3230 3231 // Do not allow returning a objc interface by-value. 3232 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 3233 Diag(D.getIdentifierLoc(), 3234 diag::err_object_cannot_be_passed_returned_by_value) << 0 3235 << R->getAs<FunctionType>()->getResultType(); 3236 D.setInvalidType(); 3237 } 3238 3239 bool isVirtualOkay = false; 3240 FunctionDecl *NewFD; 3241 3242 if (isFriend) { 3243 // C++ [class.friend]p5 3244 // A function can be defined in a friend declaration of a 3245 // class . . . . Such a function is implicitly inline. 3246 isInline |= IsFunctionDefinition; 3247 } 3248 3249 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 3250 // This is a C++ constructor declaration. 3251 assert(DC->isRecord() && 3252 "Constructors can only be declared in a member context"); 3253 3254 R = CheckConstructorDeclarator(D, R, SC); 3255 3256 // Create the new declaration 3257 NewFD = CXXConstructorDecl::Create(Context, 3258 cast<CXXRecordDecl>(DC), 3259 NameInfo, R, TInfo, 3260 isExplicit, isInline, 3261 /*isImplicitlyDeclared=*/false); 3262 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3263 // This is a C++ destructor declaration. 3264 if (DC->isRecord()) { 3265 R = CheckDestructorDeclarator(D, R, SC); 3266 3267 NewFD = CXXDestructorDecl::Create(Context, 3268 cast<CXXRecordDecl>(DC), 3269 NameInfo, R, 3270 isInline, 3271 /*isImplicitlyDeclared=*/false); 3272 NewFD->setTypeSourceInfo(TInfo); 3273 3274 isVirtualOkay = true; 3275 } else { 3276 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 3277 3278 // Create a FunctionDecl to satisfy the function definition parsing 3279 // code path. 3280 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 3281 Name, R, TInfo, SC, SCAsWritten, isInline, 3282 /*hasPrototype=*/true); 3283 D.setInvalidType(); 3284 } 3285 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 3286 if (!DC->isRecord()) { 3287 Diag(D.getIdentifierLoc(), 3288 diag::err_conv_function_not_member); 3289 return 0; 3290 } 3291 3292 CheckConversionDeclarator(D, R, SC); 3293 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 3294 NameInfo, R, TInfo, 3295 isInline, isExplicit); 3296 3297 isVirtualOkay = true; 3298 } else if (DC->isRecord()) { 3299 // If the of the function is the same as the name of the record, then this 3300 // must be an invalid constructor that has a return type. 3301 // (The parser checks for a return type and makes the declarator a 3302 // constructor if it has no return type). 3303 // must have an invalid constructor that has a return type 3304 if (Name.getAsIdentifierInfo() && 3305 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 3306 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 3307 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3308 << SourceRange(D.getIdentifierLoc()); 3309 return 0; 3310 } 3311 3312 bool isStatic = SC == SC_Static; 3313 3314 // [class.free]p1: 3315 // Any allocation function for a class T is a static member 3316 // (even if not explicitly declared static). 3317 if (Name.getCXXOverloadedOperator() == OO_New || 3318 Name.getCXXOverloadedOperator() == OO_Array_New) 3319 isStatic = true; 3320 3321 // [class.free]p6 Any deallocation function for a class X is a static member 3322 // (even if not explicitly declared static). 3323 if (Name.getCXXOverloadedOperator() == OO_Delete || 3324 Name.getCXXOverloadedOperator() == OO_Array_Delete) 3325 isStatic = true; 3326 3327 // This is a C++ method declaration. 3328 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 3329 NameInfo, R, TInfo, 3330 isStatic, SCAsWritten, isInline); 3331 3332 isVirtualOkay = !isStatic; 3333 } else { 3334 // Determine whether the function was written with a 3335 // prototype. This true when: 3336 // - we're in C++ (where every function has a prototype), 3337 // - there is a prototype in the declarator, or 3338 // - the type R of the function is some kind of typedef or other reference 3339 // to a type name (which eventually refers to a function type). 3340 bool HasPrototype = 3341 getLangOptions().CPlusPlus || 3342 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 3343 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 3344 3345 NewFD = FunctionDecl::Create(Context, DC, 3346 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 3347 HasPrototype); 3348 } 3349 3350 if (D.isInvalidType()) 3351 NewFD->setInvalidDecl(); 3352 3353 SetNestedNameSpecifier(NewFD, D); 3354 3355 // Set the lexical context. If the declarator has a C++ 3356 // scope specifier, or is the object of a friend declaration, the 3357 // lexical context will be different from the semantic context. 3358 NewFD->setLexicalDeclContext(CurContext); 3359 3360 // Match up the template parameter lists with the scope specifier, then 3361 // determine whether we have a template or a template specialization. 3362 FunctionTemplateDecl *FunctionTemplate = 0; 3363 bool isExplicitSpecialization = false; 3364 bool isFunctionTemplateSpecialization = false; 3365 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 3366 bool Invalid = false; 3367 if (TemplateParameterList *TemplateParams 3368 = MatchTemplateParametersToScopeSpecifier( 3369 D.getDeclSpec().getSourceRange().getBegin(), 3370 D.getCXXScopeSpec(), 3371 (TemplateParameterList**)TemplateParamLists.get(), 3372 TemplateParamLists.size(), 3373 isFriend, 3374 isExplicitSpecialization, 3375 Invalid)) { 3376 // All but one template parameter lists have been matching. 3377 --NumMatchedTemplateParamLists; 3378 3379 if (TemplateParams->size() > 0) { 3380 // This is a function template 3381 3382 // Check that we can declare a template here. 3383 if (CheckTemplateDeclScope(S, TemplateParams)) 3384 return 0; 3385 3386 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 3387 NewFD->getLocation(), 3388 Name, TemplateParams, 3389 NewFD); 3390 FunctionTemplate->setLexicalDeclContext(CurContext); 3391 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 3392 } else { 3393 // This is a function template specialization. 3394 isFunctionTemplateSpecialization = true; 3395 3396 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 3397 if (isFriend && isFunctionTemplateSpecialization) { 3398 // We want to remove the "template<>", found here. 3399 SourceRange RemoveRange = TemplateParams->getSourceRange(); 3400 3401 // If we remove the template<> and the name is not a 3402 // template-id, we're actually silently creating a problem: 3403 // the friend declaration will refer to an untemplated decl, 3404 // and clearly the user wants a template specialization. So 3405 // we need to insert '<>' after the name. 3406 SourceLocation InsertLoc; 3407 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 3408 InsertLoc = D.getName().getSourceRange().getEnd(); 3409 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 3410 } 3411 3412 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 3413 << Name << RemoveRange 3414 << FixItHint::CreateRemoval(RemoveRange) 3415 << FixItHint::CreateInsertion(InsertLoc, "<>"); 3416 } 3417 } 3418 } 3419 3420 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 3421 NewFD->setTemplateParameterListsInfo(Context, 3422 NumMatchedTemplateParamLists, 3423 (TemplateParameterList**)TemplateParamLists.release()); 3424 } 3425 3426 if (Invalid) { 3427 NewFD->setInvalidDecl(); 3428 if (FunctionTemplate) 3429 FunctionTemplate->setInvalidDecl(); 3430 } 3431 3432 // C++ [dcl.fct.spec]p5: 3433 // The virtual specifier shall only be used in declarations of 3434 // nonstatic class member functions that appear within a 3435 // member-specification of a class declaration; see 10.3. 3436 // 3437 if (isVirtual && !NewFD->isInvalidDecl()) { 3438 if (!isVirtualOkay) { 3439 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3440 diag::err_virtual_non_function); 3441 } else if (!CurContext->isRecord()) { 3442 // 'virtual' was specified outside of the class. 3443 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 3444 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 3445 } else { 3446 // Okay: Add virtual to the method. 3447 NewFD->setVirtualAsWritten(true); 3448 } 3449 } 3450 3451 // C++ [dcl.fct.spec]p3: 3452 // The inline specifier shall not appear on a block scope function declaration. 3453 if (isInline && !NewFD->isInvalidDecl() && getLangOptions().CPlusPlus) { 3454 if (CurContext->isFunctionOrMethod()) { 3455 // 'inline' is not allowed on block scope function declaration. 3456 Diag(D.getDeclSpec().getInlineSpecLoc(), 3457 diag::err_inline_declaration_block_scope) << Name 3458 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 3459 } 3460 } 3461 3462 // C++ [dcl.fct.spec]p6: 3463 // The explicit specifier shall be used only in the declaration of a 3464 // constructor or conversion function within its class definition; see 12.3.1 3465 // and 12.3.2. 3466 if (isExplicit && !NewFD->isInvalidDecl()) { 3467 if (!CurContext->isRecord()) { 3468 // 'explicit' was specified outside of the class. 3469 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3470 diag::err_explicit_out_of_class) 3471 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3472 } else if (!isa<CXXConstructorDecl>(NewFD) && 3473 !isa<CXXConversionDecl>(NewFD)) { 3474 // 'explicit' was specified on a function that wasn't a constructor 3475 // or conversion function. 3476 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3477 diag::err_explicit_non_ctor_or_conv_function) 3478 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3479 } 3480 } 3481 3482 // Filter out previous declarations that don't match the scope. 3483 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3484 3485 if (isFriend) { 3486 // DC is the namespace in which the function is being declared. 3487 assert((DC->isFileContext() || !Previous.empty()) && 3488 "previously-undeclared friend function being created " 3489 "in a non-namespace context"); 3490 3491 // For now, claim that the objects have no previous declaration. 3492 if (FunctionTemplate) { 3493 FunctionTemplate->setObjectOfFriendDecl(false); 3494 FunctionTemplate->setAccess(AS_public); 3495 } 3496 NewFD->setObjectOfFriendDecl(false); 3497 NewFD->setAccess(AS_public); 3498 } 3499 3500 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 3501 !CurContext->isRecord()) { 3502 // C++ [class.static]p1: 3503 // A data or function member of a class may be declared static 3504 // in a class definition, in which case it is a static member of 3505 // the class. 3506 3507 // Complain about the 'static' specifier if it's on an out-of-line 3508 // member function definition. 3509 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3510 diag::err_static_out_of_line) 3511 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3512 } 3513 3514 // Handle GNU asm-label extension (encoded as an attribute). 3515 if (Expr *E = (Expr*) D.getAsmLabel()) { 3516 // The parser guarantees this is a string. 3517 StringLiteral *SE = cast<StringLiteral>(E); 3518 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 3519 SE->getString())); 3520 } 3521 3522 // Copy the parameter declarations from the declarator D to the function 3523 // declaration NewFD, if they are available. First scavenge them into Params. 3524 llvm::SmallVector<ParmVarDecl*, 16> Params; 3525 if (D.getNumTypeObjects() > 0) { 3526 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3527 3528 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 3529 // function that takes no arguments, not a function that takes a 3530 // single void argument. 3531 // We let through "const void" here because Sema::GetTypeForDeclarator 3532 // already checks for that case. 3533 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3534 FTI.ArgInfo[0].Param && 3535 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 3536 // Empty arg list, don't push any params. 3537 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 3538 3539 // In C++, the empty parameter-type-list must be spelled "void"; a 3540 // typedef of void is not permitted. 3541 if (getLangOptions().CPlusPlus && 3542 Param->getType().getUnqualifiedType() != Context.VoidTy) 3543 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 3544 // FIXME: Leaks decl? 3545 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 3546 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 3547 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3548 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 3549 Param->setDeclContext(NewFD); 3550 Params.push_back(Param); 3551 3552 if (Param->isInvalidDecl()) 3553 NewFD->setInvalidDecl(); 3554 } 3555 } 3556 3557 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 3558 // When we're declaring a function with a typedef, typeof, etc as in the 3559 // following example, we'll need to synthesize (unnamed) 3560 // parameters for use in the declaration. 3561 // 3562 // @code 3563 // typedef void fn(int); 3564 // fn f; 3565 // @endcode 3566 3567 // Synthesize a parameter for each argument type. 3568 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3569 AE = FT->arg_type_end(); AI != AE; ++AI) { 3570 ParmVarDecl *Param = 3571 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 3572 Params.push_back(Param); 3573 } 3574 } else { 3575 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 3576 "Should not need args for typedef of non-prototype fn"); 3577 } 3578 // Finally, we know we have the right number of parameters, install them. 3579 NewFD->setParams(Params.data(), Params.size()); 3580 3581 // If the declarator is a template-id, translate the parser's template 3582 // argument list into our AST format. 3583 bool HasExplicitTemplateArgs = false; 3584 TemplateArgumentListInfo TemplateArgs; 3585 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3586 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3587 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3588 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3589 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3590 TemplateId->getTemplateArgs(), 3591 TemplateId->NumArgs); 3592 translateTemplateArguments(TemplateArgsPtr, 3593 TemplateArgs); 3594 TemplateArgsPtr.release(); 3595 3596 HasExplicitTemplateArgs = true; 3597 3598 if (FunctionTemplate) { 3599 // FIXME: Diagnose function template with explicit template 3600 // arguments. 3601 HasExplicitTemplateArgs = false; 3602 } else if (!isFunctionTemplateSpecialization && 3603 !D.getDeclSpec().isFriendSpecified()) { 3604 // We have encountered something that the user meant to be a 3605 // specialization (because it has explicitly-specified template 3606 // arguments) but that was not introduced with a "template<>" (or had 3607 // too few of them). 3608 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3609 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3610 << FixItHint::CreateInsertion( 3611 D.getDeclSpec().getSourceRange().getBegin(), 3612 "template<> "); 3613 isFunctionTemplateSpecialization = true; 3614 } else { 3615 // "friend void foo<>(int);" is an implicit specialization decl. 3616 isFunctionTemplateSpecialization = true; 3617 } 3618 } else if (isFriend && isFunctionTemplateSpecialization) { 3619 // This combination is only possible in a recovery case; the user 3620 // wrote something like: 3621 // template <> friend void foo(int); 3622 // which we're recovering from as if the user had written: 3623 // friend void foo<>(int); 3624 // Go ahead and fake up a template id. 3625 HasExplicitTemplateArgs = true; 3626 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 3627 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 3628 } 3629 3630 // If it's a friend (and only if it's a friend), it's possible 3631 // that either the specialized function type or the specialized 3632 // template is dependent, and therefore matching will fail. In 3633 // this case, don't check the specialization yet. 3634 if (isFunctionTemplateSpecialization && isFriend && 3635 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 3636 assert(HasExplicitTemplateArgs && 3637 "friend function specialization without template args"); 3638 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 3639 Previous)) 3640 NewFD->setInvalidDecl(); 3641 } else if (isFunctionTemplateSpecialization) { 3642 if (CheckFunctionTemplateSpecialization(NewFD, 3643 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3644 Previous)) 3645 NewFD->setInvalidDecl(); 3646 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 3647 if (CheckMemberSpecialization(NewFD, Previous)) 3648 NewFD->setInvalidDecl(); 3649 } 3650 3651 // Perform semantic checking on the function declaration. 3652 bool OverloadableAttrRequired = false; // FIXME: HACK! 3653 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3654 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 3655 3656 assert((NewFD->isInvalidDecl() || !Redeclaration || 3657 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3658 "previous declaration set still overloaded"); 3659 3660 NamedDecl *PrincipalDecl = (FunctionTemplate 3661 ? cast<NamedDecl>(FunctionTemplate) 3662 : NewFD); 3663 3664 if (isFriend && Redeclaration) { 3665 AccessSpecifier Access = AS_public; 3666 if (!NewFD->isInvalidDecl()) 3667 Access = NewFD->getPreviousDeclaration()->getAccess(); 3668 3669 NewFD->setAccess(Access); 3670 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 3671 3672 PrincipalDecl->setObjectOfFriendDecl(true); 3673 } 3674 3675 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 3676 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 3677 PrincipalDecl->setNonMemberOperator(); 3678 3679 // If we have a function template, check the template parameter 3680 // list. This will check and merge default template arguments. 3681 if (FunctionTemplate) { 3682 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3683 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3684 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3685 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3686 : TPC_FunctionTemplate); 3687 } 3688 3689 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 3690 // Fake up an access specifier if it's supposed to be a class member. 3691 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext())) 3692 NewFD->setAccess(AS_public); 3693 3694 // An out-of-line member function declaration must also be a 3695 // definition (C++ [dcl.meaning]p1). 3696 // Note that this is not the case for explicit specializations of 3697 // function templates or member functions of class templates, per 3698 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 3699 // for compatibility with old SWIG code which likes to generate them. 3700 if (!IsFunctionDefinition && !isFriend && 3701 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 3702 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 3703 << D.getCXXScopeSpec().getRange(); 3704 } 3705 if (!Redeclaration && !(isFriend && CurContext->isDependentContext())) { 3706 // The user tried to provide an out-of-line definition for a 3707 // function that is a member of a class or namespace, but there 3708 // was no such member function declared (C++ [class.mfct]p2, 3709 // C++ [namespace.memdef]p2). For example: 3710 // 3711 // class X { 3712 // void f() const; 3713 // }; 3714 // 3715 // void X::f() { } // ill-formed 3716 // 3717 // Complain about this problem, and attempt to suggest close 3718 // matches (e.g., those that differ only in cv-qualifiers and 3719 // whether the parameter types are references). 3720 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3721 << Name << DC << D.getCXXScopeSpec().getRange(); 3722 NewFD->setInvalidDecl(); 3723 3724 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 3725 ForRedeclaration); 3726 LookupQualifiedName(Prev, DC); 3727 assert(!Prev.isAmbiguous() && 3728 "Cannot have an ambiguity in previous-declaration lookup"); 3729 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3730 Func != FuncEnd; ++Func) { 3731 if (isa<FunctionDecl>(*Func) && 3732 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 3733 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3734 } 3735 } 3736 } 3737 3738 // Handle attributes. We need to have merged decls when handling attributes 3739 // (for example to check for conflicts, etc). 3740 // FIXME: This needs to happen before we merge declarations. Then, 3741 // let attribute merging cope with attribute conflicts. 3742 ProcessDeclAttributes(S, NewFD, D); 3743 3744 // attributes declared post-definition are currently ignored 3745 // FIXME: This should happen during attribute merging 3746 if (Redeclaration && Previous.isSingleResult()) { 3747 const FunctionDecl *Def; 3748 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3749 if (PrevFD && PrevFD->hasBody(Def) && D.hasAttributes()) { 3750 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3751 Diag(Def->getLocation(), diag::note_previous_definition); 3752 } 3753 } 3754 3755 AddKnownFunctionAttributes(NewFD); 3756 3757 if (OverloadableAttrRequired && !NewFD->hasAttr<OverloadableAttr>()) { 3758 // If a function name is overloadable in C, then every function 3759 // with that name must be marked "overloadable". 3760 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3761 << Redeclaration << NewFD; 3762 if (!Previous.empty()) 3763 Diag(Previous.getRepresentativeDecl()->getLocation(), 3764 diag::note_attribute_overloadable_prev_overload); 3765 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), Context)); 3766 } 3767 3768 if (NewFD->hasAttr<OverloadableAttr>() && 3769 !NewFD->getType()->getAs<FunctionProtoType>()) { 3770 Diag(NewFD->getLocation(), 3771 diag::err_attribute_overloadable_no_prototype) 3772 << NewFD; 3773 3774 // Turn this into a variadic function with no parameters. 3775 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 3776 QualType R = Context.getFunctionType(FT->getResultType(), 3777 0, 0, true, 0, false, false, 0, 0, 3778 FT->getExtInfo()); 3779 NewFD->setType(R); 3780 } 3781 3782 // If there's a #pragma GCC visibility in scope, and this isn't a class 3783 // member, set the visibility of this function. 3784 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3785 AddPushedVisibilityAttribute(NewFD); 3786 3787 // If this is a locally-scoped extern C function, update the 3788 // map of such names. 3789 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3790 && !NewFD->isInvalidDecl()) 3791 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3792 3793 // Set this FunctionDecl's range up to the right paren. 3794 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3795 3796 if (FunctionTemplate && NewFD->isInvalidDecl()) 3797 FunctionTemplate->setInvalidDecl(); 3798 3799 if (FunctionTemplate) 3800 return FunctionTemplate; 3801 3802 MarkUnusedFileScopedDecl(NewFD); 3803 3804 return NewFD; 3805} 3806 3807/// \brief Perform semantic checking of a new function declaration. 3808/// 3809/// Performs semantic analysis of the new function declaration 3810/// NewFD. This routine performs all semantic checking that does not 3811/// require the actual declarator involved in the declaration, and is 3812/// used both for the declaration of functions as they are parsed 3813/// (called via ActOnDeclarator) and for the declaration of functions 3814/// that have been instantiated via C++ template instantiation (called 3815/// via InstantiateDecl). 3816/// 3817/// \param IsExplicitSpecialiation whether this new function declaration is 3818/// an explicit specialization of the previous declaration. 3819/// 3820/// This sets NewFD->isInvalidDecl() to true if there was an error. 3821void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3822 LookupResult &Previous, 3823 bool IsExplicitSpecialization, 3824 bool &Redeclaration, 3825 bool &OverloadableAttrRequired) { 3826 // If NewFD is already known erroneous, don't do any of this checking. 3827 if (NewFD->isInvalidDecl()) { 3828 // If this is a class member, mark the class invalid immediately. 3829 // This avoids some consistency errors later. 3830 if (isa<CXXMethodDecl>(NewFD)) 3831 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl(); 3832 3833 return; 3834 } 3835 3836 if (NewFD->getResultType()->isVariablyModifiedType()) { 3837 // Functions returning a variably modified type violate C99 6.7.5.2p2 3838 // because all functions have linkage. 3839 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3840 return NewFD->setInvalidDecl(); 3841 } 3842 3843 if (NewFD->isMain()) 3844 CheckMain(NewFD); 3845 3846 // Check for a previous declaration of this name. 3847 if (Previous.empty() && NewFD->isExternC()) { 3848 // Since we did not find anything by this name and we're declaring 3849 // an extern "C" function, look for a non-visible extern "C" 3850 // declaration with the same name. 3851 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3852 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3853 if (Pos != LocallyScopedExternalDecls.end()) 3854 Previous.addDecl(Pos->second); 3855 } 3856 3857 // Merge or overload the declaration with an existing declaration of 3858 // the same name, if appropriate. 3859 if (!Previous.empty()) { 3860 // Determine whether NewFD is an overload of PrevDecl or 3861 // a declaration that requires merging. If it's an overload, 3862 // there's no more work to do here; we'll just add the new 3863 // function to the scope. 3864 3865 NamedDecl *OldDecl = 0; 3866 if (!AllowOverloadingOfFunction(Previous, Context)) { 3867 Redeclaration = true; 3868 OldDecl = Previous.getFoundDecl(); 3869 } else { 3870 if (!getLangOptions().CPlusPlus) 3871 OverloadableAttrRequired = true; 3872 3873 switch (CheckOverload(S, NewFD, Previous, OldDecl, 3874 /*NewIsUsingDecl*/ false)) { 3875 case Ovl_Match: 3876 Redeclaration = true; 3877 break; 3878 3879 case Ovl_NonFunction: 3880 Redeclaration = true; 3881 break; 3882 3883 case Ovl_Overload: 3884 Redeclaration = false; 3885 break; 3886 } 3887 } 3888 3889 if (Redeclaration) { 3890 // NewFD and OldDecl represent declarations that need to be 3891 // merged. 3892 if (MergeFunctionDecl(NewFD, OldDecl)) 3893 return NewFD->setInvalidDecl(); 3894 3895 Previous.clear(); 3896 Previous.addDecl(OldDecl); 3897 3898 if (FunctionTemplateDecl *OldTemplateDecl 3899 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3900 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3901 FunctionTemplateDecl *NewTemplateDecl 3902 = NewFD->getDescribedFunctionTemplate(); 3903 assert(NewTemplateDecl && "Template/non-template mismatch"); 3904 if (CXXMethodDecl *Method 3905 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3906 Method->setAccess(OldTemplateDecl->getAccess()); 3907 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3908 } 3909 3910 // If this is an explicit specialization of a member that is a function 3911 // template, mark it as a member specialization. 3912 if (IsExplicitSpecialization && 3913 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3914 NewTemplateDecl->setMemberSpecialization(); 3915 assert(OldTemplateDecl->isMemberSpecialization()); 3916 } 3917 } else { 3918 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3919 NewFD->setAccess(OldDecl->getAccess()); 3920 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3921 } 3922 } 3923 } 3924 3925 // Semantic checking for this function declaration (in isolation). 3926 if (getLangOptions().CPlusPlus) { 3927 // C++-specific checks. 3928 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3929 CheckConstructor(Constructor); 3930 } else if (CXXDestructorDecl *Destructor = 3931 dyn_cast<CXXDestructorDecl>(NewFD)) { 3932 CXXRecordDecl *Record = Destructor->getParent(); 3933 QualType ClassType = Context.getTypeDeclType(Record); 3934 3935 // FIXME: Shouldn't we be able to perform this check even when the class 3936 // type is dependent? Both gcc and edg can handle that. 3937 if (!ClassType->isDependentType()) { 3938 DeclarationName Name 3939 = Context.DeclarationNames.getCXXDestructorName( 3940 Context.getCanonicalType(ClassType)); 3941// NewFD->getDeclName().dump(); 3942// Name.dump(); 3943 if (NewFD->getDeclName() != Name) { 3944 Diag(NewFD->getLocation(), diag::err_destructor_name); 3945 return NewFD->setInvalidDecl(); 3946 } 3947 } 3948 } else if (CXXConversionDecl *Conversion 3949 = dyn_cast<CXXConversionDecl>(NewFD)) { 3950 ActOnConversionDeclarator(Conversion); 3951 } 3952 3953 // Find any virtual functions that this function overrides. 3954 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3955 if (!Method->isFunctionTemplateSpecialization() && 3956 !Method->getDescribedFunctionTemplate()) 3957 AddOverriddenMethods(Method->getParent(), Method); 3958 } 3959 3960 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3961 if (NewFD->isOverloadedOperator() && 3962 CheckOverloadedOperatorDeclaration(NewFD)) 3963 return NewFD->setInvalidDecl(); 3964 3965 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3966 if (NewFD->getLiteralIdentifier() && 3967 CheckLiteralOperatorDeclaration(NewFD)) 3968 return NewFD->setInvalidDecl(); 3969 3970 // In C++, check default arguments now that we have merged decls. Unless 3971 // the lexical context is the class, because in this case this is done 3972 // during delayed parsing anyway. 3973 if (!CurContext->isRecord()) 3974 CheckCXXDefaultArguments(NewFD); 3975 } 3976} 3977 3978void Sema::CheckMain(FunctionDecl* FD) { 3979 // C++ [basic.start.main]p3: A program that declares main to be inline 3980 // or static is ill-formed. 3981 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3982 // shall not appear in a declaration of main. 3983 // static main is not an error under C99, but we should warn about it. 3984 bool isInline = FD->isInlineSpecified(); 3985 bool isStatic = FD->getStorageClass() == SC_Static; 3986 if (isInline || isStatic) { 3987 unsigned diagID = diag::warn_unusual_main_decl; 3988 if (isInline || getLangOptions().CPlusPlus) 3989 diagID = diag::err_unusual_main_decl; 3990 3991 int which = isStatic + (isInline << 1) - 1; 3992 Diag(FD->getLocation(), diagID) << which; 3993 } 3994 3995 QualType T = FD->getType(); 3996 assert(T->isFunctionType() && "function decl is not of function type"); 3997 const FunctionType* FT = T->getAs<FunctionType>(); 3998 3999 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 4000 TypeSourceInfo *TSI = FD->getTypeSourceInfo(); 4001 TypeLoc TL = TSI->getTypeLoc(); 4002 const SemaDiagnosticBuilder& D = Diag(FD->getTypeSpecStartLoc(), 4003 diag::err_main_returns_nonint); 4004 if (FunctionTypeLoc* PTL = dyn_cast<FunctionTypeLoc>(&TL)) { 4005 D << FixItHint::CreateReplacement(PTL->getResultLoc().getSourceRange(), 4006 "int"); 4007 } 4008 FD->setInvalidDecl(true); 4009 } 4010 4011 // Treat protoless main() as nullary. 4012 if (isa<FunctionNoProtoType>(FT)) return; 4013 4014 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 4015 unsigned nparams = FTP->getNumArgs(); 4016 assert(FD->getNumParams() == nparams); 4017 4018 bool HasExtraParameters = (nparams > 3); 4019 4020 // Darwin passes an undocumented fourth argument of type char**. If 4021 // other platforms start sprouting these, the logic below will start 4022 // getting shifty. 4023 if (nparams == 4 && 4024 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 4025 HasExtraParameters = false; 4026 4027 if (HasExtraParameters) { 4028 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 4029 FD->setInvalidDecl(true); 4030 nparams = 3; 4031 } 4032 4033 // FIXME: a lot of the following diagnostics would be improved 4034 // if we had some location information about types. 4035 4036 QualType CharPP = 4037 Context.getPointerType(Context.getPointerType(Context.CharTy)); 4038 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 4039 4040 for (unsigned i = 0; i < nparams; ++i) { 4041 QualType AT = FTP->getArgType(i); 4042 4043 bool mismatch = true; 4044 4045 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 4046 mismatch = false; 4047 else if (Expected[i] == CharPP) { 4048 // As an extension, the following forms are okay: 4049 // char const ** 4050 // char const * const * 4051 // char * const * 4052 4053 QualifierCollector qs; 4054 const PointerType* PT; 4055 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 4056 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 4057 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 4058 qs.removeConst(); 4059 mismatch = !qs.empty(); 4060 } 4061 } 4062 4063 if (mismatch) { 4064 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 4065 // TODO: suggest replacing given type with expected type 4066 FD->setInvalidDecl(true); 4067 } 4068 } 4069 4070 if (nparams == 1 && !FD->isInvalidDecl()) { 4071 Diag(FD->getLocation(), diag::warn_main_one_arg); 4072 } 4073} 4074 4075bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 4076 // FIXME: Need strict checking. In C89, we need to check for 4077 // any assignment, increment, decrement, function-calls, or 4078 // commas outside of a sizeof. In C99, it's the same list, 4079 // except that the aforementioned are allowed in unevaluated 4080 // expressions. Everything else falls under the 4081 // "may accept other forms of constant expressions" exception. 4082 // (We never end up here for C++, so the constant expression 4083 // rules there don't matter.) 4084 if (Init->isConstantInitializer(Context, false)) 4085 return false; 4086 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 4087 << Init->getSourceRange(); 4088 return true; 4089} 4090 4091void Sema::AddInitializerToDecl(Decl *dcl, Expr *init) { 4092 AddInitializerToDecl(dcl, init, /*DirectInit=*/false); 4093} 4094 4095/// AddInitializerToDecl - Adds the initializer Init to the 4096/// declaration dcl. If DirectInit is true, this is C++ direct 4097/// initialization rather than copy initialization. 4098void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, bool DirectInit) { 4099 // If there is no declaration, there was an error parsing it. Just ignore 4100 // the initializer. 4101 if (RealDecl == 0) 4102 return; 4103 4104 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 4105 // With declarators parsed the way they are, the parser cannot 4106 // distinguish between a normal initializer and a pure-specifier. 4107 // Thus this grotesque test. 4108 IntegerLiteral *IL; 4109 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 4110 Context.getCanonicalType(IL->getType()) == Context.IntTy) 4111 CheckPureMethod(Method, Init->getSourceRange()); 4112 else { 4113 Diag(Method->getLocation(), diag::err_member_function_initialization) 4114 << Method->getDeclName() << Init->getSourceRange(); 4115 Method->setInvalidDecl(); 4116 } 4117 return; 4118 } 4119 4120 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4121 if (!VDecl) { 4122 if (getLangOptions().CPlusPlus && 4123 RealDecl->getLexicalDeclContext()->isRecord() && 4124 isa<NamedDecl>(RealDecl)) 4125 Diag(RealDecl->getLocation(), diag::err_member_initialization); 4126 else 4127 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4128 RealDecl->setInvalidDecl(); 4129 return; 4130 } 4131 4132 4133 4134 // A definition must end up with a complete type, which means it must be 4135 // complete with the restriction that an array type might be completed by the 4136 // initializer; note that later code assumes this restriction. 4137 QualType BaseDeclType = VDecl->getType(); 4138 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 4139 BaseDeclType = Array->getElementType(); 4140 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 4141 diag::err_typecheck_decl_incomplete_type)) { 4142 RealDecl->setInvalidDecl(); 4143 return; 4144 } 4145 4146 // The variable can not have an abstract class type. 4147 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4148 diag::err_abstract_type_in_decl, 4149 AbstractVariableType)) 4150 VDecl->setInvalidDecl(); 4151 4152 const VarDecl *Def; 4153 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4154 Diag(VDecl->getLocation(), diag::err_redefinition) 4155 << VDecl->getDeclName(); 4156 Diag(Def->getLocation(), diag::note_previous_definition); 4157 VDecl->setInvalidDecl(); 4158 return; 4159 } 4160 4161 // C++ [class.static.data]p4 4162 // If a static data member is of const integral or const 4163 // enumeration type, its declaration in the class definition can 4164 // specify a constant-initializer which shall be an integral 4165 // constant expression (5.19). In that case, the member can appear 4166 // in integral constant expressions. The member shall still be 4167 // defined in a namespace scope if it is used in the program and the 4168 // namespace scope definition shall not contain an initializer. 4169 // 4170 // We already performed a redefinition check above, but for static 4171 // data members we also need to check whether there was an in-class 4172 // declaration with an initializer. 4173 const VarDecl* PrevInit = 0; 4174 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 4175 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 4176 Diag(PrevInit->getLocation(), diag::note_previous_definition); 4177 return; 4178 } 4179 4180 if (getLangOptions().CPlusPlus && VDecl->hasLocalStorage()) 4181 getCurFunction()->setHasBranchProtectedScope(); 4182 4183 // Capture the variable that is being initialized and the style of 4184 // initialization. 4185 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4186 4187 // FIXME: Poor source location information. 4188 InitializationKind Kind 4189 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 4190 Init->getLocStart(), 4191 Init->getLocEnd()) 4192 : InitializationKind::CreateCopy(VDecl->getLocation(), 4193 Init->getLocStart()); 4194 4195 // Get the decls type and save a reference for later, since 4196 // CheckInitializerTypes may change it. 4197 QualType DclT = VDecl->getType(), SavT = DclT; 4198 if (VDecl->isBlockVarDecl()) { 4199 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 4200 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 4201 VDecl->setInvalidDecl(); 4202 } else if (!VDecl->isInvalidDecl()) { 4203 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4204 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4205 MultiExprArg(*this, &Init, 1), 4206 &DclT); 4207 if (Result.isInvalid()) { 4208 VDecl->setInvalidDecl(); 4209 return; 4210 } 4211 4212 Init = Result.takeAs<Expr>(); 4213 4214 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4215 // Don't check invalid declarations to avoid emitting useless diagnostics. 4216 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4217 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 4218 CheckForConstantInitializer(Init, DclT); 4219 } 4220 } 4221 } else if (VDecl->isStaticDataMember() && 4222 VDecl->getLexicalDeclContext()->isRecord()) { 4223 // This is an in-class initialization for a static data member, e.g., 4224 // 4225 // struct S { 4226 // static const int value = 17; 4227 // }; 4228 4229 // Try to perform the initialization regardless. 4230 if (!VDecl->isInvalidDecl()) { 4231 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4232 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4233 MultiExprArg(*this, &Init, 1), 4234 &DclT); 4235 if (Result.isInvalid()) { 4236 VDecl->setInvalidDecl(); 4237 return; 4238 } 4239 4240 Init = Result.takeAs<Expr>(); 4241 } 4242 4243 // C++ [class.mem]p4: 4244 // A member-declarator can contain a constant-initializer only 4245 // if it declares a static member (9.4) of const integral or 4246 // const enumeration type, see 9.4.2. 4247 QualType T = VDecl->getType(); 4248 4249 // Do nothing on dependent types. 4250 if (T->isDependentType()) { 4251 4252 // Require constness. 4253 } else if (!T.isConstQualified()) { 4254 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 4255 << Init->getSourceRange(); 4256 VDecl->setInvalidDecl(); 4257 4258 // We allow integer constant expressions in all cases. 4259 } else if (T->isIntegralOrEnumerationType()) { 4260 if (!Init->isValueDependent()) { 4261 // Check whether the expression is a constant expression. 4262 llvm::APSInt Value; 4263 SourceLocation Loc; 4264 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 4265 Diag(Loc, diag::err_in_class_initializer_non_constant) 4266 << Init->getSourceRange(); 4267 VDecl->setInvalidDecl(); 4268 } 4269 } 4270 4271 // We allow floating-point constants as an extension in C++03, and 4272 // C++0x has far more complicated rules that we don't really 4273 // implement fully. 4274 } else { 4275 bool Allowed = false; 4276 if (getLangOptions().CPlusPlus0x) { 4277 Allowed = T->isLiteralType(); 4278 } else if (T->isFloatingType()) { // also permits complex, which is ok 4279 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 4280 << T << Init->getSourceRange(); 4281 Allowed = true; 4282 } 4283 4284 if (!Allowed) { 4285 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 4286 << T << Init->getSourceRange(); 4287 VDecl->setInvalidDecl(); 4288 4289 // TODO: there are probably expressions that pass here that shouldn't. 4290 } else if (!Init->isValueDependent() && 4291 !Init->isConstantInitializer(Context, false)) { 4292 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 4293 << Init->getSourceRange(); 4294 VDecl->setInvalidDecl(); 4295 } 4296 } 4297 } else if (VDecl->isFileVarDecl()) { 4298 if (VDecl->getStorageClass() == SC_Extern && 4299 (!getLangOptions().CPlusPlus || 4300 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 4301 Diag(VDecl->getLocation(), diag::warn_extern_init); 4302 if (!VDecl->isInvalidDecl()) { 4303 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4304 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4305 MultiExprArg(*this, &Init, 1), 4306 &DclT); 4307 if (Result.isInvalid()) { 4308 VDecl->setInvalidDecl(); 4309 return; 4310 } 4311 4312 Init = Result.takeAs<Expr>(); 4313 } 4314 4315 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4316 // Don't check invalid declarations to avoid emitting useless diagnostics. 4317 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4318 // C99 6.7.8p4. All file scoped initializers need to be constant. 4319 CheckForConstantInitializer(Init, DclT); 4320 } 4321 } 4322 // If the type changed, it means we had an incomplete type that was 4323 // completed by the initializer. For example: 4324 // int ary[] = { 1, 3, 5 }; 4325 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 4326 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 4327 VDecl->setType(DclT); 4328 Init->setType(DclT); 4329 } 4330 4331 Init = MaybeCreateCXXExprWithTemporaries(Init); 4332 // Attach the initializer to the decl. 4333 VDecl->setInit(Init); 4334 4335 if (getLangOptions().CPlusPlus) { 4336 if (!VDecl->isInvalidDecl() && 4337 !VDecl->getDeclContext()->isDependentContext() && 4338 VDecl->hasGlobalStorage() && !VDecl->isStaticLocal() && 4339 !Init->isConstantInitializer(Context, 4340 VDecl->getType()->isReferenceType())) 4341 Diag(VDecl->getLocation(), diag::warn_global_constructor) 4342 << Init->getSourceRange(); 4343 4344 // Make sure we mark the destructor as used if necessary. 4345 QualType InitType = VDecl->getType(); 4346 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 4347 InitType = Context.getBaseElementType(Array); 4348 if (const RecordType *Record = InitType->getAs<RecordType>()) 4349 FinalizeVarWithDestructor(VDecl, Record); 4350 } 4351 4352 return; 4353} 4354 4355/// ActOnInitializerError - Given that there was an error parsing an 4356/// initializer for the given declaration, try to return to some form 4357/// of sanity. 4358void Sema::ActOnInitializerError(Decl *D) { 4359 // Our main concern here is re-establishing invariants like "a 4360 // variable's type is either dependent or complete". 4361 if (!D || D->isInvalidDecl()) return; 4362 4363 VarDecl *VD = dyn_cast<VarDecl>(D); 4364 if (!VD) return; 4365 4366 QualType Ty = VD->getType(); 4367 if (Ty->isDependentType()) return; 4368 4369 // Require a complete type. 4370 if (RequireCompleteType(VD->getLocation(), 4371 Context.getBaseElementType(Ty), 4372 diag::err_typecheck_decl_incomplete_type)) { 4373 VD->setInvalidDecl(); 4374 return; 4375 } 4376 4377 // Require an abstract type. 4378 if (RequireNonAbstractType(VD->getLocation(), Ty, 4379 diag::err_abstract_type_in_decl, 4380 AbstractVariableType)) { 4381 VD->setInvalidDecl(); 4382 return; 4383 } 4384 4385 // Don't bother complaining about constructors or destructors, 4386 // though. 4387} 4388 4389void Sema::ActOnUninitializedDecl(Decl *RealDecl, 4390 bool TypeContainsUndeducedAuto) { 4391 // If there is no declaration, there was an error parsing it. Just ignore it. 4392 if (RealDecl == 0) 4393 return; 4394 4395 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 4396 QualType Type = Var->getType(); 4397 4398 // C++0x [dcl.spec.auto]p3 4399 if (TypeContainsUndeducedAuto) { 4400 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 4401 << Var->getDeclName() << Type; 4402 Var->setInvalidDecl(); 4403 return; 4404 } 4405 4406 switch (Var->isThisDeclarationADefinition()) { 4407 case VarDecl::Definition: 4408 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 4409 break; 4410 4411 // We have an out-of-line definition of a static data member 4412 // that has an in-class initializer, so we type-check this like 4413 // a declaration. 4414 // 4415 // Fall through 4416 4417 case VarDecl::DeclarationOnly: 4418 // It's only a declaration. 4419 4420 // Block scope. C99 6.7p7: If an identifier for an object is 4421 // declared with no linkage (C99 6.2.2p6), the type for the 4422 // object shall be complete. 4423 if (!Type->isDependentType() && Var->isBlockVarDecl() && 4424 !Var->getLinkage() && !Var->isInvalidDecl() && 4425 RequireCompleteType(Var->getLocation(), Type, 4426 diag::err_typecheck_decl_incomplete_type)) 4427 Var->setInvalidDecl(); 4428 4429 // Make sure that the type is not abstract. 4430 if (!Type->isDependentType() && !Var->isInvalidDecl() && 4431 RequireNonAbstractType(Var->getLocation(), Type, 4432 diag::err_abstract_type_in_decl, 4433 AbstractVariableType)) 4434 Var->setInvalidDecl(); 4435 return; 4436 4437 case VarDecl::TentativeDefinition: 4438 // File scope. C99 6.9.2p2: A declaration of an identifier for an 4439 // object that has file scope without an initializer, and without a 4440 // storage-class specifier or with the storage-class specifier "static", 4441 // constitutes a tentative definition. Note: A tentative definition with 4442 // external linkage is valid (C99 6.2.2p5). 4443 if (!Var->isInvalidDecl()) { 4444 if (const IncompleteArrayType *ArrayT 4445 = Context.getAsIncompleteArrayType(Type)) { 4446 if (RequireCompleteType(Var->getLocation(), 4447 ArrayT->getElementType(), 4448 diag::err_illegal_decl_array_incomplete_type)) 4449 Var->setInvalidDecl(); 4450 } else if (Var->getStorageClass() == SC_Static) { 4451 // C99 6.9.2p3: If the declaration of an identifier for an object is 4452 // a tentative definition and has internal linkage (C99 6.2.2p3), the 4453 // declared type shall not be an incomplete type. 4454 // NOTE: code such as the following 4455 // static struct s; 4456 // struct s { int a; }; 4457 // is accepted by gcc. Hence here we issue a warning instead of 4458 // an error and we do not invalidate the static declaration. 4459 // NOTE: to avoid multiple warnings, only check the first declaration. 4460 if (Var->getPreviousDeclaration() == 0) 4461 RequireCompleteType(Var->getLocation(), Type, 4462 diag::ext_typecheck_decl_incomplete_type); 4463 } 4464 } 4465 4466 // Record the tentative definition; we're done. 4467 if (!Var->isInvalidDecl()) 4468 TentativeDefinitions.push_back(Var); 4469 return; 4470 } 4471 4472 // Provide a specific diagnostic for uninitialized variable 4473 // definitions with incomplete array type. 4474 if (Type->isIncompleteArrayType()) { 4475 Diag(Var->getLocation(), 4476 diag::err_typecheck_incomplete_array_needs_initializer); 4477 Var->setInvalidDecl(); 4478 return; 4479 } 4480 4481 // Provide a specific diagnostic for uninitialized variable 4482 // definitions with reference type. 4483 if (Type->isReferenceType()) { 4484 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 4485 << Var->getDeclName() 4486 << SourceRange(Var->getLocation(), Var->getLocation()); 4487 Var->setInvalidDecl(); 4488 return; 4489 } 4490 4491 // Do not attempt to type-check the default initializer for a 4492 // variable with dependent type. 4493 if (Type->isDependentType()) 4494 return; 4495 4496 if (Var->isInvalidDecl()) 4497 return; 4498 4499 if (RequireCompleteType(Var->getLocation(), 4500 Context.getBaseElementType(Type), 4501 diag::err_typecheck_decl_incomplete_type)) { 4502 Var->setInvalidDecl(); 4503 return; 4504 } 4505 4506 // The variable can not have an abstract class type. 4507 if (RequireNonAbstractType(Var->getLocation(), Type, 4508 diag::err_abstract_type_in_decl, 4509 AbstractVariableType)) { 4510 Var->setInvalidDecl(); 4511 return; 4512 } 4513 4514 const RecordType *Record 4515 = Context.getBaseElementType(Type)->getAs<RecordType>(); 4516 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 4517 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 4518 // C++03 [dcl.init]p9: 4519 // If no initializer is specified for an object, and the 4520 // object is of (possibly cv-qualified) non-POD class type (or 4521 // array thereof), the object shall be default-initialized; if 4522 // the object is of const-qualified type, the underlying class 4523 // type shall have a user-declared default 4524 // constructor. Otherwise, if no initializer is specified for 4525 // a non- static object, the object and its subobjects, if 4526 // any, have an indeterminate initial value); if the object 4527 // or any of its subobjects are of const-qualified type, the 4528 // program is ill-formed. 4529 // FIXME: DPG thinks it is very fishy that C++0x disables this. 4530 } else { 4531 // Check for jumps past the implicit initializer. C++0x 4532 // clarifies that this applies to a "variable with automatic 4533 // storage duration", not a "local variable". 4534 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) 4535 getCurFunction()->setHasBranchProtectedScope(); 4536 4537 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 4538 InitializationKind Kind 4539 = InitializationKind::CreateDefault(Var->getLocation()); 4540 4541 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 4542 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 4543 MultiExprArg(*this, 0, 0)); 4544 if (Init.isInvalid()) 4545 Var->setInvalidDecl(); 4546 else if (Init.get()) { 4547 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 4548 4549 if (getLangOptions().CPlusPlus && !Var->isInvalidDecl() && 4550 Var->hasGlobalStorage() && !Var->isStaticLocal() && 4551 !Var->getDeclContext()->isDependentContext() && 4552 !Var->getInit()->isConstantInitializer(Context, false)) 4553 Diag(Var->getLocation(), diag::warn_global_constructor); 4554 } 4555 } 4556 4557 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record) 4558 FinalizeVarWithDestructor(Var, Record); 4559 } 4560} 4561 4562Sema::DeclGroupPtrTy 4563Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 4564 Decl **Group, unsigned NumDecls) { 4565 llvm::SmallVector<Decl*, 8> Decls; 4566 4567 if (DS.isTypeSpecOwned()) 4568 Decls.push_back(DS.getRepAsDecl()); 4569 4570 for (unsigned i = 0; i != NumDecls; ++i) 4571 if (Decl *D = Group[i]) 4572 Decls.push_back(D); 4573 4574 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 4575 Decls.data(), Decls.size())); 4576} 4577 4578 4579/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 4580/// to introduce parameters into function prototype scope. 4581Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 4582 const DeclSpec &DS = D.getDeclSpec(); 4583 4584 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 4585 VarDecl::StorageClass StorageClass = SC_None; 4586 VarDecl::StorageClass StorageClassAsWritten = SC_None; 4587 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 4588 StorageClass = SC_Register; 4589 StorageClassAsWritten = SC_Register; 4590 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 4591 Diag(DS.getStorageClassSpecLoc(), 4592 diag::err_invalid_storage_class_in_func_decl); 4593 D.getMutableDeclSpec().ClearStorageClassSpecs(); 4594 } 4595 4596 if (D.getDeclSpec().isThreadSpecified()) 4597 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4598 4599 DiagnoseFunctionSpecifiers(D); 4600 4601 // Check that there are no default arguments inside the type of this 4602 // parameter (C++ only). 4603 if (getLangOptions().CPlusPlus) 4604 CheckExtraCXXDefaultArguments(D); 4605 4606 TagDecl *OwnedDecl = 0; 4607 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 4608 QualType parmDeclType = TInfo->getType(); 4609 4610 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 4611 // C++ [dcl.fct]p6: 4612 // Types shall not be defined in return or parameter types. 4613 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 4614 << Context.getTypeDeclType(OwnedDecl); 4615 } 4616 4617 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 4618 IdentifierInfo *II = D.getIdentifier(); 4619 if (II) { 4620 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 4621 ForRedeclaration); 4622 LookupName(R, S); 4623 if (R.isSingleResult()) { 4624 NamedDecl *PrevDecl = R.getFoundDecl(); 4625 if (PrevDecl->isTemplateParameter()) { 4626 // Maybe we will complain about the shadowed template parameter. 4627 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4628 // Just pretend that we didn't see the previous declaration. 4629 PrevDecl = 0; 4630 } else if (S->isDeclScope(PrevDecl)) { 4631 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 4632 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4633 4634 // Recover by removing the name 4635 II = 0; 4636 D.SetIdentifier(0, D.getIdentifierLoc()); 4637 D.setInvalidType(true); 4638 } 4639 } 4640 } 4641 4642 // Temporarily put parameter variables in the translation unit, not 4643 // the enclosing context. This prevents them from accidentally 4644 // looking like class members in C++. 4645 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 4646 TInfo, parmDeclType, II, 4647 D.getIdentifierLoc(), 4648 StorageClass, StorageClassAsWritten); 4649 4650 if (D.isInvalidType()) 4651 New->setInvalidDecl(); 4652 4653 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 4654 if (D.getCXXScopeSpec().isSet()) { 4655 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 4656 << D.getCXXScopeSpec().getRange(); 4657 New->setInvalidDecl(); 4658 } 4659 4660 // Add the parameter declaration into this scope. 4661 S->AddDecl(New); 4662 if (II) 4663 IdResolver.AddDecl(New); 4664 4665 ProcessDeclAttributes(S, New, D); 4666 4667 if (New->hasAttr<BlocksAttr>()) { 4668 Diag(New->getLocation(), diag::err_block_on_nonlocal); 4669 } 4670 return New; 4671} 4672 4673/// \brief Synthesizes a variable for a parameter arising from a 4674/// typedef. 4675ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 4676 SourceLocation Loc, 4677 QualType T) { 4678 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, 0, 4679 T, Context.getTrivialTypeSourceInfo(T, Loc), 4680 SC_None, SC_None, 0); 4681 Param->setImplicit(); 4682 return Param; 4683} 4684 4685void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 4686 ParmVarDecl * const *ParamEnd) { 4687 if (Diags.getDiagnosticLevel(diag::warn_unused_parameter) == 4688 Diagnostic::Ignored) 4689 return; 4690 4691 // Don't diagnose unused-parameter errors in template instantiations; we 4692 // will already have done so in the template itself. 4693 if (!ActiveTemplateInstantiations.empty()) 4694 return; 4695 4696 for (; Param != ParamEnd; ++Param) { 4697 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 4698 !(*Param)->hasAttr<UnusedAttr>()) { 4699 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 4700 << (*Param)->getDeclName(); 4701 } 4702 } 4703} 4704 4705ParmVarDecl *Sema::CheckParameter(DeclContext *DC, 4706 TypeSourceInfo *TSInfo, QualType T, 4707 IdentifierInfo *Name, 4708 SourceLocation NameLoc, 4709 VarDecl::StorageClass StorageClass, 4710 VarDecl::StorageClass StorageClassAsWritten) { 4711 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, NameLoc, Name, 4712 adjustParameterType(T), TSInfo, 4713 StorageClass, StorageClassAsWritten, 4714 0); 4715 4716 // Parameters can not be abstract class types. 4717 // For record types, this is done by the AbstractClassUsageDiagnoser once 4718 // the class has been completely parsed. 4719 if (!CurContext->isRecord() && 4720 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 4721 AbstractParamType)) 4722 New->setInvalidDecl(); 4723 4724 // Parameter declarators cannot be interface types. All ObjC objects are 4725 // passed by reference. 4726 if (T->isObjCObjectType()) { 4727 Diag(NameLoc, 4728 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 4729 New->setInvalidDecl(); 4730 } 4731 4732 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 4733 // duration shall not be qualified by an address-space qualifier." 4734 // Since all parameters have automatic store duration, they can not have 4735 // an address space. 4736 if (T.getAddressSpace() != 0) { 4737 Diag(NameLoc, diag::err_arg_with_address_space); 4738 New->setInvalidDecl(); 4739 } 4740 4741 return New; 4742} 4743 4744void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 4745 SourceLocation LocAfterDecls) { 4746 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4747 "Not a function declarator!"); 4748 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4749 4750 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 4751 // for a K&R function. 4752 if (!FTI.hasPrototype) { 4753 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 4754 --i; 4755 if (FTI.ArgInfo[i].Param == 0) { 4756 llvm::SmallString<256> Code; 4757 llvm::raw_svector_ostream(Code) << " int " 4758 << FTI.ArgInfo[i].Ident->getName() 4759 << ";\n"; 4760 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 4761 << FTI.ArgInfo[i].Ident 4762 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 4763 4764 // Implicitly declare the argument as type 'int' for lack of a better 4765 // type. 4766 DeclSpec DS; 4767 const char* PrevSpec; // unused 4768 unsigned DiagID; // unused 4769 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 4770 PrevSpec, DiagID); 4771 Declarator ParamD(DS, Declarator::KNRTypeListContext); 4772 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 4773 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 4774 } 4775 } 4776 } 4777} 4778 4779Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 4780 Declarator &D) { 4781 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 4782 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4783 "Not a function declarator!"); 4784 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4785 4786 if (FTI.hasPrototype) { 4787 // FIXME: Diagnose arguments without names in C. 4788 } 4789 4790 Scope *ParentScope = FnBodyScope->getParent(); 4791 4792 Decl *DP = HandleDeclarator(ParentScope, D, 4793 MultiTemplateParamsArg(*this), 4794 /*IsFunctionDefinition=*/true); 4795 return ActOnStartOfFunctionDef(FnBodyScope, DP); 4796} 4797 4798static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 4799 // Don't warn about invalid declarations. 4800 if (FD->isInvalidDecl()) 4801 return false; 4802 4803 // Or declarations that aren't global. 4804 if (!FD->isGlobal()) 4805 return false; 4806 4807 // Don't warn about C++ member functions. 4808 if (isa<CXXMethodDecl>(FD)) 4809 return false; 4810 4811 // Don't warn about 'main'. 4812 if (FD->isMain()) 4813 return false; 4814 4815 // Don't warn about inline functions. 4816 if (FD->isInlineSpecified()) 4817 return false; 4818 4819 // Don't warn about function templates. 4820 if (FD->getDescribedFunctionTemplate()) 4821 return false; 4822 4823 // Don't warn about function template specializations. 4824 if (FD->isFunctionTemplateSpecialization()) 4825 return false; 4826 4827 bool MissingPrototype = true; 4828 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4829 Prev; Prev = Prev->getPreviousDeclaration()) { 4830 // Ignore any declarations that occur in function or method 4831 // scope, because they aren't visible from the header. 4832 if (Prev->getDeclContext()->isFunctionOrMethod()) 4833 continue; 4834 4835 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4836 break; 4837 } 4838 4839 return MissingPrototype; 4840} 4841 4842Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 4843 // Clear the last template instantiation error context. 4844 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4845 4846 if (!D) 4847 return D; 4848 FunctionDecl *FD = 0; 4849 4850 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 4851 FD = FunTmpl->getTemplatedDecl(); 4852 else 4853 FD = cast<FunctionDecl>(D); 4854 4855 // Enter a new function scope 4856 PushFunctionScope(); 4857 4858 // See if this is a redefinition. 4859 // But don't complain if we're in GNU89 mode and the previous definition 4860 // was an extern inline function. 4861 const FunctionDecl *Definition; 4862 if (FD->hasBody(Definition) && 4863 !canRedefineFunction(Definition, getLangOptions())) { 4864 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 4865 Definition->getStorageClass() == SC_Extern) 4866 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 4867 << FD->getDeclName() << getLangOptions().CPlusPlus; 4868 else 4869 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4870 Diag(Definition->getLocation(), diag::note_previous_definition); 4871 } 4872 4873 // Builtin functions cannot be defined. 4874 if (unsigned BuiltinID = FD->getBuiltinID()) { 4875 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4876 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4877 FD->setInvalidDecl(); 4878 } 4879 } 4880 4881 // The return type of a function definition must be complete 4882 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4883 QualType ResultType = FD->getResultType(); 4884 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4885 !FD->isInvalidDecl() && 4886 RequireCompleteType(FD->getLocation(), ResultType, 4887 diag::err_func_def_incomplete_result)) 4888 FD->setInvalidDecl(); 4889 4890 // GNU warning -Wmissing-prototypes: 4891 // Warn if a global function is defined without a previous 4892 // prototype declaration. This warning is issued even if the 4893 // definition itself provides a prototype. The aim is to detect 4894 // global functions that fail to be declared in header files. 4895 if (ShouldWarnAboutMissingPrototype(FD)) 4896 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4897 4898 if (FnBodyScope) 4899 PushDeclContext(FnBodyScope, FD); 4900 4901 // Check the validity of our function parameters 4902 CheckParmsForFunctionDef(FD); 4903 4904 bool ShouldCheckShadow = 4905 Diags.getDiagnosticLevel(diag::warn_decl_shadow) != Diagnostic::Ignored; 4906 4907 // Introduce our parameters into the function scope 4908 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4909 ParmVarDecl *Param = FD->getParamDecl(p); 4910 Param->setOwningFunction(FD); 4911 4912 // If this has an identifier, add it to the scope stack. 4913 if (Param->getIdentifier() && FnBodyScope) { 4914 if (ShouldCheckShadow) 4915 CheckShadow(FnBodyScope, Param); 4916 4917 PushOnScopeChains(Param, FnBodyScope); 4918 } 4919 } 4920 4921 // Checking attributes of current function definition 4922 // dllimport attribute. 4923 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 4924 if (DA && (!FD->getAttr<DLLExportAttr>())) { 4925 // dllimport attribute cannot be directly applied to definition. 4926 if (!DA->isInherited()) { 4927 Diag(FD->getLocation(), 4928 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4929 << "dllimport"; 4930 FD->setInvalidDecl(); 4931 return FD; 4932 } 4933 4934 // Visual C++ appears to not think this is an issue, so only issue 4935 // a warning when Microsoft extensions are disabled. 4936 if (!LangOpts.Microsoft) { 4937 // If a symbol previously declared dllimport is later defined, the 4938 // attribute is ignored in subsequent references, and a warning is 4939 // emitted. 4940 Diag(FD->getLocation(), 4941 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4942 << FD->getName() << "dllimport"; 4943 } 4944 } 4945 return FD; 4946} 4947 4948/// \brief Given the set of return statements within a function body, 4949/// compute the variables that are subject to the named return value 4950/// optimization. 4951/// 4952/// Each of the variables that is subject to the named return value 4953/// optimization will be marked as NRVO variables in the AST, and any 4954/// return statement that has a marked NRVO variable as its NRVO candidate can 4955/// use the named return value optimization. 4956/// 4957/// This function applies a very simplistic algorithm for NRVO: if every return 4958/// statement in the function has the same NRVO candidate, that candidate is 4959/// the NRVO variable. 4960/// 4961/// FIXME: Employ a smarter algorithm that accounts for multiple return 4962/// statements and the lifetimes of the NRVO candidates. We should be able to 4963/// find a maximal set of NRVO variables. 4964static void ComputeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 4965 ReturnStmt **Returns = Scope->Returns.data(); 4966 4967 const VarDecl *NRVOCandidate = 0; 4968 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 4969 if (!Returns[I]->getNRVOCandidate()) 4970 return; 4971 4972 if (!NRVOCandidate) 4973 NRVOCandidate = Returns[I]->getNRVOCandidate(); 4974 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 4975 return; 4976 } 4977 4978 if (NRVOCandidate) 4979 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 4980} 4981 4982Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 4983 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4984} 4985 4986Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 4987 bool IsInstantiation) { 4988 FunctionDecl *FD = 0; 4989 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4990 if (FunTmpl) 4991 FD = FunTmpl->getTemplatedDecl(); 4992 else 4993 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4994 4995 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 4996 4997 if (FD) { 4998 FD->setBody(Body); 4999 if (FD->isMain()) { 5000 // C and C++ allow for main to automagically return 0. 5001 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 5002 FD->setHasImplicitReturnZero(true); 5003 WP.disableCheckFallThrough(); 5004 } 5005 5006 if (!FD->isInvalidDecl()) { 5007 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 5008 5009 // If this is a constructor, we need a vtable. 5010 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 5011 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 5012 5013 ComputeNRVO(Body, getCurFunction()); 5014 } 5015 5016 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 5017 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 5018 assert(MD == getCurMethodDecl() && "Method parsing confused"); 5019 MD->setBody(Body); 5020 MD->setEndLoc(Body->getLocEnd()); 5021 if (!MD->isInvalidDecl()) 5022 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 5023 } else { 5024 return 0; 5025 } 5026 5027 // Verify and clean out per-function state. 5028 5029 // Check goto/label use. 5030 FunctionScopeInfo *CurFn = getCurFunction(); 5031 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 5032 I = CurFn->LabelMap.begin(), E = CurFn->LabelMap.end(); I != E; ++I) { 5033 LabelStmt *L = I->second; 5034 5035 // Verify that we have no forward references left. If so, there was a goto 5036 // or address of a label taken, but no definition of it. Label fwd 5037 // definitions are indicated with a null substmt. 5038 if (L->getSubStmt() != 0) { 5039 if (!L->isUsed()) 5040 Diag(L->getIdentLoc(), diag::warn_unused_label) << L->getName(); 5041 continue; 5042 } 5043 5044 // Emit error. 5045 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 5046 5047 // At this point, we have gotos that use the bogus label. Stitch it into 5048 // the function body so that they aren't leaked and that the AST is well 5049 // formed. 5050 if (Body == 0) { 5051 // The whole function wasn't parsed correctly. 5052 continue; 5053 } 5054 5055 // Otherwise, the body is valid: we want to stitch the label decl into the 5056 // function somewhere so that it is properly owned and so that the goto 5057 // has a valid target. Do this by creating a new compound stmt with the 5058 // label in it. 5059 5060 // Give the label a sub-statement. 5061 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 5062 5063 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 5064 cast<CXXTryStmt>(Body)->getTryBlock() : 5065 cast<CompoundStmt>(Body); 5066 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(), 5067 Compound->body_end()); 5068 Elements.push_back(L); 5069 Compound->setStmts(Context, Elements.data(), Elements.size()); 5070 } 5071 5072 if (Body) { 5073 // C++ constructors that have function-try-blocks can't have return 5074 // statements in the handlers of that block. (C++ [except.handle]p14) 5075 // Verify this. 5076 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 5077 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 5078 5079 // Verify that that gotos and switch cases don't jump into scopes illegally. 5080 // Verify that that gotos and switch cases don't jump into scopes illegally. 5081 if (getCurFunction()->NeedsScopeChecking() && 5082 !dcl->isInvalidDecl() && 5083 !hasAnyErrorsInThisFunction()) 5084 DiagnoseInvalidJumps(Body); 5085 5086 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 5087 if (!Destructor->getParent()->isDependentType()) 5088 CheckDestructor(Destructor); 5089 5090 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 5091 Destructor->getParent()); 5092 } 5093 5094 // If any errors have occurred, clear out any temporaries that may have 5095 // been leftover. This ensures that these temporaries won't be picked up for 5096 // deletion in some later function. 5097 if (PP.getDiagnostics().hasErrorOccurred()) 5098 ExprTemporaries.clear(); 5099 else if (!isa<FunctionTemplateDecl>(dcl)) { 5100 // Since the body is valid, issue any analysis-based warnings that are 5101 // enabled. 5102 QualType ResultType; 5103 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 5104 AnalysisWarnings.IssueWarnings(WP, FD); 5105 } else { 5106 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl); 5107 AnalysisWarnings.IssueWarnings(WP, MD); 5108 } 5109 } 5110 5111 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 5112 } 5113 5114 if (!IsInstantiation) 5115 PopDeclContext(); 5116 5117 PopFunctionOrBlockScope(); 5118 5119 // If any errors have occurred, clear out any temporaries that may have 5120 // been leftover. This ensures that these temporaries won't be picked up for 5121 // deletion in some later function. 5122 if (getDiagnostics().hasErrorOccurred()) 5123 ExprTemporaries.clear(); 5124 5125 return dcl; 5126} 5127 5128/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 5129/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 5130NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 5131 IdentifierInfo &II, Scope *S) { 5132 // Before we produce a declaration for an implicitly defined 5133 // function, see whether there was a locally-scoped declaration of 5134 // this name as a function or variable. If so, use that 5135 // (non-visible) declaration, and complain about it. 5136 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5137 = LocallyScopedExternalDecls.find(&II); 5138 if (Pos != LocallyScopedExternalDecls.end()) { 5139 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 5140 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 5141 return Pos->second; 5142 } 5143 5144 // Extension in C99. Legal in C90, but warn about it. 5145 if (II.getName().startswith("__builtin_")) 5146 Diag(Loc, diag::warn_builtin_unknown) << &II; 5147 else if (getLangOptions().C99) 5148 Diag(Loc, diag::ext_implicit_function_decl) << &II; 5149 else 5150 Diag(Loc, diag::warn_implicit_function_decl) << &II; 5151 5152 // Set a Declarator for the implicit definition: int foo(); 5153 const char *Dummy; 5154 DeclSpec DS; 5155 unsigned DiagID; 5156 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 5157 Error = Error; // Silence warning. 5158 assert(!Error && "Error setting up implicit decl!"); 5159 Declarator D(DS, Declarator::BlockContext); 5160 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 5161 0, 0, false, SourceLocation(), 5162 false, 0,0,0, Loc, Loc, D), 5163 SourceLocation()); 5164 D.SetIdentifier(&II, Loc); 5165 5166 // Insert this function into translation-unit scope. 5167 5168 DeclContext *PrevDC = CurContext; 5169 CurContext = Context.getTranslationUnitDecl(); 5170 5171 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 5172 FD->setImplicit(); 5173 5174 CurContext = PrevDC; 5175 5176 AddKnownFunctionAttributes(FD); 5177 5178 return FD; 5179} 5180 5181/// \brief Adds any function attributes that we know a priori based on 5182/// the declaration of this function. 5183/// 5184/// These attributes can apply both to implicitly-declared builtins 5185/// (like __builtin___printf_chk) or to library-declared functions 5186/// like NSLog or printf. 5187void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 5188 if (FD->isInvalidDecl()) 5189 return; 5190 5191 // If this is a built-in function, map its builtin attributes to 5192 // actual attributes. 5193 if (unsigned BuiltinID = FD->getBuiltinID()) { 5194 // Handle printf-formatting attributes. 5195 unsigned FormatIdx; 5196 bool HasVAListArg; 5197 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 5198 if (!FD->getAttr<FormatAttr>()) 5199 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5200 "printf", FormatIdx+1, 5201 HasVAListArg ? 0 : FormatIdx+2)); 5202 } 5203 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 5204 HasVAListArg)) { 5205 if (!FD->getAttr<FormatAttr>()) 5206 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5207 "scanf", FormatIdx+1, 5208 HasVAListArg ? 0 : FormatIdx+2)); 5209 } 5210 5211 // Mark const if we don't care about errno and that is the only 5212 // thing preventing the function from being const. This allows 5213 // IRgen to use LLVM intrinsics for such functions. 5214 if (!getLangOptions().MathErrno && 5215 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 5216 if (!FD->getAttr<ConstAttr>()) 5217 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5218 } 5219 5220 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 5221 FD->setType(Context.getNoReturnType(FD->getType())); 5222 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 5223 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 5224 if (Context.BuiltinInfo.isConst(BuiltinID)) 5225 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5226 } 5227 5228 IdentifierInfo *Name = FD->getIdentifier(); 5229 if (!Name) 5230 return; 5231 if ((!getLangOptions().CPlusPlus && 5232 FD->getDeclContext()->isTranslationUnit()) || 5233 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 5234 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 5235 LinkageSpecDecl::lang_c)) { 5236 // Okay: this could be a libc/libm/Objective-C function we know 5237 // about. 5238 } else 5239 return; 5240 5241 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 5242 // FIXME: NSLog and NSLogv should be target specific 5243 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 5244 // FIXME: We known better than our headers. 5245 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 5246 } else 5247 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5248 "printf", 1, 5249 Name->isStr("NSLogv") ? 0 : 2)); 5250 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 5251 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 5252 // target-specific builtins, perhaps? 5253 if (!FD->getAttr<FormatAttr>()) 5254 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5255 "printf", 2, 5256 Name->isStr("vasprintf") ? 0 : 3)); 5257 } 5258} 5259 5260TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 5261 TypeSourceInfo *TInfo) { 5262 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 5263 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 5264 5265 if (!TInfo) { 5266 assert(D.isInvalidType() && "no declarator info for valid type"); 5267 TInfo = Context.getTrivialTypeSourceInfo(T); 5268 } 5269 5270 // Scope manipulation handled by caller. 5271 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 5272 D.getIdentifierLoc(), 5273 D.getIdentifier(), 5274 TInfo); 5275 5276 if (const TagType *TT = T->getAs<TagType>()) { 5277 TagDecl *TD = TT->getDecl(); 5278 5279 // If the TagDecl that the TypedefDecl points to is an anonymous decl 5280 // keep track of the TypedefDecl. 5281 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 5282 TD->setTypedefForAnonDecl(NewTD); 5283 } 5284 5285 if (D.isInvalidType()) 5286 NewTD->setInvalidDecl(); 5287 return NewTD; 5288} 5289 5290 5291/// \brief Determine whether a tag with a given kind is acceptable 5292/// as a redeclaration of the given tag declaration. 5293/// 5294/// \returns true if the new tag kind is acceptable, false otherwise. 5295bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 5296 TagTypeKind NewTag, 5297 SourceLocation NewTagLoc, 5298 const IdentifierInfo &Name) { 5299 // C++ [dcl.type.elab]p3: 5300 // The class-key or enum keyword present in the 5301 // elaborated-type-specifier shall agree in kind with the 5302 // declaration to which the name in the elaborated-type-specifier 5303 // refers. This rule also applies to the form of 5304 // elaborated-type-specifier that declares a class-name or 5305 // friend class since it can be construed as referring to the 5306 // definition of the class. Thus, in any 5307 // elaborated-type-specifier, the enum keyword shall be used to 5308 // refer to an enumeration (7.2), the union class-key shall be 5309 // used to refer to a union (clause 9), and either the class or 5310 // struct class-key shall be used to refer to a class (clause 9) 5311 // declared using the class or struct class-key. 5312 TagTypeKind OldTag = Previous->getTagKind(); 5313 if (OldTag == NewTag) 5314 return true; 5315 5316 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 5317 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 5318 // Warn about the struct/class tag mismatch. 5319 bool isTemplate = false; 5320 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 5321 isTemplate = Record->getDescribedClassTemplate(); 5322 5323 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 5324 << (NewTag == TTK_Class) 5325 << isTemplate << &Name 5326 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 5327 OldTag == TTK_Class? "class" : "struct"); 5328 Diag(Previous->getLocation(), diag::note_previous_use); 5329 return true; 5330 } 5331 return false; 5332} 5333 5334/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 5335/// former case, Name will be non-null. In the later case, Name will be null. 5336/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 5337/// reference/declaration/definition of a tag. 5338Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 5339 SourceLocation KWLoc, CXXScopeSpec &SS, 5340 IdentifierInfo *Name, SourceLocation NameLoc, 5341 AttributeList *Attr, AccessSpecifier AS, 5342 MultiTemplateParamsArg TemplateParameterLists, 5343 bool &OwnedDecl, bool &IsDependent) { 5344 // If this is not a definition, it must have a name. 5345 assert((Name != 0 || TUK == TUK_Definition) && 5346 "Nameless record must be a definition!"); 5347 5348 OwnedDecl = false; 5349 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 5350 5351 // FIXME: Check explicit specializations more carefully. 5352 bool isExplicitSpecialization = false; 5353 unsigned NumMatchedTemplateParamLists = TemplateParameterLists.size(); 5354 bool Invalid = false; 5355 if (TUK != TUK_Reference) { 5356 if (TemplateParameterList *TemplateParams 5357 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 5358 (TemplateParameterList**)TemplateParameterLists.get(), 5359 TemplateParameterLists.size(), 5360 TUK == TUK_Friend, 5361 isExplicitSpecialization, 5362 Invalid)) { 5363 // All but one template parameter lists have been matching. 5364 --NumMatchedTemplateParamLists; 5365 5366 if (TemplateParams->size() > 0) { 5367 // This is a declaration or definition of a class template (which may 5368 // be a member of another template). 5369 if (Invalid) 5370 return 0; 5371 5372 OwnedDecl = false; 5373 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 5374 SS, Name, NameLoc, Attr, 5375 TemplateParams, 5376 AS); 5377 TemplateParameterLists.release(); 5378 return Result.get(); 5379 } else { 5380 // The "template<>" header is extraneous. 5381 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 5382 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 5383 isExplicitSpecialization = true; 5384 } 5385 } 5386 } 5387 5388 DeclContext *SearchDC = CurContext; 5389 DeclContext *DC = CurContext; 5390 bool isStdBadAlloc = false; 5391 5392 RedeclarationKind Redecl = ForRedeclaration; 5393 if (TUK == TUK_Friend || TUK == TUK_Reference) 5394 Redecl = NotForRedeclaration; 5395 5396 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 5397 5398 if (Name && SS.isNotEmpty()) { 5399 // We have a nested-name tag ('struct foo::bar'). 5400 5401 // Check for invalid 'foo::'. 5402 if (SS.isInvalid()) { 5403 Name = 0; 5404 goto CreateNewDecl; 5405 } 5406 5407 // If this is a friend or a reference to a class in a dependent 5408 // context, don't try to make a decl for it. 5409 if (TUK == TUK_Friend || TUK == TUK_Reference) { 5410 DC = computeDeclContext(SS, false); 5411 if (!DC) { 5412 IsDependent = true; 5413 return 0; 5414 } 5415 } else { 5416 DC = computeDeclContext(SS, true); 5417 if (!DC) { 5418 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 5419 << SS.getRange(); 5420 return 0; 5421 } 5422 } 5423 5424 if (RequireCompleteDeclContext(SS, DC)) 5425 return 0; 5426 5427 SearchDC = DC; 5428 // Look-up name inside 'foo::'. 5429 LookupQualifiedName(Previous, DC); 5430 5431 if (Previous.isAmbiguous()) 5432 return 0; 5433 5434 if (Previous.empty()) { 5435 // Name lookup did not find anything. However, if the 5436 // nested-name-specifier refers to the current instantiation, 5437 // and that current instantiation has any dependent base 5438 // classes, we might find something at instantiation time: treat 5439 // this as a dependent elaborated-type-specifier. 5440 if (Previous.wasNotFoundInCurrentInstantiation()) { 5441 IsDependent = true; 5442 return 0; 5443 } 5444 5445 // A tag 'foo::bar' must already exist. 5446 Diag(NameLoc, diag::err_not_tag_in_scope) 5447 << Kind << Name << DC << SS.getRange(); 5448 Name = 0; 5449 Invalid = true; 5450 goto CreateNewDecl; 5451 } 5452 } else if (Name) { 5453 // If this is a named struct, check to see if there was a previous forward 5454 // declaration or definition. 5455 // FIXME: We're looking into outer scopes here, even when we 5456 // shouldn't be. Doing so can result in ambiguities that we 5457 // shouldn't be diagnosing. 5458 LookupName(Previous, S); 5459 5460 // Note: there used to be some attempt at recovery here. 5461 if (Previous.isAmbiguous()) 5462 return 0; 5463 5464 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 5465 // FIXME: This makes sure that we ignore the contexts associated 5466 // with C structs, unions, and enums when looking for a matching 5467 // tag declaration or definition. See the similar lookup tweak 5468 // in Sema::LookupName; is there a better way to deal with this? 5469 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 5470 SearchDC = SearchDC->getParent(); 5471 } 5472 } else if (S->isFunctionPrototypeScope()) { 5473 // If this is an enum declaration in function prototype scope, set its 5474 // initial context to the translation unit. 5475 SearchDC = Context.getTranslationUnitDecl(); 5476 } 5477 5478 if (Previous.isSingleResult() && 5479 Previous.getFoundDecl()->isTemplateParameter()) { 5480 // Maybe we will complain about the shadowed template parameter. 5481 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 5482 // Just pretend that we didn't see the previous declaration. 5483 Previous.clear(); 5484 } 5485 5486 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 5487 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 5488 // This is a declaration of or a reference to "std::bad_alloc". 5489 isStdBadAlloc = true; 5490 5491 if (Previous.empty() && StdBadAlloc) { 5492 // std::bad_alloc has been implicitly declared (but made invisible to 5493 // name lookup). Fill in this implicit declaration as the previous 5494 // declaration, so that the declarations get chained appropriately. 5495 Previous.addDecl(getStdBadAlloc()); 5496 } 5497 } 5498 5499 // If we didn't find a previous declaration, and this is a reference 5500 // (or friend reference), move to the correct scope. In C++, we 5501 // also need to do a redeclaration lookup there, just in case 5502 // there's a shadow friend decl. 5503 if (Name && Previous.empty() && 5504 (TUK == TUK_Reference || TUK == TUK_Friend)) { 5505 if (Invalid) goto CreateNewDecl; 5506 assert(SS.isEmpty()); 5507 5508 if (TUK == TUK_Reference) { 5509 // C++ [basic.scope.pdecl]p5: 5510 // -- for an elaborated-type-specifier of the form 5511 // 5512 // class-key identifier 5513 // 5514 // if the elaborated-type-specifier is used in the 5515 // decl-specifier-seq or parameter-declaration-clause of a 5516 // function defined in namespace scope, the identifier is 5517 // declared as a class-name in the namespace that contains 5518 // the declaration; otherwise, except as a friend 5519 // declaration, the identifier is declared in the smallest 5520 // non-class, non-function-prototype scope that contains the 5521 // declaration. 5522 // 5523 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 5524 // C structs and unions. 5525 // 5526 // It is an error in C++ to declare (rather than define) an enum 5527 // type, including via an elaborated type specifier. We'll 5528 // diagnose that later; for now, declare the enum in the same 5529 // scope as we would have picked for any other tag type. 5530 // 5531 // GNU C also supports this behavior as part of its incomplete 5532 // enum types extension, while GNU C++ does not. 5533 // 5534 // Find the context where we'll be declaring the tag. 5535 // FIXME: We would like to maintain the current DeclContext as the 5536 // lexical context, 5537 while (SearchDC->isRecord()) 5538 SearchDC = SearchDC->getParent(); 5539 5540 // Find the scope where we'll be declaring the tag. 5541 while (S->isClassScope() || 5542 (getLangOptions().CPlusPlus && 5543 S->isFunctionPrototypeScope()) || 5544 ((S->getFlags() & Scope::DeclScope) == 0) || 5545 (S->getEntity() && 5546 ((DeclContext *)S->getEntity())->isTransparentContext())) 5547 S = S->getParent(); 5548 } else { 5549 assert(TUK == TUK_Friend); 5550 // C++ [namespace.memdef]p3: 5551 // If a friend declaration in a non-local class first declares a 5552 // class or function, the friend class or function is a member of 5553 // the innermost enclosing namespace. 5554 SearchDC = SearchDC->getEnclosingNamespaceContext(); 5555 } 5556 5557 // In C++, we need to do a redeclaration lookup to properly 5558 // diagnose some problems. 5559 if (getLangOptions().CPlusPlus) { 5560 Previous.setRedeclarationKind(ForRedeclaration); 5561 LookupQualifiedName(Previous, SearchDC); 5562 } 5563 } 5564 5565 if (!Previous.empty()) { 5566 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 5567 5568 // It's okay to have a tag decl in the same scope as a typedef 5569 // which hides a tag decl in the same scope. Finding this 5570 // insanity with a redeclaration lookup can only actually happen 5571 // in C++. 5572 // 5573 // This is also okay for elaborated-type-specifiers, which is 5574 // technically forbidden by the current standard but which is 5575 // okay according to the likely resolution of an open issue; 5576 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 5577 if (getLangOptions().CPlusPlus) { 5578 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(PrevDecl)) { 5579 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 5580 TagDecl *Tag = TT->getDecl(); 5581 if (Tag->getDeclName() == Name && 5582 Tag->getDeclContext()->getRedeclContext() 5583 ->Equals(TD->getDeclContext()->getRedeclContext())) { 5584 PrevDecl = Tag; 5585 Previous.clear(); 5586 Previous.addDecl(Tag); 5587 Previous.resolveKind(); 5588 } 5589 } 5590 } 5591 } 5592 5593 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 5594 // If this is a use of a previous tag, or if the tag is already declared 5595 // in the same scope (so that the definition/declaration completes or 5596 // rementions the tag), reuse the decl. 5597 if (TUK == TUK_Reference || TUK == TUK_Friend || 5598 isDeclInScope(PrevDecl, SearchDC, S)) { 5599 // Make sure that this wasn't declared as an enum and now used as a 5600 // struct or something similar. 5601 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 5602 bool SafeToContinue 5603 = (PrevTagDecl->getTagKind() != TTK_Enum && 5604 Kind != TTK_Enum); 5605 if (SafeToContinue) 5606 Diag(KWLoc, diag::err_use_with_wrong_tag) 5607 << Name 5608 << FixItHint::CreateReplacement(SourceRange(KWLoc), 5609 PrevTagDecl->getKindName()); 5610 else 5611 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 5612 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 5613 5614 if (SafeToContinue) 5615 Kind = PrevTagDecl->getTagKind(); 5616 else { 5617 // Recover by making this an anonymous redefinition. 5618 Name = 0; 5619 Previous.clear(); 5620 Invalid = true; 5621 } 5622 } 5623 5624 if (!Invalid) { 5625 // If this is a use, just return the declaration we found. 5626 5627 // FIXME: In the future, return a variant or some other clue 5628 // for the consumer of this Decl to know it doesn't own it. 5629 // For our current ASTs this shouldn't be a problem, but will 5630 // need to be changed with DeclGroups. 5631 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) || 5632 TUK == TUK_Friend) 5633 return PrevTagDecl; 5634 5635 // Diagnose attempts to redefine a tag. 5636 if (TUK == TUK_Definition) { 5637 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 5638 // If we're defining a specialization and the previous definition 5639 // is from an implicit instantiation, don't emit an error 5640 // here; we'll catch this in the general case below. 5641 if (!isExplicitSpecialization || 5642 !isa<CXXRecordDecl>(Def) || 5643 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 5644 == TSK_ExplicitSpecialization) { 5645 Diag(NameLoc, diag::err_redefinition) << Name; 5646 Diag(Def->getLocation(), diag::note_previous_definition); 5647 // If this is a redefinition, recover by making this 5648 // struct be anonymous, which will make any later 5649 // references get the previous definition. 5650 Name = 0; 5651 Previous.clear(); 5652 Invalid = true; 5653 } 5654 } else { 5655 // If the type is currently being defined, complain 5656 // about a nested redefinition. 5657 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 5658 if (Tag->isBeingDefined()) { 5659 Diag(NameLoc, diag::err_nested_redefinition) << Name; 5660 Diag(PrevTagDecl->getLocation(), 5661 diag::note_previous_definition); 5662 Name = 0; 5663 Previous.clear(); 5664 Invalid = true; 5665 } 5666 } 5667 5668 // Okay, this is definition of a previously declared or referenced 5669 // tag PrevDecl. We're going to create a new Decl for it. 5670 } 5671 } 5672 // If we get here we have (another) forward declaration or we 5673 // have a definition. Just create a new decl. 5674 5675 } else { 5676 // If we get here, this is a definition of a new tag type in a nested 5677 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 5678 // new decl/type. We set PrevDecl to NULL so that the entities 5679 // have distinct types. 5680 Previous.clear(); 5681 } 5682 // If we get here, we're going to create a new Decl. If PrevDecl 5683 // is non-NULL, it's a definition of the tag declared by 5684 // PrevDecl. If it's NULL, we have a new definition. 5685 5686 5687 // Otherwise, PrevDecl is not a tag, but was found with tag 5688 // lookup. This is only actually possible in C++, where a few 5689 // things like templates still live in the tag namespace. 5690 } else { 5691 assert(getLangOptions().CPlusPlus); 5692 5693 // Use a better diagnostic if an elaborated-type-specifier 5694 // found the wrong kind of type on the first 5695 // (non-redeclaration) lookup. 5696 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 5697 !Previous.isForRedeclaration()) { 5698 unsigned Kind = 0; 5699 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5700 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5701 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 5702 Diag(PrevDecl->getLocation(), diag::note_declared_at); 5703 Invalid = true; 5704 5705 // Otherwise, only diagnose if the declaration is in scope. 5706 } else if (!isDeclInScope(PrevDecl, SearchDC, S)) { 5707 // do nothing 5708 5709 // Diagnose implicit declarations introduced by elaborated types. 5710 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 5711 unsigned Kind = 0; 5712 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5713 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5714 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 5715 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5716 Invalid = true; 5717 5718 // Otherwise it's a declaration. Call out a particularly common 5719 // case here. 5720 } else if (isa<TypedefDecl>(PrevDecl)) { 5721 Diag(NameLoc, diag::err_tag_definition_of_typedef) 5722 << Name 5723 << cast<TypedefDecl>(PrevDecl)->getUnderlyingType(); 5724 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5725 Invalid = true; 5726 5727 // Otherwise, diagnose. 5728 } else { 5729 // The tag name clashes with something else in the target scope, 5730 // issue an error and recover by making this tag be anonymous. 5731 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 5732 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5733 Name = 0; 5734 Invalid = true; 5735 } 5736 5737 // The existing declaration isn't relevant to us; we're in a 5738 // new scope, so clear out the previous declaration. 5739 Previous.clear(); 5740 } 5741 } 5742 5743CreateNewDecl: 5744 5745 TagDecl *PrevDecl = 0; 5746 if (Previous.isSingleResult()) 5747 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 5748 5749 // If there is an identifier, use the location of the identifier as the 5750 // location of the decl, otherwise use the location of the struct/union 5751 // keyword. 5752 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 5753 5754 // Otherwise, create a new declaration. If there is a previous 5755 // declaration of the same entity, the two will be linked via 5756 // PrevDecl. 5757 TagDecl *New; 5758 5759 if (Kind == TTK_Enum) { 5760 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5761 // enum X { A, B, C } D; D should chain to X. 5762 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 5763 cast_or_null<EnumDecl>(PrevDecl)); 5764 // If this is an undefined enum, warn. 5765 if (TUK != TUK_Definition && !Invalid) { 5766 TagDecl *Def; 5767 if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 5768 Diag(Loc, diag::ext_forward_ref_enum_def) 5769 << New; 5770 Diag(Def->getLocation(), diag::note_previous_definition); 5771 } else { 5772 unsigned DiagID = diag::ext_forward_ref_enum; 5773 if (getLangOptions().Microsoft) 5774 DiagID = diag::ext_ms_forward_ref_enum; 5775 else if (getLangOptions().CPlusPlus) 5776 DiagID = diag::err_forward_ref_enum; 5777 Diag(Loc, DiagID); 5778 } 5779 } 5780 } else { 5781 // struct/union/class 5782 5783 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5784 // struct X { int A; } D; D should chain to X. 5785 if (getLangOptions().CPlusPlus) { 5786 // FIXME: Look for a way to use RecordDecl for simple structs. 5787 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5788 cast_or_null<CXXRecordDecl>(PrevDecl)); 5789 5790 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 5791 StdBadAlloc = cast<CXXRecordDecl>(New); 5792 } else 5793 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5794 cast_or_null<RecordDecl>(PrevDecl)); 5795 } 5796 5797 // Maybe add qualifier info. 5798 if (SS.isNotEmpty()) { 5799 if (SS.isSet()) { 5800 NestedNameSpecifier *NNS 5801 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5802 New->setQualifierInfo(NNS, SS.getRange()); 5803 if (NumMatchedTemplateParamLists > 0) { 5804 New->setTemplateParameterListsInfo(Context, 5805 NumMatchedTemplateParamLists, 5806 (TemplateParameterList**) TemplateParameterLists.release()); 5807 } 5808 } 5809 else 5810 Invalid = true; 5811 } 5812 5813 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 5814 // Add alignment attributes if necessary; these attributes are checked when 5815 // the ASTContext lays out the structure. 5816 // 5817 // It is important for implementing the correct semantics that this 5818 // happen here (in act on tag decl). The #pragma pack stack is 5819 // maintained as a result of parser callbacks which can occur at 5820 // many points during the parsing of a struct declaration (because 5821 // the #pragma tokens are effectively skipped over during the 5822 // parsing of the struct). 5823 AddAlignmentAttributesForRecord(RD); 5824 } 5825 5826 // If this is a specialization of a member class (of a class template), 5827 // check the specialization. 5828 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 5829 Invalid = true; 5830 5831 if (Invalid) 5832 New->setInvalidDecl(); 5833 5834 if (Attr) 5835 ProcessDeclAttributeList(S, New, Attr); 5836 5837 // If we're declaring or defining a tag in function prototype scope 5838 // in C, note that this type can only be used within the function. 5839 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 5840 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 5841 5842 // Set the lexical context. If the tag has a C++ scope specifier, the 5843 // lexical context will be different from the semantic context. 5844 New->setLexicalDeclContext(CurContext); 5845 5846 // Mark this as a friend decl if applicable. 5847 if (TUK == TUK_Friend) 5848 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 5849 5850 // Set the access specifier. 5851 if (!Invalid && SearchDC->isRecord()) 5852 SetMemberAccessSpecifier(New, PrevDecl, AS); 5853 5854 if (TUK == TUK_Definition) 5855 New->startDefinition(); 5856 5857 // If this has an identifier, add it to the scope stack. 5858 if (TUK == TUK_Friend) { 5859 // We might be replacing an existing declaration in the lookup tables; 5860 // if so, borrow its access specifier. 5861 if (PrevDecl) 5862 New->setAccess(PrevDecl->getAccess()); 5863 5864 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 5865 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 5866 if (Name) // can be null along some error paths 5867 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5868 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 5869 } else if (Name) { 5870 S = getNonFieldDeclScope(S); 5871 PushOnScopeChains(New, S); 5872 } else { 5873 CurContext->addDecl(New); 5874 } 5875 5876 // If this is the C FILE type, notify the AST context. 5877 if (IdentifierInfo *II = New->getIdentifier()) 5878 if (!New->isInvalidDecl() && 5879 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 5880 II->isStr("FILE")) 5881 Context.setFILEDecl(New); 5882 5883 OwnedDecl = true; 5884 return New; 5885} 5886 5887void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 5888 AdjustDeclIfTemplate(TagD); 5889 TagDecl *Tag = cast<TagDecl>(TagD); 5890 5891 // Enter the tag context. 5892 PushDeclContext(S, Tag); 5893} 5894 5895void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 5896 SourceLocation LBraceLoc) { 5897 AdjustDeclIfTemplate(TagD); 5898 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 5899 5900 FieldCollector->StartClass(); 5901 5902 if (!Record->getIdentifier()) 5903 return; 5904 5905 // C++ [class]p2: 5906 // [...] The class-name is also inserted into the scope of the 5907 // class itself; this is known as the injected-class-name. For 5908 // purposes of access checking, the injected-class-name is treated 5909 // as if it were a public member name. 5910 CXXRecordDecl *InjectedClassName 5911 = CXXRecordDecl::Create(Context, Record->getTagKind(), 5912 CurContext, Record->getLocation(), 5913 Record->getIdentifier(), 5914 Record->getTagKeywordLoc(), 5915 Record); 5916 InjectedClassName->setImplicit(); 5917 InjectedClassName->setAccess(AS_public); 5918 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 5919 InjectedClassName->setDescribedClassTemplate(Template); 5920 PushOnScopeChains(InjectedClassName, S); 5921 assert(InjectedClassName->isInjectedClassName() && 5922 "Broken injected-class-name"); 5923} 5924 5925void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 5926 SourceLocation RBraceLoc) { 5927 AdjustDeclIfTemplate(TagD); 5928 TagDecl *Tag = cast<TagDecl>(TagD); 5929 Tag->setRBraceLoc(RBraceLoc); 5930 5931 if (isa<CXXRecordDecl>(Tag)) 5932 FieldCollector->FinishClass(); 5933 5934 // Exit this scope of this tag's definition. 5935 PopDeclContext(); 5936 5937 // Notify the consumer that we've defined a tag. 5938 Consumer.HandleTagDeclDefinition(Tag); 5939} 5940 5941void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 5942 AdjustDeclIfTemplate(TagD); 5943 TagDecl *Tag = cast<TagDecl>(TagD); 5944 Tag->setInvalidDecl(); 5945 5946 // We're undoing ActOnTagStartDefinition here, not 5947 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 5948 // the FieldCollector. 5949 5950 PopDeclContext(); 5951} 5952 5953// Note that FieldName may be null for anonymous bitfields. 5954bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 5955 QualType FieldTy, const Expr *BitWidth, 5956 bool *ZeroWidth) { 5957 // Default to true; that shouldn't confuse checks for emptiness 5958 if (ZeroWidth) 5959 *ZeroWidth = true; 5960 5961 // C99 6.7.2.1p4 - verify the field type. 5962 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 5963 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 5964 // Handle incomplete types with specific error. 5965 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 5966 return true; 5967 if (FieldName) 5968 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 5969 << FieldName << FieldTy << BitWidth->getSourceRange(); 5970 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 5971 << FieldTy << BitWidth->getSourceRange(); 5972 } 5973 5974 // If the bit-width is type- or value-dependent, don't try to check 5975 // it now. 5976 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 5977 return false; 5978 5979 llvm::APSInt Value; 5980 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 5981 return true; 5982 5983 if (Value != 0 && ZeroWidth) 5984 *ZeroWidth = false; 5985 5986 // Zero-width bitfield is ok for anonymous field. 5987 if (Value == 0 && FieldName) 5988 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 5989 5990 if (Value.isSigned() && Value.isNegative()) { 5991 if (FieldName) 5992 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 5993 << FieldName << Value.toString(10); 5994 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 5995 << Value.toString(10); 5996 } 5997 5998 if (!FieldTy->isDependentType()) { 5999 uint64_t TypeSize = Context.getTypeSize(FieldTy); 6000 if (Value.getZExtValue() > TypeSize) { 6001 if (!getLangOptions().CPlusPlus) { 6002 if (FieldName) 6003 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 6004 << FieldName << (unsigned)Value.getZExtValue() 6005 << (unsigned)TypeSize; 6006 6007 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 6008 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 6009 } 6010 6011 if (FieldName) 6012 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 6013 << FieldName << (unsigned)Value.getZExtValue() 6014 << (unsigned)TypeSize; 6015 else 6016 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 6017 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 6018 } 6019 } 6020 6021 return false; 6022} 6023 6024/// ActOnField - Each field of a struct/union/class is passed into this in order 6025/// to create a FieldDecl object for it. 6026Decl *Sema::ActOnField(Scope *S, Decl *TagD, 6027 SourceLocation DeclStart, 6028 Declarator &D, ExprTy *BitfieldWidth) { 6029 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 6030 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 6031 AS_public); 6032 return Res; 6033} 6034 6035/// HandleField - Analyze a field of a C struct or a C++ data member. 6036/// 6037FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 6038 SourceLocation DeclStart, 6039 Declarator &D, Expr *BitWidth, 6040 AccessSpecifier AS) { 6041 IdentifierInfo *II = D.getIdentifier(); 6042 SourceLocation Loc = DeclStart; 6043 if (II) Loc = D.getIdentifierLoc(); 6044 6045 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6046 QualType T = TInfo->getType(); 6047 if (getLangOptions().CPlusPlus) 6048 CheckExtraCXXDefaultArguments(D); 6049 6050 DiagnoseFunctionSpecifiers(D); 6051 6052 if (D.getDeclSpec().isThreadSpecified()) 6053 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6054 6055 // Check to see if this name was declared as a member previously 6056 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 6057 LookupName(Previous, S); 6058 assert((Previous.empty() || Previous.isOverloadedResult() || 6059 Previous.isSingleResult()) 6060 && "Lookup of member name should be either overloaded, single or null"); 6061 6062 // If the name is overloaded then get any declaration else get the single result 6063 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 6064 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 6065 6066 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6067 // Maybe we will complain about the shadowed template parameter. 6068 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6069 // Just pretend that we didn't see the previous declaration. 6070 PrevDecl = 0; 6071 } 6072 6073 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 6074 PrevDecl = 0; 6075 6076 bool Mutable 6077 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 6078 SourceLocation TSSL = D.getSourceRange().getBegin(); 6079 FieldDecl *NewFD 6080 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 6081 AS, PrevDecl, &D); 6082 6083 if (NewFD->isInvalidDecl()) 6084 Record->setInvalidDecl(); 6085 6086 if (NewFD->isInvalidDecl() && PrevDecl) { 6087 // Don't introduce NewFD into scope; there's already something 6088 // with the same name in the same scope. 6089 } else if (II) { 6090 PushOnScopeChains(NewFD, S); 6091 } else 6092 Record->addDecl(NewFD); 6093 6094 return NewFD; 6095} 6096 6097/// \brief Build a new FieldDecl and check its well-formedness. 6098/// 6099/// This routine builds a new FieldDecl given the fields name, type, 6100/// record, etc. \p PrevDecl should refer to any previous declaration 6101/// with the same name and in the same scope as the field to be 6102/// created. 6103/// 6104/// \returns a new FieldDecl. 6105/// 6106/// \todo The Declarator argument is a hack. It will be removed once 6107FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 6108 TypeSourceInfo *TInfo, 6109 RecordDecl *Record, SourceLocation Loc, 6110 bool Mutable, Expr *BitWidth, 6111 SourceLocation TSSL, 6112 AccessSpecifier AS, NamedDecl *PrevDecl, 6113 Declarator *D) { 6114 IdentifierInfo *II = Name.getAsIdentifierInfo(); 6115 bool InvalidDecl = false; 6116 if (D) InvalidDecl = D->isInvalidType(); 6117 6118 // If we receive a broken type, recover by assuming 'int' and 6119 // marking this declaration as invalid. 6120 if (T.isNull()) { 6121 InvalidDecl = true; 6122 T = Context.IntTy; 6123 } 6124 6125 QualType EltTy = Context.getBaseElementType(T); 6126 if (!EltTy->isDependentType() && 6127 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 6128 // Fields of incomplete type force their record to be invalid. 6129 Record->setInvalidDecl(); 6130 InvalidDecl = true; 6131 } 6132 6133 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6134 // than a variably modified type. 6135 if (!InvalidDecl && T->isVariablyModifiedType()) { 6136 bool SizeIsNegative; 6137 llvm::APSInt Oversized; 6138 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 6139 SizeIsNegative, 6140 Oversized); 6141 if (!FixedTy.isNull()) { 6142 Diag(Loc, diag::warn_illegal_constant_array_size); 6143 T = FixedTy; 6144 } else { 6145 if (SizeIsNegative) 6146 Diag(Loc, diag::err_typecheck_negative_array_size); 6147 else if (Oversized.getBoolValue()) 6148 Diag(Loc, diag::err_array_too_large) 6149 << Oversized.toString(10); 6150 else 6151 Diag(Loc, diag::err_typecheck_field_variable_size); 6152 InvalidDecl = true; 6153 } 6154 } 6155 6156 // Fields can not have abstract class types 6157 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 6158 diag::err_abstract_type_in_decl, 6159 AbstractFieldType)) 6160 InvalidDecl = true; 6161 6162 bool ZeroWidth = false; 6163 // If this is declared as a bit-field, check the bit-field. 6164 if (!InvalidDecl && BitWidth && 6165 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 6166 InvalidDecl = true; 6167 BitWidth = 0; 6168 ZeroWidth = false; 6169 } 6170 6171 // Check that 'mutable' is consistent with the type of the declaration. 6172 if (!InvalidDecl && Mutable) { 6173 unsigned DiagID = 0; 6174 if (T->isReferenceType()) 6175 DiagID = diag::err_mutable_reference; 6176 else if (T.isConstQualified()) 6177 DiagID = diag::err_mutable_const; 6178 6179 if (DiagID) { 6180 SourceLocation ErrLoc = Loc; 6181 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 6182 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 6183 Diag(ErrLoc, DiagID); 6184 Mutable = false; 6185 InvalidDecl = true; 6186 } 6187 } 6188 6189 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 6190 BitWidth, Mutable); 6191 if (InvalidDecl) 6192 NewFD->setInvalidDecl(); 6193 6194 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 6195 Diag(Loc, diag::err_duplicate_member) << II; 6196 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6197 NewFD->setInvalidDecl(); 6198 } 6199 6200 if (!InvalidDecl && getLangOptions().CPlusPlus) { 6201 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6202 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6203 if (RDecl->getDefinition()) { 6204 // C++ 9.5p1: An object of a class with a non-trivial 6205 // constructor, a non-trivial copy constructor, a non-trivial 6206 // destructor, or a non-trivial copy assignment operator 6207 // cannot be a member of a union, nor can an array of such 6208 // objects. 6209 // TODO: C++0x alters this restriction significantly. 6210 if (Record->isUnion() && CheckNontrivialField(NewFD)) 6211 NewFD->setInvalidDecl(); 6212 } 6213 } 6214 } 6215 6216 // FIXME: We need to pass in the attributes given an AST 6217 // representation, not a parser representation. 6218 if (D) 6219 // FIXME: What to pass instead of TUScope? 6220 ProcessDeclAttributes(TUScope, NewFD, *D); 6221 6222 if (T.isObjCGCWeak()) 6223 Diag(Loc, diag::warn_attribute_weak_on_field); 6224 6225 NewFD->setAccess(AS); 6226 return NewFD; 6227} 6228 6229bool Sema::CheckNontrivialField(FieldDecl *FD) { 6230 assert(FD); 6231 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 6232 6233 if (FD->isInvalidDecl()) 6234 return true; 6235 6236 QualType EltTy = Context.getBaseElementType(FD->getType()); 6237 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6238 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6239 if (RDecl->getDefinition()) { 6240 // We check for copy constructors before constructors 6241 // because otherwise we'll never get complaints about 6242 // copy constructors. 6243 6244 CXXSpecialMember member = CXXInvalid; 6245 if (!RDecl->hasTrivialCopyConstructor()) 6246 member = CXXCopyConstructor; 6247 else if (!RDecl->hasTrivialConstructor()) 6248 member = CXXConstructor; 6249 else if (!RDecl->hasTrivialCopyAssignment()) 6250 member = CXXCopyAssignment; 6251 else if (!RDecl->hasTrivialDestructor()) 6252 member = CXXDestructor; 6253 6254 if (member != CXXInvalid) { 6255 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 6256 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 6257 DiagnoseNontrivial(RT, member); 6258 return true; 6259 } 6260 } 6261 } 6262 6263 return false; 6264} 6265 6266/// DiagnoseNontrivial - Given that a class has a non-trivial 6267/// special member, figure out why. 6268void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 6269 QualType QT(T, 0U); 6270 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 6271 6272 // Check whether the member was user-declared. 6273 switch (member) { 6274 case CXXInvalid: 6275 break; 6276 6277 case CXXConstructor: 6278 if (RD->hasUserDeclaredConstructor()) { 6279 typedef CXXRecordDecl::ctor_iterator ctor_iter; 6280 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 6281 const FunctionDecl *body = 0; 6282 ci->hasBody(body); 6283 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 6284 SourceLocation CtorLoc = ci->getLocation(); 6285 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6286 return; 6287 } 6288 } 6289 6290 assert(0 && "found no user-declared constructors"); 6291 return; 6292 } 6293 break; 6294 6295 case CXXCopyConstructor: 6296 if (RD->hasUserDeclaredCopyConstructor()) { 6297 SourceLocation CtorLoc = 6298 RD->getCopyConstructor(Context, 0)->getLocation(); 6299 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6300 return; 6301 } 6302 break; 6303 6304 case CXXCopyAssignment: 6305 if (RD->hasUserDeclaredCopyAssignment()) { 6306 // FIXME: this should use the location of the copy 6307 // assignment, not the type. 6308 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 6309 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 6310 return; 6311 } 6312 break; 6313 6314 case CXXDestructor: 6315 if (RD->hasUserDeclaredDestructor()) { 6316 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 6317 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6318 return; 6319 } 6320 break; 6321 } 6322 6323 typedef CXXRecordDecl::base_class_iterator base_iter; 6324 6325 // Virtual bases and members inhibit trivial copying/construction, 6326 // but not trivial destruction. 6327 if (member != CXXDestructor) { 6328 // Check for virtual bases. vbases includes indirect virtual bases, 6329 // so we just iterate through the direct bases. 6330 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 6331 if (bi->isVirtual()) { 6332 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6333 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 6334 return; 6335 } 6336 6337 // Check for virtual methods. 6338 typedef CXXRecordDecl::method_iterator meth_iter; 6339 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 6340 ++mi) { 6341 if (mi->isVirtual()) { 6342 SourceLocation MLoc = mi->getSourceRange().getBegin(); 6343 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 6344 return; 6345 } 6346 } 6347 } 6348 6349 bool (CXXRecordDecl::*hasTrivial)() const; 6350 switch (member) { 6351 case CXXConstructor: 6352 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 6353 case CXXCopyConstructor: 6354 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 6355 case CXXCopyAssignment: 6356 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 6357 case CXXDestructor: 6358 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 6359 default: 6360 assert(0 && "unexpected special member"); return; 6361 } 6362 6363 // Check for nontrivial bases (and recurse). 6364 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 6365 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 6366 assert(BaseRT && "Don't know how to handle dependent bases"); 6367 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 6368 if (!(BaseRecTy->*hasTrivial)()) { 6369 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6370 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 6371 DiagnoseNontrivial(BaseRT, member); 6372 return; 6373 } 6374 } 6375 6376 // Check for nontrivial members (and recurse). 6377 typedef RecordDecl::field_iterator field_iter; 6378 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 6379 ++fi) { 6380 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 6381 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 6382 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 6383 6384 if (!(EltRD->*hasTrivial)()) { 6385 SourceLocation FLoc = (*fi)->getLocation(); 6386 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 6387 DiagnoseNontrivial(EltRT, member); 6388 return; 6389 } 6390 } 6391 } 6392 6393 assert(0 && "found no explanation for non-trivial member"); 6394} 6395 6396/// TranslateIvarVisibility - Translate visibility from a token ID to an 6397/// AST enum value. 6398static ObjCIvarDecl::AccessControl 6399TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 6400 switch (ivarVisibility) { 6401 default: assert(0 && "Unknown visitibility kind"); 6402 case tok::objc_private: return ObjCIvarDecl::Private; 6403 case tok::objc_public: return ObjCIvarDecl::Public; 6404 case tok::objc_protected: return ObjCIvarDecl::Protected; 6405 case tok::objc_package: return ObjCIvarDecl::Package; 6406 } 6407} 6408 6409/// ActOnIvar - Each ivar field of an objective-c class is passed into this 6410/// in order to create an IvarDecl object for it. 6411Decl *Sema::ActOnIvar(Scope *S, 6412 SourceLocation DeclStart, 6413 Decl *IntfDecl, 6414 Declarator &D, ExprTy *BitfieldWidth, 6415 tok::ObjCKeywordKind Visibility) { 6416 6417 IdentifierInfo *II = D.getIdentifier(); 6418 Expr *BitWidth = (Expr*)BitfieldWidth; 6419 SourceLocation Loc = DeclStart; 6420 if (II) Loc = D.getIdentifierLoc(); 6421 6422 // FIXME: Unnamed fields can be handled in various different ways, for 6423 // example, unnamed unions inject all members into the struct namespace! 6424 6425 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6426 QualType T = TInfo->getType(); 6427 6428 if (BitWidth) { 6429 // 6.7.2.1p3, 6.7.2.1p4 6430 if (VerifyBitField(Loc, II, T, BitWidth)) { 6431 D.setInvalidType(); 6432 BitWidth = 0; 6433 } 6434 } else { 6435 // Not a bitfield. 6436 6437 // validate II. 6438 6439 } 6440 if (T->isReferenceType()) { 6441 Diag(Loc, diag::err_ivar_reference_type); 6442 D.setInvalidType(); 6443 } 6444 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6445 // than a variably modified type. 6446 else if (T->isVariablyModifiedType()) { 6447 Diag(Loc, diag::err_typecheck_ivar_variable_size); 6448 D.setInvalidType(); 6449 } 6450 6451 // Get the visibility (access control) for this ivar. 6452 ObjCIvarDecl::AccessControl ac = 6453 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 6454 : ObjCIvarDecl::None; 6455 // Must set ivar's DeclContext to its enclosing interface. 6456 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(IntfDecl); 6457 ObjCContainerDecl *EnclosingContext; 6458 if (ObjCImplementationDecl *IMPDecl = 6459 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6460 if (!LangOpts.ObjCNonFragileABI2) { 6461 // Case of ivar declared in an implementation. Context is that of its class. 6462 EnclosingContext = IMPDecl->getClassInterface(); 6463 assert(EnclosingContext && "Implementation has no class interface!"); 6464 } 6465 else 6466 EnclosingContext = EnclosingDecl; 6467 } else { 6468 if (ObjCCategoryDecl *CDecl = 6469 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6470 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 6471 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 6472 return 0; 6473 } 6474 } 6475 EnclosingContext = EnclosingDecl; 6476 } 6477 6478 // Construct the decl. 6479 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 6480 EnclosingContext, Loc, II, T, 6481 TInfo, ac, (Expr *)BitfieldWidth); 6482 6483 if (II) { 6484 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 6485 ForRedeclaration); 6486 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 6487 && !isa<TagDecl>(PrevDecl)) { 6488 Diag(Loc, diag::err_duplicate_member) << II; 6489 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6490 NewID->setInvalidDecl(); 6491 } 6492 } 6493 6494 // Process attributes attached to the ivar. 6495 ProcessDeclAttributes(S, NewID, D); 6496 6497 if (D.isInvalidType()) 6498 NewID->setInvalidDecl(); 6499 6500 if (II) { 6501 // FIXME: When interfaces are DeclContexts, we'll need to add 6502 // these to the interface. 6503 S->AddDecl(NewID); 6504 IdResolver.AddDecl(NewID); 6505 } 6506 6507 return NewID; 6508} 6509 6510/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 6511/// class and class extensions. For every class @interface and class 6512/// extension @interface, if the last ivar is a bitfield of any type, 6513/// then add an implicit `char :0` ivar to the end of that interface. 6514void Sema::ActOnLastBitfield(SourceLocation DeclLoc, Decl *EnclosingDecl, 6515 llvm::SmallVectorImpl<Decl *> &AllIvarDecls) { 6516 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 6517 return; 6518 6519 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 6520 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 6521 6522 if (!Ivar->isBitField()) 6523 return; 6524 uint64_t BitFieldSize = 6525 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 6526 if (BitFieldSize == 0) 6527 return; 6528 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl); 6529 if (!ID) { 6530 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6531 if (!CD->IsClassExtension()) 6532 return; 6533 } 6534 // No need to add this to end of @implementation. 6535 else 6536 return; 6537 } 6538 // All conditions are met. Add a new bitfield to the tail end of ivars. 6539 llvm::APInt Zero(Context.getTypeSize(Context.CharTy), 0); 6540 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.CharTy, DeclLoc); 6541 6542 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(EnclosingDecl), 6543 DeclLoc, 0, 6544 Context.CharTy, 6545 Context.CreateTypeSourceInfo(Context.CharTy), 6546 ObjCIvarDecl::Private, BW, 6547 true); 6548 AllIvarDecls.push_back(Ivar); 6549} 6550 6551void Sema::ActOnFields(Scope* S, 6552 SourceLocation RecLoc, Decl *EnclosingDecl, 6553 Decl **Fields, unsigned NumFields, 6554 SourceLocation LBrac, SourceLocation RBrac, 6555 AttributeList *Attr) { 6556 assert(EnclosingDecl && "missing record or interface decl"); 6557 6558 // If the decl this is being inserted into is invalid, then it may be a 6559 // redeclaration or some other bogus case. Don't try to add fields to it. 6560 if (EnclosingDecl->isInvalidDecl()) { 6561 // FIXME: Deallocate fields? 6562 return; 6563 } 6564 6565 6566 // Verify that all the fields are okay. 6567 unsigned NumNamedMembers = 0; 6568 llvm::SmallVector<FieldDecl*, 32> RecFields; 6569 6570 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 6571 for (unsigned i = 0; i != NumFields; ++i) { 6572 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 6573 6574 // Get the type for the field. 6575 Type *FDTy = FD->getType().getTypePtr(); 6576 6577 if (!FD->isAnonymousStructOrUnion()) { 6578 // Remember all fields written by the user. 6579 RecFields.push_back(FD); 6580 } 6581 6582 // If the field is already invalid for some reason, don't emit more 6583 // diagnostics about it. 6584 if (FD->isInvalidDecl()) { 6585 EnclosingDecl->setInvalidDecl(); 6586 continue; 6587 } 6588 6589 // C99 6.7.2.1p2: 6590 // A structure or union shall not contain a member with 6591 // incomplete or function type (hence, a structure shall not 6592 // contain an instance of itself, but may contain a pointer to 6593 // an instance of itself), except that the last member of a 6594 // structure with more than one named member may have incomplete 6595 // array type; such a structure (and any union containing, 6596 // possibly recursively, a member that is such a structure) 6597 // shall not be a member of a structure or an element of an 6598 // array. 6599 if (FDTy->isFunctionType()) { 6600 // Field declared as a function. 6601 Diag(FD->getLocation(), diag::err_field_declared_as_function) 6602 << FD->getDeclName(); 6603 FD->setInvalidDecl(); 6604 EnclosingDecl->setInvalidDecl(); 6605 continue; 6606 } else if (FDTy->isIncompleteArrayType() && Record && 6607 ((i == NumFields - 1 && !Record->isUnion()) || 6608 (getLangOptions().Microsoft && 6609 (i == NumFields - 1 || Record->isUnion())))) { 6610 // Flexible array member. 6611 // Microsoft is more permissive regarding flexible array. 6612 // It will accept flexible array in union and also 6613 // as the sole element of a struct/class. 6614 if (getLangOptions().Microsoft) { 6615 if (Record->isUnion()) 6616 Diag(FD->getLocation(), diag::ext_flexible_array_union) 6617 << FD->getDeclName(); 6618 else if (NumFields == 1) 6619 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate) 6620 << FD->getDeclName() << Record->getTagKind(); 6621 } else if (NumNamedMembers < 1) { 6622 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 6623 << FD->getDeclName(); 6624 FD->setInvalidDecl(); 6625 EnclosingDecl->setInvalidDecl(); 6626 continue; 6627 } 6628 if (!FD->getType()->isDependentType() && 6629 !Context.getBaseElementType(FD->getType())->isPODType()) { 6630 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 6631 << FD->getDeclName() << FD->getType(); 6632 FD->setInvalidDecl(); 6633 EnclosingDecl->setInvalidDecl(); 6634 continue; 6635 } 6636 // Okay, we have a legal flexible array member at the end of the struct. 6637 if (Record) 6638 Record->setHasFlexibleArrayMember(true); 6639 } else if (!FDTy->isDependentType() && 6640 RequireCompleteType(FD->getLocation(), FD->getType(), 6641 diag::err_field_incomplete)) { 6642 // Incomplete type 6643 FD->setInvalidDecl(); 6644 EnclosingDecl->setInvalidDecl(); 6645 continue; 6646 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 6647 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 6648 // If this is a member of a union, then entire union becomes "flexible". 6649 if (Record && Record->isUnion()) { 6650 Record->setHasFlexibleArrayMember(true); 6651 } else { 6652 // If this is a struct/class and this is not the last element, reject 6653 // it. Note that GCC supports variable sized arrays in the middle of 6654 // structures. 6655 if (i != NumFields-1) 6656 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 6657 << FD->getDeclName() << FD->getType(); 6658 else { 6659 // We support flexible arrays at the end of structs in 6660 // other structs as an extension. 6661 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 6662 << FD->getDeclName(); 6663 if (Record) 6664 Record->setHasFlexibleArrayMember(true); 6665 } 6666 } 6667 } 6668 if (Record && FDTTy->getDecl()->hasObjectMember()) 6669 Record->setHasObjectMember(true); 6670 } else if (FDTy->isObjCObjectType()) { 6671 /// A field cannot be an Objective-c object 6672 Diag(FD->getLocation(), diag::err_statically_allocated_object); 6673 FD->setInvalidDecl(); 6674 EnclosingDecl->setInvalidDecl(); 6675 continue; 6676 } else if (getLangOptions().ObjC1 && 6677 getLangOptions().getGCMode() != LangOptions::NonGC && 6678 Record && 6679 (FD->getType()->isObjCObjectPointerType() || 6680 FD->getType().isObjCGCStrong())) 6681 Record->setHasObjectMember(true); 6682 else if (Context.getAsArrayType(FD->getType())) { 6683 QualType BaseType = Context.getBaseElementType(FD->getType()); 6684 if (Record && BaseType->isRecordType() && 6685 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 6686 Record->setHasObjectMember(true); 6687 } 6688 // Keep track of the number of named members. 6689 if (FD->getIdentifier()) 6690 ++NumNamedMembers; 6691 } 6692 6693 // Okay, we successfully defined 'Record'. 6694 if (Record) { 6695 bool Completed = false; 6696 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 6697 if (!CXXRecord->isInvalidDecl()) { 6698 // Set access bits correctly on the directly-declared conversions. 6699 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 6700 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 6701 I != E; ++I) 6702 Convs->setAccess(I, (*I)->getAccess()); 6703 6704 if (!CXXRecord->isDependentType()) { 6705 // Add any implicitly-declared members to this class. 6706 AddImplicitlyDeclaredMembersToClass(CXXRecord); 6707 6708 // If we have virtual base classes, we may end up finding multiple 6709 // final overriders for a given virtual function. Check for this 6710 // problem now. 6711 if (CXXRecord->getNumVBases()) { 6712 CXXFinalOverriderMap FinalOverriders; 6713 CXXRecord->getFinalOverriders(FinalOverriders); 6714 6715 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 6716 MEnd = FinalOverriders.end(); 6717 M != MEnd; ++M) { 6718 for (OverridingMethods::iterator SO = M->second.begin(), 6719 SOEnd = M->second.end(); 6720 SO != SOEnd; ++SO) { 6721 assert(SO->second.size() > 0 && 6722 "Virtual function without overridding functions?"); 6723 if (SO->second.size() == 1) 6724 continue; 6725 6726 // C++ [class.virtual]p2: 6727 // In a derived class, if a virtual member function of a base 6728 // class subobject has more than one final overrider the 6729 // program is ill-formed. 6730 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 6731 << (NamedDecl *)M->first << Record; 6732 Diag(M->first->getLocation(), 6733 diag::note_overridden_virtual_function); 6734 for (OverridingMethods::overriding_iterator 6735 OM = SO->second.begin(), 6736 OMEnd = SO->second.end(); 6737 OM != OMEnd; ++OM) 6738 Diag(OM->Method->getLocation(), diag::note_final_overrider) 6739 << (NamedDecl *)M->first << OM->Method->getParent(); 6740 6741 Record->setInvalidDecl(); 6742 } 6743 } 6744 CXXRecord->completeDefinition(&FinalOverriders); 6745 Completed = true; 6746 } 6747 } 6748 } 6749 } 6750 6751 if (!Completed) 6752 Record->completeDefinition(); 6753 } else { 6754 ObjCIvarDecl **ClsFields = 6755 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 6756 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 6757 ID->setLocEnd(RBrac); 6758 // Add ivar's to class's DeclContext. 6759 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6760 ClsFields[i]->setLexicalDeclContext(ID); 6761 ID->addDecl(ClsFields[i]); 6762 } 6763 // Must enforce the rule that ivars in the base classes may not be 6764 // duplicates. 6765 if (ID->getSuperClass()) 6766 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 6767 } else if (ObjCImplementationDecl *IMPDecl = 6768 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6769 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 6770 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 6771 // Ivar declared in @implementation never belongs to the implementation. 6772 // Only it is in implementation's lexical context. 6773 ClsFields[I]->setLexicalDeclContext(IMPDecl); 6774 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 6775 } else if (ObjCCategoryDecl *CDecl = 6776 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6777 // case of ivars in class extension; all other cases have been 6778 // reported as errors elsewhere. 6779 // FIXME. Class extension does not have a LocEnd field. 6780 // CDecl->setLocEnd(RBrac); 6781 // Add ivar's to class extension's DeclContext. 6782 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6783 ClsFields[i]->setLexicalDeclContext(CDecl); 6784 CDecl->addDecl(ClsFields[i]); 6785 } 6786 } 6787 } 6788 6789 if (Attr) 6790 ProcessDeclAttributeList(S, Record, Attr); 6791 6792 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 6793 // set the visibility of this record. 6794 if (Record && !Record->getDeclContext()->isRecord()) 6795 AddPushedVisibilityAttribute(Record); 6796} 6797 6798/// \brief Determine whether the given integral value is representable within 6799/// the given type T. 6800static bool isRepresentableIntegerValue(ASTContext &Context, 6801 llvm::APSInt &Value, 6802 QualType T) { 6803 assert(T->isIntegralType(Context) && "Integral type required!"); 6804 unsigned BitWidth = Context.getIntWidth(T); 6805 6806 if (Value.isUnsigned() || Value.isNonNegative()) 6807 return Value.getActiveBits() < BitWidth; 6808 6809 return Value.getMinSignedBits() <= BitWidth; 6810} 6811 6812// \brief Given an integral type, return the next larger integral type 6813// (or a NULL type of no such type exists). 6814static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 6815 // FIXME: Int128/UInt128 support, which also needs to be introduced into 6816 // enum checking below. 6817 assert(T->isIntegralType(Context) && "Integral type required!"); 6818 const unsigned NumTypes = 4; 6819 QualType SignedIntegralTypes[NumTypes] = { 6820 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 6821 }; 6822 QualType UnsignedIntegralTypes[NumTypes] = { 6823 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 6824 Context.UnsignedLongLongTy 6825 }; 6826 6827 unsigned BitWidth = Context.getTypeSize(T); 6828 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 6829 : UnsignedIntegralTypes; 6830 for (unsigned I = 0; I != NumTypes; ++I) 6831 if (Context.getTypeSize(Types[I]) > BitWidth) 6832 return Types[I]; 6833 6834 return QualType(); 6835} 6836 6837EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 6838 EnumConstantDecl *LastEnumConst, 6839 SourceLocation IdLoc, 6840 IdentifierInfo *Id, 6841 Expr *Val) { 6842 unsigned IntWidth = Context.Target.getIntWidth(); 6843 llvm::APSInt EnumVal(IntWidth); 6844 QualType EltTy; 6845 if (Val) { 6846 if (Enum->isDependentType() || Val->isTypeDependent()) 6847 EltTy = Context.DependentTy; 6848 else { 6849 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 6850 SourceLocation ExpLoc; 6851 if (!Val->isValueDependent() && 6852 VerifyIntegerConstantExpression(Val, &EnumVal)) { 6853 Val = 0; 6854 } else { 6855 if (!getLangOptions().CPlusPlus) { 6856 // C99 6.7.2.2p2: 6857 // The expression that defines the value of an enumeration constant 6858 // shall be an integer constant expression that has a value 6859 // representable as an int. 6860 6861 // Complain if the value is not representable in an int. 6862 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 6863 Diag(IdLoc, diag::ext_enum_value_not_int) 6864 << EnumVal.toString(10) << Val->getSourceRange() 6865 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 6866 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 6867 // Force the type of the expression to 'int'. 6868 ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast); 6869 } 6870 } 6871 6872 // C++0x [dcl.enum]p5: 6873 // If the underlying type is not fixed, the type of each enumerator 6874 // is the type of its initializing value: 6875 // - If an initializer is specified for an enumerator, the 6876 // initializing value has the same type as the expression. 6877 EltTy = Val->getType(); 6878 } 6879 } 6880 } 6881 6882 if (!Val) { 6883 if (Enum->isDependentType()) 6884 EltTy = Context.DependentTy; 6885 else if (!LastEnumConst) { 6886 // C++0x [dcl.enum]p5: 6887 // If the underlying type is not fixed, the type of each enumerator 6888 // is the type of its initializing value: 6889 // - If no initializer is specified for the first enumerator, the 6890 // initializing value has an unspecified integral type. 6891 // 6892 // GCC uses 'int' for its unspecified integral type, as does 6893 // C99 6.7.2.2p3. 6894 EltTy = Context.IntTy; 6895 } else { 6896 // Assign the last value + 1. 6897 EnumVal = LastEnumConst->getInitVal(); 6898 ++EnumVal; 6899 EltTy = LastEnumConst->getType(); 6900 6901 // Check for overflow on increment. 6902 if (EnumVal < LastEnumConst->getInitVal()) { 6903 // C++0x [dcl.enum]p5: 6904 // If the underlying type is not fixed, the type of each enumerator 6905 // is the type of its initializing value: 6906 // 6907 // - Otherwise the type of the initializing value is the same as 6908 // the type of the initializing value of the preceding enumerator 6909 // unless the incremented value is not representable in that type, 6910 // in which case the type is an unspecified integral type 6911 // sufficient to contain the incremented value. If no such type 6912 // exists, the program is ill-formed. 6913 QualType T = getNextLargerIntegralType(Context, EltTy); 6914 if (T.isNull()) { 6915 // There is no integral type larger enough to represent this 6916 // value. Complain, then allow the value to wrap around. 6917 EnumVal = LastEnumConst->getInitVal(); 6918 EnumVal.zext(EnumVal.getBitWidth() * 2); 6919 Diag(IdLoc, diag::warn_enumerator_too_large) 6920 << EnumVal.toString(10); 6921 } else { 6922 EltTy = T; 6923 } 6924 6925 // Retrieve the last enumerator's value, extent that type to the 6926 // type that is supposed to be large enough to represent the incremented 6927 // value, then increment. 6928 EnumVal = LastEnumConst->getInitVal(); 6929 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6930 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 6931 ++EnumVal; 6932 6933 // If we're not in C++, diagnose the overflow of enumerator values, 6934 // which in C99 means that the enumerator value is not representable in 6935 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 6936 // permits enumerator values that are representable in some larger 6937 // integral type. 6938 if (!getLangOptions().CPlusPlus && !T.isNull()) 6939 Diag(IdLoc, diag::warn_enum_value_overflow); 6940 } else if (!getLangOptions().CPlusPlus && 6941 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 6942 // Enforce C99 6.7.2.2p2 even when we compute the next value. 6943 Diag(IdLoc, diag::ext_enum_value_not_int) 6944 << EnumVal.toString(10) << 1; 6945 } 6946 } 6947 } 6948 6949 if (!EltTy->isDependentType()) { 6950 // Make the enumerator value match the signedness and size of the 6951 // enumerator's type. 6952 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 6953 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6954 } 6955 6956 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 6957 Val, EnumVal); 6958} 6959 6960 6961Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, 6962 Decl *lastEnumConst, 6963 SourceLocation IdLoc, 6964 IdentifierInfo *Id, 6965 SourceLocation EqualLoc, ExprTy *val) { 6966 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 6967 EnumConstantDecl *LastEnumConst = 6968 cast_or_null<EnumConstantDecl>(lastEnumConst); 6969 Expr *Val = static_cast<Expr*>(val); 6970 6971 // The scope passed in may not be a decl scope. Zip up the scope tree until 6972 // we find one that is. 6973 S = getNonFieldDeclScope(S); 6974 6975 // Verify that there isn't already something declared with this name in this 6976 // scope. 6977 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 6978 ForRedeclaration); 6979 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6980 // Maybe we will complain about the shadowed template parameter. 6981 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 6982 // Just pretend that we didn't see the previous declaration. 6983 PrevDecl = 0; 6984 } 6985 6986 if (PrevDecl) { 6987 // When in C++, we may get a TagDecl with the same name; in this case the 6988 // enum constant will 'hide' the tag. 6989 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 6990 "Received TagDecl when not in C++!"); 6991 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 6992 if (isa<EnumConstantDecl>(PrevDecl)) 6993 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 6994 else 6995 Diag(IdLoc, diag::err_redefinition) << Id; 6996 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6997 return 0; 6998 } 6999 } 7000 7001 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 7002 IdLoc, Id, Val); 7003 7004 // Register this decl in the current scope stack. 7005 if (New) { 7006 New->setAccess(TheEnumDecl->getAccess()); 7007 PushOnScopeChains(New, S); 7008 } 7009 7010 return New; 7011} 7012 7013void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 7014 SourceLocation RBraceLoc, Decl *EnumDeclX, 7015 Decl **Elements, unsigned NumElements, 7016 Scope *S, AttributeList *Attr) { 7017 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 7018 QualType EnumType = Context.getTypeDeclType(Enum); 7019 7020 if (Attr) 7021 ProcessDeclAttributeList(S, Enum, Attr); 7022 7023 if (Enum->isDependentType()) { 7024 for (unsigned i = 0; i != NumElements; ++i) { 7025 EnumConstantDecl *ECD = 7026 cast_or_null<EnumConstantDecl>(Elements[i]); 7027 if (!ECD) continue; 7028 7029 ECD->setType(EnumType); 7030 } 7031 7032 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 7033 return; 7034 } 7035 7036 // TODO: If the result value doesn't fit in an int, it must be a long or long 7037 // long value. ISO C does not support this, but GCC does as an extension, 7038 // emit a warning. 7039 unsigned IntWidth = Context.Target.getIntWidth(); 7040 unsigned CharWidth = Context.Target.getCharWidth(); 7041 unsigned ShortWidth = Context.Target.getShortWidth(); 7042 7043 // Verify that all the values are okay, compute the size of the values, and 7044 // reverse the list. 7045 unsigned NumNegativeBits = 0; 7046 unsigned NumPositiveBits = 0; 7047 7048 // Keep track of whether all elements have type int. 7049 bool AllElementsInt = true; 7050 7051 for (unsigned i = 0; i != NumElements; ++i) { 7052 EnumConstantDecl *ECD = 7053 cast_or_null<EnumConstantDecl>(Elements[i]); 7054 if (!ECD) continue; // Already issued a diagnostic. 7055 7056 const llvm::APSInt &InitVal = ECD->getInitVal(); 7057 7058 // Keep track of the size of positive and negative values. 7059 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 7060 NumPositiveBits = std::max(NumPositiveBits, 7061 (unsigned)InitVal.getActiveBits()); 7062 else 7063 NumNegativeBits = std::max(NumNegativeBits, 7064 (unsigned)InitVal.getMinSignedBits()); 7065 7066 // Keep track of whether every enum element has type int (very commmon). 7067 if (AllElementsInt) 7068 AllElementsInt = ECD->getType() == Context.IntTy; 7069 } 7070 7071 // Figure out the type that should be used for this enum. 7072 // FIXME: Support -fshort-enums. 7073 QualType BestType; 7074 unsigned BestWidth; 7075 7076 // C++0x N3000 [conv.prom]p3: 7077 // An rvalue of an unscoped enumeration type whose underlying 7078 // type is not fixed can be converted to an rvalue of the first 7079 // of the following types that can represent all the values of 7080 // the enumeration: int, unsigned int, long int, unsigned long 7081 // int, long long int, or unsigned long long int. 7082 // C99 6.4.4.3p2: 7083 // An identifier declared as an enumeration constant has type int. 7084 // The C99 rule is modified by a gcc extension 7085 QualType BestPromotionType; 7086 7087 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 7088 7089 if (NumNegativeBits) { 7090 // If there is a negative value, figure out the smallest integer type (of 7091 // int/long/longlong) that fits. 7092 // If it's packed, check also if it fits a char or a short. 7093 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 7094 BestType = Context.SignedCharTy; 7095 BestWidth = CharWidth; 7096 } else if (Packed && NumNegativeBits <= ShortWidth && 7097 NumPositiveBits < ShortWidth) { 7098 BestType = Context.ShortTy; 7099 BestWidth = ShortWidth; 7100 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 7101 BestType = Context.IntTy; 7102 BestWidth = IntWidth; 7103 } else { 7104 BestWidth = Context.Target.getLongWidth(); 7105 7106 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 7107 BestType = Context.LongTy; 7108 } else { 7109 BestWidth = Context.Target.getLongLongWidth(); 7110 7111 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 7112 Diag(Enum->getLocation(), diag::warn_enum_too_large); 7113 BestType = Context.LongLongTy; 7114 } 7115 } 7116 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 7117 } else { 7118 // If there is no negative value, figure out the smallest type that fits 7119 // all of the enumerator values. 7120 // If it's packed, check also if it fits a char or a short. 7121 if (Packed && NumPositiveBits <= CharWidth) { 7122 BestType = Context.UnsignedCharTy; 7123 BestPromotionType = Context.IntTy; 7124 BestWidth = CharWidth; 7125 } else if (Packed && NumPositiveBits <= ShortWidth) { 7126 BestType = Context.UnsignedShortTy; 7127 BestPromotionType = Context.IntTy; 7128 BestWidth = ShortWidth; 7129 } else if (NumPositiveBits <= IntWidth) { 7130 BestType = Context.UnsignedIntTy; 7131 BestWidth = IntWidth; 7132 BestPromotionType 7133 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7134 ? Context.UnsignedIntTy : Context.IntTy; 7135 } else if (NumPositiveBits <= 7136 (BestWidth = Context.Target.getLongWidth())) { 7137 BestType = Context.UnsignedLongTy; 7138 BestPromotionType 7139 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7140 ? Context.UnsignedLongTy : Context.LongTy; 7141 } else { 7142 BestWidth = Context.Target.getLongLongWidth(); 7143 assert(NumPositiveBits <= BestWidth && 7144 "How could an initializer get larger than ULL?"); 7145 BestType = Context.UnsignedLongLongTy; 7146 BestPromotionType 7147 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 7148 ? Context.UnsignedLongLongTy : Context.LongLongTy; 7149 } 7150 } 7151 7152 // Loop over all of the enumerator constants, changing their types to match 7153 // the type of the enum if needed. 7154 for (unsigned i = 0; i != NumElements; ++i) { 7155 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 7156 if (!ECD) continue; // Already issued a diagnostic. 7157 7158 // Standard C says the enumerators have int type, but we allow, as an 7159 // extension, the enumerators to be larger than int size. If each 7160 // enumerator value fits in an int, type it as an int, otherwise type it the 7161 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 7162 // that X has type 'int', not 'unsigned'. 7163 7164 // Determine whether the value fits into an int. 7165 llvm::APSInt InitVal = ECD->getInitVal(); 7166 7167 // If it fits into an integer type, force it. Otherwise force it to match 7168 // the enum decl type. 7169 QualType NewTy; 7170 unsigned NewWidth; 7171 bool NewSign; 7172 if (!getLangOptions().CPlusPlus && 7173 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 7174 NewTy = Context.IntTy; 7175 NewWidth = IntWidth; 7176 NewSign = true; 7177 } else if (ECD->getType() == BestType) { 7178 // Already the right type! 7179 if (getLangOptions().CPlusPlus) 7180 // C++ [dcl.enum]p4: Following the closing brace of an 7181 // enum-specifier, each enumerator has the type of its 7182 // enumeration. 7183 ECD->setType(EnumType); 7184 continue; 7185 } else { 7186 NewTy = BestType; 7187 NewWidth = BestWidth; 7188 NewSign = BestType->isSignedIntegerType(); 7189 } 7190 7191 // Adjust the APSInt value. 7192 InitVal.extOrTrunc(NewWidth); 7193 InitVal.setIsSigned(NewSign); 7194 ECD->setInitVal(InitVal); 7195 7196 // Adjust the Expr initializer and type. 7197 if (ECD->getInitExpr()) 7198 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 7199 CK_IntegralCast, 7200 ECD->getInitExpr(), 7201 /*base paths*/ 0, 7202 VK_RValue)); 7203 if (getLangOptions().CPlusPlus) 7204 // C++ [dcl.enum]p4: Following the closing brace of an 7205 // enum-specifier, each enumerator has the type of its 7206 // enumeration. 7207 ECD->setType(EnumType); 7208 else 7209 ECD->setType(NewTy); 7210 } 7211 7212 Enum->completeDefinition(BestType, BestPromotionType, 7213 NumPositiveBits, NumNegativeBits); 7214} 7215 7216Decl *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, Expr *expr) { 7217 StringLiteral *AsmString = cast<StringLiteral>(expr); 7218 7219 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 7220 Loc, AsmString); 7221 CurContext->addDecl(New); 7222 return New; 7223} 7224 7225void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 7226 SourceLocation PragmaLoc, 7227 SourceLocation NameLoc) { 7228 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 7229 7230 if (PrevDecl) { 7231 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 7232 } else { 7233 (void)WeakUndeclaredIdentifiers.insert( 7234 std::pair<IdentifierInfo*,WeakInfo> 7235 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 7236 } 7237} 7238 7239void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 7240 IdentifierInfo* AliasName, 7241 SourceLocation PragmaLoc, 7242 SourceLocation NameLoc, 7243 SourceLocation AliasNameLoc) { 7244 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 7245 LookupOrdinaryName); 7246 WeakInfo W = WeakInfo(Name, NameLoc); 7247 7248 if (PrevDecl) { 7249 if (!PrevDecl->hasAttr<AliasAttr>()) 7250 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 7251 DeclApplyPragmaWeak(TUScope, ND, W); 7252 } else { 7253 (void)WeakUndeclaredIdentifiers.insert( 7254 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 7255 } 7256} 7257